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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> |
8a293be0 | 20 | #include <linux/extable.h> |
1da177e4 | 21 | #include <linux/moduleloader.h> |
af658dca | 22 | #include <linux/trace_events.h> |
1da177e4 | 23 | #include <linux/init.h> |
ae84e324 | 24 | #include <linux/kallsyms.h> |
34e1169d | 25 | #include <linux/file.h> |
3b5d5c6b | 26 | #include <linux/fs.h> |
6d760133 | 27 | #include <linux/sysfs.h> |
9f158333 | 28 | #include <linux/kernel.h> |
1da177e4 LT |
29 | #include <linux/slab.h> |
30 | #include <linux/vmalloc.h> | |
31 | #include <linux/elf.h> | |
3b5d5c6b | 32 | #include <linux/proc_fs.h> |
2e72d51b | 33 | #include <linux/security.h> |
1da177e4 LT |
34 | #include <linux/seq_file.h> |
35 | #include <linux/syscalls.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/rcupdate.h> | |
c59ede7b | 38 | #include <linux/capability.h> |
1da177e4 LT |
39 | #include <linux/cpu.h> |
40 | #include <linux/moduleparam.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/err.h> | |
43 | #include <linux/vermagic.h> | |
44 | #include <linux/notifier.h> | |
f6a57033 | 45 | #include <linux/sched.h> |
1da177e4 | 46 | #include <linux/device.h> |
c988d2b2 | 47 | #include <linux/string.h> |
97d1f15b | 48 | #include <linux/mutex.h> |
d72b3751 | 49 | #include <linux/rculist.h> |
7c0f6ba6 | 50 | #include <linux/uaccess.h> |
1da177e4 | 51 | #include <asm/cacheflush.h> |
563ec5cb | 52 | #include <linux/set_memory.h> |
eb8cdec4 | 53 | #include <asm/mmu_context.h> |
b817f6fe | 54 | #include <linux/license.h> |
6d762394 | 55 | #include <asm/sections.h> |
97e1c18e | 56 | #include <linux/tracepoint.h> |
90d595fe | 57 | #include <linux/ftrace.h> |
7e545d6e | 58 | #include <linux/livepatch.h> |
22a9d645 | 59 | #include <linux/async.h> |
fbf59bc9 | 60 | #include <linux/percpu.h> |
4f2294b6 | 61 | #include <linux/kmemleak.h> |
bf5438fc | 62 | #include <linux/jump_label.h> |
84e1c6bb | 63 | #include <linux/pfn.h> |
403ed278 | 64 | #include <linux/bsearch.h> |
9d5059c9 | 65 | #include <linux/dynamic_debug.h> |
ca86cad7 | 66 | #include <linux/audit.h> |
2f3238ae | 67 | #include <uapi/linux/module.h> |
106a4ee2 | 68 | #include "module-internal.h" |
1da177e4 | 69 | |
7ead8b83 LZ |
70 | #define CREATE_TRACE_POINTS |
71 | #include <trace/events/module.h> | |
72 | ||
1da177e4 LT |
73 | #ifndef ARCH_SHF_SMALL |
74 | #define ARCH_SHF_SMALL 0 | |
75 | #endif | |
76 | ||
84e1c6bb MC |
77 | /* |
78 | * Modules' sections will be aligned on page boundaries | |
79 | * to ensure complete separation of code and data, but | |
0f5bf6d0 | 80 | * only when CONFIG_STRICT_MODULE_RWX=y |
84e1c6bb | 81 | */ |
0f5bf6d0 | 82 | #ifdef CONFIG_STRICT_MODULE_RWX |
84e1c6bb MC |
83 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
84 | #else | |
85 | # define debug_align(X) (X) | |
86 | #endif | |
87 | ||
1da177e4 LT |
88 | /* If this is set, the section belongs in the init part of the module */ |
89 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
90 | ||
75676500 RR |
91 | /* |
92 | * Mutex protects: | |
93 | * 1) List of modules (also safely readable with preempt_disable), | |
94 | * 2) module_use links, | |
95 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 96 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
97 | DEFINE_MUTEX(module_mutex); |
98 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 99 | static LIST_HEAD(modules); |
67fc4e0c | 100 | |
6c9692e2 | 101 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 102 | |
93c2e105 PZ |
103 | /* |
104 | * Use a latched RB-tree for __module_address(); this allows us to use | |
105 | * RCU-sched lookups of the address from any context. | |
106 | * | |
6c9692e2 PZ |
107 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
108 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
109 | * NMI context. | |
93c2e105 PZ |
110 | */ |
111 | ||
112 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 113 | { |
7523e4dc | 114 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 115 | |
7523e4dc | 116 | return (unsigned long)layout->base; |
93c2e105 PZ |
117 | } |
118 | ||
119 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
120 | { | |
7523e4dc | 121 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 122 | |
7523e4dc | 123 | return (unsigned long)layout->size; |
93c2e105 PZ |
124 | } |
125 | ||
126 | static __always_inline bool | |
127 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
128 | { | |
129 | return __mod_tree_val(a) < __mod_tree_val(b); | |
130 | } | |
131 | ||
132 | static __always_inline int | |
133 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
134 | { | |
135 | unsigned long val = (unsigned long)key; | |
136 | unsigned long start, end; | |
137 | ||
138 | start = __mod_tree_val(n); | |
139 | if (val < start) | |
140 | return -1; | |
141 | ||
142 | end = start + __mod_tree_size(n); | |
143 | if (val >= end) | |
144 | return 1; | |
106a4ee2 | 145 | |
106a4ee2 RR |
146 | return 0; |
147 | } | |
148 | ||
93c2e105 PZ |
149 | static const struct latch_tree_ops mod_tree_ops = { |
150 | .less = mod_tree_less, | |
151 | .comp = mod_tree_comp, | |
152 | }; | |
153 | ||
4f666546 PZ |
154 | static struct mod_tree_root { |
155 | struct latch_tree_root root; | |
156 | unsigned long addr_min; | |
157 | unsigned long addr_max; | |
158 | } mod_tree __cacheline_aligned = { | |
159 | .addr_min = -1UL, | |
106a4ee2 | 160 | }; |
106a4ee2 | 161 | |
4f666546 PZ |
162 | #define module_addr_min mod_tree.addr_min |
163 | #define module_addr_max mod_tree.addr_max | |
164 | ||
165 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
166 | { | |
167 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
168 | } | |
169 | ||
170 | static void __mod_tree_remove(struct mod_tree_node *node) | |
171 | { | |
172 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
173 | } | |
93c2e105 PZ |
174 | |
175 | /* | |
176 | * These modifications: insert, remove_init and remove; are serialized by the | |
177 | * module_mutex. | |
178 | */ | |
179 | static void mod_tree_insert(struct module *mod) | |
180 | { | |
7523e4dc RR |
181 | mod->core_layout.mtn.mod = mod; |
182 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 183 | |
7523e4dc RR |
184 | __mod_tree_insert(&mod->core_layout.mtn); |
185 | if (mod->init_layout.size) | |
186 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
187 | } |
188 | ||
189 | static void mod_tree_remove_init(struct module *mod) | |
190 | { | |
7523e4dc RR |
191 | if (mod->init_layout.size) |
192 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
193 | } |
194 | ||
195 | static void mod_tree_remove(struct module *mod) | |
196 | { | |
7523e4dc | 197 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
198 | mod_tree_remove_init(mod); |
199 | } | |
200 | ||
6c9692e2 | 201 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
202 | { |
203 | struct latch_tree_node *ltn; | |
204 | ||
4f666546 | 205 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
206 | if (!ltn) |
207 | return NULL; | |
208 | ||
209 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
210 | } | |
211 | ||
6c9692e2 PZ |
212 | #else /* MODULES_TREE_LOOKUP */ |
213 | ||
4f666546 PZ |
214 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
215 | ||
6c9692e2 PZ |
216 | static void mod_tree_insert(struct module *mod) { } |
217 | static void mod_tree_remove_init(struct module *mod) { } | |
218 | static void mod_tree_remove(struct module *mod) { } | |
219 | ||
220 | static struct module *mod_find(unsigned long addr) | |
221 | { | |
222 | struct module *mod; | |
223 | ||
224 | list_for_each_entry_rcu(mod, &modules, list) { | |
225 | if (within_module(addr, mod)) | |
226 | return mod; | |
227 | } | |
228 | ||
229 | return NULL; | |
230 | } | |
231 | ||
232 | #endif /* MODULES_TREE_LOOKUP */ | |
233 | ||
4f666546 PZ |
234 | /* |
235 | * Bounds of module text, for speeding up __module_address. | |
236 | * Protected by module_mutex. | |
237 | */ | |
238 | static void __mod_update_bounds(void *base, unsigned int size) | |
239 | { | |
240 | unsigned long min = (unsigned long)base; | |
241 | unsigned long max = min + size; | |
242 | ||
243 | if (min < module_addr_min) | |
244 | module_addr_min = min; | |
245 | if (max > module_addr_max) | |
246 | module_addr_max = max; | |
247 | } | |
248 | ||
249 | static void mod_update_bounds(struct module *mod) | |
250 | { | |
7523e4dc RR |
251 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
252 | if (mod->init_layout.size) | |
253 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
254 | } |
255 | ||
67fc4e0c JW |
256 | #ifdef CONFIG_KGDB_KDB |
257 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
258 | #endif /* CONFIG_KGDB_KDB */ | |
259 | ||
0be964be PZ |
260 | static void module_assert_mutex(void) |
261 | { | |
262 | lockdep_assert_held(&module_mutex); | |
263 | } | |
264 | ||
265 | static void module_assert_mutex_or_preempt(void) | |
266 | { | |
267 | #ifdef CONFIG_LOCKDEP | |
268 | if (unlikely(!debug_locks)) | |
269 | return; | |
270 | ||
9502514f | 271 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
272 | !lockdep_is_held(&module_mutex)); |
273 | #endif | |
274 | } | |
275 | ||
6727bb9c | 276 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 277 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 278 | |
fda784e5 BM |
279 | /* |
280 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
281 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
282 | */ | |
283 | bool is_module_sig_enforced(void) | |
284 | { | |
285 | return sig_enforce; | |
286 | } | |
287 | EXPORT_SYMBOL(is_module_sig_enforced); | |
288 | ||
19e4529e SR |
289 | /* Block module loading/unloading? */ |
290 | int modules_disabled = 0; | |
02608bef | 291 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 292 | |
c9a3ba55 RR |
293 | /* Waiting for a module to finish initializing? */ |
294 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
295 | ||
e041c683 | 296 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 297 | |
6da0b565 | 298 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 299 | { |
e041c683 | 300 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
301 | } |
302 | EXPORT_SYMBOL(register_module_notifier); | |
303 | ||
6da0b565 | 304 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 305 | { |
e041c683 | 306 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
307 | } |
308 | EXPORT_SYMBOL(unregister_module_notifier); | |
309 | ||
eded41c1 | 310 | struct load_info { |
96b5b194 | 311 | const char *name; |
eded41c1 RR |
312 | Elf_Ehdr *hdr; |
313 | unsigned long len; | |
314 | Elf_Shdr *sechdrs; | |
6526c534 | 315 | char *secstrings, *strtab; |
d913188c | 316 | unsigned long symoffs, stroffs; |
811d66a0 RR |
317 | struct _ddebug *debug; |
318 | unsigned int num_debug; | |
106a4ee2 | 319 | bool sig_ok; |
8244062e RR |
320 | #ifdef CONFIG_KALLSYMS |
321 | unsigned long mod_kallsyms_init_off; | |
322 | #endif | |
eded41c1 RR |
323 | struct { |
324 | unsigned int sym, str, mod, vers, info, pcpu; | |
325 | } index; | |
326 | }; | |
327 | ||
71d9f507 MB |
328 | /* |
329 | * We require a truly strong try_module_get(): 0 means success. | |
330 | * Otherwise an error is returned due to ongoing or failed | |
331 | * initialization etc. | |
332 | */ | |
1da177e4 LT |
333 | static inline int strong_try_module_get(struct module *mod) |
334 | { | |
0d21b0e3 | 335 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 336 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
337 | return -EBUSY; |
338 | if (try_module_get(mod)) | |
1da177e4 | 339 | return 0; |
c9a3ba55 RR |
340 | else |
341 | return -ENOENT; | |
1da177e4 LT |
342 | } |
343 | ||
373d4d09 RR |
344 | static inline void add_taint_module(struct module *mod, unsigned flag, |
345 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 346 | { |
373d4d09 | 347 | add_taint(flag, lockdep_ok); |
7fd8329b | 348 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
349 | } |
350 | ||
02a3e59a RD |
351 | /* |
352 | * A thread that wants to hold a reference to a module only while it | |
353 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 354 | */ |
bf262dce | 355 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
356 | { |
357 | module_put(mod); | |
358 | do_exit(code); | |
359 | } | |
360 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 361 | |
1da177e4 | 362 | /* Find a module section: 0 means not found. */ |
49668688 | 363 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
364 | { |
365 | unsigned int i; | |
366 | ||
49668688 RR |
367 | for (i = 1; i < info->hdr->e_shnum; i++) { |
368 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 369 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
370 | if ((shdr->sh_flags & SHF_ALLOC) |
371 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 372 | return i; |
49668688 | 373 | } |
1da177e4 LT |
374 | return 0; |
375 | } | |
376 | ||
5e458cc0 | 377 | /* Find a module section, or NULL. */ |
49668688 | 378 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
379 | { |
380 | /* Section 0 has sh_addr 0. */ | |
49668688 | 381 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
382 | } |
383 | ||
384 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 385 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
386 | const char *name, |
387 | size_t object_size, | |
388 | unsigned int *num) | |
389 | { | |
49668688 | 390 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
391 | |
392 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
393 | *num = info->sechdrs[sec].sh_size / object_size; |
394 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
395 | } |
396 | ||
1da177e4 LT |
397 | /* Provided by the linker */ |
398 | extern const struct kernel_symbol __start___ksymtab[]; | |
399 | extern const struct kernel_symbol __stop___ksymtab[]; | |
400 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
401 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
402 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
403 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
404 | extern const s32 __start___kcrctab[]; |
405 | extern const s32 __start___kcrctab_gpl[]; | |
406 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
407 | #ifdef CONFIG_UNUSED_SYMBOLS |
408 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
409 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
410 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
411 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
412 | extern const s32 __start___kcrctab_unused[]; |
413 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 414 | #endif |
1da177e4 LT |
415 | |
416 | #ifndef CONFIG_MODVERSIONS | |
417 | #define symversion(base, idx) NULL | |
418 | #else | |
f83ca9fe | 419 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
420 | #endif |
421 | ||
dafd0940 RR |
422 | static bool each_symbol_in_section(const struct symsearch *arr, |
423 | unsigned int arrsize, | |
424 | struct module *owner, | |
425 | bool (*fn)(const struct symsearch *syms, | |
426 | struct module *owner, | |
de4d8d53 | 427 | void *data), |
dafd0940 | 428 | void *data) |
ad9546c9 | 429 | { |
de4d8d53 | 430 | unsigned int j; |
ad9546c9 | 431 | |
dafd0940 | 432 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
433 | if (fn(&arr[j], owner, data)) |
434 | return true; | |
f71d20e9 | 435 | } |
dafd0940 RR |
436 | |
437 | return false; | |
ad9546c9 RR |
438 | } |
439 | ||
dafd0940 | 440 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
441 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
442 | struct module *owner, | |
443 | void *data), | |
444 | void *data) | |
ad9546c9 RR |
445 | { |
446 | struct module *mod; | |
44032e63 | 447 | static const struct symsearch arr[] = { |
ad9546c9 | 448 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 449 | NOT_GPL_ONLY, false }, |
ad9546c9 | 450 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
451 | __start___kcrctab_gpl, |
452 | GPL_ONLY, false }, | |
ad9546c9 | 453 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
454 | __start___kcrctab_gpl_future, |
455 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 456 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 457 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
458 | __start___kcrctab_unused, |
459 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 460 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
461 | __start___kcrctab_unused_gpl, |
462 | GPL_ONLY, true }, | |
f7f5b675 | 463 | #endif |
ad9546c9 | 464 | }; |
f71d20e9 | 465 | |
0be964be PZ |
466 | module_assert_mutex_or_preempt(); |
467 | ||
dafd0940 RR |
468 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
469 | return true; | |
f71d20e9 | 470 | |
d72b3751 | 471 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
472 | struct symsearch arr[] = { |
473 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 474 | NOT_GPL_ONLY, false }, |
ad9546c9 | 475 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
476 | mod->gpl_crcs, |
477 | GPL_ONLY, false }, | |
ad9546c9 RR |
478 | { mod->gpl_future_syms, |
479 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
480 | mod->gpl_future_crcs, |
481 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 482 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
483 | { mod->unused_syms, |
484 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
485 | mod->unused_crcs, |
486 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
487 | { mod->unused_gpl_syms, |
488 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
489 | mod->unused_gpl_crcs, |
490 | GPL_ONLY, true }, | |
f7f5b675 | 491 | #endif |
ad9546c9 RR |
492 | }; |
493 | ||
0d21b0e3 RR |
494 | if (mod->state == MODULE_STATE_UNFORMED) |
495 | continue; | |
496 | ||
dafd0940 RR |
497 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
498 | return true; | |
499 | } | |
500 | return false; | |
501 | } | |
de4d8d53 | 502 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
503 | |
504 | struct find_symbol_arg { | |
505 | /* Input */ | |
506 | const char *name; | |
507 | bool gplok; | |
508 | bool warn; | |
509 | ||
510 | /* Output */ | |
511 | struct module *owner; | |
71810db2 | 512 | const s32 *crc; |
414fd31b | 513 | const struct kernel_symbol *sym; |
dafd0940 RR |
514 | }; |
515 | ||
de4d8d53 RR |
516 | static bool check_symbol(const struct symsearch *syms, |
517 | struct module *owner, | |
518 | unsigned int symnum, void *data) | |
dafd0940 RR |
519 | { |
520 | struct find_symbol_arg *fsa = data; | |
521 | ||
dafd0940 RR |
522 | if (!fsa->gplok) { |
523 | if (syms->licence == GPL_ONLY) | |
524 | return false; | |
525 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
526 | pr_warn("Symbol %s is being used by a non-GPL module, " |
527 | "which will not be allowed in the future\n", | |
528 | fsa->name); | |
9f28bb7e | 529 | } |
1da177e4 | 530 | } |
ad9546c9 | 531 | |
f7f5b675 | 532 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 533 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
534 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
535 | "using it.\n", fsa->name); | |
536 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
537 | pr_warn("Please evaluate if this is the right api to use and " |
538 | "if it really is, submit a report to the linux kernel " | |
539 | "mailing list together with submitting your code for " | |
bddb12b3 | 540 | "inclusion.\n"); |
dafd0940 | 541 | } |
f7f5b675 | 542 | #endif |
dafd0940 RR |
543 | |
544 | fsa->owner = owner; | |
545 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 546 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
547 | return true; |
548 | } | |
549 | ||
403ed278 AIB |
550 | static int cmp_name(const void *va, const void *vb) |
551 | { | |
552 | const char *a; | |
553 | const struct kernel_symbol *b; | |
554 | a = va; b = vb; | |
555 | return strcmp(a, b->name); | |
556 | } | |
557 | ||
de4d8d53 RR |
558 | static bool find_symbol_in_section(const struct symsearch *syms, |
559 | struct module *owner, | |
560 | void *data) | |
561 | { | |
562 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
563 | struct kernel_symbol *sym; |
564 | ||
565 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
566 | sizeof(struct kernel_symbol), cmp_name); | |
567 | ||
568 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
569 | return true; | |
