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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f71d20e9 | 2 | /* |
1da177e4 | 3 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 4 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 | 5 | |
1da177e4 | 6 | */ |
9984de1a | 7 | #include <linux/export.h> |
8a293be0 | 8 | #include <linux/extable.h> |
1da177e4 | 9 | #include <linux/moduleloader.h> |
af658dca | 10 | #include <linux/trace_events.h> |
1da177e4 | 11 | #include <linux/init.h> |
ae84e324 | 12 | #include <linux/kallsyms.h> |
34e1169d | 13 | #include <linux/file.h> |
3b5d5c6b | 14 | #include <linux/fs.h> |
6d760133 | 15 | #include <linux/sysfs.h> |
9f158333 | 16 | #include <linux/kernel.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/elf.h> | |
3b5d5c6b | 20 | #include <linux/proc_fs.h> |
2e72d51b | 21 | #include <linux/security.h> |
1da177e4 LT |
22 | #include <linux/seq_file.h> |
23 | #include <linux/syscalls.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/rcupdate.h> | |
c59ede7b | 26 | #include <linux/capability.h> |
1da177e4 LT |
27 | #include <linux/cpu.h> |
28 | #include <linux/moduleparam.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/vermagic.h> | |
32 | #include <linux/notifier.h> | |
f6a57033 | 33 | #include <linux/sched.h> |
1da177e4 | 34 | #include <linux/device.h> |
c988d2b2 | 35 | #include <linux/string.h> |
97d1f15b | 36 | #include <linux/mutex.h> |
d72b3751 | 37 | #include <linux/rculist.h> |
7c0f6ba6 | 38 | #include <linux/uaccess.h> |
1da177e4 | 39 | #include <asm/cacheflush.h> |
563ec5cb | 40 | #include <linux/set_memory.h> |
eb8cdec4 | 41 | #include <asm/mmu_context.h> |
b817f6fe | 42 | #include <linux/license.h> |
6d762394 | 43 | #include <asm/sections.h> |
97e1c18e | 44 | #include <linux/tracepoint.h> |
90d595fe | 45 | #include <linux/ftrace.h> |
7e545d6e | 46 | #include <linux/livepatch.h> |
22a9d645 | 47 | #include <linux/async.h> |
fbf59bc9 | 48 | #include <linux/percpu.h> |
4f2294b6 | 49 | #include <linux/kmemleak.h> |
bf5438fc | 50 | #include <linux/jump_label.h> |
84e1c6bb | 51 | #include <linux/pfn.h> |
403ed278 | 52 | #include <linux/bsearch.h> |
9d5059c9 | 53 | #include <linux/dynamic_debug.h> |
ca86cad7 | 54 | #include <linux/audit.h> |
2f3238ae | 55 | #include <uapi/linux/module.h> |
106a4ee2 | 56 | #include "module-internal.h" |
1da177e4 | 57 | |
7ead8b83 LZ |
58 | #define CREATE_TRACE_POINTS |
59 | #include <trace/events/module.h> | |
60 | ||
1da177e4 LT |
61 | #ifndef ARCH_SHF_SMALL |
62 | #define ARCH_SHF_SMALL 0 | |
63 | #endif | |
64 | ||
84e1c6bb | 65 | /* |
66 | * Modules' sections will be aligned on page boundaries | |
3b5be16c HZ |
67 | * to ensure complete separation of code and data, but |
68 | * only when CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y | |
84e1c6bb | 69 | */ |
3b5be16c | 70 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb | 71 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
3b5be16c HZ |
72 | #else |
73 | # define debug_align(X) (X) | |
74 | #endif | |
84e1c6bb | 75 | |
1da177e4 LT |
76 | /* If this is set, the section belongs in the init part of the module */ |
77 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
78 | ||
75676500 RR |
79 | /* |
80 | * Mutex protects: | |
81 | * 1) List of modules (also safely readable with preempt_disable), | |
82 | * 2) module_use links, | |
83 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 84 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
85 | DEFINE_MUTEX(module_mutex); |
86 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 87 | static LIST_HEAD(modules); |
67fc4e0c | 88 | |
1a7b7d92 RE |
89 | /* Work queue for freeing init sections in success case */ |
90 | static struct work_struct init_free_wq; | |
91 | static struct llist_head init_free_list; | |
92 | ||
6c9692e2 | 93 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 94 | |
93c2e105 PZ |
95 | /* |
96 | * Use a latched RB-tree for __module_address(); this allows us to use | |
97 | * RCU-sched lookups of the address from any context. | |
98 | * | |
6c9692e2 PZ |
99 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
100 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
101 | * NMI context. | |
93c2e105 PZ |
102 | */ |
103 | ||
104 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 105 | { |
7523e4dc | 106 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 107 | |
7523e4dc | 108 | return (unsigned long)layout->base; |
93c2e105 PZ |
109 | } |
110 | ||
111 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
112 | { | |
7523e4dc | 113 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 114 | |
7523e4dc | 115 | return (unsigned long)layout->size; |
93c2e105 PZ |
116 | } |
117 | ||
118 | static __always_inline bool | |
119 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
120 | { | |
121 | return __mod_tree_val(a) < __mod_tree_val(b); | |
122 | } | |
123 | ||
124 | static __always_inline int | |
125 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
126 | { | |
127 | unsigned long val = (unsigned long)key; | |
128 | unsigned long start, end; | |
129 | ||
130 | start = __mod_tree_val(n); | |
131 | if (val < start) | |
132 | return -1; | |
133 | ||
134 | end = start + __mod_tree_size(n); | |
135 | if (val >= end) | |
136 | return 1; | |
106a4ee2 | 137 | |
106a4ee2 RR |
138 | return 0; |
139 | } | |
140 | ||
93c2e105 PZ |
141 | static const struct latch_tree_ops mod_tree_ops = { |
142 | .less = mod_tree_less, | |
143 | .comp = mod_tree_comp, | |
144 | }; | |
145 | ||
4f666546 PZ |
146 | static struct mod_tree_root { |
147 | struct latch_tree_root root; | |
148 | unsigned long addr_min; | |
149 | unsigned long addr_max; | |
150 | } mod_tree __cacheline_aligned = { | |
151 | .addr_min = -1UL, | |
106a4ee2 | 152 | }; |
106a4ee2 | 153 | |
4f666546 PZ |
154 | #define module_addr_min mod_tree.addr_min |
155 | #define module_addr_max mod_tree.addr_max | |
156 | ||
157 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
158 | { | |
159 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
160 | } | |
161 | ||
162 | static void __mod_tree_remove(struct mod_tree_node *node) | |
163 | { | |
164 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
165 | } | |
93c2e105 PZ |
166 | |
167 | /* | |
168 | * These modifications: insert, remove_init and remove; are serialized by the | |
169 | * module_mutex. | |
170 | */ | |
171 | static void mod_tree_insert(struct module *mod) | |
172 | { | |
7523e4dc RR |
173 | mod->core_layout.mtn.mod = mod; |
174 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 175 | |
7523e4dc RR |
176 | __mod_tree_insert(&mod->core_layout.mtn); |
177 | if (mod->init_layout.size) | |
178 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
179 | } |
180 | ||
181 | static void mod_tree_remove_init(struct module *mod) | |
182 | { | |
7523e4dc RR |
183 | if (mod->init_layout.size) |
184 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
185 | } |
186 | ||
187 | static void mod_tree_remove(struct module *mod) | |
188 | { | |
7523e4dc | 189 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
190 | mod_tree_remove_init(mod); |
191 | } | |
192 | ||
6c9692e2 | 193 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
194 | { |
195 | struct latch_tree_node *ltn; | |
196 | ||
4f666546 | 197 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
198 | if (!ltn) |
199 | return NULL; | |
200 | ||
201 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
202 | } | |
203 | ||
6c9692e2 PZ |
204 | #else /* MODULES_TREE_LOOKUP */ |
205 | ||
4f666546 PZ |
206 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
207 | ||
6c9692e2 PZ |
208 | static void mod_tree_insert(struct module *mod) { } |
209 | static void mod_tree_remove_init(struct module *mod) { } | |
210 | static void mod_tree_remove(struct module *mod) { } | |
211 | ||
212 | static struct module *mod_find(unsigned long addr) | |
213 | { | |
214 | struct module *mod; | |
215 | ||
216 | list_for_each_entry_rcu(mod, &modules, list) { | |
217 | if (within_module(addr, mod)) | |
218 | return mod; | |
219 | } | |
220 | ||
221 | return NULL; | |
222 | } | |
223 | ||
224 | #endif /* MODULES_TREE_LOOKUP */ | |
225 | ||
4f666546 PZ |
226 | /* |
227 | * Bounds of module text, for speeding up __module_address. | |
228 | * Protected by module_mutex. | |
229 | */ | |
230 | static void __mod_update_bounds(void *base, unsigned int size) | |
231 | { | |
232 | unsigned long min = (unsigned long)base; | |
233 | unsigned long max = min + size; | |
234 | ||
235 | if (min < module_addr_min) | |
236 | module_addr_min = min; | |
237 | if (max > module_addr_max) | |
238 | module_addr_max = max; | |
239 | } | |
240 | ||
241 | static void mod_update_bounds(struct module *mod) | |
242 | { | |
7523e4dc RR |
243 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
244 | if (mod->init_layout.size) | |
245 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
246 | } |
247 | ||
67fc4e0c JW |
248 | #ifdef CONFIG_KGDB_KDB |
249 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
250 | #endif /* CONFIG_KGDB_KDB */ | |
251 | ||
0be964be PZ |
252 | static void module_assert_mutex(void) |
253 | { | |
254 | lockdep_assert_held(&module_mutex); | |
255 | } | |
256 | ||
257 | static void module_assert_mutex_or_preempt(void) | |
258 | { | |
259 | #ifdef CONFIG_LOCKDEP | |
260 | if (unlikely(!debug_locks)) | |
261 | return; | |
262 | ||
9502514f | 263 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
264 | !lockdep_is_held(&module_mutex)); |
265 | #endif | |
266 | } | |
267 | ||
6727bb9c | 268 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 269 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 270 | |
fda784e5 BM |
271 | /* |
272 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
273 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
274 | */ | |
275 | bool is_module_sig_enforced(void) | |
276 | { | |
277 | return sig_enforce; | |
278 | } | |
279 | EXPORT_SYMBOL(is_module_sig_enforced); | |
280 | ||
8db5da0b MZ |
281 | void set_module_sig_enforced(void) |
282 | { | |
283 | sig_enforce = true; | |
284 | } | |
285 | ||
19e4529e SR |
286 | /* Block module loading/unloading? */ |
287 | int modules_disabled = 0; | |
02608bef | 288 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 289 | |
c9a3ba55 RR |
290 | /* Waiting for a module to finish initializing? */ |
291 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
292 | ||
e041c683 | 293 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 294 | |
6da0b565 | 295 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 296 | { |
e041c683 | 297 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
298 | } |
299 | EXPORT_SYMBOL(register_module_notifier); | |
300 | ||
6da0b565 | 301 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 302 | { |
e041c683 | 303 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
304 | } |
305 | EXPORT_SYMBOL(unregister_module_notifier); | |
306 | ||
71d9f507 MB |
307 | /* |
308 | * We require a truly strong try_module_get(): 0 means success. | |
309 | * Otherwise an error is returned due to ongoing or failed | |
310 | * initialization etc. | |
311 | */ | |
1da177e4 LT |
312 | static inline int strong_try_module_get(struct module *mod) |
313 | { | |
0d21b0e3 | 314 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 315 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
316 | return -EBUSY; |
317 | if (try_module_get(mod)) | |
1da177e4 | 318 | return 0; |
c9a3ba55 RR |
319 | else |
320 | return -ENOENT; | |
1da177e4 LT |
321 | } |
322 | ||
373d4d09 RR |
323 | static inline void add_taint_module(struct module *mod, unsigned flag, |
324 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 325 | { |
373d4d09 | 326 | add_taint(flag, lockdep_ok); |
7fd8329b | 327 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
328 | } |
329 | ||
02a3e59a RD |
330 | /* |
331 | * A thread that wants to hold a reference to a module only while it | |
332 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 333 | */ |
bf262dce | 334 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
335 | { |
336 | module_put(mod); | |
337 | do_exit(code); | |
338 | } | |
339 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 340 | |
1da177e4 | 341 | /* Find a module section: 0 means not found. */ |
49668688 | 342 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
343 | { |
344 | unsigned int i; | |
345 | ||
49668688 RR |
346 | for (i = 1; i < info->hdr->e_shnum; i++) { |
347 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 348 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
349 | if ((shdr->sh_flags & SHF_ALLOC) |
350 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 351 | return i; |
49668688 | 352 | } |
1da177e4 LT |
353 | return 0; |
354 | } | |
355 | ||
5e458cc0 | 356 | /* Find a module section, or NULL. */ |
49668688 | 357 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
358 | { |
359 | /* Section 0 has sh_addr 0. */ | |
49668688 | 360 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
361 | } |
362 | ||
363 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 364 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
365 | const char *name, |
366 | size_t object_size, | |
367 | unsigned int *num) | |
368 | { | |
49668688 | 369 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
370 | |
371 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
372 | *num = info->sechdrs[sec].sh_size / object_size; |
373 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
374 | } |
375 | ||
1da177e4 LT |
376 | /* Provided by the linker */ |
377 | extern const struct kernel_symbol __start___ksymtab[]; | |
378 | extern const struct kernel_symbol __stop___ksymtab[]; | |
379 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
380 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
381 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
382 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
383 | extern const s32 __start___kcrctab[]; |
384 | extern const s32 __start___kcrctab_gpl[]; | |
385 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
386 | #ifdef CONFIG_UNUSED_SYMBOLS |
387 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
388 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
389 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
390 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
391 | extern const s32 __start___kcrctab_unused[]; |
392 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 393 | #endif |
1da177e4 LT |
394 | |
395 | #ifndef CONFIG_MODVERSIONS | |
396 | #define symversion(base, idx) NULL | |
397 | #else | |
f83ca9fe | 398 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
399 | #endif |
400 | ||
dafd0940 RR |
401 | static bool each_symbol_in_section(const struct symsearch *arr, |
402 | unsigned int arrsize, | |
403 | struct module *owner, | |
404 | bool (*fn)(const struct symsearch *syms, | |
405 | struct module *owner, | |
de4d8d53 | 406 | void *data), |
dafd0940 | 407 | void *data) |
ad9546c9 | 408 | { |
de4d8d53 | 409 | unsigned int j; |
ad9546c9 | 410 | |
dafd0940 | 411 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
412 | if (fn(&arr[j], owner, data)) |
413 | return true; | |
f71d20e9 | 414 | } |
dafd0940 RR |
415 | |
416 | return false; | |
ad9546c9 RR |
417 | } |
418 | ||
dafd0940 | 419 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
420 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
421 | struct module *owner, | |
422 | void *data), | |
423 | void *data) | |
ad9546c9 RR |
424 | { |
425 | struct module *mod; | |
44032e63 | 426 | static const struct symsearch arr[] = { |
ad9546c9 | 427 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 428 | NOT_GPL_ONLY, false }, |
ad9546c9 | 429 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
430 | __start___kcrctab_gpl, |
431 | GPL_ONLY, false }, | |
ad9546c9 | 432 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
433 | __start___kcrctab_gpl_future, |
434 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 435 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 436 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
437 | __start___kcrctab_unused, |
438 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 439 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
440 | __start___kcrctab_unused_gpl, |
441 | GPL_ONLY, true }, | |
f7f5b675 | 442 | #endif |
ad9546c9 | 443 | }; |
f71d20e9 | 444 | |
0be964be PZ |
445 | module_assert_mutex_or_preempt(); |
446 | ||
dafd0940 RR |
447 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
448 | return true; | |
f71d20e9 | 449 | |
d72b3751 | 450 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
451 | struct symsearch arr[] = { |
452 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 453 | NOT_GPL_ONLY, false }, |
ad9546c9 | 454 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
455 | mod->gpl_crcs, |
456 | GPL_ONLY, false }, | |
ad9546c9 RR |
457 | { mod->gpl_future_syms, |
458 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
459 | mod->gpl_future_crcs, |
460 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 461 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
462 | { mod->unused_syms, |
463 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
464 | mod->unused_crcs, |
465 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
466 | { mod->unused_gpl_syms, |
467 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
468 | mod->unused_gpl_crcs, |
469 | GPL_ONLY, true }, | |
f7f5b675 | 470 | #endif |
ad9546c9 RR |
471 | }; |
472 | ||
0d21b0e3 RR |
473 | if (mod->state == MODULE_STATE_UNFORMED) |
474 | continue; | |
475 | ||
dafd0940 RR |
476 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
477 | return true; | |
478 | } | |
479 | return false; | |
480 | } | |
de4d8d53 | 481 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
482 | |
483 | struct find_symbol_arg { | |
484 | /* Input */ | |
485 | const char *name; | |
486 | bool gplok; | |
487 | bool warn; | |
488 | ||
489 | /* Output */ | |
490 | struct module *owner; | |
71810db2 | 491 | const s32 *crc; |
414fd31b | 492 | const struct kernel_symbol *sym; |
dafd0940 RR |
493 | }; |
494 | ||
2d25bc55 JY |
495 | static bool check_exported_symbol(const struct symsearch *syms, |
496 | struct module *owner, | |
497 | unsigned int symnum, void *data) | |
dafd0940 RR |
498 | { |
499 | struct find_symbol_arg *fsa = data; | |
500 | ||
dafd0940 RR |
501 | if (!fsa->gplok) { |
502 | if (syms->licence == GPL_ONLY) | |
503 | return false; | |
504 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
505 | pr_warn("Symbol %s is being used by a non-GPL module, " |
506 | "which will not be allowed in the future\n", | |
507 | fsa->name); | |
9f28bb7e | 508 | } |
1da177e4 | 509 | } |
ad9546c9 | 510 | |
f7f5b675 | 511 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 512 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
513 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
514 | "using it.\n", fsa->name); | |
515 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
516 | pr_warn("Please evaluate if this is the right api to use and " |
517 | "if it really is, submit a report to the linux kernel " | |
518 | "mailing list together with submitting your code for " | |
bddb12b3 | 519 | "inclusion.\n"); |
dafd0940 | 520 | } |
f7f5b675 | 521 | #endif |
dafd0940 RR |
522 | |
523 | fsa->owner = owner; | |
524 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 525 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
526 | return true; |
527 | } | |
528 | ||
7290d580 AB |
529 | static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
530 | { | |
531 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
532 | return (unsigned long)offset_to_ptr(&sym->value_offset); | |
533 | #else | |
534 | return sym->value; | |
535 | #endif | |
536 | } | |
537 | ||
538 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) | |
539 | { | |
540 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
541 | return offset_to_ptr(&sym->name_offset); | |
542 | #else | |
543 | return sym->name; | |
544 | #endif | |
545 | } | |
546 | ||
8651ec01 MM |
547 | static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
548 | { | |
549 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
550 | return offset_to_ptr(&sym->namespace_offset); | |
551 | #else | |
552 | return sym->namespace; | |
553 | #endif | |
554 | } | |
555 | ||
403ed278 AIB |
556 | static int cmp_name(const void *va, const void *vb) |
557 | { | |
558 | const char *a; | |
559 | const struct kernel_symbol *b; | |
560 | a = va; b = vb; | |
7290d580 | 561 | return strcmp(a, kernel_symbol_name(b)); |
403ed278 AIB |
562 | } |
563 | ||
2d25bc55 JY |
564 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
565 | struct module *owner, | |
566 | void *data) | |
de4d8d53 RR |
567 | { |
568 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
569 | struct kernel_symbol *sym; |
570 | ||
571 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
