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Commit | Line | Data |
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f71d20e9 | 1 | /* |
1da177e4 LT |
2 | Copyright (C) 2002 Richard Henderson |
3 | Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. | |
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 | */ | |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/moduleloader.h> | |
6d723736 | 21 | #include <linux/ftrace_event.h> |
1da177e4 | 22 | #include <linux/init.h> |
ae84e324 | 23 | #include <linux/kallsyms.h> |
3b5d5c6b | 24 | #include <linux/fs.h> |
6d760133 | 25 | #include <linux/sysfs.h> |
9f158333 | 26 | #include <linux/kernel.h> |
1da177e4 LT |
27 | #include <linux/slab.h> |
28 | #include <linux/vmalloc.h> | |
29 | #include <linux/elf.h> | |
3b5d5c6b | 30 | #include <linux/proc_fs.h> |
1da177e4 LT |
31 | #include <linux/seq_file.h> |
32 | #include <linux/syscalls.h> | |
33 | #include <linux/fcntl.h> | |
34 | #include <linux/rcupdate.h> | |
c59ede7b | 35 | #include <linux/capability.h> |
1da177e4 LT |
36 | #include <linux/cpu.h> |
37 | #include <linux/moduleparam.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/err.h> | |
40 | #include <linux/vermagic.h> | |
41 | #include <linux/notifier.h> | |
f6a57033 | 42 | #include <linux/sched.h> |
1da177e4 LT |
43 | #include <linux/stop_machine.h> |
44 | #include <linux/device.h> | |
c988d2b2 | 45 | #include <linux/string.h> |
97d1f15b | 46 | #include <linux/mutex.h> |
d72b3751 | 47 | #include <linux/rculist.h> |
1da177e4 | 48 | #include <asm/uaccess.h> |
1da177e4 | 49 | #include <asm/cacheflush.h> |
eb8cdec4 | 50 | #include <asm/mmu_context.h> |
b817f6fe | 51 | #include <linux/license.h> |
6d762394 | 52 | #include <asm/sections.h> |
97e1c18e | 53 | #include <linux/tracepoint.h> |
90d595fe | 54 | #include <linux/ftrace.h> |
22a9d645 | 55 | #include <linux/async.h> |
fbf59bc9 | 56 | #include <linux/percpu.h> |
4f2294b6 | 57 | #include <linux/kmemleak.h> |
1da177e4 | 58 | |
7ead8b83 LZ |
59 | #define CREATE_TRACE_POINTS |
60 | #include <trace/events/module.h> | |
61 | ||
1da177e4 LT |
62 | #if 0 |
63 | #define DEBUGP printk | |
64 | #else | |
65 | #define DEBUGP(fmt , a...) | |
66 | #endif | |
67 | ||
68 | #ifndef ARCH_SHF_SMALL | |
69 | #define ARCH_SHF_SMALL 0 | |
70 | #endif | |
71 | ||
72 | /* If this is set, the section belongs in the init part of the module */ | |
73 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
74 | ||
24da1cbf | 75 | /* List of modules, protected by module_mutex or preempt_disable |
d72b3751 | 76 | * (delete uses stop_machine/add uses RCU list operations). */ |
c6b37801 TA |
77 | DEFINE_MUTEX(module_mutex); |
78 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 79 | static LIST_HEAD(modules); |
67fc4e0c JW |
80 | #ifdef CONFIG_KGDB_KDB |
81 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
82 | #endif /* CONFIG_KGDB_KDB */ | |
83 | ||
1da177e4 | 84 | |
19e4529e SR |
85 | /* Block module loading/unloading? */ |
86 | int modules_disabled = 0; | |
87 | ||
c9a3ba55 RR |
88 | /* Waiting for a module to finish initializing? */ |
89 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
90 | ||
e041c683 | 91 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 92 | |
e610499e | 93 | /* Bounds of module allocation, for speeding __module_address */ |
3a642e99 RR |
94 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
95 | ||
1da177e4 LT |
96 | int register_module_notifier(struct notifier_block * nb) |
97 | { | |
e041c683 | 98 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
99 | } |
100 | EXPORT_SYMBOL(register_module_notifier); | |
101 | ||
102 | int unregister_module_notifier(struct notifier_block * nb) | |
103 | { | |
e041c683 | 104 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
105 | } |
106 | EXPORT_SYMBOL(unregister_module_notifier); | |
107 | ||
9a4b9708 ML |
108 | /* We require a truly strong try_module_get(): 0 means failure due to |
109 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
110 | static inline int strong_try_module_get(struct module *mod) |
111 | { | |
112 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
113 | return -EBUSY; |
114 | if (try_module_get(mod)) | |
1da177e4 | 115 | return 0; |
c9a3ba55 RR |
116 | else |
117 | return -ENOENT; | |
1da177e4 LT |
118 | } |
119 | ||
fa3ba2e8 FM |
120 | static inline void add_taint_module(struct module *mod, unsigned flag) |
121 | { | |
122 | add_taint(flag); | |
25ddbb18 | 123 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
124 | } |
125 | ||
02a3e59a RD |
126 | /* |
127 | * A thread that wants to hold a reference to a module only while it | |
128 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
129 | */ |
130 | void __module_put_and_exit(struct module *mod, long code) | |
131 | { | |
132 | module_put(mod); | |
133 | do_exit(code); | |
134 | } | |
135 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 136 | |
1da177e4 LT |
137 | /* Find a module section: 0 means not found. */ |
138 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
139 | Elf_Shdr *sechdrs, | |
140 | const char *secstrings, | |
141 | const char *name) | |
142 | { | |
143 | unsigned int i; | |
144 | ||
145 | for (i = 1; i < hdr->e_shnum; i++) | |
146 | /* Alloc bit cleared means "ignore it." */ | |
147 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
148 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
149 | return i; | |
150 | return 0; | |
151 | } | |
152 | ||
5e458cc0 RR |
153 | /* Find a module section, or NULL. */ |
154 | static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs, | |
155 | const char *secstrings, const char *name) | |
156 | { | |
157 | /* Section 0 has sh_addr 0. */ | |
158 | return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr; | |
159 | } | |
160 | ||
161 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
162 | static void *section_objs(Elf_Ehdr *hdr, | |
163 | Elf_Shdr *sechdrs, | |
164 | const char *secstrings, | |
165 | const char *name, | |
166 | size_t object_size, | |
167 | unsigned int *num) | |
168 | { | |
169 | unsigned int sec = find_sec(hdr, sechdrs, secstrings, name); | |
170 | ||
171 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
172 | *num = sechdrs[sec].sh_size / object_size; | |
173 | return (void *)sechdrs[sec].sh_addr; | |
174 | } | |
175 | ||
1da177e4 LT |
176 | /* Provided by the linker */ |
177 | extern const struct kernel_symbol __start___ksymtab[]; | |
178 | extern const struct kernel_symbol __stop___ksymtab[]; | |
179 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
180 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
181 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
182 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
183 | extern const unsigned long __start___kcrctab[]; |
184 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 185 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
186 | #ifdef CONFIG_UNUSED_SYMBOLS |
187 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
188 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
189 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
190 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
191 | extern const unsigned long __start___kcrctab_unused[]; |
192 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 193 | #endif |
1da177e4 LT |
194 | |
195 | #ifndef CONFIG_MODVERSIONS | |
196 | #define symversion(base, idx) NULL | |
197 | #else | |
f83ca9fe | 198 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
199 | #endif |
200 | ||
dafd0940 RR |
201 | static bool each_symbol_in_section(const struct symsearch *arr, |
202 | unsigned int arrsize, | |
203 | struct module *owner, | |
204 | bool (*fn)(const struct symsearch *syms, | |
205 | struct module *owner, | |
206 | unsigned int symnum, void *data), | |
207 | void *data) | |
ad9546c9 | 208 | { |
dafd0940 | 209 | unsigned int i, j; |
ad9546c9 | 210 | |
dafd0940 RR |
211 | for (j = 0; j < arrsize; j++) { |
212 | for (i = 0; i < arr[j].stop - arr[j].start; i++) | |
213 | if (fn(&arr[j], owner, i, data)) | |
214 | return true; | |
f71d20e9 | 215 | } |
dafd0940 RR |
216 | |
217 | return false; | |
ad9546c9 RR |
218 | } |
219 | ||
dafd0940 | 220 | /* Returns true as soon as fn returns true, otherwise false. */ |
c6b37801 TA |
221 | bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner, |
222 | unsigned int symnum, void *data), void *data) | |
ad9546c9 RR |
223 | { |
224 | struct module *mod; | |
ad9546c9 RR |
225 | const struct symsearch arr[] = { |
226 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, | |
dafd0940 | 227 | NOT_GPL_ONLY, false }, |
ad9546c9 | 228 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
229 | __start___kcrctab_gpl, |
230 | GPL_ONLY, false }, | |
ad9546c9 | 231 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
232 | __start___kcrctab_gpl_future, |
233 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 234 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 235 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
236 | __start___kcrctab_unused, |
237 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 238 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
239 | __start___kcrctab_unused_gpl, |
240 | GPL_ONLY, true }, | |
f7f5b675 | 241 | #endif |
ad9546c9 | 242 | }; |
f71d20e9 | 243 | |
dafd0940 RR |
244 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
245 | return true; | |
f71d20e9 | 246 | |
d72b3751 | 247 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
248 | struct symsearch arr[] = { |
249 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 250 | NOT_GPL_ONLY, false }, |
ad9546c9 | 251 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
252 | mod->gpl_crcs, |
253 | GPL_ONLY, false }, | |
ad9546c9 RR |
254 | { mod->gpl_future_syms, |
255 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
256 | mod->gpl_future_crcs, |
257 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 258 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
259 | { mod->unused_syms, |
260 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
261 | mod->unused_crcs, |
262 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
263 | { mod->unused_gpl_syms, |
264 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
265 | mod->unused_gpl_crcs, |
266 | GPL_ONLY, true }, | |
f7f5b675 | 267 | #endif |
ad9546c9 RR |
268 | }; |
269 | ||
dafd0940 RR |
270 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
271 | return true; | |
272 | } | |
273 | return false; | |
274 | } | |
c6b37801 | 275 | EXPORT_SYMBOL_GPL(each_symbol); |
dafd0940 RR |
276 | |
277 | struct find_symbol_arg { | |
278 | /* Input */ | |
279 | const char *name; | |
280 | bool gplok; | |
281 | bool warn; | |
282 | ||
283 | /* Output */ | |
284 | struct module *owner; | |
285 | const unsigned long *crc; | |
414fd31b | 286 | const struct kernel_symbol *sym; |
dafd0940 RR |
287 | }; |
288 | ||
289 | static bool find_symbol_in_section(const struct symsearch *syms, | |
290 | struct module *owner, | |
291 | unsigned int symnum, void *data) | |
292 | { | |
293 | struct find_symbol_arg *fsa = data; | |
294 | ||
295 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) | |
296 | return false; | |
297 | ||
298 | if (!fsa->gplok) { | |
299 | if (syms->licence == GPL_ONLY) | |
300 | return false; | |
301 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
302 | printk(KERN_WARNING "Symbol %s is being used " | |
303 | "by a non-GPL module, which will not " | |
304 | "be allowed in the future\n", fsa->name); | |
305 | printk(KERN_WARNING "Please see the file " | |
306 | "Documentation/feature-removal-schedule.txt " | |
307 | "in the kernel source tree for more details.\n"); | |
9f28bb7e | 308 | } |
1da177e4 | 309 | } |
ad9546c9 | 310 | |
f7f5b675 | 311 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
312 | if (syms->unused && fsa->warn) { |
313 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
314 | "however this module is using it.\n", fsa->name); | |
315 | printk(KERN_WARNING | |
316 | "This symbol will go away in the future.\n"); | |
317 | printk(KERN_WARNING | |
318 | "Please evalute if this is the right api to use and if " | |
319 | "it really is, submit a report the linux kernel " | |
320 | "mailinglist together with submitting your code for " | |
321 | "inclusion.\n"); | |
322 | } | |
f7f5b675 | 323 | #endif |
dafd0940 RR |
324 | |
325 | fsa->owner = owner; | |
326 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 327 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
328 | return true; |
329 | } | |
330 | ||
414fd31b TA |
331 | /* Find a symbol and return it, along with, (optional) crc and |
332 | * (optional) module which owns it */ | |
c6b37801 TA |
333 | const struct kernel_symbol *find_symbol(const char *name, |
334 | struct module **owner, | |
335 | const unsigned long **crc, | |
336 | bool gplok, | |
337 | bool warn) | |
dafd0940 RR |
338 | { |
339 | struct find_symbol_arg fsa; | |
340 | ||
341 | fsa.name = name; | |
342 | fsa.gplok = gplok; | |
343 | fsa.warn = warn; | |
344 | ||
345 | if (each_symbol(find_symbol_in_section, &fsa)) { | |
346 | if (owner) | |
347 | *owner = fsa.owner; | |
348 | if (crc) | |
349 | *crc = fsa.crc; | |
414fd31b | 350 | return fsa.sym; |
dafd0940 RR |
351 | } |
352 | ||
1da177e4 | 353 | DEBUGP("Failed to find symbol %s\n", name); |
414fd31b | 354 | return NULL; |
1da177e4 | 355 | } |
c6b37801 | 356 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 357 | |
1da177e4 | 358 | /* Search for module by name: must hold module_mutex. */ |
c6b37801 | 359 | struct module *find_module(const char *name) |
1da177e4 LT |
360 | { |
361 | struct module *mod; | |
362 | ||
363 | list_for_each_entry(mod, &modules, list) { | |
364 | if (strcmp(mod->name, name) == 0) | |
365 | return mod; | |
366 | } | |
367 | return NULL; | |
368 | } | |
c6b37801 | 369 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
370 | |
371 | #ifdef CONFIG_SMP | |
fbf59bc9 | 372 | |
259354de | 373 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 374 | { |
259354de TH |
375 | return mod->percpu; |
376 | } | |
fbf59bc9 | 377 | |
259354de TH |
378 | static int percpu_modalloc(struct module *mod, |
379 | unsigned long size, unsigned long align) | |
380 | { | |
fbf59bc9 TH |
381 | if (align > PAGE_SIZE) { |
