Commit | Line | Data |
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1da177e4 LT |
1 | /* Rewritten by Rusty Russell, on the backs of many others... |
2 | Copyright (C) 2002 Richard Henderson | |
3 | Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | #include <linux/config.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/moduleloader.h> | |
22 | #include <linux/init.h> | |
9f158333 | 23 | #include <linux/kernel.h> |
1da177e4 LT |
24 | #include <linux/slab.h> |
25 | #include <linux/vmalloc.h> | |
26 | #include <linux/elf.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/syscalls.h> | |
29 | #include <linux/fcntl.h> | |
30 | #include <linux/rcupdate.h> | |
c59ede7b | 31 | #include <linux/capability.h> |
1da177e4 LT |
32 | #include <linux/cpu.h> |
33 | #include <linux/moduleparam.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/err.h> | |
36 | #include <linux/vermagic.h> | |
37 | #include <linux/notifier.h> | |
38 | #include <linux/stop_machine.h> | |
39 | #include <linux/device.h> | |
c988d2b2 | 40 | #include <linux/string.h> |
8c65b4a6 | 41 | #include <linux/sched.h> |
97d1f15b | 42 | #include <linux/mutex.h> |
1da177e4 LT |
43 | #include <asm/uaccess.h> |
44 | #include <asm/semaphore.h> | |
45 | #include <asm/cacheflush.h> | |
46 | ||
47 | #if 0 | |
48 | #define DEBUGP printk | |
49 | #else | |
50 | #define DEBUGP(fmt , a...) | |
51 | #endif | |
52 | ||
53 | #ifndef ARCH_SHF_SMALL | |
54 | #define ARCH_SHF_SMALL 0 | |
55 | #endif | |
56 | ||
57 | /* If this is set, the section belongs in the init part of the module */ | |
58 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
59 | ||
60 | /* Protects module list */ | |
61 | static DEFINE_SPINLOCK(modlist_lock); | |
62 | ||
63 | /* List of modules, protected by module_mutex AND modlist_lock */ | |
6389a385 | 64 | static DEFINE_MUTEX(module_mutex); |
1da177e4 LT |
65 | static LIST_HEAD(modules); |
66 | ||
e041c683 | 67 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 LT |
68 | |
69 | int register_module_notifier(struct notifier_block * nb) | |
70 | { | |
e041c683 | 71 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
72 | } |
73 | EXPORT_SYMBOL(register_module_notifier); | |
74 | ||
75 | int unregister_module_notifier(struct notifier_block * nb) | |
76 | { | |
e041c683 | 77 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
78 | } |
79 | EXPORT_SYMBOL(unregister_module_notifier); | |
80 | ||
81 | /* We require a truly strong try_module_get() */ | |
82 | static inline int strong_try_module_get(struct module *mod) | |
83 | { | |
84 | if (mod && mod->state == MODULE_STATE_COMING) | |
85 | return 0; | |
86 | return try_module_get(mod); | |
87 | } | |
88 | ||
89 | /* A thread that wants to hold a reference to a module only while it | |
90 | * is running can call ths to safely exit. | |
91 | * nfsd and lockd use this. | |
92 | */ | |
93 | void __module_put_and_exit(struct module *mod, long code) | |
94 | { | |
95 | module_put(mod); | |
96 | do_exit(code); | |
97 | } | |
98 | EXPORT_SYMBOL(__module_put_and_exit); | |
99 | ||
100 | /* Find a module section: 0 means not found. */ | |
101 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
102 | Elf_Shdr *sechdrs, | |
103 | const char *secstrings, | |
104 | const char *name) | |
105 | { | |
106 | unsigned int i; | |
107 | ||
108 | for (i = 1; i < hdr->e_shnum; i++) | |
109 | /* Alloc bit cleared means "ignore it." */ | |
110 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
111 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
112 | return i; | |
113 | return 0; | |
114 | } | |
115 | ||
116 | /* Provided by the linker */ | |
117 | extern const struct kernel_symbol __start___ksymtab[]; | |
118 | extern const struct kernel_symbol __stop___ksymtab[]; | |
119 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
120 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
121 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
122 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
123 | extern const unsigned long __start___kcrctab[]; |
124 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 125 | extern const unsigned long __start___kcrctab_gpl_future[]; |
1da177e4 LT |
126 | |
127 | #ifndef CONFIG_MODVERSIONS | |
128 | #define symversion(base, idx) NULL | |
129 | #else | |
f83ca9fe | 130 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
131 | #endif |
132 | ||
3fd6805f SR |
133 | /* lookup symbol in given range of kernel_symbols */ |
134 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
135 | const struct kernel_symbol *start, | |
136 | const struct kernel_symbol *stop) | |
137 | { | |
138 | const struct kernel_symbol *ks = start; | |
139 | for (; ks < stop; ks++) | |
140 | if (strcmp(ks->name, name) == 0) | |
141 | return ks; | |
142 | return NULL; | |
143 | } | |
144 | ||
1da177e4 LT |
145 | /* Find a symbol, return value, crc and module which owns it */ |
146 | static unsigned long __find_symbol(const char *name, | |
147 | struct module **owner, | |
148 | const unsigned long **crc, | |
149 | int gplok) | |
150 | { | |
151 | struct module *mod; | |
3fd6805f | 152 | const struct kernel_symbol *ks; |
1da177e4 LT |
153 | |
154 | /* Core kernel first. */ | |
155 | *owner = NULL; | |
3fd6805f SR |
156 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
157 | if (ks) { | |
158 | *crc = symversion(__start___kcrctab, (ks - __start___ksymtab)); | |
159 | return ks->value; | |
1da177e4 LT |
160 | } |
161 | if (gplok) { | |
3fd6805f SR |
162 | ks = lookup_symbol(name, __start___ksymtab_gpl, |
163 | __stop___ksymtab_gpl); | |
164 | if (ks) { | |
165 | *crc = symversion(__start___kcrctab_gpl, | |
166 | (ks - __start___ksymtab_gpl)); | |
167 | return ks->value; | |
168 | } | |
1da177e4 | 169 | } |
9f28bb7e GKH |
170 | ks = lookup_symbol(name, __start___ksymtab_gpl_future, |
171 | __stop___ksymtab_gpl_future); | |
172 | if (ks) { | |
173 | if (!gplok) { | |
174 | printk(KERN_WARNING "Symbol %s is being used " | |
175 | "by a non-GPL module, which will not " | |
176 | "be allowed in the future\n", name); | |
177 | printk(KERN_WARNING "Please see the file " | |
178 | "Documentation/feature-removal-schedule.txt " | |
179 | "in the kernel source tree for more " | |
180 | "details.\n"); | |
181 | } | |
182 | *crc = symversion(__start___kcrctab_gpl_future, | |
183 | (ks - __start___ksymtab_gpl_future)); | |
184 | return ks->value; | |
185 | } | |
1da177e4 LT |
186 | |
187 | /* Now try modules. */ | |
188 | list_for_each_entry(mod, &modules, list) { | |
189 | *owner = mod; | |
3fd6805f SR |
190 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
191 | if (ks) { | |
192 | *crc = symversion(mod->crcs, (ks - mod->syms)); | |
193 | return ks->value; | |
194 | } | |
1da177e4 LT |
195 | |
196 | if (gplok) { | |
3fd6805f SR |
197 | ks = lookup_symbol(name, mod->gpl_syms, |
198 | mod->gpl_syms + mod->num_gpl_syms); | |
199 | if (ks) { | |
200 | *crc = symversion(mod->gpl_crcs, | |
201 | (ks - mod->gpl_syms)); | |
202 | return ks->value; | |
1da177e4 LT |
203 | } |
204 | } | |
9f28bb7e GKH |
205 | ks = lookup_symbol(name, mod->gpl_future_syms, |
206 | (mod->gpl_future_syms + | |
207 | mod->num_gpl_future_syms)); | |
208 | if (ks) { | |
209 | if (!gplok) { | |
210 | printk(KERN_WARNING "Symbol %s is being used " | |
211 | "by a non-GPL module, which will not " | |
212 | "be allowed in the future\n", name); | |
213 | printk(KERN_WARNING "Please see the file " | |
214 | "Documentation/feature-removal-schedule.txt " | |
215 | "in the kernel source tree for more " | |
216 | "details.\n"); | |
217 | } | |
218 | *crc = symversion(mod->gpl_future_crcs, | |
219 | (ks - mod->gpl_future_syms)); | |
220 | return ks->value; | |
221 | } | |
1da177e4 LT |
222 | } |
223 | DEBUGP("Failed to find symbol %s\n", name); | |
224 | return 0; | |
225 | } | |
226 | ||
1da177e4 LT |
227 | /* Search for module by name: must hold module_mutex. */ |
228 | static struct module *find_module(const char *name) | |
229 | { | |
230 | struct module *mod; | |
231 | ||
232 | list_for_each_entry(mod, &modules, list) { | |
233 | if (strcmp(mod->name, name) == 0) | |
234 | return mod; | |
235 | } | |
236 | return NULL; | |
237 | } | |
238 | ||
239 | #ifdef CONFIG_SMP | |
240 | /* Number of blocks used and allocated. */ | |
241 | static unsigned int pcpu_num_used, pcpu_num_allocated; | |
242 | /* Size of each block. -ve means used. */ | |
243 | static int *pcpu_size; | |
244 | ||
245 | static int split_block(unsigned int i, unsigned short size) | |
246 | { | |
247 | /* Reallocation required? */ | |
248 | if (pcpu_num_used + 1 > pcpu_num_allocated) { | |
249 | int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2, | |
250 | GFP_KERNEL); | |
251 | if (!new) | |
252 | return 0; | |
253 | ||
254 | memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated); | |
255 | pcpu_num_allocated *= 2; | |
256 | kfree(pcpu_size); | |
257 | pcpu_size = new; | |
258 | } | |
259 | ||
260 | /* Insert a new subblock */ | |
261 | memmove(&pcpu_size[i+1], &pcpu_size[i], | |
262 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); | |
263 | pcpu_num_used++; | |
264 | ||
265 | pcpu_size[i+1] -= size; | |
266 | pcpu_size[i] = size; | |
267 | return 1; | |
268 | } | |
