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Commit | Line | Data |
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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 LT |
45 | #include <asm/uaccess.h> |
46 | #include <asm/semaphore.h> | |
47 | #include <asm/cacheflush.h> | |
b817f6fe | 48 | #include <linux/license.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 | ||
f71d20e9 AV |
167 | static void printk_unused_warning(const char *name) |
168 | { | |
169 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
170 | "however this module is using it.\n", name); | |
171 | printk(KERN_WARNING "This symbol will go away in the future.\n"); | |
172 | printk(KERN_WARNING "Please evalute if this is the right api to use, " | |
173 | "and if it really is, submit a report the linux kernel " | |
174 | "mailinglist together with submitting your code for " | |
175 | "inclusion.\n"); | |
176 | } | |
177 | ||
1da177e4 LT |
178 | /* Find a symbol, return value, crc and module which owns it */ |
179 | static unsigned long __find_symbol(const char *name, | |
180 | struct module **owner, | |
181 | const unsigned long **crc, | |
182 | int gplok) | |
183 | { | |
184 | struct module *mod; | |
3fd6805f | 185 | const struct kernel_symbol *ks; |
1da177e4 | 186 | |
22a8bdeb | 187 | /* Core kernel first. */ |
1da177e4 | 188 | *owner = NULL; |
3fd6805f SR |
189 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
190 | if (ks) { | |
191 | *crc = symversion(__start___kcrctab, (ks - __start___ksymtab)); | |
192 | return ks->value; | |
1da177e4 LT |
193 | } |
194 | if (gplok) { | |
3fd6805f SR |
195 | ks = lookup_symbol(name, __start___ksymtab_gpl, |
196 | __stop___ksymtab_gpl); | |
197 | if (ks) { | |
198 | *crc = symversion(__start___kcrctab_gpl, | |
199 | (ks - __start___ksymtab_gpl)); | |
200 | return ks->value; | |
201 | } | |
1da177e4 | 202 | } |
9f28bb7e GKH |
203 | ks = lookup_symbol(name, __start___ksymtab_gpl_future, |
204 | __stop___ksymtab_gpl_future); | |
205 | if (ks) { | |
206 | if (!gplok) { | |
207 | printk(KERN_WARNING "Symbol %s is being used " | |
208 | "by a non-GPL module, which will not " | |
209 | "be allowed in the future\n", name); | |
210 | printk(KERN_WARNING "Please see the file " | |
211 | "Documentation/feature-removal-schedule.txt " | |
212 | "in the kernel source tree for more " | |
213 | "details.\n"); | |
214 | } | |
215 | *crc = symversion(__start___kcrctab_gpl_future, | |
216 | (ks - __start___ksymtab_gpl_future)); | |
217 | return ks->value; | |
218 | } | |
1da177e4 | 219 | |
f71d20e9 AV |
220 | ks = lookup_symbol(name, __start___ksymtab_unused, |
221 | __stop___ksymtab_unused); | |
222 | if (ks) { | |
223 | printk_unused_warning(name); | |
224 | *crc = symversion(__start___kcrctab_unused, | |
225 | (ks - __start___ksymtab_unused)); | |
226 | return ks->value; | |
227 | } | |
228 | ||
229 | if (gplok) | |
230 | ks = lookup_symbol(name, __start___ksymtab_unused_gpl, | |
231 | __stop___ksymtab_unused_gpl); | |
232 | if (ks) { | |
233 | printk_unused_warning(name); | |
234 | *crc = symversion(__start___kcrctab_unused_gpl, | |
235 | (ks - __start___ksymtab_unused_gpl)); | |
236 | return ks->value; | |
237 | } | |
238 | ||
22a8bdeb | 239 | /* Now try modules. */ |
1da177e4 LT |
240 | list_for_each_entry(mod, &modules, list) { |
241 | *owner = mod; | |
3fd6805f SR |
242 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
243 | if (ks) { | |
244 | *crc = symversion(mod->crcs, (ks - mod->syms)); | |
245 | return ks->value; | |
246 | } | |
1da177e4 LT |
247 | |
248 | if (gplok) { | |
3fd6805f SR |
249 | ks = lookup_symbol(name, mod->gpl_syms, |
250 | mod->gpl_syms + mod->num_gpl_syms); | |
251 | if (ks) { | |
252 | *crc = symversion(mod->gpl_crcs, | |
253 | (ks - mod->gpl_syms)); | |
254 | return ks->value; | |
1da177e4 LT |
255 | } |
256 | } | |
f71d20e9 AV |
257 | ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms); |
258 | if (ks) { | |
259 | printk_unused_warning(name); | |
260 | *crc = symversion(mod->unused_crcs, (ks - mod->unused_syms)); | |
261 | return ks->value; | |
262 | } | |
263 | ||
264 | if (gplok) { | |
265 | ks = lookup_symbol(name, mod->unused_gpl_syms, | |
266 | mod->unused_gpl_syms + mod->num_unused_gpl_syms); | |
267 | if (ks) { | |
268 | printk_unused_warning(name); | |
269 | *crc = symversion(mod->unused_gpl_crcs, | |
270 | (ks - mod->unused_gpl_syms)); | |
271 | return ks->value; | |
272 | } | |
273 | } | |
9f28bb7e GKH |
274 | ks = lookup_symbol(name, mod->gpl_future_syms, |
275 | (mod->gpl_future_syms + | |
276 | mod->num_gpl_future_syms)); | |
277 | if (ks) { | |
278 | if (!gplok) { | |
279 | printk(KERN_WARNING "Symbol %s is being used " | |
280 | "by a non-GPL module, which will not " | |
281 | "be allowed in the future\n", name); | |
282 | printk(KERN_WARNING "Please see the file " | |
283 | "Documentation/feature-removal-schedule.txt " | |
284 | "in the kernel source tree for more " | |
285 | "details.\n"); | |
286 | } | |
287 | *crc = symversion(mod->gpl_future_crcs, | |
288 | (ks - mod->gpl_future_syms)); | |
289 | return ks->value; | |
290 | } | |
1da177e4 LT |
291 | } |
292 | DEBUGP("Failed to find symbol %s\n", name); | |
22a8bdeb | 293 | return 0; |
1da177e4 LT |
294 | } |
295 | ||
1da177e4 LT |
296 | /* Search for module by name: must hold module_mutex. */ |
297 | static struct module *find_module(const char *name) | |
298 | { | |
299 | struct module *mod; | |
300 | ||
301 | list_for_each_entry(mod, &modules, list) { | |
302 | if (strcmp(mod->name, name) == 0) | |
303 | return mod; | |
304 | } | |
305 | return NULL; | |
306 | } | |
307 | ||
308 | #ifdef CONFIG_SMP | |
309 | /* Number of blocks used and allocated. */ | |
310 | static unsigned int pcpu_num_used, pcpu_num_allocated; | |
311 | /* Size of each block. -ve means used. */ | |
312 | static int *pcpu_size; | |
313 | ||
314 | static int split_block(unsigned int i, unsigned short size) | |
315 | { | |
316 | /* Reallocation required? */ | |
317 | if (pcpu_num_used + 1 > pcpu_num_allocated) { | |
6d4f9c55 PE |
318 | int *new; |
319 | ||
320 | new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, | |
321 | GFP_KERNEL); | |
1da177e4 LT |
322 | if (!new) |
323 | return 0; | |
324 | ||
1da177e4 | 325 | pcpu_num_allocated *= 2; |
1da177e4 LT |
326 | pcpu_size = new; |
327 | } | |
328 | ||
329 | /* Insert a new subblock */ | |
330 | memmove(&pcpu_size[i+1], &pcpu_size[i], | |
331 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); | |
332 | pcpu_num_used++; | |
333 | ||
334 | pcpu_size[i+1] -= size; | |
335 | pcpu_size[i] = size; | |
336 | return 1; | |
337 | } | |
338 | ||
339 | static inline unsigned int block_size(int val) | |
340 | { | |
341 | if (val < 0) | |
342 | return -val; | |
343 | return val; | |
344 | } | |
345 | ||
346 | /* Created by linker magic */ | |
347 | extern char __per_cpu_start[], __per_cpu_end[]; | |
348 | ||
842bbaaa RR |
349 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
350 | const char *name) | |
1da177e4 LT |
351 | { |
352 | unsigned long extra; | |
353 | unsigned int i; | |
354 | void *ptr; | |
355 | ||
b6e3590f JF |
356 | if (align > PAGE_SIZE) { |
357 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
358 | name, align, PAGE_SIZE); | |
359 | align = PAGE_SIZE; | |
842bbaaa | 360 | } |
1da177e4 LT |
361 | |
362 | ptr = __per_cpu_start; | |
363 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
364 | /* Extra for alignment requirement. */ | |
365 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; | |
366 | BUG_ON(i == 0 && extra != 0); | |
367 | ||
368 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) | |
369 | continue; | |
370 | ||
371 | /* Transfer extra to previous block. */ | |
372 | if (pcpu_size[i-1] < 0) | |
373 | pcpu_size[i-1] -= extra; | |
374 | else | |
375 | pcpu_size[i-1] += extra; | |
376 | pcpu_size[i] -= extra; | |
377 | ptr += extra; | |
378 | ||
379 | /* Split block if warranted */ | |
380 | if (pcpu_size[i] - size > sizeof(unsigned long)) | |
381 | if (!split_block(i, size)) | |
382 | return NULL; | |
383 | ||
384 | /* Mark allocated */ | |
385 | pcpu_size[i] = -pcpu_size[i]; | |
386 | return ptr; | |
387 | } | |
388 | ||
389 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", | |
390 | size); | |
391 | return NULL; | |
392 | } | |
393 | ||
394 | static void percpu_modfree(void *freeme) | |
395 | { | |
396 | unsigned int i; | |
397 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); | |
398 | ||
399 | /* First entry is core kernel percpu data. */ | |
400 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
401 | if (ptr == freeme) { | |
402 | pcpu_size[i] = -pcpu_size[i]; | |
403 | goto free; | |
404 | } | |
405 | } | |
406 | BUG(); | |
407 | ||
408 | free: | |
409 | /* Merge with previous? */ | |
410 | if (pcpu_size[i-1] >= 0) { | |
411 | pcpu_size[i-1] += pcpu_size[i]; | |
412 | pcpu_num_used--; | |
413 | memmove(&pcpu_size[i], &pcpu_size[i+1], | |
414 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); | |
415 | i--; | |
416 | } | |
417 | /* Merge with next? */ | |
418 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { | |
419 | pcpu_size[i] += pcpu_size[i+1]; | |
420 | pcpu_num_used--; | |
421 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], | |
422 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); | |
423 | } | |
424 | } | |
425 | ||
426 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
427 | Elf_Shdr *sechdrs, | |
428 | const char *secstrings) | |
429 | { | |
430 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); | |
431 | } | |
432 | ||
433 | static int percpu_modinit(void) | |
434 | { | |
435 | pcpu_num_used = 2; | |
436 | pcpu_num_allocated = 2; | |
437 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, | |
438 | GFP_KERNEL); | |
439 | /* Static in-kernel percpu data (used). */ | |
b00742d3 | 440 | pcpu_size[0] = -(__per_cpu_end-__per_cpu_start); |
1da177e4 LT |
441 | /* Free room. */ |
442 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; | |
443 | if (pcpu_size[1] < 0) { | |
444 | printk(KERN_ERR "No per-cpu room for modules.\n"); | |
445 | pcpu_num_used = 1; | |
446 | } | |
447 | ||
448 | return 0; | |
22a8bdeb | 449 | } |
1da177e4 LT |
450 | __initcall(percpu_modinit); |
451 | #else /* ... !CONFIG_SMP */ | |
842bbaaa RR |
452 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
453 | const char *name) | |
1da177e4 LT |
454 | { |
455 | return NULL; | |
456 | } | |
457 | static inline void percpu_modfree(void *pcpuptr) | |
458 | { | |
459 | BUG(); | |
460 | } | |
461 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
462 | Elf_Shdr *sechdrs, | |
463 | const char *secstrings) | |
464 | { | |
465 | return 0; | |
466 | } | |
467 | static inline void percpu_modcopy(void *pcpudst, const void *src, | |
