Commit | Line | Data |
---|---|---|
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 | ||
75676500 RR |
75 | /* |
76 | * Mutex protects: | |
77 | * 1) List of modules (also safely readable with preempt_disable), | |
78 | * 2) module_use links, | |
79 | * 3) module_addr_min/module_addr_max. | |
d72b3751 | 80 | * (delete uses stop_machine/add uses RCU list operations). */ |
c6b37801 TA |
81 | DEFINE_MUTEX(module_mutex); |
82 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 83 | static LIST_HEAD(modules); |
67fc4e0c JW |
84 | #ifdef CONFIG_KGDB_KDB |
85 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
86 | #endif /* CONFIG_KGDB_KDB */ | |
87 | ||
1da177e4 | 88 | |
19e4529e SR |
89 | /* Block module loading/unloading? */ |
90 | int modules_disabled = 0; | |
91 | ||
c9a3ba55 RR |
92 | /* Waiting for a module to finish initializing? */ |
93 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
94 | ||
e041c683 | 95 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 96 | |
75676500 RR |
97 | /* Bounds of module allocation, for speeding __module_address. |
98 | * Protected by module_mutex. */ | |
3a642e99 RR |
99 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
100 | ||
1da177e4 LT |
101 | int register_module_notifier(struct notifier_block * nb) |
102 | { | |
e041c683 | 103 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
104 | } |
105 | EXPORT_SYMBOL(register_module_notifier); | |
106 | ||
107 | int unregister_module_notifier(struct notifier_block * nb) | |
108 | { | |
e041c683 | 109 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
110 | } |
111 | EXPORT_SYMBOL(unregister_module_notifier); | |
112 | ||
9a4b9708 ML |
113 | /* We require a truly strong try_module_get(): 0 means failure due to |
114 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
115 | static inline int strong_try_module_get(struct module *mod) |
116 | { | |
117 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
118 | return -EBUSY; |
119 | if (try_module_get(mod)) | |
1da177e4 | 120 | return 0; |
c9a3ba55 RR |
121 | else |
122 | return -ENOENT; | |
1da177e4 LT |
123 | } |
124 | ||
fa3ba2e8 FM |
125 | static inline void add_taint_module(struct module *mod, unsigned flag) |
126 | { | |
127 | add_taint(flag); | |
25ddbb18 | 128 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
129 | } |
130 | ||
02a3e59a RD |
131 | /* |
132 | * A thread that wants to hold a reference to a module only while it | |
133 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
134 | */ |
135 | void __module_put_and_exit(struct module *mod, long code) | |
136 | { | |
137 | module_put(mod); | |
138 | do_exit(code); | |
139 | } | |
140 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 141 | |
1da177e4 LT |
142 | /* Find a module section: 0 means not found. */ |
143 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
144 | Elf_Shdr *sechdrs, | |
145 | const char *secstrings, | |
146 | const char *name) | |
147 | { | |
148 | unsigned int i; | |
149 | ||
150 | for (i = 1; i < hdr->e_shnum; i++) | |
151 | /* Alloc bit cleared means "ignore it." */ | |
152 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
153 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
154 | return i; | |
155 | return 0; | |
156 | } | |
157 | ||
5e458cc0 RR |
158 | /* Find a module section, or NULL. */ |
159 | static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs, | |
160 | const char *secstrings, const char *name) | |
161 | { | |
162 | /* Section 0 has sh_addr 0. */ | |
163 | return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr; | |
164 | } | |
165 | ||
166 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
167 | static void *section_objs(Elf_Ehdr *hdr, | |
168 | Elf_Shdr *sechdrs, | |
169 | const char *secstrings, | |
170 | const char *name, | |
171 | size_t object_size, | |
172 | unsigned int *num) | |
173 | { | |
174 | unsigned int sec = find_sec(hdr, sechdrs, secstrings, name); | |
175 | ||
176 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
177 | *num = sechdrs[sec].sh_size / object_size; | |
178 | return (void *)sechdrs[sec].sh_addr; | |
179 | } | |
180 | ||
1da177e4 LT |
181 | /* Provided by the linker */ |
182 | extern const struct kernel_symbol __start___ksymtab[]; | |
183 | extern const struct kernel_symbol __stop___ksymtab[]; | |
184 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
185 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
186 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
187 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
188 | extern const unsigned long __start___kcrctab[]; |
189 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 190 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
191 | #ifdef CONFIG_UNUSED_SYMBOLS |
192 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
193 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
194 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
195 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
196 | extern const unsigned long __start___kcrctab_unused[]; |
197 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 198 | #endif |
1da177e4 LT |
199 | |
200 | #ifndef CONFIG_MODVERSIONS | |
201 | #define symversion(base, idx) NULL | |
202 | #else | |
f83ca9fe | 203 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
204 | #endif |
205 | ||
dafd0940 RR |
206 | static bool each_symbol_in_section(const struct symsearch *arr, |
207 | unsigned int arrsize, | |
208 | struct module *owner, | |
209 | bool (*fn)(const struct symsearch *syms, | |
210 | struct module *owner, | |
211 | unsigned int symnum, void *data), | |
212 | void *data) | |
ad9546c9 | 213 | { |
dafd0940 | 214 | unsigned int i, j; |
ad9546c9 | 215 | |
dafd0940 RR |
216 | for (j = 0; j < arrsize; j++) { |
217 | for (i = 0; i < arr[j].stop - arr[j].start; i++) | |
218 | if (fn(&arr[j], owner, i, data)) | |
219 | return true; | |
f71d20e9 | 220 | } |
dafd0940 RR |
221 | |
222 | return false; | |
ad9546c9 RR |
223 | } |
224 | ||
dafd0940 | 225 | /* Returns true as soon as fn returns true, otherwise false. */ |
c6b37801 TA |
226 | bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner, |
227 | unsigned int symnum, void *data), void *data) | |
ad9546c9 RR |
228 | { |
229 | struct module *mod; | |
ad9546c9 RR |
230 | const struct symsearch arr[] = { |
231 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, | |
dafd0940 | 232 | NOT_GPL_ONLY, false }, |
ad9546c9 | 233 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
234 | __start___kcrctab_gpl, |
235 | GPL_ONLY, false }, | |
ad9546c9 | 236 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
237 | __start___kcrctab_gpl_future, |
238 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 239 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 240 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
241 | __start___kcrctab_unused, |
242 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 243 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
244 | __start___kcrctab_unused_gpl, |
245 | GPL_ONLY, true }, | |
f7f5b675 | 246 | #endif |
ad9546c9 | 247 | }; |
f71d20e9 | 248 | |
dafd0940 RR |
249 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
250 | return true; | |
f71d20e9 | 251 | |
d72b3751 | 252 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
253 | struct symsearch arr[] = { |
254 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 255 | NOT_GPL_ONLY, false }, |
ad9546c9 | 256 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
257 | mod->gpl_crcs, |
258 | GPL_ONLY, false }, | |
ad9546c9 RR |
259 | { mod->gpl_future_syms, |
260 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
261 | mod->gpl_future_crcs, |
262 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 263 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
264 | { mod->unused_syms, |
265 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
266 | mod->unused_crcs, |
267 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
268 | { mod->unused_gpl_syms, |
269 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
270 | mod->unused_gpl_crcs, |
271 | GPL_ONLY, true }, | |
f7f5b675 | 272 | #endif |
ad9546c9 RR |
273 | }; |
274 | ||
dafd0940 RR |
275 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
276 | return true; | |
277 | } | |
278 | return false; | |
279 | } | |
c6b37801 | 280 | EXPORT_SYMBOL_GPL(each_symbol); |
dafd0940 RR |
281 | |
282 | struct find_symbol_arg { | |
283 | /* Input */ | |
284 | const char *name; | |
285 | bool gplok; | |
286 | bool warn; | |
287 | ||
288 | /* Output */ | |
289 | struct module *owner; | |
290 | const unsigned long *crc; | |
414fd31b | 291 | const struct kernel_symbol *sym; |
dafd0940 RR |
292 | }; |
293 | ||
294 | static bool find_symbol_in_section(const struct symsearch *syms, | |
295 | struct module *owner, | |
296 | unsigned int symnum, void *data) | |
297 | { | |
298 | struct find_symbol_arg *fsa = data; | |
299 | ||
300 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) | |
301 | return false; | |
302 | ||
303 | if (!fsa->gplok) { | |
304 | if (syms->licence == GPL_ONLY) | |
305 | return false; | |
306 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
307 | printk(KERN_WARNING "Symbol %s is being used " | |
308 | "by a non-GPL module, which will not " | |
309 | "be allowed in the future\n", fsa->name); | |
310 | printk(KERN_WARNING "Please see the file " | |
311 | "Documentation/feature-removal-schedule.txt " | |
312 | "in the kernel source tree for more details.\n"); | |
9f28bb7e | 313 | } |
1da177e4 | 314 | } |
ad9546c9 | 315 | |
f7f5b675 | 316 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
317 | if (syms->unused && fsa->warn) { |
318 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
319 | "however this module is using it.\n", fsa->name); | |
320 | printk(KERN_WARNING | |
321 | "This symbol will go away in the future.\n"); | |
322 | printk(KERN_WARNING | |
323 | "Please evalute if this is the right api to use and if " | |
324 | "it really is, submit a report the linux kernel " | |
325 | "mailinglist together with submitting your code for " | |
326 | "inclusion.\n"); | |
327 | } | |
f7f5b675 | 328 | #endif |
dafd0940 RR |
329 | |
330 | fsa->owner = owner; | |
331 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 332 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
333 | return true; |
334 | } | |
335 | ||
414fd31b | 336 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 337 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
338 | const struct kernel_symbol *find_symbol(const char *name, |
339 | struct module **owner, | |
340 | const unsigned long **crc, | |
341 | bool gplok, | |
342 | bool warn) | |
dafd0940 RR |
343 | { |
344 | struct find_symbol_arg fsa; | |
345 | ||
346 | fsa.name = name; | |
347 | fsa.gplok = gplok; | |
348 | fsa.warn = warn; | |
349 | ||
350 | if (each_symbol(find_symbol_in_section, &fsa)) { | |
351 | if (owner) | |
352 | *owner = fsa.owner; | |
353 | if (crc) | |
354 | *crc = fsa.crc; | |
414fd31b | 355 | return fsa.sym; |
dafd0940 RR |
356 | } |
357 | ||
1da177e4 | 358 | DEBUGP("Failed to find symbol %s\n", name); |
414fd31b | 359 | return NULL; |
1da177e4 | 360 | } |
c6b37801 | 361 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 362 | |
1da177e4 | 363 | /* Search for module by name: must hold module_mutex. */ |
c6b37801 | 364 | struct module *find_module(const char *name) |
1da177e4 LT |
365 | { |
366 | struct module *mod; | |
367 | ||
368 | list_for_each_entry(mod, &modules, list) { | |
369 | if (strcmp(mod->name, name) == 0) | |
370 | return mod; | |
371 | } | |
372 | return NULL; | |
373 | } | |
c6b37801 | 374 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
375 | |
376 | #ifdef CONFIG_SMP | |
fbf59bc9 | 377 | |
259354de | 378 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 379 | { |
259354de TH |
380 | return mod->percpu; |
381 | } | |
fbf59bc9 | 382 | |
259354de TH |
383 | static int percpu_modalloc(struct module *mod, |
384 | unsigned long size, unsigned long align) | |
385 | { | |
fbf59bc9 TH |
386 | if (align > PAGE_SIZE) { |
387 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
259354de | 388 | mod->name, align, PAGE_SIZE); |
fbf59bc9 TH |
389 | align = PAGE_SIZE; |
390 | } | |
391 | ||
259354de TH |
392 | mod->percpu = __alloc_reserved_percpu(size, align); |
393 | if (!mod->percpu) { | |
fbf59bc9 TH |
394 | printk(KERN_WARNING |
395 | "Could not allocate %lu bytes percpu data\n", size); | |
259354de TH |
396 | return -ENOMEM; |
397 | } | |
398 | mod->percpu_size = size; | |
399 | return 0; | |
fbf59bc9 TH |
400 | } |
401 | ||
259354de | 402 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 403 | { |
259354de | 404 | free_percpu(mod->percpu); |
fbf59bc9 TH |
405 | } |
406 | ||
6b588c18 TH |
407 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, |
408 | Elf_Shdr *sechdrs, | |
409 | const char *secstrings) | |
410 | { | |
3d9a854c | 411 | return find_sec(hdr, sechdrs, secstrings, ".data..percpu"); |
6b588c18 TH |
412 | } |
413 | ||
259354de TH |
414 | static void percpu_modcopy(struct module *mod, |
415 | const void *from, unsigned long size) | |
6b588c18 TH |
416 | { |
417 | int cpu; | |
418 | ||
419 | for_each_possible_cpu(cpu) | |
259354de | 420 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
421 | } |
422 | ||
10fad5e4 TH |
423 | /** |
424 | * is_module_percpu_address - test whether address is from module static percpu | |
425 | * @addr: address to test | |
426 | * | |
427 | * Test whether @addr belongs to module static percpu area. | |
428 | * | |
429 | * RETURNS: | |
430 | * %true if @addr is from module static percpu area | |
431 | */ | |
432 | bool is_module_percpu_address(unsigned long addr) | |
433 | { | |
434 | struct module *mod; | |
435 | unsigned int cpu; | |
436 | ||
437 | preempt_disable(); | |
438 | ||
439 | list_for_each_entry_rcu(mod, &modules, list) { | |
440 | if (!mod->percpu_size) | |
441 | continue; | |
442 | for_each_possible_cpu(cpu) { | |
443 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
444 | ||
445 | if ((void *)addr >= start && | |
446 | (void *)addr < start + mod->percpu_size) { | |
447 | preempt_enable(); | |
448 | return true; | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
453 | preempt_enable(); | |
454 | return false; | |
6b588c18 TH |
455 | } |
456 | ||
