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 | 45 | #include <linux/device.h> |
c988d2b2 | 46 | #include <linux/string.h> |
97d1f15b | 47 | #include <linux/mutex.h> |
d72b3751 | 48 | #include <linux/rculist.h> |
1da177e4 | 49 | #include <asm/uaccess.h> |
1da177e4 | 50 | #include <asm/cacheflush.h> |
eb8cdec4 | 51 | #include <asm/mmu_context.h> |
b817f6fe | 52 | #include <linux/license.h> |
6d762394 | 53 | #include <asm/sections.h> |
97e1c18e | 54 | #include <linux/tracepoint.h> |
90d595fe | 55 | #include <linux/ftrace.h> |
22a9d645 | 56 | #include <linux/async.h> |
fbf59bc9 | 57 | #include <linux/percpu.h> |
4f2294b6 | 58 | #include <linux/kmemleak.h> |
bf5438fc | 59 | #include <linux/jump_label.h> |
84e1c6bb | 60 | #include <linux/pfn.h> |
403ed278 | 61 | #include <linux/bsearch.h> |
2f3238ae | 62 | #include <uapi/linux/module.h> |
106a4ee2 | 63 | #include "module-internal.h" |
1da177e4 | 64 | |
7ead8b83 LZ |
65 | #define CREATE_TRACE_POINTS |
66 | #include <trace/events/module.h> | |
67 | ||
1da177e4 LT |
68 | #ifndef ARCH_SHF_SMALL |
69 | #define ARCH_SHF_SMALL 0 | |
70 | #endif | |
71 | ||
84e1c6bb | 72 | /* |
73 | * Modules' sections will be aligned on page boundaries | |
74 | * to ensure complete separation of code and data, but | |
75 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y | |
76 | */ | |
77 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
78 | # define debug_align(X) ALIGN(X, PAGE_SIZE) | |
79 | #else | |
80 | # define debug_align(X) (X) | |
81 | #endif | |
82 | ||
83 | /* | |
84 | * Given BASE and SIZE this macro calculates the number of pages the | |
85 | * memory regions occupies | |
86 | */ | |
87 | #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \ | |
88 | (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \ | |
89 | PFN_DOWN((unsigned long)BASE) + 1) \ | |
90 | : (0UL)) | |
91 | ||
1da177e4 LT |
92 | /* If this is set, the section belongs in the init part of the module */ |
93 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
94 | ||
75676500 RR |
95 | /* |
96 | * Mutex protects: | |
97 | * 1) List of modules (also safely readable with preempt_disable), | |
98 | * 2) module_use links, | |
99 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 100 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
101 | DEFINE_MUTEX(module_mutex); |
102 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 103 | static LIST_HEAD(modules); |
67fc4e0c JW |
104 | #ifdef CONFIG_KGDB_KDB |
105 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
106 | #endif /* CONFIG_KGDB_KDB */ | |
107 | ||
106a4ee2 RR |
108 | #ifdef CONFIG_MODULE_SIG |
109 | #ifdef CONFIG_MODULE_SIG_FORCE | |
110 | static bool sig_enforce = true; | |
111 | #else | |
112 | static bool sig_enforce = false; | |
113 | ||
114 | static int param_set_bool_enable_only(const char *val, | |
115 | const struct kernel_param *kp) | |
116 | { | |
117 | int err; | |
118 | bool test; | |
119 | struct kernel_param dummy_kp = *kp; | |
120 | ||
121 | dummy_kp.arg = &test; | |
122 | ||
123 | err = param_set_bool(val, &dummy_kp); | |
124 | if (err) | |
125 | return err; | |
126 | ||
127 | /* Don't let them unset it once it's set! */ | |
128 | if (!test && sig_enforce) | |
129 | return -EROFS; | |
130 | ||
131 | if (test) | |
132 | sig_enforce = true; | |
133 | return 0; | |
134 | } | |
135 | ||
136 | static const struct kernel_param_ops param_ops_bool_enable_only = { | |
6a4c2643 | 137 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
106a4ee2 RR |
138 | .set = param_set_bool_enable_only, |
139 | .get = param_get_bool, | |
140 | }; | |
141 | #define param_check_bool_enable_only param_check_bool | |
142 | ||
143 | module_param(sig_enforce, bool_enable_only, 0644); | |
144 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
145 | #endif /* CONFIG_MODULE_SIG */ | |
1da177e4 | 146 | |
19e4529e SR |
147 | /* Block module loading/unloading? */ |
148 | int modules_disabled = 0; | |
02608bef | 149 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 150 | |
c9a3ba55 RR |
151 | /* Waiting for a module to finish initializing? */ |
152 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
153 | ||
e041c683 | 154 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 155 | |
75676500 RR |
156 | /* Bounds of module allocation, for speeding __module_address. |
157 | * Protected by module_mutex. */ | |
3a642e99 RR |
158 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
159 | ||
6da0b565 | 160 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 161 | { |
e041c683 | 162 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
163 | } |
164 | EXPORT_SYMBOL(register_module_notifier); | |
165 | ||
6da0b565 | 166 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 167 | { |
e041c683 | 168 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
169 | } |
170 | EXPORT_SYMBOL(unregister_module_notifier); | |
171 | ||
eded41c1 RR |
172 | struct load_info { |
173 | Elf_Ehdr *hdr; | |
174 | unsigned long len; | |
175 | Elf_Shdr *sechdrs; | |
6526c534 | 176 | char *secstrings, *strtab; |
d913188c | 177 | unsigned long symoffs, stroffs; |
811d66a0 RR |
178 | struct _ddebug *debug; |
179 | unsigned int num_debug; | |
106a4ee2 | 180 | bool sig_ok; |
eded41c1 RR |
181 | struct { |
182 | unsigned int sym, str, mod, vers, info, pcpu; | |
183 | } index; | |
184 | }; | |
185 | ||
9a4b9708 ML |
186 | /* We require a truly strong try_module_get(): 0 means failure due to |
187 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
188 | static inline int strong_try_module_get(struct module *mod) |
189 | { | |
0d21b0e3 | 190 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 191 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
192 | return -EBUSY; |
193 | if (try_module_get(mod)) | |
1da177e4 | 194 | return 0; |
c9a3ba55 RR |
195 | else |
196 | return -ENOENT; | |
1da177e4 LT |
197 | } |
198 | ||
373d4d09 RR |
199 | static inline void add_taint_module(struct module *mod, unsigned flag, |
200 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 201 | { |
373d4d09 | 202 | add_taint(flag, lockdep_ok); |
25ddbb18 | 203 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
204 | } |
205 | ||
02a3e59a RD |
206 | /* |
207 | * A thread that wants to hold a reference to a module only while it | |
208 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
209 | */ |
210 | void __module_put_and_exit(struct module *mod, long code) | |
211 | { | |
212 | module_put(mod); | |
213 | do_exit(code); | |
214 | } | |
215 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 216 | |
1da177e4 | 217 | /* Find a module section: 0 means not found. */ |
49668688 | 218 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
219 | { |
220 | unsigned int i; | |
221 | ||
49668688 RR |
222 | for (i = 1; i < info->hdr->e_shnum; i++) { |
223 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 224 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
225 | if ((shdr->sh_flags & SHF_ALLOC) |
226 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 227 | return i; |
49668688 | 228 | } |
1da177e4 LT |
229 | return 0; |
230 | } | |
231 | ||
5e458cc0 | 232 | /* Find a module section, or NULL. */ |
49668688 | 233 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
234 | { |
235 | /* Section 0 has sh_addr 0. */ | |
49668688 | 236 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
237 | } |
238 | ||
239 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 240 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
241 | const char *name, |
242 | size_t object_size, | |
243 | unsigned int *num) | |
244 | { | |
49668688 | 245 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
246 | |
247 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
248 | *num = info->sechdrs[sec].sh_size / object_size; |
249 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
250 | } |
251 | ||
1da177e4 LT |
252 | /* Provided by the linker */ |
253 | extern const struct kernel_symbol __start___ksymtab[]; | |
254 | extern const struct kernel_symbol __stop___ksymtab[]; | |
255 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
256 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
257 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
258 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
259 | extern const unsigned long __start___kcrctab[]; |
260 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 261 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
262 | #ifdef CONFIG_UNUSED_SYMBOLS |
263 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
264 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
265 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
266 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
267 | extern const unsigned long __start___kcrctab_unused[]; |
268 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 269 | #endif |
1da177e4 LT |
270 | |
271 | #ifndef CONFIG_MODVERSIONS | |
272 | #define symversion(base, idx) NULL | |
273 | #else | |
f83ca9fe | 274 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
275 | #endif |
276 | ||
dafd0940 RR |
277 | static bool each_symbol_in_section(const struct symsearch *arr, |
278 | unsigned int arrsize, | |
279 | struct module *owner, | |
280 | bool (*fn)(const struct symsearch *syms, | |
281 | struct module *owner, | |
de4d8d53 | 282 | void *data), |
dafd0940 | 283 | void *data) |
ad9546c9 | 284 | { |
de4d8d53 | 285 | unsigned int j; |
ad9546c9 | 286 | |
dafd0940 | 287 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
288 | if (fn(&arr[j], owner, data)) |
289 | return true; | |
f71d20e9 | 290 | } |
dafd0940 RR |
291 | |
292 | return false; | |
ad9546c9 RR |
293 | } |
294 | ||
dafd0940 | 295 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
296 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
297 | struct module *owner, | |
298 | void *data), | |
299 | void *data) | |
ad9546c9 RR |
300 | { |
301 | struct module *mod; | |
44032e63 | 302 | static const struct symsearch arr[] = { |
ad9546c9 | 303 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 304 | NOT_GPL_ONLY, false }, |
ad9546c9 | 305 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
306 | __start___kcrctab_gpl, |
307 | GPL_ONLY, false }, | |
ad9546c9 | 308 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
309 | __start___kcrctab_gpl_future, |
310 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 311 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 312 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
313 | __start___kcrctab_unused, |
314 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 315 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
316 | __start___kcrctab_unused_gpl, |
317 | GPL_ONLY, true }, | |
f7f5b675 | 318 | #endif |
ad9546c9 | 319 | }; |
f71d20e9 | 320 | |
dafd0940 RR |
321 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
322 | return true; | |
f71d20e9 | 323 | |
d72b3751 | 324 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
325 | struct symsearch arr[] = { |
326 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 327 | NOT_GPL_ONLY, false }, |
ad9546c9 | 328 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
329 | mod->gpl_crcs, |
330 | GPL_ONLY, false }, | |
ad9546c9 RR |
331 | { mod->gpl_future_syms, |
332 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
333 | mod->gpl_future_crcs, |
334 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 335 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
336 | { mod->unused_syms, |
337 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
338 | mod->unused_crcs, |
339 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
340 | { mod->unused_gpl_syms, |
341 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
342 | mod->unused_gpl_crcs, |
343 | GPL_ONLY, true }, | |
f7f5b675 | 344 | #endif |
ad9546c9 RR |
345 | }; |
346 | ||
0d21b0e3 RR |
347 | if (mod->state == MODULE_STATE_UNFORMED) |
348 | continue; | |
349 | ||
dafd0940 RR |
350 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
351 | return true; | |
352 | } | |
353 | return false; | |
354 | } | |
de4d8d53 | 355 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
356 | |
357 | struct find_symbol_arg { | |
358 | /* Input */ | |
359 | const char *name; | |
360 | bool gplok; | |
361 | bool warn; | |
362 | ||
363 | /* Output */ | |
364 | struct module *owner; | |
365 | const unsigned long *crc; | |
414fd31b | 366 | const struct kernel_symbol *sym; |
dafd0940 RR |
367 | }; |
368 | ||
de4d8d53 RR |
369 | static bool check_symbol(const struct symsearch *syms, |
370 | struct module *owner, | |
371 | unsigned int symnum, void *data) | |
dafd0940 RR |
372 | { |
373 | struct find_symbol_arg *fsa = data; | |
374 | ||
dafd0940 RR |
375 | if (!fsa->gplok) { |
376 | if (syms->licence == GPL_ONLY) | |
377 | return false; | |
378 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
379 | pr_warn("Symbol %s is being used by a non-GPL module, " |
380 | "which will not be allowed in the future\n", | |
381 | fsa->name); | |
9f28bb7e | 382 | } |
1da177e4 | 383 | } |
ad9546c9 | 384 | |
f7f5b675 | 385 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 386 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
387 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
388 | "using it.\n", fsa->name); | |
389 | pr_warn("This symbol will go away in the future.\n"); | |
390 | pr_warn("Please evalute if this is the right api to use and if " | |
391 | "it really is, submit a report the linux kernel " | |
392 | "mailinglist together with submitting your code for " | |
393 | "inclusion.\n"); | |
dafd0940 | 394 | } |
f7f5b675 | 395 | #endif |
dafd0940 RR |
396 | |
397 | fsa->owner = owner; | |
398 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 399 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
400 | return true; |
401 | } | |
402 | ||
403ed278 AIB |
403 | static int cmp_name(const void *va, const void *vb) |
404 | { | |
405 | const char *a; | |
406 | const struct kernel_symbol *b; | |
407 | a = va; b = vb; | |
408 | return strcmp(a, b->name); | |
409 | } | |
410 | ||
de4d8d53 RR |
411 | static bool find_symbol_in_section(const struct symsearch *syms, |
412 | struct module *owner, | |
413 | void *data) | |
414 | { | |
415 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
416 | struct kernel_symbol *sym; |
417 | ||
418 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
419 | sizeof(struct kernel_symbol), cmp_name); | |
420 | ||
421 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
422 | return true; | |
de4d8d53 | 423 | |
de4d8d53 RR |
424 | return false; |
425 | } | |
426 | ||
414fd31b | 427 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 428 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
429 | const struct kernel_symbol *find_symbol(const char *name, |
430 | struct module **owner, | |
431 | const unsigned long **crc, | |
432 | bool gplok, | |
433 | bool warn) | |
dafd0940 RR |
434 | { |
435 | struct find_symbol_arg fsa; | |
436 | ||
437 | fsa.name = name; | |
438 | fsa.gplok = gplok; | |
439 | fsa.warn = warn; | |
440 | ||
de4d8d53 | 441 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
442 | if (owner) |
443 | *owner = fsa.owner; | |
444 | if (crc) | |
445 | *crc = fsa.crc; | |
414fd31b | 446 | return fsa.sym; |
dafd0940 RR |
447 | } |
448 | ||
5e124169 | 449 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 450 | return NULL; |
1da177e4 | 451 | } |
c6b37801 | 452 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 453 | |
1da177e4 | 454 | /* Search for module by name: must hold module_mutex. */ |
4f6de4d5 | 455 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 456 | bool even_unformed) |
1da177e4 LT |
457 | { |
458 | struct module *mod; | |
459 | ||
460 | list_for_each_entry(mod, &modules, list) { | |
0d21b0e3 RR |
461 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
462 | continue; | |
4f6de4d5 | 463 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
464 | return mod; |
465 | } | |
466 | return NULL; | |
467 | } | |
0d21b0e3 RR |
468 | |
469 | struct module *find_module(const char *name) | |
470 | { | |
4f6de4d5 | 471 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 472 | } |
c6b37801 | 473 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
474 | |
475 | #ifdef CONFIG_SMP | |
fbf59bc9 | 476 | |
259354de | 477 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 478 | { |
259354de TH |
479 | return mod->percpu; |
480 | } | |
fbf59bc9 | 481 | |
9eb76d77 | 482 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 483 | { |
9eb76d77 RR |
484 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
485 | unsigned long align = pcpusec->sh_addralign; | |
486 | ||
487 | if (!pcpusec->sh_size) | |
488 | return 0; | |
489 | ||
fbf59bc9 | 490 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
491 | pr_warn("%s: per-cpu alignment %li > %li\n", |
492 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
493 | align = PAGE_SIZE; |
494 | } | |
495 | ||
9eb76d77 | 496 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 497 | if (!mod->percpu) { |
bddb12b3 AM |
498 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
499 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
500 | return -ENOMEM; |
501 | } | |
9eb76d77 | 502 | mod->percpu_size = pcpusec->sh_size; |
259354de | 503 | return 0; |
fbf59bc9 TH |
504 | } |
505 | ||
259354de | 506 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 507 | { |
259354de | 508 | free_percpu(mod->percpu); |
fbf59bc9 TH |
509 | } |
510 | ||
49668688 | 511 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 512 | { |
49668688 | 513 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
514 | } |
515 | ||
259354de TH |
516 | static void percpu_modcopy(struct module *mod, |
