blob: f0166563c602f12aba2867b60965959bfb57f6a7 [file] [log] [blame]
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 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*/
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
20#include <linux/moduleloader.h>
21#include <linux/init.h>
Randy Dunlap9f158332005-09-13 01:25:16 -070022#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/slab.h>
24#include <linux/vmalloc.h>
25#include <linux/elf.h>
26#include <linux/seq_file.h>
27#include <linux/syscalls.h>
28#include <linux/fcntl.h>
29#include <linux/rcupdate.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080030#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/cpu.h>
32#include <linux/moduleparam.h>
33#include <linux/errno.h>
34#include <linux/err.h>
35#include <linux/vermagic.h>
36#include <linux/notifier.h>
37#include <linux/stop_machine.h>
38#include <linux/device.h>
Matt Domschc988d2b2005-06-23 22:05:15 -070039#include <linux/string.h>
Tim Schmielau8c65b4a2005-11-07 00:59:43 -080040#include <linux/sched.h>
Arjan van de Ven97d1f152006-03-23 03:00:24 -080041#include <linux/mutex.h>
Jan Beulich4552d5d2006-06-26 13:57:28 +020042#include <linux/unwind.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <asm/uaccess.h>
44#include <asm/semaphore.h>
45#include <asm/cacheflush.h>
Sam Ravnborgb817f6f2006-06-09 21:53:55 +020046#include <linux/license.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#if 0
49#define DEBUGP printk
50#else
51#define DEBUGP(fmt , a...)
52#endif
53
54#ifndef ARCH_SHF_SMALL
55#define ARCH_SHF_SMALL 0
56#endif
57
58/* If this is set, the section belongs in the init part of the module */
59#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
60
61/* Protects module list */
62static DEFINE_SPINLOCK(modlist_lock);
63
64/* List of modules, protected by module_mutex AND modlist_lock */
Ashutosh Naik6389a382006-03-23 03:00:46 -080065static DEFINE_MUTEX(module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066static LIST_HEAD(modules);
67
Alan Sterne041c682006-03-27 01:16:30 -080068static BLOCKING_NOTIFIER_HEAD(module_notify_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70int register_module_notifier(struct notifier_block * nb)
71{
Alan Sterne041c682006-03-27 01:16:30 -080072 return blocking_notifier_chain_register(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073}
74EXPORT_SYMBOL(register_module_notifier);
75
76int unregister_module_notifier(struct notifier_block * nb)
77{
Alan Sterne041c682006-03-27 01:16:30 -080078 return blocking_notifier_chain_unregister(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079}
80EXPORT_SYMBOL(unregister_module_notifier);
81
82/* We require a truly strong try_module_get() */
83static inline int strong_try_module_get(struct module *mod)
84{
85 if (mod && mod->state == MODULE_STATE_COMING)
86 return 0;
87 return try_module_get(mod);
88}
89
Florin Malitafa3ba2e82006-10-11 01:21:48 -070090static inline void add_taint_module(struct module *mod, unsigned flag)
91{
92 add_taint(flag);
93 mod->taints |= flag;
94}
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/* A thread that wants to hold a reference to a module only while it
97 * is running can call ths to safely exit.
98 * nfsd and lockd use this.
99 */
100void __module_put_and_exit(struct module *mod, long code)
101{
102 module_put(mod);
103 do_exit(code);
104}
105EXPORT_SYMBOL(__module_put_and_exit);
106
107/* Find a module section: 0 means not found. */
108static unsigned int find_sec(Elf_Ehdr *hdr,
109 Elf_Shdr *sechdrs,
110 const char *secstrings,
111 const char *name)
112{
113 unsigned int i;
114
115 for (i = 1; i < hdr->e_shnum; i++)
116 /* Alloc bit cleared means "ignore it." */
117 if ((sechdrs[i].sh_flags & SHF_ALLOC)
118 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
119 return i;
120 return 0;
121}
122
123/* Provided by the linker */
124extern const struct kernel_symbol __start___ksymtab[];
125extern const struct kernel_symbol __stop___ksymtab[];
126extern const struct kernel_symbol __start___ksymtab_gpl[];
127extern const struct kernel_symbol __stop___ksymtab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800128extern const struct kernel_symbol __start___ksymtab_gpl_future[];
129extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700130extern const struct kernel_symbol __start___ksymtab_unused[];
131extern const struct kernel_symbol __stop___ksymtab_unused[];
132extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
133extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
134extern const struct kernel_symbol __start___ksymtab_gpl_future[];
135extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136extern const unsigned long __start___kcrctab[];
137extern const unsigned long __start___kcrctab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800138extern const unsigned long __start___kcrctab_gpl_future[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700139extern const unsigned long __start___kcrctab_unused[];
140extern const unsigned long __start___kcrctab_unused_gpl[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142#ifndef CONFIG_MODVERSIONS
143#define symversion(base, idx) NULL
144#else
Andrew Mortonf83ca9f2006-03-28 01:56:20 -0800145#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146#endif
147
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100148/* lookup symbol in given range of kernel_symbols */
149static const struct kernel_symbol *lookup_symbol(const char *name,
150 const struct kernel_symbol *start,
151 const struct kernel_symbol *stop)
152{
153 const struct kernel_symbol *ks = start;
154 for (; ks < stop; ks++)
155 if (strcmp(ks->name, name) == 0)
156 return ks;
157 return NULL;
158}
159
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700160static void printk_unused_warning(const char *name)
161{
162 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
163 "however this module is using it.\n", name);
164 printk(KERN_WARNING "This symbol will go away in the future.\n");
165 printk(KERN_WARNING "Please evalute if this is the right api to use, "
166 "and if it really is, submit a report the linux kernel "
167 "mailinglist together with submitting your code for "
168 "inclusion.\n");
169}
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171/* Find a symbol, return value, crc and module which owns it */
172static unsigned long __find_symbol(const char *name,
173 struct module **owner,
174 const unsigned long **crc,
175 int gplok)
176{
177 struct module *mod;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100178 const struct kernel_symbol *ks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 /* Core kernel first. */
181 *owner = NULL;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100182 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
183 if (ks) {
184 *crc = symversion(__start___kcrctab, (ks - __start___ksymtab));
185 return ks->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
187 if (gplok) {
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100188 ks = lookup_symbol(name, __start___ksymtab_gpl,
189 __stop___ksymtab_gpl);
190 if (ks) {
191 *crc = symversion(__start___kcrctab_gpl,
192 (ks - __start___ksymtab_gpl));
193 return ks->value;
194 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 }
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800196 ks = lookup_symbol(name, __start___ksymtab_gpl_future,
197 __stop___ksymtab_gpl_future);
198 if (ks) {
199 if (!gplok) {
200 printk(KERN_WARNING "Symbol %s is being used "
201 "by a non-GPL module, which will not "
202 "be allowed in the future\n", name);
203 printk(KERN_WARNING "Please see the file "
204 "Documentation/feature-removal-schedule.txt "
205 "in the kernel source tree for more "
206 "details.\n");
207 }
208 *crc = symversion(__start___kcrctab_gpl_future,
209 (ks - __start___ksymtab_gpl_future));
210 return ks->value;
211 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700213 ks = lookup_symbol(name, __start___ksymtab_unused,
214 __stop___ksymtab_unused);
215 if (ks) {
216 printk_unused_warning(name);
217 *crc = symversion(__start___kcrctab_unused,
218 (ks - __start___ksymtab_unused));
219 return ks->value;
220 }
221
222 if (gplok)
223 ks = lookup_symbol(name, __start___ksymtab_unused_gpl,
224 __stop___ksymtab_unused_gpl);
225 if (ks) {
226 printk_unused_warning(name);
227 *crc = symversion(__start___kcrctab_unused_gpl,
228 (ks - __start___ksymtab_unused_gpl));
229 return ks->value;
230 }
231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 /* Now try modules. */
233 list_for_each_entry(mod, &modules, list) {
234 *owner = mod;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100235 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
236 if (ks) {
237 *crc = symversion(mod->crcs, (ks - mod->syms));
238 return ks->value;
239 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 if (gplok) {
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100242 ks = lookup_symbol(name, mod->gpl_syms,
243 mod->gpl_syms + mod->num_gpl_syms);
244 if (ks) {
245 *crc = symversion(mod->gpl_crcs,
246 (ks - mod->gpl_syms));
247 return ks->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 }
249 }
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700250 ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms);
251 if (ks) {
252 printk_unused_warning(name);
253 *crc = symversion(mod->unused_crcs, (ks - mod->unused_syms));
