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Commit | Line | Data |
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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> |
7c0f6ba6 | 49 | #include <linux/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> |
7e545d6e | 56 | #include <linux/livepatch.h> |
22a9d645 | 57 | #include <linux/async.h> |
fbf59bc9 | 58 | #include <linux/percpu.h> |
4f2294b6 | 59 | #include <linux/kmemleak.h> |
bf5438fc | 60 | #include <linux/jump_label.h> |
84e1c6bb | 61 | #include <linux/pfn.h> |
403ed278 | 62 | #include <linux/bsearch.h> |
9d5059c9 | 63 | #include <linux/dynamic_debug.h> |
2f3238ae | 64 | #include <uapi/linux/module.h> |
106a4ee2 | 65 | #include "module-internal.h" |
1da177e4 | 66 | |
7ead8b83 LZ |
67 | #define CREATE_TRACE_POINTS |
68 | #include <trace/events/module.h> | |
69 | ||
1da177e4 LT |
70 | #ifndef ARCH_SHF_SMALL |
71 | #define ARCH_SHF_SMALL 0 | |
72 | #endif | |
73 | ||
84e1c6bb MC |
74 | /* |
75 | * Modules' sections will be aligned on page boundaries | |
76 | * to ensure complete separation of code and data, but | |
77 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y | |
78 | */ | |
79 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
80 | # define debug_align(X) ALIGN(X, PAGE_SIZE) | |
81 | #else | |
82 | # define debug_align(X) (X) | |
83 | #endif | |
84 | ||
1da177e4 LT |
85 | /* If this is set, the section belongs in the init part of the module */ |
86 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
87 | ||
75676500 RR |
88 | /* |
89 | * Mutex protects: | |
90 | * 1) List of modules (also safely readable with preempt_disable), | |
91 | * 2) module_use links, | |
92 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 93 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
94 | DEFINE_MUTEX(module_mutex); |
95 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 96 | static LIST_HEAD(modules); |
67fc4e0c | 97 | |
6c9692e2 | 98 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 99 | |
93c2e105 PZ |
100 | /* |
101 | * Use a latched RB-tree for __module_address(); this allows us to use | |
102 | * RCU-sched lookups of the address from any context. | |
103 | * | |
6c9692e2 PZ |
104 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
105 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
106 | * NMI context. | |
93c2e105 PZ |
107 | */ |
108 | ||
109 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 110 | { |
7523e4dc | 111 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 112 | |
7523e4dc | 113 | return (unsigned long)layout->base; |
93c2e105 PZ |
114 | } |
115 | ||
116 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
117 | { | |
7523e4dc | 118 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 119 | |
7523e4dc | 120 | return (unsigned long)layout->size; |
93c2e105 PZ |
121 | } |
122 | ||
123 | static __always_inline bool | |
124 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
125 | { | |
126 | return __mod_tree_val(a) < __mod_tree_val(b); | |
127 | } | |
128 | ||
129 | static __always_inline int | |
130 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
131 | { | |
132 | unsigned long val = (unsigned long)key; | |
133 | unsigned long start, end; | |
134 | ||
135 | start = __mod_tree_val(n); | |
136 | if (val < start) | |
137 | return -1; | |
138 | ||
139 | end = start + __mod_tree_size(n); | |
140 | if (val >= end) | |
141 | return 1; | |
106a4ee2 | 142 | |
106a4ee2 RR |
143 | return 0; |
144 | } | |
145 | ||
93c2e105 PZ |
146 | static const struct latch_tree_ops mod_tree_ops = { |
147 | .less = mod_tree_less, | |
148 | .comp = mod_tree_comp, | |
149 | }; | |
150 | ||
4f666546 PZ |
151 | static struct mod_tree_root { |
152 | struct latch_tree_root root; | |
153 | unsigned long addr_min; | |
154 | unsigned long addr_max; | |
155 | } mod_tree __cacheline_aligned = { | |
156 | .addr_min = -1UL, | |
106a4ee2 | 157 | }; |
106a4ee2 | 158 | |
4f666546 PZ |
159 | #define module_addr_min mod_tree.addr_min |
160 | #define module_addr_max mod_tree.addr_max | |
161 | ||
162 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
163 | { | |
164 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
165 | } | |
166 | ||
167 | static void __mod_tree_remove(struct mod_tree_node *node) | |
168 | { | |
169 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
170 | } | |
93c2e105 PZ |
171 | |
172 | /* | |
173 | * These modifications: insert, remove_init and remove; are serialized by the | |
174 | * module_mutex. | |
175 | */ | |
176 | static void mod_tree_insert(struct module *mod) | |
177 | { | |
7523e4dc RR |
178 | mod->core_layout.mtn.mod = mod; |
179 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 180 | |
7523e4dc RR |
181 | __mod_tree_insert(&mod->core_layout.mtn); |
182 | if (mod->init_layout.size) | |
183 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
184 | } |
185 | ||
186 | static void mod_tree_remove_init(struct module *mod) | |
187 | { | |
7523e4dc RR |
188 | if (mod->init_layout.size) |
189 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
190 | } |
191 | ||
192 | static void mod_tree_remove(struct module *mod) | |
193 | { | |
7523e4dc | 194 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
195 | mod_tree_remove_init(mod); |
196 | } | |
197 | ||
6c9692e2 | 198 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
199 | { |
200 | struct latch_tree_node *ltn; | |
201 | ||
4f666546 | 202 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
203 | if (!ltn) |
204 | return NULL; | |
205 | ||
206 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
207 | } | |
208 | ||
6c9692e2 PZ |
209 | #else /* MODULES_TREE_LOOKUP */ |
210 | ||
4f666546 PZ |
211 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
212 | ||
6c9692e2 PZ |
213 | static void mod_tree_insert(struct module *mod) { } |
214 | static void mod_tree_remove_init(struct module *mod) { } | |
215 | static void mod_tree_remove(struct module *mod) { } | |
216 | ||
217 | static struct module *mod_find(unsigned long addr) | |
218 | { | |
219 | struct module *mod; | |
220 | ||
221 | list_for_each_entry_rcu(mod, &modules, list) { | |
222 | if (within_module(addr, mod)) | |
223 | return mod; | |
224 | } | |
225 | ||
226 | return NULL; | |
227 | } | |
228 | ||
229 | #endif /* MODULES_TREE_LOOKUP */ | |
230 | ||
4f666546 PZ |
231 | /* |
232 | * Bounds of module text, for speeding up __module_address. | |
233 | * Protected by module_mutex. | |
234 | */ | |
235 | static void __mod_update_bounds(void *base, unsigned int size) | |
236 | { | |
237 | unsigned long min = (unsigned long)base; | |
238 | unsigned long max = min + size; | |
239 | ||
240 | if (min < module_addr_min) | |
241 | module_addr_min = min; | |
242 | if (max > module_addr_max) | |
243 | module_addr_max = max; | |
244 | } | |
245 | ||
246 | static void mod_update_bounds(struct module *mod) | |
247 | { | |
7523e4dc RR |
248 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
249 | if (mod->init_layout.size) | |
250 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
251 | } |
252 | ||
67fc4e0c JW |
253 | #ifdef CONFIG_KGDB_KDB |
254 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
255 | #endif /* CONFIG_KGDB_KDB */ | |
256 | ||
0be964be PZ |
257 | static void module_assert_mutex(void) |
258 | { | |
259 | lockdep_assert_held(&module_mutex); | |
260 | } | |
261 | ||
262 | static void module_assert_mutex_or_preempt(void) | |
263 | { | |
264 | #ifdef CONFIG_LOCKDEP | |
265 | if (unlikely(!debug_locks)) | |
266 | return; | |
267 | ||
9502514f | 268 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
269 | !lockdep_is_held(&module_mutex)); |
270 | #endif | |
271 | } | |
272 | ||
6727bb9c LR |
273 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
274 | #ifndef CONFIG_MODULE_SIG_FORCE | |
106a4ee2 RR |
275 | module_param(sig_enforce, bool_enable_only, 0644); |
276 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
1da177e4 | 277 | |
19e4529e SR |
278 | /* Block module loading/unloading? */ |
279 | int modules_disabled = 0; | |
02608bef | 280 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 281 | |
c9a3ba55 RR |
282 | /* Waiting for a module to finish initializing? */ |
283 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
284 | ||
e041c683 | 285 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 286 | |
6da0b565 | 287 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 288 | { |
e041c683 | 289 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
290 | } |
291 | EXPORT_SYMBOL(register_module_notifier); | |
292 | ||
6da0b565 | 293 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 294 | { |
e041c683 | 295 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
296 | } |
297 | EXPORT_SYMBOL(unregister_module_notifier); | |
298 | ||
eded41c1 RR |
299 | struct load_info { |
300 | Elf_Ehdr *hdr; | |
301 | unsigned long len; | |
302 | Elf_Shdr *sechdrs; | |
6526c534 | 303 | char *secstrings, *strtab; |
d913188c | 304 | unsigned long symoffs, stroffs; |
811d66a0 RR |
305 | struct _ddebug *debug; |
306 | unsigned int num_debug; | |
106a4ee2 | 307 | bool sig_ok; |
8244062e RR |
308 | #ifdef CONFIG_KALLSYMS |
309 | unsigned long mod_kallsyms_init_off; | |
310 | #endif | |
eded41c1 RR |
311 | struct { |
312 | unsigned int sym, str, mod, vers, info, pcpu; | |
313 | } index; | |
314 | }; | |
315 | ||
71d9f507 MB |
316 | /* |
317 | * We require a truly strong try_module_get(): 0 means success. | |
318 | * Otherwise an error is returned due to ongoing or failed | |
319 | * initialization etc. | |
320 | */ | |
1da177e4 LT |
321 | static inline int strong_try_module_get(struct module *mod) |
322 | { | |
0d21b0e3 | 323 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 324 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
325 | return -EBUSY; |
326 | if (try_module_get(mod)) | |
1da177e4 | 327 | return 0; |
c9a3ba55 RR |
328 | else |
329 | return -ENOENT; | |
1da177e4 LT |
330 | } |
331 | ||
373d4d09 RR |
332 | static inline void add_taint_module(struct module *mod, unsigned flag, |
333 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 334 | { |
373d4d09 | 335 | add_taint(flag, lockdep_ok); |
7fd8329b | 336 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
337 | } |
338 | ||
02a3e59a RD |
339 | /* |
340 | * A thread that wants to hold a reference to a module only while it | |
341 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 342 | */ |
bf262dce | 343 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
344 | { |
345 | module_put(mod); | |
346 | do_exit(code); | |
347 | } | |
348 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 349 | |
1da177e4 | 350 | /* Find a module section: 0 means not found. */ |
49668688 | 351 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
352 | { |
353 | unsigned int i; | |
354 | ||
49668688 RR |
355 | for (i = 1; i < info->hdr->e_shnum; i++) { |
356 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 357 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
358 | if ((shdr->sh_flags & SHF_ALLOC) |
359 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 360 | return i; |
49668688 | 361 | } |
1da177e4 LT |
362 | return 0; |
363 | } | |
364 | ||
5e458cc0 | 365 | /* Find a module section, or NULL. */ |
49668688 | 366 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
367 | { |
368 | /* Section 0 has sh_addr 0. */ | |
49668688 | 369 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
370 | } |
371 | ||
372 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 373 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
374 | const char *name, |
375 | size_t object_size, | |
376 | unsigned int *num) | |
377 | { | |
49668688 | 378 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
379 | |
380 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
381 | *num = info->sechdrs[sec].sh_size / object_size; |
382 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
383 | } |
384 | ||
1da177e4 LT |
385 | /* Provided by the linker */ |
386 | extern const struct kernel_symbol __start___ksymtab[]; | |
387 | extern const struct kernel_symbol __stop___ksymtab[]; | |
388 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
389 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
390 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
391 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
392 | extern const s32 __start___kcrctab[]; |
393 | extern const s32 __start___kcrctab_gpl[]; | |
394 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
395 | #ifdef CONFIG_UNUSED_SYMBOLS |
396 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
397 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
398 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
399 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
400 | extern const s32 __start___kcrctab_unused[]; |
401 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 402 | #endif |
1da177e4 LT |
403 | |
404 | #ifndef CONFIG_MODVERSIONS | |
405 | #define symversion(base, idx) NULL | |
406 | #else | |
f83ca9fe | 407 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
408 | #endif |
409 | ||
dafd0940 RR |
410 | static bool each_symbol_in_section(const struct symsearch *arr, |
411 | unsigned int arrsize, | |
412 | struct module *owner, | |
413 | bool (*fn)(const struct symsearch *syms, | |
414 | struct module *owner, | |
de4d8d53 | 415 | void *data), |
dafd0940 | 416 | void *data) |
ad9546c9 | 417 | { |
de4d8d53 | 418 | unsigned int j; |
ad9546c9 | 419 | |
dafd0940 | 420 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
421 | if (fn(&arr[j], owner, data)) |
422 | return true; | |
f71d20e9 | 423 | } |
dafd0940 RR |
424 | |
425 | return false; | |
ad9546c9 RR |
426 | } |
427 | ||
dafd0940 | 428 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
429 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
430 | struct module *owner, | |
431 | void *data), | |
432 | void *data) | |
ad9546c9 RR |
433 | { |
434 | struct module *mod; | |
44032e63 | 435 | static const struct symsearch arr[] = { |
ad9546c9 | 436 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 437 | NOT_GPL_ONLY, false }, |
ad9546c9 | 438 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
439 | __start___kcrctab_gpl, |
440 | GPL_ONLY, false }, | |
ad9546c9 | 441 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
442 | __start___kcrctab_gpl_future, |
443 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 444 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 445 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
446 | __start___kcrctab_unused, |
447 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 448 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
449 | __start___kcrctab_unused_gpl, |
450 | GPL_ONLY, true }, | |
f7f5b675 | 451 | #endif |
ad9546c9 | 452 | }; |
f71d20e9 | 453 | |
0be964be PZ |
454 | module_assert_mutex_or_preempt(); |
455 | ||
dafd0940 RR |
456 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
457 | return true; | |
f71d20e9 | 458 | |
d72b3751 | 459 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
460 | struct symsearch arr[] = { |
461 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 462 | NOT_GPL_ONLY, false }, |
ad9546c9 | 463 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
464 | mod->gpl_crcs, |
465 | GPL_ONLY, false }, | |
ad9546c9 RR |
466 | { mod->gpl_future_syms, |
467 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
468 | mod->gpl_future_crcs, |
469 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 470 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
471 | { mod->unused_syms, |
472 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
473 | mod->unused_crcs, |
474 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
475 | { mod->unused_gpl_syms, |
476 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
477 | mod->unused_gpl_crcs, |
478 | GPL_ONLY, true }, | |
f7f5b675 | 479 | #endif |
ad9546c9 RR |
480 | }; |
481 | ||
0d21b0e3 RR |
482 | if (mod->state == MODULE_STATE_UNFORMED) |
483 | continue; | |
484 | ||
dafd0940 RR |
485 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
486 | return true; | |
487 | } | |
488 | return false; | |
489 | } | |
de4d8d53 | 490 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
491 | |
492 | struct find_symbol_arg { | |
493 | /* Input */ | |
494 | const char *name; | |
495 | bool gplok; | |
496 | bool warn; | |
497 | ||
498 | /* Output */ | |
499 | struct module *owner; | |
71810db2 | 500 | const s32 *crc; |
414fd31b | 501 | const struct kernel_symbol *sym; |
dafd0940 RR |
502 | }; |
503 | ||
de4d8d53 RR |
504 | static bool check_symbol(const struct symsearch *syms, |
505 | struct module *owner, | |
506 | unsigned int symnum, void *data) | |
dafd0940 RR |
507 | { |
508 | struct find_symbol_arg *fsa = data; | |
509 | ||
dafd0940 RR |
510 | if (!fsa->gplok) { |
511 | if (syms->licence == GPL_ONLY) | |
512 | return false; | |
513 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
514 | pr_warn("Symbol %s is being used by a non-GPL module, " |
515 | "which will not be allowed in the future\n", | |
516 | fsa->name); | |
9f28bb7e | 517 | } |
1da177e4 | 518 | } |
ad9546c9 | 519 | |
f7f5b675 | 520 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 521 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
522 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
523 | "using it.\n", fsa->name); | |
524 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
525 | pr_warn("Please evaluate if this is the right api to use and " |
526 | "if it really is, submit a report to the linux kernel " | |
527 | "mailing list together with submitting your code for " | |
bddb12b3 | 528 | "inclusion.\n"); |
dafd0940 | 529 | } |
f7f5b675 | 530 | #endif |
dafd0940 RR |
531 | |
532 | fsa->owner = owner; | |
533 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 534 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
535 | return true; |
536 | } | |
537 | ||
403ed278 AIB |
538 | static int cmp_name(const void *va, const void *vb) |
539 | { | |
540 | const char *a; | |
541 | const struct kernel_symbol *b; | |
542 | a = va; b = vb; | |
543 | return strcmp(a, b->name); | |
544 | } | |
545 | ||
de4d8d53 RR |
546 | static bool find_symbol_in_section(const struct symsearch *syms, |
547 | struct module *owner, | |
548 | void *data) | |
549 | { | |
550 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
551 | struct kernel_symbol *sym; |
552 | ||
553 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
554 | sizeof(struct kernel_symbol), cmp_name); | |
555 | ||
556 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
557 | return true; | |
de4d8d53 | 558 | |
de4d8d53 RR |
559 | return false; |
560 | } | |
561 | ||
414fd31b | 562 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 563 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
564 | const struct kernel_symbol *find_symbol(const char *name, |
565 | struct module **owner, | |
71810db2 | 566 | const s32 **crc, |
c6b37801 TA |
567 | bool gplok, |
568 | bool warn) | |
dafd0940 RR |
569 | { |
570 | struct find_symbol_arg fsa; | |
571 | ||
572 | fsa.name = name; | |
573 | fsa.gplok = gplok; | |
574 | fsa.warn = warn; | |
575 | ||
de4d8d53 | 576 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
577 | if (owner) |
578 | *owner = fsa.owner; | |
579 | if (crc) | |
580 | *crc = fsa.crc; | |
414fd31b | 581 | return fsa.sym; |
dafd0940 RR |
582 | } |
583 | ||
5e124169 | 584 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 585 | return NULL; |
1da177e4 | 586 | } |
c6b37801 | 587 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 588 | |
fe0d34d2 RR |
589 | /* |
590 | * Search for module by name: must hold module_mutex (or preempt disabled | |
591 | * for read-only access). | |
592 | */ | |
