Commit | Line | Data |
---|---|---|
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> |
8a293be0 | 20 | #include <linux/extable.h> |
1da177e4 | 21 | #include <linux/moduleloader.h> |
af658dca | 22 | #include <linux/trace_events.h> |
1da177e4 | 23 | #include <linux/init.h> |
ae84e324 | 24 | #include <linux/kallsyms.h> |
34e1169d | 25 | #include <linux/file.h> |
3b5d5c6b | 26 | #include <linux/fs.h> |
6d760133 | 27 | #include <linux/sysfs.h> |
9f158333 | 28 | #include <linux/kernel.h> |
1da177e4 LT |
29 | #include <linux/slab.h> |
30 | #include <linux/vmalloc.h> | |
31 | #include <linux/elf.h> | |
3b5d5c6b | 32 | #include <linux/proc_fs.h> |
2e72d51b | 33 | #include <linux/security.h> |
1da177e4 LT |
34 | #include <linux/seq_file.h> |
35 | #include <linux/syscalls.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/rcupdate.h> | |
c59ede7b | 38 | #include <linux/capability.h> |
1da177e4 LT |
39 | #include <linux/cpu.h> |
40 | #include <linux/moduleparam.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/err.h> | |
43 | #include <linux/vermagic.h> | |
44 | #include <linux/notifier.h> | |
f6a57033 | 45 | #include <linux/sched.h> |
1da177e4 | 46 | #include <linux/device.h> |
c988d2b2 | 47 | #include <linux/string.h> |
97d1f15b | 48 | #include <linux/mutex.h> |
d72b3751 | 49 | #include <linux/rculist.h> |
7c0f6ba6 | 50 | #include <linux/uaccess.h> |
1da177e4 | 51 | #include <asm/cacheflush.h> |
563ec5cb | 52 | #include <linux/set_memory.h> |
eb8cdec4 | 53 | #include <asm/mmu_context.h> |
b817f6fe | 54 | #include <linux/license.h> |
6d762394 | 55 | #include <asm/sections.h> |
97e1c18e | 56 | #include <linux/tracepoint.h> |
90d595fe | 57 | #include <linux/ftrace.h> |
7e545d6e | 58 | #include <linux/livepatch.h> |
22a9d645 | 59 | #include <linux/async.h> |
fbf59bc9 | 60 | #include <linux/percpu.h> |
4f2294b6 | 61 | #include <linux/kmemleak.h> |
bf5438fc | 62 | #include <linux/jump_label.h> |
84e1c6bb | 63 | #include <linux/pfn.h> |
403ed278 | 64 | #include <linux/bsearch.h> |
9d5059c9 | 65 | #include <linux/dynamic_debug.h> |
ca86cad7 | 66 | #include <linux/audit.h> |
2f3238ae | 67 | #include <uapi/linux/module.h> |
106a4ee2 | 68 | #include "module-internal.h" |
1da177e4 | 69 | |
7ead8b83 LZ |
70 | #define CREATE_TRACE_POINTS |
71 | #include <trace/events/module.h> | |
72 | ||
1da177e4 LT |
73 | #ifndef ARCH_SHF_SMALL |
74 | #define ARCH_SHF_SMALL 0 | |
75 | #endif | |
76 | ||
84e1c6bb | 77 | /* |
78 | * Modules' sections will be aligned on page boundaries | |
79 | * to ensure complete separation of code and data, but | |
0f5bf6d0 | 80 | * only when CONFIG_STRICT_MODULE_RWX=y |
84e1c6bb | 81 | */ |
0f5bf6d0 | 82 | #ifdef CONFIG_STRICT_MODULE_RWX |
84e1c6bb | 83 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
84 | #else | |
85 | # define debug_align(X) (X) | |
86 | #endif | |
87 | ||
1da177e4 LT |
88 | /* If this is set, the section belongs in the init part of the module */ |
89 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
90 | ||
75676500 RR |
91 | /* |
92 | * Mutex protects: | |
93 | * 1) List of modules (also safely readable with preempt_disable), | |
94 | * 2) module_use links, | |
95 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 96 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
97 | DEFINE_MUTEX(module_mutex); |
98 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 99 | static LIST_HEAD(modules); |
67fc4e0c | 100 | |
6c9692e2 | 101 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 102 | |
93c2e105 PZ |
103 | /* |
104 | * Use a latched RB-tree for __module_address(); this allows us to use | |
105 | * RCU-sched lookups of the address from any context. | |
106 | * | |
6c9692e2 PZ |
107 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
108 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
109 | * NMI context. | |
93c2e105 PZ |
110 | */ |
111 | ||
112 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 113 | { |
7523e4dc | 114 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 115 | |
7523e4dc | 116 | return (unsigned long)layout->base; |
93c2e105 PZ |
117 | } |
118 | ||
119 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
120 | { | |
7523e4dc | 121 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 122 | |
7523e4dc | 123 | return (unsigned long)layout->size; |
93c2e105 PZ |
124 | } |
125 | ||
126 | static __always_inline bool | |
127 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
128 | { | |
129 | return __mod_tree_val(a) < __mod_tree_val(b); | |
130 | } | |
131 | ||
132 | static __always_inline int | |
133 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
134 | { | |
135 | unsigned long val = (unsigned long)key; | |
136 | unsigned long start, end; | |
137 | ||
138 | start = __mod_tree_val(n); | |
139 | if (val < start) | |
140 | return -1; | |
141 | ||
142 | end = start + __mod_tree_size(n); | |
143 | if (val >= end) | |
144 | return 1; | |
106a4ee2 | 145 | |
106a4ee2 RR |
146 | return 0; |
147 | } | |
148 | ||
93c2e105 PZ |
149 | static const struct latch_tree_ops mod_tree_ops = { |
150 | .less = mod_tree_less, | |
151 | .comp = mod_tree_comp, | |
152 | }; | |
153 | ||
4f666546 PZ |
154 | static struct mod_tree_root { |
155 | struct latch_tree_root root; | |
156 | unsigned long addr_min; | |
157 | unsigned long addr_max; | |
158 | } mod_tree __cacheline_aligned = { | |
159 | .addr_min = -1UL, | |
106a4ee2 | 160 | }; |
106a4ee2 | 161 | |
4f666546 PZ |
162 | #define module_addr_min mod_tree.addr_min |
163 | #define module_addr_max mod_tree.addr_max | |
164 | ||
165 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
166 | { | |
167 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
168 | } | |
169 | ||
170 | static void __mod_tree_remove(struct mod_tree_node *node) | |
171 | { | |
172 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
173 | } | |
93c2e105 PZ |
174 | |
175 | /* | |
176 | * These modifications: insert, remove_init and remove; are serialized by the | |
177 | * module_mutex. | |
178 | */ | |
179 | static void mod_tree_insert(struct module *mod) | |
180 | { | |
7523e4dc RR |
181 | mod->core_layout.mtn.mod = mod; |
182 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 183 | |
7523e4dc RR |
184 | __mod_tree_insert(&mod->core_layout.mtn); |
185 | if (mod->init_layout.size) | |
186 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
187 | } |
188 | ||
189 | static void mod_tree_remove_init(struct module *mod) | |
190 | { | |
7523e4dc RR |
191 | if (mod->init_layout.size) |
192 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
193 | } |
194 | ||
195 | static void mod_tree_remove(struct module *mod) | |
196 | { | |
7523e4dc | 197 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
198 | mod_tree_remove_init(mod); |
199 | } | |
200 | ||
6c9692e2 | 201 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
202 | { |
203 | struct latch_tree_node *ltn; | |
204 | ||
4f666546 | 205 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
206 | if (!ltn) |
207 | return NULL; | |
208 | ||
209 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
210 | } | |
211 | ||
6c9692e2 PZ |
212 | #else /* MODULES_TREE_LOOKUP */ |
213 | ||
4f666546 PZ |
214 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
215 | ||
6c9692e2 PZ |
216 | static void mod_tree_insert(struct module *mod) { } |
217 | static void mod_tree_remove_init(struct module *mod) { } | |
218 | static void mod_tree_remove(struct module *mod) { } | |
219 | ||
220 | static struct module *mod_find(unsigned long addr) | |
221 | { | |
222 | struct module *mod; | |
223 | ||
224 | list_for_each_entry_rcu(mod, &modules, list) { | |
225 | if (within_module(addr, mod)) | |
226 | return mod; | |
227 | } | |
228 | ||
229 | return NULL; | |
230 | } | |
231 | ||
232 | #endif /* MODULES_TREE_LOOKUP */ | |
233 | ||
4f666546 PZ |
234 | /* |
235 | * Bounds of module text, for speeding up __module_address. | |
236 | * Protected by module_mutex. | |
237 | */ | |
238 | static void __mod_update_bounds(void *base, unsigned int size) | |
239 | { | |
240 | unsigned long min = (unsigned long)base; | |
241 | unsigned long max = min + size; | |
242 | ||
243 | if (min < module_addr_min) | |
244 | module_addr_min = min; | |
245 | if (max > module_addr_max) | |
246 | module_addr_max = max; | |
247 | } | |
248 | ||
249 | static void mod_update_bounds(struct module *mod) | |
250 | { | |
7523e4dc RR |
251 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
252 | if (mod->init_layout.size) | |
253 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
254 | } |
255 | ||
67fc4e0c JW |
256 | #ifdef CONFIG_KGDB_KDB |
257 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
258 | #endif /* CONFIG_KGDB_KDB */ | |
259 | ||
0be964be PZ |
260 | static void module_assert_mutex(void) |
261 | { | |
262 | lockdep_assert_held(&module_mutex); | |
263 | } | |
264 | ||
265 | static void module_assert_mutex_or_preempt(void) | |
266 | { | |
267 | #ifdef CONFIG_LOCKDEP | |
268 | if (unlikely(!debug_locks)) | |
269 | return; | |
270 | ||
9502514f | 271 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
272 | !lockdep_is_held(&module_mutex)); |
273 | #endif | |
274 | } | |
275 | ||
6727bb9c | 276 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 277 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 278 | |
fda784e5 BM |
279 | /* |
280 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
281 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
282 | */ | |
283 | bool is_module_sig_enforced(void) | |
284 | { | |
285 | return sig_enforce; | |
286 | } | |
287 | EXPORT_SYMBOL(is_module_sig_enforced); | |
288 | ||
19e4529e SR |
289 | /* Block module loading/unloading? */ |
290 | int modules_disabled = 0; | |
02608bef | 291 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 292 | |
c9a3ba55 RR |
293 | /* Waiting for a module to finish initializing? */ |
294 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
295 | ||
e041c683 | 296 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 297 | |
6da0b565 | 298 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 299 | { |
e041c683 | 300 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
301 | } |
302 | EXPORT_SYMBOL(register_module_notifier); | |
303 | ||
6da0b565 | 304 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 305 | { |
e041c683 | 306 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
307 | } |
308 | EXPORT_SYMBOL(unregister_module_notifier); | |
309 | ||
71d9f507 MB |
310 | /* |
311 | * We require a truly strong try_module_get(): 0 means success. | |
312 | * Otherwise an error is returned due to ongoing or failed | |
313 | * initialization etc. | |
314 | */ | |
1da177e4 LT |
315 | static inline int strong_try_module_get(struct module *mod) |
316 | { | |
0d21b0e3 | 317 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 318 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
319 | return -EBUSY; |
320 | if (try_module_get(mod)) | |
1da177e4 | 321 | return 0; |
c9a3ba55 RR |
322 | else |
323 | return -ENOENT; | |
1da177e4 LT |
324 | } |
325 | ||
373d4d09 RR |
326 | static inline void add_taint_module(struct module *mod, unsigned flag, |
327 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 328 | { |
373d4d09 | 329 | add_taint(flag, lockdep_ok); |
7fd8329b | 330 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
331 | } |
332 | ||
02a3e59a RD |
333 | /* |
334 | * A thread that wants to hold a reference to a module only while it | |
335 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 336 | */ |
bf262dce | 337 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
338 | { |
339 | module_put(mod); | |
340 | do_exit(code); | |
341 | } | |
342 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 343 | |
1da177e4 | 344 | /* Find a module section: 0 means not found. */ |
49668688 | 345 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
346 | { |
347 | unsigned int i; | |
348 | ||
49668688 RR |
349 | for (i = 1; i < info->hdr->e_shnum; i++) { |
350 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 351 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
352 | if ((shdr->sh_flags & SHF_ALLOC) |
353 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 354 | return i; |
49668688 | 355 | } |
1da177e4 LT |
356 | return 0; |
357 | } | |
358 | ||
5e458cc0 | 359 | /* Find a module section, or NULL. */ |
49668688 | 360 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
361 | { |
362 | /* Section 0 has sh_addr 0. */ | |
49668688 | 363 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
364 | } |
365 | ||
366 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 367 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
368 | const char *name, |
369 | size_t object_size, | |
370 | unsigned int *num) | |
371 | { | |
49668688 | 372 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
373 | |
374 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
375 | *num = info->sechdrs[sec].sh_size / object_size; |
376 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
377 | } |
378 | ||
1da177e4 LT |
379 | /* Provided by the linker */ |
380 | extern const struct kernel_symbol __start___ksymtab[]; | |
381 | extern const struct kernel_symbol __stop___ksymtab[]; | |
382 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
383 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
384 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
385 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
386 | extern const s32 __start___kcrctab[]; |
387 | extern const s32 __start___kcrctab_gpl[]; | |
388 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
389 | #ifdef CONFIG_UNUSED_SYMBOLS |
390 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
391 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
392 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
393 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
394 | extern const s32 __start___kcrctab_unused[]; |
395 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 396 | #endif |
1da177e4 LT |
397 | |
398 | #ifndef CONFIG_MODVERSIONS | |
399 | #define symversion(base, idx) NULL | |
400 | #else | |
f83ca9fe | 401 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
402 | #endif |
403 | ||
dafd0940 RR |
404 | static bool each_symbol_in_section(const struct symsearch *arr, |
405 | unsigned int arrsize, | |
406 | struct module *owner, | |
407 | bool (*fn)(const struct symsearch *syms, | |
408 | struct module *owner, | |
de4d8d53 | 409 | void *data), |
dafd0940 | 410 | void *data) |
ad9546c9 | 411 | { |
de4d8d53 | 412 | unsigned int j; |
ad9546c9 | 413 | |
dafd0940 | 414 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
415 | if (fn(&arr[j], owner, data)) |
416 | return true; | |
f71d20e9 | 417 | } |
dafd0940 RR |
418 | |
419 | return false; | |
ad9546c9 RR |
420 | } |
421 | ||
dafd0940 | 422 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
423 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
424 | struct module *owner, | |
425 | void *data), | |
426 | void *data) | |
ad9546c9 RR |
427 | { |
428 | struct module *mod; | |
44032e63 | 429 | static const struct symsearch arr[] = { |
ad9546c9 | 430 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 431 | NOT_GPL_ONLY, false }, |
ad9546c9 | 432 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
433 | __start___kcrctab_gpl, |
434 | GPL_ONLY, false }, | |
ad9546c9 | 435 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
436 | __start___kcrctab_gpl_future, |
437 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 438 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 439 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
440 | __start___kcrctab_unused, |
441 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 442 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
443 | __start___kcrctab_unused_gpl, |
444 | GPL_ONLY, true }, | |
f7f5b675 | 445 | #endif |
ad9546c9 | 446 | }; |
f71d20e9 | 447 | |
0be964be PZ |
448 | module_assert_mutex_or_preempt(); |
449 | ||
dafd0940 RR |
450 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
451 | return true; | |
f71d20e9 | 452 | |
d72b3751 | 453 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
454 | struct symsearch arr[] = { |
455 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 456 | NOT_GPL_ONLY, false }, |
ad9546c9 | 457 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
458 | mod->gpl_crcs, |
459 | GPL_ONLY, false }, | |
ad9546c9 RR |
460 | { mod->gpl_future_syms, |
461 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
462 | mod->gpl_future_crcs, |
463 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 464 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
465 | { mod->unused_syms, |
466 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
467 | mod->unused_crcs, |
468 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
469 | { mod->unused_gpl_syms, |
470 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
471 | mod->unused_gpl_crcs, |
472 | GPL_ONLY, true }, | |
f7f5b675 | 473 | #endif |
ad9546c9 RR |
474 | }; |
475 | ||
0d21b0e3 RR |
476 | if (mod->state == MODULE_STATE_UNFORMED) |
477 | continue; | |
478 | ||
dafd0940 RR |
479 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
480 | return true; | |
481 | } | |
482 | return false; | |
483 | } | |
de4d8d53 | 484 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
485 | |
486 | struct find_symbol_arg { | |
487 | /* Input */ | |
488 | const char *name; | |
489 | bool gplok; | |
490 | bool warn; | |
491 | ||
492 | /* Output */ | |
493 | struct module *owner; | |
71810db2 | 494 | const s32 *crc; |
414fd31b | 495 | const struct kernel_symbol *sym; |
dafd0940 RR |
496 | }; |
497 | ||
de4d8d53 RR |
498 | static bool check_symbol(const struct symsearch *syms, |
499 | struct module *owner, | |
500 | unsigned int symnum, void *data) | |
dafd0940 RR |
501 | { |
502 | struct find_symbol_arg *fsa = data; | |
503 | ||
dafd0940 RR |
504 | if (!fsa->gplok) { |
505 | if (syms->licence == GPL_ONLY) | |
506 | return false; | |
507 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
508 | pr_warn("Symbol %s is being used by a non-GPL module, " |
509 | "which will not be allowed in the future\n", | |
510 | fsa->name); | |
9f28bb7e | 511 | } |
1da177e4 | 512 | } |
ad9546c9 | 513 | |
f7f5b675 | 514 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 515 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
516 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
517 | "using it.\n", fsa->name); | |
518 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
519 | pr_warn("Please evaluate if this is the right api to use and " |
520 | "if it really is, submit a report to the linux kernel " | |
521 | "mailing list together with submitting your code for " | |
bddb12b3 | 522 | "inclusion.\n"); |
dafd0940 | 523 | } |
f7f5b675 | 524 | #endif |
dafd0940 RR |
525 | |
526 | fsa->owner = owner; | |
527 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 528 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
529 | return true; |
530 | } | |
531 | ||
403ed278 AIB |
532 | static int cmp_name(const void *va, const void *vb) |
533 | { | |
534 | const char *a; | |
535 | const struct kernel_symbol *b; | |
536 | a = va; b = vb; | |
537 | return strcmp(a, b->name); | |
538 | } | |
539 | ||
de4d8d53 RR |
540 | static bool find_symbol_in_section(const struct symsearch *syms, |
541 | struct module *owner, | |
542 | void *data) | |
543 | { | |
544 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
545 | struct kernel_symbol *sym; |
546 | ||
547 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
548 | sizeof(struct kernel_symbol), cmp_name); | |
549 | ||
550 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
551 | return true; | |
de4d8d53 | 552 | |
de4d8d53 RR |
553 | return false; |
554 | } | |
555 | ||
414fd31b | 556 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 557 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
558 | const struct kernel_symbol *find_symbol(const char *name, |
559 | struct module **owner, | |
71810db2 | 560 | const s32 **crc, |
c6b37801 TA |
561 | bool gplok, |
562 | bool warn) | |
dafd0940 RR |
563 | { |
564 | struct find_symbol_arg fsa; | |
565 | ||
