]>
Commit | Line | Data |
---|---|---|
f71d20e9 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 LT |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
9984de1a | 19 | #include <linux/export.h> |
1da177e4 | 20 | #include <linux/moduleloader.h> |
6d723736 | 21 | #include <linux/ftrace_event.h> |
1da177e4 | 22 | #include <linux/init.h> |
ae84e324 | 23 | #include <linux/kallsyms.h> |
34e1169d | 24 | #include <linux/file.h> |
3b5d5c6b | 25 | #include <linux/fs.h> |
6d760133 | 26 | #include <linux/sysfs.h> |
9f158333 | 27 | #include <linux/kernel.h> |
1da177e4 LT |
28 | #include <linux/slab.h> |
29 | #include <linux/vmalloc.h> | |
30 | #include <linux/elf.h> | |
3b5d5c6b | 31 | #include <linux/proc_fs.h> |
2e72d51b | 32 | #include <linux/security.h> |
1da177e4 LT |
33 | #include <linux/seq_file.h> |
34 | #include <linux/syscalls.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/rcupdate.h> | |
c59ede7b | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/cpu.h> |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/err.h> | |
42 | #include <linux/vermagic.h> | |
43 | #include <linux/notifier.h> | |
f6a57033 | 44 | #include <linux/sched.h> |
1da177e4 LT |
45 | #include <linux/stop_machine.h> |
46 | #include <linux/device.h> | |
c988d2b2 | 47 | #include <linux/string.h> |
97d1f15b | 48 | #include <linux/mutex.h> |
d72b3751 | 49 | #include <linux/rculist.h> |
1da177e4 | 50 | #include <asm/uaccess.h> |
1da177e4 | 51 | #include <asm/cacheflush.h> |
eb8cdec4 | 52 | #include <asm/mmu_context.h> |
b817f6fe | 53 | #include <linux/license.h> |
6d762394 | 54 | #include <asm/sections.h> |
97e1c18e | 55 | #include <linux/tracepoint.h> |
90d595fe | 56 | #include <linux/ftrace.h> |
22a9d645 | 57 | #include <linux/async.h> |
fbf59bc9 | 58 | #include <linux/percpu.h> |
4f2294b6 | 59 | #include <linux/kmemleak.h> |
bf5438fc | 60 | #include <linux/jump_label.h> |
84e1c6bb | 61 | #include <linux/pfn.h> |
403ed278 | 62 | #include <linux/bsearch.h> |
1d0059f3 | 63 | #include <linux/fips.h> |
2f3238ae | 64 | #include <uapi/linux/module.h> |
106a4ee2 | 65 | #include "module-internal.h" |
1da177e4 | 66 | |
7ead8b83 LZ |
67 | #define CREATE_TRACE_POINTS |
68 | #include <trace/events/module.h> | |
69 | ||
1da177e4 LT |
70 | #ifndef ARCH_SHF_SMALL |
71 | #define ARCH_SHF_SMALL 0 | |
72 | #endif | |
73 | ||
84e1c6bb MC |
74 | /* |
75 | * Modules' sections will be aligned on page boundaries | |
76 | * to ensure complete separation of code and data, but | |
77 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y | |
78 | */ | |
79 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
80 | # define debug_align(X) ALIGN(X, PAGE_SIZE) | |
81 | #else | |
82 | # define debug_align(X) (X) | |
83 | #endif | |
84 | ||
85 | /* | |
86 | * Given BASE and SIZE this macro calculates the number of pages the | |
87 | * memory regions occupies | |
88 | */ | |
89 | #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \ | |
90 | (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \ | |
91 | PFN_DOWN((unsigned long)BASE) + 1) \ | |
92 | : (0UL)) | |
93 | ||
1da177e4 LT |
94 | /* If this is set, the section belongs in the init part of the module */ |
95 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
96 | ||
75676500 RR |
97 | /* |
98 | * Mutex protects: | |
99 | * 1) List of modules (also safely readable with preempt_disable), | |
100 | * 2) module_use links, | |
101 | * 3) module_addr_min/module_addr_max. | |
d72b3751 | 102 | * (delete uses stop_machine/add uses RCU list operations). */ |
c6b37801 TA |
103 | DEFINE_MUTEX(module_mutex); |
104 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 105 | static LIST_HEAD(modules); |
67fc4e0c JW |
106 | #ifdef CONFIG_KGDB_KDB |
107 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
108 | #endif /* CONFIG_KGDB_KDB */ | |
109 | ||
106a4ee2 RR |
110 | #ifdef CONFIG_MODULE_SIG |
111 | #ifdef CONFIG_MODULE_SIG_FORCE | |
112 | static bool sig_enforce = true; | |
113 | #else | |
114 | static bool sig_enforce = false; | |
115 | ||
116 | static int param_set_bool_enable_only(const char *val, | |
117 | const struct kernel_param *kp) | |
118 | { | |
119 | int err; | |
120 | bool test; | |
121 | struct kernel_param dummy_kp = *kp; | |
122 | ||
123 | dummy_kp.arg = &test; | |
124 | ||
125 | err = param_set_bool(val, &dummy_kp); | |
126 | if (err) | |
127 | return err; | |
128 | ||
129 | /* Don't let them unset it once it's set! */ | |
130 | if (!test && sig_enforce) | |
131 | return -EROFS; | |
132 | ||
133 | if (test) | |
134 | sig_enforce = true; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static const struct kernel_param_ops param_ops_bool_enable_only = { | |
139 | .set = param_set_bool_enable_only, | |
140 | .get = param_get_bool, | |
141 | }; | |
142 | #define param_check_bool_enable_only param_check_bool | |
143 | ||
144 | module_param(sig_enforce, bool_enable_only, 0644); | |
145 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
146 | #endif /* CONFIG_MODULE_SIG */ | |
1da177e4 | 147 | |
19e4529e SR |
148 | /* Block module loading/unloading? */ |
149 | int modules_disabled = 0; | |
02608bef | 150 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 151 | |
c9a3ba55 RR |
152 | /* Waiting for a module to finish initializing? */ |
153 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
154 | ||
e041c683 | 155 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 156 | |
75676500 RR |
157 | /* Bounds of module allocation, for speeding __module_address. |
158 | * Protected by module_mutex. */ | |
3a642e99 RR |
159 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
160 | ||
1da177e4 LT |
161 | int register_module_notifier(struct notifier_block * nb) |
162 | { | |
e041c683 | 163 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
164 | } |
165 | EXPORT_SYMBOL(register_module_notifier); | |
166 | ||
167 | int unregister_module_notifier(struct notifier_block * nb) | |
168 | { | |
e041c683 | 169 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
170 | } |
171 | EXPORT_SYMBOL(unregister_module_notifier); | |
172 | ||
eded41c1 RR |
173 | struct load_info { |
174 | Elf_Ehdr *hdr; | |
175 | unsigned long len; | |
176 | Elf_Shdr *sechdrs; | |
6526c534 | 177 | char *secstrings, *strtab; |
d913188c | 178 | unsigned long symoffs, stroffs; |
811d66a0 RR |
179 | struct _ddebug *debug; |
180 | unsigned int num_debug; | |
106a4ee2 | 181 | bool sig_ok; |
eded41c1 RR |
182 | struct { |
183 | unsigned int sym, str, mod, vers, info, pcpu; | |
184 | } index; | |
185 | }; | |
186 | ||
9a4b9708 ML |
187 | /* We require a truly strong try_module_get(): 0 means failure due to |
188 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
189 | static inline int strong_try_module_get(struct module *mod) |
190 | { | |
0d21b0e3 | 191 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 192 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
193 | return -EBUSY; |
194 | if (try_module_get(mod)) | |
1da177e4 | 195 | return 0; |
c9a3ba55 RR |
196 | else |
197 | return -ENOENT; | |
1da177e4 LT |
198 | } |
199 | ||
373d4d09 RR |
200 | static inline void add_taint_module(struct module *mod, unsigned flag, |
201 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 202 | { |
373d4d09 | 203 | add_taint(flag, lockdep_ok); |
25ddbb18 | 204 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
205 | } |
206 | ||
02a3e59a RD |
207 | /* |
208 | * A thread that wants to hold a reference to a module only while it | |
209 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
210 | */ |
211 | void __module_put_and_exit(struct module *mod, long code) | |
212 | { | |
213 | module_put(mod); | |
214 | do_exit(code); | |
215 | } | |
216 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 217 | |
1da177e4 | 218 | /* Find a module section: 0 means not found. */ |
49668688 | 219 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
220 | { |
221 | unsigned int i; | |
222 | ||
49668688 RR |
223 | for (i = 1; i < info->hdr->e_shnum; i++) { |
224 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 225 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
226 | if ((shdr->sh_flags & SHF_ALLOC) |
227 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 228 | return i; |
49668688 | 229 | } |
1da177e4 LT |
230 | return 0; |
231 | } | |
232 | ||
5e458cc0 | 233 | /* Find a module section, or NULL. */ |
49668688 | 234 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
235 | { |
236 | /* Section 0 has sh_addr 0. */ | |
49668688 | 237 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
238 | } |
239 | ||
240 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 241 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
242 | const char *name, |
243 | size_t object_size, | |
244 | unsigned int *num) | |
245 | { | |
49668688 | 246 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
247 | |
248 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
249 | *num = info->sechdrs[sec].sh_size / object_size; |
250 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
251 | } |
252 | ||
1da177e4 LT |
253 | /* Provided by the linker */ |
254 | extern const struct kernel_symbol __start___ksymtab[]; | |
255 | extern const struct kernel_symbol __stop___ksymtab[]; | |
256 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
257 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
258 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
259 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
260 | extern const unsigned long __start___kcrctab[]; |
261 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 262 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
263 | #ifdef CONFIG_UNUSED_SYMBOLS |
264 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
265 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
266 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
267 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
268 | extern const unsigned long __start___kcrctab_unused[]; |
269 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 270 | #endif |
1da177e4 LT |
271 | |
272 | #ifndef CONFIG_MODVERSIONS | |
273 | #define symversion(base, idx) NULL | |
274 | #else | |
f83ca9fe | 275 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
276 | #endif |
277 | ||
dafd0940 RR |
278 | static bool each_symbol_in_section(const struct symsearch *arr, |
279 | unsigned int arrsize, | |
280 | struct module *owner, | |
281 | bool (*fn)(const struct symsearch *syms, | |
282 | struct module *owner, | |
de4d8d53 | 283 | void *data), |
dafd0940 | 284 | void *data) |
ad9546c9 | 285 | { |
de4d8d53 | 286 | unsigned int j; |
ad9546c9 | 287 | |
dafd0940 | 288 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
289 | if (fn(&arr[j], owner, data)) |
290 | return true; | |
f71d20e9 | 291 | } |
dafd0940 RR |
292 | |
293 | return false; | |
ad9546c9 RR |
294 | } |
295 | ||
dafd0940 | 296 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
297 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
298 | struct module *owner, | |
299 | void *data), | |
300 | void *data) | |
ad9546c9 RR |
301 | { |
302 | struct module *mod; | |
44032e63 | 303 | static const struct symsearch arr[] = { |
ad9546c9 | 304 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 305 | NOT_GPL_ONLY, false }, |
ad9546c9 | 306 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
307 | __start___kcrctab_gpl, |
308 | GPL_ONLY, false }, | |
ad9546c9 | 309 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
310 | __start___kcrctab_gpl_future, |
311 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 312 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 313 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
314 | __start___kcrctab_unused, |
315 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 316 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
317 | __start___kcrctab_unused_gpl, |
318 | GPL_ONLY, true }, | |
f7f5b675 | 319 | #endif |
ad9546c9 | 320 | }; |
f71d20e9 | 321 | |
dafd0940 RR |
322 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
323 | return true; | |
f71d20e9 | 324 | |
d72b3751 | 325 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
326 | struct symsearch arr[] = { |
327 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 328 | NOT_GPL_ONLY, false }, |
ad9546c9 | 329 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
330 | mod->gpl_crcs, |
331 | GPL_ONLY, false }, | |
ad9546c9 RR |
332 | { mod->gpl_future_syms, |
333 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
334 | mod->gpl_future_crcs, |
335 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 336 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
337 | { mod->unused_syms, |
338 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
339 | mod->unused_crcs, |
340 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
341 | { mod->unused_gpl_syms, |
342 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
343 | mod->unused_gpl_crcs, |
344 | GPL_ONLY, true }, | |
f7f5b675 | 345 | #endif |
ad9546c9 RR |
346 | }; |
347 | ||
0d21b0e3 RR |
348 | if (mod->state == MODULE_STATE_UNFORMED) |
349 | continue; | |
350 | ||
dafd0940 RR |
351 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
352 | return true; | |
353 | } | |
354 | return false; | |
355 | } | |
de4d8d53 | 356 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
357 | |
358 | struct find_symbol_arg { | |
359 | /* Input */ | |
360 | const char *name; | |
361 | bool gplok; | |
362 | bool warn; | |
363 | ||
364 | /* Output */ | |
365 | struct module *owner; | |
366 | const unsigned long *crc; | |
414fd31b | 367 | const struct kernel_symbol *sym; |
dafd0940 RR |
368 | }; |
369 | ||
de4d8d53 RR |
370 | static bool check_symbol(const struct symsearch *syms, |
371 | struct module *owner, | |
372 | unsigned int symnum, void *data) | |
dafd0940 RR |
373 | { |
374 | struct find_symbol_arg *fsa = data; | |
375 | ||
dafd0940 RR |
376 | if (!fsa->gplok) { |
377 | if (syms->licence == GPL_ONLY) | |
378 | return false; | |
379 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
380 | printk(KERN_WARNING "Symbol %s is being used " | |
381 | "by a non-GPL module, which will not " | |
382 | "be allowed in the future\n", fsa->name); | |
9f28bb7e | 383 | } |
1da177e4 | 384 | } |
ad9546c9 | 385 | |
f7f5b675 | 386 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
387 | if (syms->unused && fsa->warn) { |
388 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
389 | "however this module is using it.\n", fsa->name); | |
390 | printk(KERN_WARNING | |
391 | "This symbol will go away in the future.\n"); | |
392 | printk(KERN_WARNING | |
393 | "Please evalute if this is the right api to use and if " | |
394 | "it really is, submit a report the linux kernel " | |
395 | "mailinglist together with submitting your code for " | |
396 | "inclusion.\n"); | |
397 | } | |
f7f5b675 | 398 | #endif |
dafd0940 RR |
399 | |
400 | fsa->owner = owner; | |
401 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 402 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
403 | return true; |
404 | } | |
405 | ||
403ed278 AIB |
406 | static int cmp_name(const void *va, const void *vb) |
407 | { | |
408 | const char *a; | |
409 | const struct kernel_symbol *b; | |
410 | a = va; b = vb; | |
411 | return strcmp(a, b->name); | |
412 | } | |
413 | ||
de4d8d53 RR |
414 | static bool find_symbol_in_section(const struct symsearch *syms, |
415 | struct module *owner, | |
416 | void *data) | |
417 | { | |
418 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
419 | struct kernel_symbol *sym; |
420 | ||
421 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
422 | sizeof(struct kernel_symbol), cmp_name); | |
423 | ||
424 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
425 | return true; | |
de4d8d53 | 426 | |
de4d8d53 RR |
427 | return false; |
428 | } | |
429 | ||
414fd31b | 430 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 431 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
432 | const struct kernel_symbol *find_symbol(const char *name, |
433 | struct module **owner, | |
434 | const unsigned long **crc, | |
435 | bool gplok, | |
436 | bool warn) | |
dafd0940 RR |
437 | { |
438 | struct find_symbol_arg fsa; | |
439 | ||
440 | fsa.name = name; | |
441 | fsa.gplok = gplok; | |
442 | fsa.warn = warn; | |
443 | ||
de4d8d53 | 444 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
445 | if (owner) |
446 | *owner = fsa.owner; | |
447 | if (crc) | |
448 | *crc = fsa.crc; | |
414fd31b | 449 | return fsa.sym; |
dafd0940 RR |
450 | } |
451 | ||
5e124169 | 452 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 453 | return NULL; |
1da177e4 | 454 | } |
c6b37801 | 455 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 456 | |
1da177e4 | 457 | /* Search for module by name: must hold module_mutex. */ |
0d21b0e3 RR |
458 | static struct module *find_module_all(const char *name, |
459 | bool even_unformed) | |
1da177e4 LT |
460 | { |
461 | struct module *mod; | |
462 | ||
463 | list_for_each_entry(mod, &modules, list) { | |
0d21b0e3 RR |
464 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
465 | continue; | |
1da177e4 LT |
466 | if (strcmp(mod->name, name) == 0) |
467 | return mod; | |
468 | } | |
469 | return NULL; | |
470 | } | |
0d21b0e3 RR |
471 | |
472 | struct module *find_module(const char *name) | |
473 | { | |
474 | return find_module_all(name, false); | |
475 | } | |
c6b37801 | 476 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
477 | |
478 | #ifdef CONFIG_SMP | |
fbf59bc9 | 479 | |
259354de | 480 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 481 | { |
