Commit | Line | Data |
---|---|---|
f71d20e9 | 1 | /* |
1da177e4 LT |
2 | Copyright (C) 2002 Richard Henderson |
3 | Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/moduleloader.h> | |
21 | #include <linux/init.h> | |
ae84e324 | 22 | #include <linux/kallsyms.h> |
6d760133 | 23 | #include <linux/sysfs.h> |
9f158333 | 24 | #include <linux/kernel.h> |
1da177e4 LT |
25 | #include <linux/slab.h> |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/elf.h> | |
28 | #include <linux/seq_file.h> | |
29 | #include <linux/syscalls.h> | |
30 | #include <linux/fcntl.h> | |
31 | #include <linux/rcupdate.h> | |
c59ede7b | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/cpu.h> |
34 | #include <linux/moduleparam.h> | |
35 | #include <linux/errno.h> | |
36 | #include <linux/err.h> | |
37 | #include <linux/vermagic.h> | |
38 | #include <linux/notifier.h> | |
f6a57033 | 39 | #include <linux/sched.h> |
1da177e4 LT |
40 | #include <linux/stop_machine.h> |
41 | #include <linux/device.h> | |
c988d2b2 | 42 | #include <linux/string.h> |
97d1f15b | 43 | #include <linux/mutex.h> |
4552d5dc | 44 | #include <linux/unwind.h> |
1da177e4 | 45 | #include <asm/uaccess.h> |
1da177e4 | 46 | #include <asm/cacheflush.h> |
b817f6fe | 47 | #include <linux/license.h> |
6d762394 | 48 | #include <asm/sections.h> |
97e1c18e | 49 | #include <linux/tracepoint.h> |
90d595fe | 50 | #include <linux/ftrace.h> |
1da177e4 LT |
51 | |
52 | #if 0 | |
53 | #define DEBUGP printk | |
54 | #else | |
55 | #define DEBUGP(fmt , a...) | |
56 | #endif | |
57 | ||
58 | #ifndef ARCH_SHF_SMALL | |
59 | #define ARCH_SHF_SMALL 0 | |
60 | #endif | |
61 | ||
62 | /* If this is set, the section belongs in the init part of the module */ | |
63 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
64 | ||
24da1cbf RR |
65 | /* List of modules, protected by module_mutex or preempt_disable |
66 | * (add/delete uses stop_machine). */ | |
6389a385 | 67 | static DEFINE_MUTEX(module_mutex); |
1da177e4 LT |
68 | static LIST_HEAD(modules); |
69 | ||
c9a3ba55 RR |
70 | /* Waiting for a module to finish initializing? */ |
71 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
72 | ||
e041c683 | 73 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 74 | |
3a642e99 RR |
75 | /* Bounds of module allocation, for speeding __module_text_address */ |
76 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; | |
77 | ||
1da177e4 LT |
78 | int register_module_notifier(struct notifier_block * nb) |
79 | { | |
e041c683 | 80 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
81 | } |
82 | EXPORT_SYMBOL(register_module_notifier); | |
83 | ||
84 | int unregister_module_notifier(struct notifier_block * nb) | |
85 | { | |
e041c683 | 86 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
87 | } |
88 | EXPORT_SYMBOL(unregister_module_notifier); | |
89 | ||
9a4b9708 ML |
90 | /* We require a truly strong try_module_get(): 0 means failure due to |
91 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
92 | static inline int strong_try_module_get(struct module *mod) |
93 | { | |
94 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
95 | return -EBUSY; |
96 | if (try_module_get(mod)) | |
1da177e4 | 97 | return 0; |
c9a3ba55 RR |
98 | else |
99 | return -ENOENT; | |
1da177e4 LT |
100 | } |
101 | ||
fa3ba2e8 FM |
102 | static inline void add_taint_module(struct module *mod, unsigned flag) |
103 | { | |
104 | add_taint(flag); | |
25ddbb18 | 105 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
106 | } |
107 | ||
02a3e59a RD |
108 | /* |
109 | * A thread that wants to hold a reference to a module only while it | |
110 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
111 | */ |
112 | void __module_put_and_exit(struct module *mod, long code) | |
113 | { | |
114 | module_put(mod); | |
115 | do_exit(code); | |
116 | } | |
117 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 118 | |
1da177e4 LT |
119 | /* Find a module section: 0 means not found. */ |
120 | static unsigned int find_sec(Elf_Ehdr *hdr, | |
121 | Elf_Shdr *sechdrs, | |
122 | const char *secstrings, | |
123 | const char *name) | |
124 | { | |
125 | unsigned int i; | |
126 | ||
127 | for (i = 1; i < hdr->e_shnum; i++) | |
128 | /* Alloc bit cleared means "ignore it." */ | |
129 | if ((sechdrs[i].sh_flags & SHF_ALLOC) | |
130 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) | |
131 | return i; | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* Provided by the linker */ | |
136 | extern const struct kernel_symbol __start___ksymtab[]; | |
137 | extern const struct kernel_symbol __stop___ksymtab[]; | |
138 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
139 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
140 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
141 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
f71d20e9 AV |
142 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
143 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
144 | extern const unsigned long __start___kcrctab[]; |
145 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 146 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
147 | #ifdef CONFIG_UNUSED_SYMBOLS |
148 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
149 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
150 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
151 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
152 | extern const unsigned long __start___kcrctab_unused[]; |
153 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 154 | #endif |
1da177e4 LT |
155 | |
156 | #ifndef CONFIG_MODVERSIONS | |
157 | #define symversion(base, idx) NULL | |
158 | #else | |
f83ca9fe | 159 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
160 | #endif |
161 | ||
ad9546c9 RR |
162 | struct symsearch { |
163 | const struct kernel_symbol *start, *stop; | |
164 | const unsigned long *crcs; | |
dafd0940 RR |
165 | enum { |
166 | NOT_GPL_ONLY, | |
167 | GPL_ONLY, | |
168 | WILL_BE_GPL_ONLY, | |
169 | } licence; | |
170 | bool unused; | |
ad9546c9 RR |
171 | }; |
172 | ||
dafd0940 RR |
173 | static bool each_symbol_in_section(const struct symsearch *arr, |
174 | unsigned int arrsize, | |
175 | struct module *owner, | |
176 | bool (*fn)(const struct symsearch *syms, | |
177 | struct module *owner, | |
178 | unsigned int symnum, void *data), | |
179 | void *data) | |
ad9546c9 | 180 | { |
dafd0940 | 181 | unsigned int i, j; |
ad9546c9 | 182 | |
dafd0940 RR |
183 | for (j = 0; j < arrsize; j++) { |
184 | for (i = 0; i < arr[j].stop - arr[j].start; i++) | |
185 | if (fn(&arr[j], owner, i, data)) | |
186 | return true; | |
f71d20e9 | 187 | } |
dafd0940 RR |
188 | |
189 | return false; | |
ad9546c9 RR |
190 | } |
191 | ||
dafd0940 RR |
192 | /* Returns true as soon as fn returns true, otherwise false. */ |
193 | static bool each_symbol(bool (*fn)(const struct symsearch *arr, | |
194 | struct module *owner, | |
195 | unsigned int symnum, void *data), | |
196 | void *data) | |
ad9546c9 RR |
197 | { |
198 | struct module *mod; | |
ad9546c9 RR |
199 | const struct symsearch arr[] = { |
200 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, | |
dafd0940 | 201 | NOT_GPL_ONLY, false }, |
ad9546c9 | 202 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
203 | __start___kcrctab_gpl, |
204 | GPL_ONLY, false }, | |
ad9546c9 | 205 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
206 | __start___kcrctab_gpl_future, |
207 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 208 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 209 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
210 | __start___kcrctab_unused, |
211 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 212 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
213 | __start___kcrctab_unused_gpl, |
214 | GPL_ONLY, true }, | |
f7f5b675 | 215 | #endif |
ad9546c9 | 216 | }; |
f71d20e9 | 217 | |
dafd0940 RR |
218 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
219 | return true; | |
f71d20e9 | 220 | |
1da177e4 | 221 | list_for_each_entry(mod, &modules, list) { |
ad9546c9 RR |
222 | struct symsearch arr[] = { |
223 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 224 | NOT_GPL_ONLY, false }, |
ad9546c9 | 225 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
226 | mod->gpl_crcs, |
227 | GPL_ONLY, false }, | |
ad9546c9 RR |
228 | { mod->gpl_future_syms, |
229 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
230 | mod->gpl_future_crcs, |
231 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 232 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
233 | { mod->unused_syms, |
234 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
235 | mod->unused_crcs, |
236 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
237 | { mod->unused_gpl_syms, |
238 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
239 | mod->unused_gpl_crcs, |
240 | GPL_ONLY, true }, | |
f7f5b675 | 241 | #endif |
ad9546c9 RR |
242 | }; |
243 | ||
dafd0940 RR |
244 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
245 | return true; | |
246 | } | |
247 | return false; | |
248 | } | |
249 | ||
250 | struct find_symbol_arg { | |
251 | /* Input */ | |
252 | const char *name; | |
253 | bool gplok; | |
254 | bool warn; | |
255 | ||
256 | /* Output */ | |
257 | struct module *owner; | |
258 | const unsigned long *crc; | |
259 | unsigned long value; | |
260 | }; | |
261 | ||
262 | static bool find_symbol_in_section(const struct symsearch *syms, | |
263 | struct module *owner, | |
264 | unsigned int symnum, void *data) | |
265 | { | |
266 | struct find_symbol_arg *fsa = data; | |
267 | ||
268 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) | |
269 | return false; | |
270 | ||
271 | if (!fsa->gplok) { | |
272 | if (syms->licence == GPL_ONLY) | |
273 | return false; | |
274 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
275 | printk(KERN_WARNING "Symbol %s is being used " | |
276 | "by a non-GPL module, which will not " | |
277 | "be allowed in the future\n", fsa->name); | |
278 | printk(KERN_WARNING "Please see the file " | |
279 | "Documentation/feature-removal-schedule.txt " | |
280 | "in the kernel source tree for more details.\n"); | |
9f28bb7e | 281 | } |
1da177e4 | 282 | } |
ad9546c9 | 283 | |
f7f5b675 | 284 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
285 | if (syms->unused && fsa->warn) { |
286 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
287 | "however this module is using it.\n", fsa->name); | |
288 | printk(KERN_WARNING | |
289 | "This symbol will go away in the future.\n"); | |
290 | printk(KERN_WARNING | |
291 | "Please evalute if this is the right api to use and if " | |
292 | "it really is, submit a report the linux kernel " | |
293 | "mailinglist together with submitting your code for " | |
294 | "inclusion.\n"); | |
295 | } | |
f7f5b675 | 296 | #endif |
dafd0940 RR |
297 | |
298 | fsa->owner = owner; | |
299 | fsa->crc = symversion(syms->crcs, symnum); | |
300 | fsa->value = syms->start[symnum].value; | |
301 | return true; | |
302 | } | |
303 | ||
304 | /* Find a symbol, return value, (optional) crc and (optional) module | |
305 | * which owns it */ | |
306 | static unsigned long find_symbol(const char *name, | |
307 | struct module **owner, | |
308 | const unsigned long **crc, | |
309 | bool gplok, | |
310 | bool warn) | |
311 | { | |
312 | struct find_symbol_arg fsa; | |
313 | ||
314 | fsa.name = name; | |
315 | fsa.gplok = gplok; | |
316 | fsa.warn = warn; | |
317 | ||
318 | if (each_symbol(find_symbol_in_section, &fsa)) { | |
319 | if (owner) | |
320 | *owner = fsa.owner; | |
321 | if (crc) | |
322 | *crc = fsa.crc; | |
323 | return fsa.value; | |
324 | } | |
325 | ||
1da177e4 | 326 | DEBUGP("Failed to find symbol %s\n", name); |
88173507 | 327 | return -ENOENT; |
1da177e4 LT |
328 | } |
329 | ||
1da177e4 LT |
330 | /* Search for module by name: must hold module_mutex. */ |
331 | static struct module *find_module(const char *name) | |
332 | { | |
333 | struct module *mod; | |
334 | ||
335 | list_for_each_entry(mod, &modules, list) { | |
336 | if (strcmp(mod->name, name) == 0) | |
337 | return mod; | |
338 | } | |
339 | return NULL; | |
340 | } | |
341 | ||
342 | #ifdef CONFIG_SMP | |
343 | /* Number of blocks used and allocated. */ | |
344 | static unsigned int pcpu_num_used, pcpu_num_allocated; | |
345 | /* Size of each block. -ve means used. */ | |
346 | static int *pcpu_size; | |
347 | ||
348 | static int split_block(unsigned int i, unsigned short size) | |
349 | { | |
350 | /* Reallocation required? */ | |
351 | if (pcpu_num_used + 1 > pcpu_num_allocated) { | |
6d4f9c55 PE |
352 | int *new; |
353 | ||
354 | new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, | |
355 | GFP_KERNEL); | |
1da177e4 LT |
356 | if (!new) |
357 | return 0; | |
358 | ||
1da177e4 | 359 | pcpu_num_allocated *= 2; |
