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