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Commit | Line | Data |
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f71d20e9 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 LT |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
9984de1a | 19 | #include <linux/export.h> |
1da177e4 | 20 | #include <linux/moduleloader.h> |
af658dca | 21 | #include <linux/trace_events.h> |
1da177e4 | 22 | #include <linux/init.h> |
ae84e324 | 23 | #include <linux/kallsyms.h> |
34e1169d | 24 | #include <linux/file.h> |
3b5d5c6b | 25 | #include <linux/fs.h> |
6d760133 | 26 | #include <linux/sysfs.h> |
9f158333 | 27 | #include <linux/kernel.h> |
1da177e4 LT |
28 | #include <linux/slab.h> |
29 | #include <linux/vmalloc.h> | |
30 | #include <linux/elf.h> | |
3b5d5c6b | 31 | #include <linux/proc_fs.h> |
2e72d51b | 32 | #include <linux/security.h> |
1da177e4 LT |
33 | #include <linux/seq_file.h> |
34 | #include <linux/syscalls.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/rcupdate.h> | |
c59ede7b | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/cpu.h> |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/err.h> | |
42 | #include <linux/vermagic.h> | |
43 | #include <linux/notifier.h> | |
f6a57033 | 44 | #include <linux/sched.h> |
1da177e4 | 45 | #include <linux/device.h> |
c988d2b2 | 46 | #include <linux/string.h> |
97d1f15b | 47 | #include <linux/mutex.h> |
d72b3751 | 48 | #include <linux/rculist.h> |
1da177e4 | 49 | #include <asm/uaccess.h> |
1da177e4 | 50 | #include <asm/cacheflush.h> |
eb8cdec4 | 51 | #include <asm/mmu_context.h> |
b817f6fe | 52 | #include <linux/license.h> |
6d762394 | 53 | #include <asm/sections.h> |
97e1c18e | 54 | #include <linux/tracepoint.h> |
90d595fe | 55 | #include <linux/ftrace.h> |
22a9d645 | 56 | #include <linux/async.h> |
fbf59bc9 | 57 | #include <linux/percpu.h> |
4f2294b6 | 58 | #include <linux/kmemleak.h> |
bf5438fc | 59 | #include <linux/jump_label.h> |
84e1c6bb | 60 | #include <linux/pfn.h> |
403ed278 | 61 | #include <linux/bsearch.h> |
2f3238ae | 62 | #include <uapi/linux/module.h> |
106a4ee2 | 63 | #include "module-internal.h" |
1da177e4 | 64 | |
7ead8b83 LZ |
65 | #define CREATE_TRACE_POINTS |
66 | #include <trace/events/module.h> | |
67 | ||
1da177e4 LT |
68 | #ifndef ARCH_SHF_SMALL |
69 | #define ARCH_SHF_SMALL 0 | |
70 | #endif | |
71 | ||
84e1c6bb MC |
72 | /* |
73 | * Modules' sections will be aligned on page boundaries | |
74 | * to ensure complete separation of code and data, but | |
75 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y | |
76 | */ | |
77 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
78 | # define debug_align(X) ALIGN(X, PAGE_SIZE) | |
79 | #else | |
80 | # define debug_align(X) (X) | |
81 | #endif | |
82 | ||
1da177e4 LT |
83 | /* If this is set, the section belongs in the init part of the module */ |
84 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
85 | ||
75676500 RR |
86 | /* |
87 | * Mutex protects: | |
88 | * 1) List of modules (also safely readable with preempt_disable), | |
89 | * 2) module_use links, | |
90 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 91 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
92 | DEFINE_MUTEX(module_mutex); |
93 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 94 | static LIST_HEAD(modules); |
67fc4e0c | 95 | |
6c9692e2 | 96 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 97 | |
93c2e105 PZ |
98 | /* |
99 | * Use a latched RB-tree for __module_address(); this allows us to use | |
100 | * RCU-sched lookups of the address from any context. | |
101 | * | |
6c9692e2 PZ |
102 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
103 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
104 | * NMI context. | |
93c2e105 PZ |
105 | */ |
106 | ||
107 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 108 | { |
7523e4dc | 109 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 110 | |
7523e4dc | 111 | return (unsigned long)layout->base; |
93c2e105 PZ |
112 | } |
113 | ||
114 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
115 | { | |
7523e4dc | 116 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 117 | |
7523e4dc | 118 | return (unsigned long)layout->size; |
93c2e105 PZ |
119 | } |
120 | ||
121 | static __always_inline bool | |
122 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
123 | { | |
124 | return __mod_tree_val(a) < __mod_tree_val(b); | |
125 | } | |
126 | ||
127 | static __always_inline int | |
128 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
129 | { | |
130 | unsigned long val = (unsigned long)key; | |
131 | unsigned long start, end; | |
132 | ||
133 | start = __mod_tree_val(n); | |
134 | if (val < start) | |
135 | return -1; | |
136 | ||
137 | end = start + __mod_tree_size(n); | |
138 | if (val >= end) | |
139 | return 1; | |
106a4ee2 | 140 | |
106a4ee2 RR |
141 | return 0; |
142 | } | |
143 | ||
93c2e105 PZ |
144 | static const struct latch_tree_ops mod_tree_ops = { |
145 | .less = mod_tree_less, | |
146 | .comp = mod_tree_comp, | |
147 | }; | |
148 | ||
4f666546 PZ |
149 | static struct mod_tree_root { |
150 | struct latch_tree_root root; | |
151 | unsigned long addr_min; | |
152 | unsigned long addr_max; | |
153 | } mod_tree __cacheline_aligned = { | |
154 | .addr_min = -1UL, | |
106a4ee2 | 155 | }; |
106a4ee2 | 156 | |
4f666546 PZ |
157 | #define module_addr_min mod_tree.addr_min |
158 | #define module_addr_max mod_tree.addr_max | |
159 | ||
160 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
161 | { | |
162 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
163 | } | |
164 | ||
165 | static void __mod_tree_remove(struct mod_tree_node *node) | |
166 | { | |
167 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
168 | } | |
93c2e105 PZ |
169 | |
170 | /* | |
171 | * These modifications: insert, remove_init and remove; are serialized by the | |
172 | * module_mutex. | |
173 | */ | |
174 | static void mod_tree_insert(struct module *mod) | |
175 | { | |
7523e4dc RR |
176 | mod->core_layout.mtn.mod = mod; |
177 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 178 | |
7523e4dc RR |
179 | __mod_tree_insert(&mod->core_layout.mtn); |
180 | if (mod->init_layout.size) | |
181 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
182 | } |
183 | ||
184 | static void mod_tree_remove_init(struct module *mod) | |
185 | { | |
7523e4dc RR |
186 | if (mod->init_layout.size) |
187 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
188 | } |
189 | ||
190 | static void mod_tree_remove(struct module *mod) | |
191 | { | |
7523e4dc | 192 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
193 | mod_tree_remove_init(mod); |
194 | } | |
195 | ||
6c9692e2 | 196 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
197 | { |
198 | struct latch_tree_node *ltn; | |
199 | ||
4f666546 | 200 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
201 | if (!ltn) |
202 | return NULL; | |
203 | ||
204 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
205 | } | |
206 | ||
6c9692e2 PZ |
207 | #else /* MODULES_TREE_LOOKUP */ |
208 | ||
4f666546 PZ |
209 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
210 | ||
6c9692e2 PZ |
211 | static void mod_tree_insert(struct module *mod) { } |
212 | static void mod_tree_remove_init(struct module *mod) { } | |
213 | static void mod_tree_remove(struct module *mod) { } | |
214 | ||
215 | static struct module *mod_find(unsigned long addr) | |
216 | { | |
217 | struct module *mod; | |
218 | ||
219 | list_for_each_entry_rcu(mod, &modules, list) { | |
220 | if (within_module(addr, mod)) | |
221 | return mod; | |
222 | } | |
223 | ||
224 | return NULL; | |
225 | } | |
226 | ||
227 | #endif /* MODULES_TREE_LOOKUP */ | |
228 | ||
4f666546 PZ |
229 | /* |
230 | * Bounds of module text, for speeding up __module_address. | |
231 | * Protected by module_mutex. | |
232 | */ | |
233 | static void __mod_update_bounds(void *base, unsigned int size) | |
234 | { | |
235 | unsigned long min = (unsigned long)base; | |
236 | unsigned long max = min + size; | |
237 | ||
238 | if (min < module_addr_min) | |
239 | module_addr_min = min; | |
240 | if (max > module_addr_max) | |
241 | module_addr_max = max; | |
242 | } | |
243 | ||
244 | static void mod_update_bounds(struct module *mod) | |
245 | { | |
7523e4dc RR |
246 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
247 | if (mod->init_layout.size) | |
248 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
249 | } |
250 | ||
67fc4e0c JW |
251 | #ifdef CONFIG_KGDB_KDB |
252 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
253 | #endif /* CONFIG_KGDB_KDB */ | |
254 | ||
0be964be PZ |
255 | static void module_assert_mutex(void) |
256 | { | |
257 | lockdep_assert_held(&module_mutex); | |
258 | } | |
259 | ||
260 | static void module_assert_mutex_or_preempt(void) | |
261 | { | |
262 | #ifdef CONFIG_LOCKDEP | |
263 | if (unlikely(!debug_locks)) | |
264 | return; | |
265 | ||
266 | WARN_ON(!rcu_read_lock_sched_held() && | |
267 | !lockdep_is_held(&module_mutex)); | |
268 | #endif | |
269 | } | |
270 | ||
6727bb9c LR |
271 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
272 | #ifndef CONFIG_MODULE_SIG_FORCE | |
106a4ee2 RR |
273 | module_param(sig_enforce, bool_enable_only, 0644); |
274 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
1da177e4 | 275 | |
19e4529e SR |
276 | /* Block module loading/unloading? */ |
277 | int modules_disabled = 0; | |
02608bef | 278 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 279 | |
c9a3ba55 RR |
280 | /* Waiting for a module to finish initializing? */ |
281 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
282 | ||
e041c683 | 283 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 284 | |
6da0b565 | 285 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 286 | { |
e041c683 | 287 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
288 | } |
289 | EXPORT_SYMBOL(register_module_notifier); | |
290 | ||
6da0b565 | 291 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 292 | { |
e041c683 | 293 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
294 | } |
295 | EXPORT_SYMBOL(unregister_module_notifier); | |
296 | ||
eded41c1 RR |
297 | struct load_info { |
298 | Elf_Ehdr *hdr; | |
299 | unsigned long len; | |
300 | Elf_Shdr *sechdrs; | |
6526c534 | 301 | char *secstrings, *strtab; |
d913188c | 302 | unsigned long symoffs, stroffs; |
811d66a0 RR |
303 | struct _ddebug *debug; |
304 | unsigned int num_debug; | |
106a4ee2 | 305 | bool sig_ok; |
eded41c1 RR |
306 | struct { |
307 | unsigned int sym, str, mod, vers, info, pcpu; | |
308 | } index; | |
309 | }; | |
310 | ||
9a4b9708 ML |
311 | /* We require a truly strong try_module_get(): 0 means failure due to |
312 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
313 | static inline int strong_try_module_get(struct module *mod) |
314 | { | |
0d21b0e3 | 315 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 316 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
317 | return -EBUSY; |
318 | if (try_module_get(mod)) | |
1da177e4 | 319 | return 0; |
c9a3ba55 RR |
320 | else |
321 | return -ENOENT; | |
1da177e4 LT |
322 | } |
323 | ||
373d4d09 RR |
324 | static inline void add_taint_module(struct module *mod, unsigned flag, |
325 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 326 | { |
373d4d09 | 327 | add_taint(flag, lockdep_ok); |
25ddbb18 | 328 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
329 | } |
330 | ||
02a3e59a RD |
331 | /* |
332 | * A thread that wants to hold a reference to a module only while it | |
333 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
334 | */ |
335 | void __module_put_and_exit(struct module *mod, long code) | |
336 | { | |
337 | module_put(mod); | |
338 | do_exit(code); | |
339 | } | |
340 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 341 | |
1da177e4 | 342 | /* Find a module section: 0 means not found. */ |
49668688 | 343 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
344 | { |
345 | unsigned int i; | |
346 | ||
49668688 RR |
347 | for (i = 1; i < info->hdr->e_shnum; i++) { |
348 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 349 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
350 | if ((shdr->sh_flags & SHF_ALLOC) |
351 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 352 | return i; |
49668688 | 353 | } |
1da177e4 LT |
354 | return 0; |
355 | } | |
356 | ||
5e458cc0 | 357 | /* Find a module section, or NULL. */ |
49668688 | 358 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
359 | { |
360 | /* Section 0 has sh_addr 0. */ | |
49668688 | 361 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
362 | } |
363 | ||
364 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 365 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
366 | const char *name, |
367 | size_t object_size, | |
368 | unsigned int *num) | |
369 | { | |
49668688 | 370 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
371 | |
372 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
373 | *num = info->sechdrs[sec].sh_size / object_size; |
374 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
375 | } |
376 | ||
1da177e4 LT |
377 | /* Provided by the linker */ |
378 | extern const struct kernel_symbol __start___ksymtab[]; | |
379 | extern const struct kernel_symbol __stop___ksymtab[]; | |
380 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
381 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
382 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
383 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
384 | extern const unsigned long __start___kcrctab[]; |
385 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 386 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
387 | #ifdef CONFIG_UNUSED_SYMBOLS |
388 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
389 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
390 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
391 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
392 | extern const unsigned long __start___kcrctab_unused[]; |
393 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 394 | #endif |
1da177e4 LT |
395 | |
396 | #ifndef CONFIG_MODVERSIONS | |
397 | #define symversion(base, idx) NULL | |
398 | #else | |
f83ca9fe | 399 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
400 | #endif |
401 | ||
dafd0940 RR |
402 | static bool each_symbol_in_section(const struct symsearch *arr, |
403 | unsigned int arrsize, | |
404 | struct module *owner, | |
405 | bool (*fn)(const struct symsearch *syms, | |
406 | struct module *owner, | |
de4d8d53 | 407 | void *data), |
dafd0940 | 408 | void *data) |
ad9546c9 | 409 | { |
de4d8d53 | 410 | unsigned int j; |
ad9546c9 | 411 | |
dafd0940 | 412 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
413 | if (fn(&arr[j], owner, data)) |
414 | return true; | |
f71d20e9 | 415 | } |
dafd0940 RR |
416 | |
417 | return false; | |
ad9546c9 RR |
418 | } |
419 | ||
dafd0940 | 420 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
421 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
422 | struct module *owner, | |
423 | void *data), | |
424 | void *data) | |
ad9546c9 RR |
425 | { |
426 | struct module *mod; | |
44032e63 | 427 | static const struct symsearch arr[] = { |
ad9546c9 | 428 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 429 | NOT_GPL_ONLY, false }, |
ad9546c9 | 430 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
431 | __start___kcrctab_gpl, |
432 | GPL_ONLY, false }, | |
ad9546c9 | 433 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
434 | __start___kcrctab_gpl_future, |
435 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 436 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 437 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
438 | __start___kcrctab_unused, |
439 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 440 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
441 | __start___kcrctab_unused_gpl, |
442 | GPL_ONLY, true }, | |
f7f5b675 | 443 | #endif |
ad9546c9 | 444 | }; |
f71d20e9 | 445 | |
0be964be PZ |
446 | module_assert_mutex_or_preempt(); |
447 | ||
dafd0940 RR |
448 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
449 | return true; | |
f71d20e9 | 450 | |
d72b3751 | 451 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
452 | struct symsearch arr[] = { |
453 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 454 | NOT_GPL_ONLY, false }, |
ad9546c9 | 455 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
456 | mod->gpl_crcs, |
457 | GPL_ONLY, false }, | |
ad9546c9 RR |
458 | { mod->gpl_future_syms, |
459 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
460 | mod->gpl_future_crcs, |
461 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 462 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
463 | { mod->unused_syms, |
464 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
465 | mod->unused_crcs, |
466 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
467 | { mod->unused_gpl_syms, |
468 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
469 | mod->unused_gpl_crcs, |
470 | GPL_ONLY, true }, | |
f7f5b675 | 471 | #endif |
ad9546c9 RR |
472 | }; |
473 | ||
0d21b0e3 RR |
474 | if (mod->state == MODULE_STATE_UNFORMED) |
475 | continue; | |
476 | ||
dafd0940 RR |
477 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
478 | return true; | |
479 | } | |
480 | return false; | |
481 | } | |
de4d8d53 | 482 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
483 | |
484 | struct find_symbol_arg { | |
485 | /* Input */ | |
486 | const char *name; | |
487 | bool gplok; | |
488 | bool warn; | |
489 | ||
490 | /* Output */ | |
491 | struct module *owner; | |
492 | const unsigned long *crc; | |
414fd31b | 493 | const struct kernel_symbol *sym; |
dafd0940 RR |
494 | }; |
495 | ||
de4d8d53 RR |
496 | static bool check_symbol(const struct symsearch *syms, |
497 | struct module *owner, | |
498 | unsigned int symnum, void *data) | |
dafd0940 RR |
499 | { |
500 | struct find_symbol_arg *fsa = data; | |
501 | ||
dafd0940 RR |
502 | if (!fsa->gplok) { |
503 | if (syms->licence == GPL_ONLY) | |
504 | return false; | |
505 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
506 | pr_warn("Symbol %s is being used by a non-GPL module, " |
507 | "which will not be allowed in the future\n", | |
508 | fsa->name); | |
9f28bb7e | 509 | } |
1da177e4 | 510 | } |
ad9546c9 | 511 | |
f7f5b675 | 512 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 513 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
514 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
515 | "using it.\n", fsa->name); | |
516 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
517 | pr_warn("Please evaluate if this is the right api to use and " |
518 | "if it really is, submit a report to the linux kernel " | |
