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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 | 65 | /* |
66 | * Modules' sections will be aligned on page boundaries | |
3b5be16c HZ |
67 | * to ensure complete separation of code and data, but |
68 | * only when CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y | |
84e1c6bb | 69 | */ |
3b5be16c | 70 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb | 71 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
3b5be16c HZ |
72 | #else |
73 | # define debug_align(X) (X) | |
74 | #endif | |
84e1c6bb | 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 | 1494 | nloaded++; |
8d1b73dd | 1495 | size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
1da177e4 LT |
1496 | sizeof(sect_attrs->grp.attrs[0])); |
1497 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1498 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1499 | if (sect_attrs == NULL) | |
1da177e4 LT |
1500 | return; |
1501 | ||
1502 | /* Setup section attributes. */ | |
1503 | sect_attrs->grp.name = "sections"; | |
1504 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1505 | ||
04b1db9f | 1506 | sect_attrs->nsections = 0; |
1da177e4 LT |
1507 | sattr = §_attrs->attrs[0]; |
1508 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1509 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1510 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1511 | if (sect_empty(sec)) | |
35dead42 | 1512 | continue; |
8f6d0378 RR |
1513 | sattr->address = sec->sh_addr; |
1514 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1515 | GFP_KERNEL); |
1516 | if (sattr->name == NULL) | |
1517 | goto out; | |
1518 | sect_attrs->nsections++; | |
361795b1 | 1519 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1520 | sattr->mattr.show = module_sect_show; |
1521 | sattr->mattr.store = NULL; | |
1522 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1523 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1524 | *(gattr++) = &(sattr++)->mattr.attr; |
1525 | } | |
1526 | *gattr = NULL; | |
1527 | ||
1528 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1529 | goto out; | |
1530 | ||
1531 | mod->sect_attrs = sect_attrs; | |
1532 | return; | |
1533 | out: | |
04b1db9f | 1534 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1535 | } |
1536 | ||
1537 | static void remove_sect_attrs(struct module *mod) | |
1538 | { | |
1539 | if (mod->sect_attrs) { | |
1540 | sysfs_remove_group(&mod->mkobj.kobj, | |
1541 | &mod->sect_attrs->grp); | |
1542 | /* We are positive that no one is using any sect attrs | |
1543 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1544 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1545 | mod->sect_attrs = NULL; |
1546 | } | |
1547 | } | |
1548 | ||
6d760133 RM |
1549 | /* |
1550 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1551 | */ | |
1552 | ||
1553 | struct module_notes_attrs { | |
1554 | struct kobject *dir; | |
1555 | unsigned int notes; | |
1556 | struct bin_attribute attrs[0]; | |
1557 | }; | |
1558 | ||
2c3c8bea | 1559 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1560 | struct bin_attribute *bin_attr, |
1561 | char *buf, loff_t pos, size_t count) | |
1562 | { | |
1563 | /* | |
1564 | * The caller checked the pos and count against our size. | |
1565 | */ | |
1566 | memcpy(buf, bin_attr->private + pos, count); | |
1567 | return count; | |
1568 | } | |
1569 | ||
1570 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1571 | unsigned int i) | |
1572 | { | |
1573 | if (notes_attrs->dir) { | |
1574 | while (i-- > 0) | |
1575 | sysfs_remove_bin_file(notes_attrs->dir, | |
1576 | ¬es_attrs->attrs[i]); | |
e9432093 | 1577 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1578 | } |
1579 | kfree(notes_attrs); | |
1580 | } | |
1581 | ||
8f6d0378 | 1582 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1583 | { |
1584 | unsigned int notes, loaded, i; | |
1585 | struct module_notes_attrs *notes_attrs; | |
1586 | struct bin_attribute *nattr; | |
1587 | ||
ea6bff36 IM |
1588 | /* failed to create section attributes, so can't create notes */ |
1589 | if (!mod->sect_attrs) | |
1590 | return; | |
1591 | ||
6d760133 RM |
1592 | /* Count notes sections and allocate structures. */ |
1593 | notes = 0; | |
8f6d0378 RR |
1594 | for (i = 0; i < info->hdr->e_shnum; i++) |
1595 | if (!sect_empty(&info->sechdrs[i]) && | |
1596 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1597 | ++notes; |
1598 | ||
1599 | if (notes == 0) | |
1600 | return; | |
1601 | ||
acafe7e3 | 1602 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1603 | GFP_KERNEL); |
1604 | if (notes_attrs == NULL) | |
1605 | return; | |
1606 | ||
1607 | notes_attrs->notes = notes; | |
1608 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1609 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1610 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1611 | continue; |
8f6d0378 | 1612 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1613 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1614 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1615 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1616 | nattr->size = info->sechdrs[i].sh_size; |
1617 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1618 | nattr->read = module_notes_read; |
1619 | ++nattr; | |
1620 | } | |
1621 | ++loaded; | |
1622 | } | |
1623 | ||
4ff6abff | 1624 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1625 | if (!notes_attrs->dir) |
1626 | goto out; | |
1627 | ||
1628 | for (i = 0; i < notes; ++i) | |
1629 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1630 | ¬es_attrs->attrs[i])) | |
1631 | goto out; | |
1632 | ||
1633 | mod->notes_attrs = notes_attrs; | |
1634 | return; | |
1635 | ||
1636 | out: | |
1637 | free_notes_attrs(notes_attrs, i); | |
1638 | } | |
1639 | ||
1640 | static void remove_notes_attrs(struct module *mod) | |
1641 | { | |
1642 | if (mod->notes_attrs) | |
1643 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1644 | } | |
1645 | ||
1da177e4 | 1646 | #else |
04b1db9f | 1647 | |
8f6d0378 RR |
1648 | static inline void add_sect_attrs(struct module *mod, |
1649 | const struct load_info *info) | |
1da177e4 LT |
1650 | { |
1651 | } | |
1652 | ||
1653 | static inline void remove_sect_attrs(struct module *mod) | |
1654 | { | |
1655 | } | |
6d760133 | 1656 | |
8f6d0378 RR |
1657 | static inline void add_notes_attrs(struct module *mod, |
1658 | const struct load_info *info) | |
6d760133 RM |
1659 | { |
1660 | } | |
1661 | ||
1662 | static inline void remove_notes_attrs(struct module *mod) | |
1663 | { | |
1664 | } | |
8f6d0378 | 1665 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1666 | |
1ba5c08b | 1667 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1668 | { |
1669 | #ifdef CONFIG_MODULE_UNLOAD | |
1670 | struct module_use *use; | |
80a3d1bb | 1671 | |
75676500 | 1672 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1673 | list_for_each_entry(use, &mod->target_list, target_list) |
1674 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1675 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1676 | #endif |
1677 | } | |
1678 | ||
1ba5c08b | 1679 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1680 | { |
1ba5c08b | 1681 | int ret = 0; |
80a3d1bb RR |
1682 | #ifdef CONFIG_MODULE_UNLOAD |
1683 | struct module_use *use; | |
1684 | ||
75676500 | 1685 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1686 | list_for_each_entry(use, &mod->target_list, target_list) { |
1687 | ret = sysfs_create_link(use->target->holders_dir, | |
1688 | &mod->mkobj.kobj, mod->name); | |
1689 | if (ret) | |
1690 | break; | |
1691 | } | |
75676500 | 1692 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1693 | if (ret) |
1694 | del_usage_links(mod); | |
80a3d1bb | 1695 | #endif |
1ba5c08b | 1696 | return ret; |
80a3d1bb RR |
1697 | } |
1698 | ||
bc6f2a75 Y |
1699 | static void module_remove_modinfo_attrs(struct module *mod, int end); |
1700 | ||
6407ebb2 | 1701 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1702 | { |
1703 | struct module_attribute *attr; | |
03e88ae1 | 1704 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1705 | int error = 0; |
1706 | int i; | |
1707 | ||
03e88ae1 GKH |
1708 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1709 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1710 | GFP_KERNEL); | |
1711 | if (!mod->modinfo_attrs) | |
1712 | return -ENOMEM; | |
1713 | ||
1714 | temp_attr = mod->modinfo_attrs; | |
bc6f2a75 | 1715 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
c75b590d | 1716 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1717 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1718 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1719 | error = sysfs_create_file(&mod->mkobj.kobj, |
1720 | &temp_attr->attr); | |
bc6f2a75 Y |
1721 | if (error) |
1722 | goto error_out; | |
03e88ae1 GKH |
1723 | ++temp_attr; |
1724 | } | |
c988d2b2 | 1725 | } |
bc6f2a75 Y |
1726 | |
1727 | return 0; | |
1728 | ||
1729 | error_out: | |
1730 | if (i > 0) | |
1731 | module_remove_modinfo_attrs(mod, --i); | |
c988d2b2 MD |
1732 | return error; |
1733 | } | |
1734 | ||
bc6f2a75 | 1735 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
c988d2b2 MD |
1736 | { |
1737 | struct module_attribute *attr; | |
1738 | int i; | |
1739 | ||
03e88ae1 | 1740 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
bc6f2a75 Y |
1741 | if (end >= 0 && i > end) |
1742 | break; | |
03e88ae1 GKH |
1743 | /* pick a field to test for end of list */ |
1744 | if (!attr->attr.name) | |
1745 | break; | |
6da0b565 | 1746 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1747 | if (attr->free) |
1748 | attr->free(mod); | |
c988d2b2 | 1749 | } |
03e88ae1 | 1750 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1751 | } |
1da177e4 | 1752 | |
942e4431 LZ |
1753 | static void mod_kobject_put(struct module *mod) |
1754 | { | |
1755 | DECLARE_COMPLETION_ONSTACK(c); | |
1756 | mod->mkobj.kobj_completion = &c; | |
1757 | kobject_put(&mod->mkobj.kobj); | |
1758 | wait_for_completion(&c); | |
1759 | } | |
1760 | ||
6407ebb2 | 1761 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1762 | { |
1763 | int err; | |
6494a93d | 1764 | struct kobject *kobj; |
1da177e4 | 1765 | |
823bccfc | 1766 | if (!module_sysfs_initialized) { |
bddb12b3 | 1767 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1768 | err = -EINVAL; |
1769 | goto out; | |
1770 | } | |
6494a93d GKH |
1771 | |
1772 | kobj = kset_find_obj(module_kset, mod->name); | |
1773 | if (kobj) { | |
bddb12b3 | 1774 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1775 | kobject_put(kobj); |
1776 | err = -EINVAL; | |
1777 | goto out; | |
1778 | } | |
1779 | ||
1da177e4 | 1780 | mod->mkobj.mod = mod; |
e17e0f51 | 1781 | |
ac3c8141 GKH |
1782 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1783 | mod->mkobj.kobj.kset = module_kset; | |
1784 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1785 | "%s", mod->name); | |
1786 | if (err) | |
942e4431 | 1787 | mod_kobject_put(mod); |
270a6c4c | 1788 | |
97c146ef | 1789 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1790 | out: |
1791 | return err; | |
1792 | } | |
1793 | ||
6407ebb2 | 1794 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1795 | const struct load_info *info, |
270a6c4c KS |
1796 | struct kernel_param *kparam, |
1797 | unsigned int num_params) | |
1798 | { | |
1799 | int err; | |
1800 | ||
80a3d1bb RR |
1801 | err = mod_sysfs_init(mod); |
1802 | if (err) | |
1803 | goto out; | |
1804 | ||
4ff6abff | 1805 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1806 | if (!mod->holders_dir) { |
1807 | err = -ENOMEM; | |
270a6c4c | 1808 | goto out_unreg; |
240936e1 | 1809 | } |
270a6c4c | 1810 | |
1da177e4 LT |
1811 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1812 | if (err) | |
270a6c4c | 1813 | goto out_unreg_holders; |
1da177e4 | 1814 | |
c988d2b2 MD |
1815 | err = module_add_modinfo_attrs(mod); |
1816 | if (err) | |
e17e0f51 | 1817 | goto out_unreg_param; |
c988d2b2 | 1818 | |
1ba5c08b CL |
1819 | err = add_usage_links(mod); |
1820 | if (err) | |
1821 | goto out_unreg_modinfo_attrs; | |
1822 | ||
8f6d0378 RR |