517 | const void *from, unsigned long size) | |
6b588c18 TH |
518 | { |
519 | int cpu; | |
520 | ||
521 | for_each_possible_cpu(cpu) | |
259354de | 522 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
523 | } |
524 | ||
10fad5e4 TH |
525 | /** |
526 | * is_module_percpu_address - test whether address is from module static percpu | |
527 | * @addr: address to test | |
528 | * | |
529 | * Test whether @addr belongs to module static percpu area. | |
530 | * | |
531 | * RETURNS: | |
532 | * %true if @addr is from module static percpu area | |
533 | */ | |
534 | bool is_module_percpu_address(unsigned long addr) | |
535 | { | |
536 | struct module *mod; | |
537 | unsigned int cpu; | |
538 | ||
539 | preempt_disable(); | |
540 | ||
541 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
542 | if (mod->state == MODULE_STATE_UNFORMED) |
543 | continue; | |
10fad5e4 TH |
544 | if (!mod->percpu_size) |
545 | continue; | |
546 | for_each_possible_cpu(cpu) { | |
547 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
548 | ||
549 | if ((void *)addr >= start && | |
550 | (void *)addr < start + mod->percpu_size) { | |
551 | preempt_enable(); | |
552 | return true; | |
553 | } | |
554 | } | |
555 | } | |
556 | ||
557 | preempt_enable(); | |
558 | return false; | |
6b588c18 TH |
559 | } |
560 | ||
1da177e4 | 561 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 562 | |
259354de | 563 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
564 | { |
565 | return NULL; | |
566 | } | |
9eb76d77 | 567 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 568 | { |
9eb76d77 RR |
569 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
570 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
571 | return -ENOMEM; | |
572 | return 0; | |
259354de TH |
573 | } |
574 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 575 | { |
1da177e4 | 576 | } |
49668688 | 577 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
578 | { |
579 | return 0; | |
580 | } | |
259354de TH |
581 | static inline void percpu_modcopy(struct module *mod, |
582 | const void *from, unsigned long size) | |
1da177e4 LT |
583 | { |
584 | /* pcpusec should be 0, and size of that section should be 0. */ | |
585 | BUG_ON(size != 0); | |
586 | } | |
10fad5e4 TH |
587 | bool is_module_percpu_address(unsigned long addr) |
588 | { | |
589 | return false; | |
590 | } | |
6b588c18 | 591 | |
1da177e4 LT |
592 | #endif /* CONFIG_SMP */ |
593 | ||
c988d2b2 MD |
594 | #define MODINFO_ATTR(field) \ |
595 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
596 | { \ | |
597 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
598 | } \ | |
599 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 600 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 601 | { \ |
cc56ded3 | 602 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
603 | } \ |
604 | static int modinfo_##field##_exists(struct module *mod) \ | |
605 | { \ | |
606 | return mod->field != NULL; \ | |
607 | } \ | |
608 | static void free_modinfo_##field(struct module *mod) \ | |
609 | { \ | |
22a8bdeb DW |
610 | kfree(mod->field); \ |
611 | mod->field = NULL; \ | |
c988d2b2 MD |
612 | } \ |
613 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 614 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
615 | .show = show_modinfo_##field, \ |
616 | .setup = setup_modinfo_##field, \ | |
617 | .test = modinfo_##field##_exists, \ | |
618 | .free = free_modinfo_##field, \ | |
619 | }; | |
620 | ||
621 | MODINFO_ATTR(version); | |
622 | MODINFO_ATTR(srcversion); | |
623 | ||
e14af7ee AV |
624 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
625 | ||
03e88ae1 | 626 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
627 | |
628 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
629 | ||
e513cc1c MH |
630 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
631 | #define MODULE_REF_BASE 1 | |
632 | ||
1da177e4 | 633 | /* Init the unload section of the module. */ |
9f85a4bb | 634 | static int module_unload_init(struct module *mod) |
1da177e4 | 635 | { |
e513cc1c MH |
636 | /* |
637 | * Initialize reference counter to MODULE_REF_BASE. | |
638 | * refcnt == 0 means module is going. | |
639 | */ | |
640 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 641 | |
2c02dfe7 LT |
642 | INIT_LIST_HEAD(&mod->source_list); |
643 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 644 | |
1da177e4 | 645 | /* Hold reference count during initialization. */ |
e513cc1c | 646 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
647 | |
648 | return 0; | |
1da177e4 LT |
649 | } |
650 | ||
1da177e4 LT |
651 | /* Does a already use b? */ |
652 | static int already_uses(struct module *a, struct module *b) | |
653 | { | |
654 | struct module_use *use; | |
655 | ||
2c02dfe7 LT |
656 | list_for_each_entry(use, &b->source_list, source_list) { |
657 | if (use->source == a) { | |
5e124169 | 658 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
659 | return 1; |
660 | } | |
661 | } | |
5e124169 | 662 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
663 | return 0; |
664 | } | |
665 | ||
2c02dfe7 LT |
666 | /* |
667 | * Module a uses b | |
668 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
669 | * - the module_use is added to the list of 'b' sources (so | |
670 | * 'b' can walk the list to see who sourced them), and of 'a' | |
671 | * targets (so 'a' can see what modules it targets). | |
672 | */ | |
673 | static int add_module_usage(struct module *a, struct module *b) | |
674 | { | |
2c02dfe7 LT |
675 | struct module_use *use; |
676 | ||
5e124169 | 677 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
678 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
679 | if (!use) { | |
bddb12b3 | 680 | pr_warn("%s: out of memory loading\n", a->name); |
2c02dfe7 LT |
681 | return -ENOMEM; |
682 | } | |
683 | ||
684 | use->source = a; | |
685 | use->target = b; | |
686 | list_add(&use->source_list, &b->source_list); | |
687 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
688 | return 0; |
689 | } | |
690 | ||
75676500 | 691 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 692 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 693 | { |
c8e21ced | 694 | int err; |
270a6c4c | 695 | |
9bea7f23 | 696 | if (b == NULL || already_uses(a, b)) |
218ce735 | 697 | return 0; |
218ce735 | 698 | |
9bea7f23 RR |
699 | /* If module isn't available, we fail. */ |
700 | err = strong_try_module_get(b); | |
c9a3ba55 | 701 | if (err) |
9bea7f23 | 702 | return err; |
1da177e4 | 703 | |
2c02dfe7 LT |
704 | err = add_module_usage(a, b); |
705 | if (err) { | |
1da177e4 | 706 | module_put(b); |
9bea7f23 | 707 | return err; |
1da177e4 | 708 | } |
9bea7f23 | 709 | return 0; |
1da177e4 | 710 | } |
9bea7f23 | 711 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
712 | |
713 | /* Clear the unload stuff of the module. */ | |
714 | static void module_unload_free(struct module *mod) | |
715 | { | |
2c02dfe7 | 716 | struct module_use *use, *tmp; |
1da177e4 | 717 | |
75676500 | 718 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
719 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
720 | struct module *i = use->target; | |
5e124169 | 721 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
722 | module_put(i); |
723 | list_del(&use->source_list); | |
724 | list_del(&use->target_list); | |
725 | kfree(use); | |
1da177e4 | 726 | } |
75676500 | 727 | mutex_unlock(&module_mutex); |
1da177e4 LT |
728 | } |
729 | ||
730 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 731 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
732 | { |
733 | int ret = (flags & O_TRUNC); | |
734 | if (ret) | |
373d4d09 | 735 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
736 | return ret; |
737 | } | |
738 | #else | |
fb169793 | 739 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
740 | { |
741 | return 0; | |
742 | } | |
743 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
744 | ||
e513cc1c MH |
745 | /* Try to release refcount of module, 0 means success. */ |
746 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 747 | { |
e513cc1c | 748 | int ret; |
1da177e4 | 749 | |
e513cc1c MH |
750 | /* Try to decrement refcnt which we set at loading */ |
751 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
752 | BUG_ON(ret < 0); | |
753 | if (ret) | |
754 | /* Someone can put this right now, recover with checking */ | |
755 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 756 | |
e513cc1c MH |
757 | return ret; |
758 | } | |
1da177e4 | 759 | |
e513cc1c MH |
760 | static int try_stop_module(struct module *mod, int flags, int *forced) |
761 | { | |
da39ba5e | 762 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
763 | if (try_release_module_ref(mod) != 0) { |
764 | *forced = try_force_unload(flags); | |
765 | if (!(*forced)) | |
1da177e4 LT |
766 | return -EWOULDBLOCK; |
767 | } | |
768 | ||
769 | /* Mark it as dying. */ | |
e513cc1c | 770 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 771 | |
e513cc1c | 772 | return 0; |
1da177e4 LT |
773 | } |
774 | ||
d5db139a RR |
775 | /** |
776 | * module_refcount - return the refcount or -1 if unloading | |
777 | * | |
778 | * @mod: the module we're checking | |
779 | * | |
780 | * Returns: | |
781 | * -1 if the module is in the process of unloading | |
782 | * otherwise the number of references in the kernel to the module | |
783 | */ | |
784 | int module_refcount(struct module *mod) | |
1da177e4 | 785 | { |
d5db139a | 786 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
787 | } |
788 | EXPORT_SYMBOL(module_refcount); | |
789 | ||
790 | /* This exists whether we can unload or not */ | |
791 | static void free_module(struct module *mod); | |
792 | ||
17da2bd9 HC |
793 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
794 | unsigned int, flags) | |
1da177e4 LT |
795 | { |
796 | struct module *mod; | |
dfff0a06 | 797 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
798 | int ret, forced = 0; |
799 | ||
3d43321b | 800 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
801 | return -EPERM; |
802 | ||
803 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
804 | return -EFAULT; | |
805 | name[MODULE_NAME_LEN-1] = '\0'; | |
806 | ||
3fc1f1e2 TH |
807 | if (mutex_lock_interruptible(&module_mutex) != 0) |
808 | return -EINTR; | |
1da177e4 LT |
809 | |
810 | mod = find_module(name); | |
811 | if (!mod) { | |
812 | ret = -ENOENT; | |
813 | goto out; | |
814 | } | |
815 | ||
2c02dfe7 | 816 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
817 | /* Other modules depend on us: get rid of them first. */ |
818 | ret = -EWOULDBLOCK; | |
819 | goto out; | |
820 | } | |
821 | ||
822 | /* Doing init or already dying? */ | |
823 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 824 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 825 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
826 | ret = -EBUSY; |
827 | goto out; | |
828 | } | |
829 | ||
830 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 831 | if (mod->init && !mod->exit) { |
fb169793 | 832 | forced = try_force_unload(flags); |
1da177e4 LT |
833 | if (!forced) { |
834 | /* This module can't be removed */ | |
835 | ret = -EBUSY; | |
836 | goto out; | |
837 | } | |
838 | } | |
839 | ||
1da177e4 LT |
840 | /* Stop the machine so refcounts can't move and disable module. */ |
841 | ret = try_stop_module(mod, flags, &forced); | |
842 | if (ret != 0) | |
843 | goto out; | |
844 | ||
df4b565e | 845 | mutex_unlock(&module_mutex); |
25985edc | 846 | /* Final destruction now no one is using it. */ |
df4b565e | 847 | if (mod->exit != NULL) |
1da177e4 | 848 | mod->exit(); |
df4b565e PO |
849 | blocking_notifier_call_chain(&module_notify_list, |
850 | MODULE_STATE_GOING, mod); | |
22a9d645 | 851 | async_synchronize_full(); |
75676500 | 852 | |
e14af7ee | 853 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 854 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 855 | |
75676500 RR |
856 | free_module(mod); |
857 | return 0; | |
858 | out: | |
6389a385 | 859 | mutex_unlock(&module_mutex); |
1da177e4 LT |
860 | return ret; |
861 | } | |
862 | ||
d1e99d7a | 863 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
864 | { |
865 | struct module_use *use; | |
866 | int printed_something = 0; | |
867 | ||
d5db139a | 868 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 869 | |
6da0b565 IA |
870 | /* |
871 | * Always include a trailing , so userspace can differentiate | |
872 | * between this and the old multi-field proc format. | |
873 | */ | |
2c02dfe7 | 874 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 875 | printed_something = 1; |
2c02dfe7 | 876 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
877 | } |
878 | ||
1da177e4 LT |
879 | if (mod->init != NULL && mod->exit == NULL) { |
880 | printed_something = 1; | |
6da0b565 | 881 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
882 | } |
883 | ||
884 | if (!printed_something) | |
6da0b565 | 885 | seq_puts(m, "-"); |
1da177e4 LT |
886 | } |
887 | ||
888 | void __symbol_put(const char *symbol) | |
889 | { | |
890 | struct module *owner; | |
1da177e4 | 891 | |
24da1cbf | 892 | preempt_disable(); |
414fd31b | 893 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
894 | BUG(); |
895 | module_put(owner); | |
24da1cbf | 896 | preempt_enable(); |
1da177e4 LT |
897 | } |
898 | EXPORT_SYMBOL(__symbol_put); | |
899 | ||
7d1d16e4 | 900 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
901 | void symbol_put_addr(void *addr) |
902 | { | |
5e376613 | 903 | struct module *modaddr; |
7d1d16e4 | 904 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 905 | |
7d1d16e4 | 906 | if (core_kernel_text(a)) |
5e376613 | 907 | return; |
1da177e4 | 908 | |
a6e6abd5 RR |
909 | /* module_text_address is safe here: we're supposed to have reference |
910 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 911 | modaddr = __module_text_address(a); |
a6e6abd5 | 912 | BUG_ON(!modaddr); |
5e376613 | 913 | module_put(modaddr); |
1da177e4 LT |
914 | } |
915 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
916 | ||
917 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 918 | struct module_kobject *mk, char *buffer) |
1da177e4 | 919 | { |
d5db139a | 920 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
921 | } |
922 | ||
cca3e707 KS |
923 | static struct module_attribute modinfo_refcnt = |
924 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 925 | |
d53799be SR |
926 | void __module_get(struct module *module) |
927 | { | |
928 | if (module) { | |
929 | preempt_disable(); | |
2f35c41f | 930 | atomic_inc(&module->refcnt); |
d53799be SR |
931 | trace_module_get(module, _RET_IP_); |
932 | preempt_enable(); | |
933 | } | |
934 | } | |
935 | EXPORT_SYMBOL(__module_get); | |
936 | ||
937 | bool try_module_get(struct module *module) | |
938 | { | |
939 | bool ret = true; | |
940 | ||
941 | if (module) { | |
942 | preempt_disable(); | |
e513cc1c MH |
943 | /* Note: here, we can fail to get a reference */ |
944 | if (likely(module_is_live(module) && | |
945 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 946 | trace_module_get(module, _RET_IP_); |
e513cc1c | 947 | else |
d53799be SR |
948 | ret = false; |
949 | ||
950 | preempt_enable(); | |
951 | } | |
952 | return ret; | |
953 | } | |
954 | EXPORT_SYMBOL(try_module_get); | |
955 | ||
f6a57033 AV |
956 | void module_put(struct module *module) |
957 | { | |
e513cc1c MH |
958 | int ret; |
959 | ||
f6a57033 | 960 | if (module) { |
e1783a24 | 961 | preempt_disable(); |
e513cc1c MH |
962 | ret = atomic_dec_if_positive(&module->refcnt); |
963 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 964 | trace_module_put(module, _RET_IP_); |
e1783a24 | 965 | preempt_enable(); |
f6a57033 AV |
966 | } |
967 | } | |
968 | EXPORT_SYMBOL(module_put); | |
969 | ||
1da177e4 | 970 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 971 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
972 | { |
973 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 974 | seq_puts(m, " - -"); |
1da177e4 LT |
975 | } |
976 | ||
977 | static inline void module_unload_free(struct module *mod) | |
978 | { | |
979 | } | |
980 | ||
9bea7f23 | 981 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 982 | { |
9bea7f23 | 983 | return strong_try_module_get(b); |
1da177e4 | 984 | } |
9bea7f23 | 985 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 986 | |
9f85a4bb | 987 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 988 | { |
9f85a4bb | 989 | return 0; |
1da177e4 LT |
990 | } |
991 | #endif /* CONFIG_MODULE_UNLOAD */ | |
992 | ||
53999bf3 KW |
993 | static size_t module_flags_taint(struct module *mod, char *buf) |
994 | { | |
995 | size_t l = 0; | |
996 | ||
997 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) | |
998 | buf[l++] = 'P'; | |
999 | if (mod->taints & (1 << TAINT_OOT_MODULE)) | |
1000 | buf[l++] = 'O'; | |
1001 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) | |
1002 | buf[l++] = 'F'; | |
1003 | if (mod->taints & (1 << TAINT_CRAP)) | |
1004 | buf[l++] = 'C'; | |
66cc69e3 | 1005 | if (mod->taints & (1 << TAINT_UNSIGNED_MODULE)) |
57673c2b | 1006 | buf[l++] = 'E'; |
53999bf3 KW |
1007 | /* |
1008 | * TAINT_FORCED_RMMOD: could be added. | |
8c90487c | 1009 | * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
53999bf3 KW |
1010 | * apply to modules. |
1011 | */ | |
1012 | return l; | |
1013 | } | |
1014 | ||
1f71740a | 1015 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1016 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1017 | { |
1018 | const char *state = "unknown"; | |
1019 | ||
4befb026 | 1020 | switch (mk->mod->state) { |
1f71740a KS |
1021 | case MODULE_STATE_LIVE: |
1022 | state = "live"; | |
1023 | break; | |
1024 | case MODULE_STATE_COMING: | |
