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 | 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 = { | |
0ce81409 | 139 | .flags = KERNEL_PARAM_FL_NOARG, |
106a4ee2 RR |
140 | .set = param_set_bool_enable_only, |
141 | .get = param_get_bool, | |
142 | }; | |
143 | #define param_check_bool_enable_only param_check_bool | |
144 | ||
145 | module_param(sig_enforce, bool_enable_only, 0644); | |
146 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
147 | #endif /* CONFIG_MODULE_SIG */ | |
1da177e4 | 148 | |
19e4529e SR |
149 | /* Block module loading/unloading? */ |
150 | int modules_disabled = 0; | |
02608bef | 151 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 152 | |
c9a3ba55 RR |
153 | /* Waiting for a module to finish initializing? */ |
154 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
155 | ||
e041c683 | 156 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 157 | |
75676500 RR |
158 | /* Bounds of module allocation, for speeding __module_address. |
159 | * Protected by module_mutex. */ | |
3a642e99 RR |
160 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
161 | ||
1da177e4 LT |
162 | int register_module_notifier(struct notifier_block * nb) |
163 | { | |
e041c683 | 164 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
165 | } |
166 | EXPORT_SYMBOL(register_module_notifier); | |
167 | ||
168 | int unregister_module_notifier(struct notifier_block * nb) | |
169 | { | |
e041c683 | 170 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
171 | } |
172 | EXPORT_SYMBOL(unregister_module_notifier); | |
173 | ||
eded41c1 RR |
174 | struct load_info { |
175 | Elf_Ehdr *hdr; | |
176 | unsigned long len; | |
177 | Elf_Shdr *sechdrs; | |
6526c534 | 178 | char *secstrings, *strtab; |
d913188c | 179 | unsigned long symoffs, stroffs; |
811d66a0 RR |
180 | struct _ddebug *debug; |
181 | unsigned int num_debug; | |
106a4ee2 | 182 | bool sig_ok; |
eded41c1 RR |
183 | struct { |
184 | unsigned int sym, str, mod, vers, info, pcpu; | |
185 | } index; | |
186 | }; | |
187 | ||
9a4b9708 ML |
188 | /* We require a truly strong try_module_get(): 0 means failure due to |
189 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
190 | static inline int strong_try_module_get(struct module *mod) |
191 | { | |
0d21b0e3 | 192 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 193 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
194 | return -EBUSY; |
195 | if (try_module_get(mod)) | |
1da177e4 | 196 | return 0; |
c9a3ba55 RR |
197 | else |
198 | return -ENOENT; | |
1da177e4 LT |
199 | } |
200 | ||
373d4d09 RR |
201 | static inline void add_taint_module(struct module *mod, unsigned flag, |
202 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 203 | { |
373d4d09 | 204 | add_taint(flag, lockdep_ok); |
25ddbb18 | 205 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
206 | } |
207 | ||
02a3e59a RD |
208 | /* |
209 | * A thread that wants to hold a reference to a module only while it | |
210 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
211 | */ |
212 | void __module_put_and_exit(struct module *mod, long code) | |
213 | { | |
214 | module_put(mod); | |
215 | do_exit(code); | |
216 | } | |
217 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 218 | |
1da177e4 | 219 | /* Find a module section: 0 means not found. */ |
49668688 | 220 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
221 | { |
222 | unsigned int i; | |
223 | ||
49668688 RR |
224 | for (i = 1; i < info->hdr->e_shnum; i++) { |
225 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 226 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
227 | if ((shdr->sh_flags & SHF_ALLOC) |
228 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 229 | return i; |
49668688 | 230 | } |
1da177e4 LT |
231 | return 0; |
232 | } | |
233 | ||
5e458cc0 | 234 | /* Find a module section, or NULL. */ |
49668688 | 235 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
236 | { |
237 | /* Section 0 has sh_addr 0. */ | |
49668688 | 238 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
239 | } |
240 | ||
241 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 242 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
243 | const char *name, |
244 | size_t object_size, | |
245 | unsigned int *num) | |
246 | { | |
49668688 | 247 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
248 | |
249 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
250 | *num = info->sechdrs[sec].sh_size / object_size; |
251 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
252 | } |
253 | ||
1da177e4 LT |
254 | /* Provided by the linker */ |
255 | extern const struct kernel_symbol __start___ksymtab[]; | |
256 | extern const struct kernel_symbol __stop___ksymtab[]; | |
257 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
258 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
259 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
260 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
261 | extern const unsigned long __start___kcrctab[]; |
262 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 263 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
264 | #ifdef CONFIG_UNUSED_SYMBOLS |
265 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
266 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
267 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
268 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
269 | extern const unsigned long __start___kcrctab_unused[]; |
270 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 271 | #endif |
1da177e4 LT |
272 | |
273 | #ifndef CONFIG_MODVERSIONS | |
274 | #define symversion(base, idx) NULL | |
275 | #else | |
f83ca9fe | 276 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
277 | #endif |
278 | ||
dafd0940 RR |
279 | static bool each_symbol_in_section(const struct symsearch *arr, |
280 | unsigned int arrsize, | |
281 | struct module *owner, | |
282 | bool (*fn)(const struct symsearch *syms, | |
283 | struct module *owner, | |
de4d8d53 | 284 | void *data), |
dafd0940 | 285 | void *data) |
ad9546c9 | 286 | { |
de4d8d53 | 287 | unsigned int j; |
ad9546c9 | 288 | |
dafd0940 | 289 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
290 | if (fn(&arr[j], owner, data)) |
291 | return true; | |
f71d20e9 | 292 | } |
dafd0940 RR |
293 | |
294 | return false; | |
ad9546c9 RR |
295 | } |
296 | ||
dafd0940 | 297 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
298 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
299 | struct module *owner, | |
300 | void *data), | |
301 | void *data) | |
ad9546c9 RR |
302 | { |
303 | struct module *mod; | |
44032e63 | 304 | static const struct symsearch arr[] = { |
ad9546c9 | 305 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 306 | NOT_GPL_ONLY, false }, |
ad9546c9 | 307 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
308 | __start___kcrctab_gpl, |
309 | GPL_ONLY, false }, | |
ad9546c9 | 310 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
311 | __start___kcrctab_gpl_future, |
312 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 313 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 314 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
315 | __start___kcrctab_unused, |
316 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 317 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
318 | __start___kcrctab_unused_gpl, |
319 | GPL_ONLY, true }, | |
f7f5b675 | 320 | #endif |
ad9546c9 | 321 | }; |
f71d20e9 | 322 | |
dafd0940 RR |
323 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
324 | return true; | |
f71d20e9 | 325 | |
d72b3751 | 326 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
327 | struct symsearch arr[] = { |
328 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 329 | NOT_GPL_ONLY, false }, |
ad9546c9 | 330 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
331 | mod->gpl_crcs, |
332 | GPL_ONLY, false }, | |
ad9546c9 RR |
333 | { mod->gpl_future_syms, |
334 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
335 | mod->gpl_future_crcs, |
336 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 337 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
338 | { mod->unused_syms, |
339 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
340 | mod->unused_crcs, |
341 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
342 | { mod->unused_gpl_syms, |
343 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
344 | mod->unused_gpl_crcs, |
345 | GPL_ONLY, true }, | |
f7f5b675 | 346 | #endif |
ad9546c9 RR |
347 | }; |
348 | ||
0d21b0e3 RR |
349 | if (mod->state == MODULE_STATE_UNFORMED) |
350 | continue; | |
351 | ||
dafd0940 RR |
352 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
353 | return true; | |
354 | } | |
355 | return false; | |
356 | } | |
de4d8d53 | 357 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
358 | |
359 | struct find_symbol_arg { | |
360 | /* Input */ | |
361 | const char *name; | |
362 | bool gplok; | |
363 | bool warn; | |
364 | ||
365 | /* Output */ | |
366 | struct module *owner; | |
367 | const unsigned long *crc; | |
414fd31b | 368 | const struct kernel_symbol *sym; |
dafd0940 RR |
369 | }; |
370 | ||
de4d8d53 RR |
371 | static bool check_symbol(const struct symsearch *syms, |
372 | struct module *owner, | |
373 | unsigned int symnum, void *data) | |
dafd0940 RR |
374 | { |
375 | struct find_symbol_arg *fsa = data; | |
376 | ||
dafd0940 RR |
377 | if (!fsa->gplok) { |
378 | if (syms->licence == GPL_ONLY) | |
379 | return false; | |
380 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
381 | pr_warn("Symbol %s is being used by a non-GPL module, " |
382 | "which will not be allowed in the future\n", | |
383 | fsa->name); | |
9f28bb7e | 384 | } |
1da177e4 | 385 | } |
ad9546c9 | 386 | |
f7f5b675 | 387 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 388 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
389 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
390 | "using it.\n", fsa->name); | |
391 | pr_warn("This symbol will go away in the future.\n"); | |
392 | pr_warn("Please evalute if this is the right api to use and if " | |
393 | "it really is, submit a report the linux kernel " | |
394 | "mailinglist together with submitting your code for " | |
395 | "inclusion.\n"); | |
dafd0940 | 396 | } |
f7f5b675 | 397 | #endif |
dafd0940 RR |
398 | |
399 | fsa->owner = owner; | |
400 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 401 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
402 | return true; |
403 | } | |
404 | ||
403ed278 AIB |
405 | static int cmp_name(const void *va, const void *vb) |
406 | { | |
407 | const char *a; | |
408 | const struct kernel_symbol *b; | |
409 | a = va; b = vb; | |
410 | return strcmp(a, b->name); | |
411 | } | |
412 | ||
de4d8d53 RR |
413 | static bool find_symbol_in_section(const struct symsearch *syms, |
414 | struct module *owner, | |
415 | void *data) | |
416 | { | |
417 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
418 | struct kernel_symbol *sym; |
419 | ||
420 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
421 | sizeof(struct kernel_symbol), cmp_name); | |
422 | ||
423 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
424 | return true; | |
de4d8d53 | 425 | |
de4d8d53 RR |
426 | return false; |
427 | } | |
428 | ||
414fd31b | 429 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 430 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
431 | const struct kernel_symbol *find_symbol(const char *name, |
432 | struct module **owner, | |
433 | const unsigned long **crc, | |
434 | bool gplok, | |
435 | bool warn) | |
dafd0940 RR |
436 | { |
437 | struct find_symbol_arg fsa; | |
438 | ||
439 | fsa.name = name; | |
440 | fsa.gplok = gplok; | |
441 | fsa.warn = warn; | |
442 | ||
de4d8d53 | 443 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
444 | if (owner) |
445 | *owner = fsa.owner; | |
446 | if (crc) | |
447 | *crc = fsa.crc; | |
414fd31b | 448 | return fsa.sym; |
dafd0940 RR |
449 | } |
450 | ||
5e124169 | 451 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 452 | return NULL; |
1da177e4 | 453 | } |
c6b37801 | 454 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 455 | |
1da177e4 | 456 | /* Search for module by name: must hold module_mutex. */ |
4f6de4d5 | 457 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 458 | bool even_unformed) |
1da177e4 LT |
459 | { |
460 | struct module *mod; | |
461 | ||
462 | list_for_each_entry(mod, &modules, list) { | |
0d21b0e3 RR |
463 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
464 | continue; | |
4f6de4d5 | 465 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
466 | return mod; |
467 | } | |
468 | return NULL; | |
469 | } | |
0d21b0e3 RR |
470 | |
471 | struct module *find_module(const char *name) | |
472 | { | |
4f6de4d5 | 473 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 474 | } |
c6b37801 | 475 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
476 | |
477 | #ifdef CONFIG_SMP | |
fbf59bc9 | 478 | |
259354de | 479 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 480 | { |
259354de TH |
481 | return mod->percpu; |
482 | } | |
fbf59bc9 | 483 | |
9eb76d77 | 484 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 485 | { |
9eb76d77 RR |
486 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
487 | unsigned long align = pcpusec->sh_addralign; | |
488 | ||
489 | if (!pcpusec->sh_size) | |
490 | return 0; | |
491 | ||
fbf59bc9 | 492 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
493 | pr_warn("%s: per-cpu alignment %li > %li\n", |
494 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
495 | align = PAGE_SIZE; |
496 | } | |
497 | ||
9eb76d77 | 498 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 499 | if (!mod->percpu) { |
bddb12b3 AM |
500 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
501 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
502 | return -ENOMEM; |
503 | } | |
9eb76d77 | 504 | mod->percpu_size = pcpusec->sh_size; |
259354de | 505 | return 0; |
fbf59bc9 TH |
506 | } |
507 | ||
259354de | 508 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 509 | { |
259354de | 510 | free_percpu(mod->percpu); |
fbf59bc9 TH |
511 | } |
512 | ||
49668688 | 513 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 514 | { |
49668688 | 515 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
516 | } |
517 | ||
259354de TH |
518 | static void percpu_modcopy(struct module *mod, |
519 | const void *from, unsigned long size) | |
6b588c18 TH |
520 | { |
521 | int cpu; | |
522 | ||
523 | for_each_possible_cpu(cpu) | |
259354de | 524 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
525 | } |
526 | ||
10fad5e4 TH |
527 | /** |
528 | * is_module_percpu_address - test whether address is from module static percpu | |
529 | * @addr: address to test | |
530 | * | |
531 | * Test whether @addr belongs to module static percpu area. | |
532 | * | |
533 | * RETURNS: | |
534 | * %true if @addr is from module static percpu area | |
535 | */ | |
536 | bool is_module_percpu_address(unsigned long addr) | |
537 | { | |
538 | struct module *mod; | |
539 | unsigned int cpu; | |
540 | ||
541 | preempt_disable(); | |
542 | ||
543 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
544 | if (mod->state == MODULE_STATE_UNFORMED) |
545 | continue; | |
10fad5e4 TH |
546 | if (!mod->percpu_size) |
547 | continue; | |
548 | for_each_possible_cpu(cpu) { | |
549 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
550 | ||
551 | if ((void *)addr >= start && | |
552 | (void *)addr < start + mod->percpu_size) { | |
553 | preempt_enable(); | |
554 | return true; | |
555 | } | |
556 | } | |
557 | } | |
558 | ||
559 | preempt_enable(); | |
560 | return false; | |
6b588c18 TH |
561 | } |
562 | ||
1da177e4 | 563 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 564 | |
259354de | 565 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
566 | { |
567 | return NULL; | |
568 | } | |
9eb76d77 | 569 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 570 | { |
9eb76d77 RR |
571 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
572 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
573 | return -ENOMEM; | |
574 | return 0; | |
259354de TH |
575 | } |
576 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 577 | { |
1da177e4 | 578 | } |
49668688 | 579 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
580 | { |
581 | return 0; | |
582 | } | |
259354de TH |
583 | static inline void percpu_modcopy(struct module *mod, |
584 | const void *from, unsigned long size) | |
1da177e4 LT |
585 | { |
586 | /* pcpusec should be 0, and size of that section should be 0. */ | |
587 | BUG_ON(size != 0); | |
588 | } | |
10fad5e4 TH |
589 | bool is_module_percpu_address(unsigned long addr) |
590 | { | |
591 | return false; | |
592 | } | |
6b588c18 | 593 | |
1da177e4 LT |
594 | #endif /* CONFIG_SMP */ |
595 | ||
c988d2b2 MD |
596 | #define MODINFO_ATTR(field) \ |
597 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
598 | { \ | |