1da177e4 LT |
360 | pcpu_size = new; |
361 | } | |
362 | ||
363 | /* Insert a new subblock */ | |
364 | memmove(&pcpu_size[i+1], &pcpu_size[i], | |
365 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); | |
366 | pcpu_num_used++; | |
367 | ||
368 | pcpu_size[i+1] -= size; | |
369 | pcpu_size[i] = size; | |
370 | return 1; | |
371 | } | |
372 | ||
373 | static inline unsigned int block_size(int val) | |
374 | { | |
375 | if (val < 0) | |
376 | return -val; | |
377 | return val; | |
378 | } | |
379 | ||
842bbaaa RR |
380 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
381 | const char *name) | |
1da177e4 LT |
382 | { |
383 | unsigned long extra; | |
384 | unsigned int i; | |
385 | void *ptr; | |
386 | ||
b6e3590f JF |
387 | if (align > PAGE_SIZE) { |
388 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
389 | name, align, PAGE_SIZE); | |
390 | align = PAGE_SIZE; | |
842bbaaa | 391 | } |
1da177e4 LT |
392 | |
393 | ptr = __per_cpu_start; | |
394 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
395 | /* Extra for alignment requirement. */ | |
396 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; | |
397 | BUG_ON(i == 0 && extra != 0); | |
398 | ||
399 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) | |
400 | continue; | |
401 | ||
402 | /* Transfer extra to previous block. */ | |
403 | if (pcpu_size[i-1] < 0) | |
404 | pcpu_size[i-1] -= extra; | |
405 | else | |
406 | pcpu_size[i-1] += extra; | |
407 | pcpu_size[i] -= extra; | |
408 | ptr += extra; | |
409 | ||
410 | /* Split block if warranted */ | |
411 | if (pcpu_size[i] - size > sizeof(unsigned long)) | |
412 | if (!split_block(i, size)) | |
413 | return NULL; | |
414 | ||
415 | /* Mark allocated */ | |
416 | pcpu_size[i] = -pcpu_size[i]; | |
417 | return ptr; | |
418 | } | |
419 | ||
420 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", | |
421 | size); | |
422 | return NULL; | |
423 | } | |
424 | ||
425 | static void percpu_modfree(void *freeme) | |
426 | { | |
427 | unsigned int i; | |
428 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); | |
429 | ||
430 | /* First entry is core kernel percpu data. */ | |
431 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { | |
432 | if (ptr == freeme) { | |
433 | pcpu_size[i] = -pcpu_size[i]; | |
434 | goto free; | |
435 | } | |
436 | } | |
437 | BUG(); | |
438 | ||
439 | free: | |
440 | /* Merge with previous? */ | |
441 | if (pcpu_size[i-1] >= 0) { | |
442 | pcpu_size[i-1] += pcpu_size[i]; | |
443 | pcpu_num_used--; | |
444 | memmove(&pcpu_size[i], &pcpu_size[i+1], | |
445 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); | |
446 | i--; | |
447 | } | |
448 | /* Merge with next? */ | |
449 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { | |
450 | pcpu_size[i] += pcpu_size[i+1]; | |
451 | pcpu_num_used--; | |
452 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], | |
453 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); | |
454 | } | |
455 | } | |
456 | ||
457 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
458 | Elf_Shdr *sechdrs, | |
459 | const char *secstrings) | |
460 | { | |
461 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); | |
462 | } | |
463 | ||
dd5af90a MT |
464 | static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size) |
465 | { | |
466 | int cpu; | |
467 | ||
468 | for_each_possible_cpu(cpu) | |
469 | memcpy(pcpudest + per_cpu_offset(cpu), from, size); | |
470 | } | |
471 | ||
1da177e4 LT |
472 | static int percpu_modinit(void) |
473 | { | |
474 | pcpu_num_used = 2; | |
475 | pcpu_num_allocated = 2; | |
476 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, | |
477 | GFP_KERNEL); | |
478 | /* Static in-kernel percpu data (used). */ | |
b00742d3 | 479 | pcpu_size[0] = -(__per_cpu_end-__per_cpu_start); |
1da177e4 LT |
480 | /* Free room. */ |
481 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; | |
482 | if (pcpu_size[1] < 0) { | |
483 | printk(KERN_ERR "No per-cpu room for modules.\n"); | |
484 | pcpu_num_used = 1; | |
485 | } | |
486 | ||
487 | return 0; | |
22a8bdeb | 488 | } |
1da177e4 LT |
489 | __initcall(percpu_modinit); |
490 | #else /* ... !CONFIG_SMP */ | |
842bbaaa RR |
491 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
492 | const char *name) | |
1da177e4 LT |
493 | { |
494 | return NULL; | |
495 | } | |
496 | static inline void percpu_modfree(void *pcpuptr) | |
497 | { | |
498 | BUG(); | |
499 | } | |
500 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, | |
501 | Elf_Shdr *sechdrs, | |
502 | const char *secstrings) | |
503 | { | |
504 | return 0; | |
505 | } | |
506 | static inline void percpu_modcopy(void *pcpudst, const void *src, | |
507 | unsigned long size) | |
508 | { | |
509 | /* pcpusec should be 0, and size of that section should be 0. */ | |
510 | BUG_ON(size != 0); | |
511 | } | |
512 | #endif /* CONFIG_SMP */ | |
513 | ||
c988d2b2 MD |
514 | #define MODINFO_ATTR(field) \ |
515 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
516 | { \ | |
517 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
518 | } \ | |
519 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
520 | struct module *mod, char *buffer) \ | |
521 | { \ | |
522 | return sprintf(buffer, "%s\n", mod->field); \ | |
523 | } \ | |
524 | static int modinfo_##field##_exists(struct module *mod) \ | |
525 | { \ | |
526 | return mod->field != NULL; \ | |
527 | } \ | |
528 | static void free_modinfo_##field(struct module *mod) \ | |
529 | { \ | |
22a8bdeb DW |
530 | kfree(mod->field); \ |
531 | mod->field = NULL; \ | |
c988d2b2 MD |
532 | } \ |
533 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 534 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
535 | .show = show_modinfo_##field, \ |
536 | .setup = setup_modinfo_##field, \ | |
537 | .test = modinfo_##field##_exists, \ | |
538 | .free = free_modinfo_##field, \ | |
539 | }; | |
540 | ||
541 | MODINFO_ATTR(version); | |
542 | MODINFO_ATTR(srcversion); | |
543 | ||
e14af7ee AV |
544 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
545 | ||
03e88ae1 | 546 | #ifdef CONFIG_MODULE_UNLOAD |
1da177e4 LT |
547 | /* Init the unload section of the module. */ |
548 | static void module_unload_init(struct module *mod) | |
549 | { | |
550 | unsigned int i; | |
551 | ||
552 | INIT_LIST_HEAD(&mod->modules_which_use_me); | |
553 | for (i = 0; i < NR_CPUS; i++) | |
554 | local_set(&mod->ref[i].count, 0); | |
555 | /* Hold reference count during initialization. */ | |
39c715b7 | 556 | local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
1da177e4 LT |
557 | /* Backwards compatibility macros put refcount during init. */ |
558 | mod->waiter = current; | |
559 | } | |
560 | ||
561 | /* modules using other modules */ | |
562 | struct module_use | |
563 | { | |
564 | struct list_head list; | |
565 | struct module *module_which_uses; | |
566 | }; | |
567 | ||
568 | /* Does a already use b? */ | |
569 | static int already_uses(struct module *a, struct module *b) | |
570 | { | |
571 | struct module_use *use; | |
572 | ||
573 | list_for_each_entry(use, &b->modules_which_use_me, list) { | |
574 | if (use->module_which_uses == a) { | |
575 | DEBUGP("%s uses %s!\n", a->name, b->name); | |
576 | return 1; | |
577 | } | |
578 | } | |
579 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
580 | return 0; | |
581 | } | |
582 | ||
583 | /* Module a uses b */ | |
584 | static int use_module(struct module *a, struct module *b) | |
585 | { | |
586 | struct module_use *use; | |
c9a3ba55 | 587 | int no_warn, err; |
270a6c4c | 588 | |
1da177e4 LT |
589 | if (b == NULL || already_uses(a, b)) return 1; |
590 | ||
c9a3ba55 RR |
591 | /* If we're interrupted or time out, we fail. */ |
592 | if (wait_event_interruptible_timeout( | |
593 | module_wq, (err = strong_try_module_get(b)) != -EBUSY, | |
594 | 30 * HZ) <= 0) { | |
595 | printk("%s: gave up waiting for init of module %s.\n", | |
596 | a->name, b->name); | |
597 | return 0; | |
598 | } | |
599 | ||
600 | /* If strong_try_module_get() returned a different error, we fail. */ | |
601 | if (err) | |
1da177e4 LT |
602 | return 0; |
603 | ||
604 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
605 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
606 | if (!use) { | |
607 | printk("%s: out of memory loading\n", a->name); | |
608 | module_put(b); | |
609 | return 0; | |
610 | } | |
611 | ||
612 | use->module_which_uses = a; | |
613 | list_add(&use->list, &b->modules_which_use_me); | |
270a6c4c | 614 | no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
1da177e4 LT |
615 | return 1; |
616 | } | |
617 | ||
618 | /* Clear the unload stuff of the module. */ | |
619 | static void module_unload_free(struct module *mod) | |
620 | { | |
621 | struct module *i; | |
622 | ||
623 | list_for_each_entry(i, &modules, list) { | |
624 | struct module_use *use; | |
625 | ||
626 | list_for_each_entry(use, &i->modules_which_use_me, list) { | |
627 | if (use->module_which_uses == mod) { | |
628 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
629 | module_put(i); | |
630 | list_del(&use->list); | |
631 | kfree(use); | |
270a6c4c | 632 | sysfs_remove_link(i->holders_dir, mod->name); |
1da177e4 LT |
633 | /* There can be at most one match. */ |
634 | break; | |
635 | } | |
636 | } | |
637 | } | |
638 | } | |
639 | ||
640 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 641 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
642 | { |
643 | int ret = (flags & O_TRUNC); | |
644 | if (ret) | |
fb169793 | 645 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
646 | return ret; |
647 | } | |
648 | #else | |
fb169793 | 649 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
650 | { |
651 | return 0; | |
652 | } | |
653 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
654 | ||
655 | struct stopref | |
656 | { | |
657 | struct module *mod; | |
658 | int flags; | |
659 | int *forced; | |
660 | }; | |
661 | ||
662 | /* Whole machine is stopped with interrupts off when this runs. */ | |
663 | static int __try_stop_module(void *_sref) | |
664 | { | |
665 | struct stopref *sref = _sref; | |
666 | ||
da39ba5e RR |
667 | /* If it's not unused, quit unless we're forcing. */ |
668 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 669 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
670 | return -EWOULDBLOCK; |
671 | } | |
672 | ||
673 | /* Mark it as dying. */ | |
674 | sref->mod->state = MODULE_STATE_GOING; | |
675 | return 0; | |
676 | } | |
677 | ||
678 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
679 | { | |
da39ba5e RR |
680 | if (flags & O_NONBLOCK) { |
681 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 682 | |
9b1a4d38 | 683 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
684 | } else { |
685 | /* We don't need to stop the machine for this. */ | |
686 | mod->state = MODULE_STATE_GOING; | |
687 | synchronize_sched(); | |
688 | return 0; | |
689 | } | |
1da177e4 LT |
690 | } |
691 | ||
692 | unsigned int module_refcount(struct module *mod) | |
693 | { | |
694 | unsigned int i, total = 0; | |
695 | ||
696 | for (i = 0; i < NR_CPUS; i++) | |
697 | total += local_read(&mod->ref[i].count); | |
698 | return total; | |
699 | } | |
700 | EXPORT_SYMBOL(module_refcount); | |
701 | ||
702 | /* This exists whether we can unload or not */ | |
703 | static void free_module(struct module *mod); | |
704 | ||
705 | static void wait_for_zero_refcount(struct module *mod) | |
706 | { | |
a6550207 | 707 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 708 | mutex_unlock(&module_mutex); |
1da177e4 LT |
709 | for (;;) { |
710 | DEBUGP("Looking at refcount...\n"); | |
711 | set_current_state(TASK_UNINTERRUPTIBLE); | |
712 | if (module_refcount(mod) == 0) | |
713 | break; | |
714 | schedule(); | |
715 | } | |
716 | current->state = TASK_RUNNING; | |
6389a385 | 717 | mutex_lock(&module_mutex); |
1da177e4 LT |
718 | } |
719 | ||
dfff0a06 GKH |
720 | asmlinkage long |
721 | sys_delete_module(const char __user *name_user, unsigned int flags) | |
1da177e4 LT |
722 | { |
723 | struct module *mod; | |
dfff0a06 | 724 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
725 | int ret, forced = 0; |
726 | ||
dfff0a06 GKH |
727 | if (!capable(CAP_SYS_MODULE)) |
728 | return -EPERM; | |
729 | ||
730 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
731 | return -EFAULT; | |
732 | name[MODULE_NAME_LEN-1] = '\0'; | |
733 | ||
6389a385 | 734 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
735 | return -EINTR; |
736 | ||
737 | mod = find_module(name); | |
738 | if (!mod) { | |
739 | ret = -ENOENT; | |
740 | goto out; | |
741 | } | |
742 | ||
743 | if (!list_empty(&mod->modules_which_use_me)) { | |
744 | /* Other modules depend on us: get rid of them first. */ | |
745 | ret = -EWOULDBLOCK; | |
746 | goto out; | |
747 | } | |
748 | ||