4f6de4d5 | 593 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 594 | bool even_unformed) |
1da177e4 LT |
595 | { |
596 | struct module *mod; | |
597 | ||
fe0d34d2 | 598 | module_assert_mutex_or_preempt(); |
0be964be | 599 | |
1da177e4 | 600 | list_for_each_entry(mod, &modules, list) { |
0d21b0e3 RR |
601 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
602 | continue; | |
4f6de4d5 | 603 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
604 | return mod; |
605 | } | |
606 | return NULL; | |
607 | } | |
0d21b0e3 RR |
608 | |
609 | struct module *find_module(const char *name) | |
610 | { | |
fe0d34d2 | 611 | module_assert_mutex(); |
4f6de4d5 | 612 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 613 | } |
c6b37801 | 614 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
615 | |
616 | #ifdef CONFIG_SMP | |
fbf59bc9 | 617 | |
259354de | 618 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 619 | { |
259354de TH |
620 | return mod->percpu; |
621 | } | |
fbf59bc9 | 622 | |
9eb76d77 | 623 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 624 | { |
9eb76d77 RR |
625 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
626 | unsigned long align = pcpusec->sh_addralign; | |
627 | ||
628 | if (!pcpusec->sh_size) | |
629 | return 0; | |
630 | ||
fbf59bc9 | 631 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
632 | pr_warn("%s: per-cpu alignment %li > %li\n", |
633 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
634 | align = PAGE_SIZE; |
635 | } | |
636 | ||
9eb76d77 | 637 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 638 | if (!mod->percpu) { |
bddb12b3 AM |
639 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
640 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
641 | return -ENOMEM; |
642 | } | |
9eb76d77 | 643 | mod->percpu_size = pcpusec->sh_size; |
259354de | 644 | return 0; |
fbf59bc9 TH |
645 | } |
646 | ||
259354de | 647 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 648 | { |
259354de | 649 | free_percpu(mod->percpu); |
fbf59bc9 TH |
650 | } |
651 | ||
49668688 | 652 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 653 | { |
49668688 | 654 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
655 | } |
656 | ||
259354de TH |
657 | static void percpu_modcopy(struct module *mod, |
658 | const void *from, unsigned long size) | |
6b588c18 TH |
659 | { |
660 | int cpu; | |
661 | ||
662 | for_each_possible_cpu(cpu) | |
259354de | 663 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
664 | } |
665 | ||
10fad5e4 TH |
666 | /** |
667 | * is_module_percpu_address - test whether address is from module static percpu | |
668 | * @addr: address to test | |
669 | * | |
670 | * Test whether @addr belongs to module static percpu area. | |
671 | * | |
672 | * RETURNS: | |
673 | * %true if @addr is from module static percpu area | |
674 | */ | |
675 | bool is_module_percpu_address(unsigned long addr) | |
676 | { | |
677 | struct module *mod; | |
678 | unsigned int cpu; | |
679 | ||
680 | preempt_disable(); | |
681 | ||
682 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
683 | if (mod->state == MODULE_STATE_UNFORMED) |
684 | continue; | |
10fad5e4 TH |
685 | if (!mod->percpu_size) |
686 | continue; | |
687 | for_each_possible_cpu(cpu) { | |
688 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
689 | ||
690 | if ((void *)addr >= start && | |
691 | (void *)addr < start + mod->percpu_size) { | |
692 | preempt_enable(); | |
693 | return true; | |
694 | } | |
695 | } | |
696 | } | |
697 | ||
698 | preempt_enable(); | |
699 | return false; | |
6b588c18 TH |
700 | } |
701 | ||
1da177e4 | 702 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 703 | |
259354de | 704 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
705 | { |
706 | return NULL; | |
707 | } | |
9eb76d77 | 708 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 709 | { |
9eb76d77 RR |
710 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
711 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
712 | return -ENOMEM; | |
713 | return 0; | |
259354de TH |
714 | } |
715 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 716 | { |
1da177e4 | 717 | } |
49668688 | 718 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
719 | { |
720 | return 0; | |
721 | } | |
259354de TH |
722 | static inline void percpu_modcopy(struct module *mod, |
723 | const void *from, unsigned long size) | |
1da177e4 LT |
724 | { |
725 | /* pcpusec should be 0, and size of that section should be 0. */ | |
726 | BUG_ON(size != 0); | |
727 | } | |
10fad5e4 TH |
728 | bool is_module_percpu_address(unsigned long addr) |
729 | { | |
730 | return false; | |
731 | } | |
6b588c18 | 732 | |
1da177e4 LT |
733 | #endif /* CONFIG_SMP */ |
734 | ||
c988d2b2 MD |
735 | #define MODINFO_ATTR(field) \ |
736 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
737 | { \ | |
738 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
739 | } \ | |
740 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 741 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 742 | { \ |
cc56ded3 | 743 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
744 | } \ |
745 | static int modinfo_##field##_exists(struct module *mod) \ | |
746 | { \ | |
747 | return mod->field != NULL; \ | |
748 | } \ | |
749 | static void free_modinfo_##field(struct module *mod) \ | |
750 | { \ | |
22a8bdeb DW |
751 | kfree(mod->field); \ |
752 | mod->field = NULL; \ | |
c988d2b2 MD |
753 | } \ |
754 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 755 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
756 | .show = show_modinfo_##field, \ |
757 | .setup = setup_modinfo_##field, \ | |
758 | .test = modinfo_##field##_exists, \ | |
759 | .free = free_modinfo_##field, \ | |
760 | }; | |
761 | ||
762 | MODINFO_ATTR(version); | |
763 | MODINFO_ATTR(srcversion); | |
764 | ||
e14af7ee AV |
765 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
766 | ||
03e88ae1 | 767 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
768 | |
769 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
770 | ||
e513cc1c MH |
771 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
772 | #define MODULE_REF_BASE 1 | |
773 | ||
1da177e4 | 774 | /* Init the unload section of the module. */ |
9f85a4bb | 775 | static int module_unload_init(struct module *mod) |
1da177e4 | 776 | { |
e513cc1c MH |
777 | /* |
778 | * Initialize reference counter to MODULE_REF_BASE. | |
779 | * refcnt == 0 means module is going. | |
780 | */ | |
781 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 782 | |
2c02dfe7 LT |
783 | INIT_LIST_HEAD(&mod->source_list); |
784 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 785 | |
1da177e4 | 786 | /* Hold reference count during initialization. */ |
e513cc1c | 787 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
788 | |
789 | return 0; | |
1da177e4 LT |
790 | } |
791 | ||
1da177e4 LT |
792 | /* Does a already use b? */ |
793 | static int already_uses(struct module *a, struct module *b) | |
794 | { | |
795 | struct module_use *use; | |
796 | ||
2c02dfe7 LT |
797 | list_for_each_entry(use, &b->source_list, source_list) { |
798 | if (use->source == a) { | |
5e124169 | 799 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
800 | return 1; |
801 | } | |
802 | } | |
5e124169 | 803 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
804 | return 0; |
805 | } | |
806 | ||
2c02dfe7 LT |
807 | /* |
808 | * Module a uses b | |
809 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
810 | * - the module_use is added to the list of 'b' sources (so | |
811 | * 'b' can walk the list to see who sourced them), and of 'a' | |
812 | * targets (so 'a' can see what modules it targets). | |
813 | */ | |
814 | static int add_module_usage(struct module *a, struct module *b) | |
815 | { | |
2c02dfe7 LT |
816 | struct module_use *use; |
817 | ||
5e124169 | 818 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
819 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
820 | if (!use) { | |
bddb12b3 | 821 | pr_warn("%s: out of memory loading\n", a->name); |
2c02dfe7 LT |
822 | return -ENOMEM; |
823 | } | |
824 | ||
825 | use->source = a; | |
826 | use->target = b; | |
827 | list_add(&use->source_list, &b->source_list); | |
828 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
829 | return 0; |
830 | } | |
831 | ||
75676500 | 832 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 833 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 834 | { |
c8e21ced | 835 | int err; |
270a6c4c | 836 | |
9bea7f23 | 837 | if (b == NULL || already_uses(a, b)) |
218ce735 | 838 | return 0; |
218ce735 | 839 | |
9bea7f23 RR |
840 | /* If module isn't available, we fail. */ |
841 | err = strong_try_module_get(b); | |
c9a3ba55 | 842 | if (err) |
9bea7f23 | 843 | return err; |
1da177e4 | 844 | |
2c02dfe7 LT |
845 | err = add_module_usage(a, b); |
846 | if (err) { | |
1da177e4 | 847 | module_put(b); |
9bea7f23 | 848 | return err; |
1da177e4 | 849 | } |
9bea7f23 | 850 | return 0; |
1da177e4 | 851 | } |
9bea7f23 | 852 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
853 | |
854 | /* Clear the unload stuff of the module. */ | |
855 | static void module_unload_free(struct module *mod) | |
856 | { | |
2c02dfe7 | 857 | struct module_use *use, *tmp; |
1da177e4 | 858 | |
75676500 | 859 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
860 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
861 | struct module *i = use->target; | |
5e124169 | 862 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
863 | module_put(i); |
864 | list_del(&use->source_list); | |
865 | list_del(&use->target_list); | |
866 | kfree(use); | |
1da177e4 | 867 | } |
75676500 | 868 | mutex_unlock(&module_mutex); |
1da177e4 LT |
869 | } |
870 | ||
871 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 872 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
873 | { |
874 | int ret = (flags & O_TRUNC); | |
875 | if (ret) | |
373d4d09 | 876 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
877 | return ret; |
878 | } | |
879 | #else | |
fb169793 | 880 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
881 | { |
882 | return 0; | |
883 | } | |
884 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
885 | ||
e513cc1c MH |
886 | /* Try to release refcount of module, 0 means success. */ |
887 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 888 | { |
e513cc1c | 889 | int ret; |
1da177e4 | 890 | |
e513cc1c MH |
891 | /* Try to decrement refcnt which we set at loading */ |
892 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
893 | BUG_ON(ret < 0); | |
894 | if (ret) | |
895 | /* Someone can put this right now, recover with checking */ | |
896 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 897 | |
e513cc1c MH |
898 | return ret; |
899 | } | |
1da177e4 | 900 | |
e513cc1c MH |
901 | static int try_stop_module(struct module *mod, int flags, int *forced) |
902 | { | |
da39ba5e | 903 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
904 | if (try_release_module_ref(mod) != 0) { |
905 | *forced = try_force_unload(flags); | |
906 | if (!(*forced)) | |
1da177e4 LT |
907 | return -EWOULDBLOCK; |
908 | } | |
909 | ||
910 | /* Mark it as dying. */ | |
e513cc1c | 911 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 912 | |
e513cc1c | 913 | return 0; |
1da177e4 LT |
914 | } |
915 | ||
d5db139a RR |
916 | /** |
917 | * module_refcount - return the refcount or -1 if unloading | |
918 | * | |
919 | * @mod: the module we're checking | |
920 | * | |
921 | * Returns: | |
922 | * -1 if the module is in the process of unloading | |
923 | * otherwise the number of references in the kernel to the module | |
924 | */ | |
925 | int module_refcount(struct module *mod) | |
1da177e4 | 926 | { |
d5db139a | 927 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
928 | } |
929 | EXPORT_SYMBOL(module_refcount); | |
930 | ||
931 | /* This exists whether we can unload or not */ | |
932 | static void free_module(struct module *mod); | |
933 | ||
17da2bd9 HC |
934 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
935 | unsigned int, flags) | |
1da177e4 LT |
936 | { |
937 | struct module *mod; | |
dfff0a06 | 938 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
939 | int ret, forced = 0; |
940 | ||
3d43321b | 941 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
942 | return -EPERM; |
943 | ||
944 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
945 | return -EFAULT; | |
946 | name[MODULE_NAME_LEN-1] = '\0'; | |
947 | ||
3fc1f1e2 TH |
948 | if (mutex_lock_interruptible(&module_mutex) != 0) |
949 | return -EINTR; | |
1da177e4 LT |
950 | |
951 | mod = find_module(name); | |
952 | if (!mod) { | |
953 | ret = -ENOENT; | |
954 | goto out; | |
955 | } | |
956 | ||
2c02dfe7 | 957 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
958 | /* Other modules depend on us: get rid of them first. */ |
959 | ret = -EWOULDBLOCK; | |
960 | goto out; | |
961 | } | |
962 | ||
963 | /* Doing init or already dying? */ | |
964 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 965 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 966 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
967 | ret = -EBUSY; |
968 | goto out; | |
969 | } | |
970 | ||
971 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 972 | if (mod->init && !mod->exit) { |
fb169793 | 973 | forced = try_force_unload(flags); |
1da177e4 LT |
974 | if (!forced) { |
975 | /* This module can't be removed */ | |
976 | ret = -EBUSY; | |
977 | goto out; | |
978 | } | |
979 | } | |
980 | ||
1da177e4 LT |
981 | /* Stop the machine so refcounts can't move and disable module. */ |
982 | ret = try_stop_module(mod, flags, &forced); | |
983 | if (ret != 0) | |
984 | goto out; | |
985 | ||
df4b565e | 986 | mutex_unlock(&module_mutex); |
25985edc | 987 | /* Final destruction now no one is using it. */ |
df4b565e | 988 | if (mod->exit != NULL) |
1da177e4 | 989 | mod->exit(); |
df4b565e PO |
990 | blocking_notifier_call_chain(&module_notify_list, |
991 | MODULE_STATE_GOING, mod); | |
7e545d6e | 992 | klp_module_going(mod); |
7dcd182b JY |
993 | ftrace_release_mod(mod); |
994 | ||
22a9d645 | 995 | async_synchronize_full(); |
75676500 | 996 | |
e14af7ee | 997 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 998 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 999 | |
75676500 RR |
1000 | free_module(mod); |
1001 | return 0; | |
1002 | out: | |
6389a385 | 1003 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1004 | return ret; |
1005 | } | |
1006 | ||
d1e99d7a | 1007 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1008 | { |
1009 | struct module_use *use; | |
1010 | int printed_something = 0; | |
1011 | ||
d5db139a | 1012 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1013 | |
6da0b565 IA |
1014 | /* |
1015 | * Always include a trailing , so userspace can differentiate | |
1016 | * between this and the old multi-field proc format. | |
1017 | */ | |
2c02dfe7 | 1018 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1019 | printed_something = 1; |
2c02dfe7 | 1020 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1021 | } |
1022 | ||
1da177e4 LT |
1023 | if (mod->init != NULL && mod->exit == NULL) { |
1024 | printed_something = 1; | |
6da0b565 | 1025 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1026 | } |
1027 | ||
1028 | if (!printed_something) | |
6da0b565 | 1029 | seq_puts(m, "-"); |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | void __symbol_put(const char *symbol) | |
1033 | { | |
1034 | struct module *owner; | |
1da177e4 | 1035 | |
24da1cbf | 1036 | preempt_disable(); |
414fd31b | 1037 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1038 | BUG(); |
1039 | module_put(owner); | |
24da1cbf | 1040 | preempt_enable(); |
1da177e4 LT |
1041 | } |
1042 | EXPORT_SYMBOL(__symbol_put); | |
1043 | ||
7d1d16e4 | 1044 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1045 | void symbol_put_addr(void *addr) |
1046 | { | |
5e376613 | 1047 | struct module *modaddr; |
7d1d16e4 | 1048 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1049 | |
7d1d16e4 | 1050 | if (core_kernel_text(a)) |
5e376613 | 1051 | return; |
1da177e4 | 1052 | |
275d7d44 PZ |
1053 | /* |
1054 | * Even though we hold a reference on the module; we still need to | |
1055 | * disable preemption in order to safely traverse the data structure. | |
1056 | */ | |
1057 | preempt_disable(); | |
7d1d16e4 | 1058 | modaddr = __module_text_address(a); |
a6e6abd5 | 1059 | BUG_ON(!modaddr); |
5e376613 | 1060 | module_put(modaddr); |
275d7d44 | 1061 | preempt_enable(); |
1da177e4 LT |
1062 | } |
1063 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1064 | ||
1065 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1066 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1067 | { |
d5db139a | 1068 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1069 | } |
1070 | ||
cca3e707 KS |
1071 | static struct module_attribute modinfo_refcnt = |
1072 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1073 | |
d53799be SR |
1074 | void __module_get(struct module *module) |
1075 | { | |
1076 | if (module) { | |
1077 | preempt_disable(); | |
2f35c41f | 1078 | atomic_inc(&module->refcnt); |
d53799be SR |
1079 | trace_module_get(module, _RET_IP_); |
1080 | preempt_enable(); | |
1081 | } | |
1082 | } | |
1083 | EXPORT_SYMBOL(__module_get); | |
1084 | ||
1085 | bool try_module_get(struct module *module) | |
1086 | { | |
1087 | bool ret = true; | |
1088 | ||
1089 | if (module) { | |
1090 | preempt_disable(); | |
e513cc1c MH |
1091 | /* Note: here, we can fail to get a reference */ |
1092 | if (likely(module_is_live(module) && | |
1093 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1094 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1095 | else |
d53799be SR |
1096 | ret = false; |
1097 | ||
1098 | preempt_enable(); | |
1099 | } | |
1100 | return ret; | |
1101 | } | |
1102 | EXPORT_SYMBOL(try_module_get); | |
1103 | ||
f6a57033 AV |
1104 | void module_put(struct module *module) |
1105 | { | |
e513cc1c MH |
1106 | int ret; |
1107 | ||
f6a57033 | 1108 | if (module) { |
e1783a24 | 1109 | preempt_disable(); |
e513cc1c MH |
1110 | ret = atomic_dec_if_positive(&module->refcnt); |
1111 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1112 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1113 | preempt_enable(); |
f6a57033 AV |
1114 | } |
1115 | } | |
1116 | EXPORT_SYMBOL(module_put); | |
1117 | ||
1da177e4 | 1118 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1119 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1120 | { |
1121 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1122 | seq_puts(m, " - -"); |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | static inline void module_unload_free(struct module *mod) | |
1126 | { | |
1127 | } | |
1128 | ||
9bea7f23 | 1129 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1130 | { |
9bea7f23 | 1131 | return strong_try_module_get(b); |
1da177e4 | 1132 | } |
9bea7f23 | 1133 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1134 | |
9f85a4bb | 1135 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1136 | { |
9f85a4bb | 1137 | return 0; |
1da177e4 LT |
1138 | } |
1139 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1140 | ||
53999bf3 KW |
1141 | static size_t module_flags_taint(struct module *mod, char *buf) |
1142 | { | |
1143 | size_t l = 0; | |
7fd8329b PM |
1144 | int i; |
1145 | ||
1146 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1147 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1148 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1149 | } |
53999bf3 | 1150 | |
53999bf3 KW |
1151 | return l; |
1152 | } | |
1153 | ||
1f71740a | 1154 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1155 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1156 | { |