382 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
259354de | 383 | mod->name, align, PAGE_SIZE); |
fbf59bc9 TH |
384 | align = PAGE_SIZE; |
385 | } | |
386 | ||
259354de TH |
387 | mod->percpu = __alloc_reserved_percpu(size, align); |
388 | if (!mod->percpu) { | |
fbf59bc9 TH |
389 | printk(KERN_WARNING |
390 | "Could not allocate %lu bytes percpu data\n", size); | |
259354de TH |
391 | return -ENOMEM; |
392 | } | |
393 | mod->percpu_size = size; | |
394 | return 0; | |
fbf59bc9 TH |
395 | } |
396 | ||
259354de | 397 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 398 | { |
259354de | 399 | free_percpu(mod->percpu); |
fbf59bc9 TH |
400 | } |
401 | ||
6b588c18 TH |
402 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, |
403 | Elf_Shdr *sechdrs, | |
404 | const char *secstrings) | |
405 | { | |
3d9a854c | 406 | return find_sec(hdr, sechdrs, secstrings, ".data..percpu"); |
6b588c18 TH |
407 | } |
408 | ||
259354de TH |
409 | static void percpu_modcopy(struct module *mod, |
410 | const void *from, unsigned long size) | |
6b588c18 TH |
411 | { |
412 | int cpu; | |
413 | ||
414 | for_each_possible_cpu(cpu) | |
259354de | 415 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
416 | } |
417 | ||
10fad5e4 TH |
418 | /** |
419 | * is_module_percpu_address - test whether address is from module static percpu | |
420 | * @addr: address to test | |
421 | * | |
422 | * Test whether @addr belongs to module static percpu area. | |
423 | * | |
424 | * RETURNS: | |
425 | * %true if @addr is from module static percpu area | |
426 | */ | |
427 | bool is_module_percpu_address(unsigned long addr) | |
428 | { | |
429 | struct module *mod; | |
430 | unsigned int cpu; | |
431 | ||
432 | preempt_disable(); | |
433 | ||
434 | list_for_each_entry_rcu(mod, &modules, list) { | |
435 | if (!mod->percpu_size) | |
436 | continue; | |
437 | for_each_possible_cpu(cpu) { | |
438 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
439 | ||
440 | if ((void *)addr >= start && | |
441 | (void *)addr < start + mod->percpu_size) { | |
442 | preempt_enable(); | |
443 | return true; | |
444 | } | |
445 | } | |
446 | } | |
447 | ||
448 | preempt_enable(); | |
449 | return false; | |
6b588c18 TH |
450 | } |
451 | ||
1da177e4 | 452 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 453 | |
259354de | 454 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
455 | { |
456 | return NULL; | |
457 | } | |
259354de TH |
458 | static inline int percpu_modalloc(struct module *mod, |
459 | unsigned long size, unsigned long align) | |
460 | { | |
461 | return -ENOMEM; | |
462 | } | |
463 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 464 | { |
1da177e4 LT |
465 | } |
466 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
467 | Elf_Shdr *sechdrs, | |
468 | const char *secstrings) | |
469 | { | |
470 | return 0; | |
471 | } | |
259354de TH |
472 | static inline void percpu_modcopy(struct module *mod, |
473 | const void *from, unsigned long size) | |
1da177e4 LT |
474 | { |
475 | /* pcpusec should be 0, and size of that section should be 0. */ | |
476 | BUG_ON(size != 0); | |
477 | } | |
10fad5e4 TH |
478 | bool is_module_percpu_address(unsigned long addr) |
479 | { | |
480 | return false; | |
481 | } | |
6b588c18 | 482 | |
1da177e4 LT |
483 | #endif /* CONFIG_SMP */ |
484 | ||
c988d2b2 MD |
485 | #define MODINFO_ATTR(field) \ |
486 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
487 | { \ | |
488 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
489 | } \ | |
490 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
491 | struct module *mod, char *buffer) \ | |
492 | { \ | |
493 | return sprintf(buffer, "%s\n", mod->field); \ | |
494 | } \ | |
495 | static int modinfo_##field##_exists(struct module *mod) \ | |
496 | { \ | |
497 | return mod->field != NULL; \ | |
498 | } \ | |
499 | static void free_modinfo_##field(struct module *mod) \ | |
500 | { \ | |
22a8bdeb DW |
501 | kfree(mod->field); \ |
502 | mod->field = NULL; \ | |
c988d2b2 MD |
503 | } \ |
504 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 505 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
506 | .show = show_modinfo_##field, \ |
507 | .setup = setup_modinfo_##field, \ | |
508 | .test = modinfo_##field##_exists, \ | |
509 | .free = free_modinfo_##field, \ | |
510 | }; | |
511 | ||
512 | MODINFO_ATTR(version); | |
513 | MODINFO_ATTR(srcversion); | |
514 | ||
e14af7ee AV |
515 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
516 | ||
03e88ae1 | 517 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
518 | |
519 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
520 | ||
1da177e4 LT |
521 | /* Init the unload section of the module. */ |
522 | static void module_unload_init(struct module *mod) | |
523 | { | |
720eba31 | 524 | int cpu; |
1da177e4 | 525 | |
2c02dfe7 LT |
526 | INIT_LIST_HEAD(&mod->source_list); |
527 | INIT_LIST_HEAD(&mod->target_list); | |
5fbfb18d NP |
528 | for_each_possible_cpu(cpu) { |
529 | per_cpu_ptr(mod->refptr, cpu)->incs = 0; | |
530 | per_cpu_ptr(mod->refptr, cpu)->decs = 0; | |
531 | } | |
e1783a24 | 532 | |
1da177e4 | 533 | /* Hold reference count during initialization. */ |
5fbfb18d | 534 | __this_cpu_write(mod->refptr->incs, 1); |
1da177e4 LT |
535 | /* Backwards compatibility macros put refcount during init. */ |
536 | mod->waiter = current; | |
537 | } | |
538 | ||
1da177e4 LT |
539 | /* Does a already use b? */ |
540 | static int already_uses(struct module *a, struct module *b) | |
541 | { | |
542 | struct module_use *use; | |
543 | ||
2c02dfe7 LT |
544 | list_for_each_entry(use, &b->source_list, source_list) { |
545 | if (use->source == a) { | |
1da177e4 LT |
546 | DEBUGP("%s uses %s!\n", a->name, b->name); |
547 | return 1; | |
548 | } | |
549 | } | |
550 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
551 | return 0; | |
552 | } | |
553 | ||
2c02dfe7 LT |
554 | /* |
555 | * Module a uses b | |
556 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
557 | * - the module_use is added to the list of 'b' sources (so | |
558 | * 'b' can walk the list to see who sourced them), and of 'a' | |
559 | * targets (so 'a' can see what modules it targets). | |
560 | */ | |
561 | static int add_module_usage(struct module *a, struct module *b) | |
562 | { | |
2c02dfe7 LT |
563 | struct module_use *use; |
564 | ||
565 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
566 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
567 | if (!use) { | |
568 | printk(KERN_WARNING "%s: out of memory loading\n", a->name); | |
569 | return -ENOMEM; | |
570 | } | |
571 | ||
572 | use->source = a; | |
573 | use->target = b; | |
574 | list_add(&use->source_list, &b->source_list); | |
575 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
576 | return 0; |
577 | } | |
578 | ||
1da177e4 | 579 | /* Module a uses b */ |
c6b37801 | 580 | int use_module(struct module *a, struct module *b) |
1da177e4 | 581 | { |
c8e21ced | 582 | int err; |
270a6c4c | 583 | |
218ce735 | 584 | if (b == NULL || already_uses(a, b)) return 1; |
c9a3ba55 | 585 | |
480b02df | 586 | /* If we're interrupted or time out, we fail. */ |
218ce735 LT |
587 | if (wait_event_interruptible_timeout( |
588 | module_wq, (err = strong_try_module_get(b)) != -EBUSY, | |
589 | 30 * HZ) <= 0) { | |
590 | printk("%s: gave up waiting for init of module %s.\n", | |
591 | a->name, b->name); | |
592 | return 0; | |
593 | } | |
594 | ||
595 | /* If strong_try_module_get() returned a different error, we fail. */ | |
c9a3ba55 | 596 | if (err) |
218ce735 | 597 | return 0; |
1da177e4 | 598 | |
2c02dfe7 LT |
599 | err = add_module_usage(a, b); |
600 | if (err) { | |
1da177e4 | 601 | module_put(b); |
218ce735 | 602 | return 0; |
1da177e4 | 603 | } |
218ce735 | 604 | return 1; |
1da177e4 | 605 | } |
c6b37801 | 606 | EXPORT_SYMBOL_GPL(use_module); |
1da177e4 LT |
607 | |
608 | /* Clear the unload stuff of the module. */ | |
609 | static void module_unload_free(struct module *mod) | |
610 | { | |
2c02dfe7 | 611 | struct module_use *use, *tmp; |
1da177e4 | 612 | |
2c02dfe7 LT |
613 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
614 | struct module *i = use->target; | |
615 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
616 | module_put(i); | |
617 | list_del(&use->source_list); | |
618 | list_del(&use->target_list); | |
619 | kfree(use); | |
1da177e4 LT |
620 | } |
621 | } | |
622 | ||
623 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 624 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
625 | { |
626 | int ret = (flags & O_TRUNC); | |
627 | if (ret) | |
fb169793 | 628 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
629 | return ret; |
630 | } | |
631 | #else | |
fb169793 | 632 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
633 | { |
634 | return 0; | |
635 | } | |
636 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
637 | ||
638 | struct stopref | |
639 | { | |
640 | struct module *mod; | |
641 | int flags; | |
642 | int *forced; | |
643 | }; | |
644 | ||
645 | /* Whole machine is stopped with interrupts off when this runs. */ | |
646 | static int __try_stop_module(void *_sref) | |
647 | { | |
648 | struct stopref *sref = _sref; | |
649 | ||
da39ba5e RR |
650 | /* If it's not unused, quit unless we're forcing. */ |
651 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 652 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
653 | return -EWOULDBLOCK; |
654 | } | |
655 | ||
656 | /* Mark it as dying. */ | |
657 | sref->mod->state = MODULE_STATE_GOING; | |
658 | return 0; | |
659 | } | |
660 | ||
661 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
662 | { | |
da39ba5e RR |
663 | if (flags & O_NONBLOCK) { |
664 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 665 | |
9b1a4d38 | 666 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
667 | } else { |
668 | /* We don't need to stop the machine for this. */ | |
669 | mod->state = MODULE_STATE_GOING; | |
670 | synchronize_sched(); | |
671 | return 0; | |
672 | } | |
1da177e4 LT |
673 | } |
674 | ||
675 | unsigned int module_refcount(struct module *mod) | |
676 | { | |
5fbfb18d | 677 | unsigned int incs = 0, decs = 0; |
720eba31 | 678 | int cpu; |
1da177e4 | 679 | |
720eba31 | 680 | for_each_possible_cpu(cpu) |
5fbfb18d NP |
681 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
682 | /* | |
683 | * ensure the incs are added up after the decs. | |
684 | * module_put ensures incs are visible before decs with smp_wmb. | |
685 | * | |
686 | * This 2-count scheme avoids the situation where the refcount | |
687 | * for CPU0 is read, then CPU0 increments the module refcount, | |
688 | * then CPU1 drops that refcount, then the refcount for CPU1 is | |
689 | * read. We would record a decrement but not its corresponding | |
690 | * increment so we would see a low count (disaster). | |
691 | * | |
692 | * Rare situation? But module_refcount can be preempted, and we | |
693 | * might be tallying up 4096+ CPUs. So it is not impossible. | |
694 | */ | |
695 | smp_rmb(); | |
696 | for_each_possible_cpu(cpu) | |
697 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; | |
698 | return incs - decs; | |
1da177e4 LT |
699 | } |
700 | EXPORT_SYMBOL(module_refcount); | |
701 | ||
702 | /* This exists whether we can unload or not */ | |
703 | static void free_module(struct module *mod); | |
704 | ||
705 | static void wait_for_zero_refcount(struct module *mod) | |
706 | { | |
a6550207 | 707 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 708 | mutex_unlock(&module_mutex); |
1da177e4 LT |
709 | for (;;) { |
710 | DEBUGP("Looking at refcount...\n"); | |
711 | set_current_state(TASK_UNINTERRUPTIBLE); | |
712 | if (module_refcount(mod) == 0) | |
713 | break; | |
714 | schedule(); | |
715 | } | |
716 | current->state = TASK_RUNNING; | |
6389a385 | 717 | mutex_lock(&module_mutex); |
1da177e4 LT |
718 | } |
719 | ||
17da2bd9 HC |
720 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
721 | unsigned int, flags) | |
1da177e4 LT |
722 | { |
723 | struct module *mod; | |
dfff0a06 | 724 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
725 | int ret, forced = 0; |
726 | ||
3d43321b | 727 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
728 | return -EPERM; |
729 | ||
730 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
731 | return -EFAULT; | |
732 | name[MODULE_NAME_LEN-1] = '\0'; | |
733 | ||
3fc1f1e2 TH |
734 | if (mutex_lock_interruptible(&module_mutex) != 0) |
735 | return -EINTR; | |
1da177e4 LT |
736 | |
737 | mod = find_module(name); | |
738 | if (!mod) { | |
739 | ret = -ENOENT; | |
740 | goto out; | |
741 | } | |
742 | ||
2c02dfe7 | 743 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
744 | /* Other modules depend on us: get rid of them first. */ |
745 | ret = -EWOULDBLOCK; | |
746 | goto out; | |
747 | } | |
748 | ||
749 | /* Doing init or already dying? */ | |
750 | if (mod->state != MODULE_STATE_LIVE) { | |
751 | /* FIXME: if (force), slam module count and wake up | |
752 | waiter --RR */ | |
753 | DEBUGP("%s already dying\n", mod->name); | |
754 | ret = -EBUSY; | |
755 | goto out; | |
756 | } | |
757 | ||
758 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 759 | if (mod->init && !mod->exit) { |
fb169793 | 760 | forced = try_force_unload(flags); |
1da177e4 LT |
761 | if (!forced) { |
762 | /* This module can't be removed */ | |
763 | ret = -EBUSY; | |
764 | goto out; | |
765 | } | |
766 | } | |
767 | ||
768 | /* Set this up before setting mod->state */ | |
769 | mod->waiter = current; | |
770 | ||
771 | /* Stop the machine so refcounts can't move and disable module. */ | |
772 | ret = try_stop_module(mod, flags, &forced); | |
773 | if (ret != 0) | |
774 | goto out; | |
775 | ||
776 | /* Never wait if forced. */ | |
777 | if (!forced && module_refcount(mod) != 0) | |
778 | wait_for_zero_refcount(mod); | |
779 | ||
df4b565e | 780 | mutex_unlock(&module_mutex); |
1da177e4 | 781 | /* Final destruction now noone is using it. */ |
df4b565e | 782 | if (mod->exit != NULL) |
1da177e4 | 783 | mod->exit(); |
df4b565e PO |
784 | blocking_notifier_call_chain(&module_notify_list, |
785 | MODULE_STATE_GOING, mod); | |
22a9d645 | 786 | async_synchronize_full(); |
df4b565e | 787 | mutex_lock(&module_mutex); |
