]>
Commit | Line | Data |
---|---|---|
f71d20e9 | 1 | /* |
1da177e4 LT |
2 | Copyright (C) 2002 Richard Henderson |
3 | Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/moduleloader.h> | |
21 | #include <linux/init.h> | |
ae84e324 | 22 | #include <linux/kallsyms.h> |
3b5d5c6b | 23 | #include <linux/fs.h> |
6d760133 | 24 | #include <linux/sysfs.h> |
9f158333 | 25 | #include <linux/kernel.h> |
1da177e4 LT |
26 | #include <linux/slab.h> |
27 | #include <linux/vmalloc.h> | |
28 | #include <linux/elf.h> | |
3b5d5c6b | 29 | #include <linux/proc_fs.h> |
1da177e4 LT |
30 | #include <linux/seq_file.h> |
31 | #include <linux/syscalls.h> | |
32 | #include <linux/fcntl.h> | |
33 | #include <linux/rcupdate.h> | |
c59ede7b | 34 | #include <linux/capability.h> |
1da177e4 LT |
35 | #include <linux/cpu.h> |
36 | #include <linux/moduleparam.h> | |
37 | #include <linux/errno.h> | |
38 | #include <linux/err.h> | |
39 | #include <linux/vermagic.h> | |
40 | #include <linux/notifier.h> | |
f6a57033 | 41 | #include <linux/sched.h> |
1da177e4 LT |
42 | #include <linux/stop_machine.h> |
43 | #include <linux/device.h> | |
c988d2b2 | 44 | #include <linux/string.h> |
97d1f15b | 45 | #include <linux/mutex.h> |
d72b3751 | 46 | #include <linux/rculist.h> |
1da177e4 | 47 | #include <asm/uaccess.h> |
1da177e4 | 48 | #include <asm/cacheflush.h> |
b817f6fe | 49 | #include <linux/license.h> |
6d762394 | 50 | #include <asm/sections.h> |
97e1c18e | 51 | #include <linux/tracepoint.h> |
90d595fe | 52 | #include <linux/ftrace.h> |
22a9d645 | 53 | #include <linux/async.h> |
1da177e4 LT |
54 | |
55 | #if 0 | |
56 | #define DEBUGP printk | |
57 | #else | |
58 | #define DEBUGP(fmt , a...) | |
59 | #endif | |
60 | ||
61 | #ifndef ARCH_SHF_SMALL | |
62 | #define ARCH_SHF_SMALL 0 | |
63 | #endif | |
64 | ||
65 | /* If this is set, the section belongs in the init part of the module */ | |
66 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
67 | ||
24da1cbf | 68 | /* List of modules, protected by module_mutex or preempt_disable |
d72b3751 | 69 | * (delete uses stop_machine/add uses RCU list operations). */ |
6389a385 | 70 | static DEFINE_MUTEX(module_mutex); |
1da177e4 LT |
71 | static LIST_HEAD(modules); |
72 | ||
c9a3ba55 RR |
73 | /* Waiting for a module to finish initializing? */ |
74 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
75 | ||
e041c683 | 76 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 77 | |
3a642e99 RR |
78 | /* Bounds of module allocation, for speeding __module_text_address */ |
79 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; | |
80 | ||
1da177e4 LT |
81 | int register_module_notifier(struct notifier_block * nb) |
82 | { | |
e041c683 | 83 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
84 | } |
85 | EXPORT_SYMBOL(register_module_notifier); | |
86 | ||
87 | int unregister_module_notifier(struct notifier_block * nb) | |
88 | { | |
e041c683 | 89 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
90 | } |
91 | EXPORT_SYMBOL(unregister_module_notifier); | |
92 | ||
9a4b9708 ML |
93 | /* We require a truly strong try_module_get(): 0 means failure due to |
94 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
95 | static inline int strong_try_module_get(struct module *mod) |
96 | { | |
97 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
98 | return -EBUSY; |
99 | if (try_module_get(mod)) | |
1da177e4 | 100 | return 0; |
c9a3ba55 RR |
101 | else |
102 | return -ENOENT; | |
1da177e4 LT |
103 | } |
104 | ||
fa3ba2e8 FM |
105 | static inline void add_taint_module(struct module *mod, unsigned flag) |
106 | { | |
107 | add_taint(flag); | |
25ddbb18 | 108 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
109 | } |
110 | ||
02a3e59a RD |
111 | /* |
112 | * A thread that wants to hold a reference to a module only while it | |
113 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
114 | */ |
115 | void __module_put_and_exit(struct module *mod, long code) | |
116 | { | |
117 | module_put(mod); | |
118 | do_exit(code); | |
119 | } | |
120 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 121 | |
1da177e4 LT |
122 | /* Find a module section: 0 means not found. */ |
123 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
124 | Elf_Shdr *sechdrs, | |
125 | const char *secstrings, | |
126 | const char *name) | |
127 | { | |
128 | unsigned int i; | |
129 | ||
130 | for (i = 1; i < hdr->e_shnum; i++) | |
131 | /* Alloc bit cleared means "ignore it." */ | |
132 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
133 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
134 | return i; | |
135 | return 0; | |
136 | } | |
137 | ||
5e458cc0 RR |
138 | /* Find a module section, or NULL. */ |
139 | static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs, | |
140 | const char *secstrings, const char *name) | |
141 | { | |
142 | /* Section 0 has sh_addr 0. */ | |
143 | return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr; | |
144 | } | |
145 | ||
146 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
147 | static void *section_objs(Elf_Ehdr *hdr, | |
148 | Elf_Shdr *sechdrs, | |
149 | const char *secstrings, | |
150 | const char *name, | |
151 | size_t object_size, | |
152 | unsigned int *num) | |
153 | { | |
154 | unsigned int sec = find_sec(hdr, sechdrs, secstrings, name); | |
155 | ||
156 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
157 | *num = sechdrs[sec].sh_size / object_size; | |
158 | return (void *)sechdrs[sec].sh_addr; | |
159 | } | |
160 | ||
1da177e4 LT |
161 | /* Provided by the linker */ |
162 | extern const struct kernel_symbol __start___ksymtab[]; | |
163 | extern const struct kernel_symbol __stop___ksymtab[]; | |
164 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
165 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
166 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
167 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
f71d20e9 AV |
168 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
169 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
170 | extern const unsigned long __start___kcrctab[]; |
171 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 172 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
173 | #ifdef CONFIG_UNUSED_SYMBOLS |
174 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
175 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
176 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
177 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
178 | extern const unsigned long __start___kcrctab_unused[]; |
179 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 180 | #endif |
1da177e4 LT |
181 | |
182 | #ifndef CONFIG_MODVERSIONS | |
183 | #define symversion(base, idx) NULL | |
184 | #else | |
f83ca9fe | 185 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
186 | #endif |
187 | ||
ad9546c9 RR |
188 | struct symsearch { |
189 | const struct kernel_symbol *start, *stop; | |
190 | const unsigned long *crcs; | |
dafd0940 RR |
191 | enum { |
192 | NOT_GPL_ONLY, | |
193 | GPL_ONLY, | |
194 | WILL_BE_GPL_ONLY, | |
195 | } licence; | |
196 | bool unused; | |
ad9546c9 RR |
197 | }; |
198 | ||
dafd0940 RR |
199 | static bool each_symbol_in_section(const struct symsearch *arr, |
200 | unsigned int arrsize, | |
201 | struct module *owner, | |
202 | bool (*fn)(const struct symsearch *syms, | |
203 | struct module *owner, | |
204 | unsigned int symnum, void *data), | |
205 | void *data) | |
ad9546c9 | 206 | { |
dafd0940 | 207 | unsigned int i, j; |
ad9546c9 | 208 | |
dafd0940 RR |
209 | for (j = 0; j < arrsize; j++) { |
210 | for (i = 0; i < arr[j].stop - arr[j].start; i++) | |
211 | if (fn(&arr[j], owner, i, data)) | |
212 | return true; | |
f71d20e9 | 213 | } |
dafd0940 RR |
214 | |
215 | return false; | |
ad9546c9 RR |
216 | } |
217 | ||
dafd0940 RR |
218 | /* Returns true as soon as fn returns true, otherwise false. */ |
219 | static bool each_symbol(bool (*fn)(const struct symsearch *arr, | |
220 | struct module *owner, | |
221 | unsigned int symnum, void *data), | |
222 | void *data) | |
ad9546c9 RR |
223 | { |
224 | struct module *mod; | |
ad9546c9 RR |
225 | const struct symsearch arr[] = { |
226 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, | |
dafd0940 | 227 | NOT_GPL_ONLY, false }, |
ad9546c9 | 228 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
229 | __start___kcrctab_gpl, |
230 | GPL_ONLY, false }, | |
ad9546c9 | 231 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
232 | __start___kcrctab_gpl_future, |
233 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 234 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 235 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
236 | __start___kcrctab_unused, |
237 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 238 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
239 | __start___kcrctab_unused_gpl, |
240 | GPL_ONLY, true }, | |
f7f5b675 | 241 | #endif |
ad9546c9 | 242 | }; |
f71d20e9 | 243 | |
dafd0940 RR |
244 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
245 | return true; | |
f71d20e9 | 246 | |
d72b3751 | 247 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
248 | struct symsearch arr[] = { |
249 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 250 | NOT_GPL_ONLY, false }, |
ad9546c9 | 251 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
252 | mod->gpl_crcs, |
253 | GPL_ONLY, false }, | |
ad9546c9 RR |
254 | { mod->gpl_future_syms, |
255 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
256 | mod->gpl_future_crcs, |
257 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 258 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
259 | { mod->unused_syms, |
260 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
261 | mod->unused_crcs, |
262 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
263 | { mod->unused_gpl_syms, |
264 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
265 | mod->unused_gpl_crcs, |
266 | GPL_ONLY, true }, | |
f7f5b675 | 267 | #endif |
ad9546c9 RR |
268 | }; |
269 | ||
dafd0940 RR |
270 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
271 | return true; | |
272 | } | |
273 | return false; | |
274 | } | |
275 | ||
276 | struct find_symbol_arg { | |
277 | /* Input */ | |
278 | const char *name; | |
279 | bool gplok; | |
280 | bool warn; | |
281 | ||
282 | /* Output */ | |
283 | struct module *owner; | |
284 | const unsigned long *crc; | |
285 | unsigned long value; | |
286 | }; | |
287 | ||
288 | static bool find_symbol_in_section(const struct symsearch *syms, | |
289 | struct module *owner, | |
290 | unsigned int symnum, void *data) | |
291 | { | |
292 | struct find_symbol_arg *fsa = data; | |
293 | ||
294 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) | |
295 | return false; | |
296 | ||
297 | if (!fsa->gplok) { | |
298 | if (syms->licence == GPL_ONLY) | |
299 | return false; | |
300 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
301 | printk(KERN_WARNING "Symbol %s is being used " | |
302 | "by a non-GPL module, which will not " | |
303 | "be allowed in the future\n", fsa->name); | |
304 | printk(KERN_WARNING "Please see the file " | |
305 | "Documentation/feature-removal-schedule.txt " | |
306 | "in the kernel source tree for more details.\n"); | |
9f28bb7e | 307 | } |
1da177e4 | 308 | } |
ad9546c9 | 309 | |
f7f5b675 | 310 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
311 | if (syms->unused && fsa->warn) { |
312 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
313 | "however this module is using it.\n", fsa->name); | |
314 | printk(KERN_WARNING | |
315 | "This symbol will go away in the future.\n"); | |
316 | printk(KERN_WARNING | |
317 | "Please evalute if this is the right api to use and if " | |
318 | "it really is, submit a report the linux kernel " | |
319 | "mailinglist together with submitting your code for " | |
320 | "inclusion.\n"); | |
321 | } | |
f7f5b675 | 322 | #endif |
dafd0940 RR |
323 | |
324 | fsa->owner = owner; | |
325 | fsa->crc = symversion(syms->crcs, symnum); | |
326 | fsa->value = syms->start[symnum].value; | |
327 | return true; | |
328 | } | |
329 | ||
330 | /* Find a symbol, return value, (optional) crc and (optional) module | |
331 | * which owns it */ | |
332 | static unsigned long find_symbol(const char *name, | |
333 | struct module **owner, | |
334 | const unsigned long **crc, | |
335 | bool gplok, | |
336 | bool warn) | |
337 | { | |
338 | struct find_symbol_arg fsa; | |
339 | ||
340 | fsa.name = name; | |
341 | fsa.gplok = gplok; | |
342 | fsa.warn = warn; | |
343 | ||
344 | if (each_symbol(find_symbol_in_section, &fsa)) { | |
345 | if (owner) | |
346 | *owner = fsa.owner; | |
347 | if (crc) | |
348 | *crc = fsa.crc; | |
349 | return fsa.value; | |
350 | } | |
351 | ||