259354de TH |
482 | return mod->percpu; |
483 | } | |
fbf59bc9 | 484 | |
259354de TH |
485 | static int percpu_modalloc(struct module *mod, |
486 | unsigned long size, unsigned long align) | |
487 | { | |
fbf59bc9 TH |
488 | if (align > PAGE_SIZE) { |
489 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
259354de | 490 | mod->name, align, PAGE_SIZE); |
fbf59bc9 TH |
491 | align = PAGE_SIZE; |
492 | } | |
493 | ||
259354de TH |
494 | mod->percpu = __alloc_reserved_percpu(size, align); |
495 | if (!mod->percpu) { | |
fbf59bc9 | 496 | printk(KERN_WARNING |
d913188c RR |
497 | "%s: Could not allocate %lu bytes percpu data\n", |
498 | mod->name, size); | |
259354de TH |
499 | return -ENOMEM; |
500 | } | |
501 | mod->percpu_size = size; | |
502 | return 0; | |
fbf59bc9 TH |
503 | } |
504 | ||
259354de | 505 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 506 | { |
259354de | 507 | free_percpu(mod->percpu); |
fbf59bc9 TH |
508 | } |
509 | ||
49668688 | 510 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 511 | { |
49668688 | 512 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
513 | } |
514 | ||
259354de TH |
515 | static void percpu_modcopy(struct module *mod, |
516 | const void *from, unsigned long size) | |
6b588c18 TH |
517 | { |
518 | int cpu; | |
519 | ||
520 | for_each_possible_cpu(cpu) | |
259354de | 521 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
522 | } |
523 | ||
10fad5e4 TH |
524 | /** |
525 | * is_module_percpu_address - test whether address is from module static percpu | |
526 | * @addr: address to test | |
527 | * | |
528 | * Test whether @addr belongs to module static percpu area. | |
529 | * | |
530 | * RETURNS: | |
531 | * %true if @addr is from module static percpu area | |
532 | */ | |
533 | bool is_module_percpu_address(unsigned long addr) | |
534 | { | |
535 | struct module *mod; | |
536 | unsigned int cpu; | |
537 | ||
538 | preempt_disable(); | |
539 | ||
540 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
541 | if (mod->state == MODULE_STATE_UNFORMED) |
542 | continue; | |
10fad5e4 TH |
543 | if (!mod->percpu_size) |
544 | continue; | |
545 | for_each_possible_cpu(cpu) { | |
546 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
547 | ||
548 | if ((void *)addr >= start && | |
549 | (void *)addr < start + mod->percpu_size) { | |
550 | preempt_enable(); | |
551 | return true; | |
552 | } | |
553 | } | |
554 | } | |
555 | ||
556 | preempt_enable(); | |
557 | return false; | |
6b588c18 TH |
558 | } |
559 | ||
1da177e4 | 560 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 561 | |
259354de | 562 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
563 | { |
564 | return NULL; | |
565 | } | |
259354de TH |
566 | static inline int percpu_modalloc(struct module *mod, |
567 | unsigned long size, unsigned long align) | |
568 | { | |
569 | return -ENOMEM; | |
570 | } | |
571 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 572 | { |
1da177e4 | 573 | } |
49668688 | 574 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
575 | { |
576 | return 0; | |
577 | } | |
259354de TH |
578 | static inline void percpu_modcopy(struct module *mod, |
579 | const void *from, unsigned long size) | |
1da177e4 LT |
580 | { |
581 | /* pcpusec should be 0, and size of that section should be 0. */ | |
582 | BUG_ON(size != 0); | |
583 | } | |
10fad5e4 TH |
584 | bool is_module_percpu_address(unsigned long addr) |
585 | { | |
586 | return false; | |
587 | } | |
6b588c18 | 588 | |
1da177e4 LT |
589 | #endif /* CONFIG_SMP */ |
590 | ||
c988d2b2 MD |
591 | #define MODINFO_ATTR(field) \ |
592 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
593 | { \ | |
594 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
595 | } \ | |
596 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 597 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 598 | { \ |
4befb026 | 599 | return sprintf(buffer, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
600 | } \ |
601 | static int modinfo_##field##_exists(struct module *mod) \ | |
602 | { \ | |
603 | return mod->field != NULL; \ | |
604 | } \ | |
605 | static void free_modinfo_##field(struct module *mod) \ | |
606 | { \ | |
22a8bdeb DW |
607 | kfree(mod->field); \ |
608 | mod->field = NULL; \ | |
c988d2b2 MD |
609 | } \ |
610 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 611 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
612 | .show = show_modinfo_##field, \ |
613 | .setup = setup_modinfo_##field, \ | |
614 | .test = modinfo_##field##_exists, \ | |
615 | .free = free_modinfo_##field, \ | |
616 | }; | |
617 | ||
618 | MODINFO_ATTR(version); | |
619 | MODINFO_ATTR(srcversion); | |
620 | ||
e14af7ee AV |
621 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
622 | ||
03e88ae1 | 623 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
624 | |
625 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
626 | ||
1da177e4 | 627 | /* Init the unload section of the module. */ |
9f85a4bb | 628 | static int module_unload_init(struct module *mod) |
1da177e4 | 629 | { |
9f85a4bb RR |
630 | mod->refptr = alloc_percpu(struct module_ref); |
631 | if (!mod->refptr) | |
632 | return -ENOMEM; | |
633 | ||
2c02dfe7 LT |
634 | INIT_LIST_HEAD(&mod->source_list); |
635 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 636 | |
1da177e4 | 637 | /* Hold reference count during initialization. */ |
5fbfb18d | 638 | __this_cpu_write(mod->refptr->incs, 1); |
1da177e4 LT |
639 | /* Backwards compatibility macros put refcount during init. */ |
640 | mod->waiter = current; | |
9f85a4bb RR |
641 | |
642 | return 0; | |
1da177e4 LT |
643 | } |
644 | ||
1da177e4 LT |
645 | /* Does a already use b? */ |
646 | static int already_uses(struct module *a, struct module *b) | |
647 | { | |
648 | struct module_use *use; | |
649 | ||
2c02dfe7 LT |
650 | list_for_each_entry(use, &b->source_list, source_list) { |
651 | if (use->source == a) { | |
5e124169 | 652 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
653 | return 1; |
654 | } | |
655 | } | |
5e124169 | 656 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
657 | return 0; |
658 | } | |
659 | ||
2c02dfe7 LT |
660 | /* |
661 | * Module a uses b | |
662 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
663 | * - the module_use is added to the list of 'b' sources (so | |
664 | * 'b' can walk the list to see who sourced them), and of 'a' | |
665 | * targets (so 'a' can see what modules it targets). | |
666 | */ | |
667 | static int add_module_usage(struct module *a, struct module *b) | |
668 | { | |
2c02dfe7 LT |
669 | struct module_use *use; |
670 | ||
5e124169 | 671 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
672 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
673 | if (!use) { | |
674 | printk(KERN_WARNING "%s: out of memory loading\n", a->name); | |
675 | return -ENOMEM; | |
676 | } | |
677 | ||
678 | use->source = a; | |
679 | use->target = b; | |
680 | list_add(&use->source_list, &b->source_list); | |
681 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
682 | return 0; |
683 | } | |
684 | ||
75676500 | 685 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 686 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 687 | { |
c8e21ced | 688 | int err; |
270a6c4c | 689 | |
9bea7f23 | 690 | if (b == NULL || already_uses(a, b)) |
218ce735 | 691 | return 0; |
218ce735 | 692 | |
9bea7f23 RR |
693 | /* If module isn't available, we fail. */ |
694 | err = strong_try_module_get(b); | |
c9a3ba55 | 695 | if (err) |
9bea7f23 | 696 | return err; |
1da177e4 | 697 | |
2c02dfe7 LT |
698 | err = add_module_usage(a, b); |
699 | if (err) { | |
1da177e4 | 700 | module_put(b); |
9bea7f23 | 701 | return err; |
1da177e4 | 702 | } |
9bea7f23 | 703 | return 0; |
1da177e4 | 704 | } |
9bea7f23 | 705 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
706 | |
707 | /* Clear the unload stuff of the module. */ | |
708 | static void module_unload_free(struct module *mod) | |
709 | { | |
2c02dfe7 | 710 | struct module_use *use, *tmp; |
1da177e4 | 711 | |
75676500 | 712 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
713 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
714 | struct module *i = use->target; | |
5e124169 | 715 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
716 | module_put(i); |
717 | list_del(&use->source_list); | |
718 | list_del(&use->target_list); | |
719 | kfree(use); | |
1da177e4 | 720 | } |
75676500 | 721 | mutex_unlock(&module_mutex); |
9f85a4bb RR |
722 | |
723 | free_percpu(mod->refptr); | |
1da177e4 LT |
724 | } |
725 | ||
726 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 727 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
728 | { |
729 | int ret = (flags & O_TRUNC); | |
730 | if (ret) | |
373d4d09 | 731 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
732 | return ret; |
733 | } | |
734 | #else | |
fb169793 | 735 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
736 | { |
737 | return 0; | |
738 | } | |
739 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
740 | ||
741 | struct stopref | |
742 | { | |
743 | struct module *mod; | |
744 | int flags; | |
745 | int *forced; | |
746 | }; | |
747 | ||
748 | /* Whole machine is stopped with interrupts off when this runs. */ | |
749 | static int __try_stop_module(void *_sref) | |
750 | { | |
751 | struct stopref *sref = _sref; | |
752 | ||
da39ba5e RR |
753 | /* If it's not unused, quit unless we're forcing. */ |
754 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 755 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
756 | return -EWOULDBLOCK; |
757 | } | |
758 | ||
759 | /* Mark it as dying. */ | |
760 | sref->mod->state = MODULE_STATE_GOING; | |
761 | return 0; | |
762 | } | |
763 | ||
764 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
765 | { | |
da39ba5e RR |
766 | if (flags & O_NONBLOCK) { |
767 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 768 | |
9b1a4d38 | 769 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
770 | } else { |
771 | /* We don't need to stop the machine for this. */ | |
772 | mod->state = MODULE_STATE_GOING; | |
773 | synchronize_sched(); | |
774 | return 0; | |
775 | } | |
1da177e4 LT |
776 | } |
777 | ||
bd77c047 | 778 | unsigned long module_refcount(struct module *mod) |
1da177e4 | 779 | { |
bd77c047 | 780 | unsigned long incs = 0, decs = 0; |
720eba31 | 781 | int cpu; |
1da177e4 | 782 | |
720eba31 | 783 | for_each_possible_cpu(cpu) |
5fbfb18d NP |
784 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
785 | /* | |
786 | * ensure the incs are added up after the decs. | |
787 | * module_put ensures incs are visible before decs with smp_wmb. | |
788 | * | |
789 | * This 2-count scheme avoids the situation where the refcount | |
790 | * for CPU0 is read, then CPU0 increments the module refcount, | |
791 | * then CPU1 drops that refcount, then the refcount for CPU1 is | |
792 | * read. We would record a decrement but not its corresponding | |
793 | * increment so we would see a low count (disaster). | |
794 | * | |
795 | * Rare situation? But module_refcount can be preempted, and we | |
796 | * might be tallying up 4096+ CPUs. So it is not impossible. | |
797 | */ | |
798 | smp_rmb(); | |
799 | for_each_possible_cpu(cpu) | |
800 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; | |
801 | return incs - decs; | |
1da177e4 LT |
802 | } |
803 | EXPORT_SYMBOL(module_refcount); | |
804 | ||
805 | /* This exists whether we can unload or not */ | |
806 | static void free_module(struct module *mod); | |
807 | ||
808 | static void wait_for_zero_refcount(struct module *mod) | |
809 | { | |
a6550207 | 810 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 811 | mutex_unlock(&module_mutex); |
1da177e4 | 812 | for (;;) { |
5e124169 | 813 | pr_debug("Looking at refcount...\n"); |
1da177e4 LT |
814 | set_current_state(TASK_UNINTERRUPTIBLE); |
815 | if (module_refcount(mod) == 0) | |
816 | break; | |
817 | schedule(); | |
818 | } | |
819 | current->state = TASK_RUNNING; | |
6389a385 | 820 | mutex_lock(&module_mutex); |
1da177e4 LT |
821 | } |
822 | ||
17da2bd9 HC |
823 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
824 | unsigned int, flags) | |
1da177e4 LT |
825 | { |
826 | struct module *mod; | |
dfff0a06 | 827 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
828 | int ret, forced = 0; |
829 | ||
3d43321b | 830 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
831 | return -EPERM; |
832 | ||
833 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
834 | return -EFAULT; | |
835 | name[MODULE_NAME_LEN-1] = '\0'; | |
836 | ||
3fc1f1e2 TH |
837 | if (mutex_lock_interruptible(&module_mutex) != 0) |
838 | return -EINTR; | |
1da177e4 LT |
839 | |
840 | mod = find_module(name); | |
841 | if (!mod) { | |
842 | ret = -ENOENT; | |
843 | goto out; | |
844 | } | |
845 | ||
2c02dfe7 | 846 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
847 | /* Other modules depend on us: get rid of them first. */ |
848 | ret = -EWOULDBLOCK; | |
849 | goto out; | |
850 | } | |
851 | ||
852 | /* Doing init or already dying? */ | |
853 | if (mod->state != MODULE_STATE_LIVE) { | |
854 | /* FIXME: if (force), slam module count and wake up | |
855 | waiter --RR */ | |
5e124169 | 856 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
857 | ret = -EBUSY; |
858 | goto out; | |
859 | } | |
860 | ||
861 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 862 | if (mod->init && !mod->exit) { |
fb169793 | 863 | forced = try_force_unload(flags); |
1da177e4 LT |
864 | if (!forced) { |
865 | /* This module can't be removed */ | |
866 | ret = -EBUSY; | |
867 | goto out; | |
868 | } | |
869 | } | |
870 | ||
871 | /* Set this up before setting mod->state */ | |
872 | mod->waiter = current; | |
873 | ||
874 | /* Stop the machine so refcounts can't move and disable module. */ | |
875 | ret = try_stop_module(mod, flags, &forced); | |
876 | if (ret != 0) | |
877 | goto out; | |
878 | ||
879 | /* Never wait if forced. */ | |
880 | if (!forced && module_refcount(mod) != 0) | |
881 | wait_for_zero_refcount(mod); | |
882 | ||
df4b565e | 883 | mutex_unlock(&module_mutex); |
25985edc | 884 | /* Final destruction now no one is using it. */ |
df4b565e | 885 | if (mod->exit != NULL) |
1da177e4 | 886 | mod->exit(); |
df4b565e PO |
887 | blocking_notifier_call_chain(&module_notify_list, |
888 | MODULE_STATE_GOING, mod); | |
22a9d645 | 889 | async_synchronize_full(); |
75676500 | 890 | |
e14af7ee | 891 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 892 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 893 | |
75676500 RR |
894 | free_module(mod); |
895 | return 0; | |
896 | out: | |
6389a385 | 897 | mutex_unlock(&module_mutex); |
1da177e4 LT |
898 | return ret; |
899 | } | |
900 | ||
d1e99d7a | 901 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
902 | { |
903 | struct module_use *use; | |
904 | int printed_something = 0; | |
905 | ||
bd77c047 | 906 | seq_printf(m, " %lu ", module_refcount(mod)); |
1da177e4 LT |
907 | |
908 | /* Always include a trailing , so userspace can differentiate | |
909 | between this and the old multi-field proc format. */ | |
2c02dfe7 | 910 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 911 | printed_something = 1; |
2c02dfe7 | 912 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
913 | } |
914 | ||
1da177e4 LT |
915 | if (mod->init != NULL && mod->exit == NULL) { |
916 | printed_something = 1; | |
917 | seq_printf(m, "[permanent],"); | |
918 | } | |
919 | ||
920 | if (!printed_something) | |
921 | seq_printf(m, "-"); | |
922 | } | |
923 | ||
924 | void __symbol_put(const char *symbol) | |
925 | { | |
926 | struct module *owner; | |
1da177e4 | 927 | |
24da1cbf | 928 | preempt_disable(); |
414fd31b | 929 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
930 | BUG(); |
931 | module_put(owner); | |
24da1cbf | 932 | preempt_enable(); |
1da177e4 LT |
933 | } |
934 | EXPORT_SYMBOL(__symbol_put); | |
935 | ||
7d1d16e4 | 936 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
937 | void symbol_put_addr(void *addr) |
938 | { | |
5e376613 | 939 | struct module *modaddr; |
7d1d16e4 | 940 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 941 | |
7d1d16e4 | 942 | if (core_kernel_text(a)) |
5e376613 | 943 | return; |
1da177e4 | 944 | |
a6e6abd5 RR |
945 | /* module_text_address is safe here: we're supposed to have reference |
946 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 947 | modaddr = __module_text_address(a); |
a6e6abd5 | 948 | BUG_ON(!modaddr); |
5e376613 | 949 | module_put(modaddr); |
1da177e4 LT |
950 | } |
951 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
952 | ||
953 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 954 | struct module_kobject *mk, char *buffer) |
1da177e4 | 955 | { |
bd77c047 | 956 | return sprintf(buffer, "%lu\n", module_refcount(mk->mod)); |
1da177e4 LT |
957 | } |
958 | ||
cca3e707 KS |
959 | static struct module_attribute modinfo_refcnt = |
960 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 961 | |
d53799be SR |
962 | void __module_get(struct module *module) |
963 | { | |
964 | if (module) { | |
965 | preempt_disable(); | |
966 | __this_cpu_inc(module->refptr->incs); | |
967 | trace_module_get(module, _RET_IP_); | |
968 | preempt_enable(); | |
969 | } | |
970 | } | |
971 | EXPORT_SYMBOL(__module_get); | |
972 | ||
973 | bool try_module_get(struct module *module) | |
974 | { | |
975 | bool ret = true; | |
976 | ||
977 | if (module) { | |
978 | preempt_disable(); | |
979 | ||
980 | if (likely(module_is_live(module))) { | |
