Commit | Line | Data |
---|---|---|
f71d20e9 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 LT |
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 | */ | |
9984de1a | 19 | #include <linux/export.h> |
1da177e4 | 20 | #include <linux/moduleloader.h> |
af658dca | 21 | #include <linux/trace_events.h> |
1da177e4 | 22 | #include <linux/init.h> |
ae84e324 | 23 | #include <linux/kallsyms.h> |
34e1169d | 24 | #include <linux/file.h> |
3b5d5c6b | 25 | #include <linux/fs.h> |
6d760133 | 26 | #include <linux/sysfs.h> |
9f158333 | 27 | #include <linux/kernel.h> |
1da177e4 LT |
28 | #include <linux/slab.h> |
29 | #include <linux/vmalloc.h> | |
30 | #include <linux/elf.h> | |
3b5d5c6b | 31 | #include <linux/proc_fs.h> |
2e72d51b | 32 | #include <linux/security.h> |
1da177e4 LT |
33 | #include <linux/seq_file.h> |
34 | #include <linux/syscalls.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/rcupdate.h> | |
c59ede7b | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/cpu.h> |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/err.h> | |
42 | #include <linux/vermagic.h> | |
43 | #include <linux/notifier.h> | |
f6a57033 | 44 | #include <linux/sched.h> |
1da177e4 | 45 | #include <linux/device.h> |
c988d2b2 | 46 | #include <linux/string.h> |
97d1f15b | 47 | #include <linux/mutex.h> |
d72b3751 | 48 | #include <linux/rculist.h> |
1da177e4 | 49 | #include <asm/uaccess.h> |
1da177e4 | 50 | #include <asm/cacheflush.h> |
eb8cdec4 | 51 | #include <asm/mmu_context.h> |
b817f6fe | 52 | #include <linux/license.h> |
6d762394 | 53 | #include <asm/sections.h> |
97e1c18e | 54 | #include <linux/tracepoint.h> |
90d595fe | 55 | #include <linux/ftrace.h> |
22a9d645 | 56 | #include <linux/async.h> |
fbf59bc9 | 57 | #include <linux/percpu.h> |
4f2294b6 | 58 | #include <linux/kmemleak.h> |
bf5438fc | 59 | #include <linux/jump_label.h> |
84e1c6bb | 60 | #include <linux/pfn.h> |
403ed278 | 61 | #include <linux/bsearch.h> |
2f3238ae | 62 | #include <uapi/linux/module.h> |
106a4ee2 | 63 | #include "module-internal.h" |
1da177e4 | 64 | |
7ead8b83 LZ |
65 | #define CREATE_TRACE_POINTS |
66 | #include <trace/events/module.h> | |
67 | ||
1da177e4 LT |
68 | #ifndef ARCH_SHF_SMALL |
69 | #define ARCH_SHF_SMALL 0 | |
70 | #endif | |
71 | ||
84e1c6bb | 72 | /* |
73 | * Modules' sections will be aligned on page boundaries | |
74 | * to ensure complete separation of code and data, but | |
75 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y | |
76 | */ | |
77 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
78 | # define debug_align(X) ALIGN(X, PAGE_SIZE) | |
79 | #else | |
80 | # define debug_align(X) (X) | |
81 | #endif | |
82 | ||
1da177e4 LT |
83 | /* If this is set, the section belongs in the init part of the module */ |
84 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
85 | ||
75676500 RR |
86 | /* |
87 | * Mutex protects: | |
88 | * 1) List of modules (also safely readable with preempt_disable), | |
89 | * 2) module_use links, | |
90 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 91 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
92 | DEFINE_MUTEX(module_mutex); |
93 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 94 | static LIST_HEAD(modules); |
67fc4e0c | 95 | |
6c9692e2 | 96 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 97 | |
93c2e105 PZ |
98 | /* |
99 | * Use a latched RB-tree for __module_address(); this allows us to use | |
100 | * RCU-sched lookups of the address from any context. | |
101 | * | |
6c9692e2 PZ |
102 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
103 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
104 | * NMI context. | |
93c2e105 PZ |
105 | */ |
106 | ||
107 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 108 | { |
7523e4dc | 109 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 110 | |
7523e4dc | 111 | return (unsigned long)layout->base; |
93c2e105 PZ |
112 | } |
113 | ||
114 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
115 | { | |
7523e4dc | 116 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 117 | |
7523e4dc | 118 | return (unsigned long)layout->size; |
93c2e105 PZ |
119 | } |
120 | ||
121 | static __always_inline bool | |
122 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
123 | { | |
124 | return __mod_tree_val(a) < __mod_tree_val(b); | |
125 | } | |
126 | ||
127 | static __always_inline int | |
128 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
129 | { | |
130 | unsigned long val = (unsigned long)key; | |
131 | unsigned long start, end; | |
132 | ||
133 | start = __mod_tree_val(n); | |
134 | if (val < start) | |
135 | return -1; | |
136 | ||
137 | end = start + __mod_tree_size(n); | |
138 | if (val >= end) | |
139 | return 1; | |
106a4ee2 | 140 | |
106a4ee2 RR |
141 | return 0; |
142 | } | |
143 | ||
93c2e105 PZ |
144 | static const struct latch_tree_ops mod_tree_ops = { |
145 | .less = mod_tree_less, | |
146 | .comp = mod_tree_comp, | |
147 | }; | |
148 | ||
4f666546 PZ |
149 | static struct mod_tree_root { |
150 | struct latch_tree_root root; | |
151 | unsigned long addr_min; | |
152 | unsigned long addr_max; | |
153 | } mod_tree __cacheline_aligned = { | |
154 | .addr_min = -1UL, | |
106a4ee2 | 155 | }; |
106a4ee2 | 156 | |
4f666546 PZ |
157 | #define module_addr_min mod_tree.addr_min |
158 | #define module_addr_max mod_tree.addr_max | |
159 | ||
160 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
161 | { | |
162 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
163 | } | |
164 | ||
165 | static void __mod_tree_remove(struct mod_tree_node *node) | |
166 | { | |
167 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
168 | } | |
93c2e105 PZ |
169 | |
170 | /* | |
171 | * These modifications: insert, remove_init and remove; are serialized by the | |
172 | * module_mutex. | |
173 | */ | |
174 | static void mod_tree_insert(struct module *mod) | |
175 | { | |
7523e4dc RR |
176 | mod->core_layout.mtn.mod = mod; |
177 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 178 | |
7523e4dc RR |
179 | __mod_tree_insert(&mod->core_layout.mtn); |
180 | if (mod->init_layout.size) | |
181 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
182 | } |
183 | ||
184 | static void mod_tree_remove_init(struct module *mod) | |
185 | { | |
7523e4dc RR |
186 | if (mod->init_layout.size) |
187 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
188 | } |
189 | ||
190 | static void mod_tree_remove(struct module *mod) | |
191 | { | |
7523e4dc | 192 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
193 | mod_tree_remove_init(mod); |
194 | } | |
195 | ||
6c9692e2 | 196 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
197 | { |
198 | struct latch_tree_node *ltn; | |
199 | ||
4f666546 | 200 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
201 | if (!ltn) |
202 | return NULL; | |
203 | ||
204 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
205 | } | |
206 | ||
6c9692e2 PZ |
207 | #else /* MODULES_TREE_LOOKUP */ |
208 | ||
4f666546 PZ |
209 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
210 | ||
6c9692e2 PZ |
211 | static void mod_tree_insert(struct module *mod) { } |
212 | static void mod_tree_remove_init(struct module *mod) { } | |
213 | static void mod_tree_remove(struct module *mod) { } | |
214 | ||
215 | static struct module *mod_find(unsigned long addr) | |
216 | { | |
217 | struct module *mod; | |
218 | ||
219 | list_for_each_entry_rcu(mod, &modules, list) { | |
220 | if (within_module(addr, mod)) | |
221 | return mod; | |
222 | } | |
223 | ||
224 | return NULL; | |
225 | } | |
226 | ||
227 | #endif /* MODULES_TREE_LOOKUP */ | |
228 | ||
4f666546 PZ |
229 | /* |
230 | * Bounds of module text, for speeding up __module_address. | |
231 | * Protected by module_mutex. | |
232 | */ | |
233 | static void __mod_update_bounds(void *base, unsigned int size) | |
234 | { | |
235 | unsigned long min = (unsigned long)base; | |
236 | unsigned long max = min + size; | |
237 | ||
238 | if (min < module_addr_min) | |
239 | module_addr_min = min; | |
240 | if (max > module_addr_max) | |
241 | module_addr_max = max; | |
242 | } | |
243 | ||
244 | static void mod_update_bounds(struct module *mod) | |
245 | { | |
7523e4dc RR |
246 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
247 | if (mod->init_layout.size) | |
248 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
249 | } |
250 | ||
67fc4e0c JW |
251 | #ifdef CONFIG_KGDB_KDB |
252 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
253 | #endif /* CONFIG_KGDB_KDB */ | |
254 | ||
0be964be PZ |
255 | static void module_assert_mutex(void) |
256 | { | |
257 | lockdep_assert_held(&module_mutex); | |
258 | } | |
259 | ||
260 | static void module_assert_mutex_or_preempt(void) | |
261 | { | |
262 | #ifdef CONFIG_LOCKDEP | |
263 | if (unlikely(!debug_locks)) | |
264 | return; | |
265 | ||
266 | WARN_ON(!rcu_read_lock_sched_held() && | |
267 | !lockdep_is_held(&module_mutex)); | |
268 | #endif | |
269 | } | |
270 | ||
6727bb9c LR |
271 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
272 | #ifndef CONFIG_MODULE_SIG_FORCE | |
106a4ee2 RR |
273 | module_param(sig_enforce, bool_enable_only, 0644); |
274 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
1da177e4 | 275 | |
19e4529e SR |
276 | /* Block module loading/unloading? */ |
277 | int modules_disabled = 0; | |
02608bef | 278 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 279 | |
c9a3ba55 RR |
280 | /* Waiting for a module to finish initializing? */ |
281 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
282 | ||
e041c683 | 283 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 284 | |
6da0b565 | 285 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 286 | { |
e041c683 | 287 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
288 | } |
289 | EXPORT_SYMBOL(register_module_notifier); | |
290 | ||
6da0b565 | 291 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 292 | { |
e041c683 | 293 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
294 | } |
295 | EXPORT_SYMBOL(unregister_module_notifier); | |
296 | ||
eded41c1 RR |
297 | struct load_info { |
298 | Elf_Ehdr *hdr; | |
299 | unsigned long len; | |
300 | Elf_Shdr *sechdrs; | |
6526c534 | 301 | char *secstrings, *strtab; |
d913188c | 302 | unsigned long symoffs, stroffs; |
811d66a0 RR |
303 | struct _ddebug *debug; |
304 | unsigned int num_debug; | |
106a4ee2 | 305 | bool sig_ok; |
8244062e RR |
306 | #ifdef CONFIG_KALLSYMS |
307 | unsigned long mod_kallsyms_init_off; | |
308 | #endif | |
eded41c1 RR |
309 | struct { |
310 | unsigned int sym, str, mod, vers, info, pcpu; | |
311 | } index; | |
312 | }; | |
313 | ||
9a4b9708 ML |
314 | /* We require a truly strong try_module_get(): 0 means failure due to |
315 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
316 | static inline int strong_try_module_get(struct module *mod) |
317 | { | |
0d21b0e3 | 318 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 319 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
320 | return -EBUSY; |
321 | if (try_module_get(mod)) | |
1da177e4 | 322 | return 0; |
c9a3ba55 RR |
323 | else |
324 | return -ENOENT; | |
1da177e4 LT |
325 | } |
326 | ||
373d4d09 RR |
327 | static inline void add_taint_module(struct module *mod, unsigned flag, |
328 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 329 | { |
373d4d09 | 330 | add_taint(flag, lockdep_ok); |
25ddbb18 | 331 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
332 | } |
333 | ||
02a3e59a RD |
334 | /* |
335 | * A thread that wants to hold a reference to a module only while it | |
336 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
337 | */ |
338 | void __module_put_and_exit(struct module *mod, long code) | |
339 | { | |
340 | module_put(mod); | |
341 | do_exit(code); | |
342 | } | |
343 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 344 | |
1da177e4 | 345 | /* Find a module section: 0 means not found. */ |
49668688 | 346 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
347 | { |
348 | unsigned int i; | |
349 | ||
49668688 RR |
350 | for (i = 1; i < info->hdr->e_shnum; i++) { |
351 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 352 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
353 | if ((shdr->sh_flags & SHF_ALLOC) |
354 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 355 | return i; |
49668688 | 356 | } |
1da177e4 LT |
357 | return 0; |
358 | } | |
359 | ||
5e458cc0 | 360 | /* Find a module section, or NULL. */ |
49668688 | 361 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
362 | { |
363 | /* Section 0 has sh_addr 0. */ | |
49668688 | 364 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
365 | } |
366 | ||
367 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 368 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
369 | const char *name, |
370 | size_t object_size, | |
371 | unsigned int *num) | |
372 | { | |
49668688 | 373 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
374 | |
375 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
376 | *num = info->sechdrs[sec].sh_size / object_size; |
377 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
378 | } |
379 | ||
1da177e4 LT |
380 | /* Provided by the linker */ |
381 | extern const struct kernel_symbol __start___ksymtab[]; | |
382 | extern const struct kernel_symbol __stop___ksymtab[]; | |
383 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
384 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
385 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
386 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
387 | extern const unsigned long __start___kcrctab[]; |
388 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 389 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
390 | #ifdef CONFIG_UNUSED_SYMBOLS |
391 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
392 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
393 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
394 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
395 | extern const unsigned long __start___kcrctab_unused[]; |
396 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 397 | #endif |
1da177e4 LT |
398 | |
399 | #ifndef CONFIG_MODVERSIONS | |
400 | #define symversion(base, idx) NULL | |
401 | #else | |
f83ca9fe | 402 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
403 | #endif |
404 | ||
dafd0940 RR |
405 | static bool each_symbol_in_section(const struct symsearch *arr, |
406 | unsigned int arrsize, | |
407 | struct module *owner, | |
408 | bool (*fn)(const struct symsearch *syms, | |
409 | struct module *owner, | |
de4d8d53 | 410 | void *data), |
dafd0940 | 411 | void *data) |
ad9546c9 | 412 | { |
de4d8d53 | 413 | unsigned int j; |
ad9546c9 | 414 | |
dafd0940 | 415 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
416 | if (fn(&arr[j], owner, data)) |
417 | return true; | |
f71d20e9 | 418 | } |
dafd0940 RR |
419 | |
420 | return false; | |
ad9546c9 RR |
421 | } |
422 | ||
dafd0940 | 423 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
424 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
425 | struct module *owner, | |
426 | void *data), | |
427 | void *data) | |
ad9546c9 RR |
428 | { |
429 | struct module *mod; | |
44032e63 | 430 | static const struct symsearch arr[] = { |
ad9546c9 | 431 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 432 | NOT_GPL_ONLY, false }, |
ad9546c9 | 433 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
434 | __start___kcrctab_gpl, |
435 | GPL_ONLY, false }, | |
ad9546c9 | 436 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
437 | __start___kcrctab_gpl_future, |
438 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 439 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 440 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
441 | __start___kcrctab_unused, |
442 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 443 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
444 | __start___kcrctab_unused_gpl, |
445 | GPL_ONLY, true }, | |
f7f5b675 | 446 | #endif |
ad9546c9 | 447 | }; |
f71d20e9 | 448 | |
0be964be PZ |
449 | module_assert_mutex_or_preempt(); |
450 | ||
dafd0940 RR |
451 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
452 | return true; | |
f71d20e9 | 453 | |
d72b3751 | 454 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
455 | struct symsearch arr[] = { |
456 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 457 | NOT_GPL_ONLY, false }, |
ad9546c9 | 458 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
459 | mod->gpl_crcs, |
460 | GPL_ONLY, false }, | |
ad9546c9 RR |
461 | { mod->gpl_future_syms, |
462 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
463 | mod->gpl_future_crcs, |
464 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 465 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
466 | { mod->unused_syms, |
467 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
468 | mod->unused_crcs, |
469 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
470 | { mod->unused_gpl_syms, |
471 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
472 | mod->unused_gpl_crcs, |
473 | GPL_ONLY, true }, | |
f7f5b675 | 474 | #endif |
ad9546c9 RR |
475 | }; |
476 | ||
0d21b0e3 RR |
477 | if (mod->state == MODULE_STATE_UNFORMED) |
478 | continue; | |
479 | ||
dafd0940 RR |
480 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
481 | return true; | |
482 | } | |
483 | return false; | |
484 | } | |
de4d8d53 | 485 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
486 | |
487 | struct find_symbol_arg { | |
488 | /* Input */ | |
489 | const char *name; | |
490 | bool gplok; | |
491 | bool warn; | |
492 | ||
493 | /* Output */ | |
494 | struct module *owner; | |
495 | const unsigned long *crc; | |
414fd31b | 496 | const struct kernel_symbol *sym; |
dafd0940 RR |
497 | }; |
498 | ||
de4d8d53 RR |
499 | static bool check_symbol(const struct symsearch *syms, |
500 | struct module *owner, | |
501 | unsigned int symnum, void *data) | |
dafd0940 RR |
502 | { |
503 | struct find_symbol_arg *fsa = data; | |
504 | ||
dafd0940 RR |
505 | if (!fsa->gplok) { |
506 | if (syms->licence == GPL_ONLY) | |
507 | return false; | |
508 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
509 | pr_warn("Symbol %s is being used by a non-GPL module, " |
510 | "which will not be allowed in the future\n", | |
511 | fsa->name); | |
9f28bb7e | 512 | } |
1da177e4 | 513 | } |
ad9546c9 | 514 | |
f7f5b675 | 515 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 516 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
517 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
518 | "using it.\n", fsa->name); | |
519 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
520 | pr_warn("Please evaluate if this is the right api to use and " |
521 | "if it really is, submit a report to the linux kernel " | |
522 | "mailing list together with submitting your code for " | |
bddb12b3 | 523 | "inclusion.\n"); |
dafd0940 | 524 | } |
f7f5b675 | 525 | #endif |
dafd0940 RR |
526 | |
527 | fsa->owner = owner; | |