468 | unsigned long size) | |
469 | { | |
470 | /* pcpusec should be 0, and size of that section should be 0. */ | |
471 | BUG_ON(size != 0); | |
472 | } | |
473 | #endif /* CONFIG_SMP */ | |
474 | ||
c988d2b2 MD |
475 | #define MODINFO_ATTR(field) \ |
476 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
477 | { \ | |
478 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
479 | } \ | |
480 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
481 | struct module *mod, char *buffer) \ | |
482 | { \ | |
483 | return sprintf(buffer, "%s\n", mod->field); \ | |
484 | } \ | |
485 | static int modinfo_##field##_exists(struct module *mod) \ | |
486 | { \ | |
487 | return mod->field != NULL; \ | |
488 | } \ | |
489 | static void free_modinfo_##field(struct module *mod) \ | |
490 | { \ | |
22a8bdeb DW |
491 | kfree(mod->field); \ |
492 | mod->field = NULL; \ | |
c988d2b2 MD |
493 | } \ |
494 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 495 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
496 | .show = show_modinfo_##field, \ |
497 | .setup = setup_modinfo_##field, \ | |
498 | .test = modinfo_##field##_exists, \ | |
499 | .free = free_modinfo_##field, \ | |
500 | }; | |
501 | ||
502 | MODINFO_ATTR(version); | |
503 | MODINFO_ATTR(srcversion); | |
504 | ||
e14af7ee AV |
505 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
506 | ||
03e88ae1 | 507 | #ifdef CONFIG_MODULE_UNLOAD |
1da177e4 LT |
508 | /* Init the unload section of the module. */ |
509 | static void module_unload_init(struct module *mod) | |
510 | { | |
511 | unsigned int i; | |
512 | ||
513 | INIT_LIST_HEAD(&mod->modules_which_use_me); | |
514 | for (i = 0; i < NR_CPUS; i++) | |
515 | local_set(&mod->ref[i].count, 0); | |
516 | /* Hold reference count during initialization. */ | |
39c715b7 | 517 | local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
1da177e4 LT |
518 | /* Backwards compatibility macros put refcount during init. */ |
519 | mod->waiter = current; | |
520 | } | |
521 | ||
522 | /* modules using other modules */ | |
523 | struct module_use | |
524 | { | |
525 | struct list_head list; | |
526 | struct module *module_which_uses; | |
527 | }; | |
528 | ||
529 | /* Does a already use b? */ | |
530 | static int already_uses(struct module *a, struct module *b) | |
531 | { | |
532 | struct module_use *use; | |
533 | ||
534 | list_for_each_entry(use, &b->modules_which_use_me, list) { | |
535 | if (use->module_which_uses == a) { | |
536 | DEBUGP("%s uses %s!\n", a->name, b->name); | |
537 | return 1; | |
538 | } | |
539 | } | |
540 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
541 | return 0; | |
542 | } | |
543 | ||
544 | /* Module a uses b */ | |
545 | static int use_module(struct module *a, struct module *b) | |
546 | { | |
547 | struct module_use *use; | |
c9a3ba55 | 548 | int no_warn, err; |
270a6c4c | 549 | |
1da177e4 LT |
550 | if (b == NULL || already_uses(a, b)) return 1; |
551 | ||
c9a3ba55 RR |
552 | /* If we're interrupted or time out, we fail. */ |
553 | if (wait_event_interruptible_timeout( | |
554 | module_wq, (err = strong_try_module_get(b)) != -EBUSY, | |
555 | 30 * HZ) <= 0) { | |
556 | printk("%s: gave up waiting for init of module %s.\n", | |
557 | a->name, b->name); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | /* If strong_try_module_get() returned a different error, we fail. */ | |
562 | if (err) | |
1da177e4 LT |
563 | return 0; |
564 | ||
565 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
566 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
567 | if (!use) { | |
568 | printk("%s: out of memory loading\n", a->name); | |
569 | module_put(b); | |
570 | return 0; | |
571 | } | |
572 | ||
573 | use->module_which_uses = a; | |
574 | list_add(&use->list, &b->modules_which_use_me); | |
270a6c4c | 575 | no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
1da177e4 LT |
576 | return 1; |
577 | } | |
578 | ||
579 | /* Clear the unload stuff of the module. */ | |
580 | static void module_unload_free(struct module *mod) | |
581 | { | |
582 | struct module *i; | |
583 | ||
584 | list_for_each_entry(i, &modules, list) { | |
585 | struct module_use *use; | |
586 | ||
587 | list_for_each_entry(use, &i->modules_which_use_me, list) { | |
588 | if (use->module_which_uses == mod) { | |
589 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
590 | module_put(i); | |
591 | list_del(&use->list); | |
592 | kfree(use); | |
270a6c4c | 593 | sysfs_remove_link(i->holders_dir, mod->name); |
1da177e4 LT |
594 | /* There can be at most one match. */ |
595 | break; | |
596 | } | |
597 | } | |
598 | } | |
599 | } | |
600 | ||
601 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 602 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
603 | { |
604 | int ret = (flags & O_TRUNC); | |
605 | if (ret) | |
fb169793 | 606 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
607 | return ret; |
608 | } | |
609 | #else | |
fb169793 | 610 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
611 | { |
612 | return 0; | |
613 | } | |
614 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
615 | ||
616 | struct stopref | |
617 | { | |
618 | struct module *mod; | |
619 | int flags; | |
620 | int *forced; | |
621 | }; | |
622 | ||
623 | /* Whole machine is stopped with interrupts off when this runs. */ | |
624 | static int __try_stop_module(void *_sref) | |
625 | { | |
626 | struct stopref *sref = _sref; | |
627 | ||
628 | /* If it's not unused, quit unless we are told to block. */ | |
629 | if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) { | |
fb169793 | 630 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
631 | return -EWOULDBLOCK; |
632 | } | |
633 | ||
634 | /* Mark it as dying. */ | |
635 | sref->mod->state = MODULE_STATE_GOING; | |
636 | return 0; | |
637 | } | |
638 | ||
639 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
640 | { | |
641 | struct stopref sref = { mod, flags, forced }; | |
642 | ||
643 | return stop_machine_run(__try_stop_module, &sref, NR_CPUS); | |
644 | } | |
645 | ||
646 | unsigned int module_refcount(struct module *mod) | |
647 | { | |
648 | unsigned int i, total = 0; | |
649 | ||
650 | for (i = 0; i < NR_CPUS; i++) | |
651 | total += local_read(&mod->ref[i].count); | |
652 | return total; | |
653 | } | |
654 | EXPORT_SYMBOL(module_refcount); | |
655 | ||
656 | /* This exists whether we can unload or not */ | |
657 | static void free_module(struct module *mod); | |
658 | ||
659 | static void wait_for_zero_refcount(struct module *mod) | |
660 | { | |
661 | /* Since we might sleep for some time, drop the semaphore first */ | |
6389a385 | 662 | mutex_unlock(&module_mutex); |
1da177e4 LT |
663 | for (;;) { |
664 | DEBUGP("Looking at refcount...\n"); | |
665 | set_current_state(TASK_UNINTERRUPTIBLE); | |
666 | if (module_refcount(mod) == 0) | |
667 | break; | |
668 | schedule(); | |
669 | } | |
670 | current->state = TASK_RUNNING; | |
6389a385 | 671 | mutex_lock(&module_mutex); |
1da177e4 LT |
672 | } |
673 | ||
dfff0a06 GKH |
674 | asmlinkage long |
675 | sys_delete_module(const char __user *name_user, unsigned int flags) | |
1da177e4 LT |
676 | { |
677 | struct module *mod; | |
dfff0a06 | 678 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
679 | int ret, forced = 0; |
680 | ||
dfff0a06 GKH |
681 | if (!capable(CAP_SYS_MODULE)) |
682 | return -EPERM; | |
683 | ||
684 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
685 | return -EFAULT; | |
686 | name[MODULE_NAME_LEN-1] = '\0'; | |
687 | ||
6389a385 | 688 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
689 | return -EINTR; |
690 | ||
691 | mod = find_module(name); | |
692 | if (!mod) { | |
693 | ret = -ENOENT; | |
694 | goto out; | |
695 | } | |
696 | ||
697 | if (!list_empty(&mod->modules_which_use_me)) { | |
698 | /* Other modules depend on us: get rid of them first. */ | |
699 | ret = -EWOULDBLOCK; | |
700 | goto out; | |
701 | } | |
702 | ||
703 | /* Doing init or already dying? */ | |
704 | if (mod->state != MODULE_STATE_LIVE) { | |
705 | /* FIXME: if (force), slam module count and wake up | |
706 | waiter --RR */ | |
707 | DEBUGP("%s already dying\n", mod->name); | |
708 | ret = -EBUSY; | |
709 | goto out; | |
710 | } | |
711 | ||
712 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 713 | if (mod->init && !mod->exit) { |
fb169793 | 714 | forced = try_force_unload(flags); |
1da177e4 LT |
715 | if (!forced) { |
716 | /* This module can't be removed */ | |
717 | ret = -EBUSY; | |
718 | goto out; | |
719 | } | |
720 | } | |
721 | ||
722 | /* Set this up before setting mod->state */ | |
723 | mod->waiter = current; | |
724 | ||
725 | /* Stop the machine so refcounts can't move and disable module. */ | |
726 | ret = try_stop_module(mod, flags, &forced); | |
727 | if (ret != 0) | |
728 | goto out; | |
729 | ||
730 | /* Never wait if forced. */ | |
731 | if (!forced && module_refcount(mod) != 0) | |
732 | wait_for_zero_refcount(mod); | |
733 | ||
734 | /* Final destruction now noone is using it. */ | |
735 | if (mod->exit != NULL) { | |
6389a385 | 736 | mutex_unlock(&module_mutex); |
1da177e4 | 737 | mod->exit(); |
6389a385 | 738 | mutex_lock(&module_mutex); |
1da177e4 | 739 | } |
e14af7ee | 740 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 741 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 LT |
742 | free_module(mod); |
743 | ||
744 | out: | |
6389a385 | 745 | mutex_unlock(&module_mutex); |
1da177e4 LT |
746 | return ret; |
747 | } | |
748 | ||
749 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
750 | { | |
751 | struct module_use *use; | |
752 | int printed_something = 0; | |
753 | ||
754 | seq_printf(m, " %u ", module_refcount(mod)); | |
755 | ||
756 | /* Always include a trailing , so userspace can differentiate | |
757 | between this and the old multi-field proc format. */ | |
758 | list_for_each_entry(use, &mod->modules_which_use_me, list) { | |
759 | printed_something = 1; | |
760 | seq_printf(m, "%s,", use->module_which_uses->name); | |
761 | } | |
762 | ||
1da177e4 LT |
763 | if (mod->init != NULL && mod->exit == NULL) { |
764 | printed_something = 1; | |
765 | seq_printf(m, "[permanent],"); | |
766 | } | |
767 | ||
768 | if (!printed_something) | |
769 | seq_printf(m, "-"); | |
770 | } | |
771 | ||
772 | void __symbol_put(const char *symbol) | |
773 | { | |
774 | struct module *owner; | |
1da177e4 LT |
775 | const unsigned long *crc; |
776 | ||
24da1cbf | 777 | preempt_disable(); |
1da177e4 LT |
778 | if (!__find_symbol(symbol, &owner, &crc, 1)) |
779 | BUG(); | |
780 | module_put(owner); | |
24da1cbf | 781 | preempt_enable(); |
1da177e4 LT |
782 | } |
783 | EXPORT_SYMBOL(__symbol_put); | |
784 | ||
785 | void symbol_put_addr(void *addr) | |