1823 | add_sect_attrs(mod, info); |
1824 | add_notes_attrs(mod, info); | |
80a3d1bb | 1825 | |
e17e0f51 | 1826 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1827 | return 0; |
1828 | ||
1ba5c08b | 1829 | out_unreg_modinfo_attrs: |
bc6f2a75 | 1830 | module_remove_modinfo_attrs(mod, -1); |
e17e0f51 KS |
1831 | out_unreg_param: |
1832 | module_param_sysfs_remove(mod); | |
270a6c4c | 1833 | out_unreg_holders: |
78a2d906 | 1834 | kobject_put(mod->holders_dir); |
270a6c4c | 1835 | out_unreg: |
942e4431 | 1836 | mod_kobject_put(mod); |
80a3d1bb | 1837 | out: |
1da177e4 LT |
1838 | return err; |
1839 | } | |
34e4e2fe DL |
1840 | |
1841 | static void mod_sysfs_fini(struct module *mod) | |
1842 | { | |
8f6d0378 RR |
1843 | remove_notes_attrs(mod); |
1844 | remove_sect_attrs(mod); | |
942e4431 | 1845 | mod_kobject_put(mod); |
34e4e2fe DL |
1846 | } |
1847 | ||
cf2fde7b RR |
1848 | static void init_param_lock(struct module *mod) |
1849 | { | |
1850 | mutex_init(&mod->param_lock); | |
1851 | } | |
8f6d0378 | 1852 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1853 | |
8f6d0378 RR |
1854 | static int mod_sysfs_setup(struct module *mod, |
1855 | const struct load_info *info, | |
6407ebb2 RR |
1856 | struct kernel_param *kparam, |
1857 | unsigned int num_params) | |
1858 | { | |
1859 | return 0; | |
1860 | } | |
1861 | ||
34e4e2fe DL |
1862 | static void mod_sysfs_fini(struct module *mod) |
1863 | { | |
1864 | } | |
1865 | ||
bc6f2a75 | 1866 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
36b0360d RR |
1867 | { |
1868 | } | |
1869 | ||
80a3d1bb RR |
1870 | static void del_usage_links(struct module *mod) |
1871 | { | |
1872 | } | |
1873 | ||
cf2fde7b RR |
1874 | static void init_param_lock(struct module *mod) |
1875 | { | |
1876 | } | |
34e4e2fe | 1877 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1878 | |
36b0360d | 1879 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1880 | { |
80a3d1bb | 1881 | del_usage_links(mod); |
bc6f2a75 | 1882 | module_remove_modinfo_attrs(mod, -1); |
1da177e4 | 1883 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1884 | kobject_put(mod->mkobj.drivers_dir); |
1885 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1886 | mod_sysfs_fini(mod); |
1da177e4 LT |
1887 | } |
1888 | ||
93651f80 | 1889 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb | 1890 | /* |
1891 | * LKM RO/NX protection: protect module's text/ro-data | |
1892 | * from modification and any data from execution. | |
85c898db RR |
1893 | * |
1894 | * General layout of module is: | |
444d13ff JY |
1895 | * [text] [read-only-data] [ro-after-init] [writable data] |
1896 | * text_size -----^ ^ ^ ^ | |
1897 | * ro_size ------------------------| | | | |
1898 | * ro_after_init_size -----------------------------| | | |
1899 | * size -----------------------------------------------------------| | |
85c898db RR |
1900 | * |
1901 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1902 | */ |
85c898db RR |
1903 | static void frob_text(const struct module_layout *layout, |
1904 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1905 | { |
85c898db RR |
1906 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1907 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1908 | set_memory((unsigned long)layout->base, | |
1909 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1910 | } |
84e1c6bb | 1911 | |
93651f80 | 1912 | #ifdef CONFIG_STRICT_MODULE_RWX |
85c898db RR |
1913 | static void frob_rodata(const struct module_layout *layout, |
1914 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1915 | { |
85c898db RR |
1916 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1917 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1918 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1919 | set_memory((unsigned long)layout->base + layout->text_size, | |
1920 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb | 1921 | } |
1922 | ||
444d13ff JY |
1923 | static void frob_ro_after_init(const struct module_layout *layout, |
1924 | int (*set_memory)(unsigned long start, int num_pages)) | |
1925 | { | |
1926 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1927 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1928 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1929 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1930 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1931 | } | |
1932 | ||
85c898db RR |
1933 | static void frob_writable_data(const struct module_layout *layout, |
1934 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1935 | { |
85c898db | 1936 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1937 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1938 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1939 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1940 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1941 | } |
84e1c6bb | 1942 | |
85c898db RR |
1943 | /* livepatching wants to disable read-only so it can frob module. */ |
1944 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1945 | { |
39290b38 AT |
1946 | if (!rodata_enabled) |
1947 | return; | |
1948 | ||
85c898db RR |
1949 | frob_text(&mod->core_layout, set_memory_rw); |
1950 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 1951 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
1952 | frob_text(&mod->init_layout, set_memory_rw); |
1953 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1954 | } |
84e1c6bb | 1955 | |
444d13ff | 1956 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 1957 | { |
39290b38 AT |
1958 | if (!rodata_enabled) |
1959 | return; | |
1960 | ||
1a7b7d92 RE |
1961 | set_vm_flush_reset_perms(mod->core_layout.base); |
1962 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 1963 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 1964 | |
85c898db RR |
1965 | frob_rodata(&mod->core_layout, set_memory_ro); |
1966 | frob_text(&mod->init_layout, set_memory_ro); | |
1967 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
1968 | |
1969 | if (after_init) | |
1970 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb | 1971 | } |
1972 | ||
85c898db | 1973 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 1974 | { |
85c898db | 1975 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 1976 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
1977 | frob_writable_data(&mod->core_layout, set_memory_nx); |
1978 | frob_rodata(&mod->init_layout, set_memory_nx); | |
1979 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
1980 | } |
1981 | ||
84e1c6bb | 1982 | /* Iterate through all modules and set each module's text as RW */ |
5d05c708 | 1983 | void set_all_modules_text_rw(void) |
84e1c6bb | 1984 | { |
1985 | struct module *mod; | |
1986 | ||
39290b38 AT |
1987 | if (!rodata_enabled) |
1988 | return; | |
1989 | ||
84e1c6bb | 1990 | mutex_lock(&module_mutex); |
1991 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1992 | if (mod->state == MODULE_STATE_UNFORMED) |
1993 | continue; | |
85c898db RR |
1994 | |
1995 | frob_text(&mod->core_layout, set_memory_rw); | |
1996 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb | 1997 | } |
1998 | mutex_unlock(&module_mutex); | |
1999 | } | |
2000 | ||
2001 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 2002 | void set_all_modules_text_ro(void) |
84e1c6bb | 2003 | { |
2004 | struct module *mod; | |
2005 | ||
39290b38 AT |
2006 | if (!rodata_enabled) |
2007 | return; | |
2008 | ||
84e1c6bb | 2009 | mutex_lock(&module_mutex); |
2010 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
2011 | /* |
2012 | * Ignore going modules since it's possible that ro | |
2013 | * protection has already been disabled, otherwise we'll | |
2014 | * run into protection faults at module deallocation. | |
2015 | */ | |
2016 | if (mod->state == MODULE_STATE_UNFORMED || | |
2017 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 2018 | continue; |
85c898db RR |
2019 | |
2020 | frob_text(&mod->core_layout, set_memory_ro); | |
2021 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb | 2022 | } |
2023 | mutex_unlock(&module_mutex); | |
2024 | } | |
93651f80 | 2025 | #else /* !CONFIG_STRICT_MODULE_RWX */ |
85c898db | 2026 | static void module_enable_nx(const struct module *mod) { } |
93651f80 | 2027 | #endif /* CONFIG_STRICT_MODULE_RWX */ |
2eef1399 YY |
2028 | static void module_enable_x(const struct module *mod) |
2029 | { | |
2030 | frob_text(&mod->core_layout, set_memory_x); | |
2031 | frob_text(&mod->init_layout, set_memory_x); | |
2032 | } | |
93651f80 YY |
2033 | #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ |
2034 | static void module_enable_nx(const struct module *mod) { } | |
2035 | static void module_enable_x(const struct module *mod) { } | |
2036 | #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
2037 | ||
84e1c6bb | 2038 | |
1ce15ef4 JY |
2039 | #ifdef CONFIG_LIVEPATCH |
2040 | /* | |
2041 | * Persist Elf information about a module. Copy the Elf header, | |
2042 | * section header table, section string table, and symtab section | |
2043 | * index from info to mod->klp_info. | |
2044 | */ | |
2045 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2046 | { | |
2047 | unsigned int size, symndx; | |
2048 | int ret; | |
2049 | ||
2050 | size = sizeof(*mod->klp_info); | |
2051 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2052 | if (mod->klp_info == NULL) | |
2053 | return -ENOMEM; | |
2054 | ||
2055 | /* Elf header */ | |
2056 | size = sizeof(mod->klp_info->hdr); | |
2057 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2058 | ||
2059 | /* Elf section header table */ | |
2060 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2061 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2062 | if (mod->klp_info->sechdrs == NULL) { |
2063 | ret = -ENOMEM; | |
2064 | goto free_info; | |
2065 | } | |
1ce15ef4 JY |
2066 | |
2067 | /* Elf section name string table */ | |
2068 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2069 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2070 | if (mod->klp_info->secstrings == NULL) { |
2071 | ret = -ENOMEM; | |
2072 | goto free_sechdrs; | |
2073 | } | |
1ce15ef4 JY |
2074 | |
2075 | /* Elf symbol section index */ | |
2076 | symndx = info->index.sym; | |
2077 | mod->klp_info->symndx = symndx; | |
2078 | ||
2079 | /* | |
2080 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2081 | * copy of the original symbol table. Adjust sh_addr to point | |
2082 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2083 | * init memory is freed at the end of do_init_module(). | |
2084 | */ | |
2085 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2086 | (unsigned long) mod->core_kallsyms.symtab; | |
2087 | ||
2088 | return 0; | |
2089 | ||
2090 | free_sechdrs: | |
2091 | kfree(mod->klp_info->sechdrs); | |
2092 | free_info: | |
2093 | kfree(mod->klp_info); | |
2094 | return ret; | |
2095 | } | |
2096 | ||
2097 | static void free_module_elf(struct module *mod) | |
2098 | { | |
2099 | kfree(mod->klp_info->sechdrs); | |
2100 | kfree(mod->klp_info->secstrings); | |
2101 | kfree(mod->klp_info); | |
2102 | } | |
2103 | #else /* !CONFIG_LIVEPATCH */ | |
2104 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2105 | { | |
2106 | return 0; | |
2107 | } | |
2108 | ||
2109 | static void free_module_elf(struct module *mod) | |
2110 | { | |
2111 | } | |
2112 | #endif /* CONFIG_LIVEPATCH */ | |
2113 | ||
be1f221c | 2114 | void __weak module_memfree(void *module_region) |
74e08fcf | 2115 | { |
1a7b7d92 RE |
2116 | /* |
2117 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2118 | * supported by vmalloc. | |
2119 | */ | |
2120 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2121 | vfree(module_region); |
2122 | } | |
2123 | ||
2124 | void __weak module_arch_cleanup(struct module *mod) | |
2125 | { | |
2126 | } | |
2127 | ||
d453cded RR |
2128 | void __weak module_arch_freeing_init(struct module *mod) |
2129 | { | |
2130 | } | |
2131 | ||
75676500 | 2132 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2133 | static void free_module(struct module *mod) |
2134 | { | |
7ead8b83 LZ |
2135 | trace_module_free(mod); |
2136 | ||
36b0360d | 2137 | mod_sysfs_teardown(mod); |