528 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 529 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
530 | return true; |
531 | } | |
532 | ||
403ed278 AIB |
533 | static int cmp_name(const void *va, const void *vb) |
534 | { | |
535 | const char *a; | |
536 | const struct kernel_symbol *b; | |
537 | a = va; b = vb; | |
538 | return strcmp(a, b->name); | |
539 | } | |
540 | ||
de4d8d53 RR |
541 | static bool find_symbol_in_section(const struct symsearch *syms, |
542 | struct module *owner, | |
543 | void *data) | |
544 | { | |
545 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
546 | struct kernel_symbol *sym; |
547 | ||
548 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
549 | sizeof(struct kernel_symbol), cmp_name); | |
550 | ||
551 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
552 | return true; | |
de4d8d53 | 553 | |
de4d8d53 RR |
554 | return false; |
555 | } | |
556 | ||
414fd31b | 557 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 558 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
559 | const struct kernel_symbol *find_symbol(const char *name, |
560 | struct module **owner, | |
561 | const unsigned long **crc, | |
562 | bool gplok, | |
563 | bool warn) | |
dafd0940 RR |
564 | { |
565 | struct find_symbol_arg fsa; | |
566 | ||
567 | fsa.name = name; | |
568 | fsa.gplok = gplok; | |
569 | fsa.warn = warn; | |
570 | ||
de4d8d53 | 571 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
572 | if (owner) |
573 | *owner = fsa.owner; | |
574 | if (crc) | |
575 | *crc = fsa.crc; | |
414fd31b | 576 | return fsa.sym; |
dafd0940 RR |
577 | } |
578 | ||
5e124169 | 579 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 580 | return NULL; |
1da177e4 | 581 | } |
c6b37801 | 582 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 583 | |
fe0d34d2 RR |
584 | /* |
585 | * Search for module by name: must hold module_mutex (or preempt disabled | |
586 | * for read-only access). | |
587 | */ | |
4f6de4d5 | 588 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 589 | bool even_unformed) |
1da177e4 LT |
590 | { |
591 | struct module *mod; | |
592 | ||
fe0d34d2 | 593 | module_assert_mutex_or_preempt(); |
0be964be | 594 | |
1da177e4 | 595 | list_for_each_entry(mod, &modules, list) { |
0d21b0e3 RR |
596 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
597 | continue; | |
4f6de4d5 | 598 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
599 | return mod; |
600 | } | |
601 | return NULL; | |
602 | } | |
0d21b0e3 RR |
603 | |
604 | struct module *find_module(const char *name) | |
605 | { | |
fe0d34d2 | 606 | module_assert_mutex(); |
4f6de4d5 | 607 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 608 | } |
c6b37801 | 609 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
610 | |
611 | #ifdef CONFIG_SMP | |
fbf59bc9 | 612 | |
259354de | 613 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 614 | { |
259354de TH |
615 | return mod->percpu; |
616 | } | |
fbf59bc9 | 617 | |
9eb76d77 | 618 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 619 | { |
9eb76d77 RR |
620 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
621 | unsigned long align = pcpusec->sh_addralign; | |
622 | ||
623 | if (!pcpusec->sh_size) | |
624 | return 0; | |
625 | ||
fbf59bc9 | 626 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
627 | pr_warn("%s: per-cpu alignment %li > %li\n", |
628 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
629 | align = PAGE_SIZE; |
630 | } | |
631 | ||
9eb76d77 | 632 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 633 | if (!mod->percpu) { |
bddb12b3 AM |
634 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
635 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
636 | return -ENOMEM; |
637 | } | |
9eb76d77 | 638 | mod->percpu_size = pcpusec->sh_size; |
259354de | 639 | return 0; |
fbf59bc9 TH |
640 | } |
641 | ||
259354de | 642 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 643 | { |
259354de | 644 | free_percpu(mod->percpu); |
fbf59bc9 TH |
645 | } |
646 | ||
49668688 | 647 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 648 | { |
49668688 | 649 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
650 | } |
651 | ||
259354de TH |
652 | static void percpu_modcopy(struct module *mod, |
653 | const void *from, unsigned long size) | |
6b588c18 TH |
654 | { |
655 | int cpu; | |
656 | ||
657 | for_each_possible_cpu(cpu) | |
259354de | 658 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
659 | } |
660 | ||
10fad5e4 TH |
661 | /** |
662 | * is_module_percpu_address - test whether address is from module static percpu | |
663 | * @addr: address to test | |
664 | * | |
665 | * Test whether @addr belongs to module static percpu area. | |
666 | * | |
667 | * RETURNS: | |
668 | * %true if @addr is from module static percpu area | |
669 | */ | |
670 | bool is_module_percpu_address(unsigned long addr) | |
671 | { | |
672 | struct module *mod; | |
673 | unsigned int cpu; | |
674 | ||
675 | preempt_disable(); | |
676 | ||
677 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
678 | if (mod->state == MODULE_STATE_UNFORMED) |
679 | continue; | |
10fad5e4 TH |
680 | if (!mod->percpu_size) |
681 | continue; | |
682 | for_each_possible_cpu(cpu) { | |
683 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
684 | ||
685 | if ((void *)addr >= start && | |
686 | (void *)addr < start + mod->percpu_size) { | |
687 | preempt_enable(); | |
688 | return true; | |
689 | } | |
690 | } | |
691 | } | |
692 | ||
693 | preempt_enable(); | |
694 | return false; | |
6b588c18 TH |
695 | } |
696 | ||
1da177e4 | 697 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 698 | |
259354de | 699 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
700 | { |
701 | return NULL; | |
702 | } | |
9eb76d77 | 703 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 704 | { |
9eb76d77 RR |
705 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
706 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
707 | return -ENOMEM; | |
708 | return 0; | |
259354de TH |
709 | } |
710 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 711 | { |
1da177e4 | 712 | } |
49668688 | 713 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
714 | { |
715 | return 0; | |
716 | } | |
259354de TH |
717 | static inline void percpu_modcopy(struct module *mod, |
718 | const void *from, unsigned long size) | |
1da177e4 LT |
719 | { |
720 | /* pcpusec should be 0, and size of that section should be 0. */ | |
721 | BUG_ON(size != 0); | |
722 | } | |
10fad5e4 TH |
723 | bool is_module_percpu_address(unsigned long addr) |
724 | { | |
725 | return false; | |
726 | } | |
6b588c18 | 727 | |
1da177e4 LT |
728 | #endif /* CONFIG_SMP */ |
729 | ||
c988d2b2 MD |
730 | #define MODINFO_ATTR(field) \ |
731 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
732 | { \ | |
733 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
734 | } \ | |
735 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 736 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 737 | { \ |
cc56ded3 | 738 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
739 | } \ |
740 | static int modinfo_##field##_exists(struct module *mod) \ | |
741 | { \ | |
742 | return mod->field != NULL; \ | |
743 | } \ | |
744 | static void free_modinfo_##field(struct module *mod) \ | |
745 | { \ | |
22a8bdeb DW |
746 | kfree(mod->field); \ |
747 | mod->field = NULL; \ | |
c988d2b2 MD |
748 | } \ |
749 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 750 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
751 | .show = show_modinfo_##field, \ |
752 | .setup = setup_modinfo_##field, \ | |
753 | .test = modinfo_##field##_exists, \ | |
754 | .free = free_modinfo_##field, \ | |
755 | }; | |
756 | ||
757 | MODINFO_ATTR(version); | |
758 | MODINFO_ATTR(srcversion); | |
759 | ||
e14af7ee AV |
760 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
761 | ||
03e88ae1 | 762 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
763 | |
764 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
765 | ||
e513cc1c MH |
766 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
767 | #define MODULE_REF_BASE 1 | |
768 | ||
1da177e4 | 769 | /* Init the unload section of the module. */ |
9f85a4bb | 770 | static int module_unload_init(struct module *mod) |
1da177e4 | 771 | { |
e513cc1c MH |
772 | /* |
773 | * Initialize reference counter to MODULE_REF_BASE. | |
774 | * refcnt == 0 means module is going. | |
775 | */ | |
776 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 777 | |
2c02dfe7 LT |
778 | INIT_LIST_HEAD(&mod->source_list); |
779 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 780 | |
1da177e4 | 781 | /* Hold reference count during initialization. */ |
e513cc1c | 782 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
783 | |
784 | return 0; | |
1da177e4 LT |
785 | } |
786 | ||
1da177e4 LT |
787 | /* Does a already use b? */ |
788 | static int already_uses(struct module *a, struct module *b) | |
789 | { | |
790 | struct module_use *use; | |
791 | ||
2c02dfe7 LT |
792 | list_for_each_entry(use, &b->source_list, source_list) { |
793 | if (use->source == a) { | |
5e124169 | 794 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
795 | return 1; |
796 | } | |
797 | } | |
5e124169 | 798 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
799 | return 0; |
800 | } | |
801 | ||
2c02dfe7 LT |
802 | /* |
803 | * Module a uses b | |
804 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
805 | * - the module_use is added to the list of 'b' sources (so | |
806 | * 'b' can walk the list to see who sourced them), and of 'a' | |
807 | * targets (so 'a' can see what modules it targets). | |
808 | */ | |
809 | static int add_module_usage(struct module *a, struct module *b) | |
810 | { | |
2c02dfe7 LT |
811 | struct module_use *use; |
812 | ||
5e124169 | 813 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
814 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
815 | if (!use) { | |
bddb12b3 | 816 | pr_warn("%s: out of memory loading\n", a->name); |
2c02dfe7 LT |
817 | return -ENOMEM; |
818 | } | |
819 | ||
820 | use->source = a; | |
821 | use->target = b; | |
822 | list_add(&use->source_list, &b->source_list); | |
823 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
824 | return 0; |
825 | } | |
826 | ||
75676500 | 827 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 828 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 829 | { |
c8e21ced | 830 | int err; |
270a6c4c | 831 | |
9bea7f23 | 832 | if (b == NULL || already_uses(a, b)) |
218ce735 | 833 | return 0; |
218ce735 | 834 | |
9bea7f23 RR |
835 | /* If module isn't available, we fail. */ |
836 | err = strong_try_module_get(b); | |
c9a3ba55 | 837 | if (err) |
9bea7f23 | 838 | return err; |
1da177e4 | 839 | |
2c02dfe7 LT |
840 | err = add_module_usage(a, b); |
841 | if (err) { | |
1da177e4 | 842 | module_put(b); |
9bea7f23 | 843 | return err; |
1da177e4 | 844 | } |
9bea7f23 | 845 | return 0; |
1da177e4 | 846 | } |
9bea7f23 | 847 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
848 | |
849 | /* Clear the unload stuff of the module. */ | |
850 | static void module_unload_free(struct module *mod) | |
851 | { | |
2c02dfe7 | 852 | struct module_use *use, *tmp; |
1da177e4 | 853 | |
75676500 | 854 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
855 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
856 | struct module *i = use->target; | |
5e124169 | 857 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
858 | module_put(i); |
859 | list_del(&use->source_list); | |
860 | list_del(&use->target_list); | |
861 | kfree(use); | |
1da177e4 | 862 | } |
75676500 | 863 | mutex_unlock(&module_mutex); |
1da177e4 LT |
864 | } |
865 | ||
866 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 867 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
868 | { |
869 | int ret = (flags & O_TRUNC); | |
870 | if (ret) | |
373d4d09 | 871 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
872 | return ret; |
873 | } | |
874 | #else | |
fb169793 | 875 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
876 | { |
877 | return 0; | |
878 | } | |
879 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
880 | ||
e513cc1c MH |
881 | /* Try to release refcount of module, 0 means success. */ |
882 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 883 | { |
e513cc1c | 884 | int ret; |
1da177e4 | 885 | |
e513cc1c MH |
886 | /* Try to decrement refcnt which we set at loading */ |
887 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
888 | BUG_ON(ret < 0); | |
889 | if (ret) | |
890 | /* Someone can put this right now, recover with checking */ | |
891 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 892 | |
e513cc1c MH |
893 | return ret; |
894 | } | |
1da177e4 | 895 | |
e513cc1c MH |
896 | static int try_stop_module(struct module *mod, int flags, int *forced) |
897 | { | |
da39ba5e | 898 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
899 | if (try_release_module_ref(mod) != 0) { |
900 | *forced = try_force_unload(flags); | |
901 | if (!(*forced)) | |
1da177e4 LT |
902 | return -EWOULDBLOCK; |
903 | } | |
904 | ||
905 | /* Mark it as dying. */ | |
e513cc1c | 906 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 907 | |
e513cc1c | 908 | return 0; |
1da177e4 LT |
909 | } |
910 | ||
d5db139a RR |
911 | /** |
912 | * module_refcount - return the refcount or -1 if unloading | |
913 | * | |
914 | * @mod: the module we're checking | |
915 | * | |
916 | * Returns: | |
917 | * -1 if the module is in the process of unloading | |
918 | * otherwise the number of references in the kernel to the module | |
919 | */ | |
920 | int module_refcount(struct module *mod) | |
1da177e4 | 921 | { |
d5db139a | 922 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
923 | } |
924 | EXPORT_SYMBOL(module_refcount); | |
925 | ||
926 | /* This exists whether we can unload or not */ | |
927 | static void free_module(struct module *mod); | |
928 | ||
17da2bd9 HC |
929 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
930 | unsigned int, flags) | |
1da177e4 LT |
931 | { |
932 | struct module *mod; | |
dfff0a06 | 933 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
934 | int ret, forced = 0; |
935 | ||
3d43321b | 936 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
937 | return -EPERM; |
938 | ||
939 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
940 | return -EFAULT; | |
941 | name[MODULE_NAME_LEN-1] = '\0'; | |
942 | ||
3fc1f1e2 TH |
943 | if (mutex_lock_interruptible(&module_mutex) != 0) |
944 | return -EINTR; | |
1da177e4 LT |
945 | |
946 | mod = find_module(name); | |
947 | if (!mod) { | |
948 | ret = -ENOENT; | |
949 | goto out; | |
950 | } | |
951 | ||
2c02dfe7 | 952 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
953 | /* Other modules depend on us: get rid of them first. */ |
954 | ret = -EWOULDBLOCK; | |
955 | goto out; | |
956 | } | |
957 | ||
958 | /* Doing init or already dying? */ | |
959 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 960 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 961 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
962 | ret = -EBUSY; |
963 | goto out; | |
964 | } | |
965 | ||
966 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 967 | if (mod->init && !mod->exit) { |
fb169793 | 968 | forced = try_force_unload(flags); |
1da177e4 LT |
969 | if (!forced) { |
970 | /* This module can't be removed */ | |
971 | ret = -EBUSY; | |
972 | goto out; | |
973 | } | |
974 | } | |
975 | ||
1da177e4 LT |
976 | /* Stop the machine so refcounts can't move and disable module. */ |
977 | ret = try_stop_module(mod, flags, &forced); | |
978 | if (ret != 0) | |
979 | goto out; | |
980 | ||
df4b565e | 981 | mutex_unlock(&module_mutex); |
25985edc | 982 | /* Final destruction now no one is using it. */ |
df4b565e | 983 | if (mod->exit != NULL) |
1da177e4 | 984 | mod->exit(); |
df4b565e PO |
985 | blocking_notifier_call_chain(&module_notify_list, |
986 | MODULE_STATE_GOING, mod); | |
7dcd182b JY |
987 | ftrace_release_mod(mod); |
988 | ||
22a9d645 | 989 | async_synchronize_full(); |
75676500 | 990 | |
e14af7ee | 991 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 992 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 993 | |
75676500 RR |
994 | free_module(mod); |
995 | return 0; | |
996 | out: | |
6389a385 | 997 | mutex_unlock(&module_mutex); |
1da177e4 LT |
998 | return ret; |
999 | } | |
1000 | ||
d1e99d7a | 1001 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1002 | { |
1003 | struct module_use *use; | |
1004 | int printed_something = 0; | |
1005 | ||
d5db139a | 1006 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1007 | |
6da0b565 IA |
1008 | /* |
1009 | * Always include a trailing , so userspace can differentiate | |
1010 | * between this and the old multi-field proc format. | |
1011 | */ | |
2c02dfe7 | 1012 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1013 | printed_something = 1; |
2c02dfe7 | 1014 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1015 | } |
1016 | ||
1da177e4 LT |
1017 | if (mod->init != NULL && mod->exit == NULL) { |
1018 | printed_something = 1; | |
6da0b565 | 1019 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1020 | } |
1021 | ||
1022 | if (!printed_something) | |
6da0b565 | 1023 | seq_puts(m, "-"); |
1da177e4 LT |
1024 | } |
1025 | ||
1026 | void __symbol_put(const char *symbol) | |
1027 | { | |
1028 | struct module *owner; | |
1da177e4 | 1029 | |
24da1cbf | 1030 | preempt_disable(); |
414fd31b | 1031 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1032 | BUG(); |
1033 | module_put(owner); | |
24da1cbf | 1034 | preempt_enable(); |
1da177e4 LT |
1035 | } |
1036 | EXPORT_SYMBOL(__symbol_put); | |
1037 | ||
7d1d16e4 | 1038 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1039 | void symbol_put_addr(void *addr) |
1040 | { | |
5e376613 | 1041 | struct module *modaddr; |
7d1d16e4 | 1042 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1043 | |
7d1d16e4 | 1044 | if (core_kernel_text(a)) |
5e376613 | 1045 | return; |
1da177e4 | 1046 | |
275d7d44 PZ |
1047 | /* |
1048 | * Even though we hold a reference on the module; we still need to | |
1049 | * disable preemption in order to safely traverse the data structure. | |
1050 | */ | |
1051 | preempt_disable(); | |
7d1d16e4 | 1052 | modaddr = __module_text_address(a); |
a6e6abd5 | 1053 | BUG_ON(!modaddr); |
5e376613 | 1054 | module_put(modaddr); |
275d7d44 | 1055 | preempt_enable(); |
1da177e4 LT |
1056 | } |
1057 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1058 | ||
1059 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1060 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1061 | { |
d5db139a | 1062 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1063 | } |
1064 | ||
cca3e707 KS |
1065 | static struct module_attribute modinfo_refcnt = |
1066 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1067 | |
d53799be SR |
1068 | void __module_get(struct module *module) |
1069 | { | |
1070 | if (module) { | |
