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Commit | Line | Data |
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f71d20e9 | 1 | /* |
1da177e4 LT |
2 | Copyright (C) 2002 Richard Henderson |
3 | Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/moduleloader.h> | |
6d723736 | 21 | #include <linux/ftrace_event.h> |
1da177e4 | 22 | #include <linux/init.h> |
ae84e324 | 23 | #include <linux/kallsyms.h> |
3b5d5c6b | 24 | #include <linux/fs.h> |
6d760133 | 25 | #include <linux/sysfs.h> |
9f158333 | 26 | #include <linux/kernel.h> |
1da177e4 LT |
27 | #include <linux/slab.h> |
28 | #include <linux/vmalloc.h> | |
29 | #include <linux/elf.h> | |
3b5d5c6b | 30 | #include <linux/proc_fs.h> |
1da177e4 LT |
31 | #include <linux/seq_file.h> |
32 | #include <linux/syscalls.h> | |
33 | #include <linux/fcntl.h> | |
34 | #include <linux/rcupdate.h> | |
c59ede7b | 35 | #include <linux/capability.h> |
1da177e4 LT |
36 | #include <linux/cpu.h> |
37 | #include <linux/moduleparam.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/err.h> | |
40 | #include <linux/vermagic.h> | |
41 | #include <linux/notifier.h> | |
f6a57033 | 42 | #include <linux/sched.h> |
1da177e4 LT |
43 | #include <linux/stop_machine.h> |
44 | #include <linux/device.h> | |
c988d2b2 | 45 | #include <linux/string.h> |
97d1f15b | 46 | #include <linux/mutex.h> |
d72b3751 | 47 | #include <linux/rculist.h> |
1da177e4 | 48 | #include <asm/uaccess.h> |
1da177e4 | 49 | #include <asm/cacheflush.h> |
eb8cdec4 | 50 | #include <asm/mmu_context.h> |
b817f6fe | 51 | #include <linux/license.h> |
6d762394 | 52 | #include <asm/sections.h> |
97e1c18e | 53 | #include <linux/tracepoint.h> |
90d595fe | 54 | #include <linux/ftrace.h> |
22a9d645 | 55 | #include <linux/async.h> |
fbf59bc9 | 56 | #include <linux/percpu.h> |
4f2294b6 | 57 | #include <linux/kmemleak.h> |
1da177e4 | 58 | |
7ead8b83 LZ |
59 | #define CREATE_TRACE_POINTS |
60 | #include <trace/events/module.h> | |
61 | ||
62 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
63 | ||
1da177e4 LT |
64 | #if 0 |
65 | #define DEBUGP printk | |
66 | #else | |
67 | #define DEBUGP(fmt , a...) | |
68 | #endif | |
69 | ||
70 | #ifndef ARCH_SHF_SMALL | |
71 | #define ARCH_SHF_SMALL 0 | |
72 | #endif | |
73 | ||
74 | /* If this is set, the section belongs in the init part of the module */ | |
75 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
76 | ||
24da1cbf | 77 | /* List of modules, protected by module_mutex or preempt_disable |
d72b3751 | 78 | * (delete uses stop_machine/add uses RCU list operations). */ |
c6b37801 TA |
79 | DEFINE_MUTEX(module_mutex); |
80 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 LT |
81 | static LIST_HEAD(modules); |
82 | ||
19e4529e SR |
83 | /* Block module loading/unloading? */ |
84 | int modules_disabled = 0; | |
85 | ||
c9a3ba55 RR |
86 | /* Waiting for a module to finish initializing? */ |
87 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
88 | ||
e041c683 | 89 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 90 | |
e610499e | 91 | /* Bounds of module allocation, for speeding __module_address */ |
3a642e99 RR |
92 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
93 | ||
1da177e4 LT |
94 | int register_module_notifier(struct notifier_block * nb) |
95 | { | |
e041c683 | 96 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
97 | } |
98 | EXPORT_SYMBOL(register_module_notifier); | |
99 | ||
100 | int unregister_module_notifier(struct notifier_block * nb) | |
101 | { | |
e041c683 | 102 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
103 | } |
104 | EXPORT_SYMBOL(unregister_module_notifier); | |
105 | ||
9a4b9708 ML |
106 | /* We require a truly strong try_module_get(): 0 means failure due to |
107 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
108 | static inline int strong_try_module_get(struct module *mod) |
109 | { | |
110 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
111 | return -EBUSY; |
112 | if (try_module_get(mod)) | |
1da177e4 | 113 | return 0; |
c9a3ba55 RR |
114 | else |
115 | return -ENOENT; | |
1da177e4 LT |
116 | } |
117 | ||
fa3ba2e8 FM |
118 | static inline void add_taint_module(struct module *mod, unsigned flag) |
119 | { | |
120 | add_taint(flag); | |
25ddbb18 | 121 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
122 | } |
123 | ||
02a3e59a RD |
124 | /* |
125 | * A thread that wants to hold a reference to a module only while it | |
126 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
127 | */ |
128 | void __module_put_and_exit(struct module *mod, long code) | |
129 | { | |
130 | module_put(mod); | |
131 | do_exit(code); | |
132 | } | |
133 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 134 | |
1da177e4 LT |
135 | /* Find a module section: 0 means not found. */ |
136 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
137 | Elf_Shdr *sechdrs, | |
138 | const char *secstrings, | |
139 | const char *name) | |
140 | { | |
141 | unsigned int i; | |
142 | ||
143 | for (i = 1; i < hdr->e_shnum; i++) | |
144 | /* Alloc bit cleared means "ignore it." */ | |
145 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
146 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
147 | return i; | |
148 | return 0; | |
149 | } | |
150 | ||
5e458cc0 RR |
151 | /* Find a module section, or NULL. */ |
152 | static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs, | |
153 | const char *secstrings, const char *name) | |
154 | { | |
155 | /* Section 0 has sh_addr 0. */ | |
156 | return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr; | |
157 | } | |
158 | ||
159 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
160 | static void *section_objs(Elf_Ehdr *hdr, | |
161 | Elf_Shdr *sechdrs, | |
162 | const char *secstrings, | |
163 | const char *name, | |
164 | size_t object_size, | |
165 | unsigned int *num) | |
166 | { | |
167 | unsigned int sec = find_sec(hdr, sechdrs, secstrings, name); | |
168 | ||
169 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
170 | *num = sechdrs[sec].sh_size / object_size; | |
171 | return (void *)sechdrs[sec].sh_addr; | |
172 | } | |
173 | ||
1da177e4 LT |
174 | /* Provided by the linker */ |
175 | extern const struct kernel_symbol __start___ksymtab[]; | |
176 | extern const struct kernel_symbol __stop___ksymtab[]; | |
177 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
178 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
179 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
180 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
f71d20e9 AV |
181 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
182 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
183 | extern const unsigned long __start___kcrctab[]; |
184 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 185 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
186 | #ifdef CONFIG_UNUSED_SYMBOLS |
187 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
188 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
189 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
190 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
191 | extern const unsigned long __start___kcrctab_unused[]; |
192 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 193 | #endif |
1da177e4 LT |
194 | |
195 | #ifndef CONFIG_MODVERSIONS | |
196 | #define symversion(base, idx) NULL | |
197 | #else | |
f83ca9fe | 198 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
199 | #endif |
200 | ||
dafd0940 RR |
201 | static bool each_symbol_in_section(const struct symsearch *arr, |
202 | unsigned int arrsize, | |
203 | struct module *owner, | |
204 | bool (*fn)(const struct symsearch *syms, | |
205 | struct module *owner, | |
206 | unsigned int symnum, void *data), | |
207 | void *data) | |
ad9546c9 | 208 | { |
dafd0940 | 209 | unsigned int i, j; |
ad9546c9 | 210 | |
dafd0940 RR |
211 | for (j = 0; j < arrsize; j++) { |
212 | for (i = 0; i < arr[j].stop - arr[j].start; i++) | |
213 | if (fn(&arr[j], owner, i, data)) | |
214 | return true; | |
f71d20e9 | 215 | } |
dafd0940 RR |
216 | |
217 | return false; | |
ad9546c9 RR |
218 | } |
219 | ||
dafd0940 | 220 | /* Returns true as soon as fn returns true, otherwise false. */ |
c6b37801 TA |
221 | bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner, |
222 | unsigned int symnum, void *data), 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 | } | |
c6b37801 | 275 | EXPORT_SYMBOL_GPL(each_symbol); |
dafd0940 RR |
276 | |
277 | struct find_symbol_arg { | |
278 | /* Input */ | |
279 | const char *name; | |
280 | bool gplok; | |
281 | bool warn; | |
282 | ||
283 | /* Output */ | |
284 | struct module *owner; | |
285 | const unsigned long *crc; | |
414fd31b | 286 | const struct kernel_symbol *sym; |
dafd0940 RR |
287 | }; |
288 | ||
289 | static bool find_symbol_in_section(const struct symsearch *syms, | |
290 | struct module *owner, | |
291 | unsigned int symnum, void *data) | |
292 | { | |
293 | struct find_symbol_arg *fsa = data; | |
294 | ||
295 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) | |
296 | return false; | |
297 | ||
298 | if (!fsa->gplok) { | |
299 | if (syms->licence == GPL_ONLY) | |
300 | return false; | |
301 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
302 | printk(KERN_WARNING "Symbol %s is being used " | |
303 | "by a non-GPL module, which will not " | |
304 | "be allowed in the future\n", fsa->name); | |
305 | printk(KERN_WARNING "Please see the file " | |
306 | "Documentation/feature-removal-schedule.txt " | |
307 | "in the kernel source tree for more details.\n"); | |
9f28bb7e | 308 | } |
1da177e4 | 309 | } |
ad9546c9 | 310 | |
f7f5b675 | 311 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
312 | if (syms->unused && fsa->warn) { |
313 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
314 | "however this module is using it.\n", fsa->name); | |
315 | printk(KERN_WARNING | |
316 | "This symbol will go away in the future.\n"); | |
317 | printk(KERN_WARNING | |
318 | "Please evalute if this is the right api to use and if " | |
319 | "it really is, submit a report the linux kernel " | |
320 | "mailinglist together with submitting your code for " | |
321 | "inclusion.\n"); | |
322 | } | |
f7f5b675 | 323 | #endif |
dafd0940 RR |
324 | |
325 | fsa->owner = owner; | |
326 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 327 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
328 | return true; |
329 | } | |
330 | ||
414fd31b TA |
331 | /* Find a symbol and return it, along with, (optional) crc and |
332 | * (optional) module which owns it */ | |
c6b37801 TA |
333 | const struct kernel_symbol *find_symbol(const char *name, |
334 | struct module **owner, | |
335 | const unsigned long **crc, | |
336 | bool gplok, | |
337 | bool warn) | |
dafd0940 RR |
338 | { |
339 | struct find_symbol_arg fsa; | |
340 | ||
341 | fsa.name = name; | |
342 | fsa.gplok = gplok; | |
343 | fsa.warn = warn; | |
344 | ||
345 | if (each_symbol(find_symbol_in_section, &fsa)) { | |
346 | if (owner) | |
347 | *owner = fsa.owner; | |
348 | if (crc) | |
349 | *crc = fsa.crc; | |
414fd31b | 350 | return fsa.sym; |
dafd0940 RR |
351 | } |
352 | ||
1da177e4 | 353 | DEBUGP("Failed to find symbol %s\n", name); |
414fd31b | 354 | return NULL; |
1da177e4 | 355 | } |
c6b37801 | 356 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 357 | |
1da177e4 | 358 | /* Search for module by name: must hold module_mutex. */ |
c6b37801 | 359 | struct module *find_module(const char *name) |
1da177e4 LT |
360 | { |
361 | struct module *mod; | |
362 | ||
363 | list_for_each_entry(mod, &modules, list) { | |
364 | if (strcmp(mod->name, name) == 0) | |
365 | return mod; | |
366 | } | |
367 | return NULL; | |
368 | } | |
c6b37801 | 369 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
370 | |
371 | #ifdef CONFIG_SMP | |
fbf59bc9 | 372 | |
e74e3962 | 373 | #ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA |
fbf59bc9 TH |
374 | |
375 | static void *percpu_modalloc(unsigned long size, unsigned long align, | |
376 | const char *name) | |
377 | { | |
378 | void *ptr; | |
379 | ||
380 | if (align > PAGE_SIZE) { | |
381 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
382 | name, align, PAGE_SIZE); | |
383 | align = PAGE_SIZE; | |
384 | } | |
385 | ||
edcb4639 | 386 | ptr = __alloc_reserved_percpu(size, align); |
fbf59bc9 TH |
387 | if (!ptr) |
388 | printk(KERN_WARNING | |
389 | "Could not allocate %lu bytes percpu data\n", size); | |
390 | return ptr; | |
391 | } | |
392 | ||
393 | static void percpu_modfree(void *freeme) | |
394 | { | |
395 | free_percpu(freeme); | |
396 | } | |
397 | ||
e74e3962 | 398 | #else /* ... CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
fbf59bc9 | 399 | |
1da177e4 LT |
400 | /* Number of blocks used and allocated. */ |
401 | static unsigned int pcpu_num_used, pcpu_num_allocated; | |
402 | /* Size of each block. -ve means used. */ | |
403 | static int *pcpu_size; | |
404 | ||
405 | static int split_block(unsigned int i, unsigned short size) | |
406 | { | |
407 | /* Reallocation required? */ | |
408 | if (pcpu_num_used + 1 > pcpu_num_allocated) { | |
6d4f9c55 PE |
409 | int *new; |
410 | ||
411 | new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, | |
412 | GFP_KERNEL); | |
1da177e4 LT |
413 | if (!new) |
414 | return 0; | |
415 | ||
1da177e4 | 416 | pcpu_num_allocated *= 2; |
1da177e4 LT |
417 | pcpu_size = new; |
418 | } | |
419 | ||
420 | /* Insert a new subblock */ | |
421 | memmove(&pcpu_size[i+1], &pcpu_size[i], | |
422 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); | |
423 | pcpu_num_used++; | |
424 | ||
425 | pcpu_size[i+1] -= size; | |
426 | pcpu_size[i] = size; | |
427 | return 1; | |
428 | } | |
429 | ||
430 | static inline unsigned int block_size(int val) | |
431 | { | |
432 | if (val < 0) | |
433 | return -val; | |
434 | return val; | |
435 | } | |
436 | ||
842bbaaa RR |
437 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
438 | const char *name) | |
1da177e4 LT |
439 | { |
440 | unsigned long extra; | |
441 | unsigned int i; | |
442 | void *ptr; | |
4f2294b6 | 443 | int cpu; |