1da177e4 | 2138 | |
944a1fa0 RR |
2139 | /* We leave it in list to prevent duplicate loads, but make sure |
2140 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2141 | mutex_lock(&module_mutex); |
944a1fa0 | 2142 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2143 | mutex_unlock(&module_mutex); |
944a1fa0 | 2144 | |
b82bab4b JB |
2145 | /* Remove dynamic debug info */ |
2146 | ddebug_remove_module(mod->name); | |
2147 | ||
1da177e4 LT |
2148 | /* Arch-specific cleanup. */ |
2149 | module_arch_cleanup(mod); | |
2150 | ||
2151 | /* Module unload stuff */ | |
2152 | module_unload_free(mod); | |
2153 | ||
e180a6b7 RR |
2154 | /* Free any allocated parameters. */ |
2155 | destroy_params(mod->kp, mod->num_kp); | |
2156 | ||
1ce15ef4 JY |
2157 | if (is_livepatch_module(mod)) |
2158 | free_module_elf(mod); | |
2159 | ||
944a1fa0 RR |
2160 | /* Now we can delete it from the lists */ |
2161 | mutex_lock(&module_mutex); | |
461e34ae MH |
2162 | /* Unlink carefully: kallsyms could be walking list. */ |
2163 | list_del_rcu(&mod->list); | |
93c2e105 | 2164 | mod_tree_remove(mod); |
0286b5ea | 2165 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2166 | module_bug_cleanup(mod); |
0be964be | 2167 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2168 | synchronize_rcu(); |
944a1fa0 RR |
2169 | mutex_unlock(&module_mutex); |
2170 | ||
85c898db | 2171 | /* This may be empty, but that's OK */ |
d453cded | 2172 | module_arch_freeing_init(mod); |
7523e4dc | 2173 | module_memfree(mod->init_layout.base); |
1da177e4 | 2174 | kfree(mod->args); |
259354de | 2175 | percpu_modfree(mod); |
9f85a4bb | 2176 | |
35a9393c | 2177 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2178 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2179 | |
1da177e4 | 2180 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2181 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2182 | } |
2183 | ||
2184 | void *__symbol_get(const char *symbol) | |
2185 | { | |
2186 | struct module *owner; | |
414fd31b | 2187 | const struct kernel_symbol *sym; |
1da177e4 | 2188 | |
24da1cbf | 2189 | preempt_disable(); |
414fd31b TA |
2190 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2191 | if (sym && strong_try_module_get(owner)) | |
2192 | sym = NULL; | |
24da1cbf | 2193 | preempt_enable(); |
1da177e4 | 2194 | |
7290d580 | 2195 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2196 | } |
2197 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2198 | ||
eea8b54d AN |
2199 | /* |
2200 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2201 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2202 | * |
2203 | * You must hold the module_mutex. | |
eea8b54d | 2204 | */ |
2d25bc55 | 2205 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2206 | { |
b211104d | 2207 | unsigned int i; |
eea8b54d | 2208 | struct module *owner; |
b211104d RR |
2209 | const struct kernel_symbol *s; |
2210 | struct { | |
2211 | const struct kernel_symbol *sym; | |
2212 | unsigned int num; | |
2213 | } arr[] = { | |
2214 | { mod->syms, mod->num_syms }, | |
2215 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2216 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2217 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2218 | { mod->unused_syms, mod->num_unused_syms }, |
2219 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2220 | #endif |
b211104d | 2221 | }; |
eea8b54d | 2222 | |
b211104d RR |
2223 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2224 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 AB |
2225 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
2226 | true, false)) { | |
bddb12b3 | 2227 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2228 | " (owned by %s)\n", |
7290d580 AB |
2229 | mod->name, kernel_symbol_name(s), |
2230 | module_name(owner)); | |
b211104d RR |
2231 | return -ENOEXEC; |
2232 | } | |
eea8b54d | 2233 | } |
b211104d RR |
2234 | } |
2235 | return 0; | |
eea8b54d AN |
2236 | } |
2237 | ||
9a4b9708 | 2238 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2239 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2240 | { | |
2241 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2242 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2243 | unsigned long secbase; |
49668688 | 2244 | unsigned int i; |
1da177e4 | 2245 | int ret = 0; |
414fd31b | 2246 | const struct kernel_symbol *ksym; |
1da177e4 | 2247 | |
49668688 RR |
2248 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2249 | const char *name = info->strtab + sym[i].st_name; | |
2250 | ||
1da177e4 LT |
2251 | switch (sym[i].st_shndx) { |
2252 | case SHN_COMMON: | |
80375980 JM |
2253 | /* Ignore common symbols */ |
2254 | if (!strncmp(name, "__gnu_lto", 9)) | |
2255 | break; | |
2256 | ||
1da177e4 LT |
2257 | /* We compiled with -fno-common. These are not |
2258 | supposed to happen. */ | |
5e124169 | 2259 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2260 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2261 | mod->name); |
2262 | ret = -ENOEXEC; | |
2263 | break; | |
2264 | ||
2265 | case SHN_ABS: | |
2266 | /* Don't need to do anything */ | |
5e124169 | 2267 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2268 | (long)sym[i].st_value); |
2269 | break; | |
2270 | ||
1ce15ef4 JY |
2271 | case SHN_LIVEPATCH: |
2272 | /* Livepatch symbols are resolved by livepatch */ | |
2273 | break; | |
2274 | ||
1da177e4 | 2275 | case SHN_UNDEF: |
49668688 | 2276 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2277 | /* Ok if resolved. */ |
9bea7f23 | 2278 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2279 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2280 | break; |
414fd31b TA |
2281 | } |
2282 | ||
1da177e4 | 2283 | /* Ok if weak. */ |
9bea7f23 | 2284 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2285 | break; |
2286 | ||
9bea7f23 | 2287 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2288 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2289 | mod->name, name, ret); | |
1da177e4 LT |
2290 | break; |
2291 | ||
2292 | default: | |
2293 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2294 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2295 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2296 | else |
49668688 | 2297 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2298 | sym[i].st_value += secbase; |
2299 | break; | |
2300 | } | |
2301 | } | |
2302 | ||
2303 | return ret; | |
2304 | } | |
2305 | ||
49668688 | 2306 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2307 | { |
2308 | unsigned int i; | |
2309 | int err = 0; | |
2310 | ||
2311 | /* Now do relocations. */ | |
49668688 RR |
2312 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2313 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2314 | |
2315 | /* Not a valid relocation section? */ | |
49668688 | 2316 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2317 | continue; |
2318 | ||
2319 | /* Don't bother with non-allocated sections */ | |
49668688 | 2320 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2321 | continue; |
2322 | ||
1ce15ef4 JY |
2323 | /* Livepatch relocation sections are applied by livepatch */ |
2324 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2325 | continue; | |
2326 | ||
49668688 RR |
2327 | if (info->sechdrs[i].sh_type == SHT_REL) |
2328 | err = apply_relocate(info->sechdrs, info->strtab, | |
2329 | info->index.sym, i, mod); | |
2330 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2331 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2332 | info->index.sym, i, mod); | |
22e268eb RR |
2333 | if (err < 0) |
2334 | break; | |
2335 | } | |
2336 | return err; | |
2337 | } | |
2338 | ||
088af9a6 HD |
2339 | /* Additional bytes needed by arch in front of individual sections */ |
2340 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2341 | unsigned int section) | |
2342 | { | |
2343 | /* default implementation just returns zero */ | |
2344 | return 0; | |
2345 | } | |
2346 | ||
1da177e4 | 2347 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2348 | static long get_offset(struct module *mod, unsigned int *size, |
2349 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2350 | { |
2351 | long ret; | |
2352 | ||
088af9a6 | 2353 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2354 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2355 | *size = ret + sechdr->sh_size; | |
2356 | return ret; | |
2357 | } | |
2358 | ||
2359 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2360 | might -- code, read-only data, read-write data, small data. Tally | |
2361 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2362 | belongs in init. */ | |
49668688 | 2363 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2364 | { |
2365 | static unsigned long const masks[][2] = { | |
2366 | /* NOTE: all executable code must be the first section | |
2367 | * in this array; otherwise modify the text_size | |
2368 | * finder in the two loops below */ | |
2369 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2370 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2371 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2372 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2373 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2374 | }; | |
2375 | unsigned int m, i; | |
2376 | ||
49668688 RR |
2377 | for (i = 0; i < info->hdr->e_shnum; i++) |
2378 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2379 | |
5e124169 | 2380 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2381 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2382 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2383 | Elf_Shdr *s = &info->sechdrs[i]; | |
2384 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2385 | |
2386 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2387 | || (s->sh_flags & masks[m][1]) | |
2388 | || s->sh_entsize != ~0UL | |
49668688 | 2389 | || strstarts(sname, ".init")) |
1da177e4 | 2390 | continue; |
7523e4dc | 2391 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2392 | pr_debug("\t%s\n", sname); |
1da177e4 | 2393 | } |
84e1c6bb | 2394 | switch (m) { |
2395 | case 0: /* executable */ | |
7523e4dc RR |
2396 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2397 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb | 2398 | break; |
2399 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2400 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2401 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2402 | break; |
444d13ff JY |
2403 | case 2: /* RO after init */ |
2404 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2405 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2406 | break; | |
2407 | case 4: /* whole core */ | |
7523e4dc | 2408 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb | 2409 | break; |
2410 | } | |
1da177e4 LT |
2411 | } |
2412 | ||
5e124169 | 2413 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2414 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2415 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2416 | Elf_Shdr *s = &info->sechdrs[i]; | |
2417 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2418 | |
2419 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2420 | || (s->sh_flags & masks[m][1]) | |
2421 | || s->sh_entsize != ~0UL | |
49668688 | 2422 | || !strstarts(sname, ".init")) |
1da177e4 | 2423 | continue; |
7523e4dc | 2424 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2425 | | INIT_OFFSET_MASK); |
5e124169 | 2426 | pr_debug("\t%s\n", sname); |
1da177e4 | 2427 | } |
84e1c6bb | 2428 | switch (m) { |
2429 | case 0: /* executable */ | |
7523e4dc RR |
2430 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2431 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb | 2432 | break; |
2433 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2434 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2435 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2436 | break; |
444d13ff JY |
2437 | case 2: |
2438 | /* | |
2439 | * RO after init doesn't apply to init_layout (only | |
2440 | * core_layout), so it just takes the value of ro_size. | |
2441 | */ | |