1071 | preempt_disable(); | |
2f35c41f | 1072 | atomic_inc(&module->refcnt); |
d53799be SR |
1073 | trace_module_get(module, _RET_IP_); |
1074 | preempt_enable(); | |
1075 | } | |
1076 | } | |
1077 | EXPORT_SYMBOL(__module_get); | |
1078 | ||
1079 | bool try_module_get(struct module *module) | |
1080 | { | |
1081 | bool ret = true; | |
1082 | ||
1083 | if (module) { | |
1084 | preempt_disable(); | |
e513cc1c MH |
1085 | /* Note: here, we can fail to get a reference */ |
1086 | if (likely(module_is_live(module) && | |
1087 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1088 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1089 | else |
d53799be SR |
1090 | ret = false; |
1091 | ||
1092 | preempt_enable(); | |
1093 | } | |
1094 | return ret; | |
1095 | } | |
1096 | EXPORT_SYMBOL(try_module_get); | |
1097 | ||
f6a57033 AV |
1098 | void module_put(struct module *module) |
1099 | { | |
e513cc1c MH |
1100 | int ret; |
1101 | ||
f6a57033 | 1102 | if (module) { |
e1783a24 | 1103 | preempt_disable(); |
e513cc1c MH |
1104 | ret = atomic_dec_if_positive(&module->refcnt); |
1105 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1106 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1107 | preempt_enable(); |
f6a57033 AV |
1108 | } |
1109 | } | |
1110 | EXPORT_SYMBOL(module_put); | |
1111 | ||
1da177e4 | 1112 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1113 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1114 | { |
1115 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1116 | seq_puts(m, " - -"); |
1da177e4 LT |
1117 | } |
1118 | ||
1119 | static inline void module_unload_free(struct module *mod) | |
1120 | { | |
1121 | } | |
1122 | ||
9bea7f23 | 1123 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1124 | { |
9bea7f23 | 1125 | return strong_try_module_get(b); |
1da177e4 | 1126 | } |
9bea7f23 | 1127 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1128 | |
9f85a4bb | 1129 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1130 | { |
9f85a4bb | 1131 | return 0; |
1da177e4 LT |
1132 | } |
1133 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1134 | ||
53999bf3 KW |
1135 | static size_t module_flags_taint(struct module *mod, char *buf) |
1136 | { | |
1137 | size_t l = 0; | |
1138 | ||
1139 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) | |
1140 | buf[l++] = 'P'; | |
1141 | if (mod->taints & (1 << TAINT_OOT_MODULE)) | |
1142 | buf[l++] = 'O'; | |
1143 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) | |
1144 | buf[l++] = 'F'; | |
1145 | if (mod->taints & (1 << TAINT_CRAP)) | |
1146 | buf[l++] = 'C'; | |
66cc69e3 | 1147 | if (mod->taints & (1 << TAINT_UNSIGNED_MODULE)) |
57673c2b | 1148 | buf[l++] = 'E'; |
53999bf3 KW |
1149 | /* |
1150 | * TAINT_FORCED_RMMOD: could be added. | |
8c90487c | 1151 | * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
53999bf3 KW |
1152 | * apply to modules. |
1153 | */ | |
1154 | return l; | |
1155 | } | |
1156 | ||
1f71740a | 1157 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1158 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1159 | { |
1160 | const char *state = "unknown"; | |
1161 | ||
4befb026 | 1162 | switch (mk->mod->state) { |
1f71740a KS |
1163 | case MODULE_STATE_LIVE: |
1164 | state = "live"; | |
1165 | break; | |
1166 | case MODULE_STATE_COMING: | |
1167 | state = "coming"; | |
1168 | break; | |
1169 | case MODULE_STATE_GOING: | |
1170 | state = "going"; | |
1171 | break; | |
0d21b0e3 RR |
1172 | default: |
1173 | BUG(); | |
1f71740a KS |
1174 | } |
1175 | return sprintf(buffer, "%s\n", state); | |
1176 | } | |
1177 | ||
cca3e707 KS |
1178 | static struct module_attribute modinfo_initstate = |
1179 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1180 | |
88bfa324 KS |
1181 | static ssize_t store_uevent(struct module_attribute *mattr, |
1182 | struct module_kobject *mk, | |
1183 | const char *buffer, size_t count) | |
1184 | { | |
1185 | enum kobject_action action; | |
1186 | ||
1187 | if (kobject_action_type(buffer, count, &action) == 0) | |
1188 | kobject_uevent(&mk->kobj, action); | |
1189 | return count; | |
1190 | } | |
1191 | ||
cca3e707 KS |
1192 | struct module_attribute module_uevent = |
1193 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1194 | ||
1195 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1196 | struct module_kobject *mk, char *buffer) | |
1197 | { | |
7523e4dc | 1198 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1199 | } |
1200 | ||
1201 | static struct module_attribute modinfo_coresize = | |
1202 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1203 | ||
1204 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1205 | struct module_kobject *mk, char *buffer) | |
1206 | { | |
7523e4dc | 1207 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1208 | } |
1209 | ||
1210 | static struct module_attribute modinfo_initsize = | |
1211 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1212 | ||
1213 | static ssize_t show_taint(struct module_attribute *mattr, | |
1214 | struct module_kobject *mk, char *buffer) | |
1215 | { | |
1216 | size_t l; | |
1217 | ||
1218 | l = module_flags_taint(mk->mod, buffer); | |
1219 | buffer[l++] = '\n'; | |
1220 | return l; | |
1221 | } | |
1222 | ||
1223 | static struct module_attribute modinfo_taint = | |
1224 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1225 | |
03e88ae1 | 1226 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1227 | &module_uevent, |
03e88ae1 GKH |
1228 | &modinfo_version, |
1229 | &modinfo_srcversion, | |
cca3e707 KS |
1230 | &modinfo_initstate, |
1231 | &modinfo_coresize, | |
1232 | &modinfo_initsize, | |
1233 | &modinfo_taint, | |
03e88ae1 | 1234 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1235 | &modinfo_refcnt, |
03e88ae1 GKH |
1236 | #endif |
1237 | NULL, | |
1238 | }; | |
1239 | ||
1da177e4 LT |
1240 | static const char vermagic[] = VERMAGIC_STRING; |
1241 | ||
c6e665c8 | 1242 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1243 | { |
1244 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1245 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1246 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1247 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1248 | return 0; |
1249 | #else | |
1250 | return -ENOEXEC; | |
1251 | #endif | |
1252 | } | |
1253 | ||
1da177e4 | 1254 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
1255 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1256 | static unsigned long maybe_relocated(unsigned long crc, | |
1257 | const struct module *crc_owner) | |
1258 | { | |
1259 | #ifdef ARCH_RELOCATES_KCRCTAB | |
1260 | if (crc_owner == NULL) | |
1261 | return crc - (unsigned long)reloc_start; | |
1262 | #endif | |
1263 | return crc; | |
1264 | } | |
1265 | ||
1da177e4 LT |
1266 | static int check_version(Elf_Shdr *sechdrs, |
1267 | unsigned int versindex, | |
1268 | const char *symname, | |
6da0b565 | 1269 | struct module *mod, |
d4703aef RR |
1270 | const unsigned long *crc, |
1271 | const struct module *crc_owner) | |
1da177e4 LT |
1272 | { |
1273 | unsigned int i, num_versions; | |
1274 | struct modversion_info *versions; | |
1275 | ||
1276 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1277 | if (!crc) | |
1278 | return 1; | |
1279 | ||
a5dd6970 RR |
1280 | /* No versions at all? modprobe --force does this. */ |
1281 | if (versindex == 0) | |
1282 | return try_to_force_load(mod, symname) == 0; | |
1283 | ||
1da177e4 LT |
1284 | versions = (void *) sechdrs[versindex].sh_addr; |
1285 | num_versions = sechdrs[versindex].sh_size | |
1286 | / sizeof(struct modversion_info); | |
1287 | ||
1288 | for (i = 0; i < num_versions; i++) { | |
1289 | if (strcmp(versions[i].name, symname) != 0) | |
1290 | continue; | |
1291 | ||
d4703aef | 1292 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1293 | return 1; |
5e124169 | 1294 | pr_debug("Found checksum %lX vs module %lX\n", |
d4703aef | 1295 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1296 | goto bad_version; |
1da177e4 | 1297 | } |
826e4506 | 1298 | |
bddb12b3 | 1299 | pr_warn("%s: no symbol version for %s\n", mod->name, symname); |
a5dd6970 | 1300 | return 0; |
826e4506 LT |
1301 | |
1302 | bad_version: | |
6da0b565 | 1303 | pr_warn("%s: disagrees about version of symbol %s\n", |
826e4506 LT |
1304 | mod->name, symname); |
1305 | return 0; | |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1309 | unsigned int versindex, | |
1310 | struct module *mod) | |
1311 | { | |
1312 | const unsigned long *crc; | |
1da177e4 | 1313 | |
926a59b1 PZ |
1314 | /* |
1315 | * Since this should be found in kernel (which can't be removed), no | |
1316 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1317 | */ | |
1318 | preempt_disable(); | |
b92021b0 | 1319 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
926a59b1 PZ |
1320 | &crc, true, false)) { |
1321 | preempt_enable(); | |
1da177e4 | 1322 | BUG(); |
926a59b1 PZ |
1323 | } |
1324 | preempt_enable(); | |
a4b6a77b JH |
1325 | return check_version(sechdrs, versindex, |
1326 | VMLINUX_SYMBOL_STR(module_layout), mod, crc, | |
d4703aef | 1327 | NULL); |
1da177e4 LT |
1328 | } |
1329 | ||
91e37a79 RR |
1330 | /* First part is kernel version, which we ignore if module has crcs. */ |
1331 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1332 | bool has_crcs) | |
1da177e4 | 1333 | { |
91e37a79 RR |
1334 | if (has_crcs) { |
1335 | amagic += strcspn(amagic, " "); | |
1336 | bmagic += strcspn(bmagic, " "); | |
1337 | } | |
1da177e4 LT |
1338 | return strcmp(amagic, bmagic) == 0; |
1339 | } | |
1340 | #else | |
1341 | static inline int check_version(Elf_Shdr *sechdrs, | |
1342 | unsigned int versindex, | |
1343 | const char *symname, | |
6da0b565 | 1344 | struct module *mod, |
d4703aef RR |
1345 | const unsigned long *crc, |
1346 | const struct module *crc_owner) | |
1da177e4 LT |
1347 | { |
1348 | return 1; | |
1349 | } | |
1350 | ||
1351 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1352 | unsigned int versindex, | |
1353 | struct module *mod) | |
1354 | { | |
1355 | return 1; | |
1356 | } | |
1357 | ||
91e37a79 RR |
1358 | static inline int same_magic(const char *amagic, const char *bmagic, |
1359 | bool has_crcs) | |
1da177e4 LT |
1360 | { |
1361 | return strcmp(amagic, bmagic) == 0; | |
1362 | } | |
1363 | #endif /* CONFIG_MODVERSIONS */ | |
1364 | ||
75676500 | 1365 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1366 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1367 | const struct load_info *info, | |
414fd31b | 1368 | const char *name, |
9bea7f23 | 1369 | char ownername[]) |
1da177e4 LT |
1370 | { |
1371 | struct module *owner; | |
414fd31b | 1372 | const struct kernel_symbol *sym; |
1da177e4 | 1373 | const unsigned long *crc; |
9bea7f23 | 1374 | int err; |
1da177e4 | 1375 | |
d64810f5 PZ |
1376 | /* |
1377 | * The module_mutex should not be a heavily contended lock; | |
1378 | * if we get the occasional sleep here, we'll go an extra iteration | |
1379 | * in the wait_event_interruptible(), which is harmless. | |
1380 | */ | |
1381 | sched_annotate_sleep(); | |
75676500 | 1382 | mutex_lock(&module_mutex); |
414fd31b | 1383 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1384 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1385 | if (!sym) |
1386 | goto unlock; | |
1387 | ||
49668688 RR |
1388 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1389 | owner)) { | |
9bea7f23 RR |
1390 | sym = ERR_PTR(-EINVAL); |
1391 | goto getname; | |
1da177e4 | 1392 | } |
9bea7f23 RR |
1393 | |
1394 | err = ref_module(mod, owner); | |
1395 | if (err) { | |
1396 | sym = ERR_PTR(err); | |
1397 | goto getname; | |
1398 | } | |
1399 | ||
1400 | getname: | |
1401 | /* We must make copy under the lock if we failed to get ref. */ | |
1402 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1403 | unlock: | |
75676500 | 1404 | mutex_unlock(&module_mutex); |
218ce735 | 1405 | return sym; |
1da177e4 LT |
1406 | } |
1407 | ||
49668688 RR |
1408 | static const struct kernel_symbol * |
1409 | resolve_symbol_wait(struct module *mod, | |
1410 | const struct load_info *info, | |
1411 | const char *name) | |
9bea7f23 RR |
1412 | { |
1413 | const struct kernel_symbol *ksym; | |
49668688 | 1414 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1415 | |
1416 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1417 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1418 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1419 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1420 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1421 | mod->name, owner); | |
9bea7f23 RR |
1422 | } |
1423 | return ksym; | |
1424 | } | |
1425 | ||
1da177e4 LT |
1426 | /* |
1427 | * /sys/module/foo/sections stuff | |
1428 | * J. Corbet <corbet@lwn.net> | |
1429 | */ | |
8f6d0378 | 1430 | #ifdef CONFIG_SYSFS |
10b465aa | 1431 | |
8f6d0378 | 1432 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1433 | static inline bool sect_empty(const Elf_Shdr *sect) |
1434 | { | |
1435 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1436 | } | |
1437 | ||
6da0b565 | 1438 | struct module_sect_attr { |
a58730c4 RR |
1439 | struct module_attribute mattr; |
1440 | char *name; | |
1441 | unsigned long address; | |
1442 | }; | |
1443 | ||
6da0b565 | 1444 | struct module_sect_attrs { |
a58730c4 RR |
1445 | struct attribute_group grp; |
1446 | unsigned int nsections; | |
1447 | struct module_sect_attr attrs[0]; | |
1448 | }; | |
1449 | ||
1da177e4 | 1450 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1451 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1452 | { |
1453 | struct module_sect_attr *sattr = | |
1454 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1455 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1456 | } |
1457 | ||
04b1db9f IN |
1458 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1459 | { | |
a58730c4 | 1460 | unsigned int section; |
04b1db9f IN |
1461 | |
1462 | for (section = 0; section < sect_attrs->nsections; section++) | |
1463 | kfree(sect_attrs->attrs[section].name); | |
1464 | kfree(sect_attrs); | |
1465 | } | |
1466 | ||
8f6d0378 | 1467 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1468 | { |
1469 | unsigned int nloaded = 0, i, size[2]; | |
1470 | struct module_sect_attrs *sect_attrs; | |
1471 | struct module_sect_attr *sattr; | |
1472 | struct attribute **gattr; | |
22a8bdeb | 1473 | |
1da177e4 | 1474 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1475 | for (i = 0; i < info->hdr->e_shnum; i++) |
1476 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1477 | nloaded++; |
1478 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1479 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1480 | sizeof(sect_attrs->grp.attrs[0])); | |
1481 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1482 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1483 | if (sect_attrs == NULL) | |
1da177e4 LT |
1484 | return; |
1485 | ||
1486 | /* Setup section attributes. */ | |
1487 | sect_attrs->grp.name = "sections"; | |
1488 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1489 | ||
04b1db9f | 1490 | sect_attrs->nsections = 0; |
1da177e4 LT |
1491 | sattr = §_attrs->attrs[0]; |
1492 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1493 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1494 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1495 | if (sect_empty(sec)) | |
35dead42 | 1496 | continue; |
8f6d0378 RR |
1497 | sattr->address = sec->sh_addr; |
1498 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1499 | GFP_KERNEL); |
1500 | if (sattr->name == NULL) | |
1501 | goto out; | |
1502 | sect_attrs->nsections++; | |
361795b1 | 1503 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1504 | sattr->mattr.show = module_sect_show; |
1505 | sattr->mattr.store = NULL; | |
1506 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1507 | sattr->mattr.attr.mode = S_IRUGO; |
1508 | *(gattr++) = &(sattr++)->mattr.attr; | |
1509 | } | |
1510 | *gattr = NULL; | |
1511 | ||
1512 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1513 | goto out; | |
1514 | ||
1515 | mod->sect_attrs = sect_attrs; | |
1516 | return; | |
1517 | out: | |
04b1db9f | 1518 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1519 | } |
1520 | ||
1521 | static void remove_sect_attrs(struct module *mod) | |
1522 | { | |
1523 | if (mod->sect_attrs) { | |
1524 | sysfs_remove_group(&mod->mkobj.kobj, | |
1525 | &mod->sect_attrs->grp); | |
1526 | /* We are positive that no one is using any sect attrs | |
1527 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1528 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1529 | mod->sect_attrs = NULL; |
1530 | } | |
1531 | } | |
1532 | ||
6d760133 RM |
1533 | /* |
1534 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1535 | */ | |
1536 | ||
1537 | struct module_notes_attrs { | |
1538 | struct kobject *dir; | |
1539 | unsigned int notes; | |
1540 | struct bin_attribute attrs[0]; | |
1541 | }; | |
1542 | ||
2c3c8bea | 1543 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1544 | struct bin_attribute *bin_attr, |
1545 | char *buf, loff_t pos, size_t count) | |
1546 | { | |
1547 | /* | |
1548 | * The caller checked the pos and count against our size. | |
1549 | */ | |
1550 | memcpy(buf, bin_attr->private + pos, count); | |
1551 | return count; | |
1552 | } | |
1553 | ||
1554 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1555 | unsigned int i) | |
1556 | { | |
1557 | if (notes_attrs->dir) { | |
1558 | while (i-- > 0) | |
1559 | sysfs_remove_bin_file(notes_attrs->dir, | |
1560 | ¬es_attrs->attrs[i]); | |
e9432093 | 1561 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1562 | } |
1563 | kfree(notes_attrs); | |
1564 | } | |
1565 | ||
8f6d0378 | 1566 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1567 | { |
1568 | unsigned int notes, loaded, i; | |
1569 | struct module_notes_attrs *notes_attrs; | |
1570 | struct bin_attribute *nattr; | |
1571 | ||
ea6bff36 IM |
1572 | /* failed to create section attributes, so can't create notes */ |
1573 | if (!mod->sect_attrs) | |
1574 | return; | |
1575 | ||
6d760133 RM |
1576 | /* Count notes sections and allocate structures. */ |
1577 | notes = 0; | |
8f6d0378 RR |
1578 | for (i = 0; i < info->hdr->e_shnum; i++) |
1579 | if (!sect_empty(&info->sechdrs[i]) && | |
1580 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1581 | ++notes; |
1582 | ||
1583 | if (notes == 0) | |
1584 | return; | |
1585 | ||
1586 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1587 | + notes * sizeof(notes_attrs->attrs[0]), | |
1588 | GFP_KERNEL); | |
1589 | if (notes_attrs == NULL) | |
1590 | return; | |
1591 | ||
1592 | notes_attrs->notes = notes; | |
1593 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1594 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1595 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1596 | continue; |