1da177e4 | 352 | DEBUGP("Failed to find symbol %s\n", name); |
88173507 | 353 | return -ENOENT; |
1da177e4 LT |
354 | } |
355 | ||
1da177e4 LT |
356 | /* Search for module by name: must hold module_mutex. */ |
357 | static struct module *find_module(const char *name) | |
358 | { | |
359 | struct module *mod; | |
360 | ||
361 | list_for_each_entry(mod, &modules, list) { | |
362 | if (strcmp(mod->name, name) == 0) | |
363 | return mod; | |
364 | } | |
365 | return NULL; | |
366 | } | |
367 | ||
368 | #ifdef CONFIG_SMP | |
369 | /* Number of blocks used and allocated. */ | |
370 | static unsigned int pcpu_num_used, pcpu_num_allocated; | |
371 | /* Size of each block. -ve means used. */ | |
372 | static int *pcpu_size; | |
373 | ||
374 | static int split_block(unsigned int i, unsigned short size) | |
375 | { | |
376 | /* Reallocation required? */ | |
377 | if (pcpu_num_used + 1 > pcpu_num_allocated) { | |
6d4f9c55 PE |
378 | int *new; |
379 | ||
380 | new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, | |
381 | GFP_KERNEL); | |
1da177e4 LT |
382 | if (!new) |
383 | return 0; | |
384 | ||
1da177e4 | 385 | pcpu_num_allocated *= 2; |
1da177e4 LT |
386 | pcpu_size = new; |
387 | } | |
388 | ||
389 | /* Insert a new subblock */ | |
390 | memmove(&pcpu_size[i+1], &pcpu_size[i], | |
391 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); | |
392 | pcpu_num_used++; | |
393 | ||
394 | pcpu_size[i+1] -= size; | |
395 | pcpu_size[i] = size; | |
396 | return 1; | |
397 | } | |
398 | ||
399 | static inline unsigned int block_size(int val) | |
400 | { | |
401 | if (val < 0) | |
402 | return -val; | |
403 | return val; | |
404 | } | |
405 | ||
842bbaaa RR |
406 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
407 | const char *name) | |
1da177e4 LT |
408 | { |
409 | unsigned long extra; | |
410 | unsigned int i; | |
411 | void *ptr; | |
412 | ||
b6e3590f JF |
413 | if (align > PAGE_SIZE) { |
414 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
415 | name, align, PAGE_SIZE); | |
416 | align = PAGE_SIZE; | |
842bbaaa | 417 | } |
1da177e4 LT |
418 | |
419 | ptr = __per_cpu_start; | |
420 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
421 | /* Extra for alignment requirement. */ | |
422 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; | |
423 | BUG_ON(i == 0 && extra != 0); | |
424 | ||
425 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) | |
426 | continue; | |
427 | ||
428 | /* Transfer extra to previous block. */ | |
429 | if (pcpu_size[i-1] < 0) | |
430 | pcpu_size[i-1] -= extra; | |
431 | else | |
432 | pcpu_size[i-1] += extra; | |
433 | pcpu_size[i] -= extra; | |
434 | ptr += extra; | |
435 | ||
436 | /* Split block if warranted */ | |
437 | if (pcpu_size[i] - size > sizeof(unsigned long)) | |
438 | if (!split_block(i, size)) | |
439 | return NULL; | |
440 | ||
441 | /* Mark allocated */ | |
442 | pcpu_size[i] = -pcpu_size[i]; | |
443 | return ptr; | |
444 | } | |
445 | ||
446 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", | |
447 | size); | |
448 | return NULL; | |
449 | } | |
450 | ||
451 | static void percpu_modfree(void *freeme) | |
452 | { | |
453 | unsigned int i; | |
454 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); | |
455 | ||
456 | /* First entry is core kernel percpu data. */ | |
457 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
458 | if (ptr == freeme) { | |
459 | pcpu_size[i] = -pcpu_size[i]; | |
460 | goto free; | |
461 | } | |
462 | } | |
463 | BUG(); | |
464 | ||
465 | free: | |
466 | /* Merge with previous? */ | |
467 | if (pcpu_size[i-1] >= 0) { | |
468 | pcpu_size[i-1] += pcpu_size[i]; | |
469 | pcpu_num_used--; | |
470 | memmove(&pcpu_size[i], &pcpu_size[i+1], | |
471 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); | |
472 | i--; | |
473 | } | |
474 | /* Merge with next? */ | |
475 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { | |
476 | pcpu_size[i] += pcpu_size[i+1]; | |
477 | pcpu_num_used--; | |
478 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], | |
479 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); | |
480 | } | |
481 | } | |
482 | ||
483 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
484 | Elf_Shdr *sechdrs, | |
485 | const char *secstrings) | |
486 | { | |
487 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); | |
488 | } | |
489 | ||
dd5af90a MT |
490 | static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size) |
491 | { | |
492 | int cpu; | |
493 | ||
494 | for_each_possible_cpu(cpu) | |
495 | memcpy(pcpudest + per_cpu_offset(cpu), from, size); | |
496 | } | |
497 | ||
1da177e4 LT |
498 | static int percpu_modinit(void) |
499 | { | |
500 | pcpu_num_used = 2; | |
501 | pcpu_num_allocated = 2; | |
502 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, | |
503 | GFP_KERNEL); | |
504 | /* Static in-kernel percpu data (used). */ | |
b00742d3 | 505 | pcpu_size[0] = -(__per_cpu_end-__per_cpu_start); |
1da177e4 LT |
506 | /* Free room. */ |
507 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; | |
508 | if (pcpu_size[1] < 0) { | |
509 | printk(KERN_ERR "No per-cpu room for modules.\n"); | |
510 | pcpu_num_used = 1; | |
511 | } | |
512 | ||
513 | return 0; | |
22a8bdeb | 514 | } |
1da177e4 LT |
515 | __initcall(percpu_modinit); |
516 | #else /* ... !CONFIG_SMP */ | |
842bbaaa RR |
517 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
518 | const char *name) | |
1da177e4 LT |
519 | { |
520 | return NULL; | |
521 | } | |
522 | static inline void percpu_modfree(void *pcpuptr) | |
523 | { | |
524 | BUG(); | |
525 | } | |
526 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
527 | Elf_Shdr *sechdrs, | |
528 | const char *secstrings) | |
529 | { | |
530 | return 0; | |
531 | } | |
532 | static inline void percpu_modcopy(void *pcpudst, const void *src, | |
533 | unsigned long size) | |
534 | { | |
535 | /* pcpusec should be 0, and size of that section should be 0. */ | |
536 | BUG_ON(size != 0); | |
537 | } | |
538 | #endif /* CONFIG_SMP */ | |
539 | ||
c988d2b2 MD |
540 | #define MODINFO_ATTR(field) \ |
541 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
542 | { \ | |
543 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
544 | } \ | |
545 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
546 | struct module *mod, char *buffer) \ | |
547 | { \ | |
548 | return sprintf(buffer, "%s\n", mod->field); \ | |
549 | } \ | |
550 | static int modinfo_##field##_exists(struct module *mod) \ | |
551 | { \ | |
552 | return mod->field != NULL; \ | |
553 | } \ | |
554 | static void free_modinfo_##field(struct module *mod) \ | |
555 | { \ | |
22a8bdeb DW |
556 | kfree(mod->field); \ |
557 | mod->field = NULL; \ | |
c988d2b2 MD |
558 | } \ |
559 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 560 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
561 | .show = show_modinfo_##field, \ |
562 | .setup = setup_modinfo_##field, \ | |
563 | .test = modinfo_##field##_exists, \ | |
564 | .free = free_modinfo_##field, \ | |
565 | }; | |
566 | ||
567 | MODINFO_ATTR(version); | |
568 | MODINFO_ATTR(srcversion); | |
569 | ||
e14af7ee AV |
570 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
571 | ||
03e88ae1 | 572 | #ifdef CONFIG_MODULE_UNLOAD |
1da177e4 LT |
573 | /* Init the unload section of the module. */ |
574 | static void module_unload_init(struct module *mod) | |
575 | { | |
720eba31 | 576 | int cpu; |
1da177e4 LT |
577 | |
578 | INIT_LIST_HEAD(&mod->modules_which_use_me); | |
720eba31 ED |
579 | for_each_possible_cpu(cpu) |
580 | local_set(__module_ref_addr(mod, cpu), 0); | |
1da177e4 | 581 | /* Hold reference count during initialization. */ |
720eba31 | 582 | local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1); |
1da177e4 LT |
583 | /* Backwards compatibility macros put refcount during init. */ |
584 | mod->waiter = current; | |
585 | } | |
586 | ||
587 | /* modules using other modules */ | |
588 | struct module_use | |
589 | { | |
590 | struct list_head list; | |
591 | struct module *module_which_uses; | |
592 | }; | |
593 | ||
594 | /* Does a already use b? */ | |
595 | static int already_uses(struct module *a, struct module *b) | |
596 | { | |
597 | struct module_use *use; | |
598 | ||
599 | list_for_each_entry(use, &b->modules_which_use_me, list) { | |
600 | if (use->module_which_uses == a) { | |
601 | DEBUGP("%s uses %s!\n", a->name, b->name); | |
602 | return 1; | |
603 | } | |
604 | } | |
605 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
606 | return 0; | |
607 | } | |
608 | ||
609 | /* Module a uses b */ | |
610 | static int use_module(struct module *a, struct module *b) | |
611 | { | |
612 | struct module_use *use; | |
c9a3ba55 | 613 | int no_warn, err; |
270a6c4c | 614 | |
1da177e4 LT |
615 | if (b == NULL || already_uses(a, b)) return 1; |
616 | ||
c9a3ba55 RR |
617 | /* If we're interrupted or time out, we fail. */ |
618 | if (wait_event_interruptible_timeout( | |
619 | module_wq, (err = strong_try_module_get(b)) != -EBUSY, | |
620 | 30 * HZ) <= 0) { | |
621 | printk("%s: gave up waiting for init of module %s.\n", | |
622 | a->name, b->name); | |
623 | return 0; | |
624 | } | |
625 | ||
626 | /* If strong_try_module_get() returned a different error, we fail. */ | |
627 | if (err) | |
1da177e4 LT |
628 | return 0; |
629 | ||
630 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
631 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
632 | if (!use) { | |
633 | printk("%s: out of memory loading\n", a->name); | |
634 | module_put(b); | |
635 | return 0; | |
636 | } | |
637 | ||
638 | use->module_which_uses = a; | |
639 | list_add(&use->list, &b->modules_which_use_me); | |
270a6c4c | 640 | no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
1da177e4 LT |
641 | return 1; |
642 | } | |
643 | ||
644 | /* Clear the unload stuff of the module. */ | |
645 | static void module_unload_free(struct module *mod) | |
646 | { | |
647 | struct module *i; | |
648 | ||
649 | list_for_each_entry(i, &modules, list) { | |
650 | struct module_use *use; | |
651 | ||
652 | list_for_each_entry(use, &i->modules_which_use_me, list) { | |
653 | if (use->module_which_uses == mod) { | |
654 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
655 | module_put(i); | |
656 | list_del(&use->list); | |
657 | kfree(use); | |
270a6c4c | 658 | sysfs_remove_link(i->holders_dir, mod->name); |
1da177e4 LT |
659 | /* There can be at most one match. */ |
660 | break; | |
661 | } | |
662 | } | |
663 | } | |
664 | } | |
665 | ||
666 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 667 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
668 | { |
669 | int ret = (flags & O_TRUNC); | |
670 | if (ret) | |
fb169793 | 671 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
672 | return ret; |
673 | } | |
674 | #else | |
fb169793 | 675 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
676 | { |
677 | return 0; | |
678 | } | |
679 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
680 | ||
681 | struct stopref | |
682 | { | |
683 | struct module *mod; | |
684 | int flags; | |
685 | int *forced; | |
686 | }; | |
687 | ||
688 | /* Whole machine is stopped with interrupts off when this runs. */ | |
689 | static int __try_stop_module(void *_sref) | |
690 | { | |
691 | struct stopref *sref = _sref; | |
692 | ||
da39ba5e RR |
693 | /* If it's not unused, quit unless we're forcing. */ |
694 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 695 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
696 | return -EWOULDBLOCK; |
697 | } | |
698 | ||
699 | /* Mark it as dying. */ | |
700 | sref->mod->state = MODULE_STATE_GOING; | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
705 | { | |
da39ba5e RR |
706 | if (flags & O_NONBLOCK) { |
707 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 708 | |
9b1a4d38 | 709 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
710 | } else { |
711 | /* We don't need to stop the machine for this. */ | |
712 | mod->state = MODULE_STATE_GOING; | |
713 | synchronize_sched(); | |
714 | return 0; | |
715 | } | |
1da177e4 LT |
716 | } |
717 | ||
718 | unsigned int module_refcount(struct module *mod) | |
719 | { | |
720eba31 ED |
720 | unsigned int total = 0; |
721 | int cpu; | |
1da177e4 | 722 | |
720eba31 ED |
723 | for_each_possible_cpu(cpu) |
724 | total += local_read(__module_ref_addr(mod, cpu)); | |
1da177e4 LT |
725 | return total; |
726 | } | |
727 | EXPORT_SYMBOL(module_refcount); | |
728 | ||
729 | /* This exists whether we can unload or not */ | |
730 | static void free_module(struct module *mod); | |
731 | ||
732 | static void wait_for_zero_refcount(struct module *mod) | |
733 | { | |
a6550207 | 734 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 735 | mutex_unlock(&module_mutex); |
1da177e4 LT |
