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1da177e4 LT |
1 | /* Rewritten by Rusty Russell, on the backs of many others... |
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 | */ | |
19 | #include <linux/config.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/moduleloader.h> | |
22 | #include <linux/init.h> | |
9f158333 | 23 | #include <linux/kernel.h> |
1da177e4 LT |
24 | #include <linux/slab.h> |
25 | #include <linux/vmalloc.h> | |
26 | #include <linux/elf.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/syscalls.h> | |
29 | #include <linux/fcntl.h> | |
30 | #include <linux/rcupdate.h> | |
c59ede7b | 31 | #include <linux/capability.h> |
1da177e4 LT |
32 | #include <linux/cpu.h> |
33 | #include <linux/moduleparam.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/err.h> | |
36 | #include <linux/vermagic.h> | |
37 | #include <linux/notifier.h> | |
38 | #include <linux/stop_machine.h> | |
39 | #include <linux/device.h> | |
c988d2b2 | 40 | #include <linux/string.h> |
8c65b4a6 | 41 | #include <linux/sched.h> |
1da177e4 LT |
42 | #include <asm/uaccess.h> |
43 | #include <asm/semaphore.h> | |
44 | #include <asm/cacheflush.h> | |
45 | ||
46 | #if 0 | |
47 | #define DEBUGP printk | |
48 | #else | |
49 | #define DEBUGP(fmt , a...) | |
50 | #endif | |
51 | ||
52 | #ifndef ARCH_SHF_SMALL | |
53 | #define ARCH_SHF_SMALL 0 | |
54 | #endif | |
55 | ||
56 | /* If this is set, the section belongs in the init part of the module */ | |
57 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
58 | ||
59 | /* Protects module list */ | |
60 | static DEFINE_SPINLOCK(modlist_lock); | |
61 | ||
62 | /* List of modules, protected by module_mutex AND modlist_lock */ | |
63 | static DECLARE_MUTEX(module_mutex); | |
64 | static LIST_HEAD(modules); | |
65 | ||
66 | static DECLARE_MUTEX(notify_mutex); | |
67 | static struct notifier_block * module_notify_list; | |
68 | ||
69 | int register_module_notifier(struct notifier_block * nb) | |
70 | { | |
71 | int err; | |
72 | down(¬ify_mutex); | |
73 | err = notifier_chain_register(&module_notify_list, nb); | |
74 | up(¬ify_mutex); | |
75 | return err; | |
76 | } | |
77 | EXPORT_SYMBOL(register_module_notifier); | |
78 | ||
79 | int unregister_module_notifier(struct notifier_block * nb) | |
80 | { | |
81 | int err; | |
82 | down(¬ify_mutex); | |
83 | err = notifier_chain_unregister(&module_notify_list, nb); | |
84 | up(¬ify_mutex); | |
85 | return err; | |
86 | } | |
87 | EXPORT_SYMBOL(unregister_module_notifier); | |
88 | ||
89 | /* We require a truly strong try_module_get() */ | |
90 | static inline int strong_try_module_get(struct module *mod) | |
91 | { | |
92 | if (mod && mod->state == MODULE_STATE_COMING) | |
93 | return 0; | |
94 | return try_module_get(mod); | |
95 | } | |
96 | ||
97 | /* A thread that wants to hold a reference to a module only while it | |
98 | * is running can call ths to safely exit. | |
99 | * nfsd and lockd use this. | |
100 | */ | |
101 | void __module_put_and_exit(struct module *mod, long code) | |
102 | { | |
103 | module_put(mod); | |
104 | do_exit(code); | |
105 | } | |
106 | EXPORT_SYMBOL(__module_put_and_exit); | |
107 | ||
108 | /* Find a module section: 0 means not found. */ | |
109 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
110 | Elf_Shdr *sechdrs, | |
111 | const char *secstrings, | |
112 | const char *name) | |
113 | { | |
114 | unsigned int i; | |
115 | ||
116 | for (i = 1; i < hdr->e_shnum; i++) | |
117 | /* Alloc bit cleared means "ignore it." */ | |
118 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
119 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
120 | return i; | |
121 | return 0; | |
122 | } | |
123 | ||
124 | /* Provided by the linker */ | |
125 | extern const struct kernel_symbol __start___ksymtab[]; | |
126 | extern const struct kernel_symbol __stop___ksymtab[]; | |
127 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
128 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
129 | extern const unsigned long __start___kcrctab[]; | |
130 | extern const unsigned long __start___kcrctab_gpl[]; | |
131 | ||
132 | #ifndef CONFIG_MODVERSIONS | |
133 | #define symversion(base, idx) NULL | |
134 | #else | |
135 | #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL) | |
136 | #endif | |
137 | ||
3fd6805f SR |
138 | /* lookup symbol in given range of kernel_symbols */ |
139 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
140 | const struct kernel_symbol *start, | |
141 | const struct kernel_symbol *stop) | |
142 | { | |
143 | const struct kernel_symbol *ks = start; | |
144 | for (; ks < stop; ks++) | |
145 | if (strcmp(ks->name, name) == 0) | |
146 | return ks; | |
147 | return NULL; | |
148 | } | |
149 | ||
1da177e4 LT |
150 | /* Find a symbol, return value, crc and module which owns it */ |
151 | static unsigned long __find_symbol(const char *name, | |
152 | struct module **owner, | |
153 | const unsigned long **crc, | |
154 | int gplok) | |
155 | { | |
156 | struct module *mod; | |
3fd6805f | 157 | const struct kernel_symbol *ks; |
1da177e4 LT |
158 | |
159 | /* Core kernel first. */ | |
160 | *owner = NULL; | |
3fd6805f SR |
161 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
162 | if (ks) { | |
163 | *crc = symversion(__start___kcrctab, (ks - __start___ksymtab)); | |
164 | return ks->value; | |
1da177e4 LT |
165 | } |
166 | if (gplok) { | |
3fd6805f SR |
167 | ks = lookup_symbol(name, __start___ksymtab_gpl, |
168 | __stop___ksymtab_gpl); | |
169 | if (ks) { | |
170 | *crc = symversion(__start___kcrctab_gpl, | |
171 | (ks - __start___ksymtab_gpl)); | |
172 | return ks->value; | |
173 | } | |
1da177e4 LT |
174 | } |
175 | ||
176 | /* Now try modules. */ | |
177 | list_for_each_entry(mod, &modules, list) { | |
178 | *owner = mod; | |
3fd6805f SR |
179 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
180 | if (ks) { | |
181 | *crc = symversion(mod->crcs, (ks - mod->syms)); | |
182 | return ks->value; | |
183 | } | |
1da177e4 LT |
184 | |
185 | if (gplok) { | |
3fd6805f SR |
186 | ks = lookup_symbol(name, mod->gpl_syms, |
187 | mod->gpl_syms + mod->num_gpl_syms); | |
188 | if (ks) { | |
189 | *crc = symversion(mod->gpl_crcs, | |
190 | (ks - mod->gpl_syms)); | |
191 | return ks->value; | |
1da177e4 LT |
192 | } |
193 | } | |
194 | } | |
195 | DEBUGP("Failed to find symbol %s\n", name); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | /* Find a symbol in this elf symbol table */ | |
200 | static unsigned long find_local_symbol(Elf_Shdr *sechdrs, | |
201 | unsigned int symindex, | |
202 | const char *strtab, | |
203 | const char *name) | |
204 | { | |
205 | unsigned int i; | |
206 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
207 | ||
208 | /* Search (defined) internal symbols first. */ | |
209 | for (i = 1; i < sechdrs[symindex].sh_size/sizeof(*sym); i++) { | |
210 | if (sym[i].st_shndx != SHN_UNDEF | |
211 | && strcmp(name, strtab + sym[i].st_name) == 0) | |
212 | return sym[i].st_value; | |
213 | } | |
214 | return 0; | |
215 | } | |
216 | ||
217 | /* Search for module by name: must hold module_mutex. */ | |
218 | static struct module *find_module(const char *name) | |
219 | { | |
220 | struct module *mod; | |
221 | ||
222 | list_for_each_entry(mod, &modules, list) { | |
223 | if (strcmp(mod->name, name) == 0) | |
224 | return mod; | |
225 | } | |
226 | return NULL; | |
227 | } | |
228 | ||
229 | #ifdef CONFIG_SMP | |
230 | /* Number of blocks used and allocated. */ | |
231 | static unsigned int pcpu_num_used, pcpu_num_allocated; | |
232 | /* Size of each block. -ve means used. */ | |
233 | static int *pcpu_size; | |
234 | ||
235 | static int split_block(unsigned int i, unsigned short size) | |
236 | { | |
237 | /* Reallocation required? */ | |
238 | if (pcpu_num_used + 1 > pcpu_num_allocated) { | |
239 | int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2, | |
240 | GFP_KERNEL); | |
241 | if (!new) | |
242 | return 0; | |
243 | ||
244 | memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated); | |
245 | pcpu_num_allocated *= 2; | |
246 | kfree(pcpu_size); | |
247 | pcpu_size = new; | |
248 | } | |
249 | ||
250 | /* Insert a new subblock */ | |
251 | memmove(&pcpu_size[i+1], &pcpu_size[i], | |
252 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); | |
253 | pcpu_num_used++; | |
254 | ||
255 | pcpu_size[i+1] -= size; | |
256 | pcpu_size[i] = size; | |
257 | return 1; | |
258 | } | |
259 | ||
260 | static inline unsigned int block_size(int val) | |
261 | { | |
262 | if (val < 0) | |
263 | return -val; | |
264 | return val; | |
265 | } | |
266 | ||
267 | /* Created by linker magic */ | |
268 | extern char __per_cpu_start[], __per_cpu_end[]; | |
269 | ||
842bbaaa RR |
270 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
271 | const char *name) | |
1da177e4 LT |
272 | { |
273 | unsigned long extra; | |
274 | unsigned int i; | |
275 | void *ptr; | |
276 | ||
842bbaaa RR |
277 | if (align > SMP_CACHE_BYTES) { |
278 | printk(KERN_WARNING "%s: per-cpu alignment %li > %i\n", | |
279 | name, align, SMP_CACHE_BYTES); | |
280 | align = SMP_CACHE_BYTES; | |
281 | } | |
1da177e4 LT |
282 | |
283 | ptr = __per_cpu_start; | |
284 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
285 | /* Extra for alignment requirement. */ | |
286 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; | |
287 | BUG_ON(i == 0 && extra != 0); | |
288 | ||
289 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) | |
290 | continue; | |
291 | ||
292 | /* Transfer extra to previous block. */ | |
293 | if (pcpu_size[i-1] < 0) | |
294 | pcpu_size[i-1] -= extra; | |
295 | else | |
296 | pcpu_size[i-1] += extra; | |
