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1 | /* |
2 | Copyright (C) 2002 Richard Henderson |
3 | Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. |
4 | |
5 | This program is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
9 | |
10 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
19 | #include <linux/module.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/fs.h> |
25 | #include <linux/sysfs.h> |
26 | #include <linux/kernel.h> |
27 | #include <linux/slab.h> |
28 | #include <linux/vmalloc.h> |
29 | #include <linux/elf.h> |
30 | #include <linux/proc_fs.h> |
31 | #include <linux/seq_file.h> |
32 | #include <linux/syscalls.h> |
33 | #include <linux/fcntl.h> |
34 | #include <linux/rcupdate.h> |
35 | #include <linux/capability.h> |
36 | #include <linux/cpu.h> |
37 | #include <linux/moduleparam.h> |
38 | #include <linux/errno.h> |
39 | #include <linux/err.h> |
40 | #include <linux/vermagic.h> |
41 | #include <linux/notifier.h> |
42 | #include <linux/sched.h> |
43 | #include <linux/stop_machine.h> |
44 | #include <linux/device.h> |
45 | #include <linux/string.h> |
46 | #include <linux/mutex.h> |
47 | #include <linux/rculist.h> |
48 | #include <asm/uaccess.h> |
49 | #include <asm/cacheflush.h> |
50 | #include <asm/mmu_context.h> |
51 | #include <linux/license.h> |
52 | #include <asm/sections.h> |
53 | #include <linux/tracepoint.h> |
54 | #include <linux/ftrace.h> |
55 | #include <linux/async.h> |
56 | #include <linux/percpu.h> |
57 | #include <linux/kmemleak.h> |
58 | |
59 | #define CREATE_TRACE_POINTS |
60 | #include <trace/events/module.h> |
61 | |
62 | EXPORT_TRACEPOINT_SYMBOL(module_get); |
63 | |
64 | #if 0 |
65 | #define DEBUGP printk |
66 | #else |
67 | #define DEBUGP(fmt , a...) |
68 | #endif |
69 | |
70 | #ifndef ARCH_SHF_SMALL |
71 | #define ARCH_SHF_SMALL 0 |
72 | #endif |
73 | |
74 | /* If this is set, the section belongs in the init part of the module */ |
75 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
76 | |
77 | /* List of modules, protected by module_mutex or preempt_disable |
78 | * (delete uses stop_machine/add uses RCU list operations). */ |
79 | DEFINE_MUTEX(module_mutex); |
80 | EXPORT_SYMBOL_GPL(module_mutex); |
81 | static LIST_HEAD(modules); |
82 | |
83 | /* Block module loading/unloading? */ |
84 | int modules_disabled = 0; |
85 | |
86 | /* Waiting for a module to finish initializing? */ |
87 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
88 | |
89 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
90 | |
91 | /* Bounds of module allocation, for speeding __module_address */ |
92 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
93 | |
94 | int register_module_notifier(struct notifier_block * nb) |
95 | { |
96 | return blocking_notifier_chain_register(&module_notify_list, nb); |
97 | } |
98 | EXPORT_SYMBOL(register_module_notifier); |
99 | |
100 | int unregister_module_notifier(struct notifier_block * nb) |
101 | { |
102 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
103 | } |
104 | EXPORT_SYMBOL(unregister_module_notifier); |
105 | |
106 | /* We require a truly strong try_module_get(): 0 means failure due to |
107 | ongoing or failed initialization etc. */ |
108 | static inline int strong_try_module_get(struct module *mod) |
109 | { |
110 | if (mod && mod->state == MODULE_STATE_COMING) |
111 | return -EBUSY; |
112 | if (try_module_get(mod)) |
113 | return 0; |
114 | else |
115 | return -ENOENT; |
116 | } |
117 | |
118 | static inline void add_taint_module(struct module *mod, unsigned flag) |
119 | { |
120 | add_taint(flag); |
121 | mod->taints |= (1U << flag); |
122 | } |
123 | |
124 | /* |
125 | * A thread that wants to hold a reference to a module only while it |
126 | * is running can call this to safely exit. nfsd and lockd use this. |
127 | */ |
128 | void __module_put_and_exit(struct module *mod, long code) |
129 | { |
130 | module_put(mod); |
131 | do_exit(code); |
132 | } |
133 | EXPORT_SYMBOL(__module_put_and_exit); |
134 | |
135 | /* Find a module section: 0 means not found. */ |
136 | static unsigned int find_sec(Elf_Ehdr *hdr, |
137 | Elf_Shdr *sechdrs, |
138 | const char *secstrings, |
139 | const char *name) |
140 | { |
141 | unsigned int i; |
142 | |
143 | for (i = 1; i < hdr->e_shnum; i++) |
144 | /* Alloc bit cleared means "ignore it." */ |
145 | if ((sechdrs[i].sh_flags & SHF_ALLOC) |
146 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) |
147 | return i; |
148 | return 0; |
149 | } |
150 | |
151 | /* Find a module section, or NULL. */ |
152 | static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs, |
153 | const char *secstrings, const char *name) |
154 | { |
155 | /* Section 0 has sh_addr 0. */ |
156 | return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr; |
157 | } |
158 | |
159 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ |
160 | static void *section_objs(Elf_Ehdr *hdr, |
161 | Elf_Shdr *sechdrs, |
162 | const char *secstrings, |
163 | const char *name, |
164 | size_t object_size, |
165 | unsigned int *num) |
166 | { |
167 | unsigned int sec = find_sec(hdr, sechdrs, secstrings, name); |
168 | |
169 | /* Section 0 has sh_addr 0 and sh_size 0. */ |
170 | *num = sechdrs[sec].sh_size / object_size; |
171 | return (void *)sechdrs[sec].sh_addr; |
172 | } |
173 | |
174 | /* Provided by the linker */ |
175 | extern const struct kernel_symbol __start___ksymtab[]; |
176 | extern const struct kernel_symbol __stop___ksymtab[]; |
177 | extern const struct kernel_symbol __start___ksymtab_gpl[]; |
178 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
179 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
180 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
181 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
182 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
183 | extern const unsigned long __start___kcrctab[]; |
184 | extern const unsigned long __start___kcrctab_gpl[]; |
185 | extern const unsigned long __start___kcrctab_gpl_future[]; |
186 | #ifdef CONFIG_UNUSED_SYMBOLS |
187 | extern const struct kernel_symbol __start___ksymtab_unused[]; |
188 | extern const struct kernel_symbol __stop___ksymtab_unused[]; |
189 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; |
190 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; |
191 | extern const unsigned long __start___kcrctab_unused[]; |
192 | extern const unsigned long __start___kcrctab_unused_gpl[]; |
193 | #endif |
194 | |
195 | #ifndef CONFIG_MODVERSIONS |
196 | #define symversion(base, idx) NULL |
197 | #else |
198 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
199 | #endif |
200 | |
201 | static bool each_symbol_in_section(const struct symsearch *arr, |
202 | unsigned int arrsize, |
203 | struct module *owner, |
204 | bool (*fn)(const struct symsearch *syms, |
205 | struct module *owner, |
206 | unsigned int symnum, void *data), |
207 | void *data) |
208 | { |
209 | unsigned int i, j; |
210 | |
211 | for (j = 0; j < arrsize; j++) { |
212 | for (i = 0; i < arr[j].stop - arr[j].start; i++) |
213 | if (fn(&arr[j], owner, i, data)) |
214 | return true; |
215 | } |
216 | |
217 | return false; |
218 | } |
219 | |
220 | /* Returns true as soon as fn returns true, otherwise false. */ |
221 | bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner, |
222 | unsigned int symnum, void *data), void *data) |
223 | { |
224 | struct module *mod; |
225 | const struct symsearch arr[] = { |
226 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
227 | NOT_GPL_ONLY, false }, |
228 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
229 | __start___kcrctab_gpl, |
230 | GPL_ONLY, false }, |
231 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
232 | __start___kcrctab_gpl_future, |
233 | WILL_BE_GPL_ONLY, false }, |
234 | #ifdef CONFIG_UNUSED_SYMBOLS |
235 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
236 | __start___kcrctab_unused, |
237 | NOT_GPL_ONLY, true }, |
238 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
239 | __start___kcrctab_unused_gpl, |
240 | GPL_ONLY, true }, |
241 | #endif |
242 | }; |
243 | |
244 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
245 | return true; |
246 | |
247 | list_for_each_entry_rcu(mod, &modules, list) { |
248 | struct symsearch arr[] = { |
249 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, |
250 | NOT_GPL_ONLY, false }, |
251 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
252 | mod->gpl_crcs, |
253 | GPL_ONLY, false }, |
254 | { mod->gpl_future_syms, |
255 | mod->gpl_future_syms + mod->num_gpl_future_syms, |
256 | mod->gpl_future_crcs, |
257 | WILL_BE_GPL_ONLY, false }, |
258 | #ifdef CONFIG_UNUSED_SYMBOLS |
259 | { mod->unused_syms, |
260 | mod->unused_syms + mod->num_unused_syms, |
261 | mod->unused_crcs, |
262 | NOT_GPL_ONLY, true }, |
263 | { mod->unused_gpl_syms, |
264 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, |
265 | mod->unused_gpl_crcs, |
266 | GPL_ONLY, true }, |
267 | #endif |
268 | }; |
269 | |
270 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
271 | return true; |
272 | } |
273 | return false; |
274 | } |
275 | EXPORT_SYMBOL_GPL(each_symbol); |
276 | |
277 | struct find_symbol_arg { |
278 | /* Input */ |
279 | const char *name; |
280 | bool gplok; |
281 | bool warn; |
282 | |
283 | /* Output */ |
284 | struct module *owner; |
285 | const unsigned long *crc; |
286 | const struct kernel_symbol *sym; |
287 | }; |
288 | |
289 | static bool find_symbol_in_section(const struct symsearch *syms, |
290 | struct module *owner, |
291 | unsigned int symnum, void *data) |
292 | { |
293 | struct find_symbol_arg *fsa = data; |
294 | |
295 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) |
296 | return false; |
297 | |
298 | if (!fsa->gplok) { |
299 | if (syms->licence == GPL_ONLY) |
300 | return false; |
301 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { |
302 | printk(KERN_WARNING "Symbol %s is being used " |
303 | "by a non-GPL module, which will not " |
304 | "be allowed in the future\n", fsa->name); |
305 | printk(KERN_WARNING "Please see the file " |
306 | "Documentation/feature-removal-schedule.txt " |
307 | "in the kernel source tree for more details.\n"); |
308 | } |
309 | } |
310 | |
311 | #ifdef CONFIG_UNUSED_SYMBOLS |
312 | if (syms->unused && fsa->warn) { |
313 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " |
314 | "however this module is using it.\n", fsa->name); |
315 | printk(KERN_WARNING |
316 | "This symbol will go away in the future.\n"); |
317 | printk(KERN_WARNING |
318 | "Please evalute if this is the right api to use and if " |
319 | "it really is, submit a report the linux kernel " |
320 | "mailinglist together with submitting your code for " |
321 | "inclusion.\n"); |
322 | } |
323 | #endif |
324 | |
325 | fsa->owner = owner; |
326 | fsa->crc = symversion(syms->crcs, symnum); |
327 | fsa->sym = &syms->start[symnum]; |
328 | return true; |
329 | } |
330 | |
331 | /* Find a symbol and return it, along with, (optional) crc and |
332 | * (optional) module which owns it */ |
333 | const struct kernel_symbol *find_symbol(const char *name, |
334 | struct module **owner, |
335 | const unsigned long **crc, |
336 | bool gplok, |
337 | bool warn) |
338 | { |
339 | struct find_symbol_arg fsa; |
340 | |
341 | fsa.name = name; |
342 | fsa.gplok = gplok; |
343 | fsa.warn = warn; |
344 | |
345 | if (each_symbol(find_symbol_in_section, &fsa)) { |
346 | if (owner) |
347 | *owner = fsa.owner; |
348 | if (crc) |
349 | *crc = fsa.crc; |
350 | return fsa.sym; |
351 | } |
352 | |
353 | DEBUGP("Failed to find symbol %s\n", name); |
354 | return NULL; |
355 | } |
356 | EXPORT_SYMBOL_GPL(find_symbol); |
357 | |
358 | /* Search for module by name: must hold module_mutex. */ |
359 | struct module *find_module(const char *name) |
360 | { |
361 | struct module *mod; |
362 | |
363 | list_for_each_entry(mod, &modules, list) { |
364 | if (strcmp(mod->name, name) == 0) |
365 | return mod; |
366 | } |
367 | return NULL; |
368 | } |
369 | EXPORT_SYMBOL_GPL(find_module); |
370 | |
371 | #ifdef CONFIG_SMP |
372 | |
373 | #ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA |
374 | |
375 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
376 | const char *name) |
377 | { |
378 | void *ptr; |
379 | |
380 | if (align > PAGE_SIZE) { |
381 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", |
382 | name, align, PAGE_SIZE); |
383 | align = PAGE_SIZE; |
384 | } |
385 | |
386 | ptr = __alloc_reserved_percpu(size, align); |
387 | if (!ptr) |
388 | printk(KERN_WARNING |
389 | "Could not allocate %lu bytes percpu data\n", size); |
390 | return ptr; |
391 | } |
392 | |
393 | static void percpu_modfree(void *freeme) |
394 | { |
395 | free_percpu(freeme); |
396 | } |
397 | |
