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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
355b0502 GKH |
2 | /* binder.c |
3 | * | |
4 | * Android IPC Subsystem | |
5 | * | |
6 | * Copyright (C) 2007-2008 Google, Inc. | |
355b0502 GKH |
7 | */ |
8 | ||
9630fe88 TK |
9 | /* |
10 | * Locking overview | |
11 | * | |
12 | * There are 3 main spinlocks which must be acquired in the | |
13 | * order shown: | |
14 | * | |
15 | * 1) proc->outer_lock : protects binder_ref | |
16 | * binder_proc_lock() and binder_proc_unlock() are | |
17 | * used to acq/rel. | |
18 | * 2) node->lock : protects most fields of binder_node. | |
19 | * binder_node_lock() and binder_node_unlock() are | |
20 | * used to acq/rel | |
21 | * 3) proc->inner_lock : protects the thread and node lists | |
1b77e9dc MC |
22 | * (proc->threads, proc->waiting_threads, proc->nodes) |
23 | * and all todo lists associated with the binder_proc | |
24 | * (proc->todo, thread->todo, proc->delivered_death and | |
25 | * node->async_todo), as well as thread->transaction_stack | |
9630fe88 TK |
26 | * binder_inner_proc_lock() and binder_inner_proc_unlock() |
27 | * are used to acq/rel | |
28 | * | |
29 | * Any lock under procA must never be nested under any lock at the same | |
30 | * level or below on procB. | |
31 | * | |
32 | * Functions that require a lock held on entry indicate which lock | |
33 | * in the suffix of the function name: | |
34 | * | |
35 | * foo_olocked() : requires node->outer_lock | |
36 | * foo_nlocked() : requires node->lock | |
37 | * foo_ilocked() : requires proc->inner_lock | |
38 | * foo_oilocked(): requires proc->outer_lock and proc->inner_lock | |
39 | * foo_nilocked(): requires node->lock and proc->inner_lock | |
40 | * ... | |
41 | */ | |
42 | ||
56b468fc AS |
43 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
44 | ||
355b0502 GKH |
45 | #include <linux/fdtable.h> |
46 | #include <linux/file.h> | |
e2610b26 | 47 | #include <linux/freezer.h> |
355b0502 GKH |
48 | #include <linux/fs.h> |
49 | #include <linux/list.h> | |
50 | #include <linux/miscdevice.h> | |
355b0502 GKH |
51 | #include <linux/module.h> |
52 | #include <linux/mutex.h> | |
53 | #include <linux/nsproxy.h> | |
54 | #include <linux/poll.h> | |
16b66554 | 55 | #include <linux/debugfs.h> |
355b0502 | 56 | #include <linux/rbtree.h> |
3f07c014 | 57 | #include <linux/sched/signal.h> |
6e84f315 | 58 | #include <linux/sched/mm.h> |
5249f488 | 59 | #include <linux/seq_file.h> |
51d8a7ec | 60 | #include <linux/string.h> |
355b0502 | 61 | #include <linux/uaccess.h> |
17cf22c3 | 62 | #include <linux/pid_namespace.h> |
79af7307 | 63 | #include <linux/security.h> |
9630fe88 | 64 | #include <linux/spinlock.h> |
128f3804 | 65 | #include <linux/ratelimit.h> |
44d8047f | 66 | #include <linux/syscalls.h> |
80cd7956 | 67 | #include <linux/task_work.h> |
990be747 | 68 | #include <linux/sizes.h> |
80093619 | 69 | #include <linux/ktime.h> |
355b0502 | 70 | |
9246a4a9 | 71 | #include <uapi/linux/android/binder.h> |
f371a7c1 | 72 | |
e80ca2e9 | 73 | #include <linux/cacheflush.h> |
f371a7c1 | 74 | |
3ad20fe3 | 75 | #include "binder_internal.h" |
975a1ac9 | 76 | #include "binder_trace.h" |
355b0502 | 77 | |
c44b1231 | 78 | static HLIST_HEAD(binder_deferred_list); |
355b0502 GKH |
79 | static DEFINE_MUTEX(binder_deferred_lock); |
80 | ||
ac4812c5 | 81 | static HLIST_HEAD(binder_devices); |
355b0502 | 82 | static HLIST_HEAD(binder_procs); |
c44b1231 TK |
83 | static DEFINE_MUTEX(binder_procs_lock); |
84 | ||
355b0502 | 85 | static HLIST_HEAD(binder_dead_nodes); |
c44b1231 | 86 | static DEFINE_SPINLOCK(binder_dead_nodes_lock); |
355b0502 | 87 | |
16b66554 AH |
88 | static struct dentry *binder_debugfs_dir_entry_root; |
89 | static struct dentry *binder_debugfs_dir_entry_proc; | |
656a800a | 90 | static atomic_t binder_last_id; |
355b0502 | 91 | |
c13e0a52 YL |
92 | static int proc_show(struct seq_file *m, void *unused); |
93 | DEFINE_SHOW_ATTRIBUTE(proc); | |
355b0502 | 94 | |
355b0502 GKH |
95 | #define FORBIDDEN_MMAP_FLAGS (VM_WRITE) |
96 | ||
355b0502 GKH |
97 | enum { |
98 | BINDER_DEBUG_USER_ERROR = 1U << 0, | |
99 | BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1, | |
100 | BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2, | |
101 | BINDER_DEBUG_OPEN_CLOSE = 1U << 3, | |
102 | BINDER_DEBUG_DEAD_BINDER = 1U << 4, | |
103 | BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5, | |
104 | BINDER_DEBUG_READ_WRITE = 1U << 6, | |
105 | BINDER_DEBUG_USER_REFS = 1U << 7, | |
106 | BINDER_DEBUG_THREADS = 1U << 8, | |
107 | BINDER_DEBUG_TRANSACTION = 1U << 9, | |
108 | BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10, | |
109 | BINDER_DEBUG_FREE_BUFFER = 1U << 11, | |
110 | BINDER_DEBUG_INTERNAL_REFS = 1U << 12, | |
19c98724 | 111 | BINDER_DEBUG_PRIORITY_CAP = 1U << 13, |
9630fe88 | 112 | BINDER_DEBUG_SPINLOCKS = 1U << 14, |
355b0502 GKH |
113 | }; |
114 | static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR | | |
115 | BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION; | |
21d02ddf | 116 | module_param_named(debug_mask, binder_debug_mask, uint, 0644); |
355b0502 | 117 | |
ca2864c6 | 118 | char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES; |
ac4812c5 MC |
119 | module_param_named(devices, binder_devices_param, charp, 0444); |
120 | ||
355b0502 GKH |
121 | static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait); |
122 | static int binder_stop_on_user_error; | |
123 | ||
124 | static int binder_set_stop_on_user_error(const char *val, | |
e4dca7b7 | 125 | const struct kernel_param *kp) |
355b0502 GKH |
126 | { |
127 | int ret; | |
10f62861 | 128 | |
355b0502 GKH |
129 | ret = param_set_int(val, kp); |
130 | if (binder_stop_on_user_error < 2) | |
131 | wake_up(&binder_user_error_wait); | |
132 | return ret; | |
133 | } | |
134 | module_param_call(stop_on_user_error, binder_set_stop_on_user_error, | |
21d02ddf | 135 | param_get_int, &binder_stop_on_user_error, 0644); |
355b0502 | 136 | |
06a3494e CL |
137 | static __printf(2, 3) void binder_debug(int mask, const char *format, ...) |
138 | { | |
139 | struct va_format vaf; | |
140 | va_list args; | |
141 | ||
142 | if (binder_debug_mask & mask) { | |
143 | va_start(args, format); | |
144 | vaf.va = &args; | |
145 | vaf.fmt = format; | |
146 | pr_info_ratelimited("%pV", &vaf); | |
147 | va_end(args); | |
148 | } | |
149 | } | |
355b0502 | 150 | |
a15dac8b CL |
151 | #define binder_txn_error(x...) \ |
152 | binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, x) | |
153 | ||
06a3494e CL |
154 | static __printf(1, 2) void binder_user_error(const char *format, ...) |
155 | { | |
156 | struct va_format vaf; | |
157 | va_list args; | |
158 | ||
159 | if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) { | |
160 | va_start(args, format); | |
161 | vaf.va = &args; | |
162 | vaf.fmt = format; | |
163 | pr_info_ratelimited("%pV", &vaf); | |
164 | va_end(args); | |
165 | } | |
166 | ||
167 | if (binder_stop_on_user_error) | |
168 | binder_stop_on_user_error = 2; | |
169 | } | |
355b0502 | 170 | |
bd32889e CL |
171 | #define binder_set_extended_error(ee, _id, _command, _param) \ |
172 | do { \ | |
173 | (ee)->id = _id; \ | |
174 | (ee)->command = _command; \ | |
175 | (ee)->param = _param; \ | |
176 | } while (0) | |
177 | ||
feba3900 MC |
178 | #define to_flat_binder_object(hdr) \ |
179 | container_of(hdr, struct flat_binder_object, hdr) | |
180 | ||
181 | #define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr) | |
182 | ||
7980240b MC |
183 | #define to_binder_buffer_object(hdr) \ |
184 | container_of(hdr, struct binder_buffer_object, hdr) | |
185 | ||
def95c73 MC |
186 | #define to_binder_fd_array_object(hdr) \ |
187 | container_of(hdr, struct binder_fd_array_object, hdr) | |
188 | ||
355b0502 GKH |
189 | static struct binder_stats binder_stats; |
190 | ||
191 | static inline void binder_stats_deleted(enum binder_stat_types type) | |
192 | { | |
0953c797 | 193 | atomic_inc(&binder_stats.obj_deleted[type]); |
355b0502 GKH |
194 | } |
195 | ||
196 | static inline void binder_stats_created(enum binder_stat_types type) | |
197 | { | |
0953c797 | 198 | atomic_inc(&binder_stats.obj_created[type]); |
355b0502 GKH |
199 | } |
200 | ||
b7e241bb CL |
201 | struct binder_transaction_log_entry { |
202 | int debug_id; | |
203 | int debug_id_done; | |
204 | int call_type; | |
205 | int from_proc; | |
206 | int from_thread; | |
207 | int target_handle; | |
208 | int to_proc; | |
209 | int to_thread; | |
210 | int to_node; | |
211 | int data_size; | |
212 | int offsets_size; | |
213 | int return_error_line; | |
214 | uint32_t return_error; | |
215 | uint32_t return_error_param; | |
216 | char context_name[BINDERFS_MAX_NAME + 1]; | |
217 | }; | |
218 | ||
219 | struct binder_transaction_log { | |
220 | atomic_t cur; | |
221 | bool full; | |
222 | struct binder_transaction_log_entry entry[32]; | |
223 | }; | |
224 | ||
225 | static struct binder_transaction_log binder_transaction_log; | |
226 | static struct binder_transaction_log binder_transaction_log_failed; | |
355b0502 GKH |
227 | |
228 | static struct binder_transaction_log_entry *binder_transaction_log_add( | |
229 | struct binder_transaction_log *log) | |
230 | { | |
231 | struct binder_transaction_log_entry *e; | |
d99c7333 | 232 | unsigned int cur = atomic_inc_return(&log->cur); |
10f62861 | 233 | |
d99c7333 | 234 | if (cur >= ARRAY_SIZE(log->entry)) |
197410ad | 235 | log->full = true; |
d99c7333 TK |
236 | e = &log->entry[cur % ARRAY_SIZE(log->entry)]; |
237 | WRITE_ONCE(e->debug_id_done, 0); | |
238 | /* | |
239 | * write-barrier to synchronize access to e->debug_id_done. | |
240 | * We make sure the initialized 0 value is seen before | |
241 | * memset() other fields are zeroed by memset. | |
242 | */ | |
243 | smp_wmb(); | |
244 | memset(e, 0, sizeof(*e)); | |
355b0502 GKH |
245 | return e; |
246 | } | |
247 | ||
355b0502 | 248 | enum binder_deferred_state { |
44d8047f TK |
249 | BINDER_DEFERRED_FLUSH = 0x01, |
250 | BINDER_DEFERRED_RELEASE = 0x02, | |
355b0502 GKH |
251 | }; |
252 | ||
355b0502 GKH |
253 | enum { |
254 | BINDER_LOOPER_STATE_REGISTERED = 0x01, | |
255 | BINDER_LOOPER_STATE_ENTERED = 0x02, | |
256 | BINDER_LOOPER_STATE_EXITED = 0x04, | |
257 | BINDER_LOOPER_STATE_INVALID = 0x08, | |
258 | BINDER_LOOPER_STATE_WAITING = 0x10, | |
1b77e9dc | 259 | BINDER_LOOPER_STATE_POLL = 0x20, |
355b0502 GKH |
260 | }; |
261 | ||
9630fe88 TK |
262 | /** |
263 | * binder_proc_lock() - Acquire outer lock for given binder_proc | |
264 | * @proc: struct binder_proc to acquire | |
265 | * | |
266 | * Acquires proc->outer_lock. Used to protect binder_ref | |
267 | * structures associated with the given proc. | |
268 | */ | |
269 | #define binder_proc_lock(proc) _binder_proc_lock(proc, __LINE__) | |
270 | static void | |
271 | _binder_proc_lock(struct binder_proc *proc, int line) | |
324fa64c | 272 | __acquires(&proc->outer_lock) |
9630fe88 TK |
273 | { |
274 | binder_debug(BINDER_DEBUG_SPINLOCKS, | |
275 | "%s: line=%d\n", __func__, line); | |
276 | spin_lock(&proc->outer_lock); | |
277 | } | |
278 | ||
279 | /** | |
280 | * binder_proc_unlock() - Release spinlock for given binder_proc | |
ad228a34 | 281 | * @proc: struct binder_proc to acquire |
9630fe88 TK |
282 | * |
283 | * Release lock acquired via binder_proc_lock() | |
284 | */ | |
ad228a34 | 285 | #define binder_proc_unlock(proc) _binder_proc_unlock(proc, __LINE__) |
9630fe88 TK |
286 | static void |
287 | _binder_proc_unlock(struct binder_proc *proc, int line) | |
324fa64c | 288 | __releases(&proc->outer_lock) |
9630fe88 TK |
289 | { |
290 | binder_debug(BINDER_DEBUG_SPINLOCKS, | |
291 | "%s: line=%d\n", __func__, line); | |
292 | spin_unlock(&proc->outer_lock); | |
293 | } | |
294 | ||
295 | /** | |
296 | * binder_inner_proc_lock() - Acquire inner lock for given binder_proc | |
297 | * @proc: struct binder_proc to acquire | |
298 | * | |
299 | * Acquires proc->inner_lock. Used to protect todo lists | |
300 | */ | |
301 | #define binder_inner_proc_lock(proc) _binder_inner_proc_lock(proc, __LINE__) | |
302 | static void | |
303 | _binder_inner_proc_lock(struct binder_proc *proc, int line) | |
324fa64c | 304 | __acquires(&proc->inner_lock) |
9630fe88 TK |
305 | { |
306 | binder_debug(BINDER_DEBUG_SPINLOCKS, | |
307 | "%s: line=%d\n", __func__, line); | |
308 | spin_lock(&proc->inner_lock); | |
309 | } | |
310 | ||
311 | /** | |
312 | * binder_inner_proc_unlock() - Release inner lock for given binder_proc | |
313 | * @proc: struct binder_proc to acquire | |
314 | * | |
315 | * Release lock acquired via binder_inner_proc_lock() | |
316 | */ | |
317 | #define binder_inner_proc_unlock(proc) _binder_inner_proc_unlock(proc, __LINE__) | |
318 | static void | |
319 | _binder_inner_proc_unlock(struct binder_proc *proc, int line) | |
324fa64c | 320 | __releases(&proc->inner_lock) |
9630fe88 TK |
321 | { |
322 | binder_debug(BINDER_DEBUG_SPINLOCKS, | |
323 | "%s: line=%d\n", __func__, line); | |
324 | spin_unlock(&proc->inner_lock); | |
325 | } | |
326 | ||
327 | /** | |
328 | * binder_node_lock() - Acquire spinlock for given binder_node | |
329 | * @node: struct binder_node to acquire | |
330 | * | |
331 | * Acquires node->lock. Used to protect binder_node fields | |
332 | */ | |
333 | #define binder_node_lock(node) _binder_node_lock(node, __LINE__) | |
334 | static void | |
335 | _binder_node_lock(struct binder_node *node, int line) | |
324fa64c | 336 | __acquires(&node->lock) |
9630fe88 TK |
337 | { |
338 | binder_debug(BINDER_DEBUG_SPINLOCKS, | |
339 | "%s: line=%d\n", __func__, line); | |
340 | spin_lock(&node->lock); | |
341 | } | |
342 | ||
343 | /** | |
344 | * binder_node_unlock() - Release spinlock for given binder_proc | |
345 | * @node: struct binder_node to acquire | |
346 | * | |
347 | * Release lock acquired via binder_node_lock() | |
348 | */ | |
349 | #define binder_node_unlock(node) _binder_node_unlock(node, __LINE__) | |
350 | static void | |
351 | _binder_node_unlock(struct binder_node *node, int line) | |
324fa64c | 352 | __releases(&node->lock) |
9630fe88 TK |
353 | { |
354 | binder_debug(BINDER_DEBUG_SPINLOCKS, | |
355 | "%s: line=%d\n", __func__, line); | |
356 | spin_unlock(&node->lock); | |
357 | } | |
358 | ||
673068ee TK |
359 | /** |
360 | * binder_node_inner_lock() - Acquire node and inner locks | |
361 | * @node: struct binder_node to acquire | |
362 | * | |
363 | * Acquires node->lock. If node->proc also acquires | |
364 | * proc->inner_lock. Used to protect binder_node fields | |
365 | */ | |
366 | #define binder_node_inner_lock(node) _binder_node_inner_lock(node, __LINE__) | |
367 | static void | |
368 | _binder_node_inner_lock(struct binder_node *node, int line) | |
324fa64c | 369 | __acquires(&node->lock) __acquires(&node->proc->inner_lock) |
673068ee TK |
370 | { |
371 | binder_debug(BINDER_DEBUG_SPINLOCKS, | |
372 | "%s: line=%d\n", __func__, line); | |
373 | spin_lock(&node->lock); | |
374 | if (node->proc) | |
375 | binder_inner_proc_lock(node->proc); | |
324fa64c TK |
376 | else |
377 | /* annotation for sparse */ | |
378 | __acquire(&node->proc->inner_lock); | |
673068ee TK |
379 | } |
380 | ||
381 | /** | |
ad228a34 | 382 | * binder_node_inner_unlock() - Release node and inner locks |
673068ee TK |
383 | * @node: struct binder_node to acquire |
384 | * | |
385 | * Release lock acquired via binder_node_lock() | |
386 | */ | |
387 | #define binder_node_inner_unlock(node) _binder_node_inner_unlock(node, __LINE__) | |
388 | static void | |
389 | _binder_node_inner_unlock(struct binder_node *node, int line) | |
324fa64c | 390 | __releases(&node->lock) __releases(&node->proc->inner_lock) |
673068ee TK |
391 | { |
392 | struct binder_proc *proc = node->proc; | |
393 | ||
394 | binder_debug(BINDER_DEBUG_SPINLOCKS, | |
395 | "%s: line=%d\n", __func__, line); | |
396 | if (proc) | |
397 | binder_inner_proc_unlock(proc); | |
324fa64c TK |
398 | else |
399 | /* annotation for sparse */ | |
400 | __release(&node->proc->inner_lock); | |
673068ee TK |
401 | spin_unlock(&node->lock); |
402 | } | |
403 | ||
72196393 TK |
404 | static bool binder_worklist_empty_ilocked(struct list_head *list) |
405 | { | |
406 | return list_empty(list); | |
407 | } | |
408 | ||
409 | /** | |
410 | * binder_worklist_empty() - Check if no items on the work list | |
411 | * @proc: binder_proc associated with list | |
412 | * @list: list to check | |
413 | * | |
414 | * Return: true if there are no items on list, else false | |
415 | */ | |
416 | static bool binder_worklist_empty(struct binder_proc *proc, | |
417 | struct list_head *list) | |
418 | { | |
419 | bool ret; | |
420 | ||
421 | binder_inner_proc_lock(proc); | |
422 | ret = binder_worklist_empty_ilocked(list); | |
423 | binder_inner_proc_unlock(proc); | |
424 | return ret; | |
425 | } | |
426 | ||
148ade2c MC |
427 | /** |
428 | * binder_enqueue_work_ilocked() - Add an item to the work list | |
429 | * @work: struct binder_work to add to list | |
430 | * @target_list: list to add work to | |
431 | * | |
432 | * Adds the work to the specified list. Asserts that work | |
433 | * is not already on a list. | |
434 | * | |
435 | * Requires the proc->inner_lock to be held. | |
436 | */ | |
72196393 TK |
437 | static void |
438 | binder_enqueue_work_ilocked(struct binder_work *work, | |
439 | struct list_head *target_list) | |
440 | { | |
441 | BUG_ON(target_list == NULL); | |
442 | BUG_ON(work->entry.next && !list_empty(&work->entry)); | |
443 | list_add_tail(&work->entry, target_list); | |
444 | } | |
445 | ||
446 | /** | |
148ade2c MC |
447 | * binder_enqueue_deferred_thread_work_ilocked() - Add deferred thread work |
448 | * @thread: thread to queue work to | |
72196393 | 449 | * @work: struct binder_work to add to list |
72196393 | 450 | * |
148ade2c MC |
451 | * Adds the work to the todo list of the thread. Doesn't set the process_todo |
452 | * flag, which means that (if it wasn't already set) the thread will go to | |
453 | * sleep without handling this work when it calls read. | |
454 | * | |
455 | * Requires the proc->inner_lock to be held. | |
72196393 TK |
456 | */ |
457 | static void | |
148ade2c MC |
458 | binder_enqueue_deferred_thread_work_ilocked(struct binder_thread *thread, |
459 | struct binder_work *work) | |
72196393 | 460 | { |
44b73962 | 461 | WARN_ON(!list_empty(&thread->waiting_thread_node)); |
148ade2c MC |
462 | binder_enqueue_work_ilocked(work, &thread->todo); |
463 | } | |
464 | ||
465 | /** | |
466 | * binder_enqueue_thread_work_ilocked() - Add an item to the thread work list | |
467 | * @thread: thread to queue work to | |
468 | * @work: struct binder_work to add to list | |
469 | * | |
470 | * Adds the work to the todo list of the thread, and enables processing | |
471 | * of the todo queue. | |
472 | * | |
473 | * Requires the proc->inner_lock to be held. | |
474 | */ | |
475 | static void | |
476 | binder_enqueue_thread_work_ilocked(struct binder_thread *thread, | |
477 | struct binder_work *work) | |
478 | { | |
44b73962 | 479 | WARN_ON(!list_empty(&thread->waiting_thread_node)); |
148ade2c | 480 | binder_enqueue_work_ilocked(work, &thread->todo); |
97830f3c CL |
481 | |
482 | /* (e)poll-based threads require an explicit wakeup signal when | |
483 | * queuing their own work; they rely on these events to consume | |
484 | * messages without I/O block. Without it, threads risk waiting | |
485 | * indefinitely without handling the work. | |
486 | */ | |
487 | if (thread->looper & BINDER_LOOPER_STATE_POLL && | |
488 | thread->pid == current->pid && !thread->process_todo) | |
489 | wake_up_interruptible_sync(&thread->wait); | |
490 | ||
148ade2c MC |
491 | thread->process_todo = true; |
492 | } | |
493 | ||
494 | /** | |
495 | * binder_enqueue_thread_work() - Add an item to the thread work list | |
496 | * @thread: thread to queue work to | |
497 | * @work: struct binder_work to add to list | |
498 | * | |
499 | * Adds the work to the todo list of the thread, and enables processing | |
500 | * of the todo queue. | |
501 | */ | |
502 | static void | |
503 | binder_enqueue_thread_work(struct binder_thread *thread, | |
504 | struct binder_work *work) | |
505 | { | |
506 | binder_inner_proc_lock(thread->proc); | |
507 | binder_enqueue_thread_work_ilocked(thread, work); | |
508 | binder_inner_proc_unlock(thread->proc); | |
72196393 TK |
509 | } |
510 | ||
511 | static void | |
512 | binder_dequeue_work_ilocked(struct binder_work *work) | |
513 | { | |
514 | list_del_init(&work->entry); | |
515 | } | |
516 | ||
517 | /** | |
518 | * binder_dequeue_work() - Removes an item from the work list | |
519 | * @proc: binder_proc associated with list | |
520 | * @work: struct binder_work to remove from list | |
521 | * | |
522 | * Removes the specified work item from whatever list it is on. | |
523 | * Can safely be called if work is not on any list. | |
524 | */ | |
525 | static void | |
526 | binder_dequeue_work(struct binder_proc *proc, struct binder_work *work) | |
527 | { | |
528 | binder_inner_proc_lock(proc); | |
529 | binder_dequeue_work_ilocked(work); | |
530 | binder_inner_proc_unlock(proc); | |
531 | } | |
532 | ||
533 | static struct binder_work *binder_dequeue_work_head_ilocked( | |
534 | struct list_head *list) | |
535 | { | |
536 | struct binder_work *w; | |
537 | ||
538 | w = list_first_entry_or_null(list, struct binder_work, entry); | |
539 | if (w) | |
540 | list_del_init(&w->entry); | |
541 | return w; | |
542 | } | |
543 | ||
355b0502 GKH |
544 | static void |
545 | binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer); | |
7a4408c6 TK |
546 | static void binder_free_thread(struct binder_thread *thread); |
547 | static void binder_free_proc(struct binder_proc *proc); | |
da0fa9e4 | 548 | static void binder_inc_node_tmpref_ilocked(struct binder_node *node); |
355b0502 | 549 | |
1b77e9dc MC |
550 | static bool binder_has_work_ilocked(struct binder_thread *thread, |
551 | bool do_proc_work) | |
552 | { | |
148ade2c | 553 | return thread->process_todo || |
1b77e9dc MC |
554 | thread->looper_need_return || |
555 | (do_proc_work && | |
556 | !binder_worklist_empty_ilocked(&thread->proc->todo)); | |
557 | } | |
558 | ||
559 | static bool binder_has_work(struct binder_thread *thread, bool do_proc_work) | |
560 | { | |
561 | bool has_work; | |
562 | ||
563 | binder_inner_proc_lock(thread->proc); | |
564 | has_work = binder_has_work_ilocked(thread, do_proc_work); | |
565 | binder_inner_proc_unlock(thread->proc); | |
566 | ||
567 | return has_work; | |
568 | } | |
569 | ||
570 | static bool binder_available_for_proc_work_ilocked(struct binder_thread *thread) | |
571 | { | |
572 | return !thread->transaction_stack && | |
573 | binder_worklist_empty_ilocked(&thread->todo) && | |
574 | (thread->looper & (BINDER_LOOPER_STATE_ENTERED | | |
575 | BINDER_LOOPER_STATE_REGISTERED)); | |
576 | } | |
577 | ||
578 | static void binder_wakeup_poll_threads_ilocked(struct binder_proc *proc, | |
579 | bool sync) | |
580 | { | |
581 | struct rb_node *n; | |
582 | struct binder_thread *thread; | |
583 | ||
584 | for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) { | |
585 | thread = rb_entry(n, struct binder_thread, rb_node); | |
586 | if (thread->looper & BINDER_LOOPER_STATE_POLL && | |
587 | binder_available_for_proc_work_ilocked(thread)) { | |
588 | if (sync) | |
589 | wake_up_interruptible_sync(&thread->wait); | |
590 | else | |
591 | wake_up_interruptible(&thread->wait); | |
592 | } | |
593 | } | |
594 | } | |
595 | ||
408c68b1 MC |
596 | /** |
597 | * binder_select_thread_ilocked() - selects a thread for doing proc work. | |
598 | * @proc: process to select a thread from | |
599 | * | |
600 | * Note that calling this function moves the thread off the waiting_threads | |
601 | * list, so it can only be woken up by the caller of this function, or a | |
602 | * signal. Therefore, callers *should* always wake up the thread this function | |
603 | * returns. | |
604 | * | |
605 | * Return: If there's a thread currently waiting for process work, | |
606 | * returns that thread. Otherwise returns NULL. | |
607 | */ | |
608 | static struct binder_thread * | |
609 | binder_select_thread_ilocked(struct binder_proc *proc) | |
1b77e9dc MC |
610 | { |
611 | struct binder_thread *thread; | |
612 | ||
858b2719 | 613 | assert_spin_locked(&proc->inner_lock); |
1b77e9dc MC |
614 | thread = list_first_entry_or_null(&proc->waiting_threads, |
615 | struct binder_thread, | |
616 | waiting_thread_node); | |
617 | ||
408c68b1 | 618 | if (thread) |
1b77e9dc | 619 | list_del_init(&thread->waiting_thread_node); |
408c68b1 MC |
620 | |
621 | return thread; | |
622 | } | |
623 | ||
624 | /** | |
625 | * binder_wakeup_thread_ilocked() - wakes up a thread for doing proc work. | |
626 | * @proc: process to wake up a thread in | |
627 | * @thread: specific thread to wake-up (may be NULL) | |
628 | * @sync: whether to do a synchronous wake-up | |
629 | * | |
630 | * This function wakes up a thread in the @proc process. | |
631 | * The caller may provide a specific thread to wake-up in | |
632 | * the @thread parameter. If @thread is NULL, this function | |
633 | * will wake up threads that have called poll(). | |
634 | * | |
635 | * Note that for this function to work as expected, callers | |
636 | * should first call binder_select_thread() to find a thread | |
637 | * to handle the work (if they don't have a thread already), | |
638 | * and pass the result into the @thread parameter. | |
639 | */ | |
640 | static void binder_wakeup_thread_ilocked(struct binder_proc *proc, | |
641 | struct binder_thread *thread, | |
642 | bool sync) | |
643 | { | |
858b2719 | 644 | assert_spin_locked(&proc->inner_lock); |
408c68b1 MC |
645 | |
646 | if (thread) { | |
1b77e9dc MC |
647 | if (sync) |
648 | wake_up_interruptible_sync(&thread->wait); | |
649 | else | |
650 | wake_up_interruptible(&thread->wait); | |
651 | return; | |
652 | } | |
653 | ||
654 | /* Didn't find a thread waiting for proc work; this can happen | |
655 | * in two scenarios: | |
656 | * 1. All threads are busy handling transactions | |
657 | * In that case, one of those threads should call back into | |
658 | * the kernel driver soon and pick up this work. | |
659 | * 2. Threads are using the (e)poll interface, in which case | |
660 | * they may be blocked on the waitqueue without having been | |
661 | * added to waiting_threads. For this case, we just iterate | |
662 | * over all threads not handling transaction work, and | |
663 | * wake them all up. We wake all because we don't know whether | |
664 | * a thread that called into (e)poll is handling non-binder | |
665 | * work currently. | |
666 | */ | |
667 | binder_wakeup_poll_threads_ilocked(proc, sync); | |
668 | } | |
669 | ||
408c68b1 MC |
670 | static void binder_wakeup_proc_ilocked(struct binder_proc *proc) |
671 | { | |
672 | struct binder_thread *thread = binder_select_thread_ilocked(proc); | |
673 | ||
674 | binder_wakeup_thread_ilocked(proc, thread, /* sync = */false); | |
675 | } | |
676 | ||
355b0502 GKH |
677 | static void binder_set_nice(long nice) |
678 | { | |
679 | long min_nice; | |
10f62861 | 680 | |
355b0502 GKH |
681 | if (can_nice(current, nice)) { |
682 | set_user_nice(current, nice); | |
683 | return; | |
684 | } | |
c3643b69 | 685 | min_nice = rlimit_to_nice(rlimit(RLIMIT_NICE)); |
355b0502 | 686 | binder_debug(BINDER_DEBUG_PRIORITY_CAP, |
56b468fc AS |
687 | "%d: nice value %ld not allowed use %ld instead\n", |
688 | current->pid, nice, min_nice); | |
355b0502 | 689 | set_user_nice(current, min_nice); |
8698a745 | 690 | if (min_nice <= MAX_NICE) |
355b0502 | 691 | return; |
56b468fc | 692 | binder_user_error("%d RLIMIT_NICE not set\n", current->pid); |
355b0502 GKH |
693 | } |
694 | ||
da0fa9e4 TK |
695 | static struct binder_node *binder_get_node_ilocked(struct binder_proc *proc, |
696 | binder_uintptr_t ptr) | |
355b0502 GKH |
697 | { |
698 | struct rb_node *n = proc->nodes.rb_node; | |
699 | struct binder_node *node; | |
700 | ||
858b2719 | 701 | assert_spin_locked(&proc->inner_lock); |
da0fa9e4 | 702 | |
355b0502 GKH |
703 | while (n) { |
704 | node = rb_entry(n, struct binder_node, rb_node); | |
705 | ||
706 | if (ptr < node->ptr) | |
707 | n = n->rb_left; | |
708 | else if (ptr > node->ptr) | |
709 | n = n->rb_right; | |
adc18842 TK |
710 | else { |
711 | /* | |
712 | * take an implicit weak reference | |
713 | * to ensure node stays alive until | |
714 | * call to binder_put_node() | |
715 | */ | |
da0fa9e4 | 716 | binder_inc_node_tmpref_ilocked(node); |
355b0502 | 717 | return node; |
adc18842 | 718 | } |
355b0502 GKH |
719 | } |
720 | return NULL; | |
721 | } | |
722 | ||
da0fa9e4 TK |
723 | static struct binder_node *binder_get_node(struct binder_proc *proc, |
724 | binder_uintptr_t ptr) | |
725 | { | |
726 | struct binder_node *node; | |
727 | ||
728 | binder_inner_proc_lock(proc); | |
729 | node = binder_get_node_ilocked(proc, ptr); | |
730 | binder_inner_proc_unlock(proc); | |
731 | return node; | |
732 | } | |
733 | ||
734 | static struct binder_node *binder_init_node_ilocked( | |
735 | struct binder_proc *proc, | |
736 | struct binder_node *new_node, | |
737 | struct flat_binder_object *fp) | |
355b0502 GKH |
738 | { |
739 | struct rb_node **p = &proc->nodes.rb_node; | |
740 | struct rb_node *parent = NULL; | |
741 | struct binder_node *node; | |
673068ee TK |
742 | binder_uintptr_t ptr = fp ? fp->binder : 0; |
743 | binder_uintptr_t cookie = fp ? fp->cookie : 0; | |
744 | __u32 flags = fp ? fp->flags : 0; | |
355b0502 | 745 | |
858b2719 MC |
746 | assert_spin_locked(&proc->inner_lock); |
747 | ||
355b0502 | 748 | while (*p) { |
da0fa9e4 | 749 | |
355b0502 GKH |
750 | parent = *p; |
751 | node = rb_entry(parent, struct binder_node, rb_node); | |
752 | ||
753 | if (ptr < node->ptr) | |
754 | p = &(*p)->rb_left; | |
755 | else if (ptr > node->ptr) | |
756 | p = &(*p)->rb_right; | |
da0fa9e4 TK |
757 | else { |
758 | /* | |
759 | * A matching node is already in | |
760 | * the rb tree. Abandon the init | |
761 | * and return it. | |
762 | */ | |
763 | binder_inc_node_tmpref_ilocked(node); | |
764 | return node; | |
765 | } | |
355b0502 | 766 | } |
da0fa9e4 | 767 | node = new_node; |
355b0502 | 768 | binder_stats_created(BINDER_STAT_NODE); |
adc18842 | 769 | node->tmp_refs++; |
355b0502 GKH |
770 | rb_link_node(&node->rb_node, parent, p); |
771 | rb_insert_color(&node->rb_node, &proc->nodes); | |
656a800a | 772 | node->debug_id = atomic_inc_return(&binder_last_id); |
355b0502 GKH |
773 | node->proc = proc; |
774 | node->ptr = ptr; | |
775 | node->cookie = cookie; | |
776 | node->work.type = BINDER_WORK_NODE; | |
673068ee TK |
777 | node->min_priority = flags & FLAT_BINDER_FLAG_PRIORITY_MASK; |
778 | node->accept_fds = !!(flags & FLAT_BINDER_FLAG_ACCEPTS_FDS); | |
ec74136d | 779 | node->txn_security_ctx = !!(flags & FLAT_BINDER_FLAG_TXN_SECURITY_CTX); |
9630fe88 | 780 | spin_lock_init(&node->lock); |
355b0502 GKH |
781 | INIT_LIST_HEAD(&node->work.entry); |
782 | INIT_LIST_HEAD(&node->async_todo); | |
783 | binder_debug(BINDER_DEBUG_INTERNAL_REFS, | |
da49889d | 784 | "%d:%d node %d u%016llx c%016llx created\n", |
355b0502 | 785 | proc->pid, current->pid, node->debug_id, |
da49889d | 786 | (u64)node->ptr, (u64)node->cookie); |
da0fa9e4 TK |
787 | |
788 | return node; | |
789 | } | |
790 | ||
791 | static struct binder_node *binder_new_node(struct binder_proc *proc, | |
792 | struct flat_binder_object *fp) | |
793 | { | |
794 | struct binder_node *node; | |
795 | struct binder_node *new_node = kzalloc(sizeof(*node), GFP_KERNEL); | |
796 | ||
797 | if (!new_node) | |
798 | return NULL; | |
799 | binder_inner_proc_lock(proc); | |
800 | node = binder_init_node_ilocked(proc, new_node, fp); | |
801 | binder_inner_proc_unlock(proc); | |
802 | if (node != new_node) | |
803 | /* | |
804 | * The node was already added by another thread | |
805 | */ | |
806 | kfree(new_node); | |
807 | ||
355b0502 GKH |
808 | return node; |
809 | } | |
810 | ||
ed29721e | 811 | static void binder_free_node(struct binder_node *node) |
355b0502 | 812 | { |
ed29721e TK |
813 | kfree(node); |
814 | binder_stats_deleted(BINDER_STAT_NODE); | |
815 | } | |
816 | ||
673068ee TK |
817 | static int binder_inc_node_nilocked(struct binder_node *node, int strong, |
818 | int internal, | |
819 | struct list_head *target_list) | |
ed29721e | 820 | { |
673068ee TK |
821 | struct binder_proc *proc = node->proc; |
822 | ||
858b2719 | 823 | assert_spin_locked(&node->lock); |
673068ee | 824 | if (proc) |
858b2719 | 825 | assert_spin_locked(&proc->inner_lock); |
355b0502 GKH |
826 | if (strong) { |
827 | if (internal) { | |
828 | if (target_list == NULL && | |
829 | node->internal_strong_refs == 0 && | |
342e5c90 MC |
830 | !(node->proc && |
831 | node == node->proc->context->binder_context_mgr_node && | |
832 | node->has_strong_ref)) { | |
56b468fc AS |
833 | pr_err("invalid inc strong node for %d\n", |
834 | node->debug_id); | |
355b0502 GKH |
835 | return -EINVAL; |
836 | } | |
837 | node->internal_strong_refs++; | |
838 | } else | |
839 | node->local_strong_refs++; | |
840 | if (!node->has_strong_ref && target_list) { | |
44b73962 SY |
841 | struct binder_thread *thread = container_of(target_list, |
842 | struct binder_thread, todo); | |
72196393 | 843 | binder_dequeue_work_ilocked(&node->work); |
44b73962 SY |
844 | BUG_ON(&thread->todo != target_list); |
845 | binder_enqueue_deferred_thread_work_ilocked(thread, | |
846 | &node->work); | |
355b0502 GKH |
847 | } |
848 | } else { | |
849 | if (!internal) | |
850 | node->local_weak_refs++; | |
851 | if (!node->has_weak_ref && list_empty(&node->work.entry)) { | |
852 | if (target_list == NULL) { | |
56b468fc AS |
853 | pr_err("invalid inc weak node for %d\n", |
854 | node->debug_id); | |
355b0502 GKH |
855 | return -EINVAL; |
856 | } | |
148ade2c MC |
857 | /* |
858 | * See comment above | |
859 | */ | |
72196393 | 860 | binder_enqueue_work_ilocked(&node->work, target_list); |
