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PCI: add the sysfs driver name to all modules
[linux-2.6.22.y-op.git] / kernel / module.c
blob9de4209f6a67ff5eba1e50c707d19373224a9a7a
1 /*
2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19 #include <linux/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/sched.h>
38 #include <linux/stop_machine.h>
39 #include <linux/device.h>
40 #include <linux/string.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>
47
48 #if 0
49 #define DEBUGP printk
50 #else
51 #define DEBUGP(fmt , a...)
52 #endif
53
54 #ifndef ARCH_SHF_SMALL
55 #define ARCH_SHF_SMALL 0
56 #endif
57
58 /* If this is set, the section belongs in the init part of the module */
59 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
60
61 /* Protects module list */
62 static DEFINE_SPINLOCK(modlist_lock);
63
64 /* List of modules, protected by module_mutex AND modlist_lock */
65 static DEFINE_MUTEX(module_mutex);
66 static LIST_HEAD(modules);
67
68 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
69
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);
75
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);
81
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 }
89
90 static inline void add_taint_module(struct module *mod, unsigned flag)
91 {
92 add_taint(flag);
93 mod->taints |= flag;
94 }
95
96 /* A thread that wants to hold a reference to a module only while it
97 * is running can call ths to safely exit.
98 * nfsd and lockd use this.
99 */
100 void __module_put_and_exit(struct module *mod, long code)
101 {
102 module_put(mod);
103 do_exit(code);
104 }
105 EXPORT_SYMBOL(__module_put_and_exit);
106
107 /* Find a module section: 0 means not found. */
108 static unsigned int find_sec(Elf_Ehdr *hdr,
109 Elf_Shdr *sechdrs,
110 const char *secstrings,
111 const char *name)
112 {
113 unsigned int i;
114
115 for (i = 1; i < hdr->e_shnum; i++)
116 /* Alloc bit cleared means "ignore it." */
117 if ((sechdrs[i].sh_flags & SHF_ALLOC)
118 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
119 return i;
120 return 0;
121 }
122
123 /* Provided by the linker */
124 extern const struct kernel_symbol __start___ksymtab[];
125 extern const struct kernel_symbol __stop___ksymtab[];
126 extern const struct kernel_symbol __start___ksymtab_gpl[];
127 extern const struct kernel_symbol __stop___ksymtab_gpl[];
128 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
129 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
130 extern const struct kernel_symbol __start___ksymtab_unused[];
131 extern const struct kernel_symbol __stop___ksymtab_unused[];
132 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
133 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
134 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
135 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
136 extern const unsigned long __start___kcrctab[];
137 extern const unsigned long __start___kcrctab_gpl[];
138 extern const unsigned long __start___kcrctab_gpl_future[];
139 extern const unsigned long __start___kcrctab_unused[];
140 extern const unsigned long __start___kcrctab_unused_gpl[];
141
142 #ifndef CONFIG_MODVERSIONS
143 #define symversion(base, idx) NULL
144 #else
145 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
146 #endif
147
148 /* lookup symbol in given range of kernel_symbols */
149 static const struct kernel_symbol *lookup_symbol(const char *name,
150 const struct kernel_symbol *start,
151 const struct kernel_symbol *stop)
152 {
153 const struct kernel_symbol *ks = start;
154 for (; ks < stop; ks++)
155 if (strcmp(ks->name, name) == 0)
156 return ks;
157 return NULL;
158 }
159
160 static void printk_unused_warning(const char *name)
161 {
162 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
163 "however this module is using it.\n", name);
164 printk(KERN_WARNING "This symbol will go away in the future.\n");
165 printk(KERN_WARNING "Please evalute if this is the right api to use, "
166 "and if it really is, submit a report the linux kernel "
167 "mailinglist together with submitting your code for "
168 "inclusion.\n");
169 }
170
171 /* Find a symbol, return value, crc and module which owns it */
172 static unsigned long __find_symbol(const char *name,
173 struct module **owner,
174 const unsigned long **crc,
175 int gplok)
176 {
177 struct module *mod;
178 const struct kernel_symbol *ks;
179
180 /* Core kernel first. */
181 *owner = NULL;
182 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
183 if (ks) {
184 *crc = symversion(__start___kcrctab, (ks - __start___ksymtab));
185 return ks->value;
186 }
187 if (gplok) {
188 ks = lookup_symbol(name, __start___ksymtab_gpl,
189 __stop___ksymtab_gpl);
190 if (ks) {
191 *crc = symversion(__start___kcrctab_gpl,
192 (ks - __start___ksymtab_gpl));
193 return ks->value;
194 }
195 }
196 ks = lookup_symbol(name, __start___ksymtab_gpl_future,
197 __stop___ksymtab_gpl_future);
198 if (ks) {
199 if (!gplok) {
200 printk(KERN_WARNING "Symbol %s is being used "
201 "by a non-GPL module, which will not "
202 "be allowed in the future\n", name);
203 printk(KERN_WARNING "Please see the file "
204 "Documentation/feature-removal-schedule.txt "
205 "in the kernel source tree for more "
206 "details.\n");
207 }
208 *crc = symversion(__start___kcrctab_gpl_future,
209 (ks - __start___ksymtab_gpl_future));
210 return ks->value;
211 }
212
213 ks = lookup_symbol(name, __start___ksymtab_unused,
214 __stop___ksymtab_unused);
215 if (ks) {
216 printk_unused_warning(name);
217 *crc = symversion(__start___kcrctab_unused,
218 (ks - __start___ksymtab_unused));
219 return ks->value;
220 }
221
222 if (gplok)
223 ks = lookup_symbol(name, __start___ksymtab_unused_gpl,
224 __stop___ksymtab_unused_gpl);
225 if (ks) {
226 printk_unused_warning(name);
227 *crc = symversion(__start___kcrctab_unused_gpl,
228 (ks - __start___ksymtab_unused_gpl));
229 return ks->value;
230 }
231
232 /* Now try modules. */
233 list_for_each_entry(mod, &modules, list) {
234 *owner = mod;
235 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
236 if (ks) {
237 *crc = symversion(mod->crcs, (ks - mod->syms));
238 return ks->value;
239 }
240
241 if (gplok) {
242 ks = lookup_symbol(name, mod->gpl_syms,
243 mod->gpl_syms + mod->num_gpl_syms);
244 if (ks) {
245 *crc = symversion(mod->gpl_crcs,
246 (ks - mod->gpl_syms));
247 return ks->value;
248 }
249 }
250 ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms);
251 if (ks) {
252 printk_unused_warning(name);
253 *crc = symversion(mod->unused_crcs, (ks - mod->unused_syms));
254 return ks->value;
255 }
256
257 if (gplok) {
258 ks = lookup_symbol(name, mod->unused_gpl_syms,
259 mod->unused_gpl_syms + mod->num_unused_gpl_syms);
260 if (ks) {
261 printk_unused_warning(name);
262 *crc = symversion(mod->unused_gpl_crcs,
263 (ks - mod->unused_gpl_syms));
264 return ks->value;
265 }
266 }
267 ks = lookup_symbol(name, mod->gpl_future_syms,
268 (mod->gpl_future_syms +
269 mod->num_gpl_future_syms));
270 if (ks) {
271 if (!gplok) {
272 printk(KERN_WARNING "Symbol %s is being used "
273 "by a non-GPL module, which will not "
274 "be allowed in the future\n", name);
275 printk(KERN_WARNING "Please see the file "
276 "Documentation/feature-removal-schedule.txt "
277 "in the kernel source tree for more "
278 "details.\n");
279 }
280 *crc = symversion(mod->gpl_future_crcs,
281 (ks - mod->gpl_future_syms));
282 return ks->value;
283 }
284 }
285 DEBUGP("Failed to find symbol %s\n", name);
286 return 0;
287 }
288
289 /* Search for module by name: must hold module_mutex. */
290 static struct module *find_module(const char *name)
291 {
292 struct module *mod;
293
294 list_for_each_entry(mod, &modules, list) {
295 if (strcmp(mod->name, name) == 0)
296 return mod;
297 }
298 return NULL;
299 }
300
301 #ifdef CONFIG_SMP
302 /* Number of blocks used and allocated. */
303 static unsigned int pcpu_num_used, pcpu_num_allocated;
304 /* Size of each block. -ve means used. */
305 static int *pcpu_size;
306
307 static int split_block(unsigned int i, unsigned short size)
308 {
309 /* Reallocation required? */
310 if (pcpu_num_used + 1 > pcpu_num_allocated) {
311 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2,
312 GFP_KERNEL);