398 | #else /* ... CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
399 | |
400 | /* Number of blocks used and allocated. */ |
401 | static unsigned int pcpu_num_used, pcpu_num_allocated; |
402 | /* Size of each block. -ve means used. */ |
403 | static int *pcpu_size; |
404 | |
405 | static int split_block(unsigned int i, unsigned short size) |
406 | { |
407 | /* Reallocation required? */ |
408 | if (pcpu_num_used + 1 > pcpu_num_allocated) { |
409 | int *new; |
410 | |
411 | new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, |
412 | GFP_KERNEL); |
413 | if (!new) |
414 | return 0; |
415 | |
416 | pcpu_num_allocated *= 2; |
417 | pcpu_size = new; |
418 | } |
419 | |
420 | /* Insert a new subblock */ |
421 | memmove(&pcpu_size[i+1], &pcpu_size[i], |
422 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); |
423 | pcpu_num_used++; |
424 | |
425 | pcpu_size[i+1] -= size; |
426 | pcpu_size[i] = size; |
427 | return 1; |
428 | } |
429 | |
430 | static inline unsigned int block_size(int val) |
431 | { |
432 | if (val < 0) |
433 | return -val; |
434 | return val; |
435 | } |
436 | |
437 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
438 | const char *name) |
439 | { |
440 | unsigned long extra; |
441 | unsigned int i; |
442 | void *ptr; |
443 | int cpu; |
444 | |
445 | if (align > PAGE_SIZE) { |
446 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", |
447 | name, align, PAGE_SIZE); |
448 | align = PAGE_SIZE; |
449 | } |
450 | |
451 | ptr = __per_cpu_start; |
452 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { |
453 | /* Extra for alignment requirement. */ |
454 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; |
455 | BUG_ON(i == 0 && extra != 0); |
456 | |
457 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) |
458 | continue; |
459 | |
460 | /* Transfer extra to previous block. */ |
461 | if (pcpu_size[i-1] < 0) |
462 | pcpu_size[i-1] -= extra; |
463 | else |
464 | pcpu_size[i-1] += extra; |
465 | pcpu_size[i] -= extra; |
466 | ptr += extra; |
467 | |
468 | /* Split block if warranted */ |
469 | if (pcpu_size[i] - size > sizeof(unsigned long)) |
470 | if (!split_block(i, size)) |
471 | return NULL; |
472 | |
473 | /* add the per-cpu scanning areas */ |
474 | for_each_possible_cpu(cpu) |
475 | kmemleak_alloc(ptr + per_cpu_offset(cpu), size, 0, |
476 | GFP_KERNEL); |
477 | |
478 | /* Mark allocated */ |
479 | pcpu_size[i] = -pcpu_size[i]; |
480 | return ptr; |
481 | } |
482 | |
483 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", |
484 | size); |
485 | return NULL; |
486 | } |
487 | |
488 | static void percpu_modfree(void *freeme) |
489 | { |
490 | unsigned int i; |
491 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); |
492 | int cpu; |
493 | |
494 | /* First entry is core kernel percpu data. */ |
495 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { |
496 | if (ptr == freeme) { |
497 | pcpu_size[i] = -pcpu_size[i]; |
498 | goto free; |
499 | } |
500 | } |
501 | BUG(); |
502 | |
503 | free: |
504 | /* remove the per-cpu scanning areas */ |
505 | for_each_possible_cpu(cpu) |
506 | kmemleak_free(freeme + per_cpu_offset(cpu)); |
507 | |
508 | /* Merge with previous? */ |
509 | if (pcpu_size[i-1] >= 0) { |
510 | pcpu_size[i-1] += pcpu_size[i]; |
511 | pcpu_num_used--; |
512 | memmove(&pcpu_size[i], &pcpu_size[i+1], |
513 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); |
514 | i--; |
515 | } |
516 | /* Merge with next? */ |
517 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { |
518 | pcpu_size[i] += pcpu_size[i+1]; |
519 | pcpu_num_used--; |
520 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], |
521 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); |
522 | } |
523 | } |
524 | |
525 | static int percpu_modinit(void) |
526 | { |
527 | pcpu_num_used = 2; |
528 | pcpu_num_allocated = 2; |
529 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, |
530 | GFP_KERNEL); |
531 | /* Static in-kernel percpu data (used). */ |
532 | pcpu_size[0] = -(__per_cpu_end-__per_cpu_start); |
533 | /* Free room. */ |
534 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; |
535 | if (pcpu_size[1] < 0) { |
536 | printk(KERN_ERR "No per-cpu room for modules.\n"); |
537 | pcpu_num_used = 1; |
538 | } |
539 | |
540 | return 0; |
541 | } |
542 | __initcall(percpu_modinit); |
543 | |
544 | #endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
545 | |
546 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, |
547 | Elf_Shdr *sechdrs, |
548 | const char *secstrings) |
549 | { |
550 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); |
551 | } |
552 | |
553 | static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size) |
554 | { |
555 | int cpu; |
556 | |
557 | for_each_possible_cpu(cpu) |
558 | memcpy(pcpudest + per_cpu_offset(cpu), from, size); |
559 | } |
560 | |
561 | #else /* ... !CONFIG_SMP */ |
562 | |
563 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
564 | const char *name) |
565 | { |
566 | return NULL; |
567 | } |
568 | static inline void percpu_modfree(void *pcpuptr) |
569 | { |
570 | BUG(); |
571 | } |
572 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, |
573 | Elf_Shdr *sechdrs, |
574 | const char *secstrings) |
575 | { |
576 | return 0; |
577 | } |
578 | static inline void percpu_modcopy(void *pcpudst, const void *src, |
579 | unsigned long size) |
580 | { |
581 | /* pcpusec should be 0, and size of that section should be 0. */ |
582 | BUG_ON(size != 0); |
583 | } |
584 | |
585 | #endif /* CONFIG_SMP */ |
586 | |
587 | #define MODINFO_ATTR(field) \ |
588 | static void setup_modinfo_##field(struct module *mod, const char *s) \ |
589 | { \ |
590 | mod->field = kstrdup(s, GFP_KERNEL); \ |
591 | } \ |
592 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ |
593 | struct module *mod, char *buffer) \ |
594 | { \ |
595 | return sprintf(buffer, "%s\n", mod->field); \ |
596 | } \ |
597 | static int modinfo_##field##_exists(struct module *mod) \ |
598 | { \ |
599 | return mod->field != NULL; \ |
600 | } \ |
601 | static void free_modinfo_##field(struct module *mod) \ |
602 | { \ |
603 | kfree(mod->field); \ |
604 | mod->field = NULL; \ |
605 | } \ |
606 | static struct module_attribute modinfo_##field = { \ |
607 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
608 | .show = show_modinfo_##field, \ |
609 | .setup = setup_modinfo_##field, \ |
610 | .test = modinfo_##field##_exists, \ |
611 | .free = free_modinfo_##field, \ |
612 | }; |
613 | |
614 | MODINFO_ATTR(version); |
615 | MODINFO_ATTR(srcversion); |
616 | |
617 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
618 | |
619 | #ifdef CONFIG_MODULE_UNLOAD |
620 | /* Init the unload section of the module. */ |
621 | static void module_unload_init(struct module *mod) |
622 | { |
623 | int cpu; |
624 | |
625 | INIT_LIST_HEAD(&mod->modules_which_use_me); |
626 | for_each_possible_cpu(cpu) |
627 | local_set(__module_ref_addr(mod, cpu), 0); |
628 | /* Hold reference count during initialization. */ |
629 | local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1); |
630 | /* Backwards compatibility macros put refcount during init. */ |
631 | mod->waiter = current; |
632 | } |
633 | |
634 | /* modules using other modules */ |
635 | struct module_use |
636 | { |
637 | struct list_head list; |
638 | struct module *module_which_uses; |
639 | }; |
640 | |
641 | /* Does a already use b? */ |
642 | static int already_uses(struct module *a, struct module *b) |
643 | { |
644 | struct module_use *use; |
645 | |
646 | list_for_each_entry(use, &b->modules_which_use_me, list) { |
647 | if (use->module_which_uses == a) { |
648 | DEBUGP("%s uses %s!\n", a->name, b->name); |
649 | return 1; |
650 | } |
651 | } |
652 | DEBUGP("%s does not use %s!\n", a->name, b->name); |
653 | return 0; |
654 | } |
655 | |
656 | /* Module a uses b */ |
657 | int use_module(struct module *a, struct module *b) |
658 | { |
659 | struct module_use *use; |
660 | int no_warn, err; |
661 | |
662 | if (b == NULL || already_uses(a, b)) return 1; |
663 | |
664 | /* If we're interrupted or time out, we fail. */ |
665 | if (wait_event_interruptible_timeout( |
666 | module_wq, (err = strong_try_module_get(b)) != -EBUSY, |
667 | 30 * HZ) <= 0) { |
668 | printk("%s: gave up waiting for init of module %s.\n", |
669 | a->name, b->name); |
670 | return 0; |
671 | } |
672 | |
673 | /* If strong_try_module_get() returned a different error, we fail. */ |
674 | if (err) |
675 | return 0; |
676 | |
677 | DEBUGP("Allocating new usage for %s.\n", a->name); |
678 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
679 | if (!use) { |
680 | printk("%s: out of memory loading\n", a->name); |
681 | module_put(b); |
682 | return 0; |
683 | } |
684 | |
685 | use->module_which_uses = a; |
686 | list_add(&use->list, &b->modules_which_use_me); |
687 | no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
688 | return 1; |
689 | } |
690 | EXPORT_SYMBOL_GPL(use_module); |
691 | |
692 | /* Clear the unload stuff of the module. */ |
693 | static void module_unload_free(struct module *mod) |
694 | { |
695 | struct module *i; |
696 | |
697 | list_for_each_entry(i, &modules, list) { |
698 | struct module_use *use; |
699 | |
700 | list_for_each_entry(use, &i->modules_which_use_me, list) { |
701 | if (use->module_which_uses == mod) { |
702 | DEBUGP("%s unusing %s\n", mod->name, i->name); |
703 | module_put(i); |
704 | list_del(&use->list); |
705 | kfree(use); |
706 | sysfs_remove_link(i->holders_dir, mod->name); |
707 | /* There can be at most one match. */ |
708 | break; |
709 | } |
710 | } |
711 | } |
712 | } |
713 | |
714 | #ifdef CONFIG_MODULE_FORCE_UNLOAD |
715 | static inline int try_force_unload(unsigned int flags) |
716 | { |
717 | int ret = (flags & O_TRUNC); |
718 | if (ret) |
719 | add_taint(TAINT_FORCED_RMMOD); |
720 | return ret; |
721 | } |
722 | #else |
723 | static inline int try_force_unload(unsigned int flags) |
724 | { |
725 | return 0; |
726 | } |
727 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ |
728 | |
729 | struct stopref |
730 | { |
731 | struct module *mod; |
732 | int flags; |
733 | int *forced; |
734 | }; |
735 | |
736 | /* Whole machine is stopped with interrupts off when this runs. */ |
737 | static int __try_stop_module(void *_sref) |
738 | { |
739 | struct stopref *sref = _sref; |
740 | |
741 | /* If it's not unused, quit unless we're forcing. */ |
742 | if (module_refcount(sref->mod) != 0) { |
743 | if (!(*sref->forced = try_force_unload(sref->flags))) |
744 | return -EWOULDBLOCK; |
745 | } |
746 | |
747 | /* Mark it as dying. */ |
748 | sref->mod->state = MODULE_STATE_GOING; |
749 | return 0; |
750 | } |
751 | |
752 | static int try_stop_module(struct module *mod, int flags, int *forced) |
753 | { |
754 | if (flags & O_NONBLOCK) { |
755 | struct stopref sref = { mod, flags, forced }; |
756 | |
757 | return stop_machine(__try_stop_module, &sref, NULL); |
758 | } else { |
759 | /* We don't need to stop the machine for this. */ |
760 | mod->state = MODULE_STATE_GOING; |
761 | synchronize_sched(); |
762 | return 0; |
763 | } |
764 | } |
765 | |
766 | unsigned int module_refcount(struct module *mod) |
767 | { |
768 | unsigned int total = 0; |
769 | int cpu; |
770 | |
771 | for_each_possible_cpu(cpu) |
772 | total += local_read(__module_ref_addr(mod, cpu)); |
773 | return total; |
774 | } |
775 | EXPORT_SYMBOL(module_refcount); |
776 | |
777 | /* This exists whether we can unload or not */ |
778 | static void free_module(struct module *mod); |
779 | |
780 | static void wait_for_zero_refcount(struct module *mod) |
781 | { |
782 | /* Since we might sleep for some time, release the mutex first */ |
783 | mutex_unlock(&module_mutex); |
784 | for (;;) { |
785 | DEBUGP("Looking at refcount...\n"); |
786 | set_current_state(TASK_UNINTERRUPTIBLE); |
787 | if (module_refcount(mod) == 0) |
788 | break; |
789 | schedule(); |
790 | } |
791 | current->state = TASK_RUNNING; |
792 | mutex_lock(&module_mutex); |
793 | } |
794 | |
795 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
796 | unsigned int, flags) |
797 | { |
798 | struct module *mod; |
799 | char name[MODULE_NAME_LEN]; |
800 | int ret, forced = 0; |
801 | |
802 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
803 | return -EPERM; |
804 | |
805 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) |
806 | return -EFAULT; |
807 | name[MODULE_NAME_LEN-1] = '\0'; |
808 | |
809 | /* Create stop_machine threads since free_module relies on |
810 | * a non-failing stop_machine call. */ |
811 | ret = stop_machine_create(); |
812 | if (ret) |
813 | return ret; |
814 | |
815 | if (mutex_lock_interruptible(&module_mutex) != 0) { |
816 | ret = -EINTR; |
817 | goto out_stop; |
818 | } |
819 | |
820 | mod = find_module(name); |
