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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 MC |
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 | ||
4f666546 PZ |
173 | static struct mod_tree_root { |
174 | struct latch_tree_root root; | |
175 | unsigned long addr_min; | |
176 | unsigned long addr_max; | |
177 | } mod_tree __cacheline_aligned = { | |
178 | .addr_min = -1UL, | |
179 | }; | |
180 | ||
181 | #define module_addr_min mod_tree.addr_min | |
182 | #define module_addr_max mod_tree.addr_max | |
183 | ||
184 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
185 | { | |
186 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
187 | } | |
188 | ||
189 | static void __mod_tree_remove(struct mod_tree_node *node) | |
190 | { | |
191 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
192 | } | |
93c2e105 PZ |
193 | |
194 | /* | |
195 | * These modifications: insert, remove_init and remove; are serialized by the | |
196 | * module_mutex. | |
197 | */ | |
198 | static void mod_tree_insert(struct module *mod) | |
199 | { | |
200 | mod->mtn_core.mod = mod; | |
201 | mod->mtn_init.mod = mod; | |
202 | ||
4f666546 | 203 | __mod_tree_insert(&mod->mtn_core); |
93c2e105 | 204 | if (mod->init_size) |
4f666546 | 205 | __mod_tree_insert(&mod->mtn_init); |
93c2e105 PZ |
206 | } |
207 | ||
208 | static void mod_tree_remove_init(struct module *mod) | |
209 | { | |
210 | if (mod->init_size) | |
4f666546 | 211 | __mod_tree_remove(&mod->mtn_init); |
93c2e105 PZ |
212 | } |
213 | ||
214 | static void mod_tree_remove(struct module *mod) | |
215 | { | |
4f666546 | 216 | __mod_tree_remove(&mod->mtn_core); |
93c2e105 PZ |
217 | mod_tree_remove_init(mod); |
218 | } | |
219 | ||
6c9692e2 | 220 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
221 | { |
222 | struct latch_tree_node *ltn; | |
223 | ||
4f666546 | 224 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
225 | if (!ltn) |
226 | return NULL; | |
227 | ||
228 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
229 | } | |
230 | ||
6c9692e2 PZ |
231 | #else /* MODULES_TREE_LOOKUP */ |
232 | ||
4f666546 PZ |
233 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
234 | ||
6c9692e2 PZ |
235 | static void mod_tree_insert(struct module *mod) { } |
236 | static void mod_tree_remove_init(struct module *mod) { } | |
237 | static void mod_tree_remove(struct module *mod) { } | |
238 | ||
239 | static struct module *mod_find(unsigned long addr) | |
240 | { | |
241 | struct module *mod; | |
242 | ||
243 | list_for_each_entry_rcu(mod, &modules, list) { | |
244 | if (within_module(addr, mod)) | |
245 | return mod; | |
246 | } | |
247 | ||
248 | return NULL; | |
249 | } | |
250 | ||
251 | #endif /* MODULES_TREE_LOOKUP */ | |
252 | ||
4f666546 PZ |
253 | /* |
254 | * Bounds of module text, for speeding up __module_address. | |
255 | * Protected by module_mutex. | |
256 | */ | |
257 | static void __mod_update_bounds(void *base, unsigned int size) | |
258 | { | |
259 | unsigned long min = (unsigned long)base; | |
260 | unsigned long max = min + size; | |
261 | ||
262 | if (min < module_addr_min) | |
263 | module_addr_min = min; | |
264 | if (max > module_addr_max) | |
265 | module_addr_max = max; | |
266 | } | |
267 | ||
268 | static void mod_update_bounds(struct module *mod) | |
269 | { | |
270 | __mod_update_bounds(mod->module_core, mod->core_size); | |
271 | if (mod->init_size) | |
272 | __mod_update_bounds(mod->module_init, mod->init_size); | |
273 | } | |
274 | ||
67fc4e0c JW |
275 | #ifdef CONFIG_KGDB_KDB |
276 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
277 | #endif /* CONFIG_KGDB_KDB */ | |
278 | ||
0be964be PZ |
279 | static void module_assert_mutex(void) |
280 | { | |
281 | lockdep_assert_held(&module_mutex); | |
282 | } | |
283 | ||
284 | static void module_assert_mutex_or_preempt(void) | |
285 | { | |
286 | #ifdef CONFIG_LOCKDEP | |
287 | if (unlikely(!debug_locks)) | |
288 | return; | |
289 | ||
290 | WARN_ON(!rcu_read_lock_sched_held() && | |
291 | !lockdep_is_held(&module_mutex)); | |
292 | #endif | |
293 | } | |
294 | ||
6727bb9c LR |
295 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
296 | #ifndef CONFIG_MODULE_SIG_FORCE | |
106a4ee2 RR |
297 | module_param(sig_enforce, bool_enable_only, 0644); |
298 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
1da177e4 | 299 | |
19e4529e SR |
300 | /* Block module loading/unloading? */ |
301 | int modules_disabled = 0; | |
02608bef | 302 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 303 | |
c9a3ba55 RR |
304 | /* Waiting for a module to finish initializing? */ |
305 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
306 | ||
e041c683 | 307 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 308 | |
6da0b565 | 309 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 310 | { |
e041c683 | 311 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
312 | } |
313 | EXPORT_SYMBOL(register_module_notifier); | |
314 | ||
6da0b565 | 315 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 316 | { |
e041c683 | 317 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
318 | } |
319 | EXPORT_SYMBOL(unregister_module_notifier); | |
320 | ||
eded41c1 RR |
321 | struct load_info { |
322 | Elf_Ehdr *hdr; | |
323 | unsigned long len; | |
324 | Elf_Shdr *sechdrs; | |
6526c534 | 325 | char *secstrings, *strtab; |
d913188c | 326 | unsigned long symoffs, stroffs; |
811d66a0 RR |
327 | struct _ddebug *debug; |
328 | unsigned int num_debug; | |
106a4ee2 | 329 | bool sig_ok; |
eded41c1 RR |
330 | struct { |
331 | unsigned int sym, str, mod, vers, info, pcpu; | |
332 | } index; | |
333 | }; | |
334 | ||
9a4b9708 ML |
335 | /* We require a truly strong try_module_get(): 0 means failure due to |
336 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
337 | static inline int strong_try_module_get(struct module *mod) |
338 | { | |
0d21b0e3 | 339 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 340 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
341 | return -EBUSY; |
342 | if (try_module_get(mod)) | |
1da177e4 | 343 | return 0; |
c9a3ba55 RR |
344 | else |
345 | return -ENOENT; | |
1da177e4 LT |
346 | } |
347 | ||
373d4d09 RR |
348 | static inline void add_taint_module(struct module *mod, unsigned flag, |
349 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 350 | { |
373d4d09 | 351 | add_taint(flag, lockdep_ok); |
25ddbb18 | 352 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
353 | } |
354 | ||
02a3e59a RD |
355 | /* |
356 | * A thread that wants to hold a reference to a module only while it | |
357 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
358 | */ |
359 | void __module_put_and_exit(struct module *mod, long code) | |
360 | { | |
361 | module_put(mod); | |
362 | do_exit(code); | |
363 | } | |
364 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 365 | |
1da177e4 | 366 | /* Find a module section: 0 means not found. */ |
49668688 | 367 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
368 | { |
369 | unsigned int i; | |
370 | ||
49668688 RR |
371 | for (i = 1; i < info->hdr->e_shnum; i++) { |
372 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 373 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
374 | if ((shdr->sh_flags & SHF_ALLOC) |
375 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 376 | return i; |
49668688 | 377 | } |
1da177e4 LT |
378 | return 0; |
379 | } | |
380 | ||
5e458cc0 | 381 | /* Find a module section, or NULL. */ |
49668688 | 382 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
383 | { |
384 | /* Section 0 has sh_addr 0. */ | |
49668688 | 385 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
386 | } |
387 | ||
388 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 389 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
390 | const char *name, |
391 | size_t object_size, | |
392 | unsigned int *num) | |
393 | { | |
49668688 | 394 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
395 | |
396 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
397 | *num = info->sechdrs[sec].sh_size / object_size; |
398 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
399 | } |
400 | ||
1da177e4 LT |
401 | /* Provided by the linker */ |
402 | extern const struct kernel_symbol __start___ksymtab[]; | |
403 | extern const struct kernel_symbol __stop___ksymtab[]; | |
404 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
405 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
406 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
407 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
408 | extern const unsigned long __start___kcrctab[]; |
409 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 410 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
411 | #ifdef CONFIG_UNUSED_SYMBOLS |
412 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
413 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
414 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
415 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
416 | extern const unsigned long __start___kcrctab_unused[]; |
417 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 418 | #endif |
1da177e4 LT |
419 | |
420 | #ifndef CONFIG_MODVERSIONS | |
421 | #define symversion(base, idx) NULL | |
422 | #else | |
f83ca9fe | 423 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
424 | #endif |
425 | ||
dafd0940 RR |
426 | static bool each_symbol_in_section(const struct symsearch *arr, |
427 | unsigned int arrsize, | |
428 | struct module *owner, | |
429 | bool (*fn)(const struct symsearch *syms, | |
430 | struct module *owner, | |
de4d8d53 | 431 | void *data), |
dafd0940 | 432 | void *data) |
ad9546c9 | 433 | { |
de4d8d53 | 434 | unsigned int j; |
ad9546c9 | 435 | |
dafd0940 | 436 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
437 | if (fn(&arr[j], owner, data)) |
438 | return true; | |
f71d20e9 | 439 | } |
dafd0940 RR |
440 | |
441 | return false; | |
ad9546c9 RR |
442 | } |
443 | ||
dafd0940 | 444 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
445 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
446 | struct module *owner, | |
447 | void *data), | |
448 | void *data) | |
ad9546c9 RR |
449 | { |
450 | struct module *mod; | |
44032e63 | 451 | static const struct symsearch arr[] = { |
ad9546c9 | 452 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 453 | NOT_GPL_ONLY, false }, |
ad9546c9 | 454 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
455 | __start___kcrctab_gpl, |
456 | GPL_ONLY, false }, | |
ad9546c9 | 457 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
458 | __start___kcrctab_gpl_future, |
459 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 460 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 461 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
462 | __start___kcrctab_unused, |
463 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 464 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
465 | __start___kcrctab_unused_gpl, |
466 | GPL_ONLY, true }, | |
f7f5b675 | 467 | #endif |
ad9546c9 | 468 | }; |
f71d20e9 | 469 | |
0be964be PZ |
470 | module_assert_mutex_or_preempt(); |
471 | ||
dafd0940 RR |
472 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
473 | return true; | |
f71d20e9 | 474 | |
d72b3751 | 475 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
476 | struct symsearch arr[] = { |
477 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 478 | NOT_GPL_ONLY, false }, |
ad9546c9 | 479 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
480 | mod->gpl_crcs, |
481 | GPL_ONLY, false }, | |
ad9546c9 RR |
482 | { mod->gpl_future_syms, |
483 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
484 | mod->gpl_future_crcs, |
485 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 486 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
487 | { mod->unused_syms, |
488 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
489 | mod->unused_crcs, |
490 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
491 | { mod->unused_gpl_syms, |
492 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
493 | mod->unused_gpl_crcs, |
494 | GPL_ONLY, true }, | |
f7f5b675 | 495 | #endif |
ad9546c9 RR |
496 | }; |
497 | ||
0d21b0e3 RR |
498 | if (mod->state == MODULE_STATE_UNFORMED) |
499 | continue; | |
500 | ||
dafd0940 RR |
501 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
502 | return true; | |
503 | } | |
504 | return false; | |
505 | } | |
de4d8d53 | 506 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
507 | |
508 | struct find_symbol_arg { | |
509 | /* Input */ | |
510 | const char *name; | |
511 | bool gplok; | |
512 | bool warn; | |
513 | ||
514 | /* Output */ | |
515 | struct module *owner; | |
516 | const unsigned long *crc; | |
414fd31b | 517 | const struct kernel_symbol *sym; |
dafd0940 RR |
518 | }; |
519 | ||
de4d8d53 RR |
520 | static bool check_symbol(const struct symsearch *syms, |
521 | struct module *owner, | |
522 | unsigned int symnum, void *data) | |
dafd0940 RR |
523 | { |
524 | struct find_symbol_arg *fsa = data; | |
525 | ||
dafd0940 RR |
526 | if (!fsa->gplok) { |
527 | if (syms->licence == GPL_ONLY) | |
528 | return false; | |
529 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
530 | pr_warn("Symbol %s is being used by a non-GPL module, " |
531 | "which will not be allowed in the future\n", | |
532 | fsa->name); | |
9f28bb7e | 533 | } |
1da177e4 | 534 | } |
ad9546c9 | 535 | |
f7f5b675 | 536 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 537 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
538 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
539 | "using it.\n", fsa->name); | |
540 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
541 | pr_warn("Please evaluate if this is the right api to use and " |
542 | "if it really is, submit a report to the linux kernel " | |
543 | "mailing list together with submitting your code for " | |
bddb12b3 | 544 | "inclusion.\n"); |
dafd0940 | 545 | } |
f7f5b675 | 546 | #endif |
dafd0940 RR |
547 | |
548 | fsa->owner = owner; | |
549 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 550 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
551 | return true; |
552 | } | |
553 | ||
403ed278 AIB |
554 | static int cmp_name(const void *va, const void *vb) |
555 | { | |
556 | const char *a; | |
557 | const struct kernel_symbol *b; | |
558 | a = va; b = vb; | |
559 | return strcmp(a, b->name); | |
560 | } | |
561 | ||
de4d8d53 RR |
562 | static bool find_symbol_in_section(const struct symsearch *syms, |
563 | struct module *owner, | |
564 | void *data) | |
565 | { | |
566 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
567 | struct kernel_symbol *sym; |
568 | ||
569 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
570 | sizeof(struct kernel_symbol), cmp_name); | |
571 | ||
572 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
573 | return true; | |
de4d8d53 | 574 | |
de4d8d53 RR |
575 | return false; |
576 | } | |
577 | ||
414fd31b | 578 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 579 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
580 | const struct kernel_symbol *find_symbol(const char *name, |
581 | struct module **owner, | |
582 | const unsigned long **crc, | |
583 | bool gplok, | |
584 | bool warn) | |
dafd0940 RR |
585 | { |
586 | struct find_symbol_arg fsa; | |
587 | ||
588 | fsa.name = name; | |
589 | fsa.gplok = gplok; | |
590 | fsa.warn = warn; | |
591 | ||
de4d8d53 | 592 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
593 | if (owner) |
594 | *owner = fsa.owner; | |
595 | if (crc) | |
596 | *crc = fsa.crc; | |
414fd31b | 597 | return fsa.sym; |
dafd0940 RR |
598 | } |
599 | ||
5e124169 | 600 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 601 | return NULL; |
1da177e4 | 602 | } |
c6b37801 | 603 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 604 | |
1da177e4 | 605 | /* Search for module by name: must hold module_mutex. */ |
4f6de4d5 | 606 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 607 | bool even_unformed) |
1da177e4 LT |
608 | { |
609 | struct module *mod; | |
610 | ||
0be964be PZ |
611 | module_assert_mutex(); |
612 | ||
1da177e4 | 613 | list_for_each_entry(mod, &modules, list) { |
0d21b0e3 RR |
614 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
615 | continue; | |
4f6de4d5 | 616 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
617 | return mod; |
618 | } | |
619 | return NULL; | |
620 | } | |
0d21b0e3 RR |
621 | |
622 | struct module *find_module(const char *name) | |
623 | { | |
4f6de4d5 | 624 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 625 | } |
c6b37801 | 626 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
627 | |
628 | #ifdef CONFIG_SMP | |
fbf59bc9 | 629 | |
259354de | 630 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 631 | { |
259354de TH |
632 | return mod->percpu; |
633 | } | |
fbf59bc9 | 634 | |
9eb76d77 | 635 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 636 | { |
9eb76d77 RR |
637 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
638 | unsigned long align = pcpusec->sh_addralign; | |
639 | ||
640 | if (!pcpusec->sh_size) | |
641 | return 0; | |
642 | ||
fbf59bc9 | 643 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
644 | pr_warn("%s: per-cpu alignment %li > %li\n", |
645 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
646 | align = PAGE_SIZE; |
647 | } | |
648 | ||
9eb76d77 | 649 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 650 | if (!mod->percpu) { |
bddb12b3 AM |
651 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
652 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
653 | return -ENOMEM; |
654 | } | |
9eb76d77 | 655 | mod->percpu_size = pcpusec->sh_size; |
259354de | 656 | return 0; |
fbf59bc9 TH |
657 | } |
658 | ||
259354de | 659 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 660 | { |
259354de | 661 | free_percpu(mod->percpu); |
fbf59bc9 TH |
662 | } |
