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Commit | Line | Data |
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f71d20e9 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 LT |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
9984de1a | 19 | #include <linux/export.h> |
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 MC |
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 MC |
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 | |
1a7b7d92 RE |
101 | /* Work queue for freeing init sections in success case */ |
102 | static struct work_struct init_free_wq; | |
103 | static struct llist_head init_free_list; | |
104 | ||
6c9692e2 | 105 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 106 | |
93c2e105 PZ |
107 | /* |
108 | * Use a latched RB-tree for __module_address(); this allows us to use | |
109 | * RCU-sched lookups of the address from any context. | |
110 | * | |
6c9692e2 PZ |
111 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
112 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
113 | * NMI context. | |
93c2e105 PZ |
114 | */ |
115 | ||
116 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 117 | { |
7523e4dc | 118 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 119 | |
7523e4dc | 120 | return (unsigned long)layout->base; |
93c2e105 PZ |
121 | } |
122 | ||
123 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
124 | { | |
7523e4dc | 125 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 126 | |
7523e4dc | 127 | return (unsigned long)layout->size; |
93c2e105 PZ |
128 | } |
129 | ||
130 | static __always_inline bool | |
131 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
132 | { | |
133 | return __mod_tree_val(a) < __mod_tree_val(b); | |
134 | } | |
135 | ||
136 | static __always_inline int | |
137 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
138 | { | |
139 | unsigned long val = (unsigned long)key; | |
140 | unsigned long start, end; | |
141 | ||
142 | start = __mod_tree_val(n); | |
143 | if (val < start) | |
144 | return -1; | |
145 | ||
146 | end = start + __mod_tree_size(n); | |
147 | if (val >= end) | |
148 | return 1; | |
106a4ee2 | 149 | |
106a4ee2 RR |
150 | return 0; |
151 | } | |
152 | ||
93c2e105 PZ |
153 | static const struct latch_tree_ops mod_tree_ops = { |
154 | .less = mod_tree_less, | |
155 | .comp = mod_tree_comp, | |
156 | }; | |
157 | ||
4f666546 PZ |
158 | static struct mod_tree_root { |
159 | struct latch_tree_root root; | |
160 | unsigned long addr_min; | |
161 | unsigned long addr_max; | |
162 | } mod_tree __cacheline_aligned = { | |
163 | .addr_min = -1UL, | |
106a4ee2 | 164 | }; |
106a4ee2 | 165 | |
4f666546 PZ |
166 | #define module_addr_min mod_tree.addr_min |
167 | #define module_addr_max mod_tree.addr_max | |
168 | ||
169 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
170 | { | |
171 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
172 | } | |
173 | ||
174 | static void __mod_tree_remove(struct mod_tree_node *node) | |
175 | { | |
176 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
177 | } | |
93c2e105 PZ |
178 | |
179 | /* | |
180 | * These modifications: insert, remove_init and remove; are serialized by the | |
181 | * module_mutex. | |
182 | */ | |
183 | static void mod_tree_insert(struct module *mod) | |
184 | { | |
7523e4dc RR |
185 | mod->core_layout.mtn.mod = mod; |
186 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 187 | |
7523e4dc RR |
188 | __mod_tree_insert(&mod->core_layout.mtn); |
189 | if (mod->init_layout.size) | |
190 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
191 | } |
192 | ||
193 | static void mod_tree_remove_init(struct module *mod) | |
194 | { | |
7523e4dc RR |
195 | if (mod->init_layout.size) |
196 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
197 | } |
198 | ||
199 | static void mod_tree_remove(struct module *mod) | |
200 | { | |
7523e4dc | 201 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
202 | mod_tree_remove_init(mod); |
203 | } | |
204 | ||
6c9692e2 | 205 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
206 | { |
207 | struct latch_tree_node *ltn; | |
208 | ||
4f666546 | 209 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
210 | if (!ltn) |
211 | return NULL; | |
212 | ||
213 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
214 | } | |
215 | ||
6c9692e2 PZ |
216 | #else /* MODULES_TREE_LOOKUP */ |
217 | ||
4f666546 PZ |
218 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
219 | ||
6c9692e2 PZ |
220 | static void mod_tree_insert(struct module *mod) { } |
221 | static void mod_tree_remove_init(struct module *mod) { } | |
222 | static void mod_tree_remove(struct module *mod) { } | |
223 | ||
224 | static struct module *mod_find(unsigned long addr) | |
225 | { | |
226 | struct module *mod; | |
227 | ||
228 | list_for_each_entry_rcu(mod, &modules, list) { | |
229 | if (within_module(addr, mod)) | |
230 | return mod; | |
231 | } | |
232 | ||
233 | return NULL; | |
234 | } | |
235 | ||
236 | #endif /* MODULES_TREE_LOOKUP */ | |
237 | ||
4f666546 PZ |
238 | /* |
239 | * Bounds of module text, for speeding up __module_address. | |
240 | * Protected by module_mutex. | |
241 | */ | |
242 | static void __mod_update_bounds(void *base, unsigned int size) | |
243 | { | |
244 | unsigned long min = (unsigned long)base; | |
245 | unsigned long max = min + size; | |
246 | ||
247 | if (min < module_addr_min) | |
248 | module_addr_min = min; | |
249 | if (max > module_addr_max) | |
250 | module_addr_max = max; | |
251 | } | |
252 | ||
253 | static void mod_update_bounds(struct module *mod) | |
254 | { | |
7523e4dc RR |
255 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
256 | if (mod->init_layout.size) | |
257 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
258 | } |
259 | ||
67fc4e0c JW |
260 | #ifdef CONFIG_KGDB_KDB |
261 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
262 | #endif /* CONFIG_KGDB_KDB */ | |
263 | ||
0be964be PZ |
264 | static void module_assert_mutex(void) |
265 | { | |
266 | lockdep_assert_held(&module_mutex); | |
267 | } | |
268 | ||
269 | static void module_assert_mutex_or_preempt(void) | |
270 | { | |
271 | #ifdef CONFIG_LOCKDEP | |
272 | if (unlikely(!debug_locks)) | |
273 | return; | |
274 | ||
9502514f | 275 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
276 | !lockdep_is_held(&module_mutex)); |
277 | #endif | |
278 | } | |
279 | ||
6727bb9c | 280 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 281 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 282 | |
fda784e5 BM |
283 | /* |
284 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
285 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
286 | */ | |
287 | bool is_module_sig_enforced(void) | |
288 | { | |
289 | return sig_enforce; | |
290 | } | |
291 | EXPORT_SYMBOL(is_module_sig_enforced); | |
292 | ||
8db5da0b MZ |
293 | void set_module_sig_enforced(void) |
294 | { | |
295 | sig_enforce = true; | |
296 | } | |
297 | ||
19e4529e SR |
298 | /* Block module loading/unloading? */ |
299 | int modules_disabled = 0; | |
02608bef | 300 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 301 | |
c9a3ba55 RR |
302 | /* Waiting for a module to finish initializing? */ |
303 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
304 | ||
e041c683 | 305 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 306 | |
6da0b565 | 307 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 308 | { |
e041c683 | 309 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
310 | } |
311 | EXPORT_SYMBOL(register_module_notifier); | |
312 | ||
6da0b565 | 313 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 314 | { |
e041c683 | 315 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
316 | } |
317 | EXPORT_SYMBOL(unregister_module_notifier); | |
318 | ||
71d9f507 MB |
319 | /* |
320 | * We require a truly strong try_module_get(): 0 means success. | |
321 | * Otherwise an error is returned due to ongoing or failed | |
322 | * initialization etc. | |
323 | */ | |
1da177e4 LT |
324 | static inline int strong_try_module_get(struct module *mod) |
325 | { | |
0d21b0e3 | 326 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 327 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
328 | return -EBUSY; |
329 | if (try_module_get(mod)) | |
1da177e4 | 330 | return 0; |
c9a3ba55 RR |
331 | else |
332 | return -ENOENT; | |
1da177e4 LT |
333 | } |
334 | ||
373d4d09 RR |
335 | static inline void add_taint_module(struct module *mod, unsigned flag, |
336 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 337 | { |
373d4d09 | 338 | add_taint(flag, lockdep_ok); |
7fd8329b | 339 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
340 | } |
341 | ||
02a3e59a RD |
342 | /* |
343 | * A thread that wants to hold a reference to a module only while it | |
344 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 345 | */ |
bf262dce | 346 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
347 | { |
348 | module_put(mod); | |
349 | do_exit(code); | |
350 | } | |
351 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 352 | |
1da177e4 | 353 | /* Find a module section: 0 means not found. */ |
49668688 | 354 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
355 | { |
356 | unsigned int i; | |
357 | ||
49668688 RR |
358 | for (i = 1; i < info->hdr->e_shnum; i++) { |
359 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 360 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
361 | if ((shdr->sh_flags & SHF_ALLOC) |
362 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 363 | return i; |
49668688 | 364 | } |
1da177e4 LT |
365 | return 0; |
366 | } | |
367 | ||
5e458cc0 | 368 | /* Find a module section, or NULL. */ |
49668688 | 369 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
370 | { |
371 | /* Section 0 has sh_addr 0. */ | |
49668688 | 372 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
373 | } |
374 | ||
375 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 376 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
377 | const char *name, |
378 | size_t object_size, | |
379 | unsigned int *num) | |
380 | { | |
49668688 | 381 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
382 | |
383 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
384 | *num = info->sechdrs[sec].sh_size / object_size; |
385 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
386 | } |
387 | ||
1da177e4 LT |
388 | /* Provided by the linker */ |
389 | extern const struct kernel_symbol __start___ksymtab[]; | |
390 | extern const struct kernel_symbol __stop___ksymtab[]; | |
391 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
392 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
393 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
394 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
395 | extern const s32 __start___kcrctab[]; |
396 | extern const s32 __start___kcrctab_gpl[]; | |
397 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
398 | #ifdef CONFIG_UNUSED_SYMBOLS |
399 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
400 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
401 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
402 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
403 | extern const s32 __start___kcrctab_unused[]; |
404 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 405 | #endif |
1da177e4 LT |
406 | |
407 | #ifndef CONFIG_MODVERSIONS | |
408 | #define symversion(base, idx) NULL | |
409 | #else | |
f83ca9fe | 410 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
411 | #endif |
412 | ||
dafd0940 RR |
413 | static bool each_symbol_in_section(const struct symsearch *arr, |
414 | unsigned int arrsize, | |
415 | struct module *owner, | |
416 | bool (*fn)(const struct symsearch *syms, | |
417 | struct module *owner, | |
de4d8d53 | 418 | void *data), |
dafd0940 | 419 | void *data) |
ad9546c9 | 420 | { |
de4d8d53 | 421 | unsigned int j; |
ad9546c9 | 422 | |
dafd0940 | 423 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
424 | if (fn(&arr[j], owner, data)) |
425 | return true; | |
f71d20e9 | 426 | } |
dafd0940 RR |
427 | |
428 | return false; | |
ad9546c9 RR |
429 | } |
430 | ||
dafd0940 | 431 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
432 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
433 | struct module *owner, | |
434 | void *data), | |
435 | void *data) | |
ad9546c9 RR |
436 | { |
437 | struct module *mod; | |
44032e63 | 438 | static const struct symsearch arr[] = { |
ad9546c9 | 439 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 440 | NOT_GPL_ONLY, false }, |
ad9546c9 | 441 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
442 | __start___kcrctab_gpl, |
443 | GPL_ONLY, false }, | |
ad9546c9 | 444 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
445 | __start___kcrctab_gpl_future, |
446 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 447 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 448 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
449 | __start___kcrctab_unused, |
450 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 451 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
452 | __start___kcrctab_unused_gpl, |
453 | GPL_ONLY, true }, | |
f7f5b675 | 454 | #endif |
ad9546c9 | 455 | }; |
f71d20e9 | 456 | |
0be964be PZ |
457 | module_assert_mutex_or_preempt(); |
458 | ||
dafd0940 RR |
459 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
460 | return true; | |
f71d20e9 | 461 | |
d72b3751 | 462 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
463 | struct symsearch arr[] = { |
464 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 465 | NOT_GPL_ONLY, false }, |
ad9546c9 | 466 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
467 | mod->gpl_crcs, |
468 | GPL_ONLY, false }, | |
ad9546c9 RR |
469 | { mod->gpl_future_syms, |
470 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
471 | mod->gpl_future_crcs, |
472 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 473 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
474 | { mod->unused_syms, |
475 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
476 | mod->unused_crcs, |
477 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
478 | { mod->unused_gpl_syms, |
479 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
480 | mod->unused_gpl_crcs, |
481 | GPL_ONLY, true }, | |
f7f5b675 | 482 | #endif |
ad9546c9 RR |
483 | }; |
484 | ||
0d21b0e3 RR |
485 | if (mod->state == MODULE_STATE_UNFORMED) |
486 | continue; | |
487 | ||
dafd0940 RR |
488 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
489 | return true; | |
490 | } | |
491 | return false; | |
492 | } | |
de4d8d53 | 493 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
494 | |
495 | struct find_symbol_arg { | |
496 | /* Input */ | |
497 | const char *name; | |
498 | bool gplok; | |
499 | bool warn; | |
500 | ||
501 | /* Output */ | |
502 | struct module *owner; | |
71810db2 | 503 | const s32 *crc; |
414fd31b | 504 | const struct kernel_symbol *sym; |
dafd0940 RR |
505 | }; |
506 | ||
2d25bc55 JY |
507 | static bool check_exported_symbol(const struct symsearch *syms, |
508 | struct module *owner, | |
509 | unsigned int symnum, void *data) | |
dafd0940 RR |
510 | { |
511 | struct find_symbol_arg *fsa = data; | |
512 | ||
dafd0940 RR |
513 | if (!fsa->gplok) { |
514 | if (syms->licence == GPL_ONLY) | |
515 | return false; | |
516 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
517 | pr_warn("Symbol %s is being used by a non-GPL module, " |
518 | "which will not be allowed in the future\n", | |
519 | fsa->name); | |
9f28bb7e | 520 | } |
1da177e4 | 521 | } |
ad9546c9 | 522 | |
f7f5b675 | 523 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 524 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
525 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
526 | "using it.\n", fsa->name); | |
527 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
528 | pr_warn("Please evaluate if this is the right api to use and " |
529 | "if it really is, submit a report to the linux kernel " | |
530 | "mailing list together with submitting your code for " | |
bddb12b3 | 531 | "inclusion.\n"); |
dafd0940 | 532 | } |
f7f5b675 | 533 | #endif |
dafd0940 RR |
534 | |
535 | fsa->owner = owner; | |
536 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 537 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
538 | return true; |
539 | } | |
540 | ||
7290d580 AB |
541 | static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
542 | { | |
543 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
544 | return (unsigned long)offset_to_ptr(&sym->value_offset); | |
545 | #else | |
546 | return sym->value; | |
547 | #endif | |
548 | } | |
549 | ||
550 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) | |
551 | { | |
552 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
553 | return offset_to_ptr(&sym->name_offset); | |
554 | #else | |
555 | return sym->name; | |
556 | #endif | |
557 | } | |
558 | ||
403ed278 AIB |
559 | static int cmp_name(const void *va, const void *vb) |
560 | { | |
561 | const char *a; | |
562 | const struct kernel_symbol *b; | |
563 | a = va; b = vb; | |
7290d580 | 564 | return strcmp(a, kernel_symbol_name(b)); |
403ed278 AIB |
565 | } |
566 | ||
2d25bc55 JY |
567 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
568 | struct module *owner, | |
569 | void *data) | |
de4d8d53 RR |
570 | { |
571 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
572 | struct kernel_symbol *sym; |
573 | ||
574 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
575 | sizeof(struct kernel_symbol), cmp_name); | |
576 | ||
2d25bc55 JY |
577 | if (sym != NULL && check_exported_symbol(syms, owner, |
578 | sym - syms->start, data)) | |
403ed278 | 579 | return true; |
de4d8d53 | 580 | |
de4d8d53 RR |
581 | return false; |
582 | } | |
583 | ||
2d25bc55 | 584 | /* Find an exported symbol and return it, along with, (optional) crc and |
75676500 | 585 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
586 | const struct kernel_symbol *find_symbol(const char *name, |
587 | struct module **owner, | |
71810db2 | 588 | const s32 **crc, |
c6b37801 TA |
589 | bool gplok, |
590 | bool warn) | |
dafd0940 RR |
591 | { |
592 | struct find_symbol_arg fsa; | |
593 | ||
594 | fsa.name = name; | |
595 | fsa.gplok = gplok; | |
596 | fsa.warn = warn; | |
597 | ||
2d25bc55 | 598 | if (each_symbol_section(find_exported_symbol_in_section, &fsa)) { |
dafd0940 RR |
599 | if (owner) |
600 | *owner = fsa.owner; | |
601 | if (crc) | |
602 | *crc = fsa.crc; | |
414fd31b | 603 | return fsa.sym; |
dafd0940 RR |
604 | } |
605 | ||
5e124169 | 606 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 607 | return NULL; |
1da177e4 | 608 | } |
c6b37801 | 609 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 610 | |
fe0d34d2 RR |
611 | /* |
612 | * Search for module by name: must hold module_mutex (or preempt disabled | |
613 | * for read-only access). | |
614 | */ | |
4f6de4d5 | 615 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 616 | bool even_unformed) |
1da177e4 LT |
617 | { |
618 | struct module *mod; | |
619 | ||
fe0d34d2 | 620 | module_assert_mutex_or_preempt(); |
0be964be | 621 | |
93437353 | 622 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
623 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
624 | continue; | |
4f6de4d5 | 625 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
626 | return mod; |
627 | } | |
628 | return NULL; | |
629 | } | |
0d21b0e3 RR |
630 | |
631 | struct module *find_module(const char *name) | |
632 | { | |
fe0d34d2 | 633 | module_assert_mutex(); |
4f6de4d5 | 634 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 635 | } |
c6b37801 | 636 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
637 | |
638 | #ifdef CONFIG_SMP | |
fbf59bc9 | 639 | |
259354de | 640 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 641 | { |
259354de TH |
642 | return mod->percpu; |
643 | } | |
fbf59bc9 | 644 | |
9eb76d77 | 645 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 646 | { |
9eb76d77 RR |
647 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
648 | unsigned long align = pcpusec->sh_addralign; | |
649 | ||
650 | if (!pcpusec->sh_size) | |