821 | if (!mod) { |
822 | ret = -ENOENT; |
823 | goto out; |
824 | } |
825 | |
826 | if (!list_empty(&mod->modules_which_use_me)) { |
827 | /* Other modules depend on us: get rid of them first. */ |
828 | ret = -EWOULDBLOCK; |
829 | goto out; |
830 | } |
831 | |
832 | /* Doing init or already dying? */ |
833 | if (mod->state != MODULE_STATE_LIVE) { |
834 | /* FIXME: if (force), slam module count and wake up |
835 | waiter --RR */ |
836 | DEBUGP("%s already dying\n", mod->name); |
837 | ret = -EBUSY; |
838 | goto out; |
839 | } |
840 | |
841 | /* If it has an init func, it must have an exit func to unload */ |
842 | if (mod->init && !mod->exit) { |
843 | forced = try_force_unload(flags); |
844 | if (!forced) { |
845 | /* This module can't be removed */ |
846 | ret = -EBUSY; |
847 | goto out; |
848 | } |
849 | } |
850 | |
851 | /* Set this up before setting mod->state */ |
852 | mod->waiter = current; |
853 | |
854 | /* Stop the machine so refcounts can't move and disable module. */ |
855 | ret = try_stop_module(mod, flags, &forced); |
856 | if (ret != 0) |
857 | goto out; |
858 | |
859 | /* Never wait if forced. */ |
860 | if (!forced && module_refcount(mod) != 0) |
861 | wait_for_zero_refcount(mod); |
862 | |
863 | mutex_unlock(&module_mutex); |
864 | /* Final destruction now noone is using it. */ |
865 | if (mod->exit != NULL) |
866 | mod->exit(); |
867 | blocking_notifier_call_chain(&module_notify_list, |
868 | MODULE_STATE_GOING, mod); |
869 | async_synchronize_full(); |
870 | mutex_lock(&module_mutex); |
871 | /* Store the name of the last unloaded module for diagnostic purposes */ |
872 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
873 | ddebug_remove_module(mod->name); |
874 | free_module(mod); |
875 | |
876 | out: |
877 | mutex_unlock(&module_mutex); |
878 | out_stop: |
879 | stop_machine_destroy(); |
880 | return ret; |
881 | } |
882 | |
883 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
884 | { |
885 | struct module_use *use; |
886 | int printed_something = 0; |
887 | |
888 | seq_printf(m, " %u ", module_refcount(mod)); |
889 | |
890 | /* Always include a trailing , so userspace can differentiate |
891 | between this and the old multi-field proc format. */ |
892 | list_for_each_entry(use, &mod->modules_which_use_me, list) { |
893 | printed_something = 1; |
894 | seq_printf(m, "%s,", use->module_which_uses->name); |
895 | } |
896 | |
897 | if (mod->init != NULL && mod->exit == NULL) { |
898 | printed_something = 1; |
899 | seq_printf(m, "[permanent],"); |
900 | } |
901 | |
902 | if (!printed_something) |
903 | seq_printf(m, "-"); |
904 | } |
905 | |
906 | void __symbol_put(const char *symbol) |
907 | { |
908 | struct module *owner; |
909 | |
910 | preempt_disable(); |
911 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
912 | BUG(); |
913 | module_put(owner); |
914 | preempt_enable(); |
915 | } |
916 | EXPORT_SYMBOL(__symbol_put); |
917 | |
918 | /* Note this assumes addr is a function, which it currently always is. */ |
919 | void symbol_put_addr(void *addr) |
920 | { |
921 | struct module *modaddr; |
922 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
923 | |
924 | if (core_kernel_text(a)) |
925 | return; |
926 | |
927 | /* module_text_address is safe here: we're supposed to have reference |
928 | * to module from symbol_get, so it can't go away. */ |
929 | modaddr = __module_text_address(a); |
930 | BUG_ON(!modaddr); |
931 | module_put(modaddr); |
932 | } |
933 | EXPORT_SYMBOL_GPL(symbol_put_addr); |
934 | |
935 | static ssize_t show_refcnt(struct module_attribute *mattr, |
936 | struct module *mod, char *buffer) |
937 | { |
938 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
939 | } |
940 | |
941 | static struct module_attribute refcnt = { |
942 | .attr = { .name = "refcnt", .mode = 0444 }, |
943 | .show = show_refcnt, |
944 | }; |
945 | |
946 | void module_put(struct module *module) |
947 | { |
948 | if (module) { |
949 | unsigned int cpu = get_cpu(); |
950 | local_dec(__module_ref_addr(module, cpu)); |
951 | trace_module_put(module, _RET_IP_, |
952 | local_read(__module_ref_addr(module, cpu))); |
953 | /* Maybe they're waiting for us to drop reference? */ |
954 | if (unlikely(!module_is_live(module))) |
955 | wake_up_process(module->waiter); |
956 | put_cpu(); |
957 | } |
958 | } |
959 | EXPORT_SYMBOL(module_put); |
960 | |
961 | #else /* !CONFIG_MODULE_UNLOAD */ |
962 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
963 | { |
964 | /* We don't know the usage count, or what modules are using. */ |
965 | seq_printf(m, " - -"); |
966 | } |
967 | |
968 | static inline void module_unload_free(struct module *mod) |
969 | { |
970 | } |
971 | |
972 | int use_module(struct module *a, struct module *b) |
973 | { |
974 | return strong_try_module_get(b) == 0; |
975 | } |
976 | EXPORT_SYMBOL_GPL(use_module); |
977 | |
978 | static inline void module_unload_init(struct module *mod) |
979 | { |
980 | } |
981 | #endif /* CONFIG_MODULE_UNLOAD */ |
982 | |
983 | static ssize_t show_initstate(struct module_attribute *mattr, |
984 | struct module *mod, char *buffer) |
985 | { |
986 | const char *state = "unknown"; |
987 | |
988 | switch (mod->state) { |
989 | case MODULE_STATE_LIVE: |
990 | state = "live"; |
991 | break; |
992 | case MODULE_STATE_COMING: |
993 | state = "coming"; |
994 | break; |
995 | case MODULE_STATE_GOING: |
996 | state = "going"; |
997 | break; |
998 | } |
999 | return sprintf(buffer, "%s\n", state); |
1000 | } |
1001 | |
1002 | static struct module_attribute initstate = { |
1003 | .attr = { .name = "initstate", .mode = 0444 }, |
1004 | .show = show_initstate, |
1005 | }; |
1006 | |
1007 | static struct module_attribute *modinfo_attrs[] = { |
1008 | &modinfo_version, |
1009 | &modinfo_srcversion, |
1010 | &initstate, |
1011 | #ifdef CONFIG_MODULE_UNLOAD |
1012 | &refcnt, |
1013 | #endif |
1014 | NULL, |
1015 | }; |
1016 | |
1017 | static const char vermagic[] = VERMAGIC_STRING; |
1018 | |
1019 | static int try_to_force_load(struct module *mod, const char *reason) |
1020 | { |
1021 | #ifdef CONFIG_MODULE_FORCE_LOAD |
1022 | if (!test_taint(TAINT_FORCED_MODULE)) |
1023 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
1024 | mod->name, reason); |
1025 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1026 | return 0; |
1027 | #else |
1028 | return -ENOEXEC; |
1029 | #endif |
1030 | } |
1031 | |
1032 | #ifdef CONFIG_MODVERSIONS |
1033 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1034 | static unsigned long maybe_relocated(unsigned long crc, |
1035 | const struct module *crc_owner) |
1036 | { |
1037 | #ifdef ARCH_RELOCATES_KCRCTAB |
1038 | if (crc_owner == NULL) |
1039 | return crc - (unsigned long)reloc_start; |
1040 | #endif |
1041 | return crc; |
1042 | } |
1043 | |
1044 | static int check_version(Elf_Shdr *sechdrs, |
1045 | unsigned int versindex, |
1046 | const char *symname, |
1047 | struct module *mod, |
1048 | const unsigned long *crc, |
1049 | const struct module *crc_owner) |
1050 | { |
1051 | unsigned int i, num_versions; |
1052 | struct modversion_info *versions; |
1053 | |
1054 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ |
1055 | if (!crc) |
1056 | return 1; |
1057 | |
1058 | /* No versions at all? modprobe --force does this. */ |
1059 | if (versindex == 0) |
1060 | return try_to_force_load(mod, symname) == 0; |
1061 | |
1062 | versions = (void *) sechdrs[versindex].sh_addr; |
1063 | num_versions = sechdrs[versindex].sh_size |
1064 | / sizeof(struct modversion_info); |
1065 | |
1066 | for (i = 0; i < num_versions; i++) { |
1067 | if (strcmp(versions[i].name, symname) != 0) |
1068 | continue; |
1069 | |
1070 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1071 | return 1; |
1072 | DEBUGP("Found checksum %lX vs module %lX\n", |
1073 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
1074 | goto bad_version; |
1075 | } |
1076 | |
1077 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1078 | mod->name, symname); |
1079 | return 0; |
1080 | |
1081 | bad_version: |
1082 | printk("%s: disagrees about version of symbol %s\n", |
1083 | mod->name, symname); |
1084 | return 0; |
1085 | } |
1086 | |
1087 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
1088 | unsigned int versindex, |
1089 | struct module *mod) |
1090 | { |
1091 | const unsigned long *crc; |
1092 | |
1093 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
1094 | &crc, true, false)) |
1095 | BUG(); |
1096 | return check_version(sechdrs, versindex, "module_layout", mod, crc, |
1097 | NULL); |
1098 | } |
1099 | |
1100 | /* First part is kernel version, which we ignore if module has crcs. */ |
1101 | static inline int same_magic(const char *amagic, const char *bmagic, |
1102 | bool has_crcs) |
1103 | { |
1104 | if (has_crcs) { |
1105 | amagic += strcspn(amagic, " "); |
1106 | bmagic += strcspn(bmagic, " "); |
1107 | } |
1108 | return strcmp(amagic, bmagic) == 0; |
1109 | } |
1110 | #else |
1111 | static inline int check_version(Elf_Shdr *sechdrs, |
1112 | unsigned int versindex, |
1113 | const char *symname, |
1114 | struct module *mod, |
1115 | const unsigned long *crc, |
1116 | const struct module *crc_owner) |
1117 | { |
1118 | return 1; |
1119 | } |
1120 | |
1121 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
1122 | unsigned int versindex, |
1123 | struct module *mod) |
1124 | { |
1125 | return 1; |
1126 | } |
1127 | |
1128 | static inline int same_magic(const char *amagic, const char *bmagic, |
1129 | bool has_crcs) |
1130 | { |
1131 | return strcmp(amagic, bmagic) == 0; |
1132 | } |
1133 | #endif /* CONFIG_MODVERSIONS */ |
1134 | |
1135 | /* Resolve a symbol for this module. I.e. if we find one, record usage. |
1136 | Must be holding module_mutex. */ |
1137 | static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs, |
1138 | unsigned int versindex, |
1139 | const char *name, |
1140 | struct module *mod) |
1141 | { |
1142 | struct module *owner; |
1143 | const struct kernel_symbol *sym; |
1144 | const unsigned long *crc; |
1145 | |
1146 | sym = find_symbol(name, &owner, &crc, |
1147 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
1148 | /* use_module can fail due to OOM, |
1149 | or module initialization or unloading */ |
1150 | if (sym) { |
1151 | if (!check_version(sechdrs, versindex, name, mod, crc, owner) |
1152 | || !use_module(mod, owner)) |
1153 | sym = NULL; |
1154 | } |
1155 | return sym; |
1156 | } |
1157 | |
1158 | /* |
1159 | * /sys/module/foo/sections stuff |
1160 | * J. Corbet <corbet@lwn.net> |
1161 | */ |
1162 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
1163 | |
1164 | static inline bool sect_empty(const Elf_Shdr *sect) |
1165 | { |
1166 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; |
1167 | } |
1168 | |
1169 | struct module_sect_attr |
1170 | { |
1171 | struct module_attribute mattr; |
1172 | char *name; |
1173 | unsigned long address; |
1174 | }; |
1175 | |
1176 | struct module_sect_attrs |
1177 | { |
1178 | struct attribute_group grp; |
1179 | unsigned int nsections; |
1180 | struct module_sect_attr attrs[0]; |
1181 | }; |
1182 | |
1183 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1184 | struct module *mod, char *buf) |
1185 | { |
1186 | struct module_sect_attr *sattr = |
1187 | container_of(mattr, struct module_sect_attr, mattr); |
1188 | return sprintf(buf, "0x%lx\n", sattr->address); |
1189 | } |
1190 | |
1191 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1192 | { |
1193 | unsigned int section; |
1194 | |
1195 | for (section = 0; section < sect_attrs->nsections; section++) |
1196 | kfree(sect_attrs->attrs[section].name); |
1197 | kfree(sect_attrs); |
1198 | } |
1199 | |
1200 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1201 | char *secstrings, Elf_Shdr *sechdrs) |
1202 | { |
1203 | unsigned int nloaded = 0, i, size[2]; |
1204 | struct module_sect_attrs *sect_attrs; |
1205 | struct module_sect_attr *sattr; |
1206 | struct attribute **gattr; |
1207 | |
1208 | /* Count loaded sections and allocate structures */ |
1209 | for (i = 0; i < nsect; i++) |
1210 | if (!sect_empty(&sechdrs[i])) |
1211 | nloaded++; |
1212 | size[0] = ALIGN(sizeof(*sect_attrs) |
1213 | + nloaded * sizeof(sect_attrs->attrs[0]), |
1214 | sizeof(sect_attrs->grp.attrs[0])); |
1215 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); |
1216 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1217 | if (sect_attrs == NULL) |
1218 | return; |
1219 | |
1220 | /* Setup section attributes. */ |
1221 | sect_attrs->grp.name = "sections"; |
1222 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
1223 | |
1224 | sect_attrs->nsections = 0; |
1225 | sattr = §_attrs->attrs[0]; |
1226 | gattr = §_attrs->grp.attrs[0]; |
1227 | for (i = 0; i < nsect; i++) { |