599 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
600 | } \ | |
601 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 602 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 603 | { \ |
cc56ded3 | 604 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
605 | } \ |
606 | static int modinfo_##field##_exists(struct module *mod) \ | |
607 | { \ | |
608 | return mod->field != NULL; \ | |
609 | } \ | |
610 | static void free_modinfo_##field(struct module *mod) \ | |
611 | { \ | |
22a8bdeb DW |
612 | kfree(mod->field); \ |
613 | mod->field = NULL; \ | |
c988d2b2 MD |
614 | } \ |
615 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 616 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
617 | .show = show_modinfo_##field, \ |
618 | .setup = setup_modinfo_##field, \ | |
619 | .test = modinfo_##field##_exists, \ | |
620 | .free = free_modinfo_##field, \ | |
621 | }; | |
622 | ||
623 | MODINFO_ATTR(version); | |
624 | MODINFO_ATTR(srcversion); | |
625 | ||
e14af7ee AV |
626 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
627 | ||
03e88ae1 | 628 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
629 | |
630 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
631 | ||
1da177e4 | 632 | /* Init the unload section of the module. */ |
9f85a4bb | 633 | static int module_unload_init(struct module *mod) |
1da177e4 | 634 | { |
9f85a4bb RR |
635 | mod->refptr = alloc_percpu(struct module_ref); |
636 | if (!mod->refptr) | |
637 | return -ENOMEM; | |
638 | ||
2c02dfe7 LT |
639 | INIT_LIST_HEAD(&mod->source_list); |
640 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 641 | |
1da177e4 | 642 | /* Hold reference count during initialization. */ |
5fbfb18d | 643 | __this_cpu_write(mod->refptr->incs, 1); |
9f85a4bb RR |
644 | |
645 | return 0; | |
1da177e4 LT |
646 | } |
647 | ||
1da177e4 LT |
648 | /* Does a already use b? */ |
649 | static int already_uses(struct module *a, struct module *b) | |
650 | { | |
651 | struct module_use *use; | |
652 | ||
2c02dfe7 LT |
653 | list_for_each_entry(use, &b->source_list, source_list) { |
654 | if (use->source == a) { | |
5e124169 | 655 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
656 | return 1; |
657 | } | |
658 | } | |
5e124169 | 659 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
660 | return 0; |
661 | } | |
662 | ||
2c02dfe7 LT |
663 | /* |
664 | * Module a uses b | |
665 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
666 | * - the module_use is added to the list of 'b' sources (so | |
667 | * 'b' can walk the list to see who sourced them), and of 'a' | |
668 | * targets (so 'a' can see what modules it targets). | |
669 | */ | |
670 | static int add_module_usage(struct module *a, struct module *b) | |
671 | { | |
2c02dfe7 LT |
672 | struct module_use *use; |
673 | ||
5e124169 | 674 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
675 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
676 | if (!use) { | |
bddb12b3 | 677 | pr_warn("%s: out of memory loading\n", a->name); |
2c02dfe7 LT |
678 | return -ENOMEM; |
679 | } | |
680 | ||
681 | use->source = a; | |
682 | use->target = b; | |
683 | list_add(&use->source_list, &b->source_list); | |
684 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
685 | return 0; |
686 | } | |
687 | ||
75676500 | 688 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 689 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 690 | { |
c8e21ced | 691 | int err; |
270a6c4c | 692 | |
9bea7f23 | 693 | if (b == NULL || already_uses(a, b)) |
218ce735 | 694 | return 0; |
218ce735 | 695 | |
9bea7f23 RR |
696 | /* If module isn't available, we fail. */ |
697 | err = strong_try_module_get(b); | |
c9a3ba55 | 698 | if (err) |
9bea7f23 | 699 | return err; |
1da177e4 | 700 | |
2c02dfe7 LT |
701 | err = add_module_usage(a, b); |
702 | if (err) { | |
1da177e4 | 703 | module_put(b); |
9bea7f23 | 704 | return err; |
1da177e4 | 705 | } |
9bea7f23 | 706 | return 0; |
1da177e4 | 707 | } |
9bea7f23 | 708 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
709 | |
710 | /* Clear the unload stuff of the module. */ | |
711 | static void module_unload_free(struct module *mod) | |
712 | { | |
2c02dfe7 | 713 | struct module_use *use, *tmp; |
1da177e4 | 714 | |
75676500 | 715 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
716 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
717 | struct module *i = use->target; | |
5e124169 | 718 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
719 | module_put(i); |
720 | list_del(&use->source_list); | |
721 | list_del(&use->target_list); | |
722 | kfree(use); | |
1da177e4 | 723 | } |
75676500 | 724 | mutex_unlock(&module_mutex); |
9f85a4bb RR |
725 | |
726 | free_percpu(mod->refptr); | |
1da177e4 LT |
727 | } |
728 | ||
729 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 730 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
731 | { |
732 | int ret = (flags & O_TRUNC); | |
733 | if (ret) | |
373d4d09 | 734 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
735 | return ret; |
736 | } | |
737 | #else | |
fb169793 | 738 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
739 | { |
740 | return 0; | |
741 | } | |
742 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
743 | ||
744 | struct stopref | |
745 | { | |
746 | struct module *mod; | |
747 | int flags; | |
748 | int *forced; | |
749 | }; | |
750 | ||
751 | /* Whole machine is stopped with interrupts off when this runs. */ | |
752 | static int __try_stop_module(void *_sref) | |
753 | { | |
754 | struct stopref *sref = _sref; | |
755 | ||
da39ba5e RR |
756 | /* If it's not unused, quit unless we're forcing. */ |
757 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 758 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
759 | return -EWOULDBLOCK; |
760 | } | |
761 | ||
762 | /* Mark it as dying. */ | |
763 | sref->mod->state = MODULE_STATE_GOING; | |
764 | return 0; | |
765 | } | |
766 | ||
767 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
768 | { | |
3f2b9c9c | 769 | struct stopref sref = { mod, flags, forced }; |
1da177e4 | 770 | |
3f2b9c9c | 771 | return stop_machine(__try_stop_module, &sref, NULL); |
1da177e4 LT |
772 | } |
773 | ||
bd77c047 | 774 | unsigned long module_refcount(struct module *mod) |
1da177e4 | 775 | { |
bd77c047 | 776 | unsigned long incs = 0, decs = 0; |
720eba31 | 777 | int cpu; |
1da177e4 | 778 | |
720eba31 | 779 | for_each_possible_cpu(cpu) |
5fbfb18d NP |
780 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
781 | /* | |
782 | * ensure the incs are added up after the decs. | |
783 | * module_put ensures incs are visible before decs with smp_wmb. | |
784 | * | |
785 | * This 2-count scheme avoids the situation where the refcount | |
786 | * for CPU0 is read, then CPU0 increments the module refcount, | |
787 | * then CPU1 drops that refcount, then the refcount for CPU1 is | |
788 | * read. We would record a decrement but not its corresponding | |
789 | * increment so we would see a low count (disaster). | |
790 | * | |
791 | * Rare situation? But module_refcount can be preempted, and we | |
792 | * might be tallying up 4096+ CPUs. So it is not impossible. | |
793 | */ | |
794 | smp_rmb(); | |
795 | for_each_possible_cpu(cpu) | |
796 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; | |
797 | return incs - decs; | |
1da177e4 LT |
798 | } |
799 | EXPORT_SYMBOL(module_refcount); | |
800 | ||
801 | /* This exists whether we can unload or not */ | |
802 | static void free_module(struct module *mod); | |
803 | ||
17da2bd9 HC |
804 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
805 | unsigned int, flags) | |
1da177e4 LT |
806 | { |
807 | struct module *mod; | |
dfff0a06 | 808 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
809 | int ret, forced = 0; |
810 | ||
3d43321b | 811 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
812 | return -EPERM; |
813 | ||
814 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
815 | return -EFAULT; | |
816 | name[MODULE_NAME_LEN-1] = '\0'; | |
817 | ||
22e66956 TH |
818 | if (!(flags & O_NONBLOCK)) |
819 | pr_warn("waiting module removal not supported: please upgrade\n"); | |
3f2b9c9c | 820 | |
3fc1f1e2 TH |
821 | if (mutex_lock_interruptible(&module_mutex) != 0) |
822 | return -EINTR; | |
1da177e4 LT |
823 | |
824 | mod = find_module(name); | |
825 | if (!mod) { | |
826 | ret = -ENOENT; | |
827 | goto out; | |
828 | } | |
829 | ||
2c02dfe7 | 830 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
831 | /* Other modules depend on us: get rid of them first. */ |
832 | ret = -EWOULDBLOCK; | |
833 | goto out; | |
834 | } | |
835 | ||
836 | /* Doing init or already dying? */ | |
837 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 838 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 839 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
840 | ret = -EBUSY; |
841 | goto out; | |
842 | } | |
843 | ||
844 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 845 | if (mod->init && !mod->exit) { |
fb169793 | 846 | forced = try_force_unload(flags); |
1da177e4 LT |
847 | if (!forced) { |
848 | /* This module can't be removed */ | |
849 | ret = -EBUSY; | |
850 | goto out; | |
851 | } | |
852 | } | |
853 | ||
1da177e4 LT |
854 | /* Stop the machine so refcounts can't move and disable module. */ |
855 | ret = try_stop_module(mod, flags, &forced); | |
856 | if (ret != 0) | |
857 | goto out; | |
858 | ||
df4b565e | 859 | mutex_unlock(&module_mutex); |
25985edc | 860 | /* Final destruction now no one is using it. */ |
df4b565e | 861 | if (mod->exit != NULL) |
1da177e4 | 862 | mod->exit(); |
df4b565e PO |
863 | blocking_notifier_call_chain(&module_notify_list, |
864 | MODULE_STATE_GOING, mod); | |
22a9d645 | 865 | async_synchronize_full(); |
75676500 | 866 | |
e14af7ee | 867 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 868 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 869 | |
75676500 RR |
870 | free_module(mod); |
871 | return 0; | |
872 | out: | |
6389a385 | 873 | mutex_unlock(&module_mutex); |
1da177e4 LT |
874 | return ret; |
875 | } | |
876 | ||
d1e99d7a | 877 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
878 | { |
879 | struct module_use *use; | |
880 | int printed_something = 0; | |
881 | ||
bd77c047 | 882 | seq_printf(m, " %lu ", module_refcount(mod)); |
1da177e4 LT |
883 | |
884 | /* Always include a trailing , so userspace can differentiate | |
885 | between this and the old multi-field proc format. */ | |
2c02dfe7 | 886 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 887 | printed_something = 1; |
2c02dfe7 | 888 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
889 | } |
890 | ||
1da177e4 LT |
891 | if (mod->init != NULL && mod->exit == NULL) { |
892 | printed_something = 1; | |
893 | seq_printf(m, "[permanent],"); | |
894 | } | |
895 | ||
896 | if (!printed_something) | |
897 | seq_printf(m, "-"); | |
898 | } | |
899 | ||
900 | void __symbol_put(const char *symbol) | |
901 | { | |
902 | struct module *owner; | |
1da177e4 | 903 | |
24da1cbf | 904 | preempt_disable(); |
414fd31b | 905 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
906 | BUG(); |
907 | module_put(owner); | |
24da1cbf | 908 | preempt_enable(); |
1da177e4 LT |
909 | } |
910 | EXPORT_SYMBOL(__symbol_put); | |
911 | ||
7d1d16e4 | 912 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
913 | void symbol_put_addr(void *addr) |
914 | { | |
5e376613 | 915 | struct module *modaddr; |
7d1d16e4 | 916 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 917 | |
7d1d16e4 | 918 | if (core_kernel_text(a)) |
5e376613 | 919 | return; |
1da177e4 | 920 | |
a6e6abd5 RR |
921 | /* module_text_address is safe here: we're supposed to have reference |
922 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 923 | modaddr = __module_text_address(a); |
a6e6abd5 | 924 | BUG_ON(!modaddr); |
5e376613 | 925 | module_put(modaddr); |
1da177e4 LT |
926 | } |
927 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
928 | ||
929 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 930 | struct module_kobject *mk, char *buffer) |
1da177e4 | 931 | { |
bd77c047 | 932 | return sprintf(buffer, "%lu\n", module_refcount(mk->mod)); |
1da177e4 LT |
933 | } |
934 | ||
cca3e707 KS |
935 | static struct module_attribute modinfo_refcnt = |
936 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 937 | |
d53799be SR |
938 | void __module_get(struct module *module) |
939 | { | |
940 | if (module) { | |
941 | preempt_disable(); | |
942 | __this_cpu_inc(module->refptr->incs); | |
943 | trace_module_get(module, _RET_IP_); | |
944 | preempt_enable(); | |
945 | } | |
946 | } | |
947 | EXPORT_SYMBOL(__module_get); | |
948 | ||
949 | bool try_module_get(struct module *module) | |
950 | { | |
951 | bool ret = true; | |
952 | ||
953 | if (module) { | |
954 | preempt_disable(); | |
955 | ||
956 | if (likely(module_is_live(module))) { | |
957 | __this_cpu_inc(module->refptr->incs); | |
958 | trace_module_get(module, _RET_IP_); | |
959 | } else | |
960 | ret = false; | |
961 | ||
962 | preempt_enable(); | |
963 | } | |
964 | return ret; | |
965 | } | |
966 | EXPORT_SYMBOL(try_module_get); | |
967 | ||
f6a57033 AV |
968 | void module_put(struct module *module) |
969 | { | |
970 | if (module) { | |
e1783a24 | 971 | preempt_disable(); |
5fbfb18d NP |
972 | smp_wmb(); /* see comment in module_refcount */ |
973 | __this_cpu_inc(module->refptr->decs); | |
e1783a24 | 974 | |
ae832d1e | 975 | trace_module_put(module, _RET_IP_); |
e1783a24 | 976 | preempt_enable(); |
f6a57033 AV |
977 | } |
978 | } | |
979 | EXPORT_SYMBOL(module_put); | |
980 | ||
1da177e4 | 981 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 982 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
983 | { |
984 | /* We don't know the usage count, or what modules are using. */ | |
985 | seq_printf(m, " - -"); | |
986 | } | |
987 | ||
988 | static inline void module_unload_free(struct module *mod) | |
989 | { | |
990 | } | |
991 | ||
9bea7f23 | 992 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 993 | { |
9bea7f23 | 994 | return strong_try_module_get(b); |
1da177e4 | 995 | } |
9bea7f23 | 996 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 997 | |
9f85a4bb | 998 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 999 | { |
9f85a4bb | 1000 | return 0; |
1da177e4 LT |
1001 | } |
1002 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1003 | ||
53999bf3 KW |
1004 | static size_t module_flags_taint(struct module *mod, char *buf) |
1005 | { | |
1006 | size_t l = 0; | |
1007 | ||
1008 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) | |
1009 | buf[l++] = 'P'; | |
1010 | if (mod->taints & (1 << TAINT_OOT_MODULE)) | |
1011 | buf[l++] = 'O'; | |
1012 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) | |
1013 | buf[l++] = 'F'; | |
1014 | if (mod->taints & (1 << TAINT_CRAP)) | |
1015 | buf[l++] = 'C'; | |
1016 | /* | |
1017 | * TAINT_FORCED_RMMOD: could be added. | |
8c90487c | 1018 | * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
53999bf3 KW |
1019 | * apply to modules. |
1020 | */ | |
1021 | return l; | |
1022 | } | |
1023 | ||
1f71740a | 1024 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1025 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1026 | { |
1027 | const char *state = "unknown"; | |
1028 | ||
4befb026 | 1029 | switch (mk->mod->state) { |
1f71740a KS |
1030 | case MODULE_STATE_LIVE: |
1031 | state = "live"; | |
1032 | break; | |
1033 | case MODULE_STATE_COMING: | |
1034 | state = "coming"; | |
1035 | break; | |
1036 | case MODULE_STATE_GOING: | |
1037 | state = "going"; | |
1038 | break; | |
0d21b0e3 RR |
1039 | default: |
1040 | BUG(); | |
1f71740a KS |
1041 | } |
1042 | return sprintf(buffer, "%s\n", state); | |
1043 | } | |
1044 | ||
cca3e707 KS |
1045 | static struct module_attribute modinfo_initstate = |
1046 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1047 | |
88bfa324 KS |
1048 | static ssize_t store_uevent(struct module_attribute *mattr, |
1049 | struct module_kobject *mk, | |
1050 | const char *buffer, size_t count) | |
1051 | { | |
1052 | enum kobject_action action; | |
1053 | ||
1054 | if (kobject_action_type(buffer, count, &action) == 0) | |
1055 | kobject_uevent(&mk->kobj, action); | |
1056 | return count; | |
1057 | } | |
1058 | ||
cca3e707 KS |
1059 | struct module_attribute module_uevent = |
1060 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1061 | ||
1062 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1063 | struct module_kobject *mk, char *buffer) | |
1064 | { | |
1065 | return sprintf(buffer, "%u\n", mk->mod->core_size); | |
1066 | } | |
1067 | ||
1068 | static struct module_attribute modinfo_coresize = | |
1069 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1070 | ||
1071 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1072 | struct module_kobject *mk, char *buffer) | |
1073 | { | |
1074 | return sprintf(buffer, "%u\n", mk->mod->init_size); | |
1075 | } | |
1076 | ||
1077 | static struct module_attribute modinfo_initsize = | |