313 if (!new)
314 return 0;
315
316 memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated);
317 pcpu_num_allocated *= 2;
318 kfree(pcpu_size);
319 pcpu_size = new;
320 }
321
322 /* Insert a new subblock */
323 memmove(&pcpu_size[i+1], &pcpu_size[i],
324 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
325 pcpu_num_used++;
326
327 pcpu_size[i+1] -= size;
328 pcpu_size[i] = size;
329 return 1;
330 }
331
332 static inline unsigned int block_size(int val)
333 {
334 if (val < 0)
335 return -val;
336 return val;
337 }
338
339 /* Created by linker magic */
340 extern char __per_cpu_start[], __per_cpu_end[];
341
342 static void *percpu_modalloc(unsigned long size, unsigned long align,
343 const char *name)
344 {
345 unsigned long extra;
346 unsigned int i;
347 void *ptr;
348
349 if (align > SMP_CACHE_BYTES) {
350 printk(KERN_WARNING "%s: per-cpu alignment %li > %i\n",
351 name, align, SMP_CACHE_BYTES);
352 align = SMP_CACHE_BYTES;
353 }
354
355 ptr = __per_cpu_start;
356 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
357 /* Extra for alignment requirement. */
358 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
359 BUG_ON(i == 0 && extra != 0);
360
361 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
362 continue;
363
364 /* Transfer extra to previous block. */
365 if (pcpu_size[i-1] < 0)
366 pcpu_size[i-1] -= extra;
367 else
368 pcpu_size[i-1] += extra;
369 pcpu_size[i] -= extra;
370 ptr += extra;
371
372 /* Split block if warranted */
373 if (pcpu_size[i] - size > sizeof(unsigned long))
374 if (!split_block(i, size))
375 return NULL;
376
377 /* Mark allocated */
378 pcpu_size[i] = -pcpu_size[i];
379 return ptr;
380 }
381
382 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
383 size);
384 return NULL;
385 }
386
387 static void percpu_modfree(void *freeme)
388 {
389 unsigned int i;
390 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
391
392 /* First entry is core kernel percpu data. */
393 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
394 if (ptr == freeme) {
395 pcpu_size[i] = -pcpu_size[i];
396 goto free;
397 }
398 }
399 BUG();
400
401 free:
402 /* Merge with previous? */
403 if (pcpu_size[i-1] >= 0) {
404 pcpu_size[i-1] += pcpu_size[i];
405 pcpu_num_used--;
406 memmove(&pcpu_size[i], &pcpu_size[i+1],
407 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
408 i--;
409 }
410 /* Merge with next? */
411 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
412 pcpu_size[i] += pcpu_size[i+1];
413 pcpu_num_used--;
414 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
415 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
416 }
417 }
418
419 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
420 Elf_Shdr *sechdrs,
421 const char *secstrings)
422 {
423 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
424 }
425
426 static int percpu_modinit(void)
427 {
428 pcpu_num_used = 2;
429 pcpu_num_allocated = 2;
430 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
431 GFP_KERNEL);
432 /* Static in-kernel percpu data (used). */
433 pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES);
434 /* Free room. */
435 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
436 if (pcpu_size[1] < 0) {
437 printk(KERN_ERR "No per-cpu room for modules.\n");
438 pcpu_num_used = 1;
439 }
440
441 return 0;
442 }
443 __initcall(percpu_modinit);
444 #else /* ... !CONFIG_SMP */
445 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
446 const char *name)
447 {
448 return NULL;
449 }
450 static inline void percpu_modfree(void *pcpuptr)
451 {
452 BUG();
453 }
454 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
455 Elf_Shdr *sechdrs,
456 const char *secstrings)
457 {
458 return 0;
459 }
460 static inline void percpu_modcopy(void *pcpudst, const void *src,
461 unsigned long size)
462 {
463 /* pcpusec should be 0, and size of that section should be 0. */
464 BUG_ON(size != 0);
465 }
466 #endif /* CONFIG_SMP */
467
468 #define MODINFO_ATTR(field) \
469 static void setup_modinfo_##field(struct module *mod, const char *s) \
470 { \
471 mod->field = kstrdup(s, GFP_KERNEL); \
472 } \
473 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
474 struct module *mod, char *buffer) \
475 { \
476 return sprintf(buffer, "%s\n", mod->field); \
477 } \
478 static int modinfo_##field##_exists(struct module *mod) \
479 { \
480 return mod->field != NULL; \
481 } \
482 static void free_modinfo_##field(struct module *mod) \
483 { \
484 kfree(mod->field); \
485 mod->field = NULL; \
486 } \
487 static struct module_attribute modinfo_##field = { \
488 .attr = { .name = __stringify(field), .mode = 0444, \
489 .owner = THIS_MODULE }, \
490 .show = show_modinfo_##field, \
491 .setup = setup_modinfo_##field, \
492 .test = modinfo_##field##_exists, \
493 .free = free_modinfo_##field, \
494 };
495
496 MODINFO_ATTR(version);
497 MODINFO_ATTR(srcversion);
498
499 #ifdef CONFIG_MODULE_UNLOAD
500 /* Init the unload section of the module. */
501 static void module_unload_init(struct module *mod)
502 {
503 unsigned int i;
504
505 INIT_LIST_HEAD(&mod->modules_which_use_me);
506 for (i = 0; i < NR_CPUS; i++)
507 local_set(&mod->ref[i].count, 0);
508 /* Hold reference count during initialization. */
509 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
510 /* Backwards compatibility macros put refcount during init. */
511 mod->waiter = current;
512 }
513
514 /* modules using other modules */
515 struct module_use
516 {
517 struct list_head list;
518 struct module *module_which_uses;
519 };
520
521 /* Does a already use b? */
522 static int already_uses(struct module *a, struct module *b)
523 {
524 struct module_use *use;
525
526 list_for_each_entry(use, &b->modules_which_use_me, list) {
527 if (use->module_which_uses == a) {
528 DEBUGP("%s uses %s!\n", a->name, b->name);
529 return 1;
530 }
531 }
532 DEBUGP("%s does not use %s!\n", a->name, b->name);
533 return 0;
534 }
535
536 /* Module a uses b */
537 static int use_module(struct module *a, struct module *b)
538 {
539 struct module_use *use;
540 if (b == NULL || already_uses(a, b)) return 1;
541
542 if (!strong_try_module_get(b))
543 return 0;
544
545 DEBUGP("Allocating new usage for %s.\n", a->name);
546 use = kmalloc(sizeof(*use), GFP_ATOMIC);
547 if (!use) {
548 printk("%s: out of memory loading\n", a->name);
549 module_put(b);
550 return 0;
551 }
552
553 use->module_which_uses = a;
554 list_add(&use->list, &b->modules_which_use_me);
555 return 1;
556 }
557
558 /* Clear the unload stuff of the module. */
559 static void module_unload_free(struct module *mod)
560 {
561 struct module *i;
562
563 list_for_each_entry(i, &modules, list) {
564 struct module_use *use;
565
566 list_for_each_entry(use, &i->modules_which_use_me, list) {
567 if (use->module_which_uses == mod) {
568 DEBUGP("%s unusing %s\n", mod->name, i->name);
569 module_put(i);
570 list_del(&use->list);
571 kfree(use);
572 /* There can be at most one match. */
573 break;
574 }
575 }
576 }
577 }
578
579 #ifdef CONFIG_MODULE_FORCE_UNLOAD
580 static inline int try_force_unload(unsigned int flags)
581 {
582 int ret = (flags & O_TRUNC);
583 if (ret)
584 add_taint(TAINT_FORCED_RMMOD);
585 return ret;
586 }
587 #else
588 static inline int try_force_unload(unsigned int flags)
589 {
590 return 0;
591 }
592 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
593
594 struct stopref
595 {
596 struct module *mod;
597 int flags;
598 int *forced;
599 };
600
601 /* Whole machine is stopped with interrupts off when this runs. */
602 static int __try_stop_module(void *_sref)
603 {
604 struct stopref *sref = _sref;
605
606 /* If it's not unused, quit unless we are told to block. */
607 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
608 if (!(*sref->forced = try_force_unload(sref->flags)))
609 return -EWOULDBLOCK;
610 }
611
612 /* Mark it as dying. */
613 sref->mod->state = MODULE_STATE_GOING;
614 return 0;
615 }
616
617 static int try_stop_module(struct module *mod, int flags, int *forced)
618 {
619 struct stopref sref = { mod, flags, forced };
620
621 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
622 }
623
624 unsigned int module_refcount(struct module *mod)
625 {
626 unsigned int i, total = 0;
627
628 for (i = 0; i < NR_CPUS; i++)
