Commit | Line | Data |
---|---|---|
f71d20e9 | 1 | /* |
1da177e4 LT |
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 | */ | |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/moduleloader.h> | |
21 | #include <linux/init.h> | |
ae84e324 | 22 | #include <linux/kallsyms.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> | |
f6a57033 | 38 | #include <linux/sched.h> |
1da177e4 LT |
39 | #include <linux/stop_machine.h> |
40 | #include <linux/device.h> | |
c988d2b2 | 41 | #include <linux/string.h> |
97d1f15b | 42 | #include <linux/mutex.h> |
4552d5dc | 43 | #include <linux/unwind.h> |
1da177e4 LT |
44 | #include <asm/uaccess.h> |
45 | #include <asm/semaphore.h> | |
46 | #include <asm/cacheflush.h> | |
b817f6fe | 47 | #include <linux/license.h> |
1da177e4 | 48 | |
823bccfc GKH |
49 | extern int module_sysfs_initialized; |
50 | ||
1da177e4 LT |
51 | #if 0 |
52 | #define DEBUGP printk | |
53 | #else | |
54 | #define DEBUGP(fmt , a...) | |
55 | #endif | |
56 | ||
57 | #ifndef ARCH_SHF_SMALL | |
58 | #define ARCH_SHF_SMALL 0 | |
59 | #endif | |
60 | ||
61 | /* If this is set, the section belongs in the init part of the module */ | |
62 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
63 | ||
64 | /* Protects module list */ | |
65 | static DEFINE_SPINLOCK(modlist_lock); | |
66 | ||
67 | /* List of modules, protected by module_mutex AND modlist_lock */ | |
6389a385 | 68 | static DEFINE_MUTEX(module_mutex); |
1da177e4 LT |
69 | static LIST_HEAD(modules); |
70 | ||
e041c683 | 71 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 LT |
72 | |
73 | int register_module_notifier(struct notifier_block * nb) | |
74 | { | |
e041c683 | 75 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
76 | } |
77 | EXPORT_SYMBOL(register_module_notifier); | |
78 | ||
79 | int unregister_module_notifier(struct notifier_block * nb) | |
80 | { | |
e041c683 | 81 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
82 | } |
83 | EXPORT_SYMBOL(unregister_module_notifier); | |
84 | ||
85 | /* We require a truly strong try_module_get() */ | |
86 | static inline int strong_try_module_get(struct module *mod) | |
87 | { | |
88 | if (mod && mod->state == MODULE_STATE_COMING) | |
89 | return 0; | |
90 | return try_module_get(mod); | |
91 | } | |
92 | ||
fa3ba2e8 FM |
93 | static inline void add_taint_module(struct module *mod, unsigned flag) |
94 | { | |
95 | add_taint(flag); | |
96 | mod->taints |= flag; | |
97 | } | |
98 | ||
02a3e59a RD |
99 | /* |
100 | * A thread that wants to hold a reference to a module only while it | |
101 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
102 | */ |
103 | void __module_put_and_exit(struct module *mod, long code) | |
104 | { | |
105 | module_put(mod); | |
106 | do_exit(code); | |
107 | } | |
108 | EXPORT_SYMBOL(__module_put_and_exit); | |
109 | ||
110 | /* Find a module section: 0 means not found. */ | |
111 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
112 | Elf_Shdr *sechdrs, | |
113 | const char *secstrings, | |
114 | const char *name) | |
115 | { | |
116 | unsigned int i; | |
117 | ||
118 | for (i = 1; i < hdr->e_shnum; i++) | |
119 | /* Alloc bit cleared means "ignore it." */ | |
120 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
121 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
122 | return i; | |
123 | return 0; | |
124 | } | |
125 | ||
126 | /* Provided by the linker */ | |
127 | extern const struct kernel_symbol __start___ksymtab[]; | |
128 | extern const struct kernel_symbol __stop___ksymtab[]; | |
129 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
130 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
131 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
132 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
f71d20e9 AV |
133 | extern const struct kernel_symbol __start___ksymtab_unused[]; |
134 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
135 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
136 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
137 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; | |
138 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
139 | extern const unsigned long __start___kcrctab[]; |
140 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 141 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f71d20e9 AV |
142 | extern const unsigned long __start___kcrctab_unused[]; |
143 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
1da177e4 LT |
144 | |
145 | #ifndef CONFIG_MODVERSIONS | |
146 | #define symversion(base, idx) NULL | |
147 | #else | |
f83ca9fe | 148 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
149 | #endif |
150 | ||
3fd6805f SR |
151 | /* lookup symbol in given range of kernel_symbols */ |
152 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
153 | const struct kernel_symbol *start, | |
154 | const struct kernel_symbol *stop) | |
155 | { | |
156 | const struct kernel_symbol *ks = start; | |
157 | for (; ks < stop; ks++) | |
158 | if (strcmp(ks->name, name) == 0) | |
159 | return ks; | |
160 | return NULL; | |
161 | } | |
162 | ||
f71d20e9 AV |
163 | static void printk_unused_warning(const char *name) |
164 | { | |
165 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
166 | "however this module is using it.\n", name); | |
167 | printk(KERN_WARNING "This symbol will go away in the future.\n"); | |
168 | printk(KERN_WARNING "Please evalute if this is the right api to use, " | |
169 | "and if it really is, submit a report the linux kernel " | |
170 | "mailinglist together with submitting your code for " | |
171 | "inclusion.\n"); | |
172 | } | |
173 | ||
1da177e4 LT |
174 | /* Find a symbol, return value, crc and module which owns it */ |
175 | static unsigned long __find_symbol(const char *name, | |
176 | struct module **owner, | |
177 | const unsigned long **crc, | |
178 | int gplok) | |
179 | { | |
180 | struct module *mod; | |
3fd6805f | 181 | const struct kernel_symbol *ks; |
1da177e4 LT |
182 | |
183 | /* Core kernel first. */ | |
184 | *owner = NULL; | |
3fd6805f SR |
185 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
186 | if (ks) { | |
187 | *crc = symversion(__start___kcrctab, (ks - __start___ksymtab)); | |
188 | return ks->value; | |
1da177e4 LT |
189 | } |
190 | if (gplok) { | |
3fd6805f SR |
191 | ks = lookup_symbol(name, __start___ksymtab_gpl, |
192 | __stop___ksymtab_gpl); | |
193 | if (ks) { | |
194 | *crc = symversion(__start___kcrctab_gpl, | |
195 | (ks - __start___ksymtab_gpl)); | |
196 | return ks->value; | |
197 | } | |
1da177e4 | 198 | } |
9f28bb7e GKH |
199 | ks = lookup_symbol(name, __start___ksymtab_gpl_future, |
200 | __stop___ksymtab_gpl_future); | |
201 | if (ks) { | |
202 | if (!gplok) { | |
203 | printk(KERN_WARNING "Symbol %s is being used " | |
204 | "by a non-GPL module, which will not " | |
205 | "be allowed in the future\n", name); | |
206 | printk(KERN_WARNING "Please see the file " | |
207 | "Documentation/feature-removal-schedule.txt " | |
208 | "in the kernel source tree for more " | |
209 | "details.\n"); | |
210 | } | |
211 | *crc = symversion(__start___kcrctab_gpl_future, | |
212 | (ks - __start___ksymtab_gpl_future)); | |
213 | return ks->value; | |
214 | } | |
1da177e4 | 215 | |
f71d20e9 AV |
216 | ks = lookup_symbol(name, __start___ksymtab_unused, |
217 | __stop___ksymtab_unused); | |
218 | if (ks) { | |
219 | printk_unused_warning(name); | |
220 | *crc = symversion(__start___kcrctab_unused, | |
221 | (ks - __start___ksymtab_unused)); | |
222 | return ks->value; | |
223 | } | |
224 | ||
225 | if (gplok) | |
226 | ks = lookup_symbol(name, __start___ksymtab_unused_gpl, | |
227 | __stop___ksymtab_unused_gpl); | |
228 | if (ks) { | |
229 | printk_unused_warning(name); | |
230 | *crc = symversion(__start___kcrctab_unused_gpl, | |
231 | (ks - __start___ksymtab_unused_gpl)); | |
232 | return ks->value; | |
233 | } | |
234 | ||
1da177e4 LT |
235 | /* Now try modules. */ |
236 | list_for_each_entry(mod, &modules, list) { | |
237 | *owner = mod; | |
3fd6805f SR |
238 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
239 | if (ks) { | |
240 | *crc = symversion(mod->crcs, (ks - mod->syms)); | |
241 | return ks->value; | |
242 | } | |
1da177e4 LT |
243 | |
244 | if (gplok) { | |
3fd6805f SR |
245 | ks = lookup_symbol(name, mod->gpl_syms, |
246 | mod->gpl_syms + mod->num_gpl_syms); | |
247 | if (ks) { | |
248 | *crc = symversion(mod->gpl_crcs, | |
249 | (ks - mod->gpl_syms)); | |
250 | return ks->value; | |
1da177e4 LT |
251 | } |
252 | } | |
f71d20e9 AV |
253 | ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms); |
254 | if (ks) { | |
255 | printk_unused_warning(name); | |
256 | *crc = symversion(mod->unused_crcs, (ks - mod->unused_syms)); | |
257 | return ks->value; | |
258 | } | |
259 | ||
260 | if (gplok) { | |
261 | ks = lookup_symbol(name, mod->unused_gpl_syms, | |
262 | mod->unused_gpl_syms + mod->num_unused_gpl_syms); | |
263 | if (ks) { | |
264 | printk_unused_warning(name); | |
265 | *crc = symversion(mod->unused_gpl_crcs, | |
266 | (ks - mod->unused_gpl_syms)); | |
267 | return ks->value; | |
268 | } | |
269 | } | |
9f28bb7e GKH |
270 | ks = lookup_symbol(name, mod->gpl_future_syms, |
271 | (mod->gpl_future_syms + | |
272 | mod->num_gpl_future_syms)); | |
273 | if (ks) { | |
274 | if (!gplok) { | |
275 | printk(KERN_WARNING "Symbol %s is being used " | |
276 | "by a non-GPL module, which will not " | |
277 | "be allowed in the future\n", name); | |
278 | printk(KERN_WARNING "Please see the file " | |
279 | "Documentation/feature-removal-schedule.txt " | |
280 | "in the kernel source tree for more " | |
281 | "details.\n"); | |
282 | } | |
283 | *crc = symversion(mod->gpl_future_crcs, | |
284 | (ks - mod->gpl_future_syms)); | |
285 | return ks->value; | |
286 | } | |
1da177e4 LT |
287 | } |
288 | DEBUGP("Failed to find symbol %s\n", name); | |
289 | return 0; | |
290 | } | |
291 | ||
1da177e4 LT |
292 | /* Search for module by name: must hold module_mutex. */ |
293 | static struct module *find_module(const char *name) | |
294 | { | |
295 | struct module *mod; | |
296 | ||
297 | list_for_each_entry(mod, &modules, list) { | |
298 | if (strcmp(mod->name, name) == 0) | |
299 | return mod; | |
300 | } | |
301 | return NULL; | |
302 | } | |
303 | ||
304 | #ifdef CONFIG_SMP | |
305 | /* Number of blocks used and allocated. */ | |
306 | static unsigned int pcpu_num_used, pcpu_num_allocated; | |
307 | /* Size of each block. -ve means used. */ | |
308 | static int *pcpu_size; | |
309 | ||
310 | static int split_block(unsigned int i, unsigned short size) | |
311 | { | |
312 | /* Reallocation required? */ | |
313 | if (pcpu_num_used + 1 > pcpu_num_allocated) { | |
6d4f9c55 PE |
314 | int *new; |
315 | ||
316 | new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, | |
317 | GFP_KERNEL); | |
1da177e4 LT |
318 | if (!new) |
319 | return 0; | |
320 | ||
1da177e4 | 321 | pcpu_num_allocated *= 2; |
1da177e4 LT |
