]>
Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f71d20e9 | 2 | /* |
1da177e4 | 3 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 4 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 | 5 | |
1da177e4 | 6 | */ |
9984de1a | 7 | #include <linux/export.h> |
8a293be0 | 8 | #include <linux/extable.h> |
1da177e4 | 9 | #include <linux/moduleloader.h> |
af658dca | 10 | #include <linux/trace_events.h> |
1da177e4 | 11 | #include <linux/init.h> |
ae84e324 | 12 | #include <linux/kallsyms.h> |
34e1169d | 13 | #include <linux/file.h> |
3b5d5c6b | 14 | #include <linux/fs.h> |
6d760133 | 15 | #include <linux/sysfs.h> |
9f158333 | 16 | #include <linux/kernel.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/elf.h> | |
3b5d5c6b | 20 | #include <linux/proc_fs.h> |
2e72d51b | 21 | #include <linux/security.h> |
1da177e4 LT |
22 | #include <linux/seq_file.h> |
23 | #include <linux/syscalls.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/rcupdate.h> | |
c59ede7b | 26 | #include <linux/capability.h> |
1da177e4 LT |
27 | #include <linux/cpu.h> |
28 | #include <linux/moduleparam.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/vermagic.h> | |
32 | #include <linux/notifier.h> | |
f6a57033 | 33 | #include <linux/sched.h> |
1da177e4 | 34 | #include <linux/device.h> |
c988d2b2 | 35 | #include <linux/string.h> |
97d1f15b | 36 | #include <linux/mutex.h> |
d72b3751 | 37 | #include <linux/rculist.h> |
7c0f6ba6 | 38 | #include <linux/uaccess.h> |
1da177e4 | 39 | #include <asm/cacheflush.h> |
563ec5cb | 40 | #include <linux/set_memory.h> |
eb8cdec4 | 41 | #include <asm/mmu_context.h> |
b817f6fe | 42 | #include <linux/license.h> |
6d762394 | 43 | #include <asm/sections.h> |
97e1c18e | 44 | #include <linux/tracepoint.h> |
90d595fe | 45 | #include <linux/ftrace.h> |
7e545d6e | 46 | #include <linux/livepatch.h> |
22a9d645 | 47 | #include <linux/async.h> |
fbf59bc9 | 48 | #include <linux/percpu.h> |
4f2294b6 | 49 | #include <linux/kmemleak.h> |
bf5438fc | 50 | #include <linux/jump_label.h> |
84e1c6bb | 51 | #include <linux/pfn.h> |
403ed278 | 52 | #include <linux/bsearch.h> |
9d5059c9 | 53 | #include <linux/dynamic_debug.h> |
ca86cad7 | 54 | #include <linux/audit.h> |
2f3238ae | 55 | #include <uapi/linux/module.h> |
106a4ee2 | 56 | #include "module-internal.h" |
1da177e4 | 57 | |
7ead8b83 LZ |
58 | #define CREATE_TRACE_POINTS |
59 | #include <trace/events/module.h> | |
60 | ||
1da177e4 LT |
61 | #ifndef ARCH_SHF_SMALL |
62 | #define ARCH_SHF_SMALL 0 | |
63 | #endif | |
64 | ||
84e1c6bb MC |
65 | /* |
66 | * Modules' sections will be aligned on page boundaries | |
67 | * to ensure complete separation of code and data, but | |
0f5bf6d0 | 68 | * only when CONFIG_STRICT_MODULE_RWX=y |
84e1c6bb | 69 | */ |
0f5bf6d0 | 70 | #ifdef CONFIG_STRICT_MODULE_RWX |
84e1c6bb MC |
71 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
72 | #else | |
73 | # define debug_align(X) (X) | |
74 | #endif | |
75 | ||
1da177e4 LT |
76 | /* If this is set, the section belongs in the init part of the module */ |
77 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
78 | ||
75676500 RR |
79 | /* |
80 | * Mutex protects: | |
81 | * 1) List of modules (also safely readable with preempt_disable), | |
82 | * 2) module_use links, | |
83 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 84 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
85 | DEFINE_MUTEX(module_mutex); |
86 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 87 | static LIST_HEAD(modules); |
67fc4e0c | 88 | |
1a7b7d92 RE |
89 | /* Work queue for freeing init sections in success case */ |
90 | static struct work_struct init_free_wq; | |
91 | static struct llist_head init_free_list; | |
92 | ||
6c9692e2 | 93 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 94 | |
93c2e105 PZ |
95 | /* |
96 | * Use a latched RB-tree for __module_address(); this allows us to use | |
97 | * RCU-sched lookups of the address from any context. | |
98 | * | |
6c9692e2 PZ |
99 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
100 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
101 | * NMI context. | |
93c2e105 PZ |
102 | */ |
103 | ||
104 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 105 | { |
7523e4dc | 106 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 107 | |
7523e4dc | 108 | return (unsigned long)layout->base; |
93c2e105 PZ |
109 | } |
110 | ||
111 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
112 | { | |
7523e4dc | 113 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 114 | |
7523e4dc | 115 | return (unsigned long)layout->size; |
93c2e105 PZ |
116 | } |
117 | ||
118 | static __always_inline bool | |
119 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
120 | { | |
121 | return __mod_tree_val(a) < __mod_tree_val(b); | |
122 | } | |
123 | ||
124 | static __always_inline int | |
125 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
126 | { | |
127 | unsigned long val = (unsigned long)key; | |
128 | unsigned long start, end; | |
129 | ||
130 | start = __mod_tree_val(n); | |
131 | if (val < start) | |
132 | return -1; | |
133 | ||
134 | end = start + __mod_tree_size(n); | |
135 | if (val >= end) | |
136 | return 1; | |
106a4ee2 | 137 | |
106a4ee2 RR |
138 | return 0; |
139 | } | |
140 | ||
93c2e105 PZ |
141 | static const struct latch_tree_ops mod_tree_ops = { |
142 | .less = mod_tree_less, | |
143 | .comp = mod_tree_comp, | |
144 | }; | |
145 | ||
4f666546 PZ |
146 | static struct mod_tree_root { |
147 | struct latch_tree_root root; | |
148 | unsigned long addr_min; | |
149 | unsigned long addr_max; | |
150 | } mod_tree __cacheline_aligned = { | |
151 | .addr_min = -1UL, | |
106a4ee2 | 152 | }; |
106a4ee2 | 153 | |
4f666546 PZ |
154 | #define module_addr_min mod_tree.addr_min |
155 | #define module_addr_max mod_tree.addr_max | |
156 | ||
157 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
158 | { | |
159 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
160 | } | |
161 | ||
162 | static void __mod_tree_remove(struct mod_tree_node *node) | |
163 | { | |
164 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
165 | } | |
93c2e105 PZ |
166 | |
167 | /* | |
168 | * These modifications: insert, remove_init and remove; are serialized by the | |
169 | * module_mutex. | |
170 | */ | |
171 | static void mod_tree_insert(struct module *mod) | |
172 | { | |
7523e4dc RR |
173 | mod->core_layout.mtn.mod = mod; |
174 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 175 | |
7523e4dc RR |
176 | __mod_tree_insert(&mod->core_layout.mtn); |
177 | if (mod->init_layout.size) | |
178 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
179 | } |
180 | ||
181 | static void mod_tree_remove_init(struct module *mod) | |
182 | { | |
7523e4dc RR |
183 | if (mod->init_layout.size) |
184 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
185 | } |
186 | ||
187 | static void mod_tree_remove(struct module *mod) | |
188 | { | |
7523e4dc | 189 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
190 | mod_tree_remove_init(mod); |
191 | } | |
192 | ||
6c9692e2 | 193 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
194 | { |
195 | struct latch_tree_node *ltn; | |
196 | ||
4f666546 | 197 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
198 | if (!ltn) |
199 | return NULL; | |
200 | ||
201 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
202 | } | |
203 | ||
6c9692e2 PZ |
204 | #else /* MODULES_TREE_LOOKUP */ |
205 | ||
4f666546 PZ |
206 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
207 | ||
6c9692e2 PZ |
208 | static void mod_tree_insert(struct module *mod) { } |
209 | static void mod_tree_remove_init(struct module *mod) { } | |
210 | static void mod_tree_remove(struct module *mod) { } | |
211 | ||
212 | static struct module *mod_find(unsigned long addr) | |
213 | { | |
214 | struct module *mod; | |
215 | ||
216 | list_for_each_entry_rcu(mod, &modules, list) { | |
217 | if (within_module(addr, mod)) | |
218 | return mod; | |
219 | } | |
220 | ||
221 | return NULL; | |
222 | } | |
223 | ||
224 | #endif /* MODULES_TREE_LOOKUP */ | |
225 | ||
4f666546 PZ |
226 | /* |
227 | * Bounds of module text, for speeding up __module_address. | |
228 | * Protected by module_mutex. | |
229 | */ | |
230 | static void __mod_update_bounds(void *base, unsigned int size) | |
231 | { | |
232 | unsigned long min = (unsigned long)base; | |
233 | unsigned long max = min + size; | |
234 | ||
235 | if (min < module_addr_min) | |
236 | module_addr_min = min; | |
237 | if (max > module_addr_max) | |
238 | module_addr_max = max; | |
239 | } | |
240 | ||
241 | static void mod_update_bounds(struct module *mod) | |
242 | { | |
7523e4dc RR |
243 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
244 | if (mod->init_layout.size) | |
245 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
246 | } |
247 | ||
67fc4e0c JW |
248 | #ifdef CONFIG_KGDB_KDB |
249 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
250 | #endif /* CONFIG_KGDB_KDB */ | |
251 | ||
0be964be PZ |
252 | static void module_assert_mutex(void) |
253 | { | |
254 | lockdep_assert_held(&module_mutex); | |
255 | } | |
256 | ||
257 | static void module_assert_mutex_or_preempt(void) | |
258 | { | |
259 | #ifdef CONFIG_LOCKDEP | |
260 | if (unlikely(!debug_locks)) | |
261 | return; | |
262 | ||
9502514f | 263 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
264 | !lockdep_is_held(&module_mutex)); |
265 | #endif | |
266 | } | |
267 | ||
6727bb9c | 268 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 269 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 270 | |
fda784e5 BM |
271 | /* |
272 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
273 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
274 | */ | |
275 | bool is_module_sig_enforced(void) | |
276 | { | |
277 | return sig_enforce; | |
278 | } | |
279 | EXPORT_SYMBOL(is_module_sig_enforced); | |
280 | ||
8db5da0b MZ |
281 | void set_module_sig_enforced(void) |
282 | { | |
283 | sig_enforce = true; | |
284 | } | |
285 | ||
19e4529e SR |
286 | /* Block module loading/unloading? */ |
287 | int modules_disabled = 0; | |
02608bef | 288 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 289 | |
c9a3ba55 RR |
290 | /* Waiting for a module to finish initializing? */ |
291 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
292 | ||
e041c683 | 293 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 294 | |
6da0b565 | 295 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 296 | { |
e041c683 | 297 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
298 | } |
299 | EXPORT_SYMBOL(register_module_notifier); | |
300 | ||
6da0b565 | 301 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 302 | { |
e041c683 | 303 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
304 | } |
305 | EXPORT_SYMBOL(unregister_module_notifier); | |
306 | ||
71d9f507 MB |
307 | /* |
308 | * We require a truly strong try_module_get(): 0 means success. | |
309 | * Otherwise an error is returned due to ongoing or failed | |
310 | * initialization etc. | |
311 | */ | |
1da177e4 LT |
312 | static inline int strong_try_module_get(struct module *mod) |
313 | { | |
0d21b0e3 | 314 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 315 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
316 | return -EBUSY; |
317 | if (try_module_get(mod)) | |
1da177e4 | 318 | return 0; |
c9a3ba55 RR |
319 | else |
320 | return -ENOENT; | |
1da177e4 LT |
321 | } |
322 | ||
373d4d09 RR |
323 | static inline void add_taint_module(struct module *mod, unsigned flag, |
324 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 325 | { |
373d4d09 | 326 | add_taint(flag, lockdep_ok); |
7fd8329b | 327 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
328 | } |
329 | ||
02a3e59a RD |
330 | /* |
331 | * A thread that wants to hold a reference to a module only while it | |
332 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 333 | */ |
bf262dce | 334 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
335 | { |
336 | module_put(mod); | |
337 | do_exit(code); | |
338 | } | |
339 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 340 | |
1da177e4 | 341 | /* Find a module section: 0 means not found. */ |
49668688 | 342 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
343 | { |
344 | unsigned int i; | |
345 | ||
49668688 RR |
346 | for (i = 1; i < info->hdr->e_shnum; i++) { |
347 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 348 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
349 | if ((shdr->sh_flags & SHF_ALLOC) |
350 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 351 | return i; |
49668688 | 352 | } |
1da177e4 LT |
353 | return 0; |
354 | } | |
355 | ||
5e458cc0 | 356 | /* Find a module section, or NULL. */ |
49668688 | 357 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
358 | { |
359 | /* Section 0 has sh_addr 0. */ | |
49668688 | 360 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
361 | } |
362 | ||
363 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 364 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
365 | const char *name, |
366 | size_t object_size, | |
367 | unsigned int *num) | |
368 | { | |
49668688 | 369 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
370 | |
371 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
372 | *num = info->sechdrs[sec].sh_size / object_size; |
373 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
374 | } |
375 | ||
1da177e4 LT |
376 | /* Provided by the linker */ |
377 | extern const struct kernel_symbol __start___ksymtab[]; | |
378 | extern const struct kernel_symbol __stop___ksymtab[]; | |
379 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
380 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
381 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
382 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
383 | extern const s32 __start___kcrctab[]; |
384 | extern const s32 __start___kcrctab_gpl[]; | |
385 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
386 | #ifdef CONFIG_UNUSED_SYMBOLS |
387 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
388 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
389 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
390 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
391 | extern const s32 __start___kcrctab_unused[]; |
392 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 393 | #endif |
1da177e4 LT |
394 | |
395 | #ifndef CONFIG_MODVERSIONS | |
396 | #define symversion(base, idx) NULL | |
397 | #else | |
f83ca9fe | 398 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
399 | #endif |
400 | ||
dafd0940 RR |
401 | static bool each_symbol_in_section(const struct symsearch *arr, |
402 | unsigned int arrsize, | |
403 | struct module *owner, | |
404 | bool (*fn)(const struct symsearch *syms, | |
405 | struct module *owner, | |
de4d8d53 | 406 | void *data), |
dafd0940 | 407 | void *data) |
ad9546c9 | 408 | { |
de4d8d53 | 409 | unsigned int j; |
ad9546c9 | 410 | |
dafd0940 | 411 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
412 | if (fn(&arr[j], owner, data)) |
413 | return true; | |
f71d20e9 | 414 | } |
dafd0940 RR |
415 | |
416 | return false; | |
ad9546c9 RR |
417 | } |
418 | ||
dafd0940 | 419 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
420 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
421 | struct module *owner, | |
422 | void *data), | |
423 | void *data) | |
ad9546c9 RR |
424 | { |
425 | struct module *mod; | |
44032e63 | 426 | static const struct symsearch arr[] = { |
ad9546c9 | 427 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 428 | NOT_GPL_ONLY, false }, |
ad9546c9 | 429 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
430 | __start___kcrctab_gpl, |
431 | GPL_ONLY, false }, | |
ad9546c9 | 432 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
433 | __start___kcrctab_gpl_future, |
434 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 435 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 436 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
437 | __start___kcrctab_unused, |
438 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 439 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
440 | __start___kcrctab_unused_gpl, |
441 | GPL_ONLY, true }, | |
f7f5b675 | 442 | #endif |
ad9546c9 | 443 | }; |
f71d20e9 | 444 | |
0be964be PZ |
445 | module_assert_mutex_or_preempt(); |
446 | ||
dafd0940 RR |
447 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
448 | return true; | |
f71d20e9 | 449 | |
d72b3751 | 450 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
451 | struct symsearch arr[] = { |
452 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 453 | NOT_GPL_ONLY, false }, |
ad9546c9 | 454 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
455 | mod->gpl_crcs, |
456 | GPL_ONLY, false }, | |
ad9546c9 RR |
457 | { mod->gpl_future_syms, |
458 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
459 | mod->gpl_future_crcs, |
460 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 461 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
462 | { mod->unused_syms, |
463 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
464 | mod->unused_crcs, |
465 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
466 | { mod->unused_gpl_syms, |
467 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
468 | mod->unused_gpl_crcs, |
469 | GPL_ONLY, true }, | |
f7f5b675 | 470 | #endif |
ad9546c9 RR |
471 | }; |
472 | ||
0d21b0e3 RR |
473 | if (mod->state == MODULE_STATE_UNFORMED) |
474 | continue; | |
475 | ||
dafd0940 RR |
476 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
477 | return true; | |
478 | } | |
479 | return false; | |
480 | } | |
de4d8d53 | 481 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
482 | |
483 | struct find_symbol_arg { | |
484 | /* Input */ | |
485 | const char *name; | |
486 | bool gplok; | |
487 | bool warn; | |
488 | ||
489 | /* Output */ | |
490 | struct module *owner; | |
71810db2 | 491 | const s32 *crc; |
414fd31b | 492 | const struct kernel_symbol *sym; |
dafd0940 RR |
493 | }; |
494 | ||
2d25bc55 JY |
495 | static bool check_exported_symbol(const struct symsearch *syms, |
496 | struct module *owner, | |
497 | unsigned int symnum, void *data) | |
dafd0940 RR |
498 | { |
499 | struct find_symbol_arg *fsa = data; | |
500 | ||
dafd0940 RR |
501 | if (!fsa->gplok) { |
502 | if (syms->licence == GPL_ONLY) | |
503 | return false; | |
504 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
505 | pr_warn("Symbol %s is being used by a non-GPL module, " |
506 | "which will not be allowed in the future\n", | |
507 | fsa->name); | |
9f28bb7e | 508 | } |
1da177e4 | 509 | } |
ad9546c9 | 510 | |
f7f5b675 | 511 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 512 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
513 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
514 | "using it.\n", fsa->name); | |
515 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
516 | pr_warn("Please evaluate if this is the right api to use and " |
517 | "if it really is, submit a report to the linux kernel " | |
518 | "mailing list together with submitting your code for " | |
bddb12b3 | 519 | "inclusion.\n"); |
dafd0940 | 520 | } |
f7f5b675 | 521 | #endif |
dafd0940 RR |
522 | |
523 | fsa->owner = owner; | |
524 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 525 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
526 | return true; |
527 | } | |
528 | ||
7290d580 AB |
529 | static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
530 | { | |
531 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
532 | return (unsigned long)offset_to_ptr(&sym->value_offset); | |
533 | #else | |
534 | return sym->value; | |
535 | #endif | |
536 | } | |
537 | ||
538 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) | |
539 | { | |
540 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
541 | return offset_to_ptr(&sym->name_offset); | |
542 | #else | |
543 | return sym->name; | |
544 | #endif | |
545 | } | |
546 | ||