786 | { | |
5e376613 | 787 | struct module *modaddr; |
1da177e4 | 788 | |
5e376613 TP |
789 | if (core_kernel_text((unsigned long)addr)) |
790 | return; | |
1da177e4 | 791 | |
5e376613 TP |
792 | if (!(modaddr = module_text_address((unsigned long)addr))) |
793 | BUG(); | |
794 | module_put(modaddr); | |
1da177e4 LT |
795 | } |
796 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
797 | ||
798 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
799 | struct module *mod, char *buffer) | |
800 | { | |
256e2fdf | 801 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
802 | } |
803 | ||
804 | static struct module_attribute refcnt = { | |
7b595756 | 805 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
806 | .show = show_refcnt, |
807 | }; | |
808 | ||
f6a57033 AV |
809 | void module_put(struct module *module) |
810 | { | |
811 | if (module) { | |
812 | unsigned int cpu = get_cpu(); | |
813 | local_dec(&module->ref[cpu].count); | |
814 | /* Maybe they're waiting for us to drop reference? */ | |
815 | if (unlikely(!module_is_live(module))) | |
816 | wake_up_process(module->waiter); | |
817 | put_cpu(); | |
818 | } | |
819 | } | |
820 | EXPORT_SYMBOL(module_put); | |
821 | ||
1da177e4 LT |
822 | #else /* !CONFIG_MODULE_UNLOAD */ |
823 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
824 | { | |
825 | /* We don't know the usage count, or what modules are using. */ | |
826 | seq_printf(m, " - -"); | |
827 | } | |
828 | ||
829 | static inline void module_unload_free(struct module *mod) | |
830 | { | |
831 | } | |
832 | ||
833 | static inline int use_module(struct module *a, struct module *b) | |
834 | { | |
c9a3ba55 | 835 | return strong_try_module_get(b) == 0; |
1da177e4 LT |
836 | } |
837 | ||
838 | static inline void module_unload_init(struct module *mod) | |
839 | { | |
840 | } | |
841 | #endif /* CONFIG_MODULE_UNLOAD */ | |
842 | ||
1f71740a KS |
843 | static ssize_t show_initstate(struct module_attribute *mattr, |
844 | struct module *mod, char *buffer) | |
845 | { | |
846 | const char *state = "unknown"; | |
847 | ||
848 | switch (mod->state) { | |
849 | case MODULE_STATE_LIVE: | |
850 | state = "live"; | |
851 | break; | |
852 | case MODULE_STATE_COMING: | |
853 | state = "coming"; | |
854 | break; | |
855 | case MODULE_STATE_GOING: | |
856 | state = "going"; | |
857 | break; | |
858 | } | |
859 | return sprintf(buffer, "%s\n", state); | |
860 | } | |
861 | ||
862 | static struct module_attribute initstate = { | |
7b595756 | 863 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
864 | .show = show_initstate, |
865 | }; | |
866 | ||
03e88ae1 GKH |
867 | static struct module_attribute *modinfo_attrs[] = { |
868 | &modinfo_version, | |
869 | &modinfo_srcversion, | |
1f71740a | 870 | &initstate, |
03e88ae1 GKH |
871 | #ifdef CONFIG_MODULE_UNLOAD |
872 | &refcnt, | |
873 | #endif | |
874 | NULL, | |
875 | }; | |
876 | ||
1da177e4 LT |
877 | static const char vermagic[] = VERMAGIC_STRING; |
878 | ||
879 | #ifdef CONFIG_MODVERSIONS | |
880 | static int check_version(Elf_Shdr *sechdrs, | |
881 | unsigned int versindex, | |
882 | const char *symname, | |
883 | struct module *mod, | |
884 | const unsigned long *crc) | |
885 | { | |
886 | unsigned int i, num_versions; | |
887 | struct modversion_info *versions; | |
888 | ||
889 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
890 | if (!crc) | |
891 | return 1; | |
892 | ||
893 | versions = (void *) sechdrs[versindex].sh_addr; | |
894 | num_versions = sechdrs[versindex].sh_size | |
895 | / sizeof(struct modversion_info); | |
896 | ||
897 | for (i = 0; i < num_versions; i++) { | |
898 | if (strcmp(versions[i].name, symname) != 0) | |
899 | continue; | |
900 | ||
901 | if (versions[i].crc == *crc) | |
902 | return 1; | |
903 | printk("%s: disagrees about version of symbol %s\n", | |
904 | mod->name, symname); | |
905 | DEBUGP("Found checksum %lX vs module %lX\n", | |
906 | *crc, versions[i].crc); | |
907 | return 0; | |
908 | } | |
909 | /* Not in module's version table. OK, but that taints the kernel. */ | |
fa3ba2e8 | 910 | if (!(tainted & TAINT_FORCED_MODULE)) |
1da177e4 LT |
911 | printk("%s: no version for \"%s\" found: kernel tainted.\n", |
912 | mod->name, symname); | |
fa3ba2e8 | 913 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1da177e4 LT |
914 | return 1; |
915 | } | |
916 | ||
917 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
918 | unsigned int versindex, | |
919 | struct module *mod) | |
920 | { | |
921 | const unsigned long *crc; | |
922 | struct module *owner; | |
923 | ||
924 | if (!__find_symbol("struct_module", &owner, &crc, 1)) | |
925 | BUG(); | |
926 | return check_version(sechdrs, versindex, "struct_module", mod, | |
927 | crc); | |
928 | } | |
929 | ||
930 | /* First part is kernel version, which we ignore. */ | |
931 | static inline int same_magic(const char *amagic, const char *bmagic) | |
932 | { | |
933 | amagic += strcspn(amagic, " "); | |
934 | bmagic += strcspn(bmagic, " "); | |
935 | return strcmp(amagic, bmagic) == 0; | |
936 | } | |
937 | #else | |
938 | static inline int check_version(Elf_Shdr *sechdrs, | |
939 | unsigned int versindex, | |
940 | const char *symname, | |
941 | struct module *mod, | |
942 | const unsigned long *crc) | |
943 | { | |
944 | return 1; | |
945 | } | |
946 | ||
947 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
948 | unsigned int versindex, | |
949 | struct module *mod) | |
950 | { | |
951 | return 1; | |
952 | } | |
953 | ||
954 | static inline int same_magic(const char *amagic, const char *bmagic) | |
955 | { | |
956 | return strcmp(amagic, bmagic) == 0; | |
957 | } | |
958 | #endif /* CONFIG_MODVERSIONS */ | |
959 | ||
960 | /* Resolve a symbol for this module. I.e. if we find one, record usage. | |
961 | Must be holding module_mutex. */ | |
962 | static unsigned long resolve_symbol(Elf_Shdr *sechdrs, | |
963 | unsigned int versindex, | |
964 | const char *name, | |
965 | struct module *mod) | |
966 | { | |
967 | struct module *owner; | |
968 | unsigned long ret; | |
969 | const unsigned long *crc; | |
970 | ||
fa3ba2e8 FM |
971 | ret = __find_symbol(name, &owner, &crc, |
972 | !(mod->taints & TAINT_PROPRIETARY_MODULE)); | |
1da177e4 | 973 | if (ret) { |
9a4b9708 ML |
974 | /* use_module can fail due to OOM, |
975 | or module initialization or unloading */ | |
1da177e4 LT |
976 | if (!check_version(sechdrs, versindex, name, mod, crc) || |
977 | !use_module(mod, owner)) | |
978 | ret = 0; | |
979 | } | |
1da177e4 LT |
980 | return ret; |
981 | } | |
982 | ||
983 | ||
984 | /* | |
985 | * /sys/module/foo/sections stuff | |
986 | * J. Corbet <corbet@lwn.net> | |
987 | */ | |
988 | #ifdef CONFIG_KALLSYMS | |
989 | static ssize_t module_sect_show(struct module_attribute *mattr, | |
990 | struct module *mod, char *buf) | |
991 | { | |
992 | struct module_sect_attr *sattr = | |
993 | container_of(mattr, struct module_sect_attr, mattr); | |
994 | return sprintf(buf, "0x%lx\n", sattr->address); | |
995 | } | |
996 | ||
04b1db9f IN |
997 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
998 | { | |
999 | int section; | |
1000 | ||
1001 | for (section = 0; section < sect_attrs->nsections; section++) | |
1002 | kfree(sect_attrs->attrs[section].name); | |
1003 | kfree(sect_attrs); | |
1004 | } | |
1005 | ||
1da177e4 LT |
1006 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1007 | char *secstrings, Elf_Shdr *sechdrs) | |
1008 | { | |
1009 | unsigned int nloaded = 0, i, size[2]; | |
1010 | struct module_sect_attrs *sect_attrs; | |
1011 | struct module_sect_attr *sattr; | |
1012 | struct attribute **gattr; | |
22a8bdeb | 1013 | |
1da177e4 LT |
1014 | /* Count loaded sections and allocate structures */ |
1015 | for (i = 0; i < nsect; i++) | |
1016 | if (sechdrs[i].sh_flags & SHF_ALLOC) | |
1017 | nloaded++; | |
1018 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1019 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1020 | sizeof(sect_attrs->grp.attrs[0])); | |
1021 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1022 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1023 | if (sect_attrs == NULL) | |
1da177e4 LT |
1024 | return; |
1025 | ||
1026 | /* Setup section attributes. */ | |
1027 | sect_attrs->grp.name = "sections"; | |
1028 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1029 | ||
04b1db9f | 1030 | sect_attrs->nsections = 0; |
1da177e4 LT |
1031 | sattr = §_attrs->attrs[0]; |
1032 | gattr = §_attrs->grp.attrs[0]; | |
1033 | for (i = 0; i < nsect; i++) { | |
1034 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) | |
1035 | continue; | |
1036 | sattr->address = sechdrs[i].sh_addr; | |
04b1db9f IN |
1037 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1038 | GFP_KERNEL); | |
1039 | if (sattr->name == NULL) | |
1040 | goto out; | |
1041 | sect_attrs->nsections++; | |
1da177e4 LT |
1042 | sattr->mattr.show = module_sect_show; |
1043 | sattr->mattr.store = NULL; | |
1044 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1045 | sattr->mattr.attr.mode = S_IRUGO; |
1046 | *(gattr++) = &(sattr++)->mattr.attr; | |
1047 | } | |
1048 | *gattr = NULL; | |
1049 | ||
1050 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1051 | goto out; | |
1052 | ||
1053 | mod->sect_attrs = sect_attrs; | |
1054 | return; | |
1055 | out: | |
04b1db9f | 1056 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1057 | } |
1058 | ||
1059 | static void remove_sect_attrs(struct module *mod) | |
1060 | { | |
1061 | if (mod->sect_attrs) { | |
1062 | sysfs_remove_group(&mod->mkobj.kobj, | |
1063 | &mod->sect_attrs->grp); | |
1064 | /* We are positive that no one is using any sect attrs | |
1065 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1066 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1067 | mod->sect_attrs = NULL; |
1068 | } | |
1069 | } | |
1070 | ||
6d760133 RM |
1071 | /* |
1072 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1073 | */ | |
1074 | ||
1075 | struct module_notes_attrs { | |
1076 | struct kobject *dir; | |
1077 | unsigned int notes; | |
1078 | struct bin_attribute attrs[0]; | |
1079 | }; | |
1080 | ||
1081 | static ssize_t module_notes_read(struct kobject *kobj, | |
1082 | struct bin_attribute *bin_attr, | |
1083 | char *buf, loff_t pos, size_t count) | |
1084 | { | |
1085 | /* | |
1086 | * The caller checked the pos and count against our size. | |
1087 | */ | |
1088 | memcpy(buf, bin_attr->private + pos, count); | |
1089 | return count; | |
1090 | } | |
1091 | ||
1092 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1093 | unsigned int i) | |
1094 | { | |
1095 | if (notes_attrs->dir) { | |
1096 | while (i-- > 0) | |
1097 | sysfs_remove_bin_file(notes_attrs->dir, | |
1098 | ¬es_attrs->attrs[i]); | |