519 | "mailing list together with submitting your code for " | |
bddb12b3 | 520 | "inclusion.\n"); |
dafd0940 | 521 | } |
f7f5b675 | 522 | #endif |
dafd0940 RR |
523 | |
524 | fsa->owner = owner; | |
525 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 526 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
527 | return true; |
528 | } | |
529 | ||
403ed278 AIB |
530 | static int cmp_name(const void *va, const void *vb) |
531 | { | |
532 | const char *a; | |
533 | const struct kernel_symbol *b; | |
534 | a = va; b = vb; | |
535 | return strcmp(a, b->name); | |
536 | } | |
537 | ||
de4d8d53 RR |
538 | static bool find_symbol_in_section(const struct symsearch *syms, |
539 | struct module *owner, | |
540 | void *data) | |
541 | { | |
542 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
543 | struct kernel_symbol *sym; |
544 | ||
545 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
546 | sizeof(struct kernel_symbol), cmp_name); | |
547 | ||
548 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
549 | return true; | |
de4d8d53 | 550 | |
de4d8d53 RR |
551 | return false; |
552 | } | |
553 | ||
414fd31b | 554 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 555 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
556 | const struct kernel_symbol *find_symbol(const char *name, |
557 | struct module **owner, | |
558 | const unsigned long **crc, | |
559 | bool gplok, | |
560 | bool warn) | |
dafd0940 RR |
561 | { |
562 | struct find_symbol_arg fsa; | |
563 | ||
564 | fsa.name = name; | |
565 | fsa.gplok = gplok; | |
566 | fsa.warn = warn; | |
567 | ||
de4d8d53 | 568 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
569 | if (owner) |
570 | *owner = fsa.owner; | |
571 | if (crc) | |
572 | *crc = fsa.crc; | |
414fd31b | 573 | return fsa.sym; |
dafd0940 RR |
574 | } |
575 | ||
5e124169 | 576 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 577 | return NULL; |
1da177e4 | 578 | } |
c6b37801 | 579 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 580 | |
fe0d34d2 RR |
581 | /* |
582 | * Search for module by name: must hold module_mutex (or preempt disabled | |
583 | * for read-only access). | |
584 | */ | |
4f6de4d5 | 585 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 586 | bool even_unformed) |
1da177e4 LT |
587 | { |
588 | struct module *mod; | |
589 | ||
fe0d34d2 | 590 | module_assert_mutex_or_preempt(); |
0be964be | 591 | |
1da177e4 | 592 | list_for_each_entry(mod, &modules, list) { |
0d21b0e3 RR |
593 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
594 | continue; | |
4f6de4d5 | 595 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
596 | return mod; |
597 | } | |
598 | return NULL; | |
599 | } | |
0d21b0e3 RR |
600 | |
601 | struct module *find_module(const char *name) | |
602 | { | |
fe0d34d2 | 603 | module_assert_mutex(); |
4f6de4d5 | 604 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 605 | } |
c6b37801 | 606 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
607 | |
608 | #ifdef CONFIG_SMP | |
fbf59bc9 | 609 | |
259354de | 610 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 611 | { |
259354de TH |
612 | return mod->percpu; |
613 | } | |
fbf59bc9 | 614 | |
9eb76d77 | 615 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 616 | { |
9eb76d77 RR |
617 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
618 | unsigned long align = pcpusec->sh_addralign; | |
619 | ||
620 | if (!pcpusec->sh_size) | |
621 | return 0; | |
622 | ||
fbf59bc9 | 623 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
624 | pr_warn("%s: per-cpu alignment %li > %li\n", |
625 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
626 | align = PAGE_SIZE; |
627 | } | |
628 | ||
9eb76d77 | 629 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 630 | if (!mod->percpu) { |
bddb12b3 AM |
631 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
632 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
633 | return -ENOMEM; |
634 | } | |
9eb76d77 | 635 | mod->percpu_size = pcpusec->sh_size; |
259354de | 636 | return 0; |
fbf59bc9 TH |
637 | } |
638 | ||
259354de | 639 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 640 | { |
259354de | 641 | free_percpu(mod->percpu); |
fbf59bc9 TH |
642 | } |
643 | ||
49668688 | 644 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 645 | { |
49668688 | 646 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
647 | } |
648 | ||
259354de TH |
649 | static void percpu_modcopy(struct module *mod, |
650 | const void *from, unsigned long size) | |
6b588c18 TH |
651 | { |
652 | int cpu; | |
653 | ||
654 | for_each_possible_cpu(cpu) | |
259354de | 655 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
656 | } |
657 | ||
10fad5e4 TH |
658 | /** |
659 | * is_module_percpu_address - test whether address is from module static percpu | |
660 | * @addr: address to test | |
661 | * | |
662 | * Test whether @addr belongs to module static percpu area. | |
663 | * | |
664 | * RETURNS: | |
665 | * %true if @addr is from module static percpu area | |
666 | */ | |
667 | bool is_module_percpu_address(unsigned long addr) | |
668 | { | |
669 | struct module *mod; | |
670 | unsigned int cpu; | |
671 | ||
672 | preempt_disable(); | |
673 | ||
674 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
675 | if (mod->state == MODULE_STATE_UNFORMED) |
676 | continue; | |
10fad5e4 TH |
677 | if (!mod->percpu_size) |
678 | continue; | |
679 | for_each_possible_cpu(cpu) { | |
680 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
681 | ||
682 | if ((void *)addr >= start && | |
683 | (void *)addr < start + mod->percpu_size) { | |
684 | preempt_enable(); | |
685 | return true; | |
686 | } | |
687 | } | |
688 | } | |
689 | ||
690 | preempt_enable(); | |
691 | return false; | |
6b588c18 TH |
692 | } |
693 | ||
1da177e4 | 694 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 695 | |
259354de | 696 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
697 | { |
698 | return NULL; | |
699 | } | |
9eb76d77 | 700 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 701 | { |
9eb76d77 RR |
702 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
703 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
704 | return -ENOMEM; | |
705 | return 0; | |
259354de TH |
706 | } |
707 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 708 | { |
1da177e4 | 709 | } |
49668688 | 710 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
711 | { |
712 | return 0; | |
713 | } | |
259354de TH |
714 | static inline void percpu_modcopy(struct module *mod, |
715 | const void *from, unsigned long size) | |
1da177e4 LT |
716 | { |
717 | /* pcpusec should be 0, and size of that section should be 0. */ | |
718 | BUG_ON(size != 0); | |
719 | } | |
10fad5e4 TH |
720 | bool is_module_percpu_address(unsigned long addr) |
721 | { | |
722 | return false; | |
723 | } | |
6b588c18 | 724 | |
1da177e4 LT |
725 | #endif /* CONFIG_SMP */ |
726 | ||
c988d2b2 MD |
727 | #define MODINFO_ATTR(field) \ |
728 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
729 | { \ | |
730 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
731 | } \ | |
732 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 733 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 734 | { \ |
cc56ded3 | 735 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
736 | } \ |
737 | static int modinfo_##field##_exists(struct module *mod) \ | |
738 | { \ | |
739 | return mod->field != NULL; \ | |
740 | } \ | |
741 | static void free_modinfo_##field(struct module *mod) \ | |
742 | { \ | |
22a8bdeb DW |
743 | kfree(mod->field); \ |
744 | mod->field = NULL; \ | |
c988d2b2 MD |
745 | } \ |
746 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 747 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
748 | .show = show_modinfo_##field, \ |
749 | .setup = setup_modinfo_##field, \ | |
750 | .test = modinfo_##field##_exists, \ | |
751 | .free = free_modinfo_##field, \ | |
752 | }; | |
753 | ||
754 | MODINFO_ATTR(version); | |
755 | MODINFO_ATTR(srcversion); | |
756 | ||
e14af7ee AV |
757 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
758 | ||
03e88ae1 | 759 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
760 | |
761 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
762 | ||
e513cc1c MH |
763 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
764 | #define MODULE_REF_BASE 1 | |
765 | ||
1da177e4 | 766 | /* Init the unload section of the module. */ |
9f85a4bb | 767 | static int module_unload_init(struct module *mod) |
1da177e4 | 768 | { |
e513cc1c MH |
769 | /* |
770 | * Initialize reference counter to MODULE_REF_BASE. | |
771 | * refcnt == 0 means module is going. | |
772 | */ | |
773 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 774 | |
2c02dfe7 LT |
775 | INIT_LIST_HEAD(&mod->source_list); |
776 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 777 | |
1da177e4 | 778 | /* Hold reference count during initialization. */ |
e513cc1c | 779 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
780 | |
781 | return 0; | |
1da177e4 LT |
782 | } |
783 | ||
1da177e4 LT |
784 | /* Does a already use b? */ |
785 | static int already_uses(struct module *a, struct module *b) | |
786 | { | |
787 | struct module_use *use; | |
788 | ||
2c02dfe7 LT |
789 | list_for_each_entry(use, &b->source_list, source_list) { |
790 | if (use->source == a) { | |
5e124169 | 791 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
792 | return 1; |
793 | } | |
794 | } | |
5e124169 | 795 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
796 | return 0; |
797 | } | |
798 | ||
2c02dfe7 LT |
799 | /* |
800 | * Module a uses b | |
801 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
802 | * - the module_use is added to the list of 'b' sources (so | |
803 | * 'b' can walk the list to see who sourced them), and of 'a' | |
804 | * targets (so 'a' can see what modules it targets). | |
805 | */ | |
806 | static int add_module_usage(struct module *a, struct module *b) | |
807 | { | |
2c02dfe7 LT |
808 | struct module_use *use; |
809 | ||
5e124169 | 810 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
811 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
812 | if (!use) { | |
bddb12b3 | 813 | pr_warn("%s: out of memory loading\n", a->name); |
2c02dfe7 LT |
814 | return -ENOMEM; |
815 | } | |
816 | ||
817 | use->source = a; | |
818 | use->target = b; | |
819 | list_add(&use->source_list, &b->source_list); | |
820 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
821 | return 0; |
822 | } | |
823 | ||
75676500 | 824 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 825 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 826 | { |
c8e21ced | 827 | int err; |
270a6c4c | 828 | |
9bea7f23 | 829 | if (b == NULL || already_uses(a, b)) |
218ce735 | 830 | return 0; |
218ce735 | 831 | |
9bea7f23 RR |
832 | /* If module isn't available, we fail. */ |
833 | err = strong_try_module_get(b); | |
c9a3ba55 | 834 | if (err) |
9bea7f23 | 835 | return err; |
1da177e4 | 836 | |
2c02dfe7 LT |
837 | err = add_module_usage(a, b); |
838 | if (err) { | |
1da177e4 | 839 | module_put(b); |
9bea7f23 | 840 | return err; |
1da177e4 | 841 | } |
9bea7f23 | 842 | return 0; |
1da177e4 | 843 | } |
9bea7f23 | 844 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
845 | |
846 | /* Clear the unload stuff of the module. */ | |
847 | static void module_unload_free(struct module *mod) | |
848 | { | |
2c02dfe7 | 849 | struct module_use *use, *tmp; |
1da177e4 | 850 | |
75676500 | 851 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
852 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
853 | struct module *i = use->target; | |
5e124169 | 854 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
855 | module_put(i); |
856 | list_del(&use->source_list); | |
857 | list_del(&use->target_list); | |
858 | kfree(use); | |
1da177e4 | 859 | } |
75676500 | 860 | mutex_unlock(&module_mutex); |
1da177e4 LT |
861 | } |
862 | ||
863 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 864 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
865 | { |
866 | int ret = (flags & O_TRUNC); | |
867 | if (ret) | |
373d4d09 | 868 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
869 | return ret; |
870 | } | |
871 | #else | |
fb169793 | 872 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
873 | { |
874 | return 0; | |
875 | } | |
876 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
877 | ||
e513cc1c MH |
878 | /* Try to release refcount of module, 0 means success. */ |
879 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 880 | { |
e513cc1c | 881 | int ret; |
1da177e4 | 882 | |
e513cc1c MH |
883 | /* Try to decrement refcnt which we set at loading */ |
884 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
885 | BUG_ON(ret < 0); | |
886 | if (ret) | |
887 | /* Someone can put this right now, recover with checking */ | |
888 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 889 | |
e513cc1c MH |
890 | return ret; |
891 | } | |
1da177e4 | 892 | |
e513cc1c MH |
893 | static int try_stop_module(struct module *mod, int flags, int *forced) |
894 | { | |
da39ba5e | 895 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
896 | if (try_release_module_ref(mod) != 0) { |
897 | *forced = try_force_unload(flags); | |
898 | if (!(*forced)) | |
1da177e4 LT |
899 | return -EWOULDBLOCK; |
900 | } | |
901 | ||
902 | /* Mark it as dying. */ | |
e513cc1c | 903 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 904 | |
e513cc1c | 905 | return 0; |
1da177e4 LT |
906 | } |
907 | ||
d5db139a RR |
908 | /** |
909 | * module_refcount - return the refcount or -1 if unloading | |
910 | * | |
911 | * @mod: the module we're checking | |
912 | * | |
913 | * Returns: | |
914 | * -1 if the module is in the process of unloading | |
915 | * otherwise the number of references in the kernel to the module | |
916 | */ | |
917 | int module_refcount(struct module *mod) | |
1da177e4 | 918 | { |
d5db139a | 919 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
920 | } |
921 | EXPORT_SYMBOL(module_refcount); | |
922 | ||
923 | /* This exists whether we can unload or not */ | |
924 | static void free_module(struct module *mod); | |
925 | ||
17da2bd9 HC |
926 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
927 | unsigned int, flags) | |
1da177e4 LT |
928 | { |
929 | struct module *mod; | |
dfff0a06 | 930 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
931 | int ret, forced = 0; |
932 | ||
3d43321b | 933 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
934 | return -EPERM; |
935 | ||
936 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
937 | return -EFAULT; | |
938 | name[MODULE_NAME_LEN-1] = '\0'; | |
939 | ||
3fc1f1e2 TH |
940 | if (mutex_lock_interruptible(&module_mutex) != 0) |
941 | return -EINTR; | |
1da177e4 LT |
942 | |
943 | mod = find_module(name); | |
944 | if (!mod) { | |
945 | ret = -ENOENT; | |
946 | goto out; | |
947 | } | |
948 | ||
2c02dfe7 | 949 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
950 | /* Other modules depend on us: get rid of them first. */ |
951 | ret = -EWOULDBLOCK; | |
952 | goto out; | |
953 | } | |
954 | ||
955 | /* Doing init or already dying? */ | |
956 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 957 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 958 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
959 | ret = -EBUSY; |
960 | goto out; | |
961 | } | |
962 | ||
963 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 964 | if (mod->init && !mod->exit) { |
fb169793 | 965 | forced = try_force_unload(flags); |
1da177e4 LT |
966 | if (!forced) { |
967 | /* This module can't be removed */ | |
968 | ret = -EBUSY; | |
969 | goto out; | |
970 | } | |
971 | } | |
972 | ||
1da177e4 LT |
973 | /* Stop the machine so refcounts can't move and disable module. */ |
974 | ret = try_stop_module(mod, flags, &forced); | |
975 | if (ret != 0) | |
976 | goto out; | |
977 | ||
df4b565e | 978 | mutex_unlock(&module_mutex); |
25985edc | 979 | /* Final destruction now no one is using it. */ |
df4b565e | 980 | if (mod->exit != NULL) |
1da177e4 | 981 | mod->exit(); |
df4b565e PO |
982 | blocking_notifier_call_chain(&module_notify_list, |
983 | MODULE_STATE_GOING, mod); | |
22a9d645 | 984 | async_synchronize_full(); |
75676500 | 985 | |
e14af7ee | 986 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 987 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 988 | |
75676500 RR |
989 | free_module(mod); |
990 | return 0; | |
991 | out: | |
6389a385 | 992 | mutex_unlock(&module_mutex); |
1da177e4 LT |
993 | return ret; |
994 | } | |
995 | ||
d1e99d7a | 996 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
997 | { |
998 | struct module_use *use; | |
999 | int printed_something = 0; | |
1000 | ||
d5db139a | 1001 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1002 | |
6da0b565 IA |
1003 | /* |
1004 | * Always include a trailing , so userspace can differentiate | |
1005 | * between this and the old multi-field proc format. | |
1006 | */ | |
2c02dfe7 | 1007 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1008 | printed_something = 1; |
2c02dfe7 | 1009 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1010 | } |
1011 | ||
1da177e4 LT |
1012 | if (mod->init != NULL && mod->exit == NULL) { |
1013 | printed_something = 1; | |
6da0b565 | 1014 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1015 | } |
1016 | ||
1017 | if (!printed_something) | |
6da0b565 | 1018 | seq_puts(m, "-"); |
1da177e4 LT |
1019 | } |
1020 | ||
1021 | void __symbol_put(const char *symbol) | |
1022 | { | |
1023 | struct module *owner; | |
1da177e4 | 1024 | |
24da1cbf | 1025 | preempt_disable(); |
414fd31b | 1026 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1027 | BUG(); |
1028 | module_put(owner); | |
24da1cbf | 1029 | preempt_enable(); |
1da177e4 LT |
1030 | } |
1031 | EXPORT_SYMBOL(__symbol_put); | |
1032 | ||
7d1d16e4 | 1033 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1034 | void symbol_put_addr(void *addr) |
1035 | { | |
5e376613 | 1036 | struct module *modaddr; |
7d1d16e4 | 1037 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1038 | |
7d1d16e4 | 1039 | if (core_kernel_text(a)) |
5e376613 | 1040 | return; |
1da177e4 | 1041 | |
275d7d44 PZ |
1042 | /* |
1043 | * Even though we hold a reference on the module; we still need to | |
1044 | * disable preemption in order to safely traverse the data structure. | |
1045 | */ | |
1046 | preempt_disable(); | |
7d1d16e4 | 1047 | modaddr = __module_text_address(a); |
a6e6abd5 | 1048 | BUG_ON(!modaddr); |
5e376613 | 1049 | module_put(modaddr); |
275d7d44 | 1050 | preempt_enable(); |
1da177e4 LT |
1051 | } |
1052 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1053 | ||
1054 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1055 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1056 | { |