663 | ||
49668688 | 664 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 665 | { |
49668688 | 666 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
667 | } |
668 | ||
259354de TH |
669 | static void percpu_modcopy(struct module *mod, |
670 | const void *from, unsigned long size) | |
6b588c18 TH |
671 | { |
672 | int cpu; | |
673 | ||
674 | for_each_possible_cpu(cpu) | |
259354de | 675 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
676 | } |
677 | ||
10fad5e4 TH |
678 | /** |
679 | * is_module_percpu_address - test whether address is from module static percpu | |
680 | * @addr: address to test | |
681 | * | |
682 | * Test whether @addr belongs to module static percpu area. | |
683 | * | |
684 | * RETURNS: | |
685 | * %true if @addr is from module static percpu area | |
686 | */ | |
687 | bool is_module_percpu_address(unsigned long addr) | |
688 | { | |
689 | struct module *mod; | |
690 | unsigned int cpu; | |
691 | ||
692 | preempt_disable(); | |
693 | ||
694 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
695 | if (mod->state == MODULE_STATE_UNFORMED) |
696 | continue; | |
10fad5e4 TH |
697 | if (!mod->percpu_size) |
698 | continue; | |
699 | for_each_possible_cpu(cpu) { | |
700 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
701 | ||
702 | if ((void *)addr >= start && | |
703 | (void *)addr < start + mod->percpu_size) { | |
704 | preempt_enable(); | |
705 | return true; | |
706 | } | |
707 | } | |
708 | } | |
709 | ||
710 | preempt_enable(); | |
711 | return false; | |
6b588c18 TH |
712 | } |
713 | ||
1da177e4 | 714 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 715 | |
259354de | 716 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
717 | { |
718 | return NULL; | |
719 | } | |
9eb76d77 | 720 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 721 | { |
9eb76d77 RR |
722 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
723 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
724 | return -ENOMEM; | |
725 | return 0; | |
259354de TH |
726 | } |
727 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 728 | { |
1da177e4 | 729 | } |
49668688 | 730 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
731 | { |
732 | return 0; | |
733 | } | |
259354de TH |
734 | static inline void percpu_modcopy(struct module *mod, |
735 | const void *from, unsigned long size) | |
1da177e4 LT |
736 | { |
737 | /* pcpusec should be 0, and size of that section should be 0. */ | |
738 | BUG_ON(size != 0); | |
739 | } | |
10fad5e4 TH |
740 | bool is_module_percpu_address(unsigned long addr) |
741 | { | |
742 | return false; | |
743 | } | |
6b588c18 | 744 | |
1da177e4 LT |
745 | #endif /* CONFIG_SMP */ |
746 | ||
c988d2b2 MD |
747 | #define MODINFO_ATTR(field) \ |
748 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
749 | { \ | |
750 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
751 | } \ | |
752 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 753 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 754 | { \ |
cc56ded3 | 755 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
756 | } \ |
757 | static int modinfo_##field##_exists(struct module *mod) \ | |
758 | { \ | |
759 | return mod->field != NULL; \ | |
760 | } \ | |
761 | static void free_modinfo_##field(struct module *mod) \ | |
762 | { \ | |
22a8bdeb DW |
763 | kfree(mod->field); \ |
764 | mod->field = NULL; \ | |
c988d2b2 MD |
765 | } \ |
766 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 767 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
768 | .show = show_modinfo_##field, \ |
769 | .setup = setup_modinfo_##field, \ | |
770 | .test = modinfo_##field##_exists, \ | |
771 | .free = free_modinfo_##field, \ | |
772 | }; | |
773 | ||
774 | MODINFO_ATTR(version); | |
775 | MODINFO_ATTR(srcversion); | |
776 | ||
e14af7ee AV |
777 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
778 | ||
03e88ae1 | 779 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
780 | |
781 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
782 | ||
e513cc1c MH |
783 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
784 | #define MODULE_REF_BASE 1 | |
785 | ||
1da177e4 | 786 | /* Init the unload section of the module. */ |
9f85a4bb | 787 | static int module_unload_init(struct module *mod) |
1da177e4 | 788 | { |
e513cc1c MH |
789 | /* |
790 | * Initialize reference counter to MODULE_REF_BASE. | |
791 | * refcnt == 0 means module is going. | |
792 | */ | |
793 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 794 | |
2c02dfe7 LT |
795 | INIT_LIST_HEAD(&mod->source_list); |
796 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 797 | |
1da177e4 | 798 | /* Hold reference count during initialization. */ |
e513cc1c | 799 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
800 | |
801 | return 0; | |
1da177e4 LT |
802 | } |
803 | ||
1da177e4 LT |
804 | /* Does a already use b? */ |
805 | static int already_uses(struct module *a, struct module *b) | |
806 | { | |
807 | struct module_use *use; | |
808 | ||
2c02dfe7 LT |
809 | list_for_each_entry(use, &b->source_list, source_list) { |
810 | if (use->source == a) { | |
5e124169 | 811 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
812 | return 1; |
813 | } | |
814 | } | |
5e124169 | 815 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
816 | return 0; |
817 | } | |
818 | ||
2c02dfe7 LT |
819 | /* |
820 | * Module a uses b | |
821 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
822 | * - the module_use is added to the list of 'b' sources (so | |
823 | * 'b' can walk the list to see who sourced them), and of 'a' | |
824 | * targets (so 'a' can see what modules it targets). | |
825 | */ | |
826 | static int add_module_usage(struct module *a, struct module *b) | |
827 | { | |
2c02dfe7 LT |
828 | struct module_use *use; |
829 | ||
5e124169 | 830 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
831 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
832 | if (!use) { | |
bddb12b3 | 833 | pr_warn("%s: out of memory loading\n", a->name); |
2c02dfe7 LT |
834 | return -ENOMEM; |
835 | } | |
836 | ||
837 | use->source = a; | |
838 | use->target = b; | |
839 | list_add(&use->source_list, &b->source_list); | |
840 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
841 | return 0; |
842 | } | |
843 | ||
75676500 | 844 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 845 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 846 | { |
c8e21ced | 847 | int err; |
270a6c4c | 848 | |
9bea7f23 | 849 | if (b == NULL || already_uses(a, b)) |
218ce735 | 850 | return 0; |
218ce735 | 851 | |
9bea7f23 RR |
852 | /* If module isn't available, we fail. */ |
853 | err = strong_try_module_get(b); | |
c9a3ba55 | 854 | if (err) |
9bea7f23 | 855 | return err; |
1da177e4 | 856 | |
2c02dfe7 LT |
857 | err = add_module_usage(a, b); |
858 | if (err) { | |
1da177e4 | 859 | module_put(b); |
9bea7f23 | 860 | return err; |
1da177e4 | 861 | } |
9bea7f23 | 862 | return 0; |
1da177e4 | 863 | } |
9bea7f23 | 864 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
865 | |
866 | /* Clear the unload stuff of the module. */ | |
867 | static void module_unload_free(struct module *mod) | |
868 | { | |
2c02dfe7 | 869 | struct module_use *use, *tmp; |
1da177e4 | 870 | |
75676500 | 871 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
872 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
873 | struct module *i = use->target; | |
5e124169 | 874 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
875 | module_put(i); |
876 | list_del(&use->source_list); | |
877 | list_del(&use->target_list); | |
878 | kfree(use); | |
1da177e4 | 879 | } |
75676500 | 880 | mutex_unlock(&module_mutex); |
1da177e4 LT |
881 | } |
882 | ||
883 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 884 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
885 | { |
886 | int ret = (flags & O_TRUNC); | |
887 | if (ret) | |
373d4d09 | 888 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
889 | return ret; |
890 | } | |
891 | #else | |
fb169793 | 892 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
893 | { |
894 | return 0; | |
895 | } | |
896 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
897 | ||
e513cc1c MH |
898 | /* Try to release refcount of module, 0 means success. */ |
899 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 900 | { |
e513cc1c | 901 | int ret; |
1da177e4 | 902 | |
e513cc1c MH |
903 | /* Try to decrement refcnt which we set at loading */ |
904 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
905 | BUG_ON(ret < 0); | |
906 | if (ret) | |
907 | /* Someone can put this right now, recover with checking */ | |
908 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 909 | |
e513cc1c MH |
910 | return ret; |
911 | } | |
1da177e4 | 912 | |
e513cc1c MH |
913 | static int try_stop_module(struct module *mod, int flags, int *forced) |
914 | { | |
da39ba5e | 915 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
916 | if (try_release_module_ref(mod) != 0) { |
917 | *forced = try_force_unload(flags); | |
918 | if (!(*forced)) | |
1da177e4 LT |
919 | return -EWOULDBLOCK; |
920 | } | |
921 | ||
922 | /* Mark it as dying. */ | |
e513cc1c | 923 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 924 | |
e513cc1c | 925 | return 0; |
1da177e4 LT |
926 | } |
927 | ||
d5db139a RR |
928 | /** |
929 | * module_refcount - return the refcount or -1 if unloading | |
930 | * | |
931 | * @mod: the module we're checking | |
932 | * | |
933 | * Returns: | |
934 | * -1 if the module is in the process of unloading | |
935 | * otherwise the number of references in the kernel to the module | |
936 | */ | |
937 | int module_refcount(struct module *mod) | |
1da177e4 | 938 | { |
d5db139a | 939 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
940 | } |
941 | EXPORT_SYMBOL(module_refcount); | |
942 | ||
943 | /* This exists whether we can unload or not */ | |
944 | static void free_module(struct module *mod); | |
945 | ||
17da2bd9 HC |
946 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
947 | unsigned int, flags) | |
1da177e4 LT |
948 | { |
949 | struct module *mod; | |
dfff0a06 | 950 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
951 | int ret, forced = 0; |
952 | ||
3d43321b | 953 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
954 | return -EPERM; |
955 | ||
956 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
957 | return -EFAULT; | |
958 | name[MODULE_NAME_LEN-1] = '\0'; | |
959 | ||
3fc1f1e2 TH |
960 | if (mutex_lock_interruptible(&module_mutex) != 0) |
961 | return -EINTR; | |
1da177e4 LT |
962 | |
963 | mod = find_module(name); | |
964 | if (!mod) { | |
965 | ret = -ENOENT; | |
966 | goto out; | |
967 | } | |
968 | ||
2c02dfe7 | 969 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
970 | /* Other modules depend on us: get rid of them first. */ |
971 | ret = -EWOULDBLOCK; | |
972 | goto out; | |
973 | } | |
974 | ||
975 | /* Doing init or already dying? */ | |
976 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 977 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 978 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
979 | ret = -EBUSY; |
980 | goto out; | |
981 | } | |
982 | ||
983 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 984 | if (mod->init && !mod->exit) { |
fb169793 | 985 | forced = try_force_unload(flags); |
1da177e4 LT |
986 | if (!forced) { |
987 | /* This module can't be removed */ | |
988 | ret = -EBUSY; | |
989 | goto out; | |
990 | } | |
991 | } | |
992 | ||
1da177e4 LT |
993 | /* Stop the machine so refcounts can't move and disable module. */ |
994 | ret = try_stop_module(mod, flags, &forced); | |
995 | if (ret != 0) | |
996 | goto out; | |
997 | ||
df4b565e | 998 | mutex_unlock(&module_mutex); |
25985edc | 999 | /* Final destruction now no one is using it. */ |
df4b565e | 1000 | if (mod->exit != NULL) |
1da177e4 | 1001 | mod->exit(); |
df4b565e PO |
1002 | blocking_notifier_call_chain(&module_notify_list, |
1003 | MODULE_STATE_GOING, mod); | |
22a9d645 | 1004 | async_synchronize_full(); |
75676500 | 1005 | |
e14af7ee | 1006 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1007 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1008 | |
75676500 RR |
1009 | free_module(mod); |
1010 | return 0; | |
1011 | out: | |
6389a385 | 1012 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1013 | return ret; |
1014 | } | |
1015 | ||
d1e99d7a | 1016 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1017 | { |
1018 | struct module_use *use; | |
1019 | int printed_something = 0; | |
1020 | ||
d5db139a | 1021 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1022 | |
6da0b565 IA |
1023 | /* |
1024 | * Always include a trailing , so userspace can differentiate | |
1025 | * between this and the old multi-field proc format. | |
1026 | */ | |
2c02dfe7 | 1027 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1028 | printed_something = 1; |
2c02dfe7 | 1029 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1030 | } |
1031 | ||
1da177e4 LT |
1032 | if (mod->init != NULL && mod->exit == NULL) { |
1033 | printed_something = 1; | |
6da0b565 | 1034 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | if (!printed_something) | |
6da0b565 | 1038 | seq_puts(m, "-"); |
1da177e4 LT |
1039 | } |
1040 | ||
1041 | void __symbol_put(const char *symbol) | |
1042 | { | |
1043 | struct module *owner; | |
1da177e4 | 1044 | |
24da1cbf | 1045 | preempt_disable(); |
414fd31b | 1046 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1047 | BUG(); |
1048 | module_put(owner); | |
24da1cbf | 1049 | preempt_enable(); |
1da177e4 LT |
1050 | } |
1051 | EXPORT_SYMBOL(__symbol_put); | |
1052 | ||
7d1d16e4 | 1053 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1054 | void symbol_put_addr(void *addr) |
1055 | { | |
5e376613 | 1056 | struct module *modaddr; |
7d1d16e4 | 1057 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1058 | |
7d1d16e4 | 1059 | if (core_kernel_text(a)) |
5e376613 | 1060 | return; |
1da177e4 | 1061 | |
a6e6abd5 RR |
1062 | /* module_text_address is safe here: we're supposed to have reference |
1063 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 1064 | modaddr = __module_text_address(a); |
a6e6abd5 | 1065 | BUG_ON(!modaddr); |
5e376613 | 1066 | module_put(modaddr); |
1da177e4 LT |
1067 | } |
1068 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1069 | ||
1070 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1071 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1072 | { |
d5db139a | 1073 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1074 | } |
1075 | ||
cca3e707 KS |
1076 | static struct module_attribute modinfo_refcnt = |
1077 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1078 | |
d53799be SR |
1079 | void __module_get(struct module *module) |
1080 | { | |
1081 | if (module) { | |
1082 | preempt_disable(); | |
2f35c41f | 1083 | atomic_inc(&module->refcnt); |
d53799be SR |
1084 | trace_module_get(module, _RET_IP_); |
1085 | preempt_enable(); | |
1086 | } | |
1087 | } | |
1088 | EXPORT_SYMBOL(__module_get); | |
1089 | ||
1090 | bool try_module_get(struct module *module) | |
1091 | { | |
1092 | bool ret = true; | |
1093 | ||
1094 | if (module) { | |
1095 | preempt_disable(); | |
e513cc1c MH |
1096 | /* Note: here, we can fail to get a reference */ |
1097 | if (likely(module_is_live(module) && | |
1098 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1099 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1100 | else |
d53799be SR |
1101 | ret = false; |
1102 | ||
1103 | preempt_enable(); | |
1104 | } | |
1105 | return ret; | |
1106 | } | |
1107 | EXPORT_SYMBOL(try_module_get); | |
1108 | ||
f6a57033 AV |
1109 | void module_put(struct module *module) |
1110 | { | |
e513cc1c MH |
1111 | int ret; |
1112 | ||
f6a57033 | 1113 | if (module) { |
e1783a24 | 1114 | preempt_disable(); |
e513cc1c MH |
1115 | ret = atomic_dec_if_positive(&module->refcnt); |
1116 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1117 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1118 | preempt_enable(); |
f6a57033 AV |
1119 | } |
1120 | } | |
1121 | EXPORT_SYMBOL(module_put); | |
1122 | ||
1da177e4 | 1123 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1124 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1125 | { |
1126 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1127 | seq_puts(m, " - -"); |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | static inline void module_unload_free(struct module *mod) | |
1131 | { | |
1132 | } | |
1133 | ||
9bea7f23 | 1134 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1135 | { |
9bea7f23 | 1136 | return strong_try_module_get(b); |
1da177e4 | 1137 | } |
9bea7f23 | 1138 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1139 | |
9f85a4bb | 1140 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1141 | { |
9f85a4bb | 1142 | return 0; |
1da177e4 LT |
1143 | } |
1144 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1145 | ||
53999bf3 KW |
1146 | static size_t module_flags_taint(struct module *mod, char *buf) |
1147 | { | |
1148 | size_t l = 0; | |
1149 | ||
1150 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) | |
1151 | buf[l++] = 'P'; | |
1152 | if (mod->taints & (1 << TAINT_OOT_MODULE)) | |
1153 | buf[l++] = 'O'; | |
1154 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) | |
1155 | buf[l++] = 'F'; | |
1156 | if (mod->taints & (1 << TAINT_CRAP)) | |
1157 | buf[l++] = 'C'; | |
66cc69e3 | 1158 | if (mod->taints & (1 << TAINT_UNSIGNED_MODULE)) |
57673c2b | 1159 | buf[l++] = 'E'; |
53999bf3 KW |
1160 | /* |
1161 | * TAINT_FORCED_RMMOD: could be added. | |
8c90487c | 1162 | * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
53999bf3 KW |
1163 | * apply to modules. |
1164 | */ | |
1165 | return l; | |
1166 | } | |
1167 | ||
1f71740a | 1168 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1169 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1170 | { |
