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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; | |
d913188c RR |
118 | unsigned long *strmap; |
119 | unsigned long symoffs, stroffs; | |
eded41c1 RR |
120 | struct { |
121 | unsigned int sym, str, mod, vers, info, pcpu; | |
122 | } index; | |
123 | }; | |
124 | ||
9a4b9708 ML |
125 | /* We require a truly strong try_module_get(): 0 means failure due to |
126 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
127 | static inline int strong_try_module_get(struct module *mod) |
128 | { | |
129 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
130 | return -EBUSY; |
131 | if (try_module_get(mod)) | |
1da177e4 | 132 | return 0; |
c9a3ba55 RR |
133 | else |
134 | return -ENOENT; | |
1da177e4 LT |
135 | } |
136 | ||
fa3ba2e8 FM |
137 | static inline void add_taint_module(struct module *mod, unsigned flag) |
138 | { | |
139 | add_taint(flag); | |
25ddbb18 | 140 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
141 | } |
142 | ||
02a3e59a RD |
143 | /* |
144 | * A thread that wants to hold a reference to a module only while it | |
145 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
146 | */ |
147 | void __module_put_and_exit(struct module *mod, long code) | |
148 | { | |
149 | module_put(mod); | |
150 | do_exit(code); | |
151 | } | |
152 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 153 | |
1da177e4 LT |
154 | /* Find a module section: 0 means not found. */ |
155 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
156 | Elf_Shdr *sechdrs, | |
157 | const char *secstrings, | |
158 | const char *name) | |
159 | { | |
160 | unsigned int i; | |
161 | ||
162 | for (i = 1; i < hdr->e_shnum; i++) | |
163 | /* Alloc bit cleared means "ignore it." */ | |
164 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
165 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
166 | return i; | |
167 | return 0; | |
168 | } | |
169 | ||
5e458cc0 RR |
170 | /* Find a module section, or NULL. */ |
171 | static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs, | |
172 | const char *secstrings, const char *name) | |
173 | { | |
174 | /* Section 0 has sh_addr 0. */ | |
175 | return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr; | |
176 | } | |
177 | ||
178 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
179 | static void *section_objs(Elf_Ehdr *hdr, | |
180 | Elf_Shdr *sechdrs, | |
181 | const char *secstrings, | |
182 | const char *name, | |
183 | size_t object_size, | |
184 | unsigned int *num) | |
185 | { | |
186 | unsigned int sec = find_sec(hdr, sechdrs, secstrings, name); | |
187 | ||
188 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
189 | *num = sechdrs[sec].sh_size / object_size; | |
190 | return (void *)sechdrs[sec].sh_addr; | |
191 | } | |
192 | ||
1da177e4 LT |
193 | /* Provided by the linker */ |
194 | extern const struct kernel_symbol __start___ksymtab[]; | |
195 | extern const struct kernel_symbol __stop___ksymtab[]; | |
196 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
197 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
198 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
199 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
200 | extern const unsigned long __start___kcrctab[]; |
201 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 202 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
203 | #ifdef CONFIG_UNUSED_SYMBOLS |
204 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
205 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
206 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
207 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
208 | extern const unsigned long __start___kcrctab_unused[]; |
209 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 210 | #endif |
1da177e4 LT |
211 | |
212 | #ifndef CONFIG_MODVERSIONS | |
213 | #define symversion(base, idx) NULL | |
214 | #else | |
f83ca9fe | 215 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
216 | #endif |
217 | ||
dafd0940 RR |
218 | static bool each_symbol_in_section(const struct symsearch *arr, |
219 | unsigned int arrsize, | |
220 | struct module *owner, | |
221 | bool (*fn)(const struct symsearch *syms, | |
222 | struct module *owner, | |
223 | unsigned int symnum, void *data), | |
224 | void *data) | |
ad9546c9 | 225 | { |
dafd0940 | 226 | unsigned int i, j; |
ad9546c9 | 227 | |
dafd0940 RR |
228 | for (j = 0; j < arrsize; j++) { |
229 | for (i = 0; i < arr[j].stop - arr[j].start; i++) | |
230 | if (fn(&arr[j], owner, i, data)) | |
231 | return true; | |
f71d20e9 | 232 | } |
dafd0940 RR |
233 | |
234 | return false; | |
ad9546c9 RR |
235 | } |
236 | ||
dafd0940 | 237 | /* Returns true as soon as fn returns true, otherwise false. */ |
c6b37801 TA |
238 | bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner, |
239 | unsigned int symnum, void *data), void *data) | |
ad9546c9 RR |
240 | { |
241 | struct module *mod; | |
44032e63 | 242 | static const struct symsearch arr[] = { |
ad9546c9 | 243 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 244 | NOT_GPL_ONLY, false }, |
ad9546c9 | 245 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
246 | __start___kcrctab_gpl, |
247 | GPL_ONLY, false }, | |
ad9546c9 | 248 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
249 | __start___kcrctab_gpl_future, |
250 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 251 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 252 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
253 | __start___kcrctab_unused, |
254 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 255 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
256 | __start___kcrctab_unused_gpl, |
257 | GPL_ONLY, true }, | |
f7f5b675 | 258 | #endif |
ad9546c9 | 259 | }; |
f71d20e9 | 260 | |
dafd0940 RR |
261 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
262 | return true; | |
f71d20e9 | 263 | |
d72b3751 | 264 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
265 | struct symsearch arr[] = { |
266 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 267 | NOT_GPL_ONLY, false }, |
ad9546c9 | 268 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
269 | mod->gpl_crcs, |
270 | GPL_ONLY, false }, | |
ad9546c9 RR |
271 | { mod->gpl_future_syms, |
272 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
273 | mod->gpl_future_crcs, |
274 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 275 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
276 | { mod->unused_syms, |
277 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
278 | mod->unused_crcs, |
279 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
280 | { mod->unused_gpl_syms, |
281 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
282 | mod->unused_gpl_crcs, |
283 | GPL_ONLY, true }, | |
f7f5b675 | 284 | #endif |
ad9546c9 RR |
285 | }; |
286 | ||
dafd0940 RR |
287 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
288 | return true; | |
289 | } | |
290 | return false; | |
291 | } | |
c6b37801 | 292 | EXPORT_SYMBOL_GPL(each_symbol); |
dafd0940 RR |
293 | |
294 | struct find_symbol_arg { | |
295 | /* Input */ | |
296 | const char *name; | |
297 | bool gplok; | |
298 | bool warn; | |
299 | ||
300 | /* Output */ | |
301 | struct module *owner; | |
302 | const unsigned long *crc; | |
414fd31b | 303 | const struct kernel_symbol *sym; |
dafd0940 RR |
304 | }; |
305 | ||
306 | static bool find_symbol_in_section(const struct symsearch *syms, | |
307 | struct module *owner, | |
308 | unsigned int symnum, void *data) | |
309 | { | |
310 | struct find_symbol_arg *fsa = data; | |
311 | ||
312 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) | |
313 | return false; | |
314 | ||
315 | if (!fsa->gplok) { | |
316 | if (syms->licence == GPL_ONLY) | |
317 | return false; | |
318 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
319 | printk(KERN_WARNING "Symbol %s is being used " | |
320 | "by a non-GPL module, which will not " | |
321 | "be allowed in the future\n", fsa->name); | |
322 | printk(KERN_WARNING "Please see the file " | |
323 | "Documentation/feature-removal-schedule.txt " | |
324 | "in the kernel source tree for more details.\n"); | |
9f28bb7e | 325 | } |
1da177e4 | 326 | } |
ad9546c9 | 327 | |
f7f5b675 | 328 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
329 | if (syms->unused && fsa->warn) { |
330 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
331 | "however this module is using it.\n", fsa->name); | |
332 | printk(KERN_WARNING | |
333 | "This symbol will go away in the future.\n"); | |
334 | printk(KERN_WARNING | |
335 | "Please evalute if this is the right api to use and if " | |
336 | "it really is, submit a report the linux kernel " | |
337 | "mailinglist together with submitting your code for " | |
338 | "inclusion.\n"); | |
339 | } | |
f7f5b675 | 340 | #endif |
dafd0940 RR |
341 | |
342 | fsa->owner = owner; | |
343 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 344 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
345 | return true; |
346 | } | |
347 | ||
414fd31b | 348 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 349 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
350 | const struct kernel_symbol *find_symbol(const char *name, |
351 | struct module **owner, | |
352 | const unsigned long **crc, | |
353 | bool gplok, | |
354 | bool warn) | |
dafd0940 RR |
355 | { |
356 | struct find_symbol_arg fsa; | |
357 | ||
358 | fsa.name = name; | |
359 | fsa.gplok = gplok; | |
360 | fsa.warn = warn; | |
361 | ||
362 | if (each_symbol(find_symbol_in_section, &fsa)) { | |
363 | if (owner) | |
364 | *owner = fsa.owner; | |
365 | if (crc) | |
366 | *crc = fsa.crc; | |
414fd31b | 367 | return fsa.sym; |
dafd0940 RR |
368 | } |
369 | ||
1da177e4 | 370 | DEBUGP("Failed to find symbol %s\n", name); |
414fd31b | 371 | return NULL; |
1da177e4 | 372 | } |
c6b37801 | 373 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 374 | |
1da177e4 | 375 | /* Search for module by name: must hold module_mutex. */ |
c6b37801 | 376 | struct module *find_module(const char *name) |
1da177e4 LT |
377 | { |
378 | struct module *mod; | |
379 | ||
380 | list_for_each_entry(mod, &modules, list) { | |
381 | if (strcmp(mod->name, name) == 0) | |
382 | return mod; | |
383 | } | |
384 | return NULL; | |
385 | } | |
c6b37801 | 386 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
387 | |
388 | #ifdef CONFIG_SMP | |
fbf59bc9 | 389 | |
259354de | 390 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 391 | { |
259354de TH |
392 | return mod->percpu; |
393 | } | |
fbf59bc9 | 394 | |
259354de TH |
395 | static int percpu_modalloc(struct module *mod, |
396 | unsigned long size, unsigned long align) | |
397 | { | |
fbf59bc9 TH |
398 | if (align > PAGE_SIZE) { |
399 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
259354de | 400 | mod->name, align, PAGE_SIZE); |
fbf59bc9 TH |
401 | align = PAGE_SIZE; |
402 | } | |
403 | ||
259354de TH |
404 | mod->percpu = __alloc_reserved_percpu(size, align); |
405 | if (!mod->percpu) { | |
fbf59bc9 | 406 | printk(KERN_WARNING |
d913188c RR |
407 | "%s: Could not allocate %lu bytes percpu data\n", |
408 | mod->name, size); | |
259354de TH |
409 | return -ENOMEM; |
410 | } | |
411 | mod->percpu_size = size; | |
412 | return 0; | |
fbf59bc9 TH |
413 | } |
414 | ||
259354de | 415 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 416 | { |
259354de | 417 | free_percpu(mod->percpu); |
fbf59bc9 TH |
418 | } |
419 | ||
6b588c18 TH |
420 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, |
421 | Elf_Shdr *sechdrs, | |
422 | const char *secstrings) | |
423 | { | |
3d9a854c | 424 | return find_sec(hdr, sechdrs, secstrings, ".data..percpu"); |
6b588c18 TH |
425 | } |
426 | ||
259354de TH |
427 | static void percpu_modcopy(struct module *mod, |
428 | const void *from, unsigned long size) | |
6b588c18 TH |
429 | { |
430 | int cpu; | |
431 | ||
432 | for_each_possible_cpu(cpu) | |
259354de | 433 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
434 | } |
435 | ||
10fad5e4 TH |
436 | /** |
437 | * is_module_percpu_address - test whether address is from module static percpu | |
438 | * @addr: address to test | |
439 | * | |
440 | * Test whether @addr belongs to module static percpu area. | |
441 | * | |
442 | * RETURNS: | |
443 | * %true if @addr is from module static percpu area | |
444 | */ | |
445 | bool is_module_percpu_address(unsigned long addr) | |
446 | { | |
447 | struct module *mod; | |
448 | unsigned int cpu; | |
449 | ||
450 | preempt_disable(); | |
451 | ||
452 | list_for_each_entry_rcu(mod, &modules, list) { | |
453 | if (!mod->percpu_size) | |
454 | continue; | |
455 | for_each_possible_cpu(cpu) { | |
456 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
457 | ||
458 | if ((void *)addr >= start && | |
459 | (void *)addr < start + mod->percpu_size) { | |
460 | preempt_enable(); | |
461 | return true; | |
462 | } | |
463 | } | |
464 | } | |
465 | ||
466 | preempt_enable(); | |
467 | return false; | |
6b588c18 TH |
468 | } |
469 | ||
1da177e4 | 470 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 471 | |
259354de | 472 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
473 | { |
474 | return NULL; | |
475 | } | |
259354de TH |
476 | static inline int percpu_modalloc(struct module *mod, |
477 | unsigned long size, unsigned long align) | |
478 | { | |
479 | return -ENOMEM; | |
480 | } | |
481 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 482 | { |
1da177e4 LT |
483 | } |
484 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
485 | Elf_Shdr *sechdrs, | |
486 | const char *secstrings) | |
487 | { | |
488 | return 0; | |
489 | } | |
259354de TH |
490 | static inline void percpu_modcopy(struct module *mod, |
491 | const void *from, unsigned long size) | |
1da177e4 LT |
492 | { |
493 | /* pcpusec should be 0, and size of that section should be 0. */ | |
494 | BUG_ON(size != 0); | |
495 | } | |
10fad5e4 TH |
496 | bool is_module_percpu_address(unsigned long addr) |
497 | { | |
498 | return false; | |
499 | } | |
6b588c18 | 500 | |
1da177e4 LT |
501 | #endif /* CONFIG_SMP */ |
502 | ||
c988d2b2 MD |
503 | #define MODINFO_ATTR(field) \ |
504 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
505 | { \ | |
506 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
507 | } \ | |
508 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
509 | struct module *mod, char *buffer) \ | |
510 | { \ | |
511 | return sprintf(buffer, "%s\n", mod->field); \ | |
512 | } \ | |
513 | static int modinfo_##field##_exists(struct module *mod) \ | |
514 | { \ | |
515 | return mod->field != NULL; \ | |