749 | /* Doing init or already dying? */ | |
750 | if (mod->state != MODULE_STATE_LIVE) { | |
751 | /* FIXME: if (force), slam module count and wake up | |
752 | waiter --RR */ | |
753 | DEBUGP("%s already dying\n", mod->name); | |
754 | ret = -EBUSY; | |
755 | goto out; | |
756 | } | |
757 | ||
758 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 759 | if (mod->init && !mod->exit) { |
fb169793 | 760 | forced = try_force_unload(flags); |
1da177e4 LT |
761 | if (!forced) { |
762 | /* This module can't be removed */ | |
763 | ret = -EBUSY; | |
764 | goto out; | |
765 | } | |
766 | } | |
767 | ||
768 | /* Set this up before setting mod->state */ | |
769 | mod->waiter = current; | |
770 | ||
771 | /* Stop the machine so refcounts can't move and disable module. */ | |
772 | ret = try_stop_module(mod, flags, &forced); | |
773 | if (ret != 0) | |
774 | goto out; | |
775 | ||
776 | /* Never wait if forced. */ | |
777 | if (!forced && module_refcount(mod) != 0) | |
778 | wait_for_zero_refcount(mod); | |
779 | ||
df4b565e | 780 | mutex_unlock(&module_mutex); |
1da177e4 | 781 | /* Final destruction now noone is using it. */ |
df4b565e | 782 | if (mod->exit != NULL) |
1da177e4 | 783 | mod->exit(); |
df4b565e PO |
784 | blocking_notifier_call_chain(&module_notify_list, |
785 | MODULE_STATE_GOING, mod); | |
786 | mutex_lock(&module_mutex); | |
e14af7ee | 787 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 788 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
346e15be | 789 | unregister_dynamic_debug_module(mod->name); |
1da177e4 LT |
790 | free_module(mod); |
791 | ||
792 | out: | |
6389a385 | 793 | mutex_unlock(&module_mutex); |
1da177e4 LT |
794 | return ret; |
795 | } | |
796 | ||
797 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
798 | { | |
799 | struct module_use *use; | |
800 | int printed_something = 0; | |
801 | ||
802 | seq_printf(m, " %u ", module_refcount(mod)); | |
803 | ||
804 | /* Always include a trailing , so userspace can differentiate | |
805 | between this and the old multi-field proc format. */ | |
806 | list_for_each_entry(use, &mod->modules_which_use_me, list) { | |
807 | printed_something = 1; | |
808 | seq_printf(m, "%s,", use->module_which_uses->name); | |
809 | } | |
810 | ||
1da177e4 LT |
811 | if (mod->init != NULL && mod->exit == NULL) { |
812 | printed_something = 1; | |
813 | seq_printf(m, "[permanent],"); | |
814 | } | |
815 | ||
816 | if (!printed_something) | |
817 | seq_printf(m, "-"); | |
818 | } | |
819 | ||
820 | void __symbol_put(const char *symbol) | |
821 | { | |
822 | struct module *owner; | |
1da177e4 | 823 | |
24da1cbf | 824 | preempt_disable(); |
ad9546c9 | 825 | if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false))) |
1da177e4 LT |
826 | BUG(); |
827 | module_put(owner); | |
24da1cbf | 828 | preempt_enable(); |
1da177e4 LT |
829 | } |
830 | EXPORT_SYMBOL(__symbol_put); | |
831 | ||
832 | void symbol_put_addr(void *addr) | |
833 | { | |
5e376613 | 834 | struct module *modaddr; |
1da177e4 | 835 | |
5e376613 TP |
836 | if (core_kernel_text((unsigned long)addr)) |
837 | return; | |
1da177e4 | 838 | |
5e376613 TP |
839 | if (!(modaddr = module_text_address((unsigned long)addr))) |
840 | BUG(); | |
841 | module_put(modaddr); | |
1da177e4 LT |
842 | } |
843 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
844 | ||
845 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
846 | struct module *mod, char *buffer) | |
847 | { | |
256e2fdf | 848 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
849 | } |
850 | ||
851 | static struct module_attribute refcnt = { | |
7b595756 | 852 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
853 | .show = show_refcnt, |
854 | }; | |
855 | ||
f6a57033 AV |
856 | void module_put(struct module *module) |
857 | { | |
858 | if (module) { | |
859 | unsigned int cpu = get_cpu(); | |
860 | local_dec(&module->ref[cpu].count); | |
861 | /* Maybe they're waiting for us to drop reference? */ | |
862 | if (unlikely(!module_is_live(module))) | |
863 | wake_up_process(module->waiter); | |
864 | put_cpu(); | |
865 | } | |
866 | } | |
867 | EXPORT_SYMBOL(module_put); | |
868 | ||
1da177e4 LT |
869 | #else /* !CONFIG_MODULE_UNLOAD */ |
870 | static void print_unload_info(struct seq_file *m, struct module *mod) | |
871 | { | |
872 | /* We don't know the usage count, or what modules are using. */ | |
873 | seq_printf(m, " - -"); | |
874 | } | |
875 | ||
876 | static inline void module_unload_free(struct module *mod) | |
877 | { | |
878 | } | |
879 | ||
880 | static inline int use_module(struct module *a, struct module *b) | |
881 | { | |
c9a3ba55 | 882 | return strong_try_module_get(b) == 0; |
1da177e4 LT |
883 | } |
884 | ||
885 | static inline void module_unload_init(struct module *mod) | |
886 | { | |
887 | } | |
888 | #endif /* CONFIG_MODULE_UNLOAD */ | |
889 | ||
1f71740a KS |
890 | static ssize_t show_initstate(struct module_attribute *mattr, |
891 | struct module *mod, char *buffer) | |
892 | { | |
893 | const char *state = "unknown"; | |
894 | ||
895 | switch (mod->state) { | |
896 | case MODULE_STATE_LIVE: | |
897 | state = "live"; | |
898 | break; | |
899 | case MODULE_STATE_COMING: | |
900 | state = "coming"; | |
901 | break; | |
902 | case MODULE_STATE_GOING: | |
903 | state = "going"; | |
904 | break; | |
905 | } | |
906 | return sprintf(buffer, "%s\n", state); | |
907 | } | |
908 | ||
909 | static struct module_attribute initstate = { | |
7b595756 | 910 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
911 | .show = show_initstate, |
912 | }; | |
913 | ||
03e88ae1 GKH |
914 | static struct module_attribute *modinfo_attrs[] = { |
915 | &modinfo_version, | |
916 | &modinfo_srcversion, | |
1f71740a | 917 | &initstate, |
03e88ae1 GKH |
918 | #ifdef CONFIG_MODULE_UNLOAD |
919 | &refcnt, | |
920 | #endif | |
921 | NULL, | |
922 | }; | |
923 | ||
1da177e4 LT |
924 | static const char vermagic[] = VERMAGIC_STRING; |
925 | ||
826e4506 LT |
926 | static int try_to_force_load(struct module *mod, const char *symname) |
927 | { | |
928 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 929 | if (!test_taint(TAINT_FORCED_MODULE)) |
826e4506 LT |
930 | printk("%s: no version for \"%s\" found: kernel tainted.\n", |
931 | mod->name, symname); | |
932 | add_taint_module(mod, TAINT_FORCED_MODULE); | |
933 | return 0; | |
934 | #else | |
935 | return -ENOEXEC; | |
936 | #endif | |
937 | } | |
938 | ||
1da177e4 LT |
939 | #ifdef CONFIG_MODVERSIONS |
940 | static int check_version(Elf_Shdr *sechdrs, | |
941 | unsigned int versindex, | |
942 | const char *symname, | |
943 | struct module *mod, | |
944 | const unsigned long *crc) | |
945 | { | |
946 | unsigned int i, num_versions; | |
947 | struct modversion_info *versions; | |
948 | ||
949 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
950 | if (!crc) | |
951 | return 1; | |
952 | ||
a5dd6970 RR |
953 | /* No versions at all? modprobe --force does this. */ |
954 | if (versindex == 0) | |
955 | return try_to_force_load(mod, symname) == 0; | |
956 | ||
1da177e4 LT |
957 | versions = (void *) sechdrs[versindex].sh_addr; |
958 | num_versions = sechdrs[versindex].sh_size | |
959 | / sizeof(struct modversion_info); | |
960 | ||
961 | for (i = 0; i < num_versions; i++) { | |
962 | if (strcmp(versions[i].name, symname) != 0) | |
963 | continue; | |
964 | ||
965 | if (versions[i].crc == *crc) | |
966 | return 1; | |
1da177e4 LT |
967 | DEBUGP("Found checksum %lX vs module %lX\n", |
968 | *crc, versions[i].crc); | |
826e4506 | 969 | goto bad_version; |
1da177e4 | 970 | } |
826e4506 | 971 | |
a5dd6970 RR |
972 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
973 | mod->name, symname); | |
974 | return 0; | |
826e4506 LT |
975 | |
976 | bad_version: | |
977 | printk("%s: disagrees about version of symbol %s\n", | |
978 | mod->name, symname); | |
979 | return 0; | |
1da177e4 LT |
980 | } |
981 | ||
982 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
983 | unsigned int versindex, | |
984 | struct module *mod) | |
985 | { | |
986 | const unsigned long *crc; | |
1da177e4 | 987 | |
ad9546c9 | 988 | if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false))) |
1da177e4 | 989 | BUG(); |
ad9546c9 | 990 | return check_version(sechdrs, versindex, "struct_module", mod, crc); |
1da177e4 LT |
991 | } |
992 | ||
91e37a79 RR |
993 | /* First part is kernel version, which we ignore if module has crcs. */ |
994 | static inline int same_magic(const char *amagic, const char *bmagic, | |
995 | bool has_crcs) | |
1da177e4 | 996 | { |
91e37a79 RR |
997 | if (has_crcs) { |
998 | amagic += strcspn(amagic, " "); | |
999 | bmagic += strcspn(bmagic, " "); | |
1000 | } | |
1da177e4 LT |
1001 | return strcmp(amagic, bmagic) == 0; |
1002 | } | |
1003 | #else | |
1004 | static inline int check_version(Elf_Shdr *sechdrs, | |
1005 | unsigned int versindex, | |
1006 | const char *symname, | |
1007 | struct module *mod, | |
1008 | const unsigned long *crc) | |
1009 | { | |
1010 | return 1; | |
1011 | } | |
1012 | ||
1013 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1014 | unsigned int versindex, | |
1015 | struct module *mod) | |
1016 | { | |
1017 | return 1; | |
1018 | } | |
1019 | ||
91e37a79 RR |
1020 | static inline int same_magic(const char *amagic, const char *bmagic, |
1021 | bool has_crcs) | |
1da177e4 LT |
1022 | { |
1023 | return strcmp(amagic, bmagic) == 0; | |
1024 | } | |
1025 | #endif /* CONFIG_MODVERSIONS */ | |
1026 | ||
1027 | /* Resolve a symbol for this module. I.e. if we find one, record usage. | |
1028 | Must be holding module_mutex. */ | |
1029 | static unsigned long resolve_symbol(Elf_Shdr *sechdrs, | |
1030 | unsigned int versindex, | |
1031 | const char *name, | |
1032 | struct module *mod) | |
1033 | { | |
1034 | struct module *owner; | |
1035 | unsigned long ret; | |
1036 | const unsigned long *crc; | |
1037 | ||
ad9546c9 | 1038 | ret = find_symbol(name, &owner, &crc, |
25ddbb18 | 1039 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
88173507 | 1040 | if (!IS_ERR_VALUE(ret)) { |
9a4b9708 ML |
1041 | /* use_module can fail due to OOM, |
1042 | or module initialization or unloading */ | |
1da177e4 LT |
1043 | if (!check_version(sechdrs, versindex, name, mod, crc) || |
1044 | !use_module(mod, owner)) | |
88173507 | 1045 | ret = -EINVAL; |
1da177e4 | 1046 | } |
1da177e4 LT |
1047 | return ret; |
1048 | } | |
1049 | ||
1da177e4 LT |
1050 | /* |
1051 | * /sys/module/foo/sections stuff | |
1052 | * J. Corbet <corbet@lwn.net> | |
1053 | */ | |
120fc3d7 | 1054 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
a58730c4 RR |
1055 | struct module_sect_attr |
1056 | { | |
1057 | struct module_attribute mattr; | |
1058 | char *name; | |
1059 | unsigned long address; | |
1060 | }; | |
1061 | ||
1062 | struct module_sect_attrs | |
1063 | { | |
1064 | struct attribute_group grp; | |
1065 | unsigned int nsections; | |
1066 | struct module_sect_attr attrs[0]; | |
1067 | }; | |
1068 | ||
1da177e4 LT |
1069 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1070 | struct module *mod, char *buf) | |
1071 | { | |
1072 | struct module_sect_attr *sattr = | |
1073 | container_of(mattr, struct module_sect_attr, mattr); | |
1074 | return sprintf(buf, "0x%lx\n", sattr->address); | |
1075 | } | |
1076 | ||
04b1db9f IN |
1077 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1078 | { | |
a58730c4 | 1079 | unsigned int section; |
04b1db9f IN |
1080 | |
1081 | for (section = 0; section < sect_attrs->nsections; section++) | |
1082 | kfree(sect_attrs->attrs[section].name); | |
1083 | kfree(sect_attrs); | |
1084 | } | |
1085 | ||
1da177e4 LT |
1086 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
1087 | char *secstrings, Elf_Shdr *sechdrs) | |
1088 | { | |
1089 | unsigned int nloaded = 0, i, size[2]; | |
1090 | struct module_sect_attrs *sect_attrs; | |
1091 | struct module_sect_attr *sattr; | |
1092 | struct attribute **gattr; | |
22a8bdeb | 1093 | |
1da177e4 LT |
1094 | /* Count loaded sections and allocate structures */ |
1095 | for (i = 0; i < nsect; i++) | |
1096 | if (sechdrs[i].sh_flags & SHF_ALLOC) | |
1097 | nloaded++; | |
1098 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1099 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1100 | sizeof(sect_attrs->grp.attrs[0])); | |
1101 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1102 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1103 | if (sect_attrs == NULL) | |
1da177e4 LT |
1104 | return; |
1105 | ||
1106 | /* Setup section attributes. */ | |
1107 | sect_attrs->grp.name = "sections"; | |
1108 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1109 | ||
04b1db9f | 1110 | sect_attrs->nsections = 0; |
1da177e4 LT |
1111 | sattr = §_attrs->attrs[0]; |
1112 | gattr = §_attrs->grp.attrs[0]; | |
1113 | for (i = 0; i < nsect; i++) { | |
