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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 | ||
1da177e4 LT |
62 | #if 0 |
63 | #define DEBUGP printk | |
64 | #else | |
65 | #define DEBUGP(fmt , a...) | |
66 | #endif | |
67 | ||
68 | #ifndef ARCH_SHF_SMALL | |
69 | #define ARCH_SHF_SMALL 0 | |
70 | #endif | |
71 | ||
72 | /* If this is set, the section belongs in the init part of the module */ | |
73 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
74 | ||
75676500 RR |
75 | /* |
76 | * Mutex protects: | |
77 | * 1) List of modules (also safely readable with preempt_disable), | |
78 | * 2) module_use links, | |
79 | * 3) module_addr_min/module_addr_max. | |
d72b3751 | 80 | * (delete uses stop_machine/add uses RCU list operations). */ |
c6b37801 TA |
81 | DEFINE_MUTEX(module_mutex); |
82 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 83 | static LIST_HEAD(modules); |
67fc4e0c JW |
84 | #ifdef CONFIG_KGDB_KDB |
85 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
86 | #endif /* CONFIG_KGDB_KDB */ | |
87 | ||
1da177e4 | 88 | |
19e4529e SR |
89 | /* Block module loading/unloading? */ |
90 | int modules_disabled = 0; | |
91 | ||
c9a3ba55 RR |
92 | /* Waiting for a module to finish initializing? */ |
93 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
94 | ||
e041c683 | 95 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 96 | |
75676500 RR |
97 | /* Bounds of module allocation, for speeding __module_address. |
98 | * Protected by module_mutex. */ | |
3a642e99 RR |
99 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
100 | ||
1da177e4 LT |
101 | int register_module_notifier(struct notifier_block * nb) |
102 | { | |
e041c683 | 103 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
104 | } |
105 | EXPORT_SYMBOL(register_module_notifier); | |
106 | ||
107 | int unregister_module_notifier(struct notifier_block * nb) | |
108 | { | |
e041c683 | 109 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
110 | } |
111 | EXPORT_SYMBOL(unregister_module_notifier); | |
112 | ||
eded41c1 RR |
113 | struct load_info { |
114 | Elf_Ehdr *hdr; | |
115 | unsigned long len; | |
116 | Elf_Shdr *sechdrs; | |
117 | char *secstrings, *args, *strtab; | |
118 | struct { | |
119 | unsigned int sym, str, mod, vers, info, pcpu; | |
120 | } index; | |
121 | }; | |
122 | ||
9a4b9708 ML |
123 | /* We require a truly strong try_module_get(): 0 means failure due to |
124 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
125 | static inline int strong_try_module_get(struct module *mod) |
126 | { | |
127 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
128 | return -EBUSY; |
129 | if (try_module_get(mod)) | |
1da177e4 | 130 | return 0; |
c9a3ba55 RR |
131 | else |
132 | return -ENOENT; | |
1da177e4 LT |
133 | } |
134 | ||
fa3ba2e8 FM |
135 | static inline void add_taint_module(struct module *mod, unsigned flag) |
136 | { | |
137 | add_taint(flag); | |
25ddbb18 | 138 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
139 | } |
140 | ||
02a3e59a RD |
141 | /* |
142 | * A thread that wants to hold a reference to a module only while it | |
143 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
144 | */ |
145 | void __module_put_and_exit(struct module *mod, long code) | |
146 | { | |
147 | module_put(mod); | |
148 | do_exit(code); | |
149 | } | |
150 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 151 | |
1da177e4 LT |
152 | /* Find a module section: 0 means not found. */ |
153 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
154 | Elf_Shdr *sechdrs, | |
155 | const char *secstrings, | |
156 | const char *name) | |
157 | { | |
158 | unsigned int i; | |
159 | ||
160 | for (i = 1; i < hdr->e_shnum; i++) | |
161 | /* Alloc bit cleared means "ignore it." */ | |
162 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
163 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
164 | return i; | |
165 | return 0; | |
166 | } | |
167 | ||
5e458cc0 RR |
168 | /* Find a module section, or NULL. */ |
169 | static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs, | |
170 | const char *secstrings, const char *name) | |
171 | { | |
172 | /* Section 0 has sh_addr 0. */ | |
173 | return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr; | |
174 | } | |
175 | ||
176 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
177 | static void *section_objs(Elf_Ehdr *hdr, | |
178 | Elf_Shdr *sechdrs, | |
179 | const char *secstrings, | |
180 | const char *name, | |
181 | size_t object_size, | |
182 | unsigned int *num) | |
183 | { | |
184 | unsigned int sec = find_sec(hdr, sechdrs, secstrings, name); | |
185 | ||
186 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
187 | *num = sechdrs[sec].sh_size / object_size; | |
188 | return (void *)sechdrs[sec].sh_addr; | |
189 | } | |
190 | ||
1da177e4 LT |
191 | /* Provided by the linker */ |
192 | extern const struct kernel_symbol __start___ksymtab[]; | |
193 | extern const struct kernel_symbol __stop___ksymtab[]; | |
194 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
195 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
196 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
197 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
198 | extern const unsigned long __start___kcrctab[]; |
199 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 200 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
201 | #ifdef CONFIG_UNUSED_SYMBOLS |
202 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
203 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
204 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
205 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
206 | extern const unsigned long __start___kcrctab_unused[]; |
207 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 208 | #endif |
1da177e4 LT |
209 | |
210 | #ifndef CONFIG_MODVERSIONS | |
211 | #define symversion(base, idx) NULL | |
212 | #else | |
f83ca9fe | 213 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
214 | #endif |
215 | ||
dafd0940 RR |
216 | static bool each_symbol_in_section(const struct symsearch *arr, |
217 | unsigned int arrsize, | |
218 | struct module *owner, | |
219 | bool (*fn)(const struct symsearch *syms, | |
220 | struct module *owner, | |
221 | unsigned int symnum, void *data), | |
222 | void *data) | |
ad9546c9 | 223 | { |
dafd0940 | 224 | unsigned int i, j; |
ad9546c9 | 225 | |
dafd0940 RR |
226 | for (j = 0; j < arrsize; j++) { |
227 | for (i = 0; i < arr[j].stop - arr[j].start; i++) | |
228 | if (fn(&arr[j], owner, i, data)) | |
229 | return true; | |
f71d20e9 | 230 | } |
dafd0940 RR |
231 | |
232 | return false; | |
ad9546c9 RR |
233 | } |
234 | ||
dafd0940 | 235 | /* Returns true as soon as fn returns true, otherwise false. */ |
c6b37801 TA |
236 | bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner, |
237 | unsigned int symnum, void *data), void *data) | |
ad9546c9 RR |
238 | { |
239 | struct module *mod; | |
44032e63 | 240 | static const struct symsearch arr[] = { |
ad9546c9 | 241 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 242 | NOT_GPL_ONLY, false }, |
ad9546c9 | 243 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
244 | __start___kcrctab_gpl, |
245 | GPL_ONLY, false }, | |
ad9546c9 | 246 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
247 | __start___kcrctab_gpl_future, |
248 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 249 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 250 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
251 | __start___kcrctab_unused, |
252 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 253 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
254 | __start___kcrctab_unused_gpl, |
255 | GPL_ONLY, true }, | |
f7f5b675 | 256 | #endif |
ad9546c9 | 257 | }; |
f71d20e9 | 258 | |
dafd0940 RR |
259 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
260 | return true; | |
f71d20e9 | 261 | |
d72b3751 | 262 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
263 | struct symsearch arr[] = { |
264 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 265 | NOT_GPL_ONLY, false }, |
ad9546c9 | 266 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
267 | mod->gpl_crcs, |
268 | GPL_ONLY, false }, | |
ad9546c9 RR |
269 | { mod->gpl_future_syms, |
270 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
271 | mod->gpl_future_crcs, |
272 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 273 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
274 | { mod->unused_syms, |
275 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
276 | mod->unused_crcs, |
277 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
278 | { mod->unused_gpl_syms, |
279 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
280 | mod->unused_gpl_crcs, |
281 | GPL_ONLY, true }, | |
f7f5b675 | 282 | #endif |
ad9546c9 RR |
283 | }; |
284 | ||
dafd0940 RR |
285 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
286 | return true; | |
287 | } | |
288 | return false; | |
289 | } | |
c6b37801 | 290 | EXPORT_SYMBOL_GPL(each_symbol); |
dafd0940 RR |
291 | |
292 | struct find_symbol_arg { | |
293 | /* Input */ | |
294 | const char *name; | |
295 | bool gplok; | |
296 | bool warn; | |
297 | ||
298 | /* Output */ | |
299 | struct module *owner; | |
300 | const unsigned long *crc; | |
414fd31b | 301 | const struct kernel_symbol *sym; |
dafd0940 RR |
302 | }; |
303 | ||
304 | static bool find_symbol_in_section(const struct symsearch *syms, | |
305 | struct module *owner, | |
306 | unsigned int symnum, void *data) | |
307 | { | |
308 | struct find_symbol_arg *fsa = data; | |
309 | ||
310 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) | |
311 | return false; | |
312 | ||
313 | if (!fsa->gplok) { | |
314 | if (syms->licence == GPL_ONLY) | |
315 | return false; | |
316 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
317 | printk(KERN_WARNING "Symbol %s is being used " | |
318 | "by a non-GPL module, which will not " | |
319 | "be allowed in the future\n", fsa->name); | |
320 | printk(KERN_WARNING "Please see the file " | |
321 | "Documentation/feature-removal-schedule.txt " | |
322 | "in the kernel source tree for more details.\n"); | |
9f28bb7e | 323 | } |
1da177e4 | 324 | } |
ad9546c9 | 325 | |
f7f5b675 | 326 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
327 | if (syms->unused && fsa->warn) { |
328 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
329 | "however this module is using it.\n", fsa->name); | |
330 | printk(KERN_WARNING | |
331 | "This symbol will go away in the future.\n"); | |
332 | printk(KERN_WARNING | |
333 | "Please evalute if this is the right api to use and if " | |
334 | "it really is, submit a report the linux kernel " | |
335 | "mailinglist together with submitting your code for " | |
336 | "inclusion.\n"); | |
337 | } | |
f7f5b675 | 338 | #endif |
dafd0940 RR |
339 | |
340 | fsa->owner = owner; | |
341 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 342 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
343 | return true; |
344 | } | |
345 | ||
414fd31b | 346 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 347 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
348 | const struct kernel_symbol *find_symbol(const char *name, |
349 | struct module **owner, | |
350 | const unsigned long **crc, | |
351 | bool gplok, | |
352 | bool warn) | |
dafd0940 RR |
353 | { |
354 | struct find_symbol_arg fsa; | |
355 | ||
356 | fsa.name = name; | |
357 | fsa.gplok = gplok; | |
358 | fsa.warn = warn; | |
359 | ||
360 | if (each_symbol(find_symbol_in_section, &fsa)) { | |
361 | if (owner) | |
362 | *owner = fsa.owner; | |
363 | if (crc) | |
364 | *crc = fsa.crc; | |
414fd31b | 365 | return fsa.sym; |
dafd0940 RR |
366 | } |
367 | ||
1da177e4 | 368 | DEBUGP("Failed to find symbol %s\n", name); |
414fd31b | 369 | return NULL; |
1da177e4 | 370 | } |
c6b37801 | 371 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 372 | |
1da177e4 | 373 | /* Search for module by name: must hold module_mutex. */ |
c6b37801 | 374 | struct module *find_module(const char *name) |
1da177e4 LT |
375 | { |
376 | struct module *mod; | |
377 | ||
378 | list_for_each_entry(mod, &modules, list) { | |
379 | if (strcmp(mod->name, name) == 0) | |
380 | return mod; | |
381 | } | |
382 | return NULL; | |
383 | } | |
c6b37801 | 384 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
385 | |
386 | #ifdef CONFIG_SMP | |
fbf59bc9 | 387 | |
259354de | 388 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 389 | { |
259354de TH |
390 | return mod->percpu; |
391 | } | |
fbf59bc9 | 392 | |
259354de TH |
393 | static int percpu_modalloc(struct module *mod, |
394 | unsigned long size, unsigned long align) | |
395 | { | |
fbf59bc9 TH |
396 | if (align > PAGE_SIZE) { |
397 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
259354de | 398 | mod->name, align, PAGE_SIZE); |
fbf59bc9 TH |
399 | align = PAGE_SIZE; |
400 | } | |
401 | ||
259354de TH |
402 | mod->percpu = __alloc_reserved_percpu(size, align); |
403 | if (!mod->percpu) { | |
fbf59bc9 TH |
404 | printk(KERN_WARNING |
405 | "Could not allocate %lu bytes percpu data\n", size); | |
259354de TH |
406 | return -ENOMEM; |
407 | } | |
408 | mod->percpu_size = size; | |
409 | return 0; | |
fbf59bc9 TH |
410 | } |
411 | ||
259354de | 412 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 413 | { |
259354de | 414 | free_percpu(mod->percpu); |
fbf59bc9 TH |
415 | } |
416 | ||
6b588c18 TH |
417 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, |
418 | Elf_Shdr *sechdrs, | |
419 | const char *secstrings) | |
420 | { | |
3d9a854c | 421 | return find_sec(hdr, sechdrs, secstrings, ".data..percpu"); |
6b588c18 TH |
422 | } |
423 | ||
259354de TH |
424 | static void percpu_modcopy(struct module *mod, |
425 | const void *from, unsigned long size) | |
6b588c18 TH |
426 | { |
427 | int cpu; | |
428 | ||
429 | for_each_possible_cpu(cpu) | |
259354de | 430 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
431 | } |
432 | ||
10fad5e4 TH |
433 | /** |
434 | * is_module_percpu_address - test whether address is from module static percpu | |
435 | * @addr: address to test | |
436 | * | |
437 | * Test whether @addr belongs to module static percpu area. | |
438 | * | |
439 | * RETURNS: | |
440 | * %true if @addr is from module static percpu area | |
441 | */ | |
442 | bool is_module_percpu_address(unsigned long addr) | |
443 | { | |
444 | struct module *mod; | |
445 | unsigned int cpu; | |
446 | ||
447 | preempt_disable(); | |
448 | ||
449 | list_for_each_entry_rcu(mod, &modules, list) { | |
450 | if (!mod->percpu_size) | |
451 | continue; | |
452 | for_each_possible_cpu(cpu) { | |
453 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
454 | ||
455 | if ((void *)addr >= start && | |
456 | (void *)addr < start + mod->percpu_size) { | |