736 | for (;;) { |
737 | DEBUGP("Looking at refcount...\n"); | |
738 | set_current_state(TASK_UNINTERRUPTIBLE); | |
739 | if (module_refcount(mod) == 0) | |
740 | break; | |
741 | schedule(); | |
742 | } | |
743 | current->state = TASK_RUNNING; | |
6389a385 | 744 | mutex_lock(&module_mutex); |
1da177e4 LT |
745 | } |
746 | ||
17da2bd9 HC |
747 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
748 | unsigned int, flags) | |
1da177e4 LT |
749 | { |
750 | struct module *mod; | |
dfff0a06 | 751 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
752 | int ret, forced = 0; |
753 | ||
dfff0a06 GKH |
754 | if (!capable(CAP_SYS_MODULE)) |
755 | return -EPERM; | |
756 | ||
757 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
758 | return -EFAULT; | |
759 | name[MODULE_NAME_LEN-1] = '\0'; | |
760 | ||
9e01892c HC |
761 | /* Create stop_machine threads since free_module relies on |
762 | * a non-failing stop_machine call. */ | |
763 | ret = stop_machine_create(); | |
764 | if (ret) | |
765 | return ret; | |
766 | ||
767 | if (mutex_lock_interruptible(&module_mutex) != 0) { | |
768 | ret = -EINTR; | |
769 | goto out_stop; | |
770 | } | |
1da177e4 LT |
771 | |
772 | mod = find_module(name); | |
773 | if (!mod) { | |
774 | ret = -ENOENT; | |
775 | goto out; | |
776 | } | |
777 | ||
778 | if (!list_empty(&mod->modules_which_use_me)) { | |
779 | /* Other modules depend on us: get rid of them first. */ | |
780 | ret = -EWOULDBLOCK; | |
781 | goto out; | |
782 | } | |
783 | ||
784 | /* Doing init or already dying? */ | |
785 | if (mod->state != MODULE_STATE_LIVE) { | |
786 | /* FIXME: if (force), slam module count and wake up | |
787 | waiter --RR */ | |
788 | DEBUGP("%s already dying\n", mod->name); | |
789 | ret = -EBUSY; | |
790 | goto out; | |
791 | } | |
792 | ||
793 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 794 | if (mod->init && !mod->exit) { |
fb169793 | 795 | forced = try_force_unload(flags); |
1da177e4 LT |
796 | if (!forced) { |
797 | /* This module can't be removed */ | |
798 | ret = -EBUSY; | |
799 | goto out; | |
800 | } | |
801 | } | |
802 | ||
803 | /* Set this up before setting mod->state */ | |
804 | mod->waiter = current; | |
805 | ||
806 | /* Stop the machine so refcounts can't move and disable module. */ | |
807 | ret = try_stop_module(mod, flags, &forced); | |
808 | if (ret != 0) | |
809 | goto out; | |
810 | ||
811 | /* Never wait if forced. */ | |
812 | if (!forced && module_refcount(mod) != 0) | |
813 | wait_for_zero_refcount(mod); | |
814 | ||
df4b565e | 815 | mutex_unlock(&module_mutex); |
1da177e4 | 816 | /* Final destruction now noone is using it. */ |
df4b565e | 817 | if (mod->exit != NULL) |
1da177e4 | 818 | mod->exit(); |
df4b565e PO |
819 | blocking_notifier_call_chain(&module_notify_list, |
820 | MODULE_STATE_GOING, mod); | |
22a9d645 | 821 | async_synchronize_full(); |
df4b565e | 822 | mutex_lock(&module_mutex); |
e14af7ee | 823 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 824 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
346e15be | 825 | unregister_dynamic_debug_module(mod->name); |
1da177e4 LT |
826 | free_module(mod); |
827 | ||
828 | out: | |
6389a385 | 829 | mutex_unlock(&module_mutex); |
9e01892c HC |
830 | out_stop: |
831 | stop_machine_destroy(); | |
1da177e4 LT |
832 | return ret; |
833 | } | |
834 | ||
d1e99d7a | 835 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
836 | { |
837 | struct module_use *use; | |
838 | int printed_something = 0; | |
839 | ||
840 | seq_printf(m, " %u ", module_refcount(mod)); | |
841 | ||
842 | /* Always include a trailing , so userspace can differentiate | |
843 | between this and the old multi-field proc format. */ | |
844 | list_for_each_entry(use, &mod->modules_which_use_me, list) { | |
845 | printed_something = 1; | |
846 | seq_printf(m, "%s,", use->module_which_uses->name); | |
847 | } | |
848 | ||
1da177e4 LT |
849 | if (mod->init != NULL && mod->exit == NULL) { |
850 | printed_something = 1; | |
851 | seq_printf(m, "[permanent],"); | |
852 | } | |
853 | ||
854 | if (!printed_something) | |
855 | seq_printf(m, "-"); | |
856 | } | |
857 | ||
858 | void __symbol_put(const char *symbol) | |
859 | { | |
860 | struct module *owner; | |
1da177e4 | 861 | |
24da1cbf | 862 | preempt_disable(); |
ad9546c9 | 863 | if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false))) |
1da177e4 LT |
864 | BUG(); |
865 | module_put(owner); | |
24da1cbf | 866 | preempt_enable(); |
1da177e4 LT |
867 | } |
868 | EXPORT_SYMBOL(__symbol_put); | |
869 | ||
870 | void symbol_put_addr(void *addr) | |
871 | { | |
5e376613 | 872 | struct module *modaddr; |
1da177e4 | 873 | |
5e376613 TP |
874 | if (core_kernel_text((unsigned long)addr)) |
875 | return; | |
1da177e4 | 876 | |
5e376613 TP |
877 | if (!(modaddr = module_text_address((unsigned long)addr))) |
878 | BUG(); | |
879 | module_put(modaddr); | |
1da177e4 LT |
880 | } |
881 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
882 | ||
883 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
884 | struct module *mod, char *buffer) | |
885 | { | |
256e2fdf | 886 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
887 | } |
888 | ||
889 | static struct module_attribute refcnt = { | |
7b595756 | 890 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
891 | .show = show_refcnt, |
892 | }; | |
893 | ||
f6a57033 AV |
894 | void module_put(struct module *module) |
895 | { | |
896 | if (module) { | |
897 | unsigned int cpu = get_cpu(); | |
720eba31 | 898 | local_dec(__module_ref_addr(module, cpu)); |
f6a57033 AV |
899 | /* Maybe they're waiting for us to drop reference? */ |
900 | if (unlikely(!module_is_live(module))) | |
901 | wake_up_process(module->waiter); | |
902 | put_cpu(); | |
903 | } | |
904 | } | |
905 | EXPORT_SYMBOL(module_put); | |
906 | ||
1da177e4 | 907 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 908 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
909 | { |
910 | /* We don't know the usage count, or what modules are using. */ | |
911 | seq_printf(m, " - -"); | |
912 | } | |
913 | ||
914 | static inline void module_unload_free(struct module *mod) | |
915 | { | |
916 | } | |
917 | ||
918 | static inline int use_module(struct module *a, struct module *b) | |
919 | { | |
c9a3ba55 | 920 | return strong_try_module_get(b) == 0; |
1da177e4 LT |
921 | } |
922 | ||
923 | static inline void module_unload_init(struct module *mod) | |
924 | { | |
925 | } | |
926 | #endif /* CONFIG_MODULE_UNLOAD */ | |
927 | ||
1f71740a KS |
928 | static ssize_t show_initstate(struct module_attribute *mattr, |
929 | struct module *mod, char *buffer) | |
930 | { | |
931 | const char *state = "unknown"; | |
932 | ||
933 | switch (mod->state) { | |
934 | case MODULE_STATE_LIVE: | |
935 | state = "live"; | |
936 | break; | |
937 | case MODULE_STATE_COMING: | |
938 | state = "coming"; | |
939 | break; | |
940 | case MODULE_STATE_GOING: | |
941 | state = "going"; | |
942 | break; | |
943 | } | |
944 | return sprintf(buffer, "%s\n", state); | |
945 | } | |
946 | ||
947 | static struct module_attribute initstate = { | |
7b595756 | 948 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
949 | .show = show_initstate, |
950 | }; | |
951 | ||
03e88ae1 GKH |
952 | static struct module_attribute *modinfo_attrs[] = { |
953 | &modinfo_version, | |
954 | &modinfo_srcversion, | |
1f71740a | 955 | &initstate, |
03e88ae1 GKH |
956 | #ifdef CONFIG_MODULE_UNLOAD |
957 | &refcnt, | |
958 | #endif | |
959 | NULL, | |
960 | }; | |
961 | ||
1da177e4 LT |
962 | static const char vermagic[] = VERMAGIC_STRING; |
963 | ||
826e4506 LT |
964 | static int try_to_force_load(struct module *mod, const char *symname) |
965 | { | |
966 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 967 | if (!test_taint(TAINT_FORCED_MODULE)) |
826e4506 LT |
968 | printk("%s: no version for \"%s\" found: kernel tainted.\n", |
969 | mod->name, symname); | |
970 | add_taint_module(mod, TAINT_FORCED_MODULE); | |
971 | return 0; | |
972 | #else | |
973 | return -ENOEXEC; | |
974 | #endif | |
975 | } | |
976 | ||
1da177e4 LT |
977 | #ifdef CONFIG_MODVERSIONS |
978 | static int check_version(Elf_Shdr *sechdrs, | |
979 | unsigned int versindex, | |
980 | const char *symname, | |
981 | struct module *mod, | |
982 | const unsigned long *crc) | |
983 | { | |
984 | unsigned int i, num_versions; | |
985 | struct modversion_info *versions; | |
986 | ||
987 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
988 | if (!crc) | |
989 | return 1; | |
990 | ||
a5dd6970 RR |
991 | /* No versions at all? modprobe --force does this. */ |
992 | if (versindex == 0) | |
993 | return try_to_force_load(mod, symname) == 0; | |
994 | ||
1da177e4 LT |
995 | versions = (void *) sechdrs[versindex].sh_addr; |
996 | num_versions = sechdrs[versindex].sh_size | |
997 | / sizeof(struct modversion_info); | |
998 | ||
999 | for (i = 0; i < num_versions; i++) { | |
1000 | if (strcmp(versions[i].name, symname) != 0) | |
1001 | continue; | |
1002 | ||
1003 | if (versions[i].crc == *crc) | |
1004 | return 1; | |
1da177e4 LT |
1005 | DEBUGP("Found checksum %lX vs module %lX\n", |
1006 | *crc, versions[i].crc); | |
826e4506 | 1007 | goto bad_version; |
1da177e4 | 1008 | } |
826e4506 | 1009 | |
a5dd6970 RR |
1010 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1011 | mod->name, symname); | |
1012 | return 0; | |
826e4506 LT |
1013 | |
1014 | bad_version: | |
1015 | printk("%s: disagrees about version of symbol %s\n", | |
1016 | mod->name, symname); | |
1017 | return 0; | |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1021 | unsigned int versindex, | |
1022 | struct module *mod) | |
1023 | { | |
1024 | const unsigned long *crc; | |
1da177e4 | 1025 | |
ad9546c9 | 1026 | if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false))) |
1da177e4 | 1027 | BUG(); |
ad9546c9 | 1028 | return check_version(sechdrs, versindex, "struct_module", mod, crc); |
1da177e4 LT |
1029 | } |
1030 | ||
91e37a79 RR |
1031 | /* First part is kernel version, which we ignore if module has crcs. */ |
1032 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1033 | bool has_crcs) | |
1da177e4 | 1034 | { |
91e37a79 RR |
1035 | if (has_crcs) { |
1036 | amagic += strcspn(amagic, " "); | |
1037 | bmagic += strcspn(bmagic, " "); | |
1038 | } | |
1da177e4 LT |
1039 | return strcmp(amagic, bmagic) == 0; |
1040 | } | |
1041 | #else | |
1042 | static inline int check_version(Elf_Shdr *sechdrs, | |
1043 | unsigned int versindex, | |
1044 | const char *symname, | |
1045 | struct module *mod, | |
1046 | const unsigned long *crc) | |
1047 | { | |
1048 | return 1; | |
1049 | } | |
1050 | ||
1051 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1052 | unsigned int versindex, | |
1053 | struct module *mod) | |
1054 | { | |
1055 | return 1; | |
1056 | } | |
1057 | ||
91e37a79 RR |
1058 | static inline int same_magic(const char *amagic, const char *bmagic, |
1059 | bool has_crcs) | |
1da177e4 LT |
1060 | { |
1061 | return strcmp(amagic, bmagic) == 0; | |
1062 | } | |
1063 | #endif /* CONFIG_MODVERSIONS */ | |
1064 | ||
1065 | /* Resolve a symbol for this module. I.e. if we find one, record usage. | |
1066 | Must be holding module_mutex. */ | |
1067 | static unsigned long resolve_symbol(Elf_Shdr *sechdrs, | |
1068 | unsigned int versindex, | |
1069 | const char *name, | |
1070 | struct module *mod) | |
1071 | { | |
1072 | struct module *owner; | |
1073 | unsigned long ret; | |
1074 | const unsigned long *crc; | |
1075 | ||
ad9546c9 | 1076 | ret = find_symbol(name, &owner, &crc, |
25ddbb18 | 1077 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
88173507 | 1078 | if (!IS_ERR_VALUE(ret)) { |
9a4b9708 ML |
1079 | /* use_module can fail due to OOM, |
1080 | or module initialization or unloading */ | |
1da177e4 LT |
1081 | if (!check_version(sechdrs, versindex, name, mod, crc) || |
1082 | !use_module(mod, owner)) | |
88173507 | 1083 | ret = -EINVAL; |
1da177e4 | 1084 | } |
1da177e4 LT |
1085 | return ret; |
1086 | } | |
1087 | ||
1da177e4 LT |
1088 | /* |
1089 | * /sys/module/foo/sections stuff | |
1090 | * J. Corbet <corbet@lwn.net> | |
1091 | */ | |
120fc3d7 | 1092 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
a58730c4 RR |
1093 | struct module_sect_attr |
1094 | { | |
1095 | struct module_attribute mattr; | |
1096 | char *name; | |
1097 | unsigned long address; | |
1098 | }; | |
1099 | ||
1100 | struct module_sect_attrs | |
1101 | { | |
1102 | struct attribute_group grp; | |
1103 | unsigned int nsections; | |
1104 | struct module_sect_attr attrs[0]; | |
1105 | }; | |
1106 | ||
1da177e4 LT |
1107 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1108 | struct module *mod, char *buf) | |
1109 | { | |
1110 | struct module_sect_attr *sattr = | |