1078 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1079 | ||
1080 | static ssize_t show_taint(struct module_attribute *mattr, | |
1081 | struct module_kobject *mk, char *buffer) | |
1082 | { | |
1083 | size_t l; | |
1084 | ||
1085 | l = module_flags_taint(mk->mod, buffer); | |
1086 | buffer[l++] = '\n'; | |
1087 | return l; | |
1088 | } | |
1089 | ||
1090 | static struct module_attribute modinfo_taint = | |
1091 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1092 | |
03e88ae1 | 1093 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1094 | &module_uevent, |
03e88ae1 GKH |
1095 | &modinfo_version, |
1096 | &modinfo_srcversion, | |
cca3e707 KS |
1097 | &modinfo_initstate, |
1098 | &modinfo_coresize, | |
1099 | &modinfo_initsize, | |
1100 | &modinfo_taint, | |
03e88ae1 | 1101 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1102 | &modinfo_refcnt, |
03e88ae1 GKH |
1103 | #endif |
1104 | NULL, | |
1105 | }; | |
1106 | ||
1da177e4 LT |
1107 | static const char vermagic[] = VERMAGIC_STRING; |
1108 | ||
c6e665c8 | 1109 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1110 | { |
1111 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1112 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1113 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1114 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1115 | return 0; |
1116 | #else | |
1117 | return -ENOEXEC; | |
1118 | #endif | |
1119 | } | |
1120 | ||
1da177e4 | 1121 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
1122 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1123 | static unsigned long maybe_relocated(unsigned long crc, | |
1124 | const struct module *crc_owner) | |
1125 | { | |
1126 | #ifdef ARCH_RELOCATES_KCRCTAB | |
1127 | if (crc_owner == NULL) | |
1128 | return crc - (unsigned long)reloc_start; | |
1129 | #endif | |
1130 | return crc; | |
1131 | } | |
1132 | ||
1da177e4 LT |
1133 | static int check_version(Elf_Shdr *sechdrs, |
1134 | unsigned int versindex, | |
1135 | const char *symname, | |
1136 | struct module *mod, | |
d4703aef RR |
1137 | const unsigned long *crc, |
1138 | const struct module *crc_owner) | |
1da177e4 LT |
1139 | { |
1140 | unsigned int i, num_versions; | |
1141 | struct modversion_info *versions; | |
1142 | ||
1143 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1144 | if (!crc) | |
1145 | return 1; | |
1146 | ||
a5dd6970 RR |
1147 | /* No versions at all? modprobe --force does this. */ |
1148 | if (versindex == 0) | |
1149 | return try_to_force_load(mod, symname) == 0; | |
1150 | ||
1da177e4 LT |
1151 | versions = (void *) sechdrs[versindex].sh_addr; |
1152 | num_versions = sechdrs[versindex].sh_size | |
1153 | / sizeof(struct modversion_info); | |
1154 | ||
1155 | for (i = 0; i < num_versions; i++) { | |
1156 | if (strcmp(versions[i].name, symname) != 0) | |
1157 | continue; | |
1158 | ||
d4703aef | 1159 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1160 | return 1; |
5e124169 | 1161 | pr_debug("Found checksum %lX vs module %lX\n", |
d4703aef | 1162 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1163 | goto bad_version; |
1da177e4 | 1164 | } |
826e4506 | 1165 | |
bddb12b3 | 1166 | pr_warn("%s: no symbol version for %s\n", mod->name, symname); |
a5dd6970 | 1167 | return 0; |
826e4506 LT |
1168 | |
1169 | bad_version: | |
1170 | printk("%s: disagrees about version of symbol %s\n", | |
1171 | mod->name, symname); | |
1172 | return 0; | |
1da177e4 LT |
1173 | } |
1174 | ||
1175 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1176 | unsigned int versindex, | |
1177 | struct module *mod) | |
1178 | { | |
1179 | const unsigned long *crc; | |
1da177e4 | 1180 | |
75676500 RR |
1181 | /* Since this should be found in kernel (which can't be removed), |
1182 | * no locking is necessary. */ | |
b92021b0 | 1183 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
6560dc16 | 1184 | &crc, true, false)) |
1da177e4 | 1185 | BUG(); |
a4b6a77b JH |
1186 | return check_version(sechdrs, versindex, |
1187 | VMLINUX_SYMBOL_STR(module_layout), mod, crc, | |
d4703aef | 1188 | NULL); |
1da177e4 LT |
1189 | } |
1190 | ||
91e37a79 RR |
1191 | /* First part is kernel version, which we ignore if module has crcs. */ |
1192 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1193 | bool has_crcs) | |
1da177e4 | 1194 | { |
91e37a79 RR |
1195 | if (has_crcs) { |
1196 | amagic += strcspn(amagic, " "); | |
1197 | bmagic += strcspn(bmagic, " "); | |
1198 | } | |
1da177e4 LT |
1199 | return strcmp(amagic, bmagic) == 0; |
1200 | } | |
1201 | #else | |
1202 | static inline int check_version(Elf_Shdr *sechdrs, | |
1203 | unsigned int versindex, | |
1204 | const char *symname, | |
1205 | struct module *mod, | |
d4703aef RR |
1206 | const unsigned long *crc, |
1207 | const struct module *crc_owner) | |
1da177e4 LT |
1208 | { |
1209 | return 1; | |
1210 | } | |
1211 | ||
1212 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1213 | unsigned int versindex, | |
1214 | struct module *mod) | |
1215 | { | |
1216 | return 1; | |
1217 | } | |
1218 | ||
91e37a79 RR |
1219 | static inline int same_magic(const char *amagic, const char *bmagic, |
1220 | bool has_crcs) | |
1da177e4 LT |
1221 | { |
1222 | return strcmp(amagic, bmagic) == 0; | |
1223 | } | |
1224 | #endif /* CONFIG_MODVERSIONS */ | |
1225 | ||
75676500 | 1226 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1227 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1228 | const struct load_info *info, | |
414fd31b | 1229 | const char *name, |
9bea7f23 | 1230 | char ownername[]) |
1da177e4 LT |
1231 | { |
1232 | struct module *owner; | |
414fd31b | 1233 | const struct kernel_symbol *sym; |
1da177e4 | 1234 | const unsigned long *crc; |
9bea7f23 | 1235 | int err; |
1da177e4 | 1236 | |
75676500 | 1237 | mutex_lock(&module_mutex); |
414fd31b | 1238 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1239 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1240 | if (!sym) |
1241 | goto unlock; | |
1242 | ||
49668688 RR |
1243 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1244 | owner)) { | |
9bea7f23 RR |
1245 | sym = ERR_PTR(-EINVAL); |
1246 | goto getname; | |
1da177e4 | 1247 | } |
9bea7f23 RR |
1248 | |
1249 | err = ref_module(mod, owner); | |
1250 | if (err) { | |
1251 | sym = ERR_PTR(err); | |
1252 | goto getname; | |
1253 | } | |
1254 | ||
1255 | getname: | |
1256 | /* We must make copy under the lock if we failed to get ref. */ | |
1257 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1258 | unlock: | |
75676500 | 1259 | mutex_unlock(&module_mutex); |
218ce735 | 1260 | return sym; |
1da177e4 LT |
1261 | } |
1262 | ||
49668688 RR |
1263 | static const struct kernel_symbol * |
1264 | resolve_symbol_wait(struct module *mod, | |
1265 | const struct load_info *info, | |
1266 | const char *name) | |
9bea7f23 RR |
1267 | { |
1268 | const struct kernel_symbol *ksym; | |
49668688 | 1269 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1270 | |
1271 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1272 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1273 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1274 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1275 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1276 | mod->name, owner); | |
9bea7f23 RR |
1277 | } |
1278 | return ksym; | |
1279 | } | |
1280 | ||
1da177e4 LT |
1281 | /* |
1282 | * /sys/module/foo/sections stuff | |
1283 | * J. Corbet <corbet@lwn.net> | |
1284 | */ | |
8f6d0378 | 1285 | #ifdef CONFIG_SYSFS |
10b465aa | 1286 | |
8f6d0378 | 1287 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1288 | static inline bool sect_empty(const Elf_Shdr *sect) |
1289 | { | |
1290 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1291 | } | |
1292 | ||
a58730c4 RR |
1293 | struct module_sect_attr |
1294 | { | |
1295 | struct module_attribute mattr; | |
1296 | char *name; | |
1297 | unsigned long address; | |
1298 | }; | |
1299 | ||
1300 | struct module_sect_attrs | |
1301 | { | |
1302 | struct attribute_group grp; | |
1303 | unsigned int nsections; | |
1304 | struct module_sect_attr attrs[0]; | |
1305 | }; | |
1306 | ||
1da177e4 | 1307 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1308 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1309 | { |
1310 | struct module_sect_attr *sattr = | |
1311 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1312 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1313 | } |
1314 | ||
04b1db9f IN |
1315 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1316 | { | |
a58730c4 | 1317 | unsigned int section; |
04b1db9f IN |
1318 | |
1319 | for (section = 0; section < sect_attrs->nsections; section++) | |
1320 | kfree(sect_attrs->attrs[section].name); | |
1321 | kfree(sect_attrs); | |
1322 | } | |
1323 | ||
8f6d0378 | 1324 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1325 | { |
1326 | unsigned int nloaded = 0, i, size[2]; | |
1327 | struct module_sect_attrs *sect_attrs; | |
1328 | struct module_sect_attr *sattr; | |
1329 | struct attribute **gattr; | |
22a8bdeb | 1330 | |
1da177e4 | 1331 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1332 | for (i = 0; i < info->hdr->e_shnum; i++) |
1333 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1334 | nloaded++; |
1335 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1336 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1337 | sizeof(sect_attrs->grp.attrs[0])); | |
1338 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1339 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1340 | if (sect_attrs == NULL) | |
1da177e4 LT |
1341 | return; |
1342 | ||
1343 | /* Setup section attributes. */ | |
1344 | sect_attrs->grp.name = "sections"; | |
1345 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1346 | ||
04b1db9f | 1347 | sect_attrs->nsections = 0; |
1da177e4 LT |
1348 | sattr = §_attrs->attrs[0]; |
1349 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1350 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1351 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1352 | if (sect_empty(sec)) | |
35dead42 | 1353 | continue; |
8f6d0378 RR |
1354 | sattr->address = sec->sh_addr; |
1355 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1356 | GFP_KERNEL); |
1357 | if (sattr->name == NULL) | |
1358 | goto out; | |
1359 | sect_attrs->nsections++; | |
361795b1 | 1360 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1361 | sattr->mattr.show = module_sect_show; |
1362 | sattr->mattr.store = NULL; | |
1363 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1364 | sattr->mattr.attr.mode = S_IRUGO; |
1365 | *(gattr++) = &(sattr++)->mattr.attr; | |
1366 | } | |
1367 | *gattr = NULL; | |
1368 | ||
1369 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1370 | goto out; | |
1371 | ||
1372 | mod->sect_attrs = sect_attrs; | |
1373 | return; | |
1374 | out: | |
04b1db9f | 1375 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1376 | } |
1377 | ||
1378 | static void remove_sect_attrs(struct module *mod) | |
1379 | { | |
1380 | if (mod->sect_attrs) { | |
1381 | sysfs_remove_group(&mod->mkobj.kobj, | |
1382 | &mod->sect_attrs->grp); | |
1383 | /* We are positive that no one is using any sect attrs | |
1384 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1385 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1386 | mod->sect_attrs = NULL; |
1387 | } | |
1388 | } | |
1389 | ||
6d760133 RM |
1390 | /* |
1391 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1392 | */ | |
1393 | ||
1394 | struct module_notes_attrs { | |
1395 | struct kobject *dir; | |
1396 | unsigned int notes; | |
1397 | struct bin_attribute attrs[0]; | |
1398 | }; | |
1399 | ||
2c3c8bea | 1400 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1401 | struct bin_attribute *bin_attr, |
1402 | char *buf, loff_t pos, size_t count) | |
1403 | { | |
1404 | /* | |
1405 | * The caller checked the pos and count against our size. | |
1406 | */ | |
1407 | memcpy(buf, bin_attr->private + pos, count); | |
1408 | return count; | |
1409 | } | |
1410 | ||
1411 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1412 | unsigned int i) | |
1413 | { | |
1414 | if (notes_attrs->dir) { | |
1415 | while (i-- > 0) | |
1416 | sysfs_remove_bin_file(notes_attrs->dir, | |
1417 | ¬es_attrs->attrs[i]); | |
e9432093 | 1418 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1419 | } |
1420 | kfree(notes_attrs); | |
1421 | } | |
1422 | ||
8f6d0378 | 1423 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1424 | { |
1425 | unsigned int notes, loaded, i; | |
1426 | struct module_notes_attrs *notes_attrs; | |
1427 | struct bin_attribute *nattr; | |
1428 | ||
ea6bff36 IM |
1429 | /* failed to create section attributes, so can't create notes */ |
1430 | if (!mod->sect_attrs) | |
1431 | return; | |
1432 | ||
6d760133 RM |
1433 | /* Count notes sections and allocate structures. */ |
1434 | notes = 0; | |
8f6d0378 RR |
1435 | for (i = 0; i < info->hdr->e_shnum; i++) |
1436 | if (!sect_empty(&info->sechdrs[i]) && | |
1437 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1438 | ++notes; |
1439 | ||
1440 | if (notes == 0) | |
1441 | return; | |
1442 | ||
1443 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1444 | + notes * sizeof(notes_attrs->attrs[0]), | |
1445 | GFP_KERNEL); | |
1446 | if (notes_attrs == NULL) | |
1447 | return; | |
1448 | ||
1449 | notes_attrs->notes = notes; | |
1450 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1451 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1452 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1453 | continue; |
8f6d0378 | 1454 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1455 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1456 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1457 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1458 | nattr->size = info->sechdrs[i].sh_size; |
1459 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1460 | nattr->read = module_notes_read; |
1461 | ++nattr; | |
1462 | } | |
1463 | ++loaded; | |
1464 | } | |
1465 | ||
4ff6abff | 1466 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1467 | if (!notes_attrs->dir) |
1468 | goto out; | |
1469 | ||
1470 | for (i = 0; i < notes; ++i) | |
1471 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1472 | ¬es_attrs->attrs[i])) | |
1473 | goto out; | |
1474 | ||
1475 | mod->notes_attrs = notes_attrs; | |
1476 | return; | |
1477 | ||
1478 | out: | |
1479 | free_notes_attrs(notes_attrs, i); | |
1480 | } | |
1481 | ||
1482 | static void remove_notes_attrs(struct module *mod) | |
1483 | { | |
1484 | if (mod->notes_attrs) | |
1485 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1486 | } | |
1487 | ||
1da177e4 | 1488 | #else |
04b1db9f | 1489 | |
8f6d0378 RR |
1490 | static inline void add_sect_attrs(struct module *mod, |
1491 | const struct load_info *info) | |
1da177e4 LT |
1492 | { |
1493 | } | |
1494 | ||
1495 | static inline void remove_sect_attrs(struct module *mod) | |
1496 | { | |
1497 | } | |
6d760133 | 1498 | |
8f6d0378 RR |
1499 | static inline void add_notes_attrs(struct module *mod, |
1500 | const struct load_info *info) | |
6d760133 RM |
1501 | { |
1502 | } | |
1503 | ||
1504 | static inline void remove_notes_attrs(struct module *mod) | |
1505 | { | |
1506 | } | |
8f6d0378 | 1507 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1508 | |
80a3d1bb RR |
1509 | static void add_usage_links(struct module *mod) |
1510 | { | |
1511 | #ifdef CONFIG_MODULE_UNLOAD | |
1512 | struct module_use *use; | |
1513 | int nowarn; | |
1514 | ||
75676500 | 1515 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1516 | list_for_each_entry(use, &mod->target_list, target_list) { |
1517 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1518 | &mod->mkobj.kobj, mod->name); | |
1519 | } | |
75676500 | 1520 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1521 | #endif |
1522 | } | |
1523 | ||
1524 | static void del_usage_links(struct module *mod) | |
1525 | { | |
1526 | #ifdef CONFIG_MODULE_UNLOAD | |
1527 | struct module_use *use; | |
1528 | ||
75676500 | 1529 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1530 | list_for_each_entry(use, &mod->target_list, target_list) |
1531 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1532 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1533 | #endif |
1534 | } | |
1535 | ||
6407ebb2 | 1536 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1537 | { |
1538 | struct module_attribute *attr; | |
03e88ae1 | 1539 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1540 | int error = 0; |
1541 | int i; | |
1542 | ||
03e88ae1 GKH |
1543 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1544 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1545 | GFP_KERNEL); | |
1546 | if (!mod->modinfo_attrs) | |
1547 | return -ENOMEM; | |
1548 | ||
1549 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1550 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1551 | if (!attr->test || | |
03e88ae1 GKH |
1552 | (attr->test && attr->test(mod))) { |