322 | pcpu_size = new; |
323 | } | |
324 | ||
325 | /* Insert a new subblock */ | |
326 | memmove(&pcpu_size[i+1], &pcpu_size[i], | |
327 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); | |
328 | pcpu_num_used++; | |
329 | ||
330 | pcpu_size[i+1] -= size; | |
331 | pcpu_size[i] = size; | |
332 | return 1; | |
333 | } | |
334 | ||
335 | static inline unsigned int block_size(int val) | |
336 | { | |
337 | if (val < 0) | |
338 | return -val; | |
339 | return val; | |
340 | } | |
341 | ||
342 | /* Created by linker magic */ | |
343 | extern char __per_cpu_start[], __per_cpu_end[]; | |
344 | ||
842bbaaa RR |
345 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
346 | const char *name) | |
1da177e4 LT |
347 | { |
348 | unsigned long extra; | |
349 | unsigned int i; | |
350 | void *ptr; | |
351 | ||
b6e3590f JF |
352 | if (align > PAGE_SIZE) { |
353 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
354 | name, align, PAGE_SIZE); | |
355 | align = PAGE_SIZE; | |
842bbaaa | 356 | } |
1da177e4 LT |
357 | |
358 | ptr = __per_cpu_start; | |
359 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
360 | /* Extra for alignment requirement. */ | |
361 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; | |
362 | BUG_ON(i == 0 && extra != 0); | |
363 | ||
364 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) | |
365 | continue; | |
366 | ||
367 | /* Transfer extra to previous block. */ | |
368 | if (pcpu_size[i-1] < 0) | |
369 | pcpu_size[i-1] -= extra; | |
370 | else | |
371 | pcpu_size[i-1] += extra; | |
372 | pcpu_size[i] -= extra; | |
373 | ptr += extra; | |
374 | ||
375 | /* Split block if warranted */ | |
376 | if (pcpu_size[i] - size > sizeof(unsigned long)) | |
377 | if (!split_block(i, size)) | |
378 | return NULL; | |
379 | ||
380 | /* Mark allocated */ | |
381 | pcpu_size[i] = -pcpu_size[i]; | |
382 | return ptr; | |
383 | } | |
384 | ||
385 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", | |
386 | size); | |
387 | return NULL; | |
388 | } | |
389 | ||
390 | static void percpu_modfree(void *freeme) | |
391 | { | |
392 | unsigned int i; | |
393 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); | |
394 | ||
395 | /* First entry is core kernel percpu data. */ | |
396 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
397 | if (ptr == freeme) { | |
398 | pcpu_size[i] = -pcpu_size[i]; | |
399 | goto free; | |
400 | } | |
401 | } | |
402 | BUG(); | |
403 | ||
404 | free: | |
405 | /* Merge with previous? */ | |
406 | if (pcpu_size[i-1] >= 0) { | |
407 | pcpu_size[i-1] += pcpu_size[i]; | |
408 | pcpu_num_used--; | |
409 | memmove(&pcpu_size[i], &pcpu_size[i+1], | |
410 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); | |
411 | i--; | |
412 | } | |
413 | /* Merge with next? */ | |
414 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { | |
415 | pcpu_size[i] += pcpu_size[i+1]; | |
416 | pcpu_num_used--; | |
417 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], | |
418 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); | |
419 | } | |
420 | } | |
421 | ||
422 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
423 | Elf_Shdr *sechdrs, | |
424 | const char *secstrings) | |
425 | { | |
426 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); | |
427 | } | |
428 | ||
429 | static int percpu_modinit(void) | |
430 | { | |
431 | pcpu_num_used = 2; | |
432 | pcpu_num_allocated = 2; | |
433 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, | |
434 | GFP_KERNEL); | |
435 | /* Static in-kernel percpu data (used). */ | |
b00742d3 | 436 | pcpu_size[0] = -(__per_cpu_end-__per_cpu_start); |
1da177e4 LT |
437 | /* Free room. */ |
438 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; | |
439 | if (pcpu_size[1] < 0) { | |
440 | printk(KERN_ERR "No per-cpu room for modules.\n"); | |
441 | pcpu_num_used = 1; | |
442 | } | |
443 | ||
444 | return 0; | |
445 | } | |
446 | __initcall(percpu_modinit); | |
447 | #else /* ... !CONFIG_SMP */ | |
842bbaaa RR |
448 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
449 | const char *name) | |
1da177e4 LT |
450 | { |
451 | return NULL; | |
452 | } | |
453 | static inline void percpu_modfree(void *pcpuptr) | |
454 | { | |
455 | BUG(); | |
456 | } | |
457 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
458 | Elf_Shdr *sechdrs, | |
459 | const char *secstrings) | |
460 | { | |
461 | return 0; | |
462 | } | |
463 | static inline void percpu_modcopy(void *pcpudst, const void *src, | |
464 | unsigned long size) | |
465 | { | |
466 | /* pcpusec should be 0, and size of that section should be 0. */ | |
467 | BUG_ON(size != 0); | |
468 | } | |
469 | #endif /* CONFIG_SMP */ | |
470 | ||
c988d2b2 MD |
471 | #define MODINFO_ATTR(field) \ |
472 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
473 | { \ | |
474 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
475 | } \ | |
476 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
477 | struct module *mod, char *buffer) \ | |
478 | { \ | |
479 | return sprintf(buffer, "%s\n", mod->field); \ | |
480 | } \ | |
481 | static int modinfo_##field##_exists(struct module *mod) \ | |
482 | { \ | |
483 | return mod->field != NULL; \ | |
484 | } \ | |
485 | static void free_modinfo_##field(struct module *mod) \ | |
486 | { \ | |
487 | kfree(mod->field); \ | |
488 | mod->field = NULL; \ | |
489 | } \ | |
490 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 491 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
492 | .show = show_modinfo_##field, \ |
493 | .setup = setup_modinfo_##field, \ | |
494 | .test = modinfo_##field##_exists, \ | |
495 | .free = free_modinfo_##field, \ | |
496 | }; | |
497 | ||
498 | MODINFO_ATTR(version); | |
499 | MODINFO_ATTR(srcversion); | |
500 | ||
03e88ae1 | 501 | #ifdef CONFIG_MODULE_UNLOAD |
1da177e4 LT |
502 | /* Init the unload section of the module. */ |
503 | static void module_unload_init(struct module *mod) | |
504 | { | |
505 | unsigned int i; | |
506 | ||
507 | INIT_LIST_HEAD(&mod->modules_which_use_me); | |
508 | for (i = 0; i < NR_CPUS; i++) | |
509 | local_set(&mod->ref[i].count, 0); | |
510 | /* Hold reference count during initialization. */ | |
39c715b7 | 511 | local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
1da177e4 LT |
512 | /* Backwards compatibility macros put refcount during init. */ |
513 | mod->waiter = current; | |
514 | } | |
515 | ||
516 | /* modules using other modules */ | |
517 | struct module_use | |
518 | { | |
519 | struct list_head list; | |
520 | struct module *module_which_uses; | |
521 | }; | |
522 | ||
523 | /* Does a already use b? */ | |
524 | static int already_uses(struct module *a, struct module *b) | |
525 | { | |
526 | struct module_use *use; | |
527 | ||
528 | list_for_each_entry(use, &b->modules_which_use_me, list) { | |
529 | if (use->module_which_uses == a) { | |
530 | DEBUGP("%s uses %s!\n", a->name, b->name); | |
531 | return 1; | |
532 | } | |
533 | } | |
534 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | /* Module a uses b */ | |
539 | static int use_module(struct module *a, struct module *b) | |
540 | { | |
541 | struct module_use *use; | |
270a6c4c KS |
542 | int no_warn; |
543 | ||
1da177e4 LT |
544 | if (b == NULL || already_uses(a, b)) return 1; |
545 | ||
546 | if (!strong_try_module_get(b)) | |
547 | return 0; | |
548 | ||
549 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
550 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
551 | if (!use) { | |
552 | printk("%s: out of memory loading\n", a->name); | |
553 | module_put(b); | |
554 | return 0; | |
555 | } | |
556 | ||
557 | use->module_which_uses = a; | |
558 | list_add(&use->list, &b->modules_which_use_me); | |
270a6c4c | 559 | no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
1da177e4 LT |
560 | return 1; |
561 | } | |
562 | ||
563 | /* Clear the unload stuff of the module. */ | |
564 | static void module_unload_free(struct module *mod) | |
565 | { | |
566 | struct module *i; | |
567 | ||
568 | list_for_each_entry(i, &modules, list) { | |
569 | struct module_use *use; | |
570 | ||
571 | list_for_each_entry(use, &i->modules_which_use_me, list) { | |
572 | if (use->module_which_uses == mod) { | |
573 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
574 | module_put(i); | |
575 | list_del(&use->list); | |
576 | kfree(use); | |
270a6c4c | 577 | sysfs_remove_link(i->holders_dir, mod->name); |
1da177e4 LT |
578 | /* There can be at most one match. */ |
579 | break; | |
580 | } | |
581 | } | |
582 | } | |
583 | } | |
584 | ||
585 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 586 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
587 | { |
588 | int ret = (flags & O_TRUNC); | |
589 | if (ret) | |
fb169793 | 590 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
591 | return ret; |
592 | } | |
593 | #else | |
fb169793 | 594 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
595 | { |
596 | return 0; | |
597 | } | |
598 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
599 | ||
600 | struct stopref | |
601 | { | |
602 | struct module *mod; | |
603 | int flags; | |
604 | int *forced; | |
605 | }; | |
606 | ||
607 | /* Whole machine is stopped with interrupts off when this runs. */ | |
608 | static int __try_stop_module(void *_sref) | |
609 | { | |
610 | struct stopref *sref = _sref; | |
611 | ||
612 | /* If it's not unused, quit unless we are told to block. */ | |
613 | if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) { | |
fb169793 | 614 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
615 | return -EWOULDBLOCK; |
616 | } | |
617 | ||
618 | /* Mark it as dying. */ | |
619 | sref->mod->state = MODULE_STATE_GOING; | |
620 | return 0; | |
621 | } | |
622 | ||
623 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
624 | { | |
625 | struct stopref sref = { mod, flags, forced }; | |
626 | ||
627 | return stop_machine_run(__try_stop_module, &sref, NR_CPUS); | |
628 | } | |
629 | ||
630 | unsigned int module_refcount(struct module *mod) | |
631 | { | |
632 | unsigned int i, total = 0; | |
633 | ||
634 | for (i = 0; i < NR_CPUS; i++) | |
635 | total += local_read(&mod->ref[i].count); | |
636 | return total; | |
637 | } | |
638 | EXPORT_SYMBOL(module_refcount); | |
639 | ||
640 | /* This exists whether we can unload or not */ | |
641 | static void free_module(struct module *mod); | |
642 | ||
643 | static void wait_for_zero_refcount(struct module *mod) | |
644 | { | |
645 | /* Since we might sleep for some time, drop the semaphore first */ | |
6389a385 | 646 | mutex_unlock(&module_mutex); |
1da177e4 LT |
647 | for (;;) { |
648 | DEBUGP("Looking at refcount...\n"); | |
649 | set_current_state(TASK_UNINTERRUPTIBLE); | |
650 | if (module_refcount(mod) == 0) | |
651 | break; | |
652 | schedule(); | |
653 | } | |
654 | current->state = TASK_RUNNING; | |
6389a385 | 655 | mutex_lock(&module_mutex); |
1da177e4 LT |
656 | } |
657 | ||
dfff0a06 GKH |
658 | asmlinkage long |