1157 | const char *state = "unknown"; | |
1158 | ||
4befb026 | 1159 | switch (mk->mod->state) { |
1f71740a KS |
1160 | case MODULE_STATE_LIVE: |
1161 | state = "live"; | |
1162 | break; | |
1163 | case MODULE_STATE_COMING: | |
1164 | state = "coming"; | |
1165 | break; | |
1166 | case MODULE_STATE_GOING: | |
1167 | state = "going"; | |
1168 | break; | |
0d21b0e3 RR |
1169 | default: |
1170 | BUG(); | |
1f71740a KS |
1171 | } |
1172 | return sprintf(buffer, "%s\n", state); | |
1173 | } | |
1174 | ||
cca3e707 KS |
1175 | static struct module_attribute modinfo_initstate = |
1176 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1177 | |
88bfa324 KS |
1178 | static ssize_t store_uevent(struct module_attribute *mattr, |
1179 | struct module_kobject *mk, | |
1180 | const char *buffer, size_t count) | |
1181 | { | |
1182 | enum kobject_action action; | |
1183 | ||
1184 | if (kobject_action_type(buffer, count, &action) == 0) | |
1185 | kobject_uevent(&mk->kobj, action); | |
1186 | return count; | |
1187 | } | |
1188 | ||
cca3e707 KS |
1189 | struct module_attribute module_uevent = |
1190 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1191 | ||
1192 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1193 | struct module_kobject *mk, char *buffer) | |
1194 | { | |
7523e4dc | 1195 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1196 | } |
1197 | ||
1198 | static struct module_attribute modinfo_coresize = | |
1199 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1200 | ||
1201 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1202 | struct module_kobject *mk, char *buffer) | |
1203 | { | |
7523e4dc | 1204 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1205 | } |
1206 | ||
1207 | static struct module_attribute modinfo_initsize = | |
1208 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1209 | ||
1210 | static ssize_t show_taint(struct module_attribute *mattr, | |
1211 | struct module_kobject *mk, char *buffer) | |
1212 | { | |
1213 | size_t l; | |
1214 | ||
1215 | l = module_flags_taint(mk->mod, buffer); | |
1216 | buffer[l++] = '\n'; | |
1217 | return l; | |
1218 | } | |
1219 | ||
1220 | static struct module_attribute modinfo_taint = | |
1221 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1222 | |
03e88ae1 | 1223 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1224 | &module_uevent, |
03e88ae1 GKH |
1225 | &modinfo_version, |
1226 | &modinfo_srcversion, | |
cca3e707 KS |
1227 | &modinfo_initstate, |
1228 | &modinfo_coresize, | |
1229 | &modinfo_initsize, | |
1230 | &modinfo_taint, | |
03e88ae1 | 1231 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1232 | &modinfo_refcnt, |
03e88ae1 GKH |
1233 | #endif |
1234 | NULL, | |
1235 | }; | |
1236 | ||
1da177e4 LT |
1237 | static const char vermagic[] = VERMAGIC_STRING; |
1238 | ||
c6e665c8 | 1239 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1240 | { |
1241 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1242 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1243 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1244 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1245 | return 0; |
1246 | #else | |
1247 | return -ENOEXEC; | |
1248 | #endif | |
1249 | } | |
1250 | ||
1da177e4 | 1251 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1252 | |
1253 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1254 | { |
71810db2 | 1255 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1256 | } |
1257 | ||
1da177e4 LT |
1258 | static int check_version(Elf_Shdr *sechdrs, |
1259 | unsigned int versindex, | |
1260 | const char *symname, | |
6da0b565 | 1261 | struct module *mod, |
71810db2 | 1262 | const s32 *crc) |
1da177e4 LT |
1263 | { |
1264 | unsigned int i, num_versions; | |
1265 | struct modversion_info *versions; | |
1266 | ||
1267 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1268 | if (!crc) | |
1269 | return 1; | |
1270 | ||
a5dd6970 RR |
1271 | /* No versions at all? modprobe --force does this. */ |
1272 | if (versindex == 0) | |
1273 | return try_to_force_load(mod, symname) == 0; | |
1274 | ||
1da177e4 LT |
1275 | versions = (void *) sechdrs[versindex].sh_addr; |
1276 | num_versions = sechdrs[versindex].sh_size | |
1277 | / sizeof(struct modversion_info); | |
1278 | ||
1279 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1280 | u32 crcval; |
1281 | ||
1da177e4 LT |
1282 | if (strcmp(versions[i].name, symname) != 0) |
1283 | continue; | |
1284 | ||
71810db2 AB |
1285 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1286 | crcval = resolve_rel_crc(crc); | |
1287 | else | |
1288 | crcval = *crc; | |
1289 | if (versions[i].crc == crcval) | |
1da177e4 | 1290 | return 1; |
71810db2 AB |
1291 | pr_debug("Found checksum %X vs module %lX\n", |
1292 | crcval, versions[i].crc); | |
826e4506 | 1293 | goto bad_version; |
1da177e4 | 1294 | } |
826e4506 | 1295 | |
faaae2a5 LT |
1296 | /* Broken toolchain. Warn once, then let it go.. */ |
1297 | pr_warn_once("%s: no symbol version for %s\n", mod->name, symname); | |
1298 | return 1; | |
826e4506 LT |
1299 | |
1300 | bad_version: | |
6da0b565 | 1301 | pr_warn("%s: disagrees about version of symbol %s\n", |
826e4506 LT |
1302 | mod->name, symname); |
1303 | return 0; | |
1da177e4 LT |
1304 | } |
1305 | ||
1306 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1307 | unsigned int versindex, | |
1308 | struct module *mod) | |
1309 | { | |
71810db2 | 1310 | const s32 *crc; |
1da177e4 | 1311 | |
926a59b1 PZ |
1312 | /* |
1313 | * Since this should be found in kernel (which can't be removed), no | |
1314 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1315 | */ | |
1316 | preempt_disable(); | |
b92021b0 | 1317 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
926a59b1 PZ |
1318 | &crc, true, false)) { |
1319 | preempt_enable(); | |
1da177e4 | 1320 | BUG(); |
926a59b1 PZ |
1321 | } |
1322 | preempt_enable(); | |
a4b6a77b | 1323 | return check_version(sechdrs, versindex, |
71810db2 | 1324 | VMLINUX_SYMBOL_STR(module_layout), mod, crc); |
1da177e4 LT |
1325 | } |
1326 | ||
91e37a79 RR |
1327 | /* First part is kernel version, which we ignore if module has crcs. */ |
1328 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1329 | bool has_crcs) | |
1da177e4 | 1330 | { |
91e37a79 RR |
1331 | if (has_crcs) { |
1332 | amagic += strcspn(amagic, " "); | |
1333 | bmagic += strcspn(bmagic, " "); | |
1334 | } | |
1da177e4 LT |
1335 | return strcmp(amagic, bmagic) == 0; |
1336 | } | |
1337 | #else | |
1338 | static inline int check_version(Elf_Shdr *sechdrs, | |
1339 | unsigned int versindex, | |
1340 | const char *symname, | |
6da0b565 | 1341 | struct module *mod, |
71810db2 | 1342 | const s32 *crc) |
1da177e4 LT |
1343 | { |
1344 | return 1; | |
1345 | } | |
1346 | ||
1347 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1348 | unsigned int versindex, | |
1349 | struct module *mod) | |
1350 | { | |
1351 | return 1; | |
1352 | } | |
1353 | ||
91e37a79 RR |
1354 | static inline int same_magic(const char *amagic, const char *bmagic, |
1355 | bool has_crcs) | |
1da177e4 LT |
1356 | { |
1357 | return strcmp(amagic, bmagic) == 0; | |
1358 | } | |
1359 | #endif /* CONFIG_MODVERSIONS */ | |
1360 | ||
75676500 | 1361 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1362 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1363 | const struct load_info *info, | |
414fd31b | 1364 | const char *name, |
9bea7f23 | 1365 | char ownername[]) |
1da177e4 LT |
1366 | { |
1367 | struct module *owner; | |
414fd31b | 1368 | const struct kernel_symbol *sym; |
71810db2 | 1369 | const s32 *crc; |
9bea7f23 | 1370 | int err; |
1da177e4 | 1371 | |
d64810f5 PZ |
1372 | /* |
1373 | * The module_mutex should not be a heavily contended lock; | |
1374 | * if we get the occasional sleep here, we'll go an extra iteration | |
1375 | * in the wait_event_interruptible(), which is harmless. | |
1376 | */ | |
1377 | sched_annotate_sleep(); | |
75676500 | 1378 | mutex_lock(&module_mutex); |
414fd31b | 1379 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1380 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1381 | if (!sym) |
1382 | goto unlock; | |
1383 | ||
71810db2 | 1384 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc)) { |
9bea7f23 RR |
1385 | sym = ERR_PTR(-EINVAL); |
1386 | goto getname; | |
1da177e4 | 1387 | } |
9bea7f23 RR |
1388 | |
1389 | err = ref_module(mod, owner); | |
1390 | if (err) { | |
1391 | sym = ERR_PTR(err); | |
1392 | goto getname; | |
1393 | } | |
1394 | ||
1395 | getname: | |
1396 | /* We must make copy under the lock if we failed to get ref. */ | |
1397 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1398 | unlock: | |
75676500 | 1399 | mutex_unlock(&module_mutex); |
218ce735 | 1400 | return sym; |
1da177e4 LT |
1401 | } |
1402 | ||
49668688 RR |
1403 | static const struct kernel_symbol * |
1404 | resolve_symbol_wait(struct module *mod, | |
1405 | const struct load_info *info, | |
1406 | const char *name) | |
9bea7f23 RR |
1407 | { |
1408 | const struct kernel_symbol *ksym; | |
49668688 | 1409 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1410 | |
1411 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1412 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1413 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1414 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1415 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1416 | mod->name, owner); | |
9bea7f23 RR |
1417 | } |
1418 | return ksym; | |
1419 | } | |
1420 | ||
1da177e4 LT |
1421 | /* |
1422 | * /sys/module/foo/sections stuff | |
1423 | * J. Corbet <corbet@lwn.net> | |
1424 | */ | |
8f6d0378 | 1425 | #ifdef CONFIG_SYSFS |
10b465aa | 1426 | |
8f6d0378 | 1427 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1428 | static inline bool sect_empty(const Elf_Shdr *sect) |
1429 | { | |
1430 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1431 | } | |
1432 | ||
6da0b565 | 1433 | struct module_sect_attr { |
a58730c4 RR |
1434 | struct module_attribute mattr; |
1435 | char *name; | |
1436 | unsigned long address; | |
1437 | }; | |
1438 | ||
6da0b565 | 1439 | struct module_sect_attrs { |
a58730c4 RR |
1440 | struct attribute_group grp; |
1441 | unsigned int nsections; | |
1442 | struct module_sect_attr attrs[0]; | |
1443 | }; | |
1444 | ||
1da177e4 | 1445 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1446 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1447 | { |
1448 | struct module_sect_attr *sattr = | |
1449 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1450 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1451 | } |
1452 | ||
04b1db9f IN |
1453 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1454 | { | |
a58730c4 | 1455 | unsigned int section; |
04b1db9f IN |
1456 | |
1457 | for (section = 0; section < sect_attrs->nsections; section++) | |
1458 | kfree(sect_attrs->attrs[section].name); | |
1459 | kfree(sect_attrs); | |
1460 | } | |
1461 | ||
8f6d0378 | 1462 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1463 | { |
1464 | unsigned int nloaded = 0, i, size[2]; | |
1465 | struct module_sect_attrs *sect_attrs; | |
1466 | struct module_sect_attr *sattr; | |
1467 | struct attribute **gattr; | |
22a8bdeb | 1468 | |
1da177e4 | 1469 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1470 | for (i = 0; i < info->hdr->e_shnum; i++) |
1471 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1472 | nloaded++; |
1473 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1474 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1475 | sizeof(sect_attrs->grp.attrs[0])); | |
1476 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1477 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1478 | if (sect_attrs == NULL) | |
1da177e4 LT |
1479 | return; |
1480 | ||
1481 | /* Setup section attributes. */ | |
1482 | sect_attrs->grp.name = "sections"; | |
1483 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1484 | ||
04b1db9f | 1485 | sect_attrs->nsections = 0; |
1da177e4 LT |
1486 | sattr = §_attrs->attrs[0]; |
1487 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1488 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1489 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1490 | if (sect_empty(sec)) | |
35dead42 | 1491 | continue; |
8f6d0378 RR |
1492 | sattr->address = sec->sh_addr; |
1493 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1494 | GFP_KERNEL); |
1495 | if (sattr->name == NULL) | |
1496 | goto out; | |
1497 | sect_attrs->nsections++; | |
361795b1 | 1498 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1499 | sattr->mattr.show = module_sect_show; |
1500 | sattr->mattr.store = NULL; | |
1501 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1502 | sattr->mattr.attr.mode = S_IRUGO; |
1503 | *(gattr++) = &(sattr++)->mattr.attr; | |
1504 | } | |
1505 | *gattr = NULL; | |
1506 | ||
1507 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1508 | goto out; | |
1509 | ||
1510 | mod->sect_attrs = sect_attrs; | |
1511 | return; | |
1512 | out: | |
04b1db9f | 1513 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1514 | } |
1515 | ||
1516 | static void remove_sect_attrs(struct module *mod) | |
1517 | { | |
1518 | if (mod->sect_attrs) { | |
1519 | sysfs_remove_group(&mod->mkobj.kobj, | |
1520 | &mod->sect_attrs->grp); | |
1521 | /* We are positive that no one is using any sect attrs | |
1522 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1523 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1524 | mod->sect_attrs = NULL; |
1525 | } | |
1526 | } | |
1527 | ||
6d760133 RM |
1528 | /* |
1529 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1530 | */ | |
1531 | ||
1532 | struct module_notes_attrs { | |
1533 | struct kobject *dir; | |
1534 | unsigned int notes; | |
1535 | struct bin_attribute attrs[0]; | |
1536 | }; | |
1537 | ||
2c3c8bea | 1538 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1539 | struct bin_attribute *bin_attr, |
1540 | char *buf, loff_t pos, size_t count) | |
1541 | { | |
1542 | /* | |
1543 | * The caller checked the pos and count against our size. | |
1544 | */ | |
1545 | memcpy(buf, bin_attr->private + pos, count); | |
1546 | return count; | |
1547 | } | |
1548 | ||
1549 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1550 | unsigned int i) | |
1551 | { | |
1552 | if (notes_attrs->dir) { | |
1553 | while (i-- > 0) | |
1554 | sysfs_remove_bin_file(notes_attrs->dir, | |
1555 | ¬es_attrs->attrs[i]); | |
e9432093 | 1556 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1557 | } |
1558 | kfree(notes_attrs); | |
1559 | } | |
1560 | ||
8f6d0378 | 1561 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1562 | { |
1563 | unsigned int notes, loaded, i; | |
1564 | struct module_notes_attrs *notes_attrs; | |
1565 | struct bin_attribute *nattr; | |
1566 | ||
ea6bff36 IM |
1567 | /* failed to create section attributes, so can't create notes */ |
1568 | if (!mod->sect_attrs) | |
1569 | return; | |
1570 | ||
6d760133 RM |
1571 | /* Count notes sections and allocate structures. */ |
1572 | notes = 0; | |
8f6d0378 RR |
1573 | for (i = 0; i < info->hdr->e_shnum; i++) |
1574 | if (!sect_empty(&info->sechdrs[i]) && | |
1575 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1576 | ++notes; |
1577 | ||
1578 | if (notes == 0) | |
1579 | return; | |
1580 | ||
1581 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1582 | + notes * sizeof(notes_attrs->attrs[0]), | |
1583 | GFP_KERNEL); | |
1584 | if (notes_attrs == NULL) | |
1585 | return; | |
1586 | ||
1587 | notes_attrs->notes = notes; | |
1588 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1589 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1590 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1591 | continue; |
8f6d0378 | 1592 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1593 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1594 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1595 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1596 | nattr->size = info->sechdrs[i].sh_size; |
1597 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1598 | nattr->read = module_notes_read; |
1599 | ++nattr; | |
1600 | } | |
1601 | ++loaded; | |
1602 | } | |
1603 | ||
4ff6abff | 1604 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1605 | if (!notes_attrs->dir) |
1606 | goto out; | |
1607 | ||
1608 | for (i = 0; i < notes; ++i) | |
1609 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1610 | ¬es_attrs->attrs[i])) | |
1611 | goto out; | |
1612 | ||
1613 | mod->notes_attrs = notes_attrs; | |
1614 | return; | |
1615 | ||
1616 | out: | |
1617 | free_notes_attrs(notes_attrs, i); | |
1618 | } | |
1619 | ||
1620 | static void remove_notes_attrs(struct module *mod) | |
1621 | { | |
1622 | if (mod->notes_attrs) | |
1623 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1624 | } | |
1625 | ||
1da177e4 | 1626 | #else |
04b1db9f | 1627 | |
8f6d0378 RR |
1628 | static inline void add_sect_attrs(struct module *mod, |
1629 | const struct load_info *info) | |
1da177e4 LT |
1630 | { |
1631 | } | |
1632 | ||
1633 | static inline void remove_sect_attrs(struct module *mod) | |
1634 | { | |
1635 | } | |
6d760133 | 1636 | |
8f6d0378 RR |
1637 | static inline void add_notes_attrs(struct module *mod, |
1638 | const struct load_info *info) | |
6d760133 RM |
1639 | { |
1640 | } | |
1641 | ||
1642 | static inline void remove_notes_attrs(struct module *mod) | |
1643 | { | |
1644 | } | |
8f6d0378 | 1645 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1646 | |
80a3d1bb RR |
1647 | static void add_usage_links(struct module *mod) |
1648 | { | |
1649 | #ifdef CONFIG_MODULE_UNLOAD | |
1650 | struct module_use *use; | |
1651 | int nowarn; | |
1652 | ||
75676500 | 1653 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1654 | list_for_each_entry(use, &mod->target_list, target_list) { |
1655 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1656 | &mod->mkobj.kobj, mod->name); | |
1657 | } | |
75676500 | 1658 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1659 | #endif |
1660 | } | |
1661 | ||
1662 | static void del_usage_links(struct module *mod) | |
1663 | { | |
1664 | #ifdef CONFIG_MODULE_UNLOAD | |
1665 | struct module_use *use; | |
1666 | ||
75676500 | 1667 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1668 | list_for_each_entry(use, &mod->target_list, target_list) |
1669 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1670 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1671 | #endif |
1672 | } | |
1673 | ||
6407ebb2 | 1674 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1675 | { |
1676 | struct module_attribute *attr; | |
03e88ae1 | 1677 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1678 | int error = 0; |
1679 | int i; | |
1680 | ||
03e88ae1 GKH |
1681 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1682 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1683 | GFP_KERNEL); | |
1684 | if (!mod->modinfo_attrs) | |
1685 | return -ENOMEM; | |
1686 | ||
1687 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 | 1688 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
c75b590d | 1689 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1690 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1691 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1692 | error = sysfs_create_file(&mod->mkobj.kobj, |
1693 | &temp_attr->attr); | |
03e88ae1 GKH |
1694 | ++temp_attr; |
1695 | } | |
c988d2b2 MD |
1696 | } |
1697 | return error; | |
1698 | } | |
1699 | ||
6407ebb2 | 1700 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1701 | { |
1702 | struct module_attribute *attr; | |
1703 | int i; | |
1704 | ||
03e88ae1 GKH |
1705 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1706 | /* pick a field to test for end of list */ | |