566 | fsa.name = name; | |
567 | fsa.gplok = gplok; | |
568 | fsa.warn = warn; | |
569 | ||
de4d8d53 | 570 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
571 | if (owner) |
572 | *owner = fsa.owner; | |
573 | if (crc) | |
574 | *crc = fsa.crc; | |
414fd31b | 575 | return fsa.sym; |
dafd0940 RR |
576 | } |
577 | ||
5e124169 | 578 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 579 | return NULL; |
1da177e4 | 580 | } |
c6b37801 | 581 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 582 | |
fe0d34d2 RR |
583 | /* |
584 | * Search for module by name: must hold module_mutex (or preempt disabled | |
585 | * for read-only access). | |
586 | */ | |
4f6de4d5 | 587 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 588 | bool even_unformed) |
1da177e4 LT |
589 | { |
590 | struct module *mod; | |
591 | ||
fe0d34d2 | 592 | module_assert_mutex_or_preempt(); |
0be964be | 593 | |
93437353 | 594 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
595 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
596 | continue; | |
4f6de4d5 | 597 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
598 | return mod; |
599 | } | |
600 | return NULL; | |
601 | } | |
0d21b0e3 RR |
602 | |
603 | struct module *find_module(const char *name) | |
604 | { | |
fe0d34d2 | 605 | module_assert_mutex(); |
4f6de4d5 | 606 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 607 | } |
c6b37801 | 608 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
609 | |
610 | #ifdef CONFIG_SMP | |
fbf59bc9 | 611 | |
259354de | 612 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 613 | { |
259354de TH |
614 | return mod->percpu; |
615 | } | |
fbf59bc9 | 616 | |
9eb76d77 | 617 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 618 | { |
9eb76d77 RR |
619 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
620 | unsigned long align = pcpusec->sh_addralign; | |
621 | ||
622 | if (!pcpusec->sh_size) | |
623 | return 0; | |
624 | ||
fbf59bc9 | 625 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
626 | pr_warn("%s: per-cpu alignment %li > %li\n", |
627 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
628 | align = PAGE_SIZE; |
629 | } | |
630 | ||
9eb76d77 | 631 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 632 | if (!mod->percpu) { |
bddb12b3 AM |
633 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
634 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
635 | return -ENOMEM; |
636 | } | |
9eb76d77 | 637 | mod->percpu_size = pcpusec->sh_size; |
259354de | 638 | return 0; |
fbf59bc9 TH |
639 | } |
640 | ||
259354de | 641 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 642 | { |
259354de | 643 | free_percpu(mod->percpu); |
fbf59bc9 TH |
644 | } |
645 | ||
49668688 | 646 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 647 | { |
49668688 | 648 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
649 | } |
650 | ||
259354de TH |
651 | static void percpu_modcopy(struct module *mod, |
652 | const void *from, unsigned long size) | |
6b588c18 TH |
653 | { |
654 | int cpu; | |
655 | ||
656 | for_each_possible_cpu(cpu) | |
259354de | 657 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
658 | } |
659 | ||
383776fa | 660 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
661 | { |
662 | struct module *mod; | |
663 | unsigned int cpu; | |
664 | ||
665 | preempt_disable(); | |
666 | ||
667 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
668 | if (mod->state == MODULE_STATE_UNFORMED) |
669 | continue; | |
10fad5e4 TH |
670 | if (!mod->percpu_size) |
671 | continue; | |
672 | for_each_possible_cpu(cpu) { | |
673 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 674 | void *va = (void *)addr; |
10fad5e4 | 675 | |
383776fa | 676 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 677 | if (can_addr) { |
383776fa | 678 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
679 | *can_addr += (unsigned long) |
680 | per_cpu_ptr(mod->percpu, | |
681 | get_boot_cpu_id()); | |
682 | } | |
10fad5e4 TH |
683 | preempt_enable(); |
684 | return true; | |
685 | } | |
686 | } | |
687 | } | |
688 | ||
689 | preempt_enable(); | |
690 | return false; | |
6b588c18 TH |
691 | } |
692 | ||
383776fa TG |
693 | /** |
694 | * is_module_percpu_address - test whether address is from module static percpu | |
695 | * @addr: address to test | |
696 | * | |
697 | * Test whether @addr belongs to module static percpu area. | |
698 | * | |
699 | * RETURNS: | |
700 | * %true if @addr is from module static percpu area | |
701 | */ | |
702 | bool is_module_percpu_address(unsigned long addr) | |
703 | { | |
704 | return __is_module_percpu_address(addr, NULL); | |
705 | } | |
706 | ||
1da177e4 | 707 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 708 | |
259354de | 709 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
710 | { |
711 | return NULL; | |
712 | } | |
9eb76d77 | 713 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 714 | { |
9eb76d77 RR |
715 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
716 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
717 | return -ENOMEM; | |
718 | return 0; | |
259354de TH |
719 | } |
720 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 721 | { |
1da177e4 | 722 | } |
49668688 | 723 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
724 | { |
725 | return 0; | |
726 | } | |
259354de TH |
727 | static inline void percpu_modcopy(struct module *mod, |
728 | const void *from, unsigned long size) | |
1da177e4 LT |
729 | { |
730 | /* pcpusec should be 0, and size of that section should be 0. */ | |
731 | BUG_ON(size != 0); | |
732 | } | |
10fad5e4 TH |
733 | bool is_module_percpu_address(unsigned long addr) |
734 | { | |
735 | return false; | |
736 | } | |
6b588c18 | 737 | |
383776fa TG |
738 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
739 | { | |
740 | return false; | |
741 | } | |
742 | ||
1da177e4 LT |
743 | #endif /* CONFIG_SMP */ |
744 | ||
c988d2b2 MD |
745 | #define MODINFO_ATTR(field) \ |
746 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
747 | { \ | |
748 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
749 | } \ | |
750 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 751 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 752 | { \ |
cc56ded3 | 753 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
754 | } \ |
755 | static int modinfo_##field##_exists(struct module *mod) \ | |
756 | { \ | |
757 | return mod->field != NULL; \ | |
758 | } \ | |
759 | static void free_modinfo_##field(struct module *mod) \ | |
760 | { \ | |
22a8bdeb DW |
761 | kfree(mod->field); \ |
762 | mod->field = NULL; \ | |
c988d2b2 MD |
763 | } \ |
764 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 765 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
766 | .show = show_modinfo_##field, \ |
767 | .setup = setup_modinfo_##field, \ | |
768 | .test = modinfo_##field##_exists, \ | |
769 | .free = free_modinfo_##field, \ | |
770 | }; | |
771 | ||
772 | MODINFO_ATTR(version); | |
773 | MODINFO_ATTR(srcversion); | |
774 | ||
e14af7ee AV |
775 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
776 | ||
03e88ae1 | 777 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
778 | |
779 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
780 | ||
e513cc1c MH |
781 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
782 | #define MODULE_REF_BASE 1 | |
783 | ||
1da177e4 | 784 | /* Init the unload section of the module. */ |
9f85a4bb | 785 | static int module_unload_init(struct module *mod) |
1da177e4 | 786 | { |
e513cc1c MH |
787 | /* |
788 | * Initialize reference counter to MODULE_REF_BASE. | |
789 | * refcnt == 0 means module is going. | |
790 | */ | |
791 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 792 | |
2c02dfe7 LT |
793 | INIT_LIST_HEAD(&mod->source_list); |
794 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 795 | |
1da177e4 | 796 | /* Hold reference count during initialization. */ |
e513cc1c | 797 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
798 | |
799 | return 0; | |
1da177e4 LT |
800 | } |
801 | ||
1da177e4 LT |
802 | /* Does a already use b? */ |
803 | static int already_uses(struct module *a, struct module *b) | |
804 | { | |
805 | struct module_use *use; | |
806 | ||
2c02dfe7 LT |
807 | list_for_each_entry(use, &b->source_list, source_list) { |
808 | if (use->source == a) { | |
5e124169 | 809 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
810 | return 1; |
811 | } | |
812 | } | |
5e124169 | 813 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
814 | return 0; |
815 | } | |
816 | ||
2c02dfe7 LT |
817 | /* |
818 | * Module a uses b | |
819 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
820 | * - the module_use is added to the list of 'b' sources (so | |
821 | * 'b' can walk the list to see who sourced them), and of 'a' | |
822 | * targets (so 'a' can see what modules it targets). | |
823 | */ | |
824 | static int add_module_usage(struct module *a, struct module *b) | |
825 | { | |
2c02dfe7 LT |
826 | struct module_use *use; |
827 | ||
5e124169 | 828 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 829 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 830 | if (!use) |
2c02dfe7 | 831 | return -ENOMEM; |
2c02dfe7 LT |
832 | |
833 | use->source = a; | |
834 | use->target = b; | |
835 | list_add(&use->source_list, &b->source_list); | |
836 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
837 | return 0; |
838 | } | |
839 | ||
75676500 | 840 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 841 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 842 | { |
c8e21ced | 843 | int err; |
270a6c4c | 844 | |
9bea7f23 | 845 | if (b == NULL || already_uses(a, b)) |
218ce735 | 846 | return 0; |
218ce735 | 847 | |
9bea7f23 RR |
848 | /* If module isn't available, we fail. */ |
849 | err = strong_try_module_get(b); | |
c9a3ba55 | 850 | if (err) |
9bea7f23 | 851 | return err; |
1da177e4 | 852 | |
2c02dfe7 LT |
853 | err = add_module_usage(a, b); |
854 | if (err) { | |
1da177e4 | 855 | module_put(b); |
9bea7f23 | 856 | return err; |
1da177e4 | 857 | } |
9bea7f23 | 858 | return 0; |
1da177e4 | 859 | } |
9bea7f23 | 860 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
861 | |
862 | /* Clear the unload stuff of the module. */ | |
863 | static void module_unload_free(struct module *mod) | |
864 | { | |
2c02dfe7 | 865 | struct module_use *use, *tmp; |
1da177e4 | 866 | |
75676500 | 867 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
868 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
869 | struct module *i = use->target; | |
5e124169 | 870 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
871 | module_put(i); |
872 | list_del(&use->source_list); | |
873 | list_del(&use->target_list); | |
874 | kfree(use); | |
1da177e4 | 875 | } |
75676500 | 876 | mutex_unlock(&module_mutex); |
1da177e4 LT |
877 | } |
878 | ||
879 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 880 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
881 | { |
882 | int ret = (flags & O_TRUNC); | |
883 | if (ret) | |
373d4d09 | 884 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
885 | return ret; |
886 | } | |
887 | #else | |
fb169793 | 888 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
889 | { |
890 | return 0; | |
891 | } | |
892 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
893 | ||
e513cc1c MH |
894 | /* Try to release refcount of module, 0 means success. */ |
895 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 896 | { |
e513cc1c | 897 | int ret; |
1da177e4 | 898 | |
e513cc1c MH |
899 | /* Try to decrement refcnt which we set at loading */ |
900 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
901 | BUG_ON(ret < 0); | |
902 | if (ret) | |
903 | /* Someone can put this right now, recover with checking */ | |
904 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 905 | |
e513cc1c MH |
906 | return ret; |
907 | } | |
1da177e4 | 908 | |
e513cc1c MH |
909 | static int try_stop_module(struct module *mod, int flags, int *forced) |
910 | { | |
da39ba5e | 911 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
912 | if (try_release_module_ref(mod) != 0) { |
913 | *forced = try_force_unload(flags); | |
914 | if (!(*forced)) | |
1da177e4 LT |
915 | return -EWOULDBLOCK; |
916 | } | |
917 | ||
918 | /* Mark it as dying. */ | |
e513cc1c | 919 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 920 | |
e513cc1c | 921 | return 0; |
1da177e4 LT |
922 | } |
923 | ||
d5db139a RR |
924 | /** |
925 | * module_refcount - return the refcount or -1 if unloading | |
926 | * | |
927 | * @mod: the module we're checking | |
928 | * | |
929 | * Returns: | |
930 | * -1 if the module is in the process of unloading | |
931 | * otherwise the number of references in the kernel to the module | |
932 | */ | |
933 | int module_refcount(struct module *mod) | |
1da177e4 | 934 | { |
d5db139a | 935 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
936 | } |
937 | EXPORT_SYMBOL(module_refcount); | |
938 | ||
939 | /* This exists whether we can unload or not */ | |
940 | static void free_module(struct module *mod); | |
941 | ||
17da2bd9 HC |
942 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
943 | unsigned int, flags) | |
1da177e4 LT |
944 | { |
945 | struct module *mod; | |
dfff0a06 | 946 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
947 | int ret, forced = 0; |
948 | ||
3d43321b | 949 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
950 | return -EPERM; |
951 | ||
952 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
953 | return -EFAULT; | |
954 | name[MODULE_NAME_LEN-1] = '\0'; | |
955 | ||
f6276ac9 RGB |
956 | audit_log_kern_module(name); |
957 | ||
3fc1f1e2 TH |
958 | if (mutex_lock_interruptible(&module_mutex) != 0) |
959 | return -EINTR; | |
1da177e4 LT |
960 | |
961 | mod = find_module(name); | |
962 | if (!mod) { | |
963 | ret = -ENOENT; | |
964 | goto out; | |
965 | } | |
966 | ||
2c02dfe7 | 967 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
968 | /* Other modules depend on us: get rid of them first. */ |
969 | ret = -EWOULDBLOCK; | |
970 | goto out; | |
971 | } | |
972 | ||
973 | /* Doing init or already dying? */ | |
974 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 975 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 976 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
977 | ret = -EBUSY; |
978 | goto out; | |
979 | } | |
980 | ||
981 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 982 | if (mod->init && !mod->exit) { |
fb169793 | 983 | forced = try_force_unload(flags); |
1da177e4 LT |
984 | if (!forced) { |
985 | /* This module can't be removed */ | |
986 | ret = -EBUSY; | |
987 | goto out; | |
988 | } | |
989 | } | |
990 | ||
1da177e4 LT |
991 | /* Stop the machine so refcounts can't move and disable module. */ |
992 | ret = try_stop_module(mod, flags, &forced); | |
993 | if (ret != 0) | |
994 | goto out; | |
995 | ||
df4b565e | 996 | mutex_unlock(&module_mutex); |
25985edc | 997 | /* Final destruction now no one is using it. */ |
df4b565e | 998 | if (mod->exit != NULL) |
1da177e4 | 999 | mod->exit(); |
df4b565e PO |
1000 | blocking_notifier_call_chain(&module_notify_list, |
1001 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1002 | klp_module_going(mod); |
7dcd182b JY |
1003 | ftrace_release_mod(mod); |
1004 | ||
22a9d645 | 1005 | async_synchronize_full(); |
75676500 | 1006 | |
e14af7ee | 1007 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1008 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1009 | |
75676500 RR |
1010 | free_module(mod); |
1011 | return 0; | |
1012 | out: | |
6389a385 | 1013 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1014 | return ret; |
1015 | } | |
1016 | ||
d1e99d7a | 1017 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1018 | { |
1019 | struct module_use *use; | |
1020 | int printed_something = 0; | |
1021 | ||
d5db139a | 1022 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1023 | |
6da0b565 IA |
1024 | /* |
1025 | * Always include a trailing , so userspace can differentiate | |
1026 | * between this and the old multi-field proc format. | |
1027 | */ | |
2c02dfe7 | 1028 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1029 | printed_something = 1; |
2c02dfe7 | 1030 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1031 | } |
1032 | ||
1da177e4 LT |
1033 | if (mod->init != NULL && mod->exit == NULL) { |
1034 | printed_something = 1; | |
6da0b565 | 1035 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1036 | } |
1037 | ||
1038 | if (!printed_something) | |
6da0b565 | 1039 | seq_puts(m, "-"); |
1da177e4 LT |
1040 | } |
1041 | ||
1042 | void __symbol_put(const char *symbol) | |
1043 | { | |
1044 | struct module *owner; | |
1da177e4 | 1045 | |
24da1cbf | 1046 | preempt_disable(); |
414fd31b | 1047 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1048 | BUG(); |
1049 | module_put(owner); | |
24da1cbf | 1050 | preempt_enable(); |
1da177e4 LT |
1051 | } |
1052 | EXPORT_SYMBOL(__symbol_put); | |
1053 | ||
7d1d16e4 | 1054 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1055 | void symbol_put_addr(void *addr) |
1056 | { | |
5e376613 | 1057 | struct module *modaddr; |
7d1d16e4 | 1058 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1059 | |
7d1d16e4 | 1060 | if (core_kernel_text(a)) |
5e376613 | 1061 | return; |
1da177e4 | 1062 | |
275d7d44 PZ |
1063 | /* |
1064 | * Even though we hold a reference on the module; we still need to | |
1065 | * disable preemption in order to safely traverse the data structure. | |
1066 | */ | |
1067 | preempt_disable(); | |
7d1d16e4 | 1068 | modaddr = __module_text_address(a); |
a6e6abd5 | 1069 | BUG_ON(!modaddr); |
5e376613 | 1070 | module_put(modaddr); |
275d7d44 | 1071 | preempt_enable(); |
1da177e4 LT |
1072 | } |
1073 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1074 | ||
1075 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1076 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1077 | { |
d5db139a | 1078 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1079 | } |
1080 | ||
cca3e707 KS |
1081 | static struct module_attribute modinfo_refcnt = |
1082 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1083 | |
d53799be SR |
1084 | void __module_get(struct module *module) |
1085 | { | |
1086 | if (module) { | |
1087 | preempt_disable(); | |
2f35c41f | 1088 | atomic_inc(&module->refcnt); |
d53799be SR |
1089 | trace_module_get(module, _RET_IP_); |
1090 | preempt_enable(); | |
1091 | } | |
1092 | } | |
1093 | EXPORT_SYMBOL(__module_get); | |
1094 | ||
1095 | bool try_module_get(struct module *module) | |
1096 | { | |
1097 | bool ret = true; | |
1098 | ||
1099 | if (module) { | |
1100 | preempt_disable(); | |
e513cc1c MH |
1101 | /* Note: here, we can fail to get a reference */ |
1102 | if (likely(module_is_live(module) && | |
1103 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1104 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1105 | else |
d53799be SR |
1106 | ret = false; |
1107 | ||
1108 | preempt_enable(); | |
1109 | } | |
1110 | return ret; | |
1111 | } | |
1112 | EXPORT_SYMBOL(try_module_get); | |
1113 | ||
f6a57033 AV |
1114 | void module_put(struct module *module) |
1115 | { | |
e513cc1c MH |
1116 | int ret; |
1117 | ||
f6a57033 | 1118 | if (module) { |
e1783a24 | 1119 | preempt_disable(); |
e513cc1c MH |
1120 | ret = atomic_dec_if_positive(&module->refcnt); |
1121 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1122 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1123 | preempt_enable(); |
f6a57033 AV |
1124 | } |
1125 | } | |
1126 | EXPORT_SYMBOL(module_put); | |
1127 | ||
1da177e4 | 1128 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1129 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1130 | { |
1131 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1132 | seq_puts(m, " - -"); |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | static inline void module_unload_free(struct module *mod) | |
1136 | { | |
1137 | } | |
1138 | ||
9bea7f23 | 1139 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1140 | { |
9bea7f23 | 1141 | return strong_try_module_get(b); |
1da177e4 | 1142 | } |
9bea7f23 | 1143 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1144 | |