d5db139a | 1057 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1058 | } |
1059 | ||
cca3e707 KS |
1060 | static struct module_attribute modinfo_refcnt = |
1061 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1062 | |
d53799be SR |
1063 | void __module_get(struct module *module) |
1064 | { | |
1065 | if (module) { | |
1066 | preempt_disable(); | |
2f35c41f | 1067 | atomic_inc(&module->refcnt); |
d53799be SR |
1068 | trace_module_get(module, _RET_IP_); |
1069 | preempt_enable(); | |
1070 | } | |
1071 | } | |
1072 | EXPORT_SYMBOL(__module_get); | |
1073 | ||
1074 | bool try_module_get(struct module *module) | |
1075 | { | |
1076 | bool ret = true; | |
1077 | ||
1078 | if (module) { | |
1079 | preempt_disable(); | |
e513cc1c MH |
1080 | /* Note: here, we can fail to get a reference */ |
1081 | if (likely(module_is_live(module) && | |
1082 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1083 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1084 | else |
d53799be SR |
1085 | ret = false; |
1086 | ||
1087 | preempt_enable(); | |
1088 | } | |
1089 | return ret; | |
1090 | } | |
1091 | EXPORT_SYMBOL(try_module_get); | |
1092 | ||
f6a57033 AV |
1093 | void module_put(struct module *module) |
1094 | { | |
e513cc1c MH |
1095 | int ret; |
1096 | ||
f6a57033 | 1097 | if (module) { |
e1783a24 | 1098 | preempt_disable(); |
e513cc1c MH |
1099 | ret = atomic_dec_if_positive(&module->refcnt); |
1100 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1101 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1102 | preempt_enable(); |
f6a57033 AV |
1103 | } |
1104 | } | |
1105 | EXPORT_SYMBOL(module_put); | |
1106 | ||
1da177e4 | 1107 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1108 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1109 | { |
1110 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1111 | seq_puts(m, " - -"); |
1da177e4 LT |
1112 | } |
1113 | ||
1114 | static inline void module_unload_free(struct module *mod) | |
1115 | { | |
1116 | } | |
1117 | ||
9bea7f23 | 1118 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1119 | { |
9bea7f23 | 1120 | return strong_try_module_get(b); |
1da177e4 | 1121 | } |
9bea7f23 | 1122 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1123 | |
9f85a4bb | 1124 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1125 | { |
9f85a4bb | 1126 | return 0; |
1da177e4 LT |
1127 | } |
1128 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1129 | ||
53999bf3 KW |
1130 | static size_t module_flags_taint(struct module *mod, char *buf) |
1131 | { | |
1132 | size_t l = 0; | |
1133 | ||
1134 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) | |
1135 | buf[l++] = 'P'; | |
1136 | if (mod->taints & (1 << TAINT_OOT_MODULE)) | |
1137 | buf[l++] = 'O'; | |
1138 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) | |
1139 | buf[l++] = 'F'; | |
1140 | if (mod->taints & (1 << TAINT_CRAP)) | |
1141 | buf[l++] = 'C'; | |
66cc69e3 | 1142 | if (mod->taints & (1 << TAINT_UNSIGNED_MODULE)) |
57673c2b | 1143 | buf[l++] = 'E'; |
53999bf3 KW |
1144 | /* |
1145 | * TAINT_FORCED_RMMOD: could be added. | |
8c90487c | 1146 | * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
53999bf3 KW |
1147 | * apply to modules. |
1148 | */ | |
1149 | return l; | |
1150 | } | |
1151 | ||
1f71740a | 1152 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1153 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1154 | { |
1155 | const char *state = "unknown"; | |
1156 | ||
4befb026 | 1157 | switch (mk->mod->state) { |
1f71740a KS |
1158 | case MODULE_STATE_LIVE: |
1159 | state = "live"; | |
1160 | break; | |
1161 | case MODULE_STATE_COMING: | |
1162 | state = "coming"; | |
1163 | break; | |
1164 | case MODULE_STATE_GOING: | |
1165 | state = "going"; | |
1166 | break; | |
0d21b0e3 RR |
1167 | default: |
1168 | BUG(); | |
1f71740a KS |
1169 | } |
1170 | return sprintf(buffer, "%s\n", state); | |
1171 | } | |
1172 | ||
cca3e707 KS |
1173 | static struct module_attribute modinfo_initstate = |
1174 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1175 | |
88bfa324 KS |
1176 | static ssize_t store_uevent(struct module_attribute *mattr, |
1177 | struct module_kobject *mk, | |
1178 | const char *buffer, size_t count) | |
1179 | { | |
1180 | enum kobject_action action; | |
1181 | ||
1182 | if (kobject_action_type(buffer, count, &action) == 0) | |
1183 | kobject_uevent(&mk->kobj, action); | |
1184 | return count; | |
1185 | } | |
1186 | ||
cca3e707 KS |
1187 | struct module_attribute module_uevent = |
1188 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1189 | ||
1190 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1191 | struct module_kobject *mk, char *buffer) | |
1192 | { | |
7523e4dc | 1193 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1194 | } |
1195 | ||
1196 | static struct module_attribute modinfo_coresize = | |
1197 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1198 | ||
1199 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1200 | struct module_kobject *mk, char *buffer) | |
1201 | { | |
7523e4dc | 1202 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1203 | } |
1204 | ||
1205 | static struct module_attribute modinfo_initsize = | |
1206 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1207 | ||
1208 | static ssize_t show_taint(struct module_attribute *mattr, | |
1209 | struct module_kobject *mk, char *buffer) | |
1210 | { | |
1211 | size_t l; | |
1212 | ||
1213 | l = module_flags_taint(mk->mod, buffer); | |
1214 | buffer[l++] = '\n'; | |
1215 | return l; | |
1216 | } | |
1217 | ||
1218 | static struct module_attribute modinfo_taint = | |
1219 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1220 | |
03e88ae1 | 1221 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1222 | &module_uevent, |
03e88ae1 GKH |
1223 | &modinfo_version, |
1224 | &modinfo_srcversion, | |
cca3e707 KS |
1225 | &modinfo_initstate, |
1226 | &modinfo_coresize, | |
1227 | &modinfo_initsize, | |
1228 | &modinfo_taint, | |
03e88ae1 | 1229 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1230 | &modinfo_refcnt, |
03e88ae1 GKH |
1231 | #endif |
1232 | NULL, | |
1233 | }; | |
1234 | ||
1da177e4 LT |
1235 | static const char vermagic[] = VERMAGIC_STRING; |
1236 | ||
c6e665c8 | 1237 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1238 | { |
1239 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1240 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1241 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1242 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1243 | return 0; |
1244 | #else | |
1245 | return -ENOEXEC; | |
1246 | #endif | |
1247 | } | |
1248 | ||
1da177e4 | 1249 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
1250 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1251 | static unsigned long maybe_relocated(unsigned long crc, | |
1252 | const struct module *crc_owner) | |
1253 | { | |
1254 | #ifdef ARCH_RELOCATES_KCRCTAB | |
1255 | if (crc_owner == NULL) | |
1256 | return crc - (unsigned long)reloc_start; | |
1257 | #endif | |
1258 | return crc; | |
1259 | } | |
1260 | ||
1da177e4 LT |
1261 | static int check_version(Elf_Shdr *sechdrs, |
1262 | unsigned int versindex, | |
1263 | const char *symname, | |
6da0b565 | 1264 | struct module *mod, |
d4703aef RR |
1265 | const unsigned long *crc, |
1266 | const struct module *crc_owner) | |
1da177e4 LT |
1267 | { |
1268 | unsigned int i, num_versions; | |
1269 | struct modversion_info *versions; | |
1270 | ||
1271 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1272 | if (!crc) | |
1273 | return 1; | |
1274 | ||
a5dd6970 RR |
1275 | /* No versions at all? modprobe --force does this. */ |
1276 | if (versindex == 0) | |
1277 | return try_to_force_load(mod, symname) == 0; | |
1278 | ||
1da177e4 LT |
1279 | versions = (void *) sechdrs[versindex].sh_addr; |
1280 | num_versions = sechdrs[versindex].sh_size | |
1281 | / sizeof(struct modversion_info); | |
1282 | ||
1283 | for (i = 0; i < num_versions; i++) { | |
1284 | if (strcmp(versions[i].name, symname) != 0) | |
1285 | continue; | |
1286 | ||
d4703aef | 1287 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1288 | return 1; |
5e124169 | 1289 | pr_debug("Found checksum %lX vs module %lX\n", |
d4703aef | 1290 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1291 | goto bad_version; |
1da177e4 | 1292 | } |
826e4506 | 1293 | |
bddb12b3 | 1294 | pr_warn("%s: no symbol version for %s\n", mod->name, symname); |
a5dd6970 | 1295 | return 0; |
826e4506 LT |
1296 | |
1297 | bad_version: | |
6da0b565 | 1298 | pr_warn("%s: disagrees about version of symbol %s\n", |
826e4506 LT |
1299 | mod->name, symname); |
1300 | return 0; | |
1da177e4 LT |
1301 | } |
1302 | ||
1303 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1304 | unsigned int versindex, | |
1305 | struct module *mod) | |
1306 | { | |
1307 | const unsigned long *crc; | |
1da177e4 | 1308 | |
926a59b1 PZ |
1309 | /* |
1310 | * Since this should be found in kernel (which can't be removed), no | |
1311 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1312 | */ | |
1313 | preempt_disable(); | |
b92021b0 | 1314 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
926a59b1 PZ |
1315 | &crc, true, false)) { |
1316 | preempt_enable(); | |
1da177e4 | 1317 | BUG(); |
926a59b1 PZ |
1318 | } |
1319 | preempt_enable(); | |
a4b6a77b JH |
1320 | return check_version(sechdrs, versindex, |
1321 | VMLINUX_SYMBOL_STR(module_layout), mod, crc, | |
d4703aef | 1322 | NULL); |
1da177e4 LT |
1323 | } |
1324 | ||
91e37a79 RR |
1325 | /* First part is kernel version, which we ignore if module has crcs. */ |
1326 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1327 | bool has_crcs) | |
1da177e4 | 1328 | { |
91e37a79 RR |
1329 | if (has_crcs) { |
1330 | amagic += strcspn(amagic, " "); | |
1331 | bmagic += strcspn(bmagic, " "); | |
1332 | } | |
1da177e4 LT |
1333 | return strcmp(amagic, bmagic) == 0; |
1334 | } | |
1335 | #else | |
1336 | static inline int check_version(Elf_Shdr *sechdrs, | |
1337 | unsigned int versindex, | |
1338 | const char *symname, | |
6da0b565 | 1339 | struct module *mod, |
d4703aef RR |
1340 | const unsigned long *crc, |
1341 | const struct module *crc_owner) | |
1da177e4 LT |
1342 | { |
1343 | return 1; | |
1344 | } | |
1345 | ||
1346 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1347 | unsigned int versindex, | |
1348 | struct module *mod) | |
1349 | { | |
1350 | return 1; | |
1351 | } | |
1352 | ||
91e37a79 RR |
1353 | static inline int same_magic(const char *amagic, const char *bmagic, |
1354 | bool has_crcs) | |
1da177e4 LT |
1355 | { |
1356 | return strcmp(amagic, bmagic) == 0; | |
1357 | } | |
1358 | #endif /* CONFIG_MODVERSIONS */ | |
1359 | ||
75676500 | 1360 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1361 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1362 | const struct load_info *info, | |
414fd31b | 1363 | const char *name, |
9bea7f23 | 1364 | char ownername[]) |
1da177e4 LT |
1365 | { |
1366 | struct module *owner; | |
414fd31b | 1367 | const struct kernel_symbol *sym; |
1da177e4 | 1368 | const unsigned long *crc; |
9bea7f23 | 1369 | int err; |
1da177e4 | 1370 | |
d64810f5 PZ |
1371 | /* |
1372 | * The module_mutex should not be a heavily contended lock; | |
1373 | * if we get the occasional sleep here, we'll go an extra iteration | |
1374 | * in the wait_event_interruptible(), which is harmless. | |
1375 | */ | |
1376 | sched_annotate_sleep(); | |
75676500 | 1377 | mutex_lock(&module_mutex); |
414fd31b | 1378 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1379 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1380 | if (!sym) |
1381 | goto unlock; | |
1382 | ||
49668688 RR |
1383 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1384 | owner)) { | |
9bea7f23 RR |
1385 | sym = ERR_PTR(-EINVAL); |
1386 | goto getname; | |
1da177e4 | 1387 | } |
9bea7f23 RR |
1388 | |
1389 | err = ref_module(mod, owner); | |
1390 | if (err) { | |
1391 | sym = ERR_PTR(err); | |
1392 | goto getname; | |
1393 | } | |
1394 | ||
1395 | getname: | |
1396 | /* We must make copy under the lock if we failed to get ref. */ | |
1397 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1398 | unlock: | |
75676500 | 1399 | mutex_unlock(&module_mutex); |
218ce735 | 1400 | return sym; |
1da177e4 LT |
1401 | } |
1402 | ||
49668688 RR |
1403 | static const struct kernel_symbol * |
1404 | resolve_symbol_wait(struct module *mod, | |
1405 | const struct load_info *info, | |
1406 | const char *name) | |
9bea7f23 RR |
1407 | { |
1408 | const struct kernel_symbol *ksym; | |
49668688 | 1409 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1410 | |
1411 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1412 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1413 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1414 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1415 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1416 | mod->name, owner); | |
9bea7f23 RR |
1417 | } |
1418 | return ksym; | |
1419 | } | |
1420 | ||
1da177e4 LT |
1421 | /* |
1422 | * /sys/module/foo/sections stuff | |
1423 | * J. Corbet <corbet@lwn.net> | |
1424 | */ | |
8f6d0378 | 1425 | #ifdef CONFIG_SYSFS |
10b465aa | 1426 | |
8f6d0378 | 1427 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1428 | static inline bool sect_empty(const Elf_Shdr *sect) |
1429 | { | |
1430 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1431 | } | |
1432 | ||
6da0b565 | 1433 | struct module_sect_attr { |
a58730c4 RR |
1434 | struct module_attribute mattr; |
1435 | char *name; | |
1436 | unsigned long address; | |
1437 | }; | |
1438 | ||
6da0b565 | 1439 | struct module_sect_attrs { |
a58730c4 RR |
1440 | struct attribute_group grp; |
1441 | unsigned int nsections; | |
1442 | struct module_sect_attr attrs[0]; | |
1443 | }; | |
1444 | ||
1da177e4 | 1445 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1446 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1447 | { |
1448 | struct module_sect_attr *sattr = | |
1449 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1450 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1451 | } |
1452 | ||
04b1db9f IN |
1453 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1454 | { | |
a58730c4 | 1455 | unsigned int section; |
04b1db9f IN |
1456 | |
1457 | for (section = 0; section < sect_attrs->nsections; section++) | |
1458 | kfree(sect_attrs->attrs[section].name); | |
1459 | kfree(sect_attrs); | |
1460 | } | |
1461 | ||
8f6d0378 | 1462 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1463 | { |
1464 | unsigned int nloaded = 0, i, size[2]; | |
1465 | struct module_sect_attrs *sect_attrs; | |
1466 | struct module_sect_attr *sattr; | |
1467 | struct attribute **gattr; | |
22a8bdeb | 1468 | |
1da177e4 | 1469 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1470 | for (i = 0; i < info->hdr->e_shnum; i++) |
1471 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1472 | nloaded++; |
1473 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1474 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1475 | sizeof(sect_attrs->grp.attrs[0])); | |
1476 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1477 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1478 | if (sect_attrs == NULL) | |
1da177e4 LT |
1479 | return; |
1480 | ||
1481 | /* Setup section attributes. */ | |
1482 | sect_attrs->grp.name = "sections"; | |
1483 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1484 | ||
04b1db9f | 1485 | sect_attrs->nsections = 0; |
1da177e4 LT |
1486 | sattr = §_attrs->attrs[0]; |
1487 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1488 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1489 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1490 | if (sect_empty(sec)) | |
35dead42 | 1491 | continue; |
8f6d0378 RR |
1492 | sattr->address = sec->sh_addr; |
1493 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1494 | GFP_KERNEL); |
1495 | if (sattr->name == NULL) | |
1496 | goto out; | |
1497 | sect_attrs->nsections++; | |
361795b1 | 1498 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1499 | sattr->mattr.show = module_sect_show; |
1500 | sattr->mattr.store = NULL; | |
1501 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1502 | sattr->mattr.attr.mode = S_IRUGO; |
1503 | *(gattr++) = &(sattr++)->mattr.attr; | |
1504 | } | |
1505 | *gattr = NULL; | |
1506 | ||
1507 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1508 | goto out; | |
1509 | ||
1510 | mod->sect_attrs = sect_attrs; | |
1511 | return; | |
1512 | out: | |
04b1db9f | 1513 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1514 | } |
1515 | ||
1516 | static void remove_sect_attrs(struct module *mod) | |
1517 | { | |
1518 | if (mod->sect_attrs) { | |
1519 | sysfs_remove_group(&mod->mkobj.kobj, | |
1520 | &mod->sect_attrs->grp); | |
1521 | /* We are positive that no one is using any sect attrs | |
1522 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1523 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1524 | mod->sect_attrs = NULL; |
1525 | } | |
1526 | } | |
1527 | ||
6d760133 RM |
1528 | /* |
1529 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1530 | */ | |
1531 | ||
1532 | struct module_notes_attrs { | |
1533 | struct kobject *dir; | |
1534 | unsigned int notes; | |
1535 | struct bin_attribute attrs[0]; | |
1536 | }; | |
1537 | ||
2c3c8bea | 1538 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1539 | struct bin_attribute *bin_attr, |
1540 | char *buf, loff_t pos, size_t count) | |
1541 | { | |
1542 | /* | |
1543 | * The caller checked the pos and count against our size. | |
1544 | */ | |
1545 | memcpy(buf, bin_attr->private + pos, count); | |
1546 | return count; | |
1547 | } | |
1548 | ||
1549 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1550 | unsigned int i) | |
1551 | { | |
1552 | if (notes_attrs->dir) { | |
1553 | while (i-- > 0) | |
1554 | sysfs_remove_bin_file(notes_attrs->dir, | |
1555 | ¬es_attrs->attrs[i]); | |
e9432093 | 1556 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1557 | } |
1558 | kfree(notes_attrs); | |
1559 | } | |
1560 | ||
8f6d0378 | 1561 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1562 | { |
1563 | unsigned int notes, loaded, i; | |
1564 | struct module_notes_attrs *notes_attrs; | |
1565 | struct bin_attribute *nattr; | |
1566 | ||
ea6bff36 IM |
1567 | /* failed to create section attributes, so can't create notes */ |
1568 | if (!mod->sect_attrs) | |
1569 | return; | |
1570 | ||
6d760133 RM |
1571 | /* Count notes sections and allocate structures. */ |
1572 | notes = 0; | |
8f6d0378 RR |
1573 | for (i = 0; i < info->hdr->e_shnum; i++) |
1574 | if (!sect_empty(&info->sechdrs[i]) && | |
1575 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1576 | ++notes; |
1577 | ||
1578 | if (notes == 0) | |
1579 | return; | |
1580 | ||