8f6d0378 | 1597 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1598 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1599 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1600 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1601 | nattr->size = info->sechdrs[i].sh_size; |
1602 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1603 | nattr->read = module_notes_read; |
1604 | ++nattr; | |
1605 | } | |
1606 | ++loaded; | |
1607 | } | |
1608 | ||
4ff6abff | 1609 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1610 | if (!notes_attrs->dir) |
1611 | goto out; | |
1612 | ||
1613 | for (i = 0; i < notes; ++i) | |
1614 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1615 | ¬es_attrs->attrs[i])) | |
1616 | goto out; | |
1617 | ||
1618 | mod->notes_attrs = notes_attrs; | |
1619 | return; | |
1620 | ||
1621 | out: | |
1622 | free_notes_attrs(notes_attrs, i); | |
1623 | } | |
1624 | ||
1625 | static void remove_notes_attrs(struct module *mod) | |
1626 | { | |
1627 | if (mod->notes_attrs) | |
1628 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1629 | } | |
1630 | ||
1da177e4 | 1631 | #else |
04b1db9f | 1632 | |
8f6d0378 RR |
1633 | static inline void add_sect_attrs(struct module *mod, |
1634 | const struct load_info *info) | |
1da177e4 LT |
1635 | { |
1636 | } | |
1637 | ||
1638 | static inline void remove_sect_attrs(struct module *mod) | |
1639 | { | |
1640 | } | |
6d760133 | 1641 | |
8f6d0378 RR |
1642 | static inline void add_notes_attrs(struct module *mod, |
1643 | const struct load_info *info) | |
6d760133 RM |
1644 | { |
1645 | } | |
1646 | ||
1647 | static inline void remove_notes_attrs(struct module *mod) | |
1648 | { | |
1649 | } | |
8f6d0378 | 1650 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1651 | |
80a3d1bb RR |
1652 | static void add_usage_links(struct module *mod) |
1653 | { | |
1654 | #ifdef CONFIG_MODULE_UNLOAD | |
1655 | struct module_use *use; | |
1656 | int nowarn; | |
1657 | ||
75676500 | 1658 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1659 | list_for_each_entry(use, &mod->target_list, target_list) { |
1660 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1661 | &mod->mkobj.kobj, mod->name); | |
1662 | } | |
75676500 | 1663 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1664 | #endif |
1665 | } | |
1666 | ||
1667 | static void del_usage_links(struct module *mod) | |
1668 | { | |
1669 | #ifdef CONFIG_MODULE_UNLOAD | |
1670 | struct module_use *use; | |
1671 | ||
75676500 | 1672 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1673 | list_for_each_entry(use, &mod->target_list, target_list) |
1674 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1675 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1676 | #endif |
1677 | } | |
1678 | ||
6407ebb2 | 1679 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1680 | { |
1681 | struct module_attribute *attr; | |
03e88ae1 | 1682 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1683 | int error = 0; |
1684 | int i; | |
1685 | ||
03e88ae1 GKH |
1686 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1687 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1688 | GFP_KERNEL); | |
1689 | if (!mod->modinfo_attrs) | |
1690 | return -ENOMEM; | |
1691 | ||
1692 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1693 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1694 | if (!attr->test || | |
03e88ae1 GKH |
1695 | (attr->test && attr->test(mod))) { |
1696 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1697 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1698 | error = sysfs_create_file(&mod->mkobj.kobj, |
1699 | &temp_attr->attr); | |
03e88ae1 GKH |
1700 | ++temp_attr; |
1701 | } | |
c988d2b2 MD |
1702 | } |
1703 | return error; | |
1704 | } | |
1705 | ||
6407ebb2 | 1706 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1707 | { |
1708 | struct module_attribute *attr; | |
1709 | int i; | |
1710 | ||
03e88ae1 GKH |
1711 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1712 | /* pick a field to test for end of list */ | |
1713 | if (!attr->attr.name) | |
1714 | break; | |
6da0b565 | 1715 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1716 | if (attr->free) |
1717 | attr->free(mod); | |
c988d2b2 | 1718 | } |
03e88ae1 | 1719 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1720 | } |
1da177e4 | 1721 | |
942e4431 LZ |
1722 | static void mod_kobject_put(struct module *mod) |
1723 | { | |
1724 | DECLARE_COMPLETION_ONSTACK(c); | |
1725 | mod->mkobj.kobj_completion = &c; | |
1726 | kobject_put(&mod->mkobj.kobj); | |
1727 | wait_for_completion(&c); | |
1728 | } | |
1729 | ||
6407ebb2 | 1730 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1731 | { |
1732 | int err; | |
6494a93d | 1733 | struct kobject *kobj; |
1da177e4 | 1734 | |
823bccfc | 1735 | if (!module_sysfs_initialized) { |
bddb12b3 | 1736 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1737 | err = -EINVAL; |
1738 | goto out; | |
1739 | } | |
6494a93d GKH |
1740 | |
1741 | kobj = kset_find_obj(module_kset, mod->name); | |
1742 | if (kobj) { | |
bddb12b3 | 1743 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1744 | kobject_put(kobj); |
1745 | err = -EINVAL; | |
1746 | goto out; | |
1747 | } | |
1748 | ||
1da177e4 | 1749 | mod->mkobj.mod = mod; |
e17e0f51 | 1750 | |
ac3c8141 GKH |
1751 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1752 | mod->mkobj.kobj.kset = module_kset; | |
1753 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1754 | "%s", mod->name); | |
1755 | if (err) | |
942e4431 | 1756 | mod_kobject_put(mod); |
270a6c4c | 1757 | |
97c146ef | 1758 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1759 | out: |
1760 | return err; | |
1761 | } | |
1762 | ||
6407ebb2 | 1763 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1764 | const struct load_info *info, |
270a6c4c KS |
1765 | struct kernel_param *kparam, |
1766 | unsigned int num_params) | |
1767 | { | |
1768 | int err; | |
1769 | ||
80a3d1bb RR |
1770 | err = mod_sysfs_init(mod); |
1771 | if (err) | |
1772 | goto out; | |
1773 | ||
4ff6abff | 1774 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1775 | if (!mod->holders_dir) { |
1776 | err = -ENOMEM; | |
270a6c4c | 1777 | goto out_unreg; |
240936e1 | 1778 | } |
270a6c4c | 1779 | |
1da177e4 LT |
1780 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1781 | if (err) | |
270a6c4c | 1782 | goto out_unreg_holders; |
1da177e4 | 1783 | |
c988d2b2 MD |
1784 | err = module_add_modinfo_attrs(mod); |
1785 | if (err) | |
e17e0f51 | 1786 | goto out_unreg_param; |
c988d2b2 | 1787 | |
80a3d1bb | 1788 | add_usage_links(mod); |
8f6d0378 RR |
1789 | add_sect_attrs(mod, info); |
1790 | add_notes_attrs(mod, info); | |
80a3d1bb | 1791 | |
e17e0f51 | 1792 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1793 | return 0; |
1794 | ||
e17e0f51 KS |
1795 | out_unreg_param: |
1796 | module_param_sysfs_remove(mod); | |
270a6c4c | 1797 | out_unreg_holders: |
78a2d906 | 1798 | kobject_put(mod->holders_dir); |
270a6c4c | 1799 | out_unreg: |
942e4431 | 1800 | mod_kobject_put(mod); |
80a3d1bb | 1801 | out: |
1da177e4 LT |
1802 | return err; |
1803 | } | |
34e4e2fe DL |
1804 | |
1805 | static void mod_sysfs_fini(struct module *mod) | |
1806 | { | |
8f6d0378 RR |
1807 | remove_notes_attrs(mod); |
1808 | remove_sect_attrs(mod); | |
942e4431 | 1809 | mod_kobject_put(mod); |
34e4e2fe DL |
1810 | } |
1811 | ||
cf2fde7b RR |
1812 | static void init_param_lock(struct module *mod) |
1813 | { | |
1814 | mutex_init(&mod->param_lock); | |
1815 | } | |
8f6d0378 | 1816 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1817 | |
8f6d0378 RR |
1818 | static int mod_sysfs_setup(struct module *mod, |
1819 | const struct load_info *info, | |
6407ebb2 RR |
1820 | struct kernel_param *kparam, |
1821 | unsigned int num_params) | |
1822 | { | |
1823 | return 0; | |
1824 | } | |
1825 | ||
34e4e2fe DL |
1826 | static void mod_sysfs_fini(struct module *mod) |
1827 | { | |
1828 | } | |
1829 | ||
36b0360d RR |
1830 | static void module_remove_modinfo_attrs(struct module *mod) |
1831 | { | |
1832 | } | |
1833 | ||
80a3d1bb RR |
1834 | static void del_usage_links(struct module *mod) |
1835 | { | |
1836 | } | |
1837 | ||
cf2fde7b RR |
1838 | static void init_param_lock(struct module *mod) |
1839 | { | |
1840 | } | |
34e4e2fe | 1841 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1842 | |
36b0360d | 1843 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1844 | { |
80a3d1bb | 1845 | del_usage_links(mod); |
c988d2b2 | 1846 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1847 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1848 | kobject_put(mod->mkobj.drivers_dir); |
1849 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1850 | mod_sysfs_fini(mod); |
1da177e4 LT |
1851 | } |
1852 | ||
84e1c6bb | 1853 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1854 | /* | |
1855 | * LKM RO/NX protection: protect module's text/ro-data | |
1856 | * from modification and any data from execution. | |
85c898db RR |
1857 | * |
1858 | * General layout of module is: | |
1859 | * [text] [read-only-data] [writable data] | |
1860 | * text_size -----^ ^ ^ | |
1861 | * ro_size ------------------------| | | |
1862 | * size -------------------------------------------| | |
1863 | * | |
1864 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1865 | */ |
85c898db RR |
1866 | static void frob_text(const struct module_layout *layout, |
1867 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1868 | { |
85c898db RR |
1869 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1870 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1871 | set_memory((unsigned long)layout->base, | |
1872 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1873 | } |
84e1c6bb | 1874 | |
85c898db RR |
1875 | static void frob_rodata(const struct module_layout *layout, |
1876 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1877 | { |
85c898db RR |
1878 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1879 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1880 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1881 | set_memory((unsigned long)layout->base + layout->text_size, | |
1882 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb | 1883 | } |
1884 | ||
85c898db RR |
1885 | static void frob_writable_data(const struct module_layout *layout, |
1886 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1887 | { |
85c898db RR |
1888 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1889 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1890 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); | |
1891 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1892 | (layout->size - layout->ro_size) >> PAGE_SHIFT); | |
84e1c6bb | 1893 | } |
84e1c6bb | 1894 | |
85c898db RR |
1895 | /* livepatching wants to disable read-only so it can frob module. */ |
1896 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1897 | { |
85c898db RR |
1898 | frob_text(&mod->core_layout, set_memory_rw); |
1899 | frob_rodata(&mod->core_layout, set_memory_rw); | |
1900 | frob_text(&mod->init_layout, set_memory_rw); | |
1901 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1902 | } |
84e1c6bb | 1903 | |
85c898db | 1904 | void module_enable_ro(const struct module *mod) |
01526ed0 | 1905 | { |
85c898db RR |
1906 | frob_text(&mod->core_layout, set_memory_ro); |
1907 | frob_rodata(&mod->core_layout, set_memory_ro); | |
1908 | frob_text(&mod->init_layout, set_memory_ro); | |
1909 | frob_rodata(&mod->init_layout, set_memory_ro); | |
84e1c6bb | 1910 | } |
1911 | ||
85c898db | 1912 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 1913 | { |
85c898db RR |
1914 | frob_rodata(&mod->core_layout, set_memory_nx); |
1915 | frob_writable_data(&mod->core_layout, set_memory_nx); | |
1916 | frob_rodata(&mod->init_layout, set_memory_nx); | |
1917 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
1918 | } |
1919 | ||
85c898db | 1920 | static void module_disable_nx(const struct module *mod) |
01526ed0 | 1921 | { |
85c898db RR |
1922 | frob_rodata(&mod->core_layout, set_memory_x); |
1923 | frob_writable_data(&mod->core_layout, set_memory_x); | |
1924 | frob_rodata(&mod->init_layout, set_memory_x); | |
1925 | frob_writable_data(&mod->init_layout, set_memory_x); | |
84e1c6bb | 1926 | } |
1927 | ||
1928 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1929 | void set_all_modules_text_rw(void) |
84e1c6bb | 1930 | { |
1931 | struct module *mod; | |
1932 | ||
1933 | mutex_lock(&module_mutex); | |
1934 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1935 | if (mod->state == MODULE_STATE_UNFORMED) |
1936 | continue; | |
85c898db RR |
1937 | |
1938 | frob_text(&mod->core_layout, set_memory_rw); | |
1939 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb | 1940 | } |
1941 | mutex_unlock(&module_mutex); | |
1942 | } | |
1943 | ||
1944 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1945 | void set_all_modules_text_ro(void) |
84e1c6bb | 1946 | { |
1947 | struct module *mod; | |
1948 | ||
1949 | mutex_lock(&module_mutex); | |
1950 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1951 | if (mod->state == MODULE_STATE_UNFORMED) |
1952 | continue; | |
85c898db RR |
1953 | |
1954 | frob_text(&mod->core_layout, set_memory_ro); | |
1955 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb | 1956 | } |
1957 | mutex_unlock(&module_mutex); | |
1958 | } | |
85c898db RR |
1959 | |
1960 | static void disable_ro_nx(const struct module_layout *layout) | |
1961 | { | |
1962 | frob_text(layout, set_memory_rw); | |
1963 | frob_rodata(layout, set_memory_rw); | |
1964 | frob_rodata(layout, set_memory_x); | |
1965 | frob_writable_data(layout, set_memory_x); | |
1966 | } | |
1967 | ||
84e1c6bb | 1968 | #else |
85c898db RR |
1969 | static void disable_ro_nx(const struct module_layout *layout) { } |
1970 | static void module_enable_nx(const struct module *mod) { } | |
1971 | static void module_disable_nx(const struct module *mod) { } | |
84e1c6bb | 1972 | #endif |
1973 | ||
be1f221c | 1974 | void __weak module_memfree(void *module_region) |
74e08fcf JB |
1975 | { |
1976 | vfree(module_region); | |
1977 | } | |
1978 | ||
1979 | void __weak module_arch_cleanup(struct module *mod) | |
1980 | { | |
1981 | } | |
1982 | ||
d453cded RR |
1983 | void __weak module_arch_freeing_init(struct module *mod) |
1984 | { | |
1985 | } | |
1986 | ||
75676500 | 1987 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1988 | static void free_module(struct module *mod) |
1989 | { | |
7ead8b83 LZ |
1990 | trace_module_free(mod); |
1991 | ||
36b0360d | 1992 | mod_sysfs_teardown(mod); |
1da177e4 | 1993 | |
944a1fa0 RR |
1994 | /* We leave it in list to prevent duplicate loads, but make sure |
1995 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 1996 | mutex_lock(&module_mutex); |
944a1fa0 | 1997 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 1998 | mutex_unlock(&module_mutex); |
944a1fa0 | 1999 | |
b82bab4b JB |
2000 | /* Remove dynamic debug info */ |
2001 | ddebug_remove_module(mod->name); | |
2002 | ||
1da177e4 LT |
2003 | /* Arch-specific cleanup. */ |
2004 | module_arch_cleanup(mod); | |
2005 | ||
2006 | /* Module unload stuff */ | |
2007 | module_unload_free(mod); | |
2008 | ||
e180a6b7 RR |
2009 | /* Free any allocated parameters. */ |
2010 | destroy_params(mod->kp, mod->num_kp); | |
2011 | ||
944a1fa0 RR |
2012 | /* Now we can delete it from the lists */ |
2013 | mutex_lock(&module_mutex); | |
461e34ae MH |
2014 | /* Unlink carefully: kallsyms could be walking list. */ |
2015 | list_del_rcu(&mod->list); | |
93c2e105 | 2016 | mod_tree_remove(mod); |
0286b5ea | 2017 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2018 | module_bug_cleanup(mod); |
0be964be PZ |
2019 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
2020 | synchronize_sched(); | |
944a1fa0 RR |
2021 | mutex_unlock(&module_mutex); |
2022 | ||
85c898db RR |
2023 | /* This may be empty, but that's OK */ |
2024 | disable_ro_nx(&mod->init_layout); | |
d453cded | 2025 | module_arch_freeing_init(mod); |
7523e4dc | 2026 | module_memfree(mod->init_layout.base); |
1da177e4 | 2027 | kfree(mod->args); |
259354de | 2028 | percpu_modfree(mod); |
9f85a4bb | 2029 | |
35a9393c | 2030 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2031 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2032 | |
1da177e4 | 2033 | /* Finally, free the core (containing the module structure) */ |
85c898db | 2034 | disable_ro_nx(&mod->core_layout); |
7523e4dc | 2035 | module_memfree(mod->core_layout.base); |
eb8cdec4 BS |
2036 | |
2037 | #ifdef CONFIG_MPU | |
2038 | update_protections(current->mm); | |
2039 | #endif | |
1da177e4 LT |
2040 | } |
2041 | ||
2042 | void *__symbol_get(const char *symbol) | |
2043 | { | |
2044 | struct module *owner; | |
414fd31b | 2045 | const struct kernel_symbol *sym; |
1da177e4 | 2046 | |
24da1cbf | 2047 | preempt_disable(); |
414fd31b TA |
2048 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2049 | if (sym && strong_try_module_get(owner)) | |
2050 | sym = NULL; | |
24da1cbf | 2051 | preempt_enable(); |
1da177e4 | 2052 | |
414fd31b | 2053 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
2054 | } |
2055 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2056 | ||
eea8b54d AN |
2057 | /* |
2058 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2059 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2060 | * |
2061 | * You must hold the module_mutex. | |
eea8b54d AN |
2062 | */ |
2063 | static int verify_export_symbols(struct module *mod) | |
2064 | { | |
b211104d | 2065 | unsigned int i; |
eea8b54d | 2066 | struct module *owner; |
b211104d RR |
2067 | const struct kernel_symbol *s; |
2068 | struct { | |
2069 | const struct kernel_symbol *sym; | |
2070 | unsigned int num; | |
2071 | } arr[] = { | |
2072 | { mod->syms, mod->num_syms }, | |
2073 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2074 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2075 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2076 | { mod->unused_syms, mod->num_unused_syms }, |
2077 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2078 | #endif |
b211104d | 2079 | }; |
eea8b54d | 2080 | |
b211104d RR |
2081 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2082 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 2083 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 2084 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
2085 | " (owned by %s)\n", |
2086 | mod->name, s->name, module_name(owner)); | |
2087 | return -ENOEXEC; | |
2088 | } | |
eea8b54d | 2089 | } |
b211104d RR |
2090 | } |
2091 | return 0; | |
eea8b54d AN |
2092 | } |
2093 | ||
9a4b9708 | 2094 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2095 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2096 | { | |
2097 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2098 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2099 | unsigned long secbase; |
49668688 | 2100 | unsigned int i; |
1da177e4 | 2101 | int ret = 0; |
414fd31b | 2102 | const struct kernel_symbol *ksym; |
1da177e4 | 2103 | |
49668688 RR |
