blob: dc04d4d88d02afffbe088fab748427adbb00c50b [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>
Alexey Dobriyanae84e322007-05-08 00:28:38 -070022#include <linux/kallsyms.h>
Roland McGrath6d760132007-10-16 23:26:40 -070023#include <linux/sysfs.h>
Randy Dunlap9f158332005-09-13 01:25:16 -070024#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/slab.h>
26#include <linux/vmalloc.h>
27#include <linux/elf.h>
28#include <linux/seq_file.h>
29#include <linux/syscalls.h>
30#include <linux/fcntl.h>
31#include <linux/rcupdate.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080032#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/cpu.h>
34#include <linux/moduleparam.h>
35#include <linux/errno.h>
36#include <linux/err.h>
37#include <linux/vermagic.h>
38#include <linux/notifier.h>
Al Virof6a57032006-10-18 01:47:25 -040039#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/stop_machine.h>
41#include <linux/device.h>
Matt Domschc988d2b2005-06-23 22:05:15 -070042#include <linux/string.h>
Arjan van de Ven97d1f152006-03-23 03:00:24 -080043#include <linux/mutex.h>
Jan Beulich4552d5d2006-06-26 13:57:28 +020044#include <linux/unwind.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <asm/uaccess.h>
46#include <asm/semaphore.h>
47#include <asm/cacheflush.h>
Sam Ravnborgb817f6f2006-06-09 21:53:55 +020048#include <linux/license.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50#if 0
51#define DEBUGP printk
52#else
53#define DEBUGP(fmt , a...)
54#endif
55
56#ifndef ARCH_SHF_SMALL
57#define ARCH_SHF_SMALL 0
58#endif
59
60/* If this is set, the section belongs in the init part of the module */
61#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
62
Rusty Russell24da1cb2007-07-15 23:41:46 -070063/* List of modules, protected by module_mutex or preempt_disable
64 * (add/delete uses stop_machine). */
Ashutosh Naik6389a382006-03-23 03:00:46 -080065static DEFINE_MUTEX(module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066static LIST_HEAD(modules);
67
Rusty Russellc9a3ba52008-01-29 17:13:18 -050068/* Waiting for a module to finish initializing? */
69static DECLARE_WAIT_QUEUE_HEAD(module_wq);
70
Alan Sterne041c682006-03-27 01:16:30 -080071static BLOCKING_NOTIFIER_HEAD(module_notify_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73int register_module_notifier(struct notifier_block * nb)
74{
Alan Sterne041c682006-03-27 01:16:30 -080075 return blocking_notifier_chain_register(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77EXPORT_SYMBOL(register_module_notifier);
78
79int unregister_module_notifier(struct notifier_block * nb)
80{
Alan Sterne041c682006-03-27 01:16:30 -080081 return blocking_notifier_chain_unregister(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082}
83EXPORT_SYMBOL(unregister_module_notifier);
84
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -080085/* We require a truly strong try_module_get(): 0 means failure due to
86 ongoing or failed initialization etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087static inline int strong_try_module_get(struct module *mod)
88{
89 if (mod && mod->state == MODULE_STATE_COMING)
Rusty Russellc9a3ba52008-01-29 17:13:18 -050090 return -EBUSY;
91 if (try_module_get(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 return 0;
Rusty Russellc9a3ba52008-01-29 17:13:18 -050093 else
94 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
96
Florin Malitafa3ba2e82006-10-11 01:21:48 -070097static inline void add_taint_module(struct module *mod, unsigned flag)
98{
99 add_taint(flag);
100 mod->taints |= flag;
101}
102
Robert P. J. Day02a3e592007-05-09 07:26:28 +0200103/*
104 * A thread that wants to hold a reference to a module only while it
105 * is running can call this to safely exit. nfsd and lockd use this.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 */
107void __module_put_and_exit(struct module *mod, long code)
108{
109 module_put(mod);
110 do_exit(code);
111}
112EXPORT_SYMBOL(__module_put_and_exit);
Daniel Walker22a8bde2007-10-18 03:06:07 -0700113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114/* Find a module section: 0 means not found. */
115static unsigned int find_sec(Elf_Ehdr *hdr,
116 Elf_Shdr *sechdrs,
117 const char *secstrings,
118 const char *name)
119{
120 unsigned int i;
121
122 for (i = 1; i < hdr->e_shnum; i++)
123 /* Alloc bit cleared means "ignore it." */
124 if ((sechdrs[i].sh_flags & SHF_ALLOC)
125 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
126 return i;
127 return 0;
128}
129
130/* Provided by the linker */
131extern const struct kernel_symbol __start___ksymtab[];
132extern const struct kernel_symbol __stop___ksymtab[];
133extern const struct kernel_symbol __start___ksymtab_gpl[];
134extern const struct kernel_symbol __stop___ksymtab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800135extern const struct kernel_symbol __start___ksymtab_gpl_future[];
136extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700137extern const struct kernel_symbol __start___ksymtab_unused[];
138extern const struct kernel_symbol __stop___ksymtab_unused[];
139extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
140extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
141extern const struct kernel_symbol __start___ksymtab_gpl_future[];
142extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143extern const unsigned long __start___kcrctab[];
144extern const unsigned long __start___kcrctab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800145extern const unsigned long __start___kcrctab_gpl_future[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700146extern const unsigned long __start___kcrctab_unused[];
147extern const unsigned long __start___kcrctab_unused_gpl[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149#ifndef CONFIG_MODVERSIONS
150#define symversion(base, idx) NULL
151#else
Andrew Mortonf83ca9f2006-03-28 01:56:20 -0800152#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153#endif
154
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100155/* lookup symbol in given range of kernel_symbols */
156static const struct kernel_symbol *lookup_symbol(const char *name,
157 const struct kernel_symbol *start,
158 const struct kernel_symbol *stop)
159{
160 const struct kernel_symbol *ks = start;
161 for (; ks < stop; ks++)
162 if (strcmp(ks->name, name) == 0)
163 return ks;
164 return NULL;
165}
166
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700167static void printk_unused_warning(const char *name)
168{
169 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
170 "however this module is using it.\n", name);
171 printk(KERN_WARNING "This symbol will go away in the future.\n");
172 printk(KERN_WARNING "Please evalute if this is the right api to use, "
173 "and if it really is, submit a report the linux kernel "
174 "mailinglist together with submitting your code for "
175 "inclusion.\n");
176}
177
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178/* Find a symbol, return value, crc and module which owns it */
179static unsigned long __find_symbol(const char *name,
180 struct module **owner,
181 const unsigned long **crc,
182 int gplok)
183{
184 struct module *mod;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100185 const struct kernel_symbol *ks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Daniel Walker22a8bde2007-10-18 03:06:07 -0700187 /* Core kernel first. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 *owner = NULL;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100189 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
190 if (ks) {
191 *crc = symversion(__start___kcrctab, (ks - __start___ksymtab));
192 return ks->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 }
194 if (gplok) {
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100195 ks = lookup_symbol(name, __start___ksymtab_gpl,
196 __stop___ksymtab_gpl);
197 if (ks) {
198 *crc = symversion(__start___kcrctab_gpl,
199 (ks - __start___ksymtab_gpl));
200 return ks->value;
201 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 }
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800203 ks = lookup_symbol(name, __start___ksymtab_gpl_future,
204 __stop___ksymtab_gpl_future);
205 if (ks) {
206 if (!gplok) {
207 printk(KERN_WARNING "Symbol %s is being used "
208 "by a non-GPL module, which will not "
209 "be allowed in the future\n", name);
210 printk(KERN_WARNING "Please see the file "
211 "Documentation/feature-removal-schedule.txt "
212 "in the kernel source tree for more "
213 "details.\n");
214 }
215 *crc = symversion(__start___kcrctab_gpl_future,
216 (ks - __start___ksymtab_gpl_future));
217 return ks->value;
218 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700220 ks = lookup_symbol(name, __start___ksymtab_unused,
221 __stop___ksymtab_unused);
222 if (ks) {
223 printk_unused_warning(name);
224 *crc = symversion(__start___kcrctab_unused,
225 (ks - __start___ksymtab_unused));
226 return ks->value;
227 }
228
229 if (gplok)
230 ks = lookup_symbol(name, __start___ksymtab_unused_gpl,
231 __stop___ksymtab_unused_gpl);
232 if (ks) {
233 printk_unused_warning(name);
234 *crc = symversion(__start___kcrctab_unused_gpl,
235 (ks - __start___ksymtab_unused_gpl));
236 return ks->value;
237 }
238
Daniel Walker22a8bde2007-10-18 03:06:07 -0700239 /* Now try modules. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 list_for_each_entry(mod, &modules, list) {
241 *owner = mod;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100242 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
243 if (ks) {
244 *crc = symversion(mod->crcs, (ks - mod->syms));
245 return ks->value;
246 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248 if (gplok) {
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100249 ks = lookup_symbol(name, mod->gpl_syms,
250 mod->gpl_syms + mod->num_gpl_syms);
251 if (ks) {
252 *crc = symversion(mod->gpl_crcs,
253 (ks - mod->gpl_syms));
254 return ks->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 }
256 }
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700257 ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms);
258 if (ks) {
259 printk_unused_warning(name);
260 *crc = symversion(mod->unused_crcs, (ks - mod->unused_syms));
261 return ks->value;
262 }
263
264 if (gplok) {
265 ks = lookup_symbol(name, mod->unused_gpl_syms,
266 mod->unused_gpl_syms + mod->num_unused_gpl_syms);
267 if (ks) {
268 printk_unused_warning(name);
269 *crc = symversion(mod->unused_gpl_crcs,
270 (ks - mod->unused_gpl_syms));
271 return ks->value;
272 }
273 }
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800274 ks = lookup_symbol(name, mod->gpl_future_syms,
275 (mod->gpl_future_syms +
276 mod->num_gpl_future_syms));
277 if (ks) {
278 if (!gplok) {
279 printk(KERN_WARNING "Symbol %s is being used "
280 "by a non-GPL module, which will not "
281 "be allowed in the future\n", name);
282 printk(KERN_WARNING "Please see the file "
283 "Documentation/feature-removal-schedule.txt "
284 "in the kernel source tree for more "
285 "details.\n");