1581 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1582 | + notes * sizeof(notes_attrs->attrs[0]), | |
1583 | GFP_KERNEL); | |
1584 | if (notes_attrs == NULL) | |
1585 | return; | |
1586 | ||
1587 | notes_attrs->notes = notes; | |
1588 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1589 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1590 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1591 | continue; |
8f6d0378 | 1592 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1593 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1594 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1595 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1596 | nattr->size = info->sechdrs[i].sh_size; |
1597 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1598 | nattr->read = module_notes_read; |
1599 | ++nattr; | |
1600 | } | |
1601 | ++loaded; | |
1602 | } | |
1603 | ||
4ff6abff | 1604 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1605 | if (!notes_attrs->dir) |
1606 | goto out; | |
1607 | ||
1608 | for (i = 0; i < notes; ++i) | |
1609 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1610 | ¬es_attrs->attrs[i])) | |
1611 | goto out; | |
1612 | ||
1613 | mod->notes_attrs = notes_attrs; | |
1614 | return; | |
1615 | ||
1616 | out: | |
1617 | free_notes_attrs(notes_attrs, i); | |
1618 | } | |
1619 | ||
1620 | static void remove_notes_attrs(struct module *mod) | |
1621 | { | |
1622 | if (mod->notes_attrs) | |
1623 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1624 | } | |
1625 | ||
1da177e4 | 1626 | #else |
04b1db9f | 1627 | |
8f6d0378 RR |
1628 | static inline void add_sect_attrs(struct module *mod, |
1629 | const struct load_info *info) | |
1da177e4 LT |
1630 | { |
1631 | } | |
1632 | ||
1633 | static inline void remove_sect_attrs(struct module *mod) | |
1634 | { | |
1635 | } | |
6d760133 | 1636 | |
8f6d0378 RR |
1637 | static inline void add_notes_attrs(struct module *mod, |
1638 | const struct load_info *info) | |
6d760133 RM |
1639 | { |
1640 | } | |
1641 | ||
1642 | static inline void remove_notes_attrs(struct module *mod) | |
1643 | { | |
1644 | } | |
8f6d0378 | 1645 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1646 | |
80a3d1bb RR |
1647 | static void add_usage_links(struct module *mod) |
1648 | { | |
1649 | #ifdef CONFIG_MODULE_UNLOAD | |
1650 | struct module_use *use; | |
1651 | int nowarn; | |
1652 | ||
75676500 | 1653 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1654 | list_for_each_entry(use, &mod->target_list, target_list) { |
1655 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1656 | &mod->mkobj.kobj, mod->name); | |
1657 | } | |
75676500 | 1658 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1659 | #endif |
1660 | } | |
1661 | ||
1662 | static void del_usage_links(struct module *mod) | |
1663 | { | |
1664 | #ifdef CONFIG_MODULE_UNLOAD | |
1665 | struct module_use *use; | |
1666 | ||
75676500 | 1667 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1668 | list_for_each_entry(use, &mod->target_list, target_list) |
1669 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1670 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1671 | #endif |
1672 | } | |
1673 | ||
6407ebb2 | 1674 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1675 | { |
1676 | struct module_attribute *attr; | |
03e88ae1 | 1677 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1678 | int error = 0; |
1679 | int i; | |
1680 | ||
03e88ae1 GKH |
1681 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1682 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1683 | GFP_KERNEL); | |
1684 | if (!mod->modinfo_attrs) | |
1685 | return -ENOMEM; | |
1686 | ||
1687 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1688 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1689 | if (!attr->test || | |
03e88ae1 GKH |
1690 | (attr->test && attr->test(mod))) { |
1691 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1692 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1693 | error = sysfs_create_file(&mod->mkobj.kobj, |
1694 | &temp_attr->attr); | |
03e88ae1 GKH |
1695 | ++temp_attr; |
1696 | } | |
c988d2b2 MD |
1697 | } |
1698 | return error; | |
1699 | } | |
1700 | ||
6407ebb2 | 1701 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1702 | { |
1703 | struct module_attribute *attr; | |
1704 | int i; | |
1705 | ||
03e88ae1 GKH |
1706 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1707 | /* pick a field to test for end of list */ | |
1708 | if (!attr->attr.name) | |
1709 | break; | |
6da0b565 | 1710 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1711 | if (attr->free) |
1712 | attr->free(mod); | |
c988d2b2 | 1713 | } |
03e88ae1 | 1714 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1715 | } |
1da177e4 | 1716 | |
942e4431 LZ |
1717 | static void mod_kobject_put(struct module *mod) |
1718 | { | |
1719 | DECLARE_COMPLETION_ONSTACK(c); | |
1720 | mod->mkobj.kobj_completion = &c; | |
1721 | kobject_put(&mod->mkobj.kobj); | |
1722 | wait_for_completion(&c); | |
1723 | } | |
1724 | ||
6407ebb2 | 1725 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1726 | { |
1727 | int err; | |
6494a93d | 1728 | struct kobject *kobj; |
1da177e4 | 1729 | |
823bccfc | 1730 | if (!module_sysfs_initialized) { |
bddb12b3 | 1731 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1732 | err = -EINVAL; |
1733 | goto out; | |
1734 | } | |
6494a93d GKH |
1735 | |
1736 | kobj = kset_find_obj(module_kset, mod->name); | |
1737 | if (kobj) { | |
bddb12b3 | 1738 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1739 | kobject_put(kobj); |
1740 | err = -EINVAL; | |
1741 | goto out; | |
1742 | } | |
1743 | ||
1da177e4 | 1744 | mod->mkobj.mod = mod; |
e17e0f51 | 1745 | |
ac3c8141 GKH |
1746 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1747 | mod->mkobj.kobj.kset = module_kset; | |
1748 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1749 | "%s", mod->name); | |
1750 | if (err) | |
942e4431 | 1751 | mod_kobject_put(mod); |
270a6c4c | 1752 | |
97c146ef | 1753 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1754 | out: |
1755 | return err; | |
1756 | } | |
1757 | ||
6407ebb2 | 1758 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1759 | const struct load_info *info, |
270a6c4c KS |
1760 | struct kernel_param *kparam, |
1761 | unsigned int num_params) | |
1762 | { | |
1763 | int err; | |
1764 | ||
80a3d1bb RR |
1765 | err = mod_sysfs_init(mod); |
1766 | if (err) | |
1767 | goto out; | |
1768 | ||
4ff6abff | 1769 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1770 | if (!mod->holders_dir) { |
1771 | err = -ENOMEM; | |
270a6c4c | 1772 | goto out_unreg; |
240936e1 | 1773 | } |
270a6c4c | 1774 | |
1da177e4 LT |
1775 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1776 | if (err) | |
270a6c4c | 1777 | goto out_unreg_holders; |
1da177e4 | 1778 | |
c988d2b2 MD |
1779 | err = module_add_modinfo_attrs(mod); |
1780 | if (err) | |
e17e0f51 | 1781 | goto out_unreg_param; |
c988d2b2 | 1782 | |
80a3d1bb | 1783 | add_usage_links(mod); |
8f6d0378 RR |
1784 | add_sect_attrs(mod, info); |
1785 | add_notes_attrs(mod, info); | |
80a3d1bb | 1786 | |
e17e0f51 | 1787 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1788 | return 0; |
1789 | ||
e17e0f51 KS |
1790 | out_unreg_param: |
1791 | module_param_sysfs_remove(mod); | |
270a6c4c | 1792 | out_unreg_holders: |
78a2d906 | 1793 | kobject_put(mod->holders_dir); |
270a6c4c | 1794 | out_unreg: |
942e4431 | 1795 | mod_kobject_put(mod); |
80a3d1bb | 1796 | out: |
1da177e4 LT |
1797 | return err; |
1798 | } | |
34e4e2fe DL |
1799 | |
1800 | static void mod_sysfs_fini(struct module *mod) | |
1801 | { | |
8f6d0378 RR |
1802 | remove_notes_attrs(mod); |
1803 | remove_sect_attrs(mod); | |
942e4431 | 1804 | mod_kobject_put(mod); |
34e4e2fe DL |
1805 | } |
1806 | ||
cf2fde7b RR |
1807 | static void init_param_lock(struct module *mod) |
1808 | { | |
1809 | mutex_init(&mod->param_lock); | |
1810 | } | |
8f6d0378 | 1811 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1812 | |
8f6d0378 RR |
1813 | static int mod_sysfs_setup(struct module *mod, |
1814 | const struct load_info *info, | |
6407ebb2 RR |
1815 | struct kernel_param *kparam, |
1816 | unsigned int num_params) | |
1817 | { | |
1818 | return 0; | |
1819 | } | |
1820 | ||
34e4e2fe DL |
1821 | static void mod_sysfs_fini(struct module *mod) |
1822 | { | |
1823 | } | |
1824 | ||
36b0360d RR |
1825 | static void module_remove_modinfo_attrs(struct module *mod) |
1826 | { | |
1827 | } | |
1828 | ||
80a3d1bb RR |
1829 | static void del_usage_links(struct module *mod) |
1830 | { | |
1831 | } | |
1832 | ||
cf2fde7b RR |
1833 | static void init_param_lock(struct module *mod) |
1834 | { | |
1835 | } | |
34e4e2fe | 1836 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1837 | |
36b0360d | 1838 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1839 | { |
80a3d1bb | 1840 | del_usage_links(mod); |
c988d2b2 | 1841 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1842 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1843 | kobject_put(mod->mkobj.drivers_dir); |
1844 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1845 | mod_sysfs_fini(mod); |
1da177e4 LT |
1846 | } |
1847 | ||
84e1c6bb MC |
1848 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1849 | /* | |
1850 | * LKM RO/NX protection: protect module's text/ro-data | |
1851 | * from modification and any data from execution. | |
85c898db RR |
1852 | * |
1853 | * General layout of module is: | |
1854 | * [text] [read-only-data] [writable data] | |
1855 | * text_size -----^ ^ ^ | |
1856 | * ro_size ------------------------| | | |
1857 | * size -------------------------------------------| | |
1858 | * | |
1859 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1860 | */ |
85c898db RR |
1861 | static void frob_text(const struct module_layout *layout, |
1862 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1863 | { |
85c898db RR |
1864 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1865 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1866 | set_memory((unsigned long)layout->base, | |
1867 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1868 | } |
84e1c6bb | 1869 | |
85c898db RR |
1870 | static void frob_rodata(const struct module_layout *layout, |
1871 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1872 | { |
85c898db RR |
1873 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1874 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1875 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1876 | set_memory((unsigned long)layout->base + layout->text_size, | |
1877 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1878 | } |
1879 | ||
85c898db RR |
1880 | static void frob_writable_data(const struct module_layout *layout, |
1881 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1882 | { |
85c898db RR |
1883 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1884 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1885 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); | |
1886 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1887 | (layout->size - layout->ro_size) >> PAGE_SHIFT); | |
84e1c6bb | 1888 | } |
84e1c6bb | 1889 | |
85c898db RR |
1890 | /* livepatching wants to disable read-only so it can frob module. */ |
1891 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1892 | { |
85c898db RR |
1893 | frob_text(&mod->core_layout, set_memory_rw); |
1894 | frob_rodata(&mod->core_layout, set_memory_rw); | |
1895 | frob_text(&mod->init_layout, set_memory_rw); | |
1896 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1897 | } |
84e1c6bb | 1898 | |
85c898db | 1899 | void module_enable_ro(const struct module *mod) |
01526ed0 | 1900 | { |
85c898db RR |
1901 | frob_text(&mod->core_layout, set_memory_ro); |
1902 | frob_rodata(&mod->core_layout, set_memory_ro); | |
1903 | frob_text(&mod->init_layout, set_memory_ro); | |
1904 | frob_rodata(&mod->init_layout, set_memory_ro); | |
84e1c6bb MC |
1905 | } |
1906 | ||
85c898db | 1907 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 1908 | { |
85c898db RR |
1909 | frob_rodata(&mod->core_layout, set_memory_nx); |
1910 | frob_writable_data(&mod->core_layout, set_memory_nx); | |
1911 | frob_rodata(&mod->init_layout, set_memory_nx); | |
1912 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
1913 | } |
1914 | ||
85c898db | 1915 | static void module_disable_nx(const struct module *mod) |
01526ed0 | 1916 | { |
85c898db RR |
1917 | frob_rodata(&mod->core_layout, set_memory_x); |
1918 | frob_writable_data(&mod->core_layout, set_memory_x); | |
1919 | frob_rodata(&mod->init_layout, set_memory_x); | |
1920 | frob_writable_data(&mod->init_layout, set_memory_x); | |
84e1c6bb MC |
1921 | } |
1922 | ||
1923 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1924 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
1925 | { |
1926 | struct module *mod; | |
1927 | ||
1928 | mutex_lock(&module_mutex); | |
1929 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1930 | if (mod->state == MODULE_STATE_UNFORMED) |
1931 | continue; | |
85c898db RR |
1932 | |
1933 | frob_text(&mod->core_layout, set_memory_rw); | |
1934 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb MC |
1935 | } |
1936 | mutex_unlock(&module_mutex); | |
1937 | } | |
1938 | ||
1939 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1940 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
1941 | { |
1942 | struct module *mod; | |
1943 | ||
1944 | mutex_lock(&module_mutex); | |
1945 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1946 | if (mod->state == MODULE_STATE_UNFORMED) |
1947 | continue; | |
85c898db RR |
1948 | |
1949 | frob_text(&mod->core_layout, set_memory_ro); | |
1950 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb MC |
1951 | } |
1952 | mutex_unlock(&module_mutex); | |
1953 | } | |
85c898db RR |
1954 | |
1955 | static void disable_ro_nx(const struct module_layout *layout) | |
1956 | { | |
1957 | frob_text(layout, set_memory_rw); | |
1958 | frob_rodata(layout, set_memory_rw); | |
1959 | frob_rodata(layout, set_memory_x); | |
1960 | frob_writable_data(layout, set_memory_x); | |
1961 | } | |
1962 | ||
84e1c6bb | 1963 | #else |
85c898db RR |
1964 | static void disable_ro_nx(const struct module_layout *layout) { } |
1965 | static void module_enable_nx(const struct module *mod) { } | |
1966 | static void module_disable_nx(const struct module *mod) { } | |
84e1c6bb MC |
1967 | #endif |
1968 | ||
be1f221c | 1969 | void __weak module_memfree(void *module_region) |
74e08fcf JB |
1970 | { |
1971 | vfree(module_region); | |
1972 | } | |
1973 | ||
1974 | void __weak module_arch_cleanup(struct module *mod) | |
1975 | { | |
1976 | } | |
1977 | ||
d453cded RR |
1978 | void __weak module_arch_freeing_init(struct module *mod) |
1979 | { | |
1980 | } | |
1981 | ||
75676500 | 1982 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1983 | static void free_module(struct module *mod) |
1984 | { | |
7ead8b83 LZ |
1985 | trace_module_free(mod); |
1986 | ||
36b0360d | 1987 | mod_sysfs_teardown(mod); |
1da177e4 | 1988 | |
944a1fa0 RR |
1989 | /* We leave it in list to prevent duplicate loads, but make sure |
1990 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 1991 | mutex_lock(&module_mutex); |
944a1fa0 | 1992 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 1993 | mutex_unlock(&module_mutex); |
944a1fa0 | 1994 | |
b82bab4b JB |
1995 | /* Remove dynamic debug info */ |
1996 | ddebug_remove_module(mod->name); | |
1997 | ||
1da177e4 LT |
1998 | /* Arch-specific cleanup. */ |
1999 | module_arch_cleanup(mod); | |
2000 | ||
2001 | /* Module unload stuff */ | |
2002 | module_unload_free(mod); | |
2003 | ||
e180a6b7 RR |
2004 | /* Free any allocated parameters. */ |
2005 | destroy_params(mod->kp, mod->num_kp); | |
2006 | ||
944a1fa0 RR |
2007 | /* Now we can delete it from the lists */ |
2008 | mutex_lock(&module_mutex); | |
461e34ae MH |
2009 | /* Unlink carefully: kallsyms could be walking list. */ |
2010 | list_del_rcu(&mod->list); | |
93c2e105 | 2011 | mod_tree_remove(mod); |
0286b5ea | 2012 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2013 | module_bug_cleanup(mod); |
0be964be PZ |
2014 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
2015 | synchronize_sched(); | |
944a1fa0 RR |
2016 | mutex_unlock(&module_mutex); |
2017 | ||
85c898db RR |
2018 | /* This may be empty, but that's OK */ |
2019 | disable_ro_nx(&mod->init_layout); | |
d453cded | 2020 | module_arch_freeing_init(mod); |
7523e4dc | 2021 | module_memfree(mod->init_layout.base); |
1da177e4 | 2022 | kfree(mod->args); |
259354de | 2023 | percpu_modfree(mod); |
9f85a4bb | 2024 | |
35a9393c | 2025 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2026 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2027 | |
1da177e4 | 2028 | /* Finally, free the core (containing the module structure) */ |
85c898db | 2029 | disable_ro_nx(&mod->core_layout); |
7523e4dc | 2030 | module_memfree(mod->core_layout.base); |
eb8cdec4 BS |
2031 | |
2032 | #ifdef CONFIG_MPU | |
2033 | update_protections(current->mm); | |
2034 | #endif | |
1da177e4 LT |
2035 | } |
2036 | ||
2037 | void *__symbol_get(const char *symbol) | |
2038 | { | |
2039 | struct module *owner; | |
414fd31b | 2040 | const struct kernel_symbol *sym; |
1da177e4 | 2041 | |
24da1cbf | 2042 | preempt_disable(); |
414fd31b TA |
2043 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2044 | if (sym && strong_try_module_get(owner)) | |
2045 | sym = NULL; | |
24da1cbf | 2046 | preempt_enable(); |
1da177e4 | 2047 | |
414fd31b | 2048 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
2049 | } |
2050 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2051 | ||
eea8b54d AN |
2052 | /* |
2053 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2054 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2055 | * |
2056 | * You must hold the module_mutex. | |
eea8b54d AN |
2057 | */ |
2058 | static int verify_export_symbols(struct module *mod) | |
2059 | { | |
b211104d | 2060 | unsigned int i; |
eea8b54d | 2061 | struct module *owner; |
b211104d RR |
2062 | const struct kernel_symbol *s; |
2063 | struct { | |
2064 | const struct kernel_symbol *sym; | |
2065 | unsigned int num; | |
2066 | } arr[] = { | |
2067 | { mod->syms, mod->num_syms }, | |
2068 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2069 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2070 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2071 | { mod->unused_syms, mod->num_unused_syms }, |
2072 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2073 | #endif |
b211104d | 2074 | }; |
eea8b54d | 2075 | |
b211104d RR |
2076 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2077 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 2078 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 2079 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