9f85a4bb | 1145 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1146 | { |
9f85a4bb | 1147 | return 0; |
1da177e4 LT |
1148 | } |
1149 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1150 | ||
53999bf3 KW |
1151 | static size_t module_flags_taint(struct module *mod, char *buf) |
1152 | { | |
1153 | size_t l = 0; | |
7fd8329b PM |
1154 | int i; |
1155 | ||
1156 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1157 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1158 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1159 | } |
53999bf3 | 1160 | |
53999bf3 KW |
1161 | return l; |
1162 | } | |
1163 | ||
1f71740a | 1164 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1165 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1166 | { |
1167 | const char *state = "unknown"; | |
1168 | ||
4befb026 | 1169 | switch (mk->mod->state) { |
1f71740a KS |
1170 | case MODULE_STATE_LIVE: |
1171 | state = "live"; | |
1172 | break; | |
1173 | case MODULE_STATE_COMING: | |
1174 | state = "coming"; | |
1175 | break; | |
1176 | case MODULE_STATE_GOING: | |
1177 | state = "going"; | |
1178 | break; | |
0d21b0e3 RR |
1179 | default: |
1180 | BUG(); | |
1f71740a KS |
1181 | } |
1182 | return sprintf(buffer, "%s\n", state); | |
1183 | } | |
1184 | ||
cca3e707 KS |
1185 | static struct module_attribute modinfo_initstate = |
1186 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1187 | |
88bfa324 KS |
1188 | static ssize_t store_uevent(struct module_attribute *mattr, |
1189 | struct module_kobject *mk, | |
1190 | const char *buffer, size_t count) | |
1191 | { | |
f36776fa | 1192 | kobject_synth_uevent(&mk->kobj, buffer, count); |
88bfa324 KS |
1193 | return count; |
1194 | } | |
1195 | ||
cca3e707 KS |
1196 | struct module_attribute module_uevent = |
1197 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1198 | ||
1199 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1200 | struct module_kobject *mk, char *buffer) | |
1201 | { | |
7523e4dc | 1202 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1203 | } |
1204 | ||
1205 | static struct module_attribute modinfo_coresize = | |
1206 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1207 | ||
1208 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1209 | struct module_kobject *mk, char *buffer) | |
1210 | { | |
7523e4dc | 1211 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1212 | } |
1213 | ||
1214 | static struct module_attribute modinfo_initsize = | |
1215 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1216 | ||
1217 | static ssize_t show_taint(struct module_attribute *mattr, | |
1218 | struct module_kobject *mk, char *buffer) | |
1219 | { | |
1220 | size_t l; | |
1221 | ||
1222 | l = module_flags_taint(mk->mod, buffer); | |
1223 | buffer[l++] = '\n'; | |
1224 | return l; | |
1225 | } | |
1226 | ||
1227 | static struct module_attribute modinfo_taint = | |
1228 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1229 | |
03e88ae1 | 1230 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1231 | &module_uevent, |
03e88ae1 GKH |
1232 | &modinfo_version, |
1233 | &modinfo_srcversion, | |
cca3e707 KS |
1234 | &modinfo_initstate, |
1235 | &modinfo_coresize, | |
1236 | &modinfo_initsize, | |
1237 | &modinfo_taint, | |
03e88ae1 | 1238 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1239 | &modinfo_refcnt, |
03e88ae1 GKH |
1240 | #endif |
1241 | NULL, | |
1242 | }; | |
1243 | ||
1da177e4 LT |
1244 | static const char vermagic[] = VERMAGIC_STRING; |
1245 | ||
c6e665c8 | 1246 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1247 | { |
1248 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1249 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1250 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1251 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1252 | return 0; |
1253 | #else | |
1254 | return -ENOEXEC; | |
1255 | #endif | |
1256 | } | |
1257 | ||
1da177e4 | 1258 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1259 | |
1260 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1261 | { |
71810db2 | 1262 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1263 | } |
1264 | ||
49019426 | 1265 | static int check_version(const struct load_info *info, |
1da177e4 | 1266 | const char *symname, |
6da0b565 | 1267 | struct module *mod, |
71810db2 | 1268 | const s32 *crc) |
1da177e4 | 1269 | { |
49019426 KC |
1270 | Elf_Shdr *sechdrs = info->sechdrs; |
1271 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1272 | unsigned int i, num_versions; |
1273 | struct modversion_info *versions; | |
1274 | ||
1275 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1276 | if (!crc) | |
1277 | return 1; | |
1278 | ||
a5dd6970 RR |
1279 | /* No versions at all? modprobe --force does this. */ |
1280 | if (versindex == 0) | |
1281 | return try_to_force_load(mod, symname) == 0; | |
1282 | ||
1da177e4 LT |
1283 | versions = (void *) sechdrs[versindex].sh_addr; |
1284 | num_versions = sechdrs[versindex].sh_size | |
1285 | / sizeof(struct modversion_info); | |
1286 | ||
1287 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1288 | u32 crcval; |
1289 | ||
1da177e4 LT |
1290 | if (strcmp(versions[i].name, symname) != 0) |
1291 | continue; | |
1292 | ||
71810db2 AB |
1293 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1294 | crcval = resolve_rel_crc(crc); | |
1295 | else | |
1296 | crcval = *crc; | |
1297 | if (versions[i].crc == crcval) | |
1da177e4 | 1298 | return 1; |
71810db2 AB |
1299 | pr_debug("Found checksum %X vs module %lX\n", |
1300 | crcval, versions[i].crc); | |
826e4506 | 1301 | goto bad_version; |
1da177e4 | 1302 | } |
826e4506 | 1303 | |
faaae2a5 | 1304 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1305 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1306 | return 1; |
826e4506 LT |
1307 | |
1308 | bad_version: | |
6da0b565 | 1309 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1310 | info->name, symname); |
826e4506 | 1311 | return 0; |
1da177e4 LT |
1312 | } |
1313 | ||
49019426 | 1314 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1315 | struct module *mod) |
1316 | { | |
71810db2 | 1317 | const s32 *crc; |
1da177e4 | 1318 | |
926a59b1 PZ |
1319 | /* |
1320 | * Since this should be found in kernel (which can't be removed), no | |
1321 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1322 | */ | |
1323 | preempt_disable(); | |
996302c5 | 1324 | if (!find_symbol("module_layout", NULL, &crc, true, false)) { |
926a59b1 | 1325 | preempt_enable(); |
1da177e4 | 1326 | BUG(); |
926a59b1 PZ |
1327 | } |
1328 | preempt_enable(); | |
996302c5 | 1329 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1330 | } |
1331 | ||
91e37a79 RR |
1332 | /* First part is kernel version, which we ignore if module has crcs. */ |
1333 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1334 | bool has_crcs) | |
1da177e4 | 1335 | { |
91e37a79 RR |
1336 | if (has_crcs) { |
1337 | amagic += strcspn(amagic, " "); | |
1338 | bmagic += strcspn(bmagic, " "); | |
1339 | } | |
1da177e4 LT |
1340 | return strcmp(amagic, bmagic) == 0; |
1341 | } | |
1342 | #else | |
49019426 | 1343 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1344 | const char *symname, |
6da0b565 | 1345 | struct module *mod, |
71810db2 | 1346 | const s32 *crc) |
1da177e4 LT |
1347 | { |
1348 | return 1; | |
1349 | } | |
1350 | ||
49019426 | 1351 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1352 | struct module *mod) |
1353 | { | |
1354 | return 1; | |
1355 | } | |
1356 | ||
91e37a79 RR |
1357 | static inline int same_magic(const char *amagic, const char *bmagic, |
1358 | bool has_crcs) | |
1da177e4 LT |
1359 | { |
1360 | return strcmp(amagic, bmagic) == 0; | |
1361 | } | |
1362 | #endif /* CONFIG_MODVERSIONS */ | |
1363 | ||
75676500 | 1364 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1365 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1366 | const struct load_info *info, | |
414fd31b | 1367 | const char *name, |
9bea7f23 | 1368 | char ownername[]) |
1da177e4 LT |
1369 | { |
1370 | struct module *owner; | |
414fd31b | 1371 | const struct kernel_symbol *sym; |
71810db2 | 1372 | const s32 *crc; |
9bea7f23 | 1373 | int err; |
1da177e4 | 1374 | |
d64810f5 PZ |
1375 | /* |
1376 | * The module_mutex should not be a heavily contended lock; | |
1377 | * if we get the occasional sleep here, we'll go an extra iteration | |
1378 | * in the wait_event_interruptible(), which is harmless. | |
1379 | */ | |
1380 | sched_annotate_sleep(); | |
75676500 | 1381 | mutex_lock(&module_mutex); |
414fd31b | 1382 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1383 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1384 | if (!sym) |
1385 | goto unlock; | |
1386 | ||
49019426 | 1387 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1388 | sym = ERR_PTR(-EINVAL); |
1389 | goto getname; | |
1da177e4 | 1390 | } |
9bea7f23 RR |
1391 | |
1392 | err = ref_module(mod, owner); | |
1393 | if (err) { | |
1394 | sym = ERR_PTR(err); | |
1395 | goto getname; | |
1396 | } | |
1397 | ||
1398 | getname: | |
1399 | /* We must make copy under the lock if we failed to get ref. */ | |
1400 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1401 | unlock: | |
75676500 | 1402 | mutex_unlock(&module_mutex); |
218ce735 | 1403 | return sym; |
1da177e4 LT |
1404 | } |
1405 | ||
49668688 RR |
1406 | static const struct kernel_symbol * |
1407 | resolve_symbol_wait(struct module *mod, | |
1408 | const struct load_info *info, | |
1409 | const char *name) | |
9bea7f23 RR |
1410 | { |
1411 | const struct kernel_symbol *ksym; | |
49668688 | 1412 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1413 | |
1414 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1415 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1416 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1417 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1418 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1419 | mod->name, owner); | |
9bea7f23 RR |
1420 | } |
1421 | return ksym; | |
1422 | } | |
1423 | ||
1da177e4 LT |
1424 | /* |
1425 | * /sys/module/foo/sections stuff | |
1426 | * J. Corbet <corbet@lwn.net> | |
1427 | */ | |
8f6d0378 | 1428 | #ifdef CONFIG_SYSFS |
10b465aa | 1429 | |
8f6d0378 | 1430 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1431 | static inline bool sect_empty(const Elf_Shdr *sect) |
1432 | { | |
1433 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1434 | } | |
1435 | ||
6da0b565 | 1436 | struct module_sect_attr { |
a58730c4 RR |
1437 | struct module_attribute mattr; |
1438 | char *name; | |
1439 | unsigned long address; | |
1440 | }; | |
1441 | ||
6da0b565 | 1442 | struct module_sect_attrs { |
a58730c4 RR |
1443 | struct attribute_group grp; |
1444 | unsigned int nsections; | |
1445 | struct module_sect_attr attrs[0]; | |
1446 | }; | |
1447 | ||
1da177e4 | 1448 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1449 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1450 | { |
1451 | struct module_sect_attr *sattr = | |
1452 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1453 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1454 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1455 | } |
1456 | ||
04b1db9f IN |
1457 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1458 | { | |
a58730c4 | 1459 | unsigned int section; |
04b1db9f IN |
1460 | |
1461 | for (section = 0; section < sect_attrs->nsections; section++) | |
1462 | kfree(sect_attrs->attrs[section].name); | |
1463 | kfree(sect_attrs); | |
1464 | } | |
1465 | ||
8f6d0378 | 1466 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1467 | { |
1468 | unsigned int nloaded = 0, i, size[2]; | |
1469 | struct module_sect_attrs *sect_attrs; | |
1470 | struct module_sect_attr *sattr; | |
1471 | struct attribute **gattr; | |
22a8bdeb | 1472 | |
1da177e4 | 1473 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1474 | for (i = 0; i < info->hdr->e_shnum; i++) |
1475 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1476 | nloaded++; |
1477 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1478 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1479 | sizeof(sect_attrs->grp.attrs[0])); | |
1480 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1481 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1482 | if (sect_attrs == NULL) | |
1da177e4 LT |
1483 | return; |
1484 | ||
1485 | /* Setup section attributes. */ | |
1486 | sect_attrs->grp.name = "sections"; | |
1487 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1488 | ||
04b1db9f | 1489 | sect_attrs->nsections = 0; |
1da177e4 LT |
1490 | sattr = §_attrs->attrs[0]; |
1491 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1492 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1493 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1494 | if (sect_empty(sec)) | |
35dead42 | 1495 | continue; |
8f6d0378 RR |
1496 | sattr->address = sec->sh_addr; |
1497 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1498 | GFP_KERNEL); |
1499 | if (sattr->name == NULL) | |
1500 | goto out; | |
1501 | sect_attrs->nsections++; | |
361795b1 | 1502 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1503 | sattr->mattr.show = module_sect_show; |
1504 | sattr->mattr.store = NULL; | |
1505 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1506 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1507 | *(gattr++) = &(sattr++)->mattr.attr; |
1508 | } | |
1509 | *gattr = NULL; | |
1510 | ||
1511 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1512 | goto out; | |
1513 | ||
1514 | mod->sect_attrs = sect_attrs; | |
1515 | return; | |
1516 | out: | |
04b1db9f | 1517 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1518 | } |
1519 | ||
1520 | static void remove_sect_attrs(struct module *mod) | |
1521 | { | |
1522 | if (mod->sect_attrs) { | |
1523 | sysfs_remove_group(&mod->mkobj.kobj, | |
1524 | &mod->sect_attrs->grp); | |
1525 | /* We are positive that no one is using any sect attrs | |
1526 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1527 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1528 | mod->sect_attrs = NULL; |
1529 | } | |
1530 | } | |
1531 | ||
6d760133 RM |
1532 | /* |
1533 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1534 | */ | |
1535 | ||
1536 | struct module_notes_attrs { | |
1537 | struct kobject *dir; | |
1538 | unsigned int notes; | |
1539 | struct bin_attribute attrs[0]; | |
1540 | }; | |
1541 | ||
2c3c8bea | 1542 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1543 | struct bin_attribute *bin_attr, |
1544 | char *buf, loff_t pos, size_t count) | |
1545 | { | |
1546 | /* | |
1547 | * The caller checked the pos and count against our size. | |
1548 | */ | |
1549 | memcpy(buf, bin_attr->private + pos, count); | |
1550 | return count; | |
1551 | } | |
1552 | ||
1553 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1554 | unsigned int i) | |
1555 | { | |
1556 | if (notes_attrs->dir) { | |
1557 | while (i-- > 0) | |
1558 | sysfs_remove_bin_file(notes_attrs->dir, | |
1559 | ¬es_attrs->attrs[i]); | |
e9432093 | 1560 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1561 | } |
1562 | kfree(notes_attrs); | |
1563 | } | |
1564 | ||
8f6d0378 | 1565 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1566 | { |
1567 | unsigned int notes, loaded, i; | |
1568 | struct module_notes_attrs *notes_attrs; | |
1569 | struct bin_attribute *nattr; | |
1570 | ||
ea6bff36 IM |
1571 | /* failed to create section attributes, so can't create notes */ |
1572 | if (!mod->sect_attrs) | |
1573 | return; | |
1574 | ||
6d760133 RM |
1575 | /* Count notes sections and allocate structures. */ |
1576 | notes = 0; | |
8f6d0378 RR |
1577 | for (i = 0; i < info->hdr->e_shnum; i++) |
1578 | if (!sect_empty(&info->sechdrs[i]) && | |
1579 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1580 | ++notes; |
1581 | ||
1582 | if (notes == 0) | |
1583 | return; | |
1584 | ||
acafe7e3 | 1585 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1586 | GFP_KERNEL); |
1587 | if (notes_attrs == NULL) | |
1588 | return; | |
1589 | ||
1590 | notes_attrs->notes = notes; | |
1591 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1592 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1593 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1594 | continue; |
8f6d0378 | 1595 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1596 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1597 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1598 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1599 | nattr->size = info->sechdrs[i].sh_size; |
1600 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1601 | nattr->read = module_notes_read; |
1602 | ++nattr; | |
1603 | } | |
1604 | ++loaded; | |
1605 | } | |
1606 | ||
4ff6abff | 1607 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1608 | if (!notes_attrs->dir) |
1609 | goto out; | |
1610 | ||
1611 | for (i = 0; i < notes; ++i) | |
1612 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1613 | ¬es_attrs->attrs[i])) | |
1614 | goto out; | |
1615 | ||
1616 | mod->notes_attrs = notes_attrs; | |
1617 | return; | |
1618 | ||
1619 | out: | |
1620 | free_notes_attrs(notes_attrs, i); | |
1621 | } | |
1622 | ||
1623 | static void remove_notes_attrs(struct module *mod) | |
1624 | { | |
1625 | if (mod->notes_attrs) | |
1626 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1627 | } | |
1628 | ||
1da177e4 | 1629 | #else |
04b1db9f | 1630 | |
8f6d0378 RR |
1631 | static inline void add_sect_attrs(struct module *mod, |
1632 | const struct load_info *info) | |
1da177e4 LT |
1633 | { |
1634 | } | |
1635 | ||
1636 | static inline void remove_sect_attrs(struct module *mod) | |
1637 | { | |
1638 | } | |
6d760133 | 1639 | |
8f6d0378 RR |
1640 | static inline void add_notes_attrs(struct module *mod, |
1641 | const struct load_info *info) | |
6d760133 RM |
1642 | { |
1643 | } | |
1644 | ||
1645 | static inline void remove_notes_attrs(struct module *mod) | |
1646 | { | |
1647 | } | |
8f6d0378 | 1648 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1649 | |
1ba5c08b | 1650 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1651 | { |
1652 | #ifdef CONFIG_MODULE_UNLOAD | |
1653 | struct module_use *use; | |
80a3d1bb | 1654 | |
75676500 | 1655 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1656 | list_for_each_entry(use, &mod->target_list, target_list) |
1657 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1658 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1659 | #endif |
1660 | } | |
1661 | ||
1ba5c08b | 1662 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1663 | { |
1ba5c08b | 1664 | int ret = 0; |
80a3d1bb RR |
1665 | #ifdef CONFIG_MODULE_UNLOAD |
1666 | struct module_use *use; | |
1667 | ||
75676500 | 1668 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1669 | list_for_each_entry(use, &mod->target_list, target_list) { |
1670 | ret = sysfs_create_link(use->target->holders_dir, | |
1671 | &mod->mkobj.kobj, mod->name); | |
1672 | if (ret) | |
1673 | break; | |
1674 | } | |
75676500 | 1675 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1676 | if (ret) |
1677 | del_usage_links(mod); | |
80a3d1bb | 1678 | #endif |
1ba5c08b | 1679 | return ret; |
80a3d1bb RR |
1680 | } |
1681 | ||
6407ebb2 | 1682 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1683 | { |
1684 | struct module_attribute *attr; | |
03e88ae1 | 1685 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1686 | int error = 0; |
1687 | int i; | |
1688 | ||
03e88ae1 GKH |
1689 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1690 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1691 | GFP_KERNEL); | |
1692 | if (!mod->modinfo_attrs) | |
1693 | return -ENOMEM; | |
1694 | ||
1695 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 | 1696 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
c75b590d | 1697 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1698 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1699 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1700 | error = sysfs_create_file(&mod->mkobj.kobj, |
1701 | &temp_attr->attr); | |
03e88ae1 GKH |
1702 | ++temp_attr; |
1703 | } | |
c988d2b2 MD |
1704 | } |
