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Commit | Line | Data |
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f71d20e9 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 LT |
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 | */ | |
9984de1a | 19 | #include <linux/export.h> |
1da177e4 | 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> |
bf5438fc | 58 | #include <linux/jump_label.h> |
84e1c6bb | 59 | #include <linux/pfn.h> |
403ed278 | 60 | #include <linux/bsearch.h> |
1da177e4 | 61 | |
7ead8b83 LZ |
62 | #define CREATE_TRACE_POINTS |
63 | #include <trace/events/module.h> | |
64 | ||
1da177e4 LT |
65 | #ifndef ARCH_SHF_SMALL |
66 | #define ARCH_SHF_SMALL 0 | |
67 | #endif | |
68 | ||
84e1c6bb MC |
69 | /* |
70 | * Modules' sections will be aligned on page boundaries | |
71 | * to ensure complete separation of code and data, but | |
72 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y | |
73 | */ | |
74 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
75 | # define debug_align(X) ALIGN(X, PAGE_SIZE) | |
76 | #else | |
77 | # define debug_align(X) (X) | |
78 | #endif | |
79 | ||
80 | /* | |
81 | * Given BASE and SIZE this macro calculates the number of pages the | |
82 | * memory regions occupies | |
83 | */ | |
84 | #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \ | |
85 | (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \ | |
86 | PFN_DOWN((unsigned long)BASE) + 1) \ | |
87 | : (0UL)) | |
88 | ||
1da177e4 LT |
89 | /* If this is set, the section belongs in the init part of the module */ |
90 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
91 | ||
75676500 RR |
92 | /* |
93 | * Mutex protects: | |
94 | * 1) List of modules (also safely readable with preempt_disable), | |
95 | * 2) module_use links, | |
96 | * 3) module_addr_min/module_addr_max. | |
d72b3751 | 97 | * (delete uses stop_machine/add uses RCU list operations). */ |
c6b37801 TA |
98 | DEFINE_MUTEX(module_mutex); |
99 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 100 | static LIST_HEAD(modules); |
67fc4e0c JW |
101 | #ifdef CONFIG_KGDB_KDB |
102 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
103 | #endif /* CONFIG_KGDB_KDB */ | |
104 | ||
1da177e4 | 105 | |
19e4529e SR |
106 | /* Block module loading/unloading? */ |
107 | int modules_disabled = 0; | |
02608bef | 108 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 109 | |
c9a3ba55 RR |
110 | /* Waiting for a module to finish initializing? */ |
111 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
112 | ||
e041c683 | 113 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 114 | |
75676500 RR |
115 | /* Bounds of module allocation, for speeding __module_address. |
116 | * Protected by module_mutex. */ | |
3a642e99 RR |
117 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
118 | ||
1da177e4 LT |
119 | int register_module_notifier(struct notifier_block * nb) |
120 | { | |
e041c683 | 121 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
122 | } |
123 | EXPORT_SYMBOL(register_module_notifier); | |
124 | ||
125 | int unregister_module_notifier(struct notifier_block * nb) | |
126 | { | |
e041c683 | 127 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
128 | } |
129 | EXPORT_SYMBOL(unregister_module_notifier); | |
130 | ||
eded41c1 RR |
131 | struct load_info { |
132 | Elf_Ehdr *hdr; | |
133 | unsigned long len; | |
134 | Elf_Shdr *sechdrs; | |
6526c534 | 135 | char *secstrings, *strtab; |
d913188c | 136 | unsigned long symoffs, stroffs; |
811d66a0 RR |
137 | struct _ddebug *debug; |
138 | unsigned int num_debug; | |
eded41c1 RR |
139 | struct { |
140 | unsigned int sym, str, mod, vers, info, pcpu; | |
141 | } index; | |
142 | }; | |
143 | ||
9a4b9708 ML |
144 | /* We require a truly strong try_module_get(): 0 means failure due to |
145 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
146 | static inline int strong_try_module_get(struct module *mod) |
147 | { | |
148 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
149 | return -EBUSY; |
150 | if (try_module_get(mod)) | |
1da177e4 | 151 | return 0; |
c9a3ba55 RR |
152 | else |
153 | return -ENOENT; | |
1da177e4 LT |
154 | } |
155 | ||
fa3ba2e8 FM |
156 | static inline void add_taint_module(struct module *mod, unsigned flag) |
157 | { | |
158 | add_taint(flag); | |
25ddbb18 | 159 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
160 | } |
161 | ||
02a3e59a RD |
162 | /* |
163 | * A thread that wants to hold a reference to a module only while it | |
164 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
165 | */ |
166 | void __module_put_and_exit(struct module *mod, long code) | |
167 | { | |
168 | module_put(mod); | |
169 | do_exit(code); | |
170 | } | |
171 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 172 | |
1da177e4 | 173 | /* Find a module section: 0 means not found. */ |
49668688 | 174 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
175 | { |
176 | unsigned int i; | |
177 | ||
49668688 RR |
178 | for (i = 1; i < info->hdr->e_shnum; i++) { |
179 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 180 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
181 | if ((shdr->sh_flags & SHF_ALLOC) |
182 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 183 | return i; |
49668688 | 184 | } |
1da177e4 LT |
185 | return 0; |
186 | } | |
187 | ||
5e458cc0 | 188 | /* Find a module section, or NULL. */ |
49668688 | 189 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
190 | { |
191 | /* Section 0 has sh_addr 0. */ | |
49668688 | 192 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
193 | } |
194 | ||
195 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 196 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
197 | const char *name, |
198 | size_t object_size, | |
199 | unsigned int *num) | |
200 | { | |
49668688 | 201 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
202 | |
203 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
204 | *num = info->sechdrs[sec].sh_size / object_size; |
205 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
206 | } |
207 | ||
1da177e4 LT |
208 | /* Provided by the linker */ |
209 | extern const struct kernel_symbol __start___ksymtab[]; | |
210 | extern const struct kernel_symbol __stop___ksymtab[]; | |
211 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
212 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
213 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
214 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
215 | extern const unsigned long __start___kcrctab[]; |
216 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 217 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
218 | #ifdef CONFIG_UNUSED_SYMBOLS |
219 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
220 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
221 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
222 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
223 | extern const unsigned long __start___kcrctab_unused[]; |
224 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 225 | #endif |
1da177e4 LT |
226 | |
227 | #ifndef CONFIG_MODVERSIONS | |
228 | #define symversion(base, idx) NULL | |
229 | #else | |
f83ca9fe | 230 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
231 | #endif |
232 | ||
dafd0940 RR |
233 | static bool each_symbol_in_section(const struct symsearch *arr, |
234 | unsigned int arrsize, | |
235 | struct module *owner, | |
236 | bool (*fn)(const struct symsearch *syms, | |
237 | struct module *owner, | |
de4d8d53 | 238 | void *data), |
dafd0940 | 239 | void *data) |
ad9546c9 | 240 | { |
de4d8d53 | 241 | unsigned int j; |
ad9546c9 | 242 | |
dafd0940 | 243 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
244 | if (fn(&arr[j], owner, data)) |
245 | return true; | |
f71d20e9 | 246 | } |
dafd0940 RR |
247 | |
248 | return false; | |
ad9546c9 RR |
249 | } |
250 | ||
dafd0940 | 251 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
252 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
253 | struct module *owner, | |
254 | void *data), | |
255 | void *data) | |
ad9546c9 RR |
256 | { |
257 | struct module *mod; | |
44032e63 | 258 | static const struct symsearch arr[] = { |
ad9546c9 | 259 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 260 | NOT_GPL_ONLY, false }, |
ad9546c9 | 261 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
262 | __start___kcrctab_gpl, |
263 | GPL_ONLY, false }, | |
ad9546c9 | 264 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
265 | __start___kcrctab_gpl_future, |
266 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 267 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 268 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
269 | __start___kcrctab_unused, |
270 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 271 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
272 | __start___kcrctab_unused_gpl, |
273 | GPL_ONLY, true }, | |
f7f5b675 | 274 | #endif |
ad9546c9 | 275 | }; |
f71d20e9 | 276 | |
dafd0940 RR |
277 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
278 | return true; | |
f71d20e9 | 279 | |
d72b3751 | 280 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
281 | struct symsearch arr[] = { |
282 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 283 | NOT_GPL_ONLY, false }, |
ad9546c9 | 284 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
285 | mod->gpl_crcs, |
286 | GPL_ONLY, false }, | |
ad9546c9 RR |
287 | { mod->gpl_future_syms, |
288 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
289 | mod->gpl_future_crcs, |
290 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 291 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
292 | { mod->unused_syms, |
293 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
294 | mod->unused_crcs, |
295 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
296 | { mod->unused_gpl_syms, |
297 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
298 | mod->unused_gpl_crcs, |
299 | GPL_ONLY, true }, | |
f7f5b675 | 300 | #endif |
ad9546c9 RR |
301 | }; |
302 | ||
dafd0940 RR |
303 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
304 | return true; | |
305 | } | |
306 | return false; | |
307 | } | |
de4d8d53 | 308 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
309 | |
310 | struct find_symbol_arg { | |
311 | /* Input */ | |
312 | const char *name; | |
313 | bool gplok; | |
314 | bool warn; | |
315 | ||
316 | /* Output */ | |
317 | struct module *owner; | |
318 | const unsigned long *crc; | |
414fd31b | 319 | const struct kernel_symbol *sym; |
dafd0940 RR |
320 | }; |
321 | ||
de4d8d53 RR |
322 | static bool check_symbol(const struct symsearch *syms, |
323 | struct module *owner, | |
324 | unsigned int symnum, void *data) | |
dafd0940 RR |
325 | { |
326 | struct find_symbol_arg *fsa = data; | |
327 | ||
dafd0940 RR |
328 | if (!fsa->gplok) { |
329 | if (syms->licence == GPL_ONLY) | |
330 | return false; | |
331 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
332 | printk(KERN_WARNING "Symbol %s is being used " | |
333 | "by a non-GPL module, which will not " | |
334 | "be allowed in the future\n", fsa->name); | |
335 | printk(KERN_WARNING "Please see the file " | |
336 | "Documentation/feature-removal-schedule.txt " | |
337 | "in the kernel source tree for more details.\n"); | |
9f28bb7e | 338 | } |
1da177e4 | 339 | } |
ad9546c9 | 340 | |
f7f5b675 | 341 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
342 | if (syms->unused && fsa->warn) { |
343 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
344 | "however this module is using it.\n", fsa->name); | |
345 | printk(KERN_WARNING | |
346 | "This symbol will go away in the future.\n"); | |
347 | printk(KERN_WARNING | |
348 | "Please evalute if this is the right api to use and if " | |
349 | "it really is, submit a report the linux kernel " | |
350 | "mailinglist together with submitting your code for " | |
351 | "inclusion.\n"); | |
352 | } | |
f7f5b675 | 353 | #endif |
dafd0940 RR |
354 | |
355 | fsa->owner = owner; | |
356 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 357 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
358 | return true; |
359 | } | |
360 | ||
403ed278 AIB |
361 | static int cmp_name(const void *va, const void *vb) |
362 | { | |
363 | const char *a; | |
364 | const struct kernel_symbol *b; | |
365 | a = va; b = vb; | |
366 | return strcmp(a, b->name); | |
367 | } | |
368 | ||
de4d8d53 RR |
369 | static bool find_symbol_in_section(const struct symsearch *syms, |
370 | struct module *owner, | |
371 | void *data) | |
372 | { | |
373 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
374 | struct kernel_symbol *sym; |
375 | ||
376 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
377 | sizeof(struct kernel_symbol), cmp_name); | |
378 | ||
379 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
380 | return true; | |
de4d8d53 | 381 | |
de4d8d53 RR |
382 | return false; |
383 | } | |
384 | ||
414fd31b | 385 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 386 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
387 | const struct kernel_symbol *find_symbol(const char *name, |
388 | struct module **owner, | |
389 | const unsigned long **crc, | |
390 | bool gplok, | |
391 | bool warn) | |
dafd0940 RR |
392 | { |
393 | struct find_symbol_arg fsa; | |
394 | ||
395 | fsa.name = name; | |
396 | fsa.gplok = gplok; | |
397 | fsa.warn = warn; | |
398 | ||
de4d8d53 | 399 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
400 | if (owner) |
401 | *owner = fsa.owner; | |
402 | if (crc) | |
403 | *crc = fsa.crc; | |
414fd31b | 404 | return fsa.sym; |
dafd0940 RR |
405 | } |
406 | ||
5e124169 | 407 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 408 | return NULL; |
1da177e4 | 409 | } |
c6b37801 | 410 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 411 | |
1da177e4 | 412 | /* Search for module by name: must hold module_mutex. */ |
c6b37801 | 413 | struct module *find_module(const char *name) |
1da177e4 LT |
414 | { |
415 | struct module *mod; | |
416 | ||
417 | list_for_each_entry(mod, &modules, list) { | |
418 | if (strcmp(mod->name, name) == 0) | |
419 | return mod; | |
420 | } | |
421 | return NULL; | |
422 | } | |
c6b37801 | 423 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
424 | |
425 | #ifdef CONFIG_SMP | |
fbf59bc9 | 426 | |
259354de | 427 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 428 | { |
259354de TH |
429 | return mod->percpu; |
430 | } | |
fbf59bc9 | 431 | |
259354de TH |
432 | static int percpu_modalloc(struct module *mod, |
433 | unsigned long size, unsigned long align) | |
434 | { | |
fbf59bc9 TH |
435 | if (align > PAGE_SIZE) { |
436 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
259354de | 437 | mod->name, align, PAGE_SIZE); |
fbf59bc9 TH |
438 | align = PAGE_SIZE; |
439 | } | |
440 | ||
259354de TH |
441 | mod->percpu = __alloc_reserved_percpu(size, align); |
442 | if (!mod->percpu) { | |
fbf59bc9 | 443 | printk(KERN_WARNING |
d913188c RR |
444 | "%s: Could not allocate %lu bytes percpu data\n", |
445 | mod->name, size); | |
259354de TH |
446 | return -ENOMEM; |
447 | } | |
448 | mod->percpu_size = size; | |
449 | return 0; | |
fbf59bc9 TH |
450 | } |
451 | ||
259354de | 452 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 453 | { |
259354de | 454 | free_percpu(mod->percpu); |
fbf59bc9 TH |
455 | } |
456 | ||
49668688 | 457 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 458 | { |
49668688 | 459 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
460 | } |
461 | ||
259354de TH |
462 | static void percpu_modcopy(struct module *mod, |
463 | const void *from, unsigned long size) | |
6b588c18 TH |
464 | { |
465 | int cpu; | |
466 | ||
467 | for_each_possible_cpu(cpu) | |
259354de | 468 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
469 | } |
470 | ||
10fad5e4 TH |
471 | /** |
472 | * is_module_percpu_address - test whether address is from module static percpu | |
473 | * @addr: address to test | |
474 | * | |
475 | * Test whether @addr belongs to module static percpu area. | |
