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