ia64/linux-2.6.18-xen.hg

view kernel/module.c @ 562:66faefe721eb

pvSCSI backend driver

Signed-off-by: Tomonari Horikoshi <t.horikoshi@jp.fujitsu.com>
Signed-off-by: Jun Kamada <kama@jp.fujitsu.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Jun 02 09:58:27 2008 +0100 (2008-06-02)
parents 3e8752eb6d9c
children
line source
1 /*
2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
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.
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.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19 #include <linux/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/slab.h>
24 #include <linux/vmalloc.h>
25 #include <linux/elf.h>
26 #include <linux/seq_file.h>
27 #include <linux/syscalls.h>
28 #include <linux/fcntl.h>
29 #include <linux/rcupdate.h>
30 #include <linux/capability.h>
31 #include <linux/cpu.h>
32 #include <linux/moduleparam.h>
33 #include <linux/errno.h>
34 #include <linux/err.h>
35 #include <linux/vermagic.h>
36 #include <linux/notifier.h>
37 #include <linux/stop_machine.h>
38 #include <linux/device.h>
39 #include <linux/string.h>
40 #include <linux/sched.h>
41 #include <linux/mutex.h>
42 #include <linux/unwind.h>
43 #include <asm/uaccess.h>
44 #include <asm/semaphore.h>
45 #include <asm/cacheflush.h>
46 #include <linux/license.h>
48 #if 0
49 #define DEBUGP printk
50 #else
51 #define DEBUGP(fmt , a...)
52 #endif
54 #ifndef ARCH_SHF_SMALL
55 #define ARCH_SHF_SMALL 0
56 #endif
58 /* If this is set, the section belongs in the init part of the module */
59 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
61 /* Protects module list */
62 static DEFINE_SPINLOCK(modlist_lock);
64 /* List of modules, protected by module_mutex AND modlist_lock */
65 static DEFINE_MUTEX(module_mutex);
66 static LIST_HEAD(modules);
68 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
70 int register_module_notifier(struct notifier_block * nb)
71 {
72 return blocking_notifier_chain_register(&module_notify_list, nb);
73 }
74 EXPORT_SYMBOL(register_module_notifier);
76 int unregister_module_notifier(struct notifier_block * nb)
77 {
78 return blocking_notifier_chain_unregister(&module_notify_list, nb);
79 }
80 EXPORT_SYMBOL(unregister_module_notifier);
82 /* We require a truly strong try_module_get() */
83 static inline int strong_try_module_get(struct module *mod)
84 {
85 if (mod && mod->state == MODULE_STATE_COMING)
86 return 0;
87 return try_module_get(mod);
88 }
90 /* A thread that wants to hold a reference to a module only while it
91 * is running can call ths to safely exit.
92 * nfsd and lockd use this.
93 */
94 void __module_put_and_exit(struct module *mod, long code)
95 {
96 module_put(mod);
97 do_exit(code);
98 }
99 EXPORT_SYMBOL(__module_put_and_exit);
101 /* Find a module section: 0 means not found. */
102 static unsigned int find_sec(Elf_Ehdr *hdr,
103 Elf_Shdr *sechdrs,
104 const char *secstrings,
105 const char *name)
106 {
107 unsigned int i;
109 for (i = 1; i < hdr->e_shnum; i++)
110 /* Alloc bit cleared means "ignore it." */
111 if ((sechdrs[i].sh_flags & SHF_ALLOC)
112 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
113 return i;
114 return 0;
115 }
117 /* Provided by the linker */
118 extern const struct kernel_symbol __start___ksymtab[];
119 extern const struct kernel_symbol __stop___ksymtab[];
120 extern const struct kernel_symbol __start___ksymtab_gpl[];
121 extern const struct kernel_symbol __stop___ksymtab_gpl[];
122 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
123 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
124 extern const struct kernel_symbol __start___ksymtab_unused[];
125 extern const struct kernel_symbol __stop___ksymtab_unused[];
126 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
127 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
128 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
129 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
130 extern const unsigned long __start___kcrctab[];
131 extern const unsigned long __start___kcrctab_gpl[];
132 extern const unsigned long __start___kcrctab_gpl_future[];
133 extern const unsigned long __start___kcrctab_unused[];
134 extern const unsigned long __start___kcrctab_unused_gpl[];
136 #ifndef CONFIG_MODVERSIONS
137 #define symversion(base, idx) NULL
138 #else
139 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
140 #endif
142 /* lookup symbol in given range of kernel_symbols */
143 static const struct kernel_symbol *lookup_symbol(const char *name,
144 const struct kernel_symbol *start,
145 const struct kernel_symbol *stop)
146 {
147 const struct kernel_symbol *ks = start;
148 for (; ks < stop; ks++)
149 if (strcmp(ks->name, name) == 0)
150 return ks;
151 return NULL;
152 }
154 static void printk_unused_warning(const char *name)
155 {
156 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
157 "however this module is using it.\n", name);
158 printk(KERN_WARNING "This symbol will go away in the future.\n");
159 printk(KERN_WARNING "Please evalute if this is the right api to use, "
160 "and if it really is, submit a report the linux kernel "
161 "mailinglist together with submitting your code for "
162 "inclusion.\n");
163 }
165 /* Find a symbol, return value, crc and module which owns it */
166 static unsigned long __find_symbol(const char *name,
167 struct module **owner,
168 const unsigned long **crc,
169 int gplok)
170 {
171 struct module *mod;
172 const struct kernel_symbol *ks;
174 /* Core kernel first. */
175 *owner = NULL;
176 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
177 if (ks) {
178 *crc = symversion(__start___kcrctab, (ks - __start___ksymtab));
179 return ks->value;
180 }
181 if (gplok) {
182 ks = lookup_symbol(name, __start___ksymtab_gpl,
183 __stop___ksymtab_gpl);
184 if (ks) {
185 *crc = symversion(__start___kcrctab_gpl,
186 (ks - __start___ksymtab_gpl));
187 return ks->value;
188 }
189 }
190 ks = lookup_symbol(name, __start___ksymtab_gpl_future,
191 __stop___ksymtab_gpl_future);
192 if (ks) {
193 if (!gplok) {
194 printk(KERN_WARNING "Symbol %s is being used "
195 "by a non-GPL module, which will not "
196 "be allowed in the future\n", name);
197 printk(KERN_WARNING "Please see the file "
198 "Documentation/feature-removal-schedule.txt "
199 "in the kernel source tree for more "
200 "details.\n");
201 }
202 *crc = symversion(__start___kcrctab_gpl_future,
203 (ks - __start___ksymtab_gpl_future));
204 return ks->value;
205 }
207 ks = lookup_symbol(name, __start___ksymtab_unused,
208 __stop___ksymtab_unused);
209 if (ks) {
210 printk_unused_warning(name);
211 *crc = symversion(__start___kcrctab_unused,
212 (ks - __start___ksymtab_unused));
213 return ks->value;
214 }
216 if (gplok)
217 ks = lookup_symbol(name, __start___ksymtab_unused_gpl,
218 __stop___ksymtab_unused_gpl);
219 if (ks) {
220 printk_unused_warning(name);
221 *crc = symversion(__start___kcrctab_unused_gpl,
222 (ks - __start___ksymtab_unused_gpl));
223 return ks->value;
224 }
226 /* Now try modules. */
227 list_for_each_entry(mod, &modules, list) {
228 *owner = mod;
229 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
230 if (ks) {
231 *crc = symversion(mod->crcs, (ks - mod->syms));
232 return ks->value;
233 }
235 if (gplok) {
236 ks = lookup_symbol(name, mod->gpl_syms,
237 mod->gpl_syms + mod->num_gpl_syms);
238 if (ks) {
239 *crc = symversion(mod->gpl_crcs,
240 (ks - mod->gpl_syms));
241 return ks->value;
242 }
243 }
244 ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms);
245 if (ks) {
246 printk_unused_warning(name);
247 *crc = symversion(mod->unused_crcs, (ks - mod->unused_syms));
248 return ks->value;
249 }
251 if (gplok) {
252 ks = lookup_symbol(name, mod->unused_gpl_syms,
253 mod->unused_gpl_syms + mod->num_unused_gpl_syms);
254 if (ks) {
255 printk_unused_warning(name);
256 *crc = symversion(mod->unused_gpl_crcs,
257 (ks - mod->unused_gpl_syms));
258 return ks->value;
259 }
260 }
261 ks = lookup_symbol(name, mod->gpl_future_syms,
262 (mod->gpl_future_syms +
263 mod->num_gpl_future_syms));
264 if (ks) {
265 if (!gplok) {
266 printk(KERN_WARNING "Symbol %s is being used "