1da177e4 | 457 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 458 | |
259354de | 459 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
460 | { |
461 | return NULL; | |
462 | } | |
259354de TH |
463 | static inline int percpu_modalloc(struct module *mod, |
464 | unsigned long size, unsigned long align) | |
465 | { | |
466 | return -ENOMEM; | |
467 | } | |
468 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 469 | { |
1da177e4 LT |
470 | } |
471 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
472 | Elf_Shdr *sechdrs, | |
473 | const char *secstrings) | |
474 | { | |
475 | return 0; | |
476 | } | |
259354de TH |
477 | static inline void percpu_modcopy(struct module *mod, |
478 | const void *from, unsigned long size) | |
1da177e4 LT |
479 | { |
480 | /* pcpusec should be 0, and size of that section should be 0. */ | |
481 | BUG_ON(size != 0); | |
482 | } | |
10fad5e4 TH |
483 | bool is_module_percpu_address(unsigned long addr) |
484 | { | |
485 | return false; | |
486 | } | |
6b588c18 | 487 | |
1da177e4 LT |
488 | #endif /* CONFIG_SMP */ |
489 | ||
c988d2b2 MD |
490 | #define MODINFO_ATTR(field) \ |
491 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
492 | { \ | |
493 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
494 | } \ | |
495 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
496 | struct module *mod, char *buffer) \ | |
497 | { \ | |
498 | return sprintf(buffer, "%s\n", mod->field); \ | |
499 | } \ | |
500 | static int modinfo_##field##_exists(struct module *mod) \ | |
501 | { \ | |
502 | return mod->field != NULL; \ | |
503 | } \ | |
504 | static void free_modinfo_##field(struct module *mod) \ | |
505 | { \ | |
22a8bdeb DW |
506 | kfree(mod->field); \ |
507 | mod->field = NULL; \ | |
c988d2b2 MD |
508 | } \ |
509 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 510 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
511 | .show = show_modinfo_##field, \ |
512 | .setup = setup_modinfo_##field, \ | |
513 | .test = modinfo_##field##_exists, \ | |
514 | .free = free_modinfo_##field, \ | |
515 | }; | |
516 | ||
517 | MODINFO_ATTR(version); | |
518 | MODINFO_ATTR(srcversion); | |
519 | ||
e14af7ee AV |
520 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
521 | ||
03e88ae1 | 522 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
523 | |
524 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
525 | ||
1da177e4 LT |
526 | /* Init the unload section of the module. */ |
527 | static void module_unload_init(struct module *mod) | |
528 | { | |
2c02dfe7 LT |
529 | INIT_LIST_HEAD(&mod->source_list); |
530 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 531 | |
1da177e4 | 532 | /* Hold reference count during initialization. */ |
5fbfb18d | 533 | __this_cpu_write(mod->refptr->incs, 1); |
1da177e4 LT |
534 | /* Backwards compatibility macros put refcount during init. */ |
535 | mod->waiter = current; | |
536 | } | |
537 | ||
1da177e4 LT |
538 | /* Does a already use b? */ |
539 | static int already_uses(struct module *a, struct module *b) | |
540 | { | |
541 | struct module_use *use; | |
542 | ||
2c02dfe7 LT |
543 | list_for_each_entry(use, &b->source_list, source_list) { |
544 | if (use->source == a) { | |
1da177e4 LT |
545 | DEBUGP("%s uses %s!\n", a->name, b->name); |
546 | return 1; | |
547 | } | |
548 | } | |
549 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
550 | return 0; | |
551 | } | |
552 | ||
2c02dfe7 LT |
553 | /* |
554 | * Module a uses b | |
555 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
556 | * - the module_use is added to the list of 'b' sources (so | |
557 | * 'b' can walk the list to see who sourced them), and of 'a' | |
558 | * targets (so 'a' can see what modules it targets). | |
559 | */ | |
560 | static int add_module_usage(struct module *a, struct module *b) | |
561 | { | |
2c02dfe7 LT |
562 | struct module_use *use; |
563 | ||
564 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
565 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
566 | if (!use) { | |
567 | printk(KERN_WARNING "%s: out of memory loading\n", a->name); | |
568 | return -ENOMEM; | |
569 | } | |
570 | ||
571 | use->source = a; | |
572 | use->target = b; | |
573 | list_add(&use->source_list, &b->source_list); | |
574 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
575 | return 0; |
576 | } | |
577 | ||
75676500 | 578 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 579 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 580 | { |
c8e21ced | 581 | int err; |
270a6c4c | 582 | |
9bea7f23 | 583 | if (b == NULL || already_uses(a, b)) |
218ce735 | 584 | return 0; |
218ce735 | 585 | |
9bea7f23 RR |
586 | /* If module isn't available, we fail. */ |
587 | err = strong_try_module_get(b); | |
c9a3ba55 | 588 | if (err) |
9bea7f23 | 589 | return err; |
1da177e4 | 590 | |
2c02dfe7 LT |
591 | err = add_module_usage(a, b); |
592 | if (err) { | |
1da177e4 | 593 | module_put(b); |
9bea7f23 | 594 | return err; |
1da177e4 | 595 | } |
9bea7f23 | 596 | return 0; |
1da177e4 | 597 | } |
9bea7f23 | 598 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
599 | |
600 | /* Clear the unload stuff of the module. */ | |
601 | static void module_unload_free(struct module *mod) | |
602 | { | |
2c02dfe7 | 603 | struct module_use *use, *tmp; |
1da177e4 | 604 | |
75676500 | 605 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
606 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
607 | struct module *i = use->target; | |
608 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
609 | module_put(i); | |
610 | list_del(&use->source_list); | |
611 | list_del(&use->target_list); | |
612 | kfree(use); | |
1da177e4 | 613 | } |
75676500 | 614 | mutex_unlock(&module_mutex); |
1da177e4 LT |
615 | } |
616 | ||
617 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 618 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
619 | { |
620 | int ret = (flags & O_TRUNC); | |
621 | if (ret) | |
fb169793 | 622 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
623 | return ret; |
624 | } | |
625 | #else | |
fb169793 | 626 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
627 | { |
628 | return 0; | |
629 | } | |
630 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
631 | ||
632 | struct stopref | |
633 | { | |
634 | struct module *mod; | |
635 | int flags; | |
636 | int *forced; | |
637 | }; | |
638 | ||
639 | /* Whole machine is stopped with interrupts off when this runs. */ | |
640 | static int __try_stop_module(void *_sref) | |
641 | { | |
642 | struct stopref *sref = _sref; | |
643 | ||
da39ba5e RR |
644 | /* If it's not unused, quit unless we're forcing. */ |
645 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 646 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
647 | return -EWOULDBLOCK; |
648 | } | |
649 | ||
650 | /* Mark it as dying. */ | |
651 | sref->mod->state = MODULE_STATE_GOING; | |
652 | return 0; | |
653 | } | |
654 | ||
655 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
656 | { | |
da39ba5e RR |
657 | if (flags & O_NONBLOCK) { |
658 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 659 | |
9b1a4d38 | 660 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
661 | } else { |
662 | /* We don't need to stop the machine for this. */ | |
663 | mod->state = MODULE_STATE_GOING; | |
664 | synchronize_sched(); | |
665 | return 0; | |
666 | } | |
1da177e4 LT |
667 | } |
668 | ||
669 | unsigned int module_refcount(struct module *mod) | |
670 | { | |
5fbfb18d | 671 | unsigned int incs = 0, decs = 0; |
720eba31 | 672 | int cpu; |
1da177e4 | 673 | |
720eba31 | 674 | for_each_possible_cpu(cpu) |
5fbfb18d NP |
675 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
676 | /* | |
677 | * ensure the incs are added up after the decs. | |
678 | * module_put ensures incs are visible before decs with smp_wmb. | |
679 | * | |
680 | * This 2-count scheme avoids the situation where the refcount | |
681 | * for CPU0 is read, then CPU0 increments the module refcount, | |
682 | * then CPU1 drops that refcount, then the refcount for CPU1 is | |
683 | * read. We would record a decrement but not its corresponding | |
684 | * increment so we would see a low count (disaster). | |
685 | * | |
686 | * Rare situation? But module_refcount can be preempted, and we | |
687 | * might be tallying up 4096+ CPUs. So it is not impossible. | |
688 | */ | |
689 | smp_rmb(); | |
690 | for_each_possible_cpu(cpu) | |
691 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; | |
692 | return incs - decs; | |
1da177e4 LT |
693 | } |
694 | EXPORT_SYMBOL(module_refcount); | |
695 | ||
696 | /* This exists whether we can unload or not */ | |
697 | static void free_module(struct module *mod); | |
698 | ||
699 | static void wait_for_zero_refcount(struct module *mod) | |
700 | { | |
a6550207 | 701 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 702 | mutex_unlock(&module_mutex); |
1da177e4 LT |
703 | for (;;) { |
704 | DEBUGP("Looking at refcount...\n"); | |
705 | set_current_state(TASK_UNINTERRUPTIBLE); | |
706 | if (module_refcount(mod) == 0) | |
707 | break; | |
708 | schedule(); | |
709 | } | |
710 | current->state = TASK_RUNNING; | |
6389a385 | 711 | mutex_lock(&module_mutex); |
1da177e4 LT |
712 | } |
713 | ||
17da2bd9 HC |
714 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
715 | unsigned int, flags) | |
1da177e4 LT |
716 | { |
717 | struct module *mod; | |
dfff0a06 | 718 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
719 | int ret, forced = 0; |
720 | ||
3d43321b | 721 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
722 | return -EPERM; |
723 | ||
724 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
725 | return -EFAULT; | |
726 | name[MODULE_NAME_LEN-1] = '\0'; | |
727 | ||
3fc1f1e2 TH |
728 | if (mutex_lock_interruptible(&module_mutex) != 0) |
729 | return -EINTR; | |
1da177e4 LT |
730 | |
731 | mod = find_module(name); | |
732 | if (!mod) { | |
733 | ret = -ENOENT; | |
734 | goto out; | |
735 | } | |
736 | ||
2c02dfe7 | 737 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
738 | /* Other modules depend on us: get rid of them first. */ |
739 | ret = -EWOULDBLOCK; | |
740 | goto out; | |
741 | } | |
742 | ||
743 | /* Doing init or already dying? */ | |
744 | if (mod->state != MODULE_STATE_LIVE) { | |
745 | /* FIXME: if (force), slam module count and wake up | |
746 | waiter --RR */ | |
747 | DEBUGP("%s already dying\n", mod->name); | |
748 | ret = -EBUSY; | |
749 | goto out; | |
750 | } | |
751 | ||
752 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 753 | if (mod->init && !mod->exit) { |
fb169793 | 754 | forced = try_force_unload(flags); |
1da177e4 LT |
755 | if (!forced) { |
756 | /* This module can't be removed */ | |
757 | ret = -EBUSY; | |
758 | goto out; | |
759 | } | |
760 | } | |
761 | ||
762 | /* Set this up before setting mod->state */ | |
763 | mod->waiter = current; | |
764 | ||
765 | /* Stop the machine so refcounts can't move and disable module. */ | |
766 | ret = try_stop_module(mod, flags, &forced); | |
767 | if (ret != 0) | |
768 | goto out; | |
769 | ||
770 | /* Never wait if forced. */ | |
771 | if (!forced && module_refcount(mod) != 0) | |
772 | wait_for_zero_refcount(mod); | |
773 | ||
df4b565e | 774 | mutex_unlock(&module_mutex); |
1da177e4 | 775 | /* Final destruction now noone is using it. */ |
df4b565e | 776 | if (mod->exit != NULL) |
1da177e4 | 777 | mod->exit(); |
df4b565e PO |
778 | blocking_notifier_call_chain(&module_notify_list, |
779 | MODULE_STATE_GOING, mod); | |
22a9d645 | 780 | async_synchronize_full(); |
75676500 | 781 | |
e14af7ee | 782 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 783 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 784 | |
75676500 RR |
785 | free_module(mod); |
786 | return 0; | |
787 | out: | |
6389a385 | 788 | mutex_unlock(&module_mutex); |
1da177e4 LT |
789 | return ret; |
790 | } | |
791 | ||
d1e99d7a | 792 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
793 | { |
794 | struct module_use *use; | |
795 | int printed_something = 0; | |
796 | ||
797 | seq_printf(m, " %u ", module_refcount(mod)); | |
798 | ||
799 | /* Always include a trailing , so userspace can differentiate | |
800 | between this and the old multi-field proc format. */ | |
2c02dfe7 | 801 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 802 | printed_something = 1; |
2c02dfe7 | 803 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
804 | } |
805 | ||
1da177e4 LT |
806 | if (mod->init != NULL && mod->exit == NULL) { |
807 | printed_something = 1; | |
808 | seq_printf(m, "[permanent],"); | |
809 | } | |
810 | ||
811 | if (!printed_something) | |
812 | seq_printf(m, "-"); | |
813 | } | |
814 | ||
815 | void __symbol_put(const char *symbol) | |
816 | { | |
817 | struct module *owner; | |
1da177e4 | 818 | |
24da1cbf | 819 | preempt_disable(); |
414fd31b | 820 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
821 | BUG(); |
822 | module_put(owner); | |
24da1cbf | 823 | preempt_enable(); |
1da177e4 LT |
824 | } |
825 | EXPORT_SYMBOL(__symbol_put); | |
826 | ||
7d1d16e4 | 827 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
828 | void symbol_put_addr(void *addr) |
829 | { | |
5e376613 | 830 | struct module *modaddr; |
7d1d16e4 | 831 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 832 | |
7d1d16e4 | 833 | if (core_kernel_text(a)) |
5e376613 | 834 | return; |
1da177e4 | 835 | |
a6e6abd5 RR |
836 | /* module_text_address is safe here: we're supposed to have reference |
837 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 838 | modaddr = __module_text_address(a); |
a6e6abd5 | 839 | BUG_ON(!modaddr); |
5e376613 | 840 | module_put(modaddr); |
1da177e4 LT |
841 | } |
842 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
843 | ||
844 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
845 | struct module *mod, char *buffer) | |
846 | { | |
256e2fdf | 847 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
848 | } |
849 | ||
850 | static struct module_attribute refcnt = { | |
7b595756 | 851 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
852 | .show = show_refcnt, |
853 | }; | |
854 | ||
f6a57033 AV |
855 | void module_put(struct module *module) |
856 | { | |
857 | if (module) { | |
e1783a24 | 858 | preempt_disable(); |
5fbfb18d NP |
859 | smp_wmb(); /* see comment in module_refcount */ |
860 | __this_cpu_inc(module->refptr->decs); | |