1707 | if (!attr->attr.name) | |
1708 | break; | |
6da0b565 | 1709 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1710 | if (attr->free) |
1711 | attr->free(mod); | |
c988d2b2 | 1712 | } |
03e88ae1 | 1713 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1714 | } |
1da177e4 | 1715 | |
942e4431 LZ |
1716 | static void mod_kobject_put(struct module *mod) |
1717 | { | |
1718 | DECLARE_COMPLETION_ONSTACK(c); | |
1719 | mod->mkobj.kobj_completion = &c; | |
1720 | kobject_put(&mod->mkobj.kobj); | |
1721 | wait_for_completion(&c); | |
1722 | } | |
1723 | ||
6407ebb2 | 1724 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1725 | { |
1726 | int err; | |
6494a93d | 1727 | struct kobject *kobj; |
1da177e4 | 1728 | |
823bccfc | 1729 | if (!module_sysfs_initialized) { |
bddb12b3 | 1730 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1731 | err = -EINVAL; |
1732 | goto out; | |
1733 | } | |
6494a93d GKH |
1734 | |
1735 | kobj = kset_find_obj(module_kset, mod->name); | |
1736 | if (kobj) { | |
bddb12b3 | 1737 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1738 | kobject_put(kobj); |
1739 | err = -EINVAL; | |
1740 | goto out; | |
1741 | } | |
1742 | ||
1da177e4 | 1743 | mod->mkobj.mod = mod; |
e17e0f51 | 1744 | |
ac3c8141 GKH |
1745 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1746 | mod->mkobj.kobj.kset = module_kset; | |
1747 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1748 | "%s", mod->name); | |
1749 | if (err) | |
942e4431 | 1750 | mod_kobject_put(mod); |
270a6c4c | 1751 | |
97c146ef | 1752 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1753 | out: |
1754 | return err; | |
1755 | } | |
1756 | ||
6407ebb2 | 1757 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1758 | const struct load_info *info, |
270a6c4c KS |
1759 | struct kernel_param *kparam, |
1760 | unsigned int num_params) | |
1761 | { | |
1762 | int err; | |
1763 | ||
80a3d1bb RR |
1764 | err = mod_sysfs_init(mod); |
1765 | if (err) | |
1766 | goto out; | |
1767 | ||
4ff6abff | 1768 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1769 | if (!mod->holders_dir) { |
1770 | err = -ENOMEM; | |
270a6c4c | 1771 | goto out_unreg; |
240936e1 | 1772 | } |
270a6c4c | 1773 | |
1da177e4 LT |
1774 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1775 | if (err) | |
270a6c4c | 1776 | goto out_unreg_holders; |
1da177e4 | 1777 | |
c988d2b2 MD |
1778 | err = module_add_modinfo_attrs(mod); |
1779 | if (err) | |
e17e0f51 | 1780 | goto out_unreg_param; |
c988d2b2 | 1781 | |
80a3d1bb | 1782 | add_usage_links(mod); |
8f6d0378 RR |
1783 | add_sect_attrs(mod, info); |
1784 | add_notes_attrs(mod, info); | |
80a3d1bb | 1785 | |
e17e0f51 | 1786 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1787 | return 0; |
1788 | ||
e17e0f51 KS |
1789 | out_unreg_param: |
1790 | module_param_sysfs_remove(mod); | |
270a6c4c | 1791 | out_unreg_holders: |
78a2d906 | 1792 | kobject_put(mod->holders_dir); |
270a6c4c | 1793 | out_unreg: |
942e4431 | 1794 | mod_kobject_put(mod); |
80a3d1bb | 1795 | out: |
1da177e4 LT |
1796 | return err; |
1797 | } | |
34e4e2fe DL |
1798 | |
1799 | static void mod_sysfs_fini(struct module *mod) | |
1800 | { | |
8f6d0378 RR |
1801 | remove_notes_attrs(mod); |
1802 | remove_sect_attrs(mod); | |
942e4431 | 1803 | mod_kobject_put(mod); |
34e4e2fe DL |
1804 | } |
1805 | ||
cf2fde7b RR |
1806 | static void init_param_lock(struct module *mod) |
1807 | { | |
1808 | mutex_init(&mod->param_lock); | |
1809 | } | |
8f6d0378 | 1810 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1811 | |
8f6d0378 RR |
1812 | static int mod_sysfs_setup(struct module *mod, |
1813 | const struct load_info *info, | |
6407ebb2 RR |
1814 | struct kernel_param *kparam, |
1815 | unsigned int num_params) | |
1816 | { | |
1817 | return 0; | |
1818 | } | |
1819 | ||
34e4e2fe DL |
1820 | static void mod_sysfs_fini(struct module *mod) |
1821 | { | |
1822 | } | |
1823 | ||
36b0360d RR |
1824 | static void module_remove_modinfo_attrs(struct module *mod) |
1825 | { | |
1826 | } | |
1827 | ||
80a3d1bb RR |
1828 | static void del_usage_links(struct module *mod) |
1829 | { | |
1830 | } | |
1831 | ||
cf2fde7b RR |
1832 | static void init_param_lock(struct module *mod) |
1833 | { | |
1834 | } | |
34e4e2fe | 1835 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1836 | |
36b0360d | 1837 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1838 | { |
80a3d1bb | 1839 | del_usage_links(mod); |
c988d2b2 | 1840 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1841 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1842 | kobject_put(mod->mkobj.drivers_dir); |
1843 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1844 | mod_sysfs_fini(mod); |
1da177e4 LT |
1845 | } |
1846 | ||
84e1c6bb MC |
1847 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1848 | /* | |
1849 | * LKM RO/NX protection: protect module's text/ro-data | |
1850 | * from modification and any data from execution. | |
85c898db RR |
1851 | * |
1852 | * General layout of module is: | |
444d13ff JY |
1853 | * [text] [read-only-data] [ro-after-init] [writable data] |
1854 | * text_size -----^ ^ ^ ^ | |
1855 | * ro_size ------------------------| | | | |
1856 | * ro_after_init_size -----------------------------| | | |
1857 | * size -----------------------------------------------------------| | |
85c898db RR |
1858 | * |
1859 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1860 | */ |
85c898db RR |
1861 | static void frob_text(const struct module_layout *layout, |
1862 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1863 | { |
85c898db RR |
1864 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1865 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1866 | set_memory((unsigned long)layout->base, | |
1867 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1868 | } |
84e1c6bb | 1869 | |
85c898db RR |
1870 | static void frob_rodata(const struct module_layout *layout, |
1871 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1872 | { |
85c898db RR |
1873 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1874 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1875 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1876 | set_memory((unsigned long)layout->base + layout->text_size, | |
1877 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1878 | } |
1879 | ||
444d13ff JY |
1880 | static void frob_ro_after_init(const struct module_layout *layout, |
1881 | int (*set_memory)(unsigned long start, int num_pages)) | |
1882 | { | |
1883 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1884 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1885 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1886 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1887 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1888 | } | |
1889 | ||
85c898db RR |
1890 | static void frob_writable_data(const struct module_layout *layout, |
1891 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1892 | { |
85c898db | 1893 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1894 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1895 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1896 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1897 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1898 | } |
84e1c6bb | 1899 | |
85c898db RR |
1900 | /* livepatching wants to disable read-only so it can frob module. */ |
1901 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1902 | { |
39290b38 AT |
1903 | if (!rodata_enabled) |
1904 | return; | |
1905 | ||
85c898db RR |
1906 | frob_text(&mod->core_layout, set_memory_rw); |
1907 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 1908 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
1909 | frob_text(&mod->init_layout, set_memory_rw); |
1910 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1911 | } |
84e1c6bb | 1912 | |
444d13ff | 1913 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 1914 | { |
39290b38 AT |
1915 | if (!rodata_enabled) |
1916 | return; | |
1917 | ||
85c898db RR |
1918 | frob_text(&mod->core_layout, set_memory_ro); |
1919 | frob_rodata(&mod->core_layout, set_memory_ro); | |
1920 | frob_text(&mod->init_layout, set_memory_ro); | |
1921 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
1922 | |
1923 | if (after_init) | |
1924 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
1925 | } |
1926 | ||
85c898db | 1927 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 1928 | { |
85c898db | 1929 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 1930 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
1931 | frob_writable_data(&mod->core_layout, set_memory_nx); |
1932 | frob_rodata(&mod->init_layout, set_memory_nx); | |
1933 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
1934 | } |
1935 | ||
85c898db | 1936 | static void module_disable_nx(const struct module *mod) |
01526ed0 | 1937 | { |
85c898db | 1938 | frob_rodata(&mod->core_layout, set_memory_x); |
444d13ff | 1939 | frob_ro_after_init(&mod->core_layout, set_memory_x); |
85c898db RR |
1940 | frob_writable_data(&mod->core_layout, set_memory_x); |
1941 | frob_rodata(&mod->init_layout, set_memory_x); | |
1942 | frob_writable_data(&mod->init_layout, set_memory_x); | |
84e1c6bb MC |
1943 | } |
1944 | ||
1945 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1946 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
1947 | { |
1948 | struct module *mod; | |
1949 | ||
39290b38 AT |
1950 | if (!rodata_enabled) |
1951 | return; | |
1952 | ||
84e1c6bb MC |
1953 | mutex_lock(&module_mutex); |
1954 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1955 | if (mod->state == MODULE_STATE_UNFORMED) |
1956 | continue; | |
85c898db RR |
1957 | |
1958 | frob_text(&mod->core_layout, set_memory_rw); | |
1959 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb MC |
1960 | } |
1961 | mutex_unlock(&module_mutex); | |
1962 | } | |
1963 | ||
1964 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1965 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
1966 | { |
1967 | struct module *mod; | |
1968 | ||
39290b38 AT |
1969 | if (!rodata_enabled) |
1970 | return; | |
1971 | ||
84e1c6bb MC |
1972 | mutex_lock(&module_mutex); |
1973 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
1974 | /* |
1975 | * Ignore going modules since it's possible that ro | |
1976 | * protection has already been disabled, otherwise we'll | |
1977 | * run into protection faults at module deallocation. | |
1978 | */ | |
1979 | if (mod->state == MODULE_STATE_UNFORMED || | |
1980 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 1981 | continue; |
85c898db RR |
1982 | |
1983 | frob_text(&mod->core_layout, set_memory_ro); | |
1984 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb MC |
1985 | } |
1986 | mutex_unlock(&module_mutex); | |
1987 | } | |
85c898db RR |
1988 | |
1989 | static void disable_ro_nx(const struct module_layout *layout) | |
1990 | { | |
39290b38 AT |
1991 | if (rodata_enabled) { |
1992 | frob_text(layout, set_memory_rw); | |
1993 | frob_rodata(layout, set_memory_rw); | |
1994 | frob_ro_after_init(layout, set_memory_rw); | |
1995 | } | |
85c898db | 1996 | frob_rodata(layout, set_memory_x); |
444d13ff | 1997 | frob_ro_after_init(layout, set_memory_x); |
85c898db RR |
1998 | frob_writable_data(layout, set_memory_x); |
1999 | } | |
2000 | ||
84e1c6bb | 2001 | #else |
85c898db RR |
2002 | static void disable_ro_nx(const struct module_layout *layout) { } |
2003 | static void module_enable_nx(const struct module *mod) { } | |
2004 | static void module_disable_nx(const struct module *mod) { } | |
84e1c6bb MC |
2005 | #endif |
2006 | ||
1ce15ef4 JY |
2007 | #ifdef CONFIG_LIVEPATCH |
2008 | /* | |
2009 | * Persist Elf information about a module. Copy the Elf header, | |
2010 | * section header table, section string table, and symtab section | |
2011 | * index from info to mod->klp_info. | |
2012 | */ | |
2013 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2014 | { | |
2015 | unsigned int size, symndx; | |
2016 | int ret; | |
2017 | ||
2018 | size = sizeof(*mod->klp_info); | |
2019 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2020 | if (mod->klp_info == NULL) | |
2021 | return -ENOMEM; | |
2022 | ||
2023 | /* Elf header */ | |
2024 | size = sizeof(mod->klp_info->hdr); | |
2025 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2026 | ||
2027 | /* Elf section header table */ | |
2028 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
2029 | mod->klp_info->sechdrs = kmalloc(size, GFP_KERNEL); | |
2030 | if (mod->klp_info->sechdrs == NULL) { | |
2031 | ret = -ENOMEM; | |
2032 | goto free_info; | |
2033 | } | |
2034 | memcpy(mod->klp_info->sechdrs, info->sechdrs, size); | |
2035 | ||
2036 | /* Elf section name string table */ | |
2037 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
2038 | mod->klp_info->secstrings = kmalloc(size, GFP_KERNEL); | |
2039 | if (mod->klp_info->secstrings == NULL) { | |
2040 | ret = -ENOMEM; | |
2041 | goto free_sechdrs; | |
2042 | } | |
2043 | memcpy(mod->klp_info->secstrings, info->secstrings, size); | |
2044 | ||
2045 | /* Elf symbol section index */ | |
2046 | symndx = info->index.sym; | |
2047 | mod->klp_info->symndx = symndx; | |
2048 | ||
2049 | /* | |
2050 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2051 | * copy of the original symbol table. Adjust sh_addr to point | |
2052 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2053 | * init memory is freed at the end of do_init_module(). | |
2054 | */ | |
2055 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2056 | (unsigned long) mod->core_kallsyms.symtab; | |
2057 | ||
2058 | return 0; | |
2059 | ||
2060 | free_sechdrs: | |
2061 | kfree(mod->klp_info->sechdrs); | |
2062 | free_info: | |
2063 | kfree(mod->klp_info); | |
2064 | return ret; | |
2065 | } | |
2066 | ||
2067 | static void free_module_elf(struct module *mod) | |
2068 | { | |
2069 | kfree(mod->klp_info->sechdrs); | |
2070 | kfree(mod->klp_info->secstrings); | |
2071 | kfree(mod->klp_info); | |
2072 | } | |
2073 | #else /* !CONFIG_LIVEPATCH */ | |
2074 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2075 | { | |
2076 | return 0; | |
2077 | } | |
2078 | ||
2079 | static void free_module_elf(struct module *mod) | |
2080 | { | |
2081 | } | |
2082 | #endif /* CONFIG_LIVEPATCH */ | |
2083 | ||
be1f221c | 2084 | void __weak module_memfree(void *module_region) |
74e08fcf JB |
2085 | { |
2086 | vfree(module_region); | |
2087 | } | |
2088 | ||
2089 | void __weak module_arch_cleanup(struct module *mod) | |
2090 | { | |
2091 | } | |
2092 | ||
d453cded RR |
2093 | void __weak module_arch_freeing_init(struct module *mod) |
2094 | { | |
2095 | } | |
2096 | ||
75676500 | 2097 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2098 | static void free_module(struct module *mod) |
2099 | { | |
7ead8b83 LZ |
2100 | trace_module_free(mod); |
2101 | ||
36b0360d | 2102 | mod_sysfs_teardown(mod); |
1da177e4 | 2103 | |
944a1fa0 RR |
2104 | /* We leave it in list to prevent duplicate loads, but make sure |
2105 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2106 | mutex_lock(&module_mutex); |
944a1fa0 | 2107 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2108 | mutex_unlock(&module_mutex); |
944a1fa0 | 2109 | |
b82bab4b JB |
2110 | /* Remove dynamic debug info */ |
2111 | ddebug_remove_module(mod->name); | |
2112 | ||
1da177e4 LT |
2113 | /* Arch-specific cleanup. */ |
2114 | module_arch_cleanup(mod); | |
2115 | ||
2116 | /* Module unload stuff */ | |
2117 | module_unload_free(mod); | |
2118 | ||
e180a6b7 RR |
2119 | /* Free any allocated parameters. */ |
2120 | destroy_params(mod->kp, mod->num_kp); | |
2121 | ||
1ce15ef4 JY |
2122 | if (is_livepatch_module(mod)) |
2123 | free_module_elf(mod); | |
2124 | ||
944a1fa0 RR |
2125 | /* Now we can delete it from the lists */ |
2126 | mutex_lock(&module_mutex); | |
461e34ae MH |
2127 | /* Unlink carefully: kallsyms could be walking list. */ |
2128 | list_del_rcu(&mod->list); | |
93c2e105 | 2129 | mod_tree_remove(mod); |
0286b5ea | 2130 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2131 | module_bug_cleanup(mod); |
0be964be PZ |
2132 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
2133 | synchronize_sched(); | |
944a1fa0 RR |
2134 | mutex_unlock(&module_mutex); |
2135 | ||
85c898db RR |
2136 | /* This may be empty, but that's OK */ |
2137 | disable_ro_nx(&mod->init_layout); | |
d453cded | 2138 | module_arch_freeing_init(mod); |
7523e4dc | 2139 | module_memfree(mod->init_layout.base); |
1da177e4 | 2140 | kfree(mod->args); |
259354de | 2141 | percpu_modfree(mod); |
9f85a4bb | 2142 | |
35a9393c | 2143 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2144 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2145 | |
1da177e4 | 2146 | /* Finally, free the core (containing the module structure) */ |
85c898db | 2147 | disable_ro_nx(&mod->core_layout); |
7523e4dc | 2148 | module_memfree(mod->core_layout.base); |
eb8cdec4 BS |
2149 | |
2150 | #ifdef CONFIG_MPU | |
2151 | update_protections(current->mm); | |
2152 | #endif | |
1da177e4 LT |
2153 | } |
2154 | ||
2155 | void *__symbol_get(const char *symbol) | |
2156 | { | |
2157 | struct module *owner; | |
414fd31b | 2158 | const struct kernel_symbol *sym; |
1da177e4 | 2159 | |
24da1cbf | 2160 | preempt_disable(); |
414fd31b TA |
2161 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2162 | if (sym && strong_try_module_get(owner)) | |
2163 | sym = NULL; | |
24da1cbf | 2164 | preempt_enable(); |
1da177e4 | 2165 | |
414fd31b | 2166 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
2167 | } |
2168 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2169 | ||
eea8b54d AN |
2170 | /* |
2171 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2172 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2173 | * |
2174 | * You must hold the module_mutex. | |
eea8b54d AN |
2175 | */ |
2176 | static int verify_export_symbols(struct module *mod) | |
2177 | { | |
b211104d | 2178 | unsigned int i; |
eea8b54d | 2179 | struct module *owner; |
b211104d RR |
2180 | const struct kernel_symbol *s; |
2181 | struct { | |
2182 | const struct kernel_symbol *sym; | |
2183 | unsigned int num; | |
2184 | } arr[] = { | |
2185 | { mod->syms, mod->num_syms }, | |
2186 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2187 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2188 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2189 | { mod->unused_syms, mod->num_unused_syms }, |
2190 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2191 | #endif |
b211104d | 2192 | }; |
eea8b54d | 2193 | |
b211104d RR |
2194 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2195 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 2196 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 2197 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
2198 | " (owned by %s)\n", |
2199 | mod->name, s->name, module_name(owner)); | |
2200 | return -ENOEXEC; | |
2201 | } | |
eea8b54d | 2202 | } |
b211104d RR |
2203 | } |
2204 | return 0; | |
eea8b54d AN |
2205 | } |
2206 | ||
9a4b9708 | 2207 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2208 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2209 | { | |
2210 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2211 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2212 | unsigned long secbase; |
49668688 | 2213 | unsigned int i; |
1da177e4 | 2214 | int ret = 0; |
414fd31b | 2215 | const struct kernel_symbol *ksym; |
1da177e4 | 2216 | |
49668688 RR |
2217 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2218 | const char *name = info->strtab + sym[i].st_name; | |
2219 | ||
1da177e4 LT |
2220 | switch (sym[i].st_shndx) { |
2221 | case SHN_COMMON: | |
80375980 JM |