de4d8d53 | 570 | |
de4d8d53 RR |
571 | return false; |
572 | } | |
573 | ||
414fd31b | 574 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 575 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
576 | const struct kernel_symbol *find_symbol(const char *name, |
577 | struct module **owner, | |
71810db2 | 578 | const s32 **crc, |
c6b37801 TA |
579 | bool gplok, |
580 | bool warn) | |
dafd0940 RR |
581 | { |
582 | struct find_symbol_arg fsa; | |
583 | ||
584 | fsa.name = name; | |
585 | fsa.gplok = gplok; | |
586 | fsa.warn = warn; | |
587 | ||
de4d8d53 | 588 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
589 | if (owner) |
590 | *owner = fsa.owner; | |
591 | if (crc) | |
592 | *crc = fsa.crc; | |
414fd31b | 593 | return fsa.sym; |
dafd0940 RR |
594 | } |
595 | ||
5e124169 | 596 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 597 | return NULL; |
1da177e4 | 598 | } |
c6b37801 | 599 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 600 | |
fe0d34d2 RR |
601 | /* |
602 | * Search for module by name: must hold module_mutex (or preempt disabled | |
603 | * for read-only access). | |
604 | */ | |
4f6de4d5 | 605 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 606 | bool even_unformed) |
1da177e4 LT |
607 | { |
608 | struct module *mod; | |
609 | ||
fe0d34d2 | 610 | module_assert_mutex_or_preempt(); |
0be964be | 611 | |
93437353 | 612 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
613 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
614 | continue; | |
4f6de4d5 | 615 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
616 | return mod; |
617 | } | |
618 | return NULL; | |
619 | } | |
0d21b0e3 RR |
620 | |
621 | struct module *find_module(const char *name) | |
622 | { | |
fe0d34d2 | 623 | module_assert_mutex(); |
4f6de4d5 | 624 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 625 | } |
c6b37801 | 626 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
627 | |
628 | #ifdef CONFIG_SMP | |
fbf59bc9 | 629 | |
259354de | 630 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 631 | { |
259354de TH |
632 | return mod->percpu; |
633 | } | |
fbf59bc9 | 634 | |
9eb76d77 | 635 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 636 | { |
9eb76d77 RR |
637 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
638 | unsigned long align = pcpusec->sh_addralign; | |
639 | ||
640 | if (!pcpusec->sh_size) | |
641 | return 0; | |
642 | ||
fbf59bc9 | 643 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
644 | pr_warn("%s: per-cpu alignment %li > %li\n", |
645 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
646 | align = PAGE_SIZE; |
647 | } | |
648 | ||
9eb76d77 | 649 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 650 | if (!mod->percpu) { |
bddb12b3 AM |
651 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
652 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
653 | return -ENOMEM; |
654 | } | |
9eb76d77 | 655 | mod->percpu_size = pcpusec->sh_size; |
259354de | 656 | return 0; |
fbf59bc9 TH |
657 | } |
658 | ||
259354de | 659 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 660 | { |
259354de | 661 | free_percpu(mod->percpu); |
fbf59bc9 TH |
662 | } |
663 | ||
49668688 | 664 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 665 | { |
49668688 | 666 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
667 | } |
668 | ||
259354de TH |
669 | static void percpu_modcopy(struct module *mod, |
670 | const void *from, unsigned long size) | |
6b588c18 TH |
671 | { |
672 | int cpu; | |
673 | ||
674 | for_each_possible_cpu(cpu) | |
259354de | 675 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
676 | } |
677 | ||
383776fa | 678 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
679 | { |
680 | struct module *mod; | |
681 | unsigned int cpu; | |
682 | ||
683 | preempt_disable(); | |
684 | ||
685 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
686 | if (mod->state == MODULE_STATE_UNFORMED) |
687 | continue; | |
10fad5e4 TH |
688 | if (!mod->percpu_size) |
689 | continue; | |
690 | for_each_possible_cpu(cpu) { | |
691 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 692 | void *va = (void *)addr; |
10fad5e4 | 693 | |
383776fa | 694 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 695 | if (can_addr) { |
383776fa | 696 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
697 | *can_addr += (unsigned long) |
698 | per_cpu_ptr(mod->percpu, | |
699 | get_boot_cpu_id()); | |
700 | } | |
10fad5e4 TH |
701 | preempt_enable(); |
702 | return true; | |
703 | } | |
704 | } | |
705 | } | |
706 | ||
707 | preempt_enable(); | |
708 | return false; | |
6b588c18 TH |
709 | } |
710 | ||
383776fa TG |
711 | /** |
712 | * is_module_percpu_address - test whether address is from module static percpu | |
713 | * @addr: address to test | |
714 | * | |
715 | * Test whether @addr belongs to module static percpu area. | |
716 | * | |
717 | * RETURNS: | |
718 | * %true if @addr is from module static percpu area | |
719 | */ | |
720 | bool is_module_percpu_address(unsigned long addr) | |
721 | { | |
722 | return __is_module_percpu_address(addr, NULL); | |
723 | } | |
724 | ||
1da177e4 | 725 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 726 | |
259354de | 727 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
728 | { |
729 | return NULL; | |
730 | } | |
9eb76d77 | 731 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 732 | { |
9eb76d77 RR |
733 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
734 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
735 | return -ENOMEM; | |
736 | return 0; | |
259354de TH |
737 | } |
738 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 739 | { |
1da177e4 | 740 | } |
49668688 | 741 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
742 | { |
743 | return 0; | |
744 | } | |
259354de TH |
745 | static inline void percpu_modcopy(struct module *mod, |
746 | const void *from, unsigned long size) | |
1da177e4 LT |
747 | { |
748 | /* pcpusec should be 0, and size of that section should be 0. */ | |
749 | BUG_ON(size != 0); | |
750 | } | |
10fad5e4 TH |
751 | bool is_module_percpu_address(unsigned long addr) |
752 | { | |
753 | return false; | |
754 | } | |
6b588c18 | 755 | |
383776fa TG |
756 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
757 | { | |
758 | return false; | |
759 | } | |
760 | ||
1da177e4 LT |
761 | #endif /* CONFIG_SMP */ |
762 | ||
c988d2b2 MD |
763 | #define MODINFO_ATTR(field) \ |
764 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
765 | { \ | |
766 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
767 | } \ | |
768 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 769 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 770 | { \ |
cc56ded3 | 771 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
772 | } \ |
773 | static int modinfo_##field##_exists(struct module *mod) \ | |
774 | { \ | |
775 | return mod->field != NULL; \ | |
776 | } \ | |
777 | static void free_modinfo_##field(struct module *mod) \ | |
778 | { \ | |
22a8bdeb DW |
779 | kfree(mod->field); \ |
780 | mod->field = NULL; \ | |
c988d2b2 MD |
781 | } \ |
782 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 783 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
784 | .show = show_modinfo_##field, \ |
785 | .setup = setup_modinfo_##field, \ | |
786 | .test = modinfo_##field##_exists, \ | |
787 | .free = free_modinfo_##field, \ | |
788 | }; | |
789 | ||
790 | MODINFO_ATTR(version); | |
791 | MODINFO_ATTR(srcversion); | |
792 | ||
e14af7ee AV |
793 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
794 | ||
03e88ae1 | 795 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
796 | |
797 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
798 | ||
e513cc1c MH |
799 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
800 | #define MODULE_REF_BASE 1 | |
801 | ||
1da177e4 | 802 | /* Init the unload section of the module. */ |
9f85a4bb | 803 | static int module_unload_init(struct module *mod) |
1da177e4 | 804 | { |
e513cc1c MH |
805 | /* |
806 | * Initialize reference counter to MODULE_REF_BASE. | |
807 | * refcnt == 0 means module is going. | |
808 | */ | |
809 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 810 | |
2c02dfe7 LT |
811 | INIT_LIST_HEAD(&mod->source_list); |
812 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 813 | |
1da177e4 | 814 | /* Hold reference count during initialization. */ |
e513cc1c | 815 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
816 | |
817 | return 0; | |
1da177e4 LT |
818 | } |
819 | ||
1da177e4 LT |
820 | /* Does a already use b? */ |
821 | static int already_uses(struct module *a, struct module *b) | |
822 | { | |
823 | struct module_use *use; | |
824 | ||
2c02dfe7 LT |
825 | list_for_each_entry(use, &b->source_list, source_list) { |
826 | if (use->source == a) { | |
5e124169 | 827 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
828 | return 1; |
829 | } | |
830 | } | |
5e124169 | 831 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
832 | return 0; |
833 | } | |
834 | ||
2c02dfe7 LT |
835 | /* |
836 | * Module a uses b | |
837 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
838 | * - the module_use is added to the list of 'b' sources (so | |
839 | * 'b' can walk the list to see who sourced them), and of 'a' | |
840 | * targets (so 'a' can see what modules it targets). | |
841 | */ | |
842 | static int add_module_usage(struct module *a, struct module *b) | |
843 | { | |
2c02dfe7 LT |
844 | struct module_use *use; |
845 | ||
5e124169 | 846 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 847 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 848 | if (!use) |
2c02dfe7 | 849 | return -ENOMEM; |
2c02dfe7 LT |
850 | |
851 | use->source = a; | |
852 | use->target = b; | |
853 | list_add(&use->source_list, &b->source_list); | |
854 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
855 | return 0; |
856 | } | |
857 | ||
75676500 | 858 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 859 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 860 | { |
c8e21ced | 861 | int err; |
270a6c4c | 862 | |
9bea7f23 | 863 | if (b == NULL || already_uses(a, b)) |
218ce735 | 864 | return 0; |
218ce735 | 865 | |
9bea7f23 RR |
866 | /* If module isn't available, we fail. */ |
867 | err = strong_try_module_get(b); | |
c9a3ba55 | 868 | if (err) |
9bea7f23 | 869 | return err; |
1da177e4 | 870 | |
2c02dfe7 LT |
871 | err = add_module_usage(a, b); |
872 | if (err) { | |
1da177e4 | 873 | module_put(b); |
9bea7f23 | 874 | return err; |
1da177e4 | 875 | } |
9bea7f23 | 876 | return 0; |
1da177e4 | 877 | } |
9bea7f23 | 878 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
879 | |
880 | /* Clear the unload stuff of the module. */ | |
881 | static void module_unload_free(struct module *mod) | |
882 | { | |
2c02dfe7 | 883 | struct module_use *use, *tmp; |
1da177e4 | 884 | |
75676500 | 885 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
886 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
887 | struct module *i = use->target; | |
5e124169 | 888 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
889 | module_put(i); |
890 | list_del(&use->source_list); | |
891 | list_del(&use->target_list); | |
892 | kfree(use); | |
1da177e4 | 893 | } |
75676500 | 894 | mutex_unlock(&module_mutex); |
1da177e4 LT |
895 | } |
896 | ||
897 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 898 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
899 | { |
900 | int ret = (flags & O_TRUNC); | |
901 | if (ret) | |
373d4d09 | 902 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
903 | return ret; |
904 | } | |
905 | #else | |
fb169793 | 906 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
907 | { |
908 | return 0; | |
909 | } | |
910 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
911 | ||
e513cc1c MH |
912 | /* Try to release refcount of module, 0 means success. */ |
913 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 914 | { |
e513cc1c | 915 | int ret; |
1da177e4 | 916 | |
e513cc1c MH |
917 | /* Try to decrement refcnt which we set at loading */ |
918 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
919 | BUG_ON(ret < 0); | |
920 | if (ret) | |
921 | /* Someone can put this right now, recover with checking */ | |
922 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 923 | |
e513cc1c MH |
924 | return ret; |
925 | } | |
1da177e4 | 926 | |
e513cc1c MH |
927 | static int try_stop_module(struct module *mod, int flags, int *forced) |
928 | { | |
da39ba5e | 929 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
930 | if (try_release_module_ref(mod) != 0) { |
931 | *forced = try_force_unload(flags); | |
932 | if (!(*forced)) | |
1da177e4 LT |
933 | return -EWOULDBLOCK; |
934 | } | |
935 | ||
936 | /* Mark it as dying. */ | |
e513cc1c | 937 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 938 | |
e513cc1c | 939 | return 0; |
1da177e4 LT |
940 | } |
941 | ||
d5db139a RR |
942 | /** |
943 | * module_refcount - return the refcount or -1 if unloading | |
944 | * | |
945 | * @mod: the module we're checking | |
946 | * | |
947 | * Returns: | |
948 | * -1 if the module is in the process of unloading | |
949 | * otherwise the number of references in the kernel to the module | |
950 | */ | |
951 | int module_refcount(struct module *mod) | |
1da177e4 | 952 | { |
d5db139a | 953 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
954 | } |
955 | EXPORT_SYMBOL(module_refcount); | |
956 | ||
957 | /* This exists whether we can unload or not */ | |
958 | static void free_module(struct module *mod); | |
959 | ||
17da2bd9 HC |
960 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
961 | unsigned int, flags) | |
1da177e4 LT |
962 | { |
963 | struct module *mod; | |
dfff0a06 | 964 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
965 | int ret, forced = 0; |
966 | ||
3d43321b | 967 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
968 | return -EPERM; |
969 | ||
970 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
971 | return -EFAULT; | |
972 | name[MODULE_NAME_LEN-1] = '\0'; | |
973 | ||
f6276ac9 RGB |
974 | audit_log_kern_module(name); |
975 | ||
3fc1f1e2 TH |
976 | if (mutex_lock_interruptible(&module_mutex) != 0) |
977 | return -EINTR; | |
1da177e4 LT |
978 | |
979 | mod = find_module(name); | |
980 | if (!mod) { | |
981 | ret = -ENOENT; | |
982 | goto out; | |
983 | } | |
984 | ||
2c02dfe7 | 985 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
986 | /* Other modules depend on us: get rid of them first. */ |
987 | ret = -EWOULDBLOCK; | |
988 | goto out; | |
989 | } | |
990 | ||
991 | /* Doing init or already dying? */ | |
992 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 993 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 994 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
995 | ret = -EBUSY; |
996 | goto out; | |
997 | } | |
998 | ||
999 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 1000 | if (mod->init && !mod->exit) { |
fb169793 | 1001 | forced = try_force_unload(flags); |
1da177e4 LT |
1002 | if (!forced) { |
1003 | /* This module can't be removed */ | |
1004 | ret = -EBUSY; | |
1005 | goto out; | |
1006 | } | |
1007 | } | |
1008 | ||
1da177e4 LT |
1009 | /* Stop the machine so refcounts can't move and disable module. */ |
1010 | ret = try_stop_module(mod, flags, &forced); | |
1011 | if (ret != 0) | |
1012 | goto out; | |
1013 | ||
df4b565e | 1014 | mutex_unlock(&module_mutex); |
25985edc | 1015 | /* Final destruction now no one is using it. */ |
df4b565e | 1016 | if (mod->exit != NULL) |
1da177e4 | 1017 | mod->exit(); |
df4b565e PO |
1018 | blocking_notifier_call_chain(&module_notify_list, |
1019 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1020 | klp_module_going(mod); |
7dcd182b JY |
1021 | ftrace_release_mod(mod); |
1022 | ||
22a9d645 | 1023 | async_synchronize_full(); |
75676500 | 1024 | |
e14af7ee | 1025 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1026 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1027 | |
75676500 RR |
1028 | free_module(mod); |
1029 | return 0; | |
1030 | out: | |
6389a385 | 1031 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1032 | return ret; |
1033 | } | |
1034 | ||
d1e99d7a | 1035 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1036 | { |
1037 | struct module_use *use; | |
1038 | int printed_something = 0; | |
1039 | ||
d5db139a | 1040 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1041 | |
6da0b565 IA |
1042 | /* |
1043 | * Always include a trailing , so userspace can differentiate | |
1044 | * between this and the old multi-field proc format. | |
1045 | */ | |
2c02dfe7 | 1046 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1047 | printed_something = 1; |
2c02dfe7 | 1048 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1049 | } |
1050 | ||
1da177e4 LT |
1051 | if (mod->init != NULL && mod->exit == NULL) { |
1052 | printed_something = 1; | |
6da0b565 | 1053 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | if (!printed_something) | |
6da0b565 | 1057 | seq_puts(m, "-"); |
1da177e4 LT |
1058 | } |
1059 | ||
1060 | void __symbol_put(const char *symbol) | |
1061 | { | |
1062 | struct module *owner; | |
1da177e4 | 1063 | |
24da1cbf | 1064 | preempt_disable(); |
414fd31b | 1065 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1066 | BUG(); |
1067 | module_put(owner); | |
24da1cbf | 1068 | preempt_enable(); |
1da177e4 LT |
1069 | } |
1070 | EXPORT_SYMBOL(__symbol_put); | |
1071 | ||
7d1d16e4 | 1072 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1073 | void symbol_put_addr(void *addr) |
1074 | { | |
5e376613 | 1075 | struct module *modaddr; |
7d1d16e4 | 1076 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1077 | |
7d1d16e4 | 1078 | if (core_kernel_text(a)) |
5e376613 | 1079 | return; |
1da177e4 | 1080 | |
275d7d44 PZ |
1081 | /* |
1082 | * Even though we hold a reference on the module; we still need to | |
1083 | * disable preemption in order to safely traverse the data structure. | |
1084 | */ | |
1085 | preempt_disable(); | |
7d1d16e4 | 1086 | modaddr = __module_text_address(a); |
a6e6abd5 | 1087 | BUG_ON(!modaddr); |
5e376613 | 1088 | module_put(modaddr); |
275d7d44 | 1089 | preempt_enable(); |
1da177e4 LT |
1090 | } |
1091 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1092 | ||
1093 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1094 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1095 | { |
d5db139a | 1096 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1097 | } |
1098 | ||
cca3e707 KS |
1099 | static struct module_attribute modinfo_refcnt = |
1100 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1101 | |
d53799be SR |
1102 | void __module_get(struct module *module) |
1103 | { | |
1104 | if (module) { | |
1105 | preempt_disable(); | |
2f35c41f | 1106 | atomic_inc(&module->refcnt); |
d53799be SR |
1107 | trace_module_get(module, _RET_IP_); |
1108 | preempt_enable(); | |
1109 | } | |
1110 | } | |
1111 | EXPORT_SYMBOL(__module_get); | |
1112 | ||
1113 | bool try_module_get(struct module *module) | |
1114 | { | |
1115 | bool ret = true; | |
1116 | ||
1117 | if (module) { | |
1118 | preempt_disable(); | |
e513cc1c MH |
1119 | /* Note: here, we can fail to get a reference */ |
1120 | if (likely(module_is_live(module) && | |
1121 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1122 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1123 | else |
d53799be SR |
1124 | ret = false; |
1125 | ||
1126 | preempt_enable(); | |
1127 | } | |
1128 | return ret; | |
1129 | } | |
1130 | EXPORT_SYMBOL(try_module_get); | |
1131 | ||
f6a57033 AV |
1132 | void module_put(struct module *module) |
1133 | { | |
e513cc1c MH |
1134 | int ret; |
1135 | ||
f6a57033 | 1136 | if (module) { |
e1783a24 | 1137 | preempt_disable(); |
e513cc1c MH |
1138 | ret = atomic_dec_if_positive(&module->refcnt); |
1139 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1140 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1141 | preempt_enable(); |
f6a57033 AV |
1142 | } |
1143 | } | |
1144 | EXPORT_SYMBOL(module_put); | |
1145 | ||
1da177e4 | 1146 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1147 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1148 | { |
1149 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1150 | seq_puts(m, " - -"); |
1da177e4 LT |
1151 | } |
1152 | ||
