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> |
6d760133 | 23 | #include <linux/sysfs.h> |
9f158333 | 24 | #include <linux/kernel.h> |
1da177e4 LT |
25 | #include <linux/slab.h> |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/elf.h> | |
28 | #include <linux/seq_file.h> | |
29 | #include <linux/syscalls.h> | |
30 | #include <linux/fcntl.h> | |
31 | #include <linux/rcupdate.h> | |
c59ede7b | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/cpu.h> |
34 | #include <linux/moduleparam.h> | |
35 | #include <linux/errno.h> | |
36 | #include <linux/err.h> | |
37 | #include <linux/vermagic.h> | |
38 | #include <linux/notifier.h> | |
f6a57033 | 39 | #include <linux/sched.h> |
1da177e4 LT |
40 | #include <linux/stop_machine.h> |
41 | #include <linux/device.h> | |
c988d2b2 | 42 | #include <linux/string.h> |
97d1f15b | 43 | #include <linux/mutex.h> |
4552d5dc | 44 | #include <linux/unwind.h> |
1da177e4 | 45 | #include <asm/uaccess.h> |
1da177e4 | 46 | #include <asm/cacheflush.h> |
b817f6fe | 47 | #include <linux/license.h> |
6d762394 | 48 | #include <asm/sections.h> |
1da177e4 LT |
49 | |
50 | #if 0 | |
51 | #define DEBUGP printk | |
52 | #else | |
53 | #define DEBUGP(fmt , a...) | |
54 | #endif | |
55 | ||
56 | #ifndef ARCH_SHF_SMALL | |
57 | #define ARCH_SHF_SMALL 0 | |
58 | #endif | |
59 | ||
60 | /* If this is set, the section belongs in the init part of the module */ | |
61 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
62 | ||
24da1cbf RR |
63 | /* List of modules, protected by module_mutex or preempt_disable |
64 | * (add/delete uses stop_machine). */ | |
6389a385 | 65 | static DEFINE_MUTEX(module_mutex); |
1da177e4 LT |
66 | static LIST_HEAD(modules); |
67 | ||
c9a3ba55 RR |
68 | /* Waiting for a module to finish initializing? */ |
69 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
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 | ||
9a4b9708 ML |
85 | /* We require a truly strong try_module_get(): 0 means failure due to |
86 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
87 | static inline int strong_try_module_get(struct module *mod) |
88 | { | |
89 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
90 | return -EBUSY; |
91 | if (try_module_get(mod)) | |
1da177e4 | 92 | return 0; |
c9a3ba55 RR |
93 | else |
94 | return -ENOENT; | |
1da177e4 LT |
95 | } |
96 | ||
fa3ba2e8 FM |
97 | static inline void add_taint_module(struct module *mod, unsigned flag) |
98 | { | |
99 | add_taint(flag); | |
100 | mod->taints |= flag; | |
101 | } | |
102 | ||
02a3e59a RD |
103 | /* |
104 | * A thread that wants to hold a reference to a module only while it | |
105 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
106 | */ |
107 | void __module_put_and_exit(struct module *mod, long code) | |
108 | { | |
109 | module_put(mod); | |
110 | do_exit(code); | |
111 | } | |
112 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 113 | |
1da177e4 LT |
114 | /* Find a module section: 0 means not found. */ |
115 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
116 | Elf_Shdr *sechdrs, | |
117 | const char *secstrings, | |
118 | const char *name) | |
119 | { | |
120 | unsigned int i; | |
121 | ||
122 | for (i = 1; i < hdr->e_shnum; i++) | |
123 | /* Alloc bit cleared means "ignore it." */ | |
124 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
125 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
126 | return i; | |
127 | return 0; | |
128 | } | |
129 | ||
130 | /* Provided by the linker */ | |
131 | extern const struct kernel_symbol __start___ksymtab[]; | |
132 | extern const struct kernel_symbol __stop___ksymtab[]; | |
133 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
134 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
135 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
136 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
f71d20e9 AV |
137 | extern const struct kernel_symbol __start___ksymtab_unused[]; |
138 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
139 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
140 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
141 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; | |
142 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
143 | extern const unsigned long __start___kcrctab[]; |
144 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 145 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f71d20e9 AV |
146 | extern const unsigned long __start___kcrctab_unused[]; |
147 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
1da177e4 LT |
148 | |
149 | #ifndef CONFIG_MODVERSIONS | |
150 | #define symversion(base, idx) NULL | |
151 | #else | |
f83ca9fe | 152 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
153 | #endif |
154 | ||
3fd6805f SR |
155 | /* lookup symbol in given range of kernel_symbols */ |
156 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
157 | const struct kernel_symbol *start, | |
158 | const struct kernel_symbol *stop) | |
159 | { | |
160 | const struct kernel_symbol *ks = start; | |
161 | for (; ks < stop; ks++) | |
162 | if (strcmp(ks->name, name) == 0) | |
163 | return ks; | |
164 | return NULL; | |
165 | } | |
166 | ||
ad9546c9 | 167 | static bool always_ok(bool gplok, bool warn, const char *name) |
f71d20e9 | 168 | { |
ad9546c9 | 169 | return true; |
f71d20e9 AV |
170 | } |
171 | ||
ad9546c9 | 172 | static bool printk_unused_warning(bool gplok, bool warn, const char *name) |
1da177e4 | 173 | { |
ad9546c9 RR |
174 | if (warn) { |
175 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
176 | "however this module is using it.\n", name); | |
177 | printk(KERN_WARNING | |
178 | "This symbol will go away in the future.\n"); | |
179 | printk(KERN_WARNING | |
180 | "Please evalute if this is the right api to use and if " | |
181 | "it really is, submit a report the linux kernel " | |
182 | "mailinglist together with submitting your code for " | |
183 | "inclusion.\n"); | |
1da177e4 | 184 | } |
ad9546c9 RR |
185 | return true; |
186 | } | |
187 | ||
188 | static bool gpl_only_unused_warning(bool gplok, bool warn, const char *name) | |
189 | { | |
190 | if (!gplok) | |
191 | return false; | |
192 | return printk_unused_warning(gplok, warn, name); | |
193 | } | |
194 | ||
195 | static bool gpl_only(bool gplok, bool warn, const char *name) | |
196 | { | |
197 | return gplok; | |
198 | } | |
199 | ||
200 | static bool warn_if_not_gpl(bool gplok, bool warn, const char *name) | |
201 | { | |
202 | if (!gplok && warn) { | |
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 details.\n"); | |
9f28bb7e | 209 | } |
ad9546c9 RR |
210 | return true; |
211 | } | |
1da177e4 | 212 | |
ad9546c9 RR |
213 | struct symsearch { |
214 | const struct kernel_symbol *start, *stop; | |
215 | const unsigned long *crcs; | |
216 | bool (*check)(bool gplok, bool warn, const char *name); | |
217 | }; | |
218 | ||
219 | /* Look through this array of symbol tables for a symbol match which | |
220 | * passes the check function. */ | |
221 | static const struct kernel_symbol *search_symarrays(const struct symsearch *arr, | |
222 | unsigned int num, | |
223 | const char *name, | |
224 | bool gplok, | |
225 | bool warn, | |
226 | const unsigned long **crc) | |
227 | { | |
228 | unsigned int i; | |
229 | const struct kernel_symbol *ks; | |
230 | ||
231 | for (i = 0; i < num; i++) { | |
232 | ks = lookup_symbol(name, arr[i].start, arr[i].stop); | |
233 | if (!ks || !arr[i].check(gplok, warn, name)) | |
234 | continue; | |
235 | ||
236 | if (crc) | |
237 | *crc = symversion(arr[i].crcs, ks - arr[i].start); | |
238 | return ks; | |
f71d20e9 | 239 | } |
ad9546c9 RR |
240 | return NULL; |
241 | } | |
242 | ||
243 | /* Find a symbol, return value, (optional) crc and (optional) module | |
244 | * which owns it */ | |
245 | static unsigned long find_symbol(const char *name, | |
246 | struct module **owner, | |
247 | const unsigned long **crc, | |
248 | bool gplok, | |
249 | bool warn) | |
250 | { | |
251 | struct module *mod; | |
252 | const struct kernel_symbol *ks; | |
253 | const struct symsearch arr[] = { | |
254 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, | |
255 | always_ok }, | |
256 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, | |
257 | __start___kcrctab_gpl, gpl_only }, | |
258 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, | |
259 | __start___kcrctab_gpl_future, warn_if_not_gpl }, | |
260 | { __start___ksymtab_unused, __stop___ksymtab_unused, | |
261 | __start___kcrctab_unused, printk_unused_warning }, | |
262 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, | |
263 | __start___kcrctab_unused_gpl, gpl_only_unused_warning }, | |
264 | }; | |
f71d20e9 | 265 | |
ad9546c9 RR |
266 | /* Core kernel first. */ |
267 | ks = search_symarrays(arr, ARRAY_SIZE(arr), name, gplok, warn, crc); | |
f71d20e9 | 268 | if (ks) { |
ad9546c9 RR |
269 | if (owner) |
270 | *owner = NULL; | |
f71d20e9 AV |
271 | return ks->value; |
272 | } | |
273 | ||
22a8bdeb | 274 | /* Now try modules. */ |
1da177e4 | 275 | list_for_each_entry(mod, &modules, list) { |
ad9546c9 RR |
276 | struct symsearch arr[] = { |
277 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
278 | always_ok }, | |
279 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, | |
280 | mod->gpl_crcs, gpl_only }, | |
281 | { mod->gpl_future_syms, | |
282 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
283 | mod->gpl_future_crcs, warn_if_not_gpl }, | |
284 | { mod->unused_syms, | |
285 | mod->unused_syms + mod->num_unused_syms, | |
286 | mod->unused_crcs, printk_unused_warning }, | |
287 | { mod->unused_gpl_syms, | |
288 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
289 | mod->unused_gpl_crcs, gpl_only_unused_warning }, | |
290 | }; | |
291 | ||
292 | ks = search_symarrays(arr, ARRAY_SIZE(arr), | |
293 | name, gplok, warn, crc); | |
9f28bb7e | 294 | if (ks) { |
ad9546c9 RR |
295 | if (owner) |
296 | *owner = mod; | |
9f28bb7e GKH |
297 | return ks->value; |
298 | } | |
1da177e4 | 299 | } |
ad9546c9 | 300 | |
1da177e4 | 301 | DEBUGP("Failed to find symbol %s\n", name); |
88173507 | 302 | return -ENOENT; |
1da177e4 LT |
303 | } |
304 | ||
1da177e4 LT |
305 | /* Search for module by name: must hold module_mutex. */ |
306 | static struct module *find_module(const char *name) | |
307 | { | |
308 | struct module *mod; | |
309 | ||
310 | list_for_each_entry(mod, &modules, list) { | |
311 | if (strcmp(mod->name, name) == 0) | |
312 | return mod; | |
313 | } | |
314 | return NULL; | |
315 | } | |
316 | ||
317 | #ifdef CONFIG_SMP | |
318 | /* Number of blocks used and allocated. */ | |
319 | static unsigned int pcpu_num_used, pcpu_num_allocated; | |
320 | /* Size of each block. -ve means used. */ | |
321 | static int *pcpu_size; | |
322 | ||
323 | static int split_block(unsigned int i, unsigned short size) | |
324 | { | |
325 | /* Reallocation required? */ | |
326 | if (pcpu_num_used + 1 > pcpu_num_allocated) { | |
6d4f9c55 PE |
327 | int *new; |
328 | ||
329 | new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, | |
330 | GFP_KERNEL); | |
1da177e4 LT |
331 | if (!new) |
332 | return 0; | |
333 | ||
1da177e4 | 334 | pcpu_num_allocated *= 2; |
1da177e4 LT |
335 | pcpu_size = new; |
336 | } | |
337 | ||
338 | /* Insert a new subblock */ | |
339 | memmove(&pcpu_size[i+1], &pcpu_size[i], | |
340 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); | |
341 | pcpu_num_used++; | |
342 | ||
343 | pcpu_size[i+1] -= size; | |
344 | pcpu_size[i] = size; | |
345 | return 1; | |
346 | } | |
347 | ||
348 | static inline unsigned int block_size(int val) | |