297 | pcpu_size[i] -= extra; | |
298 | ptr += extra; | |
299 | ||
300 | /* Split block if warranted */ | |
301 | if (pcpu_size[i] - size > sizeof(unsigned long)) | |
302 | if (!split_block(i, size)) | |
303 | return NULL; | |
304 | ||
305 | /* Mark allocated */ | |
306 | pcpu_size[i] = -pcpu_size[i]; | |
307 | return ptr; | |
308 | } | |
309 | ||
310 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", | |
311 | size); | |
312 | return NULL; | |
313 | } | |
314 | ||
315 | static void percpu_modfree(void *freeme) | |
316 | { | |
317 | unsigned int i; | |
318 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); | |
319 | ||
320 | /* First entry is core kernel percpu data. */ | |
321 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
322 | if (ptr == freeme) { | |
323 | pcpu_size[i] = -pcpu_size[i]; | |
324 | goto free; | |
325 | } | |
326 | } | |
327 | BUG(); | |
328 | ||
329 | free: | |
330 | /* Merge with previous? */ | |
331 | if (pcpu_size[i-1] >= 0) { | |
332 | pcpu_size[i-1] += pcpu_size[i]; | |
333 | pcpu_num_used--; | |
334 | memmove(&pcpu_size[i], &pcpu_size[i+1], | |
335 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); | |
336 | i--; | |
337 | } | |
338 | /* Merge with next? */ | |
339 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { | |
340 | pcpu_size[i] += pcpu_size[i+1]; | |
341 | pcpu_num_used--; | |
342 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], | |
343 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); | |
344 | } | |
345 | } | |
346 | ||
347 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
348 | Elf_Shdr *sechdrs, | |
349 | const char *secstrings) | |
350 | { | |
351 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); | |
352 | } | |
353 | ||
354 | static int percpu_modinit(void) | |
355 | { | |
356 | pcpu_num_used = 2; | |
357 | pcpu_num_allocated = 2; | |
358 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, | |
359 | GFP_KERNEL); | |
360 | /* Static in-kernel percpu data (used). */ | |
361 | pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES); | |
362 | /* Free room. */ | |
363 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; | |
364 | if (pcpu_size[1] < 0) { | |
365 | printk(KERN_ERR "No per-cpu room for modules.\n"); | |
366 | pcpu_num_used = 1; | |
367 | } | |
368 | ||
369 | return 0; | |
370 | } | |
371 | __initcall(percpu_modinit); | |
372 | #else /* ... !CONFIG_SMP */ | |
842bbaaa RR |
373 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
374 | const char *name) | |
1da177e4 LT |
375 | { |
376 | return NULL; | |
377 | } | |
378 | static inline void percpu_modfree(void *pcpuptr) | |
379 | { | |
380 | BUG(); | |
381 | } | |
382 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
383 | Elf_Shdr *sechdrs, | |
384 | const char *secstrings) | |
385 | { | |
386 | return 0; | |
387 | } | |
388 | static inline void percpu_modcopy(void *pcpudst, const void *src, | |
389 | unsigned long size) | |
390 | { | |
391 | /* pcpusec should be 0, and size of that section should be 0. */ | |
392 | BUG_ON(size != 0); | |
393 | } | |
394 | #endif /* CONFIG_SMP */ | |
395 | ||
396 | #ifdef CONFIG_MODULE_UNLOAD | |
c988d2b2 MD |
397 | #define MODINFO_ATTR(field) \ |
398 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
399 | { \ | |
400 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
401 | } \ | |
402 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
403 | struct module *mod, char *buffer) \ | |
404 | { \ | |
405 | return sprintf(buffer, "%s\n", mod->field); \ | |
406 | } \ | |
407 | static int modinfo_##field##_exists(struct module *mod) \ | |
408 | { \ | |
409 | return mod->field != NULL; \ | |
410 | } \ | |
411 | static void free_modinfo_##field(struct module *mod) \ | |
412 | { \ | |
413 | kfree(mod->field); \ | |
414 | mod->field = NULL; \ | |
415 | } \ | |
416 | static struct module_attribute modinfo_##field = { \ | |
417 | .attr = { .name = __stringify(field), .mode = 0444, \ | |
418 | .owner = THIS_MODULE }, \ | |
419 | .show = show_modinfo_##field, \ | |
420 | .setup = setup_modinfo_##field, \ | |
421 | .test = modinfo_##field##_exists, \ | |
422 | .free = free_modinfo_##field, \ | |
423 | }; | |
424 | ||
425 | MODINFO_ATTR(version); | |
426 | MODINFO_ATTR(srcversion); | |
427 | ||
428 | static struct module_attribute *modinfo_attrs[] = { | |
429 | &modinfo_version, | |
430 | &modinfo_srcversion, | |
431 | NULL, | |
432 | }; | |
433 | ||
1da177e4 LT |
434 | /* Init the unload section of the module. */ |
435 | static void module_unload_init(struct module *mod) | |
436 | { | |
437 | unsigned int i; | |
438 | ||
439 | INIT_LIST_HEAD(&mod->modules_which_use_me); | |
440 | for (i = 0; i < NR_CPUS; i++) | |
441 | local_set(&mod->ref[i].count, 0); | |
442 | /* Hold reference count during initialization. */ | |
39c715b7 | 443 | local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
1da177e4 LT |
444 | /* Backwards compatibility macros put refcount during init. */ |
445 | mod->waiter = current; | |
446 | } | |
447 | ||
448 | /* modules using other modules */ | |
449 | struct module_use | |
450 | { | |
451 | struct list_head list; | |
452 | struct module *module_which_uses; | |
453 | }; | |
454 | ||
455 | /* Does a already use b? */ | |
456 | static int already_uses(struct module *a, struct module *b) | |
457 | { | |
458 | struct module_use *use; | |
459 | ||
460 | list_for_each_entry(use, &b->modules_which_use_me, list) { | |
461 | if (use->module_which_uses == a) { | |
462 | DEBUGP("%s uses %s!\n", a->name, b->name); | |
463 | return 1; | |
464 | } | |
465 | } | |
466 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
467 | return 0; | |
468 | } | |
469 | ||
470 | /* Module a uses b */ | |
471 | static int use_module(struct module *a, struct module *b) | |
472 | { | |
473 | struct module_use *use; | |
474 | if (b == NULL || already_uses(a, b)) return 1; | |
475 | ||
476 | if (!strong_try_module_get(b)) | |
477 | return 0; | |
478 | ||
479 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
480 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
481 | if (!use) { | |
482 | printk("%s: out of memory loading\n", a->name); | |
483 | module_put(b); | |
484 | return 0; | |
485 | } | |
486 | ||
487 | use->module_which_uses = a; | |
488 | list_add(&use->list, &b->modules_which_use_me); | |
489 | return 1; | |
490 | } | |
491 | ||
492 | /* Clear the unload stuff of the module. */ | |
493 | static void module_unload_free(struct module *mod) | |
494 | { | |
495 | struct module *i; | |
496 | ||
497 | list_for_each_entry(i, &modules, list) { | |
498 | struct module_use *use; | |
499 | ||
500 | list_for_each_entry(use, &i->modules_which_use_me, list) { | |
501 | if (use->module_which_uses == mod) { | |
502 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
503 | module_put(i); | |
504 | list_del(&use->list); | |
505 | kfree(use); | |
506 | /* There can be at most one match. */ | |
507 | break; | |
508 | } | |
509 | } | |
510 | } | |
511 | } | |
512 | ||
513 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 514 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
515 | { |
516 | int ret = (flags & O_TRUNC); | |
517 | if (ret) | |
fb169793 | 518 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
519 | return ret; |
520 | } | |
521 | #else | |
fb169793 | 522 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
523 | { |
524 | return 0; | |
525 | } | |
526 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
527 | ||
528 | struct stopref | |
529 | { | |
530 | struct module *mod; | |
531 | int flags; | |
532 | int *forced; | |
533 | }; | |
534 | ||
535 | /* Whole machine is stopped with interrupts off when this runs. */ | |
536 | static int __try_stop_module(void *_sref) | |
537 | { | |
538 | struct stopref *sref = _sref; | |
539 | ||
540 | /* If it's not unused, quit unless we are told to block. */ | |
541 | if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) { | |
fb169793 | 542 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
543 | return -EWOULDBLOCK; |
544 | } | |
545 | ||
546 | /* Mark it as dying. */ | |
547 | sref->mod->state = MODULE_STATE_GOING; | |
548 | return 0; | |
549 | } | |
550 | ||
551 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
552 | { | |
553 | struct stopref sref = { mod, flags, forced }; | |
554 | ||
555 | return stop_machine_run(__try_stop_module, &sref, NR_CPUS); | |
556 | } | |
557 | ||
558 | unsigned int module_refcount(struct module *mod) | |
559 | { | |
560 | unsigned int i, total = 0; | |
561 | ||
562 | for (i = 0; i < NR_CPUS; i++) | |
563 | total += local_read(&mod->ref[i].count); | |
564 | return total; | |
565 | } | |
566 | EXPORT_SYMBOL(module_refcount); | |
567 | ||
568 | /* This exists whether we can unload or not */ | |
569 | static void free_module(struct module *mod); | |
570 | ||
571 | static void wait_for_zero_refcount(struct module *mod) | |
572 | { | |
573 | /* Since we might sleep for some time, drop the semaphore first */ | |
574 | up(&module_mutex); | |
575 | for (;;) { | |
576 | DEBUGP("Looking at refcount...\n"); | |
577 | set_current_state(TASK_UNINTERRUPTIBLE); | |
578 | if (module_refcount(mod) == 0) | |
579 | break; | |
580 | schedule(); | |
581 | } | |
582 | current->state = TASK_RUNNING; | |
583 | down(&module_mutex); | |
584 | } | |
585 | ||
586 | asmlinkage long | |
587 | sys_delete_module(const char __user *name_user, unsigned int flags) | |
588 | { | |
589 | struct module *mod; | |
590 | char name[MODULE_NAME_LEN]; | |
591 | int ret, forced = 0; | |
592 | ||
593 | if (!capable(CAP_SYS_MODULE)) | |
594 | return -EPERM; | |
595 | ||
596 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
