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Commit | Line | Data |
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f71d20e9 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 LT |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
9984de1a | 19 | #include <linux/export.h> |
1da177e4 | 20 | #include <linux/moduleloader.h> |
6d723736 | 21 | #include <linux/ftrace_event.h> |
1da177e4 | 22 | #include <linux/init.h> |
ae84e324 | 23 | #include <linux/kallsyms.h> |
34e1169d | 24 | #include <linux/file.h> |
3b5d5c6b | 25 | #include <linux/fs.h> |
6d760133 | 26 | #include <linux/sysfs.h> |
9f158333 | 27 | #include <linux/kernel.h> |
1da177e4 LT |
28 | #include <linux/slab.h> |
29 | #include <linux/vmalloc.h> | |
30 | #include <linux/elf.h> | |
3b5d5c6b | 31 | #include <linux/proc_fs.h> |
2e72d51b | 32 | #include <linux/security.h> |
1da177e4 LT |
33 | #include <linux/seq_file.h> |
34 | #include <linux/syscalls.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/rcupdate.h> | |
c59ede7b | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/cpu.h> |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/err.h> | |
42 | #include <linux/vermagic.h> | |
43 | #include <linux/notifier.h> | |
f6a57033 | 44 | #include <linux/sched.h> |
1da177e4 | 45 | #include <linux/device.h> |
c988d2b2 | 46 | #include <linux/string.h> |
97d1f15b | 47 | #include <linux/mutex.h> |
d72b3751 | 48 | #include <linux/rculist.h> |
1da177e4 | 49 | #include <asm/uaccess.h> |
1da177e4 | 50 | #include <asm/cacheflush.h> |
eb8cdec4 | 51 | #include <asm/mmu_context.h> |
b817f6fe | 52 | #include <linux/license.h> |
6d762394 | 53 | #include <asm/sections.h> |
97e1c18e | 54 | #include <linux/tracepoint.h> |
90d595fe | 55 | #include <linux/ftrace.h> |
22a9d645 | 56 | #include <linux/async.h> |
fbf59bc9 | 57 | #include <linux/percpu.h> |
4f2294b6 | 58 | #include <linux/kmemleak.h> |
bf5438fc | 59 | #include <linux/jump_label.h> |
84e1c6bb | 60 | #include <linux/pfn.h> |
403ed278 | 61 | #include <linux/bsearch.h> |
2f3238ae | 62 | #include <uapi/linux/module.h> |
106a4ee2 | 63 | #include "module-internal.h" |
1da177e4 | 64 | |
7ead8b83 LZ |
65 | #define CREATE_TRACE_POINTS |
66 | #include <trace/events/module.h> | |
67 | ||
1da177e4 LT |
68 | #ifndef ARCH_SHF_SMALL |
69 | #define ARCH_SHF_SMALL 0 | |
70 | #endif | |
71 | ||
84e1c6bb | 72 | /* |
73 | * Modules' sections will be aligned on page boundaries | |
74 | * to ensure complete separation of code and data, but | |
75 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y | |
76 | */ | |
77 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
78 | # define debug_align(X) ALIGN(X, PAGE_SIZE) | |
79 | #else | |
80 | # define debug_align(X) (X) | |
81 | #endif | |
82 | ||
83 | /* | |
84 | * Given BASE and SIZE this macro calculates the number of pages the | |
85 | * memory regions occupies | |
86 | */ | |
87 | #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \ | |
88 | (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \ | |
89 | PFN_DOWN((unsigned long)BASE) + 1) \ | |
90 | : (0UL)) | |
91 | ||
1da177e4 LT |
92 | /* If this is set, the section belongs in the init part of the module */ |
93 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
94 | ||
75676500 RR |
95 | /* |
96 | * Mutex protects: | |
97 | * 1) List of modules (also safely readable with preempt_disable), | |
98 | * 2) module_use links, | |
99 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 100 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
101 | DEFINE_MUTEX(module_mutex); |
102 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 103 | static LIST_HEAD(modules); |
93c2e105 | 104 | |
6c9692e2 PZ |
105 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106 | ||
93c2e105 PZ |
107 | /* |
108 | * Use a latched RB-tree for __module_address(); this allows us to use | |
109 | * RCU-sched lookups of the address from any context. | |
110 | * | |
111 | * Because modules have two address ranges: init and core, we need two | |
112 | * latch_tree_nodes entries. Therefore we need the back-pointer from | |
113 | * mod_tree_node. | |
114 | * | |
115 | * Because init ranges are short lived we mark them unlikely and have placed | |
116 | * them outside the critical cacheline in struct module. | |
6c9692e2 PZ |
117 | * |
118 | * This is conditional on PERF_EVENTS || TRACING because those can really hit | |
119 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
120 | * NMI context. | |
93c2e105 PZ |
121 | */ |
122 | ||
123 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
124 | { | |
125 | struct mod_tree_node *mtn = container_of(n, struct mod_tree_node, node); | |
126 | struct module *mod = mtn->mod; | |
127 | ||
128 | if (unlikely(mtn == &mod->mtn_init)) | |
129 | return (unsigned long)mod->module_init; | |
130 | ||
131 | return (unsigned long)mod->module_core; | |
132 | } | |
133 | ||
134 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
135 | { | |
136 | struct mod_tree_node *mtn = container_of(n, struct mod_tree_node, node); | |
137 | struct module *mod = mtn->mod; | |
138 | ||
139 | if (unlikely(mtn == &mod->mtn_init)) | |
140 | return (unsigned long)mod->init_size; | |
141 | ||
142 | return (unsigned long)mod->core_size; | |
143 | } | |
144 | ||
145 | static __always_inline bool | |
146 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
147 | { | |
148 | return __mod_tree_val(a) < __mod_tree_val(b); | |
149 | } | |
150 | ||
151 | static __always_inline int | |
152 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
153 | { | |
154 | unsigned long val = (unsigned long)key; | |
155 | unsigned long start, end; | |
156 | ||
157 | start = __mod_tree_val(n); | |
158 | if (val < start) | |
159 | return -1; | |
160 | ||
161 | end = start + __mod_tree_size(n); | |
162 | if (val >= end) | |
163 | return 1; | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static const struct latch_tree_ops mod_tree_ops = { | |
169 | .less = mod_tree_less, | |
170 | .comp = mod_tree_comp, | |
171 | }; | |
172 | ||
173 | static struct latch_tree_root mod_tree __cacheline_aligned; | |
174 | ||
175 | /* | |
176 | * These modifications: insert, remove_init and remove; are serialized by the | |
177 | * module_mutex. | |
178 | */ | |
179 | static void mod_tree_insert(struct module *mod) | |
180 | { | |
181 | mod->mtn_core.mod = mod; | |
182 | mod->mtn_init.mod = mod; | |
183 | ||
184 | latch_tree_insert(&mod->mtn_core.node, &mod_tree, &mod_tree_ops); | |
185 | if (mod->init_size) | |
186 | latch_tree_insert(&mod->mtn_init.node, &mod_tree, &mod_tree_ops); | |
187 | } | |
188 | ||
189 | static void mod_tree_remove_init(struct module *mod) | |
190 | { | |
191 | if (mod->init_size) | |
192 | latch_tree_erase(&mod->mtn_init.node, &mod_tree, &mod_tree_ops); | |
193 | } | |
194 | ||
195 | static void mod_tree_remove(struct module *mod) | |
196 | { | |
197 | latch_tree_erase(&mod->mtn_core.node, &mod_tree, &mod_tree_ops); | |
198 | mod_tree_remove_init(mod); | |
199 | } | |
200 | ||
6c9692e2 | 201 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
202 | { |
203 | struct latch_tree_node *ltn; | |
204 | ||
205 | ltn = latch_tree_find((void *)addr, &mod_tree, &mod_tree_ops); | |
206 | if (!ltn) | |
207 | return NULL; | |
208 | ||
209 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
210 | } | |
211 | ||
6c9692e2 PZ |
212 | #else /* MODULES_TREE_LOOKUP */ |
213 | ||
214 | static void mod_tree_insert(struct module *mod) { } | |
215 | static void mod_tree_remove_init(struct module *mod) { } | |
216 | static void mod_tree_remove(struct module *mod) { } | |
217 | ||
218 | static struct module *mod_find(unsigned long addr) | |
219 | { | |
220 | struct module *mod; | |
221 | ||
222 | list_for_each_entry_rcu(mod, &modules, list) { | |
223 | if (within_module(addr, mod)) | |
224 | return mod; | |
225 | } | |
226 | ||
227 | return NULL; | |
228 | } | |
229 | ||
230 | #endif /* MODULES_TREE_LOOKUP */ | |
231 | ||
67fc4e0c JW |
232 | #ifdef CONFIG_KGDB_KDB |
233 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
234 | #endif /* CONFIG_KGDB_KDB */ | |
235 | ||
0be964be PZ |
236 | static void module_assert_mutex(void) |
237 | { | |
238 | lockdep_assert_held(&module_mutex); | |
239 | } | |
240 | ||
241 | static void module_assert_mutex_or_preempt(void) | |
242 | { | |
243 | #ifdef CONFIG_LOCKDEP | |
244 | if (unlikely(!debug_locks)) | |
245 | return; | |
246 | ||
247 | WARN_ON(!rcu_read_lock_sched_held() && | |
248 | !lockdep_is_held(&module_mutex)); | |
249 | #endif | |
250 | } | |
251 | ||
106a4ee2 RR |
252 | #ifdef CONFIG_MODULE_SIG |
253 | #ifdef CONFIG_MODULE_SIG_FORCE | |
254 | static bool sig_enforce = true; | |
255 | #else | |
256 | static bool sig_enforce = false; | |
257 | ||
258 | static int param_set_bool_enable_only(const char *val, | |
259 | const struct kernel_param *kp) | |
260 | { | |
261 | int err; | |
262 | bool test; | |
263 | struct kernel_param dummy_kp = *kp; | |
264 | ||
265 | dummy_kp.arg = &test; | |
266 | ||
267 | err = param_set_bool(val, &dummy_kp); | |
268 | if (err) | |
269 | return err; | |
270 | ||
271 | /* Don't let them unset it once it's set! */ | |
272 | if (!test && sig_enforce) | |
273 | return -EROFS; | |
274 | ||
275 | if (test) | |
276 | sig_enforce = true; | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static const struct kernel_param_ops param_ops_bool_enable_only = { | |
6a4c2643 | 281 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
106a4ee2 RR |
282 | .set = param_set_bool_enable_only, |
283 | .get = param_get_bool, | |
284 | }; | |
285 | #define param_check_bool_enable_only param_check_bool | |
286 | ||
287 | module_param(sig_enforce, bool_enable_only, 0644); | |
288 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
289 | #endif /* CONFIG_MODULE_SIG */ | |
1da177e4 | 290 | |
19e4529e SR |
291 | /* Block module loading/unloading? */ |
292 | int modules_disabled = 0; | |
02608bef | 293 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 294 | |
c9a3ba55 RR |
295 | /* Waiting for a module to finish initializing? */ |
296 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
297 | ||
e041c683 | 298 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 299 | |
75676500 RR |
300 | /* Bounds of module allocation, for speeding __module_address. |
301 | * Protected by module_mutex. */ | |
3a642e99 RR |
302 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
303 | ||
6da0b565 | 304 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 305 | { |
e041c683 | 306 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
307 | } |
308 | EXPORT_SYMBOL(register_module_notifier); | |
309 | ||
6da0b565 | 310 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 311 | { |
e041c683 | 312 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
313 | } |
314 | EXPORT_SYMBOL(unregister_module_notifier); | |
315 | ||
eded41c1 RR |
316 | struct load_info { |
317 | Elf_Ehdr *hdr; | |
318 | unsigned long len; | |
319 | Elf_Shdr *sechdrs; | |
6526c534 | 320 | char *secstrings, *strtab; |
d913188c | 321 | unsigned long symoffs, stroffs; |
811d66a0 RR |
322 | struct _ddebug *debug; |
323 | unsigned int num_debug; | |
106a4ee2 | 324 | bool sig_ok; |
eded41c1 RR |
325 | struct { |
326 | unsigned int sym, str, mod, vers, info, pcpu; | |
327 | } index; | |
328 | }; | |
329 | ||
9a4b9708 ML |
330 | /* We require a truly strong try_module_get(): 0 means failure due to |
331 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
332 | static inline int strong_try_module_get(struct module *mod) |
333 | { | |
0d21b0e3 | 334 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 335 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
336 | return -EBUSY; |
337 | if (try_module_get(mod)) | |
1da177e4 | 338 | return 0; |
c9a3ba55 RR |
339 | else |
340 | return -ENOENT; | |
1da177e4 LT |
341 | } |
342 | ||
373d4d09 RR |
343 | static inline void add_taint_module(struct module *mod, unsigned flag, |
344 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 345 | { |
373d4d09 | 346 | add_taint(flag, lockdep_ok); |
25ddbb18 | 347 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
348 | } |
349 | ||
02a3e59a RD |
350 | /* |
351 | * A thread that wants to hold a reference to a module only while it | |
352 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
353 | */ |
354 | void __module_put_and_exit(struct module *mod, long code) | |
355 | { | |
356 | module_put(mod); | |
357 | do_exit(code); | |
358 | } | |
359 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 360 | |
1da177e4 | 361 | /* Find a module section: 0 means not found. */ |
49668688 | 362 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
363 | { |
364 | unsigned int i; | |
365 | ||
49668688 RR |
366 | for (i = 1; i < info->hdr->e_shnum; i++) { |
367 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 368 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
369 | if ((shdr->sh_flags & SHF_ALLOC) |
370 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 371 | return i; |
49668688 | 372 | } |
1da177e4 LT |
373 | return 0; |
374 | } | |
375 | ||
5e458cc0 | 376 | /* Find a module section, or NULL. */ |
49668688 | 377 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
378 | { |
379 | /* Section 0 has sh_addr 0. */ | |
49668688 | 380 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
381 | } |
382 | ||
383 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 384 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
385 | const char *name, |
386 | size_t object_size, | |
387 | unsigned int *num) | |
388 | { | |
49668688 | 389 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
390 | |
391 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
392 | *num = info->sechdrs[sec].sh_size / object_size; |
393 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
394 | } |
395 | ||
1da177e4 LT |
396 | /* Provided by the linker */ |
397 | extern const struct kernel_symbol __start___ksymtab[]; | |
398 | extern const struct kernel_symbol __stop___ksymtab[]; | |
399 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
400 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
401 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
402 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
403 | extern const unsigned long __start___kcrctab[]; |
404 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 405 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
406 | #ifdef CONFIG_UNUSED_SYMBOLS |
407 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
408 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
409 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
410 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
411 | extern const unsigned long __start___kcrctab_unused[]; |
412 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 413 | #endif |
1da177e4 LT |
414 | |
415 | #ifndef CONFIG_MODVERSIONS | |
416 | #define symversion(base, idx) NULL | |
417 | #else | |
f83ca9fe | 418 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
419 | #endif |
420 | ||
dafd0940 RR |
421 | static bool each_symbol_in_section(const struct symsearch *arr, |
422 | unsigned int arrsize, | |
423 | struct module *owner, | |
424 | bool (*fn)(const struct symsearch *syms, | |
425 | struct module *owner, | |
de4d8d53 | 426 | void *data), |
dafd0940 | 427 | void *data) |
ad9546c9 | 428 | { |
de4d8d53 | 429 | unsigned int j; |
ad9546c9 | 430 | |
dafd0940 | 431 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
432 | if (fn(&arr[j], owner, data)) |
433 | return true; | |
f71d20e9 | 434 | } |
dafd0940 RR |
435 | |
436 | return false; | |
ad9546c9 RR |
437 | } |
438 | ||
dafd0940 | 439 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
440 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
441 | struct module *owner, | |
442 | void *data), | |
443 | void *data) | |
ad9546c9 RR |
444 | { |
445 | struct module *mod; | |
44032e63 | 446 | static const struct symsearch arr[] = { |
ad9546c9 | 447 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 448 | NOT_GPL_ONLY, false }, |
ad9546c9 | 449 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
450 | __start___kcrctab_gpl, |
451 | GPL_ONLY, false }, | |
ad9546c9 | 452 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
453 | __start___kcrctab_gpl_future, |
454 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 455 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 456 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
457 | __start___kcrctab_unused, |
458 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 459 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
460 | __start___kcrctab_unused_gpl, |
461 | GPL_ONLY, true }, | |
f7f5b675 | 462 | #endif |
ad9546c9 | 463 | }; |
f71d20e9 | 464 | |
0be964be PZ |
465 | module_assert_mutex_or_preempt(); |
466 | ||
dafd0940 RR |
467 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
468 | return true; | |
f71d20e9 | 469 | |
d72b3751 | 470 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
471 | struct symsearch arr[] = { |
472 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 473 | NOT_GPL_ONLY, false }, |
ad9546c9 | 474 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
475 | mod->gpl_crcs, |
476 | GPL_ONLY, false }, | |
ad9546c9 RR |
477 | { mod->gpl_future_syms, |
478 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
479 | mod->gpl_future_crcs, |
480 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 481 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
482 | { mod->unused_syms, |
483 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
484 | mod->unused_crcs, |
485 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
486 | { mod->unused_gpl_syms, |
487 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
488 | mod->unused_gpl_crcs, |
489 | GPL_ONLY, true }, | |
f7f5b675 | 490 | #endif |
ad9546c9 RR |
491 | }; |
492 | ||
0d21b0e3 RR |
493 | if (mod->state == MODULE_STATE_UNFORMED) |
494 | continue; | |
495 | ||
dafd0940 RR |
496 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
497 | return true; | |
498 | } | |
499 | return false; | |
500 | } | |
de4d8d53 | 501 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
502 | |
503 | struct find_symbol_arg { | |
504 | /* Input */ | |
505 | const char *name; | |
506 | bool gplok; | |
507 | bool warn; | |
508 | ||
509 | /* Output */ | |
510 | struct module *owner; | |
511 | const unsigned long *crc; | |
414fd31b | 512 | const struct kernel_symbol *sym; |
dafd0940 RR |
513 | }; |
514 | ||
de4d8d53 RR |
515 | static bool check_symbol(const struct symsearch *syms, |
516 | struct module *owner, | |
517 | unsigned int symnum, void *data) | |
dafd0940 RR |
518 | { |