981 | __this_cpu_inc(module->refptr->incs); | |
982 | trace_module_get(module, _RET_IP_); | |
983 | } else | |
984 | ret = false; | |
985 | ||
986 | preempt_enable(); | |
987 | } | |
988 | return ret; | |
989 | } | |
990 | EXPORT_SYMBOL(try_module_get); | |
991 | ||
f6a57033 AV |
992 | void module_put(struct module *module) |
993 | { | |
994 | if (module) { | |
e1783a24 | 995 | preempt_disable(); |
5fbfb18d NP |
996 | smp_wmb(); /* see comment in module_refcount */ |
997 | __this_cpu_inc(module->refptr->decs); | |
e1783a24 | 998 | |
ae832d1e | 999 | trace_module_put(module, _RET_IP_); |
f6a57033 AV |
1000 | /* Maybe they're waiting for us to drop reference? */ |
1001 | if (unlikely(!module_is_live(module))) | |
1002 | wake_up_process(module->waiter); | |
e1783a24 | 1003 | preempt_enable(); |
f6a57033 AV |
1004 | } |
1005 | } | |
1006 | EXPORT_SYMBOL(module_put); | |
1007 | ||
1da177e4 | 1008 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1009 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1010 | { |
1011 | /* We don't know the usage count, or what modules are using. */ | |
1012 | seq_printf(m, " - -"); | |
1013 | } | |
1014 | ||
1015 | static inline void module_unload_free(struct module *mod) | |
1016 | { | |
1017 | } | |
1018 | ||
9bea7f23 | 1019 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1020 | { |
9bea7f23 | 1021 | return strong_try_module_get(b); |
1da177e4 | 1022 | } |
9bea7f23 | 1023 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1024 | |
9f85a4bb | 1025 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1026 | { |
9f85a4bb | 1027 | return 0; |
1da177e4 LT |
1028 | } |
1029 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1030 | ||
53999bf3 KW |
1031 | static size_t module_flags_taint(struct module *mod, char *buf) |
1032 | { | |
1033 | size_t l = 0; | |
1034 | ||
1035 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) | |
1036 | buf[l++] = 'P'; | |
1037 | if (mod->taints & (1 << TAINT_OOT_MODULE)) | |
1038 | buf[l++] = 'O'; | |
1039 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) | |
1040 | buf[l++] = 'F'; | |
1041 | if (mod->taints & (1 << TAINT_CRAP)) | |
1042 | buf[l++] = 'C'; | |
1043 | /* | |
1044 | * TAINT_FORCED_RMMOD: could be added. | |
1045 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
1046 | * apply to modules. | |
1047 | */ | |
1048 | return l; | |
1049 | } | |
1050 | ||
1f71740a | 1051 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1052 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1053 | { |
1054 | const char *state = "unknown"; | |
1055 | ||
4befb026 | 1056 | switch (mk->mod->state) { |
1f71740a KS |
1057 | case MODULE_STATE_LIVE: |
1058 | state = "live"; | |
1059 | break; | |
1060 | case MODULE_STATE_COMING: | |
1061 | state = "coming"; | |
1062 | break; | |
1063 | case MODULE_STATE_GOING: | |
1064 | state = "going"; | |
1065 | break; | |
0d21b0e3 RR |
1066 | default: |
1067 | BUG(); | |
1f71740a KS |
1068 | } |
1069 | return sprintf(buffer, "%s\n", state); | |
1070 | } | |
1071 | ||
cca3e707 KS |
1072 | static struct module_attribute modinfo_initstate = |
1073 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1074 | |
88bfa324 KS |
1075 | static ssize_t store_uevent(struct module_attribute *mattr, |
1076 | struct module_kobject *mk, | |
1077 | const char *buffer, size_t count) | |
1078 | { | |
1079 | enum kobject_action action; | |
1080 | ||
1081 | if (kobject_action_type(buffer, count, &action) == 0) | |
1082 | kobject_uevent(&mk->kobj, action); | |
1083 | return count; | |
1084 | } | |
1085 | ||
cca3e707 KS |
1086 | struct module_attribute module_uevent = |
1087 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1088 | ||
1089 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1090 | struct module_kobject *mk, char *buffer) | |
1091 | { | |
1092 | return sprintf(buffer, "%u\n", mk->mod->core_size); | |
1093 | } | |
1094 | ||
1095 | static struct module_attribute modinfo_coresize = | |
1096 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1097 | ||
1098 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1099 | struct module_kobject *mk, char *buffer) | |
1100 | { | |
1101 | return sprintf(buffer, "%u\n", mk->mod->init_size); | |
1102 | } | |
1103 | ||
1104 | static struct module_attribute modinfo_initsize = | |
1105 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1106 | ||
1107 | static ssize_t show_taint(struct module_attribute *mattr, | |
1108 | struct module_kobject *mk, char *buffer) | |
1109 | { | |
1110 | size_t l; | |
1111 | ||
1112 | l = module_flags_taint(mk->mod, buffer); | |
1113 | buffer[l++] = '\n'; | |
1114 | return l; | |
1115 | } | |
1116 | ||
1117 | static struct module_attribute modinfo_taint = | |
1118 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1119 | |
03e88ae1 | 1120 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1121 | &module_uevent, |
03e88ae1 GKH |
1122 | &modinfo_version, |
1123 | &modinfo_srcversion, | |
cca3e707 KS |
1124 | &modinfo_initstate, |
1125 | &modinfo_coresize, | |
1126 | &modinfo_initsize, | |
1127 | &modinfo_taint, | |
03e88ae1 | 1128 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1129 | &modinfo_refcnt, |
03e88ae1 GKH |
1130 | #endif |
1131 | NULL, | |
1132 | }; | |
1133 | ||
1da177e4 LT |
1134 | static const char vermagic[] = VERMAGIC_STRING; |
1135 | ||
c6e665c8 | 1136 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1137 | { |
1138 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1139 | if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8 RR |
1140 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
1141 | mod->name, reason); | |
373d4d09 | 1142 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1143 | return 0; |
1144 | #else | |
1145 | return -ENOEXEC; | |
1146 | #endif | |
1147 | } | |
1148 | ||
1da177e4 | 1149 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
1150 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1151 | static unsigned long maybe_relocated(unsigned long crc, | |
1152 | const struct module *crc_owner) | |
1153 | { | |
1154 | #ifdef ARCH_RELOCATES_KCRCTAB | |
1155 | if (crc_owner == NULL) | |
1156 | return crc - (unsigned long)reloc_start; | |
1157 | #endif | |
1158 | return crc; | |
1159 | } | |
1160 | ||
1da177e4 LT |
1161 | static int check_version(Elf_Shdr *sechdrs, |
1162 | unsigned int versindex, | |
1163 | const char *symname, | |
1164 | struct module *mod, | |
d4703aef RR |
1165 | const unsigned long *crc, |
1166 | const struct module *crc_owner) | |
1da177e4 LT |
1167 | { |
1168 | unsigned int i, num_versions; | |
1169 | struct modversion_info *versions; | |
1170 | ||
1171 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1172 | if (!crc) | |
1173 | return 1; | |
1174 | ||
a5dd6970 RR |
1175 | /* No versions at all? modprobe --force does this. */ |
1176 | if (versindex == 0) | |
1177 | return try_to_force_load(mod, symname) == 0; | |
1178 | ||
1da177e4 LT |
1179 | versions = (void *) sechdrs[versindex].sh_addr; |
1180 | num_versions = sechdrs[versindex].sh_size | |
1181 | / sizeof(struct modversion_info); | |
1182 | ||
1183 | for (i = 0; i < num_versions; i++) { | |
1184 | if (strcmp(versions[i].name, symname) != 0) | |
1185 | continue; | |
1186 | ||
d4703aef | 1187 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1188 | return 1; |
5e124169 | 1189 | pr_debug("Found checksum %lX vs module %lX\n", |
d4703aef | 1190 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1191 | goto bad_version; |
1da177e4 | 1192 | } |
826e4506 | 1193 | |
a5dd6970 RR |
1194 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1195 | mod->name, symname); | |
1196 | return 0; | |
826e4506 LT |
1197 | |
1198 | bad_version: | |
1199 | printk("%s: disagrees about version of symbol %s\n", | |
1200 | mod->name, symname); | |
1201 | return 0; | |
1da177e4 LT |
1202 | } |
1203 | ||
1204 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1205 | unsigned int versindex, | |
1206 | struct module *mod) | |
1207 | { | |
1208 | const unsigned long *crc; | |
1da177e4 | 1209 | |
75676500 RR |
1210 | /* Since this should be found in kernel (which can't be removed), |
1211 | * no locking is necessary. */ | |
b92021b0 | 1212 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
6560dc16 | 1213 | &crc, true, false)) |
1da177e4 | 1214 | BUG(); |
a4b6a77b JH |
1215 | return check_version(sechdrs, versindex, |
1216 | VMLINUX_SYMBOL_STR(module_layout), mod, crc, | |
d4703aef | 1217 | NULL); |
1da177e4 LT |
1218 | } |
1219 | ||
91e37a79 RR |
1220 | /* First part is kernel version, which we ignore if module has crcs. */ |
1221 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1222 | bool has_crcs) | |
1da177e4 | 1223 | { |
91e37a79 RR |
1224 | if (has_crcs) { |
1225 | amagic += strcspn(amagic, " "); | |
1226 | bmagic += strcspn(bmagic, " "); | |
1227 | } | |
1da177e4 LT |
1228 | return strcmp(amagic, bmagic) == 0; |
1229 | } | |
1230 | #else | |
1231 | static inline int check_version(Elf_Shdr *sechdrs, | |
1232 | unsigned int versindex, | |
1233 | const char *symname, | |
1234 | struct module *mod, | |
d4703aef RR |
1235 | const unsigned long *crc, |
1236 | const struct module *crc_owner) | |
1da177e4 LT |
1237 | { |
1238 | return 1; | |
1239 | } | |
1240 | ||
1241 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1242 | unsigned int versindex, | |
1243 | struct module *mod) | |
1244 | { | |
1245 | return 1; | |
1246 | } | |
1247 | ||
91e37a79 RR |
1248 | static inline int same_magic(const char *amagic, const char *bmagic, |
1249 | bool has_crcs) | |
1da177e4 LT |
1250 | { |
1251 | return strcmp(amagic, bmagic) == 0; | |
1252 | } | |
1253 | #endif /* CONFIG_MODVERSIONS */ | |
1254 | ||
75676500 | 1255 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1256 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1257 | const struct load_info *info, | |
414fd31b | 1258 | const char *name, |
9bea7f23 | 1259 | char ownername[]) |
1da177e4 LT |
1260 | { |
1261 | struct module *owner; | |
414fd31b | 1262 | const struct kernel_symbol *sym; |
1da177e4 | 1263 | const unsigned long *crc; |
9bea7f23 | 1264 | int err; |
1da177e4 | 1265 | |
75676500 | 1266 | mutex_lock(&module_mutex); |
414fd31b | 1267 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1268 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1269 | if (!sym) |
1270 | goto unlock; | |
1271 | ||
49668688 RR |
1272 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1273 | owner)) { | |
9bea7f23 RR |
1274 | sym = ERR_PTR(-EINVAL); |
1275 | goto getname; | |
1da177e4 | 1276 | } |
9bea7f23 RR |
1277 | |
1278 | err = ref_module(mod, owner); | |
1279 | if (err) { | |
1280 | sym = ERR_PTR(err); | |
1281 | goto getname; | |
1282 | } | |
1283 | ||
1284 | getname: | |
1285 | /* We must make copy under the lock if we failed to get ref. */ | |
1286 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1287 | unlock: | |
75676500 | 1288 | mutex_unlock(&module_mutex); |
218ce735 | 1289 | return sym; |
1da177e4 LT |
1290 | } |
1291 | ||
49668688 RR |
1292 | static const struct kernel_symbol * |
1293 | resolve_symbol_wait(struct module *mod, | |
1294 | const struct load_info *info, | |
1295 | const char *name) | |
9bea7f23 RR |
1296 | { |
1297 | const struct kernel_symbol *ksym; | |
49668688 | 1298 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1299 | |
1300 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1301 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1302 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 RR |
1303 | 30 * HZ) <= 0) { |
1304 | printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n", | |
49668688 | 1305 | mod->name, owner); |
9bea7f23 RR |
1306 | } |
1307 | return ksym; | |
1308 | } | |
1309 | ||
1da177e4 LT |
1310 | /* |
1311 | * /sys/module/foo/sections stuff | |
1312 | * J. Corbet <corbet@lwn.net> | |
1313 | */ | |
8f6d0378 | 1314 | #ifdef CONFIG_SYSFS |
10b465aa | 1315 | |
8f6d0378 | 1316 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1317 | static inline bool sect_empty(const Elf_Shdr *sect) |
1318 | { | |
1319 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1320 | } | |
1321 | ||
a58730c4 RR |
1322 | struct module_sect_attr |
1323 | { | |
1324 | struct module_attribute mattr; | |
1325 | char *name; | |
1326 | unsigned long address; | |
1327 | }; | |
1328 | ||
1329 | struct module_sect_attrs | |
1330 | { | |
1331 | struct attribute_group grp; | |
1332 | unsigned int nsections; | |
1333 | struct module_sect_attr attrs[0]; | |
1334 | }; | |
1335 | ||
1da177e4 | 1336 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1337 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1338 | { |
1339 | struct module_sect_attr *sattr = | |
1340 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1341 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1342 | } |
1343 | ||
04b1db9f IN |
1344 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1345 | { | |
a58730c4 | 1346 | unsigned int section; |
04b1db9f IN |
1347 | |
1348 | for (section = 0; section < sect_attrs->nsections; section++) | |
1349 | kfree(sect_attrs->attrs[section].name); | |
1350 | kfree(sect_attrs); | |
1351 | } | |
1352 | ||
8f6d0378 | 1353 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1354 | { |
1355 | unsigned int nloaded = 0, i, size[2]; | |
1356 | struct module_sect_attrs *sect_attrs; | |
1357 | struct module_sect_attr *sattr; | |
1358 | struct attribute **gattr; | |
22a8bdeb | 1359 | |
1da177e4 | 1360 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1361 | for (i = 0; i < info->hdr->e_shnum; i++) |
1362 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1363 | nloaded++; |
1364 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1365 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1366 | sizeof(sect_attrs->grp.attrs[0])); | |
1367 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1368 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1369 | if (sect_attrs == NULL) | |
1da177e4 LT |
1370 | return; |
1371 | ||
1372 | /* Setup section attributes. */ | |
1373 | sect_attrs->grp.name = "sections"; | |
1374 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1375 | ||
04b1db9f | 1376 | sect_attrs->nsections = 0; |
1da177e4 LT |
1377 | sattr = §_attrs->attrs[0]; |
1378 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1379 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1380 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1381 | if (sect_empty(sec)) | |
35dead42 | 1382 | continue; |
8f6d0378 RR |
1383 | sattr->address = sec->sh_addr; |
1384 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1385 | GFP_KERNEL); |
1386 | if (sattr->name == NULL) | |
1387 | goto out; | |
1388 | sect_attrs->nsections++; | |
361795b1 | 1389 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1390 | sattr->mattr.show = module_sect_show; |
1391 | sattr->mattr.store = NULL; | |
1392 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1393 | sattr->mattr.attr.mode = S_IRUGO; |
1394 | *(gattr++) = &(sattr++)->mattr.attr; | |
1395 | } | |
1396 | *gattr = NULL; | |
1397 | ||
1398 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1399 | goto out; | |
1400 | ||
1401 | mod->sect_attrs = sect_attrs; | |
1402 | return; | |
1403 | out: | |
04b1db9f | 1404 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1405 | } |
1406 | ||
1407 | static void remove_sect_attrs(struct module *mod) | |
1408 | { | |
1409 | if (mod->sect_attrs) { | |
1410 | sysfs_remove_group(&mod->mkobj.kobj, | |
1411 | &mod->sect_attrs->grp); | |
1412 | /* We are positive that no one is using any sect attrs | |
1413 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1414 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1415 | mod->sect_attrs = NULL; |
1416 | } | |
1417 | } | |
1418 | ||
6d760133 RM |
1419 | /* |
1420 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1421 | */ | |
1422 | ||
1423 | struct module_notes_attrs { | |
1424 | struct kobject *dir; | |
1425 | unsigned int notes; | |
1426 | struct bin_attribute attrs[0]; | |
1427 | }; | |
1428 | ||
2c3c8bea | 1429 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1430 | struct bin_attribute *bin_attr, |
1431 | char *buf, loff_t pos, size_t count) | |
1432 | { | |
1433 | /* | |
1434 | * The caller checked the pos and count against our size. | |
1435 | */ | |
1436 | memcpy(buf, bin_attr->private + pos, count); | |
1437 | return count; | |
1438 | } | |
1439 | ||
1440 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1441 | unsigned int i) | |
1442 | { | |
1443 | if (notes_attrs->dir) { | |
1444 | while (i-- > 0) | |
1445 | sysfs_remove_bin_file(notes_attrs->dir, | |
1446 | ¬es_attrs->attrs[i]); | |
e9432093 | 1447 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1448 | } |
1449 | kfree(notes_attrs); | |
1450 | } | |
1451 | ||
8f6d0378 | 1452 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1453 | { |
1454 | unsigned int notes, loaded, i; | |
1455 | struct module_notes_attrs *notes_attrs; | |
1456 | struct bin_attribute *nattr; | |
1457 | ||
ea6bff36 IM |
1458 | /* failed to create section attributes, so can't create notes */ |
1459 | if (!mod->sect_attrs) | |
1460 | return; | |
1461 | ||
6d760133 RM |
1462 | /* Count notes sections and allocate structures. */ |
1463 | notes = 0; | |
8f6d0378 RR |
1464 | for (i = 0; i < info->hdr->e_shnum; i++) |
1465 | if (!sect_empty(&info->sechdrs[i]) && | |
1466 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1467 | ++notes; |
1468 | ||
1469 | if (notes == 0) | |
1470 | return; | |
1471 | ||