403ed278 AIB |
547 | static int cmp_name(const void *va, const void *vb) |
548 | { | |
549 | const char *a; | |
550 | const struct kernel_symbol *b; | |
551 | a = va; b = vb; | |
7290d580 | 552 | return strcmp(a, kernel_symbol_name(b)); |
403ed278 AIB |
553 | } |
554 | ||
2d25bc55 JY |
555 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
556 | struct module *owner, | |
557 | void *data) | |
de4d8d53 RR |
558 | { |
559 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
560 | struct kernel_symbol *sym; |
561 | ||
562 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
563 | sizeof(struct kernel_symbol), cmp_name); | |
564 | ||
2d25bc55 JY |
565 | if (sym != NULL && check_exported_symbol(syms, owner, |
566 | sym - syms->start, data)) | |
403ed278 | 567 | return true; |
de4d8d53 | 568 | |
de4d8d53 RR |
569 | return false; |
570 | } | |
571 | ||
2d25bc55 | 572 | /* Find an exported symbol and return it, along with, (optional) crc and |
75676500 | 573 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
574 | const struct kernel_symbol *find_symbol(const char *name, |
575 | struct module **owner, | |
71810db2 | 576 | const s32 **crc, |
c6b37801 TA |
577 | bool gplok, |
578 | bool warn) | |
dafd0940 RR |
579 | { |
580 | struct find_symbol_arg fsa; | |
581 | ||
582 | fsa.name = name; | |
583 | fsa.gplok = gplok; | |
584 | fsa.warn = warn; | |
585 | ||
2d25bc55 | 586 | if (each_symbol_section(find_exported_symbol_in_section, &fsa)) { |
dafd0940 RR |
587 | if (owner) |
588 | *owner = fsa.owner; | |
589 | if (crc) | |
590 | *crc = fsa.crc; | |
414fd31b | 591 | return fsa.sym; |
dafd0940 RR |
592 | } |
593 | ||
5e124169 | 594 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 595 | return NULL; |
1da177e4 | 596 | } |
c6b37801 | 597 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 598 | |
fe0d34d2 RR |
599 | /* |
600 | * Search for module by name: must hold module_mutex (or preempt disabled | |
601 | * for read-only access). | |
602 | */ | |
4f6de4d5 | 603 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 604 | bool even_unformed) |
1da177e4 LT |
605 | { |
606 | struct module *mod; | |
607 | ||
fe0d34d2 | 608 | module_assert_mutex_or_preempt(); |
0be964be | 609 | |
93437353 | 610 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
611 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
612 | continue; | |
4f6de4d5 | 613 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
614 | return mod; |
615 | } | |
616 | return NULL; | |
617 | } | |
0d21b0e3 RR |
618 | |
619 | struct module *find_module(const char *name) | |
620 | { | |
fe0d34d2 | 621 | module_assert_mutex(); |
4f6de4d5 | 622 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 623 | } |
c6b37801 | 624 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
625 | |
626 | #ifdef CONFIG_SMP | |
fbf59bc9 | 627 | |
259354de | 628 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 629 | { |
259354de TH |
630 | return mod->percpu; |
631 | } | |
fbf59bc9 | 632 | |
9eb76d77 | 633 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 634 | { |
9eb76d77 RR |
635 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
636 | unsigned long align = pcpusec->sh_addralign; | |
637 | ||
638 | if (!pcpusec->sh_size) | |
639 | return 0; | |
640 | ||
fbf59bc9 | 641 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
642 | pr_warn("%s: per-cpu alignment %li > %li\n", |
643 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
644 | align = PAGE_SIZE; |
645 | } | |
646 | ||
9eb76d77 | 647 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 648 | if (!mod->percpu) { |
bddb12b3 AM |
649 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
650 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
651 | return -ENOMEM; |
652 | } | |
9eb76d77 | 653 | mod->percpu_size = pcpusec->sh_size; |
259354de | 654 | return 0; |
fbf59bc9 TH |
655 | } |
656 | ||
259354de | 657 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 658 | { |
259354de | 659 | free_percpu(mod->percpu); |
fbf59bc9 TH |
660 | } |
661 | ||
49668688 | 662 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 663 | { |
49668688 | 664 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
665 | } |
666 | ||
259354de TH |
667 | static void percpu_modcopy(struct module *mod, |
668 | const void *from, unsigned long size) | |
6b588c18 TH |
669 | { |
670 | int cpu; | |
671 | ||
672 | for_each_possible_cpu(cpu) | |
259354de | 673 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
674 | } |
675 | ||
383776fa | 676 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
677 | { |
678 | struct module *mod; | |
679 | unsigned int cpu; | |
680 | ||
681 | preempt_disable(); | |
682 | ||
683 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
684 | if (mod->state == MODULE_STATE_UNFORMED) |
685 | continue; | |
10fad5e4 TH |
686 | if (!mod->percpu_size) |
687 | continue; | |
688 | for_each_possible_cpu(cpu) { | |
689 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 690 | void *va = (void *)addr; |
10fad5e4 | 691 | |
383776fa | 692 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 693 | if (can_addr) { |
383776fa | 694 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
695 | *can_addr += (unsigned long) |
696 | per_cpu_ptr(mod->percpu, | |
697 | get_boot_cpu_id()); | |
698 | } | |
10fad5e4 TH |
699 | preempt_enable(); |
700 | return true; | |
701 | } | |
702 | } | |
703 | } | |
704 | ||
705 | preempt_enable(); | |
706 | return false; | |
6b588c18 TH |
707 | } |
708 | ||
383776fa TG |
709 | /** |
710 | * is_module_percpu_address - test whether address is from module static percpu | |
711 | * @addr: address to test | |
712 | * | |
713 | * Test whether @addr belongs to module static percpu area. | |
714 | * | |
715 | * RETURNS: | |
716 | * %true if @addr is from module static percpu area | |
717 | */ | |
718 | bool is_module_percpu_address(unsigned long addr) | |
719 | { | |
720 | return __is_module_percpu_address(addr, NULL); | |
721 | } | |
722 | ||
1da177e4 | 723 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 724 | |
259354de | 725 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
726 | { |
727 | return NULL; | |
728 | } | |
9eb76d77 | 729 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 730 | { |
9eb76d77 RR |
731 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
732 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
733 | return -ENOMEM; | |
734 | return 0; | |
259354de TH |
735 | } |
736 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 737 | { |
1da177e4 | 738 | } |
49668688 | 739 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
740 | { |
741 | return 0; | |
742 | } | |
259354de TH |
743 | static inline void percpu_modcopy(struct module *mod, |
744 | const void *from, unsigned long size) | |
1da177e4 LT |
745 | { |
746 | /* pcpusec should be 0, and size of that section should be 0. */ | |
747 | BUG_ON(size != 0); | |
748 | } | |
10fad5e4 TH |
749 | bool is_module_percpu_address(unsigned long addr) |
750 | { | |
751 | return false; | |
752 | } | |
6b588c18 | 753 | |
383776fa TG |
754 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
755 | { | |
756 | return false; | |
757 | } | |
758 | ||
1da177e4 LT |
759 | #endif /* CONFIG_SMP */ |
760 | ||
c988d2b2 MD |
761 | #define MODINFO_ATTR(field) \ |
762 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
763 | { \ | |
764 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
765 | } \ | |
766 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 767 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 768 | { \ |
cc56ded3 | 769 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
770 | } \ |
771 | static int modinfo_##field##_exists(struct module *mod) \ | |
772 | { \ | |
773 | return mod->field != NULL; \ | |
774 | } \ | |
775 | static void free_modinfo_##field(struct module *mod) \ | |
776 | { \ | |
22a8bdeb DW |
777 | kfree(mod->field); \ |
778 | mod->field = NULL; \ | |
c988d2b2 MD |
779 | } \ |
780 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 781 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
782 | .show = show_modinfo_##field, \ |
783 | .setup = setup_modinfo_##field, \ | |
784 | .test = modinfo_##field##_exists, \ | |
785 | .free = free_modinfo_##field, \ | |
786 | }; | |
787 | ||
788 | MODINFO_ATTR(version); | |
789 | MODINFO_ATTR(srcversion); | |
790 | ||
e14af7ee AV |
791 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
792 | ||
03e88ae1 | 793 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
794 | |
795 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
796 | ||
e513cc1c MH |
797 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
798 | #define MODULE_REF_BASE 1 | |
799 | ||
1da177e4 | 800 | /* Init the unload section of the module. */ |
9f85a4bb | 801 | static int module_unload_init(struct module *mod) |
1da177e4 | 802 | { |
e513cc1c MH |
803 | /* |
804 | * Initialize reference counter to MODULE_REF_BASE. | |
805 | * refcnt == 0 means module is going. | |
806 | */ | |
807 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 808 | |
2c02dfe7 LT |
809 | INIT_LIST_HEAD(&mod->source_list); |
810 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 811 | |
1da177e4 | 812 | /* Hold reference count during initialization. */ |
e513cc1c | 813 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
814 | |
815 | return 0; | |
1da177e4 LT |
816 | } |
817 | ||
1da177e4 LT |
818 | /* Does a already use b? */ |
819 | static int already_uses(struct module *a, struct module *b) | |
820 | { | |
821 | struct module_use *use; | |
822 | ||
2c02dfe7 LT |
823 | list_for_each_entry(use, &b->source_list, source_list) { |
824 | if (use->source == a) { | |
5e124169 | 825 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
826 | return 1; |
827 | } | |
828 | } | |
5e124169 | 829 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
830 | return 0; |
831 | } | |
832 | ||
2c02dfe7 LT |
833 | /* |
834 | * Module a uses b | |
835 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
836 | * - the module_use is added to the list of 'b' sources (so | |
837 | * 'b' can walk the list to see who sourced them), and of 'a' | |
838 | * targets (so 'a' can see what modules it targets). | |
839 | */ | |
840 | static int add_module_usage(struct module *a, struct module *b) | |
841 | { | |
2c02dfe7 LT |
842 | struct module_use *use; |
843 | ||
5e124169 | 844 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 845 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 846 | if (!use) |
2c02dfe7 | 847 | return -ENOMEM; |
2c02dfe7 LT |
848 | |
849 | use->source = a; | |
850 | use->target = b; | |
851 | list_add(&use->source_list, &b->source_list); | |
852 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
853 | return 0; |
854 | } | |
855 | ||
75676500 | 856 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 857 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 858 | { |
c8e21ced | 859 | int err; |
270a6c4c | 860 | |
9bea7f23 | 861 | if (b == NULL || already_uses(a, b)) |
218ce735 | 862 | return 0; |
218ce735 | 863 | |
9bea7f23 RR |
864 | /* If module isn't available, we fail. */ |
865 | err = strong_try_module_get(b); | |
c9a3ba55 | 866 | if (err) |
9bea7f23 | 867 | return err; |
1da177e4 | 868 | |
2c02dfe7 LT |
869 | err = add_module_usage(a, b); |
870 | if (err) { | |
1da177e4 | 871 | module_put(b); |
9bea7f23 | 872 | return err; |
1da177e4 | 873 | } |
9bea7f23 | 874 | return 0; |
1da177e4 | 875 | } |
9bea7f23 | 876 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
877 | |
878 | /* Clear the unload stuff of the module. */ | |
879 | static void module_unload_free(struct module *mod) | |
880 | { | |
2c02dfe7 | 881 | struct module_use *use, *tmp; |
1da177e4 | 882 | |
75676500 | 883 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
884 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
885 | struct module *i = use->target; | |
5e124169 | 886 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
887 | module_put(i); |
888 | list_del(&use->source_list); | |
889 | list_del(&use->target_list); | |
890 | kfree(use); | |
1da177e4 | 891 | } |
75676500 | 892 | mutex_unlock(&module_mutex); |
1da177e4 LT |
893 | } |
894 | ||
895 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 896 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
897 | { |
898 | int ret = (flags & O_TRUNC); | |
899 | if (ret) | |
373d4d09 | 900 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
901 | return ret; |
902 | } | |
903 | #else | |
fb169793 | 904 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
905 | { |
906 | return 0; | |
907 | } | |
908 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
909 | ||
e513cc1c MH |
910 | /* Try to release refcount of module, 0 means success. */ |
911 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 912 | { |
e513cc1c | 913 | int ret; |
1da177e4 | 914 | |
e513cc1c MH |
915 | /* Try to decrement refcnt which we set at loading */ |
916 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
917 | BUG_ON(ret < 0); | |
918 | if (ret) | |
919 | /* Someone can put this right now, recover with checking */ | |
920 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 921 | |
e513cc1c MH |
922 | return ret; |
923 | } | |
1da177e4 | 924 | |
e513cc1c MH |
925 | static int try_stop_module(struct module *mod, int flags, int *forced) |
926 | { | |
da39ba5e | 927 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
928 | if (try_release_module_ref(mod) != 0) { |
929 | *forced = try_force_unload(flags); | |
930 | if (!(*forced)) | |
1da177e4 LT |
931 | return -EWOULDBLOCK; |
932 | } | |
933 | ||
934 | /* Mark it as dying. */ | |
e513cc1c | 935 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 936 | |
e513cc1c | 937 | return 0; |
1da177e4 LT |
938 | } |
939 | ||
d5db139a RR |
940 | /** |
941 | * module_refcount - return the refcount or -1 if unloading | |
942 | * | |
943 | * @mod: the module we're checking | |
944 | * | |
945 | * Returns: | |
946 | * -1 if the module is in the process of unloading | |
947 | * otherwise the number of references in the kernel to the module | |
948 | */ | |
949 | int module_refcount(struct module *mod) | |
1da177e4 | 950 | { |
d5db139a | 951 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
952 | } |
953 | EXPORT_SYMBOL(module_refcount); | |
954 | ||
955 | /* This exists whether we can unload or not */ | |
956 | static void free_module(struct module *mod); | |
957 | ||
17da2bd9 HC |
958 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
959 | unsigned int, flags) | |
1da177e4 LT |
960 | { |
961 | struct module *mod; | |
dfff0a06 | 962 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
963 | int ret, forced = 0; |
964 | ||
3d43321b | 965 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
966 | return -EPERM; |
967 | ||
968 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
969 | return -EFAULT; | |
970 | name[MODULE_NAME_LEN-1] = '\0'; | |
971 | ||
f6276ac9 RGB |
972 | audit_log_kern_module(name); |
973 | ||
3fc1f1e2 TH |
974 | if (mutex_lock_interruptible(&module_mutex) != 0) |
975 | return -EINTR; | |
1da177e4 LT |
976 | |
977 | mod = find_module(name); | |
978 | if (!mod) { | |
979 | ret = -ENOENT; | |
980 | goto out; | |
981 | } | |
982 | ||
2c02dfe7 | 983 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
984 | /* Other modules depend on us: get rid of them first. */ |
985 | ret = -EWOULDBLOCK; | |
986 | goto out; | |
987 | } | |
988 | ||
989 | /* Doing init or already dying? */ | |
990 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 991 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 992 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
993 | ret = -EBUSY; |
994 | goto out; | |
995 | } | |
996 | ||
997 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 998 | if (mod->init && !mod->exit) { |
fb169793 | 999 | forced = try_force_unload(flags); |
1da177e4 LT |
1000 | if (!forced) { |
1001 | /* This module can't be removed */ | |
1002 | ret = -EBUSY; | |
1003 | goto out; | |
1004 | } | |
1005 | } | |
1006 | ||
1da177e4 LT |
1007 | /* Stop the machine so refcounts can't move and disable module. */ |
1008 | ret = try_stop_module(mod, flags, &forced); | |
1009 | if (ret != 0) | |
1010 | goto out; | |
1011 | ||
df4b565e | 1012 | mutex_unlock(&module_mutex); |
25985edc | 1013 | /* Final destruction now no one is using it. */ |
df4b565e | 1014 | if (mod->exit != NULL) |
1da177e4 | 1015 | mod->exit(); |
df4b565e PO |
1016 | blocking_notifier_call_chain(&module_notify_list, |
1017 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1018 | klp_module_going(mod); |
7dcd182b JY |
1019 | ftrace_release_mod(mod); |
1020 | ||
22a9d645 | 1021 | async_synchronize_full(); |
75676500 | 1022 | |
e14af7ee | 1023 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1024 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1025 | |
75676500 RR |
1026 | free_module(mod); |
1027 | return 0; | |
1028 | out: | |
6389a385 | 1029 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1030 | return ret; |
1031 | } | |
1032 | ||
d1e99d7a | 1033 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1034 | { |
1035 | struct module_use *use; | |
1036 | int printed_something = 0; | |
1037 | ||
d5db139a | 1038 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1039 | |
6da0b565 IA |
1040 | /* |
1041 | * Always include a trailing , so userspace can differentiate | |
1042 | * between this and the old multi-field proc format. | |
1043 | */ | |
2c02dfe7 | 1044 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1045 | printed_something = 1; |
2c02dfe7 | 1046 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1047 | } |
1048 | ||
1da177e4 LT |
1049 | if (mod->init != NULL && mod->exit == NULL) { |
1050 | printed_something = 1; | |
6da0b565 | 1051 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1052 | } |
1053 | ||
1054 | if (!printed_something) | |
6da0b565 | 1055 | seq_puts(m, "-"); |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | void __symbol_put(const char *symbol) | |
1059 | { | |
1060 | struct module *owner; | |
1da177e4 | 1061 | |
24da1cbf | 1062 | preempt_disable(); |
414fd31b | 1063 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1064 | BUG(); |
1065 | module_put(owner); | |
24da1cbf | 1066 | preempt_enable(); |
1da177e4 LT |
1067 | } |
1068 | EXPORT_SYMBOL(__symbol_put); | |
1069 | ||
7d1d16e4 | 1070 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1071 | void symbol_put_addr(void *addr) |
1072 | { | |
5e376613 | 1073 | struct module *modaddr; |
7d1d16e4 | 1074 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1075 | |
7d1d16e4 | 1076 | if (core_kernel_text(a)) |
5e376613 | 1077 | return; |
1da177e4 | 1078 | |
275d7d44 PZ |
1079 | /* |
1080 | * Even though we hold a reference on the module; we still need to | |
1081 | * disable preemption in order to safely traverse the data structure. | |
1082 | */ | |
1083 | preempt_disable(); | |
7d1d16e4 | 1084 | modaddr = __module_text_address(a); |
a6e6abd5 | 1085 | BUG_ON(!modaddr); |
5e376613 | 1086 | module_put(modaddr); |
275d7d44 | 1087 | preempt_enable(); |
1da177e4 LT |
1088 | } |
1089 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1090 | ||
1091 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1092 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1093 | { |
d5db139a | 1094 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1095 | } |
1096 | ||
cca3e707 KS |
1097 | static struct module_attribute modinfo_refcnt = |
1098 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1099 | |
d53799be SR |
1100 | void __module_get(struct module *module) |
1101 | { | |
1102 | if (module) { | |
1103 | preempt_disable(); | |
2f35c41f | 1104 | atomic_inc(&module->refcnt); |
d53799be SR |
1105 | trace_module_get(module, _RET_IP_); |
1106 | preempt_enable(); | |
1107 | } | |
1108 | } | |
1109 | EXPORT_SYMBOL(__module_get); | |
1110 | ||
1111 | bool try_module_get(struct module *module) | |
1112 | { | |
1113 | bool ret = true; | |
1114 | ||
1115 | if (module) { | |