519 | struct find_symbol_arg *fsa = data; | |
520 | ||
dafd0940 RR |
521 | if (!fsa->gplok) { |
522 | if (syms->licence == GPL_ONLY) | |
523 | return false; | |
524 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
525 | pr_warn("Symbol %s is being used by a non-GPL module, " |
526 | "which will not be allowed in the future\n", | |
527 | fsa->name); | |
9f28bb7e | 528 | } |
1da177e4 | 529 | } |
ad9546c9 | 530 | |
f7f5b675 | 531 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 532 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
533 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
534 | "using it.\n", fsa->name); | |
535 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
536 | pr_warn("Please evaluate if this is the right api to use and " |
537 | "if it really is, submit a report to the linux kernel " | |
538 | "mailing list together with submitting your code for " | |
bddb12b3 | 539 | "inclusion.\n"); |
dafd0940 | 540 | } |
f7f5b675 | 541 | #endif |
dafd0940 RR |
542 | |
543 | fsa->owner = owner; | |
544 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 545 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
546 | return true; |
547 | } | |
548 | ||
403ed278 AIB |
549 | static int cmp_name(const void *va, const void *vb) |
550 | { | |
551 | const char *a; | |
552 | const struct kernel_symbol *b; | |
553 | a = va; b = vb; | |
554 | return strcmp(a, b->name); | |
555 | } | |
556 | ||
de4d8d53 RR |
557 | static bool find_symbol_in_section(const struct symsearch *syms, |
558 | struct module *owner, | |
559 | void *data) | |
560 | { | |
561 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
562 | struct kernel_symbol *sym; |
563 | ||
564 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
565 | sizeof(struct kernel_symbol), cmp_name); | |
566 | ||
567 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
568 | return true; | |
de4d8d53 | 569 | |
de4d8d53 RR |
570 | return false; |
571 | } | |
572 | ||
414fd31b | 573 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 574 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
575 | const struct kernel_symbol *find_symbol(const char *name, |
576 | struct module **owner, | |
577 | const unsigned long **crc, | |
578 | bool gplok, | |
579 | bool warn) | |
dafd0940 RR |
580 | { |
581 | struct find_symbol_arg fsa; | |
582 | ||
583 | fsa.name = name; | |
584 | fsa.gplok = gplok; | |
585 | fsa.warn = warn; | |
586 | ||
de4d8d53 | 587 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
588 | if (owner) |
589 | *owner = fsa.owner; | |
590 | if (crc) | |
591 | *crc = fsa.crc; | |
414fd31b | 592 | return fsa.sym; |
dafd0940 RR |
593 | } |
594 | ||
5e124169 | 595 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 596 | return NULL; |
1da177e4 | 597 | } |
c6b37801 | 598 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 599 | |
1da177e4 | 600 | /* Search for module by name: must hold module_mutex. */ |
4f6de4d5 | 601 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 602 | bool even_unformed) |
1da177e4 LT |
603 | { |
604 | struct module *mod; | |
605 | ||
0be964be PZ |
606 | module_assert_mutex(); |
607 | ||
1da177e4 | 608 | list_for_each_entry(mod, &modules, list) { |
0d21b0e3 RR |
609 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
610 | continue; | |
4f6de4d5 | 611 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
612 | return mod; |
613 | } | |
614 | return NULL; | |
615 | } | |
0d21b0e3 RR |
616 | |
617 | struct module *find_module(const char *name) | |
618 | { | |
4f6de4d5 | 619 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 620 | } |
c6b37801 | 621 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
622 | |
623 | #ifdef CONFIG_SMP | |
fbf59bc9 | 624 | |
259354de | 625 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 626 | { |
259354de TH |
627 | return mod->percpu; |
628 | } | |
fbf59bc9 | 629 | |
9eb76d77 | 630 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 631 | { |
9eb76d77 RR |
632 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
633 | unsigned long align = pcpusec->sh_addralign; | |
634 | ||
635 | if (!pcpusec->sh_size) | |
636 | return 0; | |
637 | ||
fbf59bc9 | 638 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
639 | pr_warn("%s: per-cpu alignment %li > %li\n", |
640 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
641 | align = PAGE_SIZE; |
642 | } | |
643 | ||
9eb76d77 | 644 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 645 | if (!mod->percpu) { |
bddb12b3 AM |
646 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
647 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
648 | return -ENOMEM; |
649 | } | |
9eb76d77 | 650 | mod->percpu_size = pcpusec->sh_size; |
259354de | 651 | return 0; |
fbf59bc9 TH |
652 | } |
653 | ||
259354de | 654 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 655 | { |
259354de | 656 | free_percpu(mod->percpu); |
fbf59bc9 TH |
657 | } |
658 | ||
49668688 | 659 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 660 | { |
49668688 | 661 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
662 | } |
663 | ||
259354de TH |
664 | static void percpu_modcopy(struct module *mod, |
665 | const void *from, unsigned long size) | |
6b588c18 TH |
666 | { |
667 | int cpu; | |
668 | ||
669 | for_each_possible_cpu(cpu) | |
259354de | 670 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
671 | } |
672 | ||
10fad5e4 TH |
673 | /** |
674 | * is_module_percpu_address - test whether address is from module static percpu | |
675 | * @addr: address to test | |
676 | * | |
677 | * Test whether @addr belongs to module static percpu area. | |
678 | * | |
679 | * RETURNS: | |
680 | * %true if @addr is from module static percpu area | |
681 | */ | |
682 | bool is_module_percpu_address(unsigned long addr) | |
683 | { | |
684 | struct module *mod; | |
685 | unsigned int cpu; | |
686 | ||
687 | preempt_disable(); | |
688 | ||
689 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
690 | if (mod->state == MODULE_STATE_UNFORMED) |
691 | continue; | |
10fad5e4 TH |
692 | if (!mod->percpu_size) |
693 | continue; | |
694 | for_each_possible_cpu(cpu) { | |
695 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
696 | ||
697 | if ((void *)addr >= start && | |
698 | (void *)addr < start + mod->percpu_size) { | |
699 | preempt_enable(); | |
700 | return true; | |
701 | } | |
702 | } | |
703 | } | |
704 | ||
705 | preempt_enable(); | |
706 | return false; | |
6b588c18 TH |
707 | } |
708 | ||
1da177e4 | 709 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 710 | |
259354de | 711 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
712 | { |
713 | return NULL; | |
714 | } | |
9eb76d77 | 715 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 716 | { |
9eb76d77 RR |
717 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
718 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
719 | return -ENOMEM; | |
720 | return 0; | |
259354de TH |
721 | } |
722 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 723 | { |
1da177e4 | 724 | } |
49668688 | 725 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
726 | { |
727 | return 0; | |
728 | } | |
259354de TH |
729 | static inline void percpu_modcopy(struct module *mod, |
730 | const void *from, unsigned long size) | |
1da177e4 LT |
731 | { |
732 | /* pcpusec should be 0, and size of that section should be 0. */ | |
733 | BUG_ON(size != 0); | |
734 | } | |
10fad5e4 TH |
735 | bool is_module_percpu_address(unsigned long addr) |
736 | { | |
737 | return false; | |
738 | } | |
6b588c18 | 739 | |
1da177e4 LT |
740 | #endif /* CONFIG_SMP */ |
741 | ||
c988d2b2 MD |
742 | #define MODINFO_ATTR(field) \ |
743 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
744 | { \ | |
745 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
746 | } \ | |
747 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 748 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 749 | { \ |
cc56ded3 | 750 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
751 | } \ |
752 | static int modinfo_##field##_exists(struct module *mod) \ | |
753 | { \ | |
754 | return mod->field != NULL; \ | |
755 | } \ | |
756 | static void free_modinfo_##field(struct module *mod) \ | |
757 | { \ | |
22a8bdeb DW |
758 | kfree(mod->field); \ |
759 | mod->field = NULL; \ | |
c988d2b2 MD |
760 | } \ |
761 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 762 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
763 | .show = show_modinfo_##field, \ |
764 | .setup = setup_modinfo_##field, \ | |
765 | .test = modinfo_##field##_exists, \ | |
766 | .free = free_modinfo_##field, \ | |
767 | }; | |
768 | ||
769 | MODINFO_ATTR(version); | |
770 | MODINFO_ATTR(srcversion); | |
771 | ||
e14af7ee AV |
772 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
773 | ||
03e88ae1 | 774 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
775 | |
776 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
777 | ||
e513cc1c MH |
778 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
779 | #define MODULE_REF_BASE 1 | |
780 | ||
1da177e4 | 781 | /* Init the unload section of the module. */ |
9f85a4bb | 782 | static int module_unload_init(struct module *mod) |
1da177e4 | 783 | { |
e513cc1c MH |
784 | /* |
785 | * Initialize reference counter to MODULE_REF_BASE. | |
786 | * refcnt == 0 means module is going. | |
787 | */ | |
788 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 789 | |
2c02dfe7 LT |
790 | INIT_LIST_HEAD(&mod->source_list); |
791 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 792 | |
1da177e4 | 793 | /* Hold reference count during initialization. */ |
e513cc1c | 794 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
795 | |
796 | return 0; | |
1da177e4 LT |
797 | } |
798 | ||
1da177e4 LT |
799 | /* Does a already use b? */ |
800 | static int already_uses(struct module *a, struct module *b) | |
801 | { | |
802 | struct module_use *use; | |
803 | ||
2c02dfe7 LT |
804 | list_for_each_entry(use, &b->source_list, source_list) { |
805 | if (use->source == a) { | |
5e124169 | 806 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
807 | return 1; |
808 | } | |
809 | } | |
5e124169 | 810 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
811 | return 0; |
812 | } | |
813 | ||
2c02dfe7 LT |
814 | /* |
815 | * Module a uses b | |
816 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
817 | * - the module_use is added to the list of 'b' sources (so | |
818 | * 'b' can walk the list to see who sourced them), and of 'a' | |
819 | * targets (so 'a' can see what modules it targets). | |
820 | */ | |
821 | static int add_module_usage(struct module *a, struct module *b) | |
822 | { | |
2c02dfe7 LT |
823 | struct module_use *use; |
824 | ||
5e124169 | 825 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
826 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
827 | if (!use) { | |
bddb12b3 | 828 | pr_warn("%s: out of memory loading\n", a->name); |
2c02dfe7 LT |
829 | return -ENOMEM; |
830 | } | |
831 | ||
832 | use->source = a; | |
833 | use->target = b; | |
834 | list_add(&use->source_list, &b->source_list); | |
835 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
836 | return 0; |
837 | } | |
838 | ||
75676500 | 839 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 840 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 841 | { |
c8e21ced | 842 | int err; |
270a6c4c | 843 | |
9bea7f23 | 844 | if (b == NULL || already_uses(a, b)) |
218ce735 | 845 | return 0; |
218ce735 | 846 | |
9bea7f23 RR |
847 | /* If module isn't available, we fail. */ |
848 | err = strong_try_module_get(b); | |
c9a3ba55 | 849 | if (err) |
9bea7f23 | 850 | return err; |
1da177e4 | 851 | |
2c02dfe7 LT |
852 | err = add_module_usage(a, b); |
853 | if (err) { | |
1da177e4 | 854 | module_put(b); |
9bea7f23 | 855 | return err; |
1da177e4 | 856 | } |
9bea7f23 | 857 | return 0; |
1da177e4 | 858 | } |
9bea7f23 | 859 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
860 | |
861 | /* Clear the unload stuff of the module. */ | |
862 | static void module_unload_free(struct module *mod) | |
863 | { | |
2c02dfe7 | 864 | struct module_use *use, *tmp; |
1da177e4 | 865 | |
75676500 | 866 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
867 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
868 | struct module *i = use->target; | |
5e124169 | 869 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
870 | module_put(i); |
871 | list_del(&use->source_list); | |
872 | list_del(&use->target_list); | |
873 | kfree(use); | |
1da177e4 | 874 | } |
75676500 | 875 | mutex_unlock(&module_mutex); |
1da177e4 LT |
876 | } |
877 | ||
878 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 879 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
880 | { |
881 | int ret = (flags & O_TRUNC); | |
882 | if (ret) | |
373d4d09 | 883 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
884 | return ret; |
885 | } | |
886 | #else | |
fb169793 | 887 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
888 | { |
889 | return 0; | |
890 | } | |
891 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
892 | ||
e513cc1c MH |
893 | /* Try to release refcount of module, 0 means success. */ |
894 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 895 | { |
e513cc1c | 896 | int ret; |
1da177e4 | 897 | |
e513cc1c MH |
898 | /* Try to decrement refcnt which we set at loading */ |
899 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
900 | BUG_ON(ret < 0); | |
901 | if (ret) | |
902 | /* Someone can put this right now, recover with checking */ | |
903 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 904 | |
e513cc1c MH |
905 | return ret; |
906 | } | |
1da177e4 | 907 | |
e513cc1c MH |
908 | static int try_stop_module(struct module *mod, int flags, int *forced) |
909 | { | |
da39ba5e | 910 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
911 | if (try_release_module_ref(mod) != 0) { |
912 | *forced = try_force_unload(flags); | |
913 | if (!(*forced)) | |
1da177e4 LT |
914 | return -EWOULDBLOCK; |
915 | } | |
916 | ||
917 | /* Mark it as dying. */ | |
e513cc1c | 918 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 919 | |
e513cc1c | 920 | return 0; |
1da177e4 LT |
921 | } |
922 | ||
d5db139a RR |
923 | /** |
924 | * module_refcount - return the refcount or -1 if unloading | |
925 | * | |
926 | * @mod: the module we're checking | |
927 | * | |
928 | * Returns: | |
929 | * -1 if the module is in the process of unloading | |
930 | * otherwise the number of references in the kernel to the module | |
931 | */ | |
932 | int module_refcount(struct module *mod) | |
1da177e4 | 933 | { |
d5db139a | 934 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
935 | } |
936 | EXPORT_SYMBOL(module_refcount); | |
937 | ||
938 | /* This exists whether we can unload or not */ | |
939 | static void free_module(struct module *mod); | |
940 | ||
17da2bd9 HC |
941 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
942 | unsigned int, flags) | |
1da177e4 LT |
943 | { |
944 | struct module *mod; | |
dfff0a06 | 945 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
946 | int ret, forced = 0; |
947 | ||
3d43321b | 948 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
949 | return -EPERM; |
950 | ||
951 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
952 | return -EFAULT; | |
953 | name[MODULE_NAME_LEN-1] = '\0'; | |
954 | ||
3fc1f1e2 TH |
955 | if (mutex_lock_interruptible(&module_mutex) != 0) |
956 | return -EINTR; | |
1da177e4 LT |
957 | |
958 | mod = find_module(name); | |
959 | if (!mod) { | |
960 | ret = -ENOENT; | |
961 | goto out; | |
962 | } | |
963 | ||
2c02dfe7 | 964 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
965 | /* Other modules depend on us: get rid of them first. */ |
966 | ret = -EWOULDBLOCK; | |
967 | goto out; | |
968 | } | |
969 | ||
970 | /* Doing init or already dying? */ | |
971 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 972 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 973 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
974 | ret = -EBUSY; |
975 | goto out; | |
976 | } | |
977 | ||
978 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 979 | if (mod->init && !mod->exit) { |
fb169793 | 980 | forced = try_force_unload(flags); |
1da177e4 LT |
981 | if (!forced) { |
982 | /* This module can't be removed */ | |
983 | ret = -EBUSY; | |
984 | goto out; | |
985 | } | |
986 | } | |
987 | ||
1da177e4 LT |
988 | /* Stop the machine so refcounts can't move and disable module. */ |
989 | ret = try_stop_module(mod, flags, &forced); | |
990 | if (ret != 0) | |
991 | goto out; | |
992 | ||
df4b565e | 993 | mutex_unlock(&module_mutex); |
25985edc | 994 | /* Final destruction now no one is using it. */ |
df4b565e | 995 | if (mod->exit != NULL) |
1da177e4 | 996 | mod->exit(); |
df4b565e PO |
997 | blocking_notifier_call_chain(&module_notify_list, |
998 | MODULE_STATE_GOING, mod); | |
22a9d645 | 999 | async_synchronize_full(); |
75676500 | 1000 | |
e14af7ee | 1001 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1002 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1003 | |
75676500 RR |
1004 | free_module(mod); |
1005 | return 0; | |
1006 | out: | |
6389a385 | 1007 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1008 | return ret; |
1009 | } | |
1010 | ||
d1e99d7a | 1011 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1012 | { |
1013 | struct module_use *use; | |
1014 | int printed_something = 0; | |
1015 | ||
d5db139a | 1016 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1017 | |
6da0b565 IA |
1018 | /* |
1019 | * Always include a trailing , so userspace can differentiate | |
1020 | * between this and the old multi-field proc format. | |
1021 | */ | |
2c02dfe7 | 1022 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1023 | printed_something = 1; |
2c02dfe7 | 1024 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1025 | } |
1026 | ||
1da177e4 LT |
1027 | if (mod->init != NULL && mod->exit == NULL) { |
1028 | printed_something = 1; | |
6da0b565 | 1029 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | if (!printed_something) | |
6da0b565 | 1033 | seq_puts(m, "-"); |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | void __symbol_put(const char *symbol) | |
1037 | { | |
1038 | struct module *owner; | |
1da177e4 | 1039 | |
24da1cbf | 1040 | preempt_disable(); |
414fd31b | 1041 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1042 | BUG(); |
1043 | module_put(owner); | |
24da1cbf | 1044 | preempt_enable(); |
1da177e4 LT |
1045 | } |
1046 | EXPORT_SYMBOL(__symbol_put); | |
1047 | ||
7d1d16e4 | 1048 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1049 | void symbol_put_addr(void *addr) |