349 | { | |
350 | if (val < 0) | |
351 | return -val; | |
352 | return val; | |
353 | } | |
354 | ||
842bbaaa RR |
355 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
356 | const char *name) | |
1da177e4 LT |
357 | { |
358 | unsigned long extra; | |
359 | unsigned int i; | |
360 | void *ptr; | |
361 | ||
b6e3590f JF |
362 | if (align > PAGE_SIZE) { |
363 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
364 | name, align, PAGE_SIZE); | |
365 | align = PAGE_SIZE; | |
842bbaaa | 366 | } |
1da177e4 LT |
367 | |
368 | ptr = __per_cpu_start; | |
369 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
370 | /* Extra for alignment requirement. */ | |
371 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; | |
372 | BUG_ON(i == 0 && extra != 0); | |
373 | ||
374 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) | |
375 | continue; | |
376 | ||
377 | /* Transfer extra to previous block. */ | |
378 | if (pcpu_size[i-1] < 0) | |
379 | pcpu_size[i-1] -= extra; | |
380 | else | |
381 | pcpu_size[i-1] += extra; | |
382 | pcpu_size[i] -= extra; | |
383 | ptr += extra; | |
384 | ||
385 | /* Split block if warranted */ | |
386 | if (pcpu_size[i] - size > sizeof(unsigned long)) | |
387 | if (!split_block(i, size)) | |
388 | return NULL; | |
389 | ||
390 | /* Mark allocated */ | |
391 | pcpu_size[i] = -pcpu_size[i]; | |
392 | return ptr; | |
393 | } | |
394 | ||
395 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", | |
396 | size); | |
397 | return NULL; | |
398 | } | |
399 | ||
400 | static void percpu_modfree(void *freeme) | |
401 | { | |
402 | unsigned int i; | |
403 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); | |
404 | ||
405 | /* First entry is core kernel percpu data. */ | |
406 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
407 | if (ptr == freeme) { | |
408 | pcpu_size[i] = -pcpu_size[i]; | |
409 | goto free; | |
410 | } | |
411 | } | |
412 | BUG(); | |
413 | ||
414 | free: | |
415 | /* Merge with previous? */ | |
416 | if (pcpu_size[i-1] >= 0) { | |
417 | pcpu_size[i-1] += pcpu_size[i]; | |
418 | pcpu_num_used--; | |
419 | memmove(&pcpu_size[i], &pcpu_size[i+1], | |
420 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); | |
421 | i--; | |
422 | } | |
423 | /* Merge with next? */ | |
424 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { | |
425 | pcpu_size[i] += pcpu_size[i+1]; | |
426 | pcpu_num_used--; | |
427 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], | |
428 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); | |
429 | } | |
430 | } | |
431 | ||
432 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
433 | Elf_Shdr *sechdrs, | |
434 | const char *secstrings) | |
435 | { | |
436 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); | |
437 | } | |
438 | ||
dd5af90a MT |
439 | static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size) |
440 | { | |
441 | int cpu; | |
442 | ||
443 | for_each_possible_cpu(cpu) | |
444 | memcpy(pcpudest + per_cpu_offset(cpu), from, size); | |
445 | } | |
446 | ||
1da177e4 LT |
447 | static int percpu_modinit(void) |
448 | { | |
449 | pcpu_num_used = 2; | |
450 | pcpu_num_allocated = 2; | |
451 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, | |
452 | GFP_KERNEL); | |
453 | /* Static in-kernel percpu data (used). */ | |
b00742d3 | 454 | pcpu_size[0] = -(__per_cpu_end-__per_cpu_start); |
1da177e4 LT |
455 | /* Free room. */ |
456 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; | |
457 | if (pcpu_size[1] < 0) { | |
458 | printk(KERN_ERR "No per-cpu room for modules.\n"); | |
459 | pcpu_num_used = 1; | |
460 | } | |
461 | ||
462 | return 0; | |
22a8bdeb | 463 | } |
1da177e4 LT |
464 | __initcall(percpu_modinit); |
465 | #else /* ... !CONFIG_SMP */ | |
842bbaaa RR |
466 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
467 | const char *name) | |
1da177e4 LT |
468 | { |
469 | return NULL; | |
470 | } | |
471 | static inline void percpu_modfree(void *pcpuptr) | |
472 | { | |
473 | BUG(); | |
474 | } | |
475 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
476 | Elf_Shdr *sechdrs, | |
477 | const char *secstrings) | |
478 | { | |
479 | return 0; | |
480 | } | |
481 | static inline void percpu_modcopy(void *pcpudst, const void *src, | |
482 | unsigned long size) | |
483 | { | |
484 | /* pcpusec should be 0, and size of that section should be 0. */ | |
485 | BUG_ON(size != 0); | |
486 | } | |
487 | #endif /* CONFIG_SMP */ | |
488 | ||
c988d2b2 MD |
489 | #define MODINFO_ATTR(field) \ |
490 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
491 | { \ | |
492 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
493 | } \ | |
494 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
495 | struct module *mod, char *buffer) \ | |
496 | { \ | |
497 | return sprintf(buffer, "%s\n", mod->field); \ | |
498 | } \ | |
499 | static int modinfo_##field##_exists(struct module *mod) \ | |
500 | { \ | |
501 | return mod->field != NULL; \ | |
502 | } \ | |
503 | static void free_modinfo_##field(struct module *mod) \ | |
504 | { \ | |
22a8bdeb DW |
505 | kfree(mod->field); \ |
506 | mod->field = NULL; \ | |
c988d2b2 MD |
507 | } \ |
508 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 509 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
510 | .show = show_modinfo_##field, \ |
511 | .setup = setup_modinfo_##field, \ | |
512 | .test = modinfo_##field##_exists, \ | |
513 | .free = free_modinfo_##field, \ | |
514 | }; | |
515 | ||
516 | MODINFO_ATTR(version); | |
517 | MODINFO_ATTR(srcversion); | |
518 | ||
e14af7ee AV |
519 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
520 | ||
03e88ae1 | 521 | #ifdef CONFIG_MODULE_UNLOAD |
1da177e4 LT |
522 | /* Init the unload section of the module. */ |
523 | static void module_unload_init(struct module *mod) | |
524 | { | |
525 | unsigned int i; | |
526 | ||
527 | INIT_LIST_HEAD(&mod->modules_which_use_me); | |
528 | for (i = 0; i < NR_CPUS; i++) | |
529 | local_set(&mod->ref[i].count, 0); | |
530 | /* Hold reference count during initialization. */ | |
39c715b7 | 531 | local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
1da177e4 LT |
532 | /* Backwards compatibility macros put refcount during init. */ |
533 | mod->waiter = current; | |
534 | } | |
535 | ||
536 | /* modules using other modules */ | |
537 | struct module_use | |
538 | { | |
539 | struct list_head list; | |
540 | struct module *module_which_uses; | |
541 | }; | |
542 | ||
543 | /* Does a already use b? */ | |
544 | static int already_uses(struct module *a, struct module *b) | |
545 | { | |
546 | struct module_use *use; | |
547 | ||
548 | list_for_each_entry(use, &b->modules_which_use_me, list) { | |
549 | if (use->module_which_uses == a) { | |
550 | DEBUGP("%s uses %s!\n", a->name, b->name); | |
551 | return 1; | |
552 | } | |
553 | } | |
554 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | /* Module a uses b */ | |
559 | static int use_module(struct module *a, struct module *b) | |
560 | { | |
561 | struct module_use *use; | |
c9a3ba55 | 562 | int no_warn, err; |
270a6c4c | 563 | |
1da177e4 LT |
564 | if (b == NULL || already_uses(a, b)) return 1; |
565 | ||
c9a3ba55 RR |
566 | /* If we're interrupted or time out, we fail. */ |
567 | if (wait_event_interruptible_timeout( | |
568 | module_wq, (err = strong_try_module_get(b)) != -EBUSY, | |
569 | 30 * HZ) <= 0) { | |
570 | printk("%s: gave up waiting for init of module %s.\n", | |
571 | a->name, b->name); | |
572 | return 0; | |
573 | } | |
574 | ||
575 | /* If strong_try_module_get() returned a different error, we fail. */ | |
576 | if (err) | |
1da177e4 LT |
577 | return 0; |
578 | ||
579 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
580 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
581 | if (!use) { | |
582 | printk("%s: out of memory loading\n", a->name); | |
583 | module_put(b); | |
584 | return 0; | |
585 | } | |
586 | ||
587 | use->module_which_uses = a; | |
588 | list_add(&use->list, &b->modules_which_use_me); | |
270a6c4c | 589 | no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
1da177e4 LT |
590 | return 1; |
591 | } | |
592 | ||
593 | /* Clear the unload stuff of the module. */ | |
594 | static void module_unload_free(struct module *mod) | |
595 | { | |
596 | struct module *i; | |
597 | ||
598 | list_for_each_entry(i, &modules, list) { | |
599 | struct module_use *use; | |
600 | ||
601 | list_for_each_entry(use, &i->modules_which_use_me, list) { | |
602 | if (use->module_which_uses == mod) { | |
603 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
604 | module_put(i); | |
605 | list_del(&use->list); | |
606 | kfree(use); | |
270a6c4c | 607 | sysfs_remove_link(i->holders_dir, mod->name); |
1da177e4 LT |
608 | /* There can be at most one match. */ |
609 | break; | |
610 | } | |
611 | } | |
612 | } | |
613 | } | |
614 | ||
615 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 616 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
617 | { |
618 | int ret = (flags & O_TRUNC); | |
619 | if (ret) | |
fb169793 | 620 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
621 | return ret; |
622 | } | |
623 | #else | |
fb169793 | 624 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
625 | { |
626 | return 0; | |
627 | } | |
628 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
629 | ||
630 | struct stopref | |
631 | { | |
632 | struct module *mod; | |
633 | int flags; | |
634 | int *forced; | |
635 | }; | |
636 | ||
637 | /* Whole machine is stopped with interrupts off when this runs. */ | |
638 | static int __try_stop_module(void *_sref) | |
639 | { | |
640 | struct stopref *sref = _sref; | |
641 | ||
642 | /* If it's not unused, quit unless we are told to block. */ | |
643 | if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) { | |
fb169793 | 644 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
645 | return -EWOULDBLOCK; |
646 | } | |
647 | ||
648 | /* Mark it as dying. */ | |
649 | sref->mod->state = MODULE_STATE_GOING; | |
650 | return 0; | |
651 | } | |
652 | ||
653 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
654 | { | |
655 | struct stopref sref = { mod, flags, forced }; | |
656 | ||
657 | return stop_machine_run(__try_stop_module, &sref, NR_CPUS); | |
658 | } | |
659 | ||
660 | unsigned int module_refcount(struct module *mod) | |
661 | { | |
662 | unsigned int i, total = 0; | |
663 | ||
664 | for (i = 0; i < NR_CPUS; i++) | |
665 | total += local_read(&mod->ref[i].count); | |
666 | return total; | |
667 | } | |
668 | EXPORT_SYMBOL(module_refcount); | |
669 | ||
670 | /* This exists whether we can unload or not */ | |
671 | static void free_module(struct module *mod); | |
672 | ||
673 | static void wait_for_zero_refcount(struct module *mod) | |
674 | { | |
a6550207 | 675 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 676 | mutex_unlock(&module_mutex); |
1da177e4 LT |
677 | for (;;) { |
678 | DEBUGP("Looking at refcount...\n"); | |
679 | set_current_state(TASK_UNINTERRUPTIBLE); | |
680 | if (module_refcount(mod) == 0) | |
681 | break; | |
682 | schedule(); | |
683 | } | |
684 | current->state = TASK_RUNNING; | |
6389a385 | 685 | mutex_lock(&module_mutex); |
1da177e4 LT |
686 | } |
687 | ||
dfff0a06 GKH |
688 | asmlinkage long |
689 | sys_delete_module(const char __user *name_user, unsigned int flags) | |
1da177e4 LT |
690 | { |
691 | struct module *mod; | |
dfff0a06 | 692 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
693 | int ret, forced = 0; |
694 | ||
dfff0a06 GKH |
695 | if (!capable(CAP_SYS_MODULE)) |
696 | return -EPERM; | |
697 | ||
698 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