2442 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2443 | break; | |
2444 | case 4: /* whole init */ | |
7523e4dc | 2445 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb | 2446 | break; |
2447 | } | |
1da177e4 LT |
2448 | } |
2449 | } | |
2450 | ||
1da177e4 LT |
2451 | static void set_license(struct module *mod, const char *license) |
2452 | { | |
2453 | if (!license) | |
2454 | license = "unspecified"; | |
2455 | ||
fa3ba2e8 | 2456 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2457 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2458 | pr_warn("%s: module license '%s' taints kernel.\n", |
2459 | mod->name, license); | |
373d4d09 RR |
2460 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2461 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2462 | } |
2463 | } | |
2464 | ||
2465 | /* Parse tag=value strings from .modinfo section */ | |
2466 | static char *next_string(char *string, unsigned long *secsize) | |
2467 | { | |
2468 | /* Skip non-zero chars */ | |
2469 | while (string[0]) { | |
2470 | string++; | |
2471 | if ((*secsize)-- <= 1) | |
2472 | return NULL; | |
2473 | } | |
2474 | ||
2475 | /* Skip any zero padding. */ | |
2476 | while (!string[0]) { | |
2477 | string++; | |
2478 | if ((*secsize)-- <= 1) | |
2479 | return NULL; | |
2480 | } | |
2481 | return string; | |
2482 | } | |
2483 | ||
49668688 | 2484 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2485 | { |
2486 | char *p; | |
2487 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2488 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2489 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2490 | |
5fdc7db6 JY |
2491 | /* |
2492 | * get_modinfo() calls made before rewrite_section_headers() | |
2493 | * must use sh_offset, as sh_addr isn't set! | |
2494 | */ | |
2495 | for (p = (char *)info->hdr + infosec->sh_offset; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2496 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2497 | return p + taglen + 1; | |
2498 | } | |
2499 | return NULL; | |
2500 | } | |
2501 | ||
49668688 | 2502 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2503 | { |
2504 | struct module_attribute *attr; | |
2505 | int i; | |
2506 | ||
2507 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2508 | if (attr->setup) | |
49668688 | 2509 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2510 | } |
2511 | } | |
c988d2b2 | 2512 | |
a263f776 RR |
2513 | static void free_modinfo(struct module *mod) |
2514 | { | |
2515 | struct module_attribute *attr; | |
2516 | int i; | |
2517 | ||
2518 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2519 | if (attr->free) | |
2520 | attr->free(mod); | |
2521 | } | |
2522 | } | |
2523 | ||
1da177e4 | 2524 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2525 | |
2d25bc55 JY |
2526 | /* Lookup exported symbol in given range of kernel_symbols */ |
2527 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2528 | const struct kernel_symbol *start, | |
2529 | const struct kernel_symbol *stop) | |
15bba37d | 2530 | { |
9d63487f AIB |
2531 | return bsearch(name, start, stop - start, |
2532 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2533 | } |
2534 | ||
ca4787b7 TA |
2535 | static int is_exported(const char *name, unsigned long value, |
2536 | const struct module *mod) | |
1da177e4 | 2537 | { |
ca4787b7 TA |
2538 | const struct kernel_symbol *ks; |
2539 | if (!mod) | |
2d25bc55 | 2540 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2541 | else |
2d25bc55 JY |
2542 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2543 | ||
7290d580 | 2544 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2545 | } |
2546 | ||
2547 | /* As per nm */ | |
eded41c1 | 2548 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2549 | { |
eded41c1 RR |
2550 | const Elf_Shdr *sechdrs = info->sechdrs; |
2551 | ||
1da177e4 LT |
2552 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2553 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2554 | return 'v'; | |
2555 | else | |
2556 | return 'w'; | |
2557 | } | |
2558 | if (sym->st_shndx == SHN_UNDEF) | |
2559 | return 'U'; | |
e0224418 | 2560 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2561 | return 'a'; |
2562 | if (sym->st_shndx >= SHN_LORESERVE) | |
2563 | return '?'; | |
2564 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2565 | return 't'; | |
2566 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2567 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2568 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2569 | return 'r'; | |
2570 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2571 | return 'g'; | |
2572 | else | |
2573 | return 'd'; | |
2574 | } | |
2575 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2576 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2577 | return 's'; | |
2578 | else | |
2579 | return 'b'; | |
2580 | } | |
eded41c1 RR |
2581 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2582 | ".debug")) { | |
1da177e4 | 2583 | return 'n'; |
eded41c1 | 2584 | } |
1da177e4 LT |
2585 | return '?'; |
2586 | } | |
2587 | ||
4a496226 | 2588 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2589 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2590 | { |
2591 | const Elf_Shdr *sec; | |
2592 | ||
2593 | if (src->st_shndx == SHN_UNDEF | |
2594 | || src->st_shndx >= shnum | |
2595 | || !src->st_name) | |
2596 | return false; | |
2597 | ||
e0224418 MB |
2598 | #ifdef CONFIG_KALLSYMS_ALL |
2599 | if (src->st_shndx == pcpundx) | |
2600 | return true; | |
2601 | #endif | |
2602 | ||
4a496226 JB |
2603 | sec = sechdrs + src->st_shndx; |
2604 | if (!(sec->sh_flags & SHF_ALLOC) | |
2605 | #ifndef CONFIG_KALLSYMS_ALL | |
2606 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2607 | #endif | |
2608 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2609 | return false; | |
2610 | ||
2611 | return true; | |
2612 | } | |
2613 | ||
48fd1188 KC |
2614 | /* |
2615 | * We only allocate and copy the strings needed by the parts of symtab | |
2616 | * we keep. This is simple, but has the effect of making multiple | |
2617 | * copies of duplicates. We could be more sophisticated, see | |
2618 | * linux-kernel thread starting with | |
2619 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2620 | */ | |
49668688 | 2621 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2622 | { |
49668688 RR |
2623 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2624 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2625 | const Elf_Sym *src; |
54523ec7 | 2626 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2627 | |
2628 | /* Put symbol section at end of init part of module. */ | |
2629 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2630 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2631 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2632 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2633 | |
49668688 | 2634 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2635 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2636 | |
48fd1188 | 2637 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2638 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2639 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2640 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2641 | info->index.pcpu)) { | |
59ef28b1 | 2642 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2643 | ndst++; |
554bdfe5 | 2644 | } |
59ef28b1 | 2645 | } |
4a496226 JB |
2646 | |
2647 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2648 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2649 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2650 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2651 | info->core_typeoffs = mod->core_layout.size; |
2652 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2653 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2654 | |
554bdfe5 JB |
2655 | /* Put string table section at end of init part of module. */ |
2656 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2657 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2658 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2659 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2660 | |
2661 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2662 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2663 | __alignof__(struct mod_kallsyms)); | |
2664 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2665 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2666 | info->init_typeoffs = mod->init_layout.size; |
2667 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2668 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2669 | } |
2670 | ||
8244062e RR |
2671 | /* |
2672 | * We use the full symtab and strtab which layout_symtab arranged to | |
2673 | * be appended to the init section. Later we switch to the cut-down | |
2674 | * core-only ones. | |
2675 | */ | |
811d66a0 | 2676 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2677 | { |
4a496226 JB |
2678 | unsigned int i, ndst; |
2679 | const Elf_Sym *src; | |
2680 | Elf_Sym *dst; | |
554bdfe5 | 2681 | char *s; |
eded41c1 | 2682 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2683 | |
8244062e RR |
2684 | /* Set up to point into init section. */ |
2685 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2686 | ||
2687 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2688 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2689 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2690 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2691 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2692 | |
1c7651f4 EL |
2693 | /* |
2694 | * Now populate the cut down core kallsyms for after init | |
2695 | * and set types up while we still have access to sections. | |
2696 | */ | |
8244062e RR |
2697 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2698 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2699 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2700 | src = mod->kallsyms->symtab; |
2701 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2702 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2703 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2704 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2705 | info->index.pcpu)) { | |
1c7651f4 EL |
2706 | mod->core_kallsyms.typetab[ndst] = |
2707 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2708 | dst[ndst] = src[i]; |
8244062e RR |
2709 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2710 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2711 | KSYM_NAME_LEN) + 1; |
2712 | } | |
4a496226 | 2713 | } |
8244062e | 2714 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2715 | } |
2716 | #else | |
49668688 | 2717 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2718 | { |
2719 | } | |
3ae91c21 | 2720 | |
abbce906 | 2721 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2722 | { |
2723 | } | |
2724 | #endif /* CONFIG_KALLSYMS */ | |
2725 | ||
52796312 | 2726 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2727 | { |
811d66a0 RR |
2728 | if (!debug) |
2729 | return; | |
513770f5 | 2730 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2731 | } |
346e15be | 2732 | |
52796312 | 2733 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2734 | { |
2735 | if (debug) | |
52796312 | 2736 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2737 | } |
2738 | ||
74e08fcf JB |
2739 | void * __weak module_alloc(unsigned long size) |
2740 | { | |
82fab442 | 2741 | return vmalloc_exec(size); |
74e08fcf JB |
2742 | } |
2743 | ||
38b37d63 MS |
2744 | bool __weak module_exit_section(const char *name) |
2745 | { | |
2746 | return strstarts(name, ".exit"); | |
2747 | } | |
2748 | ||
4f2294b6 | 2749 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2750 | static void kmemleak_load_module(const struct module *mod, |
2751 | const struct load_info *info) | |
4f2294b6 CM |
2752 | { |
2753 | unsigned int i; | |
2754 | ||
2755 | /* only scan the sections containing data */ | |
c017b4be | 2756 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2757 | |
49668688 | 2758 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2759 | /* Scan all writable sections that's not executable */ |