1050 | { | |
5e376613 | 1051 | struct module *modaddr; |
7d1d16e4 | 1052 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1053 | |
7d1d16e4 | 1054 | if (core_kernel_text(a)) |
5e376613 | 1055 | return; |
1da177e4 | 1056 | |
a6e6abd5 RR |
1057 | /* module_text_address is safe here: we're supposed to have reference |
1058 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 1059 | modaddr = __module_text_address(a); |
a6e6abd5 | 1060 | BUG_ON(!modaddr); |
5e376613 | 1061 | module_put(modaddr); |
1da177e4 LT |
1062 | } |
1063 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1064 | ||
1065 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1066 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1067 | { |
d5db139a | 1068 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1069 | } |
1070 | ||
cca3e707 KS |
1071 | static struct module_attribute modinfo_refcnt = |
1072 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1073 | |
d53799be SR |
1074 | void __module_get(struct module *module) |
1075 | { | |
1076 | if (module) { | |
1077 | preempt_disable(); | |
2f35c41f | 1078 | atomic_inc(&module->refcnt); |
d53799be SR |
1079 | trace_module_get(module, _RET_IP_); |
1080 | preempt_enable(); | |
1081 | } | |
1082 | } | |
1083 | EXPORT_SYMBOL(__module_get); | |
1084 | ||
1085 | bool try_module_get(struct module *module) | |
1086 | { | |
1087 | bool ret = true; | |
1088 | ||
1089 | if (module) { | |
1090 | preempt_disable(); | |
e513cc1c MH |
1091 | /* Note: here, we can fail to get a reference */ |
1092 | if (likely(module_is_live(module) && | |
1093 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1094 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1095 | else |
d53799be SR |
1096 | ret = false; |
1097 | ||
1098 | preempt_enable(); | |
1099 | } | |
1100 | return ret; | |
1101 | } | |
1102 | EXPORT_SYMBOL(try_module_get); | |
1103 | ||
f6a57033 AV |
1104 | void module_put(struct module *module) |
1105 | { | |
e513cc1c MH |
1106 | int ret; |
1107 | ||
f6a57033 | 1108 | if (module) { |
e1783a24 | 1109 | preempt_disable(); |
e513cc1c MH |
1110 | ret = atomic_dec_if_positive(&module->refcnt); |
1111 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1112 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1113 | preempt_enable(); |
f6a57033 AV |
1114 | } |
1115 | } | |
1116 | EXPORT_SYMBOL(module_put); | |
1117 | ||
1da177e4 | 1118 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1119 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1120 | { |
1121 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1122 | seq_puts(m, " - -"); |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | static inline void module_unload_free(struct module *mod) | |
1126 | { | |
1127 | } | |
1128 | ||
9bea7f23 | 1129 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1130 | { |
9bea7f23 | 1131 | return strong_try_module_get(b); |
1da177e4 | 1132 | } |
9bea7f23 | 1133 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1134 | |
9f85a4bb | 1135 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1136 | { |
9f85a4bb | 1137 | return 0; |
1da177e4 LT |
1138 | } |
1139 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1140 | ||
53999bf3 KW |
1141 | static size_t module_flags_taint(struct module *mod, char *buf) |
1142 | { | |
1143 | size_t l = 0; | |
1144 | ||
1145 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) | |
1146 | buf[l++] = 'P'; | |
1147 | if (mod->taints & (1 << TAINT_OOT_MODULE)) | |
1148 | buf[l++] = 'O'; | |
1149 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) | |
1150 | buf[l++] = 'F'; | |
1151 | if (mod->taints & (1 << TAINT_CRAP)) | |
1152 | buf[l++] = 'C'; | |
66cc69e3 | 1153 | if (mod->taints & (1 << TAINT_UNSIGNED_MODULE)) |
57673c2b | 1154 | buf[l++] = 'E'; |
53999bf3 KW |
1155 | /* |
1156 | * TAINT_FORCED_RMMOD: could be added. | |
8c90487c | 1157 | * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
53999bf3 KW |
1158 | * apply to modules. |
1159 | */ | |
1160 | return l; | |
1161 | } | |
1162 | ||
1f71740a | 1163 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1164 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1165 | { |
1166 | const char *state = "unknown"; | |
1167 | ||
4befb026 | 1168 | switch (mk->mod->state) { |
1f71740a KS |
1169 | case MODULE_STATE_LIVE: |
1170 | state = "live"; | |
1171 | break; | |
1172 | case MODULE_STATE_COMING: | |
1173 | state = "coming"; | |
1174 | break; | |
1175 | case MODULE_STATE_GOING: | |
1176 | state = "going"; | |
1177 | break; | |
0d21b0e3 RR |
1178 | default: |
1179 | BUG(); | |
1f71740a KS |
1180 | } |
1181 | return sprintf(buffer, "%s\n", state); | |
1182 | } | |
1183 | ||
cca3e707 KS |
1184 | static struct module_attribute modinfo_initstate = |
1185 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1186 | |
88bfa324 KS |
1187 | static ssize_t store_uevent(struct module_attribute *mattr, |
1188 | struct module_kobject *mk, | |
1189 | const char *buffer, size_t count) | |
1190 | { | |
1191 | enum kobject_action action; | |
1192 | ||
1193 | if (kobject_action_type(buffer, count, &action) == 0) | |
1194 | kobject_uevent(&mk->kobj, action); | |
1195 | return count; | |
1196 | } | |
1197 | ||
cca3e707 KS |
1198 | struct module_attribute module_uevent = |
1199 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1200 | ||
1201 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1202 | struct module_kobject *mk, char *buffer) | |
1203 | { | |
1204 | return sprintf(buffer, "%u\n", mk->mod->core_size); | |
1205 | } | |
1206 | ||
1207 | static struct module_attribute modinfo_coresize = | |
1208 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1209 | ||
1210 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1211 | struct module_kobject *mk, char *buffer) | |
1212 | { | |
1213 | return sprintf(buffer, "%u\n", mk->mod->init_size); | |
1214 | } | |
1215 | ||
1216 | static struct module_attribute modinfo_initsize = | |
1217 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1218 | ||
1219 | static ssize_t show_taint(struct module_attribute *mattr, | |
1220 | struct module_kobject *mk, char *buffer) | |
1221 | { | |
1222 | size_t l; | |
1223 | ||
1224 | l = module_flags_taint(mk->mod, buffer); | |
1225 | buffer[l++] = '\n'; | |
1226 | return l; | |
1227 | } | |
1228 | ||
1229 | static struct module_attribute modinfo_taint = | |
1230 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1231 | |
03e88ae1 | 1232 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1233 | &module_uevent, |
03e88ae1 GKH |
1234 | &modinfo_version, |
1235 | &modinfo_srcversion, | |
cca3e707 KS |
1236 | &modinfo_initstate, |
1237 | &modinfo_coresize, | |
1238 | &modinfo_initsize, | |
1239 | &modinfo_taint, | |
03e88ae1 | 1240 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1241 | &modinfo_refcnt, |
03e88ae1 GKH |
1242 | #endif |
1243 | NULL, | |
1244 | }; | |
1245 | ||
1da177e4 LT |
1246 | static const char vermagic[] = VERMAGIC_STRING; |
1247 | ||
c6e665c8 | 1248 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1249 | { |
1250 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1251 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1252 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1253 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1254 | return 0; |
1255 | #else | |
1256 | return -ENOEXEC; | |
1257 | #endif | |
1258 | } | |
1259 | ||
1da177e4 | 1260 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
1261 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1262 | static unsigned long maybe_relocated(unsigned long crc, | |
1263 | const struct module *crc_owner) | |
1264 | { | |
1265 | #ifdef ARCH_RELOCATES_KCRCTAB | |
1266 | if (crc_owner == NULL) | |
1267 | return crc - (unsigned long)reloc_start; | |
1268 | #endif | |
1269 | return crc; | |
1270 | } | |
1271 | ||
1da177e4 LT |
1272 | static int check_version(Elf_Shdr *sechdrs, |
1273 | unsigned int versindex, | |
1274 | const char *symname, | |
6da0b565 | 1275 | struct module *mod, |
d4703aef RR |
1276 | const unsigned long *crc, |
1277 | const struct module *crc_owner) | |
1da177e4 LT |
1278 | { |
1279 | unsigned int i, num_versions; | |
1280 | struct modversion_info *versions; | |
1281 | ||
1282 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1283 | if (!crc) | |
1284 | return 1; | |
1285 | ||
a5dd6970 RR |
1286 | /* No versions at all? modprobe --force does this. */ |
1287 | if (versindex == 0) | |
1288 | return try_to_force_load(mod, symname) == 0; | |
1289 | ||
1da177e4 LT |
1290 | versions = (void *) sechdrs[versindex].sh_addr; |
1291 | num_versions = sechdrs[versindex].sh_size | |
1292 | / sizeof(struct modversion_info); | |
1293 | ||
1294 | for (i = 0; i < num_versions; i++) { | |
1295 | if (strcmp(versions[i].name, symname) != 0) | |
1296 | continue; | |
1297 | ||
d4703aef | 1298 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1299 | return 1; |
5e124169 | 1300 | pr_debug("Found checksum %lX vs module %lX\n", |
d4703aef | 1301 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1302 | goto bad_version; |
1da177e4 | 1303 | } |
826e4506 | 1304 | |
bddb12b3 | 1305 | pr_warn("%s: no symbol version for %s\n", mod->name, symname); |
a5dd6970 | 1306 | return 0; |
826e4506 LT |
1307 | |
1308 | bad_version: | |
6da0b565 | 1309 | pr_warn("%s: disagrees about version of symbol %s\n", |
826e4506 LT |
1310 | mod->name, symname); |
1311 | return 0; | |
1da177e4 LT |
1312 | } |
1313 | ||
1314 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1315 | unsigned int versindex, | |
1316 | struct module *mod) | |
1317 | { | |
1318 | const unsigned long *crc; | |
1da177e4 | 1319 | |
926a59b1 PZ |
1320 | /* |
1321 | * Since this should be found in kernel (which can't be removed), no | |
1322 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1323 | */ | |
1324 | preempt_disable(); | |
b92021b0 | 1325 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
926a59b1 PZ |
1326 | &crc, true, false)) { |
1327 | preempt_enable(); | |
1da177e4 | 1328 | BUG(); |
926a59b1 PZ |
1329 | } |
1330 | preempt_enable(); | |
a4b6a77b JH |
1331 | return check_version(sechdrs, versindex, |
1332 | VMLINUX_SYMBOL_STR(module_layout), mod, crc, | |
d4703aef | 1333 | NULL); |
1da177e4 LT |
1334 | } |
1335 | ||
91e37a79 RR |
1336 | /* First part is kernel version, which we ignore if module has crcs. */ |
1337 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1338 | bool has_crcs) | |
1da177e4 | 1339 | { |
91e37a79 RR |
1340 | if (has_crcs) { |
1341 | amagic += strcspn(amagic, " "); | |
1342 | bmagic += strcspn(bmagic, " "); | |
1343 | } | |
1da177e4 LT |
1344 | return strcmp(amagic, bmagic) == 0; |
1345 | } | |
1346 | #else | |
1347 | static inline int check_version(Elf_Shdr *sechdrs, | |
1348 | unsigned int versindex, | |
1349 | const char *symname, | |
6da0b565 | 1350 | struct module *mod, |
d4703aef RR |
1351 | const unsigned long *crc, |
1352 | const struct module *crc_owner) | |
1da177e4 LT |
1353 | { |
1354 | return 1; | |
1355 | } | |
1356 | ||
1357 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1358 | unsigned int versindex, | |
1359 | struct module *mod) | |
1360 | { | |
1361 | return 1; | |
1362 | } | |
1363 | ||
91e37a79 RR |
1364 | static inline int same_magic(const char *amagic, const char *bmagic, |
1365 | bool has_crcs) | |
1da177e4 LT |
1366 | { |
1367 | return strcmp(amagic, bmagic) == 0; | |
1368 | } | |
1369 | #endif /* CONFIG_MODVERSIONS */ | |
1370 | ||
75676500 | 1371 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1372 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1373 | const struct load_info *info, | |
414fd31b | 1374 | const char *name, |
9bea7f23 | 1375 | char ownername[]) |
1da177e4 LT |
1376 | { |
1377 | struct module *owner; | |
414fd31b | 1378 | const struct kernel_symbol *sym; |
1da177e4 | 1379 | const unsigned long *crc; |
9bea7f23 | 1380 | int err; |
1da177e4 | 1381 | |
d64810f5 PZ |
1382 | /* |
1383 | * The module_mutex should not be a heavily contended lock; | |
1384 | * if we get the occasional sleep here, we'll go an extra iteration | |
1385 | * in the wait_event_interruptible(), which is harmless. | |
1386 | */ | |
1387 | sched_annotate_sleep(); | |
75676500 | 1388 | mutex_lock(&module_mutex); |
414fd31b | 1389 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1390 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1391 | if (!sym) |
1392 | goto unlock; | |
1393 | ||
49668688 RR |
1394 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1395 | owner)) { | |
9bea7f23 RR |
1396 | sym = ERR_PTR(-EINVAL); |
1397 | goto getname; | |
1da177e4 | 1398 | } |
9bea7f23 RR |
1399 | |
1400 | err = ref_module(mod, owner); | |
1401 | if (err) { | |
1402 | sym = ERR_PTR(err); | |
1403 | goto getname; | |
1404 | } | |
1405 | ||
1406 | getname: | |
1407 | /* We must make copy under the lock if we failed to get ref. */ | |
1408 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1409 | unlock: | |
75676500 | 1410 | mutex_unlock(&module_mutex); |
218ce735 | 1411 | return sym; |
1da177e4 LT |
1412 | } |
1413 | ||
49668688 RR |
1414 | static const struct kernel_symbol * |
1415 | resolve_symbol_wait(struct module *mod, | |
1416 | const struct load_info *info, | |
1417 | const char *name) | |
9bea7f23 RR |
1418 | { |
1419 | const struct kernel_symbol *ksym; | |
49668688 | 1420 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1421 | |
1422 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1423 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1424 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1425 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1426 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1427 | mod->name, owner); | |
9bea7f23 RR |
1428 | } |
1429 | return ksym; | |
1430 | } | |
1431 | ||
1da177e4 LT |
1432 | /* |
1433 | * /sys/module/foo/sections stuff | |
1434 | * J. Corbet <corbet@lwn.net> | |
1435 | */ | |
8f6d0378 | 1436 | #ifdef CONFIG_SYSFS |
10b465aa | 1437 | |
8f6d0378 | 1438 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1439 | static inline bool sect_empty(const Elf_Shdr *sect) |
1440 | { | |
1441 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1442 | } | |
1443 | ||
6da0b565 | 1444 | struct module_sect_attr { |
a58730c4 RR |
1445 | struct module_attribute mattr; |
1446 | char *name; | |
1447 | unsigned long address; | |
1448 | }; | |
1449 | ||
6da0b565 | 1450 | struct module_sect_attrs { |
a58730c4 RR |
1451 | struct attribute_group grp; |
1452 | unsigned int nsections; | |
1453 | struct module_sect_attr attrs[0]; | |
1454 | }; | |
1455 | ||
1da177e4 | 1456 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1457 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1458 | { |
1459 | struct module_sect_attr *sattr = | |
1460 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1461 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1462 | } |
1463 | ||
04b1db9f IN |
1464 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1465 | { | |
a58730c4 | 1466 | unsigned int section; |
04b1db9f IN |
1467 | |
1468 | for (section = 0; section < sect_attrs->nsections; section++) | |
1469 | kfree(sect_attrs->attrs[section].name); | |
1470 | kfree(sect_attrs); | |
1471 | } | |
1472 | ||
8f6d0378 | 1473 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1474 | { |
1475 | unsigned int nloaded = 0, i, size[2]; | |
1476 | struct module_sect_attrs *sect_attrs; | |
1477 | struct module_sect_attr *sattr; | |
1478 | struct attribute **gattr; | |
22a8bdeb | 1479 | |
1da177e4 | 1480 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1481 | for (i = 0; i < info->hdr->e_shnum; i++) |
1482 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1483 | nloaded++; |
1484 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1485 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1486 | sizeof(sect_attrs->grp.attrs[0])); | |
1487 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1488 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1489 | if (sect_attrs == NULL) | |
1da177e4 LT |
1490 | return; |
1491 | ||
1492 | /* Setup section attributes. */ | |
1493 | sect_attrs->grp.name = "sections"; | |
1494 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1495 | ||
04b1db9f | 1496 | sect_attrs->nsections = 0; |
1da177e4 LT |
1497 | sattr = §_attrs->attrs[0]; |
1498 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1499 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1500 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1501 | if (sect_empty(sec)) | |
35dead42 | 1502 | continue; |
8f6d0378 RR |
1503 | sattr->address = sec->sh_addr; |
1504 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1505 | GFP_KERNEL); |
1506 | if (sattr->name == NULL) | |
1507 | goto out; | |
1508 | sect_attrs->nsections++; | |
361795b1 | 1509 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1510 | sattr->mattr.show = module_sect_show; |
1511 | sattr->mattr.store = NULL; | |
1512 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1513 | sattr->mattr.attr.mode = S_IRUGO; |
1514 | *(gattr++) = &(sattr++)->mattr.attr; | |
1515 | } | |
1516 | *gattr = NULL; | |
1517 | ||
1518 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1519 | goto out; | |
1520 | ||
1521 | mod->sect_attrs = sect_attrs; | |
1522 | return; | |
1523 | out: | |
04b1db9f | 1524 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1525 | } |
1526 | ||
1527 | static void remove_sect_attrs(struct module *mod) | |
1528 | { | |
1529 | if (mod->sect_attrs) { | |
1530 | sysfs_remove_group(&mod->mkobj.kobj, | |
1531 | &mod->sect_attrs->grp); | |
1532 | /* We are positive that no one is using any sect attrs | |
1533 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1534 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1535 | mod->sect_attrs = NULL; |
1536 | } | |
1537 | } | |
1538 | ||
6d760133 RM |
1539 | /* |
1540 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1541 | */ | |
1542 | ||
1543 | struct module_notes_attrs { | |
1544 | struct kobject *dir; | |
1545 | unsigned int notes; | |
1546 | struct bin_attribute attrs[0]; | |
1547 | }; | |
1548 | ||
2c3c8bea | 1549 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1550 | struct bin_attribute *bin_attr, |
1551 | char *buf, loff_t pos, size_t count) | |
1552 | { | |
1553 | /* | |
1554 | * The caller checked the pos and count against our size. | |
1555 | */ | |
1556 | memcpy(buf, bin_attr->private + pos, count); | |
1557 | return count; | |
1558 | } | |
1559 | ||
1560 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1561 | unsigned int i) | |
1562 | { | |
1563 | if (notes_attrs->dir) { | |
1564 | while (i-- > 0) | |
1565 | sysfs_remove_bin_file(notes_attrs->dir, | |