572 | sizeof(struct kernel_symbol), cmp_name); | |
573 | ||
2d25bc55 JY |
574 | if (sym != NULL && check_exported_symbol(syms, owner, |
575 | sym - syms->start, data)) | |
403ed278 | 576 | return true; |
de4d8d53 | 577 | |
de4d8d53 RR |
578 | return false; |
579 | } | |
580 | ||
2d25bc55 | 581 | /* Find an exported symbol and return it, along with, (optional) crc and |
75676500 | 582 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
583 | const struct kernel_symbol *find_symbol(const char *name, |
584 | struct module **owner, | |
71810db2 | 585 | const s32 **crc, |
c6b37801 TA |
586 | bool gplok, |
587 | bool warn) | |
dafd0940 RR |
588 | { |
589 | struct find_symbol_arg fsa; | |
590 | ||
591 | fsa.name = name; | |
592 | fsa.gplok = gplok; | |
593 | fsa.warn = warn; | |
594 | ||
2d25bc55 | 595 | if (each_symbol_section(find_exported_symbol_in_section, &fsa)) { |
dafd0940 RR |
596 | if (owner) |
597 | *owner = fsa.owner; | |
598 | if (crc) | |
599 | *crc = fsa.crc; | |
414fd31b | 600 | return fsa.sym; |
dafd0940 RR |
601 | } |
602 | ||
5e124169 | 603 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 604 | return NULL; |
1da177e4 | 605 | } |
c6b37801 | 606 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 607 | |
fe0d34d2 RR |
608 | /* |
609 | * Search for module by name: must hold module_mutex (or preempt disabled | |
610 | * for read-only access). | |
611 | */ | |
4f6de4d5 | 612 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 613 | bool even_unformed) |
1da177e4 LT |
614 | { |
615 | struct module *mod; | |
616 | ||
fe0d34d2 | 617 | module_assert_mutex_or_preempt(); |
0be964be | 618 | |
93437353 | 619 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
620 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
621 | continue; | |
4f6de4d5 | 622 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
623 | return mod; |
624 | } | |
625 | return NULL; | |
626 | } | |
0d21b0e3 RR |
627 | |
628 | struct module *find_module(const char *name) | |
629 | { | |
fe0d34d2 | 630 | module_assert_mutex(); |
4f6de4d5 | 631 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 632 | } |
c6b37801 | 633 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
634 | |
635 | #ifdef CONFIG_SMP | |
fbf59bc9 | 636 | |
259354de | 637 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 638 | { |
259354de TH |
639 | return mod->percpu; |
640 | } | |
fbf59bc9 | 641 | |
9eb76d77 | 642 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 643 | { |
9eb76d77 RR |
644 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
645 | unsigned long align = pcpusec->sh_addralign; | |
646 | ||
647 | if (!pcpusec->sh_size) | |
648 | return 0; | |
649 | ||
fbf59bc9 | 650 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
651 | pr_warn("%s: per-cpu alignment %li > %li\n", |
652 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
653 | align = PAGE_SIZE; |
654 | } | |
655 | ||
9eb76d77 | 656 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 657 | if (!mod->percpu) { |
bddb12b3 AM |
658 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
659 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
660 | return -ENOMEM; |
661 | } | |
9eb76d77 | 662 | mod->percpu_size = pcpusec->sh_size; |
259354de | 663 | return 0; |
fbf59bc9 TH |
664 | } |
665 | ||
259354de | 666 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 667 | { |
259354de | 668 | free_percpu(mod->percpu); |
fbf59bc9 TH |
669 | } |
670 | ||
49668688 | 671 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 672 | { |
49668688 | 673 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
674 | } |
675 | ||
259354de TH |
676 | static void percpu_modcopy(struct module *mod, |
677 | const void *from, unsigned long size) | |
6b588c18 TH |
678 | { |
679 | int cpu; | |
680 | ||
681 | for_each_possible_cpu(cpu) | |
259354de | 682 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
683 | } |
684 | ||
383776fa | 685 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
686 | { |
687 | struct module *mod; | |
688 | unsigned int cpu; | |
689 | ||
690 | preempt_disable(); | |
691 | ||
692 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
693 | if (mod->state == MODULE_STATE_UNFORMED) |
694 | continue; | |
10fad5e4 TH |
695 | if (!mod->percpu_size) |
696 | continue; | |
697 | for_each_possible_cpu(cpu) { | |
698 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 699 | void *va = (void *)addr; |
10fad5e4 | 700 | |
383776fa | 701 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 702 | if (can_addr) { |
383776fa | 703 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
704 | *can_addr += (unsigned long) |
705 | per_cpu_ptr(mod->percpu, | |
706 | get_boot_cpu_id()); | |
707 | } | |
10fad5e4 TH |
708 | preempt_enable(); |
709 | return true; | |
710 | } | |
711 | } | |
712 | } | |
713 | ||
714 | preempt_enable(); | |
715 | return false; | |
6b588c18 TH |
716 | } |
717 | ||
383776fa TG |
718 | /** |
719 | * is_module_percpu_address - test whether address is from module static percpu | |
720 | * @addr: address to test | |
721 | * | |
722 | * Test whether @addr belongs to module static percpu area. | |
723 | * | |
724 | * RETURNS: | |
725 | * %true if @addr is from module static percpu area | |
726 | */ | |
727 | bool is_module_percpu_address(unsigned long addr) | |
728 | { | |
729 | return __is_module_percpu_address(addr, NULL); | |
730 | } | |
731 | ||
1da177e4 | 732 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 733 | |
259354de | 734 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
735 | { |
736 | return NULL; | |
737 | } | |
9eb76d77 | 738 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 739 | { |
9eb76d77 RR |
740 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
741 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
742 | return -ENOMEM; | |
743 | return 0; | |
259354de TH |
744 | } |
745 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 746 | { |
1da177e4 | 747 | } |
49668688 | 748 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
749 | { |
750 | return 0; | |
751 | } | |
259354de TH |
752 | static inline void percpu_modcopy(struct module *mod, |
753 | const void *from, unsigned long size) | |
1da177e4 LT |
754 | { |
755 | /* pcpusec should be 0, and size of that section should be 0. */ | |
756 | BUG_ON(size != 0); | |
757 | } | |
10fad5e4 TH |
758 | bool is_module_percpu_address(unsigned long addr) |
759 | { | |
760 | return false; | |
761 | } | |
6b588c18 | 762 | |
383776fa TG |
763 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
764 | { | |
765 | return false; | |
766 | } | |
767 | ||
1da177e4 LT |
768 | #endif /* CONFIG_SMP */ |
769 | ||
c988d2b2 MD |
770 | #define MODINFO_ATTR(field) \ |
771 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
772 | { \ | |
773 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
774 | } \ | |
775 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 776 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 777 | { \ |
cc56ded3 | 778 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
779 | } \ |
780 | static int modinfo_##field##_exists(struct module *mod) \ | |
781 | { \ | |
782 | return mod->field != NULL; \ | |
783 | } \ | |
784 | static void free_modinfo_##field(struct module *mod) \ | |
785 | { \ | |
22a8bdeb DW |
786 | kfree(mod->field); \ |
787 | mod->field = NULL; \ | |
c988d2b2 MD |
788 | } \ |
789 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 790 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
791 | .show = show_modinfo_##field, \ |
792 | .setup = setup_modinfo_##field, \ | |
793 | .test = modinfo_##field##_exists, \ | |
794 | .free = free_modinfo_##field, \ | |
795 | }; | |
796 | ||
797 | MODINFO_ATTR(version); | |
798 | MODINFO_ATTR(srcversion); | |
799 | ||
e14af7ee AV |
800 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
801 | ||
03e88ae1 | 802 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
803 | |
804 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
805 | ||
e513cc1c MH |
806 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
807 | #define MODULE_REF_BASE 1 | |
808 | ||
1da177e4 | 809 | /* Init the unload section of the module. */ |
9f85a4bb | 810 | static int module_unload_init(struct module *mod) |
1da177e4 | 811 | { |
e513cc1c MH |
812 | /* |
813 | * Initialize reference counter to MODULE_REF_BASE. | |
814 | * refcnt == 0 means module is going. | |
815 | */ | |
816 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 817 | |
2c02dfe7 LT |
818 | INIT_LIST_HEAD(&mod->source_list); |
819 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 820 | |
1da177e4 | 821 | /* Hold reference count during initialization. */ |
e513cc1c | 822 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
823 | |
824 | return 0; | |
1da177e4 LT |
825 | } |
826 | ||
1da177e4 LT |
827 | /* Does a already use b? */ |
828 | static int already_uses(struct module *a, struct module *b) | |
829 | { | |
830 | struct module_use *use; | |
831 | ||
2c02dfe7 LT |
832 | list_for_each_entry(use, &b->source_list, source_list) { |
833 | if (use->source == a) { | |
5e124169 | 834 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
835 | return 1; |
836 | } | |
837 | } | |
5e124169 | 838 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
839 | return 0; |
840 | } | |
841 | ||
2c02dfe7 LT |
842 | /* |
843 | * Module a uses b | |
844 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
845 | * - the module_use is added to the list of 'b' sources (so | |
846 | * 'b' can walk the list to see who sourced them), and of 'a' | |
847 | * targets (so 'a' can see what modules it targets). | |
848 | */ | |
849 | static int add_module_usage(struct module *a, struct module *b) | |
850 | { | |
2c02dfe7 LT |
851 | struct module_use *use; |
852 | ||
5e124169 | 853 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 854 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 855 | if (!use) |
2c02dfe7 | 856 | return -ENOMEM; |
2c02dfe7 LT |
857 | |
858 | use->source = a; | |
859 | use->target = b; | |
860 | list_add(&use->source_list, &b->source_list); | |
861 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
862 | return 0; |
863 | } | |
864 | ||
75676500 | 865 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 866 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 867 | { |
c8e21ced | 868 | int err; |
270a6c4c | 869 | |
9bea7f23 | 870 | if (b == NULL || already_uses(a, b)) |
218ce735 | 871 | return 0; |
218ce735 | 872 | |
9bea7f23 RR |
873 | /* If module isn't available, we fail. */ |
874 | err = strong_try_module_get(b); | |
c9a3ba55 | 875 | if (err) |
9bea7f23 | 876 | return err; |
1da177e4 | 877 | |
2c02dfe7 LT |
878 | err = add_module_usage(a, b); |
879 | if (err) { | |
1da177e4 | 880 | module_put(b); |
9bea7f23 | 881 | return err; |
1da177e4 | 882 | } |
9bea7f23 | 883 | return 0; |
1da177e4 | 884 | } |
9bea7f23 | 885 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
886 | |
887 | /* Clear the unload stuff of the module. */ | |
888 | static void module_unload_free(struct module *mod) | |
889 | { | |
2c02dfe7 | 890 | struct module_use *use, *tmp; |
1da177e4 | 891 | |
75676500 | 892 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
893 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
894 | struct module *i = use->target; | |
5e124169 | 895 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
896 | module_put(i); |
897 | list_del(&use->source_list); | |
898 | list_del(&use->target_list); | |
899 | kfree(use); | |
1da177e4 | 900 | } |
75676500 | 901 | mutex_unlock(&module_mutex); |
1da177e4 LT |
902 | } |
903 | ||
904 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 905 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
906 | { |
907 | int ret = (flags & O_TRUNC); | |
908 | if (ret) | |
373d4d09 | 909 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
910 | return ret; |
911 | } | |
912 | #else | |
fb169793 | 913 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
914 | { |
915 | return 0; | |
916 | } | |
917 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
918 | ||
e513cc1c MH |
919 | /* Try to release refcount of module, 0 means success. */ |
920 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 921 | { |
e513cc1c | 922 | int ret; |
1da177e4 | 923 | |
e513cc1c MH |
924 | /* Try to decrement refcnt which we set at loading */ |
925 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
926 | BUG_ON(ret < 0); | |
927 | if (ret) | |
928 | /* Someone can put this right now, recover with checking */ | |
929 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 930 | |
e513cc1c MH |
931 | return ret; |
932 | } | |
1da177e4 | 933 | |
e513cc1c MH |
934 | static int try_stop_module(struct module *mod, int flags, int *forced) |
935 | { | |
da39ba5e | 936 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
937 | if (try_release_module_ref(mod) != 0) { |
938 | *forced = try_force_unload(flags); | |
939 | if (!(*forced)) | |
1da177e4 LT |
940 | return -EWOULDBLOCK; |
941 | } | |
942 | ||
943 | /* Mark it as dying. */ | |
e513cc1c | 944 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 945 | |
e513cc1c | 946 | return 0; |
1da177e4 LT |
947 | } |
948 | ||
d5db139a RR |
949 | /** |
950 | * module_refcount - return the refcount or -1 if unloading | |
951 | * | |
952 | * @mod: the module we're checking | |
953 | * | |
954 | * Returns: | |
955 | * -1 if the module is in the process of unloading | |
956 | * otherwise the number of references in the kernel to the module | |
957 | */ | |
958 | int module_refcount(struct module *mod) | |
1da177e4 | 959 | { |
d5db139a | 960 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
961 | } |
962 | EXPORT_SYMBOL(module_refcount); | |
963 | ||
964 | /* This exists whether we can unload or not */ | |
965 | static void free_module(struct module *mod); | |
966 | ||
17da2bd9 HC |
967 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
968 | unsigned int, flags) | |
1da177e4 LT |
969 | { |
970 | struct module *mod; | |
dfff0a06 | 971 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
972 | int ret, forced = 0; |
973 | ||
3d43321b | 974 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
975 | return -EPERM; |
976 | ||
977 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
978 | return -EFAULT; | |
979 | name[MODULE_NAME_LEN-1] = '\0'; | |
980 | ||
f6276ac9 RGB |
981 | audit_log_kern_module(name); |
982 | ||
3fc1f1e2 TH |
983 | if (mutex_lock_interruptible(&module_mutex) != 0) |
984 | return -EINTR; | |
1da177e4 LT |
985 | |
986 | mod = find_module(name); | |
987 | if (!mod) { | |
988 | ret = -ENOENT; | |
989 | goto out; | |
990 | } | |
991 | ||
2c02dfe7 | 992 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
993 | /* Other modules depend on us: get rid of them first. */ |
994 | ret = -EWOULDBLOCK; | |
995 | goto out; | |
996 | } | |
997 | ||
998 | /* Doing init or already dying? */ | |
999 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 1000 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 1001 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
1002 | ret = -EBUSY; |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 1007 | if (mod->init && !mod->exit) { |
fb169793 | 1008 | forced = try_force_unload(flags); |
1da177e4 LT |
1009 | if (!forced) { |
1010 | /* This module can't be removed */ | |
1011 | ret = -EBUSY; | |
1012 | goto out; | |
1013 | } | |
1014 | } | |
1015 | ||
1da177e4 LT |
1016 | /* Stop the machine so refcounts can't move and disable module. */ |
1017 | ret = try_stop_module(mod, flags, &forced); | |
1018 | if (ret != 0) | |
1019 | goto out; | |
1020 | ||
df4b565e | 1021 | mutex_unlock(&module_mutex); |
25985edc | 1022 | /* Final destruction now no one is using it. */ |
df4b565e | 1023 | if (mod->exit != NULL) |
1da177e4 | 1024 | mod->exit(); |
df4b565e PO |
1025 | blocking_notifier_call_chain(&module_notify_list, |
1026 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1027 | klp_module_going(mod); |
7dcd182b JY |
1028 | ftrace_release_mod(mod); |
1029 | ||
22a9d645 | 1030 | async_synchronize_full(); |
75676500 | 1031 | |
e14af7ee | 1032 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1033 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1034 | |
75676500 RR |
1035 | free_module(mod); |
1036 | return 0; | |
1037 | out: | |
6389a385 | 1038 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1039 | return ret; |
1040 | } | |
1041 | ||
d1e99d7a | 1042 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1043 | { |
1044 | struct module_use *use; | |
1045 | int printed_something = 0; | |
1046 | ||
d5db139a | 1047 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1048 | |
6da0b565 IA |
1049 | /* |
1050 | * Always include a trailing , so userspace can differentiate | |
1051 | * between this and the old multi-field proc format. | |
1052 | */ | |
2c02dfe7 | 1053 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1054 | printed_something = 1; |
2c02dfe7 | 1055 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1056 | } |
1057 | ||
1da177e4 LT |
1058 | if (mod->init != NULL && mod->exit == NULL) { |
1059 | printed_something = 1; | |
6da0b565 | 1060 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1061 | } |
1062 | ||
1063 | if (!printed_something) | |
6da0b565 | 1064 | seq_puts(m, "-"); |
1da177e4 LT |
1065 | } |
1066 | ||
1067 | void __symbol_put(const char *symbol) | |
1068 | { | |
1069 | struct module *owner; | |
1da177e4 | 1070 | |
24da1cbf | 1071 | preempt_disable(); |
414fd31b | 1072 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1073 | BUG(); |
1074 | module_put(owner); | |
24da1cbf | 1075 | preempt_enable(); |
1da177e4 LT |
1076 | } |
1077 | EXPORT_SYMBOL(__symbol_put); | |
1078 | ||
7d1d16e4 | 1079 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1080 | void symbol_put_addr(void *addr) |
1081 | { | |
5e376613 | 1082 | struct module *modaddr; |
7d1d16e4 | 1083 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1084 | |
7d1d16e4 | 1085 | if (core_kernel_text(a)) |
5e376613 | 1086 | return; |
1da177e4 | 1087 | |
275d7d44 PZ |
1088 | /* |
1089 | * Even though we hold a reference on the module; we still need to | |
1090 | * disable preemption in order to safely traverse the data structure. | |
1091 | */ | |
1092 | preempt_disable(); | |
7d1d16e4 | 1093 | modaddr = __module_text_address(a); |
a6e6abd5 | 1094 | BUG_ON(!modaddr); |
5e376613 | 1095 | module_put(modaddr); |
275d7d44 | 1096 | preempt_enable(); |
1da177e4 LT |
1097 | } |
1098 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1099 | ||
1100 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1101 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1102 | { |
d5db139a | 1103 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1104 | } |
1105 | ||
cca3e707 KS |
1106 | static struct module_attribute modinfo_refcnt = |
1107 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1108 | |
d53799be SR |
1109 | void __module_get(struct module *module) |
1110 | { | |
1111 | if (module) { | |
1112 | preempt_disable(); | |
2f35c41f | 1113 | atomic_inc(&module->refcnt); |
d53799be SR |
1114 | trace_module_get(module, _RET_IP_); |
1115 | preempt_enable(); | |
1116 | } | |
1117 | } | |
1118 | EXPORT_SYMBOL(__module_get); | |
1119 | ||
1120 | bool try_module_get(struct module *module) | |
1121 | { | |
1122 | bool ret = true; | |
1123 | ||
1124 | if (module) { | |
1125 | preempt_disable(); | |
e513cc1c MH |
1126 | /* Note: here, we can fail to get a reference */ |
1127 | if (likely(module_is_live(module) && | |
1128 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1129 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1130 | else |
d53799be SR |
1131 | ret = false; |
1132 | ||
1133 | preempt_enable(); | |
1134 | } | |
1135 | return ret; | |
1136 | } | |
1137 | EXPORT_SYMBOL(try_module_get); | |
1138 | ||
f6a57033 AV |
1139 | void module_put(struct module *module) |
1140 | { | |
e513cc1c MH |
1141 | int ret; |
1142 | ||
f6a57033 | 1143 | if (module) { |
e1783a24 | 1144 | preempt_disable(); |
e513cc1c MH |
1145 | ret = atomic_dec_if_positive(&module->refcnt); |
1146 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1147 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1148 | preempt_enable(); |
f6a57033 AV |
1149 | } |
1150 | } | |
1151 | EXPORT_SYMBOL(module_put); | |
1152 | ||
1da177e4 | 1153 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1154 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1155 | { |
1156 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1157 | seq_puts(m, " - -"); |
1da177e4 LT |
1158 | } |
1159 | ||
1160 | static inline void module_unload_free(struct module *mod) | |
1161 | { | |
1162 | } | |
1163 | ||
9bea7f23 | 1164 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1165 | { |
9bea7f23 | 1166 | return strong_try_module_get(b); |
1da177e4 | 1167 | } |
9bea7f23 | 1168 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1169 | |
9f85a4bb | 1170 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1171 | { |