1116 | preempt_disable(); | |
e513cc1c MH |
1117 | /* Note: here, we can fail to get a reference */ |
1118 | if (likely(module_is_live(module) && | |
1119 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1120 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1121 | else |
d53799be SR |
1122 | ret = false; |
1123 | ||
1124 | preempt_enable(); | |
1125 | } | |
1126 | return ret; | |
1127 | } | |
1128 | EXPORT_SYMBOL(try_module_get); | |
1129 | ||
f6a57033 AV |
1130 | void module_put(struct module *module) |
1131 | { | |
e513cc1c MH |
1132 | int ret; |
1133 | ||
f6a57033 | 1134 | if (module) { |
e1783a24 | 1135 | preempt_disable(); |
e513cc1c MH |
1136 | ret = atomic_dec_if_positive(&module->refcnt); |
1137 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1138 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1139 | preempt_enable(); |
f6a57033 AV |
1140 | } |
1141 | } | |
1142 | EXPORT_SYMBOL(module_put); | |
1143 | ||
1da177e4 | 1144 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1145 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1146 | { |
1147 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1148 | seq_puts(m, " - -"); |
1da177e4 LT |
1149 | } |
1150 | ||
1151 | static inline void module_unload_free(struct module *mod) | |
1152 | { | |
1153 | } | |
1154 | ||
9bea7f23 | 1155 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1156 | { |
9bea7f23 | 1157 | return strong_try_module_get(b); |
1da177e4 | 1158 | } |
9bea7f23 | 1159 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1160 | |
9f85a4bb | 1161 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1162 | { |
9f85a4bb | 1163 | return 0; |
1da177e4 LT |
1164 | } |
1165 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1166 | ||
53999bf3 KW |
1167 | static size_t module_flags_taint(struct module *mod, char *buf) |
1168 | { | |
1169 | size_t l = 0; | |
7fd8329b PM |
1170 | int i; |
1171 | ||
1172 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1173 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1174 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1175 | } |
53999bf3 | 1176 | |
53999bf3 KW |
1177 | return l; |
1178 | } | |
1179 | ||
1f71740a | 1180 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1181 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1182 | { |
1183 | const char *state = "unknown"; | |
1184 | ||
4befb026 | 1185 | switch (mk->mod->state) { |
1f71740a KS |
1186 | case MODULE_STATE_LIVE: |
1187 | state = "live"; | |
1188 | break; | |
1189 | case MODULE_STATE_COMING: | |
1190 | state = "coming"; | |
1191 | break; | |
1192 | case MODULE_STATE_GOING: | |
1193 | state = "going"; | |
1194 | break; | |
0d21b0e3 RR |
1195 | default: |
1196 | BUG(); | |
1f71740a KS |
1197 | } |
1198 | return sprintf(buffer, "%s\n", state); | |
1199 | } | |
1200 | ||
cca3e707 KS |
1201 | static struct module_attribute modinfo_initstate = |
1202 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1203 | |
88bfa324 KS |
1204 | static ssize_t store_uevent(struct module_attribute *mattr, |
1205 | struct module_kobject *mk, | |
1206 | const char *buffer, size_t count) | |
1207 | { | |
df44b479 PR |
1208 | int rc; |
1209 | ||
1210 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1211 | return rc ? rc : count; | |
88bfa324 KS |
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(); | |
996302c5 | 1342 | if (!find_symbol("module_layout", NULL, &crc, true, false)) { |
926a59b1 | 1343 | preempt_enable(); |
1da177e4 | 1344 | BUG(); |
926a59b1 PZ |
1345 | } |
1346 | preempt_enable(); | |
996302c5 | 1347 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1348 | } |
1349 | ||
91e37a79 RR |
1350 | /* First part is kernel version, which we ignore if module has crcs. */ |
1351 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1352 | bool has_crcs) | |
1da177e4 | 1353 | { |
91e37a79 RR |
1354 | if (has_crcs) { |
1355 | amagic += strcspn(amagic, " "); | |
1356 | bmagic += strcspn(bmagic, " "); | |
1357 | } | |
1da177e4 LT |
1358 | return strcmp(amagic, bmagic) == 0; |
1359 | } | |
1360 | #else | |
49019426 | 1361 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1362 | const char *symname, |
6da0b565 | 1363 | struct module *mod, |
71810db2 | 1364 | const s32 *crc) |
1da177e4 LT |
1365 | { |
1366 | return 1; | |
1367 | } | |
1368 | ||
49019426 | 1369 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1370 | struct module *mod) |
1371 | { | |
1372 | return 1; | |
1373 | } | |
1374 | ||
91e37a79 RR |
1375 | static inline int same_magic(const char *amagic, const char *bmagic, |
1376 | bool has_crcs) | |
1da177e4 LT |
1377 | { |
1378 | return strcmp(amagic, bmagic) == 0; | |
1379 | } | |
1380 | #endif /* CONFIG_MODVERSIONS */ | |
1381 | ||
75676500 | 1382 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1383 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1384 | const struct load_info *info, | |
414fd31b | 1385 | const char *name, |
9bea7f23 | 1386 | char ownername[]) |
1da177e4 LT |
1387 | { |
1388 | struct module *owner; | |
414fd31b | 1389 | const struct kernel_symbol *sym; |
71810db2 | 1390 | const s32 *crc; |
9bea7f23 | 1391 | int err; |
1da177e4 | 1392 | |
d64810f5 PZ |
1393 | /* |
1394 | * The module_mutex should not be a heavily contended lock; | |
1395 | * if we get the occasional sleep here, we'll go an extra iteration | |
1396 | * in the wait_event_interruptible(), which is harmless. | |
1397 | */ | |
1398 | sched_annotate_sleep(); | |
75676500 | 1399 | mutex_lock(&module_mutex); |
414fd31b | 1400 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1401 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1402 | if (!sym) |
1403 | goto unlock; | |
1404 | ||
49019426 | 1405 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1406 | sym = ERR_PTR(-EINVAL); |
1407 | goto getname; | |
1da177e4 | 1408 | } |
9bea7f23 RR |
1409 | |
1410 | err = ref_module(mod, owner); | |
1411 | if (err) { | |
1412 | sym = ERR_PTR(err); | |
1413 | goto getname; | |
1414 | } | |
1415 | ||
1416 | getname: | |
1417 | /* We must make copy under the lock if we failed to get ref. */ | |
1418 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1419 | unlock: | |
75676500 | 1420 | mutex_unlock(&module_mutex); |
218ce735 | 1421 | return sym; |
1da177e4 LT |
1422 | } |
1423 | ||
49668688 RR |
1424 | static const struct kernel_symbol * |
1425 | resolve_symbol_wait(struct module *mod, | |
1426 | const struct load_info *info, | |
1427 | const char *name) | |
9bea7f23 RR |
1428 | { |
1429 | const struct kernel_symbol *ksym; | |
49668688 | 1430 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1431 | |
1432 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1433 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1434 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1435 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1436 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1437 | mod->name, owner); | |
9bea7f23 RR |
1438 | } |
1439 | return ksym; | |
1440 | } | |
1441 | ||
1da177e4 LT |
1442 | /* |
1443 | * /sys/module/foo/sections stuff | |
1444 | * J. Corbet <corbet@lwn.net> | |
1445 | */ | |
8f6d0378 | 1446 | #ifdef CONFIG_SYSFS |
10b465aa | 1447 | |
8f6d0378 | 1448 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1449 | static inline bool sect_empty(const Elf_Shdr *sect) |
1450 | { | |
1451 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1452 | } | |
1453 | ||
6da0b565 | 1454 | struct module_sect_attr { |
a58730c4 RR |
1455 | struct module_attribute mattr; |
1456 | char *name; | |
1457 | unsigned long address; | |
1458 | }; | |
1459 | ||
6da0b565 | 1460 | struct module_sect_attrs { |
a58730c4 RR |
1461 | struct attribute_group grp; |
1462 | unsigned int nsections; | |
1463 | struct module_sect_attr attrs[0]; | |
1464 | }; | |
1465 | ||
1da177e4 | 1466 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1467 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1468 | { |
1469 | struct module_sect_attr *sattr = | |
1470 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1471 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1472 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1473 | } |
1474 | ||
04b1db9f IN |
1475 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1476 | { | |
a58730c4 | 1477 | unsigned int section; |
04b1db9f IN |
1478 | |
1479 | for (section = 0; section < sect_attrs->nsections; section++) | |
1480 | kfree(sect_attrs->attrs[section].name); | |
1481 | kfree(sect_attrs); | |
1482 | } | |
1483 | ||
8f6d0378 | 1484 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1485 | { |
1486 | unsigned int nloaded = 0, i, size[2]; | |
1487 | struct module_sect_attrs *sect_attrs; | |
1488 | struct module_sect_attr *sattr; | |
1489 | struct attribute **gattr; | |
22a8bdeb | 1490 | |
1da177e4 | 1491 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1492 | for (i = 0; i < info->hdr->e_shnum; i++) |
1493 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1494 | nloaded++; |
1495 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1496 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1497 | sizeof(sect_attrs->grp.attrs[0])); | |
1498 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1499 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1500 | if (sect_attrs == NULL) | |
1da177e4 LT |
1501 | return; |
1502 | ||
1503 | /* Setup section attributes. */ | |
1504 | sect_attrs->grp.name = "sections"; | |
1505 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1506 | ||
04b1db9f | 1507 | sect_attrs->nsections = 0; |
1da177e4 LT |
1508 | sattr = §_attrs->attrs[0]; |
1509 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1510 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1511 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1512 | if (sect_empty(sec)) | |
35dead42 | 1513 | continue; |
8f6d0378 RR |
1514 | sattr->address = sec->sh_addr; |
1515 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1516 | GFP_KERNEL); |
1517 | if (sattr->name == NULL) | |
1518 | goto out; | |
1519 | sect_attrs->nsections++; | |
361795b1 | 1520 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1521 | sattr->mattr.show = module_sect_show; |
1522 | sattr->mattr.store = NULL; | |
1523 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1524 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1525 | *(gattr++) = &(sattr++)->mattr.attr; |
1526 | } | |
1527 | *gattr = NULL; | |
1528 | ||
1529 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1530 | goto out; | |
1531 | ||
1532 | mod->sect_attrs = sect_attrs; | |
1533 | return; | |
1534 | out: | |
04b1db9f | 1535 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1536 | } |
1537 | ||
1538 | static void remove_sect_attrs(struct module *mod) | |
1539 | { | |
1540 | if (mod->sect_attrs) { | |
1541 | sysfs_remove_group(&mod->mkobj.kobj, | |
1542 | &mod->sect_attrs->grp); | |
1543 | /* We are positive that no one is using any sect attrs | |
1544 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1545 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1546 | mod->sect_attrs = NULL; |
1547 | } | |
1548 | } | |
1549 | ||
6d760133 RM |
1550 | /* |
1551 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1552 | */ | |
1553 | ||
1554 | struct module_notes_attrs { | |
1555 | struct kobject *dir; | |
1556 | unsigned int notes; | |
1557 | struct bin_attribute attrs[0]; | |
1558 | }; | |
1559 | ||
2c3c8bea | 1560 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1561 | struct bin_attribute *bin_attr, |
1562 | char *buf, loff_t pos, size_t count) | |
1563 | { | |
1564 | /* | |
1565 | * The caller checked the pos and count against our size. | |
1566 | */ | |
1567 | memcpy(buf, bin_attr->private + pos, count); | |
1568 | return count; | |
1569 | } | |
1570 | ||
1571 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1572 | unsigned int i) | |
1573 | { | |
1574 | if (notes_attrs->dir) { | |
1575 | while (i-- > 0) | |
1576 | sysfs_remove_bin_file(notes_attrs->dir, | |
1577 | ¬es_attrs->attrs[i]); | |
e9432093 | 1578 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1579 | } |
1580 | kfree(notes_attrs); | |
1581 | } | |
1582 | ||
8f6d0378 | 1583 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1584 | { |
1585 | unsigned int notes, loaded, i; | |
1586 | struct module_notes_attrs *notes_attrs; | |
1587 | struct bin_attribute *nattr; | |
1588 | ||
ea6bff36 IM |
1589 | /* failed to create section attributes, so can't create notes */ |
1590 | if (!mod->sect_attrs) | |
1591 | return; | |
1592 | ||
6d760133 RM |
1593 | /* Count notes sections and allocate structures. */ |
1594 | notes = 0; | |
8f6d0378 RR |
1595 | for (i = 0; i < info->hdr->e_shnum; i++) |
1596 | if (!sect_empty(&info->sechdrs[i]) && | |
1597 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1598 | ++notes; |
1599 | ||
1600 | if (notes == 0) | |
1601 | return; | |
1602 | ||
acafe7e3 | 1603 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1604 | GFP_KERNEL); |
1605 | if (notes_attrs == NULL) | |
1606 | return; | |
1607 | ||
1608 | notes_attrs->notes = notes; | |
1609 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1610 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1611 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1612 | continue; |
8f6d0378 | 1613 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1614 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1615 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1616 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1617 | nattr->size = info->sechdrs[i].sh_size; |
1618 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1619 | nattr->read = module_notes_read; |
1620 | ++nattr; | |
1621 | } | |
1622 | ++loaded; | |
1623 | } | |
1624 | ||
4ff6abff | 1625 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1626 | if (!notes_attrs->dir) |
1627 | goto out; | |
1628 | ||
1629 | for (i = 0; i < notes; ++i) | |
1630 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1631 | ¬es_attrs->attrs[i])) | |
1632 | goto out; | |
1633 | ||
1634 | mod->notes_attrs = notes_attrs; | |
1635 | return; | |
1636 | ||
1637 | out: | |
1638 | free_notes_attrs(notes_attrs, i); | |
1639 | } | |
1640 | ||
1641 | static void remove_notes_attrs(struct module *mod) | |
1642 | { | |
1643 | if (mod->notes_attrs) | |
1644 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1645 | } | |
1646 | ||
1da177e4 | 1647 | #else |
04b1db9f | 1648 | |
8f6d0378 RR |
1649 | static inline void add_sect_attrs(struct module *mod, |
1650 | const struct load_info *info) | |
1da177e4 LT |
1651 | { |
1652 | } | |
1653 | ||
1654 | static inline void remove_sect_attrs(struct module *mod) | |
1655 | { | |
1656 | } | |
6d760133 | 1657 | |
8f6d0378 RR |
1658 | static inline void add_notes_attrs(struct module *mod, |
1659 | const struct load_info *info) | |
6d760133 RM |
1660 | { |
1661 | } | |
1662 | ||
1663 | static inline void remove_notes_attrs(struct module *mod) | |
1664 | { | |
1665 | } | |
8f6d0378 | 1666 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1667 | |
1ba5c08b | 1668 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1669 | { |
1670 | #ifdef CONFIG_MODULE_UNLOAD | |
1671 | struct module_use *use; | |
80a3d1bb | 1672 | |
75676500 | 1673 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1674 | list_for_each_entry(use, &mod->target_list, target_list) |
1675 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1676 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1677 | #endif |
1678 | } | |
1679 | ||
1ba5c08b | 1680 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1681 | { |
1ba5c08b | 1682 | int ret = 0; |
80a3d1bb RR |
1683 | #ifdef CONFIG_MODULE_UNLOAD |
1684 | struct module_use *use; | |
1685 | ||
75676500 | 1686 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1687 | list_for_each_entry(use, &mod->target_list, target_list) { |
1688 | ret = sysfs_create_link(use->target->holders_dir, | |
1689 | &mod->mkobj.kobj, mod->name); | |
1690 | if (ret) | |
1691 | break; | |
1692 | } | |
75676500 | 1693 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1694 | if (ret) |
1695 | del_usage_links(mod); | |
80a3d1bb | 1696 | #endif |
1ba5c08b | 1697 | return ret; |
80a3d1bb RR |
1698 | } |
1699 | ||
6407ebb2 | 1700 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1701 | { |
1702 | struct module_attribute *attr; | |
03e88ae1 | 1703 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1704 | int error = 0; |
1705 | int i; | |
1706 | ||
03e88ae1 GKH |
1707 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1708 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1709 | GFP_KERNEL); | |
1710 | if (!mod->modinfo_attrs) | |
1711 | return -ENOMEM; | |
1712 | ||
1713 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 | 1714 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
c75b590d | 1715 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1716 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1717 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1718 | error = sysfs_create_file(&mod->mkobj.kobj, |
1719 | &temp_attr->attr); | |
03e88ae1 GKH |
1720 | ++temp_attr; |
1721 | } | |
c988d2b2 MD |
1722 | } |
1723 | return error; | |
1724 | } | |
1725 | ||
6407ebb2 | 1726 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1727 | { |
1728 | struct module_attribute *attr; | |
1729 | int i; | |
1730 | ||
03e88ae1 GKH |
1731 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1732 | /* pick a field to test for end of list */ | |
1733 | if (!attr->attr.name) | |
1734 | break; | |
6da0b565 | 1735 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1736 | if (attr->free) |
1737 | attr->free(mod); | |
c988d2b2 | 1738 | } |
03e88ae1 | 1739 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1740 | } |
1da177e4 | 1741 | |
942e4431 LZ |
1742 | static void mod_kobject_put(struct module *mod) |
1743 | { | |
1744 | DECLARE_COMPLETION_ONSTACK(c); | |
1745 | mod->mkobj.kobj_completion = &c; | |
1746 | kobject_put(&mod->mkobj.kobj); | |
1747 | wait_for_completion(&c); | |
1748 | } | |
1749 | ||
6407ebb2 | 1750 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1751 | { |
1752 | int err; | |
6494a93d | 1753 | struct kobject *kobj; |
1da177e4 | 1754 | |
823bccfc | 1755 | if (!module_sysfs_initialized) { |
bddb12b3 | 1756 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1757 | err = -EINVAL; |
1758 | goto out; | |
1759 | } | |
6494a93d GKH |
1760 | |
1761 | kobj = kset_find_obj(module_kset, mod->name); | |
1762 | if (kobj) { | |
bddb12b3 | 1763 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1764 | kobject_put(kobj); |
1765 | err = -EINVAL; | |
1766 | goto out; | |
1767 | } | |
1768 | ||
1da177e4 | 1769 | mod->mkobj.mod = mod; |
e17e0f51 | 1770 | |
ac3c8141 GKH |
1771 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1772 | mod->mkobj.kobj.kset = module_kset; | |
1773 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1774 | "%s", mod->name); | |
1775 | if (err) | |
942e4431 | 1776 | mod_kobject_put(mod); |
270a6c4c | 1777 | |
97c146ef | 1778 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1779 | out: |
1780 | return err; | |
1781 | } | |
1782 | ||
6407ebb2 | 1783 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1784 | const struct load_info *info, |
270a6c4c KS |
1785 | struct kernel_param *kparam, |
1786 | unsigned int num_params) | |
1787 | { | |
1788 | int err; | |
1789 | ||
80a3d1bb RR |
1790 | err = mod_sysfs_init(mod); |
1791 | if (err) | |
1792 | goto out; | |
1793 | ||
4ff6abff | 1794 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1795 | if (!mod->holders_dir) { |
1796 | err = -ENOMEM; | |
270a6c4c | 1797 | goto out_unreg; |
240936e1 | 1798 | } |
270a6c4c | 1799 | |
1da177e4 LT |
1800 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1801 | if (err) | |
270a6c4c | 1802 | goto out_unreg_holders; |
1da177e4 | 1803 | |
c988d2b2 MD |
1804 | err = module_add_modinfo_attrs(mod); |
1805 | if (err) | |
e17e0f51 | 1806 | goto out_unreg_param; |
c988d2b2 | 1807 | |
1ba5c08b CL |
1808 | err = add_usage_links(mod); |