597 | return -EFAULT; | |
598 | name[MODULE_NAME_LEN-1] = '\0'; | |
599 | ||
600 | if (down_interruptible(&module_mutex) != 0) | |
601 | return -EINTR; | |
602 | ||
603 | mod = find_module(name); | |
604 | if (!mod) { | |
605 | ret = -ENOENT; | |
606 | goto out; | |
607 | } | |
608 | ||
609 | if (!list_empty(&mod->modules_which_use_me)) { | |
610 | /* Other modules depend on us: get rid of them first. */ | |
611 | ret = -EWOULDBLOCK; | |
612 | goto out; | |
613 | } | |
614 | ||
615 | /* Doing init or already dying? */ | |
616 | if (mod->state != MODULE_STATE_LIVE) { | |
617 | /* FIXME: if (force), slam module count and wake up | |
618 | waiter --RR */ | |
619 | DEBUGP("%s already dying\n", mod->name); | |
620 | ret = -EBUSY; | |
621 | goto out; | |
622 | } | |
623 | ||
624 | /* If it has an init func, it must have an exit func to unload */ | |
625 | if ((mod->init != NULL && mod->exit == NULL) | |
626 | || mod->unsafe) { | |
fb169793 | 627 | forced = try_force_unload(flags); |
1da177e4 LT |
628 | if (!forced) { |
629 | /* This module can't be removed */ | |
630 | ret = -EBUSY; | |
631 | goto out; | |
632 | } | |
633 | } | |
634 | ||
635 | /* Set this up before setting mod->state */ | |
636 | mod->waiter = current; | |
637 | ||
638 | /* Stop the machine so refcounts can't move and disable module. */ | |
639 | ret = try_stop_module(mod, flags, &forced); | |
640 | if (ret != 0) | |
641 | goto out; | |
642 | ||
643 | /* Never wait if forced. */ | |
644 | if (!forced && module_refcount(mod) != 0) | |
645 | wait_for_zero_refcount(mod); | |
646 | ||
647 | /* Final destruction now noone is using it. */ | |
648 | if (mod->exit != NULL) { | |
649 | up(&module_mutex); | |
650 | mod->exit(); | |
651 | down(&module_mutex); | |
652 | } | |
653 | free_module(mod); | |
654 | ||
655 | out: | |
656 | up(&module_mutex); | |
657 | return ret; | |
658 | } | |
659 | ||
660 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
661 | { | |
662 | struct module_use *use; | |
663 | int printed_something = 0; | |
664 | ||
665 | seq_printf(m, " %u ", module_refcount(mod)); | |
666 | ||
667 | /* Always include a trailing , so userspace can differentiate | |
668 | between this and the old multi-field proc format. */ | |
669 | list_for_each_entry(use, &mod->modules_which_use_me, list) { | |
670 | printed_something = 1; | |
671 | seq_printf(m, "%s,", use->module_which_uses->name); | |
672 | } | |
673 | ||
674 | if (mod->unsafe) { | |
675 | printed_something = 1; | |
676 | seq_printf(m, "[unsafe],"); | |
677 | } | |
678 | ||
679 | if (mod->init != NULL && mod->exit == NULL) { | |
680 | printed_something = 1; | |
681 | seq_printf(m, "[permanent],"); | |
682 | } | |
683 | ||
684 | if (!printed_something) | |
685 | seq_printf(m, "-"); | |
686 | } | |
687 | ||
688 | void __symbol_put(const char *symbol) | |
689 | { | |
690 | struct module *owner; | |
691 | unsigned long flags; | |
692 | const unsigned long *crc; | |
693 | ||
694 | spin_lock_irqsave(&modlist_lock, flags); | |
695 | if (!__find_symbol(symbol, &owner, &crc, 1)) | |
696 | BUG(); | |
697 | module_put(owner); | |
698 | spin_unlock_irqrestore(&modlist_lock, flags); | |
699 | } | |
700 | EXPORT_SYMBOL(__symbol_put); | |
701 | ||
702 | void symbol_put_addr(void *addr) | |
703 | { | |
704 | unsigned long flags; | |
705 | ||
706 | spin_lock_irqsave(&modlist_lock, flags); | |
707 | if (!kernel_text_address((unsigned long)addr)) | |
708 | BUG(); | |
709 | ||
710 | module_put(module_text_address((unsigned long)addr)); | |
711 | spin_unlock_irqrestore(&modlist_lock, flags); | |
712 | } | |
713 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
714 | ||
715 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
716 | struct module *mod, char *buffer) | |
717 | { | |
718 | /* sysfs holds a reference */ | |
719 | return sprintf(buffer, "%u\n", module_refcount(mod)-1); | |
720 | } | |
721 | ||
722 | static struct module_attribute refcnt = { | |
723 | .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE }, | |
724 | .show = show_refcnt, | |
725 | }; | |
726 | ||
727 | #else /* !CONFIG_MODULE_UNLOAD */ | |
728 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
729 | { | |
730 | /* We don't know the usage count, or what modules are using. */ | |
731 | seq_printf(m, " - -"); | |
732 | } | |
733 | ||
734 | static inline void module_unload_free(struct module *mod) | |
735 | { | |
736 | } | |
737 | ||
738 | static inline int use_module(struct module *a, struct module *b) | |
739 | { | |
740 | return strong_try_module_get(b); | |
741 | } | |
742 | ||
743 | static inline void module_unload_init(struct module *mod) | |
744 | { | |
745 | } | |
746 | #endif /* CONFIG_MODULE_UNLOAD */ | |
747 | ||
748 | #ifdef CONFIG_OBSOLETE_MODPARM | |
749 | /* Bounds checking done below */ | |
750 | static int obsparm_copy_string(const char *val, struct kernel_param *kp) | |
751 | { | |
752 | strcpy(kp->arg, val); | |
753 | return 0; | |
754 | } | |
755 | ||
52c1da39 | 756 | static int set_obsolete(const char *val, struct kernel_param *kp) |
1da177e4 LT |
757 | { |
758 | unsigned int min, max; | |
759 | unsigned int size, maxsize; | |
760 | int dummy; | |
761 | char *endp; | |
762 | const char *p; | |
763 | struct obsolete_modparm *obsparm = kp->arg; | |
764 | ||
765 | if (!val) { | |
766 | printk(KERN_ERR "Parameter %s needs an argument\n", kp->name); | |
767 | return -EINVAL; | |
768 | } | |
769 | ||
770 | /* type is: [min[-max]]{b,h,i,l,s} */ | |
771 | p = obsparm->type; | |
772 | min = simple_strtol(p, &endp, 10); | |
773 | if (endp == obsparm->type) | |
774 | min = max = 1; | |
775 | else if (*endp == '-') { | |
776 | p = endp+1; | |
777 | max = simple_strtol(p, &endp, 10); | |
778 | } else | |
779 | max = min; | |
780 | switch (*endp) { | |
781 | case 'b': | |
782 | return param_array(kp->name, val, min, max, obsparm->addr, | |
783 | 1, param_set_byte, &dummy); | |
784 | case 'h': | |
785 | return param_array(kp->name, val, min, max, obsparm->addr, | |
786 | sizeof(short), param_set_short, &dummy); | |
787 | case 'i': | |
788 | return param_array(kp->name, val, min, max, obsparm->addr, | |
789 | sizeof(int), param_set_int, &dummy); | |
790 | case 'l': | |
791 | return param_array(kp->name, val, min, max, obsparm->addr, | |
792 | sizeof(long), param_set_long, &dummy); | |
793 | case 's': | |
794 | return param_array(kp->name, val, min, max, obsparm->addr, | |
795 | sizeof(char *), param_set_charp, &dummy); | |
796 | ||
797 | case 'c': | |
798 | /* Undocumented: 1-5c50 means 1-5 strings of up to 49 chars, | |
799 | and the decl is "char xxx[5][50];" */ | |
800 | p = endp+1; | |
801 | maxsize = simple_strtol(p, &endp, 10); | |
802 | /* We check lengths here (yes, this is a hack). */ | |
803 | p = val; | |
804 | while (p[size = strcspn(p, ",")]) { | |
805 | if (size >= maxsize) | |
806 | goto oversize; | |
807 | p += size+1; | |
808 | } | |
809 | if (size >= maxsize) | |
810 | goto oversize; | |
811 | return param_array(kp->name, val, min, max, obsparm->addr, | |
812 | maxsize, obsparm_copy_string, &dummy); | |
813 | } | |
814 | printk(KERN_ERR "Unknown obsolete parameter type %s\n", obsparm->type); | |
815 | return -EINVAL; | |
816 | oversize: | |
817 | printk(KERN_ERR | |
818 | "Parameter %s doesn't fit in %u chars.\n", kp->name, maxsize); | |
819 | return -EINVAL; | |
820 | } | |
821 | ||
822 | static int obsolete_params(const char *name, | |
823 | char *args, | |
824 | struct obsolete_modparm obsparm[], | |
825 | unsigned int num, | |
826 | Elf_Shdr *sechdrs, | |
827 | unsigned int symindex, | |
828 | const char *strtab) | |
829 | { | |
830 | struct kernel_param *kp; | |
831 | unsigned int i; | |
832 | int ret; | |
833 | ||
834 | kp = kmalloc(sizeof(kp[0]) * num, GFP_KERNEL); | |
835 | if (!kp) | |
836 | return -ENOMEM; | |
837 | ||
838 | for (i = 0; i < num; i++) { | |
839 | char sym_name[128 + sizeof(MODULE_SYMBOL_PREFIX)]; | |
840 | ||
841 | snprintf(sym_name, sizeof(sym_name), "%s%s", | |
842 | MODULE_SYMBOL_PREFIX, obsparm[i].name); | |
843 | ||
844 | kp[i].name = obsparm[i].name; | |
845 | kp[i].perm = 000; | |
846 | kp[i].set = set_obsolete; | |
847 | kp[i].get = NULL; | |
848 | obsparm[i].addr | |
849 | = (void *)find_local_symbol(sechdrs, symindex, strtab, | |
850 | sym_name); | |
851 | if (!obsparm[i].addr) { | |
852 | printk("%s: falsely claims to have parameter %s\n", | |
853 | name, obsparm[i].name); | |
854 | ret = -EINVAL; | |
855 | goto out; | |
856 | } | |
857 | kp[i].arg = &obsparm[i]; | |
858 | } | |
859 | ||
860 | ret = parse_args(name, args, kp, num, NULL); | |
861 | out: | |
862 | kfree(kp); | |
863 | return ret; | |
864 | } | |
865 | #else | |
866 | static int obsolete_params(const char *name, | |
867 | char *args, | |
868 | struct obsolete_modparm obsparm[], | |
869 | unsigned int num, | |
870 | Elf_Shdr *sechdrs, | |
871 | unsigned int symindex, | |
872 | const char *strtab) | |
873 | { | |
874 | if (num != 0) | |
875 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", | |
876 | name); | |
877 | return 0; | |
878 | } | |
879 | #endif /* CONFIG_OBSOLETE_MODPARM */ | |
880 | ||
881 | static const char vermagic[] = VERMAGIC_STRING; | |
882 | ||
883 | #ifdef CONFIG_MODVERSIONS | |
884 | static int check_version(Elf_Shdr *sechdrs, | |
885 | unsigned int versindex, | |
886 | const char *symname, | |
887 | struct module *mod, | |
888 | const unsigned long *crc) | |
889 | { | |
890 | unsigned int i, num_versions; | |
891 | struct modversion_info *versions; | |
892 | ||
893 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
894 | if (!crc) | |
895 | return 1; | |
896 | ||
897 | versions = (void *) sechdrs[versindex].sh_addr; | |