516 | } \ | |
517 | static void free_modinfo_##field(struct module *mod) \ | |
518 | { \ | |
22a8bdeb DW |
519 | kfree(mod->field); \ |
520 | mod->field = NULL; \ | |
c988d2b2 MD |
521 | } \ |
522 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 523 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
524 | .show = show_modinfo_##field, \ |
525 | .setup = setup_modinfo_##field, \ | |
526 | .test = modinfo_##field##_exists, \ | |
527 | .free = free_modinfo_##field, \ | |
528 | }; | |
529 | ||
530 | MODINFO_ATTR(version); | |
531 | MODINFO_ATTR(srcversion); | |
532 | ||
e14af7ee AV |
533 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
534 | ||
03e88ae1 | 535 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
536 | |
537 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
538 | ||
1da177e4 | 539 | /* Init the unload section of the module. */ |
9f85a4bb | 540 | static int module_unload_init(struct module *mod) |
1da177e4 | 541 | { |
9f85a4bb RR |
542 | mod->refptr = alloc_percpu(struct module_ref); |
543 | if (!mod->refptr) | |
544 | return -ENOMEM; | |
545 | ||
2c02dfe7 LT |
546 | INIT_LIST_HEAD(&mod->source_list); |
547 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 548 | |
1da177e4 | 549 | /* Hold reference count during initialization. */ |
5fbfb18d | 550 | __this_cpu_write(mod->refptr->incs, 1); |
1da177e4 LT |
551 | /* Backwards compatibility macros put refcount during init. */ |
552 | mod->waiter = current; | |
9f85a4bb RR |
553 | |
554 | return 0; | |
1da177e4 LT |
555 | } |
556 | ||
1da177e4 LT |
557 | /* Does a already use b? */ |
558 | static int already_uses(struct module *a, struct module *b) | |
559 | { | |
560 | struct module_use *use; | |
561 | ||
2c02dfe7 LT |
562 | list_for_each_entry(use, &b->source_list, source_list) { |
563 | if (use->source == a) { | |
1da177e4 LT |
564 | DEBUGP("%s uses %s!\n", a->name, b->name); |
565 | return 1; | |
566 | } | |
567 | } | |
568 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
569 | return 0; | |
570 | } | |
571 | ||
2c02dfe7 LT |
572 | /* |
573 | * Module a uses b | |
574 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
575 | * - the module_use is added to the list of 'b' sources (so | |
576 | * 'b' can walk the list to see who sourced them), and of 'a' | |
577 | * targets (so 'a' can see what modules it targets). | |
578 | */ | |
579 | static int add_module_usage(struct module *a, struct module *b) | |
580 | { | |
2c02dfe7 LT |
581 | struct module_use *use; |
582 | ||
583 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
584 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
585 | if (!use) { | |
586 | printk(KERN_WARNING "%s: out of memory loading\n", a->name); | |
587 | return -ENOMEM; | |
588 | } | |
589 | ||
590 | use->source = a; | |
591 | use->target = b; | |
592 | list_add(&use->source_list, &b->source_list); | |
593 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
594 | return 0; |
595 | } | |
596 | ||
75676500 | 597 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 598 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 599 | { |
c8e21ced | 600 | int err; |
270a6c4c | 601 | |
9bea7f23 | 602 | if (b == NULL || already_uses(a, b)) |
218ce735 | 603 | return 0; |
218ce735 | 604 | |
9bea7f23 RR |
605 | /* If module isn't available, we fail. */ |
606 | err = strong_try_module_get(b); | |
c9a3ba55 | 607 | if (err) |
9bea7f23 | 608 | return err; |
1da177e4 | 609 | |
2c02dfe7 LT |
610 | err = add_module_usage(a, b); |
611 | if (err) { | |
1da177e4 | 612 | module_put(b); |
9bea7f23 | 613 | return err; |
1da177e4 | 614 | } |
9bea7f23 | 615 | return 0; |
1da177e4 | 616 | } |
9bea7f23 | 617 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
618 | |
619 | /* Clear the unload stuff of the module. */ | |
620 | static void module_unload_free(struct module *mod) | |
621 | { | |
2c02dfe7 | 622 | struct module_use *use, *tmp; |
1da177e4 | 623 | |
75676500 | 624 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
625 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
626 | struct module *i = use->target; | |
627 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
628 | module_put(i); | |
629 | list_del(&use->source_list); | |
630 | list_del(&use->target_list); | |
631 | kfree(use); | |
1da177e4 | 632 | } |
75676500 | 633 | mutex_unlock(&module_mutex); |
9f85a4bb RR |
634 | |
635 | free_percpu(mod->refptr); | |
1da177e4 LT |
636 | } |
637 | ||
638 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 639 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
640 | { |
641 | int ret = (flags & O_TRUNC); | |
642 | if (ret) | |
fb169793 | 643 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
644 | return ret; |
645 | } | |
646 | #else | |
fb169793 | 647 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
648 | { |
649 | return 0; | |
650 | } | |
651 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
652 | ||
653 | struct stopref | |
654 | { | |
655 | struct module *mod; | |
656 | int flags; | |
657 | int *forced; | |
658 | }; | |
659 | ||
660 | /* Whole machine is stopped with interrupts off when this runs. */ | |
661 | static int __try_stop_module(void *_sref) | |
662 | { | |
663 | struct stopref *sref = _sref; | |
664 | ||
da39ba5e RR |
665 | /* If it's not unused, quit unless we're forcing. */ |
666 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 667 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
668 | return -EWOULDBLOCK; |
669 | } | |
670 | ||
671 | /* Mark it as dying. */ | |
672 | sref->mod->state = MODULE_STATE_GOING; | |
673 | return 0; | |
674 | } | |
675 | ||
676 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
677 | { | |
da39ba5e RR |
678 | if (flags & O_NONBLOCK) { |
679 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 680 | |
9b1a4d38 | 681 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
682 | } else { |
683 | /* We don't need to stop the machine for this. */ | |
684 | mod->state = MODULE_STATE_GOING; | |
685 | synchronize_sched(); | |
686 | return 0; | |
687 | } | |
1da177e4 LT |
688 | } |
689 | ||
690 | unsigned int module_refcount(struct module *mod) | |
691 | { | |
5fbfb18d | 692 | unsigned int incs = 0, decs = 0; |
720eba31 | 693 | int cpu; |
1da177e4 | 694 | |
720eba31 | 695 | for_each_possible_cpu(cpu) |
5fbfb18d NP |
696 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
697 | /* | |
698 | * ensure the incs are added up after the decs. | |
699 | * module_put ensures incs are visible before decs with smp_wmb. | |
700 | * | |
701 | * This 2-count scheme avoids the situation where the refcount | |
702 | * for CPU0 is read, then CPU0 increments the module refcount, | |
703 | * then CPU1 drops that refcount, then the refcount for CPU1 is | |
704 | * read. We would record a decrement but not its corresponding | |
705 | * increment so we would see a low count (disaster). | |
706 | * | |
707 | * Rare situation? But module_refcount can be preempted, and we | |
708 | * might be tallying up 4096+ CPUs. So it is not impossible. | |
709 | */ | |
710 | smp_rmb(); | |
711 | for_each_possible_cpu(cpu) | |
712 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; | |
713 | return incs - decs; | |
1da177e4 LT |
714 | } |
715 | EXPORT_SYMBOL(module_refcount); | |
716 | ||
717 | /* This exists whether we can unload or not */ | |
718 | static void free_module(struct module *mod); | |
719 | ||
720 | static void wait_for_zero_refcount(struct module *mod) | |
721 | { | |
a6550207 | 722 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 723 | mutex_unlock(&module_mutex); |
1da177e4 LT |
724 | for (;;) { |
725 | DEBUGP("Looking at refcount...\n"); | |
726 | set_current_state(TASK_UNINTERRUPTIBLE); | |
727 | if (module_refcount(mod) == 0) | |
728 | break; | |
729 | schedule(); | |
730 | } | |
731 | current->state = TASK_RUNNING; | |
6389a385 | 732 | mutex_lock(&module_mutex); |
1da177e4 LT |
733 | } |
734 | ||
17da2bd9 HC |
735 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
736 | unsigned int, flags) | |
1da177e4 LT |
737 | { |
738 | struct module *mod; | |
dfff0a06 | 739 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
740 | int ret, forced = 0; |
741 | ||
3d43321b | 742 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
743 | return -EPERM; |
744 | ||
745 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
746 | return -EFAULT; | |
747 | name[MODULE_NAME_LEN-1] = '\0'; | |
748 | ||
3fc1f1e2 TH |
749 | if (mutex_lock_interruptible(&module_mutex) != 0) |
750 | return -EINTR; | |
1da177e4 LT |
751 | |
752 | mod = find_module(name); | |
753 | if (!mod) { | |
754 | ret = -ENOENT; | |
755 | goto out; | |
756 | } | |
757 | ||
2c02dfe7 | 758 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
759 | /* Other modules depend on us: get rid of them first. */ |
760 | ret = -EWOULDBLOCK; | |
761 | goto out; | |
762 | } | |
763 | ||
764 | /* Doing init or already dying? */ | |
765 | if (mod->state != MODULE_STATE_LIVE) { | |
766 | /* FIXME: if (force), slam module count and wake up | |
767 | waiter --RR */ | |
768 | DEBUGP("%s already dying\n", mod->name); | |
769 | ret = -EBUSY; | |
770 | goto out; | |
771 | } | |
772 | ||
773 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 774 | if (mod->init && !mod->exit) { |
fb169793 | 775 | forced = try_force_unload(flags); |
1da177e4 LT |
776 | if (!forced) { |
777 | /* This module can't be removed */ | |
778 | ret = -EBUSY; | |
779 | goto out; | |
780 | } | |
781 | } | |
782 | ||
783 | /* Set this up before setting mod->state */ | |
784 | mod->waiter = current; | |
785 | ||
786 | /* Stop the machine so refcounts can't move and disable module. */ | |
787 | ret = try_stop_module(mod, flags, &forced); | |
788 | if (ret != 0) | |
789 | goto out; | |
790 | ||
791 | /* Never wait if forced. */ | |
792 | if (!forced && module_refcount(mod) != 0) | |
793 | wait_for_zero_refcount(mod); | |
794 | ||
df4b565e | 795 | mutex_unlock(&module_mutex); |
1da177e4 | 796 | /* Final destruction now noone is using it. */ |
df4b565e | 797 | if (mod->exit != NULL) |
1da177e4 | 798 | mod->exit(); |
df4b565e PO |
799 | blocking_notifier_call_chain(&module_notify_list, |
800 | MODULE_STATE_GOING, mod); | |
22a9d645 | 801 | async_synchronize_full(); |
75676500 | 802 | |
e14af7ee | 803 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 804 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 805 | |
75676500 RR |
806 | free_module(mod); |
807 | return 0; | |
808 | out: | |
6389a385 | 809 | mutex_unlock(&module_mutex); |
1da177e4 LT |
810 | return ret; |
811 | } | |
812 | ||
d1e99d7a | 813 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
814 | { |
815 | struct module_use *use; | |
816 | int printed_something = 0; | |
817 | ||
818 | seq_printf(m, " %u ", module_refcount(mod)); | |
819 | ||
820 | /* Always include a trailing , so userspace can differentiate | |
821 | between this and the old multi-field proc format. */ | |
2c02dfe7 | 822 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 823 | printed_something = 1; |
2c02dfe7 | 824 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
825 | } |
826 | ||
1da177e4 LT |
827 | if (mod->init != NULL && mod->exit == NULL) { |
828 | printed_something = 1; | |
829 | seq_printf(m, "[permanent],"); | |
830 | } | |
831 | ||
832 | if (!printed_something) | |
833 | seq_printf(m, "-"); | |
834 | } | |
835 | ||
836 | void __symbol_put(const char *symbol) | |
837 | { | |
838 | struct module *owner; | |
1da177e4 | 839 | |
24da1cbf | 840 | preempt_disable(); |
414fd31b | 841 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
842 | BUG(); |
843 | module_put(owner); | |
24da1cbf | 844 | preempt_enable(); |
1da177e4 LT |
845 | } |
846 | EXPORT_SYMBOL(__symbol_put); | |
847 | ||
7d1d16e4 | 848 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
849 | void symbol_put_addr(void *addr) |
850 | { | |
5e376613 | 851 | struct module *modaddr; |
7d1d16e4 | 852 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 853 | |
7d1d16e4 | 854 | if (core_kernel_text(a)) |
5e376613 | 855 | return; |
1da177e4 | 856 | |
a6e6abd5 RR |
857 | /* module_text_address is safe here: we're supposed to have reference |
858 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 859 | modaddr = __module_text_address(a); |
a6e6abd5 | 860 | BUG_ON(!modaddr); |
5e376613 | 861 | module_put(modaddr); |
1da177e4 LT |
862 | } |
863 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
864 | ||
865 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
866 | struct module *mod, char *buffer) | |
867 | { | |
256e2fdf | 868 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
869 | } |
870 | ||
871 | static struct module_attribute refcnt = { | |
7b595756 | 872 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
873 | .show = show_refcnt, |
874 | }; | |
875 | ||
f6a57033 AV |
876 | void module_put(struct module *module) |
877 | { | |
878 | if (module) { | |
e1783a24 | 879 | preempt_disable(); |
5fbfb18d NP |
880 | smp_wmb(); /* see comment in module_refcount */ |
881 | __this_cpu_inc(module->refptr->decs); | |
e1783a24 | 882 | |
ae832d1e | 883 | trace_module_put(module, _RET_IP_); |
f6a57033 AV |
884 | /* Maybe they're waiting for us to drop reference? */ |
885 | if (unlikely(!module_is_live(module))) | |
886 | wake_up_process(module->waiter); | |
e1783a24 | 887 | preempt_enable(); |
f6a57033 AV |
888 | } |
889 | } | |
890 | EXPORT_SYMBOL(module_put); | |
891 | ||
1da177e4 | 892 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 893 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
894 | { |
895 | /* We don't know the usage count, or what modules are using. */ | |
896 | seq_printf(m, " - -"); | |
897 | } | |
898 | ||
899 | static inline void module_unload_free(struct module *mod) | |
900 | { | |
901 | } | |
902 | ||
9bea7f23 | 903 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 904 | { |
9bea7f23 | 905 | return strong_try_module_get(b); |
1da177e4 | 906 | } |
9bea7f23 | 907 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 908 | |
9f85a4bb | 909 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 910 | { |
9f85a4bb | 911 | return 0; |
1da177e4 LT |
912 | } |
913 | #endif /* CONFIG_MODULE_UNLOAD */ | |
914 | ||
1f71740a KS |
915 | static ssize_t show_initstate(struct module_attribute *mattr, |
916 | struct module *mod, char *buffer) | |
917 | { | |
918 | const char *state = "unknown"; | |
919 | ||
920 | switch (mod->state) { | |
921 | case MODULE_STATE_LIVE: | |
922 | state = "live"; | |
923 | break; | |
924 | case MODULE_STATE_COMING: | |
925 | state = "coming"; | |
926 | break; | |
927 | case MODULE_STATE_GOING: | |