2222 | /* Ignore common symbols */ |
2223 | if (!strncmp(name, "__gnu_lto", 9)) | |
2224 | break; | |
2225 | ||
1da177e4 LT |
2226 | /* We compiled with -fno-common. These are not |
2227 | supposed to happen. */ | |
5e124169 | 2228 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2229 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2230 | mod->name); |
2231 | ret = -ENOEXEC; | |
2232 | break; | |
2233 | ||
2234 | case SHN_ABS: | |
2235 | /* Don't need to do anything */ | |
5e124169 | 2236 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2237 | (long)sym[i].st_value); |
2238 | break; | |
2239 | ||
1ce15ef4 JY |
2240 | case SHN_LIVEPATCH: |
2241 | /* Livepatch symbols are resolved by livepatch */ | |
2242 | break; | |
2243 | ||
1da177e4 | 2244 | case SHN_UNDEF: |
49668688 | 2245 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2246 | /* Ok if resolved. */ |
9bea7f23 | 2247 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 2248 | sym[i].st_value = ksym->value; |
1da177e4 | 2249 | break; |
414fd31b TA |
2250 | } |
2251 | ||
1da177e4 | 2252 | /* Ok if weak. */ |
9bea7f23 | 2253 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2254 | break; |
2255 | ||
bddb12b3 AM |
2256 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
2257 | mod->name, name, PTR_ERR(ksym)); | |
9bea7f23 | 2258 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
2259 | break; |
2260 | ||
2261 | default: | |
2262 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2263 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2264 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2265 | else |
49668688 | 2266 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2267 | sym[i].st_value += secbase; |
2268 | break; | |
2269 | } | |
2270 | } | |
2271 | ||
2272 | return ret; | |
2273 | } | |
2274 | ||
49668688 | 2275 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2276 | { |
2277 | unsigned int i; | |
2278 | int err = 0; | |
2279 | ||
2280 | /* Now do relocations. */ | |
49668688 RR |
2281 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2282 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2283 | |
2284 | /* Not a valid relocation section? */ | |
49668688 | 2285 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2286 | continue; |
2287 | ||
2288 | /* Don't bother with non-allocated sections */ | |
49668688 | 2289 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2290 | continue; |
2291 | ||
1ce15ef4 JY |
2292 | /* Livepatch relocation sections are applied by livepatch */ |
2293 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2294 | continue; | |
2295 | ||
49668688 RR |
2296 | if (info->sechdrs[i].sh_type == SHT_REL) |
2297 | err = apply_relocate(info->sechdrs, info->strtab, | |
2298 | info->index.sym, i, mod); | |
2299 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2300 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2301 | info->index.sym, i, mod); | |
22e268eb RR |
2302 | if (err < 0) |
2303 | break; | |
2304 | } | |
2305 | return err; | |
2306 | } | |
2307 | ||
088af9a6 HD |
2308 | /* Additional bytes needed by arch in front of individual sections */ |
2309 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2310 | unsigned int section) | |
2311 | { | |
2312 | /* default implementation just returns zero */ | |
2313 | return 0; | |
2314 | } | |
2315 | ||
1da177e4 | 2316 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2317 | static long get_offset(struct module *mod, unsigned int *size, |
2318 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2319 | { |
2320 | long ret; | |
2321 | ||
088af9a6 | 2322 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2323 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2324 | *size = ret + sechdr->sh_size; | |
2325 | return ret; | |
2326 | } | |
2327 | ||
2328 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2329 | might -- code, read-only data, read-write data, small data. Tally | |
2330 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2331 | belongs in init. */ | |
49668688 | 2332 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2333 | { |
2334 | static unsigned long const masks[][2] = { | |
2335 | /* NOTE: all executable code must be the first section | |
2336 | * in this array; otherwise modify the text_size | |
2337 | * finder in the two loops below */ | |
2338 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2339 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2340 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2341 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2342 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2343 | }; | |
2344 | unsigned int m, i; | |
2345 | ||
49668688 RR |
2346 | for (i = 0; i < info->hdr->e_shnum; i++) |
2347 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2348 | |
5e124169 | 2349 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2350 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2351 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2352 | Elf_Shdr *s = &info->sechdrs[i]; | |
2353 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2354 | |
2355 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2356 | || (s->sh_flags & masks[m][1]) | |
2357 | || s->sh_entsize != ~0UL | |
49668688 | 2358 | || strstarts(sname, ".init")) |
1da177e4 | 2359 | continue; |
7523e4dc | 2360 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2361 | pr_debug("\t%s\n", sname); |
1da177e4 | 2362 | } |
84e1c6bb MC |
2363 | switch (m) { |
2364 | case 0: /* executable */ | |
7523e4dc RR |
2365 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2366 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2367 | break; |
2368 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2369 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2370 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2371 | break; |
444d13ff JY |
2372 | case 2: /* RO after init */ |
2373 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2374 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2375 | break; | |
2376 | case 4: /* whole core */ | |
7523e4dc | 2377 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2378 | break; |
2379 | } | |
1da177e4 LT |
2380 | } |
2381 | ||
5e124169 | 2382 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2383 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2384 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2385 | Elf_Shdr *s = &info->sechdrs[i]; | |
2386 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2387 | |
2388 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2389 | || (s->sh_flags & masks[m][1]) | |
2390 | || s->sh_entsize != ~0UL | |
49668688 | 2391 | || !strstarts(sname, ".init")) |
1da177e4 | 2392 | continue; |
7523e4dc | 2393 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2394 | | INIT_OFFSET_MASK); |
5e124169 | 2395 | pr_debug("\t%s\n", sname); |
1da177e4 | 2396 | } |
84e1c6bb MC |
2397 | switch (m) { |
2398 | case 0: /* executable */ | |
7523e4dc RR |
2399 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2400 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2401 | break; |
2402 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2403 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2404 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2405 | break; |
444d13ff JY |
2406 | case 2: |
2407 | /* | |
2408 | * RO after init doesn't apply to init_layout (only | |
2409 | * core_layout), so it just takes the value of ro_size. | |
2410 | */ | |
2411 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2412 | break; | |
2413 | case 4: /* whole init */ | |
7523e4dc | 2414 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2415 | break; |
2416 | } | |
1da177e4 LT |
2417 | } |
2418 | } | |
2419 | ||
1da177e4 LT |
2420 | static void set_license(struct module *mod, const char *license) |
2421 | { | |
2422 | if (!license) | |
2423 | license = "unspecified"; | |
2424 | ||
fa3ba2e8 | 2425 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2426 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2427 | pr_warn("%s: module license '%s' taints kernel.\n", |
2428 | mod->name, license); | |
373d4d09 RR |
2429 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2430 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2431 | } |
2432 | } | |
2433 | ||
2434 | /* Parse tag=value strings from .modinfo section */ | |
2435 | static char *next_string(char *string, unsigned long *secsize) | |
2436 | { | |
2437 | /* Skip non-zero chars */ | |
2438 | while (string[0]) { | |
2439 | string++; | |
2440 | if ((*secsize)-- <= 1) | |
2441 | return NULL; | |
2442 | } | |
2443 | ||
2444 | /* Skip any zero padding. */ | |
2445 | while (!string[0]) { | |
2446 | string++; | |
2447 | if ((*secsize)-- <= 1) | |
2448 | return NULL; | |
2449 | } | |
2450 | return string; | |
2451 | } | |
2452 | ||
49668688 | 2453 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2454 | { |
2455 | char *p; | |
2456 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2457 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2458 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2459 | |
49668688 | 2460 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2461 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2462 | return p + taglen + 1; | |
2463 | } | |
2464 | return NULL; | |
2465 | } | |
2466 | ||
49668688 | 2467 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2468 | { |
2469 | struct module_attribute *attr; | |
2470 | int i; | |
2471 | ||
2472 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2473 | if (attr->setup) | |
49668688 | 2474 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2475 | } |
2476 | } | |
c988d2b2 | 2477 | |
a263f776 RR |
2478 | static void free_modinfo(struct module *mod) |
2479 | { | |
2480 | struct module_attribute *attr; | |
2481 | int i; | |
2482 | ||
2483 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2484 | if (attr->free) | |
2485 | attr->free(mod); | |
2486 | } | |
2487 | } | |
2488 | ||
1da177e4 | 2489 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2490 | |
2491 | /* lookup symbol in given range of kernel_symbols */ | |
2492 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2493 | const struct kernel_symbol *start, | |
2494 | const struct kernel_symbol *stop) | |
2495 | { | |
9d63487f AIB |
2496 | return bsearch(name, start, stop - start, |
2497 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2498 | } |
2499 | ||
ca4787b7 TA |
2500 | static int is_exported(const char *name, unsigned long value, |
2501 | const struct module *mod) | |
1da177e4 | 2502 | { |
ca4787b7 TA |
2503 | const struct kernel_symbol *ks; |
2504 | if (!mod) | |
2505 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2506 | else |
ca4787b7 TA |
2507 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2508 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2509 | } |
2510 | ||
2511 | /* As per nm */ | |
eded41c1 | 2512 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2513 | { |
eded41c1 RR |
2514 | const Elf_Shdr *sechdrs = info->sechdrs; |
2515 | ||
1da177e4 LT |
2516 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2517 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2518 | return 'v'; | |
2519 | else | |
2520 | return 'w'; | |
2521 | } | |
2522 | if (sym->st_shndx == SHN_UNDEF) | |
2523 | return 'U'; | |
e0224418 | 2524 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2525 | return 'a'; |
2526 | if (sym->st_shndx >= SHN_LORESERVE) | |
2527 | return '?'; | |
2528 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2529 | return 't'; | |
2530 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2531 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2532 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2533 | return 'r'; | |
2534 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2535 | return 'g'; | |
2536 | else | |
2537 | return 'd'; | |
2538 | } | |
2539 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2540 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2541 | return 's'; | |
2542 | else | |
2543 | return 'b'; | |
2544 | } | |
eded41c1 RR |
2545 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2546 | ".debug")) { | |
1da177e4 | 2547 | return 'n'; |
eded41c1 | 2548 | } |
1da177e4 LT |
2549 | return '?'; |
2550 | } | |
2551 | ||
4a496226 | 2552 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2553 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2554 | { |
2555 | const Elf_Shdr *sec; | |
2556 | ||
2557 | if (src->st_shndx == SHN_UNDEF | |
2558 | || src->st_shndx >= shnum | |
2559 | || !src->st_name) | |
2560 | return false; | |
2561 | ||
e0224418 MB |
2562 | #ifdef CONFIG_KALLSYMS_ALL |
2563 | if (src->st_shndx == pcpundx) | |
2564 | return true; | |
2565 | #endif | |
2566 | ||
4a496226 JB |
2567 | sec = sechdrs + src->st_shndx; |
2568 | if (!(sec->sh_flags & SHF_ALLOC) | |
2569 | #ifndef CONFIG_KALLSYMS_ALL | |
2570 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2571 | #endif | |
2572 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2573 | return false; | |
2574 | ||
2575 | return true; | |
2576 | } | |
2577 | ||
48fd1188 KC |
2578 | /* |
2579 | * We only allocate and copy the strings needed by the parts of symtab | |
2580 | * we keep. This is simple, but has the effect of making multiple | |
2581 | * copies of duplicates. We could be more sophisticated, see | |
2582 | * linux-kernel thread starting with | |
2583 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2584 | */ | |
49668688 | 2585 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2586 | { |
49668688 RR |
2587 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2588 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2589 | const Elf_Sym *src; |
54523ec7 | 2590 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2591 | |
2592 | /* Put symbol section at end of init part of module. */ | |
2593 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2594 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2595 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2596 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2597 | |
49668688 | 2598 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2599 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2600 | |
48fd1188 | 2601 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2602 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2603 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2604 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2605 | info->index.pcpu)) { | |
59ef28b1 | 2606 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2607 | ndst++; |
554bdfe5 | 2608 | } |
59ef28b1 | 2609 | } |
4a496226 JB |
2610 | |
2611 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2612 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2613 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2614 | mod->core_layout.size += strtab_size; | |
2615 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
4a496226 | 2616 | |
554bdfe5 JB |
2617 | /* Put string table section at end of init part of module. */ |
2618 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2619 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2620 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2621 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2622 | |
2623 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2624 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2625 | __alignof__(struct mod_kallsyms)); | |
2626 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2627 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
2628 | mod->init_layout.size = debug_align(mod->init_layout.size); | |
4a496226 JB |
2629 | } |
2630 | ||
8244062e RR |
2631 | /* |
2632 | * We use the full symtab and strtab which layout_symtab arranged to | |
2633 | * be appended to the init section. Later we switch to the cut-down | |
2634 | * core-only ones. | |
2635 | */ | |
811d66a0 | 2636 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2637 | { |
4a496226 JB |
2638 | unsigned int i, ndst; |
2639 | const Elf_Sym *src; | |
2640 | Elf_Sym *dst; | |
554bdfe5 | 2641 | char *s; |
eded41c1 | 2642 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2643 | |
8244062e RR |
2644 | /* Set up to point into init section. */ |
2645 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2646 | ||
2647 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2648 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2649 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2650 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1da177e4 LT |
2651 | |
2652 | /* Set types up while we still have access to sections. */ | |
8244062e RR |
2653 | for (i = 0; i < mod->kallsyms->num_symtab; i++) |
2654 | mod->kallsyms->symtab[i].st_info | |
2655 | = elf_type(&mod->kallsyms->symtab[i], info); | |
2656 | ||
2657 | /* Now populate the cut down core kallsyms for after init. */ | |
2658 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; | |
2659 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
2660 | src = mod->kallsyms->symtab; | |
2661 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1ce15ef4 | 2662 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2663 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2664 | info->index.pcpu)) { | |
59ef28b1 | 2665 | dst[ndst] = src[i]; |
8244062e RR |
2666 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2667 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2668 | KSYM_NAME_LEN) + 1; |
2669 | } | |
4a496226 | 2670 | } |
8244062e | 2671 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2672 | } |
2673 | #else | |
49668688 | 2674 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2675 | { |
2676 | } | |
3ae91c21 | 2677 | |
abbce906 | 2678 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2679 | { |
2680 | } | |
2681 | #endif /* CONFIG_KALLSYMS */ | |
2682 | ||
e9d376f0 | 2683 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2684 | { |
811d66a0 RR |
2685 | if (!debug) |
2686 | return; | |
e9d376f0 JB |
2687 | #ifdef CONFIG_DYNAMIC_DEBUG |
2688 | if (ddebug_add_module(debug, num, debug->modname)) | |
bddb12b3 AM |
2689 | pr_err("dynamic debug error adding module: %s\n", |
2690 | debug->modname); | |
e9d376f0 | 2691 | #endif |
5e458cc0 | 2692 | } |
346e15be | 2693 | |
ff49d74a YS |
2694 | static void dynamic_debug_remove(struct _ddebug *debug) |
2695 | { | |
2696 | if (debug) | |
2697 | ddebug_remove_module(debug->modname); | |
2698 | } | |
2699 | ||
74e08fcf JB |
2700 | void * __weak module_alloc(unsigned long size) |
2701 | { | |
82fab442 | 2702 | return vmalloc_exec(size); |
74e08fcf JB |
2703 | } |
2704 | ||
4f2294b6 | 2705 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2706 | static void kmemleak_load_module(const struct module *mod, |
2707 | const struct load_info *info) | |
4f2294b6 CM |
2708 | { |
2709 | unsigned int i; | |
2710 | ||
2711 | /* only scan the sections containing data */ | |
c017b4be | 2712 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2713 | |
49668688 | 2714 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2715 | /* Scan all writable sections that's not executable */ |
2716 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2717 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2718 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2719 | continue; |
2720 | ||
49668688 RR |
2721 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2722 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2723 | } |
2724 | } | |
2725 | #else | |
49668688 RR |
2726 | static inline void kmemleak_load_module(const struct module *mod, |
2727 | const struct load_info *info) | |
4f2294b6 CM |
2728 | { |
2729 | } | |
2730 | #endif | |
2731 | ||