898 | num_versions = sechdrs[versindex].sh_size | |
899 | / sizeof(struct modversion_info); | |
900 | ||
901 | for (i = 0; i < num_versions; i++) { | |
902 | if (strcmp(versions[i].name, symname) != 0) | |
903 | continue; | |
904 | ||
905 | if (versions[i].crc == *crc) | |
906 | return 1; | |
907 | printk("%s: disagrees about version of symbol %s\n", | |
908 | mod->name, symname); | |
909 | DEBUGP("Found checksum %lX vs module %lX\n", | |
910 | *crc, versions[i].crc); | |
911 | return 0; | |
912 | } | |
913 | /* Not in module's version table. OK, but that taints the kernel. */ | |
914 | if (!(tainted & TAINT_FORCED_MODULE)) { | |
915 | printk("%s: no version for \"%s\" found: kernel tainted.\n", | |
916 | mod->name, symname); | |
9f158333 | 917 | add_taint(TAINT_FORCED_MODULE); |
1da177e4 LT |
918 | } |
919 | return 1; | |
920 | } | |
921 | ||
922 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
923 | unsigned int versindex, | |
924 | struct module *mod) | |
925 | { | |
926 | const unsigned long *crc; | |
927 | struct module *owner; | |
928 | ||
929 | if (!__find_symbol("struct_module", &owner, &crc, 1)) | |
930 | BUG(); | |
931 | return check_version(sechdrs, versindex, "struct_module", mod, | |
932 | crc); | |
933 | } | |
934 | ||
935 | /* First part is kernel version, which we ignore. */ | |
936 | static inline int same_magic(const char *amagic, const char *bmagic) | |
937 | { | |
938 | amagic += strcspn(amagic, " "); | |
939 | bmagic += strcspn(bmagic, " "); | |
940 | return strcmp(amagic, bmagic) == 0; | |
941 | } | |
942 | #else | |
943 | static inline int check_version(Elf_Shdr *sechdrs, | |
944 | unsigned int versindex, | |
945 | const char *symname, | |
946 | struct module *mod, | |
947 | const unsigned long *crc) | |
948 | { | |
949 | return 1; | |
950 | } | |
951 | ||
952 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
953 | unsigned int versindex, | |
954 | struct module *mod) | |
955 | { | |
956 | return 1; | |
957 | } | |
958 | ||
959 | static inline int same_magic(const char *amagic, const char *bmagic) | |
960 | { | |
961 | return strcmp(amagic, bmagic) == 0; | |
962 | } | |
963 | #endif /* CONFIG_MODVERSIONS */ | |
964 | ||
965 | /* Resolve a symbol for this module. I.e. if we find one, record usage. | |
966 | Must be holding module_mutex. */ | |
967 | static unsigned long resolve_symbol(Elf_Shdr *sechdrs, | |
968 | unsigned int versindex, | |
969 | const char *name, | |
970 | struct module *mod) | |
971 | { | |
972 | struct module *owner; | |
973 | unsigned long ret; | |
974 | const unsigned long *crc; | |
975 | ||
1da177e4 LT |
976 | ret = __find_symbol(name, &owner, &crc, mod->license_gplok); |
977 | if (ret) { | |
978 | /* use_module can fail due to OOM, or module unloading */ | |
979 | if (!check_version(sechdrs, versindex, name, mod, crc) || | |
980 | !use_module(mod, owner)) | |
981 | ret = 0; | |
982 | } | |
1da177e4 LT |
983 | return ret; |
984 | } | |
985 | ||
986 | ||
987 | /* | |
988 | * /sys/module/foo/sections stuff | |
989 | * J. Corbet <corbet@lwn.net> | |
990 | */ | |
991 | #ifdef CONFIG_KALLSYMS | |
992 | static ssize_t module_sect_show(struct module_attribute *mattr, | |
993 | struct module *mod, char *buf) | |
994 | { | |
995 | struct module_sect_attr *sattr = | |
996 | container_of(mattr, struct module_sect_attr, mattr); | |
997 | return sprintf(buf, "0x%lx\n", sattr->address); | |
998 | } | |
999 | ||
1000 | static void add_sect_attrs(struct module *mod, unsigned int nsect, | |
1001 | char *secstrings, Elf_Shdr *sechdrs) | |
1002 | { | |
1003 | unsigned int nloaded = 0, i, size[2]; | |
1004 | struct module_sect_attrs *sect_attrs; | |
1005 | struct module_sect_attr *sattr; | |
1006 | struct attribute **gattr; | |
1007 | ||
1008 | /* Count loaded sections and allocate structures */ | |
1009 | for (i = 0; i < nsect; i++) | |
1010 | if (sechdrs[i].sh_flags & SHF_ALLOC) | |
1011 | nloaded++; | |
1012 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1013 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1014 | sizeof(sect_attrs->grp.attrs[0])); | |
1015 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
1016 | if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL))) | |
1017 | return; | |
1018 | ||
1019 | /* Setup section attributes. */ | |
1020 | sect_attrs->grp.name = "sections"; | |
1021 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1022 | ||
1023 | sattr = §_attrs->attrs[0]; | |
1024 | gattr = §_attrs->grp.attrs[0]; | |
1025 | for (i = 0; i < nsect; i++) { | |
1026 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) | |
1027 | continue; | |
1028 | sattr->address = sechdrs[i].sh_addr; | |
1029 | strlcpy(sattr->name, secstrings + sechdrs[i].sh_name, | |
1030 | MODULE_SECT_NAME_LEN); | |
1031 | sattr->mattr.show = module_sect_show; | |
1032 | sattr->mattr.store = NULL; | |
1033 | sattr->mattr.attr.name = sattr->name; | |
1034 | sattr->mattr.attr.owner = mod; | |
1035 | sattr->mattr.attr.mode = S_IRUGO; | |
1036 | *(gattr++) = &(sattr++)->mattr.attr; | |
1037 | } | |
1038 | *gattr = NULL; | |
1039 | ||
1040 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1041 | goto out; | |
1042 | ||
1043 | mod->sect_attrs = sect_attrs; | |
1044 | return; | |
1045 | out: | |
1046 | kfree(sect_attrs); | |
1047 | } | |
1048 | ||
1049 | static void remove_sect_attrs(struct module *mod) | |
1050 | { | |
1051 | if (mod->sect_attrs) { | |
1052 | sysfs_remove_group(&mod->mkobj.kobj, | |
1053 | &mod->sect_attrs->grp); | |
1054 | /* We are positive that no one is using any sect attrs | |
1055 | * at this point. Deallocate immediately. */ | |
1056 | kfree(mod->sect_attrs); | |
1057 | mod->sect_attrs = NULL; | |
1058 | } | |
1059 | } | |
1060 | ||
1061 | ||
1062 | #else | |
1063 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, | |
1064 | char *sectstrings, Elf_Shdr *sechdrs) | |
1065 | { | |
1066 | } | |
1067 | ||
1068 | static inline void remove_sect_attrs(struct module *mod) | |
1069 | { | |
1070 | } | |
1071 | #endif /* CONFIG_KALLSYMS */ | |
1072 | ||
1073 | ||
1074 | #ifdef CONFIG_MODULE_UNLOAD | |
1075 | static inline int module_add_refcnt_attr(struct module *mod) | |
1076 | { | |
1077 | return sysfs_create_file(&mod->mkobj.kobj, &refcnt.attr); | |
1078 | } | |
1079 | static void module_remove_refcnt_attr(struct module *mod) | |
1080 | { | |
1081 | return sysfs_remove_file(&mod->mkobj.kobj, &refcnt.attr); | |
1082 | } | |
1083 | #else | |
1084 | static inline int module_add_refcnt_attr(struct module *mod) | |
1085 | { | |
1086 | return 0; | |
1087 | } | |
1088 | static void module_remove_refcnt_attr(struct module *mod) | |
1089 | { | |
1090 | } | |
1091 | #endif | |
1092 | ||
c988d2b2 MD |
1093 | #ifdef CONFIG_MODULE_UNLOAD |
1094 | static int module_add_modinfo_attrs(struct module *mod) | |
1095 | { | |
1096 | struct module_attribute *attr; | |
1097 | int error = 0; | |
1098 | int i; | |
1099 | ||
1100 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { | |
1101 | if (!attr->test || | |
1102 | (attr->test && attr->test(mod))) | |
1103 | error = sysfs_create_file(&mod->mkobj.kobj,&attr->attr); | |
1104 | } | |
1105 | return error; | |
1106 | } | |
1107 | ||
1108 | static void module_remove_modinfo_attrs(struct module *mod) | |
1109 | { | |
1110 | struct module_attribute *attr; | |
1111 | int i; | |
1112 | ||
1113 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1114 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); | |
1115 | attr->free(mod); | |
1116 | } | |
1117 | } | |
1118 | #endif | |
1da177e4 LT |
1119 | |
1120 | static int mod_sysfs_setup(struct module *mod, | |
1121 | struct kernel_param *kparam, | |
1122 | unsigned int num_params) | |
1123 | { | |
1124 | int err; | |
1125 | ||
1126 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); | |
1127 | err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name); | |
1128 | if (err) | |
1129 | goto out; | |
1130 | kobj_set_kset_s(&mod->mkobj, module_subsys); | |
1131 | mod->mkobj.mod = mod; | |
1132 | err = kobject_register(&mod->mkobj.kobj); | |
1133 | if (err) | |
1134 | goto out; | |
1135 | ||
1136 | err = module_add_refcnt_attr(mod); | |
1137 | if (err) | |
1138 | goto out_unreg; | |
1139 | ||
1140 | err = module_param_sysfs_setup(mod, kparam, num_params); | |
1141 | if (err) | |
1142 | goto out_unreg; | |
1143 | ||
c988d2b2 MD |
1144 | #ifdef CONFIG_MODULE_UNLOAD |
1145 | err = module_add_modinfo_attrs(mod); | |
1146 | if (err) | |
1147 | goto out_unreg; | |
1148 | #endif | |
1149 | ||
1da177e4 LT |
1150 | return 0; |
1151 | ||
1152 | out_unreg: | |
1153 | kobject_unregister(&mod->mkobj.kobj); | |
1154 | out: | |
1155 | return err; | |
1156 | } | |
1157 | ||
1158 | static void mod_kobject_remove(struct module *mod) | |
1159 | { | |
c988d2b2 MD |
1160 | #ifdef CONFIG_MODULE_UNLOAD |
1161 | module_remove_modinfo_attrs(mod); | |
1162 | #endif | |
1da177e4 LT |
1163 | module_remove_refcnt_attr(mod); |
1164 | module_param_sysfs_remove(mod); | |
1165 | ||
1166 | kobject_unregister(&mod->mkobj.kobj); | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * unlink the module with the whole machine is stopped with interrupts off | |
1171 | * - this defends against kallsyms not taking locks | |
1172 | */ | |
1173 | static int __unlink_module(void *_mod) | |
1174 | { | |
1175 | struct module *mod = _mod; | |
1176 | list_del(&mod->list); | |
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | /* Free a module, remove from lists, etc (must hold module mutex). */ | |
1181 | static void free_module(struct module *mod) | |
1182 | { | |
1183 | /* Delete from various lists */ | |
1184 | stop_machine_run(__unlink_module, mod, NR_CPUS); | |