1099 | kobject_del(notes_attrs->dir); | |
1100 | } | |
1101 | kfree(notes_attrs); | |
1102 | } | |
1103 | ||
1104 | static void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1105 | char *secstrings, Elf_Shdr *sechdrs) | |
1106 | { | |
1107 | unsigned int notes, loaded, i; | |
1108 | struct module_notes_attrs *notes_attrs; | |
1109 | struct bin_attribute *nattr; | |
1110 | ||
1111 | /* Count notes sections and allocate structures. */ | |
1112 | notes = 0; | |
1113 | for (i = 0; i < nsect; i++) | |
1114 | if ((sechdrs[i].sh_flags & SHF_ALLOC) && | |
1115 | (sechdrs[i].sh_type == SHT_NOTE)) | |
1116 | ++notes; | |
1117 | ||
1118 | if (notes == 0) | |
1119 | return; | |
1120 | ||
1121 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1122 | + notes * sizeof(notes_attrs->attrs[0]), | |
1123 | GFP_KERNEL); | |
1124 | if (notes_attrs == NULL) | |
1125 | return; | |
1126 | ||
1127 | notes_attrs->notes = notes; | |
1128 | nattr = ¬es_attrs->attrs[0]; | |
1129 | for (loaded = i = 0; i < nsect; ++i) { | |
1130 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1131 | continue; | |
1132 | if (sechdrs[i].sh_type == SHT_NOTE) { | |
1133 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; | |
1134 | nattr->attr.mode = S_IRUGO; | |
1135 | nattr->size = sechdrs[i].sh_size; | |
1136 | nattr->private = (void *) sechdrs[i].sh_addr; | |
1137 | nattr->read = module_notes_read; | |
1138 | ++nattr; | |
1139 | } | |
1140 | ++loaded; | |
1141 | } | |
1142 | ||
4ff6abff | 1143 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1144 | if (!notes_attrs->dir) |
1145 | goto out; | |
1146 | ||
1147 | for (i = 0; i < notes; ++i) | |
1148 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1149 | ¬es_attrs->attrs[i])) | |
1150 | goto out; | |
1151 | ||
1152 | mod->notes_attrs = notes_attrs; | |
1153 | return; | |
1154 | ||
1155 | out: | |
1156 | free_notes_attrs(notes_attrs, i); | |
1157 | } | |
1158 | ||
1159 | static void remove_notes_attrs(struct module *mod) | |
1160 | { | |
1161 | if (mod->notes_attrs) | |
1162 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1163 | } | |
1164 | ||
1da177e4 | 1165 | #else |
04b1db9f | 1166 | |
1da177e4 LT |
1167 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1168 | char *sectstrings, Elf_Shdr *sechdrs) | |
1169 | { | |
1170 | } | |
1171 | ||
1172 | static inline void remove_sect_attrs(struct module *mod) | |
1173 | { | |
1174 | } | |
6d760133 RM |
1175 | |
1176 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1177 | char *sectstrings, Elf_Shdr *sechdrs) | |
1178 | { | |
1179 | } | |
1180 | ||
1181 | static inline void remove_notes_attrs(struct module *mod) | |
1182 | { | |
1183 | } | |
1da177e4 LT |
1184 | #endif /* CONFIG_KALLSYMS */ |
1185 | ||
ef665c1a RD |
1186 | #ifdef CONFIG_SYSFS |
1187 | int module_add_modinfo_attrs(struct module *mod) | |
c988d2b2 MD |
1188 | { |
1189 | struct module_attribute *attr; | |
03e88ae1 | 1190 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1191 | int error = 0; |
1192 | int i; | |
1193 | ||
03e88ae1 GKH |
1194 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1195 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1196 | GFP_KERNEL); | |
1197 | if (!mod->modinfo_attrs) | |
1198 | return -ENOMEM; | |
1199 | ||
1200 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1201 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1202 | if (!attr->test || | |
03e88ae1 GKH |
1203 | (attr->test && attr->test(mod))) { |
1204 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
03e88ae1 GKH |
1205 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1206 | ++temp_attr; | |
1207 | } | |
c988d2b2 MD |
1208 | } |
1209 | return error; | |
1210 | } | |
1211 | ||
ef665c1a | 1212 | void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1213 | { |
1214 | struct module_attribute *attr; | |
1215 | int i; | |
1216 | ||
03e88ae1 GKH |
1217 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1218 | /* pick a field to test for end of list */ | |
1219 | if (!attr->attr.name) | |
1220 | break; | |
c988d2b2 | 1221 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1222 | if (attr->free) |
1223 | attr->free(mod); | |
c988d2b2 | 1224 | } |
03e88ae1 | 1225 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1226 | } |
ef665c1a | 1227 | #endif |
1da177e4 | 1228 | |
ef665c1a RD |
1229 | #ifdef CONFIG_SYSFS |
1230 | int mod_sysfs_init(struct module *mod) | |
1da177e4 LT |
1231 | { |
1232 | int err; | |
1233 | ||
823bccfc GKH |
1234 | if (!module_sysfs_initialized) { |
1235 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1236 | mod->name); |
1237 | err = -EINVAL; | |
1238 | goto out; | |
1239 | } | |
1da177e4 | 1240 | mod->mkobj.mod = mod; |
e17e0f51 | 1241 | |
ac3c8141 GKH |
1242 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1243 | mod->mkobj.kobj.kset = module_kset; | |
1244 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1245 | "%s", mod->name); | |
1246 | if (err) | |
1247 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1248 | |
97c146ef | 1249 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1250 | out: |
1251 | return err; | |
1252 | } | |
1253 | ||
ef665c1a | 1254 | int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1255 | struct kernel_param *kparam, |
1256 | unsigned int num_params) | |
1257 | { | |
1258 | int err; | |
1259 | ||
4ff6abff | 1260 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1261 | if (!mod->holders_dir) { |
1262 | err = -ENOMEM; | |
270a6c4c | 1263 | goto out_unreg; |
240936e1 | 1264 | } |
270a6c4c | 1265 | |
1da177e4 LT |
1266 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1267 | if (err) | |
270a6c4c | 1268 | goto out_unreg_holders; |
1da177e4 | 1269 | |
c988d2b2 MD |
1270 | err = module_add_modinfo_attrs(mod); |
1271 | if (err) | |
e17e0f51 | 1272 | goto out_unreg_param; |
c988d2b2 | 1273 | |
e17e0f51 | 1274 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1275 | return 0; |
1276 | ||
e17e0f51 KS |
1277 | out_unreg_param: |
1278 | module_param_sysfs_remove(mod); | |
270a6c4c | 1279 | out_unreg_holders: |
78a2d906 | 1280 | kobject_put(mod->holders_dir); |
270a6c4c | 1281 | out_unreg: |
e17e0f51 | 1282 | kobject_put(&mod->mkobj.kobj); |
1da177e4 LT |
1283 | return err; |
1284 | } | |
ef665c1a | 1285 | #endif |
1da177e4 LT |
1286 | |
1287 | static void mod_kobject_remove(struct module *mod) | |
1288 | { | |
c988d2b2 | 1289 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1290 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1291 | kobject_put(mod->mkobj.drivers_dir); |
1292 | kobject_put(mod->holders_dir); | |
1293 | kobject_put(&mod->mkobj.kobj); | |
1da177e4 LT |
1294 | } |
1295 | ||
bb9d3d56 RR |
1296 | /* |
1297 | * link the module with the whole machine is stopped with interrupts off | |
1298 | * - this defends against kallsyms not taking locks | |
1299 | */ | |
1300 | static int __link_module(void *_mod) | |
1301 | { | |
1302 | struct module *mod = _mod; | |
1303 | list_add(&mod->list, &modules); | |
1304 | return 0; | |
1305 | } | |
1306 | ||
1da177e4 LT |
1307 | /* |
1308 | * unlink the module with the whole machine is stopped with interrupts off | |
1309 | * - this defends against kallsyms not taking locks | |
1310 | */ | |
1311 | static int __unlink_module(void *_mod) | |
1312 | { | |
1313 | struct module *mod = _mod; | |
1314 | list_del(&mod->list); | |
1315 | return 0; | |
1316 | } | |
1317 | ||
02a3e59a | 1318 | /* Free a module, remove from lists, etc (must hold module_mutex). */ |
1da177e4 LT |
1319 | static void free_module(struct module *mod) |
1320 | { | |
1321 | /* Delete from various lists */ | |
1322 | stop_machine_run(__unlink_module, mod, NR_CPUS); | |
6d760133 | 1323 | remove_notes_attrs(mod); |
1da177e4 LT |
1324 | remove_sect_attrs(mod); |
1325 | mod_kobject_remove(mod); | |
1326 | ||
4552d5dc JB |
1327 | unwind_remove_table(mod->unwind_info, 0); |
1328 | ||
1da177e4 LT |
1329 | /* Arch-specific cleanup. */ |
1330 | module_arch_cleanup(mod); | |
1331 | ||
1332 | /* Module unload stuff */ | |
1333 | module_unload_free(mod); | |
1334 | ||
1335 | /* This may be NULL, but that's OK */ | |
1336 | module_free(mod, mod->module_init); | |
1337 | kfree(mod->args); | |
1338 | if (mod->percpu) | |
1339 | percpu_modfree(mod->percpu); | |
1340 | ||
fbb9ce95 IM |
1341 | /* Free lock-classes: */ |
1342 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1343 | ||
1da177e4 LT |
1344 | /* Finally, free the core (containing the module structure) */ |
1345 | module_free(mod, mod->module_core); | |
1346 | } | |
1347 | ||
1348 | void *__symbol_get(const char *symbol) | |
1349 | { | |
1350 | struct module *owner; | |
24da1cbf | 1351 | unsigned long value; |
1da177e4 LT |
1352 | const unsigned long *crc; |
1353 | ||
24da1cbf | 1354 | preempt_disable(); |
1da177e4 | 1355 | value = __find_symbol(symbol, &owner, &crc, 1); |
c9a3ba55 | 1356 | if (value && strong_try_module_get(owner) != 0) |
1da177e4 | 1357 | value = 0; |
24da1cbf | 1358 | preempt_enable(); |
1da177e4 LT |
1359 | |
1360 | return (void *)value; | |
1361 | } | |
1362 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1363 | ||
eea8b54d AN |
1364 | /* |
1365 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1366 | * in the kernel or in some other module's exported symbol table. |
eea8b54d AN |
1367 | */ |
1368 | static int verify_export_symbols(struct module *mod) | |
1369 | { | |
1370 | const char *name = NULL; | |
1371 | unsigned long i, ret = 0; | |
1372 | struct module *owner; | |
1373 | const unsigned long *crc; | |
1374 | ||
1375 | for (i = 0; i < mod->num_syms; i++) | |
22a8bdeb | 1376 | if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) { |
eea8b54d AN |
1377 | name = mod->syms[i].name; |
1378 | ret = -ENOEXEC; | |
1379 | goto dup; | |
1380 | } | |
1381 | ||
1382 | for (i = 0; i < mod->num_gpl_syms; i++) | |
22a8bdeb | 1383 | if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) { |
eea8b54d AN |
1384 | name = mod->gpl_syms[i].name; |
1385 | ret = -ENOEXEC; | |
1386 | goto dup; | |
1387 | } | |
1388 | ||
1389 | dup: | |
1390 | if (ret) | |
1391 | printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n", | |
1392 | mod->name, name, module_name(owner)); | |
1393 | ||
1394 | return ret; | |
1395 | } | |
1396 | ||
9a4b9708 | 1397 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4 LT |
1398 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1399 | unsigned int symindex, | |
1400 | const char *strtab, | |
1401 | unsigned int versindex, | |
1402 | unsigned int pcpuindex, | |
1403 | struct module *mod) | |
1404 | { | |
1405 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1406 | unsigned long secbase; | |
1407 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1408 | int ret = 0; | |
1409 | ||