e14af7ee | 788 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 789 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
e9d376f0 | 790 | ddebug_remove_module(mod->name); |
1da177e4 LT |
791 | free_module(mod); |
792 | ||
793 | out: | |
6389a385 | 794 | mutex_unlock(&module_mutex); |
1da177e4 LT |
795 | return ret; |
796 | } | |
797 | ||
d1e99d7a | 798 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
799 | { |
800 | struct module_use *use; | |
801 | int printed_something = 0; | |
802 | ||
803 | seq_printf(m, " %u ", module_refcount(mod)); | |
804 | ||
805 | /* Always include a trailing , so userspace can differentiate | |
806 | between this and the old multi-field proc format. */ | |
2c02dfe7 | 807 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 808 | printed_something = 1; |
2c02dfe7 | 809 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
810 | } |
811 | ||
1da177e4 LT |
812 | if (mod->init != NULL && mod->exit == NULL) { |
813 | printed_something = 1; | |
814 | seq_printf(m, "[permanent],"); | |
815 | } | |
816 | ||
817 | if (!printed_something) | |
818 | seq_printf(m, "-"); | |
819 | } | |
820 | ||
821 | void __symbol_put(const char *symbol) | |
822 | { | |
823 | struct module *owner; | |
1da177e4 | 824 | |
24da1cbf | 825 | preempt_disable(); |
414fd31b | 826 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
827 | BUG(); |
828 | module_put(owner); | |
24da1cbf | 829 | preempt_enable(); |
1da177e4 LT |
830 | } |
831 | EXPORT_SYMBOL(__symbol_put); | |
832 | ||
7d1d16e4 | 833 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
834 | void symbol_put_addr(void *addr) |
835 | { | |
5e376613 | 836 | struct module *modaddr; |
7d1d16e4 | 837 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 838 | |
7d1d16e4 | 839 | if (core_kernel_text(a)) |
5e376613 | 840 | return; |
1da177e4 | 841 | |
a6e6abd5 RR |
842 | /* module_text_address is safe here: we're supposed to have reference |
843 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 844 | modaddr = __module_text_address(a); |
a6e6abd5 | 845 | BUG_ON(!modaddr); |
5e376613 | 846 | module_put(modaddr); |
1da177e4 LT |
847 | } |
848 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
849 | ||
850 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
851 | struct module *mod, char *buffer) | |
852 | { | |
256e2fdf | 853 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
854 | } |
855 | ||
856 | static struct module_attribute refcnt = { | |
7b595756 | 857 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
858 | .show = show_refcnt, |
859 | }; | |
860 | ||
f6a57033 AV |
861 | void module_put(struct module *module) |
862 | { | |
863 | if (module) { | |
e1783a24 | 864 | preempt_disable(); |
5fbfb18d NP |
865 | smp_wmb(); /* see comment in module_refcount */ |
866 | __this_cpu_inc(module->refptr->decs); | |
e1783a24 | 867 | |
ae832d1e | 868 | trace_module_put(module, _RET_IP_); |
f6a57033 AV |
869 | /* Maybe they're waiting for us to drop reference? */ |
870 | if (unlikely(!module_is_live(module))) | |
871 | wake_up_process(module->waiter); | |
e1783a24 | 872 | preempt_enable(); |
f6a57033 AV |
873 | } |
874 | } | |
875 | EXPORT_SYMBOL(module_put); | |
876 | ||
1da177e4 | 877 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 878 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
879 | { |
880 | /* We don't know the usage count, or what modules are using. */ | |
881 | seq_printf(m, " - -"); | |
882 | } | |
883 | ||
884 | static inline void module_unload_free(struct module *mod) | |
885 | { | |
886 | } | |
887 | ||
c6b37801 | 888 | int use_module(struct module *a, struct module *b) |
1da177e4 | 889 | { |
218ce735 | 890 | return strong_try_module_get(b) == 0; |
1da177e4 | 891 | } |
c6b37801 | 892 | EXPORT_SYMBOL_GPL(use_module); |
1da177e4 LT |
893 | |
894 | static inline void module_unload_init(struct module *mod) | |
895 | { | |
896 | } | |
897 | #endif /* CONFIG_MODULE_UNLOAD */ | |
898 | ||
1f71740a KS |
899 | static ssize_t show_initstate(struct module_attribute *mattr, |
900 | struct module *mod, char *buffer) | |
901 | { | |
902 | const char *state = "unknown"; | |
903 | ||
904 | switch (mod->state) { | |
905 | case MODULE_STATE_LIVE: | |
906 | state = "live"; | |
907 | break; | |
908 | case MODULE_STATE_COMING: | |
909 | state = "coming"; | |
910 | break; | |
911 | case MODULE_STATE_GOING: | |
912 | state = "going"; | |
913 | break; | |
914 | } | |
915 | return sprintf(buffer, "%s\n", state); | |
916 | } | |
917 | ||
918 | static struct module_attribute initstate = { | |
7b595756 | 919 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
920 | .show = show_initstate, |
921 | }; | |
922 | ||
03e88ae1 GKH |
923 | static struct module_attribute *modinfo_attrs[] = { |
924 | &modinfo_version, | |
925 | &modinfo_srcversion, | |
1f71740a | 926 | &initstate, |
03e88ae1 GKH |
927 | #ifdef CONFIG_MODULE_UNLOAD |
928 | &refcnt, | |
929 | #endif | |
930 | NULL, | |
931 | }; | |
932 | ||
1da177e4 LT |
933 | static const char vermagic[] = VERMAGIC_STRING; |
934 | ||
c6e665c8 | 935 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
936 | { |
937 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 938 | if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8 RR |
939 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
940 | mod->name, reason); | |
826e4506 LT |
941 | add_taint_module(mod, TAINT_FORCED_MODULE); |
942 | return 0; | |
943 | #else | |
944 | return -ENOEXEC; | |
945 | #endif | |
946 | } | |
947 | ||
1da177e4 | 948 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
949 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
950 | static unsigned long maybe_relocated(unsigned long crc, | |
951 | const struct module *crc_owner) | |
952 | { | |
953 | #ifdef ARCH_RELOCATES_KCRCTAB | |
954 | if (crc_owner == NULL) | |
955 | return crc - (unsigned long)reloc_start; | |
956 | #endif | |
957 | return crc; | |
958 | } | |
959 | ||
1da177e4 LT |
960 | static int check_version(Elf_Shdr *sechdrs, |
961 | unsigned int versindex, | |
962 | const char *symname, | |
963 | struct module *mod, | |
d4703aef RR |
964 | const unsigned long *crc, |
965 | const struct module *crc_owner) | |
1da177e4 LT |
966 | { |
967 | unsigned int i, num_versions; | |
968 | struct modversion_info *versions; | |
969 | ||
970 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
971 | if (!crc) | |
972 | return 1; | |
973 | ||
a5dd6970 RR |
974 | /* No versions at all? modprobe --force does this. */ |
975 | if (versindex == 0) | |
976 | return try_to_force_load(mod, symname) == 0; | |
977 | ||
1da177e4 LT |
978 | versions = (void *) sechdrs[versindex].sh_addr; |
979 | num_versions = sechdrs[versindex].sh_size | |
980 | / sizeof(struct modversion_info); | |
981 | ||
982 | for (i = 0; i < num_versions; i++) { | |
983 | if (strcmp(versions[i].name, symname) != 0) | |
984 | continue; | |
985 | ||
d4703aef | 986 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 987 | return 1; |
1da177e4 | 988 | DEBUGP("Found checksum %lX vs module %lX\n", |
d4703aef | 989 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 990 | goto bad_version; |
1da177e4 | 991 | } |
826e4506 | 992 | |
a5dd6970 RR |
993 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
994 | mod->name, symname); | |
995 | return 0; | |
826e4506 LT |
996 | |
997 | bad_version: | |
998 | printk("%s: disagrees about version of symbol %s\n", | |
999 | mod->name, symname); | |
1000 | return 0; | |
1da177e4 LT |
1001 | } |
1002 | ||
1003 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1004 | unsigned int versindex, | |
1005 | struct module *mod) | |
1006 | { | |
1007 | const unsigned long *crc; | |
1da177e4 | 1008 | |
6560dc16 MF |
1009 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
1010 | &crc, true, false)) | |
1da177e4 | 1011 | BUG(); |
d4703aef RR |
1012 | return check_version(sechdrs, versindex, "module_layout", mod, crc, |
1013 | NULL); | |
1da177e4 LT |
1014 | } |
1015 | ||
91e37a79 RR |
1016 | /* First part is kernel version, which we ignore if module has crcs. */ |
1017 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1018 | bool has_crcs) | |
1da177e4 | 1019 | { |
91e37a79 RR |
1020 | if (has_crcs) { |
1021 | amagic += strcspn(amagic, " "); | |
1022 | bmagic += strcspn(bmagic, " "); | |
1023 | } | |
1da177e4 LT |
1024 | return strcmp(amagic, bmagic) == 0; |
1025 | } | |
1026 | #else | |
1027 | static inline int check_version(Elf_Shdr *sechdrs, | |
1028 | unsigned int versindex, | |
1029 | const char *symname, | |
1030 | struct module *mod, | |
d4703aef RR |
1031 | const unsigned long *crc, |
1032 | const struct module *crc_owner) | |
1da177e4 LT |
1033 | { |
1034 | return 1; | |
1035 | } | |
1036 | ||
1037 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1038 | unsigned int versindex, | |
1039 | struct module *mod) | |
1040 | { | |
1041 | return 1; | |
1042 | } | |
1043 | ||
91e37a79 RR |
1044 | static inline int same_magic(const char *amagic, const char *bmagic, |
1045 | bool has_crcs) | |
1da177e4 LT |
1046 | { |
1047 | return strcmp(amagic, bmagic) == 0; | |
1048 | } | |
1049 | #endif /* CONFIG_MODVERSIONS */ | |
1050 | ||
1051 | /* Resolve a symbol for this module. I.e. if we find one, record usage. | |
1052 | Must be holding module_mutex. */ | |
414fd31b TA |
1053 | static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs, |
1054 | unsigned int versindex, | |
1055 | const char *name, | |
1056 | struct module *mod) | |
1da177e4 LT |
1057 | { |
1058 | struct module *owner; | |
414fd31b | 1059 | const struct kernel_symbol *sym; |
1da177e4 LT |
1060 | const unsigned long *crc; |
1061 | ||
414fd31b | 1062 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1063 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
218ce735 LT |
1064 | /* use_module can fail due to OOM, |
1065 | or module initialization or unloading */ | |
1066 | if (sym) { | |
1067 | if (!check_version(sechdrs, versindex, name, mod, crc, owner) | |
1068 | || !use_module(mod, owner)) | |
1069 | sym = NULL; | |
1da177e4 | 1070 | } |
218ce735 | 1071 | return sym; |
1da177e4 LT |
1072 | } |
1073 | ||
1da177e4 LT |
1074 | /* |
1075 | * /sys/module/foo/sections stuff | |
1076 | * J. Corbet <corbet@lwn.net> | |
1077 | */ | |
120fc3d7 | 1078 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
10b465aa BH |
1079 | |
1080 | static inline bool sect_empty(const Elf_Shdr *sect) | |
1081 | { | |
1082 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1083 | } | |
1084 | ||
a58730c4 RR |
1085 | struct module_sect_attr |
1086 | { | |
1087 | struct module_attribute mattr; | |
1088 | char *name; | |
1089 | unsigned long address; | |
1090 | }; | |
1091 | ||
1092 | struct module_sect_attrs | |
1093 | { | |
1094 | struct attribute_group grp; | |
1095 | unsigned int nsections; | |
1096 | struct module_sect_attr attrs[0]; | |
1097 | }; | |
1098 | ||
1da177e4 LT |
1099 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1100 | struct module *mod, char *buf) | |
1101 | { | |
1102 | struct module_sect_attr *sattr = | |
1103 | container_of(mattr, struct module_sect_attr, mattr); | |
1104 | return sprintf(buf, "0x%lx\n", sattr->address); | |
1105 | } | |
1106 | ||
04b1db9f IN |
1107 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1108 | { | |
a58730c4 | 1109 | unsigned int section; |
04b1db9f IN |
1110 | |
1111 | for (section = 0; section < sect_attrs->nsections; section++) | |
1112 | kfree(sect_attrs->attrs[section].name); | |
1113 | kfree(sect_attrs); | |
1114 | } | |
1115 | ||
1da177e4 LT |
1116 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1117 | char *secstrings, Elf_Shdr *sechdrs) | |
1118 | { | |
1119 | unsigned int nloaded = 0, i, size[2]; | |
1120 | struct module_sect_attrs *sect_attrs; | |
1121 | struct module_sect_attr *sattr; | |
1122 | struct attribute **gattr; | |
22a8bdeb | 1123 | |
1da177e4 LT |
1124 | /* Count loaded sections and allocate structures */ |
1125 | for (i = 0; i < nsect; i++) | |
10b465aa | 1126 | if (!sect_empty(&sechdrs[i])) |
1da177e4 LT |
1127 | nloaded++; |
1128 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1129 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1130 | sizeof(sect_attrs->grp.attrs[0])); | |
1131 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1132 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1133 | if (sect_attrs == NULL) | |
1da177e4 LT |
1134 | return; |
1135 | ||
1136 | /* Setup section attributes. */ | |
1137 | sect_attrs->grp.name = "sections"; | |
1138 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1139 | ||
04b1db9f | 1140 | sect_attrs->nsections = 0; |
1da177e4 LT |
1141 | sattr = §_attrs->attrs[0]; |
1142 | gattr = §_attrs->grp.attrs[0]; | |
1143 | for (i = 0; i < nsect; i++) { | |
10b465aa | 1144 | if (sect_empty(&sechdrs[i])) |
35dead42 | 1145 | continue; |
1da177e4 | 1146 | sattr->address = sechdrs[i].sh_addr; |
04b1db9f IN |
1147 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1148 | GFP_KERNEL); | |
1149 | if (sattr->name == NULL) | |
1150 | goto out; | |
1151 | sect_attrs->nsections++; | |
361795b1 | 1152 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1153 | sattr->mattr.show = module_sect_show; |
1154 | sattr->mattr.store = NULL; | |
1155 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1156 | sattr->mattr.attr.mode = S_IRUGO; |
1157 | *(gattr++) = &(sattr++)->mattr.attr; | |
1158 | } | |
1159 | *gattr = NULL; | |
1160 | ||
1161 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1162 | goto out; | |
1163 | ||
1164 | mod->sect_attrs = sect_attrs; | |
1165 | return; | |
1166 | out: | |
04b1db9f | 1167 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1168 | } |
1169 | ||
1170 | static void remove_sect_attrs(struct module *mod) | |
1171 | { | |
1172 | if (mod->sect_attrs) { | |
1173 | sysfs_remove_group(&mod->mkobj.kobj, | |
1174 | &mod->sect_attrs->grp); | |
1175 | /* We are positive that no one is using any sect attrs | |
1176 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1177 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1178 | mod->sect_attrs = NULL; |
1179 | } | |
1180 | } | |
1181 | ||
6d760133 RM |
1182 | /* |
1183 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1184 | */ | |
1185 | ||
1186 | struct module_notes_attrs { | |
1187 | struct kobject *dir; | |
1188 | unsigned int notes; | |