1153 | static inline void module_unload_free(struct module *mod) | |
1154 | { | |
1155 | } | |
1156 | ||
9bea7f23 | 1157 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1158 | { |
9bea7f23 | 1159 | return strong_try_module_get(b); |
1da177e4 | 1160 | } |
9bea7f23 | 1161 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1162 | |
9f85a4bb | 1163 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1164 | { |
9f85a4bb | 1165 | return 0; |
1da177e4 LT |
1166 | } |
1167 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1168 | ||
53999bf3 KW |
1169 | static size_t module_flags_taint(struct module *mod, char *buf) |
1170 | { | |
1171 | size_t l = 0; | |
7fd8329b PM |
1172 | int i; |
1173 | ||
1174 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1175 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1176 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1177 | } |
53999bf3 | 1178 | |
53999bf3 KW |
1179 | return l; |
1180 | } | |
1181 | ||
1f71740a | 1182 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1183 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1184 | { |
1185 | const char *state = "unknown"; | |
1186 | ||
4befb026 | 1187 | switch (mk->mod->state) { |
1f71740a KS |
1188 | case MODULE_STATE_LIVE: |
1189 | state = "live"; | |
1190 | break; | |
1191 | case MODULE_STATE_COMING: | |
1192 | state = "coming"; | |
1193 | break; | |
1194 | case MODULE_STATE_GOING: | |
1195 | state = "going"; | |
1196 | break; | |
0d21b0e3 RR |
1197 | default: |
1198 | BUG(); | |
1f71740a KS |
1199 | } |
1200 | return sprintf(buffer, "%s\n", state); | |
1201 | } | |
1202 | ||
cca3e707 KS |
1203 | static struct module_attribute modinfo_initstate = |
1204 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1205 | |
88bfa324 KS |
1206 | static ssize_t store_uevent(struct module_attribute *mattr, |
1207 | struct module_kobject *mk, | |
1208 | const char *buffer, size_t count) | |
1209 | { | |
f36776fa | 1210 | kobject_synth_uevent(&mk->kobj, buffer, count); |
88bfa324 KS |
1211 | return count; |
1212 | } | |
1213 | ||
cca3e707 KS |
1214 | struct module_attribute module_uevent = |
1215 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1216 | ||
1217 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1218 | struct module_kobject *mk, char *buffer) | |
1219 | { | |
7523e4dc | 1220 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1221 | } |
1222 | ||
1223 | static struct module_attribute modinfo_coresize = | |
1224 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1225 | ||
1226 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1227 | struct module_kobject *mk, char *buffer) | |
1228 | { | |
7523e4dc | 1229 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1230 | } |
1231 | ||
1232 | static struct module_attribute modinfo_initsize = | |
1233 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1234 | ||
1235 | static ssize_t show_taint(struct module_attribute *mattr, | |
1236 | struct module_kobject *mk, char *buffer) | |
1237 | { | |
1238 | size_t l; | |
1239 | ||
1240 | l = module_flags_taint(mk->mod, buffer); | |
1241 | buffer[l++] = '\n'; | |
1242 | return l; | |
1243 | } | |
1244 | ||
1245 | static struct module_attribute modinfo_taint = | |
1246 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1247 | |
03e88ae1 | 1248 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1249 | &module_uevent, |
03e88ae1 GKH |
1250 | &modinfo_version, |
1251 | &modinfo_srcversion, | |
cca3e707 KS |
1252 | &modinfo_initstate, |
1253 | &modinfo_coresize, | |
1254 | &modinfo_initsize, | |
1255 | &modinfo_taint, | |
03e88ae1 | 1256 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1257 | &modinfo_refcnt, |
03e88ae1 GKH |
1258 | #endif |
1259 | NULL, | |
1260 | }; | |
1261 | ||
1da177e4 LT |
1262 | static const char vermagic[] = VERMAGIC_STRING; |
1263 | ||
c6e665c8 | 1264 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1265 | { |
1266 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1267 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1268 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1269 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1270 | return 0; |
1271 | #else | |
1272 | return -ENOEXEC; | |
1273 | #endif | |
1274 | } | |
1275 | ||
1da177e4 | 1276 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1277 | |
1278 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1279 | { |
71810db2 | 1280 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1281 | } |
1282 | ||
49019426 | 1283 | static int check_version(const struct load_info *info, |
1da177e4 | 1284 | const char *symname, |
6da0b565 | 1285 | struct module *mod, |
71810db2 | 1286 | const s32 *crc) |
1da177e4 | 1287 | { |
49019426 KC |
1288 | Elf_Shdr *sechdrs = info->sechdrs; |
1289 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1290 | unsigned int i, num_versions; |
1291 | struct modversion_info *versions; | |
1292 | ||
1293 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1294 | if (!crc) | |
1295 | return 1; | |
1296 | ||
a5dd6970 RR |
1297 | /* No versions at all? modprobe --force does this. */ |
1298 | if (versindex == 0) | |
1299 | return try_to_force_load(mod, symname) == 0; | |
1300 | ||
1da177e4 LT |
1301 | versions = (void *) sechdrs[versindex].sh_addr; |
1302 | num_versions = sechdrs[versindex].sh_size | |
1303 | / sizeof(struct modversion_info); | |
1304 | ||
1305 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1306 | u32 crcval; |
1307 | ||
1da177e4 LT |
1308 | if (strcmp(versions[i].name, symname) != 0) |
1309 | continue; | |
1310 | ||
71810db2 AB |
1311 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1312 | crcval = resolve_rel_crc(crc); | |
1313 | else | |
1314 | crcval = *crc; | |
1315 | if (versions[i].crc == crcval) | |
1da177e4 | 1316 | return 1; |
71810db2 AB |
1317 | pr_debug("Found checksum %X vs module %lX\n", |
1318 | crcval, versions[i].crc); | |
826e4506 | 1319 | goto bad_version; |
1da177e4 | 1320 | } |
826e4506 | 1321 | |
faaae2a5 | 1322 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1323 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1324 | return 1; |
826e4506 LT |
1325 | |
1326 | bad_version: | |
6da0b565 | 1327 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1328 | info->name, symname); |
826e4506 | 1329 | return 0; |
1da177e4 LT |
1330 | } |
1331 | ||
49019426 | 1332 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1333 | struct module *mod) |
1334 | { | |
71810db2 | 1335 | const s32 *crc; |
1da177e4 | 1336 | |
926a59b1 PZ |
1337 | /* |
1338 | * Since this should be found in kernel (which can't be removed), no | |
1339 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1340 | */ | |
1341 | preempt_disable(); | |
b92021b0 | 1342 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
926a59b1 PZ |
1343 | &crc, true, false)) { |
1344 | preempt_enable(); | |
1da177e4 | 1345 | BUG(); |
926a59b1 PZ |
1346 | } |
1347 | preempt_enable(); | |
49019426 KC |
1348 | return check_version(info, VMLINUX_SYMBOL_STR(module_layout), |
1349 | mod, crc); | |
1da177e4 LT |
1350 | } |
1351 | ||
91e37a79 RR |
1352 | /* First part is kernel version, which we ignore if module has crcs. */ |
1353 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1354 | bool has_crcs) | |
1da177e4 | 1355 | { |
91e37a79 RR |
1356 | if (has_crcs) { |
1357 | amagic += strcspn(amagic, " "); | |
1358 | bmagic += strcspn(bmagic, " "); | |
1359 | } | |
1da177e4 LT |
1360 | return strcmp(amagic, bmagic) == 0; |
1361 | } | |
1362 | #else | |
49019426 | 1363 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1364 | const char *symname, |
6da0b565 | 1365 | struct module *mod, |
71810db2 | 1366 | const s32 *crc) |
1da177e4 LT |
1367 | { |
1368 | return 1; | |
1369 | } | |
1370 | ||
49019426 | 1371 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1372 | struct module *mod) |
1373 | { | |
1374 | return 1; | |
1375 | } | |
1376 | ||
91e37a79 RR |
1377 | static inline int same_magic(const char *amagic, const char *bmagic, |
1378 | bool has_crcs) | |
1da177e4 LT |
1379 | { |
1380 | return strcmp(amagic, bmagic) == 0; | |
1381 | } | |
1382 | #endif /* CONFIG_MODVERSIONS */ | |
1383 | ||
75676500 | 1384 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1385 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1386 | const struct load_info *info, | |
414fd31b | 1387 | const char *name, |
9bea7f23 | 1388 | char ownername[]) |
1da177e4 LT |
1389 | { |
1390 | struct module *owner; | |
414fd31b | 1391 | const struct kernel_symbol *sym; |
71810db2 | 1392 | const s32 *crc; |
9bea7f23 | 1393 | int err; |
1da177e4 | 1394 | |
d64810f5 PZ |
1395 | /* |
1396 | * The module_mutex should not be a heavily contended lock; | |
1397 | * if we get the occasional sleep here, we'll go an extra iteration | |
1398 | * in the wait_event_interruptible(), which is harmless. | |
1399 | */ | |
1400 | sched_annotate_sleep(); | |
75676500 | 1401 | mutex_lock(&module_mutex); |
414fd31b | 1402 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1403 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1404 | if (!sym) |
1405 | goto unlock; | |
1406 | ||
49019426 | 1407 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1408 | sym = ERR_PTR(-EINVAL); |
1409 | goto getname; | |
1da177e4 | 1410 | } |
9bea7f23 RR |
1411 | |
1412 | err = ref_module(mod, owner); | |
1413 | if (err) { | |
1414 | sym = ERR_PTR(err); | |
1415 | goto getname; | |
1416 | } | |
1417 | ||
1418 | getname: | |
1419 | /* We must make copy under the lock if we failed to get ref. */ | |
1420 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1421 | unlock: | |
75676500 | 1422 | mutex_unlock(&module_mutex); |
218ce735 | 1423 | return sym; |
1da177e4 LT |
1424 | } |
1425 | ||
49668688 RR |
1426 | static const struct kernel_symbol * |
1427 | resolve_symbol_wait(struct module *mod, | |
1428 | const struct load_info *info, | |
1429 | const char *name) | |
9bea7f23 RR |
1430 | { |
1431 | const struct kernel_symbol *ksym; | |
49668688 | 1432 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1433 | |
1434 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1435 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1436 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1437 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1438 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1439 | mod->name, owner); | |
9bea7f23 RR |
1440 | } |
1441 | return ksym; | |
1442 | } | |
1443 | ||
1da177e4 LT |
1444 | /* |
1445 | * /sys/module/foo/sections stuff | |
1446 | * J. Corbet <corbet@lwn.net> | |
1447 | */ | |
8f6d0378 | 1448 | #ifdef CONFIG_SYSFS |
10b465aa | 1449 | |
8f6d0378 | 1450 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1451 | static inline bool sect_empty(const Elf_Shdr *sect) |
1452 | { | |
1453 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1454 | } | |
1455 | ||
6da0b565 | 1456 | struct module_sect_attr { |
a58730c4 RR |
1457 | struct module_attribute mattr; |
1458 | char *name; | |
1459 | unsigned long address; | |
1460 | }; | |
1461 | ||
6da0b565 | 1462 | struct module_sect_attrs { |
a58730c4 RR |
1463 | struct attribute_group grp; |
1464 | unsigned int nsections; | |
1465 | struct module_sect_attr attrs[0]; | |
1466 | }; | |
1467 | ||
1da177e4 | 1468 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1469 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1470 | { |
1471 | struct module_sect_attr *sattr = | |
1472 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1473 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1474 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1475 | } |
1476 | ||
04b1db9f IN |
1477 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1478 | { | |
a58730c4 | 1479 | unsigned int section; |
04b1db9f IN |
1480 | |
1481 | for (section = 0; section < sect_attrs->nsections; section++) | |
1482 | kfree(sect_attrs->attrs[section].name); | |
1483 | kfree(sect_attrs); | |
1484 | } | |
1485 | ||
8f6d0378 | 1486 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1487 | { |
1488 | unsigned int nloaded = 0, i, size[2]; | |
1489 | struct module_sect_attrs *sect_attrs; | |
1490 | struct module_sect_attr *sattr; | |
1491 | struct attribute **gattr; | |
22a8bdeb | 1492 | |
1da177e4 | 1493 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1494 | for (i = 0; i < info->hdr->e_shnum; i++) |
1495 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1496 | nloaded++; |
1497 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1498 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1499 | sizeof(sect_attrs->grp.attrs[0])); | |
1500 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1501 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1502 | if (sect_attrs == NULL) | |
1da177e4 LT |
1503 | return; |
1504 | ||
1505 | /* Setup section attributes. */ | |
1506 | sect_attrs->grp.name = "sections"; | |
1507 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1508 | ||
04b1db9f | 1509 | sect_attrs->nsections = 0; |
1da177e4 LT |
1510 | sattr = §_attrs->attrs[0]; |
1511 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1512 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1513 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1514 | if (sect_empty(sec)) | |
35dead42 | 1515 | continue; |
8f6d0378 RR |
1516 | sattr->address = sec->sh_addr; |
1517 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1518 | GFP_KERNEL); |
1519 | if (sattr->name == NULL) | |
1520 | goto out; | |
1521 | sect_attrs->nsections++; | |
361795b1 | 1522 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1523 | sattr->mattr.show = module_sect_show; |
1524 | sattr->mattr.store = NULL; | |
1525 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1526 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1527 | *(gattr++) = &(sattr++)->mattr.attr; |
1528 | } | |
1529 | *gattr = NULL; | |
1530 | ||
1531 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1532 | goto out; | |
1533 | ||
1534 | mod->sect_attrs = sect_attrs; | |
1535 | return; | |
1536 | out: | |
04b1db9f | 1537 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1538 | } |
1539 | ||
1540 | static void remove_sect_attrs(struct module *mod) | |
1541 | { | |
1542 | if (mod->sect_attrs) { | |
1543 | sysfs_remove_group(&mod->mkobj.kobj, | |
1544 | &mod->sect_attrs->grp); | |
1545 | /* We are positive that no one is using any sect attrs | |
1546 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1547 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1548 | mod->sect_attrs = NULL; |
1549 | } | |
1550 | } | |
1551 | ||
6d760133 RM |
1552 | /* |
1553 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1554 | */ | |
1555 | ||
1556 | struct module_notes_attrs { | |
1557 | struct kobject *dir; | |
1558 | unsigned int notes; | |
1559 | struct bin_attribute attrs[0]; | |
1560 | }; | |
1561 | ||
2c3c8bea | 1562 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1563 | struct bin_attribute *bin_attr, |
1564 | char *buf, loff_t pos, size_t count) | |
1565 | { | |
1566 | /* | |
1567 | * The caller checked the pos and count against our size. | |
1568 | */ | |
1569 | memcpy(buf, bin_attr->private + pos, count); | |
1570 | return count; | |
1571 | } | |
1572 | ||
1573 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1574 | unsigned int i) | |
1575 | { | |
1576 | if (notes_attrs->dir) { | |
1577 | while (i-- > 0) | |
1578 | sysfs_remove_bin_file(notes_attrs->dir, | |
1579 | ¬es_attrs->attrs[i]); | |
e9432093 | 1580 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1581 | } |
1582 | kfree(notes_attrs); | |
1583 | } | |
1584 | ||
8f6d0378 | 1585 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1586 | { |
1587 | unsigned int notes, loaded, i; | |
1588 | struct module_notes_attrs *notes_attrs; | |
1589 | struct bin_attribute *nattr; | |
1590 | ||
ea6bff36 IM |
1591 | /* failed to create section attributes, so can't create notes */ |
1592 | if (!mod->sect_attrs) | |
1593 | return; | |
1594 | ||
6d760133 RM |
1595 | /* Count notes sections and allocate structures. */ |
1596 | notes = 0; | |
8f6d0378 RR |
1597 | for (i = 0; i < info->hdr->e_shnum; i++) |
1598 | if (!sect_empty(&info->sechdrs[i]) && | |
1599 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1600 | ++notes; |
1601 | ||
1602 | if (notes == 0) | |
1603 | return; | |
1604 | ||
acafe7e3 | 1605 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1606 | GFP_KERNEL); |
1607 | if (notes_attrs == NULL) | |
1608 | return; | |
1609 | ||
1610 | notes_attrs->notes = notes; | |
1611 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1612 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1613 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1614 | continue; |
8f6d0378 | 1615 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1616 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1617 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1618 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1619 | nattr->size = info->sechdrs[i].sh_size; |
1620 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1621 | nattr->read = module_notes_read; |
1622 | ++nattr; | |
1623 | } | |
1624 | ++loaded; | |
1625 | } | |
1626 | ||
4ff6abff | 1627 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1628 | if (!notes_attrs->dir) |
1629 | goto out; | |
1630 | ||
1631 | for (i = 0; i < notes; ++i) | |
1632 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1633 | ¬es_attrs->attrs[i])) | |
1634 | goto out; | |
1635 | ||
1636 | mod->notes_attrs = notes_attrs; | |
1637 | return; | |
1638 | ||
1639 | out: | |
1640 | free_notes_attrs(notes_attrs, i); | |
1641 | } | |
1642 | ||
1643 | static void remove_notes_attrs(struct module *mod) | |
1644 | { | |
1645 | if (mod->notes_attrs) | |
1646 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1647 | } | |
1648 | ||
1da177e4 | 1649 | #else |
04b1db9f | 1650 | |
8f6d0378 RR |
1651 | static inline void add_sect_attrs(struct module *mod, |
1652 | const struct load_info *info) | |
1da177e4 LT |
1653 | { |
1654 | } | |
1655 | ||
1656 | static inline void remove_sect_attrs(struct module *mod) | |
1657 | { | |
1658 | } | |
6d760133 | 1659 | |
8f6d0378 RR |
1660 | static inline void add_notes_attrs(struct module *mod, |
1661 | const struct load_info *info) | |
6d760133 RM |
1662 | { |
1663 | } | |
1664 | ||
1665 | static inline void remove_notes_attrs(struct module *mod) | |
1666 | { | |
1667 | } | |
8f6d0378 | 1668 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1669 | |
1ba5c08b | 1670 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1671 | { |
1672 | #ifdef CONFIG_MODULE_UNLOAD | |
1673 | struct module_use *use; | |
80a3d1bb | 1674 | |
75676500 | 1675 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1676 | list_for_each_entry(use, &mod->target_list, target_list) |
1677 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1678 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1679 | #endif |
1680 | } | |
1681 | ||
1ba5c08b | 1682 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1683 | { |
1ba5c08b | 1684 | int ret = 0; |
80a3d1bb RR |
1685 | #ifdef CONFIG_MODULE_UNLOAD |
1686 | struct module_use *use; | |
1687 | ||
75676500 | 1688 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1689 | list_for_each_entry(use, &mod->target_list, target_list) { |
1690 | ret = sysfs_create_link(use->target->holders_dir, | |
1691 | &mod->mkobj.kobj, mod->name); | |
1692 | if (ret) | |
1693 | break; | |
1694 | } | |
75676500 | 1695 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1696 | if (ret) |
1697 | del_usage_links(mod); | |
80a3d1bb | 1698 | #endif |
1ba5c08b | 1699 | return ret; |
80a3d1bb RR |
1700 | } |
1701 | ||
6407ebb2 | 1702 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1703 | { |
1704 | struct module_attribute *attr; | |
03e88ae1 | 1705 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1706 | int error = 0; |
1707 | int i; | |
1708 | ||
03e88ae1 GKH |
1709 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1710 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1711 | GFP_KERNEL); | |
1712 | if (!mod->modinfo_attrs) | |
1713 | return -ENOMEM; | |
1714 | ||
1715 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 | 1716 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
c75b590d | 1717 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1718 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1719 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1720 | error = sysfs_create_file(&mod->mkobj.kobj, |