355b0502 GKH |
861 | } |
862 | } | |
863 | return 0; | |
864 | } | |
865 | ||
ed29721e TK |
866 | static int binder_inc_node(struct binder_node *node, int strong, int internal, |
867 | struct list_head *target_list) | |
868 | { | |
869 | int ret; | |
870 | ||
673068ee TK |
871 | binder_node_inner_lock(node); |
872 | ret = binder_inc_node_nilocked(node, strong, internal, target_list); | |
873 | binder_node_inner_unlock(node); | |
ed29721e TK |
874 | |
875 | return ret; | |
876 | } | |
877 | ||
673068ee TK |
878 | static bool binder_dec_node_nilocked(struct binder_node *node, |
879 | int strong, int internal) | |
355b0502 | 880 | { |
ed29721e TK |
881 | struct binder_proc *proc = node->proc; |
882 | ||
858b2719 | 883 | assert_spin_locked(&node->lock); |
ed29721e | 884 | if (proc) |
858b2719 | 885 | assert_spin_locked(&proc->inner_lock); |
355b0502 GKH |
886 | if (strong) { |
887 | if (internal) | |
888 | node->internal_strong_refs--; | |
889 | else | |
890 | node->local_strong_refs--; | |
891 | if (node->local_strong_refs || node->internal_strong_refs) | |
ed29721e | 892 | return false; |
355b0502 GKH |
893 | } else { |
894 | if (!internal) | |
895 | node->local_weak_refs--; | |
adc18842 TK |
896 | if (node->local_weak_refs || node->tmp_refs || |
897 | !hlist_empty(&node->refs)) | |
ed29721e | 898 | return false; |
355b0502 | 899 | } |
ed29721e TK |
900 | |
901 | if (proc && (node->has_strong_ref || node->has_weak_ref)) { | |
355b0502 | 902 | if (list_empty(&node->work.entry)) { |
72196393 | 903 | binder_enqueue_work_ilocked(&node->work, &proc->todo); |
408c68b1 | 904 | binder_wakeup_proc_ilocked(proc); |
355b0502 GKH |
905 | } |
906 | } else { | |
907 | if (hlist_empty(&node->refs) && !node->local_strong_refs && | |
adc18842 | 908 | !node->local_weak_refs && !node->tmp_refs) { |
ed29721e | 909 | if (proc) { |
72196393 TK |
910 | binder_dequeue_work_ilocked(&node->work); |
911 | rb_erase(&node->rb_node, &proc->nodes); | |
355b0502 | 912 | binder_debug(BINDER_DEBUG_INTERNAL_REFS, |
56b468fc | 913 | "refless node %d deleted\n", |
355b0502 GKH |
914 | node->debug_id); |
915 | } else { | |
72196393 | 916 | BUG_ON(!list_empty(&node->work.entry)); |
c44b1231 | 917 | spin_lock(&binder_dead_nodes_lock); |
ed29721e TK |
918 | /* |
919 | * tmp_refs could have changed so | |
920 | * check it again | |
921 | */ | |
922 | if (node->tmp_refs) { | |
923 | spin_unlock(&binder_dead_nodes_lock); | |
924 | return false; | |
925 | } | |
355b0502 | 926 | hlist_del(&node->dead_node); |
c44b1231 | 927 | spin_unlock(&binder_dead_nodes_lock); |
355b0502 | 928 | binder_debug(BINDER_DEBUG_INTERNAL_REFS, |
56b468fc | 929 | "dead node %d deleted\n", |
355b0502 GKH |
930 | node->debug_id); |
931 | } | |
ed29721e | 932 | return true; |
355b0502 GKH |
933 | } |
934 | } | |
ed29721e TK |
935 | return false; |
936 | } | |
355b0502 | 937 | |
ed29721e TK |
938 | static void binder_dec_node(struct binder_node *node, int strong, int internal) |
939 | { | |
940 | bool free_node; | |
941 | ||
673068ee TK |
942 | binder_node_inner_lock(node); |
943 | free_node = binder_dec_node_nilocked(node, strong, internal); | |
944 | binder_node_inner_unlock(node); | |
ed29721e TK |
945 | if (free_node) |
946 | binder_free_node(node); | |
947 | } | |
948 | ||
949 | static void binder_inc_node_tmpref_ilocked(struct binder_node *node) | |
950 | { | |
951 | /* | |
952 | * No call to binder_inc_node() is needed since we | |
953 | * don't need to inform userspace of any changes to | |
954 | * tmp_refs | |
955 | */ | |
956 | node->tmp_refs++; | |
355b0502 GKH |
957 | } |
958 | ||
adc18842 TK |
959 | /** |
960 | * binder_inc_node_tmpref() - take a temporary reference on node | |
961 | * @node: node to reference | |
962 | * | |
963 | * Take reference on node to prevent the node from being freed | |
ed29721e TK |
964 | * while referenced only by a local variable. The inner lock is |
965 | * needed to serialize with the node work on the queue (which | |
966 | * isn't needed after the node is dead). If the node is dead | |
967 | * (node->proc is NULL), use binder_dead_nodes_lock to protect | |
968 | * node->tmp_refs against dead-node-only cases where the node | |
969 | * lock cannot be acquired (eg traversing the dead node list to | |
970 | * print nodes) | |
adc18842 TK |
971 | */ |
972 | static void binder_inc_node_tmpref(struct binder_node *node) | |
973 | { | |
673068ee | 974 | binder_node_lock(node); |
ed29721e TK |
975 | if (node->proc) |
976 | binder_inner_proc_lock(node->proc); | |
977 | else | |
978 | spin_lock(&binder_dead_nodes_lock); | |
979 | binder_inc_node_tmpref_ilocked(node); | |
980 | if (node->proc) | |
981 | binder_inner_proc_unlock(node->proc); | |
982 | else | |
983 | spin_unlock(&binder_dead_nodes_lock); | |
673068ee | 984 | binder_node_unlock(node); |
adc18842 TK |
985 | } |
986 | ||
987 | /** | |
988 | * binder_dec_node_tmpref() - remove a temporary reference on node | |
989 | * @node: node to reference | |
990 | * | |
991 | * Release temporary reference on node taken via binder_inc_node_tmpref() | |
992 | */ | |
993 | static void binder_dec_node_tmpref(struct binder_node *node) | |
994 | { | |
ed29721e TK |
995 | bool free_node; |
996 | ||
673068ee TK |
997 | binder_node_inner_lock(node); |
998 | if (!node->proc) | |
ed29721e | 999 | spin_lock(&binder_dead_nodes_lock); |
324fa64c TK |
1000 | else |
1001 | __acquire(&binder_dead_nodes_lock); | |
adc18842 TK |
1002 | node->tmp_refs--; |
1003 | BUG_ON(node->tmp_refs < 0); | |
ed29721e TK |
1004 | if (!node->proc) |
1005 | spin_unlock(&binder_dead_nodes_lock); | |
324fa64c TK |
1006 | else |
1007 | __release(&binder_dead_nodes_lock); | |
adc18842 TK |
1008 | /* |
1009 | * Call binder_dec_node() to check if all refcounts are 0 | |
1010 | * and cleanup is needed. Calling with strong=0 and internal=1 | |
1011 | * causes no actual reference to be released in binder_dec_node(). | |
1012 | * If that changes, a change is needed here too. | |
1013 | */ | |
673068ee TK |
1014 | free_node = binder_dec_node_nilocked(node, 0, 1); |
1015 | binder_node_inner_unlock(node); | |
ed29721e TK |
1016 | if (free_node) |
1017 | binder_free_node(node); | |
adc18842 TK |
1018 | } |
1019 | ||
1020 | static void binder_put_node(struct binder_node *node) | |
1021 | { | |
1022 | binder_dec_node_tmpref(node); | |
1023 | } | |
355b0502 | 1024 | |
2c1838dc TK |
1025 | static struct binder_ref *binder_get_ref_olocked(struct binder_proc *proc, |
1026 | u32 desc, bool need_strong_ref) | |
355b0502 GKH |
1027 | { |
1028 | struct rb_node *n = proc->refs_by_desc.rb_node; | |
1029 | struct binder_ref *ref; | |
1030 | ||
1031 | while (n) { | |
1032 | ref = rb_entry(n, struct binder_ref, rb_node_desc); | |
1033 | ||
372e3147 | 1034 | if (desc < ref->data.desc) { |
355b0502 | 1035 | n = n->rb_left; |
372e3147 | 1036 | } else if (desc > ref->data.desc) { |
355b0502 | 1037 | n = n->rb_right; |
372e3147 | 1038 | } else if (need_strong_ref && !ref->data.strong) { |
0a3ffab9 AH |
1039 | binder_user_error("tried to use weak ref as strong ref\n"); |
1040 | return NULL; | |
1041 | } else { | |
355b0502 | 1042 | return ref; |
0a3ffab9 | 1043 | } |
355b0502 GKH |
1044 | } |
1045 | return NULL; | |
1046 | } | |
1047 | ||
372e3147 | 1048 | /** |
2c1838dc | 1049 | * binder_get_ref_for_node_olocked() - get the ref associated with given node |
372e3147 TK |
1050 | * @proc: binder_proc that owns the ref |
1051 | * @node: binder_node of target | |
1052 | * @new_ref: newly allocated binder_ref to be initialized or %NULL | |
1053 | * | |
1054 | * Look up the ref for the given node and return it if it exists | |
1055 | * | |
1056 | * If it doesn't exist and the caller provides a newly allocated | |
1057 | * ref, initialize the fields of the newly allocated ref and insert | |
1058 | * into the given proc rb_trees and node refs list. | |
1059 | * | |
1060 | * Return: the ref for node. It is possible that another thread | |
1061 | * allocated/initialized the ref first in which case the | |
1062 | * returned ref would be different than the passed-in | |
1063 | * new_ref. new_ref must be kfree'd by the caller in | |
1064 | * this case. | |
1065 | */ | |
2c1838dc TK |
1066 | static struct binder_ref *binder_get_ref_for_node_olocked( |
1067 | struct binder_proc *proc, | |
1068 | struct binder_node *node, | |
1069 | struct binder_ref *new_ref) | |
355b0502 | 1070 | { |
372e3147 | 1071 | struct binder_context *context = proc->context; |
355b0502 GKH |
1072 | struct rb_node **p = &proc->refs_by_node.rb_node; |
1073 | struct rb_node *parent = NULL; | |
372e3147 TK |
1074 | struct binder_ref *ref; |
1075 | struct rb_node *n; | |
355b0502 GKH |
1076 | |
1077 | while (*p) { | |
1078 | parent = *p; | |
1079 | ref = rb_entry(parent, struct binder_ref, rb_node_node); | |
1080 | ||
1081 | if (node < ref->node) | |
1082 | p = &(*p)->rb_left; | |
1083 | else if (node > ref->node) | |
1084 | p = &(*p)->rb_right; | |
1085 | else | |
1086 | return ref; | |
1087 | } | |
372e3147 | 1088 | if (!new_ref) |
355b0502 | 1089 | return NULL; |
372e3147 | 1090 | |
355b0502 | 1091 | binder_stats_created(BINDER_STAT_REF); |
372e3147 | 1092 | new_ref->data.debug_id = atomic_inc_return(&binder_last_id); |
355b0502 GKH |
1093 | new_ref->proc = proc; |
1094 | new_ref->node = node; | |
1095 | rb_link_node(&new_ref->rb_node_node, parent, p); | |
1096 | rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node); | |
1097 | ||
372e3147 | 1098 | new_ref->data.desc = (node == context->binder_context_mgr_node) ? 0 : 1; |
355b0502 GKH |
1099 | for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) { |
1100 | ref = rb_entry(n, struct binder_ref, rb_node_desc); | |
372e3147 | 1101 | if (ref->data.desc > new_ref->data.desc) |
355b0502 | 1102 | break; |
372e3147 | 1103 | new_ref->data.desc = ref->data.desc + 1; |
355b0502 GKH |
1104 | } |
1105 | ||
1106 | p = &proc->refs_by_desc.rb_node; | |
1107 | while (*p) { | |
1108 | parent = *p; | |
1109 | ref = rb_entry(parent, struct binder_ref, rb_node_desc); | |
1110 | ||
372e3147 | 1111 | if (new_ref->data.desc < ref->data.desc) |
355b0502 | 1112 | p = &(*p)->rb_left; |
372e3147 | 1113 | else if (new_ref->data.desc > ref->data.desc) |
355b0502 GKH |
1114 | p = &(*p)->rb_right; |
1115 | else | |
1116 | BUG(); | |
1117 | } | |
1118 | rb_link_node(&new_ref->rb_node_desc, parent, p); | |
1119 | rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc); | |
673068ee TK |
1120 | |
1121 | binder_node_lock(node); | |
e4cffcf4 | 1122 | hlist_add_head(&new_ref->node_entry, &node->refs); |
355b0502 | 1123 | |
e4cffcf4 TK |
1124 | binder_debug(BINDER_DEBUG_INTERNAL_REFS, |
1125 | "%d new ref %d desc %d for node %d\n", | |
372e3147 | 1126 | proc->pid, new_ref->data.debug_id, new_ref->data.desc, |
e4cffcf4 | 1127 | node->debug_id); |
673068ee | 1128 | binder_node_unlock(node); |
355b0502 GKH |
1129 | return new_ref; |
1130 | } | |
1131 | ||
2c1838dc | 1132 | static void binder_cleanup_ref_olocked(struct binder_ref *ref) |
355b0502 | 1133 | { |
ed29721e | 1134 | bool delete_node = false; |
ed29721e | 1135 | |
355b0502 | 1136 | binder_debug(BINDER_DEBUG_INTERNAL_REFS, |
56b468fc | 1137 | "%d delete ref %d desc %d for node %d\n", |
372e3147 | 1138 | ref->proc->pid, ref->data.debug_id, ref->data.desc, |
56b468fc | 1139 | ref->node->debug_id); |
355b0502 GKH |
1140 | |
1141 | rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc); | |
1142 | rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node); | |
372e3147 | 1143 | |
673068ee | 1144 | binder_node_inner_lock(ref->node); |
372e3147 | 1145 | if (ref->data.strong) |
673068ee | 1146 | binder_dec_node_nilocked(ref->node, 1, 1); |
372e3147 | 1147 | |
355b0502 | 1148 | hlist_del(&ref->node_entry); |
673068ee TK |
1149 | delete_node = binder_dec_node_nilocked(ref->node, 0, 1); |
1150 | binder_node_inner_unlock(ref->node); | |
ed29721e TK |
1151 | /* |
1152 | * Clear ref->node unless we want the caller to free the node | |
1153 | */ | |
1154 | if (!delete_node) { | |
1155 | /* | |
1156 | * The caller uses ref->node to determine | |
1157 | * whether the node needs to be freed. Clear | |
1158 | * it since the node is still alive. | |
1159 | */ | |
1160 | ref->node = NULL; | |
1161 | } | |
372e3147 | 1162 | |
355b0502 GKH |
1163 | if (ref->death) { |
1164 | binder_debug(BINDER_DEBUG_DEAD_BINDER, | |
56b468fc | 1165 | "%d delete ref %d desc %d has death notification\n", |
372e3147 TK |
1166 | ref->proc->pid, ref->data.debug_id, |
1167 | ref->data.desc); | |
72196393 | 1168 | binder_dequeue_work(ref->proc, &ref->death->work); |
355b0502 GKH |
1169 | binder_stats_deleted(BINDER_STAT_DEATH); |
1170 | } | |
355b0502 GKH |
1171 | binder_stats_deleted(BINDER_STAT_REF); |
1172 | } | |
1173 | ||
372e3147 | 1174 | /** |
2c1838dc | 1175 | * binder_inc_ref_olocked() - increment the ref for given handle |
372e3147 TK |
1176 | * @ref: ref to be incremented |
1177 | * @strong: if true, strong increment, else weak | |
1178 | * @target_list: list to queue node work on | |
1179 | * | |
2c1838dc | 1180 | * Increment the ref. @ref->proc->outer_lock must be held on entry |
372e3147 TK |
1181 | * |
1182 | * Return: 0, if successful, else errno | |
1183 | */ | |
2c1838dc TK |
1184 | static int binder_inc_ref_olocked(struct binder_ref *ref, int strong, |
1185 | struct list_head *target_list) | |
355b0502 GKH |
1186 | { |
1187 | int ret; | |
10f62861 | 1188 | |
355b0502 | 1189 | if (strong) { |
372e3147 | 1190 | if (ref->data.strong == 0) { |
355b0502 GKH |
1191 | ret = binder_inc_node(ref->node, 1, 1, target_list); |
1192 | if (ret) | |
1193 | return ret; | |
1194 | } | |
372e3147 | 1195 | ref->data.strong++; |
355b0502 | 1196 | } else { |
372e3147 | 1197 | if (ref->data.weak == 0) { |
355b0502 GKH |
1198 | ret = binder_inc_node(ref->node, 0, 1, target_list); |
1199 | if (ret) | |
1200 | return ret; | |
1201 | } | |
372e3147 | 1202 | ref->data.weak++; |
355b0502 GKH |
1203 | } |
1204 | return 0; | |
1205 | } | |
1206 | ||
372e3147 | 1207 | /** |
ad228a34 | 1208 | * binder_dec_ref_olocked() - dec the ref for given handle |
372e3147 TK |
1209 | * @ref: ref to be decremented |
1210 | * @strong: if true, strong decrement, else weak | |
1211 | * | |
1212 | * Decrement the ref. | |
1213 | * | |
ad228a34 | 1214 | * Return: %true if ref is cleaned up and ready to be freed. |
372e3147 | 1215 | */ |
2c1838dc | 1216 | static bool binder_dec_ref_olocked(struct binder_ref *ref, int strong) |
355b0502 GKH |
1217 | { |
1218 | if (strong) { | |
372e3147 | 1219 | if (ref->data.strong == 0) { |
56b468fc | 1220 | binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n", |
372e3147 TK |
1221 | ref->proc->pid, ref->data.debug_id, |
1222 | ref->data.desc, ref->data.strong, | |
1223 | ref->data.weak); | |
1224 | return false; | |
355b0502 | 1225 | } |
372e3147 | 1226 | ref->data.strong--; |
ed29721e TK |
1227 | if (ref->data.strong == 0) |
1228 | binder_dec_node(ref->node, strong, 1); | |
355b0502 | 1229 | } else { |
372e3147 | 1230 | if (ref->data.weak == 0) { |
56b468fc | 1231 | binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n", |
372e3147 TK |
1232 | ref->proc->pid, ref->data.debug_id, |
1233 | ref->data.desc, ref->data.strong, | |
1234 | ref->data.weak); | |
1235 | return false; | |
355b0502 | 1236 | } |
372e3147 | 1237 | ref->data.weak--; |
355b0502 | 1238 | } |
372e3147 | 1239 | if (ref->data.strong == 0 && ref->data.weak == 0) { |
2c1838dc | 1240 | binder_cleanup_ref_olocked(ref); |
372e3147 TK |
1241 | return true; |
1242 | } | |
1243 | return false; | |
1244 | } | |
1245 | ||
1246 | /** | |
1247 | * binder_get_node_from_ref() - get the node from the given proc/desc | |
1248 | * @proc: proc containing the ref | |
1249 | * @desc: the handle associated with the ref | |
1250 | * @need_strong_ref: if true, only return node if ref is strong | |
1251 | * @rdata: the id/refcount data for the ref | |
1252 | * | |
1253 | * Given a proc and ref handle, return the associated binder_node | |
1254 | * | |
1255 | * Return: a binder_node or NULL if not found or not strong when strong required | |
1256 | */ | |
1257 | static struct binder_node *binder_get_node_from_ref( | |
1258 | struct binder_proc *proc, | |
1259 | u32 desc, bool need_strong_ref, | |
1260 | struct binder_ref_data *rdata) | |
1261 | { | |
1262 | struct binder_node *node; | |
1263 | struct binder_ref *ref; | |
1264 | ||
2c1838dc TK |
1265 | binder_proc_lock(proc); |
1266 | ref = binder_get_ref_olocked(proc, desc, need_strong_ref); | |
372e3147 TK |
1267 | if (!ref) |
1268 | goto err_no_ref; | |
1269 | node = ref->node; | |
adc18842 TK |
1270 | /* |
1271 | * Take an implicit reference on the node to ensure | |
1272 | * it stays alive until the call to binder_put_node() | |
1273 | */ | |
1274 | binder_inc_node_tmpref(node); | |
372e3147 TK |
1275 | if (rdata) |
1276 | *rdata = ref->data; | |
2c1838dc | 1277 | binder_proc_unlock(proc); |
372e3147 TK |
1278 | |
1279 | return node; | |
1280 | ||
1281 | err_no_ref: | |
2c1838dc | 1282 | binder_proc_unlock(proc); |
372e3147 TK |
1283 | return NULL; |
1284 | } | |
1285 | ||
1286 | /** | |
1287 | * binder_free_ref() - free the binder_ref | |
1288 | * @ref: ref to free | |
1289 | * | |
ed29721e TK |
1290 | * Free the binder_ref. Free the binder_node indicated by ref->node |
1291 | * (if non-NULL) and the binder_ref_death indicated by ref->death. | |
372e3147 TK |
1292 | */ |
1293 | static void binder_free_ref(struct binder_ref *ref) | |
1294 | { | |
ed29721e TK |
1295 | if (ref->node) |
1296 | binder_free_node(ref->node); | |
372e3147 TK |
1297 | kfree(ref->death); |
1298 | kfree(ref); | |
1299 | } | |
1300 | ||
1301 | /** | |
1302 | * binder_update_ref_for_handle() - inc/dec the ref for given handle | |
1303 | * @proc: proc containing the ref | |
1304 | * @desc: the handle associated with the ref | |
1305 | * @increment: true=inc reference, false=dec reference | |
1306 | * @strong: true=strong reference, false=weak reference | |
1307 | * @rdata: the id/refcount data for the ref | |
1308 | * | |
1309 | * Given a proc and ref handle, increment or decrement the ref | |
1310 | * according to "increment" arg. | |
1311 | * | |
1312 | * Return: 0 if successful, else errno | |
1313 | */ | |
1314 | static int binder_update_ref_for_handle(struct binder_proc *proc, | |
1315 | uint32_t desc, bool increment, bool strong, | |
1316 | struct binder_ref_data *rdata) | |
1317 | { | |
1318 | int ret = 0; | |
1319 | struct binder_ref *ref; | |
1320 | bool delete_ref = false; | |
1321 | ||
2c1838dc TK |
1322 | binder_proc_lock(proc); |
1323 | ref = binder_get_ref_olocked(proc, desc, strong); | |
372e3147 TK |
1324 | if (!ref) { |
1325 | ret = -EINVAL; | |
1326 | goto err_no_ref; | |
1327 | } | |
1328 | if (increment) | |
2c1838dc | 1329 | ret = binder_inc_ref_olocked(ref, strong, NULL); |
372e3147 | 1330 | else |
2c1838dc | 1331 | delete_ref = binder_dec_ref_olocked(ref, strong); |
372e3147 TK |
1332 | |
1333 | if (rdata) | |
1334 | *rdata = ref->data; | |
2c1838dc | 1335 | binder_proc_unlock(proc); |
372e3147 TK |
1336 | |
1337 | if (delete_ref) | |
1338 | binder_free_ref(ref); | |
1339 | return ret; | |
1340 | ||
1341 | err_no_ref: | |
2c1838dc | 1342 | binder_proc_unlock(proc); |
372e3147 TK |
1343 | return ret; |
1344 | } | |
1345 | ||
1346 | /** | |
1347 | * binder_dec_ref_for_handle() - dec the ref for given handle | |
1348 | * @proc: proc containing the ref | |
1349 | * @desc: the handle associated with the ref | |
1350 | * @strong: true=strong reference, false=weak reference | |
1351 | * @rdata: the id/refcount data for the ref | |
1352 | * | |
1353 | * Just calls binder_update_ref_for_handle() to decrement the ref. | |
1354 | * | |
1355 | * Return: 0 if successful, else errno | |
1356 | */ | |
1357 | static int binder_dec_ref_for_handle(struct binder_proc *proc, | |
1358 | uint32_t desc, bool strong, struct binder_ref_data *rdata) | |
1359 | { | |
1360 | return binder_update_ref_for_handle(proc, desc, false, strong, rdata); | |
1361 | } | |
1362 | ||
1363 | ||
1364 | /** | |
1365 | * binder_inc_ref_for_node() - increment the ref for given proc/node | |
1366 | * @proc: proc containing the ref | |
1367 | * @node: target node | |
1368 | * @strong: true=strong reference, false=weak reference | |
1369 | * @target_list: worklist to use if node is incremented | |
1370 | * @rdata: the id/refcount data for the ref | |
1371 | * | |
1372 | * Given a proc and node, increment the ref. Create the ref if it | |
1373 | * doesn't already exist | |
1374 | * | |
1375 | * Return: 0 if successful, else errno | |
1376 | */ | |
1377 | static int binder_inc_ref_for_node(struct binder_proc *proc, | |
1378 | struct binder_node *node, | |
1379 | bool strong, | |
1380 | struct list_head *target_list, | |
1381 | struct binder_ref_data *rdata) | |
1382 | { | |
1383 | struct binder_ref *ref; | |
1384 | struct binder_ref *new_ref = NULL; | |
1385 | int ret = 0; | |
1386 | ||
2c1838dc TK |
1387 | binder_proc_lock(proc); |
1388 | ref = binder_get_ref_for_node_olocked(proc, node, NULL); | |
372e3147 | 1389 | if (!ref) { |
2c1838dc | 1390 | binder_proc_unlock(proc); |
372e3147 TK |
1391 | new_ref = kzalloc(sizeof(*ref), GFP_KERNEL); |
1392 | if (!new_ref) | |
1393 | return -ENOMEM; | |
2c1838dc TK |
1394 | binder_proc_lock(proc); |
1395 | ref = binder_get_ref_for_node_olocked(proc, node, new_ref); | |
372e3147 | 1396 | } |
2c1838dc | 1397 | ret = binder_inc_ref_olocked(ref, strong, target_list); |
372e3147 | 1398 | *rdata = ref->data; |
a0e44c64 CL |
1399 | if (ret && ref == new_ref) { |
1400 | /* | |
1401 | * Cleanup the failed reference here as the target | |
1402 | * could now be dead and have already released its | |
1403 | * references by now. Calling on the new reference | |
1404 | * with strong=0 and a tmp_refs will not decrement | |
1405 | * the node. The new_ref gets kfree'd below. | |
1406 | */ | |
1407 | binder_cleanup_ref_olocked(new_ref); | |
1408 | ref = NULL; | |
1409 | } | |
1410 | ||
2c1838dc | 1411 | binder_proc_unlock(proc); |
372e3147 TK |
1412 | if (new_ref && ref != new_ref) |
1413 | /* | |
1414 | * Another thread created the ref first so | |
1415 | * free the one we allocated | |
1416 | */ | |
1417 | kfree(new_ref); | |
1418 | return ret; | |
355b0502 GKH |
1419 | } |
1420 | ||
0b89d69a MC |
1421 | static void binder_pop_transaction_ilocked(struct binder_thread *target_thread, |
1422 | struct binder_transaction *t) | |
355b0502 | 1423 | { |
b6d282ce | 1424 | BUG_ON(!target_thread); |
858b2719 | 1425 | assert_spin_locked(&target_thread->proc->inner_lock); |
b6d282ce TK |
1426 | BUG_ON(target_thread->transaction_stack != t); |
1427 | BUG_ON(target_thread->transaction_stack->from != target_thread); | |
1428 | target_thread->transaction_stack = | |
1429 | target_thread->transaction_stack->from_parent; | |
1430 | t->from = NULL; | |
1431 | } | |
1432 | ||
7a4408c6 TK |
1433 | /** |
1434 | * binder_thread_dec_tmpref() - decrement thread->tmp_ref | |
1435 | * @thread: thread to decrement | |
1436 | * | |
1437 | * A thread needs to be kept alive while being used to create or | |
1438 | * handle a transaction. binder_get_txn_from() is used to safely | |
1439 | * extract t->from from a binder_transaction and keep the thread | |
1440 | * indicated by t->from from being freed. When done with that | |
1441 | * binder_thread, this function is called to decrement the | |
1442 | * tmp_ref and free if appropriate (thread has been released | |
1443 | * and no transaction being processed by the driver) | |
1444 | */ | |
1445 | static void binder_thread_dec_tmpref(struct binder_thread *thread) | |
1446 | { | |
1447 | /* | |
1448 | * atomic is used to protect the counter value while | |
1449 | * it cannot reach zero or thread->is_dead is false | |
7a4408c6 | 1450 | */ |
7bd7b0e6 | 1451 | binder_inner_proc_lock(thread->proc); |
7a4408c6 TK |
1452 | atomic_dec(&thread->tmp_ref); |
1453 | if (thread->is_dead && !atomic_read(&thread->tmp_ref)) { | |
7bd7b0e6 | 1454 | binder_inner_proc_unlock(thread->proc); |
7a4408c6 TK |
1455 | binder_free_thread(thread); |
1456 | return; | |
1457 | } | |
7bd7b0e6 | 1458 | binder_inner_proc_unlock(thread->proc); |
7a4408c6 TK |
1459 | } |
1460 | ||
1461 | /** | |
1462 | * binder_proc_dec_tmpref() - decrement proc->tmp_ref | |
1463 | * @proc: proc to decrement | |
1464 | * | |
1465 | * A binder_proc needs to be kept alive while being used to create or | |
1466 | * handle a transaction. proc->tmp_ref is incremented when | |
1467 | * creating a new transaction or the binder_proc is currently in-use | |
1468 | * by threads that are being released. When done with the binder_proc, | |
1469 | * this function is called to decrement the counter and free the | |
1470 | * proc if appropriate (proc has been released, all threads have | |
1471 | * been released and not currenly in-use to process a transaction). | |
1472 | */ | |
1473 | static void binder_proc_dec_tmpref(struct binder_proc *proc) | |
1474 | { | |
7bd7b0e6 | 1475 | binder_inner_proc_lock(proc); |
7a4408c6 TK |
1476 | proc->tmp_ref--; |
1477 | if (proc->is_dead && RB_EMPTY_ROOT(&proc->threads) && | |
1478 | !proc->tmp_ref) { | |
7bd7b0e6 | 1479 | binder_inner_proc_unlock(proc); |
7a4408c6 TK |
1480 | binder_free_proc(proc); |
1481 | return; | |
1482 | } | |
7bd7b0e6 | 1483 | binder_inner_proc_unlock(proc); |
7a4408c6 TK |
1484 | } |
1485 | ||
1486 | /** | |
1487 | * binder_get_txn_from() - safely extract the "from" thread in transaction | |
1488 | * @t: binder transaction for t->from | |
1489 | * | |
1490 | * Atomically return the "from" thread and increment the tmp_ref | |
1491 | * count for the thread to ensure it stays alive until | |
1492 | * binder_thread_dec_tmpref() is called. | |
1493 | * | |
1494 | * Return: the value of t->from | |
1495 | */ | |
1496 | static struct binder_thread *binder_get_txn_from( | |
1497 | struct binder_transaction *t) | |
1498 | { | |
1499 | struct binder_thread *from; | |
1500 | ||
1501 | spin_lock(&t->lock); | |
1502 | from = t->from; | |
1503 | if (from) | |
1504 | atomic_inc(&from->tmp_ref); | |
1505 | spin_unlock(&t->lock); | |
1506 | return from; | |
1507 | } | |
1508 | ||
0b89d69a MC |
1509 | /** |
1510 | * binder_get_txn_from_and_acq_inner() - get t->from and acquire inner lock | |
1511 | * @t: binder transaction for t->from | |
1512 | * | |
1513 | * Same as binder_get_txn_from() except it also acquires the proc->inner_lock | |
1514 | * to guarantee that the thread cannot be released while operating on it. | |
1515 | * The caller must call binder_inner_proc_unlock() to release the inner lock | |
1516 | * as well as call binder_dec_thread_txn() to release the reference. | |
1517 | * | |
1518 | * Return: the value of t->from | |
1519 | */ | |
1520 | static struct binder_thread *binder_get_txn_from_and_acq_inner( | |
1521 | struct binder_transaction *t) | |
324fa64c | 1522 | __acquires(&t->from->proc->inner_lock) |
0b89d69a MC |
1523 | { |
1524 | struct binder_thread *from; | |
1525 | ||
1526 | from = binder_get_txn_from(t); | |
324fa64c TK |
1527 | if (!from) { |
1528 | __acquire(&from->proc->inner_lock); | |
0b89d69a | 1529 | return NULL; |
324fa64c | 1530 | } |
0b89d69a MC |
1531 | binder_inner_proc_lock(from->proc); |
1532 | if (t->from) { | |
1533 | BUG_ON(from != t->from); | |
1534 | return from; | |
1535 | } | |
1536 | binder_inner_proc_unlock(from->proc); | |
324fa64c | 1537 | __acquire(&from->proc->inner_lock); |
0b89d69a MC |
1538 | binder_thread_dec_tmpref(from); |
1539 | return NULL; | |
1540 | } | |
1541 | ||
44d8047f TK |
1542 | /** |
1543 | * binder_free_txn_fixups() - free unprocessed fd fixups | |
1544 | * @t: binder transaction for t->from | |
1545 | * | |
1546 | * If the transaction is being torn down prior to being | |
1547 | * processed by the target process, free all of the | |
1548 | * fd fixups and fput the file structs. It is safe to | |
1549 | * call this function after the fixups have been | |
1550 | * processed -- in that case, the list will be empty. | |
1551 | */ | |
1552 | static void binder_free_txn_fixups(struct binder_transaction *t) | |
1553 | { | |
1554 | struct binder_txn_fd_fixup *fixup, *tmp; | |
1555 | ||
1556 | list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) { | |
1557 | fput(fixup->file); | |
a8a570c6 CL |
1558 | if (fixup->target_fd >= 0) |
1559 | put_unused_fd(fixup->target_fd); | |
44d8047f TK |
1560 | list_del(&fixup->fixup_entry); |
1561 | kfree(fixup); | |
1562 | } | |
1563 | } | |
1564 | ||
1987f112 FC |
1565 | static void binder_txn_latency_free(struct binder_transaction *t) |
1566 | { | |
1567 | int from_proc, from_thread, to_proc, to_thread; | |
1568 | ||
1569 | spin_lock(&t->lock); | |
1570 | from_proc = t->from ? t->from->proc->pid : 0; | |
1571 | from_thread = t->from ? t->from->pid : 0; | |
1572 | to_proc = t->to_proc ? t->to_proc->pid : 0; | |
1573 | to_thread = t->to_thread ? t->to_thread->pid : 0; | |
1574 | spin_unlock(&t->lock); | |
1575 | ||
1576 | trace_binder_txn_latency_free(t, from_proc, from_thread, to_proc, to_thread); | |
1577 | } | |
1578 | ||
b6d282ce TK |
1579 | static void binder_free_transaction(struct binder_transaction *t) |
1580 | { | |
a370003c TK |
1581 | struct binder_proc *target_proc = t->to_proc; |
1582 | ||
1583 | if (target_proc) { | |
1584 | binder_inner_proc_lock(target_proc); | |
432ff1e9 MB |
1585 | target_proc->outstanding_txns--; |
1586 | if (target_proc->outstanding_txns < 0) | |
1587 | pr_warn("%s: Unexpected outstanding_txns %d\n", | |
1588 | __func__, target_proc->outstanding_txns); | |
1589 | if (!target_proc->outstanding_txns && target_proc->is_frozen) | |
1590 | wake_up_interruptible_all(&target_proc->freeze_wait); | |
a370003c TK |
1591 | if (t->buffer) |
1592 | t->buffer->transaction = NULL; | |
1593 | binder_inner_proc_unlock(target_proc); | |
1594 | } | |
1987f112 FC |
1595 | if (trace_binder_txn_latency_free_enabled()) |
1596 | binder_txn_latency_free(t); | |
a370003c TK |
1597 | /* |
1598 | * If the transaction has no target_proc, then | |
1599 | * t->buffer->transaction has already been cleared. | |
1600 | */ | |
44d8047f | 1601 | binder_free_txn_fixups(t); |
355b0502 GKH |
1602 | kfree(t); |
1603 | binder_stats_deleted(BINDER_STAT_TRANSACTION); | |
1604 | } | |
1605 | ||
1606 | static void binder_send_failed_reply(struct binder_transaction *t, | |
1607 | uint32_t error_code) | |
1608 | { | |
1609 | struct binder_thread *target_thread; | |
d4ec15e1 | 1610 | struct binder_transaction *next; |
10f62861 | 1611 | |
355b0502 GKH |
1612 | BUG_ON(t->flags & TF_ONE_WAY); |
1613 | while (1) { | |
0b89d69a | 1614 | target_thread = binder_get_txn_from_and_acq_inner(t); |
355b0502 | 1615 | if (target_thread) { |
26549d17 TK |
1616 | binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, |
1617 | "send failed reply for transaction %d to %d:%d\n", | |
1618 | t->debug_id, | |
1619 | target_thread->proc->pid, | |
1620 | target_thread->pid); | |
1621 | ||
0b89d69a | 1622 | binder_pop_transaction_ilocked(target_thread, t); |
26549d17 TK |
1623 | if (target_thread->reply_error.cmd == BR_OK) { |
1624 | target_thread->reply_error.cmd = error_code; | |
148ade2c MC |
1625 | binder_enqueue_thread_work_ilocked( |
1626 | target_thread, | |
1627 | &target_thread->reply_error.work); | |
355b0502 GKH |
1628 | wake_up_interruptible(&target_thread->wait); |
1629 | } else { | |
e46a3b3b TK |
1630 | /* |
1631 | * Cannot get here for normal operation, but | |
1632 | * we can if multiple synchronous transactions | |
1633 | * are sent without blocking for responses. | |
1634 | * Just ignore the 2nd error in this case. | |
1635 | */ | |
1636 | pr_warn("Unexpected reply error: %u\n", | |
1637 | target_thread->reply_error.cmd); | |
355b0502 | 1638 | } |
0b89d69a | 1639 | binder_inner_proc_unlock(target_thread->proc); |
7a4408c6 | 1640 | binder_thread_dec_tmpref(target_thread); |
26549d17 | 1641 | binder_free_transaction(t); |
355b0502 | 1642 | return; |
d4ec15e1 | 1643 | } |
72b93c79 | 1644 | __release(&target_thread->proc->inner_lock); |
d4ec15e1 LT |
1645 | next = t->from_parent; |
1646 | ||
1647 | binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, | |
1648 | "send failed reply for transaction %d, target dead\n", | |
1649 | t->debug_id); | |
1650 | ||
b6d282ce | 1651 | binder_free_transaction(t); |
d4ec15e1 | 1652 | if (next == NULL) { |
355b0502 | 1653 | binder_debug(BINDER_DEBUG_DEAD_BINDER, |
d4ec15e1 LT |
1654 | "reply failed, no target thread at root\n"); |
1655 | return; | |
355b0502 | 1656 | } |
d4ec15e1 LT |
1657 | t = next; |
1658 | binder_debug(BINDER_DEBUG_DEAD_BINDER, | |
1659 | "reply failed, no target thread -- retry %d\n", | |
1660 | t->debug_id); | |
355b0502 GKH |
1661 | } |
1662 | } | |
1663 | ||
fb2c4452 MC |
1664 | /** |
1665 | * binder_cleanup_transaction() - cleans up undelivered transaction | |
1666 | * @t: transaction that needs to be cleaned up | |
1667 | * @reason: reason the transaction wasn't delivered | |
1668 | * @error_code: error to return to caller (if synchronous call) | |
1669 | */ | |
1670 | static void binder_cleanup_transaction(struct binder_transaction *t, | |
1671 | const char *reason, | |
1672 | uint32_t error_code) | |
1673 | { | |
1674 | if (t->buffer->target_node && !(t->flags & TF_ONE_WAY)) { | |
1675 | binder_send_failed_reply(t, error_code); | |
1676 | } else { | |
1677 | binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, | |
1678 | "undelivered transaction %d, %s\n", | |
1679 | t->debug_id, reason); | |
1680 | binder_free_transaction(t); | |
1681 | } | |
1682 | } | |
1683 | ||
feba3900 | 1684 | /** |
7a67a393 TK |
1685 | * binder_get_object() - gets object and checks for valid metadata |
1686 | * @proc: binder_proc owning the buffer | |
6d98eb95 | 1687 | * @u: sender's user pointer to base of buffer |
feba3900 | 1688 | * @buffer: binder_buffer that we're parsing. |
7a67a393 TK |
1689 | * @offset: offset in the @buffer at which to validate an object. |
1690 | * @object: struct binder_object to read into | |
feba3900 | 1691 | * |