457 | preempt_enable(); | |
458 | return true; | |
459 | } | |
460 | } | |
461 | } | |
462 | ||
463 | preempt_enable(); | |
464 | return false; | |
6b588c18 TH |
465 | } |
466 | ||
1da177e4 | 467 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 468 | |
259354de | 469 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
470 | { |
471 | return NULL; | |
472 | } | |
259354de TH |
473 | static inline int percpu_modalloc(struct module *mod, |
474 | unsigned long size, unsigned long align) | |
475 | { | |
476 | return -ENOMEM; | |
477 | } | |
478 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 479 | { |
1da177e4 LT |
480 | } |
481 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
482 | Elf_Shdr *sechdrs, | |
483 | const char *secstrings) | |
484 | { | |
485 | return 0; | |
486 | } | |
259354de TH |
487 | static inline void percpu_modcopy(struct module *mod, |
488 | const void *from, unsigned long size) | |
1da177e4 LT |
489 | { |
490 | /* pcpusec should be 0, and size of that section should be 0. */ | |
491 | BUG_ON(size != 0); | |
492 | } | |
10fad5e4 TH |
493 | bool is_module_percpu_address(unsigned long addr) |
494 | { | |
495 | return false; | |
496 | } | |
6b588c18 | 497 | |
1da177e4 LT |
498 | #endif /* CONFIG_SMP */ |
499 | ||
c988d2b2 MD |
500 | #define MODINFO_ATTR(field) \ |
501 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
502 | { \ | |
503 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
504 | } \ | |
505 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
506 | struct module *mod, char *buffer) \ | |
507 | { \ | |
508 | return sprintf(buffer, "%s\n", mod->field); \ | |
509 | } \ | |
510 | static int modinfo_##field##_exists(struct module *mod) \ | |
511 | { \ | |
512 | return mod->field != NULL; \ | |
513 | } \ | |
514 | static void free_modinfo_##field(struct module *mod) \ | |
515 | { \ | |
22a8bdeb DW |
516 | kfree(mod->field); \ |
517 | mod->field = NULL; \ | |
c988d2b2 MD |
518 | } \ |
519 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 520 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
521 | .show = show_modinfo_##field, \ |
522 | .setup = setup_modinfo_##field, \ | |
523 | .test = modinfo_##field##_exists, \ | |
524 | .free = free_modinfo_##field, \ | |
525 | }; | |
526 | ||
527 | MODINFO_ATTR(version); | |
528 | MODINFO_ATTR(srcversion); | |
529 | ||
e14af7ee AV |
530 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
531 | ||
03e88ae1 | 532 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
533 | |
534 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
535 | ||
1da177e4 | 536 | /* Init the unload section of the module. */ |
9f85a4bb | 537 | static int module_unload_init(struct module *mod) |
1da177e4 | 538 | { |
9f85a4bb RR |
539 | mod->refptr = alloc_percpu(struct module_ref); |
540 | if (!mod->refptr) | |
541 | return -ENOMEM; | |
542 | ||
2c02dfe7 LT |
543 | INIT_LIST_HEAD(&mod->source_list); |
544 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 545 | |
1da177e4 | 546 | /* Hold reference count during initialization. */ |
5fbfb18d | 547 | __this_cpu_write(mod->refptr->incs, 1); |
1da177e4 LT |
548 | /* Backwards compatibility macros put refcount during init. */ |
549 | mod->waiter = current; | |
9f85a4bb RR |
550 | |
551 | return 0; | |
1da177e4 LT |
552 | } |
553 | ||
1da177e4 LT |
554 | /* Does a already use b? */ |
555 | static int already_uses(struct module *a, struct module *b) | |
556 | { | |
557 | struct module_use *use; | |
558 | ||
2c02dfe7 LT |
559 | list_for_each_entry(use, &b->source_list, source_list) { |
560 | if (use->source == a) { | |
1da177e4 LT |
561 | DEBUGP("%s uses %s!\n", a->name, b->name); |
562 | return 1; | |
563 | } | |
564 | } | |
565 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
566 | return 0; | |
567 | } | |
568 | ||
2c02dfe7 LT |
569 | /* |
570 | * Module a uses b | |
571 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
572 | * - the module_use is added to the list of 'b' sources (so | |
573 | * 'b' can walk the list to see who sourced them), and of 'a' | |
574 | * targets (so 'a' can see what modules it targets). | |
575 | */ | |
576 | static int add_module_usage(struct module *a, struct module *b) | |
577 | { | |
2c02dfe7 LT |
578 | struct module_use *use; |
579 | ||
580 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
581 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
582 | if (!use) { | |
583 | printk(KERN_WARNING "%s: out of memory loading\n", a->name); | |
584 | return -ENOMEM; | |
585 | } | |
586 | ||
587 | use->source = a; | |
588 | use->target = b; | |
589 | list_add(&use->source_list, &b->source_list); | |
590 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
591 | return 0; |
592 | } | |
593 | ||
75676500 | 594 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 595 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 596 | { |
c8e21ced | 597 | int err; |
270a6c4c | 598 | |
9bea7f23 | 599 | if (b == NULL || already_uses(a, b)) |
218ce735 | 600 | return 0; |
218ce735 | 601 | |
9bea7f23 RR |
602 | /* If module isn't available, we fail. */ |
603 | err = strong_try_module_get(b); | |
c9a3ba55 | 604 | if (err) |
9bea7f23 | 605 | return err; |
1da177e4 | 606 | |
2c02dfe7 LT |
607 | err = add_module_usage(a, b); |
608 | if (err) { | |
1da177e4 | 609 | module_put(b); |
9bea7f23 | 610 | return err; |
1da177e4 | 611 | } |
9bea7f23 | 612 | return 0; |
1da177e4 | 613 | } |
9bea7f23 | 614 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
615 | |
616 | /* Clear the unload stuff of the module. */ | |
617 | static void module_unload_free(struct module *mod) | |
618 | { | |
2c02dfe7 | 619 | struct module_use *use, *tmp; |
1da177e4 | 620 | |
75676500 | 621 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
622 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
623 | struct module *i = use->target; | |
624 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
625 | module_put(i); | |
626 | list_del(&use->source_list); | |
627 | list_del(&use->target_list); | |
628 | kfree(use); | |
1da177e4 | 629 | } |
75676500 | 630 | mutex_unlock(&module_mutex); |
9f85a4bb RR |
631 | |
632 | free_percpu(mod->refptr); | |
1da177e4 LT |
633 | } |
634 | ||
635 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 636 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
637 | { |
638 | int ret = (flags & O_TRUNC); | |
639 | if (ret) | |
fb169793 | 640 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
641 | return ret; |
642 | } | |
643 | #else | |
fb169793 | 644 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
645 | { |
646 | return 0; | |
647 | } | |
648 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
649 | ||
650 | struct stopref | |
651 | { | |
652 | struct module *mod; | |
653 | int flags; | |
654 | int *forced; | |
655 | }; | |
656 | ||
657 | /* Whole machine is stopped with interrupts off when this runs. */ | |
658 | static int __try_stop_module(void *_sref) | |
659 | { | |
660 | struct stopref *sref = _sref; | |
661 | ||
da39ba5e RR |
662 | /* If it's not unused, quit unless we're forcing. */ |
663 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 664 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
665 | return -EWOULDBLOCK; |
666 | } | |
667 | ||
668 | /* Mark it as dying. */ | |
669 | sref->mod->state = MODULE_STATE_GOING; | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
674 | { | |
da39ba5e RR |
675 | if (flags & O_NONBLOCK) { |
676 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 677 | |
9b1a4d38 | 678 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
679 | } else { |
680 | /* We don't need to stop the machine for this. */ | |
681 | mod->state = MODULE_STATE_GOING; | |
682 | synchronize_sched(); | |
683 | return 0; | |
684 | } | |
1da177e4 LT |
685 | } |
686 | ||
687 | unsigned int module_refcount(struct module *mod) | |
688 | { | |
5fbfb18d | 689 | unsigned int incs = 0, decs = 0; |
720eba31 | 690 | int cpu; |
1da177e4 | 691 | |
720eba31 | 692 | for_each_possible_cpu(cpu) |
5fbfb18d NP |
693 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
694 | /* | |
695 | * ensure the incs are added up after the decs. | |
696 | * module_put ensures incs are visible before decs with smp_wmb. | |
697 | * | |
698 | * This 2-count scheme avoids the situation where the refcount | |
699 | * for CPU0 is read, then CPU0 increments the module refcount, | |
700 | * then CPU1 drops that refcount, then the refcount for CPU1 is | |
701 | * read. We would record a decrement but not its corresponding | |
702 | * increment so we would see a low count (disaster). | |
703 | * | |
704 | * Rare situation? But module_refcount can be preempted, and we | |
705 | * might be tallying up 4096+ CPUs. So it is not impossible. | |
706 | */ | |
707 | smp_rmb(); | |
708 | for_each_possible_cpu(cpu) | |
709 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; | |
710 | return incs - decs; | |
1da177e4 LT |
711 | } |
712 | EXPORT_SYMBOL(module_refcount); | |
713 | ||
714 | /* This exists whether we can unload or not */ | |
715 | static void free_module(struct module *mod); | |
716 | ||
717 | static void wait_for_zero_refcount(struct module *mod) | |
718 | { | |
a6550207 | 719 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 720 | mutex_unlock(&module_mutex); |
1da177e4 LT |
721 | for (;;) { |
722 | DEBUGP("Looking at refcount...\n"); | |
723 | set_current_state(TASK_UNINTERRUPTIBLE); | |
724 | if (module_refcount(mod) == 0) | |
725 | break; | |
726 | schedule(); | |
727 | } | |
728 | current->state = TASK_RUNNING; | |
6389a385 | 729 | mutex_lock(&module_mutex); |
1da177e4 LT |
730 | } |
731 | ||
17da2bd9 HC |
732 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
733 | unsigned int, flags) | |
1da177e4 LT |
734 | { |
735 | struct module *mod; | |
dfff0a06 | 736 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
737 | int ret, forced = 0; |
738 | ||
3d43321b | 739 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
740 | return -EPERM; |
741 | ||
742 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
743 | return -EFAULT; | |
744 | name[MODULE_NAME_LEN-1] = '\0'; | |
745 | ||
3fc1f1e2 TH |
746 | if (mutex_lock_interruptible(&module_mutex) != 0) |
747 | return -EINTR; | |
1da177e4 LT |
748 | |
749 | mod = find_module(name); | |
750 | if (!mod) { | |
751 | ret = -ENOENT; | |
752 | goto out; | |
753 | } | |
754 | ||
2c02dfe7 | 755 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
756 | /* Other modules depend on us: get rid of them first. */ |
757 | ret = -EWOULDBLOCK; | |
758 | goto out; | |
759 | } | |
760 | ||
761 | /* Doing init or already dying? */ | |
762 | if (mod->state != MODULE_STATE_LIVE) { | |
763 | /* FIXME: if (force), slam module count and wake up | |
764 | waiter --RR */ | |
765 | DEBUGP("%s already dying\n", mod->name); | |
766 | ret = -EBUSY; | |
767 | goto out; | |
768 | } | |
769 | ||
770 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 771 | if (mod->init && !mod->exit) { |
fb169793 | 772 | forced = try_force_unload(flags); |
1da177e4 LT |
773 | if (!forced) { |
774 | /* This module can't be removed */ | |
775 | ret = -EBUSY; | |
776 | goto out; | |
777 | } | |
778 | } | |
779 | ||
780 | /* Set this up before setting mod->state */ | |
781 | mod->waiter = current; | |
782 | ||
783 | /* Stop the machine so refcounts can't move and disable module. */ | |
784 | ret = try_stop_module(mod, flags, &forced); | |
785 | if (ret != 0) | |
786 | goto out; | |
787 | ||
788 | /* Never wait if forced. */ | |
789 | if (!forced && module_refcount(mod) != 0) | |
790 | wait_for_zero_refcount(mod); | |
791 | ||
df4b565e | 792 | mutex_unlock(&module_mutex); |
1da177e4 | 793 | /* Final destruction now noone is using it. */ |
df4b565e | 794 | if (mod->exit != NULL) |
1da177e4 | 795 | mod->exit(); |
df4b565e PO |
796 | blocking_notifier_call_chain(&module_notify_list, |
797 | MODULE_STATE_GOING, mod); | |
22a9d645 | 798 | async_synchronize_full(); |
75676500 | 799 | |
e14af7ee | 800 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 801 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 802 | |
75676500 RR |
803 | free_module(mod); |
804 | return 0; | |
805 | out: | |
6389a385 | 806 | mutex_unlock(&module_mutex); |
1da177e4 LT |
807 | return ret; |
808 | } | |
809 | ||
d1e99d7a | 810 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
811 | { |
812 | struct module_use *use; | |
813 | int printed_something = 0; | |
814 | ||
815 | seq_printf(m, " %u ", module_refcount(mod)); | |
816 | ||
817 | /* Always include a trailing , so userspace can differentiate | |
818 | between this and the old multi-field proc format. */ | |
2c02dfe7 | 819 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 820 | printed_something = 1; |
2c02dfe7 | 821 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
822 | } |
823 | ||
1da177e4 LT |
824 | if (mod->init != NULL && mod->exit == NULL) { |
825 | printed_something = 1; | |
826 | seq_printf(m, "[permanent],"); | |
827 | } | |
828 | ||
829 | if (!printed_something) | |
830 | seq_printf(m, "-"); | |
831 | } | |
832 | ||
833 | void __symbol_put(const char *symbol) | |
834 | { | |
835 | struct module *owner; | |
1da177e4 | 836 | |
24da1cbf | 837 | preempt_disable(); |
414fd31b | 838 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
839 | BUG(); |
840 | module_put(owner); | |
24da1cbf | 841 | preempt_enable(); |
1da177e4 LT |
842 | } |
843 | EXPORT_SYMBOL(__symbol_put); | |
844 | ||
7d1d16e4 | 845 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
846 | void symbol_put_addr(void *addr) |
847 | { | |
5e376613 | 848 | struct module *modaddr; |
7d1d16e4 | 849 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 850 | |
7d1d16e4 | 851 | if (core_kernel_text(a)) |
5e376613 | 852 | return; |
1da177e4 | 853 | |
a6e6abd5 RR |
854 | /* module_text_address is safe here: we're supposed to have reference |
855 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 856 | modaddr = __module_text_address(a); |
a6e6abd5 | 857 | BUG_ON(!modaddr); |
5e376613 | 858 | module_put(modaddr); |
1da177e4 LT |
859 | } |
860 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
861 | ||
862 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
863 | struct module *mod, char *buffer) | |
864 | { | |
256e2fdf | 865 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
866 | } |
867 | ||
868 | static struct module_attribute refcnt = { | |
7b595756 | 869 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
870 | .show = show_refcnt, |
871 | }; | |
872 | ||
f6a57033 AV |
873 | void module_put(struct module *module) |
874 | { | |
875 | if (module) { | |
e1783a24 | 876 | preempt_disable(); |
5fbfb18d NP |
877 | smp_wmb(); /* see comment in module_refcount */ |
878 | __this_cpu_inc(module->refptr->decs); | |
e1783a24 | 879 | |
ae832d1e | 880 | trace_module_put(module, _RET_IP_); |