651 | return 0; | |
652 | ||
fbf59bc9 | 653 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
654 | pr_warn("%s: per-cpu alignment %li > %li\n", |
655 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
656 | align = PAGE_SIZE; |
657 | } | |
658 | ||
9eb76d77 | 659 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 660 | if (!mod->percpu) { |
bddb12b3 AM |
661 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
662 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
663 | return -ENOMEM; |
664 | } | |
9eb76d77 | 665 | mod->percpu_size = pcpusec->sh_size; |
259354de | 666 | return 0; |
fbf59bc9 TH |
667 | } |
668 | ||
259354de | 669 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 670 | { |
259354de | 671 | free_percpu(mod->percpu); |
fbf59bc9 TH |
672 | } |
673 | ||
49668688 | 674 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 675 | { |
49668688 | 676 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
677 | } |
678 | ||
259354de TH |
679 | static void percpu_modcopy(struct module *mod, |
680 | const void *from, unsigned long size) | |
6b588c18 TH |
681 | { |
682 | int cpu; | |
683 | ||
684 | for_each_possible_cpu(cpu) | |
259354de | 685 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
686 | } |
687 | ||
383776fa | 688 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
689 | { |
690 | struct module *mod; | |
691 | unsigned int cpu; | |
692 | ||
693 | preempt_disable(); | |
694 | ||
695 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
696 | if (mod->state == MODULE_STATE_UNFORMED) |
697 | continue; | |
10fad5e4 TH |
698 | if (!mod->percpu_size) |
699 | continue; | |
700 | for_each_possible_cpu(cpu) { | |
701 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 702 | void *va = (void *)addr; |
10fad5e4 | 703 | |
383776fa | 704 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 705 | if (can_addr) { |
383776fa | 706 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
707 | *can_addr += (unsigned long) |
708 | per_cpu_ptr(mod->percpu, | |
709 | get_boot_cpu_id()); | |
710 | } | |
10fad5e4 TH |
711 | preempt_enable(); |
712 | return true; | |
713 | } | |
714 | } | |
715 | } | |
716 | ||
717 | preempt_enable(); | |
718 | return false; | |
6b588c18 TH |
719 | } |
720 | ||
383776fa TG |
721 | /** |
722 | * is_module_percpu_address - test whether address is from module static percpu | |
723 | * @addr: address to test | |
724 | * | |
725 | * Test whether @addr belongs to module static percpu area. | |
726 | * | |
727 | * RETURNS: | |
728 | * %true if @addr is from module static percpu area | |
729 | */ | |
730 | bool is_module_percpu_address(unsigned long addr) | |
731 | { | |
732 | return __is_module_percpu_address(addr, NULL); | |
733 | } | |
734 | ||
1da177e4 | 735 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 736 | |
259354de | 737 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
738 | { |
739 | return NULL; | |
740 | } | |
9eb76d77 | 741 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 742 | { |
9eb76d77 RR |
743 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
744 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
745 | return -ENOMEM; | |
746 | return 0; | |
259354de TH |
747 | } |
748 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 749 | { |
1da177e4 | 750 | } |
49668688 | 751 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
752 | { |
753 | return 0; | |
754 | } | |
259354de TH |
755 | static inline void percpu_modcopy(struct module *mod, |
756 | const void *from, unsigned long size) | |
1da177e4 LT |
757 | { |
758 | /* pcpusec should be 0, and size of that section should be 0. */ | |
759 | BUG_ON(size != 0); | |
760 | } | |
10fad5e4 TH |
761 | bool is_module_percpu_address(unsigned long addr) |
762 | { | |
763 | return false; | |
764 | } | |
6b588c18 | 765 | |
383776fa TG |
766 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
767 | { | |
768 | return false; | |
769 | } | |
770 | ||
1da177e4 LT |
771 | #endif /* CONFIG_SMP */ |
772 | ||
c988d2b2 MD |
773 | #define MODINFO_ATTR(field) \ |
774 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
775 | { \ | |
776 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
777 | } \ | |
778 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 779 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 780 | { \ |
cc56ded3 | 781 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
782 | } \ |
783 | static int modinfo_##field##_exists(struct module *mod) \ | |
784 | { \ | |
785 | return mod->field != NULL; \ | |
786 | } \ | |
787 | static void free_modinfo_##field(struct module *mod) \ | |
788 | { \ | |
22a8bdeb DW |
789 | kfree(mod->field); \ |
790 | mod->field = NULL; \ | |
c988d2b2 MD |
791 | } \ |
792 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 793 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
794 | .show = show_modinfo_##field, \ |
795 | .setup = setup_modinfo_##field, \ | |
796 | .test = modinfo_##field##_exists, \ | |
797 | .free = free_modinfo_##field, \ | |
798 | }; | |
799 | ||
800 | MODINFO_ATTR(version); | |
801 | MODINFO_ATTR(srcversion); | |
802 | ||
e14af7ee AV |
803 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
804 | ||
03e88ae1 | 805 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
806 | |
807 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
808 | ||
e513cc1c MH |
809 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
810 | #define MODULE_REF_BASE 1 | |
811 | ||
1da177e4 | 812 | /* Init the unload section of the module. */ |
9f85a4bb | 813 | static int module_unload_init(struct module *mod) |
1da177e4 | 814 | { |
e513cc1c MH |
815 | /* |
816 | * Initialize reference counter to MODULE_REF_BASE. | |
817 | * refcnt == 0 means module is going. | |
818 | */ | |
819 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 820 | |
2c02dfe7 LT |
821 | INIT_LIST_HEAD(&mod->source_list); |
822 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 823 | |
1da177e4 | 824 | /* Hold reference count during initialization. */ |
e513cc1c | 825 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
826 | |
827 | return 0; | |
1da177e4 LT |
828 | } |
829 | ||
1da177e4 LT |
830 | /* Does a already use b? */ |
831 | static int already_uses(struct module *a, struct module *b) | |
832 | { | |
833 | struct module_use *use; | |
834 | ||
2c02dfe7 LT |
835 | list_for_each_entry(use, &b->source_list, source_list) { |
836 | if (use->source == a) { | |
5e124169 | 837 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
838 | return 1; |
839 | } | |
840 | } | |
5e124169 | 841 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
842 | return 0; |
843 | } | |
844 | ||
2c02dfe7 LT |
845 | /* |
846 | * Module a uses b | |
847 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
848 | * - the module_use is added to the list of 'b' sources (so | |
849 | * 'b' can walk the list to see who sourced them), and of 'a' | |
850 | * targets (so 'a' can see what modules it targets). | |
851 | */ | |
852 | static int add_module_usage(struct module *a, struct module *b) | |
853 | { | |
2c02dfe7 LT |
854 | struct module_use *use; |
855 | ||
5e124169 | 856 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 857 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 858 | if (!use) |
2c02dfe7 | 859 | return -ENOMEM; |
2c02dfe7 LT |
860 | |
861 | use->source = a; | |
862 | use->target = b; | |
863 | list_add(&use->source_list, &b->source_list); | |
864 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
865 | return 0; |
866 | } | |
867 | ||
75676500 | 868 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 869 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 870 | { |
c8e21ced | 871 | int err; |
270a6c4c | 872 | |
9bea7f23 | 873 | if (b == NULL || already_uses(a, b)) |
218ce735 | 874 | return 0; |
218ce735 | 875 | |
9bea7f23 RR |
876 | /* If module isn't available, we fail. */ |
877 | err = strong_try_module_get(b); | |
c9a3ba55 | 878 | if (err) |
9bea7f23 | 879 | return err; |
1da177e4 | 880 | |
2c02dfe7 LT |
881 | err = add_module_usage(a, b); |
882 | if (err) { | |
1da177e4 | 883 | module_put(b); |
9bea7f23 | 884 | return err; |
1da177e4 | 885 | } |
9bea7f23 | 886 | return 0; |
1da177e4 | 887 | } |
9bea7f23 | 888 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
889 | |
890 | /* Clear the unload stuff of the module. */ | |
891 | static void module_unload_free(struct module *mod) | |
892 | { | |
2c02dfe7 | 893 | struct module_use *use, *tmp; |
1da177e4 | 894 | |
75676500 | 895 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
896 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
897 | struct module *i = use->target; | |
5e124169 | 898 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
899 | module_put(i); |
900 | list_del(&use->source_list); | |
901 | list_del(&use->target_list); | |
902 | kfree(use); | |
1da177e4 | 903 | } |
75676500 | 904 | mutex_unlock(&module_mutex); |
1da177e4 LT |
905 | } |
906 | ||
907 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 908 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
909 | { |
910 | int ret = (flags & O_TRUNC); | |
911 | if (ret) | |
373d4d09 | 912 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
913 | return ret; |
914 | } | |
915 | #else | |
fb169793 | 916 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
917 | { |
918 | return 0; | |
919 | } | |
920 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
921 | ||
e513cc1c MH |
922 | /* Try to release refcount of module, 0 means success. */ |
923 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 924 | { |
e513cc1c | 925 | int ret; |
1da177e4 | 926 | |
e513cc1c MH |
927 | /* Try to decrement refcnt which we set at loading */ |
928 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
929 | BUG_ON(ret < 0); | |
930 | if (ret) | |
931 | /* Someone can put this right now, recover with checking */ | |
932 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 933 | |
e513cc1c MH |
934 | return ret; |
935 | } | |
1da177e4 | 936 | |
e513cc1c MH |
937 | static int try_stop_module(struct module *mod, int flags, int *forced) |
938 | { | |
da39ba5e | 939 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
940 | if (try_release_module_ref(mod) != 0) { |
941 | *forced = try_force_unload(flags); | |
942 | if (!(*forced)) | |
1da177e4 LT |
943 | return -EWOULDBLOCK; |
944 | } | |
945 | ||
946 | /* Mark it as dying. */ | |
e513cc1c | 947 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 948 | |
e513cc1c | 949 | return 0; |
1da177e4 LT |
950 | } |
951 | ||
d5db139a RR |
952 | /** |
953 | * module_refcount - return the refcount or -1 if unloading | |
954 | * | |
955 | * @mod: the module we're checking | |
956 | * | |
957 | * Returns: | |
958 | * -1 if the module is in the process of unloading | |
959 | * otherwise the number of references in the kernel to the module | |
960 | */ | |
961 | int module_refcount(struct module *mod) | |
1da177e4 | 962 | { |
d5db139a | 963 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
964 | } |
965 | EXPORT_SYMBOL(module_refcount); | |
966 | ||
967 | /* This exists whether we can unload or not */ | |
968 | static void free_module(struct module *mod); | |
969 | ||
17da2bd9 HC |
970 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
971 | unsigned int, flags) | |
1da177e4 LT |
972 | { |
973 | struct module *mod; | |
dfff0a06 | 974 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
975 | int ret, forced = 0; |
976 | ||
3d43321b | 977 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
978 | return -EPERM; |
979 | ||
980 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
981 | return -EFAULT; | |
982 | name[MODULE_NAME_LEN-1] = '\0'; | |
983 | ||
f6276ac9 RGB |
984 | audit_log_kern_module(name); |
985 | ||
3fc1f1e2 TH |
986 | if (mutex_lock_interruptible(&module_mutex) != 0) |
987 | return -EINTR; | |
1da177e4 LT |
988 | |
989 | mod = find_module(name); | |
990 | if (!mod) { | |
991 | ret = -ENOENT; | |
992 | goto out; | |
993 | } | |
994 | ||
2c02dfe7 | 995 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
996 | /* Other modules depend on us: get rid of them first. */ |
997 | ret = -EWOULDBLOCK; | |
998 | goto out; | |
999 | } | |
1000 | ||
1001 | /* Doing init or already dying? */ | |
1002 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 1003 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 1004 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
1005 | ret = -EBUSY; |
1006 | goto out; | |
1007 | } | |
1008 | ||
1009 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 1010 | if (mod->init && !mod->exit) { |
fb169793 | 1011 | forced = try_force_unload(flags); |
1da177e4 LT |
1012 | if (!forced) { |
1013 | /* This module can't be removed */ | |
1014 | ret = -EBUSY; | |
1015 | goto out; | |
1016 | } | |
1017 | } | |
1018 | ||
1da177e4 LT |
1019 | /* Stop the machine so refcounts can't move and disable module. */ |
1020 | ret = try_stop_module(mod, flags, &forced); | |
1021 | if (ret != 0) | |
1022 | goto out; | |
1023 | ||
df4b565e | 1024 | mutex_unlock(&module_mutex); |
25985edc | 1025 | /* Final destruction now no one is using it. */ |
df4b565e | 1026 | if (mod->exit != NULL) |
1da177e4 | 1027 | mod->exit(); |
df4b565e PO |
1028 | blocking_notifier_call_chain(&module_notify_list, |
1029 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1030 | klp_module_going(mod); |
7dcd182b JY |
1031 | ftrace_release_mod(mod); |
1032 | ||
22a9d645 | 1033 | async_synchronize_full(); |
75676500 | 1034 | |
e14af7ee | 1035 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1036 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1037 | |
75676500 RR |
1038 | free_module(mod); |
1039 | return 0; | |
1040 | out: | |
6389a385 | 1041 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1042 | return ret; |
1043 | } | |
1044 | ||
d1e99d7a | 1045 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1046 | { |
1047 | struct module_use *use; | |
1048 | int printed_something = 0; | |
1049 | ||
d5db139a | 1050 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1051 | |
6da0b565 IA |
1052 | /* |
1053 | * Always include a trailing , so userspace can differentiate | |
1054 | * between this and the old multi-field proc format. | |
1055 | */ | |
2c02dfe7 | 1056 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1057 | printed_something = 1; |
2c02dfe7 | 1058 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1059 | } |
1060 | ||
1da177e4 LT |
1061 | if (mod->init != NULL && mod->exit == NULL) { |
1062 | printed_something = 1; | |
6da0b565 | 1063 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | if (!printed_something) | |
6da0b565 | 1067 | seq_puts(m, "-"); |
1da177e4 LT |
1068 | } |
1069 | ||
1070 | void __symbol_put(const char *symbol) | |
1071 | { | |
1072 | struct module *owner; | |
1da177e4 | 1073 | |
24da1cbf | 1074 | preempt_disable(); |
414fd31b | 1075 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1076 | BUG(); |
1077 | module_put(owner); | |
24da1cbf | 1078 | preempt_enable(); |
1da177e4 LT |
1079 | } |
1080 | EXPORT_SYMBOL(__symbol_put); | |
1081 | ||
7d1d16e4 | 1082 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1083 | void symbol_put_addr(void *addr) |
1084 | { | |
5e376613 | 1085 | struct module *modaddr; |
7d1d16e4 | 1086 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1087 | |
7d1d16e4 | 1088 | if (core_kernel_text(a)) |
5e376613 | 1089 | return; |
1da177e4 | 1090 | |
275d7d44 PZ |
1091 | /* |
1092 | * Even though we hold a reference on the module; we still need to | |
1093 | * disable preemption in order to safely traverse the data structure. | |
1094 | */ | |
1095 | preempt_disable(); | |
7d1d16e4 | 1096 | modaddr = __module_text_address(a); |
a6e6abd5 | 1097 | BUG_ON(!modaddr); |
5e376613 | 1098 | module_put(modaddr); |
275d7d44 | 1099 | preempt_enable(); |
1da177e4 LT |
1100 | } |
1101 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1102 | ||
1103 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1104 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1105 | { |
d5db139a | 1106 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1107 | } |
1108 | ||
cca3e707 KS |
1109 | static struct module_attribute modinfo_refcnt = |
1110 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1111 | |
d53799be SR |
1112 | void __module_get(struct module *module) |
1113 | { | |
1114 | if (module) { | |
1115 | preempt_disable(); | |
2f35c41f | 1116 | atomic_inc(&module->refcnt); |
d53799be SR |
1117 | trace_module_get(module, _RET_IP_); |
1118 | preempt_enable(); | |
1119 | } | |
1120 | } | |
1121 | EXPORT_SYMBOL(__module_get); | |
1122 | ||
1123 | bool try_module_get(struct module *module) | |
1124 | { | |
1125 | bool ret = true; | |
1126 | ||
1127 | if (module) { | |
1128 | preempt_disable(); | |
e513cc1c MH |
1129 | /* Note: here, we can fail to get a reference */ |
1130 | if (likely(module_is_live(module) && | |
1131 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1132 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1133 | else |
d53799be SR |
1134 | ret = false; |
1135 | ||
1136 | preempt_enable(); | |
1137 | } | |
1138 | return ret; | |
1139 | } | |
1140 | EXPORT_SYMBOL(try_module_get); | |
1141 | ||
f6a57033 AV |
1142 | void module_put(struct module *module) |
1143 | { | |
e513cc1c MH |
1144 | int ret; |
1145 | ||
f6a57033 | 1146 | if (module) { |
e1783a24 | 1147 | preempt_disable(); |
e513cc1c MH |
1148 | ret = atomic_dec_if_positive(&module->refcnt); |
1149 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1150 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1151 | preempt_enable(); |
f6a57033 AV |
1152 | } |
1153 | } | |
1154 | EXPORT_SYMBOL(module_put); | |
1155 | ||
1da177e4 | 1156 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1157 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1158 | { |
1159 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1160 | seq_puts(m, " - -"); |
1da177e4 LT |
1161 | } |
1162 | ||
1163 | static inline void module_unload_free(struct module *mod) | |
1164 | { | |
1165 | } | |
1166 | ||
9bea7f23 | 1167 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1168 | { |
9bea7f23 | 1169 | return strong_try_module_get(b); |
1da177e4 | 1170 | } |
9bea7f23 | 1171 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1172 | |
9f85a4bb | 1173 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1174 | { |
9f85a4bb | 1175 | return 0; |
1da177e4 LT |
1176 | } |
1177 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1178 | ||
53999bf3 KW |
1179 | static size_t module_flags_taint(struct module *mod, char *buf) |
1180 | { | |
1181 | size_t l = 0; | |
7fd8329b PM |
1182 | int i; |
1183 | ||
1184 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1185 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1186 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1187 | } |
53999bf3 | 1188 | |
53999bf3 KW |
1189 | return l; |
1190 | } | |
1191 | ||
1f71740a | 1192 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1193 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1194 | { |
1195 | const char *state = "unknown"; | |
1196 | ||
4befb026 | 1197 | switch (mk->mod->state) { |
1f71740a KS |
1198 | case MODULE_STATE_LIVE: |
1199 | state = "live"; | |
1200 | break; | |
1201 | case MODULE_STATE_COMING: | |
1202 | state = "coming"; | |
1203 | break; | |
1204 | case MODULE_STATE_GOING: | |
1205 | state = "going"; | |
1206 | break; | |
0d21b0e3 RR |
1207 | default: |
1208 | BUG(); | |
1f71740a KS |
1209 | } |
1210 | return sprintf(buffer, "%s\n", state); | |
1211 | } | |
1212 | ||
cca3e707 KS |
1213 | static struct module_attribute modinfo_initstate = |
1214 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1215 | |
88bfa324 KS |
1216 | static ssize_t store_uevent(struct module_attribute *mattr, |
1217 | struct module_kobject *mk, | |
1218 | const char *buffer, size_t count) | |
1219 | { | |
df44b479 PR |
1220 | int rc; |
1221 | ||
1222 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1223 | return rc ? rc : count; | |
88bfa324 KS |
1224 | } |
1225 | ||
cca3e707 KS |
1226 | struct module_attribute module_uevent = |
1227 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1228 | ||