629 total += local_read(&mod->ref[i].count);
630 return total;
631 }
632 EXPORT_SYMBOL(module_refcount);
633
634 /* This exists whether we can unload or not */
635 static void free_module(struct module *mod);
636
637 static void wait_for_zero_refcount(struct module *mod)
638 {
639 /* Since we might sleep for some time, drop the semaphore first */
640 mutex_unlock(&module_mutex);
641 for (;;) {
642 DEBUGP("Looking at refcount...\n");
643 set_current_state(TASK_UNINTERRUPTIBLE);
644 if (module_refcount(mod) == 0)
645 break;
646 schedule();
647 }
648 current->state = TASK_RUNNING;
649 mutex_lock(&module_mutex);
650 }
651
652 asmlinkage long
653 sys_delete_module(const char __user *name_user, unsigned int flags)
654 {
655 struct module *mod;
656 char name[MODULE_NAME_LEN];
657 int ret, forced = 0;
658
659 if (!capable(CAP_SYS_MODULE))
660 return -EPERM;
661
662 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
663 return -EFAULT;
664 name[MODULE_NAME_LEN-1] = '\0';
665
666 if (mutex_lock_interruptible(&module_mutex) != 0)
667 return -EINTR;
668
669 mod = find_module(name);
670 if (!mod) {
671 ret = -ENOENT;
672 goto out;
673 }
674
675 if (!list_empty(&mod->modules_which_use_me)) {
676 /* Other modules depend on us: get rid of them first. */
677 ret = -EWOULDBLOCK;
678 goto out;
679 }
680
681 /* Doing init or already dying? */
682 if (mod->state != MODULE_STATE_LIVE) {
683 /* FIXME: if (force), slam module count and wake up
684 waiter --RR */
685 DEBUGP("%s already dying\n", mod->name);
686 ret = -EBUSY;
687 goto out;
688 }
689
690 /* If it has an init func, it must have an exit func to unload */
691 if ((mod->init != NULL && mod->exit == NULL)
692 || mod->unsafe) {
693 forced = try_force_unload(flags);
694 if (!forced) {
695 /* This module can't be removed */
696 ret = -EBUSY;
697 goto out;
698 }
699 }
700
701 /* Set this up before setting mod->state */
702 mod->waiter = current;
703
704 /* Stop the machine so refcounts can't move and disable module. */
705 ret = try_stop_module(mod, flags, &forced);
706 if (ret != 0)
707 goto out;
708
709 /* Never wait if forced. */
710 if (!forced && module_refcount(mod) != 0)
711 wait_for_zero_refcount(mod);
712
713 /* Final destruction now noone is using it. */
714 if (mod->exit != NULL) {
715 mutex_unlock(&module_mutex);
716 mod->exit();
717 mutex_lock(&module_mutex);
718 }
719 free_module(mod);
720
721 out:
722 mutex_unlock(&module_mutex);
723 return ret;
724 }
725
726 static void print_unload_info(struct seq_file *m, struct module *mod)
727 {
728 struct module_use *use;
729 int printed_something = 0;
730
731 seq_printf(m, " %u ", module_refcount(mod));
732
733 /* Always include a trailing , so userspace can differentiate
734 between this and the old multi-field proc format. */
735 list_for_each_entry(use, &mod->modules_which_use_me, list) {
736 printed_something = 1;
737 seq_printf(m, "%s,", use->module_which_uses->name);
738 }
739
740 if (mod->unsafe) {
741 printed_something = 1;
742 seq_printf(m, "[unsafe],");
743 }
744
745 if (mod->init != NULL && mod->exit == NULL) {
746 printed_something = 1;
747 seq_printf(m, "[permanent],");
748 }
749
750 if (!printed_something)
751 seq_printf(m, "-");
752 }
753
754 void __symbol_put(const char *symbol)
755 {
756 struct module *owner;
757 unsigned long flags;
758 const unsigned long *crc;
759
760 spin_lock_irqsave(&modlist_lock, flags);
761 if (!__find_symbol(symbol, &owner, &crc, 1))
762 BUG();
763 module_put(owner);
764 spin_unlock_irqrestore(&modlist_lock, flags);
765 }
766 EXPORT_SYMBOL(__symbol_put);
767
768 void symbol_put_addr(void *addr)
769 {
770 struct module *modaddr;
771
772 if (core_kernel_text((unsigned long)addr))
773 return;
774
775 if (!(modaddr = module_text_address((unsigned long)addr)))
776 BUG();
777 module_put(modaddr);
778 }
779 EXPORT_SYMBOL_GPL(symbol_put_addr);
780
781 static ssize_t show_refcnt(struct module_attribute *mattr,
782 struct module *mod, char *buffer)
783 {
784 /* sysfs holds a reference */
785 return sprintf(buffer, "%u\n", module_refcount(mod)-1);
786 }
787
788 static struct module_attribute refcnt = {
789 .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE },
790 .show = show_refcnt,
791 };
792
793 void module_put(struct module *module)
794 {
795 if (module) {
796 unsigned int cpu = get_cpu();
797 local_dec(&module->ref[cpu].count);
798 /* Maybe they're waiting for us to drop reference? */
799 if (unlikely(!module_is_live(module)))
800 wake_up_process(module->waiter);
801 put_cpu();
802 }
803 }
804 EXPORT_SYMBOL(module_put);
805
806 #else /* !CONFIG_MODULE_UNLOAD */
807 static void print_unload_info(struct seq_file *m, struct module *mod)
808 {
809 /* We don't know the usage count, or what modules are using. */
810 seq_printf(m, " - -");
811 }
812
813 static inline void module_unload_free(struct module *mod)
814 {
815 }
816
817 static inline int use_module(struct module *a, struct module *b)
818 {
819 return strong_try_module_get(b);
820 }
821
822 static inline void module_unload_init(struct module *mod)
823 {
824 }
825 #endif /* CONFIG_MODULE_UNLOAD */
826
827 static ssize_t show_initstate(struct module_attribute *mattr,
828 struct module *mod, char *buffer)
829 {
830 const char *state = "unknown";
831
832 switch (mod->state) {
833 case MODULE_STATE_LIVE:
834 state = "live";
835 break;
836 case MODULE_STATE_COMING:
837 state = "coming";
838 break;
839 case MODULE_STATE_GOING:
840 state = "going";
841 break;
842 }
843 return sprintf(buffer, "%s\n", state);
844 }
845
846 static struct module_attribute initstate = {
847 .attr = { .name = "initstate", .mode = 0444, .owner = THIS_MODULE },
848 .show = show_initstate,
849 };
850
851 static struct module_attribute *modinfo_attrs[] = {
852 &modinfo_version,
853 &modinfo_srcversion,
854 &initstate,
855 #ifdef CONFIG_MODULE_UNLOAD
856 &refcnt,
857 #endif
858 NULL,
859 };
860
861 static const char vermagic[] = VERMAGIC_STRING;
862
863 #ifdef CONFIG_MODVERSIONS
864 static int check_version(Elf_Shdr *sechdrs,
865 unsigned int versindex,
866 const char *symname,
867 struct module *mod,
868 const unsigned long *crc)
869 {
870 unsigned int i, num_versions;
871 struct modversion_info *versions;
872
873 /* Exporting module didn't supply crcs? OK, we're already tainted. */
874 if (!crc)
875 return 1;
876
877 versions = (void *) sechdrs[versindex].sh_addr;
878 num_versions = sechdrs[versindex].sh_size
879 / sizeof(struct modversion_info);
880
881 for (i = 0; i < num_versions; i++) {
882 if (strcmp(versions[i].name, symname) != 0)
883 continue;
884
885 if (versions[i].crc == *crc)
886 return 1;
887 printk("%s: disagrees about version of symbol %s\n",
888 mod->name, symname);
889 DEBUGP("Found checksum %lX vs module %lX\n",
890 *crc, versions[i].crc);
891 return 0;
892 }
893 /* Not in module's version table. OK, but that taints the kernel. */
894 if (!(tainted & TAINT_FORCED_MODULE))
895 printk("%s: no version for \"%s\" found: kernel tainted.\n",
896 mod->name, symname);
897 add_taint_module(mod, TAINT_FORCED_MODULE);
898 return 1;
899 }
900
901 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
902 unsigned int versindex,
903 struct module *mod)
904 {
905 const unsigned long *crc;
906 struct module *owner;
907
908 if (!__find_symbol("struct_module", &owner, &crc, 1))
909 BUG();
910 return check_version(sechdrs, versindex, "struct_module", mod,
911 crc);
912 }
913
914 /* First part is kernel version, which we ignore. */
915 static inline int same_magic(const char *amagic, const char *bmagic)
916 {
917 amagic += strcspn(amagic, " ");
918 bmagic += strcspn(bmagic, " ");
919 return strcmp(amagic, bmagic) == 0;
920 }
921 #else
922 static inline int check_version(Elf_Shdr *sechdrs,
923 unsigned int versindex,
924 const char *symname,
925 struct module *mod,
926 const unsigned long *crc)
927 {
928 return 1;
929 }
930
931 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
932 unsigned int versindex,
933 struct module *mod)
934 {
935 return 1;
936 }
937
938 static inline int same_magic(const char *amagic, const char *bmagic)
939 {
940 return strcmp(amagic, bmagic) == 0;
941 }
942 #endif /* CONFIG_MODVERSIONS */
943
944 /* Resolve a symbol for this module. I.e. if we find one, record usage.