286 }
287 *crc = symversion(mod->gpl_future_crcs,
288 (ks - mod->gpl_future_syms));
289 return ks->value;
290 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 }
292 DEBUGP("Failed to find symbol %s\n", name);
Christoph Lameter88173502008-02-08 04:18:41 -0800293 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296/* Search for module by name: must hold module_mutex. */
297static struct module *find_module(const char *name)
298{
299 struct module *mod;
300
301 list_for_each_entry(mod, &modules, list) {
302 if (strcmp(mod->name, name) == 0)
303 return mod;
304 }
305 return NULL;
306}
307
308#ifdef CONFIG_SMP
309/* Number of blocks used and allocated. */
310static unsigned int pcpu_num_used, pcpu_num_allocated;
311/* Size of each block. -ve means used. */
312static int *pcpu_size;
313
314static int split_block(unsigned int i, unsigned short size)
315{
316 /* Reallocation required? */
317 if (pcpu_num_used + 1 > pcpu_num_allocated) {
Pekka Enberg6d4f9c52007-05-08 00:24:58 -0700318 int *new;
319
320 new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
321 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 if (!new)
323 return 0;
324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 pcpu_num_allocated *= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 pcpu_size = new;
327 }
328
329 /* Insert a new subblock */
330 memmove(&pcpu_size[i+1], &pcpu_size[i],
331 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
332 pcpu_num_used++;
333
334 pcpu_size[i+1] -= size;
335 pcpu_size[i] = size;
336 return 1;
337}
338
339static inline unsigned int block_size(int val)
340{
341 if (val < 0)
342 return -val;
343 return val;
344}
345
346/* Created by linker magic */
347extern char __per_cpu_start[], __per_cpu_end[];
348
Rusty Russell842bbaa2005-08-01 21:11:47 -0700349static void *percpu_modalloc(unsigned long size, unsigned long align,
350 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
352 unsigned long extra;
353 unsigned int i;
354 void *ptr;
355
Jeremy Fitzhardingeb6e35902007-05-02 19:27:12 +0200356 if (align > PAGE_SIZE) {
357 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
358 name, align, PAGE_SIZE);
359 align = PAGE_SIZE;
Rusty Russell842bbaa2005-08-01 21:11:47 -0700360 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 ptr = __per_cpu_start;
363 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
364 /* Extra for alignment requirement. */
365 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
366 BUG_ON(i == 0 && extra != 0);
367
368 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
369 continue;
370
371 /* Transfer extra to previous block. */
372 if (pcpu_size[i-1] < 0)
373 pcpu_size[i-1] -= extra;
374 else
375 pcpu_size[i-1] += extra;
376 pcpu_size[i] -= extra;
377 ptr += extra;
378
379 /* Split block if warranted */
380 if (pcpu_size[i] - size > sizeof(unsigned long))
381 if (!split_block(i, size))
382 return NULL;
383
384 /* Mark allocated */
385 pcpu_size[i] = -pcpu_size[i];
386 return ptr;
387 }
388
389 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
390 size);
391 return NULL;
392}
393
394static void percpu_modfree(void *freeme)
395{
396 unsigned int i;
397 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
398
399 /* First entry is core kernel percpu data. */
400 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
401 if (ptr == freeme) {
402 pcpu_size[i] = -pcpu_size[i];
403 goto free;
404 }
405 }
406 BUG();
407
408 free:
409 /* Merge with previous? */
410 if (pcpu_size[i-1] >= 0) {
411 pcpu_size[i-1] += pcpu_size[i];
412 pcpu_num_used--;
413 memmove(&pcpu_size[i], &pcpu_size[i+1],
414 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
415 i--;
416 }
417 /* Merge with next? */
418 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
419 pcpu_size[i] += pcpu_size[i+1];
420 pcpu_num_used--;
421 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
422 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
423 }
424}
425
426static unsigned int find_pcpusec(Elf_Ehdr *hdr,
427 Elf_Shdr *sechdrs,
428 const char *secstrings)
429{
430 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
431}
432
Mike Travisdd5af902008-01-30 13:33:32 +0100433static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
434{
435 int cpu;
436
437 for_each_possible_cpu(cpu)
438 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
439}
440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441static int percpu_modinit(void)
442{
443 pcpu_num_used = 2;
444 pcpu_num_allocated = 2;
445 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
446 GFP_KERNEL);
447 /* Static in-kernel percpu data (used). */
Jeremy Fitzhardingeb00742d32007-05-02 19:27:11 +0200448 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 /* Free room. */
450 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
451 if (pcpu_size[1] < 0) {
452 printk(KERN_ERR "No per-cpu room for modules.\n");
453 pcpu_num_used = 1;
454 }
455
456 return 0;
Daniel Walker22a8bde2007-10-18 03:06:07 -0700457}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458__initcall(percpu_modinit);
459#else /* ... !CONFIG_SMP */
Rusty Russell842bbaa2005-08-01 21:11:47 -0700460static inline void *percpu_modalloc(unsigned long size, unsigned long align,
461 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
463 return NULL;
464}
465static inline void percpu_modfree(void *pcpuptr)
466{
467 BUG();
468}
469static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
470 Elf_Shdr *sechdrs,
471 const char *secstrings)
472{
473 return 0;
474}
475static inline void percpu_modcopy(void *pcpudst, const void *src,
476 unsigned long size)
477{
478 /* pcpusec should be 0, and size of that section should be 0. */
479 BUG_ON(size != 0);
480}
481#endif /* CONFIG_SMP */
482
Matt Domschc988d2b2005-06-23 22:05:15 -0700483#define MODINFO_ATTR(field) \
484static void setup_modinfo_##field(struct module *mod, const char *s) \
485{ \
486 mod->field = kstrdup(s, GFP_KERNEL); \
487} \
488static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
489 struct module *mod, char *buffer) \
490{ \
491 return sprintf(buffer, "%s\n", mod->field); \
492} \
493static int modinfo_##field##_exists(struct module *mod) \
494{ \
495 return mod->field != NULL; \
496} \
497static void free_modinfo_##field(struct module *mod) \
498{ \
Daniel Walker22a8bde2007-10-18 03:06:07 -0700499 kfree(mod->field); \
500 mod->field = NULL; \
Matt Domschc988d2b2005-06-23 22:05:15 -0700501} \
502static struct module_attribute modinfo_##field = { \
Tejun Heo7b595752007-06-14 03:45:17 +0900503 .attr = { .name = __stringify(field), .mode = 0444 }, \
Matt Domschc988d2b2005-06-23 22:05:15 -0700504 .show = show_modinfo_##field, \
505 .setup = setup_modinfo_##field, \
506 .test = modinfo_##field##_exists, \
507 .free = free_modinfo_##field, \
508};
509
510MODINFO_ATTR(version);
511MODINFO_ATTR(srcversion);
512
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100513static char last_unloaded_module[MODULE_NAME_LEN+1];
514
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800515#ifdef CONFIG_MODULE_UNLOAD
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516/* Init the unload section of the module. */
517static void module_unload_init(struct module *mod)
518{
519 unsigned int i;
520
521 INIT_LIST_HEAD(&mod->modules_which_use_me);
522 for (i = 0; i < NR_CPUS; i++)
523 local_set(&mod->ref[i].count, 0);
524 /* Hold reference count during initialization. */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700525 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 /* Backwards compatibility macros put refcount during init. */
527 mod->waiter = current;
528}
529
530/* modules using other modules */
531struct module_use
532{
533 struct list_head list;
534 struct module *module_which_uses;
535};
536
537/* Does a already use b? */
538static int already_uses(struct module *a, struct module *b)
539{
540 struct module_use *use;
541
542 list_for_each_entry(use, &b->modules_which_use_me, list) {
543 if (use->module_which_uses == a) {
544 DEBUGP("%s uses %s!\n", a->name, b->name);
545 return 1;
546 }
547 }
548 DEBUGP("%s does not use %s!\n", a->name, b->name);
549 return 0;
550}
551
552/* Module a uses b */
553static int use_module(struct module *a, struct module *b)
554{
555 struct module_use *use;
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500556 int no_warn, err;
Kay Sievers270a6c42007-01-18 13:26:15 +0100557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 if (b == NULL || already_uses(a, b)) return 1;
559
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500560 /* If we're interrupted or time out, we fail. */
561 if (wait_event_interruptible_timeout(
562 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
563 30 * HZ) <= 0) {
564 printk("%s: gave up waiting for init of module %s.\n",
565 a->name, b->name);
566 return 0;
567 }
568
569 /* If strong_try_module_get() returned a different error, we fail. */
570 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 return 0;
572
573 DEBUGP("Allocating new usage for %s.\n", a->name);
574 use = kmalloc(sizeof(*use), GFP_ATOMIC);
575 if (!use) {
576 printk("%s: out of memory loading\n", a->name);
577 module_put(b);
578 return 0;
579 }
580
581 use->module_which_uses = a;
582 list_add(&use->list, &b->modules_which_use_me);
Kay Sievers270a6c42007-01-18 13:26:15 +0100583 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 return 1;
585}
586
587/* Clear the unload stuff of the module. */
588static void module_unload_free(struct module *mod)
589{
590 struct module *i;
591
592 list_for_each_entry(i, &modules, list) {
593 struct module_use *use;
594
595 list_for_each_entry(use, &i->modules_which_use_me, list) {
596 if (use->module_which_uses == mod) {
597 DEBUGP("%s unusing %s\n", mod->name, i->name);
598 module_put(i);
599 list_del(&use->list);
600 kfree(use);
Kay Sievers270a6c42007-01-18 13:26:15 +0100601 sysfs_remove_link(i->holders_dir, mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 /* There can be at most one match. */
603 break;
604 }
605 }
606 }
607}
608
609#ifdef CONFIG_MODULE_FORCE_UNLOAD
Akinobu Mitafb169792006-01-08 01:04:29 -0800610static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611{
612 int ret = (flags & O_TRUNC);
613 if (ret)
Akinobu Mitafb169792006-01-08 01:04:29 -0800614 add_taint(TAINT_FORCED_RMMOD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 return ret;
616}
617#else
Akinobu Mitafb169792006-01-08 01:04:29 -0800618static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619{
620 return 0;
621}
622#endif /* CONFIG_MODULE_FORCE_UNLOAD */
623
624struct stopref
625{
626 struct module *mod;
627 int flags;
628 int *forced;
629};
630
631/* Whole machine is stopped with interrupts off when this runs. */
632static int __try_stop_module(void *_sref)
633{
634 struct stopref *sref = _sref;
635
636 /* If it's not unused, quit unless we are told to block. */
637 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800638 if (!(*sref->forced = try_force_unload(sref->flags)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 return -EWOULDBLOCK;