2104 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2105 | const char *name = info->strtab + sym[i].st_name; | |
2106 | ||
1da177e4 LT |
2107 | switch (sym[i].st_shndx) { |
2108 | case SHN_COMMON: | |
80375980 JM |
2109 | /* Ignore common symbols */ |
2110 | if (!strncmp(name, "__gnu_lto", 9)) | |
2111 | break; | |
2112 | ||
1da177e4 LT |
2113 | /* We compiled with -fno-common. These are not |
2114 | supposed to happen. */ | |
5e124169 | 2115 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2116 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2117 | mod->name); |
2118 | ret = -ENOEXEC; | |
2119 | break; | |
2120 | ||
2121 | case SHN_ABS: | |
2122 | /* Don't need to do anything */ | |
5e124169 | 2123 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2124 | (long)sym[i].st_value); |
2125 | break; | |
2126 | ||
2127 | case SHN_UNDEF: | |
49668688 | 2128 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2129 | /* Ok if resolved. */ |
9bea7f23 | 2130 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 2131 | sym[i].st_value = ksym->value; |
1da177e4 | 2132 | break; |
414fd31b TA |
2133 | } |
2134 | ||
1da177e4 | 2135 | /* Ok if weak. */ |
9bea7f23 | 2136 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2137 | break; |
2138 | ||
bddb12b3 AM |
2139 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
2140 | mod->name, name, PTR_ERR(ksym)); | |
9bea7f23 | 2141 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
2142 | break; |
2143 | ||
2144 | default: | |
2145 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2146 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2147 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2148 | else |
49668688 | 2149 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2150 | sym[i].st_value += secbase; |
2151 | break; | |
2152 | } | |
2153 | } | |
2154 | ||
2155 | return ret; | |
2156 | } | |
2157 | ||
49668688 | 2158 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2159 | { |
2160 | unsigned int i; | |
2161 | int err = 0; | |
2162 | ||
2163 | /* Now do relocations. */ | |
49668688 RR |
2164 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2165 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2166 | |
2167 | /* Not a valid relocation section? */ | |
49668688 | 2168 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2169 | continue; |
2170 | ||
2171 | /* Don't bother with non-allocated sections */ | |
49668688 | 2172 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2173 | continue; |
2174 | ||
49668688 RR |
2175 | if (info->sechdrs[i].sh_type == SHT_REL) |
2176 | err = apply_relocate(info->sechdrs, info->strtab, | |
2177 | info->index.sym, i, mod); | |
2178 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2179 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2180 | info->index.sym, i, mod); | |
22e268eb RR |
2181 | if (err < 0) |
2182 | break; | |
2183 | } | |
2184 | return err; | |
2185 | } | |
2186 | ||
088af9a6 HD |
2187 | /* Additional bytes needed by arch in front of individual sections */ |
2188 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2189 | unsigned int section) | |
2190 | { | |
2191 | /* default implementation just returns zero */ | |
2192 | return 0; | |
2193 | } | |
2194 | ||
1da177e4 | 2195 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2196 | static long get_offset(struct module *mod, unsigned int *size, |
2197 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2198 | { |
2199 | long ret; | |
2200 | ||
088af9a6 | 2201 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2202 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2203 | *size = ret + sechdr->sh_size; | |
2204 | return ret; | |
2205 | } | |
2206 | ||
2207 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2208 | might -- code, read-only data, read-write data, small data. Tally | |
2209 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2210 | belongs in init. */ | |
49668688 | 2211 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2212 | { |
2213 | static unsigned long const masks[][2] = { | |
2214 | /* NOTE: all executable code must be the first section | |
2215 | * in this array; otherwise modify the text_size | |
2216 | * finder in the two loops below */ | |
2217 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2218 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
2219 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2220 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2221 | }; | |
2222 | unsigned int m, i; | |
2223 | ||
49668688 RR |
2224 | for (i = 0; i < info->hdr->e_shnum; i++) |
2225 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2226 | |
5e124169 | 2227 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2228 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2229 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2230 | Elf_Shdr *s = &info->sechdrs[i]; | |
2231 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2232 | |
2233 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2234 | || (s->sh_flags & masks[m][1]) | |
2235 | || s->sh_entsize != ~0UL | |
49668688 | 2236 | || strstarts(sname, ".init")) |
1da177e4 | 2237 | continue; |
7523e4dc | 2238 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2239 | pr_debug("\t%s\n", sname); |
1da177e4 | 2240 | } |
84e1c6bb | 2241 | switch (m) { |
2242 | case 0: /* executable */ | |
7523e4dc RR |
2243 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2244 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb | 2245 | break; |
2246 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2247 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2248 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2249 | break; |
2250 | case 3: /* whole core */ | |
7523e4dc | 2251 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb | 2252 | break; |
2253 | } | |
1da177e4 LT |
2254 | } |
2255 | ||
5e124169 | 2256 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2257 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2258 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2259 | Elf_Shdr *s = &info->sechdrs[i]; | |
2260 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2261 | |
2262 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2263 | || (s->sh_flags & masks[m][1]) | |
2264 | || s->sh_entsize != ~0UL | |
49668688 | 2265 | || !strstarts(sname, ".init")) |
1da177e4 | 2266 | continue; |
7523e4dc | 2267 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2268 | | INIT_OFFSET_MASK); |
5e124169 | 2269 | pr_debug("\t%s\n", sname); |
1da177e4 | 2270 | } |
84e1c6bb | 2271 | switch (m) { |
2272 | case 0: /* executable */ | |
7523e4dc RR |
2273 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2274 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb | 2275 | break; |
2276 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2277 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2278 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2279 | break; |
2280 | case 3: /* whole init */ | |
7523e4dc | 2281 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb | 2282 | break; |
2283 | } | |
1da177e4 LT |
2284 | } |
2285 | } | |
2286 | ||
1da177e4 LT |
2287 | static void set_license(struct module *mod, const char *license) |
2288 | { | |
2289 | if (!license) | |
2290 | license = "unspecified"; | |
2291 | ||
fa3ba2e8 | 2292 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2293 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2294 | pr_warn("%s: module license '%s' taints kernel.\n", |
2295 | mod->name, license); | |
373d4d09 RR |
2296 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2297 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2298 | } |
2299 | } | |
2300 | ||
2301 | /* Parse tag=value strings from .modinfo section */ | |
2302 | static char *next_string(char *string, unsigned long *secsize) | |
2303 | { | |
2304 | /* Skip non-zero chars */ | |
2305 | while (string[0]) { | |
2306 | string++; | |
2307 | if ((*secsize)-- <= 1) | |
2308 | return NULL; | |
2309 | } | |
2310 | ||
2311 | /* Skip any zero padding. */ | |
2312 | while (!string[0]) { | |
2313 | string++; | |
2314 | if ((*secsize)-- <= 1) | |
2315 | return NULL; | |
2316 | } | |
2317 | return string; | |
2318 | } | |
2319 | ||
49668688 | 2320 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2321 | { |
2322 | char *p; | |
2323 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2324 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2325 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2326 | |
49668688 | 2327 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2328 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2329 | return p + taglen + 1; | |
2330 | } | |
2331 | return NULL; | |
2332 | } | |
2333 | ||
49668688 | 2334 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2335 | { |
2336 | struct module_attribute *attr; | |
2337 | int i; | |
2338 | ||
2339 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2340 | if (attr->setup) | |
49668688 | 2341 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2342 | } |
2343 | } | |
c988d2b2 | 2344 | |
a263f776 RR |
2345 | static void free_modinfo(struct module *mod) |
2346 | { | |
2347 | struct module_attribute *attr; | |
2348 | int i; | |
2349 | ||
2350 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2351 | if (attr->free) | |
2352 | attr->free(mod); | |
2353 | } | |
2354 | } | |
2355 | ||
1da177e4 | 2356 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2357 | |
2358 | /* lookup symbol in given range of kernel_symbols */ | |
2359 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2360 | const struct kernel_symbol *start, | |
2361 | const struct kernel_symbol *stop) | |
2362 | { | |
9d63487f AIB |
2363 | return bsearch(name, start, stop - start, |
2364 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2365 | } |
2366 | ||
ca4787b7 TA |
2367 | static int is_exported(const char *name, unsigned long value, |
2368 | const struct module *mod) | |
1da177e4 | 2369 | { |
ca4787b7 TA |
2370 | const struct kernel_symbol *ks; |
2371 | if (!mod) | |
2372 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2373 | else |
ca4787b7 TA |
2374 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2375 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2376 | } |
2377 | ||
2378 | /* As per nm */ | |
eded41c1 | 2379 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2380 | { |
eded41c1 RR |
2381 | const Elf_Shdr *sechdrs = info->sechdrs; |
2382 | ||
1da177e4 LT |
2383 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2384 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2385 | return 'v'; | |
2386 | else | |
2387 | return 'w'; | |
2388 | } | |
2389 | if (sym->st_shndx == SHN_UNDEF) | |
2390 | return 'U'; | |
e0224418 | 2391 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2392 | return 'a'; |
2393 | if (sym->st_shndx >= SHN_LORESERVE) | |
2394 | return '?'; | |
2395 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2396 | return 't'; | |
2397 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2398 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2399 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2400 | return 'r'; | |
2401 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2402 | return 'g'; | |
2403 | else | |
2404 | return 'd'; | |
2405 | } | |
2406 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2407 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2408 | return 's'; | |
2409 | else | |
2410 | return 'b'; | |
2411 | } | |
eded41c1 RR |
2412 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2413 | ".debug")) { | |
1da177e4 | 2414 | return 'n'; |
eded41c1 | 2415 | } |
1da177e4 LT |
2416 | return '?'; |
2417 | } | |
2418 | ||
4a496226 | 2419 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2420 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2421 | { |
2422 | const Elf_Shdr *sec; | |
2423 | ||
2424 | if (src->st_shndx == SHN_UNDEF | |
2425 | || src->st_shndx >= shnum | |
2426 | || !src->st_name) | |
2427 | return false; | |
2428 | ||
e0224418 MB |
2429 | #ifdef CONFIG_KALLSYMS_ALL |
2430 | if (src->st_shndx == pcpundx) | |
2431 | return true; | |
2432 | #endif | |
2433 | ||
4a496226 JB |
2434 | sec = sechdrs + src->st_shndx; |
2435 | if (!(sec->sh_flags & SHF_ALLOC) | |
2436 | #ifndef CONFIG_KALLSYMS_ALL | |
2437 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2438 | #endif | |
2439 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2440 | return false; | |
2441 | ||
2442 | return true; | |
2443 | } | |
2444 | ||
48fd1188 KC |
2445 | /* |
2446 | * We only allocate and copy the strings needed by the parts of symtab | |
2447 | * we keep. This is simple, but has the effect of making multiple | |
2448 | * copies of duplicates. We could be more sophisticated, see | |
2449 | * linux-kernel thread starting with | |
2450 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2451 | */ | |
49668688 | 2452 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2453 | { |
49668688 RR |
2454 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2455 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2456 | const Elf_Sym *src; |
54523ec7 | 2457 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2458 | |
2459 | /* Put symbol section at end of init part of module. */ | |
2460 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2461 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2462 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2463 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2464 | |
49668688 | 2465 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2466 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2467 | |
48fd1188 | 2468 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 RR |
2469 | for (ndst = i = 0; i < nsrc; i++) { |
2470 | if (i == 0 || | |
e0224418 MB |
2471 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2472 | info->index.pcpu)) { | |
59ef28b1 | 2473 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2474 | ndst++; |
554bdfe5 | 2475 | } |
59ef28b1 | 2476 | } |
4a496226 JB |
2477 | |
2478 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2479 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2480 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2481 | mod->core_layout.size += strtab_size; | |
2482 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
4a496226 | 2483 | |
554bdfe5 JB |
2484 | /* Put string table section at end of init part of module. */ |
2485 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2486 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2487 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2488 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2489 | |
2490 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2491 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2492 | __alignof__(struct mod_kallsyms)); | |
2493 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2494 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
2495 | mod->init_layout.size = debug_align(mod->init_layout.size); | |
4a496226 JB |
2496 | } |
2497 | ||
8244062e RR |
2498 | /* |
2499 | * We use the full symtab and strtab which layout_symtab arranged to | |
2500 | * be appended to the init section. Later we switch to the cut-down | |
2501 | * core-only ones. | |
2502 | */ | |
811d66a0 | 2503 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2504 | { |
4a496226 JB |
2505 | unsigned int i, ndst; |
2506 | const Elf_Sym *src; | |
2507 | Elf_Sym *dst; | |
554bdfe5 | 2508 | char *s; |
eded41c1 | 2509 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2510 | |
8244062e RR |
2511 | /* Set up to point into init section. */ |
2512 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2513 | ||
2514 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2515 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2516 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2517 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1da177e4 LT |
2518 | |
2519 | /* Set types up while we still have access to sections. */ | |
8244062e RR |
2520 | for (i = 0; i < mod->kallsyms->num_symtab; i++) |
2521 | mod->kallsyms->symtab[i].st_info | |
2522 | = elf_type(&mod->kallsyms->symtab[i], info); | |
2523 | ||
2524 | /* Now populate the cut down core kallsyms for after init. */ | |
2525 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; | |
2526 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
2527 | src = mod->kallsyms->symtab; | |
2528 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
59ef28b1 | 2529 | if (i == 0 || |
e0224418 MB |
2530 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2531 | info->index.pcpu)) { | |
59ef28b1 | 2532 | dst[ndst] = src[i]; |
8244062e RR |
2533 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2534 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2535 | KSYM_NAME_LEN) + 1; |
2536 | } | |
4a496226 | 2537 | } |
8244062e | 2538 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2539 | } |
2540 | #else | |
49668688 | 2541 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2542 | { |
2543 | } | |
3ae91c21 | 2544 | |
abbce906 | 2545 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2546 | { |
2547 | } | |
2548 | #endif /* CONFIG_KALLSYMS */ | |
2549 | ||
e9d376f0 | 2550 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2551 | { |
811d66a0 RR |
2552 | if (!debug) |
2553 | return; | |
e9d376f0 JB |
2554 | #ifdef CONFIG_DYNAMIC_DEBUG |
2555 | if (ddebug_add_module(debug, num, debug->modname)) | |
bddb12b3 AM |
2556 | pr_err("dynamic debug error adding module: %s\n", |
2557 | debug->modname); | |
e9d376f0 | 2558 | #endif |
5e458cc0 | 2559 | } |
346e15be | 2560 | |
ff49d74a YS |
2561 | static void dynamic_debug_remove(struct _ddebug *debug) |
2562 | { | |
2563 | if (debug) | |
2564 | ddebug_remove_module(debug->modname); | |
2565 | } | |
2566 | ||
74e08fcf JB |
2567 | void * __weak module_alloc(unsigned long size) |
2568 | { | |
82fab442 | 2569 | return vmalloc_exec(size); |
74e08fcf JB |
2570 | } |
2571 | ||
4f2294b6 | 2572 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2573 | static void kmemleak_load_module(const struct module *mod, |
2574 | const struct load_info *info) | |
4f2294b6 CM |
2575 | { |
2576 | unsigned int i; | |
2577 | ||
2578 | /* only scan the sections containing data */ | |
c017b4be | 2579 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2580 | |
49668688 | 2581 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2582 | /* Scan all writable sections that's not executable */ |
2583 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2584 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2585 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2586 | continue; |
2587 | ||
49668688 RR |
2588 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2589 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2590 | } |
2591 | } | |
2592 | #else | |
49668688 RR |
2593 | static inline void kmemleak_load_module(const struct module *mod, |
2594 | const struct load_info *info) | |
4f2294b6 CM |
2595 | { |