1410 | for (i = 1; i < n; i++) { | |
1411 | switch (sym[i].st_shndx) { | |
1412 | case SHN_COMMON: | |
1413 | /* We compiled with -fno-common. These are not | |
1414 | supposed to happen. */ | |
1415 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1416 | printk("%s: please compile with -fno-common\n", | |
1417 | mod->name); | |
1418 | ret = -ENOEXEC; | |
1419 | break; | |
1420 | ||
1421 | case SHN_ABS: | |
1422 | /* Don't need to do anything */ | |
1423 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1424 | (long)sym[i].st_value); | |
1425 | break; | |
1426 | ||
1427 | case SHN_UNDEF: | |
1428 | sym[i].st_value | |
1429 | = resolve_symbol(sechdrs, versindex, | |
1430 | strtab + sym[i].st_name, mod); | |
1431 | ||
1432 | /* Ok if resolved. */ | |
1433 | if (sym[i].st_value != 0) | |
1434 | break; | |
1435 | /* Ok if weak. */ | |
1436 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) | |
1437 | break; | |
1438 | ||
1439 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
1440 | mod->name, strtab + sym[i].st_name); | |
1441 | ret = -ENOENT; | |
1442 | break; | |
1443 | ||
1444 | default: | |
1445 | /* Divert to percpu allocation if a percpu var. */ | |
1446 | if (sym[i].st_shndx == pcpuindex) | |
1447 | secbase = (unsigned long)mod->percpu; | |
1448 | else | |
1449 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1450 | sym[i].st_value += secbase; | |
1451 | break; | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | return ret; | |
1456 | } | |
1457 | ||
1458 | /* Update size with this section: return offset. */ | |
1459 | static long get_offset(unsigned long *size, Elf_Shdr *sechdr) | |
1460 | { | |
1461 | long ret; | |
1462 | ||
1463 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); | |
1464 | *size = ret + sechdr->sh_size; | |
1465 | return ret; | |
1466 | } | |
1467 | ||
1468 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1469 | might -- code, read-only data, read-write data, small data. Tally | |
1470 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1471 | belongs in init. */ | |
1472 | static void layout_sections(struct module *mod, | |
1473 | const Elf_Ehdr *hdr, | |
1474 | Elf_Shdr *sechdrs, | |
1475 | const char *secstrings) | |
1476 | { | |
1477 | static unsigned long const masks[][2] = { | |
1478 | /* NOTE: all executable code must be the first section | |
1479 | * in this array; otherwise modify the text_size | |
1480 | * finder in the two loops below */ | |
1481 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1482 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1483 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1484 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1485 | }; | |
1486 | unsigned int m, i; | |
1487 | ||
1488 | for (i = 0; i < hdr->e_shnum; i++) | |
1489 | sechdrs[i].sh_entsize = ~0UL; | |
1490 | ||
1491 | DEBUGP("Core section allocation order:\n"); | |
1492 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1493 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1494 | Elf_Shdr *s = &sechdrs[i]; | |
1495 | ||
1496 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1497 | || (s->sh_flags & masks[m][1]) | |
1498 | || s->sh_entsize != ~0UL | |
1499 | || strncmp(secstrings + s->sh_name, | |
1500 | ".init", 5) == 0) | |
1501 | continue; | |
1502 | s->sh_entsize = get_offset(&mod->core_size, s); | |
1503 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1504 | } | |
1505 | if (m == 0) | |
1506 | mod->core_text_size = mod->core_size; | |
1507 | } | |
1508 | ||
1509 | DEBUGP("Init section allocation order:\n"); | |
1510 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1511 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1512 | Elf_Shdr *s = &sechdrs[i]; | |
1513 | ||
1514 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1515 | || (s->sh_flags & masks[m][1]) | |
1516 | || s->sh_entsize != ~0UL | |
1517 | || strncmp(secstrings + s->sh_name, | |
1518 | ".init", 5) != 0) | |
1519 | continue; | |
1520 | s->sh_entsize = (get_offset(&mod->init_size, s) | |
1521 | | INIT_OFFSET_MASK); | |
1522 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1523 | } | |
1524 | if (m == 0) | |
1525 | mod->init_text_size = mod->init_size; | |
1526 | } | |
1527 | } | |
1528 | ||
1da177e4 LT |
1529 | static void set_license(struct module *mod, const char *license) |
1530 | { | |
1531 | if (!license) | |
1532 | license = "unspecified"; | |
1533 | ||
fa3ba2e8 FM |
1534 | if (!license_is_gpl_compatible(license)) { |
1535 | if (!(tainted & TAINT_PROPRIETARY_MODULE)) | |
1d4d2627 | 1536 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1537 | "kernel.\n", mod->name, license); |
1538 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1539 | } |
1540 | } | |
1541 | ||
1542 | /* Parse tag=value strings from .modinfo section */ | |
1543 | static char *next_string(char *string, unsigned long *secsize) | |
1544 | { | |
1545 | /* Skip non-zero chars */ | |
1546 | while (string[0]) { | |
1547 | string++; | |
1548 | if ((*secsize)-- <= 1) | |
1549 | return NULL; | |
1550 | } | |
1551 | ||
1552 | /* Skip any zero padding. */ | |
1553 | while (!string[0]) { | |
1554 | string++; | |
1555 | if ((*secsize)-- <= 1) | |
1556 | return NULL; | |
1557 | } | |
1558 | return string; | |
1559 | } | |
1560 | ||
1561 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1562 | unsigned int info, | |
1563 | const char *tag) | |
1564 | { | |
1565 | char *p; | |
1566 | unsigned int taglen = strlen(tag); | |
1567 | unsigned long size = sechdrs[info].sh_size; | |
1568 | ||
1569 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1570 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1571 | return p + taglen + 1; | |
1572 | } | |
1573 | return NULL; | |
1574 | } | |
1575 | ||
c988d2b2 MD |
1576 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1577 | unsigned int infoindex) | |
1578 | { | |
1579 | struct module_attribute *attr; | |
1580 | int i; | |
1581 | ||
1582 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1583 | if (attr->setup) | |
1584 | attr->setup(mod, | |
1585 | get_modinfo(sechdrs, | |
1586 | infoindex, | |
1587 | attr->attr.name)); | |
1588 | } | |
1589 | } | |
c988d2b2 | 1590 | |
1da177e4 | 1591 | #ifdef CONFIG_KALLSYMS |
ea07890a | 1592 | static int is_exported(const char *name, const struct module *mod) |
1da177e4 | 1593 | { |
3fd6805f SR |
1594 | if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) |
1595 | return 1; | |
1596 | else | |
f867d2a2 | 1597 | if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) |
1da177e4 | 1598 | return 1; |
3fd6805f SR |
1599 | else |
1600 | return 0; | |
1da177e4 LT |
1601 | } |
1602 | ||
1603 | /* As per nm */ | |
1604 | static char elf_type(const Elf_Sym *sym, | |
1605 | Elf_Shdr *sechdrs, | |
1606 | const char *secstrings, | |
1607 | struct module *mod) | |
1608 | { | |
1609 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1610 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1611 | return 'v'; | |
1612 | else | |
1613 | return 'w'; | |
1614 | } | |
1615 | if (sym->st_shndx == SHN_UNDEF) | |
1616 | return 'U'; | |
1617 | if (sym->st_shndx == SHN_ABS) | |
1618 | return 'a'; | |
1619 | if (sym->st_shndx >= SHN_LORESERVE) | |
1620 | return '?'; | |
1621 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1622 | return 't'; | |
1623 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1624 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1625 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1626 | return 'r'; | |
1627 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1628 | return 'g'; | |
1629 | else | |
1630 | return 'd'; | |
1631 | } | |
1632 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1633 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1634 | return 's'; | |
1635 | else | |
1636 | return 'b'; | |
1637 | } | |
1638 | if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, | |
1639 | ".debug", strlen(".debug")) == 0) | |
1640 | return 'n'; | |
1641 | return '?'; | |
1642 | } | |
1643 | ||
1644 | static void add_kallsyms(struct module *mod, | |
1645 | Elf_Shdr *sechdrs, | |
1646 | unsigned int symindex, | |
1647 | unsigned int strindex, | |
1648 | const char *secstrings) | |
1649 | { | |
1650 | unsigned int i; | |
1651 | ||
1652 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
1653 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1654 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
1655 | ||
1656 | /* Set types up while we still have access to sections. */ | |
1657 | for (i = 0; i < mod->num_symtab; i++) | |
1658 | mod->symtab[i].st_info | |
1659 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
1660 | } | |
1661 | #else | |
1662 | static inline void add_kallsyms(struct module *mod, | |
1663 | Elf_Shdr *sechdrs, | |
1664 | unsigned int symindex, | |
1665 | unsigned int strindex, | |
1666 | const char *secstrings) | |
1667 | { | |
1668 | } | |
1669 | #endif /* CONFIG_KALLSYMS */ | |
1670 | ||
1671 | /* Allocate and load the module: note that size of section 0 is always | |
1672 | zero, and we rely on this for optional sections. */ | |
1673 | static struct module *load_module(void __user *umod, | |
1674 | unsigned long len, | |
1675 | const char __user *uargs) | |
1676 | { | |
1677 | Elf_Ehdr *hdr; | |
1678 | Elf_Shdr *sechdrs; | |
1679 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
84860f99 AM |
1680 | unsigned int i; |
1681 | unsigned int symindex = 0; | |
1682 | unsigned int strindex = 0; | |
1683 | unsigned int setupindex; | |
1684 | unsigned int exindex; | |
1685 | unsigned int exportindex; | |
1686 | unsigned int modindex; | |
1687 | unsigned int obsparmindex; | |
1688 | unsigned int infoindex; | |
1689 | unsigned int gplindex; | |
1690 | unsigned int crcindex; | |
1691 | unsigned int gplcrcindex; | |
1692 | unsigned int versindex; | |
1693 | unsigned int pcpuindex; | |
1694 | unsigned int gplfutureindex; | |
1695 | unsigned int gplfuturecrcindex; | |
1696 | unsigned int unwindex = 0; | |
1697 | unsigned int unusedindex; | |
1698 | unsigned int unusedcrcindex; | |
1699 | unsigned int unusedgplindex; | |
1700 | unsigned int unusedgplcrcindex; | |
8256e47c MD |
1701 | unsigned int markersindex; |
1702 | unsigned int markersstringsindex; | |
1da177e4 LT |
1703 | struct module *mod; |
1704 | long err = 0; | |
1705 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ | |
1706 | struct exception_table_entry *extable; | |
378bac82 | 1707 | mm_segment_t old_fs; |
1da177e4 LT |
1708 | |
1709 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
1710 | umod, len, uargs); | |
1711 | if (len < sizeof(*hdr)) | |
1712 | return ERR_PTR(-ENOEXEC); | |
1713 | ||
1714 | /* Suck in entire file: we'll want most of it. */ | |
1715 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