1114 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) | |
1115 | continue; | |
1116 | sattr->address = sechdrs[i].sh_addr; | |
04b1db9f IN |
1117 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
1118 | GFP_KERNEL); | |
1119 | if (sattr->name == NULL) | |
1120 | goto out; | |
1121 | sect_attrs->nsections++; | |
1da177e4 LT |
1122 | sattr->mattr.show = module_sect_show; |
1123 | sattr->mattr.store = NULL; | |
1124 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1125 | sattr->mattr.attr.mode = S_IRUGO; |
1126 | *(gattr++) = &(sattr++)->mattr.attr; | |
1127 | } | |
1128 | *gattr = NULL; | |
1129 | ||
1130 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1131 | goto out; | |
1132 | ||
1133 | mod->sect_attrs = sect_attrs; | |
1134 | return; | |
1135 | out: | |
04b1db9f | 1136 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1137 | } |
1138 | ||
1139 | static void remove_sect_attrs(struct module *mod) | |
1140 | { | |
1141 | if (mod->sect_attrs) { | |
1142 | sysfs_remove_group(&mod->mkobj.kobj, | |
1143 | &mod->sect_attrs->grp); | |
1144 | /* We are positive that no one is using any sect attrs | |
1145 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1146 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1147 | mod->sect_attrs = NULL; |
1148 | } | |
1149 | } | |
1150 | ||
6d760133 RM |
1151 | /* |
1152 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1153 | */ | |
1154 | ||
1155 | struct module_notes_attrs { | |
1156 | struct kobject *dir; | |
1157 | unsigned int notes; | |
1158 | struct bin_attribute attrs[0]; | |
1159 | }; | |
1160 | ||
1161 | static ssize_t module_notes_read(struct kobject *kobj, | |
1162 | struct bin_attribute *bin_attr, | |
1163 | char *buf, loff_t pos, size_t count) | |
1164 | { | |
1165 | /* | |
1166 | * The caller checked the pos and count against our size. | |
1167 | */ | |
1168 | memcpy(buf, bin_attr->private + pos, count); | |
1169 | return count; | |
1170 | } | |
1171 | ||
1172 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1173 | unsigned int i) | |
1174 | { | |
1175 | if (notes_attrs->dir) { | |
1176 | while (i-- > 0) | |
1177 | sysfs_remove_bin_file(notes_attrs->dir, | |
1178 | ¬es_attrs->attrs[i]); | |
e9432093 | 1179 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1180 | } |
1181 | kfree(notes_attrs); | |
1182 | } | |
1183 | ||
1184 | static void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1185 | char *secstrings, Elf_Shdr *sechdrs) | |
1186 | { | |
1187 | unsigned int notes, loaded, i; | |
1188 | struct module_notes_attrs *notes_attrs; | |
1189 | struct bin_attribute *nattr; | |
1190 | ||
1191 | /* Count notes sections and allocate structures. */ | |
1192 | notes = 0; | |
1193 | for (i = 0; i < nsect; i++) | |
1194 | if ((sechdrs[i].sh_flags & SHF_ALLOC) && | |
1195 | (sechdrs[i].sh_type == SHT_NOTE)) | |
1196 | ++notes; | |
1197 | ||
1198 | if (notes == 0) | |
1199 | return; | |
1200 | ||
1201 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1202 | + notes * sizeof(notes_attrs->attrs[0]), | |
1203 | GFP_KERNEL); | |
1204 | if (notes_attrs == NULL) | |
1205 | return; | |
1206 | ||
1207 | notes_attrs->notes = notes; | |
1208 | nattr = ¬es_attrs->attrs[0]; | |
1209 | for (loaded = i = 0; i < nsect; ++i) { | |
1210 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
1211 | continue; | |
1212 | if (sechdrs[i].sh_type == SHT_NOTE) { | |
1213 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; | |
1214 | nattr->attr.mode = S_IRUGO; | |
1215 | nattr->size = sechdrs[i].sh_size; | |
1216 | nattr->private = (void *) sechdrs[i].sh_addr; | |
1217 | nattr->read = module_notes_read; | |
1218 | ++nattr; | |
1219 | } | |
1220 | ++loaded; | |
1221 | } | |
1222 | ||
4ff6abff | 1223 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1224 | if (!notes_attrs->dir) |
1225 | goto out; | |
1226 | ||
1227 | for (i = 0; i < notes; ++i) | |
1228 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1229 | ¬es_attrs->attrs[i])) | |
1230 | goto out; | |
1231 | ||
1232 | mod->notes_attrs = notes_attrs; | |
1233 | return; | |
1234 | ||
1235 | out: | |
1236 | free_notes_attrs(notes_attrs, i); | |
1237 | } | |
1238 | ||
1239 | static void remove_notes_attrs(struct module *mod) | |
1240 | { | |
1241 | if (mod->notes_attrs) | |
1242 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1243 | } | |
1244 | ||
1da177e4 | 1245 | #else |
04b1db9f | 1246 | |
1da177e4 LT |
1247 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
1248 | char *sectstrings, Elf_Shdr *sechdrs) | |
1249 | { | |
1250 | } | |
1251 | ||
1252 | static inline void remove_sect_attrs(struct module *mod) | |
1253 | { | |
1254 | } | |
6d760133 RM |
1255 | |
1256 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, | |
1257 | char *sectstrings, Elf_Shdr *sechdrs) | |
1258 | { | |
1259 | } | |
1260 | ||
1261 | static inline void remove_notes_attrs(struct module *mod) | |
1262 | { | |
1263 | } | |
120fc3d7 | 1264 | #endif |
1da177e4 | 1265 | |
ef665c1a RD |
1266 | #ifdef CONFIG_SYSFS |
1267 | int module_add_modinfo_attrs(struct module *mod) | |
c988d2b2 MD |
1268 | { |
1269 | struct module_attribute *attr; | |
03e88ae1 | 1270 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1271 | int error = 0; |
1272 | int i; | |
1273 | ||
03e88ae1 GKH |
1274 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1275 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1276 | GFP_KERNEL); | |
1277 | if (!mod->modinfo_attrs) | |
1278 | return -ENOMEM; | |
1279 | ||
1280 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1281 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1282 | if (!attr->test || | |
03e88ae1 GKH |
1283 | (attr->test && attr->test(mod))) { |
1284 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
03e88ae1 GKH |
1285 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1286 | ++temp_attr; | |
1287 | } | |
c988d2b2 MD |
1288 | } |
1289 | return error; | |
1290 | } | |
1291 | ||
ef665c1a | 1292 | void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1293 | { |
1294 | struct module_attribute *attr; | |
1295 | int i; | |
1296 | ||
03e88ae1 GKH |
1297 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1298 | /* pick a field to test for end of list */ | |
1299 | if (!attr->attr.name) | |
1300 | break; | |
c988d2b2 | 1301 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1302 | if (attr->free) |
1303 | attr->free(mod); | |
c988d2b2 | 1304 | } |
03e88ae1 | 1305 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1306 | } |
1da177e4 | 1307 | |
ef665c1a | 1308 | int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1309 | { |
1310 | int err; | |
6494a93d | 1311 | struct kobject *kobj; |
1da177e4 | 1312 | |
823bccfc GKH |
1313 | if (!module_sysfs_initialized) { |
1314 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1315 | mod->name); |
1316 | err = -EINVAL; | |
1317 | goto out; | |
1318 | } | |
6494a93d GKH |
1319 | |
1320 | kobj = kset_find_obj(module_kset, mod->name); | |
1321 | if (kobj) { | |
1322 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1323 | kobject_put(kobj); | |
1324 | err = -EINVAL; | |
1325 | goto out; | |
1326 | } | |
1327 | ||
1da177e4 | 1328 | mod->mkobj.mod = mod; |
e17e0f51 | 1329 | |
ac3c8141 GKH |
1330 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1331 | mod->mkobj.kobj.kset = module_kset; | |
1332 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1333 | "%s", mod->name); | |
1334 | if (err) | |
1335 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1336 | |
97c146ef | 1337 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1338 | out: |
1339 | return err; | |
1340 | } | |
1341 | ||
ef665c1a | 1342 | int mod_sysfs_setup(struct module *mod, |
270a6c4c KS |
1343 | struct kernel_param *kparam, |
1344 | unsigned int num_params) | |
1345 | { | |
1346 | int err; | |
1347 | ||
4ff6abff | 1348 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1349 | if (!mod->holders_dir) { |
1350 | err = -ENOMEM; | |
270a6c4c | 1351 | goto out_unreg; |
240936e1 | 1352 | } |
270a6c4c | 1353 | |
1da177e4 LT |
1354 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1355 | if (err) | |
270a6c4c | 1356 | goto out_unreg_holders; |
1da177e4 | 1357 | |
c988d2b2 MD |
1358 | err = module_add_modinfo_attrs(mod); |
1359 | if (err) | |
e17e0f51 | 1360 | goto out_unreg_param; |
c988d2b2 | 1361 | |
e17e0f51 | 1362 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1363 | return 0; |
1364 | ||
e17e0f51 KS |
1365 | out_unreg_param: |
1366 | module_param_sysfs_remove(mod); | |
270a6c4c | 1367 | out_unreg_holders: |
78a2d906 | 1368 | kobject_put(mod->holders_dir); |
270a6c4c | 1369 | out_unreg: |
e17e0f51 | 1370 | kobject_put(&mod->mkobj.kobj); |
1da177e4 LT |
1371 | return err; |
1372 | } | |
34e4e2fe DL |
1373 | |
1374 | static void mod_sysfs_fini(struct module *mod) | |
1375 | { | |
1376 | kobject_put(&mod->mkobj.kobj); | |
1377 | } | |
1378 | ||
1379 | #else /* CONFIG_SYSFS */ | |
1380 | ||
1381 | static void mod_sysfs_fini(struct module *mod) | |
1382 | { | |
1383 | } | |
1384 | ||
1385 | #endif /* CONFIG_SYSFS */ | |
1da177e4 LT |
1386 | |
1387 | static void mod_kobject_remove(struct module *mod) | |
1388 | { | |
c988d2b2 | 1389 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1390 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1391 | kobject_put(mod->mkobj.drivers_dir); |
1392 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1393 | mod_sysfs_fini(mod); |
1da177e4 LT |
1394 | } |
1395 | ||
bb9d3d56 RR |
1396 | /* |
1397 | * link the module with the whole machine is stopped with interrupts off | |
1398 | * - this defends against kallsyms not taking locks | |
1399 | */ | |
1400 | static int __link_module(void *_mod) | |
1401 | { | |
1402 | struct module *mod = _mod; | |
1403 | list_add(&mod->list, &modules); | |
1404 | return 0; | |
1405 | } | |
1406 | ||
1da177e4 LT |
1407 | /* |
1408 | * unlink the module with the whole machine is stopped with interrupts off | |
1409 | * - this defends against kallsyms not taking locks | |
1410 | */ | |
1411 | static int __unlink_module(void *_mod) | |
1412 | { | |
1413 | struct module *mod = _mod; | |
1414 | list_del(&mod->list); | |
1415 | return 0; | |
1416 | } | |
1417 | ||
02a3e59a | 1418 | /* Free a module, remove from lists, etc (must hold module_mutex). */ |
1da177e4 LT |
1419 | static void free_module(struct module *mod) |
1420 | { | |
1421 | /* Delete from various lists */ | |
9b1a4d38 | 1422 | stop_machine(__unlink_module, mod, NULL); |
6d760133 | 1423 | remove_notes_attrs(mod); |
1da177e4 LT |
1424 | remove_sect_attrs(mod); |
1425 | mod_kobject_remove(mod); | |
1426 | ||
4552d5dc JB |
1427 | unwind_remove_table(mod->unwind_info, 0); |
1428 | ||
1da177e4 LT |
1429 | /* Arch-specific cleanup. */ |
1430 | module_arch_cleanup(mod); | |
1431 | ||
1432 | /* Module unload stuff */ | |
1433 | module_unload_free(mod); | |
1434 | ||
fed1939c SR |
1435 | /* release any pointers to mcount in this module */ |
1436 | ftrace_release(mod->module_core, mod->core_size); | |
1437 | ||
1da177e4 LT |
1438 | /* This may be NULL, but that's OK */ |
1439 | module_free(mod, mod->module_init); | |
1440 | kfree(mod->args); | |
1441 | if (mod->percpu) | |
1442 | percpu_modfree(mod->percpu); | |
1443 | ||
fbb9ce95 IM |
1444 | /* Free lock-classes: */ |
1445 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1446 | ||
1da177e4 LT |
1447 | /* Finally, free the core (containing the module structure) */ |
1448 | module_free(mod, mod->module_core); | |
1449 | } | |
1450 | ||
1451 | void *__symbol_get(const char *symbol) | |
1452 | { | |
1453 | struct module *owner; | |
24da1cbf | 1454 | unsigned long value; |
1da177e4 | 1455 | |
24da1cbf | 1456 | preempt_disable(); |
ad9546c9 | 1457 | value = find_symbol(symbol, &owner, NULL, true, true); |
88173507 CL |
1458 | if (IS_ERR_VALUE(value)) |
1459 | value = 0; | |
1460 | else if (strong_try_module_get(owner)) | |
1da177e4 | 1461 | value = 0; |
24da1cbf | 1462 | preempt_enable(); |
1da177e4 LT |
1463 | |
1464 | return (void *)value; | |
1465 | } | |
1466 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1467 | ||
eea8b54d AN |
1468 | /* |
1469 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1470 | * in the kernel or in some other module's exported symbol table. |
eea8b54d AN |
1471 | */ |
1472 | static int verify_export_symbols(struct module *mod) | |
1473 | { | |
b211104d | 1474 | unsigned int i; |
eea8b54d | 1475 | struct module *owner; |
b211104d RR |
1476 | const struct kernel_symbol *s; |
1477 | struct { | |
1478 | const struct kernel_symbol *sym; | |
1479 | unsigned int num; | |
1480 | } arr[] = { | |
1481 | { mod->syms, mod->num_syms }, | |
1482 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1483 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1484 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1485 | { mod->unused_syms, mod->num_unused_syms }, |