f6a57033 AV |
881 | /* Maybe they're waiting for us to drop reference? */ |
882 | if (unlikely(!module_is_live(module))) | |
883 | wake_up_process(module->waiter); | |
e1783a24 | 884 | preempt_enable(); |
f6a57033 AV |
885 | } |
886 | } | |
887 | EXPORT_SYMBOL(module_put); | |
888 | ||
1da177e4 | 889 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 890 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
891 | { |
892 | /* We don't know the usage count, or what modules are using. */ | |
893 | seq_printf(m, " - -"); | |
894 | } | |
895 | ||
896 | static inline void module_unload_free(struct module *mod) | |
897 | { | |
898 | } | |
899 | ||
9bea7f23 | 900 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 901 | { |
9bea7f23 | 902 | return strong_try_module_get(b); |
1da177e4 | 903 | } |
9bea7f23 | 904 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 905 | |
9f85a4bb | 906 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 907 | { |
9f85a4bb | 908 | return 0; |
1da177e4 LT |
909 | } |
910 | #endif /* CONFIG_MODULE_UNLOAD */ | |
911 | ||
1f71740a KS |
912 | static ssize_t show_initstate(struct module_attribute *mattr, |
913 | struct module *mod, char *buffer) | |
914 | { | |
915 | const char *state = "unknown"; | |
916 | ||
917 | switch (mod->state) { | |
918 | case MODULE_STATE_LIVE: | |
919 | state = "live"; | |
920 | break; | |
921 | case MODULE_STATE_COMING: | |
922 | state = "coming"; | |
923 | break; | |
924 | case MODULE_STATE_GOING: | |
925 | state = "going"; | |
926 | break; | |
927 | } | |
928 | return sprintf(buffer, "%s\n", state); | |
929 | } | |
930 | ||
931 | static struct module_attribute initstate = { | |
7b595756 | 932 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
933 | .show = show_initstate, |
934 | }; | |
935 | ||
03e88ae1 GKH |
936 | static struct module_attribute *modinfo_attrs[] = { |
937 | &modinfo_version, | |
938 | &modinfo_srcversion, | |
1f71740a | 939 | &initstate, |
03e88ae1 GKH |
940 | #ifdef CONFIG_MODULE_UNLOAD |
941 | &refcnt, | |
942 | #endif | |
943 | NULL, | |
944 | }; | |
945 | ||
1da177e4 LT |
946 | static const char vermagic[] = VERMAGIC_STRING; |
947 | ||
c6e665c8 | 948 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
949 | { |
950 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 951 | if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8 RR |
952 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
953 | mod->name, reason); | |
826e4506 LT |
954 | add_taint_module(mod, TAINT_FORCED_MODULE); |
955 | return 0; | |
956 | #else | |
957 | return -ENOEXEC; | |
958 | #endif | |
959 | } | |
960 | ||
1da177e4 | 961 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
962 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
963 | static unsigned long maybe_relocated(unsigned long crc, | |
964 | const struct module *crc_owner) | |
965 | { | |
966 | #ifdef ARCH_RELOCATES_KCRCTAB | |
967 | if (crc_owner == NULL) | |
968 | return crc - (unsigned long)reloc_start; | |
969 | #endif | |
970 | return crc; | |
971 | } | |
972 | ||
1da177e4 LT |
973 | static int check_version(Elf_Shdr *sechdrs, |
974 | unsigned int versindex, | |
975 | const char *symname, | |
976 | struct module *mod, | |
d4703aef RR |
977 | const unsigned long *crc, |
978 | const struct module *crc_owner) | |
1da177e4 LT |
979 | { |
980 | unsigned int i, num_versions; | |
981 | struct modversion_info *versions; | |
982 | ||
983 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
984 | if (!crc) | |
985 | return 1; | |
986 | ||
a5dd6970 RR |
987 | /* No versions at all? modprobe --force does this. */ |
988 | if (versindex == 0) | |
989 | return try_to_force_load(mod, symname) == 0; | |
990 | ||
1da177e4 LT |
991 | versions = (void *) sechdrs[versindex].sh_addr; |
992 | num_versions = sechdrs[versindex].sh_size | |
993 | / sizeof(struct modversion_info); | |
994 | ||
995 | for (i = 0; i < num_versions; i++) { | |
996 | if (strcmp(versions[i].name, symname) != 0) | |
997 | continue; | |
998 | ||
d4703aef | 999 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1000 | return 1; |
1da177e4 | 1001 | DEBUGP("Found checksum %lX vs module %lX\n", |
d4703aef | 1002 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1003 | goto bad_version; |
1da177e4 | 1004 | } |
826e4506 | 1005 | |
a5dd6970 RR |
1006 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1007 | mod->name, symname); | |
1008 | return 0; | |
826e4506 LT |
1009 | |
1010 | bad_version: | |
1011 | printk("%s: disagrees about version of symbol %s\n", | |
1012 | mod->name, symname); | |
1013 | return 0; | |
1da177e4 LT |
1014 | } |
1015 | ||
1016 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1017 | unsigned int versindex, | |
1018 | struct module *mod) | |
1019 | { | |
1020 | const unsigned long *crc; | |
1da177e4 | 1021 | |
75676500 RR |
1022 | /* Since this should be found in kernel (which can't be removed), |
1023 | * no locking is necessary. */ | |
6560dc16 MF |
1024 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
1025 | &crc, true, false)) | |
1da177e4 | 1026 | BUG(); |
d4703aef RR |
1027 | return check_version(sechdrs, versindex, "module_layout", mod, crc, |
1028 | NULL); | |
1da177e4 LT |
1029 | } |
1030 | ||
91e37a79 RR |
1031 | /* First part is kernel version, which we ignore if module has crcs. */ |
1032 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1033 | bool has_crcs) | |
1da177e4 | 1034 | { |
91e37a79 RR |
1035 | if (has_crcs) { |
1036 | amagic += strcspn(amagic, " "); | |
1037 | bmagic += strcspn(bmagic, " "); | |
1038 | } | |
1da177e4 LT |
1039 | return strcmp(amagic, bmagic) == 0; |
1040 | } | |
1041 | #else | |
1042 | static inline int check_version(Elf_Shdr *sechdrs, | |
1043 | unsigned int versindex, | |
1044 | const char *symname, | |
1045 | struct module *mod, | |
d4703aef RR |
1046 | const unsigned long *crc, |
1047 | const struct module *crc_owner) | |
1da177e4 LT |
1048 | { |
1049 | return 1; | |
1050 | } | |
1051 | ||
1052 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1053 | unsigned int versindex, | |
1054 | struct module *mod) | |
1055 | { | |
1056 | return 1; | |
1057 | } | |
1058 | ||
91e37a79 RR |
1059 | static inline int same_magic(const char *amagic, const char *bmagic, |
1060 | bool has_crcs) | |
1da177e4 LT |
1061 | { |
1062 | return strcmp(amagic, bmagic) == 0; | |
1063 | } | |
1064 | #endif /* CONFIG_MODVERSIONS */ | |
1065 | ||
75676500 | 1066 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
414fd31b TA |
1067 | static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs, |
1068 | unsigned int versindex, | |
1069 | const char *name, | |
9bea7f23 RR |
1070 | struct module *mod, |
1071 | char ownername[]) | |
1da177e4 LT |
1072 | { |
1073 | struct module *owner; | |
414fd31b | 1074 | const struct kernel_symbol *sym; |
1da177e4 | 1075 | const unsigned long *crc; |
9bea7f23 | 1076 | int err; |
1da177e4 | 1077 | |
75676500 | 1078 | mutex_lock(&module_mutex); |
414fd31b | 1079 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1080 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1081 | if (!sym) |
1082 | goto unlock; | |
1083 | ||
1084 | if (!check_version(sechdrs, versindex, name, mod, crc, owner)) { | |
1085 | sym = ERR_PTR(-EINVAL); | |
1086 | goto getname; | |
1da177e4 | 1087 | } |
9bea7f23 RR |
1088 | |
1089 | err = ref_module(mod, owner); | |
1090 | if (err) { | |
1091 | sym = ERR_PTR(err); | |
1092 | goto getname; | |
1093 | } | |
1094 | ||
1095 | getname: | |
1096 | /* We must make copy under the lock if we failed to get ref. */ | |
1097 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1098 | unlock: | |
75676500 | 1099 | mutex_unlock(&module_mutex); |
218ce735 | 1100 | return sym; |
1da177e4 LT |
1101 | } |
1102 | ||
9bea7f23 RR |
1103 | static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs, |
1104 | unsigned int versindex, | |
1105 | const char *name, | |
1106 | struct module *mod) | |
1107 | { | |
1108 | const struct kernel_symbol *ksym; | |
1109 | char ownername[MODULE_NAME_LEN]; | |
1110 | ||
1111 | if (wait_event_interruptible_timeout(module_wq, | |
1112 | !IS_ERR(ksym = resolve_symbol(sechdrs, versindex, name, | |
1113 | mod, ownername)) || | |
1114 | PTR_ERR(ksym) != -EBUSY, | |
1115 | 30 * HZ) <= 0) { | |
1116 | printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n", | |
1117 | mod->name, ownername); | |
1118 | } | |
1119 | return ksym; | |
1120 | } | |
1121 | ||
1da177e4 LT |
1122 | /* |
1123 | * /sys/module/foo/sections stuff | |
1124 | * J. Corbet <corbet@lwn.net> | |
1125 | */ | |
120fc3d7 | 1126 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
10b465aa BH |
1127 | |
1128 | static inline bool sect_empty(const Elf_Shdr *sect) | |
1129 | { | |
1130 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1131 | } | |
1132 | ||
a58730c4 RR |
1133 | struct module_sect_attr |
1134 | { | |
1135 | struct module_attribute mattr; | |
1136 | char *name; | |
1137 | unsigned long address; | |
1138 | }; | |
1139 | ||
1140 | struct module_sect_attrs | |
1141 | { | |
1142 | struct attribute_group grp; | |
1143 | unsigned int nsections; | |
1144 | struct module_sect_attr attrs[0]; | |
1145 | }; | |
1146 | ||
1da177e4 LT |
1147 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1148 | struct module *mod, char *buf) | |
1149 | { | |
1150 | struct module_sect_attr *sattr = | |
1151 | container_of(mattr, struct module_sect_attr, mattr); | |
1152 | return sprintf(buf, "0x%lx\n", sattr->address); | |
1153 | } | |
1154 | ||
04b1db9f IN |
1155 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1156 | { | |
a58730c4 | 1157 | unsigned int section; |
04b1db9f IN |
1158 | |
1159 | for (section = 0; section < sect_attrs->nsections; section++) | |
1160 | kfree(sect_attrs->attrs[section].name); | |
1161 | kfree(sect_attrs); | |
1162 | } | |
1163 | ||
1da177e4 LT |
1164 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1165 | char *secstrings, Elf_Shdr *sechdrs) | |
1166 | { | |
1167 | unsigned int nloaded = 0, i, size[2]; | |
1168 | struct module_sect_attrs *sect_attrs; | |
1169 | struct module_sect_attr *sattr; | |
1170 | struct attribute **gattr; | |
22a8bdeb | 1171 | |
1da177e4 LT |
1172 | /* Count loaded sections and allocate structures */ |
1173 | for (i = 0; i < nsect; i++) | |
10b465aa | 1174 | if (!sect_empty(&sechdrs[i])) |
1da177e4 LT |
1175 | nloaded++; |
1176 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1177 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1178 | sizeof(sect_attrs->grp.attrs[0])); | |
1179 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1180 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1181 | if (sect_attrs == NULL) | |
1da177e4 LT |
1182 | return; |
1183 | ||
1184 | /* Setup section attributes. */ | |
1185 | sect_attrs->grp.name = "sections"; | |
1186 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1187 | ||
04b1db9f | 1188 | sect_attrs->nsections = 0; |
1da177e4 LT |
1189 | sattr = §_attrs->attrs[0]; |
1190 | gattr = §_attrs->grp.attrs[0]; | |
1191 | for (i = 0; i < nsect; i++) { | |
10b465aa | 1192 | if (sect_empty(&sechdrs[i])) |
35dead42 | 1193 | continue; |
1da177e4 | 1194 | sattr->address = sechdrs[i].sh_addr; |
04b1db9f IN |
1195 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1196 | GFP_KERNEL); | |
1197 | if (sattr->name == NULL) | |
1198 | goto out; | |
1199 | sect_attrs->nsections++; | |
361795b1 | 1200 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1201 | sattr->mattr.show = module_sect_show; |
1202 | sattr->mattr.store = NULL; | |
1203 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1204 | sattr->mattr.attr.mode = S_IRUGO; |
1205 | *(gattr++) = &(sattr++)->mattr.attr; | |
1206 | } | |
1207 | *gattr = NULL; | |
1208 | ||
1209 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1210 | goto out; | |
1211 | ||
1212 | mod->sect_attrs = sect_attrs; | |
1213 | return; | |
1214 | out: | |
04b1db9f | 1215 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1216 | } |
1217 | ||
1218 | static void remove_sect_attrs(struct module *mod) | |
1219 | { | |
1220 | if (mod->sect_attrs) { | |
1221 | sysfs_remove_group(&mod->mkobj.kobj, | |
1222 | &mod->sect_attrs->grp); | |
1223 | /* We are positive that no one is using any sect attrs | |
1224 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1225 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1226 | mod->sect_attrs = NULL; |
1227 | } | |
1228 | } | |
1229 | ||
6d760133 RM |
1230 | /* |
1231 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1232 | */ | |
1233 | ||
1234 | struct module_notes_attrs { | |
1235 | struct kobject *dir; | |
1236 | unsigned int notes; | |
1237 | struct bin_attribute attrs[0]; | |
1238 | }; | |
1239 | ||
2c3c8bea | 1240 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1241 | struct bin_attribute *bin_attr, |
1242 | char *buf, loff_t pos, size_t count) | |
1243 | { | |
1244 | /* | |
1245 | * The caller checked the pos and count against our size. | |
1246 | */ | |
1247 | memcpy(buf, bin_attr->private + pos, count); | |
1248 | return count; | |
1249 | } | |
1250 | ||
1251 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1252 | unsigned int i) | |
1253 | { | |
1254 | if (notes_attrs->dir) { | |
1255 | while (i-- > 0) | |
1256 | sysfs_remove_bin_file(notes_attrs->dir, | |
1257 | ¬es_attrs->attrs[i]); | |
e9432093 | 1258 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1259 | } |
1260 | kfree(notes_attrs); | |
1261 | } | |
1262 | ||
1263 | static void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1264 | char *secstrings, Elf_Shdr *sechdrs) | |
1265 | { | |
1266 | unsigned int notes, loaded, i; | |
1267 | struct module_notes_attrs *notes_attrs; | |
1268 | struct bin_attribute *nattr; | |
1269 | ||
ea6bff36 IM |
1270 | /* failed to create section attributes, so can't create notes */ |
1271 | if (!mod->sect_attrs) | |
1272 | return; | |
1273 | ||
6d760133 RM |
1274 | /* Count notes sections and allocate structures. */ |
1275 | notes = 0; | |
1276 | for (i = 0; i < nsect; i++) | |
10b465aa | 1277 | if (!sect_empty(&sechdrs[i]) && |
6d760133 RM |
1278 | (sechdrs[i].sh_type == SHT_NOTE)) |
1279 | ++notes; | |
1280 | ||
1281 | if (notes == 0) | |
1282 | return; | |
1283 | ||
1284 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1285 | + notes * sizeof(notes_attrs->attrs[0]), | |
1286 | GFP_KERNEL); | |
1287 | if (notes_attrs == NULL) | |
1288 | return; | |
1289 | ||
1290 | notes_attrs->notes = notes; | |
1291 | nattr = ¬es_attrs->attrs[0]; | |
1292 | for (loaded = i = 0; i < nsect; ++i) { | |
10b465aa | 1293 | if (sect_empty(&sechdrs[i])) |
6d760133 RM |
1294 | continue; |
1295 | if (sechdrs[i].sh_type == SHT_NOTE) { | |
361795b1 | 1296 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1297 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1298 | nattr->attr.mode = S_IRUGO; | |
