Commit | Line | Data |
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bcea3f96 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f3f096cf SD |
2 | /* |
3 | * uprobes-based tracing events | |
4 | * | |
f3f096cf SD |
5 | * Copyright (C) IBM Corporation, 2010-2012 |
6 | * Author: Srikar Dronamraju <srikar@linux.vnet.ibm.com> | |
7 | */ | |
ea6eb5e7 | 8 | #define pr_fmt(fmt) "trace_uprobe: " fmt |
f3f096cf | 9 | |
aef2feda | 10 | #include <linux/bpf-cgroup.h> |
17911ff3 | 11 | #include <linux/security.h> |
0597c49c | 12 | #include <linux/ctype.h> |
f3f096cf SD |
13 | #include <linux/module.h> |
14 | #include <linux/uaccess.h> | |
15 | #include <linux/uprobes.h> | |
16 | #include <linux/namei.h> | |
b2e902f0 | 17 | #include <linux/string.h> |
b2d09103 | 18 | #include <linux/rculist.h> |
8c7dcb84 | 19 | #include <linux/filter.h> |
f3f096cf | 20 | |
0597c49c | 21 | #include "trace_dynevent.h" |
f3f096cf | 22 | #include "trace_probe.h" |
53305928 | 23 | #include "trace_probe_tmpl.h" |
f3f096cf SD |
24 | |
25 | #define UPROBE_EVENT_SYSTEM "uprobes" | |
26 | ||
457d1772 ON |
27 | struct uprobe_trace_entry_head { |
28 | struct trace_entry ent; | |
29 | unsigned long vaddr[]; | |
30 | }; | |
31 | ||
32 | #define SIZEOF_TRACE_ENTRY(is_return) \ | |
33 | (sizeof(struct uprobe_trace_entry_head) + \ | |
34 | sizeof(unsigned long) * (is_return ? 2 : 1)) | |
35 | ||
36 | #define DATAOF_TRACE_ENTRY(entry, is_return) \ | |
37 | ((void*)(entry) + SIZEOF_TRACE_ENTRY(is_return)) | |
38 | ||
d262271d | 39 | static int trace_uprobe_create(const char *raw_command); |
0597c49c MH |
40 | static int trace_uprobe_show(struct seq_file *m, struct dyn_event *ev); |
41 | static int trace_uprobe_release(struct dyn_event *ev); | |
42 | static bool trace_uprobe_is_busy(struct dyn_event *ev); | |
43 | static bool trace_uprobe_match(const char *system, const char *event, | |
30199137 | 44 | int argc, const char **argv, struct dyn_event *ev); |
0597c49c MH |
45 | |
46 | static struct dyn_event_operations trace_uprobe_ops = { | |
47 | .create = trace_uprobe_create, | |
48 | .show = trace_uprobe_show, | |
49 | .is_busy = trace_uprobe_is_busy, | |
50 | .free = trace_uprobe_release, | |
51 | .match = trace_uprobe_match, | |
52 | }; | |
53 | ||
f3f096cf SD |
54 | /* |
55 | * uprobe event core functions | |
56 | */ | |
f3f096cf | 57 | struct trace_uprobe { |
0597c49c | 58 | struct dyn_event devent; |
a932b738 | 59 | struct uprobe_consumer consumer; |
0c92c7a3 | 60 | struct path path; |
f3f096cf SD |
61 | struct inode *inode; |
62 | char *filename; | |
63 | unsigned long offset; | |
1cc33161 | 64 | unsigned long ref_ctr_offset; |
f3f096cf | 65 | unsigned long nhit; |
14577c39 | 66 | struct trace_probe tp; |
f3f096cf SD |
67 | }; |
68 | ||
0597c49c MH |
69 | static bool is_trace_uprobe(struct dyn_event *ev) |
70 | { | |
71 | return ev->ops == &trace_uprobe_ops; | |
72 | } | |
73 | ||
74 | static struct trace_uprobe *to_trace_uprobe(struct dyn_event *ev) | |
75 | { | |
76 | return container_of(ev, struct trace_uprobe, devent); | |
77 | } | |
78 | ||
79 | /** | |
80 | * for_each_trace_uprobe - iterate over the trace_uprobe list | |
81 | * @pos: the struct trace_uprobe * for each entry | |
82 | * @dpos: the struct dyn_event * to use as a loop cursor | |
83 | */ | |
84 | #define for_each_trace_uprobe(pos, dpos) \ | |
85 | for_each_dyn_event(dpos) \ | |
86 | if (is_trace_uprobe(dpos) && (pos = to_trace_uprobe(dpos))) | |
87 | ||
f3f096cf | 88 | static int register_uprobe_event(struct trace_uprobe *tu); |
c6c2401d | 89 | static int unregister_uprobe_event(struct trace_uprobe *tu); |
f3f096cf | 90 | |
b7e0bf34 NK |
91 | struct uprobe_dispatch_data { |
92 | struct trace_uprobe *tu; | |
93 | unsigned long bp_addr; | |
94 | }; | |
95 | ||
f3f096cf | 96 | static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs); |
c1ae5c75 ON |
97 | static int uretprobe_dispatcher(struct uprobe_consumer *con, |
98 | unsigned long func, struct pt_regs *regs); | |
f3f096cf | 99 | |
3fd996a2 NK |
100 | #ifdef CONFIG_STACK_GROWSUP |
101 | static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n) | |
102 | { | |
103 | return addr - (n * sizeof(long)); | |
104 | } | |
105 | #else | |
106 | static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n) | |
107 | { | |
108 | return addr + (n * sizeof(long)); | |
109 | } | |
110 | #endif | |
111 | ||
112 | static unsigned long get_user_stack_nth(struct pt_regs *regs, unsigned int n) | |
113 | { | |
114 | unsigned long ret; | |
115 | unsigned long addr = user_stack_pointer(regs); | |
116 | ||
117 | addr = adjust_stack_addr(addr, n); | |
118 | ||
119 | if (copy_from_user(&ret, (void __force __user *) addr, sizeof(ret))) | |
120 | return 0; | |
121 | ||
122 | return ret; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Uprobes-specific fetch functions | |
127 | */ | |
53305928 | 128 | static nokprobe_inline int |
9b960a38 | 129 | probe_mem_read(void *dest, void *src, size_t size) |
53305928 MH |
130 | { |
131 | void __user *vaddr = (void __force __user *)src; | |
132 | ||
f3f58935 | 133 | return copy_from_user(dest, vaddr, size) ? -EFAULT : 0; |
5baaa59e | 134 | } |
e65f7ae7 MH |
135 | |
136 | static nokprobe_inline int | |
137 | probe_mem_read_user(void *dest, void *src, size_t size) | |
138 | { | |
139 | return probe_mem_read(dest, src, size); | |
140 | } | |
141 | ||
5baaa59e NK |
142 | /* |
143 | * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max | |
144 | * length and relative data location. | |
145 | */ | |
9178412d MH |
146 | static nokprobe_inline int |
147 | fetch_store_string(unsigned long addr, void *dest, void *base) | |
5baaa59e NK |
148 | { |
149 | long ret; | |
9178412d MH |
150 | u32 loc = *(u32 *)dest; |
151 | int maxlen = get_loc_len(loc); | |
152 | u8 *dst = get_loc_data(dest, base); | |
5baaa59e NK |
153 | void __user *src = (void __force __user *) addr; |
154 | ||
9178412d MH |
155 | if (unlikely(!maxlen)) |
156 | return -ENOMEM; | |
5baaa59e | 157 | |
4dd537ac MH |
158 | if (addr == FETCH_TOKEN_COMM) |
159 | ret = strlcpy(dst, current->comm, maxlen); | |
160 | else | |
161 | ret = strncpy_from_user(dst, src, maxlen); | |
9178412d MH |
162 | if (ret >= 0) { |
163 | if (ret == maxlen) | |
164 | dst[ret - 1] = '\0'; | |
0722069a AZ |
165 | else |
166 | /* | |
167 | * Include the terminating null byte. In this case it | |
168 | * was copied by strncpy_from_user but not accounted | |
169 | * for in ret. | |
170 | */ | |
171 | ret++; | |
9178412d | 172 | *(u32 *)dest = make_data_loc(ret, (void *)dst - base); |
5baaa59e | 173 | } |
9178412d MH |
174 | |
175 | return ret; | |
5baaa59e NK |
176 | } |
177 | ||
88903c46 MH |
178 | static nokprobe_inline int |
179 | fetch_store_string_user(unsigned long addr, void *dest, void *base) | |
180 | { | |
181 | return fetch_store_string(addr, dest, base); | |
182 | } | |
183 | ||
53305928 | 184 | /* Return the length of string -- including null terminal byte */ |
9178412d MH |
185 | static nokprobe_inline int |
186 | fetch_store_strlen(unsigned long addr) | |
5baaa59e NK |
187 | { |
188 | int len; | |
189 | void __user *vaddr = (void __force __user *) addr; | |
190 | ||
4dd537ac MH |
191 | if (addr == FETCH_TOKEN_COMM) |
192 | len = strlen(current->comm) + 1; | |
193 | else | |
194 | len = strnlen_user(vaddr, MAX_STRING_SIZE); | |
5baaa59e | 195 | |
9178412d | 196 | return (len > MAX_STRING_SIZE) ? 0 : len; |
5baaa59e | 197 | } |
3fd996a2 | 198 | |
88903c46 MH |
199 | static nokprobe_inline int |
200 | fetch_store_strlen_user(unsigned long addr) | |
201 | { | |
202 | return fetch_store_strlen(addr); | |
203 | } | |
204 | ||