254 return ks->value;
255 }
256
257 if (gplok) {
258 ks = lookup_symbol(name, mod->unused_gpl_syms,
259 mod->unused_gpl_syms + mod->num_unused_gpl_syms);
260 if (ks) {
261 printk_unused_warning(name);
262 *crc = symversion(mod->unused_gpl_crcs,
263 (ks - mod->unused_gpl_syms));
264 return ks->value;
265 }
266 }
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800267 ks = lookup_symbol(name, mod->gpl_future_syms,
268 (mod->gpl_future_syms +
269 mod->num_gpl_future_syms));
270 if (ks) {
271 if (!gplok) {
272 printk(KERN_WARNING "Symbol %s is being used "
273 "by a non-GPL module, which will not "
274 "be allowed in the future\n", name);
275 printk(KERN_WARNING "Please see the file "
276 "Documentation/feature-removal-schedule.txt "
277 "in the kernel source tree for more "
278 "details.\n");
279 }
280 *crc = symversion(mod->gpl_future_crcs,
281 (ks - mod->gpl_future_syms));
282 return ks->value;
283 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 }
285 DEBUGP("Failed to find symbol %s\n", name);
286 return 0;
287}
288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289/* Search for module by name: must hold module_mutex. */
290static struct module *find_module(const char *name)
291{
292 struct module *mod;
293
294 list_for_each_entry(mod, &modules, list) {
295 if (strcmp(mod->name, name) == 0)
296 return mod;
297 }
298 return NULL;
299}
300
301#ifdef CONFIG_SMP
302/* Number of blocks used and allocated. */
303static unsigned int pcpu_num_used, pcpu_num_allocated;
304/* Size of each block. -ve means used. */
305static int *pcpu_size;
306
307static int split_block(unsigned int i, unsigned short size)
308{
309 /* Reallocation required? */
310 if (pcpu_num_used + 1 > pcpu_num_allocated) {
311 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2,
312 GFP_KERNEL);
313 if (!new)
314 return 0;
315
316 memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated);
317 pcpu_num_allocated *= 2;
318 kfree(pcpu_size);
319 pcpu_size = new;
320 }
321
322 /* Insert a new subblock */
323 memmove(&pcpu_size[i+1], &pcpu_size[i],
324 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
325 pcpu_num_used++;
326
327 pcpu_size[i+1] -= size;
328 pcpu_size[i] = size;
329 return 1;
330}
331
332static inline unsigned int block_size(int val)
333{
334 if (val < 0)
335 return -val;
336 return val;
337}
338
339/* Created by linker magic */
340extern char __per_cpu_start[], __per_cpu_end[];
341
Rusty Russell842bbaa2005-08-01 21:11:47 -0700342static void *percpu_modalloc(unsigned long size, unsigned long align,
343 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
345 unsigned long extra;
346 unsigned int i;
347 void *ptr;
348
Rusty Russell842bbaa2005-08-01 21:11:47 -0700349 if (align > SMP_CACHE_BYTES) {
350 printk(KERN_WARNING "%s: per-cpu alignment %li > %i\n",
351 name, align, SMP_CACHE_BYTES);
352 align = SMP_CACHE_BYTES;
353 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 ptr = __per_cpu_start;
356 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
357 /* Extra for alignment requirement. */
358 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
359 BUG_ON(i == 0 && extra != 0);
360
361 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
362 continue;
363
364 /* Transfer extra to previous block. */
365 if (pcpu_size[i-1] < 0)
366 pcpu_size[i-1] -= extra;
367 else
368 pcpu_size[i-1] += extra;
369 pcpu_size[i] -= extra;
370 ptr += extra;
371
372 /* Split block if warranted */
373 if (pcpu_size[i] - size > sizeof(unsigned long))
374 if (!split_block(i, size))
375 return NULL;
376
377 /* Mark allocated */
378 pcpu_size[i] = -pcpu_size[i];
379 return ptr;
380 }
381
382 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
383 size);
384 return NULL;
385}
386
387static void percpu_modfree(void *freeme)
388{
389 unsigned int i;
390 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
391
392 /* First entry is core kernel percpu data. */
393 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
394 if (ptr == freeme) {
395 pcpu_size[i] = -pcpu_size[i];
396 goto free;
397 }
398 }
399 BUG();
400
401 free:
402 /* Merge with previous? */
403 if (pcpu_size[i-1] >= 0) {
404 pcpu_size[i-1] += pcpu_size[i];
405 pcpu_num_used--;
406 memmove(&pcpu_size[i], &pcpu_size[i+1],
407 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
408 i--;
409 }
410 /* Merge with next? */
411 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
412 pcpu_size[i] += pcpu_size[i+1];
413 pcpu_num_used--;
414 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
415 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
416 }
417}
418
419static unsigned int find_pcpusec(Elf_Ehdr *hdr,
420 Elf_Shdr *sechdrs,
421 const char *secstrings)
422{
423 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
424}
425
426static int percpu_modinit(void)
427{
428 pcpu_num_used = 2;
429 pcpu_num_allocated = 2;
430 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
431 GFP_KERNEL);
432 /* Static in-kernel percpu data (used). */
433 pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES);
434 /* Free room. */
435 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
436 if (pcpu_size[1] < 0) {
437 printk(KERN_ERR "No per-cpu room for modules.\n");
438 pcpu_num_used = 1;
439 }
440
441 return 0;
442}
443__initcall(percpu_modinit);
444#else /* ... !CONFIG_SMP */
Rusty Russell842bbaa2005-08-01 21:11:47 -0700445static inline void *percpu_modalloc(unsigned long size, unsigned long align,
446 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447{
448 return NULL;
449}
450static inline void percpu_modfree(void *pcpuptr)
451{
452 BUG();
453}
454static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
455 Elf_Shdr *sechdrs,
456 const char *secstrings)
457{
458 return 0;
459}
460static inline void percpu_modcopy(void *pcpudst, const void *src,
461 unsigned long size)
462{
463 /* pcpusec should be 0, and size of that section should be 0. */
464 BUG_ON(size != 0);
465}
466#endif /* CONFIG_SMP */
467
Matt Domschc988d2b2005-06-23 22:05:15 -0700468#define MODINFO_ATTR(field) \
469static void setup_modinfo_##field(struct module *mod, const char *s) \
470{ \
471 mod->field = kstrdup(s, GFP_KERNEL); \
472} \
473static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
474 struct module *mod, char *buffer) \
475{ \
476 return sprintf(buffer, "%s\n", mod->field); \
477} \
478static int modinfo_##field##_exists(struct module *mod) \
479{ \
480 return mod->field != NULL; \
481} \
482static void free_modinfo_##field(struct module *mod) \
483{ \
484 kfree(mod->field); \
485 mod->field = NULL; \
486} \
487static struct module_attribute modinfo_##field = { \
488 .attr = { .name = __stringify(field), .mode = 0444, \
489 .owner = THIS_MODULE }, \
490 .show = show_modinfo_##field, \
491 .setup = setup_modinfo_##field, \
492 .test = modinfo_##field##_exists, \
493 .free = free_modinfo_##field, \
494};
495
496MODINFO_ATTR(version);
497MODINFO_ATTR(srcversion);
498
Greg Kroah-Hartman03e88ae2006-02-16 13:50:23 -0800499#ifdef CONFIG_MODULE_UNLOAD
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500/* Init the unload section of the module. */
501static void module_unload_init(struct module *mod)
502{
503 unsigned int i;
504
505 INIT_LIST_HEAD(&mod->modules_which_use_me);
506 for (i = 0; i < NR_CPUS; i++)
507 local_set(&mod->ref[i].count, 0);
508 /* Hold reference count during initialization. */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700509 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 /* Backwards compatibility macros put refcount during init. */
511 mod->waiter = current;
512}
513
514/* modules using other modules */
515struct module_use
516{
517 struct list_head list;
518 struct module *module_which_uses;
519};
520
521/* Does a already use b? */
522static int already_uses(struct module *a, struct module *b)
523{
524 struct module_use *use;
525
526 list_for_each_entry(use, &b->modules_which_use_me, list) {
527 if (use->module_which_uses == a) {
528 DEBUGP("%s uses %s!\n", a->name, b->name);
529 return 1;
530 }
531 }
532 DEBUGP("%s does not use %s!\n", a->name, b->name);
533 return 0;
534}
535
536/* Module a uses b */
537static int use_module(struct module *a, struct module *b)
538{
539 struct module_use *use;
540 if (b == NULL || already_uses(a, b)) return 1;
541
542 if (!strong_try_module_get(b))
543 return 0;
544
545 DEBUGP("Allocating new usage for %s.\n", a->name);
546 use = kmalloc(sizeof(*use), GFP_ATOMIC);
547 if (!use) {
548 printk("%s: out of memory loading\n", a->name);
549 module_put(b);
550 return 0;
551 }
552
553 use->module_which_uses = a;
554 list_add(&use->list, &b->modules_which_use_me);
555 return 1;
556}
557
558/* Clear the unload stuff of the module. */
559static void module_unload_free(struct module *mod)
560{
561 struct module *i;
562
563 list_for_each_entry(i, &modules, list) {
564 struct module_use *use;
565
566 list_for_each_entry(use, &i->modules_which_use_me, list) {
567 if (use->module_which_uses == mod) {
568 DEBUGP("%s unusing %s\n", mod->name, i->name);
569 module_put(i);
570 list_del(&use->list);
571 kfree(use);
572 /* There can be at most one match. */
573 break;
574 }
575 }
576 }
577}
578
579#ifdef CONFIG_MODULE_FORCE_UNLOAD
Akinobu Mitafb169792006-01-08 01:04:29 -0800580static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581{
582 int ret = (flags & O_TRUNC);
583 if (ret)