1111 | container_of(mattr, struct module_sect_attr, mattr); | |
1112 | return sprintf(buf, "0x%lx\n", sattr->address); | |
1113 | } | |
1114 | ||
04b1db9f IN |
1115 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1116 | { | |
a58730c4 | 1117 | unsigned int section; |
04b1db9f IN |
1118 | |
1119 | for (section = 0; section < sect_attrs->nsections; section++) | |
1120 | kfree(sect_attrs->attrs[section].name); | |
1121 | kfree(sect_attrs); | |
1122 | } | |
1123 | ||
1da177e4 LT |
1124 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1125 | char *secstrings, Elf_Shdr *sechdrs) | |
1126 | { | |
1127 | unsigned int nloaded = 0, i, size[2]; | |
1128 | struct module_sect_attrs *sect_attrs; | |
1129 | struct module_sect_attr *sattr; | |
1130 | struct attribute **gattr; | |
22a8bdeb | 1131 | |
1da177e4 LT |
1132 | /* Count loaded sections and allocate structures */ |
1133 | for (i = 0; i < nsect; i++) | |
1134 | if (sechdrs[i].sh_flags & SHF_ALLOC) | |
1135 | nloaded++; | |
1136 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1137 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1138 | sizeof(sect_attrs->grp.attrs[0])); | |
1139 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1140 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1141 | if (sect_attrs == NULL) | |
1da177e4 LT |
1142 | return; |
1143 | ||
1144 | /* Setup section attributes. */ | |
1145 | sect_attrs->grp.name = "sections"; | |
1146 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1147 | ||
04b1db9f | 1148 | sect_attrs->nsections = 0; |
1da177e4 LT |
1149 | sattr = §_attrs->attrs[0]; |
1150 | gattr = §_attrs->grp.attrs[0]; | |
1151 | for (i = 0; i < nsect; i++) { | |
1152 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) | |
1153 | continue; | |
1154 | sattr->address = sechdrs[i].sh_addr; | |
04b1db9f IN |
1155 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1156 | GFP_KERNEL); | |
1157 | if (sattr->name == NULL) | |
1158 | goto out; | |
1159 | sect_attrs->nsections++; | |
1da177e4 LT |
1160 | sattr->mattr.show = module_sect_show; |
1161 | sattr->mattr.store = NULL; | |
1162 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1163 | sattr->mattr.attr.mode = S_IRUGO; |
1164 | *(gattr++) = &(sattr++)->mattr.attr; | |
1165 | } | |
1166 | *gattr = NULL; | |
1167 | ||
1168 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1169 | goto out; | |
1170 | ||
1171 | mod->sect_attrs = sect_attrs; | |
1172 | return; | |
1173 | out: | |
04b1db9f | 1174 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1175 | } |
1176 | ||
1177 | static void remove_sect_attrs(struct module *mod) | |
1178 | { | |
1179 | if (mod->sect_attrs) { | |
1180 | sysfs_remove_group(&mod->mkobj.kobj, | |
1181 | &mod->sect_attrs->grp); | |
1182 | /* We are positive that no one is using any sect attrs | |
1183 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1184 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1185 | mod->sect_attrs = NULL; |
1186 | } | |
1187 | } | |
1188 | ||
6d760133 RM |
1189 | /* |
1190 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1191 | */ | |
1192 | ||
1193 | struct module_notes_attrs { | |
1194 | struct kobject *dir; | |
1195 | unsigned int notes; | |
1196 | struct bin_attribute attrs[0]; | |
1197 | }; | |
1198 | ||
1199 | static ssize_t module_notes_read(struct kobject *kobj, | |
1200 | struct bin_attribute *bin_attr, | |
1201 | char *buf, loff_t pos, size_t count) | |
1202 | { | |
1203 | /* | |
1204 | * The caller checked the pos and count against our size. | |
1205 | */ | |
1206 | memcpy(buf, bin_attr->private + pos, count); | |
1207 | return count; | |
1208 | } | |
1209 | ||
1210 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1211 | unsigned int i) | |
1212 | { | |
1213 | if (notes_attrs->dir) { | |
1214 | while (i-- > 0) | |
1215 | sysfs_remove_bin_file(notes_attrs->dir, | |
1216 | ¬es_attrs->attrs[i]); | |
e9432093 | 1217 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1218 | } |
1219 | kfree(notes_attrs); | |
1220 | } | |
1221 | ||
1222 | static void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1223 | char *secstrings, Elf_Shdr *sechdrs) | |
1224 | { | |
1225 | unsigned int notes, loaded, i; | |
1226 | struct module_notes_attrs *notes_attrs; | |
1227 | struct bin_attribute *nattr; | |
1228 | ||
1229 | /* Count notes sections and allocate structures. */ | |
1230 | notes = 0; | |
1231 | for (i = 0; i < nsect; i++) | |
1232 | if ((sechdrs[i].sh_flags & SHF_ALLOC) && | |
1233 | (sechdrs[i].sh_type == SHT_NOTE)) | |
1234 | ++notes; | |
1235 | ||
1236 | if (notes == 0) | |
1237 | return; | |
1238 | ||
1239 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1240 | + notes * sizeof(notes_attrs->attrs[0]), | |
1241 | GFP_KERNEL); | |
1242 | if (notes_attrs == NULL) | |
1243 | return; | |
1244 | ||
1245 | notes_attrs->notes = notes; | |
1246 | nattr = ¬es_attrs->attrs[0]; | |
1247 | for (loaded = i = 0; i < nsect; ++i) { | |
1248 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1249 | continue; | |
1250 | if (sechdrs[i].sh_type == SHT_NOTE) { | |
1251 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; | |
1252 | nattr->attr.mode = S_IRUGO; | |
1253 | nattr->size = sechdrs[i].sh_size; | |
1254 | nattr->private = (void *) sechdrs[i].sh_addr; | |
1255 | nattr->read = module_notes_read; | |
1256 | ++nattr; | |
1257 | } | |
1258 | ++loaded; | |
1259 | } | |
1260 | ||
4ff6abff | 1261 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1262 | if (!notes_attrs->dir) |
1263 | goto out; | |
1264 | ||
1265 | for (i = 0; i < notes; ++i) | |
1266 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1267 | ¬es_attrs->attrs[i])) | |
1268 | goto out; | |
1269 | ||
1270 | mod->notes_attrs = notes_attrs; | |
1271 | return; | |
1272 | ||
1273 | out: | |
1274 | free_notes_attrs(notes_attrs, i); | |
1275 | } | |
1276 | ||
1277 | static void remove_notes_attrs(struct module *mod) | |
1278 | { | |
1279 | if (mod->notes_attrs) | |
1280 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1281 | } | |
1282 | ||
1da177e4 | 1283 | #else |
04b1db9f | 1284 | |
1da177e4 LT |
1285 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1286 | char *sectstrings, Elf_Shdr *sechdrs) | |
1287 | { | |
1288 | } | |
1289 | ||
1290 | static inline void remove_sect_attrs(struct module *mod) | |
1291 | { | |
1292 | } | |
6d760133 RM |
1293 | |
1294 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1295 | char *sectstrings, Elf_Shdr *sechdrs) | |
1296 | { | |
1297 | } | |
1298 | ||
1299 | static inline void remove_notes_attrs(struct module *mod) | |
1300 | { | |
1301 | } | |
120fc3d7 | 1302 | #endif |
1da177e4 | 1303 | |
ef665c1a RD |
1304 | #ifdef CONFIG_SYSFS |
1305 | int module_add_modinfo_attrs(struct module *mod) | |
c988d2b2 MD |
1306 | { |
1307 | struct module_attribute *attr; | |
03e88ae1 | 1308 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1309 | int error = 0; |
1310 | int i; | |
1311 | ||
03e88ae1 GKH |
1312 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1313 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1314 | GFP_KERNEL); | |
1315 | if (!mod->modinfo_attrs) | |
1316 | return -ENOMEM; | |
1317 | ||
1318 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1319 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1320 | if (!attr->test || | |
03e88ae1 GKH |
1321 | (attr->test && attr->test(mod))) { |
1322 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
03e88ae1 GKH |
1323 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1324 | ++temp_attr; | |
1325 | } | |
c988d2b2 MD |
1326 | } |
1327 | return error; | |
1328 | } | |
1329 | ||
ef665c1a | 1330 | void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1331 | { |
1332 | struct module_attribute *attr; | |
1333 | int i; | |
1334 | ||
03e88ae1 GKH |
1335 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1336 | /* pick a field to test for end of list */ | |
1337 | if (!attr->attr.name) | |
1338 | break; | |
c988d2b2 | 1339 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1340 | if (attr->free) |
1341 | attr->free(mod); | |
c988d2b2 | 1342 | } |
03e88ae1 | 1343 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1344 | } |
1da177e4 | 1345 | |
ef665c1a | 1346 | int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1347 | { |
1348 | int err; | |
6494a93d | 1349 | struct kobject *kobj; |
1da177e4 | 1350 | |
823bccfc GKH |
1351 | if (!module_sysfs_initialized) { |
1352 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1353 | mod->name); |
1354 | err = -EINVAL; | |
1355 | goto out; | |
1356 | } | |
6494a93d GKH |
1357 | |
1358 | kobj = kset_find_obj(module_kset, mod->name); | |
1359 | if (kobj) { | |
1360 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1361 | kobject_put(kobj); | |
1362 | err = -EINVAL; | |
1363 | goto out; | |
1364 | } | |
1365 | ||
1da177e4 | 1366 | mod->mkobj.mod = mod; |
e17e0f51 | 1367 | |
ac3c8141 GKH |
1368 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1369 | mod->mkobj.kobj.kset = module_kset; | |
1370 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1371 | "%s", mod->name); | |
1372 | if (err) | |
1373 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1374 | |
97c146ef | 1375 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1376 | out: |
1377 | return err; | |
1378 | } | |
1379 | ||
ef665c1a | 1380 | int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1381 | struct kernel_param *kparam, |
1382 | unsigned int num_params) | |
1383 | { | |
1384 | int err; | |
1385 | ||
4ff6abff | 1386 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1387 | if (!mod->holders_dir) { |
1388 | err = -ENOMEM; | |
270a6c4c | 1389 | goto out_unreg; |
240936e1 | 1390 | } |
270a6c4c | 1391 | |
1da177e4 LT |
1392 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1393 | if (err) | |
270a6c4c | 1394 | goto out_unreg_holders; |
1da177e4 | 1395 | |
c988d2b2 MD |
1396 | err = module_add_modinfo_attrs(mod); |
1397 | if (err) | |
e17e0f51 | 1398 | goto out_unreg_param; |
c988d2b2 | 1399 | |
e17e0f51 | 1400 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1401 | return 0; |
1402 | ||
e17e0f51 KS |
1403 | out_unreg_param: |
1404 | module_param_sysfs_remove(mod); | |
270a6c4c | 1405 | out_unreg_holders: |
78a2d906 | 1406 | kobject_put(mod->holders_dir); |
270a6c4c | 1407 | out_unreg: |
e17e0f51 | 1408 | kobject_put(&mod->mkobj.kobj); |
1da177e4 LT |
1409 | return err; |
1410 | } | |
34e4e2fe DL |
1411 | |
1412 | static void mod_sysfs_fini(struct module *mod) | |
1413 | { | |
1414 | kobject_put(&mod->mkobj.kobj); | |
1415 | } | |
1416 | ||
1417 | #else /* CONFIG_SYSFS */ | |
1418 | ||
1419 | static void mod_sysfs_fini(struct module *mod) | |
1420 | { | |
1421 | } | |
1422 | ||
1423 | #endif /* CONFIG_SYSFS */ | |
1da177e4 LT |
1424 | |
1425 | static void mod_kobject_remove(struct module *mod) | |
1426 | { | |
c988d2b2 | 1427 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1428 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1429 | kobject_put(mod->mkobj.drivers_dir); |
1430 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1431 | mod_sysfs_fini(mod); |
1da177e4 LT |
1432 | } |
1433 | ||
1434 | /* | |
1435 | * unlink the module with the whole machine is stopped with interrupts off | |
1436 | * - this defends against kallsyms not taking locks | |
1437 | */ | |
1438 | static int __unlink_module(void *_mod) | |
1439 | { | |
1440 | struct module *mod = _mod; | |
1441 | list_del(&mod->list); | |
1442 | return 0; | |
1443 | } | |
1444 | ||
02a3e59a | 1445 | /* Free a module, remove from lists, etc (must hold module_mutex). */ |
1da177e4 LT |
1446 | static void free_module(struct module *mod) |
1447 | { | |
1448 | /* Delete from various lists */ | |
9b1a4d38 | 1449 | stop_machine(__unlink_module, mod, NULL); |
6d760133 | 1450 | remove_notes_attrs(mod); |
1da177e4 LT |
1451 | remove_sect_attrs(mod); |
1452 | mod_kobject_remove(mod); | |
1453 | ||
1454 | /* Arch-specific cleanup. */ | |
1455 | module_arch_cleanup(mod); | |
1456 | ||
1457 | /* Module unload stuff */ | |
1458 | module_unload_free(mod); | |
1459 | ||
fed1939c SR |
1460 | /* release any pointers to mcount in this module */ |
1461 | ftrace_release(mod->module_core, mod->core_size); | |
1462 | ||
1da177e4 LT |
1463 | /* This may be NULL, but that's OK */ |
1464 | module_free(mod, mod->module_init); | |
1465 | kfree(mod->args); | |
1466 | if (mod->percpu) | |
1467 | percpu_modfree(mod->percpu); | |
720eba31 ED |
1468 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
1469 | if (mod->refptr) | |
1470 | percpu_modfree(mod->refptr); | |
1471 | #endif | |
fbb9ce95 IM |
1472 | /* Free lock-classes: */ |
1473 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1474 | ||
1da177e4 LT |
1475 | /* Finally, free the core (containing the module structure) */ |