1229 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1230 | struct module_kobject *mk, char *buffer) | |
1231 | { | |
7523e4dc | 1232 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1233 | } |
1234 | ||
1235 | static struct module_attribute modinfo_coresize = | |
1236 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1237 | ||
1238 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1239 | struct module_kobject *mk, char *buffer) | |
1240 | { | |
7523e4dc | 1241 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1242 | } |
1243 | ||
1244 | static struct module_attribute modinfo_initsize = | |
1245 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1246 | ||
1247 | static ssize_t show_taint(struct module_attribute *mattr, | |
1248 | struct module_kobject *mk, char *buffer) | |
1249 | { | |
1250 | size_t l; | |
1251 | ||
1252 | l = module_flags_taint(mk->mod, buffer); | |
1253 | buffer[l++] = '\n'; | |
1254 | return l; | |
1255 | } | |
1256 | ||
1257 | static struct module_attribute modinfo_taint = | |
1258 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1259 | |
03e88ae1 | 1260 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1261 | &module_uevent, |
03e88ae1 GKH |
1262 | &modinfo_version, |
1263 | &modinfo_srcversion, | |
cca3e707 KS |
1264 | &modinfo_initstate, |
1265 | &modinfo_coresize, | |
1266 | &modinfo_initsize, | |
1267 | &modinfo_taint, | |
03e88ae1 | 1268 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1269 | &modinfo_refcnt, |
03e88ae1 GKH |
1270 | #endif |
1271 | NULL, | |
1272 | }; | |
1273 | ||
1da177e4 LT |
1274 | static const char vermagic[] = VERMAGIC_STRING; |
1275 | ||
c6e665c8 | 1276 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1277 | { |
1278 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1279 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1280 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1281 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1282 | return 0; |
1283 | #else | |
1284 | return -ENOEXEC; | |
1285 | #endif | |
1286 | } | |
1287 | ||
1da177e4 | 1288 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1289 | |
1290 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1291 | { |
71810db2 | 1292 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1293 | } |
1294 | ||
49019426 | 1295 | static int check_version(const struct load_info *info, |
1da177e4 | 1296 | const char *symname, |
6da0b565 | 1297 | struct module *mod, |
71810db2 | 1298 | const s32 *crc) |
1da177e4 | 1299 | { |
49019426 KC |
1300 | Elf_Shdr *sechdrs = info->sechdrs; |
1301 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1302 | unsigned int i, num_versions; |
1303 | struct modversion_info *versions; | |
1304 | ||
1305 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1306 | if (!crc) | |
1307 | return 1; | |
1308 | ||
a5dd6970 RR |
1309 | /* No versions at all? modprobe --force does this. */ |
1310 | if (versindex == 0) | |
1311 | return try_to_force_load(mod, symname) == 0; | |
1312 | ||
1da177e4 LT |
1313 | versions = (void *) sechdrs[versindex].sh_addr; |
1314 | num_versions = sechdrs[versindex].sh_size | |
1315 | / sizeof(struct modversion_info); | |
1316 | ||
1317 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1318 | u32 crcval; |
1319 | ||
1da177e4 LT |
1320 | if (strcmp(versions[i].name, symname) != 0) |
1321 | continue; | |
1322 | ||
71810db2 AB |
1323 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1324 | crcval = resolve_rel_crc(crc); | |
1325 | else | |
1326 | crcval = *crc; | |
1327 | if (versions[i].crc == crcval) | |
1da177e4 | 1328 | return 1; |
71810db2 AB |
1329 | pr_debug("Found checksum %X vs module %lX\n", |
1330 | crcval, versions[i].crc); | |
826e4506 | 1331 | goto bad_version; |
1da177e4 | 1332 | } |
826e4506 | 1333 | |
faaae2a5 | 1334 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1335 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1336 | return 1; |
826e4506 LT |
1337 | |
1338 | bad_version: | |
6da0b565 | 1339 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1340 | info->name, symname); |
826e4506 | 1341 | return 0; |
1da177e4 LT |
1342 | } |
1343 | ||
49019426 | 1344 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1345 | struct module *mod) |
1346 | { | |
71810db2 | 1347 | const s32 *crc; |
1da177e4 | 1348 | |
926a59b1 PZ |
1349 | /* |
1350 | * Since this should be found in kernel (which can't be removed), no | |
1351 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1352 | */ | |
1353 | preempt_disable(); | |
996302c5 | 1354 | if (!find_symbol("module_layout", NULL, &crc, true, false)) { |
926a59b1 | 1355 | preempt_enable(); |
1da177e4 | 1356 | BUG(); |
926a59b1 PZ |
1357 | } |
1358 | preempt_enable(); | |
996302c5 | 1359 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1360 | } |
1361 | ||
91e37a79 RR |
1362 | /* First part is kernel version, which we ignore if module has crcs. */ |
1363 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1364 | bool has_crcs) | |
1da177e4 | 1365 | { |
91e37a79 RR |
1366 | if (has_crcs) { |
1367 | amagic += strcspn(amagic, " "); | |
1368 | bmagic += strcspn(bmagic, " "); | |
1369 | } | |
1da177e4 LT |
1370 | return strcmp(amagic, bmagic) == 0; |
1371 | } | |
1372 | #else | |
49019426 | 1373 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1374 | const char *symname, |
6da0b565 | 1375 | struct module *mod, |
71810db2 | 1376 | const s32 *crc) |
1da177e4 LT |
1377 | { |
1378 | return 1; | |
1379 | } | |
1380 | ||
49019426 | 1381 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1382 | struct module *mod) |
1383 | { | |
1384 | return 1; | |
1385 | } | |
1386 | ||
91e37a79 RR |
1387 | static inline int same_magic(const char *amagic, const char *bmagic, |
1388 | bool has_crcs) | |
1da177e4 LT |
1389 | { |
1390 | return strcmp(amagic, bmagic) == 0; | |
1391 | } | |
1392 | #endif /* CONFIG_MODVERSIONS */ | |
1393 | ||
75676500 | 1394 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1395 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1396 | const struct load_info *info, | |
414fd31b | 1397 | const char *name, |
9bea7f23 | 1398 | char ownername[]) |
1da177e4 LT |
1399 | { |
1400 | struct module *owner; | |
414fd31b | 1401 | const struct kernel_symbol *sym; |
71810db2 | 1402 | const s32 *crc; |
9bea7f23 | 1403 | int err; |
1da177e4 | 1404 | |
d64810f5 PZ |
1405 | /* |
1406 | * The module_mutex should not be a heavily contended lock; | |
1407 | * if we get the occasional sleep here, we'll go an extra iteration | |
1408 | * in the wait_event_interruptible(), which is harmless. | |
1409 | */ | |
1410 | sched_annotate_sleep(); | |
75676500 | 1411 | mutex_lock(&module_mutex); |
414fd31b | 1412 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1413 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1414 | if (!sym) |
1415 | goto unlock; | |
1416 | ||
49019426 | 1417 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1418 | sym = ERR_PTR(-EINVAL); |
1419 | goto getname; | |
1da177e4 | 1420 | } |
9bea7f23 RR |
1421 | |
1422 | err = ref_module(mod, owner); | |
1423 | if (err) { | |
1424 | sym = ERR_PTR(err); | |
1425 | goto getname; | |
1426 | } | |
1427 | ||
1428 | getname: | |
1429 | /* We must make copy under the lock if we failed to get ref. */ | |
1430 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1431 | unlock: | |
75676500 | 1432 | mutex_unlock(&module_mutex); |
218ce735 | 1433 | return sym; |
1da177e4 LT |
1434 | } |
1435 | ||
49668688 RR |
1436 | static const struct kernel_symbol * |
1437 | resolve_symbol_wait(struct module *mod, | |
1438 | const struct load_info *info, | |
1439 | const char *name) | |
9bea7f23 RR |
1440 | { |
1441 | const struct kernel_symbol *ksym; | |
49668688 | 1442 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1443 | |
1444 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1445 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1446 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1447 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1448 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1449 | mod->name, owner); | |
9bea7f23 RR |
1450 | } |
1451 | return ksym; | |
1452 | } | |
1453 | ||
1da177e4 LT |
1454 | /* |
1455 | * /sys/module/foo/sections stuff | |
1456 | * J. Corbet <corbet@lwn.net> | |
1457 | */ | |
8f6d0378 | 1458 | #ifdef CONFIG_SYSFS |
10b465aa | 1459 | |
8f6d0378 | 1460 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1461 | static inline bool sect_empty(const Elf_Shdr *sect) |
1462 | { | |
1463 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1464 | } | |
1465 | ||
6da0b565 | 1466 | struct module_sect_attr { |
a58730c4 RR |
1467 | struct module_attribute mattr; |
1468 | char *name; | |
1469 | unsigned long address; | |
1470 | }; | |
1471 | ||
6da0b565 | 1472 | struct module_sect_attrs { |
a58730c4 RR |
1473 | struct attribute_group grp; |
1474 | unsigned int nsections; | |
1475 | struct module_sect_attr attrs[0]; | |
1476 | }; | |
1477 | ||
1da177e4 | 1478 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1479 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1480 | { |
1481 | struct module_sect_attr *sattr = | |
1482 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1483 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1484 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1485 | } |
1486 | ||
04b1db9f IN |
1487 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1488 | { | |
a58730c4 | 1489 | unsigned int section; |
04b1db9f IN |
1490 | |
1491 | for (section = 0; section < sect_attrs->nsections; section++) | |
1492 | kfree(sect_attrs->attrs[section].name); | |
1493 | kfree(sect_attrs); | |
1494 | } | |
1495 | ||
8f6d0378 | 1496 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1497 | { |
1498 | unsigned int nloaded = 0, i, size[2]; | |
1499 | struct module_sect_attrs *sect_attrs; | |
1500 | struct module_sect_attr *sattr; | |
1501 | struct attribute **gattr; | |
22a8bdeb | 1502 | |
1da177e4 | 1503 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1504 | for (i = 0; i < info->hdr->e_shnum; i++) |
1505 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1506 | nloaded++; |
1507 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1508 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1509 | sizeof(sect_attrs->grp.attrs[0])); | |
1510 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1511 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1512 | if (sect_attrs == NULL) | |
1da177e4 LT |
1513 | return; |
1514 | ||
1515 | /* Setup section attributes. */ | |
1516 | sect_attrs->grp.name = "sections"; | |
1517 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1518 | ||
04b1db9f | 1519 | sect_attrs->nsections = 0; |
1da177e4 LT |
1520 | sattr = §_attrs->attrs[0]; |
1521 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1522 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1523 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1524 | if (sect_empty(sec)) | |
35dead42 | 1525 | continue; |
8f6d0378 RR |
1526 | sattr->address = sec->sh_addr; |
1527 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1528 | GFP_KERNEL); |
1529 | if (sattr->name == NULL) | |
1530 | goto out; | |
1531 | sect_attrs->nsections++; | |
361795b1 | 1532 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1533 | sattr->mattr.show = module_sect_show; |
1534 | sattr->mattr.store = NULL; | |
1535 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1536 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1537 | *(gattr++) = &(sattr++)->mattr.attr; |
1538 | } | |
1539 | *gattr = NULL; | |
1540 | ||
1541 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1542 | goto out; | |
1543 | ||
1544 | mod->sect_attrs = sect_attrs; | |
1545 | return; | |
1546 | out: | |
04b1db9f | 1547 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1548 | } |
1549 | ||
1550 | static void remove_sect_attrs(struct module *mod) | |
1551 | { | |
1552 | if (mod->sect_attrs) { | |
1553 | sysfs_remove_group(&mod->mkobj.kobj, | |
1554 | &mod->sect_attrs->grp); | |
1555 | /* We are positive that no one is using any sect attrs | |
1556 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1557 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1558 | mod->sect_attrs = NULL; |
1559 | } | |
1560 | } | |
1561 | ||
6d760133 RM |
1562 | /* |
1563 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1564 | */ | |
1565 | ||
1566 | struct module_notes_attrs { | |
1567 | struct kobject *dir; | |
1568 | unsigned int notes; | |
1569 | struct bin_attribute attrs[0]; | |
1570 | }; | |
1571 | ||
2c3c8bea | 1572 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1573 | struct bin_attribute *bin_attr, |
1574 | char *buf, loff_t pos, size_t count) | |
1575 | { | |
1576 | /* | |
1577 | * The caller checked the pos and count against our size. | |
1578 | */ | |
1579 | memcpy(buf, bin_attr->private + pos, count); | |
1580 | return count; | |
1581 | } | |
1582 | ||
1583 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1584 | unsigned int i) | |
1585 | { | |
1586 | if (notes_attrs->dir) { | |
1587 | while (i-- > 0) | |
1588 | sysfs_remove_bin_file(notes_attrs->dir, | |
1589 | ¬es_attrs->attrs[i]); | |
e9432093 | 1590 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1591 | } |
1592 | kfree(notes_attrs); | |
1593 | } | |
1594 | ||
8f6d0378 | 1595 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1596 | { |
1597 | unsigned int notes, loaded, i; | |
1598 | struct module_notes_attrs *notes_attrs; | |
1599 | struct bin_attribute *nattr; | |
1600 | ||
ea6bff36 IM |
1601 | /* failed to create section attributes, so can't create notes */ |
1602 | if (!mod->sect_attrs) | |
1603 | return; | |
1604 | ||
6d760133 RM |
1605 | /* Count notes sections and allocate structures. */ |
1606 | notes = 0; | |
8f6d0378 RR |
1607 | for (i = 0; i < info->hdr->e_shnum; i++) |
1608 | if (!sect_empty(&info->sechdrs[i]) && | |
1609 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1610 | ++notes; |
1611 | ||
1612 | if (notes == 0) | |
1613 | return; | |
1614 | ||
acafe7e3 | 1615 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1616 | GFP_KERNEL); |
1617 | if (notes_attrs == NULL) | |
1618 | return; | |
1619 | ||
1620 | notes_attrs->notes = notes; | |
1621 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1622 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1623 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1624 | continue; |
8f6d0378 | 1625 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1626 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1627 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1628 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1629 | nattr->size = info->sechdrs[i].sh_size; |
1630 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1631 | nattr->read = module_notes_read; |
1632 | ++nattr; | |
1633 | } | |
1634 | ++loaded; | |
1635 | } | |
1636 | ||
4ff6abff | 1637 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1638 | if (!notes_attrs->dir) |
1639 | goto out; | |
1640 | ||
1641 | for (i = 0; i < notes; ++i) | |
1642 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1643 | ¬es_attrs->attrs[i])) | |
1644 | goto out; | |
1645 | ||
1646 | mod->notes_attrs = notes_attrs; | |
1647 | return; | |
1648 | ||
1649 | out: | |
1650 | free_notes_attrs(notes_attrs, i); | |
1651 | } | |
1652 | ||
1653 | static void remove_notes_attrs(struct module *mod) | |
1654 | { | |
1655 | if (mod->notes_attrs) | |
1656 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1657 | } | |
1658 | ||
1da177e4 | 1659 | #else |
04b1db9f | 1660 | |
8f6d0378 RR |
1661 | static inline void add_sect_attrs(struct module *mod, |
1662 | const struct load_info *info) | |
1da177e4 LT |
1663 | { |
1664 | } | |
1665 | ||
1666 | static inline void remove_sect_attrs(struct module *mod) | |
1667 | { | |
1668 | } | |
6d760133 | 1669 | |
8f6d0378 RR |
1670 | static inline void add_notes_attrs(struct module *mod, |
1671 | const struct load_info *info) | |
6d760133 RM |
1672 | { |
1673 | } | |
1674 | ||
1675 | static inline void remove_notes_attrs(struct module *mod) | |
1676 | { | |
1677 | } | |
8f6d0378 | 1678 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1679 | |
1ba5c08b | 1680 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1681 | { |
1682 | #ifdef CONFIG_MODULE_UNLOAD | |
1683 | struct module_use *use; | |
80a3d1bb | 1684 | |
75676500 | 1685 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1686 | list_for_each_entry(use, &mod->target_list, target_list) |
1687 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1688 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1689 | #endif |
1690 | } | |
1691 | ||
1ba5c08b | 1692 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1693 | { |
1ba5c08b | 1694 | int ret = 0; |
80a3d1bb RR |
1695 | #ifdef CONFIG_MODULE_UNLOAD |
1696 | struct module_use *use; | |
1697 | ||
75676500 | 1698 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1699 | list_for_each_entry(use, &mod->target_list, target_list) { |
1700 | ret = sysfs_create_link(use->target->holders_dir, | |
1701 | &mod->mkobj.kobj, mod->name); | |
1702 | if (ret) | |
1703 | break; | |
1704 | } | |
75676500 | 1705 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1706 | if (ret) |
1707 | del_usage_links(mod); | |
80a3d1bb | 1708 | #endif |
1ba5c08b | 1709 | return ret; |
80a3d1bb RR |
1710 | } |
1711 | ||
6407ebb2 | 1712 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1713 | { |
1714 | struct module_attribute *attr; | |
03e88ae1 | 1715 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1716 | int error = 0; |
1717 | int i; | |
1718 | ||
03e88ae1 GKH |
1719 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1720 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1721 | GFP_KERNEL); | |
1722 | if (!mod->modinfo_attrs) | |
1723 | return -ENOMEM; | |
1724 | ||
1725 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 | 1726 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
c75b590d | 1727 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1728 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1729 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1730 | error = sysfs_create_file(&mod->mkobj.kobj, |
1731 | &temp_attr->attr); | |
03e88ae1 GKH |
1732 | ++temp_attr; |
1733 | } | |
c988d2b2 MD |
1734 | } |
1735 | return error; | |
1736 | } | |
1737 | ||
6407ebb2 | 1738 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1739 | { |
1740 | struct module_attribute *attr; | |
1741 | int i; | |
1742 | ||
03e88ae1 GKH |
1743 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1744 | /* pick a field to test for end of list */ | |
1745 | if (!attr->attr.name) | |
1746 | break; | |
6da0b565 | 1747 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1748 | if (attr->free) |
1749 | attr->free(mod); | |
c988d2b2 | 1750 | } |
03e88ae1 | 1751 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1752 | } |
1da177e4 | 1753 | |
942e4431 LZ |
1754 | static void mod_kobject_put(struct module *mod) |
1755 | { | |
1756 | DECLARE_COMPLETION_ONSTACK(c); | |
1757 | mod->mkobj.kobj_completion = &c; | |
1758 | kobject_put(&mod->mkobj.kobj); | |
1759 | wait_for_completion(&c); | |
1760 | } | |
1761 | ||
6407ebb2 | 1762 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1763 | { |
1764 | int err; | |
6494a93d | 1765 | struct kobject *kobj; |
1da177e4 | 1766 | |
823bccfc | 1767 | if (!module_sysfs_initialized) { |
bddb12b3 | 1768 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1769 | err = -EINVAL; |
1770 | goto out; | |
1771 | } | |
6494a93d GKH |
1772 | |
1773 | kobj = kset_find_obj(module_kset, mod->name); | |
1774 | if (kobj) { | |
bddb12b3 | 1775 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1776 | kobject_put(kobj); |
1777 | err = -EINVAL; | |
1778 | goto out; | |
1779 | } | |
1780 | ||
1da177e4 | 1781 | mod->mkobj.mod = mod; |
e17e0f51 | 1782 | |
ac3c8141 GKH |
1783 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1784 | mod->mkobj.kobj.kset = module_kset; | |
1785 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1786 | "%s", mod->name); | |
1787 | if (err) | |
942e4431 | 1788 | mod_kobject_put(mod); |
270a6c4c | 1789 | |