Akinobu Mitafb169792006-01-08 01:04:29 -0800584 add_taint(TAINT_FORCED_RMMOD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 return ret;
586}
587#else
Akinobu Mitafb169792006-01-08 01:04:29 -0800588static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
590 return 0;
591}
592#endif /* CONFIG_MODULE_FORCE_UNLOAD */
593
594struct stopref
595{
596 struct module *mod;
597 int flags;
598 int *forced;
599};
600
601/* Whole machine is stopped with interrupts off when this runs. */
602static int __try_stop_module(void *_sref)
603{
604 struct stopref *sref = _sref;
605
606 /* If it's not unused, quit unless we are told to block. */
607 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800608 if (!(*sref->forced = try_force_unload(sref->flags)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 return -EWOULDBLOCK;
610 }
611
612 /* Mark it as dying. */
613 sref->mod->state = MODULE_STATE_GOING;
614 return 0;
615}
616
617static int try_stop_module(struct module *mod, int flags, int *forced)
618{
619 struct stopref sref = { mod, flags, forced };
620
621 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
622}
623
624unsigned int module_refcount(struct module *mod)
625{
626 unsigned int i, total = 0;
627
628 for (i = 0; i < NR_CPUS; i++)
629 total += local_read(&mod->ref[i].count);
630 return total;
631}
632EXPORT_SYMBOL(module_refcount);
633
634/* This exists whether we can unload or not */
635static void free_module(struct module *mod);
636
637static void wait_for_zero_refcount(struct module *mod)
638{
639 /* Since we might sleep for some time, drop the semaphore first */
Ashutosh Naik6389a382006-03-23 03:00:46 -0800640 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 for (;;) {
642 DEBUGP("Looking at refcount...\n");
643 set_current_state(TASK_UNINTERRUPTIBLE);
644 if (module_refcount(mod) == 0)
645 break;
646 schedule();
647 }
648 current->state = TASK_RUNNING;
Ashutosh Naik6389a382006-03-23 03:00:46 -0800649 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650}
651
652asmlinkage long
653sys_delete_module(const char __user *name_user, unsigned int flags)
654{
655 struct module *mod;
656 char name[MODULE_NAME_LEN];
657 int ret, forced = 0;
658
659 if (!capable(CAP_SYS_MODULE))
660 return -EPERM;
661
662 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
663 return -EFAULT;
664 name[MODULE_NAME_LEN-1] = '\0';
665
Ashutosh Naik6389a382006-03-23 03:00:46 -0800666 if (mutex_lock_interruptible(&module_mutex) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 return -EINTR;
668
669 mod = find_module(name);
670 if (!mod) {
671 ret = -ENOENT;
672 goto out;
673 }
674
675 if (!list_empty(&mod->modules_which_use_me)) {
676 /* Other modules depend on us: get rid of them first. */
677 ret = -EWOULDBLOCK;
678 goto out;
679 }
680
681 /* Doing init or already dying? */
682 if (mod->state != MODULE_STATE_LIVE) {
683 /* FIXME: if (force), slam module count and wake up
684 waiter --RR */
685 DEBUGP("%s already dying\n", mod->name);
686 ret = -EBUSY;
687 goto out;
688 }
689
690 /* If it has an init func, it must have an exit func to unload */
691 if ((mod->init != NULL && mod->exit == NULL)
692 || mod->unsafe) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800693 forced = try_force_unload(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 if (!forced) {
695 /* This module can't be removed */
696 ret = -EBUSY;
697 goto out;
698 }
699 }
700
701 /* Set this up before setting mod->state */
702 mod->waiter = current;
703
704 /* Stop the machine so refcounts can't move and disable module. */
705 ret = try_stop_module(mod, flags, &forced);
706 if (ret != 0)
707 goto out;
708
709 /* Never wait if forced. */
710 if (!forced && module_refcount(mod) != 0)
711 wait_for_zero_refcount(mod);
712
713 /* Final destruction now noone is using it. */
714 if (mod->exit != NULL) {
Ashutosh Naik6389a382006-03-23 03:00:46 -0800715 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 mod->exit();
Ashutosh Naik6389a382006-03-23 03:00:46 -0800717 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 }
719 free_module(mod);
720
721 out:
Ashutosh Naik6389a382006-03-23 03:00:46 -0800722 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 return ret;
724}
725
726static void print_unload_info(struct seq_file *m, struct module *mod)
727{
728 struct module_use *use;
729 int printed_something = 0;
730
731 seq_printf(m, " %u ", module_refcount(mod));
732
733 /* Always include a trailing , so userspace can differentiate
734 between this and the old multi-field proc format. */
735 list_for_each_entry(use, &mod->modules_which_use_me, list) {
736 printed_something = 1;
737 seq_printf(m, "%s,", use->module_which_uses->name);
738 }
739
740 if (mod->unsafe) {
741 printed_something = 1;
742 seq_printf(m, "[unsafe],");
743 }
744
745 if (mod->init != NULL && mod->exit == NULL) {
746 printed_something = 1;
747 seq_printf(m, "[permanent],");
748 }
749
750 if (!printed_something)
751 seq_printf(m, "-");
752}
753
754void __symbol_put(const char *symbol)
755{
756 struct module *owner;
757 unsigned long flags;
758 const unsigned long *crc;
759
760 spin_lock_irqsave(&modlist_lock, flags);
761 if (!__find_symbol(symbol, &owner, &crc, 1))
762 BUG();
763 module_put(owner);
764 spin_unlock_irqrestore(&modlist_lock, flags);
765}
766EXPORT_SYMBOL(__symbol_put);
767
768void symbol_put_addr(void *addr)
769{
Trent Piepho5e376612006-05-15 09:44:06 -0700770 struct module *modaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Trent Piepho5e376612006-05-15 09:44:06 -0700772 if (core_kernel_text((unsigned long)addr))
773 return;
774
775 if (!(modaddr = module_text_address((unsigned long)addr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 BUG();
Trent Piepho5e376612006-05-15 09:44:06 -0700777 module_put(modaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778}
779EXPORT_SYMBOL_GPL(symbol_put_addr);
780
781static ssize_t show_refcnt(struct module_attribute *mattr,
782 struct module *mod, char *buffer)
783{
784 /* sysfs holds a reference */
785 return sprintf(buffer, "%u\n", module_refcount(mod)-1);
786}
787
788static struct module_attribute refcnt = {
789 .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE },
790 .show = show_refcnt,
791};
792
793#else /* !CONFIG_MODULE_UNLOAD */
794static void print_unload_info(struct seq_file *m, struct module *mod)
795{
796 /* We don't know the usage count, or what modules are using. */
797 seq_printf(m, " - -");
798}
799
800static inline void module_unload_free(struct module *mod)
801{
802}
803
804static inline int use_module(struct module *a, struct module *b)
805{
806 return strong_try_module_get(b);
807}
808
809static inline void module_unload_init(struct module *mod)
810{
811}
812#endif /* CONFIG_MODULE_UNLOAD */
813
Greg Kroah-Hartman03e88ae2006-02-16 13:50:23 -0800814static struct module_attribute *modinfo_attrs[] = {
815 &modinfo_version,
816 &modinfo_srcversion,
817#ifdef CONFIG_MODULE_UNLOAD
818 &refcnt,
819#endif
820 NULL,
821};
822
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823static const char vermagic[] = VERMAGIC_STRING;
824
825#ifdef CONFIG_MODVERSIONS
826static int check_version(Elf_Shdr *sechdrs,
827 unsigned int versindex,
828 const char *symname,
829 struct module *mod,
830 const unsigned long *crc)
831{
832 unsigned int i, num_versions;
833 struct modversion_info *versions;
834
835 /* Exporting module didn't supply crcs? OK, we're already tainted. */
836 if (!crc)
837 return 1;
838
839 versions = (void *) sechdrs[versindex].sh_addr;
840 num_versions = sechdrs[versindex].sh_size
841 / sizeof(struct modversion_info);
842
843 for (i = 0; i < num_versions; i++) {
844 if (strcmp(versions[i].name, symname) != 0)
845 continue;
846
847 if (versions[i].crc == *crc)
848 return 1;
849 printk("%s: disagrees about version of symbol %s\n",
850 mod->name, symname);
851 DEBUGP("Found checksum %lX vs module %lX\n",
852 *crc, versions[i].crc);
853 return 0;
854 }
855 /* Not in module's version table. OK, but that taints the kernel. */
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700856 if (!(tainted & TAINT_FORCED_MODULE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 printk("%s: no version for \"%s\" found: kernel tainted.\n",
858 mod->name, symname);
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700859 add_taint_module(mod, TAINT_FORCED_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 return 1;
861}
862
863static inline int check_modstruct_version(Elf_Shdr *sechdrs,
864 unsigned int versindex,
865 struct module *mod)
866{
867 const unsigned long *crc;
868 struct module *owner;
869
870 if (!__find_symbol("struct_module", &owner, &crc, 1))
871 BUG();
872 return check_version(sechdrs, versindex, "struct_module", mod,
873 crc);
874}
875
876/* First part is kernel version, which we ignore. */
877static inline int same_magic(const char *amagic, const char *bmagic)
878{
879 amagic += strcspn(amagic, " ");
880 bmagic += strcspn(bmagic, " ");
881 return strcmp(amagic, bmagic) == 0;
882}
883#else
884static inline 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 return 1;
891}
892
893static inline int check_modstruct_version(Elf_Shdr *sechdrs,
894 unsigned int versindex,
895 struct module *mod)
896{
897 return 1;
898}
899
900static inline int same_magic(const char *amagic, const char *bmagic)
901{
902 return strcmp(amagic, bmagic) == 0;
903}
904#endif /* CONFIG_MODVERSIONS */
905
906/* Resolve a symbol for this module. I.e. if we find one, record usage.