6d98eb95 TK |
1692 | * Copy the binder object at the given offset into @object. If @u is |
1693 | * provided then the copy is from the sender's buffer. If not, then | |
1694 | * it is copied from the target's @buffer. | |
1695 | * | |
1696 | * Return: If there's a valid metadata object at @offset, the | |
7a67a393 TK |
1697 | * size of that object. Otherwise, it returns zero. The object |
1698 | * is read into the struct binder_object pointed to by @object. | |
feba3900 | 1699 | */ |
7a67a393 | 1700 | static size_t binder_get_object(struct binder_proc *proc, |
6d98eb95 | 1701 | const void __user *u, |
7a67a393 TK |
1702 | struct binder_buffer *buffer, |
1703 | unsigned long offset, | |
1704 | struct binder_object *object) | |
feba3900 | 1705 | { |
7a67a393 | 1706 | size_t read_size; |
feba3900 MC |
1707 | struct binder_object_header *hdr; |
1708 | size_t object_size = 0; | |
1709 | ||
7a67a393 | 1710 | read_size = min_t(size_t, sizeof(*object), buffer->data_size - offset); |
6d98eb95 | 1711 | if (offset > buffer->data_size || read_size < sizeof(*hdr)) |
feba3900 | 1712 | return 0; |
6d98eb95 TK |
1713 | if (u) { |
1714 | if (copy_from_user(object, u + offset, read_size)) | |
1715 | return 0; | |
1716 | } else { | |
1717 | if (binder_alloc_copy_from_buffer(&proc->alloc, object, buffer, | |
1718 | offset, read_size)) | |
1719 | return 0; | |
1720 | } | |
feba3900 | 1721 | |
7a67a393 TK |
1722 | /* Ok, now see if we read a complete object. */ |
1723 | hdr = &object->hdr; | |
feba3900 MC |
1724 | switch (hdr->type) { |
1725 | case BINDER_TYPE_BINDER: | |
1726 | case BINDER_TYPE_WEAK_BINDER: | |
1727 | case BINDER_TYPE_HANDLE: | |
1728 | case BINDER_TYPE_WEAK_HANDLE: | |
1729 | object_size = sizeof(struct flat_binder_object); | |
1730 | break; | |
1731 | case BINDER_TYPE_FD: | |
1732 | object_size = sizeof(struct binder_fd_object); | |
1733 | break; | |
7980240b MC |
1734 | case BINDER_TYPE_PTR: |
1735 | object_size = sizeof(struct binder_buffer_object); | |
1736 | break; | |
def95c73 MC |
1737 | case BINDER_TYPE_FDA: |
1738 | object_size = sizeof(struct binder_fd_array_object); | |
1739 | break; | |
feba3900 MC |
1740 | default: |
1741 | return 0; | |
1742 | } | |
1743 | if (offset <= buffer->data_size - object_size && | |
1744 | buffer->data_size >= object_size) | |
1745 | return object_size; | |
1746 | else | |
1747 | return 0; | |
1748 | } | |
1749 | ||
7980240b MC |
1750 | /** |
1751 | * binder_validate_ptr() - validates binder_buffer_object in a binder_buffer. | |
db6b0b81 | 1752 | * @proc: binder_proc owning the buffer |
7980240b | 1753 | * @b: binder_buffer containing the object |
db6b0b81 | 1754 | * @object: struct binder_object to read into |
7980240b MC |
1755 | * @index: index in offset array at which the binder_buffer_object is |
1756 | * located | |
db6b0b81 TK |
1757 | * @start_offset: points to the start of the offset array |
1758 | * @object_offsetp: offset of @object read from @b | |
7980240b MC |
1759 | * @num_valid: the number of valid offsets in the offset array |
1760 | * | |
1761 | * Return: If @index is within the valid range of the offset array | |
1762 | * described by @start and @num_valid, and if there's a valid | |
1763 | * binder_buffer_object at the offset found in index @index | |
1764 | * of the offset array, that object is returned. Otherwise, | |
1765 | * %NULL is returned. | |
1766 | * Note that the offset found in index @index itself is not | |
1767 | * verified; this function assumes that @num_valid elements | |
1768 | * from @start were previously verified to have valid offsets. | |
db6b0b81 TK |
1769 | * If @object_offsetp is non-NULL, then the offset within |
1770 | * @b is written to it. | |
7980240b | 1771 | */ |
db6b0b81 TK |
1772 | static struct binder_buffer_object *binder_validate_ptr( |
1773 | struct binder_proc *proc, | |
1774 | struct binder_buffer *b, | |
1775 | struct binder_object *object, | |
1776 | binder_size_t index, | |
1777 | binder_size_t start_offset, | |
1778 | binder_size_t *object_offsetp, | |
1779 | binder_size_t num_valid) | |
7980240b | 1780 | { |
db6b0b81 TK |
1781 | size_t object_size; |
1782 | binder_size_t object_offset; | |
1783 | unsigned long buffer_offset; | |
7980240b MC |
1784 | |
1785 | if (index >= num_valid) | |
1786 | return NULL; | |
1787 | ||
db6b0b81 | 1788 | buffer_offset = start_offset + sizeof(binder_size_t) * index; |
bb4a2e48 TK |
1789 | if (binder_alloc_copy_from_buffer(&proc->alloc, &object_offset, |
1790 | b, buffer_offset, | |
1791 | sizeof(object_offset))) | |
1792 | return NULL; | |
6d98eb95 | 1793 | object_size = binder_get_object(proc, NULL, b, object_offset, object); |
db6b0b81 | 1794 | if (!object_size || object->hdr.type != BINDER_TYPE_PTR) |
7980240b | 1795 | return NULL; |
db6b0b81 TK |
1796 | if (object_offsetp) |
1797 | *object_offsetp = object_offset; | |
7980240b | 1798 | |
db6b0b81 | 1799 | return &object->bbo; |
7980240b MC |
1800 | } |
1801 | ||
1802 | /** | |
1803 | * binder_validate_fixup() - validates pointer/fd fixups happen in order. | |
db6b0b81 | 1804 | * @proc: binder_proc owning the buffer |
7980240b | 1805 | * @b: transaction buffer |
db6b0b81 TK |
1806 | * @objects_start_offset: offset to start of objects buffer |
1807 | * @buffer_obj_offset: offset to binder_buffer_object in which to fix up | |
1808 | * @fixup_offset: start offset in @buffer to fix up | |
1809 | * @last_obj_offset: offset to last binder_buffer_object that we fixed | |
1810 | * @last_min_offset: minimum fixup offset in object at @last_obj_offset | |
7980240b MC |
1811 | * |
1812 | * Return: %true if a fixup in buffer @buffer at offset @offset is | |
1813 | * allowed. | |
1814 | * | |
1815 | * For safety reasons, we only allow fixups inside a buffer to happen | |
1816 | * at increasing offsets; additionally, we only allow fixup on the last | |
1817 | * buffer object that was verified, or one of its parents. | |
1818 | * | |
1819 | * Example of what is allowed: | |
1820 | * | |
1821 | * A | |
1822 | * B (parent = A, offset = 0) | |
1823 | * C (parent = A, offset = 16) | |
1824 | * D (parent = C, offset = 0) | |
1825 | * E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset) | |
1826 | * | |
1827 | * Examples of what is not allowed: | |
1828 | * | |
1829 | * Decreasing offsets within the same parent: | |
1830 | * A | |
1831 | * C (parent = A, offset = 16) | |
1832 | * B (parent = A, offset = 0) // decreasing offset within A | |
1833 | * | |
1834 | * Referring to a parent that wasn't the last object or any of its parents: | |
1835 | * A | |
1836 | * B (parent = A, offset = 0) | |
1837 | * C (parent = A, offset = 0) | |
1838 | * C (parent = A, offset = 16) | |
1839 | * D (parent = B, offset = 0) // B is not A or any of A's parents | |
1840 | */ | |
db6b0b81 TK |
1841 | static bool binder_validate_fixup(struct binder_proc *proc, |
1842 | struct binder_buffer *b, | |
1843 | binder_size_t objects_start_offset, | |
1844 | binder_size_t buffer_obj_offset, | |
7980240b | 1845 | binder_size_t fixup_offset, |
db6b0b81 | 1846 | binder_size_t last_obj_offset, |
7980240b MC |
1847 | binder_size_t last_min_offset) |
1848 | { | |
db6b0b81 | 1849 | if (!last_obj_offset) { |
7980240b MC |
1850 | /* Nothing to fix up in */ |
1851 | return false; | |
1852 | } | |
1853 | ||
db6b0b81 TK |
1854 | while (last_obj_offset != buffer_obj_offset) { |
1855 | unsigned long buffer_offset; | |
1856 | struct binder_object last_object; | |
1857 | struct binder_buffer_object *last_bbo; | |
6d98eb95 TK |
1858 | size_t object_size = binder_get_object(proc, NULL, b, |
1859 | last_obj_offset, | |
db6b0b81 TK |
1860 | &last_object); |
1861 | if (object_size != sizeof(*last_bbo)) | |
1862 | return false; | |
1863 | ||
1864 | last_bbo = &last_object.bbo; | |
7980240b MC |
1865 | /* |
1866 | * Safe to retrieve the parent of last_obj, since it | |
1867 | * was already previously verified by the driver. | |
1868 | */ | |
db6b0b81 | 1869 | if ((last_bbo->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0) |
7980240b | 1870 | return false; |
db6b0b81 TK |
1871 | last_min_offset = last_bbo->parent_offset + sizeof(uintptr_t); |
1872 | buffer_offset = objects_start_offset + | |
bb4a2e48 TK |
1873 | sizeof(binder_size_t) * last_bbo->parent; |
1874 | if (binder_alloc_copy_from_buffer(&proc->alloc, | |
1875 | &last_obj_offset, | |
1876 | b, buffer_offset, | |
1877 | sizeof(last_obj_offset))) | |
1878 | return false; | |
7980240b MC |
1879 | } |
1880 | return (fixup_offset >= last_min_offset); | |
1881 | } | |
1882 | ||
80cd7956 TK |
1883 | /** |
1884 | * struct binder_task_work_cb - for deferred close | |
1885 | * | |
1886 | * @twork: callback_head for task work | |
1887 | * @fd: fd to close | |
1888 | * | |
1889 | * Structure to pass task work to be handled after | |
1890 | * returning from binder_ioctl() via task_work_add(). | |
1891 | */ | |
1892 | struct binder_task_work_cb { | |
1893 | struct callback_head twork; | |
1894 | struct file *file; | |
1895 | }; | |
1896 | ||
1897 | /** | |
1898 | * binder_do_fd_close() - close list of file descriptors | |
1899 | * @twork: callback head for task work | |
1900 | * | |
1901 | * It is not safe to call ksys_close() during the binder_ioctl() | |
1902 | * function if there is a chance that binder's own file descriptor | |
1903 | * might be closed. This is to meet the requirements for using | |
1904 | * fdget() (see comments for __fget_light()). Therefore use | |
1905 | * task_work_add() to schedule the close operation once we have | |
1906 | * returned from binder_ioctl(). This function is a callback | |
1907 | * for that mechanism and does the actual ksys_close() on the | |
1908 | * given file descriptor. | |
1909 | */ | |
1910 | static void binder_do_fd_close(struct callback_head *twork) | |
1911 | { | |
1912 | struct binder_task_work_cb *twcb = container_of(twork, | |
1913 | struct binder_task_work_cb, twork); | |
1914 | ||
1915 | fput(twcb->file); | |
1916 | kfree(twcb); | |
1917 | } | |
1918 | ||
1919 | /** | |
1920 | * binder_deferred_fd_close() - schedule a close for the given file-descriptor | |
1921 | * @fd: file-descriptor to close | |
1922 | * | |
1923 | * See comments in binder_do_fd_close(). This function is used to schedule | |
1924 | * a file-descriptor to be closed after returning from binder_ioctl(). | |
1925 | */ | |
1926 | static void binder_deferred_fd_close(int fd) | |
1927 | { | |
1928 | struct binder_task_work_cb *twcb; | |
1929 | ||
1930 | twcb = kzalloc(sizeof(*twcb), GFP_KERNEL); | |
1931 | if (!twcb) | |
1932 | return; | |
1933 | init_task_work(&twcb->twork, binder_do_fd_close); | |
a88c955f | 1934 | twcb->file = file_close_fd(fd); |
6e802a4b | 1935 | if (twcb->file) { |
40a19260 AV |
1936 | // pin it until binder_do_fd_close(); see comments there |
1937 | get_file(twcb->file); | |
6e802a4b | 1938 | filp_close(twcb->file, current->files); |
91989c70 | 1939 | task_work_add(current, &twcb->twork, TWA_RESUME); |
6e802a4b | 1940 | } else { |
80cd7956 | 1941 | kfree(twcb); |
6e802a4b | 1942 | } |
80cd7956 TK |
1943 | } |
1944 | ||
355b0502 | 1945 | static void binder_transaction_buffer_release(struct binder_proc *proc, |
5fdb55c1 | 1946 | struct binder_thread *thread, |
355b0502 | 1947 | struct binder_buffer *buffer, |
bdc1c5fa | 1948 | binder_size_t off_end_offset, |
bde4a19f | 1949 | bool is_failure) |
355b0502 | 1950 | { |
355b0502 | 1951 | int debug_id = buffer->debug_id; |
bdc1c5fa | 1952 | binder_size_t off_start_offset, buffer_offset; |
355b0502 GKH |
1953 | |
1954 | binder_debug(BINDER_DEBUG_TRANSACTION, | |
bde4a19f | 1955 | "%d buffer release %d, size %zd-%zd, failed at %llx\n", |
355b0502 | 1956 | proc->pid, buffer->debug_id, |
bde4a19f | 1957 | buffer->data_size, buffer->offsets_size, |
bdc1c5fa | 1958 | (unsigned long long)off_end_offset); |
355b0502 GKH |
1959 | |
1960 | if (buffer->target_node) | |
1961 | binder_dec_node(buffer->target_node, 1, 0); | |
1962 | ||
db6b0b81 | 1963 | off_start_offset = ALIGN(buffer->data_size, sizeof(void *)); |
bdc1c5fa | 1964 | |
bde4a19f TK |
1965 | for (buffer_offset = off_start_offset; buffer_offset < off_end_offset; |
1966 | buffer_offset += sizeof(binder_size_t)) { | |
feba3900 | 1967 | struct binder_object_header *hdr; |
bb4a2e48 | 1968 | size_t object_size = 0; |
7a67a393 | 1969 | struct binder_object object; |
8ced0c62 | 1970 | binder_size_t object_offset; |
8ced0c62 | 1971 | |
bb4a2e48 TK |
1972 | if (!binder_alloc_copy_from_buffer(&proc->alloc, &object_offset, |
1973 | buffer, buffer_offset, | |
1974 | sizeof(object_offset))) | |
6d98eb95 | 1975 | object_size = binder_get_object(proc, NULL, buffer, |
bb4a2e48 | 1976 | object_offset, &object); |
feba3900 MC |
1977 | if (object_size == 0) { |
1978 | pr_err("transaction release %d bad object at offset %lld, size %zd\n", | |
8ced0c62 | 1979 | debug_id, (u64)object_offset, buffer->data_size); |
355b0502 GKH |
1980 | continue; |
1981 | } | |
7a67a393 | 1982 | hdr = &object.hdr; |
feba3900 | 1983 | switch (hdr->type) { |
355b0502 GKH |
1984 | case BINDER_TYPE_BINDER: |
1985 | case BINDER_TYPE_WEAK_BINDER: { | |
feba3900 MC |
1986 | struct flat_binder_object *fp; |
1987 | struct binder_node *node; | |
10f62861 | 1988 | |
feba3900 MC |
1989 | fp = to_flat_binder_object(hdr); |
1990 | node = binder_get_node(proc, fp->binder); | |
355b0502 | 1991 | if (node == NULL) { |
da49889d AH |
1992 | pr_err("transaction release %d bad node %016llx\n", |
1993 | debug_id, (u64)fp->binder); | |
355b0502 GKH |
1994 | break; |
1995 | } | |
1996 | binder_debug(BINDER_DEBUG_TRANSACTION, | |
da49889d AH |
1997 | " node %d u%016llx\n", |
1998 | node->debug_id, (u64)node->ptr); | |
feba3900 MC |
1999 | binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER, |
2000 | 0); | |
adc18842 | 2001 | binder_put_node(node); |
355b0502 GKH |
2002 | } break; |
2003 | case BINDER_TYPE_HANDLE: | |
2004 | case BINDER_TYPE_WEAK_HANDLE: { | |
feba3900 | 2005 | struct flat_binder_object *fp; |
372e3147 TK |
2006 | struct binder_ref_data rdata; |
2007 | int ret; | |
0a3ffab9 | 2008 | |
feba3900 | 2009 | fp = to_flat_binder_object(hdr); |
372e3147 TK |
2010 | ret = binder_dec_ref_for_handle(proc, fp->handle, |
2011 | hdr->type == BINDER_TYPE_HANDLE, &rdata); | |
2012 | ||
2013 | if (ret) { | |
2014 | pr_err("transaction release %d bad handle %d, ret = %d\n", | |
2015 | debug_id, fp->handle, ret); | |
355b0502 GKH |
2016 | break; |
2017 | } | |
2018 | binder_debug(BINDER_DEBUG_TRANSACTION, | |
372e3147 TK |
2019 | " ref %d desc %d\n", |
2020 | rdata.debug_id, rdata.desc); | |
355b0502 GKH |
2021 | } break; |
2022 | ||
feba3900 | 2023 | case BINDER_TYPE_FD: { |
44d8047f TK |
2024 | /* |
2025 | * No need to close the file here since user-space | |
690cfa20 | 2026 | * closes it for successfully delivered |
44d8047f TK |
2027 | * transactions. For transactions that weren't |
2028 | * delivered, the new fd was never allocated so | |
2029 | * there is no need to close and the fput on the | |
2030 | * file is done when the transaction is torn | |
2031 | * down. | |
2032 | */ | |
feba3900 | 2033 | } break; |
7980240b MC |
2034 | case BINDER_TYPE_PTR: |
2035 | /* | |
2036 | * Nothing to do here, this will get cleaned up when the | |
2037 | * transaction buffer gets freed | |
2038 | */ | |
2039 | break; | |
def95c73 MC |
2040 | case BINDER_TYPE_FDA: { |
2041 | struct binder_fd_array_object *fda; | |
2042 | struct binder_buffer_object *parent; | |
db6b0b81 | 2043 | struct binder_object ptr_object; |
bde4a19f | 2044 | binder_size_t fda_offset; |
def95c73 MC |
2045 | size_t fd_index; |
2046 | binder_size_t fd_buf_size; | |
bde4a19f | 2047 | binder_size_t num_valid; |
def95c73 | 2048 | |
32e9f56a | 2049 | if (is_failure) { |
44d8047f | 2050 | /* |
44d8047f TK |
2051 | * The fd fixups have not been applied so no |
2052 | * fds need to be closed. | |
2053 | */ | |
2054 | continue; | |
2055 | } | |
2056 | ||
bde4a19f TK |
2057 | num_valid = (buffer_offset - off_start_offset) / |
2058 | sizeof(binder_size_t); | |
def95c73 | 2059 | fda = to_binder_fd_array_object(hdr); |
db6b0b81 TK |
2060 | parent = binder_validate_ptr(proc, buffer, &ptr_object, |
2061 | fda->parent, | |
2062 | off_start_offset, | |
2063 | NULL, | |
bde4a19f | 2064 | num_valid); |
def95c73 | 2065 | if (!parent) { |
f7f84fde | 2066 | pr_err("transaction release %d bad parent offset\n", |
def95c73 MC |
2067 | debug_id); |
2068 | continue; | |
2069 | } | |
def95c73 MC |
2070 | fd_buf_size = sizeof(u32) * fda->num_fds; |
2071 | if (fda->num_fds >= SIZE_MAX / sizeof(u32)) { | |
2072 | pr_err("transaction release %d invalid number of fds (%lld)\n", | |
2073 | debug_id, (u64)fda->num_fds); | |
2074 | continue; | |
2075 | } | |
2076 | if (fd_buf_size > parent->length || | |
2077 | fda->parent_offset > parent->length - fd_buf_size) { | |
2078 | /* No space for all file descriptors here. */ | |
2079 | pr_err("transaction release %d not enough space for %lld fds in buffer\n", | |
2080 | debug_id, (u64)fda->num_fds); | |
2081 | continue; | |
2082 | } | |
bde4a19f TK |
2083 | /* |
2084 | * the source data for binder_buffer_object is visible | |
2085 | * to user-space and the @buffer element is the user | |
2086 | * pointer to the buffer_object containing the fd_array. | |
2087 | * Convert the address to an offset relative to | |
2088 | * the base of the transaction buffer. | |
2089 | */ | |
df9aabea CL |
2090 | fda_offset = parent->buffer - buffer->user_data + |
2091 | fda->parent_offset; | |
8ced0c62 TK |
2092 | for (fd_index = 0; fd_index < fda->num_fds; |
2093 | fd_index++) { | |
2094 | u32 fd; | |
bb4a2e48 | 2095 | int err; |
bde4a19f TK |
2096 | binder_size_t offset = fda_offset + |
2097 | fd_index * sizeof(fd); | |
8ced0c62 | 2098 | |
bb4a2e48 TK |
2099 | err = binder_alloc_copy_from_buffer( |
2100 | &proc->alloc, &fd, buffer, | |
2101 | offset, sizeof(fd)); | |
2102 | WARN_ON(err); | |
5fdb55c1 | 2103 | if (!err) { |
bb4a2e48 | 2104 | binder_deferred_fd_close(fd); |
5fdb55c1 TK |
2105 | /* |
2106 | * Need to make sure the thread goes | |
2107 | * back to userspace to complete the | |
2108 | * deferred close | |
2109 | */ | |
2110 | if (thread) | |
2111 | thread->looper_need_return = true; | |
2112 | } | |
8ced0c62 | 2113 | } |
def95c73 | 2114 | } break; |
355b0502 | 2115 | default: |
64dcfe6b | 2116 | pr_err("transaction release %d bad object type %x\n", |
feba3900 | 2117 | debug_id, hdr->type); |
355b0502 GKH |
2118 | break; |
2119 | } | |
2120 | } | |
2121 | } | |
2122 | ||
bdc1c5fa CL |
2123 | /* Clean up all the objects in the buffer */ |
2124 | static inline void binder_release_entire_buffer(struct binder_proc *proc, | |
2125 | struct binder_thread *thread, | |
2126 | struct binder_buffer *buffer, | |
2127 | bool is_failure) | |
2128 | { | |
2129 | binder_size_t off_end_offset; | |
2130 | ||
2131 | off_end_offset = ALIGN(buffer->data_size, sizeof(void *)); | |
2132 | off_end_offset += buffer->offsets_size; | |
2133 | ||
2134 | binder_transaction_buffer_release(proc, thread, buffer, | |
2135 | off_end_offset, is_failure); | |
2136 | } | |
2137 | ||
a056af42 MC |
2138 | static int binder_translate_binder(struct flat_binder_object *fp, |
2139 | struct binder_transaction *t, | |
2140 | struct binder_thread *thread) | |
2141 | { | |
2142 | struct binder_node *node; | |
a056af42 MC |
2143 | struct binder_proc *proc = thread->proc; |
2144 | struct binder_proc *target_proc = t->to_proc; | |
372e3147 | 2145 | struct binder_ref_data rdata; |
adc18842 | 2146 | int ret = 0; |
a056af42 MC |
2147 | |
2148 | node = binder_get_node(proc, fp->binder); | |
2149 | if (!node) { | |
673068ee | 2150 | node = binder_new_node(proc, fp); |
a056af42 MC |
2151 | if (!node) |
2152 | return -ENOMEM; | |
a056af42 MC |
2153 | } |
2154 | if (fp->cookie != node->cookie) { | |
2155 | binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n", | |
2156 | proc->pid, thread->pid, (u64)fp->binder, | |
2157 | node->debug_id, (u64)fp->cookie, | |
2158 | (u64)node->cookie); | |
adc18842 TK |
2159 | ret = -EINVAL; |
2160 | goto done; | |
2161 | } | |
52f88693 | 2162 | if (security_binder_transfer_binder(proc->cred, target_proc->cred)) { |
adc18842 TK |
2163 | ret = -EPERM; |
2164 | goto done; | |
a056af42 | 2165 | } |
a056af42 | 2166 | |
372e3147 TK |
2167 | ret = binder_inc_ref_for_node(target_proc, node, |
2168 | fp->hdr.type == BINDER_TYPE_BINDER, | |
2169 | &thread->todo, &rdata); | |
2170 | if (ret) | |
adc18842 | 2171 | goto done; |
a056af42 MC |
2172 | |
2173 | if (fp->hdr.type == BINDER_TYPE_BINDER) | |
2174 | fp->hdr.type = BINDER_TYPE_HANDLE; | |
2175 | else | |
2176 | fp->hdr.type = BINDER_TYPE_WEAK_HANDLE; | |
2177 | fp->binder = 0; | |
372e3147 | 2178 | fp->handle = rdata.desc; |
a056af42 | 2179 | fp->cookie = 0; |
a056af42 | 2180 | |
372e3147 | 2181 | trace_binder_transaction_node_to_ref(t, node, &rdata); |
a056af42 MC |
2182 | binder_debug(BINDER_DEBUG_TRANSACTION, |
2183 | " node %d u%016llx -> ref %d desc %d\n", | |
2184 | node->debug_id, (u64)node->ptr, | |
372e3147 | 2185 | rdata.debug_id, rdata.desc); |
adc18842 TK |
2186 | done: |
2187 | binder_put_node(node); | |
2188 | return ret; | |
a056af42 MC |
2189 | } |
2190 | ||
2191 | static int binder_translate_handle(struct flat_binder_object *fp, | |
2192 | struct binder_transaction *t, | |
2193 | struct binder_thread *thread) | |
2194 | { | |
a056af42 MC |
2195 | struct binder_proc *proc = thread->proc; |
2196 | struct binder_proc *target_proc = t->to_proc; | |
372e3147 TK |
2197 | struct binder_node *node; |
2198 | struct binder_ref_data src_rdata; | |
adc18842 | 2199 | int ret = 0; |
a056af42 | 2200 | |
372e3147 TK |
2201 | node = binder_get_node_from_ref(proc, fp->handle, |
2202 | fp->hdr.type == BINDER_TYPE_HANDLE, &src_rdata); | |
2203 | if (!node) { | |
a056af42 MC |
2204 | binder_user_error("%d:%d got transaction with invalid handle, %d\n", |
2205 | proc->pid, thread->pid, fp->handle); | |
2206 | return -EINVAL; | |
2207 | } | |
52f88693 | 2208 | if (security_binder_transfer_binder(proc->cred, target_proc->cred)) { |
adc18842 TK |
2209 | ret = -EPERM; |
2210 | goto done; | |
2211 | } | |
a056af42 | 2212 | |
673068ee | 2213 | binder_node_lock(node); |
372e3147 | 2214 | if (node->proc == target_proc) { |
a056af42 MC |
2215 | if (fp->hdr.type == BINDER_TYPE_HANDLE) |
2216 | fp->hdr.type = BINDER_TYPE_BINDER; | |
2217 | else | |
2218 | fp->hdr.type = BINDER_TYPE_WEAK_BINDER; | |
372e3147 TK |
2219 | fp->binder = node->ptr; |
2220 | fp->cookie = node->cookie; | |
673068ee TK |
2221 | if (node->proc) |
2222 | binder_inner_proc_lock(node->proc); | |
324fa64c TK |
2223 | else |
2224 | __acquire(&node->proc->inner_lock); | |
673068ee TK |
2225 | binder_inc_node_nilocked(node, |
2226 | fp->hdr.type == BINDER_TYPE_BINDER, | |
2227 | 0, NULL); | |
2228 | if (node->proc) | |
2229 | binder_inner_proc_unlock(node->proc); | |
324fa64c TK |
2230 | else |
2231 | __release(&node->proc->inner_lock); | |
372e3147 | 2232 | trace_binder_transaction_ref_to_node(t, node, &src_rdata); |
a056af42 MC |
2233 | binder_debug(BINDER_DEBUG_TRANSACTION, |
2234 | " ref %d desc %d -> node %d u%016llx\n", | |
372e3147 TK |
2235 | src_rdata.debug_id, src_rdata.desc, node->debug_id, |
2236 | (u64)node->ptr); | |
673068ee | 2237 | binder_node_unlock(node); |
a056af42 | 2238 | } else { |
372e3147 | 2239 | struct binder_ref_data dest_rdata; |
a056af42 | 2240 | |
673068ee | 2241 | binder_node_unlock(node); |
372e3147 TK |
2242 | ret = binder_inc_ref_for_node(target_proc, node, |
2243 | fp->hdr.type == BINDER_TYPE_HANDLE, | |
2244 | NULL, &dest_rdata); | |
2245 | if (ret) | |
adc18842 | 2246 | goto done; |
a056af42 MC |
2247 | |
2248 | fp->binder = 0; | |
372e3147 | 2249 | fp->handle = dest_rdata.desc; |
a056af42 | 2250 | fp->cookie = 0; |
372e3147 TK |
2251 | trace_binder_transaction_ref_to_ref(t, node, &src_rdata, |
2252 | &dest_rdata); | |
a056af42 MC |
2253 | binder_debug(BINDER_DEBUG_TRANSACTION, |
2254 | " ref %d desc %d -> ref %d desc %d (node %d)\n", | |
372e3147 TK |
2255 | src_rdata.debug_id, src_rdata.desc, |
2256 | dest_rdata.debug_id, dest_rdata.desc, | |
2257 | node->debug_id); | |
a056af42 | 2258 | } |
adc18842 TK |
2259 | done: |
2260 | binder_put_node(node); | |
2261 | return ret; | |
a056af42 MC |
2262 | } |
2263 | ||
8ced0c62 | 2264 | static int binder_translate_fd(u32 fd, binder_size_t fd_offset, |
a056af42 MC |
2265 | struct binder_transaction *t, |
2266 | struct binder_thread *thread, | |
2267 | struct binder_transaction *in_reply_to) | |
2268 | { | |
2269 | struct binder_proc *proc = thread->proc; | |
2270 | struct binder_proc *target_proc = t->to_proc; | |
44d8047f | 2271 | struct binder_txn_fd_fixup *fixup; |
a056af42 | 2272 | struct file *file; |
44d8047f | 2273 | int ret = 0; |
a056af42 MC |
2274 | bool target_allows_fd; |
2275 | ||
2276 | if (in_reply_to) | |
2277 | target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS); | |
2278 | else | |
2279 | target_allows_fd = t->buffer->target_node->accept_fds; | |
2280 | if (!target_allows_fd) { | |
2281 | binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n", | |
2282 | proc->pid, thread->pid, | |
2283 | in_reply_to ? "reply" : "transaction", | |
2284 | fd); | |
2285 | ret = -EPERM; | |
2286 | goto err_fd_not_accepted; | |
2287 | } | |
2288 | ||
2289 | file = fget(fd); | |
2290 | if (!file) { | |
2291 | binder_user_error("%d:%d got transaction with invalid fd, %d\n", | |
2292 | proc->pid, thread->pid, fd); | |
2293 | ret = -EBADF; | |
2294 | goto err_fget; | |
2295 | } | |
52f88693 | 2296 | ret = security_binder_transfer_file(proc->cred, target_proc->cred, file); |
a056af42 MC |
2297 | if (ret < 0) { |
2298 | ret = -EPERM; | |
2299 | goto err_security; | |
2300 | } | |
2301 | ||
44d8047f TK |
2302 | /* |
2303 | * Add fixup record for this transaction. The allocation | |
2304 | * of the fd in the target needs to be done from a | |
2305 | * target thread. | |
2306 | */ | |
2307 | fixup = kzalloc(sizeof(*fixup), GFP_KERNEL); | |
2308 | if (!fixup) { | |
a056af42 | 2309 | ret = -ENOMEM; |
44d8047f | 2310 | goto err_alloc; |
a056af42 | 2311 | } |
44d8047f | 2312 | fixup->file = file; |
8ced0c62 | 2313 | fixup->offset = fd_offset; |
a8a570c6 | 2314 | fixup->target_fd = -1; |
44d8047f TK |
2315 | trace_binder_transaction_fd_send(t, fd, fixup->offset); |
2316 | list_add_tail(&fixup->fixup_entry, &t->fd_fixups); | |
a056af42 | 2317 | |
44d8047f | 2318 | return ret; |
a056af42 | 2319 | |
44d8047f | 2320 | err_alloc: |
a056af42 MC |
2321 | err_security: |
2322 | fput(file); | |
2323 | err_fget: | |
2324 | err_fd_not_accepted: | |
2325 | return ret; | |
2326 | } | |
2327 | ||
09184ae9 TK |
2328 | /** |
2329 | * struct binder_ptr_fixup - data to be fixed-up in target buffer | |
2330 | * @offset offset in target buffer to fixup | |
2331 | * @skip_size bytes to skip in copy (fixup will be written later) | |
2332 | * @fixup_data data to write at fixup offset | |
2333 | * @node list node | |
2334 | * | |
2335 | * This is used for the pointer fixup list (pf) which is created and consumed | |
2336 | * during binder_transaction() and is only accessed locally. No | |
2337 | * locking is necessary. | |
2338 | * | |
2339 | * The list is ordered by @offset. | |
2340 | */ | |
2341 | struct binder_ptr_fixup { | |
2342 | binder_size_t offset; | |
2343 | size_t skip_size; | |
2344 | binder_uintptr_t fixup_data; | |
2345 | struct list_head node; | |
2346 | }; | |
2347 | ||
2348 | /** | |
2349 | * struct binder_sg_copy - scatter-gather data to be copied | |
2350 | * @offset offset in target buffer | |
2351 | * @sender_uaddr user address in source buffer | |
2352 | * @length bytes to copy | |
2353 | * @node list node | |
2354 | * | |
2355 | * This is used for the sg copy list (sgc) which is created and consumed | |
2356 | * during binder_transaction() and is only accessed locally. No | |
2357 | * locking is necessary. | |
2358 | * | |
2359 | * The list is ordered by @offset. | |
2360 | */ | |
2361 | struct binder_sg_copy { | |
2362 | binder_size_t offset; | |
2363 | const void __user *sender_uaddr; | |
2364 | size_t length; | |
2365 | struct list_head node; | |
2366 | }; | |
2367 | ||
2368 | /** | |
2369 | * binder_do_deferred_txn_copies() - copy and fixup scatter-gather data | |
2370 | * @alloc: binder_alloc associated with @buffer | |
2371 | * @buffer: binder buffer in target process | |
2372 | * @sgc_head: list_head of scatter-gather copy list | |
2373 | * @pf_head: list_head of pointer fixup list | |
2374 | * | |
2375 | * Processes all elements of @sgc_head, applying fixups from @pf_head | |
2376 | * and copying the scatter-gather data from the source process' user | |
2377 | * buffer to the target's buffer. It is expected that the list creation | |
2378 | * and processing all occurs during binder_transaction() so these lists | |
2379 | * are only accessed in local context. | |
2380 | * | |
2381 | * Return: 0=success, else -errno | |
2382 | */ | |
2383 | static int binder_do_deferred_txn_copies(struct binder_alloc *alloc, | |
2384 | struct binder_buffer *buffer, | |
2385 | struct list_head *sgc_head, | |
2386 | struct list_head *pf_head) | |
2387 | { | |
2388 | int ret = 0; | |
2389 | struct binder_sg_copy *sgc, *tmpsgc; | |
2d1746e3 | 2390 | struct binder_ptr_fixup *tmppf; |
09184ae9 TK |
2391 | struct binder_ptr_fixup *pf = |
2392 | list_first_entry_or_null(pf_head, struct binder_ptr_fixup, | |
2393 | node); | |
2394 | ||
2395 | list_for_each_entry_safe(sgc, tmpsgc, sgc_head, node) { | |
2396 | size_t bytes_copied = 0; | |
2397 | ||
2398 | while (bytes_copied < sgc->length) { | |
2399 | size_t copy_size; | |
2400 | size_t bytes_left = sgc->length - bytes_copied; | |
2401 | size_t offset = sgc->offset + bytes_copied; | |
2402 | ||
2403 | /* | |
2404 | * We copy up to the fixup (pointed to by pf) | |
2405 | */ | |
2406 | copy_size = pf ? min(bytes_left, (size_t)pf->offset - offset) | |
2407 | : bytes_left; | |
2408 | if (!ret && copy_size) | |
2409 | ret = binder_alloc_copy_user_to_buffer( | |
2410 | alloc, buffer, | |
2411 | offset, | |
2412 | sgc->sender_uaddr + bytes_copied, | |
2413 | copy_size); | |
2414 | bytes_copied += copy_size; | |
2415 | if (copy_size != bytes_left) { | |
2416 | BUG_ON(!pf); | |
2417 | /* we stopped at a fixup offset */ | |
2418 | if (pf->skip_size) { | |
2419 | /* | |
2420 | * we are just skipping. This is for | |
2421 | * BINDER_TYPE_FDA where the translated | |
2422 | * fds will be fixed up when we get | |
2423 | * to target context. | |
2424 | */ | |
2425 | bytes_copied += pf->skip_size; | |
2426 | } else { | |
2427 | /* apply the fixup indicated by pf */ | |
2428 | if (!ret) | |
2429 | ret = binder_alloc_copy_to_buffer( | |
2430 | alloc, buffer, | |
2431 | pf->offset, | |
2432 | &pf->fixup_data, | |
2433 | sizeof(pf->fixup_data)); | |
2434 | bytes_copied += sizeof(pf->fixup_data); | |
2435 | } | |
2436 | list_del(&pf->node); | |
2437 | kfree(pf); | |
2438 | pf = list_first_entry_or_null(pf_head, | |
2439 | struct binder_ptr_fixup, node); | |
2440 | } | |
2441 | } | |
2442 | list_del(&sgc->node); | |
2443 | kfree(sgc); | |
2444 | } | |
2d1746e3 AA |
2445 | list_for_each_entry_safe(pf, tmppf, pf_head, node) { |
2446 | BUG_ON(pf->skip_size == 0); | |
2447 | list_del(&pf->node); | |
2448 | kfree(pf); | |
2449 | } | |
09184ae9 TK |
2450 | BUG_ON(!list_empty(sgc_head)); |
2451 | ||
2452 | return ret > 0 ? -EINVAL : ret; | |
2453 | } | |
2454 | ||
2455 | /** | |
2456 | * binder_cleanup_deferred_txn_lists() - free specified lists | |
2457 | * @sgc_head: list_head of scatter-gather copy list | |
2458 | * @pf_head: list_head of pointer fixup list | |
2459 | * | |
2460 | * Called to clean up @sgc_head and @pf_head if there is an | |
2461 | * error. | |
2462 | */ | |
2463 | static void binder_cleanup_deferred_txn_lists(struct list_head *sgc_head, | |
2464 | struct list_head *pf_head) | |
2465 | { | |
2466 | struct binder_sg_copy *sgc, *tmpsgc; | |
2467 | struct binder_ptr_fixup *pf, *tmppf; | |
2468 | ||
2469 | list_for_each_entry_safe(sgc, tmpsgc, sgc_head, node) { | |
2470 | list_del(&sgc->node); | |
2471 | kfree(sgc); | |
2472 | } | |
2473 | list_for_each_entry_safe(pf, tmppf, pf_head, node) { | |
2474 | list_del(&pf->node); | |
2475 | kfree(pf); | |
2476 | } | |
2477 | } | |
2478 | ||
2479 | /** | |
2480 | * binder_defer_copy() - queue a scatter-gather buffer for copy | |
2481 | * @sgc_head: list_head of scatter-gather copy list | |
2482 | * @offset: binder buffer offset in target process | |
2483 | * @sender_uaddr: user address in source process | |
2484 | * @length: bytes to copy | |
2485 | * | |
2486 | * Specify a scatter-gather block to be copied. The actual copy must | |
2487 | * be deferred until all the needed fixups are identified and queued. | |
2488 | * Then the copy and fixups are done together so un-translated values | |
2489 | * from the source are never visible in the target buffer. | |
2490 | * | |
2491 | * We are guaranteed that repeated calls to this function will have | |
2492 | * monotonically increasing @offset values so the list will naturally | |
2493 | * be ordered. | |
2494 | * | |
2495 | * Return: 0=success, else -errno | |
2496 | */ | |
2497 | static int binder_defer_copy(struct list_head *sgc_head, binder_size_t offset, | |
2498 | const void __user *sender_uaddr, size_t length) | |
2499 | { | |
2500 | struct binder_sg_copy *bc = kzalloc(sizeof(*bc), GFP_KERNEL); | |
2501 | ||
2502 | if (!bc) | |
2503 | return -ENOMEM; | |
2504 | ||
2505 | bc->offset = offset; | |
2506 | bc->sender_uaddr = sender_uaddr; | |
2507 | bc->length = length; | |
2508 | INIT_LIST_HEAD(&bc->node); | |
2509 | ||
2510 | /* | |
2511 | * We are guaranteed that the deferred copies are in-order | |
2512 | * so just add to the tail. | |
2513 | */ | |
2514 | list_add_tail(&bc->node, sgc_head); | |
2515 | ||
2516 | return 0; | |
2517 | } | |
2518 | ||
2519 | /** | |
2520 | * binder_add_fixup() - queue a fixup to be applied to sg copy | |
2521 | * @pf_head: list_head of binder ptr fixup list | |