1553 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1554 | sysfs_attr_init(&temp_attr->attr); |
03e88ae1 GKH |
1555 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1556 | ++temp_attr; | |
1557 | } | |
c988d2b2 MD |
1558 | } |
1559 | return error; | |
1560 | } | |
1561 | ||
6407ebb2 | 1562 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1563 | { |
1564 | struct module_attribute *attr; | |
1565 | int i; | |
1566 | ||
03e88ae1 GKH |
1567 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1568 | /* pick a field to test for end of list */ | |
1569 | if (!attr->attr.name) | |
1570 | break; | |
c988d2b2 | 1571 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1572 | if (attr->free) |
1573 | attr->free(mod); | |
c988d2b2 | 1574 | } |
03e88ae1 | 1575 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1576 | } |
1da177e4 | 1577 | |
942e4431 LZ |
1578 | static void mod_kobject_put(struct module *mod) |
1579 | { | |
1580 | DECLARE_COMPLETION_ONSTACK(c); | |
1581 | mod->mkobj.kobj_completion = &c; | |
1582 | kobject_put(&mod->mkobj.kobj); | |
1583 | wait_for_completion(&c); | |
1584 | } | |
1585 | ||
6407ebb2 | 1586 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1587 | { |
1588 | int err; | |
6494a93d | 1589 | struct kobject *kobj; |
1da177e4 | 1590 | |
823bccfc | 1591 | if (!module_sysfs_initialized) { |
bddb12b3 | 1592 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1593 | err = -EINVAL; |
1594 | goto out; | |
1595 | } | |
6494a93d GKH |
1596 | |
1597 | kobj = kset_find_obj(module_kset, mod->name); | |
1598 | if (kobj) { | |
bddb12b3 | 1599 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1600 | kobject_put(kobj); |
1601 | err = -EINVAL; | |
1602 | goto out; | |
1603 | } | |
1604 | ||
1da177e4 | 1605 | mod->mkobj.mod = mod; |
e17e0f51 | 1606 | |
ac3c8141 GKH |
1607 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1608 | mod->mkobj.kobj.kset = module_kset; | |
1609 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1610 | "%s", mod->name); | |
1611 | if (err) | |
942e4431 | 1612 | mod_kobject_put(mod); |
270a6c4c | 1613 | |
97c146ef | 1614 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1615 | out: |
1616 | return err; | |
1617 | } | |
1618 | ||
6407ebb2 | 1619 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1620 | const struct load_info *info, |
270a6c4c KS |
1621 | struct kernel_param *kparam, |
1622 | unsigned int num_params) | |
1623 | { | |
1624 | int err; | |
1625 | ||
80a3d1bb RR |
1626 | err = mod_sysfs_init(mod); |
1627 | if (err) | |
1628 | goto out; | |
1629 | ||
4ff6abff | 1630 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1631 | if (!mod->holders_dir) { |
1632 | err = -ENOMEM; | |
270a6c4c | 1633 | goto out_unreg; |
240936e1 | 1634 | } |
270a6c4c | 1635 | |
1da177e4 LT |
1636 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1637 | if (err) | |
270a6c4c | 1638 | goto out_unreg_holders; |
1da177e4 | 1639 | |
c988d2b2 MD |
1640 | err = module_add_modinfo_attrs(mod); |
1641 | if (err) | |
e17e0f51 | 1642 | goto out_unreg_param; |
c988d2b2 | 1643 | |
80a3d1bb | 1644 | add_usage_links(mod); |
8f6d0378 RR |
1645 | add_sect_attrs(mod, info); |
1646 | add_notes_attrs(mod, info); | |
80a3d1bb | 1647 | |
e17e0f51 | 1648 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1649 | return 0; |
1650 | ||
e17e0f51 KS |
1651 | out_unreg_param: |
1652 | module_param_sysfs_remove(mod); | |
270a6c4c | 1653 | out_unreg_holders: |
78a2d906 | 1654 | kobject_put(mod->holders_dir); |
270a6c4c | 1655 | out_unreg: |
942e4431 | 1656 | mod_kobject_put(mod); |
80a3d1bb | 1657 | out: |
1da177e4 LT |
1658 | return err; |
1659 | } | |
34e4e2fe DL |
1660 | |
1661 | static void mod_sysfs_fini(struct module *mod) | |
1662 | { | |
8f6d0378 RR |
1663 | remove_notes_attrs(mod); |
1664 | remove_sect_attrs(mod); | |
942e4431 | 1665 | mod_kobject_put(mod); |
34e4e2fe DL |
1666 | } |
1667 | ||
8f6d0378 | 1668 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1669 | |
8f6d0378 RR |
1670 | static int mod_sysfs_setup(struct module *mod, |
1671 | const struct load_info *info, | |
6407ebb2 RR |
1672 | struct kernel_param *kparam, |
1673 | unsigned int num_params) | |
1674 | { | |
1675 | return 0; | |
1676 | } | |
1677 | ||
34e4e2fe DL |
1678 | static void mod_sysfs_fini(struct module *mod) |
1679 | { | |
1680 | } | |
1681 | ||
36b0360d RR |
1682 | static void module_remove_modinfo_attrs(struct module *mod) |
1683 | { | |
1684 | } | |
1685 | ||
80a3d1bb RR |
1686 | static void del_usage_links(struct module *mod) |
1687 | { | |
1688 | } | |
1689 | ||
34e4e2fe | 1690 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1691 | |
36b0360d | 1692 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1693 | { |
80a3d1bb | 1694 | del_usage_links(mod); |
c988d2b2 | 1695 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1696 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1697 | kobject_put(mod->mkobj.drivers_dir); |
1698 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1699 | mod_sysfs_fini(mod); |
1da177e4 LT |
1700 | } |
1701 | ||
1702 | /* | |
1703 | * unlink the module with the whole machine is stopped with interrupts off | |
1704 | * - this defends against kallsyms not taking locks | |
1705 | */ | |
1706 | static int __unlink_module(void *_mod) | |
1707 | { | |
1708 | struct module *mod = _mod; | |
1709 | list_del(&mod->list); | |
5336377d | 1710 | module_bug_cleanup(mod); |
1da177e4 LT |
1711 | return 0; |
1712 | } | |
1713 | ||
84e1c6bb | 1714 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1715 | /* | |
1716 | * LKM RO/NX protection: protect module's text/ro-data | |
1717 | * from modification and any data from execution. | |
1718 | */ | |
1719 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) | |
1720 | { | |
1721 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); | |
1722 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); | |
1723 | ||
1724 | if (end_pfn > begin_pfn) | |
1725 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1726 | } | |
1727 | ||
1728 | static void set_section_ro_nx(void *base, | |
1729 | unsigned long text_size, | |
1730 | unsigned long ro_size, | |
1731 | unsigned long total_size) | |
1732 | { | |
1733 | /* begin and end PFNs of the current subsection */ | |
1734 | unsigned long begin_pfn; | |
1735 | unsigned long end_pfn; | |
1736 | ||
1737 | /* | |
1738 | * Set RO for module text and RO-data: | |
1739 | * - Always protect first page. | |
1740 | * - Do not protect last partial page. | |
1741 | */ | |
1742 | if (ro_size > 0) | |
1743 | set_page_attributes(base, base + ro_size, set_memory_ro); | |
1744 | ||
1745 | /* | |
1746 | * Set NX permissions for module data: | |
1747 | * - Do not protect first partial page. | |
1748 | * - Always protect last page. | |
1749 | */ | |
1750 | if (total_size > text_size) { | |
1751 | begin_pfn = PFN_UP((unsigned long)base + text_size); | |
1752 | end_pfn = PFN_UP((unsigned long)base + total_size); | |
1753 | if (end_pfn > begin_pfn) | |
1754 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1755 | } | |
1756 | } | |
1757 | ||
01526ed0 JG |
1758 | static void unset_module_core_ro_nx(struct module *mod) |
1759 | { | |
1760 | set_page_attributes(mod->module_core + mod->core_text_size, | |
1761 | mod->module_core + mod->core_size, | |
1762 | set_memory_x); | |
1763 | set_page_attributes(mod->module_core, | |
1764 | mod->module_core + mod->core_ro_size, | |
1765 | set_memory_rw); | |
1766 | } | |
1767 | ||
1768 | static void unset_module_init_ro_nx(struct module *mod) | |
1769 | { | |
1770 | set_page_attributes(mod->module_init + mod->init_text_size, | |
1771 | mod->module_init + mod->init_size, | |
1772 | set_memory_x); | |
1773 | set_page_attributes(mod->module_init, | |
1774 | mod->module_init + mod->init_ro_size, | |
1775 | set_memory_rw); | |
84e1c6bb | 1776 | } |
1777 | ||
1778 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1779 | void set_all_modules_text_rw(void) |
84e1c6bb | 1780 | { |
1781 | struct module *mod; | |
1782 | ||
1783 | mutex_lock(&module_mutex); | |
1784 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1785 | if (mod->state == MODULE_STATE_UNFORMED) |
1786 | continue; | |
84e1c6bb | 1787 | if ((mod->module_core) && (mod->core_text_size)) { |
1788 | set_page_attributes(mod->module_core, | |
1789 | mod->module_core + mod->core_text_size, | |
1790 | set_memory_rw); | |
1791 | } | |
1792 | if ((mod->module_init) && (mod->init_text_size)) { | |
1793 | set_page_attributes(mod->module_init, | |
1794 | mod->module_init + mod->init_text_size, | |
1795 | set_memory_rw); | |
1796 | } | |
1797 | } | |
1798 | mutex_unlock(&module_mutex); | |
1799 | } | |
1800 | ||
1801 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1802 | void set_all_modules_text_ro(void) |
84e1c6bb | 1803 | { |
1804 | struct module *mod; | |
1805 | ||
1806 | mutex_lock(&module_mutex); | |
1807 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1808 | if (mod->state == MODULE_STATE_UNFORMED) |
1809 | continue; | |
84e1c6bb | 1810 | if ((mod->module_core) && (mod->core_text_size)) { |
1811 | set_page_attributes(mod->module_core, | |
1812 | mod->module_core + mod->core_text_size, | |
1813 | set_memory_ro); | |
1814 | } | |
1815 | if ((mod->module_init) && (mod->init_text_size)) { | |
1816 | set_page_attributes(mod->module_init, | |
1817 | mod->module_init + mod->init_text_size, | |
1818 | set_memory_ro); | |
1819 | } | |
1820 | } | |
1821 | mutex_unlock(&module_mutex); | |
1822 | } | |
1823 | #else | |
1824 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } | |
01526ed0 JG |
1825 | static void unset_module_core_ro_nx(struct module *mod) { } |
1826 | static void unset_module_init_ro_nx(struct module *mod) { } | |
84e1c6bb | 1827 | #endif |
1828 | ||
74e08fcf JB |
1829 | void __weak module_free(struct module *mod, void *module_region) |
1830 | { | |
1831 | vfree(module_region); | |
1832 | } | |
1833 | ||
1834 | void __weak module_arch_cleanup(struct module *mod) | |
1835 | { | |
1836 | } | |
1837 | ||
75676500 | 1838 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1839 | static void free_module(struct module *mod) |
1840 | { | |
7ead8b83 LZ |
1841 | trace_module_free(mod); |
1842 | ||
36b0360d | 1843 | mod_sysfs_teardown(mod); |
1da177e4 | 1844 | |
944a1fa0 RR |
1845 | /* We leave it in list to prevent duplicate loads, but make sure |
1846 | * that noone uses it while it's being deconstructed. */ | |
1847 | mod->state = MODULE_STATE_UNFORMED; | |
1848 | ||
b82bab4b JB |
1849 | /* Remove dynamic debug info */ |
1850 | ddebug_remove_module(mod->name); | |
1851 | ||
1da177e4 LT |
1852 | /* Arch-specific cleanup. */ |
1853 | module_arch_cleanup(mod); | |
1854 | ||
1855 | /* Module unload stuff */ | |
1856 | module_unload_free(mod); | |
1857 | ||
e180a6b7 RR |
1858 | /* Free any allocated parameters. */ |
1859 | destroy_params(mod->kp, mod->num_kp); | |
1860 | ||
944a1fa0 RR |
1861 | /* Now we can delete it from the lists */ |
1862 | mutex_lock(&module_mutex); | |
1863 | stop_machine(__unlink_module, mod, NULL); | |
1864 | mutex_unlock(&module_mutex); | |
1865 | ||
1da177e4 | 1866 | /* This may be NULL, but that's OK */ |
01526ed0 | 1867 | unset_module_init_ro_nx(mod); |
1da177e4 LT |
1868 | module_free(mod, mod->module_init); |
1869 | kfree(mod->args); | |
259354de | 1870 | percpu_modfree(mod); |
9f85a4bb | 1871 | |
fbb9ce95 IM |
1872 | /* Free lock-classes: */ |
1873 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1874 | ||
1da177e4 | 1875 | /* Finally, free the core (containing the module structure) */ |
01526ed0 | 1876 | unset_module_core_ro_nx(mod); |
1da177e4 | 1877 | module_free(mod, mod->module_core); |
eb8cdec4 BS |
1878 | |
1879 | #ifdef CONFIG_MPU | |
1880 | update_protections(current->mm); | |
1881 | #endif | |
1da177e4 LT |
1882 | } |
1883 | ||
1884 | void *__symbol_get(const char *symbol) | |
1885 | { | |
1886 | struct module *owner; | |
414fd31b | 1887 | const struct kernel_symbol *sym; |
1da177e4 | 1888 | |
24da1cbf | 1889 | preempt_disable(); |
414fd31b TA |
1890 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1891 | if (sym && strong_try_module_get(owner)) | |
1892 | sym = NULL; | |
24da1cbf | 1893 | preempt_enable(); |
1da177e4 | 1894 | |
414fd31b | 1895 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1896 | } |
1897 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1898 | ||
eea8b54d AN |
1899 | /* |
1900 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1901 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1902 | * |
1903 | * You must hold the module_mutex. | |
eea8b54d AN |
1904 | */ |
1905 | static int verify_export_symbols(struct module *mod) | |
1906 | { | |
b211104d | 1907 | unsigned int i; |
eea8b54d | 1908 | struct module *owner; |
b211104d RR |
1909 | const struct kernel_symbol *s; |
1910 | struct { | |
1911 | const struct kernel_symbol *sym; | |
1912 | unsigned int num; | |
1913 | } arr[] = { | |
1914 | { mod->syms, mod->num_syms }, | |
1915 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1916 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1917 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1918 | { mod->unused_syms, mod->num_unused_syms }, |
1919 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1920 | #endif |
b211104d | 1921 | }; |
eea8b54d | 1922 | |
b211104d RR |
1923 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1924 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 1925 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 1926 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
1927 | " (owned by %s)\n", |
1928 | mod->name, s->name, module_name(owner)); | |
1929 | return -ENOEXEC; | |
1930 | } | |
eea8b54d | 1931 | } |
b211104d RR |
1932 | } |
1933 | return 0; | |
eea8b54d AN |
1934 | } |
1935 | ||
9a4b9708 | 1936 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
1937 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
1938 | { | |
1939 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
1940 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 1941 | unsigned long secbase; |
49668688 | 1942 | unsigned int i; |
1da177e4 | 1943 | int ret = 0; |
414fd31b | 1944 | const struct kernel_symbol *ksym; |
1da177e4 | 1945 | |
49668688 RR |
1946 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
1947 | const char *name = info->strtab + sym[i].st_name; | |
1948 | ||
1da177e4 LT |
1949 | switch (sym[i].st_shndx) { |
1950 | case SHN_COMMON: | |
80375980 JM |
1951 | /* Ignore common symbols */ |
1952 | if (!strncmp(name, "__gnu_lto", 9)) | |
1953 | break; | |
1954 | ||
1da177e4 LT |
1955 | /* We compiled with -fno-common. These are not |
1956 | supposed to happen. */ | |
5e124169 | 1957 | pr_debug("Common symbol: %s\n", name); |
1da177e4 LT |
1958 | printk("%s: please compile with -fno-common\n", |
1959 | mod->name); | |
1960 | ret = -ENOEXEC; | |
1961 | break; | |
1962 | ||
1963 | case SHN_ABS: | |
1964 | /* Don't need to do anything */ | |
5e124169 | 1965 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
1966 | (long)sym[i].st_value); |
1967 | break; | |
1968 | ||
1969 | case SHN_UNDEF: | |
49668688 | 1970 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 1971 | /* Ok if resolved. */ |
9bea7f23 | 1972 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 1973 | sym[i].st_value = ksym->value; |
1da177e4 | 1974 | break; |
414fd31b TA |
1975 | } |
1976 | ||
1da177e4 | 1977 | /* Ok if weak. */ |
9bea7f23 | 1978 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
1979 | break; |
1980 | ||
bddb12b3 AM |
1981 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
1982 | mod->name, name, PTR_ERR(ksym)); | |
9bea7f23 | 1983 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
1984 | break; |
1985 | ||
1986 | default: | |
1987 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 1988 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 1989 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 1990 | else |
49668688 | 1991 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
1992 | sym[i].st_value += secbase; |
1993 | break; | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | return ret; | |
1998 | } | |
1999 | ||
49668688 | 2000 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2001 | { |
2002 | unsigned int i; | |
2003 | int err = 0; | |
2004 | ||
2005 | /* Now do relocations. */ | |
49668688 RR |
2006 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2007 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2008 | |
2009 | /* Not a valid relocation section? */ | |
49668688 | 2010 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2011 | continue; |
2012 | ||
2013 | /* Don't bother with non-allocated sections */ | |
49668688 | 2014 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2015 | continue; |
2016 | ||
49668688 RR |
2017 | if (info->sechdrs[i].sh_type == SHT_REL) |
2018 | err = apply_relocate(info->sechdrs, info->strtab, | |
2019 | info->index.sym, i, mod); | |