53305928 | 205 | static unsigned long translate_user_vaddr(unsigned long file_offset) |
b7e0bf34 NK |
206 | { |
207 | unsigned long base_addr; | |
208 | struct uprobe_dispatch_data *udd; | |
209 | ||
210 | udd = (void *) current->utask->vaddr; | |
211 | ||
212 | base_addr = udd->bp_addr - udd->tu->offset; | |
53305928 | 213 | return base_addr + file_offset; |
b7e0bf34 | 214 | } |
b7e0bf34 | 215 | |
53305928 MH |
216 | /* Note that we don't verify it, since the code does not come from user space */ |
217 | static int | |
8565a45d | 218 | process_fetch_insn(struct fetch_insn *code, void *rec, void *dest, |
9178412d | 219 | void *base) |
53305928 | 220 | { |
8565a45d | 221 | struct pt_regs *regs = rec; |
53305928 | 222 | unsigned long val; |
bd78acc8 | 223 | int ret; |
53305928 MH |
224 | |
225 | /* 1st stage: get value from context */ | |
226 | switch (code->op) { | |
227 | case FETCH_OP_REG: | |
228 | val = regs_get_register(regs, code->param); | |
229 | break; | |
230 | case FETCH_OP_STACK: | |
231 | val = get_user_stack_nth(regs, code->param); | |
232 | break; | |
233 | case FETCH_OP_STACKP: | |
234 | val = user_stack_pointer(regs); | |
235 | break; | |
236 | case FETCH_OP_RETVAL: | |
237 | val = regs_return_value(regs); | |
238 | break; | |
4dd537ac MH |
239 | case FETCH_OP_COMM: |
240 | val = FETCH_TOKEN_COMM; | |
241 | break; | |
53305928 MH |
242 | case FETCH_OP_FOFFS: |
243 | val = translate_user_vaddr(code->immediate); | |
244 | break; | |
245 | default: | |
bd78acc8 SC |
246 | ret = process_common_fetch_insn(code, &val); |
247 | if (ret < 0) | |
248 | return ret; | |
53305928 MH |
249 | } |
250 | code++; | |
251 | ||
9b960a38 | 252 | return process_fetch_insn_bottom(code, val, dest, base); |
53305928 MH |
253 | } |
254 | NOKPROBE_SYMBOL(process_fetch_insn) | |
255 | ||
736288ba ON |
256 | static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter) |
257 | { | |
258 | rwlock_init(&filter->rwlock); | |
259 | filter->nr_systemwide = 0; | |
260 | INIT_LIST_HEAD(&filter->perf_events); | |
261 | } | |
262 | ||
263 | static inline bool uprobe_filter_is_empty(struct trace_uprobe_filter *filter) | |
264 | { | |
265 | return !filter->nr_systemwide && list_empty(&filter->perf_events); | |
266 | } | |
267 | ||
c1ae5c75 ON |
268 | static inline bool is_ret_probe(struct trace_uprobe *tu) |
269 | { | |
270 | return tu->consumer.ret_handler != NULL; | |
271 | } | |
272 | ||
0597c49c MH |
273 | static bool trace_uprobe_is_busy(struct dyn_event *ev) |
274 | { | |
275 | struct trace_uprobe *tu = to_trace_uprobe(ev); | |
276 | ||
277 | return trace_probe_is_enabled(&tu->tp); | |
278 | } | |
279 | ||
ab10d69e MH |
280 | static bool trace_uprobe_match_command_head(struct trace_uprobe *tu, |
281 | int argc, const char **argv) | |
282 | { | |
283 | char buf[MAX_ARGSTR_LEN + 1]; | |
284 | int len; | |
285 | ||
286 | if (!argc) | |
287 | return true; | |
288 | ||
289 | len = strlen(tu->filename); | |
290 | if (strncmp(tu->filename, argv[0], len) || argv[0][len] != ':') | |
291 | return false; | |
292 | ||
293 | if (tu->ref_ctr_offset == 0) | |
294 | snprintf(buf, sizeof(buf), "0x%0*lx", | |
295 | (int)(sizeof(void *) * 2), tu->offset); | |
296 | else | |
297 | snprintf(buf, sizeof(buf), "0x%0*lx(0x%lx)", | |
298 | (int)(sizeof(void *) * 2), tu->offset, | |
299 | tu->ref_ctr_offset); | |
300 | if (strcmp(buf, &argv[0][len + 1])) | |
301 | return false; | |
302 | ||
303 | argc--; argv++; | |
304 | ||
305 | return trace_probe_match_command_args(&tu->tp, argc, argv); | |
306 | } | |
307 | ||
0597c49c | 308 | static bool trace_uprobe_match(const char *system, const char *event, |
30199137 | 309 | int argc, const char **argv, struct dyn_event *ev) |
0597c49c MH |
310 | { |
311 | struct trace_uprobe *tu = to_trace_uprobe(ev); | |
312 | ||
95c104c3 LY |
313 | return (event[0] == '\0' || |
314 | strcmp(trace_probe_name(&tu->tp), event) == 0) && | |
ab10d69e MH |
315 | (!system || strcmp(trace_probe_group_name(&tu->tp), system) == 0) && |
316 | trace_uprobe_match_command_head(tu, argc, argv); | |
0597c49c MH |
317 | } |
318 | ||
60d53e2c MH |
319 | static nokprobe_inline struct trace_uprobe * |
320 | trace_uprobe_primary_from_call(struct trace_event_call *call) | |
321 | { | |
322 | struct trace_probe *tp; | |
323 | ||
324 | tp = trace_probe_primary_from_call(call); | |
325 | if (WARN_ON_ONCE(!tp)) | |
326 | return NULL; | |
327 | ||
328 | return container_of(tp, struct trace_uprobe, tp); | |
329 | } | |
330 | ||
f3f096cf SD |
331 | /* |
332 | * Allocate new trace_uprobe and initialize it (including uprobes). | |
333 | */ | |
334 | static struct trace_uprobe * | |
c1ae5c75 | 335 | alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret) |
f3f096cf SD |
336 | { |
337 | struct trace_uprobe *tu; | |
455b2899 | 338 | int ret; |
f3f096cf | 339 | |
845cbf3e | 340 | tu = kzalloc(struct_size(tu, tp.args, nargs), GFP_KERNEL); |
f3f096cf SD |
341 | if (!tu) |
342 | return ERR_PTR(-ENOMEM); | |
343 | ||
b61387cb | 344 | ret = trace_probe_init(&tu->tp, event, group, true); |
455b2899 | 345 | if (ret < 0) |
f3f096cf SD |
346 | goto error; |
347 | ||
0597c49c | 348 | dyn_event_init(&tu->devent, &trace_uprobe_ops); |
a932b738 | 349 | tu->consumer.handler = uprobe_dispatcher; |
c1ae5c75 ON |
350 | if (is_ret) |
351 | tu->consumer.ret_handler = uretprobe_dispatcher; | |
b61387cb | 352 | init_trace_uprobe_filter(tu->tp.event->filter); |
f3f096cf SD |
353 | return tu; |
354 | ||
355 | error: | |
f3f096cf SD |
356 | kfree(tu); |
357 | ||
455b2899 | 358 | return ERR_PTR(ret); |
f3f096cf SD |
359 | } |
360 | ||
361 | static void free_trace_uprobe(struct trace_uprobe *tu) | |
362 | { | |
0597c49c MH |
363 | if (!tu) |
364 | return; | |
365 | ||
0c92c7a3 | 366 | path_put(&tu->path); |
455b2899 | 367 | trace_probe_cleanup(&tu->tp); |
f3f096cf SD |
368 | kfree(tu->filename); |
369 | kfree(tu); | |
370 | } | |
371 | ||
372 | static struct trace_uprobe *find_probe_event(const char *event, const char *group) | |
373 | { | |
0597c49c | 374 | struct dyn_event *pos; |
f3f096cf SD |
375 | struct trace_uprobe *tu; |
376 | ||
0597c49c | 377 | for_each_trace_uprobe(tu, pos) |
b55ce203 MH |
378 | if (strcmp(trace_probe_name(&tu->tp), event) == 0 && |
379 | strcmp(trace_probe_group_name(&tu->tp), group) == 0) | |
f3f096cf SD |
380 | return tu; |
381 | ||
382 | return NULL; | |
383 | } | |
384 | ||
0597c49c | 385 | /* Unregister a trace_uprobe and probe_event */ |
c6c2401d | 386 | static int unregister_trace_uprobe(struct trace_uprobe *tu) |
f3f096cf | 387 | { |
c6c2401d SRRH |
388 | int ret; |
389 | ||
41af3cf5 MH |
390 | if (trace_probe_has_sibling(&tu->tp)) |
391 | goto unreg; | |
392 | ||
1d18538e SRV |
393 | /* If there's a reference to the dynamic event */ |
394 | if (trace_event_dyn_busy(trace_probe_event_call(&tu->tp))) | |
395 | return -EBUSY; | |
396 | ||
c6c2401d SRRH |
397 | ret = unregister_uprobe_event(tu); |
398 | if (ret) | |
399 | return ret; | |
400 | ||
41af3cf5 | 401 | unreg: |
0597c49c | 402 | dyn_event_remove(&tu->devent); |
41af3cf5 | 403 | trace_probe_unlink(&tu->tp); |
f3f096cf | 404 | free_trace_uprobe(tu); |
c6c2401d | 405 | return 0; |
f3f096cf SD |
406 | } |
407 | ||
fe60b0ce MH |
408 | static bool trace_uprobe_has_same_uprobe(struct trace_uprobe *orig, |
409 | struct trace_uprobe *comp) | |
410 | { | |
411 | struct trace_probe_event *tpe = orig->tp.event; | |
fe60b0ce MH |
412 | struct inode *comp_inode = d_real_inode(comp->path.dentry); |
413 | int i; | |
414 | ||
e161c6bf | 415 | list_for_each_entry(orig, &tpe->probes, tp.list) { |
fe60b0ce MH |
416 | if (comp_inode != d_real_inode(orig->path.dentry) || |