699 | return -EFAULT; | |
700 | name[MODULE_NAME_LEN-1] = '\0'; | |
701 | ||
6389a385 | 702 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
703 | return -EINTR; |
704 | ||
705 | mod = find_module(name); | |
706 | if (!mod) { | |
707 | ret = -ENOENT; | |
708 | goto out; | |
709 | } | |
710 | ||
711 | if (!list_empty(&mod->modules_which_use_me)) { | |
712 | /* Other modules depend on us: get rid of them first. */ | |
713 | ret = -EWOULDBLOCK; | |
714 | goto out; | |
715 | } | |
716 | ||
717 | /* Doing init or already dying? */ | |
718 | if (mod->state != MODULE_STATE_LIVE) { | |
719 | /* FIXME: if (force), slam module count and wake up | |
720 | waiter --RR */ | |
721 | DEBUGP("%s already dying\n", mod->name); | |
722 | ret = -EBUSY; | |
723 | goto out; | |
724 | } | |
725 | ||
726 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 727 | if (mod->init && !mod->exit) { |
fb169793 | 728 | forced = try_force_unload(flags); |
1da177e4 LT |
729 | if (!forced) { |
730 | /* This module can't be removed */ | |
731 | ret = -EBUSY; | |
732 | goto out; | |
733 | } | |
734 | } | |
735 | ||
736 | /* Set this up before setting mod->state */ | |
737 | mod->waiter = current; | |
738 | ||
739 | /* Stop the machine so refcounts can't move and disable module. */ | |
740 | ret = try_stop_module(mod, flags, &forced); | |
741 | if (ret != 0) | |
742 | goto out; | |
743 | ||
744 | /* Never wait if forced. */ | |
745 | if (!forced && module_refcount(mod) != 0) | |
746 | wait_for_zero_refcount(mod); | |
747 | ||
748 | /* Final destruction now noone is using it. */ | |
749 | if (mod->exit != NULL) { | |
6389a385 | 750 | mutex_unlock(&module_mutex); |
1da177e4 | 751 | mod->exit(); |
6389a385 | 752 | mutex_lock(&module_mutex); |
1da177e4 | 753 | } |
e14af7ee | 754 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 755 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 LT |
756 | free_module(mod); |
757 | ||
758 | out: | |
6389a385 | 759 | mutex_unlock(&module_mutex); |
1da177e4 LT |
760 | return ret; |
761 | } | |
762 | ||
763 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
764 | { | |
765 | struct module_use *use; | |
766 | int printed_something = 0; | |
767 | ||
768 | seq_printf(m, " %u ", module_refcount(mod)); | |
769 | ||
770 | /* Always include a trailing , so userspace can differentiate | |
771 | between this and the old multi-field proc format. */ | |
772 | list_for_each_entry(use, &mod->modules_which_use_me, list) { | |
773 | printed_something = 1; | |
774 | seq_printf(m, "%s,", use->module_which_uses->name); | |
775 | } | |
776 | ||
1da177e4 LT |
777 | if (mod->init != NULL && mod->exit == NULL) { |
778 | printed_something = 1; | |
779 | seq_printf(m, "[permanent],"); | |
780 | } | |
781 | ||
782 | if (!printed_something) | |
783 | seq_printf(m, "-"); | |
784 | } | |
785 | ||
786 | void __symbol_put(const char *symbol) | |
787 | { | |
788 | struct module *owner; | |
1da177e4 | 789 | |
24da1cbf | 790 | preempt_disable(); |
ad9546c9 | 791 | if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false))) |
1da177e4 LT |
792 | BUG(); |
793 | module_put(owner); | |
24da1cbf | 794 | preempt_enable(); |
1da177e4 LT |
795 | } |
796 | EXPORT_SYMBOL(__symbol_put); | |
797 | ||
798 | void symbol_put_addr(void *addr) | |
799 | { | |
5e376613 | 800 | struct module *modaddr; |
1da177e4 | 801 | |
5e376613 TP |
802 | if (core_kernel_text((unsigned long)addr)) |
803 | return; | |
1da177e4 | 804 | |
5e376613 TP |
805 | if (!(modaddr = module_text_address((unsigned long)addr))) |
806 | BUG(); | |
807 | module_put(modaddr); | |
1da177e4 LT |
808 | } |
809 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
810 | ||
811 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
812 | struct module *mod, char *buffer) | |
813 | { | |
256e2fdf | 814 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
815 | } |
816 | ||
817 | static struct module_attribute refcnt = { | |
7b595756 | 818 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
819 | .show = show_refcnt, |
820 | }; | |
821 | ||
f6a57033 AV |
822 | void module_put(struct module *module) |
823 | { | |
824 | if (module) { | |
825 | unsigned int cpu = get_cpu(); | |
826 | local_dec(&module->ref[cpu].count); | |
827 | /* Maybe they're waiting for us to drop reference? */ | |
828 | if (unlikely(!module_is_live(module))) | |
829 | wake_up_process(module->waiter); | |
830 | put_cpu(); | |
831 | } | |
832 | } | |
833 | EXPORT_SYMBOL(module_put); | |
834 | ||
1da177e4 LT |
835 | #else /* !CONFIG_MODULE_UNLOAD */ |
836 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
837 | { | |
838 | /* We don't know the usage count, or what modules are using. */ | |
839 | seq_printf(m, " - -"); | |
840 | } | |
841 | ||
842 | static inline void module_unload_free(struct module *mod) | |
843 | { | |
844 | } | |
845 | ||
846 | static inline int use_module(struct module *a, struct module *b) | |
847 | { | |
c9a3ba55 | 848 | return strong_try_module_get(b) == 0; |
1da177e4 LT |
849 | } |
850 | ||
851 | static inline void module_unload_init(struct module *mod) | |
852 | { | |
853 | } | |
854 | #endif /* CONFIG_MODULE_UNLOAD */ | |
855 | ||
1f71740a KS |
856 | static ssize_t show_initstate(struct module_attribute *mattr, |
857 | struct module *mod, char *buffer) | |
858 | { | |
859 | const char *state = "unknown"; | |
860 | ||
861 | switch (mod->state) { | |
862 | case MODULE_STATE_LIVE: | |
863 | state = "live"; | |
864 | break; | |
865 | case MODULE_STATE_COMING: | |
866 | state = "coming"; | |
867 | break; | |
868 | case MODULE_STATE_GOING: | |
869 | state = "going"; | |
870 | break; | |
871 | } | |
872 | return sprintf(buffer, "%s\n", state); | |
873 | } | |
874 | ||
875 | static struct module_attribute initstate = { | |
7b595756 | 876 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
877 | .show = show_initstate, |
878 | }; | |
879 | ||
03e88ae1 GKH |
880 | static struct module_attribute *modinfo_attrs[] = { |
881 | &modinfo_version, | |
882 | &modinfo_srcversion, | |
1f71740a | 883 | &initstate, |
03e88ae1 GKH |
884 | #ifdef CONFIG_MODULE_UNLOAD |
885 | &refcnt, | |
886 | #endif | |
887 | NULL, | |
888 | }; | |
889 | ||
1da177e4 LT |
890 | static const char vermagic[] = VERMAGIC_STRING; |
891 | ||
892 | #ifdef CONFIG_MODVERSIONS | |
893 | static int check_version(Elf_Shdr *sechdrs, | |
894 | unsigned int versindex, | |
895 | const char *symname, | |
896 | struct module *mod, | |
897 | const unsigned long *crc) | |
898 | { | |
899 | unsigned int i, num_versions; | |
900 | struct modversion_info *versions; | |
901 | ||
902 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
903 | if (!crc) | |
904 | return 1; | |
905 | ||
906 | versions = (void *) sechdrs[versindex].sh_addr; | |
907 | num_versions = sechdrs[versindex].sh_size | |
908 | / sizeof(struct modversion_info); | |
909 | ||
910 | for (i = 0; i < num_versions; i++) { | |
911 | if (strcmp(versions[i].name, symname) != 0) | |
912 | continue; | |
913 | ||
914 | if (versions[i].crc == *crc) | |
915 | return 1; | |
916 | printk("%s: disagrees about version of symbol %s\n", | |
917 | mod->name, symname); | |
918 | DEBUGP("Found checksum %lX vs module %lX\n", | |
919 | *crc, versions[i].crc); | |
920 | return 0; | |
921 | } | |
922 | /* Not in module's version table. OK, but that taints the kernel. */ | |
fa3ba2e8 | 923 | if (!(tainted & TAINT_FORCED_MODULE)) |
1da177e4 LT |
924 | printk("%s: no version for \"%s\" found: kernel tainted.\n", |
925 | mod->name, symname); | |
fa3ba2e8 | 926 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1da177e4 LT |
927 | return 1; |
928 | } | |
929 | ||
930 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
931 | unsigned int versindex, | |
932 | struct module *mod) | |
933 | { | |
934 | const unsigned long *crc; | |
1da177e4 | 935 | |
ad9546c9 | 936 | if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false))) |
1da177e4 | 937 | BUG(); |
ad9546c9 | 938 | return check_version(sechdrs, versindex, "struct_module", mod, crc); |
1da177e4 LT |
939 | } |
940 | ||
941 | /* First part is kernel version, which we ignore. */ | |
942 | static inline int same_magic(const char *amagic, const char *bmagic) | |
943 | { | |
944 | amagic += strcspn(amagic, " "); | |
945 | bmagic += strcspn(bmagic, " "); | |
946 | return strcmp(amagic, bmagic) == 0; | |
947 | } | |
948 | #else | |
949 | static inline int check_version(Elf_Shdr *sechdrs, | |
950 | unsigned int versindex, | |
951 | const char *symname, | |
952 | struct module *mod, | |
953 | const unsigned long *crc) | |
954 | { | |
955 | return 1; | |
956 | } | |
957 | ||
958 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
959 | unsigned int versindex, | |
960 | struct module *mod) | |
961 | { | |
962 | return 1; | |
963 | } | |
964 | ||
965 | static inline int same_magic(const char *amagic, const char *bmagic) | |
966 | { | |
967 | return strcmp(amagic, bmagic) == 0; | |
968 | } | |
969 | #endif /* CONFIG_MODVERSIONS */ | |
970 | ||
971 | /* Resolve a symbol for this module. I.e. if we find one, record usage. | |
972 | Must be holding module_mutex. */ | |
973 | static unsigned long resolve_symbol(Elf_Shdr *sechdrs, | |
974 | unsigned int versindex, | |
975 | const char *name, | |
976 | struct module *mod) | |
977 | { | |
978 | struct module *owner; | |
979 | unsigned long ret; | |
980 | const unsigned long *crc; | |
981 | ||
ad9546c9 RR |
982 | ret = find_symbol(name, &owner, &crc, |
983 | !(mod->taints & TAINT_PROPRIETARY_MODULE), true); | |
88173507 | 984 | if (!IS_ERR_VALUE(ret)) { |
9a4b9708 ML |
985 | /* use_module can fail due to OOM, |
986 | or module initialization or unloading */ | |
1da177e4 LT |
987 | if (!check_version(sechdrs, versindex, name, mod, crc) || |
988 | !use_module(mod, owner)) | |
88173507 | 989 | ret = -EINVAL; |
1da177e4 | 990 | } |
1da177e4 LT |
991 | return ret; |
992 | } | |
993 | ||
1da177e4 LT |
994 | /* |
995 | * /sys/module/foo/sections stuff | |
996 | * J. Corbet <corbet@lwn.net> | |
997 | */ | |
120fc3d7 | 998 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
a58730c4 RR |
999 | struct module_sect_attr |
1000 | { | |
1001 | struct module_attribute mattr; | |
1002 | char *name; | |
1003 | unsigned long address; | |
1004 | }; | |
1005 | ||
1006 | struct module_sect_attrs | |
1007 | { | |
1008 | struct attribute_group grp; | |
1009 | unsigned int nsections; | |
1010 | struct module_sect_attr attrs[0]; | |
1011 | }; | |
1012 | ||
1da177e4 LT |
1013 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1014 | struct module *mod, char *buf) | |
1015 | { | |
1016 | struct module_sect_attr *sattr = | |
1017 | container_of(mattr, struct module_sect_attr, mattr); | |
1018 | return sprintf(buf, "0x%lx\n", sattr->address); | |
1019 | } | |
1020 | ||
04b1db9f IN |
1021 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1022 | { | |
a58730c4 | 1023 | unsigned int section; |
04b1db9f IN |
1024 | |
1025 | for (section = 0; section < sect_attrs->nsections; section++) | |
1026 | kfree(sect_attrs->attrs[section].name); | |
1027 | kfree(sect_attrs); | |
1028 | } | |
1029 | ||
1da177e4 LT |
1030 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1031 | char *secstrings, Elf_Shdr *sechdrs) | |
1032 | { | |
1033 | unsigned int nloaded = 0, i, size[2]; | |
1034 | struct module_sect_attrs *sect_attrs; | |
1035 | struct module_sect_attr *sattr; | |
1036 | struct attribute **gattr; | |
22a8bdeb | 1037 | |
1da177e4 LT |
1038 | /* Count loaded sections and allocate structures */ |
1039 | for (i = 0; i < nsect; i++) | |
1040 | if (sechdrs[i].sh_flags & SHF_ALLOC) | |