2020 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2021 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2022 | info->index.sym, i, mod); | |
22e268eb RR |
2023 | if (err < 0) |
2024 | break; | |
2025 | } | |
2026 | return err; | |
2027 | } | |
2028 | ||
088af9a6 HD |
2029 | /* Additional bytes needed by arch in front of individual sections */ |
2030 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2031 | unsigned int section) | |
2032 | { | |
2033 | /* default implementation just returns zero */ | |
2034 | return 0; | |
2035 | } | |
2036 | ||
1da177e4 | 2037 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2038 | static long get_offset(struct module *mod, unsigned int *size, |
2039 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2040 | { |
2041 | long ret; | |
2042 | ||
088af9a6 | 2043 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2044 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2045 | *size = ret + sechdr->sh_size; | |
2046 | return ret; | |
2047 | } | |
2048 | ||
2049 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2050 | might -- code, read-only data, read-write data, small data. Tally | |
2051 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2052 | belongs in init. */ | |
49668688 | 2053 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2054 | { |
2055 | static unsigned long const masks[][2] = { | |
2056 | /* NOTE: all executable code must be the first section | |
2057 | * in this array; otherwise modify the text_size | |
2058 | * finder in the two loops below */ | |
2059 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2060 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
2061 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2062 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2063 | }; | |
2064 | unsigned int m, i; | |
2065 | ||
49668688 RR |
2066 | for (i = 0; i < info->hdr->e_shnum; i++) |
2067 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2068 | |
5e124169 | 2069 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2070 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2071 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2072 | Elf_Shdr *s = &info->sechdrs[i]; | |
2073 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2074 | |
2075 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2076 | || (s->sh_flags & masks[m][1]) | |
2077 | || s->sh_entsize != ~0UL | |
49668688 | 2078 | || strstarts(sname, ".init")) |
1da177e4 | 2079 | continue; |
088af9a6 | 2080 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
5e124169 | 2081 | pr_debug("\t%s\n", sname); |
1da177e4 | 2082 | } |
84e1c6bb | 2083 | switch (m) { |
2084 | case 0: /* executable */ | |
2085 | mod->core_size = debug_align(mod->core_size); | |
1da177e4 | 2086 | mod->core_text_size = mod->core_size; |
84e1c6bb | 2087 | break; |
2088 | case 1: /* RO: text and ro-data */ | |
2089 | mod->core_size = debug_align(mod->core_size); | |
2090 | mod->core_ro_size = mod->core_size; | |
2091 | break; | |
2092 | case 3: /* whole core */ | |
2093 | mod->core_size = debug_align(mod->core_size); | |
2094 | break; | |
2095 | } | |
1da177e4 LT |
2096 | } |
2097 | ||
5e124169 | 2098 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2099 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2100 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2101 | Elf_Shdr *s = &info->sechdrs[i]; | |
2102 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2103 | |
2104 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2105 | || (s->sh_flags & masks[m][1]) | |
2106 | || s->sh_entsize != ~0UL | |
49668688 | 2107 | || !strstarts(sname, ".init")) |
1da177e4 | 2108 | continue; |
088af9a6 | 2109 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 | 2110 | | INIT_OFFSET_MASK); |
5e124169 | 2111 | pr_debug("\t%s\n", sname); |
1da177e4 | 2112 | } |
84e1c6bb | 2113 | switch (m) { |
2114 | case 0: /* executable */ | |
2115 | mod->init_size = debug_align(mod->init_size); | |
1da177e4 | 2116 | mod->init_text_size = mod->init_size; |
84e1c6bb | 2117 | break; |
2118 | case 1: /* RO: text and ro-data */ | |
2119 | mod->init_size = debug_align(mod->init_size); | |
2120 | mod->init_ro_size = mod->init_size; | |
2121 | break; | |
2122 | case 3: /* whole init */ | |
2123 | mod->init_size = debug_align(mod->init_size); | |
2124 | break; | |
2125 | } | |
1da177e4 LT |
2126 | } |
2127 | } | |
2128 | ||
1da177e4 LT |
2129 | static void set_license(struct module *mod, const char *license) |
2130 | { | |
2131 | if (!license) | |
2132 | license = "unspecified"; | |
2133 | ||
fa3ba2e8 | 2134 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2135 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2136 | pr_warn("%s: module license '%s' taints kernel.\n", |
2137 | mod->name, license); | |
373d4d09 RR |
2138 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2139 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2140 | } |
2141 | } | |
2142 | ||
2143 | /* Parse tag=value strings from .modinfo section */ | |
2144 | static char *next_string(char *string, unsigned long *secsize) | |
2145 | { | |
2146 | /* Skip non-zero chars */ | |
2147 | while (string[0]) { | |
2148 | string++; | |
2149 | if ((*secsize)-- <= 1) | |
2150 | return NULL; | |
2151 | } | |
2152 | ||
2153 | /* Skip any zero padding. */ | |
2154 | while (!string[0]) { | |
2155 | string++; | |
2156 | if ((*secsize)-- <= 1) | |
2157 | return NULL; | |
2158 | } | |
2159 | return string; | |
2160 | } | |
2161 | ||
49668688 | 2162 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2163 | { |
2164 | char *p; | |
2165 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2166 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2167 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2168 | |
49668688 | 2169 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2170 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2171 | return p + taglen + 1; | |
2172 | } | |
2173 | return NULL; | |
2174 | } | |
2175 | ||
49668688 | 2176 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2177 | { |
2178 | struct module_attribute *attr; | |
2179 | int i; | |
2180 | ||
2181 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2182 | if (attr->setup) | |
49668688 | 2183 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2184 | } |
2185 | } | |
c988d2b2 | 2186 | |
a263f776 RR |
2187 | static void free_modinfo(struct module *mod) |
2188 | { | |
2189 | struct module_attribute *attr; | |
2190 | int i; | |
2191 | ||
2192 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2193 | if (attr->free) | |
2194 | attr->free(mod); | |
2195 | } | |
2196 | } | |
2197 | ||
1da177e4 | 2198 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2199 | |
2200 | /* lookup symbol in given range of kernel_symbols */ | |
2201 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2202 | const struct kernel_symbol *start, | |
2203 | const struct kernel_symbol *stop) | |
2204 | { | |
9d63487f AIB |
2205 | return bsearch(name, start, stop - start, |
2206 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2207 | } |
2208 | ||
ca4787b7 TA |
2209 | static int is_exported(const char *name, unsigned long value, |
2210 | const struct module *mod) | |
1da177e4 | 2211 | { |
ca4787b7 TA |
2212 | const struct kernel_symbol *ks; |
2213 | if (!mod) | |
2214 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2215 | else |
ca4787b7 TA |
2216 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2217 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2218 | } |
2219 | ||
2220 | /* As per nm */ | |
eded41c1 | 2221 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2222 | { |
eded41c1 RR |
2223 | const Elf_Shdr *sechdrs = info->sechdrs; |
2224 | ||
1da177e4 LT |
2225 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2226 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2227 | return 'v'; | |
2228 | else | |
2229 | return 'w'; | |
2230 | } | |
2231 | if (sym->st_shndx == SHN_UNDEF) | |
2232 | return 'U'; | |
2233 | if (sym->st_shndx == SHN_ABS) | |
2234 | return 'a'; | |
2235 | if (sym->st_shndx >= SHN_LORESERVE) | |
2236 | return '?'; | |
2237 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2238 | return 't'; | |
2239 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2240 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2241 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2242 | return 'r'; | |
2243 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2244 | return 'g'; | |
2245 | else | |
2246 | return 'd'; | |
2247 | } | |
2248 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2249 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2250 | return 's'; | |
2251 | else | |
2252 | return 'b'; | |
2253 | } | |
eded41c1 RR |
2254 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2255 | ".debug")) { | |
1da177e4 | 2256 | return 'n'; |
eded41c1 | 2257 | } |
1da177e4 LT |
2258 | return '?'; |
2259 | } | |
2260 | ||
4a496226 JB |
2261 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
2262 | unsigned int shnum) | |
2263 | { | |
2264 | const Elf_Shdr *sec; | |
2265 | ||
2266 | if (src->st_shndx == SHN_UNDEF | |
2267 | || src->st_shndx >= shnum | |
2268 | || !src->st_name) | |
2269 | return false; | |
2270 | ||
2271 | sec = sechdrs + src->st_shndx; | |
2272 | if (!(sec->sh_flags & SHF_ALLOC) | |
2273 | #ifndef CONFIG_KALLSYMS_ALL | |
2274 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2275 | #endif | |
2276 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2277 | return false; | |
2278 | ||
2279 | return true; | |
2280 | } | |
2281 | ||
48fd1188 KC |
2282 | /* |
2283 | * We only allocate and copy the strings needed by the parts of symtab | |
2284 | * we keep. This is simple, but has the effect of making multiple | |
2285 | * copies of duplicates. We could be more sophisticated, see | |
2286 | * linux-kernel thread starting with | |
2287 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2288 | */ | |
49668688 | 2289 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2290 | { |
49668688 RR |
2291 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2292 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2293 | const Elf_Sym *src; |
54523ec7 | 2294 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2295 | |
2296 | /* Put symbol section at end of init part of module. */ | |
2297 | symsect->sh_flags |= SHF_ALLOC; | |
2298 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
49668688 | 2299 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2300 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2301 | |
49668688 | 2302 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2303 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2304 | |
48fd1188 | 2305 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 RR |
2306 | for (ndst = i = 0; i < nsrc; i++) { |
2307 | if (i == 0 || | |
2308 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2309 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; | |
48fd1188 | 2310 | ndst++; |
554bdfe5 | 2311 | } |
59ef28b1 | 2312 | } |
4a496226 JB |
2313 | |
2314 | /* Append room for core symbols at end of core part. */ | |
49668688 | 2315 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
48fd1188 KC |
2316 | info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
2317 | mod->core_size += strtab_size; | |
4a496226 | 2318 | |
554bdfe5 JB |
2319 | /* Put string table section at end of init part of module. */ |
2320 | strsect->sh_flags |= SHF_ALLOC; | |
2321 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
49668688 | 2322 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2323 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
4a496226 JB |
2324 | } |
2325 | ||
811d66a0 | 2326 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2327 | { |
4a496226 JB |
2328 | unsigned int i, ndst; |
2329 | const Elf_Sym *src; | |
2330 | Elf_Sym *dst; | |
554bdfe5 | 2331 | char *s; |
eded41c1 | 2332 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2333 | |
eded41c1 RR |
2334 | mod->symtab = (void *)symsec->sh_addr; |
2335 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae RR |
2336 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2337 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2338 | |
2339 | /* Set types up while we still have access to sections. */ | |
2340 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2341 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2342 | |
d913188c | 2343 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
48fd1188 | 2344 | mod->core_strtab = s = mod->module_core + info->stroffs; |
4a496226 | 2345 | src = mod->symtab; |
59ef28b1 RR |
2346 | for (ndst = i = 0; i < mod->num_symtab; i++) { |
2347 | if (i == 0 || | |
2348 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2349 | dst[ndst] = src[i]; | |
2350 | dst[ndst++].st_name = s - mod->core_strtab; | |
2351 | s += strlcpy(s, &mod->strtab[src[i].st_name], | |
2352 | KSYM_NAME_LEN) + 1; | |
2353 | } | |
4a496226 JB |
2354 | } |
2355 | mod->core_num_syms = ndst; | |
1da177e4 LT |
2356 | } |
2357 | #else | |
49668688 | 2358 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2359 | { |
2360 | } | |
3ae91c21 | 2361 | |
abbce906 | 2362 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2363 | { |
2364 | } | |
2365 | #endif /* CONFIG_KALLSYMS */ | |
2366 | ||
e9d376f0 | 2367 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2368 | { |
811d66a0 RR |
2369 | if (!debug) |
2370 | return; | |
e9d376f0 JB |
2371 | #ifdef CONFIG_DYNAMIC_DEBUG |
2372 | if (ddebug_add_module(debug, num, debug->modname)) | |
bddb12b3 AM |
2373 | pr_err("dynamic debug error adding module: %s\n", |
2374 | debug->modname); | |
e9d376f0 | 2375 | #endif |
5e458cc0 | 2376 | } |
346e15be | 2377 | |
ff49d74a YS |
2378 | static void dynamic_debug_remove(struct _ddebug *debug) |
2379 | { | |
2380 | if (debug) | |
2381 | ddebug_remove_module(debug->modname); | |
2382 | } | |
2383 | ||
74e08fcf JB |
2384 | void * __weak module_alloc(unsigned long size) |
2385 | { | |
82fab442 | 2386 | return vmalloc_exec(size); |
74e08fcf JB |
2387 | } |
2388 | ||
3a642e99 RR |
2389 | static void *module_alloc_update_bounds(unsigned long size) |
2390 | { | |
2391 | void *ret = module_alloc(size); | |
2392 | ||
2393 | if (ret) { | |
75676500 | 2394 | mutex_lock(&module_mutex); |
3a642e99 RR |
2395 | /* Update module bounds. */ |
2396 | if ((unsigned long)ret < module_addr_min) | |
2397 | module_addr_min = (unsigned long)ret; | |
2398 | if ((unsigned long)ret + size > module_addr_max) | |
2399 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2400 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2401 | } |
2402 | return ret; | |
2403 | } | |
2404 | ||
4f2294b6 | 2405 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2406 | static void kmemleak_load_module(const struct module *mod, |
2407 | const struct load_info *info) | |
4f2294b6 CM |
2408 | { |
2409 | unsigned int i; | |
2410 | ||
2411 | /* only scan the sections containing data */ | |
c017b4be | 2412 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2413 | |
49668688 | 2414 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2415 | /* Scan all writable sections that's not executable */ |
2416 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2417 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2418 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2419 | continue; |
2420 | ||
49668688 RR |
2421 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2422 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2423 | } |
2424 | } | |
2425 | #else | |
49668688 RR |
2426 | static inline void kmemleak_load_module(const struct module *mod, |
2427 | const struct load_info *info) | |
4f2294b6 CM |
2428 | { |
2429 | } | |
2430 | #endif | |
2431 | ||
106a4ee2 | 2432 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2433 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2434 | { |
2435 | int err = -ENOKEY; | |
34e1169d KC |
2436 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2437 | const void *mod = info->hdr; | |
caabe240 | 2438 | |
34e1169d KC |
2439 | if (info->len > markerlen && |
2440 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { | |
caabe240 | 2441 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2442 | info->len -= markerlen; |
2443 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2444 | } |
2445 | ||
2446 | if (!err) { | |
2447 | info->sig_ok = true; | |
2448 | return 0; | |
2449 | } | |
2450 | ||
2451 | /* Not having a signature is only an error if we're strict. */ | |
1d0059f3 DH |
2452 | if (err < 0 && fips_enabled) |
2453 | panic("Module verification failed with error %d in FIPS mode\n", | |
2454 | err); | |
106a4ee2 RR |
2455 | if (err == -ENOKEY && !sig_enforce) |
2456 | err = 0; | |
2457 | ||
2458 | return err; | |
2459 | } | |
2460 | #else /* !CONFIG_MODULE_SIG */ | |
34e1169d | 2461 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2462 | { |
2463 | return 0; | |
2464 | } | |
2465 | #endif /* !CONFIG_MODULE_SIG */ | |
2466 | ||
34e1169d KC |