106a4ee2 | 2732 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2733 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2734 | { |
2735 | int err = -ENOKEY; | |
34e1169d KC |
2736 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2737 | const void *mod = info->hdr; | |
caabe240 | 2738 | |
bca014ca BH |
2739 | /* |
2740 | * Require flags == 0, as a module with version information | |
2741 | * removed is no longer the module that was signed | |
2742 | */ | |
2743 | if (flags == 0 && | |
2744 | info->len > markerlen && | |
34e1169d | 2745 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2746 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2747 | info->len -= markerlen; |
2748 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2749 | } |
2750 | ||
2751 | if (!err) { | |
2752 | info->sig_ok = true; | |
2753 | return 0; | |
2754 | } | |
2755 | ||
2756 | /* Not having a signature is only an error if we're strict. */ | |
2757 | if (err == -ENOKEY && !sig_enforce) | |
2758 | err = 0; | |
2759 | ||
2760 | return err; | |
2761 | } | |
2762 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2763 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2764 | { |
2765 | return 0; | |
2766 | } | |
2767 | #endif /* !CONFIG_MODULE_SIG */ | |
2768 | ||
34e1169d KC |
2769 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2770 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2771 | { |
34e1169d KC |
2772 | if (info->len < sizeof(*(info->hdr))) |
2773 | return -ENOEXEC; | |
2774 | ||
2775 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2776 | || info->hdr->e_type != ET_REL | |
2777 | || !elf_check_arch(info->hdr) | |
2778 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2779 | return -ENOEXEC; | |
2780 | ||
2781 | if (info->hdr->e_shoff >= info->len | |
2782 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2783 | info->len - info->hdr->e_shoff)) | |
2784 | return -ENOEXEC; | |
40dd2560 | 2785 | |
34e1169d KC |
2786 | return 0; |
2787 | } | |
2788 | ||
3afe9f84 LT |
2789 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2790 | ||
2791 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2792 | { | |
2793 | do { | |
2794 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2795 | ||
2796 | if (copy_from_user(dst, usrc, n) != 0) | |
2797 | return -EFAULT; | |
2798 | cond_resched(); | |
2799 | dst += n; | |
2800 | usrc += n; | |
2801 | len -= n; | |
2802 | } while (len); | |
2803 | return 0; | |
2804 | } | |
2805 | ||
1ce15ef4 | 2806 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2807 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2808 | { |
2992ef29 JP |
2809 | if (get_modinfo(info, "livepatch")) { |
2810 | mod->klp = true; | |
2811 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
2812 | } | |
1ce15ef4 JY |
2813 | |
2814 | return 0; | |
2815 | } | |
2816 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2817 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2818 | { |
2819 | if (get_modinfo(info, "livepatch")) { | |
2820 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2821 | mod->name); | |
2822 | return -ENOEXEC; | |
2823 | } | |
2824 | ||
2825 | return 0; | |
2826 | } | |
2827 | #endif /* CONFIG_LIVEPATCH */ | |
2828 | ||
34e1169d KC |
2829 | /* Sets info->hdr and info->len. */ |
2830 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2831 | struct load_info *info) | |
40dd2560 RR |
2832 | { |
2833 | int err; | |
40dd2560 | 2834 | |
34e1169d KC |
2835 | info->len = len; |
2836 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2837 | return -ENOEXEC; |
2838 | ||
a1db7420 | 2839 | err = security_kernel_read_file(NULL, READING_MODULE); |
2e72d51b KC |
2840 | if (err) |
2841 | return err; | |
2842 | ||
40dd2560 | 2843 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d KS |
2844 | info->hdr = __vmalloc(info->len, |
2845 | GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN, PAGE_KERNEL); | |
34e1169d | 2846 | if (!info->hdr) |
40dd2560 RR |
2847 | return -ENOMEM; |
2848 | ||
3afe9f84 | 2849 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2850 | vfree(info->hdr); |
2851 | return -EFAULT; | |
40dd2560 RR |
2852 | } |
2853 | ||
34e1169d KC |
2854 | return 0; |
2855 | } | |
2856 | ||
d913188c RR |
2857 | static void free_copy(struct load_info *info) |
2858 | { | |
d913188c RR |
2859 | vfree(info->hdr); |
2860 | } | |
2861 | ||
2f3238ae | 2862 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2863 | { |
2864 | unsigned int i; | |
2865 | ||
2866 | /* This should always be true, but let's be sure. */ | |
2867 | info->sechdrs[0].sh_addr = 0; | |
2868 | ||
2869 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2870 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2871 | if (shdr->sh_type != SHT_NOBITS | |
2872 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2873 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2874 | return -ENOEXEC; |
2875 | } | |
2876 | ||
2877 | /* Mark all sections sh_addr with their address in the | |
2878 | temporary image. */ | |
2879 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2880 | ||
2881 | #ifndef CONFIG_MODULE_UNLOAD | |
2882 | /* Don't load .exit sections */ | |
2883 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2884 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2885 | #endif | |
8b5f61a7 | 2886 | } |
d6df72a0 RR |
2887 | |
2888 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2889 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2890 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2891 | else | |
2892 | info->index.vers = find_sec(info, "__versions"); | |
49668688 | 2893 | info->index.info = find_sec(info, ".modinfo"); |
d6df72a0 RR |
2894 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2895 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2896 | return 0; |
2897 | } | |
2898 | ||
3264d3f9 LT |
2899 | /* |
2900 | * Set up our basic convenience variables (pointers to section headers, | |
2901 | * search for module section index etc), and do some basic section | |
2902 | * verification. | |
2903 | * | |
2904 | * Return the temporary module pointer (we'll replace it with the final | |
2905 | * one when we move the module sections around). | |
2906 | */ | |
2f3238ae | 2907 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2908 | { |
2909 | unsigned int i; | |
8b5f61a7 | 2910 | int err; |
3264d3f9 LT |
2911 | struct module *mod; |
2912 | ||
2913 | /* Set up the convenience variables */ | |
2914 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2915 | info->secstrings = (void *)info->hdr |
2916 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2917 | |
2f3238ae | 2918 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2919 | if (err) |
2920 | return ERR_PTR(err); | |
3264d3f9 | 2921 | |
8b5f61a7 RR |
2922 | /* Find internal symbols and strings. */ |
2923 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2924 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2925 | info->index.sym = i; | |
2926 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2927 | info->strtab = (char *)info->hdr |
2928 | + info->sechdrs[info->index.str].sh_offset; | |
2929 | break; | |
3264d3f9 | 2930 | } |
3264d3f9 LT |
2931 | } |
2932 | ||
49668688 | 2933 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2934 | if (!info->index.mod) { |
bddb12b3 | 2935 | pr_warn("No module found in object\n"); |
3264d3f9 LT |
2936 | return ERR_PTR(-ENOEXEC); |
2937 | } | |
2938 | /* This is temporary: point mod into copy of data. */ | |
2939 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2940 | ||
2941 | if (info->index.sym == 0) { | |
bddb12b3 | 2942 | pr_warn("%s: module has no symbols (stripped?)\n", mod->name); |
3264d3f9 LT |
2943 | return ERR_PTR(-ENOEXEC); |
2944 | } | |
2945 | ||
49668688 | 2946 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2947 | |
3264d3f9 LT |
2948 | /* Check module struct version now, before we try to use module. */ |
2949 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2950 | return ERR_PTR(-ENOEXEC); | |
2951 | ||
2952 | return mod; | |
3264d3f9 LT |
2953 | } |
2954 | ||
2f3238ae | 2955 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2956 | { |
49668688 | 2957 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2958 | int err; |
2959 | ||
2f3238ae RR |
2960 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2961 | modmagic = NULL; | |
2962 | ||
40dd2560 RR |
2963 | /* This is allowed: modprobe --force will invalidate it. */ |
2964 | if (!modmagic) { | |
2965 | err = try_to_force_load(mod, "bad vermagic"); | |
2966 | if (err) | |
2967 | return err; | |
49668688 | 2968 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 2969 | pr_err("%s: version magic '%s' should be '%s'\n", |
40dd2560 RR |
2970 | mod->name, modmagic, vermagic); |
2971 | return -ENOEXEC; | |
2972 | } | |
2973 | ||
3205c36c LP |
2974 | if (!get_modinfo(info, "intree")) { |
2975 | if (!test_taint(TAINT_OOT_MODULE)) | |
2976 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
2977 | mod->name); | |
373d4d09 | 2978 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 2979 | } |
2449b8ba | 2980 | |
49668688 | 2981 | if (get_modinfo(info, "staging")) { |
373d4d09 | 2982 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
2983 | pr_warn("%s: module is from the staging directory, the quality " |
2984 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 2985 | } |
22e268eb | 2986 | |
2992ef29 | 2987 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
2988 | if (err) |
2989 | return err; | |
2990 | ||
22e268eb | 2991 | /* Set up license info based on the info section */ |
49668688 | 2992 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2993 | |
40dd2560 RR |
2994 | return 0; |
2995 | } | |
2996 | ||
eb3057df | 2997 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2998 | { |
49668688 | 2999 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3000 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3001 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3002 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3003 | mod->crcs = section_addr(info, "__kcrctab"); |
3004 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3005 | sizeof(*mod->gpl_syms), |
3006 | &mod->num_gpl_syms); | |
49668688 RR |
3007 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3008 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3009 | "__ksymtab_gpl_future", |
3010 | sizeof(*mod->gpl_future_syms), | |
3011 | &mod->num_gpl_future_syms); | |
49668688 | 3012 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3013 | |
3014 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3015 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3016 | sizeof(*mod->unused_syms), |
3017 | &mod->num_unused_syms); | |
49668688 RR |
3018 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3019 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3020 | sizeof(*mod->unused_gpl_syms), |
3021 | &mod->num_unused_gpl_syms); | |
49668688 | 3022 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3023 | #endif |
3024 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3025 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3026 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3027 | if (!mod->ctors) |
3028 | mod->ctors = section_objs(info, ".init_array", | |
3029 | sizeof(*mod->ctors), &mod->num_ctors); | |
3030 | else if (find_sec(info, ".init_array")) { | |
3031 | /* | |
3032 | * This shouldn't happen with same compiler and binutils | |
3033 | * building all parts of the module. | |
3034 | */ | |
6da0b565 | 3035 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3036 | mod->name); |
3037 | return -EINVAL; | |
3038 | } | |
f91a13bb LT |
3039 | #endif |
3040 | ||
3041 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3042 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3043 | sizeof(*mod->tracepoints_ptrs), | |
3044 | &mod->num_tracepoints); | |
f91a13bb | 3045 | #endif |
bf5438fc JB |
3046 | #ifdef HAVE_JUMP_LABEL |
3047 | mod->jump_entries = section_objs(info, "__jump_table", | |
3048 | sizeof(*mod->jump_entries), | |
3049 | &mod->num_jump_entries); | |
3050 | #endif | |
f91a13bb | 3051 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3052 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3053 | sizeof(*mod->trace_events), |
3054 | &mod->num_trace_events); | |
3673b8e4 SRRH |
3055 | mod->trace_enums = section_objs(info, "_ftrace_enum_map", |
3056 | sizeof(*mod->trace_enums), | |
3057 | &mod->num_trace_enums); | |
f91a13bb | 3058 | #endif |
13b9b6e7 SR |
3059 | #ifdef CONFIG_TRACING |
3060 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3061 | sizeof(*mod->trace_bprintk_fmt_start), | |
3062 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3063 | #endif |
f91a13bb LT |
3064 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3065 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3066 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3067 | sizeof(*mod->ftrace_callsites), |
3068 | &mod->num_ftrace_callsites); | |
3069 | #endif | |
22e268eb | 3070 | |
811d66a0 RR |
3071 | mod->extable = section_objs(info, "__ex_table", |
3072 | sizeof(*mod->extable), &mod->num_exentries); | |
3073 | ||
49668688 | 3074 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3075 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3076 | |
3077 | info->debug = section_objs(info, "__verbose", | |
3078 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3079 | |
3080 | return 0; | |
f91a13bb LT |
3081 | } |
3082 | ||
49668688 | 3083 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3084 | { |
3085 | int i; | |
3086 | void *ptr; | |
3087 | ||
3088 | /* Do the allocs. */ | |
7523e4dc | 3089 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3090 | /* |
3091 | * The pointer to this block is stored in the module structure | |
3092 | * which is inside the block. Just mark it as not being a | |
3093 | * leak. | |
3094 | */ | |
3095 | kmemleak_not_leak(ptr); | |
3096 | if (!ptr) | |
d913188c | 3097 | return -ENOMEM; |
65b8a9b4 | 3098 | |
7523e4dc RR |
3099 | memset(ptr, 0, mod->core_layout.size); |
3100 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3101 | |
7523e4dc RR |
3102 | if (mod->init_layout.size) { |
3103 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3104 | /* |
3105 | * The pointer to this block is stored in the module structure | |
3106 | * which is inside the block. This block doesn't need to be | |
3107 | * scanned as it contains data and code that will be freed | |
3108 | * after the module is initialized. | |
3109 | */ | |
3110 | kmemleak_ignore(ptr); | |
3111 | if (!ptr) { | |
7523e4dc | 3112 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3113 | return -ENOMEM; |
3114 | } | |
7523e4dc RR |
3115 | memset(ptr, 0, mod->init_layout.size); |
3116 | mod->init_layout.base = ptr; | |
82fab442 | 3117 | } else |
7523e4dc | 3118 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3119 | |
3120 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3121 | pr_debug("final section addresses:\n"); |
49668688 | 3122 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3123 | void *dest; |
49668688 | 3124 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3125 | |
49668688 | 3126 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3127 | continue; |
3128 | ||
49668688 | 3129 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3130 | dest = mod->init_layout.base |
49668688 | 3131 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3132 | else |
7523e4dc | 3133 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3134 | |
49668688 RR |
3135 | if (shdr->sh_type != SHT_NOBITS) |
3136 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3137 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3138 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3139 | pr_debug("\t0x%lx %s\n", |
3140 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3141 | } |
d913188c RR |
3142 | |
3143 | return 0; | |
65b8a9b4 LT |
3144 | } |
3145 | ||
49668688 | 3146 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3147 | { |
3205c36c LP |
3148 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3149 | ||
22e268eb RR |
3150 | /* |
3151 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3152 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3153 | * using GPL-only symbols it needs. | |
3154 | */ | |
3155 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3156 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3157 | |
3158 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3159 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3160 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3161 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3162 | |
c99af375 MG |
3163 | /* lve claims to be GPL but upstream won't provide source */ |
3164 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3165 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3166 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3167 | |
3205c36c LP |
3168 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3169 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3170 | ||
22e268eb RR |
3171 | #ifdef CONFIG_MODVERSIONS |
3172 | if ((mod->num_syms && !mod->crcs) | |
3173 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3174 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3175 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3176 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3177 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3178 | #endif | |
3179 | ) { | |
3180 | return try_to_force_load(mod, | |
3181 | "no versions for exported symbols"); | |
3182 | } | |
3183 | #endif | |
3184 | return 0; | |
3185 | } | |
3186 | ||
3187 | static void flush_module_icache(const struct module *mod) | |
3188 | { | |
3189 | mm_segment_t old_fs; | |
3190 | ||
3191 | /* flush the icache in correct context */ | |
3192 | old_fs = get_fs(); | |
3193 | set_fs(KERNEL_DS); | |
3194 | ||
3195 | /* | |
3196 | * Flush the instruction cache, since we've played with text. | |
3197 | * Do it before processing of module parameters, so the module | |
3198 | * can provide parameter accessor functions of its own. | |
3199 | */ | |
7523e4dc RR |
3200 | if (mod->init_layout.base) |
3201 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3202 | (unsigned long)mod->init_layout.base | |
3203 | + mod->init_layout.size); | |
3204 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3205 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3206 | |
3207 | set_fs(old_fs); | |
3208 | } | |
3209 | ||
74e08fcf JB |
3210 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3211 | Elf_Shdr *sechdrs, | |
3212 | char *secstrings, | |
3213 | struct module *mod) | |
3214 | { | |
3215 | return 0; | |
3216 | } | |
3217 | ||
be7de5f9 PB |
3218 | /* module_blacklist is a comma-separated list of module names */ |
3219 | static char *module_blacklist; | |
3220 | static bool blacklisted(char *module_name) | |
3221 | { | |
3222 | const char *p; | |
3223 | size_t len; | |
3224 | ||
3225 | if (!module_blacklist) | |
3226 | return false; | |
3227 | ||
3228 | for (p = module_blacklist; *p; p += len) { | |
3229 | len = strcspn(p, ","); | |
3230 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3231 | return true; | |
3232 | if (p[len] == ',') | |
3233 | len++; | |
3234 | } | |
3235 | return false; | |
3236 | } | |
3237 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3238 | ||
2f3238ae | 3239 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3240 | { |
d913188c | 3241 | /* Module within temporary copy. */ |
1da177e4 | 3242 | struct module *mod; |
444d13ff | 3243 | unsigned int ndx; |
d913188c | 3244 | int err; |
3ae91c21 | 3245 | |
2f3238ae | 3246 | mod = setup_load_info(info, flags); |
d913188c RR |