269 | ||
270 | static inline unsigned int block_size(int val) | |
271 | { | |
272 | if (val < 0) | |
273 | return -val; | |
274 | return val; | |
275 | } | |
276 | ||
277 | /* Created by linker magic */ | |
278 | extern char __per_cpu_start[], __per_cpu_end[]; | |
279 | ||
842bbaaa RR |
280 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
281 | const char *name) | |
1da177e4 LT |
282 | { |
283 | unsigned long extra; | |
284 | unsigned int i; | |
285 | void *ptr; | |
286 | ||
842bbaaa RR |
287 | if (align > SMP_CACHE_BYTES) { |
288 | printk(KERN_WARNING "%s: per-cpu alignment %li > %i\n", | |
289 | name, align, SMP_CACHE_BYTES); | |
290 | align = SMP_CACHE_BYTES; | |
291 | } | |
1da177e4 LT |
292 | |
293 | ptr = __per_cpu_start; | |
294 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
295 | /* Extra for alignment requirement. */ | |
296 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; | |
297 | BUG_ON(i == 0 && extra != 0); | |
298 | ||
299 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) | |
300 | continue; | |
301 | ||
302 | /* Transfer extra to previous block. */ | |
303 | if (pcpu_size[i-1] < 0) | |
304 | pcpu_size[i-1] -= extra; | |
305 | else | |
306 | pcpu_size[i-1] += extra; | |
307 | pcpu_size[i] -= extra; | |
308 | ptr += extra; | |
309 | ||
310 | /* Split block if warranted */ | |
311 | if (pcpu_size[i] - size > sizeof(unsigned long)) | |
312 | if (!split_block(i, size)) | |
313 | return NULL; | |
314 | ||
315 | /* Mark allocated */ | |
316 | pcpu_size[i] = -pcpu_size[i]; | |
317 | return ptr; | |
318 | } | |
319 | ||
320 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", | |
321 | size); | |
322 | return NULL; | |
323 | } | |
324 | ||
325 | static void percpu_modfree(void *freeme) | |
326 | { | |
327 | unsigned int i; | |
328 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); | |
329 | ||
330 | /* First entry is core kernel percpu data. */ | |
331 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
332 | if (ptr == freeme) { | |
333 | pcpu_size[i] = -pcpu_size[i]; | |
334 | goto free; | |
335 | } | |
336 | } | |
337 | BUG(); | |
338 | ||
339 | free: | |
340 | /* Merge with previous? */ | |
341 | if (pcpu_size[i-1] >= 0) { | |
342 | pcpu_size[i-1] += pcpu_size[i]; | |
343 | pcpu_num_used--; | |
344 | memmove(&pcpu_size[i], &pcpu_size[i+1], | |
345 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); | |
346 | i--; | |
347 | } | |
348 | /* Merge with next? */ | |
349 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { | |
350 | pcpu_size[i] += pcpu_size[i+1]; | |
351 | pcpu_num_used--; | |
352 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], | |
353 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); | |
354 | } | |
355 | } | |
356 | ||
357 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
358 | Elf_Shdr *sechdrs, | |
359 | const char *secstrings) | |
360 | { | |
361 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); | |
362 | } | |
363 | ||
364 | static int percpu_modinit(void) | |
365 | { | |
366 | pcpu_num_used = 2; | |
367 | pcpu_num_allocated = 2; | |
368 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, | |
369 | GFP_KERNEL); | |
370 | /* Static in-kernel percpu data (used). */ | |
371 | pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES); | |
372 | /* Free room. */ | |
373 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; | |
374 | if (pcpu_size[1] < 0) { | |
375 | printk(KERN_ERR "No per-cpu room for modules.\n"); | |
376 | pcpu_num_used = 1; | |
377 | } | |
378 | ||
379 | return 0; | |
380 | } | |
381 | __initcall(percpu_modinit); | |
382 | #else /* ... !CONFIG_SMP */ | |
842bbaaa RR |
383 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
384 | const char *name) | |
1da177e4 LT |
385 | { |
386 | return NULL; | |
387 | } | |
388 | static inline void percpu_modfree(void *pcpuptr) | |
389 | { | |
390 | BUG(); | |
391 | } | |
392 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
393 | Elf_Shdr *sechdrs, | |
394 | const char *secstrings) | |
395 | { | |
396 | return 0; | |
397 | } | |
398 | static inline void percpu_modcopy(void *pcpudst, const void *src, | |
399 | unsigned long size) | |
400 | { | |
401 | /* pcpusec should be 0, and size of that section should be 0. */ | |
402 | BUG_ON(size != 0); | |
403 | } | |
404 | #endif /* CONFIG_SMP */ | |
405 | ||
c988d2b2 MD |
406 | #define MODINFO_ATTR(field) \ |
407 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
408 | { \ | |
409 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
410 | } \ | |
411 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
412 | struct module *mod, char *buffer) \ | |
413 | { \ | |
414 | return sprintf(buffer, "%s\n", mod->field); \ | |
415 | } \ | |
416 | static int modinfo_##field##_exists(struct module *mod) \ | |
417 | { \ | |
418 | return mod->field != NULL; \ | |
419 | } \ | |
420 | static void free_modinfo_##field(struct module *mod) \ | |
421 | { \ | |
422 | kfree(mod->field); \ | |
423 | mod->field = NULL; \ | |
424 | } \ | |
425 | static struct module_attribute modinfo_##field = { \ | |
426 | .attr = { .name = __stringify(field), .mode = 0444, \ | |
427 | .owner = THIS_MODULE }, \ | |
428 | .show = show_modinfo_##field, \ | |
429 | .setup = setup_modinfo_##field, \ | |
430 | .test = modinfo_##field##_exists, \ | |
431 | .free = free_modinfo_##field, \ | |
432 | }; | |
433 | ||
434 | MODINFO_ATTR(version); | |
435 | MODINFO_ATTR(srcversion); | |
436 | ||
03e88ae1 | 437 | #ifdef CONFIG_MODULE_UNLOAD |
1da177e4 LT |
438 | /* Init the unload section of the module. */ |
439 | static void module_unload_init(struct module *mod) | |
440 | { | |
441 | unsigned int i; | |
442 | ||
443 | INIT_LIST_HEAD(&mod->modules_which_use_me); | |
444 | for (i = 0; i < NR_CPUS; i++) | |
445 | local_set(&mod->ref[i].count, 0); | |
446 | /* Hold reference count during initialization. */ | |
39c715b7 | 447 | local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
1da177e4 LT |
448 | /* Backwards compatibility macros put refcount during init. */ |
449 | mod->waiter = current; | |
450 | } | |
451 | ||
452 | /* modules using other modules */ | |
453 | struct module_use | |
454 | { | |
455 | struct list_head list; | |
456 | struct module *module_which_uses; | |
457 | }; | |
458 | ||
459 | /* Does a already use b? */ | |
460 | static int already_uses(struct module *a, struct module *b) | |
461 | { | |
462 | struct module_use *use; | |
463 | ||
464 | list_for_each_entry(use, &b->modules_which_use_me, list) { | |
465 | if (use->module_which_uses == a) { | |
466 | DEBUGP("%s uses %s!\n", a->name, b->name); | |
467 | return 1; | |
468 | } | |
469 | } | |
470 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | /* Module a uses b */ | |
475 | static int use_module(struct module *a, struct module *b) | |
476 | { | |
477 | struct module_use *use; | |
478 | if (b == NULL || already_uses(a, b)) return 1; | |
479 | ||
480 | if (!strong_try_module_get(b)) | |
481 | return 0; | |
482 | ||
483 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
484 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
485 | if (!use) { | |
486 | printk("%s: out of memory loading\n", a->name); | |
487 | module_put(b); | |
488 | return 0; | |
489 | } | |
490 | ||
491 | use->module_which_uses = a; | |
492 | list_add(&use->list, &b->modules_which_use_me); | |
493 | return 1; | |
494 | } | |
495 | ||
496 | /* Clear the unload stuff of the module. */ | |
497 | static void module_unload_free(struct module *mod) | |
498 | { | |
499 | struct module *i; | |
500 | ||
501 | list_for_each_entry(i, &modules, list) { | |
502 | struct module_use *use; | |
503 | ||
504 | list_for_each_entry(use, &i->modules_which_use_me, list) { | |
505 | if (use->module_which_uses == mod) { | |
506 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
507 | module_put(i); | |
508 | list_del(&use->list); | |
509 | kfree(use); | |
510 | /* There can be at most one match. */ | |
511 | break; | |
512 | } | |
513 | } | |
514 | } | |
515 | } | |
516 | ||
517 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 518 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
519 | { |
520 | int ret = (flags & O_TRUNC); | |
521 | if (ret) | |
fb169793 | 522 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
523 | return ret; |
524 | } | |
525 | #else | |
fb169793 | 526 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
527 | { |
528 | return 0; | |
529 | } | |
530 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
531 | ||
532 | struct stopref | |
533 | { | |
534 | struct module *mod; | |
535 | int flags; | |
536 | int *forced; | |
537 | }; | |
538 | ||
539 | /* Whole machine is stopped with interrupts off when this runs. */ | |
540 | static int __try_stop_module(void *_sref) | |
541 | { | |
542 | struct stopref *sref = _sref; | |
543 | ||
544 | /* If it's not unused, quit unless we are told to block. */ | |
545 | if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) { | |
fb169793 | 546 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
547 | return -EWOULDBLOCK; |
548 | } | |
549 | ||
550 | /* Mark it as dying. */ | |
551 | sref->mod->state = MODULE_STATE_GOING; | |
552 | return 0; | |
553 | } | |
554 | ||