9f85a4bb | 1172 | return 0; |
1da177e4 LT |
1173 | } |
1174 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1175 | ||
53999bf3 KW |
1176 | static size_t module_flags_taint(struct module *mod, char *buf) |
1177 | { | |
1178 | size_t l = 0; | |
7fd8329b PM |
1179 | int i; |
1180 | ||
1181 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1182 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1183 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1184 | } |
53999bf3 | 1185 | |
53999bf3 KW |
1186 | return l; |
1187 | } | |
1188 | ||
1f71740a | 1189 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1190 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1191 | { |
1192 | const char *state = "unknown"; | |
1193 | ||
4befb026 | 1194 | switch (mk->mod->state) { |
1f71740a KS |
1195 | case MODULE_STATE_LIVE: |
1196 | state = "live"; | |
1197 | break; | |
1198 | case MODULE_STATE_COMING: | |
1199 | state = "coming"; | |
1200 | break; | |
1201 | case MODULE_STATE_GOING: | |
1202 | state = "going"; | |
1203 | break; | |
0d21b0e3 RR |
1204 | default: |
1205 | BUG(); | |
1f71740a KS |
1206 | } |
1207 | return sprintf(buffer, "%s\n", state); | |
1208 | } | |
1209 | ||
cca3e707 KS |
1210 | static struct module_attribute modinfo_initstate = |
1211 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1212 | |
88bfa324 KS |
1213 | static ssize_t store_uevent(struct module_attribute *mattr, |
1214 | struct module_kobject *mk, | |
1215 | const char *buffer, size_t count) | |
1216 | { | |
df44b479 PR |
1217 | int rc; |
1218 | ||
1219 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1220 | return rc ? rc : count; | |
88bfa324 KS |
1221 | } |
1222 | ||
cca3e707 KS |
1223 | struct module_attribute module_uevent = |
1224 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1225 | ||
1226 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1227 | struct module_kobject *mk, char *buffer) | |
1228 | { | |
7523e4dc | 1229 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1230 | } |
1231 | ||
1232 | static struct module_attribute modinfo_coresize = | |
1233 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1234 | ||
1235 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1236 | struct module_kobject *mk, char *buffer) | |
1237 | { | |
7523e4dc | 1238 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1239 | } |
1240 | ||
1241 | static struct module_attribute modinfo_initsize = | |
1242 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1243 | ||
1244 | static ssize_t show_taint(struct module_attribute *mattr, | |
1245 | struct module_kobject *mk, char *buffer) | |
1246 | { | |
1247 | size_t l; | |
1248 | ||
1249 | l = module_flags_taint(mk->mod, buffer); | |
1250 | buffer[l++] = '\n'; | |
1251 | return l; | |
1252 | } | |
1253 | ||
1254 | static struct module_attribute modinfo_taint = | |
1255 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1256 | |
03e88ae1 | 1257 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1258 | &module_uevent, |
03e88ae1 GKH |
1259 | &modinfo_version, |
1260 | &modinfo_srcversion, | |
cca3e707 KS |
1261 | &modinfo_initstate, |
1262 | &modinfo_coresize, | |
1263 | &modinfo_initsize, | |
1264 | &modinfo_taint, | |
03e88ae1 | 1265 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1266 | &modinfo_refcnt, |
03e88ae1 GKH |
1267 | #endif |
1268 | NULL, | |
1269 | }; | |
1270 | ||
1da177e4 LT |
1271 | static const char vermagic[] = VERMAGIC_STRING; |
1272 | ||
c6e665c8 | 1273 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1274 | { |
1275 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1276 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1277 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1278 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1279 | return 0; |
1280 | #else | |
1281 | return -ENOEXEC; | |
1282 | #endif | |
1283 | } | |
1284 | ||
1da177e4 | 1285 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1286 | |
1287 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1288 | { |
71810db2 | 1289 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1290 | } |
1291 | ||
49019426 | 1292 | static int check_version(const struct load_info *info, |
1da177e4 | 1293 | const char *symname, |
6da0b565 | 1294 | struct module *mod, |
71810db2 | 1295 | const s32 *crc) |
1da177e4 | 1296 | { |
49019426 KC |
1297 | Elf_Shdr *sechdrs = info->sechdrs; |
1298 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1299 | unsigned int i, num_versions; |
1300 | struct modversion_info *versions; | |
1301 | ||
1302 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1303 | if (!crc) | |
1304 | return 1; | |
1305 | ||
a5dd6970 RR |
1306 | /* No versions at all? modprobe --force does this. */ |
1307 | if (versindex == 0) | |
1308 | return try_to_force_load(mod, symname) == 0; | |
1309 | ||
1da177e4 LT |
1310 | versions = (void *) sechdrs[versindex].sh_addr; |
1311 | num_versions = sechdrs[versindex].sh_size | |
1312 | / sizeof(struct modversion_info); | |
1313 | ||
1314 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1315 | u32 crcval; |
1316 | ||
1da177e4 LT |
1317 | if (strcmp(versions[i].name, symname) != 0) |
1318 | continue; | |
1319 | ||
71810db2 AB |
1320 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1321 | crcval = resolve_rel_crc(crc); | |
1322 | else | |
1323 | crcval = *crc; | |
1324 | if (versions[i].crc == crcval) | |
1da177e4 | 1325 | return 1; |
71810db2 AB |
1326 | pr_debug("Found checksum %X vs module %lX\n", |
1327 | crcval, versions[i].crc); | |
826e4506 | 1328 | goto bad_version; |
1da177e4 | 1329 | } |
826e4506 | 1330 | |
faaae2a5 | 1331 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1332 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1333 | return 1; |
826e4506 LT |
1334 | |
1335 | bad_version: | |
6da0b565 | 1336 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1337 | info->name, symname); |
826e4506 | 1338 | return 0; |
1da177e4 LT |
1339 | } |
1340 | ||
49019426 | 1341 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1342 | struct module *mod) |
1343 | { | |
71810db2 | 1344 | const s32 *crc; |
1da177e4 | 1345 | |
926a59b1 PZ |
1346 | /* |
1347 | * Since this should be found in kernel (which can't be removed), no | |
1348 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1349 | */ | |
1350 | preempt_disable(); | |
996302c5 | 1351 | if (!find_symbol("module_layout", NULL, &crc, true, false)) { |
926a59b1 | 1352 | preempt_enable(); |
1da177e4 | 1353 | BUG(); |
926a59b1 PZ |
1354 | } |
1355 | preempt_enable(); | |
996302c5 | 1356 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1357 | } |
1358 | ||
91e37a79 RR |
1359 | /* First part is kernel version, which we ignore if module has crcs. */ |
1360 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1361 | bool has_crcs) | |
1da177e4 | 1362 | { |
91e37a79 RR |
1363 | if (has_crcs) { |
1364 | amagic += strcspn(amagic, " "); | |
1365 | bmagic += strcspn(bmagic, " "); | |
1366 | } | |
1da177e4 LT |
1367 | return strcmp(amagic, bmagic) == 0; |
1368 | } | |
1369 | #else | |
49019426 | 1370 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1371 | const char *symname, |
6da0b565 | 1372 | struct module *mod, |
71810db2 | 1373 | const s32 *crc) |
1da177e4 LT |
1374 | { |
1375 | return 1; | |
1376 | } | |
1377 | ||
49019426 | 1378 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1379 | struct module *mod) |
1380 | { | |
1381 | return 1; | |
1382 | } | |
1383 | ||
91e37a79 RR |
1384 | static inline int same_magic(const char *amagic, const char *bmagic, |
1385 | bool has_crcs) | |
1da177e4 LT |
1386 | { |
1387 | return strcmp(amagic, bmagic) == 0; | |
1388 | } | |
1389 | #endif /* CONFIG_MODVERSIONS */ | |
1390 | ||
8651ec01 MM |
1391 | static char *get_modinfo(const struct load_info *info, const char *tag); |
1392 | static char *get_next_modinfo(const struct load_info *info, const char *tag, | |
1393 | char *prev); | |
1394 | ||
1395 | static int verify_namespace_is_imported(const struct load_info *info, | |
1396 | const struct kernel_symbol *sym, | |
1397 | struct module *mod) | |
1398 | { | |
1399 | const char *namespace; | |
1400 | char *imported_namespace; | |
1401 | ||
1402 | namespace = kernel_symbol_namespace(sym); | |
1403 | if (namespace) { | |
1404 | imported_namespace = get_modinfo(info, "import_ns"); | |
1405 | while (imported_namespace) { | |
1406 | if (strcmp(namespace, imported_namespace) == 0) | |
1407 | return 0; | |
1408 | imported_namespace = get_next_modinfo( | |
1409 | info, "import_ns", imported_namespace); | |
1410 | } | |
1411 | pr_err("%s: module uses symbol (%s) from namespace %s, but does not import it.\n", | |
1412 | mod->name, kernel_symbol_name(sym), namespace); | |
1413 | return -EINVAL; | |
1414 | } | |
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | ||
75676500 | 1419 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1420 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1421 | const struct load_info *info, | |
414fd31b | 1422 | const char *name, |
9bea7f23 | 1423 | char ownername[]) |
1da177e4 LT |
1424 | { |
1425 | struct module *owner; | |
414fd31b | 1426 | const struct kernel_symbol *sym; |
71810db2 | 1427 | const s32 *crc; |
9bea7f23 | 1428 | int err; |
1da177e4 | 1429 | |
d64810f5 PZ |
1430 | /* |
1431 | * The module_mutex should not be a heavily contended lock; | |
1432 | * if we get the occasional sleep here, we'll go an extra iteration | |
1433 | * in the wait_event_interruptible(), which is harmless. | |
1434 | */ | |
1435 | sched_annotate_sleep(); | |
75676500 | 1436 | mutex_lock(&module_mutex); |
414fd31b | 1437 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1438 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1439 | if (!sym) |
1440 | goto unlock; | |
1441 | ||
49019426 | 1442 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1443 | sym = ERR_PTR(-EINVAL); |
1444 | goto getname; | |
1da177e4 | 1445 | } |
9bea7f23 | 1446 | |
8651ec01 MM |
1447 | err = verify_namespace_is_imported(info, sym, mod); |
1448 | if (err) { | |
1449 | sym = ERR_PTR(err); | |
1450 | goto getname; | |
1451 | } | |
1452 | ||
9bea7f23 RR |
1453 | err = ref_module(mod, owner); |
1454 | if (err) { | |
1455 | sym = ERR_PTR(err); | |
1456 | goto getname; | |
1457 | } | |
1458 | ||
1459 | getname: | |
1460 | /* We must make copy under the lock if we failed to get ref. */ | |
1461 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1462 | unlock: | |
75676500 | 1463 | mutex_unlock(&module_mutex); |
218ce735 | 1464 | return sym; |
1da177e4 LT |
1465 | } |
1466 | ||
49668688 RR |
1467 | static const struct kernel_symbol * |
1468 | resolve_symbol_wait(struct module *mod, | |
1469 | const struct load_info *info, | |
1470 | const char *name) | |
9bea7f23 RR |
1471 | { |
1472 | const struct kernel_symbol *ksym; | |
49668688 | 1473 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1474 | |
1475 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1476 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1477 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1478 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1479 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1480 | mod->name, owner); | |
9bea7f23 RR |
1481 | } |
1482 | return ksym; | |
1483 | } | |
1484 | ||
1da177e4 LT |
1485 | /* |
1486 | * /sys/module/foo/sections stuff | |
1487 | * J. Corbet <corbet@lwn.net> | |
1488 | */ | |
8f6d0378 | 1489 | #ifdef CONFIG_SYSFS |
10b465aa | 1490 | |
8f6d0378 | 1491 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1492 | static inline bool sect_empty(const Elf_Shdr *sect) |
1493 | { | |
1494 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1495 | } | |
1496 | ||
6da0b565 | 1497 | struct module_sect_attr { |
a58730c4 RR |
1498 | struct module_attribute mattr; |
1499 | char *name; | |
1500 | unsigned long address; | |
1501 | }; | |
1502 | ||
6da0b565 | 1503 | struct module_sect_attrs { |
a58730c4 RR |
1504 | struct attribute_group grp; |
1505 | unsigned int nsections; | |
1506 | struct module_sect_attr attrs[0]; | |
1507 | }; | |
1508 | ||
1da177e4 | 1509 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1510 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1511 | { |
1512 | struct module_sect_attr *sattr = | |
1513 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1514 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1515 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1516 | } |
1517 | ||
04b1db9f IN |
1518 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1519 | { | |
a58730c4 | 1520 | unsigned int section; |
04b1db9f IN |
1521 | |
1522 | for (section = 0; section < sect_attrs->nsections; section++) | |
1523 | kfree(sect_attrs->attrs[section].name); | |
1524 | kfree(sect_attrs); | |
1525 | } | |
1526 | ||
8f6d0378 | 1527 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1528 | { |
1529 | unsigned int nloaded = 0, i, size[2]; | |
1530 | struct module_sect_attrs *sect_attrs; | |
1531 | struct module_sect_attr *sattr; | |
1532 | struct attribute **gattr; | |
22a8bdeb | 1533 | |
1da177e4 | 1534 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1535 | for (i = 0; i < info->hdr->e_shnum; i++) |
1536 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 | 1537 | nloaded++; |
8d1b73dd | 1538 | size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
1da177e4 LT |
1539 | sizeof(sect_attrs->grp.attrs[0])); |
1540 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1541 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1542 | if (sect_attrs == NULL) | |
1da177e4 LT |
1543 | return; |
1544 | ||
1545 | /* Setup section attributes. */ | |
1546 | sect_attrs->grp.name = "sections"; | |
1547 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1548 | ||
04b1db9f | 1549 | sect_attrs->nsections = 0; |
1da177e4 LT |
1550 | sattr = §_attrs->attrs[0]; |
1551 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1552 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1553 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1554 | if (sect_empty(sec)) | |
35dead42 | 1555 | continue; |
8f6d0378 RR |
1556 | sattr->address = sec->sh_addr; |
1557 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1558 | GFP_KERNEL); |
1559 | if (sattr->name == NULL) | |
1560 | goto out; | |
1561 | sect_attrs->nsections++; | |
361795b1 | 1562 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1563 | sattr->mattr.show = module_sect_show; |
1564 | sattr->mattr.store = NULL; | |
1565 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1566 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1567 | *(gattr++) = &(sattr++)->mattr.attr; |
1568 | } | |
1569 | *gattr = NULL; | |
1570 | ||
1571 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1572 | goto out; | |
1573 | ||
1574 | mod->sect_attrs = sect_attrs; | |
1575 | return; | |
1576 | out: | |
04b1db9f | 1577 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1578 | } |
1579 | ||
1580 | static void remove_sect_attrs(struct module *mod) | |
1581 | { | |
1582 | if (mod->sect_attrs) { | |
1583 | sysfs_remove_group(&mod->mkobj.kobj, | |
1584 | &mod->sect_attrs->grp); | |
1585 | /* We are positive that no one is using any sect attrs | |
1586 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1587 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1588 | mod->sect_attrs = NULL; |
1589 | } | |
1590 | } | |
1591 | ||
6d760133 RM |
1592 | /* |
1593 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1594 | */ | |
1595 | ||
1596 | struct module_notes_attrs { | |
1597 | struct kobject *dir; | |
1598 | unsigned int notes; | |
1599 | struct bin_attribute attrs[0]; | |
1600 | }; | |
1601 | ||
2c3c8bea | 1602 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1603 | struct bin_attribute *bin_attr, |
1604 | char *buf, loff_t pos, size_t count) | |
1605 | { | |
1606 | /* | |
1607 | * The caller checked the pos and count against our size. | |
1608 | */ | |
1609 | memcpy(buf, bin_attr->private + pos, count); | |
1610 | return count; | |
1611 | } | |
1612 | ||
1613 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1614 | unsigned int i) | |
1615 | { | |
1616 | if (notes_attrs->dir) { | |
1617 | while (i-- > 0) | |
1618 | sysfs_remove_bin_file(notes_attrs->dir, | |
1619 | ¬es_attrs->attrs[i]); | |
e9432093 | 1620 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1621 | } |
1622 | kfree(notes_attrs); | |
1623 | } | |
1624 | ||
8f6d0378 | 1625 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1626 | { |
1627 | unsigned int notes, loaded, i; | |
1628 | struct module_notes_attrs *notes_attrs; | |
1629 | struct bin_attribute *nattr; | |
1630 | ||
ea6bff36 IM |
1631 | /* failed to create section attributes, so can't create notes */ |
1632 | if (!mod->sect_attrs) | |
1633 | return; | |
1634 | ||
6d760133 RM |
1635 | /* Count notes sections and allocate structures. */ |
1636 | notes = 0; | |
8f6d0378 RR |
1637 | for (i = 0; i < info->hdr->e_shnum; i++) |
1638 | if (!sect_empty(&info->sechdrs[i]) && | |
1639 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1640 | ++notes; |
1641 | ||
1642 | if (notes == 0) | |
1643 | return; | |
1644 | ||
acafe7e3 | 1645 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1646 | GFP_KERNEL); |
1647 | if (notes_attrs == NULL) | |
1648 | return; | |
1649 | ||
1650 | notes_attrs->notes = notes; | |
1651 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1652 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1653 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1654 | continue; |
8f6d0378 | 1655 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1656 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1657 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1658 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1659 | nattr->size = info->sechdrs[i].sh_size; |
1660 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1661 | nattr->read = module_notes_read; |
1662 | ++nattr; | |
1663 | } | |
1664 | ++loaded; | |
1665 | } | |
1666 | ||
4ff6abff | 1667 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1668 | if (!notes_attrs->dir) |
1669 | goto out; | |
1670 | ||
1671 | for (i = 0; i < notes; ++i) | |
1672 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1673 | ¬es_attrs->attrs[i])) | |
1674 | goto out; | |
1675 | ||
1676 | mod->notes_attrs = notes_attrs; | |
1677 | return; | |
1678 | ||
1679 | out: | |
1680 | free_notes_attrs(notes_attrs, i); | |
1681 | } | |
1682 | ||
1683 | static void remove_notes_attrs(struct module *mod) | |
1684 | { | |
1685 | if (mod->notes_attrs) | |
1686 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1687 | } | |
1688 | ||
1da177e4 | 1689 | #else |
04b1db9f | 1690 | |
8f6d0378 RR |
1691 | static inline void add_sect_attrs(struct module *mod, |
1692 | const struct load_info *info) | |
1da177e4 LT |
1693 | { |
1694 | } | |
1695 | ||
1696 | static inline void remove_sect_attrs(struct module *mod) | |
1697 | { | |
1698 | } | |
6d760133 | 1699 | |
8f6d0378 RR |
1700 | static inline void add_notes_attrs(struct module *mod, |
1701 | const struct load_info *info) | |
6d760133 RM |
1702 | { |
1703 | } | |
1704 | ||
1705 | static inline void remove_notes_attrs(struct module *mod) | |
1706 | { | |
1707 | } | |
8f6d0378 | 1708 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1709 | |
1ba5c08b | 1710 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1711 | { |
1712 | #ifdef CONFIG_MODULE_UNLOAD | |
1713 | struct module_use *use; | |
80a3d1bb | 1714 | |
75676500 | 1715 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1716 | list_for_each_entry(use, &mod->target_list, target_list) |
1717 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1718 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1719 | #endif |
1720 | } | |
1721 | ||
1ba5c08b | 1722 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1723 | { |
1ba5c08b | 1724 | int ret = 0; |
80a3d1bb RR |
1725 | #ifdef CONFIG_MODULE_UNLOAD |
1726 | struct module_use *use; | |
1727 | ||
75676500 | 1728 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1729 | list_for_each_entry(use, &mod->target_list, target_list) { |
1730 | ret = sysfs_create_link(use->target->holders_dir, | |
1731 | &mod->mkobj.kobj, mod->name); | |
1732 | if (ret) | |
1733 | break; | |
1734 | } | |
75676500 | 1735 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1736 | if (ret) |
1737 | del_usage_links(mod); | |
80a3d1bb | 1738 | #endif |
1ba5c08b | 1739 | return ret; |
80a3d1bb RR |
1740 | } |
1741 | ||
bc6f2a75 Y |
1742 | static void module_remove_modinfo_attrs(struct module *mod, int end); |
1743 | ||
6407ebb2 | 1744 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1745 | { |
1746 | struct module_attribute *attr; | |
03e88ae1 | 1747 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1748 | int error = 0; |
1749 | int i; | |
1750 | ||
03e88ae1 GKH |
1751 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1752 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1753 | GFP_KERNEL); | |