3247 | if (IS_ERR(mod)) |
3248 | return mod; | |
1da177e4 | 3249 | |
be7de5f9 PB |
3250 | if (blacklisted(mod->name)) |
3251 | return ERR_PTR(-EPERM); | |
3252 | ||
2f3238ae | 3253 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
3254 | if (err) |
3255 | return ERR_PTR(err); | |
1da177e4 | 3256 | |
1da177e4 | 3257 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
3258 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
3259 | info->secstrings, mod); | |
1da177e4 | 3260 | if (err < 0) |
8d8022e8 | 3261 | return ERR_PTR(err); |
1da177e4 | 3262 | |
8d8022e8 RR |
3263 | /* We will do a special allocation for per-cpu sections later. */ |
3264 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3265 | |
444d13ff JY |
3266 | /* |
3267 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3268 | * layout_sections() can put it in the right place. | |
3269 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3270 | */ | |
3271 | ndx = find_sec(info, ".data..ro_after_init"); | |
3272 | if (ndx) | |
3273 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3274 | ||
1da177e4 LT |
3275 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3276 | this is done generically; there doesn't appear to be any | |
3277 | special cases for the architectures. */ | |
49668688 | 3278 | layout_sections(mod, info); |
49668688 | 3279 | layout_symtab(mod, info); |
1da177e4 | 3280 | |
65b8a9b4 | 3281 | /* Allocate and move to the final place */ |
49668688 | 3282 | err = move_module(mod, info); |
d913188c | 3283 | if (err) |
8d8022e8 | 3284 | return ERR_PTR(err); |
d913188c RR |
3285 | |
3286 | /* Module has been copied to its final place now: return it. */ | |
3287 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3288 | kmemleak_load_module(mod, info); |
d913188c | 3289 | return mod; |
d913188c RR |
3290 | } |
3291 | ||
3292 | /* mod is no longer valid after this! */ | |
3293 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3294 | { | |
d913188c | 3295 | percpu_modfree(mod); |
d453cded | 3296 | module_arch_freeing_init(mod); |
7523e4dc RR |
3297 | module_memfree(mod->init_layout.base); |
3298 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3299 | } |
3300 | ||
74e08fcf JB |
3301 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3302 | const Elf_Shdr *sechdrs, | |
3303 | struct module *me) | |
3304 | { | |
3305 | return 0; | |
3306 | } | |
3307 | ||
811d66a0 RR |
3308 | static int post_relocation(struct module *mod, const struct load_info *info) |
3309 | { | |
51f3d0f4 | 3310 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3311 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3312 | ||
3313 | /* Copy relocated percpu area over. */ | |
3314 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3315 | info->sechdrs[info->index.pcpu].sh_size); | |
3316 | ||
51f3d0f4 | 3317 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3318 | add_kallsyms(mod, info); |
3319 | ||
3320 | /* Arch-specific module finalizing. */ | |
3321 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3322 | } | |
3323 | ||
9bb9c3be RR |
3324 | /* Is this module of this name done loading? No locks held. */ |
3325 | static bool finished_loading(const char *name) | |
3326 | { | |
3327 | struct module *mod; | |
3328 | bool ret; | |
3329 | ||
9cc019b8 PZ |
3330 | /* |
3331 | * The module_mutex should not be a heavily contended lock; | |
3332 | * if we get the occasional sleep here, we'll go an extra iteration | |
3333 | * in the wait_event_interruptible(), which is harmless. | |
3334 | */ | |
3335 | sched_annotate_sleep(); | |
9bb9c3be | 3336 | mutex_lock(&module_mutex); |
4f6de4d5 | 3337 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3338 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3339 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3340 | mutex_unlock(&module_mutex); |
3341 | ||
3342 | return ret; | |
3343 | } | |
3344 | ||
34e1169d KC |
3345 | /* Call module constructors. */ |
3346 | static void do_mod_ctors(struct module *mod) | |
3347 | { | |
3348 | #ifdef CONFIG_CONSTRUCTORS | |
3349 | unsigned long i; | |
3350 | ||
3351 | for (i = 0; i < mod->num_ctors; i++) | |
3352 | mod->ctors[i](); | |
3353 | #endif | |
3354 | } | |
3355 | ||
c7496379 RR |
3356 | /* For freeing module_init on success, in case kallsyms traversing */ |
3357 | struct mod_initfree { | |
3358 | struct rcu_head rcu; | |
3359 | void *module_init; | |
3360 | }; | |
3361 | ||
3362 | static void do_free_init(struct rcu_head *head) | |
3363 | { | |
3364 | struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); | |
3365 | module_memfree(m->module_init); | |
3366 | kfree(m); | |
3367 | } | |
3368 | ||
be02a186 JK |
3369 | /* |
3370 | * This is where the real work happens. | |
3371 | * | |
3372 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3373 | * helper command 'lx-symbols'. | |
3374 | */ | |
3375 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3376 | { |
3377 | int ret = 0; | |
c7496379 RR |
3378 | struct mod_initfree *freeinit; |
3379 | ||
3380 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3381 | if (!freeinit) { | |
3382 | ret = -ENOMEM; | |
3383 | goto fail; | |
3384 | } | |
7523e4dc | 3385 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3386 | |
774a1221 TH |
3387 | /* |
3388 | * We want to find out whether @mod uses async during init. Clear | |
3389 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3390 | */ | |
3391 | current->flags &= ~PF_USED_ASYNC; | |
3392 | ||
34e1169d KC |
3393 | do_mod_ctors(mod); |
3394 | /* Start the module */ | |
3395 | if (mod->init != NULL) | |
3396 | ret = do_one_initcall(mod->init); | |
3397 | if (ret < 0) { | |
c7496379 | 3398 | goto fail_free_freeinit; |
34e1169d KC |
3399 | } |
3400 | if (ret > 0) { | |
bddb12b3 AM |
3401 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3402 | "follow 0/-E convention\n" | |
3403 | "%s: loading module anyway...\n", | |
3404 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3405 | dump_stack(); |
3406 | } | |
3407 | ||
3408 | /* Now it's a first class citizen! */ | |
3409 | mod->state = MODULE_STATE_LIVE; | |
3410 | blocking_notifier_call_chain(&module_notify_list, | |
3411 | MODULE_STATE_LIVE, mod); | |
3412 | ||
774a1221 TH |
3413 | /* |
3414 | * We need to finish all async code before the module init sequence | |
3415 | * is done. This has potential to deadlock. For example, a newly | |
3416 | * detected block device can trigger request_module() of the | |
3417 | * default iosched from async probing task. Once userland helper | |
3418 | * reaches here, async_synchronize_full() will wait on the async | |
3419 | * task waiting on request_module() and deadlock. | |
3420 | * | |
3421 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3422 | * iff module init queued any async jobs. This isn't a full | |
3423 | * solution as it will deadlock the same if module loading from | |
3424 | * async jobs nests more than once; however, due to the various | |
3425 | * constraints, this hack seems to be the best option for now. | |
3426 | * Please refer to the following thread for details. | |
3427 | * | |
3428 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3429 | */ | |
f2411da7 | 3430 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3431 | async_synchronize_full(); |
34e1169d KC |
3432 | |
3433 | mutex_lock(&module_mutex); | |
3434 | /* Drop initial reference. */ | |
3435 | module_put(mod); | |
3436 | trim_init_extable(mod); | |
3437 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3438 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3439 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3440 | #endif |
444d13ff | 3441 | module_enable_ro(mod, true); |
93c2e105 | 3442 | mod_tree_remove_init(mod); |
85c898db | 3443 | disable_ro_nx(&mod->init_layout); |
d453cded | 3444 | module_arch_freeing_init(mod); |
7523e4dc RR |
3445 | mod->init_layout.base = NULL; |
3446 | mod->init_layout.size = 0; | |
3447 | mod->init_layout.ro_size = 0; | |
444d13ff | 3448 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3449 | mod->init_layout.text_size = 0; |
c7496379 RR |
3450 | /* |
3451 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be PZ |
3452 | * walking this with preempt disabled. In all the failure paths, we |
3453 | * call synchronize_sched(), but we don't want to slow down the success | |
3454 | * path, so use actual RCU here. | |
c7496379 | 3455 | */ |
0be964be | 3456 | call_rcu_sched(&freeinit->rcu, do_free_init); |
34e1169d KC |
3457 | mutex_unlock(&module_mutex); |
3458 | wake_up_all(&module_wq); | |
3459 | ||
3460 | return 0; | |
c7496379 RR |
3461 | |
3462 | fail_free_freeinit: | |
3463 | kfree(freeinit); | |
3464 | fail: | |
3465 | /* Try to protect us from buggy refcounters. */ | |
3466 | mod->state = MODULE_STATE_GOING; | |
3467 | synchronize_sched(); | |
3468 | module_put(mod); | |
3469 | blocking_notifier_call_chain(&module_notify_list, | |
3470 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3471 | klp_module_going(mod); |
7dcd182b | 3472 | ftrace_release_mod(mod); |
c7496379 RR |
3473 | free_module(mod); |
3474 | wake_up_all(&module_wq); | |
3475 | return ret; | |
34e1169d KC |
3476 | } |
3477 | ||
3478 | static int may_init_module(void) | |
3479 | { | |
3480 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3481 | return -EPERM; | |
3482 | ||
3483 | return 0; | |
3484 | } | |
3485 | ||
a3535c7e RR |
3486 | /* |
3487 | * We try to place it in the list now to make sure it's unique before | |
3488 | * we dedicate too many resources. In particular, temporary percpu | |
3489 | * memory exhaustion. | |
3490 | */ | |
3491 | static int add_unformed_module(struct module *mod) | |
3492 | { | |
3493 | int err; | |
3494 | struct module *old; | |
3495 | ||
3496 | mod->state = MODULE_STATE_UNFORMED; | |
3497 | ||
3498 | again: | |
3499 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3500 | old = find_module_all(mod->name, strlen(mod->name), true); |
3501 | if (old != NULL) { | |
a3535c7e RR |
3502 | if (old->state == MODULE_STATE_COMING |
3503 | || old->state == MODULE_STATE_UNFORMED) { | |
3504 | /* Wait in case it fails to load. */ | |
3505 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3506 | err = wait_event_interruptible(module_wq, |
3507 | finished_loading(mod->name)); | |
a3535c7e RR |
3508 | if (err) |
3509 | goto out_unlocked; | |
3510 | goto again; | |
3511 | } | |
3512 | err = -EEXIST; | |
3513 | goto out; | |
3514 | } | |
4f666546 | 3515 | mod_update_bounds(mod); |
a3535c7e | 3516 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3517 | mod_tree_insert(mod); |
a3535c7e RR |
3518 | err = 0; |
3519 | ||
3520 | out: | |
3521 | mutex_unlock(&module_mutex); | |
3522 | out_unlocked: | |
3523 | return err; | |
3524 | } | |
3525 | ||
3526 | static int complete_formation(struct module *mod, struct load_info *info) | |
3527 | { | |
3528 | int err; | |
3529 | ||
3530 | mutex_lock(&module_mutex); | |
3531 | ||
3532 | /* Find duplicate symbols (must be called under lock). */ | |
3533 | err = verify_export_symbols(mod); | |
3534 | if (err < 0) | |
3535 | goto out; | |
3536 | ||
3537 | /* This relies on module_mutex for list integrity. */ | |
3538 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3539 | ||
444d13ff | 3540 | module_enable_ro(mod, false); |
85c898db | 3541 | module_enable_nx(mod); |
4982223e | 3542 | |
a3535c7e RR |
3543 | /* Mark state as coming so strong_try_module_get() ignores us, |
3544 | * but kallsyms etc. can see us. */ | |
3545 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3546 | mutex_unlock(&module_mutex); |
3547 | ||
4982223e | 3548 | return 0; |
a3535c7e RR |
3549 | |
3550 | out: | |
3551 | mutex_unlock(&module_mutex); | |
3552 | return err; | |
3553 | } | |
3554 | ||
4c973d16 JY |
3555 | static int prepare_coming_module(struct module *mod) |
3556 | { | |
7e545d6e JY |
3557 | int err; |
3558 | ||
4c973d16 | 3559 | ftrace_module_enable(mod); |
7e545d6e JY |
3560 | err = klp_module_coming(mod); |
3561 | if (err) | |
3562 | return err; | |
3563 | ||
4c973d16 JY |
3564 | blocking_notifier_call_chain(&module_notify_list, |
3565 | MODULE_STATE_COMING, mod); | |
3566 | return 0; | |
3567 | } | |
3568 | ||
ecc86170 LR |
3569 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3570 | void *arg) | |
54041d8a | 3571 | { |
f2411da7 LR |
3572 | struct module *mod = arg; |
3573 | int ret; | |
3574 | ||
3575 | if (strcmp(param, "async_probe") == 0) { | |
3576 | mod->async_probe_requested = true; | |
3577 | return 0; | |
3578 | } | |
3579 | ||
6da0b565 | 3580 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3581 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3582 | if (ret != 0) |
3583 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3584 | return 0; |
3585 | } | |
3586 | ||
d913188c RR |
3587 | /* Allocate and load the module: note that size of section 0 is always |
3588 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3589 | static int load_module(struct load_info *info, const char __user *uargs, |
3590 | int flags) | |
d913188c | 3591 | { |
a3535c7e | 3592 | struct module *mod; |
d913188c | 3593 | long err; |
51e158c1 | 3594 | char *after_dashes; |
d913188c | 3595 | |
bca014ca | 3596 | err = module_sig_check(info, flags); |
34e1169d KC |
3597 | if (err) |
3598 | goto free_copy; | |
d913188c | 3599 | |
34e1169d | 3600 | err = elf_header_check(info); |
d913188c | 3601 | if (err) |
34e1169d | 3602 | goto free_copy; |
d913188c RR |
3603 | |
3604 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3605 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3606 | if (IS_ERR(mod)) { |
3607 | err = PTR_ERR(mod); | |
d913188c | 3608 | goto free_copy; |
1da177e4 | 3609 | } |
1da177e4 | 3610 | |
a3535c7e RR |
3611 | /* Reserve our place in the list. */ |
3612 | err = add_unformed_module(mod); | |
3613 | if (err) | |
1fb9341a | 3614 | goto free_module; |
1fb9341a | 3615 | |
106a4ee2 | 3616 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3617 | mod->sig_ok = info->sig_ok; |
64748a2c | 3618 | if (!mod->sig_ok) { |
bddb12b3 | 3619 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3620 | "and/or required key missing - tainting " |
bddb12b3 | 3621 | "kernel\n", mod->name); |
66cc69e3 | 3622 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3623 | } |
106a4ee2 RR |
3624 | #endif |
3625 | ||
8d8022e8 | 3626 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3627 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3628 | if (err) |
3629 | goto unlink_mod; | |
3630 | ||
49668688 | 3631 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3632 | err = module_unload_init(mod); |
3633 | if (err) | |
1fb9341a | 3634 | goto unlink_mod; |
1da177e4 | 3635 | |
cf2fde7b | 3636 | init_param_lock(mod); |
b51d23e4 | 3637 | |
22e268eb RR |
3638 | /* Now we've got everything in the final locations, we can |
3639 | * find optional sections. */ | |
eb3057df FH |
3640 | err = find_module_sections(mod, info); |
3641 | if (err) | |
3642 | goto free_unload; | |
9b37ccfc | 3643 | |
49668688 | 3644 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3645 | if (err) |
3646 | goto free_unload; | |
9841d61d | 3647 | |
c988d2b2 | 3648 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3649 | setup_modinfo(mod, info); |
c988d2b2 | 3650 | |
1da177e4 | 3651 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3652 | err = simplify_symbols(mod, info); |
1da177e4 | 3653 | if (err < 0) |
d913188c | 3654 | goto free_modinfo; |
1da177e4 | 3655 | |
34e1169d | 3656 | err = apply_relocations(mod, info); |
22e268eb | 3657 | if (err < 0) |
d913188c | 3658 | goto free_modinfo; |
1da177e4 | 3659 | |
34e1169d | 3660 | err = post_relocation(mod, info); |
1da177e4 | 3661 | if (err < 0) |
d913188c | 3662 | goto free_modinfo; |
1da177e4 | 3663 | |
22e268eb | 3664 | flush_module_icache(mod); |
378bac82 | 3665 | |
6526c534 RR |
3666 | /* Now copy in args */ |
3667 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3668 | if (IS_ERR(mod->args)) { | |
3669 | err = PTR_ERR(mod->args); | |
3670 | goto free_arch_cleanup; | |
3671 | } | |
8d3b33f6 | 3672 | |
34e1169d | 3673 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3674 | |
a949ae56 SRRH |
3675 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3676 | ftrace_module_init(mod); | |
3677 | ||
a3535c7e RR |
3678 | /* Finally it's fully formed, ready to start executing. */ |
3679 | err = complete_formation(mod, info); | |
3680 | if (err) | |
1fb9341a | 3681 | goto ddebug_cleanup; |
be593f4c | 3682 | |
4c973d16 JY |
3683 | err = prepare_coming_module(mod); |
3684 | if (err) | |
3685 | goto bug_cleanup; | |
3686 | ||
51f3d0f4 | 3687 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3688 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3689 | -32768, 32767, mod, |
ecc86170 | 3690 | unknown_module_param_cb); |
51e158c1 RR |
3691 | if (IS_ERR(after_dashes)) { |
3692 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3693 | goto coming_cleanup; |
51e158c1 RR |
3694 | } else if (after_dashes) { |
3695 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3696 | mod->name, after_dashes); | |
3697 | } | |
1da177e4 | 3698 | |
51f3d0f4 | 3699 | /* Link in to syfs. */ |
34e1169d | 3700 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3701 | if (err < 0) |
4c973d16 | 3702 | goto coming_cleanup; |
80a3d1bb | 3703 | |
1ce15ef4 JY |
3704 | if (is_livepatch_module(mod)) { |
3705 | err = copy_module_elf(mod, info); | |
3706 | if (err < 0) | |
3707 | goto sysfs_cleanup; | |
3708 | } | |
3709 | ||
48fd1188 | 3710 | /* Get rid of temporary copy. */ |
34e1169d | 3711 | free_copy(info); |
1da177e4 LT |
3712 | |
3713 | /* Done! */ | |
51f3d0f4 | 3714 | trace_module_load(mod); |
34e1169d KC |
3715 | |
3716 | return do_init_module(mod); | |
1da177e4 | 3717 | |
1ce15ef4 JY |
3718 | sysfs_cleanup: |
3719 | mod_sysfs_teardown(mod); | |
4c973d16 | 3720 | coming_cleanup: |
885a78d4 | 3721 | mod->state = MODULE_STATE_GOING; |
4c973d16 JY |
3722 | blocking_notifier_call_chain(&module_notify_list, |
3723 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3724 | klp_module_going(mod); |
1fb9341a RR |
3725 | bug_cleanup: |
3726 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3727 | mutex_lock(&module_mutex); |
5336377d | 3728 | module_bug_cleanup(mod); |
ee61abb3 | 3729 | mutex_unlock(&module_mutex); |
ff7e0055 AL |
3730 | |
3731 | /* we can't deallocate the module until we clear memory protection */ | |
85c898db RR |
3732 | module_disable_ro(mod); |
3733 | module_disable_nx(mod); | |
ff7e0055 | 3734 | |
a3535c7e | 3735 | ddebug_cleanup: |
1fb9341a | 3736 | dynamic_debug_remove(info->debug); |
e91defa2 | 3737 | synchronize_sched(); |
6526c534 RR |
3738 | kfree(mod->args); |
3739 | free_arch_cleanup: | |
1da177e4 | 3740 | module_arch_cleanup(mod); |
d913188c | 3741 | free_modinfo: |
a263f776 | 3742 | free_modinfo(mod); |
22e268eb | 3743 | free_unload: |
1da177e4 | 3744 | module_unload_free(mod); |
1fb9341a RR |
3745 | unlink_mod: |
3746 | mutex_lock(&module_mutex); | |
3747 | /* Unlink carefully: kallsyms could be walking list. */ | |
3748 | list_del_rcu(&mod->list); | |
758556bd | 3749 | mod_tree_remove(mod); |
1fb9341a | 3750 | wake_up_all(&module_wq); |
0be964be PZ |
3751 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
3752 | synchronize_sched(); | |
1fb9341a | 3753 | mutex_unlock(&module_mutex); |
d913188c | 3754 | free_module: |
049fb9bd SRRH |
3755 | /* |
3756 | * Ftrace needs to clean up what it initialized. | |
3757 | * This does nothing if ftrace_module_init() wasn't called, | |
3758 | * but it must be called outside of module_mutex. | |
3759 | */ | |
3760 | ftrace_release_mod(mod); | |
35a9393c | 3761 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3762 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3763 | |