97c146ef | 1790 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1791 | out: |
1792 | return err; | |
1793 | } | |
1794 | ||
6407ebb2 | 1795 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1796 | const struct load_info *info, |
270a6c4c KS |
1797 | struct kernel_param *kparam, |
1798 | unsigned int num_params) | |
1799 | { | |
1800 | int err; | |
1801 | ||
80a3d1bb RR |
1802 | err = mod_sysfs_init(mod); |
1803 | if (err) | |
1804 | goto out; | |
1805 | ||
4ff6abff | 1806 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1807 | if (!mod->holders_dir) { |
1808 | err = -ENOMEM; | |
270a6c4c | 1809 | goto out_unreg; |
240936e1 | 1810 | } |
270a6c4c | 1811 | |
1da177e4 LT |
1812 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1813 | if (err) | |
270a6c4c | 1814 | goto out_unreg_holders; |
1da177e4 | 1815 | |
c988d2b2 MD |
1816 | err = module_add_modinfo_attrs(mod); |
1817 | if (err) | |
e17e0f51 | 1818 | goto out_unreg_param; |
c988d2b2 | 1819 | |
1ba5c08b CL |
1820 | err = add_usage_links(mod); |
1821 | if (err) | |
1822 | goto out_unreg_modinfo_attrs; | |
1823 | ||
8f6d0378 RR |
1824 | add_sect_attrs(mod, info); |
1825 | add_notes_attrs(mod, info); | |
80a3d1bb | 1826 | |
e17e0f51 | 1827 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1828 | return 0; |
1829 | ||
1ba5c08b CL |
1830 | out_unreg_modinfo_attrs: |
1831 | module_remove_modinfo_attrs(mod); | |
e17e0f51 KS |
1832 | out_unreg_param: |
1833 | module_param_sysfs_remove(mod); | |
270a6c4c | 1834 | out_unreg_holders: |
78a2d906 | 1835 | kobject_put(mod->holders_dir); |
270a6c4c | 1836 | out_unreg: |
942e4431 | 1837 | mod_kobject_put(mod); |
80a3d1bb | 1838 | out: |
1da177e4 LT |
1839 | return err; |
1840 | } | |
34e4e2fe DL |
1841 | |
1842 | static void mod_sysfs_fini(struct module *mod) | |
1843 | { | |
8f6d0378 RR |
1844 | remove_notes_attrs(mod); |
1845 | remove_sect_attrs(mod); | |
942e4431 | 1846 | mod_kobject_put(mod); |
34e4e2fe DL |
1847 | } |
1848 | ||
cf2fde7b RR |
1849 | static void init_param_lock(struct module *mod) |
1850 | { | |
1851 | mutex_init(&mod->param_lock); | |
1852 | } | |
8f6d0378 | 1853 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1854 | |
8f6d0378 RR |
1855 | static int mod_sysfs_setup(struct module *mod, |
1856 | const struct load_info *info, | |
6407ebb2 RR |
1857 | struct kernel_param *kparam, |
1858 | unsigned int num_params) | |
1859 | { | |
1860 | return 0; | |
1861 | } | |
1862 | ||
34e4e2fe DL |
1863 | static void mod_sysfs_fini(struct module *mod) |
1864 | { | |
1865 | } | |
1866 | ||
36b0360d RR |
1867 | static void module_remove_modinfo_attrs(struct module *mod) |
1868 | { | |
1869 | } | |
1870 | ||
80a3d1bb RR |
1871 | static void del_usage_links(struct module *mod) |
1872 | { | |
1873 | } | |
1874 | ||
cf2fde7b RR |
1875 | static void init_param_lock(struct module *mod) |
1876 | { | |
1877 | } | |
34e4e2fe | 1878 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1879 | |
36b0360d | 1880 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1881 | { |
80a3d1bb | 1882 | del_usage_links(mod); |
c988d2b2 | 1883 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1884 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1885 | kobject_put(mod->mkobj.drivers_dir); |
1886 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1887 | mod_sysfs_fini(mod); |
1da177e4 LT |
1888 | } |
1889 | ||
0f5bf6d0 | 1890 | #ifdef CONFIG_STRICT_MODULE_RWX |
84e1c6bb MC |
1891 | /* |
1892 | * LKM RO/NX protection: protect module's text/ro-data | |
1893 | * from modification and any data from execution. | |
85c898db RR |
1894 | * |
1895 | * General layout of module is: | |
444d13ff JY |
1896 | * [text] [read-only-data] [ro-after-init] [writable data] |
1897 | * text_size -----^ ^ ^ ^ | |
1898 | * ro_size ------------------------| | | | |
1899 | * ro_after_init_size -----------------------------| | | |
1900 | * size -----------------------------------------------------------| | |
85c898db RR |
1901 | * |
1902 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1903 | */ |
85c898db RR |
1904 | static void frob_text(const struct module_layout *layout, |
1905 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1906 | { |
85c898db RR |
1907 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1908 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1909 | set_memory((unsigned long)layout->base, | |
1910 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1911 | } |
84e1c6bb | 1912 | |
85c898db RR |
1913 | static void frob_rodata(const struct module_layout *layout, |
1914 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1915 | { |
85c898db RR |
1916 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1917 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1918 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1919 | set_memory((unsigned long)layout->base + layout->text_size, | |
1920 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1921 | } |
1922 | ||
444d13ff JY |
1923 | static void frob_ro_after_init(const struct module_layout *layout, |
1924 | int (*set_memory)(unsigned long start, int num_pages)) | |
1925 | { | |
1926 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1927 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1928 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1929 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1930 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1931 | } | |
1932 | ||
85c898db RR |
1933 | static void frob_writable_data(const struct module_layout *layout, |
1934 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1935 | { |
85c898db | 1936 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1937 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1938 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1939 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1940 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1941 | } |
84e1c6bb | 1942 | |
85c898db RR |
1943 | /* livepatching wants to disable read-only so it can frob module. */ |
1944 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1945 | { |
39290b38 AT |
1946 | if (!rodata_enabled) |
1947 | return; | |
1948 | ||
85c898db RR |
1949 | frob_text(&mod->core_layout, set_memory_rw); |
1950 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 1951 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
1952 | frob_text(&mod->init_layout, set_memory_rw); |
1953 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1954 | } |
84e1c6bb | 1955 | |
444d13ff | 1956 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 1957 | { |
39290b38 AT |
1958 | if (!rodata_enabled) |
1959 | return; | |
1960 | ||
1a7b7d92 RE |
1961 | set_vm_flush_reset_perms(mod->core_layout.base); |
1962 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 1963 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 NA |
1964 | frob_text(&mod->core_layout, set_memory_x); |
1965 | ||
85c898db | 1966 | frob_rodata(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 1967 | |
85c898db | 1968 | frob_text(&mod->init_layout, set_memory_ro); |
f2c65fb3 NA |
1969 | frob_text(&mod->init_layout, set_memory_x); |
1970 | ||
85c898db | 1971 | frob_rodata(&mod->init_layout, set_memory_ro); |
444d13ff JY |
1972 | |
1973 | if (after_init) | |
1974 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
1975 | } |
1976 | ||
85c898db | 1977 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 1978 | { |
85c898db | 1979 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 1980 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
1981 | frob_writable_data(&mod->core_layout, set_memory_nx); |
1982 | frob_rodata(&mod->init_layout, set_memory_nx); | |
1983 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
1984 | } |
1985 | ||
84e1c6bb | 1986 | /* Iterate through all modules and set each module's text as RW */ |
5d05c708 | 1987 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
1988 | { |
1989 | struct module *mod; | |
1990 | ||
39290b38 AT |
1991 | if (!rodata_enabled) |
1992 | return; | |
1993 | ||
84e1c6bb MC |
1994 | mutex_lock(&module_mutex); |
1995 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1996 | if (mod->state == MODULE_STATE_UNFORMED) |
1997 | continue; | |
85c898db RR |
1998 | |
1999 | frob_text(&mod->core_layout, set_memory_rw); | |
2000 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb MC |
2001 | } |
2002 | mutex_unlock(&module_mutex); | |
2003 | } | |
2004 | ||
2005 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 2006 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
2007 | { |
2008 | struct module *mod; | |
2009 | ||
39290b38 AT |
2010 | if (!rodata_enabled) |
2011 | return; | |
2012 | ||
84e1c6bb MC |
2013 | mutex_lock(&module_mutex); |
2014 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
2015 | /* |
2016 | * Ignore going modules since it's possible that ro | |
2017 | * protection has already been disabled, otherwise we'll | |
2018 | * run into protection faults at module deallocation. | |
2019 | */ | |
2020 | if (mod->state == MODULE_STATE_UNFORMED || | |
2021 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 2022 | continue; |
85c898db RR |
2023 | |
2024 | frob_text(&mod->core_layout, set_memory_ro); | |
2025 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb MC |
2026 | } |
2027 | mutex_unlock(&module_mutex); | |
2028 | } | |
2029 | #else | |
85c898db | 2030 | static void module_enable_nx(const struct module *mod) { } |
84e1c6bb MC |
2031 | #endif |
2032 | ||
1ce15ef4 JY |
2033 | #ifdef CONFIG_LIVEPATCH |
2034 | /* | |
2035 | * Persist Elf information about a module. Copy the Elf header, | |
2036 | * section header table, section string table, and symtab section | |
2037 | * index from info to mod->klp_info. | |
2038 | */ | |
2039 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2040 | { | |
2041 | unsigned int size, symndx; | |
2042 | int ret; | |
2043 | ||
2044 | size = sizeof(*mod->klp_info); | |
2045 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2046 | if (mod->klp_info == NULL) | |
2047 | return -ENOMEM; | |
2048 | ||
2049 | /* Elf header */ | |
2050 | size = sizeof(mod->klp_info->hdr); | |
2051 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2052 | ||
2053 | /* Elf section header table */ | |
2054 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2055 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2056 | if (mod->klp_info->sechdrs == NULL) { |
2057 | ret = -ENOMEM; | |
2058 | goto free_info; | |
2059 | } | |
1ce15ef4 JY |
2060 | |
2061 | /* Elf section name string table */ | |
2062 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2063 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2064 | if (mod->klp_info->secstrings == NULL) { |
2065 | ret = -ENOMEM; | |
2066 | goto free_sechdrs; | |
2067 | } | |
1ce15ef4 JY |
2068 | |
2069 | /* Elf symbol section index */ | |
2070 | symndx = info->index.sym; | |
2071 | mod->klp_info->symndx = symndx; | |
2072 | ||
2073 | /* | |
2074 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2075 | * copy of the original symbol table. Adjust sh_addr to point | |
2076 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2077 | * init memory is freed at the end of do_init_module(). | |
2078 | */ | |
2079 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2080 | (unsigned long) mod->core_kallsyms.symtab; | |
2081 | ||
2082 | return 0; | |
2083 | ||
2084 | free_sechdrs: | |
2085 | kfree(mod->klp_info->sechdrs); | |
2086 | free_info: | |
2087 | kfree(mod->klp_info); | |
2088 | return ret; | |
2089 | } | |
2090 | ||
2091 | static void free_module_elf(struct module *mod) | |
2092 | { | |
2093 | kfree(mod->klp_info->sechdrs); | |
2094 | kfree(mod->klp_info->secstrings); | |
2095 | kfree(mod->klp_info); | |
2096 | } | |
2097 | #else /* !CONFIG_LIVEPATCH */ | |
2098 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2099 | { | |
2100 | return 0; | |
2101 | } | |
2102 | ||
2103 | static void free_module_elf(struct module *mod) | |
2104 | { | |
2105 | } | |
2106 | #endif /* CONFIG_LIVEPATCH */ | |
2107 | ||
be1f221c | 2108 | void __weak module_memfree(void *module_region) |
74e08fcf | 2109 | { |
1a7b7d92 RE |
2110 | /* |
2111 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2112 | * supported by vmalloc. | |
2113 | */ | |
2114 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2115 | vfree(module_region); |
2116 | } | |
2117 | ||
2118 | void __weak module_arch_cleanup(struct module *mod) | |
2119 | { | |
2120 | } | |
2121 | ||
d453cded RR |
2122 | void __weak module_arch_freeing_init(struct module *mod) |
2123 | { | |
2124 | } | |
2125 | ||
75676500 | 2126 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2127 | static void free_module(struct module *mod) |
2128 | { | |
7ead8b83 LZ |
2129 | trace_module_free(mod); |
2130 | ||
36b0360d | 2131 | mod_sysfs_teardown(mod); |
1da177e4 | 2132 | |
944a1fa0 RR |
2133 | /* We leave it in list to prevent duplicate loads, but make sure |
2134 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2135 | mutex_lock(&module_mutex); |
944a1fa0 | 2136 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2137 | mutex_unlock(&module_mutex); |
944a1fa0 | 2138 | |
b82bab4b JB |
2139 | /* Remove dynamic debug info */ |
2140 | ddebug_remove_module(mod->name); | |
2141 | ||
1da177e4 LT |
2142 | /* Arch-specific cleanup. */ |
2143 | module_arch_cleanup(mod); | |
2144 | ||
2145 | /* Module unload stuff */ | |
2146 | module_unload_free(mod); | |
2147 | ||
e180a6b7 RR |
2148 | /* Free any allocated parameters. */ |
2149 | destroy_params(mod->kp, mod->num_kp); | |
2150 | ||
1ce15ef4 JY |
2151 | if (is_livepatch_module(mod)) |
2152 | free_module_elf(mod); | |
2153 | ||
944a1fa0 RR |
2154 | /* Now we can delete it from the lists */ |
2155 | mutex_lock(&module_mutex); | |
461e34ae MH |
2156 | /* Unlink carefully: kallsyms could be walking list. */ |
2157 | list_del_rcu(&mod->list); | |
93c2e105 | 2158 | mod_tree_remove(mod); |
0286b5ea | 2159 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2160 | module_bug_cleanup(mod); |
0be964be | 2161 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2162 | synchronize_rcu(); |
944a1fa0 RR |
2163 | mutex_unlock(&module_mutex); |
2164 | ||
85c898db | 2165 | /* This may be empty, but that's OK */ |
d453cded | 2166 | module_arch_freeing_init(mod); |
7523e4dc | 2167 | module_memfree(mod->init_layout.base); |
1da177e4 | 2168 | kfree(mod->args); |
259354de | 2169 | percpu_modfree(mod); |
9f85a4bb | 2170 | |
35a9393c | 2171 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2172 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2173 | |
1da177e4 | 2174 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2175 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2176 | } |
2177 | ||
2178 | void *__symbol_get(const char *symbol) | |
2179 | { | |
2180 | struct module *owner; | |
414fd31b | 2181 | const struct kernel_symbol *sym; |
1da177e4 | 2182 | |
24da1cbf | 2183 | preempt_disable(); |
414fd31b TA |
2184 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2185 | if (sym && strong_try_module_get(owner)) | |
2186 | sym = NULL; | |
24da1cbf | 2187 | preempt_enable(); |
1da177e4 | 2188 | |
7290d580 | 2189 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2190 | } |
2191 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2192 | ||
eea8b54d AN |
2193 | /* |
2194 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2195 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2196 | * |
2197 | * You must hold the module_mutex. | |
eea8b54d | 2198 | */ |
2d25bc55 | 2199 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2200 | { |
b211104d | 2201 | unsigned int i; |
eea8b54d | 2202 | struct module *owner; |
b211104d RR |
2203 | const struct kernel_symbol *s; |
2204 | struct { | |
2205 | const struct kernel_symbol *sym; | |
2206 | unsigned int num; | |
2207 | } arr[] = { | |
2208 | { mod->syms, mod->num_syms }, | |
2209 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2210 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2211 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2212 | { mod->unused_syms, mod->num_unused_syms }, |
2213 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2214 | #endif |
b211104d | 2215 | }; |
eea8b54d | 2216 | |
b211104d RR |
2217 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2218 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 AB |
2219 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
2220 | true, false)) { | |
bddb12b3 | 2221 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2222 | " (owned by %s)\n", |
7290d580 AB |
2223 | mod->name, kernel_symbol_name(s), |
2224 | module_name(owner)); | |
b211104d RR |
2225 | return -ENOEXEC; |
2226 | } | |
eea8b54d | 2227 | } |
b211104d RR |
2228 | } |
2229 | return 0; | |
eea8b54d AN |
2230 | } |
2231 | ||
9a4b9708 | 2232 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2233 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2234 | { | |
2235 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2236 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2237 | unsigned long secbase; |
49668688 | 2238 | unsigned int i; |
1da177e4 | 2239 | int ret = 0; |
414fd31b | 2240 | const struct kernel_symbol *ksym; |
1da177e4 | 2241 | |
49668688 RR |
2242 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2243 | const char *name = info->strtab + sym[i].st_name; | |
2244 | ||
1da177e4 LT |
2245 | switch (sym[i].st_shndx) { |
2246 | case SHN_COMMON: | |
80375980 JM |
2247 | /* Ignore common symbols */ |
2248 | if (!strncmp(name, "__gnu_lto", 9)) | |
2249 | break; | |
2250 | ||
1da177e4 LT |
2251 | /* We compiled with -fno-common. These are not |
2252 | supposed to happen. */ | |
5e124169 | 2253 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2254 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2255 | mod->name); |
2256 | ret = -ENOEXEC; | |
2257 | break; | |
2258 | ||
2259 | case SHN_ABS: | |
2260 | /* Don't need to do anything */ | |
5e124169 | 2261 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2262 | (long)sym[i].st_value); |
2263 | break; | |
2264 | ||
1ce15ef4 JY |
2265 | case SHN_LIVEPATCH: |
2266 | /* Livepatch symbols are resolved by livepatch */ | |
2267 | break; | |
2268 | ||
1da177e4 | 2269 | case SHN_UNDEF: |
49668688 | 2270 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2271 | /* Ok if resolved. */ |
9bea7f23 | 2272 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2273 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2274 | break; |
414fd31b TA |
2275 | } |
2276 | ||
1da177e4 | 2277 | /* Ok if weak. */ |
9bea7f23 | 2278 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2279 | break; |
2280 | ||
9bea7f23 | 2281 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2282 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2283 | mod->name, name, ret); | |
1da177e4 LT |
2284 | break; |
2285 | ||
2286 | default: | |
2287 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2288 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2289 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2290 | else |
49668688 | 2291 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2292 | sym[i].st_value += secbase; |
2293 | break; | |
2294 | } | |
2295 | } | |
2296 | ||
2297 | return ret; | |
2298 | } | |
2299 | ||
49668688 | 2300 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2301 | { |
2302 | unsigned int i; | |
2303 | int err = 0; | |
2304 | ||
2305 | /* Now do relocations. */ | |
49668688 RR |
2306 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2307 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2308 | |
2309 | /* Not a valid relocation section? */ | |
49668688 | 2310 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2311 | continue; |
2312 | ||
2313 | /* Don't bother with non-allocated sections */ | |
49668688 | 2314 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2315 | continue; |
2316 | ||
1ce15ef4 JY |
2317 | /* Livepatch relocation sections are applied by livepatch */ |
2318 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2319 | continue; | |
2320 | ||
49668688 RR |
2321 | if (info->sechdrs[i].sh_type == SHT_REL) |
2322 | err = apply_relocate(info->sechdrs, info->strtab, | |
2323 | info->index.sym, i, mod); | |