2080 | " (owned by %s)\n", |
2081 | mod->name, s->name, module_name(owner)); | |
2082 | return -ENOEXEC; | |
2083 | } | |
eea8b54d | 2084 | } |
b211104d RR |
2085 | } |
2086 | return 0; | |
eea8b54d AN |
2087 | } |
2088 | ||
9a4b9708 | 2089 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2090 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2091 | { | |
2092 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2093 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2094 | unsigned long secbase; |
49668688 | 2095 | unsigned int i; |
1da177e4 | 2096 | int ret = 0; |
414fd31b | 2097 | const struct kernel_symbol *ksym; |
1da177e4 | 2098 | |
49668688 RR |
2099 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2100 | const char *name = info->strtab + sym[i].st_name; | |
2101 | ||
1da177e4 LT |
2102 | switch (sym[i].st_shndx) { |
2103 | case SHN_COMMON: | |
80375980 JM |
2104 | /* Ignore common symbols */ |
2105 | if (!strncmp(name, "__gnu_lto", 9)) | |
2106 | break; | |
2107 | ||
1da177e4 LT |
2108 | /* We compiled with -fno-common. These are not |
2109 | supposed to happen. */ | |
5e124169 | 2110 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2111 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2112 | mod->name); |
2113 | ret = -ENOEXEC; | |
2114 | break; | |
2115 | ||
2116 | case SHN_ABS: | |
2117 | /* Don't need to do anything */ | |
5e124169 | 2118 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2119 | (long)sym[i].st_value); |
2120 | break; | |
2121 | ||
2122 | case SHN_UNDEF: | |
49668688 | 2123 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2124 | /* Ok if resolved. */ |
9bea7f23 | 2125 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 2126 | sym[i].st_value = ksym->value; |
1da177e4 | 2127 | break; |
414fd31b TA |
2128 | } |
2129 | ||
1da177e4 | 2130 | /* Ok if weak. */ |
9bea7f23 | 2131 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2132 | break; |
2133 | ||
bddb12b3 AM |
2134 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
2135 | mod->name, name, PTR_ERR(ksym)); | |
9bea7f23 | 2136 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
2137 | break; |
2138 | ||
2139 | default: | |
2140 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2141 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2142 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2143 | else |
49668688 | 2144 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2145 | sym[i].st_value += secbase; |
2146 | break; | |
2147 | } | |
2148 | } | |
2149 | ||
2150 | return ret; | |
2151 | } | |
2152 | ||
49668688 | 2153 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2154 | { |
2155 | unsigned int i; | |
2156 | int err = 0; | |
2157 | ||
2158 | /* Now do relocations. */ | |
49668688 RR |
2159 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2160 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2161 | |
2162 | /* Not a valid relocation section? */ | |
49668688 | 2163 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2164 | continue; |
2165 | ||
2166 | /* Don't bother with non-allocated sections */ | |
49668688 | 2167 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2168 | continue; |
2169 | ||
49668688 RR |
2170 | if (info->sechdrs[i].sh_type == SHT_REL) |
2171 | err = apply_relocate(info->sechdrs, info->strtab, | |
2172 | info->index.sym, i, mod); | |
2173 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2174 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2175 | info->index.sym, i, mod); | |
22e268eb RR |
2176 | if (err < 0) |
2177 | break; | |
2178 | } | |
2179 | return err; | |
2180 | } | |
2181 | ||
088af9a6 HD |
2182 | /* Additional bytes needed by arch in front of individual sections */ |
2183 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2184 | unsigned int section) | |
2185 | { | |
2186 | /* default implementation just returns zero */ | |
2187 | return 0; | |
2188 | } | |
2189 | ||
1da177e4 | 2190 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2191 | static long get_offset(struct module *mod, unsigned int *size, |
2192 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2193 | { |
2194 | long ret; | |
2195 | ||
088af9a6 | 2196 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2197 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2198 | *size = ret + sechdr->sh_size; | |
2199 | return ret; | |
2200 | } | |
2201 | ||
2202 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2203 | might -- code, read-only data, read-write data, small data. Tally | |
2204 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2205 | belongs in init. */ | |
49668688 | 2206 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2207 | { |
2208 | static unsigned long const masks[][2] = { | |
2209 | /* NOTE: all executable code must be the first section | |
2210 | * in this array; otherwise modify the text_size | |
2211 | * finder in the two loops below */ | |
2212 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2213 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
2214 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2215 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2216 | }; | |
2217 | unsigned int m, i; | |
2218 | ||
49668688 RR |
2219 | for (i = 0; i < info->hdr->e_shnum; i++) |
2220 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2221 | |
5e124169 | 2222 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2223 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2224 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2225 | Elf_Shdr *s = &info->sechdrs[i]; | |
2226 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2227 | |
2228 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2229 | || (s->sh_flags & masks[m][1]) | |
2230 | || s->sh_entsize != ~0UL | |
49668688 | 2231 | || strstarts(sname, ".init")) |
1da177e4 | 2232 | continue; |
7523e4dc | 2233 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2234 | pr_debug("\t%s\n", sname); |
1da177e4 | 2235 | } |
84e1c6bb MC |
2236 | switch (m) { |
2237 | case 0: /* executable */ | |
7523e4dc RR |
2238 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2239 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2240 | break; |
2241 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2242 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2243 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb MC |
2244 | break; |
2245 | case 3: /* whole core */ | |
7523e4dc | 2246 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2247 | break; |
2248 | } | |
1da177e4 LT |
2249 | } |
2250 | ||
5e124169 | 2251 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2252 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2253 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2254 | Elf_Shdr *s = &info->sechdrs[i]; | |
2255 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2256 | |
2257 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2258 | || (s->sh_flags & masks[m][1]) | |
2259 | || s->sh_entsize != ~0UL | |
49668688 | 2260 | || !strstarts(sname, ".init")) |
1da177e4 | 2261 | continue; |
7523e4dc | 2262 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2263 | | INIT_OFFSET_MASK); |
5e124169 | 2264 | pr_debug("\t%s\n", sname); |
1da177e4 | 2265 | } |
84e1c6bb MC |
2266 | switch (m) { |
2267 | case 0: /* executable */ | |
7523e4dc RR |
2268 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2269 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2270 | break; |
2271 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2272 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2273 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb MC |
2274 | break; |
2275 | case 3: /* whole init */ | |
7523e4dc | 2276 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2277 | break; |
2278 | } | |
1da177e4 LT |
2279 | } |
2280 | } | |
2281 | ||
1da177e4 LT |
2282 | static void set_license(struct module *mod, const char *license) |
2283 | { | |
2284 | if (!license) | |
2285 | license = "unspecified"; | |
2286 | ||
fa3ba2e8 | 2287 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2288 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2289 | pr_warn("%s: module license '%s' taints kernel.\n", |
2290 | mod->name, license); | |
373d4d09 RR |
2291 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2292 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2293 | } |
2294 | } | |
2295 | ||
2296 | /* Parse tag=value strings from .modinfo section */ | |
2297 | static char *next_string(char *string, unsigned long *secsize) | |
2298 | { | |
2299 | /* Skip non-zero chars */ | |
2300 | while (string[0]) { | |
2301 | string++; | |
2302 | if ((*secsize)-- <= 1) | |
2303 | return NULL; | |
2304 | } | |
2305 | ||
2306 | /* Skip any zero padding. */ | |
2307 | while (!string[0]) { | |
2308 | string++; | |
2309 | if ((*secsize)-- <= 1) | |
2310 | return NULL; | |
2311 | } | |
2312 | return string; | |
2313 | } | |
2314 | ||
49668688 | 2315 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2316 | { |
2317 | char *p; | |
2318 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2319 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2320 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2321 | |
49668688 | 2322 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2323 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2324 | return p + taglen + 1; | |
2325 | } | |
2326 | return NULL; | |
2327 | } | |
2328 | ||
49668688 | 2329 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2330 | { |
2331 | struct module_attribute *attr; | |
2332 | int i; | |
2333 | ||
2334 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2335 | if (attr->setup) | |
49668688 | 2336 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2337 | } |
2338 | } | |
c988d2b2 | 2339 | |
a263f776 RR |
2340 | static void free_modinfo(struct module *mod) |
2341 | { | |
2342 | struct module_attribute *attr; | |
2343 | int i; | |
2344 | ||
2345 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2346 | if (attr->free) | |
2347 | attr->free(mod); | |
2348 | } | |
2349 | } | |
2350 | ||
1da177e4 | 2351 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2352 | |
2353 | /* lookup symbol in given range of kernel_symbols */ | |
2354 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2355 | const struct kernel_symbol *start, | |
2356 | const struct kernel_symbol *stop) | |
2357 | { | |
9d63487f AIB |
2358 | return bsearch(name, start, stop - start, |
2359 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2360 | } |
2361 | ||
ca4787b7 TA |
2362 | static int is_exported(const char *name, unsigned long value, |
2363 | const struct module *mod) | |
1da177e4 | 2364 | { |
ca4787b7 TA |
2365 | const struct kernel_symbol *ks; |
2366 | if (!mod) | |
2367 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2368 | else |
ca4787b7 TA |
2369 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2370 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2371 | } |
2372 | ||
2373 | /* As per nm */ | |
eded41c1 | 2374 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2375 | { |
eded41c1 RR |
2376 | const Elf_Shdr *sechdrs = info->sechdrs; |
2377 | ||
1da177e4 LT |
2378 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2379 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2380 | return 'v'; | |
2381 | else | |
2382 | return 'w'; | |
2383 | } | |
2384 | if (sym->st_shndx == SHN_UNDEF) | |
2385 | return 'U'; | |
e0224418 | 2386 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2387 | return 'a'; |
2388 | if (sym->st_shndx >= SHN_LORESERVE) | |
2389 | return '?'; | |
2390 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2391 | return 't'; | |
2392 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2393 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2394 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2395 | return 'r'; | |
2396 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2397 | return 'g'; | |
2398 | else | |
2399 | return 'd'; | |
2400 | } | |
2401 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2402 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2403 | return 's'; | |
2404 | else | |
2405 | return 'b'; | |
2406 | } | |
eded41c1 RR |
2407 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2408 | ".debug")) { | |
1da177e4 | 2409 | return 'n'; |
eded41c1 | 2410 | } |
1da177e4 LT |
2411 | return '?'; |
2412 | } | |
2413 | ||
4a496226 | 2414 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2415 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2416 | { |
2417 | const Elf_Shdr *sec; | |
2418 | ||
2419 | if (src->st_shndx == SHN_UNDEF | |
2420 | || src->st_shndx >= shnum | |
2421 | || !src->st_name) | |
2422 | return false; | |
2423 | ||
e0224418 MB |
2424 | #ifdef CONFIG_KALLSYMS_ALL |
2425 | if (src->st_shndx == pcpundx) | |
2426 | return true; | |
2427 | #endif | |
2428 | ||
4a496226 JB |
2429 | sec = sechdrs + src->st_shndx; |
2430 | if (!(sec->sh_flags & SHF_ALLOC) | |
2431 | #ifndef CONFIG_KALLSYMS_ALL | |
2432 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2433 | #endif | |
2434 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2435 | return false; | |
2436 | ||
2437 | return true; | |
2438 | } | |
2439 | ||
48fd1188 KC |
2440 | /* |
2441 | * We only allocate and copy the strings needed by the parts of symtab | |
2442 | * we keep. This is simple, but has the effect of making multiple | |
2443 | * copies of duplicates. We could be more sophisticated, see | |
2444 | * linux-kernel thread starting with | |
2445 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2446 | */ | |
49668688 | 2447 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2448 | { |
49668688 RR |
2449 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2450 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2451 | const Elf_Sym *src; |
54523ec7 | 2452 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2453 | |
2454 | /* Put symbol section at end of init part of module. */ | |
2455 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2456 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2457 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2458 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2459 | |
49668688 | 2460 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2461 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2462 | |
48fd1188 | 2463 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 RR |
2464 | for (ndst = i = 0; i < nsrc; i++) { |
2465 | if (i == 0 || | |
e0224418 MB |
2466 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2467 | info->index.pcpu)) { | |
59ef28b1 | 2468 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2469 | ndst++; |
554bdfe5 | 2470 | } |
59ef28b1 | 2471 | } |
4a496226 JB |
2472 | |
2473 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2474 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2475 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2476 | mod->core_layout.size += strtab_size; | |
2477 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
4a496226 | 2478 | |
554bdfe5 JB |
2479 | /* Put string table section at end of init part of module. */ |
2480 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2481 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2482 | info->index.str) | INIT_OFFSET_MASK; |
7523e4dc | 2483 | mod->init_layout.size = debug_align(mod->init_layout.size); |
5e124169 | 2484 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
4a496226 JB |
2485 | } |
2486 | ||
811d66a0 | 2487 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2488 | { |
4a496226 JB |
2489 | unsigned int i, ndst; |
2490 | const Elf_Sym *src; | |
2491 | Elf_Sym *dst; | |
554bdfe5 | 2492 | char *s; |
eded41c1 | 2493 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2494 | |
eded41c1 RR |
2495 | mod->symtab = (void *)symsec->sh_addr; |
2496 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae RR |
2497 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2498 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2499 | |
2500 | /* Set types up while we still have access to sections. */ | |
2501 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2502 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2503 | |
7523e4dc RR |
2504 | mod->core_symtab = dst = mod->core_layout.base + info->symoffs; |
2505 | mod->core_strtab = s = mod->core_layout.base + info->stroffs; | |
4a496226 | 2506 | src = mod->symtab; |
59ef28b1 RR |
2507 | for (ndst = i = 0; i < mod->num_symtab; i++) { |
2508 | if (i == 0 || | |
e0224418 MB |
2509 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2510 | info->index.pcpu)) { | |
59ef28b1 RR |
2511 | dst[ndst] = src[i]; |
2512 | dst[ndst++].st_name = s - mod->core_strtab; | |
2513 | s += strlcpy(s, &mod->strtab[src[i].st_name], | |
2514 | KSYM_NAME_LEN) + 1; | |
2515 | } | |
4a496226 JB |
2516 | } |
2517 | mod->core_num_syms = ndst; | |
1da177e4 LT |
2518 | } |
2519 | #else | |
49668688 | 2520 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2521 | { |
2522 | } | |
3ae91c21 | 2523 | |
abbce906 | 2524 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2525 | { |
2526 | } | |
2527 | #endif /* CONFIG_KALLSYMS */ | |
2528 | ||
e9d376f0 | 2529 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2530 | { |
811d66a0 RR |
2531 | if (!debug) |
2532 | return; | |
e9d376f0 JB |
2533 | #ifdef CONFIG_DYNAMIC_DEBUG |
2534 | if (ddebug_add_module(debug, num, debug->modname)) | |
bddb12b3 AM |
2535 | pr_err("dynamic debug error adding module: %s\n", |
2536 | debug->modname); | |
e9d376f0 | 2537 | #endif |
5e458cc0 | 2538 | } |
346e15be | 2539 | |
ff49d74a YS |
2540 | static void dynamic_debug_remove(struct _ddebug *debug) |
2541 | { | |
2542 | if (debug) | |
2543 | ddebug_remove_module(debug->modname); | |
2544 | } | |
2545 | ||
74e08fcf JB |
2546 | void * __weak module_alloc(unsigned long size) |
2547 | { | |
82fab442 | 2548 | return vmalloc_exec(size); |
74e08fcf JB |
2549 | } |
2550 | ||
4f2294b6 | 2551 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2552 | static void kmemleak_load_module(const struct module *mod, |
2553 | const struct load_info *info) | |
4f2294b6 CM |
2554 | { |
2555 | unsigned int i; | |
2556 | ||
2557 | /* only scan the sections containing data */ | |
c017b4be | 2558 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2559 | |
49668688 | 2560 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2561 | /* Scan all writable sections that's not executable */ |
2562 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2563 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2564 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2565 | continue; |
2566 | ||
49668688 RR |
2567 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2568 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2569 | } |