2760 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2761 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2762 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2763 | continue; |
2764 | ||
49668688 RR |
2765 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2766 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2767 | } |
2768 | } | |
2769 | #else | |
49668688 RR |
2770 | static inline void kmemleak_load_module(const struct module *mod, |
2771 | const struct load_info *info) | |
4f2294b6 CM |
2772 | { |
2773 | } | |
2774 | #endif | |
2775 | ||
106a4ee2 | 2776 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2777 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2778 | { |
2779 | int err = -ENOKEY; | |
34e1169d KC |
2780 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2781 | const void *mod = info->hdr; | |
caabe240 | 2782 | |
bca014ca BH |
2783 | /* |
2784 | * Require flags == 0, as a module with version information | |
2785 | * removed is no longer the module that was signed | |
2786 | */ | |
2787 | if (flags == 0 && | |
2788 | info->len > markerlen && | |
34e1169d | 2789 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2790 | /* We truncate the module to discard the signature */ |
34e1169d | 2791 | info->len -= markerlen; |
f314dfea | 2792 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2793 | } |
2794 | ||
2795 | if (!err) { | |
2796 | info->sig_ok = true; | |
2797 | return 0; | |
2798 | } | |
2799 | ||
2800 | /* Not having a signature is only an error if we're strict. */ | |
2c8fd268 | 2801 | if (err == -ENOKEY && !is_module_sig_enforced()) |
106a4ee2 RR |
2802 | err = 0; |
2803 | ||
2804 | return err; | |
2805 | } | |
2806 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2807 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2808 | { |
2809 | return 0; | |
2810 | } | |
2811 | #endif /* !CONFIG_MODULE_SIG */ | |
2812 | ||
34e1169d KC |
2813 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2814 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2815 | { |
34e1169d KC |
2816 | if (info->len < sizeof(*(info->hdr))) |
2817 | return -ENOEXEC; | |
2818 | ||
2819 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2820 | || info->hdr->e_type != ET_REL | |
2821 | || !elf_check_arch(info->hdr) | |
2822 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2823 | return -ENOEXEC; | |
2824 | ||
2825 | if (info->hdr->e_shoff >= info->len | |
2826 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2827 | info->len - info->hdr->e_shoff)) | |
2828 | return -ENOEXEC; | |
40dd2560 | 2829 | |
34e1169d KC |
2830 | return 0; |
2831 | } | |
2832 | ||
3afe9f84 LT |
2833 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2834 | ||
2835 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2836 | { | |
2837 | do { | |
2838 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2839 | ||
2840 | if (copy_from_user(dst, usrc, n) != 0) | |
2841 | return -EFAULT; | |
2842 | cond_resched(); | |
2843 | dst += n; | |
2844 | usrc += n; | |
2845 | len -= n; | |
2846 | } while (len); | |
2847 | return 0; | |
2848 | } | |
2849 | ||
1ce15ef4 | 2850 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2851 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2852 | { |
2992ef29 JP |
2853 | if (get_modinfo(info, "livepatch")) { |
2854 | mod->klp = true; | |
2855 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2856 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2857 | mod->name); | |
2992ef29 | 2858 | } |
1ce15ef4 JY |
2859 | |
2860 | return 0; | |
2861 | } | |
2862 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2863 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2864 | { |
2865 | if (get_modinfo(info, "livepatch")) { | |
2866 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2867 | mod->name); | |
2868 | return -ENOEXEC; | |
2869 | } | |
2870 | ||
2871 | return 0; | |
2872 | } | |
2873 | #endif /* CONFIG_LIVEPATCH */ | |
2874 | ||
caf7501a AK |
2875 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2876 | { | |
2877 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2878 | return; | |
2879 | ||
2880 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2881 | mod->name); | |
2882 | } | |
2883 | ||
34e1169d KC |
2884 | /* Sets info->hdr and info->len. */ |
2885 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2886 | struct load_info *info) | |
40dd2560 RR |
2887 | { |
2888 | int err; | |
40dd2560 | 2889 | |
34e1169d KC |
2890 | info->len = len; |
2891 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2892 | return -ENOEXEC; |
2893 | ||
c77b8cdf | 2894 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2895 | if (err) |
2896 | return err; | |
2897 | ||
40dd2560 | 2898 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2899 | info->hdr = __vmalloc(info->len, |
19809c2d | 2900 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2901 | if (!info->hdr) |
40dd2560 RR |
2902 | return -ENOMEM; |
2903 | ||
3afe9f84 | 2904 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2905 | vfree(info->hdr); |
2906 | return -EFAULT; | |
40dd2560 RR |
2907 | } |
2908 | ||
34e1169d KC |
2909 | return 0; |
2910 | } | |
2911 | ||
d913188c RR |
2912 | static void free_copy(struct load_info *info) |
2913 | { | |
d913188c RR |
2914 | vfree(info->hdr); |
2915 | } | |
2916 | ||
2f3238ae | 2917 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2918 | { |
2919 | unsigned int i; | |
2920 | ||
2921 | /* This should always be true, but let's be sure. */ | |
2922 | info->sechdrs[0].sh_addr = 0; | |
2923 | ||
2924 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2925 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2926 | if (shdr->sh_type != SHT_NOBITS | |
2927 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2928 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2929 | return -ENOEXEC; |
2930 | } | |
2931 | ||
2932 | /* Mark all sections sh_addr with their address in the | |
2933 | temporary image. */ | |
2934 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2935 | ||
2936 | #ifndef CONFIG_MODULE_UNLOAD | |
2937 | /* Don't load .exit sections */ | |
38b37d63 | 2938 | if (module_exit_section(info->secstrings+shdr->sh_name)) |
8b5f61a7 RR |
2939 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; |
2940 | #endif | |
8b5f61a7 | 2941 | } |
d6df72a0 RR |
2942 | |
2943 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 2944 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 2945 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 2946 | |
8b5f61a7 RR |
2947 | return 0; |
2948 | } | |
2949 | ||
3264d3f9 LT |
2950 | /* |
2951 | * Set up our basic convenience variables (pointers to section headers, | |
2952 | * search for module section index etc), and do some basic section | |
2953 | * verification. | |
2954 | * | |
81a0abd9 JY |
2955 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
2956 | * will be allocated in move_module(). | |
3264d3f9 | 2957 | */ |
81a0abd9 | 2958 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2959 | { |
2960 | unsigned int i; | |
3264d3f9 LT |
2961 | |
2962 | /* Set up the convenience variables */ | |
2963 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2964 | info->secstrings = (void *)info->hdr |
2965 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2966 | |
5fdc7db6 JY |
2967 | /* Try to find a name early so we can log errors with a module name */ |
2968 | info->index.info = find_sec(info, ".modinfo"); | |
2969 | if (!info->index.info) | |
2970 | info->name = "(missing .modinfo section)"; | |
2971 | else | |
2972 | info->name = get_modinfo(info, "name"); | |
3264d3f9 | 2973 | |
8b5f61a7 RR |
2974 | /* Find internal symbols and strings. */ |
2975 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2976 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2977 | info->index.sym = i; | |
2978 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2979 | info->strtab = (char *)info->hdr |
2980 | + info->sechdrs[info->index.str].sh_offset; | |
2981 | break; | |
3264d3f9 | 2982 | } |
3264d3f9 LT |
2983 | } |
2984 | ||
5fdc7db6 JY |
2985 | if (info->index.sym == 0) { |
2986 | pr_warn("%s: module has no symbols (stripped?)\n", info->name); | |
2987 | return -ENOEXEC; | |
2988 | } | |
2989 | ||
49668688 | 2990 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2991 | if (!info->index.mod) { |
3e2e857f KC |
2992 | pr_warn("%s: No module found in object\n", |
2993 | info->name ?: "(missing .modinfo name field)"); | |
81a0abd9 | 2994 | return -ENOEXEC; |
3264d3f9 LT |
2995 | } |
2996 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 2997 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 2998 | |
3e2e857f | 2999 | /* |
5fdc7db6 | 3000 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
3001 | * on-disk struct mod 'name' field. |
3002 | */ | |
3003 | if (!info->name) | |
81a0abd9 | 3004 | info->name = info->mod->name; |
3e2e857f | 3005 | |
5fdc7db6 JY |
3006 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
3007 | info->index.vers = 0; /* Pretend no __versions section! */ | |
3008 | else | |
3009 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 3010 | |
49668688 | 3011 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3012 | |
81a0abd9 | 3013 | return 0; |
3264d3f9 LT |
3014 | } |
3015 | ||
2f3238ae | 3016 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3017 | { |
49668688 | 3018 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3019 | int err; |
3020 | ||
2f3238ae RR |
3021 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3022 | modmagic = NULL; | |
3023 | ||
40dd2560 RR |
3024 | /* This is allowed: modprobe --force will invalidate it. */ |
3025 | if (!modmagic) { | |
3026 | err = try_to_force_load(mod, "bad vermagic"); | |
3027 | if (err) | |
3028 | return err; | |
49668688 | 3029 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3030 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3031 | info->name, modmagic, vermagic); |
40dd2560 RR |
3032 | return -ENOEXEC; |
3033 | } | |
3034 | ||
3205c36c LP |
3035 | if (!get_modinfo(info, "intree")) { |
3036 | if (!test_taint(TAINT_OOT_MODULE)) | |
3037 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3038 | mod->name); | |
373d4d09 | 3039 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3040 | } |
2449b8ba | 3041 | |
caf7501a AK |
3042 | check_modinfo_retpoline(mod, info); |
3043 | ||
49668688 | 3044 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3045 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3046 | pr_warn("%s: module is from the staging directory, the quality " |
3047 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3048 | } |
22e268eb | 3049 | |
2992ef29 | 3050 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3051 | if (err) |
3052 | return err; | |
3053 | ||
22e268eb | 3054 | /* Set up license info based on the info section */ |
49668688 | 3055 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3056 | |
40dd2560 RR |
3057 | return 0; |
3058 | } | |
3059 | ||
eb3057df | 3060 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3061 | { |
49668688 | 3062 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3063 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3064 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3065 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3066 | mod->crcs = section_addr(info, "__kcrctab"); |
3067 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3068 | sizeof(*mod->gpl_syms), |
3069 | &mod->num_gpl_syms); | |
49668688 RR |
3070 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3071 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3072 | "__ksymtab_gpl_future", |
3073 | sizeof(*mod->gpl_future_syms), | |
3074 | &mod->num_gpl_future_syms); | |
49668688 | 3075 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3076 | |
3077 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3078 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3079 | sizeof(*mod->unused_syms), |
3080 | &mod->num_unused_syms); | |
49668688 RR |
3081 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3082 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3083 | sizeof(*mod->unused_gpl_syms), |