1721 | &temp_attr->attr); | |
03e88ae1 GKH |
1722 | ++temp_attr; |
1723 | } | |
c988d2b2 MD |
1724 | } |
1725 | return error; | |
1726 | } | |
1727 | ||
6407ebb2 | 1728 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1729 | { |
1730 | struct module_attribute *attr; | |
1731 | int i; | |
1732 | ||
03e88ae1 GKH |
1733 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1734 | /* pick a field to test for end of list */ | |
1735 | if (!attr->attr.name) | |
1736 | break; | |
6da0b565 | 1737 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1738 | if (attr->free) |
1739 | attr->free(mod); | |
c988d2b2 | 1740 | } |
03e88ae1 | 1741 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1742 | } |
1da177e4 | 1743 | |
942e4431 LZ |
1744 | static void mod_kobject_put(struct module *mod) |
1745 | { | |
1746 | DECLARE_COMPLETION_ONSTACK(c); | |
1747 | mod->mkobj.kobj_completion = &c; | |
1748 | kobject_put(&mod->mkobj.kobj); | |
1749 | wait_for_completion(&c); | |
1750 | } | |
1751 | ||
6407ebb2 | 1752 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1753 | { |
1754 | int err; | |
6494a93d | 1755 | struct kobject *kobj; |
1da177e4 | 1756 | |
823bccfc | 1757 | if (!module_sysfs_initialized) { |
bddb12b3 | 1758 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1759 | err = -EINVAL; |
1760 | goto out; | |
1761 | } | |
6494a93d GKH |
1762 | |
1763 | kobj = kset_find_obj(module_kset, mod->name); | |
1764 | if (kobj) { | |
bddb12b3 | 1765 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1766 | kobject_put(kobj); |
1767 | err = -EINVAL; | |
1768 | goto out; | |
1769 | } | |
1770 | ||
1da177e4 | 1771 | mod->mkobj.mod = mod; |
e17e0f51 | 1772 | |
ac3c8141 GKH |
1773 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1774 | mod->mkobj.kobj.kset = module_kset; | |
1775 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1776 | "%s", mod->name); | |
1777 | if (err) | |
942e4431 | 1778 | mod_kobject_put(mod); |
270a6c4c | 1779 | |
97c146ef | 1780 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1781 | out: |
1782 | return err; | |
1783 | } | |
1784 | ||
6407ebb2 | 1785 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1786 | const struct load_info *info, |
270a6c4c KS |
1787 | struct kernel_param *kparam, |
1788 | unsigned int num_params) | |
1789 | { | |
1790 | int err; | |
1791 | ||
80a3d1bb RR |
1792 | err = mod_sysfs_init(mod); |
1793 | if (err) | |
1794 | goto out; | |
1795 | ||
4ff6abff | 1796 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1797 | if (!mod->holders_dir) { |
1798 | err = -ENOMEM; | |
270a6c4c | 1799 | goto out_unreg; |
240936e1 | 1800 | } |
270a6c4c | 1801 | |
1da177e4 LT |
1802 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1803 | if (err) | |
270a6c4c | 1804 | goto out_unreg_holders; |
1da177e4 | 1805 | |
c988d2b2 MD |
1806 | err = module_add_modinfo_attrs(mod); |
1807 | if (err) | |
e17e0f51 | 1808 | goto out_unreg_param; |
c988d2b2 | 1809 | |
1ba5c08b CL |
1810 | err = add_usage_links(mod); |
1811 | if (err) | |
1812 | goto out_unreg_modinfo_attrs; | |
1813 | ||
8f6d0378 RR |
1814 | add_sect_attrs(mod, info); |
1815 | add_notes_attrs(mod, info); | |
80a3d1bb | 1816 | |
e17e0f51 | 1817 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1818 | return 0; |
1819 | ||
1ba5c08b CL |
1820 | out_unreg_modinfo_attrs: |
1821 | module_remove_modinfo_attrs(mod); | |
e17e0f51 KS |
1822 | out_unreg_param: |
1823 | module_param_sysfs_remove(mod); | |
270a6c4c | 1824 | out_unreg_holders: |
78a2d906 | 1825 | kobject_put(mod->holders_dir); |
270a6c4c | 1826 | out_unreg: |
942e4431 | 1827 | mod_kobject_put(mod); |
80a3d1bb | 1828 | out: |
1da177e4 LT |
1829 | return err; |
1830 | } | |
34e4e2fe DL |
1831 | |
1832 | static void mod_sysfs_fini(struct module *mod) | |
1833 | { | |
8f6d0378 RR |
1834 | remove_notes_attrs(mod); |
1835 | remove_sect_attrs(mod); | |
942e4431 | 1836 | mod_kobject_put(mod); |
34e4e2fe DL |
1837 | } |
1838 | ||
cf2fde7b RR |
1839 | static void init_param_lock(struct module *mod) |
1840 | { | |
1841 | mutex_init(&mod->param_lock); | |
1842 | } | |
8f6d0378 | 1843 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1844 | |
8f6d0378 RR |
1845 | static int mod_sysfs_setup(struct module *mod, |
1846 | const struct load_info *info, | |
6407ebb2 RR |
1847 | struct kernel_param *kparam, |
1848 | unsigned int num_params) | |
1849 | { | |
1850 | return 0; | |
1851 | } | |
1852 | ||
34e4e2fe DL |
1853 | static void mod_sysfs_fini(struct module *mod) |
1854 | { | |
1855 | } | |
1856 | ||
36b0360d RR |
1857 | static void module_remove_modinfo_attrs(struct module *mod) |
1858 | { | |
1859 | } | |
1860 | ||
80a3d1bb RR |
1861 | static void del_usage_links(struct module *mod) |
1862 | { | |
1863 | } | |
1864 | ||
cf2fde7b RR |
1865 | static void init_param_lock(struct module *mod) |
1866 | { | |
1867 | } | |
34e4e2fe | 1868 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1869 | |
36b0360d | 1870 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1871 | { |
80a3d1bb | 1872 | del_usage_links(mod); |
c988d2b2 | 1873 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1874 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1875 | kobject_put(mod->mkobj.drivers_dir); |
1876 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1877 | mod_sysfs_fini(mod); |
1da177e4 LT |
1878 | } |
1879 | ||
0f5bf6d0 | 1880 | #ifdef CONFIG_STRICT_MODULE_RWX |
84e1c6bb MC |
1881 | /* |
1882 | * LKM RO/NX protection: protect module's text/ro-data | |
1883 | * from modification and any data from execution. | |
85c898db RR |
1884 | * |
1885 | * General layout of module is: | |
444d13ff JY |
1886 | * [text] [read-only-data] [ro-after-init] [writable data] |
1887 | * text_size -----^ ^ ^ ^ | |
1888 | * ro_size ------------------------| | | | |
1889 | * ro_after_init_size -----------------------------| | | |
1890 | * size -----------------------------------------------------------| | |
85c898db RR |
1891 | * |
1892 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1893 | */ |
85c898db RR |
1894 | static void frob_text(const struct module_layout *layout, |
1895 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1896 | { |
85c898db RR |
1897 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1898 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1899 | set_memory((unsigned long)layout->base, | |
1900 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1901 | } |
84e1c6bb | 1902 | |
85c898db RR |
1903 | static void frob_rodata(const struct module_layout *layout, |
1904 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1905 | { |
85c898db RR |
1906 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1907 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1908 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1909 | set_memory((unsigned long)layout->base + layout->text_size, | |
1910 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1911 | } |
1912 | ||
444d13ff JY |
1913 | static void frob_ro_after_init(const struct module_layout *layout, |
1914 | int (*set_memory)(unsigned long start, int num_pages)) | |
1915 | { | |
1916 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1917 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1918 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1919 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1920 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1921 | } | |
1922 | ||
85c898db RR |
1923 | static void frob_writable_data(const struct module_layout *layout, |
1924 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1925 | { |
85c898db | 1926 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1927 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1928 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1929 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1930 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1931 | } |
84e1c6bb | 1932 | |
85c898db RR |
1933 | /* livepatching wants to disable read-only so it can frob module. */ |
1934 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1935 | { |
39290b38 AT |
1936 | if (!rodata_enabled) |
1937 | return; | |
1938 | ||
85c898db RR |
1939 | frob_text(&mod->core_layout, set_memory_rw); |
1940 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 1941 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
1942 | frob_text(&mod->init_layout, set_memory_rw); |
1943 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1944 | } |
84e1c6bb | 1945 | |
444d13ff | 1946 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 1947 | { |
39290b38 AT |
1948 | if (!rodata_enabled) |
1949 | return; | |
1950 | ||
85c898db RR |
1951 | frob_text(&mod->core_layout, set_memory_ro); |
1952 | frob_rodata(&mod->core_layout, set_memory_ro); | |
1953 | frob_text(&mod->init_layout, set_memory_ro); | |
1954 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
1955 | |
1956 | if (after_init) | |
1957 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
1958 | } |
1959 | ||
85c898db | 1960 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 1961 | { |
85c898db | 1962 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 1963 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
1964 | frob_writable_data(&mod->core_layout, set_memory_nx); |
1965 | frob_rodata(&mod->init_layout, set_memory_nx); | |
1966 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
1967 | } |
1968 | ||
85c898db | 1969 | static void module_disable_nx(const struct module *mod) |
01526ed0 | 1970 | { |
85c898db | 1971 | frob_rodata(&mod->core_layout, set_memory_x); |
444d13ff | 1972 | frob_ro_after_init(&mod->core_layout, set_memory_x); |
85c898db RR |
1973 | frob_writable_data(&mod->core_layout, set_memory_x); |
1974 | frob_rodata(&mod->init_layout, set_memory_x); | |
1975 | frob_writable_data(&mod->init_layout, set_memory_x); | |
84e1c6bb MC |
1976 | } |
1977 | ||
1978 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1979 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
1980 | { |
1981 | struct module *mod; | |
1982 | ||
39290b38 AT |
1983 | if (!rodata_enabled) |
1984 | return; | |
1985 | ||
84e1c6bb MC |
1986 | mutex_lock(&module_mutex); |
1987 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1988 | if (mod->state == MODULE_STATE_UNFORMED) |
1989 | continue; | |
85c898db RR |
1990 | |
1991 | frob_text(&mod->core_layout, set_memory_rw); | |
1992 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb MC |
1993 | } |
1994 | mutex_unlock(&module_mutex); | |
1995 | } | |
1996 | ||
1997 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1998 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
1999 | { |
2000 | struct module *mod; | |
2001 | ||
39290b38 AT |
2002 | if (!rodata_enabled) |
2003 | return; | |
2004 | ||
84e1c6bb MC |
2005 | mutex_lock(&module_mutex); |
2006 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
2007 | /* |
2008 | * Ignore going modules since it's possible that ro | |
2009 | * protection has already been disabled, otherwise we'll | |
2010 | * run into protection faults at module deallocation. | |
2011 | */ | |
2012 | if (mod->state == MODULE_STATE_UNFORMED || | |
2013 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 2014 | continue; |
85c898db RR |
2015 | |
2016 | frob_text(&mod->core_layout, set_memory_ro); | |
2017 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb MC |
2018 | } |
2019 | mutex_unlock(&module_mutex); | |
2020 | } | |
85c898db RR |
2021 | |
2022 | static void disable_ro_nx(const struct module_layout *layout) | |
2023 | { | |
39290b38 AT |
2024 | if (rodata_enabled) { |
2025 | frob_text(layout, set_memory_rw); | |
2026 | frob_rodata(layout, set_memory_rw); | |
2027 | frob_ro_after_init(layout, set_memory_rw); | |
2028 | } | |
85c898db | 2029 | frob_rodata(layout, set_memory_x); |
444d13ff | 2030 | frob_ro_after_init(layout, set_memory_x); |
85c898db RR |
2031 | frob_writable_data(layout, set_memory_x); |
2032 | } | |
2033 | ||
84e1c6bb | 2034 | #else |
85c898db RR |
2035 | static void disable_ro_nx(const struct module_layout *layout) { } |
2036 | static void module_enable_nx(const struct module *mod) { } | |
2037 | static void module_disable_nx(const struct module *mod) { } | |
84e1c6bb MC |
2038 | #endif |
2039 | ||
1ce15ef4 JY |
2040 | #ifdef CONFIG_LIVEPATCH |
2041 | /* | |
2042 | * Persist Elf information about a module. Copy the Elf header, | |
2043 | * section header table, section string table, and symtab section | |
2044 | * index from info to mod->klp_info. | |
2045 | */ | |
2046 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2047 | { | |
2048 | unsigned int size, symndx; | |
2049 | int ret; | |
2050 | ||
2051 | size = sizeof(*mod->klp_info); | |
2052 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2053 | if (mod->klp_info == NULL) | |
2054 | return -ENOMEM; | |
2055 | ||
2056 | /* Elf header */ | |
2057 | size = sizeof(mod->klp_info->hdr); | |
2058 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2059 | ||
2060 | /* Elf section header table */ | |
2061 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
2062 | mod->klp_info->sechdrs = kmalloc(size, GFP_KERNEL); | |
2063 | if (mod->klp_info->sechdrs == NULL) { | |
2064 | ret = -ENOMEM; | |
2065 | goto free_info; | |
2066 | } | |
2067 | memcpy(mod->klp_info->sechdrs, info->sechdrs, size); | |
2068 | ||
2069 | /* Elf section name string table */ | |
2070 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
2071 | mod->klp_info->secstrings = kmalloc(size, GFP_KERNEL); | |
2072 | if (mod->klp_info->secstrings == NULL) { | |
2073 | ret = -ENOMEM; | |
2074 | goto free_sechdrs; | |
2075 | } | |
2076 | memcpy(mod->klp_info->secstrings, info->secstrings, size); | |
2077 | ||
2078 | /* Elf symbol section index */ | |
2079 | symndx = info->index.sym; | |
2080 | mod->klp_info->symndx = symndx; | |
2081 | ||
2082 | /* | |
2083 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2084 | * copy of the original symbol table. Adjust sh_addr to point | |
2085 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2086 | * init memory is freed at the end of do_init_module(). | |
2087 | */ | |
2088 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2089 | (unsigned long) mod->core_kallsyms.symtab; | |
2090 | ||
2091 | return 0; | |
2092 | ||
2093 | free_sechdrs: | |
2094 | kfree(mod->klp_info->sechdrs); | |
2095 | free_info: | |
2096 | kfree(mod->klp_info); | |
2097 | return ret; | |
2098 | } | |
2099 | ||
2100 | static void free_module_elf(struct module *mod) | |
2101 | { | |
2102 | kfree(mod->klp_info->sechdrs); | |
2103 | kfree(mod->klp_info->secstrings); | |
2104 | kfree(mod->klp_info); | |
2105 | } | |
2106 | #else /* !CONFIG_LIVEPATCH */ | |
2107 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2108 | { | |
2109 | return 0; | |
2110 | } | |
2111 | ||
2112 | static void free_module_elf(struct module *mod) | |
2113 | { | |
2114 | } | |
2115 | #endif /* CONFIG_LIVEPATCH */ | |
2116 | ||
be1f221c | 2117 | void __weak module_memfree(void *module_region) |
74e08fcf JB |
2118 | { |
2119 | vfree(module_region); | |
2120 | } | |
2121 | ||
2122 | void __weak module_arch_cleanup(struct module *mod) | |
2123 | { | |
2124 | } | |
2125 | ||
d453cded RR |
2126 | void __weak module_arch_freeing_init(struct module *mod) |
2127 | { | |
2128 | } | |
2129 | ||
75676500 | 2130 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2131 | static void free_module(struct module *mod) |
2132 | { | |
7ead8b83 LZ |
2133 | trace_module_free(mod); |
2134 | ||
36b0360d | 2135 | mod_sysfs_teardown(mod); |
1da177e4 | 2136 | |
944a1fa0 RR |
2137 | /* We leave it in list to prevent duplicate loads, but make sure |
2138 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2139 | mutex_lock(&module_mutex); |
944a1fa0 | 2140 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2141 | mutex_unlock(&module_mutex); |
944a1fa0 | 2142 | |
b82bab4b JB |
2143 | /* Remove dynamic debug info */ |
2144 | ddebug_remove_module(mod->name); | |
2145 | ||
1da177e4 LT |
2146 | /* Arch-specific cleanup. */ |
2147 | module_arch_cleanup(mod); | |
2148 | ||
2149 | /* Module unload stuff */ | |
2150 | module_unload_free(mod); | |
2151 | ||
e180a6b7 RR |
2152 | /* Free any allocated parameters. */ |
2153 | destroy_params(mod->kp, mod->num_kp); | |
2154 | ||
1ce15ef4 JY |
2155 | if (is_livepatch_module(mod)) |
2156 | free_module_elf(mod); | |
2157 | ||
944a1fa0 RR |
2158 | /* Now we can delete it from the lists */ |
2159 | mutex_lock(&module_mutex); | |
461e34ae MH |
2160 | /* Unlink carefully: kallsyms could be walking list. */ |
2161 | list_del_rcu(&mod->list); | |
93c2e105 | 2162 | mod_tree_remove(mod); |
0286b5ea | 2163 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2164 | module_bug_cleanup(mod); |
0be964be PZ |
2165 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
2166 | synchronize_sched(); | |
944a1fa0 RR |
2167 | mutex_unlock(&module_mutex); |
2168 | ||
85c898db RR |
2169 | /* This may be empty, but that's OK */ |
2170 | disable_ro_nx(&mod->init_layout); | |
d453cded | 2171 | module_arch_freeing_init(mod); |
7523e4dc | 2172 | module_memfree(mod->init_layout.base); |
1da177e4 | 2173 | kfree(mod->args); |
259354de | 2174 | percpu_modfree(mod); |
9f85a4bb | 2175 | |
35a9393c | 2176 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2177 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2178 | |
1da177e4 | 2179 | /* Finally, free the core (containing the module structure) */ |
85c898db | 2180 | disable_ro_nx(&mod->core_layout); |
7523e4dc | 2181 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2182 | } |
2183 | ||
2184 | void *__symbol_get(const char *symbol) | |
2185 | { | |
2186 | struct module *owner; | |
414fd31b | 2187 | const struct kernel_symbol *sym; |
1da177e4 | 2188 | |
24da1cbf | 2189 | preempt_disable(); |
414fd31b TA |
2190 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2191 | if (sym && strong_try_module_get(owner)) | |
2192 | sym = NULL; | |
24da1cbf | 2193 | preempt_enable(); |
1da177e4 | 2194 | |
414fd31b | 2195 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
2196 | } |
2197 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2198 | ||
eea8b54d AN |
2199 | /* |
2200 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2201 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2202 | * |
2203 | * You must hold the module_mutex. | |
eea8b54d AN |
2204 | */ |
2205 | static int verify_export_symbols(struct module *mod) | |
2206 | { | |
b211104d | 2207 | unsigned int i; |
eea8b54d | 2208 | struct module *owner; |
b211104d RR |
2209 | const struct kernel_symbol *s; |
2210 | struct { | |
2211 | const struct kernel_symbol *sym; | |
2212 | unsigned int num; | |
2213 | } arr[] = { | |
2214 | { mod->syms, mod->num_syms }, | |
2215 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2216 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2217 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2218 | { mod->unused_syms, mod->num_unused_syms }, |
2219 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2220 | #endif |
b211104d | 2221 | }; |
eea8b54d | 2222 | |
b211104d RR |
2223 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2224 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 2225 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 2226 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
2227 | " (owned by %s)\n", |
2228 | mod->name, s->name, module_name(owner)); | |
2229 | return -ENOEXEC; | |
2230 | } | |
eea8b54d | 2231 | } |
b211104d RR |
2232 | } |
2233 | return 0; | |
eea8b54d AN |
2234 | } |
2235 | ||
9a4b9708 | 2236 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2237 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2238 | { | |
2239 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2240 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2241 | unsigned long secbase; |
49668688 | 2242 | unsigned int i; |
1da177e4 | 2243 | int ret = 0; |
414fd31b | 2244 | const struct kernel_symbol *ksym; |
1da177e4 | 2245 | |
49668688 RR |
2246 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2247 | const char *name = info->strtab + sym[i].st_name; | |
2248 | ||
1da177e4 LT |
2249 | switch (sym[i].st_shndx) { |
2250 | case SHN_COMMON: | |
80375980 JM |
2251 | /* Ignore common symbols */ |
2252 | if (!strncmp(name, "__gnu_lto", 9)) | |