1171 | const char *state = "unknown"; | |
1172 | ||
4befb026 | 1173 | switch (mk->mod->state) { |
1f71740a KS |
1174 | case MODULE_STATE_LIVE: |
1175 | state = "live"; | |
1176 | break; | |
1177 | case MODULE_STATE_COMING: | |
1178 | state = "coming"; | |
1179 | break; | |
1180 | case MODULE_STATE_GOING: | |
1181 | state = "going"; | |
1182 | break; | |
0d21b0e3 RR |
1183 | default: |
1184 | BUG(); | |
1f71740a KS |
1185 | } |
1186 | return sprintf(buffer, "%s\n", state); | |
1187 | } | |
1188 | ||
cca3e707 KS |
1189 | static struct module_attribute modinfo_initstate = |
1190 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1191 | |
88bfa324 KS |
1192 | static ssize_t store_uevent(struct module_attribute *mattr, |
1193 | struct module_kobject *mk, | |
1194 | const char *buffer, size_t count) | |
1195 | { | |
1196 | enum kobject_action action; | |
1197 | ||
1198 | if (kobject_action_type(buffer, count, &action) == 0) | |
1199 | kobject_uevent(&mk->kobj, action); | |
1200 | return count; | |
1201 | } | |
1202 | ||
cca3e707 KS |
1203 | struct module_attribute module_uevent = |
1204 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1205 | ||
1206 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1207 | struct module_kobject *mk, char *buffer) | |
1208 | { | |
1209 | return sprintf(buffer, "%u\n", mk->mod->core_size); | |
1210 | } | |
1211 | ||
1212 | static struct module_attribute modinfo_coresize = | |
1213 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1214 | ||
1215 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1216 | struct module_kobject *mk, char *buffer) | |
1217 | { | |
1218 | return sprintf(buffer, "%u\n", mk->mod->init_size); | |
1219 | } | |
1220 | ||
1221 | static struct module_attribute modinfo_initsize = | |
1222 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1223 | ||
1224 | static ssize_t show_taint(struct module_attribute *mattr, | |
1225 | struct module_kobject *mk, char *buffer) | |
1226 | { | |
1227 | size_t l; | |
1228 | ||
1229 | l = module_flags_taint(mk->mod, buffer); | |
1230 | buffer[l++] = '\n'; | |
1231 | return l; | |
1232 | } | |
1233 | ||
1234 | static struct module_attribute modinfo_taint = | |
1235 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1236 | |
03e88ae1 | 1237 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1238 | &module_uevent, |
03e88ae1 GKH |
1239 | &modinfo_version, |
1240 | &modinfo_srcversion, | |
cca3e707 KS |
1241 | &modinfo_initstate, |
1242 | &modinfo_coresize, | |
1243 | &modinfo_initsize, | |
1244 | &modinfo_taint, | |
03e88ae1 | 1245 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1246 | &modinfo_refcnt, |
03e88ae1 GKH |
1247 | #endif |
1248 | NULL, | |
1249 | }; | |
1250 | ||
1da177e4 LT |
1251 | static const char vermagic[] = VERMAGIC_STRING; |
1252 | ||
c6e665c8 | 1253 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1254 | { |
1255 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1256 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1257 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1258 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1259 | return 0; |
1260 | #else | |
1261 | return -ENOEXEC; | |
1262 | #endif | |
1263 | } | |
1264 | ||
1da177e4 | 1265 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
1266 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1267 | static unsigned long maybe_relocated(unsigned long crc, | |
1268 | const struct module *crc_owner) | |
1269 | { | |
1270 | #ifdef ARCH_RELOCATES_KCRCTAB | |
1271 | if (crc_owner == NULL) | |
1272 | return crc - (unsigned long)reloc_start; | |
1273 | #endif | |
1274 | return crc; | |
1275 | } | |
1276 | ||
1da177e4 LT |
1277 | static int check_version(Elf_Shdr *sechdrs, |
1278 | unsigned int versindex, | |
1279 | const char *symname, | |
6da0b565 | 1280 | struct module *mod, |
d4703aef RR |
1281 | const unsigned long *crc, |
1282 | const struct module *crc_owner) | |
1da177e4 LT |
1283 | { |
1284 | unsigned int i, num_versions; | |
1285 | struct modversion_info *versions; | |
1286 | ||
1287 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1288 | if (!crc) | |
1289 | return 1; | |
1290 | ||
a5dd6970 RR |
1291 | /* No versions at all? modprobe --force does this. */ |
1292 | if (versindex == 0) | |
1293 | return try_to_force_load(mod, symname) == 0; | |
1294 | ||
1da177e4 LT |
1295 | versions = (void *) sechdrs[versindex].sh_addr; |
1296 | num_versions = sechdrs[versindex].sh_size | |
1297 | / sizeof(struct modversion_info); | |
1298 | ||
1299 | for (i = 0; i < num_versions; i++) { | |
1300 | if (strcmp(versions[i].name, symname) != 0) | |
1301 | continue; | |
1302 | ||
d4703aef | 1303 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1304 | return 1; |
5e124169 | 1305 | pr_debug("Found checksum %lX vs module %lX\n", |
d4703aef | 1306 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1307 | goto bad_version; |
1da177e4 | 1308 | } |
826e4506 | 1309 | |
bddb12b3 | 1310 | pr_warn("%s: no symbol version for %s\n", mod->name, symname); |
a5dd6970 | 1311 | return 0; |
826e4506 LT |
1312 | |
1313 | bad_version: | |
6da0b565 | 1314 | pr_warn("%s: disagrees about version of symbol %s\n", |
826e4506 LT |
1315 | mod->name, symname); |
1316 | return 0; | |
1da177e4 LT |
1317 | } |
1318 | ||
1319 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1320 | unsigned int versindex, | |
1321 | struct module *mod) | |
1322 | { | |
1323 | const unsigned long *crc; | |
1da177e4 | 1324 | |
926a59b1 PZ |
1325 | /* |
1326 | * Since this should be found in kernel (which can't be removed), no | |
1327 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1328 | */ | |
1329 | preempt_disable(); | |
b92021b0 | 1330 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
926a59b1 PZ |
1331 | &crc, true, false)) { |
1332 | preempt_enable(); | |
1da177e4 | 1333 | BUG(); |
926a59b1 PZ |
1334 | } |
1335 | preempt_enable(); | |
a4b6a77b JH |
1336 | return check_version(sechdrs, versindex, |
1337 | VMLINUX_SYMBOL_STR(module_layout), mod, crc, | |
d4703aef | 1338 | NULL); |
1da177e4 LT |
1339 | } |
1340 | ||
91e37a79 RR |
1341 | /* First part is kernel version, which we ignore if module has crcs. */ |
1342 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1343 | bool has_crcs) | |
1da177e4 | 1344 | { |
91e37a79 RR |
1345 | if (has_crcs) { |
1346 | amagic += strcspn(amagic, " "); | |
1347 | bmagic += strcspn(bmagic, " "); | |
1348 | } | |
1da177e4 LT |
1349 | return strcmp(amagic, bmagic) == 0; |
1350 | } | |
1351 | #else | |
1352 | static inline int check_version(Elf_Shdr *sechdrs, | |
1353 | unsigned int versindex, | |
1354 | const char *symname, | |
6da0b565 | 1355 | struct module *mod, |
d4703aef RR |
1356 | const unsigned long *crc, |
1357 | const struct module *crc_owner) | |
1da177e4 LT |
1358 | { |
1359 | return 1; | |
1360 | } | |
1361 | ||
1362 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1363 | unsigned int versindex, | |
1364 | struct module *mod) | |
1365 | { | |
1366 | return 1; | |
1367 | } | |
1368 | ||
91e37a79 RR |
1369 | static inline int same_magic(const char *amagic, const char *bmagic, |
1370 | bool has_crcs) | |
1da177e4 LT |
1371 | { |
1372 | return strcmp(amagic, bmagic) == 0; | |
1373 | } | |
1374 | #endif /* CONFIG_MODVERSIONS */ | |
1375 | ||
75676500 | 1376 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1377 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1378 | const struct load_info *info, | |
414fd31b | 1379 | const char *name, |
9bea7f23 | 1380 | char ownername[]) |
1da177e4 LT |
1381 | { |
1382 | struct module *owner; | |
414fd31b | 1383 | const struct kernel_symbol *sym; |
1da177e4 | 1384 | const unsigned long *crc; |
9bea7f23 | 1385 | int err; |
1da177e4 | 1386 | |
d64810f5 PZ |
1387 | /* |
1388 | * The module_mutex should not be a heavily contended lock; | |
1389 | * if we get the occasional sleep here, we'll go an extra iteration | |
1390 | * in the wait_event_interruptible(), which is harmless. | |
1391 | */ | |
1392 | sched_annotate_sleep(); | |
75676500 | 1393 | mutex_lock(&module_mutex); |
414fd31b | 1394 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1395 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1396 | if (!sym) |
1397 | goto unlock; | |
1398 | ||
49668688 RR |
1399 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1400 | owner)) { | |
9bea7f23 RR |
1401 | sym = ERR_PTR(-EINVAL); |
1402 | goto getname; | |
1da177e4 | 1403 | } |
9bea7f23 RR |
1404 | |
1405 | err = ref_module(mod, owner); | |
1406 | if (err) { | |
1407 | sym = ERR_PTR(err); | |
1408 | goto getname; | |
1409 | } | |
1410 | ||
1411 | getname: | |
1412 | /* We must make copy under the lock if we failed to get ref. */ | |
1413 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1414 | unlock: | |
75676500 | 1415 | mutex_unlock(&module_mutex); |
218ce735 | 1416 | return sym; |
1da177e4 LT |
1417 | } |
1418 | ||
49668688 RR |
1419 | static const struct kernel_symbol * |
1420 | resolve_symbol_wait(struct module *mod, | |
1421 | const struct load_info *info, | |
1422 | const char *name) | |
9bea7f23 RR |
1423 | { |
1424 | const struct kernel_symbol *ksym; | |
49668688 | 1425 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1426 | |
1427 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1428 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1429 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1430 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1431 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1432 | mod->name, owner); | |
9bea7f23 RR |
1433 | } |
1434 | return ksym; | |
1435 | } | |
1436 | ||
1da177e4 LT |
1437 | /* |
1438 | * /sys/module/foo/sections stuff | |
1439 | * J. Corbet <corbet@lwn.net> | |
1440 | */ | |
8f6d0378 | 1441 | #ifdef CONFIG_SYSFS |
10b465aa | 1442 | |
8f6d0378 | 1443 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1444 | static inline bool sect_empty(const Elf_Shdr *sect) |
1445 | { | |
1446 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1447 | } | |
1448 | ||
6da0b565 | 1449 | struct module_sect_attr { |
a58730c4 RR |
1450 | struct module_attribute mattr; |
1451 | char *name; | |
1452 | unsigned long address; | |
1453 | }; | |
1454 | ||
6da0b565 | 1455 | struct module_sect_attrs { |
a58730c4 RR |
1456 | struct attribute_group grp; |
1457 | unsigned int nsections; | |
1458 | struct module_sect_attr attrs[0]; | |
1459 | }; | |
1460 | ||
1da177e4 | 1461 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1462 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1463 | { |
1464 | struct module_sect_attr *sattr = | |
1465 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1466 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1467 | } |
1468 | ||
04b1db9f IN |
1469 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1470 | { | |
a58730c4 | 1471 | unsigned int section; |
04b1db9f IN |
1472 | |
1473 | for (section = 0; section < sect_attrs->nsections; section++) | |
1474 | kfree(sect_attrs->attrs[section].name); | |
1475 | kfree(sect_attrs); | |
1476 | } | |
1477 | ||
8f6d0378 | 1478 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1479 | { |
1480 | unsigned int nloaded = 0, i, size[2]; | |
1481 | struct module_sect_attrs *sect_attrs; | |
1482 | struct module_sect_attr *sattr; | |
1483 | struct attribute **gattr; | |
22a8bdeb | 1484 | |
1da177e4 | 1485 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1486 | for (i = 0; i < info->hdr->e_shnum; i++) |
1487 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1488 | nloaded++; |
1489 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1490 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1491 | sizeof(sect_attrs->grp.attrs[0])); | |
1492 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1493 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1494 | if (sect_attrs == NULL) | |
1da177e4 LT |
1495 | return; |
1496 | ||
1497 | /* Setup section attributes. */ | |
1498 | sect_attrs->grp.name = "sections"; | |
1499 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1500 | ||
04b1db9f | 1501 | sect_attrs->nsections = 0; |
1da177e4 LT |
1502 | sattr = §_attrs->attrs[0]; |
1503 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1504 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1505 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1506 | if (sect_empty(sec)) | |
35dead42 | 1507 | continue; |
8f6d0378 RR |
1508 | sattr->address = sec->sh_addr; |
1509 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1510 | GFP_KERNEL); |
1511 | if (sattr->name == NULL) | |
1512 | goto out; | |
1513 | sect_attrs->nsections++; | |
361795b1 | 1514 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1515 | sattr->mattr.show = module_sect_show; |
1516 | sattr->mattr.store = NULL; | |
1517 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1518 | sattr->mattr.attr.mode = S_IRUGO; |
1519 | *(gattr++) = &(sattr++)->mattr.attr; | |
1520 | } | |
1521 | *gattr = NULL; | |
1522 | ||
1523 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1524 | goto out; | |
1525 | ||
1526 | mod->sect_attrs = sect_attrs; | |
1527 | return; | |
1528 | out: | |
04b1db9f | 1529 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1530 | } |
1531 | ||
1532 | static void remove_sect_attrs(struct module *mod) | |
1533 | { | |
1534 | if (mod->sect_attrs) { | |
1535 | sysfs_remove_group(&mod->mkobj.kobj, | |
1536 | &mod->sect_attrs->grp); | |
1537 | /* We are positive that no one is using any sect attrs | |
1538 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1539 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1540 | mod->sect_attrs = NULL; |
1541 | } | |
1542 | } | |
1543 | ||
6d760133 RM |
1544 | /* |
1545 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1546 | */ | |
1547 | ||
1548 | struct module_notes_attrs { | |
1549 | struct kobject *dir; | |
1550 | unsigned int notes; | |
1551 | struct bin_attribute attrs[0]; | |
1552 | }; | |
1553 | ||
2c3c8bea | 1554 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1555 | struct bin_attribute *bin_attr, |
1556 | char *buf, loff_t pos, size_t count) | |
1557 | { | |
1558 | /* | |
1559 | * The caller checked the pos and count against our size. | |
1560 | */ | |
1561 | memcpy(buf, bin_attr->private + pos, count); | |
1562 | return count; | |
1563 | } | |
1564 | ||
1565 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1566 | unsigned int i) | |
1567 | { | |
1568 | if (notes_attrs->dir) { | |
1569 | while (i-- > 0) | |
1570 | sysfs_remove_bin_file(notes_attrs->dir, | |
1571 | ¬es_attrs->attrs[i]); | |
e9432093 | 1572 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1573 | } |
1574 | kfree(notes_attrs); | |
1575 | } | |
1576 | ||
8f6d0378 | 1577 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1578 | { |
1579 | unsigned int notes, loaded, i; | |
1580 | struct module_notes_attrs *notes_attrs; | |
1581 | struct bin_attribute *nattr; | |
1582 | ||
ea6bff36 IM |
1583 | /* failed to create section attributes, so can't create notes */ |
1584 | if (!mod->sect_attrs) | |
1585 | return; | |
1586 | ||
6d760133 RM |
1587 | /* Count notes sections and allocate structures. */ |
1588 | notes = 0; | |
8f6d0378 RR |
1589 | for (i = 0; i < info->hdr->e_shnum; i++) |
1590 | if (!sect_empty(&info->sechdrs[i]) && | |
1591 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1592 | ++notes; |
1593 | ||
1594 | if (notes == 0) | |
1595 | return; | |
1596 | ||
1597 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1598 | + notes * sizeof(notes_attrs->attrs[0]), | |
1599 | GFP_KERNEL); | |
1600 | if (notes_attrs == NULL) | |
1601 | return; | |
1602 | ||
1603 | notes_attrs->notes = notes; | |
1604 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1605 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1606 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1607 | continue; |
8f6d0378 | 1608 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1609 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1610 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1611 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1612 | nattr->size = info->sechdrs[i].sh_size; |
1613 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1614 | nattr->read = module_notes_read; |
1615 | ++nattr; | |
1616 | } | |
1617 | ++loaded; | |
1618 | } | |
1619 | ||
4ff6abff | 1620 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1621 | if (!notes_attrs->dir) |
1622 | goto out; | |
1623 | ||
1624 | for (i = 0; i < notes; ++i) | |
1625 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1626 | ¬es_attrs->attrs[i])) | |
1627 | goto out; | |
1628 | ||
1629 | mod->notes_attrs = notes_attrs; | |
1630 | return; | |
1631 | ||
1632 | out: | |
1633 | free_notes_attrs(notes_attrs, i); | |
1634 | } | |
1635 | ||
1636 | static void remove_notes_attrs(struct module *mod) | |
1637 | { | |
1638 | if (mod->notes_attrs) | |
1639 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1640 | } | |
1641 | ||
1da177e4 | 1642 | #else |
04b1db9f | 1643 | |
8f6d0378 RR |
1644 | static inline void add_sect_attrs(struct module *mod, |
1645 | const struct load_info *info) | |
1da177e4 LT |
1646 | { |
1647 | } | |
1648 | ||
1649 | static inline void remove_sect_attrs(struct module *mod) | |
1650 | { | |
1651 | } | |
6d760133 | 1652 | |
8f6d0378 RR |
1653 | static inline void add_notes_attrs(struct module *mod, |
1654 | const struct load_info *info) | |
6d760133 RM |
1655 | { |
1656 | } | |
1657 | ||
1658 | static inline void remove_notes_attrs(struct module *mod) | |
1659 | { | |
1660 | } | |
8f6d0378 | 1661 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1662 | |
80a3d1bb RR |
1663 | static void add_usage_links(struct module *mod) |
1664 | { | |
1665 | #ifdef CONFIG_MODULE_UNLOAD | |
1666 | struct module_use *use; | |
1667 | int nowarn; | |
1668 | ||
75676500 | 1669 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1670 | list_for_each_entry(use, &mod->target_list, target_list) { |