1025 | state = "coming"; | |
1026 | break; | |
1027 | case MODULE_STATE_GOING: | |
1028 | state = "going"; | |
1029 | break; | |
0d21b0e3 RR |
1030 | default: |
1031 | BUG(); | |
1f71740a KS |
1032 | } |
1033 | return sprintf(buffer, "%s\n", state); | |
1034 | } | |
1035 | ||
cca3e707 KS |
1036 | static struct module_attribute modinfo_initstate = |
1037 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1038 | |
88bfa324 KS |
1039 | static ssize_t store_uevent(struct module_attribute *mattr, |
1040 | struct module_kobject *mk, | |
1041 | const char *buffer, size_t count) | |
1042 | { | |
1043 | enum kobject_action action; | |
1044 | ||
1045 | if (kobject_action_type(buffer, count, &action) == 0) | |
1046 | kobject_uevent(&mk->kobj, action); | |
1047 | return count; | |
1048 | } | |
1049 | ||
cca3e707 KS |
1050 | struct module_attribute module_uevent = |
1051 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1052 | ||
1053 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1054 | struct module_kobject *mk, char *buffer) | |
1055 | { | |
1056 | return sprintf(buffer, "%u\n", mk->mod->core_size); | |
1057 | } | |
1058 | ||
1059 | static struct module_attribute modinfo_coresize = | |
1060 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1061 | ||
1062 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1063 | struct module_kobject *mk, char *buffer) | |
1064 | { | |
1065 | return sprintf(buffer, "%u\n", mk->mod->init_size); | |
1066 | } | |
1067 | ||
1068 | static struct module_attribute modinfo_initsize = | |
1069 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1070 | ||
1071 | static ssize_t show_taint(struct module_attribute *mattr, | |
1072 | struct module_kobject *mk, char *buffer) | |
1073 | { | |
1074 | size_t l; | |
1075 | ||
1076 | l = module_flags_taint(mk->mod, buffer); | |
1077 | buffer[l++] = '\n'; | |
1078 | return l; | |
1079 | } | |
1080 | ||
1081 | static struct module_attribute modinfo_taint = | |
1082 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1083 | |
03e88ae1 | 1084 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1085 | &module_uevent, |
03e88ae1 GKH |
1086 | &modinfo_version, |
1087 | &modinfo_srcversion, | |
cca3e707 KS |
1088 | &modinfo_initstate, |
1089 | &modinfo_coresize, | |
1090 | &modinfo_initsize, | |
1091 | &modinfo_taint, | |
03e88ae1 | 1092 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1093 | &modinfo_refcnt, |
03e88ae1 GKH |
1094 | #endif |
1095 | NULL, | |
1096 | }; | |
1097 | ||
1da177e4 LT |
1098 | static const char vermagic[] = VERMAGIC_STRING; |
1099 | ||
c6e665c8 | 1100 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1101 | { |
1102 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1103 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1104 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1105 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1106 | return 0; |
1107 | #else | |
1108 | return -ENOEXEC; | |
1109 | #endif | |
1110 | } | |
1111 | ||
1da177e4 | 1112 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
1113 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1114 | static unsigned long maybe_relocated(unsigned long crc, | |
1115 | const struct module *crc_owner) | |
1116 | { | |
1117 | #ifdef ARCH_RELOCATES_KCRCTAB | |
1118 | if (crc_owner == NULL) | |
1119 | return crc - (unsigned long)reloc_start; | |
1120 | #endif | |
1121 | return crc; | |
1122 | } | |
1123 | ||
1da177e4 LT |
1124 | static int check_version(Elf_Shdr *sechdrs, |
1125 | unsigned int versindex, | |
1126 | const char *symname, | |
6da0b565 | 1127 | struct module *mod, |
d4703aef RR |
1128 | const unsigned long *crc, |
1129 | const struct module *crc_owner) | |
1da177e4 LT |
1130 | { |
1131 | unsigned int i, num_versions; | |
1132 | struct modversion_info *versions; | |
1133 | ||
1134 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1135 | if (!crc) | |
1136 | return 1; | |
1137 | ||
a5dd6970 RR |
1138 | /* No versions at all? modprobe --force does this. */ |
1139 | if (versindex == 0) | |
1140 | return try_to_force_load(mod, symname) == 0; | |
1141 | ||
1da177e4 LT |
1142 | versions = (void *) sechdrs[versindex].sh_addr; |
1143 | num_versions = sechdrs[versindex].sh_size | |
1144 | / sizeof(struct modversion_info); | |
1145 | ||
1146 | for (i = 0; i < num_versions; i++) { | |
1147 | if (strcmp(versions[i].name, symname) != 0) | |
1148 | continue; | |
1149 | ||
d4703aef | 1150 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1151 | return 1; |
5e124169 | 1152 | pr_debug("Found checksum %lX vs module %lX\n", |
d4703aef | 1153 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1154 | goto bad_version; |
1da177e4 | 1155 | } |
826e4506 | 1156 | |
bddb12b3 | 1157 | pr_warn("%s: no symbol version for %s\n", mod->name, symname); |
a5dd6970 | 1158 | return 0; |
826e4506 LT |
1159 | |
1160 | bad_version: | |
6da0b565 | 1161 | pr_warn("%s: disagrees about version of symbol %s\n", |
826e4506 LT |
1162 | mod->name, symname); |
1163 | return 0; | |
1da177e4 LT |
1164 | } |
1165 | ||
1166 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1167 | unsigned int versindex, | |
1168 | struct module *mod) | |
1169 | { | |
1170 | const unsigned long *crc; | |
1da177e4 | 1171 | |
75676500 RR |
1172 | /* Since this should be found in kernel (which can't be removed), |
1173 | * no locking is necessary. */ | |
b92021b0 | 1174 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
6560dc16 | 1175 | &crc, true, false)) |
1da177e4 | 1176 | BUG(); |
a4b6a77b JH |
1177 | return check_version(sechdrs, versindex, |
1178 | VMLINUX_SYMBOL_STR(module_layout), mod, crc, | |
d4703aef | 1179 | NULL); |
1da177e4 LT |
1180 | } |
1181 | ||
91e37a79 RR |
1182 | /* First part is kernel version, which we ignore if module has crcs. */ |
1183 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1184 | bool has_crcs) | |
1da177e4 | 1185 | { |
91e37a79 RR |
1186 | if (has_crcs) { |
1187 | amagic += strcspn(amagic, " "); | |
1188 | bmagic += strcspn(bmagic, " "); | |
1189 | } | |
1da177e4 LT |
1190 | return strcmp(amagic, bmagic) == 0; |
1191 | } | |
1192 | #else | |
1193 | static inline int check_version(Elf_Shdr *sechdrs, | |
1194 | unsigned int versindex, | |
1195 | const char *symname, | |
6da0b565 | 1196 | struct module *mod, |
d4703aef RR |
1197 | const unsigned long *crc, |
1198 | const struct module *crc_owner) | |
1da177e4 LT |
1199 | { |
1200 | return 1; | |
1201 | } | |
1202 | ||
1203 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1204 | unsigned int versindex, | |
1205 | struct module *mod) | |
1206 | { | |
1207 | return 1; | |
1208 | } | |
1209 | ||
91e37a79 RR |
1210 | static inline int same_magic(const char *amagic, const char *bmagic, |
1211 | bool has_crcs) | |
1da177e4 LT |
1212 | { |
1213 | return strcmp(amagic, bmagic) == 0; | |
1214 | } | |
1215 | #endif /* CONFIG_MODVERSIONS */ | |
1216 | ||
75676500 | 1217 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1218 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1219 | const struct load_info *info, | |
414fd31b | 1220 | const char *name, |
9bea7f23 | 1221 | char ownername[]) |
1da177e4 LT |
1222 | { |
1223 | struct module *owner; | |
414fd31b | 1224 | const struct kernel_symbol *sym; |
1da177e4 | 1225 | const unsigned long *crc; |
9bea7f23 | 1226 | int err; |
1da177e4 | 1227 | |
75676500 | 1228 | mutex_lock(&module_mutex); |
414fd31b | 1229 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1230 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1231 | if (!sym) |
1232 | goto unlock; | |
1233 | ||
49668688 RR |
1234 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1235 | owner)) { | |
9bea7f23 RR |
1236 | sym = ERR_PTR(-EINVAL); |
1237 | goto getname; | |
1da177e4 | 1238 | } |
9bea7f23 RR |
1239 | |
1240 | err = ref_module(mod, owner); | |
1241 | if (err) { | |
1242 | sym = ERR_PTR(err); | |
1243 | goto getname; | |
1244 | } | |
1245 | ||
1246 | getname: | |
1247 | /* We must make copy under the lock if we failed to get ref. */ | |
1248 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1249 | unlock: | |
75676500 | 1250 | mutex_unlock(&module_mutex); |
218ce735 | 1251 | return sym; |
1da177e4 LT |
1252 | } |
1253 | ||
49668688 RR |
1254 | static const struct kernel_symbol * |
1255 | resolve_symbol_wait(struct module *mod, | |
1256 | const struct load_info *info, | |
1257 | const char *name) | |
9bea7f23 RR |
1258 | { |
1259 | const struct kernel_symbol *ksym; | |
49668688 | 1260 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1261 | |
1262 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1263 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1264 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1265 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1266 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1267 | mod->name, owner); | |
9bea7f23 RR |
1268 | } |
1269 | return ksym; | |
1270 | } | |
1271 | ||
1da177e4 LT |
1272 | /* |
1273 | * /sys/module/foo/sections stuff | |
1274 | * J. Corbet <corbet@lwn.net> | |
1275 | */ | |
8f6d0378 | 1276 | #ifdef CONFIG_SYSFS |
10b465aa | 1277 | |
8f6d0378 | 1278 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1279 | static inline bool sect_empty(const Elf_Shdr *sect) |
1280 | { | |
1281 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1282 | } | |
1283 | ||
6da0b565 | 1284 | struct module_sect_attr { |
a58730c4 RR |
1285 | struct module_attribute mattr; |
1286 | char *name; | |
1287 | unsigned long address; | |
1288 | }; | |
1289 | ||
6da0b565 | 1290 | struct module_sect_attrs { |
a58730c4 RR |
1291 | struct attribute_group grp; |
1292 | unsigned int nsections; | |
1293 | struct module_sect_attr attrs[0]; | |
1294 | }; | |
1295 | ||
1da177e4 | 1296 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1297 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1298 | { |
1299 | struct module_sect_attr *sattr = | |
1300 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1301 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1302 | } |
1303 | ||
04b1db9f IN |
1304 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1305 | { | |
a58730c4 | 1306 | unsigned int section; |
04b1db9f IN |
1307 | |
1308 | for (section = 0; section < sect_attrs->nsections; section++) | |
1309 | kfree(sect_attrs->attrs[section].name); | |
1310 | kfree(sect_attrs); | |
1311 | } | |
1312 | ||
8f6d0378 | 1313 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1314 | { |
1315 | unsigned int nloaded = 0, i, size[2]; | |
1316 | struct module_sect_attrs *sect_attrs; | |
1317 | struct module_sect_attr *sattr; | |
1318 | struct attribute **gattr; | |
22a8bdeb | 1319 | |
1da177e4 | 1320 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1321 | for (i = 0; i < info->hdr->e_shnum; i++) |
1322 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1323 | nloaded++; |
1324 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1325 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1326 | sizeof(sect_attrs->grp.attrs[0])); | |
1327 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1328 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1329 | if (sect_attrs == NULL) | |
1da177e4 LT |
1330 | return; |
1331 | ||
1332 | /* Setup section attributes. */ | |
1333 | sect_attrs->grp.name = "sections"; | |
1334 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1335 | ||
04b1db9f | 1336 | sect_attrs->nsections = 0; |
1da177e4 LT |
1337 | sattr = §_attrs->attrs[0]; |
1338 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1339 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1340 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1341 | if (sect_empty(sec)) | |
35dead42 | 1342 | continue; |
8f6d0378 RR |
1343 | sattr->address = sec->sh_addr; |
1344 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1345 | GFP_KERNEL); |
1346 | if (sattr->name == NULL) | |
1347 | goto out; | |
1348 | sect_attrs->nsections++; | |
361795b1 | 1349 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1350 | sattr->mattr.show = module_sect_show; |
1351 | sattr->mattr.store = NULL; | |
1352 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1353 | sattr->mattr.attr.mode = S_IRUGO; |
1354 | *(gattr++) = &(sattr++)->mattr.attr; | |
1355 | } | |
1356 | *gattr = NULL; | |
1357 | ||
1358 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1359 | goto out; | |
1360 | ||
1361 | mod->sect_attrs = sect_attrs; | |
1362 | return; | |
1363 | out: | |
04b1db9f | 1364 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1365 | } |
1366 | ||
1367 | static void remove_sect_attrs(struct module *mod) | |
1368 | { | |
1369 | if (mod->sect_attrs) { | |
1370 | sysfs_remove_group(&mod->mkobj.kobj, | |
1371 | &mod->sect_attrs->grp); | |
1372 | /* We are positive that no one is using any sect attrs | |
1373 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1374 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1375 | mod->sect_attrs = NULL; |
1376 | } | |
1377 | } | |
1378 | ||
6d760133 RM |
1379 | /* |
1380 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1381 | */ | |
1382 | ||
1383 | struct module_notes_attrs { | |
1384 | struct kobject *dir; | |
1385 | unsigned int notes; | |
1386 | struct bin_attribute attrs[0]; | |
1387 | }; | |
1388 | ||
2c3c8bea | 1389 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1390 | struct bin_attribute *bin_attr, |
1391 | char *buf, loff_t pos, size_t count) | |
1392 | { | |
1393 | /* | |
1394 | * The caller checked the pos and count against our size. | |
1395 | */ | |
1396 | memcpy(buf, bin_attr->private + pos, count); | |
1397 | return count; | |
1398 | } | |
1399 | ||
1400 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1401 | unsigned int i) | |
1402 | { | |
1403 | if (notes_attrs->dir) { | |
1404 | while (i-- > 0) | |
1405 | sysfs_remove_bin_file(notes_attrs->dir, | |
1406 | ¬es_attrs->attrs[i]); | |
e9432093 | 1407 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1408 | } |
1409 | kfree(notes_attrs); | |
1410 | } | |
1411 | ||
8f6d0378 | 1412 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1413 | { |
1414 | unsigned int notes, loaded, i; | |
1415 | struct module_notes_attrs *notes_attrs; | |
1416 | struct bin_attribute *nattr; | |
1417 | ||
ea6bff36 IM |
1418 | /* failed to create section attributes, so can't create notes */ |
1419 | if (!mod->sect_attrs) | |
1420 | return; | |
1421 | ||
6d760133 RM |
1422 | /* Count notes sections and allocate structures. */ |
1423 | notes = 0; | |
8f6d0378 RR |
1424 | for (i = 0; i < info->hdr->e_shnum; i++) |
1425 | if (!sect_empty(&info->sechdrs[i]) && | |
1426 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1427 | ++notes; |
1428 | ||
1429 | if (notes == 0) | |
1430 | return; | |
1431 | ||
1432 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1433 | + notes * sizeof(notes_attrs->attrs[0]), | |
1434 | GFP_KERNEL); | |
1435 | if (notes_attrs == NULL) | |
1436 | return; | |
1437 | ||
1438 | notes_attrs->notes = notes; | |
1439 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1440 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1441 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1442 | continue; |
8f6d0378 | 1443 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1444 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1445 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1446 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1447 | nattr->size = info->sechdrs[i].sh_size; |
1448 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1449 | nattr->read = module_notes_read; |
1450 | ++nattr; | |
1451 | } | |
1452 | ++loaded; | |
1453 | } | |
1454 | ||
4ff6abff | 1455 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1456 | if (!notes_attrs->dir) |
1457 | goto out; | |
1458 | ||
1459 | for (i = 0; i < notes; ++i) | |
1460 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1461 | ¬es_attrs->attrs[i])) | |
1462 | goto out; | |
1463 | ||
1464 | mod->notes_attrs = notes_attrs; | |
1465 | return; | |
1466 | ||
1467 | out: | |
1468 | free_notes_attrs(notes_attrs, i); | |
1469 | } | |
1470 | ||
1471 | static void remove_notes_attrs(struct module *mod) | |
1472 | { | |
1473 | if (mod->notes_attrs) | |
1474 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1475 | } | |
1476 | ||
1da177e4 | 1477 | #else |
04b1db9f | 1478 | |
8f6d0378 RR |
1479 | static inline void add_sect_attrs(struct module *mod, |
1480 | const struct load_info *info) | |
1da177e4 LT |
1481 | { |
1482 | } | |
1483 | ||
1484 | static inline void remove_sect_attrs(struct module *mod) | |
1485 | { | |
1486 | } | |
6d760133 | 1487 | |
8f6d0378 RR |
1488 | static inline void add_notes_attrs(struct module *mod, |
1489 | const struct load_info *info) | |
6d760133 RM |
1490 | { |
1491 | } | |
1492 | ||
1493 | static inline void remove_notes_attrs(struct module *mod) | |
1494 | { | |
1495 | } | |
8f6d0378 | 1496 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1497 | |
80a3d1bb RR |
1498 | static void add_usage_links(struct module *mod) |
1499 | { | |
1500 | #ifdef CONFIG_MODULE_UNLOAD | |
1501 | struct module_use *use; | |
1502 | int nowarn; | |
1503 | ||
75676500 | 1504 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1505 | list_for_each_entry(use, &mod->target_list, target_list) { |
1506 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1507 | &mod->mkobj.kobj, mod->name); | |
1508 | } | |
75676500 | 1509 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1510 | #endif |
1511 | } | |
1512 | ||
1513 | static void del_usage_links(struct module *mod) | |
1514 | { | |
1515 | #ifdef CONFIG_MODULE_UNLOAD | |
1516 | struct module_use *use; | |
1517 | ||
75676500 | 1518 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1519 | list_for_each_entry(use, &mod->target_list, target_list) |