1228 | if (sect_empty(&sechdrs[i])) |
1229 | continue; |
1230 | sattr->address = sechdrs[i].sh_addr; |
1231 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1232 | GFP_KERNEL); |
1233 | if (sattr->name == NULL) |
1234 | goto out; |
1235 | sect_attrs->nsections++; |
1236 | sattr->mattr.show = module_sect_show; |
1237 | sattr->mattr.store = NULL; |
1238 | sattr->mattr.attr.name = sattr->name; |
1239 | sattr->mattr.attr.mode = S_IRUGO; |
1240 | *(gattr++) = &(sattr++)->mattr.attr; |
1241 | } |
1242 | *gattr = NULL; |
1243 | |
1244 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) |
1245 | goto out; |
1246 | |
1247 | mod->sect_attrs = sect_attrs; |
1248 | return; |
1249 | out: |
1250 | free_sect_attrs(sect_attrs); |
1251 | } |
1252 | |
1253 | static void remove_sect_attrs(struct module *mod) |
1254 | { |
1255 | if (mod->sect_attrs) { |
1256 | sysfs_remove_group(&mod->mkobj.kobj, |
1257 | &mod->sect_attrs->grp); |
1258 | /* We are positive that no one is using any sect attrs |
1259 | * at this point. Deallocate immediately. */ |
1260 | free_sect_attrs(mod->sect_attrs); |
1261 | mod->sect_attrs = NULL; |
1262 | } |
1263 | } |
1264 | |
1265 | /* |
1266 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. |
1267 | */ |
1268 | |
1269 | struct module_notes_attrs { |
1270 | struct kobject *dir; |
1271 | unsigned int notes; |
1272 | struct bin_attribute attrs[0]; |
1273 | }; |
1274 | |
1275 | static ssize_t module_notes_read(struct kobject *kobj, |
1276 | struct bin_attribute *bin_attr, |
1277 | char *buf, loff_t pos, size_t count) |
1278 | { |
1279 | /* |
1280 | * The caller checked the pos and count against our size. |
1281 | */ |
1282 | memcpy(buf, bin_attr->private + pos, count); |
1283 | return count; |
1284 | } |
1285 | |
1286 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, |
1287 | unsigned int i) |
1288 | { |
1289 | if (notes_attrs->dir) { |
1290 | while (i-- > 0) |
1291 | sysfs_remove_bin_file(notes_attrs->dir, |
1292 | ¬es_attrs->attrs[i]); |
1293 | kobject_put(notes_attrs->dir); |
1294 | } |
1295 | kfree(notes_attrs); |
1296 | } |
1297 | |
1298 | static void add_notes_attrs(struct module *mod, unsigned int nsect, |
1299 | char *secstrings, Elf_Shdr *sechdrs) |
1300 | { |
1301 | unsigned int notes, loaded, i; |
1302 | struct module_notes_attrs *notes_attrs; |
1303 | struct bin_attribute *nattr; |
1304 | |
1305 | /* failed to create section attributes, so can't create notes */ |
1306 | if (!mod->sect_attrs) |
1307 | return; |
1308 | |
1309 | /* Count notes sections and allocate structures. */ |
1310 | notes = 0; |
1311 | for (i = 0; i < nsect; i++) |
1312 | if (!sect_empty(&sechdrs[i]) && |
1313 | (sechdrs[i].sh_type == SHT_NOTE)) |
1314 | ++notes; |
1315 | |
1316 | if (notes == 0) |
1317 | return; |
1318 | |
1319 | notes_attrs = kzalloc(sizeof(*notes_attrs) |
1320 | + notes * sizeof(notes_attrs->attrs[0]), |
1321 | GFP_KERNEL); |
1322 | if (notes_attrs == NULL) |
1323 | return; |
1324 | |
1325 | notes_attrs->notes = notes; |
1326 | nattr = ¬es_attrs->attrs[0]; |
1327 | for (loaded = i = 0; i < nsect; ++i) { |
1328 | if (sect_empty(&sechdrs[i])) |
1329 | continue; |
1330 | if (sechdrs[i].sh_type == SHT_NOTE) { |
1331 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1332 | nattr->attr.mode = S_IRUGO; |
1333 | nattr->size = sechdrs[i].sh_size; |
1334 | nattr->private = (void *) sechdrs[i].sh_addr; |
1335 | nattr->read = module_notes_read; |
1336 | ++nattr; |
1337 | } |
1338 | ++loaded; |
1339 | } |
1340 | |
1341 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
1342 | if (!notes_attrs->dir) |
1343 | goto out; |
1344 | |
1345 | for (i = 0; i < notes; ++i) |
1346 | if (sysfs_create_bin_file(notes_attrs->dir, |
1347 | ¬es_attrs->attrs[i])) |
1348 | goto out; |
1349 | |
1350 | mod->notes_attrs = notes_attrs; |
1351 | return; |
1352 | |
1353 | out: |
1354 | free_notes_attrs(notes_attrs, i); |
1355 | } |
1356 | |
1357 | static void remove_notes_attrs(struct module *mod) |
1358 | { |
1359 | if (mod->notes_attrs) |
1360 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); |
1361 | } |
1362 | |
1363 | #else |
1364 | |
1365 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1366 | char *sectstrings, Elf_Shdr *sechdrs) |
1367 | { |
1368 | } |
1369 | |
1370 | static inline void remove_sect_attrs(struct module *mod) |
1371 | { |
1372 | } |
1373 | |
1374 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, |
1375 | char *sectstrings, Elf_Shdr *sechdrs) |
1376 | { |
1377 | } |
1378 | |
1379 | static inline void remove_notes_attrs(struct module *mod) |
1380 | { |
1381 | } |
1382 | #endif |
1383 | |
1384 | #ifdef CONFIG_SYSFS |
1385 | int module_add_modinfo_attrs(struct module *mod) |
1386 | { |
1387 | struct module_attribute *attr; |
1388 | struct module_attribute *temp_attr; |
1389 | int error = 0; |
1390 | int i; |
1391 | |
1392 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1393 | (ARRAY_SIZE(modinfo_attrs) + 1)), |
1394 | GFP_KERNEL); |
1395 | if (!mod->modinfo_attrs) |
1396 | return -ENOMEM; |
1397 | |
1398 | temp_attr = mod->modinfo_attrs; |
1399 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1400 | if (!attr->test || |
1401 | (attr->test && attr->test(mod))) { |
1402 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
1403 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1404 | ++temp_attr; |
1405 | } |
1406 | } |
1407 | return error; |
1408 | } |
1409 | |
1410 | void module_remove_modinfo_attrs(struct module *mod) |
1411 | { |
1412 | struct module_attribute *attr; |
1413 | int i; |
1414 | |
1415 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1416 | /* pick a field to test for end of list */ |
1417 | if (!attr->attr.name) |
1418 | break; |
1419 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
1420 | if (attr->free) |
1421 | attr->free(mod); |
1422 | } |
1423 | kfree(mod->modinfo_attrs); |
1424 | } |
1425 | |
1426 | int mod_sysfs_init(struct module *mod) |
1427 | { |
1428 | int err; |
1429 | struct kobject *kobj; |
1430 | |
1431 | if (!module_sysfs_initialized) { |
1432 | printk(KERN_ERR "%s: module sysfs not initialized\n", |
1433 | mod->name); |
1434 | err = -EINVAL; |
1435 | goto out; |
1436 | } |
1437 | |
1438 | kobj = kset_find_obj(module_kset, mod->name); |
1439 | if (kobj) { |
1440 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); |
1441 | kobject_put(kobj); |
1442 | err = -EINVAL; |
1443 | goto out; |
1444 | } |
1445 | |
1446 | mod->mkobj.mod = mod; |
1447 | |
1448 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1449 | mod->mkobj.kobj.kset = module_kset; |
1450 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, |
1451 | "%s", mod->name); |
1452 | if (err) |
1453 | kobject_put(&mod->mkobj.kobj); |
1454 | |
1455 | /* delay uevent until full sysfs population */ |
1456 | out: |
1457 | return err; |
1458 | } |
1459 | |
1460 | int mod_sysfs_setup(struct module *mod, |
1461 | struct kernel_param *kparam, |
1462 | unsigned int num_params) |
1463 | { |
1464 | int err; |
1465 | |
1466 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
1467 | if (!mod->holders_dir) { |
1468 | err = -ENOMEM; |
1469 | goto out_unreg; |
1470 | } |
1471 | |
1472 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1473 | if (err) |
1474 | goto out_unreg_holders; |
1475 | |
1476 | err = module_add_modinfo_attrs(mod); |
1477 | if (err) |
1478 | goto out_unreg_param; |
1479 | |
1480 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1481 | return 0; |
1482 | |
1483 | out_unreg_param: |
1484 | module_param_sysfs_remove(mod); |
1485 | out_unreg_holders: |
1486 | kobject_put(mod->holders_dir); |
1487 | out_unreg: |
1488 | kobject_put(&mod->mkobj.kobj); |
1489 | return err; |
1490 | } |
1491 | |
1492 | static void mod_sysfs_fini(struct module *mod) |
1493 | { |
1494 | kobject_put(&mod->mkobj.kobj); |
1495 | } |
1496 | |
1497 | #else /* CONFIG_SYSFS */ |
1498 | |
1499 | static void mod_sysfs_fini(struct module *mod) |
1500 | { |
1501 | } |
1502 | |
1503 | #endif /* CONFIG_SYSFS */ |
1504 | |
1505 | static void mod_kobject_remove(struct module *mod) |
1506 | { |
1507 | module_remove_modinfo_attrs(mod); |
1508 | module_param_sysfs_remove(mod); |
1509 | kobject_put(mod->mkobj.drivers_dir); |
1510 | kobject_put(mod->holders_dir); |
1511 | mod_sysfs_fini(mod); |
1512 | } |
1513 | |
1514 | /* |
1515 | * unlink the module with the whole machine is stopped with interrupts off |
1516 | * - this defends against kallsyms not taking locks |
1517 | */ |
1518 | static int __unlink_module(void *_mod) |
1519 | { |
1520 | struct module *mod = _mod; |
1521 | list_del(&mod->list); |
1522 | return 0; |
1523 | } |
1524 | |
1525 | /* Free a module, remove from lists, etc (must hold module_mutex). */ |
1526 | static void free_module(struct module *mod) |
1527 | { |
1528 | trace_module_free(mod); |
1529 | |
1530 | /* Delete from various lists */ |
1531 | stop_machine(__unlink_module, mod, NULL); |
1532 | remove_notes_attrs(mod); |
1533 | remove_sect_attrs(mod); |
1534 | mod_kobject_remove(mod); |
1535 | |
1536 | /* Arch-specific cleanup. */ |
1537 | module_arch_cleanup(mod); |
1538 | |
1539 | /* Module unload stuff */ |
1540 | module_unload_free(mod); |
1541 | |
1542 | /* Free any allocated parameters. */ |
1543 | destroy_params(mod->kp, mod->num_kp); |
1544 | |
1545 | /* This may be NULL, but that's OK */ |
1546 | module_free(mod, mod->module_init); |
1547 | kfree(mod->args); |
1548 | if (mod->percpu) |
1549 | percpu_modfree(mod->percpu); |
1550 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
1551 | if (mod->refptr) |
1552 | percpu_modfree(mod->refptr); |
1553 | #endif |
1554 | /* Free lock-classes: */ |
1555 | lockdep_free_key_range(mod->module_core, mod->core_size); |
1556 | |
1557 | /* Finally, free the core (containing the module structure) */ |
1558 | module_free(mod, mod->module_core); |
1559 | |
1560 | #ifdef CONFIG_MPU |
1561 | update_protections(current->mm); |
1562 | #endif |
1563 | } |
1564 | |
1565 | void *__symbol_get(const char *symbol) |
1566 | { |
1567 | struct module *owner; |
1568 | const struct kernel_symbol *sym; |
1569 | |
1570 | preempt_disable(); |
1571 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1572 | if (sym && strong_try_module_get(owner)) |
1573 | sym = NULL; |
1574 | preempt_enable(); |
1575 | |
1576 | return sym ? (void *)sym->value : NULL; |
1577 | } |
1578 | EXPORT_SYMBOL_GPL(__symbol_get); |
1579 | |
1580 | /* |
1581 | * Ensure that an exported symbol [global namespace] does not already exist |
1582 | * in the kernel or in some other module's exported symbol table. |
1583 | */ |
1584 | static int verify_export_symbols(struct module *mod) |
1585 | { |
1586 | unsigned int i; |
1587 | struct module *owner; |
1588 | const struct kernel_symbol *s; |
1589 | struct { |
1590 | const struct kernel_symbol *sym; |
1591 | unsigned int num; |
1592 | } arr[] = { |
1593 | { mod->syms, mod->num_syms }, |
1594 | { mod->gpl_syms, mod->num_gpl_syms }, |
1595 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, |
1596 | #ifdef CONFIG_UNUSED_SYMBOLS |
1597 | { mod->unused_syms, mod->num_unused_syms }, |
1598 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, |
1599 | #endif |
1600 | }; |
1601 | |
1602 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1603 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { |
1604 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
1605 | printk(KERN_ERR |
1606 | "%s: exports duplicate symbol %s" |
1607 | " (owned by %s)\n", |
1608 | mod->name, s->name, module_name(owner)); |
1609 | return -ENOEXEC; |
1610 | } |
1611 | } |
1612 | } |
1613 | return 0; |
1614 | } |
1615 | |
1616 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1617 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1618 | unsigned int symindex, |
1619 | const char *strtab, |
1620 | unsigned int versindex, |
1621 | unsigned int pcpuindex, |
1622 | struct module *mod) |
1623 | { |
1624 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; |
1625 | unsigned long secbase; |
1626 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
1627 | int ret = 0; |
1628 | const struct kernel_symbol *ksym; |
1629 | |
1630 | for (i = 1; i < n; i++) { |
1631 | switch (sym[i].st_shndx) { |
1632 | case SHN_COMMON: |
1633 | /* We compiled with -fno-common. These are not |
1634 | supposed to happen. */ |
1635 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); |
1636 | printk("%s: please compile with -fno-common\n", |
1637 | mod->name); |
1638 | ret = -ENOEXEC; |
1639 | break; |
1640 | |
1641 | case SHN_ABS: |
1642 | /* Don't need to do anything */ |
1643 | DEBUGP("Absolute symbol: 0x%08lx\n", |
1644 | (long)sym[i].st_value); |
1645 | break; |
1646 | |
1647 | case SHN_UNDEF: |
1648 | ksym = resolve_symbol(sechdrs, versindex, |