2522 | * @offset: binder buffer offset in target process | |
2523 | * @fixup: bytes to be copied for fixup | |
2524 | * @skip_size: bytes to skip when copying (fixup will be applied later) | |
2525 | * | |
2526 | * Add the specified fixup to a list ordered by @offset. When copying | |
2527 | * the scatter-gather buffers, the fixup will be copied instead of | |
2528 | * data from the source buffer. For BINDER_TYPE_FDA fixups, the fixup | |
2529 | * will be applied later (in target process context), so we just skip | |
2530 | * the bytes specified by @skip_size. If @skip_size is 0, we copy the | |
2531 | * value in @fixup. | |
2532 | * | |
2533 | * This function is called *mostly* in @offset order, but there are | |
2534 | * exceptions. Since out-of-order inserts are relatively uncommon, | |
2535 | * we insert the new element by searching backward from the tail of | |
2536 | * the list. | |
2537 | * | |
2538 | * Return: 0=success, else -errno | |
2539 | */ | |
2540 | static int binder_add_fixup(struct list_head *pf_head, binder_size_t offset, | |
2541 | binder_uintptr_t fixup, size_t skip_size) | |
2542 | { | |
2543 | struct binder_ptr_fixup *pf = kzalloc(sizeof(*pf), GFP_KERNEL); | |
2544 | struct binder_ptr_fixup *tmppf; | |
2545 | ||
2546 | if (!pf) | |
2547 | return -ENOMEM; | |
2548 | ||
2549 | pf->offset = offset; | |
2550 | pf->fixup_data = fixup; | |
2551 | pf->skip_size = skip_size; | |
2552 | INIT_LIST_HEAD(&pf->node); | |
2553 | ||
2554 | /* Fixups are *mostly* added in-order, but there are some | |
2555 | * exceptions. Look backwards through list for insertion point. | |
2556 | */ | |
2557 | list_for_each_entry_reverse(tmppf, pf_head, node) { | |
2558 | if (tmppf->offset < pf->offset) { | |
2559 | list_add(&pf->node, &tmppf->node); | |
2560 | return 0; | |
2561 | } | |
2562 | } | |
2563 | /* | |
2564 | * if we get here, then the new offset is the lowest so | |
2565 | * insert at the head | |
2566 | */ | |
2567 | list_add(&pf->node, pf_head); | |
2568 | return 0; | |
2569 | } | |
2570 | ||
2571 | static int binder_translate_fd_array(struct list_head *pf_head, | |
2572 | struct binder_fd_array_object *fda, | |
656e01f3 | 2573 | const void __user *sender_ubuffer, |
def95c73 | 2574 | struct binder_buffer_object *parent, |
656e01f3 | 2575 | struct binder_buffer_object *sender_uparent, |
def95c73 MC |
2576 | struct binder_transaction *t, |
2577 | struct binder_thread *thread, | |
2578 | struct binder_transaction *in_reply_to) | |
2579 | { | |
44d8047f | 2580 | binder_size_t fdi, fd_buf_size; |
bde4a19f | 2581 | binder_size_t fda_offset; |
656e01f3 | 2582 | const void __user *sender_ufda_base; |
def95c73 | 2583 | struct binder_proc *proc = thread->proc; |
09184ae9 | 2584 | int ret; |
def95c73 | 2585 | |
ef38de92 AA |
2586 | if (fda->num_fds == 0) |
2587 | return 0; | |
2588 | ||
def95c73 MC |
2589 | fd_buf_size = sizeof(u32) * fda->num_fds; |
2590 | if (fda->num_fds >= SIZE_MAX / sizeof(u32)) { | |
2591 | binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n", | |
2592 | proc->pid, thread->pid, (u64)fda->num_fds); | |
2593 | return -EINVAL; | |
2594 | } | |
2595 | if (fd_buf_size > parent->length || | |
2596 | fda->parent_offset > parent->length - fd_buf_size) { | |
2597 | /* No space for all file descriptors here. */ | |
2598 | binder_user_error("%d:%d not enough space to store %lld fds in buffer\n", | |
2599 | proc->pid, thread->pid, (u64)fda->num_fds); | |
2600 | return -EINVAL; | |
2601 | } | |
bde4a19f TK |
2602 | /* |
2603 | * the source data for binder_buffer_object is visible | |
2604 | * to user-space and the @buffer element is the user | |
2605 | * pointer to the buffer_object containing the fd_array. | |
2606 | * Convert the address to an offset relative to | |
2607 | * the base of the transaction buffer. | |
2608 | */ | |
df9aabea | 2609 | fda_offset = parent->buffer - t->buffer->user_data + |
bde4a19f | 2610 | fda->parent_offset; |
9a0a930f AB |
2611 | sender_ufda_base = (void __user *)(uintptr_t)sender_uparent->buffer + |
2612 | fda->parent_offset; | |
656e01f3 TK |
2613 | |
2614 | if (!IS_ALIGNED((unsigned long)fda_offset, sizeof(u32)) || | |
2615 | !IS_ALIGNED((unsigned long)sender_ufda_base, sizeof(u32))) { | |
def95c73 MC |
2616 | binder_user_error("%d:%d parent offset not aligned correctly.\n", |
2617 | proc->pid, thread->pid); | |
2618 | return -EINVAL; | |
2619 | } | |
09184ae9 TK |
2620 | ret = binder_add_fixup(pf_head, fda_offset, 0, fda->num_fds * sizeof(u32)); |
2621 | if (ret) | |
2622 | return ret; | |
2623 | ||
def95c73 | 2624 | for (fdi = 0; fdi < fda->num_fds; fdi++) { |
8ced0c62 | 2625 | u32 fd; |
bde4a19f | 2626 | binder_size_t offset = fda_offset + fdi * sizeof(fd); |
656e01f3 | 2627 | binder_size_t sender_uoffset = fdi * sizeof(fd); |
8ced0c62 | 2628 | |
656e01f3 | 2629 | ret = copy_from_user(&fd, sender_ufda_base + sender_uoffset, sizeof(fd)); |
bb4a2e48 TK |
2630 | if (!ret) |
2631 | ret = binder_translate_fd(fd, offset, t, thread, | |
2632 | in_reply_to); | |
fe6b1869 TK |
2633 | if (ret) |
2634 | return ret > 0 ? -EINVAL : ret; | |
def95c73 MC |
2635 | } |
2636 | return 0; | |
def95c73 MC |
2637 | } |
2638 | ||
09184ae9 TK |
2639 | static int binder_fixup_parent(struct list_head *pf_head, |
2640 | struct binder_transaction *t, | |
7980240b MC |
2641 | struct binder_thread *thread, |
2642 | struct binder_buffer_object *bp, | |
db6b0b81 | 2643 | binder_size_t off_start_offset, |
7980240b | 2644 | binder_size_t num_valid, |
db6b0b81 | 2645 | binder_size_t last_fixup_obj_off, |
7980240b MC |
2646 | binder_size_t last_fixup_min_off) |
2647 | { | |
2648 | struct binder_buffer_object *parent; | |
7980240b MC |
2649 | struct binder_buffer *b = t->buffer; |
2650 | struct binder_proc *proc = thread->proc; | |
2651 | struct binder_proc *target_proc = t->to_proc; | |
db6b0b81 TK |
2652 | struct binder_object object; |
2653 | binder_size_t buffer_offset; | |
2654 | binder_size_t parent_offset; | |
7980240b MC |
2655 | |
2656 | if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT)) | |
2657 | return 0; | |
2658 | ||
db6b0b81 TK |
2659 | parent = binder_validate_ptr(target_proc, b, &object, bp->parent, |
2660 | off_start_offset, &parent_offset, | |
2661 | num_valid); | |
7980240b MC |
2662 | if (!parent) { |
2663 | binder_user_error("%d:%d got transaction with invalid parent offset or type\n", | |
2664 | proc->pid, thread->pid); | |
2665 | return -EINVAL; | |
2666 | } | |
2667 | ||
db6b0b81 TK |
2668 | if (!binder_validate_fixup(target_proc, b, off_start_offset, |
2669 | parent_offset, bp->parent_offset, | |
2670 | last_fixup_obj_off, | |
7980240b MC |
2671 | last_fixup_min_off)) { |
2672 | binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n", | |
2673 | proc->pid, thread->pid); | |
2674 | return -EINVAL; | |
2675 | } | |
2676 | ||
2677 | if (parent->length < sizeof(binder_uintptr_t) || | |
2678 | bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) { | |
2679 | /* No space for a pointer here! */ | |
2680 | binder_user_error("%d:%d got transaction with invalid parent offset\n", | |
2681 | proc->pid, thread->pid); | |
2682 | return -EINVAL; | |
2683 | } | |
df9aabea CL |
2684 | |
2685 | buffer_offset = bp->parent_offset + parent->buffer - b->user_data; | |
2686 | ||
09184ae9 | 2687 | return binder_add_fixup(pf_head, buffer_offset, bp->buffer, 0); |
7980240b MC |
2688 | } |
2689 | ||
9864bb48 LL |
2690 | /** |
2691 | * binder_can_update_transaction() - Can a txn be superseded by an updated one? | |
2692 | * @t1: the pending async txn in the frozen process | |
2693 | * @t2: the new async txn to supersede the outdated pending one | |
2694 | * | |
2695 | * Return: true if t2 can supersede t1 | |
2696 | * false if t2 can not supersede t1 | |
2697 | */ | |
2698 | static bool binder_can_update_transaction(struct binder_transaction *t1, | |
2699 | struct binder_transaction *t2) | |
2700 | { | |
2701 | if ((t1->flags & t2->flags & (TF_ONE_WAY | TF_UPDATE_TXN)) != | |
2702 | (TF_ONE_WAY | TF_UPDATE_TXN) || !t1->to_proc || !t2->to_proc) | |
2703 | return false; | |
2704 | if (t1->to_proc->tsk == t2->to_proc->tsk && t1->code == t2->code && | |
2705 | t1->flags == t2->flags && t1->buffer->pid == t2->buffer->pid && | |
2706 | t1->buffer->target_node->ptr == t2->buffer->target_node->ptr && | |
2707 | t1->buffer->target_node->cookie == t2->buffer->target_node->cookie) | |
2708 | return true; | |
2709 | return false; | |
2710 | } | |
2711 | ||
2712 | /** | |
2713 | * binder_find_outdated_transaction_ilocked() - Find the outdated transaction | |
2714 | * @t: new async transaction | |
2715 | * @target_list: list to find outdated transaction | |
2716 | * | |
2717 | * Return: the outdated transaction if found | |
2718 | * NULL if no outdated transacton can be found | |
2719 | * | |
2720 | * Requires the proc->inner_lock to be held. | |
2721 | */ | |
2722 | static struct binder_transaction * | |
2723 | binder_find_outdated_transaction_ilocked(struct binder_transaction *t, | |
2724 | struct list_head *target_list) | |
2725 | { | |
2726 | struct binder_work *w; | |
2727 | ||
2728 | list_for_each_entry(w, target_list, entry) { | |
2729 | struct binder_transaction *t_queued; | |
2730 | ||
2731 | if (w->type != BINDER_WORK_TRANSACTION) | |
2732 | continue; | |
2733 | t_queued = container_of(w, struct binder_transaction, work); | |
2734 | if (binder_can_update_transaction(t_queued, t)) | |
2735 | return t_queued; | |
2736 | } | |
2737 | return NULL; | |
2738 | } | |
2739 | ||
408c68b1 MC |
2740 | /** |
2741 | * binder_proc_transaction() - sends a transaction to a process and wakes it up | |
2742 | * @t: transaction to send | |
2743 | * @proc: process to send the transaction to | |
2744 | * @thread: thread in @proc to send the transaction to (may be NULL) | |
2745 | * | |
2746 | * This function queues a transaction to the specified process. It will try | |
2747 | * to find a thread in the target process to handle the transaction and | |
2748 | * wake it up. If no thread is found, the work is queued to the proc | |
2749 | * waitqueue. | |
2750 | * | |
2751 | * If the @thread parameter is not NULL, the transaction is always queued | |
2752 | * to the waitlist of that specific thread. | |
2753 | * | |
432ff1e9 MB |
2754 | * Return: 0 if the transaction was successfully queued |
2755 | * BR_DEAD_REPLY if the target process or thread is dead | |
0567461a LL |
2756 | * BR_FROZEN_REPLY if the target process or thread is frozen and |
2757 | * the sync transaction was rejected | |
2758 | * BR_TRANSACTION_PENDING_FROZEN if the target process is frozen | |
2759 | * and the async transaction was successfully queued | |
408c68b1 | 2760 | */ |
432ff1e9 | 2761 | static int binder_proc_transaction(struct binder_transaction *t, |
408c68b1 MC |
2762 | struct binder_proc *proc, |
2763 | struct binder_thread *thread) | |
2764 | { | |
408c68b1 MC |
2765 | struct binder_node *node = t->buffer->target_node; |
2766 | bool oneway = !!(t->flags & TF_ONE_WAY); | |
148ade2c | 2767 | bool pending_async = false; |
9864bb48 | 2768 | struct binder_transaction *t_outdated = NULL; |
0567461a | 2769 | bool frozen = false; |
408c68b1 MC |
2770 | |
2771 | BUG_ON(!node); | |
2772 | binder_node_lock(node); | |
2773 | if (oneway) { | |
2774 | BUG_ON(thread); | |
8df5b949 | 2775 | if (node->has_async_transaction) |
148ade2c | 2776 | pending_async = true; |
8df5b949 | 2777 | else |
197410ad | 2778 | node->has_async_transaction = true; |
408c68b1 MC |
2779 | } |
2780 | ||
2781 | binder_inner_proc_lock(proc); | |
ae28c1be | 2782 | if (proc->is_frozen) { |
0567461a | 2783 | frozen = true; |
ae28c1be MB |
2784 | proc->sync_recv |= !oneway; |
2785 | proc->async_recv |= oneway; | |
2786 | } | |
408c68b1 | 2787 | |
0567461a | 2788 | if ((frozen && !oneway) || proc->is_dead || |
432ff1e9 | 2789 | (thread && thread->is_dead)) { |
408c68b1 MC |
2790 | binder_inner_proc_unlock(proc); |
2791 | binder_node_unlock(node); | |
0567461a | 2792 | return frozen ? BR_FROZEN_REPLY : BR_DEAD_REPLY; |
408c68b1 MC |
2793 | } |
2794 | ||
148ade2c | 2795 | if (!thread && !pending_async) |
408c68b1 MC |
2796 | thread = binder_select_thread_ilocked(proc); |
2797 | ||
9864bb48 | 2798 | if (thread) { |
148ade2c | 2799 | binder_enqueue_thread_work_ilocked(thread, &t->work); |
9864bb48 | 2800 | } else if (!pending_async) { |
148ade2c | 2801 | binder_enqueue_work_ilocked(&t->work, &proc->todo); |
9864bb48 | 2802 | } else { |
0567461a | 2803 | if ((t->flags & TF_UPDATE_TXN) && frozen) { |
9864bb48 LL |
2804 | t_outdated = binder_find_outdated_transaction_ilocked(t, |
2805 | &node->async_todo); | |
2806 | if (t_outdated) { | |
2807 | binder_debug(BINDER_DEBUG_TRANSACTION, | |
2808 | "txn %d supersedes %d\n", | |
2809 | t->debug_id, t_outdated->debug_id); | |
2810 | list_del_init(&t_outdated->work.entry); | |
2811 | proc->outstanding_txns--; | |
2812 | } | |
2813 | } | |
148ade2c | 2814 | binder_enqueue_work_ilocked(&t->work, &node->async_todo); |
9864bb48 | 2815 | } |
408c68b1 | 2816 | |
148ade2c | 2817 | if (!pending_async) |
408c68b1 MC |
2818 | binder_wakeup_thread_ilocked(proc, thread, !oneway /* sync */); |
2819 | ||
432ff1e9 | 2820 | proc->outstanding_txns++; |
408c68b1 MC |
2821 | binder_inner_proc_unlock(proc); |
2822 | binder_node_unlock(node); | |
2823 | ||
9864bb48 LL |
2824 | /* |
2825 | * To reduce potential contention, free the outdated transaction and | |
2826 | * buffer after releasing the locks. | |
2827 | */ | |
2828 | if (t_outdated) { | |
2829 | struct binder_buffer *buffer = t_outdated->buffer; | |
2830 | ||
2831 | t_outdated->buffer = NULL; | |
2832 | buffer->transaction = NULL; | |
2833 | trace_binder_transaction_update_buffer_release(buffer); | |
bdc1c5fa | 2834 | binder_release_entire_buffer(proc, NULL, buffer, false); |
9864bb48 LL |
2835 | binder_alloc_free_buf(&proc->alloc, buffer); |
2836 | kfree(t_outdated); | |
2837 | binder_stats_deleted(BINDER_STAT_TRANSACTION); | |
2838 | } | |
2839 | ||
0567461a LL |
2840 | if (oneway && frozen) |
2841 | return BR_TRANSACTION_PENDING_FROZEN; | |
2842 | ||
432ff1e9 | 2843 | return 0; |
408c68b1 MC |
2844 | } |
2845 | ||
512cf465 TK |
2846 | /** |
2847 | * binder_get_node_refs_for_txn() - Get required refs on node for txn | |
2848 | * @node: struct binder_node for which to get refs | |
ad228a34 RD |
2849 | * @procp: returns @node->proc if valid |
2850 | * @error: if no @procp then returns BR_DEAD_REPLY | |
512cf465 TK |
2851 | * |
2852 | * User-space normally keeps the node alive when creating a transaction | |
2853 | * since it has a reference to the target. The local strong ref keeps it | |
2854 | * alive if the sending process dies before the target process processes | |
2855 | * the transaction. If the source process is malicious or has a reference | |
2856 | * counting bug, relying on the local strong ref can fail. | |
2857 | * | |
2858 | * Since user-space can cause the local strong ref to go away, we also take | |
2859 | * a tmpref on the node to ensure it survives while we are constructing | |
2860 | * the transaction. We also need a tmpref on the proc while we are | |
2861 | * constructing the transaction, so we take that here as well. | |
2862 | * | |
2863 | * Return: The target_node with refs taken or NULL if no @node->proc is NULL. | |
ad228a34 RD |
2864 | * Also sets @procp if valid. If the @node->proc is NULL indicating that the |
2865 | * target proc has died, @error is set to BR_DEAD_REPLY. | |
512cf465 TK |
2866 | */ |
2867 | static struct binder_node *binder_get_node_refs_for_txn( | |
2868 | struct binder_node *node, | |
2869 | struct binder_proc **procp, | |
2870 | uint32_t *error) | |
2871 | { | |
2872 | struct binder_node *target_node = NULL; | |
2873 | ||
2874 | binder_node_inner_lock(node); | |
2875 | if (node->proc) { | |
2876 | target_node = node; | |
2877 | binder_inc_node_nilocked(node, 1, 0, NULL); | |
2878 | binder_inc_node_tmpref_ilocked(node); | |
2879 | node->proc->tmp_ref++; | |
2880 | *procp = node->proc; | |
2881 | } else | |
2882 | *error = BR_DEAD_REPLY; | |
2883 | binder_node_inner_unlock(node); | |
2884 | ||
2885 | return target_node; | |
2886 | } | |
2887 | ||
bd32889e CL |
2888 | static void binder_set_txn_from_error(struct binder_transaction *t, int id, |
2889 | uint32_t command, int32_t param) | |
2890 | { | |
2891 | struct binder_thread *from = binder_get_txn_from_and_acq_inner(t); | |
2892 | ||
2893 | if (!from) { | |
2894 | /* annotation for sparse */ | |
2895 | __release(&from->proc->inner_lock); | |
2896 | return; | |
2897 | } | |
2898 | ||
2899 | /* don't override existing errors */ | |
2900 | if (from->ee.command == BR_OK) | |
2901 | binder_set_extended_error(&from->ee, id, command, param); | |
2902 | binder_inner_proc_unlock(from->proc); | |
2903 | binder_thread_dec_tmpref(from); | |
2904 | } | |
2905 | ||
355b0502 GKH |
2906 | static void binder_transaction(struct binder_proc *proc, |
2907 | struct binder_thread *thread, | |
4bfac80a MC |
2908 | struct binder_transaction_data *tr, int reply, |
2909 | binder_size_t extra_buffers_size) | |
355b0502 | 2910 | { |
a056af42 | 2911 | int ret; |
355b0502 | 2912 | struct binder_transaction *t; |
44b73962 | 2913 | struct binder_work *w; |
355b0502 | 2914 | struct binder_work *tcomplete; |
bde4a19f TK |
2915 | binder_size_t buffer_offset = 0; |
2916 | binder_size_t off_start_offset, off_end_offset; | |
212265e5 | 2917 | binder_size_t off_min; |
bde4a19f | 2918 | binder_size_t sg_buf_offset, sg_buf_end_offset; |
6d98eb95 | 2919 | binder_size_t user_offset = 0; |
7a4408c6 | 2920 | struct binder_proc *target_proc = NULL; |
355b0502 GKH |
2921 | struct binder_thread *target_thread = NULL; |
2922 | struct binder_node *target_node = NULL; | |
355b0502 GKH |
2923 | struct binder_transaction *in_reply_to = NULL; |
2924 | struct binder_transaction_log_entry *e; | |
57ada2fb TK |
2925 | uint32_t return_error = 0; |
2926 | uint32_t return_error_param = 0; | |
2927 | uint32_t return_error_line = 0; | |
db6b0b81 | 2928 | binder_size_t last_fixup_obj_off = 0; |
7980240b | 2929 | binder_size_t last_fixup_min_off = 0; |
342e5c90 | 2930 | struct binder_context *context = proc->context; |
d99c7333 | 2931 | int t_debug_id = atomic_inc_return(&binder_last_id); |
80093619 | 2932 | ktime_t t_start_time = ktime_get(); |
ec74136d TK |
2933 | char *secctx = NULL; |
2934 | u32 secctx_sz = 0; | |
09184ae9 TK |
2935 | struct list_head sgc_head; |
2936 | struct list_head pf_head; | |
6d98eb95 TK |
2937 | const void __user *user_buffer = (const void __user *) |
2938 | (uintptr_t)tr->data.ptr.buffer; | |
09184ae9 TK |
2939 | INIT_LIST_HEAD(&sgc_head); |
2940 | INIT_LIST_HEAD(&pf_head); | |
355b0502 GKH |
2941 | |
2942 | e = binder_transaction_log_add(&binder_transaction_log); | |
d99c7333 | 2943 | e->debug_id = t_debug_id; |
355b0502 GKH |
2944 | e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY); |
2945 | e->from_proc = proc->pid; | |
2946 | e->from_thread = thread->pid; | |
2947 | e->target_handle = tr->target.handle; | |
2948 | e->data_size = tr->data_size; | |
2949 | e->offsets_size = tr->offsets_size; | |
51d8a7ec | 2950 | strscpy(e->context_name, proc->context->name, BINDERFS_MAX_NAME); |
355b0502 | 2951 | |
bd32889e CL |
2952 | binder_inner_proc_lock(proc); |
2953 | binder_set_extended_error(&thread->ee, t_debug_id, BR_OK, 0); | |
2954 | binder_inner_proc_unlock(proc); | |
2955 | ||
355b0502 | 2956 | if (reply) { |
0b89d69a | 2957 | binder_inner_proc_lock(proc); |
355b0502 GKH |
2958 | in_reply_to = thread->transaction_stack; |
2959 | if (in_reply_to == NULL) { | |
0b89d69a | 2960 | binder_inner_proc_unlock(proc); |
56b468fc | 2961 | binder_user_error("%d:%d got reply transaction with no transaction stack\n", |
355b0502 GKH |
2962 | proc->pid, thread->pid); |
2963 | return_error = BR_FAILED_REPLY; | |
57ada2fb TK |
2964 | return_error_param = -EPROTO; |
2965 | return_error_line = __LINE__; | |
355b0502 GKH |
2966 | goto err_empty_call_stack; |
2967 | } | |
355b0502 | 2968 | if (in_reply_to->to_thread != thread) { |
7a4408c6 | 2969 | spin_lock(&in_reply_to->lock); |
56b468fc | 2970 | binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n", |
355b0502 GKH |
2971 | proc->pid, thread->pid, in_reply_to->debug_id, |
2972 | in_reply_to->to_proc ? | |
2973 | in_reply_to->to_proc->pid : 0, | |
2974 | in_reply_to->to_thread ? | |
2975 | in_reply_to->to_thread->pid : 0); | |
7a4408c6 | 2976 | spin_unlock(&in_reply_to->lock); |
0b89d69a | 2977 | binder_inner_proc_unlock(proc); |
355b0502 | 2978 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
2979 | return_error_param = -EPROTO; |
2980 | return_error_line = __LINE__; | |
355b0502 GKH |
2981 | in_reply_to = NULL; |
2982 | goto err_bad_call_stack; | |
2983 | } | |
2984 | thread->transaction_stack = in_reply_to->to_parent; | |
0b89d69a MC |
2985 | binder_inner_proc_unlock(proc); |
2986 | binder_set_nice(in_reply_to->saved_priority); | |
2987 | target_thread = binder_get_txn_from_and_acq_inner(in_reply_to); | |
355b0502 | 2988 | if (target_thread == NULL) { |
324fa64c TK |
2989 | /* annotation for sparse */ |
2990 | __release(&target_thread->proc->inner_lock); | |
a15dac8b CL |
2991 | binder_txn_error("%d:%d reply target not found\n", |
2992 | thread->pid, proc->pid); | |
355b0502 | 2993 | return_error = BR_DEAD_REPLY; |
57ada2fb | 2994 | return_error_line = __LINE__; |
355b0502 GKH |
2995 | goto err_dead_binder; |
2996 | } | |
2997 | if (target_thread->transaction_stack != in_reply_to) { | |
56b468fc | 2998 | binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n", |
355b0502 GKH |
2999 | proc->pid, thread->pid, |
3000 | target_thread->transaction_stack ? | |
3001 | target_thread->transaction_stack->debug_id : 0, | |
3002 | in_reply_to->debug_id); | |
0b89d69a | 3003 | binder_inner_proc_unlock(target_thread->proc); |
355b0502 | 3004 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3005 | return_error_param = -EPROTO; |
3006 | return_error_line = __LINE__; | |
355b0502 GKH |
3007 | in_reply_to = NULL; |
3008 | target_thread = NULL; | |
3009 | goto err_dead_binder; | |
3010 | } | |
3011 | target_proc = target_thread->proc; | |
7a4408c6 | 3012 | target_proc->tmp_ref++; |
0b89d69a | 3013 | binder_inner_proc_unlock(target_thread->proc); |
355b0502 GKH |
3014 | } else { |
3015 | if (tr->target.handle) { | |
3016 | struct binder_ref *ref; | |
10f62861 | 3017 | |
eb34983b TK |
3018 | /* |
3019 | * There must already be a strong ref | |
3020 | * on this node. If so, do a strong | |
3021 | * increment on the node to ensure it | |
3022 | * stays alive until the transaction is | |
3023 | * done. | |
3024 | */ | |
2c1838dc TK |
3025 | binder_proc_lock(proc); |
3026 | ref = binder_get_ref_olocked(proc, tr->target.handle, | |
3027 | true); | |
eb34983b | 3028 | if (ref) { |
512cf465 TK |
3029 | target_node = binder_get_node_refs_for_txn( |
3030 | ref->node, &target_proc, | |
3031 | &return_error); | |
3032 | } else { | |
1ae14df5 RJ |
3033 | binder_user_error("%d:%d got transaction to invalid handle, %u\n", |
3034 | proc->pid, thread->pid, tr->target.handle); | |
355b0502 | 3035 | return_error = BR_FAILED_REPLY; |
355b0502 | 3036 | } |
512cf465 | 3037 | binder_proc_unlock(proc); |
355b0502 | 3038 | } else { |
c44b1231 | 3039 | mutex_lock(&context->context_mgr_node_lock); |
342e5c90 | 3040 | target_node = context->binder_context_mgr_node; |
512cf465 TK |
3041 | if (target_node) |
3042 | target_node = binder_get_node_refs_for_txn( | |
3043 | target_node, &target_proc, | |
3044 | &return_error); | |
3045 | else | |
355b0502 | 3046 | return_error = BR_DEAD_REPLY; |
c44b1231 | 3047 | mutex_unlock(&context->context_mgr_node_lock); |
49ed9694 | 3048 | if (target_node && target_proc->pid == proc->pid) { |
7aa135fc MC |
3049 | binder_user_error("%d:%d got transaction to context manager from process owning it\n", |
3050 | proc->pid, thread->pid); | |
3051 | return_error = BR_FAILED_REPLY; | |
3052 | return_error_param = -EINVAL; | |
3053 | return_error_line = __LINE__; | |
3054 | goto err_invalid_target_handle; | |
3055 | } | |
355b0502 | 3056 | } |
512cf465 | 3057 | if (!target_node) { |
a15dac8b CL |
3058 | binder_txn_error("%d:%d cannot find target node\n", |
3059 | thread->pid, proc->pid); | |
512cf465 TK |
3060 | /* |
3061 | * return_error is set above | |
3062 | */ | |
3063 | return_error_param = -EINVAL; | |
57ada2fb | 3064 | return_error_line = __LINE__; |
355b0502 GKH |
3065 | goto err_dead_binder; |
3066 | } | |
512cf465 | 3067 | e->to_node = target_node->debug_id; |
4b836a14 | 3068 | if (WARN_ON(proc == target_proc)) { |
a15dac8b CL |
3069 | binder_txn_error("%d:%d self transactions not allowed\n", |
3070 | thread->pid, proc->pid); | |
4b836a14 JH |
3071 | return_error = BR_FAILED_REPLY; |
3072 | return_error_param = -EINVAL; | |
3073 | return_error_line = __LINE__; | |
3074 | goto err_invalid_target_handle; | |
3075 | } | |
52f88693 TK |
3076 | if (security_binder_transaction(proc->cred, |
3077 | target_proc->cred) < 0) { | |
a15dac8b CL |
3078 | binder_txn_error("%d:%d transaction credentials failed\n", |
3079 | thread->pid, proc->pid); | |
79af7307 | 3080 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3081 | return_error_param = -EPERM; |
3082 | return_error_line = __LINE__; | |
79af7307 SS |
3083 | goto err_invalid_target_handle; |
3084 | } | |
0b89d69a | 3085 | binder_inner_proc_lock(proc); |
44b73962 SY |
3086 | |
3087 | w = list_first_entry_or_null(&thread->todo, | |
3088 | struct binder_work, entry); | |
3089 | if (!(tr->flags & TF_ONE_WAY) && w && | |
3090 | w->type == BINDER_WORK_TRANSACTION) { | |
3091 | /* | |
3092 | * Do not allow new outgoing transaction from a | |
3093 | * thread that has a transaction at the head of | |
3094 | * its todo list. Only need to check the head | |
3095 | * because binder_select_thread_ilocked picks a | |
3096 | * thread from proc->waiting_threads to enqueue | |
3097 | * the transaction, and nothing is queued to the | |
3098 | * todo list while the thread is on waiting_threads. | |
3099 | */ | |
3100 | binder_user_error("%d:%d new transaction not allowed when there is a transaction on thread todo\n", | |
3101 | proc->pid, thread->pid); | |
3102 | binder_inner_proc_unlock(proc); | |
3103 | return_error = BR_FAILED_REPLY; | |
3104 | return_error_param = -EPROTO; | |
3105 | return_error_line = __LINE__; | |
3106 | goto err_bad_todo_list; | |
3107 | } | |
3108 | ||
355b0502 GKH |
3109 | if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) { |
3110 | struct binder_transaction *tmp; | |
10f62861 | 3111 | |
355b0502 GKH |
3112 | tmp = thread->transaction_stack; |
3113 | if (tmp->to_thread != thread) { | |
7a4408c6 | 3114 | spin_lock(&tmp->lock); |
56b468fc | 3115 | binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n", |
355b0502 GKH |
3116 | proc->pid, thread->pid, tmp->debug_id, |
3117 | tmp->to_proc ? tmp->to_proc->pid : 0, | |
3118 | tmp->to_thread ? | |
3119 | tmp->to_thread->pid : 0); | |
7a4408c6 | 3120 | spin_unlock(&tmp->lock); |
0b89d69a | 3121 | binder_inner_proc_unlock(proc); |
355b0502 | 3122 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3123 | return_error_param = -EPROTO; |
3124 | return_error_line = __LINE__; | |
355b0502 GKH |
3125 | goto err_bad_call_stack; |
3126 | } | |
3127 | while (tmp) { | |
7a4408c6 TK |
3128 | struct binder_thread *from; |
3129 | ||
3130 | spin_lock(&tmp->lock); | |
3131 | from = tmp->from; | |
3132 | if (from && from->proc == target_proc) { | |
3133 | atomic_inc(&from->tmp_ref); | |
3134 | target_thread = from; | |
3135 | spin_unlock(&tmp->lock); | |
3136 | break; | |
3137 | } | |
3138 | spin_unlock(&tmp->lock); | |
355b0502 GKH |
3139 | tmp = tmp->from_parent; |
3140 | } | |
3141 | } | |
0b89d69a | 3142 | binder_inner_proc_unlock(proc); |
355b0502 | 3143 | } |
408c68b1 | 3144 | if (target_thread) |
355b0502 | 3145 | e->to_thread = target_thread->pid; |
355b0502 GKH |
3146 | e->to_proc = target_proc->pid; |
3147 | ||
3148 | /* TODO: reuse incoming transaction for reply */ | |
3149 | t = kzalloc(sizeof(*t), GFP_KERNEL); | |
3150 | if (t == NULL) { | |
a15dac8b CL |
3151 | binder_txn_error("%d:%d cannot allocate transaction\n", |
3152 | thread->pid, proc->pid); | |
355b0502 | 3153 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3154 | return_error_param = -ENOMEM; |
3155 | return_error_line = __LINE__; | |
355b0502 GKH |
3156 | goto err_alloc_t_failed; |
3157 | } | |
44d8047f | 3158 | INIT_LIST_HEAD(&t->fd_fixups); |
355b0502 | 3159 | binder_stats_created(BINDER_STAT_TRANSACTION); |
7a4408c6 | 3160 | spin_lock_init(&t->lock); |
355b0502 GKH |
3161 | |
3162 | tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL); | |
3163 | if (tcomplete == NULL) { | |
a15dac8b CL |
3164 | binder_txn_error("%d:%d cannot allocate work for transaction\n", |
3165 | thread->pid, proc->pid); | |
355b0502 | 3166 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3167 | return_error_param = -ENOMEM; |
3168 | return_error_line = __LINE__; | |
355b0502 GKH |
3169 | goto err_alloc_tcomplete_failed; |
3170 | } | |
3171 | binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE); | |
3172 | ||
d99c7333 | 3173 | t->debug_id = t_debug_id; |
80093619 | 3174 | t->start_time = t_start_time; |
355b0502 GKH |
3175 | |
3176 | if (reply) | |
3177 | binder_debug(BINDER_DEBUG_TRANSACTION, | |
4bfac80a | 3178 | "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n", |
355b0502 GKH |
3179 | proc->pid, thread->pid, t->debug_id, |
3180 | target_proc->pid, target_thread->pid, | |
da49889d AH |
3181 | (u64)tr->data.ptr.buffer, |
3182 | (u64)tr->data.ptr.offsets, | |
4bfac80a MC |
3183 | (u64)tr->data_size, (u64)tr->offsets_size, |
3184 | (u64)extra_buffers_size); | |
355b0502 GKH |
3185 | else |
3186 | binder_debug(BINDER_DEBUG_TRANSACTION, | |
4bfac80a | 3187 | "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n", |
355b0502 GKH |
3188 | proc->pid, thread->pid, t->debug_id, |
3189 | target_proc->pid, target_node->debug_id, | |
da49889d AH |
3190 | (u64)tr->data.ptr.buffer, |
3191 | (u64)tr->data.ptr.offsets, | |
4bfac80a MC |
3192 | (u64)tr->data_size, (u64)tr->offsets_size, |
3193 | (u64)extra_buffers_size); | |
355b0502 GKH |
3194 | |
3195 | if (!reply && !(tr->flags & TF_ONE_WAY)) | |
3196 | t->from = thread; | |
3197 | else | |
3198 | t->from = NULL; | |
c21c0f9a CZ |
3199 | t->from_pid = proc->pid; |
3200 | t->from_tid = thread->pid; | |
c21a80ca | 3201 | t->sender_euid = task_euid(proc->tsk); |
355b0502 GKH |
3202 | t->to_proc = target_proc; |
3203 | t->to_thread = target_thread; | |
3204 | t->code = tr->code; | |
3205 | t->flags = tr->flags; | |
3206 | t->priority = task_nice(current); | |
975a1ac9 | 3207 | |
ec74136d TK |
3208 | if (target_node && target_node->txn_security_ctx) { |
3209 | u32 secid; | |
0b050950 | 3210 | size_t added_size; |
ec74136d | 3211 | |
4d5b5539 | 3212 | security_cred_getsecid(proc->cred, &secid); |
ec74136d TK |
3213 | ret = security_secid_to_secctx(secid, &secctx, &secctx_sz); |
3214 | if (ret) { | |
a15dac8b CL |
3215 | binder_txn_error("%d:%d failed to get security context\n", |
3216 | thread->pid, proc->pid); | |
ec74136d TK |
3217 | return_error = BR_FAILED_REPLY; |
3218 | return_error_param = ret; | |
3219 | return_error_line = __LINE__; | |
3220 | goto err_get_secctx_failed; | |
3221 | } | |
0b050950 TK |
3222 | added_size = ALIGN(secctx_sz, sizeof(u64)); |
3223 | extra_buffers_size += added_size; | |
3224 | if (extra_buffers_size < added_size) { | |
a15dac8b CL |
3225 | binder_txn_error("%d:%d integer overflow of extra_buffers_size\n", |
3226 | thread->pid, proc->pid); | |
0b050950 | 3227 | return_error = BR_FAILED_REPLY; |
88f6c779 | 3228 | return_error_param = -EINVAL; |
0b050950 TK |
3229 | return_error_line = __LINE__; |
3230 | goto err_bad_extra_size; | |
3231 | } | |
ec74136d TK |
3232 | } |
3233 | ||
975a1ac9 AH |
3234 | trace_binder_transaction(reply, t, target_node); |
3235 | ||
19c98724 | 3236 | t->buffer = binder_alloc_new_buf(&target_proc->alloc, tr->data_size, |
4bfac80a | 3237 | tr->offsets_size, extra_buffers_size, |
89f71743 | 3238 | !reply && (t->flags & TF_ONE_WAY)); |
57ada2fb | 3239 | if (IS_ERR(t->buffer)) { |
a15dac8b CL |
3240 | char *s; |
3241 | ||
3242 | ret = PTR_ERR(t->buffer); | |
3243 | s = (ret == -ESRCH) ? ": vma cleared, target dead or dying" | |
3244 | : (ret == -ENOSPC) ? ": no space left" | |
3245 | : (ret == -ENOMEM) ? ": memory allocation failed" | |
3246 | : ""; | |
3247 | binder_txn_error("cannot allocate buffer%s", s); | |
3248 | ||
57ada2fb TK |
3249 | return_error_param = PTR_ERR(t->buffer); |
3250 | return_error = return_error_param == -ESRCH ? | |
3251 | BR_DEAD_REPLY : BR_FAILED_REPLY; | |
3252 | return_error_line = __LINE__; | |
3253 | t->buffer = NULL; | |
355b0502 GKH |
3254 | goto err_binder_alloc_buf_failed; |
3255 | } | |
ec74136d | 3256 | if (secctx) { |
bb4a2e48 | 3257 | int err; |
ec74136d TK |
3258 | size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) + |
3259 | ALIGN(tr->offsets_size, sizeof(void *)) + | |
3260 | ALIGN(extra_buffers_size, sizeof(void *)) - | |
3261 | ALIGN(secctx_sz, sizeof(u64)); | |
ec74136d | 3262 | |
df9aabea | 3263 | t->security_ctx = t->buffer->user_data + buf_offset; |
bb4a2e48 TK |
3264 | err = binder_alloc_copy_to_buffer(&target_proc->alloc, |
3265 | t->buffer, buf_offset, | |
3266 | secctx, secctx_sz); | |
3267 | if (err) { | |
3268 | t->security_ctx = 0; | |
3269 | WARN_ON(1); | |
3270 | } | |
ec74136d TK |
3271 | security_release_secctx(secctx, secctx_sz); |
3272 | secctx = NULL; | |
3273 | } | |
355b0502 GKH |
3274 | t->buffer->debug_id = t->debug_id; |
3275 | t->buffer->transaction = t; | |
3276 | t->buffer->target_node = target_node; | |
0f966cba | 3277 | t->buffer->clear_on_free = !!(t->flags & TF_CLEAR_BUF); |
975a1ac9 | 3278 | trace_binder_transaction_alloc_buf(t->buffer); |
355b0502 | 3279 | |
1a7c3d9b TK |
3280 | if (binder_alloc_copy_user_to_buffer( |
3281 | &target_proc->alloc, | |
3282 | t->buffer, | |
3283 | ALIGN(tr->data_size, sizeof(void *)), | |
3284 | (const void __user *) | |
