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1 | /* |
2 | Copyright (C) 2002 Richard Henderson |
3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
4 | |
5 | This program is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
9 | |
10 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
19 | #include <linux/export.h> |
20 | #include <linux/moduleloader.h> |
21 | #include <linux/ftrace_event.h> |
22 | #include <linux/init.h> |
23 | #include <linux/kallsyms.h> |
24 | #include <linux/file.h> |
25 | #include <linux/fs.h> |
26 | #include <linux/sysfs.h> |
27 | #include <linux/kernel.h> |
28 | #include <linux/slab.h> |
29 | #include <linux/vmalloc.h> |
30 | #include <linux/elf.h> |
31 | #include <linux/proc_fs.h> |
32 | #include <linux/security.h> |
33 | #include <linux/seq_file.h> |
34 | #include <linux/syscalls.h> |
35 | #include <linux/fcntl.h> |
36 | #include <linux/rcupdate.h> |
37 | #include <linux/capability.h> |
38 | #include <linux/cpu.h> |
39 | #include <linux/moduleparam.h> |
40 | #include <linux/errno.h> |
41 | #include <linux/err.h> |
42 | #include <linux/vermagic.h> |
43 | #include <linux/notifier.h> |
44 | #include <linux/sched.h> |
45 | #include <linux/stop_machine.h> |
46 | #include <linux/device.h> |
47 | #include <linux/string.h> |
48 | #include <linux/mutex.h> |
49 | #include <linux/rculist.h> |
50 | #include <asm/uaccess.h> |
51 | #include <asm/cacheflush.h> |
52 | #include <asm/mmu_context.h> |
53 | #include <linux/license.h> |
54 | #include <asm/sections.h> |
55 | #include <linux/tracepoint.h> |
56 | #include <linux/ftrace.h> |
57 | #include <linux/async.h> |
58 | #include <linux/percpu.h> |
59 | #include <linux/kmemleak.h> |
60 | #include <linux/jump_label.h> |
61 | #include <linux/pfn.h> |
62 | #include <linux/bsearch.h> |
63 | #include <linux/fips.h> |
64 | #include <uapi/linux/module.h> |
65 | #include "module-internal.h" |
66 | |
67 | #define CREATE_TRACE_POINTS |
68 | #include <trace/events/module.h> |
69 | |
70 | #ifndef ARCH_SHF_SMALL |
71 | #define ARCH_SHF_SMALL 0 |
72 | #endif |
73 | |
74 | /* |
75 | * Modules' sections will be aligned on page boundaries |
76 | * to ensure complete separation of code and data, but |
77 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y |
78 | */ |
79 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
80 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
81 | #else |
82 | # define debug_align(X) (X) |
83 | #endif |
84 | |
85 | /* |
86 | * Given BASE and SIZE this macro calculates the number of pages the |
87 | * memory regions occupies |
88 | */ |
89 | #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \ |
90 | (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \ |
91 | PFN_DOWN((unsigned long)BASE) + 1) \ |
92 | : (0UL)) |
93 | |
94 | /* If this is set, the section belongs in the init part of the module */ |
95 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
96 | |
97 | /* |
98 | * Mutex protects: |
99 | * 1) List of modules (also safely readable with preempt_disable), |
100 | * 2) module_use links, |
101 | * 3) module_addr_min/module_addr_max. |
102 | * (delete uses stop_machine/add uses RCU list operations). */ |
103 | DEFINE_MUTEX(module_mutex); |
104 | EXPORT_SYMBOL_GPL(module_mutex); |
105 | static LIST_HEAD(modules); |
106 | #ifdef CONFIG_KGDB_KDB |
107 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ |
108 | #endif /* CONFIG_KGDB_KDB */ |
109 | |
110 | #ifdef CONFIG_MODULE_SIG |
111 | #ifdef CONFIG_MODULE_SIG_FORCE |
112 | static bool sig_enforce = true; |
113 | #else |
114 | static bool sig_enforce = false; |
115 | |
116 | static int param_set_bool_enable_only(const char *val, |
117 | const struct kernel_param *kp) |
118 | { |
119 | int err; |
120 | bool test; |
121 | struct kernel_param dummy_kp = *kp; |
122 | |
123 | dummy_kp.arg = &test; |
124 | |
125 | err = param_set_bool(val, &dummy_kp); |
126 | if (err) |
127 | return err; |
128 | |
129 | /* Don't let them unset it once it's set! */ |
130 | if (!test && sig_enforce) |
131 | return -EROFS; |
132 | |
133 | if (test) |
134 | sig_enforce = true; |
135 | return 0; |
136 | } |
137 | |
138 | static const struct kernel_param_ops param_ops_bool_enable_only = { |
139 | .set = param_set_bool_enable_only, |
140 | .get = param_get_bool, |
141 | }; |
142 | #define param_check_bool_enable_only param_check_bool |
143 | |
144 | module_param(sig_enforce, bool_enable_only, 0644); |
145 | #endif /* !CONFIG_MODULE_SIG_FORCE */ |
146 | #endif /* CONFIG_MODULE_SIG */ |
147 | |
148 | /* Block module loading/unloading? */ |
149 | int modules_disabled = 0; |
150 | core_param(nomodule, modules_disabled, bint, 0); |
151 | |
152 | /* Waiting for a module to finish initializing? */ |
153 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
154 | |
155 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
156 | |
157 | /* Bounds of module allocation, for speeding __module_address. |
158 | * Protected by module_mutex. */ |
159 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
160 | |
161 | int register_module_notifier(struct notifier_block * nb) |
162 | { |
163 | return blocking_notifier_chain_register(&module_notify_list, nb); |
164 | } |
165 | EXPORT_SYMBOL(register_module_notifier); |
166 | |
167 | int unregister_module_notifier(struct notifier_block * nb) |
168 | { |
169 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
170 | } |
171 | EXPORT_SYMBOL(unregister_module_notifier); |
172 | |
173 | struct load_info { |
174 | Elf_Ehdr *hdr; |
175 | unsigned long len; |
176 | Elf_Shdr *sechdrs; |
177 | char *secstrings, *strtab; |
178 | unsigned long symoffs, stroffs; |
179 | struct _ddebug *debug; |
180 | unsigned int num_debug; |
181 | bool sig_ok; |
182 | struct { |
183 | unsigned int sym, str, mod, vers, info, pcpu; |
184 | } index; |
185 | }; |
186 | |
187 | /* We require a truly strong try_module_get(): 0 means failure due to |
188 | ongoing or failed initialization etc. */ |
189 | static inline int strong_try_module_get(struct module *mod) |
190 | { |
191 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
192 | if (mod && mod->state == MODULE_STATE_COMING) |
193 | return -EBUSY; |
194 | if (try_module_get(mod)) |
195 | return 0; |
196 | else |
197 | return -ENOENT; |
198 | } |
199 | |
200 | static inline void add_taint_module(struct module *mod, unsigned flag, |
201 | enum lockdep_ok lockdep_ok) |
202 | { |
203 | add_taint(flag, lockdep_ok); |
204 | mod->taints |= (1U << flag); |
205 | } |
206 | |
207 | /* |
208 | * A thread that wants to hold a reference to a module only while it |
209 | * is running can call this to safely exit. nfsd and lockd use this. |
210 | */ |
211 | void __module_put_and_exit(struct module *mod, long code) |
212 | { |
213 | module_put(mod); |
214 | do_exit(code); |
215 | } |
216 | EXPORT_SYMBOL(__module_put_and_exit); |
217 | |
218 | /* Find a module section: 0 means not found. */ |
219 | static unsigned int find_sec(const struct load_info *info, const char *name) |
220 | { |
221 | unsigned int i; |
222 | |
223 | for (i = 1; i < info->hdr->e_shnum; i++) { |
224 | Elf_Shdr *shdr = &info->sechdrs[i]; |
225 | /* Alloc bit cleared means "ignore it." */ |
226 | if ((shdr->sh_flags & SHF_ALLOC) |
227 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) |
228 | return i; |
229 | } |
230 | return 0; |
231 | } |
232 | |
233 | /* Find a module section, or NULL. */ |
234 | static void *section_addr(const struct load_info *info, const char *name) |
235 | { |
236 | /* Section 0 has sh_addr 0. */ |
237 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
238 | } |
239 | |
240 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ |
241 | static void *section_objs(const struct load_info *info, |
242 | const char *name, |
243 | size_t object_size, |
244 | unsigned int *num) |
245 | { |
246 | unsigned int sec = find_sec(info, name); |
247 | |
248 | /* Section 0 has sh_addr 0 and sh_size 0. */ |
249 | *num = info->sechdrs[sec].sh_size / object_size; |
250 | return (void *)info->sechdrs[sec].sh_addr; |
251 | } |
252 | |
253 | /* Provided by the linker */ |
254 | extern const struct kernel_symbol __start___ksymtab[]; |
255 | extern const struct kernel_symbol __stop___ksymtab[]; |
256 | extern const struct kernel_symbol __start___ksymtab_gpl[]; |
257 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
258 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
259 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
260 | extern const unsigned long __start___kcrctab[]; |
261 | extern const unsigned long __start___kcrctab_gpl[]; |
262 | extern const unsigned long __start___kcrctab_gpl_future[]; |
263 | #ifdef CONFIG_UNUSED_SYMBOLS |
264 | extern const struct kernel_symbol __start___ksymtab_unused[]; |
265 | extern const struct kernel_symbol __stop___ksymtab_unused[]; |
266 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; |
267 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; |
268 | extern const unsigned long __start___kcrctab_unused[]; |
269 | extern const unsigned long __start___kcrctab_unused_gpl[]; |
270 | #endif |
271 | |
272 | #ifndef CONFIG_MODVERSIONS |
273 | #define symversion(base, idx) NULL |
274 | #else |
275 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
276 | #endif |
277 | |
278 | static bool each_symbol_in_section(const struct symsearch *arr, |
279 | unsigned int arrsize, |
280 | struct module *owner, |
281 | bool (*fn)(const struct symsearch *syms, |
282 | struct module *owner, |
283 | void *data), |
284 | void *data) |
285 | { |
286 | unsigned int j; |
287 | |
288 | for (j = 0; j < arrsize; j++) { |
289 | if (fn(&arr[j], owner, data)) |
290 | return true; |
291 | } |
292 | |
293 | return false; |
294 | } |
295 | |
296 | /* Returns true as soon as fn returns true, otherwise false. */ |
297 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
298 | struct module *owner, |
299 | void *data), |
300 | void *data) |
301 | { |
302 | struct module *mod; |
303 | static const struct symsearch arr[] = { |
304 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
305 | NOT_GPL_ONLY, false }, |
306 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
307 | __start___kcrctab_gpl, |
308 | GPL_ONLY, false }, |
309 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
310 | __start___kcrctab_gpl_future, |
311 | WILL_BE_GPL_ONLY, false }, |
312 | #ifdef CONFIG_UNUSED_SYMBOLS |
313 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
314 | __start___kcrctab_unused, |
315 | NOT_GPL_ONLY, true }, |
316 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
317 | __start___kcrctab_unused_gpl, |
318 | GPL_ONLY, true }, |
319 | #endif |
320 | }; |
321 | |
322 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
323 | return true; |
324 | |
325 | list_for_each_entry_rcu(mod, &modules, list) { |
326 | struct symsearch arr[] = { |
327 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, |
328 | NOT_GPL_ONLY, false }, |
329 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
330 | mod->gpl_crcs, |
331 | GPL_ONLY, false }, |
332 | { mod->gpl_future_syms, |
333 | mod->gpl_future_syms + mod->num_gpl_future_syms, |
334 | mod->gpl_future_crcs, |
335 | WILL_BE_GPL_ONLY, false }, |
336 | #ifdef CONFIG_UNUSED_SYMBOLS |
337 | { mod->unused_syms, |
338 | mod->unused_syms + mod->num_unused_syms, |
339 | mod->unused_crcs, |
340 | NOT_GPL_ONLY, true }, |
341 | { mod->unused_gpl_syms, |
342 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, |
343 | mod->unused_gpl_crcs, |
344 | GPL_ONLY, true }, |
345 | #endif |
346 | }; |
347 | |
348 | if (mod->state == MODULE_STATE_UNFORMED) |
349 | continue; |
350 | |
351 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
352 | return true; |
353 | } |
354 | return false; |
355 | } |
356 | EXPORT_SYMBOL_GPL(each_symbol_section); |
357 | |
358 | struct find_symbol_arg { |
359 | /* Input */ |
360 | const char *name; |
361 | bool gplok; |
362 | bool warn; |
363 | |
364 | /* Output */ |
365 | struct module *owner; |
366 | const unsigned long *crc; |
367 | const struct kernel_symbol *sym; |
368 | }; |
369 | |
370 | static bool check_symbol(const struct symsearch *syms, |
371 | struct module *owner, |
372 | unsigned int symnum, void *data) |
373 | { |
374 | struct find_symbol_arg *fsa = data; |
375 | |
376 | if (!fsa->gplok) { |
377 | if (syms->licence == GPL_ONLY) |
378 | return false; |
379 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { |
380 | printk(KERN_WARNING "Symbol %s is being used " |
381 | "by a non-GPL module, which will not " |
382 | "be allowed in the future\n", fsa->name); |
383 | } |
384 | } |
385 | |
386 | #ifdef CONFIG_UNUSED_SYMBOLS |
387 | if (syms->unused && fsa->warn) { |
388 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " |
389 | "however this module is using it.\n", fsa->name); |
390 | printk(KERN_WARNING |
391 | "This symbol will go away in the future.\n"); |
392 | printk(KERN_WARNING |
393 | "Please evalute if this is the right api to use and if " |
394 | "it really is, submit a report the linux kernel " |
395 | "mailinglist together with submitting your code for " |
396 | "inclusion.\n"); |
397 | } |
398 | #endif |
399 | |
400 | fsa->owner = owner; |
401 | fsa->crc = symversion(syms->crcs, symnum); |
402 | fsa->sym = &syms->start[symnum]; |
403 | return true; |
404 | } |
405 | |
406 | static int cmp_name(const void *va, const void *vb) |
407 | { |
408 | const char *a; |
409 | const struct kernel_symbol *b; |
410 | a = va; b = vb; |
411 | return strcmp(a, b->name); |
412 | } |
413 | |
414 | static bool find_symbol_in_section(const struct symsearch *syms, |
415 | struct module *owner, |
416 | void *data) |
417 | { |
418 | struct find_symbol_arg *fsa = data; |
419 | struct kernel_symbol *sym; |
420 | |
421 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, |
422 | sizeof(struct kernel_symbol), cmp_name); |
423 | |
424 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) |
425 | return true; |
426 | |
427 | return false; |
428 | } |
429 | |
430 | /* Find a symbol and return it, along with, (optional) crc and |
431 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
432 | const struct kernel_symbol *find_symbol(const char *name, |
433 | struct module **owner, |
434 | const unsigned long **crc, |
435 | bool gplok, |
436 | bool warn) |
437 | { |
438 | struct find_symbol_arg fsa; |
439 | |
440 | fsa.name = name; |
441 | fsa.gplok = gplok; |
442 | fsa.warn = warn; |
443 | |
444 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
445 | if (owner) |
446 | *owner = fsa.owner; |
447 | if (crc) |
448 | *crc = fsa.crc; |
449 | return fsa.sym; |
450 | } |
451 | |
452 | pr_debug("Failed to find symbol %s\n", name); |
453 | return NULL; |
454 | } |
455 | EXPORT_SYMBOL_GPL(find_symbol); |
456 | |
457 | /* Search for module by name: must hold module_mutex. */ |
458 | static struct module *find_module_all(const char *name, size_t len, |
459 | bool even_unformed) |
460 | { |
461 | struct module *mod; |
462 | |
463 | list_for_each_entry(mod, &modules, list) { |
464 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
465 | continue; |
466 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
467 | return mod; |
468 | } |
469 | return NULL; |
470 | } |
471 | |
472 | struct module *find_module(const char *name) |
473 | { |
474 | return find_module_all(name, strlen(name), false); |
475 | } |
476 | EXPORT_SYMBOL_GPL(find_module); |
477 | |
478 | #ifdef CONFIG_SMP |
479 | |