1472 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1473 | + notes * sizeof(notes_attrs->attrs[0]), | |
1474 | GFP_KERNEL); | |
1475 | if (notes_attrs == NULL) | |
1476 | return; | |
1477 | ||
1478 | notes_attrs->notes = notes; | |
1479 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1480 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1481 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1482 | continue; |
8f6d0378 | 1483 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1484 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1485 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1486 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1487 | nattr->size = info->sechdrs[i].sh_size; |
1488 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1489 | nattr->read = module_notes_read; |
1490 | ++nattr; | |
1491 | } | |
1492 | ++loaded; | |
1493 | } | |
1494 | ||
4ff6abff | 1495 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1496 | if (!notes_attrs->dir) |
1497 | goto out; | |
1498 | ||
1499 | for (i = 0; i < notes; ++i) | |
1500 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1501 | ¬es_attrs->attrs[i])) | |
1502 | goto out; | |
1503 | ||
1504 | mod->notes_attrs = notes_attrs; | |
1505 | return; | |
1506 | ||
1507 | out: | |
1508 | free_notes_attrs(notes_attrs, i); | |
1509 | } | |
1510 | ||
1511 | static void remove_notes_attrs(struct module *mod) | |
1512 | { | |
1513 | if (mod->notes_attrs) | |
1514 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1515 | } | |
1516 | ||
1da177e4 | 1517 | #else |
04b1db9f | 1518 | |
8f6d0378 RR |
1519 | static inline void add_sect_attrs(struct module *mod, |
1520 | const struct load_info *info) | |
1da177e4 LT |
1521 | { |
1522 | } | |
1523 | ||
1524 | static inline void remove_sect_attrs(struct module *mod) | |
1525 | { | |
1526 | } | |
6d760133 | 1527 | |
8f6d0378 RR |
1528 | static inline void add_notes_attrs(struct module *mod, |
1529 | const struct load_info *info) | |
6d760133 RM |
1530 | { |
1531 | } | |
1532 | ||
1533 | static inline void remove_notes_attrs(struct module *mod) | |
1534 | { | |
1535 | } | |
8f6d0378 | 1536 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1537 | |
80a3d1bb RR |
1538 | static void add_usage_links(struct module *mod) |
1539 | { | |
1540 | #ifdef CONFIG_MODULE_UNLOAD | |
1541 | struct module_use *use; | |
1542 | int nowarn; | |
1543 | ||
75676500 | 1544 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1545 | list_for_each_entry(use, &mod->target_list, target_list) { |
1546 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1547 | &mod->mkobj.kobj, mod->name); | |
1548 | } | |
75676500 | 1549 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1550 | #endif |
1551 | } | |
1552 | ||
1553 | static void del_usage_links(struct module *mod) | |
1554 | { | |
1555 | #ifdef CONFIG_MODULE_UNLOAD | |
1556 | struct module_use *use; | |
1557 | ||
75676500 | 1558 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1559 | list_for_each_entry(use, &mod->target_list, target_list) |
1560 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1561 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1562 | #endif |
1563 | } | |
1564 | ||
6407ebb2 | 1565 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1566 | { |
1567 | struct module_attribute *attr; | |
03e88ae1 | 1568 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1569 | int error = 0; |
1570 | int i; | |
1571 | ||
03e88ae1 GKH |
1572 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1573 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1574 | GFP_KERNEL); | |
1575 | if (!mod->modinfo_attrs) | |
1576 | return -ENOMEM; | |
1577 | ||
1578 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1579 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1580 | if (!attr->test || | |
03e88ae1 GKH |
1581 | (attr->test && attr->test(mod))) { |
1582 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1583 | sysfs_attr_init(&temp_attr->attr); |
03e88ae1 GKH |
1584 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1585 | ++temp_attr; | |
1586 | } | |
c988d2b2 MD |
1587 | } |
1588 | return error; | |
1589 | } | |
1590 | ||
6407ebb2 | 1591 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1592 | { |
1593 | struct module_attribute *attr; | |
1594 | int i; | |
1595 | ||
03e88ae1 GKH |
1596 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1597 | /* pick a field to test for end of list */ | |
1598 | if (!attr->attr.name) | |
1599 | break; | |
c988d2b2 | 1600 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1601 | if (attr->free) |
1602 | attr->free(mod); | |
c988d2b2 | 1603 | } |
03e88ae1 | 1604 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1605 | } |
1da177e4 | 1606 | |
6407ebb2 | 1607 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1608 | { |
1609 | int err; | |
6494a93d | 1610 | struct kobject *kobj; |
1da177e4 | 1611 | |
823bccfc GKH |
1612 | if (!module_sysfs_initialized) { |
1613 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1614 | mod->name); |
1615 | err = -EINVAL; | |
1616 | goto out; | |
1617 | } | |
6494a93d GKH |
1618 | |
1619 | kobj = kset_find_obj(module_kset, mod->name); | |
1620 | if (kobj) { | |
1621 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1622 | kobject_put(kobj); | |
1623 | err = -EINVAL; | |
1624 | goto out; | |
1625 | } | |
1626 | ||
1da177e4 | 1627 | mod->mkobj.mod = mod; |
e17e0f51 | 1628 | |
ac3c8141 GKH |
1629 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1630 | mod->mkobj.kobj.kset = module_kset; | |
1631 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1632 | "%s", mod->name); | |
1633 | if (err) | |
1634 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1635 | |
97c146ef | 1636 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1637 | out: |
1638 | return err; | |
1639 | } | |
1640 | ||
6407ebb2 | 1641 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1642 | const struct load_info *info, |
270a6c4c KS |
1643 | struct kernel_param *kparam, |
1644 | unsigned int num_params) | |
1645 | { | |
1646 | int err; | |
1647 | ||
80a3d1bb RR |
1648 | err = mod_sysfs_init(mod); |
1649 | if (err) | |
1650 | goto out; | |
1651 | ||
4ff6abff | 1652 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1653 | if (!mod->holders_dir) { |
1654 | err = -ENOMEM; | |
270a6c4c | 1655 | goto out_unreg; |
240936e1 | 1656 | } |
270a6c4c | 1657 | |
1da177e4 LT |
1658 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1659 | if (err) | |
270a6c4c | 1660 | goto out_unreg_holders; |
1da177e4 | 1661 | |
c988d2b2 MD |
1662 | err = module_add_modinfo_attrs(mod); |
1663 | if (err) | |
e17e0f51 | 1664 | goto out_unreg_param; |
c988d2b2 | 1665 | |
80a3d1bb | 1666 | add_usage_links(mod); |
8f6d0378 RR |
1667 | add_sect_attrs(mod, info); |
1668 | add_notes_attrs(mod, info); | |
80a3d1bb | 1669 | |
e17e0f51 | 1670 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1671 | return 0; |
1672 | ||
e17e0f51 KS |
1673 | out_unreg_param: |
1674 | module_param_sysfs_remove(mod); | |
270a6c4c | 1675 | out_unreg_holders: |
78a2d906 | 1676 | kobject_put(mod->holders_dir); |
270a6c4c | 1677 | out_unreg: |
e17e0f51 | 1678 | kobject_put(&mod->mkobj.kobj); |
80a3d1bb | 1679 | out: |
1da177e4 LT |
1680 | return err; |
1681 | } | |
34e4e2fe DL |
1682 | |
1683 | static void mod_sysfs_fini(struct module *mod) | |
1684 | { | |
8f6d0378 RR |
1685 | remove_notes_attrs(mod); |
1686 | remove_sect_attrs(mod); | |
34e4e2fe DL |
1687 | kobject_put(&mod->mkobj.kobj); |
1688 | } | |
1689 | ||
8f6d0378 | 1690 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1691 | |
8f6d0378 RR |
1692 | static int mod_sysfs_setup(struct module *mod, |
1693 | const struct load_info *info, | |
6407ebb2 RR |
1694 | struct kernel_param *kparam, |
1695 | unsigned int num_params) | |
1696 | { | |
1697 | return 0; | |
1698 | } | |
1699 | ||
34e4e2fe DL |
1700 | static void mod_sysfs_fini(struct module *mod) |
1701 | { | |
1702 | } | |
1703 | ||
36b0360d RR |
1704 | static void module_remove_modinfo_attrs(struct module *mod) |
1705 | { | |
1706 | } | |
1707 | ||
80a3d1bb RR |
1708 | static void del_usage_links(struct module *mod) |
1709 | { | |
1710 | } | |
1711 | ||
34e4e2fe | 1712 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1713 | |
36b0360d | 1714 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1715 | { |
80a3d1bb | 1716 | del_usage_links(mod); |
c988d2b2 | 1717 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1718 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1719 | kobject_put(mod->mkobj.drivers_dir); |
1720 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1721 | mod_sysfs_fini(mod); |
1da177e4 LT |
1722 | } |
1723 | ||
1724 | /* | |
1725 | * unlink the module with the whole machine is stopped with interrupts off | |
1726 | * - this defends against kallsyms not taking locks | |
1727 | */ | |
1728 | static int __unlink_module(void *_mod) | |
1729 | { | |
1730 | struct module *mod = _mod; | |
1731 | list_del(&mod->list); | |
5336377d | 1732 | module_bug_cleanup(mod); |
1da177e4 LT |
1733 | return 0; |
1734 | } | |
1735 | ||
84e1c6bb MC |
1736 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1737 | /* | |
1738 | * LKM RO/NX protection: protect module's text/ro-data | |
1739 | * from modification and any data from execution. | |
1740 | */ | |
1741 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) | |
1742 | { | |
1743 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); | |
1744 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); | |
1745 | ||
1746 | if (end_pfn > begin_pfn) | |
1747 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1748 | } | |
1749 | ||
1750 | static void set_section_ro_nx(void *base, | |
1751 | unsigned long text_size, | |
1752 | unsigned long ro_size, | |
1753 | unsigned long total_size) | |
1754 | { | |
1755 | /* begin and end PFNs of the current subsection */ | |
1756 | unsigned long begin_pfn; | |
1757 | unsigned long end_pfn; | |
1758 | ||
1759 | /* | |
1760 | * Set RO for module text and RO-data: | |
1761 | * - Always protect first page. | |
1762 | * - Do not protect last partial page. | |
1763 | */ | |
1764 | if (ro_size > 0) | |
1765 | set_page_attributes(base, base + ro_size, set_memory_ro); | |
1766 | ||
1767 | /* | |
1768 | * Set NX permissions for module data: | |
1769 | * - Do not protect first partial page. | |
1770 | * - Always protect last page. | |
1771 | */ | |
1772 | if (total_size > text_size) { | |
1773 | begin_pfn = PFN_UP((unsigned long)base + text_size); | |
1774 | end_pfn = PFN_UP((unsigned long)base + total_size); | |
1775 | if (end_pfn > begin_pfn) | |
1776 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1777 | } | |
1778 | } | |
1779 | ||
01526ed0 JG |
1780 | static void unset_module_core_ro_nx(struct module *mod) |
1781 | { | |
1782 | set_page_attributes(mod->module_core + mod->core_text_size, | |
1783 | mod->module_core + mod->core_size, | |
1784 | set_memory_x); | |
1785 | set_page_attributes(mod->module_core, | |
1786 | mod->module_core + mod->core_ro_size, | |
1787 | set_memory_rw); | |
1788 | } | |
1789 | ||
1790 | static void unset_module_init_ro_nx(struct module *mod) | |
1791 | { | |
1792 | set_page_attributes(mod->module_init + mod->init_text_size, | |
1793 | mod->module_init + mod->init_size, | |
1794 | set_memory_x); | |
1795 | set_page_attributes(mod->module_init, | |
1796 | mod->module_init + mod->init_ro_size, | |
1797 | set_memory_rw); | |
84e1c6bb MC |
1798 | } |
1799 | ||
1800 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1801 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
1802 | { |
1803 | struct module *mod; | |
1804 | ||
1805 | mutex_lock(&module_mutex); | |
1806 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1807 | if (mod->state == MODULE_STATE_UNFORMED) |
1808 | continue; | |
84e1c6bb MC |
1809 | if ((mod->module_core) && (mod->core_text_size)) { |
1810 | set_page_attributes(mod->module_core, | |
1811 | mod->module_core + mod->core_text_size, | |
1812 | set_memory_rw); | |
1813 | } | |
1814 | if ((mod->module_init) && (mod->init_text_size)) { | |
1815 | set_page_attributes(mod->module_init, | |
1816 | mod->module_init + mod->init_text_size, | |
1817 | set_memory_rw); | |
1818 | } | |
1819 | } | |
1820 | mutex_unlock(&module_mutex); | |
1821 | } | |
1822 | ||
1823 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1824 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
1825 | { |
1826 | struct module *mod; | |
1827 | ||
1828 | mutex_lock(&module_mutex); | |
1829 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1830 | if (mod->state == MODULE_STATE_UNFORMED) |
1831 | continue; | |
84e1c6bb MC |
1832 | if ((mod->module_core) && (mod->core_text_size)) { |
1833 | set_page_attributes(mod->module_core, | |
1834 | mod->module_core + mod->core_text_size, | |
1835 | set_memory_ro); | |
1836 | } | |
1837 | if ((mod->module_init) && (mod->init_text_size)) { | |
1838 | set_page_attributes(mod->module_init, | |
1839 | mod->module_init + mod->init_text_size, | |
1840 | set_memory_ro); | |
1841 | } | |
1842 | } | |
1843 | mutex_unlock(&module_mutex); | |
1844 | } | |
1845 | #else | |
1846 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } | |
01526ed0 JG |
1847 | static void unset_module_core_ro_nx(struct module *mod) { } |
1848 | static void unset_module_init_ro_nx(struct module *mod) { } | |
84e1c6bb MC |
1849 | #endif |
1850 | ||
74e08fcf JB |
1851 | void __weak module_free(struct module *mod, void *module_region) |
1852 | { | |
1853 | vfree(module_region); | |
1854 | } | |
1855 | ||
1856 | void __weak module_arch_cleanup(struct module *mod) | |
1857 | { | |
1858 | } | |
1859 | ||
75676500 | 1860 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1861 | static void free_module(struct module *mod) |
1862 | { | |
7ead8b83 LZ |
1863 | trace_module_free(mod); |
1864 | ||
36b0360d | 1865 | mod_sysfs_teardown(mod); |
1da177e4 | 1866 | |
944a1fa0 RR |
1867 | /* We leave it in list to prevent duplicate loads, but make sure |
1868 | * that noone uses it while it's being deconstructed. */ | |
1869 | mod->state = MODULE_STATE_UNFORMED; | |
1870 | ||
b82bab4b JB |
1871 | /* Remove dynamic debug info */ |
1872 | ddebug_remove_module(mod->name); | |
1873 | ||
1da177e4 LT |
1874 | /* Arch-specific cleanup. */ |
1875 | module_arch_cleanup(mod); | |
1876 | ||
1877 | /* Module unload stuff */ | |
1878 | module_unload_free(mod); | |
1879 | ||
e180a6b7 RR |
1880 | /* Free any allocated parameters. */ |
1881 | destroy_params(mod->kp, mod->num_kp); | |
1882 | ||
944a1fa0 RR |
1883 | /* Now we can delete it from the lists */ |
1884 | mutex_lock(&module_mutex); | |
1885 | stop_machine(__unlink_module, mod, NULL); | |
1886 | mutex_unlock(&module_mutex); | |
1887 | ||
1da177e4 | 1888 | /* This may be NULL, but that's OK */ |
01526ed0 | 1889 | unset_module_init_ro_nx(mod); |
1da177e4 LT |
1890 | module_free(mod, mod->module_init); |
1891 | kfree(mod->args); | |
259354de | 1892 | percpu_modfree(mod); |
9f85a4bb | 1893 | |
fbb9ce95 IM |
1894 | /* Free lock-classes: */ |
1895 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1896 | ||
1da177e4 | 1897 | /* Finally, free the core (containing the module structure) */ |
01526ed0 | 1898 | unset_module_core_ro_nx(mod); |
1da177e4 | 1899 | module_free(mod, mod->module_core); |
eb8cdec4 BS |
1900 | |
1901 | #ifdef CONFIG_MPU | |
1902 | update_protections(current->mm); | |
1903 | #endif | |
1da177e4 LT |
1904 | } |
1905 | ||
1906 | void *__symbol_get(const char *symbol) | |
1907 | { | |
1908 | struct module *owner; | |
414fd31b | 1909 | const struct kernel_symbol *sym; |
1da177e4 | 1910 | |
24da1cbf | 1911 | preempt_disable(); |
414fd31b TA |
1912 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1913 | if (sym && strong_try_module_get(owner)) | |
1914 | sym = NULL; | |
24da1cbf | 1915 | preempt_enable(); |
1da177e4 | 1916 | |
414fd31b | 1917 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1918 | } |
1919 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1920 | ||
eea8b54d AN |
1921 | /* |
1922 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1923 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1924 | * |
1925 | * You must hold the module_mutex. | |
eea8b54d AN |
1926 | */ |
1927 | static int verify_export_symbols(struct module *mod) | |
1928 | { | |
b211104d | 1929 | unsigned int i; |
eea8b54d | 1930 | struct module *owner; |
b211104d RR |
1931 | const struct kernel_symbol *s; |
1932 | struct { | |
1933 | const struct kernel_symbol *sym; | |
1934 | unsigned int num; | |
1935 | } arr[] = { | |
1936 | { mod->syms, mod->num_syms }, | |
1937 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1938 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1939 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1940 | { mod->unused_syms, mod->num_unused_syms }, |
1941 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1942 | #endif |
b211104d | 1943 | }; |
eea8b54d | 1944 | |
b211104d RR |
1945 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1946 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 1947 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d RR |
1948 | printk(KERN_ERR |
1949 | "%s: exports duplicate symbol %s" | |
1950 | " (owned by %s)\n", | |
1951 | mod->name, s->name, module_name(owner)); | |
1952 | return -ENOEXEC; | |
1953 | } | |
eea8b54d | 1954 | } |
b211104d RR |
1955 | } |
1956 | return 0; | |
eea8b54d AN |
1957 | } |
1958 | ||
9a4b9708 | 1959 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
1960 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
1961 | { | |