417 | comp->offset != orig->offset) | |
418 | continue; | |
419 | ||
420 | /* | |
421 | * trace_probe_compare_arg_type() ensured that nr_args and | |
422 | * each argument name and type are same. Let's compare comm. | |
423 | */ | |
424 | for (i = 0; i < orig->tp.nr_args; i++) { | |
425 | if (strcmp(orig->tp.args[i].comm, | |
426 | comp->tp.args[i].comm)) | |
f8d7ab2b | 427 | break; |
fe60b0ce MH |
428 | } |
429 | ||
f8d7ab2b SD |
430 | if (i == orig->tp.nr_args) |
431 | return true; | |
fe60b0ce MH |
432 | } |
433 | ||
434 | return false; | |
435 | } | |
436 | ||
41af3cf5 MH |
437 | static int append_trace_uprobe(struct trace_uprobe *tu, struct trace_uprobe *to) |
438 | { | |
439 | int ret; | |
440 | ||
fe60b0ce MH |
441 | ret = trace_probe_compare_arg_type(&tu->tp, &to->tp); |
442 | if (ret) { | |
443 | /* Note that argument starts index = 2 */ | |
444 | trace_probe_log_set_index(ret + 1); | |
445 | trace_probe_log_err(0, DIFF_ARG_TYPE); | |
446 | return -EEXIST; | |
447 | } | |
448 | if (trace_uprobe_has_same_uprobe(to, tu)) { | |
449 | trace_probe_log_set_index(0); | |
450 | trace_probe_log_err(0, SAME_PROBE); | |
451 | return -EEXIST; | |
452 | } | |
453 | ||
41af3cf5 MH |
454 | /* Append to existing event */ |
455 | ret = trace_probe_append(&tu->tp, &to->tp); | |
456 | if (!ret) | |
8b0e6c74 | 457 | dyn_event_add(&tu->devent, trace_probe_event_call(&tu->tp)); |
41af3cf5 MH |
458 | |
459 | return ret; | |
460 | } | |
461 | ||
ccea8727 RB |
462 | /* |
463 | * Uprobe with multiple reference counter is not allowed. i.e. | |
464 | * If inode and offset matches, reference counter offset *must* | |
465 | * match as well. Though, there is one exception: If user is | |
466 | * replacing old trace_uprobe with new one(same group/event), | |
467 | * then we allow same uprobe with new reference counter as far | |
468 | * as the new one does not conflict with any other existing | |
469 | * ones. | |
470 | */ | |
41af3cf5 | 471 | static int validate_ref_ctr_offset(struct trace_uprobe *new) |
ccea8727 | 472 | { |
0597c49c | 473 | struct dyn_event *pos; |
41af3cf5 | 474 | struct trace_uprobe *tmp; |
ccea8727 RB |
475 | struct inode *new_inode = d_real_inode(new->path.dentry); |
476 | ||
0597c49c | 477 | for_each_trace_uprobe(tmp, pos) { |
41af3cf5 | 478 | if (new_inode == d_real_inode(tmp->path.dentry) && |
ccea8727 RB |
479 | new->offset == tmp->offset && |
480 | new->ref_ctr_offset != tmp->ref_ctr_offset) { | |
481 | pr_warn("Reference counter offset mismatch."); | |
41af3cf5 | 482 | return -EINVAL; |
ccea8727 RB |
483 | } |
484 | } | |
41af3cf5 | 485 | return 0; |
ccea8727 RB |
486 | } |
487 | ||
f3f096cf SD |
488 | /* Register a trace_uprobe and probe_event */ |
489 | static int register_trace_uprobe(struct trace_uprobe *tu) | |
490 | { | |
14577c39 | 491 | struct trace_uprobe *old_tu; |
f3f096cf SD |
492 | int ret; |
493 | ||
0597c49c | 494 | mutex_lock(&event_mutex); |
f3f096cf | 495 | |
41af3cf5 MH |
496 | ret = validate_ref_ctr_offset(tu); |
497 | if (ret) | |
ccea8727 | 498 | goto end; |
ccea8727 | 499 | |
41af3cf5 MH |
500 | /* register as an event */ |
501 | old_tu = find_probe_event(trace_probe_name(&tu->tp), | |
502 | trace_probe_group_name(&tu->tp)); | |
14577c39 | 503 | if (old_tu) { |
41af3cf5 MH |
504 | if (is_ret_probe(tu) != is_ret_probe(old_tu)) { |
505 | trace_probe_log_set_index(0); | |
506 | trace_probe_log_err(0, DIFF_PROBE_TYPE); | |
507 | ret = -EEXIST; | |
508 | } else { | |
fe60b0ce | 509 | ret = append_trace_uprobe(tu, old_tu); |
41af3cf5 MH |
510 | } |
511 | goto end; | |
c6c2401d | 512 | } |
f3f096cf SD |
513 | |
514 | ret = register_uprobe_event(tu); | |
515 | if (ret) { | |
8e242060 MH |
516 | if (ret == -EEXIST) { |
517 | trace_probe_log_set_index(0); | |
518 | trace_probe_log_err(0, EVENT_EXIST); | |
519 | } else | |
520 | pr_warn("Failed to register probe event(%d)\n", ret); | |
f3f096cf SD |
521 | goto end; |
522 | } | |
523 | ||
8b0e6c74 | 524 | dyn_event_add(&tu->devent, trace_probe_event_call(&tu->tp)); |
f3f096cf SD |
525 | |
526 | end: | |
0597c49c | 527 | mutex_unlock(&event_mutex); |
f3f096cf SD |
528 | |
529 | return ret; | |
530 | } | |
531 | ||
532 | /* | |
533 | * Argument syntax: | |
95c104c3 | 534 | * - Add uprobe: p|r[:[GRP/][EVENT]] PATH:OFFSET[%return][(REF)] [FETCHARGS] |
f3f096cf | 535 | */ |
d262271d | 536 | static int __trace_uprobe_create(int argc, const char **argv) |
f3f096cf SD |
537 | { |
538 | struct trace_uprobe *tu; | |
0597c49c MH |
539 | const char *event = NULL, *group = UPROBE_EVENT_SYSTEM; |
540 | char *arg, *filename, *rctr, *rctr_end, *tmp; | |
f3f096cf | 541 | char buf[MAX_EVENT_NAME_LEN]; |
95c104c3 | 542 | char gbuf[MAX_EVENT_NAME_LEN]; |
007517a0 | 543 | enum probe_print_type ptype; |
f3f096cf | 544 | struct path path; |
1cc33161 | 545 | unsigned long offset, ref_ctr_offset; |
0597c49c | 546 | bool is_return = false; |
f3f096cf SD |
547 | int i, ret; |
548 | ||
1cc33161 | 549 | ref_ctr_offset = 0; |
f3f096cf | 550 | |
f01098c7 ET |
551 | switch (argv[0][0]) { |
552 | case 'r': | |
4ee5a52e | 553 | is_return = true; |
f01098c7 ET |
554 | break; |
555 | case 'p': | |
556 | break; | |
557 | default: | |
558 | return -ECANCELED; | |
559 | } | |
560 | ||
561 | if (argc < 2) | |
0597c49c | 562 | return -ECANCELED; |
f3f096cf | 563 | |
0597c49c | 564 | if (argv[0][1] == ':') |
f3f096cf | 565 | event = &argv[0][2]; |
f3f096cf | 566 | |
0597c49c MH |
567 | if (!strchr(argv[1], '/')) |
568 | return -ECANCELED; | |
f3f096cf | 569 | |
0597c49c MH |
570 | filename = kstrdup(argv[1], GFP_KERNEL); |
571 | if (!filename) | |
572 | return -ENOMEM; | |
f3f096cf | 573 | |
6496bb72 | 574 | /* Find the last occurrence, in case the path contains ':' too. */ |
0597c49c MH |
575 | arg = strrchr(filename, ':'); |
576 | if (!arg || !isdigit(arg[1])) { | |
577 | kfree(filename); | |
578 | return -ECANCELED; | |
579 | } | |
f3f096cf | 580 | |
ab105a4f MH |
581 | trace_probe_log_init("trace_uprobe", argc, argv); |
582 | trace_probe_log_set_index(1); /* filename is the 2nd argument */ | |
583 | ||
f3f096cf | 584 | *arg++ = '\0'; |
f3f096cf | 585 | ret = kern_path(filename, LOOKUP_FOLLOW, &path); |
0597c49c | 586 | if (ret) { |
ab105a4f | 587 | trace_probe_log_err(0, FILE_NOT_FOUND); |
0597c49c | 588 | kfree(filename); |
ab105a4f | 589 | trace_probe_log_clear(); |
0c92c7a3 | 590 | return ret; |
0597c49c | 591 | } |
0c92c7a3 | 592 | if (!d_is_reg(path.dentry)) { |
ab105a4f | 593 | trace_probe_log_err(0, NO_REGULAR_FILE); |
d24d7dbf JZ |
594 | ret = -EINVAL; |
595 | goto fail_address_parse; | |
596 | } | |
f3f096cf | 597 | |
1cc33161 RB |
598 | /* Parse reference counter offset if specified. */ |
599 | rctr = strchr(arg, '('); | |
600 | if (rctr) { | |
601 | rctr_end = strchr(rctr, ')'); | |
ab105a4f MH |
602 | if (!rctr_end) { |
603 | ret = -EINVAL; | |
604 | rctr_end = rctr + strlen(rctr); | |
605 | trace_probe_log_err(rctr_end - filename, | |
606 | REFCNT_OPEN_BRACE); | |
607 | goto fail_address_parse; | |
608 | } else if (rctr_end[1] != '\0') { | |
1cc33161 | 609 | ret = -EINVAL; |
ab105a4f MH |
610 | trace_probe_log_err(rctr_end + 1 - filename, |
611 | BAD_REFCNT_SUFFIX); | |
1cc33161 RB |
612 | goto fail_address_parse; |
613 | } | |
614 | ||
615 | *rctr++ = '\0'; | |
616 | *rctr_end = '\0'; | |
617 | ret = kstrtoul(rctr, 0, &ref_ctr_offset); | |
618 | if (ret) { | |
ab105a4f | 619 | trace_probe_log_err(rctr - filename, BAD_REFCNT); |
1cc33161 RB |
620 | goto fail_address_parse; |
621 | } | |
622 | } | |
623 | ||
3dd3aae3 MH |
624 | /* Check if there is %return suffix */ |
625 | tmp = strchr(arg, '%'); | |
626 | if (tmp) { | |