480 | static inline void __percpu *mod_percpu(struct module *mod) |
481 | { |
482 | return mod->percpu; |
483 | } |
484 | |
485 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
486 | { |
487 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
488 | unsigned long align = pcpusec->sh_addralign; |
489 | |
490 | if (!pcpusec->sh_size) |
491 | return 0; |
492 | |
493 | if (align > PAGE_SIZE) { |
494 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", |
495 | mod->name, align, PAGE_SIZE); |
496 | align = PAGE_SIZE; |
497 | } |
498 | |
499 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
500 | if (!mod->percpu) { |
501 | printk(KERN_WARNING |
502 | "%s: Could not allocate %lu bytes percpu data\n", |
503 | mod->name, (unsigned long)pcpusec->sh_size); |
504 | return -ENOMEM; |
505 | } |
506 | mod->percpu_size = pcpusec->sh_size; |
507 | return 0; |
508 | } |
509 | |
510 | static void percpu_modfree(struct module *mod) |
511 | { |
512 | free_percpu(mod->percpu); |
513 | } |
514 | |
515 | static unsigned int find_pcpusec(struct load_info *info) |
516 | { |
517 | return find_sec(info, ".data..percpu"); |
518 | } |
519 | |
520 | static void percpu_modcopy(struct module *mod, |
521 | const void *from, unsigned long size) |
522 | { |
523 | int cpu; |
524 | |
525 | for_each_possible_cpu(cpu) |
526 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
527 | } |
528 | |
529 | /** |
530 | * is_module_percpu_address - test whether address is from module static percpu |
531 | * @addr: address to test |
532 | * |
533 | * Test whether @addr belongs to module static percpu area. |
534 | * |
535 | * RETURNS: |
536 | * %true if @addr is from module static percpu area |
537 | */ |
538 | bool is_module_percpu_address(unsigned long addr) |
539 | { |
540 | struct module *mod; |
541 | unsigned int cpu; |
542 | |
543 | preempt_disable(); |
544 | |
545 | list_for_each_entry_rcu(mod, &modules, list) { |
546 | if (mod->state == MODULE_STATE_UNFORMED) |
547 | continue; |
548 | if (!mod->percpu_size) |
549 | continue; |
550 | for_each_possible_cpu(cpu) { |
551 | void *start = per_cpu_ptr(mod->percpu, cpu); |
552 | |
553 | if ((void *)addr >= start && |
554 | (void *)addr < start + mod->percpu_size) { |
555 | preempt_enable(); |
556 | return true; |
557 | } |
558 | } |
559 | } |
560 | |
561 | preempt_enable(); |
562 | return false; |
563 | } |
564 | |
565 | #else /* ... !CONFIG_SMP */ |
566 | |
567 | static inline void __percpu *mod_percpu(struct module *mod) |
568 | { |
569 | return NULL; |
570 | } |
571 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
572 | { |
573 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
574 | if (info->sechdrs[info->index.pcpu].sh_size != 0) |
575 | return -ENOMEM; |
576 | return 0; |
577 | } |
578 | static inline void percpu_modfree(struct module *mod) |
579 | { |
580 | } |
581 | static unsigned int find_pcpusec(struct load_info *info) |
582 | { |
583 | return 0; |
584 | } |
585 | static inline void percpu_modcopy(struct module *mod, |
586 | const void *from, unsigned long size) |
587 | { |
588 | /* pcpusec should be 0, and size of that section should be 0. */ |
589 | BUG_ON(size != 0); |
590 | } |
591 | bool is_module_percpu_address(unsigned long addr) |
592 | { |
593 | return false; |
594 | } |
595 | |
596 | #endif /* CONFIG_SMP */ |
597 | |
598 | #define MODINFO_ATTR(field) \ |
599 | static void setup_modinfo_##field(struct module *mod, const char *s) \ |
600 | { \ |
601 | mod->field = kstrdup(s, GFP_KERNEL); \ |
602 | } \ |
603 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ |
604 | struct module_kobject *mk, char *buffer) \ |
605 | { \ |
606 | return sprintf(buffer, "%s\n", mk->mod->field); \ |
607 | } \ |
608 | static int modinfo_##field##_exists(struct module *mod) \ |
609 | { \ |
610 | return mod->field != NULL; \ |
611 | } \ |
612 | static void free_modinfo_##field(struct module *mod) \ |
613 | { \ |
614 | kfree(mod->field); \ |
615 | mod->field = NULL; \ |
616 | } \ |
617 | static struct module_attribute modinfo_##field = { \ |
618 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
619 | .show = show_modinfo_##field, \ |
620 | .setup = setup_modinfo_##field, \ |
621 | .test = modinfo_##field##_exists, \ |
622 | .free = free_modinfo_##field, \ |
623 | }; |
624 | |
625 | MODINFO_ATTR(version); |
626 | MODINFO_ATTR(srcversion); |
627 | |
628 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
629 | |
630 | #ifdef CONFIG_MODULE_UNLOAD |
631 | |
632 | EXPORT_TRACEPOINT_SYMBOL(module_get); |
633 | |
634 | /* Init the unload section of the module. */ |
635 | static int module_unload_init(struct module *mod) |
636 | { |
637 | mod->refptr = alloc_percpu(struct module_ref); |
638 | if (!mod->refptr) |
639 | return -ENOMEM; |
640 | |
641 | INIT_LIST_HEAD(&mod->source_list); |
642 | INIT_LIST_HEAD(&mod->target_list); |
643 | |
644 | /* Hold reference count during initialization. */ |
645 | __this_cpu_write(mod->refptr->incs, 1); |
646 | /* Backwards compatibility macros put refcount during init. */ |
647 | mod->waiter = current; |
648 | |
649 | return 0; |
650 | } |
651 | |
652 | /* Does a already use b? */ |
653 | static int already_uses(struct module *a, struct module *b) |
654 | { |
655 | struct module_use *use; |
656 | |
657 | list_for_each_entry(use, &b->source_list, source_list) { |
658 | if (use->source == a) { |
659 | pr_debug("%s uses %s!\n", a->name, b->name); |
660 | return 1; |
661 | } |
662 | } |
663 | pr_debug("%s does not use %s!\n", a->name, b->name); |
664 | return 0; |
665 | } |
666 | |
667 | /* |
668 | * Module a uses b |
669 | * - we add 'a' as a "source", 'b' as a "target" of module use |
670 | * - the module_use is added to the list of 'b' sources (so |
671 | * 'b' can walk the list to see who sourced them), and of 'a' |
672 | * targets (so 'a' can see what modules it targets). |
673 | */ |
674 | static int add_module_usage(struct module *a, struct module *b) |
675 | { |
676 | struct module_use *use; |
677 | |
678 | pr_debug("Allocating new usage for %s.\n", a->name); |
679 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
680 | if (!use) { |
681 | printk(KERN_WARNING "%s: out of memory loading\n", a->name); |
682 | return -ENOMEM; |
683 | } |
684 | |
685 | use->source = a; |
686 | use->target = b; |
687 | list_add(&use->source_list, &b->source_list); |
688 | list_add(&use->target_list, &a->target_list); |
689 | return 0; |
690 | } |
691 | |
692 | /* Module a uses b: caller needs module_mutex() */ |
693 | int ref_module(struct module *a, struct module *b) |
694 | { |
695 | int err; |
696 | |
697 | if (b == NULL || already_uses(a, b)) |
698 | return 0; |
699 | |
700 | /* If module isn't available, we fail. */ |
701 | err = strong_try_module_get(b); |
702 | if (err) |
703 | return err; |
704 | |
705 | err = add_module_usage(a, b); |
706 | if (err) { |
707 | module_put(b); |
708 | return err; |
709 | } |
710 | return 0; |
711 | } |
712 | EXPORT_SYMBOL_GPL(ref_module); |
713 | |
714 | /* Clear the unload stuff of the module. */ |
715 | static void module_unload_free(struct module *mod) |
716 | { |
717 | struct module_use *use, *tmp; |
718 | |
719 | mutex_lock(&module_mutex); |
720 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
721 | struct module *i = use->target; |
722 | pr_debug("%s unusing %s\n", mod->name, i->name); |
723 | module_put(i); |
724 | list_del(&use->source_list); |
725 | list_del(&use->target_list); |
726 | kfree(use); |
727 | } |
728 | mutex_unlock(&module_mutex); |
729 | |
730 | free_percpu(mod->refptr); |
731 | } |
732 | |
733 | #ifdef CONFIG_MODULE_FORCE_UNLOAD |
734 | static inline int try_force_unload(unsigned int flags) |
735 | { |
736 | int ret = (flags & O_TRUNC); |
737 | if (ret) |
738 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
739 | return ret; |
740 | } |
741 | #else |
742 | static inline int try_force_unload(unsigned int flags) |
743 | { |
744 | return 0; |
745 | } |
746 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ |
747 | |
748 | struct stopref |
749 | { |
750 | struct module *mod; |
751 | int flags; |
752 | int *forced; |
753 | }; |
754 | |
755 | /* Whole machine is stopped with interrupts off when this runs. */ |
756 | static int __try_stop_module(void *_sref) |
757 | { |
758 | struct stopref *sref = _sref; |
759 | |
760 | /* If it's not unused, quit unless we're forcing. */ |
761 | if (module_refcount(sref->mod) != 0) { |
762 | if (!(*sref->forced = try_force_unload(sref->flags))) |
763 | return -EWOULDBLOCK; |
764 | } |
765 | |
766 | /* Mark it as dying. */ |
767 | sref->mod->state = MODULE_STATE_GOING; |
768 | return 0; |
769 | } |
770 | |
771 | static int try_stop_module(struct module *mod, int flags, int *forced) |
772 | { |
773 | if (flags & O_NONBLOCK) { |
774 | struct stopref sref = { mod, flags, forced }; |
775 | |
776 | return stop_machine(__try_stop_module, &sref, NULL); |
777 | } else { |
778 | /* We don't need to stop the machine for this. */ |
779 | mod->state = MODULE_STATE_GOING; |
780 | synchronize_sched(); |
781 | return 0; |
782 | } |
783 | } |
784 | |
785 | unsigned long module_refcount(struct module *mod) |
786 | { |
787 | unsigned long incs = 0, decs = 0; |
788 | int cpu; |
789 | |
790 | for_each_possible_cpu(cpu) |
791 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
792 | /* |
793 | * ensure the incs are added up after the decs. |
794 | * module_put ensures incs are visible before decs with smp_wmb. |
795 | * |
796 | * This 2-count scheme avoids the situation where the refcount |
797 | * for CPU0 is read, then CPU0 increments the module refcount, |
798 | * then CPU1 drops that refcount, then the refcount for CPU1 is |
799 | * read. We would record a decrement but not its corresponding |
800 | * increment so we would see a low count (disaster). |
801 | * |
802 | * Rare situation? But module_refcount can be preempted, and we |
803 | * might be tallying up 4096+ CPUs. So it is not impossible. |
804 | */ |
805 | smp_rmb(); |
806 | for_each_possible_cpu(cpu) |
807 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; |
808 | return incs - decs; |
809 | } |
810 | EXPORT_SYMBOL(module_refcount); |
811 | |
812 | /* This exists whether we can unload or not */ |
813 | static void free_module(struct module *mod); |
814 | |
815 | static void wait_for_zero_refcount(struct module *mod) |
816 | { |
817 | /* Since we might sleep for some time, release the mutex first */ |
818 | mutex_unlock(&module_mutex); |
819 | for (;;) { |
820 | pr_debug("Looking at refcount...\n"); |
821 | set_current_state(TASK_UNINTERRUPTIBLE); |
822 | if (module_refcount(mod) == 0) |
823 | break; |
824 | schedule(); |
825 | } |
826 | current->state = TASK_RUNNING; |
827 | mutex_lock(&module_mutex); |
828 | } |
829 | |
830 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
831 | unsigned int, flags) |
832 | { |
833 | struct module *mod; |
834 | char name[MODULE_NAME_LEN]; |
835 | int ret, forced = 0; |
836 | |
837 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
838 | return -EPERM; |
839 | |
840 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) |
841 | return -EFAULT; |
842 | name[MODULE_NAME_LEN-1] = '\0'; |
843 | |
844 | if (mutex_lock_interruptible(&module_mutex) != 0) |
845 | return -EINTR; |
846 | |
847 | mod = find_module(name); |
848 | if (!mod) { |
849 | ret = -ENOENT; |
850 | goto out; |
851 | } |
852 | |
853 | if (!list_empty(&mod->source_list)) { |
854 | /* Other modules depend on us: get rid of them first. */ |
855 | ret = -EWOULDBLOCK; |
856 | goto out; |
857 | } |
858 | |
859 | /* Doing init or already dying? */ |
860 | if (mod->state != MODULE_STATE_LIVE) { |
861 | /* FIXME: if (force), slam module count and wake up |
862 | waiter --RR */ |
863 | pr_debug("%s already dying\n", mod->name); |
864 | ret = -EBUSY; |
865 | goto out; |
866 | } |
867 | |
868 | /* If it has an init func, it must have an exit func to unload */ |
869 | if (mod->init && !mod->exit) { |
870 | forced = try_force_unload(flags); |
871 | if (!forced) { |
872 | /* This module can't be removed */ |
873 | ret = -EBUSY; |
874 | goto out; |
875 | } |
876 | } |
877 | |
878 | /* Set this up before setting mod->state */ |
879 | mod->waiter = current; |
880 | |
881 | /* Stop the machine so refcounts can't move and disable module. */ |
882 | ret = try_stop_module(mod, flags, &forced); |
883 | if (ret != 0) |
884 | goto out; |
885 | |
886 | /* Never wait if forced. */ |
887 | if (!forced && module_refcount(mod) != 0) |
888 | wait_for_zero_refcount(mod); |
889 | |
890 | mutex_unlock(&module_mutex); |
891 | /* Final destruction now no one is using it. */ |
892 | if (mod->exit != NULL) |
893 | mod->exit(); |
894 | blocking_notifier_call_chain(&module_notify_list, |
895 | MODULE_STATE_GOING, mod); |
896 | async_synchronize_full(); |
897 | |
898 | /* Store the name of the last unloaded module for diagnostic purposes */ |
899 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
900 | |
901 | free_module(mod); |
902 | return 0; |
903 | out: |
904 | mutex_unlock(&module_mutex); |
905 | return ret; |
906 | } |
907 | |
908 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
909 | { |
910 | struct module_use *use; |
911 | int printed_something = 0; |
912 | |
913 | seq_printf(m, " %lu ", module_refcount(mod)); |
914 | |
915 | /* Always include a trailing , so userspace can differentiate |
916 | between this and the old multi-field proc format. */ |
917 | list_for_each_entry(use, &mod->source_list, source_list) { |
918 | printed_something = 1; |
919 | seq_printf(m, "%s,", use->source->name); |
920 | } |
921 | |
922 | if (mod->init != NULL && mod->exit == NULL) { |
923 | printed_something = 1; |
924 | seq_printf(m, "[permanent],"); |
925 | } |
926 | |
927 | if (!printed_something) |
928 | seq_printf(m, "-"); |
929 | } |
930 | |
931 | void __symbol_put(const char *symbol) |
932 | { |
933 | struct module *owner; |
934 | |
935 | preempt_disable(); |
936 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
937 | BUG(); |
938 | module_put(owner); |
939 | preempt_enable(); |
940 | } |
941 | EXPORT_SYMBOL(__symbol_put); |
942 | |
943 | /* Note this assumes addr is a function, which it currently always is. */ |
944 | void symbol_put_addr(void *addr) |
945 | { |
946 | struct module *modaddr; |
947 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
948 | |
949 | if (core_kernel_text(a)) |
950 | return; |
951 | |
952 | /* module_text_address is safe here: we're supposed to have reference |
953 | * to module from symbol_get, so it can't go away. */ |
954 | modaddr = __module_text_address(a); |
955 | BUG_ON(!modaddr); |
956 | module_put(modaddr); |
957 | } |
958 | EXPORT_SYMBOL_GPL(symbol_put_addr); |
959 | |
960 | static ssize_t show_refcnt(struct module_attribute *mattr, |
961 | struct module_kobject *mk, char *buffer) |
962 | { |
963 | return sprintf(buffer, "%lu\n", module_refcount(mk->mod)); |
964 | } |
965 | |
966 | static struct module_attribute modinfo_refcnt = |
967 | __ATTR(refcnt, 0444, show_refcnt, NULL); |
968 | |
969 | void __module_get(struct module *module) |
970 | { |
971 | if (module) { |
972 | preempt_disable(); |
973 | __this_cpu_inc(module->refptr->incs); |
974 | trace_module_get(module, _RET_IP_); |
975 | preempt_enable(); |
976 | } |
977 | } |
978 | EXPORT_SYMBOL(__module_get); |
979 | |
980 | bool try_module_get(struct module *module) |
981 | { |
982 | bool ret = true; |
983 | |
984 | if (module) { |
985 | preempt_disable(); |
986 | |
987 | if (likely(module_is_live(module))) { |