1299 | nattr->size = sechdrs[i].sh_size; | |
1300 | nattr->private = (void *) sechdrs[i].sh_addr; | |
1301 | nattr->read = module_notes_read; | |
1302 | ++nattr; | |
1303 | } | |
1304 | ++loaded; | |
1305 | } | |
1306 | ||
4ff6abff | 1307 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1308 | if (!notes_attrs->dir) |
1309 | goto out; | |
1310 | ||
1311 | for (i = 0; i < notes; ++i) | |
1312 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1313 | ¬es_attrs->attrs[i])) | |
1314 | goto out; | |
1315 | ||
1316 | mod->notes_attrs = notes_attrs; | |
1317 | return; | |
1318 | ||
1319 | out: | |
1320 | free_notes_attrs(notes_attrs, i); | |
1321 | } | |
1322 | ||
1323 | static void remove_notes_attrs(struct module *mod) | |
1324 | { | |
1325 | if (mod->notes_attrs) | |
1326 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1327 | } | |
1328 | ||
1da177e4 | 1329 | #else |
04b1db9f | 1330 | |
1da177e4 LT |
1331 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1332 | char *sectstrings, Elf_Shdr *sechdrs) | |
1333 | { | |
1334 | } | |
1335 | ||
1336 | static inline void remove_sect_attrs(struct module *mod) | |
1337 | { | |
1338 | } | |
6d760133 RM |
1339 | |
1340 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1341 | char *sectstrings, Elf_Shdr *sechdrs) | |
1342 | { | |
1343 | } | |
1344 | ||
1345 | static inline void remove_notes_attrs(struct module *mod) | |
1346 | { | |
1347 | } | |
120fc3d7 | 1348 | #endif |
1da177e4 | 1349 | |
ef665c1a | 1350 | #ifdef CONFIG_SYSFS |
80a3d1bb RR |
1351 | static void add_usage_links(struct module *mod) |
1352 | { | |
1353 | #ifdef CONFIG_MODULE_UNLOAD | |
1354 | struct module_use *use; | |
1355 | int nowarn; | |
1356 | ||
75676500 | 1357 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1358 | list_for_each_entry(use, &mod->target_list, target_list) { |
1359 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1360 | &mod->mkobj.kobj, mod->name); | |
1361 | } | |
75676500 | 1362 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1363 | #endif |
1364 | } | |
1365 | ||
1366 | static void del_usage_links(struct module *mod) | |
1367 | { | |
1368 | #ifdef CONFIG_MODULE_UNLOAD | |
1369 | struct module_use *use; | |
1370 | ||
75676500 | 1371 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1372 | list_for_each_entry(use, &mod->target_list, target_list) |
1373 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1374 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1375 | #endif |
1376 | } | |
1377 | ||
6407ebb2 | 1378 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1379 | { |
1380 | struct module_attribute *attr; | |
03e88ae1 | 1381 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1382 | int error = 0; |
1383 | int i; | |
1384 | ||
03e88ae1 GKH |
1385 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1386 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1387 | GFP_KERNEL); | |
1388 | if (!mod->modinfo_attrs) | |
1389 | return -ENOMEM; | |
1390 | ||
1391 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1392 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1393 | if (!attr->test || | |
03e88ae1 GKH |
1394 | (attr->test && attr->test(mod))) { |
1395 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1396 | sysfs_attr_init(&temp_attr->attr); |
03e88ae1 GKH |
1397 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1398 | ++temp_attr; | |
1399 | } | |
c988d2b2 MD |
1400 | } |
1401 | return error; | |
1402 | } | |
1403 | ||
6407ebb2 | 1404 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1405 | { |
1406 | struct module_attribute *attr; | |
1407 | int i; | |
1408 | ||
03e88ae1 GKH |
1409 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1410 | /* pick a field to test for end of list */ | |
1411 | if (!attr->attr.name) | |
1412 | break; | |
c988d2b2 | 1413 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1414 | if (attr->free) |
1415 | attr->free(mod); | |
c988d2b2 | 1416 | } |
03e88ae1 | 1417 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1418 | } |
1da177e4 | 1419 | |
6407ebb2 | 1420 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1421 | { |
1422 | int err; | |
6494a93d | 1423 | struct kobject *kobj; |
1da177e4 | 1424 | |
823bccfc GKH |
1425 | if (!module_sysfs_initialized) { |
1426 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1427 | mod->name); |
1428 | err = -EINVAL; | |
1429 | goto out; | |
1430 | } | |
6494a93d GKH |
1431 | |
1432 | kobj = kset_find_obj(module_kset, mod->name); | |
1433 | if (kobj) { | |
1434 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1435 | kobject_put(kobj); | |
1436 | err = -EINVAL; | |
1437 | goto out; | |
1438 | } | |
1439 | ||
1da177e4 | 1440 | mod->mkobj.mod = mod; |
e17e0f51 | 1441 | |
ac3c8141 GKH |
1442 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1443 | mod->mkobj.kobj.kset = module_kset; | |
1444 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1445 | "%s", mod->name); | |
1446 | if (err) | |
1447 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1448 | |
97c146ef | 1449 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1450 | out: |
1451 | return err; | |
1452 | } | |
1453 | ||
6407ebb2 | 1454 | static int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1455 | struct kernel_param *kparam, |
1456 | unsigned int num_params) | |
1457 | { | |
1458 | int err; | |
1459 | ||
80a3d1bb RR |
1460 | err = mod_sysfs_init(mod); |
1461 | if (err) | |
1462 | goto out; | |
1463 | ||
4ff6abff | 1464 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1465 | if (!mod->holders_dir) { |
1466 | err = -ENOMEM; | |
270a6c4c | 1467 | goto out_unreg; |
240936e1 | 1468 | } |
270a6c4c | 1469 | |
1da177e4 LT |
1470 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1471 | if (err) | |
270a6c4c | 1472 | goto out_unreg_holders; |
1da177e4 | 1473 | |
c988d2b2 MD |
1474 | err = module_add_modinfo_attrs(mod); |
1475 | if (err) | |
e17e0f51 | 1476 | goto out_unreg_param; |
c988d2b2 | 1477 | |
80a3d1bb RR |
1478 | add_usage_links(mod); |
1479 | ||
e17e0f51 | 1480 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1481 | return 0; |
1482 | ||
e17e0f51 KS |
1483 | out_unreg_param: |
1484 | module_param_sysfs_remove(mod); | |
270a6c4c | 1485 | out_unreg_holders: |
78a2d906 | 1486 | kobject_put(mod->holders_dir); |
270a6c4c | 1487 | out_unreg: |
e17e0f51 | 1488 | kobject_put(&mod->mkobj.kobj); |
80a3d1bb | 1489 | out: |
1da177e4 LT |
1490 | return err; |
1491 | } | |
34e4e2fe DL |
1492 | |
1493 | static void mod_sysfs_fini(struct module *mod) | |
1494 | { | |
1495 | kobject_put(&mod->mkobj.kobj); | |
1496 | } | |
1497 | ||
1498 | #else /* CONFIG_SYSFS */ | |
1499 | ||
6407ebb2 RR |
1500 | static inline int mod_sysfs_init(struct module *mod) |
1501 | { | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | static inline int mod_sysfs_setup(struct module *mod, | |
1506 | struct kernel_param *kparam, | |
1507 | unsigned int num_params) | |
1508 | { | |
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | static inline int module_add_modinfo_attrs(struct module *mod) | |
1513 | { | |
1514 | return 0; | |
1515 | } | |
1516 | ||
1517 | static inline void module_remove_modinfo_attrs(struct module *mod) | |
1518 | { | |
1519 | } | |
1520 | ||
34e4e2fe DL |
1521 | static void mod_sysfs_fini(struct module *mod) |
1522 | { | |
1523 | } | |
1524 | ||
80a3d1bb RR |
1525 | static void del_usage_links(struct module *mod) |
1526 | { | |
1527 | } | |
1528 | ||
34e4e2fe | 1529 | #endif /* CONFIG_SYSFS */ |
1da177e4 LT |
1530 | |
1531 | static void mod_kobject_remove(struct module *mod) | |
1532 | { | |
80a3d1bb | 1533 | del_usage_links(mod); |
c988d2b2 | 1534 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1535 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1536 | kobject_put(mod->mkobj.drivers_dir); |
1537 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1538 | mod_sysfs_fini(mod); |
1da177e4 LT |
1539 | } |
1540 | ||
1541 | /* | |
1542 | * unlink the module with the whole machine is stopped with interrupts off | |
1543 | * - this defends against kallsyms not taking locks | |
1544 | */ | |
1545 | static int __unlink_module(void *_mod) | |
1546 | { | |
1547 | struct module *mod = _mod; | |
1548 | list_del(&mod->list); | |
1549 | return 0; | |
1550 | } | |
1551 | ||
75676500 | 1552 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1553 | static void free_module(struct module *mod) |
1554 | { | |
7ead8b83 LZ |
1555 | trace_module_free(mod); |
1556 | ||
1da177e4 | 1557 | /* Delete from various lists */ |
75676500 | 1558 | mutex_lock(&module_mutex); |
9b1a4d38 | 1559 | stop_machine(__unlink_module, mod, NULL); |
75676500 | 1560 | mutex_unlock(&module_mutex); |
6d760133 | 1561 | remove_notes_attrs(mod); |
1da177e4 LT |
1562 | remove_sect_attrs(mod); |
1563 | mod_kobject_remove(mod); | |
1564 | ||
b82bab4b JB |
1565 | /* Remove dynamic debug info */ |
1566 | ddebug_remove_module(mod->name); | |
1567 | ||
1da177e4 LT |
1568 | /* Arch-specific cleanup. */ |
1569 | module_arch_cleanup(mod); | |
1570 | ||
1571 | /* Module unload stuff */ | |
1572 | module_unload_free(mod); | |
1573 | ||
e180a6b7 RR |
1574 | /* Free any allocated parameters. */ |
1575 | destroy_params(mod->kp, mod->num_kp); | |
1576 | ||
1da177e4 LT |
1577 | /* This may be NULL, but that's OK */ |
1578 | module_free(mod, mod->module_init); | |
1579 | kfree(mod->args); | |
259354de | 1580 | percpu_modfree(mod); |
9f85a4bb | 1581 | |
fbb9ce95 IM |
1582 | /* Free lock-classes: */ |
1583 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1584 | ||
1da177e4 LT |
1585 | /* Finally, free the core (containing the module structure) */ |
1586 | module_free(mod, mod->module_core); | |
eb8cdec4 BS |
1587 | |
1588 | #ifdef CONFIG_MPU | |
1589 | update_protections(current->mm); | |
1590 | #endif | |
1da177e4 LT |
1591 | } |
1592 | ||
1593 | void *__symbol_get(const char *symbol) | |
1594 | { | |
1595 | struct module *owner; | |
414fd31b | 1596 | const struct kernel_symbol *sym; |
1da177e4 | 1597 | |
24da1cbf | 1598 | preempt_disable(); |
414fd31b TA |
1599 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1600 | if (sym && strong_try_module_get(owner)) | |
1601 | sym = NULL; | |
24da1cbf | 1602 | preempt_enable(); |
1da177e4 | 1603 | |
414fd31b | 1604 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1605 | } |
1606 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1607 | ||
eea8b54d AN |
1608 | /* |
1609 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1610 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1611 | * |
1612 | * You must hold the module_mutex. | |
eea8b54d AN |
1613 | */ |
1614 | static int verify_export_symbols(struct module *mod) | |
1615 | { | |
b211104d | 1616 | unsigned int i; |
eea8b54d | 1617 | struct module *owner; |
b211104d RR |
1618 | const struct kernel_symbol *s; |
1619 | struct { | |
1620 | const struct kernel_symbol *sym; | |
1621 | unsigned int num; | |
1622 | } arr[] = { | |
1623 | { mod->syms, mod->num_syms }, | |
1624 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1625 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1626 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1627 | { mod->unused_syms, mod->num_unused_syms }, |
1628 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1629 | #endif |
b211104d | 1630 | }; |
eea8b54d | 1631 | |
b211104d RR |
1632 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1633 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 1634 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d RR |
1635 | printk(KERN_ERR |
1636 | "%s: exports duplicate symbol %s" | |
1637 | " (owned by %s)\n", | |
1638 | mod->name, s->name, module_name(owner)); | |
1639 | return -ENOEXEC; | |
1640 | } | |
eea8b54d | 1641 | } |
b211104d RR |
1642 | } |
1643 | return 0; | |
eea8b54d AN |
1644 | } |
1645 | ||
9a4b9708 | 1646 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4 LT |
1647 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1648 | unsigned int symindex, | |
1649 | const char *strtab, | |
1650 | unsigned int versindex, | |
1651 | unsigned int pcpuindex, | |
1652 | struct module *mod) | |
1653 | { | |
1654 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1655 | unsigned long secbase; | |
1656 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1657 | int ret = 0; | |
414fd31b | 1658 | const struct kernel_symbol *ksym; |
1da177e4 LT |
1659 | |
1660 | for (i = 1; i < n; i++) { | |
1661 | switch (sym[i].st_shndx) { | |
1662 | case SHN_COMMON: | |
1663 | /* We compiled with -fno-common. These are not | |
1664 | supposed to happen. */ | |
1665 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1666 | printk("%s: please compile with -fno-common\n", | |
1667 | mod->name); | |
1668 | ret = -ENOEXEC; | |
1669 | break; | |
1670 | ||
1671 | case SHN_ABS: | |
1672 | /* Don't need to do anything */ | |
1673 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1674 | (long)sym[i].st_value); | |
1675 | break; | |
1676 | ||
1677 | case SHN_UNDEF: | |
9bea7f23 RR |
1678 | ksym = resolve_symbol_wait(sechdrs, versindex, |
1679 | strtab + sym[i].st_name, | |
1680 | mod); | |
1da177e4 | 1681 | /* Ok if resolved. */ |
9bea7f23 | 1682 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 1683 | sym[i].st_value = ksym->value; |
1da177e4 | 1684 | break; |
414fd31b TA |
1685 | } |
1686 | ||
1da177e4 | 1687 | /* Ok if weak. */ |
9bea7f23 | 1688 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
1689 | break; |
1690 | ||
9bea7f23 RR |
1691 | printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n", |
1692 | mod->name, strtab + sym[i].st_name, | |
1693 | PTR_ERR(ksym)); | |
1694 | ret = PTR_ERR(ksym) ?: -ENOENT; | |
1da177e4 LT |
1695 | break; |
1696 | ||
1697 | default: | |
1698 | /* Divert to percpu allocation if a percpu var. */ | |
1699 | if (sym[i].st_shndx == pcpuindex) | |
259354de | 1700 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 LT |
1701 | else |
1702 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1703 | sym[i].st_value += secbase; | |
1704 | break; | |
1705 | } | |
1706 | } | |
1707 | ||
1708 | return ret; | |
1709 | } | |
1710 | ||
22e268eb RR |
1711 | static int apply_relocations(struct module *mod, |
1712 | Elf_Ehdr *hdr, | |
1713 | Elf_Shdr *sechdrs, | |
1714 | unsigned int symindex, | |
1715 | unsigned int strindex) | |
1716 | { | |
1717 | unsigned int i; | |
1718 | int err = 0; | |
1719 | ||
1720 | /* Now do relocations. */ | |
1721 | for (i = 1; i < hdr->e_shnum; i++) { | |
1722 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
1723 | unsigned int info = sechdrs[i].sh_info; | |
1724 | ||
1725 | /* Not a valid relocation section? */ | |
1726 | if (info >= hdr->e_shnum) | |
1727 | continue; | |
1728 | ||
1729 | /* Don't bother with non-allocated sections */ | |
1730 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