928 | state = "going"; | |
929 | break; | |
930 | } | |
931 | return sprintf(buffer, "%s\n", state); | |
932 | } | |
933 | ||
934 | static struct module_attribute initstate = { | |
7b595756 | 935 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
936 | .show = show_initstate, |
937 | }; | |
938 | ||
03e88ae1 GKH |
939 | static struct module_attribute *modinfo_attrs[] = { |
940 | &modinfo_version, | |
941 | &modinfo_srcversion, | |
1f71740a | 942 | &initstate, |
03e88ae1 GKH |
943 | #ifdef CONFIG_MODULE_UNLOAD |
944 | &refcnt, | |
945 | #endif | |
946 | NULL, | |
947 | }; | |
948 | ||
1da177e4 LT |
949 | static const char vermagic[] = VERMAGIC_STRING; |
950 | ||
c6e665c8 | 951 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
952 | { |
953 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 954 | if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8 RR |
955 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
956 | mod->name, reason); | |
826e4506 LT |
957 | add_taint_module(mod, TAINT_FORCED_MODULE); |
958 | return 0; | |
959 | #else | |
960 | return -ENOEXEC; | |
961 | #endif | |
962 | } | |
963 | ||
1da177e4 | 964 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
965 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
966 | static unsigned long maybe_relocated(unsigned long crc, | |
967 | const struct module *crc_owner) | |
968 | { | |
969 | #ifdef ARCH_RELOCATES_KCRCTAB | |
970 | if (crc_owner == NULL) | |
971 | return crc - (unsigned long)reloc_start; | |
972 | #endif | |
973 | return crc; | |
974 | } | |
975 | ||
1da177e4 LT |
976 | static int check_version(Elf_Shdr *sechdrs, |
977 | unsigned int versindex, | |
978 | const char *symname, | |
979 | struct module *mod, | |
d4703aef RR |
980 | const unsigned long *crc, |
981 | const struct module *crc_owner) | |
1da177e4 LT |
982 | { |
983 | unsigned int i, num_versions; | |
984 | struct modversion_info *versions; | |
985 | ||
986 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
987 | if (!crc) | |
988 | return 1; | |
989 | ||
a5dd6970 RR |
990 | /* No versions at all? modprobe --force does this. */ |
991 | if (versindex == 0) | |
992 | return try_to_force_load(mod, symname) == 0; | |
993 | ||
1da177e4 LT |
994 | versions = (void *) sechdrs[versindex].sh_addr; |
995 | num_versions = sechdrs[versindex].sh_size | |
996 | / sizeof(struct modversion_info); | |
997 | ||
998 | for (i = 0; i < num_versions; i++) { | |
999 | if (strcmp(versions[i].name, symname) != 0) | |
1000 | continue; | |
1001 | ||
d4703aef | 1002 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1003 | return 1; |
1da177e4 | 1004 | DEBUGP("Found checksum %lX vs module %lX\n", |
d4703aef | 1005 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1006 | goto bad_version; |
1da177e4 | 1007 | } |
826e4506 | 1008 | |
a5dd6970 RR |
1009 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1010 | mod->name, symname); | |
1011 | return 0; | |
826e4506 LT |
1012 | |
1013 | bad_version: | |
1014 | printk("%s: disagrees about version of symbol %s\n", | |
1015 | mod->name, symname); | |
1016 | return 0; | |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1020 | unsigned int versindex, | |
1021 | struct module *mod) | |
1022 | { | |
1023 | const unsigned long *crc; | |
1da177e4 | 1024 | |
75676500 RR |
1025 | /* Since this should be found in kernel (which can't be removed), |
1026 | * no locking is necessary. */ | |
6560dc16 MF |
1027 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
1028 | &crc, true, false)) | |
1da177e4 | 1029 | BUG(); |
d4703aef RR |
1030 | return check_version(sechdrs, versindex, "module_layout", mod, crc, |
1031 | NULL); | |
1da177e4 LT |
1032 | } |
1033 | ||
91e37a79 RR |
1034 | /* First part is kernel version, which we ignore if module has crcs. */ |
1035 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1036 | bool has_crcs) | |
1da177e4 | 1037 | { |
91e37a79 RR |
1038 | if (has_crcs) { |
1039 | amagic += strcspn(amagic, " "); | |
1040 | bmagic += strcspn(bmagic, " "); | |
1041 | } | |
1da177e4 LT |
1042 | return strcmp(amagic, bmagic) == 0; |
1043 | } | |
1044 | #else | |
1045 | static inline int check_version(Elf_Shdr *sechdrs, | |
1046 | unsigned int versindex, | |
1047 | const char *symname, | |
1048 | struct module *mod, | |
d4703aef RR |
1049 | const unsigned long *crc, |
1050 | const struct module *crc_owner) | |
1da177e4 LT |
1051 | { |
1052 | return 1; | |
1053 | } | |
1054 | ||
1055 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1056 | unsigned int versindex, | |
1057 | struct module *mod) | |
1058 | { | |
1059 | return 1; | |
1060 | } | |
1061 | ||
91e37a79 RR |
1062 | static inline int same_magic(const char *amagic, const char *bmagic, |
1063 | bool has_crcs) | |
1da177e4 LT |
1064 | { |
1065 | return strcmp(amagic, bmagic) == 0; | |
1066 | } | |
1067 | #endif /* CONFIG_MODVERSIONS */ | |
1068 | ||
75676500 | 1069 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
414fd31b TA |
1070 | static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs, |
1071 | unsigned int versindex, | |
1072 | const char *name, | |
9bea7f23 RR |
1073 | struct module *mod, |
1074 | char ownername[]) | |
1da177e4 LT |
1075 | { |
1076 | struct module *owner; | |
414fd31b | 1077 | const struct kernel_symbol *sym; |
1da177e4 | 1078 | const unsigned long *crc; |
9bea7f23 | 1079 | int err; |
1da177e4 | 1080 | |
75676500 | 1081 | mutex_lock(&module_mutex); |
414fd31b | 1082 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1083 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1084 | if (!sym) |
1085 | goto unlock; | |
1086 | ||
1087 | if (!check_version(sechdrs, versindex, name, mod, crc, owner)) { | |
1088 | sym = ERR_PTR(-EINVAL); | |
1089 | goto getname; | |
1da177e4 | 1090 | } |
9bea7f23 RR |
1091 | |
1092 | err = ref_module(mod, owner); | |
1093 | if (err) { | |
1094 | sym = ERR_PTR(err); | |
1095 | goto getname; | |
1096 | } | |
1097 | ||
1098 | getname: | |
1099 | /* We must make copy under the lock if we failed to get ref. */ | |
1100 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1101 | unlock: | |
75676500 | 1102 | mutex_unlock(&module_mutex); |
218ce735 | 1103 | return sym; |
1da177e4 LT |
1104 | } |
1105 | ||
9bea7f23 RR |
1106 | static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs, |
1107 | unsigned int versindex, | |
1108 | const char *name, | |
1109 | struct module *mod) | |
1110 | { | |
1111 | const struct kernel_symbol *ksym; | |
1112 | char ownername[MODULE_NAME_LEN]; | |
1113 | ||
1114 | if (wait_event_interruptible_timeout(module_wq, | |
1115 | !IS_ERR(ksym = resolve_symbol(sechdrs, versindex, name, | |
1116 | mod, ownername)) || | |
1117 | PTR_ERR(ksym) != -EBUSY, | |
1118 | 30 * HZ) <= 0) { | |
1119 | printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n", | |
1120 | mod->name, ownername); | |
1121 | } | |
1122 | return ksym; | |
1123 | } | |
1124 | ||
1da177e4 LT |
1125 | /* |
1126 | * /sys/module/foo/sections stuff | |
1127 | * J. Corbet <corbet@lwn.net> | |
1128 | */ | |
120fc3d7 | 1129 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
10b465aa BH |
1130 | |
1131 | static inline bool sect_empty(const Elf_Shdr *sect) | |
1132 | { | |
1133 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1134 | } | |
1135 | ||
a58730c4 RR |
1136 | struct module_sect_attr |
1137 | { | |
1138 | struct module_attribute mattr; | |
1139 | char *name; | |
1140 | unsigned long address; | |
1141 | }; | |
1142 | ||
1143 | struct module_sect_attrs | |
1144 | { | |
1145 | struct attribute_group grp; | |
1146 | unsigned int nsections; | |
1147 | struct module_sect_attr attrs[0]; | |
1148 | }; | |
1149 | ||
1da177e4 LT |
1150 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1151 | struct module *mod, char *buf) | |
1152 | { | |
1153 | struct module_sect_attr *sattr = | |
1154 | container_of(mattr, struct module_sect_attr, mattr); | |
1155 | return sprintf(buf, "0x%lx\n", sattr->address); | |
1156 | } | |
1157 | ||
04b1db9f IN |
1158 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1159 | { | |
a58730c4 | 1160 | unsigned int section; |
04b1db9f IN |
1161 | |
1162 | for (section = 0; section < sect_attrs->nsections; section++) | |
1163 | kfree(sect_attrs->attrs[section].name); | |
1164 | kfree(sect_attrs); | |
1165 | } | |
1166 | ||
1da177e4 LT |
1167 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1168 | char *secstrings, Elf_Shdr *sechdrs) | |
1169 | { | |
1170 | unsigned int nloaded = 0, i, size[2]; | |
1171 | struct module_sect_attrs *sect_attrs; | |
1172 | struct module_sect_attr *sattr; | |
1173 | struct attribute **gattr; | |
22a8bdeb | 1174 | |
1da177e4 LT |
1175 | /* Count loaded sections and allocate structures */ |
1176 | for (i = 0; i < nsect; i++) | |
10b465aa | 1177 | if (!sect_empty(&sechdrs[i])) |
1da177e4 LT |
1178 | nloaded++; |
1179 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1180 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1181 | sizeof(sect_attrs->grp.attrs[0])); | |
1182 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1183 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1184 | if (sect_attrs == NULL) | |
1da177e4 LT |
1185 | return; |
1186 | ||
1187 | /* Setup section attributes. */ | |
1188 | sect_attrs->grp.name = "sections"; | |
1189 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1190 | ||
04b1db9f | 1191 | sect_attrs->nsections = 0; |
1da177e4 LT |
1192 | sattr = §_attrs->attrs[0]; |
1193 | gattr = §_attrs->grp.attrs[0]; | |
1194 | for (i = 0; i < nsect; i++) { | |
10b465aa | 1195 | if (sect_empty(&sechdrs[i])) |
35dead42 | 1196 | continue; |
1da177e4 | 1197 | sattr->address = sechdrs[i].sh_addr; |
04b1db9f IN |
1198 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1199 | GFP_KERNEL); | |
1200 | if (sattr->name == NULL) | |
1201 | goto out; | |
1202 | sect_attrs->nsections++; | |
361795b1 | 1203 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1204 | sattr->mattr.show = module_sect_show; |
1205 | sattr->mattr.store = NULL; | |
1206 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1207 | sattr->mattr.attr.mode = S_IRUGO; |
1208 | *(gattr++) = &(sattr++)->mattr.attr; | |
1209 | } | |
1210 | *gattr = NULL; | |
1211 | ||
1212 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1213 | goto out; | |
1214 | ||
1215 | mod->sect_attrs = sect_attrs; | |
1216 | return; | |
1217 | out: | |
04b1db9f | 1218 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | static void remove_sect_attrs(struct module *mod) | |
1222 | { | |
1223 | if (mod->sect_attrs) { | |
1224 | sysfs_remove_group(&mod->mkobj.kobj, | |
1225 | &mod->sect_attrs->grp); | |
1226 | /* We are positive that no one is using any sect attrs | |
1227 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1228 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1229 | mod->sect_attrs = NULL; |
1230 | } | |
1231 | } | |
1232 | ||
6d760133 RM |
1233 | /* |
1234 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1235 | */ | |
1236 | ||
1237 | struct module_notes_attrs { | |
1238 | struct kobject *dir; | |
1239 | unsigned int notes; | |
1240 | struct bin_attribute attrs[0]; | |
1241 | }; | |
1242 | ||
2c3c8bea | 1243 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1244 | struct bin_attribute *bin_attr, |
1245 | char *buf, loff_t pos, size_t count) | |
1246 | { | |
1247 | /* | |
1248 | * The caller checked the pos and count against our size. | |
1249 | */ | |
1250 | memcpy(buf, bin_attr->private + pos, count); | |
1251 | return count; | |
1252 | } | |
1253 | ||
1254 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1255 | unsigned int i) | |
1256 | { | |
1257 | if (notes_attrs->dir) { | |
1258 | while (i-- > 0) | |
1259 | sysfs_remove_bin_file(notes_attrs->dir, | |
1260 | ¬es_attrs->attrs[i]); | |
e9432093 | 1261 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1262 | } |
1263 | kfree(notes_attrs); | |
1264 | } | |
1265 | ||
1266 | static void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1267 | char *secstrings, Elf_Shdr *sechdrs) | |
1268 | { | |
1269 | unsigned int notes, loaded, i; | |
1270 | struct module_notes_attrs *notes_attrs; | |
1271 | struct bin_attribute *nattr; | |
1272 | ||
ea6bff36 IM |
1273 | /* failed to create section attributes, so can't create notes */ |
1274 | if (!mod->sect_attrs) | |
1275 | return; | |
1276 | ||
6d760133 RM |
1277 | /* Count notes sections and allocate structures. */ |
1278 | notes = 0; | |
1279 | for (i = 0; i < nsect; i++) | |
10b465aa | 1280 | if (!sect_empty(&sechdrs[i]) && |
6d760133 RM |
1281 | (sechdrs[i].sh_type == SHT_NOTE)) |
1282 | ++notes; | |
1283 | ||
1284 | if (notes == 0) | |
1285 | return; | |
1286 | ||
1287 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1288 | + notes * sizeof(notes_attrs->attrs[0]), | |
1289 | GFP_KERNEL); | |
1290 | if (notes_attrs == NULL) | |
1291 | return; | |
1292 | ||
1293 | notes_attrs->notes = notes; | |
1294 | nattr = ¬es_attrs->attrs[0]; | |
1295 | for (loaded = i = 0; i < nsect; ++i) { | |
10b465aa | 1296 | if (sect_empty(&sechdrs[i])) |
6d760133 RM |
1297 | continue; |
1298 | if (sechdrs[i].sh_type == SHT_NOTE) { | |
361795b1 | 1299 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1300 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1301 | nattr->attr.mode = S_IRUGO; | |
1302 | nattr->size = sechdrs[i].sh_size; | |
1303 | nattr->private = (void *) sechdrs[i].sh_addr; | |
1304 | nattr->read = module_notes_read; | |
1305 | ++nattr; | |
1306 | } | |
1307 | ++loaded; | |
1308 | } | |
1309 | ||
4ff6abff | 1310 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1311 | if (!notes_attrs->dir) |
1312 | goto out; | |
1313 | ||
1314 | for (i = 0; i < notes; ++i) | |
1315 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1316 | ¬es_attrs->attrs[i])) | |
1317 | goto out; | |
1318 | ||
1319 | mod->notes_attrs = notes_attrs; | |
1320 | return; | |
1321 | ||
1322 | out: | |
1323 | free_notes_attrs(notes_attrs, i); | |
1324 | } | |
1325 | ||
1326 | static void remove_notes_attrs(struct module *mod) | |
1327 | { | |
1328 | if (mod->notes_attrs) | |
1329 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1330 | } | |
1331 | ||
1da177e4 | 1332 | #else |
04b1db9f | 1333 | |
1da177e4 LT |
1334 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1335 | char *sectstrings, Elf_Shdr *sechdrs) | |
1336 | { | |
1337 | } | |
1338 | ||
1339 | static inline void remove_sect_attrs(struct module *mod) | |
1340 | { | |
1341 | } | |
6d760133 RM |
1342 | |
1343 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1344 | char *sectstrings, Elf_Shdr *sechdrs) | |
1345 | { | |
1346 | } | |
1347 | ||