988 | __this_cpu_inc(module->refptr->incs); |
989 | trace_module_get(module, _RET_IP_); |
990 | } else |
991 | ret = false; |
992 | |
993 | preempt_enable(); |
994 | } |
995 | return ret; |
996 | } |
997 | EXPORT_SYMBOL(try_module_get); |
998 | |
999 | void module_put(struct module *module) |
1000 | { |
1001 | if (module) { |
1002 | preempt_disable(); |
1003 | smp_wmb(); /* see comment in module_refcount */ |
1004 | __this_cpu_inc(module->refptr->decs); |
1005 | |
1006 | trace_module_put(module, _RET_IP_); |
1007 | /* Maybe they're waiting for us to drop reference? */ |
1008 | if (unlikely(!module_is_live(module))) |
1009 | wake_up_process(module->waiter); |
1010 | preempt_enable(); |
1011 | } |
1012 | } |
1013 | EXPORT_SYMBOL(module_put); |
1014 | |
1015 | #else /* !CONFIG_MODULE_UNLOAD */ |
1016 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1017 | { |
1018 | /* We don't know the usage count, or what modules are using. */ |
1019 | seq_printf(m, " - -"); |
1020 | } |
1021 | |
1022 | static inline void module_unload_free(struct module *mod) |
1023 | { |
1024 | } |
1025 | |
1026 | int ref_module(struct module *a, struct module *b) |
1027 | { |
1028 | return strong_try_module_get(b); |
1029 | } |
1030 | EXPORT_SYMBOL_GPL(ref_module); |
1031 | |
1032 | static inline int module_unload_init(struct module *mod) |
1033 | { |
1034 | return 0; |
1035 | } |
1036 | #endif /* CONFIG_MODULE_UNLOAD */ |
1037 | |
1038 | static size_t module_flags_taint(struct module *mod, char *buf) |
1039 | { |
1040 | size_t l = 0; |
1041 | |
1042 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
1043 | buf[l++] = 'P'; |
1044 | if (mod->taints & (1 << TAINT_OOT_MODULE)) |
1045 | buf[l++] = 'O'; |
1046 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
1047 | buf[l++] = 'F'; |
1048 | if (mod->taints & (1 << TAINT_CRAP)) |
1049 | buf[l++] = 'C'; |
1050 | /* |
1051 | * TAINT_FORCED_RMMOD: could be added. |
1052 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
1053 | * apply to modules. |
1054 | */ |
1055 | return l; |
1056 | } |
1057 | |
1058 | static ssize_t show_initstate(struct module_attribute *mattr, |
1059 | struct module_kobject *mk, char *buffer) |
1060 | { |
1061 | const char *state = "unknown"; |
1062 | |
1063 | switch (mk->mod->state) { |
1064 | case MODULE_STATE_LIVE: |
1065 | state = "live"; |
1066 | break; |
1067 | case MODULE_STATE_COMING: |
1068 | state = "coming"; |
1069 | break; |
1070 | case MODULE_STATE_GOING: |
1071 | state = "going"; |
1072 | break; |
1073 | default: |
1074 | BUG(); |
1075 | } |
1076 | return sprintf(buffer, "%s\n", state); |
1077 | } |
1078 | |
1079 | static struct module_attribute modinfo_initstate = |
1080 | __ATTR(initstate, 0444, show_initstate, NULL); |
1081 | |
1082 | static ssize_t store_uevent(struct module_attribute *mattr, |
1083 | struct module_kobject *mk, |
1084 | const char *buffer, size_t count) |
1085 | { |
1086 | enum kobject_action action; |
1087 | |
1088 | if (kobject_action_type(buffer, count, &action) == 0) |
1089 | kobject_uevent(&mk->kobj, action); |
1090 | return count; |
1091 | } |
1092 | |
1093 | struct module_attribute module_uevent = |
1094 | __ATTR(uevent, 0200, NULL, store_uevent); |
1095 | |
1096 | static ssize_t show_coresize(struct module_attribute *mattr, |
1097 | struct module_kobject *mk, char *buffer) |
1098 | { |
1099 | return sprintf(buffer, "%u\n", mk->mod->core_size); |
1100 | } |
1101 | |
1102 | static struct module_attribute modinfo_coresize = |
1103 | __ATTR(coresize, 0444, show_coresize, NULL); |
1104 | |
1105 | static ssize_t show_initsize(struct module_attribute *mattr, |
1106 | struct module_kobject *mk, char *buffer) |
1107 | { |
1108 | return sprintf(buffer, "%u\n", mk->mod->init_size); |
1109 | } |
1110 | |
1111 | static struct module_attribute modinfo_initsize = |
1112 | __ATTR(initsize, 0444, show_initsize, NULL); |
1113 | |
1114 | static ssize_t show_taint(struct module_attribute *mattr, |
1115 | struct module_kobject *mk, char *buffer) |
1116 | { |
1117 | size_t l; |
1118 | |
1119 | l = module_flags_taint(mk->mod, buffer); |
1120 | buffer[l++] = '\n'; |
1121 | return l; |
1122 | } |
1123 | |
1124 | static struct module_attribute modinfo_taint = |
1125 | __ATTR(taint, 0444, show_taint, NULL); |
1126 | |
1127 | static struct module_attribute *modinfo_attrs[] = { |
1128 | &module_uevent, |
1129 | &modinfo_version, |
1130 | &modinfo_srcversion, |
1131 | &modinfo_initstate, |
1132 | &modinfo_coresize, |
1133 | &modinfo_initsize, |
1134 | &modinfo_taint, |
1135 | #ifdef CONFIG_MODULE_UNLOAD |
1136 | &modinfo_refcnt, |
1137 | #endif |
1138 | NULL, |
1139 | }; |
1140 | |
1141 | static const char vermagic[] = VERMAGIC_STRING; |
1142 | |
1143 | static int try_to_force_load(struct module *mod, const char *reason) |
1144 | { |
1145 | #ifdef CONFIG_MODULE_FORCE_LOAD |
1146 | if (!test_taint(TAINT_FORCED_MODULE)) |
1147 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
1148 | mod->name, reason); |
1149 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
1150 | return 0; |
1151 | #else |
1152 | return -ENOEXEC; |
1153 | #endif |
1154 | } |
1155 | |
1156 | #ifdef CONFIG_MODVERSIONS |
1157 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1158 | static unsigned long maybe_relocated(unsigned long crc, |
1159 | const struct module *crc_owner) |
1160 | { |
1161 | #ifdef ARCH_RELOCATES_KCRCTAB |
1162 | if (crc_owner == NULL) |
1163 | return crc - (unsigned long)reloc_start; |
1164 | #endif |
1165 | return crc; |
1166 | } |
1167 | |
1168 | static int check_version(Elf_Shdr *sechdrs, |
1169 | unsigned int versindex, |
1170 | const char *symname, |
1171 | struct module *mod, |
1172 | const unsigned long *crc, |
1173 | const struct module *crc_owner) |
1174 | { |
1175 | unsigned int i, num_versions; |
1176 | struct modversion_info *versions; |
1177 | |
1178 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ |
1179 | if (!crc) |
1180 | return 1; |
1181 | |
1182 | /* No versions at all? modprobe --force does this. */ |
1183 | if (versindex == 0) |
1184 | return try_to_force_load(mod, symname) == 0; |
1185 | |
1186 | versions = (void *) sechdrs[versindex].sh_addr; |
1187 | num_versions = sechdrs[versindex].sh_size |
1188 | / sizeof(struct modversion_info); |
1189 | |
1190 | for (i = 0; i < num_versions; i++) { |
1191 | if (strcmp(versions[i].name, symname) != 0) |
1192 | continue; |
1193 | |
1194 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1195 | return 1; |
1196 | pr_debug("Found checksum %lX vs module %lX\n", |
1197 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
1198 | goto bad_version; |
1199 | } |
1200 | |
1201 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1202 | mod->name, symname); |
1203 | return 0; |
1204 | |
1205 | bad_version: |
1206 | printk("%s: disagrees about version of symbol %s\n", |
1207 | mod->name, symname); |
1208 | return 0; |
1209 | } |
1210 | |
1211 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
1212 | unsigned int versindex, |
1213 | struct module *mod) |
1214 | { |
1215 | const unsigned long *crc; |
1216 | |
1217 | /* Since this should be found in kernel (which can't be removed), |
1218 | * no locking is necessary. */ |
1219 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
1220 | &crc, true, false)) |
1221 | BUG(); |
1222 | return check_version(sechdrs, versindex, |
1223 | VMLINUX_SYMBOL_STR(module_layout), mod, crc, |
1224 | NULL); |
1225 | } |
1226 | |
1227 | /* First part is kernel version, which we ignore if module has crcs. */ |
1228 | static inline int same_magic(const char *amagic, const char *bmagic, |
1229 | bool has_crcs) |
1230 | { |
1231 | if (has_crcs) { |
1232 | amagic += strcspn(amagic, " "); |
1233 | bmagic += strcspn(bmagic, " "); |
1234 | } |
1235 | return strcmp(amagic, bmagic) == 0; |
1236 | } |
1237 | #else |
1238 | static inline int check_version(Elf_Shdr *sechdrs, |
1239 | unsigned int versindex, |
1240 | const char *symname, |
1241 | struct module *mod, |
1242 | const unsigned long *crc, |
1243 | const struct module *crc_owner) |
1244 | { |
1245 | return 1; |
1246 | } |
1247 | |
1248 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
1249 | unsigned int versindex, |
1250 | struct module *mod) |
1251 | { |
1252 | return 1; |
1253 | } |
1254 | |
1255 | static inline int same_magic(const char *amagic, const char *bmagic, |
1256 | bool has_crcs) |
1257 | { |
1258 | return strcmp(amagic, bmagic) == 0; |
1259 | } |
1260 | #endif /* CONFIG_MODVERSIONS */ |
1261 | |
1262 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
1263 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1264 | const struct load_info *info, |
1265 | const char *name, |
1266 | char ownername[]) |
1267 | { |
1268 | struct module *owner; |
1269 | const struct kernel_symbol *sym; |
1270 | const unsigned long *crc; |
1271 | int err; |
1272 | |
1273 | mutex_lock(&module_mutex); |
1274 | sym = find_symbol(name, &owner, &crc, |
1275 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
1276 | if (!sym) |
1277 | goto unlock; |
1278 | |
1279 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1280 | owner)) { |
1281 | sym = ERR_PTR(-EINVAL); |
1282 | goto getname; |
1283 | } |
1284 | |
1285 | err = ref_module(mod, owner); |
1286 | if (err) { |
1287 | sym = ERR_PTR(err); |
1288 | goto getname; |
1289 | } |
1290 | |
1291 | getname: |
1292 | /* We must make copy under the lock if we failed to get ref. */ |
1293 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); |
1294 | unlock: |
1295 | mutex_unlock(&module_mutex); |
1296 | return sym; |
1297 | } |
1298 | |
1299 | static const struct kernel_symbol * |
1300 | resolve_symbol_wait(struct module *mod, |
1301 | const struct load_info *info, |
1302 | const char *name) |
1303 | { |
1304 | const struct kernel_symbol *ksym; |
1305 | char owner[MODULE_NAME_LEN]; |
1306 | |
1307 | if (wait_event_interruptible_timeout(module_wq, |
1308 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1309 | || PTR_ERR(ksym) != -EBUSY, |
1310 | 30 * HZ) <= 0) { |
1311 | printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n", |
1312 | mod->name, owner); |
1313 | } |
1314 | return ksym; |
1315 | } |
1316 | |
1317 | /* |
1318 | * /sys/module/foo/sections stuff |
1319 | * J. Corbet <corbet@lwn.net> |
1320 | */ |
1321 | #ifdef CONFIG_SYSFS |
1322 | |
1323 | #ifdef CONFIG_KALLSYMS |
1324 | static inline bool sect_empty(const Elf_Shdr *sect) |
1325 | { |
1326 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; |
1327 | } |
1328 | |
1329 | struct module_sect_attr |
1330 | { |
1331 | struct module_attribute mattr; |
1332 | char *name; |
1333 | unsigned long address; |
1334 | }; |
1335 | |
1336 | struct module_sect_attrs |
1337 | { |
1338 | struct attribute_group grp; |
1339 | unsigned int nsections; |
1340 | struct module_sect_attr attrs[0]; |
1341 | }; |
1342 | |
1343 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1344 | struct module_kobject *mk, char *buf) |
1345 | { |
1346 | struct module_sect_attr *sattr = |
1347 | container_of(mattr, struct module_sect_attr, mattr); |
1348 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1349 | } |
1350 | |
1351 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1352 | { |
1353 | unsigned int section; |
1354 | |
1355 | for (section = 0; section < sect_attrs->nsections; section++) |
1356 | kfree(sect_attrs->attrs[section].name); |
1357 | kfree(sect_attrs); |
1358 | } |
1359 | |
1360 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1361 | { |
1362 | unsigned int nloaded = 0, i, size[2]; |
1363 | struct module_sect_attrs *sect_attrs; |
1364 | struct module_sect_attr *sattr; |
1365 | struct attribute **gattr; |
1366 | |
1367 | /* Count loaded sections and allocate structures */ |
1368 | for (i = 0; i < info->hdr->e_shnum; i++) |
1369 | if (!sect_empty(&info->sechdrs[i])) |
1370 | nloaded++; |
1371 | size[0] = ALIGN(sizeof(*sect_attrs) |
1372 | + nloaded * sizeof(sect_attrs->attrs[0]), |
1373 | sizeof(sect_attrs->grp.attrs[0])); |
1374 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); |
1375 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1376 | if (sect_attrs == NULL) |
1377 | return; |
1378 | |
1379 | /* Setup section attributes. */ |
1380 | sect_attrs->grp.name = "sections"; |
1381 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
1382 | |
1383 | sect_attrs->nsections = 0; |
1384 | sattr = §_attrs->attrs[0]; |
1385 | gattr = §_attrs->grp.attrs[0]; |
1386 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1387 | Elf_Shdr *sec = &info->sechdrs[i]; |
1388 | if (sect_empty(sec)) |
1389 | continue; |
1390 | sattr->address = sec->sh_addr; |
1391 | sattr->name = kstrdup(info->secstrings + sec->sh_name, |
1392 | GFP_KERNEL); |
1393 | if (sattr->name == NULL) |
1394 | goto out; |
1395 | sect_attrs->nsections++; |
1396 | sysfs_attr_init(&sattr->mattr.attr); |
1397 | sattr->mattr.show = module_sect_show; |
1398 | sattr->mattr.store = NULL; |
1399 | sattr->mattr.attr.name = sattr->name; |
1400 | sattr->mattr.attr.mode = S_IRUGO; |
1401 | *(gattr++) = &(sattr++)->mattr.attr; |
1402 | } |
1403 | *gattr = NULL; |
1404 | |
1405 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) |
1406 | goto out; |
1407 | |
1408 | mod->sect_attrs = sect_attrs; |
1409 | return; |
1410 | out: |
1411 | free_sect_attrs(sect_attrs); |
1412 | } |
1413 | |
1414 | static void remove_sect_attrs(struct module *mod) |
1415 | { |
1416 | if (mod->sect_attrs) { |
1417 | sysfs_remove_group(&mod->mkobj.kobj, |
1418 | &mod->sect_attrs->grp); |
1419 | /* We are positive that no one is using any sect attrs |
1420 | * at this point. Deallocate immediately. */ |
1421 | free_sect_attrs(mod->sect_attrs); |
1422 | mod->sect_attrs = NULL; |
1423 | } |
1424 | } |
1425 | |
1426 | /* |
1427 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. |
1428 | */ |
1429 | |
1430 | struct module_notes_attrs { |
1431 | struct kobject *dir; |
1432 | unsigned int notes; |
1433 | struct bin_attribute attrs[0]; |
1434 | }; |
1435 | |
1436 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
1437 | struct bin_attribute *bin_attr, |
1438 | char *buf, loff_t pos, size_t count) |
1439 | { |
1440 | /* |
1441 | * The caller checked the pos and count against our size. |
1442 | */ |
1443 | memcpy(buf, bin_attr->private + pos, count); |
1444 | return count; |
1445 | } |
1446 | |
1447 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, |
1448 | unsigned int i) |
1449 | { |
1450 | if (notes_attrs->dir) { |
1451 | while (i-- > 0) |
1452 | sysfs_remove_bin_file(notes_attrs->dir, |
1453 | ¬es_attrs->attrs[i]); |
1454 | kobject_put(notes_attrs->dir); |
1455 | } |
1456 | kfree(notes_attrs); |
1457 | } |
1458 | |
1459 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
1460 | { |
1461 | unsigned int notes, loaded, i; |
1462 | struct module_notes_attrs *notes_attrs; |
1463 | struct bin_attribute *nattr; |
1464 | |
1465 | /* failed to create section attributes, so can't create notes */ |
1466 | if (!mod->sect_attrs) |
1467 | return; |
1468 | |
1469 | /* Count notes sections and allocate structures. */ |
1470 | notes = 0; |
1471 | for (i = 0; i < info->hdr->e_shnum; i++) |
1472 | if (!sect_empty(&info->sechdrs[i]) && |
1473 | (info->sechdrs[i].sh_type == SHT_NOTE)) |
1474 | ++notes; |
1475 | |
1476 | if (notes == 0) |
1477 | return; |
1478 | |
1479 | notes_attrs = kzalloc(sizeof(*notes_attrs) |
1480 | + notes * sizeof(notes_attrs->attrs[0]), |
1481 | GFP_KERNEL); |
1482 | if (notes_attrs == NULL) |