1649 | strtab + sym[i].st_name, mod); |
1650 | /* Ok if resolved. */ |
1651 | if (ksym) { |
1652 | sym[i].st_value = ksym->value; |
1653 | break; |
1654 | } |
1655 | |
1656 | /* Ok if weak. */ |
1657 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1658 | break; |
1659 | |
1660 | printk(KERN_WARNING "%s: Unknown symbol %s\n", |
1661 | mod->name, strtab + sym[i].st_name); |
1662 | ret = -ENOENT; |
1663 | break; |
1664 | |
1665 | default: |
1666 | /* Divert to percpu allocation if a percpu var. */ |
1667 | if (sym[i].st_shndx == pcpuindex) |
1668 | secbase = (unsigned long)mod->percpu; |
1669 | else |
1670 | secbase = sechdrs[sym[i].st_shndx].sh_addr; |
1671 | sym[i].st_value += secbase; |
1672 | break; |
1673 | } |
1674 | } |
1675 | |
1676 | return ret; |
1677 | } |
1678 | |
1679 | /* Additional bytes needed by arch in front of individual sections */ |
1680 | unsigned int __weak arch_mod_section_prepend(struct module *mod, |
1681 | unsigned int section) |
1682 | { |
1683 | /* default implementation just returns zero */ |
1684 | return 0; |
1685 | } |
1686 | |
1687 | /* Update size with this section: return offset. */ |
1688 | static long get_offset(struct module *mod, unsigned int *size, |
1689 | Elf_Shdr *sechdr, unsigned int section) |
1690 | { |
1691 | long ret; |
1692 | |
1693 | *size += arch_mod_section_prepend(mod, section); |
1694 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1695 | *size = ret + sechdr->sh_size; |
1696 | return ret; |
1697 | } |
1698 | |
1699 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld |
1700 | might -- code, read-only data, read-write data, small data. Tally |
1701 | sizes, and place the offsets into sh_entsize fields: high bit means it |
1702 | belongs in init. */ |
1703 | static void layout_sections(struct module *mod, |
1704 | const Elf_Ehdr *hdr, |
1705 | Elf_Shdr *sechdrs, |
1706 | const char *secstrings) |
1707 | { |
1708 | static unsigned long const masks[][2] = { |
1709 | /* NOTE: all executable code must be the first section |
1710 | * in this array; otherwise modify the text_size |
1711 | * finder in the two loops below */ |
1712 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
1713 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, |
1714 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
1715 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } |
1716 | }; |
1717 | unsigned int m, i; |
1718 | |
1719 | for (i = 0; i < hdr->e_shnum; i++) |
1720 | sechdrs[i].sh_entsize = ~0UL; |
1721 | |
1722 | DEBUGP("Core section allocation order:\n"); |
1723 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
1724 | for (i = 0; i < hdr->e_shnum; ++i) { |
1725 | Elf_Shdr *s = &sechdrs[i]; |
1726 | |
1727 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
1728 | || (s->sh_flags & masks[m][1]) |
1729 | || s->sh_entsize != ~0UL |
1730 | || strstarts(secstrings + s->sh_name, ".init")) |
1731 | continue; |
1732 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
1733 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
1734 | } |
1735 | if (m == 0) |
1736 | mod->core_text_size = mod->core_size; |
1737 | } |
1738 | |
1739 | DEBUGP("Init section allocation order:\n"); |
1740 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
1741 | for (i = 0; i < hdr->e_shnum; ++i) { |
1742 | Elf_Shdr *s = &sechdrs[i]; |
1743 | |
1744 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
1745 | || (s->sh_flags & masks[m][1]) |
1746 | || s->sh_entsize != ~0UL |
1747 | || !strstarts(secstrings + s->sh_name, ".init")) |
1748 | continue; |
1749 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1750 | | INIT_OFFSET_MASK); |
1751 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
1752 | } |
1753 | if (m == 0) |
1754 | mod->init_text_size = mod->init_size; |
1755 | } |
1756 | } |
1757 | |
1758 | static void set_license(struct module *mod, const char *license) |
1759 | { |
1760 | if (!license) |
1761 | license = "unspecified"; |
1762 | |
1763 | if (!license_is_gpl_compatible(license)) { |
1764 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1765 | printk(KERN_WARNING "%s: module license '%s' taints " |
1766 | "kernel.\n", mod->name, license); |
1767 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
1768 | } |
1769 | } |
1770 | |
1771 | /* Parse tag=value strings from .modinfo section */ |
1772 | static char *next_string(char *string, unsigned long *secsize) |
1773 | { |
1774 | /* Skip non-zero chars */ |
1775 | while (string[0]) { |
1776 | string++; |
1777 | if ((*secsize)-- <= 1) |
1778 | return NULL; |
1779 | } |
1780 | |
1781 | /* Skip any zero padding. */ |
1782 | while (!string[0]) { |
1783 | string++; |
1784 | if ((*secsize)-- <= 1) |
1785 | return NULL; |
1786 | } |
1787 | return string; |
1788 | } |
1789 | |
1790 | static char *get_modinfo(Elf_Shdr *sechdrs, |
1791 | unsigned int info, |
1792 | const char *tag) |
1793 | { |
1794 | char *p; |
1795 | unsigned int taglen = strlen(tag); |
1796 | unsigned long size = sechdrs[info].sh_size; |
1797 | |
1798 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { |
1799 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
1800 | return p + taglen + 1; |
1801 | } |
1802 | return NULL; |
1803 | } |
1804 | |
1805 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1806 | unsigned int infoindex) |
1807 | { |
1808 | struct module_attribute *attr; |
1809 | int i; |
1810 | |
1811 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
1812 | if (attr->setup) |
1813 | attr->setup(mod, |
1814 | get_modinfo(sechdrs, |
1815 | infoindex, |
1816 | attr->attr.name)); |
1817 | } |
1818 | } |
1819 | |
1820 | static void free_modinfo(struct module *mod) |
1821 | { |
1822 | struct module_attribute *attr; |
1823 | int i; |
1824 | |
1825 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
1826 | if (attr->free) |
1827 | attr->free(mod); |
1828 | } |
1829 | } |
1830 | |
1831 | #ifdef CONFIG_KALLSYMS |
1832 | |
1833 | /* lookup symbol in given range of kernel_symbols */ |
1834 | static const struct kernel_symbol *lookup_symbol(const char *name, |
1835 | const struct kernel_symbol *start, |
1836 | const struct kernel_symbol *stop) |
1837 | { |
1838 | const struct kernel_symbol *ks = start; |
1839 | for (; ks < stop; ks++) |
1840 | if (strcmp(ks->name, name) == 0) |
1841 | return ks; |
1842 | return NULL; |
1843 | } |
1844 | |
1845 | static int is_exported(const char *name, unsigned long value, |
1846 | const struct module *mod) |
1847 | { |
1848 | const struct kernel_symbol *ks; |
1849 | if (!mod) |
1850 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
1851 | else |
1852 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
1853 | return ks != NULL && ks->value == value; |
1854 | } |
1855 | |
1856 | /* As per nm */ |
1857 | static char elf_type(const Elf_Sym *sym, |
1858 | Elf_Shdr *sechdrs, |
1859 | const char *secstrings, |
1860 | struct module *mod) |
1861 | { |
1862 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
1863 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) |
1864 | return 'v'; |
1865 | else |
1866 | return 'w'; |
1867 | } |
1868 | if (sym->st_shndx == SHN_UNDEF) |
1869 | return 'U'; |
1870 | if (sym->st_shndx == SHN_ABS) |
1871 | return 'a'; |
1872 | if (sym->st_shndx >= SHN_LORESERVE) |
1873 | return '?'; |
1874 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) |
1875 | return 't'; |
1876 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC |
1877 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { |
1878 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) |
1879 | return 'r'; |
1880 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
1881 | return 'g'; |
1882 | else |
1883 | return 'd'; |
1884 | } |
1885 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { |
1886 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
1887 | return 's'; |
1888 | else |
1889 | return 'b'; |
1890 | } |
1891 | if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug")) |
1892 | return 'n'; |
1893 | return '?'; |
1894 | } |
1895 | |
1896 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
1897 | unsigned int shnum) |
1898 | { |
1899 | const Elf_Shdr *sec; |
1900 | |
1901 | if (src->st_shndx == SHN_UNDEF |
1902 | || src->st_shndx >= shnum |
1903 | || !src->st_name) |
1904 | return false; |
1905 | |
1906 | sec = sechdrs + src->st_shndx; |
1907 | if (!(sec->sh_flags & SHF_ALLOC) |
1908 | #ifndef CONFIG_KALLSYMS_ALL |
1909 | || !(sec->sh_flags & SHF_EXECINSTR) |
1910 | #endif |
1911 | || (sec->sh_entsize & INIT_OFFSET_MASK)) |
1912 | return false; |
1913 | |
1914 | return true; |
1915 | } |
1916 | |
1917 | static unsigned long layout_symtab(struct module *mod, |
1918 | Elf_Shdr *sechdrs, |
1919 | unsigned int symindex, |
1920 | unsigned int strindex, |
1921 | const Elf_Ehdr *hdr, |
1922 | const char *secstrings, |
1923 | unsigned long *pstroffs, |
1924 | unsigned long *strmap) |
1925 | { |
1926 | unsigned long symoffs; |
1927 | Elf_Shdr *symsect = sechdrs + symindex; |
1928 | Elf_Shdr *strsect = sechdrs + strindex; |
1929 | const Elf_Sym *src; |
1930 | const char *strtab; |
1931 | unsigned int i, nsrc, ndst; |
1932 | |
1933 | /* Put symbol section at end of init part of module. */ |
1934 | symsect->sh_flags |= SHF_ALLOC; |
1935 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, |
1936 | symindex) | INIT_OFFSET_MASK; |
1937 | DEBUGP("\t%s\n", secstrings + symsect->sh_name); |
1938 | |
1939 | src = (void *)hdr + symsect->sh_offset; |
1940 | nsrc = symsect->sh_size / sizeof(*src); |
1941 | strtab = (void *)hdr + strsect->sh_offset; |
1942 | for (ndst = i = 1; i < nsrc; ++i, ++src) |
1943 | if (is_core_symbol(src, sechdrs, hdr->e_shnum)) { |
1944 | unsigned int j = src->st_name; |
1945 | |
1946 | while(!__test_and_set_bit(j, strmap) && strtab[j]) |
1947 | ++j; |
1948 | ++ndst; |
1949 | } |
1950 | |
1951 | /* Append room for core symbols at end of core part. */ |
1952 | symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
1953 | mod->core_size = symoffs + ndst * sizeof(Elf_Sym); |
1954 | |
1955 | /* Put string table section at end of init part of module. */ |
1956 | strsect->sh_flags |= SHF_ALLOC; |
1957 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, |
1958 | strindex) | INIT_OFFSET_MASK; |
1959 | DEBUGP("\t%s\n", secstrings + strsect->sh_name); |
1960 | |
1961 | /* Append room for core symbols' strings at end of core part. */ |
1962 | *pstroffs = mod->core_size; |
1963 | __set_bit(0, strmap); |
1964 | mod->core_size += bitmap_weight(strmap, strsect->sh_size); |
1965 | |
1966 | return symoffs; |
1967 | } |
1968 | |
1969 | static void add_kallsyms(struct module *mod, |
1970 | Elf_Shdr *sechdrs, |
1971 | unsigned int shnum, |
1972 | unsigned int symindex, |
1973 | unsigned int strindex, |
1974 | unsigned long symoffs, |
1975 | unsigned long stroffs, |
1976 | const char *secstrings, |
1977 | unsigned long *strmap) |
1978 | { |
1979 | unsigned int i, ndst; |
1980 | const Elf_Sym *src; |
1981 | Elf_Sym *dst; |
1982 | char *s; |
1983 | |
1984 | mod->symtab = (void *)sechdrs[symindex].sh_addr; |
1985 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
1986 | mod->strtab = (void *)sechdrs[strindex].sh_addr; |
1987 | |
1988 | /* Set types up while we still have access to sections. */ |
1989 | for (i = 0; i < mod->num_symtab; i++) |
1990 | mod->symtab[i].st_info |
1991 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); |
1992 | |
1993 | mod->core_symtab = dst = mod->module_core + symoffs; |
1994 | src = mod->symtab; |
1995 | *dst = *src; |
1996 | for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { |
1997 | if (!is_core_symbol(src, sechdrs, shnum)) |
1998 | continue; |
1999 | dst[ndst] = *src; |
2000 | dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name); |
2001 | ++ndst; |
2002 | } |
2003 | mod->core_num_syms = ndst; |
2004 | |
2005 | mod->core_strtab = s = mod->module_core + stroffs; |
2006 | for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i) |
2007 | if (test_bit(i, strmap)) |
2008 | *++s = mod->strtab[i]; |
2009 | } |
2010 | #else |
2011 | static inline unsigned long layout_symtab(struct module *mod, |
2012 | Elf_Shdr *sechdrs, |
2013 | unsigned int symindex, |
2014 | unsigned int strindex, |
2015 | const Elf_Ehdr *hdr, |
2016 | const char *secstrings, |
2017 | unsigned long *pstroffs, |
2018 | unsigned long *strmap) |
2019 | { |
2020 | return 0; |
2021 | } |
2022 | |
2023 | static inline void add_kallsyms(struct module *mod, |
2024 | Elf_Shdr *sechdrs, |
2025 | unsigned int shnum, |
2026 | unsigned int symindex, |
2027 | unsigned int strindex, |
2028 | unsigned long symoffs, |
2029 | unsigned long stroffs, |
2030 | const char *secstrings, |
2031 | const unsigned long *strmap) |
2032 | { |
2033 | } |
2034 | #endif /* CONFIG_KALLSYMS */ |