3285 | (uintptr_t)tr->data.ptr.offsets, | |
3286 | tr->offsets_size)) { | |
56b468fc AS |
3287 | binder_user_error("%d:%d got transaction with invalid offsets ptr\n", |
3288 | proc->pid, thread->pid); | |
355b0502 | 3289 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3290 | return_error_param = -EFAULT; |
3291 | return_error_line = __LINE__; | |
355b0502 GKH |
3292 | goto err_copy_data_failed; |
3293 | } | |
da49889d AH |
3294 | if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) { |
3295 | binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n", | |
3296 | proc->pid, thread->pid, (u64)tr->offsets_size); | |
355b0502 | 3297 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3298 | return_error_param = -EINVAL; |
3299 | return_error_line = __LINE__; | |
355b0502 GKH |
3300 | goto err_bad_offset; |
3301 | } | |
7980240b MC |
3302 | if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) { |
3303 | binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n", | |
3304 | proc->pid, thread->pid, | |
3305 | (u64)extra_buffers_size); | |
3306 | return_error = BR_FAILED_REPLY; | |
57ada2fb TK |
3307 | return_error_param = -EINVAL; |
3308 | return_error_line = __LINE__; | |
7980240b MC |
3309 | goto err_bad_offset; |
3310 | } | |
bde4a19f TK |
3311 | off_start_offset = ALIGN(tr->data_size, sizeof(void *)); |
3312 | buffer_offset = off_start_offset; | |
3313 | off_end_offset = off_start_offset + tr->offsets_size; | |
3314 | sg_buf_offset = ALIGN(off_end_offset, sizeof(void *)); | |
a5658706 MC |
3315 | sg_buf_end_offset = sg_buf_offset + extra_buffers_size - |
3316 | ALIGN(secctx_sz, sizeof(u64)); | |
212265e5 | 3317 | off_min = 0; |
bde4a19f TK |
3318 | for (buffer_offset = off_start_offset; buffer_offset < off_end_offset; |
3319 | buffer_offset += sizeof(binder_size_t)) { | |
feba3900 | 3320 | struct binder_object_header *hdr; |
8ced0c62 | 3321 | size_t object_size; |
7a67a393 | 3322 | struct binder_object object; |
8ced0c62 | 3323 | binder_size_t object_offset; |
6d98eb95 | 3324 | binder_size_t copy_size; |
8ced0c62 | 3325 | |
bb4a2e48 TK |
3326 | if (binder_alloc_copy_from_buffer(&target_proc->alloc, |
3327 | &object_offset, | |
3328 | t->buffer, | |
3329 | buffer_offset, | |
3330 | sizeof(object_offset))) { | |
a15dac8b CL |
3331 | binder_txn_error("%d:%d copy offset from buffer failed\n", |
3332 | thread->pid, proc->pid); | |
bb4a2e48 TK |
3333 | return_error = BR_FAILED_REPLY; |
3334 | return_error_param = -EINVAL; | |
3335 | return_error_line = __LINE__; | |
3336 | goto err_bad_offset; | |
3337 | } | |
6d98eb95 TK |
3338 | |
3339 | /* | |
3340 | * Copy the source user buffer up to the next object | |
3341 | * that will be processed. | |
3342 | */ | |
3343 | copy_size = object_offset - user_offset; | |
3344 | if (copy_size && (user_offset > object_offset || | |
3345 | binder_alloc_copy_user_to_buffer( | |
3346 | &target_proc->alloc, | |
3347 | t->buffer, user_offset, | |
3348 | user_buffer + user_offset, | |
3349 | copy_size))) { | |
3350 | binder_user_error("%d:%d got transaction with invalid data ptr\n", | |
3351 | proc->pid, thread->pid); | |
3352 | return_error = BR_FAILED_REPLY; | |
3353 | return_error_param = -EFAULT; | |
3354 | return_error_line = __LINE__; | |
3355 | goto err_copy_data_failed; | |
3356 | } | |
3357 | object_size = binder_get_object(target_proc, user_buffer, | |
3358 | t->buffer, object_offset, &object); | |
8ced0c62 | 3359 | if (object_size == 0 || object_offset < off_min) { |
feba3900 | 3360 | binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n", |
8ced0c62 TK |
3361 | proc->pid, thread->pid, |
3362 | (u64)object_offset, | |
212265e5 | 3363 | (u64)off_min, |
feba3900 | 3364 | (u64)t->buffer->data_size); |
355b0502 | 3365 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3366 | return_error_param = -EINVAL; |
3367 | return_error_line = __LINE__; | |
355b0502 GKH |
3368 | goto err_bad_offset; |
3369 | } | |
6d98eb95 TK |
3370 | /* |
3371 | * Set offset to the next buffer fragment to be | |
3372 | * copied | |
3373 | */ | |
3374 | user_offset = object_offset + object_size; | |
feba3900 | 3375 | |
7a67a393 | 3376 | hdr = &object.hdr; |
8ced0c62 | 3377 | off_min = object_offset + object_size; |
feba3900 | 3378 | switch (hdr->type) { |
355b0502 GKH |
3379 | case BINDER_TYPE_BINDER: |
3380 | case BINDER_TYPE_WEAK_BINDER: { | |
feba3900 | 3381 | struct flat_binder_object *fp; |
10f62861 | 3382 | |
feba3900 | 3383 | fp = to_flat_binder_object(hdr); |
a056af42 | 3384 | ret = binder_translate_binder(fp, t, thread); |
bb4a2e48 TK |
3385 | |
3386 | if (ret < 0 || | |
3387 | binder_alloc_copy_to_buffer(&target_proc->alloc, | |
3388 | t->buffer, | |
3389 | object_offset, | |
3390 | fp, sizeof(*fp))) { | |
a15dac8b CL |
3391 | binder_txn_error("%d:%d translate binder failed\n", |
3392 | thread->pid, proc->pid); | |
355b0502 | 3393 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3394 | return_error_param = ret; |
3395 | return_error_line = __LINE__; | |
a056af42 | 3396 | goto err_translate_failed; |
355b0502 | 3397 | } |
355b0502 GKH |
3398 | } break; |
3399 | case BINDER_TYPE_HANDLE: | |
3400 | case BINDER_TYPE_WEAK_HANDLE: { | |
feba3900 | 3401 | struct flat_binder_object *fp; |
0a3ffab9 | 3402 | |
feba3900 | 3403 | fp = to_flat_binder_object(hdr); |
a056af42 | 3404 | ret = binder_translate_handle(fp, t, thread); |
bb4a2e48 TK |
3405 | if (ret < 0 || |
3406 | binder_alloc_copy_to_buffer(&target_proc->alloc, | |
3407 | t->buffer, | |
3408 | object_offset, | |
3409 | fp, sizeof(*fp))) { | |
a15dac8b CL |
3410 | binder_txn_error("%d:%d translate handle failed\n", |
3411 | thread->pid, proc->pid); | |
79af7307 | 3412 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3413 | return_error_param = ret; |
3414 | return_error_line = __LINE__; | |
a056af42 | 3415 | goto err_translate_failed; |
355b0502 GKH |
3416 | } |
3417 | } break; | |
3418 | ||
3419 | case BINDER_TYPE_FD: { | |
feba3900 | 3420 | struct binder_fd_object *fp = to_binder_fd_object(hdr); |
8ced0c62 TK |
3421 | binder_size_t fd_offset = object_offset + |
3422 | (uintptr_t)&fp->fd - (uintptr_t)fp; | |
3423 | int ret = binder_translate_fd(fp->fd, fd_offset, t, | |
3424 | thread, in_reply_to); | |
355b0502 | 3425 | |
bb4a2e48 TK |
3426 | fp->pad_binder = 0; |
3427 | if (ret < 0 || | |
3428 | binder_alloc_copy_to_buffer(&target_proc->alloc, | |
3429 | t->buffer, | |
3430 | object_offset, | |
3431 | fp, sizeof(*fp))) { | |
a15dac8b CL |
3432 | binder_txn_error("%d:%d translate fd failed\n", |
3433 | thread->pid, proc->pid); | |
355b0502 | 3434 | return_error = BR_FAILED_REPLY; |
44d8047f | 3435 | return_error_param = ret; |
57ada2fb | 3436 | return_error_line = __LINE__; |
a056af42 | 3437 | goto err_translate_failed; |
355b0502 | 3438 | } |
355b0502 | 3439 | } break; |
def95c73 | 3440 | case BINDER_TYPE_FDA: { |
db6b0b81 TK |
3441 | struct binder_object ptr_object; |
3442 | binder_size_t parent_offset; | |
656e01f3 TK |
3443 | struct binder_object user_object; |
3444 | size_t user_parent_size; | |
def95c73 MC |
3445 | struct binder_fd_array_object *fda = |
3446 | to_binder_fd_array_object(hdr); | |
16981742 | 3447 | size_t num_valid = (buffer_offset - off_start_offset) / |
bde4a19f | 3448 | sizeof(binder_size_t); |
def95c73 | 3449 | struct binder_buffer_object *parent = |
db6b0b81 TK |
3450 | binder_validate_ptr(target_proc, t->buffer, |
3451 | &ptr_object, fda->parent, | |
3452 | off_start_offset, | |
3453 | &parent_offset, | |
bde4a19f | 3454 | num_valid); |
def95c73 MC |
3455 | if (!parent) { |
3456 | binder_user_error("%d:%d got transaction with invalid parent offset or type\n", | |
3457 | proc->pid, thread->pid); | |
3458 | return_error = BR_FAILED_REPLY; | |
57ada2fb TK |
3459 | return_error_param = -EINVAL; |
3460 | return_error_line = __LINE__; | |
def95c73 MC |
3461 | goto err_bad_parent; |
3462 | } | |
db6b0b81 TK |
3463 | if (!binder_validate_fixup(target_proc, t->buffer, |
3464 | off_start_offset, | |
3465 | parent_offset, | |
3466 | fda->parent_offset, | |
3467 | last_fixup_obj_off, | |
def95c73 MC |
3468 | last_fixup_min_off)) { |
3469 | binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n", | |
3470 | proc->pid, thread->pid); | |
3471 | return_error = BR_FAILED_REPLY; | |
57ada2fb TK |
3472 | return_error_param = -EINVAL; |
3473 | return_error_line = __LINE__; | |
def95c73 MC |
3474 | goto err_bad_parent; |
3475 | } | |
656e01f3 TK |
3476 | /* |
3477 | * We need to read the user version of the parent | |
3478 | * object to get the original user offset | |
3479 | */ | |
3480 | user_parent_size = | |
3481 | binder_get_object(proc, user_buffer, t->buffer, | |
3482 | parent_offset, &user_object); | |
3483 | if (user_parent_size != sizeof(user_object.bbo)) { | |
3484 | binder_user_error("%d:%d invalid ptr object size: %zd vs %zd\n", | |
3485 | proc->pid, thread->pid, | |
3486 | user_parent_size, | |
3487 | sizeof(user_object.bbo)); | |
3488 | return_error = BR_FAILED_REPLY; | |
3489 | return_error_param = -EINVAL; | |
3490 | return_error_line = __LINE__; | |
3491 | goto err_bad_parent; | |
3492 | } | |
09184ae9 TK |
3493 | ret = binder_translate_fd_array(&pf_head, fda, |
3494 | user_buffer, parent, | |
656e01f3 TK |
3495 | &user_object.bbo, t, |
3496 | thread, in_reply_to); | |
6d98eb95 TK |
3497 | if (!ret) |
3498 | ret = binder_alloc_copy_to_buffer(&target_proc->alloc, | |
3499 | t->buffer, | |
3500 | object_offset, | |
3501 | fda, sizeof(*fda)); | |
3502 | if (ret) { | |
a15dac8b CL |
3503 | binder_txn_error("%d:%d translate fd array failed\n", |
3504 | thread->pid, proc->pid); | |
def95c73 | 3505 | return_error = BR_FAILED_REPLY; |
6d98eb95 | 3506 | return_error_param = ret > 0 ? -EINVAL : ret; |
57ada2fb | 3507 | return_error_line = __LINE__; |
def95c73 MC |
3508 | goto err_translate_failed; |
3509 | } | |
db6b0b81 | 3510 | last_fixup_obj_off = parent_offset; |
def95c73 MC |
3511 | last_fixup_min_off = |
3512 | fda->parent_offset + sizeof(u32) * fda->num_fds; | |
3513 | } break; | |
7980240b MC |
3514 | case BINDER_TYPE_PTR: { |
3515 | struct binder_buffer_object *bp = | |
3516 | to_binder_buffer_object(hdr); | |
bde4a19f TK |
3517 | size_t buf_left = sg_buf_end_offset - sg_buf_offset; |
3518 | size_t num_valid; | |
7980240b MC |
3519 | |
3520 | if (bp->length > buf_left) { | |
3521 | binder_user_error("%d:%d got transaction with too large buffer\n", | |
3522 | proc->pid, thread->pid); | |
3523 | return_error = BR_FAILED_REPLY; | |
57ada2fb TK |
3524 | return_error_param = -EINVAL; |
3525 | return_error_line = __LINE__; | |
7980240b MC |
3526 | goto err_bad_offset; |
3527 | } | |
09184ae9 TK |
3528 | ret = binder_defer_copy(&sgc_head, sg_buf_offset, |
3529 | (const void __user *)(uintptr_t)bp->buffer, | |
3530 | bp->length); | |
3531 | if (ret) { | |
a15dac8b CL |
3532 | binder_txn_error("%d:%d deferred copy failed\n", |
3533 | thread->pid, proc->pid); | |
7980240b | 3534 | return_error = BR_FAILED_REPLY; |
09184ae9 | 3535 | return_error_param = ret; |
57ada2fb | 3536 | return_error_line = __LINE__; |
09184ae9 | 3537 | goto err_translate_failed; |
7980240b MC |
3538 | } |
3539 | /* Fixup buffer pointer to target proc address space */ | |
df9aabea | 3540 | bp->buffer = t->buffer->user_data + sg_buf_offset; |
bde4a19f | 3541 | sg_buf_offset += ALIGN(bp->length, sizeof(u64)); |
7980240b | 3542 | |
16981742 | 3543 | num_valid = (buffer_offset - off_start_offset) / |
bde4a19f | 3544 | sizeof(binder_size_t); |
09184ae9 TK |
3545 | ret = binder_fixup_parent(&pf_head, t, |
3546 | thread, bp, | |
db6b0b81 | 3547 | off_start_offset, |
bde4a19f | 3548 | num_valid, |
db6b0b81 | 3549 | last_fixup_obj_off, |
7980240b | 3550 | last_fixup_min_off); |
bb4a2e48 TK |
3551 | if (ret < 0 || |
3552 | binder_alloc_copy_to_buffer(&target_proc->alloc, | |
3553 | t->buffer, | |
3554 | object_offset, | |
3555 | bp, sizeof(*bp))) { | |
a15dac8b CL |
3556 | binder_txn_error("%d:%d failed to fixup parent\n", |
3557 | thread->pid, proc->pid); | |
7980240b | 3558 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3559 | return_error_param = ret; |
3560 | return_error_line = __LINE__; | |
7980240b MC |
3561 | goto err_translate_failed; |
3562 | } | |
db6b0b81 | 3563 | last_fixup_obj_off = object_offset; |
7980240b MC |
3564 | last_fixup_min_off = 0; |
3565 | } break; | |
355b0502 | 3566 | default: |
64dcfe6b | 3567 | binder_user_error("%d:%d got transaction with invalid object type, %x\n", |
feba3900 | 3568 | proc->pid, thread->pid, hdr->type); |
355b0502 | 3569 | return_error = BR_FAILED_REPLY; |
57ada2fb TK |
3570 | return_error_param = -EINVAL; |
3571 | return_error_line = __LINE__; | |
355b0502 GKH |
3572 | goto err_bad_object_type; |
3573 | } | |
3574 | } | |
6d98eb95 TK |
3575 | /* Done processing objects, copy the rest of the buffer */ |
3576 | if (binder_alloc_copy_user_to_buffer( | |
3577 | &target_proc->alloc, | |
3578 | t->buffer, user_offset, | |
3579 | user_buffer + user_offset, | |
3580 | tr->data_size - user_offset)) { | |
3581 | binder_user_error("%d:%d got transaction with invalid data ptr\n", | |
3582 | proc->pid, thread->pid); | |
3583 | return_error = BR_FAILED_REPLY; | |
3584 | return_error_param = -EFAULT; | |
3585 | return_error_line = __LINE__; | |
3586 | goto err_copy_data_failed; | |
3587 | } | |
09184ae9 TK |
3588 | |
3589 | ret = binder_do_deferred_txn_copies(&target_proc->alloc, t->buffer, | |
3590 | &sgc_head, &pf_head); | |
3591 | if (ret) { | |
3592 | binder_user_error("%d:%d got transaction with invalid offsets ptr\n", | |
3593 | proc->pid, thread->pid); | |
3594 | return_error = BR_FAILED_REPLY; | |
3595 | return_error_param = ret; | |
3596 | return_error_line = __LINE__; | |
3597 | goto err_copy_data_failed; | |
3598 | } | |
a7dc1e6f HL |
3599 | if (t->buffer->oneway_spam_suspect) |
3600 | tcomplete->type = BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT; | |
3601 | else | |
3602 | tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE; | |
673068ee | 3603 | t->work.type = BINDER_WORK_TRANSACTION; |
ccae6f67 | 3604 | |
355b0502 | 3605 | if (reply) { |
148ade2c | 3606 | binder_enqueue_thread_work(thread, tcomplete); |
0b89d69a | 3607 | binder_inner_proc_lock(target_proc); |
b564171a LL |
3608 | if (target_thread->is_dead) { |
3609 | return_error = BR_DEAD_REPLY; | |
0b89d69a | 3610 | binder_inner_proc_unlock(target_proc); |
7a4408c6 | 3611 | goto err_dead_proc_or_thread; |
0b89d69a | 3612 | } |
355b0502 | 3613 | BUG_ON(t->buffer->async_transaction != 0); |
0b89d69a | 3614 | binder_pop_transaction_ilocked(target_thread, in_reply_to); |
148ade2c | 3615 | binder_enqueue_thread_work_ilocked(target_thread, &t->work); |
432ff1e9 | 3616 | target_proc->outstanding_txns++; |
0b89d69a | 3617 | binder_inner_proc_unlock(target_proc); |
408c68b1 | 3618 | wake_up_interruptible_sync(&target_thread->wait); |
b6d282ce | 3619 | binder_free_transaction(in_reply_to); |
355b0502 GKH |
3620 | } else if (!(t->flags & TF_ONE_WAY)) { |
3621 | BUG_ON(t->buffer->async_transaction != 0); | |
0b89d69a | 3622 | binder_inner_proc_lock(proc); |
148ade2c MC |
3623 | /* |
3624 | * Defer the TRANSACTION_COMPLETE, so we don't return to | |
3625 | * userspace immediately; this allows the target process to | |
3626 | * immediately start processing this transaction, reducing | |
3627 | * latency. We will then return the TRANSACTION_COMPLETE when | |
3628 | * the target replies (or there is an error). | |
3629 | */ | |
3630 | binder_enqueue_deferred_thread_work_ilocked(thread, tcomplete); | |
355b0502 GKH |
3631 | t->need_reply = 1; |
3632 | t->from_parent = thread->transaction_stack; | |
3633 | thread->transaction_stack = t; | |
0b89d69a | 3634 | binder_inner_proc_unlock(proc); |
432ff1e9 MB |
3635 | return_error = binder_proc_transaction(t, |
3636 | target_proc, target_thread); | |
3637 | if (return_error) { | |
0b89d69a MC |
3638 | binder_inner_proc_lock(proc); |
3639 | binder_pop_transaction_ilocked(thread, t); | |
3640 | binder_inner_proc_unlock(proc); | |
7a4408c6 TK |
3641 | goto err_dead_proc_or_thread; |
3642 | } | |
355b0502 GKH |
3643 | } else { |
3644 | BUG_ON(target_node == NULL); | |
3645 | BUG_ON(t->buffer->async_transaction != 1); | |
432ff1e9 | 3646 | return_error = binder_proc_transaction(t, target_proc, NULL); |
0567461a LL |
3647 | /* |
3648 | * Let the caller know when async transaction reaches a frozen | |
3649 | * process and is put in a pending queue, waiting for the target | |
3650 | * process to be unfrozen. | |
3651 | */ | |
3652 | if (return_error == BR_TRANSACTION_PENDING_FROZEN) | |
3653 | tcomplete->type = BINDER_WORK_TRANSACTION_PENDING; | |
3654 | binder_enqueue_thread_work(thread, tcomplete); | |
3655 | if (return_error && | |
3656 | return_error != BR_TRANSACTION_PENDING_FROZEN) | |
7a4408c6 | 3657 | goto err_dead_proc_or_thread; |
00b40d61 | 3658 | } |
7a4408c6 TK |
3659 | if (target_thread) |
3660 | binder_thread_dec_tmpref(target_thread); | |
3661 | binder_proc_dec_tmpref(target_proc); | |
512cf465 TK |
3662 | if (target_node) |
3663 | binder_dec_node_tmpref(target_node); | |
d99c7333 TK |
3664 | /* |
3665 | * write barrier to synchronize with initialization | |
3666 | * of log entry | |
3667 | */ | |
3668 | smp_wmb(); | |
3669 | WRITE_ONCE(e->debug_id_done, t_debug_id); | |
355b0502 GKH |
3670 | return; |
3671 | ||
7a4408c6 | 3672 | err_dead_proc_or_thread: |
a15dac8b CL |
3673 | binder_txn_error("%d:%d dead process or thread\n", |
3674 | thread->pid, proc->pid); | |
7a4408c6 | 3675 | return_error_line = __LINE__; |
d53bebdf | 3676 | binder_dequeue_work(proc, tcomplete); |
a056af42 | 3677 | err_translate_failed: |
355b0502 GKH |
3678 | err_bad_object_type: |
3679 | err_bad_offset: | |
def95c73 | 3680 | err_bad_parent: |
355b0502 | 3681 | err_copy_data_failed: |
09184ae9 | 3682 | binder_cleanup_deferred_txn_lists(&sgc_head, &pf_head); |
44d8047f | 3683 | binder_free_txn_fixups(t); |
975a1ac9 | 3684 | trace_binder_transaction_failed_buffer_release(t->buffer); |
5fdb55c1 | 3685 | binder_transaction_buffer_release(target_proc, NULL, t->buffer, |
bde4a19f | 3686 | buffer_offset, true); |
512cf465 TK |
3687 | if (target_node) |
3688 | binder_dec_node_tmpref(target_node); | |
eb34983b | 3689 | target_node = NULL; |
355b0502 | 3690 | t->buffer->transaction = NULL; |
19c98724 | 3691 | binder_alloc_free_buf(&target_proc->alloc, t->buffer); |
355b0502 | 3692 | err_binder_alloc_buf_failed: |
0b050950 | 3693 | err_bad_extra_size: |
ec74136d TK |
3694 | if (secctx) |
3695 | security_release_secctx(secctx, secctx_sz); | |
3696 | err_get_secctx_failed: | |
355b0502 GKH |
3697 | kfree(tcomplete); |
3698 | binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); | |
3699 | err_alloc_tcomplete_failed: | |
1987f112 FC |
3700 | if (trace_binder_txn_latency_free_enabled()) |
3701 | binder_txn_latency_free(t); | |
355b0502 GKH |
3702 | kfree(t); |
3703 | binder_stats_deleted(BINDER_STAT_TRANSACTION); | |
3704 | err_alloc_t_failed: | |
44b73962 | 3705 | err_bad_todo_list: |
355b0502 GKH |
3706 | err_bad_call_stack: |
3707 | err_empty_call_stack: | |
3708 | err_dead_binder: | |
3709 | err_invalid_target_handle: | |
512cf465 | 3710 | if (target_node) { |
eb34983b | 3711 | binder_dec_node(target_node, 1, 0); |
512cf465 TK |
3712 | binder_dec_node_tmpref(target_node); |
3713 | } | |
eb34983b | 3714 | |
355b0502 | 3715 | binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, |
9474be34 CL |
3716 | "%d:%d transaction %s to %d:%d failed %d/%d/%d, size %lld-%lld line %d\n", |
3717 | proc->pid, thread->pid, reply ? "reply" : | |
3718 | (tr->flags & TF_ONE_WAY ? "async" : "call"), | |
3719 | target_proc ? target_proc->pid : 0, | |
3720 | target_thread ? target_thread->pid : 0, | |
3721 | t_debug_id, return_error, return_error_param, | |
57ada2fb TK |
3722 | (u64)tr->data_size, (u64)tr->offsets_size, |
3723 | return_error_line); | |
355b0502 | 3724 | |
dafa5e9a CL |
3725 | if (target_thread) |
3726 | binder_thread_dec_tmpref(target_thread); | |
3727 | if (target_proc) | |
3728 | binder_proc_dec_tmpref(target_proc); | |
3729 | ||
355b0502 GKH |
3730 | { |
3731 | struct binder_transaction_log_entry *fe; | |
10f62861 | 3732 | |
57ada2fb TK |
3733 | e->return_error = return_error; |
3734 | e->return_error_param = return_error_param; | |
3735 | e->return_error_line = return_error_line; | |
355b0502 GKH |
3736 | fe = binder_transaction_log_add(&binder_transaction_log_failed); |
3737 | *fe = *e; | |
d99c7333 TK |
3738 | /* |
3739 | * write barrier to synchronize with initialization | |
3740 | * of log entry | |
3741 | */ | |
3742 | smp_wmb(); | |
3743 | WRITE_ONCE(e->debug_id_done, t_debug_id); | |
3744 | WRITE_ONCE(fe->debug_id_done, t_debug_id); | |
355b0502 GKH |
3745 | } |
3746 | ||
26549d17 | 3747 | BUG_ON(thread->return_error.cmd != BR_OK); |
355b0502 | 3748 | if (in_reply_to) { |
bd32889e CL |
3749 | binder_set_txn_from_error(in_reply_to, t_debug_id, |
3750 | return_error, return_error_param); | |
26549d17 | 3751 | thread->return_error.cmd = BR_TRANSACTION_COMPLETE; |
148ade2c | 3752 | binder_enqueue_thread_work(thread, &thread->return_error.work); |
355b0502 | 3753 | binder_send_failed_reply(in_reply_to, return_error); |
26549d17 | 3754 | } else { |
bd32889e CL |
3755 | binder_inner_proc_lock(proc); |
3756 | binder_set_extended_error(&thread->ee, t_debug_id, | |
3757 | return_error, return_error_param); | |
3758 | binder_inner_proc_unlock(proc); | |
26549d17 | 3759 | thread->return_error.cmd = return_error; |
148ade2c | 3760 | binder_enqueue_thread_work(thread, &thread->return_error.work); |
26549d17 | 3761 | } |
355b0502 GKH |
3762 | } |
3763 | ||
44d8047f TK |
3764 | /** |
3765 | * binder_free_buf() - free the specified buffer | |
3766 | * @proc: binder proc that owns buffer | |
3767 | * @buffer: buffer to be freed | |
32e9f56a | 3768 | * @is_failure: failed to send transaction |
44d8047f TK |
3769 | * |
3770 | * If buffer for an async transaction, enqueue the next async | |
3771 | * transaction from the node. | |
3772 | * | |
3773 | * Cleanup buffer and free it. | |
3774 | */ | |
f4608ce9 | 3775 | static void |
5fdb55c1 TK |
3776 | binder_free_buf(struct binder_proc *proc, |
3777 | struct binder_thread *thread, | |
32e9f56a | 3778 | struct binder_buffer *buffer, bool is_failure) |
44d8047f | 3779 | { |
a370003c | 3780 | binder_inner_proc_lock(proc); |
44d8047f TK |
3781 | if (buffer->transaction) { |
3782 | buffer->transaction->buffer = NULL; | |
3783 | buffer->transaction = NULL; | |
3784 | } | |
a370003c | 3785 | binder_inner_proc_unlock(proc); |
44d8047f TK |
3786 | if (buffer->async_transaction && buffer->target_node) { |
3787 | struct binder_node *buf_node; | |
3788 | struct binder_work *w; | |
3789 | ||
3790 | buf_node = buffer->target_node; | |
3791 | binder_node_inner_lock(buf_node); | |
3792 | BUG_ON(!buf_node->has_async_transaction); | |
3793 | BUG_ON(buf_node->proc != proc); | |
3794 | w = binder_dequeue_work_head_ilocked( | |
3795 | &buf_node->async_todo); | |
3796 | if (!w) { | |
3797 | buf_node->has_async_transaction = false; | |
3798 | } else { | |
3799 | binder_enqueue_work_ilocked( | |
3800 | w, &proc->todo); | |
3801 | binder_wakeup_proc_ilocked(proc); | |
3802 | } | |
3803 | binder_node_inner_unlock(buf_node); | |
3804 | } | |
3805 | trace_binder_transaction_buffer_release(buffer); | |
bdc1c5fa | 3806 | binder_release_entire_buffer(proc, thread, buffer, is_failure); |
44d8047f TK |
3807 | binder_alloc_free_buf(&proc->alloc, buffer); |
3808 | } | |
3809 | ||
fb07ebc3 BP |
3810 | static int binder_thread_write(struct binder_proc *proc, |
3811 | struct binder_thread *thread, | |
da49889d AH |
3812 | binder_uintptr_t binder_buffer, size_t size, |
3813 | binder_size_t *consumed) | |
355b0502 GKH |
3814 | { |
3815 | uint32_t cmd; | |
342e5c90 | 3816 | struct binder_context *context = proc->context; |
da49889d | 3817 | void __user *buffer = (void __user *)(uintptr_t)binder_buffer; |
355b0502 GKH |
3818 | void __user *ptr = buffer + *consumed; |
3819 | void __user *end = buffer + size; | |
3820 | ||
26549d17 | 3821 | while (ptr < end && thread->return_error.cmd == BR_OK) { |
372e3147 TK |
3822 | int ret; |
3823 | ||
355b0502 GKH |
3824 | if (get_user(cmd, (uint32_t __user *)ptr)) |
3825 | return -EFAULT; | |
3826 | ptr += sizeof(uint32_t); | |
975a1ac9 | 3827 | trace_binder_command(cmd); |
355b0502 | 3828 | if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) { |
0953c797 BJS |
3829 | atomic_inc(&binder_stats.bc[_IOC_NR(cmd)]); |
3830 | atomic_inc(&proc->stats.bc[_IOC_NR(cmd)]); | |
3831 | atomic_inc(&thread->stats.bc[_IOC_NR(cmd)]); | |
355b0502 GKH |
3832 | } |
3833 | switch (cmd) { | |
3834 | case BC_INCREFS: | |
3835 | case BC_ACQUIRE: | |
3836 | case BC_RELEASE: | |
3837 | case BC_DECREFS: { | |
3838 | uint32_t target; | |
355b0502 | 3839 | const char *debug_string; |
372e3147 TK |
3840 | bool strong = cmd == BC_ACQUIRE || cmd == BC_RELEASE; |
3841 | bool increment = cmd == BC_INCREFS || cmd == BC_ACQUIRE; | |
3842 | struct binder_ref_data rdata; | |
355b0502 GKH |
3843 | |
3844 | if (get_user(target, (uint32_t __user *)ptr)) | |
3845 | return -EFAULT; | |
c44b1231 | 3846 | |
355b0502 | 3847 | ptr += sizeof(uint32_t); |
372e3147 TK |
3848 | ret = -1; |
3849 | if (increment && !target) { | |
c44b1231 | 3850 | struct binder_node *ctx_mgr_node; |
6c20032c | 3851 | |
c44b1231 TK |
3852 | mutex_lock(&context->context_mgr_node_lock); |
3853 | ctx_mgr_node = context->binder_context_mgr_node; | |
4b836a14 JH |
3854 | if (ctx_mgr_node) { |
3855 | if (ctx_mgr_node->proc == proc) { | |
3856 | binder_user_error("%d:%d context manager tried to acquire desc 0\n", | |
3857 | proc->pid, thread->pid); | |
3858 | mutex_unlock(&context->context_mgr_node_lock); | |
3859 | return -EINVAL; | |
3860 | } | |
372e3147 TK |
3861 | ret = binder_inc_ref_for_node( |
3862 | proc, ctx_mgr_node, | |
3863 | strong, NULL, &rdata); | |
4b836a14 | 3864 | } |
c44b1231 TK |
3865 | mutex_unlock(&context->context_mgr_node_lock); |
3866 | } | |
372e3147 TK |
3867 | if (ret) |
3868 | ret = binder_update_ref_for_handle( | |
3869 | proc, target, increment, strong, | |
3870 | &rdata); | |
3871 | if (!ret && rdata.desc != target) { | |
3872 | binder_user_error("%d:%d tried to acquire reference to desc %d, got %d instead\n", | |
3873 | proc->pid, thread->pid, | |
3874 | target, rdata.desc); | |
355b0502 GKH |
3875 | } |
3876 | switch (cmd) { | |
3877 | case BC_INCREFS: | |
3878 | debug_string = "IncRefs"; | |
355b0502 GKH |
3879 | break; |
3880 | case BC_ACQUIRE: | |
3881 | debug_string = "Acquire"; | |
355b0502 GKH |
3882 | break; |
3883 | case BC_RELEASE: | |
3884 | debug_string = "Release"; | |
355b0502 GKH |
3885 | break; |
3886 | case BC_DECREFS: | |
3887 | default: | |
3888 | debug_string = "DecRefs"; | |
372e3147 TK |
3889 | break; |
3890 | } | |
3891 | if (ret) { | |
3892 | binder_user_error("%d:%d %s %d refcount change on invalid ref %d ret %d\n", | |
3893 | proc->pid, thread->pid, debug_string, | |
3894 | strong, target, ret); | |
355b0502 GKH |
3895 | break; |
3896 | } | |
3897 | binder_debug(BINDER_DEBUG_USER_REFS, | |
372e3147 TK |
3898 | "%d:%d %s ref %d desc %d s %d w %d\n", |
3899 | proc->pid, thread->pid, debug_string, | |
3900 | rdata.debug_id, rdata.desc, rdata.strong, | |
3901 | rdata.weak); | |
355b0502 GKH |
3902 | break; |
3903 | } | |
3904 | case BC_INCREFS_DONE: | |
3905 | case BC_ACQUIRE_DONE: { | |
da49889d AH |
3906 | binder_uintptr_t node_ptr; |
3907 | binder_uintptr_t cookie; | |
355b0502 | 3908 | struct binder_node *node; |
673068ee | 3909 | bool free_node; |
355b0502 | 3910 | |
da49889d | 3911 | if (get_user(node_ptr, (binder_uintptr_t __user *)ptr)) |
355b0502 | 3912 | return -EFAULT; |
da49889d AH |
3913 | ptr += sizeof(binder_uintptr_t); |
3914 | if (get_user(cookie, (binder_uintptr_t __user *)ptr)) | |
355b0502 | 3915 | return -EFAULT; |
da49889d | 3916 | ptr += sizeof(binder_uintptr_t); |
355b0502 GKH |
3917 | node = binder_get_node(proc, node_ptr); |
3918 | if (node == NULL) { | |
da49889d | 3919 | binder_user_error("%d:%d %s u%016llx no match\n", |
355b0502 GKH |
3920 | proc->pid, thread->pid, |
3921 | cmd == BC_INCREFS_DONE ? | |
3922 | "BC_INCREFS_DONE" : | |
3923 | "BC_ACQUIRE_DONE", | |
da49889d | 3924 | (u64)node_ptr); |
355b0502 GKH |
3925 | break; |
3926 | } | |
3927 | if (cookie != node->cookie) { | |
da49889d | 3928 | binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n", |
355b0502 GKH |
3929 | proc->pid, thread->pid, |
3930 | cmd == BC_INCREFS_DONE ? | |
3931 | "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE", | |
da49889d AH |
3932 | (u64)node_ptr, node->debug_id, |
3933 | (u64)cookie, (u64)node->cookie); | |
adc18842 | 3934 | binder_put_node(node); |
355b0502 GKH |
3935 | break; |
3936 | } | |
673068ee | 3937 | binder_node_inner_lock(node); |
355b0502 GKH |
3938 | if (cmd == BC_ACQUIRE_DONE) { |
3939 | if (node->pending_strong_ref == 0) { | |
56b468fc | 3940 | binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n", |
355b0502 GKH |
3941 | proc->pid, thread->pid, |
3942 | node->debug_id); | |
673068ee | 3943 | binder_node_inner_unlock(node); |
adc18842 | 3944 | binder_put_node(node); |
355b0502 GKH |
3945 | break; |
3946 | } | |
3947 | node->pending_strong_ref = 0; | |
3948 | } else { | |
3949 | if (node->pending_weak_ref == 0) { | |
56b468fc | 3950 | binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n", |
355b0502 GKH |
3951 | proc->pid, thread->pid, |
3952 | node->debug_id); | |
673068ee | 3953 | binder_node_inner_unlock(node); |
adc18842 | 3954 | binder_put_node(node); |
355b0502 GKH |
3955 | break; |
3956 | } | |
3957 | node->pending_weak_ref = 0; | |
3958 | } | |
673068ee TK |
3959 | free_node = binder_dec_node_nilocked(node, |
3960 | cmd == BC_ACQUIRE_DONE, 0); | |
3961 | WARN_ON(free_node); | |
355b0502 | 3962 | binder_debug(BINDER_DEBUG_USER_REFS, |
adc18842 | 3963 | "%d:%d %s node %d ls %d lw %d tr %d\n", |
355b0502 GKH |
3964 | proc->pid, thread->pid, |
3965 | cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE", | |
adc18842 TK |
3966 | node->debug_id, node->local_strong_refs, |
3967 | node->local_weak_refs, node->tmp_refs); | |
673068ee | 3968 | binder_node_inner_unlock(node); |
adc18842 | 3969 | binder_put_node(node); |
355b0502 GKH |
3970 | break; |
3971 | } | |
3972 | case BC_ATTEMPT_ACQUIRE: | |
56b468fc | 3973 | pr_err("BC_ATTEMPT_ACQUIRE not supported\n"); |
355b0502 GKH |
3974 | return -EINVAL; |
3975 | case BC_ACQUIRE_RESULT: | |
56b468fc | 3976 | pr_err("BC_ACQUIRE_RESULT not supported\n"); |
355b0502 GKH |
3977 | return -EINVAL; |
3978 | ||
3979 | case BC_FREE_BUFFER: { | |
da49889d | 3980 | binder_uintptr_t data_ptr; |
355b0502 GKH |
3981 | struct binder_buffer *buffer; |
3982 | ||
da49889d | 3983 | if (get_user(data_ptr, (binder_uintptr_t __user *)ptr)) |
355b0502 | 3984 | return -EFAULT; |
da49889d | 3985 | ptr += sizeof(binder_uintptr_t); |
355b0502 | 3986 | |
53d311cf TK |
3987 | buffer = binder_alloc_prepare_to_free(&proc->alloc, |
3988 | data_ptr); | |
7bada55a TK |
3989 | if (IS_ERR_OR_NULL(buffer)) { |
3990 | if (PTR_ERR(buffer) == -EPERM) { | |
3991 | binder_user_error( | |
3992 | "%d:%d BC_FREE_BUFFER u%016llx matched unreturned or currently freeing buffer\n", | |
3993 | proc->pid, thread->pid, | |
3994 | (u64)data_ptr); | |
3995 | } else { | |
3996 | binder_user_error( | |
3997 | "%d:%d BC_FREE_BUFFER u%016llx no match\n", | |
3998 | proc->pid, thread->pid, | |
3999 | (u64)data_ptr); | |
4000 | } | |
355b0502 GKH |
4001 | break; |
4002 | } | |
4003 | binder_debug(BINDER_DEBUG_FREE_BUFFER, | |
da49889d AH |
4004 | "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n", |
4005 | proc->pid, thread->pid, (u64)data_ptr, | |
4006 | buffer->debug_id, | |
355b0502 | 4007 | buffer->transaction ? "active" : "finished"); |
32e9f56a | 4008 | binder_free_buf(proc, thread, buffer, false); |
355b0502 GKH |
4009 | break; |
4010 | } | |
4011 | ||
7980240b MC |
4012 | case BC_TRANSACTION_SG: |
4013 | case BC_REPLY_SG: { | |
4014 | struct binder_transaction_data_sg tr; | |
4015 | ||
4016 | if (copy_from_user(&tr, ptr, sizeof(tr))) | |
4017 | return -EFAULT; | |
4018 | ptr += sizeof(tr); | |
4019 | binder_transaction(proc, thread, &tr.transaction_data, | |
4020 | cmd == BC_REPLY_SG, tr.buffers_size); | |
4021 | break; | |
4022 | } | |
355b0502 GKH |
4023 | case BC_TRANSACTION: |
4024 | case BC_REPLY: { | |
4025 | struct binder_transaction_data tr; | |
4026 | ||
4027 | if (copy_from_user(&tr, ptr, sizeof(tr))) | |
4028 | return -EFAULT; | |
4029 | ptr += sizeof(tr); | |
4bfac80a MC |
4030 | binder_transaction(proc, thread, &tr, |
4031 | cmd == BC_REPLY, 0); | |
355b0502 GKH |
4032 | break; |
4033 | } | |
4034 | ||
4035 | case BC_REGISTER_LOOPER: | |
4036 | binder_debug(BINDER_DEBUG_THREADS, | |
56b468fc | 4037 | "%d:%d BC_REGISTER_LOOPER\n", |
355b0502 | 4038 | proc->pid, thread->pid); |
b3e68612 | 4039 | binder_inner_proc_lock(proc); |
355b0502 GKH |
4040 | if (thread->looper & BINDER_LOOPER_STATE_ENTERED) { |
4041 | thread->looper |= BINDER_LOOPER_STATE_INVALID; | |
56b468fc | 4042 | binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n", |
355b0502 GKH |
4043 | proc->pid, thread->pid); |
4044 | } else if (proc->requested_threads == 0) { | |
4045 | thread->looper |= BINDER_LOOPER_STATE_INVALID; | |
56b468fc | 4046 | binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n", |
355b0502 GKH |
4047 | proc->pid, thread->pid); |
4048 | } else { | |
4049 | proc->requested_threads--; | |
4050 | proc->requested_threads_started++; | |
4051 | } | |
4052 | thread->looper |= BINDER_LOOPER_STATE_REGISTERED; | |
b3e68612 | 4053 | binder_inner_proc_unlock(proc); |
355b0502 GKH |
4054 | break; |
4055 | case BC_ENTER_LOOPER: | |
4056 | binder_debug(BINDER_DEBUG_THREADS, | |
56b468fc | 4057 | "%d:%d BC_ENTER_LOOPER\n", |
355b0502 GKH |
4058 | proc->pid, thread->pid); |
4059 | if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) { | |
4060 | thread->looper |= BINDER_LOOPER_STATE_INVALID; | |
56b468fc | 4061 | binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n", |