2570 | } | |
2571 | #else | |
49668688 RR |
2572 | static inline void kmemleak_load_module(const struct module *mod, |
2573 | const struct load_info *info) | |
4f2294b6 CM |
2574 | { |
2575 | } | |
2576 | #endif | |
2577 | ||
106a4ee2 | 2578 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2579 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2580 | { |
2581 | int err = -ENOKEY; | |
34e1169d KC |
2582 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2583 | const void *mod = info->hdr; | |
caabe240 | 2584 | |
34e1169d KC |
2585 | if (info->len > markerlen && |
2586 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { | |
caabe240 | 2587 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2588 | info->len -= markerlen; |
2589 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2590 | } |
2591 | ||
2592 | if (!err) { | |
2593 | info->sig_ok = true; | |
2594 | return 0; | |
2595 | } | |
2596 | ||
2597 | /* Not having a signature is only an error if we're strict. */ | |
2598 | if (err == -ENOKEY && !sig_enforce) | |
2599 | err = 0; | |
2600 | ||
2601 | return err; | |
2602 | } | |
2603 | #else /* !CONFIG_MODULE_SIG */ | |
34e1169d | 2604 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2605 | { |
2606 | return 0; | |
2607 | } | |
2608 | #endif /* !CONFIG_MODULE_SIG */ | |
2609 | ||
34e1169d KC |
2610 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2611 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2612 | { |
34e1169d KC |
2613 | if (info->len < sizeof(*(info->hdr))) |
2614 | return -ENOEXEC; | |
2615 | ||
2616 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2617 | || info->hdr->e_type != ET_REL | |
2618 | || !elf_check_arch(info->hdr) | |
2619 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2620 | return -ENOEXEC; | |
2621 | ||
2622 | if (info->hdr->e_shoff >= info->len | |
2623 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2624 | info->len - info->hdr->e_shoff)) | |
2625 | return -ENOEXEC; | |
40dd2560 | 2626 | |
34e1169d KC |
2627 | return 0; |
2628 | } | |
2629 | ||
3afe9f84 LT |
2630 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2631 | ||
2632 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2633 | { | |
2634 | do { | |
2635 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2636 | ||
2637 | if (copy_from_user(dst, usrc, n) != 0) | |
2638 | return -EFAULT; | |
2639 | cond_resched(); | |
2640 | dst += n; | |
2641 | usrc += n; | |
2642 | len -= n; | |
2643 | } while (len); | |
2644 | return 0; | |
2645 | } | |
2646 | ||
34e1169d KC |
2647 | /* Sets info->hdr and info->len. */ |
2648 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2649 | struct load_info *info) | |
40dd2560 RR |
2650 | { |
2651 | int err; | |
40dd2560 | 2652 | |
34e1169d KC |
2653 | info->len = len; |
2654 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2655 | return -ENOEXEC; |
2656 | ||
2e72d51b KC |
2657 | err = security_kernel_module_from_file(NULL); |
2658 | if (err) | |
2659 | return err; | |
2660 | ||
40dd2560 | 2661 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d KS |
2662 | info->hdr = __vmalloc(info->len, |
2663 | GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN, PAGE_KERNEL); | |
34e1169d | 2664 | if (!info->hdr) |
40dd2560 RR |
2665 | return -ENOMEM; |
2666 | ||
3afe9f84 | 2667 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2668 | vfree(info->hdr); |
2669 | return -EFAULT; | |
40dd2560 RR |
2670 | } |
2671 | ||
34e1169d KC |
2672 | return 0; |
2673 | } | |
2674 | ||
2675 | /* Sets info->hdr and info->len. */ | |
2676 | static int copy_module_from_fd(int fd, struct load_info *info) | |
2677 | { | |
a2e0578b | 2678 | struct fd f = fdget(fd); |
34e1169d KC |
2679 | int err; |
2680 | struct kstat stat; | |
2681 | loff_t pos; | |
2682 | ssize_t bytes = 0; | |
2683 | ||
a2e0578b | 2684 | if (!f.file) |
34e1169d KC |
2685 | return -ENOEXEC; |
2686 | ||
a2e0578b | 2687 | err = security_kernel_module_from_file(f.file); |
106a4ee2 | 2688 | if (err) |
2e72d51b | 2689 | goto out; |
106a4ee2 | 2690 | |
a2e0578b | 2691 | err = vfs_getattr(&f.file->f_path, &stat); |
106a4ee2 | 2692 | if (err) |
34e1169d | 2693 | goto out; |
40dd2560 | 2694 | |
34e1169d KC |
2695 | if (stat.size > INT_MAX) { |
2696 | err = -EFBIG; | |
2697 | goto out; | |
40dd2560 | 2698 | } |
52441fa8 SL |
2699 | |
2700 | /* Don't hand 0 to vmalloc, it whines. */ | |
2701 | if (stat.size == 0) { | |
2702 | err = -EINVAL; | |
2703 | goto out; | |
2704 | } | |
2705 | ||
34e1169d KC |
2706 | info->hdr = vmalloc(stat.size); |
2707 | if (!info->hdr) { | |
2708 | err = -ENOMEM; | |
2709 | goto out; | |
40dd2560 | 2710 | } |
d913188c | 2711 | |
34e1169d KC |
2712 | pos = 0; |
2713 | while (pos < stat.size) { | |
a2e0578b | 2714 | bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos, |
34e1169d KC |
2715 | stat.size - pos); |
2716 | if (bytes < 0) { | |
2717 | vfree(info->hdr); | |
2718 | err = bytes; | |
2719 | goto out; | |
2720 | } | |
2721 | if (bytes == 0) | |
2722 | break; | |
2723 | pos += bytes; | |
2724 | } | |
2725 | info->len = pos; | |
40dd2560 | 2726 | |
34e1169d | 2727 | out: |
a2e0578b | 2728 | fdput(f); |
40dd2560 RR |
2729 | return err; |
2730 | } | |
2731 | ||
d913188c RR |
2732 | static void free_copy(struct load_info *info) |
2733 | { | |
d913188c RR |
2734 | vfree(info->hdr); |
2735 | } | |
2736 | ||
2f3238ae | 2737 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2738 | { |
2739 | unsigned int i; | |
2740 | ||
2741 | /* This should always be true, but let's be sure. */ | |
2742 | info->sechdrs[0].sh_addr = 0; | |
2743 | ||
2744 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2745 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2746 | if (shdr->sh_type != SHT_NOBITS | |
2747 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2748 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2749 | return -ENOEXEC; |
2750 | } | |
2751 | ||
2752 | /* Mark all sections sh_addr with their address in the | |
2753 | temporary image. */ | |
2754 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2755 | ||
2756 | #ifndef CONFIG_MODULE_UNLOAD | |
2757 | /* Don't load .exit sections */ | |
2758 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2759 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2760 | #endif | |
8b5f61a7 | 2761 | } |
d6df72a0 RR |
2762 | |
2763 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2764 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2765 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2766 | else | |
2767 | info->index.vers = find_sec(info, "__versions"); | |
49668688 | 2768 | info->index.info = find_sec(info, ".modinfo"); |
d6df72a0 RR |
2769 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2770 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2771 | return 0; |
2772 | } | |
2773 | ||
3264d3f9 LT |
2774 | /* |
2775 | * Set up our basic convenience variables (pointers to section headers, | |
2776 | * search for module section index etc), and do some basic section | |
2777 | * verification. | |
2778 | * | |
2779 | * Return the temporary module pointer (we'll replace it with the final | |
2780 | * one when we move the module sections around). | |
2781 | */ | |
2f3238ae | 2782 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2783 | { |
2784 | unsigned int i; | |
8b5f61a7 | 2785 | int err; |
3264d3f9 LT |
2786 | struct module *mod; |
2787 | ||
2788 | /* Set up the convenience variables */ | |
2789 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2790 | info->secstrings = (void *)info->hdr |
2791 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2792 | |
2f3238ae | 2793 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2794 | if (err) |
2795 | return ERR_PTR(err); | |
3264d3f9 | 2796 | |
8b5f61a7 RR |
2797 | /* Find internal symbols and strings. */ |
2798 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2799 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2800 | info->index.sym = i; | |
2801 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2802 | info->strtab = (char *)info->hdr |
2803 | + info->sechdrs[info->index.str].sh_offset; | |
2804 | break; | |
3264d3f9 | 2805 | } |
3264d3f9 LT |
2806 | } |
2807 | ||
49668688 | 2808 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2809 | if (!info->index.mod) { |
bddb12b3 | 2810 | pr_warn("No module found in object\n"); |
3264d3f9 LT |
2811 | return ERR_PTR(-ENOEXEC); |
2812 | } | |
2813 | /* This is temporary: point mod into copy of data. */ | |
2814 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2815 | ||
2816 | if (info->index.sym == 0) { | |
bddb12b3 | 2817 | pr_warn("%s: module has no symbols (stripped?)\n", mod->name); |
3264d3f9 LT |
2818 | return ERR_PTR(-ENOEXEC); |
2819 | } | |
2820 | ||
49668688 | 2821 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2822 | |
3264d3f9 LT |
2823 | /* Check module struct version now, before we try to use module. */ |
2824 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2825 | return ERR_PTR(-ENOEXEC); | |
2826 | ||
2827 | return mod; | |
3264d3f9 LT |
2828 | } |
2829 | ||
2f3238ae | 2830 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2831 | { |
49668688 | 2832 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2833 | int err; |
2834 | ||
2f3238ae RR |
2835 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2836 | modmagic = NULL; | |
2837 | ||
40dd2560 RR |
2838 | /* This is allowed: modprobe --force will invalidate it. */ |
2839 | if (!modmagic) { | |
2840 | err = try_to_force_load(mod, "bad vermagic"); | |
2841 | if (err) | |
2842 | return err; | |
49668688 | 2843 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 2844 | pr_err("%s: version magic '%s' should be '%s'\n", |
40dd2560 RR |
2845 | mod->name, modmagic, vermagic); |
2846 | return -ENOEXEC; | |
2847 | } | |
2848 | ||
2449b8ba | 2849 | if (!get_modinfo(info, "intree")) |
373d4d09 | 2850 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
2449b8ba | 2851 | |
49668688 | 2852 | if (get_modinfo(info, "staging")) { |
373d4d09 | 2853 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
2854 | pr_warn("%s: module is from the staging directory, the quality " |
2855 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 2856 | } |
22e268eb RR |
2857 | |
2858 | /* Set up license info based on the info section */ | |
49668688 | 2859 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2860 | |
40dd2560 RR |
2861 | return 0; |
2862 | } | |
2863 | ||
eb3057df | 2864 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2865 | { |
49668688 | 2866 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2867 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2868 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2869 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2870 | mod->crcs = section_addr(info, "__kcrctab"); |
2871 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2872 | sizeof(*mod->gpl_syms), |
2873 | &mod->num_gpl_syms); | |
49668688 RR |
2874 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2875 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2876 | "__ksymtab_gpl_future", |
2877 | sizeof(*mod->gpl_future_syms), | |
2878 | &mod->num_gpl_future_syms); | |
49668688 | 2879 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2880 | |
2881 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2882 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2883 | sizeof(*mod->unused_syms), |
2884 | &mod->num_unused_syms); | |
49668688 RR |
2885 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2886 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2887 | sizeof(*mod->unused_gpl_syms), |
2888 | &mod->num_unused_gpl_syms); | |
49668688 | 2889 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2890 | #endif |
2891 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2892 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 2893 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
2894 | if (!mod->ctors) |
2895 | mod->ctors = section_objs(info, ".init_array", | |
2896 | sizeof(*mod->ctors), &mod->num_ctors); | |
2897 | else if (find_sec(info, ".init_array")) { | |
2898 | /* | |
2899 | * This shouldn't happen with same compiler and binutils | |
2900 | * building all parts of the module. | |
2901 | */ | |
6da0b565 | 2902 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
2903 | mod->name); |
2904 | return -EINVAL; | |
2905 | } | |
f91a13bb LT |
2906 | #endif |
2907 | ||
2908 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2909 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2910 | sizeof(*mod->tracepoints_ptrs), | |
2911 | &mod->num_tracepoints); | |
f91a13bb | 2912 | #endif |
bf5438fc JB |
2913 | #ifdef HAVE_JUMP_LABEL |
2914 | mod->jump_entries = section_objs(info, "__jump_table", | |
2915 | sizeof(*mod->jump_entries), | |
2916 | &mod->num_jump_entries); | |
2917 | #endif | |
f91a13bb | 2918 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2919 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2920 | sizeof(*mod->trace_events), |
2921 | &mod->num_trace_events); | |
3673b8e4 SRRH |
2922 | mod->trace_enums = section_objs(info, "_ftrace_enum_map", |
2923 | sizeof(*mod->trace_enums), | |
2924 | &mod->num_trace_enums); | |
f91a13bb | 2925 | #endif |
13b9b6e7 SR |
2926 | #ifdef CONFIG_TRACING |
2927 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2928 | sizeof(*mod->trace_bprintk_fmt_start), | |
2929 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 2930 | #endif |
f91a13bb LT |
2931 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2932 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2933 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2934 | sizeof(*mod->ftrace_callsites), |
2935 | &mod->num_ftrace_callsites); | |
2936 | #endif | |
22e268eb | 2937 | |
811d66a0 RR |
2938 | mod->extable = section_objs(info, "__ex_table", |
2939 | sizeof(*mod->extable), &mod->num_exentries); | |
2940 | ||
49668688 | 2941 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 2942 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
2943 | |
2944 | info->debug = section_objs(info, "__verbose", | |
2945 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
2946 | |
2947 | return 0; | |
f91a13bb LT |
2948 | } |
2949 | ||
49668688 | 2950 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2951 | { |
2952 | int i; | |
2953 | void *ptr; | |
2954 | ||
2955 | /* Do the allocs. */ | |
7523e4dc | 2956 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
2957 | /* |
2958 | * The pointer to this block is stored in the module structure | |
2959 | * which is inside the block. Just mark it as not being a | |
2960 | * leak. | |
2961 | */ | |
2962 | kmemleak_not_leak(ptr); | |
2963 | if (!ptr) | |
d913188c | 2964 | return -ENOMEM; |
65b8a9b4 | 2965 | |
7523e4dc RR |
2966 | memset(ptr, 0, mod->core_layout.size); |
2967 | mod->core_layout.base = ptr; | |
65b8a9b4 | 2968 | |
7523e4dc RR |
2969 | if (mod->init_layout.size) { |
2970 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
2971 | /* |
2972 | * The pointer to this block is stored in the module structure | |
2973 | * which is inside the block. This block doesn't need to be | |
2974 | * scanned as it contains data and code that will be freed | |
2975 | * after the module is initialized. | |
2976 | */ | |
2977 | kmemleak_ignore(ptr); | |
2978 | if (!ptr) { | |
7523e4dc | 2979 | module_memfree(mod->core_layout.base); |
82fab442 RR |
2980 | return -ENOMEM; |
2981 | } | |
7523e4dc RR |
2982 | memset(ptr, 0, mod->init_layout.size); |
2983 | mod->init_layout.base = ptr; | |
82fab442 | 2984 | } else |
7523e4dc | 2985 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
2986 | |
2987 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 2988 | pr_debug("final section addresses:\n"); |
49668688 | 2989 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2990 | void *dest; |
49668688 | 2991 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2992 | |
49668688 | 2993 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2994 | continue; |
2995 | ||
49668688 | 2996 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 2997 | dest = mod->init_layout.base |
49668688 | 2998 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 2999 | else |
7523e4dc | 3000 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3001 | |
49668688 RR |
3002 | if (shdr->sh_type != SHT_NOBITS) |
3003 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3004 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3005 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3006 | pr_debug("\t0x%lx %s\n", |
3007 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3008 | } |
d913188c RR |
3009 | |
3010 | return 0; | |
65b8a9b4 LT |
3011 | } |
3012 | ||
49668688 | 3013 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
3014 | { |
3015 | /* | |
3016 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3017 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3018 | * using GPL-only symbols it needs. | |
3019 | */ | |
3020 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3021 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3022 | |
3023 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3024 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3025 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3026 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3027 | |
c99af375 MG |
3028 | /* lve claims to be GPL but upstream won't provide source */ |
3029 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3030 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3031 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3032 | |
22e268eb RR |
3033 | #ifdef CONFIG_MODVERSIONS |
3034 | if ((mod->num_syms && !mod->crcs) | |
3035 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3036 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3037 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3038 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3039 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3040 | #endif | |
3041 | ) { | |
3042 | return try_to_force_load(mod, | |
3043 | "no versions for exported symbols"); | |
3044 | } | |
3045 | #endif | |
3046 | return 0; | |
3047 | } | |
3048 | ||
3049 | static void flush_module_icache(const struct module *mod) | |
3050 | { | |
3051 | mm_segment_t old_fs; | |
3052 | ||
3053 | /* flush the icache in correct context */ | |
3054 | old_fs = get_fs(); | |
3055 | set_fs(KERNEL_DS); | |
3056 | ||
3057 | /* | |
3058 | * Flush the instruction cache, since we've played with text. | |
3059 | * Do it before processing of module parameters, so the module | |
3060 | * can provide parameter accessor functions of its own. | |
3061 | */ | |
7523e4dc RR |
3062 | if (mod->init_layout.base) |