3084 | &mod->num_unused_gpl_syms); | |
49668688 | 3085 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3086 | #endif |
3087 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3088 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3089 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3090 | if (!mod->ctors) |
3091 | mod->ctors = section_objs(info, ".init_array", | |
3092 | sizeof(*mod->ctors), &mod->num_ctors); | |
3093 | else if (find_sec(info, ".init_array")) { | |
3094 | /* | |
3095 | * This shouldn't happen with same compiler and binutils | |
3096 | * building all parts of the module. | |
3097 | */ | |
6da0b565 | 3098 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3099 | mod->name); |
3100 | return -EINVAL; | |
3101 | } | |
f91a13bb LT |
3102 | #endif |
3103 | ||
3104 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3105 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3106 | sizeof(*mod->tracepoints_ptrs), | |
3107 | &mod->num_tracepoints); | |
f91a13bb | 3108 | #endif |
fe15b50c PM |
3109 | #ifdef CONFIG_TREE_SRCU |
3110 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
3111 | sizeof(*mod->srcu_struct_ptrs), | |
3112 | &mod->num_srcu_structs); | |
3113 | #endif | |
a38d1107 MM |
3114 | #ifdef CONFIG_BPF_EVENTS |
3115 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3116 | sizeof(*mod->bpf_raw_events), | |
3117 | &mod->num_bpf_raw_events); | |
3118 | #endif | |
e9666d10 | 3119 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3120 | mod->jump_entries = section_objs(info, "__jump_table", |
3121 | sizeof(*mod->jump_entries), | |
3122 | &mod->num_jump_entries); | |
3123 | #endif | |
f91a13bb | 3124 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3125 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3126 | sizeof(*mod->trace_events), |
3127 | &mod->num_trace_events); | |
99be647c JL |
3128 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3129 | sizeof(*mod->trace_evals), | |
3130 | &mod->num_trace_evals); | |
f91a13bb | 3131 | #endif |
13b9b6e7 SR |
3132 | #ifdef CONFIG_TRACING |
3133 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3134 | sizeof(*mod->trace_bprintk_fmt_start), | |
3135 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3136 | #endif |
f91a13bb LT |
3137 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3138 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3139 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3140 | sizeof(*mod->ftrace_callsites), |
3141 | &mod->num_ftrace_callsites); | |
3142 | #endif | |
540adea3 MH |
3143 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3144 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3145 | sizeof(*mod->ei_funcs), | |
3146 | &mod->num_ei_funcs); | |
92ace999 | 3147 | #endif |
811d66a0 RR |
3148 | mod->extable = section_objs(info, "__ex_table", |
3149 | sizeof(*mod->extable), &mod->num_exentries); | |
3150 | ||
49668688 | 3151 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3152 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3153 | |
3154 | info->debug = section_objs(info, "__verbose", | |
3155 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3156 | |
3157 | return 0; | |
f91a13bb LT |
3158 | } |
3159 | ||
49668688 | 3160 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3161 | { |
3162 | int i; | |
3163 | void *ptr; | |
3164 | ||
3165 | /* Do the allocs. */ | |
7523e4dc | 3166 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3167 | /* |
3168 | * The pointer to this block is stored in the module structure | |
3169 | * which is inside the block. Just mark it as not being a | |
3170 | * leak. | |
3171 | */ | |
3172 | kmemleak_not_leak(ptr); | |
3173 | if (!ptr) | |
d913188c | 3174 | return -ENOMEM; |
65b8a9b4 | 3175 | |
7523e4dc RR |
3176 | memset(ptr, 0, mod->core_layout.size); |
3177 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3178 | |
7523e4dc RR |
3179 | if (mod->init_layout.size) { |
3180 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3181 | /* |
3182 | * The pointer to this block is stored in the module structure | |
3183 | * which is inside the block. This block doesn't need to be | |
3184 | * scanned as it contains data and code that will be freed | |
3185 | * after the module is initialized. | |
3186 | */ | |
3187 | kmemleak_ignore(ptr); | |
3188 | if (!ptr) { | |
7523e4dc | 3189 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3190 | return -ENOMEM; |
3191 | } | |
7523e4dc RR |
3192 | memset(ptr, 0, mod->init_layout.size); |
3193 | mod->init_layout.base = ptr; | |
82fab442 | 3194 | } else |
7523e4dc | 3195 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3196 | |
3197 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3198 | pr_debug("final section addresses:\n"); |
49668688 | 3199 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3200 | void *dest; |
49668688 | 3201 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3202 | |
49668688 | 3203 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3204 | continue; |
3205 | ||
49668688 | 3206 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3207 | dest = mod->init_layout.base |
49668688 | 3208 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3209 | else |
7523e4dc | 3210 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3211 | |
49668688 RR |
3212 | if (shdr->sh_type != SHT_NOBITS) |
3213 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3214 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3215 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3216 | pr_debug("\t0x%lx %s\n", |
3217 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3218 | } |
d913188c RR |
3219 | |
3220 | return 0; | |
65b8a9b4 LT |
3221 | } |
3222 | ||
49668688 | 3223 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3224 | { |
3205c36c LP |
3225 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3226 | ||
22e268eb RR |
3227 | /* |
3228 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3229 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3230 | * using GPL-only symbols it needs. | |
3231 | */ | |
3232 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3233 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3234 | |
3235 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3236 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3237 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3238 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3239 | |
c99af375 MG |
3240 | /* lve claims to be GPL but upstream won't provide source */ |
3241 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3242 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3243 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3244 | |
3205c36c LP |
3245 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3246 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3247 | ||
22e268eb RR |
3248 | #ifdef CONFIG_MODVERSIONS |
3249 | if ((mod->num_syms && !mod->crcs) | |
3250 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3251 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3252 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3253 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3254 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3255 | #endif | |
3256 | ) { | |
3257 | return try_to_force_load(mod, | |
3258 | "no versions for exported symbols"); | |
3259 | } | |
3260 | #endif | |
3261 | return 0; | |
3262 | } | |
3263 | ||
3264 | static void flush_module_icache(const struct module *mod) | |
3265 | { | |
3266 | mm_segment_t old_fs; | |
3267 | ||
3268 | /* flush the icache in correct context */ | |
3269 | old_fs = get_fs(); | |
3270 | set_fs(KERNEL_DS); | |
3271 | ||
3272 | /* | |
3273 | * Flush the instruction cache, since we've played with text. | |
3274 | * Do it before processing of module parameters, so the module | |
3275 | * can provide parameter accessor functions of its own. | |
3276 | */ | |
7523e4dc RR |
3277 | if (mod->init_layout.base) |
3278 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3279 | (unsigned long)mod->init_layout.base | |
3280 | + mod->init_layout.size); | |
3281 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3282 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3283 | |
3284 | set_fs(old_fs); | |
3285 | } | |
3286 | ||
74e08fcf JB |
3287 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3288 | Elf_Shdr *sechdrs, | |
3289 | char *secstrings, | |
3290 | struct module *mod) | |
3291 | { | |
3292 | return 0; | |
3293 | } | |
3294 | ||
be7de5f9 PB |
3295 | /* module_blacklist is a comma-separated list of module names */ |
3296 | static char *module_blacklist; | |
96b5b194 | 3297 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3298 | { |
3299 | const char *p; | |
3300 | size_t len; | |
3301 | ||
3302 | if (!module_blacklist) | |
3303 | return false; | |
3304 | ||
3305 | for (p = module_blacklist; *p; p += len) { | |
3306 | len = strcspn(p, ","); | |
3307 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3308 | return true; | |
3309 | if (p[len] == ',') | |
3310 | len++; | |
3311 | } | |
3312 | return false; | |
3313 | } | |
3314 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3315 | ||
2f3238ae | 3316 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3317 | { |
1da177e4 | 3318 | struct module *mod; |
444d13ff | 3319 | unsigned int ndx; |
d913188c | 3320 | int err; |
3ae91c21 | 3321 | |
81a0abd9 | 3322 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3323 | if (err) |
3324 | return ERR_PTR(err); | |
1da177e4 | 3325 | |
1da177e4 | 3326 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3327 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3328 | info->secstrings, info->mod); |
1da177e4 | 3329 | if (err < 0) |
8d8022e8 | 3330 | return ERR_PTR(err); |
1da177e4 | 3331 | |
8d8022e8 RR |
3332 | /* We will do a special allocation for per-cpu sections later. */ |
3333 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3334 | |
444d13ff JY |
3335 | /* |
3336 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3337 | * layout_sections() can put it in the right place. | |
3338 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3339 | */ | |
3340 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3341 | if (ndx) |
3342 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3343 | /* | |
3344 | * Mark the __jump_table section as ro_after_init as well: these data | |
3345 | * structures are never modified, with the exception of entries that | |
3346 | * refer to code in the __init section, which are annotated as such | |
3347 | * at module load time. | |
3348 | */ | |
3349 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3350 | if (ndx) |
3351 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3352 | ||
1da177e4 LT |
3353 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3354 | this is done generically; there doesn't appear to be any | |
3355 | special cases for the architectures. */ | |
81a0abd9 JY |
3356 | layout_sections(info->mod, info); |
3357 | layout_symtab(info->mod, info); | |
1da177e4 | 3358 | |
65b8a9b4 | 3359 | /* Allocate and move to the final place */ |
81a0abd9 | 3360 | err = move_module(info->mod, info); |
d913188c | 3361 | if (err) |
8d8022e8 | 3362 | return ERR_PTR(err); |
d913188c RR |
3363 | |
3364 | /* Module has been copied to its final place now: return it. */ | |
3365 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3366 | kmemleak_load_module(mod, info); |
d913188c | 3367 | return mod; |
d913188c RR |
3368 | } |
3369 | ||
3370 | /* mod is no longer valid after this! */ | |
3371 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3372 | { | |
d913188c | 3373 | percpu_modfree(mod); |
d453cded | 3374 | module_arch_freeing_init(mod); |
7523e4dc RR |
3375 | module_memfree(mod->init_layout.base); |
3376 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3377 | } |
3378 | ||
74e08fcf JB |
3379 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3380 | const Elf_Shdr *sechdrs, | |
3381 | struct module *me) | |
3382 | { | |
3383 | return 0; | |
3384 | } | |
3385 | ||
811d66a0 RR |