1809 | if (err) | |
1810 | goto out_unreg_modinfo_attrs; | |
1811 | ||
8f6d0378 RR |
1812 | add_sect_attrs(mod, info); |
1813 | add_notes_attrs(mod, info); | |
80a3d1bb | 1814 | |
e17e0f51 | 1815 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1816 | return 0; |
1817 | ||
1ba5c08b CL |
1818 | out_unreg_modinfo_attrs: |
1819 | module_remove_modinfo_attrs(mod); | |
e17e0f51 KS |
1820 | out_unreg_param: |
1821 | module_param_sysfs_remove(mod); | |
270a6c4c | 1822 | out_unreg_holders: |
78a2d906 | 1823 | kobject_put(mod->holders_dir); |
270a6c4c | 1824 | out_unreg: |
942e4431 | 1825 | mod_kobject_put(mod); |
80a3d1bb | 1826 | out: |
1da177e4 LT |
1827 | return err; |
1828 | } | |
34e4e2fe DL |
1829 | |
1830 | static void mod_sysfs_fini(struct module *mod) | |
1831 | { | |
8f6d0378 RR |
1832 | remove_notes_attrs(mod); |
1833 | remove_sect_attrs(mod); | |
942e4431 | 1834 | mod_kobject_put(mod); |
34e4e2fe DL |
1835 | } |
1836 | ||
cf2fde7b RR |
1837 | static void init_param_lock(struct module *mod) |
1838 | { | |
1839 | mutex_init(&mod->param_lock); | |
1840 | } | |
8f6d0378 | 1841 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1842 | |
8f6d0378 RR |
1843 | static int mod_sysfs_setup(struct module *mod, |
1844 | const struct load_info *info, | |
6407ebb2 RR |
1845 | struct kernel_param *kparam, |
1846 | unsigned int num_params) | |
1847 | { | |
1848 | return 0; | |
1849 | } | |
1850 | ||
34e4e2fe DL |
1851 | static void mod_sysfs_fini(struct module *mod) |
1852 | { | |
1853 | } | |
1854 | ||
36b0360d RR |
1855 | static void module_remove_modinfo_attrs(struct module *mod) |
1856 | { | |
1857 | } | |
1858 | ||
80a3d1bb RR |
1859 | static void del_usage_links(struct module *mod) |
1860 | { | |
1861 | } | |
1862 | ||
cf2fde7b RR |
1863 | static void init_param_lock(struct module *mod) |
1864 | { | |
1865 | } | |
34e4e2fe | 1866 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1867 | |
36b0360d | 1868 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1869 | { |
80a3d1bb | 1870 | del_usage_links(mod); |
c988d2b2 | 1871 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1872 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1873 | kobject_put(mod->mkobj.drivers_dir); |
1874 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1875 | mod_sysfs_fini(mod); |
1da177e4 LT |
1876 | } |
1877 | ||
0f5bf6d0 | 1878 | #ifdef CONFIG_STRICT_MODULE_RWX |
84e1c6bb MC |
1879 | /* |
1880 | * LKM RO/NX protection: protect module's text/ro-data | |
1881 | * from modification and any data from execution. | |
85c898db RR |
1882 | * |
1883 | * General layout of module is: | |
444d13ff JY |
1884 | * [text] [read-only-data] [ro-after-init] [writable data] |
1885 | * text_size -----^ ^ ^ ^ | |
1886 | * ro_size ------------------------| | | | |
1887 | * ro_after_init_size -----------------------------| | | |
1888 | * size -----------------------------------------------------------| | |
85c898db RR |
1889 | * |
1890 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1891 | */ |
85c898db RR |
1892 | static void frob_text(const struct module_layout *layout, |
1893 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1894 | { |
85c898db RR |
1895 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1896 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1897 | set_memory((unsigned long)layout->base, | |
1898 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1899 | } |
84e1c6bb | 1900 | |
85c898db RR |
1901 | static void frob_rodata(const struct module_layout *layout, |
1902 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1903 | { |
85c898db RR |
1904 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1905 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1906 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1907 | set_memory((unsigned long)layout->base + layout->text_size, | |
1908 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1909 | } |
1910 | ||
444d13ff JY |
1911 | static void frob_ro_after_init(const struct module_layout *layout, |
1912 | int (*set_memory)(unsigned long start, int num_pages)) | |
1913 | { | |
1914 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1915 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1916 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1917 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1918 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1919 | } | |
1920 | ||
85c898db RR |
1921 | static void frob_writable_data(const struct module_layout *layout, |
1922 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1923 | { |
85c898db | 1924 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1925 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1926 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1927 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1928 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1929 | } |
84e1c6bb | 1930 | |
85c898db RR |
1931 | /* livepatching wants to disable read-only so it can frob module. */ |
1932 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1933 | { |
39290b38 AT |
1934 | if (!rodata_enabled) |
1935 | return; | |
1936 | ||
85c898db RR |
1937 | frob_text(&mod->core_layout, set_memory_rw); |
1938 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 1939 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
1940 | frob_text(&mod->init_layout, set_memory_rw); |
1941 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1942 | } |
84e1c6bb | 1943 | |
444d13ff | 1944 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 1945 | { |
39290b38 AT |
1946 | if (!rodata_enabled) |
1947 | return; | |
1948 | ||
1a7b7d92 RE |
1949 | set_vm_flush_reset_perms(mod->core_layout.base); |
1950 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 1951 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 NA |
1952 | frob_text(&mod->core_layout, set_memory_x); |
1953 | ||
85c898db | 1954 | frob_rodata(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 1955 | |
85c898db | 1956 | frob_text(&mod->init_layout, set_memory_ro); |
f2c65fb3 NA |
1957 | frob_text(&mod->init_layout, set_memory_x); |
1958 | ||
85c898db | 1959 | frob_rodata(&mod->init_layout, set_memory_ro); |
444d13ff JY |
1960 | |
1961 | if (after_init) | |
1962 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
1963 | } |
1964 | ||
85c898db | 1965 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 1966 | { |
85c898db | 1967 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 1968 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
1969 | frob_writable_data(&mod->core_layout, set_memory_nx); |
1970 | frob_rodata(&mod->init_layout, set_memory_nx); | |
1971 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
1972 | } |
1973 | ||
84e1c6bb | 1974 | /* Iterate through all modules and set each module's text as RW */ |
5d05c708 | 1975 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
1976 | { |
1977 | struct module *mod; | |
1978 | ||
39290b38 AT |
1979 | if (!rodata_enabled) |
1980 | return; | |
1981 | ||
84e1c6bb MC |
1982 | mutex_lock(&module_mutex); |
1983 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1984 | if (mod->state == MODULE_STATE_UNFORMED) |
1985 | continue; | |
85c898db RR |
1986 | |
1987 | frob_text(&mod->core_layout, set_memory_rw); | |
1988 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb MC |
1989 | } |
1990 | mutex_unlock(&module_mutex); | |
1991 | } | |
1992 | ||
1993 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1994 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
1995 | { |
1996 | struct module *mod; | |
1997 | ||
39290b38 AT |
1998 | if (!rodata_enabled) |
1999 | return; | |
2000 | ||
84e1c6bb MC |
2001 | mutex_lock(&module_mutex); |
2002 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
2003 | /* |
2004 | * Ignore going modules since it's possible that ro | |
2005 | * protection has already been disabled, otherwise we'll | |
2006 | * run into protection faults at module deallocation. | |
2007 | */ | |
2008 | if (mod->state == MODULE_STATE_UNFORMED || | |
2009 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 2010 | continue; |
85c898db RR |
2011 | |
2012 | frob_text(&mod->core_layout, set_memory_ro); | |
2013 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb MC |
2014 | } |
2015 | mutex_unlock(&module_mutex); | |
2016 | } | |
2017 | #else | |
85c898db | 2018 | static void module_enable_nx(const struct module *mod) { } |
84e1c6bb MC |
2019 | #endif |
2020 | ||
1ce15ef4 JY |
2021 | #ifdef CONFIG_LIVEPATCH |
2022 | /* | |
2023 | * Persist Elf information about a module. Copy the Elf header, | |
2024 | * section header table, section string table, and symtab section | |
2025 | * index from info to mod->klp_info. | |
2026 | */ | |
2027 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2028 | { | |
2029 | unsigned int size, symndx; | |
2030 | int ret; | |
2031 | ||
2032 | size = sizeof(*mod->klp_info); | |
2033 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2034 | if (mod->klp_info == NULL) | |
2035 | return -ENOMEM; | |
2036 | ||
2037 | /* Elf header */ | |
2038 | size = sizeof(mod->klp_info->hdr); | |
2039 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2040 | ||
2041 | /* Elf section header table */ | |
2042 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2043 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2044 | if (mod->klp_info->sechdrs == NULL) { |
2045 | ret = -ENOMEM; | |
2046 | goto free_info; | |
2047 | } | |
1ce15ef4 JY |
2048 | |
2049 | /* Elf section name string table */ | |
2050 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2051 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2052 | if (mod->klp_info->secstrings == NULL) { |
2053 | ret = -ENOMEM; | |
2054 | goto free_sechdrs; | |
2055 | } | |
1ce15ef4 JY |
2056 | |
2057 | /* Elf symbol section index */ | |
2058 | symndx = info->index.sym; | |
2059 | mod->klp_info->symndx = symndx; | |
2060 | ||
2061 | /* | |
2062 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2063 | * copy of the original symbol table. Adjust sh_addr to point | |
2064 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2065 | * init memory is freed at the end of do_init_module(). | |
2066 | */ | |
2067 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2068 | (unsigned long) mod->core_kallsyms.symtab; | |
2069 | ||
2070 | return 0; | |
2071 | ||
2072 | free_sechdrs: | |
2073 | kfree(mod->klp_info->sechdrs); | |
2074 | free_info: | |
2075 | kfree(mod->klp_info); | |
2076 | return ret; | |
2077 | } | |
2078 | ||
2079 | static void free_module_elf(struct module *mod) | |
2080 | { | |
2081 | kfree(mod->klp_info->sechdrs); | |
2082 | kfree(mod->klp_info->secstrings); | |
2083 | kfree(mod->klp_info); | |
2084 | } | |
2085 | #else /* !CONFIG_LIVEPATCH */ | |
2086 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2087 | { | |
2088 | return 0; | |
2089 | } | |
2090 | ||
2091 | static void free_module_elf(struct module *mod) | |
2092 | { | |
2093 | } | |
2094 | #endif /* CONFIG_LIVEPATCH */ | |
2095 | ||
be1f221c | 2096 | void __weak module_memfree(void *module_region) |
74e08fcf | 2097 | { |
1a7b7d92 RE |
2098 | /* |
2099 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2100 | * supported by vmalloc. | |
2101 | */ | |
2102 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2103 | vfree(module_region); |
2104 | } | |
2105 | ||
2106 | void __weak module_arch_cleanup(struct module *mod) | |
2107 | { | |
2108 | } | |
2109 | ||
d453cded RR |
2110 | void __weak module_arch_freeing_init(struct module *mod) |
2111 | { | |
2112 | } | |
2113 | ||
75676500 | 2114 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2115 | static void free_module(struct module *mod) |
2116 | { | |
7ead8b83 LZ |
2117 | trace_module_free(mod); |
2118 | ||
36b0360d | 2119 | mod_sysfs_teardown(mod); |
1da177e4 | 2120 | |
944a1fa0 RR |
2121 | /* We leave it in list to prevent duplicate loads, but make sure |
2122 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2123 | mutex_lock(&module_mutex); |
944a1fa0 | 2124 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2125 | mutex_unlock(&module_mutex); |
944a1fa0 | 2126 | |
b82bab4b JB |
2127 | /* Remove dynamic debug info */ |
2128 | ddebug_remove_module(mod->name); | |
2129 | ||
1da177e4 LT |
2130 | /* Arch-specific cleanup. */ |
2131 | module_arch_cleanup(mod); | |
2132 | ||
2133 | /* Module unload stuff */ | |
2134 | module_unload_free(mod); | |
2135 | ||
e180a6b7 RR |
2136 | /* Free any allocated parameters. */ |
2137 | destroy_params(mod->kp, mod->num_kp); | |
2138 | ||
1ce15ef4 JY |
2139 | if (is_livepatch_module(mod)) |
2140 | free_module_elf(mod); | |
2141 | ||
944a1fa0 RR |
2142 | /* Now we can delete it from the lists */ |
2143 | mutex_lock(&module_mutex); | |
461e34ae MH |
2144 | /* Unlink carefully: kallsyms could be walking list. */ |
2145 | list_del_rcu(&mod->list); | |
93c2e105 | 2146 | mod_tree_remove(mod); |
0286b5ea | 2147 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2148 | module_bug_cleanup(mod); |
0be964be | 2149 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2150 | synchronize_rcu(); |
944a1fa0 RR |
2151 | mutex_unlock(&module_mutex); |
2152 | ||
85c898db | 2153 | /* This may be empty, but that's OK */ |
d453cded | 2154 | module_arch_freeing_init(mod); |
7523e4dc | 2155 | module_memfree(mod->init_layout.base); |
1da177e4 | 2156 | kfree(mod->args); |
259354de | 2157 | percpu_modfree(mod); |
9f85a4bb | 2158 | |
35a9393c | 2159 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2160 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2161 | |
1da177e4 | 2162 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2163 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2164 | } |
2165 | ||
2166 | void *__symbol_get(const char *symbol) | |
2167 | { | |
2168 | struct module *owner; | |
414fd31b | 2169 | const struct kernel_symbol *sym; |
1da177e4 | 2170 | |
24da1cbf | 2171 | preempt_disable(); |
414fd31b TA |
2172 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2173 | if (sym && strong_try_module_get(owner)) | |
2174 | sym = NULL; | |
24da1cbf | 2175 | preempt_enable(); |
1da177e4 | 2176 | |
7290d580 | 2177 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2178 | } |
2179 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2180 | ||
eea8b54d AN |
2181 | /* |
2182 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2183 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2184 | * |
2185 | * You must hold the module_mutex. | |
eea8b54d | 2186 | */ |
2d25bc55 | 2187 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2188 | { |
b211104d | 2189 | unsigned int i; |
eea8b54d | 2190 | struct module *owner; |
b211104d RR |
2191 | const struct kernel_symbol *s; |
2192 | struct { | |
2193 | const struct kernel_symbol *sym; | |
2194 | unsigned int num; | |
2195 | } arr[] = { | |
2196 | { mod->syms, mod->num_syms }, | |
2197 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2198 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2199 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2200 | { mod->unused_syms, mod->num_unused_syms }, |
2201 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2202 | #endif |
b211104d | 2203 | }; |
eea8b54d | 2204 | |
b211104d RR |
2205 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2206 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 AB |
2207 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
2208 | true, false)) { | |
bddb12b3 | 2209 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2210 | " (owned by %s)\n", |
7290d580 AB |
2211 | mod->name, kernel_symbol_name(s), |
2212 | module_name(owner)); | |
b211104d RR |
2213 | return -ENOEXEC; |
2214 | } | |
eea8b54d | 2215 | } |
b211104d RR |
2216 | } |
2217 | return 0; | |
eea8b54d AN |
2218 | } |
2219 | ||
9a4b9708 | 2220 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2221 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2222 | { | |
2223 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2224 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2225 | unsigned long secbase; |
49668688 | 2226 | unsigned int i; |
1da177e4 | 2227 | int ret = 0; |
414fd31b | 2228 | const struct kernel_symbol *ksym; |
1da177e4 | 2229 | |
49668688 RR |
2230 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2231 | const char *name = info->strtab + sym[i].st_name; | |
2232 | ||
1da177e4 LT |
2233 | switch (sym[i].st_shndx) { |
2234 | case SHN_COMMON: | |
80375980 JM |
2235 | /* Ignore common symbols */ |
2236 | if (!strncmp(name, "__gnu_lto", 9)) | |
2237 | break; | |
2238 | ||
1da177e4 LT |
2239 | /* We compiled with -fno-common. These are not |
2240 | supposed to happen. */ | |
5e124169 | 2241 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2242 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2243 | mod->name); |
2244 | ret = -ENOEXEC; | |
2245 | break; | |
2246 | ||
2247 | case SHN_ABS: | |
2248 | /* Don't need to do anything */ | |
5e124169 | 2249 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2250 | (long)sym[i].st_value); |
2251 | break; | |
2252 | ||
1ce15ef4 JY |
2253 | case SHN_LIVEPATCH: |
2254 | /* Livepatch symbols are resolved by livepatch */ | |
2255 | break; | |
2256 | ||
1da177e4 | 2257 | case SHN_UNDEF: |
49668688 | 2258 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2259 | /* Ok if resolved. */ |
9bea7f23 | 2260 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2261 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2262 | break; |
414fd31b TA |
2263 | } |
2264 | ||
1da177e4 | 2265 | /* Ok if weak. */ |
9bea7f23 | 2266 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2267 | break; |
2268 | ||
9bea7f23 | 2269 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2270 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2271 | mod->name, name, ret); | |
1da177e4 LT |
2272 | break; |
2273 | ||
2274 | default: | |
2275 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2276 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2277 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2278 | else |
49668688 | 2279 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2280 | sym[i].st_value += secbase; |
2281 | break; | |
2282 | } | |
2283 | } | |
2284 | ||
2285 | return ret; | |
2286 | } | |
2287 | ||
49668688 | 2288 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2289 | { |
2290 | unsigned int i; | |
2291 | int err = 0; | |
2292 | ||
2293 | /* Now do relocations. */ | |
49668688 RR |
2294 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2295 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2296 | |
2297 | /* Not a valid relocation section? */ | |
49668688 | 2298 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2299 | continue; |
2300 | ||
2301 | /* Don't bother with non-allocated sections */ | |
49668688 | 2302 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2303 | continue; |
2304 | ||
1ce15ef4 JY |
2305 | /* Livepatch relocation sections are applied by livepatch */ |
2306 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2307 | continue; | |
2308 | ||
49668688 RR |
2309 | if (info->sechdrs[i].sh_type == SHT_REL) |
2310 | err = apply_relocate(info->sechdrs, info->strtab, | |
2311 | info->index.sym, i, mod); | |
2312 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2313 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2314 | info->index.sym, i, mod); | |
22e268eb RR |
2315 | if (err < 0) |
2316 | break; | |
2317 | } | |
2318 | return err; | |
2319 | } | |
2320 | ||
088af9a6 HD |
2321 | /* Additional bytes needed by arch in front of individual sections */ |
2322 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2323 | unsigned int section) | |
2324 | { | |
2325 | /* default implementation just returns zero */ | |
2326 | return 0; | |
2327 | } | |
2328 | ||
1da177e4 | 2329 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2330 | static long get_offset(struct module *mod, unsigned int *size, |
2331 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2332 | { |