1754 | if (!mod->modinfo_attrs) | |
1755 | return -ENOMEM; | |
1756 | ||
1757 | temp_attr = mod->modinfo_attrs; | |
bc6f2a75 | 1758 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
c75b590d | 1759 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1760 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1761 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1762 | error = sysfs_create_file(&mod->mkobj.kobj, |
1763 | &temp_attr->attr); | |
bc6f2a75 Y |
1764 | if (error) |
1765 | goto error_out; | |
03e88ae1 GKH |
1766 | ++temp_attr; |
1767 | } | |
c988d2b2 | 1768 | } |
bc6f2a75 Y |
1769 | |
1770 | return 0; | |
1771 | ||
1772 | error_out: | |
1773 | if (i > 0) | |
1774 | module_remove_modinfo_attrs(mod, --i); | |
c988d2b2 MD |
1775 | return error; |
1776 | } | |
1777 | ||
bc6f2a75 | 1778 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
c988d2b2 MD |
1779 | { |
1780 | struct module_attribute *attr; | |
1781 | int i; | |
1782 | ||
03e88ae1 | 1783 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
bc6f2a75 Y |
1784 | if (end >= 0 && i > end) |
1785 | break; | |
03e88ae1 GKH |
1786 | /* pick a field to test for end of list */ |
1787 | if (!attr->attr.name) | |
1788 | break; | |
6da0b565 | 1789 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1790 | if (attr->free) |
1791 | attr->free(mod); | |
c988d2b2 | 1792 | } |
03e88ae1 | 1793 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1794 | } |
1da177e4 | 1795 | |
942e4431 LZ |
1796 | static void mod_kobject_put(struct module *mod) |
1797 | { | |
1798 | DECLARE_COMPLETION_ONSTACK(c); | |
1799 | mod->mkobj.kobj_completion = &c; | |
1800 | kobject_put(&mod->mkobj.kobj); | |
1801 | wait_for_completion(&c); | |
1802 | } | |
1803 | ||
6407ebb2 | 1804 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1805 | { |
1806 | int err; | |
6494a93d | 1807 | struct kobject *kobj; |
1da177e4 | 1808 | |
823bccfc | 1809 | if (!module_sysfs_initialized) { |
bddb12b3 | 1810 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1811 | err = -EINVAL; |
1812 | goto out; | |
1813 | } | |
6494a93d GKH |
1814 | |
1815 | kobj = kset_find_obj(module_kset, mod->name); | |
1816 | if (kobj) { | |
bddb12b3 | 1817 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1818 | kobject_put(kobj); |
1819 | err = -EINVAL; | |
1820 | goto out; | |
1821 | } | |
1822 | ||
1da177e4 | 1823 | mod->mkobj.mod = mod; |
e17e0f51 | 1824 | |
ac3c8141 GKH |
1825 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1826 | mod->mkobj.kobj.kset = module_kset; | |
1827 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1828 | "%s", mod->name); | |
1829 | if (err) | |
942e4431 | 1830 | mod_kobject_put(mod); |
270a6c4c | 1831 | |
97c146ef | 1832 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1833 | out: |
1834 | return err; | |
1835 | } | |
1836 | ||
6407ebb2 | 1837 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1838 | const struct load_info *info, |
270a6c4c KS |
1839 | struct kernel_param *kparam, |
1840 | unsigned int num_params) | |
1841 | { | |
1842 | int err; | |
1843 | ||
80a3d1bb RR |
1844 | err = mod_sysfs_init(mod); |
1845 | if (err) | |
1846 | goto out; | |
1847 | ||
4ff6abff | 1848 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1849 | if (!mod->holders_dir) { |
1850 | err = -ENOMEM; | |
270a6c4c | 1851 | goto out_unreg; |
240936e1 | 1852 | } |
270a6c4c | 1853 | |
1da177e4 LT |
1854 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1855 | if (err) | |
270a6c4c | 1856 | goto out_unreg_holders; |
1da177e4 | 1857 | |
c988d2b2 MD |
1858 | err = module_add_modinfo_attrs(mod); |
1859 | if (err) | |
e17e0f51 | 1860 | goto out_unreg_param; |
c988d2b2 | 1861 | |
1ba5c08b CL |
1862 | err = add_usage_links(mod); |
1863 | if (err) | |
1864 | goto out_unreg_modinfo_attrs; | |
1865 | ||
8f6d0378 RR |
1866 | add_sect_attrs(mod, info); |
1867 | add_notes_attrs(mod, info); | |
80a3d1bb | 1868 | |
e17e0f51 | 1869 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1870 | return 0; |
1871 | ||
1ba5c08b | 1872 | out_unreg_modinfo_attrs: |
bc6f2a75 | 1873 | module_remove_modinfo_attrs(mod, -1); |
e17e0f51 KS |
1874 | out_unreg_param: |
1875 | module_param_sysfs_remove(mod); | |
270a6c4c | 1876 | out_unreg_holders: |
78a2d906 | 1877 | kobject_put(mod->holders_dir); |
270a6c4c | 1878 | out_unreg: |
942e4431 | 1879 | mod_kobject_put(mod); |
80a3d1bb | 1880 | out: |
1da177e4 LT |
1881 | return err; |
1882 | } | |
34e4e2fe DL |
1883 | |
1884 | static void mod_sysfs_fini(struct module *mod) | |
1885 | { | |
8f6d0378 RR |
1886 | remove_notes_attrs(mod); |
1887 | remove_sect_attrs(mod); | |
942e4431 | 1888 | mod_kobject_put(mod); |
34e4e2fe DL |
1889 | } |
1890 | ||
cf2fde7b RR |
1891 | static void init_param_lock(struct module *mod) |
1892 | { | |
1893 | mutex_init(&mod->param_lock); | |
1894 | } | |
8f6d0378 | 1895 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1896 | |
8f6d0378 RR |
1897 | static int mod_sysfs_setup(struct module *mod, |
1898 | const struct load_info *info, | |
6407ebb2 RR |
1899 | struct kernel_param *kparam, |
1900 | unsigned int num_params) | |
1901 | { | |
1902 | return 0; | |
1903 | } | |
1904 | ||
34e4e2fe DL |
1905 | static void mod_sysfs_fini(struct module *mod) |
1906 | { | |
1907 | } | |
1908 | ||
bc6f2a75 | 1909 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
36b0360d RR |
1910 | { |
1911 | } | |
1912 | ||
80a3d1bb RR |
1913 | static void del_usage_links(struct module *mod) |
1914 | { | |
1915 | } | |
1916 | ||
cf2fde7b RR |
1917 | static void init_param_lock(struct module *mod) |
1918 | { | |
1919 | } | |
34e4e2fe | 1920 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1921 | |
36b0360d | 1922 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1923 | { |
80a3d1bb | 1924 | del_usage_links(mod); |
bc6f2a75 | 1925 | module_remove_modinfo_attrs(mod, -1); |
1da177e4 | 1926 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1927 | kobject_put(mod->mkobj.drivers_dir); |
1928 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1929 | mod_sysfs_fini(mod); |
1da177e4 LT |
1930 | } |
1931 | ||
93651f80 | 1932 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb | 1933 | /* |
1934 | * LKM RO/NX protection: protect module's text/ro-data | |
1935 | * from modification and any data from execution. | |
85c898db RR |
1936 | * |
1937 | * General layout of module is: | |
444d13ff JY |
1938 | * [text] [read-only-data] [ro-after-init] [writable data] |
1939 | * text_size -----^ ^ ^ ^ | |
1940 | * ro_size ------------------------| | | | |
1941 | * ro_after_init_size -----------------------------| | | |
1942 | * size -----------------------------------------------------------| | |
85c898db RR |
1943 | * |
1944 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1945 | */ |
85c898db RR |
1946 | static void frob_text(const struct module_layout *layout, |
1947 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1948 | { |
85c898db RR |
1949 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1950 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1951 | set_memory((unsigned long)layout->base, | |
1952 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1953 | } |
84e1c6bb | 1954 | |
93651f80 | 1955 | #ifdef CONFIG_STRICT_MODULE_RWX |
85c898db RR |
1956 | static void frob_rodata(const struct module_layout *layout, |
1957 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1958 | { |
85c898db RR |
1959 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1960 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1961 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1962 | set_memory((unsigned long)layout->base + layout->text_size, | |
1963 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb | 1964 | } |
1965 | ||
444d13ff JY |
1966 | static void frob_ro_after_init(const struct module_layout *layout, |
1967 | int (*set_memory)(unsigned long start, int num_pages)) | |
1968 | { | |
1969 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1970 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1971 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1972 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1973 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1974 | } | |
1975 | ||
85c898db RR |
1976 | static void frob_writable_data(const struct module_layout *layout, |
1977 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1978 | { |
85c898db | 1979 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1980 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1981 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1982 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1983 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1984 | } |
84e1c6bb | 1985 | |
85c898db RR |
1986 | /* livepatching wants to disable read-only so it can frob module. */ |
1987 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1988 | { |
39290b38 AT |
1989 | if (!rodata_enabled) |
1990 | return; | |
1991 | ||
85c898db RR |
1992 | frob_text(&mod->core_layout, set_memory_rw); |
1993 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 1994 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
1995 | frob_text(&mod->init_layout, set_memory_rw); |
1996 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1997 | } |
84e1c6bb | 1998 | |
444d13ff | 1999 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 2000 | { |
39290b38 AT |
2001 | if (!rodata_enabled) |
2002 | return; | |
2003 | ||
1a7b7d92 RE |
2004 | set_vm_flush_reset_perms(mod->core_layout.base); |
2005 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 2006 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 2007 | |
85c898db RR |
2008 | frob_rodata(&mod->core_layout, set_memory_ro); |
2009 | frob_text(&mod->init_layout, set_memory_ro); | |
2010 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
2011 | |
2012 | if (after_init) | |
2013 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb | 2014 | } |
2015 | ||
85c898db | 2016 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 2017 | { |
85c898db | 2018 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 2019 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
2020 | frob_writable_data(&mod->core_layout, set_memory_nx); |
2021 | frob_rodata(&mod->init_layout, set_memory_nx); | |
2022 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
2023 | } |
2024 | ||
84e1c6bb | 2025 | /* Iterate through all modules and set each module's text as RW */ |
5d05c708 | 2026 | void set_all_modules_text_rw(void) |
84e1c6bb | 2027 | { |
2028 | struct module *mod; | |
2029 | ||
39290b38 AT |
2030 | if (!rodata_enabled) |
2031 | return; | |
2032 | ||
84e1c6bb | 2033 | mutex_lock(&module_mutex); |
2034 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
2035 | if (mod->state == MODULE_STATE_UNFORMED) |
2036 | continue; | |
85c898db RR |
2037 | |
2038 | frob_text(&mod->core_layout, set_memory_rw); | |
2039 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb | 2040 | } |
2041 | mutex_unlock(&module_mutex); | |
2042 | } | |
2043 | ||
2044 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 2045 | void set_all_modules_text_ro(void) |
84e1c6bb | 2046 | { |
2047 | struct module *mod; | |
2048 | ||
39290b38 AT |
2049 | if (!rodata_enabled) |
2050 | return; | |
2051 | ||
84e1c6bb | 2052 | mutex_lock(&module_mutex); |
2053 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
2054 | /* |
2055 | * Ignore going modules since it's possible that ro | |
2056 | * protection has already been disabled, otherwise we'll | |
2057 | * run into protection faults at module deallocation. | |
2058 | */ | |
2059 | if (mod->state == MODULE_STATE_UNFORMED || | |
2060 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 2061 | continue; |
85c898db RR |
2062 | |
2063 | frob_text(&mod->core_layout, set_memory_ro); | |
2064 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb | 2065 | } |
2066 | mutex_unlock(&module_mutex); | |
2067 | } | |
93651f80 | 2068 | #else /* !CONFIG_STRICT_MODULE_RWX */ |
85c898db | 2069 | static void module_enable_nx(const struct module *mod) { } |
93651f80 | 2070 | #endif /* CONFIG_STRICT_MODULE_RWX */ |
2eef1399 YY |
2071 | static void module_enable_x(const struct module *mod) |
2072 | { | |
2073 | frob_text(&mod->core_layout, set_memory_x); | |
2074 | frob_text(&mod->init_layout, set_memory_x); | |
2075 | } | |
93651f80 YY |
2076 | #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ |
2077 | static void module_enable_nx(const struct module *mod) { } | |
2078 | static void module_enable_x(const struct module *mod) { } | |
2079 | #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
2080 | ||
84e1c6bb | 2081 | |
1ce15ef4 JY |
2082 | #ifdef CONFIG_LIVEPATCH |
2083 | /* | |
2084 | * Persist Elf information about a module. Copy the Elf header, | |
2085 | * section header table, section string table, and symtab section | |
2086 | * index from info to mod->klp_info. | |
2087 | */ | |
2088 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2089 | { | |
2090 | unsigned int size, symndx; | |
2091 | int ret; | |
2092 | ||
2093 | size = sizeof(*mod->klp_info); | |
2094 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2095 | if (mod->klp_info == NULL) | |
2096 | return -ENOMEM; | |
2097 | ||
2098 | /* Elf header */ | |
2099 | size = sizeof(mod->klp_info->hdr); | |
2100 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2101 | ||
2102 | /* Elf section header table */ | |
2103 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2104 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2105 | if (mod->klp_info->sechdrs == NULL) { |
2106 | ret = -ENOMEM; | |
2107 | goto free_info; | |
2108 | } | |
1ce15ef4 JY |
2109 | |
2110 | /* Elf section name string table */ | |
2111 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2112 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2113 | if (mod->klp_info->secstrings == NULL) { |
2114 | ret = -ENOMEM; | |
2115 | goto free_sechdrs; | |
2116 | } | |
1ce15ef4 JY |
2117 | |
2118 | /* Elf symbol section index */ | |
2119 | symndx = info->index.sym; | |
2120 | mod->klp_info->symndx = symndx; | |
2121 | ||
2122 | /* | |
2123 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2124 | * copy of the original symbol table. Adjust sh_addr to point | |
2125 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2126 | * init memory is freed at the end of do_init_module(). | |
2127 | */ | |
2128 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2129 | (unsigned long) mod->core_kallsyms.symtab; | |
2130 | ||
2131 | return 0; | |
2132 | ||
2133 | free_sechdrs: | |
2134 | kfree(mod->klp_info->sechdrs); | |
2135 | free_info: | |
2136 | kfree(mod->klp_info); | |
2137 | return ret; | |
2138 | } | |
2139 | ||
2140 | static void free_module_elf(struct module *mod) | |
2141 | { | |
2142 | kfree(mod->klp_info->sechdrs); | |
2143 | kfree(mod->klp_info->secstrings); | |
2144 | kfree(mod->klp_info); | |
2145 | } | |
2146 | #else /* !CONFIG_LIVEPATCH */ | |
2147 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2148 | { | |
2149 | return 0; | |
2150 | } | |
2151 | ||
2152 | static void free_module_elf(struct module *mod) | |
2153 | { | |
2154 | } | |
2155 | #endif /* CONFIG_LIVEPATCH */ | |
2156 | ||
be1f221c | 2157 | void __weak module_memfree(void *module_region) |
74e08fcf | 2158 | { |
1a7b7d92 RE |
2159 | /* |
2160 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2161 | * supported by vmalloc. | |
2162 | */ | |
2163 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2164 | vfree(module_region); |
2165 | } | |
2166 | ||
2167 | void __weak module_arch_cleanup(struct module *mod) | |
2168 | { | |
2169 | } | |
2170 | ||
d453cded RR |
2171 | void __weak module_arch_freeing_init(struct module *mod) |
2172 | { | |
2173 | } | |
2174 | ||
75676500 | 2175 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2176 | static void free_module(struct module *mod) |
2177 | { | |
7ead8b83 LZ |
2178 | trace_module_free(mod); |
2179 | ||
36b0360d | 2180 | mod_sysfs_teardown(mod); |
1da177e4 | 2181 | |
944a1fa0 RR |
2182 | /* We leave it in list to prevent duplicate loads, but make sure |
2183 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2184 | mutex_lock(&module_mutex); |
944a1fa0 | 2185 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2186 | mutex_unlock(&module_mutex); |
944a1fa0 | 2187 | |
b82bab4b JB |
2188 | /* Remove dynamic debug info */ |
2189 | ddebug_remove_module(mod->name); | |
2190 | ||
1da177e4 LT |
2191 | /* Arch-specific cleanup. */ |
2192 | module_arch_cleanup(mod); | |
2193 | ||
2194 | /* Module unload stuff */ | |
2195 | module_unload_free(mod); | |
2196 | ||
e180a6b7 RR |
2197 | /* Free any allocated parameters. */ |
2198 | destroy_params(mod->kp, mod->num_kp); | |
2199 | ||
1ce15ef4 JY |
2200 | if (is_livepatch_module(mod)) |
2201 | free_module_elf(mod); | |
2202 | ||
944a1fa0 RR |
2203 | /* Now we can delete it from the lists */ |
2204 | mutex_lock(&module_mutex); | |
461e34ae MH |
2205 | /* Unlink carefully: kallsyms could be walking list. */ |
2206 | list_del_rcu(&mod->list); | |
93c2e105 | 2207 | mod_tree_remove(mod); |
0286b5ea | 2208 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2209 | module_bug_cleanup(mod); |
0be964be | 2210 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2211 | synchronize_rcu(); |
944a1fa0 RR |
2212 | mutex_unlock(&module_mutex); |
2213 | ||
85c898db | 2214 | /* This may be empty, but that's OK */ |
d453cded | 2215 | module_arch_freeing_init(mod); |
7523e4dc | 2216 | module_memfree(mod->init_layout.base); |
1da177e4 | 2217 | kfree(mod->args); |
259354de | 2218 | percpu_modfree(mod); |
9f85a4bb | 2219 | |
35a9393c | 2220 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2221 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2222 | |
1da177e4 | 2223 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2224 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2225 | } |
2226 | ||
2227 | void *__symbol_get(const char *symbol) | |
2228 | { | |
2229 | struct module *owner; | |
414fd31b | 2230 | const struct kernel_symbol *sym; |
1da177e4 | 2231 | |
24da1cbf | 2232 | preempt_disable(); |
414fd31b TA |
2233 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2234 | if (sym && strong_try_module_get(owner)) | |
2235 | sym = NULL; | |
24da1cbf | 2236 | preempt_enable(); |
1da177e4 | 2237 | |
7290d580 | 2238 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2239 | } |
2240 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2241 | ||
eea8b54d AN |
2242 | /* |
2243 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2244 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2245 | * |
2246 | * You must hold the module_mutex. | |
eea8b54d | 2247 | */ |
2d25bc55 | 2248 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2249 | { |
b211104d | 2250 | unsigned int i; |
eea8b54d | 2251 | struct module *owner; |
b211104d RR |
2252 | const struct kernel_symbol *s; |
2253 | struct { | |
2254 | const struct kernel_symbol *sym; | |
2255 | unsigned int num; | |
2256 | } arr[] = { | |
2257 | { mod->syms, mod->num_syms }, | |
2258 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2259 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2260 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2261 | { mod->unused_syms, mod->num_unused_syms }, |
2262 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2263 | #endif |
b211104d | 2264 | }; |
eea8b54d | 2265 | |
b211104d RR |
2266 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2267 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 AB |
2268 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
2269 | true, false)) { | |
bddb12b3 | 2270 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2271 | " (owned by %s)\n", |
7290d580 AB |
2272 | mod->name, kernel_symbol_name(s), |
2273 | module_name(owner)); | |
b211104d RR |
2274 | return -ENOEXEC; |
2275 | } | |
eea8b54d | 2276 | } |
b211104d RR |
2277 | } |
2278 | return 0; | |
eea8b54d AN |
2279 | } |
2280 | ||
9a4b9708 | 2281 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2282 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2283 | { | |
2284 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2285 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2286 | unsigned long secbase; |
49668688 | 2287 | unsigned int i; |
1da177e4 | 2288 | int ret = 0; |
414fd31b | 2289 | const struct kernel_symbol *ksym; |
1da177e4 | 2290 | |
49668688 RR |
2291 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2292 | const char *name = info->strtab + sym[i].st_name; | |
2293 | ||
1da177e4 LT |
2294 | switch (sym[i].st_shndx) { |
2295 | case SHN_COMMON: | |
80375980 JM |
2296 | /* Ignore common symbols */ |
2297 | if (!strncmp(name, "__gnu_lto", 9)) | |
2298 | break; | |
2299 | ||
1da177e4 LT |
2300 | /* We compiled with -fno-common. These are not |
2301 | supposed to happen. */ | |
5e124169 | 2302 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2303 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2304 | mod->name); |
2305 | ret = -ENOEXEC; | |