1731 | continue; | |
1732 | ||
1733 | if (sechdrs[i].sh_type == SHT_REL) | |
1734 | err = apply_relocate(sechdrs, strtab, symindex, i, mod); | |
1735 | else if (sechdrs[i].sh_type == SHT_RELA) | |
1736 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
1737 | mod); | |
1738 | if (err < 0) | |
1739 | break; | |
1740 | } | |
1741 | return err; | |
1742 | } | |
1743 | ||
088af9a6 HD |
1744 | /* Additional bytes needed by arch in front of individual sections */ |
1745 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1746 | unsigned int section) | |
1747 | { | |
1748 | /* default implementation just returns zero */ | |
1749 | return 0; | |
1750 | } | |
1751 | ||
1da177e4 | 1752 | /* Update size with this section: return offset. */ |
088af9a6 HD |
1753 | static long get_offset(struct module *mod, unsigned int *size, |
1754 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
1755 | { |
1756 | long ret; | |
1757 | ||
088af9a6 | 1758 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1759 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1760 | *size = ret + sechdr->sh_size; | |
1761 | return ret; | |
1762 | } | |
1763 | ||
1764 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1765 | might -- code, read-only data, read-write data, small data. Tally | |
1766 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1767 | belongs in init. */ | |
1768 | static void layout_sections(struct module *mod, | |
1769 | const Elf_Ehdr *hdr, | |
1770 | Elf_Shdr *sechdrs, | |
1771 | const char *secstrings) | |
1772 | { | |
1773 | static unsigned long const masks[][2] = { | |
1774 | /* NOTE: all executable code must be the first section | |
1775 | * in this array; otherwise modify the text_size | |
1776 | * finder in the two loops below */ | |
1777 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1778 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1779 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1780 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1781 | }; | |
1782 | unsigned int m, i; | |
1783 | ||
1784 | for (i = 0; i < hdr->e_shnum; i++) | |
1785 | sechdrs[i].sh_entsize = ~0UL; | |
1786 | ||
1787 | DEBUGP("Core section allocation order:\n"); | |
1788 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1789 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1790 | Elf_Shdr *s = &sechdrs[i]; | |
1791 | ||
1792 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1793 | || (s->sh_flags & masks[m][1]) | |
1794 | || s->sh_entsize != ~0UL | |
49502677 | 1795 | || strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1796 | continue; |
088af9a6 | 1797 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
1da177e4 LT |
1798 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
1799 | } | |
1800 | if (m == 0) | |
1801 | mod->core_text_size = mod->core_size; | |
1802 | } | |
1803 | ||
1804 | DEBUGP("Init section allocation order:\n"); | |
1805 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1806 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1807 | Elf_Shdr *s = &sechdrs[i]; | |
1808 | ||
1809 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1810 | || (s->sh_flags & masks[m][1]) | |
1811 | || s->sh_entsize != ~0UL | |
49502677 | 1812 | || !strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1813 | continue; |
088af9a6 | 1814 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 LT |
1815 | | INIT_OFFSET_MASK); |
1816 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1817 | } | |
1818 | if (m == 0) | |
1819 | mod->init_text_size = mod->init_size; | |
1820 | } | |
1821 | } | |
1822 | ||
1da177e4 LT |
1823 | static void set_license(struct module *mod, const char *license) |
1824 | { | |
1825 | if (!license) | |
1826 | license = "unspecified"; | |
1827 | ||
fa3ba2e8 | 1828 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1829 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 1830 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1831 | "kernel.\n", mod->name, license); |
1832 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1833 | } |
1834 | } | |
1835 | ||
1836 | /* Parse tag=value strings from .modinfo section */ | |
1837 | static char *next_string(char *string, unsigned long *secsize) | |
1838 | { | |
1839 | /* Skip non-zero chars */ | |
1840 | while (string[0]) { | |
1841 | string++; | |
1842 | if ((*secsize)-- <= 1) | |
1843 | return NULL; | |
1844 | } | |
1845 | ||
1846 | /* Skip any zero padding. */ | |
1847 | while (!string[0]) { | |
1848 | string++; | |
1849 | if ((*secsize)-- <= 1) | |
1850 | return NULL; | |
1851 | } | |
1852 | return string; | |
1853 | } | |
1854 | ||
40dd2560 | 1855 | static char *get_modinfo(const Elf_Shdr *sechdrs, |
1da177e4 LT |
1856 | unsigned int info, |
1857 | const char *tag) | |
1858 | { | |
1859 | char *p; | |
1860 | unsigned int taglen = strlen(tag); | |
1861 | unsigned long size = sechdrs[info].sh_size; | |
1862 | ||
1863 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1864 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1865 | return p + taglen + 1; | |
1866 | } | |
1867 | return NULL; | |
1868 | } | |
1869 | ||
c988d2b2 MD |
1870 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1871 | unsigned int infoindex) | |
1872 | { | |
1873 | struct module_attribute *attr; | |
1874 | int i; | |
1875 | ||
1876 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1877 | if (attr->setup) | |
1878 | attr->setup(mod, | |
1879 | get_modinfo(sechdrs, | |
1880 | infoindex, | |
1881 | attr->attr.name)); | |
1882 | } | |
1883 | } | |
c988d2b2 | 1884 | |
a263f776 RR |
1885 | static void free_modinfo(struct module *mod) |
1886 | { | |
1887 | struct module_attribute *attr; | |
1888 | int i; | |
1889 | ||
1890 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1891 | if (attr->free) | |
1892 | attr->free(mod); | |
1893 | } | |
1894 | } | |
1895 | ||
1da177e4 | 1896 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
1897 | |
1898 | /* lookup symbol in given range of kernel_symbols */ | |
1899 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
1900 | const struct kernel_symbol *start, | |
1901 | const struct kernel_symbol *stop) | |
1902 | { | |
1903 | const struct kernel_symbol *ks = start; | |
1904 | for (; ks < stop; ks++) | |
1905 | if (strcmp(ks->name, name) == 0) | |
1906 | return ks; | |
1907 | return NULL; | |
1908 | } | |
1909 | ||
ca4787b7 TA |
1910 | static int is_exported(const char *name, unsigned long value, |
1911 | const struct module *mod) | |
1da177e4 | 1912 | { |
ca4787b7 TA |
1913 | const struct kernel_symbol *ks; |
1914 | if (!mod) | |
1915 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 1916 | else |
ca4787b7 TA |
1917 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
1918 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
1919 | } |
1920 | ||
1921 | /* As per nm */ | |
eded41c1 | 1922 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 1923 | { |
eded41c1 RR |
1924 | const Elf_Shdr *sechdrs = info->sechdrs; |
1925 | ||
1da177e4 LT |
1926 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
1927 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1928 | return 'v'; | |
1929 | else | |
1930 | return 'w'; | |
1931 | } | |
1932 | if (sym->st_shndx == SHN_UNDEF) | |
1933 | return 'U'; | |
1934 | if (sym->st_shndx == SHN_ABS) | |
1935 | return 'a'; | |
1936 | if (sym->st_shndx >= SHN_LORESERVE) | |
1937 | return '?'; | |
1938 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1939 | return 't'; | |
1940 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1941 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1942 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1943 | return 'r'; | |
1944 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1945 | return 'g'; | |
1946 | else | |
1947 | return 'd'; | |
1948 | } | |
1949 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1950 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1951 | return 's'; | |
1952 | else | |
1953 | return 'b'; | |
1954 | } | |
eded41c1 RR |
1955 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
1956 | ".debug")) { | |
1da177e4 | 1957 | return 'n'; |
eded41c1 | 1958 | } |
1da177e4 LT |
1959 | return '?'; |
1960 | } | |
1961 | ||
4a496226 JB |
1962 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
1963 | unsigned int shnum) | |
1964 | { | |
1965 | const Elf_Shdr *sec; | |
1966 | ||
1967 | if (src->st_shndx == SHN_UNDEF | |
1968 | || src->st_shndx >= shnum | |
1969 | || !src->st_name) | |
1970 | return false; | |
1971 | ||
1972 | sec = sechdrs + src->st_shndx; | |
1973 | if (!(sec->sh_flags & SHF_ALLOC) | |
1974 | #ifndef CONFIG_KALLSYMS_ALL | |
1975 | || !(sec->sh_flags & SHF_EXECINSTR) | |
1976 | #endif | |
1977 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
1978 | return false; | |
1979 | ||
1980 | return true; | |
1981 | } | |
1982 | ||
1983 | static unsigned long layout_symtab(struct module *mod, | |
1984 | Elf_Shdr *sechdrs, | |
1985 | unsigned int symindex, | |
554bdfe5 | 1986 | unsigned int strindex, |
4a496226 | 1987 | const Elf_Ehdr *hdr, |
554bdfe5 JB |
1988 | const char *secstrings, |
1989 | unsigned long *pstroffs, | |
1990 | unsigned long *strmap) | |
4a496226 JB |
1991 | { |
1992 | unsigned long symoffs; | |
1993 | Elf_Shdr *symsect = sechdrs + symindex; | |
554bdfe5 | 1994 | Elf_Shdr *strsect = sechdrs + strindex; |
4a496226 | 1995 | const Elf_Sym *src; |
554bdfe5 | 1996 | const char *strtab; |
4a496226 JB |
1997 | unsigned int i, nsrc, ndst; |
1998 | ||
1999 | /* Put symbol section at end of init part of module. */ | |
2000 | symsect->sh_flags |= SHF_ALLOC; | |
2001 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
2002 | symindex) | INIT_OFFSET_MASK; | |
2003 | DEBUGP("\t%s\n", secstrings + symsect->sh_name); | |
2004 | ||
2005 | src = (void *)hdr + symsect->sh_offset; | |
2006 | nsrc = symsect->sh_size / sizeof(*src); | |
554bdfe5 | 2007 | strtab = (void *)hdr + strsect->sh_offset; |
4a496226 | 2008 | for (ndst = i = 1; i < nsrc; ++i, ++src) |
554bdfe5 JB |
2009 | if (is_core_symbol(src, sechdrs, hdr->e_shnum)) { |
2010 | unsigned int j = src->st_name; | |
2011 | ||
2012 | while(!__test_and_set_bit(j, strmap) && strtab[j]) | |
2013 | ++j; | |
4a496226 | 2014 | ++ndst; |
554bdfe5 | 2015 | } |
4a496226 JB |
2016 | |
2017 | /* Append room for core symbols at end of core part. */ | |
2018 | symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); | |
2019 | mod->core_size = symoffs + ndst * sizeof(Elf_Sym); | |
2020 | ||
554bdfe5 JB |
2021 | /* Put string table section at end of init part of module. */ |
2022 | strsect->sh_flags |= SHF_ALLOC; | |
2023 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
2024 | strindex) | INIT_OFFSET_MASK; | |
2025 | DEBUGP("\t%s\n", secstrings + strsect->sh_name); | |
2026 | ||
2027 | /* Append room for core symbols' strings at end of core part. */ | |
2028 | *pstroffs = mod->core_size; | |
2029 | __set_bit(0, strmap); | |
2030 | mod->core_size += bitmap_weight(strmap, strsect->sh_size); | |
2031 | ||
4a496226 JB |
2032 | return symoffs; |
2033 | } | |
2034 | ||
eded41c1 | 2035 | static void add_kallsyms(struct module *mod, struct load_info *info, |
4a496226 | 2036 | unsigned long symoffs, |
554bdfe5 | 2037 | unsigned long stroffs, |
554bdfe5 | 2038 | unsigned long *strmap) |
1da177e4 | 2039 | { |
4a496226 JB |
2040 | unsigned int i, ndst; |
2041 | const Elf_Sym *src; | |
2042 | Elf_Sym *dst; | |
554bdfe5 | 2043 | char *s; |
eded41c1 | 2044 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2045 | |
eded41c1 RR |
2046 | mod->symtab = (void *)symsec->sh_addr; |
2047 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
2048 | mod->strtab = info->strtab; | |
1da177e4 LT |
2049 | |
2050 | /* Set types up while we still have access to sections. */ | |
2051 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2052 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 JB |
2053 | |
2054 | mod->core_symtab = dst = mod->module_core + symoffs; | |
2055 | src = mod->symtab; | |
2056 | *dst = *src; | |
2057 | for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { | |
eded41c1 | 2058 | if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) |
4a496226 JB |
2059 | continue; |
2060 | dst[ndst] = *src; | |
554bdfe5 | 2061 | dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name); |
4a496226 JB |
2062 | ++ndst; |
2063 | } | |
2064 | mod->core_num_syms = ndst; | |
554bdfe5 JB |
2065 | |
2066 | mod->core_strtab = s = mod->module_core + stroffs; | |
eded41c1 | 2067 | for (*s = 0, i = 1; i < info->sechdrs[info->index.str].sh_size; ++i) |
554bdfe5 JB |
2068 | if (test_bit(i, strmap)) |
2069 | *++s = mod->strtab[i]; | |
1da177e4 LT |
2070 | } |
2071 | #else | |
4a496226 JB |
2072 | static inline unsigned long layout_symtab(struct module *mod, |
2073 | Elf_Shdr *sechdrs, | |
2074 | unsigned int symindex, | |
554bdfe5 | 2075 | unsigned int strindex, |
3ae91c21 | 2076 | const Elf_Ehdr *hdr, |
554bdfe5 JB |
2077 | const char *secstrings, |
2078 | unsigned long *pstroffs, | |
2079 | unsigned long *strmap) | |
4a496226 | 2080 | { |
3ae91c21 | 2081 | return 0; |
4a496226 | 2082 | } |
3ae91c21 | 2083 | |
eded41c1 RR |
2084 | static void add_kallsyms(struct module *mod, struct load_info *info, |
2085 | unsigned long symoffs, | |
2086 | unsigned long stroffs, | |
2087 | unsigned long *strmap) | |
1da177e4 LT |
2088 | { |
2089 | } | |
2090 | #endif /* CONFIG_KALLSYMS */ | |
2091 | ||
e9d376f0 | 2092 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2093 | { |
e9d376f0 JB |
2094 | #ifdef CONFIG_DYNAMIC_DEBUG |
2095 | if (ddebug_add_module(debug, num, debug->modname)) | |
2096 | printk(KERN_ERR "dynamic debug error adding module: %s\n", | |
2097 | debug->modname); | |
2098 | #endif | |
5e458cc0 | 2099 | } |
346e15be | 2100 | |
ff49d74a YS |
2101 | static void dynamic_debug_remove(struct _ddebug *debug) |
2102 | { | |
2103 | if (debug) | |
2104 | ddebug_remove_module(debug->modname); | |
2105 | } | |
2106 | ||
3a642e99 RR |
2107 | static void *module_alloc_update_bounds(unsigned long size) |
2108 | { | |
2109 | void *ret = module_alloc(size); | |
2110 | ||
2111 | if (ret) { | |
75676500 | 2112 | mutex_lock(&module_mutex); |
3a642e99 RR |
2113 | /* Update module bounds. */ |
2114 | if ((unsigned long)ret < module_addr_min) | |
2115 | module_addr_min = (unsigned long)ret; | |
2116 | if ((unsigned long)ret + size > module_addr_max) | |
2117 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2118 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2119 | } |
2120 | return ret; | |
2121 | } | |
2122 | ||
4f2294b6 CM |
2123 | #ifdef CONFIG_DEBUG_KMEMLEAK |
2124 | static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
65b8a9b4 LT |
2125 | const Elf_Shdr *sechdrs, |
2126 | const char *secstrings) | |
4f2294b6 CM |
2127 | { |