555 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
556 | { | |
557 | struct stopref sref = { mod, flags, forced }; | |
558 | ||
559 | return stop_machine_run(__try_stop_module, &sref, NR_CPUS); | |
560 | } | |
561 | ||
562 | unsigned int module_refcount(struct module *mod) | |
563 | { | |
564 | unsigned int i, total = 0; | |
565 | ||
566 | for (i = 0; i < NR_CPUS; i++) | |
567 | total += local_read(&mod->ref[i].count); | |
568 | return total; | |
569 | } | |
570 | EXPORT_SYMBOL(module_refcount); | |
571 | ||
572 | /* This exists whether we can unload or not */ | |
573 | static void free_module(struct module *mod); | |
574 | ||
575 | static void wait_for_zero_refcount(struct module *mod) | |
576 | { | |
577 | /* Since we might sleep for some time, drop the semaphore first */ | |
6389a385 | 578 | mutex_unlock(&module_mutex); |
1da177e4 LT |
579 | for (;;) { |
580 | DEBUGP("Looking at refcount...\n"); | |
581 | set_current_state(TASK_UNINTERRUPTIBLE); | |
582 | if (module_refcount(mod) == 0) | |
583 | break; | |
584 | schedule(); | |
585 | } | |
586 | current->state = TASK_RUNNING; | |
6389a385 | 587 | mutex_lock(&module_mutex); |
1da177e4 LT |
588 | } |
589 | ||
590 | asmlinkage long | |
591 | sys_delete_module(const char __user *name_user, unsigned int flags) | |
592 | { | |
593 | struct module *mod; | |
594 | char name[MODULE_NAME_LEN]; | |
595 | int ret, forced = 0; | |
596 | ||
597 | if (!capable(CAP_SYS_MODULE)) | |
598 | return -EPERM; | |
599 | ||
600 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
601 | return -EFAULT; | |
602 | name[MODULE_NAME_LEN-1] = '\0'; | |
603 | ||
6389a385 | 604 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
605 | return -EINTR; |
606 | ||
607 | mod = find_module(name); | |
608 | if (!mod) { | |
609 | ret = -ENOENT; | |
610 | goto out; | |
611 | } | |
612 | ||
613 | if (!list_empty(&mod->modules_which_use_me)) { | |
614 | /* Other modules depend on us: get rid of them first. */ | |
615 | ret = -EWOULDBLOCK; | |
616 | goto out; | |
617 | } | |
618 | ||
619 | /* Doing init or already dying? */ | |
620 | if (mod->state != MODULE_STATE_LIVE) { | |
621 | /* FIXME: if (force), slam module count and wake up | |
622 | waiter --RR */ | |
623 | DEBUGP("%s already dying\n", mod->name); | |
624 | ret = -EBUSY; | |
625 | goto out; | |
626 | } | |
627 | ||
628 | /* If it has an init func, it must have an exit func to unload */ | |
629 | if ((mod->init != NULL && mod->exit == NULL) | |
630 | || mod->unsafe) { | |
fb169793 | 631 | forced = try_force_unload(flags); |
1da177e4 LT |
632 | if (!forced) { |
633 | /* This module can't be removed */ | |
634 | ret = -EBUSY; | |
635 | goto out; | |
636 | } | |
637 | } | |
638 | ||
639 | /* Set this up before setting mod->state */ | |
640 | mod->waiter = current; | |
641 | ||
642 | /* Stop the machine so refcounts can't move and disable module. */ | |
643 | ret = try_stop_module(mod, flags, &forced); | |
644 | if (ret != 0) | |
645 | goto out; | |
646 | ||
647 | /* Never wait if forced. */ | |
648 | if (!forced && module_refcount(mod) != 0) | |
649 | wait_for_zero_refcount(mod); | |
650 | ||
651 | /* Final destruction now noone is using it. */ | |
652 | if (mod->exit != NULL) { | |
6389a385 | 653 | mutex_unlock(&module_mutex); |
1da177e4 | 654 | mod->exit(); |
6389a385 | 655 | mutex_lock(&module_mutex); |
1da177e4 LT |
656 | } |
657 | free_module(mod); | |
658 | ||
659 | out: | |
6389a385 | 660 | mutex_unlock(&module_mutex); |
1da177e4 LT |
661 | return ret; |
662 | } | |
663 | ||
664 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
665 | { | |
666 | struct module_use *use; | |
667 | int printed_something = 0; | |
668 | ||
669 | seq_printf(m, " %u ", module_refcount(mod)); | |
670 | ||
671 | /* Always include a trailing , so userspace can differentiate | |
672 | between this and the old multi-field proc format. */ | |
673 | list_for_each_entry(use, &mod->modules_which_use_me, list) { | |
674 | printed_something = 1; | |
675 | seq_printf(m, "%s,", use->module_which_uses->name); | |
676 | } | |
677 | ||
678 | if (mod->unsafe) { | |
679 | printed_something = 1; | |
680 | seq_printf(m, "[unsafe],"); | |
681 | } | |
682 | ||
683 | if (mod->init != NULL && mod->exit == NULL) { | |
684 | printed_something = 1; | |
685 | seq_printf(m, "[permanent],"); | |
686 | } | |
687 | ||
688 | if (!printed_something) | |
689 | seq_printf(m, "-"); | |
690 | } | |
691 | ||
692 | void __symbol_put(const char *symbol) | |
693 | { | |
694 | struct module *owner; | |
695 | unsigned long flags; | |
696 | const unsigned long *crc; | |
697 | ||
698 | spin_lock_irqsave(&modlist_lock, flags); | |
699 | if (!__find_symbol(symbol, &owner, &crc, 1)) | |
700 | BUG(); | |
701 | module_put(owner); | |
702 | spin_unlock_irqrestore(&modlist_lock, flags); | |
703 | } | |
704 | EXPORT_SYMBOL(__symbol_put); | |
705 | ||
706 | void symbol_put_addr(void *addr) | |
707 | { | |
708 | unsigned long flags; | |
709 | ||
710 | spin_lock_irqsave(&modlist_lock, flags); | |
711 | if (!kernel_text_address((unsigned long)addr)) | |
712 | BUG(); | |
713 | ||
714 | module_put(module_text_address((unsigned long)addr)); | |
715 | spin_unlock_irqrestore(&modlist_lock, flags); | |
716 | } | |
717 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
718 | ||
719 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
720 | struct module *mod, char *buffer) | |
721 | { | |
722 | /* sysfs holds a reference */ | |
723 | return sprintf(buffer, "%u\n", module_refcount(mod)-1); | |
724 | } | |
725 | ||
726 | static struct module_attribute refcnt = { | |
727 | .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE }, | |
728 | .show = show_refcnt, | |
729 | }; | |
730 | ||
731 | #else /* !CONFIG_MODULE_UNLOAD */ | |
732 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
733 | { | |
734 | /* We don't know the usage count, or what modules are using. */ | |
735 | seq_printf(m, " - -"); | |
736 | } | |
737 | ||
738 | static inline void module_unload_free(struct module *mod) | |
739 | { | |
740 | } | |
741 | ||
742 | static inline int use_module(struct module *a, struct module *b) | |
743 | { | |
744 | return strong_try_module_get(b); | |
745 | } | |
746 | ||
747 | static inline void module_unload_init(struct module *mod) | |
748 | { | |
749 | } | |
750 | #endif /* CONFIG_MODULE_UNLOAD */ | |
751 | ||
03e88ae1 GKH |
752 | static struct module_attribute *modinfo_attrs[] = { |
753 | &modinfo_version, | |
754 | &modinfo_srcversion, | |
755 | #ifdef CONFIG_MODULE_UNLOAD | |
756 | &refcnt, | |
757 | #endif | |
758 | NULL, | |
759 | }; | |
760 | ||
1da177e4 LT |
761 | static const char vermagic[] = VERMAGIC_STRING; |
762 | ||
763 | #ifdef CONFIG_MODVERSIONS | |
764 | static int check_version(Elf_Shdr *sechdrs, | |
765 | unsigned int versindex, | |
766 | const char *symname, | |
767 | struct module *mod, | |
768 | const unsigned long *crc) | |
769 | { | |
770 | unsigned int i, num_versions; | |
771 | struct modversion_info *versions; | |
772 | ||
773 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
774 | if (!crc) | |
775 | return 1; | |
776 | ||
777 | versions = (void *) sechdrs[versindex].sh_addr; | |
778 | num_versions = sechdrs[versindex].sh_size | |
779 | / sizeof(struct modversion_info); | |
780 | ||
781 | for (i = 0; i < num_versions; i++) { | |
782 | if (strcmp(versions[i].name, symname) != 0) | |
783 | continue; | |
784 | ||
785 | if (versions[i].crc == *crc) | |
786 | return 1; | |
787 | printk("%s: disagrees about version of symbol %s\n", | |
788 | mod->name, symname); | |
789 | DEBUGP("Found checksum %lX vs module %lX\n", | |
790 | *crc, versions[i].crc); | |
791 | return 0; | |
792 | } | |
793 | /* Not in module's version table. OK, but that taints the kernel. */ | |
794 | if (!(tainted & TAINT_FORCED_MODULE)) { | |
795 | printk("%s: no version for \"%s\" found: kernel tainted.\n", | |
796 | mod->name, symname); | |
9f158333 | 797 | add_taint(TAINT_FORCED_MODULE); |
1da177e4 LT |
798 | } |
799 | return 1; | |
800 | } | |
801 | ||
802 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
803 | unsigned int versindex, | |
804 | struct module *mod) | |
805 | { | |
806 | const unsigned long *crc; | |
807 | struct module *owner; | |
808 | ||
809 | if (!__find_symbol("struct_module", &owner, &crc, 1)) | |
810 | BUG(); | |
811 | return check_version(sechdrs, versindex, "struct_module", mod, | |
812 | crc); | |
813 | } | |
814 | ||
815 | /* First part is kernel version, which we ignore. */ | |
816 | static inline int same_magic(const char *amagic, const char *bmagic) | |
817 | { | |
818 | amagic += strcspn(amagic, " "); | |
819 | bmagic += strcspn(bmagic, " "); | |
820 | return strcmp(amagic, bmagic) == 0; | |
821 | } | |
822 | #else | |
823 | static inline int check_version(Elf_Shdr *sechdrs, | |
824 | unsigned int versindex, | |
825 | const char *symname, | |
826 | struct module *mod, | |
827 | const unsigned long *crc) | |
828 | { | |
829 | return 1; | |
830 | } | |
831 | ||
832 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
833 | unsigned int versindex, | |
834 | struct module *mod) | |
835 | { | |
836 | return 1; | |
837 | } | |
838 | ||
839 | static inline int same_magic(const char *amagic, const char *bmagic) | |