1566 | ¬es_attrs->attrs[i]); | |
e9432093 | 1567 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1568 | } |
1569 | kfree(notes_attrs); | |
1570 | } | |
1571 | ||
8f6d0378 | 1572 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1573 | { |
1574 | unsigned int notes, loaded, i; | |
1575 | struct module_notes_attrs *notes_attrs; | |
1576 | struct bin_attribute *nattr; | |
1577 | ||
ea6bff36 IM |
1578 | /* failed to create section attributes, so can't create notes */ |
1579 | if (!mod->sect_attrs) | |
1580 | return; | |
1581 | ||
6d760133 RM |
1582 | /* Count notes sections and allocate structures. */ |
1583 | notes = 0; | |
8f6d0378 RR |
1584 | for (i = 0; i < info->hdr->e_shnum; i++) |
1585 | if (!sect_empty(&info->sechdrs[i]) && | |
1586 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1587 | ++notes; |
1588 | ||
1589 | if (notes == 0) | |
1590 | return; | |
1591 | ||
1592 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1593 | + notes * sizeof(notes_attrs->attrs[0]), | |
1594 | GFP_KERNEL); | |
1595 | if (notes_attrs == NULL) | |
1596 | return; | |
1597 | ||
1598 | notes_attrs->notes = notes; | |
1599 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1600 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1601 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1602 | continue; |
8f6d0378 | 1603 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1604 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1605 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1606 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1607 | nattr->size = info->sechdrs[i].sh_size; |
1608 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1609 | nattr->read = module_notes_read; |
1610 | ++nattr; | |
1611 | } | |
1612 | ++loaded; | |
1613 | } | |
1614 | ||
4ff6abff | 1615 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1616 | if (!notes_attrs->dir) |
1617 | goto out; | |
1618 | ||
1619 | for (i = 0; i < notes; ++i) | |
1620 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1621 | ¬es_attrs->attrs[i])) | |
1622 | goto out; | |
1623 | ||
1624 | mod->notes_attrs = notes_attrs; | |
1625 | return; | |
1626 | ||
1627 | out: | |
1628 | free_notes_attrs(notes_attrs, i); | |
1629 | } | |
1630 | ||
1631 | static void remove_notes_attrs(struct module *mod) | |
1632 | { | |
1633 | if (mod->notes_attrs) | |
1634 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1635 | } | |
1636 | ||
1da177e4 | 1637 | #else |
04b1db9f | 1638 | |
8f6d0378 RR |
1639 | static inline void add_sect_attrs(struct module *mod, |
1640 | const struct load_info *info) | |
1da177e4 LT |
1641 | { |
1642 | } | |
1643 | ||
1644 | static inline void remove_sect_attrs(struct module *mod) | |
1645 | { | |
1646 | } | |
6d760133 | 1647 | |
8f6d0378 RR |
1648 | static inline void add_notes_attrs(struct module *mod, |
1649 | const struct load_info *info) | |
6d760133 RM |
1650 | { |
1651 | } | |
1652 | ||
1653 | static inline void remove_notes_attrs(struct module *mod) | |
1654 | { | |
1655 | } | |
8f6d0378 | 1656 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1657 | |
80a3d1bb RR |
1658 | static void add_usage_links(struct module *mod) |
1659 | { | |
1660 | #ifdef CONFIG_MODULE_UNLOAD | |
1661 | struct module_use *use; | |
1662 | int nowarn; | |
1663 | ||
75676500 | 1664 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1665 | list_for_each_entry(use, &mod->target_list, target_list) { |
1666 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1667 | &mod->mkobj.kobj, mod->name); | |
1668 | } | |
75676500 | 1669 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1670 | #endif |
1671 | } | |
1672 | ||
1673 | static void del_usage_links(struct module *mod) | |
1674 | { | |
1675 | #ifdef CONFIG_MODULE_UNLOAD | |
1676 | struct module_use *use; | |
1677 | ||
75676500 | 1678 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1679 | list_for_each_entry(use, &mod->target_list, target_list) |
1680 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1681 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1682 | #endif |
1683 | } | |
1684 | ||
6407ebb2 | 1685 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1686 | { |
1687 | struct module_attribute *attr; | |
03e88ae1 | 1688 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1689 | int error = 0; |
1690 | int i; | |
1691 | ||
03e88ae1 GKH |
1692 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1693 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1694 | GFP_KERNEL); | |
1695 | if (!mod->modinfo_attrs) | |
1696 | return -ENOMEM; | |
1697 | ||
1698 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1699 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1700 | if (!attr->test || | |
03e88ae1 GKH |
1701 | (attr->test && attr->test(mod))) { |
1702 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1703 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1704 | error = sysfs_create_file(&mod->mkobj.kobj, |
1705 | &temp_attr->attr); | |
03e88ae1 GKH |
1706 | ++temp_attr; |
1707 | } | |
c988d2b2 MD |
1708 | } |
1709 | return error; | |
1710 | } | |
1711 | ||
6407ebb2 | 1712 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1713 | { |
1714 | struct module_attribute *attr; | |
1715 | int i; | |
1716 | ||
03e88ae1 GKH |
1717 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1718 | /* pick a field to test for end of list */ | |
1719 | if (!attr->attr.name) | |
1720 | break; | |
6da0b565 | 1721 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1722 | if (attr->free) |
1723 | attr->free(mod); | |
c988d2b2 | 1724 | } |
03e88ae1 | 1725 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1726 | } |
1da177e4 | 1727 | |
942e4431 LZ |
1728 | static void mod_kobject_put(struct module *mod) |
1729 | { | |
1730 | DECLARE_COMPLETION_ONSTACK(c); | |
1731 | mod->mkobj.kobj_completion = &c; | |
1732 | kobject_put(&mod->mkobj.kobj); | |
1733 | wait_for_completion(&c); | |
1734 | } | |
1735 | ||
6407ebb2 | 1736 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1737 | { |
1738 | int err; | |
6494a93d | 1739 | struct kobject *kobj; |
1da177e4 | 1740 | |
823bccfc | 1741 | if (!module_sysfs_initialized) { |
bddb12b3 | 1742 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1743 | err = -EINVAL; |
1744 | goto out; | |
1745 | } | |
6494a93d GKH |
1746 | |
1747 | kobj = kset_find_obj(module_kset, mod->name); | |
1748 | if (kobj) { | |
bddb12b3 | 1749 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1750 | kobject_put(kobj); |
1751 | err = -EINVAL; | |
1752 | goto out; | |
1753 | } | |
1754 | ||
1da177e4 | 1755 | mod->mkobj.mod = mod; |
e17e0f51 | 1756 | |
ac3c8141 GKH |
1757 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1758 | mod->mkobj.kobj.kset = module_kset; | |
1759 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1760 | "%s", mod->name); | |
1761 | if (err) | |
942e4431 | 1762 | mod_kobject_put(mod); |
270a6c4c | 1763 | |
97c146ef | 1764 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1765 | out: |
1766 | return err; | |
1767 | } | |
1768 | ||
6407ebb2 | 1769 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1770 | const struct load_info *info, |
270a6c4c KS |
1771 | struct kernel_param *kparam, |
1772 | unsigned int num_params) | |
1773 | { | |
1774 | int err; | |
1775 | ||
80a3d1bb RR |
1776 | err = mod_sysfs_init(mod); |
1777 | if (err) | |
1778 | goto out; | |
1779 | ||
4ff6abff | 1780 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1781 | if (!mod->holders_dir) { |
1782 | err = -ENOMEM; | |
270a6c4c | 1783 | goto out_unreg; |
240936e1 | 1784 | } |
270a6c4c | 1785 | |
1da177e4 LT |
1786 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1787 | if (err) | |
270a6c4c | 1788 | goto out_unreg_holders; |
1da177e4 | 1789 | |
c988d2b2 MD |
1790 | err = module_add_modinfo_attrs(mod); |
1791 | if (err) | |
e17e0f51 | 1792 | goto out_unreg_param; |
c988d2b2 | 1793 | |
80a3d1bb | 1794 | add_usage_links(mod); |
8f6d0378 RR |
1795 | add_sect_attrs(mod, info); |
1796 | add_notes_attrs(mod, info); | |
80a3d1bb | 1797 | |
e17e0f51 | 1798 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1799 | return 0; |
1800 | ||
e17e0f51 KS |
1801 | out_unreg_param: |
1802 | module_param_sysfs_remove(mod); | |
270a6c4c | 1803 | out_unreg_holders: |
78a2d906 | 1804 | kobject_put(mod->holders_dir); |
270a6c4c | 1805 | out_unreg: |
942e4431 | 1806 | mod_kobject_put(mod); |
80a3d1bb | 1807 | out: |
1da177e4 LT |
1808 | return err; |
1809 | } | |
34e4e2fe DL |
1810 | |
1811 | static void mod_sysfs_fini(struct module *mod) | |
1812 | { | |
8f6d0378 RR |
1813 | remove_notes_attrs(mod); |
1814 | remove_sect_attrs(mod); | |
942e4431 | 1815 | mod_kobject_put(mod); |
34e4e2fe DL |
1816 | } |
1817 | ||
8f6d0378 | 1818 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1819 | |
8f6d0378 RR |
1820 | static int mod_sysfs_setup(struct module *mod, |
1821 | const struct load_info *info, | |
6407ebb2 RR |
1822 | struct kernel_param *kparam, |
1823 | unsigned int num_params) | |
1824 | { | |
1825 | return 0; | |
1826 | } | |
1827 | ||
34e4e2fe DL |
1828 | static void mod_sysfs_fini(struct module *mod) |
1829 | { | |
1830 | } | |
1831 | ||
36b0360d RR |
1832 | static void module_remove_modinfo_attrs(struct module *mod) |
1833 | { | |
1834 | } | |
1835 | ||
80a3d1bb RR |
1836 | static void del_usage_links(struct module *mod) |
1837 | { | |
1838 | } | |
1839 | ||
34e4e2fe | 1840 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1841 | |
36b0360d | 1842 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1843 | { |
80a3d1bb | 1844 | del_usage_links(mod); |
c988d2b2 | 1845 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1846 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1847 | kobject_put(mod->mkobj.drivers_dir); |
1848 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1849 | mod_sysfs_fini(mod); |
1da177e4 LT |
1850 | } |
1851 | ||
84e1c6bb | 1852 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1853 | /* | |
1854 | * LKM RO/NX protection: protect module's text/ro-data | |
1855 | * from modification and any data from execution. | |
1856 | */ | |
1857 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) | |
1858 | { | |
1859 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); | |
1860 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); | |
1861 | ||
1862 | if (end_pfn > begin_pfn) | |
1863 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1864 | } | |
1865 | ||
1866 | static void set_section_ro_nx(void *base, | |
1867 | unsigned long text_size, | |
1868 | unsigned long ro_size, | |
1869 | unsigned long total_size) | |
1870 | { | |
1871 | /* begin and end PFNs of the current subsection */ | |
1872 | unsigned long begin_pfn; | |
1873 | unsigned long end_pfn; | |
1874 | ||
1875 | /* | |
1876 | * Set RO for module text and RO-data: | |
1877 | * - Always protect first page. | |
1878 | * - Do not protect last partial page. | |
1879 | */ | |
1880 | if (ro_size > 0) | |
1881 | set_page_attributes(base, base + ro_size, set_memory_ro); | |
1882 | ||
1883 | /* | |
1884 | * Set NX permissions for module data: | |
1885 | * - Do not protect first partial page. | |
1886 | * - Always protect last page. | |
1887 | */ | |
1888 | if (total_size > text_size) { | |
1889 | begin_pfn = PFN_UP((unsigned long)base + text_size); | |
1890 | end_pfn = PFN_UP((unsigned long)base + total_size); | |
1891 | if (end_pfn > begin_pfn) | |
1892 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1893 | } | |
1894 | } | |
1895 | ||
01526ed0 JG |
1896 | static void unset_module_core_ro_nx(struct module *mod) |
1897 | { | |
1898 | set_page_attributes(mod->module_core + mod->core_text_size, | |
1899 | mod->module_core + mod->core_size, | |
1900 | set_memory_x); | |
1901 | set_page_attributes(mod->module_core, | |
1902 | mod->module_core + mod->core_ro_size, | |
1903 | set_memory_rw); | |
1904 | } | |
1905 | ||
1906 | static void unset_module_init_ro_nx(struct module *mod) | |
1907 | { | |
1908 | set_page_attributes(mod->module_init + mod->init_text_size, | |
1909 | mod->module_init + mod->init_size, | |
1910 | set_memory_x); | |
1911 | set_page_attributes(mod->module_init, | |
1912 | mod->module_init + mod->init_ro_size, | |
1913 | set_memory_rw); | |
84e1c6bb | 1914 | } |
1915 | ||
1916 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1917 | void set_all_modules_text_rw(void) |
84e1c6bb | 1918 | { |
1919 | struct module *mod; | |
1920 | ||
1921 | mutex_lock(&module_mutex); | |
1922 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1923 | if (mod->state == MODULE_STATE_UNFORMED) |
1924 | continue; | |
84e1c6bb | 1925 | if ((mod->module_core) && (mod->core_text_size)) { |
1926 | set_page_attributes(mod->module_core, | |
1927 | mod->module_core + mod->core_text_size, | |
1928 | set_memory_rw); | |
1929 | } | |
1930 | if ((mod->module_init) && (mod->init_text_size)) { | |
1931 | set_page_attributes(mod->module_init, | |
1932 | mod->module_init + mod->init_text_size, | |
1933 | set_memory_rw); | |
1934 | } | |
1935 | } | |
1936 | mutex_unlock(&module_mutex); | |
1937 | } | |
1938 | ||
1939 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1940 | void set_all_modules_text_ro(void) |
84e1c6bb | 1941 | { |
1942 | struct module *mod; | |
1943 | ||
1944 | mutex_lock(&module_mutex); | |
1945 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1946 | if (mod->state == MODULE_STATE_UNFORMED) |
1947 | continue; | |
84e1c6bb | 1948 | if ((mod->module_core) && (mod->core_text_size)) { |
1949 | set_page_attributes(mod->module_core, | |
1950 | mod->module_core + mod->core_text_size, | |
1951 | set_memory_ro); | |
1952 | } | |
1953 | if ((mod->module_init) && (mod->init_text_size)) { | |
1954 | set_page_attributes(mod->module_init, | |
1955 | mod->module_init + mod->init_text_size, | |
1956 | set_memory_ro); | |
1957 | } | |
1958 | } | |
1959 | mutex_unlock(&module_mutex); | |
1960 | } | |
1961 | #else | |
1962 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } | |
01526ed0 JG |
1963 | static void unset_module_core_ro_nx(struct module *mod) { } |
1964 | static void unset_module_init_ro_nx(struct module *mod) { } | |
84e1c6bb | 1965 | #endif |
1966 | ||
be1f221c | 1967 | void __weak module_memfree(void *module_region) |
74e08fcf JB |
1968 | { |
1969 | vfree(module_region); | |
1970 | } | |
1971 | ||
1972 | void __weak module_arch_cleanup(struct module *mod) | |
1973 | { | |
1974 | } | |
1975 | ||
d453cded RR |
1976 | void __weak module_arch_freeing_init(struct module *mod) |
1977 | { | |
1978 | } | |
1979 | ||
75676500 | 1980 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1981 | static void free_module(struct module *mod) |
1982 | { | |
7ead8b83 LZ |
1983 | trace_module_free(mod); |
1984 | ||
36b0360d | 1985 | mod_sysfs_teardown(mod); |
1da177e4 | 1986 | |
944a1fa0 RR |
1987 | /* We leave it in list to prevent duplicate loads, but make sure |
1988 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 1989 | mutex_lock(&module_mutex); |
944a1fa0 | 1990 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 1991 | mutex_unlock(&module_mutex); |
944a1fa0 | 1992 | |
b82bab4b JB |
1993 | /* Remove dynamic debug info */ |
1994 | ddebug_remove_module(mod->name); | |
1995 | ||
1da177e4 LT |
1996 | /* Arch-specific cleanup. */ |
1997 | module_arch_cleanup(mod); | |
1998 | ||
1999 | /* Module unload stuff */ | |
2000 | module_unload_free(mod); | |
2001 | ||
e180a6b7 RR |
2002 | /* Free any allocated parameters. */ |
2003 | destroy_params(mod->kp, mod->num_kp); | |
2004 | ||
944a1fa0 RR |
2005 | /* Now we can delete it from the lists */ |
2006 | mutex_lock(&module_mutex); | |
461e34ae MH |
2007 | /* Unlink carefully: kallsyms could be walking list. */ |
2008 | list_del_rcu(&mod->list); | |
93c2e105 | 2009 | mod_tree_remove(mod); |
0286b5ea | 2010 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2011 | module_bug_cleanup(mod); |
0be964be PZ |
2012 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
2013 | synchronize_sched(); | |
944a1fa0 RR |
2014 | mutex_unlock(&module_mutex); |
2015 | ||
1da177e4 | 2016 | /* This may be NULL, but that's OK */ |
01526ed0 | 2017 | unset_module_init_ro_nx(mod); |
d453cded | 2018 | module_arch_freeing_init(mod); |
be1f221c | 2019 | module_memfree(mod->module_init); |
1da177e4 | 2020 | kfree(mod->args); |
259354de | 2021 | percpu_modfree(mod); |
9f85a4bb | 2022 | |
35a9393c | 2023 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
fbb9ce95 IM |
2024 | lockdep_free_key_range(mod->module_core, mod->core_size); |
2025 | ||
1da177e4 | 2026 | /* Finally, free the core (containing the module structure) */ |
01526ed0 | 2027 | unset_module_core_ro_nx(mod); |
be1f221c | 2028 | module_memfree(mod->module_core); |
eb8cdec4 BS |
2029 | |
2030 | #ifdef CONFIG_MPU | |
2031 | update_protections(current->mm); | |
2032 | #endif | |
1da177e4 LT |
2033 | } |
2034 | ||
2035 | void *__symbol_get(const char *symbol) | |
2036 | { | |
2037 | struct module *owner; | |
414fd31b | 2038 | const struct kernel_symbol *sym; |
1da177e4 | 2039 | |
24da1cbf | 2040 | preempt_disable(); |
414fd31b TA |
2041 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2042 | if (sym && strong_try_module_get(owner)) | |
2043 | sym = NULL; | |
24da1cbf | 2044 | preempt_enable(); |
1da177e4 | 2045 | |
414fd31b | 2046 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
2047 | } |
2048 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2049 | ||
eea8b54d AN |
2050 | /* |
2051 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2052 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2053 | * |
2054 | * You must hold the module_mutex. | |
eea8b54d AN |
2055 | */ |
2056 | static int verify_export_symbols(struct module *mod) | |
2057 | { | |
b211104d | 2058 | unsigned int i; |
eea8b54d | 2059 | struct module *owner; |
b211104d RR |
2060 | const struct kernel_symbol *s; |
2061 | struct { | |
2062 | const struct kernel_symbol *sym; | |
2063 | unsigned int num; | |
2064 | } arr[] = { | |
2065 | { mod->syms, mod->num_syms }, | |
2066 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2067 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2068 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2069 | { mod->unused_syms, mod->num_unused_syms }, |
2070 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2071 | #endif |
b211104d | 2072 | }; |
eea8b54d | 2073 | |
b211104d RR |
2074 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2075 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 2076 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 2077 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
2078 | " (owned by %s)\n", |
2079 | mod->name, s->name, module_name(owner)); | |