355b0502 GKH |
4062 | proc->pid, thread->pid); |
4063 | } | |
4064 | thread->looper |= BINDER_LOOPER_STATE_ENTERED; | |
4065 | break; | |
4066 | case BC_EXIT_LOOPER: | |
4067 | binder_debug(BINDER_DEBUG_THREADS, | |
56b468fc | 4068 | "%d:%d BC_EXIT_LOOPER\n", |
355b0502 GKH |
4069 | proc->pid, thread->pid); |
4070 | thread->looper |= BINDER_LOOPER_STATE_EXITED; | |
4071 | break; | |
4072 | ||
4073 | case BC_REQUEST_DEATH_NOTIFICATION: | |
4074 | case BC_CLEAR_DEATH_NOTIFICATION: { | |
4075 | uint32_t target; | |
da49889d | 4076 | binder_uintptr_t cookie; |
355b0502 | 4077 | struct binder_ref *ref; |
2c1838dc | 4078 | struct binder_ref_death *death = NULL; |
355b0502 GKH |
4079 | |
4080 | if (get_user(target, (uint32_t __user *)ptr)) | |
4081 | return -EFAULT; | |
4082 | ptr += sizeof(uint32_t); | |
da49889d | 4083 | if (get_user(cookie, (binder_uintptr_t __user *)ptr)) |
355b0502 | 4084 | return -EFAULT; |
da49889d | 4085 | ptr += sizeof(binder_uintptr_t); |
2c1838dc TK |
4086 | if (cmd == BC_REQUEST_DEATH_NOTIFICATION) { |
4087 | /* | |
4088 | * Allocate memory for death notification | |
4089 | * before taking lock | |
4090 | */ | |
4091 | death = kzalloc(sizeof(*death), GFP_KERNEL); | |
4092 | if (death == NULL) { | |
4093 | WARN_ON(thread->return_error.cmd != | |
4094 | BR_OK); | |
4095 | thread->return_error.cmd = BR_ERROR; | |
148ade2c MC |
4096 | binder_enqueue_thread_work( |
4097 | thread, | |
4098 | &thread->return_error.work); | |
2c1838dc TK |
4099 | binder_debug( |
4100 | BINDER_DEBUG_FAILED_TRANSACTION, | |
4101 | "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n", | |
4102 | proc->pid, thread->pid); | |
4103 | break; | |
4104 | } | |
4105 | } | |
4106 | binder_proc_lock(proc); | |
4107 | ref = binder_get_ref_olocked(proc, target, false); | |
355b0502 | 4108 | if (ref == NULL) { |
56b468fc | 4109 | binder_user_error("%d:%d %s invalid ref %d\n", |
355b0502 GKH |
4110 | proc->pid, thread->pid, |
4111 | cmd == BC_REQUEST_DEATH_NOTIFICATION ? | |
4112 | "BC_REQUEST_DEATH_NOTIFICATION" : | |
4113 | "BC_CLEAR_DEATH_NOTIFICATION", | |
4114 | target); | |
2c1838dc TK |
4115 | binder_proc_unlock(proc); |
4116 | kfree(death); | |
355b0502 GKH |
4117 | break; |
4118 | } | |
4119 | ||
4120 | binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION, | |
da49889d | 4121 | "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n", |
355b0502 GKH |
4122 | proc->pid, thread->pid, |
4123 | cmd == BC_REQUEST_DEATH_NOTIFICATION ? | |
4124 | "BC_REQUEST_DEATH_NOTIFICATION" : | |
4125 | "BC_CLEAR_DEATH_NOTIFICATION", | |
372e3147 TK |
4126 | (u64)cookie, ref->data.debug_id, |
4127 | ref->data.desc, ref->data.strong, | |
4128 | ref->data.weak, ref->node->debug_id); | |
355b0502 | 4129 | |
ab51ec6b | 4130 | binder_node_lock(ref->node); |
355b0502 GKH |
4131 | if (cmd == BC_REQUEST_DEATH_NOTIFICATION) { |
4132 | if (ref->death) { | |
56b468fc | 4133 | binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n", |
355b0502 | 4134 | proc->pid, thread->pid); |
ab51ec6b | 4135 | binder_node_unlock(ref->node); |
2c1838dc TK |
4136 | binder_proc_unlock(proc); |
4137 | kfree(death); | |
355b0502 GKH |
4138 | break; |
4139 | } | |
4140 | binder_stats_created(BINDER_STAT_DEATH); | |
4141 | INIT_LIST_HEAD(&death->work.entry); | |
4142 | death->cookie = cookie; | |
4143 | ref->death = death; | |
4144 | if (ref->node->proc == NULL) { | |
4145 | ref->death->work.type = BINDER_WORK_DEAD_BINDER; | |
bb74562a MC |
4146 | |
4147 | binder_inner_proc_lock(proc); | |
4148 | binder_enqueue_work_ilocked( | |
4149 | &ref->death->work, &proc->todo); | |
4150 | binder_wakeup_proc_ilocked(proc); | |
4151 | binder_inner_proc_unlock(proc); | |
355b0502 GKH |
4152 | } |
4153 | } else { | |
4154 | if (ref->death == NULL) { | |
56b468fc | 4155 | binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n", |
355b0502 | 4156 | proc->pid, thread->pid); |
673068ee | 4157 | binder_node_unlock(ref->node); |
2c1838dc | 4158 | binder_proc_unlock(proc); |
355b0502 GKH |
4159 | break; |
4160 | } | |
4161 | death = ref->death; | |
4162 | if (death->cookie != cookie) { | |
da49889d | 4163 | binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n", |
355b0502 | 4164 | proc->pid, thread->pid, |
da49889d AH |
4165 | (u64)death->cookie, |
4166 | (u64)cookie); | |
673068ee | 4167 | binder_node_unlock(ref->node); |
2c1838dc | 4168 | binder_proc_unlock(proc); |
355b0502 GKH |
4169 | break; |
4170 | } | |
4171 | ref->death = NULL; | |
72196393 | 4172 | binder_inner_proc_lock(proc); |
355b0502 GKH |
4173 | if (list_empty(&death->work.entry)) { |
4174 | death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION; | |
72196393 TK |
4175 | if (thread->looper & |
4176 | (BINDER_LOOPER_STATE_REGISTERED | | |
4177 | BINDER_LOOPER_STATE_ENTERED)) | |
148ade2c MC |
4178 | binder_enqueue_thread_work_ilocked( |
4179 | thread, | |
4180 | &death->work); | |
72196393 TK |
4181 | else { |
4182 | binder_enqueue_work_ilocked( | |
4183 | &death->work, | |
4184 | &proc->todo); | |
1b77e9dc | 4185 | binder_wakeup_proc_ilocked( |
408c68b1 | 4186 | proc); |
355b0502 GKH |
4187 | } |
4188 | } else { | |
4189 | BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER); | |
4190 | death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR; | |
4191 | } | |
72196393 | 4192 | binder_inner_proc_unlock(proc); |
355b0502 | 4193 | } |
ab51ec6b | 4194 | binder_node_unlock(ref->node); |
2c1838dc | 4195 | binder_proc_unlock(proc); |
355b0502 GKH |
4196 | } break; |
4197 | case BC_DEAD_BINDER_DONE: { | |
4198 | struct binder_work *w; | |
da49889d | 4199 | binder_uintptr_t cookie; |
355b0502 | 4200 | struct binder_ref_death *death = NULL; |
10f62861 | 4201 | |
da49889d | 4202 | if (get_user(cookie, (binder_uintptr_t __user *)ptr)) |
355b0502 GKH |
4203 | return -EFAULT; |
4204 | ||
7a64cd88 | 4205 | ptr += sizeof(cookie); |
72196393 TK |
4206 | binder_inner_proc_lock(proc); |
4207 | list_for_each_entry(w, &proc->delivered_death, | |
4208 | entry) { | |
4209 | struct binder_ref_death *tmp_death = | |
4210 | container_of(w, | |
4211 | struct binder_ref_death, | |
4212 | work); | |
10f62861 | 4213 | |
355b0502 GKH |
4214 | if (tmp_death->cookie == cookie) { |
4215 | death = tmp_death; | |
4216 | break; | |
4217 | } | |
4218 | } | |
4219 | binder_debug(BINDER_DEBUG_DEAD_BINDER, | |
8ca86f16 | 4220 | "%d:%d BC_DEAD_BINDER_DONE %016llx found %pK\n", |
da49889d AH |
4221 | proc->pid, thread->pid, (u64)cookie, |
4222 | death); | |
355b0502 | 4223 | if (death == NULL) { |
da49889d AH |
4224 | binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n", |
4225 | proc->pid, thread->pid, (u64)cookie); | |
72196393 | 4226 | binder_inner_proc_unlock(proc); |
355b0502 GKH |
4227 | break; |
4228 | } | |
72196393 | 4229 | binder_dequeue_work_ilocked(&death->work); |
355b0502 GKH |
4230 | if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) { |
4231 | death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION; | |
72196393 TK |
4232 | if (thread->looper & |
4233 | (BINDER_LOOPER_STATE_REGISTERED | | |
4234 | BINDER_LOOPER_STATE_ENTERED)) | |
148ade2c MC |
4235 | binder_enqueue_thread_work_ilocked( |
4236 | thread, &death->work); | |
72196393 TK |
4237 | else { |
4238 | binder_enqueue_work_ilocked( | |
4239 | &death->work, | |
4240 | &proc->todo); | |
408c68b1 | 4241 | binder_wakeup_proc_ilocked(proc); |
355b0502 GKH |
4242 | } |
4243 | } | |
72196393 | 4244 | binder_inner_proc_unlock(proc); |
355b0502 GKH |
4245 | } break; |
4246 | ||
4247 | default: | |
da486496 | 4248 | pr_err("%d:%d unknown command %u\n", |
355b0502 GKH |
4249 | proc->pid, thread->pid, cmd); |
4250 | return -EINVAL; | |
4251 | } | |
4252 | *consumed = ptr - buffer; | |
4253 | } | |
4254 | return 0; | |
4255 | } | |
4256 | ||
fb07ebc3 BP |
4257 | static void binder_stat_br(struct binder_proc *proc, |
4258 | struct binder_thread *thread, uint32_t cmd) | |
355b0502 | 4259 | { |
975a1ac9 | 4260 | trace_binder_return(cmd); |
355b0502 | 4261 | if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) { |
0953c797 BJS |
4262 | atomic_inc(&binder_stats.br[_IOC_NR(cmd)]); |
4263 | atomic_inc(&proc->stats.br[_IOC_NR(cmd)]); | |
4264 | atomic_inc(&thread->stats.br[_IOC_NR(cmd)]); | |
355b0502 GKH |
4265 | } |
4266 | } | |
4267 | ||
26b47d8a TK |
4268 | static int binder_put_node_cmd(struct binder_proc *proc, |
4269 | struct binder_thread *thread, | |
4270 | void __user **ptrp, | |
4271 | binder_uintptr_t node_ptr, | |
4272 | binder_uintptr_t node_cookie, | |
4273 | int node_debug_id, | |
4274 | uint32_t cmd, const char *cmd_name) | |
4275 | { | |
4276 | void __user *ptr = *ptrp; | |
4277 | ||
4278 | if (put_user(cmd, (uint32_t __user *)ptr)) | |
4279 | return -EFAULT; | |
4280 | ptr += sizeof(uint32_t); | |
4281 | ||
4282 | if (put_user(node_ptr, (binder_uintptr_t __user *)ptr)) | |
4283 | return -EFAULT; | |
4284 | ptr += sizeof(binder_uintptr_t); | |
4285 | ||
4286 | if (put_user(node_cookie, (binder_uintptr_t __user *)ptr)) | |
4287 | return -EFAULT; | |
4288 | ptr += sizeof(binder_uintptr_t); | |
4289 | ||
4290 | binder_stat_br(proc, thread, cmd); | |
4291 | binder_debug(BINDER_DEBUG_USER_REFS, "%d:%d %s %d u%016llx c%016llx\n", | |
4292 | proc->pid, thread->pid, cmd_name, node_debug_id, | |
4293 | (u64)node_ptr, (u64)node_cookie); | |
4294 | ||
4295 | *ptrp = ptr; | |
4296 | return 0; | |
4297 | } | |
4298 | ||
1b77e9dc MC |
4299 | static int binder_wait_for_work(struct binder_thread *thread, |
4300 | bool do_proc_work) | |
4301 | { | |
4302 | DEFINE_WAIT(wait); | |
4303 | struct binder_proc *proc = thread->proc; | |
4304 | int ret = 0; | |
4305 | ||
1b77e9dc MC |
4306 | binder_inner_proc_lock(proc); |
4307 | for (;;) { | |
f5d39b02 | 4308 | prepare_to_wait(&thread->wait, &wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE); |
1b77e9dc MC |
4309 | if (binder_has_work_ilocked(thread, do_proc_work)) |
4310 | break; | |
4311 | if (do_proc_work) | |
4312 | list_add(&thread->waiting_thread_node, | |
4313 | &proc->waiting_threads); | |
4314 | binder_inner_proc_unlock(proc); | |
4315 | schedule(); | |
4316 | binder_inner_proc_lock(proc); | |
4317 | list_del_init(&thread->waiting_thread_node); | |
4318 | if (signal_pending(current)) { | |
95c16f9d | 4319 | ret = -EINTR; |
1b77e9dc MC |
4320 | break; |
4321 | } | |
4322 | } | |
4323 | finish_wait(&thread->wait, &wait); | |
4324 | binder_inner_proc_unlock(proc); | |
1b77e9dc MC |
4325 | |
4326 | return ret; | |
4327 | } | |
4328 | ||
44d8047f TK |
4329 | /** |
4330 | * binder_apply_fd_fixups() - finish fd translation | |
8ced0c62 | 4331 | * @proc: binder_proc associated @t->buffer |
44d8047f TK |
4332 | * @t: binder transaction with list of fd fixups |
4333 | * | |
4334 | * Now that we are in the context of the transaction target | |
4335 | * process, we can allocate and install fds. Process the | |
4336 | * list of fds to translate and fixup the buffer with the | |
a8a570c6 | 4337 | * new fds first and only then install the files. |
44d8047f | 4338 | * |
a8a570c6 | 4339 | * If we fail to allocate an fd, skip the install and release |
44d8047f TK |
4340 | * any fds that have already been allocated. |
4341 | */ | |
8ced0c62 TK |
4342 | static int binder_apply_fd_fixups(struct binder_proc *proc, |
4343 | struct binder_transaction *t) | |
44d8047f TK |
4344 | { |
4345 | struct binder_txn_fd_fixup *fixup, *tmp; | |
4346 | int ret = 0; | |
4347 | ||
4348 | list_for_each_entry(fixup, &t->fd_fixups, fixup_entry) { | |
4349 | int fd = get_unused_fd_flags(O_CLOEXEC); | |
44d8047f TK |
4350 | |
4351 | if (fd < 0) { | |
4352 | binder_debug(BINDER_DEBUG_TRANSACTION, | |
4353 | "failed fd fixup txn %d fd %d\n", | |
4354 | t->debug_id, fd); | |
4355 | ret = -ENOMEM; | |
a8a570c6 | 4356 | goto err; |
44d8047f TK |
4357 | } |
4358 | binder_debug(BINDER_DEBUG_TRANSACTION, | |
4359 | "fd fixup txn %d fd %d\n", | |
4360 | t->debug_id, fd); | |
4361 | trace_binder_transaction_fd_recv(t, fd, fixup->offset); | |
a8a570c6 | 4362 | fixup->target_fd = fd; |
bb4a2e48 TK |
4363 | if (binder_alloc_copy_to_buffer(&proc->alloc, t->buffer, |
4364 | fixup->offset, &fd, | |
4365 | sizeof(u32))) { | |
4366 | ret = -EINVAL; | |
a8a570c6 | 4367 | goto err; |
bb4a2e48 | 4368 | } |
44d8047f TK |
4369 | } |
4370 | list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) { | |
a8a570c6 | 4371 | fd_install(fixup->target_fd, fixup->file); |
44d8047f TK |
4372 | list_del(&fixup->fixup_entry); |
4373 | kfree(fixup); | |
4374 | } | |
4375 | ||
4376 | return ret; | |
a8a570c6 CL |
4377 | |
4378 | err: | |
4379 | binder_free_txn_fixups(t); | |
4380 | return ret; | |
44d8047f TK |
4381 | } |
4382 | ||
355b0502 GKH |
4383 | static int binder_thread_read(struct binder_proc *proc, |
4384 | struct binder_thread *thread, | |
da49889d AH |
4385 | binder_uintptr_t binder_buffer, size_t size, |
4386 | binder_size_t *consumed, int non_block) | |
355b0502 | 4387 | { |
da49889d | 4388 | void __user *buffer = (void __user *)(uintptr_t)binder_buffer; |
355b0502 GKH |
4389 | void __user *ptr = buffer + *consumed; |
4390 | void __user *end = buffer + size; | |
4391 | ||
4392 | int ret = 0; | |
4393 | int wait_for_proc_work; | |
4394 | ||
4395 | if (*consumed == 0) { | |
4396 | if (put_user(BR_NOOP, (uint32_t __user *)ptr)) | |
4397 | return -EFAULT; | |
4398 | ptr += sizeof(uint32_t); | |
4399 | } | |
4400 | ||
4401 | retry: | |
0b89d69a | 4402 | binder_inner_proc_lock(proc); |
1b77e9dc | 4403 | wait_for_proc_work = binder_available_for_proc_work_ilocked(thread); |
0b89d69a | 4404 | binder_inner_proc_unlock(proc); |
355b0502 | 4405 | |
355b0502 | 4406 | thread->looper |= BINDER_LOOPER_STATE_WAITING; |
975a1ac9 | 4407 | |
975a1ac9 AH |
4408 | trace_binder_wait_for_work(wait_for_proc_work, |
4409 | !!thread->transaction_stack, | |
72196393 | 4410 | !binder_worklist_empty(proc, &thread->todo)); |
355b0502 GKH |
4411 | if (wait_for_proc_work) { |
4412 | if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED | | |
4413 | BINDER_LOOPER_STATE_ENTERED))) { | |
56b468fc | 4414 | binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n", |
355b0502 GKH |
4415 | proc->pid, thread->pid, thread->looper); |
4416 | wait_event_interruptible(binder_user_error_wait, | |
4417 | binder_stop_on_user_error < 2); | |
4418 | } | |
4419 | binder_set_nice(proc->default_priority); | |
1b77e9dc MC |
4420 | } |
4421 | ||
4422 | if (non_block) { | |
4423 | if (!binder_has_work(thread, wait_for_proc_work)) | |
4424 | ret = -EAGAIN; | |
355b0502 | 4425 | } else { |
1b77e9dc | 4426 | ret = binder_wait_for_work(thread, wait_for_proc_work); |
355b0502 | 4427 | } |
975a1ac9 | 4428 | |
355b0502 GKH |
4429 | thread->looper &= ~BINDER_LOOPER_STATE_WAITING; |
4430 | ||
4431 | if (ret) | |
4432 | return ret; | |
4433 | ||
4434 | while (1) { | |
4435 | uint32_t cmd; | |
ec74136d TK |
4436 | struct binder_transaction_data_secctx tr; |
4437 | struct binder_transaction_data *trd = &tr.transaction_data; | |
72196393 TK |
4438 | struct binder_work *w = NULL; |
4439 | struct list_head *list = NULL; | |
355b0502 | 4440 | struct binder_transaction *t = NULL; |
7a4408c6 | 4441 | struct binder_thread *t_from; |
ec74136d | 4442 | size_t trsize = sizeof(*trd); |
355b0502 | 4443 | |
ed29721e | 4444 | binder_inner_proc_lock(proc); |
72196393 TK |
4445 | if (!binder_worklist_empty_ilocked(&thread->todo)) |
4446 | list = &thread->todo; | |
4447 | else if (!binder_worklist_empty_ilocked(&proc->todo) && | |
4448 | wait_for_proc_work) | |
4449 | list = &proc->todo; | |
4450 | else { | |
4451 | binder_inner_proc_unlock(proc); | |
4452 | ||
395262a9 | 4453 | /* no data added */ |
08dabcee | 4454 | if (ptr - buffer == 4 && !thread->looper_need_return) |
355b0502 GKH |
4455 | goto retry; |
4456 | break; | |
4457 | } | |
4458 | ||
ed29721e TK |
4459 | if (end - ptr < sizeof(tr) + 4) { |
4460 | binder_inner_proc_unlock(proc); | |
355b0502 | 4461 | break; |
ed29721e | 4462 | } |
72196393 | 4463 | w = binder_dequeue_work_head_ilocked(list); |
148ade2c MC |
4464 | if (binder_worklist_empty_ilocked(&thread->todo)) |
4465 | thread->process_todo = false; | |
355b0502 GKH |
4466 | |
4467 | switch (w->type) { | |
4468 | case BINDER_WORK_TRANSACTION: { | |
ed29721e | 4469 | binder_inner_proc_unlock(proc); |
355b0502 GKH |
4470 | t = container_of(w, struct binder_transaction, work); |
4471 | } break; | |
26549d17 TK |
4472 | case BINDER_WORK_RETURN_ERROR: { |
4473 | struct binder_error *e = container_of( | |
4474 | w, struct binder_error, work); | |
4475 | ||
4476 | WARN_ON(e->cmd == BR_OK); | |
ed29721e | 4477 | binder_inner_proc_unlock(proc); |
26549d17 TK |
4478 | if (put_user(e->cmd, (uint32_t __user *)ptr)) |
4479 | return -EFAULT; | |
838d5565 | 4480 | cmd = e->cmd; |
26549d17 TK |
4481 | e->cmd = BR_OK; |
4482 | ptr += sizeof(uint32_t); | |
4483 | ||
838d5565 | 4484 | binder_stat_br(proc, thread, cmd); |
26549d17 | 4485 | } break; |
a7dc1e6f | 4486 | case BINDER_WORK_TRANSACTION_COMPLETE: |
0567461a | 4487 | case BINDER_WORK_TRANSACTION_PENDING: |
a7dc1e6f HL |
4488 | case BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT: { |
4489 | if (proc->oneway_spam_detection_enabled && | |
4490 | w->type == BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT) | |
4491 | cmd = BR_ONEWAY_SPAM_SUSPECT; | |
0567461a LL |
4492 | else if (w->type == BINDER_WORK_TRANSACTION_PENDING) |
4493 | cmd = BR_TRANSACTION_PENDING_FROZEN; | |
a7dc1e6f HL |
4494 | else |
4495 | cmd = BR_TRANSACTION_COMPLETE; | |
ed29721e | 4496 | binder_inner_proc_unlock(proc); |
1909a671 TK |
4497 | kfree(w); |
4498 | binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); | |
355b0502 GKH |
4499 | if (put_user(cmd, (uint32_t __user *)ptr)) |
4500 | return -EFAULT; | |
4501 | ptr += sizeof(uint32_t); | |
4502 | ||
4503 | binder_stat_br(proc, thread, cmd); | |
4504 | binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE, | |
56b468fc | 4505 | "%d:%d BR_TRANSACTION_COMPLETE\n", |
355b0502 | 4506 | proc->pid, thread->pid); |
355b0502 GKH |
4507 | } break; |
4508 | case BINDER_WORK_NODE: { | |
4509 | struct binder_node *node = container_of(w, struct binder_node, work); | |
26b47d8a TK |
4510 | int strong, weak; |
4511 | binder_uintptr_t node_ptr = node->ptr; | |
4512 | binder_uintptr_t node_cookie = node->cookie; | |
4513 | int node_debug_id = node->debug_id; | |
4514 | int has_weak_ref; | |
4515 | int has_strong_ref; | |
4516 | void __user *orig_ptr = ptr; | |
4517 | ||
4518 | BUG_ON(proc != node->proc); | |
4519 | strong = node->internal_strong_refs || | |
4520 | node->local_strong_refs; | |
4521 | weak = !hlist_empty(&node->refs) || | |
adc18842 TK |
4522 | node->local_weak_refs || |
4523 | node->tmp_refs || strong; | |
26b47d8a TK |
4524 | has_strong_ref = node->has_strong_ref; |
4525 | has_weak_ref = node->has_weak_ref; | |
4526 | ||
4527 | if (weak && !has_weak_ref) { | |
355b0502 GKH |
4528 | node->has_weak_ref = 1; |
4529 | node->pending_weak_ref = 1; | |
4530 | node->local_weak_refs++; | |
26b47d8a TK |
4531 | } |
4532 | if (strong && !has_strong_ref) { | |
355b0502 GKH |
4533 | node->has_strong_ref = 1; |
4534 | node->pending_strong_ref = 1; | |
4535 | node->local_strong_refs++; | |
26b47d8a TK |
4536 | } |
4537 | if (!strong && has_strong_ref) | |
355b0502 | 4538 | node->has_strong_ref = 0; |
26b47d8a | 4539 | if (!weak && has_weak_ref) |
355b0502 | 4540 | node->has_weak_ref = 0; |
26b47d8a TK |
4541 | if (!weak && !strong) { |
4542 | binder_debug(BINDER_DEBUG_INTERNAL_REFS, | |
4543 | "%d:%d node %d u%016llx c%016llx deleted\n", | |
4544 | proc->pid, thread->pid, | |
4545 | node_debug_id, | |
4546 | (u64)node_ptr, | |
4547 | (u64)node_cookie); | |
4548 | rb_erase(&node->rb_node, &proc->nodes); | |
ed29721e | 4549 | binder_inner_proc_unlock(proc); |
673068ee TK |
4550 | binder_node_lock(node); |
4551 | /* | |
4552 | * Acquire the node lock before freeing the | |
4553 | * node to serialize with other threads that | |
4554 | * may have been holding the node lock while | |
4555 | * decrementing this node (avoids race where | |
4556 | * this thread frees while the other thread | |
4557 | * is unlocking the node after the final | |
4558 | * decrement) | |
4559 | */ | |
4560 | binder_node_unlock(node); | |
ed29721e TK |
4561 | binder_free_node(node); |
4562 | } else | |
4563 | binder_inner_proc_unlock(proc); | |
4564 | ||
26b47d8a TK |
4565 | if (weak && !has_weak_ref) |
4566 | ret = binder_put_node_cmd( | |
4567 | proc, thread, &ptr, node_ptr, | |
4568 | node_cookie, node_debug_id, | |
4569 | BR_INCREFS, "BR_INCREFS"); | |
4570 | if (!ret && strong && !has_strong_ref) | |
4571 | ret = binder_put_node_cmd( | |
4572 | proc, thread, &ptr, node_ptr, | |
4573 | node_cookie, node_debug_id, | |
4574 | BR_ACQUIRE, "BR_ACQUIRE"); | |
4575 | if (!ret && !strong && has_strong_ref) | |
4576 | ret = binder_put_node_cmd( | |
4577 | proc, thread, &ptr, node_ptr, | |
4578 | node_cookie, node_debug_id, | |
4579 | BR_RELEASE, "BR_RELEASE"); | |
4580 | if (!ret && !weak && has_weak_ref) | |
4581 | ret = binder_put_node_cmd( | |
4582 | proc, thread, &ptr, node_ptr, | |
4583 | node_cookie, node_debug_id, | |
4584 | BR_DECREFS, "BR_DECREFS"); | |
4585 | if (orig_ptr == ptr) | |
4586 | binder_debug(BINDER_DEBUG_INTERNAL_REFS, | |
4587 | "%d:%d node %d u%016llx c%016llx state unchanged\n", | |
4588 | proc->pid, thread->pid, | |
4589 | node_debug_id, | |
4590 | (u64)node_ptr, | |
4591 | (u64)node_cookie); | |
4592 | if (ret) | |
4593 | return ret; | |
355b0502 GKH |
4594 | } break; |
4595 | case BINDER_WORK_DEAD_BINDER: | |
4596 | case BINDER_WORK_DEAD_BINDER_AND_CLEAR: | |
4597 | case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: { | |
4598 | struct binder_ref_death *death; | |
4599 | uint32_t cmd; | |
ab51ec6b | 4600 | binder_uintptr_t cookie; |
355b0502 GKH |
4601 | |
4602 | death = container_of(w, struct binder_ref_death, work); | |
4603 | if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) | |
4604 | cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE; | |
4605 | else | |
4606 | cmd = BR_DEAD_BINDER; | |
ab51ec6b MC |
4607 | cookie = death->cookie; |
4608 | ||
355b0502 | 4609 | binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION, |
da49889d | 4610 | "%d:%d %s %016llx\n", |
355b0502 GKH |
4611 | proc->pid, thread->pid, |
4612 | cmd == BR_DEAD_BINDER ? | |
4613 | "BR_DEAD_BINDER" : | |
4614 | "BR_CLEAR_DEATH_NOTIFICATION_DONE", | |
ab51ec6b | 4615 | (u64)cookie); |
355b0502 | 4616 | if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) { |
ab51ec6b | 4617 | binder_inner_proc_unlock(proc); |
355b0502 GKH |
4618 | kfree(death); |
4619 | binder_stats_deleted(BINDER_STAT_DEATH); | |
ed29721e | 4620 | } else { |
72196393 TK |
4621 | binder_enqueue_work_ilocked( |
4622 | w, &proc->delivered_death); | |
ed29721e TK |
4623 | binder_inner_proc_unlock(proc); |
4624 | } | |
ab51ec6b MC |
4625 | if (put_user(cmd, (uint32_t __user *)ptr)) |
4626 | return -EFAULT; | |
4627 | ptr += sizeof(uint32_t); | |
4628 | if (put_user(cookie, | |
4629 | (binder_uintptr_t __user *)ptr)) | |
4630 | return -EFAULT; | |
4631 | ptr += sizeof(binder_uintptr_t); | |
4632 | binder_stat_br(proc, thread, cmd); | |
355b0502 GKH |
4633 | if (cmd == BR_DEAD_BINDER) |
4634 | goto done; /* DEAD_BINDER notifications can cause transactions */ | |
4635 | } break; | |
324fa64c TK |
4636 | default: |
4637 | binder_inner_proc_unlock(proc); | |
4638 | pr_err("%d:%d: bad work type %d\n", | |
4639 | proc->pid, thread->pid, w->type); | |
4640 | break; | |
355b0502 GKH |
4641 | } |
4642 | ||
4643 | if (!t) | |
4644 | continue; | |
4645 | ||
4646 | BUG_ON(t->buffer == NULL); | |
4647 | if (t->buffer->target_node) { | |
4648 | struct binder_node *target_node = t->buffer->target_node; | |
10f62861 | 4649 | |
ec74136d TK |
4650 | trd->target.ptr = target_node->ptr; |
4651 | trd->cookie = target_node->cookie; | |
355b0502 GKH |
4652 | t->saved_priority = task_nice(current); |
4653 | if (t->priority < target_node->min_priority && | |
4654 | !(t->flags & TF_ONE_WAY)) | |
4655 | binder_set_nice(t->priority); | |
4656 | else if (!(t->flags & TF_ONE_WAY) || | |
4657 | t->saved_priority > target_node->min_priority) | |
4658 | binder_set_nice(target_node->min_priority); | |
4659 | cmd = BR_TRANSACTION; | |
4660 | } else { | |
ec74136d TK |
4661 | trd->target.ptr = 0; |
4662 | trd->cookie = 0; | |
355b0502 GKH |
4663 | cmd = BR_REPLY; |
4664 | } | |
ec74136d TK |
4665 | trd->code = t->code; |
4666 | trd->flags = t->flags; | |
4667 | trd->sender_euid = from_kuid(current_user_ns(), t->sender_euid); | |
355b0502 | 4668 | |
7a4408c6 TK |
4669 | t_from = binder_get_txn_from(t); |
4670 | if (t_from) { | |
4671 | struct task_struct *sender = t_from->proc->tsk; | |
10f62861 | 4672 | |
ec74136d TK |
4673 | trd->sender_pid = |
4674 | task_tgid_nr_ns(sender, | |
4675 | task_active_pid_ns(current)); | |
355b0502 | 4676 | } else { |
ec74136d | 4677 | trd->sender_pid = 0; |
355b0502 GKH |
4678 | } |
4679 | ||
8ced0c62 | 4680 | ret = binder_apply_fd_fixups(proc, t); |
44d8047f TK |
4681 | if (ret) { |
4682 | struct binder_buffer *buffer = t->buffer; | |
4683 | bool oneway = !!(t->flags & TF_ONE_WAY); | |
4684 | int tid = t->debug_id; | |
4685 | ||
4686 | if (t_from) | |
4687 | binder_thread_dec_tmpref(t_from); | |
4688 | buffer->transaction = NULL; | |
4689 | binder_cleanup_transaction(t, "fd fixups failed", | |
4690 | BR_FAILED_REPLY); | |
32e9f56a | 4691 | binder_free_buf(proc, thread, buffer, true); |
44d8047f TK |
4692 | binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, |
4693 | "%d:%d %stransaction %d fd fixups failed %d/%d, line %d\n", | |
4694 | proc->pid, thread->pid, | |
4695 | oneway ? "async " : | |
4696 | (cmd == BR_REPLY ? "reply " : ""), | |
4697 | tid, BR_FAILED_REPLY, ret, __LINE__); | |
4698 | if (cmd == BR_REPLY) { | |
4699 | cmd = BR_FAILED_REPLY; | |
4700 | if (put_user(cmd, (uint32_t __user *)ptr)) | |
4701 | return -EFAULT; | |
4702 | ptr += sizeof(uint32_t); | |
4703 | binder_stat_br(proc, thread, cmd); | |
4704 | break; | |
4705 | } | |
4706 | continue; | |
4707 | } | |
ec74136d TK |
4708 | trd->data_size = t->buffer->data_size; |
4709 | trd->offsets_size = t->buffer->offsets_size; | |
df9aabea | 4710 | trd->data.ptr.buffer = t->buffer->user_data; |
ec74136d | 4711 | trd->data.ptr.offsets = trd->data.ptr.buffer + |
355b0502 GKH |
4712 | ALIGN(t->buffer->data_size, |
4713 | sizeof(void *)); | |
4714 | ||
ec74136d TK |
4715 | tr.secctx = t->security_ctx; |
4716 | if (t->security_ctx) { | |
4717 | cmd = BR_TRANSACTION_SEC_CTX; | |
4718 | trsize = sizeof(tr); | |
4719 | } | |
7a4408c6 TK |
4720 | if (put_user(cmd, (uint32_t __user *)ptr)) { |
4721 | if (t_from) | |
4722 | binder_thread_dec_tmpref(t_from); | |
fb2c4452 MC |
4723 | |
4724 | binder_cleanup_transaction(t, "put_user failed", | |
4725 | BR_FAILED_REPLY); | |
4726 | ||
355b0502 | 4727 | return -EFAULT; |
7a4408c6 | 4728 | } |
355b0502 | 4729 | ptr += sizeof(uint32_t); |
ec74136d | 4730 | if (copy_to_user(ptr, &tr, trsize)) { |
7a4408c6 TK |
4731 | if (t_from) |
4732 | binder_thread_dec_tmpref(t_from); | |
fb2c4452 MC |
4733 | |
4734 | binder_cleanup_transaction(t, "copy_to_user failed", | |
4735 | BR_FAILED_REPLY); | |
4736 | ||
355b0502 | 4737 | return -EFAULT; |
7a4408c6 | 4738 | } |
ec74136d | 4739 | ptr += trsize; |
355b0502 | 4740 | |
975a1ac9 | 4741 | trace_binder_transaction_received(t); |
355b0502 GKH |
4742 | binder_stat_br(proc, thread, cmd); |
4743 | binder_debug(BINDER_DEBUG_TRANSACTION, | |
da486496 | 4744 | "%d:%d %s %d %d:%d, cmd %u size %zd-%zd ptr %016llx-%016llx\n", |
355b0502 GKH |
4745 | proc->pid, thread->pid, |
4746 | (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" : | |
ec74136d TK |
4747 | (cmd == BR_TRANSACTION_SEC_CTX) ? |
4748 | "BR_TRANSACTION_SEC_CTX" : "BR_REPLY", | |
7a4408c6 TK |
4749 | t->debug_id, t_from ? t_from->proc->pid : 0, |
4750 | t_from ? t_from->pid : 0, cmd, | |
355b0502 | 4751 | t->buffer->data_size, t->buffer->offsets_size, |
ec74136d TK |
4752 | (u64)trd->data.ptr.buffer, |
4753 | (u64)trd->data.ptr.offsets); | |
355b0502 | 4754 | |
7a4408c6 TK |
4755 | if (t_from) |
4756 | binder_thread_dec_tmpref(t_from); | |
355b0502 | 4757 | t->buffer->allow_user_free = 1; |
ec74136d | 4758 | if (cmd != BR_REPLY && !(t->flags & TF_ONE_WAY)) { |
0b89d69a | 4759 | binder_inner_proc_lock(thread->proc); |
355b0502 GKH |
4760 | t->to_parent = thread->transaction_stack; |
4761 | t->to_thread = thread; | |
4762 | thread->transaction_stack = t; | |
0b89d69a | 4763 | binder_inner_proc_unlock(thread->proc); |
355b0502 | 4764 | } else { |
b6d282ce | 4765 | binder_free_transaction(t); |
355b0502 GKH |
4766 | } |
4767 | break; | |
4768 | } | |
4769 | ||
4770 | done: | |
4771 | ||
4772 | *consumed = ptr - buffer; | |
b3e68612 | 4773 | binder_inner_proc_lock(proc); |
1b77e9dc MC |
4774 | if (proc->requested_threads == 0 && |
4775 | list_empty(&thread->proc->waiting_threads) && | |
355b0502 GKH |
4776 | proc->requested_threads_started < proc->max_threads && |
4777 | (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | | |
4778 | BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */ | |
4779 | /*spawn a new thread if we leave this out */) { | |
4780 | proc->requested_threads++; | |
b3e68612 | 4781 | binder_inner_proc_unlock(proc); |
355b0502 | 4782 | binder_debug(BINDER_DEBUG_THREADS, |
56b468fc | 4783 | "%d:%d BR_SPAWN_LOOPER\n", |
355b0502 GKH |
4784 | proc->pid, thread->pid); |
4785 | if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer)) | |
4786 | return -EFAULT; | |
89334ab4 | 4787 | binder_stat_br(proc, thread, BR_SPAWN_LOOPER); |
b3e68612 TK |
4788 | } else |
4789 | binder_inner_proc_unlock(proc); | |
355b0502 GKH |
4790 | return 0; |
4791 | } | |
4792 | ||
72196393 TK |
4793 | static void binder_release_work(struct binder_proc *proc, |
4794 | struct list_head *list) | |
355b0502 GKH |
4795 | { |
4796 | struct binder_work *w; | |
f3277cbf | 4797 | enum binder_work_type wtype; |
10f62861 | 4798 | |
72196393 | 4799 | while (1) { |
f3277cbf TK |
4800 | binder_inner_proc_lock(proc); |
4801 | w = binder_dequeue_work_head_ilocked(list); | |
4802 | wtype = w ? w->type : 0; | |
4803 | binder_inner_proc_unlock(proc); | |
72196393 TK |
4804 | if (!w) |
4805 | return; | |
4806 | ||
f3277cbf | 4807 | switch (wtype) { |
355b0502 GKH |
4808 | case BINDER_WORK_TRANSACTION: { |
4809 | struct binder_transaction *t; | |
4810 | ||
4811 | t = container_of(w, struct binder_transaction, work); | |
fb2c4452 MC |
4812 | |
4813 | binder_cleanup_transaction(t, "process died.", | |
4814 | BR_DEAD_REPLY); | |
355b0502 | 4815 | } break; |
26549d17 TK |
4816 | case BINDER_WORK_RETURN_ERROR: { |
4817 | struct binder_error *e = container_of( | |
4818 | w, struct binder_error, work); | |
4819 | ||
4820 | binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, | |
4821 | "undelivered TRANSACTION_ERROR: %u\n", | |
4822 | e->cmd); | |
4823 | } break; | |
1aa3aaf8 CL |
4824 | case BINDER_WORK_TRANSACTION_PENDING: |
4825 | case BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT: | |
355b0502 | 4826 | case BINDER_WORK_TRANSACTION_COMPLETE: { |
675d66b0 | 4827 | binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, |
56b468fc | 4828 | "undelivered TRANSACTION_COMPLETE\n"); |
355b0502 GKH |
4829 | kfree(w); |
4830 | binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); | |
4831 | } break; | |
675d66b0 AH |
4832 | case BINDER_WORK_DEAD_BINDER_AND_CLEAR: |
4833 | case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: { | |
4834 | struct binder_ref_death *death; | |
4835 | ||
4836 | death = container_of(w, struct binder_ref_death, work); | |
4837 | binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, | |
da49889d AH |
4838 | "undelivered death notification, %016llx\n", |
4839 | (u64)death->cookie); | |
675d66b0 AH |
4840 | kfree(death); |
4841 | binder_stats_deleted(BINDER_STAT_DEATH); | |
4842 | } break; | |
f3277cbf TK |
4843 | case BINDER_WORK_NODE: |
4844 | break; | |
355b0502 | 4845 | default: |
56b468fc | 4846 | pr_err("unexpected work type, %d, not freed\n", |
f3277cbf | 4847 | wtype); |
355b0502 GKH |
4848 | break; |
4849 | } | |
4850 | } | |
4851 | ||
4852 | } | |
4853 | ||
7bd7b0e6 TK |
4854 | static struct binder_thread *binder_get_thread_ilocked( |
4855 | struct binder_proc *proc, struct binder_thread *new_thread) | |
355b0502 GKH |
4856 | { |
4857 | struct binder_thread *thread = NULL; | |
4858 | struct rb_node *parent = NULL; | |
4859 | struct rb_node **p = &proc->threads.rb_node; | |
4860 | ||
4861 | while (*p) { | |
4862 | parent = *p; | |
4863 | thread = rb_entry(parent, struct binder_thread, rb_node); | |
4864 | ||
4865 | if (current->pid < thread->pid) | |
4866 | p = &(*p)->rb_left; | |
4867 | else if (current->pid > thread->pid) | |
4868 | p = &(*p)->rb_right; | |
4869 | else | |
7bd7b0e6 | 4870 | return thread; |
355b0502 | 4871 | } |
7bd7b0e6 TK |
4872 | if (!new_thread) |
4873 | return NULL; | |
4874 | thread = new_thread; | |
4875 | binder_stats_created(BINDER_STAT_THREAD); | |
4876 | thread->proc = proc; | |
4877 | thread->pid = current->pid; | |
4878 | atomic_set(&thread->tmp_ref, 0); | |
4879 | init_waitqueue_head(&thread->wait); | |
4880 | INIT_LIST_HEAD(&thread->todo); | |
4881 | rb_link_node(&thread->rb_node, parent, p); | |
4882 | rb_insert_color(&thread->rb_node, &proc->threads); | |
4883 | thread->looper_need_return = true; | |
4884 | thread->return_error.work.type = BINDER_WORK_RETURN_ERROR; | |
4885 | thread->return_error.cmd = BR_OK; | |
4886 | thread->reply_error.work.type = BINDER_WORK_RETURN_ERROR; | |
4887 | thread->reply_error.cmd = BR_OK; | |
bd32889e | 4888 | thread->ee.command = BR_OK; |
1b77e9dc | 4889 | INIT_LIST_HEAD(&new_thread->waiting_thread_node); |
7bd7b0e6 TK |
4890 | return thread; |
4891 | } | |
4892 | ||
4893 | static struct binder_thread *binder_get_thread(struct binder_proc *proc) | |
4894 | { | |
4895 | struct binder_thread *thread; | |
4896 | struct binder_thread *new_thread; | |
4897 | ||
4898 | binder_inner_proc_lock(proc); | |