2128 | unsigned int i; | |
2129 | ||
2130 | /* only scan the sections containing data */ | |
c017b4be | 2131 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 CM |
2132 | |
2133 | for (i = 1; i < hdr->e_shnum; i++) { | |
2134 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2135 | continue; | |
2136 | if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0 | |
2137 | && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0) | |
2138 | continue; | |
2139 | ||
c017b4be | 2140 | kmemleak_scan_area((void *)sechdrs[i].sh_addr, |
4f2294b6 CM |
2141 | sechdrs[i].sh_size, GFP_KERNEL); |
2142 | } | |
2143 | } | |
2144 | #else | |
2145 | static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
65b8a9b4 LT |
2146 | Elf_Shdr *sechdrs, |
2147 | const char *secstrings) | |
4f2294b6 CM |
2148 | { |
2149 | } | |
2150 | #endif | |
2151 | ||
8b5f61a7 | 2152 | /* Sets info->hdr and info->len. */ |
3264d3f9 | 2153 | static int copy_and_check(struct load_info *info, const void __user *umod, unsigned long len) |
40dd2560 RR |
2154 | { |
2155 | int err; | |
2156 | Elf_Ehdr *hdr; | |
2157 | ||
2158 | if (len < sizeof(*hdr)) | |
2159 | return -ENOEXEC; | |
2160 | ||
2161 | /* Suck in entire file: we'll want most of it. */ | |
2162 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
3264d3f9 | 2163 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) |
40dd2560 RR |
2164 | return -ENOMEM; |
2165 | ||
2166 | if (copy_from_user(hdr, umod, len) != 0) { | |
2167 | err = -EFAULT; | |
2168 | goto free_hdr; | |
2169 | } | |
2170 | ||
2171 | /* Sanity checks against insmoding binaries or wrong arch, | |
2172 | weird elf version */ | |
2173 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2174 | || hdr->e_type != ET_REL | |
2175 | || !elf_check_arch(hdr) | |
2176 | || hdr->e_shentsize != sizeof(Elf_Shdr)) { | |
2177 | err = -ENOEXEC; | |
2178 | goto free_hdr; | |
2179 | } | |
2180 | ||
2181 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { | |
2182 | err = -ENOEXEC; | |
2183 | goto free_hdr; | |
2184 | } | |
3264d3f9 LT |
2185 | info->hdr = hdr; |
2186 | info->len = len; | |
40dd2560 RR |
2187 | return 0; |
2188 | ||
2189 | free_hdr: | |
2190 | vfree(hdr); | |
2191 | return err; | |
2192 | } | |
2193 | ||
8b5f61a7 RR |
2194 | static int rewrite_section_headers(struct load_info *info) |
2195 | { | |
2196 | unsigned int i; | |
2197 | ||
2198 | /* This should always be true, but let's be sure. */ | |
2199 | info->sechdrs[0].sh_addr = 0; | |
2200 | ||
2201 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2202 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2203 | if (shdr->sh_type != SHT_NOBITS | |
2204 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
2205 | printk(KERN_ERR "Module len %lu truncated\n", | |
2206 | info->len); | |
2207 | return -ENOEXEC; | |
2208 | } | |
2209 | ||
2210 | /* Mark all sections sh_addr with their address in the | |
2211 | temporary image. */ | |
2212 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2213 | ||
2214 | #ifndef CONFIG_MODULE_UNLOAD | |
2215 | /* Don't load .exit sections */ | |
2216 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2217 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2218 | #endif | |
8b5f61a7 | 2219 | } |
d6df72a0 RR |
2220 | |
2221 | /* Track but don't keep modinfo and version sections. */ | |
2222 | info->index.vers = find_sec(info->hdr, info->sechdrs, info->secstrings, "__versions"); | |
2223 | info->index.info = find_sec(info->hdr, info->sechdrs, info->secstrings, ".modinfo"); | |
2224 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2225 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2226 | return 0; |
2227 | } | |
2228 | ||
3264d3f9 LT |
2229 | /* |
2230 | * Set up our basic convenience variables (pointers to section headers, | |
2231 | * search for module section index etc), and do some basic section | |
2232 | * verification. | |
2233 | * | |
2234 | * Return the temporary module pointer (we'll replace it with the final | |
2235 | * one when we move the module sections around). | |
2236 | */ | |
2237 | static struct module *setup_load_info(struct load_info *info) | |
2238 | { | |
2239 | unsigned int i; | |
8b5f61a7 | 2240 | int err; |
3264d3f9 LT |
2241 | struct module *mod; |
2242 | ||
2243 | /* Set up the convenience variables */ | |
2244 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2245 | info->secstrings = (void *)info->hdr |
2246 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2247 | |
8b5f61a7 RR |
2248 | err = rewrite_section_headers(info); |
2249 | if (err) | |
2250 | return ERR_PTR(err); | |
3264d3f9 | 2251 | |
8b5f61a7 RR |
2252 | /* Find internal symbols and strings. */ |
2253 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2254 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2255 | info->index.sym = i; | |
2256 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2257 | info->strtab = (char *)info->hdr |
2258 | + info->sechdrs[info->index.str].sh_offset; | |
2259 | break; | |
3264d3f9 | 2260 | } |
3264d3f9 LT |
2261 | } |
2262 | ||
2263 | info->index.mod = find_sec(info->hdr, info->sechdrs, info->secstrings, | |
2264 | ".gnu.linkonce.this_module"); | |
2265 | if (!info->index.mod) { | |
2266 | printk(KERN_WARNING "No module found in object\n"); | |
2267 | return ERR_PTR(-ENOEXEC); | |
2268 | } | |
2269 | /* This is temporary: point mod into copy of data. */ | |
2270 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2271 | ||
2272 | if (info->index.sym == 0) { | |
2273 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
2274 | mod->name); | |
2275 | return ERR_PTR(-ENOEXEC); | |
2276 | } | |
2277 | ||
3264d3f9 LT |
2278 | info->index.pcpu = find_pcpusec(info->hdr, info->sechdrs, info->secstrings); |
2279 | ||
3264d3f9 LT |
2280 | /* Check module struct version now, before we try to use module. */ |
2281 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2282 | return ERR_PTR(-ENOEXEC); | |
2283 | ||
2284 | return mod; | |
3264d3f9 LT |
2285 | } |
2286 | ||
40dd2560 RR |
2287 | static int check_modinfo(struct module *mod, |
2288 | const Elf_Shdr *sechdrs, | |
2289 | unsigned int infoindex, unsigned int versindex) | |
2290 | { | |
2291 | const char *modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
2292 | int err; | |
2293 | ||
2294 | /* This is allowed: modprobe --force will invalidate it. */ | |
2295 | if (!modmagic) { | |
2296 | err = try_to_force_load(mod, "bad vermagic"); | |
2297 | if (err) | |
2298 | return err; | |
2299 | } else if (!same_magic(modmagic, vermagic, versindex)) { | |
2300 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", | |
2301 | mod->name, modmagic, vermagic); | |
2302 | return -ENOEXEC; | |
2303 | } | |
2304 | ||
2305 | if (get_modinfo(sechdrs, infoindex, "staging")) { | |
2306 | add_taint_module(mod, TAINT_CRAP); | |
2307 | printk(KERN_WARNING "%s: module is from the staging directory," | |
2308 | " the quality is unknown, you have been warned.\n", | |
2309 | mod->name); | |
2310 | } | |
22e268eb RR |
2311 | |
2312 | /* Set up license info based on the info section */ | |
2313 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
2314 | ||
40dd2560 RR |
2315 | return 0; |
2316 | } | |
2317 | ||
f91a13bb LT |
2318 | static void find_module_sections(struct module *mod, Elf_Ehdr *hdr, |
2319 | Elf_Shdr *sechdrs, const char *secstrings) | |
2320 | { | |
2321 | mod->kp = section_objs(hdr, sechdrs, secstrings, "__param", | |
2322 | sizeof(*mod->kp), &mod->num_kp); | |
2323 | mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab", | |
2324 | sizeof(*mod->syms), &mod->num_syms); | |
2325 | mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab"); | |
2326 | mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl", | |
2327 | sizeof(*mod->gpl_syms), | |
2328 | &mod->num_gpl_syms); | |
2329 | mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
2330 | mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings, | |
2331 | "__ksymtab_gpl_future", | |
2332 | sizeof(*mod->gpl_future_syms), | |
2333 | &mod->num_gpl_future_syms); | |
2334 | mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings, | |
2335 | "__kcrctab_gpl_future"); | |
2336 | ||
2337 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2338 | mod->unused_syms = section_objs(hdr, sechdrs, secstrings, | |
2339 | "__ksymtab_unused", | |
2340 | sizeof(*mod->unused_syms), | |
2341 | &mod->num_unused_syms); | |
2342 | mod->unused_crcs = section_addr(hdr, sechdrs, secstrings, | |
2343 | "__kcrctab_unused"); | |
2344 | mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings, | |
2345 | "__ksymtab_unused_gpl", | |
2346 | sizeof(*mod->unused_gpl_syms), | |
2347 | &mod->num_unused_gpl_syms); | |
2348 | mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings, | |
2349 | "__kcrctab_unused_gpl"); | |
2350 | #endif | |
2351 | #ifdef CONFIG_CONSTRUCTORS | |
2352 | mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors", | |
2353 | sizeof(*mod->ctors), &mod->num_ctors); | |
2354 | #endif | |
2355 | ||
2356 | #ifdef CONFIG_TRACEPOINTS | |
2357 | mod->tracepoints = section_objs(hdr, sechdrs, secstrings, | |
2358 | "__tracepoints", | |
2359 | sizeof(*mod->tracepoints), | |
2360 | &mod->num_tracepoints); | |
2361 | #endif | |
2362 | #ifdef CONFIG_EVENT_TRACING | |
2363 | mod->trace_events = section_objs(hdr, sechdrs, secstrings, | |
2364 | "_ftrace_events", | |
2365 | sizeof(*mod->trace_events), | |
2366 | &mod->num_trace_events); | |
2367 | /* | |
2368 | * This section contains pointers to allocated objects in the trace | |
2369 | * code and not scanning it leads to false positives. | |
2370 | */ | |
2371 | kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) * | |
2372 | mod->num_trace_events, GFP_KERNEL); | |
2373 | #endif | |
2374 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
2375 | /* sechdrs[0].sh_size is always zero */ | |
2376 | mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings, | |
2377 | "__mcount_loc", | |
2378 | sizeof(*mod->ftrace_callsites), | |
2379 | &mod->num_ftrace_callsites); | |
2380 | #endif | |
22e268eb RR |
2381 | |
2382 | if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) | |
2383 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", | |
2384 | mod->name); | |
f91a13bb LT |
2385 | } |
2386 | ||
65b8a9b4 LT |
2387 | static struct module *move_module(struct module *mod, |
2388 | Elf_Ehdr *hdr, Elf_Shdr *sechdrs, | |
2389 | const char *secstrings, unsigned modindex) | |
2390 | { | |
2391 | int i; | |
2392 | void *ptr; | |
2393 | ||
2394 | /* Do the allocs. */ | |
2395 | ptr = module_alloc_update_bounds(mod->core_size); | |
2396 | /* | |
2397 | * The pointer to this block is stored in the module structure | |
2398 | * which is inside the block. Just mark it as not being a | |
2399 | * leak. | |
2400 | */ | |
2401 | kmemleak_not_leak(ptr); | |
2402 | if (!ptr) | |
2403 | return ERR_PTR(-ENOMEM); | |
2404 | ||
2405 | memset(ptr, 0, mod->core_size); | |
2406 | mod->module_core = ptr; | |
2407 | ||
2408 | ptr = module_alloc_update_bounds(mod->init_size); | |
2409 | /* | |
2410 | * The pointer to this block is stored in the module structure | |
2411 | * which is inside the block. This block doesn't need to be | |
2412 | * scanned as it contains data and code that will be freed | |
2413 | * after the module is initialized. | |
2414 | */ | |
2415 | kmemleak_ignore(ptr); | |
2416 | if (!ptr && mod->init_size) { | |
2417 | module_free(mod, mod->module_core); | |
2418 | return ERR_PTR(-ENOMEM); | |
2419 | } | |
2420 | memset(ptr, 0, mod->init_size); | |
2421 | mod->module_init = ptr; | |
2422 | ||
2423 | /* Transfer each section which specifies SHF_ALLOC */ | |
2424 | DEBUGP("final section addresses:\n"); | |
2425 | for (i = 0; i < hdr->e_shnum; i++) { | |
2426 | void *dest; | |
2427 | ||
2428 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2429 | continue; | |
2430 | ||
2431 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
2432 | dest = mod->module_init | |
2433 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
2434 | else | |
2435 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
2436 | ||
2437 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
2438 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
2439 | sechdrs[i].sh_size); | |
2440 | /* Update sh_addr to point to copy in image. */ | |
2441 | sechdrs[i].sh_addr = (unsigned long)dest; | |
2442 | DEBUGP("\t0x%lx %s\n", | |
2443 | sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
2444 | } | |
2445 | /* Module has been moved. */ | |
2446 | mod = (void *)sechdrs[modindex].sh_addr; | |
2447 | kmemleak_load_module(mod, hdr, sechdrs, secstrings); | |
2448 | return mod; | |
2449 | } | |
2450 | ||
22e268eb RR |
2451 | static int check_module_license_and_versions(struct module *mod, |
2452 | Elf_Shdr *sechdrs) | |
2453 | { | |
2454 | /* | |
2455 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2456 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2457 | * using GPL-only symbols it needs. | |
2458 | */ | |
2459 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
2460 | add_taint(TAINT_PROPRIETARY_MODULE); | |
2461 | ||
2462 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2463 | if (strcmp(mod->name, "driverloader") == 0) | |
2464 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
2465 | ||
2466 | #ifdef CONFIG_MODVERSIONS | |
2467 | if ((mod->num_syms && !mod->crcs) | |
2468 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2469 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
2470 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2471 | || (mod->num_unused_syms && !mod->unused_crcs) | |
2472 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
2473 | #endif | |
2474 | ) { | |
2475 | return try_to_force_load(mod, | |
2476 | "no versions for exported symbols"); | |
2477 | } | |
2478 | #endif | |
2479 | return 0; | |
2480 | } | |
2481 | ||
2482 | static void flush_module_icache(const struct module *mod) | |
2483 | { | |
2484 | mm_segment_t old_fs; | |
2485 | ||
2486 | /* flush the icache in correct context */ | |
2487 | old_fs = get_fs(); | |
2488 | set_fs(KERNEL_DS); | |
2489 | ||
2490 | /* | |
2491 | * Flush the instruction cache, since we've played with text. | |
2492 | * Do it before processing of module parameters, so the module | |
2493 | * can provide parameter accessor functions of its own. | |
2494 | */ | |
2495 | if (mod->module_init) | |
2496 | flush_icache_range((unsigned long)mod->module_init, | |
2497 | (unsigned long)mod->module_init | |
2498 | + mod->init_size); | |
2499 | flush_icache_range((unsigned long)mod->module_core, | |
2500 | (unsigned long)mod->module_core + mod->core_size); | |
2501 | ||
2502 | set_fs(old_fs); | |
2503 | } | |
2504 | ||
1da177e4 LT |
2505 | /* Allocate and load the module: note that size of section 0 is always |