640 }
641
642 /* Mark it as dying. */
643 sref->mod->state = MODULE_STATE_GOING;
644 return 0;
645}
646
647static int try_stop_module(struct module *mod, int flags, int *forced)
648{
649 struct stopref sref = { mod, flags, forced };
650
651 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
652}
653
654unsigned int module_refcount(struct module *mod)
655{
656 unsigned int i, total = 0;
657
658 for (i = 0; i < NR_CPUS; i++)
659 total += local_read(&mod->ref[i].count);
660 return total;
661}
662EXPORT_SYMBOL(module_refcount);
663
664/* This exists whether we can unload or not */
665static void free_module(struct module *mod);
666
667static void wait_for_zero_refcount(struct module *mod)
668{
669 /* Since we might sleep for some time, drop the semaphore first */
Ashutosh Naik6389a382006-03-23 03:00:46 -0800670 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 for (;;) {
672 DEBUGP("Looking at refcount...\n");
673 set_current_state(TASK_UNINTERRUPTIBLE);
674 if (module_refcount(mod) == 0)
675 break;
676 schedule();
677 }
678 current->state = TASK_RUNNING;
Ashutosh Naik6389a382006-03-23 03:00:46 -0800679 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680}
681
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800682asmlinkage long
683sys_delete_module(const char __user *name_user, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684{
685 struct module *mod;
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800686 char name[MODULE_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 int ret, forced = 0;
688
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800689 if (!capable(CAP_SYS_MODULE))
690 return -EPERM;
691
692 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
693 return -EFAULT;
694 name[MODULE_NAME_LEN-1] = '\0';
695
Ashutosh Naik6389a382006-03-23 03:00:46 -0800696 if (mutex_lock_interruptible(&module_mutex) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 return -EINTR;
698
699 mod = find_module(name);
700 if (!mod) {
701 ret = -ENOENT;
702 goto out;
703 }
704
705 if (!list_empty(&mod->modules_which_use_me)) {
706 /* Other modules depend on us: get rid of them first. */
707 ret = -EWOULDBLOCK;
708 goto out;
709 }
710
711 /* Doing init or already dying? */
712 if (mod->state != MODULE_STATE_LIVE) {
713 /* FIXME: if (force), slam module count and wake up
714 waiter --RR */
715 DEBUGP("%s already dying\n", mod->name);
716 ret = -EBUSY;
717 goto out;
718 }
719
720 /* If it has an init func, it must have an exit func to unload */
Rusty Russellaf49d922007-10-16 23:26:27 -0700721 if (mod->init && !mod->exit) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800722 forced = try_force_unload(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 if (!forced) {
724 /* This module can't be removed */
725 ret = -EBUSY;
726 goto out;
727 }
728 }
729
730 /* Set this up before setting mod->state */
731 mod->waiter = current;
732
733 /* Stop the machine so refcounts can't move and disable module. */
734 ret = try_stop_module(mod, flags, &forced);
735 if (ret != 0)
736 goto out;
737
738 /* Never wait if forced. */
739 if (!forced && module_refcount(mod) != 0)
740 wait_for_zero_refcount(mod);
741
742 /* Final destruction now noone is using it. */
743 if (mod->exit != NULL) {
Ashutosh Naik6389a382006-03-23 03:00:46 -0800744 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 mod->exit();
Ashutosh Naik6389a382006-03-23 03:00:46 -0800746 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 }
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100748 /* Store the name of the last unloaded module for diagnostic purposes */
Rusty Russellefa53452008-01-29 17:13:20 -0500749 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 free_module(mod);
751
752 out:
Ashutosh Naik6389a382006-03-23 03:00:46 -0800753 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 return ret;
755}
756
757static void print_unload_info(struct seq_file *m, struct module *mod)
758{
759 struct module_use *use;
760 int printed_something = 0;
761
762 seq_printf(m, " %u ", module_refcount(mod));
763
764 /* Always include a trailing , so userspace can differentiate
765 between this and the old multi-field proc format. */
766 list_for_each_entry(use, &mod->modules_which_use_me, list) {
767 printed_something = 1;
768 seq_printf(m, "%s,", use->module_which_uses->name);
769 }
770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 if (mod->init != NULL && mod->exit == NULL) {
772 printed_something = 1;
773 seq_printf(m, "[permanent],");
774 }
775
776 if (!printed_something)
777 seq_printf(m, "-");
778}
779
780void __symbol_put(const char *symbol)
781{
782 struct module *owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 const unsigned long *crc;
784
Rusty Russell24da1cb2007-07-15 23:41:46 -0700785 preempt_disable();
Christoph Lameter88173502008-02-08 04:18:41 -0800786 if (IS_ERR_VALUE(__find_symbol(symbol, &owner, &crc, 1)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 BUG();
788 module_put(owner);
Rusty Russell24da1cb2007-07-15 23:41:46 -0700789 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790}
791EXPORT_SYMBOL(__symbol_put);
792
793void symbol_put_addr(void *addr)
794{
Trent Piepho5e376612006-05-15 09:44:06 -0700795 struct module *modaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Trent Piepho5e376612006-05-15 09:44:06 -0700797 if (core_kernel_text((unsigned long)addr))
798 return;
799
800 if (!(modaddr = module_text_address((unsigned long)addr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 BUG();
Trent Piepho5e376612006-05-15 09:44:06 -0700802 module_put(modaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803}
804EXPORT_SYMBOL_GPL(symbol_put_addr);
805
806static ssize_t show_refcnt(struct module_attribute *mattr,
807 struct module *mod, char *buffer)
808{
Alexey Dobriyan256e2fd2007-08-06 23:47:45 +0400809 return sprintf(buffer, "%u\n", module_refcount(mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810}
811
812static struct module_attribute refcnt = {
Tejun Heo7b595752007-06-14 03:45:17 +0900813 .attr = { .name = "refcnt", .mode = 0444 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 .show = show_refcnt,
815};
816
Al Virof6a57032006-10-18 01:47:25 -0400817void module_put(struct module *module)
818{
819 if (module) {
820 unsigned int cpu = get_cpu();
821 local_dec(&module->ref[cpu].count);
822 /* Maybe they're waiting for us to drop reference? */
823 if (unlikely(!module_is_live(module)))
824 wake_up_process(module->waiter);
825 put_cpu();
826 }
827}
828EXPORT_SYMBOL(module_put);
829
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830#else /* !CONFIG_MODULE_UNLOAD */
831static void print_unload_info(struct seq_file *m, struct module *mod)
832{
833 /* We don't know the usage count, or what modules are using. */
834 seq_printf(m, " - -");
835}
836
837static inline void module_unload_free(struct module *mod)
838{
839}
840
841static inline int use_module(struct module *a, struct module *b)
842{
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500843 return strong_try_module_get(b) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844}
845
846static inline void module_unload_init(struct module *mod)
847{
848}
849#endif /* CONFIG_MODULE_UNLOAD */
850
Kay Sievers1f717402006-11-24 12:15:25 +0100851static ssize_t show_initstate(struct module_attribute *mattr,
852 struct module *mod, char *buffer)
853{
854 const char *state = "unknown";
855
856 switch (mod->state) {
857 case MODULE_STATE_LIVE:
858 state = "live";
859 break;
860 case MODULE_STATE_COMING:
861 state = "coming";
862 break;
863 case MODULE_STATE_GOING:
864 state = "going";
865 break;
866 }
867 return sprintf(buffer, "%s\n", state);
868}
869
870static struct module_attribute initstate = {
Tejun Heo7b595752007-06-14 03:45:17 +0900871 .attr = { .name = "initstate", .mode = 0444 },
Kay Sievers1f717402006-11-24 12:15:25 +0100872 .show = show_initstate,
873};
874
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800875static struct module_attribute *modinfo_attrs[] = {
876 &modinfo_version,
877 &modinfo_srcversion,
Kay Sievers1f717402006-11-24 12:15:25 +0100878 &initstate,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800879#ifdef CONFIG_MODULE_UNLOAD
880 &refcnt,
881#endif
882 NULL,
883};
884
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885static const char vermagic[] = VERMAGIC_STRING;
886
887#ifdef CONFIG_MODVERSIONS
888static int check_version(Elf_Shdr *sechdrs,
889 unsigned int versindex,
890 const char *symname,
891 struct module *mod,
892 const unsigned long *crc)
893{
894 unsigned int i, num_versions;
895 struct modversion_info *versions;
896
897 /* Exporting module didn't supply crcs? OK, we're already tainted. */
898 if (!crc)
899 return 1;
900
901 versions = (void *) sechdrs[versindex].sh_addr;
902 num_versions = sechdrs[versindex].sh_size
903 / sizeof(struct modversion_info);
904
905 for (i = 0; i < num_versions; i++) {
906 if (strcmp(versions[i].name, symname) != 0)
907 continue;
908
909 if (versions[i].crc == *crc)
910 return 1;
911 printk("%s: disagrees about version of symbol %s\n",
912 mod->name, symname);
913 DEBUGP("Found checksum %lX vs module %lX\n",
914 *crc, versions[i].crc);
915 return 0;
916 }
917 /* Not in module's version table. OK, but that taints the kernel. */
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700918 if (!(tainted & TAINT_FORCED_MODULE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 printk("%s: no version for \"%s\" found: kernel tainted.\n",
920 mod->name, symname);
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700921 add_taint_module(mod, TAINT_FORCED_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 return 1;
923}
924
925static inline int check_modstruct_version(Elf_Shdr *sechdrs,
926 unsigned int versindex,
927 struct module *mod)
928{
929 const unsigned long *crc;
930 struct module *owner;
931
Christoph Lameter88173502008-02-08 04:18:41 -0800932 if (IS_ERR_VALUE(__find_symbol("struct_module",
933 &owner, &crc, 1)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 BUG();
935 return check_version(sechdrs, versindex, "struct_module", mod,
936 crc);
937}
938
939/* First part is kernel version, which we ignore. */
940static inline int same_magic(const char *amagic, const char *bmagic)
941{
942 amagic += strcspn(amagic, " ");
943 bmagic += strcspn(bmagic, " ");
944 return strcmp(amagic, bmagic) == 0;
945}
946#else
947static inline int check_version(Elf_Shdr *sechdrs,
948 unsigned int versindex,
949 const char *symname,
950 struct module *mod,
951 const unsigned long *crc)
952{
953 return 1;
954}
955
956static inline int check_modstruct_version(Elf_Shdr *sechdrs,
957 unsigned int versindex,
958 struct module *mod)
959{
960 return 1;
961}
962
963static inline int same_magic(const char *amagic, const char *bmagic)
964{
965 return strcmp(amagic, bmagic) == 0;
966}
967#endif /* CONFIG_MODVERSIONS */
968
969/* Resolve a symbol for this module. I.e. if we find one, record usage.