34e1169d | 3764 | module_deallocate(mod, info); |
d913188c | 3765 | free_copy: |
34e1169d KC |
3766 | free_copy(info); |
3767 | return err; | |
b99b87f7 PO |
3768 | } |
3769 | ||
17da2bd9 HC |
3770 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3771 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3772 | { |
34e1169d KC |
3773 | int err; |
3774 | struct load_info info = { }; | |
1da177e4 | 3775 | |
34e1169d KC |
3776 | err = may_init_module(); |
3777 | if (err) | |
3778 | return err; | |
1da177e4 | 3779 | |
34e1169d KC |
3780 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3781 | umod, len, uargs); | |
1da177e4 | 3782 | |
34e1169d KC |
3783 | err = copy_module_from_user(umod, len, &info); |
3784 | if (err) | |
3785 | return err; | |
1da177e4 | 3786 | |
2f3238ae | 3787 | return load_module(&info, uargs, 0); |
34e1169d | 3788 | } |
94462ad3 | 3789 | |
2f3238ae | 3790 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3791 | { |
34e1169d | 3792 | struct load_info info = { }; |
a1db7420 MZ |
3793 | loff_t size; |
3794 | void *hdr; | |
3795 | int err; | |
94462ad3 | 3796 | |
34e1169d KC |
3797 | err = may_init_module(); |
3798 | if (err) | |
3799 | return err; | |
1da177e4 | 3800 | |
2f3238ae | 3801 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3802 | |
2f3238ae RR |
3803 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3804 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3805 | return -EINVAL; | |
d6de2c80 | 3806 | |
a1db7420 MZ |
3807 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
3808 | READING_MODULE); | |
34e1169d KC |
3809 | if (err) |
3810 | return err; | |
a1db7420 MZ |
3811 | info.hdr = hdr; |
3812 | info.len = size; | |
1da177e4 | 3813 | |
2f3238ae | 3814 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3815 | } |
3816 | ||
3817 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3818 | { | |
3819 | return ((void *)addr >= start && (void *)addr < start + size); | |
3820 | } | |
3821 | ||
3822 | #ifdef CONFIG_KALLSYMS | |
3823 | /* | |
3824 | * This ignores the intensely annoying "mapping symbols" found | |
3825 | * in ARM ELF files: $a, $t and $d. | |
3826 | */ | |
3827 | static inline int is_arm_mapping_symbol(const char *str) | |
3828 | { | |
2e3a10a1 RK |
3829 | if (str[0] == '.' && str[1] == 'L') |
3830 | return true; | |
6c34f1f5 | 3831 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3832 | && (str[2] == '\0' || str[2] == '.'); |
3833 | } | |
3834 | ||
8244062e | 3835 | static const char *symname(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 3836 | { |
8244062e | 3837 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
3838 | } |
3839 | ||
1da177e4 LT |
3840 | static const char *get_ksymbol(struct module *mod, |
3841 | unsigned long addr, | |
3842 | unsigned long *size, | |
3843 | unsigned long *offset) | |
3844 | { | |
3845 | unsigned int i, best = 0; | |
3846 | unsigned long nextval; | |
8244062e | 3847 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
3848 | |
3849 | /* At worse, next value is at end of module */ | |
a06f6211 | 3850 | if (within_module_init(addr, mod)) |
7523e4dc | 3851 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 3852 | else |
7523e4dc | 3853 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 3854 | |
25985edc | 3855 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3856 | starts real symbols at 1). */ |
8244062e RR |
3857 | for (i = 1; i < kallsyms->num_symtab; i++) { |
3858 | if (kallsyms->symtab[i].st_shndx == SHN_UNDEF) | |
1da177e4 LT |
3859 | continue; |
3860 | ||
3861 | /* We ignore unnamed symbols: they're uninformative | |
3862 | * and inserted at a whim. */ | |
8244062e RR |
3863 | if (*symname(kallsyms, i) == '\0' |
3864 | || is_arm_mapping_symbol(symname(kallsyms, i))) | |
2e7bac53 RR |
3865 | continue; |
3866 | ||
8244062e RR |
3867 | if (kallsyms->symtab[i].st_value <= addr |
3868 | && kallsyms->symtab[i].st_value > kallsyms->symtab[best].st_value) | |
1da177e4 | 3869 | best = i; |
8244062e RR |
3870 | if (kallsyms->symtab[i].st_value > addr |
3871 | && kallsyms->symtab[i].st_value < nextval) | |
3872 | nextval = kallsyms->symtab[i].st_value; | |
1da177e4 LT |
3873 | } |
3874 | ||
3875 | if (!best) | |
3876 | return NULL; | |
3877 | ||
ffb45122 | 3878 | if (size) |
8244062e | 3879 | *size = nextval - kallsyms->symtab[best].st_value; |
ffb45122 | 3880 | if (offset) |
8244062e RR |
3881 | *offset = addr - kallsyms->symtab[best].st_value; |
3882 | return symname(kallsyms, best); | |
1da177e4 LT |
3883 | } |
3884 | ||
6dd06c9f RR |
3885 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3886 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3887 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3888 | unsigned long *size, |
3889 | unsigned long *offset, | |
3890 | char **modname, | |
3891 | char *namebuf) | |
1da177e4 | 3892 | { |
cb2a5205 | 3893 | const char *ret = NULL; |
b7df4d1b | 3894 | struct module *mod; |
1da177e4 | 3895 | |
cb2a5205 | 3896 | preempt_disable(); |
b7df4d1b PZ |
3897 | mod = __module_address(addr); |
3898 | if (mod) { | |
3899 | if (modname) | |
3900 | *modname = mod->name; | |
3901 | ret = get_ksymbol(mod, addr, size, offset); | |
1da177e4 | 3902 | } |
6dd06c9f RR |
3903 | /* Make a copy in here where it's safe */ |
3904 | if (ret) { | |
3905 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3906 | ret = namebuf; | |
3907 | } | |
cb2a5205 | 3908 | preempt_enable(); |
b7df4d1b | 3909 | |
92dfc9dc | 3910 | return ret; |
1da177e4 LT |
3911 | } |
3912 | ||
9d65cb4a AD |
3913 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3914 | { | |
3915 | struct module *mod; | |
3916 | ||
cb2a5205 | 3917 | preempt_disable(); |
d72b3751 | 3918 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3919 | if (mod->state == MODULE_STATE_UNFORMED) |
3920 | continue; | |
9b20a352 | 3921 | if (within_module(addr, mod)) { |
9d65cb4a AD |
3922 | const char *sym; |
3923 | ||
3924 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3925 | if (!sym) | |
3926 | goto out; | |
9281acea | 3927 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3928 | preempt_enable(); |
9d65cb4a AD |
3929 | return 0; |
3930 | } | |
3931 | } | |
3932 | out: | |
cb2a5205 | 3933 | preempt_enable(); |
9d65cb4a AD |
3934 | return -ERANGE; |
3935 | } | |
3936 | ||
a5c43dae AD |
3937 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3938 | unsigned long *offset, char *modname, char *name) | |
3939 | { | |
3940 | struct module *mod; | |
3941 | ||
cb2a5205 | 3942 | preempt_disable(); |
d72b3751 | 3943 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3944 | if (mod->state == MODULE_STATE_UNFORMED) |
3945 | continue; | |
9b20a352 | 3946 | if (within_module(addr, mod)) { |
a5c43dae AD |
3947 | const char *sym; |
3948 | ||
3949 | sym = get_ksymbol(mod, addr, size, offset); | |
3950 | if (!sym) | |
3951 | goto out; | |
3952 | if (modname) | |
9281acea | 3953 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3954 | if (name) |
9281acea | 3955 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3956 | preempt_enable(); |
a5c43dae AD |
3957 | return 0; |
3958 | } | |
3959 | } | |
3960 | out: | |
cb2a5205 | 3961 | preempt_enable(); |
a5c43dae AD |
3962 | return -ERANGE; |
3963 | } | |
3964 | ||
ea07890a AD |
3965 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3966 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3967 | { |
3968 | struct module *mod; | |
3969 | ||
cb2a5205 | 3970 | preempt_disable(); |
d72b3751 | 3971 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
3972 | struct mod_kallsyms *kallsyms; |
3973 | ||
0d21b0e3 RR |
3974 | if (mod->state == MODULE_STATE_UNFORMED) |
3975 | continue; | |
8244062e RR |
3976 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
3977 | if (symnum < kallsyms->num_symtab) { | |
3978 | *value = kallsyms->symtab[symnum].st_value; | |
3979 | *type = kallsyms->symtab[symnum].st_info; | |
3980 | strlcpy(name, symname(kallsyms, symnum), KSYM_NAME_LEN); | |
9281acea | 3981 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 3982 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3983 | preempt_enable(); |
ea07890a | 3984 | return 0; |
1da177e4 | 3985 | } |
8244062e | 3986 | symnum -= kallsyms->num_symtab; |
1da177e4 | 3987 | } |
cb2a5205 | 3988 | preempt_enable(); |
ea07890a | 3989 | return -ERANGE; |
1da177e4 LT |
3990 | } |
3991 | ||
3992 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3993 | { | |
3994 | unsigned int i; | |
8244062e | 3995 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 3996 | |
8244062e RR |
3997 | for (i = 0; i < kallsyms->num_symtab; i++) |
3998 | if (strcmp(name, symname(kallsyms, i)) == 0 && | |
3999 | kallsyms->symtab[i].st_info != 'U') | |
4000 | return kallsyms->symtab[i].st_value; | |
1da177e4 LT |
4001 | return 0; |
4002 | } | |
4003 | ||
4004 | /* Look for this name: can be of form module:name. */ | |
4005 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4006 | { | |
4007 | struct module *mod; | |
4008 | char *colon; | |
4009 | unsigned long ret = 0; | |
4010 | ||
4011 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4012 | preempt_disable(); |
1da177e4 | 4013 | if ((colon = strchr(name, ':')) != NULL) { |
4f6de4d5 | 4014 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 4015 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 4016 | } else { |
0d21b0e3 RR |
4017 | list_for_each_entry_rcu(mod, &modules, list) { |
4018 | if (mod->state == MODULE_STATE_UNFORMED) | |
4019 | continue; | |
1da177e4 LT |
4020 | if ((ret = mod_find_symname(mod, name)) != 0) |
4021 | break; | |
0d21b0e3 | 4022 | } |
1da177e4 | 4023 | } |
cb2a5205 | 4024 | preempt_enable(); |
1da177e4 LT |
4025 | return ret; |
4026 | } | |
75a66614 AK |
4027 | |
4028 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4029 | struct module *, unsigned long), | |
4030 | void *data) | |
4031 | { | |
4032 | struct module *mod; | |
4033 | unsigned int i; | |
4034 | int ret; | |
4035 | ||
0be964be PZ |
4036 | module_assert_mutex(); |
4037 | ||
75a66614 | 4038 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4039 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4040 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4041 | ||
0d21b0e3 RR |
4042 | if (mod->state == MODULE_STATE_UNFORMED) |
4043 | continue; | |
8244062e RR |
4044 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4045 | ret = fn(data, symname(kallsyms, i), | |
4046 | mod, kallsyms->symtab[i].st_value); | |
75a66614 AK |
4047 | if (ret != 0) |
4048 | return ret; | |
4049 | } | |
4050 | } | |
4051 | return 0; | |
4052 | } | |
1da177e4 LT |
4053 | #endif /* CONFIG_KALLSYMS */ |
4054 | ||
7fd8329b PM |
4055 | /* Maximum number of characters written by module_flags() */ |
4056 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4057 | ||
4058 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4059 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4060 | { |
4061 | int bx = 0; | |
4062 | ||
0d21b0e3 | 4063 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4064 | if (mod->taints || |
4065 | mod->state == MODULE_STATE_GOING || | |
4066 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4067 | buf[bx++] = '('; |
cca3e707 | 4068 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4069 | /* Show a - for module-is-being-unloaded */ |
4070 | if (mod->state == MODULE_STATE_GOING) | |
4071 | buf[bx++] = '-'; | |
4072 | /* Show a + for module-is-being-loaded */ | |
4073 | if (mod->state == MODULE_STATE_COMING) | |
4074 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4075 | buf[bx++] = ')'; |
4076 | } | |
4077 | buf[bx] = '\0'; | |
4078 | ||
4079 | return buf; | |
4080 | } | |
4081 | ||
3b5d5c6b AD |
4082 | #ifdef CONFIG_PROC_FS |
4083 | /* Called by the /proc file system to return a list of modules. */ | |
4084 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4085 | { | |
4086 | mutex_lock(&module_mutex); | |
4087 | return seq_list_start(&modules, *pos); | |
4088 | } | |
4089 | ||
4090 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4091 | { | |
4092 | return seq_list_next(p, &modules, pos); | |
4093 | } | |
4094 | ||
4095 | static void m_stop(struct seq_file *m, void *p) | |
4096 | { | |
4097 | mutex_unlock(&module_mutex); | |
4098 | } | |
4099 | ||
1da177e4 LT |
4100 | static int m_show(struct seq_file *m, void *p) |
4101 | { | |
4102 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4103 | char buf[MODULE_FLAGS_BUF_SIZE]; |
fa3ba2e8 | 4104 | |
0d21b0e3 RR |
4105 | /* We always ignore unformed modules. */ |
4106 | if (mod->state == MODULE_STATE_UNFORMED) | |
4107 | return 0; | |
4108 | ||
2f0f2a33 | 4109 | seq_printf(m, "%s %u", |
7523e4dc | 4110 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4111 | print_unload_info(m, mod); |
4112 | ||
4113 | /* Informative for users. */ | |
4114 | seq_printf(m, " %s", | |
6da0b565 IA |
4115 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4116 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4117 | "Live"); |
4118 | /* Used by oprofile and other similar tools. */ | |
7523e4dc | 4119 | seq_printf(m, " 0x%pK", mod->core_layout.base); |
1da177e4 | 4120 | |
fa3ba2e8 FM |
4121 | /* Taints info */ |
4122 | if (mod->taints) | |
21aa9280 | 4123 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4124 | |
6da0b565 | 4125 | seq_puts(m, "\n"); |
1da177e4 LT |
4126 | return 0; |
4127 | } | |
4128 | ||
4129 | /* Format: modulename size refcount deps address | |
4130 | ||
4131 | Where refcount is a number or -, and deps is a comma-separated list | |
4132 | of depends or -. | |
4133 | */ | |
3b5d5c6b | 4134 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4135 | .start = m_start, |
4136 | .next = m_next, | |
4137 | .stop = m_stop, | |
4138 | .show = m_show | |
4139 | }; | |
4140 | ||
3b5d5c6b AD |
4141 | static int modules_open(struct inode *inode, struct file *file) |
4142 | { | |
4143 | return seq_open(file, &modules_op); | |
4144 | } | |
4145 | ||
4146 | static const struct file_operations proc_modules_operations = { | |
4147 | .open = modules_open, | |
4148 | .read = seq_read, | |
4149 | .llseek = seq_lseek, | |
4150 | .release = seq_release, | |
4151 | }; | |
4152 | ||
4153 | static int __init proc_modules_init(void) | |
4154 | { | |
4155 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4156 | return 0; | |
4157 | } | |
4158 | module_init(proc_modules_init); | |
4159 | #endif | |
4160 | ||
1da177e4 LT |
4161 | /* Given an address, look for it in the module exception tables. */ |
4162 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4163 | { | |
1da177e4 LT |
4164 | const struct exception_table_entry *e = NULL; |
4165 | struct module *mod; | |
4166 | ||
24da1cbf | 4167 | preempt_disable(); |
d72b3751 | 4168 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4169 | if (mod->state == MODULE_STATE_UNFORMED) |
4170 | continue; | |
1da177e4 LT |
4171 | if (mod->num_exentries == 0) |
4172 | continue; | |
22a8bdeb | 4173 | |
1da177e4 LT |
4174 | e = search_extable(mod->extable, |
4175 | mod->extable + mod->num_exentries - 1, | |
4176 | addr); | |
4177 | if (e) | |
4178 | break; | |
4179 | } | |
24da1cbf | 4180 | preempt_enable(); |
1da177e4 LT |
4181 | |
4182 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 4183 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
4184 | return e; |
4185 | } | |
4186 | ||
4d435f9d | 4187 | /* |
e610499e RR |
4188 | * is_module_address - is this address inside a module? |
4189 | * @addr: the address to check. | |
4190 | * | |
4191 | * See is_module_text_address() if you simply want to see if the address | |
4192 | * is code (not data). | |
4d435f9d | 4193 | */ |
e610499e | 4194 | bool is_module_address(unsigned long addr) |
4d435f9d | 4195 | { |
e610499e | 4196 | bool ret; |
4d435f9d | 4197 | |
24da1cbf | 4198 | preempt_disable(); |
e610499e | 4199 | ret = __module_address(addr) != NULL; |
24da1cbf | 4200 | preempt_enable(); |
4d435f9d | 4201 | |
e610499e | 4202 | return ret; |
4d435f9d IM |
4203 | } |
4204 | ||
e610499e RR |
4205 | /* |
4206 | * __module_address - get the module which contains an address. | |
4207 | * @addr: the address. | |
4208 | * | |
4209 | * Must be called with preempt disabled or module mutex held so that | |
4210 | * module doesn't get freed during this. | |
4211 | */ | |
714f83d5 | 4212 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4213 | { |
4214 | struct module *mod; | |
4215 | ||
3a642e99 RR |
4216 | if (addr < module_addr_min || addr > module_addr_max) |
4217 | return NULL; | |
4218 | ||
0be964be PZ |
4219 | module_assert_mutex_or_preempt(); |
4220 | ||
6c9692e2 | 4221 | mod = mod_find(addr); |
93c2e105 PZ |
4222 | if (mod) { |
4223 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4224 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4225 | mod = NULL; |
0d21b0e3 | 4226 | } |
93c2e105 | 4227 | return mod; |
1da177e4 | 4228 | } |
c6b37801 | 4229 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4230 | |
e610499e RR |
4231 | /* |
4232 | * is_module_text_address - is this address inside module code? | |
4233 | * @addr: the address to check. | |
4234 | * | |
4235 | * See is_module_address() if you simply want to see if the address is | |
4236 | * anywhere in a module. See kernel_text_address() for testing if an | |
4237 | * address corresponds to kernel or module code. | |
4238 | */ | |
4239 | bool is_module_text_address(unsigned long addr) | |
4240 | { | |
4241 | bool ret; | |
4242 | ||
4243 | preempt_disable(); | |
4244 | ret = __module_text_address(addr) != NULL; | |
4245 | preempt_enable(); | |
4246 | ||
4247 | return ret; | |
4248 | } | |
4249 | ||
4250 | /* | |
4251 | * __module_text_address - get the module whose code contains an address. | |
4252 | * @addr: the address. | |
4253 | * | |
4254 | * Must be called with preempt disabled or module mutex held so that | |
4255 | * module doesn't get freed during this. | |
4256 | */ | |
4257 | struct module *__module_text_address(unsigned long addr) | |
4258 | { | |
4259 | struct module *mod = __module_address(addr); | |
4260 | if (mod) { | |
4261 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4262 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4263 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4264 | mod = NULL; |
4265 | } | |
4266 | return mod; | |
4267 | } | |
c6b37801 | 4268 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4269 | |
1da177e4 LT |
4270 | /* Don't grab lock, we're oopsing. */ |
4271 | void print_modules(void) | |
4272 | { | |
4273 | struct module *mod; | |
7fd8329b | 4274 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4275 | |
b231125a | 4276 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4277 | /* Most callers should already have preempt disabled, but make sure */ |
4278 | preempt_disable(); | |
0d21b0e3 RR |
4279 | list_for_each_entry_rcu(mod, &modules, list) { |
4280 | if (mod->state == MODULE_STATE_UNFORMED) | |
4281 | continue; | |
27bba4d6 | 4282 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4283 | } |
d72b3751 | 4284 | preempt_enable(); |
e14af7ee | 4285 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4286 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4287 | pr_cont("\n"); | |
1da177e4 LT |
4288 | } |
4289 | ||
1da177e4 | 4290 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4291 | /* Generate the signature for all relevant module structures here. |
4292 | * If these change, we don't want to try to parse the module. */ | |
4293 | void module_layout(struct module *mod, | |
4294 | struct modversion_info *ver, | |
4295 | struct kernel_param *kp, | |
4296 | struct kernel_symbol *ks, | |
65498646 | 4297 | struct tracepoint * const *tp) |
8c8ef42a RR |
4298 | { |
4299 | } | |
4300 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4301 | #endif |