1041 | nloaded++; | |
1042 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1043 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1044 | sizeof(sect_attrs->grp.attrs[0])); | |
1045 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1046 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1047 | if (sect_attrs == NULL) | |
1da177e4 LT |
1048 | return; |
1049 | ||
1050 | /* Setup section attributes. */ | |
1051 | sect_attrs->grp.name = "sections"; | |
1052 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1053 | ||
04b1db9f | 1054 | sect_attrs->nsections = 0; |
1da177e4 LT |
1055 | sattr = §_attrs->attrs[0]; |
1056 | gattr = §_attrs->grp.attrs[0]; | |
1057 | for (i = 0; i < nsect; i++) { | |
1058 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) | |
1059 | continue; | |
1060 | sattr->address = sechdrs[i].sh_addr; | |
04b1db9f IN |
1061 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1062 | GFP_KERNEL); | |
1063 | if (sattr->name == NULL) | |
1064 | goto out; | |
1065 | sect_attrs->nsections++; | |
1da177e4 LT |
1066 | sattr->mattr.show = module_sect_show; |
1067 | sattr->mattr.store = NULL; | |
1068 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1069 | sattr->mattr.attr.mode = S_IRUGO; |
1070 | *(gattr++) = &(sattr++)->mattr.attr; | |
1071 | } | |
1072 | *gattr = NULL; | |
1073 | ||
1074 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1075 | goto out; | |
1076 | ||
1077 | mod->sect_attrs = sect_attrs; | |
1078 | return; | |
1079 | out: | |
04b1db9f | 1080 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1081 | } |
1082 | ||
1083 | static void remove_sect_attrs(struct module *mod) | |
1084 | { | |
1085 | if (mod->sect_attrs) { | |
1086 | sysfs_remove_group(&mod->mkobj.kobj, | |
1087 | &mod->sect_attrs->grp); | |
1088 | /* We are positive that no one is using any sect attrs | |
1089 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1090 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1091 | mod->sect_attrs = NULL; |
1092 | } | |
1093 | } | |
1094 | ||
6d760133 RM |
1095 | /* |
1096 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1097 | */ | |
1098 | ||
1099 | struct module_notes_attrs { | |
1100 | struct kobject *dir; | |
1101 | unsigned int notes; | |
1102 | struct bin_attribute attrs[0]; | |
1103 | }; | |
1104 | ||
1105 | static ssize_t module_notes_read(struct kobject *kobj, | |
1106 | struct bin_attribute *bin_attr, | |
1107 | char *buf, loff_t pos, size_t count) | |
1108 | { | |
1109 | /* | |
1110 | * The caller checked the pos and count against our size. | |
1111 | */ | |
1112 | memcpy(buf, bin_attr->private + pos, count); | |
1113 | return count; | |
1114 | } | |
1115 | ||
1116 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1117 | unsigned int i) | |
1118 | { | |
1119 | if (notes_attrs->dir) { | |
1120 | while (i-- > 0) | |
1121 | sysfs_remove_bin_file(notes_attrs->dir, | |
1122 | ¬es_attrs->attrs[i]); | |
1123 | kobject_del(notes_attrs->dir); | |
1124 | } | |
1125 | kfree(notes_attrs); | |
1126 | } | |
1127 | ||
1128 | static void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1129 | char *secstrings, Elf_Shdr *sechdrs) | |
1130 | { | |
1131 | unsigned int notes, loaded, i; | |
1132 | struct module_notes_attrs *notes_attrs; | |
1133 | struct bin_attribute *nattr; | |
1134 | ||
1135 | /* Count notes sections and allocate structures. */ | |
1136 | notes = 0; | |
1137 | for (i = 0; i < nsect; i++) | |
1138 | if ((sechdrs[i].sh_flags & SHF_ALLOC) && | |
1139 | (sechdrs[i].sh_type == SHT_NOTE)) | |
1140 | ++notes; | |
1141 | ||
1142 | if (notes == 0) | |
1143 | return; | |
1144 | ||
1145 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1146 | + notes * sizeof(notes_attrs->attrs[0]), | |
1147 | GFP_KERNEL); | |
1148 | if (notes_attrs == NULL) | |
1149 | return; | |
1150 | ||
1151 | notes_attrs->notes = notes; | |
1152 | nattr = ¬es_attrs->attrs[0]; | |
1153 | for (loaded = i = 0; i < nsect; ++i) { | |
1154 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1155 | continue; | |
1156 | if (sechdrs[i].sh_type == SHT_NOTE) { | |
1157 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; | |
1158 | nattr->attr.mode = S_IRUGO; | |
1159 | nattr->size = sechdrs[i].sh_size; | |
1160 | nattr->private = (void *) sechdrs[i].sh_addr; | |
1161 | nattr->read = module_notes_read; | |
1162 | ++nattr; | |
1163 | } | |
1164 | ++loaded; | |
1165 | } | |
1166 | ||
4ff6abff | 1167 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1168 | if (!notes_attrs->dir) |
1169 | goto out; | |
1170 | ||
1171 | for (i = 0; i < notes; ++i) | |
1172 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1173 | ¬es_attrs->attrs[i])) | |
1174 | goto out; | |
1175 | ||
1176 | mod->notes_attrs = notes_attrs; | |
1177 | return; | |
1178 | ||
1179 | out: | |
1180 | free_notes_attrs(notes_attrs, i); | |
1181 | } | |
1182 | ||
1183 | static void remove_notes_attrs(struct module *mod) | |
1184 | { | |
1185 | if (mod->notes_attrs) | |
1186 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1187 | } | |
1188 | ||
1da177e4 | 1189 | #else |
04b1db9f | 1190 | |
1da177e4 LT |
1191 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1192 | char *sectstrings, Elf_Shdr *sechdrs) | |
1193 | { | |
1194 | } | |
1195 | ||
1196 | static inline void remove_sect_attrs(struct module *mod) | |
1197 | { | |
1198 | } | |
6d760133 RM |
1199 | |
1200 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1201 | char *sectstrings, Elf_Shdr *sechdrs) | |
1202 | { | |
1203 | } | |
1204 | ||
1205 | static inline void remove_notes_attrs(struct module *mod) | |
1206 | { | |
1207 | } | |
120fc3d7 | 1208 | #endif |
1da177e4 | 1209 | |
ef665c1a RD |
1210 | #ifdef CONFIG_SYSFS |
1211 | int module_add_modinfo_attrs(struct module *mod) | |
c988d2b2 MD |
1212 | { |
1213 | struct module_attribute *attr; | |
03e88ae1 | 1214 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1215 | int error = 0; |
1216 | int i; | |
1217 | ||
03e88ae1 GKH |
1218 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1219 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1220 | GFP_KERNEL); | |
1221 | if (!mod->modinfo_attrs) | |
1222 | return -ENOMEM; | |
1223 | ||
1224 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1225 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1226 | if (!attr->test || | |
03e88ae1 GKH |
1227 | (attr->test && attr->test(mod))) { |
1228 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
03e88ae1 GKH |
1229 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1230 | ++temp_attr; | |
1231 | } | |
c988d2b2 MD |
1232 | } |
1233 | return error; | |
1234 | } | |
1235 | ||
ef665c1a | 1236 | void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1237 | { |
1238 | struct module_attribute *attr; | |
1239 | int i; | |
1240 | ||
03e88ae1 GKH |
1241 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1242 | /* pick a field to test for end of list */ | |
1243 | if (!attr->attr.name) | |
1244 | break; | |
c988d2b2 | 1245 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1246 | if (attr->free) |
1247 | attr->free(mod); | |
c988d2b2 | 1248 | } |
03e88ae1 | 1249 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1250 | } |
1da177e4 | 1251 | |
ef665c1a | 1252 | int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1253 | { |
1254 | int err; | |
6494a93d | 1255 | struct kobject *kobj; |
1da177e4 | 1256 | |
823bccfc GKH |
1257 | if (!module_sysfs_initialized) { |
1258 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1259 | mod->name); |
1260 | err = -EINVAL; | |
1261 | goto out; | |
1262 | } | |
6494a93d GKH |
1263 | |
1264 | kobj = kset_find_obj(module_kset, mod->name); | |
1265 | if (kobj) { | |
1266 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1267 | kobject_put(kobj); | |
1268 | err = -EINVAL; | |
1269 | goto out; | |
1270 | } | |
1271 | ||
1da177e4 | 1272 | mod->mkobj.mod = mod; |
e17e0f51 | 1273 | |
ac3c8141 GKH |
1274 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1275 | mod->mkobj.kobj.kset = module_kset; | |
1276 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1277 | "%s", mod->name); | |
1278 | if (err) | |
1279 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1280 | |
97c146ef | 1281 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1282 | out: |
1283 | return err; | |
1284 | } | |
1285 | ||
ef665c1a | 1286 | int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1287 | struct kernel_param *kparam, |
1288 | unsigned int num_params) | |
1289 | { | |
1290 | int err; | |
1291 | ||
4ff6abff | 1292 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1293 | if (!mod->holders_dir) { |
1294 | err = -ENOMEM; | |
270a6c4c | 1295 | goto out_unreg; |
240936e1 | 1296 | } |
270a6c4c | 1297 | |
1da177e4 LT |
1298 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1299 | if (err) | |
270a6c4c | 1300 | goto out_unreg_holders; |
1da177e4 | 1301 | |
c988d2b2 MD |
1302 | err = module_add_modinfo_attrs(mod); |
1303 | if (err) | |
e17e0f51 | 1304 | goto out_unreg_param; |
c988d2b2 | 1305 | |
e17e0f51 | 1306 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1307 | return 0; |
1308 | ||
e17e0f51 KS |
1309 | out_unreg_param: |
1310 | module_param_sysfs_remove(mod); | |
270a6c4c | 1311 | out_unreg_holders: |
78a2d906 | 1312 | kobject_put(mod->holders_dir); |
270a6c4c | 1313 | out_unreg: |
e17e0f51 | 1314 | kobject_put(&mod->mkobj.kobj); |
1da177e4 LT |
1315 | return err; |
1316 | } | |
ef665c1a | 1317 | #endif |
1da177e4 LT |
1318 | |
1319 | static void mod_kobject_remove(struct module *mod) | |
1320 | { | |
c988d2b2 | 1321 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1322 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1323 | kobject_put(mod->mkobj.drivers_dir); |
1324 | kobject_put(mod->holders_dir); | |
1325 | kobject_put(&mod->mkobj.kobj); | |
1da177e4 LT |
1326 | } |
1327 | ||
bb9d3d56 RR |
1328 | /* |
1329 | * link the module with the whole machine is stopped with interrupts off | |
1330 | * - this defends against kallsyms not taking locks | |
1331 | */ | |
1332 | static int __link_module(void *_mod) | |
1333 | { | |
1334 | struct module *mod = _mod; | |
1335 | list_add(&mod->list, &modules); | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1da177e4 LT |
1339 | /* |
1340 | * unlink the module with the whole machine is stopped with interrupts off | |
1341 | * - this defends against kallsyms not taking locks | |
1342 | */ | |
1343 | static int __unlink_module(void *_mod) | |
1344 | { | |
1345 | struct module *mod = _mod; | |
1346 | list_del(&mod->list); | |
1347 | return 0; | |
1348 | } | |
1349 | ||
02a3e59a | 1350 | /* Free a module, remove from lists, etc (must hold module_mutex). */ |
1da177e4 LT |
1351 | static void free_module(struct module *mod) |
1352 | { | |
1353 | /* Delete from various lists */ | |
1354 | stop_machine_run(__unlink_module, mod, NR_CPUS); | |
6d760133 | 1355 | remove_notes_attrs(mod); |
1da177e4 LT |
1356 | remove_sect_attrs(mod); |
1357 | mod_kobject_remove(mod); | |
1358 | ||
4552d5dc JB |
1359 | unwind_remove_table(mod->unwind_info, 0); |
1360 | ||
1da177e4 LT |
1361 | /* Arch-specific cleanup. */ |
1362 | module_arch_cleanup(mod); | |
1363 | ||
1364 | /* Module unload stuff */ | |
1365 | module_unload_free(mod); | |
1366 | ||
1367 | /* This may be NULL, but that's OK */ | |
1368 | module_free(mod, mod->module_init); | |
1369 | kfree(mod->args); | |
1370 | if (mod->percpu) | |
1371 | percpu_modfree(mod->percpu); | |
1372 | ||
fbb9ce95 IM |
1373 | /* Free lock-classes: */ |
1374 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1375 | ||
1da177e4 LT |