907 Must be holding module_mutex. */
908static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
909 unsigned int versindex,
910 const char *name,
911 struct module *mod)
912{
913 struct module *owner;
914 unsigned long ret;
915 const unsigned long *crc;
916
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700917 ret = __find_symbol(name, &owner, &crc,
918 !(mod->taints & TAINT_PROPRIETARY_MODULE));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 if (ret) {
920 /* use_module can fail due to OOM, or module unloading */
921 if (!check_version(sechdrs, versindex, name, mod, crc) ||
922 !use_module(mod, owner))
923 ret = 0;
924 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 return ret;
926}
927
928
929/*
930 * /sys/module/foo/sections stuff
931 * J. Corbet <corbet@lwn.net>
932 */
933#ifdef CONFIG_KALLSYMS
934static ssize_t module_sect_show(struct module_attribute *mattr,
935 struct module *mod, char *buf)
936{
937 struct module_sect_attr *sattr =
938 container_of(mattr, struct module_sect_attr, mattr);
939 return sprintf(buf, "0x%lx\n", sattr->address);
940}
941
Ian S. Nelson04b1db92006-09-29 02:01:31 -0700942static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
943{
944 int section;
945
946 for (section = 0; section < sect_attrs->nsections; section++)
947 kfree(sect_attrs->attrs[section].name);
948 kfree(sect_attrs);
949}
950
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951static void add_sect_attrs(struct module *mod, unsigned int nsect,
952 char *secstrings, Elf_Shdr *sechdrs)
953{
954 unsigned int nloaded = 0, i, size[2];
955 struct module_sect_attrs *sect_attrs;
956 struct module_sect_attr *sattr;
957 struct attribute **gattr;
958
959 /* Count loaded sections and allocate structures */
960 for (i = 0; i < nsect; i++)
961 if (sechdrs[i].sh_flags & SHF_ALLOC)
962 nloaded++;
963 size[0] = ALIGN(sizeof(*sect_attrs)
964 + nloaded * sizeof(sect_attrs->attrs[0]),
965 sizeof(sect_attrs->grp.attrs[0]));
966 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
Ian S. Nelson04b1db92006-09-29 02:01:31 -0700967 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
968 if (sect_attrs == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 return;
970
971 /* Setup section attributes. */
972 sect_attrs->grp.name = "sections";
973 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
974
Ian S. Nelson04b1db92006-09-29 02:01:31 -0700975 sect_attrs->nsections = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 sattr = &sect_attrs->attrs[0];
977 gattr = &sect_attrs->grp.attrs[0];
978 for (i = 0; i < nsect; i++) {
979 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
980 continue;
981 sattr->address = sechdrs[i].sh_addr;
Ian S. Nelson04b1db92006-09-29 02:01:31 -0700982 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
983 GFP_KERNEL);
984 if (sattr->name == NULL)
985 goto out;
986 sect_attrs->nsections++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 sattr->mattr.show = module_sect_show;
988 sattr->mattr.store = NULL;
989 sattr->mattr.attr.name = sattr->name;
990 sattr->mattr.attr.owner = mod;
991 sattr->mattr.attr.mode = S_IRUGO;
992 *(gattr++) = &(sattr++)->mattr.attr;
993 }
994 *gattr = NULL;
995
996 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
997 goto out;
998
999 mod->sect_attrs = sect_attrs;
1000 return;
1001 out:
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001002 free_sect_attrs(sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003}
1004
1005static void remove_sect_attrs(struct module *mod)
1006{
1007 if (mod->sect_attrs) {
1008 sysfs_remove_group(&mod->mkobj.kobj,
1009 &mod->sect_attrs->grp);
1010 /* We are positive that no one is using any sect attrs
1011 * at this point. Deallocate immediately. */
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001012 free_sect_attrs(mod->sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 mod->sect_attrs = NULL;
1014 }
1015}
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017#else
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001018
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1020 char *sectstrings, Elf_Shdr *sechdrs)
1021{
1022}
1023
1024static inline void remove_sect_attrs(struct module *mod)
1025{
1026}
1027#endif /* CONFIG_KALLSYMS */
1028
Matt Domschc988d2b2005-06-23 22:05:15 -07001029static int module_add_modinfo_attrs(struct module *mod)
1030{
1031 struct module_attribute *attr;
Greg Kroah-Hartman03e88ae2006-02-16 13:50:23 -08001032 struct module_attribute *temp_attr;
Matt Domschc988d2b2005-06-23 22:05:15 -07001033 int error = 0;
1034 int i;
1035
Greg Kroah-Hartman03e88ae2006-02-16 13:50:23 -08001036 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1037 (ARRAY_SIZE(modinfo_attrs) + 1)),
1038 GFP_KERNEL);
1039 if (!mod->modinfo_attrs)
1040 return -ENOMEM;
1041
1042 temp_attr = mod->modinfo_attrs;
Matt Domschc988d2b2005-06-23 22:05:15 -07001043 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1044 if (!attr->test ||
Greg Kroah-Hartman03e88ae2006-02-16 13:50:23 -08001045 (attr->test && attr->test(mod))) {
1046 memcpy(temp_attr, attr, sizeof(*temp_attr));
1047 temp_attr->attr.owner = mod;
1048 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1049 ++temp_attr;
1050 }
Matt Domschc988d2b2005-06-23 22:05:15 -07001051 }
1052 return error;
1053}
1054
1055static void module_remove_modinfo_attrs(struct module *mod)
1056{
1057 struct module_attribute *attr;
1058 int i;
1059
Greg Kroah-Hartman03e88ae2006-02-16 13:50:23 -08001060 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1061 /* pick a field to test for end of list */
1062 if (!attr->attr.name)
1063 break;
Matt Domschc988d2b2005-06-23 22:05:15 -07001064 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
Greg Kroah-Hartman03e88ae2006-02-16 13:50:23 -08001065 if (attr->free)
1066 attr->free(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001067 }
Greg Kroah-Hartman03e88ae2006-02-16 13:50:23 -08001068 kfree(mod->modinfo_attrs);
Matt Domschc988d2b2005-06-23 22:05:15 -07001069}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070
1071static int mod_sysfs_setup(struct module *mod,
1072 struct kernel_param *kparam,
1073 unsigned int num_params)
1074{
1075 int err;
1076
Ed Swierk1cc5f712006-09-25 16:25:36 -07001077 if (!module_subsys.kset.subsys) {
1078 printk(KERN_ERR "%s: module_subsys not initialized\n",
1079 mod->name);
1080 err = -EINVAL;
1081 goto out;
1082 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1084 err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name);
1085 if (err)
1086 goto out;
1087 kobj_set_kset_s(&mod->mkobj, module_subsys);
1088 mod->mkobj.mod = mod;
1089 err = kobject_register(&mod->mkobj.kobj);
1090 if (err)
1091 goto out;
1092
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 err = module_param_sysfs_setup(mod, kparam, num_params);
1094 if (err)
1095 goto out_unreg;
1096
Matt Domschc988d2b2005-06-23 22:05:15 -07001097 err = module_add_modinfo_attrs(mod);
1098 if (err)
1099 goto out_unreg;
Matt Domschc988d2b2005-06-23 22:05:15 -07001100
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 return 0;
1102
1103out_unreg:
1104 kobject_unregister(&mod->mkobj.kobj);
1105out:
1106 return err;
1107}
1108
1109static void mod_kobject_remove(struct module *mod)
1110{
Matt Domschc988d2b2005-06-23 22:05:15 -07001111 module_remove_modinfo_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 module_param_sysfs_remove(mod);
1113
1114 kobject_unregister(&mod->mkobj.kobj);
1115}
1116
1117/*
1118 * unlink the module with the whole machine is stopped with interrupts off
1119 * - this defends against kallsyms not taking locks
1120 */
1121static int __unlink_module(void *_mod)
1122{
1123 struct module *mod = _mod;
1124 list_del(&mod->list);
1125 return 0;
1126}
1127
1128/* Free a module, remove from lists, etc (must hold module mutex). */
1129static void free_module(struct module *mod)
1130{
1131 /* Delete from various lists */
1132 stop_machine_run(__unlink_module, mod, NR_CPUS);
1133 remove_sect_attrs(mod);
1134 mod_kobject_remove(mod);
1135
Jan Beulich4552d5d2006-06-26 13:57:28 +02001136 unwind_remove_table(mod->unwind_info, 0);
1137
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 /* Arch-specific cleanup. */
1139 module_arch_cleanup(mod);
1140
1141 /* Module unload stuff */
1142 module_unload_free(mod);
1143
1144 /* This may be NULL, but that's OK */
1145 module_free(mod, mod->module_init);
1146 kfree(mod->args);
1147 if (mod->percpu)
1148 percpu_modfree(mod->percpu);
1149
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001150 /* Free lock-classes: */
1151 lockdep_free_key_range(mod->module_core, mod->core_size);
1152
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 /* Finally, free the core (containing the module structure) */
1154 module_free(mod, mod->module_core);
1155}
1156
1157void *__symbol_get(const char *symbol)
1158{
1159 struct module *owner;
1160 unsigned long value, flags;
1161 const unsigned long *crc;
1162
1163 spin_lock_irqsave(&modlist_lock, flags);
1164 value = __find_symbol(symbol, &owner, &crc, 1);
1165 if (value && !strong_try_module_get(owner))
1166 value = 0;
1167 spin_unlock_irqrestore(&modlist_lock, flags);
1168
1169 return (void *)value;
1170}
1171EXPORT_SYMBOL_GPL(__symbol_get);
1172
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001173/*
1174 * Ensure that an exported symbol [global namespace] does not already exist
1175 * in the Kernel or in some other modules exported symbol table.