3063 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3064 | (unsigned long)mod->init_layout.base | |
3065 | + mod->init_layout.size); | |
3066 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3067 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3068 | |
3069 | set_fs(old_fs); | |
3070 | } | |
3071 | ||
74e08fcf JB |
3072 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3073 | Elf_Shdr *sechdrs, | |
3074 | char *secstrings, | |
3075 | struct module *mod) | |
3076 | { | |
3077 | return 0; | |
3078 | } | |
3079 | ||
2f3238ae | 3080 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3081 | { |
d913188c | 3082 | /* Module within temporary copy. */ |
1da177e4 | 3083 | struct module *mod; |
d913188c | 3084 | int err; |
3ae91c21 | 3085 | |
2f3238ae | 3086 | mod = setup_load_info(info, flags); |
d913188c RR |
3087 | if (IS_ERR(mod)) |
3088 | return mod; | |
1da177e4 | 3089 | |
2f3238ae | 3090 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
3091 | if (err) |
3092 | return ERR_PTR(err); | |
1da177e4 | 3093 | |
1da177e4 | 3094 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
3095 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
3096 | info->secstrings, mod); | |
1da177e4 | 3097 | if (err < 0) |
8d8022e8 | 3098 | return ERR_PTR(err); |
1da177e4 | 3099 | |
8d8022e8 RR |
3100 | /* We will do a special allocation for per-cpu sections later. */ |
3101 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 LT |
3102 | |
3103 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
3104 | this is done generically; there doesn't appear to be any | |
3105 | special cases for the architectures. */ | |
49668688 | 3106 | layout_sections(mod, info); |
49668688 | 3107 | layout_symtab(mod, info); |
1da177e4 | 3108 | |
65b8a9b4 | 3109 | /* Allocate and move to the final place */ |
49668688 | 3110 | err = move_module(mod, info); |
d913188c | 3111 | if (err) |
8d8022e8 | 3112 | return ERR_PTR(err); |
d913188c RR |
3113 | |
3114 | /* Module has been copied to its final place now: return it. */ | |
3115 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3116 | kmemleak_load_module(mod, info); |
d913188c | 3117 | return mod; |
d913188c RR |
3118 | } |
3119 | ||
3120 | /* mod is no longer valid after this! */ | |
3121 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3122 | { | |
d913188c | 3123 | percpu_modfree(mod); |
d453cded | 3124 | module_arch_freeing_init(mod); |
7523e4dc RR |
3125 | module_memfree(mod->init_layout.base); |
3126 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3127 | } |
3128 | ||
74e08fcf JB |
3129 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3130 | const Elf_Shdr *sechdrs, | |
3131 | struct module *me) | |
3132 | { | |
3133 | return 0; | |
3134 | } | |
3135 | ||
811d66a0 RR |
3136 | static int post_relocation(struct module *mod, const struct load_info *info) |
3137 | { | |
51f3d0f4 | 3138 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3139 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3140 | ||
3141 | /* Copy relocated percpu area over. */ | |
3142 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3143 | info->sechdrs[info->index.pcpu].sh_size); | |
3144 | ||
51f3d0f4 | 3145 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3146 | add_kallsyms(mod, info); |
3147 | ||
3148 | /* Arch-specific module finalizing. */ | |
3149 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3150 | } | |
3151 | ||
9bb9c3be RR |
3152 | /* Is this module of this name done loading? No locks held. */ |
3153 | static bool finished_loading(const char *name) | |
3154 | { | |
3155 | struct module *mod; | |
3156 | bool ret; | |
3157 | ||
9cc019b8 PZ |
3158 | /* |
3159 | * The module_mutex should not be a heavily contended lock; | |
3160 | * if we get the occasional sleep here, we'll go an extra iteration | |
3161 | * in the wait_event_interruptible(), which is harmless. | |
3162 | */ | |
3163 | sched_annotate_sleep(); | |
9bb9c3be | 3164 | mutex_lock(&module_mutex); |
4f6de4d5 | 3165 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3166 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3167 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3168 | mutex_unlock(&module_mutex); |
3169 | ||
3170 | return ret; | |
3171 | } | |
3172 | ||
34e1169d KC |
3173 | /* Call module constructors. */ |
3174 | static void do_mod_ctors(struct module *mod) | |
3175 | { | |
3176 | #ifdef CONFIG_CONSTRUCTORS | |
3177 | unsigned long i; | |
3178 | ||
3179 | for (i = 0; i < mod->num_ctors; i++) | |
3180 | mod->ctors[i](); | |
3181 | #endif | |
3182 | } | |
3183 | ||
c7496379 RR |
3184 | /* For freeing module_init on success, in case kallsyms traversing */ |
3185 | struct mod_initfree { | |
3186 | struct rcu_head rcu; | |
3187 | void *module_init; | |
3188 | }; | |
3189 | ||
3190 | static void do_free_init(struct rcu_head *head) | |
3191 | { | |
3192 | struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); | |
3193 | module_memfree(m->module_init); | |
3194 | kfree(m); | |
3195 | } | |
3196 | ||
be02a186 JK |
3197 | /* |
3198 | * This is where the real work happens. | |
3199 | * | |
3200 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3201 | * helper command 'lx-symbols'. | |
3202 | */ | |
3203 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3204 | { |
3205 | int ret = 0; | |
c7496379 RR |
3206 | struct mod_initfree *freeinit; |
3207 | ||
3208 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3209 | if (!freeinit) { | |
3210 | ret = -ENOMEM; | |
3211 | goto fail; | |
3212 | } | |
7523e4dc | 3213 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3214 | |
774a1221 TH |
3215 | /* |
3216 | * We want to find out whether @mod uses async during init. Clear | |
3217 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3218 | */ | |
3219 | current->flags &= ~PF_USED_ASYNC; | |
3220 | ||
34e1169d KC |
3221 | do_mod_ctors(mod); |
3222 | /* Start the module */ | |
3223 | if (mod->init != NULL) | |
3224 | ret = do_one_initcall(mod->init); | |
3225 | if (ret < 0) { | |
c7496379 | 3226 | goto fail_free_freeinit; |
34e1169d KC |
3227 | } |
3228 | if (ret > 0) { | |
bddb12b3 AM |
3229 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3230 | "follow 0/-E convention\n" | |
3231 | "%s: loading module anyway...\n", | |
3232 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3233 | dump_stack(); |
3234 | } | |
3235 | ||
3236 | /* Now it's a first class citizen! */ | |
3237 | mod->state = MODULE_STATE_LIVE; | |
3238 | blocking_notifier_call_chain(&module_notify_list, | |
3239 | MODULE_STATE_LIVE, mod); | |
3240 | ||
774a1221 TH |
3241 | /* |
3242 | * We need to finish all async code before the module init sequence | |
3243 | * is done. This has potential to deadlock. For example, a newly | |
3244 | * detected block device can trigger request_module() of the | |
3245 | * default iosched from async probing task. Once userland helper | |
3246 | * reaches here, async_synchronize_full() will wait on the async | |
3247 | * task waiting on request_module() and deadlock. | |
3248 | * | |
3249 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3250 | * iff module init queued any async jobs. This isn't a full | |
3251 | * solution as it will deadlock the same if module loading from | |
3252 | * async jobs nests more than once; however, due to the various | |
3253 | * constraints, this hack seems to be the best option for now. | |
3254 | * Please refer to the following thread for details. | |
3255 | * | |
3256 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3257 | */ | |
f2411da7 | 3258 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3259 | async_synchronize_full(); |
34e1169d KC |
3260 | |
3261 | mutex_lock(&module_mutex); | |
3262 | /* Drop initial reference. */ | |
3263 | module_put(mod); | |
3264 | trim_init_extable(mod); | |
3265 | #ifdef CONFIG_KALLSYMS | |
3266 | mod->num_symtab = mod->core_num_syms; | |
3267 | mod->symtab = mod->core_symtab; | |
3268 | mod->strtab = mod->core_strtab; | |
3269 | #endif | |
93c2e105 | 3270 | mod_tree_remove_init(mod); |
85c898db | 3271 | disable_ro_nx(&mod->init_layout); |
d453cded | 3272 | module_arch_freeing_init(mod); |
7523e4dc RR |
3273 | mod->init_layout.base = NULL; |
3274 | mod->init_layout.size = 0; | |
3275 | mod->init_layout.ro_size = 0; | |
3276 | mod->init_layout.text_size = 0; | |
c7496379 RR |
3277 | /* |
3278 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be PZ |
3279 | * walking this with preempt disabled. In all the failure paths, we |
3280 | * call synchronize_sched(), but we don't want to slow down the success | |
3281 | * path, so use actual RCU here. | |
c7496379 | 3282 | */ |
0be964be | 3283 | call_rcu_sched(&freeinit->rcu, do_free_init); |
34e1169d KC |
3284 | mutex_unlock(&module_mutex); |
3285 | wake_up_all(&module_wq); | |
3286 | ||
3287 | return 0; | |
c7496379 RR |
3288 | |
3289 | fail_free_freeinit: | |
3290 | kfree(freeinit); | |
3291 | fail: | |
3292 | /* Try to protect us from buggy refcounters. */ | |
3293 | mod->state = MODULE_STATE_GOING; | |
3294 | synchronize_sched(); | |
3295 | module_put(mod); | |
3296 | blocking_notifier_call_chain(&module_notify_list, | |
3297 | MODULE_STATE_GOING, mod); | |
3298 | free_module(mod); | |
3299 | wake_up_all(&module_wq); | |
3300 | return ret; | |
34e1169d KC |
3301 | } |
3302 | ||
3303 | static int may_init_module(void) | |
3304 | { | |
3305 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3306 | return -EPERM; | |
3307 | ||
3308 | return 0; | |
3309 | } | |
3310 | ||
a3535c7e RR |
3311 | /* |
3312 | * We try to place it in the list now to make sure it's unique before | |
3313 | * we dedicate too many resources. In particular, temporary percpu | |
3314 | * memory exhaustion. | |
3315 | */ | |
3316 | static int add_unformed_module(struct module *mod) | |
3317 | { | |
3318 | int err; | |
3319 | struct module *old; | |
3320 | ||
3321 | mod->state = MODULE_STATE_UNFORMED; | |
3322 | ||
3323 | again: | |
3324 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3325 | old = find_module_all(mod->name, strlen(mod->name), true); |
3326 | if (old != NULL) { | |
a3535c7e RR |
3327 | if (old->state == MODULE_STATE_COMING |
3328 | || old->state == MODULE_STATE_UNFORMED) { | |
3329 | /* Wait in case it fails to load. */ | |
3330 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3331 | err = wait_event_interruptible(module_wq, |
3332 | finished_loading(mod->name)); | |
a3535c7e RR |
3333 | if (err) |
3334 | goto out_unlocked; | |
3335 | goto again; | |
3336 | } | |
3337 | err = -EEXIST; | |
3338 | goto out; | |
3339 | } | |
4f666546 | 3340 | mod_update_bounds(mod); |
a3535c7e | 3341 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3342 | mod_tree_insert(mod); |
a3535c7e RR |
3343 | err = 0; |
3344 | ||
3345 | out: | |
3346 | mutex_unlock(&module_mutex); | |
3347 | out_unlocked: | |
3348 | return err; | |
3349 | } | |
3350 | ||
3351 | static int complete_formation(struct module *mod, struct load_info *info) | |
3352 | { | |
3353 | int err; | |
3354 | ||
3355 | mutex_lock(&module_mutex); | |
3356 | ||
3357 | /* Find duplicate symbols (must be called under lock). */ | |
3358 | err = verify_export_symbols(mod); | |
3359 | if (err < 0) | |
3360 | goto out; | |
3361 | ||
3362 | /* This relies on module_mutex for list integrity. */ | |
3363 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3364 | ||
20ef10c1 | 3365 | /* Set RO and NX regions */ |
85c898db RR |
3366 | module_enable_ro(mod); |
3367 | module_enable_nx(mod); | |
4982223e | 3368 | |
a3535c7e RR |
3369 | /* Mark state as coming so strong_try_module_get() ignores us, |
3370 | * but kallsyms etc. can see us. */ | |
3371 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3372 | mutex_unlock(&module_mutex); |
3373 | ||
3374 | blocking_notifier_call_chain(&module_notify_list, | |
3375 | MODULE_STATE_COMING, mod); | |
3376 | return 0; | |
a3535c7e RR |
3377 | |
3378 | out: | |
3379 | mutex_unlock(&module_mutex); | |
3380 | return err; | |
3381 | } | |
3382 | ||
ecc86170 LR |
3383 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3384 | void *arg) | |
54041d8a | 3385 | { |
f2411da7 LR |
3386 | struct module *mod = arg; |
3387 | int ret; | |
3388 | ||
3389 | if (strcmp(param, "async_probe") == 0) { | |
3390 | mod->async_probe_requested = true; | |
3391 | return 0; | |
3392 | } | |
3393 | ||
6da0b565 | 3394 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3395 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3396 | if (ret != 0) |
3397 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3398 | return 0; |
3399 | } | |
3400 | ||
d913188c RR |
3401 | /* Allocate and load the module: note that size of section 0 is always |
3402 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3403 | static int load_module(struct load_info *info, const char __user *uargs, |
3404 | int flags) | |
d913188c | 3405 | { |
a3535c7e | 3406 | struct module *mod; |
d913188c | 3407 | long err; |
51e158c1 | 3408 | char *after_dashes; |
d913188c | 3409 | |
34e1169d KC |
3410 | err = module_sig_check(info); |
3411 | if (err) | |
3412 | goto free_copy; | |
d913188c | 3413 | |
34e1169d | 3414 | err = elf_header_check(info); |
d913188c | 3415 | if (err) |
34e1169d | 3416 | goto free_copy; |
d913188c RR |
3417 | |
3418 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3419 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3420 | if (IS_ERR(mod)) { |
3421 | err = PTR_ERR(mod); | |
d913188c | 3422 | goto free_copy; |
1da177e4 | 3423 | } |
1da177e4 | 3424 | |
a3535c7e RR |
3425 | /* Reserve our place in the list. */ |
3426 | err = add_unformed_module(mod); | |
3427 | if (err) | |
1fb9341a | 3428 | goto free_module; |
1fb9341a | 3429 | |
106a4ee2 | 3430 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3431 | mod->sig_ok = info->sig_ok; |
64748a2c | 3432 | if (!mod->sig_ok) { |
bddb12b3 | 3433 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3434 | "and/or required key missing - tainting " |
bddb12b3 | 3435 | "kernel\n", mod->name); |
66cc69e3 | 3436 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3437 | } |
106a4ee2 RR |
3438 | #endif |
3439 | ||
8d8022e8 | 3440 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3441 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3442 | if (err) |
3443 | goto unlink_mod; | |
3444 | ||
49668688 | 3445 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3446 | err = module_unload_init(mod); |
3447 | if (err) | |
1fb9341a | 3448 | goto unlink_mod; |
1da177e4 | 3449 | |
cf2fde7b | 3450 | init_param_lock(mod); |
b51d23e4 | 3451 | |
22e268eb RR |
3452 | /* Now we've got everything in the final locations, we can |
3453 | * find optional sections. */ | |
eb3057df FH |
3454 | err = find_module_sections(mod, info); |
3455 | if (err) | |
3456 | goto free_unload; | |
9b37ccfc | 3457 | |
49668688 | 3458 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3459 | if (err) |
3460 | goto free_unload; | |
9841d61d | 3461 | |
c988d2b2 | 3462 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3463 | setup_modinfo(mod, info); |
c988d2b2 | 3464 | |
1da177e4 | 3465 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3466 | err = simplify_symbols(mod, info); |
1da177e4 | 3467 | if (err < 0) |
d913188c | 3468 | goto free_modinfo; |
1da177e4 | 3469 | |
34e1169d | 3470 | err = apply_relocations(mod, info); |
22e268eb | 3471 | if (err < 0) |
d913188c | 3472 | goto free_modinfo; |
1da177e4 | 3473 | |
34e1169d | 3474 | err = post_relocation(mod, info); |
1da177e4 | 3475 | if (err < 0) |
d913188c | 3476 | goto free_modinfo; |
1da177e4 | 3477 | |
22e268eb | 3478 | flush_module_icache(mod); |
378bac82 | 3479 | |
6526c534 RR |
3480 | /* Now copy in args */ |
3481 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3482 | if (IS_ERR(mod->args)) { | |
3483 | err = PTR_ERR(mod->args); | |
3484 | goto free_arch_cleanup; | |
3485 | } | |
8d3b33f6 | 3486 | |
34e1169d | 3487 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3488 | |
a949ae56 SRRH |
3489 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3490 | ftrace_module_init(mod); | |
3491 | ||
a3535c7e RR |
3492 | /* Finally it's fully formed, ready to start executing. */ |
3493 | err = complete_formation(mod, info); | |
3494 | if (err) | |
1fb9341a | 3495 | goto ddebug_cleanup; |
be593f4c | 3496 | |
51f3d0f4 | 3497 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3498 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
ecc86170 LR |
3499 | -32768, 32767, NULL, |
3500 | unknown_module_param_cb); | |
51e158c1 RR |
3501 | if (IS_ERR(after_dashes)) { |
3502 | err = PTR_ERR(after_dashes); | |
1fb9341a | 3503 | goto bug_cleanup; |
51e158c1 RR |
3504 | } else if (after_dashes) { |
3505 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3506 | mod->name, after_dashes); | |
3507 | } | |
1da177e4 | 3508 | |
51f3d0f4 | 3509 | /* Link in to syfs. */ |
34e1169d | 3510 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3511 | if (err < 0) |
1fb9341a | 3512 | goto bug_cleanup; |
80a3d1bb | 3513 | |
48fd1188 | 3514 | /* Get rid of temporary copy. */ |
34e1169d | 3515 | free_copy(info); |
1da177e4 LT |
3516 | |
3517 | /* Done! */ | |
51f3d0f4 | 3518 | trace_module_load(mod); |
34e1169d KC |
3519 | |
3520 | return do_init_module(mod); | |
1da177e4 | 3521 | |
1fb9341a RR |
3522 | bug_cleanup: |
3523 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3524 | mutex_lock(&module_mutex); |
5336377d | 3525 | module_bug_cleanup(mod); |
ee61abb3 | 3526 | mutex_unlock(&module_mutex); |
ff7e0055 | 3527 | |
37815bf8 SR |
3528 | blocking_notifier_call_chain(&module_notify_list, |
3529 | MODULE_STATE_GOING, mod); | |
3530 | ||
ff7e0055 | 3531 | /* we can't deallocate the module until we clear memory protection */ |
85c898db RR |
3532 | module_disable_ro(mod); |
3533 | module_disable_nx(mod); | |
ff7e0055 | 3534 | |
a3535c7e | 3535 | ddebug_cleanup: |
1fb9341a | 3536 | dynamic_debug_remove(info->debug); |
e91defa2 | 3537 | synchronize_sched(); |
6526c534 RR |
3538 | kfree(mod->args); |
3539 | free_arch_cleanup: | |
1da177e4 | 3540 | module_arch_cleanup(mod); |
d913188c | 3541 | free_modinfo: |
a263f776 | 3542 | free_modinfo(mod); |
22e268eb | 3543 | free_unload: |
1da177e4 | 3544 | module_unload_free(mod); |
1fb9341a RR |
3545 | unlink_mod: |
3546 | mutex_lock(&module_mutex); | |
3547 | /* Unlink carefully: kallsyms could be walking list. */ | |
3548 | list_del_rcu(&mod->list); | |
758556bd | 3549 | mod_tree_remove(mod); |
1fb9341a | 3550 | wake_up_all(&module_wq); |
0be964be PZ |
3551 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
3552 | synchronize_sched(); | |
1fb9341a | 3553 | mutex_unlock(&module_mutex); |
d913188c | 3554 | free_module: |
049fb9bd SRRH |
3555 | /* |
3556 | * Ftrace needs to clean up what it initialized. | |
3557 | * This does nothing if ftrace_module_init() wasn't called, | |
3558 | * but it must be called outside of module_mutex. | |