1705 | return error; | |
1706 | } | |
1707 | ||
6407ebb2 | 1708 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1709 | { |
1710 | struct module_attribute *attr; | |
1711 | int i; | |
1712 | ||
03e88ae1 GKH |
1713 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1714 | /* pick a field to test for end of list */ | |
1715 | if (!attr->attr.name) | |
1716 | break; | |
6da0b565 | 1717 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1718 | if (attr->free) |
1719 | attr->free(mod); | |
c988d2b2 | 1720 | } |
03e88ae1 | 1721 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1722 | } |
1da177e4 | 1723 | |
942e4431 LZ |
1724 | static void mod_kobject_put(struct module *mod) |
1725 | { | |
1726 | DECLARE_COMPLETION_ONSTACK(c); | |
1727 | mod->mkobj.kobj_completion = &c; | |
1728 | kobject_put(&mod->mkobj.kobj); | |
1729 | wait_for_completion(&c); | |
1730 | } | |
1731 | ||
6407ebb2 | 1732 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1733 | { |
1734 | int err; | |
6494a93d | 1735 | struct kobject *kobj; |
1da177e4 | 1736 | |
823bccfc | 1737 | if (!module_sysfs_initialized) { |
bddb12b3 | 1738 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1739 | err = -EINVAL; |
1740 | goto out; | |
1741 | } | |
6494a93d GKH |
1742 | |
1743 | kobj = kset_find_obj(module_kset, mod->name); | |
1744 | if (kobj) { | |
bddb12b3 | 1745 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1746 | kobject_put(kobj); |
1747 | err = -EINVAL; | |
1748 | goto out; | |
1749 | } | |
1750 | ||
1da177e4 | 1751 | mod->mkobj.mod = mod; |
e17e0f51 | 1752 | |
ac3c8141 GKH |
1753 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1754 | mod->mkobj.kobj.kset = module_kset; | |
1755 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1756 | "%s", mod->name); | |
1757 | if (err) | |
942e4431 | 1758 | mod_kobject_put(mod); |
270a6c4c | 1759 | |
97c146ef | 1760 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1761 | out: |
1762 | return err; | |
1763 | } | |
1764 | ||
6407ebb2 | 1765 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1766 | const struct load_info *info, |
270a6c4c KS |
1767 | struct kernel_param *kparam, |
1768 | unsigned int num_params) | |
1769 | { | |
1770 | int err; | |
1771 | ||
80a3d1bb RR |
1772 | err = mod_sysfs_init(mod); |
1773 | if (err) | |
1774 | goto out; | |
1775 | ||
4ff6abff | 1776 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1777 | if (!mod->holders_dir) { |
1778 | err = -ENOMEM; | |
270a6c4c | 1779 | goto out_unreg; |
240936e1 | 1780 | } |
270a6c4c | 1781 | |
1da177e4 LT |
1782 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1783 | if (err) | |
270a6c4c | 1784 | goto out_unreg_holders; |
1da177e4 | 1785 | |
c988d2b2 MD |
1786 | err = module_add_modinfo_attrs(mod); |
1787 | if (err) | |
e17e0f51 | 1788 | goto out_unreg_param; |
c988d2b2 | 1789 | |
1ba5c08b CL |
1790 | err = add_usage_links(mod); |
1791 | if (err) | |
1792 | goto out_unreg_modinfo_attrs; | |
1793 | ||
8f6d0378 RR |
1794 | add_sect_attrs(mod, info); |
1795 | add_notes_attrs(mod, info); | |
80a3d1bb | 1796 | |
e17e0f51 | 1797 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1798 | return 0; |
1799 | ||
1ba5c08b CL |
1800 | out_unreg_modinfo_attrs: |
1801 | module_remove_modinfo_attrs(mod); | |
e17e0f51 KS |
1802 | out_unreg_param: |
1803 | module_param_sysfs_remove(mod); | |
270a6c4c | 1804 | out_unreg_holders: |
78a2d906 | 1805 | kobject_put(mod->holders_dir); |
270a6c4c | 1806 | out_unreg: |
942e4431 | 1807 | mod_kobject_put(mod); |
80a3d1bb | 1808 | out: |
1da177e4 LT |
1809 | return err; |
1810 | } | |
34e4e2fe DL |
1811 | |
1812 | static void mod_sysfs_fini(struct module *mod) | |
1813 | { | |
8f6d0378 RR |
1814 | remove_notes_attrs(mod); |
1815 | remove_sect_attrs(mod); | |
942e4431 | 1816 | mod_kobject_put(mod); |
34e4e2fe DL |
1817 | } |
1818 | ||
cf2fde7b RR |
1819 | static void init_param_lock(struct module *mod) |
1820 | { | |
1821 | mutex_init(&mod->param_lock); | |
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 | ||
cf2fde7b RR |
1845 | static void init_param_lock(struct module *mod) |
1846 | { | |
1847 | } | |
34e4e2fe | 1848 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1849 | |
36b0360d | 1850 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1851 | { |
80a3d1bb | 1852 | del_usage_links(mod); |
c988d2b2 | 1853 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1854 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1855 | kobject_put(mod->mkobj.drivers_dir); |
1856 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1857 | mod_sysfs_fini(mod); |
1da177e4 LT |
1858 | } |
1859 | ||
0f5bf6d0 | 1860 | #ifdef CONFIG_STRICT_MODULE_RWX |
84e1c6bb | 1861 | /* |
1862 | * LKM RO/NX protection: protect module's text/ro-data | |
1863 | * from modification and any data from execution. | |
85c898db RR |
1864 | * |
1865 | * General layout of module is: | |
444d13ff JY |
1866 | * [text] [read-only-data] [ro-after-init] [writable data] |
1867 | * text_size -----^ ^ ^ ^ | |
1868 | * ro_size ------------------------| | | | |
1869 | * ro_after_init_size -----------------------------| | | |
1870 | * size -----------------------------------------------------------| | |
85c898db RR |
1871 | * |
1872 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1873 | */ |
85c898db RR |
1874 | static void frob_text(const struct module_layout *layout, |
1875 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1876 | { |
85c898db RR |
1877 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1878 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1879 | set_memory((unsigned long)layout->base, | |
1880 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1881 | } |
84e1c6bb | 1882 | |
85c898db RR |
1883 | static void frob_rodata(const struct module_layout *layout, |
1884 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1885 | { |
85c898db RR |
1886 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1887 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1888 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1889 | set_memory((unsigned long)layout->base + layout->text_size, | |
1890 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb | 1891 | } |
1892 | ||
444d13ff JY |
1893 | static void frob_ro_after_init(const struct module_layout *layout, |
1894 | int (*set_memory)(unsigned long start, int num_pages)) | |
1895 | { | |
1896 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1897 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1898 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1899 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1900 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1901 | } | |
1902 | ||
85c898db RR |
1903 | static void frob_writable_data(const struct module_layout *layout, |
1904 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1905 | { |
85c898db | 1906 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1907 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1908 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1909 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1910 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1911 | } |
84e1c6bb | 1912 | |
85c898db RR |
1913 | /* livepatching wants to disable read-only so it can frob module. */ |
1914 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1915 | { |
39290b38 AT |
1916 | if (!rodata_enabled) |
1917 | return; | |
1918 | ||
85c898db RR |
1919 | frob_text(&mod->core_layout, set_memory_rw); |
1920 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 1921 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
1922 | frob_text(&mod->init_layout, set_memory_rw); |
1923 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1924 | } |
84e1c6bb | 1925 | |
444d13ff | 1926 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 1927 | { |
39290b38 AT |
1928 | if (!rodata_enabled) |
1929 | return; | |
1930 | ||
85c898db RR |
1931 | frob_text(&mod->core_layout, set_memory_ro); |
1932 | frob_rodata(&mod->core_layout, set_memory_ro); | |
1933 | frob_text(&mod->init_layout, set_memory_ro); | |
1934 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
1935 | |
1936 | if (after_init) | |
1937 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb | 1938 | } |
1939 | ||
85c898db | 1940 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 1941 | { |
85c898db | 1942 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 1943 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
1944 | frob_writable_data(&mod->core_layout, set_memory_nx); |
1945 | frob_rodata(&mod->init_layout, set_memory_nx); | |
1946 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
1947 | } |
1948 | ||
85c898db | 1949 | static void module_disable_nx(const struct module *mod) |
01526ed0 | 1950 | { |
85c898db | 1951 | frob_rodata(&mod->core_layout, set_memory_x); |
444d13ff | 1952 | frob_ro_after_init(&mod->core_layout, set_memory_x); |
85c898db RR |
1953 | frob_writable_data(&mod->core_layout, set_memory_x); |
1954 | frob_rodata(&mod->init_layout, set_memory_x); | |
1955 | frob_writable_data(&mod->init_layout, set_memory_x); | |
84e1c6bb | 1956 | } |
1957 | ||
1958 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1959 | void set_all_modules_text_rw(void) |
84e1c6bb | 1960 | { |
1961 | struct module *mod; | |
1962 | ||
39290b38 AT |
1963 | if (!rodata_enabled) |
1964 | return; | |
1965 | ||
84e1c6bb | 1966 | mutex_lock(&module_mutex); |
1967 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1968 | if (mod->state == MODULE_STATE_UNFORMED) |
1969 | continue; | |
85c898db RR |
1970 | |
1971 | frob_text(&mod->core_layout, set_memory_rw); | |
1972 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb | 1973 | } |
1974 | mutex_unlock(&module_mutex); | |
1975 | } | |
1976 | ||
1977 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1978 | void set_all_modules_text_ro(void) |
84e1c6bb | 1979 | { |
1980 | struct module *mod; | |
1981 | ||
39290b38 AT |
1982 | if (!rodata_enabled) |
1983 | return; | |
1984 | ||
84e1c6bb | 1985 | mutex_lock(&module_mutex); |
1986 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
1987 | /* |
1988 | * Ignore going modules since it's possible that ro | |
1989 | * protection has already been disabled, otherwise we'll | |
1990 | * run into protection faults at module deallocation. | |
1991 | */ | |
1992 | if (mod->state == MODULE_STATE_UNFORMED || | |
1993 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 1994 | continue; |
85c898db RR |
1995 | |
1996 | frob_text(&mod->core_layout, set_memory_ro); | |
1997 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb | 1998 | } |
1999 | mutex_unlock(&module_mutex); | |
2000 | } | |
85c898db RR |
2001 | |
2002 | static void disable_ro_nx(const struct module_layout *layout) | |
2003 | { | |
39290b38 AT |
2004 | if (rodata_enabled) { |
2005 | frob_text(layout, set_memory_rw); | |
2006 | frob_rodata(layout, set_memory_rw); | |
2007 | frob_ro_after_init(layout, set_memory_rw); | |
2008 | } | |
85c898db | 2009 | frob_rodata(layout, set_memory_x); |
444d13ff | 2010 | frob_ro_after_init(layout, set_memory_x); |
85c898db RR |
2011 | frob_writable_data(layout, set_memory_x); |
2012 | } | |
2013 | ||
84e1c6bb | 2014 | #else |
85c898db RR |
2015 | static void disable_ro_nx(const struct module_layout *layout) { } |
2016 | static void module_enable_nx(const struct module *mod) { } | |
2017 | static void module_disable_nx(const struct module *mod) { } | |
84e1c6bb | 2018 | #endif |
2019 | ||
1ce15ef4 JY |
2020 | #ifdef CONFIG_LIVEPATCH |
2021 | /* | |
2022 | * Persist Elf information about a module. Copy the Elf header, | |
2023 | * section header table, section string table, and symtab section | |
2024 | * index from info to mod->klp_info. | |
2025 | */ | |
2026 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2027 | { | |
2028 | unsigned int size, symndx; | |
2029 | int ret; | |
2030 | ||
2031 | size = sizeof(*mod->klp_info); | |
2032 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2033 | if (mod->klp_info == NULL) | |
2034 | return -ENOMEM; | |
2035 | ||
2036 | /* Elf header */ | |
2037 | size = sizeof(mod->klp_info->hdr); | |
2038 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2039 | ||
2040 | /* Elf section header table */ | |
2041 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2042 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2043 | if (mod->klp_info->sechdrs == NULL) { |
2044 | ret = -ENOMEM; | |
2045 | goto free_info; | |
2046 | } | |
1ce15ef4 JY |
2047 | |
2048 | /* Elf section name string table */ | |
2049 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2050 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2051 | if (mod->klp_info->secstrings == NULL) { |
2052 | ret = -ENOMEM; | |
2053 | goto free_sechdrs; | |
2054 | } | |
1ce15ef4 JY |
2055 | |
2056 | /* Elf symbol section index */ | |
2057 | symndx = info->index.sym; | |
2058 | mod->klp_info->symndx = symndx; | |
2059 | ||
2060 | /* | |
2061 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2062 | * copy of the original symbol table. Adjust sh_addr to point | |
2063 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2064 | * init memory is freed at the end of do_init_module(). | |
2065 | */ | |
2066 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2067 | (unsigned long) mod->core_kallsyms.symtab; | |
2068 | ||
2069 | return 0; | |
2070 | ||
2071 | free_sechdrs: | |
2072 | kfree(mod->klp_info->sechdrs); | |
2073 | free_info: | |
2074 | kfree(mod->klp_info); | |
2075 | return ret; | |
2076 | } | |
2077 | ||
2078 | static void free_module_elf(struct module *mod) | |
2079 | { | |
2080 | kfree(mod->klp_info->sechdrs); | |
2081 | kfree(mod->klp_info->secstrings); | |
2082 | kfree(mod->klp_info); | |
2083 | } | |
2084 | #else /* !CONFIG_LIVEPATCH */ | |
2085 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2086 | { | |
2087 | return 0; | |
2088 | } | |
2089 | ||
2090 | static void free_module_elf(struct module *mod) | |
2091 | { | |
2092 | } | |
2093 | #endif /* CONFIG_LIVEPATCH */ | |
2094 | ||
be1f221c | 2095 | void __weak module_memfree(void *module_region) |
74e08fcf JB |
2096 | { |
2097 | vfree(module_region); | |
2098 | } | |
2099 | ||
2100 | void __weak module_arch_cleanup(struct module *mod) | |
2101 | { | |
2102 | } | |
2103 | ||
d453cded RR |
2104 | void __weak module_arch_freeing_init(struct module *mod) |
2105 | { | |
2106 | } | |
2107 | ||
75676500 | 2108 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2109 | static void free_module(struct module *mod) |
2110 | { | |
7ead8b83 LZ |
2111 | trace_module_free(mod); |
2112 | ||
36b0360d | 2113 | mod_sysfs_teardown(mod); |
1da177e4 | 2114 | |
944a1fa0 RR |
2115 | /* We leave it in list to prevent duplicate loads, but make sure |
2116 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2117 | mutex_lock(&module_mutex); |
944a1fa0 | 2118 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2119 | mutex_unlock(&module_mutex); |
944a1fa0 | 2120 | |
b82bab4b JB |
2121 | /* Remove dynamic debug info */ |
2122 | ddebug_remove_module(mod->name); | |
2123 | ||
1da177e4 LT |
2124 | /* Arch-specific cleanup. */ |
2125 | module_arch_cleanup(mod); | |
2126 | ||
2127 | /* Module unload stuff */ | |
2128 | module_unload_free(mod); | |
2129 | ||
e180a6b7 RR |
2130 | /* Free any allocated parameters. */ |
2131 | destroy_params(mod->kp, mod->num_kp); | |
2132 | ||
1ce15ef4 JY |
2133 | if (is_livepatch_module(mod)) |
2134 | free_module_elf(mod); | |
2135 | ||
944a1fa0 RR |
2136 | /* Now we can delete it from the lists */ |
2137 | mutex_lock(&module_mutex); | |
461e34ae MH |
2138 | /* Unlink carefully: kallsyms could be walking list. */ |
2139 | list_del_rcu(&mod->list); | |
93c2e105 | 2140 | mod_tree_remove(mod); |
0286b5ea | 2141 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2142 | module_bug_cleanup(mod); |
0be964be PZ |
2143 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
2144 | synchronize_sched(); | |
944a1fa0 RR |
2145 | mutex_unlock(&module_mutex); |
2146 | ||
85c898db RR |
2147 | /* This may be empty, but that's OK */ |
2148 | disable_ro_nx(&mod->init_layout); | |
d453cded | 2149 | module_arch_freeing_init(mod); |
7523e4dc | 2150 | module_memfree(mod->init_layout.base); |
1da177e4 | 2151 | kfree(mod->args); |
259354de | 2152 | percpu_modfree(mod); |
9f85a4bb | 2153 | |
35a9393c | 2154 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2155 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2156 | |
1da177e4 | 2157 | /* Finally, free the core (containing the module structure) */ |
85c898db | 2158 | disable_ro_nx(&mod->core_layout); |
7523e4dc | 2159 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2160 | } |
2161 | ||
2162 | void *__symbol_get(const char *symbol) | |
2163 | { | |
2164 | struct module *owner; | |
414fd31b | 2165 | const struct kernel_symbol *sym; |
1da177e4 | 2166 | |
24da1cbf | 2167 | preempt_disable(); |
414fd31b TA |
2168 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2169 | if (sym && strong_try_module_get(owner)) | |
2170 | sym = NULL; | |
24da1cbf | 2171 | preempt_enable(); |
1da177e4 | 2172 | |
414fd31b | 2173 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
2174 | } |
2175 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2176 | ||
eea8b54d AN |
2177 | /* |
2178 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2179 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2180 | * |
2181 | * You must hold the module_mutex. | |
eea8b54d AN |
2182 | */ |
2183 | static int verify_export_symbols(struct module *mod) | |
2184 | { | |
b211104d | 2185 | unsigned int i; |
eea8b54d | 2186 | struct module *owner; |
b211104d RR |
2187 | const struct kernel_symbol *s; |
2188 | struct { | |
2189 | const struct kernel_symbol *sym; | |
2190 | unsigned int num; | |
2191 | } arr[] = { | |
2192 | { mod->syms, mod->num_syms }, | |
2193 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2194 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2195 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2196 | { mod->unused_syms, mod->num_unused_syms }, |
2197 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2198 | #endif |
b211104d | 2199 | }; |
eea8b54d | 2200 | |
b211104d RR |
2201 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2202 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 2203 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 2204 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
2205 | " (owned by %s)\n", |
2206 | mod->name, s->name, module_name(owner)); | |
2207 | return -ENOEXEC; | |
2208 | } | |
eea8b54d | 2209 | } |
b211104d RR |
2210 | } |
2211 | return 0; | |
eea8b54d AN |
2212 | } |
2213 | ||
9a4b9708 | 2214 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2215 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2216 | { | |
2217 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2218 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2219 | unsigned long secbase; |
49668688 | 2220 | unsigned int i; |
1da177e4 | 2221 | int ret = 0; |
414fd31b | 2222 | const struct kernel_symbol *ksym; |
1da177e4 | 2223 | |
49668688 RR |
2224 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2225 | const char *name = info->strtab + sym[i].st_name; | |
2226 | ||
1da177e4 LT |
2227 | switch (sym[i].st_shndx) { |
2228 | case SHN_COMMON: | |
80375980 JM |
2229 | /* Ignore common symbols */ |
2230 | if (!strncmp(name, "__gnu_lto", 9)) | |
2231 | break; | |
2232 | ||
1da177e4 LT |
2233 | /* We compiled with -fno-common. These are not |
2234 | supposed to happen. */ | |
5e124169 | 2235 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2236 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2237 | mod->name); |
2238 | ret = -ENOEXEC; | |
2239 | break; | |
2240 | ||
2241 | case SHN_ABS: | |
2242 | /* Don't need to do anything */ | |
5e124169 | 2243 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2244 | (long)sym[i].st_value); |
2245 | break; | |
2246 | ||
1ce15ef4 JY |
2247 | case SHN_LIVEPATCH: |
2248 | /* Livepatch symbols are resolved by livepatch */ | |
2249 | break; | |
2250 | ||
1da177e4 | 2251 | case SHN_UNDEF: |
49668688 | 2252 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2253 | /* Ok if resolved. */ |