1348 | static inline void remove_notes_attrs(struct module *mod) | |
1349 | { | |
1350 | } | |
120fc3d7 | 1351 | #endif |
1da177e4 | 1352 | |
ef665c1a | 1353 | #ifdef CONFIG_SYSFS |
80a3d1bb RR |
1354 | static void add_usage_links(struct module *mod) |
1355 | { | |
1356 | #ifdef CONFIG_MODULE_UNLOAD | |
1357 | struct module_use *use; | |
1358 | int nowarn; | |
1359 | ||
75676500 | 1360 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1361 | list_for_each_entry(use, &mod->target_list, target_list) { |
1362 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1363 | &mod->mkobj.kobj, mod->name); | |
1364 | } | |
75676500 | 1365 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1366 | #endif |
1367 | } | |
1368 | ||
1369 | static void del_usage_links(struct module *mod) | |
1370 | { | |
1371 | #ifdef CONFIG_MODULE_UNLOAD | |
1372 | struct module_use *use; | |
1373 | ||
75676500 | 1374 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1375 | list_for_each_entry(use, &mod->target_list, target_list) |
1376 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1377 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1378 | #endif |
1379 | } | |
1380 | ||
6407ebb2 | 1381 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1382 | { |
1383 | struct module_attribute *attr; | |
03e88ae1 | 1384 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1385 | int error = 0; |
1386 | int i; | |
1387 | ||
03e88ae1 GKH |
1388 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1389 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1390 | GFP_KERNEL); | |
1391 | if (!mod->modinfo_attrs) | |
1392 | return -ENOMEM; | |
1393 | ||
1394 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1395 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1396 | if (!attr->test || | |
03e88ae1 GKH |
1397 | (attr->test && attr->test(mod))) { |
1398 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1399 | sysfs_attr_init(&temp_attr->attr); |
03e88ae1 GKH |
1400 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1401 | ++temp_attr; | |
1402 | } | |
c988d2b2 MD |
1403 | } |
1404 | return error; | |
1405 | } | |
1406 | ||
6407ebb2 | 1407 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1408 | { |
1409 | struct module_attribute *attr; | |
1410 | int i; | |
1411 | ||
03e88ae1 GKH |
1412 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1413 | /* pick a field to test for end of list */ | |
1414 | if (!attr->attr.name) | |
1415 | break; | |
c988d2b2 | 1416 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1417 | if (attr->free) |
1418 | attr->free(mod); | |
c988d2b2 | 1419 | } |
03e88ae1 | 1420 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1421 | } |
1da177e4 | 1422 | |
6407ebb2 | 1423 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1424 | { |
1425 | int err; | |
6494a93d | 1426 | struct kobject *kobj; |
1da177e4 | 1427 | |
823bccfc GKH |
1428 | if (!module_sysfs_initialized) { |
1429 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1430 | mod->name); |
1431 | err = -EINVAL; | |
1432 | goto out; | |
1433 | } | |
6494a93d GKH |
1434 | |
1435 | kobj = kset_find_obj(module_kset, mod->name); | |
1436 | if (kobj) { | |
1437 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1438 | kobject_put(kobj); | |
1439 | err = -EINVAL; | |
1440 | goto out; | |
1441 | } | |
1442 | ||
1da177e4 | 1443 | mod->mkobj.mod = mod; |
e17e0f51 | 1444 | |
ac3c8141 GKH |
1445 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1446 | mod->mkobj.kobj.kset = module_kset; | |
1447 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1448 | "%s", mod->name); | |
1449 | if (err) | |
1450 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1451 | |
97c146ef | 1452 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1453 | out: |
1454 | return err; | |
1455 | } | |
1456 | ||
6407ebb2 | 1457 | static int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1458 | struct kernel_param *kparam, |
1459 | unsigned int num_params) | |
1460 | { | |
1461 | int err; | |
1462 | ||
80a3d1bb RR |
1463 | err = mod_sysfs_init(mod); |
1464 | if (err) | |
1465 | goto out; | |
1466 | ||
4ff6abff | 1467 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1468 | if (!mod->holders_dir) { |
1469 | err = -ENOMEM; | |
270a6c4c | 1470 | goto out_unreg; |
240936e1 | 1471 | } |
270a6c4c | 1472 | |
1da177e4 LT |
1473 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1474 | if (err) | |
270a6c4c | 1475 | goto out_unreg_holders; |
1da177e4 | 1476 | |
c988d2b2 MD |
1477 | err = module_add_modinfo_attrs(mod); |
1478 | if (err) | |
e17e0f51 | 1479 | goto out_unreg_param; |
c988d2b2 | 1480 | |
80a3d1bb RR |
1481 | add_usage_links(mod); |
1482 | ||
e17e0f51 | 1483 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1484 | return 0; |
1485 | ||
e17e0f51 KS |
1486 | out_unreg_param: |
1487 | module_param_sysfs_remove(mod); | |
270a6c4c | 1488 | out_unreg_holders: |
78a2d906 | 1489 | kobject_put(mod->holders_dir); |
270a6c4c | 1490 | out_unreg: |
e17e0f51 | 1491 | kobject_put(&mod->mkobj.kobj); |
80a3d1bb | 1492 | out: |
1da177e4 LT |
1493 | return err; |
1494 | } | |
34e4e2fe DL |
1495 | |
1496 | static void mod_sysfs_fini(struct module *mod) | |
1497 | { | |
1498 | kobject_put(&mod->mkobj.kobj); | |
1499 | } | |
1500 | ||
1501 | #else /* CONFIG_SYSFS */ | |
1502 | ||
6407ebb2 RR |
1503 | static inline int mod_sysfs_init(struct module *mod) |
1504 | { | |
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | static inline int mod_sysfs_setup(struct module *mod, | |
1509 | struct kernel_param *kparam, | |
1510 | unsigned int num_params) | |
1511 | { | |
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | static inline int module_add_modinfo_attrs(struct module *mod) | |
1516 | { | |
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | static inline void module_remove_modinfo_attrs(struct module *mod) | |
1521 | { | |
1522 | } | |
1523 | ||
34e4e2fe DL |
1524 | static void mod_sysfs_fini(struct module *mod) |
1525 | { | |
1526 | } | |
1527 | ||
80a3d1bb RR |
1528 | static void del_usage_links(struct module *mod) |
1529 | { | |
1530 | } | |
1531 | ||
34e4e2fe | 1532 | #endif /* CONFIG_SYSFS */ |
1da177e4 LT |
1533 | |
1534 | static void mod_kobject_remove(struct module *mod) | |
1535 | { | |
80a3d1bb | 1536 | del_usage_links(mod); |
c988d2b2 | 1537 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1538 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1539 | kobject_put(mod->mkobj.drivers_dir); |
1540 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1541 | mod_sysfs_fini(mod); |
1da177e4 LT |
1542 | } |
1543 | ||
1544 | /* | |
1545 | * unlink the module with the whole machine is stopped with interrupts off | |
1546 | * - this defends against kallsyms not taking locks | |
1547 | */ | |
1548 | static int __unlink_module(void *_mod) | |
1549 | { | |
1550 | struct module *mod = _mod; | |
1551 | list_del(&mod->list); | |
1552 | return 0; | |
1553 | } | |
1554 | ||
75676500 | 1555 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1556 | static void free_module(struct module *mod) |
1557 | { | |
7ead8b83 LZ |
1558 | trace_module_free(mod); |
1559 | ||
1da177e4 | 1560 | /* Delete from various lists */ |
75676500 | 1561 | mutex_lock(&module_mutex); |
9b1a4d38 | 1562 | stop_machine(__unlink_module, mod, NULL); |
75676500 | 1563 | mutex_unlock(&module_mutex); |
6d760133 | 1564 | remove_notes_attrs(mod); |
1da177e4 LT |
1565 | remove_sect_attrs(mod); |
1566 | mod_kobject_remove(mod); | |
1567 | ||
b82bab4b JB |
1568 | /* Remove dynamic debug info */ |
1569 | ddebug_remove_module(mod->name); | |
1570 | ||
1da177e4 LT |
1571 | /* Arch-specific cleanup. */ |
1572 | module_arch_cleanup(mod); | |
1573 | ||
1574 | /* Module unload stuff */ | |
1575 | module_unload_free(mod); | |
1576 | ||
e180a6b7 RR |
1577 | /* Free any allocated parameters. */ |
1578 | destroy_params(mod->kp, mod->num_kp); | |
1579 | ||
1da177e4 LT |
1580 | /* This may be NULL, but that's OK */ |
1581 | module_free(mod, mod->module_init); | |
1582 | kfree(mod->args); | |
259354de | 1583 | percpu_modfree(mod); |
9f85a4bb | 1584 | |
fbb9ce95 IM |
1585 | /* Free lock-classes: */ |
1586 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1587 | ||
1da177e4 LT |
1588 | /* Finally, free the core (containing the module structure) */ |
1589 | module_free(mod, mod->module_core); | |
eb8cdec4 BS |
1590 | |
1591 | #ifdef CONFIG_MPU | |
1592 | update_protections(current->mm); | |
1593 | #endif | |
1da177e4 LT |
1594 | } |
1595 | ||
1596 | void *__symbol_get(const char *symbol) | |
1597 | { | |
1598 | struct module *owner; | |
414fd31b | 1599 | const struct kernel_symbol *sym; |
1da177e4 | 1600 | |
24da1cbf | 1601 | preempt_disable(); |
414fd31b TA |
1602 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1603 | if (sym && strong_try_module_get(owner)) | |
1604 | sym = NULL; | |
24da1cbf | 1605 | preempt_enable(); |
1da177e4 | 1606 | |
414fd31b | 1607 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1608 | } |
1609 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1610 | ||
eea8b54d AN |
1611 | /* |
1612 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1613 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1614 | * |
1615 | * You must hold the module_mutex. | |
eea8b54d AN |
1616 | */ |
1617 | static int verify_export_symbols(struct module *mod) | |
1618 | { | |
b211104d | 1619 | unsigned int i; |
eea8b54d | 1620 | struct module *owner; |
b211104d RR |
1621 | const struct kernel_symbol *s; |
1622 | struct { | |
1623 | const struct kernel_symbol *sym; | |
1624 | unsigned int num; | |
1625 | } arr[] = { | |
1626 | { mod->syms, mod->num_syms }, | |
1627 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1628 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1629 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1630 | { mod->unused_syms, mod->num_unused_syms }, |
1631 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1632 | #endif |
b211104d | 1633 | }; |
eea8b54d | 1634 | |
b211104d RR |
1635 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1636 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 1637 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d RR |
1638 | printk(KERN_ERR |
1639 | "%s: exports duplicate symbol %s" | |
1640 | " (owned by %s)\n", | |
1641 | mod->name, s->name, module_name(owner)); | |
1642 | return -ENOEXEC; | |
1643 | } | |
eea8b54d | 1644 | } |
b211104d RR |
1645 | } |
1646 | return 0; | |
eea8b54d AN |
1647 | } |
1648 | ||
9a4b9708 | 1649 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4 LT |
1650 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1651 | unsigned int symindex, | |
1652 | const char *strtab, | |
1653 | unsigned int versindex, | |
1654 | unsigned int pcpuindex, | |
1655 | struct module *mod) | |
1656 | { | |
1657 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1658 | unsigned long secbase; | |
1659 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1660 | int ret = 0; | |
414fd31b | 1661 | const struct kernel_symbol *ksym; |
1da177e4 LT |
1662 | |
1663 | for (i = 1; i < n; i++) { | |
1664 | switch (sym[i].st_shndx) { | |
1665 | case SHN_COMMON: | |
1666 | /* We compiled with -fno-common. These are not | |
1667 | supposed to happen. */ | |
1668 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1669 | printk("%s: please compile with -fno-common\n", | |
1670 | mod->name); | |
1671 | ret = -ENOEXEC; | |
1672 | break; | |
1673 | ||
1674 | case SHN_ABS: | |
1675 | /* Don't need to do anything */ | |
1676 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1677 | (long)sym[i].st_value); | |
1678 | break; | |
1679 | ||
1680 | case SHN_UNDEF: | |
9bea7f23 RR |
1681 | ksym = resolve_symbol_wait(sechdrs, versindex, |
1682 | strtab + sym[i].st_name, | |
1683 | mod); | |
1da177e4 | 1684 | /* Ok if resolved. */ |
9bea7f23 | 1685 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 1686 | sym[i].st_value = ksym->value; |
1da177e4 | 1687 | break; |
414fd31b TA |
1688 | } |
1689 | ||
1da177e4 | 1690 | /* Ok if weak. */ |
9bea7f23 | 1691 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
1692 | break; |
1693 | ||
9bea7f23 RR |
1694 | printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n", |
1695 | mod->name, strtab + sym[i].st_name, | |
1696 | PTR_ERR(ksym)); | |
1697 | ret = PTR_ERR(ksym) ?: -ENOENT; | |
1da177e4 LT |
1698 | break; |
1699 | ||
1700 | default: | |
1701 | /* Divert to percpu allocation if a percpu var. */ | |
1702 | if (sym[i].st_shndx == pcpuindex) | |
259354de | 1703 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 LT |
1704 | else |
1705 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1706 | sym[i].st_value += secbase; | |
1707 | break; | |
1708 | } | |
1709 | } | |
1710 | ||
1711 | return ret; | |
1712 | } | |
1713 | ||
22e268eb RR |
1714 | static int apply_relocations(struct module *mod, |
1715 | Elf_Ehdr *hdr, | |
1716 | Elf_Shdr *sechdrs, | |
1717 | unsigned int symindex, | |
1718 | unsigned int strindex) | |
1719 | { | |
1720 | unsigned int i; | |
1721 | int err = 0; | |
1722 | ||
1723 | /* Now do relocations. */ | |
1724 | for (i = 1; i < hdr->e_shnum; i++) { | |
1725 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
1726 | unsigned int info = sechdrs[i].sh_info; | |
1727 | ||
1728 | /* Not a valid relocation section? */ | |
1729 | if (info >= hdr->e_shnum) | |
1730 | continue; | |
1731 | ||
1732 | /* Don't bother with non-allocated sections */ | |
1733 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
1734 | continue; | |
1735 | ||
1736 | if (sechdrs[i].sh_type == SHT_REL) | |
1737 | err = apply_relocate(sechdrs, strtab, symindex, i, mod); | |
1738 | else if (sechdrs[i].sh_type == SHT_RELA) | |
1739 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
1740 | mod); | |
1741 | if (err < 0) | |
1742 | break; | |
1743 | } | |
1744 | return err; | |
1745 | } | |
1746 | ||
088af9a6 HD |
1747 | /* Additional bytes needed by arch in front of individual sections */ |
1748 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1749 | unsigned int section) | |
1750 | { | |
1751 | /* default implementation just returns zero */ | |
1752 | return 0; | |
1753 | } | |
1754 | ||
1da177e4 | 1755 | /* Update size with this section: return offset. */ |
088af9a6 HD |
1756 | static long get_offset(struct module *mod, unsigned int *size, |
1757 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
1758 | { |
1759 | long ret; | |
1760 | ||
088af9a6 | 1761 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1762 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1763 | *size = ret + sechdr->sh_size; | |
1764 | return ret; | |
1765 | } | |