267 "by a non-GPL module, which will not "
268 "be allowed in the future\n", name);
269 printk(KERN_WARNING "Please see the file "
270 "Documentation/feature-removal-schedule.txt "
271 "in the kernel source tree for more "
272 "details.\n");
273 }
274 *crc = symversion(mod->gpl_future_crcs,
275 (ks - mod->gpl_future_syms));
276 return ks->value;
277 }
278 }
279 DEBUGP("Failed to find symbol %s\n", name);
280 return 0;
281 }
283 /* Search for module by name: must hold module_mutex. */
284 static struct module *find_module(const char *name)
285 {
286 struct module *mod;
288 list_for_each_entry(mod, &modules, list) {
289 if (strcmp(mod->name, name) == 0)
290 return mod;
291 }
292 return NULL;
293 }
295 #ifdef CONFIG_SMP
296 /* Number of blocks used and allocated. */
297 static unsigned int pcpu_num_used, pcpu_num_allocated;
298 /* Size of each block. -ve means used. */
299 static int *pcpu_size;
301 static int split_block(unsigned int i, unsigned short size)
302 {
303 /* Reallocation required? */
304 if (pcpu_num_used + 1 > pcpu_num_allocated) {
305 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2,
306 GFP_KERNEL);
307 if (!new)
308 return 0;
310 memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated);
311 pcpu_num_allocated *= 2;
312 kfree(pcpu_size);
313 pcpu_size = new;
314 }
316 /* Insert a new subblock */
317 memmove(&pcpu_size[i+1], &pcpu_size[i],
318 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
319 pcpu_num_used++;
321 pcpu_size[i+1] -= size;
322 pcpu_size[i] = size;
323 return 1;
324 }
326 static inline unsigned int block_size(int val)
327 {
328 if (val < 0)
329 return -val;
330 return val;
331 }
333 /* Created by linker magic */
334 extern char __per_cpu_start[], __per_cpu_end[];
336 static void *percpu_modalloc(unsigned long size, unsigned long align,
337 const char *name)
338 {
339 unsigned long extra;
340 unsigned int i;
341 void *ptr;
343 if (align > SMP_CACHE_BYTES) {
344 printk(KERN_WARNING "%s: per-cpu alignment %li > %i\n",
345 name, align, SMP_CACHE_BYTES);
346 align = SMP_CACHE_BYTES;
347 }
349 ptr = __per_cpu_start;
350 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
351 /* Extra for alignment requirement. */
352 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
353 BUG_ON(i == 0 && extra != 0);
355 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
356 continue;
358 /* Transfer extra to previous block. */
359 if (pcpu_size[i-1] < 0)
360 pcpu_size[i-1] -= extra;
361 else
362 pcpu_size[i-1] += extra;
363 pcpu_size[i] -= extra;
364 ptr += extra;
366 /* Split block if warranted */
367 if (pcpu_size[i] - size > sizeof(unsigned long))
368 if (!split_block(i, size))
369 return NULL;
371 /* Mark allocated */
372 pcpu_size[i] = -pcpu_size[i];
373 return ptr;
374 }
376 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
377 size);
378 return NULL;
379 }
381 static void percpu_modfree(void *freeme)
382 {
383 unsigned int i;
384 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
386 /* First entry is core kernel percpu data. */
387 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
388 if (ptr == freeme) {
389 pcpu_size[i] = -pcpu_size[i];
390 goto free;
391 }
392 }
393 BUG();
395 free:
396 /* Merge with previous? */
397 if (pcpu_size[i-1] >= 0) {
398 pcpu_size[i-1] += pcpu_size[i];
399 pcpu_num_used--;
400 memmove(&pcpu_size[i], &pcpu_size[i+1],
401 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
402 i--;
403 }
404 /* Merge with next? */
405 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
406 pcpu_size[i] += pcpu_size[i+1];
407 pcpu_num_used--;
408 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
409 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
410 }
411 }
413 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
414 Elf_Shdr *sechdrs,
415 const char *secstrings)
416 {
417 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
418 }
420 static int percpu_modinit(void)
421 {
422 pcpu_num_used = 2;
423 pcpu_num_allocated = 2;
424 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
425 GFP_KERNEL);
426 /* Static in-kernel percpu data (used). */
427 pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES);
428 /* Free room. */
429 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
430 if (pcpu_size[1] < 0) {
431 printk(KERN_ERR "No per-cpu room for modules.\n");
432 pcpu_num_used = 1;
433 }
435 return 0;
436 }
437 __initcall(percpu_modinit);
438 #else /* ... !CONFIG_SMP */
439 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
440 const char *name)
441 {
442 return NULL;
443 }
444 static inline void percpu_modfree(void *pcpuptr)
445 {
446 BUG();
447 }
448 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
449 Elf_Shdr *sechdrs,
450 const char *secstrings)
451 {
452 return 0;
453 }
454 static inline void percpu_modcopy(void *pcpudst, const void *src,
455 unsigned long size)
456 {
457 /* pcpusec should be 0, and size of that section should be 0. */
458 BUG_ON(size != 0);
459 }
460 #endif /* CONFIG_SMP */
462 #define MODINFO_ATTR(field) \
463 static void setup_modinfo_##field(struct module *mod, const char *s) \
464 { \
465 mod->field = kstrdup(s, GFP_KERNEL); \
466 } \
467 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
468 struct module *mod, char *buffer) \
469 { \
470 return sprintf(buffer, "%s\n", mod->field); \
471 } \
472 static int modinfo_##field##_exists(struct module *mod) \
473 { \
474 return mod->field != NULL; \
475 } \
476 static void free_modinfo_##field(struct module *mod) \
477 { \
478 kfree(mod->field); \
479 mod->field = NULL; \
480 } \
481 static struct module_attribute modinfo_##field = { \
482 .attr = { .name = __stringify(field), .mode = 0444, \
483 .owner = THIS_MODULE }, \
484 .show = show_modinfo_##field, \
485 .setup = setup_modinfo_##field, \
486 .test = modinfo_##field##_exists, \
487 .free = free_modinfo_##field, \
488 };
490 MODINFO_ATTR(version);
491 MODINFO_ATTR(srcversion);
493 #ifdef CONFIG_MODULE_UNLOAD
494 /* Init the unload section of the module. */
495 static void module_unload_init(struct module *mod)
496 {
497 unsigned int i;
499 INIT_LIST_HEAD(&mod->modules_which_use_me);
500 for (i = 0; i < NR_CPUS; i++)
501 local_set(&mod->ref[i].count, 0);
502 /* Hold reference count during initialization. */
503 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
504 /* Backwards compatibility macros put refcount during init. */
505 mod->waiter = current;
506 }
508 /* modules using other modules */
509 struct module_use
510 {
511 struct list_head list;
512 struct module *module_which_uses;
513 };
515 /* Does a already use b? */
516 static int already_uses(struct module *a, struct module *b)
517 {
518 struct module_use *use;
520 list_for_each_entry(use, &b->modules_which_use_me, list) {
521 if (use->module_which_uses == a) {
522 DEBUGP("%s uses %s!\n", a->name, b->name);
523 return 1;
524 }
525 }
526 DEBUGP("%s does not use %s!\n", a->name, b->name);
527 return 0;
528 }
530 /* Module a uses b */
531 static int use_module(struct module *a, struct module *b)
532 {
533 struct module_use *use;
534 if (b == NULL || already_uses(a, b)) return 1;
536 if (!strong_try_module_get(b))
537 return 0;
539 DEBUGP("Allocating new usage for %s.\n", a->name);
540 use = kmalloc(sizeof(*use), GFP_ATOMIC);
541 if (!use) {
542 printk("%s: out of memory loading\n", a->name);
543 module_put(b);
544 return 0;
545 }
547 use->module_which_uses = a;
548 list_add(&use->list, &b->modules_which_use_me);
549 return 1;
550 }
552 /* Clear the unload stuff of the module. */
553 static void module_unload_free(struct module *mod)
554 {
555 struct module *i;
557 list_for_each_entry(i, &modules, list) {
558 struct module_use *use;
560 list_for_each_entry(use, &i->modules_which_use_me, list) {
561 if (use->module_which_uses == mod) {
562 DEBUGP("%s unusing %s\n", mod->name, i->name);
563 module_put(i);
564 list_del(&use->list);
565 kfree(use);
566 /* There can be at most one match. */
567 break;
568 }
569 }
570 }
571 }
573 #ifdef CONFIG_MODULE_FORCE_UNLOAD
574 static inline int try_force_unload(unsigned int flags)
575 {
576 int ret = (flags & O_TRUNC);
577 if (ret)
578 add_taint(TAINT_FORCED_RMMOD);