1476 | module_free(mod, mod->module_core); | |
1477 | } | |
1478 | ||
1479 | void *__symbol_get(const char *symbol) | |
1480 | { | |
1481 | struct module *owner; | |
24da1cbf | 1482 | unsigned long value; |
1da177e4 | 1483 | |
24da1cbf | 1484 | preempt_disable(); |
ad9546c9 | 1485 | value = find_symbol(symbol, &owner, NULL, true, true); |
88173507 CL |
1486 | if (IS_ERR_VALUE(value)) |
1487 | value = 0; | |
1488 | else if (strong_try_module_get(owner)) | |
1da177e4 | 1489 | value = 0; |
24da1cbf | 1490 | preempt_enable(); |
1da177e4 LT |
1491 | |
1492 | return (void *)value; | |
1493 | } | |
1494 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1495 | ||
eea8b54d AN |
1496 | /* |
1497 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1498 | * in the kernel or in some other module's exported symbol table. |
eea8b54d AN |
1499 | */ |
1500 | static int verify_export_symbols(struct module *mod) | |
1501 | { | |
b211104d | 1502 | unsigned int i; |
eea8b54d | 1503 | struct module *owner; |
b211104d RR |
1504 | const struct kernel_symbol *s; |
1505 | struct { | |
1506 | const struct kernel_symbol *sym; | |
1507 | unsigned int num; | |
1508 | } arr[] = { | |
1509 | { mod->syms, mod->num_syms }, | |
1510 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1511 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1512 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1513 | { mod->unused_syms, mod->num_unused_syms }, |
1514 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1515 | #endif |
b211104d | 1516 | }; |
eea8b54d | 1517 | |
b211104d RR |
1518 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1519 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
1520 | if (!IS_ERR_VALUE(find_symbol(s->name, &owner, | |
1521 | NULL, true, false))) { | |
1522 | printk(KERN_ERR | |
1523 | "%s: exports duplicate symbol %s" | |
1524 | " (owned by %s)\n", | |
1525 | mod->name, s->name, module_name(owner)); | |
1526 | return -ENOEXEC; | |
1527 | } | |
eea8b54d | 1528 | } |
b211104d RR |
1529 | } |
1530 | return 0; | |
eea8b54d AN |
1531 | } |
1532 | ||
9a4b9708 | 1533 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4 LT |
1534 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1535 | unsigned int symindex, | |
1536 | const char *strtab, | |
1537 | unsigned int versindex, | |
1538 | unsigned int pcpuindex, | |
1539 | struct module *mod) | |
1540 | { | |
1541 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1542 | unsigned long secbase; | |
1543 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1544 | int ret = 0; | |
1545 | ||
1546 | for (i = 1; i < n; i++) { | |
1547 | switch (sym[i].st_shndx) { | |
1548 | case SHN_COMMON: | |
1549 | /* We compiled with -fno-common. These are not | |
1550 | supposed to happen. */ | |
1551 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1552 | printk("%s: please compile with -fno-common\n", | |
1553 | mod->name); | |
1554 | ret = -ENOEXEC; | |
1555 | break; | |
1556 | ||
1557 | case SHN_ABS: | |
1558 | /* Don't need to do anything */ | |
1559 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1560 | (long)sym[i].st_value); | |
1561 | break; | |
1562 | ||
1563 | case SHN_UNDEF: | |
1564 | sym[i].st_value | |
1565 | = resolve_symbol(sechdrs, versindex, | |
1566 | strtab + sym[i].st_name, mod); | |
1567 | ||
1568 | /* Ok if resolved. */ | |
88173507 | 1569 | if (!IS_ERR_VALUE(sym[i].st_value)) |
1da177e4 LT |
1570 | break; |
1571 | /* Ok if weak. */ | |
1572 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) | |
1573 | break; | |
1574 | ||
1575 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
1576 | mod->name, strtab + sym[i].st_name); | |
1577 | ret = -ENOENT; | |
1578 | break; | |
1579 | ||
1580 | default: | |
1581 | /* Divert to percpu allocation if a percpu var. */ | |
1582 | if (sym[i].st_shndx == pcpuindex) | |
1583 | secbase = (unsigned long)mod->percpu; | |
1584 | else | |
1585 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1586 | sym[i].st_value += secbase; | |
1587 | break; | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | return ret; | |
1592 | } | |
1593 | ||
088af9a6 HD |
1594 | /* Additional bytes needed by arch in front of individual sections */ |
1595 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1596 | unsigned int section) | |
1597 | { | |
1598 | /* default implementation just returns zero */ | |
1599 | return 0; | |
1600 | } | |
1601 | ||
1da177e4 | 1602 | /* Update size with this section: return offset. */ |
088af9a6 HD |
1603 | static long get_offset(struct module *mod, unsigned int *size, |
1604 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
1605 | { |
1606 | long ret; | |
1607 | ||
088af9a6 | 1608 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1609 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1610 | *size = ret + sechdr->sh_size; | |
1611 | return ret; | |
1612 | } | |
1613 | ||
1614 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1615 | might -- code, read-only data, read-write data, small data. Tally | |
1616 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1617 | belongs in init. */ | |
1618 | static void layout_sections(struct module *mod, | |
1619 | const Elf_Ehdr *hdr, | |
1620 | Elf_Shdr *sechdrs, | |
1621 | const char *secstrings) | |
1622 | { | |
1623 | static unsigned long const masks[][2] = { | |
1624 | /* NOTE: all executable code must be the first section | |
1625 | * in this array; otherwise modify the text_size | |
1626 | * finder in the two loops below */ | |
1627 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1628 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1629 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1630 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1631 | }; | |
1632 | unsigned int m, i; | |
1633 | ||
1634 | for (i = 0; i < hdr->e_shnum; i++) | |
1635 | sechdrs[i].sh_entsize = ~0UL; | |
1636 | ||
1637 | DEBUGP("Core section allocation order:\n"); | |
1638 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1639 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1640 | Elf_Shdr *s = &sechdrs[i]; | |
1641 | ||
1642 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1643 | || (s->sh_flags & masks[m][1]) | |
1644 | || s->sh_entsize != ~0UL | |
1645 | || strncmp(secstrings + s->sh_name, | |
1646 | ".init", 5) == 0) | |
1647 | continue; | |
088af9a6 | 1648 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
1da177e4 LT |
1649 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
1650 | } | |
1651 | if (m == 0) | |
1652 | mod->core_text_size = mod->core_size; | |
1653 | } | |
1654 | ||
1655 | DEBUGP("Init section allocation order:\n"); | |
1656 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1657 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1658 | Elf_Shdr *s = &sechdrs[i]; | |
1659 | ||
1660 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1661 | || (s->sh_flags & masks[m][1]) | |
1662 | || s->sh_entsize != ~0UL | |
1663 | || strncmp(secstrings + s->sh_name, | |
1664 | ".init", 5) != 0) | |
1665 | continue; | |
088af9a6 | 1666 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 LT |
1667 | | INIT_OFFSET_MASK); |
1668 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1669 | } | |
1670 | if (m == 0) | |
1671 | mod->init_text_size = mod->init_size; | |
1672 | } | |
1673 | } | |
1674 | ||
1da177e4 LT |
1675 | static void set_license(struct module *mod, const char *license) |
1676 | { | |
1677 | if (!license) | |
1678 | license = "unspecified"; | |
1679 | ||
fa3ba2e8 | 1680 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1681 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 1682 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1683 | "kernel.\n", mod->name, license); |
1684 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1685 | } |
1686 | } | |
1687 | ||
1688 | /* Parse tag=value strings from .modinfo section */ | |
1689 | static char *next_string(char *string, unsigned long *secsize) | |
1690 | { | |
1691 | /* Skip non-zero chars */ | |
1692 | while (string[0]) { | |
1693 | string++; | |
1694 | if ((*secsize)-- <= 1) | |
1695 | return NULL; | |
1696 | } | |
1697 | ||
1698 | /* Skip any zero padding. */ | |
1699 | while (!string[0]) { | |
1700 | string++; | |
1701 | if ((*secsize)-- <= 1) | |
1702 | return NULL; | |
1703 | } | |
1704 | return string; | |
1705 | } | |
1706 | ||
1707 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1708 | unsigned int info, | |
1709 | const char *tag) | |
1710 | { | |
1711 | char *p; | |
1712 | unsigned int taglen = strlen(tag); | |
1713 | unsigned long size = sechdrs[info].sh_size; | |
1714 | ||
1715 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1716 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1717 | return p + taglen + 1; | |
1718 | } | |
1719 | return NULL; | |
1720 | } | |
1721 | ||
c988d2b2 MD |
1722 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1723 | unsigned int infoindex) | |
1724 | { | |
1725 | struct module_attribute *attr; | |
1726 | int i; | |
1727 | ||
1728 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1729 | if (attr->setup) | |
1730 | attr->setup(mod, | |
1731 | get_modinfo(sechdrs, | |
1732 | infoindex, | |
1733 | attr->attr.name)); | |
1734 | } | |
1735 | } | |
c988d2b2 | 1736 | |
1da177e4 | 1737 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
1738 | |
1739 | /* lookup symbol in given range of kernel_symbols */ | |
1740 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
1741 | const struct kernel_symbol *start, | |
1742 | const struct kernel_symbol *stop) | |
1743 | { | |
1744 | const struct kernel_symbol *ks = start; | |
1745 | for (; ks < stop; ks++) | |
1746 | if (strcmp(ks->name, name) == 0) | |
1747 | return ks; | |
1748 | return NULL; | |
1749 | } | |
1750 | ||
ca4787b7 TA |
1751 | static int is_exported(const char *name, unsigned long value, |
1752 | const struct module *mod) | |
1da177e4 | 1753 | { |
ca4787b7 TA |
1754 | const struct kernel_symbol *ks; |
1755 | if (!mod) | |
1756 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 1757 | else |
ca4787b7 TA |
1758 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
1759 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
1760 | } |
1761 | ||
1762 | /* As per nm */ | |
1763 | static char elf_type(const Elf_Sym *sym, | |
1764 | Elf_Shdr *sechdrs, | |
1765 | const char *secstrings, | |
1766 | struct module *mod) | |
1767 | { | |
1768 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1769 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1770 | return 'v'; | |
1771 | else | |
1772 | return 'w'; | |
1773 | } | |
1774 | if (sym->st_shndx == SHN_UNDEF) | |
1775 | return 'U'; | |
1776 | if (sym->st_shndx == SHN_ABS) | |
1777 | return 'a'; | |
1778 | if (sym->st_shndx >= SHN_LORESERVE) | |
1779 | return '?'; | |
1780 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1781 | return 't'; | |
1782 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1783 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1784 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1785 | return 'r'; | |
1786 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1787 | return 'g'; | |
1788 | else | |
1789 | return 'd'; | |
1790 | } | |
1791 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1792 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1793 | return 's'; | |
1794 | else | |
1795 | return 'b'; | |
1796 | } | |
1797 | if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, | |
1798 | ".debug", strlen(".debug")) == 0) | |
1799 | return 'n'; | |
1800 | return '?'; | |
1801 | } | |
1802 | ||
1803 | static void add_kallsyms(struct module *mod, | |
1804 | Elf_Shdr *sechdrs, | |
1805 | unsigned int symindex, | |
1806 | unsigned int strindex, | |
1807 | const char *secstrings) | |
1808 | { | |
1809 | unsigned int i; | |
1810 | ||
1811 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
1812 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1813 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
1814 | ||
1815 | /* Set types up while we still have access to sections. */ | |
1816 | for (i = 0; i < mod->num_symtab; i++) | |
1817 | mod->symtab[i].st_info | |
1818 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
1819 | } | |
1820 | #else | |
1821 | static inline void add_kallsyms(struct module *mod, | |
1822 | Elf_Shdr *sechdrs, | |
1823 | unsigned int symindex, | |
1824 | unsigned int strindex, | |
1825 | const char *secstrings) | |
1826 | { | |
1827 | } | |
1828 | #endif /* CONFIG_KALLSYMS */ | |
1829 | ||
5e458cc0 | 1830 | static void dynamic_printk_setup(struct mod_debug *debug, unsigned int num) |
346e15be | 1831 | { |
5e458cc0 RR |
1832 | #ifdef CONFIG_DYNAMIC_PRINTK_DEBUG |
1833 | unsigned int i; | |
346e15be | 1834 | |