2324 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2325 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2326 | info->index.sym, i, mod); | |
22e268eb RR |
2327 | if (err < 0) |
2328 | break; | |
2329 | } | |
2330 | return err; | |
2331 | } | |
2332 | ||
088af9a6 HD |
2333 | /* Additional bytes needed by arch in front of individual sections */ |
2334 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2335 | unsigned int section) | |
2336 | { | |
2337 | /* default implementation just returns zero */ | |
2338 | return 0; | |
2339 | } | |
2340 | ||
1da177e4 | 2341 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2342 | static long get_offset(struct module *mod, unsigned int *size, |
2343 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2344 | { |
2345 | long ret; | |
2346 | ||
088af9a6 | 2347 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2348 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2349 | *size = ret + sechdr->sh_size; | |
2350 | return ret; | |
2351 | } | |
2352 | ||
2353 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2354 | might -- code, read-only data, read-write data, small data. Tally | |
2355 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2356 | belongs in init. */ | |
49668688 | 2357 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2358 | { |
2359 | static unsigned long const masks[][2] = { | |
2360 | /* NOTE: all executable code must be the first section | |
2361 | * in this array; otherwise modify the text_size | |
2362 | * finder in the two loops below */ | |
2363 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2364 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2365 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2366 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2367 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2368 | }; | |
2369 | unsigned int m, i; | |
2370 | ||
49668688 RR |
2371 | for (i = 0; i < info->hdr->e_shnum; i++) |
2372 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2373 | |
5e124169 | 2374 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2375 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2376 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2377 | Elf_Shdr *s = &info->sechdrs[i]; | |
2378 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2379 | |
2380 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2381 | || (s->sh_flags & masks[m][1]) | |
2382 | || s->sh_entsize != ~0UL | |
49668688 | 2383 | || strstarts(sname, ".init")) |
1da177e4 | 2384 | continue; |
7523e4dc | 2385 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2386 | pr_debug("\t%s\n", sname); |
1da177e4 | 2387 | } |
84e1c6bb MC |
2388 | switch (m) { |
2389 | case 0: /* executable */ | |
7523e4dc RR |
2390 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2391 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2392 | break; |
2393 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2394 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2395 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2396 | break; |
444d13ff JY |
2397 | case 2: /* RO after init */ |
2398 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2399 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2400 | break; | |
2401 | case 4: /* whole core */ | |
7523e4dc | 2402 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2403 | break; |
2404 | } | |
1da177e4 LT |
2405 | } |
2406 | ||
5e124169 | 2407 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2408 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2409 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2410 | Elf_Shdr *s = &info->sechdrs[i]; | |
2411 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2412 | |
2413 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2414 | || (s->sh_flags & masks[m][1]) | |
2415 | || s->sh_entsize != ~0UL | |
49668688 | 2416 | || !strstarts(sname, ".init")) |
1da177e4 | 2417 | continue; |
7523e4dc | 2418 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2419 | | INIT_OFFSET_MASK); |
5e124169 | 2420 | pr_debug("\t%s\n", sname); |
1da177e4 | 2421 | } |
84e1c6bb MC |
2422 | switch (m) { |
2423 | case 0: /* executable */ | |
7523e4dc RR |
2424 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2425 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2426 | break; |
2427 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2428 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2429 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2430 | break; |
444d13ff JY |
2431 | case 2: |
2432 | /* | |
2433 | * RO after init doesn't apply to init_layout (only | |
2434 | * core_layout), so it just takes the value of ro_size. | |
2435 | */ | |
2436 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2437 | break; | |
2438 | case 4: /* whole init */ | |
7523e4dc | 2439 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2440 | break; |
2441 | } | |
1da177e4 LT |
2442 | } |
2443 | } | |
2444 | ||
1da177e4 LT |
2445 | static void set_license(struct module *mod, const char *license) |
2446 | { | |
2447 | if (!license) | |
2448 | license = "unspecified"; | |
2449 | ||
fa3ba2e8 | 2450 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2451 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2452 | pr_warn("%s: module license '%s' taints kernel.\n", |
2453 | mod->name, license); | |
373d4d09 RR |
2454 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2455 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2456 | } |
2457 | } | |
2458 | ||
2459 | /* Parse tag=value strings from .modinfo section */ | |
2460 | static char *next_string(char *string, unsigned long *secsize) | |
2461 | { | |
2462 | /* Skip non-zero chars */ | |
2463 | while (string[0]) { | |
2464 | string++; | |
2465 | if ((*secsize)-- <= 1) | |
2466 | return NULL; | |
2467 | } | |
2468 | ||
2469 | /* Skip any zero padding. */ | |
2470 | while (!string[0]) { | |
2471 | string++; | |
2472 | if ((*secsize)-- <= 1) | |
2473 | return NULL; | |
2474 | } | |
2475 | return string; | |
2476 | } | |
2477 | ||
49668688 | 2478 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2479 | { |
2480 | char *p; | |
2481 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2482 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2483 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2484 | |
5fdc7db6 JY |
2485 | /* |
2486 | * get_modinfo() calls made before rewrite_section_headers() | |
2487 | * must use sh_offset, as sh_addr isn't set! | |
2488 | */ | |
2489 | for (p = (char *)info->hdr + infosec->sh_offset; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2490 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2491 | return p + taglen + 1; | |
2492 | } | |
2493 | return NULL; | |
2494 | } | |
2495 | ||
49668688 | 2496 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2497 | { |
2498 | struct module_attribute *attr; | |
2499 | int i; | |
2500 | ||
2501 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2502 | if (attr->setup) | |
49668688 | 2503 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2504 | } |
2505 | } | |
c988d2b2 | 2506 | |
a263f776 RR |
2507 | static void free_modinfo(struct module *mod) |
2508 | { | |
2509 | struct module_attribute *attr; | |
2510 | int i; | |
2511 | ||
2512 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2513 | if (attr->free) | |
2514 | attr->free(mod); | |
2515 | } | |
2516 | } | |
2517 | ||
1da177e4 | 2518 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2519 | |
2d25bc55 JY |
2520 | /* Lookup exported symbol in given range of kernel_symbols */ |
2521 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2522 | const struct kernel_symbol *start, | |
2523 | const struct kernel_symbol *stop) | |
15bba37d | 2524 | { |
9d63487f AIB |
2525 | return bsearch(name, start, stop - start, |
2526 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2527 | } |
2528 | ||
ca4787b7 TA |
2529 | static int is_exported(const char *name, unsigned long value, |
2530 | const struct module *mod) | |
1da177e4 | 2531 | { |
ca4787b7 TA |
2532 | const struct kernel_symbol *ks; |
2533 | if (!mod) | |
2d25bc55 | 2534 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2535 | else |
2d25bc55 JY |
2536 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2537 | ||
7290d580 | 2538 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2539 | } |
2540 | ||
2541 | /* As per nm */ | |
eded41c1 | 2542 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2543 | { |
eded41c1 RR |
2544 | const Elf_Shdr *sechdrs = info->sechdrs; |
2545 | ||
1da177e4 LT |
2546 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2547 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2548 | return 'v'; | |
2549 | else | |
2550 | return 'w'; | |
2551 | } | |
2552 | if (sym->st_shndx == SHN_UNDEF) | |
2553 | return 'U'; | |
e0224418 | 2554 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2555 | return 'a'; |
2556 | if (sym->st_shndx >= SHN_LORESERVE) | |
2557 | return '?'; | |
2558 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2559 | return 't'; | |
2560 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2561 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2562 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2563 | return 'r'; | |
2564 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2565 | return 'g'; | |
2566 | else | |
2567 | return 'd'; | |
2568 | } | |
2569 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2570 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2571 | return 's'; | |
2572 | else | |
2573 | return 'b'; | |
2574 | } | |
eded41c1 RR |
2575 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2576 | ".debug")) { | |
1da177e4 | 2577 | return 'n'; |
eded41c1 | 2578 | } |
1da177e4 LT |
2579 | return '?'; |
2580 | } | |
2581 | ||
4a496226 | 2582 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2583 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2584 | { |
2585 | const Elf_Shdr *sec; | |
2586 | ||
2587 | if (src->st_shndx == SHN_UNDEF | |
2588 | || src->st_shndx >= shnum | |
2589 | || !src->st_name) | |
2590 | return false; | |
2591 | ||
e0224418 MB |
2592 | #ifdef CONFIG_KALLSYMS_ALL |
2593 | if (src->st_shndx == pcpundx) | |
2594 | return true; | |
2595 | #endif | |
2596 | ||
4a496226 JB |
2597 | sec = sechdrs + src->st_shndx; |
2598 | if (!(sec->sh_flags & SHF_ALLOC) | |
2599 | #ifndef CONFIG_KALLSYMS_ALL | |
2600 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2601 | #endif | |
2602 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2603 | return false; | |
2604 | ||
2605 | return true; | |
2606 | } | |
2607 | ||
48fd1188 KC |
2608 | /* |
2609 | * We only allocate and copy the strings needed by the parts of symtab | |
2610 | * we keep. This is simple, but has the effect of making multiple | |
2611 | * copies of duplicates. We could be more sophisticated, see | |
2612 | * linux-kernel thread starting with | |
2613 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2614 | */ | |
49668688 | 2615 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2616 | { |
49668688 RR |
2617 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2618 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2619 | const Elf_Sym *src; |
54523ec7 | 2620 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2621 | |
2622 | /* Put symbol section at end of init part of module. */ | |
2623 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2624 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2625 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2626 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2627 | |
49668688 | 2628 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2629 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2630 | |
48fd1188 | 2631 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2632 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2633 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2634 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2635 | info->index.pcpu)) { | |
59ef28b1 | 2636 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2637 | ndst++; |
554bdfe5 | 2638 | } |
59ef28b1 | 2639 | } |
4a496226 JB |
2640 | |
2641 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2642 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2643 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2644 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2645 | info->core_typeoffs = mod->core_layout.size; |
2646 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2647 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2648 | |
554bdfe5 JB |
2649 | /* Put string table section at end of init part of module. */ |
2650 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2651 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2652 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2653 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2654 | |
2655 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2656 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2657 | __alignof__(struct mod_kallsyms)); | |
2658 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2659 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2660 | info->init_typeoffs = mod->init_layout.size; |
2661 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2662 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2663 | } |
2664 | ||
8244062e RR |
2665 | /* |
2666 | * We use the full symtab and strtab which layout_symtab arranged to | |
2667 | * be appended to the init section. Later we switch to the cut-down | |
2668 | * core-only ones. | |
2669 | */ | |
811d66a0 | 2670 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2671 | { |
4a496226 JB |
2672 | unsigned int i, ndst; |
2673 | const Elf_Sym *src; | |
2674 | Elf_Sym *dst; | |
554bdfe5 | 2675 | char *s; |
eded41c1 | 2676 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2677 | |
8244062e RR |
2678 | /* Set up to point into init section. */ |
2679 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2680 | ||
2681 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2682 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2683 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2684 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2685 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2686 | |
1c7651f4 EL |
2687 | /* |
2688 | * Now populate the cut down core kallsyms for after init | |
2689 | * and set types up while we still have access to sections. | |
2690 | */ | |
8244062e RR |
2691 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2692 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2693 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2694 | src = mod->kallsyms->symtab; |
2695 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2696 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2697 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2698 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2699 | info->index.pcpu)) { | |
1c7651f4 EL |
2700 | mod->core_kallsyms.typetab[ndst] = |
2701 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2702 | dst[ndst] = src[i]; |
8244062e RR |
2703 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2704 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2705 | KSYM_NAME_LEN) + 1; |
2706 | } | |
4a496226 | 2707 | } |
8244062e | 2708 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2709 | } |
2710 | #else | |
49668688 | 2711 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2712 | { |
2713 | } | |
3ae91c21 | 2714 | |
abbce906 | 2715 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2716 | { |
2717 | } | |
2718 | #endif /* CONFIG_KALLSYMS */ | |
2719 | ||
52796312 | 2720 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2721 | { |
811d66a0 RR |
2722 | if (!debug) |
2723 | return; | |
513770f5 | 2724 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2725 | } |
346e15be | 2726 | |
52796312 | 2727 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2728 | { |
2729 | if (debug) | |
52796312 | 2730 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2731 | } |
2732 | ||
74e08fcf JB |
2733 | void * __weak module_alloc(unsigned long size) |
2734 | { | |
82fab442 | 2735 | return vmalloc_exec(size); |
74e08fcf JB |
2736 | } |
2737 | ||
4f2294b6 | 2738 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2739 | static void kmemleak_load_module(const struct module *mod, |
2740 | const struct load_info *info) | |
4f2294b6 CM |
2741 | { |
2742 | unsigned int i; | |
2743 | ||
2744 | /* only scan the sections containing data */ | |
c017b4be | 2745 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2746 | |
49668688 | 2747 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2748 | /* Scan all writable sections that's not executable */ |
2749 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2750 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2751 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2752 | continue; |
2753 | ||
49668688 RR |
2754 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2755 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2756 | } |
2757 | } | |
2758 | #else | |
49668688 RR |
2759 | static inline void kmemleak_load_module(const struct module *mod, |
2760 | const struct load_info *info) | |
4f2294b6 CM |
2761 | { |
2762 | } | |
2763 | #endif | |
2764 | ||
106a4ee2 | 2765 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2766 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2767 | { |
2768 | int err = -ENOKEY; | |
34e1169d KC |
2769 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2770 | const void *mod = info->hdr; | |
caabe240 | 2771 | |
bca014ca BH |
2772 | /* |
2773 | * Require flags == 0, as a module with version information | |
2774 | * removed is no longer the module that was signed | |
2775 | */ | |
2776 | if (flags == 0 && | |
2777 | info->len > markerlen && | |
34e1169d | 2778 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2779 | /* We truncate the module to discard the signature */ |
34e1169d | 2780 | info->len -= markerlen; |
f314dfea | 2781 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2782 | } |
2783 | ||
2784 | if (!err) { | |
2785 | info->sig_ok = true; | |
2786 | return 0; | |
2787 | } | |
2788 | ||
2789 | /* Not having a signature is only an error if we're strict. */ | |
2c8fd268 | 2790 | if (err == -ENOKEY && !is_module_sig_enforced()) |
106a4ee2 RR |
2791 | err = 0; |
2792 | ||
2793 | return err; | |
2794 | } | |
2795 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2796 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2797 | { |
2798 | return 0; | |
2799 | } | |
2800 | #endif /* !CONFIG_MODULE_SIG */ | |
2801 | ||
34e1169d KC |
2802 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2803 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2804 | { |
34e1169d KC |
2805 | if (info->len < sizeof(*(info->hdr))) |
2806 | return -ENOEXEC; | |
2807 | ||
2808 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2809 | || info->hdr->e_type != ET_REL | |
2810 | || !elf_check_arch(info->hdr) | |
2811 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2812 | return -ENOEXEC; | |
2813 | ||
2814 | if (info->hdr->e_shoff >= info->len | |
2815 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2816 | info->len - info->hdr->e_shoff)) | |
2817 | return -ENOEXEC; | |
40dd2560 | 2818 | |
34e1169d KC |
2819 | return 0; |
2820 | } | |
2821 | ||
3afe9f84 LT |
2822 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2823 | ||
2824 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2825 | { | |
2826 | do { | |
2827 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2828 | ||
2829 | if (copy_from_user(dst, usrc, n) != 0) | |
2830 | return -EFAULT; | |
2831 | cond_resched(); | |
2832 | dst += n; | |
2833 | usrc += n; | |
2834 | len -= n; | |
2835 | } while (len); | |
2836 | return 0; | |
2837 | } | |
2838 | ||
1ce15ef4 | 2839 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2840 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2841 | { |
2992ef29 JP |
2842 | if (get_modinfo(info, "livepatch")) { |
2843 | mod->klp = true; | |