2306 | break; | |
2307 | ||
2308 | case SHN_ABS: | |
2309 | /* Don't need to do anything */ | |
5e124169 | 2310 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2311 | (long)sym[i].st_value); |
2312 | break; | |
2313 | ||
1ce15ef4 JY |
2314 | case SHN_LIVEPATCH: |
2315 | /* Livepatch symbols are resolved by livepatch */ | |
2316 | break; | |
2317 | ||
1da177e4 | 2318 | case SHN_UNDEF: |
49668688 | 2319 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2320 | /* Ok if resolved. */ |
9bea7f23 | 2321 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2322 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2323 | break; |
414fd31b TA |
2324 | } |
2325 | ||
1da177e4 | 2326 | /* Ok if weak. */ |
9bea7f23 | 2327 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2328 | break; |
2329 | ||
9bea7f23 | 2330 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2331 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2332 | mod->name, name, ret); | |
1da177e4 LT |
2333 | break; |
2334 | ||
2335 | default: | |
2336 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2337 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2338 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2339 | else |
49668688 | 2340 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2341 | sym[i].st_value += secbase; |
2342 | break; | |
2343 | } | |
2344 | } | |
2345 | ||
2346 | return ret; | |
2347 | } | |
2348 | ||
49668688 | 2349 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2350 | { |
2351 | unsigned int i; | |
2352 | int err = 0; | |
2353 | ||
2354 | /* Now do relocations. */ | |
49668688 RR |
2355 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2356 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2357 | |
2358 | /* Not a valid relocation section? */ | |
49668688 | 2359 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2360 | continue; |
2361 | ||
2362 | /* Don't bother with non-allocated sections */ | |
49668688 | 2363 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2364 | continue; |
2365 | ||
1ce15ef4 JY |
2366 | /* Livepatch relocation sections are applied by livepatch */ |
2367 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2368 | continue; | |
2369 | ||
49668688 RR |
2370 | if (info->sechdrs[i].sh_type == SHT_REL) |
2371 | err = apply_relocate(info->sechdrs, info->strtab, | |
2372 | info->index.sym, i, mod); | |
2373 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2374 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2375 | info->index.sym, i, mod); | |
22e268eb RR |
2376 | if (err < 0) |
2377 | break; | |
2378 | } | |
2379 | return err; | |
2380 | } | |
2381 | ||
088af9a6 HD |
2382 | /* Additional bytes needed by arch in front of individual sections */ |
2383 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2384 | unsigned int section) | |
2385 | { | |
2386 | /* default implementation just returns zero */ | |
2387 | return 0; | |
2388 | } | |
2389 | ||
1da177e4 | 2390 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2391 | static long get_offset(struct module *mod, unsigned int *size, |
2392 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2393 | { |
2394 | long ret; | |
2395 | ||
088af9a6 | 2396 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2397 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2398 | *size = ret + sechdr->sh_size; | |
2399 | return ret; | |
2400 | } | |
2401 | ||
2402 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2403 | might -- code, read-only data, read-write data, small data. Tally | |
2404 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2405 | belongs in init. */ | |
49668688 | 2406 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2407 | { |
2408 | static unsigned long const masks[][2] = { | |
2409 | /* NOTE: all executable code must be the first section | |
2410 | * in this array; otherwise modify the text_size | |
2411 | * finder in the two loops below */ | |
2412 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2413 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2414 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2415 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2416 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2417 | }; | |
2418 | unsigned int m, i; | |
2419 | ||
49668688 RR |
2420 | for (i = 0; i < info->hdr->e_shnum; i++) |
2421 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2422 | |
5e124169 | 2423 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2424 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2425 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2426 | Elf_Shdr *s = &info->sechdrs[i]; | |
2427 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2428 | |
2429 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2430 | || (s->sh_flags & masks[m][1]) | |
2431 | || s->sh_entsize != ~0UL | |
49668688 | 2432 | || strstarts(sname, ".init")) |
1da177e4 | 2433 | continue; |
7523e4dc | 2434 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2435 | pr_debug("\t%s\n", sname); |
1da177e4 | 2436 | } |
84e1c6bb | 2437 | switch (m) { |
2438 | case 0: /* executable */ | |
7523e4dc RR |
2439 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2440 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb | 2441 | break; |
2442 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2443 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2444 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2445 | break; |
444d13ff JY |
2446 | case 2: /* RO after init */ |
2447 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2448 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2449 | break; | |
2450 | case 4: /* whole core */ | |
7523e4dc | 2451 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb | 2452 | break; |
2453 | } | |
1da177e4 LT |
2454 | } |
2455 | ||
5e124169 | 2456 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2457 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2458 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2459 | Elf_Shdr *s = &info->sechdrs[i]; | |
2460 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2461 | |
2462 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2463 | || (s->sh_flags & masks[m][1]) | |
2464 | || s->sh_entsize != ~0UL | |
49668688 | 2465 | || !strstarts(sname, ".init")) |
1da177e4 | 2466 | continue; |
7523e4dc | 2467 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2468 | | INIT_OFFSET_MASK); |
5e124169 | 2469 | pr_debug("\t%s\n", sname); |
1da177e4 | 2470 | } |
84e1c6bb | 2471 | switch (m) { |
2472 | case 0: /* executable */ | |
7523e4dc RR |
2473 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2474 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb | 2475 | break; |
2476 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2477 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2478 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2479 | break; |
444d13ff JY |
2480 | case 2: |
2481 | /* | |
2482 | * RO after init doesn't apply to init_layout (only | |
2483 | * core_layout), so it just takes the value of ro_size. | |
2484 | */ | |
2485 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2486 | break; | |
2487 | case 4: /* whole init */ | |
7523e4dc | 2488 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb | 2489 | break; |
2490 | } | |
1da177e4 LT |
2491 | } |
2492 | } | |
2493 | ||
1da177e4 LT |
2494 | static void set_license(struct module *mod, const char *license) |
2495 | { | |
2496 | if (!license) | |
2497 | license = "unspecified"; | |
2498 | ||
fa3ba2e8 | 2499 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2500 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2501 | pr_warn("%s: module license '%s' taints kernel.\n", |
2502 | mod->name, license); | |
373d4d09 RR |
2503 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2504 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2505 | } |
2506 | } | |
2507 | ||
2508 | /* Parse tag=value strings from .modinfo section */ | |
2509 | static char *next_string(char *string, unsigned long *secsize) | |
2510 | { | |
2511 | /* Skip non-zero chars */ | |
2512 | while (string[0]) { | |
2513 | string++; | |
2514 | if ((*secsize)-- <= 1) | |
2515 | return NULL; | |
2516 | } | |
2517 | ||
2518 | /* Skip any zero padding. */ | |
2519 | while (!string[0]) { | |
2520 | string++; | |
2521 | if ((*secsize)-- <= 1) | |
2522 | return NULL; | |
2523 | } | |
2524 | return string; | |
2525 | } | |
2526 | ||
c5e4a062 MM |
2527 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
2528 | char *prev) | |
1da177e4 LT |
2529 | { |
2530 | char *p; | |
2531 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2532 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2533 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2534 | |
5fdc7db6 JY |
2535 | /* |
2536 | * get_modinfo() calls made before rewrite_section_headers() | |
2537 | * must use sh_offset, as sh_addr isn't set! | |
2538 | */ | |
c5e4a062 MM |
2539 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
2540 | ||
2541 | if (prev) { | |
2542 | size -= prev - modinfo; | |
2543 | modinfo = next_string(prev, &size); | |
2544 | } | |
2545 | ||
2546 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2547 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2548 | return p + taglen + 1; | |
2549 | } | |
2550 | return NULL; | |
2551 | } | |
2552 | ||
c5e4a062 MM |
2553 | static char *get_modinfo(const struct load_info *info, const char *tag) |
2554 | { | |
2555 | return get_next_modinfo(info, tag, NULL); | |
2556 | } | |
2557 | ||
49668688 | 2558 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2559 | { |
2560 | struct module_attribute *attr; | |
2561 | int i; | |
2562 | ||
2563 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2564 | if (attr->setup) | |
49668688 | 2565 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2566 | } |
2567 | } | |
c988d2b2 | 2568 | |
a263f776 RR |
2569 | static void free_modinfo(struct module *mod) |
2570 | { | |
2571 | struct module_attribute *attr; | |
2572 | int i; | |
2573 | ||
2574 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2575 | if (attr->free) | |
2576 | attr->free(mod); | |
2577 | } | |
2578 | } | |
2579 | ||
1da177e4 | 2580 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2581 | |
2d25bc55 JY |
2582 | /* Lookup exported symbol in given range of kernel_symbols */ |
2583 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2584 | const struct kernel_symbol *start, | |
2585 | const struct kernel_symbol *stop) | |
15bba37d | 2586 | { |
9d63487f AIB |
2587 | return bsearch(name, start, stop - start, |
2588 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2589 | } |
2590 | ||
ca4787b7 TA |
2591 | static int is_exported(const char *name, unsigned long value, |
2592 | const struct module *mod) | |
1da177e4 | 2593 | { |
ca4787b7 TA |
2594 | const struct kernel_symbol *ks; |
2595 | if (!mod) | |
2d25bc55 | 2596 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2597 | else |
2d25bc55 JY |
2598 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2599 | ||
7290d580 | 2600 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2601 | } |
2602 | ||
2603 | /* As per nm */ | |
eded41c1 | 2604 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2605 | { |
eded41c1 RR |
2606 | const Elf_Shdr *sechdrs = info->sechdrs; |
2607 | ||
1da177e4 LT |
2608 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2609 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2610 | return 'v'; | |
2611 | else | |
2612 | return 'w'; | |
2613 | } | |
2614 | if (sym->st_shndx == SHN_UNDEF) | |
2615 | return 'U'; | |
e0224418 | 2616 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2617 | return 'a'; |
2618 | if (sym->st_shndx >= SHN_LORESERVE) | |
2619 | return '?'; | |
2620 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2621 | return 't'; | |
2622 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2623 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2624 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2625 | return 'r'; | |
2626 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2627 | return 'g'; | |
2628 | else | |
2629 | return 'd'; | |
2630 | } | |
2631 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2632 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2633 | return 's'; | |
2634 | else | |
2635 | return 'b'; | |
2636 | } | |
eded41c1 RR |
2637 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2638 | ".debug")) { | |
1da177e4 | 2639 | return 'n'; |
eded41c1 | 2640 | } |
1da177e4 LT |
2641 | return '?'; |
2642 | } | |
2643 | ||
4a496226 | 2644 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2645 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2646 | { |
2647 | const Elf_Shdr *sec; | |
2648 | ||
2649 | if (src->st_shndx == SHN_UNDEF | |
2650 | || src->st_shndx >= shnum | |
2651 | || !src->st_name) | |
2652 | return false; | |
2653 | ||
e0224418 MB |
2654 | #ifdef CONFIG_KALLSYMS_ALL |
2655 | if (src->st_shndx == pcpundx) | |
2656 | return true; | |
2657 | #endif | |
2658 | ||
4a496226 JB |
2659 | sec = sechdrs + src->st_shndx; |
2660 | if (!(sec->sh_flags & SHF_ALLOC) | |
2661 | #ifndef CONFIG_KALLSYMS_ALL | |
2662 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2663 | #endif | |
2664 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2665 | return false; | |
2666 | ||
2667 | return true; | |
2668 | } | |
2669 | ||
48fd1188 KC |
2670 | /* |
2671 | * We only allocate and copy the strings needed by the parts of symtab | |
2672 | * we keep. This is simple, but has the effect of making multiple | |
2673 | * copies of duplicates. We could be more sophisticated, see | |
2674 | * linux-kernel thread starting with | |
2675 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2676 | */ | |
49668688 | 2677 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2678 | { |
49668688 RR |
2679 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2680 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2681 | const Elf_Sym *src; |
54523ec7 | 2682 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2683 | |
2684 | /* Put symbol section at end of init part of module. */ | |
2685 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2686 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2687 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2688 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2689 | |
49668688 | 2690 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2691 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2692 | |
48fd1188 | 2693 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2694 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2695 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2696 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2697 | info->index.pcpu)) { | |
59ef28b1 | 2698 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2699 | ndst++; |
554bdfe5 | 2700 | } |
59ef28b1 | 2701 | } |
4a496226 JB |
2702 | |
2703 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2704 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2705 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2706 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2707 | info->core_typeoffs = mod->core_layout.size; |
2708 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2709 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2710 | |
554bdfe5 JB |
2711 | /* Put string table section at end of init part of module. */ |
2712 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2713 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2714 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2715 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2716 | |
2717 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2718 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2719 | __alignof__(struct mod_kallsyms)); | |
2720 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2721 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2722 | info->init_typeoffs = mod->init_layout.size; |
2723 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2724 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2725 | } |
2726 | ||
8244062e RR |
2727 | /* |
2728 | * We use the full symtab and strtab which layout_symtab arranged to | |
2729 | * be appended to the init section. Later we switch to the cut-down | |
2730 | * core-only ones. | |
2731 | */ | |
811d66a0 | 2732 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2733 | { |
4a496226 JB |
2734 | unsigned int i, ndst; |
2735 | const Elf_Sym *src; | |
2736 | Elf_Sym *dst; | |
554bdfe5 | 2737 | char *s; |
eded41c1 | 2738 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2739 | |
8244062e RR |
2740 | /* Set up to point into init section. */ |
2741 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2742 | ||
2743 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2744 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2745 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2746 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2747 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2748 | |
1c7651f4 EL |
2749 | /* |
2750 | * Now populate the cut down core kallsyms for after init | |
2751 | * and set types up while we still have access to sections. | |
2752 | */ | |
8244062e RR |
2753 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2754 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2755 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2756 | src = mod->kallsyms->symtab; |
2757 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2758 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2759 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2760 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2761 | info->index.pcpu)) { | |
1c7651f4 EL |
2762 | mod->core_kallsyms.typetab[ndst] = |
2763 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2764 | dst[ndst] = src[i]; |
8244062e RR |
2765 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2766 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2767 | KSYM_NAME_LEN) + 1; |
2768 | } | |
4a496226 | 2769 | } |
8244062e | 2770 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2771 | } |
2772 | #else | |
49668688 | 2773 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2774 | { |
2775 | } | |
3ae91c21 | 2776 | |
abbce906 | 2777 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2778 | { |
2779 | } | |
2780 | #endif /* CONFIG_KALLSYMS */ | |
2781 | ||
52796312 | 2782 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2783 | { |
811d66a0 RR |
2784 | if (!debug) |
2785 | return; | |
513770f5 | 2786 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2787 | } |
346e15be | 2788 | |
52796312 | 2789 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2790 | { |
2791 | if (debug) | |
52796312 | 2792 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2793 | } |
2794 | ||
74e08fcf JB |
2795 | void * __weak module_alloc(unsigned long size) |
2796 | { | |
82fab442 | 2797 | return vmalloc_exec(size); |
74e08fcf JB |
2798 | } |
2799 | ||
38b37d63 MS |
2800 | bool __weak module_exit_section(const char *name) |
2801 | { | |
2802 | return strstarts(name, ".exit"); | |
2803 | } | |
2804 | ||
4f2294b6 | 2805 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2806 | static void kmemleak_load_module(const struct module *mod, |
2807 | const struct load_info *info) | |
4f2294b6 CM |
2808 | { |
2809 | unsigned int i; | |
2810 | ||
2811 | /* only scan the sections containing data */ | |
c017b4be | 2812 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2813 | |
49668688 | 2814 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2815 | /* Scan all writable sections that's not executable */ |
2816 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2817 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2818 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2819 | continue; |
2820 | ||
49668688 RR |
2821 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2822 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2823 | } |
2824 | } | |
2825 | #else | |
49668688 RR |
2826 | static inline void kmemleak_load_module(const struct module *mod, |
2827 | const struct load_info *info) | |
4f2294b6 CM |
2828 | { |
2829 | } | |
2830 | #endif | |
2831 | ||
106a4ee2 | 2832 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2833 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2834 | { |
2835 | int err = -ENOKEY; | |
34e1169d KC |
2836 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2837 | const void *mod = info->hdr; | |
caabe240 | 2838 | |
bca014ca BH |
2839 | /* |
2840 | * Require flags == 0, as a module with version information | |
2841 | * removed is no longer the module that was signed | |
2842 | */ | |
2843 | if (flags == 0 && | |
2844 | info->len > markerlen && | |
34e1169d | 2845 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2846 | /* We truncate the module to discard the signature */ |