1962 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
1963 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 1964 | unsigned long secbase; |
49668688 | 1965 | unsigned int i; |
1da177e4 | 1966 | int ret = 0; |
414fd31b | 1967 | const struct kernel_symbol *ksym; |
1da177e4 | 1968 | |
49668688 RR |
1969 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
1970 | const char *name = info->strtab + sym[i].st_name; | |
1971 | ||
1da177e4 LT |
1972 | switch (sym[i].st_shndx) { |
1973 | case SHN_COMMON: | |
1974 | /* We compiled with -fno-common. These are not | |
1975 | supposed to happen. */ | |
5e124169 | 1976 | pr_debug("Common symbol: %s\n", name); |
1da177e4 LT |
1977 | printk("%s: please compile with -fno-common\n", |
1978 | mod->name); | |
1979 | ret = -ENOEXEC; | |
1980 | break; | |
1981 | ||
1982 | case SHN_ABS: | |
1983 | /* Don't need to do anything */ | |
5e124169 | 1984 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
1985 | (long)sym[i].st_value); |
1986 | break; | |
1987 | ||
1988 | case SHN_UNDEF: | |
49668688 | 1989 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 1990 | /* Ok if resolved. */ |
9bea7f23 | 1991 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 1992 | sym[i].st_value = ksym->value; |
1da177e4 | 1993 | break; |
414fd31b TA |
1994 | } |
1995 | ||
1da177e4 | 1996 | /* Ok if weak. */ |
9bea7f23 | 1997 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
1998 | break; |
1999 | ||
9bea7f23 | 2000 | printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n", |
49668688 | 2001 | mod->name, name, PTR_ERR(ksym)); |
9bea7f23 | 2002 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
2003 | break; |
2004 | ||
2005 | default: | |
2006 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2007 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2008 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2009 | else |
49668688 | 2010 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2011 | sym[i].st_value += secbase; |
2012 | break; | |
2013 | } | |
2014 | } | |
2015 | ||
2016 | return ret; | |
2017 | } | |
2018 | ||
49668688 | 2019 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2020 | { |
2021 | unsigned int i; | |
2022 | int err = 0; | |
2023 | ||
2024 | /* Now do relocations. */ | |
49668688 RR |
2025 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2026 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2027 | |
2028 | /* Not a valid relocation section? */ | |
49668688 | 2029 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2030 | continue; |
2031 | ||
2032 | /* Don't bother with non-allocated sections */ | |
49668688 | 2033 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2034 | continue; |
2035 | ||
49668688 RR |
2036 | if (info->sechdrs[i].sh_type == SHT_REL) |
2037 | err = apply_relocate(info->sechdrs, info->strtab, | |
2038 | info->index.sym, i, mod); | |
2039 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2040 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2041 | info->index.sym, i, mod); | |
22e268eb RR |
2042 | if (err < 0) |
2043 | break; | |
2044 | } | |
2045 | return err; | |
2046 | } | |
2047 | ||
088af9a6 HD |
2048 | /* Additional bytes needed by arch in front of individual sections */ |
2049 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2050 | unsigned int section) | |
2051 | { | |
2052 | /* default implementation just returns zero */ | |
2053 | return 0; | |
2054 | } | |
2055 | ||
1da177e4 | 2056 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2057 | static long get_offset(struct module *mod, unsigned int *size, |
2058 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2059 | { |
2060 | long ret; | |
2061 | ||
088af9a6 | 2062 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2063 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2064 | *size = ret + sechdr->sh_size; | |
2065 | return ret; | |
2066 | } | |
2067 | ||
2068 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2069 | might -- code, read-only data, read-write data, small data. Tally | |
2070 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2071 | belongs in init. */ | |
49668688 | 2072 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2073 | { |
2074 | static unsigned long const masks[][2] = { | |
2075 | /* NOTE: all executable code must be the first section | |
2076 | * in this array; otherwise modify the text_size | |
2077 | * finder in the two loops below */ | |
2078 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2079 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
2080 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2081 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2082 | }; | |
2083 | unsigned int m, i; | |
2084 | ||
49668688 RR |
2085 | for (i = 0; i < info->hdr->e_shnum; i++) |
2086 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2087 | |
5e124169 | 2088 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2089 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2090 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2091 | Elf_Shdr *s = &info->sechdrs[i]; | |
2092 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2093 | |
2094 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2095 | || (s->sh_flags & masks[m][1]) | |
2096 | || s->sh_entsize != ~0UL | |
49668688 | 2097 | || strstarts(sname, ".init")) |
1da177e4 | 2098 | continue; |
088af9a6 | 2099 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
5e124169 | 2100 | pr_debug("\t%s\n", sname); |
1da177e4 | 2101 | } |
84e1c6bb MC |
2102 | switch (m) { |
2103 | case 0: /* executable */ | |
2104 | mod->core_size = debug_align(mod->core_size); | |
1da177e4 | 2105 | mod->core_text_size = mod->core_size; |
84e1c6bb MC |
2106 | break; |
2107 | case 1: /* RO: text and ro-data */ | |
2108 | mod->core_size = debug_align(mod->core_size); | |
2109 | mod->core_ro_size = mod->core_size; | |
2110 | break; | |
2111 | case 3: /* whole core */ | |
2112 | mod->core_size = debug_align(mod->core_size); | |
2113 | break; | |
2114 | } | |
1da177e4 LT |
2115 | } |
2116 | ||
5e124169 | 2117 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2118 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2119 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2120 | Elf_Shdr *s = &info->sechdrs[i]; | |
2121 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2122 | |
2123 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2124 | || (s->sh_flags & masks[m][1]) | |
2125 | || s->sh_entsize != ~0UL | |
49668688 | 2126 | || !strstarts(sname, ".init")) |
1da177e4 | 2127 | continue; |
088af9a6 | 2128 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 | 2129 | | INIT_OFFSET_MASK); |
5e124169 | 2130 | pr_debug("\t%s\n", sname); |
1da177e4 | 2131 | } |
84e1c6bb MC |
2132 | switch (m) { |
2133 | case 0: /* executable */ | |
2134 | mod->init_size = debug_align(mod->init_size); | |
1da177e4 | 2135 | mod->init_text_size = mod->init_size; |
84e1c6bb MC |
2136 | break; |
2137 | case 1: /* RO: text and ro-data */ | |
2138 | mod->init_size = debug_align(mod->init_size); | |
2139 | mod->init_ro_size = mod->init_size; | |
2140 | break; | |
2141 | case 3: /* whole init */ | |
2142 | mod->init_size = debug_align(mod->init_size); | |
2143 | break; | |
2144 | } | |
1da177e4 LT |
2145 | } |
2146 | } | |
2147 | ||
1da177e4 LT |
2148 | static void set_license(struct module *mod, const char *license) |
2149 | { | |
2150 | if (!license) | |
2151 | license = "unspecified"; | |
2152 | ||
fa3ba2e8 | 2153 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2154 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 2155 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 | 2156 | "kernel.\n", mod->name, license); |
373d4d09 RR |
2157 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2158 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2159 | } |
2160 | } | |
2161 | ||
2162 | /* Parse tag=value strings from .modinfo section */ | |
2163 | static char *next_string(char *string, unsigned long *secsize) | |
2164 | { | |
2165 | /* Skip non-zero chars */ | |
2166 | while (string[0]) { | |
2167 | string++; | |
2168 | if ((*secsize)-- <= 1) | |
2169 | return NULL; | |
2170 | } | |
2171 | ||
2172 | /* Skip any zero padding. */ | |
2173 | while (!string[0]) { | |
2174 | string++; | |
2175 | if ((*secsize)-- <= 1) | |
2176 | return NULL; | |
2177 | } | |
2178 | return string; | |
2179 | } | |
2180 | ||
49668688 | 2181 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2182 | { |
2183 | char *p; | |
2184 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2185 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2186 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2187 | |
49668688 | 2188 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2189 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2190 | return p + taglen + 1; | |
2191 | } | |
2192 | return NULL; | |
2193 | } | |
2194 | ||
49668688 | 2195 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2196 | { |
2197 | struct module_attribute *attr; | |
2198 | int i; | |
2199 | ||
2200 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2201 | if (attr->setup) | |
49668688 | 2202 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2203 | } |
2204 | } | |
c988d2b2 | 2205 | |
a263f776 RR |
2206 | static void free_modinfo(struct module *mod) |
2207 | { | |
2208 | struct module_attribute *attr; | |
2209 | int i; | |
2210 | ||
2211 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2212 | if (attr->free) | |
2213 | attr->free(mod); | |
2214 | } | |
2215 | } | |
2216 | ||
1da177e4 | 2217 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2218 | |
2219 | /* lookup symbol in given range of kernel_symbols */ | |
2220 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2221 | const struct kernel_symbol *start, | |
2222 | const struct kernel_symbol *stop) | |
2223 | { | |
9d63487f AIB |
2224 | return bsearch(name, start, stop - start, |
2225 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2226 | } |
2227 | ||
ca4787b7 TA |
2228 | static int is_exported(const char *name, unsigned long value, |
2229 | const struct module *mod) | |
1da177e4 | 2230 | { |
ca4787b7 TA |
2231 | const struct kernel_symbol *ks; |
2232 | if (!mod) | |
2233 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2234 | else |
ca4787b7 TA |
2235 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2236 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2237 | } |
2238 | ||
2239 | /* As per nm */ | |
eded41c1 | 2240 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2241 | { |
eded41c1 RR |
2242 | const Elf_Shdr *sechdrs = info->sechdrs; |
2243 | ||
1da177e4 LT |
2244 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2245 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2246 | return 'v'; | |
2247 | else | |
2248 | return 'w'; | |
2249 | } | |
2250 | if (sym->st_shndx == SHN_UNDEF) | |
2251 | return 'U'; | |
2252 | if (sym->st_shndx == SHN_ABS) | |
2253 | return 'a'; | |
2254 | if (sym->st_shndx >= SHN_LORESERVE) | |
2255 | return '?'; | |
2256 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2257 | return 't'; | |
2258 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2259 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2260 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2261 | return 'r'; | |
2262 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2263 | return 'g'; | |
2264 | else | |
2265 | return 'd'; | |
2266 | } | |
2267 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2268 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2269 | return 's'; | |
2270 | else | |
2271 | return 'b'; | |
2272 | } | |
eded41c1 RR |
2273 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2274 | ".debug")) { | |
1da177e4 | 2275 | return 'n'; |
eded41c1 | 2276 | } |
1da177e4 LT |
2277 | return '?'; |
2278 | } | |
2279 | ||
4a496226 JB |
2280 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
2281 | unsigned int shnum) | |
2282 | { | |
2283 | const Elf_Shdr *sec; | |
2284 | ||
2285 | if (src->st_shndx == SHN_UNDEF | |
2286 | || src->st_shndx >= shnum | |
2287 | || !src->st_name) | |
2288 | return false; | |
2289 | ||
2290 | sec = sechdrs + src->st_shndx; | |
2291 | if (!(sec->sh_flags & SHF_ALLOC) | |
2292 | #ifndef CONFIG_KALLSYMS_ALL | |
2293 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2294 | #endif | |
2295 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2296 | return false; | |
2297 | ||
2298 | return true; | |
2299 | } | |
2300 | ||
48fd1188 KC |
2301 | /* |
2302 | * We only allocate and copy the strings needed by the parts of symtab | |
2303 | * we keep. This is simple, but has the effect of making multiple | |
2304 | * copies of duplicates. We could be more sophisticated, see | |
2305 | * linux-kernel thread starting with | |
2306 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2307 | */ | |
49668688 | 2308 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2309 | { |
49668688 RR |
2310 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2311 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2312 | const Elf_Sym *src; |
54523ec7 | 2313 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2314 | |
2315 | /* Put symbol section at end of init part of module. */ | |
2316 | symsect->sh_flags |= SHF_ALLOC; | |
2317 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
49668688 | 2318 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2319 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2320 | |
49668688 | 2321 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2322 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2323 | |
48fd1188 | 2324 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 RR |
2325 | for (ndst = i = 0; i < nsrc; i++) { |
2326 | if (i == 0 || | |
2327 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2328 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; | |
48fd1188 | 2329 | ndst++; |
554bdfe5 | 2330 | } |
59ef28b1 | 2331 | } |
4a496226 JB |
2332 | |
2333 | /* Append room for core symbols at end of core part. */ | |
49668688 | 2334 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
48fd1188 KC |
2335 | info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
2336 | mod->core_size += strtab_size; | |
4a496226 | 2337 | |
554bdfe5 JB |
2338 | /* Put string table section at end of init part of module. */ |
2339 | strsect->sh_flags |= SHF_ALLOC; | |
2340 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
49668688 | 2341 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2342 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
4a496226 JB |
2343 | } |
2344 | ||
811d66a0 | 2345 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2346 | { |
4a496226 JB |
2347 | unsigned int i, ndst; |
2348 | const Elf_Sym *src; | |
2349 | Elf_Sym *dst; | |
554bdfe5 | 2350 | char *s; |
eded41c1 | 2351 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2352 | |
eded41c1 RR |
2353 | mod->symtab = (void *)symsec->sh_addr; |
2354 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae RR |
2355 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2356 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2357 | |
2358 | /* Set types up while we still have access to sections. */ | |
2359 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2360 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2361 | |
d913188c | 2362 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
48fd1188 | 2363 | mod->core_strtab = s = mod->module_core + info->stroffs; |
4a496226 | 2364 | src = mod->symtab; |
59ef28b1 RR |
2365 | for (ndst = i = 0; i < mod->num_symtab; i++) { |
2366 | if (i == 0 || | |
2367 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2368 | dst[ndst] = src[i]; | |
2369 | dst[ndst++].st_name = s - mod->core_strtab; | |
2370 | s += strlcpy(s, &mod->strtab[src[i].st_name], | |
2371 | KSYM_NAME_LEN) + 1; | |
2372 | } | |
4a496226 JB |
2373 | } |
2374 | mod->core_num_syms = ndst; | |
1da177e4 LT |
2375 | } |
2376 | #else | |
49668688 | 2377 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2378 | { |
2379 | } | |
3ae91c21 | 2380 | |
abbce906 | 2381 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2382 | { |
2383 | } | |
2384 | #endif /* CONFIG_KALLSYMS */ | |
2385 | ||
e9d376f0 | 2386 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2387 | { |
811d66a0 RR |
2388 | if (!debug) |
2389 | return; | |
e9d376f0 JB |
2390 | #ifdef CONFIG_DYNAMIC_DEBUG |
2391 | if (ddebug_add_module(debug, num, debug->modname)) | |
2392 | printk(KERN_ERR "dynamic debug error adding module: %s\n", | |
2393 | debug->modname); | |
2394 | #endif | |
5e458cc0 | 2395 | } |
346e15be | 2396 | |
ff49d74a YS |
2397 | static void dynamic_debug_remove(struct _ddebug *debug) |
2398 | { | |
2399 | if (debug) | |
2400 | ddebug_remove_module(debug->modname); | |
2401 | } | |
2402 | ||
74e08fcf JB |
2403 | void * __weak module_alloc(unsigned long size) |
2404 | { | |
82fab442 | 2405 | return vmalloc_exec(size); |
74e08fcf JB |
2406 | } |
2407 | ||
3a642e99 RR |
2408 | static void *module_alloc_update_bounds(unsigned long size) |
2409 | { | |
2410 | void *ret = module_alloc(size); | |
2411 | ||
2412 | if (ret) { | |
75676500 | 2413 | mutex_lock(&module_mutex); |
3a642e99 RR |
2414 | /* Update module bounds. */ |
2415 | if ((unsigned long)ret < module_addr_min) | |
2416 | module_addr_min = (unsigned long)ret; | |
2417 | if ((unsigned long)ret + size > module_addr_max) | |
2418 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2419 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2420 | } |
2421 | return ret; | |