1671 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1672 | &mod->mkobj.kobj, mod->name); | |
1673 | } | |
75676500 | 1674 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1675 | #endif |
1676 | } | |
1677 | ||
1678 | static void del_usage_links(struct module *mod) | |
1679 | { | |
1680 | #ifdef CONFIG_MODULE_UNLOAD | |
1681 | struct module_use *use; | |
1682 | ||
75676500 | 1683 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1684 | list_for_each_entry(use, &mod->target_list, target_list) |
1685 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1686 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1687 | #endif |
1688 | } | |
1689 | ||
6407ebb2 | 1690 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1691 | { |
1692 | struct module_attribute *attr; | |
03e88ae1 | 1693 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1694 | int error = 0; |
1695 | int i; | |
1696 | ||
03e88ae1 GKH |
1697 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1698 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1699 | GFP_KERNEL); | |
1700 | if (!mod->modinfo_attrs) | |
1701 | return -ENOMEM; | |
1702 | ||
1703 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1704 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1705 | if (!attr->test || | |
03e88ae1 GKH |
1706 | (attr->test && attr->test(mod))) { |
1707 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1708 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1709 | error = sysfs_create_file(&mod->mkobj.kobj, |
1710 | &temp_attr->attr); | |
03e88ae1 GKH |
1711 | ++temp_attr; |
1712 | } | |
c988d2b2 MD |
1713 | } |
1714 | return error; | |
1715 | } | |
1716 | ||
6407ebb2 | 1717 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1718 | { |
1719 | struct module_attribute *attr; | |
1720 | int i; | |
1721 | ||
03e88ae1 GKH |
1722 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1723 | /* pick a field to test for end of list */ | |
1724 | if (!attr->attr.name) | |
1725 | break; | |
6da0b565 | 1726 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1727 | if (attr->free) |
1728 | attr->free(mod); | |
c988d2b2 | 1729 | } |
03e88ae1 | 1730 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1731 | } |
1da177e4 | 1732 | |
942e4431 LZ |
1733 | static void mod_kobject_put(struct module *mod) |
1734 | { | |
1735 | DECLARE_COMPLETION_ONSTACK(c); | |
1736 | mod->mkobj.kobj_completion = &c; | |
1737 | kobject_put(&mod->mkobj.kobj); | |
1738 | wait_for_completion(&c); | |
1739 | } | |
1740 | ||
6407ebb2 | 1741 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1742 | { |
1743 | int err; | |
6494a93d | 1744 | struct kobject *kobj; |
1da177e4 | 1745 | |
823bccfc | 1746 | if (!module_sysfs_initialized) { |
bddb12b3 | 1747 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1748 | err = -EINVAL; |
1749 | goto out; | |
1750 | } | |
6494a93d GKH |
1751 | |
1752 | kobj = kset_find_obj(module_kset, mod->name); | |
1753 | if (kobj) { | |
bddb12b3 | 1754 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1755 | kobject_put(kobj); |
1756 | err = -EINVAL; | |
1757 | goto out; | |
1758 | } | |
1759 | ||
1da177e4 | 1760 | mod->mkobj.mod = mod; |
e17e0f51 | 1761 | |
ac3c8141 GKH |
1762 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1763 | mod->mkobj.kobj.kset = module_kset; | |
1764 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1765 | "%s", mod->name); | |
1766 | if (err) | |
942e4431 | 1767 | mod_kobject_put(mod); |
270a6c4c | 1768 | |
97c146ef | 1769 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1770 | out: |
1771 | return err; | |
1772 | } | |
1773 | ||
6407ebb2 | 1774 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1775 | const struct load_info *info, |
270a6c4c KS |
1776 | struct kernel_param *kparam, |
1777 | unsigned int num_params) | |
1778 | { | |
1779 | int err; | |
1780 | ||
80a3d1bb RR |
1781 | err = mod_sysfs_init(mod); |
1782 | if (err) | |
1783 | goto out; | |
1784 | ||
4ff6abff | 1785 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1786 | if (!mod->holders_dir) { |
1787 | err = -ENOMEM; | |
270a6c4c | 1788 | goto out_unreg; |
240936e1 | 1789 | } |
270a6c4c | 1790 | |
1da177e4 LT |
1791 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1792 | if (err) | |
270a6c4c | 1793 | goto out_unreg_holders; |
1da177e4 | 1794 | |
c988d2b2 MD |
1795 | err = module_add_modinfo_attrs(mod); |
1796 | if (err) | |
e17e0f51 | 1797 | goto out_unreg_param; |
c988d2b2 | 1798 | |
80a3d1bb | 1799 | add_usage_links(mod); |
8f6d0378 RR |
1800 | add_sect_attrs(mod, info); |
1801 | add_notes_attrs(mod, info); | |
80a3d1bb | 1802 | |
e17e0f51 | 1803 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1804 | return 0; |
1805 | ||
e17e0f51 KS |
1806 | out_unreg_param: |
1807 | module_param_sysfs_remove(mod); | |
270a6c4c | 1808 | out_unreg_holders: |
78a2d906 | 1809 | kobject_put(mod->holders_dir); |
270a6c4c | 1810 | out_unreg: |
942e4431 | 1811 | mod_kobject_put(mod); |
80a3d1bb | 1812 | out: |
1da177e4 LT |
1813 | return err; |
1814 | } | |
34e4e2fe DL |
1815 | |
1816 | static void mod_sysfs_fini(struct module *mod) | |
1817 | { | |
8f6d0378 RR |
1818 | remove_notes_attrs(mod); |
1819 | remove_sect_attrs(mod); | |
942e4431 | 1820 | mod_kobject_put(mod); |
34e4e2fe DL |
1821 | } |
1822 | ||
8f6d0378 | 1823 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1824 | |
8f6d0378 RR |
1825 | static int mod_sysfs_setup(struct module *mod, |
1826 | const struct load_info *info, | |
6407ebb2 RR |
1827 | struct kernel_param *kparam, |
1828 | unsigned int num_params) | |
1829 | { | |
1830 | return 0; | |
1831 | } | |
1832 | ||
34e4e2fe DL |
1833 | static void mod_sysfs_fini(struct module *mod) |
1834 | { | |
1835 | } | |
1836 | ||
36b0360d RR |
1837 | static void module_remove_modinfo_attrs(struct module *mod) |
1838 | { | |
1839 | } | |
1840 | ||
80a3d1bb RR |
1841 | static void del_usage_links(struct module *mod) |
1842 | { | |
1843 | } | |
1844 | ||
34e4e2fe | 1845 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1846 | |
36b0360d | 1847 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1848 | { |
80a3d1bb | 1849 | del_usage_links(mod); |
c988d2b2 | 1850 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1851 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1852 | kobject_put(mod->mkobj.drivers_dir); |
1853 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1854 | mod_sysfs_fini(mod); |
1da177e4 LT |
1855 | } |
1856 | ||
84e1c6bb MC |
1857 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1858 | /* | |
1859 | * LKM RO/NX protection: protect module's text/ro-data | |
1860 | * from modification and any data from execution. | |
1861 | */ | |
1862 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) | |
1863 | { | |
1864 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); | |
1865 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); | |
1866 | ||
1867 | if (end_pfn > begin_pfn) | |
1868 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1869 | } | |
1870 | ||
1871 | static void set_section_ro_nx(void *base, | |
1872 | unsigned long text_size, | |
1873 | unsigned long ro_size, | |
1874 | unsigned long total_size) | |
1875 | { | |
1876 | /* begin and end PFNs of the current subsection */ | |
1877 | unsigned long begin_pfn; | |
1878 | unsigned long end_pfn; | |
1879 | ||
1880 | /* | |
1881 | * Set RO for module text and RO-data: | |
1882 | * - Always protect first page. | |
1883 | * - Do not protect last partial page. | |
1884 | */ | |
1885 | if (ro_size > 0) | |
1886 | set_page_attributes(base, base + ro_size, set_memory_ro); | |
1887 | ||
1888 | /* | |
1889 | * Set NX permissions for module data: | |
1890 | * - Do not protect first partial page. | |
1891 | * - Always protect last page. | |
1892 | */ | |
1893 | if (total_size > text_size) { | |
1894 | begin_pfn = PFN_UP((unsigned long)base + text_size); | |
1895 | end_pfn = PFN_UP((unsigned long)base + total_size); | |
1896 | if (end_pfn > begin_pfn) | |
1897 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1898 | } | |
1899 | } | |
1900 | ||
01526ed0 JG |
1901 | static void unset_module_core_ro_nx(struct module *mod) |
1902 | { | |
1903 | set_page_attributes(mod->module_core + mod->core_text_size, | |
1904 | mod->module_core + mod->core_size, | |
1905 | set_memory_x); | |
1906 | set_page_attributes(mod->module_core, | |
1907 | mod->module_core + mod->core_ro_size, | |
1908 | set_memory_rw); | |
1909 | } | |
1910 | ||
1911 | static void unset_module_init_ro_nx(struct module *mod) | |
1912 | { | |
1913 | set_page_attributes(mod->module_init + mod->init_text_size, | |
1914 | mod->module_init + mod->init_size, | |
1915 | set_memory_x); | |
1916 | set_page_attributes(mod->module_init, | |
1917 | mod->module_init + mod->init_ro_size, | |
1918 | set_memory_rw); | |
84e1c6bb MC |
1919 | } |
1920 | ||
1921 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1922 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
1923 | { |
1924 | struct module *mod; | |
1925 | ||
1926 | mutex_lock(&module_mutex); | |
1927 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1928 | if (mod->state == MODULE_STATE_UNFORMED) |
1929 | continue; | |
84e1c6bb MC |
1930 | if ((mod->module_core) && (mod->core_text_size)) { |
1931 | set_page_attributes(mod->module_core, | |
1932 | mod->module_core + mod->core_text_size, | |
1933 | set_memory_rw); | |
1934 | } | |
1935 | if ((mod->module_init) && (mod->init_text_size)) { | |
1936 | set_page_attributes(mod->module_init, | |
1937 | mod->module_init + mod->init_text_size, | |
1938 | set_memory_rw); | |
1939 | } | |
1940 | } | |
1941 | mutex_unlock(&module_mutex); | |
1942 | } | |
1943 | ||
1944 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1945 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
1946 | { |
1947 | struct module *mod; | |
1948 | ||
1949 | mutex_lock(&module_mutex); | |
1950 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1951 | if (mod->state == MODULE_STATE_UNFORMED) |
1952 | continue; | |
84e1c6bb MC |
1953 | if ((mod->module_core) && (mod->core_text_size)) { |
1954 | set_page_attributes(mod->module_core, | |
1955 | mod->module_core + mod->core_text_size, | |
1956 | set_memory_ro); | |
1957 | } | |
1958 | if ((mod->module_init) && (mod->init_text_size)) { | |
1959 | set_page_attributes(mod->module_init, | |
1960 | mod->module_init + mod->init_text_size, | |
1961 | set_memory_ro); | |
1962 | } | |
1963 | } | |
1964 | mutex_unlock(&module_mutex); | |
1965 | } | |
1966 | #else | |
1967 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } | |
01526ed0 JG |
1968 | static void unset_module_core_ro_nx(struct module *mod) { } |
1969 | static void unset_module_init_ro_nx(struct module *mod) { } | |
84e1c6bb MC |
1970 | #endif |
1971 | ||
be1f221c | 1972 | void __weak module_memfree(void *module_region) |
74e08fcf JB |
1973 | { |
1974 | vfree(module_region); | |
1975 | } | |
1976 | ||
1977 | void __weak module_arch_cleanup(struct module *mod) | |
1978 | { | |
1979 | } | |
1980 | ||
d453cded RR |
1981 | void __weak module_arch_freeing_init(struct module *mod) |
1982 | { | |
1983 | } | |
1984 | ||
75676500 | 1985 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1986 | static void free_module(struct module *mod) |
1987 | { | |
7ead8b83 LZ |
1988 | trace_module_free(mod); |
1989 | ||
36b0360d | 1990 | mod_sysfs_teardown(mod); |
1da177e4 | 1991 | |
944a1fa0 RR |
1992 | /* We leave it in list to prevent duplicate loads, but make sure |
1993 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 1994 | mutex_lock(&module_mutex); |
944a1fa0 | 1995 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 1996 | mutex_unlock(&module_mutex); |
944a1fa0 | 1997 | |
b82bab4b JB |
1998 | /* Remove dynamic debug info */ |
1999 | ddebug_remove_module(mod->name); | |
2000 | ||
1da177e4 LT |
2001 | /* Arch-specific cleanup. */ |
2002 | module_arch_cleanup(mod); | |
2003 | ||
2004 | /* Module unload stuff */ | |
2005 | module_unload_free(mod); | |
2006 | ||
e180a6b7 RR |
2007 | /* Free any allocated parameters. */ |
2008 | destroy_params(mod->kp, mod->num_kp); | |
2009 | ||
944a1fa0 RR |
2010 | /* Now we can delete it from the lists */ |
2011 | mutex_lock(&module_mutex); | |
461e34ae MH |
2012 | /* Unlink carefully: kallsyms could be walking list. */ |
2013 | list_del_rcu(&mod->list); | |
93c2e105 | 2014 | mod_tree_remove(mod); |
0286b5ea | 2015 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2016 | module_bug_cleanup(mod); |
0be964be PZ |
2017 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
2018 | synchronize_sched(); | |
944a1fa0 RR |
2019 | mutex_unlock(&module_mutex); |
2020 | ||
1da177e4 | 2021 | /* This may be NULL, but that's OK */ |
01526ed0 | 2022 | unset_module_init_ro_nx(mod); |
d453cded | 2023 | module_arch_freeing_init(mod); |
be1f221c | 2024 | module_memfree(mod->module_init); |
1da177e4 | 2025 | kfree(mod->args); |
259354de | 2026 | percpu_modfree(mod); |
9f85a4bb | 2027 | |
35a9393c | 2028 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
fbb9ce95 IM |
2029 | lockdep_free_key_range(mod->module_core, mod->core_size); |
2030 | ||
1da177e4 | 2031 | /* Finally, free the core (containing the module structure) */ |
01526ed0 | 2032 | unset_module_core_ro_nx(mod); |
be1f221c | 2033 | module_memfree(mod->module_core); |
eb8cdec4 BS |
2034 | |
2035 | #ifdef CONFIG_MPU | |
2036 | update_protections(current->mm); | |
2037 | #endif | |
1da177e4 LT |
2038 | } |
2039 | ||
2040 | void *__symbol_get(const char *symbol) | |
2041 | { | |
2042 | struct module *owner; | |
414fd31b | 2043 | const struct kernel_symbol *sym; |
1da177e4 | 2044 | |
24da1cbf | 2045 | preempt_disable(); |
414fd31b TA |
2046 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2047 | if (sym && strong_try_module_get(owner)) | |
2048 | sym = NULL; | |
24da1cbf | 2049 | preempt_enable(); |
1da177e4 | 2050 | |
414fd31b | 2051 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
2052 | } |
2053 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2054 | ||
eea8b54d AN |
2055 | /* |
2056 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2057 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2058 | * |
2059 | * You must hold the module_mutex. | |
eea8b54d AN |
2060 | */ |
2061 | static int verify_export_symbols(struct module *mod) | |
2062 | { | |
b211104d | 2063 | unsigned int i; |
eea8b54d | 2064 | struct module *owner; |
b211104d RR |
2065 | const struct kernel_symbol *s; |
2066 | struct { | |
2067 | const struct kernel_symbol *sym; | |
2068 | unsigned int num; | |
2069 | } arr[] = { | |
2070 | { mod->syms, mod->num_syms }, | |
2071 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2072 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2073 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2074 | { mod->unused_syms, mod->num_unused_syms }, |
2075 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2076 | #endif |
b211104d | 2077 | }; |
eea8b54d | 2078 | |
b211104d RR |
2079 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2080 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 2081 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 2082 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
2083 | " (owned by %s)\n", |
2084 | mod->name, s->name, module_name(owner)); | |
2085 | return -ENOEXEC; | |
2086 | } | |
eea8b54d | 2087 | } |
b211104d RR |
2088 | } |
2089 | return 0; | |
eea8b54d AN |
2090 | } |
2091 | ||
9a4b9708 | 2092 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2093 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2094 | { | |
2095 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2096 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2097 | unsigned long secbase; |
49668688 | 2098 | unsigned int i; |
1da177e4 | 2099 | int ret = 0; |
414fd31b | 2100 | const struct kernel_symbol *ksym; |
1da177e4 | 2101 | |
49668688 RR |
2102 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2103 | const char *name = info->strtab + sym[i].st_name; | |
2104 | ||
1da177e4 LT |
2105 | switch (sym[i].st_shndx) { |
2106 | case SHN_COMMON: | |
80375980 JM |
2107 | /* Ignore common symbols */ |
2108 | if (!strncmp(name, "__gnu_lto", 9)) | |
2109 | break; | |
2110 | ||
1da177e4 LT |
2111 | /* We compiled with -fno-common. These are not |
2112 | supposed to happen. */ | |
5e124169 | 2113 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2114 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2115 | mod->name); |
2116 | ret = -ENOEXEC; | |
2117 | break; | |
2118 | ||
2119 | case SHN_ABS: | |
2120 | /* Don't need to do anything */ | |
5e124169 | 2121 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2122 | (long)sym[i].st_value); |
2123 | break; | |
2124 | ||
2125 | case SHN_UNDEF: | |
49668688 | 2126 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2127 | /* Ok if resolved. */ |
9bea7f23 | 2128 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 2129 | sym[i].st_value = ksym->value; |
1da177e4 | 2130 | break; |
414fd31b TA |
2131 | } |
2132 | ||
1da177e4 | 2133 | /* Ok if weak. */ |
9bea7f23 | 2134 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2135 | break; |
2136 | ||
bddb12b3 AM |
2137 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
2138 | mod->name, name, PTR_ERR(ksym)); | |
9bea7f23 | 2139 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
2140 | break; |
2141 | ||
2142 | default: | |
2143 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2144 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2145 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2146 | else |
49668688 | 2147 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2148 | sym[i].st_value += secbase; |
2149 | break; | |
2150 | } | |
2151 | } | |
2152 | ||
2153 | return ret; | |
2154 | } | |
2155 | ||
49668688 | 2156 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2157 | { |
2158 | unsigned int i; | |