476 | * | |
477 | * RETURNS: | |
478 | * %true if @addr is from module static percpu area | |
479 | */ | |
480 | bool is_module_percpu_address(unsigned long addr) | |
481 | { | |
482 | struct module *mod; | |
483 | unsigned int cpu; | |
484 | ||
485 | preempt_disable(); | |
486 | ||
487 | list_for_each_entry_rcu(mod, &modules, list) { | |
488 | if (!mod->percpu_size) | |
489 | continue; | |
490 | for_each_possible_cpu(cpu) { | |
491 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
492 | ||
493 | if ((void *)addr >= start && | |
494 | (void *)addr < start + mod->percpu_size) { | |
495 | preempt_enable(); | |
496 | return true; | |
497 | } | |
498 | } | |
499 | } | |
500 | ||
501 | preempt_enable(); | |
502 | return false; | |
6b588c18 TH |
503 | } |
504 | ||
1da177e4 | 505 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 506 | |
259354de | 507 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
508 | { |
509 | return NULL; | |
510 | } | |
259354de TH |
511 | static inline int percpu_modalloc(struct module *mod, |
512 | unsigned long size, unsigned long align) | |
513 | { | |
514 | return -ENOMEM; | |
515 | } | |
516 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 517 | { |
1da177e4 | 518 | } |
49668688 | 519 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
520 | { |
521 | return 0; | |
522 | } | |
259354de TH |
523 | static inline void percpu_modcopy(struct module *mod, |
524 | const void *from, unsigned long size) | |
1da177e4 LT |
525 | { |
526 | /* pcpusec should be 0, and size of that section should be 0. */ | |
527 | BUG_ON(size != 0); | |
528 | } | |
10fad5e4 TH |
529 | bool is_module_percpu_address(unsigned long addr) |
530 | { | |
531 | return false; | |
532 | } | |
6b588c18 | 533 | |
1da177e4 LT |
534 | #endif /* CONFIG_SMP */ |
535 | ||
c988d2b2 MD |
536 | #define MODINFO_ATTR(field) \ |
537 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
538 | { \ | |
539 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
540 | } \ | |
541 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 542 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 543 | { \ |
4befb026 | 544 | return sprintf(buffer, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
545 | } \ |
546 | static int modinfo_##field##_exists(struct module *mod) \ | |
547 | { \ | |
548 | return mod->field != NULL; \ | |
549 | } \ | |
550 | static void free_modinfo_##field(struct module *mod) \ | |
551 | { \ | |
22a8bdeb DW |
552 | kfree(mod->field); \ |
553 | mod->field = NULL; \ | |
c988d2b2 MD |
554 | } \ |
555 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 556 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
557 | .show = show_modinfo_##field, \ |
558 | .setup = setup_modinfo_##field, \ | |
559 | .test = modinfo_##field##_exists, \ | |
560 | .free = free_modinfo_##field, \ | |
561 | }; | |
562 | ||
563 | MODINFO_ATTR(version); | |
564 | MODINFO_ATTR(srcversion); | |
565 | ||
e14af7ee AV |
566 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
567 | ||
03e88ae1 | 568 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
569 | |
570 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
571 | ||
1da177e4 | 572 | /* Init the unload section of the module. */ |
9f85a4bb | 573 | static int module_unload_init(struct module *mod) |
1da177e4 | 574 | { |
9f85a4bb RR |
575 | mod->refptr = alloc_percpu(struct module_ref); |
576 | if (!mod->refptr) | |
577 | return -ENOMEM; | |
578 | ||
2c02dfe7 LT |
579 | INIT_LIST_HEAD(&mod->source_list); |
580 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 581 | |
1da177e4 | 582 | /* Hold reference count during initialization. */ |
5fbfb18d | 583 | __this_cpu_write(mod->refptr->incs, 1); |
1da177e4 LT |
584 | /* Backwards compatibility macros put refcount during init. */ |
585 | mod->waiter = current; | |
9f85a4bb RR |
586 | |
587 | return 0; | |
1da177e4 LT |
588 | } |
589 | ||
1da177e4 LT |
590 | /* Does a already use b? */ |
591 | static int already_uses(struct module *a, struct module *b) | |
592 | { | |
593 | struct module_use *use; | |
594 | ||
2c02dfe7 LT |
595 | list_for_each_entry(use, &b->source_list, source_list) { |
596 | if (use->source == a) { | |
5e124169 | 597 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
598 | return 1; |
599 | } | |
600 | } | |
5e124169 | 601 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
602 | return 0; |
603 | } | |
604 | ||
2c02dfe7 LT |
605 | /* |
606 | * Module a uses b | |
607 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
608 | * - the module_use is added to the list of 'b' sources (so | |
609 | * 'b' can walk the list to see who sourced them), and of 'a' | |
610 | * targets (so 'a' can see what modules it targets). | |
611 | */ | |
612 | static int add_module_usage(struct module *a, struct module *b) | |
613 | { | |
2c02dfe7 LT |
614 | struct module_use *use; |
615 | ||
5e124169 | 616 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
617 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
618 | if (!use) { | |
619 | printk(KERN_WARNING "%s: out of memory loading\n", a->name); | |
620 | return -ENOMEM; | |
621 | } | |
622 | ||
623 | use->source = a; | |
624 | use->target = b; | |
625 | list_add(&use->source_list, &b->source_list); | |
626 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
627 | return 0; |
628 | } | |
629 | ||
75676500 | 630 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 631 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 632 | { |
c8e21ced | 633 | int err; |
270a6c4c | 634 | |
9bea7f23 | 635 | if (b == NULL || already_uses(a, b)) |
218ce735 | 636 | return 0; |
218ce735 | 637 | |
9bea7f23 RR |
638 | /* If module isn't available, we fail. */ |
639 | err = strong_try_module_get(b); | |
c9a3ba55 | 640 | if (err) |
9bea7f23 | 641 | return err; |
1da177e4 | 642 | |
2c02dfe7 LT |
643 | err = add_module_usage(a, b); |
644 | if (err) { | |
1da177e4 | 645 | module_put(b); |
9bea7f23 | 646 | return err; |
1da177e4 | 647 | } |
9bea7f23 | 648 | return 0; |
1da177e4 | 649 | } |
9bea7f23 | 650 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
651 | |
652 | /* Clear the unload stuff of the module. */ | |
653 | static void module_unload_free(struct module *mod) | |
654 | { | |
2c02dfe7 | 655 | struct module_use *use, *tmp; |
1da177e4 | 656 | |
75676500 | 657 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
658 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
659 | struct module *i = use->target; | |
5e124169 | 660 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
661 | module_put(i); |
662 | list_del(&use->source_list); | |
663 | list_del(&use->target_list); | |
664 | kfree(use); | |
1da177e4 | 665 | } |
75676500 | 666 | mutex_unlock(&module_mutex); |
9f85a4bb RR |
667 | |
668 | free_percpu(mod->refptr); | |
1da177e4 LT |
669 | } |
670 | ||
671 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 672 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
673 | { |
674 | int ret = (flags & O_TRUNC); | |
675 | if (ret) | |
fb169793 | 676 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
677 | return ret; |
678 | } | |
679 | #else | |
fb169793 | 680 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
681 | { |
682 | return 0; | |
683 | } | |
684 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
685 | ||
686 | struct stopref | |
687 | { | |
688 | struct module *mod; | |
689 | int flags; | |
690 | int *forced; | |
691 | }; | |
692 | ||
693 | /* Whole machine is stopped with interrupts off when this runs. */ | |
694 | static int __try_stop_module(void *_sref) | |
695 | { | |
696 | struct stopref *sref = _sref; | |
697 | ||
da39ba5e RR |
698 | /* If it's not unused, quit unless we're forcing. */ |
699 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 700 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
701 | return -EWOULDBLOCK; |
702 | } | |
703 | ||
704 | /* Mark it as dying. */ | |
705 | sref->mod->state = MODULE_STATE_GOING; | |
706 | return 0; | |
707 | } | |
708 | ||
709 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
710 | { | |
da39ba5e RR |
711 | if (flags & O_NONBLOCK) { |
712 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 713 | |
9b1a4d38 | 714 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
715 | } else { |
716 | /* We don't need to stop the machine for this. */ | |
717 | mod->state = MODULE_STATE_GOING; | |
718 | synchronize_sched(); | |
719 | return 0; | |
720 | } | |
1da177e4 LT |
721 | } |
722 | ||
bd77c047 | 723 | unsigned long module_refcount(struct module *mod) |
1da177e4 | 724 | { |
bd77c047 | 725 | unsigned long incs = 0, decs = 0; |
720eba31 | 726 | int cpu; |
1da177e4 | 727 | |
720eba31 | 728 | for_each_possible_cpu(cpu) |
5fbfb18d NP |
729 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
730 | /* | |
731 | * ensure the incs are added up after the decs. | |
732 | * module_put ensures incs are visible before decs with smp_wmb. | |
733 | * | |
734 | * This 2-count scheme avoids the situation where the refcount | |
735 | * for CPU0 is read, then CPU0 increments the module refcount, | |
736 | * then CPU1 drops that refcount, then the refcount for CPU1 is | |
737 | * read. We would record a decrement but not its corresponding | |
738 | * increment so we would see a low count (disaster). | |
739 | * | |
740 | * Rare situation? But module_refcount can be preempted, and we | |
741 | * might be tallying up 4096+ CPUs. So it is not impossible. | |
742 | */ | |
743 | smp_rmb(); | |
744 | for_each_possible_cpu(cpu) | |
745 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; | |
746 | return incs - decs; | |
1da177e4 LT |
747 | } |
748 | EXPORT_SYMBOL(module_refcount); | |
749 | ||
750 | /* This exists whether we can unload or not */ | |
751 | static void free_module(struct module *mod); | |
752 | ||
753 | static void wait_for_zero_refcount(struct module *mod) | |
754 | { | |
a6550207 | 755 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 756 | mutex_unlock(&module_mutex); |
1da177e4 | 757 | for (;;) { |
5e124169 | 758 | pr_debug("Looking at refcount...\n"); |
1da177e4 LT |
759 | set_current_state(TASK_UNINTERRUPTIBLE); |
760 | if (module_refcount(mod) == 0) | |
761 | break; | |
762 | schedule(); | |
763 | } | |
764 | current->state = TASK_RUNNING; | |
6389a385 | 765 | mutex_lock(&module_mutex); |
1da177e4 LT |
766 | } |
767 | ||
17da2bd9 HC |
768 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
769 | unsigned int, flags) | |
1da177e4 LT |
770 | { |
771 | struct module *mod; | |
dfff0a06 | 772 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
773 | int ret, forced = 0; |
774 | ||
3d43321b | 775 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
776 | return -EPERM; |
777 | ||
778 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
779 | return -EFAULT; | |
780 | name[MODULE_NAME_LEN-1] = '\0'; | |
781 | ||
3fc1f1e2 TH |
782 | if (mutex_lock_interruptible(&module_mutex) != 0) |
783 | return -EINTR; | |
1da177e4 LT |
784 | |
785 | mod = find_module(name); | |
786 | if (!mod) { | |
787 | ret = -ENOENT; | |
788 | goto out; | |
789 | } | |
790 | ||
2c02dfe7 | 791 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
792 | /* Other modules depend on us: get rid of them first. */ |
793 | ret = -EWOULDBLOCK; | |
794 | goto out; | |
795 | } | |
796 | ||
797 | /* Doing init or already dying? */ | |
798 | if (mod->state != MODULE_STATE_LIVE) { | |
799 | /* FIXME: if (force), slam module count and wake up | |
800 | waiter --RR */ | |
5e124169 | 801 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
802 | ret = -EBUSY; |
803 | goto out; | |
804 | } | |
805 | ||
806 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 807 | if (mod->init && !mod->exit) { |
fb169793 | 808 | forced = try_force_unload(flags); |
1da177e4 LT |
809 | if (!forced) { |
810 | /* This module can't be removed */ | |
811 | ret = -EBUSY; | |
812 | goto out; | |
813 | } | |
814 | } | |
815 | ||
816 | /* Set this up before setting mod->state */ | |
817 | mod->waiter = current; | |
818 | ||
819 | /* Stop the machine so refcounts can't move and disable module. */ | |
820 | ret = try_stop_module(mod, flags, &forced); | |
821 | if (ret != 0) | |
822 | goto out; | |
823 | ||
824 | /* Never wait if forced. */ | |
825 | if (!forced && module_refcount(mod) != 0) | |
826 | wait_for_zero_refcount(mod); | |
827 | ||
df4b565e | 828 | mutex_unlock(&module_mutex); |
25985edc | 829 | /* Final destruction now no one is using it. */ |
df4b565e | 830 | if (mod->exit != NULL) |
1da177e4 | 831 | mod->exit(); |
df4b565e PO |
832 | blocking_notifier_call_chain(&module_notify_list, |
833 | MODULE_STATE_GOING, mod); | |
22a9d645 | 834 | async_synchronize_full(); |
75676500 | 835 | |
e14af7ee | 836 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 837 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 838 | |
75676500 RR |
839 | free_module(mod); |
840 | return 0; | |
841 | out: | |
6389a385 | 842 | mutex_unlock(&module_mutex); |
1da177e4 LT |
843 | return ret; |
844 | } | |
845 | ||
d1e99d7a | 846 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
847 | { |
848 | struct module_use *use; | |
849 | int printed_something = 0; | |
850 | ||
bd77c047 | 851 | seq_printf(m, " %lu ", module_refcount(mod)); |
1da177e4 LT |
852 | |
853 | /* Always include a trailing , so userspace can differentiate | |
854 | between this and the old multi-field proc format. */ | |
2c02dfe7 | 855 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 856 | printed_something = 1; |
2c02dfe7 | 857 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
858 | } |
859 | ||
1da177e4 LT |
860 | if (mod->init != NULL && mod->exit == NULL) { |
861 | printed_something = 1; | |
862 | seq_printf(m, "[permanent],"); | |
863 | } | |
864 | ||
865 | if (!printed_something) | |
866 | seq_printf(m, "-"); | |
867 | } | |
868 | ||
869 | void __symbol_put(const char *symbol) | |
870 | { | |
871 | struct module *owner; | |
1da177e4 | 872 | |
24da1cbf | 873 | preempt_disable(); |
414fd31b | 874 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
875 | BUG(); |
876 | module_put(owner); | |
24da1cbf | 877 | preempt_enable(); |
1da177e4 LT |
878 | } |
879 | EXPORT_SYMBOL(__symbol_put); | |
880 | ||
7d1d16e4 | 881 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
882 | void symbol_put_addr(void *addr) |
883 | { | |
5e376613 | 884 | struct module *modaddr; |
7d1d16e4 | 885 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 886 | |
7d1d16e4 | 887 | if (core_kernel_text(a)) |
5e376613 | 888 | return; |
1da177e4 | 889 | |
a6e6abd5 RR |
890 | /* module_text_address is safe here: we're supposed to have reference |
891 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 892 | modaddr = __module_text_address(a); |
a6e6abd5 | 893 | BUG_ON(!modaddr); |
5e376613 | 894 | module_put(modaddr); |
1da177e4 LT |
895 | } |
896 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
897 | ||
898 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 899 | struct module_kobject *mk, char *buffer) |
1da177e4 | 900 | { |
bd77c047 | 901 | return sprintf(buffer, "%lu\n", module_refcount(mk->mod)); |
1da177e4 LT |
902 | } |
903 | ||
cca3e707 KS |
904 | static struct module_attribute modinfo_refcnt = |
905 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 906 | |
f6a57033 AV |
907 | void module_put(struct module *module) |
908 | { | |
909 | if (module) { | |
e1783a24 | 910 | preempt_disable(); |
5fbfb18d NP |
911 | smp_wmb(); /* see comment in module_refcount */ |
912 | __this_cpu_inc(module->refptr->decs); | |
e1783a24 | 913 | |
ae832d1e | 914 | trace_module_put(module, _RET_IP_); |
f6a57033 AV |
915 | /* Maybe they're waiting for us to drop reference? */ |
916 | if (unlikely(!module_is_live(module))) | |
917 | wake_up_process(module->waiter); | |
e1783a24 | 918 | preempt_enable(); |
f6a57033 AV |
919 | } |
920 | } | |
921 | EXPORT_SYMBOL(module_put); | |
922 | ||
1da177e4 | 923 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 924 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
925 | { |