579 return ret;
580 }
581 #else
582 static inline int try_force_unload(unsigned int flags)
583 {
584 return 0;
585 }
586 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
588 struct stopref
589 {
590 struct module *mod;
591 int flags;
592 int *forced;
593 };
595 /* Whole machine is stopped with interrupts off when this runs. */
596 static int __try_stop_module(void *_sref)
597 {
598 struct stopref *sref = _sref;
600 /* If it's not unused, quit unless we are told to block. */
601 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
602 if (!(*sref->forced = try_force_unload(sref->flags)))
603 return -EWOULDBLOCK;
604 }
606 /* Mark it as dying. */
607 sref->mod->state = MODULE_STATE_GOING;
608 return 0;
609 }
611 static int try_stop_module(struct module *mod, int flags, int *forced)
612 {
613 struct stopref sref = { mod, flags, forced };
615 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
616 }
618 unsigned int module_refcount(struct module *mod)
619 {
620 unsigned int i, total = 0;
622 for (i = 0; i < NR_CPUS; i++)
623 total += local_read(&mod->ref[i].count);
624 return total;
625 }
626 EXPORT_SYMBOL(module_refcount);
628 /* This exists whether we can unload or not */
629 static void free_module(struct module *mod);
631 static void wait_for_zero_refcount(struct module *mod)
632 {
633 /* Since we might sleep for some time, drop the semaphore first */
634 mutex_unlock(&module_mutex);
635 for (;;) {
636 DEBUGP("Looking at refcount...\n");
637 set_current_state(TASK_UNINTERRUPTIBLE);
638 if (module_refcount(mod) == 0)
639 break;
640 schedule();
641 }
642 current->state = TASK_RUNNING;
643 mutex_lock(&module_mutex);
644 }
646 asmlinkage long
647 sys_delete_module(const char __user *name_user, unsigned int flags)
648 {
649 struct module *mod;
650 char name[MODULE_NAME_LEN];
651 int ret, forced = 0;
653 if (!capable(CAP_SYS_MODULE))
654 return -EPERM;
656 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
657 return -EFAULT;
658 name[MODULE_NAME_LEN-1] = '\0';
660 if (mutex_lock_interruptible(&module_mutex) != 0)
661 return -EINTR;
663 mod = find_module(name);
664 if (!mod) {
665 ret = -ENOENT;
666 goto out;
667 }
669 if (!list_empty(&mod->modules_which_use_me)) {
670 /* Other modules depend on us: get rid of them first. */
671 ret = -EWOULDBLOCK;
672 goto out;
673 }
675 /* Doing init or already dying? */
676 if (mod->state != MODULE_STATE_LIVE) {
677 /* FIXME: if (force), slam module count and wake up
678 waiter --RR */
679 DEBUGP("%s already dying\n", mod->name);
680 ret = -EBUSY;
681 goto out;
682 }
684 /* If it has an init func, it must have an exit func to unload */
685 if ((mod->init != NULL && mod->exit == NULL)
686 || mod->unsafe) {
687 forced = try_force_unload(flags);
688 if (!forced) {
689 /* This module can't be removed */
690 ret = -EBUSY;
691 goto out;
692 }
693 }
695 /* Set this up before setting mod->state */
696 mod->waiter = current;
698 /* Stop the machine so refcounts can't move and disable module. */
699 ret = try_stop_module(mod, flags, &forced);
700 if (ret != 0)
701 goto out;
703 /* Never wait if forced. */
704 if (!forced && module_refcount(mod) != 0)
705 wait_for_zero_refcount(mod);
707 /* Final destruction now noone is using it. */
708 if (mod->exit != NULL) {
709 mutex_unlock(&module_mutex);
710 mod->exit();
711 mutex_lock(&module_mutex);
712 }
713 free_module(mod);
715 out:
716 mutex_unlock(&module_mutex);
717 return ret;
718 }
720 static void print_unload_info(struct seq_file *m, struct module *mod)
721 {
722 struct module_use *use;
723 int printed_something = 0;
725 seq_printf(m, " %u ", module_refcount(mod));
727 /* Always include a trailing , so userspace can differentiate
728 between this and the old multi-field proc format. */
729 list_for_each_entry(use, &mod->modules_which_use_me, list) {
730 printed_something = 1;
731 seq_printf(m, "%s,", use->module_which_uses->name);
732 }
734 if (mod->unsafe) {
735 printed_something = 1;
736 seq_printf(m, "[unsafe],");
737 }
739 if (mod->init != NULL && mod->exit == NULL) {
740 printed_something = 1;
741 seq_printf(m, "[permanent],");
742 }
744 if (!printed_something)
745 seq_printf(m, "-");
746 }
748 void __symbol_put(const char *symbol)
749 {
750 struct module *owner;
751 unsigned long flags;
752 const unsigned long *crc;
754 spin_lock_irqsave(&modlist_lock, flags);
755 if (!__find_symbol(symbol, &owner, &crc, 1))
756 BUG();
757 module_put(owner);
758 spin_unlock_irqrestore(&modlist_lock, flags);
759 }
760 EXPORT_SYMBOL(__symbol_put);
762 void symbol_put_addr(void *addr)
763 {
764 struct module *modaddr;
766 if (core_kernel_text((unsigned long)addr))
767 return;
769 if (!(modaddr = module_text_address((unsigned long)addr)))
770 BUG();
771 module_put(modaddr);
772 }
773 EXPORT_SYMBOL_GPL(symbol_put_addr);
775 static ssize_t show_refcnt(struct module_attribute *mattr,
776 struct module *mod, char *buffer)
777 {
778 /* sysfs holds a reference */
779 return sprintf(buffer, "%u\n", module_refcount(mod)-1);
780 }
782 static struct module_attribute refcnt = {
783 .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE },
784 .show = show_refcnt,
785 };
787 #else /* !CONFIG_MODULE_UNLOAD */
788 static void print_unload_info(struct seq_file *m, struct module *mod)
789 {
790 /* We don't know the usage count, or what modules are using. */
791 seq_printf(m, " - -");
792 }
794 static inline void module_unload_free(struct module *mod)
795 {
796 }
798 static inline int use_module(struct module *a, struct module *b)
799 {
800 return strong_try_module_get(b);
801 }
803 static inline void module_unload_init(struct module *mod)
804 {
805 }
806 #endif /* CONFIG_MODULE_UNLOAD */
808 static struct module_attribute *modinfo_attrs[] = {
809 &modinfo_version,
810 &modinfo_srcversion,
811 #ifdef CONFIG_MODULE_UNLOAD
812 &refcnt,
813 #endif
814 NULL,
815 };
817 static const char vermagic[] = VERMAGIC_STRING;
819 #ifdef CONFIG_MODVERSIONS
820 static int check_version(Elf_Shdr *sechdrs,
821 unsigned int versindex,
822 const char *symname,
823 struct module *mod,
824 const unsigned long *crc)
825 {
826 unsigned int i, num_versions;
827 struct modversion_info *versions;
829 /* Exporting module didn't supply crcs? OK, we're already tainted. */
830 if (!crc)
831 return 1;
833 versions = (void *) sechdrs[versindex].sh_addr;
834 num_versions = sechdrs[versindex].sh_size
835 / sizeof(struct modversion_info);
837 for (i = 0; i < num_versions; i++) {
838 if (strcmp(versions[i].name, symname) != 0)
839 continue;
841 if (versions[i].crc == *crc)
842 return 1;
843 printk("%s: disagrees about version of symbol %s\n",
844 mod->name, symname);
845 DEBUGP("Found checksum %lX vs module %lX\n",
846 *crc, versions[i].crc);
847 return 0;
848 }
849 /* Not in module's version table. OK, but that taints the kernel. */
850 if (!(tainted & TAINT_FORCED_MODULE)) {
851 printk("%s: no version for \"%s\" found: kernel tainted.\n",
852 mod->name, symname);
853 add_taint(TAINT_FORCED_MODULE);
854 }
855 return 1;
856 }
858 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
859 unsigned int versindex,
860 struct module *mod)
861 {
862 const unsigned long *crc;
863 struct module *owner;
865 if (!__find_symbol("struct_module", &owner, &crc, 1))
866 BUG();
867 return check_version(sechdrs, versindex, "struct_module", mod,
868 crc);
869 }
871 /* First part is kernel version, which we ignore. */
872 static inline int same_magic(const char *amagic, const char *bmagic)
873 {
874 amagic += strcspn(amagic, " ");
875 bmagic += strcspn(bmagic, " ");
876 return strcmp(amagic, bmagic) == 0;
877 }
878 #else
879 static inline int check_version(Elf_Shdr *sechdrs,
880 unsigned int versindex,
881 const char *symname,
882 struct module *mod,
883 const unsigned long *crc)
884 {
885 return 1;
886 }
888 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
889 unsigned int versindex,
890 struct module *mod)
891 {
892 return 1;
893 }
895 static inline int same_magic(const char *amagic, const char *bmagic)
896 {
897 return strcmp(amagic, bmagic) == 0;
898 }
899 #endif /* CONFIG_MODVERSIONS */
901 /* Resolve a symbol for this module. I.e. if we find one, record usage.