2467 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2468 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2469 | { |
34e1169d KC |
2470 | if (info->len < sizeof(*(info->hdr))) |
2471 | return -ENOEXEC; | |
2472 | ||
2473 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2474 | || info->hdr->e_type != ET_REL | |
2475 | || !elf_check_arch(info->hdr) | |
2476 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2477 | return -ENOEXEC; | |
2478 | ||
2479 | if (info->hdr->e_shoff >= info->len | |
2480 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2481 | info->len - info->hdr->e_shoff)) | |
2482 | return -ENOEXEC; | |
40dd2560 | 2483 | |
34e1169d KC |
2484 | return 0; |
2485 | } | |
2486 | ||
2487 | /* Sets info->hdr and info->len. */ | |
2488 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2489 | struct load_info *info) | |
40dd2560 RR |
2490 | { |
2491 | int err; | |
40dd2560 | 2492 | |
34e1169d KC |
2493 | info->len = len; |
2494 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2495 | return -ENOEXEC; |
2496 | ||
2e72d51b KC |
2497 | err = security_kernel_module_from_file(NULL); |
2498 | if (err) | |
2499 | return err; | |
2500 | ||
40dd2560 | 2501 | /* Suck in entire file: we'll want most of it. */ |
34e1169d KC |
2502 | info->hdr = vmalloc(info->len); |
2503 | if (!info->hdr) | |
40dd2560 RR |
2504 | return -ENOMEM; |
2505 | ||
34e1169d KC |
2506 | if (copy_from_user(info->hdr, umod, info->len) != 0) { |
2507 | vfree(info->hdr); | |
2508 | return -EFAULT; | |
40dd2560 RR |
2509 | } |
2510 | ||
34e1169d KC |
2511 | return 0; |
2512 | } | |
2513 | ||
2514 | /* Sets info->hdr and info->len. */ | |
2515 | static int copy_module_from_fd(int fd, struct load_info *info) | |
2516 | { | |
a2e0578b | 2517 | struct fd f = fdget(fd); |
34e1169d KC |
2518 | int err; |
2519 | struct kstat stat; | |
2520 | loff_t pos; | |
2521 | ssize_t bytes = 0; | |
2522 | ||
a2e0578b | 2523 | if (!f.file) |
34e1169d KC |
2524 | return -ENOEXEC; |
2525 | ||
a2e0578b | 2526 | err = security_kernel_module_from_file(f.file); |
106a4ee2 | 2527 | if (err) |
2e72d51b | 2528 | goto out; |
106a4ee2 | 2529 | |
a2e0578b | 2530 | err = vfs_getattr(&f.file->f_path, &stat); |
106a4ee2 | 2531 | if (err) |
34e1169d | 2532 | goto out; |
40dd2560 | 2533 | |
34e1169d KC |
2534 | if (stat.size > INT_MAX) { |
2535 | err = -EFBIG; | |
2536 | goto out; | |
40dd2560 | 2537 | } |
52441fa8 SL |
2538 | |
2539 | /* Don't hand 0 to vmalloc, it whines. */ | |
2540 | if (stat.size == 0) { | |
2541 | err = -EINVAL; | |
2542 | goto out; | |
2543 | } | |
2544 | ||
34e1169d KC |
2545 | info->hdr = vmalloc(stat.size); |
2546 | if (!info->hdr) { | |
2547 | err = -ENOMEM; | |
2548 | goto out; | |
40dd2560 | 2549 | } |
d913188c | 2550 | |
34e1169d KC |
2551 | pos = 0; |
2552 | while (pos < stat.size) { | |
a2e0578b | 2553 | bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos, |
34e1169d KC |
2554 | stat.size - pos); |
2555 | if (bytes < 0) { | |
2556 | vfree(info->hdr); | |
2557 | err = bytes; | |
2558 | goto out; | |
2559 | } | |
2560 | if (bytes == 0) | |
2561 | break; | |
2562 | pos += bytes; | |
2563 | } | |
2564 | info->len = pos; | |
40dd2560 | 2565 | |
34e1169d | 2566 | out: |
a2e0578b | 2567 | fdput(f); |
40dd2560 RR |
2568 | return err; |
2569 | } | |
2570 | ||
d913188c RR |
2571 | static void free_copy(struct load_info *info) |
2572 | { | |
d913188c RR |
2573 | vfree(info->hdr); |
2574 | } | |
2575 | ||
2f3238ae | 2576 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2577 | { |
2578 | unsigned int i; | |
2579 | ||
2580 | /* This should always be true, but let's be sure. */ | |
2581 | info->sechdrs[0].sh_addr = 0; | |
2582 | ||
2583 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2584 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2585 | if (shdr->sh_type != SHT_NOBITS | |
2586 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2587 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2588 | return -ENOEXEC; |
2589 | } | |
2590 | ||
2591 | /* Mark all sections sh_addr with their address in the | |
2592 | temporary image. */ | |
2593 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2594 | ||
2595 | #ifndef CONFIG_MODULE_UNLOAD | |
2596 | /* Don't load .exit sections */ | |
2597 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2598 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2599 | #endif | |
8b5f61a7 | 2600 | } |
d6df72a0 RR |
2601 | |
2602 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2603 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2604 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2605 | else | |
2606 | info->index.vers = find_sec(info, "__versions"); | |
49668688 | 2607 | info->index.info = find_sec(info, ".modinfo"); |
d6df72a0 RR |
2608 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2609 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2610 | return 0; |
2611 | } | |
2612 | ||
3264d3f9 LT |
2613 | /* |
2614 | * Set up our basic convenience variables (pointers to section headers, | |
2615 | * search for module section index etc), and do some basic section | |
2616 | * verification. | |
2617 | * | |
2618 | * Return the temporary module pointer (we'll replace it with the final | |
2619 | * one when we move the module sections around). | |
2620 | */ | |
2f3238ae | 2621 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2622 | { |
2623 | unsigned int i; | |
8b5f61a7 | 2624 | int err; |
3264d3f9 LT |
2625 | struct module *mod; |
2626 | ||
2627 | /* Set up the convenience variables */ | |
2628 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2629 | info->secstrings = (void *)info->hdr |
2630 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2631 | |
2f3238ae | 2632 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2633 | if (err) |
2634 | return ERR_PTR(err); | |
3264d3f9 | 2635 | |
8b5f61a7 RR |
2636 | /* Find internal symbols and strings. */ |
2637 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2638 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2639 | info->index.sym = i; | |
2640 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2641 | info->strtab = (char *)info->hdr |
2642 | + info->sechdrs[info->index.str].sh_offset; | |
2643 | break; | |
3264d3f9 | 2644 | } |
3264d3f9 LT |
2645 | } |
2646 | ||
49668688 | 2647 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2648 | if (!info->index.mod) { |
bddb12b3 | 2649 | pr_warn("No module found in object\n"); |
3264d3f9 LT |
2650 | return ERR_PTR(-ENOEXEC); |
2651 | } | |
2652 | /* This is temporary: point mod into copy of data. */ | |
2653 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2654 | ||
2655 | if (info->index.sym == 0) { | |
bddb12b3 | 2656 | pr_warn("%s: module has no symbols (stripped?)\n", mod->name); |
3264d3f9 LT |
2657 | return ERR_PTR(-ENOEXEC); |
2658 | } | |
2659 | ||
49668688 | 2660 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2661 | |
3264d3f9 LT |
2662 | /* Check module struct version now, before we try to use module. */ |
2663 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2664 | return ERR_PTR(-ENOEXEC); | |
2665 | ||
2666 | return mod; | |
3264d3f9 LT |
2667 | } |
2668 | ||
2f3238ae | 2669 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2670 | { |
49668688 | 2671 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2672 | int err; |
2673 | ||
2f3238ae RR |
2674 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2675 | modmagic = NULL; | |
2676 | ||
40dd2560 RR |
2677 | /* This is allowed: modprobe --force will invalidate it. */ |
2678 | if (!modmagic) { | |
2679 | err = try_to_force_load(mod, "bad vermagic"); | |
2680 | if (err) | |
2681 | return err; | |
49668688 | 2682 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 2683 | pr_err("%s: version magic '%s' should be '%s'\n", |
40dd2560 RR |
2684 | mod->name, modmagic, vermagic); |
2685 | return -ENOEXEC; | |
2686 | } | |
2687 | ||
2449b8ba | 2688 | if (!get_modinfo(info, "intree")) |
373d4d09 | 2689 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
2449b8ba | 2690 | |
49668688 | 2691 | if (get_modinfo(info, "staging")) { |
373d4d09 | 2692 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
2693 | pr_warn("%s: module is from the staging directory, the quality " |
2694 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 2695 | } |
22e268eb RR |
2696 | |
2697 | /* Set up license info based on the info section */ | |
49668688 | 2698 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2699 | |
40dd2560 RR |
2700 | return 0; |
2701 | } | |
2702 | ||
eb3057df | 2703 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2704 | { |
49668688 | 2705 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2706 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2707 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2708 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2709 | mod->crcs = section_addr(info, "__kcrctab"); |
2710 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2711 | sizeof(*mod->gpl_syms), |
2712 | &mod->num_gpl_syms); | |
49668688 RR |
2713 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2714 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2715 | "__ksymtab_gpl_future", |
2716 | sizeof(*mod->gpl_future_syms), | |
2717 | &mod->num_gpl_future_syms); | |
49668688 | 2718 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2719 | |
2720 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2721 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2722 | sizeof(*mod->unused_syms), |
2723 | &mod->num_unused_syms); | |
49668688 RR |
2724 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2725 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2726 | sizeof(*mod->unused_gpl_syms), |
2727 | &mod->num_unused_gpl_syms); | |
49668688 | 2728 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2729 | #endif |
2730 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2731 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 2732 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
2733 | if (!mod->ctors) |
2734 | mod->ctors = section_objs(info, ".init_array", | |
2735 | sizeof(*mod->ctors), &mod->num_ctors); | |
2736 | else if (find_sec(info, ".init_array")) { | |
2737 | /* | |
2738 | * This shouldn't happen with same compiler and binutils | |
2739 | * building all parts of the module. | |
2740 | */ | |
2741 | printk(KERN_WARNING "%s: has both .ctors and .init_array.\n", | |
2742 | mod->name); | |
2743 | return -EINVAL; | |
2744 | } | |
f91a13bb LT |
2745 | #endif |
2746 | ||
2747 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2748 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2749 | sizeof(*mod->tracepoints_ptrs), | |
2750 | &mod->num_tracepoints); | |
f91a13bb | 2751 | #endif |
bf5438fc JB |
2752 | #ifdef HAVE_JUMP_LABEL |
2753 | mod->jump_entries = section_objs(info, "__jump_table", | |
2754 | sizeof(*mod->jump_entries), | |
2755 | &mod->num_jump_entries); | |
2756 | #endif | |
f91a13bb | 2757 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2758 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2759 | sizeof(*mod->trace_events), |
2760 | &mod->num_trace_events); | |
f91a13bb | 2761 | #endif |
13b9b6e7 SR |
2762 | #ifdef CONFIG_TRACING |
2763 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2764 | sizeof(*mod->trace_bprintk_fmt_start), | |
2765 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 2766 | #endif |
f91a13bb LT |
2767 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2768 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2769 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2770 | sizeof(*mod->ftrace_callsites), |
2771 | &mod->num_ftrace_callsites); | |
2772 | #endif | |
22e268eb | 2773 | |
811d66a0 RR |
2774 | mod->extable = section_objs(info, "__ex_table", |
2775 | sizeof(*mod->extable), &mod->num_exentries); | |
2776 | ||
49668688 | 2777 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 2778 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
2779 | |
2780 | info->debug = section_objs(info, "__verbose", | |
2781 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
2782 | |
2783 | return 0; | |
f91a13bb LT |
2784 | } |
2785 | ||
49668688 | 2786 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2787 | { |
2788 | int i; | |
2789 | void *ptr; | |
2790 | ||
2791 | /* Do the allocs. */ | |
2792 | ptr = module_alloc_update_bounds(mod->core_size); | |
2793 | /* | |
2794 | * The pointer to this block is stored in the module structure | |
2795 | * which is inside the block. Just mark it as not being a | |
2796 | * leak. | |
2797 | */ | |
2798 | kmemleak_not_leak(ptr); | |
2799 | if (!ptr) | |
d913188c | 2800 | return -ENOMEM; |
65b8a9b4 LT |
2801 | |
2802 | memset(ptr, 0, mod->core_size); | |
2803 | mod->module_core = ptr; | |
2804 | ||
82fab442 RR |
2805 | if (mod->init_size) { |
2806 | ptr = module_alloc_update_bounds(mod->init_size); | |
2807 | /* | |
2808 | * The pointer to this block is stored in the module structure | |
2809 | * which is inside the block. This block doesn't need to be | |
2810 | * scanned as it contains data and code that will be freed | |
2811 | * after the module is initialized. | |
2812 | */ | |
2813 | kmemleak_ignore(ptr); | |
2814 | if (!ptr) { | |
2815 | module_free(mod, mod->module_core); | |
2816 | return -ENOMEM; | |
2817 | } | |
2818 | memset(ptr, 0, mod->init_size); | |
2819 | mod->module_init = ptr; | |
2820 | } else | |
2821 | mod->module_init = NULL; | |
65b8a9b4 LT |
2822 | |
2823 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 2824 | pr_debug("final section addresses:\n"); |
49668688 | 2825 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2826 | void *dest; |
49668688 | 2827 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2828 | |
49668688 | 2829 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2830 | continue; |
2831 | ||
49668688 | 2832 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
65b8a9b4 | 2833 | dest = mod->module_init |
49668688 | 2834 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 2835 | else |
49668688 | 2836 | dest = mod->module_core + shdr->sh_entsize; |
65b8a9b4 | 2837 | |
49668688 RR |
2838 | if (shdr->sh_type != SHT_NOBITS) |
2839 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 2840 | /* Update sh_addr to point to copy in image. */ |
49668688 | 2841 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
2842 | pr_debug("\t0x%lx %s\n", |
2843 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 2844 | } |
d913188c RR |
2845 | |
2846 | return 0; | |
65b8a9b4 LT |
2847 | } |
2848 | ||
49668688 | 2849 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
2850 | { |
2851 | /* | |
2852 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2853 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2854 | * using GPL-only symbols it needs. | |
2855 | */ | |
2856 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 2857 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
2858 | |
2859 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2860 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
2861 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2862 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 2863 | |
c99af375 MG |
2864 | /* lve claims to be GPL but upstream won't provide source */ |
2865 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
2866 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2867 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 2868 | |
22e268eb RR |
2869 | #ifdef CONFIG_MODVERSIONS |
2870 | if ((mod->num_syms && !mod->crcs) | |
2871 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2872 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
2873 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2874 | || (mod->num_unused_syms && !mod->unused_crcs) | |
2875 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
2876 | #endif | |
2877 | ) { | |
2878 | return try_to_force_load(mod, | |
2879 | "no versions for exported symbols"); | |
2880 | } | |
2881 | #endif | |
2882 | return 0; | |
2883 | } | |
2884 | ||
2885 | static void flush_module_icache(const struct module *mod) | |
2886 | { | |
2887 | mm_segment_t old_fs; | |
2888 | ||
2889 | /* flush the icache in correct context */ | |
2890 | old_fs = get_fs(); | |
2891 | set_fs(KERNEL_DS); | |
2892 | ||
2893 | /* | |
2894 | * Flush the instruction cache, since we've played with text. | |
2895 | * Do it before processing of module parameters, so the module | |
2896 | * can provide parameter accessor functions of its own. | |
2897 | */ | |
2898 | if (mod->module_init) | |
2899 | flush_icache_range((unsigned long)mod->module_init, | |
2900 | (unsigned long)mod->module_init | |
2901 | + mod->init_size); | |
2902 | flush_icache_range((unsigned long)mod->module_core, | |
2903 | (unsigned long)mod->module_core + mod->core_size); | |
2904 | ||
2905 | set_fs(old_fs); | |
2906 | } | |
2907 | ||
74e08fcf JB |
2908 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