2844 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2845 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2846 | mod->name); | |
2992ef29 | 2847 | } |
1ce15ef4 JY |
2848 | |
2849 | return 0; | |
2850 | } | |
2851 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2852 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2853 | { |
2854 | if (get_modinfo(info, "livepatch")) { | |
2855 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2856 | mod->name); | |
2857 | return -ENOEXEC; | |
2858 | } | |
2859 | ||
2860 | return 0; | |
2861 | } | |
2862 | #endif /* CONFIG_LIVEPATCH */ | |
2863 | ||
caf7501a AK |
2864 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2865 | { | |
2866 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2867 | return; | |
2868 | ||
2869 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2870 | mod->name); | |
2871 | } | |
2872 | ||
34e1169d KC |
2873 | /* Sets info->hdr and info->len. */ |
2874 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2875 | struct load_info *info) | |
40dd2560 RR |
2876 | { |
2877 | int err; | |
40dd2560 | 2878 | |
34e1169d KC |
2879 | info->len = len; |
2880 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2881 | return -ENOEXEC; |
2882 | ||
c77b8cdf | 2883 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2884 | if (err) |
2885 | return err; | |
2886 | ||
40dd2560 | 2887 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2888 | info->hdr = __vmalloc(info->len, |
19809c2d | 2889 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2890 | if (!info->hdr) |
40dd2560 RR |
2891 | return -ENOMEM; |
2892 | ||
3afe9f84 | 2893 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2894 | vfree(info->hdr); |
2895 | return -EFAULT; | |
40dd2560 RR |
2896 | } |
2897 | ||
34e1169d KC |
2898 | return 0; |
2899 | } | |
2900 | ||
d913188c RR |
2901 | static void free_copy(struct load_info *info) |
2902 | { | |
d913188c RR |
2903 | vfree(info->hdr); |
2904 | } | |
2905 | ||
2f3238ae | 2906 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2907 | { |
2908 | unsigned int i; | |
2909 | ||
2910 | /* This should always be true, but let's be sure. */ | |
2911 | info->sechdrs[0].sh_addr = 0; | |
2912 | ||
2913 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2914 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2915 | if (shdr->sh_type != SHT_NOBITS | |
2916 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2917 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2918 | return -ENOEXEC; |
2919 | } | |
2920 | ||
2921 | /* Mark all sections sh_addr with their address in the | |
2922 | temporary image. */ | |
2923 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2924 | ||
2925 | #ifndef CONFIG_MODULE_UNLOAD | |
2926 | /* Don't load .exit sections */ | |
2927 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2928 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2929 | #endif | |
8b5f61a7 | 2930 | } |
d6df72a0 RR |
2931 | |
2932 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 2933 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 2934 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 2935 | |
8b5f61a7 RR |
2936 | return 0; |
2937 | } | |
2938 | ||
3264d3f9 LT |
2939 | /* |
2940 | * Set up our basic convenience variables (pointers to section headers, | |
2941 | * search for module section index etc), and do some basic section | |
2942 | * verification. | |
2943 | * | |
81a0abd9 JY |
2944 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
2945 | * will be allocated in move_module(). | |
3264d3f9 | 2946 | */ |
81a0abd9 | 2947 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2948 | { |
2949 | unsigned int i; | |
3264d3f9 LT |
2950 | |
2951 | /* Set up the convenience variables */ | |
2952 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2953 | info->secstrings = (void *)info->hdr |
2954 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2955 | |
5fdc7db6 JY |
2956 | /* Try to find a name early so we can log errors with a module name */ |
2957 | info->index.info = find_sec(info, ".modinfo"); | |
2958 | if (!info->index.info) | |
2959 | info->name = "(missing .modinfo section)"; | |
2960 | else | |
2961 | info->name = get_modinfo(info, "name"); | |
3264d3f9 | 2962 | |
8b5f61a7 RR |
2963 | /* Find internal symbols and strings. */ |
2964 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2965 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2966 | info->index.sym = i; | |
2967 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2968 | info->strtab = (char *)info->hdr |
2969 | + info->sechdrs[info->index.str].sh_offset; | |
2970 | break; | |
3264d3f9 | 2971 | } |
3264d3f9 LT |
2972 | } |
2973 | ||
5fdc7db6 JY |
2974 | if (info->index.sym == 0) { |
2975 | pr_warn("%s: module has no symbols (stripped?)\n", info->name); | |
2976 | return -ENOEXEC; | |
2977 | } | |
2978 | ||
49668688 | 2979 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2980 | if (!info->index.mod) { |
3e2e857f KC |
2981 | pr_warn("%s: No module found in object\n", |
2982 | info->name ?: "(missing .modinfo name field)"); | |
81a0abd9 | 2983 | return -ENOEXEC; |
3264d3f9 LT |
2984 | } |
2985 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 2986 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 2987 | |
3e2e857f | 2988 | /* |
5fdc7db6 | 2989 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
2990 | * on-disk struct mod 'name' field. |
2991 | */ | |
2992 | if (!info->name) | |
81a0abd9 | 2993 | info->name = info->mod->name; |
3e2e857f | 2994 | |
5fdc7db6 JY |
2995 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2996 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2997 | else | |
2998 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 2999 | |
49668688 | 3000 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3001 | |
81a0abd9 | 3002 | return 0; |
3264d3f9 LT |
3003 | } |
3004 | ||
2f3238ae | 3005 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3006 | { |
49668688 | 3007 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3008 | int err; |
3009 | ||
2f3238ae RR |
3010 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3011 | modmagic = NULL; | |
3012 | ||
40dd2560 RR |
3013 | /* This is allowed: modprobe --force will invalidate it. */ |
3014 | if (!modmagic) { | |
3015 | err = try_to_force_load(mod, "bad vermagic"); | |
3016 | if (err) | |
3017 | return err; | |
49668688 | 3018 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3019 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3020 | info->name, modmagic, vermagic); |
40dd2560 RR |
3021 | return -ENOEXEC; |
3022 | } | |
3023 | ||
3205c36c LP |
3024 | if (!get_modinfo(info, "intree")) { |
3025 | if (!test_taint(TAINT_OOT_MODULE)) | |
3026 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3027 | mod->name); | |
373d4d09 | 3028 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3029 | } |
2449b8ba | 3030 | |
caf7501a AK |
3031 | check_modinfo_retpoline(mod, info); |
3032 | ||
49668688 | 3033 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3034 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3035 | pr_warn("%s: module is from the staging directory, the quality " |
3036 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3037 | } |
22e268eb | 3038 | |
2992ef29 | 3039 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3040 | if (err) |
3041 | return err; | |
3042 | ||
22e268eb | 3043 | /* Set up license info based on the info section */ |
49668688 | 3044 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3045 | |
40dd2560 RR |
3046 | return 0; |
3047 | } | |
3048 | ||
eb3057df | 3049 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3050 | { |
49668688 | 3051 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3052 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3053 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3054 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3055 | mod->crcs = section_addr(info, "__kcrctab"); |
3056 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3057 | sizeof(*mod->gpl_syms), |
3058 | &mod->num_gpl_syms); | |
49668688 RR |
3059 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3060 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3061 | "__ksymtab_gpl_future", |
3062 | sizeof(*mod->gpl_future_syms), | |
3063 | &mod->num_gpl_future_syms); | |
49668688 | 3064 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3065 | |
3066 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3067 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3068 | sizeof(*mod->unused_syms), |
3069 | &mod->num_unused_syms); | |
49668688 RR |
3070 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3071 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3072 | sizeof(*mod->unused_gpl_syms), |
3073 | &mod->num_unused_gpl_syms); | |
49668688 | 3074 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3075 | #endif |
3076 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3077 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3078 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3079 | if (!mod->ctors) |
3080 | mod->ctors = section_objs(info, ".init_array", | |
3081 | sizeof(*mod->ctors), &mod->num_ctors); | |
3082 | else if (find_sec(info, ".init_array")) { | |
3083 | /* | |
3084 | * This shouldn't happen with same compiler and binutils | |
3085 | * building all parts of the module. | |
3086 | */ | |
6da0b565 | 3087 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3088 | mod->name); |
3089 | return -EINVAL; | |
3090 | } | |
f91a13bb LT |
3091 | #endif |
3092 | ||
3093 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3094 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3095 | sizeof(*mod->tracepoints_ptrs), | |
3096 | &mod->num_tracepoints); | |
f91a13bb | 3097 | #endif |
a38d1107 MM |
3098 | #ifdef CONFIG_BPF_EVENTS |
3099 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3100 | sizeof(*mod->bpf_raw_events), | |
3101 | &mod->num_bpf_raw_events); | |
3102 | #endif | |
e9666d10 | 3103 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3104 | mod->jump_entries = section_objs(info, "__jump_table", |
3105 | sizeof(*mod->jump_entries), | |
3106 | &mod->num_jump_entries); | |
3107 | #endif | |
f91a13bb | 3108 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3109 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3110 | sizeof(*mod->trace_events), |
3111 | &mod->num_trace_events); | |
99be647c JL |
3112 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3113 | sizeof(*mod->trace_evals), | |
3114 | &mod->num_trace_evals); | |
f91a13bb | 3115 | #endif |
13b9b6e7 SR |
3116 | #ifdef CONFIG_TRACING |
3117 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3118 | sizeof(*mod->trace_bprintk_fmt_start), | |
3119 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3120 | #endif |
f91a13bb LT |
3121 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3122 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3123 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3124 | sizeof(*mod->ftrace_callsites), |
3125 | &mod->num_ftrace_callsites); | |
3126 | #endif | |
540adea3 MH |
3127 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3128 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3129 | sizeof(*mod->ei_funcs), | |
3130 | &mod->num_ei_funcs); | |
92ace999 | 3131 | #endif |
811d66a0 RR |
3132 | mod->extable = section_objs(info, "__ex_table", |
3133 | sizeof(*mod->extable), &mod->num_exentries); | |
3134 | ||
49668688 | 3135 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3136 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3137 | |
3138 | info->debug = section_objs(info, "__verbose", | |
3139 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3140 | |
3141 | return 0; | |
f91a13bb LT |
3142 | } |
3143 | ||
49668688 | 3144 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3145 | { |
3146 | int i; | |
3147 | void *ptr; | |
3148 | ||
3149 | /* Do the allocs. */ | |
7523e4dc | 3150 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3151 | /* |
3152 | * The pointer to this block is stored in the module structure | |
3153 | * which is inside the block. Just mark it as not being a | |
3154 | * leak. | |
3155 | */ | |
3156 | kmemleak_not_leak(ptr); | |
3157 | if (!ptr) | |
d913188c | 3158 | return -ENOMEM; |
65b8a9b4 | 3159 | |
7523e4dc RR |
3160 | memset(ptr, 0, mod->core_layout.size); |
3161 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3162 | |
7523e4dc RR |
3163 | if (mod->init_layout.size) { |
3164 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3165 | /* |
3166 | * The pointer to this block is stored in the module structure | |
3167 | * which is inside the block. This block doesn't need to be | |
3168 | * scanned as it contains data and code that will be freed | |
3169 | * after the module is initialized. | |
3170 | */ | |
3171 | kmemleak_ignore(ptr); | |
3172 | if (!ptr) { | |
7523e4dc | 3173 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3174 | return -ENOMEM; |
3175 | } | |
7523e4dc RR |
3176 | memset(ptr, 0, mod->init_layout.size); |
3177 | mod->init_layout.base = ptr; | |
82fab442 | 3178 | } else |
7523e4dc | 3179 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3180 | |
3181 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3182 | pr_debug("final section addresses:\n"); |
49668688 | 3183 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3184 | void *dest; |
49668688 | 3185 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3186 | |
49668688 | 3187 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3188 | continue; |
3189 | ||
49668688 | 3190 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3191 | dest = mod->init_layout.base |
49668688 | 3192 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3193 | else |
7523e4dc | 3194 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3195 | |
49668688 RR |
3196 | if (shdr->sh_type != SHT_NOBITS) |
3197 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3198 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3199 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3200 | pr_debug("\t0x%lx %s\n", |
3201 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3202 | } |
d913188c RR |
3203 | |
3204 | return 0; | |
65b8a9b4 LT |
3205 | } |
3206 | ||
49668688 | 3207 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3208 | { |
3205c36c LP |
3209 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3210 | ||
22e268eb RR |
3211 | /* |
3212 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3213 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3214 | * using GPL-only symbols it needs. | |
3215 | */ | |
3216 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3217 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3218 | |
3219 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3220 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3221 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3222 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3223 | |
c99af375 MG |
3224 | /* lve claims to be GPL but upstream won't provide source */ |
3225 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3226 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3227 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3228 | |
3205c36c LP |
3229 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3230 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3231 | ||
22e268eb RR |
3232 | #ifdef CONFIG_MODVERSIONS |
3233 | if ((mod->num_syms && !mod->crcs) | |
3234 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3235 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3236 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3237 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3238 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3239 | #endif | |
3240 | ) { | |
3241 | return try_to_force_load(mod, | |
3242 | "no versions for exported symbols"); | |
3243 | } | |
3244 | #endif | |
3245 | return 0; | |
3246 | } | |
3247 | ||
3248 | static void flush_module_icache(const struct module *mod) | |
3249 | { | |
3250 | mm_segment_t old_fs; | |
3251 | ||
3252 | /* flush the icache in correct context */ | |
3253 | old_fs = get_fs(); | |
3254 | set_fs(KERNEL_DS); | |
3255 | ||
3256 | /* | |
3257 | * Flush the instruction cache, since we've played with text. | |
3258 | * Do it before processing of module parameters, so the module | |
3259 | * can provide parameter accessor functions of its own. | |
3260 | */ | |
7523e4dc RR |
3261 | if (mod->init_layout.base) |
3262 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3263 | (unsigned long)mod->init_layout.base | |
3264 | + mod->init_layout.size); | |
3265 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3266 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3267 | |
3268 | set_fs(old_fs); | |
3269 | } | |
3270 | ||
74e08fcf JB |
3271 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3272 | Elf_Shdr *sechdrs, | |
3273 | char *secstrings, | |
3274 | struct module *mod) | |
3275 | { | |
3276 | return 0; | |
3277 | } | |
3278 | ||
be7de5f9 PB |
3279 | /* module_blacklist is a comma-separated list of module names */ |
3280 | static char *module_blacklist; | |
96b5b194 | 3281 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3282 | { |
3283 | const char *p; | |
3284 | size_t len; | |
3285 | ||
3286 | if (!module_blacklist) | |
3287 | return false; | |
3288 | ||
3289 | for (p = module_blacklist; *p; p += len) { | |
3290 | len = strcspn(p, ","); | |
3291 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3292 | return true; | |
3293 | if (p[len] == ',') | |
3294 | len++; | |
3295 | } | |
3296 | return false; | |
3297 | } | |
3298 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3299 | ||
2f3238ae | 3300 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3301 | { |
1da177e4 | 3302 | struct module *mod; |
444d13ff | 3303 | unsigned int ndx; |
d913188c | 3304 | int err; |
3ae91c21 | 3305 | |
81a0abd9 | 3306 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3307 | if (err) |
3308 | return ERR_PTR(err); | |
1da177e4 | 3309 | |
1da177e4 | 3310 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3311 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3312 | info->secstrings, info->mod); |
1da177e4 | 3313 | if (err < 0) |
8d8022e8 | 3314 | return ERR_PTR(err); |
1da177e4 | 3315 | |
8d8022e8 RR |
3316 | /* We will do a special allocation for per-cpu sections later. */ |
3317 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3318 | |
444d13ff JY |
3319 | /* |
3320 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3321 | * layout_sections() can put it in the right place. | |
3322 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3323 | */ | |
3324 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3325 | if (ndx) |
3326 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3327 | /* | |
3328 | * Mark the __jump_table section as ro_after_init as well: these data | |
3329 | * structures are never modified, with the exception of entries that | |
3330 | * refer to code in the __init section, which are annotated as such | |
3331 | * at module load time. | |
3332 | */ | |
3333 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3334 | if (ndx) |
3335 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3336 | ||
1da177e4 LT |
3337 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3338 | this is done generically; there doesn't appear to be any | |
3339 | special cases for the architectures. */ | |
81a0abd9 JY |
3340 | layout_sections(info->mod, info); |
3341 | layout_symtab(info->mod, info); | |
1da177e4 | 3342 | |
65b8a9b4 | 3343 | /* Allocate and move to the final place */ |
81a0abd9 | 3344 | err = move_module(info->mod, info); |
d913188c | 3345 | if (err) |
8d8022e8 | 3346 | return ERR_PTR(err); |
d913188c RR |
3347 | |
3348 | /* Module has been copied to its final place now: return it. */ | |
3349 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3350 | kmemleak_load_module(mod, info); |
d913188c | 3351 | return mod; |
d913188c RR |
3352 | } |
3353 | ||
3354 | /* mod is no longer valid after this! */ | |
3355 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3356 | { | |
d913188c | 3357 | percpu_modfree(mod); |
d453cded | 3358 | module_arch_freeing_init(mod); |