1766 | ||
1767 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1768 | might -- code, read-only data, read-write data, small data. Tally | |
1769 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1770 | belongs in init. */ | |
1771 | static void layout_sections(struct module *mod, | |
1772 | const Elf_Ehdr *hdr, | |
1773 | Elf_Shdr *sechdrs, | |
1774 | const char *secstrings) | |
1775 | { | |
1776 | static unsigned long const masks[][2] = { | |
1777 | /* NOTE: all executable code must be the first section | |
1778 | * in this array; otherwise modify the text_size | |
1779 | * finder in the two loops below */ | |
1780 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1781 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1782 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1783 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1784 | }; | |
1785 | unsigned int m, i; | |
1786 | ||
1787 | for (i = 0; i < hdr->e_shnum; i++) | |
1788 | sechdrs[i].sh_entsize = ~0UL; | |
1789 | ||
1790 | DEBUGP("Core section allocation order:\n"); | |
1791 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1792 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1793 | Elf_Shdr *s = &sechdrs[i]; | |
1794 | ||
1795 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1796 | || (s->sh_flags & masks[m][1]) | |
1797 | || s->sh_entsize != ~0UL | |
49502677 | 1798 | || strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1799 | continue; |
088af9a6 | 1800 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
1da177e4 LT |
1801 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
1802 | } | |
1803 | if (m == 0) | |
1804 | mod->core_text_size = mod->core_size; | |
1805 | } | |
1806 | ||
1807 | DEBUGP("Init section allocation order:\n"); | |
1808 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1809 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1810 | Elf_Shdr *s = &sechdrs[i]; | |
1811 | ||
1812 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1813 | || (s->sh_flags & masks[m][1]) | |
1814 | || s->sh_entsize != ~0UL | |
49502677 | 1815 | || !strstarts(secstrings + s->sh_name, ".init")) |
1da177e4 | 1816 | continue; |
088af9a6 | 1817 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 LT |
1818 | | INIT_OFFSET_MASK); |
1819 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1820 | } | |
1821 | if (m == 0) | |
1822 | mod->init_text_size = mod->init_size; | |
1823 | } | |
1824 | } | |
1825 | ||
1da177e4 LT |
1826 | static void set_license(struct module *mod, const char *license) |
1827 | { | |
1828 | if (!license) | |
1829 | license = "unspecified"; | |
1830 | ||
fa3ba2e8 | 1831 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1832 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 1833 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1834 | "kernel.\n", mod->name, license); |
1835 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1836 | } |
1837 | } | |
1838 | ||
1839 | /* Parse tag=value strings from .modinfo section */ | |
1840 | static char *next_string(char *string, unsigned long *secsize) | |
1841 | { | |
1842 | /* Skip non-zero chars */ | |
1843 | while (string[0]) { | |
1844 | string++; | |
1845 | if ((*secsize)-- <= 1) | |
1846 | return NULL; | |
1847 | } | |
1848 | ||
1849 | /* Skip any zero padding. */ | |
1850 | while (!string[0]) { | |
1851 | string++; | |
1852 | if ((*secsize)-- <= 1) | |
1853 | return NULL; | |
1854 | } | |
1855 | return string; | |
1856 | } | |
1857 | ||
40dd2560 | 1858 | static char *get_modinfo(const Elf_Shdr *sechdrs, |
1da177e4 LT |
1859 | unsigned int info, |
1860 | const char *tag) | |
1861 | { | |
1862 | char *p; | |
1863 | unsigned int taglen = strlen(tag); | |
1864 | unsigned long size = sechdrs[info].sh_size; | |
1865 | ||
1866 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1867 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1868 | return p + taglen + 1; | |
1869 | } | |
1870 | return NULL; | |
1871 | } | |
1872 | ||
c988d2b2 MD |
1873 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1874 | unsigned int infoindex) | |
1875 | { | |
1876 | struct module_attribute *attr; | |
1877 | int i; | |
1878 | ||
1879 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1880 | if (attr->setup) | |
1881 | attr->setup(mod, | |
1882 | get_modinfo(sechdrs, | |
1883 | infoindex, | |
1884 | attr->attr.name)); | |
1885 | } | |
1886 | } | |
c988d2b2 | 1887 | |
a263f776 RR |
1888 | static void free_modinfo(struct module *mod) |
1889 | { | |
1890 | struct module_attribute *attr; | |
1891 | int i; | |
1892 | ||
1893 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1894 | if (attr->free) | |
1895 | attr->free(mod); | |
1896 | } | |
1897 | } | |
1898 | ||
1da177e4 | 1899 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
1900 | |
1901 | /* lookup symbol in given range of kernel_symbols */ | |
1902 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
1903 | const struct kernel_symbol *start, | |
1904 | const struct kernel_symbol *stop) | |
1905 | { | |
1906 | const struct kernel_symbol *ks = start; | |
1907 | for (; ks < stop; ks++) | |
1908 | if (strcmp(ks->name, name) == 0) | |
1909 | return ks; | |
1910 | return NULL; | |
1911 | } | |
1912 | ||
ca4787b7 TA |
1913 | static int is_exported(const char *name, unsigned long value, |
1914 | const struct module *mod) | |
1da177e4 | 1915 | { |
ca4787b7 TA |
1916 | const struct kernel_symbol *ks; |
1917 | if (!mod) | |
1918 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 1919 | else |
ca4787b7 TA |
1920 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
1921 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
1922 | } |
1923 | ||
1924 | /* As per nm */ | |
eded41c1 | 1925 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 1926 | { |
eded41c1 RR |
1927 | const Elf_Shdr *sechdrs = info->sechdrs; |
1928 | ||
1da177e4 LT |
1929 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
1930 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1931 | return 'v'; | |
1932 | else | |
1933 | return 'w'; | |
1934 | } | |
1935 | if (sym->st_shndx == SHN_UNDEF) | |
1936 | return 'U'; | |
1937 | if (sym->st_shndx == SHN_ABS) | |
1938 | return 'a'; | |
1939 | if (sym->st_shndx >= SHN_LORESERVE) | |
1940 | return '?'; | |
1941 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1942 | return 't'; | |
1943 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1944 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1945 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1946 | return 'r'; | |
1947 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1948 | return 'g'; | |
1949 | else | |
1950 | return 'd'; | |
1951 | } | |
1952 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1953 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1954 | return 's'; | |
1955 | else | |
1956 | return 'b'; | |
1957 | } | |
eded41c1 RR |
1958 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
1959 | ".debug")) { | |
1da177e4 | 1960 | return 'n'; |
eded41c1 | 1961 | } |
1da177e4 LT |
1962 | return '?'; |
1963 | } | |
1964 | ||
4a496226 JB |
1965 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
1966 | unsigned int shnum) | |
1967 | { | |
1968 | const Elf_Shdr *sec; | |
1969 | ||
1970 | if (src->st_shndx == SHN_UNDEF | |
1971 | || src->st_shndx >= shnum | |
1972 | || !src->st_name) | |
1973 | return false; | |
1974 | ||
1975 | sec = sechdrs + src->st_shndx; | |
1976 | if (!(sec->sh_flags & SHF_ALLOC) | |
1977 | #ifndef CONFIG_KALLSYMS_ALL | |
1978 | || !(sec->sh_flags & SHF_EXECINSTR) | |
1979 | #endif | |
1980 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
1981 | return false; | |
1982 | ||
1983 | return true; | |
1984 | } | |
1985 | ||
1986 | static unsigned long layout_symtab(struct module *mod, | |
1987 | Elf_Shdr *sechdrs, | |
1988 | unsigned int symindex, | |
554bdfe5 | 1989 | unsigned int strindex, |
4a496226 | 1990 | const Elf_Ehdr *hdr, |
554bdfe5 JB |
1991 | const char *secstrings, |
1992 | unsigned long *pstroffs, | |
1993 | unsigned long *strmap) | |
4a496226 JB |
1994 | { |
1995 | unsigned long symoffs; | |
1996 | Elf_Shdr *symsect = sechdrs + symindex; | |
554bdfe5 | 1997 | Elf_Shdr *strsect = sechdrs + strindex; |
4a496226 | 1998 | const Elf_Sym *src; |
554bdfe5 | 1999 | const char *strtab; |
4a496226 JB |
2000 | unsigned int i, nsrc, ndst; |
2001 | ||
2002 | /* Put symbol section at end of init part of module. */ | |
2003 | symsect->sh_flags |= SHF_ALLOC; | |
2004 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
2005 | symindex) | INIT_OFFSET_MASK; | |
2006 | DEBUGP("\t%s\n", secstrings + symsect->sh_name); | |
2007 | ||
2008 | src = (void *)hdr + symsect->sh_offset; | |
2009 | nsrc = symsect->sh_size / sizeof(*src); | |
554bdfe5 | 2010 | strtab = (void *)hdr + strsect->sh_offset; |
4a496226 | 2011 | for (ndst = i = 1; i < nsrc; ++i, ++src) |
554bdfe5 JB |
2012 | if (is_core_symbol(src, sechdrs, hdr->e_shnum)) { |
2013 | unsigned int j = src->st_name; | |
2014 | ||
2015 | while(!__test_and_set_bit(j, strmap) && strtab[j]) | |
2016 | ++j; | |
4a496226 | 2017 | ++ndst; |
554bdfe5 | 2018 | } |
4a496226 JB |
2019 | |
2020 | /* Append room for core symbols at end of core part. */ | |
2021 | symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); | |
2022 | mod->core_size = symoffs + ndst * sizeof(Elf_Sym); | |
2023 | ||
554bdfe5 JB |
2024 | /* Put string table section at end of init part of module. */ |
2025 | strsect->sh_flags |= SHF_ALLOC; | |
2026 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
2027 | strindex) | INIT_OFFSET_MASK; | |
2028 | DEBUGP("\t%s\n", secstrings + strsect->sh_name); | |
2029 | ||
2030 | /* Append room for core symbols' strings at end of core part. */ | |
2031 | *pstroffs = mod->core_size; | |
2032 | __set_bit(0, strmap); | |
2033 | mod->core_size += bitmap_weight(strmap, strsect->sh_size); | |
2034 | ||
4a496226 JB |
2035 | return symoffs; |
2036 | } | |
2037 | ||
d913188c | 2038 | static void add_kallsyms(struct module *mod, struct load_info *info) |
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); | |
511ca6ae RR |
2048 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2049 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2050 | |
2051 | /* Set types up while we still have access to sections. */ | |
2052 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2053 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2054 | |
d913188c | 2055 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
4a496226 JB |
2056 | src = mod->symtab; |
2057 | *dst = *src; | |
2058 | for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { | |
eded41c1 | 2059 | if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) |
4a496226 JB |
2060 | continue; |
2061 | dst[ndst] = *src; | |
d913188c RR |
2062 | dst[ndst].st_name = bitmap_weight(info->strmap, |
2063 | dst[ndst].st_name); | |
4a496226 JB |
2064 | ++ndst; |
2065 | } | |
2066 | mod->core_num_syms = ndst; | |
554bdfe5 | 2067 | |
d913188c | 2068 | mod->core_strtab = s = mod->module_core + info->stroffs; |
eded41c1 | 2069 | for (*s = 0, i = 1; i < info->sechdrs[info->index.str].sh_size; ++i) |
d913188c | 2070 | if (test_bit(i, info->strmap)) |
554bdfe5 | 2071 | *++s = mod->strtab[i]; |
1da177e4 LT |
2072 | } |
2073 | #else | |
4a496226 JB |
2074 | static inline unsigned long layout_symtab(struct module *mod, |
2075 | Elf_Shdr *sechdrs, | |
2076 | unsigned int symindex, | |
554bdfe5 | 2077 | unsigned int strindex, |
3ae91c21 | 2078 | const Elf_Ehdr *hdr, |
554bdfe5 JB |
2079 | const char *secstrings, |
2080 | unsigned long *pstroffs, | |
2081 | unsigned long *strmap) | |
4a496226 | 2082 | { |
3ae91c21 | 2083 | return 0; |
4a496226 | 2084 | } |
3ae91c21 | 2085 | |
d913188c | 2086 | static void add_kallsyms(struct module *mod, struct load_info *info) |
1da177e4 LT |
2087 | { |
2088 | } | |
2089 | #endif /* CONFIG_KALLSYMS */ | |
2090 | ||
e9d376f0 | 2091 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2092 | { |
e9d376f0 JB |
2093 | #ifdef CONFIG_DYNAMIC_DEBUG |
2094 | if (ddebug_add_module(debug, num, debug->modname)) | |
2095 | printk(KERN_ERR "dynamic debug error adding module: %s\n", | |
2096 | debug->modname); | |
2097 | #endif | |
5e458cc0 | 2098 | } |
346e15be | 2099 | |
ff49d74a YS |
2100 | static void dynamic_debug_remove(struct _ddebug *debug) |
2101 | { | |
2102 | if (debug) | |
2103 | ddebug_remove_module(debug->modname); | |
2104 | } | |
2105 | ||
3a642e99 RR |
2106 | static void *module_alloc_update_bounds(unsigned long size) |
2107 | { | |
2108 | void *ret = module_alloc(size); | |
2109 | ||
2110 | if (ret) { | |
75676500 | 2111 | mutex_lock(&module_mutex); |
3a642e99 RR |
2112 | /* Update module bounds. */ |
2113 | if ((unsigned long)ret < module_addr_min) | |
2114 | module_addr_min = (unsigned long)ret; | |
2115 | if ((unsigned long)ret + size > module_addr_max) | |
2116 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2117 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2118 | } |
2119 | return ret; | |
2120 | } | |
2121 | ||
4f2294b6 CM |
2122 | #ifdef CONFIG_DEBUG_KMEMLEAK |
2123 | static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
65b8a9b4 LT |
2124 | const Elf_Shdr *sechdrs, |
2125 | const char *secstrings) | |
4f2294b6 CM |
2126 | { |
2127 | unsigned int i; | |
2128 | ||
2129 | /* only scan the sections containing data */ | |
c017b4be | 2130 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 CM |
2131 | |
2132 | for (i = 1; i < hdr->e_shnum; i++) { | |
2133 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2134 | continue; | |
2135 | if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0 | |
2136 | && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0) | |
2137 | continue; | |
2138 | ||
c017b4be | 2139 | kmemleak_scan_area((void *)sechdrs[i].sh_addr, |
4f2294b6 CM |
2140 | sechdrs[i].sh_size, GFP_KERNEL); |
2141 | } | |
2142 | } | |
2143 | #else | |
2144 | static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, | |
65b8a9b4 LT |
2145 | Elf_Shdr *sechdrs, |
2146 | const char *secstrings) | |
4f2294b6 CM |
2147 | { |
2148 | } | |
2149 | #endif | |
2150 | ||
d913188c RR |
2151 | /* Sets info->hdr, info->len and info->args. */ |
2152 | static int copy_and_check(struct load_info *info, | |
2153 | const void __user *umod, unsigned long len, | |
2154 | const char __user *uargs) | |
40dd2560 RR |
2155 | { |
2156 | int err; | |
2157 | Elf_Ehdr *hdr; | |
2158 | ||
2159 | if (len < sizeof(*hdr)) | |
2160 | return -ENOEXEC; | |
2161 | ||
2162 | /* Suck in entire file: we'll want most of it. */ | |
2163 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