945 Must be holding module_mutex. */
946 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
947 unsigned int versindex,
948 const char *name,
949 struct module *mod)
950 {
951 struct module *owner;
952 unsigned long ret;
953 const unsigned long *crc;
954
955 ret = __find_symbol(name, &owner, &crc,
956 !(mod->taints & TAINT_PROPRIETARY_MODULE));
957 if (ret) {
958 /* use_module can fail due to OOM, or module unloading */
959 if (!check_version(sechdrs, versindex, name, mod, crc) ||
960 !use_module(mod, owner))
961 ret = 0;
962 }
963 return ret;
964 }
965
966
967 /*
968 * /sys/module/foo/sections stuff
969 * J. Corbet <corbet@lwn.net>
970 */
971 #ifdef CONFIG_KALLSYMS
972 static ssize_t module_sect_show(struct module_attribute *mattr,
973 struct module *mod, char *buf)
974 {
975 struct module_sect_attr *sattr =
976 container_of(mattr, struct module_sect_attr, mattr);
977 return sprintf(buf, "0x%lx\n", sattr->address);
978 }
979
980 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
981 {
982 int section;
983
984 for (section = 0; section < sect_attrs->nsections; section++)
985 kfree(sect_attrs->attrs[section].name);
986 kfree(sect_attrs);
987 }
988
989 static void add_sect_attrs(struct module *mod, unsigned int nsect,
990 char *secstrings, Elf_Shdr *sechdrs)
991 {
992 unsigned int nloaded = 0, i, size[2];
993 struct module_sect_attrs *sect_attrs;
994 struct module_sect_attr *sattr;
995 struct attribute **gattr;
996
997 /* Count loaded sections and allocate structures */
998 for (i = 0; i < nsect; i++)
999 if (sechdrs[i].sh_flags & SHF_ALLOC)
1000 nloaded++;
1001 size[0] = ALIGN(sizeof(*sect_attrs)
1002 + nloaded * sizeof(sect_attrs->attrs[0]),
1003 sizeof(sect_attrs->grp.attrs[0]));
1004 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1005 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1006 if (sect_attrs == NULL)
1007 return;
1008
1009 /* Setup section attributes. */
1010 sect_attrs->grp.name = "sections";
1011 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1012
1013 sect_attrs->nsections = 0;
1014 sattr = &sect_attrs->attrs[0];
1015 gattr = &sect_attrs->grp.attrs[0];
1016 for (i = 0; i < nsect; i++) {
1017 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1018 continue;
1019 sattr->address = sechdrs[i].sh_addr;
1020 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1021 GFP_KERNEL);
1022 if (sattr->name == NULL)
1023 goto out;
1024 sect_attrs->nsections++;
1025 sattr->mattr.show = module_sect_show;
1026 sattr->mattr.store = NULL;
1027 sattr->mattr.attr.name = sattr->name;
1028 sattr->mattr.attr.owner = mod;
1029 sattr->mattr.attr.mode = S_IRUGO;
1030 *(gattr++) = &(sattr++)->mattr.attr;
1031 }
1032 *gattr = NULL;
1033
1034 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1035 goto out;
1036
1037 mod->sect_attrs = sect_attrs;
1038 return;
1039 out:
1040 free_sect_attrs(sect_attrs);
1041 }
1042
1043 static void remove_sect_attrs(struct module *mod)
1044 {
1045 if (mod->sect_attrs) {
1046 sysfs_remove_group(&mod->mkobj.kobj,
1047 &mod->sect_attrs->grp);
1048 /* We are positive that no one is using any sect attrs
1049 * at this point. Deallocate immediately. */
1050 free_sect_attrs(mod->sect_attrs);
1051 mod->sect_attrs = NULL;
1052 }
1053 }
1054
1055 #else
1056
1057 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1058 char *sectstrings, Elf_Shdr *sechdrs)
1059 {
1060 }
1061
1062 static inline void remove_sect_attrs(struct module *mod)
1063 {
1064 }
1065 #endif /* CONFIG_KALLSYMS */
1066
1067 static int module_add_modinfo_attrs(struct module *mod)
1068 {
1069 struct module_attribute *attr;
1070 struct module_attribute *temp_attr;
1071 int error = 0;
1072 int i;
1073
1074 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1075 (ARRAY_SIZE(modinfo_attrs) + 1)),
1076 GFP_KERNEL);
1077 if (!mod->modinfo_attrs)
1078 return -ENOMEM;
1079
1080 temp_attr = mod->modinfo_attrs;
1081 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1082 if (!attr->test ||
1083 (attr->test && attr->test(mod))) {
1084 memcpy(temp_attr, attr, sizeof(*temp_attr));
1085 temp_attr->attr.owner = mod;
1086 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1087 ++temp_attr;
1088 }
1089 }
1090 return error;
1091 }
1092
1093 static void module_remove_modinfo_attrs(struct module *mod)
1094 {
1095 struct module_attribute *attr;
1096 int i;
1097
1098 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1099 /* pick a field to test for end of list */
1100 if (!attr->attr.name)
1101 break;
1102 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1103 if (attr->free)
1104 attr->free(mod);
1105 }
1106 kfree(mod->modinfo_attrs);
1107 }
1108
1109 static int mod_sysfs_setup(struct module *mod,
1110 struct kernel_param *kparam,
1111 unsigned int num_params)
1112 {
1113 int err;
1114
1115 if (!module_subsys.kset.subsys) {
1116 printk(KERN_ERR "%s: module_subsys not initialized\n",
1117 mod->name);
1118 err = -EINVAL;
1119 goto out;
1120 }
1121 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1122 err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name);
1123 if (err)
1124 goto out;
1125 kobj_set_kset_s(&mod->mkobj, module_subsys);
1126 mod->mkobj.mod = mod;
1127
1128 /* delay uevent until full sysfs population */
1129 kobject_init(&mod->mkobj.kobj);
1130 err = kobject_add(&mod->mkobj.kobj);
1131 if (err)
1132 goto out;
1133
1134 err = module_param_sysfs_setup(mod, kparam, num_params);
1135 if (err)
1136 goto out_unreg_drivers;
1137
1138 err = module_add_modinfo_attrs(mod);
1139 if (err)
1140 goto out_unreg_param;
1141
1142 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1143 return 0;
1144
1145 out_unreg_param:
1146 module_param_sysfs_remove(mod);
1147 out_unreg_drivers:
1148 kobject_del(&mod->mkobj.kobj);
1149 kobject_put(&mod->mkobj.kobj);
1150 out:
1151 return err;
1152 }
1153
1154 static void mod_kobject_remove(struct module *mod)
1155 {
1156 module_remove_modinfo_attrs(mod);
1157 module_param_sysfs_remove(mod);
1158 if (mod->mkobj.drivers_dir)
1159 kobject_unregister(mod->mkobj.drivers_dir);
1160
1161 kobject_unregister(&mod->mkobj.kobj);
1162 }
1163
1164 /*
1165 * unlink the module with the whole machine is stopped with interrupts off
1166 * - this defends against kallsyms not taking locks
1167 */
1168 static int __unlink_module(void *_mod)
1169 {
1170 struct module *mod = _mod;
1171 list_del(&mod->list);
1172 return 0;
1173 }
1174
1175 /* Free a module, remove from lists, etc (must hold module mutex). */
1176 static void free_module(struct module *mod)
1177 {
1178 /* Delete from various lists */
1179 stop_machine_run(__unlink_module, mod, NR_CPUS);
1180 remove_sect_attrs(mod);
1181 mod_kobject_remove(mod);
1182
1183 unwind_remove_table(mod->unwind_info, 0);
1184
1185 /* Arch-specific cleanup. */
1186 module_arch_cleanup(mod);
1187
1188 /* Module unload stuff */
1189 module_unload_free(mod);
1190
1191 /* This may be NULL, but that's OK */
1192 module_free(mod, mod->module_init);
1193 kfree(mod->args);
1194 if (mod->percpu)
1195 percpu_modfree(mod->percpu);
1196
1197 /* Free lock-classes: */
1198 lockdep_free_key_range(mod->module_core, mod->core_size);
1199
1200 /* Finally, free the core (containing the module structure) */
1201 module_free(mod, mod->module_core);
1202 }
1203
1204 void *__symbol_get(const char *symbol)
1205 {
1206 struct module *owner;
1207 unsigned long value, flags;
1208 const unsigned long *crc;
1209
1210 spin_lock_irqsave(&modlist_lock, flags);
1211 value = __find_symbol(symbol, &owner, &crc, 1);
1212 if (value && !strong_try_module_get(owner))
1213 value = 0;
1214 spin_unlock_irqrestore(&modlist_lock, flags);
1215
1216 return (void *)value;
1217 }
1218 EXPORT_SYMBOL_GPL(__symbol_get);
1219
1220 /*
1221 * Ensure that an exported symbol [global namespace] does not already exist
1222 * in the Kernel or in some other modules exported symbol table.