840 | { | |
841 | return strcmp(amagic, bmagic) == 0; | |
842 | } | |
843 | #endif /* CONFIG_MODVERSIONS */ | |
844 | ||
845 | /* Resolve a symbol for this module. I.e. if we find one, record usage. | |
846 | Must be holding module_mutex. */ | |
847 | static unsigned long resolve_symbol(Elf_Shdr *sechdrs, | |
848 | unsigned int versindex, | |
849 | const char *name, | |
850 | struct module *mod) | |
851 | { | |
852 | struct module *owner; | |
853 | unsigned long ret; | |
854 | const unsigned long *crc; | |
855 | ||
1da177e4 LT |
856 | ret = __find_symbol(name, &owner, &crc, mod->license_gplok); |
857 | if (ret) { | |
858 | /* use_module can fail due to OOM, or module unloading */ | |
859 | if (!check_version(sechdrs, versindex, name, mod, crc) || | |
860 | !use_module(mod, owner)) | |
861 | ret = 0; | |
862 | } | |
1da177e4 LT |
863 | return ret; |
864 | } | |
865 | ||
866 | ||
867 | /* | |
868 | * /sys/module/foo/sections stuff | |
869 | * J. Corbet <corbet@lwn.net> | |
870 | */ | |
871 | #ifdef CONFIG_KALLSYMS | |
872 | static ssize_t module_sect_show(struct module_attribute *mattr, | |
873 | struct module *mod, char *buf) | |
874 | { | |
875 | struct module_sect_attr *sattr = | |
876 | container_of(mattr, struct module_sect_attr, mattr); | |
877 | return sprintf(buf, "0x%lx\n", sattr->address); | |
878 | } | |
879 | ||
880 | static void add_sect_attrs(struct module *mod, unsigned int nsect, | |
881 | char *secstrings, Elf_Shdr *sechdrs) | |
882 | { | |
883 | unsigned int nloaded = 0, i, size[2]; | |
884 | struct module_sect_attrs *sect_attrs; | |
885 | struct module_sect_attr *sattr; | |
886 | struct attribute **gattr; | |
887 | ||
888 | /* Count loaded sections and allocate structures */ | |
889 | for (i = 0; i < nsect; i++) | |
890 | if (sechdrs[i].sh_flags & SHF_ALLOC) | |
891 | nloaded++; | |
892 | size[0] = ALIGN(sizeof(*sect_attrs) | |
893 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
894 | sizeof(sect_attrs->grp.attrs[0])); | |
895 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
896 | if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL))) | |
897 | return; | |
898 | ||
899 | /* Setup section attributes. */ | |
900 | sect_attrs->grp.name = "sections"; | |
901 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
902 | ||
903 | sattr = §_attrs->attrs[0]; | |
904 | gattr = §_attrs->grp.attrs[0]; | |
905 | for (i = 0; i < nsect; i++) { | |
906 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) | |
907 | continue; | |
908 | sattr->address = sechdrs[i].sh_addr; | |
909 | strlcpy(sattr->name, secstrings + sechdrs[i].sh_name, | |
910 | MODULE_SECT_NAME_LEN); | |
911 | sattr->mattr.show = module_sect_show; | |
912 | sattr->mattr.store = NULL; | |
913 | sattr->mattr.attr.name = sattr->name; | |
914 | sattr->mattr.attr.owner = mod; | |
915 | sattr->mattr.attr.mode = S_IRUGO; | |
916 | *(gattr++) = &(sattr++)->mattr.attr; | |
917 | } | |
918 | *gattr = NULL; | |
919 | ||
920 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
921 | goto out; | |
922 | ||
923 | mod->sect_attrs = sect_attrs; | |
924 | return; | |
925 | out: | |
926 | kfree(sect_attrs); | |
927 | } | |
928 | ||
929 | static void remove_sect_attrs(struct module *mod) | |
930 | { | |
931 | if (mod->sect_attrs) { | |
932 | sysfs_remove_group(&mod->mkobj.kobj, | |
933 | &mod->sect_attrs->grp); | |
934 | /* We are positive that no one is using any sect attrs | |
935 | * at this point. Deallocate immediately. */ | |
936 | kfree(mod->sect_attrs); | |
937 | mod->sect_attrs = NULL; | |
938 | } | |
939 | } | |
940 | ||
941 | ||
942 | #else | |
943 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, | |
944 | char *sectstrings, Elf_Shdr *sechdrs) | |
945 | { | |
946 | } | |
947 | ||
948 | static inline void remove_sect_attrs(struct module *mod) | |
949 | { | |
950 | } | |
951 | #endif /* CONFIG_KALLSYMS */ | |
952 | ||
c988d2b2 MD |
953 | static int module_add_modinfo_attrs(struct module *mod) |
954 | { | |
955 | struct module_attribute *attr; | |
03e88ae1 | 956 | struct module_attribute *temp_attr; |
c988d2b2 MD |
957 | int error = 0; |
958 | int i; | |
959 | ||
03e88ae1 GKH |
960 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
961 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
962 | GFP_KERNEL); | |
963 | if (!mod->modinfo_attrs) | |
964 | return -ENOMEM; | |
965 | ||
966 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
967 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
968 | if (!attr->test || | |
03e88ae1 GKH |
969 | (attr->test && attr->test(mod))) { |
970 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
971 | temp_attr->attr.owner = mod; | |
972 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); | |
973 | ++temp_attr; | |
974 | } | |
c988d2b2 MD |
975 | } |
976 | return error; | |
977 | } | |
978 | ||
979 | static void module_remove_modinfo_attrs(struct module *mod) | |
980 | { | |
981 | struct module_attribute *attr; | |
982 | int i; | |
983 | ||
03e88ae1 GKH |
984 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
985 | /* pick a field to test for end of list */ | |
986 | if (!attr->attr.name) | |
987 | break; | |
c988d2b2 | 988 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
989 | if (attr->free) |
990 | attr->free(mod); | |
c988d2b2 | 991 | } |
03e88ae1 | 992 | kfree(mod->modinfo_attrs); |
c988d2b2 | 993 | } |
1da177e4 LT |
994 | |
995 | static int mod_sysfs_setup(struct module *mod, | |
996 | struct kernel_param *kparam, | |
997 | unsigned int num_params) | |
998 | { | |
999 | int err; | |
1000 | ||
1001 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); | |
1002 | err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name); | |
1003 | if (err) | |
1004 | goto out; | |
1005 | kobj_set_kset_s(&mod->mkobj, module_subsys); | |
1006 | mod->mkobj.mod = mod; | |
1007 | err = kobject_register(&mod->mkobj.kobj); | |
1008 | if (err) | |
1009 | goto out; | |
1010 | ||
1da177e4 LT |
1011 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1012 | if (err) | |
1013 | goto out_unreg; | |
1014 | ||
c988d2b2 MD |
1015 | err = module_add_modinfo_attrs(mod); |
1016 | if (err) | |
1017 | goto out_unreg; | |
c988d2b2 | 1018 | |
1da177e4 LT |
1019 | return 0; |
1020 | ||
1021 | out_unreg: | |
1022 | kobject_unregister(&mod->mkobj.kobj); | |
1023 | out: | |
1024 | return err; | |
1025 | } | |
1026 | ||
1027 | static void mod_kobject_remove(struct module *mod) | |
1028 | { | |
c988d2b2 | 1029 | module_remove_modinfo_attrs(mod); |
1da177e4 LT |
1030 | module_param_sysfs_remove(mod); |
1031 | ||
1032 | kobject_unregister(&mod->mkobj.kobj); | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * unlink the module with the whole machine is stopped with interrupts off | |
1037 | * - this defends against kallsyms not taking locks | |
1038 | */ | |
1039 | static int __unlink_module(void *_mod) | |
1040 | { | |
1041 | struct module *mod = _mod; | |
1042 | list_del(&mod->list); | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | /* Free a module, remove from lists, etc (must hold module mutex). */ | |
1047 | static void free_module(struct module *mod) | |
1048 | { | |
1049 | /* Delete from various lists */ | |
1050 | stop_machine_run(__unlink_module, mod, NR_CPUS); | |
1051 | remove_sect_attrs(mod); | |
1052 | mod_kobject_remove(mod); | |
1053 | ||
1054 | /* Arch-specific cleanup. */ | |
1055 | module_arch_cleanup(mod); | |
1056 | ||
1057 | /* Module unload stuff */ | |
1058 | module_unload_free(mod); | |
1059 | ||
1060 | /* This may be NULL, but that's OK */ | |
1061 | module_free(mod, mod->module_init); | |
1062 | kfree(mod->args); | |
1063 | if (mod->percpu) | |
1064 | percpu_modfree(mod->percpu); | |
1065 | ||
1066 | /* Finally, free the core (containing the module structure) */ | |
1067 | module_free(mod, mod->module_core); | |
1068 | } | |
1069 | ||
1070 | void *__symbol_get(const char *symbol) | |
1071 | { | |
1072 | struct module *owner; | |
1073 | unsigned long value, flags; | |
1074 | const unsigned long *crc; | |
1075 | ||
1076 | spin_lock_irqsave(&modlist_lock, flags); | |
1077 | value = __find_symbol(symbol, &owner, &crc, 1); | |
1078 | if (value && !strong_try_module_get(owner)) | |
1079 | value = 0; | |
1080 | spin_unlock_irqrestore(&modlist_lock, flags); | |
1081 | ||
1082 | return (void *)value; | |
1083 | } | |
1084 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1085 | ||
eea8b54d AN |
1086 | /* |
1087 | * Ensure that an exported symbol [global namespace] does not already exist | |
1088 | * in the Kernel or in some other modules exported symbol table. | |
1089 | */ | |
1090 | static int verify_export_symbols(struct module *mod) | |
1091 | { | |
1092 | const char *name = NULL; | |
1093 | unsigned long i, ret = 0; | |
1094 | struct module *owner; | |
1095 | const unsigned long *crc; | |
1096 | ||
1097 | for (i = 0; i < mod->num_syms; i++) | |
1098 | if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) { | |
1099 | name = mod->syms[i].name; | |
1100 | ret = -ENOEXEC; | |
1101 | goto dup; | |
1102 | } | |
1103 | ||
1104 | for (i = 0; i < mod->num_gpl_syms; i++) | |
1105 | if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) { | |
1106 | name = mod->gpl_syms[i].name; | |