2506 | zero, and we rely on this for optional sections. */ | |
ffb4ba76 | 2507 | static noinline struct module *load_module(void __user *umod, |
1da177e4 LT |
2508 | unsigned long len, |
2509 | const char __user *uargs) | |
2510 | { | |
3264d3f9 | 2511 | struct load_info info = { NULL, }; |
1da177e4 | 2512 | struct module *mod; |
40dd2560 | 2513 | long err; |
554bdfe5 | 2514 | unsigned long symoffs, stroffs, *strmap; |
293a7cfe | 2515 | void __percpu *percpu; |
ff49d74a YS |
2516 | struct _ddebug *debug = NULL; |
2517 | unsigned int num_debug = 0; | |
3ae91c21 | 2518 | |
1da177e4 LT |
2519 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", |
2520 | umod, len, uargs); | |
1da177e4 | 2521 | |
3264d3f9 | 2522 | err = copy_and_check(&info, umod, len); |
40dd2560 RR |
2523 | if (err) |
2524 | return ERR_PTR(err); | |
1da177e4 | 2525 | |
3264d3f9 LT |
2526 | mod = setup_load_info(&info); |
2527 | if (IS_ERR(mod)) { | |
2528 | err = PTR_ERR(mod); | |
1da177e4 LT |
2529 | goto free_hdr; |
2530 | } | |
2531 | ||
3264d3f9 | 2532 | err = check_modinfo(mod, info.sechdrs, info.index.info, info.index.vers); |
40dd2560 | 2533 | if (err) |
1da177e4 | 2534 | goto free_hdr; |
061b1bd3 | 2535 | |
1da177e4 | 2536 | /* Now copy in args */ |
3264d3f9 LT |
2537 | info.args = strndup_user(uargs, ~0UL >> 1); |
2538 | if (IS_ERR(info.args)) { | |
2539 | err = PTR_ERR(info.args); | |
1da177e4 LT |
2540 | goto free_hdr; |
2541 | } | |
8e08b756 | 2542 | |
3264d3f9 | 2543 | strmap = kzalloc(BITS_TO_LONGS(info.sechdrs[info.index.str].sh_size) |
554bdfe5 JB |
2544 | * sizeof(long), GFP_KERNEL); |
2545 | if (!strmap) { | |
2546 | err = -ENOMEM; | |
2547 | goto free_mod; | |
2548 | } | |
2549 | ||
1da177e4 LT |
2550 | mod->state = MODULE_STATE_COMING; |
2551 | ||
2552 | /* Allow arches to frob section contents and sizes. */ | |
3264d3f9 | 2553 | err = module_frob_arch_sections(info.hdr, info.sechdrs, info.secstrings, mod); |
1da177e4 LT |
2554 | if (err < 0) |
2555 | goto free_mod; | |
2556 | ||
3264d3f9 | 2557 | if (info.index.pcpu) { |
1da177e4 | 2558 | /* We have a special allocation for this section. */ |
3264d3f9 LT |
2559 | err = percpu_modalloc(mod, info.sechdrs[info.index.pcpu].sh_size, |
2560 | info.sechdrs[info.index.pcpu].sh_addralign); | |
259354de | 2561 | if (err) |
6e2b7574 | 2562 | goto free_mod; |
3264d3f9 | 2563 | info.sechdrs[info.index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 | 2564 | } |
293a7cfe RR |
2565 | /* Keep this around for failure path. */ |
2566 | percpu = mod_percpu(mod); | |
1da177e4 LT |
2567 | |
2568 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2569 | this is done generically; there doesn't appear to be any | |
2570 | special cases for the architectures. */ | |
3264d3f9 LT |
2571 | layout_sections(mod, info.hdr, info.sechdrs, info.secstrings); |
2572 | symoffs = layout_symtab(mod, info.sechdrs, info.index.sym, info.index.str, info.hdr, | |
2573 | info.secstrings, &stroffs, strmap); | |
1da177e4 | 2574 | |
65b8a9b4 | 2575 | /* Allocate and move to the final place */ |
3264d3f9 | 2576 | mod = move_module(mod, info.hdr, info.sechdrs, info.secstrings, info.index.mod); |
65b8a9b4 LT |
2577 | if (IS_ERR(mod)) { |
2578 | err = PTR_ERR(mod); | |
1da177e4 LT |
2579 | goto free_percpu; |
2580 | } | |
1da177e4 LT |
2581 | |
2582 | /* Now we've moved module, initialize linked lists, etc. */ | |
9f85a4bb RR |
2583 | err = module_unload_init(mod); |
2584 | if (err) | |
2585 | goto free_init; | |
1da177e4 | 2586 | |
22e268eb RR |
2587 | /* Now we've got everything in the final locations, we can |
2588 | * find optional sections. */ | |
3264d3f9 | 2589 | find_module_sections(mod, info.hdr, info.sechdrs, info.secstrings); |
9b37ccfc | 2590 | |
3264d3f9 | 2591 | err = check_module_license_and_versions(mod, info.sechdrs); |
22e268eb RR |
2592 | if (err) |
2593 | goto free_unload; | |
9841d61d | 2594 | |
c988d2b2 | 2595 | /* Set up MODINFO_ATTR fields */ |
3264d3f9 | 2596 | setup_modinfo(mod, info.sechdrs, info.index.info); |
c988d2b2 | 2597 | |
1da177e4 | 2598 | /* Fix up syms, so that st_value is a pointer to location. */ |
3264d3f9 | 2599 | err = simplify_symbols(info.sechdrs, info.index.sym, info.strtab, info.index.vers, info.index.pcpu, |
1da177e4 LT |
2600 | mod); |
2601 | if (err < 0) | |
2602 | goto cleanup; | |
2603 | ||
3264d3f9 | 2604 | err = apply_relocations(mod, info.hdr, info.sechdrs, info.index.sym, info.index.str); |
22e268eb RR |
2605 | if (err < 0) |
2606 | goto cleanup; | |
1da177e4 LT |
2607 | |
2608 | /* Set up and sort exception table */ | |
3264d3f9 | 2609 | mod->extable = section_objs(info.hdr, info.sechdrs, info.secstrings, "__ex_table", |
5e458cc0 RR |
2610 | sizeof(*mod->extable), &mod->num_exentries); |
2611 | sort_extable(mod->extable, mod->extable + mod->num_exentries); | |
1da177e4 LT |
2612 | |
2613 | /* Finally, copy percpu area over. */ | |
3264d3f9 LT |
2614 | percpu_modcopy(mod, (void *)info.sechdrs[info.index.pcpu].sh_addr, |
2615 | info.sechdrs[info.index.pcpu].sh_size); | |
1da177e4 | 2616 | |
eded41c1 | 2617 | add_kallsyms(mod, &info, symoffs, stroffs, strmap); |
554bdfe5 JB |
2618 | kfree(strmap); |
2619 | strmap = NULL; | |
1da177e4 | 2620 | |
ff49d74a | 2621 | if (!mod->taints) |
3264d3f9 | 2622 | debug = section_objs(info.hdr, info.sechdrs, info.secstrings, "__verbose", |
5e458cc0 | 2623 | sizeof(*debug), &num_debug); |
90d595fe | 2624 | |
3264d3f9 | 2625 | err = module_finalize(info.hdr, info.sechdrs, mod); |
1da177e4 LT |
2626 | if (err < 0) |
2627 | goto cleanup; | |
2628 | ||
22e268eb | 2629 | flush_module_icache(mod); |
378bac82 | 2630 | |
3264d3f9 | 2631 | mod->args = info.args; |
8d3b33f6 | 2632 | |
bb9d3d56 | 2633 | /* Now sew it into the lists so we can get lockdep and oops |
d72b3751 AK |
2634 | * info during argument parsing. Noone should access us, since |
2635 | * strong_try_module_get() will fail. | |
2636 | * lockdep/oops can run asynchronous, so use the RCU list insertion | |
2637 | * function to insert in a way safe to concurrent readers. | |
2638 | * The mutex protects against concurrent writers. | |
2639 | */ | |
75676500 | 2640 | mutex_lock(&module_mutex); |
3bafeb62 LT |
2641 | if (find_module(mod->name)) { |
2642 | err = -EEXIST; | |
be593f4c | 2643 | goto unlock; |
3bafeb62 LT |
2644 | } |
2645 | ||
ff49d74a YS |
2646 | if (debug) |
2647 | dynamic_debug_setup(debug, num_debug); | |
2648 | ||
be593f4c RR |
2649 | /* Find duplicate symbols */ |
2650 | err = verify_export_symbols(mod); | |
2651 | if (err < 0) | |
ff49d74a | 2652 | goto ddebug; |
be593f4c | 2653 | |
d72b3751 | 2654 | list_add_rcu(&mod->list, &modules); |
75676500 | 2655 | mutex_unlock(&module_mutex); |
bb9d3d56 | 2656 | |
e180a6b7 | 2657 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
1da177e4 | 2658 | if (err < 0) |
bb9d3d56 | 2659 | goto unlink; |
1da177e4 | 2660 | |
e180a6b7 | 2661 | err = mod_sysfs_setup(mod, mod->kp, mod->num_kp); |
1da177e4 | 2662 | if (err < 0) |
bb9d3d56 | 2663 | goto unlink; |
80a3d1bb | 2664 | |
3264d3f9 LT |
2665 | add_sect_attrs(mod, info.hdr->e_shnum, info.secstrings, info.sechdrs); |
2666 | add_notes_attrs(mod, info.hdr->e_shnum, info.secstrings, info.sechdrs); | |
1da177e4 LT |
2667 | |
2668 | /* Get rid of temporary copy */ | |
3264d3f9 | 2669 | vfree(info.hdr); |
1da177e4 | 2670 | |
7ead8b83 LZ |
2671 | trace_module_load(mod); |
2672 | ||
1da177e4 LT |
2673 | /* Done! */ |
2674 | return mod; | |
2675 | ||
bb9d3d56 | 2676 | unlink: |
75676500 | 2677 | mutex_lock(&module_mutex); |
e91defa2 RR |
2678 | /* Unlink carefully: kallsyms could be walking list. */ |
2679 | list_del_rcu(&mod->list); | |
ff49d74a YS |
2680 | ddebug: |
2681 | dynamic_debug_remove(debug); | |
be593f4c | 2682 | unlock: |
75676500 | 2683 | mutex_unlock(&module_mutex); |
e91defa2 | 2684 | synchronize_sched(); |
1da177e4 LT |
2685 | module_arch_cleanup(mod); |
2686 | cleanup: | |
a263f776 | 2687 | free_modinfo(mod); |
22e268eb | 2688 | free_unload: |
1da177e4 | 2689 | module_unload_free(mod); |
ffa9f12a | 2690 | free_init: |
1da177e4 | 2691 | module_free(mod, mod->module_init); |
1da177e4 | 2692 | module_free(mod, mod->module_core); |
6e2b7574 | 2693 | /* mod will be freed with core. Don't access it beyond this line! */ |
1da177e4 | 2694 | free_percpu: |
293a7cfe | 2695 | free_percpu(percpu); |
1da177e4 | 2696 | free_mod: |
3264d3f9 | 2697 | kfree(info.args); |
554bdfe5 | 2698 | kfree(strmap); |
1da177e4 | 2699 | free_hdr: |
3264d3f9 | 2700 | vfree(info.hdr); |
6fe2e70b | 2701 | return ERR_PTR(err); |
1da177e4 LT |
2702 | } |
2703 | ||
b99b87f7 PO |
2704 | /* Call module constructors. */ |
2705 | static void do_mod_ctors(struct module *mod) | |
2706 | { | |
2707 | #ifdef CONFIG_CONSTRUCTORS | |
2708 | unsigned long i; | |
2709 | ||
2710 | for (i = 0; i < mod->num_ctors; i++) | |
2711 | mod->ctors[i](); | |
2712 | #endif | |
2713 | } | |
2714 | ||
1da177e4 | 2715 | /* This is where the real work happens */ |
17da2bd9 HC |
2716 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2717 | unsigned long, len, const char __user *, uargs) | |
1da177e4 LT |
2718 | { |
2719 | struct module *mod; | |
2720 | int ret = 0; | |
2721 | ||
2722 | /* Must have permission */ | |
3d43321b | 2723 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
1da177e4 LT |
2724 | return -EPERM; |
2725 | ||
1da177e4 LT |
2726 | /* Do all the hard work */ |
2727 | mod = load_module(umod, len, uargs); | |
75676500 | 2728 | if (IS_ERR(mod)) |
1da177e4 | 2729 | return PTR_ERR(mod); |
1da177e4 | 2730 | |
e041c683 AS |
2731 | blocking_notifier_call_chain(&module_notify_list, |
2732 | MODULE_STATE_COMING, mod); | |
1da177e4 | 2733 | |
b99b87f7 | 2734 | do_mod_ctors(mod); |
1da177e4 LT |
2735 | /* Start the module */ |
2736 | if (mod->init != NULL) | |
59f9415f | 2737 | ret = do_one_initcall(mod->init); |
1da177e4 LT |
2738 | if (ret < 0) { |
2739 | /* Init routine failed: abort. Try to protect us from | |
2740 | buggy refcounters. */ | |
2741 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2742 | synchronize_sched(); |
af49d924 | 2743 | module_put(mod); |
df4b565e PO |
2744 | blocking_notifier_call_chain(&module_notify_list, |
2745 | MODULE_STATE_GOING, mod); | |
af49d924 | 2746 | free_module(mod); |
c9a3ba55 | 2747 | wake_up(&module_wq); |
1da177e4 LT |
2748 | return ret; |
2749 | } | |
e24e2e64 | 2750 | if (ret > 0) { |
ad361c98 JP |
2751 | printk(KERN_WARNING |
2752 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" | |
2753 | "%s: loading module anyway...\n", | |
e24e2e64 AD |
2754 | __func__, mod->name, ret, |
2755 | __func__); | |
2756 | dump_stack(); | |
2757 | } | |
1da177e4 | 2758 | |
6c5db22d | 2759 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 2760 | mod->state = MODULE_STATE_LIVE; |
6c5db22d | 2761 | wake_up(&module_wq); |
0deddf43 MH |
2762 | blocking_notifier_call_chain(&module_notify_list, |
2763 | MODULE_STATE_LIVE, mod); | |
6c5db22d | 2764 | |
d6de2c80 LT |
2765 | /* We need to finish all async code before the module init sequence is done */ |
2766 | async_synchronize_full(); | |
2767 | ||
6c5db22d | 2768 | mutex_lock(&module_mutex); |
1da177e4 LT |
2769 | /* Drop initial reference. */ |
2770 | module_put(mod); | |
ad6561df | 2771 | trim_init_extable(mod); |
4a496226 JB |
2772 | #ifdef CONFIG_KALLSYMS |
2773 | mod->num_symtab = mod->core_num_syms; | |
2774 | mod->symtab = mod->core_symtab; | |
554bdfe5 | 2775 | mod->strtab = mod->core_strtab; |
4a496226 | 2776 | #endif |
1da177e4 LT |
2777 | module_free(mod, mod->module_init); |
2778 | mod->module_init = NULL; | |
2779 | mod->init_size = 0; | |
2780 | mod->init_text_size = 0; | |
6389a385 | 2781 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2782 | |
2783 | return 0; | |
2784 | } | |
2785 | ||
2786 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2787 | { | |
2788 | return ((void *)addr >= start && (void *)addr < start + size); | |
2789 | } | |
2790 | ||
2791 | #ifdef CONFIG_KALLSYMS | |
2792 | /* | |
2793 | * This ignores the intensely annoying "mapping symbols" found | |
2794 | * in ARM ELF files: $a, $t and $d. | |
2795 | */ | |
2796 | static inline int is_arm_mapping_symbol(const char *str) | |
2797 | { | |
22a8bdeb | 2798 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2799 | && (str[2] == '\0' || str[2] == '.'); |
2800 | } | |
2801 | ||
2802 | static const char *get_ksymbol(struct module *mod, | |
2803 | unsigned long addr, | |
2804 | unsigned long *size, | |
2805 | unsigned long *offset) | |
2806 | { | |
2807 | unsigned int i, best = 0; | |
2808 | unsigned long nextval; | |
2809 | ||
2810 | /* At worse, next value is at end of module */ | |
a06f6211 | 2811 | if (within_module_init(addr, mod)) |
1da177e4 | 2812 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 2813 | else |
1da177e4 LT |
2814 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2815 | ||
2816 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
22a8bdeb | 2817 | starts real symbols at 1). */ |
1da177e4 LT |
2818 | for (i = 1; i < mod->num_symtab; i++) { |
2819 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2820 | continue; | |
2821 | ||
2822 | /* We ignore unnamed symbols: they're uninformative | |
2823 | * and inserted at a whim. */ | |
2824 | if (mod->symtab[i].st_value <= addr | |
2825 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2826 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2827 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2828 | best = i; | |
2829 | if (mod->symtab[i].st_value > addr | |
2830 | && mod->symtab[i].st_value < nextval | |
2831 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2832 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2833 | nextval = mod->symtab[i].st_value; | |
2834 | } | |
2835 | ||
2836 | if (!best) | |
2837 | return NULL; | |
2838 | ||
ffb45122 AD |
2839 | if (size) |
2840 | *size = nextval - mod->symtab[best].st_value; | |
2841 | if (offset) | |
2842 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2843 | return mod->strtab + mod->symtab[best].st_name; |
2844 | } | |
2845 | ||
6dd06c9f RR |
2846 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2847 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 2848 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
2849 | unsigned long *size, |
2850 | unsigned long *offset, | |
2851 | char **modname, | |
2852 | char *namebuf) | |
1da177e4 LT |
2853 | { |
2854 | struct module *mod; | |
cb2a5205 | 2855 | const char *ret = NULL; |
1da177e4 | 2856 | |
cb2a5205 | 2857 | preempt_disable(); |
d72b3751 | 2858 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2859 | if (within_module_init(addr, mod) || |
2860 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
2861 | if (modname) |
2862 | *modname = mod->name; | |
cb2a5205 RR |
2863 | ret = get_ksymbol(mod, addr, size, offset); |
2864 | break; | |
1da177e4 LT |
2865 | } |