1486 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1487 | #endif |
b211104d | 1488 | }; |
eea8b54d | 1489 | |
b211104d RR |
1490 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1491 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
1492 | if (!IS_ERR_VALUE(find_symbol(s->name, &owner, | |
1493 | NULL, true, false))) { | |
1494 | printk(KERN_ERR | |
1495 | "%s: exports duplicate symbol %s" | |
1496 | " (owned by %s)\n", | |
1497 | mod->name, s->name, module_name(owner)); | |
1498 | return -ENOEXEC; | |
1499 | } | |
eea8b54d | 1500 | } |
b211104d RR |
1501 | } |
1502 | return 0; | |
eea8b54d AN |
1503 | } |
1504 | ||
9a4b9708 | 1505 | /* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4 LT |
1506 | static int simplify_symbols(Elf_Shdr *sechdrs, |
1507 | unsigned int symindex, | |
1508 | const char *strtab, | |
1509 | unsigned int versindex, | |
1510 | unsigned int pcpuindex, | |
1511 | struct module *mod) | |
1512 | { | |
1513 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; | |
1514 | unsigned long secbase; | |
1515 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1516 | int ret = 0; | |
1517 | ||
1518 | for (i = 1; i < n; i++) { | |
1519 | switch (sym[i].st_shndx) { | |
1520 | case SHN_COMMON: | |
1521 | /* We compiled with -fno-common. These are not | |
1522 | supposed to happen. */ | |
1523 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); | |
1524 | printk("%s: please compile with -fno-common\n", | |
1525 | mod->name); | |
1526 | ret = -ENOEXEC; | |
1527 | break; | |
1528 | ||
1529 | case SHN_ABS: | |
1530 | /* Don't need to do anything */ | |
1531 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1532 | (long)sym[i].st_value); | |
1533 | break; | |
1534 | ||
1535 | case SHN_UNDEF: | |
1536 | sym[i].st_value | |
1537 | = resolve_symbol(sechdrs, versindex, | |
1538 | strtab + sym[i].st_name, mod); | |
1539 | ||
1540 | /* Ok if resolved. */ | |
88173507 | 1541 | if (!IS_ERR_VALUE(sym[i].st_value)) |
1da177e4 LT |
1542 | break; |
1543 | /* Ok if weak. */ | |
1544 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) | |
1545 | break; | |
1546 | ||
1547 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
1548 | mod->name, strtab + sym[i].st_name); | |
1549 | ret = -ENOENT; | |
1550 | break; | |
1551 | ||
1552 | default: | |
1553 | /* Divert to percpu allocation if a percpu var. */ | |
1554 | if (sym[i].st_shndx == pcpuindex) | |
1555 | secbase = (unsigned long)mod->percpu; | |
1556 | else | |
1557 | secbase = sechdrs[sym[i].st_shndx].sh_addr; | |
1558 | sym[i].st_value += secbase; | |
1559 | break; | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | return ret; | |
1564 | } | |
1565 | ||
1566 | /* Update size with this section: return offset. */ | |
2f0f2a33 | 1567 | static long get_offset(unsigned int *size, Elf_Shdr *sechdr) |
1da177e4 LT |
1568 | { |
1569 | long ret; | |
1570 | ||
1571 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); | |
1572 | *size = ret + sechdr->sh_size; | |
1573 | return ret; | |
1574 | } | |
1575 | ||
1576 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1577 | might -- code, read-only data, read-write data, small data. Tally | |
1578 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1579 | belongs in init. */ | |
1580 | static void layout_sections(struct module *mod, | |
1581 | const Elf_Ehdr *hdr, | |
1582 | Elf_Shdr *sechdrs, | |
1583 | const char *secstrings) | |
1584 | { | |
1585 | static unsigned long const masks[][2] = { | |
1586 | /* NOTE: all executable code must be the first section | |
1587 | * in this array; otherwise modify the text_size | |
1588 | * finder in the two loops below */ | |
1589 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1590 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1591 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1592 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1593 | }; | |
1594 | unsigned int m, i; | |
1595 | ||
1596 | for (i = 0; i < hdr->e_shnum; i++) | |
1597 | sechdrs[i].sh_entsize = ~0UL; | |
1598 | ||
1599 | DEBUGP("Core section allocation order:\n"); | |
1600 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1601 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1602 | Elf_Shdr *s = &sechdrs[i]; | |
1603 | ||
1604 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1605 | || (s->sh_flags & masks[m][1]) | |
1606 | || s->sh_entsize != ~0UL | |
1607 | || strncmp(secstrings + s->sh_name, | |
1608 | ".init", 5) == 0) | |
1609 | continue; | |
1610 | s->sh_entsize = get_offset(&mod->core_size, s); | |
1611 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1612 | } | |
1613 | if (m == 0) | |
1614 | mod->core_text_size = mod->core_size; | |
1615 | } | |
1616 | ||
1617 | DEBUGP("Init section allocation order:\n"); | |
1618 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
1619 | for (i = 0; i < hdr->e_shnum; ++i) { | |
1620 | Elf_Shdr *s = &sechdrs[i]; | |
1621 | ||
1622 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1623 | || (s->sh_flags & masks[m][1]) | |
1624 | || s->sh_entsize != ~0UL | |
1625 | || strncmp(secstrings + s->sh_name, | |
1626 | ".init", 5) != 0) | |
1627 | continue; | |
1628 | s->sh_entsize = (get_offset(&mod->init_size, s) | |
1629 | | INIT_OFFSET_MASK); | |
1630 | DEBUGP("\t%s\n", secstrings + s->sh_name); | |
1631 | } | |
1632 | if (m == 0) | |
1633 | mod->init_text_size = mod->init_size; | |
1634 | } | |
1635 | } | |
1636 | ||
1da177e4 LT |
1637 | static void set_license(struct module *mod, const char *license) |
1638 | { | |
1639 | if (!license) | |
1640 | license = "unspecified"; | |
1641 | ||
fa3ba2e8 | 1642 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1643 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 1644 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1645 | "kernel.\n", mod->name, license); |
1646 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1647 | } |
1648 | } | |
1649 | ||
1650 | /* Parse tag=value strings from .modinfo section */ | |
1651 | static char *next_string(char *string, unsigned long *secsize) | |
1652 | { | |
1653 | /* Skip non-zero chars */ | |
1654 | while (string[0]) { | |
1655 | string++; | |
1656 | if ((*secsize)-- <= 1) | |
1657 | return NULL; | |
1658 | } | |
1659 | ||
1660 | /* Skip any zero padding. */ | |
1661 | while (!string[0]) { | |
1662 | string++; | |
1663 | if ((*secsize)-- <= 1) | |
1664 | return NULL; | |
1665 | } | |
1666 | return string; | |
1667 | } | |
1668 | ||
1669 | static char *get_modinfo(Elf_Shdr *sechdrs, | |
1670 | unsigned int info, | |
1671 | const char *tag) | |
1672 | { | |
1673 | char *p; | |
1674 | unsigned int taglen = strlen(tag); | |
1675 | unsigned long size = sechdrs[info].sh_size; | |
1676 | ||
1677 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { | |
1678 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
1679 | return p + taglen + 1; | |
1680 | } | |
1681 | return NULL; | |
1682 | } | |
1683 | ||
c988d2b2 MD |
1684 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
1685 | unsigned int infoindex) | |
1686 | { | |
1687 | struct module_attribute *attr; | |
1688 | int i; | |
1689 | ||
1690 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1691 | if (attr->setup) | |
1692 | attr->setup(mod, | |
1693 | get_modinfo(sechdrs, | |
1694 | infoindex, | |
1695 | attr->attr.name)); | |
1696 | } | |
1697 | } | |
c988d2b2 | 1698 | |
1da177e4 | 1699 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
1700 | |
1701 | /* lookup symbol in given range of kernel_symbols */ | |
1702 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
1703 | const struct kernel_symbol *start, | |
1704 | const struct kernel_symbol *stop) | |
1705 | { | |
1706 | const struct kernel_symbol *ks = start; | |
1707 | for (; ks < stop; ks++) | |
1708 | if (strcmp(ks->name, name) == 0) | |
1709 | return ks; | |
1710 | return NULL; | |
1711 | } | |
1712 | ||
ea07890a | 1713 | static int is_exported(const char *name, const struct module *mod) |
1da177e4 | 1714 | { |
3fd6805f SR |
1715 | if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) |
1716 | return 1; | |
1717 | else | |
f867d2a2 | 1718 | if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) |
1da177e4 | 1719 | return 1; |
3fd6805f SR |
1720 | else |
1721 | return 0; | |
1da177e4 LT |
1722 | } |
1723 | ||
1724 | /* As per nm */ | |
1725 | static char elf_type(const Elf_Sym *sym, | |
1726 | Elf_Shdr *sechdrs, | |
1727 | const char *secstrings, | |
1728 | struct module *mod) | |
1729 | { | |
1730 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { | |
1731 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
1732 | return 'v'; | |
1733 | else | |
1734 | return 'w'; | |
1735 | } | |
1736 | if (sym->st_shndx == SHN_UNDEF) | |
1737 | return 'U'; | |
1738 | if (sym->st_shndx == SHN_ABS) | |
1739 | return 'a'; | |
1740 | if (sym->st_shndx >= SHN_LORESERVE) | |
1741 | return '?'; | |
1742 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
1743 | return 't'; | |
1744 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
1745 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
1746 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
1747 | return 'r'; | |
1748 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1749 | return 'g'; | |
1750 | else | |
1751 | return 'd'; | |
1752 | } | |
1753 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
1754 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
1755 | return 's'; | |
1756 | else | |
1757 | return 'b'; | |
1758 | } | |
1759 | if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, | |
1760 | ".debug", strlen(".debug")) == 0) | |
1761 | return 'n'; | |
1762 | return '?'; | |
1763 | } | |
1764 | ||
1765 | static void add_kallsyms(struct module *mod, | |
1766 | Elf_Shdr *sechdrs, | |
1767 | unsigned int symindex, | |
1768 | unsigned int strindex, | |
1769 | const char *secstrings) | |
1770 | { | |
1771 | unsigned int i; | |
1772 | ||
1773 | mod->symtab = (void *)sechdrs[symindex].sh_addr; | |
1774 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); | |
1775 | mod->strtab = (void *)sechdrs[strindex].sh_addr; | |
1776 | ||
1777 | /* Set types up while we still have access to sections. */ | |
1778 | for (i = 0; i < mod->num_symtab; i++) | |
1779 | mod->symtab[i].st_info | |
1780 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); | |
1781 | } | |
1782 | #else | |
1783 | static inline void add_kallsyms(struct module *mod, | |
1784 | Elf_Shdr *sechdrs, | |
1785 | unsigned int symindex, | |
1786 | unsigned int strindex, | |
1787 | const char *secstrings) | |
1788 | { | |
1789 | } | |
1790 | #endif /* CONFIG_KALLSYMS */ | |
1791 | ||
346e15be JB |
1792 | #ifdef CONFIG_DYNAMIC_PRINTK_DEBUG |
1793 | static void dynamic_printk_setup(Elf_Shdr *sechdrs, unsigned int verboseindex) | |
1794 | { | |
1795 | struct mod_debug *debug_info; | |
1796 | unsigned long pos, end; | |
1797 | unsigned int num_verbose; | |
1798 | ||
1799 | pos = sechdrs[verboseindex].sh_addr; | |
1800 | num_verbose = sechdrs[verboseindex].sh_size / | |
1801 | sizeof(struct mod_debug); | |
1802 | end = pos + (num_verbose * sizeof(struct mod_debug)); | |
1803 | ||
1804 | for (; pos < end; pos += sizeof(struct mod_debug)) { | |
1805 | debug_info = (struct mod_debug *)pos; | |
1806 | register_dynamic_debug_module(debug_info->modname, | |
1807 | debug_info->type, debug_info->logical_modname, | |
1808 | debug_info->flag_names, debug_info->hash, | |
1809 | debug_info->hash2); | |
1810 | } | |
1811 | } | |
1812 | #else | |
1813 | static inline void dynamic_printk_setup(Elf_Shdr *sechdrs, | |
1814 | unsigned int verboseindex) | |
1815 | { | |
1816 | } | |
1817 | #endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */ | |
1818 | ||
3a642e99 RR |
1819 | static void *module_alloc_update_bounds(unsigned long size) |
1820 | { | |
1821 | void *ret = module_alloc(size); | |
1822 | ||
1823 | if (ret) { | |
1824 | /* Update module bounds. */ | |
1825 | if ((unsigned long)ret < module_addr_min) | |
1826 | module_addr_min = (unsigned long)ret; | |
1827 | if ((unsigned long)ret + size > module_addr_max) | |
1828 | module_addr_max = (unsigned long)ret + size; | |
1829 | } | |
1830 | return ret; | |
1831 | } | |
1832 | ||
1da177e4 LT |
1833 | /* Allocate and load the module: note that size of section 0 is always |
1834 | zero, and we rely on this for optional sections. */ | |
ffb4ba76 | 1835 | static noinline struct module *load_module(void __user *umod, |
1da177e4 LT |
1836 | unsigned long len, |
1837 | const char __user *uargs) | |
1838 | { | |
1839 | Elf_Ehdr *hdr; | |
1840 | Elf_Shdr *sechdrs; | |
1841 | char *secstrings, *args, *modmagic, *strtab = NULL; | |
061b1bd3 | 1842 | char *staging; |
84860f99 AM |
1843 | unsigned int i; |
1844 | unsigned int symindex = 0; | |