5e458cc0 RR |
1835 | for (i = 0; i < num; i++) { |
1836 | register_dynamic_debug_module(debug[i].modname, | |
1837 | debug[i].type, | |
1838 | debug[i].logical_modname, | |
1839 | debug[i].flag_names, | |
1840 | debug[i].hash, debug[i].hash2); | |
346e15be | 1841 | } |
346e15be | 1842 | #endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */ |
5e458cc0 | 1843 | } |
346e15be | 1844 | |
3a642e99 RR |
1845 | static void *module_alloc_update_bounds(unsigned long size) |
1846 | { | |
1847 | void *ret = module_alloc(size); | |
1848 | ||
1849 | if (ret) { | |
1850 | /* Update module bounds. */ | |
1851 | if ((unsigned long)ret < module_addr_min) | |
1852 | module_addr_min = (unsigned long)ret; | |
1853 | if ((unsigned long)ret + size > module_addr_max) | |
1854 | module_addr_max = (unsigned long)ret + size; | |
1855 | } | |
1856 | return ret; | |
1857 | } | |
1858 | ||
1da177e4 LT |
1859 | /* Allocate and load the module: note that size of section 0 is always |
1860 | zero, and we rely on this for optional sections. */ | |
ffb4ba76 | 1861 | static noinline struct module *load_module(void __user *umod, |
1da177e4 LT |
1862 | unsigned long len, |
1863 | const char __user *uargs) | |
1864 | { | |
1865 | Elf_Ehdr *hdr; | |
1866 | Elf_Shdr *sechdrs; | |
1867 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
061b1bd3 | 1868 | char *staging; |
84860f99 AM |
1869 | unsigned int i; |
1870 | unsigned int symindex = 0; | |
1871 | unsigned int strindex = 0; | |
5e458cc0 | 1872 | unsigned int modindex, versindex, infoindex, pcpuindex; |
5e458cc0 RR |
1873 | unsigned int num_kp, num_mcount; |
1874 | struct kernel_param *kp; | |
1da177e4 LT |
1875 | struct module *mod; |
1876 | long err = 0; | |
1877 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ | |
5e458cc0 | 1878 | unsigned long *mseg; |
378bac82 | 1879 | mm_segment_t old_fs; |
1da177e4 LT |
1880 | |
1881 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
1882 | umod, len, uargs); | |
1883 | if (len < sizeof(*hdr)) | |
1884 | return ERR_PTR(-ENOEXEC); | |
1885 | ||
1886 | /* Suck in entire file: we'll want most of it. */ | |
1887 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
1888 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
1889 | return ERR_PTR(-ENOMEM); | |
9e01892c HC |
1890 | |
1891 | /* Create stop_machine threads since the error path relies on | |
1892 | * a non-failing stop_machine call. */ | |
1893 | err = stop_machine_create(); | |
1894 | if (err) | |
1895 | goto free_hdr; | |
1896 | ||
1da177e4 LT |
1897 | if (copy_from_user(hdr, umod, len) != 0) { |
1898 | err = -EFAULT; | |
1899 | goto free_hdr; | |
1900 | } | |
1901 | ||
1902 | /* Sanity checks against insmoding binaries or wrong arch, | |
1903 | weird elf version */ | |
c4ea6fcf | 1904 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
1da177e4 LT |
1905 | || hdr->e_type != ET_REL |
1906 | || !elf_check_arch(hdr) | |
1907 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
1908 | err = -ENOEXEC; | |
1909 | goto free_hdr; | |
1910 | } | |
1911 | ||
1912 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
1913 | goto truncated; | |
1914 | ||
1915 | /* Convenience variables */ | |
1916 | sechdrs = (void *)hdr + hdr->e_shoff; | |
1917 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
1918 | sechdrs[0].sh_addr = 0; | |
1919 | ||
1920 | for (i = 1; i < hdr->e_shnum; i++) { | |
1921 | if (sechdrs[i].sh_type != SHT_NOBITS | |
1922 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
1923 | goto truncated; | |
1924 | ||
1925 | /* Mark all sections sh_addr with their address in the | |
1926 | temporary image. */ | |
1927 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
1928 | ||
1929 | /* Internal symbols and strings. */ | |
1930 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
1931 | symindex = i; | |
1932 | strindex = sechdrs[i].sh_link; | |
1933 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
1934 | } | |
1935 | #ifndef CONFIG_MODULE_UNLOAD | |
1936 | /* Don't load .exit sections */ | |
1937 | if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) | |
1938 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1939 | #endif | |
1940 | } | |
1941 | ||
1942 | modindex = find_sec(hdr, sechdrs, secstrings, | |
1943 | ".gnu.linkonce.this_module"); | |
1944 | if (!modindex) { | |
1945 | printk(KERN_WARNING "No module found in object\n"); | |
1946 | err = -ENOEXEC; | |
1947 | goto free_hdr; | |
1948 | } | |
5e458cc0 | 1949 | /* This is temporary: point mod into copy of data. */ |
1da177e4 LT |
1950 | mod = (void *)sechdrs[modindex].sh_addr; |
1951 | ||
1952 | if (symindex == 0) { | |
1953 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
1954 | mod->name); | |
1955 | err = -ENOEXEC; | |
1956 | goto free_hdr; | |
1957 | } | |
1958 | ||
1da177e4 LT |
1959 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); |
1960 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
1961 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
1962 | ||
ea01e798 | 1963 | /* Don't keep modinfo and version sections. */ |
1da177e4 | 1964 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
ea01e798 | 1965 | sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
1966 | #ifdef CONFIG_KALLSYMS |
1967 | /* Keep symbol and string tables for decoding later. */ | |
1968 | sechdrs[symindex].sh_flags |= SHF_ALLOC; | |
1969 | sechdrs[strindex].sh_flags |= SHF_ALLOC; | |
1970 | #endif | |
1971 | ||
1972 | /* Check module struct version now, before we try to use module. */ | |
1973 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
1974 | err = -ENOEXEC; | |
1975 | goto free_hdr; | |
1976 | } | |
1977 | ||
1978 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
1979 | /* This is allowed: modprobe --force will invalidate it. */ | |
1980 | if (!modmagic) { | |
826e4506 LT |
1981 | err = try_to_force_load(mod, "magic"); |
1982 | if (err) | |
1983 | goto free_hdr; | |
91e37a79 | 1984 | } else if (!same_magic(modmagic, vermagic, versindex)) { |
1da177e4 LT |
1985 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
1986 | mod->name, modmagic, vermagic); | |
1987 | err = -ENOEXEC; | |
1988 | goto free_hdr; | |
1989 | } | |
1990 | ||
061b1bd3 GKH |
1991 | staging = get_modinfo(sechdrs, infoindex, "staging"); |
1992 | if (staging) { | |
1993 | add_taint_module(mod, TAINT_CRAP); | |
1994 | printk(KERN_WARNING "%s: module is from the staging directory," | |
1995 | " the quality is unknown, you have been warned.\n", | |
1996 | mod->name); | |
1997 | } | |
1998 | ||
1da177e4 | 1999 | /* Now copy in args */ |
24277dda DA |
2000 | args = strndup_user(uargs, ~0UL >> 1); |
2001 | if (IS_ERR(args)) { | |
2002 | err = PTR_ERR(args); | |
1da177e4 LT |
2003 | goto free_hdr; |
2004 | } | |
8e08b756 | 2005 | |
1da177e4 LT |
2006 | if (find_module(mod->name)) { |
2007 | err = -EEXIST; | |
2008 | goto free_mod; | |
2009 | } | |
2010 | ||
2011 | mod->state = MODULE_STATE_COMING; | |
2012 | ||
2013 | /* Allow arches to frob section contents and sizes. */ | |
2014 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
2015 | if (err < 0) | |
2016 | goto free_mod; | |
2017 | ||
2018 | if (pcpuindex) { | |
2019 | /* We have a special allocation for this section. */ | |
2020 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, | |
842bbaaa RR |
2021 | sechdrs[pcpuindex].sh_addralign, |
2022 | mod->name); | |
1da177e4 LT |
2023 | if (!percpu) { |
2024 | err = -ENOMEM; | |
6e2b7574 | 2025 | goto free_mod; |
1da177e4 LT |
2026 | } |
2027 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2028 | mod->percpu = percpu; | |
2029 | } | |
2030 | ||
2031 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2032 | this is done generically; there doesn't appear to be any | |
2033 | special cases for the architectures. */ | |
2034 | layout_sections(mod, hdr, sechdrs, secstrings); | |
2035 | ||
2036 | /* Do the allocs. */ | |
3a642e99 | 2037 | ptr = module_alloc_update_bounds(mod->core_size); |
1da177e4 LT |
2038 | if (!ptr) { |
2039 | err = -ENOMEM; | |
2040 | goto free_percpu; | |
2041 | } | |
2042 | memset(ptr, 0, mod->core_size); | |
2043 | mod->module_core = ptr; | |
2044 | ||
3a642e99 | 2045 | ptr = module_alloc_update_bounds(mod->init_size); |
1da177e4 LT |
2046 | if (!ptr && mod->init_size) { |
2047 | err = -ENOMEM; | |
2048 | goto free_core; | |
2049 | } | |
2050 | memset(ptr, 0, mod->init_size); | |
2051 | mod->module_init = ptr; | |
2052 | ||
2053 | /* Transfer each section which specifies SHF_ALLOC */ | |
2054 | DEBUGP("final section addresses:\n"); | |
2055 | for (i = 0; i < hdr->e_shnum; i++) { | |
2056 | void *dest; | |
2057 | ||
2058 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2059 | continue; | |
2060 | ||
2061 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
2062 | dest = mod->module_init | |
2063 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
2064 | else | |
2065 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
2066 | ||
2067 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
2068 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
2069 | sechdrs[i].sh_size); | |
2070 | /* Update sh_addr to point to copy in image. */ | |
2071 | sechdrs[i].sh_addr = (unsigned long)dest; | |
2072 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
2073 | } | |
2074 | /* Module has been moved. */ | |
2075 | mod = (void *)sechdrs[modindex].sh_addr; | |
2076 | ||
6e2b7574 MH |
2077 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
2078 | mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t), | |
2079 | mod->name); | |
2080 | if (!mod->refptr) { | |
2081 | err = -ENOMEM; | |
2082 | goto free_init; | |
2083 | } | |
2084 | #endif | |
1da177e4 LT |
2085 | /* Now we've moved module, initialize linked lists, etc. */ |
2086 | module_unload_init(mod); | |
2087 | ||
97c146ef | 2088 | /* add kobject, so we can reference it. */ |
d58ae678 AM |
2089 | err = mod_sysfs_init(mod); |
2090 | if (err) | |
97c146ef | 2091 | goto free_unload; |
270a6c4c | 2092 | |
1da177e4 LT |
2093 | /* Set up license info based on the info section */ |
2094 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
2095 | ||
9b37ccfc PR |
2096 | /* |
2097 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2098 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2099 | * using GPL-only symbols it needs. | |
2100 | */ | |
fa3ba2e8 | 2101 | if (strcmp(mod->name, "ndiswrapper") == 0) |
9b37ccfc PR |
2102 | add_taint(TAINT_PROPRIETARY_MODULE); |
2103 | ||
2104 | /* driverloader was caught wrongly pretending to be under GPL */ | |
fa3ba2e8 FM |
2105 | if (strcmp(mod->name, "driverloader") == 0) |
2106 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
9841d61d | 2107 | |
c988d2b2 MD |
2108 | /* Set up MODINFO_ATTR fields */ |
2109 | setup_modinfo(mod, sechdrs, infoindex); | |
c988d2b2 | 2110 | |
1da177e4 LT |
2111 | /* Fix up syms, so that st_value is a pointer to location. */ |
2112 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
2113 | mod); | |
2114 | if (err < 0) | |
2115 | goto cleanup; | |
2116 | ||
5e458cc0 RR |
2117 | /* Now we've got everything in the final locations, we can |
2118 | * find optional sections. */ | |
2119 | kp = section_objs(hdr, sechdrs, secstrings, "__param", sizeof(*kp), | |
2120 | &num_kp); | |
2121 | mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab", | |
2122 | sizeof(*mod->syms), &mod->num_syms); | |
2123 | mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab"); | |
2124 | mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl", | |
2125 | sizeof(*mod->gpl_syms), | |
2126 | &mod->num_gpl_syms); | |
2127 | mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
2128 | mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings, | |
2129 | "__ksymtab_gpl_future", | |
2130 | sizeof(*mod->gpl_future_syms), | |
2131 | &mod->num_gpl_future_syms); | |
2132 | mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings, | |
2133 | "__kcrctab_gpl_future"); | |
1da177e4 | 2134 | |
f7f5b675 | 2135 | #ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0 RR |
2136 | mod->unused_syms = section_objs(hdr, sechdrs, secstrings, |
2137 | "__ksymtab_unused", | |
2138 | sizeof(*mod->unused_syms), | |
2139 | &mod->num_unused_syms); | |
2140 | mod->unused_crcs = section_addr(hdr, sechdrs, secstrings, | |
2141 | "__kcrctab_unused"); | |
2142 | mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings, | |
2143 | "__ksymtab_unused_gpl", | |
2144 | sizeof(*mod->unused_gpl_syms), | |
2145 | &mod->num_unused_gpl_syms); | |
2146 | mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings, | |
2147 | "__kcrctab_unused_gpl"); | |
2148 | #endif | |
2149 | ||
2150 | #ifdef CONFIG_MARKERS | |
2151 | mod->markers = section_objs(hdr, sechdrs, secstrings, "__markers", | |