926 | /* We don't know the usage count, or what modules are using. */ | |
927 | seq_printf(m, " - -"); | |
928 | } | |
929 | ||
930 | static inline void module_unload_free(struct module *mod) | |
931 | { | |
932 | } | |
933 | ||
9bea7f23 | 934 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 935 | { |
9bea7f23 | 936 | return strong_try_module_get(b); |
1da177e4 | 937 | } |
9bea7f23 | 938 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 939 | |
9f85a4bb | 940 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 941 | { |
9f85a4bb | 942 | return 0; |
1da177e4 LT |
943 | } |
944 | #endif /* CONFIG_MODULE_UNLOAD */ | |
945 | ||
53999bf3 KW |
946 | static size_t module_flags_taint(struct module *mod, char *buf) |
947 | { | |
948 | size_t l = 0; | |
949 | ||
950 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) | |
951 | buf[l++] = 'P'; | |
952 | if (mod->taints & (1 << TAINT_OOT_MODULE)) | |
953 | buf[l++] = 'O'; | |
954 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) | |
955 | buf[l++] = 'F'; | |
956 | if (mod->taints & (1 << TAINT_CRAP)) | |
957 | buf[l++] = 'C'; | |
958 | /* | |
959 | * TAINT_FORCED_RMMOD: could be added. | |
960 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
961 | * apply to modules. | |
962 | */ | |
963 | return l; | |
964 | } | |
965 | ||
1f71740a | 966 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 967 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
968 | { |
969 | const char *state = "unknown"; | |
970 | ||
4befb026 | 971 | switch (mk->mod->state) { |
1f71740a KS |
972 | case MODULE_STATE_LIVE: |
973 | state = "live"; | |
974 | break; | |
975 | case MODULE_STATE_COMING: | |
976 | state = "coming"; | |
977 | break; | |
978 | case MODULE_STATE_GOING: | |
979 | state = "going"; | |
980 | break; | |
981 | } | |
982 | return sprintf(buffer, "%s\n", state); | |
983 | } | |
984 | ||
cca3e707 KS |
985 | static struct module_attribute modinfo_initstate = |
986 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 987 | |
88bfa324 KS |
988 | static ssize_t store_uevent(struct module_attribute *mattr, |
989 | struct module_kobject *mk, | |
990 | const char *buffer, size_t count) | |
991 | { | |
992 | enum kobject_action action; | |
993 | ||
994 | if (kobject_action_type(buffer, count, &action) == 0) | |
995 | kobject_uevent(&mk->kobj, action); | |
996 | return count; | |
997 | } | |
998 | ||
cca3e707 KS |
999 | struct module_attribute module_uevent = |
1000 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1001 | ||
1002 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1003 | struct module_kobject *mk, char *buffer) | |
1004 | { | |
1005 | return sprintf(buffer, "%u\n", mk->mod->core_size); | |
1006 | } | |
1007 | ||
1008 | static struct module_attribute modinfo_coresize = | |
1009 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1010 | ||
1011 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1012 | struct module_kobject *mk, char *buffer) | |
1013 | { | |
1014 | return sprintf(buffer, "%u\n", mk->mod->init_size); | |
1015 | } | |
1016 | ||
1017 | static struct module_attribute modinfo_initsize = | |
1018 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1019 | ||
1020 | static ssize_t show_taint(struct module_attribute *mattr, | |
1021 | struct module_kobject *mk, char *buffer) | |
1022 | { | |
1023 | size_t l; | |
1024 | ||
1025 | l = module_flags_taint(mk->mod, buffer); | |
1026 | buffer[l++] = '\n'; | |
1027 | return l; | |
1028 | } | |
1029 | ||
1030 | static struct module_attribute modinfo_taint = | |
1031 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1032 | |
03e88ae1 | 1033 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1034 | &module_uevent, |
03e88ae1 GKH |
1035 | &modinfo_version, |
1036 | &modinfo_srcversion, | |
cca3e707 KS |
1037 | &modinfo_initstate, |
1038 | &modinfo_coresize, | |
1039 | &modinfo_initsize, | |
1040 | &modinfo_taint, | |
03e88ae1 | 1041 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1042 | &modinfo_refcnt, |
03e88ae1 GKH |
1043 | #endif |
1044 | NULL, | |
1045 | }; | |
1046 | ||
1da177e4 LT |
1047 | static const char vermagic[] = VERMAGIC_STRING; |
1048 | ||
c6e665c8 | 1049 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1050 | { |
1051 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1052 | if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8 RR |
1053 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
1054 | mod->name, reason); | |
826e4506 LT |
1055 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1056 | return 0; | |
1057 | #else | |
1058 | return -ENOEXEC; | |
1059 | #endif | |
1060 | } | |
1061 | ||
1da177e4 | 1062 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
1063 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1064 | static unsigned long maybe_relocated(unsigned long crc, | |
1065 | const struct module *crc_owner) | |
1066 | { | |
1067 | #ifdef ARCH_RELOCATES_KCRCTAB | |
1068 | if (crc_owner == NULL) | |
1069 | return crc - (unsigned long)reloc_start; | |
1070 | #endif | |
1071 | return crc; | |
1072 | } | |
1073 | ||
1da177e4 LT |
1074 | static int check_version(Elf_Shdr *sechdrs, |
1075 | unsigned int versindex, | |
1076 | const char *symname, | |
1077 | struct module *mod, | |
d4703aef RR |
1078 | const unsigned long *crc, |
1079 | const struct module *crc_owner) | |
1da177e4 LT |
1080 | { |
1081 | unsigned int i, num_versions; | |
1082 | struct modversion_info *versions; | |
1083 | ||
1084 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1085 | if (!crc) | |
1086 | return 1; | |
1087 | ||
a5dd6970 RR |
1088 | /* No versions at all? modprobe --force does this. */ |
1089 | if (versindex == 0) | |
1090 | return try_to_force_load(mod, symname) == 0; | |
1091 | ||
1da177e4 LT |
1092 | versions = (void *) sechdrs[versindex].sh_addr; |
1093 | num_versions = sechdrs[versindex].sh_size | |
1094 | / sizeof(struct modversion_info); | |
1095 | ||
1096 | for (i = 0; i < num_versions; i++) { | |
1097 | if (strcmp(versions[i].name, symname) != 0) | |
1098 | continue; | |
1099 | ||
d4703aef | 1100 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1101 | return 1; |
5e124169 | 1102 | pr_debug("Found checksum %lX vs module %lX\n", |
d4703aef | 1103 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1104 | goto bad_version; |
1da177e4 | 1105 | } |
826e4506 | 1106 | |
a5dd6970 RR |
1107 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1108 | mod->name, symname); | |
1109 | return 0; | |
826e4506 LT |
1110 | |
1111 | bad_version: | |
1112 | printk("%s: disagrees about version of symbol %s\n", | |
1113 | mod->name, symname); | |
1114 | return 0; | |
1da177e4 LT |
1115 | } |
1116 | ||
1117 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1118 | unsigned int versindex, | |
1119 | struct module *mod) | |
1120 | { | |
1121 | const unsigned long *crc; | |
1da177e4 | 1122 | |
75676500 RR |
1123 | /* Since this should be found in kernel (which can't be removed), |
1124 | * no locking is necessary. */ | |
6560dc16 MF |
1125 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
1126 | &crc, true, false)) | |
1da177e4 | 1127 | BUG(); |
d4703aef RR |
1128 | return check_version(sechdrs, versindex, "module_layout", mod, crc, |
1129 | NULL); | |
1da177e4 LT |
1130 | } |
1131 | ||
91e37a79 RR |
1132 | /* First part is kernel version, which we ignore if module has crcs. */ |
1133 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1134 | bool has_crcs) | |
1da177e4 | 1135 | { |
91e37a79 RR |
1136 | if (has_crcs) { |
1137 | amagic += strcspn(amagic, " "); | |
1138 | bmagic += strcspn(bmagic, " "); | |
1139 | } | |
1da177e4 LT |
1140 | return strcmp(amagic, bmagic) == 0; |
1141 | } | |
1142 | #else | |
1143 | static inline int check_version(Elf_Shdr *sechdrs, | |
1144 | unsigned int versindex, | |
1145 | const char *symname, | |
1146 | struct module *mod, | |
d4703aef RR |
1147 | const unsigned long *crc, |
1148 | const struct module *crc_owner) | |
1da177e4 LT |
1149 | { |
1150 | return 1; | |
1151 | } | |
1152 | ||
1153 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1154 | unsigned int versindex, | |
1155 | struct module *mod) | |
1156 | { | |
1157 | return 1; | |
1158 | } | |
1159 | ||
91e37a79 RR |
1160 | static inline int same_magic(const char *amagic, const char *bmagic, |
1161 | bool has_crcs) | |
1da177e4 LT |
1162 | { |
1163 | return strcmp(amagic, bmagic) == 0; | |
1164 | } | |
1165 | #endif /* CONFIG_MODVERSIONS */ | |
1166 | ||
75676500 | 1167 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1168 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1169 | const struct load_info *info, | |
414fd31b | 1170 | const char *name, |
9bea7f23 | 1171 | char ownername[]) |
1da177e4 LT |
1172 | { |
1173 | struct module *owner; | |
414fd31b | 1174 | const struct kernel_symbol *sym; |
1da177e4 | 1175 | const unsigned long *crc; |
9bea7f23 | 1176 | int err; |
1da177e4 | 1177 | |
75676500 | 1178 | mutex_lock(&module_mutex); |
414fd31b | 1179 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1180 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1181 | if (!sym) |
1182 | goto unlock; | |
1183 | ||
49668688 RR |
1184 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1185 | owner)) { | |
9bea7f23 RR |
1186 | sym = ERR_PTR(-EINVAL); |
1187 | goto getname; | |
1da177e4 | 1188 | } |
9bea7f23 RR |
1189 | |
1190 | err = ref_module(mod, owner); | |
1191 | if (err) { | |
1192 | sym = ERR_PTR(err); | |
1193 | goto getname; | |
1194 | } | |
1195 | ||
1196 | getname: | |
1197 | /* We must make copy under the lock if we failed to get ref. */ | |
1198 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1199 | unlock: | |
75676500 | 1200 | mutex_unlock(&module_mutex); |
218ce735 | 1201 | return sym; |
1da177e4 LT |
1202 | } |
1203 | ||
49668688 RR |
1204 | static const struct kernel_symbol * |
1205 | resolve_symbol_wait(struct module *mod, | |
1206 | const struct load_info *info, | |
1207 | const char *name) | |
9bea7f23 RR |
1208 | { |
1209 | const struct kernel_symbol *ksym; | |
49668688 | 1210 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1211 | |
1212 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1213 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1214 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 RR |
1215 | 30 * HZ) <= 0) { |
1216 | printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n", | |
49668688 | 1217 | mod->name, owner); |
9bea7f23 RR |
1218 | } |
1219 | return ksym; | |
1220 | } | |
1221 | ||
1da177e4 LT |
1222 | /* |
1223 | * /sys/module/foo/sections stuff | |
1224 | * J. Corbet <corbet@lwn.net> | |
1225 | */ | |
8f6d0378 | 1226 | #ifdef CONFIG_SYSFS |
10b465aa | 1227 | |
8f6d0378 | 1228 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1229 | static inline bool sect_empty(const Elf_Shdr *sect) |
1230 | { | |
1231 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1232 | } | |
1233 | ||
a58730c4 RR |
1234 | struct module_sect_attr |
1235 | { | |
1236 | struct module_attribute mattr; | |
1237 | char *name; | |
1238 | unsigned long address; | |
1239 | }; | |
1240 | ||
1241 | struct module_sect_attrs | |
1242 | { | |
1243 | struct attribute_group grp; | |
1244 | unsigned int nsections; | |
1245 | struct module_sect_attr attrs[0]; | |
1246 | }; | |
1247 | ||
1da177e4 | 1248 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1249 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1250 | { |
1251 | struct module_sect_attr *sattr = | |
1252 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1253 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1254 | } |
1255 | ||
04b1db9f IN |
1256 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1257 | { | |
a58730c4 | 1258 | unsigned int section; |
04b1db9f IN |
1259 | |
1260 | for (section = 0; section < sect_attrs->nsections; section++) | |
1261 | kfree(sect_attrs->attrs[section].name); | |
1262 | kfree(sect_attrs); | |
1263 | } | |
1264 | ||
8f6d0378 | 1265 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1266 | { |
1267 | unsigned int nloaded = 0, i, size[2]; | |
1268 | struct module_sect_attrs *sect_attrs; | |
1269 | struct module_sect_attr *sattr; | |
1270 | struct attribute **gattr; | |
22a8bdeb | 1271 | |
1da177e4 | 1272 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1273 | for (i = 0; i < info->hdr->e_shnum; i++) |
1274 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1275 | nloaded++; |
1276 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1277 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1278 | sizeof(sect_attrs->grp.attrs[0])); | |
1279 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1280 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1281 | if (sect_attrs == NULL) | |
1da177e4 LT |
1282 | return; |
1283 | ||
1284 | /* Setup section attributes. */ | |
1285 | sect_attrs->grp.name = "sections"; | |
1286 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1287 | ||
04b1db9f | 1288 | sect_attrs->nsections = 0; |
1da177e4 LT |
1289 | sattr = §_attrs->attrs[0]; |
1290 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1291 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1292 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1293 | if (sect_empty(sec)) | |
35dead42 | 1294 | continue; |
8f6d0378 RR |
1295 | sattr->address = sec->sh_addr; |
1296 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1297 | GFP_KERNEL); |
1298 | if (sattr->name == NULL) | |
1299 | goto out; | |
1300 | sect_attrs->nsections++; | |
361795b1 | 1301 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1302 | sattr->mattr.show = module_sect_show; |
1303 | sattr->mattr.store = NULL; | |
1304 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1305 | sattr->mattr.attr.mode = S_IRUGO; |
1306 | *(gattr++) = &(sattr++)->mattr.attr; | |
1307 | } | |
1308 | *gattr = NULL; | |
1309 | ||
1310 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1311 | goto out; | |
1312 | ||
1313 | mod->sect_attrs = sect_attrs; | |
1314 | return; | |
1315 | out: | |
04b1db9f | 1316 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1317 | } |
1318 | ||
1319 | static void remove_sect_attrs(struct module *mod) | |
1320 | { | |
1321 | if (mod->sect_attrs) { | |
1322 | sysfs_remove_group(&mod->mkobj.kobj, | |
1323 | &mod->sect_attrs->grp); | |
1324 | /* We are positive that no one is using any sect attrs | |
1325 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1326 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1327 | mod->sect_attrs = NULL; |
1328 | } | |
1329 | } | |
1330 | ||
6d760133 RM |
1331 | /* |
1332 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1333 | */ | |
1334 | ||
1335 | struct module_notes_attrs { | |
1336 | struct kobject *dir; | |
1337 | unsigned int notes; | |
1338 | struct bin_attribute attrs[0]; | |
1339 | }; | |
1340 | ||
2c3c8bea | 1341 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1342 | struct bin_attribute *bin_attr, |
1343 | char *buf, loff_t pos, size_t count) | |
1344 | { | |
1345 | /* | |
1346 | * The caller checked the pos and count against our size. | |
1347 | */ | |
1348 | memcpy(buf, bin_attr->private + pos, count); | |
1349 | return count; | |
1350 | } | |
1351 | ||
1352 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1353 | unsigned int i) | |
1354 | { | |
1355 | if (notes_attrs->dir) { | |
1356 | while (i-- > 0) | |
1357 | sysfs_remove_bin_file(notes_attrs->dir, | |
1358 | ¬es_attrs->attrs[i]); | |
e9432093 | 1359 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1360 | } |
1361 | kfree(notes_attrs); | |
1362 | } | |
1363 | ||
8f6d0378 | 1364 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1365 | { |
1366 | unsigned int notes, loaded, i; | |
1367 | struct module_notes_attrs *notes_attrs; | |
1368 | struct bin_attribute *nattr; | |
1369 | ||
ea6bff36 IM |
1370 | /* failed to create section attributes, so can't create notes */ |
1371 | if (!mod->sect_attrs) | |
1372 | return; | |
1373 | ||
6d760133 RM |
1374 | /* Count notes sections and allocate structures. */ |
1375 | notes = 0; | |
8f6d0378 RR |