1176 */
1177static int verify_export_symbols(struct module *mod)
1178{
1179 const char *name = NULL;
1180 unsigned long i, ret = 0;
1181 struct module *owner;
1182 const unsigned long *crc;
1183
1184 for (i = 0; i < mod->num_syms; i++)
1185 if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
1186 name = mod->syms[i].name;
1187 ret = -ENOEXEC;
1188 goto dup;
1189 }
1190
1191 for (i = 0; i < mod->num_gpl_syms; i++)
1192 if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) {
1193 name = mod->gpl_syms[i].name;
1194 ret = -ENOEXEC;
1195 goto dup;
1196 }
1197
1198dup:
1199 if (ret)
1200 printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
1201 mod->name, name, module_name(owner));
1202
1203 return ret;
1204}
1205
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206/* Change all symbols so that sh_value encodes the pointer directly. */
1207static int simplify_symbols(Elf_Shdr *sechdrs,
1208 unsigned int symindex,
1209 const char *strtab,
1210 unsigned int versindex,
1211 unsigned int pcpuindex,
1212 struct module *mod)
1213{
1214 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1215 unsigned long secbase;
1216 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1217 int ret = 0;
1218
1219 for (i = 1; i < n; i++) {
1220 switch (sym[i].st_shndx) {
1221 case SHN_COMMON:
1222 /* We compiled with -fno-common. These are not
1223 supposed to happen. */
1224 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1225 printk("%s: please compile with -fno-common\n",
1226 mod->name);
1227 ret = -ENOEXEC;
1228 break;
1229
1230 case SHN_ABS:
1231 /* Don't need to do anything */
1232 DEBUGP("Absolute symbol: 0x%08lx\n",
1233 (long)sym[i].st_value);
1234 break;
1235
1236 case SHN_UNDEF:
1237 sym[i].st_value
1238 = resolve_symbol(sechdrs, versindex,
1239 strtab + sym[i].st_name, mod);
1240
1241 /* Ok if resolved. */
1242 if (sym[i].st_value != 0)
1243 break;
1244 /* Ok if weak. */
1245 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1246 break;
1247
1248 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1249 mod->name, strtab + sym[i].st_name);
1250 ret = -ENOENT;
1251 break;
1252
1253 default:
1254 /* Divert to percpu allocation if a percpu var. */
1255 if (sym[i].st_shndx == pcpuindex)
1256 secbase = (unsigned long)mod->percpu;
1257 else
1258 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1259 sym[i].st_value += secbase;
1260 break;
1261 }
1262 }
1263
1264 return ret;
1265}
1266
1267/* Update size with this section: return offset. */
1268static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1269{
1270 long ret;
1271
1272 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1273 *size = ret + sechdr->sh_size;
1274 return ret;
1275}
1276
1277/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1278 might -- code, read-only data, read-write data, small data. Tally
1279 sizes, and place the offsets into sh_entsize fields: high bit means it
1280 belongs in init. */
1281static void layout_sections(struct module *mod,
1282 const Elf_Ehdr *hdr,
1283 Elf_Shdr *sechdrs,
1284 const char *secstrings)
1285{
1286 static unsigned long const masks[][2] = {
1287 /* NOTE: all executable code must be the first section
1288 * in this array; otherwise modify the text_size
1289 * finder in the two loops below */
1290 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1291 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1292 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1293 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1294 };
1295 unsigned int m, i;
1296
1297 for (i = 0; i < hdr->e_shnum; i++)
1298 sechdrs[i].sh_entsize = ~0UL;
1299
1300 DEBUGP("Core section allocation order:\n");
1301 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1302 for (i = 0; i < hdr->e_shnum; ++i) {
1303 Elf_Shdr *s = &sechdrs[i];
1304
1305 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1306 || (s->sh_flags & masks[m][1])
1307 || s->sh_entsize != ~0UL
1308 || strncmp(secstrings + s->sh_name,
1309 ".init", 5) == 0)
1310 continue;
1311 s->sh_entsize = get_offset(&mod->core_size, s);
1312 DEBUGP("\t%s\n", secstrings + s->sh_name);
1313 }
1314 if (m == 0)
1315 mod->core_text_size = mod->core_size;
1316 }
1317
1318 DEBUGP("Init section allocation order:\n");
1319 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1320 for (i = 0; i < hdr->e_shnum; ++i) {
1321 Elf_Shdr *s = &sechdrs[i];
1322
1323 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1324 || (s->sh_flags & masks[m][1])
1325 || s->sh_entsize != ~0UL
1326 || strncmp(secstrings + s->sh_name,
1327 ".init", 5) != 0)
1328 continue;
1329 s->sh_entsize = (get_offset(&mod->init_size, s)
1330 | INIT_OFFSET_MASK);
1331 DEBUGP("\t%s\n", secstrings + s->sh_name);
1332 }
1333 if (m == 0)
1334 mod->init_text_size = mod->init_size;
1335 }
1336}
1337
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338static void set_license(struct module *mod, const char *license)
1339{
1340 if (!license)
1341 license = "unspecified";
1342
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001343 if (!license_is_gpl_compatible(license)) {
1344 if (!(tainted & TAINT_PROPRIETARY_MODULE))
Jan Dittmer1d4d2622006-10-28 10:38:38 -07001345 printk(KERN_WARNING "%s: module license '%s' taints "
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001346 "kernel.\n", mod->name, license);
1347 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 }
1349}
1350
1351/* Parse tag=value strings from .modinfo section */
1352static char *next_string(char *string, unsigned long *secsize)
1353{
1354 /* Skip non-zero chars */
1355 while (string[0]) {
1356 string++;
1357 if ((*secsize)-- <= 1)
1358 return NULL;
1359 }
1360
1361 /* Skip any zero padding. */
1362 while (!string[0]) {
1363 string++;
1364 if ((*secsize)-- <= 1)
1365 return NULL;
1366 }
1367 return string;
1368}
1369
1370static char *get_modinfo(Elf_Shdr *sechdrs,
1371 unsigned int info,
1372 const char *tag)
1373{
1374 char *p;
1375 unsigned int taglen = strlen(tag);
1376 unsigned long size = sechdrs[info].sh_size;
1377
1378 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1379 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1380 return p + taglen + 1;
1381 }
1382 return NULL;
1383}
1384
Matt Domschc988d2b2005-06-23 22:05:15 -07001385static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1386 unsigned int infoindex)
1387{
1388 struct module_attribute *attr;
1389 int i;
1390
1391 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1392 if (attr->setup)
1393 attr->setup(mod,
1394 get_modinfo(sechdrs,
1395 infoindex,
1396 attr->attr.name));
1397 }
1398}
Matt Domschc988d2b2005-06-23 22:05:15 -07001399
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400#ifdef CONFIG_KALLSYMS
1401int is_exported(const char *name, const struct module *mod)
1402{
Sam Ravnborg3fd68052006-02-08 21:16:45 +01001403 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1404 return 1;
1405 else
Jesper Juhlf867d2a2006-06-25 05:47:09 -07001406 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 return 1;
Sam Ravnborg3fd68052006-02-08 21:16:45 +01001408 else
1409 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410}
1411
1412/* As per nm */
1413static char elf_type(const Elf_Sym *sym,
1414 Elf_Shdr *sechdrs,
1415 const char *secstrings,
1416 struct module *mod)
1417{
1418 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1419 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1420 return 'v';
1421 else
1422 return 'w';
1423 }
1424 if (sym->st_shndx == SHN_UNDEF)
1425 return 'U';
1426 if (sym->st_shndx == SHN_ABS)
1427 return 'a';
1428 if (sym->st_shndx >= SHN_LORESERVE)
1429 return '?';
1430 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1431 return 't';
1432 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1433 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1434 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1435 return 'r';
1436 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1437 return 'g';
1438 else
1439 return 'd';
1440 }
1441 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1442 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1443 return 's';
1444 else
1445 return 'b';
1446 }
1447 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1448 ".debug", strlen(".debug")) == 0)
1449 return 'n';
1450 return '?';
1451}
1452
1453static void add_kallsyms(struct module *mod,
1454 Elf_Shdr *sechdrs,
1455 unsigned int symindex,
1456 unsigned int strindex,
1457 const char *secstrings)
1458{
1459 unsigned int i;
1460
1461 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1462 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1463 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1464
1465 /* Set types up while we still have access to sections. */
1466 for (i = 0; i < mod->num_symtab; i++)
1467 mod->symtab[i].st_info
1468 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1469}
1470#else
1471static inline void add_kallsyms(struct module *mod,
1472 Elf_Shdr *sechdrs,
1473 unsigned int symindex,
1474 unsigned int strindex,
1475 const char *secstrings)
1476{
1477}
1478#endif /* CONFIG_KALLSYMS */
1479
1480/* Allocate and load the module: note that size of section 0 is always
1481 zero, and we rely on this for optional sections. */
1482static struct module *load_module(void __user *umod,
1483 unsigned long len,
1484 const char __user *uargs)
1485{
1486 Elf_Ehdr *hdr;
1487 Elf_Shdr *sechdrs;
1488 char *secstrings, *args, *modmagic, *strtab = NULL;
Andrew Morton84860f92006-06-28 04:26:46 -07001489 unsigned int i;
1490 unsigned int symindex = 0;
1491 unsigned int strindex = 0;
1492 unsigned int setupindex;
1493 unsigned int exindex;
1494 unsigned int exportindex;
1495 unsigned int modindex;
1496 unsigned int obsparmindex;
1497 unsigned int infoindex;
1498 unsigned int gplindex;
1499 unsigned int crcindex;
1500 unsigned int gplcrcindex;
1501 unsigned int versindex;
1502 unsigned int pcpuindex;
1503 unsigned int gplfutureindex;
1504 unsigned int gplfuturecrcindex;
1505 unsigned int unwindex = 0;
1506 unsigned int unusedindex;
1507 unsigned int unusedcrcindex;
1508 unsigned int unusedgplindex;