2422 | } | |
2423 | ||
4f2294b6 | 2424 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2425 | static void kmemleak_load_module(const struct module *mod, |
2426 | const struct load_info *info) | |
4f2294b6 CM |
2427 | { |
2428 | unsigned int i; | |
2429 | ||
2430 | /* only scan the sections containing data */ | |
c017b4be | 2431 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2432 | |
49668688 | 2433 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2434 | /* Scan all writable sections that's not executable */ |
2435 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2436 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2437 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2438 | continue; |
2439 | ||
49668688 RR |
2440 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2441 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2442 | } |
2443 | } | |
2444 | #else | |
49668688 RR |
2445 | static inline void kmemleak_load_module(const struct module *mod, |
2446 | const struct load_info *info) | |
4f2294b6 CM |
2447 | { |
2448 | } | |
2449 | #endif | |
2450 | ||
106a4ee2 | 2451 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2452 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2453 | { |
2454 | int err = -ENOKEY; | |
34e1169d KC |
2455 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2456 | const void *mod = info->hdr; | |
caabe240 | 2457 | |
34e1169d KC |
2458 | if (info->len > markerlen && |
2459 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { | |
caabe240 | 2460 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2461 | info->len -= markerlen; |
2462 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2463 | } |
2464 | ||
2465 | if (!err) { | |
2466 | info->sig_ok = true; | |
2467 | return 0; | |
2468 | } | |
2469 | ||
2470 | /* Not having a signature is only an error if we're strict. */ | |
1d0059f3 DH |
2471 | if (err < 0 && fips_enabled) |
2472 | panic("Module verification failed with error %d in FIPS mode\n", | |
2473 | err); | |
106a4ee2 RR |
2474 | if (err == -ENOKEY && !sig_enforce) |
2475 | err = 0; | |
2476 | ||
2477 | return err; | |
2478 | } | |
2479 | #else /* !CONFIG_MODULE_SIG */ | |
34e1169d | 2480 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2481 | { |
2482 | return 0; | |
2483 | } | |
2484 | #endif /* !CONFIG_MODULE_SIG */ | |
2485 | ||
34e1169d KC |
2486 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2487 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2488 | { |
34e1169d KC |
2489 | if (info->len < sizeof(*(info->hdr))) |
2490 | return -ENOEXEC; | |
2491 | ||
2492 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2493 | || info->hdr->e_type != ET_REL | |
2494 | || !elf_check_arch(info->hdr) | |
2495 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2496 | return -ENOEXEC; | |
2497 | ||
2498 | if (info->hdr->e_shoff >= info->len | |
2499 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2500 | info->len - info->hdr->e_shoff)) | |
2501 | return -ENOEXEC; | |
40dd2560 | 2502 | |
34e1169d KC |
2503 | return 0; |
2504 | } | |
2505 | ||
2506 | /* Sets info->hdr and info->len. */ | |
2507 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2508 | struct load_info *info) | |
40dd2560 RR |
2509 | { |
2510 | int err; | |
40dd2560 | 2511 | |
34e1169d KC |
2512 | info->len = len; |
2513 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2514 | return -ENOEXEC; |
2515 | ||
2e72d51b KC |
2516 | err = security_kernel_module_from_file(NULL); |
2517 | if (err) | |
2518 | return err; | |
2519 | ||
40dd2560 | 2520 | /* Suck in entire file: we'll want most of it. */ |
34e1169d KC |
2521 | info->hdr = vmalloc(info->len); |
2522 | if (!info->hdr) | |
40dd2560 RR |
2523 | return -ENOMEM; |
2524 | ||
34e1169d KC |
2525 | if (copy_from_user(info->hdr, umod, info->len) != 0) { |
2526 | vfree(info->hdr); | |
2527 | return -EFAULT; | |
40dd2560 RR |
2528 | } |
2529 | ||
34e1169d KC |
2530 | return 0; |
2531 | } | |
2532 | ||
2533 | /* Sets info->hdr and info->len. */ | |
2534 | static int copy_module_from_fd(int fd, struct load_info *info) | |
2535 | { | |
2536 | struct file *file; | |
2537 | int err; | |
2538 | struct kstat stat; | |
2539 | loff_t pos; | |
2540 | ssize_t bytes = 0; | |
2541 | ||
2542 | file = fget(fd); | |
2543 | if (!file) | |
2544 | return -ENOEXEC; | |
2545 | ||
2e72d51b | 2546 | err = security_kernel_module_from_file(file); |
106a4ee2 | 2547 | if (err) |
2e72d51b | 2548 | goto out; |
106a4ee2 | 2549 | |
3dadecce | 2550 | err = vfs_getattr(&file->f_path, &stat); |
106a4ee2 | 2551 | if (err) |
34e1169d | 2552 | goto out; |
40dd2560 | 2553 | |
34e1169d KC |
2554 | if (stat.size > INT_MAX) { |
2555 | err = -EFBIG; | |
2556 | goto out; | |
40dd2560 | 2557 | } |
52441fa8 SL |
2558 | |
2559 | /* Don't hand 0 to vmalloc, it whines. */ | |
2560 | if (stat.size == 0) { | |
2561 | err = -EINVAL; | |
2562 | goto out; | |
2563 | } | |
2564 | ||
34e1169d KC |
2565 | info->hdr = vmalloc(stat.size); |
2566 | if (!info->hdr) { | |
2567 | err = -ENOMEM; | |
2568 | goto out; | |
40dd2560 | 2569 | } |
d913188c | 2570 | |
34e1169d KC |
2571 | pos = 0; |
2572 | while (pos < stat.size) { | |
2573 | bytes = kernel_read(file, pos, (char *)(info->hdr) + pos, | |
2574 | stat.size - pos); | |
2575 | if (bytes < 0) { | |
2576 | vfree(info->hdr); | |
2577 | err = bytes; | |
2578 | goto out; | |
2579 | } | |
2580 | if (bytes == 0) | |
2581 | break; | |
2582 | pos += bytes; | |
2583 | } | |
2584 | info->len = pos; | |
40dd2560 | 2585 | |
34e1169d KC |
2586 | out: |
2587 | fput(file); | |
40dd2560 RR |
2588 | return err; |
2589 | } | |
2590 | ||
d913188c RR |
2591 | static void free_copy(struct load_info *info) |
2592 | { | |
d913188c RR |
2593 | vfree(info->hdr); |
2594 | } | |
2595 | ||
2f3238ae | 2596 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2597 | { |
2598 | unsigned int i; | |
2599 | ||
2600 | /* This should always be true, but let's be sure. */ | |
2601 | info->sechdrs[0].sh_addr = 0; | |
2602 | ||
2603 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2604 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2605 | if (shdr->sh_type != SHT_NOBITS | |
2606 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
2607 | printk(KERN_ERR "Module len %lu truncated\n", | |
2608 | info->len); | |
2609 | return -ENOEXEC; | |
2610 | } | |
2611 | ||
2612 | /* Mark all sections sh_addr with their address in the | |
2613 | temporary image. */ | |
2614 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2615 | ||
2616 | #ifndef CONFIG_MODULE_UNLOAD | |
2617 | /* Don't load .exit sections */ | |
2618 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2619 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2620 | #endif | |
8b5f61a7 | 2621 | } |
d6df72a0 RR |
2622 | |
2623 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2624 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2625 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2626 | else | |
2627 | info->index.vers = find_sec(info, "__versions"); | |
49668688 | 2628 | info->index.info = find_sec(info, ".modinfo"); |
d6df72a0 RR |
2629 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2630 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2631 | return 0; |
2632 | } | |
2633 | ||
3264d3f9 LT |
2634 | /* |
2635 | * Set up our basic convenience variables (pointers to section headers, | |
2636 | * search for module section index etc), and do some basic section | |
2637 | * verification. | |
2638 | * | |
2639 | * Return the temporary module pointer (we'll replace it with the final | |
2640 | * one when we move the module sections around). | |
2641 | */ | |
2f3238ae | 2642 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2643 | { |
2644 | unsigned int i; | |
8b5f61a7 | 2645 | int err; |
3264d3f9 LT |
2646 | struct module *mod; |
2647 | ||
2648 | /* Set up the convenience variables */ | |
2649 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2650 | info->secstrings = (void *)info->hdr |
2651 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2652 | |
2f3238ae | 2653 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2654 | if (err) |
2655 | return ERR_PTR(err); | |
3264d3f9 | 2656 | |
8b5f61a7 RR |
2657 | /* Find internal symbols and strings. */ |
2658 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2659 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2660 | info->index.sym = i; | |
2661 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2662 | info->strtab = (char *)info->hdr |
2663 | + info->sechdrs[info->index.str].sh_offset; | |
2664 | break; | |
3264d3f9 | 2665 | } |
3264d3f9 LT |
2666 | } |
2667 | ||
49668688 | 2668 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 LT |
2669 | if (!info->index.mod) { |
2670 | printk(KERN_WARNING "No module found in object\n"); | |
2671 | return ERR_PTR(-ENOEXEC); | |
2672 | } | |
2673 | /* This is temporary: point mod into copy of data. */ | |
2674 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2675 | ||
2676 | if (info->index.sym == 0) { | |
2677 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
2678 | mod->name); | |
2679 | return ERR_PTR(-ENOEXEC); | |
2680 | } | |
2681 | ||
49668688 | 2682 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2683 | |
3264d3f9 LT |
2684 | /* Check module struct version now, before we try to use module. */ |
2685 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2686 | return ERR_PTR(-ENOEXEC); | |
2687 | ||
2688 | return mod; | |
3264d3f9 LT |
2689 | } |
2690 | ||
2f3238ae | 2691 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2692 | { |
49668688 | 2693 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2694 | int err; |
2695 | ||
2f3238ae RR |
2696 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2697 | modmagic = NULL; | |
2698 | ||
40dd2560 RR |
2699 | /* This is allowed: modprobe --force will invalidate it. */ |
2700 | if (!modmagic) { | |
2701 | err = try_to_force_load(mod, "bad vermagic"); | |
2702 | if (err) | |
2703 | return err; | |
49668688 | 2704 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
40dd2560 RR |
2705 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
2706 | mod->name, modmagic, vermagic); | |
2707 | return -ENOEXEC; | |
2708 | } | |
2709 | ||
2449b8ba | 2710 | if (!get_modinfo(info, "intree")) |
373d4d09 | 2711 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
2449b8ba | 2712 | |
49668688 | 2713 | if (get_modinfo(info, "staging")) { |
373d4d09 | 2714 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
40dd2560 RR |
2715 | printk(KERN_WARNING "%s: module is from the staging directory," |
2716 | " the quality is unknown, you have been warned.\n", | |
2717 | mod->name); | |
2718 | } | |
22e268eb RR |
2719 | |
2720 | /* Set up license info based on the info section */ | |
49668688 | 2721 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2722 | |
40dd2560 RR |
2723 | return 0; |
2724 | } | |
2725 | ||
811d66a0 | 2726 | static void find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2727 | { |
49668688 | 2728 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2729 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2730 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2731 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2732 | mod->crcs = section_addr(info, "__kcrctab"); |
2733 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2734 | sizeof(*mod->gpl_syms), |
2735 | &mod->num_gpl_syms); | |
49668688 RR |
2736 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2737 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2738 | "__ksymtab_gpl_future", |
2739 | sizeof(*mod->gpl_future_syms), | |
2740 | &mod->num_gpl_future_syms); | |
49668688 | 2741 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2742 | |
2743 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2744 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2745 | sizeof(*mod->unused_syms), |
2746 | &mod->num_unused_syms); | |
49668688 RR |
2747 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2748 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2749 | sizeof(*mod->unused_gpl_syms), |
2750 | &mod->num_unused_gpl_syms); | |
49668688 | 2751 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2752 | #endif |
2753 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2754 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb LT |
2755 | sizeof(*mod->ctors), &mod->num_ctors); |
2756 | #endif | |
2757 | ||
2758 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2759 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2760 | sizeof(*mod->tracepoints_ptrs), | |
2761 | &mod->num_tracepoints); | |
f91a13bb | 2762 | #endif |
bf5438fc JB |
2763 | #ifdef HAVE_JUMP_LABEL |
2764 | mod->jump_entries = section_objs(info, "__jump_table", | |
2765 | sizeof(*mod->jump_entries), | |
2766 | &mod->num_jump_entries); | |
2767 | #endif | |
f91a13bb | 2768 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2769 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2770 | sizeof(*mod->trace_events), |
2771 | &mod->num_trace_events); | |
f91a13bb | 2772 | #endif |
13b9b6e7 SR |
2773 | #ifdef CONFIG_TRACING |
2774 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2775 | sizeof(*mod->trace_bprintk_fmt_start), | |
2776 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 2777 | #endif |
f91a13bb LT |
2778 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2779 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2780 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2781 | sizeof(*mod->ftrace_callsites), |
2782 | &mod->num_ftrace_callsites); | |
2783 | #endif | |
22e268eb | 2784 | |
811d66a0 RR |
2785 | mod->extable = section_objs(info, "__ex_table", |
2786 | sizeof(*mod->extable), &mod->num_exentries); | |
2787 | ||
49668688 | 2788 | if (section_addr(info, "__obsparm")) |
22e268eb RR |
2789 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2790 | mod->name); | |
811d66a0 RR |
2791 | |
2792 | info->debug = section_objs(info, "__verbose", | |
2793 | sizeof(*info->debug), &info->num_debug); | |
f91a13bb LT |
2794 | } |
2795 | ||
49668688 | 2796 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2797 | { |
2798 | int i; | |
2799 | void *ptr; | |
2800 | ||
2801 | /* Do the allocs. */ | |
2802 | ptr = module_alloc_update_bounds(mod->core_size); | |
2803 | /* | |
2804 | * The pointer to this block is stored in the module structure | |
2805 | * which is inside the block. Just mark it as not being a | |
2806 | * leak. | |
2807 | */ | |
2808 | kmemleak_not_leak(ptr); | |
2809 | if (!ptr) | |
d913188c | 2810 | return -ENOMEM; |
65b8a9b4 LT |
2811 | |
2812 | memset(ptr, 0, mod->core_size); | |
2813 | mod->module_core = ptr; | |
2814 | ||
82fab442 RR |
2815 | if (mod->init_size) { |
2816 | ptr = module_alloc_update_bounds(mod->init_size); | |
2817 | /* | |
2818 | * The pointer to this block is stored in the module structure | |
2819 | * which is inside the block. This block doesn't need to be | |
2820 | * scanned as it contains data and code that will be freed | |
2821 | * after the module is initialized. | |
2822 | */ | |
2823 | kmemleak_ignore(ptr); | |
2824 | if (!ptr) { | |
2825 | module_free(mod, mod->module_core); | |
2826 | return -ENOMEM; | |
2827 | } | |
2828 | memset(ptr, 0, mod->init_size); | |
2829 | mod->module_init = ptr; | |
2830 | } else | |
2831 | mod->module_init = NULL; | |
65b8a9b4 LT |
2832 | |
2833 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 2834 | pr_debug("final section addresses:\n"); |
49668688 | 2835 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2836 | void *dest; |
49668688 | 2837 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2838 | |
49668688 | 2839 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2840 | continue; |
2841 | ||
49668688 | 2842 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
65b8a9b4 | 2843 | dest = mod->module_init |
49668688 | 2844 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 2845 | else |
49668688 | 2846 | dest = mod->module_core + shdr->sh_entsize; |
65b8a9b4 | 2847 | |
49668688 RR |
2848 | if (shdr->sh_type != SHT_NOBITS) |
2849 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 2850 | /* Update sh_addr to point to copy in image. */ |
49668688 | 2851 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
2852 | pr_debug("\t0x%lx %s\n", |
2853 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 2854 | } |
d913188c RR |
2855 | |
2856 | return 0; | |
65b8a9b4 LT |
2857 | } |
2858 | ||
49668688 | 2859 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
2860 | { |
2861 | /* | |
2862 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2863 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2864 | * using GPL-only symbols it needs. | |
2865 | */ | |
2866 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 2867 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
2868 | |
2869 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2870 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
2871 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2872 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 2873 | |
c99af375 MG |
2874 | /* lve claims to be GPL but upstream won't provide source */ |
2875 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
2876 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2877 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 2878 | |
22e268eb RR |
2879 | #ifdef CONFIG_MODVERSIONS |
2880 | if ((mod->num_syms && !mod->crcs) | |
2881 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2882 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