1376 | for (i = 0; i < info->hdr->e_shnum; i++) |
1377 | if (!sect_empty(&info->sechdrs[i]) && | |
1378 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1379 | ++notes; |
1380 | ||
1381 | if (notes == 0) | |
1382 | return; | |
1383 | ||
1384 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1385 | + notes * sizeof(notes_attrs->attrs[0]), | |
1386 | GFP_KERNEL); | |
1387 | if (notes_attrs == NULL) | |
1388 | return; | |
1389 | ||
1390 | notes_attrs->notes = notes; | |
1391 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1392 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1393 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1394 | continue; |
8f6d0378 | 1395 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1396 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1397 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1398 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1399 | nattr->size = info->sechdrs[i].sh_size; |
1400 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1401 | nattr->read = module_notes_read; |
1402 | ++nattr; | |
1403 | } | |
1404 | ++loaded; | |
1405 | } | |
1406 | ||
4ff6abff | 1407 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1408 | if (!notes_attrs->dir) |
1409 | goto out; | |
1410 | ||
1411 | for (i = 0; i < notes; ++i) | |
1412 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1413 | ¬es_attrs->attrs[i])) | |
1414 | goto out; | |
1415 | ||
1416 | mod->notes_attrs = notes_attrs; | |
1417 | return; | |
1418 | ||
1419 | out: | |
1420 | free_notes_attrs(notes_attrs, i); | |
1421 | } | |
1422 | ||
1423 | static void remove_notes_attrs(struct module *mod) | |
1424 | { | |
1425 | if (mod->notes_attrs) | |
1426 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1427 | } | |
1428 | ||
1da177e4 | 1429 | #else |
04b1db9f | 1430 | |
8f6d0378 RR |
1431 | static inline void add_sect_attrs(struct module *mod, |
1432 | const struct load_info *info) | |
1da177e4 LT |
1433 | { |
1434 | } | |
1435 | ||
1436 | static inline void remove_sect_attrs(struct module *mod) | |
1437 | { | |
1438 | } | |
6d760133 | 1439 | |
8f6d0378 RR |
1440 | static inline void add_notes_attrs(struct module *mod, |
1441 | const struct load_info *info) | |
6d760133 RM |
1442 | { |
1443 | } | |
1444 | ||
1445 | static inline void remove_notes_attrs(struct module *mod) | |
1446 | { | |
1447 | } | |
8f6d0378 | 1448 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1449 | |
80a3d1bb RR |
1450 | static void add_usage_links(struct module *mod) |
1451 | { | |
1452 | #ifdef CONFIG_MODULE_UNLOAD | |
1453 | struct module_use *use; | |
1454 | int nowarn; | |
1455 | ||
75676500 | 1456 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1457 | list_for_each_entry(use, &mod->target_list, target_list) { |
1458 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1459 | &mod->mkobj.kobj, mod->name); | |
1460 | } | |
75676500 | 1461 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1462 | #endif |
1463 | } | |
1464 | ||
1465 | static void del_usage_links(struct module *mod) | |
1466 | { | |
1467 | #ifdef CONFIG_MODULE_UNLOAD | |
1468 | struct module_use *use; | |
1469 | ||
75676500 | 1470 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1471 | list_for_each_entry(use, &mod->target_list, target_list) |
1472 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1473 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1474 | #endif |
1475 | } | |
1476 | ||
6407ebb2 | 1477 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1478 | { |
1479 | struct module_attribute *attr; | |
03e88ae1 | 1480 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1481 | int error = 0; |
1482 | int i; | |
1483 | ||
03e88ae1 GKH |
1484 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1485 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1486 | GFP_KERNEL); | |
1487 | if (!mod->modinfo_attrs) | |
1488 | return -ENOMEM; | |
1489 | ||
1490 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1491 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1492 | if (!attr->test || | |
03e88ae1 GKH |
1493 | (attr->test && attr->test(mod))) { |
1494 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1495 | sysfs_attr_init(&temp_attr->attr); |
03e88ae1 GKH |
1496 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1497 | ++temp_attr; | |
1498 | } | |
c988d2b2 MD |
1499 | } |
1500 | return error; | |
1501 | } | |
1502 | ||
6407ebb2 | 1503 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1504 | { |
1505 | struct module_attribute *attr; | |
1506 | int i; | |
1507 | ||
03e88ae1 GKH |
1508 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1509 | /* pick a field to test for end of list */ | |
1510 | if (!attr->attr.name) | |
1511 | break; | |
c988d2b2 | 1512 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1513 | if (attr->free) |
1514 | attr->free(mod); | |
c988d2b2 | 1515 | } |
03e88ae1 | 1516 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1517 | } |
1da177e4 | 1518 | |
6407ebb2 | 1519 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1520 | { |
1521 | int err; | |
6494a93d | 1522 | struct kobject *kobj; |
1da177e4 | 1523 | |
823bccfc GKH |
1524 | if (!module_sysfs_initialized) { |
1525 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1526 | mod->name); |
1527 | err = -EINVAL; | |
1528 | goto out; | |
1529 | } | |
6494a93d GKH |
1530 | |
1531 | kobj = kset_find_obj(module_kset, mod->name); | |
1532 | if (kobj) { | |
1533 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1534 | kobject_put(kobj); | |
1535 | err = -EINVAL; | |
1536 | goto out; | |
1537 | } | |
1538 | ||
1da177e4 | 1539 | mod->mkobj.mod = mod; |
e17e0f51 | 1540 | |
ac3c8141 GKH |
1541 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1542 | mod->mkobj.kobj.kset = module_kset; | |
1543 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1544 | "%s", mod->name); | |
1545 | if (err) | |
1546 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1547 | |
97c146ef | 1548 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1549 | out: |
1550 | return err; | |
1551 | } | |
1552 | ||
6407ebb2 | 1553 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1554 | const struct load_info *info, |
270a6c4c KS |
1555 | struct kernel_param *kparam, |
1556 | unsigned int num_params) | |
1557 | { | |
1558 | int err; | |
1559 | ||
80a3d1bb RR |
1560 | err = mod_sysfs_init(mod); |
1561 | if (err) | |
1562 | goto out; | |
1563 | ||
4ff6abff | 1564 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1565 | if (!mod->holders_dir) { |
1566 | err = -ENOMEM; | |
270a6c4c | 1567 | goto out_unreg; |
240936e1 | 1568 | } |
270a6c4c | 1569 | |
1da177e4 LT |
1570 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1571 | if (err) | |
270a6c4c | 1572 | goto out_unreg_holders; |
1da177e4 | 1573 | |
c988d2b2 MD |
1574 | err = module_add_modinfo_attrs(mod); |
1575 | if (err) | |
e17e0f51 | 1576 | goto out_unreg_param; |
c988d2b2 | 1577 | |
80a3d1bb | 1578 | add_usage_links(mod); |
8f6d0378 RR |
1579 | add_sect_attrs(mod, info); |
1580 | add_notes_attrs(mod, info); | |
80a3d1bb | 1581 | |
e17e0f51 | 1582 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1583 | return 0; |
1584 | ||
e17e0f51 KS |
1585 | out_unreg_param: |
1586 | module_param_sysfs_remove(mod); | |
270a6c4c | 1587 | out_unreg_holders: |
78a2d906 | 1588 | kobject_put(mod->holders_dir); |
270a6c4c | 1589 | out_unreg: |
e17e0f51 | 1590 | kobject_put(&mod->mkobj.kobj); |
80a3d1bb | 1591 | out: |
1da177e4 LT |
1592 | return err; |
1593 | } | |
34e4e2fe DL |
1594 | |
1595 | static void mod_sysfs_fini(struct module *mod) | |
1596 | { | |
8f6d0378 RR |
1597 | remove_notes_attrs(mod); |
1598 | remove_sect_attrs(mod); | |
34e4e2fe DL |
1599 | kobject_put(&mod->mkobj.kobj); |
1600 | } | |
1601 | ||
8f6d0378 | 1602 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1603 | |
8f6d0378 RR |
1604 | static int mod_sysfs_setup(struct module *mod, |
1605 | const struct load_info *info, | |
6407ebb2 RR |
1606 | struct kernel_param *kparam, |
1607 | unsigned int num_params) | |
1608 | { | |
1609 | return 0; | |
1610 | } | |
1611 | ||
34e4e2fe DL |
1612 | static void mod_sysfs_fini(struct module *mod) |
1613 | { | |
1614 | } | |
1615 | ||
36b0360d RR |
1616 | static void module_remove_modinfo_attrs(struct module *mod) |
1617 | { | |
1618 | } | |
1619 | ||
80a3d1bb RR |
1620 | static void del_usage_links(struct module *mod) |
1621 | { | |
1622 | } | |
1623 | ||
34e4e2fe | 1624 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1625 | |
36b0360d | 1626 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1627 | { |
80a3d1bb | 1628 | del_usage_links(mod); |
c988d2b2 | 1629 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1630 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1631 | kobject_put(mod->mkobj.drivers_dir); |
1632 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1633 | mod_sysfs_fini(mod); |
1da177e4 LT |
1634 | } |
1635 | ||
1636 | /* | |
1637 | * unlink the module with the whole machine is stopped with interrupts off | |
1638 | * - this defends against kallsyms not taking locks | |
1639 | */ | |
1640 | static int __unlink_module(void *_mod) | |
1641 | { | |
1642 | struct module *mod = _mod; | |
1643 | list_del(&mod->list); | |
5336377d | 1644 | module_bug_cleanup(mod); |
1da177e4 LT |
1645 | return 0; |
1646 | } | |
1647 | ||
84e1c6bb MC |
1648 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1649 | /* | |
1650 | * LKM RO/NX protection: protect module's text/ro-data | |
1651 | * from modification and any data from execution. | |
1652 | */ | |
1653 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) | |
1654 | { | |
1655 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); | |
1656 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); | |
1657 | ||
1658 | if (end_pfn > begin_pfn) | |
1659 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1660 | } | |
1661 | ||
1662 | static void set_section_ro_nx(void *base, | |
1663 | unsigned long text_size, | |
1664 | unsigned long ro_size, | |
1665 | unsigned long total_size) | |
1666 | { | |
1667 | /* begin and end PFNs of the current subsection */ | |
1668 | unsigned long begin_pfn; | |
1669 | unsigned long end_pfn; | |
1670 | ||
1671 | /* | |
1672 | * Set RO for module text and RO-data: | |
1673 | * - Always protect first page. | |
1674 | * - Do not protect last partial page. | |
1675 | */ | |
1676 | if (ro_size > 0) | |
1677 | set_page_attributes(base, base + ro_size, set_memory_ro); | |
1678 | ||
1679 | /* | |
1680 | * Set NX permissions for module data: | |
1681 | * - Do not protect first partial page. | |
1682 | * - Always protect last page. | |
1683 | */ | |
1684 | if (total_size > text_size) { | |
1685 | begin_pfn = PFN_UP((unsigned long)base + text_size); | |
1686 | end_pfn = PFN_UP((unsigned long)base + total_size); | |
1687 | if (end_pfn > begin_pfn) | |
1688 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1689 | } | |
1690 | } | |
1691 | ||
01526ed0 JG |
1692 | static void unset_module_core_ro_nx(struct module *mod) |
1693 | { | |
1694 | set_page_attributes(mod->module_core + mod->core_text_size, | |
1695 | mod->module_core + mod->core_size, | |
1696 | set_memory_x); | |
1697 | set_page_attributes(mod->module_core, | |
1698 | mod->module_core + mod->core_ro_size, | |
1699 | set_memory_rw); | |
1700 | } | |
1701 | ||
1702 | static void unset_module_init_ro_nx(struct module *mod) | |
1703 | { | |
1704 | set_page_attributes(mod->module_init + mod->init_text_size, | |
1705 | mod->module_init + mod->init_size, | |
1706 | set_memory_x); | |
1707 | set_page_attributes(mod->module_init, | |
1708 | mod->module_init + mod->init_ro_size, | |
1709 | set_memory_rw); | |
84e1c6bb MC |
1710 | } |
1711 | ||
1712 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1713 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
1714 | { |
1715 | struct module *mod; | |
1716 | ||
1717 | mutex_lock(&module_mutex); | |
1718 | list_for_each_entry_rcu(mod, &modules, list) { | |
1719 | if ((mod->module_core) && (mod->core_text_size)) { | |
1720 | set_page_attributes(mod->module_core, | |
1721 | mod->module_core + mod->core_text_size, | |
1722 | set_memory_rw); | |
1723 | } | |
1724 | if ((mod->module_init) && (mod->init_text_size)) { | |
1725 | set_page_attributes(mod->module_init, | |
1726 | mod->module_init + mod->init_text_size, | |
1727 | set_memory_rw); | |
1728 | } | |
1729 | } | |
1730 | mutex_unlock(&module_mutex); | |
1731 | } | |
1732 | ||
1733 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1734 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
1735 | { |
1736 | struct module *mod; | |
1737 | ||
1738 | mutex_lock(&module_mutex); | |
1739 | list_for_each_entry_rcu(mod, &modules, list) { | |
1740 | if ((mod->module_core) && (mod->core_text_size)) { | |
1741 | set_page_attributes(mod->module_core, | |
1742 | mod->module_core + mod->core_text_size, | |
1743 | set_memory_ro); | |
1744 | } | |
1745 | if ((mod->module_init) && (mod->init_text_size)) { | |
1746 | set_page_attributes(mod->module_init, | |
1747 | mod->module_init + mod->init_text_size, | |
1748 | set_memory_ro); | |
1749 | } | |
1750 | } | |
1751 | mutex_unlock(&module_mutex); | |
1752 | } | |
1753 | #else | |
1754 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } | |
01526ed0 JG |
1755 | static void unset_module_core_ro_nx(struct module *mod) { } |
1756 | static void unset_module_init_ro_nx(struct module *mod) { } | |
84e1c6bb MC |
1757 | #endif |
1758 | ||
74e08fcf JB |
1759 | void __weak module_free(struct module *mod, void *module_region) |
1760 | { | |
1761 | vfree(module_region); | |
1762 | } | |
1763 | ||
1764 | void __weak module_arch_cleanup(struct module *mod) | |
1765 | { | |
1766 | } | |
1767 | ||
75676500 | 1768 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1769 | static void free_module(struct module *mod) |
1770 | { | |
7ead8b83 LZ |
1771 | trace_module_free(mod); |
1772 | ||
1da177e4 | 1773 | /* Delete from various lists */ |
75676500 | 1774 | mutex_lock(&module_mutex); |
9b1a4d38 | 1775 | stop_machine(__unlink_module, mod, NULL); |
75676500 | 1776 | mutex_unlock(&module_mutex); |
36b0360d | 1777 | mod_sysfs_teardown(mod); |
1da177e4 | 1778 | |
b82bab4b JB |
1779 | /* Remove dynamic debug info */ |
1780 | ddebug_remove_module(mod->name); | |
1781 | ||
1da177e4 LT |
1782 | /* Arch-specific cleanup. */ |
1783 | module_arch_cleanup(mod); | |
1784 | ||
1785 | /* Module unload stuff */ | |
1786 | module_unload_free(mod); | |
1787 | ||
e180a6b7 RR |
1788 | /* Free any allocated parameters. */ |
1789 | destroy_params(mod->kp, mod->num_kp); | |
1790 | ||
1da177e4 | 1791 | /* This may be NULL, but that's OK */ |
01526ed0 | 1792 | unset_module_init_ro_nx(mod); |
1da177e4 LT |
1793 | module_free(mod, mod->module_init); |
1794 | kfree(mod->args); | |
259354de | 1795 | percpu_modfree(mod); |
9f85a4bb | 1796 | |
fbb9ce95 IM |
1797 | /* Free lock-classes: */ |
1798 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1799 | ||
1da177e4 | 1800 | /* Finally, free the core (containing the module structure) */ |
01526ed0 | 1801 | unset_module_core_ro_nx(mod); |
1da177e4 | 1802 | module_free(mod, mod->module_core); |
eb8cdec4 BS |
1803 | |
1804 | #ifdef CONFIG_MPU | |
1805 | update_protections(current->mm); | |
1806 | #endif | |
1da177e4 LT |
1807 | } |
1808 | ||
1809 | void *__symbol_get(const char *symbol) | |
1810 | { | |
1811 | struct module *owner; | |
414fd31b | 1812 | const struct kernel_symbol *sym; |
1da177e4 | 1813 | |
24da1cbf | 1814 | preempt_disable(); |
414fd31b TA |
1815 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1816 | if (sym && strong_try_module_get(owner)) | |
1817 | sym = NULL; | |
24da1cbf | 1818 | preempt_enable(); |
1da177e4 | 1819 | |
414fd31b | 1820 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1821 | } |
1822 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1823 | ||
eea8b54d AN |
1824 | /* |
1825 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1826 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1827 | * |