1520 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1521 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1522 | #endif |
1523 | } | |
1524 | ||
6407ebb2 | 1525 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1526 | { |
1527 | struct module_attribute *attr; | |
03e88ae1 | 1528 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1529 | int error = 0; |
1530 | int i; | |
1531 | ||
03e88ae1 GKH |
1532 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1533 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1534 | GFP_KERNEL); | |
1535 | if (!mod->modinfo_attrs) | |
1536 | return -ENOMEM; | |
1537 | ||
1538 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1539 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1540 | if (!attr->test || | |
03e88ae1 GKH |
1541 | (attr->test && attr->test(mod))) { |
1542 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1543 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1544 | error = sysfs_create_file(&mod->mkobj.kobj, |
1545 | &temp_attr->attr); | |
03e88ae1 GKH |
1546 | ++temp_attr; |
1547 | } | |
c988d2b2 MD |
1548 | } |
1549 | return error; | |
1550 | } | |
1551 | ||
6407ebb2 | 1552 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1553 | { |
1554 | struct module_attribute *attr; | |
1555 | int i; | |
1556 | ||
03e88ae1 GKH |
1557 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1558 | /* pick a field to test for end of list */ | |
1559 | if (!attr->attr.name) | |
1560 | break; | |
6da0b565 | 1561 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1562 | if (attr->free) |
1563 | attr->free(mod); | |
c988d2b2 | 1564 | } |
03e88ae1 | 1565 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1566 | } |
1da177e4 | 1567 | |
942e4431 LZ |
1568 | static void mod_kobject_put(struct module *mod) |
1569 | { | |
1570 | DECLARE_COMPLETION_ONSTACK(c); | |
1571 | mod->mkobj.kobj_completion = &c; | |
1572 | kobject_put(&mod->mkobj.kobj); | |
1573 | wait_for_completion(&c); | |
1574 | } | |
1575 | ||
6407ebb2 | 1576 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1577 | { |
1578 | int err; | |
6494a93d | 1579 | struct kobject *kobj; |
1da177e4 | 1580 | |
823bccfc | 1581 | if (!module_sysfs_initialized) { |
bddb12b3 | 1582 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1583 | err = -EINVAL; |
1584 | goto out; | |
1585 | } | |
6494a93d GKH |
1586 | |
1587 | kobj = kset_find_obj(module_kset, mod->name); | |
1588 | if (kobj) { | |
bddb12b3 | 1589 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1590 | kobject_put(kobj); |
1591 | err = -EINVAL; | |
1592 | goto out; | |
1593 | } | |
1594 | ||
1da177e4 | 1595 | mod->mkobj.mod = mod; |
e17e0f51 | 1596 | |
ac3c8141 GKH |
1597 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1598 | mod->mkobj.kobj.kset = module_kset; | |
1599 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1600 | "%s", mod->name); | |
1601 | if (err) | |
942e4431 | 1602 | mod_kobject_put(mod); |
270a6c4c | 1603 | |
97c146ef | 1604 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1605 | out: |
1606 | return err; | |
1607 | } | |
1608 | ||
6407ebb2 | 1609 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1610 | const struct load_info *info, |
270a6c4c KS |
1611 | struct kernel_param *kparam, |
1612 | unsigned int num_params) | |
1613 | { | |
1614 | int err; | |
1615 | ||
80a3d1bb RR |
1616 | err = mod_sysfs_init(mod); |
1617 | if (err) | |
1618 | goto out; | |
1619 | ||
4ff6abff | 1620 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1621 | if (!mod->holders_dir) { |
1622 | err = -ENOMEM; | |
270a6c4c | 1623 | goto out_unreg; |
240936e1 | 1624 | } |
270a6c4c | 1625 | |
1da177e4 LT |
1626 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1627 | if (err) | |
270a6c4c | 1628 | goto out_unreg_holders; |
1da177e4 | 1629 | |
c988d2b2 MD |
1630 | err = module_add_modinfo_attrs(mod); |
1631 | if (err) | |
e17e0f51 | 1632 | goto out_unreg_param; |
c988d2b2 | 1633 | |
80a3d1bb | 1634 | add_usage_links(mod); |
8f6d0378 RR |
1635 | add_sect_attrs(mod, info); |
1636 | add_notes_attrs(mod, info); | |
80a3d1bb | 1637 | |
e17e0f51 | 1638 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1639 | return 0; |
1640 | ||
e17e0f51 KS |
1641 | out_unreg_param: |
1642 | module_param_sysfs_remove(mod); | |
270a6c4c | 1643 | out_unreg_holders: |
78a2d906 | 1644 | kobject_put(mod->holders_dir); |
270a6c4c | 1645 | out_unreg: |
942e4431 | 1646 | mod_kobject_put(mod); |
80a3d1bb | 1647 | out: |
1da177e4 LT |
1648 | return err; |
1649 | } | |
34e4e2fe DL |
1650 | |
1651 | static void mod_sysfs_fini(struct module *mod) | |
1652 | { | |
8f6d0378 RR |
1653 | remove_notes_attrs(mod); |
1654 | remove_sect_attrs(mod); | |
942e4431 | 1655 | mod_kobject_put(mod); |
34e4e2fe DL |
1656 | } |
1657 | ||
8f6d0378 | 1658 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1659 | |
8f6d0378 RR |
1660 | static int mod_sysfs_setup(struct module *mod, |
1661 | const struct load_info *info, | |
6407ebb2 RR |
1662 | struct kernel_param *kparam, |
1663 | unsigned int num_params) | |
1664 | { | |
1665 | return 0; | |
1666 | } | |
1667 | ||
34e4e2fe DL |
1668 | static void mod_sysfs_fini(struct module *mod) |
1669 | { | |
1670 | } | |
1671 | ||
36b0360d RR |
1672 | static void module_remove_modinfo_attrs(struct module *mod) |
1673 | { | |
1674 | } | |
1675 | ||
80a3d1bb RR |
1676 | static void del_usage_links(struct module *mod) |
1677 | { | |
1678 | } | |
1679 | ||
34e4e2fe | 1680 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1681 | |
36b0360d | 1682 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1683 | { |
80a3d1bb | 1684 | del_usage_links(mod); |
c988d2b2 | 1685 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1686 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1687 | kobject_put(mod->mkobj.drivers_dir); |
1688 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1689 | mod_sysfs_fini(mod); |
1da177e4 LT |
1690 | } |
1691 | ||
84e1c6bb | 1692 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1693 | /* | |
1694 | * LKM RO/NX protection: protect module's text/ro-data | |
1695 | * from modification and any data from execution. | |
1696 | */ | |
1697 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) | |
1698 | { | |
1699 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); | |
1700 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); | |
1701 | ||
1702 | if (end_pfn > begin_pfn) | |
1703 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1704 | } | |
1705 | ||
1706 | static void set_section_ro_nx(void *base, | |
1707 | unsigned long text_size, | |
1708 | unsigned long ro_size, | |
1709 | unsigned long total_size) | |
1710 | { | |
1711 | /* begin and end PFNs of the current subsection */ | |
1712 | unsigned long begin_pfn; | |
1713 | unsigned long end_pfn; | |
1714 | ||
1715 | /* | |
1716 | * Set RO for module text and RO-data: | |
1717 | * - Always protect first page. | |
1718 | * - Do not protect last partial page. | |
1719 | */ | |
1720 | if (ro_size > 0) | |
1721 | set_page_attributes(base, base + ro_size, set_memory_ro); | |
1722 | ||
1723 | /* | |
1724 | * Set NX permissions for module data: | |
1725 | * - Do not protect first partial page. | |
1726 | * - Always protect last page. | |
1727 | */ | |
1728 | if (total_size > text_size) { | |
1729 | begin_pfn = PFN_UP((unsigned long)base + text_size); | |
1730 | end_pfn = PFN_UP((unsigned long)base + total_size); | |
1731 | if (end_pfn > begin_pfn) | |
1732 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1733 | } | |
1734 | } | |
1735 | ||
01526ed0 JG |
1736 | static void unset_module_core_ro_nx(struct module *mod) |
1737 | { | |
1738 | set_page_attributes(mod->module_core + mod->core_text_size, | |
1739 | mod->module_core + mod->core_size, | |
1740 | set_memory_x); | |
1741 | set_page_attributes(mod->module_core, | |
1742 | mod->module_core + mod->core_ro_size, | |
1743 | set_memory_rw); | |
1744 | } | |
1745 | ||
1746 | static void unset_module_init_ro_nx(struct module *mod) | |
1747 | { | |
1748 | set_page_attributes(mod->module_init + mod->init_text_size, | |
1749 | mod->module_init + mod->init_size, | |
1750 | set_memory_x); | |
1751 | set_page_attributes(mod->module_init, | |
1752 | mod->module_init + mod->init_ro_size, | |
1753 | set_memory_rw); | |
84e1c6bb | 1754 | } |
1755 | ||
1756 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1757 | void set_all_modules_text_rw(void) |
84e1c6bb | 1758 | { |
1759 | struct module *mod; | |
1760 | ||
1761 | mutex_lock(&module_mutex); | |
1762 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1763 | if (mod->state == MODULE_STATE_UNFORMED) |
1764 | continue; | |
84e1c6bb | 1765 | if ((mod->module_core) && (mod->core_text_size)) { |
1766 | set_page_attributes(mod->module_core, | |
1767 | mod->module_core + mod->core_text_size, | |
1768 | set_memory_rw); | |
1769 | } | |
1770 | if ((mod->module_init) && (mod->init_text_size)) { | |
1771 | set_page_attributes(mod->module_init, | |
1772 | mod->module_init + mod->init_text_size, | |
1773 | set_memory_rw); | |
1774 | } | |
1775 | } | |
1776 | mutex_unlock(&module_mutex); | |
1777 | } | |
1778 | ||
1779 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1780 | void set_all_modules_text_ro(void) |
84e1c6bb | 1781 | { |
1782 | struct module *mod; | |
1783 | ||
1784 | mutex_lock(&module_mutex); | |
1785 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1786 | if (mod->state == MODULE_STATE_UNFORMED) |
1787 | continue; | |
84e1c6bb | 1788 | if ((mod->module_core) && (mod->core_text_size)) { |
1789 | set_page_attributes(mod->module_core, | |
1790 | mod->module_core + mod->core_text_size, | |
1791 | set_memory_ro); | |
1792 | } | |
1793 | if ((mod->module_init) && (mod->init_text_size)) { | |
1794 | set_page_attributes(mod->module_init, | |
1795 | mod->module_init + mod->init_text_size, | |
1796 | set_memory_ro); | |
1797 | } | |
1798 | } | |
1799 | mutex_unlock(&module_mutex); | |
1800 | } | |
1801 | #else | |
1802 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } | |
01526ed0 JG |
1803 | static void unset_module_core_ro_nx(struct module *mod) { } |
1804 | static void unset_module_init_ro_nx(struct module *mod) { } | |
84e1c6bb | 1805 | #endif |
1806 | ||
be1f221c | 1807 | void __weak module_memfree(void *module_region) |
74e08fcf JB |
1808 | { |
1809 | vfree(module_region); | |
1810 | } | |
1811 | ||
1812 | void __weak module_arch_cleanup(struct module *mod) | |
1813 | { | |
1814 | } | |
1815 | ||
d453cded RR |
1816 | void __weak module_arch_freeing_init(struct module *mod) |
1817 | { | |
1818 | } | |
1819 | ||
75676500 | 1820 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1821 | static void free_module(struct module *mod) |
1822 | { | |
7ead8b83 LZ |
1823 | trace_module_free(mod); |
1824 | ||
36b0360d | 1825 | mod_sysfs_teardown(mod); |
1da177e4 | 1826 | |
944a1fa0 RR |
1827 | /* We leave it in list to prevent duplicate loads, but make sure |
1828 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 1829 | mutex_lock(&module_mutex); |
944a1fa0 | 1830 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 1831 | mutex_unlock(&module_mutex); |
944a1fa0 | 1832 | |
b82bab4b JB |
1833 | /* Remove dynamic debug info */ |
1834 | ddebug_remove_module(mod->name); | |
1835 | ||
1da177e4 LT |
1836 | /* Arch-specific cleanup. */ |
1837 | module_arch_cleanup(mod); | |
1838 | ||
1839 | /* Module unload stuff */ | |
1840 | module_unload_free(mod); | |
1841 | ||
e180a6b7 RR |
1842 | /* Free any allocated parameters. */ |
1843 | destroy_params(mod->kp, mod->num_kp); | |
1844 | ||
944a1fa0 RR |
1845 | /* Now we can delete it from the lists */ |
1846 | mutex_lock(&module_mutex); | |
461e34ae MH |
1847 | /* Unlink carefully: kallsyms could be walking list. */ |
1848 | list_del_rcu(&mod->list); | |
0286b5ea | 1849 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 1850 | module_bug_cleanup(mod); |
0286b5ea MH |
1851 | /* Wait for RCU synchronizing before releasing mod->list and buglist. */ |
1852 | synchronize_rcu(); | |
944a1fa0 RR |
1853 | mutex_unlock(&module_mutex); |
1854 | ||
1da177e4 | 1855 | /* This may be NULL, but that's OK */ |
01526ed0 | 1856 | unset_module_init_ro_nx(mod); |
d453cded | 1857 | module_arch_freeing_init(mod); |
be1f221c | 1858 | module_memfree(mod->module_init); |
1da177e4 | 1859 | kfree(mod->args); |
259354de | 1860 | percpu_modfree(mod); |
9f85a4bb | 1861 | |
fbb9ce95 IM |
1862 | /* Free lock-classes: */ |
1863 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1864 | ||
1da177e4 | 1865 | /* Finally, free the core (containing the module structure) */ |
01526ed0 | 1866 | unset_module_core_ro_nx(mod); |
be1f221c | 1867 | module_memfree(mod->module_core); |
eb8cdec4 BS |
1868 | |
1869 | #ifdef CONFIG_MPU | |
1870 | update_protections(current->mm); | |
1871 | #endif | |
1da177e4 LT |
1872 | } |
1873 | ||
1874 | void *__symbol_get(const char *symbol) | |
1875 | { | |
1876 | struct module *owner; | |
414fd31b | 1877 | const struct kernel_symbol *sym; |
1da177e4 | 1878 | |
24da1cbf | 1879 | preempt_disable(); |
414fd31b TA |
1880 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1881 | if (sym && strong_try_module_get(owner)) | |
1882 | sym = NULL; | |
24da1cbf | 1883 | preempt_enable(); |
1da177e4 | 1884 | |
414fd31b | 1885 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1886 | } |
1887 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1888 | ||
eea8b54d AN |
1889 | /* |
1890 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1891 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1892 | * |
1893 | * You must hold the module_mutex. | |
eea8b54d AN |
1894 | */ |
1895 | static int verify_export_symbols(struct module *mod) | |
1896 | { | |
b211104d | 1897 | unsigned int i; |
eea8b54d | 1898 | struct module *owner; |
b211104d RR |
1899 | const struct kernel_symbol *s; |
1900 | struct { | |
1901 | const struct kernel_symbol *sym; | |
1902 | unsigned int num; | |
1903 | } arr[] = { | |
1904 | { mod->syms, mod->num_syms }, | |
1905 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1906 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1907 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1908 | { mod->unused_syms, mod->num_unused_syms }, |
1909 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1910 | #endif |
b211104d | 1911 | }; |
eea8b54d | 1912 | |
b211104d RR |
1913 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1914 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 1915 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 1916 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
1917 | " (owned by %s)\n", |
1918 | mod->name, s->name, module_name(owner)); | |
1919 | return -ENOEXEC; | |
1920 | } | |
eea8b54d | 1921 | } |
b211104d RR |
1922 | } |
1923 | return 0; | |
eea8b54d AN |
1924 | } |
1925 | ||
9a4b9708 | 1926 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
1927 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
1928 | { | |
1929 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
1930 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 1931 | unsigned long secbase; |
49668688 | 1932 | unsigned int i; |
1da177e4 | 1933 | int ret = 0; |
414fd31b | 1934 | const struct kernel_symbol *ksym; |
1da177e4 | 1935 | |
49668688 RR |
1936 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
1937 | const char *name = info->strtab + sym[i].st_name; | |
1938 | ||
1da177e4 LT |
1939 | switch (sym[i].st_shndx) { |
1940 | case SHN_COMMON: | |
80375980 JM |
1941 | /* Ignore common symbols */ |
1942 | if (!strncmp(name, "__gnu_lto", 9)) | |
1943 | break; | |
1944 | ||
1da177e4 LT |
1945 | /* We compiled with -fno-common. These are not |
1946 | supposed to happen. */ | |
5e124169 | 1947 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 1948 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
1949 | mod->name); |
1950 | ret = -ENOEXEC; | |
1951 | break; | |
1952 | ||
1953 | case SHN_ABS: | |
1954 | /* Don't need to do anything */ | |
5e124169 | 1955 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
1956 | (long)sym[i].st_value); |
1957 | break; | |
1958 | ||
1959 | case SHN_UNDEF: | |
49668688 | 1960 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 1961 | /* Ok if resolved. */ |
9bea7f23 | 1962 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 1963 | sym[i].st_value = ksym->value; |
1da177e4 | 1964 | break; |
414fd31b TA |
1965 | } |
1966 | ||
1da177e4 | 1967 | /* Ok if weak. */ |
9bea7f23 | 1968 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
1969 | break; |
1970 | ||
bddb12b3 AM |
1971 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
1972 | mod->name, name, PTR_ERR(ksym)); | |
9bea7f23 | 1973 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
1974 | break; |
1975 | ||
1976 | default: | |
1977 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 1978 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 1979 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 1980 | else |
49668688 | 1981 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
1982 | sym[i].st_value += secbase; |
1983 | break; | |
1984 | } | |
1985 | } | |
1986 | ||
1987 | return ret; | |
1988 | } | |
1989 | ||
49668688 | 1990 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
1991 | { |
1992 | unsigned int i; | |
1993 | int err = 0; | |
1994 | ||
1995 | /* Now do relocations. */ | |
49668688 RR |
1996 | for (i = 1; i < info->hdr->e_shnum; i++) { |
1997 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
1998 | |
1999 | /* Not a valid relocation section? */ | |
49668688 | 2000 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2001 | continue; |
2002 | ||
2003 | /* Don't bother with non-allocated sections */ | |