34e1169d | 2847 | info->len -= markerlen; |
f314dfea | 2848 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2849 | } |
2850 | ||
2851 | if (!err) { | |
2852 | info->sig_ok = true; | |
2853 | return 0; | |
2854 | } | |
2855 | ||
2856 | /* Not having a signature is only an error if we're strict. */ | |
2c8fd268 | 2857 | if (err == -ENOKEY && !is_module_sig_enforced()) |
106a4ee2 RR |
2858 | err = 0; |
2859 | ||
2860 | return err; | |
2861 | } | |
2862 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2863 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2864 | { |
2865 | return 0; | |
2866 | } | |
2867 | #endif /* !CONFIG_MODULE_SIG */ | |
2868 | ||
34e1169d KC |
2869 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2870 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2871 | { |
34e1169d KC |
2872 | if (info->len < sizeof(*(info->hdr))) |
2873 | return -ENOEXEC; | |
2874 | ||
2875 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2876 | || info->hdr->e_type != ET_REL | |
2877 | || !elf_check_arch(info->hdr) | |
2878 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2879 | return -ENOEXEC; | |
2880 | ||
2881 | if (info->hdr->e_shoff >= info->len | |
2882 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2883 | info->len - info->hdr->e_shoff)) | |
2884 | return -ENOEXEC; | |
40dd2560 | 2885 | |
34e1169d KC |
2886 | return 0; |
2887 | } | |
2888 | ||
3afe9f84 LT |
2889 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2890 | ||
2891 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2892 | { | |
2893 | do { | |
2894 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2895 | ||
2896 | if (copy_from_user(dst, usrc, n) != 0) | |
2897 | return -EFAULT; | |
2898 | cond_resched(); | |
2899 | dst += n; | |
2900 | usrc += n; | |
2901 | len -= n; | |
2902 | } while (len); | |
2903 | return 0; | |
2904 | } | |
2905 | ||
1ce15ef4 | 2906 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2907 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2908 | { |
2992ef29 JP |
2909 | if (get_modinfo(info, "livepatch")) { |
2910 | mod->klp = true; | |
2911 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2912 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2913 | mod->name); | |
2992ef29 | 2914 | } |
1ce15ef4 JY |
2915 | |
2916 | return 0; | |
2917 | } | |
2918 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2919 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2920 | { |
2921 | if (get_modinfo(info, "livepatch")) { | |
2922 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2923 | mod->name); | |
2924 | return -ENOEXEC; | |
2925 | } | |
2926 | ||
2927 | return 0; | |
2928 | } | |
2929 | #endif /* CONFIG_LIVEPATCH */ | |
2930 | ||
caf7501a AK |
2931 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2932 | { | |
2933 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2934 | return; | |
2935 | ||
2936 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2937 | mod->name); | |
2938 | } | |
2939 | ||
34e1169d KC |
2940 | /* Sets info->hdr and info->len. */ |
2941 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2942 | struct load_info *info) | |
40dd2560 RR |
2943 | { |
2944 | int err; | |
40dd2560 | 2945 | |
34e1169d KC |
2946 | info->len = len; |
2947 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2948 | return -ENOEXEC; |
2949 | ||
c77b8cdf | 2950 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2951 | if (err) |
2952 | return err; | |
2953 | ||
40dd2560 | 2954 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2955 | info->hdr = __vmalloc(info->len, |
19809c2d | 2956 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2957 | if (!info->hdr) |
40dd2560 RR |
2958 | return -ENOMEM; |
2959 | ||
3afe9f84 | 2960 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2961 | vfree(info->hdr); |
2962 | return -EFAULT; | |
40dd2560 RR |
2963 | } |
2964 | ||
34e1169d KC |
2965 | return 0; |
2966 | } | |
2967 | ||
d913188c RR |
2968 | static void free_copy(struct load_info *info) |
2969 | { | |
d913188c RR |
2970 | vfree(info->hdr); |
2971 | } | |
2972 | ||
2f3238ae | 2973 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2974 | { |
2975 | unsigned int i; | |
2976 | ||
2977 | /* This should always be true, but let's be sure. */ | |
2978 | info->sechdrs[0].sh_addr = 0; | |
2979 | ||
2980 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2981 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2982 | if (shdr->sh_type != SHT_NOBITS | |
2983 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2984 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2985 | return -ENOEXEC; |
2986 | } | |
2987 | ||
2988 | /* Mark all sections sh_addr with their address in the | |
2989 | temporary image. */ | |
2990 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2991 | ||
2992 | #ifndef CONFIG_MODULE_UNLOAD | |
2993 | /* Don't load .exit sections */ | |
38b37d63 | 2994 | if (module_exit_section(info->secstrings+shdr->sh_name)) |
8b5f61a7 RR |
2995 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; |
2996 | #endif | |
8b5f61a7 | 2997 | } |
d6df72a0 RR |
2998 | |
2999 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 3000 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 3001 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 3002 | |
8b5f61a7 RR |
3003 | return 0; |
3004 | } | |
3005 | ||
3264d3f9 LT |
3006 | /* |
3007 | * Set up our basic convenience variables (pointers to section headers, | |
3008 | * search for module section index etc), and do some basic section | |
3009 | * verification. | |
3010 | * | |
81a0abd9 JY |
3011 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
3012 | * will be allocated in move_module(). | |
3264d3f9 | 3013 | */ |
81a0abd9 | 3014 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
3015 | { |
3016 | unsigned int i; | |
3264d3f9 LT |
3017 | |
3018 | /* Set up the convenience variables */ | |
3019 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
3020 | info->secstrings = (void *)info->hdr |
3021 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 3022 | |
5fdc7db6 JY |
3023 | /* Try to find a name early so we can log errors with a module name */ |
3024 | info->index.info = find_sec(info, ".modinfo"); | |
3025 | if (!info->index.info) | |
3026 | info->name = "(missing .modinfo section)"; | |
3027 | else | |
3028 | info->name = get_modinfo(info, "name"); | |
3264d3f9 | 3029 | |
8b5f61a7 RR |
3030 | /* Find internal symbols and strings. */ |
3031 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
3032 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
3033 | info->index.sym = i; | |
3034 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
3035 | info->strtab = (char *)info->hdr |
3036 | + info->sechdrs[info->index.str].sh_offset; | |
3037 | break; | |
3264d3f9 | 3038 | } |
3264d3f9 LT |
3039 | } |
3040 | ||
5fdc7db6 JY |
3041 | if (info->index.sym == 0) { |
3042 | pr_warn("%s: module has no symbols (stripped?)\n", info->name); | |
3043 | return -ENOEXEC; | |
3044 | } | |
3045 | ||
49668688 | 3046 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 3047 | if (!info->index.mod) { |
3e2e857f KC |
3048 | pr_warn("%s: No module found in object\n", |
3049 | info->name ?: "(missing .modinfo name field)"); | |
81a0abd9 | 3050 | return -ENOEXEC; |
3264d3f9 LT |
3051 | } |
3052 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 3053 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 3054 | |
3e2e857f | 3055 | /* |
5fdc7db6 | 3056 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
3057 | * on-disk struct mod 'name' field. |
3058 | */ | |
3059 | if (!info->name) | |
81a0abd9 | 3060 | info->name = info->mod->name; |
3e2e857f | 3061 | |
5fdc7db6 JY |
3062 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
3063 | info->index.vers = 0; /* Pretend no __versions section! */ | |
3064 | else | |
3065 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 3066 | |
49668688 | 3067 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3068 | |
81a0abd9 | 3069 | return 0; |
3264d3f9 LT |
3070 | } |
3071 | ||
2f3238ae | 3072 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3073 | { |
49668688 | 3074 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3075 | int err; |
3076 | ||
2f3238ae RR |
3077 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3078 | modmagic = NULL; | |
3079 | ||
40dd2560 RR |
3080 | /* This is allowed: modprobe --force will invalidate it. */ |
3081 | if (!modmagic) { | |
3082 | err = try_to_force_load(mod, "bad vermagic"); | |
3083 | if (err) | |
3084 | return err; | |
49668688 | 3085 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3086 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3087 | info->name, modmagic, vermagic); |
40dd2560 RR |
3088 | return -ENOEXEC; |
3089 | } | |
3090 | ||
3205c36c LP |
3091 | if (!get_modinfo(info, "intree")) { |
3092 | if (!test_taint(TAINT_OOT_MODULE)) | |
3093 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3094 | mod->name); | |
373d4d09 | 3095 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3096 | } |
2449b8ba | 3097 | |
caf7501a AK |
3098 | check_modinfo_retpoline(mod, info); |
3099 | ||
49668688 | 3100 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3101 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3102 | pr_warn("%s: module is from the staging directory, the quality " |
3103 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3104 | } |
22e268eb | 3105 | |
2992ef29 | 3106 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3107 | if (err) |
3108 | return err; | |
3109 | ||
22e268eb | 3110 | /* Set up license info based on the info section */ |
49668688 | 3111 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3112 | |
40dd2560 RR |
3113 | return 0; |
3114 | } | |
3115 | ||
eb3057df | 3116 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3117 | { |
49668688 | 3118 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3119 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3120 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3121 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3122 | mod->crcs = section_addr(info, "__kcrctab"); |
3123 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3124 | sizeof(*mod->gpl_syms), |
3125 | &mod->num_gpl_syms); | |
49668688 RR |
3126 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3127 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3128 | "__ksymtab_gpl_future", |
3129 | sizeof(*mod->gpl_future_syms), | |
3130 | &mod->num_gpl_future_syms); | |
49668688 | 3131 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3132 | |
3133 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3134 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3135 | sizeof(*mod->unused_syms), |
3136 | &mod->num_unused_syms); | |
49668688 RR |
3137 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3138 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3139 | sizeof(*mod->unused_gpl_syms), |
3140 | &mod->num_unused_gpl_syms); | |
49668688 | 3141 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3142 | #endif |
3143 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3144 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3145 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3146 | if (!mod->ctors) |
3147 | mod->ctors = section_objs(info, ".init_array", | |
3148 | sizeof(*mod->ctors), &mod->num_ctors); | |
3149 | else if (find_sec(info, ".init_array")) { | |
3150 | /* | |
3151 | * This shouldn't happen with same compiler and binutils | |
3152 | * building all parts of the module. | |
3153 | */ | |
6da0b565 | 3154 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3155 | mod->name); |
3156 | return -EINVAL; | |
3157 | } | |
f91a13bb LT |
3158 | #endif |
3159 | ||
3160 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3161 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3162 | sizeof(*mod->tracepoints_ptrs), | |
3163 | &mod->num_tracepoints); | |
f91a13bb | 3164 | #endif |
fe15b50c PM |
3165 | #ifdef CONFIG_TREE_SRCU |
3166 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
3167 | sizeof(*mod->srcu_struct_ptrs), | |
3168 | &mod->num_srcu_structs); | |
3169 | #endif | |
a38d1107 MM |
3170 | #ifdef CONFIG_BPF_EVENTS |
3171 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3172 | sizeof(*mod->bpf_raw_events), | |
3173 | &mod->num_bpf_raw_events); | |
3174 | #endif | |
e9666d10 | 3175 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3176 | mod->jump_entries = section_objs(info, "__jump_table", |
3177 | sizeof(*mod->jump_entries), | |
3178 | &mod->num_jump_entries); | |
3179 | #endif | |
f91a13bb | 3180 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3181 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3182 | sizeof(*mod->trace_events), |
3183 | &mod->num_trace_events); | |
99be647c JL |
3184 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3185 | sizeof(*mod->trace_evals), | |
3186 | &mod->num_trace_evals); | |
f91a13bb | 3187 | #endif |
13b9b6e7 SR |
3188 | #ifdef CONFIG_TRACING |
3189 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3190 | sizeof(*mod->trace_bprintk_fmt_start), | |
3191 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3192 | #endif |
f91a13bb LT |
3193 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3194 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3195 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3196 | sizeof(*mod->ftrace_callsites), |
3197 | &mod->num_ftrace_callsites); | |
3198 | #endif | |
540adea3 MH |
3199 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3200 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3201 | sizeof(*mod->ei_funcs), | |
3202 | &mod->num_ei_funcs); | |
92ace999 | 3203 | #endif |
811d66a0 RR |
3204 | mod->extable = section_objs(info, "__ex_table", |
3205 | sizeof(*mod->extable), &mod->num_exentries); | |
3206 | ||
49668688 | 3207 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3208 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3209 | |
3210 | info->debug = section_objs(info, "__verbose", | |
3211 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3212 | |
3213 | return 0; | |
f91a13bb LT |
3214 | } |
3215 | ||
49668688 | 3216 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3217 | { |
3218 | int i; | |
3219 | void *ptr; | |
3220 | ||
3221 | /* Do the allocs. */ | |
7523e4dc | 3222 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3223 | /* |
3224 | * The pointer to this block is stored in the module structure | |
3225 | * which is inside the block. Just mark it as not being a | |
3226 | * leak. | |
3227 | */ | |
3228 | kmemleak_not_leak(ptr); | |
3229 | if (!ptr) | |
d913188c | 3230 | return -ENOMEM; |
65b8a9b4 | 3231 | |
7523e4dc RR |
3232 | memset(ptr, 0, mod->core_layout.size); |
3233 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3234 | |
7523e4dc RR |
3235 | if (mod->init_layout.size) { |
3236 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3237 | /* |
3238 | * The pointer to this block is stored in the module structure | |
3239 | * which is inside the block. This block doesn't need to be | |
3240 | * scanned as it contains data and code that will be freed | |
3241 | * after the module is initialized. | |
3242 | */ | |
3243 | kmemleak_ignore(ptr); | |
3244 | if (!ptr) { | |
7523e4dc | 3245 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3246 | return -ENOMEM; |
3247 | } | |
7523e4dc RR |
3248 | memset(ptr, 0, mod->init_layout.size); |
3249 | mod->init_layout.base = ptr; | |
82fab442 | 3250 | } else |
7523e4dc | 3251 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3252 | |
3253 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3254 | pr_debug("final section addresses:\n"); |
49668688 | 3255 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3256 | void *dest; |
49668688 | 3257 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3258 | |
49668688 | 3259 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3260 | continue; |
3261 | ||
49668688 | 3262 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3263 | dest = mod->init_layout.base |
49668688 | 3264 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3265 | else |
7523e4dc | 3266 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3267 | |
49668688 RR |
3268 | if (shdr->sh_type != SHT_NOBITS) |
3269 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3270 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3271 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3272 | pr_debug("\t0x%lx %s\n", |
3273 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3274 | } |
d913188c RR |
3275 | |
3276 | return 0; | |
65b8a9b4 LT |
3277 | } |
3278 | ||
49668688 | 3279 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3280 | { |
3205c36c LP |
3281 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3282 | ||
22e268eb RR |
3283 | /* |
3284 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3285 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3286 | * using GPL-only symbols it needs. | |
3287 | */ | |
3288 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3289 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3290 | |
3291 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3292 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3293 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3294 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3295 | |
c99af375 MG |
3296 | /* lve claims to be GPL but upstream won't provide source */ |
3297 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3298 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3299 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3300 | |
3205c36c LP |
3301 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3302 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3303 | ||
22e268eb RR |
3304 | #ifdef CONFIG_MODVERSIONS |
3305 | if ((mod->num_syms && !mod->crcs) | |
3306 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3307 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3308 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3309 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3310 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3311 | #endif | |
3312 | ) { | |
3313 | return try_to_force_load(mod, | |
3314 | "no versions for exported symbols"); | |
3315 | } | |
3316 | #endif | |
3317 | return 0; | |
3318 | } | |
3319 | ||
3320 | static void flush_module_icache(const struct module *mod) | |
3321 | { | |
3322 | mm_segment_t old_fs; | |
3323 | ||
3324 | /* flush the icache in correct context */ | |
3325 | old_fs = get_fs(); | |
3326 | set_fs(KERNEL_DS); | |
3327 | ||
3328 | /* | |
3329 | * Flush the instruction cache, since we've played with text. | |
3330 | * Do it before processing of module parameters, so the module | |
3331 | * can provide parameter accessor functions of its own. | |
3332 | */ | |
7523e4dc RR |
3333 | if (mod->init_layout.base) |
3334 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3335 | (unsigned long)mod->init_layout.base | |
3336 | + mod->init_layout.size); | |
3337 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3338 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3339 | |
3340 | set_fs(old_fs); | |
3341 | } | |
3342 | ||
74e08fcf JB |
3343 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3344 | Elf_Shdr *sechdrs, | |
3345 | char *secstrings, | |
3346 | struct module *mod) | |
3347 | { | |
3348 | return 0; | |
3349 | } | |
3350 | ||
be7de5f9 PB |
3351 | /* module_blacklist is a comma-separated list of module names */ |
3352 | static char *module_blacklist; | |
96b5b194 | 3353 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3354 | { |
3355 | const char *p; | |
3356 | size_t len; | |
3357 | ||
3358 | if (!module_blacklist) | |
3359 | return false; | |
3360 | ||
3361 | for (p = module_blacklist; *p; p += len) { | |
3362 | len = strcspn(p, ","); | |
3363 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3364 | return true; | |
3365 | if (p[len] == ',') | |
3366 | len++; | |
3367 | } | |
3368 | return false; | |
3369 | } | |
3370 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3371 | ||
2f3238ae | 3372 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3373 | { |
1da177e4 | 3374 | struct module *mod; |
444d13ff | 3375 | unsigned int ndx; |
d913188c | 3376 | int err; |
3ae91c21 | 3377 | |
81a0abd9 | 3378 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3379 | if (err) |
3380 | return ERR_PTR(err); | |
1da177e4 | 3381 | |
1da177e4 | 3382 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3383 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3384 | info->secstrings, info->mod); |
1da177e4 | 3385 | if (err < 0) |
8d8022e8 | 3386 | return ERR_PTR(err); |
1da177e4 | 3387 | |
8d8022e8 RR |
3388 | /* We will do a special allocation for per-cpu sections later. */ |
3389 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3390 | |
444d13ff JY |
3391 | /* |
3392 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3393 | * layout_sections() can put it in the right place. | |