9bea7f23 | 2254 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 2255 | sym[i].st_value = ksym->value; |
1da177e4 | 2256 | break; |
414fd31b TA |
2257 | } |
2258 | ||
1da177e4 | 2259 | /* Ok if weak. */ |
9bea7f23 | 2260 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2261 | break; |
2262 | ||
9bea7f23 | 2263 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2264 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2265 | mod->name, name, ret); | |
1da177e4 LT |
2266 | break; |
2267 | ||
2268 | default: | |
2269 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2270 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2271 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2272 | else |
49668688 | 2273 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2274 | sym[i].st_value += secbase; |
2275 | break; | |
2276 | } | |
2277 | } | |
2278 | ||
2279 | return ret; | |
2280 | } | |
2281 | ||
49668688 | 2282 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2283 | { |
2284 | unsigned int i; | |
2285 | int err = 0; | |
2286 | ||
2287 | /* Now do relocations. */ | |
49668688 RR |
2288 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2289 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2290 | |
2291 | /* Not a valid relocation section? */ | |
49668688 | 2292 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2293 | continue; |
2294 | ||
2295 | /* Don't bother with non-allocated sections */ | |
49668688 | 2296 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2297 | continue; |
2298 | ||
1ce15ef4 JY |
2299 | /* Livepatch relocation sections are applied by livepatch */ |
2300 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2301 | continue; | |
2302 | ||
49668688 RR |
2303 | if (info->sechdrs[i].sh_type == SHT_REL) |
2304 | err = apply_relocate(info->sechdrs, info->strtab, | |
2305 | info->index.sym, i, mod); | |
2306 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2307 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2308 | info->index.sym, i, mod); | |
22e268eb RR |
2309 | if (err < 0) |
2310 | break; | |
2311 | } | |
2312 | return err; | |
2313 | } | |
2314 | ||
088af9a6 HD |
2315 | /* Additional bytes needed by arch in front of individual sections */ |
2316 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2317 | unsigned int section) | |
2318 | { | |
2319 | /* default implementation just returns zero */ | |
2320 | return 0; | |
2321 | } | |
2322 | ||
1da177e4 | 2323 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2324 | static long get_offset(struct module *mod, unsigned int *size, |
2325 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2326 | { |
2327 | long ret; | |
2328 | ||
088af9a6 | 2329 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2330 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2331 | *size = ret + sechdr->sh_size; | |
2332 | return ret; | |
2333 | } | |
2334 | ||
2335 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2336 | might -- code, read-only data, read-write data, small data. Tally | |
2337 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2338 | belongs in init. */ | |
49668688 | 2339 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2340 | { |
2341 | static unsigned long const masks[][2] = { | |
2342 | /* NOTE: all executable code must be the first section | |
2343 | * in this array; otherwise modify the text_size | |
2344 | * finder in the two loops below */ | |
2345 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2346 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2347 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2348 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2349 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2350 | }; | |
2351 | unsigned int m, i; | |
2352 | ||
49668688 RR |
2353 | for (i = 0; i < info->hdr->e_shnum; i++) |
2354 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2355 | |
5e124169 | 2356 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2357 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2358 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2359 | Elf_Shdr *s = &info->sechdrs[i]; | |
2360 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2361 | |
2362 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2363 | || (s->sh_flags & masks[m][1]) | |
2364 | || s->sh_entsize != ~0UL | |
49668688 | 2365 | || strstarts(sname, ".init")) |
1da177e4 | 2366 | continue; |
7523e4dc | 2367 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2368 | pr_debug("\t%s\n", sname); |
1da177e4 | 2369 | } |
84e1c6bb | 2370 | switch (m) { |
2371 | case 0: /* executable */ | |
7523e4dc RR |
2372 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2373 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb | 2374 | break; |
2375 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2376 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2377 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2378 | break; |
444d13ff JY |
2379 | case 2: /* RO after init */ |
2380 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2381 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2382 | break; | |
2383 | case 4: /* whole core */ | |
7523e4dc | 2384 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb | 2385 | break; |
2386 | } | |
1da177e4 LT |
2387 | } |
2388 | ||
5e124169 | 2389 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2390 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2391 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2392 | Elf_Shdr *s = &info->sechdrs[i]; | |
2393 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2394 | |
2395 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2396 | || (s->sh_flags & masks[m][1]) | |
2397 | || s->sh_entsize != ~0UL | |
49668688 | 2398 | || !strstarts(sname, ".init")) |
1da177e4 | 2399 | continue; |
7523e4dc | 2400 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2401 | | INIT_OFFSET_MASK); |
5e124169 | 2402 | pr_debug("\t%s\n", sname); |
1da177e4 | 2403 | } |
84e1c6bb | 2404 | switch (m) { |
2405 | case 0: /* executable */ | |
7523e4dc RR |
2406 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2407 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb | 2408 | break; |
2409 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2410 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2411 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2412 | break; |
444d13ff JY |
2413 | case 2: |
2414 | /* | |
2415 | * RO after init doesn't apply to init_layout (only | |
2416 | * core_layout), so it just takes the value of ro_size. | |
2417 | */ | |
2418 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2419 | break; | |
2420 | case 4: /* whole init */ | |
7523e4dc | 2421 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb | 2422 | break; |
2423 | } | |
1da177e4 LT |
2424 | } |
2425 | } | |
2426 | ||
1da177e4 LT |
2427 | static void set_license(struct module *mod, const char *license) |
2428 | { | |
2429 | if (!license) | |
2430 | license = "unspecified"; | |
2431 | ||
fa3ba2e8 | 2432 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2433 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2434 | pr_warn("%s: module license '%s' taints kernel.\n", |
2435 | mod->name, license); | |
373d4d09 RR |
2436 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2437 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2438 | } |
2439 | } | |
2440 | ||
2441 | /* Parse tag=value strings from .modinfo section */ | |
2442 | static char *next_string(char *string, unsigned long *secsize) | |
2443 | { | |
2444 | /* Skip non-zero chars */ | |
2445 | while (string[0]) { | |
2446 | string++; | |
2447 | if ((*secsize)-- <= 1) | |
2448 | return NULL; | |
2449 | } | |
2450 | ||
2451 | /* Skip any zero padding. */ | |
2452 | while (!string[0]) { | |
2453 | string++; | |
2454 | if ((*secsize)-- <= 1) | |
2455 | return NULL; | |
2456 | } | |
2457 | return string; | |
2458 | } | |
2459 | ||
49668688 | 2460 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2461 | { |
2462 | char *p; | |
2463 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2464 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2465 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2466 | |
5fdc7db6 JY |
2467 | /* |
2468 | * get_modinfo() calls made before rewrite_section_headers() | |
2469 | * must use sh_offset, as sh_addr isn't set! | |
2470 | */ | |
2471 | for (p = (char *)info->hdr + infosec->sh_offset; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2472 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2473 | return p + taglen + 1; | |
2474 | } | |
2475 | return NULL; | |
2476 | } | |
2477 | ||
49668688 | 2478 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2479 | { |
2480 | struct module_attribute *attr; | |
2481 | int i; | |
2482 | ||
2483 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2484 | if (attr->setup) | |
49668688 | 2485 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2486 | } |
2487 | } | |
c988d2b2 | 2488 | |
a263f776 RR |
2489 | static void free_modinfo(struct module *mod) |
2490 | { | |
2491 | struct module_attribute *attr; | |
2492 | int i; | |
2493 | ||
2494 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2495 | if (attr->free) | |
2496 | attr->free(mod); | |
2497 | } | |
2498 | } | |
2499 | ||
1da177e4 | 2500 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2501 | |
2502 | /* lookup symbol in given range of kernel_symbols */ | |
2503 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2504 | const struct kernel_symbol *start, | |
2505 | const struct kernel_symbol *stop) | |
2506 | { | |
9d63487f AIB |
2507 | return bsearch(name, start, stop - start, |
2508 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2509 | } |
2510 | ||
ca4787b7 TA |
2511 | static int is_exported(const char *name, unsigned long value, |
2512 | const struct module *mod) | |
1da177e4 | 2513 | { |
ca4787b7 TA |
2514 | const struct kernel_symbol *ks; |
2515 | if (!mod) | |
2516 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2517 | else |
ca4787b7 TA |
2518 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2519 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2520 | } |
2521 | ||
2522 | /* As per nm */ | |
eded41c1 | 2523 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2524 | { |
eded41c1 RR |
2525 | const Elf_Shdr *sechdrs = info->sechdrs; |
2526 | ||
1da177e4 LT |
2527 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2528 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2529 | return 'v'; | |
2530 | else | |
2531 | return 'w'; | |
2532 | } | |
2533 | if (sym->st_shndx == SHN_UNDEF) | |
2534 | return 'U'; | |
e0224418 | 2535 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2536 | return 'a'; |
2537 | if (sym->st_shndx >= SHN_LORESERVE) | |
2538 | return '?'; | |
2539 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2540 | return 't'; | |
2541 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2542 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2543 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2544 | return 'r'; | |
2545 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2546 | return 'g'; | |
2547 | else | |
2548 | return 'd'; | |
2549 | } | |
2550 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2551 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2552 | return 's'; | |
2553 | else | |
2554 | return 'b'; | |
2555 | } | |
eded41c1 RR |
2556 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2557 | ".debug")) { | |
1da177e4 | 2558 | return 'n'; |
eded41c1 | 2559 | } |
1da177e4 LT |
2560 | return '?'; |
2561 | } | |
2562 | ||
4a496226 | 2563 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2564 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2565 | { |
2566 | const Elf_Shdr *sec; | |
2567 | ||
2568 | if (src->st_shndx == SHN_UNDEF | |
2569 | || src->st_shndx >= shnum | |
2570 | || !src->st_name) | |
2571 | return false; | |
2572 | ||
e0224418 MB |
2573 | #ifdef CONFIG_KALLSYMS_ALL |
2574 | if (src->st_shndx == pcpundx) | |
2575 | return true; | |
2576 | #endif | |
2577 | ||
4a496226 JB |
2578 | sec = sechdrs + src->st_shndx; |
2579 | if (!(sec->sh_flags & SHF_ALLOC) | |
2580 | #ifndef CONFIG_KALLSYMS_ALL | |
2581 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2582 | #endif | |
2583 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2584 | return false; | |
2585 | ||
2586 | return true; | |
2587 | } | |
2588 | ||
48fd1188 KC |
2589 | /* |
2590 | * We only allocate and copy the strings needed by the parts of symtab | |
2591 | * we keep. This is simple, but has the effect of making multiple | |
2592 | * copies of duplicates. We could be more sophisticated, see | |
2593 | * linux-kernel thread starting with | |
2594 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2595 | */ | |
49668688 | 2596 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2597 | { |
49668688 RR |
2598 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2599 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2600 | const Elf_Sym *src; |
54523ec7 | 2601 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2602 | |
2603 | /* Put symbol section at end of init part of module. */ | |
2604 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2605 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2606 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2607 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2608 | |
49668688 | 2609 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2610 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2611 | |
48fd1188 | 2612 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2613 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2614 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2615 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2616 | info->index.pcpu)) { | |
59ef28b1 | 2617 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2618 | ndst++; |
554bdfe5 | 2619 | } |
59ef28b1 | 2620 | } |
4a496226 JB |
2621 | |
2622 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2623 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2624 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2625 | mod->core_layout.size += strtab_size; | |
2626 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
4a496226 | 2627 | |
554bdfe5 JB |
2628 | /* Put string table section at end of init part of module. */ |
2629 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2630 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2631 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2632 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2633 | |
2634 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2635 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2636 | __alignof__(struct mod_kallsyms)); | |
2637 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2638 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
2639 | mod->init_layout.size = debug_align(mod->init_layout.size); | |
4a496226 JB |
2640 | } |
2641 | ||
8244062e RR |
2642 | /* |
2643 | * We use the full symtab and strtab which layout_symtab arranged to | |
2644 | * be appended to the init section. Later we switch to the cut-down | |
2645 | * core-only ones. | |
2646 | */ | |
811d66a0 | 2647 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2648 | { |
4a496226 JB |
2649 | unsigned int i, ndst; |
2650 | const Elf_Sym *src; | |
2651 | Elf_Sym *dst; | |
554bdfe5 | 2652 | char *s; |
eded41c1 | 2653 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2654 | |
8244062e RR |
2655 | /* Set up to point into init section. */ |
2656 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2657 | ||
2658 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2659 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2660 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2661 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1da177e4 LT |
2662 | |
2663 | /* Set types up while we still have access to sections. */ | |
8244062e RR |
2664 | for (i = 0; i < mod->kallsyms->num_symtab; i++) |
2665 | mod->kallsyms->symtab[i].st_info | |
2666 | = elf_type(&mod->kallsyms->symtab[i], info); | |
2667 | ||
2668 | /* Now populate the cut down core kallsyms for after init. */ | |
2669 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; | |
2670 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
2671 | src = mod->kallsyms->symtab; | |
2672 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1ce15ef4 | 2673 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2674 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2675 | info->index.pcpu)) { | |
59ef28b1 | 2676 | dst[ndst] = src[i]; |
8244062e RR |
2677 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2678 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2679 | KSYM_NAME_LEN) + 1; |
2680 | } | |
4a496226 | 2681 | } |
8244062e | 2682 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2683 | } |
2684 | #else | |
49668688 | 2685 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2686 | { |
2687 | } | |
3ae91c21 | 2688 | |
abbce906 | 2689 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2690 | { |
2691 | } | |
2692 | #endif /* CONFIG_KALLSYMS */ | |
2693 | ||
52796312 | 2694 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2695 | { |
811d66a0 RR |
2696 | if (!debug) |
2697 | return; | |
e9d376f0 | 2698 | #ifdef CONFIG_DYNAMIC_DEBUG |
52796312 | 2699 | if (ddebug_add_module(debug, num, mod->name)) |
bddb12b3 AM |
2700 | pr_err("dynamic debug error adding module: %s\n", |
2701 | debug->modname); | |
e9d376f0 | 2702 | #endif |
5e458cc0 | 2703 | } |
346e15be | 2704 | |
52796312 | 2705 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2706 | { |
2707 | if (debug) | |
52796312 | 2708 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2709 | } |
2710 | ||
74e08fcf JB |
2711 | void * __weak module_alloc(unsigned long size) |
2712 | { | |
82fab442 | 2713 | return vmalloc_exec(size); |
74e08fcf JB |
2714 | } |
2715 | ||
4f2294b6 | 2716 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2717 | static void kmemleak_load_module(const struct module *mod, |
2718 | const struct load_info *info) | |
4f2294b6 CM |
2719 | { |
2720 | unsigned int i; | |
2721 | ||
2722 | /* only scan the sections containing data */ | |
c017b4be | 2723 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2724 | |
49668688 | 2725 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2726 | /* Scan all writable sections that's not executable */ |
2727 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2728 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2729 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2730 | continue; |
2731 | ||
49668688 RR |
2732 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2733 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2734 | } |
2735 | } | |
2736 | #else | |
49668688 RR |
2737 | static inline void kmemleak_load_module(const struct module *mod, |
2738 | const struct load_info *info) | |
4f2294b6 CM |
2739 | { |
2740 | } | |
2741 | #endif | |
2742 | ||
106a4ee2 | 2743 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2744 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2745 | { |
2746 | int err = -ENOKEY; | |
34e1169d KC |
2747 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2748 | const void *mod = info->hdr; | |
caabe240 | 2749 | |
bca014ca BH |
2750 | /* |
2751 | * Require flags == 0, as a module with version information | |
2752 | * removed is no longer the module that was signed | |
2753 | */ | |
2754 | if (flags == 0 && | |
2755 | info->len > markerlen && | |
34e1169d | 2756 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2757 | /* We truncate the module to discard the signature */ |
34e1169d | 2758 | info->len -= markerlen; |
f314dfea | 2759 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2760 | } |
2761 | ||
2762 | if (!err) { | |
2763 | info->sig_ok = true; | |
2764 | return 0; | |
2765 | } | |
2766 | ||
2767 | /* Not having a signature is only an error if we're strict. */ | |
2c8fd268 | 2768 | if (err == -ENOKEY && !is_module_sig_enforced()) |
106a4ee2 RR |
2769 | err = 0; |
2770 | ||
2771 | return err; | |
2772 | } | |