1845 | unsigned int strindex = 0; | |
1846 | unsigned int setupindex; | |
1847 | unsigned int exindex; | |
1848 | unsigned int exportindex; | |
1849 | unsigned int modindex; | |
1850 | unsigned int obsparmindex; | |
1851 | unsigned int infoindex; | |
1852 | unsigned int gplindex; | |
1853 | unsigned int crcindex; | |
1854 | unsigned int gplcrcindex; | |
1855 | unsigned int versindex; | |
1856 | unsigned int pcpuindex; | |
1857 | unsigned int gplfutureindex; | |
1858 | unsigned int gplfuturecrcindex; | |
1859 | unsigned int unwindex = 0; | |
f7f5b675 | 1860 | #ifdef CONFIG_UNUSED_SYMBOLS |
84860f99 AM |
1861 | unsigned int unusedindex; |
1862 | unsigned int unusedcrcindex; | |
1863 | unsigned int unusedgplindex; | |
1864 | unsigned int unusedgplcrcindex; | |
f7f5b675 | 1865 | #endif |
8256e47c MD |
1866 | unsigned int markersindex; |
1867 | unsigned int markersstringsindex; | |
346e15be | 1868 | unsigned int verboseindex; |
97e1c18e MD |
1869 | unsigned int tracepointsindex; |
1870 | unsigned int tracepointsstringsindex; | |
90d595fe | 1871 | unsigned int mcountindex; |
1da177e4 LT |
1872 | struct module *mod; |
1873 | long err = 0; | |
1874 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ | |
fed1939c | 1875 | void *mseg; |
1da177e4 | 1876 | struct exception_table_entry *extable; |
378bac82 | 1877 | mm_segment_t old_fs; |
1da177e4 LT |
1878 | |
1879 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
1880 | umod, len, uargs); | |
1881 | if (len < sizeof(*hdr)) | |
1882 | return ERR_PTR(-ENOEXEC); | |
1883 | ||
1884 | /* Suck in entire file: we'll want most of it. */ | |
1885 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
1886 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) | |
1887 | return ERR_PTR(-ENOMEM); | |
1888 | if (copy_from_user(hdr, umod, len) != 0) { | |
1889 | err = -EFAULT; | |
1890 | goto free_hdr; | |
1891 | } | |
1892 | ||
1893 | /* Sanity checks against insmoding binaries or wrong arch, | |
1894 | weird elf version */ | |
c4ea6fcf | 1895 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
1da177e4 LT |
1896 | || hdr->e_type != ET_REL |
1897 | || !elf_check_arch(hdr) | |
1898 | || hdr->e_shentsize != sizeof(*sechdrs)) { | |
1899 | err = -ENOEXEC; | |
1900 | goto free_hdr; | |
1901 | } | |
1902 | ||
1903 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) | |
1904 | goto truncated; | |
1905 | ||
1906 | /* Convenience variables */ | |
1907 | sechdrs = (void *)hdr + hdr->e_shoff; | |
1908 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
1909 | sechdrs[0].sh_addr = 0; | |
1910 | ||
1911 | for (i = 1; i < hdr->e_shnum; i++) { | |
1912 | if (sechdrs[i].sh_type != SHT_NOBITS | |
1913 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) | |
1914 | goto truncated; | |
1915 | ||
1916 | /* Mark all sections sh_addr with their address in the | |
1917 | temporary image. */ | |
1918 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; | |
1919 | ||
1920 | /* Internal symbols and strings. */ | |
1921 | if (sechdrs[i].sh_type == SHT_SYMTAB) { | |
1922 | symindex = i; | |
1923 | strindex = sechdrs[i].sh_link; | |
1924 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; | |
1925 | } | |
1926 | #ifndef CONFIG_MODULE_UNLOAD | |
1927 | /* Don't load .exit sections */ | |
1928 | if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) | |
1929 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1930 | #endif | |
1931 | } | |
1932 | ||
1933 | modindex = find_sec(hdr, sechdrs, secstrings, | |
1934 | ".gnu.linkonce.this_module"); | |
1935 | if (!modindex) { | |
1936 | printk(KERN_WARNING "No module found in object\n"); | |
1937 | err = -ENOEXEC; | |
1938 | goto free_hdr; | |
1939 | } | |
1940 | mod = (void *)sechdrs[modindex].sh_addr; | |
1941 | ||
1942 | if (symindex == 0) { | |
1943 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
1944 | mod->name); | |
1945 | err = -ENOEXEC; | |
1946 | goto free_hdr; | |
1947 | } | |
1948 | ||
1949 | /* Optional sections */ | |
1950 | exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); | |
1951 | gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); | |
9f28bb7e | 1952 | gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future"); |
1da177e4 LT |
1953 | crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); |
1954 | gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); | |
9f28bb7e | 1955 | gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future"); |
f7f5b675 DV |
1956 | #ifdef CONFIG_UNUSED_SYMBOLS |
1957 | unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused"); | |
1958 | unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl"); | |
f71d20e9 AV |
1959 | unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused"); |
1960 | unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl"); | |
f7f5b675 | 1961 | #endif |
1da177e4 LT |
1962 | setupindex = find_sec(hdr, sechdrs, secstrings, "__param"); |
1963 | exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table"); | |
1964 | obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm"); | |
1965 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); | |
1966 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); | |
1967 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); | |
4552d5dc JB |
1968 | #ifdef ARCH_UNWIND_SECTION_NAME |
1969 | unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME); | |
1970 | #endif | |
1da177e4 | 1971 | |
ea01e798 | 1972 | /* Don't keep modinfo and version sections. */ |
1da177e4 | 1973 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
ea01e798 | 1974 | sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
1975 | #ifdef CONFIG_KALLSYMS |
1976 | /* Keep symbol and string tables for decoding later. */ | |
1977 | sechdrs[symindex].sh_flags |= SHF_ALLOC; | |
1978 | sechdrs[strindex].sh_flags |= SHF_ALLOC; | |
1979 | #endif | |
4552d5dc JB |
1980 | if (unwindex) |
1981 | sechdrs[unwindex].sh_flags |= SHF_ALLOC; | |
1da177e4 LT |
1982 | |
1983 | /* Check module struct version now, before we try to use module. */ | |
1984 | if (!check_modstruct_version(sechdrs, versindex, mod)) { | |
1985 | err = -ENOEXEC; | |
1986 | goto free_hdr; | |
1987 | } | |
1988 | ||
1989 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); | |
1990 | /* This is allowed: modprobe --force will invalidate it. */ | |
1991 | if (!modmagic) { | |
826e4506 LT |
1992 | err = try_to_force_load(mod, "magic"); |
1993 | if (err) | |
1994 | goto free_hdr; | |
91e37a79 | 1995 | } else if (!same_magic(modmagic, vermagic, versindex)) { |
1da177e4 LT |
1996 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
1997 | mod->name, modmagic, vermagic); | |
1998 | err = -ENOEXEC; | |
1999 | goto free_hdr; | |
2000 | } | |
2001 | ||
061b1bd3 GKH |
2002 | staging = get_modinfo(sechdrs, infoindex, "staging"); |
2003 | if (staging) { | |
2004 | add_taint_module(mod, TAINT_CRAP); | |
2005 | printk(KERN_WARNING "%s: module is from the staging directory," | |
2006 | " the quality is unknown, you have been warned.\n", | |
2007 | mod->name); | |
2008 | } | |
2009 | ||
1da177e4 | 2010 | /* Now copy in args */ |
24277dda DA |
2011 | args = strndup_user(uargs, ~0UL >> 1); |
2012 | if (IS_ERR(args)) { | |
2013 | err = PTR_ERR(args); | |
1da177e4 LT |
2014 | goto free_hdr; |
2015 | } | |
8e08b756 | 2016 | |
1da177e4 LT |
2017 | if (find_module(mod->name)) { |
2018 | err = -EEXIST; | |
2019 | goto free_mod; | |
2020 | } | |
2021 | ||
2022 | mod->state = MODULE_STATE_COMING; | |
2023 | ||
2024 | /* Allow arches to frob section contents and sizes. */ | |
2025 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); | |
2026 | if (err < 0) | |
2027 | goto free_mod; | |
2028 | ||
2029 | if (pcpuindex) { | |
2030 | /* We have a special allocation for this section. */ | |
2031 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, | |
842bbaaa RR |
2032 | sechdrs[pcpuindex].sh_addralign, |
2033 | mod->name); | |
1da177e4 LT |
2034 | if (!percpu) { |
2035 | err = -ENOMEM; | |
2036 | goto free_mod; | |
2037 | } | |
2038 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2039 | mod->percpu = percpu; | |
2040 | } | |
2041 | ||
2042 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2043 | this is done generically; there doesn't appear to be any | |
2044 | special cases for the architectures. */ | |
2045 | layout_sections(mod, hdr, sechdrs, secstrings); | |
2046 | ||
2047 | /* Do the allocs. */ | |
3a642e99 | 2048 | ptr = module_alloc_update_bounds(mod->core_size); |
1da177e4 LT |
2049 | if (!ptr) { |
2050 | err = -ENOMEM; | |
2051 | goto free_percpu; | |
2052 | } | |
2053 | memset(ptr, 0, mod->core_size); | |
2054 | mod->module_core = ptr; | |
2055 | ||
3a642e99 | 2056 | ptr = module_alloc_update_bounds(mod->init_size); |
1da177e4 LT |
2057 | if (!ptr && mod->init_size) { |
2058 | err = -ENOMEM; | |
2059 | goto free_core; | |
2060 | } | |
2061 | memset(ptr, 0, mod->init_size); | |
2062 | mod->module_init = ptr; | |
2063 | ||
2064 | /* Transfer each section which specifies SHF_ALLOC */ | |
2065 | DEBUGP("final section addresses:\n"); | |
2066 | for (i = 0; i < hdr->e_shnum; i++) { | |
2067 | void *dest; | |
2068 | ||
2069 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
2070 | continue; | |
2071 | ||
2072 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) | |
2073 | dest = mod->module_init | |
2074 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); | |
2075 | else | |
2076 | dest = mod->module_core + sechdrs[i].sh_entsize; | |
2077 | ||
2078 | if (sechdrs[i].sh_type != SHT_NOBITS) | |
2079 | memcpy(dest, (void *)sechdrs[i].sh_addr, | |
2080 | sechdrs[i].sh_size); | |
2081 | /* Update sh_addr to point to copy in image. */ | |
2082 | sechdrs[i].sh_addr = (unsigned long)dest; | |
2083 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); | |
2084 | } | |
2085 | /* Module has been moved. */ | |
2086 | mod = (void *)sechdrs[modindex].sh_addr; | |
2087 | ||
2088 | /* Now we've moved module, initialize linked lists, etc. */ | |
2089 | module_unload_init(mod); | |
2090 | ||
97c146ef | 2091 | /* add kobject, so we can reference it. */ |
d58ae678 AM |
2092 | err = mod_sysfs_init(mod); |
2093 | if (err) | |
97c146ef | 2094 | goto free_unload; |
270a6c4c | 2095 | |
1da177e4 LT |
2096 | /* Set up license info based on the info section */ |
2097 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); | |
2098 | ||
9b37ccfc PR |
2099 | /* |
2100 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2101 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2102 | * using GPL-only symbols it needs. | |
2103 | */ | |
fa3ba2e8 | 2104 | if (strcmp(mod->name, "ndiswrapper") == 0) |
9b37ccfc PR |
2105 | add_taint(TAINT_PROPRIETARY_MODULE); |
2106 | ||
2107 | /* driverloader was caught wrongly pretending to be under GPL */ | |
fa3ba2e8 FM |
2108 | if (strcmp(mod->name, "driverloader") == 0) |
2109 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
9841d61d | 2110 | |
c988d2b2 MD |
2111 | /* Set up MODINFO_ATTR fields */ |
2112 | setup_modinfo(mod, sechdrs, infoindex); | |
c988d2b2 | 2113 | |
1da177e4 LT |
2114 | /* Fix up syms, so that st_value is a pointer to location. */ |
2115 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, | |
2116 | mod); | |
2117 | if (err < 0) | |
2118 | goto cleanup; | |
2119 | ||
2120 | /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ | |
2121 | mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms); | |
2122 | mod->syms = (void *)sechdrs[exportindex].sh_addr; | |
2123 | if (crcindex) | |
2124 | mod->crcs = (void *)sechdrs[crcindex].sh_addr; | |
2125 | mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms); | |
2126 | mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr; | |
2127 | if (gplcrcindex) | |
2128 | mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr; | |
9f28bb7e GKH |
2129 | mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size / |
2130 | sizeof(*mod->gpl_future_syms); | |
2131 | mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr; | |
2132 | if (gplfuturecrcindex) | |
2133 | mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr; | |
1da177e4 | 2134 | |
f7f5b675 DV |
2135 | #ifdef CONFIG_UNUSED_SYMBOLS |
2136 | mod->num_unused_syms = sechdrs[unusedindex].sh_size / | |
2137 | sizeof(*mod->unused_syms); | |
2138 | mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size / | |
2139 | sizeof(*mod->unused_gpl_syms); | |
f71d20e9 AV |
2140 | mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr; |
2141 | if (unusedcrcindex) | |
2142 | mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr; | |
2143 | mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr; | |
2144 | if (unusedgplcrcindex) | |
4e2d9245 RR |
2145 | mod->unused_gpl_crcs |
2146 | = (void *)sechdrs[unusedgplcrcindex].sh_addr; | |
f7f5b675 | 2147 | #endif |
f71d20e9 | 2148 | |
1da177e4 | 2149 | #ifdef CONFIG_MODVERSIONS |