2035 | |
2036 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
2037 | { |
2038 | #ifdef CONFIG_DYNAMIC_DEBUG |
2039 | if (ddebug_add_module(debug, num, debug->modname)) |
2040 | printk(KERN_ERR "dynamic debug error adding module: %s\n", |
2041 | debug->modname); |
2042 | #endif |
2043 | } |
2044 | |
2045 | static void *module_alloc_update_bounds(unsigned long size) |
2046 | { |
2047 | void *ret = module_alloc(size); |
2048 | |
2049 | if (ret) { |
2050 | /* Update module bounds. */ |
2051 | if ((unsigned long)ret < module_addr_min) |
2052 | module_addr_min = (unsigned long)ret; |
2053 | if ((unsigned long)ret + size > module_addr_max) |
2054 | module_addr_max = (unsigned long)ret + size; |
2055 | } |
2056 | return ret; |
2057 | } |
2058 | |
2059 | #ifdef CONFIG_DEBUG_KMEMLEAK |
2060 | static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, |
2061 | Elf_Shdr *sechdrs, char *secstrings) |
2062 | { |
2063 | unsigned int i; |
2064 | |
2065 | /* only scan the sections containing data */ |
2066 | kmemleak_scan_area(mod->module_core, (unsigned long)mod - |
2067 | (unsigned long)mod->module_core, |
2068 | sizeof(struct module), GFP_KERNEL); |
2069 | |
2070 | for (i = 1; i < hdr->e_shnum; i++) { |
2071 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
2072 | continue; |
2073 | if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0 |
2074 | && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0) |
2075 | continue; |
2076 | |
2077 | kmemleak_scan_area(mod->module_core, sechdrs[i].sh_addr - |
2078 | (unsigned long)mod->module_core, |
2079 | sechdrs[i].sh_size, GFP_KERNEL); |
2080 | } |
2081 | } |
2082 | #else |
2083 | static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, |
2084 | Elf_Shdr *sechdrs, char *secstrings) |
2085 | { |
2086 | } |
2087 | #endif |
2088 | |
2089 | /* Allocate and load the module: note that size of section 0 is always |
2090 | zero, and we rely on this for optional sections. */ |
2091 | static noinline struct module *load_module(void __user *umod, |
2092 | unsigned long len, |
2093 | const char __user *uargs) |
2094 | { |
2095 | Elf_Ehdr *hdr; |
2096 | Elf_Shdr *sechdrs; |
2097 | char *secstrings, *args, *modmagic, *strtab = NULL; |
2098 | char *staging; |
2099 | unsigned int i; |
2100 | unsigned int symindex = 0; |
2101 | unsigned int strindex = 0; |
2102 | unsigned int modindex, versindex, infoindex, pcpuindex; |
2103 | struct module *mod; |
2104 | long err = 0; |
2105 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ |
2106 | unsigned long symoffs, stroffs, *strmap; |
2107 | |
2108 | mm_segment_t old_fs; |
2109 | |
2110 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", |
2111 | umod, len, uargs); |
2112 | if (len < sizeof(*hdr)) |
2113 | return ERR_PTR(-ENOEXEC); |
2114 | |
2115 | /* Suck in entire file: we'll want most of it. */ |
2116 | /* vmalloc barfs on "unusual" numbers. Check here */ |
2117 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) |
2118 | return ERR_PTR(-ENOMEM); |
2119 | |
2120 | if (copy_from_user(hdr, umod, len) != 0) { |
2121 | err = -EFAULT; |
2122 | goto free_hdr; |
2123 | } |
2124 | |
2125 | /* Sanity checks against insmoding binaries or wrong arch, |
2126 | weird elf version */ |
2127 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
2128 | || hdr->e_type != ET_REL |
2129 | || !elf_check_arch(hdr) |
2130 | || hdr->e_shentsize != sizeof(*sechdrs)) { |
2131 | err = -ENOEXEC; |
2132 | goto free_hdr; |
2133 | } |
2134 | |
2135 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) |
2136 | goto truncated; |
2137 | |
2138 | /* Convenience variables */ |
2139 | sechdrs = (void *)hdr + hdr->e_shoff; |
2140 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
2141 | sechdrs[0].sh_addr = 0; |
2142 | |
2143 | for (i = 1; i < hdr->e_shnum; i++) { |
2144 | if (sechdrs[i].sh_type != SHT_NOBITS |
2145 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) |
2146 | goto truncated; |
2147 | |
2148 | /* Mark all sections sh_addr with their address in the |
2149 | temporary image. */ |
2150 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; |
2151 | |
2152 | /* Internal symbols and strings. */ |
2153 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
2154 | symindex = i; |
2155 | strindex = sechdrs[i].sh_link; |
2156 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; |
2157 | } |
2158 | #ifndef CONFIG_MODULE_UNLOAD |
2159 | /* Don't load .exit sections */ |
2160 | if (strstarts(secstrings+sechdrs[i].sh_name, ".exit")) |
2161 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2162 | #endif |
2163 | } |
2164 | |
2165 | modindex = find_sec(hdr, sechdrs, secstrings, |
2166 | ".gnu.linkonce.this_module"); |
2167 | if (!modindex) { |
2168 | printk(KERN_WARNING "No module found in object\n"); |
2169 | err = -ENOEXEC; |
2170 | goto free_hdr; |
2171 | } |
2172 | /* This is temporary: point mod into copy of data. */ |
2173 | mod = (void *)sechdrs[modindex].sh_addr; |
2174 | |
2175 | if (symindex == 0) { |
2176 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", |
2177 | mod->name); |
2178 | err = -ENOEXEC; |
2179 | goto free_hdr; |
2180 | } |
2181 | |
2182 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); |
2183 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); |
2184 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); |
2185 | |
2186 | /* Don't keep modinfo and version sections. */ |
2187 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2188 | sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2189 | |
2190 | /* Check module struct version now, before we try to use module. */ |
2191 | if (!check_modstruct_version(sechdrs, versindex, mod)) { |
2192 | err = -ENOEXEC; |
2193 | goto free_hdr; |
2194 | } |
2195 | |
2196 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); |
2197 | /* This is allowed: modprobe --force will invalidate it. */ |
2198 | if (!modmagic) { |
2199 | err = try_to_force_load(mod, "bad vermagic"); |
2200 | if (err) |
2201 | goto free_hdr; |
2202 | } else if (!same_magic(modmagic, vermagic, versindex)) { |
2203 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
2204 | mod->name, modmagic, vermagic); |
2205 | err = -ENOEXEC; |
2206 | goto free_hdr; |
2207 | } |
2208 | |
2209 | staging = get_modinfo(sechdrs, infoindex, "staging"); |
2210 | if (staging) { |
2211 | add_taint_module(mod, TAINT_CRAP); |
2212 | printk(KERN_WARNING "%s: module is from the staging directory," |
2213 | " the quality is unknown, you have been warned.\n", |
2214 | mod->name); |
2215 | } |
2216 | |
2217 | /* Now copy in args */ |
2218 | args = strndup_user(uargs, ~0UL >> 1); |
2219 | if (IS_ERR(args)) { |
2220 | err = PTR_ERR(args); |
2221 | goto free_hdr; |
2222 | } |
2223 | |
2224 | strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size) |
2225 | * sizeof(long), GFP_KERNEL); |
2226 | if (!strmap) { |
2227 | err = -ENOMEM; |
2228 | goto free_mod; |
2229 | } |
2230 | |
2231 | if (find_module(mod->name)) { |
2232 | err = -EEXIST; |
2233 | goto free_mod; |
2234 | } |
2235 | |
2236 | mod->state = MODULE_STATE_COMING; |
2237 | |
2238 | /* Allow arches to frob section contents and sizes. */ |
2239 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); |
2240 | if (err < 0) |
2241 | goto free_mod; |
2242 | |
2243 | if (pcpuindex) { |
2244 | /* We have a special allocation for this section. */ |
2245 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, |
2246 | sechdrs[pcpuindex].sh_addralign, |
2247 | mod->name); |
2248 | if (!percpu) { |
2249 | err = -ENOMEM; |
2250 | goto free_mod; |
2251 | } |
2252 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2253 | mod->percpu = percpu; |
2254 | } |
2255 | |
2256 | /* Determine total sizes, and put offsets in sh_entsize. For now |
2257 | this is done generically; there doesn't appear to be any |
2258 | special cases for the architectures. */ |
2259 | layout_sections(mod, hdr, sechdrs, secstrings); |
2260 | symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr, |
2261 | secstrings, &stroffs, strmap); |
2262 | |
2263 | /* Do the allocs. */ |
2264 | ptr = module_alloc_update_bounds(mod->core_size); |
2265 | /* |
2266 | * The pointer to this block is stored in the module structure |
2267 | * which is inside the block. Just mark it as not being a |
2268 | * leak. |
2269 | */ |
2270 | kmemleak_not_leak(ptr); |
2271 | if (!ptr) { |
2272 | err = -ENOMEM; |
2273 | goto free_percpu; |
2274 | } |
2275 | memset(ptr, 0, mod->core_size); |
2276 | mod->module_core = ptr; |
2277 | |
2278 | ptr = module_alloc_update_bounds(mod->init_size); |
2279 | /* |
2280 | * The pointer to this block is stored in the module structure |
2281 | * which is inside the block. This block doesn't need to be |
2282 | * scanned as it contains data and code that will be freed |
2283 | * after the module is initialized. |
2284 | */ |
2285 | kmemleak_ignore(ptr); |
2286 | if (!ptr && mod->init_size) { |
2287 | err = -ENOMEM; |
2288 | goto free_core; |
2289 | } |
2290 | memset(ptr, 0, mod->init_size); |
2291 | mod->module_init = ptr; |
2292 | |
2293 | /* Transfer each section which specifies SHF_ALLOC */ |
2294 | DEBUGP("final section addresses:\n"); |
2295 | for (i = 0; i < hdr->e_shnum; i++) { |
2296 | void *dest; |
2297 | |
2298 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
2299 | continue; |
2300 | |
2301 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) |
2302 | dest = mod->module_init |
2303 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); |
2304 | else |
2305 | dest = mod->module_core + sechdrs[i].sh_entsize; |
2306 | |
2307 | if (sechdrs[i].sh_type != SHT_NOBITS) |
2308 | memcpy(dest, (void *)sechdrs[i].sh_addr, |
2309 | sechdrs[i].sh_size); |
2310 | /* Update sh_addr to point to copy in image. */ |
2311 | sechdrs[i].sh_addr = (unsigned long)dest; |
2312 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); |
2313 | } |
2314 | /* Module has been moved. */ |
2315 | mod = (void *)sechdrs[modindex].sh_addr; |
2316 | kmemleak_load_module(mod, hdr, sechdrs, secstrings); |
2317 | |
2318 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
2319 | mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t), |
2320 | mod->name); |
2321 | if (!mod->refptr) { |
2322 | err = -ENOMEM; |
2323 | goto free_init; |
2324 | } |
2325 | #endif |
2326 | /* Now we've moved module, initialize linked lists, etc. */ |
2327 | module_unload_init(mod); |
2328 | |
2329 | /* add kobject, so we can reference it. */ |
2330 | err = mod_sysfs_init(mod); |
2331 | if (err) |
2332 | goto free_unload; |
2333 | |
2334 | /* Set up license info based on the info section */ |
2335 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); |
2336 | |
2337 | /* |
2338 | * ndiswrapper is under GPL by itself, but loads proprietary modules. |
2339 | * Don't use add_taint_module(), as it would prevent ndiswrapper from |
2340 | * using GPL-only symbols it needs. |
2341 | */ |
2342 | if (strcmp(mod->name, "ndiswrapper") == 0) |
2343 | add_taint(TAINT_PROPRIETARY_MODULE); |
2344 | |
2345 | /* driverloader was caught wrongly pretending to be under GPL */ |
2346 | if (strcmp(mod->name, "driverloader") == 0) |
2347 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
2348 | |
2349 | /* Set up MODINFO_ATTR fields */ |
2350 | setup_modinfo(mod, sechdrs, infoindex); |
2351 | |
2352 | /* Fix up syms, so that st_value is a pointer to location. */ |
2353 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, |
2354 | mod); |
2355 | if (err < 0) |
2356 | goto cleanup; |
2357 | |
2358 | /* Now we've got everything in the final locations, we can |
2359 | * find optional sections. */ |
2360 | mod->kp = section_objs(hdr, sechdrs, secstrings, "__param", |
2361 | sizeof(*mod->kp), &mod->num_kp); |
2362 | mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab", |
2363 | sizeof(*mod->syms), &mod->num_syms); |
2364 | mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab"); |
2365 | mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl", |
2366 | sizeof(*mod->gpl_syms), |
2367 | &mod->num_gpl_syms); |
2368 | mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl"); |
2369 | mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings, |
2370 | "__ksymtab_gpl_future", |
2371 | sizeof(*mod->gpl_future_syms), |
2372 | &mod->num_gpl_future_syms); |
2373 | mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings, |
2374 | "__kcrctab_gpl_future"); |
2375 | |
2376 | #ifdef CONFIG_UNUSED_SYMBOLS |
2377 | mod->unused_syms = section_objs(hdr, sechdrs, secstrings, |
2378 | "__ksymtab_unused", |
2379 | sizeof(*mod->unused_syms), |
2380 | &mod->num_unused_syms); |
2381 | mod->unused_crcs = section_addr(hdr, sechdrs, secstrings, |
2382 | "__kcrctab_unused"); |
2383 | mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings, |