2253 | break; | |
2254 | ||
1da177e4 LT |
2255 | /* We compiled with -fno-common. These are not |
2256 | supposed to happen. */ | |
5e124169 | 2257 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2258 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2259 | mod->name); |
2260 | ret = -ENOEXEC; | |
2261 | break; | |
2262 | ||
2263 | case SHN_ABS: | |
2264 | /* Don't need to do anything */ | |
5e124169 | 2265 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2266 | (long)sym[i].st_value); |
2267 | break; | |
2268 | ||
1ce15ef4 JY |
2269 | case SHN_LIVEPATCH: |
2270 | /* Livepatch symbols are resolved by livepatch */ | |
2271 | break; | |
2272 | ||
1da177e4 | 2273 | case SHN_UNDEF: |
49668688 | 2274 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2275 | /* Ok if resolved. */ |
9bea7f23 | 2276 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 2277 | sym[i].st_value = ksym->value; |
1da177e4 | 2278 | break; |
414fd31b TA |
2279 | } |
2280 | ||
1da177e4 | 2281 | /* Ok if weak. */ |
9bea7f23 | 2282 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2283 | break; |
2284 | ||
bddb12b3 AM |
2285 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
2286 | mod->name, name, PTR_ERR(ksym)); | |
9bea7f23 | 2287 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
2288 | break; |
2289 | ||
2290 | default: | |
2291 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2292 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2293 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2294 | else |
49668688 | 2295 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2296 | sym[i].st_value += secbase; |
2297 | break; | |
2298 | } | |
2299 | } | |
2300 | ||
2301 | return ret; | |
2302 | } | |
2303 | ||
49668688 | 2304 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2305 | { |
2306 | unsigned int i; | |
2307 | int err = 0; | |
2308 | ||
2309 | /* Now do relocations. */ | |
49668688 RR |
2310 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2311 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2312 | |
2313 | /* Not a valid relocation section? */ | |
49668688 | 2314 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2315 | continue; |
2316 | ||
2317 | /* Don't bother with non-allocated sections */ | |
49668688 | 2318 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2319 | continue; |
2320 | ||
1ce15ef4 JY |
2321 | /* Livepatch relocation sections are applied by livepatch */ |
2322 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2323 | continue; | |
2324 | ||
49668688 RR |
2325 | if (info->sechdrs[i].sh_type == SHT_REL) |
2326 | err = apply_relocate(info->sechdrs, info->strtab, | |
2327 | info->index.sym, i, mod); | |
2328 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2329 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2330 | info->index.sym, i, mod); | |
22e268eb RR |
2331 | if (err < 0) |
2332 | break; | |
2333 | } | |
2334 | return err; | |
2335 | } | |
2336 | ||
088af9a6 HD |
2337 | /* Additional bytes needed by arch in front of individual sections */ |
2338 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2339 | unsigned int section) | |
2340 | { | |
2341 | /* default implementation just returns zero */ | |
2342 | return 0; | |
2343 | } | |
2344 | ||
1da177e4 | 2345 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2346 | static long get_offset(struct module *mod, unsigned int *size, |
2347 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2348 | { |
2349 | long ret; | |
2350 | ||
088af9a6 | 2351 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2352 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2353 | *size = ret + sechdr->sh_size; | |
2354 | return ret; | |
2355 | } | |
2356 | ||
2357 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2358 | might -- code, read-only data, read-write data, small data. Tally | |
2359 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2360 | belongs in init. */ | |
49668688 | 2361 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2362 | { |
2363 | static unsigned long const masks[][2] = { | |
2364 | /* NOTE: all executable code must be the first section | |
2365 | * in this array; otherwise modify the text_size | |
2366 | * finder in the two loops below */ | |
2367 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2368 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2369 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2370 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2371 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2372 | }; | |
2373 | unsigned int m, i; | |
2374 | ||
49668688 RR |
2375 | for (i = 0; i < info->hdr->e_shnum; i++) |
2376 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2377 | |
5e124169 | 2378 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2379 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2380 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2381 | Elf_Shdr *s = &info->sechdrs[i]; | |
2382 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2383 | |
2384 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2385 | || (s->sh_flags & masks[m][1]) | |
2386 | || s->sh_entsize != ~0UL | |
49668688 | 2387 | || strstarts(sname, ".init")) |
1da177e4 | 2388 | continue; |
7523e4dc | 2389 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2390 | pr_debug("\t%s\n", sname); |
1da177e4 | 2391 | } |
84e1c6bb MC |
2392 | switch (m) { |
2393 | case 0: /* executable */ | |
7523e4dc RR |
2394 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2395 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2396 | break; |
2397 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2398 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2399 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2400 | break; |
444d13ff JY |
2401 | case 2: /* RO after init */ |
2402 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2403 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2404 | break; | |
2405 | case 4: /* whole core */ | |
7523e4dc | 2406 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2407 | break; |
2408 | } | |
1da177e4 LT |
2409 | } |
2410 | ||
5e124169 | 2411 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2412 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2413 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2414 | Elf_Shdr *s = &info->sechdrs[i]; | |
2415 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2416 | |
2417 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2418 | || (s->sh_flags & masks[m][1]) | |
2419 | || s->sh_entsize != ~0UL | |
49668688 | 2420 | || !strstarts(sname, ".init")) |
1da177e4 | 2421 | continue; |
7523e4dc | 2422 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2423 | | INIT_OFFSET_MASK); |
5e124169 | 2424 | pr_debug("\t%s\n", sname); |
1da177e4 | 2425 | } |
84e1c6bb MC |
2426 | switch (m) { |
2427 | case 0: /* executable */ | |
7523e4dc RR |
2428 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2429 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2430 | break; |
2431 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2432 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2433 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2434 | break; |
444d13ff JY |
2435 | case 2: |
2436 | /* | |
2437 | * RO after init doesn't apply to init_layout (only | |
2438 | * core_layout), so it just takes the value of ro_size. | |
2439 | */ | |
2440 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2441 | break; | |
2442 | case 4: /* whole init */ | |
7523e4dc | 2443 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2444 | break; |
2445 | } | |
1da177e4 LT |
2446 | } |
2447 | } | |
2448 | ||
1da177e4 LT |
2449 | static void set_license(struct module *mod, const char *license) |
2450 | { | |
2451 | if (!license) | |
2452 | license = "unspecified"; | |
2453 | ||
fa3ba2e8 | 2454 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2455 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2456 | pr_warn("%s: module license '%s' taints kernel.\n", |
2457 | mod->name, license); | |
373d4d09 RR |
2458 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2459 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2460 | } |
2461 | } | |
2462 | ||
2463 | /* Parse tag=value strings from .modinfo section */ | |
2464 | static char *next_string(char *string, unsigned long *secsize) | |
2465 | { | |
2466 | /* Skip non-zero chars */ | |
2467 | while (string[0]) { | |
2468 | string++; | |
2469 | if ((*secsize)-- <= 1) | |
2470 | return NULL; | |
2471 | } | |
2472 | ||
2473 | /* Skip any zero padding. */ | |
2474 | while (!string[0]) { | |
2475 | string++; | |
2476 | if ((*secsize)-- <= 1) | |
2477 | return NULL; | |
2478 | } | |
2479 | return string; | |
2480 | } | |
2481 | ||
49668688 | 2482 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2483 | { |
2484 | char *p; | |
2485 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2486 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2487 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2488 | |
49668688 | 2489 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2490 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2491 | return p + taglen + 1; | |
2492 | } | |
2493 | return NULL; | |
2494 | } | |
2495 | ||
49668688 | 2496 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2497 | { |
2498 | struct module_attribute *attr; | |
2499 | int i; | |
2500 | ||
2501 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2502 | if (attr->setup) | |
49668688 | 2503 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2504 | } |
2505 | } | |
c988d2b2 | 2506 | |
a263f776 RR |
2507 | static void free_modinfo(struct module *mod) |
2508 | { | |
2509 | struct module_attribute *attr; | |
2510 | int i; | |
2511 | ||
2512 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2513 | if (attr->free) | |
2514 | attr->free(mod); | |
2515 | } | |
2516 | } | |
2517 | ||
1da177e4 | 2518 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2519 | |
2520 | /* lookup symbol in given range of kernel_symbols */ | |
2521 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2522 | const struct kernel_symbol *start, | |
2523 | const struct kernel_symbol *stop) | |
2524 | { | |
9d63487f AIB |
2525 | return bsearch(name, start, stop - start, |
2526 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2527 | } |
2528 | ||
ca4787b7 TA |
2529 | static int is_exported(const char *name, unsigned long value, |
2530 | const struct module *mod) | |
1da177e4 | 2531 | { |
ca4787b7 TA |
2532 | const struct kernel_symbol *ks; |
2533 | if (!mod) | |
2534 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2535 | else |
ca4787b7 TA |
2536 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2537 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2538 | } |
2539 | ||
2540 | /* As per nm */ | |
eded41c1 | 2541 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2542 | { |
eded41c1 RR |
2543 | const Elf_Shdr *sechdrs = info->sechdrs; |
2544 | ||
1da177e4 LT |
2545 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2546 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2547 | return 'v'; | |
2548 | else | |
2549 | return 'w'; | |
2550 | } | |
2551 | if (sym->st_shndx == SHN_UNDEF) | |
2552 | return 'U'; | |
e0224418 | 2553 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2554 | return 'a'; |
2555 | if (sym->st_shndx >= SHN_LORESERVE) | |
2556 | return '?'; | |
2557 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2558 | return 't'; | |
2559 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2560 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2561 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2562 | return 'r'; | |
2563 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2564 | return 'g'; | |
2565 | else | |
2566 | return 'd'; | |
2567 | } | |
2568 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2569 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2570 | return 's'; | |
2571 | else | |
2572 | return 'b'; | |
2573 | } | |
eded41c1 RR |
2574 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2575 | ".debug")) { | |
1da177e4 | 2576 | return 'n'; |
eded41c1 | 2577 | } |
1da177e4 LT |
2578 | return '?'; |
2579 | } | |
2580 | ||
4a496226 | 2581 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2582 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2583 | { |
2584 | const Elf_Shdr *sec; | |
2585 | ||
2586 | if (src->st_shndx == SHN_UNDEF | |
2587 | || src->st_shndx >= shnum | |
2588 | || !src->st_name) | |
2589 | return false; | |
2590 | ||
e0224418 MB |
2591 | #ifdef CONFIG_KALLSYMS_ALL |
2592 | if (src->st_shndx == pcpundx) | |
2593 | return true; | |
2594 | #endif | |
2595 | ||
4a496226 JB |
2596 | sec = sechdrs + src->st_shndx; |
2597 | if (!(sec->sh_flags & SHF_ALLOC) | |
2598 | #ifndef CONFIG_KALLSYMS_ALL | |
2599 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2600 | #endif | |
2601 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2602 | return false; | |
2603 | ||
2604 | return true; | |
2605 | } | |
2606 | ||
48fd1188 KC |
2607 | /* |
2608 | * We only allocate and copy the strings needed by the parts of symtab | |
2609 | * we keep. This is simple, but has the effect of making multiple | |
2610 | * copies of duplicates. We could be more sophisticated, see | |
2611 | * linux-kernel thread starting with | |
2612 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2613 | */ | |
49668688 | 2614 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2615 | { |
49668688 RR |
2616 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2617 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2618 | const Elf_Sym *src; |
54523ec7 | 2619 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2620 | |
2621 | /* Put symbol section at end of init part of module. */ | |
2622 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2623 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2624 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2625 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2626 | |
49668688 | 2627 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2628 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2629 | |
48fd1188 | 2630 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2631 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2632 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2633 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2634 | info->index.pcpu)) { | |
59ef28b1 | 2635 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2636 | ndst++; |
554bdfe5 | 2637 | } |
59ef28b1 | 2638 | } |
4a496226 JB |
2639 | |
2640 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2641 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2642 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2643 | mod->core_layout.size += strtab_size; | |
2644 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
4a496226 | 2645 | |
554bdfe5 JB |
2646 | /* Put string table section at end of init part of module. */ |
2647 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2648 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2649 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2650 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2651 | |
2652 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2653 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2654 | __alignof__(struct mod_kallsyms)); | |
2655 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2656 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
2657 | mod->init_layout.size = debug_align(mod->init_layout.size); | |
4a496226 JB |
2658 | } |
2659 | ||
8244062e RR |
2660 | /* |
2661 | * We use the full symtab and strtab which layout_symtab arranged to | |
2662 | * be appended to the init section. Later we switch to the cut-down | |
2663 | * core-only ones. | |
2664 | */ | |
811d66a0 | 2665 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2666 | { |
4a496226 JB |
2667 | unsigned int i, ndst; |
2668 | const Elf_Sym *src; | |
2669 | Elf_Sym *dst; | |
554bdfe5 | 2670 | char *s; |
eded41c1 | 2671 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2672 | |
8244062e RR |
2673 | /* Set up to point into init section. */ |
2674 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2675 | ||
2676 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2677 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2678 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2679 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1da177e4 LT |
2680 | |
2681 | /* Set types up while we still have access to sections. */ | |
8244062e RR |
2682 | for (i = 0; i < mod->kallsyms->num_symtab; i++) |
2683 | mod->kallsyms->symtab[i].st_info | |
2684 | = elf_type(&mod->kallsyms->symtab[i], info); | |
2685 | ||
2686 | /* Now populate the cut down core kallsyms for after init. */ | |
2687 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; | |
2688 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
2689 | src = mod->kallsyms->symtab; | |
2690 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1ce15ef4 | 2691 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2692 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2693 | info->index.pcpu)) { | |
59ef28b1 | 2694 | dst[ndst] = src[i]; |
8244062e RR |
2695 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2696 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2697 | KSYM_NAME_LEN) + 1; |
2698 | } | |
4a496226 | 2699 | } |
8244062e | 2700 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2701 | } |
2702 | #else | |
49668688 | 2703 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2704 | { |
2705 | } | |
3ae91c21 | 2706 | |
abbce906 | 2707 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2708 | { |
2709 | } | |
2710 | #endif /* CONFIG_KALLSYMS */ | |
2711 | ||
52796312 | 2712 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2713 | { |
811d66a0 RR |
2714 | if (!debug) |
2715 | return; | |
e9d376f0 | 2716 | #ifdef CONFIG_DYNAMIC_DEBUG |
52796312 | 2717 | if (ddebug_add_module(debug, num, mod->name)) |
bddb12b3 AM |
2718 | pr_err("dynamic debug error adding module: %s\n", |
2719 | debug->modname); | |
e9d376f0 | 2720 | #endif |
5e458cc0 | 2721 | } |
346e15be | 2722 | |
52796312 | 2723 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2724 | { |
2725 | if (debug) | |
52796312 | 2726 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2727 | } |
2728 | ||
74e08fcf JB |
2729 | void * __weak module_alloc(unsigned long size) |
2730 | { | |
82fab442 | 2731 | return vmalloc_exec(size); |
74e08fcf JB |
2732 | } |
2733 | ||
4f2294b6 | 2734 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2735 | static void kmemleak_load_module(const struct module *mod, |
2736 | const struct load_info *info) | |
4f2294b6 CM |
2737 | { |
2738 | unsigned int i; | |
2739 | ||
2740 | /* only scan the sections containing data */ | |
c017b4be | 2741 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2742 | |
49668688 | 2743 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2744 | /* Scan all writable sections that's not executable */ |
2745 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2746 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2747 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2748 | continue; |
2749 | ||
49668688 RR |
2750 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2751 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2752 | } |
2753 | } | |
2754 | #else | |
49668688 RR |
2755 | static inline void kmemleak_load_module(const struct module *mod, |
2756 | const struct load_info *info) | |
4f2294b6 CM |
2757 | { |
2758 | } | |
2759 | #endif | |
2760 | ||
106a4ee2 | 2761 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2762 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2763 | { |
2764 | int err = -ENOKEY; | |
34e1169d KC |
2765 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2766 | const void *mod = info->hdr; | |
caabe240 | 2767 | |
bca014ca BH |
2768 | /* |
2769 | * Require flags == 0, as a module with version information | |
2770 | * removed is no longer the module that was signed | |
2771 | */ | |
2772 | if (flags == 0 && | |
2773 | info->len > markerlen && | |
34e1169d | 2774 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2775 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2776 | info->len -= markerlen; |