1da177e4 | 444 | |
b6e3590f JF |
445 | if (align > PAGE_SIZE) { |
446 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
447 | name, align, PAGE_SIZE); | |
448 | align = PAGE_SIZE; | |
842bbaaa | 449 | } |
1da177e4 LT |
450 | |
451 | ptr = __per_cpu_start; | |
452 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
453 | /* Extra for alignment requirement. */ | |
454 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; | |
455 | BUG_ON(i == 0 && extra != 0); | |
456 | ||
457 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) | |
458 | continue; | |
459 | ||
460 | /* Transfer extra to previous block. */ | |
461 | if (pcpu_size[i-1] < 0) | |
462 | pcpu_size[i-1] -= extra; | |
463 | else | |
464 | pcpu_size[i-1] += extra; | |
465 | pcpu_size[i] -= extra; | |
466 | ptr += extra; | |
467 | ||
468 | /* Split block if warranted */ | |
469 | if (pcpu_size[i] - size > sizeof(unsigned long)) | |
470 | if (!split_block(i, size)) | |
471 | return NULL; | |
472 | ||
4f2294b6 CM |
473 | /* add the per-cpu scanning areas */ |
474 | for_each_possible_cpu(cpu) | |
475 | kmemleak_alloc(ptr + per_cpu_offset(cpu), size, 0, | |
476 | GFP_KERNEL); | |
477 | ||
1da177e4 LT |
478 | /* Mark allocated */ |
479 | pcpu_size[i] = -pcpu_size[i]; | |
480 | return ptr; | |
481 | } | |
482 | ||
483 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", | |
484 | size); | |
485 | return NULL; | |
486 | } | |
487 | ||
488 | static void percpu_modfree(void *freeme) | |
489 | { | |
490 | unsigned int i; | |
491 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); | |
4f2294b6 | 492 | int cpu; |
1da177e4 LT |
493 | |
494 | /* First entry is core kernel percpu data. */ | |
495 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
496 | if (ptr == freeme) { | |
497 | pcpu_size[i] = -pcpu_size[i]; | |
498 | goto free; | |
499 | } | |
500 | } | |
501 | BUG(); | |
502 | ||
503 | free: | |
4f2294b6 CM |
504 | /* remove the per-cpu scanning areas */ |
505 | for_each_possible_cpu(cpu) | |
506 | kmemleak_free(freeme + per_cpu_offset(cpu)); | |
507 | ||
1da177e4 LT |
508 | /* Merge with previous? */ |
509 | if (pcpu_size[i-1] >= 0) { | |
510 | pcpu_size[i-1] += pcpu_size[i]; | |
511 | pcpu_num_used--; | |
512 | memmove(&pcpu_size[i], &pcpu_size[i+1], | |
513 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); | |
514 | i--; | |
515 | } | |
516 | /* Merge with next? */ | |
517 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { | |
518 | pcpu_size[i] += pcpu_size[i+1]; | |
519 | pcpu_num_used--; | |
520 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], | |
521 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); | |
522 | } | |
523 | } | |
524 | ||
1da177e4 LT |
525 | static int percpu_modinit(void) |
526 | { | |
527 | pcpu_num_used = 2; | |
528 | pcpu_num_allocated = 2; | |
529 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, | |
530 | GFP_KERNEL); | |
531 | /* Static in-kernel percpu data (used). */ | |
b00742d3 | 532 | pcpu_size[0] = -(__per_cpu_end-__per_cpu_start); |
1da177e4 LT |
533 | /* Free room. */ |
534 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; | |
535 | if (pcpu_size[1] < 0) { | |
536 | printk(KERN_ERR "No per-cpu room for modules.\n"); | |
537 | pcpu_num_used = 1; | |
538 | } | |
539 | ||
540 | return 0; | |
22a8bdeb | 541 | } |
1da177e4 | 542 | __initcall(percpu_modinit); |
6b588c18 | 543 | |
e74e3962 | 544 | #endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
fbf59bc9 | 545 | |
6b588c18 TH |
546 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, |
547 | Elf_Shdr *sechdrs, | |
548 | const char *secstrings) | |
549 | { | |
550 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); | |
551 | } | |
552 | ||
553 | static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size) | |
554 | { | |
555 | int cpu; | |
556 | ||
557 | for_each_possible_cpu(cpu) | |
558 | memcpy(pcpudest + per_cpu_offset(cpu), from, size); | |
559 | } | |
560 | ||
1da177e4 | 561 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 562 | |
842bbaaa RR |
563 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
564 | const char *name) | |
1da177e4 LT |
565 | { |
566 | return NULL; | |
567 | } | |
568 | static inline void percpu_modfree(void *pcpuptr) | |
569 | { | |
570 | BUG(); | |
571 | } | |
572 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
573 | Elf_Shdr *sechdrs, | |
574 | const char *secstrings) | |
575 | { | |
576 | return 0; | |
577 | } | |
578 | static inline void percpu_modcopy(void *pcpudst, const void *src, | |
579 | unsigned long size) | |
580 | { | |
581 | /* pcpusec should be 0, and size of that section should be 0. */ | |
582 | BUG_ON(size != 0); | |
583 | } | |
6b588c18 | 584 | |
1da177e4 LT |
585 | #endif /* CONFIG_SMP */ |
586 | ||
c988d2b2 MD |
587 | #define MODINFO_ATTR(field) \ |
588 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
589 | { \ | |
590 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
591 | } \ | |
592 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
593 | struct module *mod, char *buffer) \ | |
594 | { \ | |
595 | return sprintf(buffer, "%s\n", mod->field); \ | |
596 | } \ | |
597 | static int modinfo_##field##_exists(struct module *mod) \ | |
598 | { \ | |
599 | return mod->field != NULL; \ | |
600 | } \ | |
601 | static void free_modinfo_##field(struct module *mod) \ | |
602 | { \ | |
22a8bdeb DW |
603 | kfree(mod->field); \ |
604 | mod->field = NULL; \ | |
c988d2b2 MD |
605 | } \ |
606 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 607 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
608 | .show = show_modinfo_##field, \ |
609 | .setup = setup_modinfo_##field, \ | |
610 | .test = modinfo_##field##_exists, \ | |
611 | .free = free_modinfo_##field, \ | |
612 | }; | |
613 | ||
614 | MODINFO_ATTR(version); | |
615 | MODINFO_ATTR(srcversion); | |
616 | ||
e14af7ee AV |
617 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
618 | ||
03e88ae1 | 619 | #ifdef CONFIG_MODULE_UNLOAD |
1da177e4 LT |
620 | /* Init the unload section of the module. */ |
621 | static void module_unload_init(struct module *mod) | |
622 | { | |
720eba31 | 623 | int cpu; |
1da177e4 LT |
624 | |
625 | INIT_LIST_HEAD(&mod->modules_which_use_me); | |
720eba31 ED |
626 | for_each_possible_cpu(cpu) |
627 | local_set(__module_ref_addr(mod, cpu), 0); | |
1da177e4 | 628 | /* Hold reference count during initialization. */ |
720eba31 | 629 | local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1); |
1da177e4 LT |
630 | /* Backwards compatibility macros put refcount during init. */ |
631 | mod->waiter = current; | |
632 | } | |
633 | ||
634 | /* modules using other modules */ | |
635 | struct module_use | |
636 | { | |
637 | struct list_head list; | |
638 | struct module *module_which_uses; | |
639 | }; | |
640 | ||
641 | /* Does a already use b? */ | |
642 | static int already_uses(struct module *a, struct module *b) | |
643 | { | |
644 | struct module_use *use; | |
645 | ||
646 | list_for_each_entry(use, &b->modules_which_use_me, list) { | |
647 | if (use->module_which_uses == a) { | |
648 | DEBUGP("%s uses %s!\n", a->name, b->name); | |
649 | return 1; | |
650 | } | |
651 | } | |
652 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
653 | return 0; | |
654 | } | |
655 | ||
656 | /* Module a uses b */ | |
c6b37801 | 657 | int use_module(struct module *a, struct module *b) |
1da177e4 LT |
658 | { |
659 | struct module_use *use; | |
c9a3ba55 | 660 | int no_warn, err; |
270a6c4c | 661 | |
1da177e4 LT |
662 | if (b == NULL || already_uses(a, b)) return 1; |
663 | ||
c9a3ba55 RR |
664 | /* If we're interrupted or time out, we fail. */ |
665 | if (wait_event_interruptible_timeout( | |
666 | module_wq, (err = strong_try_module_get(b)) != -EBUSY, | |
667 | 30 * HZ) <= 0) { | |
668 | printk("%s: gave up waiting for init of module %s.\n", | |
669 | a->name, b->name); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | /* If strong_try_module_get() returned a different error, we fail. */ | |
674 | if (err) | |
1da177e4 LT |
675 | return 0; |
676 | ||
677 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
678 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
679 | if (!use) { | |
680 | printk("%s: out of memory loading\n", a->name); | |
681 | module_put(b); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | use->module_which_uses = a; | |
686 | list_add(&use->list, &b->modules_which_use_me); | |
270a6c4c | 687 | no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
1da177e4 LT |
688 | return 1; |
689 | } | |
c6b37801 | 690 | EXPORT_SYMBOL_GPL(use_module); |
1da177e4 LT |
691 | |
692 | /* Clear the unload stuff of the module. */ | |
693 | static void module_unload_free(struct module *mod) | |
694 | { | |
695 | struct module *i; | |
696 | ||
697 | list_for_each_entry(i, &modules, list) { | |
698 | struct module_use *use; | |
699 | ||
700 | list_for_each_entry(use, &i->modules_which_use_me, list) { | |
701 | if (use->module_which_uses == mod) { | |
702 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
703 | module_put(i); | |
704 | list_del(&use->list); | |
705 | kfree(use); | |
270a6c4c | 706 | sysfs_remove_link(i->holders_dir, mod->name); |
1da177e4 LT |
707 | /* There can be at most one match. */ |
708 | break; | |
709 | } | |
710 | } | |
711 | } | |
712 | } | |
713 | ||
714 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 715 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
716 | { |
717 | int ret = (flags & O_TRUNC); | |
718 | if (ret) | |
fb169793 | 719 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
720 | return ret; |
721 | } | |
722 | #else | |
fb169793 | 723 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
724 | { |
725 | return 0; | |
726 | } | |
727 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
728 | ||
729 | struct stopref | |
730 | { | |
731 | struct module *mod; | |
732 | int flags; | |
733 | int *forced; | |
734 | }; | |
735 | ||
736 | /* Whole machine is stopped with interrupts off when this runs. */ | |
737 | static int __try_stop_module(void *_sref) | |
738 | { | |
739 | struct stopref *sref = _sref; | |
740 | ||
da39ba5e RR |
741 | /* If it's not unused, quit unless we're forcing. */ |
742 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 743 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
744 | return -EWOULDBLOCK; |
745 | } | |
746 | ||
747 | /* Mark it as dying. */ | |
748 | sref->mod->state = MODULE_STATE_GOING; | |
749 | return 0; | |
750 | } | |
751 | ||
752 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
753 | { | |
da39ba5e RR |
754 | if (flags & O_NONBLOCK) { |
755 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 756 | |
9b1a4d38 | 757 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
758 | } else { |
759 | /* We don't need to stop the machine for this. */ | |
760 | mod->state = MODULE_STATE_GOING; | |
761 | synchronize_sched(); | |
762 | return 0; | |
763 | } | |
1da177e4 LT |
764 | } |
765 | ||
766 | unsigned int module_refcount(struct module *mod) | |
767 | { | |
720eba31 ED |
768 | unsigned int total = 0; |
769 | int cpu; | |
1da177e4 | 770 | |
720eba31 ED |
771 | for_each_possible_cpu(cpu) |
772 | total += local_read(__module_ref_addr(mod, cpu)); | |
1da177e4 LT |
773 | return total; |
774 | } | |
775 | EXPORT_SYMBOL(module_refcount); | |
776 | ||
777 | /* This exists whether we can unload or not */ | |
778 | static void free_module(struct module *mod); | |
779 | ||
780 | static void wait_for_zero_refcount(struct module *mod) | |
781 | { | |
a6550207 | 782 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 783 | mutex_unlock(&module_mutex); |
1da177e4 LT |
784 | for (;;) { |
785 | DEBUGP("Looking at refcount...\n"); | |
786 | set_current_state(TASK_UNINTERRUPTIBLE); | |
787 | if (module_refcount(mod) == 0) | |
788 | break; | |
789 | schedule(); | |
790 | } | |
791 | current->state = TASK_RUNNING; | |
6389a385 | 792 | mutex_lock(&module_mutex); |
1da177e4 LT |
793 | } |
794 | ||
17da2bd9 HC |
795 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
796 | unsigned int, flags) | |
1da177e4 LT |
797 | { |
798 | struct module *mod; | |
dfff0a06 | 799 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
800 | int ret, forced = 0; |
801 | ||
3d43321b | 802 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
803 | return -EPERM; |
804 | ||
805 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
806 | return -EFAULT; | |
807 | name[MODULE_NAME_LEN-1] = '\0'; | |
808 | ||
9e01892c HC |
809 | /* Create stop_machine threads since free_module relies on |
810 | * a non-failing stop_machine call. */ | |
811 | ret = stop_machine_create(); | |
812 | if (ret) | |
813 | return ret; | |
814 | ||
815 | if (mutex_lock_interruptible(&module_mutex) != 0) { | |
816 | ret = -EINTR; | |
817 | goto out_stop; | |
818 | } | |
1da177e4 LT |
819 | |
820 | mod = find_module(name); | |
821 | if (!mod) { | |
822 | ret = -ENOENT; | |
823 | goto out; | |
824 | } | |
825 | ||
826 | if (!list_empty(&mod->modules_which_use_me)) { | |
827 | /* Other modules depend on us: get rid of them first. */ | |
828 | ret = -EWOULDBLOCK; | |
829 | goto out; | |
830 | } | |
831 | ||
832 | /* Doing init or already dying? */ | |
833 | if (mod->state != MODULE_STATE_LIVE) { | |
834 | /* FIXME: if (force), slam module count and wake up | |
835 | waiter --RR */ | |
836 | DEBUGP("%s already dying\n", mod->name); | |
837 | ret = -EBUSY; | |
838 | goto out; | |
839 | } | |
840 | ||
841 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 842 | if (mod->init && !mod->exit) { |
fb169793 | 843 | forced = try_force_unload(flags); |
1da177e4 LT |
844 | if (!forced) { |
845 | /* This module can't be removed */ | |
846 | ret = -EBUSY; | |
847 | goto out; | |
848 | } | |
849 | } | |
850 | ||
851 | /* Set this up before setting mod->state */ | |
852 | mod->waiter = current; | |
853 | ||
854 | /* Stop the machine so refcounts can't move and disable module. */ | |
855 | ret = try_stop_module(mod, flags, &forced); | |
856 | if (ret != 0) | |
857 | goto out; | |
858 | ||
859 | /* Never wait if forced. */ | |