627 | if (!strcmp(tmp, "%return")) { | |
628 | *tmp = '\0'; | |
629 | is_return = true; | |
630 | } else { | |
631 | trace_probe_log_err(tmp - filename, BAD_ADDR_SUFFIX); | |
632 | ret = -EINVAL; | |
633 | goto fail_address_parse; | |
634 | } | |
635 | } | |
636 | ||
1cc33161 | 637 | /* Parse uprobe offset. */ |
84d7ed79 | 638 | ret = kstrtoul(arg, 0, &offset); |
ab105a4f MH |
639 | if (ret) { |
640 | trace_probe_log_err(arg - filename, BAD_UPROBE_OFFS); | |
84d7ed79 | 641 | goto fail_address_parse; |
ab105a4f | 642 | } |
f3f096cf SD |
643 | |
644 | /* setup a probe */ | |
ab105a4f | 645 | trace_probe_log_set_index(0); |
0597c49c | 646 | if (event) { |
95c104c3 | 647 | ret = traceprobe_parse_event_name(&event, &group, gbuf, |
ab105a4f | 648 | event - argv[0]); |
0597c49c MH |
649 | if (ret) |
650 | goto fail_address_parse; | |
95c104c3 LY |
651 | } |
652 | ||
653 | if (!event) { | |
b2e902f0 | 654 | char *tail; |
f3f096cf SD |
655 | char *ptr; |
656 | ||
b2e902f0 AS |
657 | tail = kstrdup(kbasename(filename), GFP_KERNEL); |
658 | if (!tail) { | |
f3f096cf SD |
659 | ret = -ENOMEM; |
660 | goto fail_address_parse; | |
661 | } | |
662 | ||
f3f096cf SD |
663 | ptr = strpbrk(tail, ".-_"); |
664 | if (ptr) | |
665 | *ptr = '\0'; | |
666 | ||
667 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_0x%lx", 'p', tail, offset); | |
668 | event = buf; | |
669 | kfree(tail); | |
670 | } | |
671 | ||
ab105a4f MH |
672 | argc -= 2; |
673 | argv += 2; | |
674 | ||
4ee5a52e | 675 | tu = alloc_trace_uprobe(group, event, argc, is_return); |
f3f096cf | 676 | if (IS_ERR(tu)) { |
f3f096cf | 677 | ret = PTR_ERR(tu); |
a039480e MH |
678 | /* This must return -ENOMEM otherwise there is a bug */ |
679 | WARN_ON_ONCE(ret != -ENOMEM); | |
f3f096cf SD |
680 | goto fail_address_parse; |
681 | } | |
682 | tu->offset = offset; | |
1cc33161 | 683 | tu->ref_ctr_offset = ref_ctr_offset; |
0c92c7a3 | 684 | tu->path = path; |
0597c49c | 685 | tu->filename = filename; |
f3f096cf SD |
686 | |
687 | /* parse arguments */ | |
f3f096cf | 688 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { |
ab105a4f | 689 | trace_probe_log_set_index(i + 2); |
fcd9db51 | 690 | ret = traceprobe_parse_probe_arg(&tu->tp, i, argv[i], |
d4505aa6 MHG |
691 | (is_return ? TPARG_FL_RETURN : 0) | |
692 | TPARG_FL_USER); | |
d00bbea9 | 693 | if (ret) |
f3f096cf | 694 | goto error; |
f3f096cf SD |
695 | } |
696 | ||
007517a0 SRV |
697 | ptype = is_ret_probe(tu) ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL; |
698 | ret = traceprobe_set_print_fmt(&tu->tp, ptype); | |
b4d4b96b MH |
699 | if (ret < 0) |
700 | goto error; | |
701 | ||
f3f096cf | 702 | ret = register_trace_uprobe(tu); |
ab105a4f MH |
703 | if (!ret) |
704 | goto out; | |
f3f096cf SD |
705 | |
706 | error: | |
707 | free_trace_uprobe(tu); | |
ab105a4f MH |
708 | out: |
709 | trace_probe_log_clear(); | |
f3f096cf SD |
710 | return ret; |
711 | ||
712 | fail_address_parse: | |
ab105a4f | 713 | trace_probe_log_clear(); |
0c92c7a3 | 714 | path_put(&path); |
0597c49c | 715 | kfree(filename); |
f3f096cf | 716 | |
f3f096cf SD |
717 | return ret; |
718 | } | |
719 | ||
d262271d MH |
720 | int trace_uprobe_create(const char *raw_command) |
721 | { | |
722 | return trace_probe_create(raw_command, __trace_uprobe_create); | |
723 | } | |
724 | ||
725 | static int create_or_delete_trace_uprobe(const char *raw_command) | |
f3f096cf | 726 | { |
0597c49c | 727 | int ret; |
f3f096cf | 728 | |
d262271d MH |
729 | if (raw_command[0] == '-') |
730 | return dyn_event_release(raw_command, &trace_uprobe_ops); | |
f3f096cf | 731 | |
d262271d | 732 | ret = trace_uprobe_create(raw_command); |
0597c49c | 733 | return ret == -ECANCELED ? -EINVAL : ret; |
f3f096cf SD |
734 | } |
735 | ||
0597c49c | 736 | static int trace_uprobe_release(struct dyn_event *ev) |
f3f096cf | 737 | { |
0597c49c | 738 | struct trace_uprobe *tu = to_trace_uprobe(ev); |
f3f096cf | 739 | |
0597c49c | 740 | return unregister_trace_uprobe(tu); |
f3f096cf SD |
741 | } |
742 | ||
0597c49c MH |
743 | /* Probes listing interfaces */ |
744 | static int trace_uprobe_show(struct seq_file *m, struct dyn_event *ev) | |
f3f096cf | 745 | { |
0597c49c | 746 | struct trace_uprobe *tu = to_trace_uprobe(ev); |
3ede82dd | 747 | char c = is_ret_probe(tu) ? 'r' : 'p'; |
f3f096cf SD |
748 | int i; |
749 | ||
b55ce203 MH |
750 | seq_printf(m, "%c:%s/%s %s:0x%0*lx", c, trace_probe_group_name(&tu->tp), |
751 | trace_probe_name(&tu->tp), tu->filename, | |
a64b2c01 | 752 | (int)(sizeof(void *) * 2), tu->offset); |
f3f096cf | 753 | |
1cc33161 RB |
754 | if (tu->ref_ctr_offset) |
755 | seq_printf(m, "(0x%lx)", tu->ref_ctr_offset); | |
756 | ||
14577c39 NK |
757 | for (i = 0; i < tu->tp.nr_args; i++) |
758 | seq_printf(m, " %s=%s", tu->tp.args[i].name, tu->tp.args[i].comm); | |
f3f096cf | 759 | |
fa6f0cc7 | 760 | seq_putc(m, '\n'); |
f3f096cf SD |
761 | return 0; |
762 | } | |
763 | ||
0597c49c MH |
764 | static int probes_seq_show(struct seq_file *m, void *v) |
765 | { | |
766 | struct dyn_event *ev = v; | |
767 | ||
768 | if (!is_trace_uprobe(ev)) | |
769 | return 0; | |
770 | ||
771 | return trace_uprobe_show(m, ev); | |
772 | } | |
773 | ||
f3f096cf | 774 | static const struct seq_operations probes_seq_op = { |
0597c49c MH |
775 | .start = dyn_event_seq_start, |
776 | .next = dyn_event_seq_next, | |
777 | .stop = dyn_event_seq_stop, | |
778 | .show = probes_seq_show | |
f3f096cf SD |
779 | }; |
780 | ||
781 | static int probes_open(struct inode *inode, struct file *file) | |
782 | { | |
c6c2401d SRRH |
783 | int ret; |
784 | ||
17911ff3 SRV |
785 | ret = security_locked_down(LOCKDOWN_TRACEFS); |
786 | if (ret) | |
787 | return ret; | |
788 | ||
c6c2401d | 789 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { |
0597c49c | 790 | ret = dyn_events_release_all(&trace_uprobe_ops); |
c6c2401d SRRH |
791 | if (ret) |
792 | return ret; | |
793 | } | |
f3f096cf SD |
794 | |
795 | return seq_open(file, &probes_seq_op); | |
796 | } | |
797 | ||
798 | static ssize_t probes_write(struct file *file, const char __user *buffer, | |
799 | size_t count, loff_t *ppos) | |
800 | { | |
0597c49c MH |
801 | return trace_parse_run_command(file, buffer, count, ppos, |
802 | create_or_delete_trace_uprobe); | |
f3f096cf SD |
803 | } |
804 | ||
805 | static const struct file_operations uprobe_events_ops = { | |
806 | .owner = THIS_MODULE, | |
807 | .open = probes_open, | |
808 | .read = seq_read, | |
809 | .llseek = seq_lseek, | |
810 | .release = seq_release, | |
811 | .write = probes_write, | |
812 | }; | |
813 | ||
814 | /* Probes profiling interfaces */ | |
815 | static int probes_profile_seq_show(struct seq_file *m, void *v) | |
816 | { | |
0597c49c MH |
817 | struct dyn_event *ev = v; |
818 | struct trace_uprobe *tu; | |
819 | ||
820 | if (!is_trace_uprobe(ev)) | |
821 | return 0; | |
f3f096cf | 822 | |
0597c49c | 823 | tu = to_trace_uprobe(ev); |
de7b2973 | 824 | seq_printf(m, " %s %-44s %15lu\n", tu->filename, |
b55ce203 | 825 | trace_probe_name(&tu->tp), tu->nhit); |
f3f096cf SD |
826 | return 0; |
827 | } | |
828 | ||
829 | static const struct seq_operations profile_seq_op = { | |
0597c49c MH |
830 | .start = dyn_event_seq_start, |
831 | .next = dyn_event_seq_next, | |
832 | .stop = dyn_event_seq_stop, | |
f3f096cf SD |
833 | .show = probes_profile_seq_show |
834 | }; | |
835 | ||
836 | static int profile_open(struct inode *inode, struct file *file) | |
837 | { | |
17911ff3 SRV |
838 | int ret; |
839 | ||
840 | ret = security_locked_down(LOCKDOWN_TRACEFS); | |
841 | if (ret) | |
842 | return ret; | |
843 | ||
f3f096cf SD |