1189 | struct bin_attribute attrs[0]; | |
1190 | }; | |
1191 | ||
2c3c8bea | 1192 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1193 | struct bin_attribute *bin_attr, |
1194 | char *buf, loff_t pos, size_t count) | |
1195 | { | |
1196 | /* | |
1197 | * The caller checked the pos and count against our size. | |
1198 | */ | |
1199 | memcpy(buf, bin_attr->private + pos, count); | |
1200 | return count; | |
1201 | } | |
1202 | ||
1203 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1204 | unsigned int i) | |
1205 | { | |
1206 | if (notes_attrs->dir) { | |
1207 | while (i-- > 0) | |
1208 | sysfs_remove_bin_file(notes_attrs->dir, | |
1209 | ¬es_attrs->attrs[i]); | |
e9432093 | 1210 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1211 | } |
1212 | kfree(notes_attrs); | |
1213 | } | |
1214 | ||
1215 | static void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1216 | char *secstrings, Elf_Shdr *sechdrs) | |
1217 | { | |
1218 | unsigned int notes, loaded, i; | |
1219 | struct module_notes_attrs *notes_attrs; | |
1220 | struct bin_attribute *nattr; | |
1221 | ||
ea6bff36 IM |
1222 | /* failed to create section attributes, so can't create notes */ |
1223 | if (!mod->sect_attrs) | |
1224 | return; | |
1225 | ||
6d760133 RM |
1226 | /* Count notes sections and allocate structures. */ |
1227 | notes = 0; | |
1228 | for (i = 0; i < nsect; i++) | |
10b465aa | 1229 | if (!sect_empty(&sechdrs[i]) && |
6d760133 RM |
1230 | (sechdrs[i].sh_type == SHT_NOTE)) |
1231 | ++notes; | |
1232 | ||
1233 | if (notes == 0) | |
1234 | return; | |
1235 | ||
1236 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1237 | + notes * sizeof(notes_attrs->attrs[0]), | |
1238 | GFP_KERNEL); | |
1239 | if (notes_attrs == NULL) | |
1240 | return; | |
1241 | ||
1242 | notes_attrs->notes = notes; | |
1243 | nattr = ¬es_attrs->attrs[0]; | |
1244 | for (loaded = i = 0; i < nsect; ++i) { | |
10b465aa | 1245 | if (sect_empty(&sechdrs[i])) |
6d760133 RM |
1246 | continue; |
1247 | if (sechdrs[i].sh_type == SHT_NOTE) { | |
361795b1 | 1248 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1249 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1250 | nattr->attr.mode = S_IRUGO; | |
1251 | nattr->size = sechdrs[i].sh_size; | |
1252 | nattr->private = (void *) sechdrs[i].sh_addr; | |
1253 | nattr->read = module_notes_read; | |
1254 | ++nattr; | |
1255 | } | |
1256 | ++loaded; | |
1257 | } | |
1258 | ||
4ff6abff | 1259 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1260 | if (!notes_attrs->dir) |
1261 | goto out; | |
1262 | ||
1263 | for (i = 0; i < notes; ++i) | |
1264 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1265 | ¬es_attrs->attrs[i])) | |
1266 | goto out; | |
1267 | ||
1268 | mod->notes_attrs = notes_attrs; | |
1269 | return; | |
1270 | ||
1271 | out: | |
1272 | free_notes_attrs(notes_attrs, i); | |
1273 | } | |
1274 | ||
1275 | static void remove_notes_attrs(struct module *mod) | |
1276 | { | |
1277 | if (mod->notes_attrs) | |
1278 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1279 | } | |
1280 | ||
1da177e4 | 1281 | #else |
04b1db9f | 1282 | |
1da177e4 LT |
1283 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1284 | char *sectstrings, Elf_Shdr *sechdrs) | |
1285 | { | |
1286 | } | |
1287 | ||
1288 | static inline void remove_sect_attrs(struct module *mod) | |
1289 | { | |
1290 | } | |
6d760133 RM |
1291 | |
1292 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1293 | char *sectstrings, Elf_Shdr *sechdrs) | |
1294 | { | |
1295 | } | |
1296 | ||
1297 | static inline void remove_notes_attrs(struct module *mod) | |
1298 | { | |
1299 | } | |
120fc3d7 | 1300 | #endif |
1da177e4 | 1301 | |
ef665c1a | 1302 | #ifdef CONFIG_SYSFS |
80a3d1bb RR |
1303 | static void add_usage_links(struct module *mod) |
1304 | { | |
1305 | #ifdef CONFIG_MODULE_UNLOAD | |
1306 | struct module_use *use; | |
1307 | int nowarn; | |
1308 | ||
1309 | list_for_each_entry(use, &mod->target_list, target_list) { | |
1310 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1311 | &mod->mkobj.kobj, mod->name); | |
1312 | } | |
1313 | #endif | |
1314 | } | |
1315 | ||
1316 | static void del_usage_links(struct module *mod) | |
1317 | { | |
1318 | #ifdef CONFIG_MODULE_UNLOAD | |
1319 | struct module_use *use; | |
1320 | ||
1321 | list_for_each_entry(use, &mod->target_list, target_list) | |
1322 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
1323 | #endif | |
1324 | } | |
1325 | ||
ef665c1a | 1326 | int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1327 | { |
1328 | struct module_attribute *attr; | |
03e88ae1 | 1329 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1330 | int error = 0; |
1331 | int i; | |
1332 | ||
03e88ae1 GKH |
1333 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1334 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1335 | GFP_KERNEL); | |
1336 | if (!mod->modinfo_attrs) | |
1337 | return -ENOMEM; | |
1338 | ||
1339 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1340 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1341 | if (!attr->test || | |
03e88ae1 GKH |
1342 | (attr->test && attr->test(mod))) { |
1343 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1344 | sysfs_attr_init(&temp_attr->attr); |
03e88ae1 GKH |
1345 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1346 | ++temp_attr; | |
1347 | } | |
c988d2b2 MD |
1348 | } |
1349 | return error; | |
1350 | } | |
1351 | ||
ef665c1a | 1352 | void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1353 | { |
1354 | struct module_attribute *attr; | |
1355 | int i; | |
1356 | ||
03e88ae1 GKH |
1357 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1358 | /* pick a field to test for end of list */ | |
1359 | if (!attr->attr.name) | |
1360 | break; | |
c988d2b2 | 1361 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1362 | if (attr->free) |
1363 | attr->free(mod); | |
c988d2b2 | 1364 | } |
03e88ae1 | 1365 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1366 | } |
1da177e4 | 1367 | |
ef665c1a | 1368 | int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1369 | { |
1370 | int err; | |
6494a93d | 1371 | struct kobject *kobj; |
1da177e4 | 1372 | |
823bccfc GKH |
1373 | if (!module_sysfs_initialized) { |
1374 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1375 | mod->name); |
1376 | err = -EINVAL; | |
1377 | goto out; | |
1378 | } | |
6494a93d GKH |
1379 | |
1380 | kobj = kset_find_obj(module_kset, mod->name); | |
1381 | if (kobj) { | |
1382 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1383 | kobject_put(kobj); | |
1384 | err = -EINVAL; | |
1385 | goto out; | |
1386 | } | |
1387 | ||
1da177e4 | 1388 | mod->mkobj.mod = mod; |
e17e0f51 | 1389 | |
ac3c8141 GKH |
1390 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1391 | mod->mkobj.kobj.kset = module_kset; | |
1392 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1393 | "%s", mod->name); | |
1394 | if (err) | |
1395 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1396 | |
97c146ef | 1397 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1398 | out: |
1399 | return err; | |
1400 | } | |
1401 | ||
ef665c1a | 1402 | int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1403 | struct kernel_param *kparam, |
1404 | unsigned int num_params) | |
1405 | { | |
1406 | int err; | |
1407 | ||
80a3d1bb RR |
1408 | err = mod_sysfs_init(mod); |
1409 | if (err) | |
1410 | goto out; | |
1411 | ||
4ff6abff | 1412 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1413 | if (!mod->holders_dir) { |
1414 | err = -ENOMEM; | |
270a6c4c | 1415 | goto out_unreg; |
240936e1 | 1416 | } |
270a6c4c | 1417 | |
1da177e4 LT |
1418 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1419 | if (err) | |
270a6c4c | 1420 | goto out_unreg_holders; |
1da177e4 | 1421 | |
c988d2b2 MD |
1422 | err = module_add_modinfo_attrs(mod); |
1423 | if (err) | |
e17e0f51 | 1424 | goto out_unreg_param; |
c988d2b2 | 1425 | |
80a3d1bb RR |
1426 | add_usage_links(mod); |
1427 | ||
e17e0f51 | 1428 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1429 | return 0; |
1430 | ||
e17e0f51 KS |
1431 | out_unreg_param: |
1432 | module_param_sysfs_remove(mod); | |
270a6c4c | 1433 | out_unreg_holders: |
78a2d906 | 1434 | kobject_put(mod->holders_dir); |
270a6c4c | 1435 | out_unreg: |
e17e0f51 | 1436 | kobject_put(&mod->mkobj.kobj); |
80a3d1bb | 1437 | out: |
1da177e4 LT |
1438 | return err; |
1439 | } | |
34e4e2fe DL |
1440 | |
1441 | static void mod_sysfs_fini(struct module *mod) | |
1442 | { | |
1443 | kobject_put(&mod->mkobj.kobj); | |
1444 | } | |
1445 | ||
1446 | #else /* CONFIG_SYSFS */ | |
1447 | ||
1448 | static void mod_sysfs_fini(struct module *mod) | |
1449 | { | |
1450 | } | |
1451 | ||
80a3d1bb RR |
1452 | static void del_usage_links(struct module *mod) |
1453 | { | |
1454 | } | |
1455 | ||
34e4e2fe | 1456 | #endif /* CONFIG_SYSFS */ |
1da177e4 LT |
1457 | |
1458 | static void mod_kobject_remove(struct module *mod) | |
1459 | { | |
80a3d1bb | 1460 | del_usage_links(mod); |
c988d2b2 | 1461 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1462 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1463 | kobject_put(mod->mkobj.drivers_dir); |
1464 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1465 | mod_sysfs_fini(mod); |
1da177e4 LT |
1466 | } |
1467 | ||
1468 | /* | |
1469 | * unlink the module with the whole machine is stopped with interrupts off | |
1470 | * - this defends against kallsyms not taking locks | |
1471 | */ | |
1472 | static int __unlink_module(void *_mod) | |
1473 | { | |
1474 | struct module *mod = _mod; | |
1475 | list_del(&mod->list); | |
1476 | return 0; | |
1477 | } | |
1478 | ||
02a3e59a | 1479 | /* Free a module, remove from lists, etc (must hold module_mutex). */ |
1da177e4 LT |
1480 | static void free_module(struct module *mod) |
1481 | { | |
7ead8b83 LZ |
1482 | trace_module_free(mod); |
1483 | ||
1da177e4 | 1484 | /* Delete from various lists */ |
9b1a4d38 | 1485 | stop_machine(__unlink_module, mod, NULL); |
6d760133 | 1486 | remove_notes_attrs(mod); |
1da177e4 LT |
1487 | remove_sect_attrs(mod); |
1488 | mod_kobject_remove(mod); | |
1489 | ||
1490 | /* Arch-specific cleanup. */ | |
1491 | module_arch_cleanup(mod); | |
1492 | ||
1493 | /* Module unload stuff */ | |
1494 | module_unload_free(mod); | |
1495 | ||
e180a6b7 RR |
1496 | /* Free any allocated parameters. */ |
1497 | destroy_params(mod->kp, mod->num_kp); | |
1498 | ||
1da177e4 LT |
1499 | /* This may be NULL, but that's OK */ |
1500 | module_free(mod, mod->module_init); | |
1501 | kfree(mod->args); | |
259354de | 1502 | percpu_modfree(mod); |
e1783a24 | 1503 | #if defined(CONFIG_MODULE_UNLOAD) |
720eba31 | 1504 | if (mod->refptr) |
e1783a24 | 1505 | free_percpu(mod->refptr); |
720eba31 | 1506 | #endif |
fbb9ce95 IM |
1507 | /* Free lock-classes: */ |
1508 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1509 | ||
1da177e4 LT |
1510 | /* Finally, free the core (containing the module structure) */ |
1511 | module_free(mod, mod->module_core); | |
eb8cdec4 BS |
1512 | |
1513 | #ifdef CONFIG_MPU | |
1514 | update_protections(current->mm); | |
1515 | #endif | |
1da177e4 LT |
1516 | } |
1517 | ||
1518 | void *__symbol_get(const char *symbol) | |
1519 | { | |
1520 | struct module *owner; | |
414fd31b | 1521 | const struct kernel_symbol *sym; |
1da177e4 | 1522 | |
24da1cbf | 1523 | preempt_disable(); |
414fd31b TA |
1524 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1525 | if (sym && strong_try_module_get(owner)) | |
1526 | sym = NULL; | |
24da1cbf | 1527 | preempt_enable(); |
1da177e4 | 1528 | |
414fd31b | 1529 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1530 | } |
1531 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1532 | ||
eea8b54d AN |
1533 | /* |
1534 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1535 | * in the kernel or in some other module's exported symbol table. |
eea8b54d AN |
1536 | */ |
1537 | static int verify_export_symbols(struct module *mod) | |
1538 | { | |
b211104d | 1539 | unsigned int i; |
eea8b54d | 1540 | struct module *owner; |
b211104d RR |
1541 | const struct kernel_symbol *s; |
1542 | struct { | |
1543 | const struct kernel_symbol *sym; | |
1544 | unsigned int num; | |
1545 | } arr[] = { | |
1546 | { mod->syms, mod->num_syms }, | |
1547 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1548 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1549 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1550 | { mod->unused_syms, mod->num_unused_syms }, |
1551 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1552 | #endif |
b211104d | 1553 | }; |
eea8b54d | 1554 | |
b211104d RR |
1555 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1556 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
414fd31b | 1557 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d RR |
1558 | printk(KERN_ERR |
1559 | "%s: exports duplicate symbol %s" | |
1560 | " (owned by %s)\n", | |
1561 | mod->name, s->name, module_name(owner)); | |
1562 | return -ENOEXEC; | |
1563 | } | |
eea8b54d | 1564 | } |
b211104d RR |
1565 | } |
1566 | return 0; | |
eea8b54d AN |
1567 | } |
1568 | ||
9a4b9708 | 1569 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4 LT |
1570 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1571 | unsigned int symindex, | |
1572 | const char *strtab, | |
1573 | unsigned int versindex, | |
1574 | unsigned int pcpuindex, | |
1575 | struct module *mod) | |
1576 | { | |
1577 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1578 | unsigned long secbase; | |
1579 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1580 | int ret = 0; | |
414fd31b | 1581 | const struct kernel_symbol *ksym; |
1da177e4 LT |
1582 | |
1583 | for (i = 1; i < n; i++) { | |
1584 | switch (sym[i].st_shndx) { | |
1585 | case SHN_COMMON: | |
1586 | /* We compiled with -fno-common. These are not | |
1587 | supposed to happen. */ | |
1588 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1589 | printk("%s: please compile with -fno-common\n", | |
1590 | mod->name); | |
1591 | ret = -ENOEXEC; | |
1592 | break; | |
1593 | ||
1594 | case SHN_ABS: | |
1595 | /* Don't need to do anything */ | |
1596 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1597 | (long)sym[i].st_value); | |
1598 | break; | |
1599 | ||
1600 | case SHN_UNDEF: | |
414fd31b TA |