860 | if (!forced && module_refcount(mod) != 0) | |
861 | wait_for_zero_refcount(mod); | |
862 | ||
df4b565e | 863 | mutex_unlock(&module_mutex); |
1da177e4 | 864 | /* Final destruction now noone is using it. */ |
df4b565e | 865 | if (mod->exit != NULL) |
1da177e4 | 866 | mod->exit(); |
df4b565e PO |
867 | blocking_notifier_call_chain(&module_notify_list, |
868 | MODULE_STATE_GOING, mod); | |
22a9d645 | 869 | async_synchronize_full(); |
df4b565e | 870 | mutex_lock(&module_mutex); |
e14af7ee | 871 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 872 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
e9d376f0 | 873 | ddebug_remove_module(mod->name); |
1da177e4 LT |
874 | free_module(mod); |
875 | ||
876 | out: | |
6389a385 | 877 | mutex_unlock(&module_mutex); |
9e01892c HC |
878 | out_stop: |
879 | stop_machine_destroy(); | |
1da177e4 LT |
880 | return ret; |
881 | } | |
882 | ||
d1e99d7a | 883 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
884 | { |
885 | struct module_use *use; | |
886 | int printed_something = 0; | |
887 | ||
888 | seq_printf(m, " %u ", module_refcount(mod)); | |
889 | ||
890 | /* Always include a trailing , so userspace can differentiate | |
891 | between this and the old multi-field proc format. */ | |
892 | list_for_each_entry(use, &mod->modules_which_use_me, list) { | |
893 | printed_something = 1; | |
894 | seq_printf(m, "%s,", use->module_which_uses->name); | |
895 | } | |
896 | ||
1da177e4 LT |
897 | if (mod->init != NULL && mod->exit == NULL) { |
898 | printed_something = 1; | |
899 | seq_printf(m, "[permanent],"); | |
900 | } | |
901 | ||
902 | if (!printed_something) | |
903 | seq_printf(m, "-"); | |
904 | } | |
905 | ||
906 | void __symbol_put(const char *symbol) | |
907 | { | |
908 | struct module *owner; | |
1da177e4 | 909 | |
24da1cbf | 910 | preempt_disable(); |
414fd31b | 911 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
912 | BUG(); |
913 | module_put(owner); | |
24da1cbf | 914 | preempt_enable(); |
1da177e4 LT |
915 | } |
916 | EXPORT_SYMBOL(__symbol_put); | |
917 | ||
7d1d16e4 | 918 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
919 | void symbol_put_addr(void *addr) |
920 | { | |
5e376613 | 921 | struct module *modaddr; |
7d1d16e4 | 922 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 923 | |
7d1d16e4 | 924 | if (core_kernel_text(a)) |
5e376613 | 925 | return; |
1da177e4 | 926 | |
a6e6abd5 RR |
927 | /* module_text_address is safe here: we're supposed to have reference |
928 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 929 | modaddr = __module_text_address(a); |
a6e6abd5 | 930 | BUG_ON(!modaddr); |
5e376613 | 931 | module_put(modaddr); |
1da177e4 LT |
932 | } |
933 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
934 | ||
935 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
936 | struct module *mod, char *buffer) | |
937 | { | |
256e2fdf | 938 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
939 | } |
940 | ||
941 | static struct module_attribute refcnt = { | |
7b595756 | 942 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
943 | .show = show_refcnt, |
944 | }; | |
945 | ||
f6a57033 AV |
946 | void module_put(struct module *module) |
947 | { | |
948 | if (module) { | |
949 | unsigned int cpu = get_cpu(); | |
720eba31 | 950 | local_dec(__module_ref_addr(module, cpu)); |
7ead8b83 LZ |
951 | trace_module_put(module, _RET_IP_, |
952 | local_read(__module_ref_addr(module, cpu))); | |
f6a57033 AV |
953 | /* Maybe they're waiting for us to drop reference? */ |
954 | if (unlikely(!module_is_live(module))) | |
955 | wake_up_process(module->waiter); | |
956 | put_cpu(); | |
957 | } | |
958 | } | |
959 | EXPORT_SYMBOL(module_put); | |
960 | ||
1da177e4 | 961 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 962 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
963 | { |
964 | /* We don't know the usage count, or what modules are using. */ | |
965 | seq_printf(m, " - -"); | |
966 | } | |
967 | ||
968 | static inline void module_unload_free(struct module *mod) | |
969 | { | |
970 | } | |
971 | ||
c6b37801 | 972 | int use_module(struct module *a, struct module *b) |
1da177e4 | 973 | { |
c9a3ba55 | 974 | return strong_try_module_get(b) == 0; |
1da177e4 | 975 | } |
c6b37801 | 976 | EXPORT_SYMBOL_GPL(use_module); |
1da177e4 LT |
977 | |
978 | static inline void module_unload_init(struct module *mod) | |
979 | { | |
980 | } | |
981 | #endif /* CONFIG_MODULE_UNLOAD */ | |
982 | ||
1f71740a KS |
983 | static ssize_t show_initstate(struct module_attribute *mattr, |
984 | struct module *mod, char *buffer) | |
985 | { | |
986 | const char *state = "unknown"; | |
987 | ||
988 | switch (mod->state) { | |
989 | case MODULE_STATE_LIVE: | |
990 | state = "live"; | |
991 | break; | |
992 | case MODULE_STATE_COMING: | |
993 | state = "coming"; | |
994 | break; | |
995 | case MODULE_STATE_GOING: | |
996 | state = "going"; | |
997 | break; | |
998 | } | |
999 | return sprintf(buffer, "%s\n", state); | |
1000 | } | |
1001 | ||
1002 | static struct module_attribute initstate = { | |
7b595756 | 1003 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
1004 | .show = show_initstate, |
1005 | }; | |
1006 | ||
03e88ae1 GKH |
1007 | static struct module_attribute *modinfo_attrs[] = { |
1008 | &modinfo_version, | |
1009 | &modinfo_srcversion, | |
1f71740a | 1010 | &initstate, |
03e88ae1 GKH |
1011 | #ifdef CONFIG_MODULE_UNLOAD |
1012 | &refcnt, | |
1013 | #endif | |
1014 | NULL, | |
1015 | }; | |
1016 | ||
1da177e4 LT |
1017 | static const char vermagic[] = VERMAGIC_STRING; |
1018 | ||
c6e665c8 | 1019 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1020 | { |
1021 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1022 | if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8 RR |
1023 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
1024 | mod->name, reason); | |
826e4506 LT |
1025 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1026 | return 0; | |
1027 | #else | |
1028 | return -ENOEXEC; | |
1029 | #endif | |
1030 | } | |
1031 | ||
1da177e4 LT |
1032 | #ifdef CONFIG_MODVERSIONS |
1033 | static int check_version(Elf_Shdr *sechdrs, | |
1034 | unsigned int versindex, | |
1035 | const char *symname, | |
1036 | struct module *mod, | |
1037 | const unsigned long *crc) | |
1038 | { | |
1039 | unsigned int i, num_versions; | |
1040 | struct modversion_info *versions; | |
1041 | ||
1042 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1043 | if (!crc) | |
1044 | return 1; | |
1045 | ||
a5dd6970 RR |
1046 | /* No versions at all? modprobe --force does this. */ |
1047 | if (versindex == 0) | |
1048 | return try_to_force_load(mod, symname) == 0; | |
1049 | ||
1da177e4 LT |
1050 | versions = (void *) sechdrs[versindex].sh_addr; |
1051 | num_versions = sechdrs[versindex].sh_size | |
1052 | / sizeof(struct modversion_info); | |
1053 | ||
1054 | for (i = 0; i < num_versions; i++) { | |
1055 | if (strcmp(versions[i].name, symname) != 0) | |
1056 | continue; | |
1057 | ||
1058 | if (versions[i].crc == *crc) | |
1059 | return 1; | |
1da177e4 LT |
1060 | DEBUGP("Found checksum %lX vs module %lX\n", |
1061 | *crc, versions[i].crc); | |
826e4506 | 1062 | goto bad_version; |
1da177e4 | 1063 | } |
826e4506 | 1064 | |
a5dd6970 RR |
1065 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1066 | mod->name, symname); | |
1067 | return 0; | |
826e4506 LT |
1068 | |
1069 | bad_version: | |
1070 | printk("%s: disagrees about version of symbol %s\n", | |
1071 | mod->name, symname); | |
1072 | return 0; | |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1076 | unsigned int versindex, | |
1077 | struct module *mod) | |
1078 | { | |
1079 | const unsigned long *crc; | |
1da177e4 | 1080 | |
6560dc16 MF |
1081 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
1082 | &crc, true, false)) | |
1da177e4 | 1083 | BUG(); |
8c8ef42a | 1084 | return check_version(sechdrs, versindex, "module_layout", mod, crc); |
1da177e4 LT |
1085 | } |
1086 | ||
91e37a79 RR |
1087 | /* First part is kernel version, which we ignore if module has crcs. */ |
1088 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1089 | bool has_crcs) | |
1da177e4 | 1090 | { |
91e37a79 RR |
1091 | if (has_crcs) { |
1092 | amagic += strcspn(amagic, " "); | |
1093 | bmagic += strcspn(bmagic, " "); | |
1094 | } | |
1da177e4 LT |
1095 | return strcmp(amagic, bmagic) == 0; |
1096 | } | |
1097 | #else | |
1098 | static inline int check_version(Elf_Shdr *sechdrs, | |
1099 | unsigned int versindex, | |
1100 | const char *symname, | |
1101 | struct module *mod, | |
1102 | const unsigned long *crc) | |
1103 | { | |
1104 | return 1; | |
1105 | } | |
1106 | ||
1107 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1108 | unsigned int versindex, | |
1109 | struct module *mod) | |
1110 | { | |
1111 | return 1; | |
1112 | } | |
1113 | ||
91e37a79 RR |
1114 | static inline int same_magic(const char *amagic, const char *bmagic, |
1115 | bool has_crcs) | |
1da177e4 LT |
1116 | { |
1117 | return strcmp(amagic, bmagic) == 0; | |
1118 | } | |
1119 | #endif /* CONFIG_MODVERSIONS */ | |
1120 | ||
1121 | /* Resolve a symbol for this module. I.e. if we find one, record usage. | |
1122 | Must be holding module_mutex. */ | |
414fd31b TA |
1123 | static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs, |
1124 | unsigned int versindex, | |
1125 | const char *name, | |
1126 | struct module *mod) | |
1da177e4 LT |
1127 | { |
1128 | struct module *owner; | |
414fd31b | 1129 | const struct kernel_symbol *sym; |
1da177e4 LT |
1130 | const unsigned long *crc; |
1131 | ||
414fd31b | 1132 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1133 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
414fd31b TA |
1134 | /* use_module can fail due to OOM, |
1135 | or module initialization or unloading */ | |
1136 | if (sym) { | |
1da177e4 LT |
1137 | if (!check_version(sechdrs, versindex, name, mod, crc) || |
1138 | !use_module(mod, owner)) | |
414fd31b | 1139 | sym = NULL; |
1da177e4 | 1140 | } |
414fd31b | 1141 | return sym; |
1da177e4 LT |
1142 | } |
1143 | ||
1da177e4 LT |
1144 | /* |
1145 | * /sys/module/foo/sections stuff | |
1146 | * J. Corbet <corbet@lwn.net> | |
1147 | */ | |
120fc3d7 | 1148 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
a58730c4 RR |
1149 | struct module_sect_attr |
1150 | { | |
1151 | struct module_attribute mattr; | |
1152 | char *name; | |
1153 | unsigned long address; | |
1154 | }; | |
1155 | ||
1156 | struct module_sect_attrs | |
1157 | { | |
1158 | struct attribute_group grp; | |
1159 | unsigned int nsections; | |
1160 | struct module_sect_attr attrs[0]; | |
1161 | }; | |
1162 | ||
1da177e4 LT |
1163 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1164 | struct module *mod, char *buf) | |
1165 | { | |
1166 | struct module_sect_attr *sattr = | |
1167 | container_of(mattr, struct module_sect_attr, mattr); | |
1168 | return sprintf(buf, "0x%lx\n", sattr->address); | |
1169 | } | |
1170 | ||
04b1db9f IN |
1171 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1172 | { | |
a58730c4 | 1173 | unsigned int section; |
04b1db9f IN |
1174 | |
1175 | for (section = 0; section < sect_attrs->nsections; section++) | |
1176 | kfree(sect_attrs->attrs[section].name); | |
1177 | kfree(sect_attrs); | |
1178 | } | |
1179 | ||
1da177e4 LT |
1180 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1181 | char *secstrings, Elf_Shdr *sechdrs) | |
1182 | { | |
1183 | unsigned int nloaded = 0, i, size[2]; | |
1184 | struct module_sect_attrs *sect_attrs; | |
1185 | struct module_sect_attr *sattr; | |
1186 | struct attribute **gattr; | |
22a8bdeb | 1187 | |
1da177e4 LT |
1188 | /* Count loaded sections and allocate structures */ |
1189 | for (i = 0; i < nsect; i++) | |
1190 | if (sechdrs[i].sh_flags & SHF_ALLOC) | |
1191 | nloaded++; | |
1192 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1193 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1194 | sizeof(sect_attrs->grp.attrs[0])); | |
1195 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1196 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1197 | if (sect_attrs == NULL) | |
1da177e4 LT |
1198 | return; |
1199 | ||
1200 | /* Setup section attributes. */ | |
1201 | sect_attrs->grp.name = "sections"; | |
1202 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1203 | ||
04b1db9f | 1204 | sect_attrs->nsections = 0; |
1da177e4 LT |
1205 | sattr = §_attrs->attrs[0]; |
1206 | gattr = §_attrs->grp.attrs[0]; | |
1207 | for (i = 0; i < nsect; i++) { | |
1208 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) | |
1209 | continue; | |
1210 | sattr->address = sechdrs[i].sh_addr; | |
04b1db9f IN |
1211 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1212 | GFP_KERNEL); | |
1213 | if (sattr->name == NULL) | |
1214 | goto out; | |
1215 | sect_attrs->nsections++; | |
1da177e4 LT |
1216 | sattr->mattr.show = module_sect_show; |
1217 | sattr->mattr.store = NULL; | |
1218 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1219 | sattr->mattr.attr.mode = S_IRUGO; |
1220 | *(gattr++) = &(sattr++)->mattr.attr; | |
1221 | } | |
1222 | *gattr = NULL; | |
1223 | ||
1224 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1225 | goto out; | |
1226 | ||
1227 | mod->sect_attrs = sect_attrs; | |
1228 | return; | |
1229 | out: | |
04b1db9f | 1230 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1231 | } |
1232 | ||
1233 | static void remove_sect_attrs(struct module *mod) | |
1234 | { | |
1235 | if (mod->sect_attrs) { | |
1236 | sysfs_remove_group(&mod->mkobj.kobj, | |
1237 | &mod->sect_attrs->grp); | |
1238 | /* We are positive that no one is using any sect attrs | |
1239 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1240 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1241 | mod->sect_attrs = NULL; |
1242 | } | |
1243 | } | |
1244 | ||
6d760133 RM |
1245 | /* |
1246 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1247 | */ | |
1248 | ||
1249 | struct module_notes_attrs { | |
1250 | struct kobject *dir; | |
1251 | unsigned int notes; | |
1252 | struct bin_attribute attrs[0]; | |