2596 | } | |
2597 | #endif | |
2598 | ||
106a4ee2 | 2599 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2600 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2601 | { |
2602 | int err = -ENOKEY; | |
34e1169d KC |
2603 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2604 | const void *mod = info->hdr; | |
caabe240 | 2605 | |
34e1169d KC |
2606 | if (info->len > markerlen && |
2607 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { | |
caabe240 | 2608 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2609 | info->len -= markerlen; |
2610 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2611 | } |
2612 | ||
2613 | if (!err) { | |
2614 | info->sig_ok = true; | |
2615 | return 0; | |
2616 | } | |
2617 | ||
2618 | /* Not having a signature is only an error if we're strict. */ | |
2619 | if (err == -ENOKEY && !sig_enforce) | |
2620 | err = 0; | |
2621 | ||
2622 | return err; | |
2623 | } | |
2624 | #else /* !CONFIG_MODULE_SIG */ | |
34e1169d | 2625 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2626 | { |
2627 | return 0; | |
2628 | } | |
2629 | #endif /* !CONFIG_MODULE_SIG */ | |
2630 | ||
34e1169d KC |
2631 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2632 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2633 | { |
34e1169d KC |
2634 | if (info->len < sizeof(*(info->hdr))) |
2635 | return -ENOEXEC; | |
2636 | ||
2637 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2638 | || info->hdr->e_type != ET_REL | |
2639 | || !elf_check_arch(info->hdr) | |
2640 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2641 | return -ENOEXEC; | |
2642 | ||
2643 | if (info->hdr->e_shoff >= info->len | |
2644 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2645 | info->len - info->hdr->e_shoff)) | |
2646 | return -ENOEXEC; | |
40dd2560 | 2647 | |
34e1169d KC |
2648 | return 0; |
2649 | } | |
2650 | ||
3afe9f84 LT |
2651 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2652 | ||
2653 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2654 | { | |
2655 | do { | |
2656 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2657 | ||
2658 | if (copy_from_user(dst, usrc, n) != 0) | |
2659 | return -EFAULT; | |
2660 | cond_resched(); | |
2661 | dst += n; | |
2662 | usrc += n; | |
2663 | len -= n; | |
2664 | } while (len); | |
2665 | return 0; | |
2666 | } | |
2667 | ||
34e1169d KC |
2668 | /* Sets info->hdr and info->len. */ |
2669 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2670 | struct load_info *info) | |
40dd2560 RR |
2671 | { |
2672 | int err; | |
40dd2560 | 2673 | |
34e1169d KC |
2674 | info->len = len; |
2675 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2676 | return -ENOEXEC; |
2677 | ||
2e72d51b KC |
2678 | err = security_kernel_module_from_file(NULL); |
2679 | if (err) | |
2680 | return err; | |
2681 | ||
40dd2560 | 2682 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d KS |
2683 | info->hdr = __vmalloc(info->len, |
2684 | GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN, PAGE_KERNEL); | |
34e1169d | 2685 | if (!info->hdr) |
40dd2560 RR |
2686 | return -ENOMEM; |
2687 | ||
3afe9f84 | 2688 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2689 | vfree(info->hdr); |
2690 | return -EFAULT; | |
40dd2560 RR |
2691 | } |
2692 | ||
34e1169d KC |
2693 | return 0; |
2694 | } | |
2695 | ||
2696 | /* Sets info->hdr and info->len. */ | |
2697 | static int copy_module_from_fd(int fd, struct load_info *info) | |
2698 | { | |
a2e0578b | 2699 | struct fd f = fdget(fd); |
34e1169d KC |
2700 | int err; |
2701 | struct kstat stat; | |
2702 | loff_t pos; | |
2703 | ssize_t bytes = 0; | |
2704 | ||
a2e0578b | 2705 | if (!f.file) |
34e1169d KC |
2706 | return -ENOEXEC; |
2707 | ||
a2e0578b | 2708 | err = security_kernel_module_from_file(f.file); |
106a4ee2 | 2709 | if (err) |
2e72d51b | 2710 | goto out; |
106a4ee2 | 2711 | |
a2e0578b | 2712 | err = vfs_getattr(&f.file->f_path, &stat); |
106a4ee2 | 2713 | if (err) |
34e1169d | 2714 | goto out; |
40dd2560 | 2715 | |
34e1169d KC |
2716 | if (stat.size > INT_MAX) { |
2717 | err = -EFBIG; | |
2718 | goto out; | |
40dd2560 | 2719 | } |
52441fa8 SL |
2720 | |
2721 | /* Don't hand 0 to vmalloc, it whines. */ | |
2722 | if (stat.size == 0) { | |
2723 | err = -EINVAL; | |
2724 | goto out; | |
2725 | } | |
2726 | ||
34e1169d KC |
2727 | info->hdr = vmalloc(stat.size); |
2728 | if (!info->hdr) { | |
2729 | err = -ENOMEM; | |
2730 | goto out; | |
40dd2560 | 2731 | } |
d913188c | 2732 | |
34e1169d KC |
2733 | pos = 0; |
2734 | while (pos < stat.size) { | |
a2e0578b | 2735 | bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos, |
34e1169d KC |
2736 | stat.size - pos); |
2737 | if (bytes < 0) { | |
2738 | vfree(info->hdr); | |
2739 | err = bytes; | |
2740 | goto out; | |
2741 | } | |
2742 | if (bytes == 0) | |
2743 | break; | |
2744 | pos += bytes; | |
2745 | } | |
2746 | info->len = pos; | |
40dd2560 | 2747 | |
34e1169d | 2748 | out: |
a2e0578b | 2749 | fdput(f); |
40dd2560 RR |
2750 | return err; |
2751 | } | |
2752 | ||
d913188c RR |
2753 | static void free_copy(struct load_info *info) |
2754 | { | |
d913188c RR |
2755 | vfree(info->hdr); |
2756 | } | |
2757 | ||
2f3238ae | 2758 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2759 | { |
2760 | unsigned int i; | |
2761 | ||
2762 | /* This should always be true, but let's be sure. */ | |
2763 | info->sechdrs[0].sh_addr = 0; | |
2764 | ||
2765 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2766 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2767 | if (shdr->sh_type != SHT_NOBITS | |
2768 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2769 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2770 | return -ENOEXEC; |
2771 | } | |
2772 | ||
2773 | /* Mark all sections sh_addr with their address in the | |
2774 | temporary image. */ | |
2775 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2776 | ||
2777 | #ifndef CONFIG_MODULE_UNLOAD | |
2778 | /* Don't load .exit sections */ | |
2779 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2780 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2781 | #endif | |
8b5f61a7 | 2782 | } |
d6df72a0 RR |
2783 | |
2784 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2785 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2786 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2787 | else | |
2788 | info->index.vers = find_sec(info, "__versions"); | |
49668688 | 2789 | info->index.info = find_sec(info, ".modinfo"); |
d6df72a0 RR |
2790 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2791 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2792 | return 0; |
2793 | } | |
2794 | ||
3264d3f9 LT |
2795 | /* |
2796 | * Set up our basic convenience variables (pointers to section headers, | |
2797 | * search for module section index etc), and do some basic section | |
2798 | * verification. | |
2799 | * | |
2800 | * Return the temporary module pointer (we'll replace it with the final | |
2801 | * one when we move the module sections around). | |
2802 | */ | |
2f3238ae | 2803 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2804 | { |
2805 | unsigned int i; | |
8b5f61a7 | 2806 | int err; |
3264d3f9 LT |
2807 | struct module *mod; |
2808 | ||
2809 | /* Set up the convenience variables */ | |
2810 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2811 | info->secstrings = (void *)info->hdr |
2812 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2813 | |
2f3238ae | 2814 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2815 | if (err) |
2816 | return ERR_PTR(err); | |
3264d3f9 | 2817 | |
8b5f61a7 RR |
2818 | /* Find internal symbols and strings. */ |
2819 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2820 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2821 | info->index.sym = i; | |
2822 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2823 | info->strtab = (char *)info->hdr |
2824 | + info->sechdrs[info->index.str].sh_offset; | |
2825 | break; | |
3264d3f9 | 2826 | } |
3264d3f9 LT |
2827 | } |
2828 | ||
49668688 | 2829 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2830 | if (!info->index.mod) { |
bddb12b3 | 2831 | pr_warn("No module found in object\n"); |
3264d3f9 LT |
2832 | return ERR_PTR(-ENOEXEC); |
2833 | } | |
2834 | /* This is temporary: point mod into copy of data. */ | |
2835 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2836 | ||
2837 | if (info->index.sym == 0) { | |
bddb12b3 | 2838 | pr_warn("%s: module has no symbols (stripped?)\n", mod->name); |
3264d3f9 LT |
2839 | return ERR_PTR(-ENOEXEC); |
2840 | } | |
2841 | ||
49668688 | 2842 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2843 | |
3264d3f9 LT |
2844 | /* Check module struct version now, before we try to use module. */ |
2845 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2846 | return ERR_PTR(-ENOEXEC); | |
2847 | ||
2848 | return mod; | |
3264d3f9 LT |
2849 | } |
2850 | ||
2f3238ae | 2851 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2852 | { |
49668688 | 2853 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2854 | int err; |
2855 | ||
2f3238ae RR |
2856 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2857 | modmagic = NULL; | |
2858 | ||
40dd2560 RR |
2859 | /* This is allowed: modprobe --force will invalidate it. */ |
2860 | if (!modmagic) { | |
2861 | err = try_to_force_load(mod, "bad vermagic"); | |
2862 | if (err) | |
2863 | return err; | |
49668688 | 2864 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 2865 | pr_err("%s: version magic '%s' should be '%s'\n", |
40dd2560 RR |
2866 | mod->name, modmagic, vermagic); |
2867 | return -ENOEXEC; | |
2868 | } | |
2869 | ||
2449b8ba | 2870 | if (!get_modinfo(info, "intree")) |
373d4d09 | 2871 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
2449b8ba | 2872 | |
49668688 | 2873 | if (get_modinfo(info, "staging")) { |
373d4d09 | 2874 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
2875 | pr_warn("%s: module is from the staging directory, the quality " |
2876 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 2877 | } |
22e268eb RR |
2878 | |
2879 | /* Set up license info based on the info section */ | |
49668688 | 2880 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2881 | |
40dd2560 RR |
2882 | return 0; |
2883 | } | |
2884 | ||
eb3057df | 2885 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2886 | { |
49668688 | 2887 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2888 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2889 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2890 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2891 | mod->crcs = section_addr(info, "__kcrctab"); |
2892 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2893 | sizeof(*mod->gpl_syms), |
2894 | &mod->num_gpl_syms); | |
49668688 RR |
2895 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2896 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2897 | "__ksymtab_gpl_future", |
2898 | sizeof(*mod->gpl_future_syms), | |
2899 | &mod->num_gpl_future_syms); | |
49668688 | 2900 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2901 | |
2902 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2903 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2904 | sizeof(*mod->unused_syms), |
2905 | &mod->num_unused_syms); | |
49668688 RR |
2906 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2907 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2908 | sizeof(*mod->unused_gpl_syms), |
2909 | &mod->num_unused_gpl_syms); | |
49668688 | 2910 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2911 | #endif |
2912 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2913 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 2914 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
2915 | if (!mod->ctors) |
2916 | mod->ctors = section_objs(info, ".init_array", | |
2917 | sizeof(*mod->ctors), &mod->num_ctors); | |
2918 | else if (find_sec(info, ".init_array")) { | |
2919 | /* | |
2920 | * This shouldn't happen with same compiler and binutils | |
2921 | * building all parts of the module. | |
2922 | */ | |
6da0b565 | 2923 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
2924 | mod->name); |
2925 | return -EINVAL; | |
2926 | } | |
f91a13bb LT |
2927 | #endif |
2928 | ||
2929 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2930 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2931 | sizeof(*mod->tracepoints_ptrs), | |
2932 | &mod->num_tracepoints); | |
f91a13bb | 2933 | #endif |
bf5438fc JB |
2934 | #ifdef HAVE_JUMP_LABEL |
2935 | mod->jump_entries = section_objs(info, "__jump_table", | |
2936 | sizeof(*mod->jump_entries), | |
2937 | &mod->num_jump_entries); | |
2938 | #endif | |
f91a13bb | 2939 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2940 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2941 | sizeof(*mod->trace_events), |
2942 | &mod->num_trace_events); | |
3673b8e4 SRRH |
2943 | mod->trace_enums = section_objs(info, "_ftrace_enum_map", |
2944 | sizeof(*mod->trace_enums), | |
2945 | &mod->num_trace_enums); | |
f91a13bb | 2946 | #endif |
13b9b6e7 SR |
2947 | #ifdef CONFIG_TRACING |
2948 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2949 | sizeof(*mod->trace_bprintk_fmt_start), | |
2950 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 2951 | #endif |
f91a13bb LT |
2952 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2953 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2954 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2955 | sizeof(*mod->ftrace_callsites), |
2956 | &mod->num_ftrace_callsites); | |
2957 | #endif | |
22e268eb | 2958 | |
811d66a0 RR |
2959 | mod->extable = section_objs(info, "__ex_table", |
2960 | sizeof(*mod->extable), &mod->num_exentries); | |
2961 | ||
49668688 | 2962 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 2963 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
2964 | |
2965 | info->debug = section_objs(info, "__verbose", | |
2966 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
2967 | |
2968 | return 0; | |
f91a13bb LT |
2969 | } |
2970 | ||
49668688 | 2971 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2972 | { |
2973 | int i; | |
2974 | void *ptr; | |
2975 | ||
2976 | /* Do the allocs. */ | |
7523e4dc | 2977 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
2978 | /* |
2979 | * The pointer to this block is stored in the module structure | |
2980 | * which is inside the block. Just mark it as not being a | |
2981 | * leak. | |
2982 | */ | |
2983 | kmemleak_not_leak(ptr); | |
2984 | if (!ptr) | |
d913188c | 2985 | return -ENOMEM; |
65b8a9b4 | 2986 | |
7523e4dc RR |
2987 | memset(ptr, 0, mod->core_layout.size); |
2988 | mod->core_layout.base = ptr; | |
65b8a9b4 | 2989 | |
7523e4dc RR |
2990 | if (mod->init_layout.size) { |
2991 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
2992 | /* |
2993 | * The pointer to this block is stored in the module structure | |
2994 | * which is inside the block. This block doesn't need to be | |
2995 | * scanned as it contains data and code that will be freed | |
2996 | * after the module is initialized. | |
2997 | */ | |
2998 | kmemleak_ignore(ptr); | |
2999 | if (!ptr) { | |
7523e4dc | 3000 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3001 | return -ENOMEM; |
3002 | } | |
7523e4dc RR |
3003 | memset(ptr, 0, mod->init_layout.size); |
3004 | mod->init_layout.base = ptr; | |
82fab442 | 3005 | } else |
7523e4dc | 3006 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3007 | |
3008 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3009 | pr_debug("final section addresses:\n"); |
49668688 | 3010 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3011 | void *dest; |
49668688 | 3012 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3013 | |
49668688 | 3014 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3015 | continue; |
3016 | ||
49668688 | 3017 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3018 | dest = mod->init_layout.base |
49668688 | 3019 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3020 | else |
7523e4dc | 3021 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3022 | |
49668688 RR |
3023 | if (shdr->sh_type != SHT_NOBITS) |
3024 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3025 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3026 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3027 | pr_debug("\t0x%lx %s\n", |
3028 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3029 | } |
d913188c RR |
3030 | |
3031 | return 0; | |
65b8a9b4 LT |
3032 | } |
3033 | ||
49668688 | 3034 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
3035 | { |
3036 | /* | |
3037 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3038 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3039 | * using GPL-only symbols it needs. | |
3040 | */ | |
3041 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3042 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3043 | |
3044 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3045 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3046 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3047 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3048 | |
c99af375 MG |
3049 | /* lve claims to be GPL but upstream won't provide source */ |
3050 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3051 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3052 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3053 | |
22e268eb RR |
3054 | #ifdef CONFIG_MODVERSIONS |
3055 | if ((mod->num_syms && !mod->crcs) | |
3056 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3057 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3058 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3059 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3060 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3061 | #endif | |
3062 | ) { | |
3063 | return try_to_force_load(mod, | |
3064 | "no versions for exported symbols"); | |
3065 | } | |
3066 | #endif | |
3067 | return 0; | |
3068 | } | |
3069 | ||
3070 | static void flush_module_icache(const struct module *mod) | |
3071 | { | |
3072 | mm_segment_t old_fs; | |
3073 | ||
3074 | /* flush the icache in correct context */ | |
3075 | old_fs = get_fs(); | |
3076 | set_fs(KERNEL_DS); | |
3077 | ||
3078 | /* | |
3079 | * Flush the instruction cache, since we've played with text. | |
3080 | * Do it before processing of module parameters, so the module | |
3081 | * can provide parameter accessor functions of its own. | |
3082 | */ | |
7523e4dc RR |
3083 | if (mod->init_layout.base) |
3084 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3085 | (unsigned long)mod->init_layout.base | |
3086 | + mod->init_layout.size); | |
3087 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3088 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3089 | |
3090 | set_fs(old_fs); | |
3091 | } | |
3092 | ||
74e08fcf JB |
3093 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3094 | Elf_Shdr *sechdrs, | |
3095 | char *secstrings, | |
3096 | struct module *mod) | |