659 | sys_delete_module(const char __user *name_user, unsigned int flags) | |
1da177e4 LT |
660 | { |
661 | struct module *mod; | |
dfff0a06 | 662 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
663 | int ret, forced = 0; |
664 | ||
dfff0a06 GKH |
665 | if (!capable(CAP_SYS_MODULE)) |
666 | return -EPERM; | |
667 | ||
668 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
669 | return -EFAULT; | |
670 | name[MODULE_NAME_LEN-1] = '\0'; | |
671 | ||
6389a385 | 672 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
673 | return -EINTR; |
674 | ||
675 | mod = find_module(name); | |
676 | if (!mod) { | |
677 | ret = -ENOENT; | |
678 | goto out; | |
679 | } | |
680 | ||
681 | if (!list_empty(&mod->modules_which_use_me)) { | |
682 | /* Other modules depend on us: get rid of them first. */ | |
683 | ret = -EWOULDBLOCK; | |
684 | goto out; | |
685 | } | |
686 | ||
687 | /* Doing init or already dying? */ | |
688 | if (mod->state != MODULE_STATE_LIVE) { | |
689 | /* FIXME: if (force), slam module count and wake up | |
690 | waiter --RR */ | |
691 | DEBUGP("%s already dying\n", mod->name); | |
692 | ret = -EBUSY; | |
693 | goto out; | |
694 | } | |
695 | ||
696 | /* If it has an init func, it must have an exit func to unload */ | |
697 | if ((mod->init != NULL && mod->exit == NULL) | |
698 | || mod->unsafe) { | |
fb169793 | 699 | forced = try_force_unload(flags); |
1da177e4 LT |
700 | if (!forced) { |
701 | /* This module can't be removed */ | |
702 | ret = -EBUSY; | |
703 | goto out; | |
704 | } | |
705 | } | |
706 | ||
707 | /* Set this up before setting mod->state */ | |
708 | mod->waiter = current; | |
709 | ||
710 | /* Stop the machine so refcounts can't move and disable module. */ | |
711 | ret = try_stop_module(mod, flags, &forced); | |
712 | if (ret != 0) | |
713 | goto out; | |
714 | ||
715 | /* Never wait if forced. */ | |
716 | if (!forced && module_refcount(mod) != 0) | |
717 | wait_for_zero_refcount(mod); | |
718 | ||
719 | /* Final destruction now noone is using it. */ | |
720 | if (mod->exit != NULL) { | |
6389a385 | 721 | mutex_unlock(&module_mutex); |
1da177e4 | 722 | mod->exit(); |
6389a385 | 723 | mutex_lock(&module_mutex); |
1da177e4 LT |
724 | } |
725 | free_module(mod); | |
726 | ||
727 | out: | |
6389a385 | 728 | mutex_unlock(&module_mutex); |
1da177e4 LT |
729 | return ret; |
730 | } | |
731 | ||
732 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
733 | { | |
734 | struct module_use *use; | |
735 | int printed_something = 0; | |
736 | ||
737 | seq_printf(m, " %u ", module_refcount(mod)); | |
738 | ||
739 | /* Always include a trailing , so userspace can differentiate | |
740 | between this and the old multi-field proc format. */ | |
741 | list_for_each_entry(use, &mod->modules_which_use_me, list) { | |
742 | printed_something = 1; | |
743 | seq_printf(m, "%s,", use->module_which_uses->name); | |
744 | } | |
745 | ||
746 | if (mod->unsafe) { | |
747 | printed_something = 1; | |
748 | seq_printf(m, "[unsafe],"); | |
749 | } | |
750 | ||
751 | if (mod->init != NULL && mod->exit == NULL) { | |
752 | printed_something = 1; | |
753 | seq_printf(m, "[permanent],"); | |
754 | } | |
755 | ||
756 | if (!printed_something) | |
757 | seq_printf(m, "-"); | |
758 | } | |
759 | ||
760 | void __symbol_put(const char *symbol) | |
761 | { | |
762 | struct module *owner; | |
763 | unsigned long flags; | |
764 | const unsigned long *crc; | |
765 | ||
766 | spin_lock_irqsave(&modlist_lock, flags); | |
767 | if (!__find_symbol(symbol, &owner, &crc, 1)) | |
768 | BUG(); | |
769 | module_put(owner); | |
770 | spin_unlock_irqrestore(&modlist_lock, flags); | |
771 | } | |
772 | EXPORT_SYMBOL(__symbol_put); | |
773 | ||
774 | void symbol_put_addr(void *addr) | |
775 | { | |
5e376613 | 776 | struct module *modaddr; |
1da177e4 | 777 | |
5e376613 TP |
778 | if (core_kernel_text((unsigned long)addr)) |
779 | return; | |
1da177e4 | 780 | |
5e376613 TP |
781 | if (!(modaddr = module_text_address((unsigned long)addr))) |
782 | BUG(); | |
783 | module_put(modaddr); | |
1da177e4 LT |
784 | } |
785 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
786 | ||
787 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
788 | struct module *mod, char *buffer) | |
789 | { | |
790 | /* sysfs holds a reference */ | |
791 | return sprintf(buffer, "%u\n", module_refcount(mod)-1); | |
792 | } | |
793 | ||
794 | static struct module_attribute refcnt = { | |
7b595756 | 795 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
796 | .show = show_refcnt, |
797 | }; | |
798 | ||
f6a57033 AV |
799 | void module_put(struct module *module) |
800 | { | |
801 | if (module) { | |
802 | unsigned int cpu = get_cpu(); | |
803 | local_dec(&module->ref[cpu].count); | |
804 | /* Maybe they're waiting for us to drop reference? */ | |
805 | if (unlikely(!module_is_live(module))) | |
806 | wake_up_process(module->waiter); | |
807 | put_cpu(); | |
808 | } | |
809 | } | |
810 | EXPORT_SYMBOL(module_put); | |
811 | ||
1da177e4 LT |
812 | #else /* !CONFIG_MODULE_UNLOAD */ |
813 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
814 | { | |
815 | /* We don't know the usage count, or what modules are using. */ | |
816 | seq_printf(m, " - -"); | |
817 | } | |
818 | ||
819 | static inline void module_unload_free(struct module *mod) | |
820 | { | |
821 | } | |
822 | ||
823 | static inline int use_module(struct module *a, struct module *b) | |
824 | { | |
825 | return strong_try_module_get(b); | |
826 | } | |
827 | ||
828 | static inline void module_unload_init(struct module *mod) | |
829 | { | |
830 | } | |
831 | #endif /* CONFIG_MODULE_UNLOAD */ | |
832 | ||
1f71740a KS |
833 | static ssize_t show_initstate(struct module_attribute *mattr, |
834 | struct module *mod, char *buffer) | |
835 | { | |
836 | const char *state = "unknown"; | |
837 | ||
838 | switch (mod->state) { | |
839 | case MODULE_STATE_LIVE: | |
840 | state = "live"; | |
841 | break; | |
842 | case MODULE_STATE_COMING: | |
843 | state = "coming"; | |
844 | break; | |
845 | case MODULE_STATE_GOING: | |
846 | state = "going"; | |
847 | break; | |
848 | } | |
849 | return sprintf(buffer, "%s\n", state); | |
850 | } | |
851 | ||
852 | static struct module_attribute initstate = { | |
7b595756 | 853 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
854 | .show = show_initstate, |
855 | }; | |
856 | ||
03e88ae1 GKH |
857 | static struct module_attribute *modinfo_attrs[] = { |
858 | &modinfo_version, | |
859 | &modinfo_srcversion, | |
1f71740a | 860 | &initstate, |
03e88ae1 GKH |
861 | #ifdef CONFIG_MODULE_UNLOAD |
862 | &refcnt, | |
863 | #endif | |
864 | NULL, | |
865 | }; | |
866 | ||
1da177e4 LT |
867 | static const char vermagic[] = VERMAGIC_STRING; |
868 | ||
869 | #ifdef CONFIG_MODVERSIONS | |
870 | static int check_version(Elf_Shdr *sechdrs, | |
871 | unsigned int versindex, | |
872 | const char *symname, | |
873 | struct module *mod, | |
874 | const unsigned long *crc) | |
875 | { | |
876 | unsigned int i, num_versions; | |
877 | struct modversion_info *versions; | |
878 | ||
879 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
880 | if (!crc) | |
881 | return 1; | |
882 | ||
883 | versions = (void *) sechdrs[versindex].sh_addr; | |
884 | num_versions = sechdrs[versindex].sh_size | |
885 | / sizeof(struct modversion_info); | |
886 | ||
887 | for (i = 0; i < num_versions; i++) { | |
888 | if (strcmp(versions[i].name, symname) != 0) | |
889 | continue; | |
890 | ||
891 | if (versions[i].crc == *crc) | |
892 | return 1; | |
893 | printk("%s: disagrees about version of symbol %s\n", | |
894 | mod->name, symname); | |
895 | DEBUGP("Found checksum %lX vs module %lX\n", | |
896 | *crc, versions[i].crc); | |
897 | return 0; | |
898 | } | |
899 | /* Not in module's version table. OK, but that taints the kernel. */ | |
fa3ba2e8 | 900 | if (!(tainted & TAINT_FORCED_MODULE)) |
1da177e4 LT |
901 | printk("%s: no version for \"%s\" found: kernel tainted.\n", |
902 | mod->name, symname); | |
fa3ba2e8 | 903 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1da177e4 LT |
904 | return 1; |
905 | } | |
906 | ||
907 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
908 | unsigned int versindex, | |
909 | struct module *mod) | |
910 | { | |
911 | const unsigned long *crc; | |
912 | struct module *owner; | |
913 | ||
914 | if (!__find_symbol("struct_module", &owner, &crc, 1)) | |
915 | BUG(); | |
916 | return check_version(sechdrs, versindex, "struct_module", mod, | |
917 | crc); | |
918 | } | |
919 | ||
920 | /* First part is kernel version, which we ignore. */ | |
921 | static inline int same_magic(const char *amagic, const char *bmagic) | |
922 | { | |
923 | amagic += strcspn(amagic, " "); | |
924 | bmagic += strcspn(bmagic, " "); | |
925 | return strcmp(amagic, bmagic) == 0; | |
926 | } | |
927 | #else | |
928 | static inline int check_version(Elf_Shdr *sechdrs, | |
929 | unsigned int versindex, | |
930 | const char *symname, | |
931 | struct module *mod, | |
932 | const unsigned long *crc) | |
933 | { | |
934 | return 1; | |
935 | } | |
936 | ||
937 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
938 | unsigned int versindex, | |
939 | struct module *mod) | |
940 | { | |
941 | return 1; | |
942 | } | |
943 | ||
944 | static inline int same_magic(const char *amagic, const char *bmagic) | |
945 | { | |
946 | return strcmp(amagic, bmagic) == 0; | |
947 | } | |
948 | #endif /* CONFIG_MODVERSIONS */ | |
949 | ||
950 | /* Resolve a symbol for this module. I.e. if we find one, record usage. | |
951 | Must be holding module_mutex. */ | |
952 | static unsigned long resolve_symbol(Elf_Shdr *sechdrs, | |
953 | unsigned int versindex, | |
954 | const char *name, | |
955 | struct module *mod) | |
956 | { | |
957 | struct module *owner; | |
958 | unsigned long ret; | |
959 | const unsigned long *crc; | |
960 | ||
fa3ba2e8 FM |
961 | ret = __find_symbol(name, &owner, &crc, |
962 | !(mod->taints & TAINT_PROPRIETARY_MODULE)); | |
1da177e4 LT |
963 | if (ret) { |
964 | /* use_module can fail due to OOM, or module unloading */ | |
965 | if (!check_version(sechdrs, versindex, name, mod, crc) || | |
966 | !use_module(mod, owner)) | |
967 | ret = 0; | |
968 | } | |
1da177e4 LT |
969 | return ret; |
970 | } | |
971 | ||
972 | ||
973 | /* | |
974 | * /sys/module/foo/sections stuff | |
975 | * J. Corbet <corbet@lwn.net> | |
976 | */ | |
977 | #ifdef CONFIG_KALLSYMS | |
978 | static ssize_t module_sect_show(struct module_attribute *mattr, | |
979 | struct module *mod, char *buf) | |
980 | { | |
981 | struct module_sect_attr *sattr = | |
982 | container_of(mattr, struct module_sect_attr, mattr); | |
983 | return sprintf(buf, "0x%lx\n", sattr->address); | |
984 | } | |
985 | ||
04b1db9f IN |
986 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
987 | { | |
988 | int section; | |
989 | ||
990 | for (section = 0; section < sect_attrs->nsections; section++) | |
991 | kfree(sect_attrs->attrs[section].name); | |