1253 | }; | |
1254 | ||
1255 | static ssize_t module_notes_read(struct kobject *kobj, | |
1256 | struct bin_attribute *bin_attr, | |
1257 | char *buf, loff_t pos, size_t count) | |
1258 | { | |
1259 | /* | |
1260 | * The caller checked the pos and count against our size. | |
1261 | */ | |
1262 | memcpy(buf, bin_attr->private + pos, count); | |
1263 | return count; | |
1264 | } | |
1265 | ||
1266 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1267 | unsigned int i) | |
1268 | { | |
1269 | if (notes_attrs->dir) { | |
1270 | while (i-- > 0) | |
1271 | sysfs_remove_bin_file(notes_attrs->dir, | |
1272 | ¬es_attrs->attrs[i]); | |
e9432093 | 1273 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1274 | } |
1275 | kfree(notes_attrs); | |
1276 | } | |
1277 | ||
1278 | static void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1279 | char *secstrings, Elf_Shdr *sechdrs) | |
1280 | { | |
1281 | unsigned int notes, loaded, i; | |
1282 | struct module_notes_attrs *notes_attrs; | |
1283 | struct bin_attribute *nattr; | |
1284 | ||
ea6bff36 IM |
1285 | /* failed to create section attributes, so can't create notes */ |
1286 | if (!mod->sect_attrs) | |
1287 | return; | |
1288 | ||
6d760133 RM |
1289 | /* Count notes sections and allocate structures. */ |
1290 | notes = 0; | |
1291 | for (i = 0; i < nsect; i++) | |
1292 | if ((sechdrs[i].sh_flags & SHF_ALLOC) && | |
1293 | (sechdrs[i].sh_type == SHT_NOTE)) | |
1294 | ++notes; | |
1295 | ||
1296 | if (notes == 0) | |
1297 | return; | |
1298 | ||
1299 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1300 | + notes * sizeof(notes_attrs->attrs[0]), | |
1301 | GFP_KERNEL); | |
1302 | if (notes_attrs == NULL) | |
1303 | return; | |
1304 | ||
1305 | notes_attrs->notes = notes; | |
1306 | nattr = ¬es_attrs->attrs[0]; | |
1307 | for (loaded = i = 0; i < nsect; ++i) { | |
1308 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1309 | continue; | |
1310 | if (sechdrs[i].sh_type == SHT_NOTE) { | |
1311 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; | |
1312 | nattr->attr.mode = S_IRUGO; | |
1313 | nattr->size = sechdrs[i].sh_size; | |
1314 | nattr->private = (void *) sechdrs[i].sh_addr; | |
1315 | nattr->read = module_notes_read; | |
1316 | ++nattr; | |
1317 | } | |
1318 | ++loaded; | |
1319 | } | |
1320 | ||
4ff6abff | 1321 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1322 | if (!notes_attrs->dir) |
1323 | goto out; | |
1324 | ||
1325 | for (i = 0; i < notes; ++i) | |
1326 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1327 | ¬es_attrs->attrs[i])) | |
1328 | goto out; | |
1329 | ||
1330 | mod->notes_attrs = notes_attrs; | |
1331 | return; | |
1332 | ||
1333 | out: | |
1334 | free_notes_attrs(notes_attrs, i); | |
1335 | } | |
1336 | ||
1337 | static void remove_notes_attrs(struct module *mod) | |
1338 | { | |
1339 | if (mod->notes_attrs) | |
1340 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1341 | } | |
1342 | ||
1da177e4 | 1343 | #else |
04b1db9f | 1344 | |
1da177e4 LT |
1345 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1346 | char *sectstrings, Elf_Shdr *sechdrs) | |
1347 | { | |
1348 | } | |
1349 | ||
1350 | static inline void remove_sect_attrs(struct module *mod) | |
1351 | { | |
1352 | } | |
6d760133 RM |
1353 | |
1354 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1355 | char *sectstrings, Elf_Shdr *sechdrs) | |
1356 | { | |
1357 | } | |
1358 | ||
1359 | static inline void remove_notes_attrs(struct module *mod) | |
1360 | { | |
1361 | } | |
120fc3d7 | 1362 | #endif |
1da177e4 | 1363 | |
ef665c1a RD |
1364 | #ifdef CONFIG_SYSFS |
1365 | int module_add_modinfo_attrs(struct module *mod) | |
c988d2b2 MD |
1366 | { |
1367 | struct module_attribute *attr; | |
03e88ae1 | 1368 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1369 | int error = 0; |
1370 | int i; | |
1371 | ||
03e88ae1 GKH |
1372 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1373 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1374 | GFP_KERNEL); | |
1375 | if (!mod->modinfo_attrs) | |
1376 | return -ENOMEM; | |
1377 | ||
1378 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1379 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1380 | if (!attr->test || | |
03e88ae1 GKH |
1381 | (attr->test && attr->test(mod))) { |
1382 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
03e88ae1 GKH |
1383 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1384 | ++temp_attr; | |
1385 | } | |
c988d2b2 MD |
1386 | } |
1387 | return error; | |
1388 | } | |
1389 | ||
ef665c1a | 1390 | void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1391 | { |
1392 | struct module_attribute *attr; | |
1393 | int i; | |
1394 | ||
03e88ae1 GKH |
1395 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1396 | /* pick a field to test for end of list */ | |
1397 | if (!attr->attr.name) | |
1398 | break; | |
c988d2b2 | 1399 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1400 | if (attr->free) |
1401 | attr->free(mod); | |
c988d2b2 | 1402 | } |
03e88ae1 | 1403 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1404 | } |
1da177e4 | 1405 | |
ef665c1a | 1406 | int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1407 | { |
1408 | int err; | |
6494a93d | 1409 | struct kobject *kobj; |
1da177e4 | 1410 | |
823bccfc GKH |
1411 | if (!module_sysfs_initialized) { |
1412 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1413 | mod->name); |
1414 | err = -EINVAL; | |
1415 | goto out; | |
1416 | } | |
6494a93d GKH |
1417 | |
1418 | kobj = kset_find_obj(module_kset, mod->name); | |
1419 | if (kobj) { | |
1420 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1421 | kobject_put(kobj); | |
1422 | err = -EINVAL; | |
1423 | goto out; | |
1424 | } | |
1425 | ||
1da177e4 | 1426 | mod->mkobj.mod = mod; |
e17e0f51 | 1427 | |
ac3c8141 GKH |
1428 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1429 | mod->mkobj.kobj.kset = module_kset; | |
1430 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1431 | "%s", mod->name); | |
1432 | if (err) | |
1433 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1434 | |
97c146ef | 1435 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1436 | out: |
1437 | return err; | |
1438 | } | |
1439 | ||
ef665c1a | 1440 | int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1441 | struct kernel_param *kparam, |
1442 | unsigned int num_params) | |
1443 | { | |
1444 | int err; | |
1445 | ||
4ff6abff | 1446 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1447 | if (!mod->holders_dir) { |
1448 | err = -ENOMEM; | |
270a6c4c | 1449 | goto out_unreg; |
240936e1 | 1450 | } |
270a6c4c | 1451 | |
1da177e4 LT |
1452 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1453 | if (err) | |
270a6c4c | 1454 | goto out_unreg_holders; |
1da177e4 | 1455 | |
c988d2b2 MD |
1456 | err = module_add_modinfo_attrs(mod); |
1457 | if (err) | |
e17e0f51 | 1458 | goto out_unreg_param; |
c988d2b2 | 1459 | |
e17e0f51 | 1460 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1461 | return 0; |
1462 | ||
e17e0f51 KS |
1463 | out_unreg_param: |
1464 | module_param_sysfs_remove(mod); | |
270a6c4c | 1465 | out_unreg_holders: |
78a2d906 | 1466 | kobject_put(mod->holders_dir); |
270a6c4c | 1467 | out_unreg: |
e17e0f51 | 1468 | kobject_put(&mod->mkobj.kobj); |
1da177e4 LT |
1469 | return err; |
1470 | } | |
34e4e2fe DL |
1471 | |
1472 | static void mod_sysfs_fini(struct module *mod) | |
1473 | { | |
1474 | kobject_put(&mod->mkobj.kobj); | |
1475 | } | |
1476 | ||
1477 | #else /* CONFIG_SYSFS */ | |
1478 | ||
1479 | static void mod_sysfs_fini(struct module *mod) | |
1480 | { | |
1481 | } | |
1482 | ||
1483 | #endif /* CONFIG_SYSFS */ | |
1da177e4 LT |
1484 | |
1485 | static void mod_kobject_remove(struct module *mod) | |
1486 | { | |
c988d2b2 | 1487 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1488 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1489 | kobject_put(mod->mkobj.drivers_dir); |
1490 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1491 | mod_sysfs_fini(mod); |
1da177e4 LT |
1492 | } |
1493 | ||
1494 | /* | |
1495 | * unlink the module with the whole machine is stopped with interrupts off | |
1496 | * - this defends against kallsyms not taking locks | |
1497 | */ | |
1498 | static int __unlink_module(void *_mod) | |
1499 | { | |
1500 | struct module *mod = _mod; | |
1501 | list_del(&mod->list); | |
1502 | return 0; | |
1503 | } | |
1504 | ||
02a3e59a | 1505 | /* Free a module, remove from lists, etc (must hold module_mutex). */ |
1da177e4 LT |
1506 | static void free_module(struct module *mod) |
1507 | { | |
7ead8b83 LZ |
1508 | trace_module_free(mod); |
1509 | ||
1da177e4 | 1510 | /* Delete from various lists */ |
9b1a4d38 | 1511 | stop_machine(__unlink_module, mod, NULL); |
6d760133 | 1512 | remove_notes_attrs(mod); |
1da177e4 LT |
1513 | remove_sect_attrs(mod); |
1514 | mod_kobject_remove(mod); | |
1515 | ||
1516 | /* Arch-specific cleanup. */ | |
1517 | module_arch_cleanup(mod); | |
1518 | ||
1519 | /* Module unload stuff */ | |
1520 | module_unload_free(mod); | |
1521 | ||
e180a6b7 RR |
1522 | /* Free any allocated parameters. */ |
1523 | destroy_params(mod->kp, mod->num_kp); | |
1524 | ||
1da177e4 LT |
1525 | /* This may be NULL, but that's OK */ |
1526 | module_free(mod, mod->module_init); | |
1527 | kfree(mod->args); | |
1528 | if (mod->percpu) | |
1529 | percpu_modfree(mod->percpu); | |
720eba31 ED |
1530 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
1531 | if (mod->refptr) | |
1532 | percpu_modfree(mod->refptr); | |
1533 | #endif | |
fbb9ce95 IM |
1534 | /* Free lock-classes: */ |
1535 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1536 | ||
1da177e4 LT |
1537 | /* Finally, free the core (containing the module structure) */ |
1538 | module_free(mod, mod->module_core); | |
eb8cdec4 BS |
1539 | |
1540 | #ifdef CONFIG_MPU | |
1541 | update_protections(current->mm); | |
1542 | #endif | |
1da177e4 LT |
1543 | } |
1544 | ||
1545 | void *__symbol_get(const char *symbol) | |
1546 | { | |
1547 | struct module *owner; | |
414fd31b | 1548 | const struct kernel_symbol *sym; |
1da177e4 | 1549 | |
24da1cbf | 1550 | preempt_disable(); |
414fd31b TA |
1551 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1552 | if (sym && strong_try_module_get(owner)) | |
1553 | sym = NULL; | |
24da1cbf | 1554 | preempt_enable(); |
1da177e4 | 1555 | |
414fd31b | 1556 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1557 | } |
1558 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1559 | ||
eea8b54d AN |
1560 | /* |
1561 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1562 | * in the kernel or in some other module's exported symbol table. |
eea8b54d AN |
1563 | */ |
1564 | static int verify_export_symbols(struct module *mod) | |
1565 | { | |
b211104d | 1566 | unsigned int i; |
eea8b54d | 1567 | struct module *owner; |
b211104d RR |
1568 | const struct kernel_symbol *s; |
1569 | struct { | |
1570 | const struct kernel_symbol *sym; | |
1571 | unsigned int num; | |
1572 | } arr[] = { | |
1573 | { mod->syms, mod->num_syms }, | |
1574 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1575 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1576 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1577 | { mod->unused_syms, mod->num_unused_syms }, |
1578 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1579 | #endif |
b211104d | 1580 | }; |
eea8b54d | 1581 | |
b211104d RR |
1582 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1583 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
414fd31b | 1584 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d RR |
1585 | printk(KERN_ERR |
1586 | "%s: exports duplicate symbol %s" | |
1587 | " (owned by %s)\n", | |
1588 | mod->name, s->name, module_name(owner)); | |
1589 | return -ENOEXEC; | |
1590 | } | |
eea8b54d | 1591 | } |
b211104d RR |
1592 | } |
1593 | return 0; | |
eea8b54d AN |
1594 | } |
1595 | ||
9a4b9708 | 1596 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4 LT |
1597 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1598 | unsigned int symindex, | |
1599 | const char *strtab, | |
1600 | unsigned int versindex, | |
1601 | unsigned int pcpuindex, | |
1602 | struct module *mod) | |
1603 | { | |
1604 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1605 | unsigned long secbase; | |
1606 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1607 | int ret = 0; | |
414fd31b | 1608 | const struct kernel_symbol *ksym; |
1da177e4 LT |
1609 | |
1610 | for (i = 1; i < n; i++) { | |
1611 | switch (sym[i].st_shndx) { | |
1612 | case SHN_COMMON: | |
1613 | /* We compiled with -fno-common. These are not | |
1614 | supposed to happen. */ | |
1615 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1616 | printk("%s: please compile with -fno-common\n", | |
1617 | mod->name); | |
1618 | ret = -ENOEXEC; | |
1619 | break; | |
1620 | ||
1621 | case SHN_ABS: | |
1622 | /* Don't need to do anything */ | |
1623 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1624 | (long)sym[i].st_value); | |
1625 | break; | |
1626 | ||
1627 | case SHN_UNDEF: | |
414fd31b TA |
1628 | ksym = resolve_symbol(sechdrs, versindex, |
1629 | strtab + sym[i].st_name, mod); | |
1da177e4 | 1630 | /* Ok if resolved. */ |
414fd31b TA |
1631 | if (ksym) { |
1632 | sym[i].st_value = ksym->value; | |
1da177e4 | 1633 | break; |
414fd31b TA |
1634 | } |
1635 | ||
1da177e4 LT |
1636 | /* Ok if weak. */ |
1637 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) | |
1638 | break; | |
1639 | ||
1640 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
1641 | mod->name, strtab + sym[i].st_name); | |
1642 | ret = -ENOENT; | |
1643 | break; | |
1644 | ||
1645 | default: | |
1646 | /* Divert to percpu allocation if a percpu var. */ | |
1647 | if (sym[i].st_shndx == pcpuindex) | |
1648 | secbase = (unsigned long)mod->percpu; | |
1649 | else | |
1650 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1651 | sym[i].st_value += secbase; | |
1652 | break; | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | return ret; | |
1657 | } | |
1658 | ||
088af9a6 HD |