49668688 | 2004 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2005 | continue; |
2006 | ||
49668688 RR |
2007 | if (info->sechdrs[i].sh_type == SHT_REL) |
2008 | err = apply_relocate(info->sechdrs, info->strtab, | |
2009 | info->index.sym, i, mod); | |
2010 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2011 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2012 | info->index.sym, i, mod); | |
22e268eb RR |
2013 | if (err < 0) |
2014 | break; | |
2015 | } | |
2016 | return err; | |
2017 | } | |
2018 | ||
088af9a6 HD |
2019 | /* Additional bytes needed by arch in front of individual sections */ |
2020 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2021 | unsigned int section) | |
2022 | { | |
2023 | /* default implementation just returns zero */ | |
2024 | return 0; | |
2025 | } | |
2026 | ||
1da177e4 | 2027 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2028 | static long get_offset(struct module *mod, unsigned int *size, |
2029 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2030 | { |
2031 | long ret; | |
2032 | ||
088af9a6 | 2033 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2034 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2035 | *size = ret + sechdr->sh_size; | |
2036 | return ret; | |
2037 | } | |
2038 | ||
2039 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2040 | might -- code, read-only data, read-write data, small data. Tally | |
2041 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2042 | belongs in init. */ | |
49668688 | 2043 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2044 | { |
2045 | static unsigned long const masks[][2] = { | |
2046 | /* NOTE: all executable code must be the first section | |
2047 | * in this array; otherwise modify the text_size | |
2048 | * finder in the two loops below */ | |
2049 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2050 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
2051 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2052 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2053 | }; | |
2054 | unsigned int m, i; | |
2055 | ||
49668688 RR |
2056 | for (i = 0; i < info->hdr->e_shnum; i++) |
2057 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2058 | |
5e124169 | 2059 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2060 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2061 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2062 | Elf_Shdr *s = &info->sechdrs[i]; | |
2063 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2064 | |
2065 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2066 | || (s->sh_flags & masks[m][1]) | |
2067 | || s->sh_entsize != ~0UL | |
49668688 | 2068 | || strstarts(sname, ".init")) |
1da177e4 | 2069 | continue; |
088af9a6 | 2070 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
5e124169 | 2071 | pr_debug("\t%s\n", sname); |
1da177e4 | 2072 | } |
84e1c6bb | 2073 | switch (m) { |
2074 | case 0: /* executable */ | |
2075 | mod->core_size = debug_align(mod->core_size); | |
1da177e4 | 2076 | mod->core_text_size = mod->core_size; |
84e1c6bb | 2077 | break; |
2078 | case 1: /* RO: text and ro-data */ | |
2079 | mod->core_size = debug_align(mod->core_size); | |
2080 | mod->core_ro_size = mod->core_size; | |
2081 | break; | |
2082 | case 3: /* whole core */ | |
2083 | mod->core_size = debug_align(mod->core_size); | |
2084 | break; | |
2085 | } | |
1da177e4 LT |
2086 | } |
2087 | ||
5e124169 | 2088 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2089 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2090 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2091 | Elf_Shdr *s = &info->sechdrs[i]; | |
2092 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2093 | |
2094 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2095 | || (s->sh_flags & masks[m][1]) | |
2096 | || s->sh_entsize != ~0UL | |
49668688 | 2097 | || !strstarts(sname, ".init")) |
1da177e4 | 2098 | continue; |
088af9a6 | 2099 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 | 2100 | | INIT_OFFSET_MASK); |
5e124169 | 2101 | pr_debug("\t%s\n", sname); |
1da177e4 | 2102 | } |
84e1c6bb | 2103 | switch (m) { |
2104 | case 0: /* executable */ | |
2105 | mod->init_size = debug_align(mod->init_size); | |
1da177e4 | 2106 | mod->init_text_size = mod->init_size; |
84e1c6bb | 2107 | break; |
2108 | case 1: /* RO: text and ro-data */ | |
2109 | mod->init_size = debug_align(mod->init_size); | |
2110 | mod->init_ro_size = mod->init_size; | |
2111 | break; | |
2112 | case 3: /* whole init */ | |
2113 | mod->init_size = debug_align(mod->init_size); | |
2114 | break; | |
2115 | } | |
1da177e4 LT |
2116 | } |
2117 | } | |
2118 | ||
1da177e4 LT |
2119 | static void set_license(struct module *mod, const char *license) |
2120 | { | |
2121 | if (!license) | |
2122 | license = "unspecified"; | |
2123 | ||
fa3ba2e8 | 2124 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2125 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2126 | pr_warn("%s: module license '%s' taints kernel.\n", |
2127 | mod->name, license); | |
373d4d09 RR |
2128 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2129 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2130 | } |
2131 | } | |
2132 | ||
2133 | /* Parse tag=value strings from .modinfo section */ | |
2134 | static char *next_string(char *string, unsigned long *secsize) | |
2135 | { | |
2136 | /* Skip non-zero chars */ | |
2137 | while (string[0]) { | |
2138 | string++; | |
2139 | if ((*secsize)-- <= 1) | |
2140 | return NULL; | |
2141 | } | |
2142 | ||
2143 | /* Skip any zero padding. */ | |
2144 | while (!string[0]) { | |
2145 | string++; | |
2146 | if ((*secsize)-- <= 1) | |
2147 | return NULL; | |
2148 | } | |
2149 | return string; | |
2150 | } | |
2151 | ||
49668688 | 2152 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2153 | { |
2154 | char *p; | |
2155 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2156 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2157 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2158 | |
49668688 | 2159 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2160 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2161 | return p + taglen + 1; | |
2162 | } | |
2163 | return NULL; | |
2164 | } | |
2165 | ||
49668688 | 2166 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2167 | { |
2168 | struct module_attribute *attr; | |
2169 | int i; | |
2170 | ||
2171 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2172 | if (attr->setup) | |
49668688 | 2173 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2174 | } |
2175 | } | |
c988d2b2 | 2176 | |
a263f776 RR |
2177 | static void free_modinfo(struct module *mod) |
2178 | { | |
2179 | struct module_attribute *attr; | |
2180 | int i; | |
2181 | ||
2182 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2183 | if (attr->free) | |
2184 | attr->free(mod); | |
2185 | } | |
2186 | } | |
2187 | ||
1da177e4 | 2188 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2189 | |
2190 | /* lookup symbol in given range of kernel_symbols */ | |
2191 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2192 | const struct kernel_symbol *start, | |
2193 | const struct kernel_symbol *stop) | |
2194 | { | |
9d63487f AIB |
2195 | return bsearch(name, start, stop - start, |
2196 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2197 | } |
2198 | ||
ca4787b7 TA |
2199 | static int is_exported(const char *name, unsigned long value, |
2200 | const struct module *mod) | |
1da177e4 | 2201 | { |
ca4787b7 TA |
2202 | const struct kernel_symbol *ks; |
2203 | if (!mod) | |
2204 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2205 | else |
ca4787b7 TA |
2206 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2207 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2208 | } |
2209 | ||
2210 | /* As per nm */ | |
eded41c1 | 2211 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2212 | { |
eded41c1 RR |
2213 | const Elf_Shdr *sechdrs = info->sechdrs; |
2214 | ||
1da177e4 LT |
2215 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2216 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2217 | return 'v'; | |
2218 | else | |
2219 | return 'w'; | |
2220 | } | |
2221 | if (sym->st_shndx == SHN_UNDEF) | |
2222 | return 'U'; | |
2223 | if (sym->st_shndx == SHN_ABS) | |
2224 | return 'a'; | |
2225 | if (sym->st_shndx >= SHN_LORESERVE) | |
2226 | return '?'; | |
2227 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2228 | return 't'; | |
2229 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2230 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2231 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2232 | return 'r'; | |
2233 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2234 | return 'g'; | |
2235 | else | |
2236 | return 'd'; | |
2237 | } | |
2238 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2239 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2240 | return 's'; | |
2241 | else | |
2242 | return 'b'; | |
2243 | } | |
eded41c1 RR |
2244 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2245 | ".debug")) { | |
1da177e4 | 2246 | return 'n'; |
eded41c1 | 2247 | } |
1da177e4 LT |
2248 | return '?'; |
2249 | } | |
2250 | ||
4a496226 | 2251 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
6da0b565 | 2252 | unsigned int shnum) |
4a496226 JB |
2253 | { |
2254 | const Elf_Shdr *sec; | |
2255 | ||
2256 | if (src->st_shndx == SHN_UNDEF | |
2257 | || src->st_shndx >= shnum | |
2258 | || !src->st_name) | |
2259 | return false; | |
2260 | ||
2261 | sec = sechdrs + src->st_shndx; | |
2262 | if (!(sec->sh_flags & SHF_ALLOC) | |
2263 | #ifndef CONFIG_KALLSYMS_ALL | |
2264 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2265 | #endif | |
2266 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2267 | return false; | |
2268 | ||
2269 | return true; | |
2270 | } | |
2271 | ||
48fd1188 KC |
2272 | /* |
2273 | * We only allocate and copy the strings needed by the parts of symtab | |
2274 | * we keep. This is simple, but has the effect of making multiple | |
2275 | * copies of duplicates. We could be more sophisticated, see | |
2276 | * linux-kernel thread starting with | |
2277 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2278 | */ | |
49668688 | 2279 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2280 | { |
49668688 RR |
2281 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2282 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2283 | const Elf_Sym *src; |
54523ec7 | 2284 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2285 | |
2286 | /* Put symbol section at end of init part of module. */ | |
2287 | symsect->sh_flags |= SHF_ALLOC; | |
2288 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
49668688 | 2289 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2290 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2291 | |
49668688 | 2292 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2293 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2294 | |
48fd1188 | 2295 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 RR |
2296 | for (ndst = i = 0; i < nsrc; i++) { |
2297 | if (i == 0 || | |
2298 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2299 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; | |
48fd1188 | 2300 | ndst++; |
554bdfe5 | 2301 | } |
59ef28b1 | 2302 | } |
4a496226 JB |
2303 | |
2304 | /* Append room for core symbols at end of core part. */ | |
49668688 | 2305 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
48fd1188 KC |
2306 | info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
2307 | mod->core_size += strtab_size; | |
4a496226 | 2308 | |
554bdfe5 JB |
2309 | /* Put string table section at end of init part of module. */ |
2310 | strsect->sh_flags |= SHF_ALLOC; | |
2311 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
49668688 | 2312 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2313 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
4a496226 JB |
2314 | } |
2315 | ||
811d66a0 | 2316 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2317 | { |
4a496226 JB |
2318 | unsigned int i, ndst; |
2319 | const Elf_Sym *src; | |
2320 | Elf_Sym *dst; | |
554bdfe5 | 2321 | char *s; |
eded41c1 | 2322 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2323 | |
eded41c1 RR |
2324 | mod->symtab = (void *)symsec->sh_addr; |
2325 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae RR |
2326 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2327 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2328 | |
2329 | /* Set types up while we still have access to sections. */ | |
2330 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2331 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2332 | |
d913188c | 2333 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
48fd1188 | 2334 | mod->core_strtab = s = mod->module_core + info->stroffs; |
4a496226 | 2335 | src = mod->symtab; |
59ef28b1 RR |
2336 | for (ndst = i = 0; i < mod->num_symtab; i++) { |
2337 | if (i == 0 || | |
2338 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2339 | dst[ndst] = src[i]; | |
2340 | dst[ndst++].st_name = s - mod->core_strtab; | |
2341 | s += strlcpy(s, &mod->strtab[src[i].st_name], | |
2342 | KSYM_NAME_LEN) + 1; | |
2343 | } | |
4a496226 JB |
2344 | } |
2345 | mod->core_num_syms = ndst; | |
1da177e4 LT |
2346 | } |
2347 | #else | |
49668688 | 2348 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2349 | { |
2350 | } | |
3ae91c21 | 2351 | |
abbce906 | 2352 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2353 | { |
2354 | } | |
2355 | #endif /* CONFIG_KALLSYMS */ | |
2356 | ||
e9d376f0 | 2357 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2358 | { |
811d66a0 RR |
2359 | if (!debug) |
2360 | return; | |
e9d376f0 JB |
2361 | #ifdef CONFIG_DYNAMIC_DEBUG |
2362 | if (ddebug_add_module(debug, num, debug->modname)) | |
bddb12b3 AM |
2363 | pr_err("dynamic debug error adding module: %s\n", |
2364 | debug->modname); | |
e9d376f0 | 2365 | #endif |
5e458cc0 | 2366 | } |
346e15be | 2367 | |
ff49d74a YS |
2368 | static void dynamic_debug_remove(struct _ddebug *debug) |
2369 | { | |
2370 | if (debug) | |
2371 | ddebug_remove_module(debug->modname); | |
2372 | } | |
2373 | ||
74e08fcf JB |
2374 | void * __weak module_alloc(unsigned long size) |
2375 | { | |
82fab442 | 2376 | return vmalloc_exec(size); |
74e08fcf JB |
2377 | } |
2378 | ||
3a642e99 RR |
2379 | static void *module_alloc_update_bounds(unsigned long size) |
2380 | { | |
2381 | void *ret = module_alloc(size); | |
2382 | ||
2383 | if (ret) { | |
75676500 | 2384 | mutex_lock(&module_mutex); |
3a642e99 RR |
2385 | /* Update module bounds. */ |
2386 | if ((unsigned long)ret < module_addr_min) | |
2387 | module_addr_min = (unsigned long)ret; | |
2388 | if ((unsigned long)ret + size > module_addr_max) | |
2389 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2390 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2391 | } |
2392 | return ret; | |
2393 | } | |
2394 | ||
4f2294b6 | 2395 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2396 | static void kmemleak_load_module(const struct module *mod, |
2397 | const struct load_info *info) | |
4f2294b6 CM |
2398 | { |
2399 | unsigned int i; | |
2400 | ||
2401 | /* only scan the sections containing data */ | |
c017b4be | 2402 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2403 | |
49668688 | 2404 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2405 | /* Scan all writable sections that's not executable */ |
2406 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2407 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2408 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2409 | continue; |
2410 | ||
49668688 RR |
2411 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2412 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2413 | } |
2414 | } | |
2415 | #else | |
49668688 RR |
2416 | static inline void kmemleak_load_module(const struct module *mod, |
2417 | const struct load_info *info) | |
4f2294b6 CM |
2418 | { |
2419 | } | |
2420 | #endif | |
2421 | ||
106a4ee2 | 2422 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2423 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2424 | { |
2425 | int err = -ENOKEY; | |
34e1169d KC |
2426 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2427 | const void *mod = info->hdr; | |
caabe240 | 2428 | |
34e1169d KC |
2429 | if (info->len > markerlen && |
2430 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { | |
caabe240 | 2431 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2432 | info->len -= markerlen; |
2433 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2434 | } |
2435 | ||
2436 | if (!err) { | |
2437 | info->sig_ok = true; | |
2438 | return 0; | |
2439 | } | |
2440 | ||
2441 | /* Not having a signature is only an error if we're strict. */ | |
2442 | if (err == -ENOKEY && !sig_enforce) | |
2443 | err = 0; | |
2444 | ||
2445 | return err; | |
2446 | } | |
2447 | #else /* !CONFIG_MODULE_SIG */ | |
34e1169d | 2448 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2449 | { |
2450 | return 0; | |
2451 | } | |
2452 | #endif /* !CONFIG_MODULE_SIG */ | |
2453 | ||
34e1169d KC |
2454 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2455 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2456 | { |
34e1169d KC |
2457 | if (info->len < sizeof(*(info->hdr))) |
2458 | return -ENOEXEC; | |
2459 | ||
2460 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2461 | || info->hdr->e_type != ET_REL | |
2462 | || !elf_check_arch(info->hdr) | |
2463 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2464 | return -ENOEXEC; | |
2465 | ||
2466 | if (info->hdr->e_shoff >= info->len | |
2467 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2468 | info->len - info->hdr->e_shoff)) | |