2159 | int err = 0; | |
2160 | ||
2161 | /* Now do relocations. */ | |
49668688 RR |
2162 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2163 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2164 | |
2165 | /* Not a valid relocation section? */ | |
49668688 | 2166 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2167 | continue; |
2168 | ||
2169 | /* Don't bother with non-allocated sections */ | |
49668688 | 2170 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2171 | continue; |
2172 | ||
49668688 RR |
2173 | if (info->sechdrs[i].sh_type == SHT_REL) |
2174 | err = apply_relocate(info->sechdrs, info->strtab, | |
2175 | info->index.sym, i, mod); | |
2176 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2177 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2178 | info->index.sym, i, mod); | |
22e268eb RR |
2179 | if (err < 0) |
2180 | break; | |
2181 | } | |
2182 | return err; | |
2183 | } | |
2184 | ||
088af9a6 HD |
2185 | /* Additional bytes needed by arch in front of individual sections */ |
2186 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2187 | unsigned int section) | |
2188 | { | |
2189 | /* default implementation just returns zero */ | |
2190 | return 0; | |
2191 | } | |
2192 | ||
1da177e4 | 2193 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2194 | static long get_offset(struct module *mod, unsigned int *size, |
2195 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2196 | { |
2197 | long ret; | |
2198 | ||
088af9a6 | 2199 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2200 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2201 | *size = ret + sechdr->sh_size; | |
2202 | return ret; | |
2203 | } | |
2204 | ||
2205 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2206 | might -- code, read-only data, read-write data, small data. Tally | |
2207 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2208 | belongs in init. */ | |
49668688 | 2209 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2210 | { |
2211 | static unsigned long const masks[][2] = { | |
2212 | /* NOTE: all executable code must be the first section | |
2213 | * in this array; otherwise modify the text_size | |
2214 | * finder in the two loops below */ | |
2215 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2216 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
2217 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2218 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2219 | }; | |
2220 | unsigned int m, i; | |
2221 | ||
49668688 RR |
2222 | for (i = 0; i < info->hdr->e_shnum; i++) |
2223 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2224 | |
5e124169 | 2225 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2226 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2227 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2228 | Elf_Shdr *s = &info->sechdrs[i]; | |
2229 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2230 | |
2231 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2232 | || (s->sh_flags & masks[m][1]) | |
2233 | || s->sh_entsize != ~0UL | |
49668688 | 2234 | || strstarts(sname, ".init")) |
1da177e4 | 2235 | continue; |
088af9a6 | 2236 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
5e124169 | 2237 | pr_debug("\t%s\n", sname); |
1da177e4 | 2238 | } |
84e1c6bb MC |
2239 | switch (m) { |
2240 | case 0: /* executable */ | |
2241 | mod->core_size = debug_align(mod->core_size); | |
1da177e4 | 2242 | mod->core_text_size = mod->core_size; |
84e1c6bb MC |
2243 | break; |
2244 | case 1: /* RO: text and ro-data */ | |
2245 | mod->core_size = debug_align(mod->core_size); | |
2246 | mod->core_ro_size = mod->core_size; | |
2247 | break; | |
2248 | case 3: /* whole core */ | |
2249 | mod->core_size = debug_align(mod->core_size); | |
2250 | break; | |
2251 | } | |
1da177e4 LT |
2252 | } |
2253 | ||
5e124169 | 2254 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2255 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2256 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2257 | Elf_Shdr *s = &info->sechdrs[i]; | |
2258 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2259 | |
2260 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2261 | || (s->sh_flags & masks[m][1]) | |
2262 | || s->sh_entsize != ~0UL | |
49668688 | 2263 | || !strstarts(sname, ".init")) |
1da177e4 | 2264 | continue; |
088af9a6 | 2265 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 | 2266 | | INIT_OFFSET_MASK); |
5e124169 | 2267 | pr_debug("\t%s\n", sname); |
1da177e4 | 2268 | } |
84e1c6bb MC |
2269 | switch (m) { |
2270 | case 0: /* executable */ | |
2271 | mod->init_size = debug_align(mod->init_size); | |
1da177e4 | 2272 | mod->init_text_size = mod->init_size; |
84e1c6bb MC |
2273 | break; |
2274 | case 1: /* RO: text and ro-data */ | |
2275 | mod->init_size = debug_align(mod->init_size); | |
2276 | mod->init_ro_size = mod->init_size; | |
2277 | break; | |
2278 | case 3: /* whole init */ | |
2279 | mod->init_size = debug_align(mod->init_size); | |
2280 | break; | |
2281 | } | |
1da177e4 LT |
2282 | } |
2283 | } | |
2284 | ||
1da177e4 LT |
2285 | static void set_license(struct module *mod, const char *license) |
2286 | { | |
2287 | if (!license) | |
2288 | license = "unspecified"; | |
2289 | ||
fa3ba2e8 | 2290 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2291 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2292 | pr_warn("%s: module license '%s' taints kernel.\n", |
2293 | mod->name, license); | |
373d4d09 RR |
2294 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2295 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2296 | } |
2297 | } | |
2298 | ||
2299 | /* Parse tag=value strings from .modinfo section */ | |
2300 | static char *next_string(char *string, unsigned long *secsize) | |
2301 | { | |
2302 | /* Skip non-zero chars */ | |
2303 | while (string[0]) { | |
2304 | string++; | |
2305 | if ((*secsize)-- <= 1) | |
2306 | return NULL; | |
2307 | } | |
2308 | ||
2309 | /* Skip any zero padding. */ | |
2310 | while (!string[0]) { | |
2311 | string++; | |
2312 | if ((*secsize)-- <= 1) | |
2313 | return NULL; | |
2314 | } | |
2315 | return string; | |
2316 | } | |
2317 | ||
49668688 | 2318 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2319 | { |
2320 | char *p; | |
2321 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2322 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2323 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2324 | |
49668688 | 2325 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2326 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2327 | return p + taglen + 1; | |
2328 | } | |
2329 | return NULL; | |
2330 | } | |
2331 | ||
49668688 | 2332 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2333 | { |
2334 | struct module_attribute *attr; | |
2335 | int i; | |
2336 | ||
2337 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2338 | if (attr->setup) | |
49668688 | 2339 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2340 | } |
2341 | } | |
c988d2b2 | 2342 | |
a263f776 RR |
2343 | static void free_modinfo(struct module *mod) |
2344 | { | |
2345 | struct module_attribute *attr; | |
2346 | int i; | |
2347 | ||
2348 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2349 | if (attr->free) | |
2350 | attr->free(mod); | |
2351 | } | |
2352 | } | |
2353 | ||
1da177e4 | 2354 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2355 | |
2356 | /* lookup symbol in given range of kernel_symbols */ | |
2357 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2358 | const struct kernel_symbol *start, | |
2359 | const struct kernel_symbol *stop) | |
2360 | { | |
9d63487f AIB |
2361 | return bsearch(name, start, stop - start, |
2362 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2363 | } |
2364 | ||
ca4787b7 TA |
2365 | static int is_exported(const char *name, unsigned long value, |
2366 | const struct module *mod) | |
1da177e4 | 2367 | { |
ca4787b7 TA |
2368 | const struct kernel_symbol *ks; |
2369 | if (!mod) | |
2370 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2371 | else |
ca4787b7 TA |
2372 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2373 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2374 | } |
2375 | ||
2376 | /* As per nm */ | |
eded41c1 | 2377 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2378 | { |
eded41c1 RR |
2379 | const Elf_Shdr *sechdrs = info->sechdrs; |
2380 | ||
1da177e4 LT |
2381 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2382 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2383 | return 'v'; | |
2384 | else | |
2385 | return 'w'; | |
2386 | } | |
2387 | if (sym->st_shndx == SHN_UNDEF) | |
2388 | return 'U'; | |
2389 | if (sym->st_shndx == SHN_ABS) | |
2390 | return 'a'; | |
2391 | if (sym->st_shndx >= SHN_LORESERVE) | |
2392 | return '?'; | |
2393 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2394 | return 't'; | |
2395 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2396 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2397 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2398 | return 'r'; | |
2399 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2400 | return 'g'; | |
2401 | else | |
2402 | return 'd'; | |
2403 | } | |
2404 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2405 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2406 | return 's'; | |
2407 | else | |
2408 | return 'b'; | |
2409 | } | |
eded41c1 RR |
2410 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2411 | ".debug")) { | |
1da177e4 | 2412 | return 'n'; |
eded41c1 | 2413 | } |
1da177e4 LT |
2414 | return '?'; |
2415 | } | |
2416 | ||
4a496226 | 2417 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
6da0b565 | 2418 | unsigned int shnum) |
4a496226 JB |
2419 | { |
2420 | const Elf_Shdr *sec; | |
2421 | ||
2422 | if (src->st_shndx == SHN_UNDEF | |
2423 | || src->st_shndx >= shnum | |
2424 | || !src->st_name) | |
2425 | return false; | |
2426 | ||
2427 | sec = sechdrs + src->st_shndx; | |
2428 | if (!(sec->sh_flags & SHF_ALLOC) | |
2429 | #ifndef CONFIG_KALLSYMS_ALL | |
2430 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2431 | #endif | |
2432 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2433 | return false; | |
2434 | ||
2435 | return true; | |
2436 | } | |
2437 | ||
48fd1188 KC |
2438 | /* |
2439 | * We only allocate and copy the strings needed by the parts of symtab | |
2440 | * we keep. This is simple, but has the effect of making multiple | |
2441 | * copies of duplicates. We could be more sophisticated, see | |
2442 | * linux-kernel thread starting with | |
2443 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2444 | */ | |
49668688 | 2445 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2446 | { |
49668688 RR |
2447 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2448 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2449 | const Elf_Sym *src; |
54523ec7 | 2450 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2451 | |
2452 | /* Put symbol section at end of init part of module. */ | |
2453 | symsect->sh_flags |= SHF_ALLOC; | |
2454 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
49668688 | 2455 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2456 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2457 | |
49668688 | 2458 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2459 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2460 | |
48fd1188 | 2461 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 RR |
2462 | for (ndst = i = 0; i < nsrc; i++) { |
2463 | if (i == 0 || | |
2464 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2465 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; | |
48fd1188 | 2466 | ndst++; |
554bdfe5 | 2467 | } |
59ef28b1 | 2468 | } |
4a496226 JB |
2469 | |
2470 | /* Append room for core symbols at end of core part. */ | |
49668688 | 2471 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
48fd1188 KC |
2472 | info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
2473 | mod->core_size += strtab_size; | |
168e47f2 | 2474 | mod->core_size = debug_align(mod->core_size); |
4a496226 | 2475 | |
554bdfe5 JB |
2476 | /* Put string table section at end of init part of module. */ |
2477 | strsect->sh_flags |= SHF_ALLOC; | |
2478 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
49668688 | 2479 | info->index.str) | INIT_OFFSET_MASK; |
168e47f2 | 2480 | mod->init_size = debug_align(mod->init_size); |
5e124169 | 2481 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
4a496226 JB |
2482 | } |
2483 | ||
811d66a0 | 2484 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2485 | { |
4a496226 JB |
2486 | unsigned int i, ndst; |
2487 | const Elf_Sym *src; | |
2488 | Elf_Sym *dst; | |
554bdfe5 | 2489 | char *s; |
eded41c1 | 2490 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2491 | |
eded41c1 RR |
2492 | mod->symtab = (void *)symsec->sh_addr; |
2493 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae RR |
2494 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2495 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2496 | |
2497 | /* Set types up while we still have access to sections. */ | |
2498 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2499 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2500 | |
d913188c | 2501 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
48fd1188 | 2502 | mod->core_strtab = s = mod->module_core + info->stroffs; |
4a496226 | 2503 | src = mod->symtab; |
59ef28b1 RR |
2504 | for (ndst = i = 0; i < mod->num_symtab; i++) { |
2505 | if (i == 0 || | |
2506 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2507 | dst[ndst] = src[i]; | |
2508 | dst[ndst++].st_name = s - mod->core_strtab; | |
2509 | s += strlcpy(s, &mod->strtab[src[i].st_name], | |
2510 | KSYM_NAME_LEN) + 1; | |
2511 | } | |
4a496226 JB |
2512 | } |
2513 | mod->core_num_syms = ndst; | |
1da177e4 LT |
2514 | } |
2515 | #else | |
49668688 | 2516 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2517 | { |
2518 | } | |
3ae91c21 | 2519 | |
abbce906 | 2520 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2521 | { |
2522 | } | |
2523 | #endif /* CONFIG_KALLSYMS */ | |
2524 | ||
e9d376f0 | 2525 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2526 | { |
811d66a0 RR |
2527 | if (!debug) |
2528 | return; | |
e9d376f0 JB |
2529 | #ifdef CONFIG_DYNAMIC_DEBUG |
2530 | if (ddebug_add_module(debug, num, debug->modname)) | |
bddb12b3 AM |
2531 | pr_err("dynamic debug error adding module: %s\n", |
2532 | debug->modname); | |
e9d376f0 | 2533 | #endif |
5e458cc0 | 2534 | } |
346e15be | 2535 | |
ff49d74a YS |
2536 | static void dynamic_debug_remove(struct _ddebug *debug) |
2537 | { | |
2538 | if (debug) | |
2539 | ddebug_remove_module(debug->modname); | |
2540 | } | |
2541 | ||
74e08fcf JB |
2542 | void * __weak module_alloc(unsigned long size) |
2543 | { | |
82fab442 | 2544 | return vmalloc_exec(size); |
74e08fcf JB |
2545 | } |
2546 | ||
4f2294b6 | 2547 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2548 | static void kmemleak_load_module(const struct module *mod, |
2549 | const struct load_info *info) | |
4f2294b6 CM |
2550 | { |
2551 | unsigned int i; | |
2552 | ||
2553 | /* only scan the sections containing data */ | |
c017b4be | 2554 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2555 | |
49668688 | 2556 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2557 | /* Scan all writable sections that's not executable */ |
2558 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2559 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2560 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2561 | continue; |
2562 | ||
49668688 RR |
2563 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2564 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2565 | } |
2566 | } | |
2567 | #else | |
49668688 RR |
2568 | static inline void kmemleak_load_module(const struct module *mod, |
2569 | const struct load_info *info) | |
4f2294b6 CM |
2570 | { |
2571 | } | |
2572 | #endif | |
2573 | ||
106a4ee2 | 2574 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2575 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2576 | { |
2577 | int err = -ENOKEY; | |
34e1169d KC |
2578 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2579 | const void *mod = info->hdr; | |
caabe240 | 2580 | |
34e1169d KC |
2581 | if (info->len > markerlen && |
2582 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { | |
caabe240 | 2583 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2584 | info->len -= markerlen; |
2585 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2586 | } |
2587 | ||
2588 | if (!err) { | |
2589 | info->sig_ok = true; | |
2590 | return 0; | |
2591 | } | |
2592 | ||
2593 | /* Not having a signature is only an error if we're strict. */ | |
2594 | if (err == -ENOKEY && !sig_enforce) | |
2595 | err = 0; | |
2596 | ||
2597 | return err; | |
2598 | } | |
2599 | #else /* !CONFIG_MODULE_SIG */ | |
34e1169d | 2600 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2601 | { |
2602 | return 0; | |
2603 | } | |
2604 | #endif /* !CONFIG_MODULE_SIG */ | |
2605 | ||
34e1169d KC |
2606 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2607 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2608 | { |
34e1169d KC |
2609 | if (info->len < sizeof(*(info->hdr))) |
2610 | return -ENOEXEC; | |
2611 | ||
2612 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2613 | || info->hdr->e_type != ET_REL | |
2614 | || !elf_check_arch(info->hdr) | |
2615 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2616 | return -ENOEXEC; | |
2617 | ||
2618 | if (info->hdr->e_shoff >= info->len | |
2619 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2620 | info->len - info->hdr->e_shoff)) | |
2621 | return -ENOEXEC; | |
40dd2560 | 2622 | |
34e1169d KC |
2623 | return 0; |
2624 | } | |
2625 | ||
3afe9f84 LT |
2626 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2627 | ||