4899 | thread = binder_get_thread_ilocked(proc, NULL); | |
4900 | binder_inner_proc_unlock(proc); | |
4901 | if (!thread) { | |
4902 | new_thread = kzalloc(sizeof(*thread), GFP_KERNEL); | |
4903 | if (new_thread == NULL) | |
355b0502 | 4904 | return NULL; |
7bd7b0e6 TK |
4905 | binder_inner_proc_lock(proc); |
4906 | thread = binder_get_thread_ilocked(proc, new_thread); | |
4907 | binder_inner_proc_unlock(proc); | |
4908 | if (thread != new_thread) | |
4909 | kfree(new_thread); | |
355b0502 GKH |
4910 | } |
4911 | return thread; | |
4912 | } | |
4913 | ||
7a4408c6 TK |
4914 | static void binder_free_proc(struct binder_proc *proc) |
4915 | { | |
d35d3660 TK |
4916 | struct binder_device *device; |
4917 | ||
7a4408c6 TK |
4918 | BUG_ON(!list_empty(&proc->todo)); |
4919 | BUG_ON(!list_empty(&proc->delivered_death)); | |
432ff1e9 MB |
4920 | if (proc->outstanding_txns) |
4921 | pr_warn("%s: Unexpected outstanding_txns %d\n", | |
4922 | __func__, proc->outstanding_txns); | |
d35d3660 TK |
4923 | device = container_of(proc->context, struct binder_device, context); |
4924 | if (refcount_dec_and_test(&device->ref)) { | |
4925 | kfree(proc->context->name); | |
4926 | kfree(device); | |
4927 | } | |
7a4408c6 TK |
4928 | binder_alloc_deferred_release(&proc->alloc); |
4929 | put_task_struct(proc->tsk); | |
29bc22ac | 4930 | put_cred(proc->cred); |
7a4408c6 TK |
4931 | binder_stats_deleted(BINDER_STAT_PROC); |
4932 | kfree(proc); | |
4933 | } | |
4934 | ||
4935 | static void binder_free_thread(struct binder_thread *thread) | |
4936 | { | |
4937 | BUG_ON(!list_empty(&thread->todo)); | |
4938 | binder_stats_deleted(BINDER_STAT_THREAD); | |
4939 | binder_proc_dec_tmpref(thread->proc); | |
4940 | kfree(thread); | |
4941 | } | |
4942 | ||
4943 | static int binder_thread_release(struct binder_proc *proc, | |
4944 | struct binder_thread *thread) | |
355b0502 GKH |
4945 | { |
4946 | struct binder_transaction *t; | |
4947 | struct binder_transaction *send_reply = NULL; | |
4948 | int active_transactions = 0; | |
7a4408c6 | 4949 | struct binder_transaction *last_t = NULL; |
355b0502 | 4950 | |
7bd7b0e6 | 4951 | binder_inner_proc_lock(thread->proc); |
7a4408c6 TK |
4952 | /* |
4953 | * take a ref on the proc so it survives | |
4954 | * after we remove this thread from proc->threads. | |
4955 | * The corresponding dec is when we actually | |
4956 | * free the thread in binder_free_thread() | |
4957 | */ | |
4958 | proc->tmp_ref++; | |
4959 | /* | |
4960 | * take a ref on this thread to ensure it | |
4961 | * survives while we are releasing it | |
4962 | */ | |
4963 | atomic_inc(&thread->tmp_ref); | |
355b0502 GKH |
4964 | rb_erase(&thread->rb_node, &proc->threads); |
4965 | t = thread->transaction_stack; | |
7a4408c6 TK |
4966 | if (t) { |
4967 | spin_lock(&t->lock); | |
4968 | if (t->to_thread == thread) | |
4969 | send_reply = t; | |
324fa64c TK |
4970 | } else { |
4971 | __acquire(&t->lock); | |
7a4408c6 TK |
4972 | } |
4973 | thread->is_dead = true; | |
4974 | ||
355b0502 | 4975 | while (t) { |
7a4408c6 | 4976 | last_t = t; |
355b0502 GKH |
4977 | active_transactions++; |
4978 | binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, | |
56b468fc AS |
4979 | "release %d:%d transaction %d %s, still active\n", |
4980 | proc->pid, thread->pid, | |
355b0502 GKH |
4981 | t->debug_id, |
4982 | (t->to_thread == thread) ? "in" : "out"); | |
4983 | ||
4984 | if (t->to_thread == thread) { | |
432ff1e9 | 4985 | thread->proc->outstanding_txns--; |
355b0502 GKH |
4986 | t->to_proc = NULL; |
4987 | t->to_thread = NULL; | |
4988 | if (t->buffer) { | |
4989 | t->buffer->transaction = NULL; | |
4990 | t->buffer = NULL; | |
4991 | } | |
4992 | t = t->to_parent; | |
4993 | } else if (t->from == thread) { | |
4994 | t->from = NULL; | |
4995 | t = t->from_parent; | |
4996 | } else | |
4997 | BUG(); | |
7a4408c6 TK |
4998 | spin_unlock(&last_t->lock); |
4999 | if (t) | |
5000 | spin_lock(&t->lock); | |
324fa64c TK |
5001 | else |
5002 | __acquire(&t->lock); | |
355b0502 | 5003 | } |
324fa64c TK |
5004 | /* annotation for sparse, lock not acquired in last iteration above */ |
5005 | __release(&t->lock); | |
f5cb779b MC |
5006 | |
5007 | /* | |
a880b28a EB |
5008 | * If this thread used poll, make sure we remove the waitqueue from any |
5009 | * poll data structures holding it. | |
f5cb779b | 5010 | */ |
a880b28a EB |
5011 | if (thread->looper & BINDER_LOOPER_STATE_POLL) |
5012 | wake_up_pollfree(&thread->wait); | |
f5cb779b | 5013 | |
7bd7b0e6 | 5014 | binder_inner_proc_unlock(thread->proc); |
7a4408c6 | 5015 | |
5eeb2ca0 | 5016 | /* |
a880b28a EB |
5017 | * This is needed to avoid races between wake_up_pollfree() above and |
5018 | * someone else removing the last entry from the queue for other reasons | |
5019 | * (e.g. ep_remove_wait_queue() being called due to an epoll file | |
5020 | * descriptor being closed). Such other users hold an RCU read lock, so | |
5021 | * we can be sure they're done after we call synchronize_rcu(). | |
5eeb2ca0 MC |
5022 | */ |
5023 | if (thread->looper & BINDER_LOOPER_STATE_POLL) | |
5024 | synchronize_rcu(); | |
5025 | ||
355b0502 GKH |
5026 | if (send_reply) |
5027 | binder_send_failed_reply(send_reply, BR_DEAD_REPLY); | |
72196393 | 5028 | binder_release_work(proc, &thread->todo); |
7a4408c6 | 5029 | binder_thread_dec_tmpref(thread); |
355b0502 GKH |
5030 | return active_transactions; |
5031 | } | |
5032 | ||
afc9a42b | 5033 | static __poll_t binder_poll(struct file *filp, |
355b0502 GKH |
5034 | struct poll_table_struct *wait) |
5035 | { | |
5036 | struct binder_proc *proc = filp->private_data; | |
5037 | struct binder_thread *thread = NULL; | |
1b77e9dc | 5038 | bool wait_for_proc_work; |
355b0502 | 5039 | |
355b0502 | 5040 | thread = binder_get_thread(proc); |
f8898267 | 5041 | if (!thread) |
6ac061db | 5042 | return EPOLLERR; |
355b0502 | 5043 | |
0b89d69a | 5044 | binder_inner_proc_lock(thread->proc); |
1b77e9dc MC |
5045 | thread->looper |= BINDER_LOOPER_STATE_POLL; |
5046 | wait_for_proc_work = binder_available_for_proc_work_ilocked(thread); | |
5047 | ||
0b89d69a | 5048 | binder_inner_proc_unlock(thread->proc); |
975a1ac9 | 5049 | |
1b77e9dc MC |
5050 | poll_wait(filp, &thread->wait, wait); |
5051 | ||
66b83a4c | 5052 | if (binder_has_work(thread, wait_for_proc_work)) |
a9a08845 | 5053 | return EPOLLIN; |
1b77e9dc | 5054 | |
355b0502 GKH |
5055 | return 0; |
5056 | } | |
5057 | ||
7feb35bc | 5058 | static int binder_ioctl_write_read(struct file *filp, unsigned long arg, |
78260ac6 TR |
5059 | struct binder_thread *thread) |
5060 | { | |
5061 | int ret = 0; | |
5062 | struct binder_proc *proc = filp->private_data; | |
78260ac6 TR |
5063 | void __user *ubuf = (void __user *)arg; |
5064 | struct binder_write_read bwr; | |
5065 | ||
78260ac6 TR |
5066 | if (copy_from_user(&bwr, ubuf, sizeof(bwr))) { |
5067 | ret = -EFAULT; | |
5068 | goto out; | |
5069 | } | |
5070 | binder_debug(BINDER_DEBUG_READ_WRITE, | |
5071 | "%d:%d write %lld at %016llx, read %lld at %016llx\n", | |
5072 | proc->pid, thread->pid, | |
5073 | (u64)bwr.write_size, (u64)bwr.write_buffer, | |
5074 | (u64)bwr.read_size, (u64)bwr.read_buffer); | |
5075 | ||
5076 | if (bwr.write_size > 0) { | |
5077 | ret = binder_thread_write(proc, thread, | |
5078 | bwr.write_buffer, | |
5079 | bwr.write_size, | |
5080 | &bwr.write_consumed); | |
5081 | trace_binder_write_done(ret); | |
5082 | if (ret < 0) { | |
5083 | bwr.read_consumed = 0; | |
5084 | if (copy_to_user(ubuf, &bwr, sizeof(bwr))) | |
5085 | ret = -EFAULT; | |
5086 | goto out; | |
5087 | } | |
5088 | } | |
5089 | if (bwr.read_size > 0) { | |
5090 | ret = binder_thread_read(proc, thread, bwr.read_buffer, | |
5091 | bwr.read_size, | |
5092 | &bwr.read_consumed, | |
5093 | filp->f_flags & O_NONBLOCK); | |
5094 | trace_binder_read_done(ret); | |
1b77e9dc MC |
5095 | binder_inner_proc_lock(proc); |
5096 | if (!binder_worklist_empty_ilocked(&proc->todo)) | |
408c68b1 | 5097 | binder_wakeup_proc_ilocked(proc); |
1b77e9dc | 5098 | binder_inner_proc_unlock(proc); |
78260ac6 TR |
5099 | if (ret < 0) { |
5100 | if (copy_to_user(ubuf, &bwr, sizeof(bwr))) | |
5101 | ret = -EFAULT; | |
5102 | goto out; | |
5103 | } | |
5104 | } | |
5105 | binder_debug(BINDER_DEBUG_READ_WRITE, | |
5106 | "%d:%d wrote %lld of %lld, read return %lld of %lld\n", | |
5107 | proc->pid, thread->pid, | |
5108 | (u64)bwr.write_consumed, (u64)bwr.write_size, | |
5109 | (u64)bwr.read_consumed, (u64)bwr.read_size); | |
5110 | if (copy_to_user(ubuf, &bwr, sizeof(bwr))) { | |
5111 | ret = -EFAULT; | |
5112 | goto out; | |
5113 | } | |
5114 | out: | |
5115 | return ret; | |
5116 | } | |
5117 | ||
ec74136d TK |
5118 | static int binder_ioctl_set_ctx_mgr(struct file *filp, |
5119 | struct flat_binder_object *fbo) | |
78260ac6 TR |
5120 | { |
5121 | int ret = 0; | |
5122 | struct binder_proc *proc = filp->private_data; | |
342e5c90 | 5123 | struct binder_context *context = proc->context; |
c44b1231 | 5124 | struct binder_node *new_node; |
78260ac6 TR |
5125 | kuid_t curr_euid = current_euid(); |
5126 | ||
c44b1231 | 5127 | mutex_lock(&context->context_mgr_node_lock); |
342e5c90 | 5128 | if (context->binder_context_mgr_node) { |
78260ac6 TR |
5129 | pr_err("BINDER_SET_CONTEXT_MGR already set\n"); |
5130 | ret = -EBUSY; | |
5131 | goto out; | |
5132 | } | |
52f88693 | 5133 | ret = security_binder_set_context_mgr(proc->cred); |
79af7307 SS |
5134 | if (ret < 0) |
5135 | goto out; | |
342e5c90 MC |
5136 | if (uid_valid(context->binder_context_mgr_uid)) { |
5137 | if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) { | |
78260ac6 TR |
5138 | pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n", |
5139 | from_kuid(&init_user_ns, curr_euid), | |
5140 | from_kuid(&init_user_ns, | |
342e5c90 | 5141 | context->binder_context_mgr_uid)); |
78260ac6 TR |
5142 | ret = -EPERM; |
5143 | goto out; | |
5144 | } | |
5145 | } else { | |
342e5c90 | 5146 | context->binder_context_mgr_uid = curr_euid; |
78260ac6 | 5147 | } |
ec74136d | 5148 | new_node = binder_new_node(proc, fbo); |
c44b1231 | 5149 | if (!new_node) { |
78260ac6 TR |
5150 | ret = -ENOMEM; |
5151 | goto out; | |
5152 | } | |
673068ee | 5153 | binder_node_lock(new_node); |
c44b1231 TK |
5154 | new_node->local_weak_refs++; |
5155 | new_node->local_strong_refs++; | |
5156 | new_node->has_strong_ref = 1; | |
5157 | new_node->has_weak_ref = 1; | |
5158 | context->binder_context_mgr_node = new_node; | |
673068ee | 5159 | binder_node_unlock(new_node); |
adc18842 | 5160 | binder_put_node(new_node); |
78260ac6 | 5161 | out: |
c44b1231 | 5162 | mutex_unlock(&context->context_mgr_node_lock); |
78260ac6 TR |
5163 | return ret; |
5164 | } | |
5165 | ||
b7e6a896 MC |
5166 | static int binder_ioctl_get_node_info_for_ref(struct binder_proc *proc, |
5167 | struct binder_node_info_for_ref *info) | |
5168 | { | |
5169 | struct binder_node *node; | |
5170 | struct binder_context *context = proc->context; | |
5171 | __u32 handle = info->handle; | |
5172 | ||
5173 | if (info->strong_count || info->weak_count || info->reserved1 || | |
5174 | info->reserved2 || info->reserved3) { | |
5175 | binder_user_error("%d BINDER_GET_NODE_INFO_FOR_REF: only handle may be non-zero.", | |
5176 | proc->pid); | |
5177 | return -EINVAL; | |
5178 | } | |
5179 | ||
5180 | /* This ioctl may only be used by the context manager */ | |
5181 | mutex_lock(&context->context_mgr_node_lock); | |
5182 | if (!context->binder_context_mgr_node || | |
5183 | context->binder_context_mgr_node->proc != proc) { | |
5184 | mutex_unlock(&context->context_mgr_node_lock); | |
5185 | return -EPERM; | |
5186 | } | |
5187 | mutex_unlock(&context->context_mgr_node_lock); | |
5188 | ||
5189 | node = binder_get_node_from_ref(proc, handle, true, NULL); | |
5190 | if (!node) | |
5191 | return -EINVAL; | |
5192 | ||
5193 | info->strong_count = node->local_strong_refs + | |
5194 | node->internal_strong_refs; | |
5195 | info->weak_count = node->local_weak_refs; | |
5196 | ||
5197 | binder_put_node(node); | |
5198 | ||
5199 | return 0; | |
5200 | } | |
5201 | ||
abcc6153 CC |
5202 | static int binder_ioctl_get_node_debug_info(struct binder_proc *proc, |
5203 | struct binder_node_debug_info *info) | |
5204 | { | |
5205 | struct rb_node *n; | |
5206 | binder_uintptr_t ptr = info->ptr; | |
5207 | ||
5208 | memset(info, 0, sizeof(*info)); | |
5209 | ||
5210 | binder_inner_proc_lock(proc); | |
5211 | for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) { | |
5212 | struct binder_node *node = rb_entry(n, struct binder_node, | |
5213 | rb_node); | |
5214 | if (node->ptr > ptr) { | |
5215 | info->ptr = node->ptr; | |
5216 | info->cookie = node->cookie; | |
5217 | info->has_strong_ref = node->has_strong_ref; | |
5218 | info->has_weak_ref = node->has_weak_ref; | |
5219 | break; | |
5220 | } | |
5221 | } | |
5222 | binder_inner_proc_unlock(proc); | |
5223 | ||
5224 | return 0; | |
5225 | } | |
5226 | ||
b564171a LL |
5227 | static bool binder_txns_pending_ilocked(struct binder_proc *proc) |
5228 | { | |
5229 | struct rb_node *n; | |
5230 | struct binder_thread *thread; | |
5231 | ||
5232 | if (proc->outstanding_txns > 0) | |
5233 | return true; | |
5234 | ||
5235 | for (n = rb_first(&proc->threads); n; n = rb_next(n)) { | |
5236 | thread = rb_entry(n, struct binder_thread, rb_node); | |
5237 | if (thread->transaction_stack) | |
5238 | return true; | |
5239 | } | |
5240 | return false; | |
5241 | } | |
5242 | ||
432ff1e9 MB |
5243 | static int binder_ioctl_freeze(struct binder_freeze_info *info, |
5244 | struct binder_proc *target_proc) | |
5245 | { | |
5246 | int ret = 0; | |
5247 | ||
5248 | if (!info->enable) { | |
5249 | binder_inner_proc_lock(target_proc); | |
ae28c1be MB |
5250 | target_proc->sync_recv = false; |
5251 | target_proc->async_recv = false; | |
432ff1e9 MB |
5252 | target_proc->is_frozen = false; |
5253 | binder_inner_proc_unlock(target_proc); | |
5254 | return 0; | |
5255 | } | |
5256 | ||
5257 | /* | |
5258 | * Freezing the target. Prevent new transactions by | |
5259 | * setting frozen state. If timeout specified, wait | |
5260 | * for transactions to drain. | |
5261 | */ | |
5262 | binder_inner_proc_lock(target_proc); | |
ae28c1be MB |
5263 | target_proc->sync_recv = false; |
5264 | target_proc->async_recv = false; | |
432ff1e9 MB |
5265 | target_proc->is_frozen = true; |
5266 | binder_inner_proc_unlock(target_proc); | |
5267 | ||
5268 | if (info->timeout_ms > 0) | |
5269 | ret = wait_event_interruptible_timeout( | |
5270 | target_proc->freeze_wait, | |
5271 | (!target_proc->outstanding_txns), | |
5272 | msecs_to_jiffies(info->timeout_ms)); | |
5273 | ||
b564171a LL |
5274 | /* Check pending transactions that wait for reply */ |
5275 | if (ret >= 0) { | |
5276 | binder_inner_proc_lock(target_proc); | |
5277 | if (binder_txns_pending_ilocked(target_proc)) | |
5278 | ret = -EAGAIN; | |
5279 | binder_inner_proc_unlock(target_proc); | |
5280 | } | |
432ff1e9 MB |
5281 | |
5282 | if (ret < 0) { | |
5283 | binder_inner_proc_lock(target_proc); | |
5284 | target_proc->is_frozen = false; | |
5285 | binder_inner_proc_unlock(target_proc); | |
5286 | } | |
5287 | ||
5288 | return ret; | |
5289 | } | |
5290 | ||
ae28c1be MB |
5291 | static int binder_ioctl_get_freezer_info( |
5292 | struct binder_frozen_status_info *info) | |
5293 | { | |
5294 | struct binder_proc *target_proc; | |
5295 | bool found = false; | |
b564171a | 5296 | __u32 txns_pending; |
ae28c1be MB |
5297 | |
5298 | info->sync_recv = 0; | |
5299 | info->async_recv = 0; | |
5300 | ||
5301 | mutex_lock(&binder_procs_lock); | |
5302 | hlist_for_each_entry(target_proc, &binder_procs, proc_node) { | |
5303 | if (target_proc->pid == info->pid) { | |
5304 | found = true; | |
5305 | binder_inner_proc_lock(target_proc); | |
b564171a LL |
5306 | txns_pending = binder_txns_pending_ilocked(target_proc); |
5307 | info->sync_recv |= target_proc->sync_recv | | |
5308 | (txns_pending << 1); | |
ae28c1be MB |
5309 | info->async_recv |= target_proc->async_recv; |
5310 | binder_inner_proc_unlock(target_proc); | |
5311 | } | |
5312 | } | |
5313 | mutex_unlock(&binder_procs_lock); | |
5314 | ||
5315 | if (!found) | |
5316 | return -EINVAL; | |
5317 | ||
5318 | return 0; | |
5319 | } | |
5320 | ||
bd32889e CL |
5321 | static int binder_ioctl_get_extended_error(struct binder_thread *thread, |
5322 | void __user *ubuf) | |
5323 | { | |
aed86f8a | 5324 | struct binder_extended_error ee; |
bd32889e CL |
5325 | |
5326 | binder_inner_proc_lock(thread->proc); | |
aed86f8a SS |
5327 | ee = thread->ee; |
5328 | binder_set_extended_error(&thread->ee, 0, BR_OK, 0); | |
bd32889e CL |
5329 | binder_inner_proc_unlock(thread->proc); |
5330 | ||
aed86f8a SS |
5331 | if (copy_to_user(ubuf, &ee, sizeof(ee))) |
5332 | return -EFAULT; | |
5333 | ||
bd32889e CL |
5334 | return 0; |
5335 | } | |
5336 | ||
355b0502 GKH |
5337 | static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
5338 | { | |
5339 | int ret; | |
5340 | struct binder_proc *proc = filp->private_data; | |
5341 | struct binder_thread *thread; | |
355b0502 GKH |
5342 | void __user *ubuf = (void __user *)arg; |
5343 | ||
78260ac6 TR |
5344 | /*pr_info("binder_ioctl: %d:%d %x %lx\n", |
5345 | proc->pid, current->pid, cmd, arg);*/ | |
355b0502 | 5346 | |
4175e2b4 SY |
5347 | binder_selftest_alloc(&proc->alloc); |
5348 | ||
975a1ac9 AH |
5349 | trace_binder_ioctl(cmd, arg); |
5350 | ||
355b0502 GKH |
5351 | ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2); |
5352 | if (ret) | |
975a1ac9 | 5353 | goto err_unlocked; |
355b0502 | 5354 | |
355b0502 GKH |
5355 | thread = binder_get_thread(proc); |
5356 | if (thread == NULL) { | |
5357 | ret = -ENOMEM; | |
5358 | goto err; | |
5359 | } | |
5360 | ||
5361 | switch (cmd) { | |
78260ac6 | 5362 | case BINDER_WRITE_READ: |
7feb35bc | 5363 | ret = binder_ioctl_write_read(filp, arg, thread); |
78260ac6 | 5364 | if (ret) |
355b0502 | 5365 | goto err; |
355b0502 | 5366 | break; |
b3e68612 TK |
5367 | case BINDER_SET_MAX_THREADS: { |
5368 | int max_threads; | |
5369 | ||
5370 | if (copy_from_user(&max_threads, ubuf, | |
5371 | sizeof(max_threads))) { | |
355b0502 GKH |
5372 | ret = -EINVAL; |
5373 | goto err; | |
5374 | } | |
b3e68612 TK |
5375 | binder_inner_proc_lock(proc); |
5376 | proc->max_threads = max_threads; | |
5377 | binder_inner_proc_unlock(proc); | |
355b0502 | 5378 | break; |
b3e68612 | 5379 | } |
ec74136d TK |
5380 | case BINDER_SET_CONTEXT_MGR_EXT: { |
5381 | struct flat_binder_object fbo; | |
5382 | ||
5383 | if (copy_from_user(&fbo, ubuf, sizeof(fbo))) { | |
5384 | ret = -EINVAL; | |
5385 | goto err; | |
5386 | } | |
5387 | ret = binder_ioctl_set_ctx_mgr(filp, &fbo); | |
5388 | if (ret) | |
5389 | goto err; | |
5390 | break; | |
5391 | } | |
355b0502 | 5392 | case BINDER_SET_CONTEXT_MGR: |
ec74136d | 5393 | ret = binder_ioctl_set_ctx_mgr(filp, NULL); |
78260ac6 | 5394 | if (ret) |
355b0502 | 5395 | goto err; |
355b0502 GKH |
5396 | break; |
5397 | case BINDER_THREAD_EXIT: | |
56b468fc | 5398 | binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n", |
355b0502 | 5399 | proc->pid, thread->pid); |
7a4408c6 | 5400 | binder_thread_release(proc, thread); |
355b0502 GKH |
5401 | thread = NULL; |
5402 | break; | |
36c89c0a MM |
5403 | case BINDER_VERSION: { |
5404 | struct binder_version __user *ver = ubuf; | |
5405 | ||
36c89c0a MM |
5406 | if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, |
5407 | &ver->protocol_version)) { | |
355b0502 GKH |
5408 | ret = -EINVAL; |
5409 | goto err; | |
5410 | } | |
5411 | break; | |
36c89c0a | 5412 | } |
b7e6a896 MC |
5413 | case BINDER_GET_NODE_INFO_FOR_REF: { |
5414 | struct binder_node_info_for_ref info; | |
5415 | ||
5416 | if (copy_from_user(&info, ubuf, sizeof(info))) { | |
5417 | ret = -EFAULT; | |
5418 | goto err; | |
5419 | } | |
5420 | ||
5421 | ret = binder_ioctl_get_node_info_for_ref(proc, &info); | |
5422 | if (ret < 0) | |
5423 | goto err; | |
5424 | ||
5425 | if (copy_to_user(ubuf, &info, sizeof(info))) { | |
5426 | ret = -EFAULT; | |
5427 | goto err; | |
5428 | } | |
5429 | ||
5430 | break; | |
5431 | } | |
abcc6153 CC |
5432 | case BINDER_GET_NODE_DEBUG_INFO: { |
5433 | struct binder_node_debug_info info; | |
5434 | ||
5435 | if (copy_from_user(&info, ubuf, sizeof(info))) { | |
5436 | ret = -EFAULT; | |
5437 | goto err; | |
5438 | } | |
5439 | ||
5440 | ret = binder_ioctl_get_node_debug_info(proc, &info); | |
5441 | if (ret < 0) | |
5442 | goto err; | |
5443 | ||
5444 | if (copy_to_user(ubuf, &info, sizeof(info))) { | |
5445 | ret = -EFAULT; | |
5446 | goto err; | |
5447 | } | |
5448 | break; | |
5449 | } | |
432ff1e9 MB |
5450 | case BINDER_FREEZE: { |
5451 | struct binder_freeze_info info; | |
5452 | struct binder_proc **target_procs = NULL, *target_proc; | |
5453 | int target_procs_count = 0, i = 0; | |
5454 | ||
5455 | ret = 0; | |
5456 | ||
5457 | if (copy_from_user(&info, ubuf, sizeof(info))) { | |
5458 | ret = -EFAULT; | |
5459 | goto err; | |
5460 | } | |
5461 | ||
5462 | mutex_lock(&binder_procs_lock); | |
5463 | hlist_for_each_entry(target_proc, &binder_procs, proc_node) { | |
5464 | if (target_proc->pid == info.pid) | |
5465 | target_procs_count++; | |
5466 | } | |
5467 | ||
5468 | if (target_procs_count == 0) { | |
5469 | mutex_unlock(&binder_procs_lock); | |
5470 | ret = -EINVAL; | |
5471 | goto err; | |
5472 | } | |
5473 | ||
5474 | target_procs = kcalloc(target_procs_count, | |
5475 | sizeof(struct binder_proc *), | |
5476 | GFP_KERNEL); | |
5477 | ||
5478 | if (!target_procs) { | |
5479 | mutex_unlock(&binder_procs_lock); | |
5480 | ret = -ENOMEM; | |
5481 | goto err; | |
5482 | } | |
5483 | ||
5484 | hlist_for_each_entry(target_proc, &binder_procs, proc_node) { | |
5485 | if (target_proc->pid != info.pid) | |
5486 | continue; | |
5487 | ||
5488 | binder_inner_proc_lock(target_proc); | |
5489 | target_proc->tmp_ref++; | |
5490 | binder_inner_proc_unlock(target_proc); | |
5491 | ||
5492 | target_procs[i++] = target_proc; | |
5493 | } | |
5494 | mutex_unlock(&binder_procs_lock); | |
5495 | ||
5496 | for (i = 0; i < target_procs_count; i++) { | |
5497 | if (ret >= 0) | |
5498 | ret = binder_ioctl_freeze(&info, | |
5499 | target_procs[i]); | |
5500 | ||
5501 | binder_proc_dec_tmpref(target_procs[i]); | |
5502 | } | |
5503 | ||
5504 | kfree(target_procs); | |
5505 | ||
5506 | if (ret < 0) | |
5507 | goto err; | |
5508 | break; | |
5509 | } | |
ae28c1be MB |
5510 | case BINDER_GET_FROZEN_INFO: { |
5511 | struct binder_frozen_status_info info; | |
5512 | ||
5513 | if (copy_from_user(&info, ubuf, sizeof(info))) { | |
5514 | ret = -EFAULT; | |
5515 | goto err; | |
5516 | } | |
5517 | ||
5518 | ret = binder_ioctl_get_freezer_info(&info); | |
5519 | if (ret < 0) | |
5520 | goto err; | |
5521 | ||
5522 | if (copy_to_user(ubuf, &info, sizeof(info))) { | |
5523 | ret = -EFAULT; | |
5524 | goto err; | |
5525 | } | |
5526 | break; | |
5527 | } | |
a7dc1e6f HL |
5528 | case BINDER_ENABLE_ONEWAY_SPAM_DETECTION: { |
5529 | uint32_t enable; | |
5530 | ||
5531 | if (copy_from_user(&enable, ubuf, sizeof(enable))) { | |
ced081a4 | 5532 | ret = -EFAULT; |
a7dc1e6f HL |
5533 | goto err; |
5534 | } | |
5535 | binder_inner_proc_lock(proc); | |
5536 | proc->oneway_spam_detection_enabled = (bool)enable; | |
5537 | binder_inner_proc_unlock(proc); | |
5538 | break; | |
5539 | } | |
bd32889e CL |
5540 | case BINDER_GET_EXTENDED_ERROR: |
5541 | ret = binder_ioctl_get_extended_error(thread, ubuf); | |
5542 | if (ret < 0) | |
5543 | goto err; | |
5544 | break; | |
355b0502 GKH |
5545 | default: |
5546 | ret = -EINVAL; | |
5547 | goto err; | |
5548 | } | |
5549 | ret = 0; | |
5550 | err: | |
5551 | if (thread) | |
08dabcee | 5552 | thread->looper_need_return = false; |
355b0502 | 5553 | wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2); |
95c16f9d | 5554 | if (ret && ret != -EINTR) |
56b468fc | 5555 | pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret); |
975a1ac9 AH |
5556 | err_unlocked: |
5557 | trace_binder_ioctl_done(ret); | |
355b0502 GKH |
5558 | return ret; |
5559 | } | |
5560 | ||
5561 | static void binder_vma_open(struct vm_area_struct *vma) | |
5562 | { | |
5563 | struct binder_proc *proc = vma->vm_private_data; | |
10f62861 | 5564 | |
355b0502 | 5565 | binder_debug(BINDER_DEBUG_OPEN_CLOSE, |
56b468fc | 5566 | "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n", |
355b0502 GKH |
5567 | proc->pid, vma->vm_start, vma->vm_end, |
5568 | (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, | |
5569 | (unsigned long)pgprot_val(vma->vm_page_prot)); | |
355b0502 GKH |
5570 | } |
5571 | ||
5572 | static void binder_vma_close(struct vm_area_struct *vma) | |
5573 | { | |
5574 | struct binder_proc *proc = vma->vm_private_data; | |
10f62861 | 5575 | |
355b0502 | 5576 | binder_debug(BINDER_DEBUG_OPEN_CLOSE, |
56b468fc | 5577 | "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n", |
355b0502 GKH |
5578 | proc->pid, vma->vm_start, vma->vm_end, |
5579 | (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, | |
5580 | (unsigned long)pgprot_val(vma->vm_page_prot)); | |
19c98724 | 5581 | binder_alloc_vma_close(&proc->alloc); |
355b0502 GKH |
5582 | } |
5583 | ||
e19f70aa | 5584 | static vm_fault_t binder_vm_fault(struct vm_fault *vmf) |
ddac7d5f VM |
5585 | { |
5586 | return VM_FAULT_SIGBUS; | |
5587 | } | |
5588 | ||
7cbea8dc | 5589 | static const struct vm_operations_struct binder_vm_ops = { |
355b0502 GKH |
5590 | .open = binder_vma_open, |
5591 | .close = binder_vma_close, | |
ddac7d5f | 5592 | .fault = binder_vm_fault, |
355b0502 GKH |
5593 | }; |
5594 | ||
19c98724 TK |
5595 | static int binder_mmap(struct file *filp, struct vm_area_struct *vma) |
5596 | { | |
19c98724 | 5597 | struct binder_proc *proc = filp->private_data; |
19c98724 TK |
5598 | |
5599 | if (proc->tsk != current->group_leader) | |
5600 | return -EINVAL; | |
5601 | ||
19c98724 TK |
5602 | binder_debug(BINDER_DEBUG_OPEN_CLOSE, |
5603 | "%s: %d %lx-%lx (%ld K) vma %lx pagep %lx\n", | |
5604 | __func__, proc->pid, vma->vm_start, vma->vm_end, | |
5605 | (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, | |
5606 | (unsigned long)pgprot_val(vma->vm_page_prot)); | |
5607 | ||
5608 | if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) { | |
2a3809da LS |
5609 | pr_err("%s: %d %lx-%lx %s failed %d\n", __func__, |
5610 | proc->pid, vma->vm_start, vma->vm_end, "bad vm_flags", -EPERM); | |
5611 | return -EPERM; | |
19c98724 | 5612 | } |
1c71222e | 5613 | vm_flags_mod(vma, VM_DONTCOPY | VM_MIXEDMAP, VM_MAYWRITE); |
720c2419 | 5614 | |
19c98724 TK |
5615 | vma->vm_ops = &binder_vm_ops; |
5616 | vma->vm_private_data = proc; | |
5617 | ||
2a3809da | 5618 | return binder_alloc_mmap_handler(&proc->alloc, vma); |
355b0502 GKH |
5619 | } |
5620 | ||
5621 | static int binder_open(struct inode *nodp, struct file *filp) | |
5622 | { | |
eb143f87 | 5623 | struct binder_proc *proc, *itr; |
ac4812c5 | 5624 | struct binder_device *binder_dev; |
4feb80fa HV |
5625 | struct binderfs_info *info; |
5626 | struct dentry *binder_binderfs_dir_entry_proc = NULL; | |
eb143f87 | 5627 | bool existing_pid = false; |
355b0502 | 5628 | |
00c41cdd | 5629 | binder_debug(BINDER_DEBUG_OPEN_CLOSE, "%s: %d:%d\n", __func__, |
355b0502 GKH |
5630 | current->group_leader->pid, current->pid); |
5631 | ||
5632 | proc = kzalloc(sizeof(*proc), GFP_KERNEL); | |
5633 | if (proc == NULL) | |
5634 | return -ENOMEM; | |
9630fe88 TK |
5635 | spin_lock_init(&proc->inner_lock); |
5636 | spin_lock_init(&proc->outer_lock); | |
c4ea41ba TK |
5637 | get_task_struct(current->group_leader); |
5638 | proc->tsk = current->group_leader; | |
29bc22ac | 5639 | proc->cred = get_cred(filp->f_cred); |
355b0502 | 5640 | INIT_LIST_HEAD(&proc->todo); |
432ff1e9 | 5641 | init_waitqueue_head(&proc->freeze_wait); |
355b0502 | 5642 | proc->default_priority = task_nice(current); |
3ad20fe3 | 5643 | /* binderfs stashes devices in i_private */ |
4feb80fa | 5644 | if (is_binderfs_device(nodp)) { |
f0fe2c0f | 5645 | binder_dev = nodp->i_private; |
4feb80fa HV |
5646 | info = nodp->i_sb->s_fs_info; |
5647 | binder_binderfs_dir_entry_proc = info->proc_log_dir; | |
5648 | } else { | |
3ad20fe3 CB |
5649 | binder_dev = container_of(filp->private_data, |
5650 | struct binder_device, miscdev); | |
4feb80fa | 5651 | } |
f0fe2c0f | 5652 | refcount_inc(&binder_dev->ref); |
ac4812c5 | 5653 | proc->context = &binder_dev->context; |
19c98724 | 5654 | binder_alloc_init(&proc->alloc); |
975a1ac9 | 5655 | |
355b0502 | 5656 | binder_stats_created(BINDER_STAT_PROC); |
355b0502 GKH |
5657 | proc->pid = current->group_leader->pid; |
5658 | INIT_LIST_HEAD(&proc->delivered_death); | |
1b77e9dc | 5659 | INIT_LIST_HEAD(&proc->waiting_threads); |
355b0502 | 5660 | filp->private_data = proc; |
975a1ac9 | 5661 | |
c44b1231 | 5662 | mutex_lock(&binder_procs_lock); |
eb143f87 MF |
5663 | hlist_for_each_entry(itr, &binder_procs, proc_node) { |
5664 | if (itr->pid == proc->pid) { | |
5665 | existing_pid = true; | |
5666 | break; | |
5667 | } | |
5668 | } | |
c44b1231 TK |
5669 | hlist_add_head(&proc->proc_node, &binder_procs); |
5670 | mutex_unlock(&binder_procs_lock); | |
5671 | ||
eb143f87 | 5672 | if (binder_debugfs_dir_entry_proc && !existing_pid) { |
355b0502 | 5673 | char strbuf[11]; |
10f62861 | 5674 | |
355b0502 | 5675 | snprintf(strbuf, sizeof(strbuf), "%u", proc->pid); |
14db3181 | 5676 | /* |
eb143f87 MF |
5677 | * proc debug entries are shared between contexts. |
5678 | * Only create for the first PID to avoid debugfs log spamming | |
5679 | * The printing code will anyway print all contexts for a given | |
5680 | * PID so this is not a problem. | |
14db3181 | 5681 | */ |
21d02ddf | 5682 | proc->debugfs_entry = debugfs_create_file(strbuf, 0444, |
14db3181 MC |
5683 | binder_debugfs_dir_entry_proc, |
5684 | (void *)(unsigned long)proc->pid, | |
c13e0a52 | 5685 | &proc_fops); |
355b0502 GKH |
5686 | } |
5687 | ||
eb143f87 | 5688 | if (binder_binderfs_dir_entry_proc && !existing_pid) { |
4feb80fa HV |
5689 | char strbuf[11]; |
5690 | struct dentry *binderfs_entry; | |
5691 | ||
5692 | snprintf(strbuf, sizeof(strbuf), "%u", proc->pid); | |
5693 | /* | |
5694 | * Similar to debugfs, the process specific log file is shared | |
eb143f87 MF |
5695 | * between contexts. Only create for the first PID. |
5696 | * This is ok since same as debugfs, the log file will contain | |
5697 | * information on all contexts of a given PID. | |
4feb80fa HV |
5698 | */ |
5699 | binderfs_entry = binderfs_create_file(binder_binderfs_dir_entry_proc, | |
5700 | strbuf, &proc_fops, (void *)(unsigned long)proc->pid); | |
5701 | if (!IS_ERR(binderfs_entry)) { | |
5702 | proc->binderfs_entry = binderfs_entry; | |
5703 | } else { | |
5704 | int error; | |
5705 | ||
5706 | error = PTR_ERR(binderfs_entry); | |
eb143f87 MF |
5707 | pr_warn("Unable to create file %s in binderfs (error %d)\n", |
5708 | strbuf, error); | |
4feb80fa HV |
5709 | } |
5710 | } | |
5711 | ||
355b0502 GKH |
5712 | return 0; |
5713 | } | |
5714 | ||
5715 | static int binder_flush(struct file *filp, fl_owner_t id) | |
5716 | { | |
5717 | struct binder_proc *proc = filp->private_data; | |
5718 | ||
5719 | binder_defer_work(proc, BINDER_DEFERRED_FLUSH); | |
5720 | ||
5721 | return 0; | |
5722 | } | |
5723 | ||
5724 | static void binder_deferred_flush(struct binder_proc *proc) | |
5725 | { | |
5726 | struct rb_node *n; | |
5727 | int wake_count = 0; | |
10f62861 | 5728 | |
7bd7b0e6 | 5729 | binder_inner_proc_lock(proc); |
355b0502 GKH |
5730 | for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) { |
5731 | struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node); | |
10f62861 | 5732 | |
08dabcee | 5733 | thread->looper_need_return = true; |
355b0502 GKH |
5734 | if (thread->looper & BINDER_LOOPER_STATE_WAITING) { |
5735 | wake_up_interruptible(&thread->wait); | |
5736 | wake_count++; | |
5737 | } | |
5738 | } | |
7bd7b0e6 | 5739 | binder_inner_proc_unlock(proc); |
355b0502 GKH |
5740 | |
5741 | binder_debug(BINDER_DEBUG_OPEN_CLOSE, | |
5742 | "binder_flush: %d woke %d threads\n", proc->pid, | |
5743 | wake_count); | |
5744 | } | |
5745 | ||
5746 | static int binder_release(struct inode *nodp, struct file *filp) | |
5747 | { | |
5748 | struct binder_proc *proc = filp->private_data; | |
10f62861 | 5749 | |
16b66554 | 5750 | debugfs_remove(proc->debugfs_entry); |
4feb80fa HV |
5751 | |
5752 | if (proc->binderfs_entry) { | |
5753 | binderfs_remove_file(proc->binderfs_entry); | |
5754 | proc->binderfs_entry = NULL; | |
5755 | } | |
5756 | ||
355b0502 GKH |
5757 | binder_defer_work(proc, BINDER_DEFERRED_RELEASE); |
5758 | ||
5759 | return 0; | |
5760 | } | |
5761 | ||
008fa749 ME |
5762 | static int binder_node_release(struct binder_node *node, int refs) |
5763 | { | |
5764 | struct binder_ref *ref; | |
5765 | int death = 0; | |
ed29721e | 5766 | struct binder_proc *proc = node->proc; |
008fa749 | 5767 | |
72196393 | 5768 | binder_release_work(proc, &node->async_todo); |
ed29721e | 5769 | |
673068ee | 5770 | binder_node_lock(node); |
ed29721e | 5771 | binder_inner_proc_lock(proc); |
72196393 | 5772 | binder_dequeue_work_ilocked(&node->work); |
adc18842 TK |
5773 | /* |
5774 | * The caller must have taken a temporary ref on the node, | |
5775 | */ | |
5776 | BUG_ON(!node->tmp_refs); | |
5777 | if (hlist_empty(&node->refs) && node->tmp_refs == 1) { | |
ed29721e | 5778 | binder_inner_proc_unlock(proc); |
673068ee | 5779 | binder_node_unlock(node); |
ed29721e | 5780 | binder_free_node(node); |
008fa749 ME |
5781 | |
5782 | return refs; | |
5783 | } | |
5784 | ||
5785 | node->proc = NULL; | |
5786 | node->local_strong_refs = 0; | |
5787 | node->local_weak_refs = 0; | |
ed29721e | 5788 | binder_inner_proc_unlock(proc); |
c44b1231 TK |
5789 | |
5790 | spin_lock(&binder_dead_nodes_lock); | |
008fa749 | 5791 | hlist_add_head(&node->dead_node, &binder_dead_nodes); |
c44b1231 | 5792 | spin_unlock(&binder_dead_nodes_lock); |
008fa749 ME |
5793 | |
5794 | hlist_for_each_entry(ref, &node->refs, node_entry) { | |
5795 | refs++; | |