844 | return seq_open(file, &profile_seq_op); |
845 | } | |
846 | ||
847 | static const struct file_operations uprobe_profile_ops = { | |
848 | .owner = THIS_MODULE, | |
849 | .open = profile_open, | |
850 | .read = seq_read, | |
851 | .llseek = seq_lseek, | |
852 | .release = seq_release, | |
853 | }; | |
854 | ||
dcad1a20 NK |
855 | struct uprobe_cpu_buffer { |
856 | struct mutex mutex; | |
857 | void *buf; | |
858 | }; | |
859 | static struct uprobe_cpu_buffer __percpu *uprobe_cpu_buffer; | |
860 | static int uprobe_buffer_refcnt; | |
861 | ||
862 | static int uprobe_buffer_init(void) | |
863 | { | |
864 | int cpu, err_cpu; | |
865 | ||
866 | uprobe_cpu_buffer = alloc_percpu(struct uprobe_cpu_buffer); | |
867 | if (uprobe_cpu_buffer == NULL) | |
868 | return -ENOMEM; | |
869 | ||
870 | for_each_possible_cpu(cpu) { | |
871 | struct page *p = alloc_pages_node(cpu_to_node(cpu), | |
872 | GFP_KERNEL, 0); | |
873 | if (p == NULL) { | |
874 | err_cpu = cpu; | |
875 | goto err; | |
876 | } | |
877 | per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf = page_address(p); | |
878 | mutex_init(&per_cpu_ptr(uprobe_cpu_buffer, cpu)->mutex); | |
879 | } | |
880 | ||
881 | return 0; | |
882 | ||
883 | err: | |
884 | for_each_possible_cpu(cpu) { | |
885 | if (cpu == err_cpu) | |
886 | break; | |
887 | free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf); | |
888 | } | |
889 | ||
890 | free_percpu(uprobe_cpu_buffer); | |
891 | return -ENOMEM; | |
892 | } | |
893 | ||
894 | static int uprobe_buffer_enable(void) | |
895 | { | |
896 | int ret = 0; | |
897 | ||
898 | BUG_ON(!mutex_is_locked(&event_mutex)); | |
899 | ||
900 | if (uprobe_buffer_refcnt++ == 0) { | |
901 | ret = uprobe_buffer_init(); | |
902 | if (ret < 0) | |
903 | uprobe_buffer_refcnt--; | |
904 | } | |
905 | ||
906 | return ret; | |
907 | } | |
908 | ||
909 | static void uprobe_buffer_disable(void) | |
910 | { | |
6ea6215f J |
911 | int cpu; |
912 | ||
dcad1a20 NK |
913 | BUG_ON(!mutex_is_locked(&event_mutex)); |
914 | ||
915 | if (--uprobe_buffer_refcnt == 0) { | |
6ea6215f J |
916 | for_each_possible_cpu(cpu) |
917 | free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, | |
918 | cpu)->buf); | |
919 | ||
dcad1a20 NK |
920 | free_percpu(uprobe_cpu_buffer); |
921 | uprobe_cpu_buffer = NULL; | |
922 | } | |
923 | } | |
924 | ||
925 | static struct uprobe_cpu_buffer *uprobe_buffer_get(void) | |
926 | { | |
927 | struct uprobe_cpu_buffer *ucb; | |
928 | int cpu; | |
929 | ||
930 | cpu = raw_smp_processor_id(); | |
931 | ucb = per_cpu_ptr(uprobe_cpu_buffer, cpu); | |
932 | ||
933 | /* | |
934 | * Use per-cpu buffers for fastest access, but we might migrate | |
935 | * so the mutex makes sure we have sole access to it. | |
936 | */ | |
937 | mutex_lock(&ucb->mutex); | |
938 | ||
939 | return ucb; | |
940 | } | |
941 | ||
942 | static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb) | |
943 | { | |
944 | mutex_unlock(&ucb->mutex); | |
945 | } | |
946 | ||
a43b9704 | 947 | static void __uprobe_trace_func(struct trace_uprobe *tu, |
dd9fa555 | 948 | unsigned long func, struct pt_regs *regs, |
70ed91c6 | 949 | struct uprobe_cpu_buffer *ucb, int dsize, |
7f1d2f82 | 950 | struct trace_event_file *trace_file) |
f3f096cf SD |
951 | { |
952 | struct uprobe_trace_entry_head *entry; | |
b7d5eb26 | 953 | struct trace_event_buffer fbuffer; |
457d1772 | 954 | void *data; |
dd9fa555 | 955 | int size, esize; |
e3dc9f89 | 956 | struct trace_event_call *call = trace_probe_event_call(&tu->tp); |
f3f096cf | 957 | |
7f1d2f82 | 958 | WARN_ON(call != trace_file->event_call); |
70ed91c6 | 959 | |
dd9fa555 | 960 | if (WARN_ON_ONCE(tu->tp.size + dsize > PAGE_SIZE)) |
dcad1a20 NK |
961 | return; |
962 | ||
09a5059a | 963 | if (trace_trigger_soft_disabled(trace_file)) |
ca3b1620 NK |
964 | return; |
965 | ||
dd9fa555 | 966 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); |
dcad1a20 | 967 | size = esize + tu->tp.size + dsize; |
b7d5eb26 SRV |
968 | entry = trace_event_buffer_reserve(&fbuffer, trace_file, size); |
969 | if (!entry) | |
dd9fa555 | 970 | return; |
f3f096cf | 971 | |
393a736c ON |
972 | if (is_ret_probe(tu)) { |
973 | entry->vaddr[0] = func; | |
974 | entry->vaddr[1] = instruction_pointer(regs); | |
975 | data = DATAOF_TRACE_ENTRY(entry, true); | |
976 | } else { | |
977 | entry->vaddr[0] = instruction_pointer(regs); | |
978 | data = DATAOF_TRACE_ENTRY(entry, false); | |
979 | } | |
980 | ||
dcad1a20 | 981 | memcpy(data, ucb->buf, tu->tp.size + dsize); |
f3f096cf | 982 | |
b7d5eb26 | 983 | trace_event_buffer_commit(&fbuffer); |
a51cc604 | 984 | } |
f42d24a1 | 985 | |
a51cc604 | 986 | /* uprobe handler */ |
dd9fa555 NK |
987 | static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs, |
988 | struct uprobe_cpu_buffer *ucb, int dsize) | |
a51cc604 | 989 | { |
70ed91c6 J |
990 | struct event_file_link *link; |
991 | ||
992 | if (is_ret_probe(tu)) | |
993 | return 0; | |
994 | ||
995 | rcu_read_lock(); | |
b5f935ee | 996 | trace_probe_for_each_link_rcu(link, &tu->tp) |
70ed91c6 J |
997 | __uprobe_trace_func(tu, 0, regs, ucb, dsize, link->file); |
998 | rcu_read_unlock(); | |
999 | ||
f42d24a1 | 1000 | return 0; |
f3f096cf SD |
1001 | } |
1002 | ||
c1ae5c75 | 1003 | static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func, |
dd9fa555 NK |
1004 | struct pt_regs *regs, |
1005 | struct uprobe_cpu_buffer *ucb, int dsize) | |
c1ae5c75 | 1006 | { |
70ed91c6 J |
1007 | struct event_file_link *link; |
1008 | ||
1009 | rcu_read_lock(); | |
b5f935ee | 1010 | trace_probe_for_each_link_rcu(link, &tu->tp) |
70ed91c6 J |
1011 | __uprobe_trace_func(tu, func, regs, ucb, dsize, link->file); |
1012 | rcu_read_unlock(); | |
c1ae5c75 ON |
1013 | } |
1014 | ||
f3f096cf SD |
1015 | /* Event entry printers */ |
1016 | static enum print_line_t | |
1017 | print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event) | |
1018 | { | |
457d1772 | 1019 | struct uprobe_trace_entry_head *entry; |
f3f096cf SD |
1020 | struct trace_seq *s = &iter->seq; |
1021 | struct trace_uprobe *tu; | |
1022 | u8 *data; | |
f3f096cf | 1023 | |
457d1772 | 1024 | entry = (struct uprobe_trace_entry_head *)iter->ent; |
60d53e2c MH |
1025 | tu = trace_uprobe_primary_from_call( |
1026 | container_of(event, struct trace_event_call, event)); | |
1027 | if (unlikely(!tu)) | |
1028 | goto out; | |
f3f096cf | 1029 | |
3ede82dd | 1030 | if (is_ret_probe(tu)) { |
8579a107 | 1031 | trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)", |
b55ce203 | 1032 | trace_probe_name(&tu->tp), |
8579a107 | 1033 | entry->vaddr[1], entry->vaddr[0]); |
3ede82dd ON |
1034 | data = DATAOF_TRACE_ENTRY(entry, true); |
1035 | } else { | |
8579a107 | 1036 | trace_seq_printf(s, "%s: (0x%lx)", |
b55ce203 | 1037 | trace_probe_name(&tu->tp), |
8579a107 | 1038 | entry->vaddr[0]); |
3ede82dd ON |
1039 | data = DATAOF_TRACE_ENTRY(entry, false); |
1040 | } | |
f3f096cf | 1041 | |
196b6389 | 1042 | if (trace_probe_print_args(s, tu->tp.args, tu->tp.nr_args, data, entry) < 0) |
56de7630 | 1043 | goto out; |
f3f096cf | 1044 | |
8579a107 | 1045 | trace_seq_putc(s, '\n'); |
f3f096cf | 1046 | |
8579a107 SRRH |
1047 | out: |
1048 | return trace_handle_return(s); | |
f3f096cf SD |
1049 | } |
1050 | ||
31ba3348 ON |
1051 | typedef bool (*filter_func_t)(struct uprobe_consumer *self, |
1052 | enum uprobe_filter_ctx ctx, | |
1053 | struct mm_struct *mm); | |
1054 | ||
60d53e2c | 1055 | static int trace_uprobe_enable(struct trace_uprobe *tu, filter_func_t filter) |
f3f096cf | 1056 | { |
70ed91c6 J |
1057 | int ret; |
1058 | ||
60d53e2c MH |
1059 | tu->consumer.filter = filter; |
1060 | tu->inode = d_real_inode(tu->path.dentry); | |