2628 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2629 | { | |
2630 | do { | |
2631 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2632 | ||
2633 | if (copy_from_user(dst, usrc, n) != 0) | |
2634 | return -EFAULT; | |
2635 | cond_resched(); | |
2636 | dst += n; | |
2637 | usrc += n; | |
2638 | len -= n; | |
2639 | } while (len); | |
2640 | return 0; | |
2641 | } | |
2642 | ||
34e1169d KC |
2643 | /* Sets info->hdr and info->len. */ |
2644 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2645 | struct load_info *info) | |
40dd2560 RR |
2646 | { |
2647 | int err; | |
40dd2560 | 2648 | |
34e1169d KC |
2649 | info->len = len; |
2650 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2651 | return -ENOEXEC; |
2652 | ||
2e72d51b KC |
2653 | err = security_kernel_module_from_file(NULL); |
2654 | if (err) | |
2655 | return err; | |
2656 | ||
40dd2560 | 2657 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d KS |
2658 | info->hdr = __vmalloc(info->len, |
2659 | GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN, PAGE_KERNEL); | |
34e1169d | 2660 | if (!info->hdr) |
40dd2560 RR |
2661 | return -ENOMEM; |
2662 | ||
3afe9f84 | 2663 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2664 | vfree(info->hdr); |
2665 | return -EFAULT; | |
40dd2560 RR |
2666 | } |
2667 | ||
34e1169d KC |
2668 | return 0; |
2669 | } | |
2670 | ||
2671 | /* Sets info->hdr and info->len. */ | |
2672 | static int copy_module_from_fd(int fd, struct load_info *info) | |
2673 | { | |
a2e0578b | 2674 | struct fd f = fdget(fd); |
34e1169d KC |
2675 | int err; |
2676 | struct kstat stat; | |
2677 | loff_t pos; | |
2678 | ssize_t bytes = 0; | |
2679 | ||
a2e0578b | 2680 | if (!f.file) |
34e1169d KC |
2681 | return -ENOEXEC; |
2682 | ||
a2e0578b | 2683 | err = security_kernel_module_from_file(f.file); |
106a4ee2 | 2684 | if (err) |
2e72d51b | 2685 | goto out; |
106a4ee2 | 2686 | |
a2e0578b | 2687 | err = vfs_getattr(&f.file->f_path, &stat); |
106a4ee2 | 2688 | if (err) |
34e1169d | 2689 | goto out; |
40dd2560 | 2690 | |
34e1169d KC |
2691 | if (stat.size > INT_MAX) { |
2692 | err = -EFBIG; | |
2693 | goto out; | |
40dd2560 | 2694 | } |
52441fa8 SL |
2695 | |
2696 | /* Don't hand 0 to vmalloc, it whines. */ | |
2697 | if (stat.size == 0) { | |
2698 | err = -EINVAL; | |
2699 | goto out; | |
2700 | } | |
2701 | ||
34e1169d KC |
2702 | info->hdr = vmalloc(stat.size); |
2703 | if (!info->hdr) { | |
2704 | err = -ENOMEM; | |
2705 | goto out; | |
40dd2560 | 2706 | } |
d913188c | 2707 | |
34e1169d KC |
2708 | pos = 0; |
2709 | while (pos < stat.size) { | |
a2e0578b | 2710 | bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos, |
34e1169d KC |
2711 | stat.size - pos); |
2712 | if (bytes < 0) { | |
2713 | vfree(info->hdr); | |
2714 | err = bytes; | |
2715 | goto out; | |
2716 | } | |
2717 | if (bytes == 0) | |
2718 | break; | |
2719 | pos += bytes; | |
2720 | } | |
2721 | info->len = pos; | |
40dd2560 | 2722 | |
34e1169d | 2723 | out: |
a2e0578b | 2724 | fdput(f); |
40dd2560 RR |
2725 | return err; |
2726 | } | |
2727 | ||
d913188c RR |
2728 | static void free_copy(struct load_info *info) |
2729 | { | |
d913188c RR |
2730 | vfree(info->hdr); |
2731 | } | |
2732 | ||
2f3238ae | 2733 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2734 | { |
2735 | unsigned int i; | |
2736 | ||
2737 | /* This should always be true, but let's be sure. */ | |
2738 | info->sechdrs[0].sh_addr = 0; | |
2739 | ||
2740 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2741 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2742 | if (shdr->sh_type != SHT_NOBITS | |
2743 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2744 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2745 | return -ENOEXEC; |
2746 | } | |
2747 | ||
2748 | /* Mark all sections sh_addr with their address in the | |
2749 | temporary image. */ | |
2750 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2751 | ||
2752 | #ifndef CONFIG_MODULE_UNLOAD | |
2753 | /* Don't load .exit sections */ | |
2754 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2755 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2756 | #endif | |
8b5f61a7 | 2757 | } |
d6df72a0 RR |
2758 | |
2759 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2760 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2761 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2762 | else | |
2763 | info->index.vers = find_sec(info, "__versions"); | |
49668688 | 2764 | info->index.info = find_sec(info, ".modinfo"); |
d6df72a0 RR |
2765 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2766 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2767 | return 0; |
2768 | } | |
2769 | ||
3264d3f9 LT |
2770 | /* |
2771 | * Set up our basic convenience variables (pointers to section headers, | |
2772 | * search for module section index etc), and do some basic section | |
2773 | * verification. | |
2774 | * | |
2775 | * Return the temporary module pointer (we'll replace it with the final | |
2776 | * one when we move the module sections around). | |
2777 | */ | |
2f3238ae | 2778 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2779 | { |
2780 | unsigned int i; | |
8b5f61a7 | 2781 | int err; |
3264d3f9 LT |
2782 | struct module *mod; |
2783 | ||
2784 | /* Set up the convenience variables */ | |
2785 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2786 | info->secstrings = (void *)info->hdr |
2787 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2788 | |
2f3238ae | 2789 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2790 | if (err) |
2791 | return ERR_PTR(err); | |
3264d3f9 | 2792 | |
8b5f61a7 RR |
2793 | /* Find internal symbols and strings. */ |
2794 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2795 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2796 | info->index.sym = i; | |
2797 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2798 | info->strtab = (char *)info->hdr |
2799 | + info->sechdrs[info->index.str].sh_offset; | |
2800 | break; | |
3264d3f9 | 2801 | } |
3264d3f9 LT |
2802 | } |
2803 | ||
49668688 | 2804 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2805 | if (!info->index.mod) { |
bddb12b3 | 2806 | pr_warn("No module found in object\n"); |
3264d3f9 LT |
2807 | return ERR_PTR(-ENOEXEC); |
2808 | } | |
2809 | /* This is temporary: point mod into copy of data. */ | |
2810 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2811 | ||
2812 | if (info->index.sym == 0) { | |
bddb12b3 | 2813 | pr_warn("%s: module has no symbols (stripped?)\n", mod->name); |
3264d3f9 LT |
2814 | return ERR_PTR(-ENOEXEC); |
2815 | } | |
2816 | ||
49668688 | 2817 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2818 | |
3264d3f9 LT |
2819 | /* Check module struct version now, before we try to use module. */ |
2820 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2821 | return ERR_PTR(-ENOEXEC); | |
2822 | ||
2823 | return mod; | |
3264d3f9 LT |
2824 | } |
2825 | ||
2f3238ae | 2826 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2827 | { |
49668688 | 2828 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2829 | int err; |
2830 | ||
2f3238ae RR |
2831 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2832 | modmagic = NULL; | |
2833 | ||
40dd2560 RR |
2834 | /* This is allowed: modprobe --force will invalidate it. */ |
2835 | if (!modmagic) { | |
2836 | err = try_to_force_load(mod, "bad vermagic"); | |
2837 | if (err) | |
2838 | return err; | |
49668688 | 2839 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 2840 | pr_err("%s: version magic '%s' should be '%s'\n", |
40dd2560 RR |
2841 | mod->name, modmagic, vermagic); |
2842 | return -ENOEXEC; | |
2843 | } | |
2844 | ||
2449b8ba | 2845 | if (!get_modinfo(info, "intree")) |
373d4d09 | 2846 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
2449b8ba | 2847 | |
49668688 | 2848 | if (get_modinfo(info, "staging")) { |
373d4d09 | 2849 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
2850 | pr_warn("%s: module is from the staging directory, the quality " |
2851 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 2852 | } |
22e268eb RR |
2853 | |
2854 | /* Set up license info based on the info section */ | |
49668688 | 2855 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2856 | |
40dd2560 RR |
2857 | return 0; |
2858 | } | |
2859 | ||
eb3057df | 2860 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2861 | { |
49668688 | 2862 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2863 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2864 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2865 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2866 | mod->crcs = section_addr(info, "__kcrctab"); |
2867 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2868 | sizeof(*mod->gpl_syms), |
2869 | &mod->num_gpl_syms); | |
49668688 RR |
2870 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2871 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2872 | "__ksymtab_gpl_future", |
2873 | sizeof(*mod->gpl_future_syms), | |
2874 | &mod->num_gpl_future_syms); | |
49668688 | 2875 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2876 | |
2877 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2878 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2879 | sizeof(*mod->unused_syms), |
2880 | &mod->num_unused_syms); | |
49668688 RR |
2881 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2882 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2883 | sizeof(*mod->unused_gpl_syms), |
2884 | &mod->num_unused_gpl_syms); | |
49668688 | 2885 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2886 | #endif |
2887 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2888 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 2889 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
2890 | if (!mod->ctors) |
2891 | mod->ctors = section_objs(info, ".init_array", | |
2892 | sizeof(*mod->ctors), &mod->num_ctors); | |
2893 | else if (find_sec(info, ".init_array")) { | |
2894 | /* | |
2895 | * This shouldn't happen with same compiler and binutils | |
2896 | * building all parts of the module. | |
2897 | */ | |
6da0b565 | 2898 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
2899 | mod->name); |
2900 | return -EINVAL; | |
2901 | } | |
f91a13bb LT |
2902 | #endif |
2903 | ||
2904 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2905 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2906 | sizeof(*mod->tracepoints_ptrs), | |
2907 | &mod->num_tracepoints); | |
f91a13bb | 2908 | #endif |
bf5438fc JB |
2909 | #ifdef HAVE_JUMP_LABEL |
2910 | mod->jump_entries = section_objs(info, "__jump_table", | |
2911 | sizeof(*mod->jump_entries), | |
2912 | &mod->num_jump_entries); | |
2913 | #endif | |
f91a13bb | 2914 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2915 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2916 | sizeof(*mod->trace_events), |
2917 | &mod->num_trace_events); | |
3673b8e4 SRRH |
2918 | mod->trace_enums = section_objs(info, "_ftrace_enum_map", |
2919 | sizeof(*mod->trace_enums), | |
2920 | &mod->num_trace_enums); | |
f91a13bb | 2921 | #endif |
13b9b6e7 SR |
2922 | #ifdef CONFIG_TRACING |
2923 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2924 | sizeof(*mod->trace_bprintk_fmt_start), | |
2925 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 2926 | #endif |
f91a13bb LT |
2927 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2928 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2929 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2930 | sizeof(*mod->ftrace_callsites), |
2931 | &mod->num_ftrace_callsites); | |
2932 | #endif | |
22e268eb | 2933 | |
811d66a0 RR |
2934 | mod->extable = section_objs(info, "__ex_table", |
2935 | sizeof(*mod->extable), &mod->num_exentries); | |
2936 | ||
49668688 | 2937 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 2938 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
2939 | |
2940 | info->debug = section_objs(info, "__verbose", | |
2941 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
2942 | |
2943 | return 0; | |
f91a13bb LT |
2944 | } |
2945 | ||
49668688 | 2946 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2947 | { |
2948 | int i; | |
2949 | void *ptr; | |
2950 | ||
2951 | /* Do the allocs. */ | |
4f666546 | 2952 | ptr = module_alloc(mod->core_size); |
65b8a9b4 LT |
2953 | /* |
2954 | * The pointer to this block is stored in the module structure | |
2955 | * which is inside the block. Just mark it as not being a | |
2956 | * leak. | |
2957 | */ | |
2958 | kmemleak_not_leak(ptr); | |
2959 | if (!ptr) | |
d913188c | 2960 | return -ENOMEM; |
65b8a9b4 LT |
2961 | |
2962 | memset(ptr, 0, mod->core_size); | |
2963 | mod->module_core = ptr; | |
2964 | ||
82fab442 | 2965 | if (mod->init_size) { |
4f666546 | 2966 | ptr = module_alloc(mod->init_size); |
82fab442 RR |
2967 | /* |
2968 | * The pointer to this block is stored in the module structure | |
2969 | * which is inside the block. This block doesn't need to be | |
2970 | * scanned as it contains data and code that will be freed | |
2971 | * after the module is initialized. | |
2972 | */ | |
2973 | kmemleak_ignore(ptr); | |
2974 | if (!ptr) { | |
be1f221c | 2975 | module_memfree(mod->module_core); |
82fab442 RR |
2976 | return -ENOMEM; |
2977 | } | |
2978 | memset(ptr, 0, mod->init_size); | |
2979 | mod->module_init = ptr; | |
2980 | } else | |
2981 | mod->module_init = NULL; | |
65b8a9b4 LT |
2982 | |
2983 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 2984 | pr_debug("final section addresses:\n"); |
49668688 | 2985 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2986 | void *dest; |
49668688 | 2987 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2988 | |
49668688 | 2989 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2990 | continue; |
2991 | ||
49668688 | 2992 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
65b8a9b4 | 2993 | dest = mod->module_init |
49668688 | 2994 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 2995 | else |
49668688 | 2996 | dest = mod->module_core + shdr->sh_entsize; |
65b8a9b4 | 2997 | |
49668688 RR |
2998 | if (shdr->sh_type != SHT_NOBITS) |
2999 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3000 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3001 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3002 | pr_debug("\t0x%lx %s\n", |
3003 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3004 | } |
d913188c RR |
3005 | |
3006 | return 0; | |
65b8a9b4 LT |
3007 | } |
3008 | ||
49668688 | 3009 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
3010 | { |
3011 | /* | |
3012 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3013 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3014 | * using GPL-only symbols it needs. | |
3015 | */ | |
3016 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3017 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3018 | |
3019 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3020 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3021 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3022 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3023 | |
c99af375 MG |
3024 | /* lve claims to be GPL but upstream won't provide source */ |
3025 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3026 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3027 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3028 | |
22e268eb RR |
3029 | #ifdef CONFIG_MODVERSIONS |
3030 | if ((mod->num_syms && !mod->crcs) | |
3031 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3032 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3033 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3034 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3035 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3036 | #endif | |
3037 | ) { | |
3038 | return try_to_force_load(mod, | |
3039 | "no versions for exported symbols"); | |
3040 | } | |
3041 | #endif | |
3042 | return 0; | |
3043 | } | |
3044 | ||
3045 | static void flush_module_icache(const struct module *mod) | |
3046 | { | |
3047 | mm_segment_t old_fs; | |
3048 | ||
3049 | /* flush the icache in correct context */ | |
3050 | old_fs = get_fs(); | |
3051 | set_fs(KERNEL_DS); | |
3052 | ||
3053 | /* | |
3054 | * Flush the instruction cache, since we've played with text. | |
3055 | * Do it before processing of module parameters, so the module | |
3056 | * can provide parameter accessor functions of its own. | |
3057 | */ | |
3058 | if (mod->module_init) | |
3059 | flush_icache_range((unsigned long)mod->module_init, | |
3060 | (unsigned long)mod->module_init | |
3061 | + mod->init_size); | |
3062 | flush_icache_range((unsigned long)mod->module_core, | |
3063 | (unsigned long)mod->module_core + mod->core_size); | |
3064 | ||
3065 | set_fs(old_fs); | |
3066 | } | |
3067 | ||
74e08fcf JB |
3068 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3069 | Elf_Shdr *sechdrs, | |
3070 | char *secstrings, | |
3071 | struct module *mod) | |
3072 | { | |
3073 | return 0; | |
3074 | } | |
3075 | ||
2f3238ae | 3076 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3077 | { |
d913188c | 3078 | /* Module within temporary copy. */ |
1da177e4 | 3079 | struct module *mod; |
d913188c | 3080 | int err; |
3ae91c21 | 3081 | |
2f3238ae | 3082 | mod = setup_load_info(info, flags); |
d913188c RR |
3083 | if (IS_ERR(mod)) |
3084 | return mod; | |
1da177e4 | 3085 | |
2f3238ae | 3086 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
3087 | if (err) |
3088 | return ERR_PTR(err); | |
1da177e4 | 3089 | |
1da177e4 | 3090 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
3091 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
3092 | info->secstrings, mod); | |
1da177e4 | 3093 | if (err < 0) |
8d8022e8 | 3094 | return ERR_PTR(err); |
1da177e4 | 3095 | |
8d8022e8 RR |
3096 | /* We will do a special allocation for per-cpu sections later. */ |