3264d3f9 | 2164 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) |
40dd2560 RR |
2165 | return -ENOMEM; |
2166 | ||
2167 | if (copy_from_user(hdr, umod, len) != 0) { | |
2168 | err = -EFAULT; | |
2169 | goto free_hdr; | |
2170 | } | |
2171 | ||
2172 | /* Sanity checks against insmoding binaries or wrong arch, | |
2173 | weird elf version */ | |
2174 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2175 | || hdr->e_type != ET_REL | |
2176 | || !elf_check_arch(hdr) | |
2177 | || hdr->e_shentsize != sizeof(Elf_Shdr)) { | |
2178 | err = -ENOEXEC; | |
2179 | goto free_hdr; | |
2180 | } | |
2181 | ||
2182 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { | |
2183 | err = -ENOEXEC; | |
2184 | goto free_hdr; | |
2185 | } | |
d913188c RR |
2186 | |
2187 | /* Now copy in args */ | |
2188 | info->args = strndup_user(uargs, ~0UL >> 1); | |
2189 | if (IS_ERR(info->args)) { | |
2190 | err = PTR_ERR(info->args); | |
2191 | goto free_hdr; | |
2192 | } | |
2193 | ||
3264d3f9 LT |
2194 | info->hdr = hdr; |
2195 | info->len = len; | |
40dd2560 RR |
2196 | return 0; |
2197 | ||
2198 | free_hdr: | |
2199 | vfree(hdr); | |
2200 | return err; | |
2201 | } | |
2202 | ||
d913188c RR |
2203 | static void free_copy(struct load_info *info) |
2204 | { | |
2205 | kfree(info->args); | |
2206 | vfree(info->hdr); | |
2207 | } | |
2208 | ||
8b5f61a7 RR |
2209 | static int rewrite_section_headers(struct load_info *info) |
2210 | { | |
2211 | unsigned int i; | |
2212 | ||
2213 | /* This should always be true, but let's be sure. */ | |
2214 | info->sechdrs[0].sh_addr = 0; | |
2215 | ||
2216 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2217 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2218 | if (shdr->sh_type != SHT_NOBITS | |
2219 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
2220 | printk(KERN_ERR "Module len %lu truncated\n", | |
2221 | info->len); | |
2222 | return -ENOEXEC; | |
2223 | } | |
2224 | ||
2225 | /* Mark all sections sh_addr with their address in the | |
2226 | temporary image. */ | |
2227 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2228 | ||
2229 | #ifndef CONFIG_MODULE_UNLOAD | |
2230 | /* Don't load .exit sections */ | |
2231 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2232 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2233 | #endif | |
8b5f61a7 | 2234 | } |
d6df72a0 RR |
2235 | |
2236 | /* Track but don't keep modinfo and version sections. */ | |
2237 | info->index.vers = find_sec(info->hdr, info->sechdrs, info->secstrings, "__versions"); | |
2238 | info->index.info = find_sec(info->hdr, info->sechdrs, info->secstrings, ".modinfo"); | |
2239 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2240 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2241 | return 0; |
2242 | } | |
2243 | ||
3264d3f9 LT |
2244 | /* |
2245 | * Set up our basic convenience variables (pointers to section headers, | |
2246 | * search for module section index etc), and do some basic section | |
2247 | * verification. | |
2248 | * | |
2249 | * Return the temporary module pointer (we'll replace it with the final | |
2250 | * one when we move the module sections around). | |
2251 | */ | |
2252 | static struct module *setup_load_info(struct load_info *info) | |
2253 | { | |
2254 | unsigned int i; | |
8b5f61a7 | 2255 | int err; |
3264d3f9 LT |
2256 | struct module *mod; |
2257 | ||
2258 | /* Set up the convenience variables */ | |
2259 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2260 | info->secstrings = (void *)info->hdr |
2261 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2262 | |
8b5f61a7 RR |
2263 | err = rewrite_section_headers(info); |
2264 | if (err) | |
2265 | return ERR_PTR(err); | |
3264d3f9 | 2266 | |
8b5f61a7 RR |
2267 | /* Find internal symbols and strings. */ |
2268 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2269 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2270 | info->index.sym = i; | |
2271 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2272 | info->strtab = (char *)info->hdr |
2273 | + info->sechdrs[info->index.str].sh_offset; | |
2274 | break; | |
3264d3f9 | 2275 | } |
3264d3f9 LT |
2276 | } |
2277 | ||
2278 | info->index.mod = find_sec(info->hdr, info->sechdrs, info->secstrings, | |
2279 | ".gnu.linkonce.this_module"); | |
2280 | if (!info->index.mod) { | |
2281 | printk(KERN_WARNING "No module found in object\n"); | |
2282 | return ERR_PTR(-ENOEXEC); | |
2283 | } | |
2284 | /* This is temporary: point mod into copy of data. */ | |
2285 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2286 | ||
2287 | if (info->index.sym == 0) { | |
2288 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
2289 | mod->name); | |
2290 | return ERR_PTR(-ENOEXEC); | |
2291 | } | |
2292 | ||
3264d3f9 LT |
2293 | info->index.pcpu = find_pcpusec(info->hdr, info->sechdrs, info->secstrings); |
2294 | ||
3264d3f9 LT |
2295 | /* Check module struct version now, before we try to use module. */ |
2296 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2297 | return ERR_PTR(-ENOEXEC); | |
2298 | ||
2299 | return mod; | |
3264d3f9 LT |
2300 | } |
2301 | ||
40dd2560 RR |
2302 | static int check_modinfo(struct module *mod, |
2303 | const Elf_Shdr *sechdrs, | |
2304 | unsigned int infoindex, unsigned int versindex) | |
2305 | { | |
2306 | const char *modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
2307 | int err; | |
2308 | ||
2309 | /* This is allowed: modprobe --force will invalidate it. */ | |
2310 | if (!modmagic) { | |
2311 | err = try_to_force_load(mod, "bad vermagic"); | |
2312 | if (err) | |
2313 | return err; | |
2314 | } else if (!same_magic(modmagic, vermagic, versindex)) { | |
2315 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", | |
2316 | mod->name, modmagic, vermagic); | |
2317 | return -ENOEXEC; | |
2318 | } | |
2319 | ||
2320 | if (get_modinfo(sechdrs, infoindex, "staging")) { | |
2321 | add_taint_module(mod, TAINT_CRAP); | |
2322 | printk(KERN_WARNING "%s: module is from the staging directory," | |
2323 | " the quality is unknown, you have been warned.\n", | |
2324 | mod->name); | |
2325 | } | |
22e268eb RR |
2326 | |
2327 | /* Set up license info based on the info section */ | |
2328 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
2329 | ||
40dd2560 RR |
2330 | return 0; |
2331 | } | |
2332 | ||
f91a13bb LT |
2333 | static void find_module_sections(struct module *mod, Elf_Ehdr *hdr, |
2334 | Elf_Shdr *sechdrs, const char *secstrings) | |
2335 | { | |
2336 | mod->kp = section_objs(hdr, sechdrs, secstrings, "__param", | |
2337 | sizeof(*mod->kp), &mod->num_kp); | |
2338 | mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab", | |
2339 | sizeof(*mod->syms), &mod->num_syms); | |
2340 | mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab"); | |
2341 | mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl", | |
2342 | sizeof(*mod->gpl_syms), | |
2343 | &mod->num_gpl_syms); | |
2344 | mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
2345 | mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings, | |
2346 | "__ksymtab_gpl_future", | |
2347 | sizeof(*mod->gpl_future_syms), | |
2348 | &mod->num_gpl_future_syms); | |
2349 | mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings, | |
2350 | "__kcrctab_gpl_future"); | |
2351 | ||
2352 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2353 | mod->unused_syms = section_objs(hdr, sechdrs, secstrings, | |
2354 | "__ksymtab_unused", | |
2355 | sizeof(*mod->unused_syms), | |
2356 | &mod->num_unused_syms); | |
2357 | mod->unused_crcs = section_addr(hdr, sechdrs, secstrings, | |
2358 | "__kcrctab_unused"); | |
2359 | mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings, | |
2360 | "__ksymtab_unused_gpl", | |
2361 | sizeof(*mod->unused_gpl_syms), | |
2362 | &mod->num_unused_gpl_syms); | |
2363 | mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings, | |
2364 | "__kcrctab_unused_gpl"); | |
2365 | #endif | |
2366 | #ifdef CONFIG_CONSTRUCTORS | |
2367 | mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors", | |
2368 | sizeof(*mod->ctors), &mod->num_ctors); | |
2369 | #endif | |
2370 | ||
2371 | #ifdef CONFIG_TRACEPOINTS | |
2372 | mod->tracepoints = section_objs(hdr, sechdrs, secstrings, | |
2373 | "__tracepoints", | |
2374 | sizeof(*mod->tracepoints), | |
2375 | &mod->num_tracepoints); | |
2376 | #endif | |
2377 | #ifdef CONFIG_EVENT_TRACING | |
2378 | mod->trace_events = section_objs(hdr, sechdrs, secstrings, | |
2379 | "_ftrace_events", | |
2380 | sizeof(*mod->trace_events), | |
2381 | &mod->num_trace_events); | |
2382 | /* | |
2383 | * This section contains pointers to allocated objects in the trace | |
2384 | * code and not scanning it leads to false positives. | |
2385 | */ | |
2386 | kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) * | |
2387 | mod->num_trace_events, GFP_KERNEL); | |
2388 | #endif | |
2389 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
2390 | /* sechdrs[0].sh_size is always zero */ | |
2391 | mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings, | |
2392 | "__mcount_loc", | |
2393 | sizeof(*mod->ftrace_callsites), | |
2394 | &mod->num_ftrace_callsites); | |
2395 | #endif | |
22e268eb RR |
2396 | |
2397 | if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) | |
2398 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", | |
2399 | mod->name); | |
f91a13bb LT |
2400 | } |
2401 | ||
d913188c RR |
2402 | static int move_module(struct module *mod, |
2403 | Elf_Ehdr *hdr, Elf_Shdr *sechdrs, | |
2404 | const char *secstrings, unsigned modindex) | |
65b8a9b4 LT |
2405 | { |
2406 | int i; | |
2407 | void *ptr; | |
2408 | ||
2409 | /* Do the allocs. */ | |
2410 | ptr = module_alloc_update_bounds(mod->core_size); | |
2411 | /* | |
2412 | * The pointer to this block is stored in the module structure | |
2413 | * which is inside the block. Just mark it as not being a | |
2414 | * leak. | |
2415 | */ | |
2416 | kmemleak_not_leak(ptr); | |
2417 | if (!ptr) | |
d913188c | 2418 | return -ENOMEM; |
65b8a9b4 LT |
2419 | |
2420 | memset(ptr, 0, mod->core_size); | |
2421 | mod->module_core = ptr; | |
2422 | ||
2423 | ptr = module_alloc_update_bounds(mod->init_size); | |
2424 | /* | |
2425 | * The pointer to this block is stored in the module structure | |
2426 | * which is inside the block. This block doesn't need to be | |
2427 | * scanned as it contains data and code that will be freed | |
2428 | * after the module is initialized. | |
2429 | */ | |
2430 | kmemleak_ignore(ptr); | |
2431 | if (!ptr && mod->init_size) { | |
2432 | module_free(mod, mod->module_core); | |
d913188c | 2433 | return -ENOMEM; |
65b8a9b4 LT |
2434 | } |
2435 | memset(ptr, 0, mod->init_size); | |
2436 | mod->module_init = ptr; | |
2437 | ||
2438 | /* Transfer each section which specifies SHF_ALLOC */ | |
2439 | DEBUGP("final section addresses:\n"); | |
2440 | for (i = 0; i < hdr->e_shnum; i++) { | |
2441 | void *dest; | |
2442 | ||
2443 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2444 | continue; | |
2445 | ||
2446 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
2447 | dest = mod->module_init | |
2448 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
2449 | else | |
2450 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
2451 | ||
2452 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
2453 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
2454 | sechdrs[i].sh_size); | |
2455 | /* Update sh_addr to point to copy in image. */ | |
2456 | sechdrs[i].sh_addr = (unsigned long)dest; | |
2457 | DEBUGP("\t0x%lx %s\n", | |
2458 | sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
2459 | } | |
d913188c RR |
2460 | |
2461 | return 0; | |
65b8a9b4 LT |
2462 | } |
2463 | ||
22e268eb RR |
2464 | static int check_module_license_and_versions(struct module *mod, |
2465 | Elf_Shdr *sechdrs) | |
2466 | { | |
2467 | /* | |
2468 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2469 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2470 | * using GPL-only symbols it needs. | |
2471 | */ | |
2472 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
2473 | add_taint(TAINT_PROPRIETARY_MODULE); | |
2474 | ||
2475 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2476 | if (strcmp(mod->name, "driverloader") == 0) | |
2477 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
2478 | ||
2479 | #ifdef CONFIG_MODVERSIONS | |
2480 | if ((mod->num_syms && !mod->crcs) | |
2481 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2482 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
2483 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2484 | || (mod->num_unused_syms && !mod->unused_crcs) | |
2485 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
2486 | #endif | |
2487 | ) { | |
2488 | return try_to_force_load(mod, | |
2489 | "no versions for exported symbols"); | |
2490 | } | |
2491 | #endif | |
2492 | return 0; | |
2493 | } | |
2494 | ||
2495 | static void flush_module_icache(const struct module *mod) | |
2496 | { | |
2497 | mm_segment_t old_fs; | |
2498 | ||
2499 | /* flush the icache in correct context */ | |
2500 | old_fs = get_fs(); | |
2501 | set_fs(KERNEL_DS); | |
2502 | ||
2503 | /* | |
2504 | * Flush the instruction cache, since we've played with text. | |
2505 | * Do it before processing of module parameters, so the module | |
2506 | * can provide parameter accessor functions of its own. | |
2507 | */ | |
2508 | if (mod->module_init) | |
2509 | flush_icache_range((unsigned long)mod->module_init, | |
2510 | (unsigned long)mod->module_init | |
2511 | + mod->init_size); | |
2512 | flush_icache_range((unsigned long)mod->module_core, | |
2513 | (unsigned long)mod->module_core + mod->core_size); | |
2514 | ||
2515 | set_fs(old_fs); | |
2516 | } | |
2517 | ||
d913188c | 2518 | static struct module *layout_and_allocate(struct load_info *info) |
1da177e4 | 2519 | { |
d913188c | 2520 | /* Module within temporary copy. */ |
1da177e4 | 2521 | struct module *mod; |
d913188c | 2522 | int err; |
3ae91c21 | 2523 | |
d913188c RR |
2524 | mod = setup_load_info(info); |
2525 | if (IS_ERR(mod)) | |
2526 | return mod; | |
1da177e4 | 2527 | |
d913188c | 2528 | err = check_modinfo(mod, info->sechdrs, info->index.info, info->index.vers); |
40dd2560 RR |
2529 | if (err) |
2530 | return ERR_PTR(err); | |
1da177e4 | 2531 | |
1da177e4 | 2532 | /* Allow arches to frob section contents and sizes. */ |
d913188c | 2533 | err = module_frob_arch_sections(info->hdr, info->sechdrs, info->secstrings, mod); |
1da177e4 | 2534 | if (err < 0) |
d913188c | 2535 | goto free_args; |
1da177e4 | 2536 | |
d913188c | 2537 | if (info->index.pcpu) { |