1828 | * You must hold the module_mutex. | |
eea8b54d AN |
1829 | */ |
1830 | static int verify_export_symbols(struct module *mod) | |
1831 | { | |
b211104d | 1832 | unsigned int i; |
eea8b54d | 1833 | struct module *owner; |
b211104d RR |
1834 | const struct kernel_symbol *s; |
1835 | struct { | |
1836 | const struct kernel_symbol *sym; | |
1837 | unsigned int num; | |
1838 | } arr[] = { | |
1839 | { mod->syms, mod->num_syms }, | |
1840 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1841 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1842 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1843 | { mod->unused_syms, mod->num_unused_syms }, |
1844 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1845 | #endif |
b211104d | 1846 | }; |
eea8b54d | 1847 | |
b211104d RR |
1848 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1849 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 1850 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d RR |
1851 | printk(KERN_ERR |
1852 | "%s: exports duplicate symbol %s" | |
1853 | " (owned by %s)\n", | |
1854 | mod->name, s->name, module_name(owner)); | |
1855 | return -ENOEXEC; | |
1856 | } | |
eea8b54d | 1857 | } |
b211104d RR |
1858 | } |
1859 | return 0; | |
eea8b54d AN |
1860 | } |
1861 | ||
9a4b9708 | 1862 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
1863 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
1864 | { | |
1865 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
1866 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 1867 | unsigned long secbase; |
49668688 | 1868 | unsigned int i; |
1da177e4 | 1869 | int ret = 0; |
414fd31b | 1870 | const struct kernel_symbol *ksym; |
1da177e4 | 1871 | |
49668688 RR |
1872 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
1873 | const char *name = info->strtab + sym[i].st_name; | |
1874 | ||
1da177e4 LT |
1875 | switch (sym[i].st_shndx) { |
1876 | case SHN_COMMON: | |
1877 | /* We compiled with -fno-common. These are not | |
1878 | supposed to happen. */ | |
5e124169 | 1879 | pr_debug("Common symbol: %s\n", name); |
1da177e4 LT |
1880 | printk("%s: please compile with -fno-common\n", |
1881 | mod->name); | |
1882 | ret = -ENOEXEC; | |
1883 | break; | |
1884 | ||
1885 | case SHN_ABS: | |
1886 | /* Don't need to do anything */ | |
5e124169 | 1887 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
1888 | (long)sym[i].st_value); |
1889 | break; | |
1890 | ||
1891 | case SHN_UNDEF: | |
49668688 | 1892 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 1893 | /* Ok if resolved. */ |
9bea7f23 | 1894 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 1895 | sym[i].st_value = ksym->value; |
1da177e4 | 1896 | break; |
414fd31b TA |
1897 | } |
1898 | ||
1da177e4 | 1899 | /* Ok if weak. */ |
9bea7f23 | 1900 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
1901 | break; |
1902 | ||
9bea7f23 | 1903 | printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n", |
49668688 | 1904 | mod->name, name, PTR_ERR(ksym)); |
9bea7f23 | 1905 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
1906 | break; |
1907 | ||
1908 | default: | |
1909 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 1910 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 1911 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 1912 | else |
49668688 | 1913 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
1914 | sym[i].st_value += secbase; |
1915 | break; | |
1916 | } | |
1917 | } | |
1918 | ||
1919 | return ret; | |
1920 | } | |
1921 | ||
74e08fcf JB |
1922 | int __weak apply_relocate(Elf_Shdr *sechdrs, |
1923 | const char *strtab, | |
1924 | unsigned int symindex, | |
1925 | unsigned int relsec, | |
1926 | struct module *me) | |
1927 | { | |
1928 | pr_err("module %s: REL relocation unsupported\n", me->name); | |
1929 | return -ENOEXEC; | |
1930 | } | |
1931 | ||
1932 | int __weak apply_relocate_add(Elf_Shdr *sechdrs, | |
1933 | const char *strtab, | |
1934 | unsigned int symindex, | |
1935 | unsigned int relsec, | |
1936 | struct module *me) | |
1937 | { | |
1938 | pr_err("module %s: RELA relocation unsupported\n", me->name); | |
1939 | return -ENOEXEC; | |
1940 | } | |
1941 | ||
49668688 | 1942 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
1943 | { |
1944 | unsigned int i; | |
1945 | int err = 0; | |
1946 | ||
1947 | /* Now do relocations. */ | |
49668688 RR |
1948 | for (i = 1; i < info->hdr->e_shnum; i++) { |
1949 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
1950 | |
1951 | /* Not a valid relocation section? */ | |
49668688 | 1952 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
1953 | continue; |
1954 | ||
1955 | /* Don't bother with non-allocated sections */ | |
49668688 | 1956 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
1957 | continue; |
1958 | ||
49668688 RR |
1959 | if (info->sechdrs[i].sh_type == SHT_REL) |
1960 | err = apply_relocate(info->sechdrs, info->strtab, | |
1961 | info->index.sym, i, mod); | |
1962 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
1963 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
1964 | info->index.sym, i, mod); | |
22e268eb RR |
1965 | if (err < 0) |
1966 | break; | |
1967 | } | |
1968 | return err; | |
1969 | } | |
1970 | ||
088af9a6 HD |
1971 | /* Additional bytes needed by arch in front of individual sections */ |
1972 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1973 | unsigned int section) | |
1974 | { | |
1975 | /* default implementation just returns zero */ | |
1976 | return 0; | |
1977 | } | |
1978 | ||
1da177e4 | 1979 | /* Update size with this section: return offset. */ |
088af9a6 HD |
1980 | static long get_offset(struct module *mod, unsigned int *size, |
1981 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
1982 | { |
1983 | long ret; | |
1984 | ||
088af9a6 | 1985 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1986 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1987 | *size = ret + sechdr->sh_size; | |
1988 | return ret; | |
1989 | } | |
1990 | ||
1991 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1992 | might -- code, read-only data, read-write data, small data. Tally | |
1993 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1994 | belongs in init. */ | |
49668688 | 1995 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
1996 | { |
1997 | static unsigned long const masks[][2] = { | |
1998 | /* NOTE: all executable code must be the first section | |
1999 | * in this array; otherwise modify the text_size | |
2000 | * finder in the two loops below */ | |
2001 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2002 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
2003 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2004 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2005 | }; | |
2006 | unsigned int m, i; | |
2007 | ||
49668688 RR |
2008 | for (i = 0; i < info->hdr->e_shnum; i++) |
2009 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2010 | |
5e124169 | 2011 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2012 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2013 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2014 | Elf_Shdr *s = &info->sechdrs[i]; | |
2015 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2016 | |
2017 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2018 | || (s->sh_flags & masks[m][1]) | |
2019 | || s->sh_entsize != ~0UL | |
49668688 | 2020 | || strstarts(sname, ".init")) |
1da177e4 | 2021 | continue; |
088af9a6 | 2022 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
5e124169 | 2023 | pr_debug("\t%s\n", sname); |
1da177e4 | 2024 | } |
84e1c6bb MC |
2025 | switch (m) { |
2026 | case 0: /* executable */ | |
2027 | mod->core_size = debug_align(mod->core_size); | |
1da177e4 | 2028 | mod->core_text_size = mod->core_size; |
84e1c6bb MC |
2029 | break; |
2030 | case 1: /* RO: text and ro-data */ | |
2031 | mod->core_size = debug_align(mod->core_size); | |
2032 | mod->core_ro_size = mod->core_size; | |
2033 | break; | |
2034 | case 3: /* whole core */ | |
2035 | mod->core_size = debug_align(mod->core_size); | |
2036 | break; | |
2037 | } | |
1da177e4 LT |
2038 | } |
2039 | ||
5e124169 | 2040 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2041 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2042 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2043 | Elf_Shdr *s = &info->sechdrs[i]; | |
2044 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2045 | |
2046 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2047 | || (s->sh_flags & masks[m][1]) | |
2048 | || s->sh_entsize != ~0UL | |
49668688 | 2049 | || !strstarts(sname, ".init")) |
1da177e4 | 2050 | continue; |
088af9a6 | 2051 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 | 2052 | | INIT_OFFSET_MASK); |
5e124169 | 2053 | pr_debug("\t%s\n", sname); |
1da177e4 | 2054 | } |
84e1c6bb MC |
2055 | switch (m) { |
2056 | case 0: /* executable */ | |
2057 | mod->init_size = debug_align(mod->init_size); | |
1da177e4 | 2058 | mod->init_text_size = mod->init_size; |
84e1c6bb MC |
2059 | break; |
2060 | case 1: /* RO: text and ro-data */ | |
2061 | mod->init_size = debug_align(mod->init_size); | |
2062 | mod->init_ro_size = mod->init_size; | |
2063 | break; | |
2064 | case 3: /* whole init */ | |
2065 | mod->init_size = debug_align(mod->init_size); | |
2066 | break; | |
2067 | } | |
1da177e4 LT |
2068 | } |
2069 | } | |
2070 | ||
1da177e4 LT |
2071 | static void set_license(struct module *mod, const char *license) |
2072 | { | |
2073 | if (!license) | |
2074 | license = "unspecified"; | |
2075 | ||
fa3ba2e8 | 2076 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2077 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 2078 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
2079 | "kernel.\n", mod->name, license); |
2080 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
2081 | } |
2082 | } | |
2083 | ||
2084 | /* Parse tag=value strings from .modinfo section */ | |
2085 | static char *next_string(char *string, unsigned long *secsize) | |
2086 | { | |
2087 | /* Skip non-zero chars */ | |
2088 | while (string[0]) { | |
2089 | string++; | |
2090 | if ((*secsize)-- <= 1) | |
2091 | return NULL; | |
2092 | } | |
2093 | ||
2094 | /* Skip any zero padding. */ | |
2095 | while (!string[0]) { | |
2096 | string++; | |
2097 | if ((*secsize)-- <= 1) | |
2098 | return NULL; | |
2099 | } | |
2100 | return string; | |
2101 | } | |
2102 | ||
49668688 | 2103 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2104 | { |
2105 | char *p; | |
2106 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2107 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2108 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2109 | |
49668688 | 2110 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2111 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2112 | return p + taglen + 1; | |
2113 | } | |
2114 | return NULL; | |
2115 | } | |
2116 | ||
49668688 | 2117 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2118 | { |
2119 | struct module_attribute *attr; | |
2120 | int i; | |
2121 | ||
2122 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2123 | if (attr->setup) | |
49668688 | 2124 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2125 | } |
2126 | } | |
c988d2b2 | 2127 | |
a263f776 RR |
2128 | static void free_modinfo(struct module *mod) |
2129 | { | |
2130 | struct module_attribute *attr; | |
2131 | int i; | |
2132 | ||
2133 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2134 | if (attr->free) | |
2135 | attr->free(mod); | |
2136 | } | |
2137 | } | |
2138 | ||
1da177e4 | 2139 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2140 | |
2141 | /* lookup symbol in given range of kernel_symbols */ | |
2142 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2143 | const struct kernel_symbol *start, | |
2144 | const struct kernel_symbol *stop) | |
2145 | { | |
9d63487f AIB |
2146 | return bsearch(name, start, stop - start, |
2147 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2148 | } |
2149 | ||
ca4787b7 TA |
2150 | static int is_exported(const char *name, unsigned long value, |
2151 | const struct module *mod) | |
1da177e4 | 2152 | { |
ca4787b7 TA |
2153 | const struct kernel_symbol *ks; |
2154 | if (!mod) | |
2155 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2156 | else |
ca4787b7 TA |
2157 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2158 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2159 | } |
2160 | ||
2161 | /* As per nm */ | |
eded41c1 | 2162 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2163 | { |
eded41c1 RR |
2164 | const Elf_Shdr *sechdrs = info->sechdrs; |
2165 | ||
1da177e4 LT |
2166 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2167 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2168 | return 'v'; | |
2169 | else | |
2170 | return 'w'; | |
2171 | } | |
2172 | if (sym->st_shndx == SHN_UNDEF) | |
2173 | return 'U'; | |
2174 | if (sym->st_shndx == SHN_ABS) | |
2175 | return 'a'; | |
2176 | if (sym->st_shndx >= SHN_LORESERVE) | |
2177 | return '?'; | |
2178 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2179 | return 't'; | |
2180 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2181 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2182 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2183 | return 'r'; | |
2184 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2185 | return 'g'; | |
2186 | else | |
2187 | return 'd'; | |
2188 | } | |
2189 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2190 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2191 | return 's'; | |
2192 | else | |
2193 | return 'b'; | |
2194 | } | |
eded41c1 RR |
2195 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2196 | ".debug")) { | |
1da177e4 | 2197 | return 'n'; |
eded41c1 | 2198 | } |
1da177e4 LT |
2199 | return '?'; |
2200 | } | |
2201 | ||
4a496226 JB |
2202 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
2203 | unsigned int shnum) | |
2204 | { | |
2205 | const Elf_Shdr *sec; | |
2206 | ||
2207 | if (src->st_shndx == SHN_UNDEF | |
2208 | || src->st_shndx >= shnum | |
2209 | || !src->st_name) | |
2210 | return false; | |
2211 | ||
2212 | sec = sechdrs + src->st_shndx; | |
2213 | if (!(sec->sh_flags & SHF_ALLOC) | |
2214 | #ifndef CONFIG_KALLSYMS_ALL | |
2215 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2216 | #endif | |
2217 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2218 | return false; | |
2219 | ||
2220 | return true; | |
2221 | } | |
2222 | ||
48fd1188 KC |
2223 | /* |
2224 | * We only allocate and copy the strings needed by the parts of symtab | |
2225 | * we keep. This is simple, but has the effect of making multiple | |
2226 | * copies of duplicates. We could be more sophisticated, see | |
2227 | * linux-kernel thread starting with | |
2228 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2229 | */ | |
49668688 | 2230 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2231 | { |
49668688 RR |
2232 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2233 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2234 | const Elf_Sym *src; |
48fd1188 | 2235 | unsigned int i, nsrc, ndst, strtab_size; |
4a496226 JB |
2236 | |
2237 | /* Put symbol section at end of init part of module. */ | |
2238 | symsect->sh_flags |= SHF_ALLOC; | |
2239 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
49668688 | 2240 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2241 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2242 | |
49668688 | 2243 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2244 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2245 | |
48fd1188 KC |
2246 | /* Compute total space required for the core symbols' strtab. */ |
2247 | for (ndst = i = strtab_size = 1; i < nsrc; ++i, ++src) | |
49668688 | 2248 | if (is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) { |
48fd1188 KC |
2249 | strtab_size += strlen(&info->strtab[src->st_name]) + 1; |
2250 | ndst++; | |
554bdfe5 | 2251 | } |
4a496226 JB |
2252 | |