1185 | remove_sect_attrs(mod); | |
1186 | mod_kobject_remove(mod); | |
1187 | ||
1188 | /* Arch-specific cleanup. */ | |
1189 | module_arch_cleanup(mod); | |
1190 | ||
1191 | /* Module unload stuff */ | |
1192 | module_unload_free(mod); | |
1193 | ||
1194 | /* This may be NULL, but that's OK */ | |
1195 | module_free(mod, mod->module_init); | |
1196 | kfree(mod->args); | |
1197 | if (mod->percpu) | |
1198 | percpu_modfree(mod->percpu); | |
1199 | ||
1200 | /* Finally, free the core (containing the module structure) */ | |
1201 | module_free(mod, mod->module_core); | |
1202 | } | |
1203 | ||
1204 | void *__symbol_get(const char *symbol) | |
1205 | { | |
1206 | struct module *owner; | |
1207 | unsigned long value, flags; | |
1208 | const unsigned long *crc; | |
1209 | ||
1210 | spin_lock_irqsave(&modlist_lock, flags); | |
1211 | value = __find_symbol(symbol, &owner, &crc, 1); | |
1212 | if (value && !strong_try_module_get(owner)) | |
1213 | value = 0; | |
1214 | spin_unlock_irqrestore(&modlist_lock, flags); | |
1215 | ||
1216 | return (void *)value; | |
1217 | } | |
1218 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1219 | ||
eea8b54d AN |
1220 | /* |
1221 | * Ensure that an exported symbol [global namespace] does not already exist | |
1222 | * in the Kernel or in some other modules exported symbol table. | |
1223 | */ | |
1224 | static int verify_export_symbols(struct module *mod) | |
1225 | { | |
1226 | const char *name = NULL; | |
1227 | unsigned long i, ret = 0; | |
1228 | struct module *owner; | |
1229 | const unsigned long *crc; | |
1230 | ||
1231 | for (i = 0; i < mod->num_syms; i++) | |
1232 | if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) { | |
1233 | name = mod->syms[i].name; | |
1234 | ret = -ENOEXEC; | |
1235 | goto dup; | |
1236 | } | |
1237 | ||
1238 | for (i = 0; i < mod->num_gpl_syms; i++) | |
1239 | if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) { | |
1240 | name = mod->gpl_syms[i].name; | |
1241 | ret = -ENOEXEC; | |
1242 | goto dup; | |
1243 | } | |
1244 | ||
1245 | dup: | |
1246 | if (ret) | |
1247 | printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n", | |
1248 | mod->name, name, module_name(owner)); | |
1249 | ||
1250 | return ret; | |
1251 | } | |
1252 | ||
1da177e4 LT |
1253 | /* Change all symbols so that sh_value encodes the pointer directly. */ |
1254 | static int simplify_symbols(Elf_Shdr *sechdrs, | |
1255 | unsigned int symindex, | |
1256 | const char *strtab, | |
1257 | unsigned int versindex, | |
1258 | unsigned int pcpuindex, | |
1259 | struct module *mod) | |
1260 | { | |
1261 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1262 | unsigned long secbase; | |
1263 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1264 | int ret = 0; | |
1265 | ||
1266 | for (i = 1; i < n; i++) { | |
1267 | switch (sym[i].st_shndx) { | |
1268 | case SHN_COMMON: | |
1269 | /* We compiled with -fno-common. These are not | |
1270 | supposed to happen. */ | |
1271 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1272 | printk("%s: please compile with -fno-common\n", | |
1273 | mod->name); | |
1274 | ret = -ENOEXEC; | |
1275 | break; | |
1276 | ||
1277 | case SHN_ABS: | |
1278 | /* Don't need to do anything */ | |
1279 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1280 | (long)sym[i].st_value); | |
1281 | break; | |
1282 | ||
1283 | case SHN_UNDEF: | |
1284 | sym[i].st_value | |
1285 | = resolve_symbol(sechdrs, versindex, | |
1286 | strtab + sym[i].st_name, mod); | |
1287 | ||
1288 | /* Ok if resolved. */ | |
1289 | if (sym[i].st_value != 0) | |
1290 | break; | |
1291 | /* Ok if weak. */ | |
1292 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) | |
1293 | break; | |
1294 | ||
1295 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
1296 | mod->name, strtab + sym[i].st_name); | |
1297 | ret = -ENOENT; | |
1298 | break; | |
1299 | ||
1300 | default: | |
1301 | /* Divert to percpu allocation if a percpu var. */ | |
1302 | if (sym[i].st_shndx == pcpuindex) | |
1303 | secbase = (unsigned long)mod->percpu; | |
1304 | else | |
1305 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1306 | sym[i].st_value += secbase; | |
1307 | break; | |
1308 | } | |
1309 | } | |
1310 | ||
1311 | return ret; | |
1312 | } | |
1313 | ||
1314 | /* Update size with this section: return offset. */ | |
1315 | static long get_offset(unsigned long *size, Elf_Shdr *sechdr) | |
1316 | { | |
1317 | long ret; | |
1318 | ||
1319 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); | |
1320 | *size = ret + sechdr->sh_size; | |
1321 | return ret; | |
1322 | } | |
1323 | ||
1324 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1325 | might -- code, read-only data, read-write data, small data. Tally | |
1326 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1327 | belongs in init. */ | |
1328 | static void layout_sections(struct module *mod, | |
1329 | const Elf_Ehdr *hdr, | |
1330 | Elf_Shdr *sechdrs, | |
1331 | const char *secstrings) | |
1332 | { | |
1333 | static unsigned long const masks[][2] = { | |
1334 | /* NOTE: all executable code must be the first section | |
1335 | * in this array; otherwise modify the text_size | |
1336 | * finder in the two loops below */ | |
1337 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1338 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1339 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1340 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1341 | }; | |
1342 | unsigned int m, i; | |
1343 | ||
1344 | for (i = 0; i < hdr->e_shnum; i++) | |
1345 | sechdrs[i].sh_entsize = ~0UL; | |
1346 | ||
1347 | DEBUGP("Core section allocation order:\n"); | |
1348 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1349 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1350 | Elf_Shdr *s = &sechdrs[i]; | |
1351 | ||
1352 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1353 | || (s->sh_flags & masks[m][1]) | |
1354 | || s->sh_entsize != ~0UL | |
1355 | || strncmp(secstrings + s->sh_name, | |
1356 | ".init", 5) == 0) | |
1357 | continue; | |
1358 | s->sh_entsize = get_offset(&mod->core_size, s); | |
1359 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1360 | } | |
1361 | if (m == 0) | |
1362 | mod->core_text_size = mod->core_size; | |
1363 | } | |
1364 | ||
1365 | DEBUGP("Init section allocation order:\n"); | |
1366 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1367 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1368 | Elf_Shdr *s = &sechdrs[i]; | |
1369 | ||
1370 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1371 | || (s->sh_flags & masks[m][1]) | |
1372 | || s->sh_entsize != ~0UL | |
1373 | || strncmp(secstrings + s->sh_name, | |
1374 | ".init", 5) != 0) | |
1375 | continue; | |
1376 | s->sh_entsize = (get_offset(&mod->init_size, s) | |
1377 | | INIT_OFFSET_MASK); | |
1378 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1379 | } | |
1380 | if (m == 0) | |
1381 | mod->init_text_size = mod->init_size; | |
1382 | } | |
1383 | } | |
1384 | ||
1385 | static inline int license_is_gpl_compatible(const char *license) | |
1386 | { | |
1387 | return (strcmp(license, "GPL") == 0 | |
1388 | || strcmp(license, "GPL v2") == 0 | |
1389 | || strcmp(license, "GPL and additional rights") == 0 | |
1390 | || strcmp(license, "Dual BSD/GPL") == 0 | |
1391 | || strcmp(license, "Dual MPL/GPL") == 0); | |
1392 | } | |
1393 | ||
1394 | static void set_license(struct module *mod, const char *license) | |
1395 | { | |
1396 | if (!license) | |
1397 | license = "unspecified"; | |
1398 | ||
1399 | mod->license_gplok = license_is_gpl_compatible(license); | |
1400 | if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) { | |
1401 | printk(KERN_WARNING "%s: module license '%s' taints kernel.\n", | |
1402 | mod->name, license); | |
9f158333 | 1403 | add_taint(TAINT_PROPRIETARY_MODULE); |
1da177e4 LT |
1404 | } |
1405 | } | |
1406 | ||
1407 | /* Parse tag=value strings from .modinfo section */ | |
1408 | static char *next_string(char *string, unsigned long *secsize) | |
1409 | { | |
1410 | /* Skip non-zero chars */ | |
1411 | while (string[0]) { | |
1412 | string++; | |
1413 | if ((*secsize)-- <= 1) | |
1414 | return NULL; | |
1415 | } | |
1416 | ||
1417 | /* Skip any zero padding. */ | |
1418 | while (!string[0]) { | |
1419 | string++; | |
1420 | if ((*secsize)-- <= 1) | |
1421 | return NULL; | |
1422 | } | |
1423 | return string; | |
1424 | } | |
1425 | ||
1426 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1427 | unsigned int info, | |
1428 | const char *tag) | |
1429 | { | |
1430 | char *p; | |
1431 | unsigned int taglen = strlen(tag); | |
1432 | unsigned long size = sechdrs[info].sh_size; | |
1433 | ||
1434 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1435 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1436 | return p + taglen + 1; | |
1437 | } | |
1438 | return NULL; | |
1439 | } | |
1440 | ||
c988d2b2 MD |
1441 | #ifdef CONFIG_MODULE_UNLOAD |
1442 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, | |
1443 | unsigned int infoindex) | |
1444 | { | |
1445 | struct module_attribute *attr; | |
1446 | int i; | |
1447 | ||
1448 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1449 | if (attr->setup) | |
1450 | attr->setup(mod, | |
1451 | get_modinfo(sechdrs, | |
1452 | infoindex, | |
1453 | attr->attr.name)); | |
1454 | } | |
1455 | } | |
1456 | #endif | |
1457 | ||
1da177e4 LT |
1458 | #ifdef CONFIG_KALLSYMS |
1459 | int is_exported(const char *name, const struct module *mod) | |
1460 | { | |
3fd6805f SR |
1461 | if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) |
1462 | return 1; | |
1463 | else | |