1376 | /* Finally, free the core (containing the module structure) */ |
1377 | module_free(mod, mod->module_core); | |
1378 | } | |
1379 | ||
1380 | void *__symbol_get(const char *symbol) | |
1381 | { | |
1382 | struct module *owner; | |
24da1cbf | 1383 | unsigned long value; |
1da177e4 | 1384 | |
24da1cbf | 1385 | preempt_disable(); |
ad9546c9 | 1386 | value = find_symbol(symbol, &owner, NULL, true, true); |
88173507 CL |
1387 | if (IS_ERR_VALUE(value)) |
1388 | value = 0; | |
1389 | else if (strong_try_module_get(owner)) | |
1da177e4 | 1390 | value = 0; |
24da1cbf | 1391 | preempt_enable(); |
1da177e4 LT |
1392 | |
1393 | return (void *)value; | |
1394 | } | |
1395 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1396 | ||
eea8b54d AN |
1397 | /* |
1398 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1399 | * in the kernel or in some other module's exported symbol table. |
eea8b54d AN |
1400 | */ |
1401 | static int verify_export_symbols(struct module *mod) | |
1402 | { | |
b211104d | 1403 | unsigned int i; |
eea8b54d | 1404 | struct module *owner; |
b211104d RR |
1405 | const struct kernel_symbol *s; |
1406 | struct { | |
1407 | const struct kernel_symbol *sym; | |
1408 | unsigned int num; | |
1409 | } arr[] = { | |
1410 | { mod->syms, mod->num_syms }, | |
1411 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1412 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
1413 | { mod->unused_syms, mod->num_unused_syms }, | |
1414 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
1415 | }; | |
eea8b54d | 1416 | |
b211104d RR |
1417 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1418 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
1419 | if (!IS_ERR_VALUE(find_symbol(s->name, &owner, | |
1420 | NULL, true, false))) { | |
1421 | printk(KERN_ERR | |
1422 | "%s: exports duplicate symbol %s" | |
1423 | " (owned by %s)\n", | |
1424 | mod->name, s->name, module_name(owner)); | |
1425 | return -ENOEXEC; | |
1426 | } | |
eea8b54d | 1427 | } |
b211104d RR |
1428 | } |
1429 | return 0; | |
eea8b54d AN |
1430 | } |
1431 | ||
9a4b9708 | 1432 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4 LT |
1433 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1434 | unsigned int symindex, | |
1435 | const char *strtab, | |
1436 | unsigned int versindex, | |
1437 | unsigned int pcpuindex, | |
1438 | struct module *mod) | |
1439 | { | |
1440 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1441 | unsigned long secbase; | |
1442 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1443 | int ret = 0; | |
1444 | ||
1445 | for (i = 1; i < n; i++) { | |
1446 | switch (sym[i].st_shndx) { | |
1447 | case SHN_COMMON: | |
1448 | /* We compiled with -fno-common. These are not | |
1449 | supposed to happen. */ | |
1450 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1451 | printk("%s: please compile with -fno-common\n", | |
1452 | mod->name); | |
1453 | ret = -ENOEXEC; | |
1454 | break; | |
1455 | ||
1456 | case SHN_ABS: | |
1457 | /* Don't need to do anything */ | |
1458 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1459 | (long)sym[i].st_value); | |
1460 | break; | |
1461 | ||
1462 | case SHN_UNDEF: | |
1463 | sym[i].st_value | |
1464 | = resolve_symbol(sechdrs, versindex, | |
1465 | strtab + sym[i].st_name, mod); | |
1466 | ||
1467 | /* Ok if resolved. */ | |
88173507 | 1468 | if (!IS_ERR_VALUE(sym[i].st_value)) |
1da177e4 LT |
1469 | break; |
1470 | /* Ok if weak. */ | |
1471 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) | |
1472 | break; | |
1473 | ||
1474 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
1475 | mod->name, strtab + sym[i].st_name); | |
1476 | ret = -ENOENT; | |
1477 | break; | |
1478 | ||
1479 | default: | |
1480 | /* Divert to percpu allocation if a percpu var. */ | |
1481 | if (sym[i].st_shndx == pcpuindex) | |
1482 | secbase = (unsigned long)mod->percpu; | |
1483 | else | |
1484 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1485 | sym[i].st_value += secbase; | |
1486 | break; | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | return ret; | |
1491 | } | |
1492 | ||
1493 | /* Update size with this section: return offset. */ | |
1494 | static long get_offset(unsigned long *size, Elf_Shdr *sechdr) | |
1495 | { | |
1496 | long ret; | |
1497 | ||
1498 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); | |
1499 | *size = ret + sechdr->sh_size; | |
1500 | return ret; | |
1501 | } | |
1502 | ||
1503 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1504 | might -- code, read-only data, read-write data, small data. Tally | |
1505 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1506 | belongs in init. */ | |
1507 | static void layout_sections(struct module *mod, | |
1508 | const Elf_Ehdr *hdr, | |
1509 | Elf_Shdr *sechdrs, | |
1510 | const char *secstrings) | |
1511 | { | |
1512 | static unsigned long const masks[][2] = { | |
1513 | /* NOTE: all executable code must be the first section | |
1514 | * in this array; otherwise modify the text_size | |
1515 | * finder in the two loops below */ | |
1516 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1517 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1518 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1519 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1520 | }; | |
1521 | unsigned int m, i; | |
1522 | ||
1523 | for (i = 0; i < hdr->e_shnum; i++) | |
1524 | sechdrs[i].sh_entsize = ~0UL; | |
1525 | ||
1526 | DEBUGP("Core section allocation order:\n"); | |
1527 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1528 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1529 | Elf_Shdr *s = &sechdrs[i]; | |
1530 | ||
1531 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1532 | || (s->sh_flags & masks[m][1]) | |
1533 | || s->sh_entsize != ~0UL | |
1534 | || strncmp(secstrings + s->sh_name, | |
1535 | ".init", 5) == 0) | |
1536 | continue; | |
1537 | s->sh_entsize = get_offset(&mod->core_size, s); | |
1538 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1539 | } | |
1540 | if (m == 0) | |
1541 | mod->core_text_size = mod->core_size; | |
1542 | } | |
1543 | ||
1544 | DEBUGP("Init section allocation order:\n"); | |
1545 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1546 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1547 | Elf_Shdr *s = &sechdrs[i]; | |
1548 | ||
1549 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1550 | || (s->sh_flags & masks[m][1]) | |
1551 | || s->sh_entsize != ~0UL | |
1552 | || strncmp(secstrings + s->sh_name, | |
1553 | ".init", 5) != 0) | |
1554 | continue; | |
1555 | s->sh_entsize = (get_offset(&mod->init_size, s) | |
1556 | | INIT_OFFSET_MASK); | |
1557 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1558 | } | |
1559 | if (m == 0) | |
1560 | mod->init_text_size = mod->init_size; | |
1561 | } | |
1562 | } | |
1563 | ||
1da177e4 LT |
1564 | static void set_license(struct module *mod, const char *license) |
1565 | { | |
1566 | if (!license) | |
1567 | license = "unspecified"; | |
1568 | ||
fa3ba2e8 FM |
1569 | if (!license_is_gpl_compatible(license)) { |
1570 | if (!(tainted & TAINT_PROPRIETARY_MODULE)) | |
1d4d2627 | 1571 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1572 | "kernel.\n", mod->name, license); |
1573 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1574 | } |
1575 | } | |
1576 | ||
1577 | /* Parse tag=value strings from .modinfo section */ | |
1578 | static char *next_string(char *string, unsigned long *secsize) | |
1579 | { | |
1580 | /* Skip non-zero chars */ | |
1581 | while (string[0]) { | |
1582 | string++; | |
1583 | if ((*secsize)-- <= 1) | |
1584 | return NULL; | |
1585 | } | |
1586 | ||
1587 | /* Skip any zero padding. */ | |
1588 | while (!string[0]) { | |
1589 | string++; | |
1590 | if ((*secsize)-- <= 1) | |
1591 | return NULL; | |
1592 | } | |
1593 | return string; | |
1594 | } | |
1595 | ||
1596 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1597 | unsigned int info, | |
1598 | const char *tag) | |
1599 | { | |
1600 | char *p; | |
1601 | unsigned int taglen = strlen(tag); | |
1602 | unsigned long size = sechdrs[info].sh_size; | |
1603 | ||
1604 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1605 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1606 | return p + taglen + 1; | |
1607 | } | |
1608 | return NULL; | |
1609 | } | |
1610 | ||
c988d2b2 MD |
1611 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1612 | unsigned int infoindex) | |
1613 | { | |
1614 | struct module_attribute *attr; | |
1615 | int i; | |
1616 | ||
1617 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1618 | if (attr->setup) | |
1619 | attr->setup(mod, | |
1620 | get_modinfo(sechdrs, | |
1621 | infoindex, | |
1622 | attr->attr.name)); | |
1623 | } | |
1624 | } | |
c988d2b2 | 1625 | |
1da177e4 | 1626 | #ifdef CONFIG_KALLSYMS |
ea07890a | 1627 | static int is_exported(const char *name, const struct module *mod) |
1da177e4 | 1628 | { |
3fd6805f SR |
1629 | if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) |
1630 | return 1; | |
1631 | else | |
f867d2a2 | 1632 | if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) |
1da177e4 | 1633 | return 1; |
3fd6805f SR |
1634 | else |
1635 | return 0; | |
1da177e4 LT |
1636 | } |
1637 | ||
1638 | /* As per nm */ | |
1639 | static char elf_type(const Elf_Sym *sym, | |
1640 | Elf_Shdr *sechdrs, | |
1641 | const char *secstrings, | |
1642 | struct module *mod) | |
1643 | { | |
1644 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1645 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1646 | return 'v'; | |
1647 | else | |
1648 | return 'w'; | |
1649 | } | |
1650 | if (sym->st_shndx == SHN_UNDEF) | |
1651 | return 'U'; | |
1652 | if (sym->st_shndx == SHN_ABS) | |
1653 | return 'a'; | |
1654 | if (sym->st_shndx >= SHN_LORESERVE) | |
1655 | return '?'; | |
1656 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1657 | return 't'; | |
1658 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1659 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1660 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1661 | return 'r'; | |
1662 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1663 | return 'g'; | |
1664 | else | |
1665 | return 'd'; | |
1666 | } | |
1667 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1668 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1669 | return 's'; | |
1670 | else | |
1671 | return 'b'; | |
1672 | } | |
1673 | if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, | |
1674 | ".debug", strlen(".debug")) == 0) | |
1675 | return 'n'; | |
1676 | return '?'; | |
1677 | } | |
1678 | ||
1679 | static void add_kallsyms(struct module *mod, | |
1680 | Elf_Shdr *sechdrs, | |
1681 | unsigned int symindex, | |
1682 | unsigned int strindex, | |
1683 | const char *secstrings) | |
1684 | { | |
1685 | unsigned int i; | |
1686 | ||
1687 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
1688 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1689 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
1690 | ||
1691 | /* Set types up while we still have access to sections. */ | |
1692 | for (i = 0; i < mod->num_symtab; i++) | |
1693 | mod->symtab[i].st_info | |
1694 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
1695 | } | |
1696 | #else | |
1697 | static inline void add_kallsyms(struct module *mod, | |
1698 | Elf_Shdr *sechdrs, | |
1699 | unsigned int symindex, | |
1700 | unsigned int strindex, | |
1701 | const char *secstrings) | |
1702 | { | |
1703 | } | |
1704 | #endif /* CONFIG_KALLSYMS */ | |
1705 | ||