970 Must be holding module_mutex. */
971static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
972 unsigned int versindex,
973 const char *name,
974 struct module *mod)
975{
976 struct module *owner;
977 unsigned long ret;
978 const unsigned long *crc;
979
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700980 ret = __find_symbol(name, &owner, &crc,
981 !(mod->taints & TAINT_PROPRIETARY_MODULE));
Christoph Lameter88173502008-02-08 04:18:41 -0800982 if (!IS_ERR_VALUE(ret)) {
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -0800983 /* use_module can fail due to OOM,
984 or module initialization or unloading */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 if (!check_version(sechdrs, versindex, name, mod, crc) ||
986 !use_module(mod, owner))
Christoph Lameter88173502008-02-08 04:18:41 -0800987 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 return ret;
990}
991
992
993/*
994 * /sys/module/foo/sections stuff
995 * J. Corbet <corbet@lwn.net>
996 */
997#ifdef CONFIG_KALLSYMS
998static ssize_t module_sect_show(struct module_attribute *mattr,
999 struct module *mod, char *buf)
1000{
1001 struct module_sect_attr *sattr =
1002 container_of(mattr, struct module_sect_attr, mattr);
1003 return sprintf(buf, "0x%lx\n", sattr->address);
1004}
1005
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001006static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1007{
1008 int section;
1009
1010 for (section = 0; section < sect_attrs->nsections; section++)
1011 kfree(sect_attrs->attrs[section].name);
1012 kfree(sect_attrs);
1013}
1014
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015static void add_sect_attrs(struct module *mod, unsigned int nsect,
1016 char *secstrings, Elf_Shdr *sechdrs)
1017{
1018 unsigned int nloaded = 0, i, size[2];
1019 struct module_sect_attrs *sect_attrs;
1020 struct module_sect_attr *sattr;
1021 struct attribute **gattr;
Daniel Walker22a8bde2007-10-18 03:06:07 -07001022
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 /* Count loaded sections and allocate structures */
1024 for (i = 0; i < nsect; i++)
1025 if (sechdrs[i].sh_flags & SHF_ALLOC)
1026 nloaded++;
1027 size[0] = ALIGN(sizeof(*sect_attrs)
1028 + nloaded * sizeof(sect_attrs->attrs[0]),
1029 sizeof(sect_attrs->grp.attrs[0]));
1030 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001031 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1032 if (sect_attrs == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 return;
1034
1035 /* Setup section attributes. */
1036 sect_attrs->grp.name = "sections";
1037 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1038
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001039 sect_attrs->nsections = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 sattr = &sect_attrs->attrs[0];
1041 gattr = &sect_attrs->grp.attrs[0];
1042 for (i = 0; i < nsect; i++) {
1043 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1044 continue;
1045 sattr->address = sechdrs[i].sh_addr;
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001046 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1047 GFP_KERNEL);
1048 if (sattr->name == NULL)
1049 goto out;
1050 sect_attrs->nsections++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 sattr->mattr.show = module_sect_show;
1052 sattr->mattr.store = NULL;
1053 sattr->mattr.attr.name = sattr->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 sattr->mattr.attr.mode = S_IRUGO;
1055 *(gattr++) = &(sattr++)->mattr.attr;
1056 }
1057 *gattr = NULL;
1058
1059 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1060 goto out;
1061
1062 mod->sect_attrs = sect_attrs;
1063 return;
1064 out:
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001065 free_sect_attrs(sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066}
1067
1068static void remove_sect_attrs(struct module *mod)
1069{
1070 if (mod->sect_attrs) {
1071 sysfs_remove_group(&mod->mkobj.kobj,
1072 &mod->sect_attrs->grp);
1073 /* We are positive that no one is using any sect attrs
1074 * at this point. Deallocate immediately. */
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001075 free_sect_attrs(mod->sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 mod->sect_attrs = NULL;
1077 }
1078}
1079
Roland McGrath6d760132007-10-16 23:26:40 -07001080/*
1081 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1082 */
1083
1084struct module_notes_attrs {
1085 struct kobject *dir;
1086 unsigned int notes;
1087 struct bin_attribute attrs[0];
1088};
1089
1090static ssize_t module_notes_read(struct kobject *kobj,
1091 struct bin_attribute *bin_attr,
1092 char *buf, loff_t pos, size_t count)
1093{
1094 /*
1095 * The caller checked the pos and count against our size.
1096 */
1097 memcpy(buf, bin_attr->private + pos, count);
1098 return count;
1099}
1100
1101static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1102 unsigned int i)
1103{
1104 if (notes_attrs->dir) {
1105 while (i-- > 0)
1106 sysfs_remove_bin_file(notes_attrs->dir,
1107 &notes_attrs->attrs[i]);
1108 kobject_del(notes_attrs->dir);
1109 }
1110 kfree(notes_attrs);
1111}
1112
1113static void add_notes_attrs(struct module *mod, unsigned int nsect,
1114 char *secstrings, Elf_Shdr *sechdrs)
1115{
1116 unsigned int notes, loaded, i;
1117 struct module_notes_attrs *notes_attrs;
1118 struct bin_attribute *nattr;
1119
1120 /* Count notes sections and allocate structures. */
1121 notes = 0;
1122 for (i = 0; i < nsect; i++)
1123 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1124 (sechdrs[i].sh_type == SHT_NOTE))
1125 ++notes;
1126
1127 if (notes == 0)
1128 return;
1129
1130 notes_attrs = kzalloc(sizeof(*notes_attrs)
1131 + notes * sizeof(notes_attrs->attrs[0]),
1132 GFP_KERNEL);
1133 if (notes_attrs == NULL)
1134 return;
1135
1136 notes_attrs->notes = notes;
1137 nattr = &notes_attrs->attrs[0];
1138 for (loaded = i = 0; i < nsect; ++i) {
1139 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1140 continue;
1141 if (sechdrs[i].sh_type == SHT_NOTE) {
1142 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1143 nattr->attr.mode = S_IRUGO;
1144 nattr->size = sechdrs[i].sh_size;
1145 nattr->private = (void *) sechdrs[i].sh_addr;
1146 nattr->read = module_notes_read;
1147 ++nattr;
1148 }
1149 ++loaded;
1150 }
1151
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001152 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
Roland McGrath6d760132007-10-16 23:26:40 -07001153 if (!notes_attrs->dir)
1154 goto out;
1155
1156 for (i = 0; i < notes; ++i)
1157 if (sysfs_create_bin_file(notes_attrs->dir,
1158 &notes_attrs->attrs[i]))
1159 goto out;
1160
1161 mod->notes_attrs = notes_attrs;
1162 return;
1163
1164 out:
1165 free_notes_attrs(notes_attrs, i);
1166}
1167
1168static void remove_notes_attrs(struct module *mod)
1169{
1170 if (mod->notes_attrs)
1171 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1172}
1173
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174#else
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001175
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1177 char *sectstrings, Elf_Shdr *sechdrs)
1178{
1179}
1180
1181static inline void remove_sect_attrs(struct module *mod)
1182{
1183}
Roland McGrath6d760132007-10-16 23:26:40 -07001184
1185static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1186 char *sectstrings, Elf_Shdr *sechdrs)
1187{
1188}
1189
1190static inline void remove_notes_attrs(struct module *mod)
1191{
1192}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193#endif /* CONFIG_KALLSYMS */
1194
Randy Dunlapef665c12007-02-13 15:19:06 -08001195#ifdef CONFIG_SYSFS
1196int module_add_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001197{
1198 struct module_attribute *attr;
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001199 struct module_attribute *temp_attr;
Matt Domschc988d2b2005-06-23 22:05:15 -07001200 int error = 0;
1201 int i;
1202
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001203 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1204 (ARRAY_SIZE(modinfo_attrs) + 1)),
1205 GFP_KERNEL);
1206 if (!mod->modinfo_attrs)
1207 return -ENOMEM;
1208
1209 temp_attr = mod->modinfo_attrs;
Matt Domschc988d2b2005-06-23 22:05:15 -07001210 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1211 if (!attr->test ||
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001212 (attr->test && attr->test(mod))) {
1213 memcpy(temp_attr, attr, sizeof(*temp_attr));
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001214 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1215 ++temp_attr;
1216 }
Matt Domschc988d2b2005-06-23 22:05:15 -07001217 }
1218 return error;
1219}
1220
Randy Dunlapef665c12007-02-13 15:19:06 -08001221void module_remove_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001222{
1223 struct module_attribute *attr;
1224 int i;
1225
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001226 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1227 /* pick a field to test for end of list */
1228 if (!attr->attr.name)
1229 break;
Matt Domschc988d2b2005-06-23 22:05:15 -07001230 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001231 if (attr->free)
1232 attr->free(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001233 }
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001234 kfree(mod->modinfo_attrs);
Matt Domschc988d2b2005-06-23 22:05:15 -07001235}
Randy Dunlapef665c12007-02-13 15:19:06 -08001236#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237
Randy Dunlapef665c12007-02-13 15:19:06 -08001238#ifdef CONFIG_SYSFS
1239int mod_sysfs_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240{
1241 int err;
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001242 struct kobject *kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -07001244 if (!module_sysfs_initialized) {
1245 printk(KERN_ERR "%s: module sysfs not initialized\n",
Ed Swierk1cc5f712006-09-25 16:25:36 -07001246 mod->name);
1247 err = -EINVAL;
1248 goto out;
1249 }
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001250
1251 kobj = kset_find_obj(module_kset, mod->name);
1252 if (kobj) {
1253 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1254 kobject_put(kobj);
1255 err = -EINVAL;
1256 goto out;
1257 }
1258
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 mod->mkobj.mod = mod;
Kay Sieverse17e0f52006-11-24 12:15:25 +01001260
Greg Kroah-Hartmanac3c8142007-12-17 23:05:35 -07001261 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1262 mod->mkobj.kobj.kset = module_kset;
1263 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1264 "%s", mod->name);
1265 if (err)
1266 kobject_put(&mod->mkobj.kobj);
Kay Sievers270a6c42007-01-18 13:26:15 +01001267
Kay Sievers97c146ef2007-11-29 23:46:11 +01001268 /* delay uevent until full sysfs population */
Kay Sievers270a6c42007-01-18 13:26:15 +01001269out:
1270 return err;
1271}
1272
Randy Dunlapef665c12007-02-13 15:19:06 -08001273int mod_sysfs_setup(struct module *mod,
Kay Sievers270a6c42007-01-18 13:26:15 +01001274 struct kernel_param *kparam,
1275 unsigned int num_params)
1276{
1277 int err;
1278
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001279 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
Akinobu Mita240936e2007-04-26 00:12:09 -07001280 if (!mod->holders_dir) {
1281 err = -ENOMEM;
Kay Sievers270a6c42007-01-18 13:26:15 +01001282 goto out_unreg;
Akinobu Mita240936e2007-04-26 00:12:09 -07001283 }
Kay Sievers270a6c42007-01-18 13:26:15 +01001284
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 err = module_param_sysfs_setup(mod, kparam, num_params);
1286 if (err)
Kay Sievers270a6c42007-01-18 13:26:15 +01001287 goto out_unreg_holders;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288
Matt Domschc988d2b2005-06-23 22:05:15 -07001289 err = module_add_modinfo_attrs(mod);
1290 if (err)
Kay Sieverse17e0f52006-11-24 12:15:25 +01001291 goto out_unreg_param;
Matt Domschc988d2b2005-06-23 22:05:15 -07001292
Kay Sieverse17e0f52006-11-24 12:15:25 +01001293 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 return 0;
1295
Kay Sieverse17e0f52006-11-24 12:15:25 +01001296out_unreg_param:
1297 module_param_sysfs_remove(mod);
Kay Sievers270a6c42007-01-18 13:26:15 +01001298out_unreg_holders:
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001299 kobject_put(mod->holders_dir);
Kay Sievers270a6c42007-01-18 13:26:15 +01001300out_unreg:
Kay Sieverse17e0f52006-11-24 12:15:25 +01001301 kobject_put(&mod->mkobj.kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 return err;
1303}
Randy Dunlapef665c12007-02-13 15:19:06 -08001304#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
1306static void mod_kobject_remove(struct module *mod)
1307{
Matt Domschc988d2b2005-06-23 22:05:15 -07001308 module_remove_modinfo_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 module_param_sysfs_remove(mod);
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001310 kobject_put(mod->mkobj.drivers_dir);
1311 kobject_put(mod->holders_dir);
1312 kobject_put(&mod->mkobj.kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313}
1314
1315/*
Rusty Russellbb9d3d52008-01-29 17:13:21 -05001316 * link the module with the whole machine is stopped with interrupts off
1317 * - this defends against kallsyms not taking locks
1318 */
1319static int __link_module(void *_mod)
1320{
1321 struct module *mod = _mod;
1322 list_add(&mod->list, &modules);
1323 return 0;
1324}
1325
1326/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 * unlink the module with the whole machine is stopped with interrupts off
1328 * - this defends against kallsyms not taking locks
1329 */
1330static int __unlink_module(void *_mod)
1331{
1332 struct module *mod = _mod;
1333 list_del(&mod->list);
1334 return 0;
1335}
1336
Robert P. J. Day02a3e592007-05-09 07:26:28 +02001337/* Free a module, remove from lists, etc (must hold module_mutex). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338static void free_module(struct module *mod)
1339{
1340 /* Delete from various lists */
1341 stop_machine_run(__unlink_module, mod, NR_CPUS);
Roland McGrath6d760132007-10-16 23:26:40 -07001342 remove_notes_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 remove_sect_attrs(mod);
1344 mod_kobject_remove(mod);
1345
Jan Beulich4552d5d2006-06-26 13:57:28 +02001346 unwind_remove_table(mod->unwind_info, 0);
1347
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 /* Arch-specific cleanup. */
1349 module_arch_cleanup(mod);
1350
1351 /* Module unload stuff */
1352 module_unload_free(mod);
1353
1354 /* This may be NULL, but that's OK */
1355 module_free(mod, mod->module_init);
1356 kfree(mod->args);
1357 if (mod->percpu)
1358 percpu_modfree(mod->percpu);
1359
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001360 /* Free lock-classes: */
1361 lockdep_free_key_range(mod->module_core, mod->core_size);
1362
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 /* Finally, free the core (containing the module structure) */
1364 module_free(mod, mod->module_core);
1365}
1366
1367void *__symbol_get(const char *symbol)
1368{
1369 struct module *owner;
Rusty Russell24da1cb2007-07-15 23:41:46 -07001370 unsigned long value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 const unsigned long *crc;
1372
Rusty Russell24da1cb2007-07-15 23:41:46 -07001373 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 value = __find_symbol(symbol, &owner, &crc, 1);
Christoph Lameter88173502008-02-08 04:18:41 -08001375 if (IS_ERR_VALUE(value))
1376 value = 0;
1377 else if (strong_try_module_get(owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 value = 0;
Rusty Russell24da1cb2007-07-15 23:41:46 -07001379 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380
1381 return (void *)value;
1382}
1383EXPORT_SYMBOL_GPL(__symbol_get);
1384
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001385/*
1386 * Ensure that an exported symbol [global namespace] does not already exist
Robert P. J. Day02a3e592007-05-09 07:26:28 +02001387 * in the kernel or in some other module's exported symbol table.