e1783a24 | 861 | |
ae832d1e | 862 | trace_module_put(module, _RET_IP_); |
f6a57033 AV |
863 | /* Maybe they're waiting for us to drop reference? */ |
864 | if (unlikely(!module_is_live(module))) | |
865 | wake_up_process(module->waiter); | |
e1783a24 | 866 | preempt_enable(); |
f6a57033 AV |
867 | } |
868 | } | |
869 | EXPORT_SYMBOL(module_put); | |
870 | ||
1da177e4 | 871 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 872 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
873 | { |
874 | /* We don't know the usage count, or what modules are using. */ | |
875 | seq_printf(m, " - -"); | |
876 | } | |
877 | ||
878 | static inline void module_unload_free(struct module *mod) | |
879 | { | |
880 | } | |
881 | ||
9bea7f23 | 882 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 883 | { |
9bea7f23 | 884 | return strong_try_module_get(b); |
1da177e4 | 885 | } |
9bea7f23 | 886 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
887 | |
888 | static inline void module_unload_init(struct module *mod) | |
889 | { | |
890 | } | |
891 | #endif /* CONFIG_MODULE_UNLOAD */ | |
892 | ||
1f71740a KS |
893 | static ssize_t show_initstate(struct module_attribute *mattr, |
894 | struct module *mod, char *buffer) | |
895 | { | |
896 | const char *state = "unknown"; | |
897 | ||
898 | switch (mod->state) { | |
899 | case MODULE_STATE_LIVE: | |
900 | state = "live"; | |
901 | break; | |
902 | case MODULE_STATE_COMING: | |
903 | state = "coming"; | |
904 | break; | |
905 | case MODULE_STATE_GOING: | |
906 | state = "going"; | |
907 | break; | |
908 | } | |
909 | return sprintf(buffer, "%s\n", state); | |
910 | } | |
911 | ||
912 | static struct module_attribute initstate = { | |
7b595756 | 913 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
914 | .show = show_initstate, |
915 | }; | |
916 | ||
03e88ae1 GKH |
917 | static struct module_attribute *modinfo_attrs[] = { |
918 | &modinfo_version, | |
919 | &modinfo_srcversion, | |
1f71740a | 920 | &initstate, |
03e88ae1 GKH |
921 | #ifdef CONFIG_MODULE_UNLOAD |
922 | &refcnt, | |
923 | #endif | |
924 | NULL, | |
925 | }; | |
926 | ||
1da177e4 LT |
927 | static const char vermagic[] = VERMAGIC_STRING; |
928 | ||
c6e665c8 | 929 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
930 | { |
931 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 932 | if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8 RR |
933 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
934 | mod->name, reason); | |
826e4506 LT |
935 | add_taint_module(mod, TAINT_FORCED_MODULE); |
936 | return 0; | |
937 | #else | |
938 | return -ENOEXEC; | |
939 | #endif | |
940 | } | |
941 | ||
1da177e4 | 942 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
943 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
944 | static unsigned long maybe_relocated(unsigned long crc, | |
945 | const struct module *crc_owner) | |
946 | { | |
947 | #ifdef ARCH_RELOCATES_KCRCTAB | |
948 | if (crc_owner == NULL) | |
949 | return crc - (unsigned long)reloc_start; | |
950 | #endif | |
951 | return crc; | |
952 | } | |
953 | ||
1da177e4 LT |
954 | static int check_version(Elf_Shdr *sechdrs, |
955 | unsigned int versindex, | |
956 | const char *symname, | |
957 | struct module *mod, | |
d4703aef RR |
958 | const unsigned long *crc, |
959 | const struct module *crc_owner) | |
1da177e4 LT |
960 | { |
961 | unsigned int i, num_versions; | |
962 | struct modversion_info *versions; | |
963 | ||
964 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
965 | if (!crc) | |
966 | return 1; | |
967 | ||
a5dd6970 RR |
968 | /* No versions at all? modprobe --force does this. */ |
969 | if (versindex == 0) | |
970 | return try_to_force_load(mod, symname) == 0; | |
971 | ||
1da177e4 LT |
972 | versions = (void *) sechdrs[versindex].sh_addr; |
973 | num_versions = sechdrs[versindex].sh_size | |
974 | / sizeof(struct modversion_info); | |
975 | ||
976 | for (i = 0; i < num_versions; i++) { | |
977 | if (strcmp(versions[i].name, symname) != 0) | |
978 | continue; | |
979 | ||
d4703aef | 980 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 981 | return 1; |
1da177e4 | 982 | DEBUGP("Found checksum %lX vs module %lX\n", |
d4703aef | 983 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 984 | goto bad_version; |
1da177e4 | 985 | } |
826e4506 | 986 | |
a5dd6970 RR |
987 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
988 | mod->name, symname); | |
989 | return 0; | |
826e4506 LT |
990 | |
991 | bad_version: | |
992 | printk("%s: disagrees about version of symbol %s\n", | |
993 | mod->name, symname); | |
994 | return 0; | |
1da177e4 LT |
995 | } |
996 | ||
997 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
998 | unsigned int versindex, | |
999 | struct module *mod) | |
1000 | { | |
1001 | const unsigned long *crc; | |
1da177e4 | 1002 | |
75676500 RR |
1003 | /* Since this should be found in kernel (which can't be removed), |
1004 | * no locking is necessary. */ | |
6560dc16 MF |
1005 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
1006 | &crc, true, false)) | |
1da177e4 | 1007 | BUG(); |
d4703aef RR |
1008 | return check_version(sechdrs, versindex, "module_layout", mod, crc, |
1009 | NULL); | |
1da177e4 LT |
1010 | } |
1011 | ||
91e37a79 RR |
1012 | /* First part is kernel version, which we ignore if module has crcs. */ |
1013 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1014 | bool has_crcs) | |
1da177e4 | 1015 | { |
91e37a79 RR |
1016 | if (has_crcs) { |
1017 | amagic += strcspn(amagic, " "); | |
1018 | bmagic += strcspn(bmagic, " "); | |
1019 | } | |
1da177e4 LT |
1020 | return strcmp(amagic, bmagic) == 0; |
1021 | } | |
1022 | #else | |
1023 | static inline int check_version(Elf_Shdr *sechdrs, | |
1024 | unsigned int versindex, | |
1025 | const char *symname, | |
1026 | struct module *mod, | |
d4703aef RR |
1027 | const unsigned long *crc, |
1028 | const struct module *crc_owner) | |
1da177e4 LT |
1029 | { |
1030 | return 1; | |
1031 | } | |
1032 | ||
1033 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1034 | unsigned int versindex, | |
1035 | struct module *mod) | |
1036 | { | |
1037 | return 1; | |
1038 | } | |
1039 | ||
91e37a79 RR |
1040 | static inline int same_magic(const char *amagic, const char *bmagic, |
1041 | bool has_crcs) | |
1da177e4 LT |
1042 | { |
1043 | return strcmp(amagic, bmagic) == 0; | |
1044 | } | |
1045 | #endif /* CONFIG_MODVERSIONS */ | |
1046 | ||
75676500 | 1047 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
414fd31b TA |
1048 | static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs, |
1049 | unsigned int versindex, | |
1050 | const char *name, | |
9bea7f23 RR |
1051 | struct module *mod, |
1052 | char ownername[]) | |
1da177e4 LT |
1053 | { |
1054 | struct module *owner; | |
414fd31b | 1055 | const struct kernel_symbol *sym; |
1da177e4 | 1056 | const unsigned long *crc; |
9bea7f23 | 1057 | int err; |
1da177e4 | 1058 | |
75676500 | 1059 | mutex_lock(&module_mutex); |
414fd31b | 1060 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1061 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1062 | if (!sym) |
1063 | goto unlock; | |
1064 | ||
1065 | if (!check_version(sechdrs, versindex, name, mod, crc, owner)) { | |
1066 | sym = ERR_PTR(-EINVAL); | |
1067 | goto getname; | |
1da177e4 | 1068 | } |
9bea7f23 RR |
1069 | |
1070 | err = ref_module(mod, owner); | |
1071 | if (err) { | |
1072 | sym = ERR_PTR(err); | |
1073 | goto getname; | |
1074 | } | |
1075 | ||
1076 | getname: | |
1077 | /* We must make copy under the lock if we failed to get ref. */ | |
1078 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1079 | unlock: | |
75676500 | 1080 | mutex_unlock(&module_mutex); |
218ce735 | 1081 | return sym; |
1da177e4 LT |
1082 | } |
1083 | ||
9bea7f23 RR |
1084 | static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs, |
1085 | unsigned int versindex, | |
1086 | const char *name, | |
1087 | struct module *mod) | |
1088 | { | |
1089 | const struct kernel_symbol *ksym; | |
1090 | char ownername[MODULE_NAME_LEN]; | |
1091 | ||
1092 | if (wait_event_interruptible_timeout(module_wq, | |
1093 | !IS_ERR(ksym = resolve_symbol(sechdrs, versindex, name, | |
1094 | mod, ownername)) || | |
1095 | PTR_ERR(ksym) != -EBUSY, | |
1096 | 30 * HZ) <= 0) { | |
1097 | printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n", | |
1098 | mod->name, ownername); | |
1099 | } | |
1100 | return ksym; | |
1101 | } | |
1102 | ||
1da177e4 LT |
1103 | /* |
1104 | * /sys/module/foo/sections stuff | |
1105 | * J. Corbet <corbet@lwn.net> | |
1106 | */ | |
120fc3d7 | 1107 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
10b465aa BH |
1108 | |
1109 | static inline bool sect_empty(const Elf_Shdr *sect) | |
1110 | { | |
1111 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1112 | } | |
1113 | ||
a58730c4 RR |
1114 | struct module_sect_attr |
1115 | { | |
1116 | struct module_attribute mattr; | |
1117 | char *name; | |
1118 | unsigned long address; | |
1119 | }; | |
1120 | ||
1121 | struct module_sect_attrs | |
1122 | { | |
1123 | struct attribute_group grp; | |
1124 | unsigned int nsections; | |
1125 | struct module_sect_attr attrs[0]; | |
1126 | }; | |
1127 | ||
1da177e4 LT |
1128 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1129 | struct module *mod, char *buf) | |
1130 | { | |
1131 | struct module_sect_attr *sattr = | |
1132 | container_of(mattr, struct module_sect_attr, mattr); | |
1133 | return sprintf(buf, "0x%lx\n", sattr->address); | |
1134 | } | |
1135 | ||
04b1db9f IN |
1136 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1137 | { | |
a58730c4 | 1138 | unsigned int section; |
04b1db9f IN |
1139 | |
1140 | for (section = 0; section < sect_attrs->nsections; section++) | |
1141 | kfree(sect_attrs->attrs[section].name); | |
1142 | kfree(sect_attrs); | |
1143 | } | |
1144 | ||
1da177e4 LT |
1145 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1146 | char *secstrings, Elf_Shdr *sechdrs) | |
1147 | { | |
1148 | unsigned int nloaded = 0, i, size[2]; | |
1149 | struct module_sect_attrs *sect_attrs; | |
1150 | struct module_sect_attr *sattr; | |
1151 | struct attribute **gattr; | |
22a8bdeb | 1152 | |
1da177e4 LT |
1153 | /* Count loaded sections and allocate structures */ |
1154 | for (i = 0; i < nsect; i++) | |
10b465aa | 1155 | if (!sect_empty(&sechdrs[i])) |
1da177e4 LT |
1156 | nloaded++; |
1157 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1158 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1159 | sizeof(sect_attrs->grp.attrs[0])); | |
1160 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1161 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1162 | if (sect_attrs == NULL) | |
1da177e4 LT |
1163 | return; |
1164 | ||
1165 | /* Setup section attributes. */ | |
1166 | sect_attrs->grp.name = "sections"; | |
1167 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1168 | ||
04b1db9f | 1169 | sect_attrs->nsections = 0; |
1da177e4 LT |
1170 | sattr = §_attrs->attrs[0]; |
1171 | gattr = §_attrs->grp.attrs[0]; | |
1172 | for (i = 0; i < nsect; i++) { | |
10b465aa | 1173 | if (sect_empty(&sechdrs[i])) |
35dead42 | 1174 | continue; |
1da177e4 | 1175 | sattr->address = sechdrs[i].sh_addr; |
04b1db9f IN |
1176 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1177 | GFP_KERNEL); | |
1178 | if (sattr->name == NULL) | |
1179 | goto out; | |
1180 | sect_attrs->nsections++; | |
361795b1 | 1181 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1182 | sattr->mattr.show = module_sect_show; |
1183 | sattr->mattr.store = NULL; | |
1184 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1185 | sattr->mattr.attr.mode = S_IRUGO; |
1186 | *(gattr++) = &(sattr++)->mattr.attr; | |
1187 | } | |
1188 | *gattr = NULL; | |
1189 | ||
1190 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1191 | goto out; | |
1192 | ||
1193 | mod->sect_attrs = sect_attrs; | |
1194 | return; | |
1195 | out: | |
04b1db9f | 1196 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1197 | } |
1198 | ||
1199 | static void remove_sect_attrs(struct module *mod) | |
1200 | { | |
1201 | if (mod->sect_attrs) { | |
1202 | sysfs_remove_group(&mod->mkobj.kobj, | |
1203 | &mod->sect_attrs->grp); | |
1204 | /* We are positive that no one is using any sect attrs | |
1205 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1206 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1207 | mod->sect_attrs = NULL; |
1208 | } | |
1209 | } | |
1210 | ||
6d760133 RM |
1211 | /* |
1212 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1213 | */ | |
1214 | ||
1215 | struct module_notes_attrs { | |
1216 | struct kobject *dir; | |
1217 | unsigned int notes; | |
1218 | struct bin_attribute attrs[0]; | |
1219 | }; | |
1220 | ||
2c3c8bea | 1221 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1222 | struct bin_attribute *bin_attr, |
1223 | char *buf, loff_t pos, size_t count) | |
1224 | { | |
1225 | /* | |
1226 | * The caller checked the pos and count against our size. | |
1227 | */ | |
1228 | memcpy(buf, bin_attr->private + pos, count); | |
1229 | return count; | |
1230 | } | |
1231 | ||
1232 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1233 | unsigned int i) | |
1234 | { | |
1235 | if (notes_attrs->dir) { | |
1236 | while (i-- > 0) | |
1237 | sysfs_remove_bin_file(notes_attrs->dir, | |
1238 | ¬es_attrs->attrs[i]); | |
e9432093 | 1239 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1240 | } |
1241 | kfree(notes_attrs); | |
1242 | } | |
1243 | ||
1244 | static void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1245 | char *secstrings, Elf_Shdr *sechdrs) | |
1246 | { | |
1247 | unsigned int notes, loaded, i; | |
1248 | struct module_notes_attrs *notes_attrs; | |
1249 | struct bin_attribute *nattr; | |
1250 | ||
ea6bff36 IM |
1251 | /* failed to create section attributes, so can't create notes */ |
1252 | if (!mod->sect_attrs) | |
1253 | return; | |
1254 | ||
6d760133 RM |
1255 | /* Count notes sections and allocate structures. */ |
1256 | notes = 0; | |
1257 | for (i = 0; i < nsect; i++) | |
10b465aa | 1258 | if (!sect_empty(&sechdrs[i]) && |
6d760133 RM |
1259 | (sechdrs[i].sh_type == SHT_NOTE)) |
1260 | ++notes; | |
1261 | ||
1262 | if (notes == 0) | |
1263 | return; | |
1264 | ||
1265 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1266 | + notes * sizeof(notes_attrs->attrs[0]), | |
1267 | GFP_KERNEL); | |