902 Must be holding module_mutex. */
903 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
904 unsigned int versindex,
905 const char *name,
906 struct module *mod)
907 {
908 struct module *owner;
909 unsigned long ret;
910 const unsigned long *crc;
912 ret = __find_symbol(name, &owner, &crc, mod->license_gplok);
913 if (ret) {
914 /* use_module can fail due to OOM, or module unloading */
915 if (!check_version(sechdrs, versindex, name, mod, crc) ||
916 !use_module(mod, owner))
917 ret = 0;
918 }
919 return ret;
920 }
923 /*
924 * /sys/module/foo/sections stuff
925 * J. Corbet <corbet@lwn.net>
926 */
927 #ifdef CONFIG_KALLSYMS
928 static ssize_t module_sect_show(struct module_attribute *mattr,
929 struct module *mod, char *buf)
930 {
931 struct module_sect_attr *sattr =
932 container_of(mattr, struct module_sect_attr, mattr);
933 return sprintf(buf, "0x%lx\n", sattr->address);
934 }
936 static void add_sect_attrs(struct module *mod, unsigned int nsect,
937 char *secstrings, Elf_Shdr *sechdrs)
938 {
939 unsigned int nloaded = 0, i, size[2];
940 struct module_sect_attrs *sect_attrs;
941 struct module_sect_attr *sattr;
942 struct attribute **gattr;
944 /* Count loaded sections and allocate structures */
945 for (i = 0; i < nsect; i++)
946 if (sechdrs[i].sh_flags & SHF_ALLOC)
947 nloaded++;
948 size[0] = ALIGN(sizeof(*sect_attrs)
949 + nloaded * sizeof(sect_attrs->attrs[0]),
950 sizeof(sect_attrs->grp.attrs[0]));
951 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
952 if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL)))
953 return;
955 /* Setup section attributes. */
956 sect_attrs->grp.name = "sections";
957 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
959 sattr = &sect_attrs->attrs[0];
960 gattr = &sect_attrs->grp.attrs[0];
961 for (i = 0; i < nsect; i++) {
962 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
963 continue;
964 sattr->address = sechdrs[i].sh_addr;
965 strlcpy(sattr->name, secstrings + sechdrs[i].sh_name,
966 MODULE_SECT_NAME_LEN);
967 sattr->mattr.show = module_sect_show;
968 sattr->mattr.store = NULL;
969 sattr->mattr.attr.name = sattr->name;
970 sattr->mattr.attr.owner = mod;
971 sattr->mattr.attr.mode = S_IRUGO;
972 *(gattr++) = &(sattr++)->mattr.attr;
973 }
974 *gattr = NULL;
976 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
977 goto out;
979 mod->sect_attrs = sect_attrs;
980 return;
981 out:
982 kfree(sect_attrs);
983 }
985 static void remove_sect_attrs(struct module *mod)
986 {
987 if (mod->sect_attrs) {
988 sysfs_remove_group(&mod->mkobj.kobj,
989 &mod->sect_attrs->grp);
990 /* We are positive that no one is using any sect attrs
991 * at this point. Deallocate immediately. */
992 kfree(mod->sect_attrs);
993 mod->sect_attrs = NULL;
994 }
995 }
998 #else
999 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1000 char *sectstrings, Elf_Shdr *sechdrs)
1004 static inline void remove_sect_attrs(struct module *mod)
1007 #endif /* CONFIG_KALLSYMS */
1009 static int module_add_modinfo_attrs(struct module *mod)
1011 struct module_attribute *attr;
1012 struct module_attribute *temp_attr;
1013 int error = 0;
1014 int i;
1016 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1017 (ARRAY_SIZE(modinfo_attrs) + 1)),
1018 GFP_KERNEL);
1019 if (!mod->modinfo_attrs)
1020 return -ENOMEM;
1022 temp_attr = mod->modinfo_attrs;
1023 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1024 if (!attr->test ||
1025 (attr->test && attr->test(mod))) {
1026 memcpy(temp_attr, attr, sizeof(*temp_attr));
1027 temp_attr->attr.owner = mod;
1028 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1029 ++temp_attr;
1032 return error;
1035 static void module_remove_modinfo_attrs(struct module *mod)
1037 struct module_attribute *attr;
1038 int i;
1040 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1041 /* pick a field to test for end of list */
1042 if (!attr->attr.name)
1043 break;
1044 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1045 if (attr->free)
1046 attr->free(mod);
1048 kfree(mod->modinfo_attrs);
1051 static int mod_sysfs_setup(struct module *mod,
1052 struct kernel_param *kparam,
1053 unsigned int num_params)
1055 int err;
1057 if (!module_subsys.kset.subsys) {
1058 printk(KERN_ERR "%s: module_subsys not initialized\n",
1059 mod->name);
1060 err = -EINVAL;
1061 goto out;
1063 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1064 err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name);
1065 if (err)
1066 goto out;
1067 kobj_set_kset_s(&mod->mkobj, module_subsys);
1068 mod->mkobj.mod = mod;
1069 err = kobject_register(&mod->mkobj.kobj);
1070 if (err)
1071 goto out;
1073 err = module_param_sysfs_setup(mod, kparam, num_params);
1074 if (err)
1075 goto out_unreg;
1077 err = module_add_modinfo_attrs(mod);
1078 if (err)
1079 goto out_unreg;
1081 return 0;
1083 out_unreg:
1084 kobject_unregister(&mod->mkobj.kobj);
1085 out:
1086 return err;
1089 static void mod_kobject_remove(struct module *mod)
1091 module_remove_modinfo_attrs(mod);
1092 module_param_sysfs_remove(mod);
1094 kobject_unregister(&mod->mkobj.kobj);
1097 /*
1098 * unlink the module with the whole machine is stopped with interrupts off
1099 * - this defends against kallsyms not taking locks
1100 */
1101 static int __unlink_module(void *_mod)
1103 struct module *mod = _mod;
1104 list_del(&mod->list);
1105 return 0;
1108 /* Free a module, remove from lists, etc (must hold module mutex). */
1109 static void free_module(struct module *mod)
1111 /* Delete from various lists */
1112 stop_machine_run(__unlink_module, mod, NR_CPUS);
1113 remove_sect_attrs(mod);
1114 mod_kobject_remove(mod);
1116 unwind_remove_table(mod->unwind_info, 0);
1118 /* Arch-specific cleanup. */
1119 module_arch_cleanup(mod);
1121 /* Module unload stuff */
1122 module_unload_free(mod);
1124 /* This may be NULL, but that's OK */
1125 module_free(mod, mod->module_init);
1126 kfree(mod->args);
1127 if (mod->percpu)
1128 percpu_modfree(mod->percpu);
1130 /* Free lock-classes: */
1131 lockdep_free_key_range(mod->module_core, mod->core_size);
1133 /* Finally, free the core (containing the module structure) */
1134 module_free(mod, mod->module_core);
1137 void *__symbol_get(const char *symbol)
1139 struct module *owner;
1140 unsigned long value, flags;
1141 const unsigned long *crc;
1143 spin_lock_irqsave(&modlist_lock, flags);
1144 value = __find_symbol(symbol, &owner, &crc, 1);
1145 if (value && !strong_try_module_get(owner))
1146 value = 0;
1147 spin_unlock_irqrestore(&modlist_lock, flags);
1149 return (void *)value;
1151 EXPORT_SYMBOL_GPL(__symbol_get);
1153 /*
1154 * Ensure that an exported symbol [global namespace] does not already exist
1155 * in the Kernel or in some other modules exported symbol table.