7523e4dc RR |
3359 | module_memfree(mod->init_layout.base); |
3360 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3361 | } |
3362 | ||
74e08fcf JB |
3363 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3364 | const Elf_Shdr *sechdrs, | |
3365 | struct module *me) | |
3366 | { | |
3367 | return 0; | |
3368 | } | |
3369 | ||
811d66a0 RR |
3370 | static int post_relocation(struct module *mod, const struct load_info *info) |
3371 | { | |
51f3d0f4 | 3372 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3373 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3374 | ||
3375 | /* Copy relocated percpu area over. */ | |
3376 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3377 | info->sechdrs[info->index.pcpu].sh_size); | |
3378 | ||
51f3d0f4 | 3379 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3380 | add_kallsyms(mod, info); |
3381 | ||
3382 | /* Arch-specific module finalizing. */ | |
3383 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3384 | } | |
3385 | ||
9bb9c3be RR |
3386 | /* Is this module of this name done loading? No locks held. */ |
3387 | static bool finished_loading(const char *name) | |
3388 | { | |
3389 | struct module *mod; | |
3390 | bool ret; | |
3391 | ||
9cc019b8 PZ |
3392 | /* |
3393 | * The module_mutex should not be a heavily contended lock; | |
3394 | * if we get the occasional sleep here, we'll go an extra iteration | |
3395 | * in the wait_event_interruptible(), which is harmless. | |
3396 | */ | |
3397 | sched_annotate_sleep(); | |
9bb9c3be | 3398 | mutex_lock(&module_mutex); |
4f6de4d5 | 3399 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3400 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3401 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3402 | mutex_unlock(&module_mutex); |
3403 | ||
3404 | return ret; | |
3405 | } | |
3406 | ||
34e1169d KC |
3407 | /* Call module constructors. */ |
3408 | static void do_mod_ctors(struct module *mod) | |
3409 | { | |
3410 | #ifdef CONFIG_CONSTRUCTORS | |
3411 | unsigned long i; | |
3412 | ||
3413 | for (i = 0; i < mod->num_ctors; i++) | |
3414 | mod->ctors[i](); | |
3415 | #endif | |
3416 | } | |
3417 | ||
c7496379 RR |
3418 | /* For freeing module_init on success, in case kallsyms traversing */ |
3419 | struct mod_initfree { | |
1a7b7d92 | 3420 | struct llist_node node; |
c7496379 RR |
3421 | void *module_init; |
3422 | }; | |
3423 | ||
1a7b7d92 | 3424 | static void do_free_init(struct work_struct *w) |
c7496379 | 3425 | { |
1a7b7d92 RE |
3426 | struct llist_node *pos, *n, *list; |
3427 | struct mod_initfree *initfree; | |
3428 | ||
3429 | list = llist_del_all(&init_free_list); | |
3430 | ||
3431 | synchronize_rcu(); | |
3432 | ||
3433 | llist_for_each_safe(pos, n, list) { | |
3434 | initfree = container_of(pos, struct mod_initfree, node); | |
3435 | module_memfree(initfree->module_init); | |
3436 | kfree(initfree); | |
3437 | } | |
c7496379 RR |
3438 | } |
3439 | ||
1a7b7d92 RE |
3440 | static int __init modules_wq_init(void) |
3441 | { | |
3442 | INIT_WORK(&init_free_wq, do_free_init); | |
3443 | init_llist_head(&init_free_list); | |
3444 | return 0; | |
3445 | } | |
3446 | module_init(modules_wq_init); | |
3447 | ||
be02a186 JK |
3448 | /* |
3449 | * This is where the real work happens. | |
3450 | * | |
3451 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3452 | * helper command 'lx-symbols'. | |
3453 | */ | |
3454 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3455 | { |
3456 | int ret = 0; | |
c7496379 RR |
3457 | struct mod_initfree *freeinit; |
3458 | ||
3459 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3460 | if (!freeinit) { | |
3461 | ret = -ENOMEM; | |
3462 | goto fail; | |
3463 | } | |
7523e4dc | 3464 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3465 | |
774a1221 TH |
3466 | /* |
3467 | * We want to find out whether @mod uses async during init. Clear | |
3468 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3469 | */ | |
3470 | current->flags &= ~PF_USED_ASYNC; | |
3471 | ||
34e1169d KC |
3472 | do_mod_ctors(mod); |
3473 | /* Start the module */ | |
3474 | if (mod->init != NULL) | |
3475 | ret = do_one_initcall(mod->init); | |
3476 | if (ret < 0) { | |
c7496379 | 3477 | goto fail_free_freeinit; |
34e1169d KC |
3478 | } |
3479 | if (ret > 0) { | |
bddb12b3 AM |
3480 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3481 | "follow 0/-E convention\n" | |
3482 | "%s: loading module anyway...\n", | |
3483 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3484 | dump_stack(); |
3485 | } | |
3486 | ||
3487 | /* Now it's a first class citizen! */ | |
3488 | mod->state = MODULE_STATE_LIVE; | |
3489 | blocking_notifier_call_chain(&module_notify_list, | |
3490 | MODULE_STATE_LIVE, mod); | |
3491 | ||
774a1221 TH |
3492 | /* |
3493 | * We need to finish all async code before the module init sequence | |
3494 | * is done. This has potential to deadlock. For example, a newly | |
3495 | * detected block device can trigger request_module() of the | |
3496 | * default iosched from async probing task. Once userland helper | |
3497 | * reaches here, async_synchronize_full() will wait on the async | |
3498 | * task waiting on request_module() and deadlock. | |
3499 | * | |
3500 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3501 | * iff module init queued any async jobs. This isn't a full | |
3502 | * solution as it will deadlock the same if module loading from | |
3503 | * async jobs nests more than once; however, due to the various | |
3504 | * constraints, this hack seems to be the best option for now. | |
3505 | * Please refer to the following thread for details. | |
3506 | * | |
3507 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3508 | */ | |
f2411da7 | 3509 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3510 | async_synchronize_full(); |
34e1169d | 3511 | |
aba4b5c2 | 3512 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3513 | mod->init_layout.size); |
34e1169d KC |
3514 | mutex_lock(&module_mutex); |
3515 | /* Drop initial reference. */ | |
3516 | module_put(mod); | |
3517 | trim_init_extable(mod); | |
3518 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3519 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3520 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3521 | #endif |
444d13ff | 3522 | module_enable_ro(mod, true); |
93c2e105 | 3523 | mod_tree_remove_init(mod); |
d453cded | 3524 | module_arch_freeing_init(mod); |
7523e4dc RR |
3525 | mod->init_layout.base = NULL; |
3526 | mod->init_layout.size = 0; | |
3527 | mod->init_layout.ro_size = 0; | |
444d13ff | 3528 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3529 | mod->init_layout.text_size = 0; |
c7496379 RR |
3530 | /* |
3531 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3532 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3533 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3534 | * path. module_memfree() cannot be called in an interrupt, so do the |
3535 | * work and call synchronize_rcu() in a work queue. | |
3536 | * | |
ae646f0b JH |
3537 | * Note that module_alloc() on most architectures creates W+X page |
3538 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3539 | * code such as mark_rodata_ro() which depends on those mappings to | |
3540 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3541 | * rcu_barrier() |
c7496379 | 3542 | */ |
1a7b7d92 RE |
3543 | if (llist_add(&freeinit->node, &init_free_list)) |
3544 | schedule_work(&init_free_wq); | |
3545 | ||
34e1169d KC |
3546 | mutex_unlock(&module_mutex); |
3547 | wake_up_all(&module_wq); | |
3548 | ||
3549 | return 0; | |
c7496379 RR |
3550 | |
3551 | fail_free_freeinit: | |
3552 | kfree(freeinit); | |
3553 | fail: | |
3554 | /* Try to protect us from buggy refcounters. */ | |
3555 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3556 | synchronize_rcu(); |
c7496379 RR |
3557 | module_put(mod); |
3558 | blocking_notifier_call_chain(&module_notify_list, | |
3559 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3560 | klp_module_going(mod); |
7dcd182b | 3561 | ftrace_release_mod(mod); |
c7496379 RR |
3562 | free_module(mod); |
3563 | wake_up_all(&module_wq); | |
3564 | return ret; | |
34e1169d KC |
3565 | } |
3566 | ||
3567 | static int may_init_module(void) | |
3568 | { | |
3569 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3570 | return -EPERM; | |
3571 | ||
3572 | return 0; | |
3573 | } | |
3574 | ||
a3535c7e RR |
3575 | /* |
3576 | * We try to place it in the list now to make sure it's unique before | |
3577 | * we dedicate too many resources. In particular, temporary percpu | |
3578 | * memory exhaustion. | |
3579 | */ | |
3580 | static int add_unformed_module(struct module *mod) | |
3581 | { | |
3582 | int err; | |
3583 | struct module *old; | |
3584 | ||
3585 | mod->state = MODULE_STATE_UNFORMED; | |
3586 | ||
3587 | again: | |
3588 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3589 | old = find_module_all(mod->name, strlen(mod->name), true); |
3590 | if (old != NULL) { | |
a3535c7e RR |
3591 | if (old->state == MODULE_STATE_COMING |
3592 | || old->state == MODULE_STATE_UNFORMED) { | |
3593 | /* Wait in case it fails to load. */ | |
3594 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3595 | err = wait_event_interruptible(module_wq, |
3596 | finished_loading(mod->name)); | |
a3535c7e RR |
3597 | if (err) |
3598 | goto out_unlocked; | |
3599 | goto again; | |
3600 | } | |
3601 | err = -EEXIST; | |
3602 | goto out; | |
3603 | } | |
4f666546 | 3604 | mod_update_bounds(mod); |
a3535c7e | 3605 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3606 | mod_tree_insert(mod); |
a3535c7e RR |
3607 | err = 0; |
3608 | ||
3609 | out: | |
3610 | mutex_unlock(&module_mutex); | |
3611 | out_unlocked: | |
3612 | return err; | |
3613 | } | |
3614 | ||
3615 | static int complete_formation(struct module *mod, struct load_info *info) | |
3616 | { | |
3617 | int err; | |
3618 | ||
3619 | mutex_lock(&module_mutex); | |
3620 | ||
3621 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3622 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3623 | if (err < 0) |
3624 | goto out; | |
3625 | ||
3626 | /* This relies on module_mutex for list integrity. */ | |
3627 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3628 | ||
444d13ff | 3629 | module_enable_ro(mod, false); |
85c898db | 3630 | module_enable_nx(mod); |
4982223e | 3631 | |
a3535c7e RR |
3632 | /* Mark state as coming so strong_try_module_get() ignores us, |
3633 | * but kallsyms etc. can see us. */ | |
3634 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3635 | mutex_unlock(&module_mutex); |
3636 | ||
4982223e | 3637 | return 0; |
a3535c7e RR |
3638 | |
3639 | out: | |
3640 | mutex_unlock(&module_mutex); | |
3641 | return err; | |
3642 | } | |
3643 | ||
4c973d16 JY |
3644 | static int prepare_coming_module(struct module *mod) |
3645 | { | |
7e545d6e JY |
3646 | int err; |
3647 | ||
4c973d16 | 3648 | ftrace_module_enable(mod); |
7e545d6e JY |
3649 | err = klp_module_coming(mod); |
3650 | if (err) | |
3651 | return err; | |
3652 | ||
4c973d16 JY |
3653 | blocking_notifier_call_chain(&module_notify_list, |
3654 | MODULE_STATE_COMING, mod); | |
3655 | return 0; | |
3656 | } | |
3657 | ||
ecc86170 LR |
3658 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3659 | void *arg) | |
54041d8a | 3660 | { |
f2411da7 LR |
3661 | struct module *mod = arg; |
3662 | int ret; | |
3663 | ||
3664 | if (strcmp(param, "async_probe") == 0) { | |
3665 | mod->async_probe_requested = true; | |
3666 | return 0; | |
3667 | } | |
3668 | ||
6da0b565 | 3669 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3670 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3671 | if (ret != 0) |
3672 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3673 | return 0; |
3674 | } | |
3675 | ||
d913188c RR |
3676 | /* Allocate and load the module: note that size of section 0 is always |
3677 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3678 | static int load_module(struct load_info *info, const char __user *uargs, |
3679 | int flags) | |
d913188c | 3680 | { |
a3535c7e | 3681 | struct module *mod; |
5fdc7db6 | 3682 | long err = 0; |
51e158c1 | 3683 | char *after_dashes; |
d913188c | 3684 | |
5fdc7db6 JY |
3685 | err = elf_header_check(info); |
3686 | if (err) | |
3687 | goto free_copy; | |
3688 | ||
3689 | err = setup_load_info(info, flags); | |
3690 | if (err) | |
3691 | goto free_copy; | |
3692 | ||
3693 | if (blacklisted(info->name)) { | |
3694 | err = -EPERM; | |
3695 | goto free_copy; | |
3696 | } | |
3697 | ||
bca014ca | 3698 | err = module_sig_check(info, flags); |
34e1169d KC |
3699 | if (err) |
3700 | goto free_copy; | |
d913188c | 3701 | |
5fdc7db6 | 3702 | err = rewrite_section_headers(info, flags); |
d913188c | 3703 | if (err) |
34e1169d | 3704 | goto free_copy; |
d913188c | 3705 | |
5fdc7db6 JY |
3706 | /* Check module struct version now, before we try to use module. */ |
3707 | if (!check_modstruct_version(info, info->mod)) { | |
3708 | err = -ENOEXEC; | |
3709 | goto free_copy; | |
3710 | } | |
3711 | ||
d913188c | 3712 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3713 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3714 | if (IS_ERR(mod)) { |
3715 | err = PTR_ERR(mod); | |
d913188c | 3716 | goto free_copy; |
1da177e4 | 3717 | } |
1da177e4 | 3718 | |
ca86cad7 RGB |
3719 | audit_log_kern_module(mod->name); |
3720 | ||
a3535c7e RR |
3721 | /* Reserve our place in the list. */ |
3722 | err = add_unformed_module(mod); | |
3723 | if (err) | |
1fb9341a | 3724 | goto free_module; |
1fb9341a | 3725 | |
106a4ee2 | 3726 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3727 | mod->sig_ok = info->sig_ok; |
64748a2c | 3728 | if (!mod->sig_ok) { |
bddb12b3 | 3729 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3730 | "and/or required key missing - tainting " |
bddb12b3 | 3731 | "kernel\n", mod->name); |
66cc69e3 | 3732 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3733 | } |
106a4ee2 RR |
3734 | #endif |
3735 | ||
8d8022e8 | 3736 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3737 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3738 | if (err) |
3739 | goto unlink_mod; | |
3740 | ||
49668688 | 3741 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3742 | err = module_unload_init(mod); |
3743 | if (err) | |
1fb9341a | 3744 | goto unlink_mod; |
1da177e4 | 3745 | |
cf2fde7b | 3746 | init_param_lock(mod); |
b51d23e4 | 3747 | |
22e268eb RR |
3748 | /* Now we've got everything in the final locations, we can |
3749 | * find optional sections. */ | |
eb3057df FH |
3750 | err = find_module_sections(mod, info); |
3751 | if (err) | |
3752 | goto free_unload; | |
9b37ccfc | 3753 | |
49668688 | 3754 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3755 | if (err) |
3756 | goto free_unload; | |
9841d61d | 3757 | |
c988d2b2 | 3758 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3759 | setup_modinfo(mod, info); |
c988d2b2 | 3760 | |
1da177e4 | 3761 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3762 | err = simplify_symbols(mod, info); |
1da177e4 | 3763 | if (err < 0) |
d913188c | 3764 | goto free_modinfo; |
1da177e4 | 3765 | |
34e1169d | 3766 | err = apply_relocations(mod, info); |
22e268eb | 3767 | if (err < 0) |
d913188c | 3768 | goto free_modinfo; |
1da177e4 | 3769 | |
34e1169d | 3770 | err = post_relocation(mod, info); |
1da177e4 | 3771 | if (err < 0) |
d913188c | 3772 | goto free_modinfo; |
1da177e4 | 3773 | |
22e268eb | 3774 | flush_module_icache(mod); |
378bac82 | 3775 | |
6526c534 RR |
3776 | /* Now copy in args */ |
3777 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3778 | if (IS_ERR(mod->args)) { | |
3779 | err = PTR_ERR(mod->args); | |
3780 | goto free_arch_cleanup; | |
3781 | } | |
8d3b33f6 | 3782 | |
52796312 | 3783 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3784 | |
a949ae56 SRRH |
3785 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3786 | ftrace_module_init(mod); | |
3787 | ||
a3535c7e RR |
3788 | /* Finally it's fully formed, ready to start executing. */ |
3789 | err = complete_formation(mod, info); | |
3790 | if (err) | |
1fb9341a | 3791 | goto ddebug_cleanup; |
be593f4c | 3792 | |
4c973d16 JY |
3793 | err = prepare_coming_module(mod); |
3794 | if (err) | |
3795 | goto bug_cleanup; | |
3796 | ||
51f3d0f4 | 3797 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3798 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3799 | -32768, 32767, mod, |
ecc86170 | 3800 | unknown_module_param_cb); |
51e158c1 RR |
3801 | if (IS_ERR(after_dashes)) { |
3802 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3803 | goto coming_cleanup; |
51e158c1 RR |
3804 | } else if (after_dashes) { |
3805 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3806 | mod->name, after_dashes); | |
3807 | } | |
1da177e4 | 3808 | |
ca86cad7 | 3809 | /* Link in to sysfs. */ |
34e1169d | 3810 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3811 | if (err < 0) |
4c973d16 | 3812 | goto coming_cleanup; |
80a3d1bb | 3813 | |
1ce15ef4 JY |
3814 | if (is_livepatch_module(mod)) { |
3815 | err = copy_module_elf(mod, info); | |
3816 | if (err < 0) | |
3817 | goto sysfs_cleanup; | |
3818 | } | |
3819 | ||
48fd1188 | 3820 | /* Get rid of temporary copy. */ |
34e1169d | 3821 | free_copy(info); |
1da177e4 LT |
3822 | |
3823 | /* Done! */ | |
51f3d0f4 | 3824 | trace_module_load(mod); |
34e1169d KC |
3825 | |
3826 | return do_init_module(mod); | |
1da177e4 | 3827 | |
1ce15ef4 JY |
3828 | sysfs_cleanup: |
3829 | mod_sysfs_teardown(mod); | |
4c973d16 | 3830 | coming_cleanup: |
885a78d4 | 3831 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3832 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3833 | blocking_notifier_call_chain(&module_notify_list, |
3834 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3835 | klp_module_going(mod); |
1fb9341a RR |
3836 | bug_cleanup: |
3837 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3838 | mutex_lock(&module_mutex); |
5336377d | 3839 | module_bug_cleanup(mod); |
ee61abb3 | 3840 | mutex_unlock(&module_mutex); |
ff7e0055 | 3841 | |
a3535c7e | 3842 | ddebug_cleanup: |
1323eac7 | 3843 | ftrace_release_mod(mod); |
52796312 | 3844 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 3845 | synchronize_rcu(); |
6526c534 RR |
3846 | kfree(mod->args); |
3847 | free_arch_cleanup: | |
1da177e4 | 3848 | module_arch_cleanup(mod); |
d913188c | 3849 | free_modinfo: |
a263f776 | 3850 | free_modinfo(mod); |
22e268eb | 3851 | free_unload: |
1da177e4 | 3852 | module_unload_free(mod); |
1fb9341a RR |
3853 | unlink_mod: |
3854 | mutex_lock(&module_mutex); | |
3855 | /* Unlink carefully: kallsyms could be walking list. */ | |
3856 | list_del_rcu(&mod->list); | |
758556bd | 3857 | mod_tree_remove(mod); |
1fb9341a | 3858 | wake_up_all(&module_wq); |
0be964be | 3859 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 3860 | synchronize_rcu(); |
1fb9341a | 3861 | mutex_unlock(&module_mutex); |
d913188c | 3862 | free_module: |
35a9393c | 3863 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3864 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3865 | |
34e1169d | 3866 | module_deallocate(mod, info); |
d913188c | 3867 | free_copy: |
34e1169d KC |
3868 | free_copy(info); |
3869 | return err; | |
b99b87f7 PO |
3870 | } |
3871 | ||
17da2bd9 HC |
3872 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3873 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3874 | { |
34e1169d KC |
3875 | int err; |
3876 | struct load_info info = { }; | |
1da177e4 | 3877 | |
34e1169d KC |
3878 | err = may_init_module(); |
3879 | if (err) | |
3880 | return err; | |
1da177e4 | 3881 | |
34e1169d KC |
3882 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3883 | umod, len, uargs); | |
1da177e4 | 3884 | |
34e1169d KC |
3885 | err = copy_module_from_user(umod, len, &info); |
3886 | if (err) | |
3887 | return err; | |
1da177e4 | 3888 | |
2f3238ae | 3889 | return load_module(&info, uargs, 0); |
34e1169d | 3890 | } |
94462ad3 | 3891 | |
2f3238ae | 3892 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3893 | { |
34e1169d | 3894 | struct load_info info = { }; |
a1db7420 MZ |
3895 | loff_t size; |
3896 | void *hdr; | |
3897 | int err; | |