1659 | /* Additional bytes needed by arch in front of individual sections */ |
1660 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1661 | unsigned int section) | |
1662 | { | |
1663 | /* default implementation just returns zero */ | |
1664 | return 0; | |
1665 | } | |
1666 | ||
1da177e4 | 1667 | /* Update size with this section: return offset. */ |
088af9a6 HD |
1668 | static long get_offset(struct module *mod, unsigned int *size, |
1669 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
1670 | { |
1671 | long ret; | |
1672 | ||
088af9a6 | 1673 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1674 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1675 | *size = ret + sechdr->sh_size; | |
1676 | return ret; | |
1677 | } | |
1678 | ||
1679 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1680 | might -- code, read-only data, read-write data, small data. Tally | |
1681 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1682 | belongs in init. */ | |
1683 | static void layout_sections(struct module *mod, | |
1684 | const Elf_Ehdr *hdr, | |
1685 | Elf_Shdr *sechdrs, | |
1686 | const char *secstrings) | |
1687 | { | |
1688 | static unsigned long const masks[][2] = { | |
1689 | /* NOTE: all executable code must be the first section | |
1690 | * in this array; otherwise modify the text_size | |
1691 | * finder in the two loops below */ | |
1692 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1693 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1694 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1695 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1696 | }; | |
1697 | unsigned int m, i; | |
1698 | ||
1699 | for (i = 0; i < hdr->e_shnum; i++) | |
1700 | sechdrs[i].sh_entsize = ~0UL; | |
1701 | ||
1702 | DEBUGP("Core section allocation order:\n"); | |
1703 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1704 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1705 | Elf_Shdr *s = &sechdrs[i]; | |
1706 | ||
1707 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1708 | || (s->sh_flags & masks[m][1]) | |
1709 | || s->sh_entsize != ~0UL | |
49502677 | 1710 | || strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1711 | continue; |
088af9a6 | 1712 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
1da177e4 LT |
1713 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
1714 | } | |
1715 | if (m == 0) | |
1716 | mod->core_text_size = mod->core_size; | |
1717 | } | |
1718 | ||
1719 | DEBUGP("Init section allocation order:\n"); | |
1720 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1721 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1722 | Elf_Shdr *s = &sechdrs[i]; | |
1723 | ||
1724 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1725 | || (s->sh_flags & masks[m][1]) | |
1726 | || s->sh_entsize != ~0UL | |
49502677 | 1727 | || !strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1728 | continue; |
088af9a6 | 1729 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 LT |
1730 | | INIT_OFFSET_MASK); |
1731 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1732 | } | |
1733 | if (m == 0) | |
1734 | mod->init_text_size = mod->init_size; | |
1735 | } | |
1736 | } | |
1737 | ||
1da177e4 LT |
1738 | static void set_license(struct module *mod, const char *license) |
1739 | { | |
1740 | if (!license) | |
1741 | license = "unspecified"; | |
1742 | ||
fa3ba2e8 | 1743 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1744 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 1745 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1746 | "kernel.\n", mod->name, license); |
1747 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1748 | } |
1749 | } | |
1750 | ||
1751 | /* Parse tag=value strings from .modinfo section */ | |
1752 | static char *next_string(char *string, unsigned long *secsize) | |
1753 | { | |
1754 | /* Skip non-zero chars */ | |
1755 | while (string[0]) { | |
1756 | string++; | |
1757 | if ((*secsize)-- <= 1) | |
1758 | return NULL; | |
1759 | } | |
1760 | ||
1761 | /* Skip any zero padding. */ | |
1762 | while (!string[0]) { | |
1763 | string++; | |
1764 | if ((*secsize)-- <= 1) | |
1765 | return NULL; | |
1766 | } | |
1767 | return string; | |
1768 | } | |
1769 | ||
1770 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1771 | unsigned int info, | |
1772 | const char *tag) | |
1773 | { | |
1774 | char *p; | |
1775 | unsigned int taglen = strlen(tag); | |
1776 | unsigned long size = sechdrs[info].sh_size; | |
1777 | ||
1778 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1779 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1780 | return p + taglen + 1; | |
1781 | } | |
1782 | return NULL; | |
1783 | } | |
1784 | ||
c988d2b2 MD |
1785 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1786 | unsigned int infoindex) | |
1787 | { | |
1788 | struct module_attribute *attr; | |
1789 | int i; | |
1790 | ||
1791 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1792 | if (attr->setup) | |
1793 | attr->setup(mod, | |
1794 | get_modinfo(sechdrs, | |
1795 | infoindex, | |
1796 | attr->attr.name)); | |
1797 | } | |
1798 | } | |
c988d2b2 | 1799 | |
a263f776 RR |
1800 | static void free_modinfo(struct module *mod) |
1801 | { | |
1802 | struct module_attribute *attr; | |
1803 | int i; | |
1804 | ||
1805 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1806 | if (attr->free) | |
1807 | attr->free(mod); | |
1808 | } | |
1809 | } | |
1810 | ||
1da177e4 | 1811 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
1812 | |
1813 | /* lookup symbol in given range of kernel_symbols */ | |
1814 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
1815 | const struct kernel_symbol *start, | |
1816 | const struct kernel_symbol *stop) | |
1817 | { | |
1818 | const struct kernel_symbol *ks = start; | |
1819 | for (; ks < stop; ks++) | |
1820 | if (strcmp(ks->name, name) == 0) | |
1821 | return ks; | |
1822 | return NULL; | |
1823 | } | |
1824 | ||
ca4787b7 TA |
1825 | static int is_exported(const char *name, unsigned long value, |
1826 | const struct module *mod) | |
1da177e4 | 1827 | { |
ca4787b7 TA |
1828 | const struct kernel_symbol *ks; |
1829 | if (!mod) | |
1830 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 1831 | else |
ca4787b7 TA |
1832 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
1833 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
1834 | } |
1835 | ||
1836 | /* As per nm */ | |
1837 | static char elf_type(const Elf_Sym *sym, | |
1838 | Elf_Shdr *sechdrs, | |
1839 | const char *secstrings, | |
1840 | struct module *mod) | |
1841 | { | |
1842 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1843 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1844 | return 'v'; | |
1845 | else | |
1846 | return 'w'; | |
1847 | } | |
1848 | if (sym->st_shndx == SHN_UNDEF) | |
1849 | return 'U'; | |
1850 | if (sym->st_shndx == SHN_ABS) | |
1851 | return 'a'; | |
1852 | if (sym->st_shndx >= SHN_LORESERVE) | |
1853 | return '?'; | |
1854 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1855 | return 't'; | |
1856 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1857 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1858 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1859 | return 'r'; | |
1860 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1861 | return 'g'; | |
1862 | else | |
1863 | return 'd'; | |
1864 | } | |
1865 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1866 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1867 | return 's'; | |
1868 | else | |
1869 | return 'b'; | |
1870 | } | |
49502677 | 1871 | if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug")) |
1da177e4 LT |
1872 | return 'n'; |
1873 | return '?'; | |
1874 | } | |
1875 | ||
4a496226 JB |
1876 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
1877 | unsigned int shnum) | |
1878 | { | |
1879 | const Elf_Shdr *sec; | |
1880 | ||
1881 | if (src->st_shndx == SHN_UNDEF | |
1882 | || src->st_shndx >= shnum | |
1883 | || !src->st_name) | |
1884 | return false; | |
1885 | ||
1886 | sec = sechdrs + src->st_shndx; | |
1887 | if (!(sec->sh_flags & SHF_ALLOC) | |
1888 | #ifndef CONFIG_KALLSYMS_ALL | |
1889 | || !(sec->sh_flags & SHF_EXECINSTR) | |
1890 | #endif | |
1891 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
1892 | return false; | |
1893 | ||
1894 | return true; | |
1895 | } | |
1896 | ||
1897 | static unsigned long layout_symtab(struct module *mod, | |
1898 | Elf_Shdr *sechdrs, | |
1899 | unsigned int symindex, | |
554bdfe5 | 1900 | unsigned int strindex, |
4a496226 | 1901 | const Elf_Ehdr *hdr, |
554bdfe5 JB |
1902 | const char *secstrings, |
1903 | unsigned long *pstroffs, | |
1904 | unsigned long *strmap) | |
4a496226 JB |
1905 | { |
1906 | unsigned long symoffs; | |
1907 | Elf_Shdr *symsect = sechdrs + symindex; | |
554bdfe5 | 1908 | Elf_Shdr *strsect = sechdrs + strindex; |
4a496226 | 1909 | const Elf_Sym *src; |
554bdfe5 | 1910 | const char *strtab; |
4a496226 JB |
1911 | unsigned int i, nsrc, ndst; |
1912 | ||
1913 | /* Put symbol section at end of init part of module. */ | |
1914 | symsect->sh_flags |= SHF_ALLOC; | |
1915 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
1916 | symindex) | INIT_OFFSET_MASK; | |
1917 | DEBUGP("\t%s\n", secstrings + symsect->sh_name); | |
1918 | ||
1919 | src = (void *)hdr + symsect->sh_offset; | |
1920 | nsrc = symsect->sh_size / sizeof(*src); | |
554bdfe5 | 1921 | strtab = (void *)hdr + strsect->sh_offset; |
4a496226 | 1922 | for (ndst = i = 1; i < nsrc; ++i, ++src) |
554bdfe5 JB |
1923 | if (is_core_symbol(src, sechdrs, hdr->e_shnum)) { |
1924 | unsigned int j = src->st_name; | |
1925 | ||
1926 | while(!__test_and_set_bit(j, strmap) && strtab[j]) | |
1927 | ++j; | |
4a496226 | 1928 | ++ndst; |
554bdfe5 | 1929 | } |
4a496226 JB |
1930 | |
1931 | /* Append room for core symbols at end of core part. */ | |
1932 | symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); | |
1933 | mod->core_size = symoffs + ndst * sizeof(Elf_Sym); | |
1934 | ||
554bdfe5 JB |
1935 | /* Put string table section at end of init part of module. */ |
1936 | strsect->sh_flags |= SHF_ALLOC; | |
1937 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
1938 | strindex) | INIT_OFFSET_MASK; | |
1939 | DEBUGP("\t%s\n", secstrings + strsect->sh_name); | |
1940 | ||
1941 | /* Append room for core symbols' strings at end of core part. */ | |
1942 | *pstroffs = mod->core_size; | |
1943 | __set_bit(0, strmap); | |
1944 | mod->core_size += bitmap_weight(strmap, strsect->sh_size); | |
1945 | ||
4a496226 JB |
1946 | return symoffs; |
1947 | } | |
1948 | ||
1da177e4 LT |
1949 | static void add_kallsyms(struct module *mod, |
1950 | Elf_Shdr *sechdrs, | |
4a496226 | 1951 | unsigned int shnum, |
1da177e4 LT |
1952 | unsigned int symindex, |
1953 | unsigned int strindex, | |
4a496226 | 1954 | unsigned long symoffs, |
554bdfe5 JB |
1955 | unsigned long stroffs, |
1956 | const char *secstrings, | |
1957 | unsigned long *strmap) | |
1da177e4 | 1958 | { |
4a496226 JB |
1959 | unsigned int i, ndst; |
1960 | const Elf_Sym *src; | |
1961 | Elf_Sym *dst; | |
554bdfe5 | 1962 | char *s; |
1da177e4 LT |
1963 | |
1964 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
1965 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1966 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
1967 | ||
1968 | /* Set types up while we still have access to sections. */ | |
1969 | for (i = 0; i < mod->num_symtab; i++) | |
1970 | mod->symtab[i].st_info | |
1971 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
4a496226 JB |
1972 | |
1973 | mod->core_symtab = dst = mod->module_core + symoffs; | |
1974 | src = mod->symtab; | |
1975 | *dst = *src; | |
1976 | for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { | |
1977 | if (!is_core_symbol(src, sechdrs, shnum)) | |
1978 | continue; | |
1979 | dst[ndst] = *src; | |
554bdfe5 | 1980 | dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name); |
4a496226 JB |
1981 | ++ndst; |
1982 | } | |
1983 | mod->core_num_syms = ndst; | |
554bdfe5 JB |
1984 | |
1985 | mod->core_strtab = s = mod->module_core + stroffs; | |
1986 | for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i) | |
1987 | if (test_bit(i, strmap)) | |
1988 | *++s = mod->strtab[i]; | |
1da177e4 LT |
1989 | } |
1990 | #else | |
4a496226 JB |
1991 | static inline unsigned long layout_symtab(struct module *mod, |
1992 | Elf_Shdr *sechdrs, | |
1993 | unsigned int symindex, | |
554bdfe5 | 1994 | unsigned int strindex, |
4a496226 | 1995 | const Elf_Hdr *hdr, |
554bdfe5 JB |
1996 | const char *secstrings, |
1997 | unsigned long *pstroffs, | |
1998 | unsigned long *strmap) | |
4a496226 JB |
1999 | { |
2000 | } | |
1da177e4 LT |
2001 | static inline void add_kallsyms(struct module *mod, |
2002 | Elf_Shdr *sechdrs, | |
4a496226 | 2003 | unsigned int shnum, |
1da177e4 LT |
2004 | unsigned int symindex, |
2005 | unsigned int strindex, | |
4a496226 | 2006 | unsigned long symoffs, |
554bdfe5 JB |
2007 | unsigned long stroffs, |
2008 | const char *secstrings, | |
2009 | const unsigned long *strmap) | |
1da177e4 LT |
2010 | { |
2011 | } | |
2012 | #endif /* CONFIG_KALLSYMS */ | |
2013 | ||
e9d376f0 | 2014 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2015 | { |
e9d376f0 JB |
2016 | #ifdef CONFIG_DYNAMIC_DEBUG |
2017 | if (ddebug_add_module(debug, num, debug->modname)) | |
2018 | printk(KERN_ERR "dynamic debug error adding module: %s\n", | |
2019 | debug->modname); | |
2020 | #endif | |
5e458cc0 | 2021 | } |
346e15be | 2022 | |
3a642e99 RR |
2023 | static void *module_alloc_update_bounds(unsigned long size) |
2024 | { | |
2025 | void *ret = module_alloc(size); | |
2026 | ||
2027 | if (ret) { | |
2028 | /* Update module bounds. */ | |
2029 | if ((unsigned long)ret < module_addr_min) | |
2030 | module_addr_min = (unsigned long)ret; | |
2031 | if ((unsigned long)ret + size > module_addr_max) | |
2032 | module_addr_max = (unsigned long)ret + size; | |
2033 | } | |
2034 | return ret; | |
2035 | } | |
2036 | ||
4f2294b6 CM |
2037 | #ifdef CONFIG_DEBUG_KMEMLEAK |