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001388 */
1389static int verify_export_symbols(struct module *mod)
1390{
1391 const char *name = NULL;
1392 unsigned long i, ret = 0;
1393 struct module *owner;
1394 const unsigned long *crc;
1395
1396 for (i = 0; i < mod->num_syms; i++)
Christoph Lameter88173502008-02-08 04:18:41 -08001397 if (!IS_ERR_VALUE(__find_symbol(mod->syms[i].name,
1398 &owner, &crc, 1))) {
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001399 name = mod->syms[i].name;
1400 ret = -ENOEXEC;
1401 goto dup;
1402 }
1403
1404 for (i = 0; i < mod->num_gpl_syms; i++)
Christoph Lameter88173502008-02-08 04:18:41 -08001405 if (!IS_ERR_VALUE(__find_symbol(mod->gpl_syms[i].name,
1406 &owner, &crc, 1))) {
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001407 name = mod->gpl_syms[i].name;
1408 ret = -ENOEXEC;
1409 goto dup;
1410 }
1411
1412dup:
1413 if (ret)
1414 printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
1415 mod->name, name, module_name(owner));
1416
1417 return ret;
1418}
1419
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -08001420/* Change all symbols so that st_value encodes the pointer directly. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421static int simplify_symbols(Elf_Shdr *sechdrs,
1422 unsigned int symindex,
1423 const char *strtab,
1424 unsigned int versindex,
1425 unsigned int pcpuindex,
1426 struct module *mod)
1427{
1428 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1429 unsigned long secbase;
1430 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1431 int ret = 0;
1432
1433 for (i = 1; i < n; i++) {
1434 switch (sym[i].st_shndx) {
1435 case SHN_COMMON:
1436 /* We compiled with -fno-common. These are not
1437 supposed to happen. */
1438 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1439 printk("%s: please compile with -fno-common\n",
1440 mod->name);
1441 ret = -ENOEXEC;
1442 break;
1443
1444 case SHN_ABS:
1445 /* Don't need to do anything */
1446 DEBUGP("Absolute symbol: 0x%08lx\n",
1447 (long)sym[i].st_value);
1448 break;
1449
1450 case SHN_UNDEF:
1451 sym[i].st_value
1452 = resolve_symbol(sechdrs, versindex,
1453 strtab + sym[i].st_name, mod);
1454
1455 /* Ok if resolved. */
Christoph Lameter88173502008-02-08 04:18:41 -08001456 if (!IS_ERR_VALUE(sym[i].st_value))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 break;
1458 /* Ok if weak. */
1459 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1460 break;
1461
1462 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1463 mod->name, strtab + sym[i].st_name);
1464 ret = -ENOENT;
1465 break;
1466
1467 default:
1468 /* Divert to percpu allocation if a percpu var. */
1469 if (sym[i].st_shndx == pcpuindex)
1470 secbase = (unsigned long)mod->percpu;
1471 else
1472 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1473 sym[i].st_value += secbase;
1474 break;
1475 }
1476 }
1477
1478 return ret;
1479}
1480
1481/* Update size with this section: return offset. */
1482static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1483{
1484 long ret;
1485
1486 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1487 *size = ret + sechdr->sh_size;
1488 return ret;
1489}
1490
1491/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1492 might -- code, read-only data, read-write data, small data. Tally
1493 sizes, and place the offsets into sh_entsize fields: high bit means it
1494 belongs in init. */
1495static void layout_sections(struct module *mod,
1496 const Elf_Ehdr *hdr,
1497 Elf_Shdr *sechdrs,
1498 const char *secstrings)
1499{
1500 static unsigned long const masks[][2] = {
1501 /* NOTE: all executable code must be the first section
1502 * in this array; otherwise modify the text_size
1503 * finder in the two loops below */
1504 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1505 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1506 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1507 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1508 };
1509 unsigned int m, i;
1510
1511 for (i = 0; i < hdr->e_shnum; i++)
1512 sechdrs[i].sh_entsize = ~0UL;
1513
1514 DEBUGP("Core section allocation order:\n");
1515 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1516 for (i = 0; i < hdr->e_shnum; ++i) {
1517 Elf_Shdr *s = &sechdrs[i];
1518
1519 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1520 || (s->sh_flags & masks[m][1])
1521 || s->sh_entsize != ~0UL
1522 || strncmp(secstrings + s->sh_name,
1523 ".init", 5) == 0)
1524 continue;
1525 s->sh_entsize = get_offset(&mod->core_size, s);
1526 DEBUGP("\t%s\n", secstrings + s->sh_name);
1527 }
1528 if (m == 0)
1529 mod->core_text_size = mod->core_size;
1530 }
1531
1532 DEBUGP("Init section allocation order:\n");
1533 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1534 for (i = 0; i < hdr->e_shnum; ++i) {
1535 Elf_Shdr *s = &sechdrs[i];
1536
1537 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1538 || (s->sh_flags & masks[m][1])
1539 || s->sh_entsize != ~0UL
1540 || strncmp(secstrings + s->sh_name,
1541 ".init", 5) != 0)
1542 continue;
1543 s->sh_entsize = (get_offset(&mod->init_size, s)
1544 | INIT_OFFSET_MASK);
1545 DEBUGP("\t%s\n", secstrings + s->sh_name);
1546 }
1547 if (m == 0)
1548 mod->init_text_size = mod->init_size;
1549 }
1550}
1551
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552static void set_license(struct module *mod, const char *license)
1553{
1554 if (!license)
1555 license = "unspecified";
1556
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001557 if (!license_is_gpl_compatible(license)) {
1558 if (!(tainted & TAINT_PROPRIETARY_MODULE))
Jan Dittmer1d4d2622006-10-28 10:38:38 -07001559 printk(KERN_WARNING "%s: module license '%s' taints "
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001560 "kernel.\n", mod->name, license);
1561 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562 }
1563}
1564
1565/* Parse tag=value strings from .modinfo section */
1566static char *next_string(char *string, unsigned long *secsize)
1567{
1568 /* Skip non-zero chars */
1569 while (string[0]) {
1570 string++;
1571 if ((*secsize)-- <= 1)
1572 return NULL;
1573 }
1574
1575 /* Skip any zero padding. */
1576 while (!string[0]) {
1577 string++;
1578 if ((*secsize)-- <= 1)
1579 return NULL;
1580 }
1581 return string;
1582}
1583
1584static char *get_modinfo(Elf_Shdr *sechdrs,
1585 unsigned int info,
1586 const char *tag)
1587{
1588 char *p;
1589 unsigned int taglen = strlen(tag);
1590 unsigned long size = sechdrs[info].sh_size;
1591
1592 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1593 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1594 return p + taglen + 1;
1595 }
1596 return NULL;
1597}
1598
Matt Domschc988d2b2005-06-23 22:05:15 -07001599static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1600 unsigned int infoindex)
1601{
1602 struct module_attribute *attr;
1603 int i;
1604
1605 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1606 if (attr->setup)
1607 attr->setup(mod,
1608 get_modinfo(sechdrs,
1609 infoindex,
1610 attr->attr.name));
1611 }
1612}
Matt Domschc988d2b2005-06-23 22:05:15 -07001613
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614#ifdef CONFIG_KALLSYMS
Alexey Dobriyanea078902007-05-08 00:28:39 -07001615static int is_exported(const char *name, const struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616{
Sam Ravnborg3fd68052006-02-08 21:16:45 +01001617 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1618 return 1;
1619 else
Jesper Juhlf867d2a2006-06-25 05:47:09 -07001620 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 return 1;
Sam Ravnborg3fd68052006-02-08 21:16:45 +01001622 else
1623 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624}
1625
1626/* As per nm */
1627static char elf_type(const Elf_Sym *sym,
1628 Elf_Shdr *sechdrs,
1629 const char *secstrings,
1630 struct module *mod)
1631{
1632 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1633 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1634 return 'v';
1635 else
1636 return 'w';
1637 }
1638 if (sym->st_shndx == SHN_UNDEF)
1639 return 'U';
1640 if (sym->st_shndx == SHN_ABS)
1641 return 'a';
1642 if (sym->st_shndx >= SHN_LORESERVE)
1643 return '?';
1644 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1645 return 't';
1646 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1647 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1648 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1649 return 'r';
1650 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1651 return 'g';
1652 else
1653 return 'd';
1654 }
1655 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1656 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1657 return 's';
1658 else
1659 return 'b';
1660 }
1661 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1662 ".debug", strlen(".debug")) == 0)
1663 return 'n';
1664 return '?';
1665}
1666
1667static void add_kallsyms(struct module *mod,
1668 Elf_Shdr *sechdrs,
1669 unsigned int symindex,
1670 unsigned int strindex,
1671 const char *secstrings)
1672{
1673 unsigned int i;
1674
1675 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1676 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1677 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1678
1679 /* Set types up while we still have access to sections. */
1680 for (i = 0; i < mod->num_symtab; i++)
1681 mod->symtab[i].st_info
1682 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1683}
1684#else
1685static inline void add_kallsyms(struct module *mod,
1686 Elf_Shdr *sechdrs,
1687 unsigned int symindex,
1688 unsigned int strindex,
1689 const char *secstrings)
1690{
1691}
1692#endif /* CONFIG_KALLSYMS */
1693
1694/* Allocate and load the module: note that size of section 0 is always
1695 zero, and we rely on this for optional sections. */
1696static struct module *load_module(void __user *umod,
1697 unsigned long len,
1698 const char __user *uargs)
1699{
1700 Elf_Ehdr *hdr;
1701 Elf_Shdr *sechdrs;
1702 char *secstrings, *args, *modmagic, *strtab = NULL;
Andrew Morton84860f92006-06-28 04:26:46 -07001703 unsigned int i;
1704 unsigned int symindex = 0;
1705 unsigned int strindex = 0;
1706 unsigned int setupindex;
1707 unsigned int exindex;
1708 unsigned int exportindex;
1709 unsigned int modindex;
1710 unsigned int obsparmindex;
1711 unsigned int infoindex;
1712 unsigned int gplindex;
1713 unsigned int crcindex;
1714 unsigned int gplcrcindex;
1715 unsigned int versindex;
1716 unsigned int pcpuindex;
1717 unsigned int gplfutureindex;
1718 unsigned int gplfuturecrcindex;
1719 unsigned int unwindex = 0;
1720 unsigned int unusedindex;
1721 unsigned int unusedcrcindex;