94462ad3 | 3898 | |
34e1169d KC |
3899 | err = may_init_module(); |
3900 | if (err) | |
3901 | return err; | |
1da177e4 | 3902 | |
2f3238ae | 3903 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3904 | |
2f3238ae RR |
3905 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3906 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3907 | return -EINVAL; | |
d6de2c80 | 3908 | |
a1db7420 MZ |
3909 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
3910 | READING_MODULE); | |
34e1169d KC |
3911 | if (err) |
3912 | return err; | |
a1db7420 MZ |
3913 | info.hdr = hdr; |
3914 | info.len = size; | |
1da177e4 | 3915 | |
2f3238ae | 3916 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3917 | } |
3918 | ||
3919 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3920 | { | |
3921 | return ((void *)addr >= start && (void *)addr < start + size); | |
3922 | } | |
3923 | ||
3924 | #ifdef CONFIG_KALLSYMS | |
3925 | /* | |
3926 | * This ignores the intensely annoying "mapping symbols" found | |
3927 | * in ARM ELF files: $a, $t and $d. | |
3928 | */ | |
3929 | static inline int is_arm_mapping_symbol(const char *str) | |
3930 | { | |
2e3a10a1 RK |
3931 | if (str[0] == '.' && str[1] == 'L') |
3932 | return true; | |
6c34f1f5 | 3933 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3934 | && (str[2] == '\0' || str[2] == '.'); |
3935 | } | |
3936 | ||
2d25bc55 | 3937 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 3938 | { |
8244062e | 3939 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
3940 | } |
3941 | ||
2d25bc55 JY |
3942 | /* |
3943 | * Given a module and address, find the corresponding symbol and return its name | |
3944 | * while providing its size and offset if needed. | |
3945 | */ | |
3946 | static const char *find_kallsyms_symbol(struct module *mod, | |
3947 | unsigned long addr, | |
3948 | unsigned long *size, | |
3949 | unsigned long *offset) | |
1da177e4 LT |
3950 | { |
3951 | unsigned int i, best = 0; | |
93d77e7f | 3952 | unsigned long nextval, bestval; |
8244062e | 3953 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
3954 | |
3955 | /* At worse, next value is at end of module */ | |
a06f6211 | 3956 | if (within_module_init(addr, mod)) |
7523e4dc | 3957 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 3958 | else |
7523e4dc | 3959 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 3960 | |
93d77e7f VW |
3961 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
3962 | ||
25985edc | 3963 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3964 | starts real symbols at 1). */ |
8244062e | 3965 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
3966 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
3967 | unsigned long thisval = kallsyms_symbol_value(sym); | |
3968 | ||
3969 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
3970 | continue; |
3971 | ||
3972 | /* We ignore unnamed symbols: they're uninformative | |
3973 | * and inserted at a whim. */ | |
2d25bc55 JY |
3974 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
3975 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
3976 | continue; |
3977 | ||
93d77e7f | 3978 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 3979 | best = i; |
93d77e7f VW |
3980 | bestval = thisval; |
3981 | } | |
3982 | if (thisval > addr && thisval < nextval) | |
3983 | nextval = thisval; | |
1da177e4 LT |
3984 | } |
3985 | ||
3986 | if (!best) | |
3987 | return NULL; | |
3988 | ||
ffb45122 | 3989 | if (size) |
93d77e7f | 3990 | *size = nextval - bestval; |
ffb45122 | 3991 | if (offset) |
93d77e7f | 3992 | *offset = addr - bestval; |
2d25bc55 JY |
3993 | |
3994 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
3995 | } |
3996 | ||
b865ea64 SS |
3997 | void * __weak dereference_module_function_descriptor(struct module *mod, |
3998 | void *ptr) | |
3999 | { | |
4000 | return ptr; | |
4001 | } | |
4002 | ||
6dd06c9f RR |
4003 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
4004 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 4005 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
4006 | unsigned long *size, |
4007 | unsigned long *offset, | |
4008 | char **modname, | |
4009 | char *namebuf) | |
1da177e4 | 4010 | { |
cb2a5205 | 4011 | const char *ret = NULL; |
b7df4d1b | 4012 | struct module *mod; |
1da177e4 | 4013 | |
cb2a5205 | 4014 | preempt_disable(); |
b7df4d1b PZ |
4015 | mod = __module_address(addr); |
4016 | if (mod) { | |
4017 | if (modname) | |
4018 | *modname = mod->name; | |
2d25bc55 JY |
4019 | |
4020 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4021 | } |
6dd06c9f RR |
4022 | /* Make a copy in here where it's safe */ |
4023 | if (ret) { | |
4024 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4025 | ret = namebuf; | |
4026 | } | |
cb2a5205 | 4027 | preempt_enable(); |
b7df4d1b | 4028 | |
92dfc9dc | 4029 | return ret; |
1da177e4 LT |
4030 | } |
4031 | ||
9d65cb4a AD |
4032 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4033 | { | |
4034 | struct module *mod; | |
4035 | ||
cb2a5205 | 4036 | preempt_disable(); |
d72b3751 | 4037 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4038 | if (mod->state == MODULE_STATE_UNFORMED) |
4039 | continue; | |
9b20a352 | 4040 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4041 | const char *sym; |
4042 | ||
2d25bc55 | 4043 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4044 | if (!sym) |
4045 | goto out; | |
2d25bc55 | 4046 | |
9281acea | 4047 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4048 | preempt_enable(); |
9d65cb4a AD |
4049 | return 0; |
4050 | } | |
4051 | } | |
4052 | out: | |
cb2a5205 | 4053 | preempt_enable(); |
9d65cb4a AD |
4054 | return -ERANGE; |
4055 | } | |
4056 | ||
a5c43dae AD |
4057 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4058 | unsigned long *offset, char *modname, char *name) | |
4059 | { | |
4060 | struct module *mod; | |
4061 | ||
cb2a5205 | 4062 | preempt_disable(); |
d72b3751 | 4063 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4064 | if (mod->state == MODULE_STATE_UNFORMED) |
4065 | continue; | |
9b20a352 | 4066 | if (within_module(addr, mod)) { |
a5c43dae AD |
4067 | const char *sym; |
4068 | ||
2d25bc55 | 4069 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4070 | if (!sym) |
4071 | goto out; | |
4072 | if (modname) | |
9281acea | 4073 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4074 | if (name) |
9281acea | 4075 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4076 | preempt_enable(); |
a5c43dae AD |
4077 | return 0; |
4078 | } | |
4079 | } | |
4080 | out: | |
cb2a5205 | 4081 | preempt_enable(); |
a5c43dae AD |
4082 | return -ERANGE; |
4083 | } | |
4084 | ||
ea07890a AD |
4085 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4086 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4087 | { |
4088 | struct module *mod; | |
4089 | ||
cb2a5205 | 4090 | preempt_disable(); |
d72b3751 | 4091 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4092 | struct mod_kallsyms *kallsyms; |
4093 | ||
0d21b0e3 RR |
4094 | if (mod->state == MODULE_STATE_UNFORMED) |
4095 | continue; | |
8244062e RR |
4096 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4097 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4098 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4099 | ||
4100 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4101 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4102 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4103 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4104 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4105 | preempt_enable(); |
ea07890a | 4106 | return 0; |
1da177e4 | 4107 | } |
8244062e | 4108 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4109 | } |
cb2a5205 | 4110 | preempt_enable(); |
ea07890a | 4111 | return -ERANGE; |
1da177e4 LT |
4112 | } |
4113 | ||
2d25bc55 JY |
4114 | /* Given a module and name of symbol, find and return the symbol's value */ |
4115 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4116 | { |
4117 | unsigned int i; | |
8244062e | 4118 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4119 | |
93d77e7f VW |
4120 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4121 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4122 | ||
2d25bc55 | 4123 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4124 | sym->st_shndx != SHN_UNDEF) |
4125 | return kallsyms_symbol_value(sym); | |
4126 | } | |
1da177e4 LT |
4127 | return 0; |
4128 | } | |
4129 | ||
4130 | /* Look for this name: can be of form module:name. */ | |
4131 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4132 | { | |
4133 | struct module *mod; | |
4134 | char *colon; | |
4135 | unsigned long ret = 0; | |
4136 | ||
4137 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4138 | preempt_disable(); |
17586188 | 4139 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4140 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4141 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4142 | } else { |
0d21b0e3 RR |
4143 | list_for_each_entry_rcu(mod, &modules, list) { |
4144 | if (mod->state == MODULE_STATE_UNFORMED) | |
4145 | continue; | |
2d25bc55 | 4146 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4147 | break; |
0d21b0e3 | 4148 | } |
1da177e4 | 4149 | } |
cb2a5205 | 4150 | preempt_enable(); |
1da177e4 LT |
4151 | return ret; |
4152 | } | |
75a66614 AK |
4153 | |
4154 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4155 | struct module *, unsigned long), | |
4156 | void *data) | |
4157 | { | |
4158 | struct module *mod; | |
4159 | unsigned int i; | |
4160 | int ret; | |
4161 | ||
0be964be PZ |
4162 | module_assert_mutex(); |
4163 | ||
75a66614 | 4164 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4165 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4166 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4167 | ||
0d21b0e3 RR |
4168 | if (mod->state == MODULE_STATE_UNFORMED) |
4169 | continue; | |
8244062e | 4170 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4171 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4172 | |
93d77e7f | 4173 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4174 | continue; |
4175 | ||
2d25bc55 | 4176 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4177 | mod, kallsyms_symbol_value(sym)); |
75a66614 AK |
4178 | if (ret != 0) |
4179 | return ret; | |
4180 | } | |
4181 | } | |
4182 | return 0; | |
4183 | } | |
1da177e4 LT |
4184 | #endif /* CONFIG_KALLSYMS */ |
4185 | ||
7fd8329b PM |
4186 | /* Maximum number of characters written by module_flags() */ |
4187 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4188 | ||
4189 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4190 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4191 | { |
4192 | int bx = 0; | |
4193 | ||
0d21b0e3 | 4194 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4195 | if (mod->taints || |
4196 | mod->state == MODULE_STATE_GOING || | |
4197 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4198 | buf[bx++] = '('; |
cca3e707 | 4199 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4200 | /* Show a - for module-is-being-unloaded */ |
4201 | if (mod->state == MODULE_STATE_GOING) | |
4202 | buf[bx++] = '-'; | |
4203 | /* Show a + for module-is-being-loaded */ | |
4204 | if (mod->state == MODULE_STATE_COMING) | |
4205 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4206 | buf[bx++] = ')'; |
4207 | } | |
4208 | buf[bx] = '\0'; | |
4209 | ||
4210 | return buf; | |
4211 | } | |
4212 | ||
3b5d5c6b AD |
4213 | #ifdef CONFIG_PROC_FS |
4214 | /* Called by the /proc file system to return a list of modules. */ | |
4215 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4216 | { | |
4217 | mutex_lock(&module_mutex); | |
4218 | return seq_list_start(&modules, *pos); | |
4219 | } | |
4220 | ||
4221 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4222 | { | |
4223 | return seq_list_next(p, &modules, pos); | |
4224 | } | |
4225 | ||
4226 | static void m_stop(struct seq_file *m, void *p) | |
4227 | { | |
4228 | mutex_unlock(&module_mutex); | |
4229 | } | |
4230 | ||
1da177e4 LT |
4231 | static int m_show(struct seq_file *m, void *p) |
4232 | { | |
4233 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4234 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4235 | void *value; |
fa3ba2e8 | 4236 | |
0d21b0e3 RR |
4237 | /* We always ignore unformed modules. */ |
4238 | if (mod->state == MODULE_STATE_UNFORMED) | |
4239 | return 0; | |
4240 | ||
2f0f2a33 | 4241 | seq_printf(m, "%s %u", |
7523e4dc | 4242 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4243 | print_unload_info(m, mod); |
4244 | ||
4245 | /* Informative for users. */ | |
4246 | seq_printf(m, " %s", | |
6da0b565 IA |
4247 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4248 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4249 | "Live"); |
4250 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4251 | value = m->private ? NULL : mod->core_layout.base; |
4252 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4253 | |
fa3ba2e8 FM |
4254 | /* Taints info */ |
4255 | if (mod->taints) | |
21aa9280 | 4256 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4257 | |
6da0b565 | 4258 | seq_puts(m, "\n"); |
1da177e4 LT |
4259 | return 0; |
4260 | } | |
4261 | ||
4262 | /* Format: modulename size refcount deps address | |
4263 | ||
4264 | Where refcount is a number or -, and deps is a comma-separated list | |
4265 | of depends or -. | |
4266 | */ | |
3b5d5c6b | 4267 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4268 | .start = m_start, |
4269 | .next = m_next, | |
4270 | .stop = m_stop, | |
4271 | .show = m_show | |
4272 | }; | |
4273 | ||
516fb7f2 LT |
4274 | /* |
4275 | * This also sets the "private" pointer to non-NULL if the | |
4276 | * kernel pointers should be hidden (so you can just test | |
4277 | * "m->private" to see if you should keep the values private). | |
4278 | * | |
4279 | * We use the same logic as for /proc/kallsyms. | |
4280 | */ | |
3b5d5c6b AD |
4281 | static int modules_open(struct inode *inode, struct file *file) |
4282 | { | |
516fb7f2 LT |
4283 | int err = seq_open(file, &modules_op); |
4284 | ||
4285 | if (!err) { | |
4286 | struct seq_file *m = file->private_data; | |
4287 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4288 | } | |
4289 | ||
3f553b30 | 4290 | return err; |
3b5d5c6b AD |
4291 | } |
4292 | ||
4293 | static const struct file_operations proc_modules_operations = { | |
4294 | .open = modules_open, | |
4295 | .read = seq_read, | |
4296 | .llseek = seq_lseek, | |
4297 | .release = seq_release, | |
4298 | }; | |
4299 | ||
4300 | static int __init proc_modules_init(void) | |
4301 | { | |
4302 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4303 | return 0; | |
4304 | } | |
4305 | module_init(proc_modules_init); | |
4306 | #endif | |
4307 | ||
1da177e4 LT |
4308 | /* Given an address, look for it in the module exception tables. */ |
4309 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4310 | { | |
1da177e4 LT |
4311 | const struct exception_table_entry *e = NULL; |
4312 | struct module *mod; | |
4313 | ||
24da1cbf | 4314 | preempt_disable(); |
5ff22646 PZ |
4315 | mod = __module_address(addr); |
4316 | if (!mod) | |
4317 | goto out; | |
22a8bdeb | 4318 | |
5ff22646 PZ |
4319 | if (!mod->num_exentries) |
4320 | goto out; | |
4321 | ||
4322 | e = search_extable(mod->extable, | |
a94c33dd | 4323 | mod->num_exentries, |
5ff22646 PZ |
4324 | addr); |
4325 | out: | |
24da1cbf | 4326 | preempt_enable(); |
1da177e4 | 4327 | |
5ff22646 PZ |
4328 | /* |
4329 | * Now, if we found one, we are running inside it now, hence | |
4330 | * we cannot unload the module, hence no refcnt needed. | |
4331 | */ | |
1da177e4 LT |
4332 | return e; |
4333 | } | |
4334 | ||
4d435f9d | 4335 | /* |
e610499e RR |
4336 | * is_module_address - is this address inside a module? |
4337 | * @addr: the address to check. | |
4338 | * | |
4339 | * See is_module_text_address() if you simply want to see if the address | |
4340 | * is code (not data). | |
4d435f9d | 4341 | */ |
e610499e | 4342 | bool is_module_address(unsigned long addr) |
4d435f9d | 4343 | { |
e610499e | 4344 | bool ret; |
4d435f9d | 4345 | |
24da1cbf | 4346 | preempt_disable(); |
e610499e | 4347 | ret = __module_address(addr) != NULL; |
24da1cbf | 4348 | preempt_enable(); |
4d435f9d | 4349 | |
e610499e | 4350 | return ret; |
4d435f9d IM |
4351 | } |
4352 | ||
e610499e RR |
4353 | /* |
4354 | * __module_address - get the module which contains an address. | |
4355 | * @addr: the address. | |
4356 | * | |
4357 | * Must be called with preempt disabled or module mutex held so that | |
4358 | * module doesn't get freed during this. | |
4359 | */ | |
714f83d5 | 4360 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4361 | { |
4362 | struct module *mod; | |
4363 | ||
3a642e99 RR |
4364 | if (addr < module_addr_min || addr > module_addr_max) |
4365 | return NULL; | |
4366 | ||
0be964be PZ |
4367 | module_assert_mutex_or_preempt(); |
4368 | ||
6c9692e2 | 4369 | mod = mod_find(addr); |
93c2e105 PZ |
4370 | if (mod) { |
4371 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4372 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4373 | mod = NULL; |
0d21b0e3 | 4374 | } |
93c2e105 | 4375 | return mod; |
1da177e4 | 4376 | } |
c6b37801 | 4377 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4378 | |
e610499e RR |
4379 | /* |
4380 | * is_module_text_address - is this address inside module code? | |
4381 | * @addr: the address to check. | |
4382 | * | |
4383 | * See is_module_address() if you simply want to see if the address is | |
4384 | * anywhere in a module. See kernel_text_address() for testing if an | |
4385 | * address corresponds to kernel or module code. | |
4386 | */ | |
4387 | bool is_module_text_address(unsigned long addr) | |
4388 | { | |
4389 | bool ret; | |
4390 | ||
4391 | preempt_disable(); | |
4392 | ret = __module_text_address(addr) != NULL; | |
4393 | preempt_enable(); | |
4394 | ||
4395 | return ret; | |
4396 | } | |
4397 | ||
4398 | /* | |
4399 | * __module_text_address - get the module whose code contains an address. | |
4400 | * @addr: the address. | |
4401 | * | |
4402 | * Must be called with preempt disabled or module mutex held so that | |
4403 | * module doesn't get freed during this. | |
4404 | */ | |
4405 | struct module *__module_text_address(unsigned long addr) | |
4406 | { | |
4407 | struct module *mod = __module_address(addr); | |
4408 | if (mod) { | |
4409 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4410 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4411 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4412 | mod = NULL; |
4413 | } | |
4414 | return mod; | |
4415 | } | |
c6b37801 | 4416 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4417 | |
1da177e4 LT |
4418 | /* Don't grab lock, we're oopsing. */ |
4419 | void print_modules(void) | |
4420 | { | |
4421 | struct module *mod; | |
7fd8329b | 4422 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4423 | |
b231125a | 4424 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4425 | /* Most callers should already have preempt disabled, but make sure */ |
4426 | preempt_disable(); | |
0d21b0e3 RR |
4427 | list_for_each_entry_rcu(mod, &modules, list) { |
4428 | if (mod->state == MODULE_STATE_UNFORMED) | |
4429 | continue; | |
27bba4d6 | 4430 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4431 | } |
d72b3751 | 4432 | preempt_enable(); |
e14af7ee | 4433 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4434 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4435 | pr_cont("\n"); | |
1da177e4 LT |
4436 | } |
4437 | ||
1da177e4 | 4438 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4439 | /* Generate the signature for all relevant module structures here. |
4440 | * If these change, we don't want to try to parse the module. */ | |
4441 | void module_layout(struct module *mod, | |
4442 | struct modversion_info *ver, | |
4443 | struct kernel_param *kp, | |
4444 | struct kernel_symbol *ks, | |
65498646 | 4445 | struct tracepoint * const *tp) |
8c8ef42a RR |
4446 | { |
4447 | } | |
4448 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4449 | #endif |