2333 | long ret; | |
2334 | ||
088af9a6 | 2335 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2336 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2337 | *size = ret + sechdr->sh_size; | |
2338 | return ret; | |
2339 | } | |
2340 | ||
2341 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2342 | might -- code, read-only data, read-write data, small data. Tally | |
2343 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2344 | belongs in init. */ | |
49668688 | 2345 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2346 | { |
2347 | static unsigned long const masks[][2] = { | |
2348 | /* NOTE: all executable code must be the first section | |
2349 | * in this array; otherwise modify the text_size | |
2350 | * finder in the two loops below */ | |
2351 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2352 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2353 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2354 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2355 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2356 | }; | |
2357 | unsigned int m, i; | |
2358 | ||
49668688 RR |
2359 | for (i = 0; i < info->hdr->e_shnum; i++) |
2360 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2361 | |
5e124169 | 2362 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2363 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2364 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2365 | Elf_Shdr *s = &info->sechdrs[i]; | |
2366 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2367 | |
2368 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2369 | || (s->sh_flags & masks[m][1]) | |
2370 | || s->sh_entsize != ~0UL | |
49668688 | 2371 | || strstarts(sname, ".init")) |
1da177e4 | 2372 | continue; |
7523e4dc | 2373 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2374 | pr_debug("\t%s\n", sname); |
1da177e4 | 2375 | } |
84e1c6bb MC |
2376 | switch (m) { |
2377 | case 0: /* executable */ | |
7523e4dc RR |
2378 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2379 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2380 | break; |
2381 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2382 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2383 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2384 | break; |
444d13ff JY |
2385 | case 2: /* RO after init */ |
2386 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2387 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2388 | break; | |
2389 | case 4: /* whole core */ | |
7523e4dc | 2390 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2391 | break; |
2392 | } | |
1da177e4 LT |
2393 | } |
2394 | ||
5e124169 | 2395 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2396 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2397 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2398 | Elf_Shdr *s = &info->sechdrs[i]; | |
2399 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2400 | |
2401 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2402 | || (s->sh_flags & masks[m][1]) | |
2403 | || s->sh_entsize != ~0UL | |
49668688 | 2404 | || !strstarts(sname, ".init")) |
1da177e4 | 2405 | continue; |
7523e4dc | 2406 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2407 | | INIT_OFFSET_MASK); |
5e124169 | 2408 | pr_debug("\t%s\n", sname); |
1da177e4 | 2409 | } |
84e1c6bb MC |
2410 | switch (m) { |
2411 | case 0: /* executable */ | |
7523e4dc RR |
2412 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2413 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2414 | break; |
2415 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2416 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2417 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2418 | break; |
444d13ff JY |
2419 | case 2: |
2420 | /* | |
2421 | * RO after init doesn't apply to init_layout (only | |
2422 | * core_layout), so it just takes the value of ro_size. | |
2423 | */ | |
2424 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2425 | break; | |
2426 | case 4: /* whole init */ | |
7523e4dc | 2427 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2428 | break; |
2429 | } | |
1da177e4 LT |
2430 | } |
2431 | } | |
2432 | ||
1da177e4 LT |
2433 | static void set_license(struct module *mod, const char *license) |
2434 | { | |
2435 | if (!license) | |
2436 | license = "unspecified"; | |
2437 | ||
fa3ba2e8 | 2438 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2439 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2440 | pr_warn("%s: module license '%s' taints kernel.\n", |
2441 | mod->name, license); | |
373d4d09 RR |
2442 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2443 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2444 | } |
2445 | } | |
2446 | ||
2447 | /* Parse tag=value strings from .modinfo section */ | |
2448 | static char *next_string(char *string, unsigned long *secsize) | |
2449 | { | |
2450 | /* Skip non-zero chars */ | |
2451 | while (string[0]) { | |
2452 | string++; | |
2453 | if ((*secsize)-- <= 1) | |
2454 | return NULL; | |
2455 | } | |
2456 | ||
2457 | /* Skip any zero padding. */ | |
2458 | while (!string[0]) { | |
2459 | string++; | |
2460 | if ((*secsize)-- <= 1) | |
2461 | return NULL; | |
2462 | } | |
2463 | return string; | |
2464 | } | |
2465 | ||
49668688 | 2466 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2467 | { |
2468 | char *p; | |
2469 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2470 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2471 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2472 | |
5fdc7db6 JY |
2473 | /* |
2474 | * get_modinfo() calls made before rewrite_section_headers() | |
2475 | * must use sh_offset, as sh_addr isn't set! | |
2476 | */ | |
2477 | for (p = (char *)info->hdr + infosec->sh_offset; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2478 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2479 | return p + taglen + 1; | |
2480 | } | |
2481 | return NULL; | |
2482 | } | |
2483 | ||
49668688 | 2484 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2485 | { |
2486 | struct module_attribute *attr; | |
2487 | int i; | |
2488 | ||
2489 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2490 | if (attr->setup) | |
49668688 | 2491 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2492 | } |
2493 | } | |
c988d2b2 | 2494 | |
a263f776 RR |
2495 | static void free_modinfo(struct module *mod) |
2496 | { | |
2497 | struct module_attribute *attr; | |
2498 | int i; | |
2499 | ||
2500 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2501 | if (attr->free) | |
2502 | attr->free(mod); | |
2503 | } | |
2504 | } | |
2505 | ||
1da177e4 | 2506 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2507 | |
2d25bc55 JY |
2508 | /* Lookup exported symbol in given range of kernel_symbols */ |
2509 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2510 | const struct kernel_symbol *start, | |
2511 | const struct kernel_symbol *stop) | |
15bba37d | 2512 | { |
9d63487f AIB |
2513 | return bsearch(name, start, stop - start, |
2514 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2515 | } |
2516 | ||
ca4787b7 TA |
2517 | static int is_exported(const char *name, unsigned long value, |
2518 | const struct module *mod) | |
1da177e4 | 2519 | { |
ca4787b7 TA |
2520 | const struct kernel_symbol *ks; |
2521 | if (!mod) | |
2d25bc55 | 2522 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2523 | else |
2d25bc55 JY |
2524 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2525 | ||
7290d580 | 2526 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2527 | } |
2528 | ||
2529 | /* As per nm */ | |
eded41c1 | 2530 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2531 | { |
eded41c1 RR |
2532 | const Elf_Shdr *sechdrs = info->sechdrs; |
2533 | ||
1da177e4 LT |
2534 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2535 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2536 | return 'v'; | |
2537 | else | |
2538 | return 'w'; | |
2539 | } | |
2540 | if (sym->st_shndx == SHN_UNDEF) | |
2541 | return 'U'; | |
e0224418 | 2542 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2543 | return 'a'; |
2544 | if (sym->st_shndx >= SHN_LORESERVE) | |
2545 | return '?'; | |
2546 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2547 | return 't'; | |
2548 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2549 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2550 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2551 | return 'r'; | |
2552 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2553 | return 'g'; | |
2554 | else | |
2555 | return 'd'; | |
2556 | } | |
2557 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2558 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2559 | return 's'; | |
2560 | else | |
2561 | return 'b'; | |
2562 | } | |
eded41c1 RR |
2563 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2564 | ".debug")) { | |
1da177e4 | 2565 | return 'n'; |
eded41c1 | 2566 | } |
1da177e4 LT |
2567 | return '?'; |
2568 | } | |
2569 | ||
4a496226 | 2570 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2571 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2572 | { |
2573 | const Elf_Shdr *sec; | |
2574 | ||
2575 | if (src->st_shndx == SHN_UNDEF | |
2576 | || src->st_shndx >= shnum | |
2577 | || !src->st_name) | |
2578 | return false; | |
2579 | ||
e0224418 MB |
2580 | #ifdef CONFIG_KALLSYMS_ALL |
2581 | if (src->st_shndx == pcpundx) | |
2582 | return true; | |
2583 | #endif | |
2584 | ||
4a496226 JB |
2585 | sec = sechdrs + src->st_shndx; |
2586 | if (!(sec->sh_flags & SHF_ALLOC) | |
2587 | #ifndef CONFIG_KALLSYMS_ALL | |
2588 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2589 | #endif | |
2590 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2591 | return false; | |
2592 | ||
2593 | return true; | |
2594 | } | |
2595 | ||
48fd1188 KC |
2596 | /* |
2597 | * We only allocate and copy the strings needed by the parts of symtab | |
2598 | * we keep. This is simple, but has the effect of making multiple | |
2599 | * copies of duplicates. We could be more sophisticated, see | |
2600 | * linux-kernel thread starting with | |
2601 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2602 | */ | |
49668688 | 2603 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2604 | { |
49668688 RR |
2605 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2606 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2607 | const Elf_Sym *src; |
54523ec7 | 2608 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2609 | |
2610 | /* Put symbol section at end of init part of module. */ | |
2611 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2612 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2613 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2614 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2615 | |
49668688 | 2616 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2617 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2618 | |
48fd1188 | 2619 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2620 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2621 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2622 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2623 | info->index.pcpu)) { | |
59ef28b1 | 2624 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2625 | ndst++; |
554bdfe5 | 2626 | } |
59ef28b1 | 2627 | } |
4a496226 JB |
2628 | |
2629 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2630 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2631 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2632 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2633 | info->core_typeoffs = mod->core_layout.size; |
2634 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2635 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2636 | |
554bdfe5 JB |
2637 | /* Put string table section at end of init part of module. */ |
2638 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2639 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2640 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2641 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2642 | |
2643 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2644 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2645 | __alignof__(struct mod_kallsyms)); | |
2646 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2647 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2648 | info->init_typeoffs = mod->init_layout.size; |
2649 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2650 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2651 | } |
2652 | ||
8244062e RR |
2653 | /* |
2654 | * We use the full symtab and strtab which layout_symtab arranged to | |
2655 | * be appended to the init section. Later we switch to the cut-down | |
2656 | * core-only ones. | |
2657 | */ | |
811d66a0 | 2658 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2659 | { |
4a496226 JB |
2660 | unsigned int i, ndst; |
2661 | const Elf_Sym *src; | |
2662 | Elf_Sym *dst; | |
554bdfe5 | 2663 | char *s; |
eded41c1 | 2664 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2665 | |
8244062e RR |
2666 | /* Set up to point into init section. */ |
2667 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2668 | ||
2669 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2670 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2671 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2672 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2673 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2674 | |
1c7651f4 EL |
2675 | /* |
2676 | * Now populate the cut down core kallsyms for after init | |
2677 | * and set types up while we still have access to sections. | |
2678 | */ | |
8244062e RR |
2679 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2680 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2681 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2682 | src = mod->kallsyms->symtab; |
2683 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2684 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2685 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2686 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2687 | info->index.pcpu)) { | |
1c7651f4 EL |
2688 | mod->core_kallsyms.typetab[ndst] = |
2689 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2690 | dst[ndst] = src[i]; |
8244062e RR |
2691 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2692 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2693 | KSYM_NAME_LEN) + 1; |
2694 | } | |
4a496226 | 2695 | } |
8244062e | 2696 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2697 | } |
2698 | #else | |
49668688 | 2699 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2700 | { |
2701 | } | |
3ae91c21 | 2702 | |
abbce906 | 2703 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2704 | { |
2705 | } | |
2706 | #endif /* CONFIG_KALLSYMS */ | |
2707 | ||
52796312 | 2708 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2709 | { |
811d66a0 RR |
2710 | if (!debug) |
2711 | return; | |
513770f5 | 2712 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2713 | } |
346e15be | 2714 | |
52796312 | 2715 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2716 | { |
2717 | if (debug) | |
52796312 | 2718 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2719 | } |
2720 | ||
74e08fcf JB |
2721 | void * __weak module_alloc(unsigned long size) |
2722 | { | |
82fab442 | 2723 | return vmalloc_exec(size); |
74e08fcf JB |
2724 | } |
2725 | ||
4f2294b6 | 2726 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2727 | static void kmemleak_load_module(const struct module *mod, |
2728 | const struct load_info *info) | |
4f2294b6 CM |
2729 | { |
2730 | unsigned int i; | |
2731 | ||
2732 | /* only scan the sections containing data */ | |
c017b4be | 2733 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2734 | |
49668688 | 2735 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2736 | /* Scan all writable sections that's not executable */ |
2737 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2738 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2739 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2740 | continue; |
2741 | ||
49668688 RR |
2742 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2743 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2744 | } |
2745 | } | |
2746 | #else | |
49668688 RR |
2747 | static inline void kmemleak_load_module(const struct module *mod, |
2748 | const struct load_info *info) | |
4f2294b6 CM |
2749 | { |
2750 | } | |
2751 | #endif | |
2752 | ||
106a4ee2 | 2753 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2754 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2755 | { |
2756 | int err = -ENOKEY; | |
34e1169d KC |
2757 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2758 | const void *mod = info->hdr; | |
caabe240 | 2759 | |
bca014ca BH |
2760 | /* |
2761 | * Require flags == 0, as a module with version information | |
2762 | * removed is no longer the module that was signed | |
2763 | */ | |
2764 | if (flags == 0 && | |
2765 | info->len > markerlen && | |
34e1169d | 2766 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2767 | /* We truncate the module to discard the signature */ |
34e1169d | 2768 | info->len -= markerlen; |
f314dfea | 2769 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2770 | } |
2771 | ||
2772 | if (!err) { | |
2773 | info->sig_ok = true; | |
2774 | return 0; | |
2775 | } | |
2776 | ||
2777 | /* Not having a signature is only an error if we're strict. */ | |
2c8fd268 | 2778 | if (err == -ENOKEY && !is_module_sig_enforced()) |
106a4ee2 RR |
2779 | err = 0; |
2780 | ||
2781 | return err; | |
2782 | } | |
2783 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2784 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2785 | { |
2786 | return 0; | |
2787 | } | |
2788 | #endif /* !CONFIG_MODULE_SIG */ | |
2789 | ||
34e1169d KC |
2790 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2791 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2792 | { |
34e1169d KC |
2793 | if (info->len < sizeof(*(info->hdr))) |
2794 | return -ENOEXEC; | |
2795 | ||
2796 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2797 | || info->hdr->e_type != ET_REL | |
2798 | || !elf_check_arch(info->hdr) | |
2799 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2800 | return -ENOEXEC; | |
2801 | ||
2802 | if (info->hdr->e_shoff >= info->len | |
2803 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2804 | info->len - info->hdr->e_shoff)) | |
2805 | return -ENOEXEC; | |
40dd2560 | 2806 | |
34e1169d KC |
2807 | return 0; |
2808 | } | |
2809 | ||
3afe9f84 LT |
2810 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2811 | ||
2812 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2813 | { | |
2814 | do { | |
2815 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2816 | ||
2817 | if (copy_from_user(dst, usrc, n) != 0) | |
2818 | return -EFAULT; | |
2819 | cond_resched(); | |
2820 | dst += n; | |
2821 | usrc += n; | |
2822 | len -= n; | |
2823 | } while (len); | |
2824 | return 0; | |
2825 | } | |
2826 | ||
1ce15ef4 | 2827 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2828 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2829 | { |
2992ef29 JP |
2830 | if (get_modinfo(info, "livepatch")) { |
2831 | mod->klp = true; | |
2832 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2833 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2834 | mod->name); | |
2992ef29 | 2835 | } |
1ce15ef4 JY |
2836 | |
2837 | return 0; | |
2838 | } | |
2839 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2840 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2841 | { |
2842 | if (get_modinfo(info, "livepatch")) { | |
2843 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2844 | mod->name); | |
2845 | return -ENOEXEC; | |
2846 | } | |
2847 | ||
2848 | return 0; | |
2849 | } | |
2850 | #endif /* CONFIG_LIVEPATCH */ | |
2851 | ||
caf7501a AK |