3394 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3395 | */ | |
3396 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3397 | if (ndx) |
3398 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3399 | /* | |
3400 | * Mark the __jump_table section as ro_after_init as well: these data | |
3401 | * structures are never modified, with the exception of entries that | |
3402 | * refer to code in the __init section, which are annotated as such | |
3403 | * at module load time. | |
3404 | */ | |
3405 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3406 | if (ndx) |
3407 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3408 | ||
1da177e4 LT |
3409 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3410 | this is done generically; there doesn't appear to be any | |
3411 | special cases for the architectures. */ | |
81a0abd9 JY |
3412 | layout_sections(info->mod, info); |
3413 | layout_symtab(info->mod, info); | |
1da177e4 | 3414 | |
65b8a9b4 | 3415 | /* Allocate and move to the final place */ |
81a0abd9 | 3416 | err = move_module(info->mod, info); |
d913188c | 3417 | if (err) |
8d8022e8 | 3418 | return ERR_PTR(err); |
d913188c RR |
3419 | |
3420 | /* Module has been copied to its final place now: return it. */ | |
3421 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3422 | kmemleak_load_module(mod, info); |
d913188c | 3423 | return mod; |
d913188c RR |
3424 | } |
3425 | ||
3426 | /* mod is no longer valid after this! */ | |
3427 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3428 | { | |
d913188c | 3429 | percpu_modfree(mod); |
d453cded | 3430 | module_arch_freeing_init(mod); |
7523e4dc RR |
3431 | module_memfree(mod->init_layout.base); |
3432 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3433 | } |
3434 | ||
74e08fcf JB |
3435 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3436 | const Elf_Shdr *sechdrs, | |
3437 | struct module *me) | |
3438 | { | |
3439 | return 0; | |
3440 | } | |
3441 | ||
811d66a0 RR |
3442 | static int post_relocation(struct module *mod, const struct load_info *info) |
3443 | { | |
51f3d0f4 | 3444 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3445 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3446 | ||
3447 | /* Copy relocated percpu area over. */ | |
3448 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3449 | info->sechdrs[info->index.pcpu].sh_size); | |
3450 | ||
51f3d0f4 | 3451 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3452 | add_kallsyms(mod, info); |
3453 | ||
3454 | /* Arch-specific module finalizing. */ | |
3455 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3456 | } | |
3457 | ||
9bb9c3be RR |
3458 | /* Is this module of this name done loading? No locks held. */ |
3459 | static bool finished_loading(const char *name) | |
3460 | { | |
3461 | struct module *mod; | |
3462 | bool ret; | |
3463 | ||
9cc019b8 PZ |
3464 | /* |
3465 | * The module_mutex should not be a heavily contended lock; | |
3466 | * if we get the occasional sleep here, we'll go an extra iteration | |
3467 | * in the wait_event_interruptible(), which is harmless. | |
3468 | */ | |
3469 | sched_annotate_sleep(); | |
9bb9c3be | 3470 | mutex_lock(&module_mutex); |
4f6de4d5 | 3471 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 3472 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
3473 | mutex_unlock(&module_mutex); |
3474 | ||
3475 | return ret; | |
3476 | } | |
3477 | ||
34e1169d KC |
3478 | /* Call module constructors. */ |
3479 | static void do_mod_ctors(struct module *mod) | |
3480 | { | |
3481 | #ifdef CONFIG_CONSTRUCTORS | |
3482 | unsigned long i; | |
3483 | ||
3484 | for (i = 0; i < mod->num_ctors; i++) | |
3485 | mod->ctors[i](); | |
3486 | #endif | |
3487 | } | |
3488 | ||
c7496379 RR |
3489 | /* For freeing module_init on success, in case kallsyms traversing */ |
3490 | struct mod_initfree { | |
1a7b7d92 | 3491 | struct llist_node node; |
c7496379 RR |
3492 | void *module_init; |
3493 | }; | |
3494 | ||
1a7b7d92 | 3495 | static void do_free_init(struct work_struct *w) |
c7496379 | 3496 | { |
1a7b7d92 RE |
3497 | struct llist_node *pos, *n, *list; |
3498 | struct mod_initfree *initfree; | |
3499 | ||
3500 | list = llist_del_all(&init_free_list); | |
3501 | ||
3502 | synchronize_rcu(); | |
3503 | ||
3504 | llist_for_each_safe(pos, n, list) { | |
3505 | initfree = container_of(pos, struct mod_initfree, node); | |
3506 | module_memfree(initfree->module_init); | |
3507 | kfree(initfree); | |
3508 | } | |
c7496379 RR |
3509 | } |
3510 | ||
1a7b7d92 RE |
3511 | static int __init modules_wq_init(void) |
3512 | { | |
3513 | INIT_WORK(&init_free_wq, do_free_init); | |
3514 | init_llist_head(&init_free_list); | |
3515 | return 0; | |
3516 | } | |
3517 | module_init(modules_wq_init); | |
3518 | ||
be02a186 JK |
3519 | /* |
3520 | * This is where the real work happens. | |
3521 | * | |
3522 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3523 | * helper command 'lx-symbols'. | |
3524 | */ | |
3525 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3526 | { |
3527 | int ret = 0; | |
c7496379 RR |
3528 | struct mod_initfree *freeinit; |
3529 | ||
3530 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3531 | if (!freeinit) { | |
3532 | ret = -ENOMEM; | |
3533 | goto fail; | |
3534 | } | |
7523e4dc | 3535 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3536 | |
774a1221 TH |
3537 | /* |
3538 | * We want to find out whether @mod uses async during init. Clear | |
3539 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3540 | */ | |
3541 | current->flags &= ~PF_USED_ASYNC; | |
3542 | ||
34e1169d KC |
3543 | do_mod_ctors(mod); |
3544 | /* Start the module */ | |
3545 | if (mod->init != NULL) | |
3546 | ret = do_one_initcall(mod->init); | |
3547 | if (ret < 0) { | |
c7496379 | 3548 | goto fail_free_freeinit; |
34e1169d KC |
3549 | } |
3550 | if (ret > 0) { | |
bddb12b3 AM |
3551 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3552 | "follow 0/-E convention\n" | |
3553 | "%s: loading module anyway...\n", | |
3554 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3555 | dump_stack(); |
3556 | } | |
3557 | ||
3558 | /* Now it's a first class citizen! */ | |
3559 | mod->state = MODULE_STATE_LIVE; | |
3560 | blocking_notifier_call_chain(&module_notify_list, | |
3561 | MODULE_STATE_LIVE, mod); | |
3562 | ||
774a1221 TH |
3563 | /* |
3564 | * We need to finish all async code before the module init sequence | |
3565 | * is done. This has potential to deadlock. For example, a newly | |
3566 | * detected block device can trigger request_module() of the | |
3567 | * default iosched from async probing task. Once userland helper | |
3568 | * reaches here, async_synchronize_full() will wait on the async | |
3569 | * task waiting on request_module() and deadlock. | |
3570 | * | |
3571 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3572 | * iff module init queued any async jobs. This isn't a full | |
3573 | * solution as it will deadlock the same if module loading from | |
3574 | * async jobs nests more than once; however, due to the various | |
3575 | * constraints, this hack seems to be the best option for now. | |
3576 | * Please refer to the following thread for details. | |
3577 | * | |
3578 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3579 | */ | |
f2411da7 | 3580 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3581 | async_synchronize_full(); |
34e1169d | 3582 | |
aba4b5c2 | 3583 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3584 | mod->init_layout.size); |
34e1169d KC |
3585 | mutex_lock(&module_mutex); |
3586 | /* Drop initial reference. */ | |
3587 | module_put(mod); | |
3588 | trim_init_extable(mod); | |
3589 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3590 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3591 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3592 | #endif |
444d13ff | 3593 | module_enable_ro(mod, true); |
93c2e105 | 3594 | mod_tree_remove_init(mod); |
d453cded | 3595 | module_arch_freeing_init(mod); |
7523e4dc RR |
3596 | mod->init_layout.base = NULL; |
3597 | mod->init_layout.size = 0; | |
3598 | mod->init_layout.ro_size = 0; | |
444d13ff | 3599 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3600 | mod->init_layout.text_size = 0; |
c7496379 RR |
3601 | /* |
3602 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3603 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3604 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3605 | * path. module_memfree() cannot be called in an interrupt, so do the |
3606 | * work and call synchronize_rcu() in a work queue. | |
3607 | * | |
ae646f0b JH |
3608 | * Note that module_alloc() on most architectures creates W+X page |
3609 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3610 | * code such as mark_rodata_ro() which depends on those mappings to | |
3611 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3612 | * rcu_barrier() |
c7496379 | 3613 | */ |
1a7b7d92 RE |
3614 | if (llist_add(&freeinit->node, &init_free_list)) |
3615 | schedule_work(&init_free_wq); | |
3616 | ||
34e1169d KC |
3617 | mutex_unlock(&module_mutex); |
3618 | wake_up_all(&module_wq); | |
3619 | ||
3620 | return 0; | |
c7496379 RR |
3621 | |
3622 | fail_free_freeinit: | |
3623 | kfree(freeinit); | |
3624 | fail: | |
3625 | /* Try to protect us from buggy refcounters. */ | |
3626 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3627 | synchronize_rcu(); |
c7496379 RR |
3628 | module_put(mod); |
3629 | blocking_notifier_call_chain(&module_notify_list, | |
3630 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3631 | klp_module_going(mod); |
7dcd182b | 3632 | ftrace_release_mod(mod); |
c7496379 RR |
3633 | free_module(mod); |
3634 | wake_up_all(&module_wq); | |
3635 | return ret; | |
34e1169d KC |
3636 | } |
3637 | ||
3638 | static int may_init_module(void) | |
3639 | { | |
3640 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3641 | return -EPERM; | |
3642 | ||
3643 | return 0; | |
3644 | } | |
3645 | ||
a3535c7e RR |
3646 | /* |
3647 | * We try to place it in the list now to make sure it's unique before | |
3648 | * we dedicate too many resources. In particular, temporary percpu | |
3649 | * memory exhaustion. | |
3650 | */ | |
3651 | static int add_unformed_module(struct module *mod) | |
3652 | { | |
3653 | int err; | |
3654 | struct module *old; | |
3655 | ||
3656 | mod->state = MODULE_STATE_UNFORMED; | |
3657 | ||
3658 | again: | |
3659 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3660 | old = find_module_all(mod->name, strlen(mod->name), true); |
3661 | if (old != NULL) { | |
6e6de3de | 3662 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
3663 | /* Wait in case it fails to load. */ |
3664 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3665 | err = wait_event_interruptible(module_wq, |
3666 | finished_loading(mod->name)); | |
a3535c7e RR |
3667 | if (err) |
3668 | goto out_unlocked; | |
3669 | goto again; | |
3670 | } | |
3671 | err = -EEXIST; | |
3672 | goto out; | |
3673 | } | |
4f666546 | 3674 | mod_update_bounds(mod); |
a3535c7e | 3675 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3676 | mod_tree_insert(mod); |
a3535c7e RR |
3677 | err = 0; |
3678 | ||
3679 | out: | |
3680 | mutex_unlock(&module_mutex); | |
3681 | out_unlocked: | |
3682 | return err; | |
3683 | } | |
3684 | ||
3685 | static int complete_formation(struct module *mod, struct load_info *info) | |
3686 | { | |
3687 | int err; | |
3688 | ||
3689 | mutex_lock(&module_mutex); | |
3690 | ||
3691 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3692 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3693 | if (err < 0) |
3694 | goto out; | |
3695 | ||
3696 | /* This relies on module_mutex for list integrity. */ | |
3697 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3698 | ||
444d13ff | 3699 | module_enable_ro(mod, false); |
85c898db | 3700 | module_enable_nx(mod); |
2eef1399 | 3701 | module_enable_x(mod); |
4982223e | 3702 | |
a3535c7e RR |
3703 | /* Mark state as coming so strong_try_module_get() ignores us, |
3704 | * but kallsyms etc. can see us. */ | |
3705 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3706 | mutex_unlock(&module_mutex); |
3707 | ||
4982223e | 3708 | return 0; |
a3535c7e RR |
3709 | |
3710 | out: | |
3711 | mutex_unlock(&module_mutex); | |
3712 | return err; | |
3713 | } | |
3714 | ||
4c973d16 JY |
3715 | static int prepare_coming_module(struct module *mod) |
3716 | { | |
7e545d6e JY |
3717 | int err; |
3718 | ||
4c973d16 | 3719 | ftrace_module_enable(mod); |
7e545d6e JY |
3720 | err = klp_module_coming(mod); |
3721 | if (err) | |
3722 | return err; | |
3723 | ||
4c973d16 JY |
3724 | blocking_notifier_call_chain(&module_notify_list, |
3725 | MODULE_STATE_COMING, mod); | |
3726 | return 0; | |
3727 | } | |
3728 | ||
ecc86170 LR |
3729 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3730 | void *arg) | |
54041d8a | 3731 | { |
f2411da7 LR |
3732 | struct module *mod = arg; |
3733 | int ret; | |
3734 | ||
3735 | if (strcmp(param, "async_probe") == 0) { | |
3736 | mod->async_probe_requested = true; | |
3737 | return 0; | |
3738 | } | |
3739 | ||
6da0b565 | 3740 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3741 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3742 | if (ret != 0) |
3743 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3744 | return 0; |
3745 | } | |
3746 | ||
d913188c RR |
3747 | /* Allocate and load the module: note that size of section 0 is always |
3748 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3749 | static int load_module(struct load_info *info, const char __user *uargs, |
3750 | int flags) | |
d913188c | 3751 | { |
a3535c7e | 3752 | struct module *mod; |
5fdc7db6 | 3753 | long err = 0; |
51e158c1 | 3754 | char *after_dashes; |
d913188c | 3755 | |
5fdc7db6 JY |
3756 | err = elf_header_check(info); |
3757 | if (err) | |
3758 | goto free_copy; | |
3759 | ||
3760 | err = setup_load_info(info, flags); | |
3761 | if (err) | |
3762 | goto free_copy; | |
3763 | ||
3764 | if (blacklisted(info->name)) { | |
3765 | err = -EPERM; | |
3766 | goto free_copy; | |
3767 | } | |
3768 | ||
bca014ca | 3769 | err = module_sig_check(info, flags); |
34e1169d KC |
3770 | if (err) |
3771 | goto free_copy; | |
d913188c | 3772 | |
5fdc7db6 | 3773 | err = rewrite_section_headers(info, flags); |
d913188c | 3774 | if (err) |
34e1169d | 3775 | goto free_copy; |
d913188c | 3776 | |
5fdc7db6 JY |
3777 | /* Check module struct version now, before we try to use module. */ |
3778 | if (!check_modstruct_version(info, info->mod)) { | |
3779 | err = -ENOEXEC; | |
3780 | goto free_copy; | |
3781 | } | |
3782 | ||
d913188c | 3783 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3784 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3785 | if (IS_ERR(mod)) { |
3786 | err = PTR_ERR(mod); | |
d913188c | 3787 | goto free_copy; |
1da177e4 | 3788 | } |
1da177e4 | 3789 | |
ca86cad7 RGB |
3790 | audit_log_kern_module(mod->name); |
3791 | ||
a3535c7e RR |
3792 | /* Reserve our place in the list. */ |
3793 | err = add_unformed_module(mod); | |
3794 | if (err) | |
1fb9341a | 3795 | goto free_module; |
1fb9341a | 3796 | |
106a4ee2 | 3797 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3798 | mod->sig_ok = info->sig_ok; |
64748a2c | 3799 | if (!mod->sig_ok) { |
bddb12b3 | 3800 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3801 | "and/or required key missing - tainting " |
bddb12b3 | 3802 | "kernel\n", mod->name); |
66cc69e3 | 3803 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3804 | } |
106a4ee2 RR |
3805 | #endif |
3806 | ||
8d8022e8 | 3807 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3808 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3809 | if (err) |
3810 | goto unlink_mod; | |
3811 | ||
49668688 | 3812 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3813 | err = module_unload_init(mod); |
3814 | if (err) | |
1fb9341a | 3815 | goto unlink_mod; |
1da177e4 | 3816 | |
cf2fde7b | 3817 | init_param_lock(mod); |
b51d23e4 | 3818 | |
22e268eb RR |
3819 | /* Now we've got everything in the final locations, we can |
3820 | * find optional sections. */ | |
eb3057df FH |
3821 | err = find_module_sections(mod, info); |
3822 | if (err) | |
3823 | goto free_unload; | |
9b37ccfc | 3824 | |
49668688 | 3825 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3826 | if (err) |
3827 | goto free_unload; | |
9841d61d | 3828 | |
c988d2b2 | 3829 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3830 | setup_modinfo(mod, info); |
c988d2b2 | 3831 | |
1da177e4 | 3832 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3833 | err = simplify_symbols(mod, info); |
1da177e4 | 3834 | if (err < 0) |
d913188c | 3835 | goto free_modinfo; |
1da177e4 | 3836 | |
34e1169d | 3837 | err = apply_relocations(mod, info); |
22e268eb | 3838 | if (err < 0) |
d913188c | 3839 | goto free_modinfo; |
1da177e4 | 3840 | |
34e1169d | 3841 | err = post_relocation(mod, info); |
1da177e4 | 3842 | if (err < 0) |
d913188c | 3843 | goto free_modinfo; |
1da177e4 | 3844 | |
22e268eb | 3845 | flush_module_icache(mod); |
378bac82 | 3846 | |
6526c534 RR |
3847 | /* Now copy in args */ |
3848 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3849 | if (IS_ERR(mod->args)) { | |
3850 | err = PTR_ERR(mod->args); | |
3851 | goto free_arch_cleanup; | |
3852 | } | |
8d3b33f6 | 3853 | |
52796312 | 3854 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3855 | |
a949ae56 SRRH |
3856 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3857 | ftrace_module_init(mod); | |
3858 | ||
a3535c7e RR |
3859 | /* Finally it's fully formed, ready to start executing. */ |
3860 | err = complete_formation(mod, info); | |
3861 | if (err) | |
1fb9341a | 3862 | goto ddebug_cleanup; |
be593f4c | 3863 | |
4c973d16 JY |
3864 | err = prepare_coming_module(mod); |
3865 | if (err) | |
3866 | goto bug_cleanup; | |
3867 | ||
51f3d0f4 | 3868 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3869 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3870 | -32768, 32767, mod, |
ecc86170 | 3871 | unknown_module_param_cb); |
51e158c1 RR |
3872 | if (IS_ERR(after_dashes)) { |
3873 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3874 | goto coming_cleanup; |
51e158c1 RR |
3875 | } else if (after_dashes) { |
3876 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3877 | mod->name, after_dashes); | |
3878 | } | |
1da177e4 | 3879 | |
ca86cad7 | 3880 | /* Link in to sysfs. */ |
34e1169d | 3881 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3882 | if (err < 0) |
4c973d16 | 3883 | goto coming_cleanup; |
80a3d1bb | 3884 | |
1ce15ef4 JY |
3885 | if (is_livepatch_module(mod)) { |
3886 | err = copy_module_elf(mod, info); | |
3887 | if (err < 0) | |
3888 | goto sysfs_cleanup; | |
3889 | } | |
3890 | ||
48fd1188 | 3891 | /* Get rid of temporary copy. */ |
34e1169d | 3892 | free_copy(info); |
1da177e4 LT |
3893 | |
3894 | /* Done! */ | |
51f3d0f4 | 3895 | trace_module_load(mod); |
34e1169d KC |
3896 | |
3897 | return do_init_module(mod); | |
1da177e4 | 3898 | |
1ce15ef4 JY |
3899 | sysfs_cleanup: |
3900 | mod_sysfs_teardown(mod); | |
4c973d16 | 3901 | coming_cleanup: |
885a78d4 | 3902 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3903 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3904 | blocking_notifier_call_chain(&module_notify_list, |
3905 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3906 | klp_module_going(mod); |
1fb9341a RR |
3907 | bug_cleanup: |
3908 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3909 | mutex_lock(&module_mutex); |
5336377d | 3910 | module_bug_cleanup(mod); |
ee61abb3 | 3911 | mutex_unlock(&module_mutex); |
ff7e0055 | 3912 | |
a3535c7e | 3913 | ddebug_cleanup: |
1323eac7 | 3914 | ftrace_release_mod(mod); |
52796312 | 3915 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 3916 | synchronize_rcu(); |
6526c534 RR |
3917 | kfree(mod->args); |
3918 | free_arch_cleanup: | |
1da177e4 | 3919 | module_arch_cleanup(mod); |
d913188c | 3920 | free_modinfo: |
a263f776 | 3921 | free_modinfo(mod); |
22e268eb | 3922 | free_unload: |
1da177e4 | 3923 | module_unload_free(mod); |
1fb9341a RR |
3924 | unlink_mod: |
3925 | mutex_lock(&module_mutex); | |
3926 | /* Unlink carefully: kallsyms could be walking list. */ | |
3927 | list_del_rcu(&mod->list); | |
758556bd | 3928 | mod_tree_remove(mod); |
1fb9341a | 3929 | wake_up_all(&module_wq); |
0be964be | 3930 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 3931 | synchronize_rcu(); |
1fb9341a | 3932 | mutex_unlock(&module_mutex); |
d913188c | 3933 | free_module: |
35a9393c | 3934 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3935 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3936 | |
34e1169d | 3937 | module_deallocate(mod, info); |
d913188c | 3938 | free_copy: |
34e1169d KC |
3939 | free_copy(info); |
3940 | return err; | |
b99b87f7 PO |
3941 | } |
3942 | ||
17da2bd9 HC |
3943 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3944 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3945 | { |