3559 | */ | |
3560 | ftrace_release_mod(mod); | |
35a9393c | 3561 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3562 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3563 | |
34e1169d | 3564 | module_deallocate(mod, info); |
d913188c | 3565 | free_copy: |
34e1169d KC |
3566 | free_copy(info); |
3567 | return err; | |
b99b87f7 PO |
3568 | } |
3569 | ||
17da2bd9 HC |
3570 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3571 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3572 | { |
34e1169d KC |
3573 | int err; |
3574 | struct load_info info = { }; | |
1da177e4 | 3575 | |
34e1169d KC |
3576 | err = may_init_module(); |
3577 | if (err) | |
3578 | return err; | |
1da177e4 | 3579 | |
34e1169d KC |
3580 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3581 | umod, len, uargs); | |
1da177e4 | 3582 | |
34e1169d KC |
3583 | err = copy_module_from_user(umod, len, &info); |
3584 | if (err) | |
3585 | return err; | |
1da177e4 | 3586 | |
2f3238ae | 3587 | return load_module(&info, uargs, 0); |
34e1169d | 3588 | } |
94462ad3 | 3589 | |
2f3238ae | 3590 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d KC |
3591 | { |
3592 | int err; | |
3593 | struct load_info info = { }; | |
94462ad3 | 3594 | |
34e1169d KC |
3595 | err = may_init_module(); |
3596 | if (err) | |
3597 | return err; | |
1da177e4 | 3598 | |
2f3238ae | 3599 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3600 | |
2f3238ae RR |
3601 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3602 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3603 | return -EINVAL; | |
d6de2c80 | 3604 | |
34e1169d KC |
3605 | err = copy_module_from_fd(fd, &info); |
3606 | if (err) | |
3607 | return err; | |
1da177e4 | 3608 | |
2f3238ae | 3609 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3610 | } |
3611 | ||
3612 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3613 | { | |
3614 | return ((void *)addr >= start && (void *)addr < start + size); | |
3615 | } | |
3616 | ||
3617 | #ifdef CONFIG_KALLSYMS | |
3618 | /* | |
3619 | * This ignores the intensely annoying "mapping symbols" found | |
3620 | * in ARM ELF files: $a, $t and $d. | |
3621 | */ | |
3622 | static inline int is_arm_mapping_symbol(const char *str) | |
3623 | { | |
2e3a10a1 RK |
3624 | if (str[0] == '.' && str[1] == 'L') |
3625 | return true; | |
6c34f1f5 | 3626 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3627 | && (str[2] == '\0' || str[2] == '.'); |
3628 | } | |
3629 | ||
3630 | static const char *get_ksymbol(struct module *mod, | |
3631 | unsigned long addr, | |
3632 | unsigned long *size, | |
3633 | unsigned long *offset) | |
3634 | { | |
3635 | unsigned int i, best = 0; | |
3636 | unsigned long nextval; | |
3637 | ||
3638 | /* At worse, next value is at end of module */ | |
a06f6211 | 3639 | if (within_module_init(addr, mod)) |
7523e4dc | 3640 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 3641 | else |
7523e4dc | 3642 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 3643 | |
25985edc | 3644 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3645 | starts real symbols at 1). */ |
1da177e4 LT |
3646 | for (i = 1; i < mod->num_symtab; i++) { |
3647 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
3648 | continue; | |
3649 | ||
3650 | /* We ignore unnamed symbols: they're uninformative | |
3651 | * and inserted at a whim. */ | |
3652 | if (mod->symtab[i].st_value <= addr | |
3653 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
3654 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3655 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3656 | best = i; | |
3657 | if (mod->symtab[i].st_value > addr | |
3658 | && mod->symtab[i].st_value < nextval | |
3659 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3660 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3661 | nextval = mod->symtab[i].st_value; | |
3662 | } | |
3663 | ||
3664 | if (!best) | |
3665 | return NULL; | |
3666 | ||
ffb45122 AD |
3667 | if (size) |
3668 | *size = nextval - mod->symtab[best].st_value; | |
3669 | if (offset) | |
3670 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
3671 | return mod->strtab + mod->symtab[best].st_name; |
3672 | } | |
3673 | ||
6dd06c9f RR |
3674 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3675 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3676 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3677 | unsigned long *size, |
3678 | unsigned long *offset, | |
3679 | char **modname, | |
3680 | char *namebuf) | |
1da177e4 | 3681 | { |
cb2a5205 | 3682 | const char *ret = NULL; |
b7df4d1b | 3683 | struct module *mod; |
1da177e4 | 3684 | |
cb2a5205 | 3685 | preempt_disable(); |
b7df4d1b PZ |
3686 | mod = __module_address(addr); |
3687 | if (mod) { | |
3688 | if (modname) | |
3689 | *modname = mod->name; | |
3690 | ret = get_ksymbol(mod, addr, size, offset); | |
1da177e4 | 3691 | } |
6dd06c9f RR |
3692 | /* Make a copy in here where it's safe */ |
3693 | if (ret) { | |
3694 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3695 | ret = namebuf; | |
3696 | } | |
cb2a5205 | 3697 | preempt_enable(); |
b7df4d1b | 3698 | |
92dfc9dc | 3699 | return ret; |
1da177e4 LT |
3700 | } |
3701 | ||
9d65cb4a AD |
3702 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3703 | { | |
3704 | struct module *mod; | |
3705 | ||
cb2a5205 | 3706 | preempt_disable(); |
d72b3751 | 3707 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3708 | if (mod->state == MODULE_STATE_UNFORMED) |
3709 | continue; | |
9b20a352 | 3710 | if (within_module(addr, mod)) { |
9d65cb4a AD |
3711 | const char *sym; |
3712 | ||
3713 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3714 | if (!sym) | |
3715 | goto out; | |
9281acea | 3716 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3717 | preempt_enable(); |
9d65cb4a AD |
3718 | return 0; |
3719 | } | |
3720 | } | |
3721 | out: | |
cb2a5205 | 3722 | preempt_enable(); |
9d65cb4a AD |
3723 | return -ERANGE; |
3724 | } | |
3725 | ||
a5c43dae AD |
3726 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3727 | unsigned long *offset, char *modname, char *name) | |
3728 | { | |
3729 | struct module *mod; | |
3730 | ||
cb2a5205 | 3731 | preempt_disable(); |
d72b3751 | 3732 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3733 | if (mod->state == MODULE_STATE_UNFORMED) |
3734 | continue; | |
9b20a352 | 3735 | if (within_module(addr, mod)) { |
a5c43dae AD |
3736 | const char *sym; |
3737 | ||
3738 | sym = get_ksymbol(mod, addr, size, offset); | |
3739 | if (!sym) | |
3740 | goto out; | |
3741 | if (modname) | |
9281acea | 3742 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3743 | if (name) |
9281acea | 3744 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3745 | preempt_enable(); |
a5c43dae AD |
3746 | return 0; |
3747 | } | |
3748 | } | |
3749 | out: | |
cb2a5205 | 3750 | preempt_enable(); |
a5c43dae AD |
3751 | return -ERANGE; |
3752 | } | |
3753 | ||
ea07890a AD |
3754 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3755 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3756 | { |
3757 | struct module *mod; | |
3758 | ||
cb2a5205 | 3759 | preempt_disable(); |
d72b3751 | 3760 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3761 | if (mod->state == MODULE_STATE_UNFORMED) |
3762 | continue; | |
1da177e4 LT |
3763 | if (symnum < mod->num_symtab) { |
3764 | *value = mod->symtab[symnum].st_value; | |
3765 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 3766 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
3767 | KSYM_NAME_LEN); |
3768 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 3769 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3770 | preempt_enable(); |
ea07890a | 3771 | return 0; |
1da177e4 LT |
3772 | } |
3773 | symnum -= mod->num_symtab; | |
3774 | } | |
cb2a5205 | 3775 | preempt_enable(); |
ea07890a | 3776 | return -ERANGE; |
1da177e4 LT |
3777 | } |
3778 | ||
3779 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3780 | { | |
3781 | unsigned int i; | |
3782 | ||
3783 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
3784 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3785 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
3786 | return mod->symtab[i].st_value; |
3787 | return 0; | |
3788 | } | |
3789 | ||
3790 | /* Look for this name: can be of form module:name. */ | |
3791 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3792 | { | |
3793 | struct module *mod; | |
3794 | char *colon; | |
3795 | unsigned long ret = 0; | |
3796 | ||
3797 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3798 | preempt_disable(); |
1da177e4 | 3799 | if ((colon = strchr(name, ':')) != NULL) { |
4f6de4d5 | 3800 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 3801 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 3802 | } else { |
0d21b0e3 RR |
3803 | list_for_each_entry_rcu(mod, &modules, list) { |
3804 | if (mod->state == MODULE_STATE_UNFORMED) | |
3805 | continue; | |
1da177e4 LT |
3806 | if ((ret = mod_find_symname(mod, name)) != 0) |
3807 | break; | |
0d21b0e3 | 3808 | } |
1da177e4 | 3809 | } |
cb2a5205 | 3810 | preempt_enable(); |
1da177e4 LT |
3811 | return ret; |
3812 | } | |
75a66614 AK |
3813 | |
3814 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3815 | struct module *, unsigned long), | |
3816 | void *data) | |
3817 | { | |
3818 | struct module *mod; | |
3819 | unsigned int i; | |
3820 | int ret; | |
3821 | ||
0be964be PZ |
3822 | module_assert_mutex(); |
3823 | ||
75a66614 | 3824 | list_for_each_entry(mod, &modules, list) { |
0d21b0e3 RR |
3825 | if (mod->state == MODULE_STATE_UNFORMED) |
3826 | continue; | |
75a66614 AK |
3827 | for (i = 0; i < mod->num_symtab; i++) { |
3828 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3829 | mod, mod->symtab[i].st_value); | |
3830 | if (ret != 0) | |
3831 | return ret; | |
3832 | } | |
3833 | } | |
3834 | return 0; | |
3835 | } | |
1da177e4 LT |
3836 | #endif /* CONFIG_KALLSYMS */ |
3837 | ||
21aa9280 | 3838 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3839 | { |
3840 | int bx = 0; | |
3841 | ||
0d21b0e3 | 3842 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
3843 | if (mod->taints || |
3844 | mod->state == MODULE_STATE_GOING || | |
3845 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3846 | buf[bx++] = '('; |
cca3e707 | 3847 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
3848 | /* Show a - for module-is-being-unloaded */ |
3849 | if (mod->state == MODULE_STATE_GOING) | |
3850 | buf[bx++] = '-'; | |
3851 | /* Show a + for module-is-being-loaded */ | |
3852 | if (mod->state == MODULE_STATE_COMING) | |
3853 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3854 | buf[bx++] = ')'; |
3855 | } | |
3856 | buf[bx] = '\0'; | |
3857 | ||
3858 | return buf; | |
3859 | } | |
3860 | ||
3b5d5c6b AD |
3861 | #ifdef CONFIG_PROC_FS |
3862 | /* Called by the /proc file system to return a list of modules. */ | |
3863 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3864 | { | |
3865 | mutex_lock(&module_mutex); | |
3866 | return seq_list_start(&modules, *pos); | |
3867 | } | |
3868 | ||
3869 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3870 | { | |
3871 | return seq_list_next(p, &modules, pos); | |
3872 | } | |
3873 | ||
3874 | static void m_stop(struct seq_file *m, void *p) | |
3875 | { | |
3876 | mutex_unlock(&module_mutex); | |
3877 | } | |
3878 | ||
1da177e4 LT |
3879 | static int m_show(struct seq_file *m, void *p) |
3880 | { | |
3881 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3882 | char buf[8]; |
3883 | ||
0d21b0e3 RR |
3884 | /* We always ignore unformed modules. */ |
3885 | if (mod->state == MODULE_STATE_UNFORMED) | |
3886 | return 0; | |
3887 | ||
2f0f2a33 | 3888 | seq_printf(m, "%s %u", |
7523e4dc | 3889 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
3890 | print_unload_info(m, mod); |
3891 | ||
3892 | /* Informative for users. */ | |
3893 | seq_printf(m, " %s", | |
6da0b565 IA |
3894 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
3895 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
3896 | "Live"); |
3897 | /* Used by oprofile and other similar tools. */ | |
7523e4dc | 3898 | seq_printf(m, " 0x%pK", mod->core_layout.base); |
1da177e4 | 3899 | |
fa3ba2e8 FM |
3900 | /* Taints info */ |
3901 | if (mod->taints) | |
21aa9280 | 3902 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3903 | |
6da0b565 | 3904 | seq_puts(m, "\n"); |
1da177e4 LT |
3905 | return 0; |
3906 | } | |
3907 | ||
3908 | /* Format: modulename size refcount deps address | |
3909 | ||
3910 | Where refcount is a number or -, and deps is a comma-separated list | |
3911 | of depends or -. | |
3912 | */ | |
3b5d5c6b | 3913 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3914 | .start = m_start, |
3915 | .next = m_next, | |
3916 | .stop = m_stop, | |
3917 | .show = m_show | |
3918 | }; | |
3919 | ||
3b5d5c6b AD |
3920 | static int modules_open(struct inode *inode, struct file *file) |
3921 | { | |
3922 | return seq_open(file, &modules_op); | |
3923 | } | |
3924 | ||
3925 | static const struct file_operations proc_modules_operations = { | |
3926 | .open = modules_open, | |
3927 | .read = seq_read, | |
3928 | .llseek = seq_lseek, | |
3929 | .release = seq_release, | |
3930 | }; | |
3931 | ||
3932 | static int __init proc_modules_init(void) | |
3933 | { | |
3934 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3935 | return 0; | |
3936 | } | |
3937 | module_init(proc_modules_init); | |
3938 | #endif | |
3939 | ||
1da177e4 LT |
3940 | /* Given an address, look for it in the module exception tables. */ |
3941 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3942 | { | |
1da177e4 LT |
3943 | const struct exception_table_entry *e = NULL; |
3944 | struct module *mod; | |
3945 | ||
24da1cbf | 3946 | preempt_disable(); |
d72b3751 | 3947 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3948 | if (mod->state == MODULE_STATE_UNFORMED) |
3949 | continue; | |
1da177e4 LT |
3950 | if (mod->num_exentries == 0) |
3951 | continue; | |
22a8bdeb | 3952 | |
1da177e4 LT |
3953 | e = search_extable(mod->extable, |
3954 | mod->extable + mod->num_exentries - 1, | |
3955 | addr); | |
3956 | if (e) | |
3957 | break; | |
3958 | } | |
24da1cbf | 3959 | preempt_enable(); |
1da177e4 LT |
3960 | |
3961 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3962 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3963 | return e; |
3964 | } | |
3965 | ||
4d435f9d | 3966 | /* |
e610499e RR |
3967 | * is_module_address - is this address inside a module? |
3968 | * @addr: the address to check. | |
3969 | * | |
3970 | * See is_module_text_address() if you simply want to see if the address | |
3971 | * is code (not data). | |
4d435f9d | 3972 | */ |
e610499e | 3973 | bool is_module_address(unsigned long addr) |
4d435f9d | 3974 | { |
e610499e | 3975 | bool ret; |
4d435f9d | 3976 | |
24da1cbf | 3977 | preempt_disable(); |
e610499e | 3978 | ret = __module_address(addr) != NULL; |
24da1cbf | 3979 | preempt_enable(); |
4d435f9d | 3980 | |
e610499e | 3981 | return ret; |
4d435f9d IM |
3982 | } |
3983 | ||
e610499e RR |
3984 | /* |
3985 | * __module_address - get the module which contains an address. | |
3986 | * @addr: the address. | |
3987 | * | |
3988 | * Must be called with preempt disabled or module mutex held so that | |
3989 | * module doesn't get freed during this. | |
3990 | */ | |
714f83d5 | 3991 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3992 | { |
3993 | struct module *mod; | |
3994 | ||
3a642e99 RR |
3995 | if (addr < module_addr_min || addr > module_addr_max) |
3996 | return NULL; | |
3997 | ||
0be964be PZ |
3998 | module_assert_mutex_or_preempt(); |
3999 | ||
6c9692e2 | 4000 | mod = mod_find(addr); |
93c2e105 PZ |
4001 | if (mod) { |
4002 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4003 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4004 | mod = NULL; |
0d21b0e3 | 4005 | } |
93c2e105 | 4006 | return mod; |
1da177e4 | 4007 | } |
c6b37801 | 4008 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4009 | |
e610499e RR |
4010 | /* |
4011 | * is_module_text_address - is this address inside module code? | |
4012 | * @addr: the address to check. | |
4013 | * | |
4014 | * See is_module_address() if you simply want to see if the address is | |
4015 | * anywhere in a module. See kernel_text_address() for testing if an | |
4016 | * address corresponds to kernel or module code. | |
4017 | */ | |
4018 | bool is_module_text_address(unsigned long addr) | |
4019 | { | |
4020 | bool ret; | |
4021 | ||
4022 | preempt_disable(); | |
4023 | ret = __module_text_address(addr) != NULL; | |
4024 | preempt_enable(); | |
4025 | ||
4026 | return ret; | |
4027 | } | |
4028 | ||
4029 | /* | |
4030 | * __module_text_address - get the module whose code contains an address. | |
4031 | * @addr: the address. | |
4032 | * | |
4033 | * Must be called with preempt disabled or module mutex held so that | |
4034 | * module doesn't get freed during this. | |
4035 | */ | |
4036 | struct module *__module_text_address(unsigned long addr) | |
4037 | { | |
4038 | struct module *mod = __module_address(addr); | |
4039 | if (mod) { | |
4040 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4041 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4042 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4043 | mod = NULL; |
4044 | } | |
4045 | return mod; | |
4046 | } | |
c6b37801 | 4047 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4048 | |
1da177e4 LT |
4049 | /* Don't grab lock, we're oopsing. */ |
4050 | void print_modules(void) | |
4051 | { | |
4052 | struct module *mod; | |
2bc2d61a | 4053 | char buf[8]; |
1da177e4 | 4054 | |
b231125a | 4055 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4056 | /* Most callers should already have preempt disabled, but make sure */ |
4057 | preempt_disable(); | |
0d21b0e3 RR |
4058 | list_for_each_entry_rcu(mod, &modules, list) { |
4059 | if (mod->state == MODULE_STATE_UNFORMED) | |
4060 | continue; | |
27bba4d6 | 4061 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4062 | } |
d72b3751 | 4063 | preempt_enable(); |
e14af7ee | 4064 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4065 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4066 | pr_cont("\n"); | |
1da177e4 LT |
4067 | } |
4068 | ||
1da177e4 | 4069 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4070 | /* Generate the signature for all relevant module structures here. |
4071 | * If these change, we don't want to try to parse the module. */ | |
4072 | void module_layout(struct module *mod, | |
4073 | struct modversion_info *ver, | |
4074 | struct kernel_param *kp, | |
4075 | struct kernel_symbol *ks, | |
65498646 | 4076 | struct tracepoint * const *tp) |
8c8ef42a RR |
4077 | { |
4078 | } | |
4079 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4080 | #endif |