1107 | ret = -ENOEXEC; | |
1108 | goto dup; | |
1109 | } | |
1110 | ||
1111 | dup: | |
1112 | if (ret) | |
1113 | printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n", | |
1114 | mod->name, name, module_name(owner)); | |
1115 | ||
1116 | return ret; | |
1117 | } | |
1118 | ||
1da177e4 LT |
1119 | /* Change all symbols so that sh_value encodes the pointer directly. */ |
1120 | static int simplify_symbols(Elf_Shdr *sechdrs, | |
1121 | unsigned int symindex, | |
1122 | const char *strtab, | |
1123 | unsigned int versindex, | |
1124 | unsigned int pcpuindex, | |
1125 | struct module *mod) | |
1126 | { | |
1127 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1128 | unsigned long secbase; | |
1129 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1130 | int ret = 0; | |
1131 | ||
1132 | for (i = 1; i < n; i++) { | |
1133 | switch (sym[i].st_shndx) { | |
1134 | case SHN_COMMON: | |
1135 | /* We compiled with -fno-common. These are not | |
1136 | supposed to happen. */ | |
1137 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1138 | printk("%s: please compile with -fno-common\n", | |
1139 | mod->name); | |
1140 | ret = -ENOEXEC; | |
1141 | break; | |
1142 | ||
1143 | case SHN_ABS: | |
1144 | /* Don't need to do anything */ | |
1145 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1146 | (long)sym[i].st_value); | |
1147 | break; | |
1148 | ||
1149 | case SHN_UNDEF: | |
1150 | sym[i].st_value | |
1151 | = resolve_symbol(sechdrs, versindex, | |
1152 | strtab + sym[i].st_name, mod); | |
1153 | ||
1154 | /* Ok if resolved. */ | |
1155 | if (sym[i].st_value != 0) | |
1156 | break; | |
1157 | /* Ok if weak. */ | |
1158 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) | |
1159 | break; | |
1160 | ||
1161 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
1162 | mod->name, strtab + sym[i].st_name); | |
1163 | ret = -ENOENT; | |
1164 | break; | |
1165 | ||
1166 | default: | |
1167 | /* Divert to percpu allocation if a percpu var. */ | |
1168 | if (sym[i].st_shndx == pcpuindex) | |
1169 | secbase = (unsigned long)mod->percpu; | |
1170 | else | |
1171 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1172 | sym[i].st_value += secbase; | |
1173 | break; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | return ret; | |
1178 | } | |
1179 | ||
1180 | /* Update size with this section: return offset. */ | |
1181 | static long get_offset(unsigned long *size, Elf_Shdr *sechdr) | |
1182 | { | |
1183 | long ret; | |
1184 | ||
1185 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); | |
1186 | *size = ret + sechdr->sh_size; | |
1187 | return ret; | |
1188 | } | |
1189 | ||
1190 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1191 | might -- code, read-only data, read-write data, small data. Tally | |
1192 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1193 | belongs in init. */ | |
1194 | static void layout_sections(struct module *mod, | |
1195 | const Elf_Ehdr *hdr, | |
1196 | Elf_Shdr *sechdrs, | |
1197 | const char *secstrings) | |
1198 | { | |
1199 | static unsigned long const masks[][2] = { | |
1200 | /* NOTE: all executable code must be the first section | |
1201 | * in this array; otherwise modify the text_size | |
1202 | * finder in the two loops below */ | |
1203 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1204 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1205 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1206 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1207 | }; | |
1208 | unsigned int m, i; | |
1209 | ||
1210 | for (i = 0; i < hdr->e_shnum; i++) | |
1211 | sechdrs[i].sh_entsize = ~0UL; | |
1212 | ||
1213 | DEBUGP("Core section allocation order:\n"); | |
1214 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1215 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1216 | Elf_Shdr *s = &sechdrs[i]; | |
1217 | ||
1218 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1219 | || (s->sh_flags & masks[m][1]) | |
1220 | || s->sh_entsize != ~0UL | |
1221 | || strncmp(secstrings + s->sh_name, | |
1222 | ".init", 5) == 0) | |
1223 | continue; | |
1224 | s->sh_entsize = get_offset(&mod->core_size, s); | |
1225 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1226 | } | |
1227 | if (m == 0) | |
1228 | mod->core_text_size = mod->core_size; | |
1229 | } | |
1230 | ||
1231 | DEBUGP("Init section allocation order:\n"); | |
1232 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1233 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1234 | Elf_Shdr *s = &sechdrs[i]; | |
1235 | ||
1236 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1237 | || (s->sh_flags & masks[m][1]) | |
1238 | || s->sh_entsize != ~0UL | |
1239 | || strncmp(secstrings + s->sh_name, | |
1240 | ".init", 5) != 0) | |
1241 | continue; | |
1242 | s->sh_entsize = (get_offset(&mod->init_size, s) | |
1243 | | INIT_OFFSET_MASK); | |
1244 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1245 | } | |
1246 | if (m == 0) | |
1247 | mod->init_text_size = mod->init_size; | |
1248 | } | |
1249 | } | |
1250 | ||
1251 | static inline int license_is_gpl_compatible(const char *license) | |
1252 | { | |
1253 | return (strcmp(license, "GPL") == 0 | |
1254 | || strcmp(license, "GPL v2") == 0 | |
1255 | || strcmp(license, "GPL and additional rights") == 0 | |
1256 | || strcmp(license, "Dual BSD/GPL") == 0 | |
1257 | || strcmp(license, "Dual MPL/GPL") == 0); | |
1258 | } | |
1259 | ||
1260 | static void set_license(struct module *mod, const char *license) | |
1261 | { | |
1262 | if (!license) | |
1263 | license = "unspecified"; | |
1264 | ||
1265 | mod->license_gplok = license_is_gpl_compatible(license); | |
1266 | if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) { | |
1267 | printk(KERN_WARNING "%s: module license '%s' taints kernel.\n", | |
1268 | mod->name, license); | |
9f158333 | 1269 | add_taint(TAINT_PROPRIETARY_MODULE); |
1da177e4 LT |
1270 | } |
1271 | } | |
1272 | ||
1273 | /* Parse tag=value strings from .modinfo section */ | |
1274 | static char *next_string(char *string, unsigned long *secsize) | |
1275 | { | |
1276 | /* Skip non-zero chars */ | |
1277 | while (string[0]) { | |
1278 | string++; | |
1279 | if ((*secsize)-- <= 1) | |
1280 | return NULL; | |
1281 | } | |
1282 | ||
1283 | /* Skip any zero padding. */ | |
1284 | while (!string[0]) { | |
1285 | string++; | |
1286 | if ((*secsize)-- <= 1) | |
1287 | return NULL; | |
1288 | } | |
1289 | return string; | |
1290 | } | |
1291 | ||
1292 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1293 | unsigned int info, | |
1294 | const char *tag) | |
1295 | { | |
1296 | char *p; | |
1297 | unsigned int taglen = strlen(tag); | |
1298 | unsigned long size = sechdrs[info].sh_size; | |
1299 | ||
1300 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1301 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1302 | return p + taglen + 1; | |
1303 | } | |
1304 | return NULL; | |
1305 | } | |
1306 | ||
c988d2b2 MD |
1307 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1308 | unsigned int infoindex) | |
1309 | { | |
1310 | struct module_attribute *attr; | |
1311 | int i; | |
1312 | ||
1313 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1314 | if (attr->setup) | |
1315 | attr->setup(mod, | |
1316 | get_modinfo(sechdrs, | |
1317 | infoindex, | |
1318 | attr->attr.name)); | |
1319 | } | |
1320 | } | |
c988d2b2 | 1321 | |
1da177e4 LT |
1322 | #ifdef CONFIG_KALLSYMS |
1323 | int is_exported(const char *name, const struct module *mod) | |
1324 | { | |
3fd6805f SR |
1325 | if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) |
1326 | return 1; | |
1327 | else | |
1328 | if (lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) | |
1da177e4 | 1329 | return 1; |
3fd6805f SR |
1330 | else |
1331 | return 0; | |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | /* As per nm */ | |
1335 | static char elf_type(const Elf_Sym *sym, | |
1336 | Elf_Shdr *sechdrs, | |
1337 | const char *secstrings, | |
1338 | struct module *mod) | |
1339 | { | |
1340 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1341 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1342 | return 'v'; | |
1343 | else | |
1344 | return 'w'; | |
1345 | } | |
1346 | if (sym->st_shndx == SHN_UNDEF) | |
1347 | return 'U'; | |
1348 | if (sym->st_shndx == SHN_ABS) | |
1349 | return 'a'; | |
1350 | if (sym->st_shndx >= SHN_LORESERVE) | |
1351 | return '?'; | |
1352 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1353 | return 't'; | |
1354 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1355 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1356 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1357 | return 'r'; | |
1358 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1359 | return 'g'; | |
1360 | else | |
1361 | return 'd'; | |
1362 | } | |
1363 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1364 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1365 | return 's'; | |
1366 | else | |
1367 | return 'b'; | |
1368 | } | |
1369 | if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, | |
1370 | ".debug", strlen(".debug")) == 0) | |
1371 | return 'n'; | |
1372 | return '?'; | |
1373 | } | |
1374 | ||
1375 | static void add_kallsyms(struct module *mod, | |