1509 unsigned int unusedgplcrcindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 struct module *mod;
1511 long err = 0;
1512 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1513 struct exception_table_entry *extable;
Thomas Koeller378bac82005-09-06 15:17:11 -07001514 mm_segment_t old_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515
1516 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1517 umod, len, uargs);
1518 if (len < sizeof(*hdr))
1519 return ERR_PTR(-ENOEXEC);
1520
1521 /* Suck in entire file: we'll want most of it. */
1522 /* vmalloc barfs on "unusual" numbers. Check here */
1523 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1524 return ERR_PTR(-ENOMEM);
1525 if (copy_from_user(hdr, umod, len) != 0) {
1526 err = -EFAULT;
1527 goto free_hdr;
1528 }
1529
1530 /* Sanity checks against insmoding binaries or wrong arch,
1531 weird elf version */
1532 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1533 || hdr->e_type != ET_REL
1534 || !elf_check_arch(hdr)
1535 || hdr->e_shentsize != sizeof(*sechdrs)) {
1536 err = -ENOEXEC;
1537 goto free_hdr;
1538 }
1539
1540 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1541 goto truncated;
1542
1543 /* Convenience variables */
1544 sechdrs = (void *)hdr + hdr->e_shoff;
1545 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1546 sechdrs[0].sh_addr = 0;
1547
1548 for (i = 1; i < hdr->e_shnum; i++) {
1549 if (sechdrs[i].sh_type != SHT_NOBITS
1550 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1551 goto truncated;
1552
1553 /* Mark all sections sh_addr with their address in the
1554 temporary image. */
1555 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1556
1557 /* Internal symbols and strings. */
1558 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1559 symindex = i;
1560 strindex = sechdrs[i].sh_link;
1561 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1562 }
1563#ifndef CONFIG_MODULE_UNLOAD
1564 /* Don't load .exit sections */
1565 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1566 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1567#endif
1568 }
1569
1570 modindex = find_sec(hdr, sechdrs, secstrings,
1571 ".gnu.linkonce.this_module");
1572 if (!modindex) {
1573 printk(KERN_WARNING "No module found in object\n");
1574 err = -ENOEXEC;
1575 goto free_hdr;
1576 }
1577 mod = (void *)sechdrs[modindex].sh_addr;
1578
1579 if (symindex == 0) {
1580 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1581 mod->name);
1582 err = -ENOEXEC;
1583 goto free_hdr;
1584 }
1585
1586 /* Optional sections */
1587 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1588 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001589 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001590 unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
1591 unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1593 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001594 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001595 unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
1596 unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1598 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1599 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1600 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1601 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1602 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
Jan Beulich4552d5d2006-06-26 13:57:28 +02001603#ifdef ARCH_UNWIND_SECTION_NAME
1604 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1605#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606
1607 /* Don't keep modinfo section */
1608 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1609#ifdef CONFIG_KALLSYMS
1610 /* Keep symbol and string tables for decoding later. */
1611 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1612 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1613#endif
Jan Beulich4552d5d2006-06-26 13:57:28 +02001614 if (unwindex)
1615 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616
1617 /* Check module struct version now, before we try to use module. */
1618 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1619 err = -ENOEXEC;
1620 goto free_hdr;
1621 }
1622
1623 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1624 /* This is allowed: modprobe --force will invalidate it. */
1625 if (!modmagic) {
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001626 add_taint_module(mod, TAINT_FORCED_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1628 mod->name);
1629 } else if (!same_magic(modmagic, vermagic)) {
1630 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1631 mod->name, modmagic, vermagic);
1632 err = -ENOEXEC;
1633 goto free_hdr;
1634 }
1635
1636 /* Now copy in args */
Davi Arnaut24277dd2006-03-24 03:18:43 -08001637 args = strndup_user(uargs, ~0UL >> 1);
1638 if (IS_ERR(args)) {
1639 err = PTR_ERR(args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 goto free_hdr;
1641 }
Andrew Morton8e08b752006-02-07 12:58:45 -08001642
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 if (find_module(mod->name)) {
1644 err = -EEXIST;
1645 goto free_mod;
1646 }
1647
1648 mod->state = MODULE_STATE_COMING;
1649
1650 /* Allow arches to frob section contents and sizes. */
1651 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1652 if (err < 0)
1653 goto free_mod;
1654
1655 if (pcpuindex) {
1656 /* We have a special allocation for this section. */
1657 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
Rusty Russell842bbaa2005-08-01 21:11:47 -07001658 sechdrs[pcpuindex].sh_addralign,
1659 mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 if (!percpu) {
1661 err = -ENOMEM;
1662 goto free_mod;
1663 }
1664 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1665 mod->percpu = percpu;
1666 }
1667
1668 /* Determine total sizes, and put offsets in sh_entsize. For now
1669 this is done generically; there doesn't appear to be any
1670 special cases for the architectures. */
1671 layout_sections(mod, hdr, sechdrs, secstrings);
1672
1673 /* Do the allocs. */
1674 ptr = module_alloc(mod->core_size);
1675 if (!ptr) {
1676 err = -ENOMEM;
1677 goto free_percpu;
1678 }
1679 memset(ptr, 0, mod->core_size);
1680 mod->module_core = ptr;
1681
1682 ptr = module_alloc(mod->init_size);
1683 if (!ptr && mod->init_size) {
1684 err = -ENOMEM;
1685 goto free_core;
1686 }
1687 memset(ptr, 0, mod->init_size);
1688 mod->module_init = ptr;
1689
1690 /* Transfer each section which specifies SHF_ALLOC */
1691 DEBUGP("final section addresses:\n");
1692 for (i = 0; i < hdr->e_shnum; i++) {
1693 void *dest;
1694
1695 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1696 continue;
1697
1698 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1699 dest = mod->module_init
1700 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1701 else
1702 dest = mod->module_core + sechdrs[i].sh_entsize;
1703
1704 if (sechdrs[i].sh_type != SHT_NOBITS)
1705 memcpy(dest, (void *)sechdrs[i].sh_addr,
1706 sechdrs[i].sh_size);
1707 /* Update sh_addr to point to copy in image. */
1708 sechdrs[i].sh_addr = (unsigned long)dest;
1709 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1710 }
1711 /* Module has been moved. */
1712 mod = (void *)sechdrs[modindex].sh_addr;
1713
1714 /* Now we've moved module, initialize linked lists, etc. */
1715 module_unload_init(mod);
1716
1717 /* Set up license info based on the info section */
1718 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1719
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001720 if (strcmp(mod->name, "ndiswrapper") == 0)
Randy Dunlap0e2d57f2006-10-29 22:46:34 -08001721 add_taint(TAINT_PROPRIETARY_MODULE);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001722 if (strcmp(mod->name, "driverloader") == 0)
1723 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Dave Jones9841d612006-01-08 01:03:41 -08001724
Matt Domschc988d2b2005-06-23 22:05:15 -07001725 /* Set up MODINFO_ATTR fields */
1726 setup_modinfo(mod, sechdrs, infoindex);
Matt Domschc988d2b2005-06-23 22:05:15 -07001727
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 /* Fix up syms, so that st_value is a pointer to location. */
1729 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1730 mod);
1731 if (err < 0)
1732 goto cleanup;
1733
1734 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1735 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1736 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1737 if (crcindex)
1738 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1739 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1740 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1741 if (gplcrcindex)
1742 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001743 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
1744 sizeof(*mod->gpl_future_syms);
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001745 mod->num_unused_syms = sechdrs[unusedindex].sh_size /
1746 sizeof(*mod->unused_syms);
1747 mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
1748 sizeof(*mod->unused_gpl_syms);
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001749 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
1750 if (gplfuturecrcindex)
1751 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001753 mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
1754 if (unusedcrcindex)
1755 mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
1756 mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
1757 if (unusedgplcrcindex)
1758 mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr;
1759
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760#ifdef CONFIG_MODVERSIONS
1761 if ((mod->num_syms && !crcindex) ||
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001762 (mod->num_gpl_syms && !gplcrcindex) ||
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001763 (mod->num_gpl_future_syms && !gplfuturecrcindex) ||
1764 (mod->num_unused_syms && !unusedcrcindex) ||
1765 (mod->num_unused_gpl_syms && !unusedgplcrcindex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 printk(KERN_WARNING "%s: No versions for exported symbols."