1722 unsigned int unusedgplindex;
1723 unsigned int unusedgplcrcindex;
Mathieu Desnoyers8256e472007-10-18 23:41:06 -07001724 unsigned int markersindex;
1725 unsigned int markersstringsindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 struct module *mod;
1727 long err = 0;
1728 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1729 struct exception_table_entry *extable;
Thomas Koeller378bac82005-09-06 15:17:11 -07001730 mm_segment_t old_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731
1732 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1733 umod, len, uargs);
1734 if (len < sizeof(*hdr))
1735 return ERR_PTR(-ENOEXEC);
1736
1737 /* Suck in entire file: we'll want most of it. */
1738 /* vmalloc barfs on "unusual" numbers. Check here */
1739 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1740 return ERR_PTR(-ENOMEM);
1741 if (copy_from_user(hdr, umod, len) != 0) {
1742 err = -EFAULT;
1743 goto free_hdr;
1744 }
1745
1746 /* Sanity checks against insmoding binaries or wrong arch,
1747 weird elf version */
1748 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1749 || hdr->e_type != ET_REL
1750 || !elf_check_arch(hdr)
1751 || hdr->e_shentsize != sizeof(*sechdrs)) {
1752 err = -ENOEXEC;
1753 goto free_hdr;
1754 }
1755
1756 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1757 goto truncated;
1758
1759 /* Convenience variables */
1760 sechdrs = (void *)hdr + hdr->e_shoff;
1761 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1762 sechdrs[0].sh_addr = 0;
1763
1764 for (i = 1; i < hdr->e_shnum; i++) {
1765 if (sechdrs[i].sh_type != SHT_NOBITS
1766 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1767 goto truncated;
1768
1769 /* Mark all sections sh_addr with their address in the
1770 temporary image. */
1771 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1772
1773 /* Internal symbols and strings. */
1774 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1775 symindex = i;
1776 strindex = sechdrs[i].sh_link;
1777 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1778 }
1779#ifndef CONFIG_MODULE_UNLOAD
1780 /* Don't load .exit sections */
1781 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1782 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1783#endif
1784 }
1785
1786 modindex = find_sec(hdr, sechdrs, secstrings,
1787 ".gnu.linkonce.this_module");
1788 if (!modindex) {
1789 printk(KERN_WARNING "No module found in object\n");
1790 err = -ENOEXEC;
1791 goto free_hdr;
1792 }
1793 mod = (void *)sechdrs[modindex].sh_addr;
1794
1795 if (symindex == 0) {
1796 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1797 mod->name);
1798 err = -ENOEXEC;
1799 goto free_hdr;
1800 }
1801
1802 /* Optional sections */
1803 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1804 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001805 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001806 unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
1807 unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1809 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001810 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001811 unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
1812 unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1814 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1815 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1816 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1817 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1818 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
Jan Beulich4552d5d2006-06-26 13:57:28 +02001819#ifdef ARCH_UNWIND_SECTION_NAME
1820 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1821#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822
1823 /* Don't keep modinfo section */
1824 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1825#ifdef CONFIG_KALLSYMS
1826 /* Keep symbol and string tables for decoding later. */
1827 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1828 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1829#endif
Jan Beulich4552d5d2006-06-26 13:57:28 +02001830 if (unwindex)
1831 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832
1833 /* Check module struct version now, before we try to use module. */
1834 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1835 err = -ENOEXEC;
1836 goto free_hdr;
1837 }
1838
1839 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1840 /* This is allowed: modprobe --force will invalidate it. */
1841 if (!modmagic) {
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001842 add_taint_module(mod, TAINT_FORCED_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1844 mod->name);
1845 } else if (!same_magic(modmagic, vermagic)) {
1846 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1847 mod->name, modmagic, vermagic);
1848 err = -ENOEXEC;
1849 goto free_hdr;
1850 }
1851
1852 /* Now copy in args */
Davi Arnaut24277dd2006-03-24 03:18:43 -08001853 args = strndup_user(uargs, ~0UL >> 1);
1854 if (IS_ERR(args)) {
1855 err = PTR_ERR(args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 goto free_hdr;
1857 }
Andrew Morton8e08b752006-02-07 12:58:45 -08001858
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859 if (find_module(mod->name)) {
1860 err = -EEXIST;
1861 goto free_mod;
1862 }
1863
1864 mod->state = MODULE_STATE_COMING;
1865
1866 /* Allow arches to frob section contents and sizes. */
1867 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1868 if (err < 0)
1869 goto free_mod;
1870
1871 if (pcpuindex) {
1872 /* We have a special allocation for this section. */
1873 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
Rusty Russell842bbaa2005-08-01 21:11:47 -07001874 sechdrs[pcpuindex].sh_addralign,
1875 mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 if (!percpu) {
1877 err = -ENOMEM;
1878 goto free_mod;
1879 }
1880 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1881 mod->percpu = percpu;
1882 }
1883
1884 /* Determine total sizes, and put offsets in sh_entsize. For now
1885 this is done generically; there doesn't appear to be any
1886 special cases for the architectures. */
1887 layout_sections(mod, hdr, sechdrs, secstrings);
1888
1889 /* Do the allocs. */
1890 ptr = module_alloc(mod->core_size);
1891 if (!ptr) {
1892 err = -ENOMEM;
1893 goto free_percpu;
1894 }
1895 memset(ptr, 0, mod->core_size);
1896 mod->module_core = ptr;
1897
1898 ptr = module_alloc(mod->init_size);
1899 if (!ptr && mod->init_size) {
1900 err = -ENOMEM;
1901 goto free_core;
1902 }
1903 memset(ptr, 0, mod->init_size);
1904 mod->module_init = ptr;
1905
1906 /* Transfer each section which specifies SHF_ALLOC */
1907 DEBUGP("final section addresses:\n");
1908 for (i = 0; i < hdr->e_shnum; i++) {
1909 void *dest;
1910
1911 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1912 continue;
1913
1914 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1915 dest = mod->module_init
1916 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1917 else
1918 dest = mod->module_core + sechdrs[i].sh_entsize;
1919
1920 if (sechdrs[i].sh_type != SHT_NOBITS)
1921 memcpy(dest, (void *)sechdrs[i].sh_addr,
1922 sechdrs[i].sh_size);
1923 /* Update sh_addr to point to copy in image. */
1924 sechdrs[i].sh_addr = (unsigned long)dest;
1925 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1926 }
1927 /* Module has been moved. */
1928 mod = (void *)sechdrs[modindex].sh_addr;
1929
1930 /* Now we've moved module, initialize linked lists, etc. */
1931 module_unload_init(mod);
1932
Kay Sievers97c146ef2007-11-29 23:46:11 +01001933 /* add kobject, so we can reference it. */
Akinobu Mitad58ae672007-10-16 23:30:27 -07001934 err = mod_sysfs_init(mod);
1935 if (err)
Kay Sievers97c146ef2007-11-29 23:46:11 +01001936 goto free_unload;
Kay Sievers270a6c42007-01-18 13:26:15 +01001937
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 /* Set up license info based on the info section */
1939 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1940
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001941 if (strcmp(mod->name, "ndiswrapper") == 0)
Jon Masters0aa5bd52008-01-21 20:43:41 +00001942 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001943 if (strcmp(mod->name, "driverloader") == 0)
1944 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Dave Jones9841d612006-01-08 01:03:41 -08001945
Matt Domschc988d2b2005-06-23 22:05:15 -07001946 /* Set up MODINFO_ATTR fields */
1947 setup_modinfo(mod, sechdrs, infoindex);
Matt Domschc988d2b2005-06-23 22:05:15 -07001948
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 /* Fix up syms, so that st_value is a pointer to location. */
1950 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1951 mod);
1952 if (err < 0)
1953 goto cleanup;
1954
1955 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1956 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1957 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1958 if (crcindex)
1959 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1960 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1961 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1962 if (gplcrcindex)
1963 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001964 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
1965 sizeof(*mod->gpl_future_syms);
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001966 mod->num_unused_syms = sechdrs[unusedindex].sh_size /
1967 sizeof(*mod->unused_syms);
1968 mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
1969 sizeof(*mod->unused_gpl_syms);
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001970 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
1971 if (gplfuturecrcindex)
1972 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001974 mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
1975 if (unusedcrcindex)
1976 mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
1977 mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
1978 if (unusedgplcrcindex)
1979 mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr;
1980
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981#ifdef CONFIG_MODVERSIONS
Daniel Walker22a8bde2007-10-18 03:06:07 -07001982 if ((mod->num_syms && !crcindex) ||
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -08001983 (mod->num_gpl_syms && !gplcrcindex) ||
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001984 (mod->num_gpl_future_syms && !gplfuturecrcindex) ||
1985 (mod->num_unused_syms && !unusedcrcindex) ||
1986 (mod->num_unused_gpl_syms && !unusedgplcrcindex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 printk(KERN_WARNING "%s: No versions for exported symbols."