1483 | return; |
1484 | |
1485 | notes_attrs->notes = notes; |
1486 | nattr = ¬es_attrs->attrs[0]; |
1487 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1488 | if (sect_empty(&info->sechdrs[i])) |
1489 | continue; |
1490 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
1491 | sysfs_bin_attr_init(nattr); |
1492 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1493 | nattr->attr.mode = S_IRUGO; |
1494 | nattr->size = info->sechdrs[i].sh_size; |
1495 | nattr->private = (void *) info->sechdrs[i].sh_addr; |
1496 | nattr->read = module_notes_read; |
1497 | ++nattr; |
1498 | } |
1499 | ++loaded; |
1500 | } |
1501 | |
1502 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
1503 | if (!notes_attrs->dir) |
1504 | goto out; |
1505 | |
1506 | for (i = 0; i < notes; ++i) |
1507 | if (sysfs_create_bin_file(notes_attrs->dir, |
1508 | ¬es_attrs->attrs[i])) |
1509 | goto out; |
1510 | |
1511 | mod->notes_attrs = notes_attrs; |
1512 | return; |
1513 | |
1514 | out: |
1515 | free_notes_attrs(notes_attrs, i); |
1516 | } |
1517 | |
1518 | static void remove_notes_attrs(struct module *mod) |
1519 | { |
1520 | if (mod->notes_attrs) |
1521 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); |
1522 | } |
1523 | |
1524 | #else |
1525 | |
1526 | static inline void add_sect_attrs(struct module *mod, |
1527 | const struct load_info *info) |
1528 | { |
1529 | } |
1530 | |
1531 | static inline void remove_sect_attrs(struct module *mod) |
1532 | { |
1533 | } |
1534 | |
1535 | static inline void add_notes_attrs(struct module *mod, |
1536 | const struct load_info *info) |
1537 | { |
1538 | } |
1539 | |
1540 | static inline void remove_notes_attrs(struct module *mod) |
1541 | { |
1542 | } |
1543 | #endif /* CONFIG_KALLSYMS */ |
1544 | |
1545 | static void add_usage_links(struct module *mod) |
1546 | { |
1547 | #ifdef CONFIG_MODULE_UNLOAD |
1548 | struct module_use *use; |
1549 | int nowarn; |
1550 | |
1551 | mutex_lock(&module_mutex); |
1552 | list_for_each_entry(use, &mod->target_list, target_list) { |
1553 | nowarn = sysfs_create_link(use->target->holders_dir, |
1554 | &mod->mkobj.kobj, mod->name); |
1555 | } |
1556 | mutex_unlock(&module_mutex); |
1557 | #endif |
1558 | } |
1559 | |
1560 | static void del_usage_links(struct module *mod) |
1561 | { |
1562 | #ifdef CONFIG_MODULE_UNLOAD |
1563 | struct module_use *use; |
1564 | |
1565 | mutex_lock(&module_mutex); |
1566 | list_for_each_entry(use, &mod->target_list, target_list) |
1567 | sysfs_remove_link(use->target->holders_dir, mod->name); |
1568 | mutex_unlock(&module_mutex); |
1569 | #endif |
1570 | } |
1571 | |
1572 | static int module_add_modinfo_attrs(struct module *mod) |
1573 | { |
1574 | struct module_attribute *attr; |
1575 | struct module_attribute *temp_attr; |
1576 | int error = 0; |
1577 | int i; |
1578 | |
1579 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1580 | (ARRAY_SIZE(modinfo_attrs) + 1)), |
1581 | GFP_KERNEL); |
1582 | if (!mod->modinfo_attrs) |
1583 | return -ENOMEM; |
1584 | |
1585 | temp_attr = mod->modinfo_attrs; |
1586 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1587 | if (!attr->test || |
1588 | (attr->test && attr->test(mod))) { |
1589 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
1590 | sysfs_attr_init(&temp_attr->attr); |
1591 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1592 | ++temp_attr; |
1593 | } |
1594 | } |
1595 | return error; |
1596 | } |
1597 | |
1598 | static void module_remove_modinfo_attrs(struct module *mod) |
1599 | { |
1600 | struct module_attribute *attr; |
1601 | int i; |
1602 | |
1603 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1604 | /* pick a field to test for end of list */ |
1605 | if (!attr->attr.name) |
1606 | break; |
1607 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
1608 | if (attr->free) |
1609 | attr->free(mod); |
1610 | } |
1611 | kfree(mod->modinfo_attrs); |
1612 | } |
1613 | |
1614 | static int mod_sysfs_init(struct module *mod) |
1615 | { |
1616 | int err; |
1617 | struct kobject *kobj; |
1618 | |
1619 | if (!module_sysfs_initialized) { |
1620 | printk(KERN_ERR "%s: module sysfs not initialized\n", |
1621 | mod->name); |
1622 | err = -EINVAL; |
1623 | goto out; |
1624 | } |
1625 | |
1626 | kobj = kset_find_obj(module_kset, mod->name); |
1627 | if (kobj) { |
1628 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); |
1629 | kobject_put(kobj); |
1630 | err = -EINVAL; |
1631 | goto out; |
1632 | } |
1633 | |
1634 | mod->mkobj.mod = mod; |
1635 | |
1636 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1637 | mod->mkobj.kobj.kset = module_kset; |
1638 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, |
1639 | "%s", mod->name); |
1640 | if (err) |
1641 | kobject_put(&mod->mkobj.kobj); |
1642 | |
1643 | /* delay uevent until full sysfs population */ |
1644 | out: |
1645 | return err; |
1646 | } |
1647 | |
1648 | static int mod_sysfs_setup(struct module *mod, |
1649 | const struct load_info *info, |
1650 | struct kernel_param *kparam, |
1651 | unsigned int num_params) |
1652 | { |
1653 | int err; |
1654 | |
1655 | err = mod_sysfs_init(mod); |
1656 | if (err) |
1657 | goto out; |
1658 | |
1659 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
1660 | if (!mod->holders_dir) { |
1661 | err = -ENOMEM; |
1662 | goto out_unreg; |
1663 | } |
1664 | |
1665 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1666 | if (err) |
1667 | goto out_unreg_holders; |
1668 | |
1669 | err = module_add_modinfo_attrs(mod); |
1670 | if (err) |
1671 | goto out_unreg_param; |
1672 | |
1673 | add_usage_links(mod); |
1674 | add_sect_attrs(mod, info); |
1675 | add_notes_attrs(mod, info); |
1676 | |
1677 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1678 | return 0; |
1679 | |
1680 | out_unreg_param: |
1681 | module_param_sysfs_remove(mod); |
1682 | out_unreg_holders: |
1683 | kobject_put(mod->holders_dir); |
1684 | out_unreg: |
1685 | kobject_put(&mod->mkobj.kobj); |
1686 | out: |
1687 | return err; |
1688 | } |
1689 | |
1690 | static void mod_sysfs_fini(struct module *mod) |
1691 | { |
1692 | remove_notes_attrs(mod); |
1693 | remove_sect_attrs(mod); |
1694 | kobject_put(&mod->mkobj.kobj); |
1695 | } |
1696 | |
1697 | #else /* !CONFIG_SYSFS */ |
1698 | |
1699 | static int mod_sysfs_setup(struct module *mod, |
1700 | const struct load_info *info, |
1701 | struct kernel_param *kparam, |
1702 | unsigned int num_params) |
1703 | { |
1704 | return 0; |
1705 | } |
1706 | |
1707 | static void mod_sysfs_fini(struct module *mod) |
1708 | { |
1709 | } |
1710 | |
1711 | static void module_remove_modinfo_attrs(struct module *mod) |
1712 | { |
1713 | } |
1714 | |
1715 | static void del_usage_links(struct module *mod) |
1716 | { |
1717 | } |
1718 | |
1719 | #endif /* CONFIG_SYSFS */ |
1720 | |
1721 | static void mod_sysfs_teardown(struct module *mod) |
1722 | { |
1723 | del_usage_links(mod); |
1724 | module_remove_modinfo_attrs(mod); |
1725 | module_param_sysfs_remove(mod); |
1726 | kobject_put(mod->mkobj.drivers_dir); |
1727 | kobject_put(mod->holders_dir); |
1728 | mod_sysfs_fini(mod); |
1729 | } |
1730 | |
1731 | /* |
1732 | * unlink the module with the whole machine is stopped with interrupts off |
1733 | * - this defends against kallsyms not taking locks |
1734 | */ |
1735 | static int __unlink_module(void *_mod) |
1736 | { |
1737 | struct module *mod = _mod; |
1738 | list_del(&mod->list); |
1739 | module_bug_cleanup(mod); |
1740 | return 0; |
1741 | } |
1742 | |
1743 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1744 | /* |
1745 | * LKM RO/NX protection: protect module's text/ro-data |
1746 | * from modification and any data from execution. |
1747 | */ |
1748 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) |
1749 | { |
1750 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); |
1751 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); |
1752 | |
1753 | if (end_pfn > begin_pfn) |
1754 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); |
1755 | } |
1756 | |
1757 | static void set_section_ro_nx(void *base, |
1758 | unsigned long text_size, |
1759 | unsigned long ro_size, |
1760 | unsigned long total_size) |
1761 | { |
1762 | /* begin and end PFNs of the current subsection */ |
1763 | unsigned long begin_pfn; |
1764 | unsigned long end_pfn; |
1765 | |
1766 | /* |
1767 | * Set RO for module text and RO-data: |
1768 | * - Always protect first page. |
1769 | * - Do not protect last partial page. |
1770 | */ |
1771 | if (ro_size > 0) |
1772 | set_page_attributes(base, base + ro_size, set_memory_ro); |
1773 | |
1774 | /* |
1775 | * Set NX permissions for module data: |
1776 | * - Do not protect first partial page. |
1777 | * - Always protect last page. |
1778 | */ |
1779 | if (total_size > text_size) { |
1780 | begin_pfn = PFN_UP((unsigned long)base + text_size); |
1781 | end_pfn = PFN_UP((unsigned long)base + total_size); |
1782 | if (end_pfn > begin_pfn) |
1783 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); |
1784 | } |
1785 | } |
1786 | |
1787 | static void unset_module_core_ro_nx(struct module *mod) |
1788 | { |
1789 | set_page_attributes(mod->module_core + mod->core_text_size, |
1790 | mod->module_core + mod->core_size, |
1791 | set_memory_x); |
1792 | set_page_attributes(mod->module_core, |
1793 | mod->module_core + mod->core_ro_size, |
1794 | set_memory_rw); |
1795 | } |
1796 | |
1797 | static void unset_module_init_ro_nx(struct module *mod) |
1798 | { |
1799 | set_page_attributes(mod->module_init + mod->init_text_size, |
1800 | mod->module_init + mod->init_size, |
1801 | set_memory_x); |
1802 | set_page_attributes(mod->module_init, |
1803 | mod->module_init + mod->init_ro_size, |
1804 | set_memory_rw); |
1805 | } |
1806 | |
1807 | /* Iterate through all modules and set each module's text as RW */ |
1808 | void set_all_modules_text_rw(void) |
1809 | { |
1810 | struct module *mod; |
1811 | |
1812 | mutex_lock(&module_mutex); |
1813 | list_for_each_entry_rcu(mod, &modules, list) { |
1814 | if (mod->state == MODULE_STATE_UNFORMED) |
1815 | continue; |
1816 | if ((mod->module_core) && (mod->core_text_size)) { |
1817 | set_page_attributes(mod->module_core, |
1818 | mod->module_core + mod->core_text_size, |
1819 | set_memory_rw); |
1820 | } |
1821 | if ((mod->module_init) && (mod->init_text_size)) { |
1822 | set_page_attributes(mod->module_init, |
1823 | mod->module_init + mod->init_text_size, |
1824 | set_memory_rw); |
1825 | } |
1826 | } |
1827 | mutex_unlock(&module_mutex); |
1828 | } |
1829 | |
1830 | /* Iterate through all modules and set each module's text as RO */ |
1831 | void set_all_modules_text_ro(void) |
1832 | { |
1833 | struct module *mod; |
1834 | |
1835 | mutex_lock(&module_mutex); |
1836 | list_for_each_entry_rcu(mod, &modules, list) { |
1837 | if (mod->state == MODULE_STATE_UNFORMED) |
1838 | continue; |
1839 | if ((mod->module_core) && (mod->core_text_size)) { |
1840 | set_page_attributes(mod->module_core, |
1841 | mod->module_core + mod->core_text_size, |
1842 | set_memory_ro); |
1843 | } |
1844 | if ((mod->module_init) && (mod->init_text_size)) { |
1845 | set_page_attributes(mod->module_init, |
1846 | mod->module_init + mod->init_text_size, |
1847 | set_memory_ro); |
1848 | } |
1849 | } |
1850 | mutex_unlock(&module_mutex); |
1851 | } |
1852 | #else |
1853 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } |
1854 | static void unset_module_core_ro_nx(struct module *mod) { } |
1855 | static void unset_module_init_ro_nx(struct module *mod) { } |
1856 | #endif |
1857 | |
1858 | void __weak module_free(struct module *mod, void *module_region) |
1859 | { |
1860 | vfree(module_region); |
1861 | } |
1862 | |
1863 | void __weak module_arch_cleanup(struct module *mod) |
1864 | { |
1865 | } |
1866 | |
1867 | /* Free a module, remove from lists, etc. */ |
1868 | static void free_module(struct module *mod) |
1869 | { |
1870 | trace_module_free(mod); |
1871 | |
1872 | mod_sysfs_teardown(mod); |
1873 | |
1874 | /* We leave it in list to prevent duplicate loads, but make sure |
1875 | * that noone uses it while it's being deconstructed. */ |
1876 | mod->state = MODULE_STATE_UNFORMED; |
1877 | |
1878 | /* Remove dynamic debug info */ |
1879 | ddebug_remove_module(mod->name); |
1880 | |
1881 | /* Arch-specific cleanup. */ |
1882 | module_arch_cleanup(mod); |
1883 | |
1884 | /* Module unload stuff */ |
1885 | module_unload_free(mod); |
1886 | |
1887 | /* Free any allocated parameters. */ |
1888 | destroy_params(mod->kp, mod->num_kp); |
1889 | |
1890 | /* Now we can delete it from the lists */ |
1891 | mutex_lock(&module_mutex); |
1892 | stop_machine(__unlink_module, mod, NULL); |
1893 | mutex_unlock(&module_mutex); |
1894 | |
1895 | /* This may be NULL, but that's OK */ |
1896 | unset_module_init_ro_nx(mod); |
1897 | module_free(mod, mod->module_init); |
1898 | kfree(mod->args); |
1899 | percpu_modfree(mod); |
1900 | |
1901 | /* Free lock-classes: */ |
1902 | lockdep_free_key_range(mod->module_core, mod->core_size); |
1903 | |
1904 | /* Finally, free the core (containing the module structure) */ |
1905 | unset_module_core_ro_nx(mod); |
1906 | module_free(mod, mod->module_core); |
1907 | |
1908 | #ifdef CONFIG_MPU |
1909 | update_protections(current->mm); |
1910 | #endif |
1911 | } |
1912 | |
1913 | void *__symbol_get(const char *symbol) |
1914 | { |
1915 | struct module *owner; |
1916 | const struct kernel_symbol *sym; |
1917 | |
1918 | preempt_disable(); |
1919 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1920 | if (sym && strong_try_module_get(owner)) |
1921 | sym = NULL; |
1922 | preempt_enable(); |
1923 | |
1924 | return sym ? (void *)sym->value : NULL; |
1925 | } |
1926 | EXPORT_SYMBOL_GPL(__symbol_get); |
1927 | |
1928 | /* |
1929 | * Ensure that an exported symbol [global namespace] does not already exist |
1930 | * in the kernel or in some other module's exported symbol table. |
1931 | * |
1932 | * You must hold the module_mutex. |
1933 | */ |
1934 | static int verify_export_symbols(struct module *mod) |
1935 | { |
1936 | unsigned int i; |
1937 | struct module *owner; |
1938 | const struct kernel_symbol *s; |
1939 | struct { |
1940 | const struct kernel_symbol *sym; |
1941 | unsigned int num; |
1942 | } arr[] = { |
1943 | { mod->syms, mod->num_syms }, |
1944 | { mod->gpl_syms, mod->num_gpl_syms }, |
1945 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, |
1946 | #ifdef CONFIG_UNUSED_SYMBOLS |
1947 | { mod->unused_syms, mod->num_unused_syms }, |
1948 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, |
1949 | #endif |
1950 | }; |
1951 | |
1952 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1953 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { |
1954 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
1955 | printk(KERN_ERR |
1956 | "%s: exports duplicate symbol %s" |
1957 | " (owned by %s)\n", |
1958 | mod->name, s->name, module_name(owner)); |
1959 | return -ENOEXEC; |
1960 | } |
1961 | } |
1962 | } |
1963 | return 0; |
1964 | } |
1965 | |
1966 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1967 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
1968 | { |
1969 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1970 | Elf_Sym *sym = (void *)symsec->sh_addr; |
1971 | unsigned long secbase; |
1972 | unsigned int i; |
1973 | int ret = 0; |
1974 | const struct kernel_symbol *ksym; |
1975 | |
1976 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
1977 | const char *name = info->strtab + sym[i].st_name; |
1978 | |