2469 | return -ENOEXEC; | |
40dd2560 | 2470 | |
34e1169d KC |
2471 | return 0; |
2472 | } | |
2473 | ||
2474 | /* Sets info->hdr and info->len. */ | |
2475 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2476 | struct load_info *info) | |
40dd2560 RR |
2477 | { |
2478 | int err; | |
40dd2560 | 2479 | |
34e1169d KC |
2480 | info->len = len; |
2481 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2482 | return -ENOEXEC; |
2483 | ||
2e72d51b KC |
2484 | err = security_kernel_module_from_file(NULL); |
2485 | if (err) | |
2486 | return err; | |
2487 | ||
40dd2560 | 2488 | /* Suck in entire file: we'll want most of it. */ |
34e1169d KC |
2489 | info->hdr = vmalloc(info->len); |
2490 | if (!info->hdr) | |
40dd2560 RR |
2491 | return -ENOMEM; |
2492 | ||
34e1169d KC |
2493 | if (copy_from_user(info->hdr, umod, info->len) != 0) { |
2494 | vfree(info->hdr); | |
2495 | return -EFAULT; | |
40dd2560 RR |
2496 | } |
2497 | ||
34e1169d KC |
2498 | return 0; |
2499 | } | |
2500 | ||
2501 | /* Sets info->hdr and info->len. */ | |
2502 | static int copy_module_from_fd(int fd, struct load_info *info) | |
2503 | { | |
a2e0578b | 2504 | struct fd f = fdget(fd); |
34e1169d KC |
2505 | int err; |
2506 | struct kstat stat; | |
2507 | loff_t pos; | |
2508 | ssize_t bytes = 0; | |
2509 | ||
a2e0578b | 2510 | if (!f.file) |
34e1169d KC |
2511 | return -ENOEXEC; |
2512 | ||
a2e0578b | 2513 | err = security_kernel_module_from_file(f.file); |
106a4ee2 | 2514 | if (err) |
2e72d51b | 2515 | goto out; |
106a4ee2 | 2516 | |
a2e0578b | 2517 | err = vfs_getattr(&f.file->f_path, &stat); |
106a4ee2 | 2518 | if (err) |
34e1169d | 2519 | goto out; |
40dd2560 | 2520 | |
34e1169d KC |
2521 | if (stat.size > INT_MAX) { |
2522 | err = -EFBIG; | |
2523 | goto out; | |
40dd2560 | 2524 | } |
52441fa8 SL |
2525 | |
2526 | /* Don't hand 0 to vmalloc, it whines. */ | |
2527 | if (stat.size == 0) { | |
2528 | err = -EINVAL; | |
2529 | goto out; | |
2530 | } | |
2531 | ||
34e1169d KC |
2532 | info->hdr = vmalloc(stat.size); |
2533 | if (!info->hdr) { | |
2534 | err = -ENOMEM; | |
2535 | goto out; | |
40dd2560 | 2536 | } |
d913188c | 2537 | |
34e1169d KC |
2538 | pos = 0; |
2539 | while (pos < stat.size) { | |
a2e0578b | 2540 | bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos, |
34e1169d KC |
2541 | stat.size - pos); |
2542 | if (bytes < 0) { | |
2543 | vfree(info->hdr); | |
2544 | err = bytes; | |
2545 | goto out; | |
2546 | } | |
2547 | if (bytes == 0) | |
2548 | break; | |
2549 | pos += bytes; | |
2550 | } | |
2551 | info->len = pos; | |
40dd2560 | 2552 | |
34e1169d | 2553 | out: |
a2e0578b | 2554 | fdput(f); |
40dd2560 RR |
2555 | return err; |
2556 | } | |
2557 | ||
d913188c RR |
2558 | static void free_copy(struct load_info *info) |
2559 | { | |
d913188c RR |
2560 | vfree(info->hdr); |
2561 | } | |
2562 | ||
2f3238ae | 2563 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2564 | { |
2565 | unsigned int i; | |
2566 | ||
2567 | /* This should always be true, but let's be sure. */ | |
2568 | info->sechdrs[0].sh_addr = 0; | |
2569 | ||
2570 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2571 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2572 | if (shdr->sh_type != SHT_NOBITS | |
2573 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2574 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2575 | return -ENOEXEC; |
2576 | } | |
2577 | ||
2578 | /* Mark all sections sh_addr with their address in the | |
2579 | temporary image. */ | |
2580 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2581 | ||
2582 | #ifndef CONFIG_MODULE_UNLOAD | |
2583 | /* Don't load .exit sections */ | |
2584 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2585 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2586 | #endif | |
8b5f61a7 | 2587 | } |
d6df72a0 RR |
2588 | |
2589 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2590 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2591 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2592 | else | |
2593 | info->index.vers = find_sec(info, "__versions"); | |
49668688 | 2594 | info->index.info = find_sec(info, ".modinfo"); |
d6df72a0 RR |
2595 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2596 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2597 | return 0; |
2598 | } | |
2599 | ||
3264d3f9 LT |
2600 | /* |
2601 | * Set up our basic convenience variables (pointers to section headers, | |
2602 | * search for module section index etc), and do some basic section | |
2603 | * verification. | |
2604 | * | |
2605 | * Return the temporary module pointer (we'll replace it with the final | |
2606 | * one when we move the module sections around). | |
2607 | */ | |
2f3238ae | 2608 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2609 | { |
2610 | unsigned int i; | |
8b5f61a7 | 2611 | int err; |
3264d3f9 LT |
2612 | struct module *mod; |
2613 | ||
2614 | /* Set up the convenience variables */ | |
2615 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2616 | info->secstrings = (void *)info->hdr |
2617 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2618 | |
2f3238ae | 2619 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2620 | if (err) |
2621 | return ERR_PTR(err); | |
3264d3f9 | 2622 | |
8b5f61a7 RR |
2623 | /* Find internal symbols and strings. */ |
2624 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2625 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2626 | info->index.sym = i; | |
2627 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2628 | info->strtab = (char *)info->hdr |
2629 | + info->sechdrs[info->index.str].sh_offset; | |
2630 | break; | |
3264d3f9 | 2631 | } |
3264d3f9 LT |
2632 | } |
2633 | ||
49668688 | 2634 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2635 | if (!info->index.mod) { |
bddb12b3 | 2636 | pr_warn("No module found in object\n"); |
3264d3f9 LT |
2637 | return ERR_PTR(-ENOEXEC); |
2638 | } | |
2639 | /* This is temporary: point mod into copy of data. */ | |
2640 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2641 | ||
2642 | if (info->index.sym == 0) { | |
bddb12b3 | 2643 | pr_warn("%s: module has no symbols (stripped?)\n", mod->name); |
3264d3f9 LT |
2644 | return ERR_PTR(-ENOEXEC); |
2645 | } | |
2646 | ||
49668688 | 2647 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2648 | |
3264d3f9 LT |
2649 | /* Check module struct version now, before we try to use module. */ |
2650 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2651 | return ERR_PTR(-ENOEXEC); | |
2652 | ||
2653 | return mod; | |
3264d3f9 LT |
2654 | } |
2655 | ||
2f3238ae | 2656 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2657 | { |
49668688 | 2658 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2659 | int err; |
2660 | ||
2f3238ae RR |
2661 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2662 | modmagic = NULL; | |
2663 | ||
40dd2560 RR |
2664 | /* This is allowed: modprobe --force will invalidate it. */ |
2665 | if (!modmagic) { | |
2666 | err = try_to_force_load(mod, "bad vermagic"); | |
2667 | if (err) | |
2668 | return err; | |
49668688 | 2669 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 2670 | pr_err("%s: version magic '%s' should be '%s'\n", |
40dd2560 RR |
2671 | mod->name, modmagic, vermagic); |
2672 | return -ENOEXEC; | |
2673 | } | |
2674 | ||
2449b8ba | 2675 | if (!get_modinfo(info, "intree")) |
373d4d09 | 2676 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
2449b8ba | 2677 | |
49668688 | 2678 | if (get_modinfo(info, "staging")) { |
373d4d09 | 2679 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
2680 | pr_warn("%s: module is from the staging directory, the quality " |
2681 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 2682 | } |
22e268eb RR |
2683 | |
2684 | /* Set up license info based on the info section */ | |
49668688 | 2685 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2686 | |
40dd2560 RR |
2687 | return 0; |
2688 | } | |
2689 | ||
eb3057df | 2690 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2691 | { |
49668688 | 2692 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2693 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2694 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2695 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2696 | mod->crcs = section_addr(info, "__kcrctab"); |
2697 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2698 | sizeof(*mod->gpl_syms), |
2699 | &mod->num_gpl_syms); | |
49668688 RR |
2700 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2701 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2702 | "__ksymtab_gpl_future", |
2703 | sizeof(*mod->gpl_future_syms), | |
2704 | &mod->num_gpl_future_syms); | |
49668688 | 2705 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2706 | |
2707 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2708 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2709 | sizeof(*mod->unused_syms), |
2710 | &mod->num_unused_syms); | |
49668688 RR |
2711 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2712 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2713 | sizeof(*mod->unused_gpl_syms), |
2714 | &mod->num_unused_gpl_syms); | |
49668688 | 2715 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2716 | #endif |
2717 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2718 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 2719 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
2720 | if (!mod->ctors) |
2721 | mod->ctors = section_objs(info, ".init_array", | |
2722 | sizeof(*mod->ctors), &mod->num_ctors); | |
2723 | else if (find_sec(info, ".init_array")) { | |
2724 | /* | |
2725 | * This shouldn't happen with same compiler and binutils | |
2726 | * building all parts of the module. | |
2727 | */ | |
6da0b565 | 2728 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
2729 | mod->name); |
2730 | return -EINVAL; | |
2731 | } | |
f91a13bb LT |
2732 | #endif |
2733 | ||
2734 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2735 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2736 | sizeof(*mod->tracepoints_ptrs), | |
2737 | &mod->num_tracepoints); | |
f91a13bb | 2738 | #endif |
bf5438fc JB |
2739 | #ifdef HAVE_JUMP_LABEL |
2740 | mod->jump_entries = section_objs(info, "__jump_table", | |
2741 | sizeof(*mod->jump_entries), | |
2742 | &mod->num_jump_entries); | |
2743 | #endif | |
f91a13bb | 2744 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2745 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2746 | sizeof(*mod->trace_events), |
2747 | &mod->num_trace_events); | |
f91a13bb | 2748 | #endif |
13b9b6e7 SR |
2749 | #ifdef CONFIG_TRACING |
2750 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2751 | sizeof(*mod->trace_bprintk_fmt_start), | |
2752 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 2753 | #endif |
f91a13bb LT |
2754 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2755 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2756 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2757 | sizeof(*mod->ftrace_callsites), |
2758 | &mod->num_ftrace_callsites); | |
2759 | #endif | |
22e268eb | 2760 | |
811d66a0 RR |
2761 | mod->extable = section_objs(info, "__ex_table", |
2762 | sizeof(*mod->extable), &mod->num_exentries); | |
2763 | ||
49668688 | 2764 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 2765 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
2766 | |
2767 | info->debug = section_objs(info, "__verbose", | |
2768 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
2769 | |
2770 | return 0; | |
f91a13bb LT |
2771 | } |
2772 | ||
49668688 | 2773 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2774 | { |
2775 | int i; | |
2776 | void *ptr; | |
2777 | ||
2778 | /* Do the allocs. */ | |
2779 | ptr = module_alloc_update_bounds(mod->core_size); | |
2780 | /* | |
2781 | * The pointer to this block is stored in the module structure | |
2782 | * which is inside the block. Just mark it as not being a | |
2783 | * leak. | |
2784 | */ | |
2785 | kmemleak_not_leak(ptr); | |
2786 | if (!ptr) | |
d913188c | 2787 | return -ENOMEM; |
65b8a9b4 LT |
2788 | |
2789 | memset(ptr, 0, mod->core_size); | |
2790 | mod->module_core = ptr; | |
2791 | ||
82fab442 RR |
2792 | if (mod->init_size) { |
2793 | ptr = module_alloc_update_bounds(mod->init_size); | |
2794 | /* | |
2795 | * The pointer to this block is stored in the module structure | |
2796 | * which is inside the block. This block doesn't need to be | |
2797 | * scanned as it contains data and code that will be freed | |
2798 | * after the module is initialized. | |
2799 | */ | |
2800 | kmemleak_ignore(ptr); | |
2801 | if (!ptr) { | |
be1f221c | 2802 | module_memfree(mod->module_core); |
82fab442 RR |
2803 | return -ENOMEM; |
2804 | } | |
2805 | memset(ptr, 0, mod->init_size); | |
2806 | mod->module_init = ptr; | |
2807 | } else | |
2808 | mod->module_init = NULL; | |
65b8a9b4 LT |
2809 | |
2810 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 2811 | pr_debug("final section addresses:\n"); |
49668688 | 2812 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2813 | void *dest; |
49668688 | 2814 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2815 | |
49668688 | 2816 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2817 | continue; |
2818 | ||
49668688 | 2819 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
65b8a9b4 | 2820 | dest = mod->module_init |
49668688 | 2821 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 2822 | else |
49668688 | 2823 | dest = mod->module_core + shdr->sh_entsize; |
65b8a9b4 | 2824 | |
49668688 RR |
2825 | if (shdr->sh_type != SHT_NOBITS) |
2826 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 2827 | /* Update sh_addr to point to copy in image. */ |
49668688 | 2828 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
2829 | pr_debug("\t0x%lx %s\n", |
2830 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 2831 | } |
d913188c RR |
2832 | |
2833 | return 0; | |
65b8a9b4 LT |
2834 | } |
2835 | ||
49668688 | 2836 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
2837 | { |
2838 | /* | |
2839 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2840 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2841 | * using GPL-only symbols it needs. | |
2842 | */ | |
2843 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 2844 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
2845 | |
2846 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2847 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
2848 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2849 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 2850 | |
c99af375 MG |
2851 | /* lve claims to be GPL but upstream won't provide source */ |
2852 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
2853 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2854 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 2855 | |
22e268eb RR |
2856 | #ifdef CONFIG_MODVERSIONS |
2857 | if ((mod->num_syms && !mod->crcs) | |
2858 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2859 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
2860 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2861 | || (mod->num_unused_syms && !mod->unused_crcs) | |
2862 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
2863 | #endif | |
2864 | ) { | |
2865 | return try_to_force_load(mod, | |
2866 | "no versions for exported symbols"); | |
2867 | } | |
2868 | #endif | |
2869 | return 0; | |
2870 | } | |
2871 | ||
2872 | static void flush_module_icache(const struct module *mod) | |
2873 | { | |
2874 | mm_segment_t old_fs; | |
2875 | ||
2876 | /* flush the icache in correct context */ | |
2877 | old_fs = get_fs(); | |
2878 | set_fs(KERNEL_DS); | |
2879 | ||
2880 | /* | |
2881 | * Flush the instruction cache, since we've played with text. | |
2882 | * Do it before processing of module parameters, so the module | |
2883 | * can provide parameter accessor functions of its own. | |
2884 | */ | |
2885 | if (mod->module_init) | |
2886 | flush_icache_range((unsigned long)mod->module_init, | |
2887 | (unsigned long)mod->module_init | |
2888 | + mod->init_size); | |
2889 | flush_icache_range((unsigned long)mod->module_core, | |
2890 | (unsigned long)mod->module_core + mod->core_size); | |
2891 | ||
2892 | set_fs(old_fs); | |
2893 | } | |
2894 | ||
74e08fcf JB |
2895 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
2896 | Elf_Shdr *sechdrs, | |
2897 | char *secstrings, | |
2898 | struct module *mod) | |
2899 | { | |
2900 | return 0; | |
2901 | } | |
2902 | ||
2f3238ae | 2903 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 2904 | { |
d913188c | 2905 | /* Module within temporary copy. */ |
1da177e4 | 2906 | struct module *mod; |
d913188c | 2907 | int err; |
3ae91c21 | 2908 | |
2f3238ae | 2909 | mod = setup_load_info(info, flags); |
d913188c RR |
2910 | if (IS_ERR(mod)) |
2911 | return mod; | |
1da177e4 | 2912 | |
2f3238ae | 2913 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
2914 | if (err) |
2915 | return ERR_PTR(err); | |
1da177e4 | 2916 | |
1da177e4 | 2917 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
2918 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
2919 | info->secstrings, mod); | |
1da177e4 | 2920 | if (err < 0) |
8d8022e8 | 2921 | return ERR_PTR(err); |
1da177e4 | 2922 | |
8d8022e8 RR |
2923 | /* We will do a special allocation for per-cpu sections later. */ |
2924 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 LT |
2925 | |
2926 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2927 | this is done generically; there doesn't appear to be any | |
2928 | special cases for the architectures. */ | |
49668688 | 2929 | layout_sections(mod, info); |
49668688 | 2930 | layout_symtab(mod, info); |