1223 */
1224 static int verify_export_symbols(struct module *mod)
1225 {
1226 const char *name = NULL;
1227 unsigned long i, ret = 0;
1228 struct module *owner;
1229 const unsigned long *crc;
1230
1231 for (i = 0; i < mod->num_syms; i++)
1232 if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
1233 name = mod->syms[i].name;
1234 ret = -ENOEXEC;
1235 goto dup;
1236 }
1237
1238 for (i = 0; i < mod->num_gpl_syms; i++)
1239 if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) {
1240 name = mod->gpl_syms[i].name;
1241 ret = -ENOEXEC;
1242 goto dup;
1243 }
1244
1245 dup:
1246 if (ret)
1247 printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
1248 mod->name, name, module_name(owner));
1249
1250 return ret;
1251 }
1252
1253 /* Change all symbols so that sh_value encodes the pointer directly. */
1254 static int simplify_symbols(Elf_Shdr *sechdrs,
1255 unsigned int symindex,
1256 const char *strtab,
1257 unsigned int versindex,
1258 unsigned int pcpuindex,
1259 struct module *mod)
1260 {
1261 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1262 unsigned long secbase;
1263 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1264 int ret = 0;
1265
1266 for (i = 1; i < n; i++) {
1267 switch (sym[i].st_shndx) {
1268 case SHN_COMMON:
1269 /* We compiled with -fno-common. These are not
1270 supposed to happen. */
1271 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1272 printk("%s: please compile with -fno-common\n",
1273 mod->name);
1274 ret = -ENOEXEC;
1275 break;
1276
1277 case SHN_ABS:
1278 /* Don't need to do anything */
1279 DEBUGP("Absolute symbol: 0x%08lx\n",
1280 (long)sym[i].st_value);
1281 break;
1282
1283 case SHN_UNDEF:
1284 sym[i].st_value
1285 = resolve_symbol(sechdrs, versindex,
1286 strtab + sym[i].st_name, mod);
1287
1288 /* Ok if resolved. */
1289 if (sym[i].st_value != 0)
1290 break;
1291 /* Ok if weak. */
1292 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1293 break;
1294
1295 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1296 mod->name, strtab + sym[i].st_name);
1297 ret = -ENOENT;
1298 break;
1299
1300 default:
1301 /* Divert to percpu allocation if a percpu var. */
1302 if (sym[i].st_shndx == pcpuindex)
1303 secbase = (unsigned long)mod->percpu;
1304 else
1305 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1306 sym[i].st_value += secbase;
1307 break;
1308 }
1309 }
1310
1311 return ret;
1312 }
1313
1314 /* Update size with this section: return offset. */
1315 static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1316 {
1317 long ret;
1318
1319 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1320 *size = ret + sechdr->sh_size;
1321 return ret;
1322 }
1323
1324 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1325 might -- code, read-only data, read-write data, small data. Tally
1326 sizes, and place the offsets into sh_entsize fields: high bit means it
1327 belongs in init. */
1328 static void layout_sections(struct module *mod,
1329 const Elf_Ehdr *hdr,
1330 Elf_Shdr *sechdrs,
1331 const char *secstrings)
1332 {
1333 static unsigned long const masks[][2] = {
1334 /* NOTE: all executable code must be the first section
1335 * in this array; otherwise modify the text_size
1336 * finder in the two loops below */
1337 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1338 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1339 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1340 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1341 };
1342 unsigned int m, i;
1343
1344 for (i = 0; i < hdr->e_shnum; i++)
1345 sechdrs[i].sh_entsize = ~0UL;
1346
1347 DEBUGP("Core section allocation order:\n");
1348 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1349 for (i = 0; i < hdr->e_shnum; ++i) {
1350 Elf_Shdr *s = &sechdrs[i];
1351
1352 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1353 || (s->sh_flags & masks[m][1])
1354 || s->sh_entsize != ~0UL
1355 || strncmp(secstrings + s->sh_name,
1356 ".init", 5) == 0)
1357 continue;
1358 s->sh_entsize = get_offset(&mod->core_size, s);
1359 DEBUGP("\t%s\n", secstrings + s->sh_name);
1360 }
1361 if (m == 0)
1362 mod->core_text_size = mod->core_size;
1363 }
1364
1365 DEBUGP("Init section allocation order:\n");
1366 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1367 for (i = 0; i < hdr->e_shnum; ++i) {
1368 Elf_Shdr *s = &sechdrs[i];
1369
1370 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1371 || (s->sh_flags & masks[m][1])
1372 || s->sh_entsize != ~0UL
1373 || strncmp(secstrings + s->sh_name,
1374 ".init", 5) != 0)
1375 continue;
1376 s->sh_entsize = (get_offset(&mod->init_size, s)
1377 | INIT_OFFSET_MASK);
1378 DEBUGP("\t%s\n", secstrings + s->sh_name);
1379 }
1380 if (m == 0)
1381 mod->init_text_size = mod->init_size;
1382 }
1383 }
1384
1385 static void set_license(struct module *mod, const char *license)
1386 {
1387 if (!license)
1388 license = "unspecified";
1389
1390 if (!license_is_gpl_compatible(license)) {
1391 if (!(tainted & TAINT_PROPRIETARY_MODULE))
1392 printk(KERN_WARNING "%s: module license '%s' taints "
1393 "kernel.\n", mod->name, license);
1394 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1395 }
1396 }
1397
1398 /* Parse tag=value strings from .modinfo section */
1399 static char *next_string(char *string, unsigned long *secsize)
1400 {
1401 /* Skip non-zero chars */
1402 while (string[0]) {
1403 string++;
1404 if ((*secsize)-- <= 1)
1405 return NULL;
1406 }
1407
1408 /* Skip any zero padding. */
1409 while (!string[0]) {
1410 string++;
1411 if ((*secsize)-- <= 1)
1412 return NULL;
1413 }
1414 return string;
1415 }
1416
1417 static char *get_modinfo(Elf_Shdr *sechdrs,
1418 unsigned int info,
1419 const char *tag)
1420 {
1421 char *p;
1422 unsigned int taglen = strlen(tag);
1423 unsigned long size = sechdrs[info].sh_size;
1424
1425 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1426 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1427 return p + taglen + 1;
1428 }
1429 return NULL;
1430 }
1431
1432 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1433 unsigned int infoindex)
1434 {
1435 struct module_attribute *attr;
1436 int i;
1437
1438 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1439 if (attr->setup)
1440 attr->setup(mod,
1441 get_modinfo(sechdrs,
1442 infoindex,
1443 attr->attr.name));
1444 }
1445 }
1446
1447 #ifdef CONFIG_KALLSYMS
1448 int is_exported(const char *name, const struct module *mod)
1449 {
1450 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1451 return 1;
1452 else
1453 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
1454 return 1;
1455 else
1456 return 0;
1457 }
1458
1459 /* As per nm */
1460 static char elf_type(const Elf_Sym *sym,
1461 Elf_Shdr *sechdrs,
1462 const char *secstrings,
1463 struct module *mod)
1464 {
1465 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1466 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1467 return 'v';
1468 else
1469 return 'w';
1470 }
1471 if (sym->st_shndx == SHN_UNDEF)
1472 return 'U';
1473 if (sym->st_shndx == SHN_ABS)
1474 return 'a';
1475 if (sym->st_shndx >= SHN_LORESERVE)
1476 return '?';
1477 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1478 return 't';
1479 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1480 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1481 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1482 return 'r';
1483 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1484 return 'g';
1485 else
1486 return 'd';
1487 }
1488 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1489 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1490 return 's';
1491 else
1492 return 'b';
1493 }
1494 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1495 ".debug", strlen(".debug")) == 0)
1496 return 'n';
1497 return '?';
1498 }
1499
1500 static void add_kallsyms(struct module *mod,
1501 Elf_Shdr *sechdrs,
1502 unsigned int symindex,
1503 unsigned int strindex,
1504 const char *secstrings)
1505 {
1506 unsigned int i;
1507
1508 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1509 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1510 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1511
1512 /* Set types up while we still have access to sections. */
1513 for (i = 0; i < mod->num_symtab; i++)
1514 mod->symtab[i].st_info
1515 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1516 }
1517 #else
1518 static inline void add_kallsyms(struct module *mod,
1519 Elf_Shdr *sechdrs,
1520 unsigned int symindex,
1521 unsigned int strindex,
1522 const char *secstrings)
1523 {
1524 }
1525 #endif /* CONFIG_KALLSYMS */
1526
1527 /* Allocate and load the module: note that size of section 0 is always
1528 zero, and we rely on this for optional sections. */
1529 static struct module *load_module(void __user *umod,
1530 unsigned long len,
1531 const char __user *uargs)
1532 {
1533 Elf_Ehdr *hdr;
1534 Elf_Shdr *sechdrs;
1535 char *secstrings, *args, *modmagic, *strtab = NULL;
1536 unsigned int i;
1537 unsigned int symindex = 0;
1538 unsigned int strindex = 0;
1539 unsigned int setupindex;
1540 unsigned int exindex;
1541 unsigned int exportindex;
1542 unsigned int modindex;
1543 unsigned int obsparmindex;
1544 unsigned int infoindex;
1545 unsigned int gplindex;
1546 unsigned int crcindex;
1547 unsigned int gplcrcindex;
1548 unsigned int versindex;
1549 unsigned int pcpuindex;
1550 unsigned int gplfutureindex;
1551 unsigned int gplfuturecrcindex;
1552 unsigned int unwindex = 0;
1553 unsigned int unusedindex;
1554 unsigned int unusedcrcindex;
1555 unsigned int unusedgplindex;
1556 unsigned int unusedgplcrcindex;
1557 struct module *mod;
1558 long err = 0;
1559 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1560 struct exception_table_entry *extable;
1561 mm_segment_t old_fs;
1562
1563 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1564 umod, len, uargs);
1565 if (len < sizeof(*hdr))
1566 return ERR_PTR(-ENOEXEC);
1567
1568 /* Suck in entire file: we'll want most of it. */
1569 /* vmalloc barfs on "unusual" numbers. Check here */
1570 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1571 return ERR_PTR(-ENOMEM);