2773 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2774 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2775 | { |
2776 | return 0; | |
2777 | } | |
2778 | #endif /* !CONFIG_MODULE_SIG */ | |
2779 | ||
34e1169d KC |
2780 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2781 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2782 | { |
34e1169d KC |
2783 | if (info->len < sizeof(*(info->hdr))) |
2784 | return -ENOEXEC; | |
2785 | ||
2786 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2787 | || info->hdr->e_type != ET_REL | |
2788 | || !elf_check_arch(info->hdr) | |
2789 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2790 | return -ENOEXEC; | |
2791 | ||
2792 | if (info->hdr->e_shoff >= info->len | |
2793 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2794 | info->len - info->hdr->e_shoff)) | |
2795 | return -ENOEXEC; | |
40dd2560 | 2796 | |
34e1169d KC |
2797 | return 0; |
2798 | } | |
2799 | ||
3afe9f84 LT |
2800 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2801 | ||
2802 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2803 | { | |
2804 | do { | |
2805 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2806 | ||
2807 | if (copy_from_user(dst, usrc, n) != 0) | |
2808 | return -EFAULT; | |
2809 | cond_resched(); | |
2810 | dst += n; | |
2811 | usrc += n; | |
2812 | len -= n; | |
2813 | } while (len); | |
2814 | return 0; | |
2815 | } | |
2816 | ||
1ce15ef4 | 2817 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2818 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2819 | { |
2992ef29 JP |
2820 | if (get_modinfo(info, "livepatch")) { |
2821 | mod->klp = true; | |
2822 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2823 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2824 | mod->name); | |
2992ef29 | 2825 | } |
1ce15ef4 JY |
2826 | |
2827 | return 0; | |
2828 | } | |
2829 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2830 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2831 | { |
2832 | if (get_modinfo(info, "livepatch")) { | |
2833 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2834 | mod->name); | |
2835 | return -ENOEXEC; | |
2836 | } | |
2837 | ||
2838 | return 0; | |
2839 | } | |
2840 | #endif /* CONFIG_LIVEPATCH */ | |
2841 | ||
caf7501a AK |
2842 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2843 | { | |
2844 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2845 | return; | |
2846 | ||
2847 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2848 | mod->name); | |
2849 | } | |
2850 | ||
34e1169d KC |
2851 | /* Sets info->hdr and info->len. */ |
2852 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2853 | struct load_info *info) | |
40dd2560 RR |
2854 | { |
2855 | int err; | |
40dd2560 | 2856 | |
34e1169d KC |
2857 | info->len = len; |
2858 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2859 | return -ENOEXEC; |
2860 | ||
c77b8cdf | 2861 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2862 | if (err) |
2863 | return err; | |
2864 | ||
40dd2560 | 2865 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2866 | info->hdr = __vmalloc(info->len, |
19809c2d | 2867 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2868 | if (!info->hdr) |
40dd2560 RR |
2869 | return -ENOMEM; |
2870 | ||
3afe9f84 | 2871 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2872 | vfree(info->hdr); |
2873 | return -EFAULT; | |
40dd2560 RR |
2874 | } |
2875 | ||
34e1169d KC |
2876 | return 0; |
2877 | } | |
2878 | ||
d913188c RR |
2879 | static void free_copy(struct load_info *info) |
2880 | { | |
d913188c RR |
2881 | vfree(info->hdr); |
2882 | } | |
2883 | ||
2f3238ae | 2884 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2885 | { |
2886 | unsigned int i; | |
2887 | ||
2888 | /* This should always be true, but let's be sure. */ | |
2889 | info->sechdrs[0].sh_addr = 0; | |
2890 | ||
2891 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2892 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2893 | if (shdr->sh_type != SHT_NOBITS | |
2894 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2895 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2896 | return -ENOEXEC; |
2897 | } | |
2898 | ||
2899 | /* Mark all sections sh_addr with their address in the | |
2900 | temporary image. */ | |
2901 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2902 | ||
2903 | #ifndef CONFIG_MODULE_UNLOAD | |
2904 | /* Don't load .exit sections */ | |
2905 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2906 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2907 | #endif | |
8b5f61a7 | 2908 | } |
d6df72a0 RR |
2909 | |
2910 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 2911 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 2912 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 2913 | |
8b5f61a7 RR |
2914 | return 0; |
2915 | } | |
2916 | ||
3264d3f9 LT |
2917 | /* |
2918 | * Set up our basic convenience variables (pointers to section headers, | |
2919 | * search for module section index etc), and do some basic section | |
2920 | * verification. | |
2921 | * | |
81a0abd9 JY |
2922 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
2923 | * will be allocated in move_module(). | |
3264d3f9 | 2924 | */ |
81a0abd9 | 2925 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2926 | { |
2927 | unsigned int i; | |
3264d3f9 LT |
2928 | |
2929 | /* Set up the convenience variables */ | |
2930 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2931 | info->secstrings = (void *)info->hdr |
2932 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2933 | |
5fdc7db6 JY |
2934 | /* Try to find a name early so we can log errors with a module name */ |
2935 | info->index.info = find_sec(info, ".modinfo"); | |
2936 | if (!info->index.info) | |
2937 | info->name = "(missing .modinfo section)"; | |
2938 | else | |
2939 | info->name = get_modinfo(info, "name"); | |
3264d3f9 | 2940 | |
8b5f61a7 RR |
2941 | /* Find internal symbols and strings. */ |
2942 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2943 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2944 | info->index.sym = i; | |
2945 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2946 | info->strtab = (char *)info->hdr |
2947 | + info->sechdrs[info->index.str].sh_offset; | |
2948 | break; | |
3264d3f9 | 2949 | } |
3264d3f9 LT |
2950 | } |
2951 | ||
5fdc7db6 JY |
2952 | if (info->index.sym == 0) { |
2953 | pr_warn("%s: module has no symbols (stripped?)\n", info->name); | |
2954 | return -ENOEXEC; | |
2955 | } | |
2956 | ||
49668688 | 2957 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2958 | if (!info->index.mod) { |
3e2e857f KC |
2959 | pr_warn("%s: No module found in object\n", |
2960 | info->name ?: "(missing .modinfo name field)"); | |
81a0abd9 | 2961 | return -ENOEXEC; |
3264d3f9 LT |
2962 | } |
2963 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 2964 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 2965 | |
3e2e857f | 2966 | /* |
5fdc7db6 | 2967 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
2968 | * on-disk struct mod 'name' field. |
2969 | */ | |
2970 | if (!info->name) | |
81a0abd9 | 2971 | info->name = info->mod->name; |
3e2e857f | 2972 | |
5fdc7db6 JY |
2973 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2974 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2975 | else | |
2976 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 2977 | |
49668688 | 2978 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2979 | |
81a0abd9 | 2980 | return 0; |
3264d3f9 LT |
2981 | } |
2982 | ||
2f3238ae | 2983 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2984 | { |
49668688 | 2985 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2986 | int err; |
2987 | ||
2f3238ae RR |
2988 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2989 | modmagic = NULL; | |
2990 | ||
40dd2560 RR |
2991 | /* This is allowed: modprobe --force will invalidate it. */ |
2992 | if (!modmagic) { | |
2993 | err = try_to_force_load(mod, "bad vermagic"); | |
2994 | if (err) | |
2995 | return err; | |
49668688 | 2996 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 2997 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 2998 | info->name, modmagic, vermagic); |
40dd2560 RR |
2999 | return -ENOEXEC; |
3000 | } | |
3001 | ||
3205c36c LP |
3002 | if (!get_modinfo(info, "intree")) { |
3003 | if (!test_taint(TAINT_OOT_MODULE)) | |
3004 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3005 | mod->name); | |
373d4d09 | 3006 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3007 | } |
2449b8ba | 3008 | |
caf7501a AK |
3009 | check_modinfo_retpoline(mod, info); |
3010 | ||
49668688 | 3011 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3012 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3013 | pr_warn("%s: module is from the staging directory, the quality " |
3014 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3015 | } |
22e268eb | 3016 | |
2992ef29 | 3017 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3018 | if (err) |
3019 | return err; | |
3020 | ||
22e268eb | 3021 | /* Set up license info based on the info section */ |
49668688 | 3022 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3023 | |
40dd2560 RR |
3024 | return 0; |
3025 | } | |
3026 | ||
eb3057df | 3027 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3028 | { |
49668688 | 3029 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3030 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3031 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3032 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3033 | mod->crcs = section_addr(info, "__kcrctab"); |
3034 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3035 | sizeof(*mod->gpl_syms), |
3036 | &mod->num_gpl_syms); | |
49668688 RR |
3037 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3038 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3039 | "__ksymtab_gpl_future", |
3040 | sizeof(*mod->gpl_future_syms), | |
3041 | &mod->num_gpl_future_syms); | |
49668688 | 3042 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3043 | |
3044 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3045 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3046 | sizeof(*mod->unused_syms), |
3047 | &mod->num_unused_syms); | |
49668688 RR |
3048 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3049 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3050 | sizeof(*mod->unused_gpl_syms), |
3051 | &mod->num_unused_gpl_syms); | |
49668688 | 3052 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3053 | #endif |
3054 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3055 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3056 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3057 | if (!mod->ctors) |
3058 | mod->ctors = section_objs(info, ".init_array", | |
3059 | sizeof(*mod->ctors), &mod->num_ctors); | |
3060 | else if (find_sec(info, ".init_array")) { | |
3061 | /* | |
3062 | * This shouldn't happen with same compiler and binutils | |
3063 | * building all parts of the module. | |
3064 | */ | |
6da0b565 | 3065 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3066 | mod->name); |
3067 | return -EINVAL; | |
3068 | } | |
f91a13bb LT |
3069 | #endif |
3070 | ||
3071 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3072 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3073 | sizeof(*mod->tracepoints_ptrs), | |
3074 | &mod->num_tracepoints); | |
f91a13bb | 3075 | #endif |
bf5438fc JB |
3076 | #ifdef HAVE_JUMP_LABEL |
3077 | mod->jump_entries = section_objs(info, "__jump_table", | |
3078 | sizeof(*mod->jump_entries), | |
3079 | &mod->num_jump_entries); | |
3080 | #endif | |
f91a13bb | 3081 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3082 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3083 | sizeof(*mod->trace_events), |
3084 | &mod->num_trace_events); | |
99be647c JL |
3085 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3086 | sizeof(*mod->trace_evals), | |
3087 | &mod->num_trace_evals); | |
f91a13bb | 3088 | #endif |
13b9b6e7 SR |
3089 | #ifdef CONFIG_TRACING |
3090 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3091 | sizeof(*mod->trace_bprintk_fmt_start), | |
3092 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3093 | #endif |
f91a13bb LT |
3094 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3095 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3096 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3097 | sizeof(*mod->ftrace_callsites), |
3098 | &mod->num_ftrace_callsites); | |
3099 | #endif | |
540adea3 MH |
3100 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3101 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3102 | sizeof(*mod->ei_funcs), | |
3103 | &mod->num_ei_funcs); | |
92ace999 | 3104 | #endif |
811d66a0 RR |
3105 | mod->extable = section_objs(info, "__ex_table", |
3106 | sizeof(*mod->extable), &mod->num_exentries); | |
3107 | ||
49668688 | 3108 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3109 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3110 | |
3111 | info->debug = section_objs(info, "__verbose", | |
3112 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3113 | |
3114 | return 0; | |
f91a13bb LT |
3115 | } |
3116 | ||
49668688 | 3117 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3118 | { |
3119 | int i; | |
3120 | void *ptr; | |
3121 | ||
3122 | /* Do the allocs. */ | |
7523e4dc | 3123 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3124 | /* |
3125 | * The pointer to this block is stored in the module structure | |
3126 | * which is inside the block. Just mark it as not being a | |
3127 | * leak. | |
3128 | */ | |
3129 | kmemleak_not_leak(ptr); | |
3130 | if (!ptr) | |
d913188c | 3131 | return -ENOMEM; |
65b8a9b4 | 3132 | |
7523e4dc RR |
3133 | memset(ptr, 0, mod->core_layout.size); |
3134 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3135 | |
7523e4dc RR |
3136 | if (mod->init_layout.size) { |
3137 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3138 | /* |
3139 | * The pointer to this block is stored in the module structure | |
3140 | * which is inside the block. This block doesn't need to be | |
3141 | * scanned as it contains data and code that will be freed | |
3142 | * after the module is initialized. | |
3143 | */ | |
3144 | kmemleak_ignore(ptr); | |
3145 | if (!ptr) { | |
7523e4dc | 3146 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3147 | return -ENOMEM; |
3148 | } | |
7523e4dc RR |
3149 | memset(ptr, 0, mod->init_layout.size); |
3150 | mod->init_layout.base = ptr; | |
82fab442 | 3151 | } else |
7523e4dc | 3152 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3153 | |
3154 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3155 | pr_debug("final section addresses:\n"); |
49668688 | 3156 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3157 | void *dest; |
49668688 | 3158 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3159 | |
49668688 | 3160 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3161 | continue; |
3162 | ||
49668688 | 3163 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3164 | dest = mod->init_layout.base |
49668688 | 3165 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3166 | else |
7523e4dc | 3167 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3168 | |
49668688 RR |
3169 | if (shdr->sh_type != SHT_NOBITS) |
3170 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3171 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3172 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3173 | pr_debug("\t0x%lx %s\n", |
3174 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3175 | } |
d913188c RR |
3176 | |
3177 | return 0; | |
65b8a9b4 LT |
3178 | } |
3179 | ||
49668688 | 3180 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3181 | { |
3205c36c LP |
3182 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3183 | ||
22e268eb RR |
3184 | /* |
3185 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3186 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3187 | * using GPL-only symbols it needs. | |
3188 | */ | |
3189 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3190 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3191 | |
3192 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3193 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3194 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3195 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3196 | |
c99af375 MG |
3197 | /* lve claims to be GPL but upstream won't provide source */ |
3198 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3199 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3200 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3201 | |
3205c36c LP |
3202 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3203 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3204 | ||
22e268eb RR |
3205 | #ifdef CONFIG_MODVERSIONS |
3206 | if ((mod->num_syms && !mod->crcs) | |
3207 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3208 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3209 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3210 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3211 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3212 | #endif | |
3213 | ) { | |
3214 | return try_to_force_load(mod, | |
3215 | "no versions for exported symbols"); | |
3216 | } | |
3217 | #endif | |
3218 | return 0; | |
3219 | } | |
3220 | ||
3221 | static void flush_module_icache(const struct module *mod) | |
3222 | { | |
3223 | mm_segment_t old_fs; | |
3224 | ||
3225 | /* flush the icache in correct context */ | |
3226 | old_fs = get_fs(); | |
3227 | set_fs(KERNEL_DS); | |
3228 | ||
3229 | /* | |
3230 | * Flush the instruction cache, since we've played with text. | |
3231 | * Do it before processing of module parameters, so the module | |
3232 | * can provide parameter accessor functions of its own. | |
3233 | */ | |
7523e4dc RR |
3234 | if (mod->init_layout.base) |
3235 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3236 | (unsigned long)mod->init_layout.base | |
3237 | + mod->init_layout.size); | |
3238 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3239 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3240 | |
3241 | set_fs(old_fs); | |
3242 | } | |
3243 | ||
74e08fcf JB |
3244 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3245 | Elf_Shdr *sechdrs, | |
3246 | char *secstrings, | |
3247 | struct module *mod) | |
3248 | { | |
3249 | return 0; | |
3250 | } | |
3251 | ||
be7de5f9 PB |
3252 | /* module_blacklist is a comma-separated list of module names */ |
3253 | static char *module_blacklist; | |
96b5b194 | 3254 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3255 | { |
3256 | const char *p; | |
3257 | size_t len; | |
3258 | ||
3259 | if (!module_blacklist) | |
3260 | return false; | |
3261 | ||
3262 | for (p = module_blacklist; *p; p += len) { | |
3263 | len = strcspn(p, ","); | |
3264 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3265 | return true; | |
3266 | if (p[len] == ',') | |
3267 | len++; | |
3268 | } | |
3269 | return false; | |
3270 | } | |
3271 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3272 | ||
2f3238ae | 3273 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3274 | { |
1da177e4 | 3275 | struct module *mod; |
444d13ff | 3276 | unsigned int ndx; |
d913188c | 3277 | int err; |
3ae91c21 | 3278 | |
81a0abd9 | 3279 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3280 | if (err) |
3281 | return ERR_PTR(err); | |
1da177e4 | 3282 | |
1da177e4 | 3283 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3284 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3285 | info->secstrings, info->mod); |
1da177e4 | 3286 | if (err < 0) |
8d8022e8 | 3287 | return ERR_PTR(err); |
1da177e4 | 3288 | |
8d8022e8 RR |
3289 | /* We will do a special allocation for per-cpu sections later. */ |
3290 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3291 | |
444d13ff JY |
3292 | /* |
3293 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3294 | * layout_sections() can put it in the right place. | |
3295 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3296 | */ | |
3297 | ndx = find_sec(info, ".data..ro_after_init"); | |