3097 | { | |
3098 | return 0; | |
3099 | } | |
3100 | ||
2f3238ae | 3101 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3102 | { |
d913188c | 3103 | /* Module within temporary copy. */ |
1da177e4 | 3104 | struct module *mod; |
d913188c | 3105 | int err; |
3ae91c21 | 3106 | |
2f3238ae | 3107 | mod = setup_load_info(info, flags); |
d913188c RR |
3108 | if (IS_ERR(mod)) |
3109 | return mod; | |
1da177e4 | 3110 | |
2f3238ae | 3111 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
3112 | if (err) |
3113 | return ERR_PTR(err); | |
1da177e4 | 3114 | |
1da177e4 | 3115 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
3116 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
3117 | info->secstrings, mod); | |
1da177e4 | 3118 | if (err < 0) |
8d8022e8 | 3119 | return ERR_PTR(err); |
1da177e4 | 3120 | |
8d8022e8 RR |
3121 | /* We will do a special allocation for per-cpu sections later. */ |
3122 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 LT |
3123 | |
3124 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
3125 | this is done generically; there doesn't appear to be any | |
3126 | special cases for the architectures. */ | |
49668688 | 3127 | layout_sections(mod, info); |
49668688 | 3128 | layout_symtab(mod, info); |
1da177e4 | 3129 | |
65b8a9b4 | 3130 | /* Allocate and move to the final place */ |
49668688 | 3131 | err = move_module(mod, info); |
d913188c | 3132 | if (err) |
8d8022e8 | 3133 | return ERR_PTR(err); |
d913188c RR |
3134 | |
3135 | /* Module has been copied to its final place now: return it. */ | |
3136 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3137 | kmemleak_load_module(mod, info); |
d913188c | 3138 | return mod; |
d913188c RR |
3139 | } |
3140 | ||
3141 | /* mod is no longer valid after this! */ | |
3142 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3143 | { | |
d913188c | 3144 | percpu_modfree(mod); |
d453cded | 3145 | module_arch_freeing_init(mod); |
7523e4dc RR |
3146 | module_memfree(mod->init_layout.base); |
3147 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3148 | } |
3149 | ||
74e08fcf JB |
3150 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3151 | const Elf_Shdr *sechdrs, | |
3152 | struct module *me) | |
3153 | { | |
3154 | return 0; | |
3155 | } | |
3156 | ||
811d66a0 RR |
3157 | static int post_relocation(struct module *mod, const struct load_info *info) |
3158 | { | |
51f3d0f4 | 3159 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3160 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3161 | ||
3162 | /* Copy relocated percpu area over. */ | |
3163 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3164 | info->sechdrs[info->index.pcpu].sh_size); | |
3165 | ||
51f3d0f4 | 3166 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3167 | add_kallsyms(mod, info); |
3168 | ||
3169 | /* Arch-specific module finalizing. */ | |
3170 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3171 | } | |
3172 | ||
9bb9c3be RR |
3173 | /* Is this module of this name done loading? No locks held. */ |
3174 | static bool finished_loading(const char *name) | |
3175 | { | |
3176 | struct module *mod; | |
3177 | bool ret; | |
3178 | ||
9cc019b8 PZ |
3179 | /* |
3180 | * The module_mutex should not be a heavily contended lock; | |
3181 | * if we get the occasional sleep here, we'll go an extra iteration | |
3182 | * in the wait_event_interruptible(), which is harmless. | |
3183 | */ | |
3184 | sched_annotate_sleep(); | |
9bb9c3be | 3185 | mutex_lock(&module_mutex); |
4f6de4d5 | 3186 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3187 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3188 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3189 | mutex_unlock(&module_mutex); |
3190 | ||
3191 | return ret; | |
3192 | } | |
3193 | ||
34e1169d KC |
3194 | /* Call module constructors. */ |
3195 | static void do_mod_ctors(struct module *mod) | |
3196 | { | |
3197 | #ifdef CONFIG_CONSTRUCTORS | |
3198 | unsigned long i; | |
3199 | ||
3200 | for (i = 0; i < mod->num_ctors; i++) | |
3201 | mod->ctors[i](); | |
3202 | #endif | |
3203 | } | |
3204 | ||
c7496379 RR |
3205 | /* For freeing module_init on success, in case kallsyms traversing */ |
3206 | struct mod_initfree { | |
3207 | struct rcu_head rcu; | |
3208 | void *module_init; | |
3209 | }; | |
3210 | ||
3211 | static void do_free_init(struct rcu_head *head) | |
3212 | { | |
3213 | struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); | |
3214 | module_memfree(m->module_init); | |
3215 | kfree(m); | |
3216 | } | |
3217 | ||
be02a186 JK |
3218 | /* |
3219 | * This is where the real work happens. | |
3220 | * | |
3221 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3222 | * helper command 'lx-symbols'. | |
3223 | */ | |
3224 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3225 | { |
3226 | int ret = 0; | |
c7496379 RR |
3227 | struct mod_initfree *freeinit; |
3228 | ||
3229 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3230 | if (!freeinit) { | |
3231 | ret = -ENOMEM; | |
3232 | goto fail; | |
3233 | } | |
7523e4dc | 3234 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3235 | |
774a1221 TH |
3236 | /* |
3237 | * We want to find out whether @mod uses async during init. Clear | |
3238 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3239 | */ | |
3240 | current->flags &= ~PF_USED_ASYNC; | |
3241 | ||
34e1169d KC |
3242 | do_mod_ctors(mod); |
3243 | /* Start the module */ | |
3244 | if (mod->init != NULL) | |
3245 | ret = do_one_initcall(mod->init); | |
3246 | if (ret < 0) { | |
c7496379 | 3247 | goto fail_free_freeinit; |
34e1169d KC |
3248 | } |
3249 | if (ret > 0) { | |
bddb12b3 AM |
3250 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3251 | "follow 0/-E convention\n" | |
3252 | "%s: loading module anyway...\n", | |
3253 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3254 | dump_stack(); |
3255 | } | |
3256 | ||
3257 | /* Now it's a first class citizen! */ | |
3258 | mod->state = MODULE_STATE_LIVE; | |
3259 | blocking_notifier_call_chain(&module_notify_list, | |
3260 | MODULE_STATE_LIVE, mod); | |
3261 | ||
774a1221 TH |
3262 | /* |
3263 | * We need to finish all async code before the module init sequence | |
3264 | * is done. This has potential to deadlock. For example, a newly | |
3265 | * detected block device can trigger request_module() of the | |
3266 | * default iosched from async probing task. Once userland helper | |
3267 | * reaches here, async_synchronize_full() will wait on the async | |
3268 | * task waiting on request_module() and deadlock. | |
3269 | * | |
3270 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3271 | * iff module init queued any async jobs. This isn't a full | |
3272 | * solution as it will deadlock the same if module loading from | |
3273 | * async jobs nests more than once; however, due to the various | |
3274 | * constraints, this hack seems to be the best option for now. | |
3275 | * Please refer to the following thread for details. | |
3276 | * | |
3277 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3278 | */ | |
f2411da7 | 3279 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3280 | async_synchronize_full(); |
34e1169d KC |
3281 | |
3282 | mutex_lock(&module_mutex); | |
3283 | /* Drop initial reference. */ | |
3284 | module_put(mod); | |
3285 | trim_init_extable(mod); | |
3286 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3287 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3288 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3289 | #endif |
93c2e105 | 3290 | mod_tree_remove_init(mod); |
85c898db | 3291 | disable_ro_nx(&mod->init_layout); |
d453cded | 3292 | module_arch_freeing_init(mod); |
7523e4dc RR |
3293 | mod->init_layout.base = NULL; |
3294 | mod->init_layout.size = 0; | |
3295 | mod->init_layout.ro_size = 0; | |
3296 | mod->init_layout.text_size = 0; | |
c7496379 RR |
3297 | /* |
3298 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be PZ |
3299 | * walking this with preempt disabled. In all the failure paths, we |
3300 | * call synchronize_sched(), but we don't want to slow down the success | |
3301 | * path, so use actual RCU here. | |
c7496379 | 3302 | */ |
0be964be | 3303 | call_rcu_sched(&freeinit->rcu, do_free_init); |
34e1169d KC |
3304 | mutex_unlock(&module_mutex); |
3305 | wake_up_all(&module_wq); | |
3306 | ||
3307 | return 0; | |
c7496379 RR |
3308 | |
3309 | fail_free_freeinit: | |
3310 | kfree(freeinit); | |
3311 | fail: | |
3312 | /* Try to protect us from buggy refcounters. */ | |
3313 | mod->state = MODULE_STATE_GOING; | |
3314 | synchronize_sched(); | |
3315 | module_put(mod); | |
3316 | blocking_notifier_call_chain(&module_notify_list, | |
3317 | MODULE_STATE_GOING, mod); | |
7dcd182b | 3318 | ftrace_release_mod(mod); |
c7496379 RR |
3319 | free_module(mod); |
3320 | wake_up_all(&module_wq); | |
3321 | return ret; | |
34e1169d KC |
3322 | } |
3323 | ||
3324 | static int may_init_module(void) | |
3325 | { | |
3326 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3327 | return -EPERM; | |
3328 | ||
3329 | return 0; | |
3330 | } | |
3331 | ||
a3535c7e RR |
3332 | /* |
3333 | * We try to place it in the list now to make sure it's unique before | |
3334 | * we dedicate too many resources. In particular, temporary percpu | |
3335 | * memory exhaustion. | |
3336 | */ | |
3337 | static int add_unformed_module(struct module *mod) | |
3338 | { | |
3339 | int err; | |
3340 | struct module *old; | |
3341 | ||
3342 | mod->state = MODULE_STATE_UNFORMED; | |
3343 | ||
3344 | again: | |
3345 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3346 | old = find_module_all(mod->name, strlen(mod->name), true); |
3347 | if (old != NULL) { | |
a3535c7e RR |
3348 | if (old->state == MODULE_STATE_COMING |
3349 | || old->state == MODULE_STATE_UNFORMED) { | |
3350 | /* Wait in case it fails to load. */ | |
3351 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3352 | err = wait_event_interruptible(module_wq, |
3353 | finished_loading(mod->name)); | |
a3535c7e RR |
3354 | if (err) |
3355 | goto out_unlocked; | |
3356 | goto again; | |
3357 | } | |
3358 | err = -EEXIST; | |
3359 | goto out; | |
3360 | } | |
4f666546 | 3361 | mod_update_bounds(mod); |
a3535c7e | 3362 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3363 | mod_tree_insert(mod); |
a3535c7e RR |
3364 | err = 0; |
3365 | ||
3366 | out: | |
3367 | mutex_unlock(&module_mutex); | |
3368 | out_unlocked: | |
3369 | return err; | |
3370 | } | |
3371 | ||
3372 | static int complete_formation(struct module *mod, struct load_info *info) | |
3373 | { | |
3374 | int err; | |
3375 | ||
3376 | mutex_lock(&module_mutex); | |
3377 | ||
3378 | /* Find duplicate symbols (must be called under lock). */ | |
3379 | err = verify_export_symbols(mod); | |
3380 | if (err < 0) | |
3381 | goto out; | |
3382 | ||
3383 | /* This relies on module_mutex for list integrity. */ | |
3384 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3385 | ||
20ef10c1 | 3386 | /* Set RO and NX regions */ |
85c898db RR |
3387 | module_enable_ro(mod); |
3388 | module_enable_nx(mod); | |
4982223e | 3389 | |
a3535c7e RR |
3390 | /* Mark state as coming so strong_try_module_get() ignores us, |
3391 | * but kallsyms etc. can see us. */ | |
3392 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3393 | mutex_unlock(&module_mutex); |
3394 | ||
7dcd182b | 3395 | ftrace_module_enable(mod); |
4982223e RR |
3396 | blocking_notifier_call_chain(&module_notify_list, |
3397 | MODULE_STATE_COMING, mod); | |
3398 | return 0; | |
a3535c7e RR |
3399 | |
3400 | out: | |
3401 | mutex_unlock(&module_mutex); | |
3402 | return err; | |
3403 | } | |
3404 | ||
ecc86170 LR |
3405 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3406 | void *arg) | |
54041d8a | 3407 | { |
f2411da7 LR |
3408 | struct module *mod = arg; |
3409 | int ret; | |
3410 | ||
3411 | if (strcmp(param, "async_probe") == 0) { | |
3412 | mod->async_probe_requested = true; | |
3413 | return 0; | |
3414 | } | |
3415 | ||
6da0b565 | 3416 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3417 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3418 | if (ret != 0) |
3419 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3420 | return 0; |
3421 | } | |
3422 | ||
d913188c RR |
3423 | /* Allocate and load the module: note that size of section 0 is always |
3424 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3425 | static int load_module(struct load_info *info, const char __user *uargs, |
3426 | int flags) | |
d913188c | 3427 | { |
a3535c7e | 3428 | struct module *mod; |
d913188c | 3429 | long err; |
51e158c1 | 3430 | char *after_dashes; |
d913188c | 3431 | |
34e1169d KC |
3432 | err = module_sig_check(info); |
3433 | if (err) | |
3434 | goto free_copy; | |
d913188c | 3435 | |
34e1169d | 3436 | err = elf_header_check(info); |
d913188c | 3437 | if (err) |
34e1169d | 3438 | goto free_copy; |
d913188c RR |
3439 | |
3440 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3441 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3442 | if (IS_ERR(mod)) { |
3443 | err = PTR_ERR(mod); | |
d913188c | 3444 | goto free_copy; |
1da177e4 | 3445 | } |
1da177e4 | 3446 | |
a3535c7e RR |
3447 | /* Reserve our place in the list. */ |
3448 | err = add_unformed_module(mod); | |
3449 | if (err) | |
1fb9341a | 3450 | goto free_module; |
1fb9341a | 3451 | |
106a4ee2 | 3452 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3453 | mod->sig_ok = info->sig_ok; |
64748a2c | 3454 | if (!mod->sig_ok) { |
bddb12b3 | 3455 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3456 | "and/or required key missing - tainting " |
bddb12b3 | 3457 | "kernel\n", mod->name); |
66cc69e3 | 3458 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3459 | } |
106a4ee2 RR |
3460 | #endif |
3461 | ||
8d8022e8 | 3462 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3463 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3464 | if (err) |
3465 | goto unlink_mod; | |
3466 | ||
49668688 | 3467 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3468 | err = module_unload_init(mod); |
3469 | if (err) | |
1fb9341a | 3470 | goto unlink_mod; |
1da177e4 | 3471 | |
cf2fde7b | 3472 | init_param_lock(mod); |
b51d23e4 | 3473 | |
22e268eb RR |
3474 | /* Now we've got everything in the final locations, we can |
3475 | * find optional sections. */ | |
eb3057df FH |
3476 | err = find_module_sections(mod, info); |
3477 | if (err) | |
3478 | goto free_unload; | |
9b37ccfc | 3479 | |
49668688 | 3480 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3481 | if (err) |
3482 | goto free_unload; | |
9841d61d | 3483 | |
c988d2b2 | 3484 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3485 | setup_modinfo(mod, info); |
c988d2b2 | 3486 | |
1da177e4 | 3487 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3488 | err = simplify_symbols(mod, info); |
1da177e4 | 3489 | if (err < 0) |
d913188c | 3490 | goto free_modinfo; |
1da177e4 | 3491 | |
34e1169d | 3492 | err = apply_relocations(mod, info); |
22e268eb | 3493 | if (err < 0) |
d913188c | 3494 | goto free_modinfo; |
1da177e4 | 3495 | |
34e1169d | 3496 | err = post_relocation(mod, info); |
1da177e4 | 3497 | if (err < 0) |
d913188c | 3498 | goto free_modinfo; |
1da177e4 | 3499 | |
22e268eb | 3500 | flush_module_icache(mod); |
378bac82 | 3501 | |
6526c534 RR |
3502 | /* Now copy in args */ |
3503 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3504 | if (IS_ERR(mod->args)) { | |
3505 | err = PTR_ERR(mod->args); | |
3506 | goto free_arch_cleanup; | |
3507 | } | |
8d3b33f6 | 3508 | |
34e1169d | 3509 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3510 | |
a949ae56 SRRH |
3511 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3512 | ftrace_module_init(mod); | |
3513 | ||
a3535c7e RR |
3514 | /* Finally it's fully formed, ready to start executing. */ |
3515 | err = complete_formation(mod, info); | |
3516 | if (err) | |
1fb9341a | 3517 | goto ddebug_cleanup; |
be593f4c | 3518 | |
51f3d0f4 | 3519 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3520 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3521 | -32768, 32767, mod, |
ecc86170 | 3522 | unknown_module_param_cb); |
51e158c1 RR |
3523 | if (IS_ERR(after_dashes)) { |
3524 | err = PTR_ERR(after_dashes); | |
1fb9341a | 3525 | goto bug_cleanup; |
51e158c1 RR |
3526 | } else if (after_dashes) { |
3527 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3528 | mod->name, after_dashes); | |
3529 | } | |
1da177e4 | 3530 | |
51f3d0f4 | 3531 | /* Link in to syfs. */ |
34e1169d | 3532 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3533 | if (err < 0) |
1fb9341a | 3534 | goto bug_cleanup; |
80a3d1bb | 3535 | |
48fd1188 | 3536 | /* Get rid of temporary copy. */ |
34e1169d | 3537 | free_copy(info); |
1da177e4 LT |
3538 | |
3539 | /* Done! */ | |
51f3d0f4 | 3540 | trace_module_load(mod); |
34e1169d KC |
3541 | |
3542 | return do_init_module(mod); | |
1da177e4 | 3543 | |
1fb9341a RR |
3544 | bug_cleanup: |
3545 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3546 | mutex_lock(&module_mutex); |
5336377d | 3547 | module_bug_cleanup(mod); |
ee61abb3 | 3548 | mutex_unlock(&module_mutex); |
ff7e0055 | 3549 | |
37815bf8 SR |
3550 | blocking_notifier_call_chain(&module_notify_list, |
3551 | MODULE_STATE_GOING, mod); | |
3552 | ||
ff7e0055 | 3553 | /* we can't deallocate the module until we clear memory protection */ |
85c898db RR |
3554 | module_disable_ro(mod); |
3555 | module_disable_nx(mod); | |
ff7e0055 | 3556 | |
a3535c7e | 3557 | ddebug_cleanup: |
1fb9341a | 3558 | dynamic_debug_remove(info->debug); |
e91defa2 | 3559 | synchronize_sched(); |
6526c534 RR |
3560 | kfree(mod->args); |
3561 | free_arch_cleanup: | |
1da177e4 | 3562 | module_arch_cleanup(mod); |
d913188c | 3563 | free_modinfo: |
a263f776 | 3564 | free_modinfo(mod); |
22e268eb | 3565 | free_unload: |
1da177e4 | 3566 | module_unload_free(mod); |
1fb9341a RR |
3567 | unlink_mod: |
3568 | mutex_lock(&module_mutex); | |
3569 | /* Unlink carefully: kallsyms could be walking list. */ | |
3570 | list_del_rcu(&mod->list); | |
758556bd | 3571 | mod_tree_remove(mod); |
1fb9341a | 3572 | wake_up_all(&module_wq); |
0be964be PZ |
3573 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
3574 | synchronize_sched(); | |
1fb9341a | 3575 | mutex_unlock(&module_mutex); |
d913188c | 3576 | free_module: |
049fb9bd SRRH |
3577 | /* |
3578 | * Ftrace needs to clean up what it initialized. | |
3579 | * This does nothing if ftrace_module_init() wasn't called, | |
3580 | * but it must be called outside of module_mutex. | |
3581 | */ | |
3582 | ftrace_release_mod(mod); | |
35a9393c | 3583 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3584 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3585 | |
34e1169d | 3586 | module_deallocate(mod, info); |
d913188c | 3587 | free_copy: |
34e1169d KC |
3588 | free_copy(info); |
3589 | return err; | |
b99b87f7 PO |
3590 | } |
3591 | ||
17da2bd9 HC |
3592 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3593 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3594 | { |