1706 | /* Allocate and load the module: note that size of section 0 is always | |
1707 | zero, and we rely on this for optional sections. */ | |
1708 | static struct module *load_module(void __user *umod, | |
1709 | unsigned long len, | |
1710 | const char __user *uargs) | |
1711 | { | |
1712 | Elf_Ehdr *hdr; | |
1713 | Elf_Shdr *sechdrs; | |
1714 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
84860f99 AM |
1715 | unsigned int i; |
1716 | unsigned int symindex = 0; | |
1717 | unsigned int strindex = 0; | |
1718 | unsigned int setupindex; | |
1719 | unsigned int exindex; | |
1720 | unsigned int exportindex; | |
1721 | unsigned int modindex; | |
1722 | unsigned int obsparmindex; | |
1723 | unsigned int infoindex; | |
1724 | unsigned int gplindex; | |
1725 | unsigned int crcindex; | |
1726 | unsigned int gplcrcindex; | |
1727 | unsigned int versindex; | |
1728 | unsigned int pcpuindex; | |
1729 | unsigned int gplfutureindex; | |
1730 | unsigned int gplfuturecrcindex; | |
1731 | unsigned int unwindex = 0; | |
1732 | unsigned int unusedindex; | |
1733 | unsigned int unusedcrcindex; | |
1734 | unsigned int unusedgplindex; | |
1735 | unsigned int unusedgplcrcindex; | |
8256e47c MD |
1736 | unsigned int markersindex; |
1737 | unsigned int markersstringsindex; | |
1da177e4 LT |
1738 | struct module *mod; |
1739 | long err = 0; | |
1740 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ | |
1741 | struct exception_table_entry *extable; | |
378bac82 | 1742 | mm_segment_t old_fs; |
1da177e4 LT |
1743 | |
1744 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
1745 | umod, len, uargs); | |
1746 | if (len < sizeof(*hdr)) | |
1747 | return ERR_PTR(-ENOEXEC); | |
1748 | ||
1749 | /* Suck in entire file: we'll want most of it. */ | |
1750 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
1751 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
1752 | return ERR_PTR(-ENOMEM); | |
1753 | if (copy_from_user(hdr, umod, len) != 0) { | |
1754 | err = -EFAULT; | |
1755 | goto free_hdr; | |
1756 | } | |
1757 | ||
1758 | /* Sanity checks against insmoding binaries or wrong arch, | |
1759 | weird elf version */ | |
1760 | if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 | |
1761 | || hdr->e_type != ET_REL | |
1762 | || !elf_check_arch(hdr) | |
1763 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
1764 | err = -ENOEXEC; | |
1765 | goto free_hdr; | |
1766 | } | |
1767 | ||
1768 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
1769 | goto truncated; | |
1770 | ||
1771 | /* Convenience variables */ | |
1772 | sechdrs = (void *)hdr + hdr->e_shoff; | |
1773 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
1774 | sechdrs[0].sh_addr = 0; | |
1775 | ||
1776 | for (i = 1; i < hdr->e_shnum; i++) { | |
1777 | if (sechdrs[i].sh_type != SHT_NOBITS | |
1778 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
1779 | goto truncated; | |
1780 | ||
1781 | /* Mark all sections sh_addr with their address in the | |
1782 | temporary image. */ | |
1783 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
1784 | ||
1785 | /* Internal symbols and strings. */ | |
1786 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
1787 | symindex = i; | |
1788 | strindex = sechdrs[i].sh_link; | |
1789 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
1790 | } | |
1791 | #ifndef CONFIG_MODULE_UNLOAD | |
1792 | /* Don't load .exit sections */ | |
1793 | if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) | |
1794 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1795 | #endif | |
1796 | } | |
1797 | ||
1798 | modindex = find_sec(hdr, sechdrs, secstrings, | |
1799 | ".gnu.linkonce.this_module"); | |
1800 | if (!modindex) { | |
1801 | printk(KERN_WARNING "No module found in object\n"); | |
1802 | err = -ENOEXEC; | |
1803 | goto free_hdr; | |
1804 | } | |
1805 | mod = (void *)sechdrs[modindex].sh_addr; | |
1806 | ||
1807 | if (symindex == 0) { | |
1808 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
1809 | mod->name); | |
1810 | err = -ENOEXEC; | |
1811 | goto free_hdr; | |
1812 | } | |
1813 | ||
1814 | /* Optional sections */ | |
1815 | exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); | |
1816 | gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); | |
9f28bb7e | 1817 | gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future"); |
f71d20e9 AV |
1818 | unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused"); |
1819 | unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl"); | |
1da177e4 LT |
1820 | crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); |
1821 | gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
9f28bb7e | 1822 | gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future"); |
f71d20e9 AV |
1823 | unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused"); |
1824 | unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl"); | |
1da177e4 LT |
1825 | setupindex = find_sec(hdr, sechdrs, secstrings, "__param"); |
1826 | exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table"); | |
1827 | obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm"); | |
1828 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); | |
1829 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
1830 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
4552d5dc JB |
1831 | #ifdef ARCH_UNWIND_SECTION_NAME |
1832 | unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME); | |
1833 | #endif | |
1da177e4 | 1834 | |
ea01e798 | 1835 | /* Don't keep modinfo and version sections. */ |
1da177e4 | 1836 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
ea01e798 | 1837 | sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
1838 | #ifdef CONFIG_KALLSYMS |
1839 | /* Keep symbol and string tables for decoding later. */ | |
1840 | sechdrs[symindex].sh_flags |= SHF_ALLOC; | |
1841 | sechdrs[strindex].sh_flags |= SHF_ALLOC; | |
1842 | #endif | |
4552d5dc JB |
1843 | if (unwindex) |
1844 | sechdrs[unwindex].sh_flags |= SHF_ALLOC; | |
1da177e4 LT |
1845 | |
1846 | /* Check module struct version now, before we try to use module. */ | |
1847 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
1848 | err = -ENOEXEC; | |
1849 | goto free_hdr; | |
1850 | } | |
1851 | ||
1852 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
1853 | /* This is allowed: modprobe --force will invalidate it. */ | |
1854 | if (!modmagic) { | |
fa3ba2e8 | 1855 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1da177e4 LT |
1856 | printk(KERN_WARNING "%s: no version magic, tainting kernel.\n", |
1857 | mod->name); | |
1858 | } else if (!same_magic(modmagic, vermagic)) { | |
1859 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", | |
1860 | mod->name, modmagic, vermagic); | |
1861 | err = -ENOEXEC; | |
1862 | goto free_hdr; | |
1863 | } | |
1864 | ||
1865 | /* Now copy in args */ | |
24277dda DA |
1866 | args = strndup_user(uargs, ~0UL >> 1); |
1867 | if (IS_ERR(args)) { | |
1868 | err = PTR_ERR(args); | |
1da177e4 LT |
1869 | goto free_hdr; |
1870 | } | |
8e08b756 | 1871 | |
1da177e4 LT |
1872 | if (find_module(mod->name)) { |
1873 | err = -EEXIST; | |
1874 | goto free_mod; | |
1875 | } | |
1876 | ||
1877 | mod->state = MODULE_STATE_COMING; | |
1878 | ||
1879 | /* Allow arches to frob section contents and sizes. */ | |
1880 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
1881 | if (err < 0) | |
1882 | goto free_mod; | |
1883 | ||
1884 | if (pcpuindex) { | |
1885 | /* We have a special allocation for this section. */ | |
1886 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, | |
842bbaaa RR |
1887 | sechdrs[pcpuindex].sh_addralign, |
1888 | mod->name); | |
1da177e4 LT |
1889 | if (!percpu) { |
1890 | err = -ENOMEM; | |
1891 | goto free_mod; | |
1892 | } | |
1893 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1894 | mod->percpu = percpu; | |
1895 | } | |
1896 | ||
1897 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
1898 | this is done generically; there doesn't appear to be any | |
1899 | special cases for the architectures. */ | |
1900 | layout_sections(mod, hdr, sechdrs, secstrings); | |
1901 | ||
1902 | /* Do the allocs. */ | |
1903 | ptr = module_alloc(mod->core_size); | |
1904 | if (!ptr) { | |
1905 | err = -ENOMEM; | |
1906 | goto free_percpu; | |
1907 | } | |
1908 | memset(ptr, 0, mod->core_size); | |
1909 | mod->module_core = ptr; | |
1910 | ||
1911 | ptr = module_alloc(mod->init_size); | |
1912 | if (!ptr && mod->init_size) { | |
1913 | err = -ENOMEM; | |
1914 | goto free_core; | |
1915 | } | |
1916 | memset(ptr, 0, mod->init_size); | |
1917 | mod->module_init = ptr; | |
1918 | ||
1919 | /* Transfer each section which specifies SHF_ALLOC */ | |
1920 | DEBUGP("final section addresses:\n"); | |
1921 | for (i = 0; i < hdr->e_shnum; i++) { | |
1922 | void *dest; | |
1923 | ||
1924 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1925 | continue; | |
1926 | ||
1927 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
1928 | dest = mod->module_init | |
1929 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
1930 | else | |
1931 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
1932 | ||
1933 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
1934 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
1935 | sechdrs[i].sh_size); | |
1936 | /* Update sh_addr to point to copy in image. */ | |
1937 | sechdrs[i].sh_addr = (unsigned long)dest; | |
1938 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
1939 | } | |
1940 | /* Module has been moved. */ | |
1941 | mod = (void *)sechdrs[modindex].sh_addr; | |
1942 | ||
1943 | /* Now we've moved module, initialize linked lists, etc. */ | |
1944 | module_unload_init(mod); | |
1945 | ||
97c146ef | 1946 | /* add kobject, so we can reference it. */ |
d58ae678 AM |
1947 | err = mod_sysfs_init(mod); |
1948 | if (err) | |
97c146ef | 1949 | goto free_unload; |
270a6c4c | 1950 | |
1da177e4 LT |
1951 | /* Set up license info based on the info section */ |
1952 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
1953 | ||
9b37ccfc PR |
1954 | /* |
1955 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
1956 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
1957 | * using GPL-only symbols it needs. | |
1958 | */ | |
fa3ba2e8 | 1959 | if (strcmp(mod->name, "ndiswrapper") == 0) |
9b37ccfc PR |
1960 | add_taint(TAINT_PROPRIETARY_MODULE); |
1961 | ||
1962 | /* driverloader was caught wrongly pretending to be under GPL */ | |
fa3ba2e8 FM |
1963 | if (strcmp(mod->name, "driverloader") == 0) |
1964 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
9841d61d | 1965 | |
c988d2b2 MD |
1966 | /* Set up MODINFO_ATTR fields */ |
1967 | setup_modinfo(mod, sechdrs, infoindex); | |
c988d2b2 | 1968 | |
1da177e4 LT |
1969 | /* Fix up syms, so that st_value is a pointer to location. */ |
1970 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
1971 | mod); | |
1972 | if (err < 0) | |
1973 | goto cleanup; | |
1974 | ||
1975 | /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ | |
1976 | mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms); | |
1977 | mod->syms = (void *)sechdrs[exportindex].sh_addr; | |
1978 | if (crcindex) | |
1979 | mod->crcs = (void *)sechdrs[crcindex].sh_addr; | |
1980 | mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms); | |
1981 | mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr; | |
1982 | if (gplcrcindex) | |
1983 | mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr; | |
9f28bb7e GKH |
1984 | mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size / |
1985 | sizeof(*mod->gpl_future_syms); | |
f71d20e9 AV |
1986 | mod->num_unused_syms = sechdrs[unusedindex].sh_size / |