3097 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 LT |
3098 | |
3099 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
3100 | this is done generically; there doesn't appear to be any | |
3101 | special cases for the architectures. */ | |
49668688 | 3102 | layout_sections(mod, info); |
49668688 | 3103 | layout_symtab(mod, info); |
1da177e4 | 3104 | |
65b8a9b4 | 3105 | /* Allocate and move to the final place */ |
49668688 | 3106 | err = move_module(mod, info); |
d913188c | 3107 | if (err) |
8d8022e8 | 3108 | return ERR_PTR(err); |
d913188c RR |
3109 | |
3110 | /* Module has been copied to its final place now: return it. */ | |
3111 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3112 | kmemleak_load_module(mod, info); |
d913188c | 3113 | return mod; |
d913188c RR |
3114 | } |
3115 | ||
3116 | /* mod is no longer valid after this! */ | |
3117 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3118 | { | |
d913188c | 3119 | percpu_modfree(mod); |
d453cded | 3120 | module_arch_freeing_init(mod); |
be1f221c RR |
3121 | module_memfree(mod->module_init); |
3122 | module_memfree(mod->module_core); | |
d913188c RR |
3123 | } |
3124 | ||
74e08fcf JB |
3125 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3126 | const Elf_Shdr *sechdrs, | |
3127 | struct module *me) | |
3128 | { | |
3129 | return 0; | |
3130 | } | |
3131 | ||
811d66a0 RR |
3132 | static int post_relocation(struct module *mod, const struct load_info *info) |
3133 | { | |
51f3d0f4 | 3134 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3135 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3136 | ||
3137 | /* Copy relocated percpu area over. */ | |
3138 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3139 | info->sechdrs[info->index.pcpu].sh_size); | |
3140 | ||
51f3d0f4 | 3141 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3142 | add_kallsyms(mod, info); |
3143 | ||
3144 | /* Arch-specific module finalizing. */ | |
3145 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3146 | } | |
3147 | ||
9bb9c3be RR |
3148 | /* Is this module of this name done loading? No locks held. */ |
3149 | static bool finished_loading(const char *name) | |
3150 | { | |
3151 | struct module *mod; | |
3152 | bool ret; | |
3153 | ||
9cc019b8 PZ |
3154 | /* |
3155 | * The module_mutex should not be a heavily contended lock; | |
3156 | * if we get the occasional sleep here, we'll go an extra iteration | |
3157 | * in the wait_event_interruptible(), which is harmless. | |
3158 | */ | |
3159 | sched_annotate_sleep(); | |
9bb9c3be | 3160 | mutex_lock(&module_mutex); |
4f6de4d5 | 3161 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3162 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3163 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3164 | mutex_unlock(&module_mutex); |
3165 | ||
3166 | return ret; | |
3167 | } | |
3168 | ||
34e1169d KC |
3169 | /* Call module constructors. */ |
3170 | static void do_mod_ctors(struct module *mod) | |
3171 | { | |
3172 | #ifdef CONFIG_CONSTRUCTORS | |
3173 | unsigned long i; | |
3174 | ||
3175 | for (i = 0; i < mod->num_ctors; i++) | |
3176 | mod->ctors[i](); | |
3177 | #endif | |
3178 | } | |
3179 | ||
c7496379 RR |
3180 | /* For freeing module_init on success, in case kallsyms traversing */ |
3181 | struct mod_initfree { | |
3182 | struct rcu_head rcu; | |
3183 | void *module_init; | |
3184 | }; | |
3185 | ||
3186 | static void do_free_init(struct rcu_head *head) | |
3187 | { | |
3188 | struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); | |
3189 | module_memfree(m->module_init); | |
3190 | kfree(m); | |
3191 | } | |
3192 | ||
be02a186 JK |
3193 | /* |
3194 | * This is where the real work happens. | |
3195 | * | |
3196 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3197 | * helper command 'lx-symbols'. | |
3198 | */ | |
3199 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3200 | { |
3201 | int ret = 0; | |
c7496379 RR |
3202 | struct mod_initfree *freeinit; |
3203 | ||
3204 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3205 | if (!freeinit) { | |
3206 | ret = -ENOMEM; | |
3207 | goto fail; | |
3208 | } | |
3209 | freeinit->module_init = mod->module_init; | |
34e1169d | 3210 | |
774a1221 TH |
3211 | /* |
3212 | * We want to find out whether @mod uses async during init. Clear | |
3213 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3214 | */ | |
3215 | current->flags &= ~PF_USED_ASYNC; | |
3216 | ||
34e1169d KC |
3217 | do_mod_ctors(mod); |
3218 | /* Start the module */ | |
3219 | if (mod->init != NULL) | |
3220 | ret = do_one_initcall(mod->init); | |
3221 | if (ret < 0) { | |
c7496379 | 3222 | goto fail_free_freeinit; |
34e1169d KC |
3223 | } |
3224 | if (ret > 0) { | |
bddb12b3 AM |
3225 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3226 | "follow 0/-E convention\n" | |
3227 | "%s: loading module anyway...\n", | |
3228 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3229 | dump_stack(); |
3230 | } | |
3231 | ||
3232 | /* Now it's a first class citizen! */ | |
3233 | mod->state = MODULE_STATE_LIVE; | |
3234 | blocking_notifier_call_chain(&module_notify_list, | |
3235 | MODULE_STATE_LIVE, mod); | |
3236 | ||
774a1221 TH |
3237 | /* |
3238 | * We need to finish all async code before the module init sequence | |
3239 | * is done. This has potential to deadlock. For example, a newly | |
3240 | * detected block device can trigger request_module() of the | |
3241 | * default iosched from async probing task. Once userland helper | |
3242 | * reaches here, async_synchronize_full() will wait on the async | |
3243 | * task waiting on request_module() and deadlock. | |
3244 | * | |
3245 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3246 | * iff module init queued any async jobs. This isn't a full | |
3247 | * solution as it will deadlock the same if module loading from | |
3248 | * async jobs nests more than once; however, due to the various | |
3249 | * constraints, this hack seems to be the best option for now. | |
3250 | * Please refer to the following thread for details. | |
3251 | * | |
3252 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3253 | */ | |
3254 | if (current->flags & PF_USED_ASYNC) | |
3255 | async_synchronize_full(); | |
34e1169d KC |
3256 | |
3257 | mutex_lock(&module_mutex); | |
3258 | /* Drop initial reference. */ | |
3259 | module_put(mod); | |
3260 | trim_init_extable(mod); | |
3261 | #ifdef CONFIG_KALLSYMS | |
3262 | mod->num_symtab = mod->core_num_syms; | |
3263 | mod->symtab = mod->core_symtab; | |
3264 | mod->strtab = mod->core_strtab; | |
3265 | #endif | |
93c2e105 | 3266 | mod_tree_remove_init(mod); |
34e1169d | 3267 | unset_module_init_ro_nx(mod); |
d453cded | 3268 | module_arch_freeing_init(mod); |
34e1169d KC |
3269 | mod->module_init = NULL; |
3270 | mod->init_size = 0; | |
3271 | mod->init_ro_size = 0; | |
3272 | mod->init_text_size = 0; | |
c7496379 RR |
3273 | /* |
3274 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be PZ |
3275 | * walking this with preempt disabled. In all the failure paths, we |
3276 | * call synchronize_sched(), but we don't want to slow down the success | |
3277 | * path, so use actual RCU here. | |
c7496379 | 3278 | */ |
0be964be | 3279 | call_rcu_sched(&freeinit->rcu, do_free_init); |
34e1169d KC |
3280 | mutex_unlock(&module_mutex); |
3281 | wake_up_all(&module_wq); | |
3282 | ||
3283 | return 0; | |
c7496379 RR |
3284 | |
3285 | fail_free_freeinit: | |
3286 | kfree(freeinit); | |
3287 | fail: | |
3288 | /* Try to protect us from buggy refcounters. */ | |
3289 | mod->state = MODULE_STATE_GOING; | |
3290 | synchronize_sched(); | |
3291 | module_put(mod); | |
3292 | blocking_notifier_call_chain(&module_notify_list, | |
3293 | MODULE_STATE_GOING, mod); | |
3294 | free_module(mod); | |
3295 | wake_up_all(&module_wq); | |
3296 | return ret; | |
34e1169d KC |
3297 | } |
3298 | ||
3299 | static int may_init_module(void) | |
3300 | { | |
3301 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3302 | return -EPERM; | |
3303 | ||
3304 | return 0; | |
3305 | } | |
3306 | ||
a3535c7e RR |
3307 | /* |
3308 | * We try to place it in the list now to make sure it's unique before | |
3309 | * we dedicate too many resources. In particular, temporary percpu | |
3310 | * memory exhaustion. | |
3311 | */ | |
3312 | static int add_unformed_module(struct module *mod) | |
3313 | { | |
3314 | int err; | |
3315 | struct module *old; | |
3316 | ||
3317 | mod->state = MODULE_STATE_UNFORMED; | |
3318 | ||
3319 | again: | |
3320 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3321 | old = find_module_all(mod->name, strlen(mod->name), true); |
3322 | if (old != NULL) { | |
a3535c7e RR |
3323 | if (old->state == MODULE_STATE_COMING |
3324 | || old->state == MODULE_STATE_UNFORMED) { | |
3325 | /* Wait in case it fails to load. */ | |
3326 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3327 | err = wait_event_interruptible(module_wq, |
3328 | finished_loading(mod->name)); | |
a3535c7e RR |
3329 | if (err) |
3330 | goto out_unlocked; | |
3331 | goto again; | |
3332 | } | |
3333 | err = -EEXIST; | |
3334 | goto out; | |
3335 | } | |
4f666546 | 3336 | mod_update_bounds(mod); |
a3535c7e | 3337 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3338 | mod_tree_insert(mod); |
a3535c7e RR |
3339 | err = 0; |
3340 | ||
3341 | out: | |
3342 | mutex_unlock(&module_mutex); | |
3343 | out_unlocked: | |
3344 | return err; | |
3345 | } | |
3346 | ||
3347 | static int complete_formation(struct module *mod, struct load_info *info) | |
3348 | { | |
3349 | int err; | |
3350 | ||
3351 | mutex_lock(&module_mutex); | |
3352 | ||
3353 | /* Find duplicate symbols (must be called under lock). */ | |
3354 | err = verify_export_symbols(mod); | |
3355 | if (err < 0) | |
3356 | goto out; | |
3357 | ||
3358 | /* This relies on module_mutex for list integrity. */ | |
3359 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3360 | ||
4982223e RR |
3361 | /* Set RO and NX regions for core */ |
3362 | set_section_ro_nx(mod->module_core, | |
3363 | mod->core_text_size, | |
3364 | mod->core_ro_size, | |
3365 | mod->core_size); | |
3366 | ||
3367 | /* Set RO and NX regions for init */ | |
3368 | set_section_ro_nx(mod->module_init, | |
3369 | mod->init_text_size, | |
3370 | mod->init_ro_size, | |
3371 | mod->init_size); | |
3372 | ||
a3535c7e RR |
3373 | /* Mark state as coming so strong_try_module_get() ignores us, |
3374 | * but kallsyms etc. can see us. */ | |
3375 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3376 | mutex_unlock(&module_mutex); |
3377 | ||
3378 | blocking_notifier_call_chain(&module_notify_list, | |
3379 | MODULE_STATE_COMING, mod); | |
3380 | return 0; | |
a3535c7e RR |
3381 | |
3382 | out: | |
3383 | mutex_unlock(&module_mutex); | |
3384 | return err; | |
3385 | } | |
3386 | ||
54041d8a RR |
3387 | static int unknown_module_param_cb(char *param, char *val, const char *modname) |
3388 | { | |
6da0b565 | 3389 | /* Check for magic 'dyndbg' arg */ |
54041d8a | 3390 | int ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3391 | if (ret != 0) |
3392 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3393 | return 0; |
3394 | } | |
3395 | ||
d913188c RR |
3396 | /* Allocate and load the module: note that size of section 0 is always |
3397 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3398 | static int load_module(struct load_info *info, const char __user *uargs, |
3399 | int flags) | |
d913188c | 3400 | { |
a3535c7e | 3401 | struct module *mod; |
d913188c | 3402 | long err; |
51e158c1 | 3403 | char *after_dashes; |
d913188c | 3404 | |
34e1169d KC |
3405 | err = module_sig_check(info); |
3406 | if (err) | |
3407 | goto free_copy; | |
d913188c | 3408 | |
34e1169d | 3409 | err = elf_header_check(info); |
d913188c | 3410 | if (err) |
34e1169d | 3411 | goto free_copy; |
d913188c RR |
3412 | |
3413 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3414 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3415 | if (IS_ERR(mod)) { |
3416 | err = PTR_ERR(mod); | |
d913188c | 3417 | goto free_copy; |
1da177e4 | 3418 | } |
1da177e4 | 3419 | |
a3535c7e RR |
3420 | /* Reserve our place in the list. */ |
3421 | err = add_unformed_module(mod); | |
3422 | if (err) | |
1fb9341a | 3423 | goto free_module; |
1fb9341a | 3424 | |
106a4ee2 | 3425 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3426 | mod->sig_ok = info->sig_ok; |
64748a2c | 3427 | if (!mod->sig_ok) { |
bddb12b3 | 3428 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3429 | "and/or required key missing - tainting " |
bddb12b3 | 3430 | "kernel\n", mod->name); |
66cc69e3 | 3431 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3432 | } |
106a4ee2 RR |
3433 | #endif |
3434 | ||
8d8022e8 | 3435 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3436 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3437 | if (err) |
3438 | goto unlink_mod; | |
3439 | ||
49668688 | 3440 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3441 | err = module_unload_init(mod); |
3442 | if (err) | |
1fb9341a | 3443 | goto unlink_mod; |
1da177e4 | 3444 | |
b51d23e4 DS |
3445 | mutex_init(&mod->param_lock); |
3446 | ||
22e268eb RR |
3447 | /* Now we've got everything in the final locations, we can |
3448 | * find optional sections. */ | |
eb3057df FH |
3449 | err = find_module_sections(mod, info); |
3450 | if (err) | |
3451 | goto free_unload; | |
9b37ccfc | 3452 | |
49668688 | 3453 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3454 | if (err) |
3455 | goto free_unload; | |
9841d61d | 3456 | |
c988d2b2 | 3457 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3458 | setup_modinfo(mod, info); |
c988d2b2 | 3459 | |
1da177e4 | 3460 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3461 | err = simplify_symbols(mod, info); |
1da177e4 | 3462 | if (err < 0) |
d913188c | 3463 | goto free_modinfo; |
1da177e4 | 3464 | |
34e1169d | 3465 | err = apply_relocations(mod, info); |
22e268eb | 3466 | if (err < 0) |
d913188c | 3467 | goto free_modinfo; |
1da177e4 | 3468 | |
34e1169d | 3469 | err = post_relocation(mod, info); |
1da177e4 | 3470 | if (err < 0) |
d913188c | 3471 | goto free_modinfo; |
1da177e4 | 3472 | |
22e268eb | 3473 | flush_module_icache(mod); |
378bac82 | 3474 | |
6526c534 RR |
3475 | /* Now copy in args */ |
3476 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3477 | if (IS_ERR(mod->args)) { | |
3478 | err = PTR_ERR(mod->args); | |
3479 | goto free_arch_cleanup; | |
3480 | } | |
8d3b33f6 | 3481 | |
34e1169d | 3482 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3483 | |
a949ae56 SRRH |
3484 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3485 | ftrace_module_init(mod); | |
3486 | ||
a3535c7e RR |
3487 | /* Finally it's fully formed, ready to start executing. */ |
3488 | err = complete_formation(mod, info); | |
3489 | if (err) | |
1fb9341a | 3490 | goto ddebug_cleanup; |
be593f4c | 3491 | |
51f3d0f4 | 3492 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 RR |
3493 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
3494 | -32768, 32767, unknown_module_param_cb); | |
3495 | if (IS_ERR(after_dashes)) { | |
3496 | err = PTR_ERR(after_dashes); | |
1fb9341a | 3497 | goto bug_cleanup; |
51e158c1 RR |
3498 | } else if (after_dashes) { |
3499 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3500 | mod->name, after_dashes); | |
3501 | } | |
1da177e4 | 3502 | |
51f3d0f4 | 3503 | /* Link in to syfs. */ |
34e1169d | 3504 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3505 | if (err < 0) |
1fb9341a | 3506 | goto bug_cleanup; |
80a3d1bb | 3507 | |
48fd1188 | 3508 | /* Get rid of temporary copy. */ |
34e1169d | 3509 | free_copy(info); |
1da177e4 LT |
3510 | |
3511 | /* Done! */ | |
51f3d0f4 | 3512 | trace_module_load(mod); |
34e1169d KC |
3513 | |
3514 | return do_init_module(mod); | |
1da177e4 | 3515 | |
1fb9341a RR |
3516 | bug_cleanup: |
3517 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3518 | mutex_lock(&module_mutex); |
5336377d | 3519 | module_bug_cleanup(mod); |
ee61abb3 | 3520 | mutex_unlock(&module_mutex); |
ff7e0055 AL |
3521 | |
3522 | /* we can't deallocate the module until we clear memory protection */ | |
3523 | unset_module_init_ro_nx(mod); | |
3524 | unset_module_core_ro_nx(mod); | |
3525 | ||
a3535c7e | 3526 | ddebug_cleanup: |
1fb9341a | 3527 | dynamic_debug_remove(info->debug); |
e91defa2 | 3528 | synchronize_sched(); |
6526c534 RR |
3529 | kfree(mod->args); |
3530 | free_arch_cleanup: | |
1da177e4 | 3531 | module_arch_cleanup(mod); |
d913188c | 3532 | free_modinfo: |
a263f776 | 3533 | free_modinfo(mod); |
22e268eb | 3534 | free_unload: |
1da177e4 | 3535 | module_unload_free(mod); |
1fb9341a RR |
3536 | unlink_mod: |
3537 | mutex_lock(&module_mutex); | |
3538 | /* Unlink carefully: kallsyms could be walking list. */ | |
3539 | list_del_rcu(&mod->list); | |
3540 | wake_up_all(&module_wq); | |
0be964be PZ |
3541 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
3542 | synchronize_sched(); | |
1fb9341a | 3543 | mutex_unlock(&module_mutex); |
d913188c | 3544 | free_module: |
35a9393c PZ |
3545 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
3546 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
3547 | ||
34e1169d | 3548 | module_deallocate(mod, info); |
d913188c | 3549 | free_copy: |
34e1169d KC |
3550 | free_copy(info); |
3551 | return err; | |
b99b87f7 PO |
3552 | } |
3553 | ||
17da2bd9 HC |
3554 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3555 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3556 | { |
34e1169d KC |
3557 | int err; |
3558 | struct load_info info = { }; | |
1da177e4 | 3559 | |
34e1169d KC |
3560 | err = may_init_module(); |
3561 | if (err) | |
3562 | return err; | |
1da177e4 | 3563 | |
34e1169d KC |
3564 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3565 | umod, len, uargs); | |
1da177e4 | 3566 | |
34e1169d KC |
3567 | err = copy_module_from_user(umod, len, &info); |
3568 | if (err) | |