1716 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
1717 | return ERR_PTR(-ENOMEM); | |
1718 | if (copy_from_user(hdr, umod, len) != 0) { | |
1719 | err = -EFAULT; | |
1720 | goto free_hdr; | |
1721 | } | |
1722 | ||
1723 | /* Sanity checks against insmoding binaries or wrong arch, | |
1724 | weird elf version */ | |
1725 | if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 | |
1726 | || hdr->e_type != ET_REL | |
1727 | || !elf_check_arch(hdr) | |
1728 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
1729 | err = -ENOEXEC; | |
1730 | goto free_hdr; | |
1731 | } | |
1732 | ||
1733 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
1734 | goto truncated; | |
1735 | ||
1736 | /* Convenience variables */ | |
1737 | sechdrs = (void *)hdr + hdr->e_shoff; | |
1738 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
1739 | sechdrs[0].sh_addr = 0; | |
1740 | ||
1741 | for (i = 1; i < hdr->e_shnum; i++) { | |
1742 | if (sechdrs[i].sh_type != SHT_NOBITS | |
1743 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
1744 | goto truncated; | |
1745 | ||
1746 | /* Mark all sections sh_addr with their address in the | |
1747 | temporary image. */ | |
1748 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
1749 | ||
1750 | /* Internal symbols and strings. */ | |
1751 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
1752 | symindex = i; | |
1753 | strindex = sechdrs[i].sh_link; | |
1754 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
1755 | } | |
1756 | #ifndef CONFIG_MODULE_UNLOAD | |
1757 | /* Don't load .exit sections */ | |
1758 | if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) | |
1759 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1760 | #endif | |
1761 | } | |
1762 | ||
1763 | modindex = find_sec(hdr, sechdrs, secstrings, | |
1764 | ".gnu.linkonce.this_module"); | |
1765 | if (!modindex) { | |
1766 | printk(KERN_WARNING "No module found in object\n"); | |
1767 | err = -ENOEXEC; | |
1768 | goto free_hdr; | |
1769 | } | |
1770 | mod = (void *)sechdrs[modindex].sh_addr; | |
1771 | ||
1772 | if (symindex == 0) { | |
1773 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
1774 | mod->name); | |
1775 | err = -ENOEXEC; | |
1776 | goto free_hdr; | |
1777 | } | |
1778 | ||
1779 | /* Optional sections */ | |
1780 | exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); | |
1781 | gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); | |
9f28bb7e | 1782 | gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future"); |
f71d20e9 AV |
1783 | unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused"); |
1784 | unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl"); | |
1da177e4 LT |
1785 | crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); |
1786 | gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
9f28bb7e | 1787 | gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future"); |
f71d20e9 AV |
1788 | unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused"); |
1789 | unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl"); | |
1da177e4 LT |
1790 | setupindex = find_sec(hdr, sechdrs, secstrings, "__param"); |
1791 | exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table"); | |
1792 | obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm"); | |
1793 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); | |
1794 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
1795 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
4552d5dc JB |
1796 | #ifdef ARCH_UNWIND_SECTION_NAME |
1797 | unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME); | |
1798 | #endif | |
1da177e4 LT |
1799 | |
1800 | /* Don't keep modinfo section */ | |
1801 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1802 | #ifdef CONFIG_KALLSYMS | |
1803 | /* Keep symbol and string tables for decoding later. */ | |
1804 | sechdrs[symindex].sh_flags |= SHF_ALLOC; | |
1805 | sechdrs[strindex].sh_flags |= SHF_ALLOC; | |
1806 | #endif | |
4552d5dc JB |
1807 | if (unwindex) |
1808 | sechdrs[unwindex].sh_flags |= SHF_ALLOC; | |
1da177e4 LT |
1809 | |
1810 | /* Check module struct version now, before we try to use module. */ | |
1811 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
1812 | err = -ENOEXEC; | |
1813 | goto free_hdr; | |
1814 | } | |
1815 | ||
1816 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
1817 | /* This is allowed: modprobe --force will invalidate it. */ | |
1818 | if (!modmagic) { | |
fa3ba2e8 | 1819 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1da177e4 LT |
1820 | printk(KERN_WARNING "%s: no version magic, tainting kernel.\n", |
1821 | mod->name); | |
1822 | } else if (!same_magic(modmagic, vermagic)) { | |
1823 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", | |
1824 | mod->name, modmagic, vermagic); | |
1825 | err = -ENOEXEC; | |
1826 | goto free_hdr; | |
1827 | } | |
1828 | ||
1829 | /* Now copy in args */ | |
24277dda DA |
1830 | args = strndup_user(uargs, ~0UL >> 1); |
1831 | if (IS_ERR(args)) { | |
1832 | err = PTR_ERR(args); | |
1da177e4 LT |
1833 | goto free_hdr; |
1834 | } | |
8e08b756 | 1835 | |
1da177e4 LT |
1836 | if (find_module(mod->name)) { |
1837 | err = -EEXIST; | |
1838 | goto free_mod; | |
1839 | } | |
1840 | ||
1841 | mod->state = MODULE_STATE_COMING; | |
1842 | ||
1843 | /* Allow arches to frob section contents and sizes. */ | |
1844 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
1845 | if (err < 0) | |
1846 | goto free_mod; | |
1847 | ||
1848 | if (pcpuindex) { | |
1849 | /* We have a special allocation for this section. */ | |
1850 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, | |
842bbaaa RR |
1851 | sechdrs[pcpuindex].sh_addralign, |
1852 | mod->name); | |
1da177e4 LT |
1853 | if (!percpu) { |
1854 | err = -ENOMEM; | |
1855 | goto free_mod; | |
1856 | } | |
1857 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1858 | mod->percpu = percpu; | |
1859 | } | |
1860 | ||
1861 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
1862 | this is done generically; there doesn't appear to be any | |
1863 | special cases for the architectures. */ | |
1864 | layout_sections(mod, hdr, sechdrs, secstrings); | |
1865 | ||
1866 | /* Do the allocs. */ | |
1867 | ptr = module_alloc(mod->core_size); | |
1868 | if (!ptr) { | |
1869 | err = -ENOMEM; | |
1870 | goto free_percpu; | |
1871 | } | |
1872 | memset(ptr, 0, mod->core_size); | |
1873 | mod->module_core = ptr; | |
1874 | ||
1875 | ptr = module_alloc(mod->init_size); | |
1876 | if (!ptr && mod->init_size) { | |
1877 | err = -ENOMEM; | |
1878 | goto free_core; | |
1879 | } | |
1880 | memset(ptr, 0, mod->init_size); | |
1881 | mod->module_init = ptr; | |
1882 | ||
1883 | /* Transfer each section which specifies SHF_ALLOC */ | |
1884 | DEBUGP("final section addresses:\n"); | |
1885 | for (i = 0; i < hdr->e_shnum; i++) { | |
1886 | void *dest; | |
1887 | ||
1888 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1889 | continue; | |
1890 | ||
1891 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
1892 | dest = mod->module_init | |
1893 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
1894 | else | |
1895 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
1896 | ||
1897 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
1898 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
1899 | sechdrs[i].sh_size); | |
1900 | /* Update sh_addr to point to copy in image. */ | |
1901 | sechdrs[i].sh_addr = (unsigned long)dest; | |
1902 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
1903 | } | |
1904 | /* Module has been moved. */ | |
1905 | mod = (void *)sechdrs[modindex].sh_addr; | |
1906 | ||
1907 | /* Now we've moved module, initialize linked lists, etc. */ | |
1908 | module_unload_init(mod); | |
1909 | ||
97c146ef | 1910 | /* add kobject, so we can reference it. */ |
d58ae678 AM |
1911 | err = mod_sysfs_init(mod); |
1912 | if (err) | |
97c146ef | 1913 | goto free_unload; |
270a6c4c | 1914 | |
1da177e4 LT |
1915 | /* Set up license info based on the info section */ |
1916 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
1917 | ||
fa3ba2e8 | 1918 | if (strcmp(mod->name, "ndiswrapper") == 0) |
0e2d57fc | 1919 | add_taint(TAINT_PROPRIETARY_MODULE); |
fa3ba2e8 FM |
1920 | if (strcmp(mod->name, "driverloader") == 0) |
1921 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
9841d61d | 1922 | |
c988d2b2 MD |
1923 | /* Set up MODINFO_ATTR fields */ |
1924 | setup_modinfo(mod, sechdrs, infoindex); | |
c988d2b2 | 1925 | |
1da177e4 LT |
1926 | /* Fix up syms, so that st_value is a pointer to location. */ |
1927 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
1928 | mod); | |
1929 | if (err < 0) | |
1930 | goto cleanup; | |
1931 | ||
1932 | /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ | |
1933 | mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms); | |
1934 | mod->syms = (void *)sechdrs[exportindex].sh_addr; | |
1935 | if (crcindex) | |
1936 | mod->crcs = (void *)sechdrs[crcindex].sh_addr; | |
1937 | mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms); | |
1938 | mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr; | |
1939 | if (gplcrcindex) | |
1940 | mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr; | |
9f28bb7e GKH |
1941 | mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size / |
1942 | sizeof(*mod->gpl_future_syms); | |
f71d20e9 AV |
1943 | mod->num_unused_syms = sechdrs[unusedindex].sh_size / |
1944 | sizeof(*mod->unused_syms); | |
1945 | mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size / | |
1946 | sizeof(*mod->unused_gpl_syms); | |
9f28bb7e GKH |
1947 | mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr; |
1948 | if (gplfuturecrcindex) | |
1949 | mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr; | |
1da177e4 | 1950 | |
f71d20e9 AV |
1951 | mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr; |
1952 | if (unusedcrcindex) | |
1953 | mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr; | |
1954 | mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr; | |
1955 | if (unusedgplcrcindex) | |
1956 | mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr; | |
1957 | ||
1da177e4 | 1958 | #ifdef CONFIG_MODVERSIONS |
22a8bdeb | 1959 | if ((mod->num_syms && !crcindex) || |
9f28bb7e | 1960 | (mod->num_gpl_syms && !gplcrcindex) || |
f71d20e9 AV |
1961 | (mod->num_gpl_future_syms && !gplfuturecrcindex) || |
1962 | (mod->num_unused_syms && !unusedcrcindex) || | |
1963 | (mod->num_unused_gpl_syms && !unusedgplcrcindex)) { | |
1da177e4 LT |
1964 | printk(KERN_WARNING "%s: No versions for exported symbols." |
1965 | " Tainting kernel.\n", mod->name); | |
fa3ba2e8 | 1966 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1da177e4 LT |
1967 | } |
1968 | #endif | |
8256e47c MD |