1061 | ||
1062 | if (tu->ref_ctr_offset) | |
1063 | ret = uprobe_register_refctr(tu->inode, tu->offset, | |
1064 | tu->ref_ctr_offset, &tu->consumer); | |
1065 | else | |
1066 | ret = uprobe_register(tu->inode, tu->offset, &tu->consumer); | |
1067 | ||
1068 | if (ret) | |
1069 | tu->inode = NULL; | |
1070 | ||
1071 | return ret; | |
1072 | } | |
1073 | ||
1074 | static void __probe_event_disable(struct trace_probe *tp) | |
1075 | { | |
60d53e2c MH |
1076 | struct trace_uprobe *tu; |
1077 | ||
99c9a923 | 1078 | tu = container_of(tp, struct trace_uprobe, tp); |
b61387cb | 1079 | WARN_ON(!uprobe_filter_is_empty(tu->tp.event->filter)); |
99c9a923 | 1080 | |
e161c6bf | 1081 | list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) { |
60d53e2c MH |
1082 | if (!tu->inode) |
1083 | continue; | |
1084 | ||
60d53e2c MH |
1085 | uprobe_unregister(tu->inode, tu->offset, &tu->consumer); |
1086 | tu->inode = NULL; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | static int probe_event_enable(struct trace_event_call *call, | |
1091 | struct trace_event_file *file, filter_func_t filter) | |
1092 | { | |
e161c6bf | 1093 | struct trace_probe *tp; |
60d53e2c MH |
1094 | struct trace_uprobe *tu; |
1095 | bool enabled; | |
1096 | int ret; | |
1097 | ||
1098 | tp = trace_probe_primary_from_call(call); | |
1099 | if (WARN_ON_ONCE(!tp)) | |
1100 | return -ENODEV; | |
1101 | enabled = trace_probe_is_enabled(tp); | |
1102 | ||
1103 | /* This may also change "enabled" state */ | |
70ed91c6 | 1104 | if (file) { |
60d53e2c | 1105 | if (trace_probe_test_flag(tp, TP_FLAG_PROFILE)) |
48212542 ON |
1106 | return -EINTR; |
1107 | ||
60d53e2c | 1108 | ret = trace_probe_add_file(tp, file); |
b5f935ee MH |
1109 | if (ret < 0) |
1110 | return ret; | |
48212542 | 1111 | } else { |
60d53e2c | 1112 | if (trace_probe_test_flag(tp, TP_FLAG_TRACE)) |
48212542 ON |
1113 | return -EINTR; |
1114 | ||
60d53e2c | 1115 | trace_probe_set_flag(tp, TP_FLAG_PROFILE); |
48212542 | 1116 | } |
f3f096cf | 1117 | |
60d53e2c | 1118 | tu = container_of(tp, struct trace_uprobe, tp); |
b61387cb | 1119 | WARN_ON(!uprobe_filter_is_empty(tu->tp.event->filter)); |
736288ba | 1120 | |
70ed91c6 J |
1121 | if (enabled) |
1122 | return 0; | |
1123 | ||
fb6bab6a ON |
1124 | ret = uprobe_buffer_enable(); |
1125 | if (ret) | |
1126 | goto err_flags; | |
1127 | ||
e161c6bf | 1128 | list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) { |
60d53e2c MH |
1129 | ret = trace_uprobe_enable(tu, filter); |
1130 | if (ret) { | |
1131 | __probe_event_disable(tp); | |
1132 | goto err_buffer; | |
1133 | } | |
1cc33161 RB |
1134 | } |
1135 | ||
fb6bab6a ON |
1136 | return 0; |
1137 | ||
1138 | err_buffer: | |
1139 | uprobe_buffer_disable(); | |
f3f096cf | 1140 | |
fb6bab6a | 1141 | err_flags: |
b5f935ee | 1142 | if (file) |
60d53e2c | 1143 | trace_probe_remove_file(tp, file); |
b5f935ee | 1144 | else |
60d53e2c | 1145 | trace_probe_clear_flag(tp, TP_FLAG_PROFILE); |
b5f935ee | 1146 | |
4161824f | 1147 | return ret; |
f3f096cf SD |
1148 | } |
1149 | ||
60d53e2c MH |
1150 | static void probe_event_disable(struct trace_event_call *call, |
1151 | struct trace_event_file *file) | |
f3f096cf | 1152 | { |
60d53e2c MH |
1153 | struct trace_probe *tp; |
1154 | ||
1155 | tp = trace_probe_primary_from_call(call); | |
1156 | if (WARN_ON_ONCE(!tp)) | |
1157 | return; | |
1158 | ||
1159 | if (!trace_probe_is_enabled(tp)) | |
f3f096cf SD |
1160 | return; |
1161 | ||
70ed91c6 | 1162 | if (file) { |
60d53e2c | 1163 | if (trace_probe_remove_file(tp, file) < 0) |
70ed91c6 J |
1164 | return; |
1165 | ||
60d53e2c | 1166 | if (trace_probe_is_enabled(tp)) |
70ed91c6 | 1167 | return; |
b5f935ee | 1168 | } else |
60d53e2c | 1169 | trace_probe_clear_flag(tp, TP_FLAG_PROFILE); |
dcad1a20 | 1170 | |
60d53e2c | 1171 | __probe_event_disable(tp); |
dcad1a20 | 1172 | uprobe_buffer_disable(); |
f3f096cf SD |
1173 | } |
1174 | ||
2425bcb9 | 1175 | static int uprobe_event_define_fields(struct trace_event_call *event_call) |
f3f096cf | 1176 | { |
eeb07b06 | 1177 | int ret, size; |
f3f096cf | 1178 | struct uprobe_trace_entry_head field; |
60d53e2c MH |
1179 | struct trace_uprobe *tu; |
1180 | ||
1181 | tu = trace_uprobe_primary_from_call(event_call); | |
1182 | if (unlikely(!tu)) | |
1183 | return -ENODEV; | |
f3f096cf | 1184 | |
4d1298e2 ON |
1185 | if (is_ret_probe(tu)) { |
1186 | DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_FUNC, 0); | |
1187 | DEFINE_FIELD(unsigned long, vaddr[1], FIELD_STRING_RETIP, 0); | |
1188 | size = SIZEOF_TRACE_ENTRY(true); | |
1189 | } else { | |
1190 | DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_IP, 0); | |
1191 | size = SIZEOF_TRACE_ENTRY(false); | |
1192 | } | |
f3f096cf | 1193 | |
eeb07b06 | 1194 | return traceprobe_define_arg_fields(event_call, size, &tu->tp); |
f3f096cf SD |
1195 | } |
1196 | ||
f3f096cf | 1197 | #ifdef CONFIG_PERF_EVENTS |
31ba3348 ON |
1198 | static bool |
1199 | __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm) | |
1200 | { | |
1201 | struct perf_event *event; | |
1202 | ||
1203 | if (filter->nr_systemwide) | |
1204 | return true; | |
1205 | ||
1206 | list_for_each_entry(event, &filter->perf_events, hw.tp_list) { | |
50f16a8b | 1207 | if (event->hw.target->mm == mm) |
31ba3348 ON |
1208 | return true; |
1209 | } | |
1210 | ||
1211 | return false; | |
1212 | } | |
1213 | ||
b2fe8ba6 | 1214 | static inline bool |
99c9a923 MH |
1215 | trace_uprobe_filter_event(struct trace_uprobe_filter *filter, |
1216 | struct perf_event *event) | |
b2fe8ba6 | 1217 | { |
99c9a923 | 1218 | return __uprobe_perf_filter(filter, event->hw.target->mm); |
b2fe8ba6 ON |
1219 | } |
1220 | ||
99c9a923 MH |
1221 | static bool trace_uprobe_filter_remove(struct trace_uprobe_filter *filter, |
1222 | struct perf_event *event) | |
736288ba | 1223 | { |
b2fe8ba6 ON |
1224 | bool done; |
1225 | ||
99c9a923 | 1226 | write_lock(&filter->rwlock); |
50f16a8b | 1227 | if (event->hw.target) { |
ce5f36a5 | 1228 | list_del(&event->hw.tp_list); |
99c9a923 | 1229 | done = filter->nr_systemwide || |
50f16a8b | 1230 | (event->hw.target->flags & PF_EXITING) || |
99c9a923 | 1231 | trace_uprobe_filter_event(filter, event); |
b2fe8ba6 | 1232 | } else { |
99c9a923 MH |
1233 | filter->nr_systemwide--; |
1234 | done = filter->nr_systemwide; | |
b2fe8ba6 | 1235 | } |
99c9a923 | 1236 | write_unlock(&filter->rwlock); |
31ba3348 | 1237 | |
99c9a923 | 1238 | return done; |
736288ba ON |
1239 | } |
1240 | ||
99c9a923 MH |
1241 | /* This returns true if the filter always covers target mm */ |
1242 | static bool trace_uprobe_filter_add(struct trace_uprobe_filter *filter, | |
1243 | struct perf_event *event) | |
736288ba | 1244 | { |
b2fe8ba6 ON |
1245 | bool done; |
1246 | ||
99c9a923 | 1247 | write_lock(&filter->rwlock); |
50f16a8b | 1248 | if (event->hw.target) { |
ce5f36a5 ON |
1249 | /* |
1250 | * event->parent != NULL means copy_process(), we can avoid | |
1251 | * uprobe_apply(). current->mm must be probed and we can rely | |
1252 | * on dup_mmap() which preserves the already installed bp's. | |
1253 | * | |
1254 | * attr.enable_on_exec means that exec/mmap will install the | |
1255 | * breakpoints we need. | |
1256 | */ | |
99c9a923 | 1257 | done = filter->nr_systemwide || |
ce5f36a5 | 1258 | event->parent || event->attr.enable_on_exec || |
99c9a923 MH |
1259 | trace_uprobe_filter_event(filter, event); |
1260 | list_add(&event->hw.tp_list, &filter->perf_events); | |
b2fe8ba6 | 1261 | } else { |
99c9a923 MH |
1262 | done = filter->nr_systemwide; |
1263 | filter->nr_systemwide++; | |
b2fe8ba6 | 1264 | } |
99c9a923 | 1265 | write_unlock(&filter->rwlock); |