2384 | "__ksymtab_unused_gpl", |
2385 | sizeof(*mod->unused_gpl_syms), |
2386 | &mod->num_unused_gpl_syms); |
2387 | mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings, |
2388 | "__kcrctab_unused_gpl"); |
2389 | #endif |
2390 | #ifdef CONFIG_CONSTRUCTORS |
2391 | mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors", |
2392 | sizeof(*mod->ctors), &mod->num_ctors); |
2393 | #endif |
2394 | |
2395 | #ifdef CONFIG_TRACEPOINTS |
2396 | mod->tracepoints = section_objs(hdr, sechdrs, secstrings, |
2397 | "__tracepoints", |
2398 | sizeof(*mod->tracepoints), |
2399 | &mod->num_tracepoints); |
2400 | #endif |
2401 | #ifdef CONFIG_EVENT_TRACING |
2402 | mod->trace_events = section_objs(hdr, sechdrs, secstrings, |
2403 | "_ftrace_events", |
2404 | sizeof(*mod->trace_events), |
2405 | &mod->num_trace_events); |
2406 | #endif |
2407 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2408 | /* sechdrs[0].sh_size is always zero */ |
2409 | mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings, |
2410 | "__mcount_loc", |
2411 | sizeof(*mod->ftrace_callsites), |
2412 | &mod->num_ftrace_callsites); |
2413 | #endif |
2414 | #ifdef CONFIG_MODVERSIONS |
2415 | if ((mod->num_syms && !mod->crcs) |
2416 | || (mod->num_gpl_syms && !mod->gpl_crcs) |
2417 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) |
2418 | #ifdef CONFIG_UNUSED_SYMBOLS |
2419 | || (mod->num_unused_syms && !mod->unused_crcs) |
2420 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) |
2421 | #endif |
2422 | ) { |
2423 | err = try_to_force_load(mod, |
2424 | "no versions for exported symbols"); |
2425 | if (err) |
2426 | goto cleanup; |
2427 | } |
2428 | #endif |
2429 | |
2430 | /* Now do relocations. */ |
2431 | for (i = 1; i < hdr->e_shnum; i++) { |
2432 | const char *strtab = (char *)sechdrs[strindex].sh_addr; |
2433 | unsigned int info = sechdrs[i].sh_info; |
2434 | |
2435 | /* Not a valid relocation section? */ |
2436 | if (info >= hdr->e_shnum) |
2437 | continue; |
2438 | |
2439 | /* Don't bother with non-allocated sections */ |
2440 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) |
2441 | continue; |
2442 | |
2443 | if (sechdrs[i].sh_type == SHT_REL) |
2444 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); |
2445 | else if (sechdrs[i].sh_type == SHT_RELA) |
2446 | err = apply_relocate_add(sechdrs, strtab, symindex, i, |
2447 | mod); |
2448 | if (err < 0) |
2449 | goto cleanup; |
2450 | } |
2451 | |
2452 | /* Find duplicate symbols */ |
2453 | err = verify_export_symbols(mod); |
2454 | if (err < 0) |
2455 | goto cleanup; |
2456 | |
2457 | /* Set up and sort exception table */ |
2458 | mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table", |
2459 | sizeof(*mod->extable), &mod->num_exentries); |
2460 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
2461 | |
2462 | /* Finally, copy percpu area over. */ |
2463 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, |
2464 | sechdrs[pcpuindex].sh_size); |
2465 | |
2466 | add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex, |
2467 | symoffs, stroffs, secstrings, strmap); |
2468 | kfree(strmap); |
2469 | strmap = NULL; |
2470 | |
2471 | if (!mod->taints) { |
2472 | struct _ddebug *debug; |
2473 | unsigned int num_debug; |
2474 | |
2475 | debug = section_objs(hdr, sechdrs, secstrings, "__verbose", |
2476 | sizeof(*debug), &num_debug); |
2477 | if (debug) |
2478 | dynamic_debug_setup(debug, num_debug); |
2479 | } |
2480 | |
2481 | err = module_finalize(hdr, sechdrs, mod); |
2482 | if (err < 0) |
2483 | goto cleanup; |
2484 | |
2485 | /* flush the icache in correct context */ |
2486 | old_fs = get_fs(); |
2487 | set_fs(KERNEL_DS); |
2488 | |
2489 | /* |
2490 | * Flush the instruction cache, since we've played with text. |
2491 | * Do it before processing of module parameters, so the module |
2492 | * can provide parameter accessor functions of its own. |
2493 | */ |
2494 | if (mod->module_init) |
2495 | flush_icache_range((unsigned long)mod->module_init, |
2496 | (unsigned long)mod->module_init |
2497 | + mod->init_size); |
2498 | flush_icache_range((unsigned long)mod->module_core, |
2499 | (unsigned long)mod->module_core + mod->core_size); |
2500 | |
2501 | set_fs(old_fs); |
2502 | |
2503 | mod->args = args; |
2504 | if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) |
2505 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2506 | mod->name); |
2507 | |
2508 | /* Now sew it into the lists so we can get lockdep and oops |
2509 | * info during argument parsing. Noone should access us, since |
2510 | * strong_try_module_get() will fail. |
2511 | * lockdep/oops can run asynchronous, so use the RCU list insertion |
2512 | * function to insert in a way safe to concurrent readers. |
2513 | * The mutex protects against concurrent writers. |
2514 | */ |
2515 | list_add_rcu(&mod->list, &modules); |
2516 | |
2517 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
2518 | if (err < 0) |
2519 | goto unlink; |
2520 | |
2521 | err = mod_sysfs_setup(mod, mod->kp, mod->num_kp); |
2522 | if (err < 0) |
2523 | goto unlink; |
2524 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
2525 | add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
2526 | |
2527 | /* Get rid of temporary copy */ |
2528 | vfree(hdr); |
2529 | |
2530 | trace_module_load(mod); |
2531 | |
2532 | /* Done! */ |
2533 | return mod; |
2534 | |
2535 | unlink: |
2536 | /* Unlink carefully: kallsyms could be walking list. */ |
2537 | list_del_rcu(&mod->list); |
2538 | synchronize_sched(); |
2539 | module_arch_cleanup(mod); |
2540 | cleanup: |
2541 | free_modinfo(mod); |
2542 | kobject_del(&mod->mkobj.kobj); |
2543 | kobject_put(&mod->mkobj.kobj); |
2544 | free_unload: |
2545 | module_unload_free(mod); |
2546 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
2547 | percpu_modfree(mod->refptr); |
2548 | free_init: |
2549 | #endif |
2550 | module_free(mod, mod->module_init); |
2551 | free_core: |
2552 | module_free(mod, mod->module_core); |
2553 | /* mod will be freed with core. Don't access it beyond this line! */ |
2554 | free_percpu: |
2555 | if (percpu) |
2556 | percpu_modfree(percpu); |
2557 | free_mod: |
2558 | kfree(args); |
2559 | kfree(strmap); |
2560 | free_hdr: |
2561 | vfree(hdr); |
2562 | return ERR_PTR(err); |
2563 | |
2564 | truncated: |
2565 | printk(KERN_ERR "Module len %lu truncated\n", len); |
2566 | err = -ENOEXEC; |
2567 | goto free_hdr; |
2568 | } |
2569 | |
2570 | /* Call module constructors. */ |
2571 | static void do_mod_ctors(struct module *mod) |
2572 | { |
2573 | #ifdef CONFIG_CONSTRUCTORS |
2574 | unsigned long i; |
2575 | |
2576 | for (i = 0; i < mod->num_ctors; i++) |
2577 | mod->ctors[i](); |
2578 | #endif |
2579 | } |
2580 | |
2581 | /* This is where the real work happens */ |
2582 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2583 | unsigned long, len, const char __user *, uargs) |
2584 | { |
2585 | struct module *mod; |
2586 | int ret = 0; |
2587 | |
2588 | /* Must have permission */ |
2589 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
2590 | return -EPERM; |
2591 | |
2592 | /* Only one module load at a time, please */ |
2593 | if (mutex_lock_interruptible(&module_mutex) != 0) |
2594 | return -EINTR; |
2595 | |
2596 | /* Do all the hard work */ |
2597 | mod = load_module(umod, len, uargs); |
2598 | if (IS_ERR(mod)) { |
2599 | mutex_unlock(&module_mutex); |
2600 | return PTR_ERR(mod); |
2601 | } |
2602 | |
2603 | /* Drop lock so they can recurse */ |
2604 | mutex_unlock(&module_mutex); |
2605 | |
2606 | blocking_notifier_call_chain(&module_notify_list, |
2607 | MODULE_STATE_COMING, mod); |
2608 | |
2609 | do_mod_ctors(mod); |
2610 | /* Start the module */ |
2611 | if (mod->init != NULL) |
2612 | ret = do_one_initcall(mod->init); |
2613 | if (ret < 0) { |
2614 | /* Init routine failed: abort. Try to protect us from |
2615 | buggy refcounters. */ |
2616 | mod->state = MODULE_STATE_GOING; |
2617 | synchronize_sched(); |
2618 | module_put(mod); |
2619 | blocking_notifier_call_chain(&module_notify_list, |
2620 | MODULE_STATE_GOING, mod); |
2621 | mutex_lock(&module_mutex); |
2622 | free_module(mod); |
2623 | mutex_unlock(&module_mutex); |
2624 | wake_up(&module_wq); |
2625 | return ret; |
2626 | } |
2627 | if (ret > 0) { |
2628 | printk(KERN_WARNING |
2629 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" |
2630 | "%s: loading module anyway...\n", |
2631 | __func__, mod->name, ret, |
2632 | __func__); |
2633 | dump_stack(); |
2634 | } |
2635 | |
2636 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
2637 | mod->state = MODULE_STATE_LIVE; |
2638 | wake_up(&module_wq); |
2639 | blocking_notifier_call_chain(&module_notify_list, |
2640 | MODULE_STATE_LIVE, mod); |
2641 | |
2642 | /* We need to finish all async code before the module init sequence is done */ |
2643 | async_synchronize_full(); |
2644 | |
2645 | mutex_lock(&module_mutex); |
2646 | /* Drop initial reference. */ |
2647 | module_put(mod); |
2648 | trim_init_extable(mod); |
2649 | #ifdef CONFIG_KALLSYMS |
2650 | mod->num_symtab = mod->core_num_syms; |
2651 | mod->symtab = mod->core_symtab; |
2652 | mod->strtab = mod->core_strtab; |
2653 | #endif |
2654 | module_free(mod, mod->module_init); |
2655 | mod->module_init = NULL; |
2656 | mod->init_size = 0; |
2657 | mod->init_text_size = 0; |
2658 | mutex_unlock(&module_mutex); |
2659 | |
2660 | return 0; |
2661 | } |
2662 | |
2663 | static inline int within(unsigned long addr, void *start, unsigned long size) |
2664 | { |
2665 | return ((void *)addr >= start && (void *)addr < start + size); |
2666 | } |
2667 | |
2668 | #ifdef CONFIG_KALLSYMS |
2669 | /* |
2670 | * This ignores the intensely annoying "mapping symbols" found |
2671 | * in ARM ELF files: $a, $t and $d. |
2672 | */ |
2673 | static inline int is_arm_mapping_symbol(const char *str) |
2674 | { |
2675 | return str[0] == '$' && strchr("atd", str[1]) |
2676 | && (str[2] == '\0' || str[2] == '.'); |
2677 | } |
2678 | |
2679 | static const char *get_ksymbol(struct module *mod, |
2680 | unsigned long addr, |
2681 | unsigned long *size, |
2682 | unsigned long *offset) |
2683 | { |
2684 | unsigned int i, best = 0; |
2685 | unsigned long nextval; |
2686 | |
2687 | /* At worse, next value is at end of module */ |
2688 | if (within_module_init(addr, mod)) |
2689 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
2690 | else |
2691 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2692 | |
2693 | /* Scan for closest preceeding symbol, and next symbol. (ELF |
2694 | starts real symbols at 1). */ |
2695 | for (i = 1; i < mod->num_symtab; i++) { |
2696 | if (mod->symtab[i].st_shndx == SHN_UNDEF) |
2697 | continue; |
2698 | |
2699 | /* We ignore unnamed symbols: they're uninformative |
2700 | * and inserted at a whim. */ |
2701 | if (mod->symtab[i].st_value <= addr |
2702 | && mod->symtab[i].st_value > mod->symtab[best].st_value |
2703 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
2704 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
2705 | best = i; |
2706 | if (mod->symtab[i].st_value > addr |
2707 | && mod->symtab[i].st_value < nextval |
2708 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
2709 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
2710 | nextval = mod->symtab[i].st_value; |
2711 | } |
2712 | |
2713 | if (!best) |
2714 | return NULL; |
2715 | |
2716 | if (size) |
2717 | *size = nextval - mod->symtab[best].st_value; |
2718 | if (offset) |
2719 | *offset = addr - mod->symtab[best].st_value; |
2720 | return mod->strtab + mod->symtab[best].st_name; |
2721 | } |
2722 | |
2723 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2724 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ |
2725 | const char *module_address_lookup(unsigned long addr, |
2726 | unsigned long *size, |
2727 | unsigned long *offset, |
2728 | char **modname, |
2729 | char *namebuf) |
2730 | { |
2731 | struct module *mod; |
2732 | const char *ret = NULL; |
2733 | |
2734 | preempt_disable(); |
2735 | list_for_each_entry_rcu(mod, &modules, list) { |
2736 | if (within_module_init(addr, mod) || |
2737 | within_module_core(addr, mod)) { |
2738 | if (modname) |
2739 | *modname = mod->name; |
2740 | ret = get_ksymbol(mod, addr, size, offset); |
2741 | break; |
2742 | } |
2743 | } |
2744 | /* Make a copy in here where it's safe */ |
2745 | if (ret) { |
2746 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); |
2747 | ret = namebuf; |
2748 | } |
2749 | preempt_enable(); |
2750 | return ret; |
2751 | } |
2752 | |
2753 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2754 | { |
2755 | struct module *mod; |
2756 | |
2757 | preempt_disable(); |
2758 | list_for_each_entry_rcu(mod, &modules, list) { |
2759 | if (within_module_init(addr, mod) || |