1969 | markersindex = find_sec(hdr, sechdrs, secstrings, "__markers"); |
1970 | markersstringsindex = find_sec(hdr, sechdrs, secstrings, | |
1971 | "__markers_strings"); | |
1da177e4 LT |
1972 | |
1973 | /* Now do relocations. */ | |
1974 | for (i = 1; i < hdr->e_shnum; i++) { | |
1975 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
1976 | unsigned int info = sechdrs[i].sh_info; | |
1977 | ||
1978 | /* Not a valid relocation section? */ | |
1979 | if (info >= hdr->e_shnum) | |
1980 | continue; | |
1981 | ||
1982 | /* Don't bother with non-allocated sections */ | |
1983 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
1984 | continue; | |
1985 | ||
1986 | if (sechdrs[i].sh_type == SHT_REL) | |
1987 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
1988 | else if (sechdrs[i].sh_type == SHT_RELA) | |
1989 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
1990 | mod); | |
1991 | if (err < 0) | |
1992 | goto cleanup; | |
1993 | } | |
8256e47c MD |
1994 | #ifdef CONFIG_MARKERS |
1995 | mod->markers = (void *)sechdrs[markersindex].sh_addr; | |
1996 | mod->num_markers = | |
1997 | sechdrs[markersindex].sh_size / sizeof(*mod->markers); | |
1998 | #endif | |
1da177e4 | 1999 | |
eea8b54d AN |
2000 | /* Find duplicate symbols */ |
2001 | err = verify_export_symbols(mod); | |
2002 | ||
2003 | if (err < 0) | |
2004 | goto cleanup; | |
2005 | ||
1da177e4 LT |
2006 | /* Set up and sort exception table */ |
2007 | mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable); | |
2008 | mod->extable = extable = (void *)sechdrs[exindex].sh_addr; | |
2009 | sort_extable(extable, extable + mod->num_exentries); | |
2010 | ||
2011 | /* Finally, copy percpu area over. */ | |
2012 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, | |
2013 | sechdrs[pcpuindex].sh_size); | |
2014 | ||
2015 | add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); | |
2016 | ||
8256e47c MD |
2017 | #ifdef CONFIG_MARKERS |
2018 | if (!mod->taints) | |
2019 | marker_update_probe_range(mod->markers, | |
2020 | mod->markers + mod->num_markers, NULL, NULL); | |
2021 | #endif | |
1da177e4 LT |
2022 | err = module_finalize(hdr, sechdrs, mod); |
2023 | if (err < 0) | |
2024 | goto cleanup; | |
2025 | ||
378bac82 TK |
2026 | /* flush the icache in correct context */ |
2027 | old_fs = get_fs(); | |
2028 | set_fs(KERNEL_DS); | |
2029 | ||
2030 | /* | |
2031 | * Flush the instruction cache, since we've played with text. | |
2032 | * Do it before processing of module parameters, so the module | |
2033 | * can provide parameter accessor functions of its own. | |
2034 | */ | |
2035 | if (mod->module_init) | |
2036 | flush_icache_range((unsigned long)mod->module_init, | |
2037 | (unsigned long)mod->module_init | |
2038 | + mod->init_size); | |
2039 | flush_icache_range((unsigned long)mod->module_core, | |
2040 | (unsigned long)mod->module_core + mod->core_size); | |
2041 | ||
2042 | set_fs(old_fs); | |
2043 | ||
1da177e4 | 2044 | mod->args = args; |
8d3b33f6 RR |
2045 | if (obsparmindex) |
2046 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", | |
2047 | mod->name); | |
2048 | ||
bb9d3d56 RR |
2049 | /* Now sew it into the lists so we can get lockdep and oops |
2050 | * info during argument parsing. Noone should access us, since | |
2051 | * strong_try_module_get() will fail. */ | |
2052 | stop_machine_run(__link_module, mod, NR_CPUS); | |
2053 | ||
8d3b33f6 RR |
2054 | /* Size of section 0 is 0, so this works well if no params */ |
2055 | err = parse_args(mod->name, mod->args, | |
2056 | (struct kernel_param *) | |
2057 | sechdrs[setupindex].sh_addr, | |
2058 | sechdrs[setupindex].sh_size | |
2059 | / sizeof(struct kernel_param), | |
2060 | NULL); | |
1da177e4 | 2061 | if (err < 0) |
bb9d3d56 | 2062 | goto unlink; |
1da177e4 | 2063 | |
22a8bdeb | 2064 | err = mod_sysfs_setup(mod, |
1da177e4 LT |
2065 | (struct kernel_param *) |
2066 | sechdrs[setupindex].sh_addr, | |
2067 | sechdrs[setupindex].sh_size | |
2068 | / sizeof(struct kernel_param)); | |
2069 | if (err < 0) | |
bb9d3d56 | 2070 | goto unlink; |
1da177e4 | 2071 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
6d760133 | 2072 | add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
1da177e4 | 2073 | |
4552d5dc JB |
2074 | /* Size of section 0 is 0, so this works well if no unwind info. */ |
2075 | mod->unwind_info = unwind_add_table(mod, | |
22a8bdeb DW |
2076 | (void *)sechdrs[unwindex].sh_addr, |
2077 | sechdrs[unwindex].sh_size); | |
4552d5dc | 2078 | |
1da177e4 LT |
2079 | /* Get rid of temporary copy */ |
2080 | vfree(hdr); | |
2081 | ||
2082 | /* Done! */ | |
2083 | return mod; | |
2084 | ||
bb9d3d56 RR |
2085 | unlink: |
2086 | stop_machine_run(__unlink_module, mod, NR_CPUS); | |
1da177e4 LT |
2087 | module_arch_cleanup(mod); |
2088 | cleanup: | |
97c146ef KS |
2089 | kobject_del(&mod->mkobj.kobj); |
2090 | kobject_put(&mod->mkobj.kobj); | |
2091 | free_unload: | |
1da177e4 LT |
2092 | module_unload_free(mod); |
2093 | module_free(mod, mod->module_init); | |
2094 | free_core: | |
2095 | module_free(mod, mod->module_core); | |
2096 | free_percpu: | |
2097 | if (percpu) | |
2098 | percpu_modfree(percpu); | |
2099 | free_mod: | |
2100 | kfree(args); | |
2101 | free_hdr: | |
2102 | vfree(hdr); | |
6fe2e70b | 2103 | return ERR_PTR(err); |
1da177e4 LT |
2104 | |
2105 | truncated: | |
2106 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
2107 | err = -ENOEXEC; | |
2108 | goto free_hdr; | |
2109 | } | |
2110 | ||
1da177e4 LT |
2111 | /* This is where the real work happens */ |
2112 | asmlinkage long | |
2113 | sys_init_module(void __user *umod, | |
2114 | unsigned long len, | |
2115 | const char __user *uargs) | |
2116 | { | |
2117 | struct module *mod; | |
2118 | int ret = 0; | |
2119 | ||
2120 | /* Must have permission */ | |
2121 | if (!capable(CAP_SYS_MODULE)) | |
2122 | return -EPERM; | |
2123 | ||
2124 | /* Only one module load at a time, please */ | |
6389a385 | 2125 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
2126 | return -EINTR; |
2127 | ||
2128 | /* Do all the hard work */ | |
2129 | mod = load_module(umod, len, uargs); | |
2130 | if (IS_ERR(mod)) { | |
6389a385 | 2131 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2132 | return PTR_ERR(mod); |
2133 | } | |
2134 | ||
1da177e4 | 2135 | /* Drop lock so they can recurse */ |
6389a385 | 2136 | mutex_unlock(&module_mutex); |
1da177e4 | 2137 | |
e041c683 AS |
2138 | blocking_notifier_call_chain(&module_notify_list, |
2139 | MODULE_STATE_COMING, mod); | |
1da177e4 LT |
2140 | |
2141 | /* Start the module */ | |
2142 | if (mod->init != NULL) | |
2143 | ret = mod->init(); | |
2144 | if (ret < 0) { | |
2145 | /* Init routine failed: abort. Try to protect us from | |
2146 | buggy refcounters. */ | |
2147 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2148 | synchronize_sched(); |
af49d924 RR |
2149 | module_put(mod); |
2150 | mutex_lock(&module_mutex); | |
2151 | free_module(mod); | |
2152 | mutex_unlock(&module_mutex); | |
c9a3ba55 | 2153 | wake_up(&module_wq); |
1da177e4 LT |
2154 | return ret; |
2155 | } | |
2156 | ||
2157 | /* Now it's a first class citizen! */ | |
6389a385 | 2158 | mutex_lock(&module_mutex); |
1da177e4 LT |
2159 | mod->state = MODULE_STATE_LIVE; |
2160 | /* Drop initial reference. */ | |
2161 | module_put(mod); | |
4552d5dc | 2162 | unwind_remove_table(mod->unwind_info, 1); |
1da177e4 LT |
2163 | module_free(mod, mod->module_init); |
2164 | mod->module_init = NULL; | |
2165 | mod->init_size = 0; | |
2166 | mod->init_text_size = 0; | |
6389a385 | 2167 | mutex_unlock(&module_mutex); |
c9a3ba55 | 2168 | wake_up(&module_wq); |
1da177e4 LT |
2169 | |
2170 | return 0; | |
2171 | } | |
2172 | ||
2173 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2174 | { | |
2175 | return ((void *)addr >= start && (void *)addr < start + size); | |
2176 | } | |
2177 | ||
2178 | #ifdef CONFIG_KALLSYMS | |
2179 | /* | |
2180 | * This ignores the intensely annoying "mapping symbols" found | |
2181 | * in ARM ELF files: $a, $t and $d. | |
2182 | */ | |
2183 | static inline int is_arm_mapping_symbol(const char *str) | |
2184 | { | |
22a8bdeb | 2185 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2186 | && (str[2] == '\0' || str[2] == '.'); |
2187 | } | |
2188 | ||
2189 | static const char *get_ksymbol(struct module *mod, | |
2190 | unsigned long addr, | |
2191 | unsigned long *size, | |
2192 | unsigned long *offset) | |
2193 | { | |
2194 | unsigned int i, best = 0; | |
2195 | unsigned long nextval; | |
2196 | ||
2197 | /* At worse, next value is at end of module */ | |
2198 | if (within(addr, mod->module_init, mod->init_size)) | |
2199 | nextval = (unsigned long)mod->module_init+mod->init_text_size; | |
22a8bdeb | 2200 | else |
1da177e4 LT |
2201 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2202 | ||
2203 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
22a8bdeb | 2204 | starts real symbols at 1). */ |
1da177e4 LT |
2205 | for (i = 1; i < mod->num_symtab; i++) { |
2206 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2207 | continue; | |
2208 | ||
2209 | /* We ignore unnamed symbols: they're uninformative | |
2210 | * and inserted at a whim. */ | |
2211 | if (mod->symtab[i].st_value <= addr | |
2212 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2213 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2214 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2215 | best = i; | |
2216 | if (mod->symtab[i].st_value > addr | |
2217 | && mod->symtab[i].st_value < nextval | |
2218 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2219 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2220 | nextval = mod->symtab[i].st_value; | |
2221 | } | |
2222 | ||
2223 | if (!best) | |
2224 | return NULL; | |
2225 | ||
ffb45122 AD |
2226 | if (size) |
2227 | *size = nextval - mod->symtab[best].st_value; | |
2228 | if (offset) | |
2229 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2230 | return mod->strtab + mod->symtab[best].st_name; |
2231 | } | |
2232 | ||
6dd06c9f RR |
2233 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2234 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
2235 | char *module_address_lookup(unsigned long addr, | |
2236 | unsigned long *size, | |
2237 | unsigned long *offset, | |
2238 | char **modname, | |
2239 | char *namebuf) | |
1da177e4 LT |
2240 | { |
2241 | struct module *mod; | |
cb2a5205 | 2242 | const char *ret = NULL; |
1da177e4 | 2243 | |
cb2a5205 | 2244 | preempt_disable(); |
1da177e4 LT |
2245 | list_for_each_entry(mod, &modules, list) { |
2246 | if (within(addr, mod->module_init, mod->init_size) | |
2247 | || within(addr, mod->module_core, mod->core_size)) { | |
ffc50891 FBH |
2248 | if (modname) |
2249 | *modname = mod->name; | |