1376 | Elf_Shdr *sechdrs, | |
1377 | unsigned int symindex, | |
1378 | unsigned int strindex, | |
1379 | const char *secstrings) | |
1380 | { | |
1381 | unsigned int i; | |
1382 | ||
1383 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
1384 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1385 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
1386 | ||
1387 | /* Set types up while we still have access to sections. */ | |
1388 | for (i = 0; i < mod->num_symtab; i++) | |
1389 | mod->symtab[i].st_info | |
1390 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
1391 | } | |
1392 | #else | |
1393 | static inline void add_kallsyms(struct module *mod, | |
1394 | Elf_Shdr *sechdrs, | |
1395 | unsigned int symindex, | |
1396 | unsigned int strindex, | |
1397 | const char *secstrings) | |
1398 | { | |
1399 | } | |
1400 | #endif /* CONFIG_KALLSYMS */ | |
1401 | ||
1402 | /* Allocate and load the module: note that size of section 0 is always | |
1403 | zero, and we rely on this for optional sections. */ | |
1404 | static struct module *load_module(void __user *umod, | |
1405 | unsigned long len, | |
1406 | const char __user *uargs) | |
1407 | { | |
1408 | Elf_Ehdr *hdr; | |
1409 | Elf_Shdr *sechdrs; | |
1410 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
1411 | unsigned int i, symindex = 0, strindex = 0, setupindex, exindex, | |
1412 | exportindex, modindex, obsparmindex, infoindex, gplindex, | |
9f28bb7e GKH |
1413 | crcindex, gplcrcindex, versindex, pcpuindex, gplfutureindex, |
1414 | gplfuturecrcindex; | |
1da177e4 LT |
1415 | struct module *mod; |
1416 | long err = 0; | |
1417 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ | |
1418 | struct exception_table_entry *extable; | |
378bac82 | 1419 | mm_segment_t old_fs; |
1da177e4 LT |
1420 | |
1421 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
1422 | umod, len, uargs); | |
1423 | if (len < sizeof(*hdr)) | |
1424 | return ERR_PTR(-ENOEXEC); | |
1425 | ||
1426 | /* Suck in entire file: we'll want most of it. */ | |
1427 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
1428 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
1429 | return ERR_PTR(-ENOMEM); | |
1430 | if (copy_from_user(hdr, umod, len) != 0) { | |
1431 | err = -EFAULT; | |
1432 | goto free_hdr; | |
1433 | } | |
1434 | ||
1435 | /* Sanity checks against insmoding binaries or wrong arch, | |
1436 | weird elf version */ | |
1437 | if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 | |
1438 | || hdr->e_type != ET_REL | |
1439 | || !elf_check_arch(hdr) | |
1440 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
1441 | err = -ENOEXEC; | |
1442 | goto free_hdr; | |
1443 | } | |
1444 | ||
1445 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
1446 | goto truncated; | |
1447 | ||
1448 | /* Convenience variables */ | |
1449 | sechdrs = (void *)hdr + hdr->e_shoff; | |
1450 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
1451 | sechdrs[0].sh_addr = 0; | |
1452 | ||
1453 | for (i = 1; i < hdr->e_shnum; i++) { | |
1454 | if (sechdrs[i].sh_type != SHT_NOBITS | |
1455 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
1456 | goto truncated; | |
1457 | ||
1458 | /* Mark all sections sh_addr with their address in the | |
1459 | temporary image. */ | |
1460 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
1461 | ||
1462 | /* Internal symbols and strings. */ | |
1463 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
1464 | symindex = i; | |
1465 | strindex = sechdrs[i].sh_link; | |
1466 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
1467 | } | |
1468 | #ifndef CONFIG_MODULE_UNLOAD | |
1469 | /* Don't load .exit sections */ | |
1470 | if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) | |
1471 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1472 | #endif | |
1473 | } | |
1474 | ||
1475 | modindex = find_sec(hdr, sechdrs, secstrings, | |
1476 | ".gnu.linkonce.this_module"); | |
1477 | if (!modindex) { | |
1478 | printk(KERN_WARNING "No module found in object\n"); | |
1479 | err = -ENOEXEC; | |
1480 | goto free_hdr; | |
1481 | } | |
1482 | mod = (void *)sechdrs[modindex].sh_addr; | |
1483 | ||
1484 | if (symindex == 0) { | |
1485 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
1486 | mod->name); | |
1487 | err = -ENOEXEC; | |
1488 | goto free_hdr; | |
1489 | } | |
1490 | ||
1491 | /* Optional sections */ | |
1492 | exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); | |
1493 | gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); | |
9f28bb7e | 1494 | gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future"); |
1da177e4 LT |
1495 | crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); |
1496 | gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
9f28bb7e | 1497 | gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future"); |
1da177e4 LT |
1498 | setupindex = find_sec(hdr, sechdrs, secstrings, "__param"); |
1499 | exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table"); | |
1500 | obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm"); | |
1501 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); | |
1502 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
1503 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
1504 | ||
1505 | /* Don't keep modinfo section */ | |
1506 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1507 | #ifdef CONFIG_KALLSYMS | |
1508 | /* Keep symbol and string tables for decoding later. */ | |
1509 | sechdrs[symindex].sh_flags |= SHF_ALLOC; | |
1510 | sechdrs[strindex].sh_flags |= SHF_ALLOC; | |
1511 | #endif | |
1512 | ||
1513 | /* Check module struct version now, before we try to use module. */ | |
1514 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
1515 | err = -ENOEXEC; | |
1516 | goto free_hdr; | |
1517 | } | |
1518 | ||
1519 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
1520 | /* This is allowed: modprobe --force will invalidate it. */ | |
1521 | if (!modmagic) { | |
9f158333 | 1522 | add_taint(TAINT_FORCED_MODULE); |
1da177e4 LT |
1523 | printk(KERN_WARNING "%s: no version magic, tainting kernel.\n", |
1524 | mod->name); | |
1525 | } else if (!same_magic(modmagic, vermagic)) { | |
1526 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", | |
1527 | mod->name, modmagic, vermagic); | |
1528 | err = -ENOEXEC; | |
1529 | goto free_hdr; | |
1530 | } | |
1531 | ||
1532 | /* Now copy in args */ | |
24277dda DA |
1533 | args = strndup_user(uargs, ~0UL >> 1); |
1534 | if (IS_ERR(args)) { | |
1535 | err = PTR_ERR(args); | |
1da177e4 LT |
1536 | goto free_hdr; |
1537 | } | |
8e08b756 | 1538 | |
1da177e4 LT |
1539 | if (find_module(mod->name)) { |
1540 | err = -EEXIST; | |
1541 | goto free_mod; | |
1542 | } | |
1543 | ||
1544 | mod->state = MODULE_STATE_COMING; | |
1545 | ||
1546 | /* Allow arches to frob section contents and sizes. */ | |
1547 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
1548 | if (err < 0) | |
1549 | goto free_mod; | |
1550 | ||
1551 | if (pcpuindex) { | |
1552 | /* We have a special allocation for this section. */ | |
1553 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, | |
842bbaaa RR |
1554 | sechdrs[pcpuindex].sh_addralign, |
1555 | mod->name); | |
1da177e4 LT |
1556 | if (!percpu) { |
1557 | err = -ENOMEM; | |
1558 | goto free_mod; | |
1559 | } | |
1560 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1561 | mod->percpu = percpu; | |
1562 | } | |
1563 | ||
1564 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
1565 | this is done generically; there doesn't appear to be any | |
1566 | special cases for the architectures. */ | |
1567 | layout_sections(mod, hdr, sechdrs, secstrings); | |
1568 | ||
1569 | /* Do the allocs. */ | |
1570 | ptr = module_alloc(mod->core_size); | |
1571 | if (!ptr) { | |
1572 | err = -ENOMEM; | |
1573 | goto free_percpu; | |
1574 | } | |
1575 | memset(ptr, 0, mod->core_size); | |
1576 | mod->module_core = ptr; | |
1577 | ||
1578 | ptr = module_alloc(mod->init_size); | |
1579 | if (!ptr && mod->init_size) { | |
1580 | err = -ENOMEM; | |
1581 | goto free_core; | |
1582 | } | |
1583 | memset(ptr, 0, mod->init_size); | |
1584 | mod->module_init = ptr; | |
1585 | ||
1586 | /* Transfer each section which specifies SHF_ALLOC */ | |
1587 | DEBUGP("final section addresses:\n"); | |
1588 | for (i = 0; i < hdr->e_shnum; i++) { | |
1589 | void *dest; | |
1590 | ||
1591 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1592 | continue; | |
1593 | ||
1594 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
1595 | dest = mod->module_init | |
1596 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
1597 | else | |
1598 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
1599 | ||
1600 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
1601 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
1602 | sechdrs[i].sh_size); | |
1603 | /* Update sh_addr to point to copy in image. */ | |
1604 | sechdrs[i].sh_addr = (unsigned long)dest; | |
1605 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
1606 | } | |
1607 | /* Module has been moved. */ | |
1608 | mod = (void *)sechdrs[modindex].sh_addr; | |
1609 | ||
1610 | /* Now we've moved module, initialize linked lists, etc. */ | |
1611 | module_unload_init(mod); | |