2253 | /* Append room for core symbols at end of core part. */ | |
49668688 | 2254 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
48fd1188 KC |
2255 | info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
2256 | mod->core_size += strtab_size; | |
4a496226 | 2257 | |
554bdfe5 JB |
2258 | /* Put string table section at end of init part of module. */ |
2259 | strsect->sh_flags |= SHF_ALLOC; | |
2260 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
49668688 | 2261 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2262 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
4a496226 JB |
2263 | } |
2264 | ||
811d66a0 | 2265 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2266 | { |
4a496226 JB |
2267 | unsigned int i, ndst; |
2268 | const Elf_Sym *src; | |
2269 | Elf_Sym *dst; | |
554bdfe5 | 2270 | char *s; |
eded41c1 | 2271 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2272 | |
eded41c1 RR |
2273 | mod->symtab = (void *)symsec->sh_addr; |
2274 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae RR |
2275 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2276 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2277 | |
2278 | /* Set types up while we still have access to sections. */ | |
2279 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2280 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2281 | |
d913188c | 2282 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
48fd1188 | 2283 | mod->core_strtab = s = mod->module_core + info->stroffs; |
4a496226 JB |
2284 | src = mod->symtab; |
2285 | *dst = *src; | |
48fd1188 | 2286 | *s++ = 0; |
4a496226 | 2287 | for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { |
eded41c1 | 2288 | if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) |
4a496226 | 2289 | continue; |
48fd1188 | 2290 | |
4a496226 | 2291 | dst[ndst] = *src; |
48fd1188 KC |
2292 | dst[ndst++].st_name = s - mod->core_strtab; |
2293 | s += strlcpy(s, &mod->strtab[src->st_name], KSYM_NAME_LEN) + 1; | |
4a496226 JB |
2294 | } |
2295 | mod->core_num_syms = ndst; | |
1da177e4 LT |
2296 | } |
2297 | #else | |
49668688 | 2298 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2299 | { |
2300 | } | |
3ae91c21 | 2301 | |
abbce906 | 2302 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2303 | { |
2304 | } | |
2305 | #endif /* CONFIG_KALLSYMS */ | |
2306 | ||
e9d376f0 | 2307 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2308 | { |
811d66a0 RR |
2309 | if (!debug) |
2310 | return; | |
e9d376f0 JB |
2311 | #ifdef CONFIG_DYNAMIC_DEBUG |
2312 | if (ddebug_add_module(debug, num, debug->modname)) | |
2313 | printk(KERN_ERR "dynamic debug error adding module: %s\n", | |
2314 | debug->modname); | |
2315 | #endif | |
5e458cc0 | 2316 | } |
346e15be | 2317 | |
ff49d74a YS |
2318 | static void dynamic_debug_remove(struct _ddebug *debug) |
2319 | { | |
2320 | if (debug) | |
2321 | ddebug_remove_module(debug->modname); | |
2322 | } | |
2323 | ||
74e08fcf JB |
2324 | void * __weak module_alloc(unsigned long size) |
2325 | { | |
2326 | return size == 0 ? NULL : vmalloc_exec(size); | |
2327 | } | |
2328 | ||
3a642e99 RR |
2329 | static void *module_alloc_update_bounds(unsigned long size) |
2330 | { | |
2331 | void *ret = module_alloc(size); | |
2332 | ||
2333 | if (ret) { | |
75676500 | 2334 | mutex_lock(&module_mutex); |
3a642e99 RR |
2335 | /* Update module bounds. */ |
2336 | if ((unsigned long)ret < module_addr_min) | |
2337 | module_addr_min = (unsigned long)ret; | |
2338 | if ((unsigned long)ret + size > module_addr_max) | |
2339 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2340 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2341 | } |
2342 | return ret; | |
2343 | } | |
2344 | ||
4f2294b6 | 2345 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2346 | static void kmemleak_load_module(const struct module *mod, |
2347 | const struct load_info *info) | |
4f2294b6 CM |
2348 | { |
2349 | unsigned int i; | |
2350 | ||
2351 | /* only scan the sections containing data */ | |
c017b4be | 2352 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2353 | |
49668688 RR |
2354 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2355 | const char *name = info->secstrings + info->sechdrs[i].sh_name; | |
2356 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC)) | |
4f2294b6 | 2357 | continue; |
49668688 | 2358 | if (!strstarts(name, ".data") && !strstarts(name, ".bss")) |
4f2294b6 CM |
2359 | continue; |
2360 | ||
49668688 RR |
2361 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2362 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2363 | } |
2364 | } | |
2365 | #else | |
49668688 RR |
2366 | static inline void kmemleak_load_module(const struct module *mod, |
2367 | const struct load_info *info) | |
4f2294b6 CM |
2368 | { |
2369 | } | |
2370 | #endif | |
2371 | ||
6526c534 | 2372 | /* Sets info->hdr and info->len. */ |
d913188c RR |
2373 | static int copy_and_check(struct load_info *info, |
2374 | const void __user *umod, unsigned long len, | |
2375 | const char __user *uargs) | |
40dd2560 RR |
2376 | { |
2377 | int err; | |
2378 | Elf_Ehdr *hdr; | |
2379 | ||
2380 | if (len < sizeof(*hdr)) | |
2381 | return -ENOEXEC; | |
2382 | ||
2383 | /* Suck in entire file: we'll want most of it. */ | |
2384 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
3264d3f9 | 2385 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) |
40dd2560 RR |
2386 | return -ENOMEM; |
2387 | ||
2388 | if (copy_from_user(hdr, umod, len) != 0) { | |
2389 | err = -EFAULT; | |
2390 | goto free_hdr; | |
2391 | } | |
2392 | ||
2393 | /* Sanity checks against insmoding binaries or wrong arch, | |
2394 | weird elf version */ | |
2395 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2396 | || hdr->e_type != ET_REL | |
2397 | || !elf_check_arch(hdr) | |
2398 | || hdr->e_shentsize != sizeof(Elf_Shdr)) { | |
2399 | err = -ENOEXEC; | |
2400 | goto free_hdr; | |
2401 | } | |
2402 | ||
2403 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { | |
2404 | err = -ENOEXEC; | |
2405 | goto free_hdr; | |
2406 | } | |
d913188c | 2407 | |
3264d3f9 LT |
2408 | info->hdr = hdr; |
2409 | info->len = len; | |
40dd2560 RR |
2410 | return 0; |
2411 | ||
2412 | free_hdr: | |
2413 | vfree(hdr); | |
2414 | return err; | |
2415 | } | |
2416 | ||
d913188c RR |
2417 | static void free_copy(struct load_info *info) |
2418 | { | |
d913188c RR |
2419 | vfree(info->hdr); |
2420 | } | |
2421 | ||
8b5f61a7 RR |
2422 | static int rewrite_section_headers(struct load_info *info) |
2423 | { | |
2424 | unsigned int i; | |
2425 | ||
2426 | /* This should always be true, but let's be sure. */ | |
2427 | info->sechdrs[0].sh_addr = 0; | |
2428 | ||
2429 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2430 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2431 | if (shdr->sh_type != SHT_NOBITS | |
2432 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
2433 | printk(KERN_ERR "Module len %lu truncated\n", | |
2434 | info->len); | |
2435 | return -ENOEXEC; | |
2436 | } | |
2437 | ||
2438 | /* Mark all sections sh_addr with their address in the | |
2439 | temporary image. */ | |
2440 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2441 | ||
2442 | #ifndef CONFIG_MODULE_UNLOAD | |
2443 | /* Don't load .exit sections */ | |
2444 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2445 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2446 | #endif | |
8b5f61a7 | 2447 | } |
d6df72a0 RR |
2448 | |
2449 | /* Track but don't keep modinfo and version sections. */ | |
49668688 RR |
2450 | info->index.vers = find_sec(info, "__versions"); |
2451 | info->index.info = find_sec(info, ".modinfo"); | |
d6df72a0 RR |
2452 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2453 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2454 | return 0; |
2455 | } | |
2456 | ||
3264d3f9 LT |
2457 | /* |
2458 | * Set up our basic convenience variables (pointers to section headers, | |
2459 | * search for module section index etc), and do some basic section | |
2460 | * verification. | |
2461 | * | |
2462 | * Return the temporary module pointer (we'll replace it with the final | |
2463 | * one when we move the module sections around). | |
2464 | */ | |
2465 | static struct module *setup_load_info(struct load_info *info) | |
2466 | { | |
2467 | unsigned int i; | |
8b5f61a7 | 2468 | int err; |
3264d3f9 LT |
2469 | struct module *mod; |
2470 | ||
2471 | /* Set up the convenience variables */ | |
2472 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2473 | info->secstrings = (void *)info->hdr |
2474 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2475 | |
8b5f61a7 RR |
2476 | err = rewrite_section_headers(info); |
2477 | if (err) | |
2478 | return ERR_PTR(err); | |
3264d3f9 | 2479 | |
8b5f61a7 RR |
2480 | /* Find internal symbols and strings. */ |
2481 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2482 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2483 | info->index.sym = i; | |
2484 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2485 | info->strtab = (char *)info->hdr |
2486 | + info->sechdrs[info->index.str].sh_offset; | |
2487 | break; | |
3264d3f9 | 2488 | } |
3264d3f9 LT |
2489 | } |
2490 | ||
49668688 | 2491 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 LT |
2492 | if (!info->index.mod) { |
2493 | printk(KERN_WARNING "No module found in object\n"); | |
2494 | return ERR_PTR(-ENOEXEC); | |
2495 | } | |
2496 | /* This is temporary: point mod into copy of data. */ | |
2497 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2498 | ||
2499 | if (info->index.sym == 0) { | |
2500 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
2501 | mod->name); | |
2502 | return ERR_PTR(-ENOEXEC); | |
2503 | } | |
2504 | ||
49668688 | 2505 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2506 | |
3264d3f9 LT |
2507 | /* Check module struct version now, before we try to use module. */ |
2508 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2509 | return ERR_PTR(-ENOEXEC); | |
2510 | ||
2511 | return mod; | |
3264d3f9 LT |
2512 | } |
2513 | ||
49668688 | 2514 | static int check_modinfo(struct module *mod, struct load_info *info) |
40dd2560 | 2515 | { |
49668688 | 2516 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2517 | int err; |
2518 | ||
2519 | /* This is allowed: modprobe --force will invalidate it. */ | |
2520 | if (!modmagic) { | |
2521 | err = try_to_force_load(mod, "bad vermagic"); | |
2522 | if (err) | |
2523 | return err; | |
49668688 | 2524 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
40dd2560 RR |
2525 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
2526 | mod->name, modmagic, vermagic); | |
2527 | return -ENOEXEC; | |
2528 | } | |
2529 | ||
2449b8ba BH |
2530 | if (!get_modinfo(info, "intree")) |
2531 | add_taint_module(mod, TAINT_OOT_MODULE); | |
2532 | ||
49668688 | 2533 | if (get_modinfo(info, "staging")) { |
40dd2560 RR |
2534 | add_taint_module(mod, TAINT_CRAP); |
2535 | printk(KERN_WARNING "%s: module is from the staging directory," | |
2536 | " the quality is unknown, you have been warned.\n", | |
2537 | mod->name); | |
2538 | } | |
22e268eb RR |
2539 | |
2540 | /* Set up license info based on the info section */ | |
49668688 | 2541 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2542 | |
40dd2560 RR |
2543 | return 0; |
2544 | } | |
2545 | ||
811d66a0 | 2546 | static void find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2547 | { |
49668688 | 2548 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2549 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2550 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2551 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2552 | mod->crcs = section_addr(info, "__kcrctab"); |
2553 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2554 | sizeof(*mod->gpl_syms), |
2555 | &mod->num_gpl_syms); | |
49668688 RR |
2556 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2557 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2558 | "__ksymtab_gpl_future", |
2559 | sizeof(*mod->gpl_future_syms), | |
2560 | &mod->num_gpl_future_syms); | |
49668688 | 2561 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2562 | |
2563 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2564 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2565 | sizeof(*mod->unused_syms), |
2566 | &mod->num_unused_syms); | |
49668688 RR |
2567 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2568 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2569 | sizeof(*mod->unused_gpl_syms), |
2570 | &mod->num_unused_gpl_syms); | |
49668688 | 2571 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2572 | #endif |
2573 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2574 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb LT |
2575 | sizeof(*mod->ctors), &mod->num_ctors); |
2576 | #endif | |
2577 | ||
2578 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2579 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2580 | sizeof(*mod->tracepoints_ptrs), | |
2581 | &mod->num_tracepoints); | |
f91a13bb | 2582 | #endif |
bf5438fc JB |
2583 | #ifdef HAVE_JUMP_LABEL |
2584 | mod->jump_entries = section_objs(info, "__jump_table", | |
2585 | sizeof(*mod->jump_entries), | |
2586 | &mod->num_jump_entries); | |
2587 | #endif | |
f91a13bb | 2588 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2589 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2590 | sizeof(*mod->trace_events), |
2591 | &mod->num_trace_events); | |
2592 | /* | |
2593 | * This section contains pointers to allocated objects in the trace | |
2594 | * code and not scanning it leads to false positives. | |
2595 | */ | |
2596 | kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) * | |
2597 | mod->num_trace_events, GFP_KERNEL); | |
2598 | #endif | |
13b9b6e7 SR |
2599 | #ifdef CONFIG_TRACING |
2600 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2601 | sizeof(*mod->trace_bprintk_fmt_start), | |
2602 | &mod->num_trace_bprintk_fmt); | |
2603 | /* | |
2604 | * This section contains pointers to allocated objects in the trace | |
2605 | * code and not scanning it leads to false positives. | |
2606 | */ | |
2607 | kmemleak_scan_area(mod->trace_bprintk_fmt_start, | |
2608 | sizeof(*mod->trace_bprintk_fmt_start) * | |
2609 | mod->num_trace_bprintk_fmt, GFP_KERNEL); | |
2610 | #endif | |
f91a13bb LT |
2611 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2612 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2613 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2614 | sizeof(*mod->ftrace_callsites), |
2615 | &mod->num_ftrace_callsites); | |
2616 | #endif | |
22e268eb | 2617 | |
811d66a0 RR |
2618 | mod->extable = section_objs(info, "__ex_table", |
2619 | sizeof(*mod->extable), &mod->num_exentries); | |
2620 | ||
49668688 | 2621 | if (section_addr(info, "__obsparm")) |
22e268eb RR |
2622 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2623 | mod->name); | |
811d66a0 RR |
2624 | |
2625 | info->debug = section_objs(info, "__verbose", | |
2626 | sizeof(*info->debug), &info->num_debug); | |
f91a13bb LT |
2627 | } |
2628 | ||
49668688 | 2629 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2630 | { |
2631 | int i; | |
2632 | void *ptr; | |
2633 | ||
2634 | /* Do the allocs. */ | |
2635 | ptr = module_alloc_update_bounds(mod->core_size); | |
2636 | /* | |
2637 | * The pointer to this block is stored in the module structure | |
2638 | * which is inside the block. Just mark it as not being a | |
2639 | * leak. | |
2640 | */ | |
2641 | kmemleak_not_leak(ptr); | |
2642 | if (!ptr) | |
d913188c | 2643 | return -ENOMEM; |
65b8a9b4 LT |
2644 | |
2645 | memset(ptr, 0, mod->core_size); | |
2646 | mod->module_core = ptr; | |
2647 | ||
2648 | ptr = module_alloc_update_bounds(mod->init_size); | |
2649 | /* | |
2650 | * The pointer to this block is stored in the module structure | |
2651 | * which is inside the block. This block doesn't need to be | |
2652 | * scanned as it contains data and code that will be freed | |
2653 | * after the module is initialized. | |