2909 | Elf_Shdr *sechdrs, | |
2910 | char *secstrings, | |
2911 | struct module *mod) | |
2912 | { | |
2913 | return 0; | |
2914 | } | |
2915 | ||
2f3238ae | 2916 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 2917 | { |
d913188c | 2918 | /* Module within temporary copy. */ |
1da177e4 | 2919 | struct module *mod; |
d913188c | 2920 | int err; |
3ae91c21 | 2921 | |
2f3238ae | 2922 | mod = setup_load_info(info, flags); |
d913188c RR |
2923 | if (IS_ERR(mod)) |
2924 | return mod; | |
1da177e4 | 2925 | |
2f3238ae | 2926 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
2927 | if (err) |
2928 | return ERR_PTR(err); | |
1da177e4 | 2929 | |
1da177e4 | 2930 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
2931 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
2932 | info->secstrings, mod); | |
1da177e4 | 2933 | if (err < 0) |
8d8022e8 | 2934 | return ERR_PTR(err); |
1da177e4 | 2935 | |
8d8022e8 RR |
2936 | /* We will do a special allocation for per-cpu sections later. */ |
2937 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 LT |
2938 | |
2939 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2940 | this is done generically; there doesn't appear to be any | |
2941 | special cases for the architectures. */ | |
49668688 | 2942 | layout_sections(mod, info); |
49668688 | 2943 | layout_symtab(mod, info); |
1da177e4 | 2944 | |
65b8a9b4 | 2945 | /* Allocate and move to the final place */ |
49668688 | 2946 | err = move_module(mod, info); |
d913188c | 2947 | if (err) |
8d8022e8 | 2948 | return ERR_PTR(err); |
d913188c RR |
2949 | |
2950 | /* Module has been copied to its final place now: return it. */ | |
2951 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 2952 | kmemleak_load_module(mod, info); |
d913188c | 2953 | return mod; |
d913188c RR |
2954 | } |
2955 | ||
2956 | /* mod is no longer valid after this! */ | |
2957 | static void module_deallocate(struct module *mod, struct load_info *info) | |
2958 | { | |
d913188c RR |
2959 | percpu_modfree(mod); |
2960 | module_free(mod, mod->module_init); | |
2961 | module_free(mod, mod->module_core); | |
2962 | } | |
2963 | ||
74e08fcf JB |
2964 | int __weak module_finalize(const Elf_Ehdr *hdr, |
2965 | const Elf_Shdr *sechdrs, | |
2966 | struct module *me) | |
2967 | { | |
2968 | return 0; | |
2969 | } | |
2970 | ||
811d66a0 RR |
2971 | static int post_relocation(struct module *mod, const struct load_info *info) |
2972 | { | |
51f3d0f4 | 2973 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
2974 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
2975 | ||
2976 | /* Copy relocated percpu area over. */ | |
2977 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
2978 | info->sechdrs[info->index.pcpu].sh_size); | |
2979 | ||
51f3d0f4 | 2980 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
2981 | add_kallsyms(mod, info); |
2982 | ||
2983 | /* Arch-specific module finalizing. */ | |
2984 | return module_finalize(info->hdr, info->sechdrs, mod); | |
2985 | } | |
2986 | ||
9bb9c3be RR |
2987 | /* Is this module of this name done loading? No locks held. */ |
2988 | static bool finished_loading(const char *name) | |
2989 | { | |
2990 | struct module *mod; | |
2991 | bool ret; | |
2992 | ||
2993 | mutex_lock(&module_mutex); | |
4f6de4d5 | 2994 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
2995 | ret = !mod || mod->state == MODULE_STATE_LIVE |
2996 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
2997 | mutex_unlock(&module_mutex); |
2998 | ||
2999 | return ret; | |
3000 | } | |
3001 | ||
34e1169d KC |
3002 | /* Call module constructors. */ |
3003 | static void do_mod_ctors(struct module *mod) | |
3004 | { | |
3005 | #ifdef CONFIG_CONSTRUCTORS | |
3006 | unsigned long i; | |
3007 | ||
3008 | for (i = 0; i < mod->num_ctors; i++) | |
3009 | mod->ctors[i](); | |
3010 | #endif | |
3011 | } | |
3012 | ||
3013 | /* This is where the real work happens */ | |
3014 | static int do_init_module(struct module *mod) | |
3015 | { | |
3016 | int ret = 0; | |
3017 | ||
774a1221 TH |
3018 | /* |
3019 | * We want to find out whether @mod uses async during init. Clear | |
3020 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3021 | */ | |
3022 | current->flags &= ~PF_USED_ASYNC; | |
3023 | ||
34e1169d KC |
3024 | blocking_notifier_call_chain(&module_notify_list, |
3025 | MODULE_STATE_COMING, mod); | |
3026 | ||
3027 | /* Set RO and NX regions for core */ | |
3028 | set_section_ro_nx(mod->module_core, | |
3029 | mod->core_text_size, | |
3030 | mod->core_ro_size, | |
3031 | mod->core_size); | |
3032 | ||
3033 | /* Set RO and NX regions for init */ | |
3034 | set_section_ro_nx(mod->module_init, | |
3035 | mod->init_text_size, | |
3036 | mod->init_ro_size, | |
3037 | mod->init_size); | |
3038 | ||
3039 | do_mod_ctors(mod); | |
3040 | /* Start the module */ | |
3041 | if (mod->init != NULL) | |
3042 | ret = do_one_initcall(mod->init); | |
3043 | if (ret < 0) { | |
3044 | /* Init routine failed: abort. Try to protect us from | |
3045 | buggy refcounters. */ | |
3046 | mod->state = MODULE_STATE_GOING; | |
3047 | synchronize_sched(); | |
3048 | module_put(mod); | |
3049 | blocking_notifier_call_chain(&module_notify_list, | |
3050 | MODULE_STATE_GOING, mod); | |
3051 | free_module(mod); | |
3052 | wake_up_all(&module_wq); | |
3053 | return ret; | |
3054 | } | |
3055 | if (ret > 0) { | |
bddb12b3 AM |
3056 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3057 | "follow 0/-E convention\n" | |
3058 | "%s: loading module anyway...\n", | |
3059 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3060 | dump_stack(); |
3061 | } | |
3062 | ||
3063 | /* Now it's a first class citizen! */ | |
3064 | mod->state = MODULE_STATE_LIVE; | |
3065 | blocking_notifier_call_chain(&module_notify_list, | |
3066 | MODULE_STATE_LIVE, mod); | |
3067 | ||
774a1221 TH |
3068 | /* |
3069 | * We need to finish all async code before the module init sequence | |
3070 | * is done. This has potential to deadlock. For example, a newly | |
3071 | * detected block device can trigger request_module() of the | |
3072 | * default iosched from async probing task. Once userland helper | |
3073 | * reaches here, async_synchronize_full() will wait on the async | |
3074 | * task waiting on request_module() and deadlock. | |
3075 | * | |
3076 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3077 | * iff module init queued any async jobs. This isn't a full | |
3078 | * solution as it will deadlock the same if module loading from | |
3079 | * async jobs nests more than once; however, due to the various | |
3080 | * constraints, this hack seems to be the best option for now. | |
3081 | * Please refer to the following thread for details. | |
3082 | * | |
3083 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3084 | */ | |
3085 | if (current->flags & PF_USED_ASYNC) | |
3086 | async_synchronize_full(); | |
34e1169d KC |
3087 | |
3088 | mutex_lock(&module_mutex); | |
3089 | /* Drop initial reference. */ | |
3090 | module_put(mod); | |
3091 | trim_init_extable(mod); | |
3092 | #ifdef CONFIG_KALLSYMS | |
3093 | mod->num_symtab = mod->core_num_syms; | |
3094 | mod->symtab = mod->core_symtab; | |
3095 | mod->strtab = mod->core_strtab; | |
3096 | #endif | |
3097 | unset_module_init_ro_nx(mod); | |
3098 | module_free(mod, mod->module_init); | |
3099 | mod->module_init = NULL; | |
3100 | mod->init_size = 0; | |
3101 | mod->init_ro_size = 0; | |
3102 | mod->init_text_size = 0; | |
3103 | mutex_unlock(&module_mutex); | |
3104 | wake_up_all(&module_wq); | |
3105 | ||
3106 | return 0; | |
3107 | } | |
3108 | ||
3109 | static int may_init_module(void) | |
3110 | { | |
3111 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3112 | return -EPERM; | |
3113 | ||
3114 | return 0; | |
3115 | } | |
3116 | ||
a3535c7e RR |
3117 | /* |
3118 | * We try to place it in the list now to make sure it's unique before | |
3119 | * we dedicate too many resources. In particular, temporary percpu | |
3120 | * memory exhaustion. | |
3121 | */ | |
3122 | static int add_unformed_module(struct module *mod) | |
3123 | { | |
3124 | int err; | |
3125 | struct module *old; | |
3126 | ||
3127 | mod->state = MODULE_STATE_UNFORMED; | |
3128 | ||
3129 | again: | |
3130 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3131 | old = find_module_all(mod->name, strlen(mod->name), true); |
3132 | if (old != NULL) { | |
a3535c7e RR |
3133 | if (old->state == MODULE_STATE_COMING |
3134 | || old->state == MODULE_STATE_UNFORMED) { | |
3135 | /* Wait in case it fails to load. */ | |
3136 | mutex_unlock(&module_mutex); | |
3137 | err = wait_event_interruptible(module_wq, | |
3138 | finished_loading(mod->name)); | |
3139 | if (err) | |
3140 | goto out_unlocked; | |
3141 | goto again; | |
3142 | } | |
3143 | err = -EEXIST; | |
3144 | goto out; | |
3145 | } | |
3146 | list_add_rcu(&mod->list, &modules); | |
3147 | err = 0; | |
3148 | ||
3149 | out: | |
3150 | mutex_unlock(&module_mutex); | |
3151 | out_unlocked: | |
3152 | return err; | |
3153 | } | |
3154 | ||
3155 | static int complete_formation(struct module *mod, struct load_info *info) | |
3156 | { | |
3157 | int err; | |
3158 | ||
3159 | mutex_lock(&module_mutex); | |
3160 | ||
3161 | /* Find duplicate symbols (must be called under lock). */ | |
3162 | err = verify_export_symbols(mod); | |
3163 | if (err < 0) | |
3164 | goto out; | |
3165 | ||
3166 | /* This relies on module_mutex for list integrity. */ | |
3167 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3168 | ||
3169 | /* Mark state as coming so strong_try_module_get() ignores us, | |
3170 | * but kallsyms etc. can see us. */ | |
3171 | mod->state = MODULE_STATE_COMING; | |
3172 | ||
3173 | out: | |
3174 | mutex_unlock(&module_mutex); | |
3175 | return err; | |
3176 | } | |
3177 | ||
54041d8a RR |
3178 | static int unknown_module_param_cb(char *param, char *val, const char *modname) |
3179 | { | |
3180 | /* Check for magic 'dyndbg' arg */ | |
3181 | int ret = ddebug_dyndbg_module_param_cb(param, val, modname); | |
bddb12b3 AM |
3182 | if (ret != 0) |
3183 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3184 | return 0; |
3185 | } | |
3186 | ||
d913188c RR |
3187 | /* Allocate and load the module: note that size of section 0 is always |
3188 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3189 | static int load_module(struct load_info *info, const char __user *uargs, |
3190 | int flags) | |
d913188c | 3191 | { |
a3535c7e | 3192 | struct module *mod; |
d913188c | 3193 | long err; |
d913188c | 3194 | |
34e1169d KC |
3195 | err = module_sig_check(info); |
3196 | if (err) | |
3197 | goto free_copy; | |
d913188c | 3198 | |
34e1169d | 3199 | err = elf_header_check(info); |
d913188c | 3200 | if (err) |
34e1169d | 3201 | goto free_copy; |
d913188c RR |
3202 | |
3203 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3204 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3205 | if (IS_ERR(mod)) { |
3206 | err = PTR_ERR(mod); | |
d913188c | 3207 | goto free_copy; |
1da177e4 | 3208 | } |
1da177e4 | 3209 | |
a3535c7e RR |
3210 | /* Reserve our place in the list. */ |
3211 | err = add_unformed_module(mod); | |
3212 | if (err) | |
1fb9341a | 3213 | goto free_module; |
1fb9341a | 3214 | |
106a4ee2 | 3215 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3216 | mod->sig_ok = info->sig_ok; |
64748a2c | 3217 | if (!mod->sig_ok) { |
bddb12b3 AM |
3218 | pr_notice_once("%s: module verification failed: signature " |
3219 | "and/or required key missing - tainting " | |
3220 | "kernel\n", mod->name); | |
373d4d09 | 3221 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3222 | } |
106a4ee2 RR |
3223 | #endif |
3224 | ||
8d8022e8 | 3225 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3226 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3227 | if (err) |
3228 | goto unlink_mod; | |
3229 | ||
49668688 | 3230 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3231 | err = module_unload_init(mod); |
3232 | if (err) | |
1fb9341a | 3233 | goto unlink_mod; |
1da177e4 | 3234 | |
22e268eb RR |
3235 | /* Now we've got everything in the final locations, we can |
3236 | * find optional sections. */ | |
eb3057df FH |
3237 | err = find_module_sections(mod, info); |
3238 | if (err) | |
3239 | goto free_unload; | |
9b37ccfc | 3240 | |
49668688 | 3241 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3242 | if (err) |
3243 | goto free_unload; | |
9841d61d | 3244 | |
c988d2b2 | 3245 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3246 | setup_modinfo(mod, info); |
c988d2b2 | 3247 | |
1da177e4 | 3248 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3249 | err = simplify_symbols(mod, info); |
1da177e4 | 3250 | if (err < 0) |
d913188c | 3251 | goto free_modinfo; |
1da177e4 | 3252 | |
34e1169d | 3253 | err = apply_relocations(mod, info); |
22e268eb | 3254 | if (err < 0) |
d913188c | 3255 | goto free_modinfo; |
1da177e4 | 3256 | |
34e1169d | 3257 | err = post_relocation(mod, info); |
1da177e4 | 3258 | if (err < 0) |
d913188c | 3259 | goto free_modinfo; |
1da177e4 | 3260 | |
22e268eb | 3261 | flush_module_icache(mod); |
378bac82 | 3262 | |
6526c534 RR |
3263 | /* Now copy in args */ |
3264 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3265 | if (IS_ERR(mod->args)) { | |
3266 | err = PTR_ERR(mod->args); | |
3267 | goto free_arch_cleanup; | |
3268 | } | |
8d3b33f6 | 3269 | |
34e1169d | 3270 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3271 | |
a3535c7e RR |
3272 | /* Finally it's fully formed, ready to start executing. */ |
3273 | err = complete_formation(mod, info); | |
3274 | if (err) | |
1fb9341a | 3275 | goto ddebug_cleanup; |
be593f4c | 3276 | |
51f3d0f4 | 3277 | /* Module is ready to execute: parsing args may do that. */ |
026cee00 | 3278 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
54041d8a | 3279 | -32768, 32767, unknown_module_param_cb); |
1da177e4 | 3280 | if (err < 0) |
1fb9341a | 3281 | goto bug_cleanup; |
1da177e4 | 3282 | |
51f3d0f4 | 3283 | /* Link in to syfs. */ |
34e1169d | 3284 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3285 | if (err < 0) |
1fb9341a | 3286 | goto bug_cleanup; |
80a3d1bb | 3287 | |
48fd1188 | 3288 | /* Get rid of temporary copy. */ |
34e1169d | 3289 | free_copy(info); |
1da177e4 LT |
3290 | |
3291 | /* Done! */ | |
51f3d0f4 | 3292 | trace_module_load(mod); |
34e1169d KC |
3293 | |
3294 | return do_init_module(mod); | |
1da177e4 | 3295 | |
1fb9341a RR |
3296 | bug_cleanup: |
3297 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3298 | mutex_lock(&module_mutex); |
5336377d | 3299 | module_bug_cleanup(mod); |
ee61abb3 | 3300 | mutex_unlock(&module_mutex); |
a3535c7e | 3301 | ddebug_cleanup: |
1fb9341a | 3302 | dynamic_debug_remove(info->debug); |
e91defa2 | 3303 | synchronize_sched(); |
6526c534 RR |
3304 | kfree(mod->args); |
3305 | free_arch_cleanup: | |
1da177e4 | 3306 | module_arch_cleanup(mod); |
d913188c | 3307 | free_modinfo: |
a263f776 | 3308 | free_modinfo(mod); |
22e268eb | 3309 | free_unload: |
1da177e4 | 3310 | module_unload_free(mod); |
1fb9341a RR |
3311 | unlink_mod: |
3312 | mutex_lock(&module_mutex); | |
3313 | /* Unlink carefully: kallsyms could be walking list. */ | |
3314 | list_del_rcu(&mod->list); | |
3315 | wake_up_all(&module_wq); | |
3316 | mutex_unlock(&module_mutex); | |
d913188c | 3317 | free_module: |
34e1169d | 3318 | module_deallocate(mod, info); |
d913188c | 3319 | free_copy: |
34e1169d KC |
3320 | free_copy(info); |
3321 | return err; | |
b99b87f7 PO |
3322 | } |
3323 | ||
17da2bd9 HC |
3324 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3325 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3326 | { |
34e1169d KC |
3327 | int err; |
3328 | struct load_info info = { }; | |
1da177e4 | 3329 | |
34e1169d KC |
3330 | err = may_init_module(); |
3331 | if (err) | |
3332 | return err; | |
1da177e4 | 3333 | |
34e1169d KC |
3334 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3335 | umod, len, uargs); | |
1da177e4 | 3336 | |
34e1169d KC |
3337 | err = copy_module_from_user(umod, len, &info); |
3338 | if (err) | |
3339 | return err; | |
1da177e4 | 3340 | |
2f3238ae | 3341 | return load_module(&info, uargs, 0); |
34e1169d | 3342 | } |
94462ad3 | 3343 | |
2f3238ae | 3344 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d KC |
3345 | { |
3346 | int err; | |
3347 | struct load_info info = { }; | |
94462ad3 | 3348 | |
34e1169d KC |
3349 | err = may_init_module(); |
3350 | if (err) | |
3351 | return err; | |
1da177e4 | 3352 | |
2f3238ae | 3353 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3354 | |
2f3238ae RR |
3355 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3356 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3357 | return -EINVAL; | |
d6de2c80 | 3358 | |
34e1169d KC |
3359 | err = copy_module_from_fd(fd, &info); |
3360 | if (err) | |
3361 | return err; | |
1da177e4 | 3362 | |
2f3238ae | 3363 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3364 | } |
3365 | ||
3366 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3367 | { | |