2080 | return -ENOEXEC; | |
2081 | } | |
eea8b54d | 2082 | } |
b211104d RR |
2083 | } |
2084 | return 0; | |
eea8b54d AN |
2085 | } |
2086 | ||
9a4b9708 | 2087 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2088 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2089 | { | |
2090 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2091 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2092 | unsigned long secbase; |
49668688 | 2093 | unsigned int i; |
1da177e4 | 2094 | int ret = 0; |
414fd31b | 2095 | const struct kernel_symbol *ksym; |
1da177e4 | 2096 | |
49668688 RR |
2097 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2098 | const char *name = info->strtab + sym[i].st_name; | |
2099 | ||
1da177e4 LT |
2100 | switch (sym[i].st_shndx) { |
2101 | case SHN_COMMON: | |
80375980 JM |
2102 | /* Ignore common symbols */ |
2103 | if (!strncmp(name, "__gnu_lto", 9)) | |
2104 | break; | |
2105 | ||
1da177e4 LT |
2106 | /* We compiled with -fno-common. These are not |
2107 | supposed to happen. */ | |
5e124169 | 2108 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2109 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2110 | mod->name); |
2111 | ret = -ENOEXEC; | |
2112 | break; | |
2113 | ||
2114 | case SHN_ABS: | |
2115 | /* Don't need to do anything */ | |
5e124169 | 2116 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2117 | (long)sym[i].st_value); |
2118 | break; | |
2119 | ||
2120 | case SHN_UNDEF: | |
49668688 | 2121 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2122 | /* Ok if resolved. */ |
9bea7f23 | 2123 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 2124 | sym[i].st_value = ksym->value; |
1da177e4 | 2125 | break; |
414fd31b TA |
2126 | } |
2127 | ||
1da177e4 | 2128 | /* Ok if weak. */ |
9bea7f23 | 2129 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2130 | break; |
2131 | ||
bddb12b3 AM |
2132 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
2133 | mod->name, name, PTR_ERR(ksym)); | |
9bea7f23 | 2134 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
2135 | break; |
2136 | ||
2137 | default: | |
2138 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2139 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2140 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2141 | else |
49668688 | 2142 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2143 | sym[i].st_value += secbase; |
2144 | break; | |
2145 | } | |
2146 | } | |
2147 | ||
2148 | return ret; | |
2149 | } | |
2150 | ||
49668688 | 2151 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2152 | { |
2153 | unsigned int i; | |
2154 | int err = 0; | |
2155 | ||
2156 | /* Now do relocations. */ | |
49668688 RR |
2157 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2158 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2159 | |
2160 | /* Not a valid relocation section? */ | |
49668688 | 2161 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2162 | continue; |
2163 | ||
2164 | /* Don't bother with non-allocated sections */ | |
49668688 | 2165 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2166 | continue; |
2167 | ||
49668688 RR |
2168 | if (info->sechdrs[i].sh_type == SHT_REL) |
2169 | err = apply_relocate(info->sechdrs, info->strtab, | |
2170 | info->index.sym, i, mod); | |
2171 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2172 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2173 | info->index.sym, i, mod); | |
22e268eb RR |
2174 | if (err < 0) |
2175 | break; | |
2176 | } | |
2177 | return err; | |
2178 | } | |
2179 | ||
088af9a6 HD |
2180 | /* Additional bytes needed by arch in front of individual sections */ |
2181 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2182 | unsigned int section) | |
2183 | { | |
2184 | /* default implementation just returns zero */ | |
2185 | return 0; | |
2186 | } | |
2187 | ||
1da177e4 | 2188 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2189 | static long get_offset(struct module *mod, unsigned int *size, |
2190 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2191 | { |
2192 | long ret; | |
2193 | ||
088af9a6 | 2194 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2195 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2196 | *size = ret + sechdr->sh_size; | |
2197 | return ret; | |
2198 | } | |
2199 | ||
2200 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2201 | might -- code, read-only data, read-write data, small data. Tally | |
2202 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2203 | belongs in init. */ | |
49668688 | 2204 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2205 | { |
2206 | static unsigned long const masks[][2] = { | |
2207 | /* NOTE: all executable code must be the first section | |
2208 | * in this array; otherwise modify the text_size | |
2209 | * finder in the two loops below */ | |
2210 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2211 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
2212 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2213 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2214 | }; | |
2215 | unsigned int m, i; | |
2216 | ||
49668688 RR |
2217 | for (i = 0; i < info->hdr->e_shnum; i++) |
2218 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2219 | |
5e124169 | 2220 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2221 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2222 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2223 | Elf_Shdr *s = &info->sechdrs[i]; | |
2224 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2225 | |
2226 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2227 | || (s->sh_flags & masks[m][1]) | |
2228 | || s->sh_entsize != ~0UL | |
49668688 | 2229 | || strstarts(sname, ".init")) |
1da177e4 | 2230 | continue; |
088af9a6 | 2231 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
5e124169 | 2232 | pr_debug("\t%s\n", sname); |
1da177e4 | 2233 | } |
84e1c6bb | 2234 | switch (m) { |
2235 | case 0: /* executable */ | |
2236 | mod->core_size = debug_align(mod->core_size); | |
1da177e4 | 2237 | mod->core_text_size = mod->core_size; |
84e1c6bb | 2238 | break; |
2239 | case 1: /* RO: text and ro-data */ | |
2240 | mod->core_size = debug_align(mod->core_size); | |
2241 | mod->core_ro_size = mod->core_size; | |
2242 | break; | |
2243 | case 3: /* whole core */ | |
2244 | mod->core_size = debug_align(mod->core_size); | |
2245 | break; | |
2246 | } | |
1da177e4 LT |
2247 | } |
2248 | ||
5e124169 | 2249 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2250 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2251 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2252 | Elf_Shdr *s = &info->sechdrs[i]; | |
2253 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2254 | |
2255 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2256 | || (s->sh_flags & masks[m][1]) | |
2257 | || s->sh_entsize != ~0UL | |
49668688 | 2258 | || !strstarts(sname, ".init")) |
1da177e4 | 2259 | continue; |
088af9a6 | 2260 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 | 2261 | | INIT_OFFSET_MASK); |
5e124169 | 2262 | pr_debug("\t%s\n", sname); |
1da177e4 | 2263 | } |
84e1c6bb | 2264 | switch (m) { |
2265 | case 0: /* executable */ | |
2266 | mod->init_size = debug_align(mod->init_size); | |
1da177e4 | 2267 | mod->init_text_size = mod->init_size; |
84e1c6bb | 2268 | break; |
2269 | case 1: /* RO: text and ro-data */ | |
2270 | mod->init_size = debug_align(mod->init_size); | |
2271 | mod->init_ro_size = mod->init_size; | |
2272 | break; | |
2273 | case 3: /* whole init */ | |
2274 | mod->init_size = debug_align(mod->init_size); | |
2275 | break; | |
2276 | } | |
1da177e4 LT |
2277 | } |
2278 | } | |
2279 | ||
1da177e4 LT |
2280 | static void set_license(struct module *mod, const char *license) |
2281 | { | |
2282 | if (!license) | |
2283 | license = "unspecified"; | |
2284 | ||
fa3ba2e8 | 2285 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2286 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2287 | pr_warn("%s: module license '%s' taints kernel.\n", |
2288 | mod->name, license); | |
373d4d09 RR |
2289 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2290 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2291 | } |
2292 | } | |
2293 | ||
2294 | /* Parse tag=value strings from .modinfo section */ | |
2295 | static char *next_string(char *string, unsigned long *secsize) | |
2296 | { | |
2297 | /* Skip non-zero chars */ | |
2298 | while (string[0]) { | |
2299 | string++; | |
2300 | if ((*secsize)-- <= 1) | |
2301 | return NULL; | |
2302 | } | |
2303 | ||
2304 | /* Skip any zero padding. */ | |
2305 | while (!string[0]) { | |
2306 | string++; | |
2307 | if ((*secsize)-- <= 1) | |
2308 | return NULL; | |
2309 | } | |
2310 | return string; | |
2311 | } | |
2312 | ||
49668688 | 2313 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2314 | { |
2315 | char *p; | |
2316 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2317 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2318 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2319 | |
49668688 | 2320 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2321 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2322 | return p + taglen + 1; | |
2323 | } | |
2324 | return NULL; | |
2325 | } | |
2326 | ||
49668688 | 2327 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2328 | { |
2329 | struct module_attribute *attr; | |
2330 | int i; | |
2331 | ||
2332 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2333 | if (attr->setup) | |
49668688 | 2334 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2335 | } |
2336 | } | |
c988d2b2 | 2337 | |
a263f776 RR |
2338 | static void free_modinfo(struct module *mod) |
2339 | { | |
2340 | struct module_attribute *attr; | |
2341 | int i; | |
2342 | ||
2343 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2344 | if (attr->free) | |
2345 | attr->free(mod); | |
2346 | } | |
2347 | } | |
2348 | ||
1da177e4 | 2349 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2350 | |
2351 | /* lookup symbol in given range of kernel_symbols */ | |
2352 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2353 | const struct kernel_symbol *start, | |
2354 | const struct kernel_symbol *stop) | |
2355 | { | |
9d63487f AIB |
2356 | return bsearch(name, start, stop - start, |
2357 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2358 | } |
2359 | ||
ca4787b7 TA |
2360 | static int is_exported(const char *name, unsigned long value, |
2361 | const struct module *mod) | |
1da177e4 | 2362 | { |
ca4787b7 TA |
2363 | const struct kernel_symbol *ks; |
2364 | if (!mod) | |
2365 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2366 | else |
ca4787b7 TA |
2367 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2368 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2369 | } |
2370 | ||
2371 | /* As per nm */ | |
eded41c1 | 2372 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2373 | { |
eded41c1 RR |
2374 | const Elf_Shdr *sechdrs = info->sechdrs; |
2375 | ||
1da177e4 LT |
2376 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2377 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2378 | return 'v'; | |
2379 | else | |
2380 | return 'w'; | |
2381 | } | |
2382 | if (sym->st_shndx == SHN_UNDEF) | |
2383 | return 'U'; | |
2384 | if (sym->st_shndx == SHN_ABS) | |
2385 | return 'a'; | |
2386 | if (sym->st_shndx >= SHN_LORESERVE) | |
2387 | return '?'; | |
2388 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2389 | return 't'; | |
2390 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2391 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2392 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2393 | return 'r'; | |
2394 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2395 | return 'g'; | |
2396 | else | |
2397 | return 'd'; | |
2398 | } | |
2399 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2400 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2401 | return 's'; | |
2402 | else | |
2403 | return 'b'; | |
2404 | } | |
eded41c1 RR |
2405 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2406 | ".debug")) { | |
1da177e4 | 2407 | return 'n'; |
eded41c1 | 2408 | } |
1da177e4 LT |
2409 | return '?'; |
2410 | } | |
2411 | ||
4a496226 | 2412 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
6da0b565 | 2413 | unsigned int shnum) |
4a496226 JB |
2414 | { |
2415 | const Elf_Shdr *sec; | |
2416 | ||
2417 | if (src->st_shndx == SHN_UNDEF | |
2418 | || src->st_shndx >= shnum | |
2419 | || !src->st_name) | |
2420 | return false; | |
2421 | ||
2422 | sec = sechdrs + src->st_shndx; | |
2423 | if (!(sec->sh_flags & SHF_ALLOC) | |
2424 | #ifndef CONFIG_KALLSYMS_ALL | |
2425 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2426 | #endif | |
2427 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2428 | return false; | |
2429 | ||
2430 | return true; | |
2431 | } | |
2432 | ||
48fd1188 KC |
2433 | /* |
2434 | * We only allocate and copy the strings needed by the parts of symtab | |
2435 | * we keep. This is simple, but has the effect of making multiple | |
2436 | * copies of duplicates. We could be more sophisticated, see | |
2437 | * linux-kernel thread starting with | |
2438 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2439 | */ | |
49668688 | 2440 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2441 | { |
49668688 RR |
2442 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2443 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2444 | const Elf_Sym *src; |
54523ec7 | 2445 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2446 | |
2447 | /* Put symbol section at end of init part of module. */ | |
2448 | symsect->sh_flags |= SHF_ALLOC; | |
2449 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
49668688 | 2450 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2451 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2452 | |
49668688 | 2453 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2454 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2455 | |
48fd1188 | 2456 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 RR |
2457 | for (ndst = i = 0; i < nsrc; i++) { |
2458 | if (i == 0 || | |
2459 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2460 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; | |
48fd1188 | 2461 | ndst++; |
554bdfe5 | 2462 | } |
59ef28b1 | 2463 | } |
4a496226 JB |
2464 | |
2465 | /* Append room for core symbols at end of core part. */ | |
49668688 | 2466 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
48fd1188 KC |
2467 | info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
2468 | mod->core_size += strtab_size; | |
168e47f2 | 2469 | mod->core_size = debug_align(mod->core_size); |
4a496226 | 2470 | |
554bdfe5 JB |
2471 | /* Put string table section at end of init part of module. */ |
2472 | strsect->sh_flags |= SHF_ALLOC; | |
2473 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
49668688 | 2474 | info->index.str) | INIT_OFFSET_MASK; |
168e47f2 | 2475 | mod->init_size = debug_align(mod->init_size); |
5e124169 | 2476 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
4a496226 JB |
2477 | } |
2478 | ||
811d66a0 | 2479 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2480 | { |
4a496226 JB |
2481 | unsigned int i, ndst; |
2482 | const Elf_Sym *src; | |
2483 | Elf_Sym *dst; | |
554bdfe5 | 2484 | char *s; |
eded41c1 | 2485 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2486 | |
eded41c1 RR |
2487 | mod->symtab = (void *)symsec->sh_addr; |
2488 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae RR |
2489 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2490 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2491 | |
2492 | /* Set types up while we still have access to sections. */ | |
2493 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2494 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2495 | |
d913188c | 2496 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
48fd1188 | 2497 | mod->core_strtab = s = mod->module_core + info->stroffs; |
4a496226 | 2498 | src = mod->symtab; |
59ef28b1 RR |
2499 | for (ndst = i = 0; i < mod->num_symtab; i++) { |
2500 | if (i == 0 || | |
2501 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2502 | dst[ndst] = src[i]; | |
2503 | dst[ndst++].st_name = s - mod->core_strtab; | |
2504 | s += strlcpy(s, &mod->strtab[src[i].st_name], | |
2505 | KSYM_NAME_LEN) + 1; | |
2506 | } | |
4a496226 JB |
2507 | } |
2508 | mod->core_num_syms = ndst; | |
1da177e4 LT |
2509 | } |
2510 | #else | |
49668688 | 2511 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2512 | { |
2513 | } | |
3ae91c21 | 2514 | |
abbce906 | 2515 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2516 | { |
2517 | } | |
2518 | #endif /* CONFIG_KALLSYMS */ | |
2519 | ||
e9d376f0 | 2520 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2521 | { |
811d66a0 RR |
2522 | if (!debug) |
2523 | return; | |
e9d376f0 JB |
2524 | #ifdef CONFIG_DYNAMIC_DEBUG |
2525 | if (ddebug_add_module(debug, num, debug->modname)) | |
bddb12b3 AM |
2526 | pr_err("dynamic debug error adding module: %s\n", |
2527 | debug->modname); | |
e9d376f0 | 2528 | #endif |
5e458cc0 | 2529 | } |
346e15be | 2530 | |
ff49d74a YS |
2531 | static void dynamic_debug_remove(struct _ddebug *debug) |
2532 | { | |
2533 | if (debug) | |
2534 | ddebug_remove_module(debug->modname); | |
2535 | } | |
2536 | ||
74e08fcf JB |
2537 | void * __weak module_alloc(unsigned long size) |
2538 | { | |
82fab442 | 2539 | return vmalloc_exec(size); |
74e08fcf JB |
2540 | } |
2541 | ||
3a642e99 RR |
2542 | static void *module_alloc_update_bounds(unsigned long size) |
2543 | { | |
2544 | void *ret = module_alloc(size); | |
2545 | ||
2546 | if (ret) { | |
75676500 | 2547 | mutex_lock(&module_mutex); |
3a642e99 RR |
2548 | /* Update module bounds. */ |
2549 | if ((unsigned long)ret < module_addr_min) | |
2550 | module_addr_min = (unsigned long)ret; | |
2551 | if ((unsigned long)ret + size > module_addr_max) | |
2552 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2553 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2554 | } |
2555 | return ret; | |
2556 | } | |
2557 | ||
4f2294b6 | 2558 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2559 | static void kmemleak_load_module(const struct module *mod, |
2560 | const struct load_info *info) | |
4f2294b6 CM |
2561 | { |
2562 | unsigned int i; | |
2563 | ||
2564 | /* only scan the sections containing data */ | |
c017b4be | 2565 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2566 | |
49668688 | 2567 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2568 | /* Scan all writable sections that's not executable */ |