2654 | */ | |
2655 | kmemleak_ignore(ptr); | |
2656 | if (!ptr && mod->init_size) { | |
2657 | module_free(mod, mod->module_core); | |
d913188c | 2658 | return -ENOMEM; |
65b8a9b4 LT |
2659 | } |
2660 | memset(ptr, 0, mod->init_size); | |
2661 | mod->module_init = ptr; | |
2662 | ||
2663 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 2664 | pr_debug("final section addresses:\n"); |
49668688 | 2665 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2666 | void *dest; |
49668688 | 2667 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2668 | |
49668688 | 2669 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2670 | continue; |
2671 | ||
49668688 | 2672 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
65b8a9b4 | 2673 | dest = mod->module_init |
49668688 | 2674 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 2675 | else |
49668688 | 2676 | dest = mod->module_core + shdr->sh_entsize; |
65b8a9b4 | 2677 | |
49668688 RR |
2678 | if (shdr->sh_type != SHT_NOBITS) |
2679 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 2680 | /* Update sh_addr to point to copy in image. */ |
49668688 | 2681 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
2682 | pr_debug("\t0x%lx %s\n", |
2683 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 2684 | } |
d913188c RR |
2685 | |
2686 | return 0; | |
65b8a9b4 LT |
2687 | } |
2688 | ||
49668688 | 2689 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
2690 | { |
2691 | /* | |
2692 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2693 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2694 | * using GPL-only symbols it needs. | |
2695 | */ | |
2696 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
2697 | add_taint(TAINT_PROPRIETARY_MODULE); | |
2698 | ||
2699 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2700 | if (strcmp(mod->name, "driverloader") == 0) | |
2701 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
2702 | ||
2703 | #ifdef CONFIG_MODVERSIONS | |
2704 | if ((mod->num_syms && !mod->crcs) | |
2705 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2706 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
2707 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2708 | || (mod->num_unused_syms && !mod->unused_crcs) | |
2709 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
2710 | #endif | |
2711 | ) { | |
2712 | return try_to_force_load(mod, | |
2713 | "no versions for exported symbols"); | |
2714 | } | |
2715 | #endif | |
2716 | return 0; | |
2717 | } | |
2718 | ||
2719 | static void flush_module_icache(const struct module *mod) | |
2720 | { | |
2721 | mm_segment_t old_fs; | |
2722 | ||
2723 | /* flush the icache in correct context */ | |
2724 | old_fs = get_fs(); | |
2725 | set_fs(KERNEL_DS); | |
2726 | ||
2727 | /* | |
2728 | * Flush the instruction cache, since we've played with text. | |
2729 | * Do it before processing of module parameters, so the module | |
2730 | * can provide parameter accessor functions of its own. | |
2731 | */ | |
2732 | if (mod->module_init) | |
2733 | flush_icache_range((unsigned long)mod->module_init, | |
2734 | (unsigned long)mod->module_init | |
2735 | + mod->init_size); | |
2736 | flush_icache_range((unsigned long)mod->module_core, | |
2737 | (unsigned long)mod->module_core + mod->core_size); | |
2738 | ||
2739 | set_fs(old_fs); | |
2740 | } | |
2741 | ||
74e08fcf JB |
2742 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
2743 | Elf_Shdr *sechdrs, | |
2744 | char *secstrings, | |
2745 | struct module *mod) | |
2746 | { | |
2747 | return 0; | |
2748 | } | |
2749 | ||
d913188c | 2750 | static struct module *layout_and_allocate(struct load_info *info) |
1da177e4 | 2751 | { |
d913188c | 2752 | /* Module within temporary copy. */ |
1da177e4 | 2753 | struct module *mod; |
49668688 | 2754 | Elf_Shdr *pcpusec; |
d913188c | 2755 | int err; |
3ae91c21 | 2756 | |
d913188c RR |
2757 | mod = setup_load_info(info); |
2758 | if (IS_ERR(mod)) | |
2759 | return mod; | |
1da177e4 | 2760 | |
49668688 | 2761 | err = check_modinfo(mod, info); |
40dd2560 RR |
2762 | if (err) |
2763 | return ERR_PTR(err); | |
1da177e4 | 2764 | |
1da177e4 | 2765 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
2766 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
2767 | info->secstrings, mod); | |
1da177e4 | 2768 | if (err < 0) |
6526c534 | 2769 | goto out; |
1da177e4 | 2770 | |
49668688 RR |
2771 | pcpusec = &info->sechdrs[info->index.pcpu]; |
2772 | if (pcpusec->sh_size) { | |
1da177e4 | 2773 | /* We have a special allocation for this section. */ |
49668688 RR |
2774 | err = percpu_modalloc(mod, |
2775 | pcpusec->sh_size, pcpusec->sh_addralign); | |
259354de | 2776 | if (err) |
6526c534 | 2777 | goto out; |
49668688 | 2778 | pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
2779 | } |
2780 | ||
2781 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2782 | this is done generically; there doesn't appear to be any | |
2783 | special cases for the architectures. */ | |
49668688 | 2784 | layout_sections(mod, info); |
49668688 | 2785 | layout_symtab(mod, info); |
1da177e4 | 2786 | |
65b8a9b4 | 2787 | /* Allocate and move to the final place */ |
49668688 | 2788 | err = move_module(mod, info); |
d913188c | 2789 | if (err) |
48fd1188 | 2790 | goto free_percpu; |
d913188c RR |
2791 | |
2792 | /* Module has been copied to its final place now: return it. */ | |
2793 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 2794 | kmemleak_load_module(mod, info); |
d913188c RR |
2795 | return mod; |
2796 | ||
d913188c RR |
2797 | free_percpu: |
2798 | percpu_modfree(mod); | |
6526c534 | 2799 | out: |
d913188c RR |
2800 | return ERR_PTR(err); |
2801 | } | |
2802 | ||
2803 | /* mod is no longer valid after this! */ | |
2804 | static void module_deallocate(struct module *mod, struct load_info *info) | |
2805 | { | |
d913188c RR |
2806 | percpu_modfree(mod); |
2807 | module_free(mod, mod->module_init); | |
2808 | module_free(mod, mod->module_core); | |
2809 | } | |
2810 | ||
74e08fcf JB |
2811 | int __weak module_finalize(const Elf_Ehdr *hdr, |
2812 | const Elf_Shdr *sechdrs, | |
2813 | struct module *me) | |
2814 | { | |
2815 | return 0; | |
2816 | } | |
2817 | ||
811d66a0 RR |
2818 | static int post_relocation(struct module *mod, const struct load_info *info) |
2819 | { | |
51f3d0f4 | 2820 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
2821 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
2822 | ||
2823 | /* Copy relocated percpu area over. */ | |
2824 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
2825 | info->sechdrs[info->index.pcpu].sh_size); | |
2826 | ||
51f3d0f4 | 2827 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
2828 | add_kallsyms(mod, info); |
2829 | ||
2830 | /* Arch-specific module finalizing. */ | |
2831 | return module_finalize(info->hdr, info->sechdrs, mod); | |
2832 | } | |
2833 | ||
d913188c RR |
2834 | /* Allocate and load the module: note that size of section 0 is always |
2835 | zero, and we rely on this for optional sections. */ | |
51f3d0f4 | 2836 | static struct module *load_module(void __user *umod, |
d913188c RR |
2837 | unsigned long len, |
2838 | const char __user *uargs) | |
2839 | { | |
2840 | struct load_info info = { NULL, }; | |
2841 | struct module *mod; | |
2842 | long err; | |
d913188c | 2843 | |
5e124169 | 2844 | pr_debug("load_module: umod=%p, len=%lu, uargs=%p\n", |
d913188c RR |
2845 | umod, len, uargs); |
2846 | ||
2847 | /* Copy in the blobs from userspace, check they are vaguely sane. */ | |
2848 | err = copy_and_check(&info, umod, len, uargs); | |
2849 | if (err) | |
2850 | return ERR_PTR(err); | |
2851 | ||
2852 | /* Figure out module layout, and allocate all the memory. */ | |
2853 | mod = layout_and_allocate(&info); | |
65b8a9b4 LT |
2854 | if (IS_ERR(mod)) { |
2855 | err = PTR_ERR(mod); | |
d913188c | 2856 | goto free_copy; |
1da177e4 | 2857 | } |
1da177e4 | 2858 | |
49668688 | 2859 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
2860 | err = module_unload_init(mod); |
2861 | if (err) | |
d913188c | 2862 | goto free_module; |
1da177e4 | 2863 | |
22e268eb RR |
2864 | /* Now we've got everything in the final locations, we can |
2865 | * find optional sections. */ | |
49668688 | 2866 | find_module_sections(mod, &info); |
9b37ccfc | 2867 | |
49668688 | 2868 | err = check_module_license_and_versions(mod); |
22e268eb RR |
2869 | if (err) |
2870 | goto free_unload; | |
9841d61d | 2871 | |
c988d2b2 | 2872 | /* Set up MODINFO_ATTR fields */ |
49668688 | 2873 | setup_modinfo(mod, &info); |
c988d2b2 | 2874 | |
1da177e4 | 2875 | /* Fix up syms, so that st_value is a pointer to location. */ |
49668688 | 2876 | err = simplify_symbols(mod, &info); |
1da177e4 | 2877 | if (err < 0) |
d913188c | 2878 | goto free_modinfo; |
1da177e4 | 2879 | |
49668688 | 2880 | err = apply_relocations(mod, &info); |
22e268eb | 2881 | if (err < 0) |
d913188c | 2882 | goto free_modinfo; |
1da177e4 | 2883 | |
811d66a0 | 2884 | err = post_relocation(mod, &info); |
1da177e4 | 2885 | if (err < 0) |
d913188c | 2886 | goto free_modinfo; |
1da177e4 | 2887 | |
22e268eb | 2888 | flush_module_icache(mod); |
378bac82 | 2889 | |
6526c534 RR |
2890 | /* Now copy in args */ |
2891 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
2892 | if (IS_ERR(mod->args)) { | |
2893 | err = PTR_ERR(mod->args); | |
2894 | goto free_arch_cleanup; | |
2895 | } | |
8d3b33f6 | 2896 | |
51f3d0f4 | 2897 | /* Mark state as coming so strong_try_module_get() ignores us. */ |
d913188c RR |
2898 | mod->state = MODULE_STATE_COMING; |
2899 | ||
bb9d3d56 | 2900 | /* Now sew it into the lists so we can get lockdep and oops |
25985edc | 2901 | * info during argument parsing. No one should access us, since |
d72b3751 AK |
2902 | * strong_try_module_get() will fail. |
2903 | * lockdep/oops can run asynchronous, so use the RCU list insertion | |
2904 | * function to insert in a way safe to concurrent readers. | |
2905 | * The mutex protects against concurrent writers. | |
2906 | */ | |
75676500 | 2907 | mutex_lock(&module_mutex); |
3bafeb62 LT |
2908 | if (find_module(mod->name)) { |
2909 | err = -EEXIST; | |
be593f4c | 2910 | goto unlock; |
3bafeb62 LT |
2911 | } |
2912 | ||
811d66a0 | 2913 | /* This has to be done once we're sure module name is unique. */ |
1cd0d6c3 | 2914 | dynamic_debug_setup(info.debug, info.num_debug); |
ff49d74a | 2915 | |
be593f4c RR |
2916 | /* Find duplicate symbols */ |
2917 | err = verify_export_symbols(mod); | |
2918 | if (err < 0) | |
ff49d74a | 2919 | goto ddebug; |
be593f4c | 2920 | |
5336377d | 2921 | module_bug_finalize(info.hdr, info.sechdrs, mod); |
d72b3751 | 2922 | list_add_rcu(&mod->list, &modules); |
75676500 | 2923 | mutex_unlock(&module_mutex); |
bb9d3d56 | 2924 | |
51f3d0f4 | 2925 | /* Module is ready to execute: parsing args may do that. */ |
e180a6b7 | 2926 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
1da177e4 | 2927 | if (err < 0) |
bb9d3d56 | 2928 | goto unlink; |
1da177e4 | 2929 | |
51f3d0f4 | 2930 | /* Link in to syfs. */ |
8f6d0378 | 2931 | err = mod_sysfs_setup(mod, &info, mod->kp, mod->num_kp); |
1da177e4 | 2932 | if (err < 0) |
bb9d3d56 | 2933 | goto unlink; |
80a3d1bb | 2934 | |
48fd1188 | 2935 | /* Get rid of temporary copy. */ |
d913188c | 2936 | free_copy(&info); |
1da177e4 LT |
2937 | |
2938 | /* Done! */ | |
51f3d0f4 | 2939 | trace_module_load(mod); |
1da177e4 LT |
2940 | return mod; |
2941 | ||
bb9d3d56 | 2942 | unlink: |
75676500 | 2943 | mutex_lock(&module_mutex); |
e91defa2 RR |
2944 | /* Unlink carefully: kallsyms could be walking list. */ |
2945 | list_del_rcu(&mod->list); | |
5336377d LT |
2946 | module_bug_cleanup(mod); |
2947 | ||
ff49d74a | 2948 | ddebug: |
1cd0d6c3 | 2949 | dynamic_debug_remove(info.debug); |
be593f4c | 2950 | unlock: |
75676500 | 2951 | mutex_unlock(&module_mutex); |
e91defa2 | 2952 | synchronize_sched(); |
6526c534 RR |
2953 | kfree(mod->args); |
2954 | free_arch_cleanup: | |
1da177e4 | 2955 | module_arch_cleanup(mod); |
d913188c | 2956 | free_modinfo: |
a263f776 | 2957 | free_modinfo(mod); |
22e268eb | 2958 | free_unload: |
1da177e4 | 2959 | module_unload_free(mod); |
d913188c RR |
2960 | free_module: |
2961 | module_deallocate(mod, &info); | |
2962 | free_copy: | |
2963 | free_copy(&info); | |
6fe2e70b | 2964 | return ERR_PTR(err); |
1da177e4 LT |
2965 | } |
2966 | ||
b99b87f7 PO |
2967 | /* Call module constructors. */ |
2968 | static void do_mod_ctors(struct module *mod) | |
2969 | { | |
2970 | #ifdef CONFIG_CONSTRUCTORS | |
2971 | unsigned long i; | |
2972 | ||
2973 | for (i = 0; i < mod->num_ctors; i++) | |
2974 | mod->ctors[i](); | |
2975 | #endif | |
2976 | } | |
2977 | ||
1da177e4 | 2978 | /* This is where the real work happens */ |
17da2bd9 HC |
2979 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2980 | unsigned long, len, const char __user *, uargs) | |
1da177e4 LT |
2981 | { |
2982 | struct module *mod; | |
2983 | int ret = 0; | |
2984 | ||
2985 | /* Must have permission */ | |
3d43321b | 2986 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
1da177e4 LT |
2987 | return -EPERM; |
2988 | ||
1da177e4 LT |
2989 | /* Do all the hard work */ |
2990 | mod = load_module(umod, len, uargs); | |
75676500 | 2991 | if (IS_ERR(mod)) |
1da177e4 | 2992 | return PTR_ERR(mod); |
1da177e4 | 2993 | |
e041c683 AS |
2994 | blocking_notifier_call_chain(&module_notify_list, |
2995 | MODULE_STATE_COMING, mod); | |
1da177e4 | 2996 | |
94462ad3 SR |
2997 | /* Set RO and NX regions for core */ |
2998 | set_section_ro_nx(mod->module_core, | |
2999 | mod->core_text_size, | |
3000 | mod->core_ro_size, | |
3001 | mod->core_size); | |
3002 | ||
3003 | /* Set RO and NX regions for init */ | |
3004 | set_section_ro_nx(mod->module_init, | |
3005 | mod->init_text_size, | |
3006 | mod->init_ro_size, | |
3007 | mod->init_size); | |
3008 | ||
b99b87f7 | 3009 | do_mod_ctors(mod); |
1da177e4 LT |
3010 | /* Start the module */ |
3011 | if (mod->init != NULL) | |
59f9415f | 3012 | ret = do_one_initcall(mod->init); |
1da177e4 LT |
3013 | if (ret < 0) { |
3014 | /* Init routine failed: abort. Try to protect us from | |
3015 | buggy refcounters. */ | |
3016 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 3017 | synchronize_sched(); |
af49d924 | 3018 | module_put(mod); |
df4b565e PO |
3019 | blocking_notifier_call_chain(&module_notify_list, |
3020 | MODULE_STATE_GOING, mod); | |
af49d924 | 3021 | free_module(mod); |
c9a3ba55 | 3022 | wake_up(&module_wq); |
1da177e4 LT |
3023 | return ret; |
3024 | } | |
e24e2e64 | 3025 | if (ret > 0) { |
ad361c98 JP |
3026 | printk(KERN_WARNING |
3027 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" | |
3028 | "%s: loading module anyway...\n", | |
e24e2e64 AD |
3029 | __func__, mod->name, ret, |
3030 | __func__); | |
3031 | dump_stack(); | |
3032 | } | |
1da177e4 | 3033 | |
6c5db22d | 3034 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 3035 | mod->state = MODULE_STATE_LIVE; |
6c5db22d | 3036 | wake_up(&module_wq); |
0deddf43 MH |
3037 | blocking_notifier_call_chain(&module_notify_list, |
3038 | MODULE_STATE_LIVE, mod); | |
6c5db22d | 3039 | |
d6de2c80 LT |
3040 | /* We need to finish all async code before the module init sequence is done */ |
3041 | async_synchronize_full(); | |
3042 | ||
6c5db22d | 3043 | mutex_lock(&module_mutex); |
1da177e4 LT |
3044 | /* Drop initial reference. */ |
3045 | module_put(mod); | |
ad6561df | 3046 | trim_init_extable(mod); |
4a496226 JB |
3047 | #ifdef CONFIG_KALLSYMS |
3048 | mod->num_symtab = mod->core_num_syms; | |
3049 | mod->symtab = mod->core_symtab; | |
554bdfe5 | 3050 | mod->strtab = mod->core_strtab; |
4a496226 | 3051 | #endif |
01526ed0 | 3052 | unset_module_init_ro_nx(mod); |
1da177e4 LT |
3053 | module_free(mod, mod->module_init); |
3054 | mod->module_init = NULL; | |
3055 | mod->init_size = 0; | |
4d10380e | 3056 | mod->init_ro_size = 0; |
1da177e4 | 3057 | mod->init_text_size = 0; |
6389a385 | 3058 | mutex_unlock(&module_mutex); |
1da177e4 LT |
3059 | |
3060 | return 0; | |
3061 | } | |
3062 | ||