2883 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2884 | || (mod->num_unused_syms && !mod->unused_crcs) | |
2885 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
2886 | #endif | |
2887 | ) { | |
2888 | return try_to_force_load(mod, | |
2889 | "no versions for exported symbols"); | |
2890 | } | |
2891 | #endif | |
2892 | return 0; | |
2893 | } | |
2894 | ||
2895 | static void flush_module_icache(const struct module *mod) | |
2896 | { | |
2897 | mm_segment_t old_fs; | |
2898 | ||
2899 | /* flush the icache in correct context */ | |
2900 | old_fs = get_fs(); | |
2901 | set_fs(KERNEL_DS); | |
2902 | ||
2903 | /* | |
2904 | * Flush the instruction cache, since we've played with text. | |
2905 | * Do it before processing of module parameters, so the module | |
2906 | * can provide parameter accessor functions of its own. | |
2907 | */ | |
2908 | if (mod->module_init) | |
2909 | flush_icache_range((unsigned long)mod->module_init, | |
2910 | (unsigned long)mod->module_init | |
2911 | + mod->init_size); | |
2912 | flush_icache_range((unsigned long)mod->module_core, | |
2913 | (unsigned long)mod->module_core + mod->core_size); | |
2914 | ||
2915 | set_fs(old_fs); | |
2916 | } | |
2917 | ||
74e08fcf JB |
2918 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
2919 | Elf_Shdr *sechdrs, | |
2920 | char *secstrings, | |
2921 | struct module *mod) | |
2922 | { | |
2923 | return 0; | |
2924 | } | |
2925 | ||
2f3238ae | 2926 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 2927 | { |
d913188c | 2928 | /* Module within temporary copy. */ |
1da177e4 | 2929 | struct module *mod; |
49668688 | 2930 | Elf_Shdr *pcpusec; |
d913188c | 2931 | int err; |
3ae91c21 | 2932 | |
2f3238ae | 2933 | mod = setup_load_info(info, flags); |
d913188c RR |
2934 | if (IS_ERR(mod)) |
2935 | return mod; | |
1da177e4 | 2936 | |
2f3238ae | 2937 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
2938 | if (err) |
2939 | return ERR_PTR(err); | |
1da177e4 | 2940 | |
1da177e4 | 2941 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
2942 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
2943 | info->secstrings, mod); | |
1da177e4 | 2944 | if (err < 0) |
6526c534 | 2945 | goto out; |
1da177e4 | 2946 | |
49668688 RR |
2947 | pcpusec = &info->sechdrs[info->index.pcpu]; |
2948 | if (pcpusec->sh_size) { | |
1da177e4 | 2949 | /* We have a special allocation for this section. */ |
49668688 RR |
2950 | err = percpu_modalloc(mod, |
2951 | pcpusec->sh_size, pcpusec->sh_addralign); | |
259354de | 2952 | if (err) |
6526c534 | 2953 | goto out; |
49668688 | 2954 | pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
2955 | } |
2956 | ||
2957 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2958 | this is done generically; there doesn't appear to be any | |
2959 | special cases for the architectures. */ | |
49668688 | 2960 | layout_sections(mod, info); |
49668688 | 2961 | layout_symtab(mod, info); |
1da177e4 | 2962 | |
65b8a9b4 | 2963 | /* Allocate and move to the final place */ |
49668688 | 2964 | err = move_module(mod, info); |
d913188c | 2965 | if (err) |
48fd1188 | 2966 | goto free_percpu; |
d913188c RR |
2967 | |
2968 | /* Module has been copied to its final place now: return it. */ | |
2969 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 2970 | kmemleak_load_module(mod, info); |
d913188c RR |
2971 | return mod; |
2972 | ||
d913188c RR |
2973 | free_percpu: |
2974 | percpu_modfree(mod); | |
6526c534 | 2975 | out: |
d913188c RR |
2976 | return ERR_PTR(err); |
2977 | } | |
2978 | ||
2979 | /* mod is no longer valid after this! */ | |
2980 | static void module_deallocate(struct module *mod, struct load_info *info) | |
2981 | { | |
d913188c RR |
2982 | percpu_modfree(mod); |
2983 | module_free(mod, mod->module_init); | |
2984 | module_free(mod, mod->module_core); | |
2985 | } | |
2986 | ||
74e08fcf JB |
2987 | int __weak module_finalize(const Elf_Ehdr *hdr, |
2988 | const Elf_Shdr *sechdrs, | |
2989 | struct module *me) | |
2990 | { | |
2991 | return 0; | |
2992 | } | |
2993 | ||
811d66a0 RR |
2994 | static int post_relocation(struct module *mod, const struct load_info *info) |
2995 | { | |
51f3d0f4 | 2996 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
2997 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
2998 | ||
2999 | /* Copy relocated percpu area over. */ | |
3000 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3001 | info->sechdrs[info->index.pcpu].sh_size); | |
3002 | ||
51f3d0f4 | 3003 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3004 | add_kallsyms(mod, info); |
3005 | ||
3006 | /* Arch-specific module finalizing. */ | |
3007 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3008 | } | |
3009 | ||
9bb9c3be RR |
3010 | /* Is this module of this name done loading? No locks held. */ |
3011 | static bool finished_loading(const char *name) | |
3012 | { | |
3013 | struct module *mod; | |
3014 | bool ret; | |
3015 | ||
3016 | mutex_lock(&module_mutex); | |
1fb9341a | 3017 | mod = find_module_all(name, true); |
0d21b0e3 RR |
3018 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3019 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3020 | mutex_unlock(&module_mutex); |
3021 | ||
3022 | return ret; | |
3023 | } | |
3024 | ||
34e1169d KC |
3025 | /* Call module constructors. */ |
3026 | static void do_mod_ctors(struct module *mod) | |
3027 | { | |
3028 | #ifdef CONFIG_CONSTRUCTORS | |
3029 | unsigned long i; | |
3030 | ||
3031 | for (i = 0; i < mod->num_ctors; i++) | |
3032 | mod->ctors[i](); | |
3033 | #endif | |
3034 | } | |
3035 | ||
3036 | /* This is where the real work happens */ | |
3037 | static int do_init_module(struct module *mod) | |
3038 | { | |
3039 | int ret = 0; | |
3040 | ||
774a1221 TH |
3041 | /* |
3042 | * We want to find out whether @mod uses async during init. Clear | |
3043 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3044 | */ | |
3045 | current->flags &= ~PF_USED_ASYNC; | |
3046 | ||
34e1169d KC |
3047 | blocking_notifier_call_chain(&module_notify_list, |
3048 | MODULE_STATE_COMING, mod); | |
3049 | ||
3050 | /* Set RO and NX regions for core */ | |
3051 | set_section_ro_nx(mod->module_core, | |
3052 | mod->core_text_size, | |
3053 | mod->core_ro_size, | |
3054 | mod->core_size); | |
3055 | ||
3056 | /* Set RO and NX regions for init */ | |
3057 | set_section_ro_nx(mod->module_init, | |
3058 | mod->init_text_size, | |
3059 | mod->init_ro_size, | |
3060 | mod->init_size); | |
3061 | ||
3062 | do_mod_ctors(mod); | |
3063 | /* Start the module */ | |
3064 | if (mod->init != NULL) | |
3065 | ret = do_one_initcall(mod->init); | |
3066 | if (ret < 0) { | |
3067 | /* Init routine failed: abort. Try to protect us from | |
3068 | buggy refcounters. */ | |
3069 | mod->state = MODULE_STATE_GOING; | |
3070 | synchronize_sched(); | |
3071 | module_put(mod); | |
3072 | blocking_notifier_call_chain(&module_notify_list, | |
3073 | MODULE_STATE_GOING, mod); | |
3074 | free_module(mod); | |
3075 | wake_up_all(&module_wq); | |
3076 | return ret; | |
3077 | } | |
3078 | if (ret > 0) { | |
3079 | printk(KERN_WARNING | |
3080 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" | |
3081 | "%s: loading module anyway...\n", | |
3082 | __func__, mod->name, ret, | |
3083 | __func__); | |
3084 | dump_stack(); | |
3085 | } | |
3086 | ||
3087 | /* Now it's a first class citizen! */ | |
3088 | mod->state = MODULE_STATE_LIVE; | |
3089 | blocking_notifier_call_chain(&module_notify_list, | |
3090 | MODULE_STATE_LIVE, mod); | |
3091 | ||
774a1221 TH |
3092 | /* |
3093 | * We need to finish all async code before the module init sequence | |
3094 | * is done. This has potential to deadlock. For example, a newly | |
3095 | * detected block device can trigger request_module() of the | |
3096 | * default iosched from async probing task. Once userland helper | |
3097 | * reaches here, async_synchronize_full() will wait on the async | |
3098 | * task waiting on request_module() and deadlock. | |
3099 | * | |
3100 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3101 | * iff module init queued any async jobs. This isn't a full | |
3102 | * solution as it will deadlock the same if module loading from | |
3103 | * async jobs nests more than once; however, due to the various | |
3104 | * constraints, this hack seems to be the best option for now. | |
3105 | * Please refer to the following thread for details. | |
3106 | * | |
3107 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3108 | */ | |
3109 | if (current->flags & PF_USED_ASYNC) | |
3110 | async_synchronize_full(); | |
34e1169d KC |
3111 | |
3112 | mutex_lock(&module_mutex); | |
3113 | /* Drop initial reference. */ | |
3114 | module_put(mod); | |
3115 | trim_init_extable(mod); | |
3116 | #ifdef CONFIG_KALLSYMS | |
3117 | mod->num_symtab = mod->core_num_syms; | |
3118 | mod->symtab = mod->core_symtab; | |
3119 | mod->strtab = mod->core_strtab; | |
3120 | #endif | |
3121 | unset_module_init_ro_nx(mod); | |
3122 | module_free(mod, mod->module_init); | |
3123 | mod->module_init = NULL; | |
3124 | mod->init_size = 0; | |
3125 | mod->init_ro_size = 0; | |
3126 | mod->init_text_size = 0; | |
3127 | mutex_unlock(&module_mutex); | |
3128 | wake_up_all(&module_wq); | |
3129 | ||
3130 | return 0; | |
3131 | } | |
3132 | ||
3133 | static int may_init_module(void) | |
3134 | { | |
3135 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3136 | return -EPERM; | |
3137 | ||
3138 | return 0; | |
3139 | } | |
3140 | ||
a3535c7e RR |
3141 | /* |
3142 | * We try to place it in the list now to make sure it's unique before | |
3143 | * we dedicate too many resources. In particular, temporary percpu | |
3144 | * memory exhaustion. | |
3145 | */ | |
3146 | static int add_unformed_module(struct module *mod) | |
3147 | { | |
3148 | int err; | |
3149 | struct module *old; | |
3150 | ||
3151 | mod->state = MODULE_STATE_UNFORMED; | |
3152 | ||
3153 | again: | |
3154 | mutex_lock(&module_mutex); | |
3155 | if ((old = find_module_all(mod->name, true)) != NULL) { | |
3156 | if (old->state == MODULE_STATE_COMING | |
3157 | || old->state == MODULE_STATE_UNFORMED) { | |
3158 | /* Wait in case it fails to load. */ | |
3159 | mutex_unlock(&module_mutex); | |
3160 | err = wait_event_interruptible(module_wq, | |
3161 | finished_loading(mod->name)); | |
3162 | if (err) | |
3163 | goto out_unlocked; | |
3164 | goto again; | |
3165 | } | |
3166 | err = -EEXIST; | |
3167 | goto out; | |
3168 | } | |
3169 | list_add_rcu(&mod->list, &modules); | |
3170 | err = 0; | |
3171 | ||
3172 | out: | |
3173 | mutex_unlock(&module_mutex); | |
3174 | out_unlocked: | |
3175 | return err; | |
3176 | } | |
3177 | ||
3178 | static int complete_formation(struct module *mod, struct load_info *info) | |
3179 | { | |
3180 | int err; | |
3181 | ||
3182 | mutex_lock(&module_mutex); | |
3183 | ||
3184 | /* Find duplicate symbols (must be called under lock). */ | |
3185 | err = verify_export_symbols(mod); | |
3186 | if (err < 0) | |
3187 | goto out; | |
3188 | ||
3189 | /* This relies on module_mutex for list integrity. */ | |
3190 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3191 | ||
3192 | /* Mark state as coming so strong_try_module_get() ignores us, | |
3193 | * but kallsyms etc. can see us. */ | |
3194 | mod->state = MODULE_STATE_COMING; | |
3195 | ||
3196 | out: | |
3197 | mutex_unlock(&module_mutex); | |
3198 | return err; | |
3199 | } | |
3200 | ||
d913188c RR |
3201 | /* Allocate and load the module: note that size of section 0 is always |
3202 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3203 | static int load_module(struct load_info *info, const char __user *uargs, |
3204 | int flags) | |
d913188c | 3205 | { |
a3535c7e | 3206 | struct module *mod; |
d913188c | 3207 | long err; |
d913188c | 3208 | |
34e1169d KC |
3209 | err = module_sig_check(info); |
3210 | if (err) | |
3211 | goto free_copy; | |
d913188c | 3212 | |
34e1169d | 3213 | err = elf_header_check(info); |
d913188c | 3214 | if (err) |
34e1169d | 3215 | goto free_copy; |
d913188c RR |
3216 | |
3217 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3218 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3219 | if (IS_ERR(mod)) { |
3220 | err = PTR_ERR(mod); | |
d913188c | 3221 | goto free_copy; |
1da177e4 | 3222 | } |
1da177e4 | 3223 | |
a3535c7e RR |
3224 | /* Reserve our place in the list. */ |
3225 | err = add_unformed_module(mod); | |
3226 | if (err) | |
1fb9341a | 3227 | goto free_module; |
1fb9341a | 3228 | |
106a4ee2 | 3229 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3230 | mod->sig_ok = info->sig_ok; |
64748a2c RR |
3231 | if (!mod->sig_ok) { |
3232 | printk_once(KERN_NOTICE | |
3233 | "%s: module verification failed: signature and/or" | |
3234 | " required key missing - tainting kernel\n", | |
3235 | mod->name); | |
373d4d09 | 3236 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3237 | } |
106a4ee2 RR |
3238 | #endif |
3239 | ||
49668688 | 3240 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3241 | err = module_unload_init(mod); |
3242 | if (err) | |
1fb9341a | 3243 | goto unlink_mod; |
1da177e4 | 3244 | |
22e268eb RR |
3245 | /* Now we've got everything in the final locations, we can |
3246 | * find optional sections. */ | |
34e1169d | 3247 | find_module_sections(mod, info); |
9b37ccfc | 3248 | |
49668688 | 3249 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3250 | if (err) |
3251 | goto free_unload; | |
9841d61d | 3252 | |
c988d2b2 | 3253 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3254 | setup_modinfo(mod, info); |
c988d2b2 | 3255 | |
1da177e4 | 3256 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3257 | err = simplify_symbols(mod, info); |
1da177e4 | 3258 | if (err < 0) |
d913188c | 3259 | goto free_modinfo; |
1da177e4 | 3260 | |
34e1169d | 3261 | err = apply_relocations(mod, info); |
22e268eb | 3262 | if (err < 0) |
d913188c | 3263 | goto free_modinfo; |
1da177e4 | 3264 | |
34e1169d | 3265 | err = post_relocation(mod, info); |
1da177e4 | 3266 | if (err < 0) |
d913188c | 3267 | goto free_modinfo; |
1da177e4 | 3268 | |
22e268eb | 3269 | flush_module_icache(mod); |
378bac82 | 3270 | |
6526c534 RR |
3271 | /* Now copy in args */ |
3272 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3273 | if (IS_ERR(mod->args)) { | |
3274 | err = PTR_ERR(mod->args); | |
3275 | goto free_arch_cleanup; | |
3276 | } | |
8d3b33f6 | 3277 | |
34e1169d | 3278 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3279 | |
a3535c7e RR |
3280 | /* Finally it's fully formed, ready to start executing. */ |
3281 | err = complete_formation(mod, info); | |
3282 | if (err) | |
1fb9341a | 3283 | goto ddebug_cleanup; |
be593f4c | 3284 | |
51f3d0f4 | 3285 | /* Module is ready to execute: parsing args may do that. */ |
026cee00 | 3286 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
b48420c1 | 3287 | -32768, 32767, &ddebug_dyndbg_module_param_cb); |
1da177e4 | 3288 | if (err < 0) |
1fb9341a | 3289 | goto bug_cleanup; |
1da177e4 | 3290 | |
51f3d0f4 | 3291 | /* Link in to syfs. */ |
34e1169d | 3292 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3293 | if (err < 0) |
1fb9341a | 3294 | goto bug_cleanup; |
80a3d1bb | 3295 | |
48fd1188 | 3296 | /* Get rid of temporary copy. */ |
34e1169d | 3297 | free_copy(info); |
1da177e4 LT |
3298 | |
3299 | /* Done! */ | |
51f3d0f4 | 3300 | trace_module_load(mod); |
34e1169d KC |
3301 | |
3302 | return do_init_module(mod); | |
1da177e4 | 3303 | |
1fb9341a RR |
3304 | bug_cleanup: |
3305 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3306 | mutex_lock(&module_mutex); |
5336377d | 3307 | module_bug_cleanup(mod); |
ee61abb3 | 3308 | mutex_unlock(&module_mutex); |
a3535c7e | 3309 | ddebug_cleanup: |
1fb9341a | 3310 | dynamic_debug_remove(info->debug); |
e91defa2 | 3311 | synchronize_sched(); |
6526c534 RR |
3312 | kfree(mod->args); |
3313 | free_arch_cleanup: | |
1da177e4 | 3314 | module_arch_cleanup(mod); |
d913188c | 3315 | free_modinfo: |
a263f776 | 3316 | free_modinfo(mod); |
22e268eb | 3317 | free_unload: |
1da177e4 | 3318 | module_unload_free(mod); |
1fb9341a RR |
3319 | unlink_mod: |
3320 | mutex_lock(&module_mutex); | |
3321 | /* Unlink carefully: kallsyms could be walking list. */ | |
3322 | list_del_rcu(&mod->list); | |
3323 | wake_up_all(&module_wq); | |
3324 | mutex_unlock(&module_mutex); | |
d913188c | 3325 | free_module: |
34e1169d | 3326 | module_deallocate(mod, info); |
d913188c | 3327 | free_copy: |
34e1169d KC |
3328 | free_copy(info); |
3329 | return err; | |
b99b87f7 PO |
3330 | } |
3331 | ||
17da2bd9 HC |
3332 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3333 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3334 | { |
34e1169d KC |
3335 | int err; |
3336 | struct load_info info = { }; | |
1da177e4 | 3337 | |
34e1169d KC |
3338 | err = may_init_module(); |
3339 | if (err) | |
3340 | return err; | |
1da177e4 | 3341 | |
34e1169d KC |
3342 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3343 | umod, len, uargs); | |
1da177e4 | 3344 | |
34e1169d KC |
3345 | err = copy_module_from_user(umod, len, &info); |
3346 | if (err) | |
3347 | return err; | |
1da177e4 | 3348 | |
2f3238ae | 3349 | return load_module(&info, uargs, 0); |
34e1169d | 3350 | } |
94462ad3 | 3351 | |
2f3238ae | 3352 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d KC |
3353 | { |
3354 | int err; | |
3355 | struct load_info info = { }; | |
94462ad3 | 3356 | |
34e1169d KC |
3357 | err = may_init_module(); |
3358 | if (err) | |
3359 | return err; | |
1da177e4 | 3360 | |