1464 | if (lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) | |
1da177e4 | 1465 | return 1; |
3fd6805f SR |
1466 | else |
1467 | return 0; | |
1da177e4 LT |
1468 | } |
1469 | ||
1470 | /* As per nm */ | |
1471 | static char elf_type(const Elf_Sym *sym, | |
1472 | Elf_Shdr *sechdrs, | |
1473 | const char *secstrings, | |
1474 | struct module *mod) | |
1475 | { | |
1476 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1477 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1478 | return 'v'; | |
1479 | else | |
1480 | return 'w'; | |
1481 | } | |
1482 | if (sym->st_shndx == SHN_UNDEF) | |
1483 | return 'U'; | |
1484 | if (sym->st_shndx == SHN_ABS) | |
1485 | return 'a'; | |
1486 | if (sym->st_shndx >= SHN_LORESERVE) | |
1487 | return '?'; | |
1488 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1489 | return 't'; | |
1490 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1491 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1492 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1493 | return 'r'; | |
1494 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1495 | return 'g'; | |
1496 | else | |
1497 | return 'd'; | |
1498 | } | |
1499 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1500 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1501 | return 's'; | |
1502 | else | |
1503 | return 'b'; | |
1504 | } | |
1505 | if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, | |
1506 | ".debug", strlen(".debug")) == 0) | |
1507 | return 'n'; | |
1508 | return '?'; | |
1509 | } | |
1510 | ||
1511 | static void add_kallsyms(struct module *mod, | |
1512 | Elf_Shdr *sechdrs, | |
1513 | unsigned int symindex, | |
1514 | unsigned int strindex, | |
1515 | const char *secstrings) | |
1516 | { | |
1517 | unsigned int i; | |
1518 | ||
1519 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
1520 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1521 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
1522 | ||
1523 | /* Set types up while we still have access to sections. */ | |
1524 | for (i = 0; i < mod->num_symtab; i++) | |
1525 | mod->symtab[i].st_info | |
1526 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
1527 | } | |
1528 | #else | |
1529 | static inline void add_kallsyms(struct module *mod, | |
1530 | Elf_Shdr *sechdrs, | |
1531 | unsigned int symindex, | |
1532 | unsigned int strindex, | |
1533 | const char *secstrings) | |
1534 | { | |
1535 | } | |
1536 | #endif /* CONFIG_KALLSYMS */ | |
1537 | ||
1538 | /* Allocate and load the module: note that size of section 0 is always | |
1539 | zero, and we rely on this for optional sections. */ | |
1540 | static struct module *load_module(void __user *umod, | |
1541 | unsigned long len, | |
1542 | const char __user *uargs) | |
1543 | { | |
1544 | Elf_Ehdr *hdr; | |
1545 | Elf_Shdr *sechdrs; | |
1546 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
1547 | unsigned int i, symindex = 0, strindex = 0, setupindex, exindex, | |
1548 | exportindex, modindex, obsparmindex, infoindex, gplindex, | |
1549 | crcindex, gplcrcindex, versindex, pcpuindex; | |
1550 | long arglen; | |
1551 | struct module *mod; | |
1552 | long err = 0; | |
1553 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ | |
1554 | struct exception_table_entry *extable; | |
378bac82 | 1555 | mm_segment_t old_fs; |
1da177e4 LT |
1556 | |
1557 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
1558 | umod, len, uargs); | |
1559 | if (len < sizeof(*hdr)) | |
1560 | return ERR_PTR(-ENOEXEC); | |
1561 | ||
1562 | /* Suck in entire file: we'll want most of it. */ | |
1563 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
1564 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
1565 | return ERR_PTR(-ENOMEM); | |
1566 | if (copy_from_user(hdr, umod, len) != 0) { | |
1567 | err = -EFAULT; | |
1568 | goto free_hdr; | |
1569 | } | |
1570 | ||
1571 | /* Sanity checks against insmoding binaries or wrong arch, | |
1572 | weird elf version */ | |
1573 | if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 | |
1574 | || hdr->e_type != ET_REL | |
1575 | || !elf_check_arch(hdr) | |
1576 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
1577 | err = -ENOEXEC; | |
1578 | goto free_hdr; | |
1579 | } | |
1580 | ||
1581 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
1582 | goto truncated; | |
1583 | ||
1584 | /* Convenience variables */ | |
1585 | sechdrs = (void *)hdr + hdr->e_shoff; | |
1586 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
1587 | sechdrs[0].sh_addr = 0; | |
1588 | ||
1589 | for (i = 1; i < hdr->e_shnum; i++) { | |
1590 | if (sechdrs[i].sh_type != SHT_NOBITS | |
1591 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
1592 | goto truncated; | |
1593 | ||
1594 | /* Mark all sections sh_addr with their address in the | |
1595 | temporary image. */ | |
1596 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
1597 | ||
1598 | /* Internal symbols and strings. */ | |
1599 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
1600 | symindex = i; | |
1601 | strindex = sechdrs[i].sh_link; | |
1602 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
1603 | } | |
1604 | #ifndef CONFIG_MODULE_UNLOAD | |
1605 | /* Don't load .exit sections */ | |
1606 | if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) | |
1607 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1608 | #endif | |
1609 | } | |
1610 | ||
1611 | modindex = find_sec(hdr, sechdrs, secstrings, | |
1612 | ".gnu.linkonce.this_module"); | |
1613 | if (!modindex) { | |
1614 | printk(KERN_WARNING "No module found in object\n"); | |
1615 | err = -ENOEXEC; | |
1616 | goto free_hdr; | |
1617 | } | |
1618 | mod = (void *)sechdrs[modindex].sh_addr; | |
1619 | ||
1620 | if (symindex == 0) { | |
1621 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
1622 | mod->name); | |
1623 | err = -ENOEXEC; | |
1624 | goto free_hdr; | |
1625 | } | |
1626 | ||
1627 | /* Optional sections */ | |
1628 | exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); | |
1629 | gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); | |
1630 | crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); | |
1631 | gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
1632 | setupindex = find_sec(hdr, sechdrs, secstrings, "__param"); | |
1633 | exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table"); | |
1634 | obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm"); | |
1635 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); | |
1636 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
1637 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
1638 | ||
1639 | /* Don't keep modinfo section */ | |
1640 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1641 | #ifdef CONFIG_KALLSYMS | |
1642 | /* Keep symbol and string tables for decoding later. */ | |
1643 | sechdrs[symindex].sh_flags |= SHF_ALLOC; | |
1644 | sechdrs[strindex].sh_flags |= SHF_ALLOC; | |
1645 | #endif | |
1646 | ||
1647 | /* Check module struct version now, before we try to use module. */ | |
1648 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
1649 | err = -ENOEXEC; | |
1650 | goto free_hdr; | |
1651 | } | |
1652 | ||
1653 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
1654 | /* This is allowed: modprobe --force will invalidate it. */ | |
1655 | if (!modmagic) { | |
9f158333 | 1656 | add_taint(TAINT_FORCED_MODULE); |
1da177e4 LT |
1657 | printk(KERN_WARNING "%s: no version magic, tainting kernel.\n", |
1658 | mod->name); | |
1659 | } else if (!same_magic(modmagic, vermagic)) { | |
1660 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", | |
1661 | mod->name, modmagic, vermagic); | |
1662 | err = -ENOEXEC; | |
1663 | goto free_hdr; | |
1664 | } | |
1665 | ||
1666 | /* Now copy in args */ | |
1667 | arglen = strlen_user(uargs); | |
1668 | if (!arglen) { | |
1669 | err = -EFAULT; | |
1670 | goto free_hdr; | |
1671 | } | |
1672 | args = kmalloc(arglen, GFP_KERNEL); | |
1673 | if (!args) { | |
1674 | err = -ENOMEM; | |
1675 | goto free_hdr; | |
1676 | } | |
1677 | if (copy_from_user(args, uargs, arglen) != 0) { | |
1678 | err = -EFAULT; | |
1679 | goto free_mod; | |
1680 | } | |
1681 | ||
8e08b756 AM |
1682 | /* Userspace could have altered the string after the strlen_user() */ |
1683 | args[arglen - 1] = '\0'; | |
1684 | ||
1da177e4 LT |
1685 | if (find_module(mod->name)) { |
1686 | err = -EEXIST; | |
1687 | goto free_mod; | |
1688 | } | |
1689 | ||
1690 | mod->state = MODULE_STATE_COMING; | |
1691 | ||
1692 | /* Allow arches to frob section contents and sizes. */ | |
1693 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
1694 | if (err < 0) | |
1695 | goto free_mod; | |
1696 | ||
1697 | if (pcpuindex) { | |
1698 | /* We have a special allocation for this section. */ | |
1699 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, | |
842bbaaa RR |
1700 | sechdrs[pcpuindex].sh_addralign, |
1701 | mod->name); | |
1da177e4 LT |
1702 | if (!percpu) { |
1703 | err = -ENOMEM; | |
1704 | goto free_mod; | |
1705 | } | |
1706 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1707 | mod->percpu = percpu; | |
1708 | } | |
1709 | ||
1710 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
1711 | this is done generically; there doesn't appear to be any | |
1712 | special cases for the architectures. */ | |
1713 | layout_sections(mod, hdr, sechdrs, secstrings); | |
1714 | ||
1715 | /* Do the allocs. */ | |
1716 | ptr = module_alloc(mod->core_size); | |
1717 | if (!ptr) { | |
1718 | err = -ENOMEM; | |
1719 | goto free_percpu; | |
1720 | } | |
1721 | memset(ptr, 0, mod->core_size); | |
1722 | mod->module_core = ptr; | |
1723 | ||
1724 | ptr = module_alloc(mod->init_size); | |