992 | kfree(sect_attrs); | |
993 | } | |
994 | ||
1da177e4 LT |
995 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
996 | char *secstrings, Elf_Shdr *sechdrs) | |
997 | { | |
998 | unsigned int nloaded = 0, i, size[2]; | |
999 | struct module_sect_attrs *sect_attrs; | |
1000 | struct module_sect_attr *sattr; | |
1001 | struct attribute **gattr; | |
1002 | ||
1003 | /* Count loaded sections and allocate structures */ | |
1004 | for (i = 0; i < nsect; i++) | |
1005 | if (sechdrs[i].sh_flags & SHF_ALLOC) | |
1006 | nloaded++; | |
1007 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1008 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1009 | sizeof(sect_attrs->grp.attrs[0])); | |
1010 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1011 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1012 | if (sect_attrs == NULL) | |
1da177e4 LT |
1013 | return; |
1014 | ||
1015 | /* Setup section attributes. */ | |
1016 | sect_attrs->grp.name = "sections"; | |
1017 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1018 | ||
04b1db9f | 1019 | sect_attrs->nsections = 0; |
1da177e4 LT |
1020 | sattr = §_attrs->attrs[0]; |
1021 | gattr = §_attrs->grp.attrs[0]; | |
1022 | for (i = 0; i < nsect; i++) { | |
1023 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) | |
1024 | continue; | |
1025 | sattr->address = sechdrs[i].sh_addr; | |
04b1db9f IN |
1026 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1027 | GFP_KERNEL); | |
1028 | if (sattr->name == NULL) | |
1029 | goto out; | |
1030 | sect_attrs->nsections++; | |
1da177e4 LT |
1031 | sattr->mattr.show = module_sect_show; |
1032 | sattr->mattr.store = NULL; | |
1033 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1034 | sattr->mattr.attr.mode = S_IRUGO; |
1035 | *(gattr++) = &(sattr++)->mattr.attr; | |
1036 | } | |
1037 | *gattr = NULL; | |
1038 | ||
1039 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1040 | goto out; | |
1041 | ||
1042 | mod->sect_attrs = sect_attrs; | |
1043 | return; | |
1044 | out: | |
04b1db9f | 1045 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1046 | } |
1047 | ||
1048 | static void remove_sect_attrs(struct module *mod) | |
1049 | { | |
1050 | if (mod->sect_attrs) { | |
1051 | sysfs_remove_group(&mod->mkobj.kobj, | |
1052 | &mod->sect_attrs->grp); | |
1053 | /* We are positive that no one is using any sect attrs | |
1054 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1055 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1056 | mod->sect_attrs = NULL; |
1057 | } | |
1058 | } | |
1059 | ||
1da177e4 | 1060 | #else |
04b1db9f | 1061 | |
1da177e4 LT |
1062 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1063 | char *sectstrings, Elf_Shdr *sechdrs) | |
1064 | { | |
1065 | } | |
1066 | ||
1067 | static inline void remove_sect_attrs(struct module *mod) | |
1068 | { | |
1069 | } | |
1070 | #endif /* CONFIG_KALLSYMS */ | |
1071 | ||
ef665c1a RD |
1072 | #ifdef CONFIG_SYSFS |
1073 | int module_add_modinfo_attrs(struct module *mod) | |
c988d2b2 MD |
1074 | { |
1075 | struct module_attribute *attr; | |
03e88ae1 | 1076 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1077 | int error = 0; |
1078 | int i; | |
1079 | ||
03e88ae1 GKH |
1080 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1081 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1082 | GFP_KERNEL); | |
1083 | if (!mod->modinfo_attrs) | |
1084 | return -ENOMEM; | |
1085 | ||
1086 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1087 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1088 | if (!attr->test || | |
03e88ae1 GKH |
1089 | (attr->test && attr->test(mod))) { |
1090 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
03e88ae1 GKH |
1091 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1092 | ++temp_attr; | |
1093 | } | |
c988d2b2 MD |
1094 | } |
1095 | return error; | |
1096 | } | |
1097 | ||
ef665c1a | 1098 | void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1099 | { |
1100 | struct module_attribute *attr; | |
1101 | int i; | |
1102 | ||
03e88ae1 GKH |
1103 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1104 | /* pick a field to test for end of list */ | |
1105 | if (!attr->attr.name) | |
1106 | break; | |
c988d2b2 | 1107 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1108 | if (attr->free) |
1109 | attr->free(mod); | |
c988d2b2 | 1110 | } |
03e88ae1 | 1111 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1112 | } |
ef665c1a | 1113 | #endif |
1da177e4 | 1114 | |
ef665c1a RD |
1115 | #ifdef CONFIG_SYSFS |
1116 | int mod_sysfs_init(struct module *mod) | |
1da177e4 LT |
1117 | { |
1118 | int err; | |
1119 | ||
823bccfc GKH |
1120 | if (!module_sysfs_initialized) { |
1121 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1122 | mod->name); |
1123 | err = -EINVAL; | |
1124 | goto out; | |
1125 | } | |
1da177e4 LT |
1126 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1127 | err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name); | |
1128 | if (err) | |
1129 | goto out; | |
1130 | kobj_set_kset_s(&mod->mkobj, module_subsys); | |
1131 | mod->mkobj.mod = mod; | |
e17e0f51 | 1132 | |
e17e0f51 | 1133 | kobject_init(&mod->mkobj.kobj); |
270a6c4c KS |
1134 | |
1135 | out: | |
1136 | return err; | |
1137 | } | |
1138 | ||
ef665c1a | 1139 | int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1140 | struct kernel_param *kparam, |
1141 | unsigned int num_params) | |
1142 | { | |
1143 | int err; | |
1144 | ||
1145 | /* delay uevent until full sysfs population */ | |
e17e0f51 | 1146 | err = kobject_add(&mod->mkobj.kobj); |
1da177e4 LT |
1147 | if (err) |
1148 | goto out; | |
1149 | ||
270a6c4c | 1150 | mod->holders_dir = kobject_add_dir(&mod->mkobj.kobj, "holders"); |
240936e1 AM |
1151 | if (!mod->holders_dir) { |
1152 | err = -ENOMEM; | |
270a6c4c | 1153 | goto out_unreg; |
240936e1 | 1154 | } |
270a6c4c | 1155 | |
1da177e4 LT |
1156 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1157 | if (err) | |
270a6c4c | 1158 | goto out_unreg_holders; |
1da177e4 | 1159 | |
c988d2b2 MD |
1160 | err = module_add_modinfo_attrs(mod); |
1161 | if (err) | |
e17e0f51 | 1162 | goto out_unreg_param; |
c988d2b2 | 1163 | |
e17e0f51 | 1164 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1165 | return 0; |
1166 | ||
e17e0f51 KS |
1167 | out_unreg_param: |
1168 | module_param_sysfs_remove(mod); | |
270a6c4c KS |
1169 | out_unreg_holders: |
1170 | kobject_unregister(mod->holders_dir); | |
1171 | out_unreg: | |
e17e0f51 KS |
1172 | kobject_del(&mod->mkobj.kobj); |
1173 | kobject_put(&mod->mkobj.kobj); | |
1da177e4 LT |
1174 | out: |
1175 | return err; | |
1176 | } | |
ef665c1a | 1177 | #endif |
1da177e4 LT |
1178 | |
1179 | static void mod_kobject_remove(struct module *mod) | |
1180 | { | |
c988d2b2 | 1181 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1182 | module_param_sysfs_remove(mod); |
b92be9f1 MK |
1183 | kobject_unregister(mod->mkobj.drivers_dir); |
1184 | kobject_unregister(mod->holders_dir); | |
1da177e4 LT |
1185 | kobject_unregister(&mod->mkobj.kobj); |
1186 | } | |
1187 | ||
1188 | /* | |
1189 | * unlink the module with the whole machine is stopped with interrupts off | |
1190 | * - this defends against kallsyms not taking locks | |
1191 | */ | |
1192 | static int __unlink_module(void *_mod) | |
1193 | { | |
1194 | struct module *mod = _mod; | |
1195 | list_del(&mod->list); | |
1196 | return 0; | |
1197 | } | |
1198 | ||
02a3e59a | 1199 | /* Free a module, remove from lists, etc (must hold module_mutex). */ |
1da177e4 LT |
1200 | static void free_module(struct module *mod) |
1201 | { | |
1202 | /* Delete from various lists */ | |
1203 | stop_machine_run(__unlink_module, mod, NR_CPUS); | |
1204 | remove_sect_attrs(mod); | |
1205 | mod_kobject_remove(mod); | |
1206 | ||
4552d5dc JB |
1207 | unwind_remove_table(mod->unwind_info, 0); |
1208 | ||
1da177e4 LT |
1209 | /* Arch-specific cleanup. */ |
1210 | module_arch_cleanup(mod); | |
1211 | ||
1212 | /* Module unload stuff */ | |
1213 | module_unload_free(mod); | |
1214 | ||
1215 | /* This may be NULL, but that's OK */ | |
1216 | module_free(mod, mod->module_init); | |
1217 | kfree(mod->args); | |
1218 | if (mod->percpu) | |
1219 | percpu_modfree(mod->percpu); | |
1220 | ||
fbb9ce95 IM |
1221 | /* Free lock-classes: */ |
1222 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1223 | ||
1da177e4 LT |
1224 | /* Finally, free the core (containing the module structure) */ |
1225 | module_free(mod, mod->module_core); | |
1226 | } | |
1227 | ||
1228 | void *__symbol_get(const char *symbol) | |
1229 | { | |
1230 | struct module *owner; | |
1231 | unsigned long value, flags; | |
1232 | const unsigned long *crc; | |
1233 | ||
1234 | spin_lock_irqsave(&modlist_lock, flags); | |
1235 | value = __find_symbol(symbol, &owner, &crc, 1); | |
1236 | if (value && !strong_try_module_get(owner)) | |
1237 | value = 0; | |
1238 | spin_unlock_irqrestore(&modlist_lock, flags); | |
1239 | ||
1240 | return (void *)value; | |
1241 | } | |
1242 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1243 | ||
eea8b54d AN |
1244 | /* |
1245 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1246 | * in the kernel or in some other module's exported symbol table. |
eea8b54d AN |
1247 | */ |
1248 | static int verify_export_symbols(struct module *mod) | |
1249 | { | |
1250 | const char *name = NULL; | |
1251 | unsigned long i, ret = 0; | |
1252 | struct module *owner; | |
1253 | const unsigned long *crc; | |
1254 | ||
1255 | for (i = 0; i < mod->num_syms; i++) | |
1256 | if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) { | |
1257 | name = mod->syms[i].name; | |
1258 | ret = -ENOEXEC; | |
1259 | goto dup; | |
1260 | } | |
1261 | ||
1262 | for (i = 0; i < mod->num_gpl_syms; i++) | |
1263 | if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) { | |
1264 | name = mod->gpl_syms[i].name; | |
1265 | ret = -ENOEXEC; | |
1266 | goto dup; | |
1267 | } | |
1268 | ||
1269 | dup: | |
1270 | if (ret) | |
1271 | printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n", | |
1272 | mod->name, name, module_name(owner)); | |
1273 | ||
1274 | return ret; | |
1275 | } | |
1276 | ||
1da177e4 LT |
1277 | /* Change all symbols so that sh_value encodes the pointer directly. */ |
1278 | static int simplify_symbols(Elf_Shdr *sechdrs, | |
1279 | unsigned int symindex, | |
1280 | const char *strtab, | |
1281 | unsigned int versindex, | |
1282 | unsigned int pcpuindex, | |
1283 | struct module *mod) | |
1284 | { | |
1285 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1286 | unsigned long secbase; | |
1287 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1288 | int ret = 0; | |
1289 | ||
1290 | for (i = 1; i < n; i++) { | |
1291 | switch (sym[i].st_shndx) { | |
1292 | case SHN_COMMON: | |
1293 | /* We compiled with -fno-common. These are not | |
1294 | supposed to happen. */ | |
1295 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1296 | printk("%s: please compile with -fno-common\n", | |