1979 | switch (sym[i].st_shndx) { |
1980 | case SHN_COMMON: |
1981 | /* We compiled with -fno-common. These are not |
1982 | supposed to happen. */ |
1983 | pr_debug("Common symbol: %s\n", name); |
1984 | printk("%s: please compile with -fno-common\n", |
1985 | mod->name); |
1986 | ret = -ENOEXEC; |
1987 | break; |
1988 | |
1989 | case SHN_ABS: |
1990 | /* Don't need to do anything */ |
1991 | pr_debug("Absolute symbol: 0x%08lx\n", |
1992 | (long)sym[i].st_value); |
1993 | break; |
1994 | |
1995 | case SHN_UNDEF: |
1996 | ksym = resolve_symbol_wait(mod, info, name); |
1997 | /* Ok if resolved. */ |
1998 | if (ksym && !IS_ERR(ksym)) { |
1999 | sym[i].st_value = ksym->value; |
2000 | break; |
2001 | } |
2002 | |
2003 | /* Ok if weak. */ |
2004 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
2005 | break; |
2006 | |
2007 | printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n", |
2008 | mod->name, name, PTR_ERR(ksym)); |
2009 | ret = PTR_ERR(ksym) ?: -ENOENT; |
2010 | break; |
2011 | |
2012 | default: |
2013 | /* Divert to percpu allocation if a percpu var. */ |
2014 | if (sym[i].st_shndx == info->index.pcpu) |
2015 | secbase = (unsigned long)mod_percpu(mod); |
2016 | else |
2017 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
2018 | sym[i].st_value += secbase; |
2019 | break; |
2020 | } |
2021 | } |
2022 | |
2023 | return ret; |
2024 | } |
2025 | |
2026 | static int apply_relocations(struct module *mod, const struct load_info *info) |
2027 | { |
2028 | unsigned int i; |
2029 | int err = 0; |
2030 | |
2031 | /* Now do relocations. */ |
2032 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2033 | unsigned int infosec = info->sechdrs[i].sh_info; |
2034 | |
2035 | /* Not a valid relocation section? */ |
2036 | if (infosec >= info->hdr->e_shnum) |
2037 | continue; |
2038 | |
2039 | /* Don't bother with non-allocated sections */ |
2040 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
2041 | continue; |
2042 | |
2043 | if (info->sechdrs[i].sh_type == SHT_REL) |
2044 | err = apply_relocate(info->sechdrs, info->strtab, |
2045 | info->index.sym, i, mod); |
2046 | else if (info->sechdrs[i].sh_type == SHT_RELA) |
2047 | err = apply_relocate_add(info->sechdrs, info->strtab, |
2048 | info->index.sym, i, mod); |
2049 | if (err < 0) |
2050 | break; |
2051 | } |
2052 | return err; |
2053 | } |
2054 | |
2055 | /* Additional bytes needed by arch in front of individual sections */ |
2056 | unsigned int __weak arch_mod_section_prepend(struct module *mod, |
2057 | unsigned int section) |
2058 | { |
2059 | /* default implementation just returns zero */ |
2060 | return 0; |
2061 | } |
2062 | |
2063 | /* Update size with this section: return offset. */ |
2064 | static long get_offset(struct module *mod, unsigned int *size, |
2065 | Elf_Shdr *sechdr, unsigned int section) |
2066 | { |
2067 | long ret; |
2068 | |
2069 | *size += arch_mod_section_prepend(mod, section); |
2070 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2071 | *size = ret + sechdr->sh_size; |
2072 | return ret; |
2073 | } |
2074 | |
2075 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld |
2076 | might -- code, read-only data, read-write data, small data. Tally |
2077 | sizes, and place the offsets into sh_entsize fields: high bit means it |
2078 | belongs in init. */ |
2079 | static void layout_sections(struct module *mod, struct load_info *info) |
2080 | { |
2081 | static unsigned long const masks[][2] = { |
2082 | /* NOTE: all executable code must be the first section |
2083 | * in this array; otherwise modify the text_size |
2084 | * finder in the two loops below */ |
2085 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
2086 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, |
2087 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2088 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } |
2089 | }; |
2090 | unsigned int m, i; |
2091 | |
2092 | for (i = 0; i < info->hdr->e_shnum; i++) |
2093 | info->sechdrs[i].sh_entsize = ~0UL; |
2094 | |
2095 | pr_debug("Core section allocation order:\n"); |
2096 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
2097 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2098 | Elf_Shdr *s = &info->sechdrs[i]; |
2099 | const char *sname = info->secstrings + s->sh_name; |
2100 | |
2101 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
2102 | || (s->sh_flags & masks[m][1]) |
2103 | || s->sh_entsize != ~0UL |
2104 | || strstarts(sname, ".init")) |
2105 | continue; |
2106 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
2107 | pr_debug("\t%s\n", sname); |
2108 | } |
2109 | switch (m) { |
2110 | case 0: /* executable */ |
2111 | mod->core_size = debug_align(mod->core_size); |
2112 | mod->core_text_size = mod->core_size; |
2113 | break; |
2114 | case 1: /* RO: text and ro-data */ |
2115 | mod->core_size = debug_align(mod->core_size); |
2116 | mod->core_ro_size = mod->core_size; |
2117 | break; |
2118 | case 3: /* whole core */ |
2119 | mod->core_size = debug_align(mod->core_size); |
2120 | break; |
2121 | } |
2122 | } |
2123 | |
2124 | pr_debug("Init section allocation order:\n"); |
2125 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
2126 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2127 | Elf_Shdr *s = &info->sechdrs[i]; |
2128 | const char *sname = info->secstrings + s->sh_name; |
2129 | |
2130 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
2131 | || (s->sh_flags & masks[m][1]) |
2132 | || s->sh_entsize != ~0UL |
2133 | || !strstarts(sname, ".init")) |
2134 | continue; |
2135 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
2136 | | INIT_OFFSET_MASK); |
2137 | pr_debug("\t%s\n", sname); |
2138 | } |
2139 | switch (m) { |
2140 | case 0: /* executable */ |
2141 | mod->init_size = debug_align(mod->init_size); |
2142 | mod->init_text_size = mod->init_size; |
2143 | break; |
2144 | case 1: /* RO: text and ro-data */ |
2145 | mod->init_size = debug_align(mod->init_size); |
2146 | mod->init_ro_size = mod->init_size; |
2147 | break; |
2148 | case 3: /* whole init */ |
2149 | mod->init_size = debug_align(mod->init_size); |
2150 | break; |
2151 | } |
2152 | } |
2153 | } |
2154 | |
2155 | static void set_license(struct module *mod, const char *license) |
2156 | { |
2157 | if (!license) |
2158 | license = "unspecified"; |
2159 | |
2160 | if (!license_is_gpl_compatible(license)) { |
2161 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
2162 | printk(KERN_WARNING "%s: module license '%s' taints " |
2163 | "kernel.\n", mod->name, license); |
2164 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2165 | LOCKDEP_NOW_UNRELIABLE); |
2166 | } |
2167 | } |
2168 | |
2169 | /* Parse tag=value strings from .modinfo section */ |
2170 | static char *next_string(char *string, unsigned long *secsize) |
2171 | { |
2172 | /* Skip non-zero chars */ |
2173 | while (string[0]) { |
2174 | string++; |
2175 | if ((*secsize)-- <= 1) |
2176 | return NULL; |
2177 | } |
2178 | |
2179 | /* Skip any zero padding. */ |
2180 | while (!string[0]) { |
2181 | string++; |
2182 | if ((*secsize)-- <= 1) |
2183 | return NULL; |
2184 | } |
2185 | return string; |
2186 | } |
2187 | |
2188 | static char *get_modinfo(struct load_info *info, const char *tag) |
2189 | { |
2190 | char *p; |
2191 | unsigned int taglen = strlen(tag); |
2192 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2193 | unsigned long size = infosec->sh_size; |
2194 | |
2195 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
2196 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2197 | return p + taglen + 1; |
2198 | } |
2199 | return NULL; |
2200 | } |
2201 | |
2202 | static void setup_modinfo(struct module *mod, struct load_info *info) |
2203 | { |
2204 | struct module_attribute *attr; |
2205 | int i; |
2206 | |
2207 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
2208 | if (attr->setup) |
2209 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
2210 | } |
2211 | } |
2212 | |
2213 | static void free_modinfo(struct module *mod) |
2214 | { |
2215 | struct module_attribute *attr; |
2216 | int i; |
2217 | |
2218 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
2219 | if (attr->free) |
2220 | attr->free(mod); |
2221 | } |
2222 | } |
2223 | |
2224 | #ifdef CONFIG_KALLSYMS |
2225 | |
2226 | /* lookup symbol in given range of kernel_symbols */ |
2227 | static const struct kernel_symbol *lookup_symbol(const char *name, |
2228 | const struct kernel_symbol *start, |
2229 | const struct kernel_symbol *stop) |
2230 | { |
2231 | return bsearch(name, start, stop - start, |
2232 | sizeof(struct kernel_symbol), cmp_name); |
2233 | } |
2234 | |
2235 | static int is_exported(const char *name, unsigned long value, |
2236 | const struct module *mod) |
2237 | { |
2238 | const struct kernel_symbol *ks; |
2239 | if (!mod) |
2240 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
2241 | else |
2242 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2243 | return ks != NULL && ks->value == value; |
2244 | } |
2245 | |
2246 | /* As per nm */ |
2247 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
2248 | { |
2249 | const Elf_Shdr *sechdrs = info->sechdrs; |
2250 | |
2251 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2252 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) |
2253 | return 'v'; |
2254 | else |
2255 | return 'w'; |
2256 | } |
2257 | if (sym->st_shndx == SHN_UNDEF) |
2258 | return 'U'; |
2259 | if (sym->st_shndx == SHN_ABS) |
2260 | return 'a'; |
2261 | if (sym->st_shndx >= SHN_LORESERVE) |
2262 | return '?'; |
2263 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) |
2264 | return 't'; |
2265 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC |
2266 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { |
2267 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) |
2268 | return 'r'; |
2269 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
2270 | return 'g'; |
2271 | else |
2272 | return 'd'; |
2273 | } |
2274 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { |
2275 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
2276 | return 's'; |
2277 | else |
2278 | return 'b'; |
2279 | } |
2280 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2281 | ".debug")) { |
2282 | return 'n'; |
2283 | } |
2284 | return '?'; |
2285 | } |
2286 | |
2287 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
2288 | unsigned int shnum) |
2289 | { |
2290 | const Elf_Shdr *sec; |
2291 | |
2292 | if (src->st_shndx == SHN_UNDEF |
2293 | || src->st_shndx >= shnum |
2294 | || !src->st_name) |
2295 | return false; |
2296 | |
2297 | sec = sechdrs + src->st_shndx; |
2298 | if (!(sec->sh_flags & SHF_ALLOC) |
2299 | #ifndef CONFIG_KALLSYMS_ALL |
2300 | || !(sec->sh_flags & SHF_EXECINSTR) |
2301 | #endif |
2302 | || (sec->sh_entsize & INIT_OFFSET_MASK)) |
2303 | return false; |
2304 | |
2305 | return true; |
2306 | } |
2307 | |
2308 | /* |
2309 | * We only allocate and copy the strings needed by the parts of symtab |
2310 | * we keep. This is simple, but has the effect of making multiple |
2311 | * copies of duplicates. We could be more sophisticated, see |
2312 | * linux-kernel thread starting with |
2313 | * <73defb5e4bca04a6431392cc341112b1@localhost>. |
2314 | */ |
2315 | static void layout_symtab(struct module *mod, struct load_info *info) |
2316 | { |
2317 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2318 | Elf_Shdr *strsect = info->sechdrs + info->index.str; |
2319 | const Elf_Sym *src; |
2320 | unsigned int i, nsrc, ndst, strtab_size = 0; |
2321 | |
2322 | /* Put symbol section at end of init part of module. */ |
2323 | symsect->sh_flags |= SHF_ALLOC; |
2324 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, |
2325 | info->index.sym) | INIT_OFFSET_MASK; |
2326 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
2327 | |
2328 | src = (void *)info->hdr + symsect->sh_offset; |
2329 | nsrc = symsect->sh_size / sizeof(*src); |
2330 | |
2331 | /* Compute total space required for the core symbols' strtab. */ |
2332 | for (ndst = i = 0; i < nsrc; i++) { |
2333 | if (i == 0 || |
2334 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { |
2335 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
2336 | ndst++; |
2337 | } |
2338 | } |
2339 | |
2340 | /* Append room for core symbols at end of core part. */ |
2341 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
2342 | info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
2343 | mod->core_size += strtab_size; |
2344 | |
2345 | /* Put string table section at end of init part of module. */ |
2346 | strsect->sh_flags |= SHF_ALLOC; |
2347 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, |
2348 | info->index.str) | INIT_OFFSET_MASK; |
2349 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
2350 | } |
2351 | |
2352 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
2353 | { |
2354 | unsigned int i, ndst; |
2355 | const Elf_Sym *src; |
2356 | Elf_Sym *dst; |
2357 | char *s; |
2358 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
2359 | |
2360 | mod->symtab = (void *)symsec->sh_addr; |
2361 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); |
2362 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2363 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
2364 | |
2365 | /* Set types up while we still have access to sections. */ |
2366 | for (i = 0; i < mod->num_symtab; i++) |
2367 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
2368 | |
2369 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
2370 | mod->core_strtab = s = mod->module_core + info->stroffs; |
2371 | src = mod->symtab; |
2372 | for (ndst = i = 0; i < mod->num_symtab; i++) { |
2373 | if (i == 0 || |
2374 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { |
2375 | dst[ndst] = src[i]; |
2376 | dst[ndst++].st_name = s - mod->core_strtab; |
2377 | s += strlcpy(s, &mod->strtab[src[i].st_name], |
2378 | KSYM_NAME_LEN) + 1; |
2379 | } |
2380 | } |
2381 | mod->core_num_syms = ndst; |
2382 | } |
2383 | #else |
2384 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
2385 | { |
2386 | } |
2387 | |
2388 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
2389 | { |
2390 | } |
2391 | #endif /* CONFIG_KALLSYMS */ |
2392 | |
2393 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
2394 | { |
2395 | if (!debug) |
2396 | return; |
2397 | #ifdef CONFIG_DYNAMIC_DEBUG |
2398 | if (ddebug_add_module(debug, num, debug->modname)) |
2399 | printk(KERN_ERR "dynamic debug error adding module: %s\n", |
2400 | debug->modname); |
2401 | #endif |
2402 | } |
2403 | |
2404 | static void dynamic_debug_remove(struct _ddebug *debug) |
2405 | { |
2406 | if (debug) |
2407 | ddebug_remove_module(debug->modname); |
2408 | } |
2409 | |
2410 | void * __weak module_alloc(unsigned long size) |
2411 | { |
2412 | return vmalloc_exec(size); |
2413 | } |
2414 | |
2415 | static void *module_alloc_update_bounds(unsigned long size) |
2416 | { |
2417 | void *ret = module_alloc(size); |
2418 | |
2419 | if (ret) { |
2420 | mutex_lock(&module_mutex); |
2421 | /* Update module bounds. */ |
2422 | if ((unsigned long)ret < module_addr_min) |
2423 | module_addr_min = (unsigned long)ret; |
2424 | if ((unsigned long)ret + size > module_addr_max) |
2425 | module_addr_max = (unsigned long)ret + size; |
2426 | mutex_unlock(&module_mutex); |
2427 | } |
2428 | return ret; |
2429 | } |
2430 | |
2431 | #ifdef CONFIG_DEBUG_KMEMLEAK |
2432 | static void kmemleak_load_module(const struct module *mod, |
2433 | const struct load_info *info) |