1156 */
1157 static int verify_export_symbols(struct module *mod)
1159 const char *name = NULL;
1160 unsigned long i, ret = 0;
1161 struct module *owner;
1162 const unsigned long *crc;
1164 for (i = 0; i < mod->num_syms; i++)
1165 if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
1166 name = mod->syms[i].name;
1167 ret = -ENOEXEC;
1168 goto dup;
1171 for (i = 0; i < mod->num_gpl_syms; i++)
1172 if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) {
1173 name = mod->gpl_syms[i].name;
1174 ret = -ENOEXEC;
1175 goto dup;
1178 dup:
1179 if (ret)
1180 printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
1181 mod->name, name, module_name(owner));
1183 return ret;
1186 /* Change all symbols so that sh_value encodes the pointer directly. */
1187 static int simplify_symbols(Elf_Shdr *sechdrs,
1188 unsigned int symindex,
1189 const char *strtab,
1190 unsigned int versindex,
1191 unsigned int pcpuindex,
1192 struct module *mod)
1194 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1195 unsigned long secbase;
1196 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1197 int ret = 0;
1199 for (i = 1; i < n; i++) {
1200 switch (sym[i].st_shndx) {
1201 case SHN_COMMON:
1202 /* We compiled with -fno-common. These are not
1203 supposed to happen. */
1204 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1205 printk("%s: please compile with -fno-common\n",
1206 mod->name);
1207 ret = -ENOEXEC;
1208 break;
1210 case SHN_ABS:
1211 /* Don't need to do anything */
1212 DEBUGP("Absolute symbol: 0x%08lx\n",
1213 (long)sym[i].st_value);
1214 break;
1216 case SHN_UNDEF:
1217 sym[i].st_value
1218 = resolve_symbol(sechdrs, versindex,
1219 strtab + sym[i].st_name, mod);
1221 /* Ok if resolved. */
1222 if (sym[i].st_value != 0)
1223 break;
1224 /* Ok if weak. */
1225 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1226 break;
1228 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1229 mod->name, strtab + sym[i].st_name);
1230 ret = -ENOENT;
1231 break;
1233 default:
1234 /* Divert to percpu allocation if a percpu var. */
1235 if (sym[i].st_shndx == pcpuindex)
1236 secbase = (unsigned long)mod->percpu;
1237 else
1238 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1239 sym[i].st_value += secbase;
1240 break;
1244 return ret;
1247 /* Update size with this section: return offset. */
1248 static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1250 long ret;
1252 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1253 *size = ret + sechdr->sh_size;
1254 return ret;
1257 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1258 might -- code, read-only data, read-write data, small data. Tally
1259 sizes, and place the offsets into sh_entsize fields: high bit means it
1260 belongs in init. */
1261 static void layout_sections(struct module *mod,
1262 const Elf_Ehdr *hdr,
1263 Elf_Shdr *sechdrs,
1264 const char *secstrings)
1266 static unsigned long const masks[][2] = {
1267 /* NOTE: all executable code must be the first section
1268 * in this array; otherwise modify the text_size
1269 * finder in the two loops below */
1270 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1271 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1272 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1273 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1274 };
1275 unsigned int m, i;
1277 for (i = 0; i < hdr->e_shnum; i++)
1278 sechdrs[i].sh_entsize = ~0UL;
1280 DEBUGP("Core section allocation order:\n");
1281 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1282 for (i = 0; i < hdr->e_shnum; ++i) {
1283 Elf_Shdr *s = &sechdrs[i];
1285 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1286 || (s->sh_flags & masks[m][1])
1287 || s->sh_entsize != ~0UL
1288 || strncmp(secstrings + s->sh_name,
1289 ".init", 5) == 0)
1290 continue;
1291 s->sh_entsize = get_offset(&mod->core_size, s);
1292 DEBUGP("\t%s\n", secstrings + s->sh_name);
1294 if (m == 0)
1295 mod->core_text_size = mod->core_size;
1298 DEBUGP("Init section allocation order:\n");
1299 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1300 for (i = 0; i < hdr->e_shnum; ++i) {
1301 Elf_Shdr *s = &sechdrs[i];
1303 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1304 || (s->sh_flags & masks[m][1])
1305 || s->sh_entsize != ~0UL
1306 || strncmp(secstrings + s->sh_name,
1307 ".init", 5) != 0)
1308 continue;
1309 s->sh_entsize = (get_offset(&mod->init_size, s)
1310 | INIT_OFFSET_MASK);
1311 DEBUGP("\t%s\n", secstrings + s->sh_name);
1313 if (m == 0)
1314 mod->init_text_size = mod->init_size;
1318 static void set_license(struct module *mod, const char *license)
1320 if (!license)
1321 license = "unspecified";
1323 mod->license_gplok = license_is_gpl_compatible(license);
1324 if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) {
1325 printk(KERN_WARNING "%s: module license '%s' taints kernel.\n",
1326 mod->name, license);
1327 add_taint(TAINT_PROPRIETARY_MODULE);
1331 /* Parse tag=value strings from .modinfo section */
1332 static char *next_string(char *string, unsigned long *secsize)
1334 /* Skip non-zero chars */
1335 while (string[0]) {
1336 string++;
1337 if ((*secsize)-- <= 1)
1338 return NULL;
1341 /* Skip any zero padding. */
1342 while (!string[0]) {
1343 string++;
1344 if ((*secsize)-- <= 1)
1345 return NULL;
1347 return string;
1350 static char *get_modinfo(Elf_Shdr *sechdrs,
1351 unsigned int info,
1352 const char *tag)
1354 char *p;
1355 unsigned int taglen = strlen(tag);
1356 unsigned long size = sechdrs[info].sh_size;
1358 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1359 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1360 return p + taglen + 1;
1362 return NULL;
1365 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1366 unsigned int infoindex)
1368 struct module_attribute *attr;
1369 int i;
1371 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1372 if (attr->setup)
1373 attr->setup(mod,
1374 get_modinfo(sechdrs,
1375 infoindex,
1376 attr->attr.name));
1380 #ifdef CONFIG_KALLSYMS
1381 int is_exported(const char *name, const struct module *mod)
1383 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1384 return 1;
1385 else
1386 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
1387 return 1;
1388 else
1389 return 0;
1392 /* As per nm */
1393 static char elf_type(const Elf_Sym *sym,
1394 Elf_Shdr *sechdrs,
1395 const char *secstrings,
1396 struct module *mod)
1398 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1399 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1400 return 'v';
1401 else
1402 return 'w';
1404 if (sym->st_shndx == SHN_UNDEF)
1405 return 'U';
1406 if (sym->st_shndx == SHN_ABS)
1407 return 'a';
1408 if (sym->st_shndx >= SHN_LORESERVE)
1409 return '?';
1410 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1411 return 't';
1412 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1413 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1414 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1415 return 'r';
1416 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1417 return 'g';
1418 else
1419 return 'd';
1421 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1422 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1423 return 's';
1424 else
1425 return 'b';
1427 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1428 ".debug", strlen(".debug")) == 0)
1429 return 'n';
1430 return '?';
1433 static void add_kallsyms(struct module *mod,
1434 Elf_Shdr *sechdrs,
1435 unsigned int symindex,
1436 unsigned int strindex,
1437 const char *secstrings)
1439 unsigned int i;
1441 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1442 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1443 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1445 /* Set types up while we still have access to sections. */
1446 for (i = 0; i < mod->num_symtab; i++)
1447 mod->symtab[i].st_info
1448 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1450 #else
1451 static inline void add_kallsyms(struct module *mod,
1452 Elf_Shdr *sechdrs,
1453 unsigned int symindex,
1454 unsigned int strindex,
1455 const char *secstrings)
1458 #endif /* CONFIG_KALLSYMS */
1460 /* Allocate and load the module: note that size of section 0 is always
1461 zero, and we rely on this for optional sections. */
1462 static struct module *load_module(void __user *umod,
1463 unsigned long len,
1464 const char __user *uargs)
1466 Elf_Ehdr *hdr;
1467 Elf_Shdr *sechdrs;
1468 char *secstrings, *args, *modmagic, *strtab = NULL;
1469 unsigned int i;
1470 unsigned int symindex = 0;
1471 unsigned int strindex = 0;
1472 unsigned int setupindex;
1473 unsigned int exindex;
1474 unsigned int exportindex;
1475 unsigned int modindex;
1476 unsigned int obsparmindex;
1477 unsigned int infoindex;
1478 unsigned int gplindex;
1479 unsigned int crcindex;
1480 unsigned int gplcrcindex;
1481 unsigned int versindex;
1482 unsigned int pcpuindex;