2760 | within_module_core(addr, mod)) { |
2761 | const char *sym; |
2762 | |
2763 | sym = get_ksymbol(mod, addr, NULL, NULL); |
2764 | if (!sym) |
2765 | goto out; |
2766 | strlcpy(symname, sym, KSYM_NAME_LEN); |
2767 | preempt_enable(); |
2768 | return 0; |
2769 | } |
2770 | } |
2771 | out: |
2772 | preempt_enable(); |
2773 | return -ERANGE; |
2774 | } |
2775 | |
2776 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2777 | unsigned long *offset, char *modname, char *name) |
2778 | { |
2779 | struct module *mod; |
2780 | |
2781 | preempt_disable(); |
2782 | list_for_each_entry_rcu(mod, &modules, list) { |
2783 | if (within_module_init(addr, mod) || |
2784 | within_module_core(addr, mod)) { |
2785 | const char *sym; |
2786 | |
2787 | sym = get_ksymbol(mod, addr, size, offset); |
2788 | if (!sym) |
2789 | goto out; |
2790 | if (modname) |
2791 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
2792 | if (name) |
2793 | strlcpy(name, sym, KSYM_NAME_LEN); |
2794 | preempt_enable(); |
2795 | return 0; |
2796 | } |
2797 | } |
2798 | out: |
2799 | preempt_enable(); |
2800 | return -ERANGE; |
2801 | } |
2802 | |
2803 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2804 | char *name, char *module_name, int *exported) |
2805 | { |
2806 | struct module *mod; |
2807 | |
2808 | preempt_disable(); |
2809 | list_for_each_entry_rcu(mod, &modules, list) { |
2810 | if (symnum < mod->num_symtab) { |
2811 | *value = mod->symtab[symnum].st_value; |
2812 | *type = mod->symtab[symnum].st_info; |
2813 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
2814 | KSYM_NAME_LEN); |
2815 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
2816 | *exported = is_exported(name, *value, mod); |
2817 | preempt_enable(); |
2818 | return 0; |
2819 | } |
2820 | symnum -= mod->num_symtab; |
2821 | } |
2822 | preempt_enable(); |
2823 | return -ERANGE; |
2824 | } |
2825 | |
2826 | static unsigned long mod_find_symname(struct module *mod, const char *name) |
2827 | { |
2828 | unsigned int i; |
2829 | |
2830 | for (i = 0; i < mod->num_symtab; i++) |
2831 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2832 | mod->symtab[i].st_info != 'U') |
2833 | return mod->symtab[i].st_value; |
2834 | return 0; |
2835 | } |
2836 | |
2837 | /* Look for this name: can be of form module:name. */ |
2838 | unsigned long module_kallsyms_lookup_name(const char *name) |
2839 | { |
2840 | struct module *mod; |
2841 | char *colon; |
2842 | unsigned long ret = 0; |
2843 | |
2844 | /* Don't lock: we're in enough trouble already. */ |
2845 | preempt_disable(); |
2846 | if ((colon = strchr(name, ':')) != NULL) { |
2847 | *colon = '\0'; |
2848 | if ((mod = find_module(name)) != NULL) |
2849 | ret = mod_find_symname(mod, colon+1); |
2850 | *colon = ':'; |
2851 | } else { |
2852 | list_for_each_entry_rcu(mod, &modules, list) |
2853 | if ((ret = mod_find_symname(mod, name)) != 0) |
2854 | break; |
2855 | } |
2856 | preempt_enable(); |
2857 | return ret; |
2858 | } |
2859 | |
2860 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, |
2861 | struct module *, unsigned long), |
2862 | void *data) |
2863 | { |
2864 | struct module *mod; |
2865 | unsigned int i; |
2866 | int ret; |
2867 | |
2868 | list_for_each_entry(mod, &modules, list) { |
2869 | for (i = 0; i < mod->num_symtab; i++) { |
2870 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, |
2871 | mod, mod->symtab[i].st_value); |
2872 | if (ret != 0) |
2873 | return ret; |
2874 | } |
2875 | } |
2876 | return 0; |
2877 | } |
2878 | #endif /* CONFIG_KALLSYMS */ |
2879 | |
2880 | static char *module_flags(struct module *mod, char *buf) |
2881 | { |
2882 | int bx = 0; |
2883 | |
2884 | if (mod->taints || |
2885 | mod->state == MODULE_STATE_GOING || |
2886 | mod->state == MODULE_STATE_COMING) { |
2887 | buf[bx++] = '('; |
2888 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
2889 | buf[bx++] = 'P'; |
2890 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
2891 | buf[bx++] = 'F'; |
2892 | if (mod->taints & (1 << TAINT_CRAP)) |
2893 | buf[bx++] = 'C'; |
2894 | /* |
2895 | * TAINT_FORCED_RMMOD: could be added. |
2896 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
2897 | * apply to modules. |
2898 | */ |
2899 | |
2900 | /* Show a - for module-is-being-unloaded */ |
2901 | if (mod->state == MODULE_STATE_GOING) |
2902 | buf[bx++] = '-'; |
2903 | /* Show a + for module-is-being-loaded */ |
2904 | if (mod->state == MODULE_STATE_COMING) |
2905 | buf[bx++] = '+'; |
2906 | buf[bx++] = ')'; |
2907 | } |
2908 | buf[bx] = '\0'; |
2909 | |
2910 | return buf; |
2911 | } |
2912 | |
2913 | #ifdef CONFIG_PROC_FS |
2914 | /* Called by the /proc file system to return a list of modules. */ |
2915 | static void *m_start(struct seq_file *m, loff_t *pos) |
2916 | { |
2917 | mutex_lock(&module_mutex); |
2918 | return seq_list_start(&modules, *pos); |
2919 | } |
2920 | |
2921 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) |
2922 | { |
2923 | return seq_list_next(p, &modules, pos); |
2924 | } |
2925 | |
2926 | static void m_stop(struct seq_file *m, void *p) |
2927 | { |
2928 | mutex_unlock(&module_mutex); |
2929 | } |
2930 | |
2931 | static int m_show(struct seq_file *m, void *p) |
2932 | { |
2933 | struct module *mod = list_entry(p, struct module, list); |
2934 | char buf[8]; |
2935 | |
2936 | seq_printf(m, "%s %u", |
2937 | mod->name, mod->init_size + mod->core_size); |
2938 | print_unload_info(m, mod); |
2939 | |
2940 | /* Informative for users. */ |
2941 | seq_printf(m, " %s", |
2942 | mod->state == MODULE_STATE_GOING ? "Unloading": |
2943 | mod->state == MODULE_STATE_COMING ? "Loading": |
2944 | "Live"); |
2945 | /* Used by oprofile and other similar tools. */ |
2946 | seq_printf(m, " 0x%p", mod->module_core); |
2947 | |
2948 | /* Taints info */ |
2949 | if (mod->taints) |
2950 | seq_printf(m, " %s", module_flags(mod, buf)); |
2951 | |
2952 | seq_printf(m, "\n"); |
2953 | return 0; |
2954 | } |
2955 | |
2956 | /* Format: modulename size refcount deps address |
2957 | |
2958 | Where refcount is a number or -, and deps is a comma-separated list |
2959 | of depends or -. |
2960 | */ |
2961 | static const struct seq_operations modules_op = { |
2962 | .start = m_start, |
2963 | .next = m_next, |
2964 | .stop = m_stop, |
2965 | .show = m_show |
2966 | }; |
2967 | |
2968 | static int modules_open(struct inode *inode, struct file *file) |
2969 | { |
2970 | return seq_open(file, &modules_op); |
2971 | } |
2972 | |
2973 | static const struct file_operations proc_modules_operations = { |
2974 | .open = modules_open, |
2975 | .read = seq_read, |
2976 | .llseek = seq_lseek, |
2977 | .release = seq_release, |
2978 | }; |
2979 | |
2980 | static int __init proc_modules_init(void) |
2981 | { |
2982 | proc_create("modules", 0, NULL, &proc_modules_operations); |
2983 | return 0; |
2984 | } |
2985 | module_init(proc_modules_init); |
2986 | #endif |
2987 | |
2988 | /* Given an address, look for it in the module exception tables. */ |
2989 | const struct exception_table_entry *search_module_extables(unsigned long addr) |
2990 | { |
2991 | const struct exception_table_entry *e = NULL; |
2992 | struct module *mod; |
2993 | |
2994 | preempt_disable(); |
2995 | list_for_each_entry_rcu(mod, &modules, list) { |
2996 | if (mod->num_exentries == 0) |
2997 | continue; |
2998 | |
2999 | e = search_extable(mod->extable, |
3000 | mod->extable + mod->num_exentries - 1, |
3001 | addr); |
3002 | if (e) |
3003 | break; |
3004 | } |
3005 | preempt_enable(); |
3006 | |
3007 | /* Now, if we found one, we are running inside it now, hence |
3008 | we cannot unload the module, hence no refcnt needed. */ |
3009 | return e; |
3010 | } |
3011 | |
3012 | /* |
3013 | * is_module_address - is this address inside a module? |
3014 | * @addr: the address to check. |
3015 | * |
3016 | * See is_module_text_address() if you simply want to see if the address |
3017 | * is code (not data). |
3018 | */ |
3019 | bool is_module_address(unsigned long addr) |
3020 | { |
3021 | bool ret; |
3022 | |
3023 | preempt_disable(); |
3024 | ret = __module_address(addr) != NULL; |
3025 | preempt_enable(); |
3026 | |
3027 | return ret; |
3028 | } |
3029 | |
3030 | /* |
3031 | * __module_address - get the module which contains an address. |
3032 | * @addr: the address. |
3033 | * |
3034 | * Must be called with preempt disabled or module mutex held so that |
3035 | * module doesn't get freed during this. |
3036 | */ |
3037 | struct module *__module_address(unsigned long addr) |
3038 | { |
3039 | struct module *mod; |
3040 | |
3041 | if (addr < module_addr_min || addr > module_addr_max) |
3042 | return NULL; |
3043 | |
3044 | list_for_each_entry_rcu(mod, &modules, list) |
3045 | if (within_module_core(addr, mod) |
3046 | || within_module_init(addr, mod)) |
3047 | return mod; |
3048 | return NULL; |
3049 | } |
3050 | EXPORT_SYMBOL_GPL(__module_address); |
3051 | |
3052 | /* |
3053 | * is_module_text_address - is this address inside module code? |
3054 | * @addr: the address to check. |
3055 | * |
3056 | * See is_module_address() if you simply want to see if the address is |
3057 | * anywhere in a module. See kernel_text_address() for testing if an |
3058 | * address corresponds to kernel or module code. |
3059 | */ |
3060 | bool is_module_text_address(unsigned long addr) |
3061 | { |
3062 | bool ret; |
3063 | |
3064 | preempt_disable(); |
3065 | ret = __module_text_address(addr) != NULL; |
3066 | preempt_enable(); |
3067 | |
3068 | return ret; |
3069 | } |
3070 | |
3071 | /* |
3072 | * __module_text_address - get the module whose code contains an address. |
3073 | * @addr: the address. |
3074 | * |
3075 | * Must be called with preempt disabled or module mutex held so that |
3076 | * module doesn't get freed during this. |
3077 | */ |
3078 | struct module *__module_text_address(unsigned long addr) |
3079 | { |
3080 | struct module *mod = __module_address(addr); |
3081 | if (mod) { |
3082 | /* Make sure it's within the text section. */ |
3083 | if (!within(addr, mod->module_init, mod->init_text_size) |
3084 | && !within(addr, mod->module_core, mod->core_text_size)) |
3085 | mod = NULL; |
3086 | } |
3087 | return mod; |
3088 | } |
3089 | EXPORT_SYMBOL_GPL(__module_text_address); |
3090 | |
3091 | /* Don't grab lock, we're oopsing. */ |
3092 | void print_modules(void) |
3093 | { |
3094 | struct module *mod; |
3095 | char buf[8]; |
3096 | |
3097 | printk(KERN_DEFAULT "Modules linked in:"); |
3098 | /* Most callers should already have preempt disabled, but make sure */ |
3099 | preempt_disable(); |
3100 | list_for_each_entry_rcu(mod, &modules, list) |
3101 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
3102 | preempt_enable(); |
3103 | if (last_unloaded_module[0]) |
3104 | printk(" [last unloaded: %s]", last_unloaded_module); |
3105 | printk("\n"); |
3106 | } |
3107 | |
3108 | #ifdef CONFIG_MODVERSIONS |
3109 | /* Generate the signature for all relevant module structures here. |
3110 | * If these change, we don't want to try to parse the module. */ |
3111 | void module_layout(struct module *mod, |
3112 | struct modversion_info *ver, |
3113 | struct kernel_param *kp, |
3114 | struct kernel_symbol *ks, |
3115 | struct tracepoint *tp) |
3116 | { |
3117 | } |
3118 | EXPORT_SYMBOL(module_layout); |
3119 | #endif |
3120 | |
3121 | #ifdef CONFIG_TRACEPOINTS |
3122 | void module_update_tracepoints(void) |
3123 | { |
3124 | struct module *mod; |
3125 | |
3126 | mutex_lock(&module_mutex); |
3127 | list_for_each_entry(mod, &modules, list) |
3128 | if (!mod->taints) |
3129 | tracepoint_update_probe_range(mod->tracepoints, |
3130 | mod->tracepoints + mod->num_tracepoints); |
3131 | mutex_unlock(&module_mutex); |
3132 | } |
3133 | |
3134 | /* |
3135 | * Returns 0 if current not found. |
3136 | * Returns 1 if current found. |
3137 | */ |
3138 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) |
3139 | { |
3140 | struct module *iter_mod; |
3141 | int found = 0; |
3142 | |
3143 | mutex_lock(&module_mutex); |
3144 | list_for_each_entry(iter_mod, &modules, list) { |
3145 | if (!iter_mod->taints) { |
3146 | /* |
3147 | * Sorted module list |
3148 | */ |
3149 | if (iter_mod < iter->module) |
3150 | continue; |
3151 | else if (iter_mod > iter->module) |
3152 | iter->tracepoint = NULL; |
3153 | found = tracepoint_get_iter_range(&iter->tracepoint, |
3154 | iter_mod->tracepoints, |
3155 | iter_mod->tracepoints |
3156 | + iter_mod->num_tracepoints); |
3157 | if (found) { |
3158 | iter->module = iter_mod; |
3159 | break; |
3160 | } |
3161 | } |
3162 | } |
3163 | mutex_unlock(&module_mutex); |
3164 | return found; |
3165 | } |
3166 | #endif |
3167 |
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v2.6.34-rc5
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