1297 | mod->name); | |
1298 | ret = -ENOEXEC; | |
1299 | break; | |
1300 | ||
1301 | case SHN_ABS: | |
1302 | /* Don't need to do anything */ | |
1303 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1304 | (long)sym[i].st_value); | |
1305 | break; | |
1306 | ||
1307 | case SHN_UNDEF: | |
1308 | sym[i].st_value | |
1309 | = resolve_symbol(sechdrs, versindex, | |
1310 | strtab + sym[i].st_name, mod); | |
1311 | ||
1312 | /* Ok if resolved. */ | |
1313 | if (sym[i].st_value != 0) | |
1314 | break; | |
1315 | /* Ok if weak. */ | |
1316 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) | |
1317 | break; | |
1318 | ||
1319 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
1320 | mod->name, strtab + sym[i].st_name); | |
1321 | ret = -ENOENT; | |
1322 | break; | |
1323 | ||
1324 | default: | |
1325 | /* Divert to percpu allocation if a percpu var. */ | |
1326 | if (sym[i].st_shndx == pcpuindex) | |
1327 | secbase = (unsigned long)mod->percpu; | |
1328 | else | |
1329 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1330 | sym[i].st_value += secbase; | |
1331 | break; | |
1332 | } | |
1333 | } | |
1334 | ||
1335 | return ret; | |
1336 | } | |
1337 | ||
1338 | /* Update size with this section: return offset. */ | |
1339 | static long get_offset(unsigned long *size, Elf_Shdr *sechdr) | |
1340 | { | |
1341 | long ret; | |
1342 | ||
1343 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); | |
1344 | *size = ret + sechdr->sh_size; | |
1345 | return ret; | |
1346 | } | |
1347 | ||
1348 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1349 | might -- code, read-only data, read-write data, small data. Tally | |
1350 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1351 | belongs in init. */ | |
1352 | static void layout_sections(struct module *mod, | |
1353 | const Elf_Ehdr *hdr, | |
1354 | Elf_Shdr *sechdrs, | |
1355 | const char *secstrings) | |
1356 | { | |
1357 | static unsigned long const masks[][2] = { | |
1358 | /* NOTE: all executable code must be the first section | |
1359 | * in this array; otherwise modify the text_size | |
1360 | * finder in the two loops below */ | |
1361 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1362 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1363 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1364 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1365 | }; | |
1366 | unsigned int m, i; | |
1367 | ||
1368 | for (i = 0; i < hdr->e_shnum; i++) | |
1369 | sechdrs[i].sh_entsize = ~0UL; | |
1370 | ||
1371 | DEBUGP("Core section allocation order:\n"); | |
1372 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1373 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1374 | Elf_Shdr *s = &sechdrs[i]; | |
1375 | ||
1376 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1377 | || (s->sh_flags & masks[m][1]) | |
1378 | || s->sh_entsize != ~0UL | |
1379 | || strncmp(secstrings + s->sh_name, | |
1380 | ".init", 5) == 0) | |
1381 | continue; | |
1382 | s->sh_entsize = get_offset(&mod->core_size, s); | |
1383 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1384 | } | |
1385 | if (m == 0) | |
1386 | mod->core_text_size = mod->core_size; | |
1387 | } | |
1388 | ||
1389 | DEBUGP("Init section allocation order:\n"); | |
1390 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1391 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1392 | Elf_Shdr *s = &sechdrs[i]; | |
1393 | ||
1394 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1395 | || (s->sh_flags & masks[m][1]) | |
1396 | || s->sh_entsize != ~0UL | |
1397 | || strncmp(secstrings + s->sh_name, | |
1398 | ".init", 5) != 0) | |
1399 | continue; | |
1400 | s->sh_entsize = (get_offset(&mod->init_size, s) | |
1401 | | INIT_OFFSET_MASK); | |
1402 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1403 | } | |
1404 | if (m == 0) | |
1405 | mod->init_text_size = mod->init_size; | |
1406 | } | |
1407 | } | |
1408 | ||
1da177e4 LT |
1409 | static void set_license(struct module *mod, const char *license) |
1410 | { | |
1411 | if (!license) | |
1412 | license = "unspecified"; | |
1413 | ||
fa3ba2e8 FM |
1414 | if (!license_is_gpl_compatible(license)) { |
1415 | if (!(tainted & TAINT_PROPRIETARY_MODULE)) | |
1d4d2627 | 1416 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1417 | "kernel.\n", mod->name, license); |
1418 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1419 | } |
1420 | } | |
1421 | ||
1422 | /* Parse tag=value strings from .modinfo section */ | |
1423 | static char *next_string(char *string, unsigned long *secsize) | |
1424 | { | |
1425 | /* Skip non-zero chars */ | |
1426 | while (string[0]) { | |
1427 | string++; | |
1428 | if ((*secsize)-- <= 1) | |
1429 | return NULL; | |
1430 | } | |
1431 | ||
1432 | /* Skip any zero padding. */ | |
1433 | while (!string[0]) { | |
1434 | string++; | |
1435 | if ((*secsize)-- <= 1) | |
1436 | return NULL; | |
1437 | } | |
1438 | return string; | |
1439 | } | |
1440 | ||
1441 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1442 | unsigned int info, | |
1443 | const char *tag) | |
1444 | { | |
1445 | char *p; | |
1446 | unsigned int taglen = strlen(tag); | |
1447 | unsigned long size = sechdrs[info].sh_size; | |
1448 | ||
1449 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1450 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1451 | return p + taglen + 1; | |
1452 | } | |
1453 | return NULL; | |
1454 | } | |
1455 | ||
c988d2b2 MD |
1456 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1457 | unsigned int infoindex) | |
1458 | { | |
1459 | struct module_attribute *attr; | |
1460 | int i; | |
1461 | ||
1462 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1463 | if (attr->setup) | |
1464 | attr->setup(mod, | |
1465 | get_modinfo(sechdrs, | |
1466 | infoindex, | |
1467 | attr->attr.name)); | |
1468 | } | |
1469 | } | |
c988d2b2 | 1470 | |
1da177e4 | 1471 | #ifdef CONFIG_KALLSYMS |
ea07890a | 1472 | static int is_exported(const char *name, const struct module *mod) |
1da177e4 | 1473 | { |
3fd6805f SR |
1474 | if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) |
1475 | return 1; | |
1476 | else | |
f867d2a2 | 1477 | if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) |
1da177e4 | 1478 | return 1; |
3fd6805f SR |
1479 | else |
1480 | return 0; | |
1da177e4 LT |
1481 | } |
1482 | ||
1483 | /* As per nm */ | |
1484 | static char elf_type(const Elf_Sym *sym, | |
1485 | Elf_Shdr *sechdrs, | |
1486 | const char *secstrings, | |
1487 | struct module *mod) | |
1488 | { | |
1489 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1490 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1491 | return 'v'; | |
1492 | else | |
1493 | return 'w'; | |
1494 | } | |
1495 | if (sym->st_shndx == SHN_UNDEF) | |
1496 | return 'U'; | |
1497 | if (sym->st_shndx == SHN_ABS) | |
1498 | return 'a'; | |
1499 | if (sym->st_shndx >= SHN_LORESERVE) | |
1500 | return '?'; | |
1501 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1502 | return 't'; | |
1503 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1504 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1505 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1506 | return 'r'; | |
1507 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1508 | return 'g'; | |
1509 | else | |
1510 | return 'd'; | |
1511 | } | |
1512 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1513 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1514 | return 's'; | |
1515 | else | |
1516 | return 'b'; | |
1517 | } | |
1518 | if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, | |
1519 | ".debug", strlen(".debug")) == 0) | |
1520 | return 'n'; | |
1521 | return '?'; | |
1522 | } | |
1523 | ||
1524 | static void add_kallsyms(struct module *mod, | |
1525 | Elf_Shdr *sechdrs, | |
1526 | unsigned int symindex, | |
1527 | unsigned int strindex, | |
1528 | const char *secstrings) | |
1529 | { | |
1530 | unsigned int i; | |
1531 | ||
1532 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
1533 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1534 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
1535 | ||
1536 | /* Set types up while we still have access to sections. */ | |
1537 | for (i = 0; i < mod->num_symtab; i++) | |
1538 | mod->symtab[i].st_info | |
1539 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
1540 | } | |
1541 | #else | |
1542 | static inline void add_kallsyms(struct module *mod, | |
1543 | Elf_Shdr *sechdrs, | |
1544 | unsigned int symindex, | |
1545 | unsigned int strindex, | |
1546 | const char *secstrings) | |
1547 | { | |
1548 | } | |
1549 | #endif /* CONFIG_KALLSYMS */ | |
1550 | ||
1551 | /* Allocate and load the module: note that size of section 0 is always | |
1552 | zero, and we rely on this for optional sections. */ | |
1553 | static struct module *load_module(void __user *umod, | |
1554 | unsigned long len, | |
1555 | const char __user *uargs) | |
1556 | { | |
1557 | Elf_Ehdr *hdr; | |
1558 | Elf_Shdr *sechdrs; | |
1559 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
84860f99 AM |
1560 | unsigned int i; |
1561 | unsigned int symindex = 0; | |
1562 | unsigned int strindex = 0; | |
1563 | unsigned int setupindex; | |
1564 | unsigned int exindex; | |
1565 | unsigned int exportindex; | |
1566 | unsigned int modindex; | |
1567 | unsigned int obsparmindex; | |
1568 | unsigned int infoindex; | |
1569 | unsigned int gplindex; | |
1570 | unsigned int crcindex; | |
1571 | unsigned int gplcrcindex; | |
1572 | unsigned int versindex; | |
1573 | unsigned int pcpuindex; | |
1574 | unsigned int gplfutureindex; | |
1575 | unsigned int gplfuturecrcindex; | |
1576 | unsigned int unwindex = 0; | |
1577 | unsigned int unusedindex; | |
1578 | unsigned int unusedcrcindex; | |
1579 | unsigned int unusedgplindex; | |
1580 | unsigned int unusedgplcrcindex; | |
1da177e4 LT |
1581 | struct module *mod; |
1582 | long err = 0; | |
1583 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ | |
1584 | struct exception_table_entry *extable; | |
378bac82 | 1585 | mm_segment_t old_fs; |
1da177e4 LT |
1586 | |
1587 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
1588 | umod, len, uargs); | |
1589 | if (len < sizeof(*hdr)) | |
1590 | return ERR_PTR(-ENOEXEC); | |
1591 | ||
1592 | /* Suck in entire file: we'll want most of it. */ | |
1593 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
1594 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
1595 | return ERR_PTR(-ENOMEM); | |
1596 | if (copy_from_user(hdr, umod, len) != 0) { | |
1597 | err = -EFAULT; | |
1598 | goto free_hdr; | |
1599 | } | |
1600 | ||
1601 | /* Sanity checks against insmoding binaries or wrong arch, | |
1602 | weird elf version */ | |
1603 | if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 | |
1604 | || hdr->e_type != ET_REL | |
1605 | || !elf_check_arch(hdr) | |
1606 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