1da177e4 | 2931 | |
65b8a9b4 | 2932 | /* Allocate and move to the final place */ |
49668688 | 2933 | err = move_module(mod, info); |
d913188c | 2934 | if (err) |
8d8022e8 | 2935 | return ERR_PTR(err); |
d913188c RR |
2936 | |
2937 | /* Module has been copied to its final place now: return it. */ | |
2938 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 2939 | kmemleak_load_module(mod, info); |
d913188c | 2940 | return mod; |
d913188c RR |
2941 | } |
2942 | ||
2943 | /* mod is no longer valid after this! */ | |
2944 | static void module_deallocate(struct module *mod, struct load_info *info) | |
2945 | { | |
d913188c | 2946 | percpu_modfree(mod); |
d453cded | 2947 | module_arch_freeing_init(mod); |
be1f221c RR |
2948 | module_memfree(mod->module_init); |
2949 | module_memfree(mod->module_core); | |
d913188c RR |
2950 | } |
2951 | ||
74e08fcf JB |
2952 | int __weak module_finalize(const Elf_Ehdr *hdr, |
2953 | const Elf_Shdr *sechdrs, | |
2954 | struct module *me) | |
2955 | { | |
2956 | return 0; | |
2957 | } | |
2958 | ||
811d66a0 RR |
2959 | static int post_relocation(struct module *mod, const struct load_info *info) |
2960 | { | |
51f3d0f4 | 2961 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
2962 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
2963 | ||
2964 | /* Copy relocated percpu area over. */ | |
2965 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
2966 | info->sechdrs[info->index.pcpu].sh_size); | |
2967 | ||
51f3d0f4 | 2968 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
2969 | add_kallsyms(mod, info); |
2970 | ||
2971 | /* Arch-specific module finalizing. */ | |
2972 | return module_finalize(info->hdr, info->sechdrs, mod); | |
2973 | } | |
2974 | ||
9bb9c3be RR |
2975 | /* Is this module of this name done loading? No locks held. */ |
2976 | static bool finished_loading(const char *name) | |
2977 | { | |
2978 | struct module *mod; | |
2979 | bool ret; | |
2980 | ||
2981 | mutex_lock(&module_mutex); | |
4f6de4d5 | 2982 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
2983 | ret = !mod || mod->state == MODULE_STATE_LIVE |
2984 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
2985 | mutex_unlock(&module_mutex); |
2986 | ||
2987 | return ret; | |
2988 | } | |
2989 | ||
34e1169d KC |
2990 | /* Call module constructors. */ |
2991 | static void do_mod_ctors(struct module *mod) | |
2992 | { | |
2993 | #ifdef CONFIG_CONSTRUCTORS | |
2994 | unsigned long i; | |
2995 | ||
2996 | for (i = 0; i < mod->num_ctors; i++) | |
2997 | mod->ctors[i](); | |
2998 | #endif | |
2999 | } | |
3000 | ||
c7496379 RR |
3001 | /* For freeing module_init on success, in case kallsyms traversing */ |
3002 | struct mod_initfree { | |
3003 | struct rcu_head rcu; | |
3004 | void *module_init; | |
3005 | }; | |
3006 | ||
3007 | static void do_free_init(struct rcu_head *head) | |
3008 | { | |
3009 | struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); | |
3010 | module_memfree(m->module_init); | |
3011 | kfree(m); | |
3012 | } | |
3013 | ||
34e1169d KC |
3014 | /* This is where the real work happens */ |
3015 | static int do_init_module(struct module *mod) | |
3016 | { | |
3017 | int ret = 0; | |
c7496379 RR |
3018 | struct mod_initfree *freeinit; |
3019 | ||
3020 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3021 | if (!freeinit) { | |
3022 | ret = -ENOMEM; | |
3023 | goto fail; | |
3024 | } | |
3025 | freeinit->module_init = mod->module_init; | |
34e1169d | 3026 | |
774a1221 TH |
3027 | /* |
3028 | * We want to find out whether @mod uses async during init. Clear | |
3029 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3030 | */ | |
3031 | current->flags &= ~PF_USED_ASYNC; | |
3032 | ||
34e1169d KC |
3033 | do_mod_ctors(mod); |
3034 | /* Start the module */ | |
3035 | if (mod->init != NULL) | |
3036 | ret = do_one_initcall(mod->init); | |
3037 | if (ret < 0) { | |
c7496379 | 3038 | goto fail_free_freeinit; |
34e1169d KC |
3039 | } |
3040 | if (ret > 0) { | |
bddb12b3 AM |
3041 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3042 | "follow 0/-E convention\n" | |
3043 | "%s: loading module anyway...\n", | |
3044 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3045 | dump_stack(); |
3046 | } | |
3047 | ||
3048 | /* Now it's a first class citizen! */ | |
3049 | mod->state = MODULE_STATE_LIVE; | |
3050 | blocking_notifier_call_chain(&module_notify_list, | |
3051 | MODULE_STATE_LIVE, mod); | |
3052 | ||
774a1221 TH |
3053 | /* |
3054 | * We need to finish all async code before the module init sequence | |
3055 | * is done. This has potential to deadlock. For example, a newly | |
3056 | * detected block device can trigger request_module() of the | |
3057 | * default iosched from async probing task. Once userland helper | |
3058 | * reaches here, async_synchronize_full() will wait on the async | |
3059 | * task waiting on request_module() and deadlock. | |
3060 | * | |
3061 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3062 | * iff module init queued any async jobs. This isn't a full | |
3063 | * solution as it will deadlock the same if module loading from | |
3064 | * async jobs nests more than once; however, due to the various | |
3065 | * constraints, this hack seems to be the best option for now. | |
3066 | * Please refer to the following thread for details. | |
3067 | * | |
3068 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3069 | */ | |
3070 | if (current->flags & PF_USED_ASYNC) | |
3071 | async_synchronize_full(); | |
34e1169d KC |
3072 | |
3073 | mutex_lock(&module_mutex); | |
3074 | /* Drop initial reference. */ | |
3075 | module_put(mod); | |
3076 | trim_init_extable(mod); | |
3077 | #ifdef CONFIG_KALLSYMS | |
3078 | mod->num_symtab = mod->core_num_syms; | |
3079 | mod->symtab = mod->core_symtab; | |
3080 | mod->strtab = mod->core_strtab; | |
3081 | #endif | |
3082 | unset_module_init_ro_nx(mod); | |
d453cded | 3083 | module_arch_freeing_init(mod); |
34e1169d KC |
3084 | mod->module_init = NULL; |
3085 | mod->init_size = 0; | |
3086 | mod->init_ro_size = 0; | |
3087 | mod->init_text_size = 0; | |
c7496379 RR |
3088 | /* |
3089 | * We want to free module_init, but be aware that kallsyms may be | |
3090 | * walking this with preempt disabled. In all the failure paths, | |
3091 | * we call synchronize_rcu/synchronize_sched, but we don't want | |
3092 | * to slow down the success path, so use actual RCU here. | |
3093 | */ | |
3094 | call_rcu(&freeinit->rcu, do_free_init); | |
34e1169d KC |
3095 | mutex_unlock(&module_mutex); |
3096 | wake_up_all(&module_wq); | |
3097 | ||
3098 | return 0; | |
c7496379 RR |
3099 | |
3100 | fail_free_freeinit: | |
3101 | kfree(freeinit); | |
3102 | fail: | |
3103 | /* Try to protect us from buggy refcounters. */ | |
3104 | mod->state = MODULE_STATE_GOING; | |
3105 | synchronize_sched(); | |
3106 | module_put(mod); | |
3107 | blocking_notifier_call_chain(&module_notify_list, | |
3108 | MODULE_STATE_GOING, mod); | |
3109 | free_module(mod); | |
3110 | wake_up_all(&module_wq); | |
3111 | return ret; | |
34e1169d KC |
3112 | } |
3113 | ||
3114 | static int may_init_module(void) | |
3115 | { | |
3116 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3117 | return -EPERM; | |
3118 | ||
3119 | return 0; | |
3120 | } | |
3121 | ||
3c9b2c3d PZ |
3122 | /* |
3123 | * Can't use wait_event_interruptible() because our condition | |
3124 | * 'finished_loading()' contains a blocking primitive itself (mutex_lock). | |
3125 | */ | |
3126 | static int wait_finished_loading(struct module *mod) | |
3127 | { | |
3128 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
3129 | int ret = 0; | |
3130 | ||
3131 | add_wait_queue(&module_wq, &wait); | |
3132 | for (;;) { | |
3133 | if (finished_loading(mod->name)) | |
3134 | break; | |
3135 | ||
3136 | if (signal_pending(current)) { | |
3137 | ret = -ERESTARTSYS; | |
3138 | break; | |
3139 | } | |
3140 | ||
3141 | wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
3142 | } | |
3143 | remove_wait_queue(&module_wq, &wait); | |
3144 | ||
3145 | return ret; | |
3146 | } | |
3147 | ||
a3535c7e RR |
3148 | /* |
3149 | * We try to place it in the list now to make sure it's unique before | |
3150 | * we dedicate too many resources. In particular, temporary percpu | |
3151 | * memory exhaustion. | |
3152 | */ | |
3153 | static int add_unformed_module(struct module *mod) | |
3154 | { | |
3155 | int err; | |
3156 | struct module *old; | |
3157 | ||
3158 | mod->state = MODULE_STATE_UNFORMED; | |
3159 | ||
3160 | again: | |
3161 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3162 | old = find_module_all(mod->name, strlen(mod->name), true); |
3163 | if (old != NULL) { | |
a3535c7e RR |
3164 | if (old->state == MODULE_STATE_COMING |
3165 | || old->state == MODULE_STATE_UNFORMED) { | |
3166 | /* Wait in case it fails to load. */ | |
3167 | mutex_unlock(&module_mutex); | |
3c9b2c3d PZ |
3168 | |
3169 | err = wait_finished_loading(mod); | |
a3535c7e RR |
3170 | if (err) |
3171 | goto out_unlocked; | |
3172 | goto again; | |
3173 | } | |
3174 | err = -EEXIST; | |
3175 | goto out; | |
3176 | } | |
3177 | list_add_rcu(&mod->list, &modules); | |
3178 | err = 0; | |
3179 | ||
3180 | out: | |
3181 | mutex_unlock(&module_mutex); | |
3182 | out_unlocked: | |
3183 | return err; | |
3184 | } | |
3185 | ||
3186 | static int complete_formation(struct module *mod, struct load_info *info) | |
3187 | { | |
3188 | int err; | |
3189 | ||
3190 | mutex_lock(&module_mutex); | |
3191 | ||
3192 | /* Find duplicate symbols (must be called under lock). */ | |
3193 | err = verify_export_symbols(mod); | |
3194 | if (err < 0) | |
3195 | goto out; | |
3196 | ||
3197 | /* This relies on module_mutex for list integrity. */ | |
3198 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3199 | ||
4982223e RR |
3200 | /* Set RO and NX regions for core */ |
3201 | set_section_ro_nx(mod->module_core, | |
3202 | mod->core_text_size, | |
3203 | mod->core_ro_size, | |
3204 | mod->core_size); | |
3205 | ||
3206 | /* Set RO and NX regions for init */ | |
3207 | set_section_ro_nx(mod->module_init, | |
3208 | mod->init_text_size, | |
3209 | mod->init_ro_size, | |
3210 | mod->init_size); | |
3211 | ||
a3535c7e RR |
3212 | /* Mark state as coming so strong_try_module_get() ignores us, |
3213 | * but kallsyms etc. can see us. */ | |
3214 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3215 | mutex_unlock(&module_mutex); |
3216 | ||
3217 | blocking_notifier_call_chain(&module_notify_list, | |
3218 | MODULE_STATE_COMING, mod); | |
3219 | return 0; | |
a3535c7e RR |
3220 | |
3221 | out: | |
3222 | mutex_unlock(&module_mutex); | |
3223 | return err; | |
3224 | } | |
3225 | ||
54041d8a RR |
3226 | static int unknown_module_param_cb(char *param, char *val, const char *modname) |
3227 | { | |
6da0b565 | 3228 | /* Check for magic 'dyndbg' arg */ |
54041d8a | 3229 | int ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3230 | if (ret != 0) |
3231 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3232 | return 0; |
3233 | } | |
3234 | ||
d913188c RR |
3235 | /* Allocate and load the module: note that size of section 0 is always |
3236 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3237 | static int load_module(struct load_info *info, const char __user *uargs, |
3238 | int flags) | |
d913188c | 3239 | { |
a3535c7e | 3240 | struct module *mod; |
d913188c | 3241 | long err; |
51e158c1 | 3242 | char *after_dashes; |
d913188c | 3243 | |
34e1169d KC |
3244 | err = module_sig_check(info); |
3245 | if (err) | |
3246 | goto free_copy; | |
d913188c | 3247 | |
34e1169d | 3248 | err = elf_header_check(info); |
d913188c | 3249 | if (err) |
34e1169d | 3250 | goto free_copy; |
d913188c RR |
3251 | |
3252 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3253 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3254 | if (IS_ERR(mod)) { |
3255 | err = PTR_ERR(mod); | |
d913188c | 3256 | goto free_copy; |
1da177e4 | 3257 | } |
1da177e4 | 3258 | |
a3535c7e RR |
3259 | /* Reserve our place in the list. */ |
3260 | err = add_unformed_module(mod); | |
3261 | if (err) | |
1fb9341a | 3262 | goto free_module; |
1fb9341a | 3263 | |
106a4ee2 | 3264 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3265 | mod->sig_ok = info->sig_ok; |
64748a2c | 3266 | if (!mod->sig_ok) { |
bddb12b3 AM |
3267 | pr_notice_once("%s: module verification failed: signature " |
3268 | "and/or required key missing - tainting " | |
3269 | "kernel\n", mod->name); | |
66cc69e3 | 3270 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3271 | } |
106a4ee2 RR |
3272 | #endif |
3273 | ||
8d8022e8 | 3274 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3275 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3276 | if (err) |
3277 | goto unlink_mod; | |
3278 | ||
49668688 | 3279 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3280 | err = module_unload_init(mod); |
3281 | if (err) | |
1fb9341a | 3282 | goto unlink_mod; |
1da177e4 | 3283 | |
22e268eb RR |
3284 | /* Now we've got everything in the final locations, we can |
3285 | * find optional sections. */ | |
eb3057df FH |
3286 | err = find_module_sections(mod, info); |
3287 | if (err) | |
3288 | goto free_unload; | |
9b37ccfc | 3289 | |
49668688 | 3290 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3291 | if (err) |
3292 | goto free_unload; | |
9841d61d | 3293 | |
c988d2b2 | 3294 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3295 | setup_modinfo(mod, info); |
c988d2b2 | 3296 | |
1da177e4 | 3297 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3298 | err = simplify_symbols(mod, info); |
1da177e4 | 3299 | if (err < 0) |
d913188c | 3300 | goto free_modinfo; |
1da177e4 | 3301 | |
34e1169d | 3302 | err = apply_relocations(mod, info); |
22e268eb | 3303 | if (err < 0) |
d913188c | 3304 | goto free_modinfo; |
1da177e4 | 3305 | |
34e1169d | 3306 | err = post_relocation(mod, info); |
1da177e4 | 3307 | if (err < 0) |
d913188c | 3308 | goto free_modinfo; |
1da177e4 | 3309 | |
22e268eb | 3310 | flush_module_icache(mod); |
378bac82 | 3311 | |
6526c534 RR |
3312 | /* Now copy in args */ |
3313 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3314 | if (IS_ERR(mod->args)) { | |
3315 | err = PTR_ERR(mod->args); | |
3316 | goto free_arch_cleanup; | |
3317 | } | |
8d3b33f6 | 3318 | |
34e1169d | 3319 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3320 | |
a949ae56 SRRH |
3321 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3322 | ftrace_module_init(mod); | |
3323 | ||
a3535c7e RR |
3324 | /* Finally it's fully formed, ready to start executing. */ |
3325 | err = complete_formation(mod, info); | |
3326 | if (err) | |
1fb9341a | 3327 | goto ddebug_cleanup; |
be593f4c | 3328 | |
51f3d0f4 | 3329 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 RR |
3330 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
3331 | -32768, 32767, unknown_module_param_cb); | |
3332 | if (IS_ERR(after_dashes)) { | |
3333 | err = PTR_ERR(after_dashes); | |
1fb9341a | 3334 | goto bug_cleanup; |
51e158c1 RR |
3335 | } else if (after_dashes) { |
3336 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3337 | mod->name, after_dashes); | |
3338 | } | |
1da177e4 | 3339 | |
51f3d0f4 | 3340 | /* Link in to syfs. */ |
34e1169d | 3341 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3342 | if (err < 0) |
1fb9341a | 3343 | goto bug_cleanup; |
80a3d1bb | 3344 | |
48fd1188 | 3345 | /* Get rid of temporary copy. */ |
34e1169d | 3346 | free_copy(info); |
1da177e4 LT |
3347 | |
3348 | /* Done! */ | |
51f3d0f4 | 3349 | trace_module_load(mod); |
34e1169d KC |
3350 | |
3351 | return do_init_module(mod); | |
1da177e4 | 3352 | |
1fb9341a RR |
3353 | bug_cleanup: |
3354 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3355 | mutex_lock(&module_mutex); |
5336377d | 3356 | module_bug_cleanup(mod); |
ee61abb3 | 3357 | mutex_unlock(&module_mutex); |
ff7e0055 AL |
3358 | |
3359 | /* we can't deallocate the module until we clear memory protection */ | |
3360 | unset_module_init_ro_nx(mod); | |
3361 | unset_module_core_ro_nx(mod); | |
3362 | ||
a3535c7e | 3363 | ddebug_cleanup: |
1fb9341a | 3364 | dynamic_debug_remove(info->debug); |
e91defa2 | 3365 | synchronize_sched(); |
6526c534 RR |
3366 | kfree(mod->args); |
3367 | free_arch_cleanup: | |
1da177e4 | 3368 | module_arch_cleanup(mod); |
d913188c | 3369 | free_modinfo: |
a263f776 | 3370 | free_modinfo(mod); |
22e268eb | 3371 | free_unload: |
1da177e4 | 3372 | module_unload_free(mod); |
1fb9341a RR |
3373 | unlink_mod: |
3374 | mutex_lock(&module_mutex); | |
3375 | /* Unlink carefully: kallsyms could be walking list. */ | |
3376 | list_del_rcu(&mod->list); | |
3377 | wake_up_all(&module_wq); | |
4f48795b MH |
3378 | /* Wait for RCU synchronizing before releasing mod->list. */ |
3379 | synchronize_rcu(); | |
1fb9341a | 3380 | mutex_unlock(&module_mutex); |
d913188c | 3381 | free_module: |
34e1169d | 3382 | module_deallocate(mod, info); |
d913188c | 3383 | free_copy: |
34e1169d KC |
3384 | free_copy(info); |
3385 | return err; | |
b99b87f7 PO |
3386 | } |
3387 | ||
17da2bd9 HC |
3388 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3389 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3390 | { |
34e1169d KC |
3391 | int err; |
3392 | struct load_info info = { }; | |
1da177e4 | 3393 | |
34e1169d KC |
3394 | err = may_init_module(); |
3395 | if (err) | |
3396 | return err; | |
1da177e4 | 3397 | |
34e1169d KC |
3398 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3399 | umod, len, uargs); | |
1da177e4 | 3400 | |
34e1169d KC |
3401 | err = copy_module_from_user(umod, len, &info); |
3402 | if (err) | |
3403 | return err; | |
1da177e4 | 3404 | |
2f3238ae | 3405 | return load_module(&info, uargs, 0); |
34e1169d | 3406 | } |
94462ad3 | 3407 | |