1987 | sizeof(*mod->unused_syms); | |
1988 | mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size / | |
1989 | sizeof(*mod->unused_gpl_syms); | |
9f28bb7e GKH |
1990 | mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr; |
1991 | if (gplfuturecrcindex) | |
1992 | mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr; | |
1da177e4 | 1993 | |
f71d20e9 AV |
1994 | mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr; |
1995 | if (unusedcrcindex) | |
1996 | mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr; | |
1997 | mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr; | |
1998 | if (unusedgplcrcindex) | |
4e2d9245 RR |
1999 | mod->unused_gpl_crcs |
2000 | = (void *)sechdrs[unusedgplcrcindex].sh_addr; | |
f71d20e9 | 2001 | |
1da177e4 | 2002 | #ifdef CONFIG_MODVERSIONS |
22a8bdeb | 2003 | if ((mod->num_syms && !crcindex) || |
9f28bb7e | 2004 | (mod->num_gpl_syms && !gplcrcindex) || |
f71d20e9 AV |
2005 | (mod->num_gpl_future_syms && !gplfuturecrcindex) || |
2006 | (mod->num_unused_syms && !unusedcrcindex) || | |
2007 | (mod->num_unused_gpl_syms && !unusedgplcrcindex)) { | |
1da177e4 LT |
2008 | printk(KERN_WARNING "%s: No versions for exported symbols." |
2009 | " Tainting kernel.\n", mod->name); | |
fa3ba2e8 | 2010 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1da177e4 LT |
2011 | } |
2012 | #endif | |
8256e47c MD |
2013 | markersindex = find_sec(hdr, sechdrs, secstrings, "__markers"); |
2014 | markersstringsindex = find_sec(hdr, sechdrs, secstrings, | |
2015 | "__markers_strings"); | |
1da177e4 LT |
2016 | |
2017 | /* Now do relocations. */ | |
2018 | for (i = 1; i < hdr->e_shnum; i++) { | |
2019 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
2020 | unsigned int info = sechdrs[i].sh_info; | |
2021 | ||
2022 | /* Not a valid relocation section? */ | |
2023 | if (info >= hdr->e_shnum) | |
2024 | continue; | |
2025 | ||
2026 | /* Don't bother with non-allocated sections */ | |
2027 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
2028 | continue; | |
2029 | ||
2030 | if (sechdrs[i].sh_type == SHT_REL) | |
2031 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
2032 | else if (sechdrs[i].sh_type == SHT_RELA) | |
2033 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
2034 | mod); | |
2035 | if (err < 0) | |
2036 | goto cleanup; | |
2037 | } | |
8256e47c MD |
2038 | #ifdef CONFIG_MARKERS |
2039 | mod->markers = (void *)sechdrs[markersindex].sh_addr; | |
2040 | mod->num_markers = | |
2041 | sechdrs[markersindex].sh_size / sizeof(*mod->markers); | |
2042 | #endif | |
1da177e4 | 2043 | |
eea8b54d AN |
2044 | /* Find duplicate symbols */ |
2045 | err = verify_export_symbols(mod); | |
2046 | ||
2047 | if (err < 0) | |
2048 | goto cleanup; | |
2049 | ||
1da177e4 LT |
2050 | /* Set up and sort exception table */ |
2051 | mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable); | |
2052 | mod->extable = extable = (void *)sechdrs[exindex].sh_addr; | |
2053 | sort_extable(extable, extable + mod->num_exentries); | |
2054 | ||
2055 | /* Finally, copy percpu area over. */ | |
2056 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, | |
2057 | sechdrs[pcpuindex].sh_size); | |
2058 | ||
2059 | add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); | |
2060 | ||
8256e47c MD |
2061 | #ifdef CONFIG_MARKERS |
2062 | if (!mod->taints) | |
2063 | marker_update_probe_range(mod->markers, | |
fb40bd78 | 2064 | mod->markers + mod->num_markers); |
8256e47c | 2065 | #endif |
1da177e4 LT |
2066 | err = module_finalize(hdr, sechdrs, mod); |
2067 | if (err < 0) | |
2068 | goto cleanup; | |
2069 | ||
378bac82 TK |
2070 | /* flush the icache in correct context */ |
2071 | old_fs = get_fs(); | |
2072 | set_fs(KERNEL_DS); | |
2073 | ||
2074 | /* | |
2075 | * Flush the instruction cache, since we've played with text. | |
2076 | * Do it before processing of module parameters, so the module | |
2077 | * can provide parameter accessor functions of its own. | |
2078 | */ | |
2079 | if (mod->module_init) | |
2080 | flush_icache_range((unsigned long)mod->module_init, | |
2081 | (unsigned long)mod->module_init | |
2082 | + mod->init_size); | |
2083 | flush_icache_range((unsigned long)mod->module_core, | |
2084 | (unsigned long)mod->module_core + mod->core_size); | |
2085 | ||
2086 | set_fs(old_fs); | |
2087 | ||
1da177e4 | 2088 | mod->args = args; |
8d3b33f6 RR |
2089 | if (obsparmindex) |
2090 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", | |
2091 | mod->name); | |
2092 | ||
bb9d3d56 RR |
2093 | /* Now sew it into the lists so we can get lockdep and oops |
2094 | * info during argument parsing. Noone should access us, since | |
2095 | * strong_try_module_get() will fail. */ | |
2096 | stop_machine_run(__link_module, mod, NR_CPUS); | |
2097 | ||
8d3b33f6 RR |
2098 | /* Size of section 0 is 0, so this works well if no params */ |
2099 | err = parse_args(mod->name, mod->args, | |
2100 | (struct kernel_param *) | |
2101 | sechdrs[setupindex].sh_addr, | |
2102 | sechdrs[setupindex].sh_size | |
2103 | / sizeof(struct kernel_param), | |
2104 | NULL); | |
1da177e4 | 2105 | if (err < 0) |
bb9d3d56 | 2106 | goto unlink; |
1da177e4 | 2107 | |
22a8bdeb | 2108 | err = mod_sysfs_setup(mod, |
1da177e4 LT |
2109 | (struct kernel_param *) |
2110 | sechdrs[setupindex].sh_addr, | |
2111 | sechdrs[setupindex].sh_size | |
2112 | / sizeof(struct kernel_param)); | |
2113 | if (err < 0) | |
bb9d3d56 | 2114 | goto unlink; |
1da177e4 | 2115 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
6d760133 | 2116 | add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
1da177e4 | 2117 | |
4552d5dc JB |
2118 | /* Size of section 0 is 0, so this works well if no unwind info. */ |
2119 | mod->unwind_info = unwind_add_table(mod, | |
22a8bdeb DW |
2120 | (void *)sechdrs[unwindex].sh_addr, |
2121 | sechdrs[unwindex].sh_size); | |
4552d5dc | 2122 | |
1da177e4 LT |
2123 | /* Get rid of temporary copy */ |
2124 | vfree(hdr); | |
2125 | ||
2126 | /* Done! */ | |
2127 | return mod; | |
2128 | ||
bb9d3d56 RR |
2129 | unlink: |
2130 | stop_machine_run(__unlink_module, mod, NR_CPUS); | |
1da177e4 LT |
2131 | module_arch_cleanup(mod); |
2132 | cleanup: | |
97c146ef KS |
2133 | kobject_del(&mod->mkobj.kobj); |
2134 | kobject_put(&mod->mkobj.kobj); | |
2135 | free_unload: | |
1da177e4 LT |
2136 | module_unload_free(mod); |
2137 | module_free(mod, mod->module_init); | |
2138 | free_core: | |
2139 | module_free(mod, mod->module_core); | |
2140 | free_percpu: | |
2141 | if (percpu) | |
2142 | percpu_modfree(percpu); | |
2143 | free_mod: | |
2144 | kfree(args); | |
2145 | free_hdr: | |
2146 | vfree(hdr); | |
6fe2e70b | 2147 | return ERR_PTR(err); |
1da177e4 LT |
2148 | |
2149 | truncated: | |
2150 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
2151 | err = -ENOEXEC; | |
2152 | goto free_hdr; | |
2153 | } | |
2154 | ||
1da177e4 LT |
2155 | /* This is where the real work happens */ |
2156 | asmlinkage long | |
2157 | sys_init_module(void __user *umod, | |
2158 | unsigned long len, | |
2159 | const char __user *uargs) | |
2160 | { | |
2161 | struct module *mod; | |
2162 | int ret = 0; | |
2163 | ||
2164 | /* Must have permission */ | |
2165 | if (!capable(CAP_SYS_MODULE)) | |
2166 | return -EPERM; | |
2167 | ||
2168 | /* Only one module load at a time, please */ | |
6389a385 | 2169 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
2170 | return -EINTR; |
2171 | ||
2172 | /* Do all the hard work */ | |
2173 | mod = load_module(umod, len, uargs); | |
2174 | if (IS_ERR(mod)) { | |
6389a385 | 2175 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2176 | return PTR_ERR(mod); |
2177 | } | |
2178 | ||
1da177e4 | 2179 | /* Drop lock so they can recurse */ |
6389a385 | 2180 | mutex_unlock(&module_mutex); |
1da177e4 | 2181 | |
e041c683 AS |
2182 | blocking_notifier_call_chain(&module_notify_list, |
2183 | MODULE_STATE_COMING, mod); | |
1da177e4 LT |
2184 | |
2185 | /* Start the module */ | |
2186 | if (mod->init != NULL) | |
2187 | ret = mod->init(); | |
2188 | if (ret < 0) { | |
2189 | /* Init routine failed: abort. Try to protect us from | |
2190 | buggy refcounters. */ | |
2191 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2192 | synchronize_sched(); |
af49d924 RR |
2193 | module_put(mod); |
2194 | mutex_lock(&module_mutex); | |
2195 | free_module(mod); | |
2196 | mutex_unlock(&module_mutex); | |
c9a3ba55 | 2197 | wake_up(&module_wq); |
1da177e4 LT |
2198 | return ret; |
2199 | } | |
e24e2e64 AD |
2200 | if (ret > 0) { |
2201 | printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, " | |
2202 | "it should follow 0/-E convention\n" | |
2203 | KERN_WARNING "%s: loading module anyway...\n", | |
2204 | __func__, mod->name, ret, | |
2205 | __func__); | |
2206 | dump_stack(); | |
2207 | } | |
1da177e4 | 2208 | |
6c5db22d | 2209 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 2210 | mod->state = MODULE_STATE_LIVE; |
6c5db22d RR |
2211 | wake_up(&module_wq); |
2212 | ||
2213 | mutex_lock(&module_mutex); | |
1da177e4 LT |
2214 | /* Drop initial reference. */ |
2215 | module_put(mod); | |
4552d5dc | 2216 | unwind_remove_table(mod->unwind_info, 1); |
1da177e4 LT |
2217 | module_free(mod, mod->module_init); |
2218 | mod->module_init = NULL; | |
2219 | mod->init_size = 0; | |
2220 | mod->init_text_size = 0; | |
6389a385 | 2221 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2222 | |
2223 | return 0; | |
2224 | } | |
2225 | ||
2226 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2227 | { | |
2228 | return ((void *)addr >= start && (void *)addr < start + size); | |
2229 | } | |
2230 | ||
2231 | #ifdef CONFIG_KALLSYMS | |
2232 | /* | |
2233 | * This ignores the intensely annoying "mapping symbols" found | |
2234 | * in ARM ELF files: $a, $t and $d. | |
2235 | */ | |
2236 | static inline int is_arm_mapping_symbol(const char *str) | |
2237 | { | |
22a8bdeb | 2238 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2239 | && (str[2] == '\0' || str[2] == '.'); |
2240 | } | |
2241 | ||
2242 | static const char *get_ksymbol(struct module *mod, | |
2243 | unsigned long addr, | |
2244 | unsigned long *size, | |
2245 | unsigned long *offset) | |
2246 | { | |
2247 | unsigned int i, best = 0; | |
2248 | unsigned long nextval; | |
2249 | ||
2250 | /* At worse, next value is at end of module */ | |
2251 | if (within(addr, mod->module_init, mod->init_size)) | |
2252 | nextval = (unsigned long)mod->module_init+mod->init_text_size; | |
22a8bdeb | 2253 | else |
1da177e4 LT |
2254 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2255 | ||
2256 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
22a8bdeb | 2257 | starts real symbols at 1). */ |
1da177e4 LT |
2258 | for (i = 1; i < mod->num_symtab; i++) { |
2259 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2260 | continue; | |
2261 | ||
2262 | /* We ignore unnamed symbols: they're uninformative | |
2263 | * and inserted at a whim. */ | |
2264 | if (mod->symtab[i].st_value <= addr | |
2265 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2266 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2267 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2268 | best = i; | |
2269 | if (mod->symtab[i].st_value > addr | |
2270 | && mod->symtab[i].st_value < nextval | |
2271 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2272 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2273 | nextval = mod->symtab[i].st_value; | |
2274 | } | |
2275 | ||
2276 | if (!best) | |
2277 | return NULL; | |
2278 | ||
ffb45122 AD |
2279 | if (size) |
2280 | *size = nextval - mod->symtab[best].st_value; | |