3298 | if (ndx) | |
3299 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3300 | ||
1da177e4 LT |
3301 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3302 | this is done generically; there doesn't appear to be any | |
3303 | special cases for the architectures. */ | |
81a0abd9 JY |
3304 | layout_sections(info->mod, info); |
3305 | layout_symtab(info->mod, info); | |
1da177e4 | 3306 | |
65b8a9b4 | 3307 | /* Allocate and move to the final place */ |
81a0abd9 | 3308 | err = move_module(info->mod, info); |
d913188c | 3309 | if (err) |
8d8022e8 | 3310 | return ERR_PTR(err); |
d913188c RR |
3311 | |
3312 | /* Module has been copied to its final place now: return it. */ | |
3313 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3314 | kmemleak_load_module(mod, info); |
d913188c | 3315 | return mod; |
d913188c RR |
3316 | } |
3317 | ||
3318 | /* mod is no longer valid after this! */ | |
3319 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3320 | { | |
d913188c | 3321 | percpu_modfree(mod); |
d453cded | 3322 | module_arch_freeing_init(mod); |
7523e4dc RR |
3323 | module_memfree(mod->init_layout.base); |
3324 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3325 | } |
3326 | ||
74e08fcf JB |
3327 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3328 | const Elf_Shdr *sechdrs, | |
3329 | struct module *me) | |
3330 | { | |
3331 | return 0; | |
3332 | } | |
3333 | ||
811d66a0 RR |
3334 | static int post_relocation(struct module *mod, const struct load_info *info) |
3335 | { | |
51f3d0f4 | 3336 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3337 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3338 | ||
3339 | /* Copy relocated percpu area over. */ | |
3340 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3341 | info->sechdrs[info->index.pcpu].sh_size); | |
3342 | ||
51f3d0f4 | 3343 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3344 | add_kallsyms(mod, info); |
3345 | ||
3346 | /* Arch-specific module finalizing. */ | |
3347 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3348 | } | |
3349 | ||
9bb9c3be RR |
3350 | /* Is this module of this name done loading? No locks held. */ |
3351 | static bool finished_loading(const char *name) | |
3352 | { | |
3353 | struct module *mod; | |
3354 | bool ret; | |
3355 | ||
9cc019b8 PZ |
3356 | /* |
3357 | * The module_mutex should not be a heavily contended lock; | |
3358 | * if we get the occasional sleep here, we'll go an extra iteration | |
3359 | * in the wait_event_interruptible(), which is harmless. | |
3360 | */ | |
3361 | sched_annotate_sleep(); | |
9bb9c3be | 3362 | mutex_lock(&module_mutex); |
4f6de4d5 | 3363 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3364 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3365 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3366 | mutex_unlock(&module_mutex); |
3367 | ||
3368 | return ret; | |
3369 | } | |
3370 | ||
34e1169d KC |
3371 | /* Call module constructors. */ |
3372 | static void do_mod_ctors(struct module *mod) | |
3373 | { | |
3374 | #ifdef CONFIG_CONSTRUCTORS | |
3375 | unsigned long i; | |
3376 | ||
3377 | for (i = 0; i < mod->num_ctors; i++) | |
3378 | mod->ctors[i](); | |
3379 | #endif | |
3380 | } | |
3381 | ||
c7496379 RR |
3382 | /* For freeing module_init on success, in case kallsyms traversing */ |
3383 | struct mod_initfree { | |
3384 | struct rcu_head rcu; | |
3385 | void *module_init; | |
3386 | }; | |
3387 | ||
3388 | static void do_free_init(struct rcu_head *head) | |
3389 | { | |
3390 | struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); | |
3391 | module_memfree(m->module_init); | |
3392 | kfree(m); | |
3393 | } | |
3394 | ||
be02a186 JK |
3395 | /* |
3396 | * This is where the real work happens. | |
3397 | * | |
3398 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3399 | * helper command 'lx-symbols'. | |
3400 | */ | |
3401 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3402 | { |
3403 | int ret = 0; | |
c7496379 RR |
3404 | struct mod_initfree *freeinit; |
3405 | ||
3406 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3407 | if (!freeinit) { | |
3408 | ret = -ENOMEM; | |
3409 | goto fail; | |
3410 | } | |
7523e4dc | 3411 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3412 | |
774a1221 TH |
3413 | /* |
3414 | * We want to find out whether @mod uses async during init. Clear | |
3415 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3416 | */ | |
3417 | current->flags &= ~PF_USED_ASYNC; | |
3418 | ||
34e1169d KC |
3419 | do_mod_ctors(mod); |
3420 | /* Start the module */ | |
3421 | if (mod->init != NULL) | |
3422 | ret = do_one_initcall(mod->init); | |
3423 | if (ret < 0) { | |
c7496379 | 3424 | goto fail_free_freeinit; |
34e1169d KC |
3425 | } |
3426 | if (ret > 0) { | |
bddb12b3 AM |
3427 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3428 | "follow 0/-E convention\n" | |
3429 | "%s: loading module anyway...\n", | |
3430 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3431 | dump_stack(); |
3432 | } | |
3433 | ||
3434 | /* Now it's a first class citizen! */ | |
3435 | mod->state = MODULE_STATE_LIVE; | |
3436 | blocking_notifier_call_chain(&module_notify_list, | |
3437 | MODULE_STATE_LIVE, mod); | |
3438 | ||
774a1221 TH |
3439 | /* |
3440 | * We need to finish all async code before the module init sequence | |
3441 | * is done. This has potential to deadlock. For example, a newly | |
3442 | * detected block device can trigger request_module() of the | |
3443 | * default iosched from async probing task. Once userland helper | |
3444 | * reaches here, async_synchronize_full() will wait on the async | |
3445 | * task waiting on request_module() and deadlock. | |
3446 | * | |
3447 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3448 | * iff module init queued any async jobs. This isn't a full | |
3449 | * solution as it will deadlock the same if module loading from | |
3450 | * async jobs nests more than once; however, due to the various | |
3451 | * constraints, this hack seems to be the best option for now. | |
3452 | * Please refer to the following thread for details. | |
3453 | * | |
3454 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3455 | */ | |
f2411da7 | 3456 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3457 | async_synchronize_full(); |
34e1169d | 3458 | |
aba4b5c2 | 3459 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3460 | mod->init_layout.size); |
34e1169d KC |
3461 | mutex_lock(&module_mutex); |
3462 | /* Drop initial reference. */ | |
3463 | module_put(mod); | |
3464 | trim_init_extable(mod); | |
3465 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3466 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3467 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3468 | #endif |
444d13ff | 3469 | module_enable_ro(mod, true); |
93c2e105 | 3470 | mod_tree_remove_init(mod); |
85c898db | 3471 | disable_ro_nx(&mod->init_layout); |
d453cded | 3472 | module_arch_freeing_init(mod); |
7523e4dc RR |
3473 | mod->init_layout.base = NULL; |
3474 | mod->init_layout.size = 0; | |
3475 | mod->init_layout.ro_size = 0; | |
444d13ff | 3476 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3477 | mod->init_layout.text_size = 0; |
c7496379 RR |
3478 | /* |
3479 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be PZ |
3480 | * walking this with preempt disabled. In all the failure paths, we |
3481 | * call synchronize_sched(), but we don't want to slow down the success | |
3482 | * path, so use actual RCU here. | |
ae646f0b JH |
3483 | * Note that module_alloc() on most architectures creates W+X page |
3484 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3485 | * code such as mark_rodata_ro() which depends on those mappings to | |
3486 | * be cleaned up needs to sync with the queued work - ie | |
3487 | * rcu_barrier_sched() | |
c7496379 | 3488 | */ |
0be964be | 3489 | call_rcu_sched(&freeinit->rcu, do_free_init); |
34e1169d KC |
3490 | mutex_unlock(&module_mutex); |
3491 | wake_up_all(&module_wq); | |
3492 | ||
3493 | return 0; | |
c7496379 RR |
3494 | |
3495 | fail_free_freeinit: | |
3496 | kfree(freeinit); | |
3497 | fail: | |
3498 | /* Try to protect us from buggy refcounters. */ | |
3499 | mod->state = MODULE_STATE_GOING; | |
3500 | synchronize_sched(); | |
3501 | module_put(mod); | |
3502 | blocking_notifier_call_chain(&module_notify_list, | |
3503 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3504 | klp_module_going(mod); |
7dcd182b | 3505 | ftrace_release_mod(mod); |
c7496379 RR |
3506 | free_module(mod); |
3507 | wake_up_all(&module_wq); | |
3508 | return ret; | |
34e1169d KC |
3509 | } |
3510 | ||
3511 | static int may_init_module(void) | |
3512 | { | |
3513 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3514 | return -EPERM; | |
3515 | ||
3516 | return 0; | |
3517 | } | |
3518 | ||
a3535c7e RR |
3519 | /* |
3520 | * We try to place it in the list now to make sure it's unique before | |
3521 | * we dedicate too many resources. In particular, temporary percpu | |
3522 | * memory exhaustion. | |
3523 | */ | |
3524 | static int add_unformed_module(struct module *mod) | |
3525 | { | |
3526 | int err; | |
3527 | struct module *old; | |
3528 | ||
3529 | mod->state = MODULE_STATE_UNFORMED; | |
3530 | ||
3531 | again: | |
3532 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3533 | old = find_module_all(mod->name, strlen(mod->name), true); |
3534 | if (old != NULL) { | |
a3535c7e RR |
3535 | if (old->state == MODULE_STATE_COMING |
3536 | || old->state == MODULE_STATE_UNFORMED) { | |
3537 | /* Wait in case it fails to load. */ | |
3538 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3539 | err = wait_event_interruptible(module_wq, |
3540 | finished_loading(mod->name)); | |
a3535c7e RR |
3541 | if (err) |
3542 | goto out_unlocked; | |
3543 | goto again; | |
3544 | } | |
3545 | err = -EEXIST; | |
3546 | goto out; | |
3547 | } | |
4f666546 | 3548 | mod_update_bounds(mod); |
a3535c7e | 3549 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3550 | mod_tree_insert(mod); |
a3535c7e RR |
3551 | err = 0; |
3552 | ||
3553 | out: | |
3554 | mutex_unlock(&module_mutex); | |
3555 | out_unlocked: | |
3556 | return err; | |
3557 | } | |
3558 | ||
3559 | static int complete_formation(struct module *mod, struct load_info *info) | |
3560 | { | |
3561 | int err; | |
3562 | ||
3563 | mutex_lock(&module_mutex); | |
3564 | ||
3565 | /* Find duplicate symbols (must be called under lock). */ | |
3566 | err = verify_export_symbols(mod); | |
3567 | if (err < 0) | |
3568 | goto out; | |
3569 | ||
3570 | /* This relies on module_mutex for list integrity. */ | |
3571 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3572 | ||
444d13ff | 3573 | module_enable_ro(mod, false); |
85c898db | 3574 | module_enable_nx(mod); |
4982223e | 3575 | |
a3535c7e RR |
3576 | /* Mark state as coming so strong_try_module_get() ignores us, |
3577 | * but kallsyms etc. can see us. */ | |
3578 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3579 | mutex_unlock(&module_mutex); |
3580 | ||
4982223e | 3581 | return 0; |
a3535c7e RR |
3582 | |
3583 | out: | |
3584 | mutex_unlock(&module_mutex); | |
3585 | return err; | |
3586 | } | |
3587 | ||
4c973d16 JY |
3588 | static int prepare_coming_module(struct module *mod) |
3589 | { | |
7e545d6e JY |
3590 | int err; |
3591 | ||
4c973d16 | 3592 | ftrace_module_enable(mod); |
7e545d6e JY |
3593 | err = klp_module_coming(mod); |
3594 | if (err) | |
3595 | return err; | |
3596 | ||
4c973d16 JY |
3597 | blocking_notifier_call_chain(&module_notify_list, |
3598 | MODULE_STATE_COMING, mod); | |
3599 | return 0; | |
3600 | } | |
3601 | ||
ecc86170 LR |
3602 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3603 | void *arg) | |
54041d8a | 3604 | { |
f2411da7 LR |
3605 | struct module *mod = arg; |
3606 | int ret; | |
3607 | ||
3608 | if (strcmp(param, "async_probe") == 0) { | |
3609 | mod->async_probe_requested = true; | |
3610 | return 0; | |
3611 | } | |
3612 | ||
6da0b565 | 3613 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3614 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3615 | if (ret != 0) |
3616 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3617 | return 0; |
3618 | } | |
3619 | ||
d913188c RR |
3620 | /* Allocate and load the module: note that size of section 0 is always |
3621 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3622 | static int load_module(struct load_info *info, const char __user *uargs, |
3623 | int flags) | |
d913188c | 3624 | { |
a3535c7e | 3625 | struct module *mod; |
5fdc7db6 | 3626 | long err = 0; |
51e158c1 | 3627 | char *after_dashes; |
d913188c | 3628 | |
5fdc7db6 JY |
3629 | err = elf_header_check(info); |
3630 | if (err) | |
3631 | goto free_copy; | |
3632 | ||
3633 | err = setup_load_info(info, flags); | |
3634 | if (err) | |
3635 | goto free_copy; | |
3636 | ||
3637 | if (blacklisted(info->name)) { | |
3638 | err = -EPERM; | |
3639 | goto free_copy; | |
3640 | } | |
3641 | ||
bca014ca | 3642 | err = module_sig_check(info, flags); |
34e1169d KC |
3643 | if (err) |
3644 | goto free_copy; | |
d913188c | 3645 | |
5fdc7db6 | 3646 | err = rewrite_section_headers(info, flags); |
d913188c | 3647 | if (err) |
34e1169d | 3648 | goto free_copy; |
d913188c | 3649 | |
5fdc7db6 JY |
3650 | /* Check module struct version now, before we try to use module. */ |
3651 | if (!check_modstruct_version(info, info->mod)) { | |
3652 | err = -ENOEXEC; | |
3653 | goto free_copy; | |
3654 | } | |
3655 | ||
d913188c | 3656 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3657 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3658 | if (IS_ERR(mod)) { |
3659 | err = PTR_ERR(mod); | |
d913188c | 3660 | goto free_copy; |
1da177e4 | 3661 | } |
1da177e4 | 3662 | |
ca86cad7 RGB |
3663 | audit_log_kern_module(mod->name); |
3664 | ||
a3535c7e RR |
3665 | /* Reserve our place in the list. */ |
3666 | err = add_unformed_module(mod); | |
3667 | if (err) | |
1fb9341a | 3668 | goto free_module; |
1fb9341a | 3669 | |
106a4ee2 | 3670 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3671 | mod->sig_ok = info->sig_ok; |
64748a2c | 3672 | if (!mod->sig_ok) { |
bddb12b3 | 3673 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3674 | "and/or required key missing - tainting " |
bddb12b3 | 3675 | "kernel\n", mod->name); |
66cc69e3 | 3676 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3677 | } |
106a4ee2 RR |
3678 | #endif |
3679 | ||
8d8022e8 | 3680 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3681 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3682 | if (err) |
3683 | goto unlink_mod; | |
3684 | ||
49668688 | 3685 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3686 | err = module_unload_init(mod); |
3687 | if (err) | |
1fb9341a | 3688 | goto unlink_mod; |
1da177e4 | 3689 | |
cf2fde7b | 3690 | init_param_lock(mod); |
b51d23e4 | 3691 | |
22e268eb RR |
3692 | /* Now we've got everything in the final locations, we can |
3693 | * find optional sections. */ | |
eb3057df FH |
3694 | err = find_module_sections(mod, info); |
3695 | if (err) | |
3696 | goto free_unload; | |
9b37ccfc | 3697 | |
49668688 | 3698 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3699 | if (err) |
3700 | goto free_unload; | |
9841d61d | 3701 | |
c988d2b2 | 3702 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3703 | setup_modinfo(mod, info); |
c988d2b2 | 3704 | |
1da177e4 | 3705 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3706 | err = simplify_symbols(mod, info); |
1da177e4 | 3707 | if (err < 0) |
d913188c | 3708 | goto free_modinfo; |
1da177e4 | 3709 | |
34e1169d | 3710 | err = apply_relocations(mod, info); |
22e268eb | 3711 | if (err < 0) |
d913188c | 3712 | goto free_modinfo; |
1da177e4 | 3713 | |
34e1169d | 3714 | err = post_relocation(mod, info); |
1da177e4 | 3715 | if (err < 0) |
d913188c | 3716 | goto free_modinfo; |
1da177e4 | 3717 | |
22e268eb | 3718 | flush_module_icache(mod); |
378bac82 | 3719 | |
6526c534 RR |
3720 | /* Now copy in args */ |
3721 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3722 | if (IS_ERR(mod->args)) { | |
3723 | err = PTR_ERR(mod->args); | |
3724 | goto free_arch_cleanup; | |
3725 | } | |
8d3b33f6 | 3726 | |
52796312 | 3727 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3728 | |
a949ae56 SRRH |
3729 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3730 | ftrace_module_init(mod); | |
3731 | ||
a3535c7e RR |
3732 | /* Finally it's fully formed, ready to start executing. */ |
3733 | err = complete_formation(mod, info); | |
3734 | if (err) | |
1fb9341a | 3735 | goto ddebug_cleanup; |
be593f4c | 3736 | |
4c973d16 JY |
3737 | err = prepare_coming_module(mod); |
3738 | if (err) | |
3739 | goto bug_cleanup; | |
3740 | ||
51f3d0f4 | 3741 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3742 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3743 | -32768, 32767, mod, |
ecc86170 | 3744 | unknown_module_param_cb); |
51e158c1 RR |
3745 | if (IS_ERR(after_dashes)) { |
3746 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3747 | goto coming_cleanup; |
51e158c1 RR |
3748 | } else if (after_dashes) { |
3749 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3750 | mod->name, after_dashes); | |
3751 | } | |
1da177e4 | 3752 | |
ca86cad7 | 3753 | /* Link in to sysfs. */ |
34e1169d | 3754 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3755 | if (err < 0) |
4c973d16 | 3756 | goto coming_cleanup; |
80a3d1bb | 3757 | |
1ce15ef4 JY |
3758 | if (is_livepatch_module(mod)) { |
3759 | err = copy_module_elf(mod, info); | |
3760 | if (err < 0) | |
3761 | goto sysfs_cleanup; | |
3762 | } | |
3763 | ||
48fd1188 | 3764 | /* Get rid of temporary copy. */ |
34e1169d | 3765 | free_copy(info); |
1da177e4 LT |
3766 | |
3767 | /* Done! */ | |
51f3d0f4 | 3768 | trace_module_load(mod); |
34e1169d KC |
3769 | |
3770 | return do_init_module(mod); | |
1da177e4 | 3771 | |
1ce15ef4 JY |
3772 | sysfs_cleanup: |
3773 | mod_sysfs_teardown(mod); | |
4c973d16 | 3774 | coming_cleanup: |
885a78d4 | 3775 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3776 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3777 | blocking_notifier_call_chain(&module_notify_list, |
3778 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3779 | klp_module_going(mod); |
1fb9341a RR |
3780 | bug_cleanup: |
3781 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3782 | mutex_lock(&module_mutex); |
5336377d | 3783 | module_bug_cleanup(mod); |
ee61abb3 | 3784 | mutex_unlock(&module_mutex); |
ff7e0055 AL |
3785 | |
3786 | /* we can't deallocate the module until we clear memory protection */ | |
85c898db RR |
3787 | module_disable_ro(mod); |
3788 | module_disable_nx(mod); | |
ff7e0055 | 3789 | |
a3535c7e | 3790 | ddebug_cleanup: |
1323eac7 | 3791 | ftrace_release_mod(mod); |
52796312 | 3792 | dynamic_debug_remove(mod, info->debug); |
e91defa2 | 3793 | synchronize_sched(); |
6526c534 RR |
3794 | kfree(mod->args); |
3795 | free_arch_cleanup: | |
1da177e4 | 3796 | module_arch_cleanup(mod); |
d913188c | 3797 | free_modinfo: |
a263f776 | 3798 | free_modinfo(mod); |
22e268eb | 3799 | free_unload: |
1da177e4 | 3800 | module_unload_free(mod); |
1fb9341a RR |
3801 | unlink_mod: |
3802 | mutex_lock(&module_mutex); | |
3803 | /* Unlink carefully: kallsyms could be walking list. */ | |
3804 | list_del_rcu(&mod->list); | |
758556bd | 3805 | mod_tree_remove(mod); |
1fb9341a | 3806 | wake_up_all(&module_wq); |
0be964be PZ |
3807 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
3808 | synchronize_sched(); | |
1fb9341a | 3809 | mutex_unlock(&module_mutex); |
d913188c | 3810 | free_module: |
35a9393c | 3811 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3812 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3813 | |
34e1169d | 3814 | module_deallocate(mod, info); |
d913188c | 3815 | free_copy: |
34e1169d KC |
3816 | free_copy(info); |
3817 | return err; | |
b99b87f7 PO |
3818 | } |
3819 | ||
17da2bd9 HC |
3820 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3821 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3822 | { |
34e1169d KC |
3823 | int err; |
3824 | struct load_info info = { }; | |
1da177e4 | 3825 | |
34e1169d KC |
3826 | err = may_init_module(); |
3827 | if (err) | |