2f3238ae | 3408 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d KC |
3409 | { |
3410 | int err; | |
3411 | struct load_info info = { }; | |
94462ad3 | 3412 | |
34e1169d KC |
3413 | err = may_init_module(); |
3414 | if (err) | |
3415 | return err; | |
1da177e4 | 3416 | |
2f3238ae | 3417 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3418 | |
2f3238ae RR |
3419 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3420 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3421 | return -EINVAL; | |
d6de2c80 | 3422 | |
34e1169d KC |
3423 | err = copy_module_from_fd(fd, &info); |
3424 | if (err) | |
3425 | return err; | |
1da177e4 | 3426 | |
2f3238ae | 3427 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3428 | } |
3429 | ||
3430 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3431 | { | |
3432 | return ((void *)addr >= start && (void *)addr < start + size); | |
3433 | } | |
3434 | ||
3435 | #ifdef CONFIG_KALLSYMS | |
3436 | /* | |
3437 | * This ignores the intensely annoying "mapping symbols" found | |
3438 | * in ARM ELF files: $a, $t and $d. | |
3439 | */ | |
3440 | static inline int is_arm_mapping_symbol(const char *str) | |
3441 | { | |
2e3a10a1 RK |
3442 | if (str[0] == '.' && str[1] == 'L') |
3443 | return true; | |
6c34f1f5 | 3444 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3445 | && (str[2] == '\0' || str[2] == '.'); |
3446 | } | |
3447 | ||
3448 | static const char *get_ksymbol(struct module *mod, | |
3449 | unsigned long addr, | |
3450 | unsigned long *size, | |
3451 | unsigned long *offset) | |
3452 | { | |
3453 | unsigned int i, best = 0; | |
3454 | unsigned long nextval; | |
3455 | ||
3456 | /* At worse, next value is at end of module */ | |
a06f6211 | 3457 | if (within_module_init(addr, mod)) |
1da177e4 | 3458 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 3459 | else |
1da177e4 LT |
3460 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
3461 | ||
25985edc | 3462 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3463 | starts real symbols at 1). */ |
1da177e4 LT |
3464 | for (i = 1; i < mod->num_symtab; i++) { |
3465 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
3466 | continue; | |
3467 | ||
3468 | /* We ignore unnamed symbols: they're uninformative | |
3469 | * and inserted at a whim. */ | |
3470 | if (mod->symtab[i].st_value <= addr | |
3471 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
3472 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3473 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3474 | best = i; | |
3475 | if (mod->symtab[i].st_value > addr | |
3476 | && mod->symtab[i].st_value < nextval | |
3477 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3478 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3479 | nextval = mod->symtab[i].st_value; | |
3480 | } | |
3481 | ||
3482 | if (!best) | |
3483 | return NULL; | |
3484 | ||
ffb45122 AD |
3485 | if (size) |
3486 | *size = nextval - mod->symtab[best].st_value; | |
3487 | if (offset) | |
3488 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
3489 | return mod->strtab + mod->symtab[best].st_name; |
3490 | } | |
3491 | ||
6dd06c9f RR |
3492 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3493 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3494 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3495 | unsigned long *size, |
3496 | unsigned long *offset, | |
3497 | char **modname, | |
3498 | char *namebuf) | |
1da177e4 LT |
3499 | { |
3500 | struct module *mod; | |
cb2a5205 | 3501 | const char *ret = NULL; |
1da177e4 | 3502 | |
cb2a5205 | 3503 | preempt_disable(); |
d72b3751 | 3504 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3505 | if (mod->state == MODULE_STATE_UNFORMED) |
3506 | continue; | |
9b20a352 | 3507 | if (within_module(addr, mod)) { |
ffc50891 FBH |
3508 | if (modname) |
3509 | *modname = mod->name; | |
cb2a5205 RR |
3510 | ret = get_ksymbol(mod, addr, size, offset); |
3511 | break; | |
1da177e4 LT |
3512 | } |
3513 | } | |
6dd06c9f RR |
3514 | /* Make a copy in here where it's safe */ |
3515 | if (ret) { | |
3516 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3517 | ret = namebuf; | |
3518 | } | |
cb2a5205 | 3519 | preempt_enable(); |
92dfc9dc | 3520 | return ret; |
1da177e4 LT |
3521 | } |
3522 | ||
9d65cb4a AD |
3523 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3524 | { | |
3525 | struct module *mod; | |
3526 | ||
cb2a5205 | 3527 | preempt_disable(); |
d72b3751 | 3528 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3529 | if (mod->state == MODULE_STATE_UNFORMED) |
3530 | continue; | |
9b20a352 | 3531 | if (within_module(addr, mod)) { |
9d65cb4a AD |
3532 | const char *sym; |
3533 | ||
3534 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3535 | if (!sym) | |
3536 | goto out; | |
9281acea | 3537 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3538 | preempt_enable(); |
9d65cb4a AD |
3539 | return 0; |
3540 | } | |
3541 | } | |
3542 | out: | |
cb2a5205 | 3543 | preempt_enable(); |
9d65cb4a AD |
3544 | return -ERANGE; |
3545 | } | |
3546 | ||
a5c43dae AD |
3547 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3548 | unsigned long *offset, char *modname, char *name) | |
3549 | { | |
3550 | struct module *mod; | |
3551 | ||
cb2a5205 | 3552 | preempt_disable(); |
d72b3751 | 3553 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3554 | if (mod->state == MODULE_STATE_UNFORMED) |
3555 | continue; | |
9b20a352 | 3556 | if (within_module(addr, mod)) { |
a5c43dae AD |
3557 | const char *sym; |
3558 | ||
3559 | sym = get_ksymbol(mod, addr, size, offset); | |
3560 | if (!sym) | |
3561 | goto out; | |
3562 | if (modname) | |
9281acea | 3563 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3564 | if (name) |
9281acea | 3565 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3566 | preempt_enable(); |
a5c43dae AD |
3567 | return 0; |
3568 | } | |
3569 | } | |
3570 | out: | |
cb2a5205 | 3571 | preempt_enable(); |
a5c43dae AD |
3572 | return -ERANGE; |
3573 | } | |
3574 | ||
ea07890a AD |
3575 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3576 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3577 | { |
3578 | struct module *mod; | |
3579 | ||
cb2a5205 | 3580 | preempt_disable(); |
d72b3751 | 3581 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3582 | if (mod->state == MODULE_STATE_UNFORMED) |
3583 | continue; | |
1da177e4 LT |
3584 | if (symnum < mod->num_symtab) { |
3585 | *value = mod->symtab[symnum].st_value; | |
3586 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 3587 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
3588 | KSYM_NAME_LEN); |
3589 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 3590 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3591 | preempt_enable(); |
ea07890a | 3592 | return 0; |
1da177e4 LT |
3593 | } |
3594 | symnum -= mod->num_symtab; | |
3595 | } | |
cb2a5205 | 3596 | preempt_enable(); |
ea07890a | 3597 | return -ERANGE; |
1da177e4 LT |
3598 | } |
3599 | ||
3600 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3601 | { | |
3602 | unsigned int i; | |
3603 | ||
3604 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
3605 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3606 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
3607 | return mod->symtab[i].st_value; |
3608 | return 0; | |
3609 | } | |
3610 | ||
3611 | /* Look for this name: can be of form module:name. */ | |
3612 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3613 | { | |
3614 | struct module *mod; | |
3615 | char *colon; | |
3616 | unsigned long ret = 0; | |
3617 | ||
3618 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3619 | preempt_disable(); |
1da177e4 | 3620 | if ((colon = strchr(name, ':')) != NULL) { |
4f6de4d5 | 3621 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 3622 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 3623 | } else { |
0d21b0e3 RR |
3624 | list_for_each_entry_rcu(mod, &modules, list) { |
3625 | if (mod->state == MODULE_STATE_UNFORMED) | |
3626 | continue; | |
1da177e4 LT |
3627 | if ((ret = mod_find_symname(mod, name)) != 0) |
3628 | break; | |
0d21b0e3 | 3629 | } |
1da177e4 | 3630 | } |
cb2a5205 | 3631 | preempt_enable(); |
1da177e4 LT |
3632 | return ret; |
3633 | } | |
75a66614 AK |
3634 | |
3635 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3636 | struct module *, unsigned long), | |
3637 | void *data) | |
3638 | { | |
3639 | struct module *mod; | |
3640 | unsigned int i; | |
3641 | int ret; | |
3642 | ||
3643 | list_for_each_entry(mod, &modules, list) { | |
0d21b0e3 RR |
3644 | if (mod->state == MODULE_STATE_UNFORMED) |
3645 | continue; | |
75a66614 AK |
3646 | for (i = 0; i < mod->num_symtab; i++) { |
3647 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3648 | mod, mod->symtab[i].st_value); | |
3649 | if (ret != 0) | |
3650 | return ret; | |
3651 | } | |
3652 | } | |
3653 | return 0; | |
3654 | } | |
1da177e4 LT |
3655 | #endif /* CONFIG_KALLSYMS */ |
3656 | ||
21aa9280 | 3657 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3658 | { |
3659 | int bx = 0; | |
3660 | ||
0d21b0e3 | 3661 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
3662 | if (mod->taints || |
3663 | mod->state == MODULE_STATE_GOING || | |
3664 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3665 | buf[bx++] = '('; |
cca3e707 | 3666 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
3667 | /* Show a - for module-is-being-unloaded */ |
3668 | if (mod->state == MODULE_STATE_GOING) | |
3669 | buf[bx++] = '-'; | |
3670 | /* Show a + for module-is-being-loaded */ | |
3671 | if (mod->state == MODULE_STATE_COMING) | |
3672 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3673 | buf[bx++] = ')'; |
3674 | } | |
3675 | buf[bx] = '\0'; | |
3676 | ||
3677 | return buf; | |
3678 | } | |
3679 | ||
3b5d5c6b AD |
3680 | #ifdef CONFIG_PROC_FS |
3681 | /* Called by the /proc file system to return a list of modules. */ | |
3682 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3683 | { | |
3684 | mutex_lock(&module_mutex); | |
3685 | return seq_list_start(&modules, *pos); | |
3686 | } | |
3687 | ||
3688 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3689 | { | |
3690 | return seq_list_next(p, &modules, pos); | |
3691 | } | |
3692 | ||
3693 | static void m_stop(struct seq_file *m, void *p) | |
3694 | { | |
3695 | mutex_unlock(&module_mutex); | |
3696 | } | |
3697 | ||
1da177e4 LT |
3698 | static int m_show(struct seq_file *m, void *p) |
3699 | { | |
3700 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3701 | char buf[8]; |
3702 | ||
0d21b0e3 RR |
3703 | /* We always ignore unformed modules. */ |
3704 | if (mod->state == MODULE_STATE_UNFORMED) | |
3705 | return 0; | |
3706 | ||
2f0f2a33 | 3707 | seq_printf(m, "%s %u", |
1da177e4 LT |
3708 | mod->name, mod->init_size + mod->core_size); |
3709 | print_unload_info(m, mod); | |
3710 | ||
3711 | /* Informative for users. */ | |
3712 | seq_printf(m, " %s", | |
6da0b565 IA |
3713 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
3714 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
3715 | "Live"); |
3716 | /* Used by oprofile and other similar tools. */ | |
9f36e2c4 | 3717 | seq_printf(m, " 0x%pK", mod->module_core); |
1da177e4 | 3718 | |
fa3ba2e8 FM |
3719 | /* Taints info */ |
3720 | if (mod->taints) | |
21aa9280 | 3721 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3722 | |
6da0b565 | 3723 | seq_puts(m, "\n"); |
1da177e4 LT |
3724 | return 0; |
3725 | } | |
3726 | ||
3727 | /* Format: modulename size refcount deps address | |
3728 | ||
3729 | Where refcount is a number or -, and deps is a comma-separated list | |
3730 | of depends or -. | |
3731 | */ | |
3b5d5c6b | 3732 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3733 | .start = m_start, |
3734 | .next = m_next, | |
3735 | .stop = m_stop, | |
3736 | .show = m_show | |
3737 | }; | |
3738 | ||
3b5d5c6b AD |
3739 | static int modules_open(struct inode *inode, struct file *file) |
3740 | { | |
3741 | return seq_open(file, &modules_op); | |
3742 | } | |
3743 | ||
3744 | static const struct file_operations proc_modules_operations = { | |
3745 | .open = modules_open, | |
3746 | .read = seq_read, | |
3747 | .llseek = seq_lseek, | |
3748 | .release = seq_release, | |
3749 | }; | |
3750 | ||
3751 | static int __init proc_modules_init(void) | |
3752 | { | |
3753 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3754 | return 0; | |
3755 | } | |
3756 | module_init(proc_modules_init); | |
3757 | #endif | |
3758 | ||
1da177e4 LT |
3759 | /* Given an address, look for it in the module exception tables. */ |
3760 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3761 | { | |
1da177e4 LT |
3762 | const struct exception_table_entry *e = NULL; |
3763 | struct module *mod; | |
3764 | ||
24da1cbf | 3765 | preempt_disable(); |
d72b3751 | 3766 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3767 | if (mod->state == MODULE_STATE_UNFORMED) |
3768 | continue; | |
1da177e4 LT |
3769 | if (mod->num_exentries == 0) |
3770 | continue; | |
22a8bdeb | 3771 | |
1da177e4 LT |
3772 | e = search_extable(mod->extable, |
3773 | mod->extable + mod->num_exentries - 1, | |
3774 | addr); | |
3775 | if (e) | |
3776 | break; | |
3777 | } | |
24da1cbf | 3778 | preempt_enable(); |
1da177e4 LT |
3779 | |
3780 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3781 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3782 | return e; |
3783 | } | |
3784 | ||
4d435f9d | 3785 | /* |
e610499e RR |
3786 | * is_module_address - is this address inside a module? |
3787 | * @addr: the address to check. | |
3788 | * | |
3789 | * See is_module_text_address() if you simply want to see if the address | |
3790 | * is code (not data). | |
4d435f9d | 3791 | */ |
e610499e | 3792 | bool is_module_address(unsigned long addr) |
4d435f9d | 3793 | { |
e610499e | 3794 | bool ret; |
4d435f9d | 3795 | |
24da1cbf | 3796 | preempt_disable(); |
e610499e | 3797 | ret = __module_address(addr) != NULL; |
24da1cbf | 3798 | preempt_enable(); |
4d435f9d | 3799 | |
e610499e | 3800 | return ret; |
4d435f9d IM |
3801 | } |
3802 | ||
e610499e RR |
3803 | /* |
3804 | * __module_address - get the module which contains an address. | |
3805 | * @addr: the address. | |
3806 | * | |
3807 | * Must be called with preempt disabled or module mutex held so that | |
3808 | * module doesn't get freed during this. | |
3809 | */ | |
714f83d5 | 3810 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3811 | { |
3812 | struct module *mod; | |
3813 | ||
3a642e99 RR |
3814 | if (addr < module_addr_min || addr > module_addr_max) |
3815 | return NULL; | |
3816 | ||
0d21b0e3 RR |
3817 | list_for_each_entry_rcu(mod, &modules, list) { |
3818 | if (mod->state == MODULE_STATE_UNFORMED) | |
3819 | continue; | |
9b20a352 | 3820 | if (within_module(addr, mod)) |
1da177e4 | 3821 | return mod; |
0d21b0e3 | 3822 | } |
1da177e4 LT |
3823 | return NULL; |
3824 | } | |
c6b37801 | 3825 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3826 | |
e610499e RR |
3827 | /* |
3828 | * is_module_text_address - is this address inside module code? | |
3829 | * @addr: the address to check. | |
3830 | * | |
3831 | * See is_module_address() if you simply want to see if the address is | |
3832 | * anywhere in a module. See kernel_text_address() for testing if an | |
3833 | * address corresponds to kernel or module code. | |
3834 | */ | |
3835 | bool is_module_text_address(unsigned long addr) | |
3836 | { | |
3837 | bool ret; | |
3838 | ||
3839 | preempt_disable(); | |
3840 | ret = __module_text_address(addr) != NULL; | |
3841 | preempt_enable(); | |
3842 | ||
3843 | return ret; | |
3844 | } | |
3845 | ||
3846 | /* | |
3847 | * __module_text_address - get the module whose code contains an address. | |
3848 | * @addr: the address. | |
3849 | * | |
3850 | * Must be called with preempt disabled or module mutex held so that | |
3851 | * module doesn't get freed during this. | |
3852 | */ | |
3853 | struct module *__module_text_address(unsigned long addr) | |
3854 | { | |
3855 | struct module *mod = __module_address(addr); | |
3856 | if (mod) { | |
3857 | /* Make sure it's within the text section. */ | |
3858 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3859 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3860 | mod = NULL; | |
3861 | } | |
3862 | return mod; | |
3863 | } | |
c6b37801 | 3864 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3865 | |
1da177e4 LT |
3866 | /* Don't grab lock, we're oopsing. */ |
3867 | void print_modules(void) | |
3868 | { | |
3869 | struct module *mod; | |
2bc2d61a | 3870 | char buf[8]; |
1da177e4 | 3871 | |
b231125a | 3872 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3873 | /* Most callers should already have preempt disabled, but make sure */ |
3874 | preempt_disable(); | |
0d21b0e3 RR |
3875 | list_for_each_entry_rcu(mod, &modules, list) { |
3876 | if (mod->state == MODULE_STATE_UNFORMED) | |
3877 | continue; | |
27bba4d6 | 3878 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 3879 | } |
d72b3751 | 3880 | preempt_enable(); |
e14af7ee | 3881 | if (last_unloaded_module[0]) |
27bba4d6 JS |
3882 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
3883 | pr_cont("\n"); | |
1da177e4 LT |
3884 | } |
3885 | ||
1da177e4 | 3886 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3887 | /* Generate the signature for all relevant module structures here. |
3888 | * If these change, we don't want to try to parse the module. */ | |
3889 | void module_layout(struct module *mod, | |
3890 | struct modversion_info *ver, | |
3891 | struct kernel_param *kp, | |
3892 | struct kernel_symbol *ks, | |
65498646 | 3893 | struct tracepoint * const *tp) |
8c8ef42a RR |
3894 | { |
3895 | } | |
3896 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3897 | #endif |