2152 | sizeof(*mod->markers), &mod->num_markers); | |
2153 | #endif | |
2154 | #ifdef CONFIG_TRACEPOINTS | |
2155 | mod->tracepoints = section_objs(hdr, sechdrs, secstrings, | |
2156 | "__tracepoints", | |
2157 | sizeof(*mod->tracepoints), | |
2158 | &mod->num_tracepoints); | |
f7f5b675 | 2159 | #endif |
f71d20e9 | 2160 | |
1da177e4 | 2161 | #ifdef CONFIG_MODVERSIONS |
5e458cc0 RR |
2162 | if ((mod->num_syms && !mod->crcs) |
2163 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2164 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
f7f5b675 | 2165 | #ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0 RR |
2166 | || (mod->num_unused_syms && !mod->unused_crcs) |
2167 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
f7f5b675 DV |
2168 | #endif |
2169 | ) { | |
826e4506 LT |
2170 | printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name); |
2171 | err = try_to_force_load(mod, "nocrc"); | |
2172 | if (err) | |
2173 | goto cleanup; | |
1da177e4 LT |
2174 | } |
2175 | #endif | |
2176 | ||
2177 | /* Now do relocations. */ | |
2178 | for (i = 1; i < hdr->e_shnum; i++) { | |
2179 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
2180 | unsigned int info = sechdrs[i].sh_info; | |
2181 | ||
2182 | /* Not a valid relocation section? */ | |
2183 | if (info >= hdr->e_shnum) | |
2184 | continue; | |
2185 | ||
2186 | /* Don't bother with non-allocated sections */ | |
2187 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
2188 | continue; | |
2189 | ||
2190 | if (sechdrs[i].sh_type == SHT_REL) | |
2191 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
2192 | else if (sechdrs[i].sh_type == SHT_RELA) | |
2193 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
2194 | mod); | |
2195 | if (err < 0) | |
2196 | goto cleanup; | |
2197 | } | |
2198 | ||
eea8b54d AN |
2199 | /* Find duplicate symbols */ |
2200 | err = verify_export_symbols(mod); | |
eea8b54d AN |
2201 | if (err < 0) |
2202 | goto cleanup; | |
2203 | ||
1da177e4 | 2204 | /* Set up and sort exception table */ |
5e458cc0 RR |
2205 | mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table", |
2206 | sizeof(*mod->extable), &mod->num_exentries); | |
2207 | sort_extable(mod->extable, mod->extable + mod->num_exentries); | |
1da177e4 LT |
2208 | |
2209 | /* Finally, copy percpu area over. */ | |
2210 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, | |
2211 | sechdrs[pcpuindex].sh_size); | |
2212 | ||
2213 | add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); | |
2214 | ||
97e1c18e | 2215 | if (!mod->taints) { |
5e458cc0 RR |
2216 | struct mod_debug *debug; |
2217 | unsigned int num_debug; | |
2218 | ||
5e458cc0 RR |
2219 | debug = section_objs(hdr, sechdrs, secstrings, "__verbose", |
2220 | sizeof(*debug), &num_debug); | |
2221 | dynamic_printk_setup(debug, num_debug); | |
97e1c18e | 2222 | } |
90d595fe | 2223 | |
fed1939c | 2224 | /* sechdrs[0].sh_size is always zero */ |
5e458cc0 RR |
2225 | mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc", |
2226 | sizeof(*mseg), &num_mcount); | |
31e88909 | 2227 | ftrace_init_module(mod, mseg, mseg + num_mcount); |
90d595fe | 2228 | |
1da177e4 LT |
2229 | err = module_finalize(hdr, sechdrs, mod); |
2230 | if (err < 0) | |
2231 | goto cleanup; | |
2232 | ||
378bac82 TK |
2233 | /* flush the icache in correct context */ |
2234 | old_fs = get_fs(); | |
2235 | set_fs(KERNEL_DS); | |
2236 | ||
2237 | /* | |
2238 | * Flush the instruction cache, since we've played with text. | |
2239 | * Do it before processing of module parameters, so the module | |
2240 | * can provide parameter accessor functions of its own. | |
2241 | */ | |
2242 | if (mod->module_init) | |
2243 | flush_icache_range((unsigned long)mod->module_init, | |
2244 | (unsigned long)mod->module_init | |
2245 | + mod->init_size); | |
2246 | flush_icache_range((unsigned long)mod->module_core, | |
2247 | (unsigned long)mod->module_core + mod->core_size); | |
2248 | ||
2249 | set_fs(old_fs); | |
2250 | ||
1da177e4 | 2251 | mod->args = args; |
5e458cc0 | 2252 | if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) |
8d3b33f6 RR |
2253 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2254 | mod->name); | |
2255 | ||
bb9d3d56 | 2256 | /* Now sew it into the lists so we can get lockdep and oops |
d72b3751 AK |
2257 | * info during argument parsing. Noone should access us, since |
2258 | * strong_try_module_get() will fail. | |
2259 | * lockdep/oops can run asynchronous, so use the RCU list insertion | |
2260 | * function to insert in a way safe to concurrent readers. | |
2261 | * The mutex protects against concurrent writers. | |
2262 | */ | |
2263 | list_add_rcu(&mod->list, &modules); | |
bb9d3d56 | 2264 | |
5e458cc0 | 2265 | err = parse_args(mod->name, mod->args, kp, num_kp, NULL); |
1da177e4 | 2266 | if (err < 0) |
bb9d3d56 | 2267 | goto unlink; |
1da177e4 | 2268 | |
5e458cc0 | 2269 | err = mod_sysfs_setup(mod, kp, num_kp); |
1da177e4 | 2270 | if (err < 0) |
bb9d3d56 | 2271 | goto unlink; |
1da177e4 | 2272 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
6d760133 | 2273 | add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
1da177e4 LT |
2274 | |
2275 | /* Get rid of temporary copy */ | |
2276 | vfree(hdr); | |
2277 | ||
9e01892c | 2278 | stop_machine_destroy(); |
1da177e4 LT |
2279 | /* Done! */ |
2280 | return mod; | |
2281 | ||
bb9d3d56 | 2282 | unlink: |
9b1a4d38 | 2283 | stop_machine(__unlink_module, mod, NULL); |
1da177e4 LT |
2284 | module_arch_cleanup(mod); |
2285 | cleanup: | |
97c146ef KS |
2286 | kobject_del(&mod->mkobj.kobj); |
2287 | kobject_put(&mod->mkobj.kobj); | |
fed1939c | 2288 | ftrace_release(mod->module_core, mod->core_size); |
97c146ef | 2289 | free_unload: |
1da177e4 | 2290 | module_unload_free(mod); |
6e2b7574 MH |
2291 | free_init: |
2292 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) | |
2293 | percpu_modfree(mod->refptr); | |
2294 | #endif | |
1da177e4 LT |
2295 | module_free(mod, mod->module_init); |
2296 | free_core: | |
2297 | module_free(mod, mod->module_core); | |
6e2b7574 | 2298 | /* mod will be freed with core. Don't access it beyond this line! */ |
1da177e4 LT |
2299 | free_percpu: |
2300 | if (percpu) | |
2301 | percpu_modfree(percpu); | |
2302 | free_mod: | |
2303 | kfree(args); | |
2304 | free_hdr: | |
2305 | vfree(hdr); | |
9e01892c | 2306 | stop_machine_destroy(); |
6fe2e70b | 2307 | return ERR_PTR(err); |
1da177e4 LT |
2308 | |
2309 | truncated: | |
2310 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
2311 | err = -ENOEXEC; | |
2312 | goto free_hdr; | |
2313 | } | |
2314 | ||
1da177e4 | 2315 | /* This is where the real work happens */ |
17da2bd9 HC |
2316 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2317 | unsigned long, len, const char __user *, uargs) | |
1da177e4 LT |
2318 | { |
2319 | struct module *mod; | |
2320 | int ret = 0; | |
2321 | ||
2322 | /* Must have permission */ | |
2323 | if (!capable(CAP_SYS_MODULE)) | |
2324 | return -EPERM; | |
2325 | ||
2326 | /* Only one module load at a time, please */ | |
6389a385 | 2327 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
2328 | return -EINTR; |
2329 | ||
2330 | /* Do all the hard work */ | |
2331 | mod = load_module(umod, len, uargs); | |
2332 | if (IS_ERR(mod)) { | |
6389a385 | 2333 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2334 | return PTR_ERR(mod); |
2335 | } | |
2336 | ||
1da177e4 | 2337 | /* Drop lock so they can recurse */ |
6389a385 | 2338 | mutex_unlock(&module_mutex); |
1da177e4 | 2339 | |
e041c683 AS |
2340 | blocking_notifier_call_chain(&module_notify_list, |
2341 | MODULE_STATE_COMING, mod); | |
1da177e4 LT |
2342 | |
2343 | /* Start the module */ | |
2344 | if (mod->init != NULL) | |
59f9415f | 2345 | ret = do_one_initcall(mod->init); |
1da177e4 LT |
2346 | if (ret < 0) { |
2347 | /* Init routine failed: abort. Try to protect us from | |
2348 | buggy refcounters. */ | |
2349 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2350 | synchronize_sched(); |
af49d924 | 2351 | module_put(mod); |
df4b565e PO |
2352 | blocking_notifier_call_chain(&module_notify_list, |
2353 | MODULE_STATE_GOING, mod); | |
af49d924 RR |
2354 | mutex_lock(&module_mutex); |
2355 | free_module(mod); | |
2356 | mutex_unlock(&module_mutex); | |
c9a3ba55 | 2357 | wake_up(&module_wq); |
1da177e4 LT |
2358 | return ret; |
2359 | } | |
e24e2e64 AD |
2360 | if (ret > 0) { |
2361 | printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, " | |
2362 | "it should follow 0/-E convention\n" | |
2363 | KERN_WARNING "%s: loading module anyway...\n", | |
2364 | __func__, mod->name, ret, | |
2365 | __func__); | |
2366 | dump_stack(); | |
2367 | } | |
1da177e4 | 2368 | |
6c5db22d | 2369 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 2370 | mod->state = MODULE_STATE_LIVE; |
6c5db22d | 2371 | wake_up(&module_wq); |
0deddf43 MH |
2372 | blocking_notifier_call_chain(&module_notify_list, |
2373 | MODULE_STATE_LIVE, mod); | |
6c5db22d RR |
2374 | |
2375 | mutex_lock(&module_mutex); | |
1da177e4 LT |
2376 | /* Drop initial reference. */ |
2377 | module_put(mod); | |
2378 | module_free(mod, mod->module_init); | |
2379 | mod->module_init = NULL; | |
2380 | mod->init_size = 0; | |
2381 | mod->init_text_size = 0; | |
6389a385 | 2382 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2383 | |
2384 | return 0; | |
2385 | } | |
2386 | ||
2387 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2388 | { | |
2389 | return ((void *)addr >= start && (void *)addr < start + size); | |
2390 | } | |
2391 | ||
2392 | #ifdef CONFIG_KALLSYMS | |
2393 | /* | |
2394 | * This ignores the intensely annoying "mapping symbols" found | |
2395 | * in ARM ELF files: $a, $t and $d. | |
2396 | */ | |
2397 | static inline int is_arm_mapping_symbol(const char *str) | |
2398 | { | |
22a8bdeb | 2399 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2400 | && (str[2] == '\0' || str[2] == '.'); |
2401 | } | |
2402 | ||
2403 | static const char *get_ksymbol(struct module *mod, | |
2404 | unsigned long addr, | |
2405 | unsigned long *size, | |
2406 | unsigned long *offset) | |
2407 | { | |
2408 | unsigned int i, best = 0; | |
2409 | unsigned long nextval; | |
2410 | ||
2411 | /* At worse, next value is at end of module */ | |
a06f6211 | 2412 | if (within_module_init(addr, mod)) |
1da177e4 | 2413 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 2414 | else |
1da177e4 LT |
2415 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2416 | ||
2417 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
22a8bdeb | 2418 | starts real symbols at 1). */ |
1da177e4 LT |
2419 | for (i = 1; i < mod->num_symtab; i++) { |
2420 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2421 | continue; | |
2422 | ||
2423 | /* We ignore unnamed symbols: they're uninformative | |
2424 | * and inserted at a whim. */ | |
2425 | if (mod->symtab[i].st_value <= addr | |
2426 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2427 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2428 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2429 | best = i; | |
2430 | if (mod->symtab[i].st_value > addr | |
2431 | && mod->symtab[i].st_value < nextval | |
2432 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2433 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2434 | nextval = mod->symtab[i].st_value; | |
2435 | } | |
2436 | ||
2437 | if (!best) | |
2438 | return NULL; | |
2439 | ||
ffb45122 AD |
2440 | if (size) |
2441 | *size = nextval - mod->symtab[best].st_value; | |
2442 | if (offset) | |
2443 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2444 | return mod->strtab + mod->symtab[best].st_name; |
2445 | } | |
2446 | ||
6dd06c9f RR |
2447 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2448 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 2449 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
2450 | unsigned long *size, |
2451 | unsigned long *offset, | |
2452 | char **modname, | |
2453 | char *namebuf) | |
1da177e4 LT |
2454 | { |
2455 | struct module *mod; | |
cb2a5205 | 2456 | const char *ret = NULL; |
1da177e4 | 2457 | |
cb2a5205 | 2458 | preempt_disable(); |
d72b3751 | 2459 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2460 | if (within_module_init(addr, mod) || |
2461 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
2462 | if (modname) |
2463 | *modname = mod->name; | |
cb2a5205 RR |
2464 | ret = get_ksymbol(mod, addr, size, offset); |
2465 | break; | |
1da177e4 LT |
2466 | } |
2467 | } | |
6dd06c9f RR |
2468 | /* Make a copy in here where it's safe */ |
2469 | if (ret) { | |
2470 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
2471 | ret = namebuf; | |
2472 | } | |
cb2a5205 | 2473 | preempt_enable(); |
92dfc9dc | 2474 | return ret; |
1da177e4 LT |
2475 | } |
2476 | ||
9d65cb4a AD |