34e1169d KC |
3946 | int err; |
3947 | struct load_info info = { }; | |
1da177e4 | 3948 | |
34e1169d KC |
3949 | err = may_init_module(); |
3950 | if (err) | |
3951 | return err; | |
1da177e4 | 3952 | |
34e1169d KC |
3953 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3954 | umod, len, uargs); | |
1da177e4 | 3955 | |
34e1169d KC |
3956 | err = copy_module_from_user(umod, len, &info); |
3957 | if (err) | |
3958 | return err; | |
1da177e4 | 3959 | |
2f3238ae | 3960 | return load_module(&info, uargs, 0); |
34e1169d | 3961 | } |
94462ad3 | 3962 | |
2f3238ae | 3963 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3964 | { |
34e1169d | 3965 | struct load_info info = { }; |
a1db7420 MZ |
3966 | loff_t size; |
3967 | void *hdr; | |
3968 | int err; | |
94462ad3 | 3969 | |
34e1169d KC |
3970 | err = may_init_module(); |
3971 | if (err) | |
3972 | return err; | |
1da177e4 | 3973 | |
2f3238ae | 3974 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3975 | |
2f3238ae RR |
3976 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3977 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3978 | return -EINVAL; | |
d6de2c80 | 3979 | |
a1db7420 MZ |
3980 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
3981 | READING_MODULE); | |
34e1169d KC |
3982 | if (err) |
3983 | return err; | |
a1db7420 MZ |
3984 | info.hdr = hdr; |
3985 | info.len = size; | |
1da177e4 | 3986 | |
2f3238ae | 3987 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3988 | } |
3989 | ||
3990 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3991 | { | |
3992 | return ((void *)addr >= start && (void *)addr < start + size); | |
3993 | } | |
3994 | ||
3995 | #ifdef CONFIG_KALLSYMS | |
3996 | /* | |
3997 | * This ignores the intensely annoying "mapping symbols" found | |
3998 | * in ARM ELF files: $a, $t and $d. | |
3999 | */ | |
4000 | static inline int is_arm_mapping_symbol(const char *str) | |
4001 | { | |
2e3a10a1 RK |
4002 | if (str[0] == '.' && str[1] == 'L') |
4003 | return true; | |
6c34f1f5 | 4004 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
4005 | && (str[2] == '\0' || str[2] == '.'); |
4006 | } | |
4007 | ||
2d25bc55 | 4008 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 4009 | { |
8244062e | 4010 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
4011 | } |
4012 | ||
2d25bc55 JY |
4013 | /* |
4014 | * Given a module and address, find the corresponding symbol and return its name | |
4015 | * while providing its size and offset if needed. | |
4016 | */ | |
4017 | static const char *find_kallsyms_symbol(struct module *mod, | |
4018 | unsigned long addr, | |
4019 | unsigned long *size, | |
4020 | unsigned long *offset) | |
1da177e4 LT |
4021 | { |
4022 | unsigned int i, best = 0; | |
93d77e7f | 4023 | unsigned long nextval, bestval; |
8244062e | 4024 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
4025 | |
4026 | /* At worse, next value is at end of module */ | |
a06f6211 | 4027 | if (within_module_init(addr, mod)) |
7523e4dc | 4028 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 4029 | else |
7523e4dc | 4030 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 4031 | |
93d77e7f VW |
4032 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
4033 | ||
25985edc | 4034 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 4035 | starts real symbols at 1). */ |
8244062e | 4036 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
4037 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
4038 | unsigned long thisval = kallsyms_symbol_value(sym); | |
4039 | ||
4040 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
4041 | continue; |
4042 | ||
4043 | /* We ignore unnamed symbols: they're uninformative | |
4044 | * and inserted at a whim. */ | |
2d25bc55 JY |
4045 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
4046 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
4047 | continue; |
4048 | ||
93d77e7f | 4049 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 4050 | best = i; |
93d77e7f VW |
4051 | bestval = thisval; |
4052 | } | |
4053 | if (thisval > addr && thisval < nextval) | |
4054 | nextval = thisval; | |
1da177e4 LT |
4055 | } |
4056 | ||
4057 | if (!best) | |
4058 | return NULL; | |
4059 | ||
ffb45122 | 4060 | if (size) |
93d77e7f | 4061 | *size = nextval - bestval; |
ffb45122 | 4062 | if (offset) |
93d77e7f | 4063 | *offset = addr - bestval; |
2d25bc55 JY |
4064 | |
4065 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
4066 | } |
4067 | ||
b865ea64 SS |
4068 | void * __weak dereference_module_function_descriptor(struct module *mod, |
4069 | void *ptr) | |
4070 | { | |
4071 | return ptr; | |
4072 | } | |
4073 | ||
6dd06c9f RR |
4074 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
4075 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 4076 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
4077 | unsigned long *size, |
4078 | unsigned long *offset, | |
4079 | char **modname, | |
4080 | char *namebuf) | |
1da177e4 | 4081 | { |
cb2a5205 | 4082 | const char *ret = NULL; |
b7df4d1b | 4083 | struct module *mod; |
1da177e4 | 4084 | |
cb2a5205 | 4085 | preempt_disable(); |
b7df4d1b PZ |
4086 | mod = __module_address(addr); |
4087 | if (mod) { | |
4088 | if (modname) | |
4089 | *modname = mod->name; | |
2d25bc55 JY |
4090 | |
4091 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4092 | } |
6dd06c9f RR |
4093 | /* Make a copy in here where it's safe */ |
4094 | if (ret) { | |
4095 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4096 | ret = namebuf; | |
4097 | } | |
cb2a5205 | 4098 | preempt_enable(); |
b7df4d1b | 4099 | |
92dfc9dc | 4100 | return ret; |
1da177e4 LT |
4101 | } |
4102 | ||
9d65cb4a AD |
4103 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4104 | { | |
4105 | struct module *mod; | |
4106 | ||
cb2a5205 | 4107 | preempt_disable(); |
d72b3751 | 4108 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4109 | if (mod->state == MODULE_STATE_UNFORMED) |
4110 | continue; | |
9b20a352 | 4111 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4112 | const char *sym; |
4113 | ||
2d25bc55 | 4114 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4115 | if (!sym) |
4116 | goto out; | |
2d25bc55 | 4117 | |
9281acea | 4118 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4119 | preempt_enable(); |
9d65cb4a AD |
4120 | return 0; |
4121 | } | |
4122 | } | |
4123 | out: | |
cb2a5205 | 4124 | preempt_enable(); |
9d65cb4a AD |
4125 | return -ERANGE; |
4126 | } | |
4127 | ||
a5c43dae AD |
4128 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4129 | unsigned long *offset, char *modname, char *name) | |
4130 | { | |
4131 | struct module *mod; | |
4132 | ||
cb2a5205 | 4133 | preempt_disable(); |
d72b3751 | 4134 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4135 | if (mod->state == MODULE_STATE_UNFORMED) |
4136 | continue; | |
9b20a352 | 4137 | if (within_module(addr, mod)) { |
a5c43dae AD |
4138 | const char *sym; |
4139 | ||
2d25bc55 | 4140 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4141 | if (!sym) |
4142 | goto out; | |
4143 | if (modname) | |
9281acea | 4144 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4145 | if (name) |
9281acea | 4146 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4147 | preempt_enable(); |
a5c43dae AD |
4148 | return 0; |
4149 | } | |
4150 | } | |
4151 | out: | |
cb2a5205 | 4152 | preempt_enable(); |
a5c43dae AD |
4153 | return -ERANGE; |
4154 | } | |
4155 | ||
ea07890a AD |
4156 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4157 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4158 | { |
4159 | struct module *mod; | |
4160 | ||
cb2a5205 | 4161 | preempt_disable(); |
d72b3751 | 4162 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4163 | struct mod_kallsyms *kallsyms; |
4164 | ||
0d21b0e3 RR |
4165 | if (mod->state == MODULE_STATE_UNFORMED) |
4166 | continue; | |
8244062e RR |
4167 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4168 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4169 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4170 | ||
4171 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4172 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4173 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4174 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4175 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4176 | preempt_enable(); |
ea07890a | 4177 | return 0; |
1da177e4 | 4178 | } |
8244062e | 4179 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4180 | } |
cb2a5205 | 4181 | preempt_enable(); |
ea07890a | 4182 | return -ERANGE; |
1da177e4 LT |
4183 | } |
4184 | ||
2d25bc55 JY |
4185 | /* Given a module and name of symbol, find and return the symbol's value */ |
4186 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4187 | { |
4188 | unsigned int i; | |
8244062e | 4189 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4190 | |
93d77e7f VW |
4191 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4192 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4193 | ||
2d25bc55 | 4194 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4195 | sym->st_shndx != SHN_UNDEF) |
4196 | return kallsyms_symbol_value(sym); | |
4197 | } | |
1da177e4 LT |
4198 | return 0; |
4199 | } | |
4200 | ||
4201 | /* Look for this name: can be of form module:name. */ | |
4202 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4203 | { | |
4204 | struct module *mod; | |
4205 | char *colon; | |
4206 | unsigned long ret = 0; | |
4207 | ||
4208 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4209 | preempt_disable(); |
17586188 | 4210 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4211 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4212 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4213 | } else { |
0d21b0e3 RR |
4214 | list_for_each_entry_rcu(mod, &modules, list) { |
4215 | if (mod->state == MODULE_STATE_UNFORMED) | |
4216 | continue; | |
2d25bc55 | 4217 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4218 | break; |
0d21b0e3 | 4219 | } |
1da177e4 | 4220 | } |
cb2a5205 | 4221 | preempt_enable(); |
1da177e4 LT |
4222 | return ret; |
4223 | } | |
75a66614 AK |
4224 | |
4225 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4226 | struct module *, unsigned long), | |
4227 | void *data) | |
4228 | { | |
4229 | struct module *mod; | |
4230 | unsigned int i; | |
4231 | int ret; | |
4232 | ||
0be964be PZ |
4233 | module_assert_mutex(); |
4234 | ||
75a66614 | 4235 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4236 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4237 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4238 | ||
0d21b0e3 RR |
4239 | if (mod->state == MODULE_STATE_UNFORMED) |
4240 | continue; | |
8244062e | 4241 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4242 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4243 | |
93d77e7f | 4244 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4245 | continue; |
4246 | ||
2d25bc55 | 4247 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4248 | mod, kallsyms_symbol_value(sym)); |
75a66614 AK |
4249 | if (ret != 0) |
4250 | return ret; | |
4251 | } | |
4252 | } | |
4253 | return 0; | |
4254 | } | |
1da177e4 LT |
4255 | #endif /* CONFIG_KALLSYMS */ |
4256 | ||
7fd8329b PM |
4257 | /* Maximum number of characters written by module_flags() */ |
4258 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4259 | ||
4260 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4261 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4262 | { |
4263 | int bx = 0; | |
4264 | ||
0d21b0e3 | 4265 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4266 | if (mod->taints || |
4267 | mod->state == MODULE_STATE_GOING || | |
4268 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4269 | buf[bx++] = '('; |
cca3e707 | 4270 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4271 | /* Show a - for module-is-being-unloaded */ |
4272 | if (mod->state == MODULE_STATE_GOING) | |
4273 | buf[bx++] = '-'; | |
4274 | /* Show a + for module-is-being-loaded */ | |
4275 | if (mod->state == MODULE_STATE_COMING) | |
4276 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4277 | buf[bx++] = ')'; |
4278 | } | |
4279 | buf[bx] = '\0'; | |
4280 | ||
4281 | return buf; | |
4282 | } | |
4283 | ||
3b5d5c6b AD |
4284 | #ifdef CONFIG_PROC_FS |
4285 | /* Called by the /proc file system to return a list of modules. */ | |
4286 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4287 | { | |
4288 | mutex_lock(&module_mutex); | |
4289 | return seq_list_start(&modules, *pos); | |
4290 | } | |
4291 | ||
4292 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4293 | { | |
4294 | return seq_list_next(p, &modules, pos); | |
4295 | } | |
4296 | ||
4297 | static void m_stop(struct seq_file *m, void *p) | |
4298 | { | |
4299 | mutex_unlock(&module_mutex); | |
4300 | } | |
4301 | ||
1da177e4 LT |
4302 | static int m_show(struct seq_file *m, void *p) |
4303 | { | |
4304 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4305 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4306 | void *value; |
fa3ba2e8 | 4307 | |
0d21b0e3 RR |
4308 | /* We always ignore unformed modules. */ |
4309 | if (mod->state == MODULE_STATE_UNFORMED) | |
4310 | return 0; | |
4311 | ||
2f0f2a33 | 4312 | seq_printf(m, "%s %u", |
7523e4dc | 4313 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4314 | print_unload_info(m, mod); |
4315 | ||
4316 | /* Informative for users. */ | |
4317 | seq_printf(m, " %s", | |
6da0b565 IA |
4318 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4319 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4320 | "Live"); |
4321 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4322 | value = m->private ? NULL : mod->core_layout.base; |
4323 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4324 | |
fa3ba2e8 FM |
4325 | /* Taints info */ |
4326 | if (mod->taints) | |
21aa9280 | 4327 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4328 | |
6da0b565 | 4329 | seq_puts(m, "\n"); |
1da177e4 LT |
4330 | return 0; |
4331 | } | |
4332 | ||
4333 | /* Format: modulename size refcount deps address | |
4334 | ||
4335 | Where refcount is a number or -, and deps is a comma-separated list | |
4336 | of depends or -. | |
4337 | */ | |
3b5d5c6b | 4338 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4339 | .start = m_start, |
4340 | .next = m_next, | |
4341 | .stop = m_stop, | |
4342 | .show = m_show | |
4343 | }; | |
4344 | ||
516fb7f2 LT |
4345 | /* |
4346 | * This also sets the "private" pointer to non-NULL if the | |
4347 | * kernel pointers should be hidden (so you can just test | |
4348 | * "m->private" to see if you should keep the values private). | |
4349 | * | |
4350 | * We use the same logic as for /proc/kallsyms. | |
4351 | */ | |
3b5d5c6b AD |
4352 | static int modules_open(struct inode *inode, struct file *file) |
4353 | { | |
516fb7f2 LT |
4354 | int err = seq_open(file, &modules_op); |
4355 | ||
4356 | if (!err) { | |
4357 | struct seq_file *m = file->private_data; | |
4358 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4359 | } | |
4360 | ||
3f553b30 | 4361 | return err; |
3b5d5c6b AD |
4362 | } |
4363 | ||
4364 | static const struct file_operations proc_modules_operations = { | |
4365 | .open = modules_open, | |
4366 | .read = seq_read, | |
4367 | .llseek = seq_lseek, | |
4368 | .release = seq_release, | |
4369 | }; | |
4370 | ||
4371 | static int __init proc_modules_init(void) | |
4372 | { | |
4373 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4374 | return 0; | |
4375 | } | |
4376 | module_init(proc_modules_init); | |
4377 | #endif | |
4378 | ||
1da177e4 LT |
4379 | /* Given an address, look for it in the module exception tables. */ |
4380 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4381 | { | |
1da177e4 LT |
4382 | const struct exception_table_entry *e = NULL; |
4383 | struct module *mod; | |
4384 | ||
24da1cbf | 4385 | preempt_disable(); |
5ff22646 PZ |
4386 | mod = __module_address(addr); |
4387 | if (!mod) | |
4388 | goto out; | |
22a8bdeb | 4389 | |
5ff22646 PZ |
4390 | if (!mod->num_exentries) |
4391 | goto out; | |
4392 | ||
4393 | e = search_extable(mod->extable, | |
a94c33dd | 4394 | mod->num_exentries, |
5ff22646 PZ |
4395 | addr); |
4396 | out: | |
24da1cbf | 4397 | preempt_enable(); |
1da177e4 | 4398 | |
5ff22646 PZ |
4399 | /* |
4400 | * Now, if we found one, we are running inside it now, hence | |
4401 | * we cannot unload the module, hence no refcnt needed. | |
4402 | */ | |
1da177e4 LT |
4403 | return e; |
4404 | } | |
4405 | ||
4d435f9d | 4406 | /* |
e610499e RR |
4407 | * is_module_address - is this address inside a module? |
4408 | * @addr: the address to check. | |
4409 | * | |
4410 | * See is_module_text_address() if you simply want to see if the address | |
4411 | * is code (not data). | |
4d435f9d | 4412 | */ |
e610499e | 4413 | bool is_module_address(unsigned long addr) |
4d435f9d | 4414 | { |
e610499e | 4415 | bool ret; |
4d435f9d | 4416 | |
24da1cbf | 4417 | preempt_disable(); |
e610499e | 4418 | ret = __module_address(addr) != NULL; |
24da1cbf | 4419 | preempt_enable(); |
4d435f9d | 4420 | |
e610499e | 4421 | return ret; |
4d435f9d IM |
4422 | } |
4423 | ||
e610499e RR |
4424 | /* |
4425 | * __module_address - get the module which contains an address. | |
4426 | * @addr: the address. | |
4427 | * | |
4428 | * Must be called with preempt disabled or module mutex held so that | |
4429 | * module doesn't get freed during this. | |
4430 | */ | |
714f83d5 | 4431 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4432 | { |
4433 | struct module *mod; | |
4434 | ||
3a642e99 RR |
4435 | if (addr < module_addr_min || addr > module_addr_max) |
4436 | return NULL; | |
4437 | ||
0be964be PZ |
4438 | module_assert_mutex_or_preempt(); |
4439 | ||
6c9692e2 | 4440 | mod = mod_find(addr); |
93c2e105 PZ |
4441 | if (mod) { |
4442 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4443 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4444 | mod = NULL; |
0d21b0e3 | 4445 | } |
93c2e105 | 4446 | return mod; |
1da177e4 | 4447 | } |
c6b37801 | 4448 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4449 | |
e610499e RR |
4450 | /* |
4451 | * is_module_text_address - is this address inside module code? | |
4452 | * @addr: the address to check. | |
4453 | * | |
4454 | * See is_module_address() if you simply want to see if the address is | |
4455 | * anywhere in a module. See kernel_text_address() for testing if an | |
4456 | * address corresponds to kernel or module code. | |
4457 | */ | |
4458 | bool is_module_text_address(unsigned long addr) | |
4459 | { | |
4460 | bool ret; | |
4461 | ||
4462 | preempt_disable(); | |
4463 | ret = __module_text_address(addr) != NULL; | |
4464 | preempt_enable(); | |
4465 | ||
4466 | return ret; | |
4467 | } | |
4468 | ||
4469 | /* | |
4470 | * __module_text_address - get the module whose code contains an address. | |
4471 | * @addr: the address. | |
4472 | * | |
4473 | * Must be called with preempt disabled or module mutex held so that | |
4474 | * module doesn't get freed during this. | |
4475 | */ | |
4476 | struct module *__module_text_address(unsigned long addr) | |
4477 | { | |
4478 | struct module *mod = __module_address(addr); | |
4479 | if (mod) { | |
4480 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4481 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4482 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4483 | mod = NULL; |
4484 | } | |
4485 | return mod; | |
4486 | } | |
c6b37801 | 4487 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4488 | |
1da177e4 LT |
4489 | /* Don't grab lock, we're oopsing. */ |
4490 | void print_modules(void) | |
4491 | { | |
4492 | struct module *mod; | |
7fd8329b | 4493 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4494 | |
b231125a | 4495 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4496 | /* Most callers should already have preempt disabled, but make sure */ |
4497 | preempt_disable(); | |
0d21b0e3 RR |
4498 | list_for_each_entry_rcu(mod, &modules, list) { |
4499 | if (mod->state == MODULE_STATE_UNFORMED) | |
4500 | continue; | |
27bba4d6 | 4501 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4502 | } |
d72b3751 | 4503 | preempt_enable(); |
e14af7ee | 4504 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4505 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4506 | pr_cont("\n"); | |
1da177e4 LT |
4507 | } |
4508 | ||
1da177e4 | 4509 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4510 | /* Generate the signature for all relevant module structures here. |
4511 | * If these change, we don't want to try to parse the module. */ | |
4512 | void module_layout(struct module *mod, | |
4513 | struct modversion_info *ver, | |
4514 | struct kernel_param *kp, | |
4515 | struct kernel_symbol *ks, | |
65498646 | 4516 | struct tracepoint * const *tp) |
8c8ef42a RR |
4517 | { |
4518 | } | |
4519 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4520 | #endif |