736288ba | 1266 | |
99c9a923 | 1267 | return done; |
736288ba ON |
1268 | } |
1269 | ||
99c9a923 MH |
1270 | static int uprobe_perf_close(struct trace_event_call *call, |
1271 | struct perf_event *event) | |
60d53e2c | 1272 | { |
e161c6bf | 1273 | struct trace_probe *tp; |
60d53e2c MH |
1274 | struct trace_uprobe *tu; |
1275 | int ret = 0; | |
1276 | ||
1277 | tp = trace_probe_primary_from_call(call); | |
1278 | if (WARN_ON_ONCE(!tp)) | |
1279 | return -ENODEV; | |
1280 | ||
99c9a923 | 1281 | tu = container_of(tp, struct trace_uprobe, tp); |
b61387cb | 1282 | if (trace_uprobe_filter_remove(tu->tp.event->filter, event)) |
99c9a923 MH |
1283 | return 0; |
1284 | ||
e161c6bf | 1285 | list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) { |
99c9a923 | 1286 | ret = uprobe_apply(tu->inode, tu->offset, &tu->consumer, false); |
60d53e2c MH |
1287 | if (ret) |
1288 | break; | |
1289 | } | |
1290 | ||
1291 | return ret; | |
1292 | } | |
99c9a923 MH |
1293 | |
1294 | static int uprobe_perf_open(struct trace_event_call *call, | |
1295 | struct perf_event *event) | |
1296 | { | |
e161c6bf | 1297 | struct trace_probe *tp; |
99c9a923 MH |
1298 | struct trace_uprobe *tu; |
1299 | int err = 0; | |
1300 | ||
1301 | tp = trace_probe_primary_from_call(call); | |
1302 | if (WARN_ON_ONCE(!tp)) | |
1303 | return -ENODEV; | |
1304 | ||
1305 | tu = container_of(tp, struct trace_uprobe, tp); | |
b61387cb | 1306 | if (trace_uprobe_filter_add(tu->tp.event->filter, event)) |
99c9a923 MH |
1307 | return 0; |
1308 | ||
e161c6bf | 1309 | list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) { |
99c9a923 MH |
1310 | err = uprobe_apply(tu->inode, tu->offset, &tu->consumer, true); |
1311 | if (err) { | |
1312 | uprobe_perf_close(call, event); | |
1313 | break; | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | return err; | |
1318 | } | |
1319 | ||
31ba3348 ON |
1320 | static bool uprobe_perf_filter(struct uprobe_consumer *uc, |
1321 | enum uprobe_filter_ctx ctx, struct mm_struct *mm) | |
1322 | { | |
99c9a923 | 1323 | struct trace_uprobe_filter *filter; |
31ba3348 ON |
1324 | struct trace_uprobe *tu; |
1325 | int ret; | |
1326 | ||
1327 | tu = container_of(uc, struct trace_uprobe, consumer); | |
b61387cb | 1328 | filter = tu->tp.event->filter; |
99c9a923 MH |
1329 | |
1330 | read_lock(&filter->rwlock); | |
1331 | ret = __uprobe_perf_filter(filter, mm); | |
1332 | read_unlock(&filter->rwlock); | |
31ba3348 ON |
1333 | |
1334 | return ret; | |
1335 | } | |
1336 | ||
a43b9704 | 1337 | static void __uprobe_perf_func(struct trace_uprobe *tu, |
dd9fa555 NK |
1338 | unsigned long func, struct pt_regs *regs, |
1339 | struct uprobe_cpu_buffer *ucb, int dsize) | |
f3f096cf | 1340 | { |
e3dc9f89 | 1341 | struct trace_event_call *call = trace_probe_event_call(&tu->tp); |
f3f096cf SD |
1342 | struct uprobe_trace_entry_head *entry; |
1343 | struct hlist_head *head; | |
457d1772 | 1344 | void *data; |
dd9fa555 | 1345 | int size, esize; |
dcad1a20 NK |
1346 | int rctx; |
1347 | ||
aca80dd9 | 1348 | #ifdef CONFIG_BPF_EVENTS |
70ed0706 AS |
1349 | if (bpf_prog_array_valid(call)) { |
1350 | u32 ret; | |
1351 | ||
8c7dcb84 | 1352 | ret = bpf_prog_run_array_sleepable(call->prog_array, regs, bpf_prog_run); |
70ed0706 AS |
1353 | if (!ret) |
1354 | return; | |
1355 | } | |
aca80dd9 | 1356 | #endif /* CONFIG_BPF_EVENTS */ |
04a22fae | 1357 | |
dcad1a20 | 1358 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); |
f3f096cf | 1359 | |
dcad1a20 NK |
1360 | size = esize + tu->tp.size + dsize; |
1361 | size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32); | |
1362 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough")) | |
1363 | return; | |
1364 | ||
f3f096cf | 1365 | preempt_disable(); |
515619f2 ON |
1366 | head = this_cpu_ptr(call->perf_events); |
1367 | if (hlist_empty(head)) | |
1368 | goto out; | |
1369 | ||
1e1dcd93 | 1370 | entry = perf_trace_buf_alloc(size, NULL, &rctx); |
f3f096cf SD |
1371 | if (!entry) |
1372 | goto out; | |
1373 | ||
393a736c ON |
1374 | if (is_ret_probe(tu)) { |
1375 | entry->vaddr[0] = func; | |
32520b2c | 1376 | entry->vaddr[1] = instruction_pointer(regs); |
393a736c ON |
1377 | data = DATAOF_TRACE_ENTRY(entry, true); |
1378 | } else { | |
32520b2c | 1379 | entry->vaddr[0] = instruction_pointer(regs); |
393a736c ON |
1380 | data = DATAOF_TRACE_ENTRY(entry, false); |
1381 | } | |
1382 | ||
dcad1a20 NK |
1383 | memcpy(data, ucb->buf, tu->tp.size + dsize); |
1384 | ||
1385 | if (size - esize > tu->tp.size + dsize) { | |
1386 | int len = tu->tp.size + dsize; | |
14577c39 | 1387 | |
dcad1a20 | 1388 | memset(data + len, 0, size - esize - len); |
14577c39 | 1389 | } |
f3f096cf | 1390 | |
1e1dcd93 | 1391 | perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, |
8fd0fbbe | 1392 | head, NULL); |
f3f096cf SD |
1393 | out: |
1394 | preempt_enable(); | |
a51cc604 ON |
1395 | } |
1396 | ||
1397 | /* uprobe profile handler */ | |
dd9fa555 NK |
1398 | static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs, |
1399 | struct uprobe_cpu_buffer *ucb, int dsize) | |
a51cc604 ON |
1400 | { |
1401 | if (!uprobe_perf_filter(&tu->consumer, 0, current->mm)) | |
1402 | return UPROBE_HANDLER_REMOVE; | |
1403 | ||
393a736c | 1404 | if (!is_ret_probe(tu)) |
dd9fa555 | 1405 | __uprobe_perf_func(tu, 0, regs, ucb, dsize); |
f42d24a1 | 1406 | return 0; |
f3f096cf | 1407 | } |
c1ae5c75 ON |
1408 | |
1409 | static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func, | |
dd9fa555 NK |
1410 | struct pt_regs *regs, |
1411 | struct uprobe_cpu_buffer *ucb, int dsize) | |
c1ae5c75 | 1412 | { |
dd9fa555 | 1413 | __uprobe_perf_func(tu, func, regs, ucb, dsize); |
c1ae5c75 | 1414 | } |
41bdc4b4 YS |
1415 | |
1416 | int bpf_get_uprobe_info(const struct perf_event *event, u32 *fd_type, | |
1417 | const char **filename, u64 *probe_offset, | |
1418 | bool perf_type_tracepoint) | |
1419 | { | |
1420 | const char *pevent = trace_event_name(event->tp_event); | |
1421 | const char *group = event->tp_event->class->system; | |
1422 | struct trace_uprobe *tu; | |
1423 | ||
1424 | if (perf_type_tracepoint) | |
1425 | tu = find_probe_event(pevent, group); | |
1426 | else | |
22d5bd68 | 1427 | tu = trace_uprobe_primary_from_call(event->tp_event); |
41bdc4b4 YS |
1428 | if (!tu) |
1429 | return -EINVAL; | |
1430 | ||
1431 | *fd_type = is_ret_probe(tu) ? BPF_FD_TYPE_URETPROBE | |
1432 | : BPF_FD_TYPE_UPROBE; | |
1433 | *filename = tu->filename; | |
1434 | *probe_offset = tu->offset; | |
1435 | return 0; | |
1436 | } | |
f3f096cf SD |
1437 | #endif /* CONFIG_PERF_EVENTS */ |
1438 | ||
70ed91c6 | 1439 | static int |
2425bcb9 | 1440 | trace_uprobe_register(struct trace_event_call *event, enum trace_reg type, |
70ed91c6 | 1441 | void *data) |
f3f096cf | 1442 | { |
7f1d2f82 | 1443 | struct trace_event_file *file = data; |
f3f096cf SD |
1444 | |
1445 | switch (type) { | |
1446 | case TRACE_REG_REGISTER: | |
60d53e2c | 1447 | return probe_event_enable(event, file, NULL); |
f3f096cf SD |
1448 | |
1449 | case TRACE_REG_UNREGISTER: | |
60d53e2c | 1450 | probe_event_disable(event, file); |
f3f096cf SD |
1451 | return 0; |
1452 | ||
1453 | #ifdef CONFIG_PERF_EVENTS | |
1454 | case TRACE_REG_PERF_REGISTER: | |
60d53e2c | 1455 | return probe_event_enable(event, NULL, uprobe_perf_filter); |
f3f096cf SD |
1456 | |
1457 | case TRACE_REG_PERF_UNREGISTER: | |
60d53e2c | 1458 | probe_event_disable(event, NULL); |
f3f096cf | 1459 | return 0; |
736288ba ON |
1460 | |
1461 | case TRACE_REG_PERF_OPEN: | |
99c9a923 | 1462 | return uprobe_perf_open(event, data); |
736288ba ON |
1463 | |
1464 | case TRACE_REG_PERF_CLOSE: | |