1988 " Tainting kernel.\n", mod->name);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001989 add_taint_module(mod, TAINT_FORCED_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 }
1991#endif
Mathieu Desnoyers8256e472007-10-18 23:41:06 -07001992 markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
1993 markersstringsindex = find_sec(hdr, sechdrs, secstrings,
1994 "__markers_strings");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995
1996 /* Now do relocations. */
1997 for (i = 1; i < hdr->e_shnum; i++) {
1998 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1999 unsigned int info = sechdrs[i].sh_info;
2000
2001 /* Not a valid relocation section? */
2002 if (info >= hdr->e_shnum)
2003 continue;
2004
2005 /* Don't bother with non-allocated sections */
2006 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2007 continue;
2008
2009 if (sechdrs[i].sh_type == SHT_REL)
2010 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2011 else if (sechdrs[i].sh_type == SHT_RELA)
2012 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2013 mod);
2014 if (err < 0)
2015 goto cleanup;
2016 }
Mathieu Desnoyers8256e472007-10-18 23:41:06 -07002017#ifdef CONFIG_MARKERS
2018 mod->markers = (void *)sechdrs[markersindex].sh_addr;
2019 mod->num_markers =
2020 sechdrs[markersindex].sh_size / sizeof(*mod->markers);
2021#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022
Ashutosh Naikeea8b542006-01-08 01:04:25 -08002023 /* Find duplicate symbols */
2024 err = verify_export_symbols(mod);
2025
2026 if (err < 0)
2027 goto cleanup;
2028
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029 /* Set up and sort exception table */
2030 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
2031 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
2032 sort_extable(extable, extable + mod->num_exentries);
2033
2034 /* Finally, copy percpu area over. */
2035 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2036 sechdrs[pcpuindex].sh_size);
2037
2038 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
2039
Mathieu Desnoyers8256e472007-10-18 23:41:06 -07002040#ifdef CONFIG_MARKERS
2041 if (!mod->taints)
2042 marker_update_probe_range(mod->markers,
2043 mod->markers + mod->num_markers, NULL, NULL);
2044#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045 err = module_finalize(hdr, sechdrs, mod);
2046 if (err < 0)
2047 goto cleanup;
2048
Thomas Koeller378bac82005-09-06 15:17:11 -07002049 /* flush the icache in correct context */
2050 old_fs = get_fs();
2051 set_fs(KERNEL_DS);
2052
2053 /*
2054 * Flush the instruction cache, since we've played with text.
2055 * Do it before processing of module parameters, so the module
2056 * can provide parameter accessor functions of its own.
2057 */
2058 if (mod->module_init)
2059 flush_icache_range((unsigned long)mod->module_init,
2060 (unsigned long)mod->module_init
2061 + mod->init_size);
2062 flush_icache_range((unsigned long)mod->module_core,
2063 (unsigned long)mod->module_core + mod->core_size);
2064
2065 set_fs(old_fs);
2066
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 mod->args = args;
Rusty Russell8d3b33f2006-03-25 03:07:05 -08002068 if (obsparmindex)
2069 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2070 mod->name);
2071
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002072 /* Now sew it into the lists so we can get lockdep and oops
2073 * info during argument parsing. Noone should access us, since
2074 * strong_try_module_get() will fail. */
2075 stop_machine_run(__link_module, mod, NR_CPUS);
2076
Rusty Russell8d3b33f2006-03-25 03:07:05 -08002077 /* Size of section 0 is 0, so this works well if no params */
2078 err = parse_args(mod->name, mod->args,
2079 (struct kernel_param *)
2080 sechdrs[setupindex].sh_addr,
2081 sechdrs[setupindex].sh_size
2082 / sizeof(struct kernel_param),
2083 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002085 goto unlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002086
Daniel Walker22a8bde2007-10-18 03:06:07 -07002087 err = mod_sysfs_setup(mod,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088 (struct kernel_param *)
2089 sechdrs[setupindex].sh_addr,
2090 sechdrs[setupindex].sh_size
2091 / sizeof(struct kernel_param));
2092 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002093 goto unlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
Roland McGrath6d760132007-10-16 23:26:40 -07002095 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096
Jan Beulich4552d5d2006-06-26 13:57:28 +02002097 /* Size of section 0 is 0, so this works well if no unwind info. */
2098 mod->unwind_info = unwind_add_table(mod,
Daniel Walker22a8bde2007-10-18 03:06:07 -07002099 (void *)sechdrs[unwindex].sh_addr,
2100 sechdrs[unwindex].sh_size);
Jan Beulich4552d5d2006-06-26 13:57:28 +02002101
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 /* Get rid of temporary copy */
2103 vfree(hdr);
2104
2105 /* Done! */
2106 return mod;
2107
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002108 unlink:
2109 stop_machine_run(__unlink_module, mod, NR_CPUS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 module_arch_cleanup(mod);
2111 cleanup:
Kay Sievers97c146ef2007-11-29 23:46:11 +01002112 kobject_del(&mod->mkobj.kobj);
2113 kobject_put(&mod->mkobj.kobj);
2114 free_unload:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 module_unload_free(mod);
2116 module_free(mod, mod->module_init);
2117 free_core:
2118 module_free(mod, mod->module_core);
2119 free_percpu:
2120 if (percpu)
2121 percpu_modfree(percpu);
2122 free_mod:
2123 kfree(args);
2124 free_hdr:
2125 vfree(hdr);
Jayachandran C6fe2e702006-01-06 00:19:54 -08002126 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127
2128 truncated:
2129 printk(KERN_ERR "Module len %lu truncated\n", len);
2130 err = -ENOEXEC;
2131 goto free_hdr;
2132}
2133
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134/* This is where the real work happens */
2135asmlinkage long
2136sys_init_module(void __user *umod,
2137 unsigned long len,
2138 const char __user *uargs)
2139{
2140 struct module *mod;
2141 int ret = 0;
2142
2143 /* Must have permission */
2144 if (!capable(CAP_SYS_MODULE))
2145 return -EPERM;
2146
2147 /* Only one module load at a time, please */
Ashutosh Naik6389a382006-03-23 03:00:46 -08002148 if (mutex_lock_interruptible(&module_mutex) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 return -EINTR;
2150
2151 /* Do all the hard work */
2152 mod = load_module(umod, len, uargs);
2153 if (IS_ERR(mod)) {
Ashutosh Naik6389a382006-03-23 03:00:46 -08002154 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155 return PTR_ERR(mod);
2156 }
2157
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158 /* Drop lock so they can recurse */
Ashutosh Naik6389a382006-03-23 03:00:46 -08002159 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160
Alan Sterne041c682006-03-27 01:16:30 -08002161 blocking_notifier_call_chain(&module_notify_list,
2162 MODULE_STATE_COMING, mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002163
2164 /* Start the module */
2165 if (mod->init != NULL)
2166 ret = mod->init();
2167 if (ret < 0) {
2168 /* Init routine failed: abort. Try to protect us from
2169 buggy refcounters. */
2170 mod->state = MODULE_STATE_GOING;
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07002171 synchronize_sched();
Rusty Russellaf49d922007-10-16 23:26:27 -07002172 module_put(mod);
2173 mutex_lock(&module_mutex);
2174 free_module(mod);
2175 mutex_unlock(&module_mutex);
Rusty Russellc9a3ba52008-01-29 17:13:18 -05002176 wake_up(&module_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177 return ret;
2178 }
2179
2180 /* Now it's a first class citizen! */
Ashutosh Naik6389a382006-03-23 03:00:46 -08002181 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182 mod->state = MODULE_STATE_LIVE;
2183 /* Drop initial reference. */
2184 module_put(mod);
Jan Beulich4552d5d2006-06-26 13:57:28 +02002185 unwind_remove_table(mod->unwind_info, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186 module_free(mod, mod->module_init);
2187 mod->module_init = NULL;
2188 mod->init_size = 0;
2189 mod->init_text_size = 0;
Ashutosh Naik6389a382006-03-23 03:00:46 -08002190 mutex_unlock(&module_mutex);
Rusty Russellc9a3ba52008-01-29 17:13:18 -05002191 wake_up(&module_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192
2193 return 0;
2194}
2195
2196static inline int within(unsigned long addr, void *start, unsigned long size)
2197{
2198 return ((void *)addr >= start && (void *)addr < start + size);
2199}
2200
2201#ifdef CONFIG_KALLSYMS
2202/*
2203 * This ignores the intensely annoying "mapping symbols" found
2204 * in ARM ELF files: $a, $t and $d.