1483 unsigned int gplfutureindex;
1484 unsigned int gplfuturecrcindex;
1485 unsigned int unwindex = 0;
1486 unsigned int unusedindex;
1487 unsigned int unusedcrcindex;
1488 unsigned int unusedgplindex;
1489 unsigned int unusedgplcrcindex;
1490 struct module *mod;
1491 long err = 0;
1492 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1493 struct exception_table_entry *extable;
1494 mm_segment_t old_fs;
1496 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1497 umod, len, uargs);
1498 if (len < sizeof(*hdr))
1499 return ERR_PTR(-ENOEXEC);
1501 /* Suck in entire file: we'll want most of it. */
1502 /* vmalloc barfs on "unusual" numbers. Check here */
1503 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1504 return ERR_PTR(-ENOMEM);
1505 if (copy_from_user(hdr, umod, len) != 0) {
1506 err = -EFAULT;
1507 goto free_hdr;
1510 /* Sanity checks against insmoding binaries or wrong arch,
1511 weird elf version */
1512 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1513 || hdr->e_type != ET_REL
1514 || !elf_check_arch(hdr)
1515 || hdr->e_shentsize != sizeof(*sechdrs)) {
1516 err = -ENOEXEC;
1517 goto free_hdr;
1520 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1521 goto truncated;
1523 /* Convenience variables */
1524 sechdrs = (void *)hdr + hdr->e_shoff;
1525 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1526 sechdrs[0].sh_addr = 0;
1528 for (i = 1; i < hdr->e_shnum; i++) {
1529 if (sechdrs[i].sh_type != SHT_NOBITS
1530 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1531 goto truncated;
1533 /* Mark all sections sh_addr with their address in the
1534 temporary image. */
1535 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1537 /* Internal symbols and strings. */
1538 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1539 symindex = i;
1540 strindex = sechdrs[i].sh_link;
1541 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1543 #ifndef CONFIG_MODULE_UNLOAD
1544 /* Don't load .exit sections */
1545 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1546 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1547 #endif
1550 modindex = find_sec(hdr, sechdrs, secstrings,
1551 ".gnu.linkonce.this_module");
1552 if (!modindex) {
1553 printk(KERN_WARNING "No module found in object\n");
1554 err = -ENOEXEC;
1555 goto free_hdr;
1557 mod = (void *)sechdrs[modindex].sh_addr;
1559 if (symindex == 0) {
1560 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1561 mod->name);
1562 err = -ENOEXEC;
1563 goto free_hdr;
1566 /* Optional sections */
1567 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1568 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1569 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
1570 unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
1571 unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
1572 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1573 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1574 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
1575 unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
1576 unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
1577 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1578 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1579 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1580 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1581 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1582 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1583 #ifdef ARCH_UNWIND_SECTION_NAME
1584 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1585 #endif
1587 /* Don't keep modinfo section */
1588 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1589 #ifdef CONFIG_KALLSYMS
1590 /* Keep symbol and string tables for decoding later. */
1591 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1592 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1593 #endif
1594 if (unwindex)
1595 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
1597 /* Check module struct version now, before we try to use module. */
1598 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1599 err = -ENOEXEC;
1600 goto free_hdr;
1603 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1604 /* This is allowed: modprobe --force will invalidate it. */
1605 if (!modmagic) {
1606 add_taint(TAINT_FORCED_MODULE);
1607 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1608 mod->name);
1609 } else if (!same_magic(modmagic, vermagic)) {
1610 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1611 mod->name, modmagic, vermagic);
1612 err = -ENOEXEC;
1613 goto free_hdr;
1616 /* Now copy in args */
1617 args = strndup_user(uargs, ~0UL >> 1);
1618 if (IS_ERR(args)) {
1619 err = PTR_ERR(args);
1620 goto free_hdr;
1623 if (find_module(mod->name)) {
1624 err = -EEXIST;
1625 goto free_mod;
1628 mod->state = MODULE_STATE_COMING;
1630 /* Allow arches to frob section contents and sizes. */
1631 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1632 if (err < 0)
1633 goto free_mod;
1635 if (pcpuindex) {
1636 /* We have a special allocation for this section. */
1637 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1638 sechdrs[pcpuindex].sh_addralign,
1639 mod->name);
1640 if (!percpu) {
1641 err = -ENOMEM;
1642 goto free_mod;
1644 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1645 mod->percpu = percpu;
1648 /* Determine total sizes, and put offsets in sh_entsize. For now
1649 this is done generically; there doesn't appear to be any
1650 special cases for the architectures. */
1651 layout_sections(mod, hdr, sechdrs, secstrings);
1653 /* Do the allocs. */
1654 ptr = module_alloc(mod->core_size);
1655 if (!ptr) {
1656 err = -ENOMEM;
1657 goto free_percpu;
1659 memset(ptr, 0, mod->core_size);
1660 mod->module_core = ptr;
1662 ptr = module_alloc(mod->init_size);
1663 if (!ptr && mod->init_size) {
1664 err = -ENOMEM;
1665 goto free_core;
1667 memset(ptr, 0, mod->init_size);
1668 mod->module_init = ptr;
1670 /* Transfer each section which specifies SHF_ALLOC */
1671 DEBUGP("final section addresses:\n");
1672 for (i = 0; i < hdr->e_shnum; i++) {
1673 void *dest;
1675 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1676 continue;
1678 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1679 dest = mod->module_init
1680 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1681 else
1682 dest = mod->module_core + sechdrs[i].sh_entsize;
1684 if (sechdrs[i].sh_type != SHT_NOBITS)
1685 memcpy(dest, (void *)sechdrs[i].sh_addr,
1686 sechdrs[i].sh_size);
1687 /* Update sh_addr to point to copy in image. */
1688 sechdrs[i].sh_addr = (unsigned long)dest;
1689 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1691 /* Module has been moved. */
1692 mod = (void *)sechdrs[modindex].sh_addr;
1694 /* Now we've moved module, initialize linked lists, etc. */
1695 module_unload_init(mod);
1697 /* Set up license info based on the info section */
1698 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1700 if (strcmp(mod->name, "ndiswrapper") == 0)
1701 add_taint(TAINT_PROPRIETARY_MODULE);
1702 if (strcmp(mod->name, "driverloader") == 0)
1703 add_taint(TAINT_PROPRIETARY_MODULE);
1705 /* Set up MODINFO_ATTR fields */
1706 setup_modinfo(mod, sechdrs, infoindex);
1708 /* Fix up syms, so that st_value is a pointer to location. */
1709 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1710 mod);
1711 if (err < 0)
1712 goto cleanup;
1714 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1715 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1716 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1717 if (crcindex)
1718 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1719 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1720 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1721 if (gplcrcindex)
1722 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
1723 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
1724 sizeof(*mod->gpl_future_syms);
1725 mod->num_unused_syms = sechdrs[unusedindex].sh_size /
1726 sizeof(*mod->unused_syms);
1727 mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
1728 sizeof(*mod->unused_gpl_syms);
1729 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
1730 if (gplfuturecrcindex)
1731 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
1733 mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
1734 if (unusedcrcindex)
1735 mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
1736 mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
1737 if (unusedgplcrcindex)
1738 mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr;
1740 #ifdef CONFIG_MODVERSIONS
1741 if ((mod->num_syms && !crcindex) ||
1742 (mod->num_gpl_syms && !gplcrcindex) ||
1743 (mod->num_gpl_future_syms && !gplfuturecrcindex) ||
1744 (mod->num_unused_syms && !unusedcrcindex) ||
1745 (mod->num_unused_gpl_syms && !unusedgplcrcindex)) {
1746 printk(KERN_WARNING "%s: No versions for exported symbols."