3386 | static int post_relocation(struct module *mod, const struct load_info *info) |
3387 | { | |
51f3d0f4 | 3388 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3389 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3390 | ||
3391 | /* Copy relocated percpu area over. */ | |
3392 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3393 | info->sechdrs[info->index.pcpu].sh_size); | |
3394 | ||
51f3d0f4 | 3395 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3396 | add_kallsyms(mod, info); |
3397 | ||
3398 | /* Arch-specific module finalizing. */ | |
3399 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3400 | } | |
3401 | ||
9bb9c3be RR |
3402 | /* Is this module of this name done loading? No locks held. */ |
3403 | static bool finished_loading(const char *name) | |
3404 | { | |
3405 | struct module *mod; | |
3406 | bool ret; | |
3407 | ||
9cc019b8 PZ |
3408 | /* |
3409 | * The module_mutex should not be a heavily contended lock; | |
3410 | * if we get the occasional sleep here, we'll go an extra iteration | |
3411 | * in the wait_event_interruptible(), which is harmless. | |
3412 | */ | |
3413 | sched_annotate_sleep(); | |
9bb9c3be | 3414 | mutex_lock(&module_mutex); |
4f6de4d5 | 3415 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 3416 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
3417 | mutex_unlock(&module_mutex); |
3418 | ||
3419 | return ret; | |
3420 | } | |
3421 | ||
34e1169d KC |
3422 | /* Call module constructors. */ |
3423 | static void do_mod_ctors(struct module *mod) | |
3424 | { | |
3425 | #ifdef CONFIG_CONSTRUCTORS | |
3426 | unsigned long i; | |
3427 | ||
3428 | for (i = 0; i < mod->num_ctors; i++) | |
3429 | mod->ctors[i](); | |
3430 | #endif | |
3431 | } | |
3432 | ||
c7496379 RR |
3433 | /* For freeing module_init on success, in case kallsyms traversing */ |
3434 | struct mod_initfree { | |
1a7b7d92 | 3435 | struct llist_node node; |
c7496379 RR |
3436 | void *module_init; |
3437 | }; | |
3438 | ||
1a7b7d92 | 3439 | static void do_free_init(struct work_struct *w) |
c7496379 | 3440 | { |
1a7b7d92 RE |
3441 | struct llist_node *pos, *n, *list; |
3442 | struct mod_initfree *initfree; | |
3443 | ||
3444 | list = llist_del_all(&init_free_list); | |
3445 | ||
3446 | synchronize_rcu(); | |
3447 | ||
3448 | llist_for_each_safe(pos, n, list) { | |
3449 | initfree = container_of(pos, struct mod_initfree, node); | |
3450 | module_memfree(initfree->module_init); | |
3451 | kfree(initfree); | |
3452 | } | |
c7496379 RR |
3453 | } |
3454 | ||
1a7b7d92 RE |
3455 | static int __init modules_wq_init(void) |
3456 | { | |
3457 | INIT_WORK(&init_free_wq, do_free_init); | |
3458 | init_llist_head(&init_free_list); | |
3459 | return 0; | |
3460 | } | |
3461 | module_init(modules_wq_init); | |
3462 | ||
be02a186 JK |
3463 | /* |
3464 | * This is where the real work happens. | |
3465 | * | |
3466 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3467 | * helper command 'lx-symbols'. | |
3468 | */ | |
3469 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3470 | { |
3471 | int ret = 0; | |
c7496379 RR |
3472 | struct mod_initfree *freeinit; |
3473 | ||
3474 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3475 | if (!freeinit) { | |
3476 | ret = -ENOMEM; | |
3477 | goto fail; | |
3478 | } | |
7523e4dc | 3479 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3480 | |
774a1221 TH |
3481 | /* |
3482 | * We want to find out whether @mod uses async during init. Clear | |
3483 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3484 | */ | |
3485 | current->flags &= ~PF_USED_ASYNC; | |
3486 | ||
34e1169d KC |
3487 | do_mod_ctors(mod); |
3488 | /* Start the module */ | |
3489 | if (mod->init != NULL) | |
3490 | ret = do_one_initcall(mod->init); | |
3491 | if (ret < 0) { | |
c7496379 | 3492 | goto fail_free_freeinit; |
34e1169d KC |
3493 | } |
3494 | if (ret > 0) { | |
bddb12b3 AM |
3495 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3496 | "follow 0/-E convention\n" | |
3497 | "%s: loading module anyway...\n", | |
3498 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3499 | dump_stack(); |
3500 | } | |
3501 | ||
3502 | /* Now it's a first class citizen! */ | |
3503 | mod->state = MODULE_STATE_LIVE; | |
3504 | blocking_notifier_call_chain(&module_notify_list, | |
3505 | MODULE_STATE_LIVE, mod); | |
3506 | ||
774a1221 TH |
3507 | /* |
3508 | * We need to finish all async code before the module init sequence | |
3509 | * is done. This has potential to deadlock. For example, a newly | |
3510 | * detected block device can trigger request_module() of the | |
3511 | * default iosched from async probing task. Once userland helper | |
3512 | * reaches here, async_synchronize_full() will wait on the async | |
3513 | * task waiting on request_module() and deadlock. | |
3514 | * | |
3515 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3516 | * iff module init queued any async jobs. This isn't a full | |
3517 | * solution as it will deadlock the same if module loading from | |
3518 | * async jobs nests more than once; however, due to the various | |
3519 | * constraints, this hack seems to be the best option for now. | |
3520 | * Please refer to the following thread for details. | |
3521 | * | |
3522 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3523 | */ | |
f2411da7 | 3524 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3525 | async_synchronize_full(); |
34e1169d | 3526 | |
aba4b5c2 | 3527 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3528 | mod->init_layout.size); |
34e1169d KC |
3529 | mutex_lock(&module_mutex); |
3530 | /* Drop initial reference. */ | |
3531 | module_put(mod); | |
3532 | trim_init_extable(mod); | |
3533 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3534 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3535 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3536 | #endif |
444d13ff | 3537 | module_enable_ro(mod, true); |
93c2e105 | 3538 | mod_tree_remove_init(mod); |
d453cded | 3539 | module_arch_freeing_init(mod); |
7523e4dc RR |
3540 | mod->init_layout.base = NULL; |
3541 | mod->init_layout.size = 0; | |
3542 | mod->init_layout.ro_size = 0; | |
444d13ff | 3543 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3544 | mod->init_layout.text_size = 0; |
c7496379 RR |
3545 | /* |
3546 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3547 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3548 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3549 | * path. module_memfree() cannot be called in an interrupt, so do the |
3550 | * work and call synchronize_rcu() in a work queue. | |
3551 | * | |
ae646f0b JH |
3552 | * Note that module_alloc() on most architectures creates W+X page |
3553 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3554 | * code such as mark_rodata_ro() which depends on those mappings to | |
3555 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3556 | * rcu_barrier() |
c7496379 | 3557 | */ |
1a7b7d92 RE |
3558 | if (llist_add(&freeinit->node, &init_free_list)) |
3559 | schedule_work(&init_free_wq); | |
3560 | ||
34e1169d KC |
3561 | mutex_unlock(&module_mutex); |
3562 | wake_up_all(&module_wq); | |
3563 | ||
3564 | return 0; | |
c7496379 RR |
3565 | |
3566 | fail_free_freeinit: | |
3567 | kfree(freeinit); | |
3568 | fail: | |
3569 | /* Try to protect us from buggy refcounters. */ | |
3570 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3571 | synchronize_rcu(); |
c7496379 RR |
3572 | module_put(mod); |
3573 | blocking_notifier_call_chain(&module_notify_list, | |
3574 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3575 | klp_module_going(mod); |
7dcd182b | 3576 | ftrace_release_mod(mod); |
c7496379 RR |
3577 | free_module(mod); |
3578 | wake_up_all(&module_wq); | |
3579 | return ret; | |
34e1169d KC |
3580 | } |
3581 | ||
3582 | static int may_init_module(void) | |
3583 | { | |
3584 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3585 | return -EPERM; | |
3586 | ||
3587 | return 0; | |
3588 | } | |
3589 | ||
a3535c7e RR |
3590 | /* |
3591 | * We try to place it in the list now to make sure it's unique before | |
3592 | * we dedicate too many resources. In particular, temporary percpu | |
3593 | * memory exhaustion. | |
3594 | */ | |
3595 | static int add_unformed_module(struct module *mod) | |
3596 | { | |
3597 | int err; | |
3598 | struct module *old; | |
3599 | ||
3600 | mod->state = MODULE_STATE_UNFORMED; | |
3601 | ||
3602 | again: | |
3603 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3604 | old = find_module_all(mod->name, strlen(mod->name), true); |
3605 | if (old != NULL) { | |
6e6de3de | 3606 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
3607 | /* Wait in case it fails to load. */ |
3608 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3609 | err = wait_event_interruptible(module_wq, |
3610 | finished_loading(mod->name)); | |
a3535c7e RR |
3611 | if (err) |
3612 | goto out_unlocked; | |
3613 | goto again; | |
3614 | } | |
3615 | err = -EEXIST; | |
3616 | goto out; | |
3617 | } | |
4f666546 | 3618 | mod_update_bounds(mod); |
a3535c7e | 3619 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3620 | mod_tree_insert(mod); |
a3535c7e RR |
3621 | err = 0; |
3622 | ||
3623 | out: | |
3624 | mutex_unlock(&module_mutex); | |
3625 | out_unlocked: | |
3626 | return err; | |
3627 | } | |
3628 | ||
3629 | static int complete_formation(struct module *mod, struct load_info *info) | |
3630 | { | |
3631 | int err; | |
3632 | ||
3633 | mutex_lock(&module_mutex); | |
3634 | ||
3635 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3636 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3637 | if (err < 0) |
3638 | goto out; | |
3639 | ||
3640 | /* This relies on module_mutex for list integrity. */ | |
3641 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3642 | ||
444d13ff | 3643 | module_enable_ro(mod, false); |
85c898db | 3644 | module_enable_nx(mod); |
2eef1399 | 3645 | module_enable_x(mod); |
4982223e | 3646 | |
a3535c7e RR |
3647 | /* Mark state as coming so strong_try_module_get() ignores us, |
3648 | * but kallsyms etc. can see us. */ | |
3649 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3650 | mutex_unlock(&module_mutex); |
3651 | ||
4982223e | 3652 | return 0; |
a3535c7e RR |
3653 | |
3654 | out: | |
3655 | mutex_unlock(&module_mutex); | |
3656 | return err; | |
3657 | } | |
3658 | ||
4c973d16 JY |
3659 | static int prepare_coming_module(struct module *mod) |
3660 | { | |
7e545d6e JY |
3661 | int err; |
3662 | ||
4c973d16 | 3663 | ftrace_module_enable(mod); |
7e545d6e JY |
3664 | err = klp_module_coming(mod); |
3665 | if (err) | |
3666 | return err; | |
3667 | ||
4c973d16 JY |
3668 | blocking_notifier_call_chain(&module_notify_list, |
3669 | MODULE_STATE_COMING, mod); | |
3670 | return 0; | |
3671 | } | |
3672 | ||
ecc86170 LR |
3673 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3674 | void *arg) | |
54041d8a | 3675 | { |
f2411da7 LR |
3676 | struct module *mod = arg; |
3677 | int ret; | |
3678 | ||
3679 | if (strcmp(param, "async_probe") == 0) { | |
3680 | mod->async_probe_requested = true; | |
3681 | return 0; | |
3682 | } | |
3683 | ||
6da0b565 | 3684 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3685 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3686 | if (ret != 0) |
3687 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3688 | return 0; |
3689 | } | |
3690 | ||
d913188c RR |
3691 | /* Allocate and load the module: note that size of section 0 is always |
3692 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3693 | static int load_module(struct load_info *info, const char __user *uargs, |
3694 | int flags) | |
d913188c | 3695 | { |
a3535c7e | 3696 | struct module *mod; |
5fdc7db6 | 3697 | long err = 0; |
51e158c1 | 3698 | char *after_dashes; |
d913188c | 3699 | |
5fdc7db6 JY |
3700 | err = elf_header_check(info); |
3701 | if (err) | |
3702 | goto free_copy; | |
3703 | ||
3704 | err = setup_load_info(info, flags); | |
3705 | if (err) | |
3706 | goto free_copy; | |
3707 | ||
3708 | if (blacklisted(info->name)) { | |
3709 | err = -EPERM; | |
3710 | goto free_copy; | |
3711 | } | |
3712 | ||
bca014ca | 3713 | err = module_sig_check(info, flags); |