1607 | err = -ENOEXEC; | |
1608 | goto free_hdr; | |
1609 | } | |
1610 | ||
1611 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
1612 | goto truncated; | |
1613 | ||
1614 | /* Convenience variables */ | |
1615 | sechdrs = (void *)hdr + hdr->e_shoff; | |
1616 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
1617 | sechdrs[0].sh_addr = 0; | |
1618 | ||
1619 | for (i = 1; i < hdr->e_shnum; i++) { | |
1620 | if (sechdrs[i].sh_type != SHT_NOBITS | |
1621 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
1622 | goto truncated; | |
1623 | ||
1624 | /* Mark all sections sh_addr with their address in the | |
1625 | temporary image. */ | |
1626 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
1627 | ||
1628 | /* Internal symbols and strings. */ | |
1629 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
1630 | symindex = i; | |
1631 | strindex = sechdrs[i].sh_link; | |
1632 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
1633 | } | |
1634 | #ifndef CONFIG_MODULE_UNLOAD | |
1635 | /* Don't load .exit sections */ | |
1636 | if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) | |
1637 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1638 | #endif | |
1639 | } | |
1640 | ||
1641 | modindex = find_sec(hdr, sechdrs, secstrings, | |
1642 | ".gnu.linkonce.this_module"); | |
1643 | if (!modindex) { | |
1644 | printk(KERN_WARNING "No module found in object\n"); | |
1645 | err = -ENOEXEC; | |
1646 | goto free_hdr; | |
1647 | } | |
1648 | mod = (void *)sechdrs[modindex].sh_addr; | |
1649 | ||
1650 | if (symindex == 0) { | |
1651 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
1652 | mod->name); | |
1653 | err = -ENOEXEC; | |
1654 | goto free_hdr; | |
1655 | } | |
1656 | ||
1657 | /* Optional sections */ | |
1658 | exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); | |
1659 | gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); | |
9f28bb7e | 1660 | gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future"); |
f71d20e9 AV |
1661 | unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused"); |
1662 | unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl"); | |
1da177e4 LT |
1663 | crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); |
1664 | gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
9f28bb7e | 1665 | gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future"); |
f71d20e9 AV |
1666 | unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused"); |
1667 | unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl"); | |
1da177e4 LT |
1668 | setupindex = find_sec(hdr, sechdrs, secstrings, "__param"); |
1669 | exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table"); | |
1670 | obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm"); | |
1671 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); | |
1672 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
1673 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
4552d5dc JB |
1674 | #ifdef ARCH_UNWIND_SECTION_NAME |
1675 | unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME); | |
1676 | #endif | |
1da177e4 LT |
1677 | |
1678 | /* Don't keep modinfo section */ | |
1679 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1680 | #ifdef CONFIG_KALLSYMS | |
1681 | /* Keep symbol and string tables for decoding later. */ | |
1682 | sechdrs[symindex].sh_flags |= SHF_ALLOC; | |
1683 | sechdrs[strindex].sh_flags |= SHF_ALLOC; | |
1684 | #endif | |
4552d5dc JB |
1685 | if (unwindex) |
1686 | sechdrs[unwindex].sh_flags |= SHF_ALLOC; | |
1da177e4 LT |
1687 | |
1688 | /* Check module struct version now, before we try to use module. */ | |
1689 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
1690 | err = -ENOEXEC; | |
1691 | goto free_hdr; | |
1692 | } | |
1693 | ||
1694 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
1695 | /* This is allowed: modprobe --force will invalidate it. */ | |
1696 | if (!modmagic) { | |
fa3ba2e8 | 1697 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1da177e4 LT |
1698 | printk(KERN_WARNING "%s: no version magic, tainting kernel.\n", |
1699 | mod->name); | |
1700 | } else if (!same_magic(modmagic, vermagic)) { | |
1701 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", | |
1702 | mod->name, modmagic, vermagic); | |
1703 | err = -ENOEXEC; | |
1704 | goto free_hdr; | |
1705 | } | |
1706 | ||
1707 | /* Now copy in args */ | |
24277dda DA |
1708 | args = strndup_user(uargs, ~0UL >> 1); |
1709 | if (IS_ERR(args)) { | |
1710 | err = PTR_ERR(args); | |
1da177e4 LT |
1711 | goto free_hdr; |
1712 | } | |
8e08b756 | 1713 | |
1da177e4 LT |
1714 | if (find_module(mod->name)) { |
1715 | err = -EEXIST; | |
1716 | goto free_mod; | |
1717 | } | |
1718 | ||
1719 | mod->state = MODULE_STATE_COMING; | |
1720 | ||
1721 | /* Allow arches to frob section contents and sizes. */ | |
1722 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
1723 | if (err < 0) | |
1724 | goto free_mod; | |
1725 | ||
1726 | if (pcpuindex) { | |
1727 | /* We have a special allocation for this section. */ | |
1728 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, | |
842bbaaa RR |
1729 | sechdrs[pcpuindex].sh_addralign, |
1730 | mod->name); | |
1da177e4 LT |
1731 | if (!percpu) { |
1732 | err = -ENOMEM; | |
1733 | goto free_mod; | |
1734 | } | |
1735 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1736 | mod->percpu = percpu; | |
1737 | } | |
1738 | ||
1739 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
1740 | this is done generically; there doesn't appear to be any | |
1741 | special cases for the architectures. */ | |
1742 | layout_sections(mod, hdr, sechdrs, secstrings); | |
1743 | ||
1744 | /* Do the allocs. */ | |
1745 | ptr = module_alloc(mod->core_size); | |
1746 | if (!ptr) { | |
1747 | err = -ENOMEM; | |
1748 | goto free_percpu; | |
1749 | } | |
1750 | memset(ptr, 0, mod->core_size); | |
1751 | mod->module_core = ptr; | |
1752 | ||
1753 | ptr = module_alloc(mod->init_size); | |
1754 | if (!ptr && mod->init_size) { | |
1755 | err = -ENOMEM; | |
1756 | goto free_core; | |
1757 | } | |
1758 | memset(ptr, 0, mod->init_size); | |
1759 | mod->module_init = ptr; | |
1760 | ||
1761 | /* Transfer each section which specifies SHF_ALLOC */ | |
1762 | DEBUGP("final section addresses:\n"); | |
1763 | for (i = 0; i < hdr->e_shnum; i++) { | |
1764 | void *dest; | |
1765 | ||
1766 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1767 | continue; | |
1768 | ||
1769 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
1770 | dest = mod->module_init | |
1771 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
1772 | else | |
1773 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
1774 | ||
1775 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
1776 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
1777 | sechdrs[i].sh_size); | |
1778 | /* Update sh_addr to point to copy in image. */ | |
1779 | sechdrs[i].sh_addr = (unsigned long)dest; | |
1780 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
1781 | } | |
1782 | /* Module has been moved. */ | |
1783 | mod = (void *)sechdrs[modindex].sh_addr; | |
1784 | ||
1785 | /* Now we've moved module, initialize linked lists, etc. */ | |
1786 | module_unload_init(mod); | |
1787 | ||
270a6c4c KS |
1788 | /* Initialize kobject, so we can reference it. */ |
1789 | if (mod_sysfs_init(mod) != 0) | |
1790 | goto cleanup; | |
1791 | ||
1da177e4 LT |
1792 | /* Set up license info based on the info section */ |
1793 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
1794 | ||
fa3ba2e8 | 1795 | if (strcmp(mod->name, "ndiswrapper") == 0) |
0e2d57fc | 1796 | add_taint(TAINT_PROPRIETARY_MODULE); |
fa3ba2e8 FM |
1797 | if (strcmp(mod->name, "driverloader") == 0) |
1798 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
9841d61d | 1799 | |
c988d2b2 MD |
1800 | /* Set up MODINFO_ATTR fields */ |
1801 | setup_modinfo(mod, sechdrs, infoindex); | |
c988d2b2 | 1802 | |
1da177e4 LT |
1803 | /* Fix up syms, so that st_value is a pointer to location. */ |
1804 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
1805 | mod); | |
1806 | if (err < 0) | |
1807 | goto cleanup; | |
1808 | ||
1809 | /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ | |
1810 | mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms); | |
1811 | mod->syms = (void *)sechdrs[exportindex].sh_addr; | |
1812 | if (crcindex) | |
1813 | mod->crcs = (void *)sechdrs[crcindex].sh_addr; | |
1814 | mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms); | |
1815 | mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr; | |
1816 | if (gplcrcindex) | |
1817 | mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr; | |
9f28bb7e GKH |
1818 | mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size / |
1819 | sizeof(*mod->gpl_future_syms); | |
f71d20e9 AV |
1820 | mod->num_unused_syms = sechdrs[unusedindex].sh_size / |
1821 | sizeof(*mod->unused_syms); | |
1822 | mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size / | |
1823 | sizeof(*mod->unused_gpl_syms); | |
9f28bb7e GKH |
1824 | mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr; |
1825 | if (gplfuturecrcindex) | |
1826 | mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr; | |
1da177e4 | 1827 | |
f71d20e9 AV |
1828 | mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr; |
1829 | if (unusedcrcindex) | |
1830 | mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr; | |
1831 | mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr; | |
1832 | if (unusedgplcrcindex) | |
1833 | mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr; | |
1834 | ||
1da177e4 LT |
1835 | #ifdef CONFIG_MODVERSIONS |
1836 | if ((mod->num_syms && !crcindex) || | |
9f28bb7e | 1837 | (mod->num_gpl_syms && !gplcrcindex) || |
f71d20e9 AV |
1838 | (mod->num_gpl_future_syms && !gplfuturecrcindex) || |
1839 | (mod->num_unused_syms && !unusedcrcindex) || | |
1840 | (mod->num_unused_gpl_syms && !unusedgplcrcindex)) { | |
1da177e4 LT |
1841 | printk(KERN_WARNING "%s: No versions for exported symbols." |
1842 | " Tainting kernel.\n", mod->name); | |
fa3ba2e8 | 1843 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1da177e4 LT |
1844 | } |
1845 | #endif | |
1846 | ||
1847 | /* Now do relocations. */ | |
1848 | for (i = 1; i < hdr->e_shnum; i++) { | |
1849 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
1850 | unsigned int info = sechdrs[i].sh_info; | |
1851 | ||
1852 | /* Not a valid relocation section? */ | |
1853 | if (info >= hdr->e_shnum) | |
1854 | continue; | |
1855 | ||
1856 | /* Don't bother with non-allocated sections */ | |
1857 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
1858 | continue; | |
1859 | ||
1860 | if (sechdrs[i].sh_type == SHT_REL) | |
1861 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
1862 | else if (sechdrs[i].sh_type == SHT_RELA) | |
1863 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
1864 | mod); | |
1865 | if (err < 0) | |
1866 | goto cleanup; | |
1867 | } | |
1868 | ||
eea8b54d AN |