2852 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2853 | { | |
2854 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2855 | return; | |
2856 | ||
2857 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2858 | mod->name); | |
2859 | } | |
2860 | ||
34e1169d KC |
2861 | /* Sets info->hdr and info->len. */ |
2862 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2863 | struct load_info *info) | |
40dd2560 RR |
2864 | { |
2865 | int err; | |
40dd2560 | 2866 | |
34e1169d KC |
2867 | info->len = len; |
2868 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2869 | return -ENOEXEC; |
2870 | ||
c77b8cdf | 2871 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2872 | if (err) |
2873 | return err; | |
2874 | ||
40dd2560 | 2875 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2876 | info->hdr = __vmalloc(info->len, |
19809c2d | 2877 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2878 | if (!info->hdr) |
40dd2560 RR |
2879 | return -ENOMEM; |
2880 | ||
3afe9f84 | 2881 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2882 | vfree(info->hdr); |
2883 | return -EFAULT; | |
40dd2560 RR |
2884 | } |
2885 | ||
34e1169d KC |
2886 | return 0; |
2887 | } | |
2888 | ||
d913188c RR |
2889 | static void free_copy(struct load_info *info) |
2890 | { | |
d913188c RR |
2891 | vfree(info->hdr); |
2892 | } | |
2893 | ||
2f3238ae | 2894 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2895 | { |
2896 | unsigned int i; | |
2897 | ||
2898 | /* This should always be true, but let's be sure. */ | |
2899 | info->sechdrs[0].sh_addr = 0; | |
2900 | ||
2901 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2902 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2903 | if (shdr->sh_type != SHT_NOBITS | |
2904 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2905 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2906 | return -ENOEXEC; |
2907 | } | |
2908 | ||
2909 | /* Mark all sections sh_addr with their address in the | |
2910 | temporary image. */ | |
2911 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2912 | ||
2913 | #ifndef CONFIG_MODULE_UNLOAD | |
2914 | /* Don't load .exit sections */ | |
2915 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2916 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2917 | #endif | |
8b5f61a7 | 2918 | } |
d6df72a0 RR |
2919 | |
2920 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 2921 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 2922 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 2923 | |
8b5f61a7 RR |
2924 | return 0; |
2925 | } | |
2926 | ||
3264d3f9 LT |
2927 | /* |
2928 | * Set up our basic convenience variables (pointers to section headers, | |
2929 | * search for module section index etc), and do some basic section | |
2930 | * verification. | |
2931 | * | |
81a0abd9 JY |
2932 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
2933 | * will be allocated in move_module(). | |
3264d3f9 | 2934 | */ |
81a0abd9 | 2935 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2936 | { |
2937 | unsigned int i; | |
3264d3f9 LT |
2938 | |
2939 | /* Set up the convenience variables */ | |
2940 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2941 | info->secstrings = (void *)info->hdr |
2942 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2943 | |
5fdc7db6 JY |
2944 | /* Try to find a name early so we can log errors with a module name */ |
2945 | info->index.info = find_sec(info, ".modinfo"); | |
2946 | if (!info->index.info) | |
2947 | info->name = "(missing .modinfo section)"; | |
2948 | else | |
2949 | info->name = get_modinfo(info, "name"); | |
3264d3f9 | 2950 | |
8b5f61a7 RR |
2951 | /* Find internal symbols and strings. */ |
2952 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2953 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2954 | info->index.sym = i; | |
2955 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2956 | info->strtab = (char *)info->hdr |
2957 | + info->sechdrs[info->index.str].sh_offset; | |
2958 | break; | |
3264d3f9 | 2959 | } |
3264d3f9 LT |
2960 | } |
2961 | ||
5fdc7db6 JY |
2962 | if (info->index.sym == 0) { |
2963 | pr_warn("%s: module has no symbols (stripped?)\n", info->name); | |
2964 | return -ENOEXEC; | |
2965 | } | |
2966 | ||
49668688 | 2967 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2968 | if (!info->index.mod) { |
3e2e857f KC |
2969 | pr_warn("%s: No module found in object\n", |
2970 | info->name ?: "(missing .modinfo name field)"); | |
81a0abd9 | 2971 | return -ENOEXEC; |
3264d3f9 LT |
2972 | } |
2973 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 2974 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 2975 | |
3e2e857f | 2976 | /* |
5fdc7db6 | 2977 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
2978 | * on-disk struct mod 'name' field. |
2979 | */ | |
2980 | if (!info->name) | |
81a0abd9 | 2981 | info->name = info->mod->name; |
3e2e857f | 2982 | |
5fdc7db6 JY |
2983 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2984 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2985 | else | |
2986 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 2987 | |
49668688 | 2988 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2989 | |
81a0abd9 | 2990 | return 0; |
3264d3f9 LT |
2991 | } |
2992 | ||
2f3238ae | 2993 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2994 | { |
49668688 | 2995 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2996 | int err; |
2997 | ||
2f3238ae RR |
2998 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2999 | modmagic = NULL; | |
3000 | ||
40dd2560 RR |
3001 | /* This is allowed: modprobe --force will invalidate it. */ |
3002 | if (!modmagic) { | |
3003 | err = try_to_force_load(mod, "bad vermagic"); | |
3004 | if (err) | |
3005 | return err; | |
49668688 | 3006 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3007 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3008 | info->name, modmagic, vermagic); |
40dd2560 RR |
3009 | return -ENOEXEC; |
3010 | } | |
3011 | ||
3205c36c LP |
3012 | if (!get_modinfo(info, "intree")) { |
3013 | if (!test_taint(TAINT_OOT_MODULE)) | |
3014 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3015 | mod->name); | |
373d4d09 | 3016 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3017 | } |
2449b8ba | 3018 | |
caf7501a AK |
3019 | check_modinfo_retpoline(mod, info); |
3020 | ||
49668688 | 3021 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3022 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3023 | pr_warn("%s: module is from the staging directory, the quality " |
3024 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3025 | } |
22e268eb | 3026 | |
2992ef29 | 3027 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3028 | if (err) |
3029 | return err; | |
3030 | ||
22e268eb | 3031 | /* Set up license info based on the info section */ |
49668688 | 3032 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3033 | |
40dd2560 RR |
3034 | return 0; |
3035 | } | |
3036 | ||
eb3057df | 3037 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3038 | { |
49668688 | 3039 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3040 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3041 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3042 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3043 | mod->crcs = section_addr(info, "__kcrctab"); |
3044 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3045 | sizeof(*mod->gpl_syms), |
3046 | &mod->num_gpl_syms); | |
49668688 RR |
3047 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3048 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3049 | "__ksymtab_gpl_future", |
3050 | sizeof(*mod->gpl_future_syms), | |
3051 | &mod->num_gpl_future_syms); | |
49668688 | 3052 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3053 | |
3054 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3055 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3056 | sizeof(*mod->unused_syms), |
3057 | &mod->num_unused_syms); | |
49668688 RR |
3058 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3059 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3060 | sizeof(*mod->unused_gpl_syms), |
3061 | &mod->num_unused_gpl_syms); | |
49668688 | 3062 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3063 | #endif |
3064 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3065 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3066 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3067 | if (!mod->ctors) |
3068 | mod->ctors = section_objs(info, ".init_array", | |
3069 | sizeof(*mod->ctors), &mod->num_ctors); | |
3070 | else if (find_sec(info, ".init_array")) { | |
3071 | /* | |
3072 | * This shouldn't happen with same compiler and binutils | |
3073 | * building all parts of the module. | |
3074 | */ | |
6da0b565 | 3075 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3076 | mod->name); |
3077 | return -EINVAL; | |
3078 | } | |
f91a13bb LT |
3079 | #endif |
3080 | ||
3081 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3082 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3083 | sizeof(*mod->tracepoints_ptrs), | |
3084 | &mod->num_tracepoints); | |
f91a13bb | 3085 | #endif |
a38d1107 MM |
3086 | #ifdef CONFIG_BPF_EVENTS |
3087 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3088 | sizeof(*mod->bpf_raw_events), | |
3089 | &mod->num_bpf_raw_events); | |
3090 | #endif | |
e9666d10 | 3091 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3092 | mod->jump_entries = section_objs(info, "__jump_table", |
3093 | sizeof(*mod->jump_entries), | |
3094 | &mod->num_jump_entries); | |
3095 | #endif | |
f91a13bb | 3096 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3097 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3098 | sizeof(*mod->trace_events), |
3099 | &mod->num_trace_events); | |
99be647c JL |
3100 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3101 | sizeof(*mod->trace_evals), | |
3102 | &mod->num_trace_evals); | |
f91a13bb | 3103 | #endif |
13b9b6e7 SR |
3104 | #ifdef CONFIG_TRACING |
3105 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3106 | sizeof(*mod->trace_bprintk_fmt_start), | |
3107 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3108 | #endif |
f91a13bb LT |
3109 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3110 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3111 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3112 | sizeof(*mod->ftrace_callsites), |
3113 | &mod->num_ftrace_callsites); | |
3114 | #endif | |
540adea3 MH |
3115 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3116 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3117 | sizeof(*mod->ei_funcs), | |
3118 | &mod->num_ei_funcs); | |
92ace999 | 3119 | #endif |
811d66a0 RR |
3120 | mod->extable = section_objs(info, "__ex_table", |
3121 | sizeof(*mod->extable), &mod->num_exentries); | |
3122 | ||
49668688 | 3123 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3124 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3125 | |
3126 | info->debug = section_objs(info, "__verbose", | |
3127 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3128 | |
3129 | return 0; | |
f91a13bb LT |
3130 | } |
3131 | ||
49668688 | 3132 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3133 | { |
3134 | int i; | |
3135 | void *ptr; | |
3136 | ||
3137 | /* Do the allocs. */ | |
7523e4dc | 3138 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3139 | /* |
3140 | * The pointer to this block is stored in the module structure | |
3141 | * which is inside the block. Just mark it as not being a | |
3142 | * leak. | |
3143 | */ | |
3144 | kmemleak_not_leak(ptr); | |
3145 | if (!ptr) | |
d913188c | 3146 | return -ENOMEM; |
65b8a9b4 | 3147 | |
7523e4dc RR |
3148 | memset(ptr, 0, mod->core_layout.size); |
3149 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3150 | |
7523e4dc RR |
3151 | if (mod->init_layout.size) { |
3152 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3153 | /* |
3154 | * The pointer to this block is stored in the module structure | |
3155 | * which is inside the block. This block doesn't need to be | |
3156 | * scanned as it contains data and code that will be freed | |
3157 | * after the module is initialized. | |
3158 | */ | |
3159 | kmemleak_ignore(ptr); | |
3160 | if (!ptr) { | |
7523e4dc | 3161 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3162 | return -ENOMEM; |
3163 | } | |
7523e4dc RR |
3164 | memset(ptr, 0, mod->init_layout.size); |
3165 | mod->init_layout.base = ptr; | |
82fab442 | 3166 | } else |
7523e4dc | 3167 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3168 | |
3169 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3170 | pr_debug("final section addresses:\n"); |
49668688 | 3171 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3172 | void *dest; |
49668688 | 3173 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3174 | |
49668688 | 3175 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3176 | continue; |
3177 | ||
49668688 | 3178 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3179 | dest = mod->init_layout.base |
49668688 | 3180 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3181 | else |
7523e4dc | 3182 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3183 | |
49668688 RR |
3184 | if (shdr->sh_type != SHT_NOBITS) |
3185 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3186 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3187 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3188 | pr_debug("\t0x%lx %s\n", |
3189 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3190 | } |
d913188c RR |
3191 | |
3192 | return 0; | |
65b8a9b4 LT |
3193 | } |
3194 | ||
49668688 | 3195 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3196 | { |
3205c36c LP |
3197 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3198 | ||
22e268eb RR |
3199 | /* |
3200 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3201 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3202 | * using GPL-only symbols it needs. | |
3203 | */ | |
3204 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3205 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3206 | |
3207 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3208 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3209 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3210 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3211 | |
c99af375 MG |
3212 | /* lve claims to be GPL but upstream won't provide source */ |
3213 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3214 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3215 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3216 | |
3205c36c LP |
3217 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3218 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3219 | ||
22e268eb RR |
3220 | #ifdef CONFIG_MODVERSIONS |
3221 | if ((mod->num_syms && !mod->crcs) | |
3222 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3223 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3224 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3225 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3226 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3227 | #endif | |
3228 | ) { | |
3229 | return try_to_force_load(mod, | |
3230 | "no versions for exported symbols"); | |
3231 | } | |
3232 | #endif | |
3233 | return 0; | |
3234 | } | |
3235 | ||
3236 | static void flush_module_icache(const struct module *mod) | |
3237 | { | |
3238 | mm_segment_t old_fs; | |
3239 | ||
3240 | /* flush the icache in correct context */ | |
3241 | old_fs = get_fs(); | |
3242 | set_fs(KERNEL_DS); | |
3243 | ||
3244 | /* | |
3245 | * Flush the instruction cache, since we've played with text. | |
3246 | * Do it before processing of module parameters, so the module | |
3247 | * can provide parameter accessor functions of its own. | |
3248 | */ | |
7523e4dc RR |
3249 | if (mod->init_layout.base) |
3250 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3251 | (unsigned long)mod->init_layout.base | |
3252 | + mod->init_layout.size); | |
3253 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3254 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3255 | |
3256 | set_fs(old_fs); | |
3257 | } | |
3258 | ||
74e08fcf JB |
3259 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3260 | Elf_Shdr *sechdrs, | |
3261 | char *secstrings, | |
3262 | struct module *mod) | |
3263 | { | |
3264 | return 0; | |
3265 | } | |
3266 | ||
be7de5f9 PB |
3267 | /* module_blacklist is a comma-separated list of module names */ |
3268 | static char *module_blacklist; | |
96b5b194 | 3269 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3270 | { |
3271 | const char *p; | |
3272 | size_t len; | |
3273 | ||
3274 | if (!module_blacklist) | |
3275 | return false; | |
3276 | ||
3277 | for (p = module_blacklist; *p; p += len) { | |
3278 | len = strcspn(p, ","); | |
3279 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3280 | return true; | |
3281 | if (p[len] == ',') | |
3282 | len++; | |
3283 | } | |
3284 | return false; | |
3285 | } | |
3286 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3287 | ||
2f3238ae | 3288 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3289 | { |
1da177e4 | 3290 | struct module *mod; |
444d13ff | 3291 | unsigned int ndx; |
d913188c | 3292 | int err; |
3ae91c21 | 3293 | |
81a0abd9 | 3294 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3295 | if (err) |
3296 | return ERR_PTR(err); | |
1da177e4 | 3297 | |
1da177e4 | 3298 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3299 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3300 | info->secstrings, info->mod); |
1da177e4 | 3301 | if (err < 0) |
8d8022e8 | 3302 | return ERR_PTR(err); |
1da177e4 | 3303 | |
8d8022e8 RR |
3304 | /* We will do a special allocation for per-cpu sections later. */ |
3305 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3306 | |
444d13ff JY |
3307 | /* |
3308 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3309 | * layout_sections() can put it in the right place. | |
3310 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3311 | */ | |
3312 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3313 | if (ndx) |
3314 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3315 | /* | |
3316 | * Mark the __jump_table section as ro_after_init as well: these data | |
3317 | * structures are never modified, with the exception of entries that | |
3318 | * refer to code in the __init section, which are annotated as such | |
3319 | * at module load time. | |
3320 | */ | |
3321 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3322 | if (ndx) |
3323 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3324 | ||
1da177e4 LT |
3325 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3326 | this is done generically; there doesn't appear to be any | |
3327 | special cases for the architectures. */ | |
81a0abd9 JY |
3328 | layout_sections(info->mod, info); |
3329 | layout_symtab(info->mod, info); | |
1da177e4 | 3330 | |
65b8a9b4 | 3331 | /* Allocate and move to the final place */ |
81a0abd9 | 3332 | err = move_module(info->mod, info); |
d913188c | 3333 | if (err) |
8d8022e8 | 3334 | return ERR_PTR(err); |
d913188c RR |
3335 | |
3336 | /* Module has been copied to its final place now: return it. */ | |
3337 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3338 | kmemleak_load_module(mod, info); |
d913188c | 3339 | return mod; |
d913188c RR |
3340 | } |
3341 | ||
3342 | /* mod is no longer valid after this! */ | |
3343 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3344 | { | |
d913188c | 3345 | percpu_modfree(mod); |
d453cded | 3346 | module_arch_freeing_init(mod); |
7523e4dc RR |
3347 | module_memfree(mod->init_layout.base); |
3348 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3349 | } |
3350 | ||
74e08fcf JB |
3351 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3352 | const Elf_Shdr *sechdrs, | |
3353 | struct module *me) | |
3354 | { | |
3355 | return 0; | |
3356 | } | |
3357 | ||
811d66a0 RR |