ab51ec6b MC |
5796 | /* |
5797 | * Need the node lock to synchronize | |
5798 | * with new notification requests and the | |
5799 | * inner lock to synchronize with queued | |
5800 | * death notifications. | |
5801 | */ | |
5802 | binder_inner_proc_lock(ref->proc); | |
5803 | if (!ref->death) { | |
5804 | binder_inner_proc_unlock(ref->proc); | |
e194fd8a | 5805 | continue; |
ab51ec6b | 5806 | } |
008fa749 ME |
5807 | |
5808 | death++; | |
5809 | ||
ab51ec6b MC |
5810 | BUG_ON(!list_empty(&ref->death->work.entry)); |
5811 | ref->death->work.type = BINDER_WORK_DEAD_BINDER; | |
5812 | binder_enqueue_work_ilocked(&ref->death->work, | |
5813 | &ref->proc->todo); | |
408c68b1 | 5814 | binder_wakeup_proc_ilocked(ref->proc); |
72196393 | 5815 | binder_inner_proc_unlock(ref->proc); |
008fa749 ME |
5816 | } |
5817 | ||
008fa749 ME |
5818 | binder_debug(BINDER_DEBUG_DEAD_BINDER, |
5819 | "node %d now dead, refs %d, death %d\n", | |
5820 | node->debug_id, refs, death); | |
673068ee | 5821 | binder_node_unlock(node); |
adc18842 | 5822 | binder_put_node(node); |
008fa749 ME |
5823 | |
5824 | return refs; | |
5825 | } | |
5826 | ||
355b0502 GKH |
5827 | static void binder_deferred_release(struct binder_proc *proc) |
5828 | { | |
342e5c90 | 5829 | struct binder_context *context = proc->context; |
355b0502 | 5830 | struct rb_node *n; |
19c98724 | 5831 | int threads, nodes, incoming_refs, outgoing_refs, active_transactions; |
355b0502 | 5832 | |
c44b1231 | 5833 | mutex_lock(&binder_procs_lock); |
355b0502 | 5834 | hlist_del(&proc->proc_node); |
c44b1231 | 5835 | mutex_unlock(&binder_procs_lock); |
53413e7d | 5836 | |
c44b1231 | 5837 | mutex_lock(&context->context_mgr_node_lock); |
342e5c90 MC |
5838 | if (context->binder_context_mgr_node && |
5839 | context->binder_context_mgr_node->proc == proc) { | |
355b0502 | 5840 | binder_debug(BINDER_DEBUG_DEAD_BINDER, |
c07c933f ME |
5841 | "%s: %d context_mgr_node gone\n", |
5842 | __func__, proc->pid); | |
342e5c90 | 5843 | context->binder_context_mgr_node = NULL; |
355b0502 | 5844 | } |
c44b1231 | 5845 | mutex_unlock(&context->context_mgr_node_lock); |
7bd7b0e6 | 5846 | binder_inner_proc_lock(proc); |
7a4408c6 TK |
5847 | /* |
5848 | * Make sure proc stays alive after we | |
5849 | * remove all the threads | |
5850 | */ | |
5851 | proc->tmp_ref++; | |
355b0502 | 5852 | |
7a4408c6 | 5853 | proc->is_dead = true; |
432ff1e9 | 5854 | proc->is_frozen = false; |
ae28c1be MB |
5855 | proc->sync_recv = false; |
5856 | proc->async_recv = false; | |
355b0502 GKH |
5857 | threads = 0; |
5858 | active_transactions = 0; | |
5859 | while ((n = rb_first(&proc->threads))) { | |
53413e7d ME |
5860 | struct binder_thread *thread; |
5861 | ||
5862 | thread = rb_entry(n, struct binder_thread, rb_node); | |
7bd7b0e6 | 5863 | binder_inner_proc_unlock(proc); |
355b0502 | 5864 | threads++; |
7a4408c6 | 5865 | active_transactions += binder_thread_release(proc, thread); |
7bd7b0e6 | 5866 | binder_inner_proc_lock(proc); |
355b0502 | 5867 | } |
53413e7d | 5868 | |
355b0502 GKH |
5869 | nodes = 0; |
5870 | incoming_refs = 0; | |
5871 | while ((n = rb_first(&proc->nodes))) { | |
53413e7d | 5872 | struct binder_node *node; |
355b0502 | 5873 | |
53413e7d | 5874 | node = rb_entry(n, struct binder_node, rb_node); |
355b0502 | 5875 | nodes++; |
adc18842 TK |
5876 | /* |
5877 | * take a temporary ref on the node before | |
5878 | * calling binder_node_release() which will either | |
5879 | * kfree() the node or call binder_put_node() | |
5880 | */ | |
da0fa9e4 | 5881 | binder_inc_node_tmpref_ilocked(node); |
355b0502 | 5882 | rb_erase(&node->rb_node, &proc->nodes); |
da0fa9e4 | 5883 | binder_inner_proc_unlock(proc); |
008fa749 | 5884 | incoming_refs = binder_node_release(node, incoming_refs); |
da0fa9e4 | 5885 | binder_inner_proc_lock(proc); |
355b0502 | 5886 | } |
da0fa9e4 | 5887 | binder_inner_proc_unlock(proc); |
53413e7d | 5888 | |
355b0502 | 5889 | outgoing_refs = 0; |
2c1838dc | 5890 | binder_proc_lock(proc); |
355b0502 | 5891 | while ((n = rb_first(&proc->refs_by_desc))) { |
53413e7d ME |
5892 | struct binder_ref *ref; |
5893 | ||
5894 | ref = rb_entry(n, struct binder_ref, rb_node_desc); | |
355b0502 | 5895 | outgoing_refs++; |
2c1838dc TK |
5896 | binder_cleanup_ref_olocked(ref); |
5897 | binder_proc_unlock(proc); | |
372e3147 | 5898 | binder_free_ref(ref); |
2c1838dc | 5899 | binder_proc_lock(proc); |
355b0502 | 5900 | } |
2c1838dc | 5901 | binder_proc_unlock(proc); |
53413e7d | 5902 | |
72196393 TK |
5903 | binder_release_work(proc, &proc->todo); |
5904 | binder_release_work(proc, &proc->delivered_death); | |
355b0502 | 5905 | |
355b0502 | 5906 | binder_debug(BINDER_DEBUG_OPEN_CLOSE, |
19c98724 | 5907 | "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d\n", |
c07c933f | 5908 | __func__, proc->pid, threads, nodes, incoming_refs, |
19c98724 | 5909 | outgoing_refs, active_transactions); |
355b0502 | 5910 | |
7a4408c6 | 5911 | binder_proc_dec_tmpref(proc); |
355b0502 GKH |
5912 | } |
5913 | ||
5914 | static void binder_deferred_func(struct work_struct *work) | |
5915 | { | |
5916 | struct binder_proc *proc; | |
355b0502 GKH |
5917 | |
5918 | int defer; | |
10f62861 | 5919 | |
355b0502 | 5920 | do { |
355b0502 GKH |
5921 | mutex_lock(&binder_deferred_lock); |
5922 | if (!hlist_empty(&binder_deferred_list)) { | |
5923 | proc = hlist_entry(binder_deferred_list.first, | |
5924 | struct binder_proc, deferred_work_node); | |
5925 | hlist_del_init(&proc->deferred_work_node); | |
5926 | defer = proc->deferred_work; | |
5927 | proc->deferred_work = 0; | |
5928 | } else { | |
5929 | proc = NULL; | |
5930 | defer = 0; | |
5931 | } | |
5932 | mutex_unlock(&binder_deferred_lock); | |
5933 | ||
355b0502 GKH |
5934 | if (defer & BINDER_DEFERRED_FLUSH) |
5935 | binder_deferred_flush(proc); | |
5936 | ||
5937 | if (defer & BINDER_DEFERRED_RELEASE) | |
5938 | binder_deferred_release(proc); /* frees proc */ | |
355b0502 GKH |
5939 | } while (proc); |
5940 | } | |
5941 | static DECLARE_WORK(binder_deferred_work, binder_deferred_func); | |
5942 | ||
5943 | static void | |
5944 | binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer) | |
5945 | { | |
5946 | mutex_lock(&binder_deferred_lock); | |
5947 | proc->deferred_work |= defer; | |
5948 | if (hlist_unhashed(&proc->deferred_work_node)) { | |
5949 | hlist_add_head(&proc->deferred_work_node, | |
5950 | &binder_deferred_list); | |
1beba52d | 5951 | schedule_work(&binder_deferred_work); |
355b0502 GKH |
5952 | } |
5953 | mutex_unlock(&binder_deferred_lock); | |
5954 | } | |
5955 | ||
5f2f6369 TK |
5956 | static void print_binder_transaction_ilocked(struct seq_file *m, |
5957 | struct binder_proc *proc, | |
5958 | const char *prefix, | |
5959 | struct binder_transaction *t) | |
5249f488 | 5960 | { |
5f2f6369 TK |
5961 | struct binder_proc *to_proc; |
5962 | struct binder_buffer *buffer = t->buffer; | |
80093619 | 5963 | ktime_t current_time = ktime_get(); |
5f2f6369 | 5964 | |
7a4408c6 | 5965 | spin_lock(&t->lock); |
5f2f6369 | 5966 | to_proc = t->to_proc; |
5249f488 | 5967 | seq_printf(m, |
80093619 | 5968 | "%s %d: %pK from %d:%d to %d:%d code %x flags %x pri %ld r%d elapsed %lldms", |
5249f488 | 5969 | prefix, t->debug_id, t, |
c21c0f9a CZ |
5970 | t->from_pid, |
5971 | t->from_tid, | |
5f2f6369 | 5972 | to_proc ? to_proc->pid : 0, |
5249f488 | 5973 | t->to_thread ? t->to_thread->pid : 0, |
80093619 CZ |
5974 | t->code, t->flags, t->priority, t->need_reply, |
5975 | ktime_ms_delta(current_time, t->start_time)); | |
7a4408c6 TK |
5976 | spin_unlock(&t->lock); |
5977 | ||
5f2f6369 TK |
5978 | if (proc != to_proc) { |
5979 | /* | |
5980 | * Can only safely deref buffer if we are holding the | |
5981 | * correct proc inner lock for this node | |
5982 | */ | |
5983 | seq_puts(m, "\n"); | |
5984 | return; | |
5985 | } | |
5986 | ||
5987 | if (buffer == NULL) { | |
5249f488 AH |
5988 | seq_puts(m, " buffer free\n"); |
5989 | return; | |
355b0502 | 5990 | } |
5f2f6369 TK |
5991 | if (buffer->target_node) |
5992 | seq_printf(m, " node %d", buffer->target_node->debug_id); | |
162c7973 | 5993 | seq_printf(m, " size %zd:%zd offset %lx\n", |
5f2f6369 | 5994 | buffer->data_size, buffer->offsets_size, |
162c7973 | 5995 | proc->alloc.buffer - buffer->user_data); |
355b0502 GKH |
5996 | } |
5997 | ||
5f2f6369 TK |
5998 | static void print_binder_work_ilocked(struct seq_file *m, |
5999 | struct binder_proc *proc, | |
6000 | const char *prefix, | |
6001 | const char *transaction_prefix, | |
6002 | struct binder_work *w) | |
355b0502 GKH |
6003 | { |
6004 | struct binder_node *node; | |
6005 | struct binder_transaction *t; | |
6006 | ||
6007 | switch (w->type) { | |
6008 | case BINDER_WORK_TRANSACTION: | |
6009 | t = container_of(w, struct binder_transaction, work); | |
5f2f6369 TK |
6010 | print_binder_transaction_ilocked( |
6011 | m, proc, transaction_prefix, t); | |
355b0502 | 6012 | break; |
26549d17 TK |
6013 | case BINDER_WORK_RETURN_ERROR: { |
6014 | struct binder_error *e = container_of( | |
6015 | w, struct binder_error, work); | |
6016 | ||
6017 | seq_printf(m, "%stransaction error: %u\n", | |
6018 | prefix, e->cmd); | |
6019 | } break; | |
355b0502 | 6020 | case BINDER_WORK_TRANSACTION_COMPLETE: |
5249f488 | 6021 | seq_printf(m, "%stransaction complete\n", prefix); |
355b0502 GKH |
6022 | break; |
6023 | case BINDER_WORK_NODE: | |
6024 | node = container_of(w, struct binder_node, work); | |
da49889d AH |
6025 | seq_printf(m, "%snode work %d: u%016llx c%016llx\n", |
6026 | prefix, node->debug_id, | |
6027 | (u64)node->ptr, (u64)node->cookie); | |
355b0502 GKH |
6028 | break; |
6029 | case BINDER_WORK_DEAD_BINDER: | |
5249f488 | 6030 | seq_printf(m, "%shas dead binder\n", prefix); |
355b0502 GKH |
6031 | break; |
6032 | case BINDER_WORK_DEAD_BINDER_AND_CLEAR: | |
5249f488 | 6033 | seq_printf(m, "%shas cleared dead binder\n", prefix); |
355b0502 GKH |
6034 | break; |
6035 | case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: | |
5249f488 | 6036 | seq_printf(m, "%shas cleared death notification\n", prefix); |
355b0502 GKH |
6037 | break; |
6038 | default: | |
5249f488 | 6039 | seq_printf(m, "%sunknown work: type %d\n", prefix, w->type); |
355b0502 GKH |
6040 | break; |
6041 | } | |
355b0502 GKH |
6042 | } |
6043 | ||
72196393 TK |
6044 | static void print_binder_thread_ilocked(struct seq_file *m, |
6045 | struct binder_thread *thread, | |
6046 | int print_always) | |
355b0502 GKH |
6047 | { |
6048 | struct binder_transaction *t; | |
6049 | struct binder_work *w; | |
5249f488 AH |
6050 | size_t start_pos = m->count; |
6051 | size_t header_pos; | |
355b0502 | 6052 | |
7a4408c6 | 6053 | seq_printf(m, " thread %d: l %02x need_return %d tr %d\n", |
08dabcee | 6054 | thread->pid, thread->looper, |
7a4408c6 TK |
6055 | thread->looper_need_return, |
6056 | atomic_read(&thread->tmp_ref)); | |
5249f488 | 6057 | header_pos = m->count; |
355b0502 GKH |
6058 | t = thread->transaction_stack; |
6059 | while (t) { | |
355b0502 | 6060 | if (t->from == thread) { |
5f2f6369 TK |
6061 | print_binder_transaction_ilocked(m, thread->proc, |
6062 | " outgoing transaction", t); | |
355b0502 GKH |
6063 | t = t->from_parent; |
6064 | } else if (t->to_thread == thread) { | |
5f2f6369 | 6065 | print_binder_transaction_ilocked(m, thread->proc, |
5249f488 | 6066 | " incoming transaction", t); |
355b0502 GKH |
6067 | t = t->to_parent; |
6068 | } else { | |
5f2f6369 TK |
6069 | print_binder_transaction_ilocked(m, thread->proc, |
6070 | " bad transaction", t); | |
355b0502 GKH |
6071 | t = NULL; |
6072 | } | |
6073 | } | |
6074 | list_for_each_entry(w, &thread->todo, entry) { | |
5f2f6369 | 6075 | print_binder_work_ilocked(m, thread->proc, " ", |
72196393 | 6076 | " pending transaction", w); |
355b0502 | 6077 | } |
5249f488 AH |
6078 | if (!print_always && m->count == header_pos) |
6079 | m->count = start_pos; | |
355b0502 GKH |
6080 | } |
6081 | ||
da0fa9e4 TK |
6082 | static void print_binder_node_nilocked(struct seq_file *m, |
6083 | struct binder_node *node) | |
355b0502 GKH |
6084 | { |
6085 | struct binder_ref *ref; | |
355b0502 GKH |
6086 | struct binder_work *w; |
6087 | int count; | |
6088 | ||
6089 | count = 0; | |
b67bfe0d | 6090 | hlist_for_each_entry(ref, &node->refs, node_entry) |
355b0502 GKH |
6091 | count++; |
6092 | ||
adc18842 | 6093 | seq_printf(m, " node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d tr %d", |
da49889d | 6094 | node->debug_id, (u64)node->ptr, (u64)node->cookie, |
5249f488 AH |
6095 | node->has_strong_ref, node->has_weak_ref, |
6096 | node->local_strong_refs, node->local_weak_refs, | |
adc18842 | 6097 | node->internal_strong_refs, count, node->tmp_refs); |
355b0502 | 6098 | if (count) { |
5249f488 | 6099 | seq_puts(m, " proc"); |
b67bfe0d | 6100 | hlist_for_each_entry(ref, &node->refs, node_entry) |
5249f488 | 6101 | seq_printf(m, " %d", ref->proc->pid); |
355b0502 | 6102 | } |
5249f488 | 6103 | seq_puts(m, "\n"); |
72196393 | 6104 | if (node->proc) { |
72196393 | 6105 | list_for_each_entry(w, &node->async_todo, entry) |
5f2f6369 | 6106 | print_binder_work_ilocked(m, node->proc, " ", |
72196393 | 6107 | " pending async transaction", w); |
72196393 | 6108 | } |
355b0502 GKH |
6109 | } |
6110 | ||
2c1838dc TK |
6111 | static void print_binder_ref_olocked(struct seq_file *m, |
6112 | struct binder_ref *ref) | |
355b0502 | 6113 | { |
673068ee | 6114 | binder_node_lock(ref->node); |
372e3147 TK |
6115 | seq_printf(m, " ref %d: desc %d %snode %d s %d w %d d %pK\n", |
6116 | ref->data.debug_id, ref->data.desc, | |
6117 | ref->node->proc ? "" : "dead ", | |
6118 | ref->node->debug_id, ref->data.strong, | |
6119 | ref->data.weak, ref->death); | |
673068ee | 6120 | binder_node_unlock(ref->node); |
355b0502 GKH |
6121 | } |
6122 | ||
5249f488 AH |
6123 | static void print_binder_proc(struct seq_file *m, |
6124 | struct binder_proc *proc, int print_all) | |
355b0502 GKH |
6125 | { |
6126 | struct binder_work *w; | |
6127 | struct rb_node *n; | |
5249f488 AH |
6128 | size_t start_pos = m->count; |
6129 | size_t header_pos; | |
da0fa9e4 | 6130 | struct binder_node *last_node = NULL; |
5249f488 AH |
6131 | |
6132 | seq_printf(m, "proc %d\n", proc->pid); | |
14db3181 | 6133 | seq_printf(m, "context %s\n", proc->context->name); |
5249f488 AH |
6134 | header_pos = m->count; |
6135 | ||
72196393 | 6136 | binder_inner_proc_lock(proc); |
5249f488 | 6137 | for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) |
72196393 | 6138 | print_binder_thread_ilocked(m, rb_entry(n, struct binder_thread, |
5249f488 | 6139 | rb_node), print_all); |
da0fa9e4 | 6140 | |
5249f488 | 6141 | for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) { |
355b0502 GKH |
6142 | struct binder_node *node = rb_entry(n, struct binder_node, |
6143 | rb_node); | |
ecd589d8 TK |
6144 | if (!print_all && !node->has_async_transaction) |
6145 | continue; | |
6146 | ||
da0fa9e4 TK |
6147 | /* |
6148 | * take a temporary reference on the node so it | |
6149 | * survives and isn't removed from the tree | |
6150 | * while we print it. | |
6151 | */ | |
6152 | binder_inc_node_tmpref_ilocked(node); | |
6153 | /* Need to drop inner lock to take node lock */ | |
6154 | binder_inner_proc_unlock(proc); | |
6155 | if (last_node) | |
6156 | binder_put_node(last_node); | |
6157 | binder_node_inner_lock(node); | |
6158 | print_binder_node_nilocked(m, node); | |
6159 | binder_node_inner_unlock(node); | |
6160 | last_node = node; | |
6161 | binder_inner_proc_lock(proc); | |
355b0502 | 6162 | } |
da0fa9e4 TK |
6163 | binder_inner_proc_unlock(proc); |
6164 | if (last_node) | |
6165 | binder_put_node(last_node); | |
6166 | ||
355b0502 | 6167 | if (print_all) { |
2c1838dc | 6168 | binder_proc_lock(proc); |
355b0502 | 6169 | for (n = rb_first(&proc->refs_by_desc); |
5249f488 | 6170 | n != NULL; |
355b0502 | 6171 | n = rb_next(n)) |
2c1838dc TK |
6172 | print_binder_ref_olocked(m, rb_entry(n, |
6173 | struct binder_ref, | |
6174 | rb_node_desc)); | |
6175 | binder_proc_unlock(proc); | |
355b0502 | 6176 | } |
19c98724 | 6177 | binder_alloc_print_allocated(m, &proc->alloc); |
72196393 | 6178 | binder_inner_proc_lock(proc); |
5249f488 | 6179 | list_for_each_entry(w, &proc->todo, entry) |
5f2f6369 TK |
6180 | print_binder_work_ilocked(m, proc, " ", |
6181 | " pending transaction", w); | |
355b0502 | 6182 | list_for_each_entry(w, &proc->delivered_death, entry) { |
5249f488 | 6183 | seq_puts(m, " has delivered dead binder\n"); |
355b0502 GKH |
6184 | break; |
6185 | } | |
72196393 | 6186 | binder_inner_proc_unlock(proc); |
5249f488 AH |
6187 | if (!print_all && m->count == header_pos) |
6188 | m->count = start_pos; | |
355b0502 GKH |
6189 | } |
6190 | ||
167bccbd | 6191 | static const char * const binder_return_strings[] = { |
355b0502 GKH |
6192 | "BR_ERROR", |
6193 | "BR_OK", | |
6194 | "BR_TRANSACTION", | |
6195 | "BR_REPLY", | |
6196 | "BR_ACQUIRE_RESULT", | |
6197 | "BR_DEAD_REPLY", | |
6198 | "BR_TRANSACTION_COMPLETE", | |
6199 | "BR_INCREFS", | |
6200 | "BR_ACQUIRE", | |
6201 | "BR_RELEASE", | |
6202 | "BR_DECREFS", | |
6203 | "BR_ATTEMPT_ACQUIRE", | |
6204 | "BR_NOOP", | |
6205 | "BR_SPAWN_LOOPER", | |
6206 | "BR_FINISHED", | |
6207 | "BR_DEAD_BINDER", | |
6208 | "BR_CLEAR_DEATH_NOTIFICATION_DONE", | |
00516915 HL |
6209 | "BR_FAILED_REPLY", |
6210 | "BR_FROZEN_REPLY", | |
a7dc1e6f | 6211 | "BR_ONEWAY_SPAM_SUSPECT", |
0567461a | 6212 | "BR_TRANSACTION_PENDING_FROZEN" |
355b0502 GKH |
6213 | }; |
6214 | ||
167bccbd | 6215 | static const char * const binder_command_strings[] = { |
355b0502 GKH |
6216 | "BC_TRANSACTION", |
6217 | "BC_REPLY", | |
6218 | "BC_ACQUIRE_RESULT", | |
6219 | "BC_FREE_BUFFER", | |
6220 | "BC_INCREFS", | |
6221 | "BC_ACQUIRE", | |
6222 | "BC_RELEASE", | |
6223 | "BC_DECREFS", | |
6224 | "BC_INCREFS_DONE", | |
6225 | "BC_ACQUIRE_DONE", | |
6226 | "BC_ATTEMPT_ACQUIRE", | |
6227 | "BC_REGISTER_LOOPER", | |
6228 | "BC_ENTER_LOOPER", | |
6229 | "BC_EXIT_LOOPER", | |
6230 | "BC_REQUEST_DEATH_NOTIFICATION", | |
6231 | "BC_CLEAR_DEATH_NOTIFICATION", | |
7980240b MC |
6232 | "BC_DEAD_BINDER_DONE", |
6233 | "BC_TRANSACTION_SG", | |
6234 | "BC_REPLY_SG", | |
355b0502 GKH |
6235 | }; |
6236 | ||
167bccbd | 6237 | static const char * const binder_objstat_strings[] = { |
355b0502 GKH |
6238 | "proc", |
6239 | "thread", | |
6240 | "node", | |
6241 | "ref", | |
6242 | "death", | |
6243 | "transaction", | |
6244 | "transaction_complete" | |
6245 | }; | |
6246 | ||
5249f488 AH |
6247 | static void print_binder_stats(struct seq_file *m, const char *prefix, |
6248 | struct binder_stats *stats) | |
355b0502 GKH |
6249 | { |
6250 | int i; | |
6251 | ||
6252 | BUILD_BUG_ON(ARRAY_SIZE(stats->bc) != | |
5249f488 | 6253 | ARRAY_SIZE(binder_command_strings)); |
355b0502 | 6254 | for (i = 0; i < ARRAY_SIZE(stats->bc); i++) { |
0953c797 BJS |
6255 | int temp = atomic_read(&stats->bc[i]); |
6256 | ||
6257 | if (temp) | |
5249f488 | 6258 | seq_printf(m, "%s%s: %d\n", prefix, |
0953c797 | 6259 | binder_command_strings[i], temp); |
355b0502 GKH |
6260 | } |
6261 | ||
6262 | BUILD_BUG_ON(ARRAY_SIZE(stats->br) != | |
5249f488 | 6263 | ARRAY_SIZE(binder_return_strings)); |
355b0502 | 6264 | for (i = 0; i < ARRAY_SIZE(stats->br); i++) { |
0953c797 BJS |
6265 | int temp = atomic_read(&stats->br[i]); |
6266 | ||
6267 | if (temp) | |
5249f488 | 6268 | seq_printf(m, "%s%s: %d\n", prefix, |
0953c797 | 6269 | binder_return_strings[i], temp); |
355b0502 GKH |
6270 | } |
6271 | ||
6272 | BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != | |
5249f488 | 6273 | ARRAY_SIZE(binder_objstat_strings)); |
355b0502 | 6274 | BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != |
5249f488 | 6275 | ARRAY_SIZE(stats->obj_deleted)); |
355b0502 | 6276 | for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) { |
0953c797 BJS |
6277 | int created = atomic_read(&stats->obj_created[i]); |
6278 | int deleted = atomic_read(&stats->obj_deleted[i]); | |
6279 | ||
6280 | if (created || deleted) | |
6281 | seq_printf(m, "%s%s: active %d total %d\n", | |
6282 | prefix, | |
5249f488 | 6283 | binder_objstat_strings[i], |
0953c797 BJS |
6284 | created - deleted, |
6285 | created); | |
355b0502 | 6286 | } |
355b0502 GKH |
6287 | } |
6288 | ||
5249f488 AH |
6289 | static void print_binder_proc_stats(struct seq_file *m, |
6290 | struct binder_proc *proc) | |
355b0502 GKH |
6291 | { |
6292 | struct binder_work *w; | |
1b77e9dc | 6293 | struct binder_thread *thread; |
355b0502 | 6294 | struct rb_node *n; |
1b77e9dc | 6295 | int count, strong, weak, ready_threads; |
7bd7b0e6 TK |
6296 | size_t free_async_space = |
6297 | binder_alloc_get_free_async_space(&proc->alloc); | |
355b0502 | 6298 | |
5249f488 | 6299 | seq_printf(m, "proc %d\n", proc->pid); |
14db3181 | 6300 | seq_printf(m, "context %s\n", proc->context->name); |
355b0502 | 6301 | count = 0; |
1b77e9dc | 6302 | ready_threads = 0; |
7bd7b0e6 | 6303 | binder_inner_proc_lock(proc); |
355b0502 GKH |
6304 | for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) |
6305 | count++; | |
1b77e9dc MC |
6306 | |
6307 | list_for_each_entry(thread, &proc->waiting_threads, waiting_thread_node) | |
6308 | ready_threads++; | |
6309 | ||
5249f488 AH |
6310 | seq_printf(m, " threads: %d\n", count); |
6311 | seq_printf(m, " requested threads: %d+%d/%d\n" | |
355b0502 GKH |
6312 | " ready threads %d\n" |
6313 | " free async space %zd\n", proc->requested_threads, | |
6314 | proc->requested_threads_started, proc->max_threads, | |
1b77e9dc | 6315 | ready_threads, |
7bd7b0e6 | 6316 | free_async_space); |
355b0502 GKH |
6317 | count = 0; |
6318 | for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) | |
6319 | count++; | |
da0fa9e4 | 6320 | binder_inner_proc_unlock(proc); |
5249f488 | 6321 | seq_printf(m, " nodes: %d\n", count); |
355b0502 GKH |
6322 | count = 0; |
6323 | strong = 0; | |
6324 | weak = 0; | |
2c1838dc | 6325 | binder_proc_lock(proc); |
355b0502 GKH |
6326 | for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) { |
6327 | struct binder_ref *ref = rb_entry(n, struct binder_ref, | |
6328 | rb_node_desc); | |
6329 | count++; | |
372e3147 TK |
6330 | strong += ref->data.strong; |
6331 | weak += ref->data.weak; | |
355b0502 | 6332 | } |
2c1838dc | 6333 | binder_proc_unlock(proc); |
5249f488 | 6334 | seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak); |
355b0502 | 6335 | |
19c98724 | 6336 | count = binder_alloc_get_allocated_count(&proc->alloc); |
5249f488 | 6337 | seq_printf(m, " buffers: %d\n", count); |
355b0502 | 6338 | |
8ef4665a SY |
6339 | binder_alloc_print_pages(m, &proc->alloc); |
6340 | ||
355b0502 | 6341 | count = 0; |
72196393 | 6342 | binder_inner_proc_lock(proc); |
355b0502 | 6343 | list_for_each_entry(w, &proc->todo, entry) { |
72196393 | 6344 | if (w->type == BINDER_WORK_TRANSACTION) |
355b0502 | 6345 | count++; |
355b0502 | 6346 | } |
72196393 | 6347 | binder_inner_proc_unlock(proc); |
5249f488 | 6348 | seq_printf(m, " pending transactions: %d\n", count); |
355b0502 | 6349 | |
5249f488 | 6350 | print_binder_stats(m, " ", &proc->stats); |
355b0502 GKH |
6351 | } |
6352 | ||
b7e241bb | 6353 | static int state_show(struct seq_file *m, void *unused) |
355b0502 GKH |
6354 | { |
6355 | struct binder_proc *proc; | |
355b0502 | 6356 | struct binder_node *node; |
673068ee | 6357 | struct binder_node *last_node = NULL; |
355b0502 | 6358 | |
5249f488 | 6359 | seq_puts(m, "binder state:\n"); |
355b0502 | 6360 | |
c44b1231 | 6361 | spin_lock(&binder_dead_nodes_lock); |
355b0502 | 6362 | if (!hlist_empty(&binder_dead_nodes)) |
5249f488 | 6363 | seq_puts(m, "dead nodes:\n"); |
673068ee TK |
6364 | hlist_for_each_entry(node, &binder_dead_nodes, dead_node) { |
6365 | /* | |
6366 | * take a temporary reference on the node so it | |
6367 | * survives and isn't removed from the list | |
6368 | * while we print it. | |
6369 | */ | |
6370 | node->tmp_refs++; | |
6371 | spin_unlock(&binder_dead_nodes_lock); | |
6372 | if (last_node) | |
6373 | binder_put_node(last_node); | |
6374 | binder_node_lock(node); | |
da0fa9e4 | 6375 | print_binder_node_nilocked(m, node); |
673068ee TK |
6376 | binder_node_unlock(node); |
6377 | last_node = node; | |
6378 | spin_lock(&binder_dead_nodes_lock); | |
6379 | } | |
c44b1231 | 6380 | spin_unlock(&binder_dead_nodes_lock); |
673068ee TK |
6381 | if (last_node) |
6382 | binder_put_node(last_node); | |
355b0502 | 6383 | |
c44b1231 | 6384 | mutex_lock(&binder_procs_lock); |
b67bfe0d | 6385 | hlist_for_each_entry(proc, &binder_procs, proc_node) |
5249f488 | 6386 | print_binder_proc(m, proc, 1); |
c44b1231 | 6387 | mutex_unlock(&binder_procs_lock); |
a60b890f | 6388 | |
5249f488 | 6389 | return 0; |
355b0502 GKH |
6390 | } |
6391 | ||
b7e241bb | 6392 | static int stats_show(struct seq_file *m, void *unused) |
355b0502 GKH |
6393 | { |
6394 | struct binder_proc *proc; | |
355b0502 | 6395 | |
5249f488 | 6396 | seq_puts(m, "binder stats:\n"); |
355b0502 | 6397 | |
5249f488 | 6398 | print_binder_stats(m, "", &binder_stats); |
355b0502 | 6399 | |
c44b1231 | 6400 | mutex_lock(&binder_procs_lock); |
b67bfe0d | 6401 | hlist_for_each_entry(proc, &binder_procs, proc_node) |
5249f488 | 6402 | print_binder_proc_stats(m, proc); |
c44b1231 | 6403 | mutex_unlock(&binder_procs_lock); |
a60b890f | 6404 | |
5249f488 | 6405 | return 0; |
355b0502 GKH |
6406 | } |
6407 | ||
b7e241bb | 6408 | static int transactions_show(struct seq_file *m, void *unused) |
355b0502 GKH |
6409 | { |
6410 | struct binder_proc *proc; | |
355b0502 | 6411 | |
5249f488 | 6412 | seq_puts(m, "binder transactions:\n"); |
c44b1231 | 6413 | mutex_lock(&binder_procs_lock); |
b67bfe0d | 6414 | hlist_for_each_entry(proc, &binder_procs, proc_node) |
5249f488 | 6415 | print_binder_proc(m, proc, 0); |
c44b1231 | 6416 | mutex_unlock(&binder_procs_lock); |
a60b890f | 6417 | |
5249f488 | 6418 | return 0; |
355b0502 GKH |
6419 | } |
6420 | ||
c13e0a52 | 6421 | static int proc_show(struct seq_file *m, void *unused) |
355b0502 | 6422 | { |
83050a4e | 6423 | struct binder_proc *itr; |
14db3181 | 6424 | int pid = (unsigned long)m->private; |
355b0502 | 6425 | |
c44b1231 | 6426 | mutex_lock(&binder_procs_lock); |
83050a4e | 6427 | hlist_for_each_entry(itr, &binder_procs, proc_node) { |
14db3181 MC |
6428 | if (itr->pid == pid) { |
6429 | seq_puts(m, "binder proc state:\n"); | |
6430 | print_binder_proc(m, itr, 1); | |
83050a4e RA |
6431 | } |
6432 | } | |
c44b1231 TK |
6433 | mutex_unlock(&binder_procs_lock); |
6434 | ||
5249f488 | 6435 | return 0; |
355b0502 GKH |
6436 | } |
6437 | ||
5249f488 | 6438 | static void print_binder_transaction_log_entry(struct seq_file *m, |
355b0502 GKH |
6439 | struct binder_transaction_log_entry *e) |
6440 | { | |
d99c7333 TK |
6441 | int debug_id = READ_ONCE(e->debug_id_done); |
6442 | /* | |
6443 | * read barrier to guarantee debug_id_done read before | |
6444 | * we print the log values | |
6445 | */ | |
6446 | smp_rmb(); | |
5249f488 | 6447 | seq_printf(m, |
d99c7333 | 6448 | "%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d ret %d/%d l=%d", |
5249f488 AH |
6449 | e->debug_id, (e->call_type == 2) ? "reply" : |
6450 | ((e->call_type == 1) ? "async" : "call "), e->from_proc, | |
14db3181 | 6451 | e->from_thread, e->to_proc, e->to_thread, e->context_name, |
57ada2fb TK |
6452 | e->to_node, e->target_handle, e->data_size, e->offsets_size, |
6453 | e->return_error, e->return_error_param, | |
6454 | e->return_error_line); | |
d99c7333 TK |
6455 | /* |
6456 | * read-barrier to guarantee read of debug_id_done after | |
6457 | * done printing the fields of the entry | |
6458 | */ | |
6459 | smp_rmb(); | |
6460 | seq_printf(m, debug_id && debug_id == READ_ONCE(e->debug_id_done) ? | |
6461 | "\n" : " (incomplete)\n"); | |
355b0502 GKH |
6462 | } |
6463 | ||
b7e241bb | 6464 | static int transaction_log_show(struct seq_file *m, void *unused) |
355b0502 | 6465 | { |
5249f488 | 6466 | struct binder_transaction_log *log = m->private; |
d99c7333 TK |
6467 | unsigned int log_cur = atomic_read(&log->cur); |
6468 | unsigned int count; | |
6469 | unsigned int cur; | |
355b0502 | 6470 | int i; |
355b0502 | 6471 | |
d99c7333 TK |
6472 | count = log_cur + 1; |
6473 | cur = count < ARRAY_SIZE(log->entry) && !log->full ? | |
6474 | 0 : count % ARRAY_SIZE(log->entry); | |
6475 | if (count > ARRAY_SIZE(log->entry) || log->full) | |
6476 | count = ARRAY_SIZE(log->entry); | |
6477 | for (i = 0; i < count; i++) { | |
6478 | unsigned int index = cur++ % ARRAY_SIZE(log->entry); | |
6479 | ||
6480 | print_binder_transaction_log_entry(m, &log->entry[index]); | |
355b0502 | 6481 | } |
5249f488 | 6482 | return 0; |
355b0502 GKH |
6483 | } |
6484 | ||
3ad20fe3 | 6485 | const struct file_operations binder_fops = { |
355b0502 GKH |
6486 | .owner = THIS_MODULE, |
6487 | .poll = binder_poll, | |
6488 | .unlocked_ioctl = binder_ioctl, | |
1832f2d8 | 6489 | .compat_ioctl = compat_ptr_ioctl, |
355b0502 GKH |
6490 | .mmap = binder_mmap, |
6491 | .open = binder_open, | |
6492 | .flush = binder_flush, | |
6493 | .release = binder_release, | |
6494 | }; | |
6495 | ||
b7e241bb CL |
6496 | DEFINE_SHOW_ATTRIBUTE(state); |
6497 | DEFINE_SHOW_ATTRIBUTE(stats); | |
6498 | DEFINE_SHOW_ATTRIBUTE(transactions); | |
6499 | DEFINE_SHOW_ATTRIBUTE(transaction_log); | |
6500 | ||
6501 | const struct binder_debugfs_entry binder_debugfs_entries[] = { | |
6502 | { | |
6503 | .name = "state", | |
6504 | .mode = 0444, | |
6505 | .fops = &state_fops, | |
6506 | .data = NULL, | |
6507 | }, | |
6508 | { | |
6509 | .name = "stats", | |
6510 | .mode = 0444, | |
6511 | .fops = &stats_fops, | |
6512 | .data = NULL, | |
6513 | }, | |
6514 | { | |
6515 | .name = "transactions", | |
6516 | .mode = 0444, | |
6517 | .fops = &transactions_fops, | |
6518 | .data = NULL, | |
6519 | }, | |
6520 | { | |
6521 | .name = "transaction_log", | |
6522 | .mode = 0444, | |
6523 | .fops = &transaction_log_fops, | |
6524 | .data = &binder_transaction_log, | |
6525 | }, | |
6526 | { | |
6527 | .name = "failed_transaction_log", | |
6528 | .mode = 0444, | |
6529 | .fops = &transaction_log_fops, | |
6530 | .data = &binder_transaction_log_failed, | |
6531 | }, | |
6532 | {} /* terminator */ | |
6533 | }; | |
6534 | ||
ac4812c5 MC |
6535 | static int __init init_binder_device(const char *name) |
6536 | { | |
6537 | int ret; | |
6538 | struct binder_device *binder_device; | |
6539 | ||
6540 | binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL); | |
6541 | if (!binder_device) | |
6542 | return -ENOMEM; | |
6543 | ||
6544 | binder_device->miscdev.fops = &binder_fops; | |
6545 | binder_device->miscdev.minor = MISC_DYNAMIC_MINOR; | |
6546 | binder_device->miscdev.name = name; | |
6547 | ||
f0fe2c0f | 6548 | refcount_set(&binder_device->ref, 1); |
ac4812c5 MC |
6549 | binder_device->context.binder_context_mgr_uid = INVALID_UID; |
6550 | binder_device->context.name = name; | |
c44b1231 | 6551 | mutex_init(&binder_device->context.context_mgr_node_lock); |
ac4812c5 MC |
6552 | |
6553 | ret = misc_register(&binder_device->miscdev); | |
6554 | if (ret < 0) { | |
6555 | kfree(binder_device); | |
6556 | return ret; | |
6557 | } | |
6558 | ||
6559 | hlist_add_head(&binder_device->hlist, &binder_devices); | |
6560 | ||
6561 | return ret; | |
6562 | } | |
6563 | ||
355b0502 GKH |
6564 | static int __init binder_init(void) |
6565 | { | |
6566 | int ret; | |
5b9633af | 6567 | char *device_name, *device_tmp; |
ac4812c5 MC |
6568 | struct binder_device *device; |
6569 | struct hlist_node *tmp; | |
5b9633af | 6570 | char *device_names = NULL; |
51b080a4 | 6571 | const struct binder_debugfs_entry *db_entry; |
355b0502 | 6572 | |
533dfb25 TH |
6573 | ret = binder_alloc_shrinker_init(); |
6574 | if (ret) | |
6575 | return ret; | |
f2517eb7 | 6576 | |
d99c7333 TK |
6577 | atomic_set(&binder_transaction_log.cur, ~0U); |
6578 | atomic_set(&binder_transaction_log_failed.cur, ~0U); | |
6579 | ||
16b66554 | 6580 | binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL); |
b7e241bb | 6581 | |
51b080a4 WM |
6582 | binder_for_each_debugfs_entry(db_entry) |
6583 | debugfs_create_file(db_entry->name, | |
6584 | db_entry->mode, | |
6585 | binder_debugfs_dir_entry_root, | |
6586 | db_entry->data, | |
6587 | db_entry->fops); | |
b7e241bb | 6588 | |
51b080a4 WM |
6589 | binder_debugfs_dir_entry_proc = debugfs_create_dir("proc", |
6590 | binder_debugfs_dir_entry_root); | |
ac4812c5 | 6591 | |
ca2864c6 HV |
6592 | if (!IS_ENABLED(CONFIG_ANDROID_BINDERFS) && |
6593 | strcmp(binder_devices_param, "") != 0) { | |
793c8232 CB |
6594 | /* |
6595 | * Copy the module_parameter string, because we don't want to | |
6596 | * tokenize it in-place. | |
6597 | */ | |
6598 | device_names = kstrdup(binder_devices_param, GFP_KERNEL); | |
6599 | if (!device_names) { | |
6600 | ret = -ENOMEM; | |
6601 | goto err_alloc_device_names_failed; | |
6602 | } | |
ac4812c5 | 6603 | |
793c8232 CB |
6604 | device_tmp = device_names; |
6605 | while ((device_name = strsep(&device_tmp, ","))) { | |
6606 | ret = init_binder_device(device_name); | |
6607 | if (ret) | |
6608 | goto err_init_binder_device_failed; | |
6609 | } | |
ac4812c5 MC |
6610 | } |
6611 | ||
5b9633af CB |
6612 | ret = init_binderfs(); |
6613 | if (ret) | |
6614 | goto err_init_binder_device_failed; | |
6615 | ||
ac4812c5 MC |
6616 | return ret; |
6617 | ||
6618 | err_init_binder_device_failed: | |
6619 | hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) { | |
6620 | misc_deregister(&device->miscdev); | |
6621 | hlist_del(&device->hlist); | |
6622 | kfree(device); | |
6623 | } | |
22eb9476 CB |
6624 | |
6625 | kfree(device_names); | |
6626 | ||
ac4812c5 MC |
6627 | err_alloc_device_names_failed: |
6628 | debugfs_remove_recursive(binder_debugfs_dir_entry_root); | |
adb9743d | 6629 | binder_alloc_shrinker_exit(); |
ac4812c5 | 6630 | |
355b0502 GKH |
6631 | return ret; |
6632 | } | |
6633 | ||
6634 | device_initcall(binder_init); | |
6635 | ||
975a1ac9 AH |
6636 | #define CREATE_TRACE_POINTS |
6637 | #include "binder_trace.h" | |
6638 | ||
355b0502 | 6639 | MODULE_LICENSE("GPL v2"); |