1268 | if (notes_attrs == NULL) | |
1269 | return; | |
1270 | ||
1271 | notes_attrs->notes = notes; | |
1272 | nattr = ¬es_attrs->attrs[0]; | |
1273 | for (loaded = i = 0; i < nsect; ++i) { | |
10b465aa | 1274 | if (sect_empty(&sechdrs[i])) |
6d760133 RM |
1275 | continue; |
1276 | if (sechdrs[i].sh_type == SHT_NOTE) { | |
361795b1 | 1277 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1278 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1279 | nattr->attr.mode = S_IRUGO; | |
1280 | nattr->size = sechdrs[i].sh_size; | |
1281 | nattr->private = (void *) sechdrs[i].sh_addr; | |
1282 | nattr->read = module_notes_read; | |
1283 | ++nattr; | |
1284 | } | |
1285 | ++loaded; | |
1286 | } | |
1287 | ||
4ff6abff | 1288 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1289 | if (!notes_attrs->dir) |
1290 | goto out; | |
1291 | ||
1292 | for (i = 0; i < notes; ++i) | |
1293 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1294 | ¬es_attrs->attrs[i])) | |
1295 | goto out; | |
1296 | ||
1297 | mod->notes_attrs = notes_attrs; | |
1298 | return; | |
1299 | ||
1300 | out: | |
1301 | free_notes_attrs(notes_attrs, i); | |
1302 | } | |
1303 | ||
1304 | static void remove_notes_attrs(struct module *mod) | |
1305 | { | |
1306 | if (mod->notes_attrs) | |
1307 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1308 | } | |
1309 | ||
1da177e4 | 1310 | #else |
04b1db9f | 1311 | |
1da177e4 LT |
1312 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1313 | char *sectstrings, Elf_Shdr *sechdrs) | |
1314 | { | |
1315 | } | |
1316 | ||
1317 | static inline void remove_sect_attrs(struct module *mod) | |
1318 | { | |
1319 | } | |
6d760133 RM |
1320 | |
1321 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1322 | char *sectstrings, Elf_Shdr *sechdrs) | |
1323 | { | |
1324 | } | |
1325 | ||
1326 | static inline void remove_notes_attrs(struct module *mod) | |
1327 | { | |
1328 | } | |
120fc3d7 | 1329 | #endif |
1da177e4 | 1330 | |
ef665c1a | 1331 | #ifdef CONFIG_SYSFS |
80a3d1bb RR |
1332 | static void add_usage_links(struct module *mod) |
1333 | { | |
1334 | #ifdef CONFIG_MODULE_UNLOAD | |
1335 | struct module_use *use; | |
1336 | int nowarn; | |
1337 | ||
75676500 | 1338 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1339 | list_for_each_entry(use, &mod->target_list, target_list) { |
1340 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1341 | &mod->mkobj.kobj, mod->name); | |
1342 | } | |
75676500 | 1343 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1344 | #endif |
1345 | } | |
1346 | ||
1347 | static void del_usage_links(struct module *mod) | |
1348 | { | |
1349 | #ifdef CONFIG_MODULE_UNLOAD | |
1350 | struct module_use *use; | |
1351 | ||
75676500 | 1352 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1353 | list_for_each_entry(use, &mod->target_list, target_list) |
1354 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1355 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1356 | #endif |
1357 | } | |
1358 | ||
6407ebb2 | 1359 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1360 | { |
1361 | struct module_attribute *attr; | |
03e88ae1 | 1362 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1363 | int error = 0; |
1364 | int i; | |
1365 | ||
03e88ae1 GKH |
1366 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1367 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1368 | GFP_KERNEL); | |
1369 | if (!mod->modinfo_attrs) | |
1370 | return -ENOMEM; | |
1371 | ||
1372 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1373 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1374 | if (!attr->test || | |
03e88ae1 GKH |
1375 | (attr->test && attr->test(mod))) { |
1376 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1377 | sysfs_attr_init(&temp_attr->attr); |
03e88ae1 GKH |
1378 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1379 | ++temp_attr; | |
1380 | } | |
c988d2b2 MD |
1381 | } |
1382 | return error; | |
1383 | } | |
1384 | ||
6407ebb2 | 1385 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1386 | { |
1387 | struct module_attribute *attr; | |
1388 | int i; | |
1389 | ||
03e88ae1 GKH |
1390 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1391 | /* pick a field to test for end of list */ | |
1392 | if (!attr->attr.name) | |
1393 | break; | |
c988d2b2 | 1394 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1395 | if (attr->free) |
1396 | attr->free(mod); | |
c988d2b2 | 1397 | } |
03e88ae1 | 1398 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1399 | } |
1da177e4 | 1400 | |
6407ebb2 | 1401 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1402 | { |
1403 | int err; | |
6494a93d | 1404 | struct kobject *kobj; |
1da177e4 | 1405 | |
823bccfc GKH |
1406 | if (!module_sysfs_initialized) { |
1407 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1408 | mod->name); |
1409 | err = -EINVAL; | |
1410 | goto out; | |
1411 | } | |
6494a93d GKH |
1412 | |
1413 | kobj = kset_find_obj(module_kset, mod->name); | |
1414 | if (kobj) { | |
1415 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1416 | kobject_put(kobj); | |
1417 | err = -EINVAL; | |
1418 | goto out; | |
1419 | } | |
1420 | ||
1da177e4 | 1421 | mod->mkobj.mod = mod; |
e17e0f51 | 1422 | |
ac3c8141 GKH |
1423 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1424 | mod->mkobj.kobj.kset = module_kset; | |
1425 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1426 | "%s", mod->name); | |
1427 | if (err) | |
1428 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1429 | |
97c146ef | 1430 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1431 | out: |
1432 | return err; | |
1433 | } | |
1434 | ||
6407ebb2 | 1435 | static int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1436 | struct kernel_param *kparam, |
1437 | unsigned int num_params) | |
1438 | { | |
1439 | int err; | |
1440 | ||
80a3d1bb RR |
1441 | err = mod_sysfs_init(mod); |
1442 | if (err) | |
1443 | goto out; | |
1444 | ||
4ff6abff | 1445 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1446 | if (!mod->holders_dir) { |
1447 | err = -ENOMEM; | |
270a6c4c | 1448 | goto out_unreg; |
240936e1 | 1449 | } |
270a6c4c | 1450 | |
1da177e4 LT |
1451 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1452 | if (err) | |
270a6c4c | 1453 | goto out_unreg_holders; |
1da177e4 | 1454 | |
c988d2b2 MD |
1455 | err = module_add_modinfo_attrs(mod); |
1456 | if (err) | |
e17e0f51 | 1457 | goto out_unreg_param; |
c988d2b2 | 1458 | |
80a3d1bb RR |
1459 | add_usage_links(mod); |
1460 | ||
e17e0f51 | 1461 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1462 | return 0; |
1463 | ||
e17e0f51 KS |
1464 | out_unreg_param: |
1465 | module_param_sysfs_remove(mod); | |
270a6c4c | 1466 | out_unreg_holders: |
78a2d906 | 1467 | kobject_put(mod->holders_dir); |
270a6c4c | 1468 | out_unreg: |
e17e0f51 | 1469 | kobject_put(&mod->mkobj.kobj); |
80a3d1bb | 1470 | out: |
1da177e4 LT |
1471 | return err; |
1472 | } | |
34e4e2fe DL |
1473 | |
1474 | static void mod_sysfs_fini(struct module *mod) | |
1475 | { | |
1476 | kobject_put(&mod->mkobj.kobj); | |
1477 | } | |
1478 | ||
1479 | #else /* CONFIG_SYSFS */ | |
1480 | ||
6407ebb2 RR |
1481 | static inline int mod_sysfs_init(struct module *mod) |
1482 | { | |
1483 | return 0; | |
1484 | } | |
1485 | ||
1486 | static inline int mod_sysfs_setup(struct module *mod, | |
1487 | struct kernel_param *kparam, | |
1488 | unsigned int num_params) | |
1489 | { | |
1490 | return 0; | |
1491 | } | |
1492 | ||
1493 | static inline int module_add_modinfo_attrs(struct module *mod) | |
1494 | { | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | static inline void module_remove_modinfo_attrs(struct module *mod) | |
1499 | { | |
1500 | } | |
1501 | ||
34e4e2fe DL |
1502 | static void mod_sysfs_fini(struct module *mod) |
1503 | { | |
1504 | } | |
1505 | ||
80a3d1bb RR |
1506 | static void del_usage_links(struct module *mod) |
1507 | { | |
1508 | } | |
1509 | ||
34e4e2fe | 1510 | #endif /* CONFIG_SYSFS */ |
1da177e4 LT |
1511 | |
1512 | static void mod_kobject_remove(struct module *mod) | |
1513 | { | |
80a3d1bb | 1514 | del_usage_links(mod); |
c988d2b2 | 1515 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1516 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1517 | kobject_put(mod->mkobj.drivers_dir); |
1518 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1519 | mod_sysfs_fini(mod); |
1da177e4 LT |
1520 | } |
1521 | ||
1522 | /* | |
1523 | * unlink the module with the whole machine is stopped with interrupts off | |
1524 | * - this defends against kallsyms not taking locks | |
1525 | */ | |
1526 | static int __unlink_module(void *_mod) | |
1527 | { | |
1528 | struct module *mod = _mod; | |
1529 | list_del(&mod->list); | |
1530 | return 0; | |
1531 | } | |
1532 | ||
75676500 | 1533 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1534 | static void free_module(struct module *mod) |
1535 | { | |
7ead8b83 LZ |
1536 | trace_module_free(mod); |
1537 | ||
1da177e4 | 1538 | /* Delete from various lists */ |
75676500 | 1539 | mutex_lock(&module_mutex); |
9b1a4d38 | 1540 | stop_machine(__unlink_module, mod, NULL); |
75676500 | 1541 | mutex_unlock(&module_mutex); |
6d760133 | 1542 | remove_notes_attrs(mod); |
1da177e4 LT |
1543 | remove_sect_attrs(mod); |
1544 | mod_kobject_remove(mod); | |
1545 | ||
b82bab4b JB |
1546 | /* Remove dynamic debug info */ |
1547 | ddebug_remove_module(mod->name); | |
1548 | ||
1da177e4 LT |
1549 | /* Arch-specific cleanup. */ |
1550 | module_arch_cleanup(mod); | |
1551 | ||
1552 | /* Module unload stuff */ | |
1553 | module_unload_free(mod); | |
1554 | ||
e180a6b7 RR |
1555 | /* Free any allocated parameters. */ |
1556 | destroy_params(mod->kp, mod->num_kp); | |
1557 | ||
1da177e4 LT |
1558 | /* This may be NULL, but that's OK */ |
1559 | module_free(mod, mod->module_init); | |
1560 | kfree(mod->args); | |
259354de | 1561 | percpu_modfree(mod); |
e1783a24 | 1562 | #if defined(CONFIG_MODULE_UNLOAD) |
720eba31 | 1563 | if (mod->refptr) |
e1783a24 | 1564 | free_percpu(mod->refptr); |
720eba31 | 1565 | #endif |
fbb9ce95 IM |
1566 | /* Free lock-classes: */ |
1567 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1568 | ||
1da177e4 LT |
1569 | /* Finally, free the core (containing the module structure) */ |
1570 | module_free(mod, mod->module_core); | |
eb8cdec4 BS |
1571 | |
1572 | #ifdef CONFIG_MPU | |
1573 | update_protections(current->mm); | |
1574 | #endif | |
1da177e4 LT |
1575 | } |
1576 | ||
1577 | void *__symbol_get(const char *symbol) | |
1578 | { | |
1579 | struct module *owner; | |
414fd31b | 1580 | const struct kernel_symbol *sym; |
1da177e4 | 1581 | |
24da1cbf | 1582 | preempt_disable(); |
414fd31b TA |
1583 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1584 | if (sym && strong_try_module_get(owner)) | |
1585 | sym = NULL; | |
24da1cbf | 1586 | preempt_enable(); |
1da177e4 | 1587 | |
414fd31b | 1588 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1589 | } |
1590 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1591 | ||
eea8b54d AN |
1592 | /* |
1593 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1594 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1595 | * |
1596 | * You must hold the module_mutex. | |
eea8b54d AN |
1597 | */ |
1598 | static int verify_export_symbols(struct module *mod) | |
1599 | { | |
b211104d | 1600 | unsigned int i; |
eea8b54d | 1601 | struct module *owner; |
b211104d RR |
1602 | const struct kernel_symbol *s; |
1603 | struct { | |
1604 | const struct kernel_symbol *sym; | |
1605 | unsigned int num; | |
1606 | } arr[] = { | |
1607 | { mod->syms, mod->num_syms }, | |
1608 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1609 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1610 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1611 | { mod->unused_syms, mod->num_unused_syms }, |
1612 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1613 | #endif |
b211104d | 1614 | }; |
eea8b54d | 1615 | |
b211104d RR |
1616 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1617 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 1618 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d RR |
1619 | printk(KERN_ERR |
1620 | "%s: exports duplicate symbol %s" | |
1621 | " (owned by %s)\n", | |
1622 | mod->name, s->name, module_name(owner)); | |
1623 | return -ENOEXEC; | |
1624 | } | |
eea8b54d | 1625 | } |
b211104d RR |
1626 | } |
1627 | return 0; | |
eea8b54d AN |
1628 | } |
1629 | ||
9a4b9708 | 1630 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4 LT |
1631 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1632 | unsigned int symindex, | |
1633 | const char *strtab, | |
1634 | unsigned int versindex, | |
1635 | unsigned int pcpuindex, | |
1636 | struct module *mod) | |
1637 | { | |
1638 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1639 | unsigned long secbase; | |
1640 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1641 | int ret = 0; | |
414fd31b | 1642 | const struct kernel_symbol *ksym; |
1da177e4 LT |
1643 | |
1644 | for (i = 1; i < n; i++) { | |
1645 | switch (sym[i].st_shndx) { | |
1646 | case SHN_COMMON: | |
1647 | /* We compiled with -fno-common. These are not | |
1648 | supposed to happen. */ | |
1649 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1650 | printk("%s: please compile with -fno-common\n", | |
1651 | mod->name); | |
1652 | ret = -ENOEXEC; | |
1653 | break; | |
1654 | ||
1655 | case SHN_ABS: | |
1656 | /* Don't need to do anything */ | |
1657 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1658 | (long)sym[i].st_value); | |
1659 | break; | |
1660 | ||
1661 | case SHN_UNDEF: | |
9bea7f23 RR |
1662 | ksym = resolve_symbol_wait(sechdrs, versindex, |
1663 | strtab + sym[i].st_name, | |
1664 | mod); | |
1da177e4 | 1665 | /* Ok if resolved. */ |
9bea7f23 | 1666 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 1667 | sym[i].st_value = ksym->value; |
1da177e4 | 1668 | break; |
414fd31b TA |
1669 | } |
1670 | ||
1da177e4 | 1671 | /* Ok if weak. */ |
9bea7f23 | 1672 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
1673 | break; |
1674 | ||
9bea7f23 RR |
1675 | printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n", |
1676 | mod->name, strtab + sym[i].st_name, | |
1677 | PTR_ERR(ksym)); | |
1678 | ret = PTR_ERR(ksym) ?: -ENOENT; | |
1da177e4 LT |
1679 | break; |
1680 | ||
1681 | default: | |