f7f5b675 DV |
2150 | if ((mod->num_syms && !crcindex) |
2151 | || (mod->num_gpl_syms && !gplcrcindex) | |
2152 | || (mod->num_gpl_future_syms && !gplfuturecrcindex) | |
2153 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2154 | || (mod->num_unused_syms && !unusedcrcindex) | |
2155 | || (mod->num_unused_gpl_syms && !unusedgplcrcindex) | |
2156 | #endif | |
2157 | ) { | |
826e4506 LT |
2158 | printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name); |
2159 | err = try_to_force_load(mod, "nocrc"); | |
2160 | if (err) | |
2161 | goto cleanup; | |
1da177e4 LT |
2162 | } |
2163 | #endif | |
8256e47c MD |
2164 | markersindex = find_sec(hdr, sechdrs, secstrings, "__markers"); |
2165 | markersstringsindex = find_sec(hdr, sechdrs, secstrings, | |
2166 | "__markers_strings"); | |
346e15be | 2167 | verboseindex = find_sec(hdr, sechdrs, secstrings, "__verbose"); |
97e1c18e MD |
2168 | tracepointsindex = find_sec(hdr, sechdrs, secstrings, "__tracepoints"); |
2169 | tracepointsstringsindex = find_sec(hdr, sechdrs, secstrings, | |
2170 | "__tracepoints_strings"); | |
1da177e4 | 2171 | |
90d595fe SR |
2172 | mcountindex = find_sec(hdr, sechdrs, secstrings, |
2173 | "__mcount_loc"); | |
1da177e4 LT |
2174 | |
2175 | /* Now do relocations. */ | |
2176 | for (i = 1; i < hdr->e_shnum; i++) { | |
2177 | const char *strtab = (char *)sechdrs[strindex].sh_addr; | |
2178 | unsigned int info = sechdrs[i].sh_info; | |
2179 | ||
2180 | /* Not a valid relocation section? */ | |
2181 | if (info >= hdr->e_shnum) | |
2182 | continue; | |
2183 | ||
2184 | /* Don't bother with non-allocated sections */ | |
2185 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) | |
2186 | continue; | |
2187 | ||
2188 | if (sechdrs[i].sh_type == SHT_REL) | |
2189 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); | |
2190 | else if (sechdrs[i].sh_type == SHT_RELA) | |
2191 | err = apply_relocate_add(sechdrs, strtab, symindex, i, | |
2192 | mod); | |
2193 | if (err < 0) | |
2194 | goto cleanup; | |
2195 | } | |
8256e47c MD |
2196 | #ifdef CONFIG_MARKERS |
2197 | mod->markers = (void *)sechdrs[markersindex].sh_addr; | |
2198 | mod->num_markers = | |
2199 | sechdrs[markersindex].sh_size / sizeof(*mod->markers); | |
2200 | #endif | |
97e1c18e MD |
2201 | #ifdef CONFIG_TRACEPOINTS |
2202 | mod->tracepoints = (void *)sechdrs[tracepointsindex].sh_addr; | |
2203 | mod->num_tracepoints = | |
2204 | sechdrs[tracepointsindex].sh_size / sizeof(*mod->tracepoints); | |
2205 | #endif | |
2206 | ||
1da177e4 | 2207 | |
eea8b54d AN |
2208 | /* Find duplicate symbols */ |
2209 | err = verify_export_symbols(mod); | |
2210 | ||
2211 | if (err < 0) | |
2212 | goto cleanup; | |
2213 | ||
1da177e4 LT |
2214 | /* Set up and sort exception table */ |
2215 | mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable); | |
2216 | mod->extable = extable = (void *)sechdrs[exindex].sh_addr; | |
2217 | sort_extable(extable, extable + mod->num_exentries); | |
2218 | ||
2219 | /* Finally, copy percpu area over. */ | |
2220 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, | |
2221 | sechdrs[pcpuindex].sh_size); | |
2222 | ||
2223 | add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); | |
2224 | ||
97e1c18e | 2225 | if (!mod->taints) { |
8256e47c | 2226 | #ifdef CONFIG_MARKERS |
8256e47c | 2227 | marker_update_probe_range(mod->markers, |
fb40bd78 | 2228 | mod->markers + mod->num_markers); |
8256e47c | 2229 | #endif |
346e15be | 2230 | dynamic_printk_setup(sechdrs, verboseindex); |
97e1c18e MD |
2231 | #ifdef CONFIG_TRACEPOINTS |
2232 | tracepoint_update_probe_range(mod->tracepoints, | |
2233 | mod->tracepoints + mod->num_tracepoints); | |
2234 | #endif | |
2235 | } | |
90d595fe | 2236 | |
fed1939c SR |
2237 | /* sechdrs[0].sh_size is always zero */ |
2238 | mseg = (void *)sechdrs[mcountindex].sh_addr; | |
2239 | ftrace_init_module(mseg, mseg + sechdrs[mcountindex].sh_size); | |
90d595fe | 2240 | |
1da177e4 LT |
2241 | err = module_finalize(hdr, sechdrs, mod); |
2242 | if (err < 0) | |
2243 | goto cleanup; | |
2244 | ||
378bac82 TK |
2245 | /* flush the icache in correct context */ |
2246 | old_fs = get_fs(); | |
2247 | set_fs(KERNEL_DS); | |
2248 | ||
2249 | /* | |
2250 | * Flush the instruction cache, since we've played with text. | |
2251 | * Do it before processing of module parameters, so the module | |
2252 | * can provide parameter accessor functions of its own. | |
2253 | */ | |
2254 | if (mod->module_init) | |
2255 | flush_icache_range((unsigned long)mod->module_init, | |
2256 | (unsigned long)mod->module_init | |
2257 | + mod->init_size); | |
2258 | flush_icache_range((unsigned long)mod->module_core, | |
2259 | (unsigned long)mod->module_core + mod->core_size); | |
2260 | ||
2261 | set_fs(old_fs); | |
2262 | ||
1da177e4 | 2263 | mod->args = args; |
8d3b33f6 RR |
2264 | if (obsparmindex) |
2265 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", | |
2266 | mod->name); | |
2267 | ||
bb9d3d56 RR |
2268 | /* Now sew it into the lists so we can get lockdep and oops |
2269 | * info during argument parsing. Noone should access us, since | |
2270 | * strong_try_module_get() will fail. */ | |
9b1a4d38 | 2271 | stop_machine(__link_module, mod, NULL); |
bb9d3d56 | 2272 | |
8d3b33f6 RR |
2273 | /* Size of section 0 is 0, so this works well if no params */ |
2274 | err = parse_args(mod->name, mod->args, | |
2275 | (struct kernel_param *) | |
2276 | sechdrs[setupindex].sh_addr, | |
2277 | sechdrs[setupindex].sh_size | |
2278 | / sizeof(struct kernel_param), | |
2279 | NULL); | |
1da177e4 | 2280 | if (err < 0) |
bb9d3d56 | 2281 | goto unlink; |
1da177e4 | 2282 | |
22a8bdeb | 2283 | err = mod_sysfs_setup(mod, |
1da177e4 LT |
2284 | (struct kernel_param *) |
2285 | sechdrs[setupindex].sh_addr, | |
2286 | sechdrs[setupindex].sh_size | |
2287 | / sizeof(struct kernel_param)); | |
2288 | if (err < 0) | |
bb9d3d56 | 2289 | goto unlink; |
1da177e4 | 2290 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
6d760133 | 2291 | add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
1da177e4 | 2292 | |
4552d5dc JB |
2293 | /* Size of section 0 is 0, so this works well if no unwind info. */ |
2294 | mod->unwind_info = unwind_add_table(mod, | |
22a8bdeb DW |
2295 | (void *)sechdrs[unwindex].sh_addr, |
2296 | sechdrs[unwindex].sh_size); | |
4552d5dc | 2297 | |
1da177e4 LT |
2298 | /* Get rid of temporary copy */ |
2299 | vfree(hdr); | |
2300 | ||
2301 | /* Done! */ | |
2302 | return mod; | |
2303 | ||
bb9d3d56 | 2304 | unlink: |
9b1a4d38 | 2305 | stop_machine(__unlink_module, mod, NULL); |
1da177e4 LT |
2306 | module_arch_cleanup(mod); |
2307 | cleanup: | |
97c146ef KS |
2308 | kobject_del(&mod->mkobj.kobj); |
2309 | kobject_put(&mod->mkobj.kobj); | |
fed1939c | 2310 | ftrace_release(mod->module_core, mod->core_size); |
97c146ef | 2311 | free_unload: |
1da177e4 LT |
2312 | module_unload_free(mod); |
2313 | module_free(mod, mod->module_init); | |
2314 | free_core: | |
2315 | module_free(mod, mod->module_core); | |
2316 | free_percpu: | |
2317 | if (percpu) | |
2318 | percpu_modfree(percpu); | |
2319 | free_mod: | |
2320 | kfree(args); | |
2321 | free_hdr: | |
2322 | vfree(hdr); | |
6fe2e70b | 2323 | return ERR_PTR(err); |
1da177e4 LT |
2324 | |
2325 | truncated: | |
2326 | printk(KERN_ERR "Module len %lu truncated\n", len); | |
2327 | err = -ENOEXEC; | |
2328 | goto free_hdr; | |
2329 | } | |
2330 | ||
1da177e4 LT |
2331 | /* This is where the real work happens */ |
2332 | asmlinkage long | |
2333 | sys_init_module(void __user *umod, | |
2334 | unsigned long len, | |
2335 | const char __user *uargs) | |
2336 | { | |
2337 | struct module *mod; | |
2338 | int ret = 0; | |
2339 | ||
2340 | /* Must have permission */ | |
2341 | if (!capable(CAP_SYS_MODULE)) | |
2342 | return -EPERM; | |
2343 | ||
2344 | /* Only one module load at a time, please */ | |
6389a385 | 2345 | if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4 LT |
2346 | return -EINTR; |
2347 | ||
2348 | /* Do all the hard work */ | |
2349 | mod = load_module(umod, len, uargs); | |
2350 | if (IS_ERR(mod)) { | |
6389a385 | 2351 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2352 | return PTR_ERR(mod); |
2353 | } | |
2354 | ||
1da177e4 | 2355 | /* Drop lock so they can recurse */ |
6389a385 | 2356 | mutex_unlock(&module_mutex); |
1da177e4 | 2357 | |
e041c683 AS |
2358 | blocking_notifier_call_chain(&module_notify_list, |
2359 | MODULE_STATE_COMING, mod); | |
1da177e4 LT |
2360 | |
2361 | /* Start the module */ | |
2362 | if (mod->init != NULL) | |
59f9415f | 2363 | ret = do_one_initcall(mod->init); |
1da177e4 LT |
2364 | if (ret < 0) { |
2365 | /* Init routine failed: abort. Try to protect us from | |
2366 | buggy refcounters. */ | |
2367 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2368 | synchronize_sched(); |
af49d924 | 2369 | module_put(mod); |
df4b565e PO |
2370 | blocking_notifier_call_chain(&module_notify_list, |
2371 | MODULE_STATE_GOING, mod); | |
af49d924 RR |
2372 | mutex_lock(&module_mutex); |
2373 | free_module(mod); | |
2374 | mutex_unlock(&module_mutex); | |
c9a3ba55 | 2375 | wake_up(&module_wq); |
1da177e4 LT |
2376 | return ret; |
2377 | } | |
e24e2e64 AD |
2378 | if (ret > 0) { |
2379 | printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, " | |
2380 | "it should follow 0/-E convention\n" | |
2381 | KERN_WARNING "%s: loading module anyway...\n", | |
2382 | __func__, mod->name, ret, | |
2383 | __func__); | |
2384 | dump_stack(); | |
2385 | } | |
1da177e4 | 2386 | |
6c5db22d | 2387 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 2388 | mod->state = MODULE_STATE_LIVE; |
6c5db22d RR |
2389 | wake_up(&module_wq); |
2390 | ||
2391 | mutex_lock(&module_mutex); | |
1da177e4 LT |
2392 | /* Drop initial reference. */ |
2393 | module_put(mod); | |
4552d5dc | 2394 | unwind_remove_table(mod->unwind_info, 1); |
1da177e4 LT |
2395 | module_free(mod, mod->module_init); |
2396 | mod->module_init = NULL; | |
2397 | mod->init_size = 0; | |
2398 | mod->init_text_size = 0; | |
6389a385 | 2399 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2400 | |
2401 | return 0; | |
2402 | } | |
2403 | ||
2404 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2405 | { | |
2406 | return ((void *)addr >= start && (void *)addr < start + size); | |
2407 | } | |
2408 | ||
2409 | #ifdef CONFIG_KALLSYMS | |
2410 | /* | |
2411 | * This ignores the intensely annoying "mapping symbols" found | |
2412 | * in ARM ELF files: $a, $t and $d. | |
2413 | */ | |
2414 | static inline int is_arm_mapping_symbol(const char *str) | |
2415 | { | |
22a8bdeb | 2416 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2417 | && (str[2] == '\0' || str[2] == '.'); |
2418 | } | |
2419 | ||
2420 | static const char *get_ksymbol(struct module *mod, | |
2421 | unsigned long addr, | |
2422 | unsigned long *size, | |
2423 | unsigned long *offset) | |
2424 | { | |
2425 | unsigned int i, best = 0; | |
2426 | unsigned long nextval; | |
2427 | ||
2428 | /* At worse, next value is at end of module */ | |
2429 | if (within(addr, mod->module_init, mod->init_size)) | |
2430 | nextval = (unsigned long)mod->module_init+mod->init_text_size; | |
22a8bdeb | 2431 | else |
1da177e4 LT |
2432 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2433 | ||
2434 | /* Scan for closest preceeding symbol, and next symbol. (ELF | |
22a8bdeb | 2435 | starts real symbols at 1). */ |
1da177e4 LT |
2436 | for (i = 1; i < mod->num_symtab; i++) { |
2437 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2438 | continue; | |
2439 | ||
2440 | /* We ignore unnamed symbols: they're uninformative | |
2441 | * and inserted at a whim. */ | |
2442 | if (mod->symtab[i].st_value <= addr | |
2443 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2444 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2445 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2446 | best = i; | |
2447 | if (mod->symtab[i].st_value > addr | |
2448 | && mod->symtab[i].st_value < nextval | |
2449 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2450 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2451 | nextval = mod->symtab[i].st_value; | |
2452 | } | |
2453 | ||
2454 | if (!best) | |
2455 | return NULL; | |
2456 | ||
ffb45122 AD |
2457 | if (size) |
2458 | *size = nextval - mod->symtab[best].st_value; | |
2459 | if (offset) | |
2460 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
2461 | return mod->strtab + mod->symtab[best].st_name; |
2462 | } | |
2463 | ||
6dd06c9f RR |
2464 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
2465 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 2466 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
2467 | unsigned long *size, |
2468 | unsigned long *offset, | |
2469 | char **modname, | |
2470 | char *namebuf) | |
1da177e4 LT |
2471 | { |