1572 if (copy_from_user(hdr, umod, len) != 0) {
1573 err = -EFAULT;
1574 goto free_hdr;
1575 }
1576
1577 /* Sanity checks against insmoding binaries or wrong arch,
1578 weird elf version */
1579 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1580 || hdr->e_type != ET_REL
1581 || !elf_check_arch(hdr)
1582 || hdr->e_shentsize != sizeof(*sechdrs)) {
1583 err = -ENOEXEC;
1584 goto free_hdr;
1585 }
1586
1587 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1588 goto truncated;
1589
1590 /* Convenience variables */
1591 sechdrs = (void *)hdr + hdr->e_shoff;
1592 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1593 sechdrs[0].sh_addr = 0;
1594
1595 for (i = 1; i < hdr->e_shnum; i++) {
1596 if (sechdrs[i].sh_type != SHT_NOBITS
1597 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1598 goto truncated;
1599
1600 /* Mark all sections sh_addr with their address in the
1601 temporary image. */
1602 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1603
1604 /* Internal symbols and strings. */
1605 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1606 symindex = i;
1607 strindex = sechdrs[i].sh_link;
1608 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1609 }
1610 #ifndef CONFIG_MODULE_UNLOAD
1611 /* Don't load .exit sections */
1612 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1613 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1614 #endif
1615 }
1616
1617 modindex = find_sec(hdr, sechdrs, secstrings,
1618 ".gnu.linkonce.this_module");
1619 if (!modindex) {
1620 printk(KERN_WARNING "No module found in object\n");
1621 err = -ENOEXEC;
1622 goto free_hdr;
1623 }
1624 mod = (void *)sechdrs[modindex].sh_addr;
1625
1626 if (symindex == 0) {
1627 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1628 mod->name);
1629 err = -ENOEXEC;
1630 goto free_hdr;
1631 }
1632
1633 /* Optional sections */
1634 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1635 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1636 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
1637 unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
1638 unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
1639 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1640 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1641 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
1642 unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
1643 unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
1644 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1645 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1646 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1647 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1648 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1649 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1650 #ifdef ARCH_UNWIND_SECTION_NAME
1651 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1652 #endif
1653
1654 /* Don't keep modinfo section */
1655 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1656 #ifdef CONFIG_KALLSYMS
1657 /* Keep symbol and string tables for decoding later. */
1658 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1659 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1660 #endif
1661 if (unwindex)
1662 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
1663
1664 /* Check module struct version now, before we try to use module. */
1665 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1666 err = -ENOEXEC;
1667 goto free_hdr;
1668 }
1669
1670 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1671 /* This is allowed: modprobe --force will invalidate it. */
1672 if (!modmagic) {
1673 add_taint_module(mod, TAINT_FORCED_MODULE);
1674 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1675 mod->name);
1676 } else if (!same_magic(modmagic, vermagic)) {
1677 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1678 mod->name, modmagic, vermagic);
1679 err = -ENOEXEC;
1680 goto free_hdr;
1681 }
1682
1683 /* Now copy in args */
1684 args = strndup_user(uargs, ~0UL >> 1);
1685 if (IS_ERR(args)) {
1686 err = PTR_ERR(args);
1687 goto free_hdr;
1688 }
1689
1690 if (find_module(mod->name)) {
1691 err = -EEXIST;
1692 goto free_mod;
1693 }
1694
1695 mod->state = MODULE_STATE_COMING;
1696
1697 /* Allow arches to frob section contents and sizes. */
1698 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1699 if (err < 0)
1700 goto free_mod;
1701
1702 if (pcpuindex) {
1703 /* We have a special allocation for this section. */
1704 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1705 sechdrs[pcpuindex].sh_addralign,
1706 mod->name);
1707 if (!percpu) {
1708 err = -ENOMEM;
1709 goto free_mod;
1710 }
1711 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1712 mod->percpu = percpu;
1713 }
1714
1715 /* Determine total sizes, and put offsets in sh_entsize. For now
1716 this is done generically; there doesn't appear to be any
1717 special cases for the architectures. */
1718 layout_sections(mod, hdr, sechdrs, secstrings);
1719
1720 /* Do the allocs. */
1721 ptr = module_alloc(mod->core_size);
1722 if (!ptr) {
1723 err = -ENOMEM;
1724 goto free_percpu;
1725 }
1726 memset(ptr, 0, mod->core_size);
1727 mod->module_core = ptr;
1728
1729 ptr = module_alloc(mod->init_size);
1730 if (!ptr && mod->init_size) {
1731 err = -ENOMEM;
1732 goto free_core;
1733 }
1734 memset(ptr, 0, mod->init_size);
1735 mod->module_init = ptr;
1736
1737 /* Transfer each section which specifies SHF_ALLOC */
1738 DEBUGP("final section addresses:\n");
1739 for (i = 0; i < hdr->e_shnum; i++) {
1740 void *dest;
1741
1742 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1743 continue;
1744
1745 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1746 dest = mod->module_init
1747 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1748 else
1749 dest = mod->module_core + sechdrs[i].sh_entsize;
1750
1751 if (sechdrs[i].sh_type != SHT_NOBITS)
1752 memcpy(dest, (void *)sechdrs[i].sh_addr,
1753 sechdrs[i].sh_size);
1754 /* Update sh_addr to point to copy in image. */
1755 sechdrs[i].sh_addr = (unsigned long)dest;
1756 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1757 }
1758 /* Module has been moved. */
1759 mod = (void *)sechdrs[modindex].sh_addr;
1760
1761 /* Now we've moved module, initialize linked lists, etc. */
1762 module_unload_init(mod);
1763
1764 /* Set up license info based on the info section */
1765 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1766
1767 if (strcmp(mod->name, "ndiswrapper") == 0)
1768 add_taint(TAINT_PROPRIETARY_MODULE);
1769 if (strcmp(mod->name, "driverloader") == 0)
1770 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1771
1772 /* Set up MODINFO_ATTR fields */
1773 setup_modinfo(mod, sechdrs, infoindex);
1774
1775 /* Fix up syms, so that st_value is a pointer to location. */
1776 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1777 mod);
1778 if (err < 0)
1779 goto cleanup;
1780
1781 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1782 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1783 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1784 if (crcindex)
1785 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1786 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1787 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1788 if (gplcrcindex)
1789 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
1790 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
1791 sizeof(*mod->gpl_future_syms);
1792 mod->num_unused_syms = sechdrs[unusedindex].sh_size /
1793 sizeof(*mod->unused_syms);
1794 mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
1795 sizeof(*mod->unused_gpl_syms);
1796 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
1797 if (gplfuturecrcindex)
1798 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
1799
1800 mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
1801 if (unusedcrcindex)
1802 mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
1803 mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
1804 if (unusedgplcrcindex)
1805 mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr;
1806
1807 #ifdef CONFIG_MODVERSIONS
1808 if ((mod->num_syms && !crcindex) ||
1809 (mod->num_gpl_syms && !gplcrcindex) ||
1810 (mod->num_gpl_future_syms && !gplfuturecrcindex) ||
1811 (mod->num_unused_syms && !unusedcrcindex) ||
1812 (mod->num_unused_gpl_syms && !unusedgplcrcindex)) {
1813 printk(KERN_WARNING "%s: No versions for exported symbols."
1814 " Tainting kernel.\n", mod->name);
1815 add_taint_module(mod, TAINT_FORCED_MODULE);
1816 }
1817 #endif
1818
1819 /* Now do relocations. */
1820 for (i = 1; i < hdr->e_shnum; i++) {
1821 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1822 unsigned int info = sechdrs[i].sh_info;
1823
1824 /* Not a valid relocation section? */
1825 if (info >= hdr->e_shnum)
1826 continue;
1827
1828 /* Don't bother with non-allocated sections */
1829 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
1830 continue;
1831
1832 if (sechdrs[i].sh_type == SHT_REL)
1833 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
1834 else if (sechdrs[i].sh_type == SHT_RELA)
1835 err = apply_relocate_add(sechdrs, strtab, symindex, i,
1836 mod);
1837 if (err < 0)
1838 goto cleanup;
1839 }
1840
1841 /* Find duplicate symbols */
1842 err = verify_export_symbols(mod);
1843
1844 if (err < 0)
1845 goto cleanup;
1846
1847 /* Set up and sort exception table */
1848 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
1849 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
1850 sort_extable(extable, extable + mod->num_exentries);
1851
1852 /* Finally, copy percpu area over. */
1853 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
1854 sechdrs[pcpuindex].sh_size);
1855
1856 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
1857
1858 err = module_finalize(hdr, sechdrs, mod);
1859 if (err < 0)
1860 goto cleanup;
1861
1862 /* flush the icache in correct context */
1863 old_fs = get_fs();
1864 set_fs(KERNEL_DS);
1865
1866 /*
1867 * Flush the instruction cache, since we've played with text.