1682 | /* Divert to percpu allocation if a percpu var. */ | |
1683 | if (sym[i].st_shndx == pcpuindex) | |
259354de | 1684 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 LT |
1685 | else |
1686 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1687 | sym[i].st_value += secbase; | |
1688 | break; | |
1689 | } | |
1690 | } | |
1691 | ||
1692 | return ret; | |
1693 | } | |
1694 | ||
088af9a6 HD |
1695 | /* Additional bytes needed by arch in front of individual sections */ |
1696 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1697 | unsigned int section) | |
1698 | { | |
1699 | /* default implementation just returns zero */ | |
1700 | return 0; | |
1701 | } | |
1702 | ||
1da177e4 | 1703 | /* Update size with this section: return offset. */ |
088af9a6 HD |
1704 | static long get_offset(struct module *mod, unsigned int *size, |
1705 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
1706 | { |
1707 | long ret; | |
1708 | ||
088af9a6 | 1709 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1710 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1711 | *size = ret + sechdr->sh_size; | |
1712 | return ret; | |
1713 | } | |
1714 | ||
1715 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1716 | might -- code, read-only data, read-write data, small data. Tally | |
1717 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1718 | belongs in init. */ | |
1719 | static void layout_sections(struct module *mod, | |
1720 | const Elf_Ehdr *hdr, | |
1721 | Elf_Shdr *sechdrs, | |
1722 | const char *secstrings) | |
1723 | { | |
1724 | static unsigned long const masks[][2] = { | |
1725 | /* NOTE: all executable code must be the first section | |
1726 | * in this array; otherwise modify the text_size | |
1727 | * finder in the two loops below */ | |
1728 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1729 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1730 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1731 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1732 | }; | |
1733 | unsigned int m, i; | |
1734 | ||
1735 | for (i = 0; i < hdr->e_shnum; i++) | |
1736 | sechdrs[i].sh_entsize = ~0UL; | |
1737 | ||
1738 | DEBUGP("Core section allocation order:\n"); | |
1739 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1740 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1741 | Elf_Shdr *s = &sechdrs[i]; | |
1742 | ||
1743 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1744 | || (s->sh_flags & masks[m][1]) | |
1745 | || s->sh_entsize != ~0UL | |
49502677 | 1746 | || strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1747 | continue; |
088af9a6 | 1748 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
1da177e4 LT |
1749 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
1750 | } | |
1751 | if (m == 0) | |
1752 | mod->core_text_size = mod->core_size; | |
1753 | } | |
1754 | ||
1755 | DEBUGP("Init section allocation order:\n"); | |
1756 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1757 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1758 | Elf_Shdr *s = &sechdrs[i]; | |
1759 | ||
1760 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1761 | || (s->sh_flags & masks[m][1]) | |
1762 | || s->sh_entsize != ~0UL | |
49502677 | 1763 | || !strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1764 | continue; |
088af9a6 | 1765 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 LT |
1766 | | INIT_OFFSET_MASK); |
1767 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1768 | } | |
1769 | if (m == 0) | |
1770 | mod->init_text_size = mod->init_size; | |
1771 | } | |
1772 | } | |
1773 | ||
1da177e4 LT |
1774 | static void set_license(struct module *mod, const char *license) |
1775 | { | |
1776 | if (!license) | |
1777 | license = "unspecified"; | |
1778 | ||
fa3ba2e8 | 1779 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1780 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 1781 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1782 | "kernel.\n", mod->name, license); |
1783 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1784 | } |
1785 | } | |
1786 | ||
1787 | /* Parse tag=value strings from .modinfo section */ | |
1788 | static char *next_string(char *string, unsigned long *secsize) | |
1789 | { | |
1790 | /* Skip non-zero chars */ | |
1791 | while (string[0]) { | |
1792 | string++; | |
1793 | if ((*secsize)-- <= 1) | |
1794 | return NULL; | |
1795 | } | |
1796 | ||
1797 | /* Skip any zero padding. */ | |
1798 | while (!string[0]) { | |
1799 | string++; | |
1800 | if ((*secsize)-- <= 1) | |
1801 | return NULL; | |
1802 | } | |
1803 | return string; | |
1804 | } | |
1805 | ||
1806 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1807 | unsigned int info, | |
1808 | const char *tag) | |
1809 | { | |
1810 | char *p; | |
1811 | unsigned int taglen = strlen(tag); | |
1812 | unsigned long size = sechdrs[info].sh_size; | |
1813 | ||
1814 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1815 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1816 | return p + taglen + 1; | |
1817 | } | |
1818 | return NULL; | |
1819 | } | |
1820 | ||
c988d2b2 MD |
1821 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1822 | unsigned int infoindex) | |
1823 | { | |
1824 | struct module_attribute *attr; | |
1825 | int i; | |
1826 | ||
1827 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1828 | if (attr->setup) | |
1829 | attr->setup(mod, | |
1830 | get_modinfo(sechdrs, | |
1831 | infoindex, | |
1832 | attr->attr.name)); | |
1833 | } | |
1834 | } | |
c988d2b2 | 1835 | |
a263f776 RR |
1836 | static void free_modinfo(struct module *mod) |
1837 | { | |
1838 | struct module_attribute *attr; | |
1839 | int i; | |
1840 | ||
1841 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1842 | if (attr->free) | |
1843 | attr->free(mod); | |
1844 | } | |
1845 | } | |
1846 | ||
1da177e4 | 1847 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
1848 | |
1849 | /* lookup symbol in given range of kernel_symbols */ | |
1850 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
1851 | const struct kernel_symbol *start, | |
1852 | const struct kernel_symbol *stop) | |
1853 | { | |
1854 | const struct kernel_symbol *ks = start; | |
1855 | for (; ks < stop; ks++) | |
1856 | if (strcmp(ks->name, name) == 0) | |
1857 | return ks; | |
1858 | return NULL; | |
1859 | } | |
1860 | ||
ca4787b7 TA |
1861 | static int is_exported(const char *name, unsigned long value, |
1862 | const struct module *mod) | |
1da177e4 | 1863 | { |
ca4787b7 TA |
1864 | const struct kernel_symbol *ks; |
1865 | if (!mod) | |
1866 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 1867 | else |
ca4787b7 TA |
1868 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
1869 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
1870 | } |
1871 | ||
1872 | /* As per nm */ | |
1873 | static char elf_type(const Elf_Sym *sym, | |
1874 | Elf_Shdr *sechdrs, | |
1875 | const char *secstrings, | |
1876 | struct module *mod) | |
1877 | { | |
1878 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1879 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1880 | return 'v'; | |
1881 | else | |
1882 | return 'w'; | |
1883 | } | |
1884 | if (sym->st_shndx == SHN_UNDEF) | |
1885 | return 'U'; | |
1886 | if (sym->st_shndx == SHN_ABS) | |
1887 | return 'a'; | |
1888 | if (sym->st_shndx >= SHN_LORESERVE) | |
1889 | return '?'; | |
1890 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1891 | return 't'; | |
1892 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1893 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1894 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1895 | return 'r'; | |
1896 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1897 | return 'g'; | |
1898 | else | |
1899 | return 'd'; | |
1900 | } | |
1901 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1902 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1903 | return 's'; | |
1904 | else | |
1905 | return 'b'; | |
1906 | } | |
49502677 | 1907 | if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug")) |
1da177e4 LT |
1908 | return 'n'; |
1909 | return '?'; | |
1910 | } | |
1911 | ||
4a496226 JB |
1912 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
1913 | unsigned int shnum) | |
1914 | { | |
1915 | const Elf_Shdr *sec; | |
1916 | ||
1917 | if (src->st_shndx == SHN_UNDEF | |
1918 | || src->st_shndx >= shnum | |
1919 | || !src->st_name) | |
1920 | return false; | |
1921 | ||
1922 | sec = sechdrs + src->st_shndx; | |
1923 | if (!(sec->sh_flags & SHF_ALLOC) | |
1924 | #ifndef CONFIG_KALLSYMS_ALL | |
1925 | || !(sec->sh_flags & SHF_EXECINSTR) | |
1926 | #endif | |
1927 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
1928 | return false; | |
1929 | ||
1930 | return true; | |
1931 | } | |
1932 | ||
1933 | static unsigned long layout_symtab(struct module *mod, | |
1934 | Elf_Shdr *sechdrs, | |
1935 | unsigned int symindex, | |
554bdfe5 | 1936 | unsigned int strindex, |
4a496226 | 1937 | const Elf_Ehdr *hdr, |
554bdfe5 JB |
1938 | const char *secstrings, |
1939 | unsigned long *pstroffs, | |
1940 | unsigned long *strmap) | |
4a496226 JB |
1941 | { |
1942 | unsigned long symoffs; | |
1943 | Elf_Shdr *symsect = sechdrs + symindex; | |
554bdfe5 | 1944 | Elf_Shdr *strsect = sechdrs + strindex; |
4a496226 | 1945 | const Elf_Sym *src; |
554bdfe5 | 1946 | const char *strtab; |
4a496226 JB |
1947 | unsigned int i, nsrc, ndst; |
1948 | ||
1949 | /* Put symbol section at end of init part of module. */ | |
1950 | symsect->sh_flags |= SHF_ALLOC; | |
1951 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
1952 | symindex) | INIT_OFFSET_MASK; | |
1953 | DEBUGP("\t%s\n", secstrings + symsect->sh_name); | |
1954 | ||
1955 | src = (void *)hdr + symsect->sh_offset; | |
1956 | nsrc = symsect->sh_size / sizeof(*src); | |
554bdfe5 | 1957 | strtab = (void *)hdr + strsect->sh_offset; |
4a496226 | 1958 | for (ndst = i = 1; i < nsrc; ++i, ++src) |
554bdfe5 JB |
1959 | if (is_core_symbol(src, sechdrs, hdr->e_shnum)) { |
1960 | unsigned int j = src->st_name; | |
1961 | ||
1962 | while(!__test_and_set_bit(j, strmap) && strtab[j]) | |
1963 | ++j; | |
4a496226 | 1964 | ++ndst; |
554bdfe5 | 1965 | } |
4a496226 JB |
1966 | |
1967 | /* Append room for core symbols at end of core part. */ | |
1968 | symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); | |
1969 | mod->core_size = symoffs + ndst * sizeof(Elf_Sym); | |
1970 | ||
554bdfe5 JB |
1971 | /* Put string table section at end of init part of module. */ |
1972 | strsect->sh_flags |= SHF_ALLOC; | |
1973 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
1974 | strindex) | INIT_OFFSET_MASK; | |
1975 | DEBUGP("\t%s\n", secstrings + strsect->sh_name); | |
1976 | ||
1977 | /* Append room for core symbols' strings at end of core part. */ | |
1978 | *pstroffs = mod->core_size; | |
1979 | __set_bit(0, strmap); | |
1980 | mod->core_size += bitmap_weight(strmap, strsect->sh_size); | |
1981 | ||
4a496226 JB |
1982 | return symoffs; |
1983 | } | |
1984 | ||
1da177e4 LT |
1985 | static void add_kallsyms(struct module *mod, |
1986 | Elf_Shdr *sechdrs, | |
4a496226 | 1987 | unsigned int shnum, |
1da177e4 LT |
1988 | unsigned int symindex, |
1989 | unsigned int strindex, | |
4a496226 | 1990 | unsigned long symoffs, |
554bdfe5 JB |
1991 | unsigned long stroffs, |
1992 | const char *secstrings, | |
1993 | unsigned long *strmap) | |
1da177e4 | 1994 | { |
4a496226 JB |
1995 | unsigned int i, ndst; |
1996 | const Elf_Sym *src; | |
1997 | Elf_Sym *dst; | |
554bdfe5 | 1998 | char *s; |
1da177e4 LT |
1999 | |
2000 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
2001 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
2002 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
2003 | ||
2004 | /* Set types up while we still have access to sections. */ | |
2005 | for (i = 0; i < mod->num_symtab; i++) | |
2006 | mod->symtab[i].st_info | |
2007 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
4a496226 JB |
2008 | |
2009 | mod->core_symtab = dst = mod->module_core + symoffs; | |
2010 | src = mod->symtab; | |
2011 | *dst = *src; | |
2012 | for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { | |
2013 | if (!is_core_symbol(src, sechdrs, shnum)) | |
2014 | continue; | |
2015 | dst[ndst] = *src; | |
554bdfe5 | 2016 | dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name); |
4a496226 JB |
2017 | ++ndst; |
2018 | } | |
2019 | mod->core_num_syms = ndst; | |
554bdfe5 JB |
2020 | |
2021 | mod->core_strtab = s = mod->module_core + stroffs; | |
2022 | for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i) | |
2023 | if (test_bit(i, strmap)) | |
2024 | *++s = mod->strtab[i]; | |
1da177e4 LT |
2025 | } |
2026 | #else | |
4a496226 JB |
2027 | static inline unsigned long layout_symtab(struct module *mod, |
2028 | Elf_Shdr *sechdrs, | |
2029 | unsigned int symindex, | |
554bdfe5 | 2030 | unsigned int strindex, |
3ae91c21 | 2031 | const Elf_Ehdr *hdr, |
554bdfe5 JB |
2032 | const char *secstrings, |
2033 | unsigned long *pstroffs, | |
2034 | unsigned long *strmap) | |
4a496226 | 2035 | { |
3ae91c21 | 2036 | return 0; |
4a496226 | 2037 | } |
3ae91c21 | 2038 | |
1da177e4 LT |
2039 | static inline void add_kallsyms(struct module *mod, |
2040 | Elf_Shdr *sechdrs, | |
4a496226 | 2041 | unsigned int shnum, |
1da177e4 LT |
2042 | unsigned int symindex, |
2043 | unsigned int strindex, | |
4a496226 | 2044 | unsigned long symoffs, |
554bdfe5 JB |
2045 | unsigned long stroffs, |
2046 | const char *secstrings, | |
2047 | const unsigned long *strmap) | |
1da177e4 LT |
2048 | { |
2049 | } | |
2050 | #endif /* CONFIG_KALLSYMS */ | |
2051 | ||
e9d376f0 | 2052 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2053 | { |
e9d376f0 JB |
2054 | #ifdef CONFIG_DYNAMIC_DEBUG |
2055 | if (ddebug_add_module(debug, num, debug->modname)) | |
2056 | printk(KERN_ERR "dynamic debug error adding module: %s\n", | |
2057 | debug->modname); | |
2058 | #endif | |
5e458cc0 | 2059 | } |
346e15be | 2060 | |
ff49d74a YS |
2061 | static void dynamic_debug_remove(struct _ddebug *debug) |
2062 | { | |
2063 | if (debug) | |
2064 | ddebug_remove_module(debug->modname); | |
2065 | } | |
2066 | ||
3a642e99 RR |
2067 | static void *module_alloc_update_bounds(unsigned long size) |
2068 | { | |
2069 | void *ret = module_alloc(size); | |
2070 | ||
2071 | if (ret) { | |