1612 | ||
1613 | /* Set up license info based on the info section */ | |
1614 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
1615 | ||
9841d61d DJ |
1616 | if (strcmp(mod->name, "ndiswrapper") == 0) |
1617 | add_taint(TAINT_PROPRIETARY_MODULE); | |
1618 | if (strcmp(mod->name, "driverloader") == 0) | |
1619 | add_taint(TAINT_PROPRIETARY_MODULE); | |
1620 | ||
c988d2b2 MD |
1621 | /* Set up MODINFO_ATTR fields */ |
1622 | setup_modinfo(mod, sechdrs, infoindex); | |
c988d2b2 | 1623 | |
1da177e4 LT |
1624 | /* Fix up syms, so that st_value is a pointer to location. */ |
1625 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
1626 | mod); | |
1627 | if (err < 0) | |
1628 | goto cleanup; | |
1629 | ||
1630 | /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ | |
1631 | mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms); | |
1632 | mod->syms = (void *)sechdrs[exportindex].sh_addr; | |
1633 | if (crcindex) | |
1634 | mod->crcs = (void *)sechdrs[crcindex].sh_addr; | |
1635 | mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms); | |
1636 | mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr; | |
1637 | if (gplcrcindex) | |
1638 | mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr; | |
9f28bb7e GKH |
1639 | mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size / |
1640 | sizeof(*mod->gpl_future_syms); | |
1641 | mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr; | |
1642 | if (gplfuturecrcindex) | |
1643 | mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr; | |
1da177e4 LT |
1644 | |
1645 | #ifdef CONFIG_MODVERSIONS | |
1646 | if ((mod->num_syms && !crcindex) || | |
9f28bb7e GKH |
1647 | (mod->num_gpl_syms && !gplcrcindex) || |
1648 | (mod->num_gpl_future_syms && !gplfuturecrcindex)) { | |
1da177e4 LT |
1649 | printk(KERN_WARNING "%s: No versions for exported symbols." |
1650 | " Tainting kernel.\n", mod->name); | |
9f158333 | 1651 | add_taint(TAINT_FORCED_MODULE); |
1da177e4 LT |
1652 | } |
1653 | #endif | |
1654 | ||
1655 | /* Now do relocations. */ | |
1656 | for (i = 1; i < hdr->e_shnum; i++) { | |
1657 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
1658 | unsigned int info = sechdrs[i].sh_info; | |
1659 | ||
1660 | /* Not a valid relocation section? */ | |
1661 | if (info >= hdr->e_shnum) | |
1662 | continue; | |
1663 | ||
1664 | /* Don't bother with non-allocated sections */ | |
1665 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
1666 | continue; | |
1667 | ||
1668 | if (sechdrs[i].sh_type == SHT_REL) | |
1669 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
1670 | else if (sechdrs[i].sh_type == SHT_RELA) | |
1671 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
1672 | mod); | |
1673 | if (err < 0) | |
1674 | goto cleanup; | |
1675 | } | |
1676 | ||
eea8b54d AN |
1677 | /* Find duplicate symbols */ |
1678 | err = verify_export_symbols(mod); | |
1679 | ||
1680 | if (err < 0) | |
1681 | goto cleanup; | |
1682 | ||
1da177e4 LT |
1683 | /* Set up and sort exception table */ |
1684 | mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable); | |
1685 | mod->extable = extable = (void *)sechdrs[exindex].sh_addr; | |
1686 | sort_extable(extable, extable + mod->num_exentries); | |
1687 | ||
1688 | /* Finally, copy percpu area over. */ | |
1689 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, | |
1690 | sechdrs[pcpuindex].sh_size); | |
1691 | ||
1692 | add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); | |
1693 | ||
1694 | err = module_finalize(hdr, sechdrs, mod); | |
1695 | if (err < 0) | |
1696 | goto cleanup; | |
1697 | ||
378bac82 TK |
1698 | /* flush the icache in correct context */ |
1699 | old_fs = get_fs(); | |
1700 | set_fs(KERNEL_DS); | |
1701 | ||
1702 | /* | |
1703 | * Flush the instruction cache, since we've played with text. | |
1704 | * Do it before processing of module parameters, so the module | |
1705 | * can provide parameter accessor functions of its own. | |
1706 | */ | |
1707 | if (mod->module_init) | |
1708 | flush_icache_range((unsigned long)mod->module_init, | |
1709 | (unsigned long)mod->module_init | |
1710 | + mod->init_size); | |
1711 | flush_icache_range((unsigned long)mod->module_core, | |
1712 | (unsigned long)mod->module_core + mod->core_size); | |
1713 | ||
1714 | set_fs(old_fs); | |
1715 | ||
1da177e4 | 1716 | mod->args = args; |
8d3b33f6 RR |
1717 | if (obsparmindex) |
1718 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", | |
1719 | mod->name); | |
1720 | ||
1721 | /* Size of section 0 is 0, so this works well if no params */ | |
1722 | err = parse_args(mod->name, mod->args, | |
1723 | (struct kernel_param *) | |
1724 | sechdrs[setupindex].sh_addr, | |
1725 | sechdrs[setupindex].sh_size | |
1726 | / sizeof(struct kernel_param), | |
1727 | NULL); | |
1da177e4 LT |
1728 | if (err < 0) |
1729 | goto arch_cleanup; | |
1730 | ||
1731 | err = mod_sysfs_setup(mod, | |
1732 | (struct kernel_param *) | |
1733 | sechdrs[setupindex].sh_addr, | |
1734 | sechdrs[setupindex].sh_size | |
1735 | / sizeof(struct kernel_param)); | |
1736 | if (err < 0) | |
1737 | goto arch_cleanup; | |
1738 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); | |
1739 | ||
1740 | /* Get rid of temporary copy */ | |
1741 | vfree(hdr); | |
1742 | ||
1743 | /* Done! */ | |
1744 | return mod; | |
1745 | ||
1746 | arch_cleanup: | |
1747 | module_arch_cleanup(mod); | |
1748 | cleanup: | |
1749 | module_unload_free(mod); | |
1750 | module_free(mod, mod->module_init); | |
1751 | free_core: | |
1752 | module_free(mod, mod->module_core); | |
1753 | free_percpu: | |
1754 | if (percpu) | |
1755 | percpu_modfree(percpu); | |
1756 | free_mod: | |
1757 | kfree(args); | |
1758 | free_hdr: | |
1759 | vfree(hdr); | |
6fe2e70b | 1760 | return ERR_PTR(err); |
1da177e4 LT |
1761 | |
1762 | truncated: | |
1763 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
1764 | err = -ENOEXEC; | |
1765 | goto free_hdr; | |
1766 | } | |
1767 | ||
1768 | /* | |
1769 | * link the module with the whole machine is stopped with interrupts off | |
1770 | * - this defends against kallsyms not taking locks | |
1771 | */ | |
1772 | static int __link_module(void *_mod) | |
1773 | { | |
1774 | struct module *mod = _mod; | |
1775 | list_add(&mod->list, &modules); | |
1776 | return 0; | |
1777 | } | |
1778 | ||
1779 | /* This is where the real work happens */ | |
1780 | asmlinkage long | |
1781 | sys_init_module(void __user *umod, | |
1782 | unsigned long len, | |
1783 | const char __user *uargs) | |
1784 | { | |
1785 | struct module *mod; | |
1786 | int ret = 0; | |
1787 | ||
1788 | /* Must have permission */ | |
1789 | if (!capable(CAP_SYS_MODULE)) | |
1790 | return -EPERM; | |
1791 | ||
1792 | /* Only one module load at a time, please */ | |
6389a385 | 1793 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
1794 | return -EINTR; |
1795 | ||
1796 | /* Do all the hard work */ | |
1797 | mod = load_module(umod, len, uargs); | |
1798 | if (IS_ERR(mod)) { | |
6389a385 | 1799 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1800 | return PTR_ERR(mod); |
1801 | } | |
1802 | ||
1da177e4 LT |
1803 | /* Now sew it into the lists. They won't access us, since |
1804 | strong_try_module_get() will fail. */ | |
1805 | stop_machine_run(__link_module, mod, NR_CPUS); | |
1806 | ||
1807 | /* Drop lock so they can recurse */ | |
6389a385 | 1808 | mutex_unlock(&module_mutex); |
1da177e4 | 1809 | |
e041c683 AS |
1810 | blocking_notifier_call_chain(&module_notify_list, |
1811 | MODULE_STATE_COMING, mod); | |
1da177e4 LT |
1812 | |
1813 | /* Start the module */ | |
1814 | if (mod->init != NULL) | |
1815 | ret = mod->init(); | |
1816 | if (ret < 0) { | |
1817 | /* Init routine failed: abort. Try to protect us from | |
1818 | buggy refcounters. */ | |
1819 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 1820 | synchronize_sched(); |
1da177e4 LT |
1821 | if (mod->unsafe) |
1822 | printk(KERN_ERR "%s: module is now stuck!\n", | |
1823 | mod->name); | |
1824 | else { | |
1825 | module_put(mod); | |
6389a385 | 1826 | mutex_lock(&module_mutex); |
1da177e4 | 1827 | free_module(mod); |
6389a385 | 1828 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1829 | } |
1830 | return ret; | |
1831 | } | |
1832 | ||
1833 | /* Now it's a first class citizen! */ | |
6389a385 | 1834 | mutex_lock(&module_mutex); |
1da177e4 LT |
1835 | mod->state = MODULE_STATE_LIVE; |
1836 | /* Drop initial reference. */ | |
1837 | module_put(mod); | |
1838 | module_free(mod, mod->module_init); | |
1839 | mod->module_init = NULL; | |
1840 | mod->init_size = 0; | |
1841 | mod->init_text_size = 0; | |
6389a385 | 1842 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1843 | |
1844 | return 0; | |
1845 | } | |
1846 | ||
1847 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
1848 | { | |
1849 | return ((void *)addr >= start && (void *)addr < start + size); | |
1850 | } | |
1851 | ||
1852 | #ifdef CONFIG_KALLSYMS | |
1853 | /* | |
1854 | * This ignores the intensely annoying "mapping symbols" found | |
1855 | * in ARM ELF files: $a, $t and $d. | |
1856 | */ | |
1857 | static inline int is_arm_mapping_symbol(const char *str) | |
1858 | { | |
1859 | return str[0] == '$' && strchr("atd", str[1]) | |