1601 | ksym = resolve_symbol(sechdrs, versindex, |
1602 | strtab + sym[i].st_name, mod); | |
1da177e4 | 1603 | /* Ok if resolved. */ |
414fd31b TA |
1604 | if (ksym) { |
1605 | sym[i].st_value = ksym->value; | |
1da177e4 | 1606 | break; |
414fd31b TA |
1607 | } |
1608 | ||
1da177e4 LT |
1609 | /* Ok if weak. */ |
1610 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) | |
1611 | break; | |
1612 | ||
1613 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
1614 | mod->name, strtab + sym[i].st_name); | |
1615 | ret = -ENOENT; | |
1616 | break; | |
1617 | ||
1618 | default: | |
1619 | /* Divert to percpu allocation if a percpu var. */ | |
1620 | if (sym[i].st_shndx == pcpuindex) | |
259354de | 1621 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 LT |
1622 | else |
1623 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1624 | sym[i].st_value += secbase; | |
1625 | break; | |
1626 | } | |
1627 | } | |
1628 | ||
1629 | return ret; | |
1630 | } | |
1631 | ||
088af9a6 HD |
1632 | /* Additional bytes needed by arch in front of individual sections */ |
1633 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1634 | unsigned int section) | |
1635 | { | |
1636 | /* default implementation just returns zero */ | |
1637 | return 0; | |
1638 | } | |
1639 | ||
1da177e4 | 1640 | /* Update size with this section: return offset. */ |
088af9a6 HD |
1641 | static long get_offset(struct module *mod, unsigned int *size, |
1642 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
1643 | { |
1644 | long ret; | |
1645 | ||
088af9a6 | 1646 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1647 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1648 | *size = ret + sechdr->sh_size; | |
1649 | return ret; | |
1650 | } | |
1651 | ||
1652 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1653 | might -- code, read-only data, read-write data, small data. Tally | |
1654 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1655 | belongs in init. */ | |
1656 | static void layout_sections(struct module *mod, | |
1657 | const Elf_Ehdr *hdr, | |
1658 | Elf_Shdr *sechdrs, | |
1659 | const char *secstrings) | |
1660 | { | |
1661 | static unsigned long const masks[][2] = { | |
1662 | /* NOTE: all executable code must be the first section | |
1663 | * in this array; otherwise modify the text_size | |
1664 | * finder in the two loops below */ | |
1665 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1666 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1667 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1668 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1669 | }; | |
1670 | unsigned int m, i; | |
1671 | ||
1672 | for (i = 0; i < hdr->e_shnum; i++) | |
1673 | sechdrs[i].sh_entsize = ~0UL; | |
1674 | ||
1675 | DEBUGP("Core section allocation order:\n"); | |
1676 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1677 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1678 | Elf_Shdr *s = &sechdrs[i]; | |
1679 | ||
1680 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1681 | || (s->sh_flags & masks[m][1]) | |
1682 | || s->sh_entsize != ~0UL | |
49502677 | 1683 | || strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1684 | continue; |
088af9a6 | 1685 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
1da177e4 LT |
1686 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
1687 | } | |
1688 | if (m == 0) | |
1689 | mod->core_text_size = mod->core_size; | |
1690 | } | |
1691 | ||
1692 | DEBUGP("Init section allocation order:\n"); | |
1693 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1694 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1695 | Elf_Shdr *s = &sechdrs[i]; | |
1696 | ||
1697 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1698 | || (s->sh_flags & masks[m][1]) | |
1699 | || s->sh_entsize != ~0UL | |
49502677 | 1700 | || !strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1701 | continue; |
088af9a6 | 1702 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 LT |
1703 | | INIT_OFFSET_MASK); |
1704 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1705 | } | |
1706 | if (m == 0) | |
1707 | mod->init_text_size = mod->init_size; | |
1708 | } | |
1709 | } | |
1710 | ||
1da177e4 LT |
1711 | static void set_license(struct module *mod, const char *license) |
1712 | { | |
1713 | if (!license) | |
1714 | license = "unspecified"; | |
1715 | ||
fa3ba2e8 | 1716 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1717 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 1718 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1719 | "kernel.\n", mod->name, license); |
1720 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1721 | } |
1722 | } | |
1723 | ||
1724 | /* Parse tag=value strings from .modinfo section */ | |
1725 | static char *next_string(char *string, unsigned long *secsize) | |
1726 | { | |
1727 | /* Skip non-zero chars */ | |
1728 | while (string[0]) { | |
1729 | string++; | |
1730 | if ((*secsize)-- <= 1) | |
1731 | return NULL; | |
1732 | } | |
1733 | ||
1734 | /* Skip any zero padding. */ | |
1735 | while (!string[0]) { | |
1736 | string++; | |
1737 | if ((*secsize)-- <= 1) | |
1738 | return NULL; | |
1739 | } | |
1740 | return string; | |
1741 | } | |
1742 | ||
1743 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1744 | unsigned int info, | |
1745 | const char *tag) | |
1746 | { | |
1747 | char *p; | |
1748 | unsigned int taglen = strlen(tag); | |
1749 | unsigned long size = sechdrs[info].sh_size; | |
1750 | ||
1751 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1752 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1753 | return p + taglen + 1; | |
1754 | } | |
1755 | return NULL; | |
1756 | } | |
1757 | ||
c988d2b2 MD |
1758 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1759 | unsigned int infoindex) | |
1760 | { | |
1761 | struct module_attribute *attr; | |
1762 | int i; | |
1763 | ||
1764 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1765 | if (attr->setup) | |
1766 | attr->setup(mod, | |
1767 | get_modinfo(sechdrs, | |
1768 | infoindex, | |
1769 | attr->attr.name)); | |
1770 | } | |
1771 | } | |
c988d2b2 | 1772 | |
a263f776 RR |
1773 | static void free_modinfo(struct module *mod) |
1774 | { | |
1775 | struct module_attribute *attr; | |
1776 | int i; | |
1777 | ||
1778 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1779 | if (attr->free) | |
1780 | attr->free(mod); | |
1781 | } | |
1782 | } | |
1783 | ||
1da177e4 | 1784 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
1785 | |
1786 | /* lookup symbol in given range of kernel_symbols */ | |
1787 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
1788 | const struct kernel_symbol *start, | |
1789 | const struct kernel_symbol *stop) | |
1790 | { | |
1791 | const struct kernel_symbol *ks = start; | |
1792 | for (; ks < stop; ks++) | |
1793 | if (strcmp(ks->name, name) == 0) | |
1794 | return ks; | |
1795 | return NULL; | |
1796 | } | |
1797 | ||
ca4787b7 TA |
1798 | static int is_exported(const char *name, unsigned long value, |
1799 | const struct module *mod) | |
1da177e4 | 1800 | { |
ca4787b7 TA |
1801 | const struct kernel_symbol *ks; |
1802 | if (!mod) | |
1803 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 1804 | else |
ca4787b7 TA |
1805 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
1806 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
1807 | } |
1808 | ||
1809 | /* As per nm */ | |
1810 | static char elf_type(const Elf_Sym *sym, | |
1811 | Elf_Shdr *sechdrs, | |
1812 | const char *secstrings, | |
1813 | struct module *mod) | |
1814 | { | |
1815 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1816 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1817 | return 'v'; | |
1818 | else | |
1819 | return 'w'; | |
1820 | } | |
1821 | if (sym->st_shndx == SHN_UNDEF) | |
1822 | return 'U'; | |
1823 | if (sym->st_shndx == SHN_ABS) | |
1824 | return 'a'; | |
1825 | if (sym->st_shndx >= SHN_LORESERVE) | |
1826 | return '?'; | |
1827 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1828 | return 't'; | |
1829 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1830 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1831 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1832 | return 'r'; | |
1833 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1834 | return 'g'; | |
1835 | else | |
1836 | return 'd'; | |
1837 | } | |
1838 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1839 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1840 | return 's'; | |
1841 | else | |
1842 | return 'b'; | |
1843 | } | |
49502677 | 1844 | if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug")) |
1da177e4 LT |
1845 | return 'n'; |
1846 | return '?'; | |
1847 | } | |
1848 | ||
4a496226 JB |
1849 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
1850 | unsigned int shnum) | |
1851 | { | |
1852 | const Elf_Shdr *sec; | |
1853 | ||
1854 | if (src->st_shndx == SHN_UNDEF | |
1855 | || src->st_shndx >= shnum | |
1856 | || !src->st_name) | |
1857 | return false; | |
1858 | ||
1859 | sec = sechdrs + src->st_shndx; | |
1860 | if (!(sec->sh_flags & SHF_ALLOC) | |
1861 | #ifndef CONFIG_KALLSYMS_ALL | |
1862 | || !(sec->sh_flags & SHF_EXECINSTR) | |
1863 | #endif | |
1864 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
1865 | return false; | |
1866 | ||
1867 | return true; | |
1868 | } | |
1869 | ||
1870 | static unsigned long layout_symtab(struct module *mod, | |
1871 | Elf_Shdr *sechdrs, | |
1872 | unsigned int symindex, | |
554bdfe5 | 1873 | unsigned int strindex, |
4a496226 | 1874 | const Elf_Ehdr *hdr, |
554bdfe5 JB |
1875 | const char *secstrings, |
1876 | unsigned long *pstroffs, | |
1877 | unsigned long *strmap) | |
4a496226 JB |
1878 | { |
1879 | unsigned long symoffs; | |
1880 | Elf_Shdr *symsect = sechdrs + symindex; | |
554bdfe5 | 1881 | Elf_Shdr *strsect = sechdrs + strindex; |
4a496226 | 1882 | const Elf_Sym *src; |
554bdfe5 | 1883 | const char *strtab; |
4a496226 JB |
1884 | unsigned int i, nsrc, ndst; |
1885 | ||
1886 | /* Put symbol section at end of init part of module. */ | |
1887 | symsect->sh_flags |= SHF_ALLOC; | |
1888 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
1889 | symindex) | INIT_OFFSET_MASK; | |
1890 | DEBUGP("\t%s\n", secstrings + symsect->sh_name); | |
1891 | ||
1892 | src = (void *)hdr + symsect->sh_offset; | |
1893 | nsrc = symsect->sh_size / sizeof(*src); | |
554bdfe5 | 1894 | strtab = (void *)hdr + strsect->sh_offset; |
4a496226 | 1895 | for (ndst = i = 1; i < nsrc; ++i, ++src) |
554bdfe5 JB |
1896 | if (is_core_symbol(src, sechdrs, hdr->e_shnum)) { |
1897 | unsigned int j = src->st_name; | |
1898 | ||
1899 | while(!__test_and_set_bit(j, strmap) && strtab[j]) | |
1900 | ++j; | |
4a496226 | 1901 | ++ndst; |
554bdfe5 | 1902 | } |
4a496226 JB |
1903 | |
1904 | /* Append room for core symbols at end of core part. */ | |
1905 | symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); | |
1906 | mod->core_size = symoffs + ndst * sizeof(Elf_Sym); | |
1907 | ||
554bdfe5 JB |
1908 | /* Put string table section at end of init part of module. */ |
1909 | strsect->sh_flags |= SHF_ALLOC; | |
1910 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
1911 | strindex) | INIT_OFFSET_MASK; | |
1912 | DEBUGP("\t%s\n", secstrings + strsect->sh_name); | |
1913 | ||
1914 | /* Append room for core symbols' strings at end of core part. */ | |
1915 | *pstroffs = mod->core_size; | |
1916 | __set_bit(0, strmap); | |
1917 | mod->core_size += bitmap_weight(strmap, strsect->sh_size); | |
1918 | ||
4a496226 JB |
1919 | return symoffs; |
1920 | } | |
1921 | ||
1da177e4 LT |
1922 | static void add_kallsyms(struct module *mod, |
1923 | Elf_Shdr *sechdrs, | |
4a496226 | 1924 | unsigned int shnum, |
1da177e4 LT |
1925 | unsigned int symindex, |
1926 | unsigned int strindex, | |
4a496226 | 1927 | unsigned long symoffs, |
554bdfe5 JB |
1928 | unsigned long stroffs, |
1929 | const char *secstrings, | |
1930 | unsigned long *strmap) | |
1da177e4 | 1931 | { |
4a496226 JB |
1932 | unsigned int i, ndst; |
1933 | const Elf_Sym *src; | |
1934 | Elf_Sym *dst; | |
554bdfe5 | 1935 | char *s; |
1da177e4 LT |
1936 | |
1937 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
1938 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1939 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
1940 | ||
1941 | /* Set types up while we still have access to sections. */ | |
1942 | for (i = 0; i < mod->num_symtab; i++) | |
1943 | mod->symtab[i].st_info | |
1944 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
4a496226 JB |
1945 | |
1946 | mod->core_symtab = dst = mod->module_core + symoffs; | |
1947 | src = mod->symtab; | |
1948 | *dst = *src; | |
1949 | for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { | |
1950 | if (!is_core_symbol(src, sechdrs, shnum)) | |
1951 | continue; | |
1952 | dst[ndst] = *src; | |
554bdfe5 | 1953 | dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name); |
4a496226 JB |
1954 | ++ndst; |
1955 | } | |
1956 | mod->core_num_syms = ndst; | |
554bdfe5 JB |
1957 | |
1958 | mod->core_strtab = s = mod->module_core + stroffs; | |
1959 | for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i) | |
1960 | if (test_bit(i, strmap)) | |
1961 | *++s = mod->strtab[i]; | |
1da177e4 LT |
1962 | } |
1963 | #else | |
4a496226 JB |
1964 | static inline unsigned long layout_symtab(struct module *mod, |
1965 | Elf_Shdr *sechdrs, | |
1966 | unsigned int symindex, | |
554bdfe5 | 1967 | unsigned int strindex, |
3ae91c21 | 1968 | const Elf_Ehdr *hdr, |
554bdfe5 JB |
1969 | const char *secstrings, |
1970 | unsigned long *pstroffs, | |
1971 | unsigned long *strmap) | |
4a496226 | 1972 | { |
3ae91c21 | 1973 | return 0; |
4a496226 | 1974 | } |
3ae91c21 | 1975 | |
1da177e4 LT |
1976 | static inline void add_kallsyms(struct module *mod, |
1977 | Elf_Shdr *sechdrs, | |
4a496226 | 1978 | unsigned int shnum, |
1da177e4 LT |
1979 | unsigned int symindex, |
1980 | unsigned int strindex, | |
4a496226 | 1981 | unsigned long symoffs, |
554bdfe5 JB |
1982 | unsigned long stroffs, |
1983 | const char *secstrings, | |
1984 | const unsigned long *strmap) | |
1da177e4 LT |
1985 | { |
1986 | } | |
1987 | #endif /* CONFIG_KALLSYMS */ | |
1988 | ||
e9d376f0 | 1989 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 1990 | { |