99c9a923 | 1465 | return uprobe_perf_close(event, data); |
736288ba | 1466 | |
f3f096cf SD |
1467 | #endif |
1468 | default: | |
1469 | return 0; | |
1470 | } | |
f3f096cf SD |
1471 | } |
1472 | ||
1473 | static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs) | |
1474 | { | |
f3f096cf | 1475 | struct trace_uprobe *tu; |
b7e0bf34 | 1476 | struct uprobe_dispatch_data udd; |
dd9fa555 NK |
1477 | struct uprobe_cpu_buffer *ucb; |
1478 | int dsize, esize; | |
f42d24a1 | 1479 | int ret = 0; |
f3f096cf | 1480 | |
dd9fa555 | 1481 | |
a932b738 | 1482 | tu = container_of(con, struct trace_uprobe, consumer); |
1b47aefd | 1483 | tu->nhit++; |
f3f096cf | 1484 | |
b7e0bf34 NK |
1485 | udd.tu = tu; |
1486 | udd.bp_addr = instruction_pointer(regs); | |
1487 | ||
1488 | current->utask->vaddr = (unsigned long) &udd; | |
1489 | ||
dd9fa555 NK |
1490 | if (WARN_ON_ONCE(!uprobe_cpu_buffer)) |
1491 | return 0; | |
1492 | ||
1493 | dsize = __get_data_size(&tu->tp, regs); | |
1494 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); | |
1495 | ||
1496 | ucb = uprobe_buffer_get(); | |
9178412d | 1497 | store_trace_args(ucb->buf, &tu->tp, regs, esize, dsize); |
dd9fa555 | 1498 | |
747774d6 | 1499 | if (trace_probe_test_flag(&tu->tp, TP_FLAG_TRACE)) |
dd9fa555 | 1500 | ret |= uprobe_trace_func(tu, regs, ucb, dsize); |
f3f096cf SD |
1501 | |
1502 | #ifdef CONFIG_PERF_EVENTS | |
747774d6 | 1503 | if (trace_probe_test_flag(&tu->tp, TP_FLAG_PROFILE)) |
dd9fa555 | 1504 | ret |= uprobe_perf_func(tu, regs, ucb, dsize); |
f3f096cf | 1505 | #endif |
dd9fa555 | 1506 | uprobe_buffer_put(ucb); |
f42d24a1 | 1507 | return ret; |
f3f096cf SD |
1508 | } |
1509 | ||
c1ae5c75 ON |
1510 | static int uretprobe_dispatcher(struct uprobe_consumer *con, |
1511 | unsigned long func, struct pt_regs *regs) | |
1512 | { | |
1513 | struct trace_uprobe *tu; | |
b7e0bf34 | 1514 | struct uprobe_dispatch_data udd; |
dd9fa555 NK |
1515 | struct uprobe_cpu_buffer *ucb; |
1516 | int dsize, esize; | |
c1ae5c75 ON |
1517 | |
1518 | tu = container_of(con, struct trace_uprobe, consumer); | |
1519 | ||
b7e0bf34 NK |
1520 | udd.tu = tu; |
1521 | udd.bp_addr = func; | |
1522 | ||
1523 | current->utask->vaddr = (unsigned long) &udd; | |
1524 | ||
dd9fa555 NK |
1525 | if (WARN_ON_ONCE(!uprobe_cpu_buffer)) |
1526 | return 0; | |
1527 | ||
1528 | dsize = __get_data_size(&tu->tp, regs); | |
1529 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); | |
1530 | ||
1531 | ucb = uprobe_buffer_get(); | |
9178412d | 1532 | store_trace_args(ucb->buf, &tu->tp, regs, esize, dsize); |
dd9fa555 | 1533 | |
747774d6 | 1534 | if (trace_probe_test_flag(&tu->tp, TP_FLAG_TRACE)) |
dd9fa555 | 1535 | uretprobe_trace_func(tu, func, regs, ucb, dsize); |
c1ae5c75 ON |
1536 | |
1537 | #ifdef CONFIG_PERF_EVENTS | |
747774d6 | 1538 | if (trace_probe_test_flag(&tu->tp, TP_FLAG_PROFILE)) |
dd9fa555 | 1539 | uretprobe_perf_func(tu, func, regs, ucb, dsize); |
c1ae5c75 | 1540 | #endif |
dd9fa555 | 1541 | uprobe_buffer_put(ucb); |
c1ae5c75 ON |
1542 | return 0; |
1543 | } | |
1544 | ||
f3f096cf SD |
1545 | static struct trace_event_functions uprobe_funcs = { |
1546 | .trace = print_uprobe_event | |
1547 | }; | |
1548 | ||
04ae87a5 PZ |
1549 | static struct trace_event_fields uprobe_fields_array[] = { |
1550 | { .type = TRACE_FUNCTION_TYPE, | |
1551 | .define_fields = uprobe_event_define_fields }, | |
1552 | {} | |
1553 | }; | |
1554 | ||
e3dc9f89 | 1555 | static inline void init_trace_event_call(struct trace_uprobe *tu) |
f3f096cf | 1556 | { |
e3dc9f89 | 1557 | struct trace_event_call *call = trace_probe_event_call(&tu->tp); |
f3f096cf | 1558 | call->event.funcs = &uprobe_funcs; |
04ae87a5 | 1559 | call->class->fields_array = uprobe_fields_array; |
f3f096cf | 1560 | |
9fd2e48b | 1561 | call->flags = TRACE_EVENT_FL_UPROBE | TRACE_EVENT_FL_CAP_ANY; |
33ea4b24 | 1562 | call->class->reg = trace_uprobe_register; |
33ea4b24 SL |
1563 | } |
1564 | ||
1565 | static int register_uprobe_event(struct trace_uprobe *tu) | |
1566 | { | |
e3dc9f89 | 1567 | init_trace_event_call(tu); |
f3f096cf | 1568 | |
46e5376d | 1569 | return trace_probe_register_event_call(&tu->tp); |
f3f096cf SD |
1570 | } |
1571 | ||
c6c2401d | 1572 | static int unregister_uprobe_event(struct trace_uprobe *tu) |
f3f096cf | 1573 | { |
46e5376d | 1574 | return trace_probe_unregister_event_call(&tu->tp); |
f3f096cf SD |
1575 | } |
1576 | ||
33ea4b24 SL |
1577 | #ifdef CONFIG_PERF_EVENTS |
1578 | struct trace_event_call * | |
a6ca88b2 SL |
1579 | create_local_trace_uprobe(char *name, unsigned long offs, |
1580 | unsigned long ref_ctr_offset, bool is_return) | |
33ea4b24 | 1581 | { |
007517a0 | 1582 | enum probe_print_type ptype; |
33ea4b24 | 1583 | struct trace_uprobe *tu; |
33ea4b24 SL |
1584 | struct path path; |
1585 | int ret; | |
1586 | ||
1587 | ret = kern_path(name, LOOKUP_FOLLOW, &path); | |
1588 | if (ret) | |
1589 | return ERR_PTR(ret); | |
1590 | ||
0c92c7a3 SL |
1591 | if (!d_is_reg(path.dentry)) { |
1592 | path_put(&path); | |
33ea4b24 SL |
1593 | return ERR_PTR(-EINVAL); |
1594 | } | |
1595 | ||
1596 | /* | |
0597c49c | 1597 | * local trace_kprobes are not added to dyn_event, so they are never |
33ea4b24 SL |
1598 | * searched in find_trace_kprobe(). Therefore, there is no concern of |
1599 | * duplicated name "DUMMY_EVENT" here. | |
1600 | */ | |
1601 | tu = alloc_trace_uprobe(UPROBE_EVENT_SYSTEM, "DUMMY_EVENT", 0, | |
1602 | is_return); | |
1603 | ||
1604 | if (IS_ERR(tu)) { | |
1605 | pr_info("Failed to allocate trace_uprobe.(%d)\n", | |
1606 | (int)PTR_ERR(tu)); | |
0c92c7a3 | 1607 | path_put(&path); |
33ea4b24 SL |
1608 | return ERR_CAST(tu); |
1609 | } | |
1610 | ||
1611 | tu->offset = offs; | |
0c92c7a3 | 1612 | tu->path = path; |
a6ca88b2 | 1613 | tu->ref_ctr_offset = ref_ctr_offset; |
33ea4b24 | 1614 | tu->filename = kstrdup(name, GFP_KERNEL); |
8c722424 XW |
1615 | if (!tu->filename) { |
1616 | ret = -ENOMEM; | |
1617 | goto error; | |
1618 | } | |
1619 | ||
e3dc9f89 | 1620 | init_trace_event_call(tu); |
33ea4b24 | 1621 | |
007517a0 SRV |
1622 | ptype = is_ret_probe(tu) ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL; |
1623 | if (traceprobe_set_print_fmt(&tu->tp, ptype) < 0) { | |
33ea4b24 SL |
1624 | ret = -ENOMEM; |
1625 | goto error; | |
1626 | } | |
1627 | ||
e3dc9f89 | 1628 | return trace_probe_event_call(&tu->tp); |
33ea4b24 SL |
1629 | error: |
1630 | free_trace_uprobe(tu); | |
1631 | return ERR_PTR(ret); | |
1632 | } | |
1633 | ||
1634 | void destroy_local_trace_uprobe(struct trace_event_call *event_call) | |
1635 | { | |
1636 | struct trace_uprobe *tu; | |
1637 | ||
60d53e2c | 1638 | tu = trace_uprobe_primary_from_call(event_call); |
33ea4b24 | 1639 | |
33ea4b24 SL |
1640 | free_trace_uprobe(tu); |
1641 | } | |
1642 | #endif /* CONFIG_PERF_EVENTS */ | |
1643 | ||
39bcdd6a | 1644 | /* Make a trace interface for controlling probe points */ |
f3f096cf SD |
1645 | static __init int init_uprobe_trace(void) |
1646 | { | |
0597c49c MH |
1647 | int ret; |
1648 | ||
1649 | ret = dyn_event_register(&trace_uprobe_ops); | |
1650 | if (ret) | |
1651 | return ret; | |
f3f096cf | 1652 | |
22c36b18 WY |
1653 | ret = tracing_init_dentry(); |
1654 | if (ret) | |
f3f096cf SD |
1655 | return 0; |
1656 | ||
21ccc9cd | 1657 | trace_create_file("uprobe_events", TRACE_MODE_WRITE, NULL, |
f3f096cf SD |
1658 | NULL, &uprobe_events_ops); |
1659 | /* Profile interface */ | |
21ccc9cd | 1660 | trace_create_file("uprobe_profile", TRACE_MODE_READ, NULL, |
f3f096cf SD |
1661 | NULL, &uprobe_profile_ops); |
1662 | return 0; | |
1663 | } | |
1664 | ||
1665 | fs_initcall(init_uprobe_trace); |