2038 | static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
2039 | Elf_Shdr *sechdrs, char *secstrings) | |
2040 | { | |
2041 | unsigned int i; | |
2042 | ||
2043 | /* only scan the sections containing data */ | |
2044 | kmemleak_scan_area(mod->module_core, (unsigned long)mod - | |
2045 | (unsigned long)mod->module_core, | |
2046 | sizeof(struct module), GFP_KERNEL); | |
2047 | ||
2048 | for (i = 1; i < hdr->e_shnum; i++) { | |
2049 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2050 | continue; | |
2051 | if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0 | |
2052 | && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0) | |
2053 | continue; | |
2054 | ||
2055 | kmemleak_scan_area(mod->module_core, sechdrs[i].sh_addr - | |
2056 | (unsigned long)mod->module_core, | |
2057 | sechdrs[i].sh_size, GFP_KERNEL); | |
2058 | } | |
2059 | } | |
2060 | #else | |
2061 | static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
2062 | Elf_Shdr *sechdrs, char *secstrings) | |
2063 | { | |
2064 | } | |
2065 | #endif | |
2066 | ||
1da177e4 LT |
2067 | /* Allocate and load the module: note that size of section 0 is always |
2068 | zero, and we rely on this for optional sections. */ | |
ffb4ba76 | 2069 | static noinline struct module *load_module(void __user *umod, |
1da177e4 LT |
2070 | unsigned long len, |
2071 | const char __user *uargs) | |
2072 | { | |
2073 | Elf_Ehdr *hdr; | |
2074 | Elf_Shdr *sechdrs; | |
2075 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
061b1bd3 | 2076 | char *staging; |
84860f99 AM |
2077 | unsigned int i; |
2078 | unsigned int symindex = 0; | |
2079 | unsigned int strindex = 0; | |
5e458cc0 | 2080 | unsigned int modindex, versindex, infoindex, pcpuindex; |
1da177e4 LT |
2081 | struct module *mod; |
2082 | long err = 0; | |
2083 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ | |
4a496226 | 2084 | #ifdef CONFIG_KALLSYMS |
554bdfe5 | 2085 | unsigned long symoffs, stroffs, *strmap; |
4a496226 | 2086 | #endif |
378bac82 | 2087 | mm_segment_t old_fs; |
1da177e4 LT |
2088 | |
2089 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
2090 | umod, len, uargs); | |
2091 | if (len < sizeof(*hdr)) | |
2092 | return ERR_PTR(-ENOEXEC); | |
2093 | ||
2094 | /* Suck in entire file: we'll want most of it. */ | |
2095 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
2096 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
2097 | return ERR_PTR(-ENOMEM); | |
9e01892c | 2098 | |
1da177e4 LT |
2099 | if (copy_from_user(hdr, umod, len) != 0) { |
2100 | err = -EFAULT; | |
2101 | goto free_hdr; | |
2102 | } | |
2103 | ||
2104 | /* Sanity checks against insmoding binaries or wrong arch, | |
2105 | weird elf version */ | |
c4ea6fcf | 2106 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
1da177e4 LT |
2107 | || hdr->e_type != ET_REL |
2108 | || !elf_check_arch(hdr) | |
2109 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
2110 | err = -ENOEXEC; | |
2111 | goto free_hdr; | |
2112 | } | |
2113 | ||
2114 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
2115 | goto truncated; | |
2116 | ||
2117 | /* Convenience variables */ | |
2118 | sechdrs = (void *)hdr + hdr->e_shoff; | |
2119 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
2120 | sechdrs[0].sh_addr = 0; | |
2121 | ||
2122 | for (i = 1; i < hdr->e_shnum; i++) { | |
2123 | if (sechdrs[i].sh_type != SHT_NOBITS | |
2124 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
2125 | goto truncated; | |
2126 | ||
2127 | /* Mark all sections sh_addr with their address in the | |
2128 | temporary image. */ | |
2129 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
2130 | ||
2131 | /* Internal symbols and strings. */ | |
2132 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
2133 | symindex = i; | |
2134 | strindex = sechdrs[i].sh_link; | |
2135 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
2136 | } | |
2137 | #ifndef CONFIG_MODULE_UNLOAD | |
2138 | /* Don't load .exit sections */ | |
49502677 | 2139 | if (strstarts(secstrings+sechdrs[i].sh_name, ".exit")) |
1da177e4 LT |
2140 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2141 | #endif | |
2142 | } | |
2143 | ||
2144 | modindex = find_sec(hdr, sechdrs, secstrings, | |
2145 | ".gnu.linkonce.this_module"); | |
2146 | if (!modindex) { | |
2147 | printk(KERN_WARNING "No module found in object\n"); | |
2148 | err = -ENOEXEC; | |
2149 | goto free_hdr; | |
2150 | } | |
5e458cc0 | 2151 | /* This is temporary: point mod into copy of data. */ |
1da177e4 LT |
2152 | mod = (void *)sechdrs[modindex].sh_addr; |
2153 | ||
2154 | if (symindex == 0) { | |
2155 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
2156 | mod->name); | |
2157 | err = -ENOEXEC; | |
2158 | goto free_hdr; | |
2159 | } | |
2160 | ||
1da177e4 LT |
2161 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); |
2162 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
2163 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
2164 | ||
ea01e798 | 2165 | /* Don't keep modinfo and version sections. */ |
1da177e4 | 2166 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
ea01e798 | 2167 | sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
2168 | |
2169 | /* Check module struct version now, before we try to use module. */ | |
2170 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
2171 | err = -ENOEXEC; | |
2172 | goto free_hdr; | |
2173 | } | |
2174 | ||
2175 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
2176 | /* This is allowed: modprobe --force will invalidate it. */ | |
2177 | if (!modmagic) { | |
c6e665c8 | 2178 | err = try_to_force_load(mod, "bad vermagic"); |
826e4506 LT |
2179 | if (err) |
2180 | goto free_hdr; | |
91e37a79 | 2181 | } else if (!same_magic(modmagic, vermagic, versindex)) { |
1da177e4 LT |
2182 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
2183 | mod->name, modmagic, vermagic); | |
2184 | err = -ENOEXEC; | |
2185 | goto free_hdr; | |
2186 | } | |
2187 | ||
061b1bd3 GKH |
2188 | staging = get_modinfo(sechdrs, infoindex, "staging"); |
2189 | if (staging) { | |
2190 | add_taint_module(mod, TAINT_CRAP); | |
2191 | printk(KERN_WARNING "%s: module is from the staging directory," | |
2192 | " the quality is unknown, you have been warned.\n", | |
2193 | mod->name); | |
2194 | } | |
2195 | ||
1da177e4 | 2196 | /* Now copy in args */ |
24277dda DA |
2197 | args = strndup_user(uargs, ~0UL >> 1); |
2198 | if (IS_ERR(args)) { | |
2199 | err = PTR_ERR(args); | |
1da177e4 LT |
2200 | goto free_hdr; |
2201 | } | |
8e08b756 | 2202 | |
554bdfe5 JB |
2203 | strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size) |
2204 | * sizeof(long), GFP_KERNEL); | |
2205 | if (!strmap) { | |
2206 | err = -ENOMEM; | |
2207 | goto free_mod; | |
2208 | } | |
2209 | ||
1da177e4 LT |
2210 | if (find_module(mod->name)) { |
2211 | err = -EEXIST; | |
2212 | goto free_mod; | |
2213 | } | |
2214 | ||
2215 | mod->state = MODULE_STATE_COMING; | |
2216 | ||
2217 | /* Allow arches to frob section contents and sizes. */ | |
2218 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
2219 | if (err < 0) | |
2220 | goto free_mod; | |
2221 | ||
2222 | if (pcpuindex) { | |
2223 | /* We have a special allocation for this section. */ | |
2224 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, | |
842bbaaa RR |
2225 | sechdrs[pcpuindex].sh_addralign, |
2226 | mod->name); | |
1da177e4 LT |
2227 | if (!percpu) { |
2228 | err = -ENOMEM; | |
6e2b7574 | 2229 | goto free_mod; |
1da177e4 LT |
2230 | } |
2231 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2232 | mod->percpu = percpu; | |
2233 | } | |
2234 | ||
2235 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2236 | this is done generically; there doesn't appear to be any | |
2237 | special cases for the architectures. */ | |
2238 | layout_sections(mod, hdr, sechdrs, secstrings); | |
554bdfe5 JB |
2239 | symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr, |
2240 | secstrings, &stroffs, strmap); | |
1da177e4 LT |
2241 | |
2242 | /* Do the allocs. */ | |
3a642e99 | 2243 | ptr = module_alloc_update_bounds(mod->core_size); |
4f2294b6 CM |
2244 | /* |
2245 | * The pointer to this block is stored in the module structure | |
2246 | * which is inside the block. Just mark it as not being a | |
2247 | * leak. | |
2248 | */ | |
2249 | kmemleak_not_leak(ptr); | |
1da177e4 LT |
2250 | if (!ptr) { |
2251 | err = -ENOMEM; | |
2252 | goto free_percpu; | |
2253 | } | |
2254 | memset(ptr, 0, mod->core_size); | |
2255 | mod->module_core = ptr; | |
2256 | ||
3a642e99 | 2257 | ptr = module_alloc_update_bounds(mod->init_size); |
4f2294b6 CM |
2258 | /* |
2259 | * The pointer to this block is stored in the module structure | |
2260 | * which is inside the block. This block doesn't need to be | |
2261 | * scanned as it contains data and code that will be freed | |
2262 | * after the module is initialized. | |
2263 | */ | |
2264 | kmemleak_ignore(ptr); | |
1da177e4 LT |
2265 | if (!ptr && mod->init_size) { |
2266 | err = -ENOMEM; | |
2267 | goto free_core; | |
2268 | } | |
2269 | memset(ptr, 0, mod->init_size); | |
2270 | mod->module_init = ptr; | |
2271 | ||
2272 | /* Transfer each section which specifies SHF_ALLOC */ | |
2273 | DEBUGP("final section addresses:\n"); | |
2274 | for (i = 0; i < hdr->e_shnum; i++) { | |
2275 | void *dest; | |
2276 | ||
2277 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2278 | continue; | |
2279 | ||
2280 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
2281 | dest = mod->module_init | |
2282 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
2283 | else | |
2284 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
2285 | ||
2286 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
2287 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
2288 | sechdrs[i].sh_size); | |
2289 | /* Update sh_addr to point to copy in image. */ | |
2290 | sechdrs[i].sh_addr = (unsigned long)dest; | |
2291 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
2292 | } | |
2293 | /* Module has been moved. */ | |
2294 | mod = (void *)sechdrs[modindex].sh_addr; | |
4f2294b6 | 2295 | kmemleak_load_module(mod, hdr, sechdrs, secstrings); |
1da177e4 | 2296 | |
6e2b7574 MH |
2297 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
2298 | mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t), | |
2299 | mod->name); | |
2300 | if (!mod->refptr) { | |
2301 | err = -ENOMEM; | |
2302 | goto free_init; | |
2303 | } | |
2304 | #endif | |
1da177e4 LT |
2305 | /* Now we've moved module, initialize linked lists, etc. */ |
2306 | module_unload_init(mod); | |
2307 | ||
97c146ef | 2308 | /* add kobject, so we can reference it. */ |
d58ae678 AM |
2309 | err = mod_sysfs_init(mod); |
2310 | if (err) | |
97c146ef | 2311 | goto free_unload; |
270a6c4c | 2312 | |
1da177e4 LT |
2313 | /* Set up license info based on the info section */ |
2314 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
2315 | ||
9b37ccfc PR |
2316 | /* |
2317 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2318 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2319 | * using GPL-only symbols it needs. | |
2320 | */ | |
fa3ba2e8 | 2321 | if (strcmp(mod->name, "ndiswrapper") == 0) |
9b37ccfc PR |
2322 | add_taint(TAINT_PROPRIETARY_MODULE); |
2323 | ||
2324 | /* driverloader was caught wrongly pretending to be under GPL */ | |
fa3ba2e8 FM |
2325 | if (strcmp(mod->name, "driverloader") == 0) |
2326 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
9841d61d | 2327 | |
c988d2b2 MD |
2328 | /* Set up MODINFO_ATTR fields */ |
2329 | setup_modinfo(mod, sechdrs, infoindex); | |
c988d2b2 | 2330 | |
1da177e4 LT |
2331 | /* Fix up syms, so that st_value is a pointer to location. */ |
2332 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
2333 | mod); | |
2334 | if (err < 0) | |
2335 | goto cleanup; | |
2336 | ||
5e458cc0 RR |
2337 | /* Now we've got everything in the final locations, we can |
2338 | * find optional sections. */ | |
e180a6b7 RR |
2339 | mod->kp = section_objs(hdr, sechdrs, secstrings, "__param", |
2340 | sizeof(*mod->kp), &mod->num_kp); | |
5e458cc0 RR |
2341 | mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab", |
2342 | sizeof(*mod->syms), &mod->num_syms); | |
2343 | mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab"); | |
2344 | mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl", | |
2345 | sizeof(*mod->gpl_syms), | |
2346 | &mod->num_gpl_syms); | |
2347 | mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
2348 | mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings, | |
2349 | "__ksymtab_gpl_future", | |
2350 | sizeof(*mod->gpl_future_syms), | |
2351 | &mod->num_gpl_future_syms); | |
2352 | mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings, | |
2353 | "__kcrctab_gpl_future"); | |
1da177e4 | 2354 | |
f7f5b675 | 2355 | #ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0 RR |
2356 | mod->unused_syms = section_objs(hdr, sechdrs, secstrings, |
2357 | "__ksymtab_unused", | |
2358 | sizeof(*mod->unused_syms), | |
2359 | &mod->num_unused_syms); | |
2360 | mod->unused_crcs = section_addr(hdr, sechdrs, secstrings, | |
2361 | "__kcrctab_unused"); | |
2362 | mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings, | |
2363 | "__ksymtab_unused_gpl", | |
2364 | sizeof(*mod->unused_gpl_syms), | |
2365 | &mod->num_unused_gpl_syms); | |
2366 | mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings, | |
2367 | "__kcrctab_unused_gpl"); | |
2368 | #endif | |
b99b87f7 PO |
2369 | #ifdef CONFIG_CONSTRUCTORS |
2370 | mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors", | |
2371 | sizeof(*mod->ctors), &mod->num_ctors); | |
2372 | #endif | |
5e458cc0 | 2373 | |
5e458cc0 RR |
2374 | #ifdef CONFIG_TRACEPOINTS |
2375 | mod->tracepoints = section_objs(hdr, sechdrs, secstrings, | |
2376 | "__tracepoints", | |
2377 | sizeof(*mod->tracepoints), | |
2378 | &mod->num_tracepoints); | |
f7f5b675 | 2379 | #endif |
6d723736 SR |
2380 | #ifdef CONFIG_EVENT_TRACING |
2381 | mod->trace_events = section_objs(hdr, sechdrs, secstrings, | |
2382 | "_ftrace_events", | |
2383 | sizeof(*mod->trace_events), | |