1747 " Tainting kernel.\n", mod->name);
1748 add_taint(TAINT_FORCED_MODULE);
1750 #endif
1752 /* Now do relocations. */
1753 for (i = 1; i < hdr->e_shnum; i++) {
1754 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1755 unsigned int info = sechdrs[i].sh_info;
1757 /* Not a valid relocation section? */
1758 if (info >= hdr->e_shnum)
1759 continue;
1761 /* Don't bother with non-allocated sections */
1762 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
1763 continue;
1765 if (sechdrs[i].sh_type == SHT_REL)
1766 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
1767 else if (sechdrs[i].sh_type == SHT_RELA)
1768 err = apply_relocate_add(sechdrs, strtab, symindex, i,
1769 mod);
1770 if (err < 0)
1771 goto cleanup;
1774 /* Find duplicate symbols */
1775 err = verify_export_symbols(mod);
1777 if (err < 0)
1778 goto cleanup;
1780 /* Set up and sort exception table */
1781 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
1782 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
1783 sort_extable(extable, extable + mod->num_exentries);
1785 /* Finally, copy percpu area over. */
1786 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
1787 sechdrs[pcpuindex].sh_size);
1789 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
1791 err = module_finalize(hdr, sechdrs, mod);
1792 if (err < 0)
1793 goto cleanup;
1795 /* flush the icache in correct context */
1796 old_fs = get_fs();
1797 set_fs(KERNEL_DS);
1799 /*
1800 * Flush the instruction cache, since we've played with text.
1801 * Do it before processing of module parameters, so the module
1802 * can provide parameter accessor functions of its own.
1803 */
1804 if (mod->module_init)
1805 flush_icache_range((unsigned long)mod->module_init,
1806 (unsigned long)mod->module_init
1807 + mod->init_size);
1808 flush_icache_range((unsigned long)mod->module_core,
1809 (unsigned long)mod->module_core + mod->core_size);
1811 set_fs(old_fs);
1813 mod->args = args;
1814 if (obsparmindex)
1815 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
1816 mod->name);
1818 /* Size of section 0 is 0, so this works well if no params */
1819 err = parse_args(mod->name, mod->args,
1820 (struct kernel_param *)
1821 sechdrs[setupindex].sh_addr,
1822 sechdrs[setupindex].sh_size
1823 / sizeof(struct kernel_param),
1824 NULL);
1825 if (err < 0)
1826 goto arch_cleanup;
1828 err = mod_sysfs_setup(mod,
1829 (struct kernel_param *)
1830 sechdrs[setupindex].sh_addr,
1831 sechdrs[setupindex].sh_size
1832 / sizeof(struct kernel_param));
1833 if (err < 0)
1834 goto arch_cleanup;
1835 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
1837 /* Size of section 0 is 0, so this works well if no unwind info. */
1838 mod->unwind_info = unwind_add_table(mod,
1839 (void *)sechdrs[unwindex].sh_addr,
1840 sechdrs[unwindex].sh_size);
1842 /* Get rid of temporary copy */
1843 vfree(hdr);
1845 /* Done! */
1846 return mod;
1848 arch_cleanup:
1849 module_arch_cleanup(mod);
1850 cleanup:
1851 module_unload_free(mod);
1852 module_free(mod, mod->module_init);
1853 free_core:
1854 module_free(mod, mod->module_core);
1855 free_percpu:
1856 if (percpu)
1857 percpu_modfree(percpu);
1858 free_mod:
1859 kfree(args);
1860 free_hdr:
1861 vfree(hdr);
1862 return ERR_PTR(err);
1864 truncated:
1865 printk(KERN_ERR "Module len %lu truncated\n", len);
1866 err = -ENOEXEC;
1867 goto free_hdr;
1870 /*
1871 * link the module with the whole machine is stopped with interrupts off
1872 * - this defends against kallsyms not taking locks
1873 */
1874 static int __link_module(void *_mod)
1876 struct module *mod = _mod;
1877 list_add(&mod->list, &modules);
1878 return 0;
1881 /* This is where the real work happens */
1882 asmlinkage long
1883 sys_init_module(void __user *umod,
1884 unsigned long len,
1885 const char __user *uargs)
1887 struct module *mod;
1888 int ret = 0;
1890 /* Must have permission */
1891 if (!capable(CAP_SYS_MODULE))
1892 return -EPERM;
1894 /* Only one module load at a time, please */
1895 if (mutex_lock_interruptible(&module_mutex) != 0)
1896 return -EINTR;
1898 /* Do all the hard work */
1899 mod = load_module(umod, len, uargs);
1900 if (IS_ERR(mod)) {
1901 mutex_unlock(&module_mutex);
1902 return PTR_ERR(mod);
1905 /* Now sew it into the lists. They won't access us, since
1906 strong_try_module_get() will fail. */
1907 stop_machine_run(__link_module, mod, NR_CPUS);
1909 /* Drop lock so they can recurse */
1910 mutex_unlock(&module_mutex);
1912 blocking_notifier_call_chain(&module_notify_list,
1913 MODULE_STATE_COMING, mod);
1915 /* Start the module */
1916 if (mod->init != NULL)
1917 ret = mod->init();
1918 if (ret < 0) {
1919 /* Init routine failed: abort. Try to protect us from
1920 buggy refcounters. */
1921 mod->state = MODULE_STATE_GOING;
1922 synchronize_sched();
1923 if (mod->unsafe)
1924 printk(KERN_ERR "%s: module is now stuck!\n",
1925 mod->name);
1926 else {
1927 module_put(mod);
1928 mutex_lock(&module_mutex);
1929 free_module(mod);
1930 mutex_unlock(&module_mutex);
1932 return ret;
1935 /* Now it's a first class citizen! */
1936 mutex_lock(&module_mutex);
1937 mod->state = MODULE_STATE_LIVE;
1938 /* Drop initial reference. */
1939 module_put(mod);
1940 unwind_remove_table(mod->unwind_info, 1);
1941 module_free(mod, mod->module_init);
1942 mod->module_init = NULL;
1943 mod->init_size = 0;
1944 mod->init_text_size = 0;
1945 mutex_unlock(&module_mutex);
1947 return 0;
1950 static inline int within(unsigned long addr, void *start, unsigned long size)
1952 return ((void *)addr >= start && (void *)addr < start + size);
1955 #ifdef CONFIG_KALLSYMS
1956 /*
1957 * This ignores the intensely annoying "mapping symbols" found
1958 * in ARM ELF files: $a, $t and $d.