34e1169d KC |
3595 | int err; |
3596 | struct load_info info = { }; | |
1da177e4 | 3597 | |
34e1169d KC |
3598 | err = may_init_module(); |
3599 | if (err) | |
3600 | return err; | |
1da177e4 | 3601 | |
34e1169d KC |
3602 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3603 | umod, len, uargs); | |
1da177e4 | 3604 | |
34e1169d KC |
3605 | err = copy_module_from_user(umod, len, &info); |
3606 | if (err) | |
3607 | return err; | |
1da177e4 | 3608 | |
2f3238ae | 3609 | return load_module(&info, uargs, 0); |
34e1169d | 3610 | } |
94462ad3 | 3611 | |
2f3238ae | 3612 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d KC |
3613 | { |
3614 | int err; | |
3615 | struct load_info info = { }; | |
94462ad3 | 3616 | |
34e1169d KC |
3617 | err = may_init_module(); |
3618 | if (err) | |
3619 | return err; | |
1da177e4 | 3620 | |
2f3238ae | 3621 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3622 | |
2f3238ae RR |
3623 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3624 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3625 | return -EINVAL; | |
d6de2c80 | 3626 | |
34e1169d KC |
3627 | err = copy_module_from_fd(fd, &info); |
3628 | if (err) | |
3629 | return err; | |
1da177e4 | 3630 | |
2f3238ae | 3631 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3632 | } |
3633 | ||
3634 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3635 | { | |
3636 | return ((void *)addr >= start && (void *)addr < start + size); | |
3637 | } | |
3638 | ||
3639 | #ifdef CONFIG_KALLSYMS | |
3640 | /* | |
3641 | * This ignores the intensely annoying "mapping symbols" found | |
3642 | * in ARM ELF files: $a, $t and $d. | |
3643 | */ | |
3644 | static inline int is_arm_mapping_symbol(const char *str) | |
3645 | { | |
2e3a10a1 RK |
3646 | if (str[0] == '.' && str[1] == 'L') |
3647 | return true; | |
6c34f1f5 | 3648 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3649 | && (str[2] == '\0' || str[2] == '.'); |
3650 | } | |
3651 | ||
8244062e | 3652 | static const char *symname(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 3653 | { |
8244062e | 3654 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
3655 | } |
3656 | ||
1da177e4 LT |
3657 | static const char *get_ksymbol(struct module *mod, |
3658 | unsigned long addr, | |
3659 | unsigned long *size, | |
3660 | unsigned long *offset) | |
3661 | { | |
3662 | unsigned int i, best = 0; | |
3663 | unsigned long nextval; | |
8244062e | 3664 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
3665 | |
3666 | /* At worse, next value is at end of module */ | |
a06f6211 | 3667 | if (within_module_init(addr, mod)) |
7523e4dc | 3668 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 3669 | else |
7523e4dc | 3670 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 3671 | |
25985edc | 3672 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3673 | starts real symbols at 1). */ |
8244062e RR |
3674 | for (i = 1; i < kallsyms->num_symtab; i++) { |
3675 | if (kallsyms->symtab[i].st_shndx == SHN_UNDEF) | |
1da177e4 LT |
3676 | continue; |
3677 | ||
3678 | /* We ignore unnamed symbols: they're uninformative | |
3679 | * and inserted at a whim. */ | |
8244062e RR |
3680 | if (*symname(kallsyms, i) == '\0' |
3681 | || is_arm_mapping_symbol(symname(kallsyms, i))) | |
2e7bac53 RR |
3682 | continue; |
3683 | ||
8244062e RR |
3684 | if (kallsyms->symtab[i].st_value <= addr |
3685 | && kallsyms->symtab[i].st_value > kallsyms->symtab[best].st_value) | |
1da177e4 | 3686 | best = i; |
8244062e RR |
3687 | if (kallsyms->symtab[i].st_value > addr |
3688 | && kallsyms->symtab[i].st_value < nextval) | |
3689 | nextval = kallsyms->symtab[i].st_value; | |
1da177e4 LT |
3690 | } |
3691 | ||
3692 | if (!best) | |
3693 | return NULL; | |
3694 | ||
ffb45122 | 3695 | if (size) |
8244062e | 3696 | *size = nextval - kallsyms->symtab[best].st_value; |
ffb45122 | 3697 | if (offset) |
8244062e RR |
3698 | *offset = addr - kallsyms->symtab[best].st_value; |
3699 | return symname(kallsyms, best); | |
1da177e4 LT |
3700 | } |
3701 | ||
6dd06c9f RR |
3702 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3703 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3704 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3705 | unsigned long *size, |
3706 | unsigned long *offset, | |
3707 | char **modname, | |
3708 | char *namebuf) | |
1da177e4 | 3709 | { |
cb2a5205 | 3710 | const char *ret = NULL; |
b7df4d1b | 3711 | struct module *mod; |
1da177e4 | 3712 | |
cb2a5205 | 3713 | preempt_disable(); |
b7df4d1b PZ |
3714 | mod = __module_address(addr); |
3715 | if (mod) { | |
3716 | if (modname) | |
3717 | *modname = mod->name; | |
3718 | ret = get_ksymbol(mod, addr, size, offset); | |
1da177e4 | 3719 | } |
6dd06c9f RR |
3720 | /* Make a copy in here where it's safe */ |
3721 | if (ret) { | |
3722 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3723 | ret = namebuf; | |
3724 | } | |
cb2a5205 | 3725 | preempt_enable(); |
b7df4d1b | 3726 | |
92dfc9dc | 3727 | return ret; |
1da177e4 LT |
3728 | } |
3729 | ||
9d65cb4a AD |
3730 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3731 | { | |
3732 | struct module *mod; | |
3733 | ||
cb2a5205 | 3734 | preempt_disable(); |
d72b3751 | 3735 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3736 | if (mod->state == MODULE_STATE_UNFORMED) |
3737 | continue; | |
9b20a352 | 3738 | if (within_module(addr, mod)) { |
9d65cb4a AD |
3739 | const char *sym; |
3740 | ||
3741 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3742 | if (!sym) | |
3743 | goto out; | |
9281acea | 3744 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3745 | preempt_enable(); |
9d65cb4a AD |
3746 | return 0; |
3747 | } | |
3748 | } | |
3749 | out: | |
cb2a5205 | 3750 | preempt_enable(); |
9d65cb4a AD |
3751 | return -ERANGE; |
3752 | } | |
3753 | ||
a5c43dae AD |
3754 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3755 | unsigned long *offset, char *modname, char *name) | |
3756 | { | |
3757 | struct module *mod; | |
3758 | ||
cb2a5205 | 3759 | preempt_disable(); |
d72b3751 | 3760 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3761 | if (mod->state == MODULE_STATE_UNFORMED) |
3762 | continue; | |
9b20a352 | 3763 | if (within_module(addr, mod)) { |
a5c43dae AD |
3764 | const char *sym; |
3765 | ||
3766 | sym = get_ksymbol(mod, addr, size, offset); | |
3767 | if (!sym) | |
3768 | goto out; | |
3769 | if (modname) | |
9281acea | 3770 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3771 | if (name) |
9281acea | 3772 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3773 | preempt_enable(); |
a5c43dae AD |
3774 | return 0; |
3775 | } | |
3776 | } | |
3777 | out: | |
cb2a5205 | 3778 | preempt_enable(); |
a5c43dae AD |
3779 | return -ERANGE; |
3780 | } | |
3781 | ||
ea07890a AD |
3782 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3783 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3784 | { |
3785 | struct module *mod; | |
3786 | ||
cb2a5205 | 3787 | preempt_disable(); |
d72b3751 | 3788 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
3789 | struct mod_kallsyms *kallsyms; |
3790 | ||
0d21b0e3 RR |
3791 | if (mod->state == MODULE_STATE_UNFORMED) |
3792 | continue; | |
8244062e RR |
3793 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
3794 | if (symnum < kallsyms->num_symtab) { | |
3795 | *value = kallsyms->symtab[symnum].st_value; | |
3796 | *type = kallsyms->symtab[symnum].st_info; | |
3797 | strlcpy(name, symname(kallsyms, symnum), KSYM_NAME_LEN); | |
9281acea | 3798 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 3799 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3800 | preempt_enable(); |
ea07890a | 3801 | return 0; |
1da177e4 | 3802 | } |
8244062e | 3803 | symnum -= kallsyms->num_symtab; |
1da177e4 | 3804 | } |
cb2a5205 | 3805 | preempt_enable(); |
ea07890a | 3806 | return -ERANGE; |
1da177e4 LT |
3807 | } |
3808 | ||
3809 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3810 | { | |
3811 | unsigned int i; | |
8244062e | 3812 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 3813 | |
8244062e RR |
3814 | for (i = 0; i < kallsyms->num_symtab; i++) |
3815 | if (strcmp(name, symname(kallsyms, i)) == 0 && | |
3816 | kallsyms->symtab[i].st_info != 'U') | |
3817 | return kallsyms->symtab[i].st_value; | |
1da177e4 LT |
3818 | return 0; |
3819 | } | |
3820 | ||
3821 | /* Look for this name: can be of form module:name. */ | |
3822 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3823 | { | |
3824 | struct module *mod; | |
3825 | char *colon; | |
3826 | unsigned long ret = 0; | |
3827 | ||
3828 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3829 | preempt_disable(); |
1da177e4 | 3830 | if ((colon = strchr(name, ':')) != NULL) { |
4f6de4d5 | 3831 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 3832 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 3833 | } else { |
0d21b0e3 RR |
3834 | list_for_each_entry_rcu(mod, &modules, list) { |
3835 | if (mod->state == MODULE_STATE_UNFORMED) | |
3836 | continue; | |
1da177e4 LT |
3837 | if ((ret = mod_find_symname(mod, name)) != 0) |
3838 | break; | |
0d21b0e3 | 3839 | } |
1da177e4 | 3840 | } |
cb2a5205 | 3841 | preempt_enable(); |
1da177e4 LT |
3842 | return ret; |
3843 | } | |
75a66614 AK |
3844 | |
3845 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3846 | struct module *, unsigned long), | |
3847 | void *data) | |
3848 | { | |
3849 | struct module *mod; | |
3850 | unsigned int i; | |
3851 | int ret; | |
3852 | ||
0be964be PZ |
3853 | module_assert_mutex(); |
3854 | ||
75a66614 | 3855 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
3856 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
3857 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
3858 | ||
0d21b0e3 RR |
3859 | if (mod->state == MODULE_STATE_UNFORMED) |
3860 | continue; | |
8244062e RR |
3861 | for (i = 0; i < kallsyms->num_symtab; i++) { |
3862 | ret = fn(data, symname(kallsyms, i), | |
3863 | mod, kallsyms->symtab[i].st_value); | |
75a66614 AK |
3864 | if (ret != 0) |
3865 | return ret; | |
3866 | } | |
3867 | } | |
3868 | return 0; | |
3869 | } | |
1da177e4 LT |
3870 | #endif /* CONFIG_KALLSYMS */ |
3871 | ||
21aa9280 | 3872 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3873 | { |
3874 | int bx = 0; | |
3875 | ||
0d21b0e3 | 3876 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
3877 | if (mod->taints || |
3878 | mod->state == MODULE_STATE_GOING || | |
3879 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3880 | buf[bx++] = '('; |
cca3e707 | 3881 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
3882 | /* Show a - for module-is-being-unloaded */ |
3883 | if (mod->state == MODULE_STATE_GOING) | |
3884 | buf[bx++] = '-'; | |
3885 | /* Show a + for module-is-being-loaded */ | |
3886 | if (mod->state == MODULE_STATE_COMING) | |
3887 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3888 | buf[bx++] = ')'; |
3889 | } | |
3890 | buf[bx] = '\0'; | |
3891 | ||
3892 | return buf; | |
3893 | } | |
3894 | ||
3b5d5c6b AD |
3895 | #ifdef CONFIG_PROC_FS |
3896 | /* Called by the /proc file system to return a list of modules. */ | |
3897 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3898 | { | |
3899 | mutex_lock(&module_mutex); | |
3900 | return seq_list_start(&modules, *pos); | |
3901 | } | |
3902 | ||
3903 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3904 | { | |
3905 | return seq_list_next(p, &modules, pos); | |
3906 | } | |
3907 | ||
3908 | static void m_stop(struct seq_file *m, void *p) | |
3909 | { | |
3910 | mutex_unlock(&module_mutex); | |
3911 | } | |
3912 | ||
1da177e4 LT |
3913 | static int m_show(struct seq_file *m, void *p) |
3914 | { | |
3915 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3916 | char buf[8]; |
3917 | ||
0d21b0e3 RR |
3918 | /* We always ignore unformed modules. */ |
3919 | if (mod->state == MODULE_STATE_UNFORMED) | |
3920 | return 0; | |
3921 | ||
2f0f2a33 | 3922 | seq_printf(m, "%s %u", |
7523e4dc | 3923 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
3924 | print_unload_info(m, mod); |
3925 | ||
3926 | /* Informative for users. */ | |
3927 | seq_printf(m, " %s", | |
6da0b565 IA |
3928 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
3929 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
3930 | "Live"); |
3931 | /* Used by oprofile and other similar tools. */ | |
7523e4dc | 3932 | seq_printf(m, " 0x%pK", mod->core_layout.base); |
1da177e4 | 3933 | |
fa3ba2e8 FM |
3934 | /* Taints info */ |
3935 | if (mod->taints) | |
21aa9280 | 3936 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3937 | |
6da0b565 | 3938 | seq_puts(m, "\n"); |
1da177e4 LT |
3939 | return 0; |
3940 | } | |
3941 | ||
3942 | /* Format: modulename size refcount deps address | |
3943 | ||
3944 | Where refcount is a number or -, and deps is a comma-separated list | |
3945 | of depends or -. | |
3946 | */ | |
3b5d5c6b | 3947 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3948 | .start = m_start, |
3949 | .next = m_next, | |
3950 | .stop = m_stop, | |
3951 | .show = m_show | |
3952 | }; | |
3953 | ||
3b5d5c6b AD |
3954 | static int modules_open(struct inode *inode, struct file *file) |
3955 | { | |
3956 | return seq_open(file, &modules_op); | |
3957 | } | |
3958 | ||
3959 | static const struct file_operations proc_modules_operations = { | |
3960 | .open = modules_open, | |
3961 | .read = seq_read, | |
3962 | .llseek = seq_lseek, | |
3963 | .release = seq_release, | |
3964 | }; | |
3965 | ||
3966 | static int __init proc_modules_init(void) | |
3967 | { | |
3968 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3969 | return 0; | |
3970 | } | |
3971 | module_init(proc_modules_init); | |
3972 | #endif | |
3973 | ||
1da177e4 LT |
3974 | /* Given an address, look for it in the module exception tables. */ |
3975 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3976 | { | |
1da177e4 LT |
3977 | const struct exception_table_entry *e = NULL; |
3978 | struct module *mod; | |
3979 | ||
24da1cbf | 3980 | preempt_disable(); |
d72b3751 | 3981 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3982 | if (mod->state == MODULE_STATE_UNFORMED) |
3983 | continue; | |
1da177e4 LT |
3984 | if (mod->num_exentries == 0) |
3985 | continue; | |
22a8bdeb | 3986 | |
1da177e4 LT |
3987 | e = search_extable(mod->extable, |
3988 | mod->extable + mod->num_exentries - 1, | |
3989 | addr); | |
3990 | if (e) | |
3991 | break; | |
3992 | } | |
24da1cbf | 3993 | preempt_enable(); |
1da177e4 LT |
3994 | |
3995 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3996 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3997 | return e; |
3998 | } | |
3999 | ||
4d435f9d | 4000 | /* |
e610499e RR |
4001 | * is_module_address - is this address inside a module? |
4002 | * @addr: the address to check. | |
4003 | * | |
4004 | * See is_module_text_address() if you simply want to see if the address | |
4005 | * is code (not data). | |
4d435f9d | 4006 | */ |
e610499e | 4007 | bool is_module_address(unsigned long addr) |
4d435f9d | 4008 | { |
e610499e | 4009 | bool ret; |
4d435f9d | 4010 | |
24da1cbf | 4011 | preempt_disable(); |
e610499e | 4012 | ret = __module_address(addr) != NULL; |
24da1cbf | 4013 | preempt_enable(); |
4d435f9d | 4014 | |
e610499e | 4015 | return ret; |
4d435f9d IM |
4016 | } |
4017 | ||
e610499e RR |
4018 | /* |
4019 | * __module_address - get the module which contains an address. | |
4020 | * @addr: the address. | |
4021 | * | |
4022 | * Must be called with preempt disabled or module mutex held so that | |
4023 | * module doesn't get freed during this. | |
4024 | */ | |
714f83d5 | 4025 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4026 | { |
4027 | struct module *mod; | |
4028 | ||
3a642e99 RR |
4029 | if (addr < module_addr_min || addr > module_addr_max) |
4030 | return NULL; | |
4031 | ||
0be964be PZ |
4032 | module_assert_mutex_or_preempt(); |
4033 | ||
6c9692e2 | 4034 | mod = mod_find(addr); |
93c2e105 PZ |
4035 | if (mod) { |
4036 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4037 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4038 | mod = NULL; |
0d21b0e3 | 4039 | } |
93c2e105 | 4040 | return mod; |
1da177e4 | 4041 | } |
c6b37801 | 4042 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4043 | |
e610499e RR |
4044 | /* |
4045 | * is_module_text_address - is this address inside module code? | |
4046 | * @addr: the address to check. | |
4047 | * | |
4048 | * See is_module_address() if you simply want to see if the address is | |
4049 | * anywhere in a module. See kernel_text_address() for testing if an | |
4050 | * address corresponds to kernel or module code. | |
4051 | */ | |
4052 | bool is_module_text_address(unsigned long addr) | |
4053 | { | |
4054 | bool ret; | |
4055 | ||
4056 | preempt_disable(); | |
4057 | ret = __module_text_address(addr) != NULL; | |
4058 | preempt_enable(); | |
4059 | ||
4060 | return ret; | |
4061 | } | |
4062 | ||
4063 | /* | |
4064 | * __module_text_address - get the module whose code contains an address. | |
4065 | * @addr: the address. | |
4066 | * | |
4067 | * Must be called with preempt disabled or module mutex held so that | |
4068 | * module doesn't get freed during this. | |
4069 | */ | |
4070 | struct module *__module_text_address(unsigned long addr) | |
4071 | { | |
4072 | struct module *mod = __module_address(addr); | |
4073 | if (mod) { | |
4074 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4075 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4076 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4077 | mod = NULL; |
4078 | } | |
4079 | return mod; | |
4080 | } | |
c6b37801 | 4081 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4082 | |
1da177e4 LT |
4083 | /* Don't grab lock, we're oopsing. */ |
4084 | void print_modules(void) | |
4085 | { | |
4086 | struct module *mod; | |
2bc2d61a | 4087 | char buf[8]; |
1da177e4 | 4088 | |
b231125a | 4089 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4090 | /* Most callers should already have preempt disabled, but make sure */ |
4091 | preempt_disable(); | |
0d21b0e3 RR |
4092 | list_for_each_entry_rcu(mod, &modules, list) { |
4093 | if (mod->state == MODULE_STATE_UNFORMED) | |
4094 | continue; | |
27bba4d6 | 4095 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4096 | } |
d72b3751 | 4097 | preempt_enable(); |
e14af7ee | 4098 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4099 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4100 | pr_cont("\n"); | |
1da177e4 LT |
4101 | } |
4102 | ||
1da177e4 | 4103 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4104 | /* Generate the signature for all relevant module structures here. |
4105 | * If these change, we don't want to try to parse the module. */ | |
4106 | void module_layout(struct module *mod, | |
4107 | struct modversion_info *ver, | |
4108 | struct kernel_param *kp, | |
4109 | struct kernel_symbol *ks, | |
65498646 | 4110 | struct tracepoint * const *tp) |
8c8ef42a RR |
4111 | { |
4112 | } | |
4113 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4114 | #endif |