2477 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2478 | { | |
2479 | struct module *mod; | |
2480 | ||
cb2a5205 | 2481 | preempt_disable(); |
d72b3751 | 2482 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2483 | if (within_module_init(addr, mod) || |
2484 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
2485 | const char *sym; |
2486 | ||
2487 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2488 | if (!sym) | |
2489 | goto out; | |
9281acea | 2490 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 2491 | preempt_enable(); |
9d65cb4a AD |
2492 | return 0; |
2493 | } | |
2494 | } | |
2495 | out: | |
cb2a5205 | 2496 | preempt_enable(); |
9d65cb4a AD |
2497 | return -ERANGE; |
2498 | } | |
2499 | ||
a5c43dae AD |
2500 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2501 | unsigned long *offset, char *modname, char *name) | |
2502 | { | |
2503 | struct module *mod; | |
2504 | ||
cb2a5205 | 2505 | preempt_disable(); |
d72b3751 | 2506 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2507 | if (within_module_init(addr, mod) || |
2508 | within_module_core(addr, mod)) { | |
a5c43dae AD |
2509 | const char *sym; |
2510 | ||
2511 | sym = get_ksymbol(mod, addr, size, offset); | |
2512 | if (!sym) | |
2513 | goto out; | |
2514 | if (modname) | |
9281acea | 2515 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 2516 | if (name) |
9281acea | 2517 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 2518 | preempt_enable(); |
a5c43dae AD |
2519 | return 0; |
2520 | } | |
2521 | } | |
2522 | out: | |
cb2a5205 | 2523 | preempt_enable(); |
a5c43dae AD |
2524 | return -ERANGE; |
2525 | } | |
2526 | ||
ea07890a AD |
2527 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2528 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2529 | { |
2530 | struct module *mod; | |
2531 | ||
cb2a5205 | 2532 | preempt_disable(); |
d72b3751 | 2533 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
2534 | if (symnum < mod->num_symtab) { |
2535 | *value = mod->symtab[symnum].st_value; | |
2536 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2537 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
2538 | KSYM_NAME_LEN); |
2539 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 2540 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 2541 | preempt_enable(); |
ea07890a | 2542 | return 0; |
1da177e4 LT |
2543 | } |
2544 | symnum -= mod->num_symtab; | |
2545 | } | |
cb2a5205 | 2546 | preempt_enable(); |
ea07890a | 2547 | return -ERANGE; |
1da177e4 LT |
2548 | } |
2549 | ||
2550 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2551 | { | |
2552 | unsigned int i; | |
2553 | ||
2554 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2555 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2556 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2557 | return mod->symtab[i].st_value; |
2558 | return 0; | |
2559 | } | |
2560 | ||
2561 | /* Look for this name: can be of form module:name. */ | |
2562 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2563 | { | |
2564 | struct module *mod; | |
2565 | char *colon; | |
2566 | unsigned long ret = 0; | |
2567 | ||
2568 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 2569 | preempt_disable(); |
1da177e4 LT |
2570 | if ((colon = strchr(name, ':')) != NULL) { |
2571 | *colon = '\0'; | |
2572 | if ((mod = find_module(name)) != NULL) | |
2573 | ret = mod_find_symname(mod, colon+1); | |
2574 | *colon = ':'; | |
2575 | } else { | |
d72b3751 | 2576 | list_for_each_entry_rcu(mod, &modules, list) |
1da177e4 LT |
2577 | if ((ret = mod_find_symname(mod, name)) != 0) |
2578 | break; | |
2579 | } | |
cb2a5205 | 2580 | preempt_enable(); |
1da177e4 LT |
2581 | return ret; |
2582 | } | |
2583 | #endif /* CONFIG_KALLSYMS */ | |
2584 | ||
21aa9280 | 2585 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
2586 | { |
2587 | int bx = 0; | |
2588 | ||
21aa9280 AV |
2589 | if (mod->taints || |
2590 | mod->state == MODULE_STATE_GOING || | |
2591 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 2592 | buf[bx++] = '('; |
25ddbb18 | 2593 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e8 | 2594 | buf[bx++] = 'P'; |
25ddbb18 | 2595 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e8 | 2596 | buf[bx++] = 'F'; |
26e9a397 | 2597 | if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd3 | 2598 | buf[bx++] = 'C'; |
fa3ba2e8 FM |
2599 | /* |
2600 | * TAINT_FORCED_RMMOD: could be added. | |
2601 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
2602 | * apply to modules. | |
2603 | */ | |
21aa9280 AV |
2604 | |
2605 | /* Show a - for module-is-being-unloaded */ | |
2606 | if (mod->state == MODULE_STATE_GOING) | |
2607 | buf[bx++] = '-'; | |
2608 | /* Show a + for module-is-being-loaded */ | |
2609 | if (mod->state == MODULE_STATE_COMING) | |
2610 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
2611 | buf[bx++] = ')'; |
2612 | } | |
2613 | buf[bx] = '\0'; | |
2614 | ||
2615 | return buf; | |
2616 | } | |
2617 | ||
3b5d5c6b AD |
2618 | #ifdef CONFIG_PROC_FS |
2619 | /* Called by the /proc file system to return a list of modules. */ | |
2620 | static void *m_start(struct seq_file *m, loff_t *pos) | |
2621 | { | |
2622 | mutex_lock(&module_mutex); | |
2623 | return seq_list_start(&modules, *pos); | |
2624 | } | |
2625 | ||
2626 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
2627 | { | |
2628 | return seq_list_next(p, &modules, pos); | |
2629 | } | |
2630 | ||
2631 | static void m_stop(struct seq_file *m, void *p) | |
2632 | { | |
2633 | mutex_unlock(&module_mutex); | |
2634 | } | |
2635 | ||
1da177e4 LT |
2636 | static int m_show(struct seq_file *m, void *p) |
2637 | { | |
2638 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
2639 | char buf[8]; |
2640 | ||
2f0f2a33 | 2641 | seq_printf(m, "%s %u", |
1da177e4 LT |
2642 | mod->name, mod->init_size + mod->core_size); |
2643 | print_unload_info(m, mod); | |
2644 | ||
2645 | /* Informative for users. */ | |
2646 | seq_printf(m, " %s", | |
2647 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2648 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2649 | "Live"); | |
2650 | /* Used by oprofile and other similar tools. */ | |
2651 | seq_printf(m, " 0x%p", mod->module_core); | |
2652 | ||
fa3ba2e8 FM |
2653 | /* Taints info */ |
2654 | if (mod->taints) | |
21aa9280 | 2655 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 2656 | |
1da177e4 LT |
2657 | seq_printf(m, "\n"); |
2658 | return 0; | |
2659 | } | |
2660 | ||
2661 | /* Format: modulename size refcount deps address | |
2662 | ||
2663 | Where refcount is a number or -, and deps is a comma-separated list | |
2664 | of depends or -. | |
2665 | */ | |
3b5d5c6b | 2666 | static const struct seq_operations modules_op = { |
1da177e4 LT |
2667 | .start = m_start, |
2668 | .next = m_next, | |
2669 | .stop = m_stop, | |
2670 | .show = m_show | |
2671 | }; | |
2672 | ||
3b5d5c6b AD |
2673 | static int modules_open(struct inode *inode, struct file *file) |
2674 | { | |
2675 | return seq_open(file, &modules_op); | |
2676 | } | |
2677 | ||
2678 | static const struct file_operations proc_modules_operations = { | |
2679 | .open = modules_open, | |
2680 | .read = seq_read, | |
2681 | .llseek = seq_lseek, | |
2682 | .release = seq_release, | |
2683 | }; | |
2684 | ||
2685 | static int __init proc_modules_init(void) | |
2686 | { | |
2687 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
2688 | return 0; | |
2689 | } | |
2690 | module_init(proc_modules_init); | |
2691 | #endif | |
2692 | ||
1da177e4 LT |
2693 | /* Given an address, look for it in the module exception tables. */ |
2694 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2695 | { | |
1da177e4 LT |
2696 | const struct exception_table_entry *e = NULL; |
2697 | struct module *mod; | |
2698 | ||
24da1cbf | 2699 | preempt_disable(); |
d72b3751 | 2700 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
2701 | if (mod->num_exentries == 0) |
2702 | continue; | |
22a8bdeb | 2703 | |
1da177e4 LT |
2704 | e = search_extable(mod->extable, |
2705 | mod->extable + mod->num_exentries - 1, | |
2706 | addr); | |
2707 | if (e) | |
2708 | break; | |
2709 | } | |
24da1cbf | 2710 | preempt_enable(); |
1da177e4 LT |
2711 | |
2712 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 2713 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
2714 | return e; |
2715 | } | |
2716 | ||
4d435f9d IM |
2717 | /* |
2718 | * Is this a valid module address? | |
2719 | */ | |
2720 | int is_module_address(unsigned long addr) | |
2721 | { | |
4d435f9d IM |
2722 | struct module *mod; |
2723 | ||
24da1cbf | 2724 | preempt_disable(); |
4d435f9d | 2725 | |
d72b3751 | 2726 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 | 2727 | if (within_module_core(addr, mod)) { |
24da1cbf | 2728 | preempt_enable(); |
4d435f9d IM |
2729 | return 1; |
2730 | } | |
2731 | } | |
2732 | ||
24da1cbf | 2733 | preempt_enable(); |
4d435f9d IM |
2734 | |
2735 | return 0; | |
2736 | } | |
2737 | ||
2738 | ||
24da1cbf | 2739 | /* Is this a valid kernel address? */ |
8b96f011 | 2740 | __notrace_funcgraph struct module *__module_text_address(unsigned long addr) |
1da177e4 LT |
2741 | { |
2742 | struct module *mod; | |
2743 | ||
3a642e99 RR |
2744 | if (addr < module_addr_min || addr > module_addr_max) |
2745 | return NULL; | |
2746 | ||
d72b3751 | 2747 | list_for_each_entry_rcu(mod, &modules, list) |
1da177e4 LT |
2748 | if (within(addr, mod->module_init, mod->init_text_size) |
2749 | || within(addr, mod->module_core, mod->core_text_size)) | |
2750 | return mod; | |
2751 | return NULL; | |
2752 | } | |
2753 | ||
2754 | struct module *module_text_address(unsigned long addr) | |
2755 | { | |
2756 | struct module *mod; | |
1da177e4 | 2757 | |
24da1cbf | 2758 | preempt_disable(); |
1da177e4 | 2759 | mod = __module_text_address(addr); |
24da1cbf | 2760 | preempt_enable(); |
1da177e4 LT |
2761 | |
2762 | return mod; | |
2763 | } | |
2764 | ||
2765 | /* Don't grab lock, we're oopsing. */ | |
2766 | void print_modules(void) | |
2767 | { | |
2768 | struct module *mod; | |
2bc2d61a | 2769 | char buf[8]; |
1da177e4 LT |
2770 | |
2771 | printk("Modules linked in:"); | |
d72b3751 AK |
2772 | /* Most callers should already have preempt disabled, but make sure */ |
2773 | preempt_disable(); | |
2774 | list_for_each_entry_rcu(mod, &modules, list) | |
21aa9280 | 2775 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b3751 | 2776 | preempt_enable(); |
e14af7ee AV |
2777 | if (last_unloaded_module[0]) |
2778 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
2779 | printk("\n"); |
2780 | } | |
2781 | ||
1da177e4 LT |
2782 | #ifdef CONFIG_MODVERSIONS |
2783 | /* Generate the signature for struct module here, too, for modversions. */ | |
2784 | void struct_module(struct module *mod) { return; } | |
2785 | EXPORT_SYMBOL(struct_module); | |
2786 | #endif | |
8256e47c MD |
2787 | |
2788 | #ifdef CONFIG_MARKERS | |
fb40bd78 | 2789 | void module_update_markers(void) |
8256e47c MD |
2790 | { |
2791 | struct module *mod; | |
2792 | ||
2793 | mutex_lock(&module_mutex); | |
2794 | list_for_each_entry(mod, &modules, list) | |
2795 | if (!mod->taints) | |
2796 | marker_update_probe_range(mod->markers, | |
fb40bd78 | 2797 | mod->markers + mod->num_markers); |
8256e47c MD |
2798 | mutex_unlock(&module_mutex); |
2799 | } | |
2800 | #endif | |
97e1c18e MD |
2801 | |
2802 | #ifdef CONFIG_TRACEPOINTS | |
2803 | void module_update_tracepoints(void) | |
2804 | { | |
2805 | struct module *mod; | |
2806 | ||
2807 | mutex_lock(&module_mutex); | |
2808 | list_for_each_entry(mod, &modules, list) | |
2809 | if (!mod->taints) | |
2810 | tracepoint_update_probe_range(mod->tracepoints, | |
2811 | mod->tracepoints + mod->num_tracepoints); | |
2812 | mutex_unlock(&module_mutex); | |
2813 | } | |
2814 | ||
2815 | /* | |
2816 | * Returns 0 if current not found. | |
2817 | * Returns 1 if current found. | |
2818 | */ | |
2819 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) | |
2820 | { | |
2821 | struct module *iter_mod; | |
2822 | int found = 0; | |
2823 | ||
2824 | mutex_lock(&module_mutex); | |
2825 | list_for_each_entry(iter_mod, &modules, list) { | |
2826 | if (!iter_mod->taints) { | |
2827 | /* | |
2828 | * Sorted module list | |
2829 | */ | |
2830 | if (iter_mod < iter->module) | |
2831 | continue; | |
2832 | else if (iter_mod > iter->module) | |
2833 | iter->tracepoint = NULL; | |
2834 | found = tracepoint_get_iter_range(&iter->tracepoint, | |
2835 | iter_mod->tracepoints, | |
2836 | iter_mod->tracepoints | |
2837 | + iter_mod->num_tracepoints); | |
2838 | if (found) { | |
2839 | iter->module = iter_mod; | |
2840 | break; | |
2841 | } | |
2842 | } | |
2843 | } | |
2844 | mutex_unlock(&module_mutex); | |
2845 | return found; | |
2846 | } | |
2847 | #endif |