1869 | /* Find duplicate symbols */ |
1870 | err = verify_export_symbols(mod); | |
1871 | ||
1872 | if (err < 0) | |
1873 | goto cleanup; | |
1874 | ||
1da177e4 LT |
1875 | /* Set up and sort exception table */ |
1876 | mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable); | |
1877 | mod->extable = extable = (void *)sechdrs[exindex].sh_addr; | |
1878 | sort_extable(extable, extable + mod->num_exentries); | |
1879 | ||
1880 | /* Finally, copy percpu area over. */ | |
1881 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, | |
1882 | sechdrs[pcpuindex].sh_size); | |
1883 | ||
1884 | add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); | |
1885 | ||
1886 | err = module_finalize(hdr, sechdrs, mod); | |
1887 | if (err < 0) | |
1888 | goto cleanup; | |
1889 | ||
378bac82 TK |
1890 | /* flush the icache in correct context */ |
1891 | old_fs = get_fs(); | |
1892 | set_fs(KERNEL_DS); | |
1893 | ||
1894 | /* | |
1895 | * Flush the instruction cache, since we've played with text. | |
1896 | * Do it before processing of module parameters, so the module | |
1897 | * can provide parameter accessor functions of its own. | |
1898 | */ | |
1899 | if (mod->module_init) | |
1900 | flush_icache_range((unsigned long)mod->module_init, | |
1901 | (unsigned long)mod->module_init | |
1902 | + mod->init_size); | |
1903 | flush_icache_range((unsigned long)mod->module_core, | |
1904 | (unsigned long)mod->module_core + mod->core_size); | |
1905 | ||
1906 | set_fs(old_fs); | |
1907 | ||
1da177e4 | 1908 | mod->args = args; |
8d3b33f6 RR |
1909 | if (obsparmindex) |
1910 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", | |
1911 | mod->name); | |
1912 | ||
1913 | /* Size of section 0 is 0, so this works well if no params */ | |
1914 | err = parse_args(mod->name, mod->args, | |
1915 | (struct kernel_param *) | |
1916 | sechdrs[setupindex].sh_addr, | |
1917 | sechdrs[setupindex].sh_size | |
1918 | / sizeof(struct kernel_param), | |
1919 | NULL); | |
1da177e4 LT |
1920 | if (err < 0) |
1921 | goto arch_cleanup; | |
1922 | ||
1923 | err = mod_sysfs_setup(mod, | |
1924 | (struct kernel_param *) | |
1925 | sechdrs[setupindex].sh_addr, | |
1926 | sechdrs[setupindex].sh_size | |
1927 | / sizeof(struct kernel_param)); | |
1928 | if (err < 0) | |
1929 | goto arch_cleanup; | |
1930 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); | |
1931 | ||
4552d5dc JB |
1932 | /* Size of section 0 is 0, so this works well if no unwind info. */ |
1933 | mod->unwind_info = unwind_add_table(mod, | |
1934 | (void *)sechdrs[unwindex].sh_addr, | |
1935 | sechdrs[unwindex].sh_size); | |
1936 | ||
1da177e4 LT |
1937 | /* Get rid of temporary copy */ |
1938 | vfree(hdr); | |
1939 | ||
1940 | /* Done! */ | |
1941 | return mod; | |
1942 | ||
1943 | arch_cleanup: | |
1944 | module_arch_cleanup(mod); | |
1945 | cleanup: | |
1946 | module_unload_free(mod); | |
1947 | module_free(mod, mod->module_init); | |
1948 | free_core: | |
1949 | module_free(mod, mod->module_core); | |
1950 | free_percpu: | |
1951 | if (percpu) | |
1952 | percpu_modfree(percpu); | |
1953 | free_mod: | |
1954 | kfree(args); | |
1955 | free_hdr: | |
1956 | vfree(hdr); | |
6fe2e70b | 1957 | return ERR_PTR(err); |
1da177e4 LT |
1958 | |
1959 | truncated: | |
1960 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
1961 | err = -ENOEXEC; | |
1962 | goto free_hdr; | |
1963 | } | |
1964 | ||
1965 | /* | |
1966 | * link the module with the whole machine is stopped with interrupts off | |
1967 | * - this defends against kallsyms not taking locks | |
1968 | */ | |
1969 | static int __link_module(void *_mod) | |
1970 | { | |
1971 | struct module *mod = _mod; | |
1972 | list_add(&mod->list, &modules); | |
1973 | return 0; | |
1974 | } | |
1975 | ||
1976 | /* This is where the real work happens */ | |
1977 | asmlinkage long | |
1978 | sys_init_module(void __user *umod, | |
1979 | unsigned long len, | |
1980 | const char __user *uargs) | |
1981 | { | |
1982 | struct module *mod; | |
1983 | int ret = 0; | |
1984 | ||
1985 | /* Must have permission */ | |
1986 | if (!capable(CAP_SYS_MODULE)) | |
1987 | return -EPERM; | |
1988 | ||
1989 | /* Only one module load at a time, please */ | |
6389a385 | 1990 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
1991 | return -EINTR; |
1992 | ||
1993 | /* Do all the hard work */ | |
1994 | mod = load_module(umod, len, uargs); | |
1995 | if (IS_ERR(mod)) { | |
6389a385 | 1996 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1997 | return PTR_ERR(mod); |
1998 | } | |
1999 | ||
1da177e4 LT |
2000 | /* Now sew it into the lists. They won't access us, since |
2001 | strong_try_module_get() will fail. */ | |
2002 | stop_machine_run(__link_module, mod, NR_CPUS); | |
2003 | ||
2004 | /* Drop lock so they can recurse */ | |
6389a385 | 2005 | mutex_unlock(&module_mutex); |
1da177e4 | 2006 | |
e041c683 AS |
2007 | blocking_notifier_call_chain(&module_notify_list, |
2008 | MODULE_STATE_COMING, mod); | |
1da177e4 LT |
2009 | |
2010 | /* Start the module */ | |
2011 | if (mod->init != NULL) | |
2012 | ret = mod->init(); | |
2013 | if (ret < 0) { | |
2014 | /* Init routine failed: abort. Try to protect us from | |
2015 | buggy refcounters. */ | |
2016 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2017 | synchronize_sched(); |
1da177e4 LT |
2018 | if (mod->unsafe) |
2019 | printk(KERN_ERR "%s: module is now stuck!\n", | |
2020 | mod->name); | |
2021 | else { | |
2022 | module_put(mod); | |
6389a385 | 2023 | mutex_lock(&module_mutex); |
1da177e4 | 2024 | free_module(mod); |
6389a385 | 2025 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2026 | } |
2027 | return ret; | |
2028 | } | |
2029 | ||
2030 | /* Now it's a first class citizen! */ | |
6389a385 | 2031 | mutex_lock(&module_mutex); |
1da177e4 LT |
2032 | mod->state = MODULE_STATE_LIVE; |
2033 | /* Drop initial reference. */ | |
2034 | module_put(mod); | |
4552d5dc | 2035 | unwind_remove_table(mod->unwind_info, 1); |
1da177e4 LT |
2036 | module_free(mod, mod->module_init); |
2037 | mod->module_init = NULL; | |
2038 | mod->init_size = 0; | |
2039 | mod->init_text_size = 0; | |
6389a385 | 2040 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2041 | |
2042 | return 0; | |
2043 | } | |
2044 | ||
2045 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2046 | { | |
2047 | return ((void *)addr >= start && (void *)addr < start + size); | |
2048 | } | |
2049 | ||
2050 | #ifdef CONFIG_KALLSYMS | |
2051 | /* | |
2052 | * This ignores the intensely annoying "mapping symbols" found | |
2053 | * in ARM ELF files: $a, $t and $d. | |
2054 | */ | |
2055 | static inline int is_arm_mapping_symbol(const char *str) | |
2056 | { | |
2057 | return str[0] == '$' && strchr("atd", str[1]) | |
2058 | && (str[2] == '\0' || str[2] == '.'); | |
2059 | } | |
2060 | ||
2061 | static const char *get_ksymbol(struct module *mod, | |
2062 | unsigned long addr, | |
2063 | unsigned long *size, | |
2064 | unsigned long *offset) | |
2065 | { | |
2066 | unsigned int i, best = 0; | |
2067 | unsigned long nextval; | |
2068 | ||
2069 | /* At worse, next value is at end of module */ | |
2070 | if (within(addr, mod->module_init, mod->init_size)) | |
2071 | nextval = (unsigned long)mod->module_init+mod->init_text_size; | |
2072 | else | |
2073 | nextval = (unsigned long)mod->module_core+mod->core_text_size; | |
2074 | ||
2075 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
2076 | starts real symbols at 1). */ | |
2077 | for (i = 1; i < mod->num_symtab; i++) { | |
2078 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2079 | continue; | |
2080 | ||
2081 | /* We ignore unnamed symbols: they're uninformative | |
2082 | * and inserted at a whim. */ | |
2083 | if (mod->symtab[i].st_value <= addr | |
2084 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2085 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2086 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2087 | best = i; | |
2088 | if (mod->symtab[i].st_value > addr | |
2089 | && mod->symtab[i].st_value < nextval | |
2090 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2091 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2092 | nextval = mod->symtab[i].st_value; | |
2093 | } | |
2094 | ||
2095 | if (!best) | |
2096 | return NULL; | |
2097 | ||
ffb45122 AD |
2098 | if (size) |
2099 | *size = nextval - mod->symtab[best].st_value; | |
2100 | if (offset) | |
2101 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2102 | return mod->strtab + mod->symtab[best].st_name; |
2103 | } | |
2104 | ||
2105 | /* For kallsyms to ask for address resolution. NULL means not found. | |
2106 | We don't lock, as this is used for oops resolution and races are a | |
2107 | lesser concern. */ | |
2108 | const char *module_address_lookup(unsigned long addr, | |
2109 | unsigned long *size, | |
2110 | unsigned long *offset, | |
2111 | char **modname) | |
2112 | { | |
2113 | struct module *mod; | |
2114 | ||
2115 | list_for_each_entry(mod, &modules, list) { | |
2116 | if (within(addr, mod->module_init, mod->init_size) | |
2117 | || within(addr, mod->module_core, mod->core_size)) { | |
ffc50891 FBH |
2118 | if (modname) |
2119 | *modname = mod->name; | |
1da177e4 LT |
2120 | return get_ksymbol(mod, addr, size, offset); |
2121 | } | |
2122 | } | |
2123 | return NULL; | |
2124 | } | |
2125 | ||
9d65cb4a AD |
2126 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2127 | { | |
2128 | struct module *mod; | |
2129 | ||
2130 | mutex_lock(&module_mutex); | |
2131 | list_for_each_entry(mod, &modules, list) { | |
2132 | if (within(addr, mod->module_init, mod->init_size) || | |
2133 | within(addr, mod->module_core, mod->core_size)) { | |
2134 | const char *sym; | |
2135 | ||
2136 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2137 | if (!sym) | |
2138 | goto out; | |
2139 | strlcpy(symname, sym, KSYM_NAME_LEN + 1); | |
2140 | mutex_unlock(&module_mutex); | |
2141 | return 0; | |
2142 | } | |
2143 | } | |
2144 | out: | |
2145 | mutex_unlock(&module_mutex); | |
2146 | return -ERANGE; | |
2147 | } | |
2148 | ||
a5c43dae AD |
2149 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2150 | unsigned long *offset, char *modname, char *name) | |
2151 | { | |
2152 | struct module *mod; | |
2153 | ||
2154 | mutex_lock(&module_mutex); | |
2155 | list_for_each_entry(mod, &modules, list) { | |
2156 | if (within(addr, mod->module_init, mod->init_size) || | |
2157 | within(addr, mod->module_core, mod->core_size)) { | |
2158 | const char *sym; | |
2159 | ||
2160 | sym = get_ksymbol(mod, addr, size, offset); | |
2161 | if (!sym) | |
2162 | goto out; | |
2163 | if (modname) | |
2164 | strlcpy(modname, mod->name, MODULE_NAME_LEN + 1); | |
2165 | if (name) | |
2166 | strlcpy(name, sym, KSYM_NAME_LEN + 1); | |
2167 | mutex_unlock(&module_mutex); | |
2168 | return 0; | |
2169 | } | |
2170 | } | |
2171 | out: | |
2172 | mutex_unlock(&module_mutex); | |
2173 | return -ERANGE; | |
2174 | } | |