2569 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2570 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2571 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2572 | continue; |
2573 | ||
49668688 RR |
2574 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2575 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2576 | } |
2577 | } | |
2578 | #else | |
49668688 RR |
2579 | static inline void kmemleak_load_module(const struct module *mod, |
2580 | const struct load_info *info) | |
4f2294b6 CM |
2581 | { |
2582 | } | |
2583 | #endif | |
2584 | ||
106a4ee2 | 2585 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2586 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2587 | { |
2588 | int err = -ENOKEY; | |
34e1169d KC |
2589 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2590 | const void *mod = info->hdr; | |
caabe240 | 2591 | |
34e1169d KC |
2592 | if (info->len > markerlen && |
2593 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { | |
caabe240 | 2594 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2595 | info->len -= markerlen; |
2596 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2597 | } |
2598 | ||
2599 | if (!err) { | |
2600 | info->sig_ok = true; | |
2601 | return 0; | |
2602 | } | |
2603 | ||
2604 | /* Not having a signature is only an error if we're strict. */ | |
2605 | if (err == -ENOKEY && !sig_enforce) | |
2606 | err = 0; | |
2607 | ||
2608 | return err; | |
2609 | } | |
2610 | #else /* !CONFIG_MODULE_SIG */ | |
34e1169d | 2611 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2612 | { |
2613 | return 0; | |
2614 | } | |
2615 | #endif /* !CONFIG_MODULE_SIG */ | |
2616 | ||
34e1169d KC |
2617 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2618 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2619 | { |
34e1169d KC |
2620 | if (info->len < sizeof(*(info->hdr))) |
2621 | return -ENOEXEC; | |
2622 | ||
2623 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2624 | || info->hdr->e_type != ET_REL | |
2625 | || !elf_check_arch(info->hdr) | |
2626 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2627 | return -ENOEXEC; | |
2628 | ||
2629 | if (info->hdr->e_shoff >= info->len | |
2630 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2631 | info->len - info->hdr->e_shoff)) | |
2632 | return -ENOEXEC; | |
40dd2560 | 2633 | |
34e1169d KC |
2634 | return 0; |
2635 | } | |
2636 | ||
3afe9f84 LT |
2637 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2638 | ||
2639 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2640 | { | |
2641 | do { | |
2642 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2643 | ||
2644 | if (copy_from_user(dst, usrc, n) != 0) | |
2645 | return -EFAULT; | |
2646 | cond_resched(); | |
2647 | dst += n; | |
2648 | usrc += n; | |
2649 | len -= n; | |
2650 | } while (len); | |
2651 | return 0; | |
2652 | } | |
2653 | ||
34e1169d KC |
2654 | /* Sets info->hdr and info->len. */ |
2655 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2656 | struct load_info *info) | |
40dd2560 RR |
2657 | { |
2658 | int err; | |
40dd2560 | 2659 | |
34e1169d KC |
2660 | info->len = len; |
2661 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2662 | return -ENOEXEC; |
2663 | ||
2e72d51b KC |
2664 | err = security_kernel_module_from_file(NULL); |
2665 | if (err) | |
2666 | return err; | |
2667 | ||
40dd2560 | 2668 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d KS |
2669 | info->hdr = __vmalloc(info->len, |
2670 | GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN, PAGE_KERNEL); | |
34e1169d | 2671 | if (!info->hdr) |
40dd2560 RR |
2672 | return -ENOMEM; |
2673 | ||
3afe9f84 | 2674 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2675 | vfree(info->hdr); |
2676 | return -EFAULT; | |
40dd2560 RR |
2677 | } |
2678 | ||
34e1169d KC |
2679 | return 0; |
2680 | } | |
2681 | ||
2682 | /* Sets info->hdr and info->len. */ | |
2683 | static int copy_module_from_fd(int fd, struct load_info *info) | |
2684 | { | |
a2e0578b | 2685 | struct fd f = fdget(fd); |
34e1169d KC |
2686 | int err; |
2687 | struct kstat stat; | |
2688 | loff_t pos; | |
2689 | ssize_t bytes = 0; | |
2690 | ||
a2e0578b | 2691 | if (!f.file) |
34e1169d KC |
2692 | return -ENOEXEC; |
2693 | ||
a2e0578b | 2694 | err = security_kernel_module_from_file(f.file); |
106a4ee2 | 2695 | if (err) |
2e72d51b | 2696 | goto out; |
106a4ee2 | 2697 | |
a2e0578b | 2698 | err = vfs_getattr(&f.file->f_path, &stat); |
106a4ee2 | 2699 | if (err) |
34e1169d | 2700 | goto out; |
40dd2560 | 2701 | |
34e1169d KC |
2702 | if (stat.size > INT_MAX) { |
2703 | err = -EFBIG; | |
2704 | goto out; | |
40dd2560 | 2705 | } |
52441fa8 SL |
2706 | |
2707 | /* Don't hand 0 to vmalloc, it whines. */ | |
2708 | if (stat.size == 0) { | |
2709 | err = -EINVAL; | |
2710 | goto out; | |
2711 | } | |
2712 | ||
34e1169d KC |
2713 | info->hdr = vmalloc(stat.size); |
2714 | if (!info->hdr) { | |
2715 | err = -ENOMEM; | |
2716 | goto out; | |
40dd2560 | 2717 | } |
d913188c | 2718 | |
34e1169d KC |
2719 | pos = 0; |
2720 | while (pos < stat.size) { | |
a2e0578b | 2721 | bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos, |
34e1169d KC |
2722 | stat.size - pos); |
2723 | if (bytes < 0) { | |
2724 | vfree(info->hdr); | |
2725 | err = bytes; | |
2726 | goto out; | |
2727 | } | |
2728 | if (bytes == 0) | |
2729 | break; | |
2730 | pos += bytes; | |
2731 | } | |
2732 | info->len = pos; | |
40dd2560 | 2733 | |
34e1169d | 2734 | out: |
a2e0578b | 2735 | fdput(f); |
40dd2560 RR |
2736 | return err; |
2737 | } | |
2738 | ||
d913188c RR |
2739 | static void free_copy(struct load_info *info) |
2740 | { | |
d913188c RR |
2741 | vfree(info->hdr); |
2742 | } | |
2743 | ||
2f3238ae | 2744 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2745 | { |
2746 | unsigned int i; | |
2747 | ||
2748 | /* This should always be true, but let's be sure. */ | |
2749 | info->sechdrs[0].sh_addr = 0; | |
2750 | ||
2751 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2752 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2753 | if (shdr->sh_type != SHT_NOBITS | |
2754 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2755 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2756 | return -ENOEXEC; |
2757 | } | |
2758 | ||
2759 | /* Mark all sections sh_addr with their address in the | |
2760 | temporary image. */ | |
2761 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2762 | ||
2763 | #ifndef CONFIG_MODULE_UNLOAD | |
2764 | /* Don't load .exit sections */ | |
2765 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2766 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2767 | #endif | |
8b5f61a7 | 2768 | } |
d6df72a0 RR |
2769 | |
2770 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2771 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2772 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2773 | else | |
2774 | info->index.vers = find_sec(info, "__versions"); | |
49668688 | 2775 | info->index.info = find_sec(info, ".modinfo"); |
d6df72a0 RR |
2776 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2777 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2778 | return 0; |
2779 | } | |
2780 | ||
3264d3f9 LT |
2781 | /* |
2782 | * Set up our basic convenience variables (pointers to section headers, | |
2783 | * search for module section index etc), and do some basic section | |
2784 | * verification. | |
2785 | * | |
2786 | * Return the temporary module pointer (we'll replace it with the final | |
2787 | * one when we move the module sections around). | |
2788 | */ | |
2f3238ae | 2789 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2790 | { |
2791 | unsigned int i; | |
8b5f61a7 | 2792 | int err; |
3264d3f9 LT |
2793 | struct module *mod; |
2794 | ||
2795 | /* Set up the convenience variables */ | |
2796 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2797 | info->secstrings = (void *)info->hdr |
2798 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2799 | |
2f3238ae | 2800 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2801 | if (err) |
2802 | return ERR_PTR(err); | |
3264d3f9 | 2803 | |
8b5f61a7 RR |
2804 | /* Find internal symbols and strings. */ |
2805 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2806 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2807 | info->index.sym = i; | |
2808 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2809 | info->strtab = (char *)info->hdr |
2810 | + info->sechdrs[info->index.str].sh_offset; | |
2811 | break; | |
3264d3f9 | 2812 | } |
3264d3f9 LT |
2813 | } |
2814 | ||
49668688 | 2815 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2816 | if (!info->index.mod) { |
bddb12b3 | 2817 | pr_warn("No module found in object\n"); |
3264d3f9 LT |
2818 | return ERR_PTR(-ENOEXEC); |
2819 | } | |
2820 | /* This is temporary: point mod into copy of data. */ | |
2821 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2822 | ||
2823 | if (info->index.sym == 0) { | |
bddb12b3 | 2824 | pr_warn("%s: module has no symbols (stripped?)\n", mod->name); |
3264d3f9 LT |
2825 | return ERR_PTR(-ENOEXEC); |
2826 | } | |
2827 | ||
49668688 | 2828 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2829 | |
3264d3f9 LT |
2830 | /* Check module struct version now, before we try to use module. */ |
2831 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2832 | return ERR_PTR(-ENOEXEC); | |
2833 | ||
2834 | return mod; | |
3264d3f9 LT |
2835 | } |
2836 | ||
2f3238ae | 2837 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2838 | { |
49668688 | 2839 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2840 | int err; |
2841 | ||
2f3238ae RR |
2842 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2843 | modmagic = NULL; | |
2844 | ||
40dd2560 RR |
2845 | /* This is allowed: modprobe --force will invalidate it. */ |
2846 | if (!modmagic) { | |
2847 | err = try_to_force_load(mod, "bad vermagic"); | |
2848 | if (err) | |
2849 | return err; | |
49668688 | 2850 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 2851 | pr_err("%s: version magic '%s' should be '%s'\n", |
40dd2560 RR |
2852 | mod->name, modmagic, vermagic); |
2853 | return -ENOEXEC; | |
2854 | } | |
2855 | ||
2449b8ba | 2856 | if (!get_modinfo(info, "intree")) |
373d4d09 | 2857 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
2449b8ba | 2858 | |
49668688 | 2859 | if (get_modinfo(info, "staging")) { |
373d4d09 | 2860 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
2861 | pr_warn("%s: module is from the staging directory, the quality " |
2862 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 2863 | } |
22e268eb RR |
2864 | |
2865 | /* Set up license info based on the info section */ | |
49668688 | 2866 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2867 | |
40dd2560 RR |
2868 | return 0; |
2869 | } | |
2870 | ||
eb3057df | 2871 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2872 | { |
49668688 | 2873 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2874 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2875 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2876 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2877 | mod->crcs = section_addr(info, "__kcrctab"); |
2878 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2879 | sizeof(*mod->gpl_syms), |
2880 | &mod->num_gpl_syms); | |
49668688 RR |
2881 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2882 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2883 | "__ksymtab_gpl_future", |
2884 | sizeof(*mod->gpl_future_syms), | |
2885 | &mod->num_gpl_future_syms); | |
49668688 | 2886 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2887 | |
2888 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2889 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2890 | sizeof(*mod->unused_syms), |
2891 | &mod->num_unused_syms); | |
49668688 RR |
2892 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2893 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2894 | sizeof(*mod->unused_gpl_syms), |
2895 | &mod->num_unused_gpl_syms); | |
49668688 | 2896 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2897 | #endif |
2898 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2899 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 2900 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
2901 | if (!mod->ctors) |
2902 | mod->ctors = section_objs(info, ".init_array", | |
2903 | sizeof(*mod->ctors), &mod->num_ctors); | |
2904 | else if (find_sec(info, ".init_array")) { | |
2905 | /* | |
2906 | * This shouldn't happen with same compiler and binutils | |
2907 | * building all parts of the module. | |
2908 | */ | |
6da0b565 | 2909 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
2910 | mod->name); |
2911 | return -EINVAL; | |
2912 | } | |
f91a13bb LT |
2913 | #endif |
2914 | ||
2915 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2916 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2917 | sizeof(*mod->tracepoints_ptrs), | |
2918 | &mod->num_tracepoints); | |
f91a13bb | 2919 | #endif |
bf5438fc JB |
2920 | #ifdef HAVE_JUMP_LABEL |
2921 | mod->jump_entries = section_objs(info, "__jump_table", | |
2922 | sizeof(*mod->jump_entries), | |
2923 | &mod->num_jump_entries); | |
2924 | #endif | |
f91a13bb | 2925 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2926 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2927 | sizeof(*mod->trace_events), |
2928 | &mod->num_trace_events); | |
3673b8e4 SRRH |
2929 | mod->trace_enums = section_objs(info, "_ftrace_enum_map", |
2930 | sizeof(*mod->trace_enums), | |
2931 | &mod->num_trace_enums); | |
f91a13bb | 2932 | #endif |
13b9b6e7 SR |
2933 | #ifdef CONFIG_TRACING |
2934 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2935 | sizeof(*mod->trace_bprintk_fmt_start), | |
2936 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 2937 | #endif |
f91a13bb LT |
2938 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2939 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2940 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2941 | sizeof(*mod->ftrace_callsites), |
2942 | &mod->num_ftrace_callsites); | |
2943 | #endif | |
22e268eb | 2944 | |
811d66a0 RR |
2945 | mod->extable = section_objs(info, "__ex_table", |
2946 | sizeof(*mod->extable), &mod->num_exentries); | |
2947 | ||
49668688 | 2948 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 2949 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
2950 | |
2951 | info->debug = section_objs(info, "__verbose", | |
2952 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
2953 | |
2954 | return 0; | |
f91a13bb LT |
2955 | } |
2956 | ||
49668688 | 2957 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2958 | { |
2959 | int i; | |
2960 | void *ptr; | |
2961 | ||
2962 | /* Do the allocs. */ | |
2963 | ptr = module_alloc_update_bounds(mod->core_size); | |
2964 | /* | |
2965 | * The pointer to this block is stored in the module structure | |
2966 | * which is inside the block. Just mark it as not being a | |
2967 | * leak. | |
2968 | */ | |
2969 | kmemleak_not_leak(ptr); | |
2970 | if (!ptr) | |
d913188c | 2971 | return -ENOMEM; |
65b8a9b4 LT |
2972 | |
2973 | memset(ptr, 0, mod->core_size); | |
2974 | mod->module_core = ptr; | |
2975 | ||
82fab442 RR |
2976 | if (mod->init_size) { |
2977 | ptr = module_alloc_update_bounds(mod->init_size); | |
2978 | /* | |
2979 | * The pointer to this block is stored in the module structure | |
2980 | * which is inside the block. This block doesn't need to be | |
2981 | * scanned as it contains data and code that will be freed | |
2982 | * after the module is initialized. | |
2983 | */ | |
2984 | kmemleak_ignore(ptr); | |
2985 | if (!ptr) { | |
be1f221c | 2986 | module_memfree(mod->module_core); |
82fab442 RR |
2987 | return -ENOMEM; |
2988 | } | |
2989 | memset(ptr, 0, mod->init_size); | |
2990 | mod->module_init = ptr; | |
2991 | } else | |
2992 | mod->module_init = NULL; | |
65b8a9b4 LT |
2993 | |
2994 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 2995 | pr_debug("final section addresses:\n"); |
49668688 | 2996 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2997 | void *dest; |
49668688 | 2998 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2999 | |
49668688 | 3000 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3001 | continue; |
3002 | ||
49668688 | 3003 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
65b8a9b4 | 3004 | dest = mod->module_init |
49668688 | 3005 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3006 | else |
49668688 | 3007 | dest = mod->module_core + shdr->sh_entsize; |
65b8a9b4 | 3008 | |
49668688 RR |
3009 | if (shdr->sh_type != SHT_NOBITS) |
3010 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3011 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3012 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3013 | pr_debug("\t0x%lx %s\n", |
3014 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3015 | } |
d913188c RR |
3016 | |
3017 | return 0; | |
65b8a9b4 LT |
3018 | } |
3019 | ||
49668688 | 3020 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
3021 | { |
3022 | /* | |
3023 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3024 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3025 | * using GPL-only symbols it needs. | |
3026 | */ | |
3027 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3028 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3029 | |
3030 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3031 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3032 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3033 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3034 | |
c99af375 MG |
3035 | /* lve claims to be GPL but upstream won't provide source */ |
3036 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3037 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3038 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3039 | |
22e268eb RR |
3040 | #ifdef CONFIG_MODVERSIONS |
3041 | if ((mod->num_syms && !mod->crcs) | |
3042 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3043 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3044 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3045 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3046 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3047 | #endif | |
3048 | ) { | |
3049 | return try_to_force_load(mod, | |
3050 | "no versions for exported symbols"); | |
3051 | } | |
3052 | #endif | |
3053 | return 0; | |
3054 | } | |
3055 | ||
3056 | static void flush_module_icache(const struct module *mod) | |
3057 | { | |
3058 | mm_segment_t old_fs; | |
3059 | ||
3060 | /* flush the icache in correct context */ | |
3061 | old_fs = get_fs(); | |
3062 | set_fs(KERNEL_DS); | |
3063 | ||
3064 | /* | |