75676500 | 2072 | mutex_lock(&module_mutex); |
3a642e99 RR |
2073 | /* Update module bounds. */ |
2074 | if ((unsigned long)ret < module_addr_min) | |
2075 | module_addr_min = (unsigned long)ret; | |
2076 | if ((unsigned long)ret + size > module_addr_max) | |
2077 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2078 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2079 | } |
2080 | return ret; | |
2081 | } | |
2082 | ||
4f2294b6 CM |
2083 | #ifdef CONFIG_DEBUG_KMEMLEAK |
2084 | static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
65b8a9b4 LT |
2085 | const Elf_Shdr *sechdrs, |
2086 | const char *secstrings) | |
4f2294b6 CM |
2087 | { |
2088 | unsigned int i; | |
2089 | ||
2090 | /* only scan the sections containing data */ | |
c017b4be | 2091 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 CM |
2092 | |
2093 | for (i = 1; i < hdr->e_shnum; i++) { | |
2094 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2095 | continue; | |
2096 | if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0 | |
2097 | && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0) | |
2098 | continue; | |
2099 | ||
c017b4be | 2100 | kmemleak_scan_area((void *)sechdrs[i].sh_addr, |
4f2294b6 CM |
2101 | sechdrs[i].sh_size, GFP_KERNEL); |
2102 | } | |
2103 | } | |
2104 | #else | |
2105 | static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
65b8a9b4 LT |
2106 | Elf_Shdr *sechdrs, |
2107 | const char *secstrings) | |
4f2294b6 CM |
2108 | { |
2109 | } | |
2110 | #endif | |
2111 | ||
f91a13bb LT |
2112 | static void find_module_sections(struct module *mod, Elf_Ehdr *hdr, |
2113 | Elf_Shdr *sechdrs, const char *secstrings) | |
2114 | { | |
2115 | mod->kp = section_objs(hdr, sechdrs, secstrings, "__param", | |
2116 | sizeof(*mod->kp), &mod->num_kp); | |
2117 | mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab", | |
2118 | sizeof(*mod->syms), &mod->num_syms); | |
2119 | mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab"); | |
2120 | mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl", | |
2121 | sizeof(*mod->gpl_syms), | |
2122 | &mod->num_gpl_syms); | |
2123 | mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
2124 | mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings, | |
2125 | "__ksymtab_gpl_future", | |
2126 | sizeof(*mod->gpl_future_syms), | |
2127 | &mod->num_gpl_future_syms); | |
2128 | mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings, | |
2129 | "__kcrctab_gpl_future"); | |
2130 | ||
2131 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2132 | mod->unused_syms = section_objs(hdr, sechdrs, secstrings, | |
2133 | "__ksymtab_unused", | |
2134 | sizeof(*mod->unused_syms), | |
2135 | &mod->num_unused_syms); | |
2136 | mod->unused_crcs = section_addr(hdr, sechdrs, secstrings, | |
2137 | "__kcrctab_unused"); | |
2138 | mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings, | |
2139 | "__ksymtab_unused_gpl", | |
2140 | sizeof(*mod->unused_gpl_syms), | |
2141 | &mod->num_unused_gpl_syms); | |
2142 | mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings, | |
2143 | "__kcrctab_unused_gpl"); | |
2144 | #endif | |
2145 | #ifdef CONFIG_CONSTRUCTORS | |
2146 | mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors", | |
2147 | sizeof(*mod->ctors), &mod->num_ctors); | |
2148 | #endif | |
2149 | ||
2150 | #ifdef CONFIG_TRACEPOINTS | |
2151 | mod->tracepoints = section_objs(hdr, sechdrs, secstrings, | |
2152 | "__tracepoints", | |
2153 | sizeof(*mod->tracepoints), | |
2154 | &mod->num_tracepoints); | |
2155 | #endif | |
2156 | #ifdef CONFIG_EVENT_TRACING | |
2157 | mod->trace_events = section_objs(hdr, sechdrs, secstrings, | |
2158 | "_ftrace_events", | |
2159 | sizeof(*mod->trace_events), | |
2160 | &mod->num_trace_events); | |
2161 | /* | |
2162 | * This section contains pointers to allocated objects in the trace | |
2163 | * code and not scanning it leads to false positives. | |
2164 | */ | |
2165 | kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) * | |
2166 | mod->num_trace_events, GFP_KERNEL); | |
2167 | #endif | |
2168 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
2169 | /* sechdrs[0].sh_size is always zero */ | |
2170 | mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings, | |
2171 | "__mcount_loc", | |
2172 | sizeof(*mod->ftrace_callsites), | |
2173 | &mod->num_ftrace_callsites); | |
2174 | #endif | |
2175 | } | |
2176 | ||
65b8a9b4 LT |
2177 | static struct module *move_module(struct module *mod, |
2178 | Elf_Ehdr *hdr, Elf_Shdr *sechdrs, | |
2179 | const char *secstrings, unsigned modindex) | |
2180 | { | |
2181 | int i; | |
2182 | void *ptr; | |
2183 | ||
2184 | /* Do the allocs. */ | |
2185 | ptr = module_alloc_update_bounds(mod->core_size); | |
2186 | /* | |
2187 | * The pointer to this block is stored in the module structure | |
2188 | * which is inside the block. Just mark it as not being a | |
2189 | * leak. | |
2190 | */ | |
2191 | kmemleak_not_leak(ptr); | |
2192 | if (!ptr) | |
2193 | return ERR_PTR(-ENOMEM); | |
2194 | ||
2195 | memset(ptr, 0, mod->core_size); | |
2196 | mod->module_core = ptr; | |
2197 | ||
2198 | ptr = module_alloc_update_bounds(mod->init_size); | |
2199 | /* | |
2200 | * The pointer to this block is stored in the module structure | |
2201 | * which is inside the block. This block doesn't need to be | |
2202 | * scanned as it contains data and code that will be freed | |
2203 | * after the module is initialized. | |
2204 | */ | |
2205 | kmemleak_ignore(ptr); | |
2206 | if (!ptr && mod->init_size) { | |
2207 | module_free(mod, mod->module_core); | |
2208 | return ERR_PTR(-ENOMEM); | |
2209 | } | |
2210 | memset(ptr, 0, mod->init_size); | |
2211 | mod->module_init = ptr; | |
2212 | ||
2213 | /* Transfer each section which specifies SHF_ALLOC */ | |
2214 | DEBUGP("final section addresses:\n"); | |
2215 | for (i = 0; i < hdr->e_shnum; i++) { | |
2216 | void *dest; | |
2217 | ||
2218 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2219 | continue; | |
2220 | ||
2221 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
2222 | dest = mod->module_init | |
2223 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
2224 | else | |
2225 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
2226 | ||
2227 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
2228 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
2229 | sechdrs[i].sh_size); | |
2230 | /* Update sh_addr to point to copy in image. */ | |
2231 | sechdrs[i].sh_addr = (unsigned long)dest; | |
2232 | DEBUGP("\t0x%lx %s\n", | |
2233 | sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
2234 | } | |
2235 | /* Module has been moved. */ | |
2236 | mod = (void *)sechdrs[modindex].sh_addr; | |
2237 | kmemleak_load_module(mod, hdr, sechdrs, secstrings); | |
2238 | return mod; | |
2239 | } | |
2240 | ||
1da177e4 LT |
2241 | /* Allocate and load the module: note that size of section 0 is always |
2242 | zero, and we rely on this for optional sections. */ | |
ffb4ba76 | 2243 | static noinline struct module *load_module(void __user *umod, |
1da177e4 LT |
2244 | unsigned long len, |
2245 | const char __user *uargs) | |
2246 | { | |
2247 | Elf_Ehdr *hdr; | |
2248 | Elf_Shdr *sechdrs; | |
2249 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
061b1bd3 | 2250 | char *staging; |
84860f99 AM |
2251 | unsigned int i; |
2252 | unsigned int symindex = 0; | |
2253 | unsigned int strindex = 0; | |
5e458cc0 | 2254 | unsigned int modindex, versindex, infoindex, pcpuindex; |
1da177e4 LT |
2255 | struct module *mod; |
2256 | long err = 0; | |
554bdfe5 | 2257 | unsigned long symoffs, stroffs, *strmap; |
293a7cfe | 2258 | void __percpu *percpu; |
ff49d74a YS |
2259 | struct _ddebug *debug = NULL; |
2260 | unsigned int num_debug = 0; | |
3ae91c21 | 2261 | |
378bac82 | 2262 | mm_segment_t old_fs; |
1da177e4 LT |
2263 | |
2264 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
2265 | umod, len, uargs); | |
2266 | if (len < sizeof(*hdr)) | |
2267 | return ERR_PTR(-ENOEXEC); | |
2268 | ||
2269 | /* Suck in entire file: we'll want most of it. */ | |
2270 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
2271 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
2272 | return ERR_PTR(-ENOMEM); | |
9e01892c | 2273 | |
1da177e4 LT |
2274 | if (copy_from_user(hdr, umod, len) != 0) { |
2275 | err = -EFAULT; | |
2276 | goto free_hdr; | |
2277 | } | |
2278 | ||
2279 | /* Sanity checks against insmoding binaries or wrong arch, | |
f91a13bb | 2280 | weird elf version */ |
c4ea6fcf | 2281 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
1da177e4 LT |
2282 | || hdr->e_type != ET_REL |
2283 | || !elf_check_arch(hdr) | |
2284 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
2285 | err = -ENOEXEC; | |
2286 | goto free_hdr; | |
2287 | } | |
2288 | ||
2289 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
2290 | goto truncated; | |
2291 | ||
2292 | /* Convenience variables */ | |
2293 | sechdrs = (void *)hdr + hdr->e_shoff; | |
2294 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
2295 | sechdrs[0].sh_addr = 0; | |
2296 | ||
2297 | for (i = 1; i < hdr->e_shnum; i++) { | |
2298 | if (sechdrs[i].sh_type != SHT_NOBITS | |
2299 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
2300 | goto truncated; | |
2301 | ||
2302 | /* Mark all sections sh_addr with their address in the | |
2303 | temporary image. */ | |
2304 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
2305 | ||
2306 | /* Internal symbols and strings. */ | |
2307 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
2308 | symindex = i; | |
2309 | strindex = sechdrs[i].sh_link; | |
2310 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
2311 | } | |
2312 | #ifndef CONFIG_MODULE_UNLOAD | |
2313 | /* Don't load .exit sections */ | |
49502677 | 2314 | if (strstarts(secstrings+sechdrs[i].sh_name, ".exit")) |
1da177e4 LT |
2315 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2316 | #endif | |
2317 | } | |
2318 | ||
2319 | modindex = find_sec(hdr, sechdrs, secstrings, | |
2320 | ".gnu.linkonce.this_module"); | |
2321 | if (!modindex) { | |
2322 | printk(KERN_WARNING "No module found in object\n"); | |
2323 | err = -ENOEXEC; | |
2324 | goto free_hdr; | |
2325 | } | |
5e458cc0 | 2326 | /* This is temporary: point mod into copy of data. */ |
1da177e4 LT |
2327 | mod = (void *)sechdrs[modindex].sh_addr; |
2328 | ||
2329 | if (symindex == 0) { | |
2330 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
2331 | mod->name); | |
2332 | err = -ENOEXEC; | |
2333 | goto free_hdr; | |
2334 | } | |
2335 | ||
1da177e4 LT |
2336 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); |
2337 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
2338 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
2339 | ||
ea01e798 | 2340 | /* Don't keep modinfo and version sections. */ |
1da177e4 | 2341 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
ea01e798 | 2342 | sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
2343 | |
2344 | /* Check module struct version now, before we try to use module. */ | |
2345 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
2346 | err = -ENOEXEC; | |
2347 | goto free_hdr; | |
2348 | } | |
2349 | ||
2350 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
2351 | /* This is allowed: modprobe --force will invalidate it. */ | |
2352 | if (!modmagic) { | |
c6e665c8 | 2353 | err = try_to_force_load(mod, "bad vermagic"); |
826e4506 LT |
2354 | if (err) |
2355 | goto free_hdr; | |
91e37a79 | 2356 | } else if (!same_magic(modmagic, vermagic, versindex)) { |
1da177e4 LT |
2357 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
2358 | mod->name, modmagic, vermagic); | |
2359 | err = -ENOEXEC; | |
2360 | goto free_hdr; | |
2361 | } | |
2362 | ||
061b1bd3 GKH |
2363 | staging = get_modinfo(sechdrs, infoindex, "staging"); |
2364 | if (staging) { | |
2365 | add_taint_module(mod, TAINT_CRAP); | |
2366 | printk(KERN_WARNING "%s: module is from the staging directory," | |
2367 | " the quality is unknown, you have been warned.\n", | |
2368 | mod->name); | |
2369 | } | |
2370 | ||
1da177e4 | 2371 | /* Now copy in args */ |
24277dda DA |
2372 | args = strndup_user(uargs, ~0UL >> 1); |
2373 | if (IS_ERR(args)) { | |
2374 | err = PTR_ERR(args); | |
1da177e4 LT |
2375 | goto free_hdr; |
2376 | } | |
8e08b756 | 2377 | |
554bdfe5 JB |
2378 | strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size) |
2379 | * sizeof(long), GFP_KERNEL); | |
2380 | if (!strmap) { | |
2381 | err = -ENOMEM; | |
2382 | goto free_mod; | |
2383 | } | |
2384 | ||
1da177e4 LT |
2385 | mod->state = MODULE_STATE_COMING; |
2386 | ||
2387 | /* Allow arches to frob section contents and sizes. */ | |
2388 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
2389 | if (err < 0) | |
2390 | goto free_mod; | |
2391 | ||
2392 | if (pcpuindex) { | |
2393 | /* We have a special allocation for this section. */ | |
259354de TH |
2394 | err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size, |
2395 | sechdrs[pcpuindex].sh_addralign); | |
2396 | if (err) | |
6e2b7574 | 2397 | goto free_mod; |
1da177e4 | 2398 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 | 2399 | } |
293a7cfe RR |
2400 | /* Keep this around for failure path. */ |
2401 | percpu = mod_percpu(mod); | |
1da177e4 LT |
2402 | |
2403 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2404 | this is done generically; there doesn't appear to be any | |
2405 | special cases for the architectures. */ | |
2406 | layout_sections(mod, hdr, sechdrs, secstrings); | |
554bdfe5 JB |
2407 | symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr, |
2408 | secstrings, &stroffs, strmap); | |
1da177e4 | 2409 | |
65b8a9b4 LT |
2410 | /* Allocate and move to the final place */ |
2411 | mod = move_module(mod, hdr, sechdrs, secstrings, modindex); | |
2412 | if (IS_ERR(mod)) { | |
2413 | err = PTR_ERR(mod); | |
1da177e4 LT |
2414 | goto free_percpu; |
2415 | } | |
1da177e4 | 2416 | |
e1783a24 CL |
2417 | #if defined(CONFIG_MODULE_UNLOAD) |
2418 | mod->refptr = alloc_percpu(struct module_ref); | |
6e2b7574 MH |
2419 | if (!mod->refptr) { |
2420 | err = -ENOMEM; | |
2421 | goto free_init; | |
2422 | } | |
2423 | #endif | |
1da177e4 LT |
2424 | /* Now we've moved module, initialize linked lists, etc. */ |
2425 | module_unload_init(mod); | |
2426 | ||
2427 | /* Set up license info based on the info section */ | |