e9d376f0 JB |
1991 | #ifdef CONFIG_DYNAMIC_DEBUG |
1992 | if (ddebug_add_module(debug, num, debug->modname)) | |
1993 | printk(KERN_ERR "dynamic debug error adding module: %s\n", | |
1994 | debug->modname); | |
1995 | #endif | |
5e458cc0 | 1996 | } |
346e15be | 1997 | |
3a642e99 RR |
1998 | static void *module_alloc_update_bounds(unsigned long size) |
1999 | { | |
2000 | void *ret = module_alloc(size); | |
2001 | ||
2002 | if (ret) { | |
2003 | /* Update module bounds. */ | |
2004 | if ((unsigned long)ret < module_addr_min) | |
2005 | module_addr_min = (unsigned long)ret; | |
2006 | if ((unsigned long)ret + size > module_addr_max) | |
2007 | module_addr_max = (unsigned long)ret + size; | |
2008 | } | |
2009 | return ret; | |
2010 | } | |
2011 | ||
4f2294b6 CM |
2012 | #ifdef CONFIG_DEBUG_KMEMLEAK |
2013 | static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
2014 | Elf_Shdr *sechdrs, char *secstrings) | |
2015 | { | |
2016 | unsigned int i; | |
2017 | ||
2018 | /* only scan the sections containing data */ | |
c017b4be | 2019 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 CM |
2020 | |
2021 | for (i = 1; i < hdr->e_shnum; i++) { | |
2022 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2023 | continue; | |
2024 | if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0 | |
2025 | && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0) | |
2026 | continue; | |
2027 | ||
c017b4be | 2028 | kmemleak_scan_area((void *)sechdrs[i].sh_addr, |
4f2294b6 CM |
2029 | sechdrs[i].sh_size, GFP_KERNEL); |
2030 | } | |
2031 | } | |
2032 | #else | |
2033 | static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
2034 | Elf_Shdr *sechdrs, char *secstrings) | |
2035 | { | |
2036 | } | |
2037 | #endif | |
2038 | ||
1da177e4 LT |
2039 | /* Allocate and load the module: note that size of section 0 is always |
2040 | zero, and we rely on this for optional sections. */ | |
ffb4ba76 | 2041 | static noinline struct module *load_module(void __user *umod, |
1da177e4 LT |
2042 | unsigned long len, |
2043 | const char __user *uargs) | |
2044 | { | |
2045 | Elf_Ehdr *hdr; | |
2046 | Elf_Shdr *sechdrs; | |
2047 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
061b1bd3 | 2048 | char *staging; |
84860f99 AM |
2049 | unsigned int i; |
2050 | unsigned int symindex = 0; | |
2051 | unsigned int strindex = 0; | |
5e458cc0 | 2052 | unsigned int modindex, versindex, infoindex, pcpuindex; |
1da177e4 LT |
2053 | struct module *mod; |
2054 | long err = 0; | |
259354de | 2055 | void *ptr = NULL; /* Stops spurious gcc warning */ |
554bdfe5 | 2056 | unsigned long symoffs, stroffs, *strmap; |
293a7cfe | 2057 | void __percpu *percpu; |
3ae91c21 | 2058 | |
378bac82 | 2059 | mm_segment_t old_fs; |
1da177e4 LT |
2060 | |
2061 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
2062 | umod, len, uargs); | |
2063 | if (len < sizeof(*hdr)) | |
2064 | return ERR_PTR(-ENOEXEC); | |
2065 | ||
2066 | /* Suck in entire file: we'll want most of it. */ | |
2067 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
2068 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
2069 | return ERR_PTR(-ENOMEM); | |
9e01892c | 2070 | |
1da177e4 LT |
2071 | if (copy_from_user(hdr, umod, len) != 0) { |
2072 | err = -EFAULT; | |
2073 | goto free_hdr; | |
2074 | } | |
2075 | ||
2076 | /* Sanity checks against insmoding binaries or wrong arch, | |
2077 | weird elf version */ | |
c4ea6fcf | 2078 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
1da177e4 LT |
2079 | || hdr->e_type != ET_REL |
2080 | || !elf_check_arch(hdr) | |
2081 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
2082 | err = -ENOEXEC; | |
2083 | goto free_hdr; | |
2084 | } | |
2085 | ||
2086 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
2087 | goto truncated; | |
2088 | ||
2089 | /* Convenience variables */ | |
2090 | sechdrs = (void *)hdr + hdr->e_shoff; | |
2091 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
2092 | sechdrs[0].sh_addr = 0; | |
2093 | ||
2094 | for (i = 1; i < hdr->e_shnum; i++) { | |
2095 | if (sechdrs[i].sh_type != SHT_NOBITS | |
2096 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
2097 | goto truncated; | |
2098 | ||
2099 | /* Mark all sections sh_addr with their address in the | |
2100 | temporary image. */ | |
2101 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
2102 | ||
2103 | /* Internal symbols and strings. */ | |
2104 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
2105 | symindex = i; | |
2106 | strindex = sechdrs[i].sh_link; | |
2107 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
2108 | } | |
2109 | #ifndef CONFIG_MODULE_UNLOAD | |
2110 | /* Don't load .exit sections */ | |
49502677 | 2111 | if (strstarts(secstrings+sechdrs[i].sh_name, ".exit")) |
1da177e4 LT |
2112 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2113 | #endif | |
2114 | } | |
2115 | ||
2116 | modindex = find_sec(hdr, sechdrs, secstrings, | |
2117 | ".gnu.linkonce.this_module"); | |
2118 | if (!modindex) { | |
2119 | printk(KERN_WARNING "No module found in object\n"); | |
2120 | err = -ENOEXEC; | |
2121 | goto free_hdr; | |
2122 | } | |
5e458cc0 | 2123 | /* This is temporary: point mod into copy of data. */ |
1da177e4 LT |
2124 | mod = (void *)sechdrs[modindex].sh_addr; |
2125 | ||
2126 | if (symindex == 0) { | |
2127 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
2128 | mod->name); | |
2129 | err = -ENOEXEC; | |
2130 | goto free_hdr; | |
2131 | } | |
2132 | ||
1da177e4 LT |
2133 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); |
2134 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
2135 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
2136 | ||
ea01e798 | 2137 | /* Don't keep modinfo and version sections. */ |
1da177e4 | 2138 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
ea01e798 | 2139 | sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
2140 | |
2141 | /* Check module struct version now, before we try to use module. */ | |
2142 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
2143 | err = -ENOEXEC; | |
2144 | goto free_hdr; | |
2145 | } | |
2146 | ||
2147 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
2148 | /* This is allowed: modprobe --force will invalidate it. */ | |
2149 | if (!modmagic) { | |
c6e665c8 | 2150 | err = try_to_force_load(mod, "bad vermagic"); |
826e4506 LT |
2151 | if (err) |
2152 | goto free_hdr; | |
91e37a79 | 2153 | } else if (!same_magic(modmagic, vermagic, versindex)) { |
1da177e4 LT |
2154 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
2155 | mod->name, modmagic, vermagic); | |
2156 | err = -ENOEXEC; | |
2157 | goto free_hdr; | |
2158 | } | |
2159 | ||
061b1bd3 GKH |
2160 | staging = get_modinfo(sechdrs, infoindex, "staging"); |
2161 | if (staging) { | |
2162 | add_taint_module(mod, TAINT_CRAP); | |
2163 | printk(KERN_WARNING "%s: module is from the staging directory," | |
2164 | " the quality is unknown, you have been warned.\n", | |
2165 | mod->name); | |
2166 | } | |
2167 | ||
1da177e4 | 2168 | /* Now copy in args */ |
24277dda DA |
2169 | args = strndup_user(uargs, ~0UL >> 1); |
2170 | if (IS_ERR(args)) { | |
2171 | err = PTR_ERR(args); | |
1da177e4 LT |
2172 | goto free_hdr; |
2173 | } | |
8e08b756 | 2174 | |
554bdfe5 JB |
2175 | strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size) |
2176 | * sizeof(long), GFP_KERNEL); | |
2177 | if (!strmap) { | |
2178 | err = -ENOMEM; | |
2179 | goto free_mod; | |
2180 | } | |
2181 | ||
1da177e4 LT |
2182 | if (find_module(mod->name)) { |
2183 | err = -EEXIST; | |
2184 | goto free_mod; | |
2185 | } | |
2186 | ||
2187 | mod->state = MODULE_STATE_COMING; | |
2188 | ||
2189 | /* Allow arches to frob section contents and sizes. */ | |
2190 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
2191 | if (err < 0) | |
2192 | goto free_mod; | |
2193 | ||
2194 | if (pcpuindex) { | |
2195 | /* We have a special allocation for this section. */ | |
259354de TH |
2196 | err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size, |
2197 | sechdrs[pcpuindex].sh_addralign); | |
2198 | if (err) | |
6e2b7574 | 2199 | goto free_mod; |
1da177e4 | 2200 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 | 2201 | } |
293a7cfe RR |
2202 | /* Keep this around for failure path. */ |
2203 | percpu = mod_percpu(mod); | |
1da177e4 LT |
2204 | |
2205 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2206 | this is done generically; there doesn't appear to be any | |
2207 | special cases for the architectures. */ | |
2208 | layout_sections(mod, hdr, sechdrs, secstrings); | |
554bdfe5 JB |
2209 | symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr, |
2210 | secstrings, &stroffs, strmap); | |
1da177e4 LT |
2211 | |
2212 | /* Do the allocs. */ | |
3a642e99 | 2213 | ptr = module_alloc_update_bounds(mod->core_size); |
4f2294b6 CM |
2214 | /* |
2215 | * The pointer to this block is stored in the module structure | |
2216 | * which is inside the block. Just mark it as not being a | |
2217 | * leak. | |
2218 | */ | |
2219 | kmemleak_not_leak(ptr); | |
1da177e4 LT |
2220 | if (!ptr) { |
2221 | err = -ENOMEM; | |
2222 | goto free_percpu; | |
2223 | } | |
2224 | memset(ptr, 0, mod->core_size); | |
2225 | mod->module_core = ptr; | |
2226 | ||
3a642e99 | 2227 | ptr = module_alloc_update_bounds(mod->init_size); |
4f2294b6 CM |
2228 | /* |
2229 | * The pointer to this block is stored in the module structure | |
2230 | * which is inside the block. This block doesn't need to be | |
2231 | * scanned as it contains data and code that will be freed | |
2232 | * after the module is initialized. | |
2233 | */ | |
2234 | kmemleak_ignore(ptr); | |
1da177e4 LT |
2235 | if (!ptr && mod->init_size) { |
2236 | err = -ENOMEM; | |
2237 | goto free_core; | |
2238 | } | |
2239 | memset(ptr, 0, mod->init_size); | |
2240 | mod->module_init = ptr; | |
2241 | ||
2242 | /* Transfer each section which specifies SHF_ALLOC */ | |
2243 | DEBUGP("final section addresses:\n"); | |
2244 | for (i = 0; i < hdr->e_shnum; i++) { | |
2245 | void *dest; | |
2246 | ||
2247 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2248 | continue; | |
2249 | ||
2250 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
2251 | dest = mod->module_init | |
2252 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
2253 | else | |
2254 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
2255 | ||
2256 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
2257 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
2258 | sechdrs[i].sh_size); | |
2259 | /* Update sh_addr to point to copy in image. */ | |
2260 | sechdrs[i].sh_addr = (unsigned long)dest; | |
2261 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
2262 | } | |
2263 | /* Module has been moved. */ | |
2264 | mod = (void *)sechdrs[modindex].sh_addr; | |
4f2294b6 | 2265 | kmemleak_load_module(mod, hdr, sechdrs, secstrings); |
1da177e4 | 2266 | |
e1783a24 CL |
2267 | #if defined(CONFIG_MODULE_UNLOAD) |
2268 | mod->refptr = alloc_percpu(struct module_ref); | |
6e2b7574 MH |
2269 | if (!mod->refptr) { |
2270 | err = -ENOMEM; | |
2271 | goto free_init; | |
2272 | } | |
2273 | #endif | |
1da177e4 LT |
2274 | /* Now we've moved module, initialize linked lists, etc. */ |
2275 | module_unload_init(mod); | |
2276 | ||
2277 | /* Set up license info based on the info section */ | |
2278 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
2279 | ||
9b37ccfc PR |
2280 | /* |
2281 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2282 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2283 | * using GPL-only symbols it needs. | |
2284 | */ | |
fa3ba2e8 | 2285 | if (strcmp(mod->name, "ndiswrapper") == 0) |
9b37ccfc PR |
2286 | add_taint(TAINT_PROPRIETARY_MODULE); |
2287 | ||
2288 | /* driverloader was caught wrongly pretending to be under GPL */ | |
fa3ba2e8 FM |
2289 | if (strcmp(mod->name, "driverloader") == 0) |
2290 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
9841d61d | 2291 | |
c988d2b2 MD |
2292 | /* Set up MODINFO_ATTR fields */ |
2293 | setup_modinfo(mod, sechdrs, infoindex); | |
c988d2b2 | 2294 | |
1da177e4 LT |
2295 | /* Fix up syms, so that st_value is a pointer to location. */ |
2296 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
2297 | mod); | |
2298 | if (err < 0) | |
2299 | goto cleanup; | |
2300 | ||
5e458cc0 RR |
2301 | /* Now we've got everything in the final locations, we can |
2302 | * find optional sections. */ | |
e180a6b7 RR |
2303 | mod->kp = section_objs(hdr, sechdrs, secstrings, "__param", |
2304 | sizeof(*mod->kp), &mod->num_kp); | |
5e458cc0 RR |
2305 | mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab", |
2306 | sizeof(*mod->syms), &mod->num_syms); | |
2307 | mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab"); | |
2308 | mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl", | |
2309 | sizeof(*mod->gpl_syms), | |
2310 | &mod->num_gpl_syms); | |
2311 | mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
2312 | mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings, | |
2313 | "__ksymtab_gpl_future", | |
2314 | sizeof(*mod->gpl_future_syms), | |
2315 | &mod->num_gpl_future_syms); | |
2316 | mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings, | |
2317 | "__kcrctab_gpl_future"); | |
1da177e4 | 2318 | |
f7f5b675 | 2319 | #ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0 RR |
2320 | mod->unused_syms = section_objs(hdr, sechdrs, secstrings, |
2321 | "__ksymtab_unused", | |
2322 | sizeof(*mod->unused_syms), | |
2323 | &mod->num_unused_syms); | |
2324 | mod->unused_crcs = section_addr(hdr, sechdrs, secstrings, | |
2325 | "__kcrctab_unused"); | |
2326 | mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings, | |
2327 | "__ksymtab_unused_gpl", | |
2328 | sizeof(*mod->unused_gpl_syms), | |
2329 | &mod->num_unused_gpl_syms); | |
2330 | mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings, | |
2331 | "__kcrctab_unused_gpl"); | |
2332 | #endif | |
b99b87f7 PO |
2333 | #ifdef CONFIG_CONSTRUCTORS |
2334 | mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors", | |
2335 | sizeof(*mod->ctors), &mod->num_ctors); | |
2336 | #endif | |
5e458cc0 | 2337 | |
5e458cc0 RR |
2338 | #ifdef CONFIG_TRACEPOINTS |
2339 | mod->tracepoints = section_objs(hdr, sechdrs, secstrings, | |
2340 | "__tracepoints", | |
2341 | sizeof(*mod->tracepoints), | |