3065 | * Flush the instruction cache, since we've played with text. | |
3066 | * Do it before processing of module parameters, so the module | |
3067 | * can provide parameter accessor functions of its own. | |
3068 | */ | |
3069 | if (mod->module_init) | |
3070 | flush_icache_range((unsigned long)mod->module_init, | |
3071 | (unsigned long)mod->module_init | |
3072 | + mod->init_size); | |
3073 | flush_icache_range((unsigned long)mod->module_core, | |
3074 | (unsigned long)mod->module_core + mod->core_size); | |
3075 | ||
3076 | set_fs(old_fs); | |
3077 | } | |
3078 | ||
74e08fcf JB |
3079 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3080 | Elf_Shdr *sechdrs, | |
3081 | char *secstrings, | |
3082 | struct module *mod) | |
3083 | { | |
3084 | return 0; | |
3085 | } | |
3086 | ||
2f3238ae | 3087 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3088 | { |
d913188c | 3089 | /* Module within temporary copy. */ |
1da177e4 | 3090 | struct module *mod; |
d913188c | 3091 | int err; |
3ae91c21 | 3092 | |
2f3238ae | 3093 | mod = setup_load_info(info, flags); |
d913188c RR |
3094 | if (IS_ERR(mod)) |
3095 | return mod; | |
1da177e4 | 3096 | |
2f3238ae | 3097 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
3098 | if (err) |
3099 | return ERR_PTR(err); | |
1da177e4 | 3100 | |
1da177e4 | 3101 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
3102 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
3103 | info->secstrings, mod); | |
1da177e4 | 3104 | if (err < 0) |
8d8022e8 | 3105 | return ERR_PTR(err); |
1da177e4 | 3106 | |
8d8022e8 RR |
3107 | /* We will do a special allocation for per-cpu sections later. */ |
3108 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 LT |
3109 | |
3110 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
3111 | this is done generically; there doesn't appear to be any | |
3112 | special cases for the architectures. */ | |
49668688 | 3113 | layout_sections(mod, info); |
49668688 | 3114 | layout_symtab(mod, info); |
1da177e4 | 3115 | |
65b8a9b4 | 3116 | /* Allocate and move to the final place */ |
49668688 | 3117 | err = move_module(mod, info); |
d913188c | 3118 | if (err) |
8d8022e8 | 3119 | return ERR_PTR(err); |
d913188c RR |
3120 | |
3121 | /* Module has been copied to its final place now: return it. */ | |
3122 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3123 | kmemleak_load_module(mod, info); |
d913188c | 3124 | return mod; |
d913188c RR |
3125 | } |
3126 | ||
3127 | /* mod is no longer valid after this! */ | |
3128 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3129 | { | |
d913188c | 3130 | percpu_modfree(mod); |
d453cded | 3131 | module_arch_freeing_init(mod); |
be1f221c RR |
3132 | module_memfree(mod->module_init); |
3133 | module_memfree(mod->module_core); | |
d913188c RR |
3134 | } |
3135 | ||
74e08fcf JB |
3136 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3137 | const Elf_Shdr *sechdrs, | |
3138 | struct module *me) | |
3139 | { | |
3140 | return 0; | |
3141 | } | |
3142 | ||
811d66a0 RR |
3143 | static int post_relocation(struct module *mod, const struct load_info *info) |
3144 | { | |
51f3d0f4 | 3145 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3146 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3147 | ||
3148 | /* Copy relocated percpu area over. */ | |
3149 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3150 | info->sechdrs[info->index.pcpu].sh_size); | |
3151 | ||
51f3d0f4 | 3152 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3153 | add_kallsyms(mod, info); |
3154 | ||
3155 | /* Arch-specific module finalizing. */ | |
3156 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3157 | } | |
3158 | ||
9bb9c3be RR |
3159 | /* Is this module of this name done loading? No locks held. */ |
3160 | static bool finished_loading(const char *name) | |
3161 | { | |
3162 | struct module *mod; | |
3163 | bool ret; | |
3164 | ||
9cc019b8 PZ |
3165 | /* |
3166 | * The module_mutex should not be a heavily contended lock; | |
3167 | * if we get the occasional sleep here, we'll go an extra iteration | |
3168 | * in the wait_event_interruptible(), which is harmless. | |
3169 | */ | |
3170 | sched_annotate_sleep(); | |
9bb9c3be | 3171 | mutex_lock(&module_mutex); |
4f6de4d5 | 3172 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3173 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3174 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3175 | mutex_unlock(&module_mutex); |
3176 | ||
3177 | return ret; | |
3178 | } | |
3179 | ||
34e1169d KC |
3180 | /* Call module constructors. */ |
3181 | static void do_mod_ctors(struct module *mod) | |
3182 | { | |
3183 | #ifdef CONFIG_CONSTRUCTORS | |
3184 | unsigned long i; | |
3185 | ||
3186 | for (i = 0; i < mod->num_ctors; i++) | |
3187 | mod->ctors[i](); | |
3188 | #endif | |
3189 | } | |
3190 | ||
c7496379 RR |
3191 | /* For freeing module_init on success, in case kallsyms traversing */ |
3192 | struct mod_initfree { | |
3193 | struct rcu_head rcu; | |
3194 | void *module_init; | |
3195 | }; | |
3196 | ||
3197 | static void do_free_init(struct rcu_head *head) | |
3198 | { | |
3199 | struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); | |
3200 | module_memfree(m->module_init); | |
3201 | kfree(m); | |
3202 | } | |
3203 | ||
be02a186 JK |
3204 | /* |
3205 | * This is where the real work happens. | |
3206 | * | |
3207 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3208 | * helper command 'lx-symbols'. | |
3209 | */ | |
3210 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3211 | { |
3212 | int ret = 0; | |
c7496379 RR |
3213 | struct mod_initfree *freeinit; |
3214 | ||
3215 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3216 | if (!freeinit) { | |
3217 | ret = -ENOMEM; | |
3218 | goto fail; | |
3219 | } | |
3220 | freeinit->module_init = mod->module_init; | |
34e1169d | 3221 | |
774a1221 TH |
3222 | /* |
3223 | * We want to find out whether @mod uses async during init. Clear | |
3224 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3225 | */ | |
3226 | current->flags &= ~PF_USED_ASYNC; | |
3227 | ||
34e1169d KC |
3228 | do_mod_ctors(mod); |
3229 | /* Start the module */ | |
3230 | if (mod->init != NULL) | |
3231 | ret = do_one_initcall(mod->init); | |
3232 | if (ret < 0) { | |
c7496379 | 3233 | goto fail_free_freeinit; |
34e1169d KC |
3234 | } |
3235 | if (ret > 0) { | |
bddb12b3 AM |
3236 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3237 | "follow 0/-E convention\n" | |
3238 | "%s: loading module anyway...\n", | |
3239 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3240 | dump_stack(); |
3241 | } | |
3242 | ||
3243 | /* Now it's a first class citizen! */ | |
3244 | mod->state = MODULE_STATE_LIVE; | |
3245 | blocking_notifier_call_chain(&module_notify_list, | |
3246 | MODULE_STATE_LIVE, mod); | |
3247 | ||
774a1221 TH |
3248 | /* |
3249 | * We need to finish all async code before the module init sequence | |
3250 | * is done. This has potential to deadlock. For example, a newly | |
3251 | * detected block device can trigger request_module() of the | |
3252 | * default iosched from async probing task. Once userland helper | |
3253 | * reaches here, async_synchronize_full() will wait on the async | |
3254 | * task waiting on request_module() and deadlock. | |
3255 | * | |
3256 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3257 | * iff module init queued any async jobs. This isn't a full | |
3258 | * solution as it will deadlock the same if module loading from | |
3259 | * async jobs nests more than once; however, due to the various | |
3260 | * constraints, this hack seems to be the best option for now. | |
3261 | * Please refer to the following thread for details. | |
3262 | * | |
3263 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3264 | */ | |
3265 | if (current->flags & PF_USED_ASYNC) | |
3266 | async_synchronize_full(); | |
34e1169d KC |
3267 | |
3268 | mutex_lock(&module_mutex); | |
3269 | /* Drop initial reference. */ | |
3270 | module_put(mod); | |
3271 | trim_init_extable(mod); | |
3272 | #ifdef CONFIG_KALLSYMS | |
3273 | mod->num_symtab = mod->core_num_syms; | |
3274 | mod->symtab = mod->core_symtab; | |
3275 | mod->strtab = mod->core_strtab; | |
3276 | #endif | |
93c2e105 | 3277 | mod_tree_remove_init(mod); |
34e1169d | 3278 | unset_module_init_ro_nx(mod); |
d453cded | 3279 | module_arch_freeing_init(mod); |
34e1169d KC |
3280 | mod->module_init = NULL; |
3281 | mod->init_size = 0; | |
3282 | mod->init_ro_size = 0; | |
3283 | mod->init_text_size = 0; | |
c7496379 RR |
3284 | /* |
3285 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be PZ |
3286 | * walking this with preempt disabled. In all the failure paths, we |
3287 | * call synchronize_sched(), but we don't want to slow down the success | |
3288 | * path, so use actual RCU here. | |
c7496379 | 3289 | */ |
0be964be | 3290 | call_rcu_sched(&freeinit->rcu, do_free_init); |
34e1169d KC |
3291 | mutex_unlock(&module_mutex); |
3292 | wake_up_all(&module_wq); | |
3293 | ||
3294 | return 0; | |
c7496379 RR |
3295 | |
3296 | fail_free_freeinit: | |
3297 | kfree(freeinit); | |
3298 | fail: | |
3299 | /* Try to protect us from buggy refcounters. */ | |
3300 | mod->state = MODULE_STATE_GOING; | |
3301 | synchronize_sched(); | |
3302 | module_put(mod); | |
3303 | blocking_notifier_call_chain(&module_notify_list, | |
3304 | MODULE_STATE_GOING, mod); | |
3305 | free_module(mod); | |
3306 | wake_up_all(&module_wq); | |
3307 | return ret; | |
34e1169d KC |
3308 | } |
3309 | ||
3310 | static int may_init_module(void) | |
3311 | { | |
3312 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3313 | return -EPERM; | |
3314 | ||
3315 | return 0; | |
3316 | } | |
3317 | ||
a3535c7e RR |
3318 | /* |
3319 | * We try to place it in the list now to make sure it's unique before | |
3320 | * we dedicate too many resources. In particular, temporary percpu | |
3321 | * memory exhaustion. | |
3322 | */ | |
3323 | static int add_unformed_module(struct module *mod) | |
3324 | { | |
3325 | int err; | |
3326 | struct module *old; | |
3327 | ||
3328 | mod->state = MODULE_STATE_UNFORMED; | |
3329 | ||
3330 | again: | |
3331 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3332 | old = find_module_all(mod->name, strlen(mod->name), true); |
3333 | if (old != NULL) { | |
a3535c7e RR |
3334 | if (old->state == MODULE_STATE_COMING |
3335 | || old->state == MODULE_STATE_UNFORMED) { | |
3336 | /* Wait in case it fails to load. */ | |
3337 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3338 | err = wait_event_interruptible(module_wq, |
3339 | finished_loading(mod->name)); | |
a3535c7e RR |
3340 | if (err) |
3341 | goto out_unlocked; | |
3342 | goto again; | |
3343 | } | |
3344 | err = -EEXIST; | |
3345 | goto out; | |
3346 | } | |
3347 | list_add_rcu(&mod->list, &modules); | |
93c2e105 | 3348 | mod_tree_insert(mod); |
a3535c7e RR |
3349 | err = 0; |
3350 | ||
3351 | out: | |
3352 | mutex_unlock(&module_mutex); | |
3353 | out_unlocked: | |
3354 | return err; | |
3355 | } | |
3356 | ||
3357 | static int complete_formation(struct module *mod, struct load_info *info) | |
3358 | { | |
3359 | int err; | |
3360 | ||
3361 | mutex_lock(&module_mutex); | |
3362 | ||
3363 | /* Find duplicate symbols (must be called under lock). */ | |
3364 | err = verify_export_symbols(mod); | |
3365 | if (err < 0) | |
3366 | goto out; | |
3367 | ||
3368 | /* This relies on module_mutex for list integrity. */ | |
3369 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3370 | ||
4982223e RR |
3371 | /* Set RO and NX regions for core */ |
3372 | set_section_ro_nx(mod->module_core, | |
3373 | mod->core_text_size, | |
3374 | mod->core_ro_size, | |
3375 | mod->core_size); | |
3376 | ||
3377 | /* Set RO and NX regions for init */ | |
3378 | set_section_ro_nx(mod->module_init, | |
3379 | mod->init_text_size, | |
3380 | mod->init_ro_size, | |
3381 | mod->init_size); | |
3382 | ||
a3535c7e RR |
3383 | /* Mark state as coming so strong_try_module_get() ignores us, |
3384 | * but kallsyms etc. can see us. */ | |
3385 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3386 | mutex_unlock(&module_mutex); |
3387 | ||
3388 | blocking_notifier_call_chain(&module_notify_list, | |
3389 | MODULE_STATE_COMING, mod); | |
3390 | return 0; | |
a3535c7e RR |
3391 | |
3392 | out: | |
3393 | mutex_unlock(&module_mutex); | |
3394 | return err; | |
3395 | } | |
3396 | ||
54041d8a RR |
3397 | static int unknown_module_param_cb(char *param, char *val, const char *modname) |
3398 | { | |
6da0b565 | 3399 | /* Check for magic 'dyndbg' arg */ |
54041d8a | 3400 | int ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3401 | if (ret != 0) |
3402 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3403 | return 0; |
3404 | } | |
3405 | ||
d913188c RR |
3406 | /* Allocate and load the module: note that size of section 0 is always |
3407 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3408 | static int load_module(struct load_info *info, const char __user *uargs, |
3409 | int flags) | |
d913188c | 3410 | { |
a3535c7e | 3411 | struct module *mod; |
d913188c | 3412 | long err; |
51e158c1 | 3413 | char *after_dashes; |
d913188c | 3414 | |
34e1169d KC |
3415 | err = module_sig_check(info); |
3416 | if (err) | |
3417 | goto free_copy; | |
d913188c | 3418 | |
34e1169d | 3419 | err = elf_header_check(info); |
d913188c | 3420 | if (err) |
34e1169d | 3421 | goto free_copy; |
d913188c RR |
3422 | |
3423 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3424 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3425 | if (IS_ERR(mod)) { |
3426 | err = PTR_ERR(mod); | |
d913188c | 3427 | goto free_copy; |
1da177e4 | 3428 | } |
1da177e4 | 3429 | |
a3535c7e RR |
3430 | /* Reserve our place in the list. */ |
3431 | err = add_unformed_module(mod); | |
3432 | if (err) | |
1fb9341a | 3433 | goto free_module; |
1fb9341a | 3434 | |
106a4ee2 | 3435 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3436 | mod->sig_ok = info->sig_ok; |
64748a2c | 3437 | if (!mod->sig_ok) { |
bddb12b3 | 3438 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3439 | "and/or required key missing - tainting " |
bddb12b3 | 3440 | "kernel\n", mod->name); |
66cc69e3 | 3441 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3442 | } |
106a4ee2 RR |
3443 | #endif |
3444 | ||
8d8022e8 | 3445 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3446 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3447 | if (err) |
3448 | goto unlink_mod; | |
3449 | ||
49668688 | 3450 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3451 | err = module_unload_init(mod); |
3452 | if (err) | |
1fb9341a | 3453 | goto unlink_mod; |
1da177e4 | 3454 | |
22e268eb RR |
3455 | /* Now we've got everything in the final locations, we can |
3456 | * find optional sections. */ | |
eb3057df FH |
3457 | err = find_module_sections(mod, info); |
3458 | if (err) | |
3459 | goto free_unload; | |
9b37ccfc | 3460 | |
49668688 | 3461 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3462 | if (err) |
3463 | goto free_unload; | |
9841d61d | 3464 | |
c988d2b2 | 3465 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3466 | setup_modinfo(mod, info); |
c988d2b2 | 3467 | |
1da177e4 | 3468 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3469 | err = simplify_symbols(mod, info); |
1da177e4 | 3470 | if (err < 0) |
d913188c | 3471 | goto free_modinfo; |
1da177e4 | 3472 | |
34e1169d | 3473 | err = apply_relocations(mod, info); |
22e268eb | 3474 | if (err < 0) |
d913188c | 3475 | goto free_modinfo; |
1da177e4 | 3476 | |
34e1169d | 3477 | err = post_relocation(mod, info); |
1da177e4 | 3478 | if (err < 0) |
d913188c | 3479 | goto free_modinfo; |
1da177e4 | 3480 | |
22e268eb | 3481 | flush_module_icache(mod); |
378bac82 | 3482 | |
6526c534 RR |
3483 | /* Now copy in args */ |
3484 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3485 | if (IS_ERR(mod->args)) { | |
3486 | err = PTR_ERR(mod->args); | |
3487 | goto free_arch_cleanup; | |
3488 | } | |
8d3b33f6 | 3489 | |
34e1169d | 3490 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3491 | |
a949ae56 SRRH |
3492 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3493 | ftrace_module_init(mod); | |
3494 | ||
a3535c7e RR |
3495 | /* Finally it's fully formed, ready to start executing. */ |
3496 | err = complete_formation(mod, info); | |
3497 | if (err) | |
1fb9341a | 3498 | goto ddebug_cleanup; |
be593f4c | 3499 | |
51f3d0f4 | 3500 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 RR |
3501 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
3502 | -32768, 32767, unknown_module_param_cb); | |
3503 | if (IS_ERR(after_dashes)) { | |
3504 | err = PTR_ERR(after_dashes); | |
1fb9341a | 3505 | goto bug_cleanup; |
51e158c1 RR |
3506 | } else if (after_dashes) { |
3507 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3508 | mod->name, after_dashes); | |
3509 | } | |
1da177e4 | 3510 | |
51f3d0f4 | 3511 | /* Link in to syfs. */ |
34e1169d | 3512 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3513 | if (err < 0) |
1fb9341a | 3514 | goto bug_cleanup; |
80a3d1bb | 3515 | |
48fd1188 | 3516 | /* Get rid of temporary copy. */ |
34e1169d | 3517 | free_copy(info); |
1da177e4 LT |
3518 | |
3519 | /* Done! */ | |
51f3d0f4 | 3520 | trace_module_load(mod); |
34e1169d KC |
3521 | |
3522 | return do_init_module(mod); | |
1da177e4 | 3523 | |
1fb9341a RR |
3524 | bug_cleanup: |
3525 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3526 | mutex_lock(&module_mutex); |
5336377d | 3527 | module_bug_cleanup(mod); |
ee61abb3 | 3528 | mutex_unlock(&module_mutex); |
ff7e0055 AL |
3529 | |
3530 | /* we can't deallocate the module until we clear memory protection */ | |
3531 | unset_module_init_ro_nx(mod); | |
3532 | unset_module_core_ro_nx(mod); | |
3533 | ||
a3535c7e | 3534 | ddebug_cleanup: |
1fb9341a | 3535 | dynamic_debug_remove(info->debug); |
e91defa2 | 3536 | synchronize_sched(); |
6526c534 RR |
3537 | kfree(mod->args); |
3538 | free_arch_cleanup: | |
1da177e4 | 3539 | module_arch_cleanup(mod); |
d913188c | 3540 | free_modinfo: |
a263f776 | 3541 | free_modinfo(mod); |
22e268eb | 3542 | free_unload: |
1da177e4 | 3543 | module_unload_free(mod); |
1fb9341a RR |
3544 | unlink_mod: |
3545 | mutex_lock(&module_mutex); | |
3546 | /* Unlink carefully: kallsyms could be walking list. */ | |
3547 | list_del_rcu(&mod->list); | |
3548 | wake_up_all(&module_wq); | |
0be964be PZ |
3549 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
3550 | synchronize_sched(); | |
1fb9341a | 3551 | mutex_unlock(&module_mutex); |
d913188c | 3552 | free_module: |
35a9393c PZ |
3553 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
3554 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