1860 | && (str[2] == '\0' || str[2] == '.'); | |
1861 | } | |
1862 | ||
1863 | static const char *get_ksymbol(struct module *mod, | |
1864 | unsigned long addr, | |
1865 | unsigned long *size, | |
1866 | unsigned long *offset) | |
1867 | { | |
1868 | unsigned int i, best = 0; | |
1869 | unsigned long nextval; | |
1870 | ||
1871 | /* At worse, next value is at end of module */ | |
1872 | if (within(addr, mod->module_init, mod->init_size)) | |
1873 | nextval = (unsigned long)mod->module_init+mod->init_text_size; | |
1874 | else | |
1875 | nextval = (unsigned long)mod->module_core+mod->core_text_size; | |
1876 | ||
1877 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
1878 | starts real symbols at 1). */ | |
1879 | for (i = 1; i < mod->num_symtab; i++) { | |
1880 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
1881 | continue; | |
1882 | ||
1883 | /* We ignore unnamed symbols: they're uninformative | |
1884 | * and inserted at a whim. */ | |
1885 | if (mod->symtab[i].st_value <= addr | |
1886 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
1887 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
1888 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
1889 | best = i; | |
1890 | if (mod->symtab[i].st_value > addr | |
1891 | && mod->symtab[i].st_value < nextval | |
1892 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
1893 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
1894 | nextval = mod->symtab[i].st_value; | |
1895 | } | |
1896 | ||
1897 | if (!best) | |
1898 | return NULL; | |
1899 | ||
1900 | *size = nextval - mod->symtab[best].st_value; | |
1901 | *offset = addr - mod->symtab[best].st_value; | |
1902 | return mod->strtab + mod->symtab[best].st_name; | |
1903 | } | |
1904 | ||
1905 | /* For kallsyms to ask for address resolution. NULL means not found. | |
1906 | We don't lock, as this is used for oops resolution and races are a | |
1907 | lesser concern. */ | |
1908 | const char *module_address_lookup(unsigned long addr, | |
1909 | unsigned long *size, | |
1910 | unsigned long *offset, | |
1911 | char **modname) | |
1912 | { | |
1913 | struct module *mod; | |
1914 | ||
1915 | list_for_each_entry(mod, &modules, list) { | |
1916 | if (within(addr, mod->module_init, mod->init_size) | |
1917 | || within(addr, mod->module_core, mod->core_size)) { | |
1918 | *modname = mod->name; | |
1919 | return get_ksymbol(mod, addr, size, offset); | |
1920 | } | |
1921 | } | |
1922 | return NULL; | |
1923 | } | |
1924 | ||
1925 | struct module *module_get_kallsym(unsigned int symnum, | |
1926 | unsigned long *value, | |
1927 | char *type, | |
1928 | char namebuf[128]) | |
1929 | { | |
1930 | struct module *mod; | |
1931 | ||
6389a385 | 1932 | mutex_lock(&module_mutex); |
1da177e4 LT |
1933 | list_for_each_entry(mod, &modules, list) { |
1934 | if (symnum < mod->num_symtab) { | |
1935 | *value = mod->symtab[symnum].st_value; | |
1936 | *type = mod->symtab[symnum].st_info; | |
1937 | strncpy(namebuf, | |
1938 | mod->strtab + mod->symtab[symnum].st_name, | |
1939 | 127); | |
6389a385 | 1940 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1941 | return mod; |
1942 | } | |
1943 | symnum -= mod->num_symtab; | |
1944 | } | |
6389a385 | 1945 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1946 | return NULL; |
1947 | } | |
1948 | ||
1949 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
1950 | { | |
1951 | unsigned int i; | |
1952 | ||
1953 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
1954 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
1955 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
1956 | return mod->symtab[i].st_value; |
1957 | return 0; | |
1958 | } | |
1959 | ||
1960 | /* Look for this name: can be of form module:name. */ | |
1961 | unsigned long module_kallsyms_lookup_name(const char *name) | |
1962 | { | |
1963 | struct module *mod; | |
1964 | char *colon; | |
1965 | unsigned long ret = 0; | |
1966 | ||
1967 | /* Don't lock: we're in enough trouble already. */ | |
1968 | if ((colon = strchr(name, ':')) != NULL) { | |
1969 | *colon = '\0'; | |
1970 | if ((mod = find_module(name)) != NULL) | |
1971 | ret = mod_find_symname(mod, colon+1); | |
1972 | *colon = ':'; | |
1973 | } else { | |
1974 | list_for_each_entry(mod, &modules, list) | |
1975 | if ((ret = mod_find_symname(mod, name)) != 0) | |
1976 | break; | |
1977 | } | |
1978 | return ret; | |
1979 | } | |
1980 | #endif /* CONFIG_KALLSYMS */ | |
1981 | ||
1982 | /* Called by the /proc file system to return a list of modules. */ | |
1983 | static void *m_start(struct seq_file *m, loff_t *pos) | |
1984 | { | |
1985 | struct list_head *i; | |
1986 | loff_t n = 0; | |
1987 | ||
6389a385 | 1988 | mutex_lock(&module_mutex); |
1da177e4 LT |
1989 | list_for_each(i, &modules) { |
1990 | if (n++ == *pos) | |
1991 | break; | |
1992 | } | |
1993 | if (i == &modules) | |
1994 | return NULL; | |
1995 | return i; | |
1996 | } | |
1997 | ||
1998 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
1999 | { | |
2000 | struct list_head *i = p; | |
2001 | (*pos)++; | |
2002 | if (i->next == &modules) | |
2003 | return NULL; | |
2004 | return i->next; | |
2005 | } | |
2006 | ||
2007 | static void m_stop(struct seq_file *m, void *p) | |
2008 | { | |
6389a385 | 2009 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2010 | } |
2011 | ||
2012 | static int m_show(struct seq_file *m, void *p) | |
2013 | { | |
2014 | struct module *mod = list_entry(p, struct module, list); | |
2015 | seq_printf(m, "%s %lu", | |
2016 | mod->name, mod->init_size + mod->core_size); | |
2017 | print_unload_info(m, mod); | |
2018 | ||
2019 | /* Informative for users. */ | |
2020 | seq_printf(m, " %s", | |
2021 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2022 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2023 | "Live"); | |
2024 | /* Used by oprofile and other similar tools. */ | |
2025 | seq_printf(m, " 0x%p", mod->module_core); | |
2026 | ||
2027 | seq_printf(m, "\n"); | |
2028 | return 0; | |
2029 | } | |
2030 | ||
2031 | /* Format: modulename size refcount deps address | |
2032 | ||
2033 | Where refcount is a number or -, and deps is a comma-separated list | |
2034 | of depends or -. | |
2035 | */ | |
2036 | struct seq_operations modules_op = { | |
2037 | .start = m_start, | |
2038 | .next = m_next, | |
2039 | .stop = m_stop, | |
2040 | .show = m_show | |
2041 | }; | |
2042 | ||
2043 | /* Given an address, look for it in the module exception tables. */ | |
2044 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2045 | { | |
2046 | unsigned long flags; | |
2047 | const struct exception_table_entry *e = NULL; | |
2048 | struct module *mod; | |
2049 | ||
2050 | spin_lock_irqsave(&modlist_lock, flags); | |
2051 | list_for_each_entry(mod, &modules, list) { | |
2052 | if (mod->num_exentries == 0) | |
2053 | continue; | |
2054 | ||
2055 | e = search_extable(mod->extable, | |
2056 | mod->extable + mod->num_exentries - 1, | |
2057 | addr); | |
2058 | if (e) | |
2059 | break; | |
2060 | } | |
2061 | spin_unlock_irqrestore(&modlist_lock, flags); | |
2062 | ||
2063 | /* Now, if we found one, we are running inside it now, hence | |
2064 | we cannot unload the module, hence no refcnt needed. */ | |
2065 | return e; | |
2066 | } | |
2067 | ||
2068 | /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */ | |
2069 | struct module *__module_text_address(unsigned long addr) | |
2070 | { | |
2071 | struct module *mod; | |
2072 | ||
2073 | list_for_each_entry(mod, &modules, list) | |
2074 | if (within(addr, mod->module_init, mod->init_text_size) | |
2075 | || within(addr, mod->module_core, mod->core_text_size)) | |
2076 | return mod; | |
2077 | return NULL; | |
2078 | } | |
2079 | ||
2080 | struct module *module_text_address(unsigned long addr) | |
2081 | { | |
2082 | struct module *mod; | |
2083 | unsigned long flags; | |
2084 | ||
2085 | spin_lock_irqsave(&modlist_lock, flags); | |
2086 | mod = __module_text_address(addr); | |
2087 | spin_unlock_irqrestore(&modlist_lock, flags); | |
2088 | ||
2089 | return mod; | |
2090 | } | |
2091 | ||
2092 | /* Don't grab lock, we're oopsing. */ | |
2093 | void print_modules(void) | |
2094 | { | |
2095 | struct module *mod; | |
2096 | ||
2097 | printk("Modules linked in:"); | |
2098 | list_for_each_entry(mod, &modules, list) | |
2099 | printk(" %s", mod->name); | |
2100 | printk("\n"); | |
2101 | } | |
2102 | ||
2103 | void module_add_driver(struct module *mod, struct device_driver *drv) | |
2104 | { | |
2105 | if (!mod || !drv) | |
2106 | return; | |
2107 | ||
2108 | /* Don't check return code; this call is idempotent */ | |
2109 | sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module"); | |
2110 | } | |
2111 | EXPORT_SYMBOL(module_add_driver); | |
2112 | ||
2113 | void module_remove_driver(struct device_driver *drv) | |
2114 | { | |
2115 | if (!drv) | |
2116 | return; | |
2117 | sysfs_remove_link(&drv->kobj, "module"); | |
2118 | } | |
2119 | EXPORT_SYMBOL(module_remove_driver); | |
2120 | ||
2121 | #ifdef CONFIG_MODVERSIONS | |
2122 | /* Generate the signature for struct module here, too, for modversions. */ | |
2123 | void struct_module(struct module *mod) { return; } | |
2124 | EXPORT_SYMBOL(struct_module); | |
2125 | #endif |