3368 | return ((void *)addr >= start && (void *)addr < start + size); | |
3369 | } | |
3370 | ||
3371 | #ifdef CONFIG_KALLSYMS | |
3372 | /* | |
3373 | * This ignores the intensely annoying "mapping symbols" found | |
3374 | * in ARM ELF files: $a, $t and $d. | |
3375 | */ | |
3376 | static inline int is_arm_mapping_symbol(const char *str) | |
3377 | { | |
22a8bdeb | 3378 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
3379 | && (str[2] == '\0' || str[2] == '.'); |
3380 | } | |
3381 | ||
3382 | static const char *get_ksymbol(struct module *mod, | |
3383 | unsigned long addr, | |
3384 | unsigned long *size, | |
3385 | unsigned long *offset) | |
3386 | { | |
3387 | unsigned int i, best = 0; | |
3388 | unsigned long nextval; | |
3389 | ||
3390 | /* At worse, next value is at end of module */ | |
a06f6211 | 3391 | if (within_module_init(addr, mod)) |
1da177e4 | 3392 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 3393 | else |
1da177e4 LT |
3394 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
3395 | ||
25985edc | 3396 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3397 | starts real symbols at 1). */ |
1da177e4 LT |
3398 | for (i = 1; i < mod->num_symtab; i++) { |
3399 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
3400 | continue; | |
3401 | ||
3402 | /* We ignore unnamed symbols: they're uninformative | |
3403 | * and inserted at a whim. */ | |
3404 | if (mod->symtab[i].st_value <= addr | |
3405 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
3406 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3407 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3408 | best = i; | |
3409 | if (mod->symtab[i].st_value > addr | |
3410 | && mod->symtab[i].st_value < nextval | |
3411 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3412 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3413 | nextval = mod->symtab[i].st_value; | |
3414 | } | |
3415 | ||
3416 | if (!best) | |
3417 | return NULL; | |
3418 | ||
ffb45122 AD |
3419 | if (size) |
3420 | *size = nextval - mod->symtab[best].st_value; | |
3421 | if (offset) | |
3422 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
3423 | return mod->strtab + mod->symtab[best].st_name; |
3424 | } | |
3425 | ||
6dd06c9f RR |
3426 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3427 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3428 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3429 | unsigned long *size, |
3430 | unsigned long *offset, | |
3431 | char **modname, | |
3432 | char *namebuf) | |
1da177e4 LT |
3433 | { |
3434 | struct module *mod; | |
cb2a5205 | 3435 | const char *ret = NULL; |
1da177e4 | 3436 | |
cb2a5205 | 3437 | preempt_disable(); |
d72b3751 | 3438 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3439 | if (mod->state == MODULE_STATE_UNFORMED) |
3440 | continue; | |
a06f6211 MH |
3441 | if (within_module_init(addr, mod) || |
3442 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
3443 | if (modname) |
3444 | *modname = mod->name; | |
cb2a5205 RR |
3445 | ret = get_ksymbol(mod, addr, size, offset); |
3446 | break; | |
1da177e4 LT |
3447 | } |
3448 | } | |
6dd06c9f RR |
3449 | /* Make a copy in here where it's safe */ |
3450 | if (ret) { | |
3451 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3452 | ret = namebuf; | |
3453 | } | |
cb2a5205 | 3454 | preempt_enable(); |
92dfc9dc | 3455 | return ret; |
1da177e4 LT |
3456 | } |
3457 | ||
9d65cb4a AD |
3458 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3459 | { | |
3460 | struct module *mod; | |
3461 | ||
cb2a5205 | 3462 | preempt_disable(); |
d72b3751 | 3463 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3464 | if (mod->state == MODULE_STATE_UNFORMED) |
3465 | continue; | |
a06f6211 MH |
3466 | if (within_module_init(addr, mod) || |
3467 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
3468 | const char *sym; |
3469 | ||
3470 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3471 | if (!sym) | |
3472 | goto out; | |
9281acea | 3473 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3474 | preempt_enable(); |
9d65cb4a AD |
3475 | return 0; |
3476 | } | |
3477 | } | |
3478 | out: | |
cb2a5205 | 3479 | preempt_enable(); |
9d65cb4a AD |
3480 | return -ERANGE; |
3481 | } | |
3482 | ||
a5c43dae AD |
3483 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3484 | unsigned long *offset, char *modname, char *name) | |
3485 | { | |
3486 | struct module *mod; | |
3487 | ||
cb2a5205 | 3488 | preempt_disable(); |
d72b3751 | 3489 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3490 | if (mod->state == MODULE_STATE_UNFORMED) |
3491 | continue; | |
a06f6211 MH |
3492 | if (within_module_init(addr, mod) || |
3493 | within_module_core(addr, mod)) { | |
a5c43dae AD |
3494 | const char *sym; |
3495 | ||
3496 | sym = get_ksymbol(mod, addr, size, offset); | |
3497 | if (!sym) | |
3498 | goto out; | |
3499 | if (modname) | |
9281acea | 3500 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3501 | if (name) |
9281acea | 3502 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3503 | preempt_enable(); |
a5c43dae AD |
3504 | return 0; |
3505 | } | |
3506 | } | |
3507 | out: | |
cb2a5205 | 3508 | preempt_enable(); |
a5c43dae AD |
3509 | return -ERANGE; |
3510 | } | |
3511 | ||
ea07890a AD |
3512 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3513 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3514 | { |
3515 | struct module *mod; | |
3516 | ||
cb2a5205 | 3517 | preempt_disable(); |
d72b3751 | 3518 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3519 | if (mod->state == MODULE_STATE_UNFORMED) |
3520 | continue; | |
1da177e4 LT |
3521 | if (symnum < mod->num_symtab) { |
3522 | *value = mod->symtab[symnum].st_value; | |
3523 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 3524 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
3525 | KSYM_NAME_LEN); |
3526 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 3527 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3528 | preempt_enable(); |
ea07890a | 3529 | return 0; |
1da177e4 LT |
3530 | } |
3531 | symnum -= mod->num_symtab; | |
3532 | } | |
cb2a5205 | 3533 | preempt_enable(); |
ea07890a | 3534 | return -ERANGE; |
1da177e4 LT |
3535 | } |
3536 | ||
3537 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3538 | { | |
3539 | unsigned int i; | |
3540 | ||
3541 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
3542 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3543 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
3544 | return mod->symtab[i].st_value; |
3545 | return 0; | |
3546 | } | |
3547 | ||
3548 | /* Look for this name: can be of form module:name. */ | |
3549 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3550 | { | |
3551 | struct module *mod; | |
3552 | char *colon; | |
3553 | unsigned long ret = 0; | |
3554 | ||
3555 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3556 | preempt_disable(); |
1da177e4 | 3557 | if ((colon = strchr(name, ':')) != NULL) { |
4f6de4d5 | 3558 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 3559 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 3560 | } else { |
0d21b0e3 RR |
3561 | list_for_each_entry_rcu(mod, &modules, list) { |
3562 | if (mod->state == MODULE_STATE_UNFORMED) | |
3563 | continue; | |
1da177e4 LT |
3564 | if ((ret = mod_find_symname(mod, name)) != 0) |
3565 | break; | |
0d21b0e3 | 3566 | } |
1da177e4 | 3567 | } |
cb2a5205 | 3568 | preempt_enable(); |
1da177e4 LT |
3569 | return ret; |
3570 | } | |
75a66614 AK |
3571 | |
3572 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3573 | struct module *, unsigned long), | |
3574 | void *data) | |
3575 | { | |
3576 | struct module *mod; | |
3577 | unsigned int i; | |
3578 | int ret; | |
3579 | ||
3580 | list_for_each_entry(mod, &modules, list) { | |
0d21b0e3 RR |
3581 | if (mod->state == MODULE_STATE_UNFORMED) |
3582 | continue; | |
75a66614 AK |
3583 | for (i = 0; i < mod->num_symtab; i++) { |
3584 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3585 | mod, mod->symtab[i].st_value); | |
3586 | if (ret != 0) | |
3587 | return ret; | |
3588 | } | |
3589 | } | |
3590 | return 0; | |
3591 | } | |
1da177e4 LT |
3592 | #endif /* CONFIG_KALLSYMS */ |
3593 | ||
21aa9280 | 3594 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3595 | { |
3596 | int bx = 0; | |
3597 | ||
0d21b0e3 | 3598 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
3599 | if (mod->taints || |
3600 | mod->state == MODULE_STATE_GOING || | |
3601 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3602 | buf[bx++] = '('; |
cca3e707 | 3603 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
3604 | /* Show a - for module-is-being-unloaded */ |
3605 | if (mod->state == MODULE_STATE_GOING) | |
3606 | buf[bx++] = '-'; | |
3607 | /* Show a + for module-is-being-loaded */ | |
3608 | if (mod->state == MODULE_STATE_COMING) | |
3609 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3610 | buf[bx++] = ')'; |
3611 | } | |
3612 | buf[bx] = '\0'; | |
3613 | ||
3614 | return buf; | |
3615 | } | |
3616 | ||
3b5d5c6b AD |
3617 | #ifdef CONFIG_PROC_FS |
3618 | /* Called by the /proc file system to return a list of modules. */ | |
3619 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3620 | { | |
3621 | mutex_lock(&module_mutex); | |
3622 | return seq_list_start(&modules, *pos); | |
3623 | } | |
3624 | ||
3625 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3626 | { | |
3627 | return seq_list_next(p, &modules, pos); | |
3628 | } | |
3629 | ||
3630 | static void m_stop(struct seq_file *m, void *p) | |
3631 | { | |
3632 | mutex_unlock(&module_mutex); | |
3633 | } | |
3634 | ||
1da177e4 LT |
3635 | static int m_show(struct seq_file *m, void *p) |
3636 | { | |
3637 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3638 | char buf[8]; |
3639 | ||
0d21b0e3 RR |
3640 | /* We always ignore unformed modules. */ |
3641 | if (mod->state == MODULE_STATE_UNFORMED) | |
3642 | return 0; | |
3643 | ||
2f0f2a33 | 3644 | seq_printf(m, "%s %u", |
1da177e4 LT |
3645 | mod->name, mod->init_size + mod->core_size); |
3646 | print_unload_info(m, mod); | |
3647 | ||
3648 | /* Informative for users. */ | |
3649 | seq_printf(m, " %s", | |
3650 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
3651 | mod->state == MODULE_STATE_COMING ? "Loading": | |
3652 | "Live"); | |
3653 | /* Used by oprofile and other similar tools. */ | |
9f36e2c4 | 3654 | seq_printf(m, " 0x%pK", mod->module_core); |
1da177e4 | 3655 | |
fa3ba2e8 FM |
3656 | /* Taints info */ |
3657 | if (mod->taints) | |
21aa9280 | 3658 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3659 | |
1da177e4 LT |
3660 | seq_printf(m, "\n"); |
3661 | return 0; | |
3662 | } | |
3663 | ||
3664 | /* Format: modulename size refcount deps address | |
3665 | ||
3666 | Where refcount is a number or -, and deps is a comma-separated list | |
3667 | of depends or -. | |
3668 | */ | |
3b5d5c6b | 3669 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3670 | .start = m_start, |
3671 | .next = m_next, | |
3672 | .stop = m_stop, | |
3673 | .show = m_show | |
3674 | }; | |
3675 | ||
3b5d5c6b AD |
3676 | static int modules_open(struct inode *inode, struct file *file) |
3677 | { | |
3678 | return seq_open(file, &modules_op); | |
3679 | } | |
3680 | ||
3681 | static const struct file_operations proc_modules_operations = { | |
3682 | .open = modules_open, | |
3683 | .read = seq_read, | |
3684 | .llseek = seq_lseek, | |
3685 | .release = seq_release, | |
3686 | }; | |
3687 | ||
3688 | static int __init proc_modules_init(void) | |
3689 | { | |
3690 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3691 | return 0; | |
3692 | } | |
3693 | module_init(proc_modules_init); | |
3694 | #endif | |
3695 | ||
1da177e4 LT |
3696 | /* Given an address, look for it in the module exception tables. */ |
3697 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3698 | { | |
1da177e4 LT |
3699 | const struct exception_table_entry *e = NULL; |
3700 | struct module *mod; | |
3701 | ||
24da1cbf | 3702 | preempt_disable(); |
d72b3751 | 3703 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3704 | if (mod->state == MODULE_STATE_UNFORMED) |
3705 | continue; | |
1da177e4 LT |
3706 | if (mod->num_exentries == 0) |
3707 | continue; | |
22a8bdeb | 3708 | |
1da177e4 LT |
3709 | e = search_extable(mod->extable, |
3710 | mod->extable + mod->num_exentries - 1, | |
3711 | addr); | |
3712 | if (e) | |
3713 | break; | |
3714 | } | |
24da1cbf | 3715 | preempt_enable(); |
1da177e4 LT |
3716 | |
3717 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3718 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3719 | return e; |
3720 | } | |
3721 | ||
4d435f9d | 3722 | /* |
e610499e RR |
3723 | * is_module_address - is this address inside a module? |
3724 | * @addr: the address to check. | |
3725 | * | |
3726 | * See is_module_text_address() if you simply want to see if the address | |
3727 | * is code (not data). | |
4d435f9d | 3728 | */ |
e610499e | 3729 | bool is_module_address(unsigned long addr) |
4d435f9d | 3730 | { |
e610499e | 3731 | bool ret; |
4d435f9d | 3732 | |
24da1cbf | 3733 | preempt_disable(); |
e610499e | 3734 | ret = __module_address(addr) != NULL; |
24da1cbf | 3735 | preempt_enable(); |
4d435f9d | 3736 | |
e610499e | 3737 | return ret; |
4d435f9d IM |
3738 | } |
3739 | ||
e610499e RR |
3740 | /* |
3741 | * __module_address - get the module which contains an address. | |
3742 | * @addr: the address. | |
3743 | * | |
3744 | * Must be called with preempt disabled or module mutex held so that | |
3745 | * module doesn't get freed during this. | |
3746 | */ | |
714f83d5 | 3747 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3748 | { |
3749 | struct module *mod; | |
3750 | ||
3a642e99 RR |
3751 | if (addr < module_addr_min || addr > module_addr_max) |
3752 | return NULL; | |
3753 | ||
0d21b0e3 RR |
3754 | list_for_each_entry_rcu(mod, &modules, list) { |
3755 | if (mod->state == MODULE_STATE_UNFORMED) | |
3756 | continue; | |
e610499e RR |
3757 | if (within_module_core(addr, mod) |
3758 | || within_module_init(addr, mod)) | |
1da177e4 | 3759 | return mod; |
0d21b0e3 | 3760 | } |
1da177e4 LT |
3761 | return NULL; |
3762 | } | |
c6b37801 | 3763 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3764 | |
e610499e RR |
3765 | /* |
3766 | * is_module_text_address - is this address inside module code? | |
3767 | * @addr: the address to check. | |
3768 | * | |
3769 | * See is_module_address() if you simply want to see if the address is | |
3770 | * anywhere in a module. See kernel_text_address() for testing if an | |
3771 | * address corresponds to kernel or module code. | |
3772 | */ | |
3773 | bool is_module_text_address(unsigned long addr) | |
3774 | { | |
3775 | bool ret; | |
3776 | ||
3777 | preempt_disable(); | |
3778 | ret = __module_text_address(addr) != NULL; | |
3779 | preempt_enable(); | |
3780 | ||
3781 | return ret; | |
3782 | } | |
3783 | ||
3784 | /* | |
3785 | * __module_text_address - get the module whose code contains an address. | |
3786 | * @addr: the address. | |
3787 | * | |
3788 | * Must be called with preempt disabled or module mutex held so that | |
3789 | * module doesn't get freed during this. | |
3790 | */ | |
3791 | struct module *__module_text_address(unsigned long addr) | |
3792 | { | |
3793 | struct module *mod = __module_address(addr); | |
3794 | if (mod) { | |
3795 | /* Make sure it's within the text section. */ | |
3796 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3797 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3798 | mod = NULL; | |
3799 | } | |
3800 | return mod; | |
3801 | } | |
c6b37801 | 3802 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3803 | |
1da177e4 LT |
3804 | /* Don't grab lock, we're oopsing. */ |
3805 | void print_modules(void) | |
3806 | { | |
3807 | struct module *mod; | |
2bc2d61a | 3808 | char buf[8]; |
1da177e4 | 3809 | |
b231125a | 3810 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3811 | /* Most callers should already have preempt disabled, but make sure */ |
3812 | preempt_disable(); | |
0d21b0e3 RR |
3813 | list_for_each_entry_rcu(mod, &modules, list) { |
3814 | if (mod->state == MODULE_STATE_UNFORMED) | |
3815 | continue; | |
21aa9280 | 3816 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 3817 | } |
d72b3751 | 3818 | preempt_enable(); |
e14af7ee AV |
3819 | if (last_unloaded_module[0]) |
3820 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3821 | printk("\n"); |
3822 | } | |
3823 | ||
1da177e4 | 3824 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3825 | /* Generate the signature for all relevant module structures here. |
3826 | * If these change, we don't want to try to parse the module. */ | |
3827 | void module_layout(struct module *mod, | |
3828 | struct modversion_info *ver, | |
3829 | struct kernel_param *kp, | |
3830 | struct kernel_symbol *ks, | |
65498646 | 3831 | struct tracepoint * const *tp) |
8c8ef42a RR |
3832 | { |
3833 | } | |
3834 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3835 | #endif |