1da177e4 | 2538 | /* We have a special allocation for this section. */ |
d913188c RR |
2539 | err = percpu_modalloc(mod, info->sechdrs[info->index.pcpu].sh_size, |
2540 | info->sechdrs[info->index.pcpu].sh_addralign); | |
259354de | 2541 | if (err) |
d913188c RR |
2542 | goto free_args; |
2543 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 LT |
2544 | } |
2545 | ||
2546 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2547 | this is done generically; there doesn't appear to be any | |
2548 | special cases for the architectures. */ | |
d913188c RR |
2549 | layout_sections(mod, info->hdr, info->sechdrs, info->secstrings); |
2550 | ||
2551 | info->strmap = kzalloc(BITS_TO_LONGS(info->sechdrs[info->index.str].sh_size) | |
2552 | * sizeof(long), GFP_KERNEL); | |
2553 | if (!info->strmap) { | |
2554 | err = -ENOMEM; | |
2555 | goto free_percpu; | |
2556 | } | |
2557 | info->symoffs = layout_symtab(mod, info->sechdrs, info->index.sym, info->index.str, info->hdr, | |
2558 | info->secstrings, &info->stroffs, info->strmap); | |
1da177e4 | 2559 | |
65b8a9b4 | 2560 | /* Allocate and move to the final place */ |
d913188c RR |
2561 | err = move_module(mod, info->hdr, info->sechdrs, info->secstrings, info->index.mod); |
2562 | if (err) | |
2563 | goto free_strmap; | |
2564 | ||
2565 | /* Module has been copied to its final place now: return it. */ | |
2566 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2567 | kmemleak_load_module(mod, info->hdr, info->sechdrs, info->secstrings); | |
2568 | return mod; | |
2569 | ||
2570 | free_strmap: | |
2571 | kfree(info->strmap); | |
2572 | free_percpu: | |
2573 | percpu_modfree(mod); | |
2574 | free_args: | |
2575 | kfree(info->args); | |
2576 | return ERR_PTR(err); | |
2577 | } | |
2578 | ||
2579 | /* mod is no longer valid after this! */ | |
2580 | static void module_deallocate(struct module *mod, struct load_info *info) | |
2581 | { | |
2582 | kfree(info->strmap); | |
2583 | percpu_modfree(mod); | |
2584 | module_free(mod, mod->module_init); | |
2585 | module_free(mod, mod->module_core); | |
2586 | } | |
2587 | ||
2588 | /* Allocate and load the module: note that size of section 0 is always | |
2589 | zero, and we rely on this for optional sections. */ | |
2590 | static noinline struct module *load_module(void __user *umod, | |
2591 | unsigned long len, | |
2592 | const char __user *uargs) | |
2593 | { | |
2594 | struct load_info info = { NULL, }; | |
2595 | struct module *mod; | |
2596 | long err; | |
2597 | struct _ddebug *debug = NULL; | |
2598 | unsigned int num_debug = 0; | |
2599 | ||
2600 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
2601 | umod, len, uargs); | |
2602 | ||
2603 | /* Copy in the blobs from userspace, check they are vaguely sane. */ | |
2604 | err = copy_and_check(&info, umod, len, uargs); | |
2605 | if (err) | |
2606 | return ERR_PTR(err); | |
2607 | ||
2608 | /* Figure out module layout, and allocate all the memory. */ | |
2609 | mod = layout_and_allocate(&info); | |
65b8a9b4 LT |
2610 | if (IS_ERR(mod)) { |
2611 | err = PTR_ERR(mod); | |
d913188c | 2612 | goto free_copy; |
1da177e4 | 2613 | } |
1da177e4 LT |
2614 | |
2615 | /* Now we've moved module, initialize linked lists, etc. */ | |
9f85a4bb RR |
2616 | err = module_unload_init(mod); |
2617 | if (err) | |
d913188c | 2618 | goto free_module; |
1da177e4 | 2619 | |
22e268eb RR |
2620 | /* Now we've got everything in the final locations, we can |
2621 | * find optional sections. */ | |
3264d3f9 | 2622 | find_module_sections(mod, info.hdr, info.sechdrs, info.secstrings); |
9b37ccfc | 2623 | |
3264d3f9 | 2624 | err = check_module_license_and_versions(mod, info.sechdrs); |
22e268eb RR |
2625 | if (err) |
2626 | goto free_unload; | |
9841d61d | 2627 | |
c988d2b2 | 2628 | /* Set up MODINFO_ATTR fields */ |
3264d3f9 | 2629 | setup_modinfo(mod, info.sechdrs, info.index.info); |
c988d2b2 | 2630 | |
1da177e4 | 2631 | /* Fix up syms, so that st_value is a pointer to location. */ |
3264d3f9 | 2632 | err = simplify_symbols(info.sechdrs, info.index.sym, info.strtab, info.index.vers, info.index.pcpu, |
1da177e4 LT |
2633 | mod); |
2634 | if (err < 0) | |
d913188c | 2635 | goto free_modinfo; |
1da177e4 | 2636 | |
3264d3f9 | 2637 | err = apply_relocations(mod, info.hdr, info.sechdrs, info.index.sym, info.index.str); |
22e268eb | 2638 | if (err < 0) |
d913188c | 2639 | goto free_modinfo; |
1da177e4 LT |
2640 | |
2641 | /* Set up and sort exception table */ | |
3264d3f9 | 2642 | mod->extable = section_objs(info.hdr, info.sechdrs, info.secstrings, "__ex_table", |
5e458cc0 RR |
2643 | sizeof(*mod->extable), &mod->num_exentries); |
2644 | sort_extable(mod->extable, mod->extable + mod->num_exentries); | |
1da177e4 LT |
2645 | |
2646 | /* Finally, copy percpu area over. */ | |
3264d3f9 LT |
2647 | percpu_modcopy(mod, (void *)info.sechdrs[info.index.pcpu].sh_addr, |
2648 | info.sechdrs[info.index.pcpu].sh_size); | |
1da177e4 | 2649 | |
d913188c | 2650 | add_kallsyms(mod, &info); |
1da177e4 | 2651 | |
ff49d74a | 2652 | if (!mod->taints) |
3264d3f9 | 2653 | debug = section_objs(info.hdr, info.sechdrs, info.secstrings, "__verbose", |
5e458cc0 | 2654 | sizeof(*debug), &num_debug); |
90d595fe | 2655 | |
3264d3f9 | 2656 | err = module_finalize(info.hdr, info.sechdrs, mod); |
1da177e4 | 2657 | if (err < 0) |
d913188c | 2658 | goto free_modinfo; |
1da177e4 | 2659 | |
22e268eb | 2660 | flush_module_icache(mod); |
378bac82 | 2661 | |
3264d3f9 | 2662 | mod->args = info.args; |
8d3b33f6 | 2663 | |
d913188c RR |
2664 | mod->state = MODULE_STATE_COMING; |
2665 | ||
bb9d3d56 | 2666 | /* Now sew it into the lists so we can get lockdep and oops |
d72b3751 AK |
2667 | * info during argument parsing. Noone should access us, since |
2668 | * strong_try_module_get() will fail. | |
2669 | * lockdep/oops can run asynchronous, so use the RCU list insertion | |
2670 | * function to insert in a way safe to concurrent readers. | |
2671 | * The mutex protects against concurrent writers. | |
2672 | */ | |
75676500 | 2673 | mutex_lock(&module_mutex); |
3bafeb62 LT |
2674 | if (find_module(mod->name)) { |
2675 | err = -EEXIST; | |
be593f4c | 2676 | goto unlock; |
3bafeb62 LT |
2677 | } |
2678 | ||
ff49d74a YS |
2679 | if (debug) |
2680 | dynamic_debug_setup(debug, num_debug); | |
2681 | ||
be593f4c RR |
2682 | /* Find duplicate symbols */ |
2683 | err = verify_export_symbols(mod); | |
2684 | if (err < 0) | |
ff49d74a | 2685 | goto ddebug; |
be593f4c | 2686 | |
d72b3751 | 2687 | list_add_rcu(&mod->list, &modules); |
75676500 | 2688 | mutex_unlock(&module_mutex); |
bb9d3d56 | 2689 | |
e180a6b7 | 2690 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
1da177e4 | 2691 | if (err < 0) |
bb9d3d56 | 2692 | goto unlink; |
1da177e4 | 2693 | |
e180a6b7 | 2694 | err = mod_sysfs_setup(mod, mod->kp, mod->num_kp); |
1da177e4 | 2695 | if (err < 0) |
bb9d3d56 | 2696 | goto unlink; |
80a3d1bb | 2697 | |
3264d3f9 LT |
2698 | add_sect_attrs(mod, info.hdr->e_shnum, info.secstrings, info.sechdrs); |
2699 | add_notes_attrs(mod, info.hdr->e_shnum, info.secstrings, info.sechdrs); | |
1da177e4 | 2700 | |
d913188c RR |
2701 | /* Get rid of temporary copy and strmap. */ |
2702 | kfree(info.strmap); | |
2703 | free_copy(&info); | |
1da177e4 | 2704 | |
7ead8b83 LZ |
2705 | trace_module_load(mod); |
2706 | ||
1da177e4 LT |
2707 | /* Done! */ |
2708 | return mod; | |
2709 | ||
bb9d3d56 | 2710 | unlink: |
75676500 | 2711 | mutex_lock(&module_mutex); |
e91defa2 RR |
2712 | /* Unlink carefully: kallsyms could be walking list. */ |
2713 | list_del_rcu(&mod->list); | |
ff49d74a YS |
2714 | ddebug: |
2715 | dynamic_debug_remove(debug); | |
be593f4c | 2716 | unlock: |
75676500 | 2717 | mutex_unlock(&module_mutex); |
e91defa2 | 2718 | synchronize_sched(); |
1da177e4 | 2719 | module_arch_cleanup(mod); |
d913188c | 2720 | free_modinfo: |
a263f776 | 2721 | free_modinfo(mod); |
22e268eb | 2722 | free_unload: |
1da177e4 | 2723 | module_unload_free(mod); |
d913188c RR |
2724 | free_module: |
2725 | module_deallocate(mod, &info); | |
2726 | free_copy: | |
2727 | free_copy(&info); | |
6fe2e70b | 2728 | return ERR_PTR(err); |
1da177e4 LT |
2729 | } |
2730 | ||
b99b87f7 PO |
2731 | /* Call module constructors. */ |
2732 | static void do_mod_ctors(struct module *mod) | |
2733 | { | |
2734 | #ifdef CONFIG_CONSTRUCTORS | |
2735 | unsigned long i; | |
2736 | ||
2737 | for (i = 0; i < mod->num_ctors; i++) | |
2738 | mod->ctors[i](); | |
2739 | #endif | |
2740 | } | |
2741 | ||
1da177e4 | 2742 | /* This is where the real work happens */ |
17da2bd9 HC |
2743 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2744 | unsigned long, len, const char __user *, uargs) | |
1da177e4 LT |
2745 | { |
2746 | struct module *mod; | |
2747 | int ret = 0; | |
2748 | ||
2749 | /* Must have permission */ | |
3d43321b | 2750 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
1da177e4 LT |
2751 | return -EPERM; |
2752 | ||
1da177e4 LT |
2753 | /* Do all the hard work */ |
2754 | mod = load_module(umod, len, uargs); | |
75676500 | 2755 | if (IS_ERR(mod)) |
1da177e4 | 2756 | return PTR_ERR(mod); |
1da177e4 | 2757 | |
e041c683 AS |
2758 | blocking_notifier_call_chain(&module_notify_list, |
2759 | MODULE_STATE_COMING, mod); | |
1da177e4 | 2760 | |
b99b87f7 | 2761 | do_mod_ctors(mod); |
1da177e4 LT |
2762 | /* Start the module */ |
2763 | if (mod->init != NULL) | |
59f9415f | 2764 | ret = do_one_initcall(mod->init); |
1da177e4 LT |
2765 | if (ret < 0) { |
2766 | /* Init routine failed: abort. Try to protect us from | |
2767 | buggy refcounters. */ | |
2768 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2769 | synchronize_sched(); |
af49d924 | 2770 | module_put(mod); |
df4b565e PO |
2771 | blocking_notifier_call_chain(&module_notify_list, |
2772 | MODULE_STATE_GOING, mod); | |
af49d924 | 2773 | free_module(mod); |
c9a3ba55 | 2774 | wake_up(&module_wq); |
1da177e4 LT |
2775 | return ret; |
2776 | } | |
e24e2e64 | 2777 | if (ret > 0) { |
ad361c98 JP |
2778 | printk(KERN_WARNING |
2779 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" | |
2780 | "%s: loading module anyway...\n", | |
e24e2e64 AD |
2781 | __func__, mod->name, ret, |
2782 | __func__); | |
2783 | dump_stack(); | |
2784 | } | |
1da177e4 | 2785 | |
6c5db22d | 2786 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 2787 | mod->state = MODULE_STATE_LIVE; |
6c5db22d | 2788 | wake_up(&module_wq); |
0deddf43 MH |
2789 | blocking_notifier_call_chain(&module_notify_list, |
2790 | MODULE_STATE_LIVE, mod); | |
6c5db22d | 2791 | |
d6de2c80 LT |
2792 | /* We need to finish all async code before the module init sequence is done */ |
2793 | async_synchronize_full(); | |
2794 | ||
6c5db22d | 2795 | mutex_lock(&module_mutex); |
1da177e4 LT |
2796 | /* Drop initial reference. */ |
2797 | module_put(mod); | |
ad6561df | 2798 | trim_init_extable(mod); |
4a496226 JB |
2799 | #ifdef CONFIG_KALLSYMS |
2800 | mod->num_symtab = mod->core_num_syms; | |
2801 | mod->symtab = mod->core_symtab; | |
554bdfe5 | 2802 | mod->strtab = mod->core_strtab; |
4a496226 | 2803 | #endif |
1da177e4 LT |
2804 | module_free(mod, mod->module_init); |
2805 | mod->module_init = NULL; | |
2806 | mod->init_size = 0; | |
2807 | mod->init_text_size = 0; | |
6389a385 | 2808 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2809 | |
2810 | return 0; | |
2811 | } | |
2812 | ||
2813 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2814 | { | |
2815 | return ((void *)addr >= start && (void *)addr < start + size); | |
2816 | } | |
2817 | ||
2818 | #ifdef CONFIG_KALLSYMS | |
2819 | /* | |
2820 | * This ignores the intensely annoying "mapping symbols" found | |
2821 | * in ARM ELF files: $a, $t and $d. | |
2822 | */ | |
2823 | static inline int is_arm_mapping_symbol(const char *str) | |
2824 | { | |
22a8bdeb | 2825 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2826 | && (str[2] == '\0' || str[2] == '.'); |
2827 | } | |
2828 | ||
2829 | static const char *get_ksymbol(struct module *mod, | |
2830 | unsigned long addr, | |
2831 | unsigned long *size, | |
2832 | unsigned long *offset) | |
2833 | { | |
2834 | unsigned int i, best = 0; | |
2835 | unsigned long nextval; | |
2836 | ||
2837 | /* At worse, next value is at end of module */ | |
a06f6211 | 2838 | if (within_module_init(addr, mod)) |
1da177e4 | 2839 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 2840 | else |
1da177e4 LT |
2841 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2842 | ||
2843 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
22a8bdeb | 2844 | starts real symbols at 1). */ |
1da177e4 LT |
2845 | for (i = 1; i < mod->num_symtab; i++) { |
2846 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2847 | continue; | |
2848 | ||
2849 | /* We ignore unnamed symbols: they're uninformative | |
2850 | * and inserted at a whim. */ | |
2851 | if (mod->symtab[i].st_value <= addr | |
2852 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2853 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2854 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2855 | best = i; | |
2856 | if (mod->symtab[i].st_value > addr | |
2857 | && mod->symtab[i].st_value < nextval | |
2858 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2859 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2860 | nextval = mod->symtab[i].st_value; | |
2861 | } | |
2862 | ||
2863 | if (!best) | |
2864 | return NULL; | |
2865 | ||
ffb45122 AD |
2866 | if (size) |
2867 | *size = nextval - mod->symtab[best].st_value; | |
2868 | if (offset) | |
2869 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2870 | return mod->strtab + mod->symtab[best].st_name; |
2871 | } | |
2872 | ||
6dd06c9f RR |
2873 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2874 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 2875 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
2876 | unsigned long *size, |
2877 | unsigned long *offset, | |
2878 | char **modname, | |
2879 | char *namebuf) | |
1da177e4 LT |
2880 | { |
2881 | struct module *mod; | |
cb2a5205 | 2882 | const char *ret = NULL; |
1da177e4 | 2883 | |
cb2a5205 | 2884 | preempt_disable(); |
d72b3751 | 2885 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2886 | if (within_module_init(addr, mod) || |
2887 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
2888 | if (modname) |
2889 | *modname = mod->name; | |
cb2a5205 RR |
2890 | ret = get_ksymbol(mod, addr, size, offset); |
2891 | break; | |
1da177e4 LT |
2892 | } |
2893 | } | |
6dd06c9f RR |
2894 | /* Make a copy in here where it's safe */ |
2895 | if (ret) { | |
2896 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
2897 | ret = namebuf; | |
2898 | } | |