1725 | if (!ptr && mod->init_size) { | |
1726 | err = -ENOMEM; | |
1727 | goto free_core; | |
1728 | } | |
1729 | memset(ptr, 0, mod->init_size); | |
1730 | mod->module_init = ptr; | |
1731 | ||
1732 | /* Transfer each section which specifies SHF_ALLOC */ | |
1733 | DEBUGP("final section addresses:\n"); | |
1734 | for (i = 0; i < hdr->e_shnum; i++) { | |
1735 | void *dest; | |
1736 | ||
1737 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1738 | continue; | |
1739 | ||
1740 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
1741 | dest = mod->module_init | |
1742 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
1743 | else | |
1744 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
1745 | ||
1746 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
1747 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
1748 | sechdrs[i].sh_size); | |
1749 | /* Update sh_addr to point to copy in image. */ | |
1750 | sechdrs[i].sh_addr = (unsigned long)dest; | |
1751 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
1752 | } | |
1753 | /* Module has been moved. */ | |
1754 | mod = (void *)sechdrs[modindex].sh_addr; | |
1755 | ||
1756 | /* Now we've moved module, initialize linked lists, etc. */ | |
1757 | module_unload_init(mod); | |
1758 | ||
1759 | /* Set up license info based on the info section */ | |
1760 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
1761 | ||
9841d61d DJ |
1762 | if (strcmp(mod->name, "ndiswrapper") == 0) |
1763 | add_taint(TAINT_PROPRIETARY_MODULE); | |
1764 | if (strcmp(mod->name, "driverloader") == 0) | |
1765 | add_taint(TAINT_PROPRIETARY_MODULE); | |
1766 | ||
c988d2b2 MD |
1767 | #ifdef CONFIG_MODULE_UNLOAD |
1768 | /* Set up MODINFO_ATTR fields */ | |
1769 | setup_modinfo(mod, sechdrs, infoindex); | |
1770 | #endif | |
1771 | ||
1da177e4 LT |
1772 | /* Fix up syms, so that st_value is a pointer to location. */ |
1773 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
1774 | mod); | |
1775 | if (err < 0) | |
1776 | goto cleanup; | |
1777 | ||
1778 | /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ | |
1779 | mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms); | |
1780 | mod->syms = (void *)sechdrs[exportindex].sh_addr; | |
1781 | if (crcindex) | |
1782 | mod->crcs = (void *)sechdrs[crcindex].sh_addr; | |
1783 | mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms); | |
1784 | mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr; | |
1785 | if (gplcrcindex) | |
1786 | mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr; | |
1787 | ||
1788 | #ifdef CONFIG_MODVERSIONS | |
1789 | if ((mod->num_syms && !crcindex) || | |
1790 | (mod->num_gpl_syms && !gplcrcindex)) { | |
1791 | printk(KERN_WARNING "%s: No versions for exported symbols." | |
1792 | " Tainting kernel.\n", mod->name); | |
9f158333 | 1793 | add_taint(TAINT_FORCED_MODULE); |
1da177e4 LT |
1794 | } |
1795 | #endif | |
1796 | ||
1797 | /* Now do relocations. */ | |
1798 | for (i = 1; i < hdr->e_shnum; i++) { | |
1799 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
1800 | unsigned int info = sechdrs[i].sh_info; | |
1801 | ||
1802 | /* Not a valid relocation section? */ | |
1803 | if (info >= hdr->e_shnum) | |
1804 | continue; | |
1805 | ||
1806 | /* Don't bother with non-allocated sections */ | |
1807 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
1808 | continue; | |
1809 | ||
1810 | if (sechdrs[i].sh_type == SHT_REL) | |
1811 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
1812 | else if (sechdrs[i].sh_type == SHT_RELA) | |
1813 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
1814 | mod); | |
1815 | if (err < 0) | |
1816 | goto cleanup; | |
1817 | } | |
1818 | ||
eea8b54d AN |
1819 | /* Find duplicate symbols */ |
1820 | err = verify_export_symbols(mod); | |
1821 | ||
1822 | if (err < 0) | |
1823 | goto cleanup; | |
1824 | ||
1da177e4 LT |
1825 | /* Set up and sort exception table */ |
1826 | mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable); | |
1827 | mod->extable = extable = (void *)sechdrs[exindex].sh_addr; | |
1828 | sort_extable(extable, extable + mod->num_exentries); | |
1829 | ||
1830 | /* Finally, copy percpu area over. */ | |
1831 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, | |
1832 | sechdrs[pcpuindex].sh_size); | |
1833 | ||
1834 | add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); | |
1835 | ||
1836 | err = module_finalize(hdr, sechdrs, mod); | |
1837 | if (err < 0) | |
1838 | goto cleanup; | |
1839 | ||
378bac82 TK |
1840 | /* flush the icache in correct context */ |
1841 | old_fs = get_fs(); | |
1842 | set_fs(KERNEL_DS); | |
1843 | ||
1844 | /* | |
1845 | * Flush the instruction cache, since we've played with text. | |
1846 | * Do it before processing of module parameters, so the module | |
1847 | * can provide parameter accessor functions of its own. | |
1848 | */ | |
1849 | if (mod->module_init) | |
1850 | flush_icache_range((unsigned long)mod->module_init, | |
1851 | (unsigned long)mod->module_init | |
1852 | + mod->init_size); | |
1853 | flush_icache_range((unsigned long)mod->module_core, | |
1854 | (unsigned long)mod->module_core + mod->core_size); | |
1855 | ||
1856 | set_fs(old_fs); | |
1857 | ||
1da177e4 LT |
1858 | mod->args = args; |
1859 | if (obsparmindex) { | |
1860 | err = obsolete_params(mod->name, mod->args, | |
1861 | (struct obsolete_modparm *) | |
1862 | sechdrs[obsparmindex].sh_addr, | |
1863 | sechdrs[obsparmindex].sh_size | |
1864 | / sizeof(struct obsolete_modparm), | |
1865 | sechdrs, symindex, | |
1866 | (char *)sechdrs[strindex].sh_addr); | |
1867 | if (setupindex) | |
1868 | printk(KERN_WARNING "%s: Ignoring new-style " | |
1869 | "parameters in presence of obsolete ones\n", | |
1870 | mod->name); | |
1871 | } else { | |
1872 | /* Size of section 0 is 0, so this works well if no params */ | |
1873 | err = parse_args(mod->name, mod->args, | |
1874 | (struct kernel_param *) | |
1875 | sechdrs[setupindex].sh_addr, | |
1876 | sechdrs[setupindex].sh_size | |
1877 | / sizeof(struct kernel_param), | |
1878 | NULL); | |
1879 | } | |
1880 | if (err < 0) | |
1881 | goto arch_cleanup; | |
1882 | ||
1883 | err = mod_sysfs_setup(mod, | |
1884 | (struct kernel_param *) | |
1885 | sechdrs[setupindex].sh_addr, | |
1886 | sechdrs[setupindex].sh_size | |
1887 | / sizeof(struct kernel_param)); | |
1888 | if (err < 0) | |
1889 | goto arch_cleanup; | |
1890 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); | |
1891 | ||
1892 | /* Get rid of temporary copy */ | |
1893 | vfree(hdr); | |
1894 | ||
1895 | /* Done! */ | |
1896 | return mod; | |
1897 | ||
1898 | arch_cleanup: | |
1899 | module_arch_cleanup(mod); | |
1900 | cleanup: | |
1901 | module_unload_free(mod); | |
1902 | module_free(mod, mod->module_init); | |
1903 | free_core: | |
1904 | module_free(mod, mod->module_core); | |
1905 | free_percpu: | |
1906 | if (percpu) | |
1907 | percpu_modfree(percpu); | |
1908 | free_mod: | |
1909 | kfree(args); | |
1910 | free_hdr: | |
1911 | vfree(hdr); | |
6fe2e70b | 1912 | return ERR_PTR(err); |
1da177e4 LT |
1913 | |
1914 | truncated: | |
1915 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
1916 | err = -ENOEXEC; | |
1917 | goto free_hdr; | |
1918 | } | |
1919 | ||
1920 | /* | |
1921 | * link the module with the whole machine is stopped with interrupts off | |
1922 | * - this defends against kallsyms not taking locks | |
1923 | */ | |
1924 | static int __link_module(void *_mod) | |
1925 | { | |
1926 | struct module *mod = _mod; | |
1927 | list_add(&mod->list, &modules); | |
1928 | return 0; | |
1929 | } | |
1930 | ||
1931 | /* This is where the real work happens */ | |
1932 | asmlinkage long | |
1933 | sys_init_module(void __user *umod, | |
1934 | unsigned long len, | |
1935 | const char __user *uargs) | |
1936 | { | |
1937 | struct module *mod; | |
1938 | int ret = 0; | |
1939 | ||
1940 | /* Must have permission */ | |
1941 | if (!capable(CAP_SYS_MODULE)) | |
1942 | return -EPERM; | |
1943 | ||
1944 | /* Only one module load at a time, please */ | |
1945 | if (down_interruptible(&module_mutex) != 0) | |
1946 | return -EINTR; | |
1947 | ||
1948 | /* Do all the hard work */ | |
1949 | mod = load_module(umod, len, uargs); | |
1950 | if (IS_ERR(mod)) { | |
1951 | up(&module_mutex); | |
1952 | return PTR_ERR(mod); | |
1953 | } | |
1954 | ||
1da177e4 LT |
1955 | /* Now sew it into the lists. They won't access us, since |
1956 | strong_try_module_get() will fail. */ | |
1957 | stop_machine_run(__link_module, mod, NR_CPUS); | |
1958 | ||
1959 | /* Drop lock so they can recurse */ | |
1960 | up(&module_mutex); | |
1961 | ||
1962 | down(¬ify_mutex); | |
1963 | notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod); | |
1964 | up(¬ify_mutex); | |
1965 | ||
1966 | /* Start the module */ | |
1967 | if (mod->init != NULL) | |
1968 | ret = mod->init(); | |
1969 | if (ret < 0) { | |
1970 | /* Init routine failed: abort. Try to protect us from | |
1971 | buggy refcounters. */ | |
1972 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 1973 | synchronize_sched(); |
1da177e4 LT |
1974 | if (mod->unsafe) |
1975 | printk(KERN_ERR "%s: module is now stuck!\n", | |
1976 | mod->name); | |
1977 | else { | |
1978 | module_put(mod); | |
1979 | down(&module_mutex); | |
1980 | free_module(mod); | |
1981 | up(&module_mutex); | |
1982 | } | |
1983 | return ret; | |
1984 | } | |
1985 | ||
1986 | /* Now it's a first class citizen! */ | |
1987 | down(&module_mutex); | |
1988 | mod->state = MODULE_STATE_LIVE; | |
1989 | /* Drop initial reference. */ | |
1990 | module_put(mod); | |
1991 | module_free(mod, mod->module_init); | |
1992 | mod->module_init = NULL; | |
1993 | mod->init_size = 0; | |