1767 " Tainting kernel.\n", mod->name);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001768 add_taint_module(mod, TAINT_FORCED_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 }
1770#endif
1771
1772 /* Now do relocations. */
1773 for (i = 1; i < hdr->e_shnum; i++) {
1774 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1775 unsigned int info = sechdrs[i].sh_info;
1776
1777 /* Not a valid relocation section? */
1778 if (info >= hdr->e_shnum)
1779 continue;
1780
1781 /* Don't bother with non-allocated sections */
1782 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
1783 continue;
1784
1785 if (sechdrs[i].sh_type == SHT_REL)
1786 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
1787 else if (sechdrs[i].sh_type == SHT_RELA)
1788 err = apply_relocate_add(sechdrs, strtab, symindex, i,
1789 mod);
1790 if (err < 0)
1791 goto cleanup;
1792 }
1793
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001794 /* Find duplicate symbols */
1795 err = verify_export_symbols(mod);
1796
1797 if (err < 0)
1798 goto cleanup;
1799
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 /* Set up and sort exception table */
1801 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
1802 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
1803 sort_extable(extable, extable + mod->num_exentries);
1804
1805 /* Finally, copy percpu area over. */
1806 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
1807 sechdrs[pcpuindex].sh_size);
1808
1809 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
1810
1811 err = module_finalize(hdr, sechdrs, mod);
1812 if (err < 0)
1813 goto cleanup;
1814
Thomas Koeller378bac82005-09-06 15:17:11 -07001815 /* flush the icache in correct context */
1816 old_fs = get_fs();
1817 set_fs(KERNEL_DS);
1818
1819 /*
1820 * Flush the instruction cache, since we've played with text.
1821 * Do it before processing of module parameters, so the module
1822 * can provide parameter accessor functions of its own.
1823 */
1824 if (mod->module_init)
1825 flush_icache_range((unsigned long)mod->module_init,
1826 (unsigned long)mod->module_init
1827 + mod->init_size);
1828 flush_icache_range((unsigned long)mod->module_core,
1829 (unsigned long)mod->module_core + mod->core_size);
1830
1831 set_fs(old_fs);
1832
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 mod->args = args;
Rusty Russell8d3b33f2006-03-25 03:07:05 -08001834 if (obsparmindex)
1835 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
1836 mod->name);
1837
1838 /* Size of section 0 is 0, so this works well if no params */
1839 err = parse_args(mod->name, mod->args,
1840 (struct kernel_param *)
1841 sechdrs[setupindex].sh_addr,
1842 sechdrs[setupindex].sh_size
1843 / sizeof(struct kernel_param),
1844 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845 if (err < 0)
1846 goto arch_cleanup;
1847
1848 err = mod_sysfs_setup(mod,
1849 (struct kernel_param *)
1850 sechdrs[setupindex].sh_addr,
1851 sechdrs[setupindex].sh_size
1852 / sizeof(struct kernel_param));
1853 if (err < 0)
1854 goto arch_cleanup;
1855 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
1856
Jan Beulich4552d5d2006-06-26 13:57:28 +02001857 /* Size of section 0 is 0, so this works well if no unwind info. */
1858 mod->unwind_info = unwind_add_table(mod,
1859 (void *)sechdrs[unwindex].sh_addr,
1860 sechdrs[unwindex].sh_size);
1861
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862 /* Get rid of temporary copy */
1863 vfree(hdr);
1864
1865 /* Done! */
1866 return mod;
1867
1868 arch_cleanup:
1869 module_arch_cleanup(mod);
1870 cleanup:
1871 module_unload_free(mod);
1872 module_free(mod, mod->module_init);
1873 free_core:
1874 module_free(mod, mod->module_core);
1875 free_percpu:
1876 if (percpu)
1877 percpu_modfree(percpu);
1878 free_mod:
1879 kfree(args);
1880 free_hdr:
1881 vfree(hdr);
Jayachandran C6fe2e702006-01-06 00:19:54 -08001882 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883
1884 truncated:
1885 printk(KERN_ERR "Module len %lu truncated\n", len);
1886 err = -ENOEXEC;
1887 goto free_hdr;
1888}
1889
1890/*
1891 * link the module with the whole machine is stopped with interrupts off
1892 * - this defends against kallsyms not taking locks
1893 */
1894static int __link_module(void *_mod)
1895{
1896 struct module *mod = _mod;
1897 list_add(&mod->list, &modules);
1898 return 0;
1899}
1900
1901/* This is where the real work happens */
1902asmlinkage long
1903sys_init_module(void __user *umod,
1904 unsigned long len,
1905 const char __user *uargs)
1906{
1907 struct module *mod;
1908 int ret = 0;
1909
1910 /* Must have permission */
1911 if (!capable(CAP_SYS_MODULE))
1912 return -EPERM;
1913
1914 /* Only one module load at a time, please */
Ashutosh Naik6389a382006-03-23 03:00:46 -08001915 if (mutex_lock_interruptible(&module_mutex) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 return -EINTR;
1917
1918 /* Do all the hard work */
1919 mod = load_module(umod, len, uargs);
1920 if (IS_ERR(mod)) {
Ashutosh Naik6389a382006-03-23 03:00:46 -08001921 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 return PTR_ERR(mod);
1923 }
1924
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 /* Now sew it into the lists. They won't access us, since
1926 strong_try_module_get() will fail. */
1927 stop_machine_run(__link_module, mod, NR_CPUS);
1928
1929 /* Drop lock so they can recurse */
Ashutosh Naik6389a382006-03-23 03:00:46 -08001930 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931
Alan Sterne041c682006-03-27 01:16:30 -08001932 blocking_notifier_call_chain(&module_notify_list,
1933 MODULE_STATE_COMING, mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934
1935 /* Start the module */
1936 if (mod->init != NULL)
1937 ret = mod->init();
1938 if (ret < 0) {
1939 /* Init routine failed: abort. Try to protect us from
1940 buggy refcounters. */
1941 mod->state = MODULE_STATE_GOING;
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07001942 synchronize_sched();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 if (mod->unsafe)
1944 printk(KERN_ERR "%s: module is now stuck!\n",
1945 mod->name);
1946 else {
1947 module_put(mod);
Ashutosh Naik6389a382006-03-23 03:00:46 -08001948 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 free_module(mod);
Ashutosh Naik6389a382006-03-23 03:00:46 -08001950 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 }
1952 return ret;
1953 }
1954
1955 /* Now it's a first class citizen! */
Ashutosh Naik6389a382006-03-23 03:00:46 -08001956 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957 mod->state = MODULE_STATE_LIVE;
1958 /* Drop initial reference. */
1959 module_put(mod);
Jan Beulich4552d5d2006-06-26 13:57:28 +02001960 unwind_remove_table(mod->unwind_info, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 module_free(mod, mod->module_init);
1962 mod->module_init = NULL;
1963 mod->init_size = 0;
1964 mod->init_text_size = 0;
Ashutosh Naik6389a382006-03-23 03:00:46 -08001965 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966
1967 return 0;
1968}
1969
1970static inline int within(unsigned long addr, void *start, unsigned long size)
1971{
1972 return ((void *)addr >= start && (void *)addr < start + size);
1973}
1974
1975#ifdef CONFIG_KALLSYMS
1976/*
1977 * This ignores the intensely annoying "mapping symbols" found
1978 * in ARM ELF files: $a, $t and $d.
1979 */
1980static inline int is_arm_mapping_symbol(const char *str)
1981{
1982 return str[0] == '$' && strchr("atd", str[1])
1983 && (str[2] == '\0' || str[2] == '.');
1984}
1985
1986static const char *get_ksymbol(struct module *mod,
1987 unsigned long addr,
1988 unsigned long *size,
1989 unsigned long *offset)
1990{
1991 unsigned int i, best = 0;
1992 unsigned long nextval;
1993
1994 /* At worse, next value is at end of module */
1995 if (within(addr, mod->module_init, mod->init_size))
1996 nextval = (unsigned long)mod->module_init+mod->init_text_size;
1997 else
1998 nextval = (unsigned long)mod->module_core+mod->core_text_size;
1999
2000 /* Scan for closest preceeding symbol, and next symbol. (ELF
2001 starts real symbols at 1). */
2002 for (i = 1; i < mod->num_symtab; i++) {
2003 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2004 continue;
2005
2006 /* We ignore unnamed symbols: they're uninformative
2007 * and inserted at a whim. */
2008 if (mod->symtab[i].st_value <= addr
2009 && mod->symtab[i].st_value > mod->symtab[best].st_value
2010 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2011 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2012 best = i;
2013 if (mod->symtab[i].st_value > addr
2014 && mod->symtab[i].st_value < nextval
2015 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2016 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2017 nextval = mod->symtab[i].st_value;
2018 }
2019
2020 if (!best)
2021 return NULL;
2022
2023 *size = nextval - mod->symtab[best].st_value;
2024 *offset = addr - mod->symtab[best].st_value;
2025 return mod->strtab + mod->symtab[best].st_name;
2026}
2027
2028/* For kallsyms to ask for address resolution. NULL means not found.