2777 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2778 | } |
2779 | ||
2780 | if (!err) { | |
2781 | info->sig_ok = true; | |
2782 | return 0; | |
2783 | } | |
2784 | ||
2785 | /* Not having a signature is only an error if we're strict. */ | |
2c8fd268 | 2786 | if (err == -ENOKEY && !is_module_sig_enforced()) |
106a4ee2 RR |
2787 | err = 0; |
2788 | ||
2789 | return err; | |
2790 | } | |
2791 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2792 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2793 | { |
2794 | return 0; | |
2795 | } | |
2796 | #endif /* !CONFIG_MODULE_SIG */ | |
2797 | ||
34e1169d KC |
2798 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2799 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2800 | { |
34e1169d KC |
2801 | if (info->len < sizeof(*(info->hdr))) |
2802 | return -ENOEXEC; | |
2803 | ||
2804 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2805 | || info->hdr->e_type != ET_REL | |
2806 | || !elf_check_arch(info->hdr) | |
2807 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2808 | return -ENOEXEC; | |
2809 | ||
2810 | if (info->hdr->e_shoff >= info->len | |
2811 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2812 | info->len - info->hdr->e_shoff)) | |
2813 | return -ENOEXEC; | |
40dd2560 | 2814 | |
34e1169d KC |
2815 | return 0; |
2816 | } | |
2817 | ||
3afe9f84 LT |
2818 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2819 | ||
2820 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2821 | { | |
2822 | do { | |
2823 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2824 | ||
2825 | if (copy_from_user(dst, usrc, n) != 0) | |
2826 | return -EFAULT; | |
2827 | cond_resched(); | |
2828 | dst += n; | |
2829 | usrc += n; | |
2830 | len -= n; | |
2831 | } while (len); | |
2832 | return 0; | |
2833 | } | |
2834 | ||
1ce15ef4 | 2835 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2836 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2837 | { |
2992ef29 JP |
2838 | if (get_modinfo(info, "livepatch")) { |
2839 | mod->klp = true; | |
2840 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2841 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2842 | mod->name); | |
2992ef29 | 2843 | } |
1ce15ef4 JY |
2844 | |
2845 | return 0; | |
2846 | } | |
2847 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2848 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2849 | { |
2850 | if (get_modinfo(info, "livepatch")) { | |
2851 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2852 | mod->name); | |
2853 | return -ENOEXEC; | |
2854 | } | |
2855 | ||
2856 | return 0; | |
2857 | } | |
2858 | #endif /* CONFIG_LIVEPATCH */ | |
2859 | ||
caf7501a AK |
2860 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2861 | { | |
2862 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2863 | return; | |
2864 | ||
2865 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2866 | mod->name); | |
2867 | } | |
2868 | ||
34e1169d KC |
2869 | /* Sets info->hdr and info->len. */ |
2870 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2871 | struct load_info *info) | |
40dd2560 RR |
2872 | { |
2873 | int err; | |
40dd2560 | 2874 | |
34e1169d KC |
2875 | info->len = len; |
2876 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2877 | return -ENOEXEC; |
2878 | ||
a1db7420 | 2879 | err = security_kernel_read_file(NULL, READING_MODULE); |
2e72d51b KC |
2880 | if (err) |
2881 | return err; | |
2882 | ||
40dd2560 | 2883 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2884 | info->hdr = __vmalloc(info->len, |
19809c2d | 2885 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2886 | if (!info->hdr) |
40dd2560 RR |
2887 | return -ENOMEM; |
2888 | ||
3afe9f84 | 2889 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2890 | vfree(info->hdr); |
2891 | return -EFAULT; | |
40dd2560 RR |
2892 | } |
2893 | ||
34e1169d KC |
2894 | return 0; |
2895 | } | |
2896 | ||
d913188c RR |
2897 | static void free_copy(struct load_info *info) |
2898 | { | |
d913188c RR |
2899 | vfree(info->hdr); |
2900 | } | |
2901 | ||
2f3238ae | 2902 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2903 | { |
2904 | unsigned int i; | |
2905 | ||
2906 | /* This should always be true, but let's be sure. */ | |
2907 | info->sechdrs[0].sh_addr = 0; | |
2908 | ||
2909 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2910 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2911 | if (shdr->sh_type != SHT_NOBITS | |
2912 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2913 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2914 | return -ENOEXEC; |
2915 | } | |
2916 | ||
2917 | /* Mark all sections sh_addr with their address in the | |
2918 | temporary image. */ | |
2919 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2920 | ||
2921 | #ifndef CONFIG_MODULE_UNLOAD | |
2922 | /* Don't load .exit sections */ | |
2923 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2924 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2925 | #endif | |
8b5f61a7 | 2926 | } |
d6df72a0 RR |
2927 | |
2928 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2929 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2930 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2931 | else | |
2932 | info->index.vers = find_sec(info, "__versions"); | |
3e2e857f KC |
2933 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2934 | ||
49668688 | 2935 | info->index.info = find_sec(info, ".modinfo"); |
3e2e857f KC |
2936 | if (!info->index.info) |
2937 | info->name = "(missing .modinfo section)"; | |
2938 | else | |
2939 | info->name = get_modinfo(info, "name"); | |
d6df72a0 | 2940 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 2941 | |
8b5f61a7 RR |
2942 | return 0; |
2943 | } | |
2944 | ||
3264d3f9 LT |
2945 | /* |
2946 | * Set up our basic convenience variables (pointers to section headers, | |
2947 | * search for module section index etc), and do some basic section | |
2948 | * verification. | |
2949 | * | |
2950 | * Return the temporary module pointer (we'll replace it with the final | |
2951 | * one when we move the module sections around). | |
2952 | */ | |
2f3238ae | 2953 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2954 | { |
2955 | unsigned int i; | |
8b5f61a7 | 2956 | int err; |
3264d3f9 LT |
2957 | struct module *mod; |
2958 | ||
2959 | /* Set up the convenience variables */ | |
2960 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2961 | info->secstrings = (void *)info->hdr |
2962 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2963 | |
2f3238ae | 2964 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2965 | if (err) |
2966 | return ERR_PTR(err); | |
3264d3f9 | 2967 | |
8b5f61a7 RR |
2968 | /* Find internal symbols and strings. */ |
2969 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2970 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2971 | info->index.sym = i; | |
2972 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2973 | info->strtab = (char *)info->hdr |
2974 | + info->sechdrs[info->index.str].sh_offset; | |
2975 | break; | |
3264d3f9 | 2976 | } |
3264d3f9 LT |
2977 | } |
2978 | ||
49668688 | 2979 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2980 | if (!info->index.mod) { |
3e2e857f KC |
2981 | pr_warn("%s: No module found in object\n", |
2982 | info->name ?: "(missing .modinfo name field)"); | |
3264d3f9 LT |
2983 | return ERR_PTR(-ENOEXEC); |
2984 | } | |
2985 | /* This is temporary: point mod into copy of data. */ | |
2986 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2987 | ||
3e2e857f KC |
2988 | /* |
2989 | * If we didn't load the .modinfo 'name' field, fall back to | |
2990 | * on-disk struct mod 'name' field. | |
2991 | */ | |
2992 | if (!info->name) | |
2993 | info->name = mod->name; | |
2994 | ||
3264d3f9 | 2995 | if (info->index.sym == 0) { |
3e2e857f | 2996 | pr_warn("%s: module has no symbols (stripped?)\n", info->name); |
3264d3f9 LT |
2997 | return ERR_PTR(-ENOEXEC); |
2998 | } | |
2999 | ||
49668688 | 3000 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3001 | |
3264d3f9 | 3002 | /* Check module struct version now, before we try to use module. */ |
49019426 | 3003 | if (!check_modstruct_version(info, mod)) |
3264d3f9 LT |
3004 | return ERR_PTR(-ENOEXEC); |
3005 | ||
3006 | return mod; | |
3264d3f9 LT |
3007 | } |
3008 | ||
2f3238ae | 3009 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3010 | { |
49668688 | 3011 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3012 | int err; |
3013 | ||
2f3238ae RR |
3014 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3015 | modmagic = NULL; | |
3016 | ||
40dd2560 RR |
3017 | /* This is allowed: modprobe --force will invalidate it. */ |
3018 | if (!modmagic) { | |
3019 | err = try_to_force_load(mod, "bad vermagic"); | |
3020 | if (err) | |
3021 | return err; | |
49668688 | 3022 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3023 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3024 | info->name, modmagic, vermagic); |
40dd2560 RR |
3025 | return -ENOEXEC; |
3026 | } | |
3027 | ||
3205c36c LP |
3028 | if (!get_modinfo(info, "intree")) { |
3029 | if (!test_taint(TAINT_OOT_MODULE)) | |
3030 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3031 | mod->name); | |
373d4d09 | 3032 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3033 | } |
2449b8ba | 3034 | |
caf7501a AK |
3035 | check_modinfo_retpoline(mod, info); |
3036 | ||
49668688 | 3037 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3038 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3039 | pr_warn("%s: module is from the staging directory, the quality " |
3040 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3041 | } |
22e268eb | 3042 | |
2992ef29 | 3043 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3044 | if (err) |
3045 | return err; | |
3046 | ||
22e268eb | 3047 | /* Set up license info based on the info section */ |
49668688 | 3048 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3049 | |
40dd2560 RR |
3050 | return 0; |
3051 | } | |
3052 | ||
eb3057df | 3053 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3054 | { |
49668688 | 3055 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3056 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3057 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3058 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3059 | mod->crcs = section_addr(info, "__kcrctab"); |
3060 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3061 | sizeof(*mod->gpl_syms), |
3062 | &mod->num_gpl_syms); | |
49668688 RR |
3063 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3064 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3065 | "__ksymtab_gpl_future", |
3066 | sizeof(*mod->gpl_future_syms), | |
3067 | &mod->num_gpl_future_syms); | |
49668688 | 3068 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3069 | |
3070 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3071 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3072 | sizeof(*mod->unused_syms), |
3073 | &mod->num_unused_syms); | |
49668688 RR |
3074 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3075 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3076 | sizeof(*mod->unused_gpl_syms), |
3077 | &mod->num_unused_gpl_syms); | |
49668688 | 3078 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3079 | #endif |
3080 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3081 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3082 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3083 | if (!mod->ctors) |
3084 | mod->ctors = section_objs(info, ".init_array", | |
3085 | sizeof(*mod->ctors), &mod->num_ctors); | |
3086 | else if (find_sec(info, ".init_array")) { | |
3087 | /* | |
3088 | * This shouldn't happen with same compiler and binutils | |
3089 | * building all parts of the module. | |
3090 | */ | |
6da0b565 | 3091 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3092 | mod->name); |
3093 | return -EINVAL; | |
3094 | } | |
f91a13bb LT |
3095 | #endif |
3096 | ||
3097 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3098 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3099 | sizeof(*mod->tracepoints_ptrs), | |
3100 | &mod->num_tracepoints); | |
f91a13bb | 3101 | #endif |
bf5438fc JB |
3102 | #ifdef HAVE_JUMP_LABEL |
3103 | mod->jump_entries = section_objs(info, "__jump_table", | |
3104 | sizeof(*mod->jump_entries), | |
3105 | &mod->num_jump_entries); | |
3106 | #endif | |
f91a13bb | 3107 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3108 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3109 | sizeof(*mod->trace_events), |
3110 | &mod->num_trace_events); | |
99be647c JL |
3111 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3112 | sizeof(*mod->trace_evals), | |
3113 | &mod->num_trace_evals); | |
f91a13bb | 3114 | #endif |
13b9b6e7 SR |
3115 | #ifdef CONFIG_TRACING |
3116 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3117 | sizeof(*mod->trace_bprintk_fmt_start), | |
3118 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3119 | #endif |
f91a13bb LT |
3120 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3121 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3122 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3123 | sizeof(*mod->ftrace_callsites), |
3124 | &mod->num_ftrace_callsites); | |
3125 | #endif | |
540adea3 MH |
3126 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3127 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3128 | sizeof(*mod->ei_funcs), | |
3129 | &mod->num_ei_funcs); | |
92ace999 | 3130 | #endif |
811d66a0 RR |
3131 | mod->extable = section_objs(info, "__ex_table", |
3132 | sizeof(*mod->extable), &mod->num_exentries); | |
3133 | ||
49668688 | 3134 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3135 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3136 | |
3137 | info->debug = section_objs(info, "__verbose", | |
3138 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3139 | |
3140 | return 0; | |
f91a13bb LT |
3141 | } |
3142 | ||
49668688 | 3143 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3144 | { |
3145 | int i; | |
3146 | void *ptr; | |
3147 | ||
3148 | /* Do the allocs. */ | |
7523e4dc | 3149 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3150 | /* |
3151 | * The pointer to this block is stored in the module structure | |
3152 | * which is inside the block. Just mark it as not being a | |
3153 | * leak. | |
3154 | */ | |
3155 | kmemleak_not_leak(ptr); | |
3156 | if (!ptr) | |
d913188c | 3157 | return -ENOMEM; |
65b8a9b4 | 3158 | |
7523e4dc RR |
3159 | memset(ptr, 0, mod->core_layout.size); |
3160 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3161 | |
7523e4dc RR |
3162 | if (mod->init_layout.size) { |
3163 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3164 | /* |
3165 | * The pointer to this block is stored in the module structure | |
3166 | * which is inside the block. This block doesn't need to be | |
3167 | * scanned as it contains data and code that will be freed | |
3168 | * after the module is initialized. | |
3169 | */ | |
3170 | kmemleak_ignore(ptr); | |
3171 | if (!ptr) { | |
7523e4dc | 3172 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3173 | return -ENOMEM; |
3174 | } | |
7523e4dc RR |
3175 | memset(ptr, 0, mod->init_layout.size); |
3176 | mod->init_layout.base = ptr; | |
82fab442 | 3177 | } else |
7523e4dc | 3178 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3179 | |
3180 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3181 | pr_debug("final section addresses:\n"); |
49668688 | 3182 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3183 | void *dest; |
49668688 | 3184 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3185 | |
49668688 | 3186 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3187 | continue; |
3188 | ||
49668688 | 3189 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3190 | dest = mod->init_layout.base |
49668688 | 3191 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3192 | else |
7523e4dc | 3193 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3194 | |
49668688 RR |
3195 | if (shdr->sh_type != SHT_NOBITS) |
3196 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3197 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3198 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3199 | pr_debug("\t0x%lx %s\n", |
3200 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3201 | } |
d913188c RR |
3202 | |
3203 | return 0; | |
65b8a9b4 LT |
3204 | } |
3205 | ||
49668688 | 3206 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3207 | { |
3205c36c LP |
3208 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3209 | ||
22e268eb RR |
3210 | /* |
3211 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3212 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3213 | * using GPL-only symbols it needs. | |
3214 | */ | |
3215 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3216 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3217 | |
3218 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3219 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3220 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3221 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3222 | |
c99af375 MG |
3223 | /* lve claims to be GPL but upstream won't provide source */ |
3224 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3225 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3226 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3227 | |
3205c36c LP |
3228 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3229 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3230 | ||
22e268eb RR |
3231 | #ifdef CONFIG_MODVERSIONS |
3232 | if ((mod->num_syms && !mod->crcs) | |
3233 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3234 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3235 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3236 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3237 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3238 | #endif | |
3239 | ) { | |
3240 | return try_to_force_load(mod, | |
3241 | "no versions for exported symbols"); | |
3242 | } | |
3243 | #endif | |
3244 | return 0; | |
3245 | } | |
3246 | ||
3247 | static void flush_module_icache(const struct module *mod) | |
3248 | { | |
3249 | mm_segment_t old_fs; | |
3250 | ||
3251 | /* flush the icache in correct context */ | |
3252 | old_fs = get_fs(); | |
3253 | set_fs(KERNEL_DS); | |
3254 | ||
3255 | /* | |
3256 | * Flush the instruction cache, since we've played with text. | |
3257 | * Do it before processing of module parameters, so the module | |
3258 | * can provide parameter accessor functions of its own. | |
3259 | */ | |
7523e4dc RR |
3260 | if (mod->init_layout.base) |
3261 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3262 | (unsigned long)mod->init_layout.base | |
3263 | + mod->init_layout.size); | |
3264 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3265 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3266 | |
3267 | set_fs(old_fs); | |
3268 | } | |
3269 | ||
74e08fcf JB |
3270 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3271 | Elf_Shdr *sechdrs, | |
3272 | char *secstrings, | |
3273 | struct module *mod) | |
3274 | { | |
3275 | return 0; | |
3276 | } | |
3277 | ||
be7de5f9 PB |
3278 | /* module_blacklist is a comma-separated list of module names */ |
3279 | static char *module_blacklist; | |
96b5b194 | 3280 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3281 | { |
3282 | const char *p; | |
3283 | size_t len; | |
3284 | ||
3285 | if (!module_blacklist) | |
3286 | return false; | |
3287 | ||
3288 | for (p = module_blacklist; *p; p += len) { | |
3289 | len = strcspn(p, ","); | |
3290 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3291 | return true; | |
3292 | if (p[len] == ',') | |
3293 | len++; | |
3294 | } | |
3295 | return false; | |
3296 | } | |
3297 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3298 | ||
2f3238ae | 3299 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3300 | { |
d913188c | 3301 | /* Module within temporary copy. */ |
1da177e4 | 3302 | struct module *mod; |
444d13ff | 3303 | unsigned int ndx; |
d913188c | 3304 | int err; |
3ae91c21 | 3305 | |
2f3238ae | 3306 | mod = setup_load_info(info, flags); |
d913188c RR |
3307 | if (IS_ERR(mod)) |
3308 | return mod; | |
1da177e4 | 3309 | |