3063 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3064 | { | |
3065 | return ((void *)addr >= start && (void *)addr < start + size); | |
3066 | } | |
3067 | ||
3068 | #ifdef CONFIG_KALLSYMS | |
3069 | /* | |
3070 | * This ignores the intensely annoying "mapping symbols" found | |
3071 | * in ARM ELF files: $a, $t and $d. | |
3072 | */ | |
3073 | static inline int is_arm_mapping_symbol(const char *str) | |
3074 | { | |
22a8bdeb | 3075 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
3076 | && (str[2] == '\0' || str[2] == '.'); |
3077 | } | |
3078 | ||
3079 | static const char *get_ksymbol(struct module *mod, | |
3080 | unsigned long addr, | |
3081 | unsigned long *size, | |
3082 | unsigned long *offset) | |
3083 | { | |
3084 | unsigned int i, best = 0; | |
3085 | unsigned long nextval; | |
3086 | ||
3087 | /* At worse, next value is at end of module */ | |
a06f6211 | 3088 | if (within_module_init(addr, mod)) |
1da177e4 | 3089 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 3090 | else |
1da177e4 LT |
3091 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
3092 | ||
25985edc | 3093 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3094 | starts real symbols at 1). */ |
1da177e4 LT |
3095 | for (i = 1; i < mod->num_symtab; i++) { |
3096 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
3097 | continue; | |
3098 | ||
3099 | /* We ignore unnamed symbols: they're uninformative | |
3100 | * and inserted at a whim. */ | |
3101 | if (mod->symtab[i].st_value <= addr | |
3102 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
3103 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3104 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3105 | best = i; | |
3106 | if (mod->symtab[i].st_value > addr | |
3107 | && mod->symtab[i].st_value < nextval | |
3108 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3109 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3110 | nextval = mod->symtab[i].st_value; | |
3111 | } | |
3112 | ||
3113 | if (!best) | |
3114 | return NULL; | |
3115 | ||
ffb45122 AD |
3116 | if (size) |
3117 | *size = nextval - mod->symtab[best].st_value; | |
3118 | if (offset) | |
3119 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
3120 | return mod->strtab + mod->symtab[best].st_name; |
3121 | } | |
3122 | ||
6dd06c9f RR |
3123 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3124 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3125 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3126 | unsigned long *size, |
3127 | unsigned long *offset, | |
3128 | char **modname, | |
3129 | char *namebuf) | |
1da177e4 LT |
3130 | { |
3131 | struct module *mod; | |
cb2a5205 | 3132 | const char *ret = NULL; |
1da177e4 | 3133 | |
cb2a5205 | 3134 | preempt_disable(); |
d72b3751 | 3135 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
3136 | if (within_module_init(addr, mod) || |
3137 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
3138 | if (modname) |
3139 | *modname = mod->name; | |
cb2a5205 RR |
3140 | ret = get_ksymbol(mod, addr, size, offset); |
3141 | break; | |
1da177e4 LT |
3142 | } |
3143 | } | |
6dd06c9f RR |
3144 | /* Make a copy in here where it's safe */ |
3145 | if (ret) { | |
3146 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3147 | ret = namebuf; | |
3148 | } | |
cb2a5205 | 3149 | preempt_enable(); |
92dfc9dc | 3150 | return ret; |
1da177e4 LT |
3151 | } |
3152 | ||
9d65cb4a AD |
3153 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3154 | { | |
3155 | struct module *mod; | |
3156 | ||
cb2a5205 | 3157 | preempt_disable(); |
d72b3751 | 3158 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
3159 | if (within_module_init(addr, mod) || |
3160 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
3161 | const char *sym; |
3162 | ||
3163 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3164 | if (!sym) | |
3165 | goto out; | |
9281acea | 3166 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3167 | preempt_enable(); |
9d65cb4a AD |
3168 | return 0; |
3169 | } | |
3170 | } | |
3171 | out: | |
cb2a5205 | 3172 | preempt_enable(); |
9d65cb4a AD |
3173 | return -ERANGE; |
3174 | } | |
3175 | ||
a5c43dae AD |
3176 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3177 | unsigned long *offset, char *modname, char *name) | |
3178 | { | |
3179 | struct module *mod; | |
3180 | ||
cb2a5205 | 3181 | preempt_disable(); |
d72b3751 | 3182 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
3183 | if (within_module_init(addr, mod) || |
3184 | within_module_core(addr, mod)) { | |
a5c43dae AD |
3185 | const char *sym; |
3186 | ||
3187 | sym = get_ksymbol(mod, addr, size, offset); | |
3188 | if (!sym) | |
3189 | goto out; | |
3190 | if (modname) | |
9281acea | 3191 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3192 | if (name) |
9281acea | 3193 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3194 | preempt_enable(); |
a5c43dae AD |
3195 | return 0; |
3196 | } | |
3197 | } | |
3198 | out: | |
cb2a5205 | 3199 | preempt_enable(); |
a5c43dae AD |
3200 | return -ERANGE; |
3201 | } | |
3202 | ||
ea07890a AD |
3203 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3204 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3205 | { |
3206 | struct module *mod; | |
3207 | ||
cb2a5205 | 3208 | preempt_disable(); |
d72b3751 | 3209 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
3210 | if (symnum < mod->num_symtab) { |
3211 | *value = mod->symtab[symnum].st_value; | |
3212 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 3213 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
3214 | KSYM_NAME_LEN); |
3215 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 3216 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3217 | preempt_enable(); |
ea07890a | 3218 | return 0; |
1da177e4 LT |
3219 | } |
3220 | symnum -= mod->num_symtab; | |
3221 | } | |
cb2a5205 | 3222 | preempt_enable(); |
ea07890a | 3223 | return -ERANGE; |
1da177e4 LT |
3224 | } |
3225 | ||
3226 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3227 | { | |
3228 | unsigned int i; | |
3229 | ||
3230 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
3231 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3232 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
3233 | return mod->symtab[i].st_value; |
3234 | return 0; | |
3235 | } | |
3236 | ||
3237 | /* Look for this name: can be of form module:name. */ | |
3238 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3239 | { | |
3240 | struct module *mod; | |
3241 | char *colon; | |
3242 | unsigned long ret = 0; | |
3243 | ||
3244 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3245 | preempt_disable(); |
1da177e4 LT |
3246 | if ((colon = strchr(name, ':')) != NULL) { |
3247 | *colon = '\0'; | |
3248 | if ((mod = find_module(name)) != NULL) | |
3249 | ret = mod_find_symname(mod, colon+1); | |
3250 | *colon = ':'; | |
3251 | } else { | |
d72b3751 | 3252 | list_for_each_entry_rcu(mod, &modules, list) |
1da177e4 LT |
3253 | if ((ret = mod_find_symname(mod, name)) != 0) |
3254 | break; | |
3255 | } | |
cb2a5205 | 3256 | preempt_enable(); |
1da177e4 LT |
3257 | return ret; |
3258 | } | |
75a66614 AK |
3259 | |
3260 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3261 | struct module *, unsigned long), | |
3262 | void *data) | |
3263 | { | |
3264 | struct module *mod; | |
3265 | unsigned int i; | |
3266 | int ret; | |
3267 | ||
3268 | list_for_each_entry(mod, &modules, list) { | |
3269 | for (i = 0; i < mod->num_symtab; i++) { | |
3270 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3271 | mod, mod->symtab[i].st_value); | |
3272 | if (ret != 0) | |
3273 | return ret; | |
3274 | } | |
3275 | } | |
3276 | return 0; | |
3277 | } | |
1da177e4 LT |
3278 | #endif /* CONFIG_KALLSYMS */ |
3279 | ||
21aa9280 | 3280 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3281 | { |
3282 | int bx = 0; | |
3283 | ||
21aa9280 AV |
3284 | if (mod->taints || |
3285 | mod->state == MODULE_STATE_GOING || | |
3286 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3287 | buf[bx++] = '('; |
cca3e707 | 3288 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
3289 | /* Show a - for module-is-being-unloaded */ |
3290 | if (mod->state == MODULE_STATE_GOING) | |
3291 | buf[bx++] = '-'; | |
3292 | /* Show a + for module-is-being-loaded */ | |
3293 | if (mod->state == MODULE_STATE_COMING) | |
3294 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3295 | buf[bx++] = ')'; |
3296 | } | |
3297 | buf[bx] = '\0'; | |
3298 | ||
3299 | return buf; | |
3300 | } | |
3301 | ||
3b5d5c6b AD |
3302 | #ifdef CONFIG_PROC_FS |
3303 | /* Called by the /proc file system to return a list of modules. */ | |
3304 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3305 | { | |
3306 | mutex_lock(&module_mutex); | |
3307 | return seq_list_start(&modules, *pos); | |
3308 | } | |
3309 | ||
3310 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3311 | { | |
3312 | return seq_list_next(p, &modules, pos); | |
3313 | } | |
3314 | ||
3315 | static void m_stop(struct seq_file *m, void *p) | |
3316 | { | |
3317 | mutex_unlock(&module_mutex); | |
3318 | } | |
3319 | ||
1da177e4 LT |
3320 | static int m_show(struct seq_file *m, void *p) |
3321 | { | |
3322 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3323 | char buf[8]; |
3324 | ||
2f0f2a33 | 3325 | seq_printf(m, "%s %u", |
1da177e4 LT |
3326 | mod->name, mod->init_size + mod->core_size); |
3327 | print_unload_info(m, mod); | |
3328 | ||
3329 | /* Informative for users. */ | |
3330 | seq_printf(m, " %s", | |
3331 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
3332 | mod->state == MODULE_STATE_COMING ? "Loading": | |
3333 | "Live"); | |
3334 | /* Used by oprofile and other similar tools. */ | |
9f36e2c4 | 3335 | seq_printf(m, " 0x%pK", mod->module_core); |
1da177e4 | 3336 | |
fa3ba2e8 FM |
3337 | /* Taints info */ |
3338 | if (mod->taints) | |
21aa9280 | 3339 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3340 | |
1da177e4 LT |
3341 | seq_printf(m, "\n"); |
3342 | return 0; | |
3343 | } | |
3344 | ||
3345 | /* Format: modulename size refcount deps address | |
3346 | ||
3347 | Where refcount is a number or -, and deps is a comma-separated list | |
3348 | of depends or -. | |
3349 | */ | |
3b5d5c6b | 3350 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3351 | .start = m_start, |
3352 | .next = m_next, | |
3353 | .stop = m_stop, | |
3354 | .show = m_show | |
3355 | }; | |
3356 | ||
3b5d5c6b AD |
3357 | static int modules_open(struct inode *inode, struct file *file) |
3358 | { | |
3359 | return seq_open(file, &modules_op); | |
3360 | } | |
3361 | ||
3362 | static const struct file_operations proc_modules_operations = { | |
3363 | .open = modules_open, | |
3364 | .read = seq_read, | |
3365 | .llseek = seq_lseek, | |
3366 | .release = seq_release, | |
3367 | }; | |
3368 | ||
3369 | static int __init proc_modules_init(void) | |
3370 | { | |
3371 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3372 | return 0; | |
3373 | } | |
3374 | module_init(proc_modules_init); | |
3375 | #endif | |
3376 | ||
1da177e4 LT |
3377 | /* Given an address, look for it in the module exception tables. */ |
3378 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3379 | { | |
1da177e4 LT |
3380 | const struct exception_table_entry *e = NULL; |
3381 | struct module *mod; | |
3382 | ||
24da1cbf | 3383 | preempt_disable(); |
d72b3751 | 3384 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
3385 | if (mod->num_exentries == 0) |
3386 | continue; | |
22a8bdeb | 3387 | |
1da177e4 LT |
3388 | e = search_extable(mod->extable, |
3389 | mod->extable + mod->num_exentries - 1, | |
3390 | addr); | |
3391 | if (e) | |
3392 | break; | |
3393 | } | |
24da1cbf | 3394 | preempt_enable(); |
1da177e4 LT |
3395 | |
3396 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3397 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3398 | return e; |
3399 | } | |
3400 | ||
4d435f9d | 3401 | /* |
e610499e RR |
3402 | * is_module_address - is this address inside a module? |
3403 | * @addr: the address to check. | |
3404 | * | |
3405 | * See is_module_text_address() if you simply want to see if the address | |
3406 | * is code (not data). | |
4d435f9d | 3407 | */ |
e610499e | 3408 | bool is_module_address(unsigned long addr) |
4d435f9d | 3409 | { |
e610499e | 3410 | bool ret; |
4d435f9d | 3411 | |
24da1cbf | 3412 | preempt_disable(); |
e610499e | 3413 | ret = __module_address(addr) != NULL; |
24da1cbf | 3414 | preempt_enable(); |
4d435f9d | 3415 | |
e610499e | 3416 | return ret; |
4d435f9d IM |
3417 | } |
3418 | ||
e610499e RR |
3419 | /* |
3420 | * __module_address - get the module which contains an address. | |
3421 | * @addr: the address. | |
3422 | * | |
3423 | * Must be called with preempt disabled or module mutex held so that | |
3424 | * module doesn't get freed during this. | |
3425 | */ | |
714f83d5 | 3426 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3427 | { |
3428 | struct module *mod; | |
3429 | ||
3a642e99 RR |
3430 | if (addr < module_addr_min || addr > module_addr_max) |
3431 | return NULL; | |
3432 | ||
d72b3751 | 3433 | list_for_each_entry_rcu(mod, &modules, list) |
e610499e RR |
3434 | if (within_module_core(addr, mod) |
3435 | || within_module_init(addr, mod)) | |
1da177e4 LT |
3436 | return mod; |
3437 | return NULL; | |
3438 | } | |
c6b37801 | 3439 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3440 | |
e610499e RR |
3441 | /* |
3442 | * is_module_text_address - is this address inside module code? | |
3443 | * @addr: the address to check. | |
3444 | * | |
3445 | * See is_module_address() if you simply want to see if the address is | |
3446 | * anywhere in a module. See kernel_text_address() for testing if an | |
3447 | * address corresponds to kernel or module code. | |
3448 | */ | |
3449 | bool is_module_text_address(unsigned long addr) | |
3450 | { | |
3451 | bool ret; | |
3452 | ||
3453 | preempt_disable(); | |
3454 | ret = __module_text_address(addr) != NULL; | |
3455 | preempt_enable(); | |
3456 | ||
3457 | return ret; | |
3458 | } | |
3459 | ||
3460 | /* | |
3461 | * __module_text_address - get the module whose code contains an address. | |
3462 | * @addr: the address. | |
3463 | * | |
3464 | * Must be called with preempt disabled or module mutex held so that | |
3465 | * module doesn't get freed during this. | |
3466 | */ | |
3467 | struct module *__module_text_address(unsigned long addr) | |
3468 | { | |
3469 | struct module *mod = __module_address(addr); | |
3470 | if (mod) { | |
3471 | /* Make sure it's within the text section. */ | |
3472 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3473 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3474 | mod = NULL; | |
3475 | } | |
3476 | return mod; | |
3477 | } | |
c6b37801 | 3478 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3479 | |
1da177e4 LT |
3480 | /* Don't grab lock, we're oopsing. */ |
3481 | void print_modules(void) | |
3482 | { | |
3483 | struct module *mod; | |
2bc2d61a | 3484 | char buf[8]; |
1da177e4 | 3485 | |
b231125a | 3486 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3487 | /* Most callers should already have preempt disabled, but make sure */ |
3488 | preempt_disable(); | |
3489 | list_for_each_entry_rcu(mod, &modules, list) | |
21aa9280 | 3490 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b3751 | 3491 | preempt_enable(); |
e14af7ee AV |
3492 | if (last_unloaded_module[0]) |
3493 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3494 | printk("\n"); |
3495 | } | |
3496 | ||
1da177e4 | 3497 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3498 | /* Generate the signature for all relevant module structures here. |
3499 | * If these change, we don't want to try to parse the module. */ | |
3500 | void module_layout(struct module *mod, | |
3501 | struct modversion_info *ver, | |
3502 | struct kernel_param *kp, | |
3503 | struct kernel_symbol *ks, | |
65498646 | 3504 | struct tracepoint * const *tp) |
8c8ef42a RR |
3505 | { |
3506 | } | |
3507 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3508 | #endif |