1959 */
1960 static inline int is_arm_mapping_symbol(const char *str)
1962 return str[0] == '$' && strchr("atd", str[1])
1963 && (str[2] == '\0' || str[2] == '.');
1966 static const char *get_ksymbol(struct module *mod,
1967 unsigned long addr,
1968 unsigned long *size,
1969 unsigned long *offset)
1971 unsigned int i, best = 0;
1972 unsigned long nextval;
1974 /* At worse, next value is at end of module */
1975 if (within(addr, mod->module_init, mod->init_size))
1976 nextval = (unsigned long)mod->module_init+mod->init_text_size;
1977 else
1978 nextval = (unsigned long)mod->module_core+mod->core_text_size;
1980 /* Scan for closest preceeding symbol, and next symbol. (ELF
1981 starts real symbols at 1). */
1982 for (i = 1; i < mod->num_symtab; i++) {
1983 if (mod->symtab[i].st_shndx == SHN_UNDEF)
1984 continue;
1986 /* We ignore unnamed symbols: they're uninformative
1987 * and inserted at a whim. */
1988 if (mod->symtab[i].st_value <= addr
1989 && mod->symtab[i].st_value > mod->symtab[best].st_value
1990 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
1991 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
1992 best = i;
1993 if (mod->symtab[i].st_value > addr
1994 && mod->symtab[i].st_value < nextval
1995 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
1996 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
1997 nextval = mod->symtab[i].st_value;
2000 if (!best)
2001 return NULL;
2003 *size = nextval - mod->symtab[best].st_value;
2004 *offset = addr - mod->symtab[best].st_value;
2005 return mod->strtab + mod->symtab[best].st_name;
2008 /* For kallsyms to ask for address resolution. NULL means not found.
2009 We don't lock, as this is used for oops resolution and races are a
2010 lesser concern. */
2011 const char *module_address_lookup(unsigned long addr,
2012 unsigned long *size,
2013 unsigned long *offset,
2014 char **modname)
2016 struct module *mod;
2018 list_for_each_entry(mod, &modules, list) {
2019 if (within(addr, mod->module_init, mod->init_size)
2020 || within(addr, mod->module_core, mod->core_size)) {
2021 *modname = mod->name;
2022 return get_ksymbol(mod, addr, size, offset);
2025 return NULL;
2028 struct module *module_get_kallsym(unsigned int symnum, unsigned long *value,
2029 char *type, char *name, size_t namelen)
2031 struct module *mod;
2033 mutex_lock(&module_mutex);
2034 list_for_each_entry(mod, &modules, list) {
2035 if (symnum < mod->num_symtab) {
2036 *value = mod->symtab[symnum].st_value;
2037 *type = mod->symtab[symnum].st_info;
2038 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2039 namelen);
2040 mutex_unlock(&module_mutex);
2041 return mod;
2043 symnum -= mod->num_symtab;
2045 mutex_unlock(&module_mutex);
2046 return NULL;
2049 static unsigned long mod_find_symname(struct module *mod, const char *name)
2051 unsigned int i;
2053 for (i = 0; i < mod->num_symtab; i++)
2054 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2055 mod->symtab[i].st_info != 'U')
2056 return mod->symtab[i].st_value;
2057 return 0;
2060 /* Look for this name: can be of form module:name. */
2061 unsigned long module_kallsyms_lookup_name(const char *name)
2063 struct module *mod;
2064 char *colon;
2065 unsigned long ret = 0;
2067 /* Don't lock: we're in enough trouble already. */
2068 if ((colon = strchr(name, ':')) != NULL) {
2069 *colon = '\0';
2070 if ((mod = find_module(name)) != NULL)
2071 ret = mod_find_symname(mod, colon+1);
2072 *colon = ':';
2073 } else {
2074 list_for_each_entry(mod, &modules, list)
2075 if ((ret = mod_find_symname(mod, name)) != 0)
2076 break;
2078 return ret;
2080 #endif /* CONFIG_KALLSYMS */
2082 /* Called by the /proc file system to return a list of modules. */
2083 static void *m_start(struct seq_file *m, loff_t *pos)
2085 struct list_head *i;
2086 loff_t n = 0;
2088 mutex_lock(&module_mutex);
2089 list_for_each(i, &modules) {
2090 if (n++ == *pos)
2091 break;
2093 if (i == &modules)
2094 return NULL;
2095 return i;
2098 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2100 struct list_head *i = p;
2101 (*pos)++;
2102 if (i->next == &modules)
2103 return NULL;
2104 return i->next;
2107 static void m_stop(struct seq_file *m, void *p)
2109 mutex_unlock(&module_mutex);
2112 static int m_show(struct seq_file *m, void *p)
2114 struct module *mod = list_entry(p, struct module, list);
2115 seq_printf(m, "%s %lu",
2116 mod->name, mod->init_size + mod->core_size);
2117 print_unload_info(m, mod);
2119 /* Informative for users. */
2120 seq_printf(m, " %s",
2121 mod->state == MODULE_STATE_GOING ? "Unloading":
2122 mod->state == MODULE_STATE_COMING ? "Loading":
2123 "Live");
2124 /* Used by oprofile and other similar tools. */
2125 seq_printf(m, " 0x%p", mod->module_core);
2127 seq_printf(m, "\n");
2128 return 0;
2131 /* Format: modulename size refcount deps address
2133 Where refcount is a number or -, and deps is a comma-separated list
2134 of depends or -.
2135 */
2136 struct seq_operations modules_op = {
2137 .start = m_start,
2138 .next = m_next,
2139 .stop = m_stop,
2140 .show = m_show
2141 };
2143 /* Given an address, look for it in the module exception tables. */
2144 const struct exception_table_entry *search_module_extables(unsigned long addr)
2146 unsigned long flags;
2147 const struct exception_table_entry *e = NULL;
2148 struct module *mod;
2150 spin_lock_irqsave(&modlist_lock, flags);
2151 list_for_each_entry(mod, &modules, list) {
2152 if (mod->num_exentries == 0)
2153 continue;
2155 e = search_extable(mod->extable,
2156 mod->extable + mod->num_exentries - 1,
2157 addr);
2158 if (e)
2159 break;
2161 spin_unlock_irqrestore(&modlist_lock, flags);
2163 /* Now, if we found one, we are running inside it now, hence
2164 we cannot unload the module, hence no refcnt needed. */
2165 return e;
2168 /*
2169 * Is this a valid module address?
2170 */
2171 int is_module_address(unsigned long addr)
2173 unsigned long flags;
2174 struct module *mod;
2176 spin_lock_irqsave(&modlist_lock, flags);
2178 list_for_each_entry(mod, &modules, list) {
2179 if (within(addr, mod->module_core, mod->core_size)) {
2180 spin_unlock_irqrestore(&modlist_lock, flags);
2181 return 1;
2185 spin_unlock_irqrestore(&modlist_lock, flags);
2187 return 0;
2191 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2192 struct module *__module_text_address(unsigned long addr)
2194 struct module *mod;
2196 list_for_each_entry(mod, &modules, list)
2197 if (within(addr, mod->module_init, mod->init_text_size)
2198 || within(addr, mod->module_core, mod->core_text_size))
2199 return mod;
2200 return NULL;
2203 struct module *module_text_address(unsigned long addr)
2205 struct module *mod;
2206 unsigned long flags;
2208 spin_lock_irqsave(&modlist_lock, flags);
2209 mod = __module_text_address(addr);
2210 spin_unlock_irqrestore(&modlist_lock, flags);
2212 return mod;
2215 /* Don't grab lock, we're oopsing. */
2216 void print_modules(void)
2218 struct module *mod;
2220 printk("Modules linked in:");
2221 list_for_each_entry(mod, &modules, list)
2222 printk(" %s", mod->name);
2223 printk("\n");
2226 void module_add_driver(struct module *mod, struct device_driver *drv)
2228 if (!mod || !drv)
2229 return;
2231 /* Don't check return code; this call is idempotent */
2232 sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module");
2234 EXPORT_SYMBOL(module_add_driver);
2236 void module_remove_driver(struct device_driver *drv)
2238 if (!drv)
2239 return;
2240 sysfs_remove_link(&drv->kobj, "module");
2242 EXPORT_SYMBOL(module_remove_driver);
2244 #ifdef CONFIG_MODVERSIONS
2245 /* Generate the signature for struct module here, too, for modversions. */
2246 void struct_module(struct module *mod) { return; }
2247 EXPORT_SYMBOL(struct_module);
2248 #endif