3358 | static int post_relocation(struct module *mod, const struct load_info *info) |
3359 | { | |
51f3d0f4 | 3360 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3361 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3362 | ||
3363 | /* Copy relocated percpu area over. */ | |
3364 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3365 | info->sechdrs[info->index.pcpu].sh_size); | |
3366 | ||
51f3d0f4 | 3367 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3368 | add_kallsyms(mod, info); |
3369 | ||
3370 | /* Arch-specific module finalizing. */ | |
3371 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3372 | } | |
3373 | ||
9bb9c3be RR |
3374 | /* Is this module of this name done loading? No locks held. */ |
3375 | static bool finished_loading(const char *name) | |
3376 | { | |
3377 | struct module *mod; | |
3378 | bool ret; | |
3379 | ||
9cc019b8 PZ |
3380 | /* |
3381 | * The module_mutex should not be a heavily contended lock; | |
3382 | * if we get the occasional sleep here, we'll go an extra iteration | |
3383 | * in the wait_event_interruptible(), which is harmless. | |
3384 | */ | |
3385 | sched_annotate_sleep(); | |
9bb9c3be | 3386 | mutex_lock(&module_mutex); |
4f6de4d5 | 3387 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3388 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3389 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3390 | mutex_unlock(&module_mutex); |
3391 | ||
3392 | return ret; | |
3393 | } | |
3394 | ||
34e1169d KC |
3395 | /* Call module constructors. */ |
3396 | static void do_mod_ctors(struct module *mod) | |
3397 | { | |
3398 | #ifdef CONFIG_CONSTRUCTORS | |
3399 | unsigned long i; | |
3400 | ||
3401 | for (i = 0; i < mod->num_ctors; i++) | |
3402 | mod->ctors[i](); | |
3403 | #endif | |
3404 | } | |
3405 | ||
c7496379 RR |
3406 | /* For freeing module_init on success, in case kallsyms traversing */ |
3407 | struct mod_initfree { | |
1a7b7d92 | 3408 | struct llist_node node; |
c7496379 RR |
3409 | void *module_init; |
3410 | }; | |
3411 | ||
1a7b7d92 | 3412 | static void do_free_init(struct work_struct *w) |
c7496379 | 3413 | { |
1a7b7d92 RE |
3414 | struct llist_node *pos, *n, *list; |
3415 | struct mod_initfree *initfree; | |
3416 | ||
3417 | list = llist_del_all(&init_free_list); | |
3418 | ||
3419 | synchronize_rcu(); | |
3420 | ||
3421 | llist_for_each_safe(pos, n, list) { | |
3422 | initfree = container_of(pos, struct mod_initfree, node); | |
3423 | module_memfree(initfree->module_init); | |
3424 | kfree(initfree); | |
3425 | } | |
c7496379 RR |
3426 | } |
3427 | ||
1a7b7d92 RE |
3428 | static int __init modules_wq_init(void) |
3429 | { | |
3430 | INIT_WORK(&init_free_wq, do_free_init); | |
3431 | init_llist_head(&init_free_list); | |
3432 | return 0; | |
3433 | } | |
3434 | module_init(modules_wq_init); | |
3435 | ||
be02a186 JK |
3436 | /* |
3437 | * This is where the real work happens. | |
3438 | * | |
3439 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3440 | * helper command 'lx-symbols'. | |
3441 | */ | |
3442 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3443 | { |
3444 | int ret = 0; | |
c7496379 RR |
3445 | struct mod_initfree *freeinit; |
3446 | ||
3447 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3448 | if (!freeinit) { | |
3449 | ret = -ENOMEM; | |
3450 | goto fail; | |
3451 | } | |
7523e4dc | 3452 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3453 | |
774a1221 TH |
3454 | /* |
3455 | * We want to find out whether @mod uses async during init. Clear | |
3456 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3457 | */ | |
3458 | current->flags &= ~PF_USED_ASYNC; | |
3459 | ||
34e1169d KC |
3460 | do_mod_ctors(mod); |
3461 | /* Start the module */ | |
3462 | if (mod->init != NULL) | |
3463 | ret = do_one_initcall(mod->init); | |
3464 | if (ret < 0) { | |
c7496379 | 3465 | goto fail_free_freeinit; |
34e1169d KC |
3466 | } |
3467 | if (ret > 0) { | |
bddb12b3 AM |
3468 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3469 | "follow 0/-E convention\n" | |
3470 | "%s: loading module anyway...\n", | |
3471 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3472 | dump_stack(); |
3473 | } | |
3474 | ||
3475 | /* Now it's a first class citizen! */ | |
3476 | mod->state = MODULE_STATE_LIVE; | |
3477 | blocking_notifier_call_chain(&module_notify_list, | |
3478 | MODULE_STATE_LIVE, mod); | |
3479 | ||
774a1221 TH |
3480 | /* |
3481 | * We need to finish all async code before the module init sequence | |
3482 | * is done. This has potential to deadlock. For example, a newly | |
3483 | * detected block device can trigger request_module() of the | |
3484 | * default iosched from async probing task. Once userland helper | |
3485 | * reaches here, async_synchronize_full() will wait on the async | |
3486 | * task waiting on request_module() and deadlock. | |
3487 | * | |
3488 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3489 | * iff module init queued any async jobs. This isn't a full | |
3490 | * solution as it will deadlock the same if module loading from | |
3491 | * async jobs nests more than once; however, due to the various | |
3492 | * constraints, this hack seems to be the best option for now. | |
3493 | * Please refer to the following thread for details. | |
3494 | * | |
3495 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3496 | */ | |
f2411da7 | 3497 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3498 | async_synchronize_full(); |
34e1169d | 3499 | |
aba4b5c2 | 3500 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3501 | mod->init_layout.size); |
34e1169d KC |
3502 | mutex_lock(&module_mutex); |
3503 | /* Drop initial reference. */ | |
3504 | module_put(mod); | |
3505 | trim_init_extable(mod); | |
3506 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3507 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3508 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3509 | #endif |
444d13ff | 3510 | module_enable_ro(mod, true); |
93c2e105 | 3511 | mod_tree_remove_init(mod); |
d453cded | 3512 | module_arch_freeing_init(mod); |
7523e4dc RR |
3513 | mod->init_layout.base = NULL; |
3514 | mod->init_layout.size = 0; | |
3515 | mod->init_layout.ro_size = 0; | |
444d13ff | 3516 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3517 | mod->init_layout.text_size = 0; |
c7496379 RR |
3518 | /* |
3519 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3520 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3521 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3522 | * path. module_memfree() cannot be called in an interrupt, so do the |
3523 | * work and call synchronize_rcu() in a work queue. | |
3524 | * | |
ae646f0b JH |
3525 | * Note that module_alloc() on most architectures creates W+X page |
3526 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3527 | * code such as mark_rodata_ro() which depends on those mappings to | |
3528 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3529 | * rcu_barrier() |
c7496379 | 3530 | */ |
1a7b7d92 RE |
3531 | if (llist_add(&freeinit->node, &init_free_list)) |
3532 | schedule_work(&init_free_wq); | |
3533 | ||
34e1169d KC |
3534 | mutex_unlock(&module_mutex); |
3535 | wake_up_all(&module_wq); | |
3536 | ||
3537 | return 0; | |
c7496379 RR |
3538 | |
3539 | fail_free_freeinit: | |
3540 | kfree(freeinit); | |
3541 | fail: | |
3542 | /* Try to protect us from buggy refcounters. */ | |
3543 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3544 | synchronize_rcu(); |
c7496379 RR |
3545 | module_put(mod); |
3546 | blocking_notifier_call_chain(&module_notify_list, | |
3547 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3548 | klp_module_going(mod); |
7dcd182b | 3549 | ftrace_release_mod(mod); |
c7496379 RR |
3550 | free_module(mod); |
3551 | wake_up_all(&module_wq); | |
3552 | return ret; | |
34e1169d KC |
3553 | } |
3554 | ||
3555 | static int may_init_module(void) | |
3556 | { | |
3557 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3558 | return -EPERM; | |
3559 | ||
3560 | return 0; | |
3561 | } | |
3562 | ||
a3535c7e RR |
3563 | /* |
3564 | * We try to place it in the list now to make sure it's unique before | |
3565 | * we dedicate too many resources. In particular, temporary percpu | |
3566 | * memory exhaustion. | |
3567 | */ | |
3568 | static int add_unformed_module(struct module *mod) | |
3569 | { | |
3570 | int err; | |
3571 | struct module *old; | |
3572 | ||
3573 | mod->state = MODULE_STATE_UNFORMED; | |
3574 | ||
3575 | again: | |
3576 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3577 | old = find_module_all(mod->name, strlen(mod->name), true); |
3578 | if (old != NULL) { | |
a3535c7e RR |
3579 | if (old->state == MODULE_STATE_COMING |
3580 | || old->state == MODULE_STATE_UNFORMED) { | |
3581 | /* Wait in case it fails to load. */ | |
3582 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3583 | err = wait_event_interruptible(module_wq, |
3584 | finished_loading(mod->name)); | |
a3535c7e RR |
3585 | if (err) |
3586 | goto out_unlocked; | |
3587 | goto again; | |
3588 | } | |
3589 | err = -EEXIST; | |
3590 | goto out; | |
3591 | } | |
4f666546 | 3592 | mod_update_bounds(mod); |
a3535c7e | 3593 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3594 | mod_tree_insert(mod); |
a3535c7e RR |
3595 | err = 0; |
3596 | ||
3597 | out: | |
3598 | mutex_unlock(&module_mutex); | |
3599 | out_unlocked: | |
3600 | return err; | |
3601 | } | |
3602 | ||
3603 | static int complete_formation(struct module *mod, struct load_info *info) | |
3604 | { | |
3605 | int err; | |
3606 | ||
3607 | mutex_lock(&module_mutex); | |
3608 | ||
3609 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3610 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3611 | if (err < 0) |
3612 | goto out; | |
3613 | ||
3614 | /* This relies on module_mutex for list integrity. */ | |
3615 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3616 | ||
444d13ff | 3617 | module_enable_ro(mod, false); |
85c898db | 3618 | module_enable_nx(mod); |
4982223e | 3619 | |
a3535c7e RR |
3620 | /* Mark state as coming so strong_try_module_get() ignores us, |
3621 | * but kallsyms etc. can see us. */ | |
3622 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3623 | mutex_unlock(&module_mutex); |
3624 | ||
4982223e | 3625 | return 0; |
a3535c7e RR |
3626 | |
3627 | out: | |
3628 | mutex_unlock(&module_mutex); | |
3629 | return err; | |
3630 | } | |
3631 | ||
4c973d16 JY |
3632 | static int prepare_coming_module(struct module *mod) |
3633 | { | |
7e545d6e JY |
3634 | int err; |
3635 | ||
4c973d16 | 3636 | ftrace_module_enable(mod); |
7e545d6e JY |
3637 | err = klp_module_coming(mod); |
3638 | if (err) | |
3639 | return err; | |
3640 | ||
4c973d16 JY |
3641 | blocking_notifier_call_chain(&module_notify_list, |
3642 | MODULE_STATE_COMING, mod); | |
3643 | return 0; | |
3644 | } | |
3645 | ||
ecc86170 LR |
3646 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3647 | void *arg) | |
54041d8a | 3648 | { |
f2411da7 LR |
3649 | struct module *mod = arg; |
3650 | int ret; | |
3651 | ||
3652 | if (strcmp(param, "async_probe") == 0) { | |
3653 | mod->async_probe_requested = true; | |
3654 | return 0; | |
3655 | } | |
3656 | ||
6da0b565 | 3657 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3658 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3659 | if (ret != 0) |
3660 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3661 | return 0; |
3662 | } | |
3663 | ||
d913188c RR |
3664 | /* Allocate and load the module: note that size of section 0 is always |
3665 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3666 | static int load_module(struct load_info *info, const char __user *uargs, |
3667 | int flags) | |
d913188c | 3668 | { |
a3535c7e | 3669 | struct module *mod; |
5fdc7db6 | 3670 | long err = 0; |
51e158c1 | 3671 | char *after_dashes; |
d913188c | 3672 | |
5fdc7db6 JY |
3673 | err = elf_header_check(info); |
3674 | if (err) | |
3675 | goto free_copy; | |
3676 | ||
3677 | err = setup_load_info(info, flags); | |
3678 | if (err) | |
3679 | goto free_copy; | |
3680 | ||
3681 | if (blacklisted(info->name)) { | |
3682 | err = -EPERM; | |
3683 | goto free_copy; | |
3684 | } | |
3685 | ||
bca014ca | 3686 | err = module_sig_check(info, flags); |
34e1169d KC |
3687 | if (err) |
3688 | goto free_copy; | |
d913188c | 3689 | |
5fdc7db6 | 3690 | err = rewrite_section_headers(info, flags); |
d913188c | 3691 | if (err) |
34e1169d | 3692 | goto free_copy; |
d913188c | 3693 | |
5fdc7db6 JY |
3694 | /* Check module struct version now, before we try to use module. */ |
3695 | if (!check_modstruct_version(info, info->mod)) { | |
3696 | err = -ENOEXEC; | |
3697 | goto free_copy; | |
3698 | } | |
3699 | ||
d913188c | 3700 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3701 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3702 | if (IS_ERR(mod)) { |
3703 | err = PTR_ERR(mod); | |
d913188c | 3704 | goto free_copy; |
1da177e4 | 3705 | } |
1da177e4 | 3706 | |
ca86cad7 RGB |
3707 | audit_log_kern_module(mod->name); |
3708 | ||
a3535c7e RR |
3709 | /* Reserve our place in the list. */ |
3710 | err = add_unformed_module(mod); | |
3711 | if (err) | |
1fb9341a | 3712 | goto free_module; |
1fb9341a | 3713 | |
106a4ee2 | 3714 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3715 | mod->sig_ok = info->sig_ok; |
64748a2c | 3716 | if (!mod->sig_ok) { |
bddb12b3 | 3717 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3718 | "and/or required key missing - tainting " |
bddb12b3 | 3719 | "kernel\n", mod->name); |
66cc69e3 | 3720 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3721 | } |
106a4ee2 RR |
3722 | #endif |
3723 | ||
8d8022e8 | 3724 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3725 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3726 | if (err) |
3727 | goto unlink_mod; | |
3728 | ||
49668688 | 3729 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3730 | err = module_unload_init(mod); |
3731 | if (err) | |
1fb9341a | 3732 | goto unlink_mod; |
1da177e4 | 3733 | |
cf2fde7b | 3734 | init_param_lock(mod); |
b51d23e4 | 3735 | |
22e268eb RR |
3736 | /* Now we've got everything in the final locations, we can |
3737 | * find optional sections. */ | |
eb3057df FH |
3738 | err = find_module_sections(mod, info); |
3739 | if (err) | |
3740 | goto free_unload; | |
9b37ccfc | 3741 | |
49668688 | 3742 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3743 | if (err) |
3744 | goto free_unload; | |
9841d61d | 3745 | |
c988d2b2 | 3746 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3747 | setup_modinfo(mod, info); |
c988d2b2 | 3748 | |
1da177e4 | 3749 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3750 | err = simplify_symbols(mod, info); |
1da177e4 | 3751 | if (err < 0) |
d913188c | 3752 | goto free_modinfo; |
1da177e4 | 3753 | |
34e1169d | 3754 | err = apply_relocations(mod, info); |
22e268eb | 3755 | if (err < 0) |
d913188c | 3756 | goto free_modinfo; |
1da177e4 | 3757 | |
34e1169d | 3758 | err = post_relocation(mod, info); |
1da177e4 | 3759 | if (err < 0) |
d913188c | 3760 | goto free_modinfo; |
1da177e4 | 3761 | |
22e268eb | 3762 | flush_module_icache(mod); |
378bac82 | 3763 | |
6526c534 RR |
3764 | /* Now copy in args */ |
3765 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3766 | if (IS_ERR(mod->args)) { | |
3767 | err = PTR_ERR(mod->args); | |
3768 | goto free_arch_cleanup; | |
3769 | } | |
8d3b33f6 | 3770 | |
52796312 | 3771 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3772 | |
a949ae56 SRRH |
3773 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3774 | ftrace_module_init(mod); | |
3775 | ||
a3535c7e RR |
3776 | /* Finally it's fully formed, ready to start executing. */ |
3777 | err = complete_formation(mod, info); | |
3778 | if (err) | |
1fb9341a | 3779 | goto ddebug_cleanup; |
be593f4c | 3780 | |
4c973d16 JY |
3781 | err = prepare_coming_module(mod); |
3782 | if (err) | |
3783 | goto bug_cleanup; | |
3784 | ||
51f3d0f4 | 3785 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3786 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3787 | -32768, 32767, mod, |
ecc86170 | 3788 | unknown_module_param_cb); |
51e158c1 RR |
3789 | if (IS_ERR(after_dashes)) { |
3790 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3791 | goto coming_cleanup; |
51e158c1 RR |
3792 | } else if (after_dashes) { |
3793 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3794 | mod->name, after_dashes); | |
3795 | } | |
1da177e4 | 3796 | |
ca86cad7 | 3797 | /* Link in to sysfs. */ |
34e1169d | 3798 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3799 | if (err < 0) |
4c973d16 | 3800 | goto coming_cleanup; |
80a3d1bb | 3801 | |
1ce15ef4 JY |
3802 | if (is_livepatch_module(mod)) { |
3803 | err = copy_module_elf(mod, info); | |
3804 | if (err < 0) | |
3805 | goto sysfs_cleanup; | |
3806 | } | |
3807 | ||
48fd1188 | 3808 | /* Get rid of temporary copy. */ |
34e1169d | 3809 | free_copy(info); |
1da177e4 LT |
3810 | |
3811 | /* Done! */ | |
51f3d0f4 | 3812 | trace_module_load(mod); |
34e1169d KC |
3813 | |
3814 | return do_init_module(mod); | |
1da177e4 | 3815 | |
1ce15ef4 JY |
3816 | sysfs_cleanup: |
3817 | mod_sysfs_teardown(mod); | |
4c973d16 | 3818 | coming_cleanup: |
885a78d4 | 3819 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3820 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3821 | blocking_notifier_call_chain(&module_notify_list, |
3822 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3823 | klp_module_going(mod); |
1fb9341a RR |
3824 | bug_cleanup: |
3825 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3826 | mutex_lock(&module_mutex); |
5336377d | 3827 | module_bug_cleanup(mod); |
ee61abb3 | 3828 | mutex_unlock(&module_mutex); |
ff7e0055 | 3829 | |
a3535c7e | 3830 | ddebug_cleanup: |
1323eac7 | 3831 | ftrace_release_mod(mod); |
52796312 | 3832 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 3833 | synchronize_rcu(); |
6526c534 RR |
3834 | kfree(mod->args); |
3835 | free_arch_cleanup: | |
1da177e4 | 3836 | module_arch_cleanup(mod); |
d913188c | 3837 | free_modinfo: |
a263f776 | 3838 | free_modinfo(mod); |
22e268eb | 3839 | free_unload: |
1da177e4 | 3840 | module_unload_free(mod); |
1fb9341a RR |
3841 | unlink_mod: |
3842 | mutex_lock(&module_mutex); | |
3843 | /* Unlink carefully: kallsyms could be walking list. */ | |
3844 | list_del_rcu(&mod->list); | |
758556bd | 3845 | mod_tree_remove(mod); |
1fb9341a | 3846 | wake_up_all(&module_wq); |
0be964be | 3847 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 3848 | synchronize_rcu(); |
1fb9341a | 3849 | mutex_unlock(&module_mutex); |
d913188c | 3850 | free_module: |
35a9393c | 3851 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3852 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3853 | |
34e1169d | 3854 | module_deallocate(mod, info); |
d913188c | 3855 | free_copy: |
34e1169d KC |
3856 | free_copy(info); |
3857 | return err; | |
b99b87f7 PO |
3858 | } |
3859 | ||
17da2bd9 HC |
3860 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3861 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3862 | { |
34e1169d KC |
3863 | int err; |
3864 | struct load_info info = { }; | |
1da177e4 | 3865 | |
34e1169d KC |
3866 | err = may_init_module(); |
3867 | if (err) | |
3868 | return err; | |
1da177e4 | 3869 | |
34e1169d KC |
3870 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3871 | umod, len, uargs); | |
1da177e4 | 3872 | |
34e1169d KC |
3873 | err = copy_module_from_user(umod, len, &info); |
3874 | if (err) | |
3875 | return err; | |
1da177e4 | 3876 | |
2f3238ae | 3877 | return load_module(&info, uargs, 0); |
34e1169d | 3878 | } |
94462ad3 | 3879 | |
2f3238ae | 3880 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3881 | { |
34e1169d | 3882 | struct load_info info = { }; |
a1db7420 MZ |
3883 | loff_t size; |
3884 | void *hdr; | |
3885 | int err; | |
94462ad3 | 3886 | |
34e1169d KC |
3887 | err = may_init_module(); |
3888 | if (err) | |
3889 | return err; | |
1da177e4 | 3890 | |
2f3238ae | 3891 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3892 | |