2342 | &mod->num_tracepoints); | |
f7f5b675 | 2343 | #endif |
6d723736 SR |
2344 | #ifdef CONFIG_EVENT_TRACING |
2345 | mod->trace_events = section_objs(hdr, sechdrs, secstrings, | |
2346 | "_ftrace_events", | |
2347 | sizeof(*mod->trace_events), | |
2348 | &mod->num_trace_events); | |
a6f5aa1e CM |
2349 | /* |
2350 | * This section contains pointers to allocated objects in the trace | |
2351 | * code and not scanning it leads to false positives. | |
2352 | */ | |
2353 | kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) * | |
2354 | mod->num_trace_events, GFP_KERNEL); | |
6d723736 | 2355 | #endif |
93eb677d SR |
2356 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2357 | /* sechdrs[0].sh_size is always zero */ | |
2358 | mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings, | |
2359 | "__mcount_loc", | |
2360 | sizeof(*mod->ftrace_callsites), | |
2361 | &mod->num_ftrace_callsites); | |
2362 | #endif | |
1da177e4 | 2363 | #ifdef CONFIG_MODVERSIONS |
5e458cc0 RR |
2364 | if ((mod->num_syms && !mod->crcs) |
2365 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2366 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
f7f5b675 | 2367 | #ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0 RR |
2368 | || (mod->num_unused_syms && !mod->unused_crcs) |
2369 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
f7f5b675 DV |
2370 | #endif |
2371 | ) { | |
c6e665c8 RR |
2372 | err = try_to_force_load(mod, |
2373 | "no versions for exported symbols"); | |
826e4506 LT |
2374 | if (err) |
2375 | goto cleanup; | |
1da177e4 LT |
2376 | } |
2377 | #endif | |
2378 | ||
2379 | /* Now do relocations. */ | |
2380 | for (i = 1; i < hdr->e_shnum; i++) { | |
2381 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
2382 | unsigned int info = sechdrs[i].sh_info; | |
2383 | ||
2384 | /* Not a valid relocation section? */ | |
2385 | if (info >= hdr->e_shnum) | |
2386 | continue; | |
2387 | ||
2388 | /* Don't bother with non-allocated sections */ | |
2389 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
2390 | continue; | |
2391 | ||
2392 | if (sechdrs[i].sh_type == SHT_REL) | |
2393 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
2394 | else if (sechdrs[i].sh_type == SHT_RELA) | |
2395 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
2396 | mod); | |
2397 | if (err < 0) | |
2398 | goto cleanup; | |
2399 | } | |
2400 | ||
eea8b54d AN |
2401 | /* Find duplicate symbols */ |
2402 | err = verify_export_symbols(mod); | |
eea8b54d AN |
2403 | if (err < 0) |
2404 | goto cleanup; | |
2405 | ||
1da177e4 | 2406 | /* Set up and sort exception table */ |
5e458cc0 RR |
2407 | mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table", |
2408 | sizeof(*mod->extable), &mod->num_exentries); | |
2409 | sort_extable(mod->extable, mod->extable + mod->num_exentries); | |
1da177e4 LT |
2410 | |
2411 | /* Finally, copy percpu area over. */ | |
259354de | 2412 | percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr, |
1da177e4 LT |
2413 | sechdrs[pcpuindex].sh_size); |
2414 | ||
4a496226 | 2415 | add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex, |
554bdfe5 JB |
2416 | symoffs, stroffs, secstrings, strmap); |
2417 | kfree(strmap); | |
2418 | strmap = NULL; | |
1da177e4 | 2419 | |
97e1c18e | 2420 | if (!mod->taints) { |
e9d376f0 | 2421 | struct _ddebug *debug; |
5e458cc0 RR |
2422 | unsigned int num_debug; |
2423 | ||
5e458cc0 RR |
2424 | debug = section_objs(hdr, sechdrs, secstrings, "__verbose", |
2425 | sizeof(*debug), &num_debug); | |
e9d376f0 JB |
2426 | if (debug) |
2427 | dynamic_debug_setup(debug, num_debug); | |
97e1c18e | 2428 | } |
90d595fe | 2429 | |
1da177e4 LT |
2430 | err = module_finalize(hdr, sechdrs, mod); |
2431 | if (err < 0) | |
2432 | goto cleanup; | |
2433 | ||
378bac82 TK |
2434 | /* flush the icache in correct context */ |
2435 | old_fs = get_fs(); | |
2436 | set_fs(KERNEL_DS); | |
2437 | ||
2438 | /* | |
2439 | * Flush the instruction cache, since we've played with text. | |
2440 | * Do it before processing of module parameters, so the module | |
2441 | * can provide parameter accessor functions of its own. | |
2442 | */ | |
2443 | if (mod->module_init) | |
2444 | flush_icache_range((unsigned long)mod->module_init, | |
2445 | (unsigned long)mod->module_init | |
2446 | + mod->init_size); | |
2447 | flush_icache_range((unsigned long)mod->module_core, | |
2448 | (unsigned long)mod->module_core + mod->core_size); | |
2449 | ||
2450 | set_fs(old_fs); | |
2451 | ||
1da177e4 | 2452 | mod->args = args; |
5e458cc0 | 2453 | if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) |
8d3b33f6 RR |
2454 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2455 | mod->name); | |
2456 | ||
bb9d3d56 | 2457 | /* Now sew it into the lists so we can get lockdep and oops |
d72b3751 AK |
2458 | * info during argument parsing. Noone should access us, since |
2459 | * strong_try_module_get() will fail. | |
2460 | * lockdep/oops can run asynchronous, so use the RCU list insertion | |
2461 | * function to insert in a way safe to concurrent readers. | |
2462 | * The mutex protects against concurrent writers. | |
2463 | */ | |
2464 | list_add_rcu(&mod->list, &modules); | |
bb9d3d56 | 2465 | |
e180a6b7 | 2466 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
1da177e4 | 2467 | if (err < 0) |
bb9d3d56 | 2468 | goto unlink; |
1da177e4 | 2469 | |
e180a6b7 | 2470 | err = mod_sysfs_setup(mod, mod->kp, mod->num_kp); |
1da177e4 | 2471 | if (err < 0) |
bb9d3d56 | 2472 | goto unlink; |
80a3d1bb | 2473 | |
1da177e4 | 2474 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
6d760133 | 2475 | add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
1da177e4 LT |
2476 | |
2477 | /* Get rid of temporary copy */ | |
2478 | vfree(hdr); | |
2479 | ||
7ead8b83 LZ |
2480 | trace_module_load(mod); |
2481 | ||
1da177e4 LT |
2482 | /* Done! */ |
2483 | return mod; | |
2484 | ||
bb9d3d56 | 2485 | unlink: |
e91defa2 RR |
2486 | /* Unlink carefully: kallsyms could be walking list. */ |
2487 | list_del_rcu(&mod->list); | |
2488 | synchronize_sched(); | |
1da177e4 LT |
2489 | module_arch_cleanup(mod); |
2490 | cleanup: | |
a263f776 | 2491 | free_modinfo(mod); |
1da177e4 | 2492 | module_unload_free(mod); |
e1783a24 CL |
2493 | #if defined(CONFIG_MODULE_UNLOAD) |
2494 | free_percpu(mod->refptr); | |
ffa9f12a | 2495 | free_init: |
6e2b7574 | 2496 | #endif |
1da177e4 LT |
2497 | module_free(mod, mod->module_init); |
2498 | free_core: | |
2499 | module_free(mod, mod->module_core); | |
6e2b7574 | 2500 | /* mod will be freed with core. Don't access it beyond this line! */ |
1da177e4 | 2501 | free_percpu: |
293a7cfe | 2502 | free_percpu(percpu); |
1da177e4 LT |
2503 | free_mod: |
2504 | kfree(args); | |
554bdfe5 | 2505 | kfree(strmap); |
1da177e4 LT |
2506 | free_hdr: |
2507 | vfree(hdr); | |
6fe2e70b | 2508 | return ERR_PTR(err); |
1da177e4 LT |
2509 | |
2510 | truncated: | |
2511 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
2512 | err = -ENOEXEC; | |
2513 | goto free_hdr; | |
2514 | } | |
2515 | ||
b99b87f7 PO |
2516 | /* Call module constructors. */ |
2517 | static void do_mod_ctors(struct module *mod) | |
2518 | { | |
2519 | #ifdef CONFIG_CONSTRUCTORS | |
2520 | unsigned long i; | |
2521 | ||
2522 | for (i = 0; i < mod->num_ctors; i++) | |
2523 | mod->ctors[i](); | |
2524 | #endif | |
2525 | } | |
2526 | ||
1da177e4 | 2527 | /* This is where the real work happens */ |
17da2bd9 HC |
2528 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2529 | unsigned long, len, const char __user *, uargs) | |
1da177e4 LT |
2530 | { |
2531 | struct module *mod; | |
2532 | int ret = 0; | |
2533 | ||
2534 | /* Must have permission */ | |
3d43321b | 2535 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
1da177e4 LT |
2536 | return -EPERM; |
2537 | ||
2538 | /* Only one module load at a time, please */ | |
6389a385 | 2539 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
2540 | return -EINTR; |
2541 | ||
2542 | /* Do all the hard work */ | |
2543 | mod = load_module(umod, len, uargs); | |
2544 | if (IS_ERR(mod)) { | |
6389a385 | 2545 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2546 | return PTR_ERR(mod); |
2547 | } | |
2548 | ||
1da177e4 | 2549 | /* Drop lock so they can recurse */ |
6389a385 | 2550 | mutex_unlock(&module_mutex); |
1da177e4 | 2551 | |
e041c683 AS |
2552 | blocking_notifier_call_chain(&module_notify_list, |
2553 | MODULE_STATE_COMING, mod); | |
1da177e4 | 2554 | |
b99b87f7 | 2555 | do_mod_ctors(mod); |
1da177e4 LT |
2556 | /* Start the module */ |
2557 | if (mod->init != NULL) | |
59f9415f | 2558 | ret = do_one_initcall(mod->init); |
1da177e4 LT |
2559 | if (ret < 0) { |
2560 | /* Init routine failed: abort. Try to protect us from | |
2561 | buggy refcounters. */ | |
2562 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2563 | synchronize_sched(); |
af49d924 | 2564 | module_put(mod); |
df4b565e PO |
2565 | blocking_notifier_call_chain(&module_notify_list, |
2566 | MODULE_STATE_GOING, mod); | |
af49d924 RR |
2567 | mutex_lock(&module_mutex); |
2568 | free_module(mod); | |
2569 | mutex_unlock(&module_mutex); | |
c9a3ba55 | 2570 | wake_up(&module_wq); |
1da177e4 LT |
2571 | return ret; |
2572 | } | |
e24e2e64 | 2573 | if (ret > 0) { |
ad361c98 JP |
2574 | printk(KERN_WARNING |
2575 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" | |
2576 | "%s: loading module anyway...\n", | |
e24e2e64 AD |
2577 | __func__, mod->name, ret, |
2578 | __func__); | |
2579 | dump_stack(); | |
2580 | } | |
1da177e4 | 2581 | |
6c5db22d | 2582 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 2583 | mod->state = MODULE_STATE_LIVE; |
6c5db22d | 2584 | wake_up(&module_wq); |
0deddf43 MH |
2585 | blocking_notifier_call_chain(&module_notify_list, |
2586 | MODULE_STATE_LIVE, mod); | |
6c5db22d | 2587 | |
d6de2c80 LT |
2588 | /* We need to finish all async code before the module init sequence is done */ |
2589 | async_synchronize_full(); | |
2590 | ||
6c5db22d | 2591 | mutex_lock(&module_mutex); |
1da177e4 LT |
2592 | /* Drop initial reference. */ |
2593 | module_put(mod); | |
ad6561df | 2594 | trim_init_extable(mod); |
4a496226 JB |
2595 | #ifdef CONFIG_KALLSYMS |
2596 | mod->num_symtab = mod->core_num_syms; | |
2597 | mod->symtab = mod->core_symtab; | |
554bdfe5 | 2598 | mod->strtab = mod->core_strtab; |
4a496226 | 2599 | #endif |
1da177e4 LT |
2600 | module_free(mod, mod->module_init); |
2601 | mod->module_init = NULL; | |
2602 | mod->init_size = 0; | |
2603 | mod->init_text_size = 0; | |
6389a385 | 2604 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2605 | |
2606 | return 0; | |
2607 | } | |
2608 | ||
2609 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2610 | { | |
2611 | return ((void *)addr >= start && (void *)addr < start + size); | |
2612 | } | |
2613 | ||
2614 | #ifdef CONFIG_KALLSYMS | |
2615 | /* | |
2616 | * This ignores the intensely annoying "mapping symbols" found | |
2617 | * in ARM ELF files: $a, $t and $d. | |
2618 | */ | |
2619 | static inline int is_arm_mapping_symbol(const char *str) | |
2620 | { | |
22a8bdeb | 2621 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2622 | && (str[2] == '\0' || str[2] == '.'); |
2623 | } | |
2624 | ||
2625 | static const char *get_ksymbol(struct module *mod, | |
2626 | unsigned long addr, | |
2627 | unsigned long *size, | |
2628 | unsigned long *offset) | |
2629 | { | |
2630 | unsigned int i, best = 0; | |
2631 | unsigned long nextval; | |
2632 | ||
2633 | /* At worse, next value is at end of module */ | |
a06f6211 | 2634 | if (within_module_init(addr, mod)) |
1da177e4 | 2635 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 2636 | else |
1da177e4 LT |
2637 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2638 | ||
2639 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
22a8bdeb | 2640 | starts real symbols at 1). */ |
1da177e4 LT |
2641 | for (i = 1; i < mod->num_symtab; i++) { |
2642 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2643 | continue; | |
2644 | ||
2645 | /* We ignore unnamed symbols: they're uninformative | |
2646 | * and inserted at a whim. */ | |
2647 | if (mod->symtab[i].st_value <= addr | |
2648 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2649 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2650 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2651 | best = i; | |
2652 | if (mod->symtab[i].st_value > addr | |
2653 | && mod->symtab[i].st_value < nextval | |
2654 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2655 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2656 | nextval = mod->symtab[i].st_value; | |
2657 | } | |
2658 | ||
2659 | if (!best) | |
2660 | return NULL; | |
2661 | ||
ffb45122 AD |
2662 | if (size) |
2663 | *size = nextval - mod->symtab[best].st_value; | |
2664 | if (offset) | |
2665 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2666 | return mod->strtab + mod->symtab[best].st_name; |
2667 | } | |
2668 | ||
6dd06c9f RR |
2669 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2670 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 2671 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
2672 | unsigned long *size, |
2673 | unsigned long *offset, | |
2674 | char **modname, | |
2675 | char *namebuf) | |
1da177e4 LT |
2676 | { |
2677 | struct module *mod; | |
cb2a5205 | 2678 | const char *ret = NULL; |
1da177e4 | 2679 | |
cb2a5205 | 2680 | preempt_disable(); |
d72b3751 | 2681 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2682 | if (within_module_init(addr, mod) || |
2683 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
2684 | if (modname) |
2685 | *modname = mod->name; | |
cb2a5205 RR |
2686 | ret = get_ksymbol(mod, addr, size, offset); |
2687 | break; | |
1da177e4 LT |
2688 | } |
2689 | } | |
6dd06c9f RR |
2690 | /* Make a copy in here where it's safe */ |
2691 | if (ret) { | |
2692 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
2693 | ret = namebuf; | |
2694 | } | |
cb2a5205 | 2695 | preempt_enable(); |
92dfc9dc | 2696 | return ret; |
1da177e4 LT |
2697 | } |
2698 | ||
9d65cb4a AD |
2699 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2700 | { | |
2701 | struct module *mod; | |
2702 | ||
cb2a5205 | 2703 | preempt_disable(); |
d72b3751 | 2704 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2705 | if (within_module_init(addr, mod) || |