cb2a5205 | 2899 | preempt_enable(); |
92dfc9dc | 2900 | return ret; |
1da177e4 LT |
2901 | } |
2902 | ||
9d65cb4a AD |
2903 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2904 | { | |
2905 | struct module *mod; | |
2906 | ||
cb2a5205 | 2907 | preempt_disable(); |
d72b3751 | 2908 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2909 | if (within_module_init(addr, mod) || |
2910 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
2911 | const char *sym; |
2912 | ||
2913 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2914 | if (!sym) | |
2915 | goto out; | |
9281acea | 2916 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 2917 | preempt_enable(); |
9d65cb4a AD |
2918 | return 0; |
2919 | } | |
2920 | } | |
2921 | out: | |
cb2a5205 | 2922 | preempt_enable(); |
9d65cb4a AD |
2923 | return -ERANGE; |
2924 | } | |
2925 | ||
a5c43dae AD |
2926 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2927 | unsigned long *offset, char *modname, char *name) | |
2928 | { | |
2929 | struct module *mod; | |
2930 | ||
cb2a5205 | 2931 | preempt_disable(); |
d72b3751 | 2932 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
2933 | if (within_module_init(addr, mod) || |
2934 | within_module_core(addr, mod)) { | |
a5c43dae AD |
2935 | const char *sym; |
2936 | ||
2937 | sym = get_ksymbol(mod, addr, size, offset); | |
2938 | if (!sym) | |
2939 | goto out; | |
2940 | if (modname) | |
9281acea | 2941 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 2942 | if (name) |
9281acea | 2943 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 2944 | preempt_enable(); |
a5c43dae AD |
2945 | return 0; |
2946 | } | |
2947 | } | |
2948 | out: | |
cb2a5205 | 2949 | preempt_enable(); |
a5c43dae AD |
2950 | return -ERANGE; |
2951 | } | |
2952 | ||
ea07890a AD |
2953 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2954 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2955 | { |
2956 | struct module *mod; | |
2957 | ||
cb2a5205 | 2958 | preempt_disable(); |
d72b3751 | 2959 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
2960 | if (symnum < mod->num_symtab) { |
2961 | *value = mod->symtab[symnum].st_value; | |
2962 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2963 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
2964 | KSYM_NAME_LEN); |
2965 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 2966 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 2967 | preempt_enable(); |
ea07890a | 2968 | return 0; |
1da177e4 LT |
2969 | } |
2970 | symnum -= mod->num_symtab; | |
2971 | } | |
cb2a5205 | 2972 | preempt_enable(); |
ea07890a | 2973 | return -ERANGE; |
1da177e4 LT |
2974 | } |
2975 | ||
2976 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2977 | { | |
2978 | unsigned int i; | |
2979 | ||
2980 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2981 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2982 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2983 | return mod->symtab[i].st_value; |
2984 | return 0; | |
2985 | } | |
2986 | ||
2987 | /* Look for this name: can be of form module:name. */ | |
2988 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2989 | { | |
2990 | struct module *mod; | |
2991 | char *colon; | |
2992 | unsigned long ret = 0; | |
2993 | ||
2994 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 2995 | preempt_disable(); |
1da177e4 LT |
2996 | if ((colon = strchr(name, ':')) != NULL) { |
2997 | *colon = '\0'; | |
2998 | if ((mod = find_module(name)) != NULL) | |
2999 | ret = mod_find_symname(mod, colon+1); | |
3000 | *colon = ':'; | |
3001 | } else { | |
d72b3751 | 3002 | list_for_each_entry_rcu(mod, &modules, list) |
1da177e4 LT |
3003 | if ((ret = mod_find_symname(mod, name)) != 0) |
3004 | break; | |
3005 | } | |
cb2a5205 | 3006 | preempt_enable(); |
1da177e4 LT |
3007 | return ret; |
3008 | } | |
75a66614 AK |
3009 | |
3010 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3011 | struct module *, unsigned long), | |
3012 | void *data) | |
3013 | { | |
3014 | struct module *mod; | |
3015 | unsigned int i; | |
3016 | int ret; | |
3017 | ||
3018 | list_for_each_entry(mod, &modules, list) { | |
3019 | for (i = 0; i < mod->num_symtab; i++) { | |
3020 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3021 | mod, mod->symtab[i].st_value); | |
3022 | if (ret != 0) | |
3023 | return ret; | |
3024 | } | |
3025 | } | |
3026 | return 0; | |
3027 | } | |
1da177e4 LT |
3028 | #endif /* CONFIG_KALLSYMS */ |
3029 | ||
21aa9280 | 3030 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3031 | { |
3032 | int bx = 0; | |
3033 | ||
21aa9280 AV |
3034 | if (mod->taints || |
3035 | mod->state == MODULE_STATE_GOING || | |
3036 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3037 | buf[bx++] = '('; |
25ddbb18 | 3038 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e8 | 3039 | buf[bx++] = 'P'; |
25ddbb18 | 3040 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e8 | 3041 | buf[bx++] = 'F'; |
26e9a397 | 3042 | if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd3 | 3043 | buf[bx++] = 'C'; |
fa3ba2e8 FM |
3044 | /* |
3045 | * TAINT_FORCED_RMMOD: could be added. | |
3046 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
3047 | * apply to modules. | |
3048 | */ | |
21aa9280 AV |
3049 | |
3050 | /* Show a - for module-is-being-unloaded */ | |
3051 | if (mod->state == MODULE_STATE_GOING) | |
3052 | buf[bx++] = '-'; | |
3053 | /* Show a + for module-is-being-loaded */ | |
3054 | if (mod->state == MODULE_STATE_COMING) | |
3055 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3056 | buf[bx++] = ')'; |
3057 | } | |
3058 | buf[bx] = '\0'; | |
3059 | ||
3060 | return buf; | |
3061 | } | |
3062 | ||
3b5d5c6b AD |
3063 | #ifdef CONFIG_PROC_FS |
3064 | /* Called by the /proc file system to return a list of modules. */ | |
3065 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3066 | { | |
3067 | mutex_lock(&module_mutex); | |
3068 | return seq_list_start(&modules, *pos); | |
3069 | } | |
3070 | ||
3071 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3072 | { | |
3073 | return seq_list_next(p, &modules, pos); | |
3074 | } | |
3075 | ||
3076 | static void m_stop(struct seq_file *m, void *p) | |
3077 | { | |
3078 | mutex_unlock(&module_mutex); | |
3079 | } | |
3080 | ||
1da177e4 LT |
3081 | static int m_show(struct seq_file *m, void *p) |
3082 | { | |
3083 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3084 | char buf[8]; |
3085 | ||
2f0f2a33 | 3086 | seq_printf(m, "%s %u", |
1da177e4 LT |
3087 | mod->name, mod->init_size + mod->core_size); |
3088 | print_unload_info(m, mod); | |
3089 | ||
3090 | /* Informative for users. */ | |
3091 | seq_printf(m, " %s", | |
3092 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
3093 | mod->state == MODULE_STATE_COMING ? "Loading": | |
3094 | "Live"); | |
3095 | /* Used by oprofile and other similar tools. */ | |
3096 | seq_printf(m, " 0x%p", mod->module_core); | |
3097 | ||
fa3ba2e8 FM |
3098 | /* Taints info */ |
3099 | if (mod->taints) | |
21aa9280 | 3100 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3101 | |
1da177e4 LT |
3102 | seq_printf(m, "\n"); |
3103 | return 0; | |
3104 | } | |
3105 | ||
3106 | /* Format: modulename size refcount deps address | |
3107 | ||
3108 | Where refcount is a number or -, and deps is a comma-separated list | |
3109 | of depends or -. | |
3110 | */ | |
3b5d5c6b | 3111 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3112 | .start = m_start, |
3113 | .next = m_next, | |
3114 | .stop = m_stop, | |
3115 | .show = m_show | |
3116 | }; | |
3117 | ||
3b5d5c6b AD |
3118 | static int modules_open(struct inode *inode, struct file *file) |
3119 | { | |
3120 | return seq_open(file, &modules_op); | |
3121 | } | |
3122 | ||
3123 | static const struct file_operations proc_modules_operations = { | |
3124 | .open = modules_open, | |
3125 | .read = seq_read, | |
3126 | .llseek = seq_lseek, | |
3127 | .release = seq_release, | |
3128 | }; | |
3129 | ||
3130 | static int __init proc_modules_init(void) | |
3131 | { | |
3132 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3133 | return 0; | |
3134 | } | |
3135 | module_init(proc_modules_init); | |
3136 | #endif | |
3137 | ||
1da177e4 LT |
3138 | /* Given an address, look for it in the module exception tables. */ |
3139 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3140 | { | |
1da177e4 LT |
3141 | const struct exception_table_entry *e = NULL; |
3142 | struct module *mod; | |
3143 | ||
24da1cbf | 3144 | preempt_disable(); |
d72b3751 | 3145 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
3146 | if (mod->num_exentries == 0) |
3147 | continue; | |
22a8bdeb | 3148 | |
1da177e4 LT |
3149 | e = search_extable(mod->extable, |
3150 | mod->extable + mod->num_exentries - 1, | |
3151 | addr); | |
3152 | if (e) | |
3153 | break; | |
3154 | } | |
24da1cbf | 3155 | preempt_enable(); |
1da177e4 LT |
3156 | |
3157 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3158 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3159 | return e; |
3160 | } | |
3161 | ||
4d435f9d | 3162 | /* |
e610499e RR |
3163 | * is_module_address - is this address inside a module? |
3164 | * @addr: the address to check. | |
3165 | * | |
3166 | * See is_module_text_address() if you simply want to see if the address | |
3167 | * is code (not data). | |
4d435f9d | 3168 | */ |
e610499e | 3169 | bool is_module_address(unsigned long addr) |
4d435f9d | 3170 | { |
e610499e | 3171 | bool ret; |
4d435f9d | 3172 | |
24da1cbf | 3173 | preempt_disable(); |
e610499e | 3174 | ret = __module_address(addr) != NULL; |
24da1cbf | 3175 | preempt_enable(); |
4d435f9d | 3176 | |
e610499e | 3177 | return ret; |
4d435f9d IM |
3178 | } |
3179 | ||
e610499e RR |
3180 | /* |
3181 | * __module_address - get the module which contains an address. | |
3182 | * @addr: the address. | |
3183 | * | |
3184 | * Must be called with preempt disabled or module mutex held so that | |
3185 | * module doesn't get freed during this. | |
3186 | */ | |
714f83d5 | 3187 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3188 | { |
3189 | struct module *mod; | |
3190 | ||
3a642e99 RR |
3191 | if (addr < module_addr_min || addr > module_addr_max) |
3192 | return NULL; | |
3193 | ||
d72b3751 | 3194 | list_for_each_entry_rcu(mod, &modules, list) |
e610499e RR |
3195 | if (within_module_core(addr, mod) |
3196 | || within_module_init(addr, mod)) | |
1da177e4 LT |
3197 | return mod; |
3198 | return NULL; | |
3199 | } | |
c6b37801 | 3200 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3201 | |
e610499e RR |
3202 | /* |
3203 | * is_module_text_address - is this address inside module code? | |
3204 | * @addr: the address to check. | |
3205 | * | |
3206 | * See is_module_address() if you simply want to see if the address is | |
3207 | * anywhere in a module. See kernel_text_address() for testing if an | |
3208 | * address corresponds to kernel or module code. | |
3209 | */ | |
3210 | bool is_module_text_address(unsigned long addr) | |
3211 | { | |
3212 | bool ret; | |
3213 | ||
3214 | preempt_disable(); | |
3215 | ret = __module_text_address(addr) != NULL; | |
3216 | preempt_enable(); | |
3217 | ||
3218 | return ret; | |
3219 | } | |
3220 | ||
3221 | /* | |
3222 | * __module_text_address - get the module whose code contains an address. | |
3223 | * @addr: the address. | |
3224 | * | |
3225 | * Must be called with preempt disabled or module mutex held so that | |
3226 | * module doesn't get freed during this. | |
3227 | */ | |
3228 | struct module *__module_text_address(unsigned long addr) | |
3229 | { | |
3230 | struct module *mod = __module_address(addr); | |
3231 | if (mod) { | |
3232 | /* Make sure it's within the text section. */ | |
3233 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3234 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3235 | mod = NULL; | |
3236 | } | |
3237 | return mod; | |
3238 | } | |
c6b37801 | 3239 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3240 | |
1da177e4 LT |
3241 | /* Don't grab lock, we're oopsing. */ |
3242 | void print_modules(void) | |
3243 | { | |
3244 | struct module *mod; | |
2bc2d61a | 3245 | char buf[8]; |
1da177e4 | 3246 | |
b231125a | 3247 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3248 | /* Most callers should already have preempt disabled, but make sure */ |
3249 | preempt_disable(); | |
3250 | list_for_each_entry_rcu(mod, &modules, list) | |
21aa9280 | 3251 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b3751 | 3252 | preempt_enable(); |
e14af7ee AV |
3253 | if (last_unloaded_module[0]) |
3254 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3255 | printk("\n"); |
3256 | } | |
3257 | ||
1da177e4 | 3258 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3259 | /* Generate the signature for all relevant module structures here. |
3260 | * If these change, we don't want to try to parse the module. */ | |
3261 | void module_layout(struct module *mod, | |
3262 | struct modversion_info *ver, | |
3263 | struct kernel_param *kp, | |
3264 | struct kernel_symbol *ks, | |
8c8ef42a RR |
3265 | struct tracepoint *tp) |
3266 | { | |
3267 | } | |
3268 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3269 | #endif |
8256e47c | 3270 | |
97e1c18e MD |
3271 | #ifdef CONFIG_TRACEPOINTS |
3272 | void module_update_tracepoints(void) | |
3273 | { | |
3274 | struct module *mod; | |
3275 | ||
3276 | mutex_lock(&module_mutex); | |
3277 | list_for_each_entry(mod, &modules, list) | |
3278 | if (!mod->taints) | |
3279 | tracepoint_update_probe_range(mod->tracepoints, | |
3280 | mod->tracepoints + mod->num_tracepoints); | |
3281 | mutex_unlock(&module_mutex); | |
3282 | } | |
3283 | ||
3284 | /* | |
3285 | * Returns 0 if current not found. | |
3286 | * Returns 1 if current found. | |
3287 | */ | |
3288 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) | |
3289 | { | |
3290 | struct module *iter_mod; | |
3291 | int found = 0; | |
3292 | ||
3293 | mutex_lock(&module_mutex); | |
3294 | list_for_each_entry(iter_mod, &modules, list) { | |
3295 | if (!iter_mod->taints) { | |
3296 | /* | |
3297 | * Sorted module list | |
3298 | */ | |
3299 | if (iter_mod < iter->module) | |
3300 | continue; | |
3301 | else if (iter_mod > iter->module) | |
3302 | iter->tracepoint = NULL; | |
3303 | found = tracepoint_get_iter_range(&iter->tracepoint, | |
3304 | iter_mod->tracepoints, | |
3305 | iter_mod->tracepoints | |
3306 | + iter_mod->num_tracepoints); | |
3307 | if (found) { | |
3308 | iter->module = iter_mod; | |
3309 | break; | |
3310 | } | |
3311 | } | |
3312 | } | |
3313 | mutex_unlock(&module_mutex); | |
3314 | return found; | |
3315 | } | |
3316 | #endif |