3828 | return err; | |
1da177e4 | 3829 | |
34e1169d KC |
3830 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3831 | umod, len, uargs); | |
1da177e4 | 3832 | |
34e1169d KC |
3833 | err = copy_module_from_user(umod, len, &info); |
3834 | if (err) | |
3835 | return err; | |
1da177e4 | 3836 | |
2f3238ae | 3837 | return load_module(&info, uargs, 0); |
34e1169d | 3838 | } |
94462ad3 | 3839 | |
2f3238ae | 3840 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3841 | { |
34e1169d | 3842 | struct load_info info = { }; |
a1db7420 MZ |
3843 | loff_t size; |
3844 | void *hdr; | |
3845 | int err; | |
94462ad3 | 3846 | |
34e1169d KC |
3847 | err = may_init_module(); |
3848 | if (err) | |
3849 | return err; | |
1da177e4 | 3850 | |
2f3238ae | 3851 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3852 | |
2f3238ae RR |
3853 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3854 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3855 | return -EINVAL; | |
d6de2c80 | 3856 | |
a1db7420 MZ |
3857 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
3858 | READING_MODULE); | |
34e1169d KC |
3859 | if (err) |
3860 | return err; | |
a1db7420 MZ |
3861 | info.hdr = hdr; |
3862 | info.len = size; | |
1da177e4 | 3863 | |
2f3238ae | 3864 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3865 | } |
3866 | ||
3867 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3868 | { | |
3869 | return ((void *)addr >= start && (void *)addr < start + size); | |
3870 | } | |
3871 | ||
3872 | #ifdef CONFIG_KALLSYMS | |
3873 | /* | |
3874 | * This ignores the intensely annoying "mapping symbols" found | |
3875 | * in ARM ELF files: $a, $t and $d. | |
3876 | */ | |
3877 | static inline int is_arm_mapping_symbol(const char *str) | |
3878 | { | |
2e3a10a1 RK |
3879 | if (str[0] == '.' && str[1] == 'L') |
3880 | return true; | |
6c34f1f5 | 3881 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3882 | && (str[2] == '\0' || str[2] == '.'); |
3883 | } | |
3884 | ||
8244062e | 3885 | static const char *symname(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 3886 | { |
8244062e | 3887 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
3888 | } |
3889 | ||
1da177e4 LT |
3890 | static const char *get_ksymbol(struct module *mod, |
3891 | unsigned long addr, | |
3892 | unsigned long *size, | |
3893 | unsigned long *offset) | |
3894 | { | |
3895 | unsigned int i, best = 0; | |
3896 | unsigned long nextval; | |
8244062e | 3897 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
3898 | |
3899 | /* At worse, next value is at end of module */ | |
a06f6211 | 3900 | if (within_module_init(addr, mod)) |
7523e4dc | 3901 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 3902 | else |
7523e4dc | 3903 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 3904 | |
25985edc | 3905 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3906 | starts real symbols at 1). */ |
8244062e RR |
3907 | for (i = 1; i < kallsyms->num_symtab; i++) { |
3908 | if (kallsyms->symtab[i].st_shndx == SHN_UNDEF) | |
1da177e4 LT |
3909 | continue; |
3910 | ||
3911 | /* We ignore unnamed symbols: they're uninformative | |
3912 | * and inserted at a whim. */ | |
8244062e RR |
3913 | if (*symname(kallsyms, i) == '\0' |
3914 | || is_arm_mapping_symbol(symname(kallsyms, i))) | |
2e7bac53 RR |
3915 | continue; |
3916 | ||
8244062e RR |
3917 | if (kallsyms->symtab[i].st_value <= addr |
3918 | && kallsyms->symtab[i].st_value > kallsyms->symtab[best].st_value) | |
1da177e4 | 3919 | best = i; |
8244062e RR |
3920 | if (kallsyms->symtab[i].st_value > addr |
3921 | && kallsyms->symtab[i].st_value < nextval) | |
3922 | nextval = kallsyms->symtab[i].st_value; | |
1da177e4 LT |
3923 | } |
3924 | ||
3925 | if (!best) | |
3926 | return NULL; | |
3927 | ||
ffb45122 | 3928 | if (size) |
8244062e | 3929 | *size = nextval - kallsyms->symtab[best].st_value; |
ffb45122 | 3930 | if (offset) |
8244062e RR |
3931 | *offset = addr - kallsyms->symtab[best].st_value; |
3932 | return symname(kallsyms, best); | |
1da177e4 LT |
3933 | } |
3934 | ||
b865ea64 SS |
3935 | void * __weak dereference_module_function_descriptor(struct module *mod, |
3936 | void *ptr) | |
3937 | { | |
3938 | return ptr; | |
3939 | } | |
3940 | ||
6dd06c9f RR |
3941 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3942 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3943 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3944 | unsigned long *size, |
3945 | unsigned long *offset, | |
3946 | char **modname, | |
3947 | char *namebuf) | |
1da177e4 | 3948 | { |
cb2a5205 | 3949 | const char *ret = NULL; |
b7df4d1b | 3950 | struct module *mod; |
1da177e4 | 3951 | |
cb2a5205 | 3952 | preempt_disable(); |
b7df4d1b PZ |
3953 | mod = __module_address(addr); |
3954 | if (mod) { | |
3955 | if (modname) | |
3956 | *modname = mod->name; | |
3957 | ret = get_ksymbol(mod, addr, size, offset); | |
1da177e4 | 3958 | } |
6dd06c9f RR |
3959 | /* Make a copy in here where it's safe */ |
3960 | if (ret) { | |
3961 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3962 | ret = namebuf; | |
3963 | } | |
cb2a5205 | 3964 | preempt_enable(); |
b7df4d1b | 3965 | |
92dfc9dc | 3966 | return ret; |
1da177e4 LT |
3967 | } |
3968 | ||
9d65cb4a AD |
3969 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3970 | { | |
3971 | struct module *mod; | |
3972 | ||
cb2a5205 | 3973 | preempt_disable(); |
d72b3751 | 3974 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3975 | if (mod->state == MODULE_STATE_UNFORMED) |
3976 | continue; | |
9b20a352 | 3977 | if (within_module(addr, mod)) { |
9d65cb4a AD |
3978 | const char *sym; |
3979 | ||
3980 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3981 | if (!sym) | |
3982 | goto out; | |
9281acea | 3983 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3984 | preempt_enable(); |
9d65cb4a AD |
3985 | return 0; |
3986 | } | |
3987 | } | |
3988 | out: | |
cb2a5205 | 3989 | preempt_enable(); |
9d65cb4a AD |
3990 | return -ERANGE; |
3991 | } | |
3992 | ||
a5c43dae AD |
3993 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3994 | unsigned long *offset, char *modname, char *name) | |
3995 | { | |
3996 | struct module *mod; | |
3997 | ||
cb2a5205 | 3998 | preempt_disable(); |
d72b3751 | 3999 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4000 | if (mod->state == MODULE_STATE_UNFORMED) |
4001 | continue; | |
9b20a352 | 4002 | if (within_module(addr, mod)) { |
a5c43dae AD |
4003 | const char *sym; |
4004 | ||
4005 | sym = get_ksymbol(mod, addr, size, offset); | |
4006 | if (!sym) | |
4007 | goto out; | |
4008 | if (modname) | |
9281acea | 4009 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4010 | if (name) |
9281acea | 4011 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4012 | preempt_enable(); |
a5c43dae AD |
4013 | return 0; |
4014 | } | |
4015 | } | |
4016 | out: | |
cb2a5205 | 4017 | preempt_enable(); |
a5c43dae AD |
4018 | return -ERANGE; |
4019 | } | |
4020 | ||
ea07890a AD |
4021 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4022 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4023 | { |
4024 | struct module *mod; | |
4025 | ||
cb2a5205 | 4026 | preempt_disable(); |
d72b3751 | 4027 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4028 | struct mod_kallsyms *kallsyms; |
4029 | ||
0d21b0e3 RR |
4030 | if (mod->state == MODULE_STATE_UNFORMED) |
4031 | continue; | |
8244062e RR |
4032 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4033 | if (symnum < kallsyms->num_symtab) { | |
4034 | *value = kallsyms->symtab[symnum].st_value; | |
4035 | *type = kallsyms->symtab[symnum].st_info; | |
4036 | strlcpy(name, symname(kallsyms, symnum), KSYM_NAME_LEN); | |
9281acea | 4037 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4038 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4039 | preempt_enable(); |
ea07890a | 4040 | return 0; |
1da177e4 | 4041 | } |
8244062e | 4042 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4043 | } |
cb2a5205 | 4044 | preempt_enable(); |
ea07890a | 4045 | return -ERANGE; |
1da177e4 LT |
4046 | } |
4047 | ||
4048 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
4049 | { | |
4050 | unsigned int i; | |
8244062e | 4051 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4052 | |
8244062e RR |
4053 | for (i = 0; i < kallsyms->num_symtab; i++) |
4054 | if (strcmp(name, symname(kallsyms, i)) == 0 && | |
9f2d1e68 | 4055 | kallsyms->symtab[i].st_shndx != SHN_UNDEF) |
8244062e | 4056 | return kallsyms->symtab[i].st_value; |
1da177e4 LT |
4057 | return 0; |
4058 | } | |
4059 | ||
4060 | /* Look for this name: can be of form module:name. */ | |
4061 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4062 | { | |
4063 | struct module *mod; | |
4064 | char *colon; | |
4065 | unsigned long ret = 0; | |
4066 | ||
4067 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4068 | preempt_disable(); |
17586188 | 4069 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4070 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 4071 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 4072 | } else { |
0d21b0e3 RR |
4073 | list_for_each_entry_rcu(mod, &modules, list) { |
4074 | if (mod->state == MODULE_STATE_UNFORMED) | |
4075 | continue; | |
1da177e4 LT |
4076 | if ((ret = mod_find_symname(mod, name)) != 0) |
4077 | break; | |
0d21b0e3 | 4078 | } |
1da177e4 | 4079 | } |
cb2a5205 | 4080 | preempt_enable(); |
1da177e4 LT |
4081 | return ret; |
4082 | } | |
75a66614 AK |
4083 | |
4084 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4085 | struct module *, unsigned long), | |
4086 | void *data) | |
4087 | { | |
4088 | struct module *mod; | |
4089 | unsigned int i; | |
4090 | int ret; | |
4091 | ||
0be964be PZ |
4092 | module_assert_mutex(); |
4093 | ||
75a66614 | 4094 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4095 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4096 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4097 | ||
0d21b0e3 RR |
4098 | if (mod->state == MODULE_STATE_UNFORMED) |
4099 | continue; | |
8244062e | 4100 | for (i = 0; i < kallsyms->num_symtab; i++) { |
9f2d1e68 JY |
4101 | |
4102 | if (kallsyms->symtab[i].st_shndx == SHN_UNDEF) | |
4103 | continue; | |
4104 | ||
8244062e RR |
4105 | ret = fn(data, symname(kallsyms, i), |
4106 | mod, kallsyms->symtab[i].st_value); | |
75a66614 AK |
4107 | if (ret != 0) |
4108 | return ret; | |
4109 | } | |
4110 | } | |
4111 | return 0; | |
4112 | } | |
1da177e4 LT |
4113 | #endif /* CONFIG_KALLSYMS */ |
4114 | ||
7fd8329b PM |
4115 | /* Maximum number of characters written by module_flags() */ |
4116 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4117 | ||
4118 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4119 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4120 | { |
4121 | int bx = 0; | |
4122 | ||
0d21b0e3 | 4123 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4124 | if (mod->taints || |
4125 | mod->state == MODULE_STATE_GOING || | |
4126 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4127 | buf[bx++] = '('; |
cca3e707 | 4128 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4129 | /* Show a - for module-is-being-unloaded */ |
4130 | if (mod->state == MODULE_STATE_GOING) | |
4131 | buf[bx++] = '-'; | |
4132 | /* Show a + for module-is-being-loaded */ | |
4133 | if (mod->state == MODULE_STATE_COMING) | |
4134 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4135 | buf[bx++] = ')'; |
4136 | } | |
4137 | buf[bx] = '\0'; | |
4138 | ||
4139 | return buf; | |
4140 | } | |
4141 | ||
3b5d5c6b AD |
4142 | #ifdef CONFIG_PROC_FS |
4143 | /* Called by the /proc file system to return a list of modules. */ | |
4144 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4145 | { | |
4146 | mutex_lock(&module_mutex); | |
4147 | return seq_list_start(&modules, *pos); | |
4148 | } | |
4149 | ||
4150 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4151 | { | |
4152 | return seq_list_next(p, &modules, pos); | |
4153 | } | |
4154 | ||
4155 | static void m_stop(struct seq_file *m, void *p) | |
4156 | { | |
4157 | mutex_unlock(&module_mutex); | |
4158 | } | |
4159 | ||
1da177e4 LT |
4160 | static int m_show(struct seq_file *m, void *p) |
4161 | { | |
4162 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4163 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4164 | void *value; |
fa3ba2e8 | 4165 | |
0d21b0e3 RR |
4166 | /* We always ignore unformed modules. */ |
4167 | if (mod->state == MODULE_STATE_UNFORMED) | |
4168 | return 0; | |
4169 | ||
2f0f2a33 | 4170 | seq_printf(m, "%s %u", |
7523e4dc | 4171 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4172 | print_unload_info(m, mod); |
4173 | ||
4174 | /* Informative for users. */ | |
4175 | seq_printf(m, " %s", | |
6da0b565 IA |
4176 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4177 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4178 | "Live"); |
4179 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4180 | value = m->private ? NULL : mod->core_layout.base; |
4181 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4182 | |
fa3ba2e8 FM |
4183 | /* Taints info */ |
4184 | if (mod->taints) | |
21aa9280 | 4185 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4186 | |
6da0b565 | 4187 | seq_puts(m, "\n"); |
1da177e4 LT |
4188 | return 0; |
4189 | } | |
4190 | ||
4191 | /* Format: modulename size refcount deps address | |
4192 | ||
4193 | Where refcount is a number or -, and deps is a comma-separated list | |
4194 | of depends or -. | |
4195 | */ | |
3b5d5c6b | 4196 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4197 | .start = m_start, |
4198 | .next = m_next, | |
4199 | .stop = m_stop, | |
4200 | .show = m_show | |
4201 | }; | |
4202 | ||
516fb7f2 LT |
4203 | /* |
4204 | * This also sets the "private" pointer to non-NULL if the | |
4205 | * kernel pointers should be hidden (so you can just test | |
4206 | * "m->private" to see if you should keep the values private). | |
4207 | * | |
4208 | * We use the same logic as for /proc/kallsyms. | |
4209 | */ | |
3b5d5c6b AD |
4210 | static int modules_open(struct inode *inode, struct file *file) |
4211 | { | |
516fb7f2 LT |
4212 | int err = seq_open(file, &modules_op); |
4213 | ||
4214 | if (!err) { | |
4215 | struct seq_file *m = file->private_data; | |
4216 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4217 | } | |
4218 | ||
3f553b30 | 4219 | return err; |
3b5d5c6b AD |
4220 | } |
4221 | ||
4222 | static const struct file_operations proc_modules_operations = { | |
4223 | .open = modules_open, | |
4224 | .read = seq_read, | |
4225 | .llseek = seq_lseek, | |
4226 | .release = seq_release, | |
4227 | }; | |
4228 | ||
4229 | static int __init proc_modules_init(void) | |
4230 | { | |
4231 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4232 | return 0; | |
4233 | } | |
4234 | module_init(proc_modules_init); | |
4235 | #endif | |
4236 | ||
1da177e4 LT |
4237 | /* Given an address, look for it in the module exception tables. */ |
4238 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4239 | { | |
1da177e4 LT |
4240 | const struct exception_table_entry *e = NULL; |
4241 | struct module *mod; | |
4242 | ||
24da1cbf | 4243 | preempt_disable(); |
5ff22646 PZ |
4244 | mod = __module_address(addr); |
4245 | if (!mod) | |
4246 | goto out; | |
22a8bdeb | 4247 | |
5ff22646 PZ |
4248 | if (!mod->num_exentries) |
4249 | goto out; | |
4250 | ||
4251 | e = search_extable(mod->extable, | |
a94c33dd | 4252 | mod->num_exentries, |
5ff22646 PZ |
4253 | addr); |
4254 | out: | |
24da1cbf | 4255 | preempt_enable(); |
1da177e4 | 4256 | |
5ff22646 PZ |
4257 | /* |
4258 | * Now, if we found one, we are running inside it now, hence | |
4259 | * we cannot unload the module, hence no refcnt needed. | |
4260 | */ | |
1da177e4 LT |
4261 | return e; |
4262 | } | |
4263 | ||
4d435f9d | 4264 | /* |
e610499e RR |
4265 | * is_module_address - is this address inside a module? |
4266 | * @addr: the address to check. | |
4267 | * | |
4268 | * See is_module_text_address() if you simply want to see if the address | |
4269 | * is code (not data). | |
4d435f9d | 4270 | */ |
e610499e | 4271 | bool is_module_address(unsigned long addr) |
4d435f9d | 4272 | { |
e610499e | 4273 | bool ret; |
4d435f9d | 4274 | |
24da1cbf | 4275 | preempt_disable(); |
e610499e | 4276 | ret = __module_address(addr) != NULL; |
24da1cbf | 4277 | preempt_enable(); |
4d435f9d | 4278 | |
e610499e | 4279 | return ret; |
4d435f9d IM |
4280 | } |
4281 | ||
e610499e RR |
4282 | /* |
4283 | * __module_address - get the module which contains an address. | |
4284 | * @addr: the address. | |
4285 | * | |
4286 | * Must be called with preempt disabled or module mutex held so that | |
4287 | * module doesn't get freed during this. | |
4288 | */ | |
714f83d5 | 4289 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4290 | { |
4291 | struct module *mod; | |
4292 | ||
3a642e99 RR |
4293 | if (addr < module_addr_min || addr > module_addr_max) |
4294 | return NULL; | |
4295 | ||
0be964be PZ |
4296 | module_assert_mutex_or_preempt(); |
4297 | ||
6c9692e2 | 4298 | mod = mod_find(addr); |
93c2e105 PZ |
4299 | if (mod) { |
4300 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4301 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4302 | mod = NULL; |
0d21b0e3 | 4303 | } |
93c2e105 | 4304 | return mod; |
1da177e4 | 4305 | } |
c6b37801 | 4306 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4307 | |
e610499e RR |
4308 | /* |
4309 | * is_module_text_address - is this address inside module code? | |
4310 | * @addr: the address to check. | |
4311 | * | |
4312 | * See is_module_address() if you simply want to see if the address is | |
4313 | * anywhere in a module. See kernel_text_address() for testing if an | |
4314 | * address corresponds to kernel or module code. | |
4315 | */ | |
4316 | bool is_module_text_address(unsigned long addr) | |
4317 | { | |
4318 | bool ret; | |
4319 | ||
4320 | preempt_disable(); | |
4321 | ret = __module_text_address(addr) != NULL; | |
4322 | preempt_enable(); | |
4323 | ||
4324 | return ret; | |
4325 | } | |
4326 | ||
4327 | /* | |
4328 | * __module_text_address - get the module whose code contains an address. | |
4329 | * @addr: the address. | |
4330 | * | |
4331 | * Must be called with preempt disabled or module mutex held so that | |
4332 | * module doesn't get freed during this. | |
4333 | */ | |
4334 | struct module *__module_text_address(unsigned long addr) | |
4335 | { | |
4336 | struct module *mod = __module_address(addr); | |
4337 | if (mod) { | |
4338 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4339 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4340 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4341 | mod = NULL; |
4342 | } | |
4343 | return mod; | |
4344 | } | |
c6b37801 | 4345 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4346 | |
1da177e4 LT |
4347 | /* Don't grab lock, we're oopsing. */ |
4348 | void print_modules(void) | |
4349 | { | |
4350 | struct module *mod; | |
7fd8329b | 4351 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4352 | |
b231125a | 4353 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4354 | /* Most callers should already have preempt disabled, but make sure */ |
4355 | preempt_disable(); | |
0d21b0e3 RR |
4356 | list_for_each_entry_rcu(mod, &modules, list) { |
4357 | if (mod->state == MODULE_STATE_UNFORMED) | |
4358 | continue; | |
27bba4d6 | 4359 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4360 | } |
d72b3751 | 4361 | preempt_enable(); |
e14af7ee | 4362 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4363 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4364 | pr_cont("\n"); | |
1da177e4 LT |
4365 | } |
4366 | ||
1da177e4 | 4367 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4368 | /* Generate the signature for all relevant module structures here. |
4369 | * If these change, we don't want to try to parse the module. */ | |
4370 | void module_layout(struct module *mod, | |
4371 | struct modversion_info *ver, | |
4372 | struct kernel_param *kp, | |
4373 | struct kernel_symbol *ks, | |
65498646 | 4374 | struct tracepoint * const *tp) |
8c8ef42a RR |
4375 | { |
4376 | } | |
4377 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4378 | #endif |