2281 | if (offset) | |
2282 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2283 | return mod->strtab + mod->symtab[best].st_name; |
2284 | } | |
2285 | ||
6dd06c9f RR |
2286 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2287 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 2288 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
2289 | unsigned long *size, |
2290 | unsigned long *offset, | |
2291 | char **modname, | |
2292 | char *namebuf) | |
1da177e4 LT |
2293 | { |
2294 | struct module *mod; | |
cb2a5205 | 2295 | const char *ret = NULL; |
1da177e4 | 2296 | |
cb2a5205 | 2297 | preempt_disable(); |
1da177e4 LT |
2298 | list_for_each_entry(mod, &modules, list) { |
2299 | if (within(addr, mod->module_init, mod->init_size) | |
2300 | || within(addr, mod->module_core, mod->core_size)) { | |
ffc50891 FBH |
2301 | if (modname) |
2302 | *modname = mod->name; | |
cb2a5205 RR |
2303 | ret = get_ksymbol(mod, addr, size, offset); |
2304 | break; | |
1da177e4 LT |
2305 | } |
2306 | } | |
6dd06c9f RR |
2307 | /* Make a copy in here where it's safe */ |
2308 | if (ret) { | |
2309 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
2310 | ret = namebuf; | |
2311 | } | |
cb2a5205 | 2312 | preempt_enable(); |
92dfc9dc | 2313 | return ret; |
1da177e4 LT |
2314 | } |
2315 | ||
9d65cb4a AD |
2316 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2317 | { | |
2318 | struct module *mod; | |
2319 | ||
cb2a5205 | 2320 | preempt_disable(); |
9d65cb4a AD |
2321 | list_for_each_entry(mod, &modules, list) { |
2322 | if (within(addr, mod->module_init, mod->init_size) || | |
2323 | within(addr, mod->module_core, mod->core_size)) { | |
2324 | const char *sym; | |
2325 | ||
2326 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2327 | if (!sym) | |
2328 | goto out; | |
9281acea | 2329 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 2330 | preempt_enable(); |
9d65cb4a AD |
2331 | return 0; |
2332 | } | |
2333 | } | |
2334 | out: | |
cb2a5205 | 2335 | preempt_enable(); |
9d65cb4a AD |
2336 | return -ERANGE; |
2337 | } | |
2338 | ||
a5c43dae AD |
2339 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2340 | unsigned long *offset, char *modname, char *name) | |
2341 | { | |
2342 | struct module *mod; | |
2343 | ||
cb2a5205 | 2344 | preempt_disable(); |
a5c43dae AD |
2345 | list_for_each_entry(mod, &modules, list) { |
2346 | if (within(addr, mod->module_init, mod->init_size) || | |
2347 | within(addr, mod->module_core, mod->core_size)) { | |
2348 | const char *sym; | |
2349 | ||
2350 | sym = get_ksymbol(mod, addr, size, offset); | |
2351 | if (!sym) | |
2352 | goto out; | |
2353 | if (modname) | |
9281acea | 2354 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 2355 | if (name) |
9281acea | 2356 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 2357 | preempt_enable(); |
a5c43dae AD |
2358 | return 0; |
2359 | } | |
2360 | } | |
2361 | out: | |
cb2a5205 | 2362 | preempt_enable(); |
a5c43dae AD |
2363 | return -ERANGE; |
2364 | } | |
2365 | ||
ea07890a AD |
2366 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2367 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2368 | { |
2369 | struct module *mod; | |
2370 | ||
cb2a5205 | 2371 | preempt_disable(); |
1da177e4 LT |
2372 | list_for_each_entry(mod, &modules, list) { |
2373 | if (symnum < mod->num_symtab) { | |
2374 | *value = mod->symtab[symnum].st_value; | |
2375 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2376 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
2377 | KSYM_NAME_LEN); |
2378 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ea07890a | 2379 | *exported = is_exported(name, mod); |
cb2a5205 | 2380 | preempt_enable(); |
ea07890a | 2381 | return 0; |
1da177e4 LT |
2382 | } |
2383 | symnum -= mod->num_symtab; | |
2384 | } | |
cb2a5205 | 2385 | preempt_enable(); |
ea07890a | 2386 | return -ERANGE; |
1da177e4 LT |
2387 | } |
2388 | ||
2389 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2390 | { | |
2391 | unsigned int i; | |
2392 | ||
2393 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2394 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2395 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2396 | return mod->symtab[i].st_value; |
2397 | return 0; | |
2398 | } | |
2399 | ||
2400 | /* Look for this name: can be of form module:name. */ | |
2401 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2402 | { | |
2403 | struct module *mod; | |
2404 | char *colon; | |
2405 | unsigned long ret = 0; | |
2406 | ||
2407 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 2408 | preempt_disable(); |
1da177e4 LT |
2409 | if ((colon = strchr(name, ':')) != NULL) { |
2410 | *colon = '\0'; | |
2411 | if ((mod = find_module(name)) != NULL) | |
2412 | ret = mod_find_symname(mod, colon+1); | |
2413 | *colon = ':'; | |
2414 | } else { | |
2415 | list_for_each_entry(mod, &modules, list) | |
2416 | if ((ret = mod_find_symname(mod, name)) != 0) | |
2417 | break; | |
2418 | } | |
cb2a5205 | 2419 | preempt_enable(); |
1da177e4 LT |
2420 | return ret; |
2421 | } | |
2422 | #endif /* CONFIG_KALLSYMS */ | |
2423 | ||
2424 | /* Called by the /proc file system to return a list of modules. */ | |
2425 | static void *m_start(struct seq_file *m, loff_t *pos) | |
2426 | { | |
6389a385 | 2427 | mutex_lock(&module_mutex); |
708f4b52 | 2428 | return seq_list_start(&modules, *pos); |
1da177e4 LT |
2429 | } |
2430 | ||
2431 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
2432 | { | |
708f4b52 | 2433 | return seq_list_next(p, &modules, pos); |
1da177e4 LT |
2434 | } |
2435 | ||
2436 | static void m_stop(struct seq_file *m, void *p) | |
2437 | { | |
6389a385 | 2438 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2439 | } |
2440 | ||
21aa9280 | 2441 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
2442 | { |
2443 | int bx = 0; | |
2444 | ||
21aa9280 AV |
2445 | if (mod->taints || |
2446 | mod->state == MODULE_STATE_GOING || | |
2447 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 2448 | buf[bx++] = '('; |
21aa9280 | 2449 | if (mod->taints & TAINT_PROPRIETARY_MODULE) |
fa3ba2e8 | 2450 | buf[bx++] = 'P'; |
21aa9280 | 2451 | if (mod->taints & TAINT_FORCED_MODULE) |
fa3ba2e8 FM |
2452 | buf[bx++] = 'F'; |
2453 | /* | |
2454 | * TAINT_FORCED_RMMOD: could be added. | |
2455 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
2456 | * apply to modules. | |
2457 | */ | |
21aa9280 AV |
2458 | |
2459 | /* Show a - for module-is-being-unloaded */ | |
2460 | if (mod->state == MODULE_STATE_GOING) | |
2461 | buf[bx++] = '-'; | |
2462 | /* Show a + for module-is-being-loaded */ | |
2463 | if (mod->state == MODULE_STATE_COMING) | |
2464 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
2465 | buf[bx++] = ')'; |
2466 | } | |
2467 | buf[bx] = '\0'; | |
2468 | ||
2469 | return buf; | |
2470 | } | |
2471 | ||
1da177e4 LT |
2472 | static int m_show(struct seq_file *m, void *p) |
2473 | { | |
2474 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
2475 | char buf[8]; |
2476 | ||
1da177e4 LT |
2477 | seq_printf(m, "%s %lu", |
2478 | mod->name, mod->init_size + mod->core_size); | |
2479 | print_unload_info(m, mod); | |
2480 | ||
2481 | /* Informative for users. */ | |
2482 | seq_printf(m, " %s", | |
2483 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2484 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2485 | "Live"); | |
2486 | /* Used by oprofile and other similar tools. */ | |
2487 | seq_printf(m, " 0x%p", mod->module_core); | |
2488 | ||
fa3ba2e8 FM |
2489 | /* Taints info */ |
2490 | if (mod->taints) | |
21aa9280 | 2491 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 2492 | |
1da177e4 LT |
2493 | seq_printf(m, "\n"); |
2494 | return 0; | |
2495 | } | |
2496 | ||
2497 | /* Format: modulename size refcount deps address | |
2498 | ||
2499 | Where refcount is a number or -, and deps is a comma-separated list | |
2500 | of depends or -. | |
2501 | */ | |
15ad7cdc | 2502 | const struct seq_operations modules_op = { |
1da177e4 LT |
2503 | .start = m_start, |
2504 | .next = m_next, | |
2505 | .stop = m_stop, | |
2506 | .show = m_show | |
2507 | }; | |
2508 | ||
2509 | /* Given an address, look for it in the module exception tables. */ | |
2510 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2511 | { | |
1da177e4 LT |
2512 | const struct exception_table_entry *e = NULL; |
2513 | struct module *mod; | |
2514 | ||
24da1cbf | 2515 | preempt_disable(); |
1da177e4 LT |
2516 | list_for_each_entry(mod, &modules, list) { |
2517 | if (mod->num_exentries == 0) | |
2518 | continue; | |
22a8bdeb | 2519 | |
1da177e4 LT |
2520 | e = search_extable(mod->extable, |
2521 | mod->extable + mod->num_exentries - 1, | |
2522 | addr); | |
2523 | if (e) | |
2524 | break; | |
2525 | } | |
24da1cbf | 2526 | preempt_enable(); |
1da177e4 LT |
2527 | |
2528 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 2529 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
2530 | return e; |
2531 | } | |
2532 | ||
4d435f9d IM |
2533 | /* |
2534 | * Is this a valid module address? | |
2535 | */ | |
2536 | int is_module_address(unsigned long addr) | |
2537 | { | |
4d435f9d IM |
2538 | struct module *mod; |
2539 | ||
24da1cbf | 2540 | preempt_disable(); |
4d435f9d IM |
2541 | |
2542 | list_for_each_entry(mod, &modules, list) { | |
2543 | if (within(addr, mod->module_core, mod->core_size)) { | |
24da1cbf | 2544 | preempt_enable(); |
4d435f9d IM |
2545 | return 1; |
2546 | } | |
2547 | } | |
2548 | ||
24da1cbf | 2549 | preempt_enable(); |
4d435f9d IM |
2550 | |
2551 | return 0; | |
2552 | } | |
2553 | ||
2554 | ||
24da1cbf | 2555 | /* Is this a valid kernel address? */ |
1da177e4 LT |
2556 | struct module *__module_text_address(unsigned long addr) |
2557 | { | |
2558 | struct module *mod; | |
2559 | ||
2560 | list_for_each_entry(mod, &modules, list) | |
2561 | if (within(addr, mod->module_init, mod->init_text_size) | |
2562 | || within(addr, mod->module_core, mod->core_text_size)) | |
2563 | return mod; | |
2564 | return NULL; | |
2565 | } | |
2566 | ||
2567 | struct module *module_text_address(unsigned long addr) | |
2568 | { | |
2569 | struct module *mod; | |
1da177e4 | 2570 | |
24da1cbf | 2571 | preempt_disable(); |
1da177e4 | 2572 | mod = __module_text_address(addr); |
24da1cbf | 2573 | preempt_enable(); |
1da177e4 LT |
2574 | |
2575 | return mod; | |
2576 | } | |
2577 | ||
2578 | /* Don't grab lock, we're oopsing. */ | |
2579 | void print_modules(void) | |
2580 | { | |
2581 | struct module *mod; | |
2bc2d61a | 2582 | char buf[8]; |
1da177e4 LT |
2583 | |
2584 | printk("Modules linked in:"); | |
2585 | list_for_each_entry(mod, &modules, list) | |
21aa9280 | 2586 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
e14af7ee AV |
2587 | if (last_unloaded_module[0]) |
2588 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
2589 | printk("\n"); |
2590 | } | |
2591 | ||
1da177e4 LT |
2592 | #ifdef CONFIG_MODVERSIONS |
2593 | /* Generate the signature for struct module here, too, for modversions. */ | |
2594 | void struct_module(struct module *mod) { return; } | |
2595 | EXPORT_SYMBOL(struct_module); | |
2596 | #endif | |
8256e47c MD |
2597 | |
2598 | #ifdef CONFIG_MARKERS | |
fb40bd78 | 2599 | void module_update_markers(void) |
8256e47c MD |
2600 | { |
2601 | struct module *mod; | |
2602 | ||
2603 | mutex_lock(&module_mutex); | |
2604 | list_for_each_entry(mod, &modules, list) | |
2605 | if (!mod->taints) | |
2606 | marker_update_probe_range(mod->markers, | |
fb40bd78 | 2607 | mod->markers + mod->num_markers); |
8256e47c MD |
2608 | mutex_unlock(&module_mutex); |
2609 | } | |
2610 | #endif |