1868 * Do it before processing of module parameters, so the module
1869 * can provide parameter accessor functions of its own.
1870 */
1871 if (mod->module_init)
1872 flush_icache_range((unsigned long)mod->module_init,
1873 (unsigned long)mod->module_init
1874 + mod->init_size);
1875 flush_icache_range((unsigned long)mod->module_core,
1876 (unsigned long)mod->module_core + mod->core_size);
1877
1878 set_fs(old_fs);
1879
1880 mod->args = args;
1881 if (obsparmindex)
1882 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
1883 mod->name);
1884
1885 /* Size of section 0 is 0, so this works well if no params */
1886 err = parse_args(mod->name, mod->args,
1887 (struct kernel_param *)
1888 sechdrs[setupindex].sh_addr,
1889 sechdrs[setupindex].sh_size
1890 / sizeof(struct kernel_param),
1891 NULL);
1892 if (err < 0)
1893 goto arch_cleanup;
1894
1895 err = mod_sysfs_setup(mod,
1896 (struct kernel_param *)
1897 sechdrs[setupindex].sh_addr,
1898 sechdrs[setupindex].sh_size
1899 / sizeof(struct kernel_param));
1900 if (err < 0)
1901 goto arch_cleanup;
1902 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
1903
1904 /* Size of section 0 is 0, so this works well if no unwind info. */
1905 mod->unwind_info = unwind_add_table(mod,
1906 (void *)sechdrs[unwindex].sh_addr,
1907 sechdrs[unwindex].sh_size);
1908
1909 /* Get rid of temporary copy */
1910 vfree(hdr);
1911
1912 /* Done! */
1913 return mod;
1914
1915 arch_cleanup:
1916 module_arch_cleanup(mod);
1917 cleanup:
1918 module_unload_free(mod);
1919 module_free(mod, mod->module_init);
1920 free_core:
1921 module_free(mod, mod->module_core);
1922 free_percpu:
1923 if (percpu)
1924 percpu_modfree(percpu);
1925 free_mod:
1926 kfree(args);
1927 free_hdr:
1928 vfree(hdr);
1929 return ERR_PTR(err);
1930
1931 truncated:
1932 printk(KERN_ERR "Module len %lu truncated\n", len);
1933 err = -ENOEXEC;
1934 goto free_hdr;
1935 }
1936
1937 /*
1938 * link the module with the whole machine is stopped with interrupts off
1939 * - this defends against kallsyms not taking locks
1940 */
1941 static int __link_module(void *_mod)
1942 {
1943 struct module *mod = _mod;
1944 list_add(&mod->list, &modules);
1945 return 0;
1946 }
1947
1948 /* This is where the real work happens */
1949 asmlinkage long
1950 sys_init_module(void __user *umod,
1951 unsigned long len,
1952 const char __user *uargs)
1953 {
1954 struct module *mod;
1955 int ret = 0;
1956
1957 /* Must have permission */
1958 if (!capable(CAP_SYS_MODULE))
1959 return -EPERM;
1960
1961 /* Only one module load at a time, please */
1962 if (mutex_lock_interruptible(&module_mutex) != 0)
1963 return -EINTR;
1964
1965 /* Do all the hard work */
1966 mod = load_module(umod, len, uargs);
1967 if (IS_ERR(mod)) {
1968 mutex_unlock(&module_mutex);
1969 return PTR_ERR(mod);
1970 }
1971
1972 /* Now sew it into the lists. They won't access us, since
1973 strong_try_module_get() will fail. */
1974 stop_machine_run(__link_module, mod, NR_CPUS);
1975
1976 /* Drop lock so they can recurse */
1977 mutex_unlock(&module_mutex);
1978
1979 blocking_notifier_call_chain(&module_notify_list,
1980 MODULE_STATE_COMING, mod);
1981
1982 /* Start the module */
1983 if (mod->init != NULL)
1984 ret = mod->init();
1985 if (ret < 0) {
1986 /* Init routine failed: abort. Try to protect us from
1987 buggy refcounters. */
1988 mod->state = MODULE_STATE_GOING;
1989 synchronize_sched();
1990 if (mod->unsafe)
1991 printk(KERN_ERR "%s: module is now stuck!\n",
1992 mod->name);
1993 else {
1994 module_put(mod);
1995 mutex_lock(&module_mutex);
1996 free_module(mod);
1997 mutex_unlock(&module_mutex);
1998 }
1999 return ret;
2000 }
2001
2002 /* Now it's a first class citizen! */
2003 mutex_lock(&module_mutex);
2004 mod->state = MODULE_STATE_LIVE;
2005 /* Drop initial reference. */
2006 module_put(mod);
2007 unwind_remove_table(mod->unwind_info, 1);
2008 module_free(mod, mod->module_init);
2009 mod->module_init = NULL;
2010 mod->init_size = 0;
2011 mod->init_text_size = 0;
2012 mutex_unlock(&module_mutex);
2013
2014 return 0;
2015 }
2016
2017 static inline int within(unsigned long addr, void *start, unsigned long size)
2018 {
2019 return ((void *)addr >= start && (void *)addr < start + size);
2020 }
2021
2022 #ifdef CONFIG_KALLSYMS
2023 /*
2024 * This ignores the intensely annoying "mapping symbols" found
2025 * in ARM ELF files: $a, $t and $d.
2026 */
2027 static inline int is_arm_mapping_symbol(const char *str)
2028 {
2029 return str[0] == '$' && strchr("atd", str[1])
2030 && (str[2] == '\0' || str[2] == '.');
2031 }
2032
2033 static const char *get_ksymbol(struct module *mod,
2034 unsigned long addr,
2035 unsigned long *size,
2036 unsigned long *offset)
2037 {
2038 unsigned int i, best = 0;
2039 unsigned long nextval;
2040
2041 /* At worse, next value is at end of module */
2042 if (within(addr, mod->module_init, mod->init_size))
2043 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2044 else
2045 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2046
2047 /* Scan for closest preceeding symbol, and next symbol. (ELF
2048 starts real symbols at 1). */
2049 for (i = 1; i < mod->num_symtab; i++) {
2050 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2051 continue;
2052
2053 /* We ignore unnamed symbols: they're uninformative
2054 * and inserted at a whim. */
2055 if (mod->symtab[i].st_value <= addr
2056 && mod->symtab[i].st_value > mod->symtab[best].st_value
2057 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2058 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2059 best = i;
2060 if (mod->symtab[i].st_value > addr
2061 && mod->symtab[i].st_value < nextval
2062 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2063 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2064 nextval = mod->symtab[i].st_value;
2065 }
2066
2067 if (!best)
2068 return NULL;
2069
2070 *size = nextval - mod->symtab[best].st_value;
2071 *offset = addr - mod->symtab[best].st_value;
2072 return mod->strtab + mod->symtab[best].st_name;
2073 }
2074
2075 /* For kallsyms to ask for address resolution. NULL means not found.