2175 | ||
ea07890a AD |
2176 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2177 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2178 | { |
2179 | struct module *mod; | |
2180 | ||
6389a385 | 2181 | mutex_lock(&module_mutex); |
1da177e4 LT |
2182 | list_for_each_entry(mod, &modules, list) { |
2183 | if (symnum < mod->num_symtab) { | |
2184 | *value = mod->symtab[symnum].st_value; | |
2185 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2186 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
ae84e324 | 2187 | KSYM_NAME_LEN + 1); |
ea07890a AD |
2188 | strlcpy(module_name, mod->name, MODULE_NAME_LEN + 1); |
2189 | *exported = is_exported(name, mod); | |
6389a385 | 2190 | mutex_unlock(&module_mutex); |
ea07890a | 2191 | return 0; |
1da177e4 LT |
2192 | } |
2193 | symnum -= mod->num_symtab; | |
2194 | } | |
6389a385 | 2195 | mutex_unlock(&module_mutex); |
ea07890a | 2196 | return -ERANGE; |
1da177e4 LT |
2197 | } |
2198 | ||
2199 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2200 | { | |
2201 | unsigned int i; | |
2202 | ||
2203 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2204 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2205 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2206 | return mod->symtab[i].st_value; |
2207 | return 0; | |
2208 | } | |
2209 | ||
2210 | /* Look for this name: can be of form module:name. */ | |
2211 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2212 | { | |
2213 | struct module *mod; | |
2214 | char *colon; | |
2215 | unsigned long ret = 0; | |
2216 | ||
2217 | /* Don't lock: we're in enough trouble already. */ | |
2218 | if ((colon = strchr(name, ':')) != NULL) { | |
2219 | *colon = '\0'; | |
2220 | if ((mod = find_module(name)) != NULL) | |
2221 | ret = mod_find_symname(mod, colon+1); | |
2222 | *colon = ':'; | |
2223 | } else { | |
2224 | list_for_each_entry(mod, &modules, list) | |
2225 | if ((ret = mod_find_symname(mod, name)) != 0) | |
2226 | break; | |
2227 | } | |
2228 | return ret; | |
2229 | } | |
2230 | #endif /* CONFIG_KALLSYMS */ | |
2231 | ||
2232 | /* Called by the /proc file system to return a list of modules. */ | |
2233 | static void *m_start(struct seq_file *m, loff_t *pos) | |
2234 | { | |
2235 | struct list_head *i; | |
2236 | loff_t n = 0; | |
2237 | ||
6389a385 | 2238 | mutex_lock(&module_mutex); |
1da177e4 LT |
2239 | list_for_each(i, &modules) { |
2240 | if (n++ == *pos) | |
2241 | break; | |
2242 | } | |
2243 | if (i == &modules) | |
2244 | return NULL; | |
2245 | return i; | |
2246 | } | |
2247 | ||
2248 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
2249 | { | |
2250 | struct list_head *i = p; | |
2251 | (*pos)++; | |
2252 | if (i->next == &modules) | |
2253 | return NULL; | |
2254 | return i->next; | |
2255 | } | |
2256 | ||
2257 | static void m_stop(struct seq_file *m, void *p) | |
2258 | { | |
6389a385 | 2259 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2260 | } |
2261 | ||
fa3ba2e8 FM |
2262 | static char *taint_flags(unsigned int taints, char *buf) |
2263 | { | |
2264 | int bx = 0; | |
2265 | ||
2266 | if (taints) { | |
2267 | buf[bx++] = '('; | |
2268 | if (taints & TAINT_PROPRIETARY_MODULE) | |
2269 | buf[bx++] = 'P'; | |
2270 | if (taints & TAINT_FORCED_MODULE) | |
2271 | buf[bx++] = 'F'; | |
2272 | /* | |
2273 | * TAINT_FORCED_RMMOD: could be added. | |
2274 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
2275 | * apply to modules. | |
2276 | */ | |
2277 | buf[bx++] = ')'; | |
2278 | } | |
2279 | buf[bx] = '\0'; | |
2280 | ||
2281 | return buf; | |
2282 | } | |
2283 | ||
1da177e4 LT |
2284 | static int m_show(struct seq_file *m, void *p) |
2285 | { | |
2286 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
2287 | char buf[8]; |
2288 | ||
1da177e4 LT |
2289 | seq_printf(m, "%s %lu", |
2290 | mod->name, mod->init_size + mod->core_size); | |
2291 | print_unload_info(m, mod); | |
2292 | ||
2293 | /* Informative for users. */ | |
2294 | seq_printf(m, " %s", | |
2295 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2296 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2297 | "Live"); | |
2298 | /* Used by oprofile and other similar tools. */ | |
2299 | seq_printf(m, " 0x%p", mod->module_core); | |
2300 | ||
fa3ba2e8 FM |
2301 | /* Taints info */ |
2302 | if (mod->taints) | |
2303 | seq_printf(m, " %s", taint_flags(mod->taints, buf)); | |
2304 | ||
1da177e4 LT |
2305 | seq_printf(m, "\n"); |
2306 | return 0; | |
2307 | } | |
2308 | ||
2309 | /* Format: modulename size refcount deps address | |
2310 | ||
2311 | Where refcount is a number or -, and deps is a comma-separated list | |
2312 | of depends or -. | |
2313 | */ | |
15ad7cdc | 2314 | const struct seq_operations modules_op = { |
1da177e4 LT |
2315 | .start = m_start, |
2316 | .next = m_next, | |
2317 | .stop = m_stop, | |
2318 | .show = m_show | |
2319 | }; | |
2320 | ||
2321 | /* Given an address, look for it in the module exception tables. */ | |
2322 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2323 | { | |
2324 | unsigned long flags; | |
2325 | const struct exception_table_entry *e = NULL; | |
2326 | struct module *mod; | |
2327 | ||
2328 | spin_lock_irqsave(&modlist_lock, flags); | |
2329 | list_for_each_entry(mod, &modules, list) { | |
2330 | if (mod->num_exentries == 0) | |
2331 | continue; | |
2332 | ||
2333 | e = search_extable(mod->extable, | |
2334 | mod->extable + mod->num_exentries - 1, | |
2335 | addr); | |
2336 | if (e) | |
2337 | break; | |
2338 | } | |
2339 | spin_unlock_irqrestore(&modlist_lock, flags); | |
2340 | ||
2341 | /* Now, if we found one, we are running inside it now, hence | |
2342 | we cannot unload the module, hence no refcnt needed. */ | |
2343 | return e; | |
2344 | } | |
2345 | ||
4d435f9d IM |
2346 | /* |
2347 | * Is this a valid module address? | |
2348 | */ | |
2349 | int is_module_address(unsigned long addr) | |
2350 | { | |
2351 | unsigned long flags; | |
2352 | struct module *mod; | |
2353 | ||
2354 | spin_lock_irqsave(&modlist_lock, flags); | |
2355 | ||
2356 | list_for_each_entry(mod, &modules, list) { | |
2357 | if (within(addr, mod->module_core, mod->core_size)) { | |
2358 | spin_unlock_irqrestore(&modlist_lock, flags); | |
2359 | return 1; | |
2360 | } | |
2361 | } | |
2362 | ||
2363 | spin_unlock_irqrestore(&modlist_lock, flags); | |
2364 | ||
2365 | return 0; | |
2366 | } | |
2367 | ||
2368 | ||
1da177e4 LT |
2369 | /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */ |
2370 | struct module *__module_text_address(unsigned long addr) | |
2371 | { | |
2372 | struct module *mod; | |
2373 | ||
2374 | list_for_each_entry(mod, &modules, list) | |
2375 | if (within(addr, mod->module_init, mod->init_text_size) | |
2376 | || within(addr, mod->module_core, mod->core_text_size)) | |
2377 | return mod; | |
2378 | return NULL; | |
2379 | } | |
2380 | ||
2381 | struct module *module_text_address(unsigned long addr) | |
2382 | { | |
2383 | struct module *mod; | |
2384 | unsigned long flags; | |
2385 | ||
2386 | spin_lock_irqsave(&modlist_lock, flags); | |
2387 | mod = __module_text_address(addr); | |
2388 | spin_unlock_irqrestore(&modlist_lock, flags); | |
2389 | ||
2390 | return mod; | |
2391 | } | |
2392 | ||
2393 | /* Don't grab lock, we're oopsing. */ | |
2394 | void print_modules(void) | |
2395 | { | |
2396 | struct module *mod; | |
2bc2d61a | 2397 | char buf[8]; |
1da177e4 LT |
2398 | |
2399 | printk("Modules linked in:"); | |
2400 | list_for_each_entry(mod, &modules, list) | |
2bc2d61a | 2401 | printk(" %s%s", mod->name, taint_flags(mod->taints, buf)); |
1da177e4 LT |
2402 | printk("\n"); |
2403 | } | |
2404 | ||
ef665c1a | 2405 | #ifdef CONFIG_SYSFS |
7f422e2e KS |
2406 | static char *make_driver_name(struct device_driver *drv) |
2407 | { | |
2408 | char *driver_name; | |
2409 | ||
2410 | driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2, | |
2411 | GFP_KERNEL); | |
2412 | if (!driver_name) | |
2413 | return NULL; | |
2414 | ||
2415 | sprintf(driver_name, "%s:%s", drv->bus->name, drv->name); | |
2416 | return driver_name; | |
2417 | } | |
2418 | ||
fe480a26 GKH |
2419 | static void module_create_drivers_dir(struct module_kobject *mk) |
2420 | { | |
2421 | if (!mk || mk->drivers_dir) | |
2422 | return; | |
2423 | ||
2424 | mk->drivers_dir = kobject_add_dir(&mk->kobj, "drivers"); | |
2425 | } | |
2426 | ||
1da177e4 LT |
2427 | void module_add_driver(struct module *mod, struct device_driver *drv) |
2428 | { | |
7f422e2e | 2429 | char *driver_name; |
e17e0f51 | 2430 | int no_warn; |
f30c53a8 | 2431 | struct module_kobject *mk = NULL; |
e17e0f51 | 2432 | |
f30c53a8 KS |
2433 | if (!drv) |
2434 | return; | |
2435 | ||
2436 | if (mod) | |
2437 | mk = &mod->mkobj; | |
2438 | else if (drv->mod_name) { | |
2439 | struct kobject *mkobj; | |
2440 | ||
2441 | /* Lookup built-in module entry in /sys/modules */ | |
823bccfc | 2442 | mkobj = kset_find_obj(&module_subsys, drv->mod_name); |
0c84ce26 | 2443 | if (mkobj) { |
f30c53a8 | 2444 | mk = container_of(mkobj, struct module_kobject, kobj); |
0c84ce26 KS |
2445 | /* remember our module structure */ |
2446 | drv->mkobj = mk; | |
2447 | /* kset_find_obj took a reference */ | |
2448 | kobject_put(mkobj); | |
2449 | } | |
f30c53a8 KS |
2450 | } |
2451 | ||
2452 | if (!mk) | |
1da177e4 LT |
2453 | return; |
2454 | ||
e17e0f51 | 2455 | /* Don't check return codes; these calls are idempotent */ |
f30c53a8 | 2456 | no_warn = sysfs_create_link(&drv->kobj, &mk->kobj, "module"); |
7f422e2e KS |
2457 | driver_name = make_driver_name(drv); |
2458 | if (driver_name) { | |
fe480a26 | 2459 | module_create_drivers_dir(mk); |
f30c53a8 | 2460 | no_warn = sysfs_create_link(mk->drivers_dir, &drv->kobj, |
7f422e2e KS |
2461 | driver_name); |
2462 | kfree(driver_name); | |
2463 | } | |
1da177e4 LT |
2464 | } |
2465 | EXPORT_SYMBOL(module_add_driver); | |
2466 | ||
2467 | void module_remove_driver(struct device_driver *drv) | |
2468 | { | |
0c84ce26 | 2469 | struct module_kobject *mk = NULL; |
7f422e2e KS |
2470 | char *driver_name; |
2471 | ||
1da177e4 LT |
2472 | if (!drv) |
2473 | return; | |
7f422e2e | 2474 | |
1da177e4 | 2475 | sysfs_remove_link(&drv->kobj, "module"); |
0c84ce26 KS |
2476 | |
2477 | if (drv->owner) | |
2478 | mk = &drv->owner->mkobj; | |
2479 | else if (drv->mkobj) | |
2480 | mk = drv->mkobj; | |
2481 | if (mk && mk->drivers_dir) { | |
7f422e2e KS |
2482 | driver_name = make_driver_name(drv); |
2483 | if (driver_name) { | |
0c84ce26 | 2484 | sysfs_remove_link(mk->drivers_dir, driver_name); |
7f422e2e KS |
2485 | kfree(driver_name); |
2486 | } | |
2487 | } | |
1da177e4 LT |
2488 | } |
2489 | EXPORT_SYMBOL(module_remove_driver); | |
ef665c1a | 2490 | #endif |
1da177e4 LT |
2491 | |
2492 | #ifdef CONFIG_MODVERSIONS | |
2493 | /* Generate the signature for struct module here, too, for modversions. */ | |
2494 | void struct_module(struct module *mod) { return; } | |
2495 | EXPORT_SYMBOL(struct_module); | |
2496 | #endif |