2434 | { |
2435 | unsigned int i; |
2436 | |
2437 | /* only scan the sections containing data */ |
2438 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
2439 | |
2440 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2441 | /* Scan all writable sections that's not executable */ |
2442 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || |
2443 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || |
2444 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) |
2445 | continue; |
2446 | |
2447 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2448 | info->sechdrs[i].sh_size, GFP_KERNEL); |
2449 | } |
2450 | } |
2451 | #else |
2452 | static inline void kmemleak_load_module(const struct module *mod, |
2453 | const struct load_info *info) |
2454 | { |
2455 | } |
2456 | #endif |
2457 | |
2458 | #ifdef CONFIG_MODULE_SIG |
2459 | static int module_sig_check(struct load_info *info) |
2460 | { |
2461 | int err = -ENOKEY; |
2462 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2463 | const void *mod = info->hdr; |
2464 | |
2465 | if (info->len > markerlen && |
2466 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
2467 | /* We truncate the module to discard the signature */ |
2468 | info->len -= markerlen; |
2469 | err = mod_verify_sig(mod, &info->len); |
2470 | } |
2471 | |
2472 | if (!err) { |
2473 | info->sig_ok = true; |
2474 | return 0; |
2475 | } |
2476 | |
2477 | /* Not having a signature is only an error if we're strict. */ |
2478 | if (err < 0 && fips_enabled) |
2479 | panic("Module verification failed with error %d in FIPS mode\n", |
2480 | err); |
2481 | if (err == -ENOKEY && !sig_enforce) |
2482 | err = 0; |
2483 | |
2484 | return err; |
2485 | } |
2486 | #else /* !CONFIG_MODULE_SIG */ |
2487 | static int module_sig_check(struct load_info *info) |
2488 | { |
2489 | return 0; |
2490 | } |
2491 | #endif /* !CONFIG_MODULE_SIG */ |
2492 | |
2493 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2494 | static int elf_header_check(struct load_info *info) |
2495 | { |
2496 | if (info->len < sizeof(*(info->hdr))) |
2497 | return -ENOEXEC; |
2498 | |
2499 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 |
2500 | || info->hdr->e_type != ET_REL |
2501 | || !elf_check_arch(info->hdr) |
2502 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) |
2503 | return -ENOEXEC; |
2504 | |
2505 | if (info->hdr->e_shoff >= info->len |
2506 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > |
2507 | info->len - info->hdr->e_shoff)) |
2508 | return -ENOEXEC; |
2509 | |
2510 | return 0; |
2511 | } |
2512 | |
2513 | /* Sets info->hdr and info->len. */ |
2514 | static int copy_module_from_user(const void __user *umod, unsigned long len, |
2515 | struct load_info *info) |
2516 | { |
2517 | int err; |
2518 | |
2519 | info->len = len; |
2520 | if (info->len < sizeof(*(info->hdr))) |
2521 | return -ENOEXEC; |
2522 | |
2523 | err = security_kernel_module_from_file(NULL); |
2524 | if (err) |
2525 | return err; |
2526 | |
2527 | /* Suck in entire file: we'll want most of it. */ |
2528 | info->hdr = vmalloc(info->len); |
2529 | if (!info->hdr) |
2530 | return -ENOMEM; |
2531 | |
2532 | if (copy_from_user(info->hdr, umod, info->len) != 0) { |
2533 | vfree(info->hdr); |
2534 | return -EFAULT; |
2535 | } |
2536 | |
2537 | return 0; |
2538 | } |
2539 | |
2540 | /* Sets info->hdr and info->len. */ |
2541 | static int copy_module_from_fd(int fd, struct load_info *info) |
2542 | { |
2543 | struct file *file; |
2544 | int err; |
2545 | struct kstat stat; |
2546 | loff_t pos; |
2547 | ssize_t bytes = 0; |
2548 | |
2549 | file = fget(fd); |
2550 | if (!file) |
2551 | return -ENOEXEC; |
2552 | |
2553 | err = security_kernel_module_from_file(file); |
2554 | if (err) |
2555 | goto out; |
2556 | |
2557 | err = vfs_getattr(&file->f_path, &stat); |
2558 | if (err) |
2559 | goto out; |
2560 | |
2561 | if (stat.size > INT_MAX) { |
2562 | err = -EFBIG; |
2563 | goto out; |
2564 | } |
2565 | |
2566 | /* Don't hand 0 to vmalloc, it whines. */ |
2567 | if (stat.size == 0) { |
2568 | err = -EINVAL; |
2569 | goto out; |
2570 | } |
2571 | |
2572 | info->hdr = vmalloc(stat.size); |
2573 | if (!info->hdr) { |
2574 | err = -ENOMEM; |
2575 | goto out; |
2576 | } |
2577 | |
2578 | pos = 0; |
2579 | while (pos < stat.size) { |
2580 | bytes = kernel_read(file, pos, (char *)(info->hdr) + pos, |
2581 | stat.size - pos); |
2582 | if (bytes < 0) { |
2583 | vfree(info->hdr); |
2584 | err = bytes; |
2585 | goto out; |
2586 | } |
2587 | if (bytes == 0) |
2588 | break; |
2589 | pos += bytes; |
2590 | } |
2591 | info->len = pos; |
2592 | |
2593 | out: |
2594 | fput(file); |
2595 | return err; |
2596 | } |
2597 | |
2598 | static void free_copy(struct load_info *info) |
2599 | { |
2600 | vfree(info->hdr); |
2601 | } |
2602 | |
2603 | static int rewrite_section_headers(struct load_info *info, int flags) |
2604 | { |
2605 | unsigned int i; |
2606 | |
2607 | /* This should always be true, but let's be sure. */ |
2608 | info->sechdrs[0].sh_addr = 0; |
2609 | |
2610 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2611 | Elf_Shdr *shdr = &info->sechdrs[i]; |
2612 | if (shdr->sh_type != SHT_NOBITS |
2613 | && info->len < shdr->sh_offset + shdr->sh_size) { |
2614 | printk(KERN_ERR "Module len %lu truncated\n", |
2615 | info->len); |
2616 | return -ENOEXEC; |
2617 | } |
2618 | |
2619 | /* Mark all sections sh_addr with their address in the |
2620 | temporary image. */ |
2621 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; |
2622 | |
2623 | #ifndef CONFIG_MODULE_UNLOAD |
2624 | /* Don't load .exit sections */ |
2625 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) |
2626 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; |
2627 | #endif |
2628 | } |
2629 | |
2630 | /* Track but don't keep modinfo and version sections. */ |
2631 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2632 | info->index.vers = 0; /* Pretend no __versions section! */ |
2633 | else |
2634 | info->index.vers = find_sec(info, "__versions"); |
2635 | info->index.info = find_sec(info, ".modinfo"); |
2636 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2637 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2638 | return 0; |
2639 | } |
2640 | |
2641 | /* |
2642 | * Set up our basic convenience variables (pointers to section headers, |
2643 | * search for module section index etc), and do some basic section |
2644 | * verification. |
2645 | * |
2646 | * Return the temporary module pointer (we'll replace it with the final |
2647 | * one when we move the module sections around). |
2648 | */ |
2649 | static struct module *setup_load_info(struct load_info *info, int flags) |
2650 | { |
2651 | unsigned int i; |
2652 | int err; |
2653 | struct module *mod; |
2654 | |
2655 | /* Set up the convenience variables */ |
2656 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; |
2657 | info->secstrings = (void *)info->hdr |
2658 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; |
2659 | |
2660 | err = rewrite_section_headers(info, flags); |
2661 | if (err) |
2662 | return ERR_PTR(err); |
2663 | |
2664 | /* Find internal symbols and strings. */ |
2665 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2666 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2667 | info->index.sym = i; |
2668 | info->index.str = info->sechdrs[i].sh_link; |
2669 | info->strtab = (char *)info->hdr |
2670 | + info->sechdrs[info->index.str].sh_offset; |
2671 | break; |
2672 | } |
2673 | } |
2674 | |
2675 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
2676 | if (!info->index.mod) { |
2677 | printk(KERN_WARNING "No module found in object\n"); |
2678 | return ERR_PTR(-ENOEXEC); |
2679 | } |
2680 | /* This is temporary: point mod into copy of data. */ |
2681 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; |
2682 | |
2683 | if (info->index.sym == 0) { |
2684 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", |
2685 | mod->name); |
2686 | return ERR_PTR(-ENOEXEC); |
2687 | } |
2688 | |
2689 | info->index.pcpu = find_pcpusec(info); |
2690 | |
2691 | /* Check module struct version now, before we try to use module. */ |
2692 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) |
2693 | return ERR_PTR(-ENOEXEC); |
2694 | |
2695 | return mod; |
2696 | } |
2697 | |
2698 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
2699 | { |
2700 | const char *modmagic = get_modinfo(info, "vermagic"); |
2701 | int err; |
2702 | |
2703 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2704 | modmagic = NULL; |
2705 | |
2706 | /* This is allowed: modprobe --force will invalidate it. */ |
2707 | if (!modmagic) { |
2708 | err = try_to_force_load(mod, "bad vermagic"); |
2709 | if (err) |
2710 | return err; |
2711 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
2712 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
2713 | mod->name, modmagic, vermagic); |
2714 | return -ENOEXEC; |
2715 | } |
2716 | |
2717 | if (!get_modinfo(info, "intree")) |
2718 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
2719 | |
2720 | if (get_modinfo(info, "staging")) { |
2721 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
2722 | printk(KERN_WARNING "%s: module is from the staging directory," |
2723 | " the quality is unknown, you have been warned.\n", |
2724 | mod->name); |
2725 | } |
2726 | |
2727 | /* Set up license info based on the info section */ |
2728 | set_license(mod, get_modinfo(info, "license")); |
2729 | |
2730 | return 0; |
2731 | } |
2732 | |
2733 | static void find_module_sections(struct module *mod, struct load_info *info) |
2734 | { |
2735 | mod->kp = section_objs(info, "__param", |
2736 | sizeof(*mod->kp), &mod->num_kp); |
2737 | mod->syms = section_objs(info, "__ksymtab", |
2738 | sizeof(*mod->syms), &mod->num_syms); |
2739 | mod->crcs = section_addr(info, "__kcrctab"); |
2740 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", |
2741 | sizeof(*mod->gpl_syms), |
2742 | &mod->num_gpl_syms); |
2743 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2744 | mod->gpl_future_syms = section_objs(info, |
2745 | "__ksymtab_gpl_future", |
2746 | sizeof(*mod->gpl_future_syms), |
2747 | &mod->num_gpl_future_syms); |
2748 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
2749 | |
2750 | #ifdef CONFIG_UNUSED_SYMBOLS |
2751 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
2752 | sizeof(*mod->unused_syms), |
2753 | &mod->num_unused_syms); |
2754 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2755 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", |
2756 | sizeof(*mod->unused_gpl_syms), |
2757 | &mod->num_unused_gpl_syms); |
2758 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
2759 | #endif |
2760 | #ifdef CONFIG_CONSTRUCTORS |
2761 | mod->ctors = section_objs(info, ".ctors", |
2762 | sizeof(*mod->ctors), &mod->num_ctors); |
2763 | #endif |
2764 | |
2765 | #ifdef CONFIG_TRACEPOINTS |
2766 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2767 | sizeof(*mod->tracepoints_ptrs), |
2768 | &mod->num_tracepoints); |
2769 | #endif |
2770 | #ifdef HAVE_JUMP_LABEL |
2771 | mod->jump_entries = section_objs(info, "__jump_table", |
2772 | sizeof(*mod->jump_entries), |
2773 | &mod->num_jump_entries); |
2774 | #endif |
2775 | #ifdef CONFIG_EVENT_TRACING |
2776 | mod->trace_events = section_objs(info, "_ftrace_events", |
2777 | sizeof(*mod->trace_events), |
2778 | &mod->num_trace_events); |
2779 | #endif |
2780 | #ifdef CONFIG_TRACING |
2781 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", |
2782 | sizeof(*mod->trace_bprintk_fmt_start), |
2783 | &mod->num_trace_bprintk_fmt); |
2784 | #endif |
2785 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2786 | /* sechdrs[0].sh_size is always zero */ |
2787 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
2788 | sizeof(*mod->ftrace_callsites), |
2789 | &mod->num_ftrace_callsites); |
2790 | #endif |
2791 | |
2792 | mod->extable = section_objs(info, "__ex_table", |
2793 | sizeof(*mod->extable), &mod->num_exentries); |
2794 | |
2795 | if (section_addr(info, "__obsparm")) |
2796 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2797 | mod->name); |
2798 | |
2799 | info->debug = section_objs(info, "__verbose", |
2800 | sizeof(*info->debug), &info->num_debug); |
2801 | } |
2802 | |
2803 | static int move_module(struct module *mod, struct load_info *info) |
2804 | { |
2805 | int i; |
2806 | void *ptr; |
2807 | |
2808 | /* Do the allocs. */ |
2809 | ptr = module_alloc_update_bounds(mod->core_size); |
2810 | /* |
2811 | * The pointer to this block is stored in the module structure |
2812 | * which is inside the block. Just mark it as not being a |
2813 | * leak. |
2814 | */ |
2815 | kmemleak_not_leak(ptr); |
2816 | if (!ptr) |
2817 | return -ENOMEM; |
2818 | |
2819 | memset(ptr, 0, mod->core_size); |
2820 | mod->module_core = ptr; |
2821 | |
2822 | if (mod->init_size) { |
2823 | ptr = module_alloc_update_bounds(mod->init_size); |
2824 | /* |
2825 | * The pointer to this block is stored in the module structure |
2826 | * which is inside the block. This block doesn't need to be |
2827 | * scanned as it contains data and code that will be freed |
2828 | * after the module is initialized. |
2829 | */ |
2830 | kmemleak_ignore(ptr); |
2831 | if (!ptr) { |
2832 | module_free(mod, mod->module_core); |
2833 | return -ENOMEM; |
2834 | } |
2835 | memset(ptr, 0, mod->init_size); |
2836 | mod->module_init = ptr; |
2837 | } else |
2838 | mod->module_init = NULL; |
2839 | |
2840 | /* Transfer each section which specifies SHF_ALLOC */ |
2841 | pr_debug("final section addresses:\n"); |
2842 | for (i = 0; i < info->hdr->e_shnum; i++) { |
2843 | void *dest; |
2844 | Elf_Shdr *shdr = &info->sechdrs[i]; |
2845 | |
2846 | if (!(shdr->sh_flags & SHF_ALLOC)) |
2847 | continue; |
2848 | |
2849 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
2850 | dest = mod->module_init |
2851 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
2852 | else |
2853 | dest = mod->module_core + shdr->sh_entsize; |
2854 | |
2855 | if (shdr->sh_type != SHT_NOBITS) |
2856 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); |
2857 | /* Update sh_addr to point to copy in image. */ |
2858 | shdr->sh_addr = (unsigned long)dest; |
2859 | pr_debug("\t0x%lx %s\n", |
2860 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); |
2861 | } |
2862 | |
2863 | return 0; |
2864 | } |
2865 | |
2866 | static int check_module_license_and_versions(struct module *mod) |
2867 | { |
2868 | /* |
2869 | * ndiswrapper is under GPL by itself, but loads proprietary modules. |
2870 | * Don't use add_taint_module(), as it would prevent ndiswrapper from |
2871 | * using GPL-only symbols it needs. |
2872 | */ |
2873 | if (strcmp(mod->name, "ndiswrapper") == 0) |
2874 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
2875 | |
2876 | /* driverloader was caught wrongly pretending to be under GPL */ |
2877 | if (strcmp(mod->name, "driverloader") == 0) |
2878 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2879 | LOCKDEP_NOW_UNRELIABLE); |
2880 | |
2881 | /* lve claims to be GPL but upstream won't provide source */ |
2882 | if (strcmp(mod->name, "lve") == 0) |
2883 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2884 | LOCKDEP_NOW_UNRELIABLE); |
2885 | |
2886 | #ifdef CONFIG_MODVERSIONS |
2887 | if ((mod->num_syms && !mod->crcs) |
2888 | || (mod->num_gpl_syms && !mod->gpl_crcs) |
2889 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) |
2890 | #ifdef CONFIG_UNUSED_SYMBOLS |