2428 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
2429 | ||
9b37ccfc PR |
2430 | /* |
2431 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2432 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2433 | * using GPL-only symbols it needs. | |
2434 | */ | |
fa3ba2e8 | 2435 | if (strcmp(mod->name, "ndiswrapper") == 0) |
9b37ccfc PR |
2436 | add_taint(TAINT_PROPRIETARY_MODULE); |
2437 | ||
2438 | /* driverloader was caught wrongly pretending to be under GPL */ | |
fa3ba2e8 FM |
2439 | if (strcmp(mod->name, "driverloader") == 0) |
2440 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
9841d61d | 2441 | |
c988d2b2 MD |
2442 | /* Set up MODINFO_ATTR fields */ |
2443 | setup_modinfo(mod, sechdrs, infoindex); | |
c988d2b2 | 2444 | |
1da177e4 LT |
2445 | /* Fix up syms, so that st_value is a pointer to location. */ |
2446 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
2447 | mod); | |
2448 | if (err < 0) | |
2449 | goto cleanup; | |
2450 | ||
5e458cc0 RR |
2451 | /* Now we've got everything in the final locations, we can |
2452 | * find optional sections. */ | |
f91a13bb | 2453 | find_module_sections(mod, hdr, sechdrs, secstrings); |
1da177e4 LT |
2454 | |
2455 | #ifdef CONFIG_MODVERSIONS | |
5e458cc0 RR |
2456 | if ((mod->num_syms && !mod->crcs) |
2457 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2458 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
f7f5b675 | 2459 | #ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0 RR |
2460 | || (mod->num_unused_syms && !mod->unused_crcs) |
2461 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
f7f5b675 DV |
2462 | #endif |
2463 | ) { | |
c6e665c8 RR |
2464 | err = try_to_force_load(mod, |
2465 | "no versions for exported symbols"); | |
826e4506 LT |
2466 | if (err) |
2467 | goto cleanup; | |
1da177e4 LT |
2468 | } |
2469 | #endif | |
2470 | ||
2471 | /* Now do relocations. */ | |
2472 | for (i = 1; i < hdr->e_shnum; i++) { | |
2473 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
2474 | unsigned int info = sechdrs[i].sh_info; | |
2475 | ||
2476 | /* Not a valid relocation section? */ | |
2477 | if (info >= hdr->e_shnum) | |
2478 | continue; | |
2479 | ||
2480 | /* Don't bother with non-allocated sections */ | |
2481 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
2482 | continue; | |
2483 | ||
2484 | if (sechdrs[i].sh_type == SHT_REL) | |
2485 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
2486 | else if (sechdrs[i].sh_type == SHT_RELA) | |
2487 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
2488 | mod); | |
2489 | if (err < 0) | |
2490 | goto cleanup; | |
2491 | } | |
2492 | ||
2493 | /* Set up and sort exception table */ | |
5e458cc0 RR |
2494 | mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table", |
2495 | sizeof(*mod->extable), &mod->num_exentries); | |
2496 | sort_extable(mod->extable, mod->extable + mod->num_exentries); | |
1da177e4 LT |
2497 | |
2498 | /* Finally, copy percpu area over. */ | |
259354de | 2499 | percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr, |
1da177e4 LT |
2500 | sechdrs[pcpuindex].sh_size); |
2501 | ||
4a496226 | 2502 | add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex, |
554bdfe5 JB |
2503 | symoffs, stroffs, secstrings, strmap); |
2504 | kfree(strmap); | |
2505 | strmap = NULL; | |
1da177e4 | 2506 | |
ff49d74a | 2507 | if (!mod->taints) |
5e458cc0 RR |
2508 | debug = section_objs(hdr, sechdrs, secstrings, "__verbose", |
2509 | sizeof(*debug), &num_debug); | |
90d595fe | 2510 | |
1da177e4 LT |
2511 | err = module_finalize(hdr, sechdrs, mod); |
2512 | if (err < 0) | |
2513 | goto cleanup; | |
2514 | ||
378bac82 TK |
2515 | /* flush the icache in correct context */ |
2516 | old_fs = get_fs(); | |
2517 | set_fs(KERNEL_DS); | |
2518 | ||
2519 | /* | |
2520 | * Flush the instruction cache, since we've played with text. | |
2521 | * Do it before processing of module parameters, so the module | |
2522 | * can provide parameter accessor functions of its own. | |
2523 | */ | |
2524 | if (mod->module_init) | |
2525 | flush_icache_range((unsigned long)mod->module_init, | |
2526 | (unsigned long)mod->module_init | |
2527 | + mod->init_size); | |
2528 | flush_icache_range((unsigned long)mod->module_core, | |
2529 | (unsigned long)mod->module_core + mod->core_size); | |
2530 | ||
2531 | set_fs(old_fs); | |
2532 | ||
1da177e4 | 2533 | mod->args = args; |
5e458cc0 | 2534 | if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) |
8d3b33f6 RR |
2535 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2536 | mod->name); | |
2537 | ||
bb9d3d56 | 2538 | /* Now sew it into the lists so we can get lockdep and oops |
d72b3751 AK |
2539 | * info during argument parsing. Noone should access us, since |
2540 | * strong_try_module_get() will fail. | |
2541 | * lockdep/oops can run asynchronous, so use the RCU list insertion | |
2542 | * function to insert in a way safe to concurrent readers. | |
2543 | * The mutex protects against concurrent writers. | |
2544 | */ | |
75676500 | 2545 | mutex_lock(&module_mutex); |
3bafeb62 LT |
2546 | if (find_module(mod->name)) { |
2547 | err = -EEXIST; | |
be593f4c | 2548 | goto unlock; |
3bafeb62 LT |
2549 | } |
2550 | ||
ff49d74a YS |
2551 | if (debug) |
2552 | dynamic_debug_setup(debug, num_debug); | |
2553 | ||
be593f4c RR |
2554 | /* Find duplicate symbols */ |
2555 | err = verify_export_symbols(mod); | |
2556 | if (err < 0) | |
ff49d74a | 2557 | goto ddebug; |
be593f4c | 2558 | |
d72b3751 | 2559 | list_add_rcu(&mod->list, &modules); |
75676500 | 2560 | mutex_unlock(&module_mutex); |
bb9d3d56 | 2561 | |
e180a6b7 | 2562 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
1da177e4 | 2563 | if (err < 0) |
bb9d3d56 | 2564 | goto unlink; |
1da177e4 | 2565 | |
e180a6b7 | 2566 | err = mod_sysfs_setup(mod, mod->kp, mod->num_kp); |
1da177e4 | 2567 | if (err < 0) |
bb9d3d56 | 2568 | goto unlink; |
80a3d1bb | 2569 | |
1da177e4 | 2570 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
6d760133 | 2571 | add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
1da177e4 LT |
2572 | |
2573 | /* Get rid of temporary copy */ | |
2574 | vfree(hdr); | |
2575 | ||
7ead8b83 LZ |
2576 | trace_module_load(mod); |
2577 | ||
1da177e4 LT |
2578 | /* Done! */ |
2579 | return mod; | |
2580 | ||
bb9d3d56 | 2581 | unlink: |
75676500 | 2582 | mutex_lock(&module_mutex); |
e91defa2 RR |
2583 | /* Unlink carefully: kallsyms could be walking list. */ |
2584 | list_del_rcu(&mod->list); | |
ff49d74a YS |
2585 | ddebug: |
2586 | dynamic_debug_remove(debug); | |
be593f4c | 2587 | unlock: |
75676500 | 2588 | mutex_unlock(&module_mutex); |
e91defa2 | 2589 | synchronize_sched(); |
1da177e4 LT |
2590 | module_arch_cleanup(mod); |
2591 | cleanup: | |
a263f776 | 2592 | free_modinfo(mod); |
1da177e4 | 2593 | module_unload_free(mod); |
e1783a24 CL |
2594 | #if defined(CONFIG_MODULE_UNLOAD) |
2595 | free_percpu(mod->refptr); | |
ffa9f12a | 2596 | free_init: |
6e2b7574 | 2597 | #endif |
1da177e4 | 2598 | module_free(mod, mod->module_init); |
1da177e4 | 2599 | module_free(mod, mod->module_core); |
6e2b7574 | 2600 | /* mod will be freed with core. Don't access it beyond this line! */ |
1da177e4 | 2601 | free_percpu: |
293a7cfe | 2602 | free_percpu(percpu); |
1da177e4 LT |
2603 | free_mod: |
2604 | kfree(args); | |
554bdfe5 | 2605 | kfree(strmap); |
1da177e4 LT |
2606 | free_hdr: |
2607 | vfree(hdr); | |
6fe2e70b | 2608 | return ERR_PTR(err); |
1da177e4 LT |
2609 | |
2610 | truncated: | |
2611 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
2612 | err = -ENOEXEC; | |
2613 | goto free_hdr; | |
2614 | } | |
2615 | ||
b99b87f7 PO |
2616 | /* Call module constructors. */ |
2617 | static void do_mod_ctors(struct module *mod) | |
2618 | { | |
2619 | #ifdef CONFIG_CONSTRUCTORS | |
2620 | unsigned long i; | |
2621 | ||
2622 | for (i = 0; i < mod->num_ctors; i++) | |
2623 | mod->ctors[i](); | |
2624 | #endif | |
2625 | } | |
2626 | ||
1da177e4 | 2627 | /* This is where the real work happens */ |
17da2bd9 HC |
2628 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2629 | unsigned long, len, const char __user *, uargs) | |
1da177e4 LT |
2630 | { |
2631 | struct module *mod; | |
2632 | int ret = 0; | |
2633 | ||
2634 | /* Must have permission */ | |
3d43321b | 2635 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
1da177e4 LT |
2636 | return -EPERM; |
2637 | ||
1da177e4 LT |
2638 | /* Do all the hard work */ |
2639 | mod = load_module(umod, len, uargs); | |
75676500 | 2640 | if (IS_ERR(mod)) |
1da177e4 | 2641 | return PTR_ERR(mod); |
1da177e4 | 2642 | |
e041c683 AS |
2643 | blocking_notifier_call_chain(&module_notify_list, |
2644 | MODULE_STATE_COMING, mod); | |
1da177e4 | 2645 | |
b99b87f7 | 2646 | do_mod_ctors(mod); |
1da177e4 LT |
2647 | /* Start the module */ |
2648 | if (mod->init != NULL) | |
59f9415f | 2649 | ret = do_one_initcall(mod->init); |
1da177e4 LT |
2650 | if (ret < 0) { |
2651 | /* Init routine failed: abort. Try to protect us from | |
2652 | buggy refcounters. */ | |
2653 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2654 | synchronize_sched(); |
af49d924 | 2655 | module_put(mod); |
df4b565e PO |
2656 | blocking_notifier_call_chain(&module_notify_list, |
2657 | MODULE_STATE_GOING, mod); | |
af49d924 | 2658 | free_module(mod); |
c9a3ba55 | 2659 | wake_up(&module_wq); |
1da177e4 LT |
2660 | return ret; |
2661 | } | |
e24e2e64 | 2662 | if (ret > 0) { |
ad361c98 JP |
2663 | printk(KERN_WARNING |
2664 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" | |
2665 | "%s: loading module anyway...\n", | |
e24e2e64 AD |
2666 | __func__, mod->name, ret, |
2667 | __func__); | |
2668 | dump_stack(); | |
2669 | } | |
1da177e4 | 2670 | |
6c5db22d | 2671 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 2672 | mod->state = MODULE_STATE_LIVE; |
6c5db22d | 2673 | wake_up(&module_wq); |
0deddf43 MH |
2674 | blocking_notifier_call_chain(&module_notify_list, |
2675 | MODULE_STATE_LIVE, mod); | |
6c5db22d | 2676 | |
d6de2c80 LT |
2677 | /* We need to finish all async code before the module init sequence is done */ |
2678 | async_synchronize_full(); | |
2679 | ||
6c5db22d | 2680 | mutex_lock(&module_mutex); |
1da177e4 LT |
2681 | /* Drop initial reference. */ |
2682 | module_put(mod); | |
ad6561df | 2683 | trim_init_extable(mod); |
4a496226 JB |
2684 | #ifdef CONFIG_KALLSYMS |
2685 | mod->num_symtab = mod->core_num_syms; | |
2686 | mod->symtab = mod->core_symtab; | |
554bdfe5 | 2687 | mod->strtab = mod->core_strtab; |
4a496226 | 2688 | #endif |
1da177e4 LT |
2689 | module_free(mod, mod->module_init); |
2690 | mod->module_init = NULL; | |
2691 | mod->init_size = 0; | |
2692 | mod->init_text_size = 0; | |
6389a385 | 2693 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2694 | |
2695 | return 0; | |
2696 | } | |
2697 | ||
2698 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2699 | { | |
2700 | return ((void *)addr >= start && (void *)addr < start + size); | |
2701 | } | |
2702 | ||
2703 | #ifdef CONFIG_KALLSYMS | |
2704 | /* | |
2705 | * This ignores the intensely annoying "mapping symbols" found | |
2706 | * in ARM ELF files: $a, $t and $d. | |
2707 | */ | |
2708 | static inline int is_arm_mapping_symbol(const char *str) | |
2709 | { | |
22a8bdeb | 2710 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2711 | && (str[2] == '\0' || str[2] == '.'); |
2712 | } | |
2713 | ||
2714 | static const char *get_ksymbol(struct module *mod, | |
2715 | unsigned long addr, | |
2716 | unsigned long *size, | |
2717 | unsigned long *offset) | |
2718 | { | |
2719 | unsigned int i, best = 0; | |
2720 | unsigned long nextval; | |
2721 | ||
2722 | /* At worse, next value is at end of module */ | |
a06f6211 | 2723 | if (within_module_init(addr, mod)) |
1da177e4 | 2724 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 2725 | else |
1da177e4 LT |
2726 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2727 | ||
2728 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
22a8bdeb | 2729 | starts real symbols at 1). */ |
1da177e4 LT |
2730 | for (i = 1; i < mod->num_symtab; i++) { |
2731 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2732 | continue; | |
2733 | ||
2734 | /* We ignore unnamed symbols: they're uninformative | |
2735 | * and inserted at a whim. */ | |
2736 | if (mod->symtab[i].st_value <= addr | |
2737 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2738 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2739 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2740 | best = i; | |
2741 | if (mod->symtab[i].st_value > addr | |
2742 | && mod->symtab[i].st_value < nextval | |
2743 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2744 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2745 | nextval = mod->symtab[i].st_value; | |
2746 | } | |
2747 | ||
2748 | if (!best) | |
2749 | return NULL; | |
2750 | ||
ffb45122 AD |
2751 | if (size) |
2752 | *size = nextval - mod->symtab[best].st_value; | |
2753 | if (offset) | |
2754 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2755 | return mod->strtab + mod->symtab[best].st_name; |
2756 | } | |
2757 | ||
6dd06c9f RR |
2758 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2759 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 2760 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
2761 | unsigned long *size, |
2762 | unsigned long *offset, | |
2763 | char **modname, | |
2764 | char *namebuf) | |
1da177e4 LT |
2765 | { |
2766 | struct module *mod; | |
cb2a5205 | 2767 | const char *ret = NULL; |
1da177e4 | 2768 | |
cb2a5205 | 2769 | preempt_disable(); |
d72b3751 | 2770 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2771 | if (within_module_init(addr, mod) || |
2772 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
2773 | if (modname) |
2774 | *modname = mod->name; | |
cb2a5205 RR |
2775 | ret = get_ksymbol(mod, addr, size, offset); |
2776 | break; | |
1da177e4 LT |
2777 | } |
2778 | } | |
6dd06c9f RR |
2779 | /* Make a copy in here where it's safe */ |
2780 | if (ret) { | |
2781 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
2782 | ret = namebuf; | |
2783 | } | |
cb2a5205 | 2784 | preempt_enable(); |
92dfc9dc | 2785 | return ret; |
1da177e4 LT |
2786 | } |
2787 | ||
9d65cb4a AD |
2788 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2789 | { | |
2790 | struct module *mod; | |
2791 | ||
cb2a5205 | 2792 | preempt_disable(); |