3555 | ||
34e1169d | 3556 | module_deallocate(mod, info); |
d913188c | 3557 | free_copy: |
34e1169d KC |
3558 | free_copy(info); |
3559 | return err; | |
b99b87f7 PO |
3560 | } |
3561 | ||
17da2bd9 HC |
3562 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3563 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3564 | { |
34e1169d KC |
3565 | int err; |
3566 | struct load_info info = { }; | |
1da177e4 | 3567 | |
34e1169d KC |
3568 | err = may_init_module(); |
3569 | if (err) | |
3570 | return err; | |
1da177e4 | 3571 | |
34e1169d KC |
3572 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3573 | umod, len, uargs); | |
1da177e4 | 3574 | |
34e1169d KC |
3575 | err = copy_module_from_user(umod, len, &info); |
3576 | if (err) | |
3577 | return err; | |
1da177e4 | 3578 | |
2f3238ae | 3579 | return load_module(&info, uargs, 0); |
34e1169d | 3580 | } |
94462ad3 | 3581 | |
2f3238ae | 3582 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d KC |
3583 | { |
3584 | int err; | |
3585 | struct load_info info = { }; | |
94462ad3 | 3586 | |
34e1169d KC |
3587 | err = may_init_module(); |
3588 | if (err) | |
3589 | return err; | |
1da177e4 | 3590 | |
2f3238ae | 3591 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3592 | |
2f3238ae RR |
3593 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3594 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3595 | return -EINVAL; | |
d6de2c80 | 3596 | |
34e1169d KC |
3597 | err = copy_module_from_fd(fd, &info); |
3598 | if (err) | |
3599 | return err; | |
1da177e4 | 3600 | |
2f3238ae | 3601 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3602 | } |
3603 | ||
3604 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3605 | { | |
3606 | return ((void *)addr >= start && (void *)addr < start + size); | |
3607 | } | |
3608 | ||
3609 | #ifdef CONFIG_KALLSYMS | |
3610 | /* | |
3611 | * This ignores the intensely annoying "mapping symbols" found | |
3612 | * in ARM ELF files: $a, $t and $d. | |
3613 | */ | |
3614 | static inline int is_arm_mapping_symbol(const char *str) | |
3615 | { | |
2e3a10a1 RK |
3616 | if (str[0] == '.' && str[1] == 'L') |
3617 | return true; | |
6c34f1f5 | 3618 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3619 | && (str[2] == '\0' || str[2] == '.'); |
3620 | } | |
3621 | ||
3622 | static const char *get_ksymbol(struct module *mod, | |
3623 | unsigned long addr, | |
3624 | unsigned long *size, | |
3625 | unsigned long *offset) | |
3626 | { | |
3627 | unsigned int i, best = 0; | |
3628 | unsigned long nextval; | |
3629 | ||
3630 | /* At worse, next value is at end of module */ | |
a06f6211 | 3631 | if (within_module_init(addr, mod)) |
1da177e4 | 3632 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 3633 | else |
1da177e4 LT |
3634 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
3635 | ||
25985edc | 3636 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3637 | starts real symbols at 1). */ |
1da177e4 LT |
3638 | for (i = 1; i < mod->num_symtab; i++) { |
3639 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
3640 | continue; | |
3641 | ||
3642 | /* We ignore unnamed symbols: they're uninformative | |
3643 | * and inserted at a whim. */ | |
3644 | if (mod->symtab[i].st_value <= addr | |
3645 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
3646 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3647 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3648 | best = i; | |
3649 | if (mod->symtab[i].st_value > addr | |
3650 | && mod->symtab[i].st_value < nextval | |
3651 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3652 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3653 | nextval = mod->symtab[i].st_value; | |
3654 | } | |
3655 | ||
3656 | if (!best) | |
3657 | return NULL; | |
3658 | ||
ffb45122 AD |
3659 | if (size) |
3660 | *size = nextval - mod->symtab[best].st_value; | |
3661 | if (offset) | |
3662 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
3663 | return mod->strtab + mod->symtab[best].st_name; |
3664 | } | |
3665 | ||
6dd06c9f RR |
3666 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3667 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3668 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3669 | unsigned long *size, |
3670 | unsigned long *offset, | |
3671 | char **modname, | |
3672 | char *namebuf) | |
1da177e4 | 3673 | { |
cb2a5205 | 3674 | const char *ret = NULL; |
b7df4d1b | 3675 | struct module *mod; |
1da177e4 | 3676 | |
cb2a5205 | 3677 | preempt_disable(); |
b7df4d1b PZ |
3678 | mod = __module_address(addr); |
3679 | if (mod) { | |
3680 | if (modname) | |
3681 | *modname = mod->name; | |
3682 | ret = get_ksymbol(mod, addr, size, offset); | |
1da177e4 | 3683 | } |
6dd06c9f RR |
3684 | /* Make a copy in here where it's safe */ |
3685 | if (ret) { | |
3686 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3687 | ret = namebuf; | |
3688 | } | |
cb2a5205 | 3689 | preempt_enable(); |
b7df4d1b | 3690 | |
92dfc9dc | 3691 | return ret; |
1da177e4 LT |
3692 | } |
3693 | ||
9d65cb4a AD |
3694 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3695 | { | |
3696 | struct module *mod; | |
3697 | ||
cb2a5205 | 3698 | preempt_disable(); |
d72b3751 | 3699 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3700 | if (mod->state == MODULE_STATE_UNFORMED) |
3701 | continue; | |
9b20a352 | 3702 | if (within_module(addr, mod)) { |
9d65cb4a AD |
3703 | const char *sym; |
3704 | ||
3705 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3706 | if (!sym) | |
3707 | goto out; | |
9281acea | 3708 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3709 | preempt_enable(); |
9d65cb4a AD |
3710 | return 0; |
3711 | } | |
3712 | } | |
3713 | out: | |
cb2a5205 | 3714 | preempt_enable(); |
9d65cb4a AD |
3715 | return -ERANGE; |
3716 | } | |
3717 | ||
a5c43dae AD |
3718 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3719 | unsigned long *offset, char *modname, char *name) | |
3720 | { | |
3721 | struct module *mod; | |
3722 | ||
cb2a5205 | 3723 | preempt_disable(); |
d72b3751 | 3724 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3725 | if (mod->state == MODULE_STATE_UNFORMED) |
3726 | continue; | |
9b20a352 | 3727 | if (within_module(addr, mod)) { |
a5c43dae AD |
3728 | const char *sym; |
3729 | ||
3730 | sym = get_ksymbol(mod, addr, size, offset); | |
3731 | if (!sym) | |
3732 | goto out; | |
3733 | if (modname) | |
9281acea | 3734 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3735 | if (name) |
9281acea | 3736 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3737 | preempt_enable(); |
a5c43dae AD |
3738 | return 0; |
3739 | } | |
3740 | } | |
3741 | out: | |
cb2a5205 | 3742 | preempt_enable(); |
a5c43dae AD |
3743 | return -ERANGE; |
3744 | } | |
3745 | ||
ea07890a AD |
3746 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3747 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3748 | { |
3749 | struct module *mod; | |
3750 | ||
cb2a5205 | 3751 | preempt_disable(); |
d72b3751 | 3752 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3753 | if (mod->state == MODULE_STATE_UNFORMED) |
3754 | continue; | |
1da177e4 LT |
3755 | if (symnum < mod->num_symtab) { |
3756 | *value = mod->symtab[symnum].st_value; | |
3757 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 3758 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
3759 | KSYM_NAME_LEN); |
3760 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 3761 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3762 | preempt_enable(); |
ea07890a | 3763 | return 0; |
1da177e4 LT |
3764 | } |
3765 | symnum -= mod->num_symtab; | |
3766 | } | |
cb2a5205 | 3767 | preempt_enable(); |
ea07890a | 3768 | return -ERANGE; |
1da177e4 LT |
3769 | } |
3770 | ||
3771 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3772 | { | |
3773 | unsigned int i; | |
3774 | ||
3775 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
3776 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3777 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
3778 | return mod->symtab[i].st_value; |
3779 | return 0; | |
3780 | } | |
3781 | ||
3782 | /* Look for this name: can be of form module:name. */ | |
3783 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3784 | { | |
3785 | struct module *mod; | |
3786 | char *colon; | |
3787 | unsigned long ret = 0; | |
3788 | ||
3789 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3790 | preempt_disable(); |
1da177e4 | 3791 | if ((colon = strchr(name, ':')) != NULL) { |
4f6de4d5 | 3792 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 3793 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 3794 | } else { |
0d21b0e3 RR |
3795 | list_for_each_entry_rcu(mod, &modules, list) { |
3796 | if (mod->state == MODULE_STATE_UNFORMED) | |
3797 | continue; | |
1da177e4 LT |
3798 | if ((ret = mod_find_symname(mod, name)) != 0) |
3799 | break; | |
0d21b0e3 | 3800 | } |
1da177e4 | 3801 | } |
cb2a5205 | 3802 | preempt_enable(); |
1da177e4 LT |
3803 | return ret; |
3804 | } | |
75a66614 AK |
3805 | |
3806 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3807 | struct module *, unsigned long), | |
3808 | void *data) | |
3809 | { | |
3810 | struct module *mod; | |
3811 | unsigned int i; | |
3812 | int ret; | |
3813 | ||
0be964be PZ |
3814 | module_assert_mutex(); |
3815 | ||
75a66614 | 3816 | list_for_each_entry(mod, &modules, list) { |
0d21b0e3 RR |
3817 | if (mod->state == MODULE_STATE_UNFORMED) |
3818 | continue; | |
75a66614 AK |
3819 | for (i = 0; i < mod->num_symtab; i++) { |
3820 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3821 | mod, mod->symtab[i].st_value); | |
3822 | if (ret != 0) | |
3823 | return ret; | |
3824 | } | |
3825 | } | |
3826 | return 0; | |
3827 | } | |
1da177e4 LT |
3828 | #endif /* CONFIG_KALLSYMS */ |
3829 | ||
21aa9280 | 3830 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3831 | { |
3832 | int bx = 0; | |
3833 | ||
0d21b0e3 | 3834 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
3835 | if (mod->taints || |
3836 | mod->state == MODULE_STATE_GOING || | |
3837 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3838 | buf[bx++] = '('; |
cca3e707 | 3839 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
3840 | /* Show a - for module-is-being-unloaded */ |
3841 | if (mod->state == MODULE_STATE_GOING) | |
3842 | buf[bx++] = '-'; | |
3843 | /* Show a + for module-is-being-loaded */ | |
3844 | if (mod->state == MODULE_STATE_COMING) | |
3845 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3846 | buf[bx++] = ')'; |
3847 | } | |
3848 | buf[bx] = '\0'; | |
3849 | ||
3850 | return buf; | |
3851 | } | |
3852 | ||
3b5d5c6b AD |
3853 | #ifdef CONFIG_PROC_FS |
3854 | /* Called by the /proc file system to return a list of modules. */ | |
3855 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3856 | { | |
3857 | mutex_lock(&module_mutex); | |
3858 | return seq_list_start(&modules, *pos); | |
3859 | } | |
3860 | ||
3861 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3862 | { | |
3863 | return seq_list_next(p, &modules, pos); | |
3864 | } | |
3865 | ||
3866 | static void m_stop(struct seq_file *m, void *p) | |
3867 | { | |
3868 | mutex_unlock(&module_mutex); | |
3869 | } | |
3870 | ||
1da177e4 LT |
3871 | static int m_show(struct seq_file *m, void *p) |
3872 | { | |
3873 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3874 | char buf[8]; |
3875 | ||
0d21b0e3 RR |
3876 | /* We always ignore unformed modules. */ |
3877 | if (mod->state == MODULE_STATE_UNFORMED) | |
3878 | return 0; | |
3879 | ||
2f0f2a33 | 3880 | seq_printf(m, "%s %u", |
1da177e4 LT |
3881 | mod->name, mod->init_size + mod->core_size); |
3882 | print_unload_info(m, mod); | |
3883 | ||
3884 | /* Informative for users. */ | |
3885 | seq_printf(m, " %s", | |
6da0b565 IA |
3886 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
3887 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
3888 | "Live"); |
3889 | /* Used by oprofile and other similar tools. */ | |
9f36e2c4 | 3890 | seq_printf(m, " 0x%pK", mod->module_core); |
1da177e4 | 3891 | |
fa3ba2e8 FM |
3892 | /* Taints info */ |
3893 | if (mod->taints) | |
21aa9280 | 3894 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3895 | |
6da0b565 | 3896 | seq_puts(m, "\n"); |
1da177e4 LT |
3897 | return 0; |
3898 | } | |
3899 | ||
3900 | /* Format: modulename size refcount deps address | |
3901 | ||
3902 | Where refcount is a number or -, and deps is a comma-separated list | |
3903 | of depends or -. | |
3904 | */ | |
3b5d5c6b | 3905 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3906 | .start = m_start, |
3907 | .next = m_next, | |
3908 | .stop = m_stop, | |
3909 | .show = m_show | |
3910 | }; | |
3911 | ||
3b5d5c6b AD |
3912 | static int modules_open(struct inode *inode, struct file *file) |
3913 | { | |
3914 | return seq_open(file, &modules_op); | |
3915 | } | |
3916 | ||
3917 | static const struct file_operations proc_modules_operations = { | |
3918 | .open = modules_open, | |
3919 | .read = seq_read, | |
3920 | .llseek = seq_lseek, | |
3921 | .release = seq_release, | |
3922 | }; | |
3923 | ||
3924 | static int __init proc_modules_init(void) | |
3925 | { | |
3926 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3927 | return 0; | |
3928 | } | |
3929 | module_init(proc_modules_init); | |
3930 | #endif | |
3931 | ||
1da177e4 LT |
3932 | /* Given an address, look for it in the module exception tables. */ |
3933 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3934 | { | |
1da177e4 LT |
3935 | const struct exception_table_entry *e = NULL; |
3936 | struct module *mod; | |
3937 | ||
24da1cbf | 3938 | preempt_disable(); |
d72b3751 | 3939 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3940 | if (mod->state == MODULE_STATE_UNFORMED) |
3941 | continue; | |
1da177e4 LT |
3942 | if (mod->num_exentries == 0) |
3943 | continue; | |
22a8bdeb | 3944 | |
1da177e4 LT |
3945 | e = search_extable(mod->extable, |
3946 | mod->extable + mod->num_exentries - 1, | |
3947 | addr); | |
3948 | if (e) | |
3949 | break; | |
3950 | } | |
24da1cbf | 3951 | preempt_enable(); |
1da177e4 LT |
3952 | |
3953 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3954 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3955 | return e; |
3956 | } | |
3957 | ||
4d435f9d | 3958 | /* |
e610499e RR |
3959 | * is_module_address - is this address inside a module? |
3960 | * @addr: the address to check. | |
3961 | * | |
3962 | * See is_module_text_address() if you simply want to see if the address | |
3963 | * is code (not data). | |
4d435f9d | 3964 | */ |
e610499e | 3965 | bool is_module_address(unsigned long addr) |
4d435f9d | 3966 | { |
e610499e | 3967 | bool ret; |
4d435f9d | 3968 | |
24da1cbf | 3969 | preempt_disable(); |
e610499e | 3970 | ret = __module_address(addr) != NULL; |
24da1cbf | 3971 | preempt_enable(); |
4d435f9d | 3972 | |
e610499e | 3973 | return ret; |
4d435f9d IM |
3974 | } |
3975 | ||
e610499e RR |
3976 | /* |
3977 | * __module_address - get the module which contains an address. | |
3978 | * @addr: the address. | |
3979 | * | |
3980 | * Must be called with preempt disabled or module mutex held so that | |
3981 | * module doesn't get freed during this. | |
3982 | */ | |
714f83d5 | 3983 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3984 | { |
3985 | struct module *mod; | |
3986 | ||
3a642e99 RR |
3987 | if (addr < module_addr_min || addr > module_addr_max) |
3988 | return NULL; | |
3989 | ||
0be964be PZ |
3990 | module_assert_mutex_or_preempt(); |
3991 | ||
6c9692e2 | 3992 | mod = mod_find(addr); |
93c2e105 PZ |
3993 | if (mod) { |
3994 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 3995 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 3996 | mod = NULL; |
0d21b0e3 | 3997 | } |
93c2e105 | 3998 | return mod; |
1da177e4 | 3999 | } |
c6b37801 | 4000 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4001 | |
e610499e RR |
4002 | /* |
4003 | * is_module_text_address - is this address inside module code? | |
4004 | * @addr: the address to check. | |
4005 | * | |
4006 | * See is_module_address() if you simply want to see if the address is | |
4007 | * anywhere in a module. See kernel_text_address() for testing if an | |
4008 | * address corresponds to kernel or module code. | |
4009 | */ | |
4010 | bool is_module_text_address(unsigned long addr) | |
4011 | { | |
4012 | bool ret; | |
4013 | ||
4014 | preempt_disable(); | |
4015 | ret = __module_text_address(addr) != NULL; | |
4016 | preempt_enable(); | |
4017 | ||
4018 | return ret; | |
4019 | } | |
4020 | ||
4021 | /* | |
4022 | * __module_text_address - get the module whose code contains an address. | |
4023 | * @addr: the address. | |
4024 | * | |
4025 | * Must be called with preempt disabled or module mutex held so that | |
4026 | * module doesn't get freed during this. | |
4027 | */ | |
4028 | struct module *__module_text_address(unsigned long addr) | |
4029 | { | |
4030 | struct module *mod = __module_address(addr); | |
4031 | if (mod) { | |
4032 | /* Make sure it's within the text section. */ | |
4033 | if (!within(addr, mod->module_init, mod->init_text_size) | |
4034 | && !within(addr, mod->module_core, mod->core_text_size)) | |
4035 | mod = NULL; | |
4036 | } | |
4037 | return mod; | |
4038 | } | |
c6b37801 | 4039 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4040 | |
1da177e4 LT |
4041 | /* Don't grab lock, we're oopsing. */ |
4042 | void print_modules(void) | |
4043 | { | |
4044 | struct module *mod; | |
2bc2d61a | 4045 | char buf[8]; |
1da177e4 | 4046 | |
b231125a | 4047 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4048 | /* Most callers should already have preempt disabled, but make sure */ |
4049 | preempt_disable(); | |
0d21b0e3 RR |
4050 | list_for_each_entry_rcu(mod, &modules, list) { |
4051 | if (mod->state == MODULE_STATE_UNFORMED) | |
4052 | continue; | |
27bba4d6 | 4053 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4054 | } |
d72b3751 | 4055 | preempt_enable(); |
e14af7ee | 4056 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4057 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4058 | pr_cont("\n"); | |
1da177e4 LT |
4059 | } |
4060 | ||
1da177e4 | 4061 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4062 | /* Generate the signature for all relevant module structures here. |
4063 | * If these change, we don't want to try to parse the module. */ | |
4064 | void module_layout(struct module *mod, | |
4065 | struct modversion_info *ver, | |
4066 | struct kernel_param *kp, | |
4067 | struct kernel_symbol *ks, | |
65498646 | 4068 | struct tracepoint * const *tp) |
8c8ef42a RR |
4069 | { |
4070 | } | |
4071 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4072 | #endif |