3569 | return err; | |
1da177e4 | 3570 | |
2f3238ae | 3571 | return load_module(&info, uargs, 0); |
34e1169d | 3572 | } |
94462ad3 | 3573 | |
2f3238ae | 3574 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d KC |
3575 | { |
3576 | int err; | |
3577 | struct load_info info = { }; | |
94462ad3 | 3578 | |
34e1169d KC |
3579 | err = may_init_module(); |
3580 | if (err) | |
3581 | return err; | |
1da177e4 | 3582 | |
2f3238ae | 3583 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3584 | |
2f3238ae RR |
3585 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3586 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3587 | return -EINVAL; | |
d6de2c80 | 3588 | |
34e1169d KC |
3589 | err = copy_module_from_fd(fd, &info); |
3590 | if (err) | |
3591 | return err; | |
1da177e4 | 3592 | |
2f3238ae | 3593 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3594 | } |
3595 | ||
3596 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3597 | { | |
3598 | return ((void *)addr >= start && (void *)addr < start + size); | |
3599 | } | |
3600 | ||
3601 | #ifdef CONFIG_KALLSYMS | |
3602 | /* | |
3603 | * This ignores the intensely annoying "mapping symbols" found | |
3604 | * in ARM ELF files: $a, $t and $d. | |
3605 | */ | |
3606 | static inline int is_arm_mapping_symbol(const char *str) | |
3607 | { | |
2e3a10a1 RK |
3608 | if (str[0] == '.' && str[1] == 'L') |
3609 | return true; | |
6c34f1f5 | 3610 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3611 | && (str[2] == '\0' || str[2] == '.'); |
3612 | } | |
3613 | ||
3614 | static const char *get_ksymbol(struct module *mod, | |
3615 | unsigned long addr, | |
3616 | unsigned long *size, | |
3617 | unsigned long *offset) | |
3618 | { | |
3619 | unsigned int i, best = 0; | |
3620 | unsigned long nextval; | |
3621 | ||
3622 | /* At worse, next value is at end of module */ | |
a06f6211 | 3623 | if (within_module_init(addr, mod)) |
1da177e4 | 3624 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 3625 | else |
1da177e4 LT |
3626 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
3627 | ||
25985edc | 3628 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3629 | starts real symbols at 1). */ |
1da177e4 LT |
3630 | for (i = 1; i < mod->num_symtab; i++) { |
3631 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
3632 | continue; | |
3633 | ||
3634 | /* We ignore unnamed symbols: they're uninformative | |
3635 | * and inserted at a whim. */ | |
3636 | if (mod->symtab[i].st_value <= addr | |
3637 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
3638 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3639 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3640 | best = i; | |
3641 | if (mod->symtab[i].st_value > addr | |
3642 | && mod->symtab[i].st_value < nextval | |
3643 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3644 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3645 | nextval = mod->symtab[i].st_value; | |
3646 | } | |
3647 | ||
3648 | if (!best) | |
3649 | return NULL; | |
3650 | ||
ffb45122 AD |
3651 | if (size) |
3652 | *size = nextval - mod->symtab[best].st_value; | |
3653 | if (offset) | |
3654 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
3655 | return mod->strtab + mod->symtab[best].st_name; |
3656 | } | |
3657 | ||
6dd06c9f RR |
3658 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3659 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3660 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3661 | unsigned long *size, |
3662 | unsigned long *offset, | |
3663 | char **modname, | |
3664 | char *namebuf) | |
1da177e4 | 3665 | { |
cb2a5205 | 3666 | const char *ret = NULL; |
b7df4d1b | 3667 | struct module *mod; |
1da177e4 | 3668 | |
cb2a5205 | 3669 | preempt_disable(); |
b7df4d1b PZ |
3670 | mod = __module_address(addr); |
3671 | if (mod) { | |
3672 | if (modname) | |
3673 | *modname = mod->name; | |
3674 | ret = get_ksymbol(mod, addr, size, offset); | |
1da177e4 | 3675 | } |
6dd06c9f RR |
3676 | /* Make a copy in here where it's safe */ |
3677 | if (ret) { | |
3678 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3679 | ret = namebuf; | |
3680 | } | |
cb2a5205 | 3681 | preempt_enable(); |
b7df4d1b | 3682 | |
92dfc9dc | 3683 | return ret; |
1da177e4 LT |
3684 | } |
3685 | ||
9d65cb4a AD |
3686 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3687 | { | |
3688 | struct module *mod; | |
3689 | ||
cb2a5205 | 3690 | preempt_disable(); |
d72b3751 | 3691 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3692 | if (mod->state == MODULE_STATE_UNFORMED) |
3693 | continue; | |
9b20a352 | 3694 | if (within_module(addr, mod)) { |
9d65cb4a AD |
3695 | const char *sym; |
3696 | ||
3697 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3698 | if (!sym) | |
3699 | goto out; | |
9281acea | 3700 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3701 | preempt_enable(); |
9d65cb4a AD |
3702 | return 0; |
3703 | } | |
3704 | } | |
3705 | out: | |
cb2a5205 | 3706 | preempt_enable(); |
9d65cb4a AD |
3707 | return -ERANGE; |
3708 | } | |
3709 | ||
a5c43dae AD |
3710 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3711 | unsigned long *offset, char *modname, char *name) | |
3712 | { | |
3713 | struct module *mod; | |
3714 | ||
cb2a5205 | 3715 | preempt_disable(); |
d72b3751 | 3716 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3717 | if (mod->state == MODULE_STATE_UNFORMED) |
3718 | continue; | |
9b20a352 | 3719 | if (within_module(addr, mod)) { |
a5c43dae AD |
3720 | const char *sym; |
3721 | ||
3722 | sym = get_ksymbol(mod, addr, size, offset); | |
3723 | if (!sym) | |
3724 | goto out; | |
3725 | if (modname) | |
9281acea | 3726 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3727 | if (name) |
9281acea | 3728 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3729 | preempt_enable(); |
a5c43dae AD |
3730 | return 0; |
3731 | } | |
3732 | } | |
3733 | out: | |
cb2a5205 | 3734 | preempt_enable(); |
a5c43dae AD |
3735 | return -ERANGE; |
3736 | } | |
3737 | ||
ea07890a AD |
3738 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3739 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3740 | { |
3741 | struct module *mod; | |
3742 | ||
cb2a5205 | 3743 | preempt_disable(); |
d72b3751 | 3744 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3745 | if (mod->state == MODULE_STATE_UNFORMED) |
3746 | continue; | |
1da177e4 LT |
3747 | if (symnum < mod->num_symtab) { |
3748 | *value = mod->symtab[symnum].st_value; | |
3749 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 3750 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
3751 | KSYM_NAME_LEN); |
3752 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 3753 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3754 | preempt_enable(); |
ea07890a | 3755 | return 0; |
1da177e4 LT |
3756 | } |
3757 | symnum -= mod->num_symtab; | |
3758 | } | |
cb2a5205 | 3759 | preempt_enable(); |
ea07890a | 3760 | return -ERANGE; |
1da177e4 LT |
3761 | } |
3762 | ||
3763 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3764 | { | |
3765 | unsigned int i; | |
3766 | ||
3767 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
3768 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3769 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
3770 | return mod->symtab[i].st_value; |
3771 | return 0; | |
3772 | } | |
3773 | ||
3774 | /* Look for this name: can be of form module:name. */ | |
3775 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3776 | { | |
3777 | struct module *mod; | |
3778 | char *colon; | |
3779 | unsigned long ret = 0; | |
3780 | ||
3781 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3782 | preempt_disable(); |
1da177e4 | 3783 | if ((colon = strchr(name, ':')) != NULL) { |
4f6de4d5 | 3784 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 3785 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 3786 | } else { |
0d21b0e3 RR |
3787 | list_for_each_entry_rcu(mod, &modules, list) { |
3788 | if (mod->state == MODULE_STATE_UNFORMED) | |
3789 | continue; | |
1da177e4 LT |
3790 | if ((ret = mod_find_symname(mod, name)) != 0) |
3791 | break; | |
0d21b0e3 | 3792 | } |
1da177e4 | 3793 | } |
cb2a5205 | 3794 | preempt_enable(); |
1da177e4 LT |
3795 | return ret; |
3796 | } | |
75a66614 AK |
3797 | |
3798 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3799 | struct module *, unsigned long), | |
3800 | void *data) | |
3801 | { | |
3802 | struct module *mod; | |
3803 | unsigned int i; | |
3804 | int ret; | |
3805 | ||
0be964be PZ |
3806 | module_assert_mutex(); |
3807 | ||
75a66614 | 3808 | list_for_each_entry(mod, &modules, list) { |
0d21b0e3 RR |
3809 | if (mod->state == MODULE_STATE_UNFORMED) |
3810 | continue; | |
75a66614 AK |
3811 | for (i = 0; i < mod->num_symtab; i++) { |
3812 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3813 | mod, mod->symtab[i].st_value); | |
3814 | if (ret != 0) | |
3815 | return ret; | |
3816 | } | |
3817 | } | |
3818 | return 0; | |
3819 | } | |
1da177e4 LT |
3820 | #endif /* CONFIG_KALLSYMS */ |
3821 | ||
21aa9280 | 3822 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3823 | { |
3824 | int bx = 0; | |
3825 | ||
0d21b0e3 | 3826 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
3827 | if (mod->taints || |
3828 | mod->state == MODULE_STATE_GOING || | |
3829 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3830 | buf[bx++] = '('; |
cca3e707 | 3831 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
3832 | /* Show a - for module-is-being-unloaded */ |
3833 | if (mod->state == MODULE_STATE_GOING) | |
3834 | buf[bx++] = '-'; | |
3835 | /* Show a + for module-is-being-loaded */ | |
3836 | if (mod->state == MODULE_STATE_COMING) | |
3837 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3838 | buf[bx++] = ')'; |
3839 | } | |
3840 | buf[bx] = '\0'; | |
3841 | ||
3842 | return buf; | |
3843 | } | |
3844 | ||
3b5d5c6b AD |
3845 | #ifdef CONFIG_PROC_FS |
3846 | /* Called by the /proc file system to return a list of modules. */ | |
3847 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3848 | { | |
3849 | mutex_lock(&module_mutex); | |
3850 | return seq_list_start(&modules, *pos); | |
3851 | } | |
3852 | ||
3853 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3854 | { | |
3855 | return seq_list_next(p, &modules, pos); | |
3856 | } | |
3857 | ||
3858 | static void m_stop(struct seq_file *m, void *p) | |
3859 | { | |
3860 | mutex_unlock(&module_mutex); | |
3861 | } | |
3862 | ||
1da177e4 LT |
3863 | static int m_show(struct seq_file *m, void *p) |
3864 | { | |
3865 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3866 | char buf[8]; |
3867 | ||
0d21b0e3 RR |
3868 | /* We always ignore unformed modules. */ |
3869 | if (mod->state == MODULE_STATE_UNFORMED) | |
3870 | return 0; | |
3871 | ||
2f0f2a33 | 3872 | seq_printf(m, "%s %u", |
1da177e4 LT |
3873 | mod->name, mod->init_size + mod->core_size); |
3874 | print_unload_info(m, mod); | |
3875 | ||
3876 | /* Informative for users. */ | |
3877 | seq_printf(m, " %s", | |
6da0b565 IA |
3878 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
3879 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
3880 | "Live"); |
3881 | /* Used by oprofile and other similar tools. */ | |
9f36e2c4 | 3882 | seq_printf(m, " 0x%pK", mod->module_core); |
1da177e4 | 3883 | |
fa3ba2e8 FM |
3884 | /* Taints info */ |
3885 | if (mod->taints) | |
21aa9280 | 3886 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3887 | |
6da0b565 | 3888 | seq_puts(m, "\n"); |
1da177e4 LT |
3889 | return 0; |
3890 | } | |
3891 | ||
3892 | /* Format: modulename size refcount deps address | |
3893 | ||
3894 | Where refcount is a number or -, and deps is a comma-separated list | |
3895 | of depends or -. | |
3896 | */ | |
3b5d5c6b | 3897 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3898 | .start = m_start, |
3899 | .next = m_next, | |
3900 | .stop = m_stop, | |
3901 | .show = m_show | |
3902 | }; | |
3903 | ||
3b5d5c6b AD |
3904 | static int modules_open(struct inode *inode, struct file *file) |
3905 | { | |
3906 | return seq_open(file, &modules_op); | |
3907 | } | |
3908 | ||
3909 | static const struct file_operations proc_modules_operations = { | |
3910 | .open = modules_open, | |
3911 | .read = seq_read, | |
3912 | .llseek = seq_lseek, | |
3913 | .release = seq_release, | |
3914 | }; | |
3915 | ||
3916 | static int __init proc_modules_init(void) | |
3917 | { | |
3918 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3919 | return 0; | |
3920 | } | |
3921 | module_init(proc_modules_init); | |
3922 | #endif | |
3923 | ||
1da177e4 LT |
3924 | /* Given an address, look for it in the module exception tables. */ |
3925 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3926 | { | |
1da177e4 LT |
3927 | const struct exception_table_entry *e = NULL; |
3928 | struct module *mod; | |
3929 | ||
24da1cbf | 3930 | preempt_disable(); |
d72b3751 | 3931 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3932 | if (mod->state == MODULE_STATE_UNFORMED) |
3933 | continue; | |
1da177e4 LT |
3934 | if (mod->num_exentries == 0) |
3935 | continue; | |
22a8bdeb | 3936 | |
1da177e4 LT |
3937 | e = search_extable(mod->extable, |
3938 | mod->extable + mod->num_exentries - 1, | |
3939 | addr); | |
3940 | if (e) | |
3941 | break; | |
3942 | } | |
24da1cbf | 3943 | preempt_enable(); |
1da177e4 LT |
3944 | |
3945 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3946 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3947 | return e; |
3948 | } | |
3949 | ||
4d435f9d | 3950 | /* |
e610499e RR |
3951 | * is_module_address - is this address inside a module? |
3952 | * @addr: the address to check. | |
3953 | * | |
3954 | * See is_module_text_address() if you simply want to see if the address | |
3955 | * is code (not data). | |
4d435f9d | 3956 | */ |
e610499e | 3957 | bool is_module_address(unsigned long addr) |
4d435f9d | 3958 | { |
e610499e | 3959 | bool ret; |
4d435f9d | 3960 | |
24da1cbf | 3961 | preempt_disable(); |
e610499e | 3962 | ret = __module_address(addr) != NULL; |
24da1cbf | 3963 | preempt_enable(); |
4d435f9d | 3964 | |
e610499e | 3965 | return ret; |
4d435f9d IM |
3966 | } |
3967 | ||
e610499e RR |
3968 | /* |
3969 | * __module_address - get the module which contains an address. | |
3970 | * @addr: the address. | |
3971 | * | |
3972 | * Must be called with preempt disabled or module mutex held so that | |
3973 | * module doesn't get freed during this. | |
3974 | */ | |
714f83d5 | 3975 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3976 | { |
3977 | struct module *mod; | |
3978 | ||
3a642e99 RR |
3979 | if (addr < module_addr_min || addr > module_addr_max) |
3980 | return NULL; | |
3981 | ||
0be964be PZ |
3982 | module_assert_mutex_or_preempt(); |
3983 | ||
6c9692e2 | 3984 | mod = mod_find(addr); |
93c2e105 PZ |
3985 | if (mod) { |
3986 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 3987 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 3988 | mod = NULL; |
0d21b0e3 | 3989 | } |
93c2e105 | 3990 | return mod; |
1da177e4 | 3991 | } |
c6b37801 | 3992 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3993 | |
e610499e RR |
3994 | /* |
3995 | * is_module_text_address - is this address inside module code? | |
3996 | * @addr: the address to check. | |
3997 | * | |
3998 | * See is_module_address() if you simply want to see if the address is | |
3999 | * anywhere in a module. See kernel_text_address() for testing if an | |
4000 | * address corresponds to kernel or module code. | |
4001 | */ | |
4002 | bool is_module_text_address(unsigned long addr) | |
4003 | { | |
4004 | bool ret; | |
4005 | ||
4006 | preempt_disable(); | |
4007 | ret = __module_text_address(addr) != NULL; | |
4008 | preempt_enable(); | |
4009 | ||
4010 | return ret; | |
4011 | } | |
4012 | ||
4013 | /* | |
4014 | * __module_text_address - get the module whose code contains an address. | |
4015 | * @addr: the address. | |
4016 | * | |
4017 | * Must be called with preempt disabled or module mutex held so that | |
4018 | * module doesn't get freed during this. | |
4019 | */ | |
4020 | struct module *__module_text_address(unsigned long addr) | |
4021 | { | |
4022 | struct module *mod = __module_address(addr); | |
4023 | if (mod) { | |
4024 | /* Make sure it's within the text section. */ | |
4025 | if (!within(addr, mod->module_init, mod->init_text_size) | |
4026 | && !within(addr, mod->module_core, mod->core_text_size)) | |
4027 | mod = NULL; | |
4028 | } | |
4029 | return mod; | |
4030 | } | |
c6b37801 | 4031 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4032 | |
1da177e4 LT |
4033 | /* Don't grab lock, we're oopsing. */ |
4034 | void print_modules(void) | |
4035 | { | |
4036 | struct module *mod; | |
2bc2d61a | 4037 | char buf[8]; |
1da177e4 | 4038 | |
b231125a | 4039 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4040 | /* Most callers should already have preempt disabled, but make sure */ |
4041 | preempt_disable(); | |
0d21b0e3 RR |
4042 | list_for_each_entry_rcu(mod, &modules, list) { |
4043 | if (mod->state == MODULE_STATE_UNFORMED) | |
4044 | continue; | |
27bba4d6 | 4045 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4046 | } |
d72b3751 | 4047 | preempt_enable(); |
e14af7ee | 4048 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4049 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4050 | pr_cont("\n"); | |
1da177e4 LT |
4051 | } |
4052 | ||
1da177e4 | 4053 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4054 | /* Generate the signature for all relevant module structures here. |
4055 | * If these change, we don't want to try to parse the module. */ | |
4056 | void module_layout(struct module *mod, | |
4057 | struct modversion_info *ver, | |
4058 | struct kernel_param *kp, | |
4059 | struct kernel_symbol *ks, | |
65498646 | 4060 | struct tracepoint * const *tp) |
8c8ef42a RR |
4061 | { |
4062 | } | |
4063 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4064 | #endif |