2706 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
2707 | const char *sym; |
2708 | ||
2709 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2710 | if (!sym) | |
2711 | goto out; | |
9281acea | 2712 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 2713 | preempt_enable(); |
9d65cb4a AD |
2714 | return 0; |
2715 | } | |
2716 | } | |
2717 | out: | |
cb2a5205 | 2718 | preempt_enable(); |
9d65cb4a AD |
2719 | return -ERANGE; |
2720 | } | |
2721 | ||
a5c43dae AD |
2722 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2723 | unsigned long *offset, char *modname, char *name) | |
2724 | { | |
2725 | struct module *mod; | |
2726 | ||
cb2a5205 | 2727 | preempt_disable(); |
d72b3751 | 2728 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2729 | if (within_module_init(addr, mod) || |
2730 | within_module_core(addr, mod)) { | |
a5c43dae AD |
2731 | const char *sym; |
2732 | ||
2733 | sym = get_ksymbol(mod, addr, size, offset); | |
2734 | if (!sym) | |
2735 | goto out; | |
2736 | if (modname) | |
9281acea | 2737 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 2738 | if (name) |
9281acea | 2739 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 2740 | preempt_enable(); |
a5c43dae AD |
2741 | return 0; |
2742 | } | |
2743 | } | |
2744 | out: | |
cb2a5205 | 2745 | preempt_enable(); |
a5c43dae AD |
2746 | return -ERANGE; |
2747 | } | |
2748 | ||
ea07890a AD |
2749 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2750 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2751 | { |
2752 | struct module *mod; | |
2753 | ||
cb2a5205 | 2754 | preempt_disable(); |
d72b3751 | 2755 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
2756 | if (symnum < mod->num_symtab) { |
2757 | *value = mod->symtab[symnum].st_value; | |
2758 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2759 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
2760 | KSYM_NAME_LEN); |
2761 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 2762 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 2763 | preempt_enable(); |
ea07890a | 2764 | return 0; |
1da177e4 LT |
2765 | } |
2766 | symnum -= mod->num_symtab; | |
2767 | } | |
cb2a5205 | 2768 | preempt_enable(); |
ea07890a | 2769 | return -ERANGE; |
1da177e4 LT |
2770 | } |
2771 | ||
2772 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2773 | { | |
2774 | unsigned int i; | |
2775 | ||
2776 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2777 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2778 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2779 | return mod->symtab[i].st_value; |
2780 | return 0; | |
2781 | } | |
2782 | ||
2783 | /* Look for this name: can be of form module:name. */ | |
2784 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2785 | { | |
2786 | struct module *mod; | |
2787 | char *colon; | |
2788 | unsigned long ret = 0; | |
2789 | ||
2790 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 2791 | preempt_disable(); |
1da177e4 LT |
2792 | if ((colon = strchr(name, ':')) != NULL) { |
2793 | *colon = '\0'; | |
2794 | if ((mod = find_module(name)) != NULL) | |
2795 | ret = mod_find_symname(mod, colon+1); | |
2796 | *colon = ':'; | |
2797 | } else { | |
d72b3751 | 2798 | list_for_each_entry_rcu(mod, &modules, list) |
1da177e4 LT |
2799 | if ((ret = mod_find_symname(mod, name)) != 0) |
2800 | break; | |
2801 | } | |
cb2a5205 | 2802 | preempt_enable(); |
1da177e4 LT |
2803 | return ret; |
2804 | } | |
75a66614 AK |
2805 | |
2806 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
2807 | struct module *, unsigned long), | |
2808 | void *data) | |
2809 | { | |
2810 | struct module *mod; | |
2811 | unsigned int i; | |
2812 | int ret; | |
2813 | ||
2814 | list_for_each_entry(mod, &modules, list) { | |
2815 | for (i = 0; i < mod->num_symtab; i++) { | |
2816 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
2817 | mod, mod->symtab[i].st_value); | |
2818 | if (ret != 0) | |
2819 | return ret; | |
2820 | } | |
2821 | } | |
2822 | return 0; | |
2823 | } | |
1da177e4 LT |
2824 | #endif /* CONFIG_KALLSYMS */ |
2825 | ||
21aa9280 | 2826 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
2827 | { |
2828 | int bx = 0; | |
2829 | ||
21aa9280 AV |
2830 | if (mod->taints || |
2831 | mod->state == MODULE_STATE_GOING || | |
2832 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 2833 | buf[bx++] = '('; |
25ddbb18 | 2834 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e8 | 2835 | buf[bx++] = 'P'; |
25ddbb18 | 2836 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e8 | 2837 | buf[bx++] = 'F'; |
26e9a397 | 2838 | if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd3 | 2839 | buf[bx++] = 'C'; |
fa3ba2e8 FM |
2840 | /* |
2841 | * TAINT_FORCED_RMMOD: could be added. | |
2842 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
2843 | * apply to modules. | |
2844 | */ | |
21aa9280 AV |
2845 | |
2846 | /* Show a - for module-is-being-unloaded */ | |
2847 | if (mod->state == MODULE_STATE_GOING) | |
2848 | buf[bx++] = '-'; | |
2849 | /* Show a + for module-is-being-loaded */ | |
2850 | if (mod->state == MODULE_STATE_COMING) | |
2851 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
2852 | buf[bx++] = ')'; |
2853 | } | |
2854 | buf[bx] = '\0'; | |
2855 | ||
2856 | return buf; | |
2857 | } | |
2858 | ||
3b5d5c6b AD |
2859 | #ifdef CONFIG_PROC_FS |
2860 | /* Called by the /proc file system to return a list of modules. */ | |
2861 | static void *m_start(struct seq_file *m, loff_t *pos) | |
2862 | { | |
2863 | mutex_lock(&module_mutex); | |
2864 | return seq_list_start(&modules, *pos); | |
2865 | } | |
2866 | ||
2867 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
2868 | { | |
2869 | return seq_list_next(p, &modules, pos); | |
2870 | } | |
2871 | ||
2872 | static void m_stop(struct seq_file *m, void *p) | |
2873 | { | |
2874 | mutex_unlock(&module_mutex); | |
2875 | } | |
2876 | ||
1da177e4 LT |
2877 | static int m_show(struct seq_file *m, void *p) |
2878 | { | |
2879 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
2880 | char buf[8]; |
2881 | ||
2f0f2a33 | 2882 | seq_printf(m, "%s %u", |
1da177e4 LT |
2883 | mod->name, mod->init_size + mod->core_size); |
2884 | print_unload_info(m, mod); | |
2885 | ||
2886 | /* Informative for users. */ | |
2887 | seq_printf(m, " %s", | |
2888 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2889 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2890 | "Live"); | |
2891 | /* Used by oprofile and other similar tools. */ | |
2892 | seq_printf(m, " 0x%p", mod->module_core); | |
2893 | ||
fa3ba2e8 FM |
2894 | /* Taints info */ |
2895 | if (mod->taints) | |
21aa9280 | 2896 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 2897 | |
1da177e4 LT |
2898 | seq_printf(m, "\n"); |
2899 | return 0; | |
2900 | } | |
2901 | ||
2902 | /* Format: modulename size refcount deps address | |
2903 | ||
2904 | Where refcount is a number or -, and deps is a comma-separated list | |
2905 | of depends or -. | |
2906 | */ | |
3b5d5c6b | 2907 | static const struct seq_operations modules_op = { |
1da177e4 LT |
2908 | .start = m_start, |
2909 | .next = m_next, | |
2910 | .stop = m_stop, | |
2911 | .show = m_show | |
2912 | }; | |
2913 | ||
3b5d5c6b AD |
2914 | static int modules_open(struct inode *inode, struct file *file) |
2915 | { | |
2916 | return seq_open(file, &modules_op); | |
2917 | } | |
2918 | ||
2919 | static const struct file_operations proc_modules_operations = { | |
2920 | .open = modules_open, | |
2921 | .read = seq_read, | |
2922 | .llseek = seq_lseek, | |
2923 | .release = seq_release, | |
2924 | }; | |
2925 | ||
2926 | static int __init proc_modules_init(void) | |
2927 | { | |
2928 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
2929 | return 0; | |
2930 | } | |
2931 | module_init(proc_modules_init); | |
2932 | #endif | |
2933 | ||
1da177e4 LT |
2934 | /* Given an address, look for it in the module exception tables. */ |
2935 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2936 | { | |
1da177e4 LT |
2937 | const struct exception_table_entry *e = NULL; |
2938 | struct module *mod; | |
2939 | ||
24da1cbf | 2940 | preempt_disable(); |
d72b3751 | 2941 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
2942 | if (mod->num_exentries == 0) |
2943 | continue; | |
22a8bdeb | 2944 | |
1da177e4 LT |
2945 | e = search_extable(mod->extable, |
2946 | mod->extable + mod->num_exentries - 1, | |
2947 | addr); | |
2948 | if (e) | |
2949 | break; | |
2950 | } | |
24da1cbf | 2951 | preempt_enable(); |
1da177e4 LT |
2952 | |
2953 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 2954 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
2955 | return e; |
2956 | } | |
2957 | ||
4d435f9d | 2958 | /* |
e610499e RR |
2959 | * is_module_address - is this address inside a module? |
2960 | * @addr: the address to check. | |
2961 | * | |
2962 | * See is_module_text_address() if you simply want to see if the address | |
2963 | * is code (not data). | |
4d435f9d | 2964 | */ |
e610499e | 2965 | bool is_module_address(unsigned long addr) |
4d435f9d | 2966 | { |
e610499e | 2967 | bool ret; |
4d435f9d | 2968 | |
24da1cbf | 2969 | preempt_disable(); |
e610499e | 2970 | ret = __module_address(addr) != NULL; |
24da1cbf | 2971 | preempt_enable(); |
4d435f9d | 2972 | |
e610499e | 2973 | return ret; |
4d435f9d IM |
2974 | } |
2975 | ||
e610499e RR |
2976 | /* |
2977 | * __module_address - get the module which contains an address. | |
2978 | * @addr: the address. | |
2979 | * | |
2980 | * Must be called with preempt disabled or module mutex held so that | |
2981 | * module doesn't get freed during this. | |
2982 | */ | |
714f83d5 | 2983 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
2984 | { |
2985 | struct module *mod; | |
2986 | ||
3a642e99 RR |
2987 | if (addr < module_addr_min || addr > module_addr_max) |
2988 | return NULL; | |
2989 | ||
d72b3751 | 2990 | list_for_each_entry_rcu(mod, &modules, list) |
e610499e RR |
2991 | if (within_module_core(addr, mod) |
2992 | || within_module_init(addr, mod)) | |
1da177e4 LT |
2993 | return mod; |
2994 | return NULL; | |
2995 | } | |
c6b37801 | 2996 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 2997 | |
e610499e RR |
2998 | /* |
2999 | * is_module_text_address - is this address inside module code? | |
3000 | * @addr: the address to check. | |
3001 | * | |
3002 | * See is_module_address() if you simply want to see if the address is | |
3003 | * anywhere in a module. See kernel_text_address() for testing if an | |
3004 | * address corresponds to kernel or module code. | |
3005 | */ | |
3006 | bool is_module_text_address(unsigned long addr) | |
3007 | { | |
3008 | bool ret; | |
3009 | ||
3010 | preempt_disable(); | |
3011 | ret = __module_text_address(addr) != NULL; | |
3012 | preempt_enable(); | |
3013 | ||
3014 | return ret; | |
3015 | } | |
3016 | ||
3017 | /* | |
3018 | * __module_text_address - get the module whose code contains an address. | |
3019 | * @addr: the address. | |
3020 | * | |
3021 | * Must be called with preempt disabled or module mutex held so that | |
3022 | * module doesn't get freed during this. | |
3023 | */ | |
3024 | struct module *__module_text_address(unsigned long addr) | |
3025 | { | |
3026 | struct module *mod = __module_address(addr); | |
3027 | if (mod) { | |
3028 | /* Make sure it's within the text section. */ | |
3029 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3030 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3031 | mod = NULL; | |
3032 | } | |
3033 | return mod; | |
3034 | } | |
c6b37801 | 3035 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3036 | |
1da177e4 LT |
3037 | /* Don't grab lock, we're oopsing. */ |
3038 | void print_modules(void) | |
3039 | { | |
3040 | struct module *mod; | |
2bc2d61a | 3041 | char buf[8]; |
1da177e4 | 3042 | |
b231125a | 3043 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3044 | /* Most callers should already have preempt disabled, but make sure */ |
3045 | preempt_disable(); | |
3046 | list_for_each_entry_rcu(mod, &modules, list) | |
21aa9280 | 3047 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b3751 | 3048 | preempt_enable(); |
e14af7ee AV |
3049 | if (last_unloaded_module[0]) |
3050 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3051 | printk("\n"); |
3052 | } | |
3053 | ||
1da177e4 | 3054 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3055 | /* Generate the signature for all relevant module structures here. |
3056 | * If these change, we don't want to try to parse the module. */ | |
3057 | void module_layout(struct module *mod, | |
3058 | struct modversion_info *ver, | |
3059 | struct kernel_param *kp, | |
3060 | struct kernel_symbol *ks, | |
8c8ef42a RR |
3061 | struct tracepoint *tp) |
3062 | { | |
3063 | } | |
3064 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3065 | #endif |
8256e47c | 3066 | |
97e1c18e MD |
3067 | #ifdef CONFIG_TRACEPOINTS |
3068 | void module_update_tracepoints(void) | |
3069 | { | |
3070 | struct module *mod; | |
3071 | ||
3072 | mutex_lock(&module_mutex); | |
3073 | list_for_each_entry(mod, &modules, list) | |
3074 | if (!mod->taints) | |
3075 | tracepoint_update_probe_range(mod->tracepoints, | |
3076 | mod->tracepoints + mod->num_tracepoints); | |
3077 | mutex_unlock(&module_mutex); | |
3078 | } | |
3079 | ||
3080 | /* | |
3081 | * Returns 0 if current not found. | |
3082 | * Returns 1 if current found. | |
3083 | */ | |
3084 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) | |
3085 | { | |
3086 | struct module *iter_mod; | |
3087 | int found = 0; | |
3088 | ||
3089 | mutex_lock(&module_mutex); | |
3090 | list_for_each_entry(iter_mod, &modules, list) { | |
3091 | if (!iter_mod->taints) { | |
3092 | /* | |
3093 | * Sorted module list | |
3094 | */ | |
3095 | if (iter_mod < iter->module) | |
3096 | continue; | |
3097 | else if (iter_mod > iter->module) | |
3098 | iter->tracepoint = NULL; | |
3099 | found = tracepoint_get_iter_range(&iter->tracepoint, | |
3100 | iter_mod->tracepoints, | |
3101 | iter_mod->tracepoints | |
3102 | + iter_mod->num_tracepoints); | |
3103 | if (found) { | |
3104 | iter->module = iter_mod; | |
3105 | break; | |
3106 | } | |
3107 | } | |
3108 | } | |
3109 | mutex_unlock(&module_mutex); | |
3110 | return found; | |
3111 | } | |
3112 | #endif |