cb2a5205 RR |
2250 | ret = get_ksymbol(mod, addr, size, offset); |
2251 | break; | |
1da177e4 LT |
2252 | } |
2253 | } | |
6dd06c9f RR |
2254 | /* Make a copy in here where it's safe */ |
2255 | if (ret) { | |
2256 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
2257 | ret = namebuf; | |
2258 | } | |
cb2a5205 | 2259 | preempt_enable(); |
6dd06c9f | 2260 | return (char *)ret; |
1da177e4 LT |
2261 | } |
2262 | ||
9d65cb4a AD |
2263 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2264 | { | |
2265 | struct module *mod; | |
2266 | ||
cb2a5205 | 2267 | preempt_disable(); |
9d65cb4a AD |
2268 | list_for_each_entry(mod, &modules, list) { |
2269 | if (within(addr, mod->module_init, mod->init_size) || | |
2270 | within(addr, mod->module_core, mod->core_size)) { | |
2271 | const char *sym; | |
2272 | ||
2273 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2274 | if (!sym) | |
2275 | goto out; | |
9281acea | 2276 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 2277 | preempt_enable(); |
9d65cb4a AD |
2278 | return 0; |
2279 | } | |
2280 | } | |
2281 | out: | |
cb2a5205 | 2282 | preempt_enable(); |
9d65cb4a AD |
2283 | return -ERANGE; |
2284 | } | |
2285 | ||
a5c43dae AD |
2286 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2287 | unsigned long *offset, char *modname, char *name) | |
2288 | { | |
2289 | struct module *mod; | |
2290 | ||
cb2a5205 | 2291 | preempt_disable(); |
a5c43dae AD |
2292 | list_for_each_entry(mod, &modules, list) { |
2293 | if (within(addr, mod->module_init, mod->init_size) || | |
2294 | within(addr, mod->module_core, mod->core_size)) { | |
2295 | const char *sym; | |
2296 | ||
2297 | sym = get_ksymbol(mod, addr, size, offset); | |
2298 | if (!sym) | |
2299 | goto out; | |
2300 | if (modname) | |
9281acea | 2301 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 2302 | if (name) |
9281acea | 2303 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 2304 | preempt_enable(); |
a5c43dae AD |
2305 | return 0; |
2306 | } | |
2307 | } | |
2308 | out: | |
cb2a5205 | 2309 | preempt_enable(); |
a5c43dae AD |
2310 | return -ERANGE; |
2311 | } | |
2312 | ||
ea07890a AD |
2313 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2314 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2315 | { |
2316 | struct module *mod; | |
2317 | ||
cb2a5205 | 2318 | preempt_disable(); |
1da177e4 LT |
2319 | list_for_each_entry(mod, &modules, list) { |
2320 | if (symnum < mod->num_symtab) { | |
2321 | *value = mod->symtab[symnum].st_value; | |
2322 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2323 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
2324 | KSYM_NAME_LEN); |
2325 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ea07890a | 2326 | *exported = is_exported(name, mod); |
cb2a5205 | 2327 | preempt_enable(); |
ea07890a | 2328 | return 0; |
1da177e4 LT |
2329 | } |
2330 | symnum -= mod->num_symtab; | |
2331 | } | |
cb2a5205 | 2332 | preempt_enable(); |
ea07890a | 2333 | return -ERANGE; |
1da177e4 LT |
2334 | } |
2335 | ||
2336 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2337 | { | |
2338 | unsigned int i; | |
2339 | ||
2340 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2341 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2342 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2343 | return mod->symtab[i].st_value; |
2344 | return 0; | |
2345 | } | |
2346 | ||
2347 | /* Look for this name: can be of form module:name. */ | |
2348 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2349 | { | |
2350 | struct module *mod; | |
2351 | char *colon; | |
2352 | unsigned long ret = 0; | |
2353 | ||
2354 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 2355 | preempt_disable(); |
1da177e4 LT |
2356 | if ((colon = strchr(name, ':')) != NULL) { |
2357 | *colon = '\0'; | |
2358 | if ((mod = find_module(name)) != NULL) | |
2359 | ret = mod_find_symname(mod, colon+1); | |
2360 | *colon = ':'; | |
2361 | } else { | |
2362 | list_for_each_entry(mod, &modules, list) | |
2363 | if ((ret = mod_find_symname(mod, name)) != 0) | |
2364 | break; | |
2365 | } | |
cb2a5205 | 2366 | preempt_enable(); |
1da177e4 LT |
2367 | return ret; |
2368 | } | |
2369 | #endif /* CONFIG_KALLSYMS */ | |
2370 | ||
2371 | /* Called by the /proc file system to return a list of modules. */ | |
2372 | static void *m_start(struct seq_file *m, loff_t *pos) | |
2373 | { | |
6389a385 | 2374 | mutex_lock(&module_mutex); |
708f4b52 | 2375 | return seq_list_start(&modules, *pos); |
1da177e4 LT |
2376 | } |
2377 | ||
2378 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
2379 | { | |
708f4b52 | 2380 | return seq_list_next(p, &modules, pos); |
1da177e4 LT |
2381 | } |
2382 | ||
2383 | static void m_stop(struct seq_file *m, void *p) | |
2384 | { | |
6389a385 | 2385 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2386 | } |
2387 | ||
21aa9280 | 2388 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
2389 | { |
2390 | int bx = 0; | |
2391 | ||
21aa9280 AV |
2392 | if (mod->taints || |
2393 | mod->state == MODULE_STATE_GOING || | |
2394 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 2395 | buf[bx++] = '('; |
21aa9280 | 2396 | if (mod->taints & TAINT_PROPRIETARY_MODULE) |
fa3ba2e8 | 2397 | buf[bx++] = 'P'; |
21aa9280 | 2398 | if (mod->taints & TAINT_FORCED_MODULE) |
fa3ba2e8 FM |
2399 | buf[bx++] = 'F'; |
2400 | /* | |
2401 | * TAINT_FORCED_RMMOD: could be added. | |
2402 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
2403 | * apply to modules. | |
2404 | */ | |
21aa9280 AV |
2405 | |
2406 | /* Show a - for module-is-being-unloaded */ | |
2407 | if (mod->state == MODULE_STATE_GOING) | |
2408 | buf[bx++] = '-'; | |
2409 | /* Show a + for module-is-being-loaded */ | |
2410 | if (mod->state == MODULE_STATE_COMING) | |
2411 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
2412 | buf[bx++] = ')'; |
2413 | } | |
2414 | buf[bx] = '\0'; | |
2415 | ||
2416 | return buf; | |
2417 | } | |
2418 | ||
1da177e4 LT |
2419 | static int m_show(struct seq_file *m, void *p) |
2420 | { | |
2421 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
2422 | char buf[8]; |
2423 | ||
1da177e4 LT |
2424 | seq_printf(m, "%s %lu", |
2425 | mod->name, mod->init_size + mod->core_size); | |
2426 | print_unload_info(m, mod); | |
2427 | ||
2428 | /* Informative for users. */ | |
2429 | seq_printf(m, " %s", | |
2430 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2431 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2432 | "Live"); | |
2433 | /* Used by oprofile and other similar tools. */ | |
2434 | seq_printf(m, " 0x%p", mod->module_core); | |
2435 | ||
fa3ba2e8 FM |
2436 | /* Taints info */ |
2437 | if (mod->taints) | |
21aa9280 | 2438 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 2439 | |
1da177e4 LT |
2440 | seq_printf(m, "\n"); |
2441 | return 0; | |
2442 | } | |
2443 | ||
2444 | /* Format: modulename size refcount deps address | |
2445 | ||
2446 | Where refcount is a number or -, and deps is a comma-separated list | |
2447 | of depends or -. | |
2448 | */ | |
15ad7cdc | 2449 | const struct seq_operations modules_op = { |
1da177e4 LT |
2450 | .start = m_start, |
2451 | .next = m_next, | |
2452 | .stop = m_stop, | |
2453 | .show = m_show | |
2454 | }; | |
2455 | ||
2456 | /* Given an address, look for it in the module exception tables. */ | |
2457 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2458 | { | |
1da177e4 LT |
2459 | const struct exception_table_entry *e = NULL; |
2460 | struct module *mod; | |
2461 | ||
24da1cbf | 2462 | preempt_disable(); |
1da177e4 LT |
2463 | list_for_each_entry(mod, &modules, list) { |
2464 | if (mod->num_exentries == 0) | |
2465 | continue; | |
22a8bdeb | 2466 | |
1da177e4 LT |
2467 | e = search_extable(mod->extable, |
2468 | mod->extable + mod->num_exentries - 1, | |
2469 | addr); | |
2470 | if (e) | |
2471 | break; | |
2472 | } | |
24da1cbf | 2473 | preempt_enable(); |
1da177e4 LT |
2474 | |
2475 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 2476 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
2477 | return e; |
2478 | } | |
2479 | ||
4d435f9d IM |
2480 | /* |
2481 | * Is this a valid module address? | |
2482 | */ | |
2483 | int is_module_address(unsigned long addr) | |
2484 | { | |
4d435f9d IM |
2485 | struct module *mod; |
2486 | ||
24da1cbf | 2487 | preempt_disable(); |
4d435f9d IM |
2488 | |
2489 | list_for_each_entry(mod, &modules, list) { | |
2490 | if (within(addr, mod->module_core, mod->core_size)) { | |
24da1cbf | 2491 | preempt_enable(); |
4d435f9d IM |
2492 | return 1; |
2493 | } | |
2494 | } | |
2495 | ||
24da1cbf | 2496 | preempt_enable(); |
4d435f9d IM |
2497 | |
2498 | return 0; | |
2499 | } | |
2500 | ||
2501 | ||
24da1cbf | 2502 | /* Is this a valid kernel address? */ |
1da177e4 LT |
2503 | struct module *__module_text_address(unsigned long addr) |
2504 | { | |
2505 | struct module *mod; | |
2506 | ||
2507 | list_for_each_entry(mod, &modules, list) | |
2508 | if (within(addr, mod->module_init, mod->init_text_size) | |
2509 | || within(addr, mod->module_core, mod->core_text_size)) | |
2510 | return mod; | |
2511 | return NULL; | |
2512 | } | |
2513 | ||
2514 | struct module *module_text_address(unsigned long addr) | |
2515 | { | |
2516 | struct module *mod; | |
1da177e4 | 2517 | |
24da1cbf | 2518 | preempt_disable(); |
1da177e4 | 2519 | mod = __module_text_address(addr); |
24da1cbf | 2520 | preempt_enable(); |
1da177e4 LT |
2521 | |
2522 | return mod; | |
2523 | } | |
2524 | ||
2525 | /* Don't grab lock, we're oopsing. */ | |
2526 | void print_modules(void) | |
2527 | { | |
2528 | struct module *mod; | |
2bc2d61a | 2529 | char buf[8]; |
1da177e4 LT |
2530 | |
2531 | printk("Modules linked in:"); | |
2532 | list_for_each_entry(mod, &modules, list) | |
21aa9280 | 2533 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
e14af7ee AV |
2534 | if (last_unloaded_module[0]) |
2535 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
2536 | printk("\n"); |
2537 | } | |
2538 | ||
1da177e4 LT |
2539 | #ifdef CONFIG_MODVERSIONS |
2540 | /* Generate the signature for struct module here, too, for modversions. */ | |
2541 | void struct_module(struct module *mod) { return; } | |
2542 | EXPORT_SYMBOL(struct_module); | |
2543 | #endif | |
8256e47c MD |
2544 | |
2545 | #ifdef CONFIG_MARKERS | |
2546 | void module_update_markers(struct module *probe_module, int *refcount) | |
2547 | { | |
2548 | struct module *mod; | |
2549 | ||
2550 | mutex_lock(&module_mutex); | |
2551 | list_for_each_entry(mod, &modules, list) | |
2552 | if (!mod->taints) | |
2553 | marker_update_probe_range(mod->markers, | |
2554 | mod->markers + mod->num_markers, | |
2555 | probe_module, refcount); | |
2556 | mutex_unlock(&module_mutex); | |
2557 | } | |
2558 | #endif |