3e2e857f | 3310 | if (blacklisted(info->name)) |
be7de5f9 PB |
3311 | return ERR_PTR(-EPERM); |
3312 | ||
2f3238ae | 3313 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
3314 | if (err) |
3315 | return ERR_PTR(err); | |
1da177e4 | 3316 | |
1da177e4 | 3317 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
3318 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
3319 | info->secstrings, mod); | |
1da177e4 | 3320 | if (err < 0) |
8d8022e8 | 3321 | return ERR_PTR(err); |
1da177e4 | 3322 | |
8d8022e8 RR |
3323 | /* We will do a special allocation for per-cpu sections later. */ |
3324 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3325 | |
444d13ff JY |
3326 | /* |
3327 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3328 | * layout_sections() can put it in the right place. | |
3329 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3330 | */ | |
3331 | ndx = find_sec(info, ".data..ro_after_init"); | |
3332 | if (ndx) | |
3333 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3334 | ||
1da177e4 LT |
3335 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3336 | this is done generically; there doesn't appear to be any | |
3337 | special cases for the architectures. */ | |
49668688 | 3338 | layout_sections(mod, info); |
49668688 | 3339 | layout_symtab(mod, info); |
1da177e4 | 3340 | |
65b8a9b4 | 3341 | /* Allocate and move to the final place */ |
49668688 | 3342 | err = move_module(mod, info); |
d913188c | 3343 | if (err) |
8d8022e8 | 3344 | return ERR_PTR(err); |
d913188c RR |
3345 | |
3346 | /* Module has been copied to its final place now: return it. */ | |
3347 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3348 | kmemleak_load_module(mod, info); |
d913188c | 3349 | return mod; |
d913188c RR |
3350 | } |
3351 | ||
3352 | /* mod is no longer valid after this! */ | |
3353 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3354 | { | |
d913188c | 3355 | percpu_modfree(mod); |
d453cded | 3356 | module_arch_freeing_init(mod); |
7523e4dc RR |
3357 | module_memfree(mod->init_layout.base); |
3358 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3359 | } |
3360 | ||
74e08fcf JB |
3361 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3362 | const Elf_Shdr *sechdrs, | |
3363 | struct module *me) | |
3364 | { | |
3365 | return 0; | |
3366 | } | |
3367 | ||
811d66a0 RR |
3368 | static int post_relocation(struct module *mod, const struct load_info *info) |
3369 | { | |
51f3d0f4 | 3370 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3371 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3372 | ||
3373 | /* Copy relocated percpu area over. */ | |
3374 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3375 | info->sechdrs[info->index.pcpu].sh_size); | |
3376 | ||
51f3d0f4 | 3377 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3378 | add_kallsyms(mod, info); |
3379 | ||
3380 | /* Arch-specific module finalizing. */ | |
3381 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3382 | } | |
3383 | ||
9bb9c3be RR |
3384 | /* Is this module of this name done loading? No locks held. */ |
3385 | static bool finished_loading(const char *name) | |
3386 | { | |
3387 | struct module *mod; | |
3388 | bool ret; | |
3389 | ||
9cc019b8 PZ |
3390 | /* |
3391 | * The module_mutex should not be a heavily contended lock; | |
3392 | * if we get the occasional sleep here, we'll go an extra iteration | |
3393 | * in the wait_event_interruptible(), which is harmless. | |
3394 | */ | |
3395 | sched_annotate_sleep(); | |
9bb9c3be | 3396 | mutex_lock(&module_mutex); |
4f6de4d5 | 3397 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3398 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3399 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3400 | mutex_unlock(&module_mutex); |
3401 | ||
3402 | return ret; | |
3403 | } | |
3404 | ||
34e1169d KC |
3405 | /* Call module constructors. */ |
3406 | static void do_mod_ctors(struct module *mod) | |
3407 | { | |
3408 | #ifdef CONFIG_CONSTRUCTORS | |
3409 | unsigned long i; | |
3410 | ||
3411 | for (i = 0; i < mod->num_ctors; i++) | |
3412 | mod->ctors[i](); | |
3413 | #endif | |
3414 | } | |
3415 | ||
c7496379 RR |
3416 | /* For freeing module_init on success, in case kallsyms traversing */ |
3417 | struct mod_initfree { | |
3418 | struct rcu_head rcu; | |
3419 | void *module_init; | |
3420 | }; | |
3421 | ||
3422 | static void do_free_init(struct rcu_head *head) | |
3423 | { | |
3424 | struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); | |
3425 | module_memfree(m->module_init); | |
3426 | kfree(m); | |
3427 | } | |
3428 | ||
be02a186 JK |
3429 | /* |
3430 | * This is where the real work happens. | |
3431 | * | |
3432 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3433 | * helper command 'lx-symbols'. | |
3434 | */ | |
3435 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3436 | { |
3437 | int ret = 0; | |
c7496379 RR |
3438 | struct mod_initfree *freeinit; |
3439 | ||
3440 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3441 | if (!freeinit) { | |
3442 | ret = -ENOMEM; | |
3443 | goto fail; | |
3444 | } | |
7523e4dc | 3445 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3446 | |
774a1221 TH |
3447 | /* |
3448 | * We want to find out whether @mod uses async during init. Clear | |
3449 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3450 | */ | |
3451 | current->flags &= ~PF_USED_ASYNC; | |
3452 | ||
34e1169d KC |
3453 | do_mod_ctors(mod); |
3454 | /* Start the module */ | |
3455 | if (mod->init != NULL) | |
3456 | ret = do_one_initcall(mod->init); | |
3457 | if (ret < 0) { | |
c7496379 | 3458 | goto fail_free_freeinit; |
34e1169d KC |
3459 | } |
3460 | if (ret > 0) { | |
bddb12b3 AM |
3461 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3462 | "follow 0/-E convention\n" | |
3463 | "%s: loading module anyway...\n", | |
3464 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3465 | dump_stack(); |
3466 | } | |
3467 | ||
3468 | /* Now it's a first class citizen! */ | |
3469 | mod->state = MODULE_STATE_LIVE; | |
3470 | blocking_notifier_call_chain(&module_notify_list, | |
3471 | MODULE_STATE_LIVE, mod); | |
3472 | ||
774a1221 TH |
3473 | /* |
3474 | * We need to finish all async code before the module init sequence | |
3475 | * is done. This has potential to deadlock. For example, a newly | |
3476 | * detected block device can trigger request_module() of the | |
3477 | * default iosched from async probing task. Once userland helper | |
3478 | * reaches here, async_synchronize_full() will wait on the async | |
3479 | * task waiting on request_module() and deadlock. | |
3480 | * | |
3481 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3482 | * iff module init queued any async jobs. This isn't a full | |
3483 | * solution as it will deadlock the same if module loading from | |
3484 | * async jobs nests more than once; however, due to the various | |
3485 | * constraints, this hack seems to be the best option for now. | |
3486 | * Please refer to the following thread for details. | |
3487 | * | |
3488 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3489 | */ | |
f2411da7 | 3490 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3491 | async_synchronize_full(); |
34e1169d | 3492 | |
aba4b5c2 | 3493 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3494 | mod->init_layout.size); |
34e1169d KC |
3495 | mutex_lock(&module_mutex); |
3496 | /* Drop initial reference. */ | |
3497 | module_put(mod); | |
3498 | trim_init_extable(mod); | |
3499 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3500 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3501 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3502 | #endif |
444d13ff | 3503 | module_enable_ro(mod, true); |
93c2e105 | 3504 | mod_tree_remove_init(mod); |
85c898db | 3505 | disable_ro_nx(&mod->init_layout); |
d453cded | 3506 | module_arch_freeing_init(mod); |
7523e4dc RR |
3507 | mod->init_layout.base = NULL; |
3508 | mod->init_layout.size = 0; | |
3509 | mod->init_layout.ro_size = 0; | |
444d13ff | 3510 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3511 | mod->init_layout.text_size = 0; |
c7496379 RR |
3512 | /* |
3513 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be PZ |
3514 | * walking this with preempt disabled. In all the failure paths, we |
3515 | * call synchronize_sched(), but we don't want to slow down the success | |
3516 | * path, so use actual RCU here. | |
ae646f0b JH |
3517 | * Note that module_alloc() on most architectures creates W+X page |
3518 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3519 | * code such as mark_rodata_ro() which depends on those mappings to | |
3520 | * be cleaned up needs to sync with the queued work - ie | |
3521 | * rcu_barrier_sched() | |
c7496379 | 3522 | */ |
0be964be | 3523 | call_rcu_sched(&freeinit->rcu, do_free_init); |
34e1169d KC |
3524 | mutex_unlock(&module_mutex); |
3525 | wake_up_all(&module_wq); | |
3526 | ||
3527 | return 0; | |
c7496379 RR |
3528 | |
3529 | fail_free_freeinit: | |
3530 | kfree(freeinit); | |
3531 | fail: | |
3532 | /* Try to protect us from buggy refcounters. */ | |
3533 | mod->state = MODULE_STATE_GOING; | |
3534 | synchronize_sched(); | |
3535 | module_put(mod); | |
3536 | blocking_notifier_call_chain(&module_notify_list, | |
3537 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3538 | klp_module_going(mod); |
7dcd182b | 3539 | ftrace_release_mod(mod); |
c7496379 RR |
3540 | free_module(mod); |
3541 | wake_up_all(&module_wq); | |
3542 | return ret; | |
34e1169d KC |
3543 | } |
3544 | ||
3545 | static int may_init_module(void) | |
3546 | { | |
3547 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3548 | return -EPERM; | |
3549 | ||
3550 | return 0; | |
3551 | } | |
3552 | ||
a3535c7e RR |
3553 | /* |
3554 | * We try to place it in the list now to make sure it's unique before | |
3555 | * we dedicate too many resources. In particular, temporary percpu | |
3556 | * memory exhaustion. | |
3557 | */ | |
3558 | static int add_unformed_module(struct module *mod) | |
3559 | { | |
3560 | int err; | |
3561 | struct module *old; | |
3562 | ||
3563 | mod->state = MODULE_STATE_UNFORMED; | |
3564 | ||
3565 | again: | |
3566 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3567 | old = find_module_all(mod->name, strlen(mod->name), true); |
3568 | if (old != NULL) { | |
a3535c7e RR |
3569 | if (old->state == MODULE_STATE_COMING |
3570 | || old->state == MODULE_STATE_UNFORMED) { | |
3571 | /* Wait in case it fails to load. */ | |
3572 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3573 | err = wait_event_interruptible(module_wq, |
3574 | finished_loading(mod->name)); | |
a3535c7e RR |
3575 | if (err) |
3576 | goto out_unlocked; | |
3577 | goto again; | |
3578 | } | |
3579 | err = -EEXIST; | |
3580 | goto out; | |
3581 | } | |
4f666546 | 3582 | mod_update_bounds(mod); |
a3535c7e | 3583 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3584 | mod_tree_insert(mod); |
a3535c7e RR |
3585 | err = 0; |
3586 | ||
3587 | out: | |
3588 | mutex_unlock(&module_mutex); | |
3589 | out_unlocked: | |
3590 | return err; | |
3591 | } | |
3592 | ||
3593 | static int complete_formation(struct module *mod, struct load_info *info) | |
3594 | { | |
3595 | int err; | |
3596 | ||
3597 | mutex_lock(&module_mutex); | |
3598 | ||
3599 | /* Find duplicate symbols (must be called under lock). */ | |
3600 | err = verify_export_symbols(mod); | |
3601 | if (err < 0) | |
3602 | goto out; | |
3603 | ||
3604 | /* This relies on module_mutex for list integrity. */ | |
3605 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3606 | ||
444d13ff | 3607 | module_enable_ro(mod, false); |
85c898db | 3608 | module_enable_nx(mod); |
4982223e | 3609 | |
a3535c7e RR |
3610 | /* Mark state as coming so strong_try_module_get() ignores us, |
3611 | * but kallsyms etc. can see us. */ | |
3612 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3613 | mutex_unlock(&module_mutex); |
3614 | ||
4982223e | 3615 | return 0; |
a3535c7e RR |
3616 | |
3617 | out: | |
3618 | mutex_unlock(&module_mutex); | |
3619 | return err; | |
3620 | } | |
3621 | ||
4c973d16 JY |
3622 | static int prepare_coming_module(struct module *mod) |
3623 | { | |
7e545d6e JY |
3624 | int err; |
3625 | ||
4c973d16 | 3626 | ftrace_module_enable(mod); |
7e545d6e JY |
3627 | err = klp_module_coming(mod); |
3628 | if (err) | |
3629 | return err; | |
3630 | ||
4c973d16 JY |
3631 | blocking_notifier_call_chain(&module_notify_list, |
3632 | MODULE_STATE_COMING, mod); | |
3633 | return 0; | |
3634 | } | |
3635 | ||
ecc86170 LR |
3636 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3637 | void *arg) | |
54041d8a | 3638 | { |
f2411da7 LR |
3639 | struct module *mod = arg; |
3640 | int ret; | |
3641 | ||
3642 | if (strcmp(param, "async_probe") == 0) { | |
3643 | mod->async_probe_requested = true; | |
3644 | return 0; | |
3645 | } | |
3646 | ||
6da0b565 | 3647 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3648 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3649 | if (ret != 0) |
3650 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3651 | return 0; |
3652 | } | |
3653 | ||
d913188c RR |
3654 | /* Allocate and load the module: note that size of section 0 is always |
3655 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3656 | static int load_module(struct load_info *info, const char __user *uargs, |
3657 | int flags) | |
d913188c | 3658 | { |
a3535c7e | 3659 | struct module *mod; |
d913188c | 3660 | long err; |
51e158c1 | 3661 | char *after_dashes; |
d913188c | 3662 | |
bca014ca | 3663 | err = module_sig_check(info, flags); |
34e1169d KC |
3664 | if (err) |
3665 | goto free_copy; | |
d913188c | 3666 | |
34e1169d | 3667 | err = elf_header_check(info); |
d913188c | 3668 | if (err) |
34e1169d | 3669 | goto free_copy; |
d913188c RR |
3670 | |
3671 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3672 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3673 | if (IS_ERR(mod)) { |
3674 | err = PTR_ERR(mod); | |
d913188c | 3675 | goto free_copy; |
1da177e4 | 3676 | } |
1da177e4 | 3677 | |
ca86cad7 RGB |
3678 | audit_log_kern_module(mod->name); |
3679 | ||
a3535c7e RR |
3680 | /* Reserve our place in the list. */ |
3681 | err = add_unformed_module(mod); | |
3682 | if (err) | |
1fb9341a | 3683 | goto free_module; |
1fb9341a | 3684 | |
106a4ee2 | 3685 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3686 | mod->sig_ok = info->sig_ok; |
64748a2c | 3687 | if (!mod->sig_ok) { |
bddb12b3 | 3688 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3689 | "and/or required key missing - tainting " |
bddb12b3 | 3690 | "kernel\n", mod->name); |
66cc69e3 | 3691 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3692 | } |
106a4ee2 RR |
3693 | #endif |
3694 | ||
8d8022e8 | 3695 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3696 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3697 | if (err) |
3698 | goto unlink_mod; | |
3699 | ||
49668688 | 3700 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3701 | err = module_unload_init(mod); |
3702 | if (err) | |
1fb9341a | 3703 | goto unlink_mod; |
1da177e4 | 3704 | |
cf2fde7b | 3705 | init_param_lock(mod); |
b51d23e4 | 3706 | |
22e268eb RR |
3707 | /* Now we've got everything in the final locations, we can |
3708 | * find optional sections. */ | |
eb3057df FH |
3709 | err = find_module_sections(mod, info); |
3710 | if (err) | |
3711 | goto free_unload; | |
9b37ccfc | 3712 | |
49668688 | 3713 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3714 | if (err) |
3715 | goto free_unload; | |
9841d61d | 3716 | |
c988d2b2 | 3717 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3718 | setup_modinfo(mod, info); |
c988d2b2 | 3719 | |
1da177e4 | 3720 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3721 | err = simplify_symbols(mod, info); |
1da177e4 | 3722 | if (err < 0) |
d913188c | 3723 | goto free_modinfo; |
1da177e4 | 3724 | |
34e1169d | 3725 | err = apply_relocations(mod, info); |
22e268eb | 3726 | if (err < 0) |
d913188c | 3727 | goto free_modinfo; |
1da177e4 | 3728 | |
34e1169d | 3729 | err = post_relocation(mod, info); |
1da177e4 | 3730 | if (err < 0) |
d913188c | 3731 | goto free_modinfo; |
1da177e4 | 3732 | |
22e268eb | 3733 | flush_module_icache(mod); |
378bac82 | 3734 | |
6526c534 RR |
3735 | /* Now copy in args */ |
3736 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3737 | if (IS_ERR(mod->args)) { | |
3738 | err = PTR_ERR(mod->args); | |
3739 | goto free_arch_cleanup; | |
3740 | } | |
8d3b33f6 | 3741 | |
52796312 | 3742 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3743 | |
a949ae56 SRRH |
3744 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3745 | ftrace_module_init(mod); | |
3746 | ||
a3535c7e RR |
3747 | /* Finally it's fully formed, ready to start executing. */ |
3748 | err = complete_formation(mod, info); | |
3749 | if (err) | |
1fb9341a | 3750 | goto ddebug_cleanup; |
be593f4c | 3751 | |
4c973d16 JY |
3752 | err = prepare_coming_module(mod); |
3753 | if (err) | |
3754 | goto bug_cleanup; | |
3755 | ||
51f3d0f4 | 3756 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3757 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3758 | -32768, 32767, mod, |
ecc86170 | 3759 | unknown_module_param_cb); |
51e158c1 RR |
3760 | if (IS_ERR(after_dashes)) { |
3761 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3762 | goto coming_cleanup; |
51e158c1 RR |
3763 | } else if (after_dashes) { |
3764 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3765 | mod->name, after_dashes); | |
3766 | } | |
1da177e4 | 3767 | |
ca86cad7 | 3768 | /* Link in to sysfs. */ |
34e1169d | 3769 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3770 | if (err < 0) |
4c973d16 | 3771 | goto coming_cleanup; |
80a3d1bb | 3772 | |
1ce15ef4 JY |
3773 | if (is_livepatch_module(mod)) { |
3774 | err = copy_module_elf(mod, info); | |
3775 | if (err < 0) | |
3776 | goto sysfs_cleanup; | |
3777 | } | |
3778 | ||
48fd1188 | 3779 | /* Get rid of temporary copy. */ |
34e1169d | 3780 | free_copy(info); |
1da177e4 LT |
3781 | |
3782 | /* Done! */ | |
51f3d0f4 | 3783 | trace_module_load(mod); |
34e1169d KC |
3784 | |
3785 | return do_init_module(mod); | |
1da177e4 | 3786 | |
1ce15ef4 JY |
3787 | sysfs_cleanup: |
3788 | mod_sysfs_teardown(mod); | |
4c973d16 | 3789 | coming_cleanup: |
885a78d4 | 3790 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3791 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3792 | blocking_notifier_call_chain(&module_notify_list, |
3793 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3794 | klp_module_going(mod); |
1fb9341a RR |
3795 | bug_cleanup: |
3796 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3797 | mutex_lock(&module_mutex); |
5336377d | 3798 | module_bug_cleanup(mod); |
ee61abb3 | 3799 | mutex_unlock(&module_mutex); |
ff7e0055 AL |
3800 | |
3801 | /* we can't deallocate the module until we clear memory protection */ | |
85c898db RR |
3802 | module_disable_ro(mod); |
3803 | module_disable_nx(mod); | |
ff7e0055 | 3804 | |
a3535c7e | 3805 | ddebug_cleanup: |
1323eac7 | 3806 | ftrace_release_mod(mod); |
52796312 | 3807 | dynamic_debug_remove(mod, info->debug); |
e91defa2 | 3808 | synchronize_sched(); |
6526c534 RR |
3809 | kfree(mod->args); |
3810 | free_arch_cleanup: | |
1da177e4 | 3811 | module_arch_cleanup(mod); |
d913188c | 3812 | free_modinfo: |
a263f776 | 3813 | free_modinfo(mod); |
22e268eb | 3814 | free_unload: |
1da177e4 | 3815 | module_unload_free(mod); |
1fb9341a RR |
3816 | unlink_mod: |
3817 | mutex_lock(&module_mutex); | |
3818 | /* Unlink carefully: kallsyms could be walking list. */ | |
3819 | list_del_rcu(&mod->list); | |
758556bd | 3820 | mod_tree_remove(mod); |
1fb9341a | 3821 | wake_up_all(&module_wq); |
0be964be PZ |
3822 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
3823 | synchronize_sched(); | |
1fb9341a | 3824 | mutex_unlock(&module_mutex); |
d913188c | 3825 | free_module: |
35a9393c | 3826 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3827 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3828 | |
34e1169d | 3829 | module_deallocate(mod, info); |
d913188c | 3830 | free_copy: |
34e1169d KC |
3831 | free_copy(info); |
3832 | return err; | |
b99b87f7 PO |
3833 | } |
3834 | ||
17da2bd9 HC |
3835 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3836 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3837 | { |