2f3238ae | 3361 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3362 | |
2f3238ae RR |
3363 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3364 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3365 | return -EINVAL; | |
d6de2c80 | 3366 | |
34e1169d KC |
3367 | err = copy_module_from_fd(fd, &info); |
3368 | if (err) | |
3369 | return err; | |
1da177e4 | 3370 | |
2f3238ae | 3371 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3372 | } |
3373 | ||
3374 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3375 | { | |
3376 | return ((void *)addr >= start && (void *)addr < start + size); | |
3377 | } | |
3378 | ||
3379 | #ifdef CONFIG_KALLSYMS | |
3380 | /* | |
3381 | * This ignores the intensely annoying "mapping symbols" found | |
3382 | * in ARM ELF files: $a, $t and $d. | |
3383 | */ | |
3384 | static inline int is_arm_mapping_symbol(const char *str) | |
3385 | { | |
22a8bdeb | 3386 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
3387 | && (str[2] == '\0' || str[2] == '.'); |
3388 | } | |
3389 | ||
3390 | static const char *get_ksymbol(struct module *mod, | |
3391 | unsigned long addr, | |
3392 | unsigned long *size, | |
3393 | unsigned long *offset) | |
3394 | { | |
3395 | unsigned int i, best = 0; | |
3396 | unsigned long nextval; | |
3397 | ||
3398 | /* At worse, next value is at end of module */ | |
a06f6211 | 3399 | if (within_module_init(addr, mod)) |
1da177e4 | 3400 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 3401 | else |
1da177e4 LT |
3402 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
3403 | ||
25985edc | 3404 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3405 | starts real symbols at 1). */ |
1da177e4 LT |
3406 | for (i = 1; i < mod->num_symtab; i++) { |
3407 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
3408 | continue; | |
3409 | ||
3410 | /* We ignore unnamed symbols: they're uninformative | |
3411 | * and inserted at a whim. */ | |
3412 | if (mod->symtab[i].st_value <= addr | |
3413 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
3414 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3415 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3416 | best = i; | |
3417 | if (mod->symtab[i].st_value > addr | |
3418 | && mod->symtab[i].st_value < nextval | |
3419 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3420 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3421 | nextval = mod->symtab[i].st_value; | |
3422 | } | |
3423 | ||
3424 | if (!best) | |
3425 | return NULL; | |
3426 | ||
ffb45122 AD |
3427 | if (size) |
3428 | *size = nextval - mod->symtab[best].st_value; | |
3429 | if (offset) | |
3430 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
3431 | return mod->strtab + mod->symtab[best].st_name; |
3432 | } | |
3433 | ||
6dd06c9f RR |
3434 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3435 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3436 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3437 | unsigned long *size, |
3438 | unsigned long *offset, | |
3439 | char **modname, | |
3440 | char *namebuf) | |
1da177e4 LT |
3441 | { |
3442 | struct module *mod; | |
cb2a5205 | 3443 | const char *ret = NULL; |
1da177e4 | 3444 | |
cb2a5205 | 3445 | preempt_disable(); |
d72b3751 | 3446 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3447 | if (mod->state == MODULE_STATE_UNFORMED) |
3448 | continue; | |
a06f6211 MH |
3449 | if (within_module_init(addr, mod) || |
3450 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
3451 | if (modname) |
3452 | *modname = mod->name; | |
cb2a5205 RR |
3453 | ret = get_ksymbol(mod, addr, size, offset); |
3454 | break; | |
1da177e4 LT |
3455 | } |
3456 | } | |
6dd06c9f RR |
3457 | /* Make a copy in here where it's safe */ |
3458 | if (ret) { | |
3459 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3460 | ret = namebuf; | |
3461 | } | |
cb2a5205 | 3462 | preempt_enable(); |
92dfc9dc | 3463 | return ret; |
1da177e4 LT |
3464 | } |
3465 | ||
9d65cb4a AD |
3466 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3467 | { | |
3468 | struct module *mod; | |
3469 | ||
cb2a5205 | 3470 | preempt_disable(); |
d72b3751 | 3471 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3472 | if (mod->state == MODULE_STATE_UNFORMED) |
3473 | continue; | |
a06f6211 MH |
3474 | if (within_module_init(addr, mod) || |
3475 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
3476 | const char *sym; |
3477 | ||
3478 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3479 | if (!sym) | |
3480 | goto out; | |
9281acea | 3481 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3482 | preempt_enable(); |
9d65cb4a AD |
3483 | return 0; |
3484 | } | |
3485 | } | |
3486 | out: | |
cb2a5205 | 3487 | preempt_enable(); |
9d65cb4a AD |
3488 | return -ERANGE; |
3489 | } | |
3490 | ||
a5c43dae AD |
3491 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3492 | unsigned long *offset, char *modname, char *name) | |
3493 | { | |
3494 | struct module *mod; | |
3495 | ||
cb2a5205 | 3496 | preempt_disable(); |
d72b3751 | 3497 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3498 | if (mod->state == MODULE_STATE_UNFORMED) |
3499 | continue; | |
a06f6211 MH |
3500 | if (within_module_init(addr, mod) || |
3501 | within_module_core(addr, mod)) { | |
a5c43dae AD |
3502 | const char *sym; |
3503 | ||
3504 | sym = get_ksymbol(mod, addr, size, offset); | |
3505 | if (!sym) | |
3506 | goto out; | |
3507 | if (modname) | |
9281acea | 3508 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3509 | if (name) |
9281acea | 3510 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3511 | preempt_enable(); |
a5c43dae AD |
3512 | return 0; |
3513 | } | |
3514 | } | |
3515 | out: | |
cb2a5205 | 3516 | preempt_enable(); |
a5c43dae AD |
3517 | return -ERANGE; |
3518 | } | |
3519 | ||
ea07890a AD |
3520 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3521 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3522 | { |
3523 | struct module *mod; | |
3524 | ||
cb2a5205 | 3525 | preempt_disable(); |
d72b3751 | 3526 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3527 | if (mod->state == MODULE_STATE_UNFORMED) |
3528 | continue; | |
1da177e4 LT |
3529 | if (symnum < mod->num_symtab) { |
3530 | *value = mod->symtab[symnum].st_value; | |
3531 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 3532 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
3533 | KSYM_NAME_LEN); |
3534 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 3535 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3536 | preempt_enable(); |
ea07890a | 3537 | return 0; |
1da177e4 LT |
3538 | } |
3539 | symnum -= mod->num_symtab; | |
3540 | } | |
cb2a5205 | 3541 | preempt_enable(); |
ea07890a | 3542 | return -ERANGE; |
1da177e4 LT |
3543 | } |
3544 | ||
3545 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3546 | { | |
3547 | unsigned int i; | |
3548 | ||
3549 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
3550 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3551 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
3552 | return mod->symtab[i].st_value; |
3553 | return 0; | |
3554 | } | |
3555 | ||
3556 | /* Look for this name: can be of form module:name. */ | |
3557 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3558 | { | |
3559 | struct module *mod; | |
3560 | char *colon; | |
3561 | unsigned long ret = 0; | |
3562 | ||
3563 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3564 | preempt_disable(); |
1da177e4 LT |
3565 | if ((colon = strchr(name, ':')) != NULL) { |
3566 | *colon = '\0'; | |
3567 | if ((mod = find_module(name)) != NULL) | |
3568 | ret = mod_find_symname(mod, colon+1); | |
3569 | *colon = ':'; | |
3570 | } else { | |
0d21b0e3 RR |
3571 | list_for_each_entry_rcu(mod, &modules, list) { |
3572 | if (mod->state == MODULE_STATE_UNFORMED) | |
3573 | continue; | |
1da177e4 LT |
3574 | if ((ret = mod_find_symname(mod, name)) != 0) |
3575 | break; | |
0d21b0e3 | 3576 | } |
1da177e4 | 3577 | } |
cb2a5205 | 3578 | preempt_enable(); |
1da177e4 LT |
3579 | return ret; |
3580 | } | |
75a66614 AK |
3581 | |
3582 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3583 | struct module *, unsigned long), | |
3584 | void *data) | |
3585 | { | |
3586 | struct module *mod; | |
3587 | unsigned int i; | |
3588 | int ret; | |
3589 | ||
3590 | list_for_each_entry(mod, &modules, list) { | |
0d21b0e3 RR |
3591 | if (mod->state == MODULE_STATE_UNFORMED) |
3592 | continue; | |
75a66614 AK |
3593 | for (i = 0; i < mod->num_symtab; i++) { |
3594 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3595 | mod, mod->symtab[i].st_value); | |
3596 | if (ret != 0) | |
3597 | return ret; | |
3598 | } | |
3599 | } | |
3600 | return 0; | |
3601 | } | |
1da177e4 LT |
3602 | #endif /* CONFIG_KALLSYMS */ |
3603 | ||
21aa9280 | 3604 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3605 | { |
3606 | int bx = 0; | |
3607 | ||
0d21b0e3 | 3608 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
3609 | if (mod->taints || |
3610 | mod->state == MODULE_STATE_GOING || | |
3611 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3612 | buf[bx++] = '('; |
cca3e707 | 3613 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
3614 | /* Show a - for module-is-being-unloaded */ |
3615 | if (mod->state == MODULE_STATE_GOING) | |
3616 | buf[bx++] = '-'; | |
3617 | /* Show a + for module-is-being-loaded */ | |
3618 | if (mod->state == MODULE_STATE_COMING) | |
3619 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3620 | buf[bx++] = ')'; |
3621 | } | |
3622 | buf[bx] = '\0'; | |
3623 | ||
3624 | return buf; | |
3625 | } | |
3626 | ||
3b5d5c6b AD |
3627 | #ifdef CONFIG_PROC_FS |
3628 | /* Called by the /proc file system to return a list of modules. */ | |
3629 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3630 | { | |
3631 | mutex_lock(&module_mutex); | |
3632 | return seq_list_start(&modules, *pos); | |
3633 | } | |
3634 | ||
3635 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3636 | { | |
3637 | return seq_list_next(p, &modules, pos); | |
3638 | } | |
3639 | ||
3640 | static void m_stop(struct seq_file *m, void *p) | |
3641 | { | |
3642 | mutex_unlock(&module_mutex); | |
3643 | } | |
3644 | ||
1da177e4 LT |
3645 | static int m_show(struct seq_file *m, void *p) |
3646 | { | |
3647 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3648 | char buf[8]; |
3649 | ||
0d21b0e3 RR |
3650 | /* We always ignore unformed modules. */ |
3651 | if (mod->state == MODULE_STATE_UNFORMED) | |
3652 | return 0; | |
3653 | ||
2f0f2a33 | 3654 | seq_printf(m, "%s %u", |
1da177e4 LT |
3655 | mod->name, mod->init_size + mod->core_size); |
3656 | print_unload_info(m, mod); | |
3657 | ||
3658 | /* Informative for users. */ | |
3659 | seq_printf(m, " %s", | |
3660 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
3661 | mod->state == MODULE_STATE_COMING ? "Loading": | |
3662 | "Live"); | |
3663 | /* Used by oprofile and other similar tools. */ | |
9f36e2c4 | 3664 | seq_printf(m, " 0x%pK", mod->module_core); |
1da177e4 | 3665 | |
fa3ba2e8 FM |
3666 | /* Taints info */ |
3667 | if (mod->taints) | |
21aa9280 | 3668 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3669 | |
1da177e4 LT |
3670 | seq_printf(m, "\n"); |
3671 | return 0; | |
3672 | } | |
3673 | ||
3674 | /* Format: modulename size refcount deps address | |
3675 | ||
3676 | Where refcount is a number or -, and deps is a comma-separated list | |
3677 | of depends or -. | |
3678 | */ | |
3b5d5c6b | 3679 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3680 | .start = m_start, |
3681 | .next = m_next, | |
3682 | .stop = m_stop, | |
3683 | .show = m_show | |
3684 | }; | |
3685 | ||
3b5d5c6b AD |
3686 | static int modules_open(struct inode *inode, struct file *file) |
3687 | { | |
3688 | return seq_open(file, &modules_op); | |
3689 | } | |
3690 | ||
3691 | static const struct file_operations proc_modules_operations = { | |
3692 | .open = modules_open, | |
3693 | .read = seq_read, | |
3694 | .llseek = seq_lseek, | |
3695 | .release = seq_release, | |
3696 | }; | |
3697 | ||
3698 | static int __init proc_modules_init(void) | |
3699 | { | |
3700 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3701 | return 0; | |
3702 | } | |
3703 | module_init(proc_modules_init); | |
3704 | #endif | |
3705 | ||
1da177e4 LT |
3706 | /* Given an address, look for it in the module exception tables. */ |
3707 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3708 | { | |
1da177e4 LT |
3709 | const struct exception_table_entry *e = NULL; |
3710 | struct module *mod; | |
3711 | ||
24da1cbf | 3712 | preempt_disable(); |
d72b3751 | 3713 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3714 | if (mod->state == MODULE_STATE_UNFORMED) |
3715 | continue; | |
1da177e4 LT |
3716 | if (mod->num_exentries == 0) |
3717 | continue; | |
22a8bdeb | 3718 | |
1da177e4 LT |
3719 | e = search_extable(mod->extable, |
3720 | mod->extable + mod->num_exentries - 1, | |
3721 | addr); | |
3722 | if (e) | |
3723 | break; | |
3724 | } | |
24da1cbf | 3725 | preempt_enable(); |
1da177e4 LT |
3726 | |
3727 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3728 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3729 | return e; |
3730 | } | |
3731 | ||
4d435f9d | 3732 | /* |
e610499e RR |
3733 | * is_module_address - is this address inside a module? |
3734 | * @addr: the address to check. | |
3735 | * | |
3736 | * See is_module_text_address() if you simply want to see if the address | |
3737 | * is code (not data). | |
4d435f9d | 3738 | */ |
e610499e | 3739 | bool is_module_address(unsigned long addr) |
4d435f9d | 3740 | { |
e610499e | 3741 | bool ret; |
4d435f9d | 3742 | |
24da1cbf | 3743 | preempt_disable(); |
e610499e | 3744 | ret = __module_address(addr) != NULL; |
24da1cbf | 3745 | preempt_enable(); |
4d435f9d | 3746 | |
e610499e | 3747 | return ret; |
4d435f9d IM |
3748 | } |
3749 | ||
e610499e RR |
3750 | /* |
3751 | * __module_address - get the module which contains an address. | |
3752 | * @addr: the address. | |
3753 | * | |
3754 | * Must be called with preempt disabled or module mutex held so that | |
3755 | * module doesn't get freed during this. | |
3756 | */ | |
714f83d5 | 3757 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3758 | { |
3759 | struct module *mod; | |
3760 | ||
3a642e99 RR |
3761 | if (addr < module_addr_min || addr > module_addr_max) |
3762 | return NULL; | |
3763 | ||
0d21b0e3 RR |
3764 | list_for_each_entry_rcu(mod, &modules, list) { |
3765 | if (mod->state == MODULE_STATE_UNFORMED) | |
3766 | continue; | |
e610499e RR |
3767 | if (within_module_core(addr, mod) |
3768 | || within_module_init(addr, mod)) | |
1da177e4 | 3769 | return mod; |
0d21b0e3 | 3770 | } |
1da177e4 LT |
3771 | return NULL; |
3772 | } | |
c6b37801 | 3773 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3774 | |
e610499e RR |
3775 | /* |
3776 | * is_module_text_address - is this address inside module code? | |
3777 | * @addr: the address to check. | |
3778 | * | |
3779 | * See is_module_address() if you simply want to see if the address is | |
3780 | * anywhere in a module. See kernel_text_address() for testing if an | |
3781 | * address corresponds to kernel or module code. | |
3782 | */ | |
3783 | bool is_module_text_address(unsigned long addr) | |
3784 | { | |
3785 | bool ret; | |
3786 | ||
3787 | preempt_disable(); | |
3788 | ret = __module_text_address(addr) != NULL; | |
3789 | preempt_enable(); | |
3790 | ||
3791 | return ret; | |
3792 | } | |
3793 | ||
3794 | /* | |
3795 | * __module_text_address - get the module whose code contains an address. | |
3796 | * @addr: the address. | |
3797 | * | |
3798 | * Must be called with preempt disabled or module mutex held so that | |
3799 | * module doesn't get freed during this. | |
3800 | */ | |
3801 | struct module *__module_text_address(unsigned long addr) | |
3802 | { | |
3803 | struct module *mod = __module_address(addr); | |
3804 | if (mod) { | |
3805 | /* Make sure it's within the text section. */ | |
3806 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3807 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3808 | mod = NULL; | |
3809 | } | |
3810 | return mod; | |
3811 | } | |
c6b37801 | 3812 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3813 | |
1da177e4 LT |
3814 | /* Don't grab lock, we're oopsing. */ |
3815 | void print_modules(void) | |
3816 | { | |
3817 | struct module *mod; | |
2bc2d61a | 3818 | char buf[8]; |
1da177e4 | 3819 | |
b231125a | 3820 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3821 | /* Most callers should already have preempt disabled, but make sure */ |
3822 | preempt_disable(); | |
0d21b0e3 RR |
3823 | list_for_each_entry_rcu(mod, &modules, list) { |
3824 | if (mod->state == MODULE_STATE_UNFORMED) | |
3825 | continue; | |
21aa9280 | 3826 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 3827 | } |
d72b3751 | 3828 | preempt_enable(); |
e14af7ee AV |
3829 | if (last_unloaded_module[0]) |
3830 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3831 | printk("\n"); |
3832 | } | |
3833 | ||
1da177e4 | 3834 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3835 | /* Generate the signature for all relevant module structures here. |
3836 | * If these change, we don't want to try to parse the module. */ | |
3837 | void module_layout(struct module *mod, | |
3838 | struct modversion_info *ver, | |
3839 | struct kernel_param *kp, | |
3840 | struct kernel_symbol *ks, | |
65498646 | 3841 | struct tracepoint * const *tp) |
8c8ef42a RR |
3842 | { |
3843 | } | |
3844 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3845 | #endif |