2891 | || (mod->num_unused_syms && !mod->unused_crcs) |
2892 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) |
2893 | #endif |
2894 | ) { |
2895 | return try_to_force_load(mod, |
2896 | "no versions for exported symbols"); |
2897 | } |
2898 | #endif |
2899 | return 0; |
2900 | } |
2901 | |
2902 | static void flush_module_icache(const struct module *mod) |
2903 | { |
2904 | mm_segment_t old_fs; |
2905 | |
2906 | /* flush the icache in correct context */ |
2907 | old_fs = get_fs(); |
2908 | set_fs(KERNEL_DS); |
2909 | |
2910 | /* |
2911 | * Flush the instruction cache, since we've played with text. |
2912 | * Do it before processing of module parameters, so the module |
2913 | * can provide parameter accessor functions of its own. |
2914 | */ |
2915 | if (mod->module_init) |
2916 | flush_icache_range((unsigned long)mod->module_init, |
2917 | (unsigned long)mod->module_init |
2918 | + mod->init_size); |
2919 | flush_icache_range((unsigned long)mod->module_core, |
2920 | (unsigned long)mod->module_core + mod->core_size); |
2921 | |
2922 | set_fs(old_fs); |
2923 | } |
2924 | |
2925 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
2926 | Elf_Shdr *sechdrs, |
2927 | char *secstrings, |
2928 | struct module *mod) |
2929 | { |
2930 | return 0; |
2931 | } |
2932 | |
2933 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
2934 | { |
2935 | /* Module within temporary copy. */ |
2936 | struct module *mod; |
2937 | int err; |
2938 | |
2939 | mod = setup_load_info(info, flags); |
2940 | if (IS_ERR(mod)) |
2941 | return mod; |
2942 | |
2943 | err = check_modinfo(mod, info, flags); |
2944 | if (err) |
2945 | return ERR_PTR(err); |
2946 | |
2947 | /* Allow arches to frob section contents and sizes. */ |
2948 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
2949 | info->secstrings, mod); |
2950 | if (err < 0) |
2951 | return ERR_PTR(err); |
2952 | |
2953 | /* We will do a special allocation for per-cpu sections later. */ |
2954 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2955 | |
2956 | /* Determine total sizes, and put offsets in sh_entsize. For now |
2957 | this is done generically; there doesn't appear to be any |
2958 | special cases for the architectures. */ |
2959 | layout_sections(mod, info); |
2960 | layout_symtab(mod, info); |
2961 | |
2962 | /* Allocate and move to the final place */ |
2963 | err = move_module(mod, info); |
2964 | if (err) |
2965 | return ERR_PTR(err); |
2966 | |
2967 | /* Module has been copied to its final place now: return it. */ |
2968 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; |
2969 | kmemleak_load_module(mod, info); |
2970 | return mod; |
2971 | } |
2972 | |
2973 | /* mod is no longer valid after this! */ |
2974 | static void module_deallocate(struct module *mod, struct load_info *info) |
2975 | { |
2976 | percpu_modfree(mod); |
2977 | module_free(mod, mod->module_init); |
2978 | module_free(mod, mod->module_core); |
2979 | } |
2980 | |
2981 | int __weak module_finalize(const Elf_Ehdr *hdr, |
2982 | const Elf_Shdr *sechdrs, |
2983 | struct module *me) |
2984 | { |
2985 | return 0; |
2986 | } |
2987 | |
2988 | static int post_relocation(struct module *mod, const struct load_info *info) |
2989 | { |
2990 | /* Sort exception table now relocations are done. */ |
2991 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
2992 | |
2993 | /* Copy relocated percpu area over. */ |
2994 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, |
2995 | info->sechdrs[info->index.pcpu].sh_size); |
2996 | |
2997 | /* Setup kallsyms-specific fields. */ |
2998 | add_kallsyms(mod, info); |
2999 | |
3000 | /* Arch-specific module finalizing. */ |
3001 | return module_finalize(info->hdr, info->sechdrs, mod); |
3002 | } |
3003 | |
3004 | /* Is this module of this name done loading? No locks held. */ |
3005 | static bool finished_loading(const char *name) |
3006 | { |
3007 | struct module *mod; |
3008 | bool ret; |
3009 | |
3010 | mutex_lock(&module_mutex); |
3011 | mod = find_module_all(name, strlen(name), true); |
3012 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3013 | || mod->state == MODULE_STATE_GOING; |
3014 | mutex_unlock(&module_mutex); |
3015 | |
3016 | return ret; |
3017 | } |
3018 | |
3019 | /* Call module constructors. */ |
3020 | static void do_mod_ctors(struct module *mod) |
3021 | { |
3022 | #ifdef CONFIG_CONSTRUCTORS |
3023 | unsigned long i; |
3024 | |
3025 | for (i = 0; i < mod->num_ctors; i++) |
3026 | mod->ctors[i](); |
3027 | #endif |
3028 | } |
3029 | |
3030 | /* This is where the real work happens */ |
3031 | static int do_init_module(struct module *mod) |
3032 | { |
3033 | int ret = 0; |
3034 | |
3035 | /* |
3036 | * We want to find out whether @mod uses async during init. Clear |
3037 | * PF_USED_ASYNC. async_schedule*() will set it. |
3038 | */ |
3039 | current->flags &= ~PF_USED_ASYNC; |
3040 | |
3041 | blocking_notifier_call_chain(&module_notify_list, |
3042 | MODULE_STATE_COMING, mod); |
3043 | |
3044 | /* Set RO and NX regions for core */ |
3045 | set_section_ro_nx(mod->module_core, |
3046 | mod->core_text_size, |
3047 | mod->core_ro_size, |
3048 | mod->core_size); |
3049 | |
3050 | /* Set RO and NX regions for init */ |
3051 | set_section_ro_nx(mod->module_init, |
3052 | mod->init_text_size, |
3053 | mod->init_ro_size, |
3054 | mod->init_size); |
3055 | |
3056 | do_mod_ctors(mod); |
3057 | /* Start the module */ |
3058 | if (mod->init != NULL) |
3059 | ret = do_one_initcall(mod->init); |
3060 | if (ret < 0) { |
3061 | /* Init routine failed: abort. Try to protect us from |
3062 | buggy refcounters. */ |
3063 | mod->state = MODULE_STATE_GOING; |
3064 | synchronize_sched(); |
3065 | module_put(mod); |
3066 | blocking_notifier_call_chain(&module_notify_list, |
3067 | MODULE_STATE_GOING, mod); |
3068 | free_module(mod); |
3069 | wake_up_all(&module_wq); |
3070 | return ret; |
3071 | } |
3072 | if (ret > 0) { |
3073 | printk(KERN_WARNING |
3074 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" |
3075 | "%s: loading module anyway...\n", |
3076 | __func__, mod->name, ret, |
3077 | __func__); |
3078 | dump_stack(); |
3079 | } |
3080 | |
3081 | /* Now it's a first class citizen! */ |
3082 | mod->state = MODULE_STATE_LIVE; |
3083 | blocking_notifier_call_chain(&module_notify_list, |
3084 | MODULE_STATE_LIVE, mod); |
3085 | |
3086 | /* |
3087 | * We need to finish all async code before the module init sequence |
3088 | * is done. This has potential to deadlock. For example, a newly |
3089 | * detected block device can trigger request_module() of the |
3090 | * default iosched from async probing task. Once userland helper |
3091 | * reaches here, async_synchronize_full() will wait on the async |
3092 | * task waiting on request_module() and deadlock. |
3093 | * |
3094 | * This deadlock is avoided by perfomring async_synchronize_full() |
3095 | * iff module init queued any async jobs. This isn't a full |
3096 | * solution as it will deadlock the same if module loading from |
3097 | * async jobs nests more than once; however, due to the various |
3098 | * constraints, this hack seems to be the best option for now. |
3099 | * Please refer to the following thread for details. |
3100 | * |
3101 | * http://thread.gmane.org/gmane.linux.kernel/1420814 |
3102 | */ |
3103 | if (current->flags & PF_USED_ASYNC) |
3104 | async_synchronize_full(); |
3105 | |
3106 | mutex_lock(&module_mutex); |
3107 | /* Drop initial reference. */ |
3108 | module_put(mod); |
3109 | trim_init_extable(mod); |
3110 | #ifdef CONFIG_KALLSYMS |
3111 | mod->num_symtab = mod->core_num_syms; |
3112 | mod->symtab = mod->core_symtab; |
3113 | mod->strtab = mod->core_strtab; |
3114 | #endif |
3115 | unset_module_init_ro_nx(mod); |
3116 | module_free(mod, mod->module_init); |
3117 | mod->module_init = NULL; |
3118 | mod->init_size = 0; |
3119 | mod->init_ro_size = 0; |
3120 | mod->init_text_size = 0; |
3121 | mutex_unlock(&module_mutex); |
3122 | wake_up_all(&module_wq); |
3123 | |
3124 | return 0; |
3125 | } |
3126 | |
3127 | static int may_init_module(void) |
3128 | { |
3129 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
3130 | return -EPERM; |
3131 | |
3132 | return 0; |
3133 | } |
3134 | |
3135 | /* |
3136 | * We try to place it in the list now to make sure it's unique before |
3137 | * we dedicate too many resources. In particular, temporary percpu |
3138 | * memory exhaustion. |
3139 | */ |
3140 | static int add_unformed_module(struct module *mod) |
3141 | { |
3142 | int err; |
3143 | struct module *old; |
3144 | |
3145 | mod->state = MODULE_STATE_UNFORMED; |
3146 | |
3147 | again: |
3148 | mutex_lock(&module_mutex); |
3149 | old = find_module_all(mod->name, strlen(mod->name), true); |
3150 | if (old != NULL) { |
3151 | if (old->state == MODULE_STATE_COMING |
3152 | || old->state == MODULE_STATE_UNFORMED) { |
3153 | /* Wait in case it fails to load. */ |
3154 | mutex_unlock(&module_mutex); |
3155 | err = wait_event_interruptible(module_wq, |
3156 | finished_loading(mod->name)); |
3157 | if (err) |
3158 | goto out_unlocked; |
3159 | goto again; |
3160 | } |
3161 | err = -EEXIST; |
3162 | goto out; |
3163 | } |
3164 | list_add_rcu(&mod->list, &modules); |
3165 | err = 0; |
3166 | |
3167 | out: |
3168 | mutex_unlock(&module_mutex); |
3169 | out_unlocked: |
3170 | return err; |
3171 | } |
3172 | |
3173 | static int complete_formation(struct module *mod, struct load_info *info) |
3174 | { |
3175 | int err; |
3176 | |
3177 | mutex_lock(&module_mutex); |
3178 | |
3179 | /* Find duplicate symbols (must be called under lock). */ |
3180 | err = verify_export_symbols(mod); |
3181 | if (err < 0) |
3182 | goto out; |
3183 | |
3184 | /* This relies on module_mutex for list integrity. */ |
3185 | module_bug_finalize(info->hdr, info->sechdrs, mod); |
3186 | |
3187 | /* Mark state as coming so strong_try_module_get() ignores us, |
3188 | * but kallsyms etc. can see us. */ |
3189 | mod->state = MODULE_STATE_COMING; |
3190 | |
3191 | out: |
3192 | mutex_unlock(&module_mutex); |
3193 | return err; |
3194 | } |
3195 | |
3196 | static int unknown_module_param_cb(char *param, char *val, const char *modname) |
3197 | { |
3198 | /* Check for magic 'dyndbg' arg */ |
3199 | int ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
3200 | if (ret != 0) { |
3201 | printk(KERN_WARNING "%s: unknown parameter '%s' ignored\n", |
3202 | modname, param); |
3203 | } |
3204 | return 0; |
3205 | } |
3206 | |
3207 | /* Allocate and load the module: note that size of section 0 is always |
3208 | zero, and we rely on this for optional sections. */ |
3209 | static int load_module(struct load_info *info, const char __user *uargs, |
3210 | int flags) |
3211 | { |
3212 | struct module *mod; |
3213 | long err; |
3214 | |
3215 | err = module_sig_check(info); |
3216 | if (err) |
3217 | goto free_copy; |
3218 | |
3219 | err = elf_header_check(info); |
3220 | if (err) |
3221 | goto free_copy; |
3222 | |
3223 | /* Figure out module layout, and allocate all the memory. */ |
3224 | mod = layout_and_allocate(info, flags); |
3225 | if (IS_ERR(mod)) { |
3226 | err = PTR_ERR(mod); |
3227 | goto free_copy; |
3228 | } |
3229 | |
3230 | /* Reserve our place in the list. */ |
3231 | err = add_unformed_module(mod); |
3232 | if (err) |
3233 | goto free_module; |
3234 | |
3235 | #ifdef CONFIG_MODULE_SIG |
3236 | mod->sig_ok = info->sig_ok; |
3237 | if (!mod->sig_ok) { |
3238 | printk_once(KERN_NOTICE |
3239 | "%s: module verification failed: signature and/or" |
3240 | " required key missing - tainting kernel\n", |
3241 | mod->name); |
3242 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_STILL_OK); |
3243 | } |
3244 | #endif |
3245 | |
3246 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
3247 | err = percpu_modalloc(mod, info); |
3248 | if (err) |
3249 | goto unlink_mod; |
3250 | |
3251 | /* Now module is in final location, initialize linked lists, etc. */ |
3252 | err = module_unload_init(mod); |
3253 | if (err) |
3254 | goto unlink_mod; |
3255 | |
3256 | /* Now we've got everything in the final locations, we can |
3257 | * find optional sections. */ |
3258 | find_module_sections(mod, info); |
3259 | |
3260 | err = check_module_license_and_versions(mod); |
3261 | if (err) |
3262 | goto free_unload; |
3263 | |
3264 | /* Set up MODINFO_ATTR fields */ |
3265 | setup_modinfo(mod, info); |
3266 | |
3267 | /* Fix up syms, so that st_value is a pointer to location. */ |
3268 | err = simplify_symbols(mod, info); |
3269 | if (err < 0) |
3270 | goto free_modinfo; |
3271 | |
3272 | err = apply_relocations(mod, info); |
3273 | if (err < 0) |
3274 | goto free_modinfo; |
3275 | |
3276 | err = post_relocation(mod, info); |
3277 | if (err < 0) |
3278 | goto free_modinfo; |
3279 | |
3280 | flush_module_icache(mod); |
3281 | |
3282 | /* Now copy in args */ |
3283 | mod->args = strndup_user(uargs, ~0UL >> 1); |
3284 | if (IS_ERR(mod->args)) { |
3285 | err = PTR_ERR(mod->args); |
3286 | goto free_arch_cleanup; |
3287 | } |
3288 | |
3289 | dynamic_debug_setup(info->debug, info->num_debug); |
3290 | |
3291 | /* Finally it's fully formed, ready to start executing. */ |
3292 | err = complete_formation(mod, info); |
3293 | if (err) |
3294 | goto ddebug_cleanup; |
3295 | |
3296 | /* Module is ready to execute: parsing args may do that. */ |
3297 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
3298 | -32768, 32767, unknown_module_param_cb); |
3299 | if (err < 0) |
3300 | goto bug_cleanup; |
3301 | |
3302 | /* Link in to syfs. */ |
3303 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
3304 | if (err < 0) |
3305 | goto bug_cleanup; |
3306 | |
3307 | /* Get rid of temporary copy. */ |
3308 | free_copy(info); |
3309 | |
3310 | /* Done! */ |
3311 | trace_module_load(mod); |
3312 | |
3313 | return do_init_module(mod); |
3314 | |
3315 | bug_cleanup: |
3316 | /* module_bug_cleanup needs module_mutex protection */ |
3317 | mutex_lock(&module_mutex); |
3318 | module_bug_cleanup(mod); |
3319 | mutex_unlock(&module_mutex); |
3320 | ddebug_cleanup: |
3321 | dynamic_debug_remove(info->debug); |
3322 | synchronize_sched(); |
3323 | kfree(mod->args); |
3324 | free_arch_cleanup: |
3325 | module_arch_cleanup(mod); |
3326 | free_modinfo: |
3327 | free_modinfo(mod); |
3328 | free_unload: |
3329 | module_unload_free(mod); |
3330 | unlink_mod: |
3331 | mutex_lock(&module_mutex); |
3332 | /* Unlink carefully: kallsyms could be walking list. */ |
3333 | list_del_rcu(&mod->list); |
3334 | wake_up_all(&module_wq); |
3335 | mutex_unlock(&module_mutex); |
3336 | free_module: |
3337 | module_deallocate(mod, info); |
3338 | free_copy: |
3339 | free_copy(info); |
3340 | return err; |
3341 | } |
3342 | |
3343 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3344 | unsigned long, len, const char __user *, uargs) |
3345 | { |
3346 | int err; |
3347 | struct load_info info = { }; |
3348 | |
3349 | err = may_init_module(); |
3350 | if (err) |
3351 | return err; |
3352 | |
3353 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3354 | umod, len, uargs); |
3355 | |
3356 | err = copy_module_from_user(umod, len, &info); |
3357 | if (err) |
3358 | return err; |
3359 | |
3360 | return load_module(&info, uargs, 0); |
3361 | } |
3362 | |
3363 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
3364 | { |
3365 | int err; |
3366 | struct load_info info = { }; |
3367 | |
3368 | err = may_init_module(); |
3369 | if (err) |
3370 | return err; |
3371 | |
3372 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