2384 | &mod->num_trace_events); | |
2385 | #endif | |
93eb677d SR |
2386 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2387 | /* sechdrs[0].sh_size is always zero */ | |
2388 | mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings, | |
2389 | "__mcount_loc", | |
2390 | sizeof(*mod->ftrace_callsites), | |
2391 | &mod->num_ftrace_callsites); | |
2392 | #endif | |
1da177e4 | 2393 | #ifdef CONFIG_MODVERSIONS |
5e458cc0 RR |
2394 | if ((mod->num_syms && !mod->crcs) |
2395 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2396 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
f7f5b675 | 2397 | #ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0 RR |
2398 | || (mod->num_unused_syms && !mod->unused_crcs) |
2399 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
f7f5b675 DV |
2400 | #endif |
2401 | ) { | |
c6e665c8 RR |
2402 | err = try_to_force_load(mod, |
2403 | "no versions for exported symbols"); | |
826e4506 LT |
2404 | if (err) |
2405 | goto cleanup; | |
1da177e4 LT |
2406 | } |
2407 | #endif | |
2408 | ||
2409 | /* Now do relocations. */ | |
2410 | for (i = 1; i < hdr->e_shnum; i++) { | |
2411 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
2412 | unsigned int info = sechdrs[i].sh_info; | |
2413 | ||
2414 | /* Not a valid relocation section? */ | |
2415 | if (info >= hdr->e_shnum) | |
2416 | continue; | |
2417 | ||
2418 | /* Don't bother with non-allocated sections */ | |
2419 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
2420 | continue; | |
2421 | ||
2422 | if (sechdrs[i].sh_type == SHT_REL) | |
2423 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
2424 | else if (sechdrs[i].sh_type == SHT_RELA) | |
2425 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
2426 | mod); | |
2427 | if (err < 0) | |
2428 | goto cleanup; | |
2429 | } | |
2430 | ||
eea8b54d AN |
2431 | /* Find duplicate symbols */ |
2432 | err = verify_export_symbols(mod); | |
eea8b54d AN |
2433 | if (err < 0) |
2434 | goto cleanup; | |
2435 | ||
1da177e4 | 2436 | /* Set up and sort exception table */ |
5e458cc0 RR |
2437 | mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table", |
2438 | sizeof(*mod->extable), &mod->num_exentries); | |
2439 | sort_extable(mod->extable, mod->extable + mod->num_exentries); | |
1da177e4 LT |
2440 | |
2441 | /* Finally, copy percpu area over. */ | |
2442 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, | |
2443 | sechdrs[pcpuindex].sh_size); | |
2444 | ||
4a496226 | 2445 | add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex, |
554bdfe5 JB |
2446 | symoffs, stroffs, secstrings, strmap); |
2447 | kfree(strmap); | |
2448 | strmap = NULL; | |
1da177e4 | 2449 | |
97e1c18e | 2450 | if (!mod->taints) { |
e9d376f0 | 2451 | struct _ddebug *debug; |
5e458cc0 RR |
2452 | unsigned int num_debug; |
2453 | ||
5e458cc0 RR |
2454 | debug = section_objs(hdr, sechdrs, secstrings, "__verbose", |
2455 | sizeof(*debug), &num_debug); | |
e9d376f0 JB |
2456 | if (debug) |
2457 | dynamic_debug_setup(debug, num_debug); | |
97e1c18e | 2458 | } |
90d595fe | 2459 | |
1da177e4 LT |
2460 | err = module_finalize(hdr, sechdrs, mod); |
2461 | if (err < 0) | |
2462 | goto cleanup; | |
2463 | ||
378bac82 TK |
2464 | /* flush the icache in correct context */ |
2465 | old_fs = get_fs(); | |
2466 | set_fs(KERNEL_DS); | |
2467 | ||
2468 | /* | |
2469 | * Flush the instruction cache, since we've played with text. | |
2470 | * Do it before processing of module parameters, so the module | |
2471 | * can provide parameter accessor functions of its own. | |
2472 | */ | |
2473 | if (mod->module_init) | |
2474 | flush_icache_range((unsigned long)mod->module_init, | |
2475 | (unsigned long)mod->module_init | |
2476 | + mod->init_size); | |
2477 | flush_icache_range((unsigned long)mod->module_core, | |
2478 | (unsigned long)mod->module_core + mod->core_size); | |
2479 | ||
2480 | set_fs(old_fs); | |
2481 | ||
1da177e4 | 2482 | mod->args = args; |
5e458cc0 | 2483 | if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) |
8d3b33f6 RR |
2484 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2485 | mod->name); | |
2486 | ||
bb9d3d56 | 2487 | /* Now sew it into the lists so we can get lockdep and oops |
d72b3751 AK |
2488 | * info during argument parsing. Noone should access us, since |
2489 | * strong_try_module_get() will fail. | |
2490 | * lockdep/oops can run asynchronous, so use the RCU list insertion | |
2491 | * function to insert in a way safe to concurrent readers. | |
2492 | * The mutex protects against concurrent writers. | |
2493 | */ | |
2494 | list_add_rcu(&mod->list, &modules); | |
bb9d3d56 | 2495 | |
e180a6b7 | 2496 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
1da177e4 | 2497 | if (err < 0) |
bb9d3d56 | 2498 | goto unlink; |
1da177e4 | 2499 | |
e180a6b7 | 2500 | err = mod_sysfs_setup(mod, mod->kp, mod->num_kp); |
1da177e4 | 2501 | if (err < 0) |
bb9d3d56 | 2502 | goto unlink; |
1da177e4 | 2503 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
6d760133 | 2504 | add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
1da177e4 LT |
2505 | |
2506 | /* Get rid of temporary copy */ | |
2507 | vfree(hdr); | |
2508 | ||
7ead8b83 LZ |
2509 | trace_module_load(mod); |
2510 | ||
1da177e4 LT |
2511 | /* Done! */ |
2512 | return mod; | |
2513 | ||
bb9d3d56 | 2514 | unlink: |
e91defa2 RR |
2515 | /* Unlink carefully: kallsyms could be walking list. */ |
2516 | list_del_rcu(&mod->list); | |
2517 | synchronize_sched(); | |
1da177e4 LT |
2518 | module_arch_cleanup(mod); |
2519 | cleanup: | |
a263f776 | 2520 | free_modinfo(mod); |
97c146ef KS |
2521 | kobject_del(&mod->mkobj.kobj); |
2522 | kobject_put(&mod->mkobj.kobj); | |
2523 | free_unload: | |
1da177e4 | 2524 | module_unload_free(mod); |
6e2b7574 MH |
2525 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
2526 | percpu_modfree(mod->refptr); | |
ffa9f12a | 2527 | free_init: |
6e2b7574 | 2528 | #endif |
1da177e4 LT |
2529 | module_free(mod, mod->module_init); |
2530 | free_core: | |
2531 | module_free(mod, mod->module_core); | |
6e2b7574 | 2532 | /* mod will be freed with core. Don't access it beyond this line! */ |
1da177e4 LT |
2533 | free_percpu: |
2534 | if (percpu) | |
2535 | percpu_modfree(percpu); | |
2536 | free_mod: | |
2537 | kfree(args); | |
554bdfe5 | 2538 | kfree(strmap); |
1da177e4 LT |
2539 | free_hdr: |
2540 | vfree(hdr); | |
6fe2e70b | 2541 | return ERR_PTR(err); |
1da177e4 LT |
2542 | |
2543 | truncated: | |
2544 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
2545 | err = -ENOEXEC; | |
2546 | goto free_hdr; | |
2547 | } | |
2548 | ||
b99b87f7 PO |
2549 | /* Call module constructors. */ |
2550 | static void do_mod_ctors(struct module *mod) | |
2551 | { | |
2552 | #ifdef CONFIG_CONSTRUCTORS | |
2553 | unsigned long i; | |
2554 | ||
2555 | for (i = 0; i < mod->num_ctors; i++) | |
2556 | mod->ctors[i](); | |
2557 | #endif | |
2558 | } | |
2559 | ||
1da177e4 | 2560 | /* This is where the real work happens */ |
17da2bd9 HC |
2561 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2562 | unsigned long, len, const char __user *, uargs) | |
1da177e4 LT |
2563 | { |
2564 | struct module *mod; | |
2565 | int ret = 0; | |
2566 | ||
2567 | /* Must have permission */ | |
3d43321b | 2568 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
1da177e4 LT |
2569 | return -EPERM; |
2570 | ||
2571 | /* Only one module load at a time, please */ | |
6389a385 | 2572 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
2573 | return -EINTR; |
2574 | ||
2575 | /* Do all the hard work */ | |
2576 | mod = load_module(umod, len, uargs); | |
2577 | if (IS_ERR(mod)) { | |
6389a385 | 2578 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2579 | return PTR_ERR(mod); |
2580 | } | |
2581 | ||
1da177e4 | 2582 | /* Drop lock so they can recurse */ |
6389a385 | 2583 | mutex_unlock(&module_mutex); |
1da177e4 | 2584 | |
e041c683 AS |
2585 | blocking_notifier_call_chain(&module_notify_list, |
2586 | MODULE_STATE_COMING, mod); | |
1da177e4 | 2587 | |
b99b87f7 | 2588 | do_mod_ctors(mod); |
1da177e4 LT |
2589 | /* Start the module */ |
2590 | if (mod->init != NULL) | |
59f9415f | 2591 | ret = do_one_initcall(mod->init); |
1da177e4 LT |
2592 | if (ret < 0) { |
2593 | /* Init routine failed: abort. Try to protect us from | |
2594 | buggy refcounters. */ | |
2595 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2596 | synchronize_sched(); |
af49d924 | 2597 | module_put(mod); |
df4b565e PO |
2598 | blocking_notifier_call_chain(&module_notify_list, |
2599 | MODULE_STATE_GOING, mod); | |
af49d924 RR |
2600 | mutex_lock(&module_mutex); |
2601 | free_module(mod); | |
2602 | mutex_unlock(&module_mutex); | |
c9a3ba55 | 2603 | wake_up(&module_wq); |
1da177e4 LT |
2604 | return ret; |
2605 | } | |
e24e2e64 | 2606 | if (ret > 0) { |
ad361c98 JP |
2607 | printk(KERN_WARNING |
2608 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" | |
2609 | "%s: loading module anyway...\n", | |
e24e2e64 AD |
2610 | __func__, mod->name, ret, |
2611 | __func__); | |
2612 | dump_stack(); | |
2613 | } | |
1da177e4 | 2614 | |
6c5db22d | 2615 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 2616 | mod->state = MODULE_STATE_LIVE; |
6c5db22d | 2617 | wake_up(&module_wq); |
0deddf43 MH |
2618 | blocking_notifier_call_chain(&module_notify_list, |
2619 | MODULE_STATE_LIVE, mod); | |
6c5db22d | 2620 | |
d6de2c80 LT |
2621 | /* We need to finish all async code before the module init sequence is done */ |
2622 | async_synchronize_full(); | |
2623 | ||
6c5db22d | 2624 | mutex_lock(&module_mutex); |
1da177e4 LT |
2625 | /* Drop initial reference. */ |
2626 | module_put(mod); | |
ad6561df | 2627 | trim_init_extable(mod); |
4a496226 JB |
2628 | #ifdef CONFIG_KALLSYMS |
2629 | mod->num_symtab = mod->core_num_syms; | |
2630 | mod->symtab = mod->core_symtab; | |
554bdfe5 | 2631 | mod->strtab = mod->core_strtab; |
4a496226 | 2632 | #endif |
1da177e4 LT |
2633 | module_free(mod, mod->module_init); |
2634 | mod->module_init = NULL; | |
2635 | mod->init_size = 0; | |
2636 | mod->init_text_size = 0; | |
6389a385 | 2637 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2638 | |
2639 | return 0; | |
2640 | } | |
2641 | ||
2642 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2643 | { | |
2644 | return ((void *)addr >= start && (void *)addr < start + size); | |
2645 | } | |
2646 | ||
2647 | #ifdef CONFIG_KALLSYMS | |
2648 | /* | |
2649 | * This ignores the intensely annoying "mapping symbols" found | |
2650 | * in ARM ELF files: $a, $t and $d. | |
2651 | */ | |
2652 | static inline int is_arm_mapping_symbol(const char *str) | |
2653 | { | |
22a8bdeb | 2654 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2655 | && (str[2] == '\0' || str[2] == '.'); |
2656 | } | |
2657 | ||
2658 | static const char *get_ksymbol(struct module *mod, | |
2659 | unsigned long addr, | |
2660 | unsigned long *size, | |
2661 | unsigned long *offset) | |
2662 | { | |
2663 | unsigned int i, best = 0; | |
2664 | unsigned long nextval; | |
2665 | ||
2666 | /* At worse, next value is at end of module */ | |
a06f6211 | 2667 | if (within_module_init(addr, mod)) |
1da177e4 | 2668 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 2669 | else |
1da177e4 LT |
2670 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2671 | ||
2672 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
22a8bdeb | 2673 | starts real symbols at 1). */ |
1da177e4 LT |
2674 | for (i = 1; i < mod->num_symtab; i++) { |
2675 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2676 | continue; | |
2677 | ||
2678 | /* We ignore unnamed symbols: they're uninformative | |
2679 | * and inserted at a whim. */ | |
2680 | if (mod->symtab[i].st_value <= addr | |
2681 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2682 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2683 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2684 | best = i; | |
2685 | if (mod->symtab[i].st_value > addr | |
2686 | && mod->symtab[i].st_value < nextval | |
2687 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2688 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2689 | nextval = mod->symtab[i].st_value; | |
2690 | } | |
2691 | ||
2692 | if (!best) | |
2693 | return NULL; | |
2694 | ||
ffb45122 AD |
2695 | if (size) |
2696 | *size = nextval - mod->symtab[best].st_value; | |
2697 | if (offset) | |
2698 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2699 | return mod->strtab + mod->symtab[best].st_name; |
2700 | } | |
2701 | ||
6dd06c9f RR |
2702 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2703 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 2704 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
2705 | unsigned long *size, |
2706 | unsigned long *offset, | |
2707 | char **modname, | |
2708 | char *namebuf) | |
1da177e4 LT |
2709 | { |
2710 | struct module *mod; | |
cb2a5205 | 2711 | const char *ret = NULL; |
1da177e4 | 2712 | |
cb2a5205 | 2713 | preempt_disable(); |
d72b3751 | 2714 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2715 | if (within_module_init(addr, mod) || |
2716 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
2717 | if (modname) |
2718 | *modname = mod->name; | |
cb2a5205 RR |
2719 | ret = get_ksymbol(mod, addr, size, offset); |
2720 | break; | |
1da177e4 LT |
2721 | } |
2722 | } | |
6dd06c9f RR |
2723 | /* Make a copy in here where it's safe */ |
2724 | if (ret) { | |
2725 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
2726 | ret = namebuf; | |
2727 | } | |
cb2a5205 | 2728 | preempt_enable(); |
92dfc9dc | 2729 | return ret; |
1da177e4 LT |
2730 | } |
2731 | ||
9d65cb4a AD |
2732 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2733 | { | |
2734 | struct module *mod; | |
2735 | ||
cb2a5205 | 2736 | preempt_disable(); |
d72b3751 | 2737 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2738 | if (within_module_init(addr, mod) || |
2739 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
2740 | const char *sym; |
2741 | ||
2742 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2743 | if (!sym) | |
2744 | goto out; | |