2866 | } | |
6dd06c9f RR |
2867 | /* Make a copy in here where it's safe */ |
2868 | if (ret) { | |
2869 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
2870 | ret = namebuf; | |
2871 | } | |
cb2a5205 | 2872 | preempt_enable(); |
92dfc9dc | 2873 | return ret; |
1da177e4 LT |
2874 | } |
2875 | ||
9d65cb4a AD |
2876 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2877 | { | |
2878 | struct module *mod; | |
2879 | ||
cb2a5205 | 2880 | preempt_disable(); |
d72b3751 | 2881 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2882 | if (within_module_init(addr, mod) || |
2883 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
2884 | const char *sym; |
2885 | ||
2886 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2887 | if (!sym) | |
2888 | goto out; | |
9281acea | 2889 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 2890 | preempt_enable(); |
9d65cb4a AD |
2891 | return 0; |
2892 | } | |
2893 | } | |
2894 | out: | |
cb2a5205 | 2895 | preempt_enable(); |
9d65cb4a AD |
2896 | return -ERANGE; |
2897 | } | |
2898 | ||
a5c43dae AD |
2899 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2900 | unsigned long *offset, char *modname, char *name) | |
2901 | { | |
2902 | struct module *mod; | |
2903 | ||
cb2a5205 | 2904 | preempt_disable(); |
d72b3751 | 2905 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2906 | if (within_module_init(addr, mod) || |
2907 | within_module_core(addr, mod)) { | |
a5c43dae AD |
2908 | const char *sym; |
2909 | ||
2910 | sym = get_ksymbol(mod, addr, size, offset); | |
2911 | if (!sym) | |
2912 | goto out; | |
2913 | if (modname) | |
9281acea | 2914 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 2915 | if (name) |
9281acea | 2916 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 2917 | preempt_enable(); |
a5c43dae AD |
2918 | return 0; |
2919 | } | |
2920 | } | |
2921 | out: | |
cb2a5205 | 2922 | preempt_enable(); |
a5c43dae AD |
2923 | return -ERANGE; |
2924 | } | |
2925 | ||
ea07890a AD |
2926 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2927 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2928 | { |
2929 | struct module *mod; | |
2930 | ||
cb2a5205 | 2931 | preempt_disable(); |
d72b3751 | 2932 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
2933 | if (symnum < mod->num_symtab) { |
2934 | *value = mod->symtab[symnum].st_value; | |
2935 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2936 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
2937 | KSYM_NAME_LEN); |
2938 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 2939 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 2940 | preempt_enable(); |
ea07890a | 2941 | return 0; |
1da177e4 LT |
2942 | } |
2943 | symnum -= mod->num_symtab; | |
2944 | } | |
cb2a5205 | 2945 | preempt_enable(); |
ea07890a | 2946 | return -ERANGE; |
1da177e4 LT |
2947 | } |
2948 | ||
2949 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2950 | { | |
2951 | unsigned int i; | |
2952 | ||
2953 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2954 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2955 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2956 | return mod->symtab[i].st_value; |
2957 | return 0; | |
2958 | } | |
2959 | ||
2960 | /* Look for this name: can be of form module:name. */ | |
2961 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2962 | { | |
2963 | struct module *mod; | |
2964 | char *colon; | |
2965 | unsigned long ret = 0; | |
2966 | ||
2967 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 2968 | preempt_disable(); |
1da177e4 LT |
2969 | if ((colon = strchr(name, ':')) != NULL) { |
2970 | *colon = '\0'; | |
2971 | if ((mod = find_module(name)) != NULL) | |
2972 | ret = mod_find_symname(mod, colon+1); | |
2973 | *colon = ':'; | |
2974 | } else { | |
d72b3751 | 2975 | list_for_each_entry_rcu(mod, &modules, list) |
1da177e4 LT |
2976 | if ((ret = mod_find_symname(mod, name)) != 0) |
2977 | break; | |
2978 | } | |
cb2a5205 | 2979 | preempt_enable(); |
1da177e4 LT |
2980 | return ret; |
2981 | } | |
75a66614 AK |
2982 | |
2983 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
2984 | struct module *, unsigned long), | |
2985 | void *data) | |
2986 | { | |
2987 | struct module *mod; | |
2988 | unsigned int i; | |
2989 | int ret; | |
2990 | ||
2991 | list_for_each_entry(mod, &modules, list) { | |
2992 | for (i = 0; i < mod->num_symtab; i++) { | |
2993 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
2994 | mod, mod->symtab[i].st_value); | |
2995 | if (ret != 0) | |
2996 | return ret; | |
2997 | } | |
2998 | } | |
2999 | return 0; | |
3000 | } | |
1da177e4 LT |
3001 | #endif /* CONFIG_KALLSYMS */ |
3002 | ||
21aa9280 | 3003 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3004 | { |
3005 | int bx = 0; | |
3006 | ||
21aa9280 AV |
3007 | if (mod->taints || |
3008 | mod->state == MODULE_STATE_GOING || | |
3009 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3010 | buf[bx++] = '('; |
25ddbb18 | 3011 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e8 | 3012 | buf[bx++] = 'P'; |
25ddbb18 | 3013 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e8 | 3014 | buf[bx++] = 'F'; |
26e9a397 | 3015 | if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd3 | 3016 | buf[bx++] = 'C'; |
fa3ba2e8 FM |
3017 | /* |
3018 | * TAINT_FORCED_RMMOD: could be added. | |
3019 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
3020 | * apply to modules. | |
3021 | */ | |
21aa9280 AV |
3022 | |
3023 | /* Show a - for module-is-being-unloaded */ | |
3024 | if (mod->state == MODULE_STATE_GOING) | |
3025 | buf[bx++] = '-'; | |
3026 | /* Show a + for module-is-being-loaded */ | |
3027 | if (mod->state == MODULE_STATE_COMING) | |
3028 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3029 | buf[bx++] = ')'; |
3030 | } | |
3031 | buf[bx] = '\0'; | |
3032 | ||
3033 | return buf; | |
3034 | } | |
3035 | ||
3b5d5c6b AD |
3036 | #ifdef CONFIG_PROC_FS |
3037 | /* Called by the /proc file system to return a list of modules. */ | |
3038 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3039 | { | |
3040 | mutex_lock(&module_mutex); | |
3041 | return seq_list_start(&modules, *pos); | |
3042 | } | |
3043 | ||
3044 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3045 | { | |
3046 | return seq_list_next(p, &modules, pos); | |
3047 | } | |
3048 | ||
3049 | static void m_stop(struct seq_file *m, void *p) | |
3050 | { | |
3051 | mutex_unlock(&module_mutex); | |
3052 | } | |
3053 | ||
1da177e4 LT |
3054 | static int m_show(struct seq_file *m, void *p) |
3055 | { | |
3056 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3057 | char buf[8]; |
3058 | ||
2f0f2a33 | 3059 | seq_printf(m, "%s %u", |
1da177e4 LT |
3060 | mod->name, mod->init_size + mod->core_size); |
3061 | print_unload_info(m, mod); | |
3062 | ||
3063 | /* Informative for users. */ | |
3064 | seq_printf(m, " %s", | |
3065 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
3066 | mod->state == MODULE_STATE_COMING ? "Loading": | |
3067 | "Live"); | |
3068 | /* Used by oprofile and other similar tools. */ | |
3069 | seq_printf(m, " 0x%p", mod->module_core); | |
3070 | ||
fa3ba2e8 FM |
3071 | /* Taints info */ |
3072 | if (mod->taints) | |
21aa9280 | 3073 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3074 | |
1da177e4 LT |
3075 | seq_printf(m, "\n"); |
3076 | return 0; | |
3077 | } | |
3078 | ||
3079 | /* Format: modulename size refcount deps address | |
3080 | ||
3081 | Where refcount is a number or -, and deps is a comma-separated list | |
3082 | of depends or -. | |
3083 | */ | |
3b5d5c6b | 3084 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3085 | .start = m_start, |
3086 | .next = m_next, | |
3087 | .stop = m_stop, | |
3088 | .show = m_show | |
3089 | }; | |
3090 | ||
3b5d5c6b AD |
3091 | static int modules_open(struct inode *inode, struct file *file) |
3092 | { | |
3093 | return seq_open(file, &modules_op); | |
3094 | } | |
3095 | ||
3096 | static const struct file_operations proc_modules_operations = { | |
3097 | .open = modules_open, | |
3098 | .read = seq_read, | |
3099 | .llseek = seq_lseek, | |
3100 | .release = seq_release, | |
3101 | }; | |
3102 | ||
3103 | static int __init proc_modules_init(void) | |
3104 | { | |
3105 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3106 | return 0; | |
3107 | } | |
3108 | module_init(proc_modules_init); | |
3109 | #endif | |
3110 | ||
1da177e4 LT |
3111 | /* Given an address, look for it in the module exception tables. */ |
3112 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3113 | { | |
1da177e4 LT |
3114 | const struct exception_table_entry *e = NULL; |
3115 | struct module *mod; | |
3116 | ||
24da1cbf | 3117 | preempt_disable(); |
d72b3751 | 3118 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
3119 | if (mod->num_exentries == 0) |
3120 | continue; | |
22a8bdeb | 3121 | |
1da177e4 LT |
3122 | e = search_extable(mod->extable, |
3123 | mod->extable + mod->num_exentries - 1, | |
3124 | addr); | |
3125 | if (e) | |
3126 | break; | |
3127 | } | |
24da1cbf | 3128 | preempt_enable(); |
1da177e4 LT |
3129 | |
3130 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3131 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3132 | return e; |
3133 | } | |
3134 | ||
4d435f9d | 3135 | /* |
e610499e RR |
3136 | * is_module_address - is this address inside a module? |
3137 | * @addr: the address to check. | |
3138 | * | |
3139 | * See is_module_text_address() if you simply want to see if the address | |
3140 | * is code (not data). | |
4d435f9d | 3141 | */ |
e610499e | 3142 | bool is_module_address(unsigned long addr) |
4d435f9d | 3143 | { |
e610499e | 3144 | bool ret; |
4d435f9d | 3145 | |
24da1cbf | 3146 | preempt_disable(); |
e610499e | 3147 | ret = __module_address(addr) != NULL; |
24da1cbf | 3148 | preempt_enable(); |
4d435f9d | 3149 | |
e610499e | 3150 | return ret; |
4d435f9d IM |
3151 | } |
3152 | ||
e610499e RR |
3153 | /* |
3154 | * __module_address - get the module which contains an address. | |
3155 | * @addr: the address. | |
3156 | * | |
3157 | * Must be called with preempt disabled or module mutex held so that | |
3158 | * module doesn't get freed during this. | |
3159 | */ | |
714f83d5 | 3160 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3161 | { |
3162 | struct module *mod; | |
3163 | ||
3a642e99 RR |
3164 | if (addr < module_addr_min || addr > module_addr_max) |
3165 | return NULL; | |
3166 | ||
d72b3751 | 3167 | list_for_each_entry_rcu(mod, &modules, list) |
e610499e RR |
3168 | if (within_module_core(addr, mod) |
3169 | || within_module_init(addr, mod)) | |
1da177e4 LT |
3170 | return mod; |
3171 | return NULL; | |
3172 | } | |
c6b37801 | 3173 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3174 | |
e610499e RR |
3175 | /* |
3176 | * is_module_text_address - is this address inside module code? | |
3177 | * @addr: the address to check. | |
3178 | * | |
3179 | * See is_module_address() if you simply want to see if the address is | |
3180 | * anywhere in a module. See kernel_text_address() for testing if an | |
3181 | * address corresponds to kernel or module code. | |
3182 | */ | |
3183 | bool is_module_text_address(unsigned long addr) | |
3184 | { | |
3185 | bool ret; | |
3186 | ||
3187 | preempt_disable(); | |
3188 | ret = __module_text_address(addr) != NULL; | |
3189 | preempt_enable(); | |
3190 | ||
3191 | return ret; | |
3192 | } | |
3193 | ||
3194 | /* | |
3195 | * __module_text_address - get the module whose code contains an address. | |
3196 | * @addr: the address. | |
3197 | * | |
3198 | * Must be called with preempt disabled or module mutex held so that | |
3199 | * module doesn't get freed during this. | |
3200 | */ | |
3201 | struct module *__module_text_address(unsigned long addr) | |
3202 | { | |
3203 | struct module *mod = __module_address(addr); | |
3204 | if (mod) { | |
3205 | /* Make sure it's within the text section. */ | |
3206 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3207 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3208 | mod = NULL; | |
3209 | } | |
3210 | return mod; | |
3211 | } | |
c6b37801 | 3212 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3213 | |
1da177e4 LT |
3214 | /* Don't grab lock, we're oopsing. */ |
3215 | void print_modules(void) | |
3216 | { | |
3217 | struct module *mod; | |
2bc2d61a | 3218 | char buf[8]; |
1da177e4 | 3219 | |
b231125a | 3220 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3221 | /* Most callers should already have preempt disabled, but make sure */ |
3222 | preempt_disable(); | |
3223 | list_for_each_entry_rcu(mod, &modules, list) | |
21aa9280 | 3224 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b3751 | 3225 | preempt_enable(); |
e14af7ee AV |
3226 | if (last_unloaded_module[0]) |
3227 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3228 | printk("\n"); |
3229 | } | |
3230 | ||
1da177e4 | 3231 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3232 | /* Generate the signature for all relevant module structures here. |
3233 | * If these change, we don't want to try to parse the module. */ | |
3234 | void module_layout(struct module *mod, | |
3235 | struct modversion_info *ver, | |
3236 | struct kernel_param *kp, | |
3237 | struct kernel_symbol *ks, | |
8c8ef42a RR |
3238 | struct tracepoint *tp) |
3239 | { | |
3240 | } | |
3241 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3242 | #endif |
8256e47c | 3243 | |
97e1c18e MD |
3244 | #ifdef CONFIG_TRACEPOINTS |
3245 | void module_update_tracepoints(void) | |
3246 | { | |
3247 | struct module *mod; | |
3248 | ||
3249 | mutex_lock(&module_mutex); | |
3250 | list_for_each_entry(mod, &modules, list) | |
3251 | if (!mod->taints) | |
3252 | tracepoint_update_probe_range(mod->tracepoints, | |
3253 | mod->tracepoints + mod->num_tracepoints); | |
3254 | mutex_unlock(&module_mutex); | |
3255 | } | |
3256 | ||
3257 | /* | |
3258 | * Returns 0 if current not found. | |
3259 | * Returns 1 if current found. | |
3260 | */ | |
3261 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) | |
3262 | { | |
3263 | struct module *iter_mod; | |
3264 | int found = 0; | |
3265 | ||
3266 | mutex_lock(&module_mutex); | |
3267 | list_for_each_entry(iter_mod, &modules, list) { | |
3268 | if (!iter_mod->taints) { | |
3269 | /* | |
3270 | * Sorted module list | |
3271 | */ | |
3272 | if (iter_mod < iter->module) | |
3273 | continue; | |
3274 | else if (iter_mod > iter->module) | |
3275 | iter->tracepoint = NULL; | |
3276 | found = tracepoint_get_iter_range(&iter->tracepoint, | |
3277 | iter_mod->tracepoints, | |
3278 | iter_mod->tracepoints | |
3279 | + iter_mod->num_tracepoints); | |
3280 | if (found) { | |
3281 | iter->module = iter_mod; | |
3282 | break; | |
3283 | } | |
3284 | } | |
3285 | } | |
3286 | mutex_unlock(&module_mutex); | |
3287 | return found; | |
3288 | } | |
3289 | #endif |