2472 | struct module *mod; | |
cb2a5205 | 2473 | const char *ret = NULL; |
1da177e4 | 2474 | |
cb2a5205 | 2475 | preempt_disable(); |
1da177e4 LT |
2476 | list_for_each_entry(mod, &modules, list) { |
2477 | if (within(addr, mod->module_init, mod->init_size) | |
2478 | || within(addr, mod->module_core, mod->core_size)) { | |
ffc50891 FBH |
2479 | if (modname) |
2480 | *modname = mod->name; | |
cb2a5205 RR |
2481 | ret = get_ksymbol(mod, addr, size, offset); |
2482 | break; | |
1da177e4 LT |
2483 | } |
2484 | } | |
6dd06c9f RR |
2485 | /* Make a copy in here where it's safe */ |
2486 | if (ret) { | |
2487 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
2488 | ret = namebuf; | |
2489 | } | |
cb2a5205 | 2490 | preempt_enable(); |
92dfc9dc | 2491 | return ret; |
1da177e4 LT |
2492 | } |
2493 | ||
9d65cb4a AD |
2494 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
2495 | { | |
2496 | struct module *mod; | |
2497 | ||
cb2a5205 | 2498 | preempt_disable(); |
9d65cb4a AD |
2499 | list_for_each_entry(mod, &modules, list) { |
2500 | if (within(addr, mod->module_init, mod->init_size) || | |
2501 | within(addr, mod->module_core, mod->core_size)) { | |
2502 | const char *sym; | |
2503 | ||
2504 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
2505 | if (!sym) | |
2506 | goto out; | |
9281acea | 2507 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 2508 | preempt_enable(); |
9d65cb4a AD |
2509 | return 0; |
2510 | } | |
2511 | } | |
2512 | out: | |
cb2a5205 | 2513 | preempt_enable(); |
9d65cb4a AD |
2514 | return -ERANGE; |
2515 | } | |
2516 | ||
a5c43dae AD |
2517 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
2518 | unsigned long *offset, char *modname, char *name) | |
2519 | { | |
2520 | struct module *mod; | |
2521 | ||
cb2a5205 | 2522 | preempt_disable(); |
a5c43dae AD |
2523 | list_for_each_entry(mod, &modules, list) { |
2524 | if (within(addr, mod->module_init, mod->init_size) || | |
2525 | within(addr, mod->module_core, mod->core_size)) { | |
2526 | const char *sym; | |
2527 | ||
2528 | sym = get_ksymbol(mod, addr, size, offset); | |
2529 | if (!sym) | |
2530 | goto out; | |
2531 | if (modname) | |
9281acea | 2532 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 2533 | if (name) |
9281acea | 2534 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 2535 | preempt_enable(); |
a5c43dae AD |
2536 | return 0; |
2537 | } | |
2538 | } | |
2539 | out: | |
cb2a5205 | 2540 | preempt_enable(); |
a5c43dae AD |
2541 | return -ERANGE; |
2542 | } | |
2543 | ||
ea07890a AD |
2544 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
2545 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
2546 | { |
2547 | struct module *mod; | |
2548 | ||
cb2a5205 | 2549 | preempt_disable(); |
1da177e4 LT |
2550 | list_for_each_entry(mod, &modules, list) { |
2551 | if (symnum < mod->num_symtab) { | |
2552 | *value = mod->symtab[symnum].st_value; | |
2553 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 2554 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
2555 | KSYM_NAME_LEN); |
2556 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ea07890a | 2557 | *exported = is_exported(name, mod); |
cb2a5205 | 2558 | preempt_enable(); |
ea07890a | 2559 | return 0; |
1da177e4 LT |
2560 | } |
2561 | symnum -= mod->num_symtab; | |
2562 | } | |
cb2a5205 | 2563 | preempt_enable(); |
ea07890a | 2564 | return -ERANGE; |
1da177e4 LT |
2565 | } |
2566 | ||
2567 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
2568 | { | |
2569 | unsigned int i; | |
2570 | ||
2571 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
2572 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
2573 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
2574 | return mod->symtab[i].st_value; |
2575 | return 0; | |
2576 | } | |
2577 | ||
2578 | /* Look for this name: can be of form module:name. */ | |
2579 | unsigned long module_kallsyms_lookup_name(const char *name) | |
2580 | { | |
2581 | struct module *mod; | |
2582 | char *colon; | |
2583 | unsigned long ret = 0; | |
2584 | ||
2585 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 2586 | preempt_disable(); |
1da177e4 LT |
2587 | if ((colon = strchr(name, ':')) != NULL) { |
2588 | *colon = '\0'; | |
2589 | if ((mod = find_module(name)) != NULL) | |
2590 | ret = mod_find_symname(mod, colon+1); | |
2591 | *colon = ':'; | |
2592 | } else { | |
2593 | list_for_each_entry(mod, &modules, list) | |
2594 | if ((ret = mod_find_symname(mod, name)) != 0) | |
2595 | break; | |
2596 | } | |
cb2a5205 | 2597 | preempt_enable(); |
1da177e4 LT |
2598 | return ret; |
2599 | } | |
2600 | #endif /* CONFIG_KALLSYMS */ | |
2601 | ||
2602 | /* Called by the /proc file system to return a list of modules. */ | |
2603 | static void *m_start(struct seq_file *m, loff_t *pos) | |
2604 | { | |
6389a385 | 2605 | mutex_lock(&module_mutex); |
708f4b52 | 2606 | return seq_list_start(&modules, *pos); |
1da177e4 LT |
2607 | } |
2608 | ||
2609 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
2610 | { | |
708f4b52 | 2611 | return seq_list_next(p, &modules, pos); |
1da177e4 LT |
2612 | } |
2613 | ||
2614 | static void m_stop(struct seq_file *m, void *p) | |
2615 | { | |
6389a385 | 2616 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2617 | } |
2618 | ||
21aa9280 | 2619 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
2620 | { |
2621 | int bx = 0; | |
2622 | ||
21aa9280 AV |
2623 | if (mod->taints || |
2624 | mod->state == MODULE_STATE_GOING || | |
2625 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 2626 | buf[bx++] = '('; |
25ddbb18 | 2627 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e8 | 2628 | buf[bx++] = 'P'; |
25ddbb18 | 2629 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e8 | 2630 | buf[bx++] = 'F'; |
26e9a397 | 2631 | if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd3 | 2632 | buf[bx++] = 'C'; |
fa3ba2e8 FM |
2633 | /* |
2634 | * TAINT_FORCED_RMMOD: could be added. | |
2635 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
2636 | * apply to modules. | |
2637 | */ | |
21aa9280 AV |
2638 | |
2639 | /* Show a - for module-is-being-unloaded */ | |
2640 | if (mod->state == MODULE_STATE_GOING) | |
2641 | buf[bx++] = '-'; | |
2642 | /* Show a + for module-is-being-loaded */ | |
2643 | if (mod->state == MODULE_STATE_COMING) | |
2644 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
2645 | buf[bx++] = ')'; |
2646 | } | |
2647 | buf[bx] = '\0'; | |
2648 | ||
2649 | return buf; | |
2650 | } | |
2651 | ||
1da177e4 LT |
2652 | static int m_show(struct seq_file *m, void *p) |
2653 | { | |
2654 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
2655 | char buf[8]; |
2656 | ||
2f0f2a33 | 2657 | seq_printf(m, "%s %u", |
1da177e4 LT |
2658 | mod->name, mod->init_size + mod->core_size); |
2659 | print_unload_info(m, mod); | |
2660 | ||
2661 | /* Informative for users. */ | |
2662 | seq_printf(m, " %s", | |
2663 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
2664 | mod->state == MODULE_STATE_COMING ? "Loading": | |
2665 | "Live"); | |
2666 | /* Used by oprofile and other similar tools. */ | |
2667 | seq_printf(m, " 0x%p", mod->module_core); | |
2668 | ||
fa3ba2e8 FM |
2669 | /* Taints info */ |
2670 | if (mod->taints) | |
21aa9280 | 2671 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 2672 | |
1da177e4 LT |
2673 | seq_printf(m, "\n"); |
2674 | return 0; | |
2675 | } | |
2676 | ||
2677 | /* Format: modulename size refcount deps address | |
2678 | ||
2679 | Where refcount is a number or -, and deps is a comma-separated list | |
2680 | of depends or -. | |
2681 | */ | |
15ad7cdc | 2682 | const struct seq_operations modules_op = { |
1da177e4 LT |
2683 | .start = m_start, |
2684 | .next = m_next, | |
2685 | .stop = m_stop, | |
2686 | .show = m_show | |
2687 | }; | |
2688 | ||
2689 | /* Given an address, look for it in the module exception tables. */ | |
2690 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2691 | { | |
1da177e4 LT |
2692 | const struct exception_table_entry *e = NULL; |
2693 | struct module *mod; | |
2694 | ||
24da1cbf | 2695 | preempt_disable(); |
1da177e4 LT |
2696 | list_for_each_entry(mod, &modules, list) { |
2697 | if (mod->num_exentries == 0) | |
2698 | continue; | |
22a8bdeb | 2699 | |
1da177e4 LT |
2700 | e = search_extable(mod->extable, |
2701 | mod->extable + mod->num_exentries - 1, | |
2702 | addr); | |
2703 | if (e) | |
2704 | break; | |
2705 | } | |
24da1cbf | 2706 | preempt_enable(); |
1da177e4 LT |
2707 | |
2708 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 2709 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
2710 | return e; |
2711 | } | |
2712 | ||
4d435f9d IM |
2713 | /* |
2714 | * Is this a valid module address? | |
2715 | */ | |
2716 | int is_module_address(unsigned long addr) | |
2717 | { | |
4d435f9d IM |
2718 | struct module *mod; |
2719 | ||
24da1cbf | 2720 | preempt_disable(); |
4d435f9d IM |
2721 | |
2722 | list_for_each_entry(mod, &modules, list) { | |
2723 | if (within(addr, mod->module_core, mod->core_size)) { | |
24da1cbf | 2724 | preempt_enable(); |
4d435f9d IM |
2725 | return 1; |
2726 | } | |
2727 | } | |
2728 | ||
24da1cbf | 2729 | preempt_enable(); |
4d435f9d IM |
2730 | |
2731 | return 0; | |
2732 | } | |
2733 | ||
2734 | ||
24da1cbf | 2735 | /* Is this a valid kernel address? */ |
1da177e4 LT |
2736 | struct module *__module_text_address(unsigned long addr) |
2737 | { | |
2738 | struct module *mod; | |
2739 | ||
3a642e99 RR |
2740 | if (addr < module_addr_min || addr > module_addr_max) |
2741 | return NULL; | |
2742 | ||
1da177e4 LT |
2743 | list_for_each_entry(mod, &modules, list) |
2744 | if (within(addr, mod->module_init, mod->init_text_size) | |
2745 | || within(addr, mod->module_core, mod->core_text_size)) | |
2746 | return mod; | |
2747 | return NULL; | |
2748 | } | |
2749 | ||
2750 | struct module *module_text_address(unsigned long addr) | |
2751 | { | |
2752 | struct module *mod; | |
1da177e4 | 2753 | |
24da1cbf | 2754 | preempt_disable(); |
1da177e4 | 2755 | mod = __module_text_address(addr); |
24da1cbf | 2756 | preempt_enable(); |
1da177e4 LT |
2757 | |
2758 | return mod; | |
2759 | } | |
2760 | ||
2761 | /* Don't grab lock, we're oopsing. */ | |
2762 | void print_modules(void) | |
2763 | { | |
2764 | struct module *mod; | |
2bc2d61a | 2765 | char buf[8]; |
1da177e4 LT |
2766 | |
2767 | printk("Modules linked in:"); | |
2768 | list_for_each_entry(mod, &modules, list) | |
21aa9280 | 2769 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
e14af7ee AV |
2770 | if (last_unloaded_module[0]) |
2771 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
2772 | printk("\n"); |
2773 | } | |
2774 | ||
1da177e4 LT |
2775 | #ifdef CONFIG_MODVERSIONS |
2776 | /* Generate the signature for struct module here, too, for modversions. */ | |
2777 | void struct_module(struct module *mod) { return; } | |
2778 | EXPORT_SYMBOL(struct_module); | |
2779 | #endif | |
8256e47c MD |
2780 | |
2781 | #ifdef CONFIG_MARKERS | |
fb40bd78 | 2782 | void module_update_markers(void) |
8256e47c MD |
2783 | { |
2784 | struct module *mod; | |
2785 | ||
2786 | mutex_lock(&module_mutex); | |
2787 | list_for_each_entry(mod, &modules, list) | |
2788 | if (!mod->taints) | |
2789 | marker_update_probe_range(mod->markers, | |
fb40bd78 | 2790 | mod->markers + mod->num_markers); |
8256e47c MD |
2791 | mutex_unlock(&module_mutex); |
2792 | } | |
2793 | #endif | |
97e1c18e MD |
2794 | |
2795 | #ifdef CONFIG_TRACEPOINTS | |
2796 | void module_update_tracepoints(void) | |
2797 | { | |
2798 | struct module *mod; | |
2799 | ||
2800 | mutex_lock(&module_mutex); | |
2801 | list_for_each_entry(mod, &modules, list) | |
2802 | if (!mod->taints) | |
2803 | tracepoint_update_probe_range(mod->tracepoints, | |
2804 | mod->tracepoints + mod->num_tracepoints); | |
2805 | mutex_unlock(&module_mutex); | |
2806 | } | |
2807 | ||
2808 | /* | |
2809 | * Returns 0 if current not found. | |
2810 | * Returns 1 if current found. | |
2811 | */ | |
2812 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) | |
2813 | { | |
2814 | struct module *iter_mod; | |
2815 | int found = 0; | |
2816 | ||
2817 | mutex_lock(&module_mutex); | |
2818 | list_for_each_entry(iter_mod, &modules, list) { | |
2819 | if (!iter_mod->taints) { | |
2820 | /* | |
2821 | * Sorted module list | |
2822 | */ | |
2823 | if (iter_mod < iter->module) | |
2824 | continue; | |
2825 | else if (iter_mod > iter->module) | |
2826 | iter->tracepoint = NULL; | |
2827 | found = tracepoint_get_iter_range(&iter->tracepoint, | |
2828 | iter_mod->tracepoints, | |
2829 | iter_mod->tracepoints | |
2830 | + iter_mod->num_tracepoints); | |
2831 | if (found) { | |
2832 | iter->module = iter_mod; | |
2833 | break; | |
2834 | } | |
2835 | } | |
2836 | } | |
2837 | mutex_unlock(&module_mutex); | |
2838 | return found; | |
2839 | } | |
2840 | #endif |