2076 We don't lock, as this is used for oops resolution and races are a
2077 lesser concern. */
2078 const char *module_address_lookup(unsigned long addr,
2079 unsigned long *size,
2080 unsigned long *offset,
2081 char **modname)
2082 {
2083 struct module *mod;
2084
2085 list_for_each_entry(mod, &modules, list) {
2086 if (within(addr, mod->module_init, mod->init_size)
2087 || within(addr, mod->module_core, mod->core_size)) {
2088 if (modname)
2089 *modname = mod->name;
2090 return get_ksymbol(mod, addr, size, offset);
2091 }
2092 }
2093 return NULL;
2094 }
2095
2096 struct module *module_get_kallsym(unsigned int symnum, unsigned long *value,
2097 char *type, char *name, size_t namelen)
2098 {
2099 struct module *mod;
2100
2101 mutex_lock(&module_mutex);
2102 list_for_each_entry(mod, &modules, list) {
2103 if (symnum < mod->num_symtab) {
2104 *value = mod->symtab[symnum].st_value;
2105 *type = mod->symtab[symnum].st_info;
2106 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2107 namelen);
2108 mutex_unlock(&module_mutex);
2109 return mod;
2110 }
2111 symnum -= mod->num_symtab;
2112 }
2113 mutex_unlock(&module_mutex);
2114 return NULL;
2115 }
2116
2117 static unsigned long mod_find_symname(struct module *mod, const char *name)
2118 {
2119 unsigned int i;
2120
2121 for (i = 0; i < mod->num_symtab; i++)
2122 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2123 mod->symtab[i].st_info != 'U')
2124 return mod->symtab[i].st_value;
2125 return 0;
2126 }
2127
2128 /* Look for this name: can be of form module:name. */
2129 unsigned long module_kallsyms_lookup_name(const char *name)
2130 {
2131 struct module *mod;
2132 char *colon;
2133 unsigned long ret = 0;
2134
2135 /* Don't lock: we're in enough trouble already. */
2136 if ((colon = strchr(name, ':')) != NULL) {
2137 *colon = '\0';
2138 if ((mod = find_module(name)) != NULL)
2139 ret = mod_find_symname(mod, colon+1);
2140 *colon = ':';
2141 } else {
2142 list_for_each_entry(mod, &modules, list)
2143 if ((ret = mod_find_symname(mod, name)) != 0)
2144 break;
2145 }
2146 return ret;
2147 }
2148 #endif /* CONFIG_KALLSYMS */
2149
2150 /* Called by the /proc file system to return a list of modules. */
2151 static void *m_start(struct seq_file *m, loff_t *pos)
2152 {
2153 struct list_head *i;
2154 loff_t n = 0;
2155
2156 mutex_lock(&module_mutex);
2157 list_for_each(i, &modules) {
2158 if (n++ == *pos)
2159 break;
2160 }
2161 if (i == &modules)
2162 return NULL;
2163 return i;
2164 }
2165
2166 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2167 {
2168 struct list_head *i = p;
2169 (*pos)++;
2170 if (i->next == &modules)
2171 return NULL;
2172 return i->next;
2173 }
2174
2175 static void m_stop(struct seq_file *m, void *p)
2176 {
2177 mutex_unlock(&module_mutex);
2178 }
2179
2180 static char *taint_flags(unsigned int taints, char *buf)
2181 {
2182 int bx = 0;
2183
2184 if (taints) {
2185 buf[bx++] = '(';
2186 if (taints & TAINT_PROPRIETARY_MODULE)
2187 buf[bx++] = 'P';
2188 if (taints & TAINT_FORCED_MODULE)
2189 buf[bx++] = 'F';
2190 /*
2191 * TAINT_FORCED_RMMOD: could be added.
2192 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2193 * apply to modules.
2194 */
2195 buf[bx++] = ')';
2196 }
2197 buf[bx] = '\0';
2198
2199 return buf;
2200 }
2201
2202 static int m_show(struct seq_file *m, void *p)
2203 {
2204 struct module *mod = list_entry(p, struct module, list);
2205 char buf[8];
2206
2207 seq_printf(m, "%s %lu",
2208 mod->name, mod->init_size + mod->core_size);
2209 print_unload_info(m, mod);
2210
2211 /* Informative for users. */
2212 seq_printf(m, " %s",
2213 mod->state == MODULE_STATE_GOING ? "Unloading":
2214 mod->state == MODULE_STATE_COMING ? "Loading":
2215 "Live");
2216 /* Used by oprofile and other similar tools. */
2217 seq_printf(m, " 0x%p", mod->module_core);
2218
2219 /* Taints info */
2220 if (mod->taints)
2221 seq_printf(m, " %s", taint_flags(mod->taints, buf));
2222
2223 seq_printf(m, "\n");
2224 return 0;
2225 }
2226
2227 /* Format: modulename size refcount deps address
2228
2229 Where refcount is a number or -, and deps is a comma-separated list
2230 of depends or -.
2231 */
2232 const struct seq_operations modules_op = {
2233 .start = m_start,
2234 .next = m_next,
2235 .stop = m_stop,
2236 .show = m_show
2237 };
2238
2239 /* Given an address, look for it in the module exception tables. */
2240 const struct exception_table_entry *search_module_extables(unsigned long addr)
2241 {
2242 unsigned long flags;
2243 const struct exception_table_entry *e = NULL;
2244 struct module *mod;
2245
2246 spin_lock_irqsave(&modlist_lock, flags);
2247 list_for_each_entry(mod, &modules, list) {
2248 if (mod->num_exentries == 0)
2249 continue;
2250
2251 e = search_extable(mod->extable,
2252 mod->extable + mod->num_exentries - 1,
2253 addr);
2254 if (e)
2255 break;
2256 }
2257 spin_unlock_irqrestore(&modlist_lock, flags);
2258
2259 /* Now, if we found one, we are running inside it now, hence
2260 we cannot unload the module, hence no refcnt needed. */
2261 return e;
2262 }
2263
2264 /*
2265 * Is this a valid module address?
2266 */
2267 int is_module_address(unsigned long addr)
2268 {
2269 unsigned long flags;
2270 struct module *mod;
2271
2272 spin_lock_irqsave(&modlist_lock, flags);
2273
2274 list_for_each_entry(mod, &modules, list) {
2275 if (within(addr, mod->module_core, mod->core_size)) {
2276 spin_unlock_irqrestore(&modlist_lock, flags);
2277 return 1;
2278 }
2279 }
2280
2281 spin_unlock_irqrestore(&modlist_lock, flags);
2282
2283 return 0;
2284 }
2285
2286
2287 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2288 struct module *__module_text_address(unsigned long addr)
2289 {
2290 struct module *mod;
2291
2292 list_for_each_entry(mod, &modules, list)
2293 if (within(addr, mod->module_init, mod->init_text_size)
2294 || within(addr, mod->module_core, mod->core_text_size))
2295 return mod;
2296 return NULL;
2297 }
2298
2299 struct module *module_text_address(unsigned long addr)
2300 {
2301 struct module *mod;
2302 unsigned long flags;
2303
2304 spin_lock_irqsave(&modlist_lock, flags);
2305 mod = __module_text_address(addr);
2306 spin_unlock_irqrestore(&modlist_lock, flags);
2307
2308 return mod;
2309 }
2310
2311 /* Don't grab lock, we're oopsing. */
2312 void print_modules(void)
2313 {
2314 struct module *mod;
2315 char buf[8];
2316
2317 printk("Modules linked in:");
2318 list_for_each_entry(mod, &modules, list)
2319 printk(" %s%s", mod->name, taint_flags(mod->taints, buf));
2320 printk("\n");
2321 }
2322
2323 static char *make_driver_name(struct device_driver *drv)
2324 {
2325 char *driver_name;
2326
2327 driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2,
2328 GFP_KERNEL);
2329 if (!driver_name)
2330 return NULL;
2331
2332 sprintf(driver_name, "%s:%s", drv->bus->name, drv->name);
2333 return driver_name;
2334 }
2335
2336 static void module_create_drivers_dir(struct module_kobject *mk)
2337 {
2338 if (!mk || mk->drivers_dir)
2339 return;
2340
2341 mk->drivers_dir = kobject_add_dir(&mk->kobj, "drivers");
2342 }
2343
2344 void module_add_driver(struct module *mod, struct device_driver *drv)
2345 {
2346 char *driver_name;
2347 int no_warn;
2348 struct module_kobject *mk = NULL;
2349
2350 if (!drv)
2351 return;
2352
2353 if (mod)
2354 mk = &mod->mkobj;
2355 else if (drv->mod_name) {
2356 struct kobject *mkobj;
2357
2358 /* Lookup built-in module entry in /sys/modules */
2359 mkobj = kset_find_obj(&module_subsys.kset, drv->mod_name);
2360 if (mkobj)
2361 mk = container_of(mkobj, struct module_kobject, kobj);
2362 }
2363
2364 if (!mk)
2365 return;
2366
2367 /* Don't check return codes; these calls are idempotent */
2368 no_warn = sysfs_create_link(&drv->kobj, &mk->kobj, "module");
2369 driver_name = make_driver_name(drv);
2370 if (driver_name) {
2371 module_create_drivers_dir(mk);
2372 no_warn = sysfs_create_link(mk->drivers_dir, &drv->kobj,
2373 driver_name);
2374 kfree(driver_name);
2375 }
2376 }
2377 EXPORT_SYMBOL(module_add_driver);
2378
2379 void module_remove_driver(struct device_driver *drv)
2380 {
2381 char *driver_name;
2382
2383 if (!drv)
2384 return;
2385
2386 sysfs_remove_link(&drv->kobj, "module");
2387 if (drv->owner && drv->owner->mkobj.drivers_dir) {
2388 driver_name = make_driver_name(drv);
2389 if (driver_name) {
2390 sysfs_remove_link(drv->owner->mkobj.drivers_dir,
2391 driver_name);
2392 kfree(driver_name);
2393 }
2394 }
2395 }
2396 EXPORT_SYMBOL(module_remove_driver);
2397
2398 #ifdef CONFIG_MODVERSIONS
2399 /* Generate the signature for struct module here, too, for modversions. */
2400 void struct_module(struct module *mod) { return; }
2401 EXPORT_SYMBOL(struct_module);
2402 #endif
linux v2.6.22.y-op