2205 */
2206static inline int is_arm_mapping_symbol(const char *str)
2207{
Daniel Walker22a8bde2007-10-18 03:06:07 -07002208 return str[0] == '$' && strchr("atd", str[1])
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 && (str[2] == '\0' || str[2] == '.');
2210}
2211
2212static const char *get_ksymbol(struct module *mod,
2213 unsigned long addr,
2214 unsigned long *size,
2215 unsigned long *offset)
2216{
2217 unsigned int i, best = 0;
2218 unsigned long nextval;
2219
2220 /* At worse, next value is at end of module */
2221 if (within(addr, mod->module_init, mod->init_size))
2222 nextval = (unsigned long)mod->module_init+mod->init_text_size;
Daniel Walker22a8bde2007-10-18 03:06:07 -07002223 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2225
2226 /* Scan for closest preceeding symbol, and next symbol. (ELF
Daniel Walker22a8bde2007-10-18 03:06:07 -07002227 starts real symbols at 1). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228 for (i = 1; i < mod->num_symtab; i++) {
2229 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2230 continue;
2231
2232 /* We ignore unnamed symbols: they're uninformative
2233 * and inserted at a whim. */
2234 if (mod->symtab[i].st_value <= addr
2235 && mod->symtab[i].st_value > mod->symtab[best].st_value
2236 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2237 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2238 best = i;
2239 if (mod->symtab[i].st_value > addr
2240 && mod->symtab[i].st_value < nextval
2241 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2242 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2243 nextval = mod->symtab[i].st_value;
2244 }
2245
2246 if (!best)
2247 return NULL;
2248
Alexey Dobriyanffb45122007-05-08 00:28:41 -07002249 if (size)
2250 *size = nextval - mod->symtab[best].st_value;
2251 if (offset)
2252 *offset = addr - mod->symtab[best].st_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253 return mod->strtab + mod->symtab[best].st_name;
2254}
2255
Rusty Russell6dd06c92008-01-29 17:13:22 -05002256/* For kallsyms to ask for address resolution. NULL means not found. Careful
2257 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2258char *module_address_lookup(unsigned long addr,
2259 unsigned long *size,
2260 unsigned long *offset,
2261 char **modname,
2262 char *namebuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263{
2264 struct module *mod;
Rusty Russellcb2a5202008-01-14 00:55:03 -08002265 const char *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266
Rusty Russellcb2a5202008-01-14 00:55:03 -08002267 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268 list_for_each_entry(mod, &modules, list) {
2269 if (within(addr, mod->module_init, mod->init_size)
2270 || within(addr, mod->module_core, mod->core_size)) {
Franck Bui-Huuffc50892006-10-03 01:13:48 -07002271 if (modname)
2272 *modname = mod->name;
Rusty Russellcb2a5202008-01-14 00:55:03 -08002273 ret = get_ksymbol(mod, addr, size, offset);
2274 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275 }
2276 }
Rusty Russell6dd06c92008-01-29 17:13:22 -05002277 /* Make a copy in here where it's safe */
2278 if (ret) {
2279 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2280 ret = namebuf;
2281 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08002282 preempt_enable();
Rusty Russell6dd06c92008-01-29 17:13:22 -05002283 return (char *)ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002284}
2285
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002286int lookup_module_symbol_name(unsigned long addr, char *symname)
2287{
2288 struct module *mod;
2289
Rusty Russellcb2a5202008-01-14 00:55:03 -08002290 preempt_disable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002291 list_for_each_entry(mod, &modules, list) {
2292 if (within(addr, mod->module_init, mod->init_size) ||
2293 within(addr, mod->module_core, mod->core_size)) {
2294 const char *sym;
2295
2296 sym = get_ksymbol(mod, addr, NULL, NULL);
2297 if (!sym)
2298 goto out;
Tejun Heo9281ace2007-07-17 04:03:51 -07002299 strlcpy(symname, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08002300 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002301 return 0;
2302 }
2303 }
2304out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08002305 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002306 return -ERANGE;
2307}
2308
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002309int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2310 unsigned long *offset, char *modname, char *name)
2311{
2312 struct module *mod;
2313
Rusty Russellcb2a5202008-01-14 00:55:03 -08002314 preempt_disable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002315 list_for_each_entry(mod, &modules, list) {
2316 if (within(addr, mod->module_init, mod->init_size) ||
2317 within(addr, mod->module_core, mod->core_size)) {
2318 const char *sym;
2319
2320 sym = get_ksymbol(mod, addr, size, offset);
2321 if (!sym)
2322 goto out;
2323 if (modname)
Tejun Heo9281ace2007-07-17 04:03:51 -07002324 strlcpy(modname, mod->name, MODULE_NAME_LEN);
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002325 if (name)
Tejun Heo9281ace2007-07-17 04:03:51 -07002326 strlcpy(name, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08002327 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002328 return 0;
2329 }
2330 }
2331out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08002332 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002333 return -ERANGE;
2334}
2335
Alexey Dobriyanea078902007-05-08 00:28:39 -07002336int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2337 char *name, char *module_name, int *exported)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338{
2339 struct module *mod;
2340
Rusty Russellcb2a5202008-01-14 00:55:03 -08002341 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 list_for_each_entry(mod, &modules, list) {
2343 if (symnum < mod->num_symtab) {
2344 *value = mod->symtab[symnum].st_value;
2345 *type = mod->symtab[symnum].st_info;
Andreas Gruenbacher098c5ee2006-07-14 00:24:04 -07002346 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
Tejun Heo9281ace2007-07-17 04:03:51 -07002347 KSYM_NAME_LEN);
2348 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
Alexey Dobriyanea078902007-05-08 00:28:39 -07002349 *exported = is_exported(name, mod);
Rusty Russellcb2a5202008-01-14 00:55:03 -08002350 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07002351 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 }
2353 symnum -= mod->num_symtab;
2354 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08002355 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07002356 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357}
2358
2359static unsigned long mod_find_symname(struct module *mod, const char *name)
2360{
2361 unsigned int i;
2362
2363 for (i = 0; i < mod->num_symtab; i++)
Keith Owens54e8ce42006-02-03 03:03:53 -08002364 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2365 mod->symtab[i].st_info != 'U')
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366 return mod->symtab[i].st_value;
2367 return 0;
2368}
2369
2370/* Look for this name: can be of form module:name. */
2371unsigned long module_kallsyms_lookup_name(const char *name)
2372{
2373 struct module *mod;
2374 char *colon;
2375 unsigned long ret = 0;
2376
2377 /* Don't lock: we're in enough trouble already. */
Rusty Russellcb2a5202008-01-14 00:55:03 -08002378 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002379 if ((colon = strchr(name, ':')) != NULL) {
2380 *colon = '\0';
2381 if ((mod = find_module(name)) != NULL)
2382 ret = mod_find_symname(mod, colon+1);
2383 *colon = ':';
2384 } else {
2385 list_for_each_entry(mod, &modules, list)
2386 if ((ret = mod_find_symname(mod, name)) != 0)
2387 break;
2388 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08002389 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390 return ret;
2391}
2392#endif /* CONFIG_KALLSYMS */
2393
2394/* Called by the /proc file system to return a list of modules. */
2395static void *m_start(struct seq_file *m, loff_t *pos)
2396{
Ashutosh Naik6389a382006-03-23 03:00:46 -08002397 mutex_lock(&module_mutex);
Pavel Emelianov708f4b52007-07-15 23:39:54 -07002398 return seq_list_start(&modules, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002399}
2400
2401static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2402{
Pavel Emelianov708f4b52007-07-15 23:39:54 -07002403 return seq_list_next(p, &modules, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404}
2405
2406static void m_stop(struct seq_file *m, void *p)
2407{
Ashutosh Naik6389a382006-03-23 03:00:46 -08002408 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409}
2410
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002411static char *module_flags(struct module *mod, char *buf)
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002412{
2413 int bx = 0;
2414
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002415 if (mod->taints ||
2416 mod->state == MODULE_STATE_GOING ||
2417 mod->state == MODULE_STATE_COMING) {
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002418 buf[bx++] = '(';
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002419 if (mod->taints & TAINT_PROPRIETARY_MODULE)
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002420 buf[bx++] = 'P';
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002421 if (mod->taints & TAINT_FORCED_MODULE)
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002422 buf[bx++] = 'F';
2423 /*
2424 * TAINT_FORCED_RMMOD: could be added.
2425 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2426 * apply to modules.
2427 */
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002428
2429 /* Show a - for module-is-being-unloaded */
2430 if (mod->state == MODULE_STATE_GOING)
2431 buf[bx++] = '-';
2432 /* Show a + for module-is-being-loaded */
2433 if (mod->state == MODULE_STATE_COMING)
2434 buf[bx++] = '+';
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002435 buf[bx++] = ')';
2436 }
2437 buf[bx] = '\0';
2438
2439 return buf;
2440}
2441
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442static int m_show(struct seq_file *m, void *p)
2443{
2444 struct module *mod = list_entry(p, struct module, list);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002445 char buf[8];
2446
Linus Torvalds1da177e2005-04-16 15:20:36 -07002447 seq_printf(m, "%s %lu",
2448 mod->name, mod->init_size + mod->core_size);
2449 print_unload_info(m, mod);
2450
2451 /* Informative for users. */
2452 seq_printf(m, " %s",
2453 mod->state == MODULE_STATE_GOING ? "Unloading":
2454 mod->state == MODULE_STATE_COMING ? "Loading":
2455 "Live");
2456 /* Used by oprofile and other similar tools. */
2457 seq_printf(m, " 0x%p", mod->module_core);
2458
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002459 /* Taints info */
2460 if (mod->taints)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002461 seq_printf(m, " %s", module_flags(mod, buf));
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002462
Linus Torvalds1da177e2005-04-16 15:20:36 -07002463 seq_printf(m, "\n");
2464 return 0;
2465}
2466
2467/* Format: modulename size refcount deps address
2468
2469 Where refcount is a number or -, and deps is a comma-separated list
2470 of depends or -.
2471*/
Helge Deller15ad7cd2006-12-06 20:40:36 -08002472const struct seq_operations modules_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473 .start = m_start,
2474 .next = m_next,
2475 .stop = m_stop,
2476 .show = m_show
2477};
2478
2479/* Given an address, look for it in the module exception tables. */
2480const struct exception_table_entry *search_module_extables(unsigned long addr)
2481{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482 const struct exception_table_entry *e = NULL;
2483 struct module *mod;
2484
Rusty Russell24da1cb2007-07-15 23:41:46 -07002485 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002486 list_for_each_entry(mod, &modules, list) {
2487 if (mod->num_exentries == 0)
2488 continue;
Daniel Walker22a8bde2007-10-18 03:06:07 -07002489
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490 e = search_extable(mod->extable,
2491 mod->extable + mod->num_exentries - 1,
2492 addr);
2493 if (e)
2494 break;
2495 }
Rusty Russell24da1cb2007-07-15 23:41:46 -07002496 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002497
2498 /* Now, if we found one, we are running inside it now, hence
Daniel Walker22a8bde2007-10-18 03:06:07 -07002499 we cannot unload the module, hence no refcnt needed. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500 return e;
2501}
2502
Ingo Molnar4d435f92006-07-03 00:24:24 -07002503/*
2504 * Is this a valid module address?
2505 */
2506int is_module_address(unsigned long addr)
2507{
Ingo Molnar4d435f92006-07-03 00:24:24 -07002508 struct module *mod;
2509
Rusty Russell24da1cb2007-07-15 23:41:46 -07002510 preempt_disable();
Ingo Molnar4d435f92006-07-03 00:24:24 -07002511
2512 list_for_each_entry(mod, &modules, list) {
2513 if (within(addr, mod->module_core, mod->core_size)) {
Rusty Russell24da1cb2007-07-15 23:41:46 -07002514 preempt_enable();
Ingo Molnar4d435f92006-07-03 00:24:24 -07002515 return 1;
2516 }
2517 }
2518
Rusty Russell24da1cb2007-07-15 23:41:46 -07002519 preempt_enable();
Ingo Molnar4d435f92006-07-03 00:24:24 -07002520
2521 return 0;
2522}
2523
2524
Rusty Russell24da1cb2007-07-15 23:41:46 -07002525/* Is this a valid kernel address? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526struct module *__module_text_address(unsigned long addr)
2527{
2528 struct module *mod;
2529
2530 list_for_each_entry(mod, &modules, list)
2531 if (within(addr, mod->module_init, mod->init_text_size)
2532 || within(addr, mod->module_core, mod->core_text_size))
2533 return mod;
2534 return NULL;
2535}
2536
2537struct module *module_text_address(unsigned long addr)
2538{
2539 struct module *mod;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540
Rusty Russell24da1cb2007-07-15 23:41:46 -07002541 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002542 mod = __module_text_address(addr);
Rusty Russell24da1cb2007-07-15 23:41:46 -07002543 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002544
2545 return mod;
2546}
2547
2548/* Don't grab lock, we're oopsing. */
2549void print_modules(void)
2550{
2551 struct module *mod;
Randy Dunlap2bc2d612006-10-02 02:17:02 -07002552 char buf[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002553
2554 printk("Modules linked in:");
2555 list_for_each_entry(mod, &modules, list)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002556 printk(" %s%s", mod->name, module_flags(mod, buf));
Arjan van de Vene14af7e2008-01-25 21:08:33 +01002557 if (last_unloaded_module[0])
2558 printk(" [last unloaded: %s]", last_unloaded_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002559 printk("\n");
2560}
2561
Linus Torvalds1da177e2005-04-16 15:20:36 -07002562#ifdef CONFIG_MODVERSIONS
2563/* Generate the signature for struct module here, too, for modversions. */
2564void struct_module(struct module *mod) { return; }
2565EXPORT_SYMBOL(struct_module);
2566#endif
Mathieu Desnoyers8256e472007-10-18 23:41:06 -07002567
2568#ifdef CONFIG_MARKERS
2569void module_update_markers(struct module *probe_module, int *refcount)
2570{
2571 struct module *mod;
2572
2573 mutex_lock(&module_mutex);
2574 list_for_each_entry(mod, &modules, list)
2575 if (!mod->taints)
2576 marker_update_probe_range(mod->markers,
2577 mod->markers + mod->num_markers,
2578 probe_module, refcount);
2579 mutex_unlock(&module_mutex);
2580}
2581#endif