d72b3751 | 2793 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2794 | if (within_module_init(addr, mod) || |
2795 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
2796 | const char *sym; |
2797 | ||
2798 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2799 | if (!sym) | |
2800 | goto out; | |
9281acea | 2801 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 2802 | preempt_enable(); |
9d65cb4a AD |
2803 | return 0; |
2804 | } | |
2805 | } | |
2806 | out: | |
cb2a5205 | 2807 | preempt_enable(); |
9d65cb4a AD |
2808 | return -ERANGE; |
2809 | } | |
2810 | ||
a5c43dae AD |
2811 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2812 | unsigned long *offset, char *modname, char *name) | |
2813 | { | |
2814 | struct module *mod; | |
2815 | ||
cb2a5205 | 2816 | preempt_disable(); |
d72b3751 | 2817 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2818 | if (within_module_init(addr, mod) || |
2819 | within_module_core(addr, mod)) { | |
a5c43dae AD |
2820 | const char *sym; |
2821 | ||
2822 | sym = get_ksymbol(mod, addr, size, offset); | |
2823 | if (!sym) | |
2824 | goto out; | |
2825 | if (modname) | |
9281acea | 2826 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 2827 | if (name) |
9281acea | 2828 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 2829 | preempt_enable(); |
a5c43dae AD |
2830 | return 0; |
2831 | } | |
2832 | } | |
2833 | out: | |
cb2a5205 | 2834 | preempt_enable(); |
a5c43dae AD |
2835 | return -ERANGE; |
2836 | } | |
2837 | ||
ea07890a AD |
2838 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2839 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2840 | { |
2841 | struct module *mod; | |
2842 | ||
cb2a5205 | 2843 | preempt_disable(); |
d72b3751 | 2844 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
2845 | if (symnum < mod->num_symtab) { |
2846 | *value = mod->symtab[symnum].st_value; | |
2847 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2848 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
2849 | KSYM_NAME_LEN); |
2850 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 2851 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 2852 | preempt_enable(); |
ea07890a | 2853 | return 0; |
1da177e4 LT |
2854 | } |
2855 | symnum -= mod->num_symtab; | |
2856 | } | |
cb2a5205 | 2857 | preempt_enable(); |
ea07890a | 2858 | return -ERANGE; |
1da177e4 LT |
2859 | } |
2860 | ||
2861 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2862 | { | |
2863 | unsigned int i; | |
2864 | ||
2865 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2866 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2867 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2868 | return mod->symtab[i].st_value; |
2869 | return 0; | |
2870 | } | |
2871 | ||
2872 | /* Look for this name: can be of form module:name. */ | |
2873 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2874 | { | |
2875 | struct module *mod; | |
2876 | char *colon; | |
2877 | unsigned long ret = 0; | |
2878 | ||
2879 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 2880 | preempt_disable(); |
1da177e4 LT |
2881 | if ((colon = strchr(name, ':')) != NULL) { |
2882 | *colon = '\0'; | |
2883 | if ((mod = find_module(name)) != NULL) | |
2884 | ret = mod_find_symname(mod, colon+1); | |
2885 | *colon = ':'; | |
2886 | } else { | |
d72b3751 | 2887 | list_for_each_entry_rcu(mod, &modules, list) |
1da177e4 LT |
2888 | if ((ret = mod_find_symname(mod, name)) != 0) |
2889 | break; | |
2890 | } | |
cb2a5205 | 2891 | preempt_enable(); |
1da177e4 LT |
2892 | return ret; |
2893 | } | |
75a66614 AK |
2894 | |
2895 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
2896 | struct module *, unsigned long), | |
2897 | void *data) | |
2898 | { | |
2899 | struct module *mod; | |
2900 | unsigned int i; | |
2901 | int ret; | |
2902 | ||
2903 | list_for_each_entry(mod, &modules, list) { | |
2904 | for (i = 0; i < mod->num_symtab; i++) { | |
2905 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
2906 | mod, mod->symtab[i].st_value); | |
2907 | if (ret != 0) | |
2908 | return ret; | |
2909 | } | |
2910 | } | |
2911 | return 0; | |
2912 | } | |
1da177e4 LT |
2913 | #endif /* CONFIG_KALLSYMS */ |
2914 | ||
21aa9280 | 2915 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
2916 | { |
2917 | int bx = 0; | |
2918 | ||
21aa9280 AV |
2919 | if (mod->taints || |
2920 | mod->state == MODULE_STATE_GOING || | |
2921 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 2922 | buf[bx++] = '('; |
25ddbb18 | 2923 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e8 | 2924 | buf[bx++] = 'P'; |
25ddbb18 | 2925 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e8 | 2926 | buf[bx++] = 'F'; |
26e9a397 | 2927 | if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd3 | 2928 | buf[bx++] = 'C'; |
fa3ba2e8 FM |
2929 | /* |
2930 | * TAINT_FORCED_RMMOD: could be added. | |
2931 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
2932 | * apply to modules. | |
2933 | */ | |
21aa9280 AV |
2934 | |
2935 | /* Show a - for module-is-being-unloaded */ | |
2936 | if (mod->state == MODULE_STATE_GOING) | |
2937 | buf[bx++] = '-'; | |
2938 | /* Show a + for module-is-being-loaded */ | |
2939 | if (mod->state == MODULE_STATE_COMING) | |
2940 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
2941 | buf[bx++] = ')'; |
2942 | } | |
2943 | buf[bx] = '\0'; | |
2944 | ||
2945 | return buf; | |
2946 | } | |
2947 | ||
3b5d5c6b AD |
2948 | #ifdef CONFIG_PROC_FS |
2949 | /* Called by the /proc file system to return a list of modules. */ | |
2950 | static void *m_start(struct seq_file *m, loff_t *pos) | |
2951 | { | |
2952 | mutex_lock(&module_mutex); | |
2953 | return seq_list_start(&modules, *pos); | |
2954 | } | |
2955 | ||
2956 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
2957 | { | |
2958 | return seq_list_next(p, &modules, pos); | |
2959 | } | |
2960 | ||
2961 | static void m_stop(struct seq_file *m, void *p) | |
2962 | { | |
2963 | mutex_unlock(&module_mutex); | |
2964 | } | |
2965 | ||
1da177e4 LT |
2966 | static int m_show(struct seq_file *m, void *p) |
2967 | { | |
2968 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
2969 | char buf[8]; |
2970 | ||
2f0f2a33 | 2971 | seq_printf(m, "%s %u", |
1da177e4 LT |
2972 | mod->name, mod->init_size + mod->core_size); |
2973 | print_unload_info(m, mod); | |
2974 | ||
2975 | /* Informative for users. */ | |
2976 | seq_printf(m, " %s", | |
2977 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2978 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2979 | "Live"); | |
2980 | /* Used by oprofile and other similar tools. */ | |
2981 | seq_printf(m, " 0x%p", mod->module_core); | |
2982 | ||
fa3ba2e8 FM |
2983 | /* Taints info */ |
2984 | if (mod->taints) | |
21aa9280 | 2985 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 2986 | |
1da177e4 LT |
2987 | seq_printf(m, "\n"); |
2988 | return 0; | |
2989 | } | |
2990 | ||
2991 | /* Format: modulename size refcount deps address | |
2992 | ||
2993 | Where refcount is a number or -, and deps is a comma-separated list | |
2994 | of depends or -. | |
2995 | */ | |
3b5d5c6b | 2996 | static const struct seq_operations modules_op = { |
1da177e4 LT |
2997 | .start = m_start, |
2998 | .next = m_next, | |
2999 | .stop = m_stop, | |
3000 | .show = m_show | |
3001 | }; | |
3002 | ||
3b5d5c6b AD |
3003 | static int modules_open(struct inode *inode, struct file *file) |
3004 | { | |
3005 | return seq_open(file, &modules_op); | |
3006 | } | |
3007 | ||
3008 | static const struct file_operations proc_modules_operations = { | |
3009 | .open = modules_open, | |
3010 | .read = seq_read, | |
3011 | .llseek = seq_lseek, | |
3012 | .release = seq_release, | |
3013 | }; | |
3014 | ||
3015 | static int __init proc_modules_init(void) | |
3016 | { | |
3017 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3018 | return 0; | |
3019 | } | |
3020 | module_init(proc_modules_init); | |
3021 | #endif | |
3022 | ||
1da177e4 LT |
3023 | /* Given an address, look for it in the module exception tables. */ |
3024 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3025 | { | |
1da177e4 LT |
3026 | const struct exception_table_entry *e = NULL; |
3027 | struct module *mod; | |
3028 | ||
24da1cbf | 3029 | preempt_disable(); |
d72b3751 | 3030 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
3031 | if (mod->num_exentries == 0) |
3032 | continue; | |
22a8bdeb | 3033 | |
1da177e4 LT |
3034 | e = search_extable(mod->extable, |
3035 | mod->extable + mod->num_exentries - 1, | |
3036 | addr); | |
3037 | if (e) | |
3038 | break; | |
3039 | } | |
24da1cbf | 3040 | preempt_enable(); |
1da177e4 LT |
3041 | |
3042 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3043 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3044 | return e; |
3045 | } | |
3046 | ||
4d435f9d | 3047 | /* |
e610499e RR |
3048 | * is_module_address - is this address inside a module? |
3049 | * @addr: the address to check. | |
3050 | * | |
3051 | * See is_module_text_address() if you simply want to see if the address | |
3052 | * is code (not data). | |
4d435f9d | 3053 | */ |
e610499e | 3054 | bool is_module_address(unsigned long addr) |
4d435f9d | 3055 | { |
e610499e | 3056 | bool ret; |
4d435f9d | 3057 | |
24da1cbf | 3058 | preempt_disable(); |
e610499e | 3059 | ret = __module_address(addr) != NULL; |
24da1cbf | 3060 | preempt_enable(); |
4d435f9d | 3061 | |
e610499e | 3062 | return ret; |
4d435f9d IM |
3063 | } |
3064 | ||
e610499e RR |
3065 | /* |
3066 | * __module_address - get the module which contains an address. | |
3067 | * @addr: the address. | |
3068 | * | |
3069 | * Must be called with preempt disabled or module mutex held so that | |
3070 | * module doesn't get freed during this. | |
3071 | */ | |
714f83d5 | 3072 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3073 | { |
3074 | struct module *mod; | |
3075 | ||
3a642e99 RR |
3076 | if (addr < module_addr_min || addr > module_addr_max) |
3077 | return NULL; | |
3078 | ||
d72b3751 | 3079 | list_for_each_entry_rcu(mod, &modules, list) |
e610499e RR |
3080 | if (within_module_core(addr, mod) |
3081 | || within_module_init(addr, mod)) | |
1da177e4 LT |
3082 | return mod; |
3083 | return NULL; | |
3084 | } | |
c6b37801 | 3085 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3086 | |
e610499e RR |
3087 | /* |
3088 | * is_module_text_address - is this address inside module code? | |
3089 | * @addr: the address to check. | |
3090 | * | |
3091 | * See is_module_address() if you simply want to see if the address is | |
3092 | * anywhere in a module. See kernel_text_address() for testing if an | |
3093 | * address corresponds to kernel or module code. | |
3094 | */ | |
3095 | bool is_module_text_address(unsigned long addr) | |
3096 | { | |
3097 | bool ret; | |
3098 | ||
3099 | preempt_disable(); | |
3100 | ret = __module_text_address(addr) != NULL; | |
3101 | preempt_enable(); | |
3102 | ||
3103 | return ret; | |
3104 | } | |
3105 | ||
3106 | /* | |
3107 | * __module_text_address - get the module whose code contains an address. | |
3108 | * @addr: the address. | |
3109 | * | |
3110 | * Must be called with preempt disabled or module mutex held so that | |
3111 | * module doesn't get freed during this. | |
3112 | */ | |
3113 | struct module *__module_text_address(unsigned long addr) | |
3114 | { | |
3115 | struct module *mod = __module_address(addr); | |
3116 | if (mod) { | |
3117 | /* Make sure it's within the text section. */ | |
3118 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3119 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3120 | mod = NULL; | |
3121 | } | |
3122 | return mod; | |
3123 | } | |
c6b37801 | 3124 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3125 | |
1da177e4 LT |
3126 | /* Don't grab lock, we're oopsing. */ |
3127 | void print_modules(void) | |
3128 | { | |
3129 | struct module *mod; | |
2bc2d61a | 3130 | char buf[8]; |
1da177e4 | 3131 | |
b231125a | 3132 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3133 | /* Most callers should already have preempt disabled, but make sure */ |
3134 | preempt_disable(); | |
3135 | list_for_each_entry_rcu(mod, &modules, list) | |
21aa9280 | 3136 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b3751 | 3137 | preempt_enable(); |
e14af7ee AV |
3138 | if (last_unloaded_module[0]) |
3139 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3140 | printk("\n"); |
3141 | } | |
3142 | ||
1da177e4 | 3143 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3144 | /* Generate the signature for all relevant module structures here. |
3145 | * If these change, we don't want to try to parse the module. */ | |
3146 | void module_layout(struct module *mod, | |
3147 | struct modversion_info *ver, | |
3148 | struct kernel_param *kp, | |
3149 | struct kernel_symbol *ks, | |
8c8ef42a RR |
3150 | struct tracepoint *tp) |
3151 | { | |
3152 | } | |
3153 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3154 | #endif |
8256e47c | 3155 | |
97e1c18e MD |
3156 | #ifdef CONFIG_TRACEPOINTS |
3157 | void module_update_tracepoints(void) | |
3158 | { | |
3159 | struct module *mod; | |
3160 | ||
3161 | mutex_lock(&module_mutex); | |
3162 | list_for_each_entry(mod, &modules, list) | |
3163 | if (!mod->taints) | |
3164 | tracepoint_update_probe_range(mod->tracepoints, | |
3165 | mod->tracepoints + mod->num_tracepoints); | |
3166 | mutex_unlock(&module_mutex); | |
3167 | } | |
3168 | ||
3169 | /* | |
3170 | * Returns 0 if current not found. | |
3171 | * Returns 1 if current found. | |
3172 | */ | |
3173 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) | |
3174 | { | |
3175 | struct module *iter_mod; | |
3176 | int found = 0; | |
3177 | ||
3178 | mutex_lock(&module_mutex); | |
3179 | list_for_each_entry(iter_mod, &modules, list) { | |
3180 | if (!iter_mod->taints) { | |
3181 | /* | |
3182 | * Sorted module list | |
3183 | */ | |
3184 | if (iter_mod < iter->module) | |
3185 | continue; | |
3186 | else if (iter_mod > iter->module) | |
3187 | iter->tracepoint = NULL; | |
3188 | found = tracepoint_get_iter_range(&iter->tracepoint, | |
3189 | iter_mod->tracepoints, | |
3190 | iter_mod->tracepoints | |
3191 | + iter_mod->num_tracepoints); | |
3192 | if (found) { | |
3193 | iter->module = iter_mod; | |
3194 | break; | |
3195 | } | |
3196 | } | |
3197 | } | |
3198 | mutex_unlock(&module_mutex); | |
3199 | return found; | |
3200 | } | |
3201 | #endif |