34e1169d KC |
3838 | int err; |
3839 | struct load_info info = { }; | |
1da177e4 | 3840 | |
34e1169d KC |
3841 | err = may_init_module(); |
3842 | if (err) | |
3843 | return err; | |
1da177e4 | 3844 | |
34e1169d KC |
3845 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3846 | umod, len, uargs); | |
1da177e4 | 3847 | |
34e1169d KC |
3848 | err = copy_module_from_user(umod, len, &info); |
3849 | if (err) | |
3850 | return err; | |
1da177e4 | 3851 | |
2f3238ae | 3852 | return load_module(&info, uargs, 0); |
34e1169d | 3853 | } |
94462ad3 | 3854 | |
2f3238ae | 3855 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3856 | { |
34e1169d | 3857 | struct load_info info = { }; |
a1db7420 MZ |
3858 | loff_t size; |
3859 | void *hdr; | |
3860 | int err; | |
94462ad3 | 3861 | |
34e1169d KC |
3862 | err = may_init_module(); |
3863 | if (err) | |
3864 | return err; | |
1da177e4 | 3865 | |
2f3238ae | 3866 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3867 | |
2f3238ae RR |
3868 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3869 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3870 | return -EINVAL; | |
d6de2c80 | 3871 | |
a1db7420 MZ |
3872 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
3873 | READING_MODULE); | |
34e1169d KC |
3874 | if (err) |
3875 | return err; | |
a1db7420 MZ |
3876 | info.hdr = hdr; |
3877 | info.len = size; | |
1da177e4 | 3878 | |
2f3238ae | 3879 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3880 | } |
3881 | ||
3882 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3883 | { | |
3884 | return ((void *)addr >= start && (void *)addr < start + size); | |
3885 | } | |
3886 | ||
3887 | #ifdef CONFIG_KALLSYMS | |
3888 | /* | |
3889 | * This ignores the intensely annoying "mapping symbols" found | |
3890 | * in ARM ELF files: $a, $t and $d. | |
3891 | */ | |
3892 | static inline int is_arm_mapping_symbol(const char *str) | |
3893 | { | |
2e3a10a1 RK |
3894 | if (str[0] == '.' && str[1] == 'L') |
3895 | return true; | |
6c34f1f5 | 3896 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3897 | && (str[2] == '\0' || str[2] == '.'); |
3898 | } | |
3899 | ||
8244062e | 3900 | static const char *symname(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 3901 | { |
8244062e | 3902 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
3903 | } |
3904 | ||
1da177e4 LT |
3905 | static const char *get_ksymbol(struct module *mod, |
3906 | unsigned long addr, | |
3907 | unsigned long *size, | |
3908 | unsigned long *offset) | |
3909 | { | |
3910 | unsigned int i, best = 0; | |
3911 | unsigned long nextval; | |
8244062e | 3912 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
3913 | |
3914 | /* At worse, next value is at end of module */ | |
a06f6211 | 3915 | if (within_module_init(addr, mod)) |
7523e4dc | 3916 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 3917 | else |
7523e4dc | 3918 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 3919 | |
25985edc | 3920 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3921 | starts real symbols at 1). */ |
8244062e RR |
3922 | for (i = 1; i < kallsyms->num_symtab; i++) { |
3923 | if (kallsyms->symtab[i].st_shndx == SHN_UNDEF) | |
1da177e4 LT |
3924 | continue; |
3925 | ||
3926 | /* We ignore unnamed symbols: they're uninformative | |
3927 | * and inserted at a whim. */ | |
8244062e RR |
3928 | if (*symname(kallsyms, i) == '\0' |
3929 | || is_arm_mapping_symbol(symname(kallsyms, i))) | |
2e7bac53 RR |
3930 | continue; |
3931 | ||
8244062e RR |
3932 | if (kallsyms->symtab[i].st_value <= addr |
3933 | && kallsyms->symtab[i].st_value > kallsyms->symtab[best].st_value) | |
1da177e4 | 3934 | best = i; |
8244062e RR |
3935 | if (kallsyms->symtab[i].st_value > addr |
3936 | && kallsyms->symtab[i].st_value < nextval) | |
3937 | nextval = kallsyms->symtab[i].st_value; | |
1da177e4 LT |
3938 | } |
3939 | ||
3940 | if (!best) | |
3941 | return NULL; | |
3942 | ||
ffb45122 | 3943 | if (size) |
8244062e | 3944 | *size = nextval - kallsyms->symtab[best].st_value; |
ffb45122 | 3945 | if (offset) |
8244062e RR |
3946 | *offset = addr - kallsyms->symtab[best].st_value; |
3947 | return symname(kallsyms, best); | |
1da177e4 LT |
3948 | } |
3949 | ||
b865ea64 SS |
3950 | void * __weak dereference_module_function_descriptor(struct module *mod, |
3951 | void *ptr) | |
3952 | { | |
3953 | return ptr; | |
3954 | } | |
3955 | ||
6dd06c9f RR |
3956 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3957 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3958 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3959 | unsigned long *size, |
3960 | unsigned long *offset, | |
3961 | char **modname, | |
3962 | char *namebuf) | |
1da177e4 | 3963 | { |
cb2a5205 | 3964 | const char *ret = NULL; |
b7df4d1b | 3965 | struct module *mod; |
1da177e4 | 3966 | |
cb2a5205 | 3967 | preempt_disable(); |
b7df4d1b PZ |
3968 | mod = __module_address(addr); |
3969 | if (mod) { | |
3970 | if (modname) | |
3971 | *modname = mod->name; | |
3972 | ret = get_ksymbol(mod, addr, size, offset); | |
1da177e4 | 3973 | } |
6dd06c9f RR |
3974 | /* Make a copy in here where it's safe */ |
3975 | if (ret) { | |
3976 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3977 | ret = namebuf; | |
3978 | } | |
cb2a5205 | 3979 | preempt_enable(); |
b7df4d1b | 3980 | |
92dfc9dc | 3981 | return ret; |
1da177e4 LT |
3982 | } |
3983 | ||
9d65cb4a AD |
3984 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3985 | { | |
3986 | struct module *mod; | |
3987 | ||
cb2a5205 | 3988 | preempt_disable(); |
d72b3751 | 3989 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3990 | if (mod->state == MODULE_STATE_UNFORMED) |
3991 | continue; | |
9b20a352 | 3992 | if (within_module(addr, mod)) { |
9d65cb4a AD |
3993 | const char *sym; |
3994 | ||
3995 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3996 | if (!sym) | |
3997 | goto out; | |
9281acea | 3998 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3999 | preempt_enable(); |
9d65cb4a AD |
4000 | return 0; |
4001 | } | |
4002 | } | |
4003 | out: | |
cb2a5205 | 4004 | preempt_enable(); |
9d65cb4a AD |
4005 | return -ERANGE; |
4006 | } | |
4007 | ||
a5c43dae AD |
4008 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4009 | unsigned long *offset, char *modname, char *name) | |
4010 | { | |
4011 | struct module *mod; | |
4012 | ||
cb2a5205 | 4013 | preempt_disable(); |
d72b3751 | 4014 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4015 | if (mod->state == MODULE_STATE_UNFORMED) |
4016 | continue; | |
9b20a352 | 4017 | if (within_module(addr, mod)) { |
a5c43dae AD |
4018 | const char *sym; |
4019 | ||
4020 | sym = get_ksymbol(mod, addr, size, offset); | |
4021 | if (!sym) | |
4022 | goto out; | |
4023 | if (modname) | |
9281acea | 4024 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4025 | if (name) |
9281acea | 4026 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4027 | preempt_enable(); |
a5c43dae AD |
4028 | return 0; |
4029 | } | |
4030 | } | |
4031 | out: | |
cb2a5205 | 4032 | preempt_enable(); |
a5c43dae AD |
4033 | return -ERANGE; |
4034 | } | |
4035 | ||
ea07890a AD |
4036 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4037 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4038 | { |
4039 | struct module *mod; | |
4040 | ||
cb2a5205 | 4041 | preempt_disable(); |
d72b3751 | 4042 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4043 | struct mod_kallsyms *kallsyms; |
4044 | ||
0d21b0e3 RR |
4045 | if (mod->state == MODULE_STATE_UNFORMED) |
4046 | continue; | |
8244062e RR |
4047 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4048 | if (symnum < kallsyms->num_symtab) { | |
4049 | *value = kallsyms->symtab[symnum].st_value; | |
4050 | *type = kallsyms->symtab[symnum].st_info; | |
4051 | strlcpy(name, symname(kallsyms, symnum), KSYM_NAME_LEN); | |
9281acea | 4052 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4053 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4054 | preempt_enable(); |
ea07890a | 4055 | return 0; |
1da177e4 | 4056 | } |
8244062e | 4057 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4058 | } |
cb2a5205 | 4059 | preempt_enable(); |
ea07890a | 4060 | return -ERANGE; |
1da177e4 LT |
4061 | } |
4062 | ||
4063 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
4064 | { | |
4065 | unsigned int i; | |
8244062e | 4066 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4067 | |
8244062e RR |
4068 | for (i = 0; i < kallsyms->num_symtab; i++) |
4069 | if (strcmp(name, symname(kallsyms, i)) == 0 && | |
9f2d1e68 | 4070 | kallsyms->symtab[i].st_shndx != SHN_UNDEF) |
8244062e | 4071 | return kallsyms->symtab[i].st_value; |
1da177e4 LT |
4072 | return 0; |
4073 | } | |
4074 | ||
4075 | /* Look for this name: can be of form module:name. */ | |
4076 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4077 | { | |
4078 | struct module *mod; | |
4079 | char *colon; | |
4080 | unsigned long ret = 0; | |
4081 | ||
4082 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4083 | preempt_disable(); |
17586188 | 4084 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4085 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 4086 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 4087 | } else { |
0d21b0e3 RR |
4088 | list_for_each_entry_rcu(mod, &modules, list) { |
4089 | if (mod->state == MODULE_STATE_UNFORMED) | |
4090 | continue; | |
1da177e4 LT |
4091 | if ((ret = mod_find_symname(mod, name)) != 0) |
4092 | break; | |
0d21b0e3 | 4093 | } |
1da177e4 | 4094 | } |
cb2a5205 | 4095 | preempt_enable(); |
1da177e4 LT |
4096 | return ret; |
4097 | } | |
75a66614 AK |
4098 | |
4099 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4100 | struct module *, unsigned long), | |
4101 | void *data) | |
4102 | { | |
4103 | struct module *mod; | |
4104 | unsigned int i; | |
4105 | int ret; | |
4106 | ||
0be964be PZ |
4107 | module_assert_mutex(); |
4108 | ||
75a66614 | 4109 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4110 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4111 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4112 | ||
0d21b0e3 RR |
4113 | if (mod->state == MODULE_STATE_UNFORMED) |
4114 | continue; | |
8244062e | 4115 | for (i = 0; i < kallsyms->num_symtab; i++) { |
9f2d1e68 JY |
4116 | |
4117 | if (kallsyms->symtab[i].st_shndx == SHN_UNDEF) | |
4118 | continue; | |
4119 | ||
8244062e RR |
4120 | ret = fn(data, symname(kallsyms, i), |
4121 | mod, kallsyms->symtab[i].st_value); | |
75a66614 AK |
4122 | if (ret != 0) |
4123 | return ret; | |
4124 | } | |
4125 | } | |
4126 | return 0; | |
4127 | } | |
1da177e4 LT |
4128 | #endif /* CONFIG_KALLSYMS */ |
4129 | ||
7fd8329b PM |
4130 | /* Maximum number of characters written by module_flags() */ |
4131 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4132 | ||
4133 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4134 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4135 | { |
4136 | int bx = 0; | |
4137 | ||
0d21b0e3 | 4138 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4139 | if (mod->taints || |
4140 | mod->state == MODULE_STATE_GOING || | |
4141 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4142 | buf[bx++] = '('; |
cca3e707 | 4143 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4144 | /* Show a - for module-is-being-unloaded */ |
4145 | if (mod->state == MODULE_STATE_GOING) | |
4146 | buf[bx++] = '-'; | |
4147 | /* Show a + for module-is-being-loaded */ | |
4148 | if (mod->state == MODULE_STATE_COMING) | |
4149 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4150 | buf[bx++] = ')'; |
4151 | } | |
4152 | buf[bx] = '\0'; | |
4153 | ||
4154 | return buf; | |
4155 | } | |
4156 | ||
3b5d5c6b AD |
4157 | #ifdef CONFIG_PROC_FS |
4158 | /* Called by the /proc file system to return a list of modules. */ | |
4159 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4160 | { | |
4161 | mutex_lock(&module_mutex); | |
4162 | return seq_list_start(&modules, *pos); | |
4163 | } | |
4164 | ||
4165 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4166 | { | |
4167 | return seq_list_next(p, &modules, pos); | |
4168 | } | |
4169 | ||
4170 | static void m_stop(struct seq_file *m, void *p) | |
4171 | { | |
4172 | mutex_unlock(&module_mutex); | |
4173 | } | |
4174 | ||
1da177e4 LT |
4175 | static int m_show(struct seq_file *m, void *p) |
4176 | { | |
4177 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4178 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4179 | void *value; |
fa3ba2e8 | 4180 | |
0d21b0e3 RR |
4181 | /* We always ignore unformed modules. */ |
4182 | if (mod->state == MODULE_STATE_UNFORMED) | |
4183 | return 0; | |
4184 | ||
2f0f2a33 | 4185 | seq_printf(m, "%s %u", |
7523e4dc | 4186 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4187 | print_unload_info(m, mod); |
4188 | ||
4189 | /* Informative for users. */ | |
4190 | seq_printf(m, " %s", | |
6da0b565 IA |
4191 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4192 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4193 | "Live"); |
4194 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4195 | value = m->private ? NULL : mod->core_layout.base; |
4196 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4197 | |
fa3ba2e8 FM |
4198 | /* Taints info */ |
4199 | if (mod->taints) | |
21aa9280 | 4200 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4201 | |
6da0b565 | 4202 | seq_puts(m, "\n"); |
1da177e4 LT |
4203 | return 0; |
4204 | } | |
4205 | ||
4206 | /* Format: modulename size refcount deps address | |
4207 | ||
4208 | Where refcount is a number or -, and deps is a comma-separated list | |
4209 | of depends or -. | |
4210 | */ | |
3b5d5c6b | 4211 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4212 | .start = m_start, |
4213 | .next = m_next, | |
4214 | .stop = m_stop, | |
4215 | .show = m_show | |
4216 | }; | |
4217 | ||
516fb7f2 LT |
4218 | /* |
4219 | * This also sets the "private" pointer to non-NULL if the | |
4220 | * kernel pointers should be hidden (so you can just test | |
4221 | * "m->private" to see if you should keep the values private). | |
4222 | * | |
4223 | * We use the same logic as for /proc/kallsyms. | |
4224 | */ | |
3b5d5c6b AD |
4225 | static int modules_open(struct inode *inode, struct file *file) |
4226 | { | |
516fb7f2 LT |
4227 | int err = seq_open(file, &modules_op); |
4228 | ||
4229 | if (!err) { | |
4230 | struct seq_file *m = file->private_data; | |
4231 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4232 | } | |
4233 | ||
3f553b30 | 4234 | return err; |
3b5d5c6b AD |
4235 | } |
4236 | ||
4237 | static const struct file_operations proc_modules_operations = { | |
4238 | .open = modules_open, | |
4239 | .read = seq_read, | |
4240 | .llseek = seq_lseek, | |
4241 | .release = seq_release, | |
4242 | }; | |
4243 | ||
4244 | static int __init proc_modules_init(void) | |
4245 | { | |
4246 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4247 | return 0; | |
4248 | } | |
4249 | module_init(proc_modules_init); | |
4250 | #endif | |
4251 | ||
1da177e4 LT |
4252 | /* Given an address, look for it in the module exception tables. */ |
4253 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4254 | { | |
1da177e4 LT |
4255 | const struct exception_table_entry *e = NULL; |
4256 | struct module *mod; | |
4257 | ||
24da1cbf | 4258 | preempt_disable(); |
5ff22646 PZ |
4259 | mod = __module_address(addr); |
4260 | if (!mod) | |
4261 | goto out; | |
22a8bdeb | 4262 | |
5ff22646 PZ |
4263 | if (!mod->num_exentries) |
4264 | goto out; | |
4265 | ||
4266 | e = search_extable(mod->extable, | |
a94c33dd | 4267 | mod->num_exentries, |
5ff22646 PZ |
4268 | addr); |
4269 | out: | |
24da1cbf | 4270 | preempt_enable(); |
1da177e4 | 4271 | |
5ff22646 PZ |
4272 | /* |
4273 | * Now, if we found one, we are running inside it now, hence | |
4274 | * we cannot unload the module, hence no refcnt needed. | |
4275 | */ | |
1da177e4 LT |
4276 | return e; |
4277 | } | |
4278 | ||
4d435f9d | 4279 | /* |
e610499e RR |
4280 | * is_module_address - is this address inside a module? |
4281 | * @addr: the address to check. | |
4282 | * | |
4283 | * See is_module_text_address() if you simply want to see if the address | |
4284 | * is code (not data). | |
4d435f9d | 4285 | */ |
e610499e | 4286 | bool is_module_address(unsigned long addr) |
4d435f9d | 4287 | { |
e610499e | 4288 | bool ret; |
4d435f9d | 4289 | |
24da1cbf | 4290 | preempt_disable(); |
e610499e | 4291 | ret = __module_address(addr) != NULL; |
24da1cbf | 4292 | preempt_enable(); |
4d435f9d | 4293 | |
e610499e | 4294 | return ret; |
4d435f9d IM |
4295 | } |
4296 | ||
e610499e RR |
4297 | /* |
4298 | * __module_address - get the module which contains an address. | |
4299 | * @addr: the address. | |
4300 | * | |
4301 | * Must be called with preempt disabled or module mutex held so that | |
4302 | * module doesn't get freed during this. | |
4303 | */ | |
714f83d5 | 4304 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4305 | { |
4306 | struct module *mod; | |
4307 | ||
3a642e99 RR |
4308 | if (addr < module_addr_min || addr > module_addr_max) |
4309 | return NULL; | |
4310 | ||
0be964be PZ |
4311 | module_assert_mutex_or_preempt(); |
4312 | ||
6c9692e2 | 4313 | mod = mod_find(addr); |
93c2e105 PZ |
4314 | if (mod) { |
4315 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4316 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4317 | mod = NULL; |
0d21b0e3 | 4318 | } |
93c2e105 | 4319 | return mod; |
1da177e4 | 4320 | } |
c6b37801 | 4321 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4322 | |
e610499e RR |
4323 | /* |
4324 | * is_module_text_address - is this address inside module code? | |
4325 | * @addr: the address to check. | |
4326 | * | |
4327 | * See is_module_address() if you simply want to see if the address is | |
4328 | * anywhere in a module. See kernel_text_address() for testing if an | |
4329 | * address corresponds to kernel or module code. | |
4330 | */ | |
4331 | bool is_module_text_address(unsigned long addr) | |
4332 | { | |
4333 | bool ret; | |
4334 | ||
4335 | preempt_disable(); | |
4336 | ret = __module_text_address(addr) != NULL; | |
4337 | preempt_enable(); | |
4338 | ||
4339 | return ret; | |
4340 | } | |
4341 | ||
4342 | /* | |
4343 | * __module_text_address - get the module whose code contains an address. | |
4344 | * @addr: the address. | |
4345 | * | |
4346 | * Must be called with preempt disabled or module mutex held so that | |
4347 | * module doesn't get freed during this. | |
4348 | */ | |
4349 | struct module *__module_text_address(unsigned long addr) | |
4350 | { | |
4351 | struct module *mod = __module_address(addr); | |
4352 | if (mod) { | |
4353 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4354 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4355 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4356 | mod = NULL; |
4357 | } | |
4358 | return mod; | |
4359 | } | |
c6b37801 | 4360 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4361 | |
1da177e4 LT |
4362 | /* Don't grab lock, we're oopsing. */ |
4363 | void print_modules(void) | |
4364 | { | |
4365 | struct module *mod; | |
7fd8329b | 4366 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4367 | |
b231125a | 4368 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4369 | /* Most callers should already have preempt disabled, but make sure */ |
4370 | preempt_disable(); | |
0d21b0e3 RR |
4371 | list_for_each_entry_rcu(mod, &modules, list) { |
4372 | if (mod->state == MODULE_STATE_UNFORMED) | |
4373 | continue; | |
27bba4d6 | 4374 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4375 | } |
d72b3751 | 4376 | preempt_enable(); |
e14af7ee | 4377 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4378 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4379 | pr_cont("\n"); | |
1da177e4 LT |
4380 | } |
4381 | ||
1da177e4 | 4382 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4383 | /* Generate the signature for all relevant module structures here. |
4384 | * If these change, we don't want to try to parse the module. */ | |
4385 | void module_layout(struct module *mod, | |
4386 | struct modversion_info *ver, | |
4387 | struct kernel_param *kp, | |
4388 | struct kernel_symbol *ks, | |
65498646 | 4389 | struct tracepoint * const *tp) |
8c8ef42a RR |
4390 | { |
4391 | } | |
4392 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4393 | #endif |