2f3238ae RR |
3893 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3894 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3895 | return -EINVAL; | |
d6de2c80 | 3896 | |
a1db7420 MZ |
3897 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
3898 | READING_MODULE); | |
34e1169d KC |
3899 | if (err) |
3900 | return err; | |
a1db7420 MZ |
3901 | info.hdr = hdr; |
3902 | info.len = size; | |
1da177e4 | 3903 | |
2f3238ae | 3904 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3905 | } |
3906 | ||
3907 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3908 | { | |
3909 | return ((void *)addr >= start && (void *)addr < start + size); | |
3910 | } | |
3911 | ||
3912 | #ifdef CONFIG_KALLSYMS | |
3913 | /* | |
3914 | * This ignores the intensely annoying "mapping symbols" found | |
3915 | * in ARM ELF files: $a, $t and $d. | |
3916 | */ | |
3917 | static inline int is_arm_mapping_symbol(const char *str) | |
3918 | { | |
2e3a10a1 RK |
3919 | if (str[0] == '.' && str[1] == 'L') |
3920 | return true; | |
6c34f1f5 | 3921 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3922 | && (str[2] == '\0' || str[2] == '.'); |
3923 | } | |
3924 | ||
2d25bc55 | 3925 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 3926 | { |
8244062e | 3927 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
3928 | } |
3929 | ||
2d25bc55 JY |
3930 | /* |
3931 | * Given a module and address, find the corresponding symbol and return its name | |
3932 | * while providing its size and offset if needed. | |
3933 | */ | |
3934 | static const char *find_kallsyms_symbol(struct module *mod, | |
3935 | unsigned long addr, | |
3936 | unsigned long *size, | |
3937 | unsigned long *offset) | |
1da177e4 LT |
3938 | { |
3939 | unsigned int i, best = 0; | |
93d77e7f | 3940 | unsigned long nextval, bestval; |
8244062e | 3941 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
3942 | |
3943 | /* At worse, next value is at end of module */ | |
a06f6211 | 3944 | if (within_module_init(addr, mod)) |
7523e4dc | 3945 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 3946 | else |
7523e4dc | 3947 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 3948 | |
93d77e7f VW |
3949 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
3950 | ||
25985edc | 3951 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3952 | starts real symbols at 1). */ |
8244062e | 3953 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
3954 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
3955 | unsigned long thisval = kallsyms_symbol_value(sym); | |
3956 | ||
3957 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
3958 | continue; |
3959 | ||
3960 | /* We ignore unnamed symbols: they're uninformative | |
3961 | * and inserted at a whim. */ | |
2d25bc55 JY |
3962 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
3963 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
3964 | continue; |
3965 | ||
93d77e7f | 3966 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 3967 | best = i; |
93d77e7f VW |
3968 | bestval = thisval; |
3969 | } | |
3970 | if (thisval > addr && thisval < nextval) | |
3971 | nextval = thisval; | |
1da177e4 LT |
3972 | } |
3973 | ||
3974 | if (!best) | |
3975 | return NULL; | |
3976 | ||
ffb45122 | 3977 | if (size) |
93d77e7f | 3978 | *size = nextval - bestval; |
ffb45122 | 3979 | if (offset) |
93d77e7f | 3980 | *offset = addr - bestval; |
2d25bc55 JY |
3981 | |
3982 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
3983 | } |
3984 | ||
b865ea64 SS |
3985 | void * __weak dereference_module_function_descriptor(struct module *mod, |
3986 | void *ptr) | |
3987 | { | |
3988 | return ptr; | |
3989 | } | |
3990 | ||
6dd06c9f RR |
3991 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3992 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3993 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3994 | unsigned long *size, |
3995 | unsigned long *offset, | |
3996 | char **modname, | |
3997 | char *namebuf) | |
1da177e4 | 3998 | { |
cb2a5205 | 3999 | const char *ret = NULL; |
b7df4d1b | 4000 | struct module *mod; |
1da177e4 | 4001 | |
cb2a5205 | 4002 | preempt_disable(); |
b7df4d1b PZ |
4003 | mod = __module_address(addr); |
4004 | if (mod) { | |
4005 | if (modname) | |
4006 | *modname = mod->name; | |
2d25bc55 JY |
4007 | |
4008 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4009 | } |
6dd06c9f RR |
4010 | /* Make a copy in here where it's safe */ |
4011 | if (ret) { | |
4012 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4013 | ret = namebuf; | |
4014 | } | |
cb2a5205 | 4015 | preempt_enable(); |
b7df4d1b | 4016 | |
92dfc9dc | 4017 | return ret; |
1da177e4 LT |
4018 | } |
4019 | ||
9d65cb4a AD |
4020 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4021 | { | |
4022 | struct module *mod; | |
4023 | ||
cb2a5205 | 4024 | preempt_disable(); |
d72b3751 | 4025 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4026 | if (mod->state == MODULE_STATE_UNFORMED) |
4027 | continue; | |
9b20a352 | 4028 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4029 | const char *sym; |
4030 | ||
2d25bc55 | 4031 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4032 | if (!sym) |
4033 | goto out; | |
2d25bc55 | 4034 | |
9281acea | 4035 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4036 | preempt_enable(); |
9d65cb4a AD |
4037 | return 0; |
4038 | } | |
4039 | } | |
4040 | out: | |
cb2a5205 | 4041 | preempt_enable(); |
9d65cb4a AD |
4042 | return -ERANGE; |
4043 | } | |
4044 | ||
a5c43dae AD |
4045 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4046 | unsigned long *offset, char *modname, char *name) | |
4047 | { | |
4048 | struct module *mod; | |
4049 | ||
cb2a5205 | 4050 | preempt_disable(); |
d72b3751 | 4051 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4052 | if (mod->state == MODULE_STATE_UNFORMED) |
4053 | continue; | |
9b20a352 | 4054 | if (within_module(addr, mod)) { |
a5c43dae AD |
4055 | const char *sym; |
4056 | ||
2d25bc55 | 4057 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4058 | if (!sym) |
4059 | goto out; | |
4060 | if (modname) | |
9281acea | 4061 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4062 | if (name) |
9281acea | 4063 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4064 | preempt_enable(); |
a5c43dae AD |
4065 | return 0; |
4066 | } | |
4067 | } | |
4068 | out: | |
cb2a5205 | 4069 | preempt_enable(); |
a5c43dae AD |
4070 | return -ERANGE; |
4071 | } | |
4072 | ||
ea07890a AD |
4073 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4074 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4075 | { |
4076 | struct module *mod; | |
4077 | ||
cb2a5205 | 4078 | preempt_disable(); |
d72b3751 | 4079 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4080 | struct mod_kallsyms *kallsyms; |
4081 | ||
0d21b0e3 RR |
4082 | if (mod->state == MODULE_STATE_UNFORMED) |
4083 | continue; | |
8244062e RR |
4084 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4085 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4086 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4087 | ||
4088 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4089 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4090 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4091 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4092 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4093 | preempt_enable(); |
ea07890a | 4094 | return 0; |
1da177e4 | 4095 | } |
8244062e | 4096 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4097 | } |
cb2a5205 | 4098 | preempt_enable(); |
ea07890a | 4099 | return -ERANGE; |
1da177e4 LT |
4100 | } |
4101 | ||
2d25bc55 JY |
4102 | /* Given a module and name of symbol, find and return the symbol's value */ |
4103 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4104 | { |
4105 | unsigned int i; | |
8244062e | 4106 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4107 | |
93d77e7f VW |
4108 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4109 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4110 | ||
2d25bc55 | 4111 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4112 | sym->st_shndx != SHN_UNDEF) |
4113 | return kallsyms_symbol_value(sym); | |
4114 | } | |
1da177e4 LT |
4115 | return 0; |
4116 | } | |
4117 | ||
4118 | /* Look for this name: can be of form module:name. */ | |
4119 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4120 | { | |
4121 | struct module *mod; | |
4122 | char *colon; | |
4123 | unsigned long ret = 0; | |
4124 | ||
4125 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4126 | preempt_disable(); |
17586188 | 4127 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4128 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4129 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4130 | } else { |
0d21b0e3 RR |
4131 | list_for_each_entry_rcu(mod, &modules, list) { |
4132 | if (mod->state == MODULE_STATE_UNFORMED) | |
4133 | continue; | |
2d25bc55 | 4134 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4135 | break; |
0d21b0e3 | 4136 | } |
1da177e4 | 4137 | } |
cb2a5205 | 4138 | preempt_enable(); |
1da177e4 LT |
4139 | return ret; |
4140 | } | |
75a66614 AK |
4141 | |
4142 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4143 | struct module *, unsigned long), | |
4144 | void *data) | |
4145 | { | |
4146 | struct module *mod; | |
4147 | unsigned int i; | |
4148 | int ret; | |
4149 | ||
0be964be PZ |
4150 | module_assert_mutex(); |
4151 | ||
75a66614 | 4152 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4153 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4154 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4155 | ||
0d21b0e3 RR |
4156 | if (mod->state == MODULE_STATE_UNFORMED) |
4157 | continue; | |
8244062e | 4158 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4159 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4160 | |
93d77e7f | 4161 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4162 | continue; |
4163 | ||
2d25bc55 | 4164 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4165 | mod, kallsyms_symbol_value(sym)); |
75a66614 AK |
4166 | if (ret != 0) |
4167 | return ret; | |
4168 | } | |
4169 | } | |
4170 | return 0; | |
4171 | } | |
1da177e4 LT |
4172 | #endif /* CONFIG_KALLSYMS */ |
4173 | ||
7fd8329b PM |
4174 | /* Maximum number of characters written by module_flags() */ |
4175 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4176 | ||
4177 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4178 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4179 | { |
4180 | int bx = 0; | |
4181 | ||
0d21b0e3 | 4182 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4183 | if (mod->taints || |
4184 | mod->state == MODULE_STATE_GOING || | |
4185 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4186 | buf[bx++] = '('; |
cca3e707 | 4187 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4188 | /* Show a - for module-is-being-unloaded */ |
4189 | if (mod->state == MODULE_STATE_GOING) | |
4190 | buf[bx++] = '-'; | |
4191 | /* Show a + for module-is-being-loaded */ | |
4192 | if (mod->state == MODULE_STATE_COMING) | |
4193 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4194 | buf[bx++] = ')'; |
4195 | } | |
4196 | buf[bx] = '\0'; | |
4197 | ||
4198 | return buf; | |
4199 | } | |
4200 | ||
3b5d5c6b AD |
4201 | #ifdef CONFIG_PROC_FS |
4202 | /* Called by the /proc file system to return a list of modules. */ | |
4203 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4204 | { | |
4205 | mutex_lock(&module_mutex); | |
4206 | return seq_list_start(&modules, *pos); | |
4207 | } | |
4208 | ||
4209 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4210 | { | |
4211 | return seq_list_next(p, &modules, pos); | |
4212 | } | |
4213 | ||
4214 | static void m_stop(struct seq_file *m, void *p) | |
4215 | { | |
4216 | mutex_unlock(&module_mutex); | |
4217 | } | |
4218 | ||
1da177e4 LT |
4219 | static int m_show(struct seq_file *m, void *p) |
4220 | { | |
4221 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4222 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4223 | void *value; |
fa3ba2e8 | 4224 | |
0d21b0e3 RR |
4225 | /* We always ignore unformed modules. */ |
4226 | if (mod->state == MODULE_STATE_UNFORMED) | |
4227 | return 0; | |
4228 | ||
2f0f2a33 | 4229 | seq_printf(m, "%s %u", |
7523e4dc | 4230 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4231 | print_unload_info(m, mod); |
4232 | ||
4233 | /* Informative for users. */ | |
4234 | seq_printf(m, " %s", | |
6da0b565 IA |
4235 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4236 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4237 | "Live"); |
4238 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4239 | value = m->private ? NULL : mod->core_layout.base; |
4240 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4241 | |
fa3ba2e8 FM |
4242 | /* Taints info */ |
4243 | if (mod->taints) | |
21aa9280 | 4244 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4245 | |
6da0b565 | 4246 | seq_puts(m, "\n"); |
1da177e4 LT |
4247 | return 0; |
4248 | } | |
4249 | ||
4250 | /* Format: modulename size refcount deps address | |
4251 | ||
4252 | Where refcount is a number or -, and deps is a comma-separated list | |
4253 | of depends or -. | |
4254 | */ | |
3b5d5c6b | 4255 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4256 | .start = m_start, |
4257 | .next = m_next, | |
4258 | .stop = m_stop, | |
4259 | .show = m_show | |
4260 | }; | |
4261 | ||
516fb7f2 LT |
4262 | /* |
4263 | * This also sets the "private" pointer to non-NULL if the | |
4264 | * kernel pointers should be hidden (so you can just test | |
4265 | * "m->private" to see if you should keep the values private). | |
4266 | * | |
4267 | * We use the same logic as for /proc/kallsyms. | |
4268 | */ | |
3b5d5c6b AD |
4269 | static int modules_open(struct inode *inode, struct file *file) |
4270 | { | |
516fb7f2 LT |
4271 | int err = seq_open(file, &modules_op); |
4272 | ||
4273 | if (!err) { | |
4274 | struct seq_file *m = file->private_data; | |
4275 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4276 | } | |
4277 | ||
3f553b30 | 4278 | return err; |
3b5d5c6b AD |
4279 | } |
4280 | ||
4281 | static const struct file_operations proc_modules_operations = { | |
4282 | .open = modules_open, | |
4283 | .read = seq_read, | |
4284 | .llseek = seq_lseek, | |
4285 | .release = seq_release, | |
4286 | }; | |
4287 | ||
4288 | static int __init proc_modules_init(void) | |
4289 | { | |
4290 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4291 | return 0; | |
4292 | } | |
4293 | module_init(proc_modules_init); | |
4294 | #endif | |
4295 | ||
1da177e4 LT |
4296 | /* Given an address, look for it in the module exception tables. */ |
4297 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4298 | { | |
1da177e4 LT |
4299 | const struct exception_table_entry *e = NULL; |
4300 | struct module *mod; | |
4301 | ||
24da1cbf | 4302 | preempt_disable(); |
5ff22646 PZ |
4303 | mod = __module_address(addr); |
4304 | if (!mod) | |
4305 | goto out; | |
22a8bdeb | 4306 | |
5ff22646 PZ |
4307 | if (!mod->num_exentries) |
4308 | goto out; | |
4309 | ||
4310 | e = search_extable(mod->extable, | |
a94c33dd | 4311 | mod->num_exentries, |
5ff22646 PZ |
4312 | addr); |
4313 | out: | |
24da1cbf | 4314 | preempt_enable(); |
1da177e4 | 4315 | |
5ff22646 PZ |
4316 | /* |
4317 | * Now, if we found one, we are running inside it now, hence | |
4318 | * we cannot unload the module, hence no refcnt needed. | |
4319 | */ | |
1da177e4 LT |
4320 | return e; |
4321 | } | |
4322 | ||
4d435f9d | 4323 | /* |
e610499e RR |
4324 | * is_module_address - is this address inside a module? |
4325 | * @addr: the address to check. | |
4326 | * | |
4327 | * See is_module_text_address() if you simply want to see if the address | |
4328 | * is code (not data). | |
4d435f9d | 4329 | */ |
e610499e | 4330 | bool is_module_address(unsigned long addr) |
4d435f9d | 4331 | { |
e610499e | 4332 | bool ret; |
4d435f9d | 4333 | |
24da1cbf | 4334 | preempt_disable(); |
e610499e | 4335 | ret = __module_address(addr) != NULL; |
24da1cbf | 4336 | preempt_enable(); |
4d435f9d | 4337 | |
e610499e | 4338 | return ret; |
4d435f9d IM |
4339 | } |
4340 | ||
e610499e RR |
4341 | /* |
4342 | * __module_address - get the module which contains an address. | |
4343 | * @addr: the address. | |
4344 | * | |
4345 | * Must be called with preempt disabled or module mutex held so that | |
4346 | * module doesn't get freed during this. | |
4347 | */ | |
714f83d5 | 4348 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4349 | { |
4350 | struct module *mod; | |
4351 | ||
3a642e99 RR |
4352 | if (addr < module_addr_min || addr > module_addr_max) |
4353 | return NULL; | |
4354 | ||
0be964be PZ |
4355 | module_assert_mutex_or_preempt(); |
4356 | ||
6c9692e2 | 4357 | mod = mod_find(addr); |
93c2e105 PZ |
4358 | if (mod) { |
4359 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4360 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4361 | mod = NULL; |
0d21b0e3 | 4362 | } |
93c2e105 | 4363 | return mod; |
1da177e4 | 4364 | } |
c6b37801 | 4365 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4366 | |
e610499e RR |
4367 | /* |
4368 | * is_module_text_address - is this address inside module code? | |
4369 | * @addr: the address to check. | |
4370 | * | |
4371 | * See is_module_address() if you simply want to see if the address is | |
4372 | * anywhere in a module. See kernel_text_address() for testing if an | |
4373 | * address corresponds to kernel or module code. | |
4374 | */ | |
4375 | bool is_module_text_address(unsigned long addr) | |
4376 | { | |
4377 | bool ret; | |
4378 | ||
4379 | preempt_disable(); | |
4380 | ret = __module_text_address(addr) != NULL; | |
4381 | preempt_enable(); | |
4382 | ||
4383 | return ret; | |
4384 | } | |
4385 | ||
4386 | /* | |
4387 | * __module_text_address - get the module whose code contains an address. | |
4388 | * @addr: the address. | |
4389 | * | |
4390 | * Must be called with preempt disabled or module mutex held so that | |
4391 | * module doesn't get freed during this. | |
4392 | */ | |
4393 | struct module *__module_text_address(unsigned long addr) | |
4394 | { | |
4395 | struct module *mod = __module_address(addr); | |
4396 | if (mod) { | |
4397 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4398 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4399 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4400 | mod = NULL; |
4401 | } | |
4402 | return mod; | |
4403 | } | |
c6b37801 | 4404 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4405 | |
1da177e4 LT |
4406 | /* Don't grab lock, we're oopsing. */ |
4407 | void print_modules(void) | |
4408 | { | |
4409 | struct module *mod; | |
7fd8329b | 4410 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4411 | |
b231125a | 4412 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4413 | /* Most callers should already have preempt disabled, but make sure */ |
4414 | preempt_disable(); | |
0d21b0e3 RR |
4415 | list_for_each_entry_rcu(mod, &modules, list) { |
4416 | if (mod->state == MODULE_STATE_UNFORMED) | |
4417 | continue; | |
27bba4d6 | 4418 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4419 | } |
d72b3751 | 4420 | preempt_enable(); |
e14af7ee | 4421 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4422 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4423 | pr_cont("\n"); | |
1da177e4 LT |
4424 | } |
4425 | ||
1da177e4 | 4426 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4427 | /* Generate the signature for all relevant module structures here. |
4428 | * If these change, we don't want to try to parse the module. */ | |
4429 | void module_layout(struct module *mod, | |
4430 | struct modversion_info *ver, | |
4431 | struct kernel_param *kp, | |
4432 | struct kernel_symbol *ks, | |
65498646 | 4433 | struct tracepoint * const *tp) |
8c8ef42a RR |
4434 | { |
4435 | } | |
4436 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4437 | #endif |