3373 | |
3374 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3375 | |MODULE_INIT_IGNORE_VERMAGIC)) |
3376 | return -EINVAL; |
3377 | |
3378 | err = copy_module_from_fd(fd, &info); |
3379 | if (err) |
3380 | return err; |
3381 | |
3382 | return load_module(&info, uargs, flags); |
3383 | } |
3384 | |
3385 | static inline int within(unsigned long addr, void *start, unsigned long size) |
3386 | { |
3387 | return ((void *)addr >= start && (void *)addr < start + size); |
3388 | } |
3389 | |
3390 | #ifdef CONFIG_KALLSYMS |
3391 | /* |
3392 | * This ignores the intensely annoying "mapping symbols" found |
3393 | * in ARM ELF files: $a, $t and $d. |
3394 | */ |
3395 | static inline int is_arm_mapping_symbol(const char *str) |
3396 | { |
3397 | return str[0] == '$' && strchr("atd", str[1]) |
3398 | && (str[2] == '\0' || str[2] == '.'); |
3399 | } |
3400 | |
3401 | static const char *get_ksymbol(struct module *mod, |
3402 | unsigned long addr, |
3403 | unsigned long *size, |
3404 | unsigned long *offset) |
3405 | { |
3406 | unsigned int i, best = 0; |
3407 | unsigned long nextval; |
3408 | |
3409 | /* At worse, next value is at end of module */ |
3410 | if (within_module_init(addr, mod)) |
3411 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
3412 | else |
3413 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
3414 | |
3415 | /* Scan for closest preceding symbol, and next symbol. (ELF |
3416 | starts real symbols at 1). */ |
3417 | for (i = 1; i < mod->num_symtab; i++) { |
3418 | if (mod->symtab[i].st_shndx == SHN_UNDEF) |
3419 | continue; |
3420 | |
3421 | /* We ignore unnamed symbols: they're uninformative |
3422 | * and inserted at a whim. */ |
3423 | if (mod->symtab[i].st_value <= addr |
3424 | && mod->symtab[i].st_value > mod->symtab[best].st_value |
3425 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
3426 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
3427 | best = i; |
3428 | if (mod->symtab[i].st_value > addr |
3429 | && mod->symtab[i].st_value < nextval |
3430 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
3431 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
3432 | nextval = mod->symtab[i].st_value; |
3433 | } |
3434 | |
3435 | if (!best) |
3436 | return NULL; |
3437 | |
3438 | if (size) |
3439 | *size = nextval - mod->symtab[best].st_value; |
3440 | if (offset) |
3441 | *offset = addr - mod->symtab[best].st_value; |
3442 | return mod->strtab + mod->symtab[best].st_name; |
3443 | } |
3444 | |
3445 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3446 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ |
3447 | const char *module_address_lookup(unsigned long addr, |
3448 | unsigned long *size, |
3449 | unsigned long *offset, |
3450 | char **modname, |
3451 | char *namebuf) |
3452 | { |
3453 | struct module *mod; |
3454 | const char *ret = NULL; |
3455 | |
3456 | preempt_disable(); |
3457 | list_for_each_entry_rcu(mod, &modules, list) { |
3458 | if (mod->state == MODULE_STATE_UNFORMED) |
3459 | continue; |
3460 | if (within_module_init(addr, mod) || |
3461 | within_module_core(addr, mod)) { |
3462 | if (modname) |
3463 | *modname = mod->name; |
3464 | ret = get_ksymbol(mod, addr, size, offset); |
3465 | break; |
3466 | } |
3467 | } |
3468 | /* Make a copy in here where it's safe */ |
3469 | if (ret) { |
3470 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); |
3471 | ret = namebuf; |
3472 | } |
3473 | preempt_enable(); |
3474 | return ret; |
3475 | } |
3476 | |
3477 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3478 | { |
3479 | struct module *mod; |
3480 | |
3481 | preempt_disable(); |
3482 | list_for_each_entry_rcu(mod, &modules, list) { |
3483 | if (mod->state == MODULE_STATE_UNFORMED) |
3484 | continue; |
3485 | if (within_module_init(addr, mod) || |
3486 | within_module_core(addr, mod)) { |
3487 | const char *sym; |
3488 | |
3489 | sym = get_ksymbol(mod, addr, NULL, NULL); |
3490 | if (!sym) |
3491 | goto out; |
3492 | strlcpy(symname, sym, KSYM_NAME_LEN); |
3493 | preempt_enable(); |
3494 | return 0; |
3495 | } |
3496 | } |
3497 | out: |
3498 | preempt_enable(); |
3499 | return -ERANGE; |
3500 | } |
3501 | |
3502 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3503 | unsigned long *offset, char *modname, char *name) |
3504 | { |
3505 | struct module *mod; |
3506 | |
3507 | preempt_disable(); |
3508 | list_for_each_entry_rcu(mod, &modules, list) { |
3509 | if (mod->state == MODULE_STATE_UNFORMED) |
3510 | continue; |
3511 | if (within_module_init(addr, mod) || |
3512 | within_module_core(addr, mod)) { |
3513 | const char *sym; |
3514 | |
3515 | sym = get_ksymbol(mod, addr, size, offset); |
3516 | if (!sym) |
3517 | goto out; |
3518 | if (modname) |
3519 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
3520 | if (name) |
3521 | strlcpy(name, sym, KSYM_NAME_LEN); |
3522 | preempt_enable(); |
3523 | return 0; |
3524 | } |
3525 | } |
3526 | out: |
3527 | preempt_enable(); |
3528 | return -ERANGE; |
3529 | } |
3530 | |
3531 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3532 | char *name, char *module_name, int *exported) |
3533 | { |
3534 | struct module *mod; |
3535 | |
3536 | preempt_disable(); |
3537 | list_for_each_entry_rcu(mod, &modules, list) { |
3538 | if (mod->state == MODULE_STATE_UNFORMED) |
3539 | continue; |
3540 | if (symnum < mod->num_symtab) { |
3541 | *value = mod->symtab[symnum].st_value; |
3542 | *type = mod->symtab[symnum].st_info; |
3543 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
3544 | KSYM_NAME_LEN); |
3545 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
3546 | *exported = is_exported(name, *value, mod); |
3547 | preempt_enable(); |
3548 | return 0; |
3549 | } |
3550 | symnum -= mod->num_symtab; |
3551 | } |
3552 | preempt_enable(); |
3553 | return -ERANGE; |
3554 | } |
3555 | |
3556 | static unsigned long mod_find_symname(struct module *mod, const char *name) |
3557 | { |
3558 | unsigned int i; |
3559 | |
3560 | for (i = 0; i < mod->num_symtab; i++) |
3561 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3562 | mod->symtab[i].st_info != 'U') |
3563 | return mod->symtab[i].st_value; |
3564 | return 0; |
3565 | } |
3566 | |
3567 | /* Look for this name: can be of form module:name. */ |
3568 | unsigned long module_kallsyms_lookup_name(const char *name) |
3569 | { |
3570 | struct module *mod; |
3571 | char *colon; |
3572 | unsigned long ret = 0; |
3573 | |
3574 | /* Don't lock: we're in enough trouble already. */ |
3575 | preempt_disable(); |
3576 | if ((colon = strchr(name, ':')) != NULL) { |
3577 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
3578 | ret = mod_find_symname(mod, colon+1); |
3579 | } else { |
3580 | list_for_each_entry_rcu(mod, &modules, list) { |
3581 | if (mod->state == MODULE_STATE_UNFORMED) |
3582 | continue; |
3583 | if ((ret = mod_find_symname(mod, name)) != 0) |
3584 | break; |
3585 | } |
3586 | } |
3587 | preempt_enable(); |
3588 | return ret; |
3589 | } |
3590 | |
3591 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, |
3592 | struct module *, unsigned long), |
3593 | void *data) |
3594 | { |
3595 | struct module *mod; |
3596 | unsigned int i; |
3597 | int ret; |
3598 | |
3599 | list_for_each_entry(mod, &modules, list) { |
3600 | if (mod->state == MODULE_STATE_UNFORMED) |
3601 | continue; |
3602 | for (i = 0; i < mod->num_symtab; i++) { |
3603 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, |
3604 | mod, mod->symtab[i].st_value); |
3605 | if (ret != 0) |
3606 | return ret; |
3607 | } |
3608 | } |
3609 | return 0; |
3610 | } |
3611 | #endif /* CONFIG_KALLSYMS */ |
3612 | |
3613 | static char *module_flags(struct module *mod, char *buf) |
3614 | { |
3615 | int bx = 0; |
3616 | |
3617 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
3618 | if (mod->taints || |
3619 | mod->state == MODULE_STATE_GOING || |
3620 | mod->state == MODULE_STATE_COMING) { |
3621 | buf[bx++] = '('; |
3622 | bx += module_flags_taint(mod, buf + bx); |
3623 | /* Show a - for module-is-being-unloaded */ |
3624 | if (mod->state == MODULE_STATE_GOING) |
3625 | buf[bx++] = '-'; |
3626 | /* Show a + for module-is-being-loaded */ |
3627 | if (mod->state == MODULE_STATE_COMING) |
3628 | buf[bx++] = '+'; |
3629 | buf[bx++] = ')'; |
3630 | } |
3631 | buf[bx] = '\0'; |
3632 | |
3633 | return buf; |
3634 | } |
3635 | |
3636 | #ifdef CONFIG_PROC_FS |
3637 | /* Called by the /proc file system to return a list of modules. */ |
3638 | static void *m_start(struct seq_file *m, loff_t *pos) |
3639 | { |
3640 | mutex_lock(&module_mutex); |
3641 | return seq_list_start(&modules, *pos); |
3642 | } |
3643 | |
3644 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) |
3645 | { |
3646 | return seq_list_next(p, &modules, pos); |
3647 | } |
3648 | |
3649 | static void m_stop(struct seq_file *m, void *p) |
3650 | { |
3651 | mutex_unlock(&module_mutex); |
3652 | } |
3653 | |
3654 | static int m_show(struct seq_file *m, void *p) |
3655 | { |
3656 | struct module *mod = list_entry(p, struct module, list); |
3657 | char buf[8]; |
3658 | |
3659 | /* We always ignore unformed modules. */ |
3660 | if (mod->state == MODULE_STATE_UNFORMED) |
3661 | return 0; |
3662 | |
3663 | seq_printf(m, "%s %u", |
3664 | mod->name, mod->init_size + mod->core_size); |
3665 | print_unload_info(m, mod); |
3666 | |
3667 | /* Informative for users. */ |
3668 | seq_printf(m, " %s", |
3669 | mod->state == MODULE_STATE_GOING ? "Unloading": |
3670 | mod->state == MODULE_STATE_COMING ? "Loading": |
3671 | "Live"); |
3672 | /* Used by oprofile and other similar tools. */ |
3673 | seq_printf(m, " 0x%pK", mod->module_core); |
3674 | |
3675 | /* Taints info */ |
3676 | if (mod->taints) |
3677 | seq_printf(m, " %s", module_flags(mod, buf)); |
3678 | |
3679 | seq_printf(m, "\n"); |
3680 | return 0; |
3681 | } |
3682 | |
3683 | /* Format: modulename size refcount deps address |
3684 | |
3685 | Where refcount is a number or -, and deps is a comma-separated list |
3686 | of depends or -. |
3687 | */ |
3688 | static const struct seq_operations modules_op = { |
3689 | .start = m_start, |
3690 | .next = m_next, |
3691 | .stop = m_stop, |
3692 | .show = m_show |
3693 | }; |
3694 | |
3695 | static int modules_open(struct inode *inode, struct file *file) |
3696 | { |
3697 | return seq_open(file, &modules_op); |
3698 | } |
3699 | |
3700 | static const struct file_operations proc_modules_operations = { |
3701 | .open = modules_open, |
3702 | .read = seq_read, |
3703 | .llseek = seq_lseek, |
3704 | .release = seq_release, |
3705 | }; |
3706 | |
3707 | static int __init proc_modules_init(void) |
3708 | { |
3709 | proc_create("modules", 0, NULL, &proc_modules_operations); |
3710 | return 0; |
3711 | } |
3712 | module_init(proc_modules_init); |
3713 | #endif |
3714 | |
3715 | /* Given an address, look for it in the module exception tables. */ |
3716 | const struct exception_table_entry *search_module_extables(unsigned long addr) |
3717 | { |
3718 | const struct exception_table_entry *e = NULL; |
3719 | struct module *mod; |
3720 | |
3721 | preempt_disable(); |
3722 | list_for_each_entry_rcu(mod, &modules, list) { |
3723 | if (mod->state == MODULE_STATE_UNFORMED) |
3724 | continue; |
3725 | if (mod->num_exentries == 0) |
3726 | continue; |
3727 | |
3728 | e = search_extable(mod->extable, |
3729 | mod->extable + mod->num_exentries - 1, |
3730 | addr); |
3731 | if (e) |
3732 | break; |
3733 | } |
3734 | preempt_enable(); |
3735 | |
3736 | /* Now, if we found one, we are running inside it now, hence |
3737 | we cannot unload the module, hence no refcnt needed. */ |
3738 | return e; |
3739 | } |
3740 | |
3741 | /* |
3742 | * is_module_address - is this address inside a module? |
3743 | * @addr: the address to check. |
3744 | * |
3745 | * See is_module_text_address() if you simply want to see if the address |
3746 | * is code (not data). |
3747 | */ |
3748 | bool is_module_address(unsigned long addr) |
3749 | { |
3750 | bool ret; |
3751 | |
3752 | preempt_disable(); |
3753 | ret = __module_address(addr) != NULL; |
3754 | preempt_enable(); |
3755 | |
3756 | return ret; |
3757 | } |
3758 | |
3759 | /* |
3760 | * __module_address - get the module which contains an address. |
3761 | * @addr: the address. |
3762 | * |
3763 | * Must be called with preempt disabled or module mutex held so that |
3764 | * module doesn't get freed during this. |
3765 | */ |
3766 | struct module *__module_address(unsigned long addr) |
3767 | { |
3768 | struct module *mod; |
3769 | |
3770 | if (addr < module_addr_min || addr > module_addr_max) |
3771 | return NULL; |
3772 | |
3773 | list_for_each_entry_rcu(mod, &modules, list) { |
3774 | if (mod->state == MODULE_STATE_UNFORMED) |
3775 | continue; |
3776 | if (within_module_core(addr, mod) |
3777 | || within_module_init(addr, mod)) |
3778 | return mod; |
3779 | } |
3780 | return NULL; |
3781 | } |
3782 | EXPORT_SYMBOL_GPL(__module_address); |
3783 | |
3784 | /* |
3785 | * is_module_text_address - is this address inside module code? |
3786 | * @addr: the address to check. |
3787 | * |
3788 | * See is_module_address() if you simply want to see if the address is |
3789 | * anywhere in a module. See kernel_text_address() for testing if an |
3790 | * address corresponds to kernel or module code. |
3791 | */ |
3792 | bool is_module_text_address(unsigned long addr) |
3793 | { |
3794 | bool ret; |
3795 | |
3796 | preempt_disable(); |
3797 | ret = __module_text_address(addr) != NULL; |
3798 | preempt_enable(); |
3799 | |
3800 | return ret; |
3801 | } |
3802 | |
3803 | /* |
3804 | * __module_text_address - get the module whose code contains an address. |
3805 | * @addr: the address. |
3806 | * |
3807 | * Must be called with preempt disabled or module mutex held so that |
3808 | * module doesn't get freed during this. |
3809 | */ |
3810 | struct module *__module_text_address(unsigned long addr) |
3811 | { |
3812 | struct module *mod = __module_address(addr); |
3813 | if (mod) { |
3814 | /* Make sure it's within the text section. */ |
3815 | if (!within(addr, mod->module_init, mod->init_text_size) |
3816 | && !within(addr, mod->module_core, mod->core_text_size)) |
3817 | mod = NULL; |
3818 | } |
3819 | return mod; |
3820 | } |
3821 | EXPORT_SYMBOL_GPL(__module_text_address); |
3822 | |
3823 | /* Don't grab lock, we're oopsing. */ |
3824 | void print_modules(void) |
3825 | { |
3826 | struct module *mod; |
3827 | char buf[8]; |
3828 | |
3829 | printk(KERN_DEFAULT "Modules linked in:"); |
3830 | /* Most callers should already have preempt disabled, but make sure */ |
3831 | preempt_disable(); |
3832 | list_for_each_entry_rcu(mod, &modules, list) { |
3833 | if (mod->state == MODULE_STATE_UNFORMED) |
3834 | continue; |
3835 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
3836 | } |
3837 | preempt_enable(); |
3838 | if (last_unloaded_module[0]) |
3839 | printk(" [last unloaded: %s]", last_unloaded_module); |
3840 | printk("\n"); |
3841 | } |
3842 | |
3843 | #ifdef CONFIG_MODVERSIONS |
3844 | /* Generate the signature for all relevant module structures here. |
3845 | * If these change, we don't want to try to parse the module. */ |
3846 | void module_layout(struct module *mod, |
3847 | struct modversion_info *ver, |
3848 | struct kernel_param *kp, |
3849 | struct kernel_symbol *ks, |
3850 | struct tracepoint * const *tp) |
3851 | { |
3852 | } |
3853 | EXPORT_SYMBOL(module_layout); |
3854 | #endif |
3855 |
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