1994 | mod->init_text_size = 0; | |
1995 | up(&module_mutex); | |
1996 | ||
1997 | return 0; | |
1998 | } | |
1999 | ||
2000 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2001 | { | |
2002 | return ((void *)addr >= start && (void *)addr < start + size); | |
2003 | } | |
2004 | ||
2005 | #ifdef CONFIG_KALLSYMS | |
2006 | /* | |
2007 | * This ignores the intensely annoying "mapping symbols" found | |
2008 | * in ARM ELF files: $a, $t and $d. | |
2009 | */ | |
2010 | static inline int is_arm_mapping_symbol(const char *str) | |
2011 | { | |
2012 | return str[0] == '$' && strchr("atd", str[1]) | |
2013 | && (str[2] == '\0' || str[2] == '.'); | |
2014 | } | |
2015 | ||
2016 | static const char *get_ksymbol(struct module *mod, | |
2017 | unsigned long addr, | |
2018 | unsigned long *size, | |
2019 | unsigned long *offset) | |
2020 | { | |
2021 | unsigned int i, best = 0; | |
2022 | unsigned long nextval; | |
2023 | ||
2024 | /* At worse, next value is at end of module */ | |
2025 | if (within(addr, mod->module_init, mod->init_size)) | |
2026 | nextval = (unsigned long)mod->module_init+mod->init_text_size; | |
2027 | else | |
2028 | nextval = (unsigned long)mod->module_core+mod->core_text_size; | |
2029 | ||
2030 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
2031 | starts real symbols at 1). */ | |
2032 | for (i = 1; i < mod->num_symtab; i++) { | |
2033 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2034 | continue; | |
2035 | ||
2036 | /* We ignore unnamed symbols: they're uninformative | |
2037 | * and inserted at a whim. */ | |
2038 | if (mod->symtab[i].st_value <= addr | |
2039 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2040 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2041 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2042 | best = i; | |
2043 | if (mod->symtab[i].st_value > addr | |
2044 | && mod->symtab[i].st_value < nextval | |
2045 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2046 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2047 | nextval = mod->symtab[i].st_value; | |
2048 | } | |
2049 | ||
2050 | if (!best) | |
2051 | return NULL; | |
2052 | ||
2053 | *size = nextval - mod->symtab[best].st_value; | |
2054 | *offset = addr - mod->symtab[best].st_value; | |
2055 | return mod->strtab + mod->symtab[best].st_name; | |
2056 | } | |
2057 | ||
2058 | /* For kallsyms to ask for address resolution. NULL means not found. | |
2059 | We don't lock, as this is used for oops resolution and races are a | |
2060 | lesser concern. */ | |
2061 | const char *module_address_lookup(unsigned long addr, | |
2062 | unsigned long *size, | |
2063 | unsigned long *offset, | |
2064 | char **modname) | |
2065 | { | |
2066 | struct module *mod; | |
2067 | ||
2068 | list_for_each_entry(mod, &modules, list) { | |
2069 | if (within(addr, mod->module_init, mod->init_size) | |
2070 | || within(addr, mod->module_core, mod->core_size)) { | |
2071 | *modname = mod->name; | |
2072 | return get_ksymbol(mod, addr, size, offset); | |
2073 | } | |
2074 | } | |
2075 | return NULL; | |
2076 | } | |
2077 | ||
2078 | struct module *module_get_kallsym(unsigned int symnum, | |
2079 | unsigned long *value, | |
2080 | char *type, | |
2081 | char namebuf[128]) | |
2082 | { | |
2083 | struct module *mod; | |
2084 | ||
2085 | down(&module_mutex); | |
2086 | list_for_each_entry(mod, &modules, list) { | |
2087 | if (symnum < mod->num_symtab) { | |
2088 | *value = mod->symtab[symnum].st_value; | |
2089 | *type = mod->symtab[symnum].st_info; | |
2090 | strncpy(namebuf, | |
2091 | mod->strtab + mod->symtab[symnum].st_name, | |
2092 | 127); | |
2093 | up(&module_mutex); | |
2094 | return mod; | |
2095 | } | |
2096 | symnum -= mod->num_symtab; | |
2097 | } | |
2098 | up(&module_mutex); | |
2099 | return NULL; | |
2100 | } | |
2101 | ||
2102 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2103 | { | |
2104 | unsigned int i; | |
2105 | ||
2106 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2107 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2108 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2109 | return mod->symtab[i].st_value; |
2110 | return 0; | |
2111 | } | |
2112 | ||
2113 | /* Look for this name: can be of form module:name. */ | |
2114 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2115 | { | |
2116 | struct module *mod; | |
2117 | char *colon; | |
2118 | unsigned long ret = 0; | |
2119 | ||
2120 | /* Don't lock: we're in enough trouble already. */ | |
2121 | if ((colon = strchr(name, ':')) != NULL) { | |
2122 | *colon = '\0'; | |
2123 | if ((mod = find_module(name)) != NULL) | |
2124 | ret = mod_find_symname(mod, colon+1); | |
2125 | *colon = ':'; | |
2126 | } else { | |
2127 | list_for_each_entry(mod, &modules, list) | |
2128 | if ((ret = mod_find_symname(mod, name)) != 0) | |
2129 | break; | |
2130 | } | |
2131 | return ret; | |
2132 | } | |
2133 | #endif /* CONFIG_KALLSYMS */ | |
2134 | ||
2135 | /* Called by the /proc file system to return a list of modules. */ | |
2136 | static void *m_start(struct seq_file *m, loff_t *pos) | |
2137 | { | |
2138 | struct list_head *i; | |
2139 | loff_t n = 0; | |
2140 | ||
2141 | down(&module_mutex); | |
2142 | list_for_each(i, &modules) { | |
2143 | if (n++ == *pos) | |
2144 | break; | |
2145 | } | |
2146 | if (i == &modules) | |
2147 | return NULL; | |
2148 | return i; | |
2149 | } | |
2150 | ||
2151 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
2152 | { | |
2153 | struct list_head *i = p; | |
2154 | (*pos)++; | |
2155 | if (i->next == &modules) | |
2156 | return NULL; | |
2157 | return i->next; | |
2158 | } | |
2159 | ||
2160 | static void m_stop(struct seq_file *m, void *p) | |
2161 | { | |
2162 | up(&module_mutex); | |
2163 | } | |
2164 | ||
2165 | static int m_show(struct seq_file *m, void *p) | |
2166 | { | |
2167 | struct module *mod = list_entry(p, struct module, list); | |
2168 | seq_printf(m, "%s %lu", | |
2169 | mod->name, mod->init_size + mod->core_size); | |
2170 | print_unload_info(m, mod); | |
2171 | ||
2172 | /* Informative for users. */ | |
2173 | seq_printf(m, " %s", | |
2174 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2175 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2176 | "Live"); | |
2177 | /* Used by oprofile and other similar tools. */ | |
2178 | seq_printf(m, " 0x%p", mod->module_core); | |
2179 | ||
2180 | seq_printf(m, "\n"); | |
2181 | return 0; | |
2182 | } | |
2183 | ||
2184 | /* Format: modulename size refcount deps address | |
2185 | ||
2186 | Where refcount is a number or -, and deps is a comma-separated list | |
2187 | of depends or -. | |
2188 | */ | |
2189 | struct seq_operations modules_op = { | |
2190 | .start = m_start, | |
2191 | .next = m_next, | |
2192 | .stop = m_stop, | |
2193 | .show = m_show | |
2194 | }; | |
2195 | ||
2196 | /* Given an address, look for it in the module exception tables. */ | |
2197 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2198 | { | |
2199 | unsigned long flags; | |
2200 | const struct exception_table_entry *e = NULL; | |
2201 | struct module *mod; | |
2202 | ||
2203 | spin_lock_irqsave(&modlist_lock, flags); | |
2204 | list_for_each_entry(mod, &modules, list) { | |
2205 | if (mod->num_exentries == 0) | |
2206 | continue; | |
2207 | ||
2208 | e = search_extable(mod->extable, | |
2209 | mod->extable + mod->num_exentries - 1, | |
2210 | addr); | |
2211 | if (e) | |
2212 | break; | |
2213 | } | |
2214 | spin_unlock_irqrestore(&modlist_lock, flags); | |
2215 | ||
2216 | /* Now, if we found one, we are running inside it now, hence | |
2217 | we cannot unload the module, hence no refcnt needed. */ | |
2218 | return e; | |
2219 | } | |
2220 | ||
2221 | /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */ | |
2222 | struct module *__module_text_address(unsigned long addr) | |
2223 | { | |
2224 | struct module *mod; | |
2225 | ||
2226 | list_for_each_entry(mod, &modules, list) | |
2227 | if (within(addr, mod->module_init, mod->init_text_size) | |
2228 | || within(addr, mod->module_core, mod->core_text_size)) | |
2229 | return mod; | |
2230 | return NULL; | |
2231 | } | |
2232 | ||
2233 | struct module *module_text_address(unsigned long addr) | |
2234 | { | |
2235 | struct module *mod; | |
2236 | unsigned long flags; | |
2237 | ||
2238 | spin_lock_irqsave(&modlist_lock, flags); | |
2239 | mod = __module_text_address(addr); | |
2240 | spin_unlock_irqrestore(&modlist_lock, flags); | |
2241 | ||
2242 | return mod; | |
2243 | } | |
2244 | ||
2245 | /* Don't grab lock, we're oopsing. */ | |
2246 | void print_modules(void) | |
2247 | { | |
2248 | struct module *mod; | |
2249 | ||
2250 | printk("Modules linked in:"); | |
2251 | list_for_each_entry(mod, &modules, list) | |
2252 | printk(" %s", mod->name); | |
2253 | printk("\n"); | |
2254 | } | |
2255 | ||
2256 | void module_add_driver(struct module *mod, struct device_driver *drv) | |
2257 | { | |
2258 | if (!mod || !drv) | |
2259 | return; | |
2260 | ||
2261 | /* Don't check return code; this call is idempotent */ | |
2262 | sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module"); | |
2263 | } | |
2264 | EXPORT_SYMBOL(module_add_driver); | |
2265 | ||
2266 | void module_remove_driver(struct device_driver *drv) | |
2267 | { | |
2268 | if (!drv) | |
2269 | return; | |
2270 | sysfs_remove_link(&drv->kobj, "module"); | |
2271 | } | |
2272 | EXPORT_SYMBOL(module_remove_driver); | |
2273 | ||
2274 | #ifdef CONFIG_MODVERSIONS | |
2275 | /* Generate the signature for struct module here, too, for modversions. */ | |
2276 | void struct_module(struct module *mod) { return; } | |
2277 | EXPORT_SYMBOL(struct_module); | |
2278 | #endif |