2029 We don't lock, as this is used for oops resolution and races are a
2030 lesser concern. */
2031const char *module_address_lookup(unsigned long addr,
2032 unsigned long *size,
2033 unsigned long *offset,
2034 char **modname)
2035{
2036 struct module *mod;
2037
2038 list_for_each_entry(mod, &modules, list) {
2039 if (within(addr, mod->module_init, mod->init_size)
2040 || within(addr, mod->module_core, mod->core_size)) {
Franck Bui-Huuffc50892006-10-03 01:13:48 -07002041 if (modname)
2042 *modname = mod->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043 return get_ksymbol(mod, addr, size, offset);
2044 }
2045 }
2046 return NULL;
2047}
2048
Andreas Gruenbacher098c5ee2006-07-14 00:24:04 -07002049struct module *module_get_kallsym(unsigned int symnum, unsigned long *value,
2050 char *type, char *name, size_t namelen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051{
2052 struct module *mod;
2053
Ashutosh Naik6389a382006-03-23 03:00:46 -08002054 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002055 list_for_each_entry(mod, &modules, list) {
2056 if (symnum < mod->num_symtab) {
2057 *value = mod->symtab[symnum].st_value;
2058 *type = mod->symtab[symnum].st_info;
Andreas Gruenbacher098c5ee2006-07-14 00:24:04 -07002059 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2060 namelen);
Ashutosh Naik6389a382006-03-23 03:00:46 -08002061 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 return mod;
2063 }
2064 symnum -= mod->num_symtab;
2065 }
Ashutosh Naik6389a382006-03-23 03:00:46 -08002066 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 return NULL;
2068}
2069
2070static unsigned long mod_find_symname(struct module *mod, const char *name)
2071{
2072 unsigned int i;
2073
2074 for (i = 0; i < mod->num_symtab; i++)
Keith Owens54e8ce42006-02-03 03:03:53 -08002075 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2076 mod->symtab[i].st_info != 'U')
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077 return mod->symtab[i].st_value;
2078 return 0;
2079}
2080
2081/* Look for this name: can be of form module:name. */
2082unsigned long module_kallsyms_lookup_name(const char *name)
2083{
2084 struct module *mod;
2085 char *colon;
2086 unsigned long ret = 0;
2087
2088 /* Don't lock: we're in enough trouble already. */
2089 if ((colon = strchr(name, ':')) != NULL) {
2090 *colon = '\0';
2091 if ((mod = find_module(name)) != NULL)
2092 ret = mod_find_symname(mod, colon+1);
2093 *colon = ':';
2094 } else {
2095 list_for_each_entry(mod, &modules, list)
2096 if ((ret = mod_find_symname(mod, name)) != 0)
2097 break;
2098 }
2099 return ret;
2100}
2101#endif /* CONFIG_KALLSYMS */
2102
2103/* Called by the /proc file system to return a list of modules. */
2104static void *m_start(struct seq_file *m, loff_t *pos)
2105{
2106 struct list_head *i;
2107 loff_t n = 0;
2108
Ashutosh Naik6389a382006-03-23 03:00:46 -08002109 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 list_for_each(i, &modules) {
2111 if (n++ == *pos)
2112 break;
2113 }
2114 if (i == &modules)
2115 return NULL;
2116 return i;
2117}
2118
2119static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2120{
2121 struct list_head *i = p;
2122 (*pos)++;
2123 if (i->next == &modules)
2124 return NULL;
2125 return i->next;
2126}
2127
2128static void m_stop(struct seq_file *m, void *p)
2129{
Ashutosh Naik6389a382006-03-23 03:00:46 -08002130 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131}
2132
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002133static char *taint_flags(unsigned int taints, char *buf)
2134{
2135 int bx = 0;
2136
2137 if (taints) {
2138 buf[bx++] = '(';
2139 if (taints & TAINT_PROPRIETARY_MODULE)
2140 buf[bx++] = 'P';
2141 if (taints & TAINT_FORCED_MODULE)
2142 buf[bx++] = 'F';
2143 /*
2144 * TAINT_FORCED_RMMOD: could be added.
2145 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2146 * apply to modules.
2147 */
2148 buf[bx++] = ')';
2149 }
2150 buf[bx] = '\0';
2151
2152 return buf;
2153}
2154
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155static int m_show(struct seq_file *m, void *p)
2156{
2157 struct module *mod = list_entry(p, struct module, list);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002158 char buf[8];
2159
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160 seq_printf(m, "%s %lu",
2161 mod->name, mod->init_size + mod->core_size);
2162 print_unload_info(m, mod);
2163
2164 /* Informative for users. */
2165 seq_printf(m, " %s",
2166 mod->state == MODULE_STATE_GOING ? "Unloading":
2167 mod->state == MODULE_STATE_COMING ? "Loading":
2168 "Live");
2169 /* Used by oprofile and other similar tools. */
2170 seq_printf(m, " 0x%p", mod->module_core);
2171
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002172 /* Taints info */
2173 if (mod->taints)
2174 seq_printf(m, " %s", taint_flags(mod->taints, buf));
2175
Linus Torvalds1da177e2005-04-16 15:20:36 -07002176 seq_printf(m, "\n");
2177 return 0;
2178}
2179
2180/* Format: modulename size refcount deps address
2181
2182 Where refcount is a number or -, and deps is a comma-separated list
2183 of depends or -.
2184*/
2185struct seq_operations modules_op = {
2186 .start = m_start,
2187 .next = m_next,
2188 .stop = m_stop,
2189 .show = m_show
2190};
2191
2192/* Given an address, look for it in the module exception tables. */
2193const struct exception_table_entry *search_module_extables(unsigned long addr)
2194{
2195 unsigned long flags;
2196 const struct exception_table_entry *e = NULL;
2197 struct module *mod;
2198
2199 spin_lock_irqsave(&modlist_lock, flags);
2200 list_for_each_entry(mod, &modules, list) {
2201 if (mod->num_exentries == 0)
2202 continue;
2203
2204 e = search_extable(mod->extable,
2205 mod->extable + mod->num_exentries - 1,
2206 addr);
2207 if (e)
2208 break;
2209 }
2210 spin_unlock_irqrestore(&modlist_lock, flags);
2211
2212 /* Now, if we found one, we are running inside it now, hence
2213 we cannot unload the module, hence no refcnt needed. */
2214 return e;
2215}
2216
Ingo Molnar4d435f92006-07-03 00:24:24 -07002217/*
2218 * Is this a valid module address?
2219 */
2220int is_module_address(unsigned long addr)
2221{
2222 unsigned long flags;
2223 struct module *mod;
2224
2225 spin_lock_irqsave(&modlist_lock, flags);
2226
2227 list_for_each_entry(mod, &modules, list) {
2228 if (within(addr, mod->module_core, mod->core_size)) {
2229 spin_unlock_irqrestore(&modlist_lock, flags);
2230 return 1;
2231 }
2232 }
2233
2234 spin_unlock_irqrestore(&modlist_lock, flags);
2235
2236 return 0;
2237}
2238
2239
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240/* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2241struct module *__module_text_address(unsigned long addr)
2242{
2243 struct module *mod;
2244
2245 list_for_each_entry(mod, &modules, list)
2246 if (within(addr, mod->module_init, mod->init_text_size)
2247 || within(addr, mod->module_core, mod->core_text_size))
2248 return mod;
2249 return NULL;
2250}
2251
2252struct module *module_text_address(unsigned long addr)
2253{
2254 struct module *mod;
2255 unsigned long flags;
2256
2257 spin_lock_irqsave(&modlist_lock, flags);
2258 mod = __module_text_address(addr);
2259 spin_unlock_irqrestore(&modlist_lock, flags);
2260
2261 return mod;
2262}
2263
2264/* Don't grab lock, we're oopsing. */
2265void print_modules(void)
2266{
2267 struct module *mod;
Randy Dunlap2bc2d612006-10-02 02:17:02 -07002268 char buf[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269
2270 printk("Modules linked in:");
2271 list_for_each_entry(mod, &modules, list)
Randy Dunlap2bc2d612006-10-02 02:17:02 -07002272 printk(" %s%s", mod->name, taint_flags(mod->taints, buf));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002273 printk("\n");
2274}
2275
2276void module_add_driver(struct module *mod, struct device_driver *drv)
2277{
2278 if (!mod || !drv)
2279 return;
2280
2281 /* Don't check return code; this call is idempotent */
2282 sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module");
2283}
2284EXPORT_SYMBOL(module_add_driver);
2285
2286void module_remove_driver(struct device_driver *drv)
2287{
2288 if (!drv)
2289 return;
2290 sysfs_remove_link(&drv->kobj, "module");
2291}
2292EXPORT_SYMBOL(module_remove_driver);
2293
2294#ifdef CONFIG_MODVERSIONS
2295/* Generate the signature for struct module here, too, for modversions. */
2296void struct_module(struct module *mod) { return; }
2297EXPORT_SYMBOL(struct_module);
2298#endif