9281acea | 2745 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 2746 | preempt_enable(); |
9d65cb4a AD |
2747 | return 0; |
2748 | } | |
2749 | } | |
2750 | out: | |
cb2a5205 | 2751 | preempt_enable(); |
9d65cb4a AD |
2752 | return -ERANGE; |
2753 | } | |
2754 | ||
a5c43dae AD |
2755 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2756 | unsigned long *offset, char *modname, char *name) | |
2757 | { | |
2758 | struct module *mod; | |
2759 | ||
cb2a5205 | 2760 | preempt_disable(); |
d72b3751 | 2761 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2762 | if (within_module_init(addr, mod) || |
2763 | within_module_core(addr, mod)) { | |
a5c43dae AD |
2764 | const char *sym; |
2765 | ||
2766 | sym = get_ksymbol(mod, addr, size, offset); | |
2767 | if (!sym) | |
2768 | goto out; | |
2769 | if (modname) | |
9281acea | 2770 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 2771 | if (name) |
9281acea | 2772 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 2773 | preempt_enable(); |
a5c43dae AD |
2774 | return 0; |
2775 | } | |
2776 | } | |
2777 | out: | |
cb2a5205 | 2778 | preempt_enable(); |
a5c43dae AD |
2779 | return -ERANGE; |
2780 | } | |
2781 | ||
ea07890a AD |
2782 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2783 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2784 | { |
2785 | struct module *mod; | |
2786 | ||
cb2a5205 | 2787 | preempt_disable(); |
d72b3751 | 2788 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
2789 | if (symnum < mod->num_symtab) { |
2790 | *value = mod->symtab[symnum].st_value; | |
2791 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2792 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
2793 | KSYM_NAME_LEN); |
2794 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 2795 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 2796 | preempt_enable(); |
ea07890a | 2797 | return 0; |
1da177e4 LT |
2798 | } |
2799 | symnum -= mod->num_symtab; | |
2800 | } | |
cb2a5205 | 2801 | preempt_enable(); |
ea07890a | 2802 | return -ERANGE; |
1da177e4 LT |
2803 | } |
2804 | ||
2805 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2806 | { | |
2807 | unsigned int i; | |
2808 | ||
2809 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2810 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2811 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2812 | return mod->symtab[i].st_value; |
2813 | return 0; | |
2814 | } | |
2815 | ||
2816 | /* Look for this name: can be of form module:name. */ | |
2817 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2818 | { | |
2819 | struct module *mod; | |
2820 | char *colon; | |
2821 | unsigned long ret = 0; | |
2822 | ||
2823 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 2824 | preempt_disable(); |
1da177e4 LT |
2825 | if ((colon = strchr(name, ':')) != NULL) { |
2826 | *colon = '\0'; | |
2827 | if ((mod = find_module(name)) != NULL) | |
2828 | ret = mod_find_symname(mod, colon+1); | |
2829 | *colon = ':'; | |
2830 | } else { | |
d72b3751 | 2831 | list_for_each_entry_rcu(mod, &modules, list) |
1da177e4 LT |
2832 | if ((ret = mod_find_symname(mod, name)) != 0) |
2833 | break; | |
2834 | } | |
cb2a5205 | 2835 | preempt_enable(); |
1da177e4 LT |
2836 | return ret; |
2837 | } | |
75a66614 AK |
2838 | |
2839 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
2840 | struct module *, unsigned long), | |
2841 | void *data) | |
2842 | { | |
2843 | struct module *mod; | |
2844 | unsigned int i; | |
2845 | int ret; | |
2846 | ||
2847 | list_for_each_entry(mod, &modules, list) { | |
2848 | for (i = 0; i < mod->num_symtab; i++) { | |
2849 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
2850 | mod, mod->symtab[i].st_value); | |
2851 | if (ret != 0) | |
2852 | return ret; | |
2853 | } | |
2854 | } | |
2855 | return 0; | |
2856 | } | |
1da177e4 LT |
2857 | #endif /* CONFIG_KALLSYMS */ |
2858 | ||
21aa9280 | 2859 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
2860 | { |
2861 | int bx = 0; | |
2862 | ||
21aa9280 AV |
2863 | if (mod->taints || |
2864 | mod->state == MODULE_STATE_GOING || | |
2865 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 2866 | buf[bx++] = '('; |
25ddbb18 | 2867 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e8 | 2868 | buf[bx++] = 'P'; |
25ddbb18 | 2869 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e8 | 2870 | buf[bx++] = 'F'; |
26e9a397 | 2871 | if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd3 | 2872 | buf[bx++] = 'C'; |
fa3ba2e8 FM |
2873 | /* |
2874 | * TAINT_FORCED_RMMOD: could be added. | |
2875 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
2876 | * apply to modules. | |
2877 | */ | |
21aa9280 AV |
2878 | |
2879 | /* Show a - for module-is-being-unloaded */ | |
2880 | if (mod->state == MODULE_STATE_GOING) | |
2881 | buf[bx++] = '-'; | |
2882 | /* Show a + for module-is-being-loaded */ | |
2883 | if (mod->state == MODULE_STATE_COMING) | |
2884 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
2885 | buf[bx++] = ')'; |
2886 | } | |
2887 | buf[bx] = '\0'; | |
2888 | ||
2889 | return buf; | |
2890 | } | |
2891 | ||
3b5d5c6b AD |
2892 | #ifdef CONFIG_PROC_FS |
2893 | /* Called by the /proc file system to return a list of modules. */ | |
2894 | static void *m_start(struct seq_file *m, loff_t *pos) | |
2895 | { | |
2896 | mutex_lock(&module_mutex); | |
2897 | return seq_list_start(&modules, *pos); | |
2898 | } | |
2899 | ||
2900 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
2901 | { | |
2902 | return seq_list_next(p, &modules, pos); | |
2903 | } | |
2904 | ||
2905 | static void m_stop(struct seq_file *m, void *p) | |
2906 | { | |
2907 | mutex_unlock(&module_mutex); | |
2908 | } | |
2909 | ||
1da177e4 LT |
2910 | static int m_show(struct seq_file *m, void *p) |
2911 | { | |
2912 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
2913 | char buf[8]; |
2914 | ||
2f0f2a33 | 2915 | seq_printf(m, "%s %u", |
1da177e4 LT |
2916 | mod->name, mod->init_size + mod->core_size); |
2917 | print_unload_info(m, mod); | |
2918 | ||
2919 | /* Informative for users. */ | |
2920 | seq_printf(m, " %s", | |
2921 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2922 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2923 | "Live"); | |
2924 | /* Used by oprofile and other similar tools. */ | |
2925 | seq_printf(m, " 0x%p", mod->module_core); | |
2926 | ||
fa3ba2e8 FM |
2927 | /* Taints info */ |
2928 | if (mod->taints) | |
21aa9280 | 2929 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 2930 | |
1da177e4 LT |
2931 | seq_printf(m, "\n"); |
2932 | return 0; | |
2933 | } | |
2934 | ||
2935 | /* Format: modulename size refcount deps address | |
2936 | ||
2937 | Where refcount is a number or -, and deps is a comma-separated list | |
2938 | of depends or -. | |
2939 | */ | |
3b5d5c6b | 2940 | static const struct seq_operations modules_op = { |
1da177e4 LT |
2941 | .start = m_start, |
2942 | .next = m_next, | |
2943 | .stop = m_stop, | |
2944 | .show = m_show | |
2945 | }; | |
2946 | ||
3b5d5c6b AD |
2947 | static int modules_open(struct inode *inode, struct file *file) |
2948 | { | |
2949 | return seq_open(file, &modules_op); | |
2950 | } | |
2951 | ||
2952 | static const struct file_operations proc_modules_operations = { | |
2953 | .open = modules_open, | |
2954 | .read = seq_read, | |
2955 | .llseek = seq_lseek, | |
2956 | .release = seq_release, | |
2957 | }; | |
2958 | ||
2959 | static int __init proc_modules_init(void) | |
2960 | { | |
2961 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
2962 | return 0; | |
2963 | } | |
2964 | module_init(proc_modules_init); | |
2965 | #endif | |
2966 | ||
1da177e4 LT |
2967 | /* Given an address, look for it in the module exception tables. */ |
2968 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2969 | { | |
1da177e4 LT |
2970 | const struct exception_table_entry *e = NULL; |
2971 | struct module *mod; | |
2972 | ||
24da1cbf | 2973 | preempt_disable(); |
d72b3751 | 2974 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
2975 | if (mod->num_exentries == 0) |
2976 | continue; | |
22a8bdeb | 2977 | |
1da177e4 LT |
2978 | e = search_extable(mod->extable, |
2979 | mod->extable + mod->num_exentries - 1, | |
2980 | addr); | |
2981 | if (e) | |
2982 | break; | |
2983 | } | |
24da1cbf | 2984 | preempt_enable(); |
1da177e4 LT |
2985 | |
2986 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 2987 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
2988 | return e; |
2989 | } | |
2990 | ||
4d435f9d | 2991 | /* |
e610499e RR |
2992 | * is_module_address - is this address inside a module? |
2993 | * @addr: the address to check. | |
2994 | * | |
2995 | * See is_module_text_address() if you simply want to see if the address | |
2996 | * is code (not data). | |
4d435f9d | 2997 | */ |
e610499e | 2998 | bool is_module_address(unsigned long addr) |
4d435f9d | 2999 | { |
e610499e | 3000 | bool ret; |
4d435f9d | 3001 | |
24da1cbf | 3002 | preempt_disable(); |
e610499e | 3003 | ret = __module_address(addr) != NULL; |
24da1cbf | 3004 | preempt_enable(); |
4d435f9d | 3005 | |
e610499e | 3006 | return ret; |
4d435f9d IM |
3007 | } |
3008 | ||
e610499e RR |
3009 | /* |
3010 | * __module_address - get the module which contains an address. | |
3011 | * @addr: the address. | |
3012 | * | |
3013 | * Must be called with preempt disabled or module mutex held so that | |
3014 | * module doesn't get freed during this. | |
3015 | */ | |
714f83d5 | 3016 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3017 | { |
3018 | struct module *mod; | |
3019 | ||
3a642e99 RR |
3020 | if (addr < module_addr_min || addr > module_addr_max) |
3021 | return NULL; | |
3022 | ||
d72b3751 | 3023 | list_for_each_entry_rcu(mod, &modules, list) |
e610499e RR |
3024 | if (within_module_core(addr, mod) |
3025 | || within_module_init(addr, mod)) | |
1da177e4 LT |
3026 | return mod; |
3027 | return NULL; | |
3028 | } | |
c6b37801 | 3029 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3030 | |
e610499e RR |
3031 | /* |
3032 | * is_module_text_address - is this address inside module code? | |
3033 | * @addr: the address to check. | |
3034 | * | |
3035 | * See is_module_address() if you simply want to see if the address is | |
3036 | * anywhere in a module. See kernel_text_address() for testing if an | |
3037 | * address corresponds to kernel or module code. | |
3038 | */ | |
3039 | bool is_module_text_address(unsigned long addr) | |
3040 | { | |
3041 | bool ret; | |
3042 | ||
3043 | preempt_disable(); | |
3044 | ret = __module_text_address(addr) != NULL; | |
3045 | preempt_enable(); | |
3046 | ||
3047 | return ret; | |
3048 | } | |
3049 | ||
3050 | /* | |
3051 | * __module_text_address - get the module whose code contains an address. | |
3052 | * @addr: the address. | |
3053 | * | |
3054 | * Must be called with preempt disabled or module mutex held so that | |
3055 | * module doesn't get freed during this. | |
3056 | */ | |
3057 | struct module *__module_text_address(unsigned long addr) | |
3058 | { | |
3059 | struct module *mod = __module_address(addr); | |
3060 | if (mod) { | |
3061 | /* Make sure it's within the text section. */ | |
3062 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3063 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3064 | mod = NULL; | |
3065 | } | |
3066 | return mod; | |
3067 | } | |
c6b37801 | 3068 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3069 | |
1da177e4 LT |
3070 | /* Don't grab lock, we're oopsing. */ |
3071 | void print_modules(void) | |
3072 | { | |
3073 | struct module *mod; | |
2bc2d61a | 3074 | char buf[8]; |
1da177e4 | 3075 | |
b231125a | 3076 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3077 | /* Most callers should already have preempt disabled, but make sure */ |
3078 | preempt_disable(); | |
3079 | list_for_each_entry_rcu(mod, &modules, list) | |
21aa9280 | 3080 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b3751 | 3081 | preempt_enable(); |
e14af7ee AV |
3082 | if (last_unloaded_module[0]) |
3083 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3084 | printk("\n"); |
3085 | } | |
3086 | ||
1da177e4 | 3087 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3088 | /* Generate the signature for all relevant module structures here. |
3089 | * If these change, we don't want to try to parse the module. */ | |
3090 | void module_layout(struct module *mod, | |
3091 | struct modversion_info *ver, | |
3092 | struct kernel_param *kp, | |
3093 | struct kernel_symbol *ks, | |
3094 | struct marker *marker, | |
3095 | struct tracepoint *tp) | |
3096 | { | |
3097 | } | |
3098 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3099 | #endif |
8256e47c | 3100 | |
97e1c18e MD |
3101 | #ifdef CONFIG_TRACEPOINTS |
3102 | void module_update_tracepoints(void) | |
3103 | { | |
3104 | struct module *mod; | |
3105 | ||
3106 | mutex_lock(&module_mutex); | |
3107 | list_for_each_entry(mod, &modules, list) | |
3108 | if (!mod->taints) | |
3109 | tracepoint_update_probe_range(mod->tracepoints, | |
3110 | mod->tracepoints + mod->num_tracepoints); | |
3111 | mutex_unlock(&module_mutex); | |
3112 | } | |
3113 | ||
3114 | /* | |
3115 | * Returns 0 if current not found. | |
3116 | * Returns 1 if current found. | |
3117 | */ | |
3118 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) | |
3119 | { | |
3120 | struct module *iter_mod; | |
3121 | int found = 0; | |
3122 | ||
3123 | mutex_lock(&module_mutex); | |
3124 | list_for_each_entry(iter_mod, &modules, list) { | |
3125 | if (!iter_mod->taints) { | |
3126 | /* | |
3127 | * Sorted module list | |
3128 | */ | |
3129 | if (iter_mod < iter->module) | |
3130 | continue; | |
3131 | else if (iter_mod > iter->module) | |
3132 | iter->tracepoint = NULL; | |
3133 | found = tracepoint_get_iter_range(&iter->tracepoint, | |
3134 | iter_mod->tracepoints, | |
3135 | iter_mod->tracepoints | |
3136 | + iter_mod->num_tracepoints); | |
3137 | if (found) { | |
3138 | iter->module = iter_mod; | |
3139 | break; | |
3140 | } | |
3141 | } | |
3142 | } | |
3143 | mutex_unlock(&module_mutex); | |
3144 | return found; | |
3145 | } | |
3146 | #endif |