34e1169d KC |
3714 | if (err) |
3715 | goto free_copy; | |
d913188c | 3716 | |
5fdc7db6 | 3717 | err = rewrite_section_headers(info, flags); |
d913188c | 3718 | if (err) |
34e1169d | 3719 | goto free_copy; |
d913188c | 3720 | |
5fdc7db6 JY |
3721 | /* Check module struct version now, before we try to use module. */ |
3722 | if (!check_modstruct_version(info, info->mod)) { | |
3723 | err = -ENOEXEC; | |
3724 | goto free_copy; | |
3725 | } | |
3726 | ||
d913188c | 3727 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3728 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3729 | if (IS_ERR(mod)) { |
3730 | err = PTR_ERR(mod); | |
d913188c | 3731 | goto free_copy; |
1da177e4 | 3732 | } |
1da177e4 | 3733 | |
ca86cad7 RGB |
3734 | audit_log_kern_module(mod->name); |
3735 | ||
a3535c7e RR |
3736 | /* Reserve our place in the list. */ |
3737 | err = add_unformed_module(mod); | |
3738 | if (err) | |
1fb9341a | 3739 | goto free_module; |
1fb9341a | 3740 | |
106a4ee2 | 3741 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3742 | mod->sig_ok = info->sig_ok; |
64748a2c | 3743 | if (!mod->sig_ok) { |
bddb12b3 | 3744 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3745 | "and/or required key missing - tainting " |
bddb12b3 | 3746 | "kernel\n", mod->name); |
66cc69e3 | 3747 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3748 | } |
106a4ee2 RR |
3749 | #endif |
3750 | ||
8d8022e8 | 3751 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3752 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3753 | if (err) |
3754 | goto unlink_mod; | |
3755 | ||
49668688 | 3756 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3757 | err = module_unload_init(mod); |
3758 | if (err) | |
1fb9341a | 3759 | goto unlink_mod; |
1da177e4 | 3760 | |
cf2fde7b | 3761 | init_param_lock(mod); |
b51d23e4 | 3762 | |
22e268eb RR |
3763 | /* Now we've got everything in the final locations, we can |
3764 | * find optional sections. */ | |
eb3057df FH |
3765 | err = find_module_sections(mod, info); |
3766 | if (err) | |
3767 | goto free_unload; | |
9b37ccfc | 3768 | |
49668688 | 3769 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3770 | if (err) |
3771 | goto free_unload; | |
9841d61d | 3772 | |
c988d2b2 | 3773 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3774 | setup_modinfo(mod, info); |
c988d2b2 | 3775 | |
1da177e4 | 3776 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3777 | err = simplify_symbols(mod, info); |
1da177e4 | 3778 | if (err < 0) |
d913188c | 3779 | goto free_modinfo; |
1da177e4 | 3780 | |
34e1169d | 3781 | err = apply_relocations(mod, info); |
22e268eb | 3782 | if (err < 0) |
d913188c | 3783 | goto free_modinfo; |
1da177e4 | 3784 | |
34e1169d | 3785 | err = post_relocation(mod, info); |
1da177e4 | 3786 | if (err < 0) |
d913188c | 3787 | goto free_modinfo; |
1da177e4 | 3788 | |
22e268eb | 3789 | flush_module_icache(mod); |
378bac82 | 3790 | |
6526c534 RR |
3791 | /* Now copy in args */ |
3792 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3793 | if (IS_ERR(mod->args)) { | |
3794 | err = PTR_ERR(mod->args); | |
3795 | goto free_arch_cleanup; | |
3796 | } | |
8d3b33f6 | 3797 | |
52796312 | 3798 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3799 | |
a949ae56 SRRH |
3800 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3801 | ftrace_module_init(mod); | |
3802 | ||
a3535c7e RR |
3803 | /* Finally it's fully formed, ready to start executing. */ |
3804 | err = complete_formation(mod, info); | |
3805 | if (err) | |
1fb9341a | 3806 | goto ddebug_cleanup; |
be593f4c | 3807 | |
4c973d16 JY |
3808 | err = prepare_coming_module(mod); |
3809 | if (err) | |
3810 | goto bug_cleanup; | |
3811 | ||
51f3d0f4 | 3812 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3813 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3814 | -32768, 32767, mod, |
ecc86170 | 3815 | unknown_module_param_cb); |
51e158c1 RR |
3816 | if (IS_ERR(after_dashes)) { |
3817 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3818 | goto coming_cleanup; |
51e158c1 RR |
3819 | } else if (after_dashes) { |
3820 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3821 | mod->name, after_dashes); | |
3822 | } | |
1da177e4 | 3823 | |
ca86cad7 | 3824 | /* Link in to sysfs. */ |
34e1169d | 3825 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3826 | if (err < 0) |
4c973d16 | 3827 | goto coming_cleanup; |
80a3d1bb | 3828 | |
1ce15ef4 JY |
3829 | if (is_livepatch_module(mod)) { |
3830 | err = copy_module_elf(mod, info); | |
3831 | if (err < 0) | |
3832 | goto sysfs_cleanup; | |
3833 | } | |
3834 | ||
48fd1188 | 3835 | /* Get rid of temporary copy. */ |
34e1169d | 3836 | free_copy(info); |
1da177e4 LT |
3837 | |
3838 | /* Done! */ | |
51f3d0f4 | 3839 | trace_module_load(mod); |
34e1169d KC |
3840 | |
3841 | return do_init_module(mod); | |
1da177e4 | 3842 | |
1ce15ef4 JY |
3843 | sysfs_cleanup: |
3844 | mod_sysfs_teardown(mod); | |
4c973d16 | 3845 | coming_cleanup: |
885a78d4 | 3846 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3847 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3848 | blocking_notifier_call_chain(&module_notify_list, |
3849 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3850 | klp_module_going(mod); |
1fb9341a RR |
3851 | bug_cleanup: |
3852 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3853 | mutex_lock(&module_mutex); |
5336377d | 3854 | module_bug_cleanup(mod); |
ee61abb3 | 3855 | mutex_unlock(&module_mutex); |
ff7e0055 | 3856 | |
a3535c7e | 3857 | ddebug_cleanup: |
1323eac7 | 3858 | ftrace_release_mod(mod); |
52796312 | 3859 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 3860 | synchronize_rcu(); |
6526c534 RR |
3861 | kfree(mod->args); |
3862 | free_arch_cleanup: | |
1da177e4 | 3863 | module_arch_cleanup(mod); |
d913188c | 3864 | free_modinfo: |
a263f776 | 3865 | free_modinfo(mod); |
22e268eb | 3866 | free_unload: |
1da177e4 | 3867 | module_unload_free(mod); |
1fb9341a RR |
3868 | unlink_mod: |
3869 | mutex_lock(&module_mutex); | |
3870 | /* Unlink carefully: kallsyms could be walking list. */ | |
3871 | list_del_rcu(&mod->list); | |
758556bd | 3872 | mod_tree_remove(mod); |
1fb9341a | 3873 | wake_up_all(&module_wq); |
0be964be | 3874 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 3875 | synchronize_rcu(); |
1fb9341a | 3876 | mutex_unlock(&module_mutex); |
d913188c | 3877 | free_module: |
35a9393c | 3878 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3879 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3880 | |
34e1169d | 3881 | module_deallocate(mod, info); |
d913188c | 3882 | free_copy: |
34e1169d KC |
3883 | free_copy(info); |
3884 | return err; | |
b99b87f7 PO |
3885 | } |
3886 | ||
17da2bd9 HC |
3887 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3888 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3889 | { |
34e1169d KC |
3890 | int err; |
3891 | struct load_info info = { }; | |
1da177e4 | 3892 | |
34e1169d KC |
3893 | err = may_init_module(); |
3894 | if (err) | |
3895 | return err; | |
1da177e4 | 3896 | |
34e1169d KC |
3897 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3898 | umod, len, uargs); | |
1da177e4 | 3899 | |
34e1169d KC |
3900 | err = copy_module_from_user(umod, len, &info); |
3901 | if (err) | |
3902 | return err; | |
1da177e4 | 3903 | |
2f3238ae | 3904 | return load_module(&info, uargs, 0); |
34e1169d | 3905 | } |
94462ad3 | 3906 | |
2f3238ae | 3907 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3908 | { |
34e1169d | 3909 | struct load_info info = { }; |
a1db7420 MZ |
3910 | loff_t size; |
3911 | void *hdr; | |
3912 | int err; | |
94462ad3 | 3913 | |
34e1169d KC |
3914 | err = may_init_module(); |
3915 | if (err) | |
3916 | return err; | |
1da177e4 | 3917 | |
2f3238ae | 3918 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3919 | |
2f3238ae RR |
3920 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3921 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3922 | return -EINVAL; | |
d6de2c80 | 3923 | |
a1db7420 MZ |
3924 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
3925 | READING_MODULE); | |
34e1169d KC |
3926 | if (err) |
3927 | return err; | |
a1db7420 MZ |
3928 | info.hdr = hdr; |
3929 | info.len = size; | |
1da177e4 | 3930 | |
2f3238ae | 3931 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3932 | } |
3933 | ||
3934 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3935 | { | |
3936 | return ((void *)addr >= start && (void *)addr < start + size); | |
3937 | } | |
3938 | ||
3939 | #ifdef CONFIG_KALLSYMS | |
3940 | /* | |
3941 | * This ignores the intensely annoying "mapping symbols" found | |
3942 | * in ARM ELF files: $a, $t and $d. | |
3943 | */ | |
3944 | static inline int is_arm_mapping_symbol(const char *str) | |
3945 | { | |
2e3a10a1 RK |
3946 | if (str[0] == '.' && str[1] == 'L') |
3947 | return true; | |
6c34f1f5 | 3948 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3949 | && (str[2] == '\0' || str[2] == '.'); |
3950 | } | |
3951 | ||
2d25bc55 | 3952 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 3953 | { |
8244062e | 3954 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
3955 | } |
3956 | ||
2d25bc55 JY |
3957 | /* |
3958 | * Given a module and address, find the corresponding symbol and return its name | |
3959 | * while providing its size and offset if needed. | |
3960 | */ | |
3961 | static const char *find_kallsyms_symbol(struct module *mod, | |
3962 | unsigned long addr, | |
3963 | unsigned long *size, | |
3964 | unsigned long *offset) | |
1da177e4 LT |
3965 | { |
3966 | unsigned int i, best = 0; | |
93d77e7f | 3967 | unsigned long nextval, bestval; |
8244062e | 3968 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
3969 | |
3970 | /* At worse, next value is at end of module */ | |
a06f6211 | 3971 | if (within_module_init(addr, mod)) |
7523e4dc | 3972 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 3973 | else |
7523e4dc | 3974 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 3975 | |
93d77e7f VW |
3976 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
3977 | ||
25985edc | 3978 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3979 | starts real symbols at 1). */ |
8244062e | 3980 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
3981 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
3982 | unsigned long thisval = kallsyms_symbol_value(sym); | |
3983 | ||
3984 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
3985 | continue; |
3986 | ||
3987 | /* We ignore unnamed symbols: they're uninformative | |
3988 | * and inserted at a whim. */ | |
2d25bc55 JY |
3989 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
3990 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
3991 | continue; |
3992 | ||
93d77e7f | 3993 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 3994 | best = i; |
93d77e7f VW |
3995 | bestval = thisval; |
3996 | } | |
3997 | if (thisval > addr && thisval < nextval) | |
3998 | nextval = thisval; | |
1da177e4 LT |
3999 | } |
4000 | ||
4001 | if (!best) | |
4002 | return NULL; | |
4003 | ||
ffb45122 | 4004 | if (size) |
93d77e7f | 4005 | *size = nextval - bestval; |
ffb45122 | 4006 | if (offset) |
93d77e7f | 4007 | *offset = addr - bestval; |
2d25bc55 JY |
4008 | |
4009 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
4010 | } |
4011 | ||
b865ea64 SS |
4012 | void * __weak dereference_module_function_descriptor(struct module *mod, |
4013 | void *ptr) | |
4014 | { | |
4015 | return ptr; | |
4016 | } | |
4017 | ||
6dd06c9f RR |
4018 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
4019 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 4020 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
4021 | unsigned long *size, |
4022 | unsigned long *offset, | |
4023 | char **modname, | |
4024 | char *namebuf) | |
1da177e4 | 4025 | { |
cb2a5205 | 4026 | const char *ret = NULL; |
b7df4d1b | 4027 | struct module *mod; |
1da177e4 | 4028 | |
cb2a5205 | 4029 | preempt_disable(); |
b7df4d1b PZ |
4030 | mod = __module_address(addr); |
4031 | if (mod) { | |
4032 | if (modname) | |
4033 | *modname = mod->name; | |
2d25bc55 JY |
4034 | |
4035 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4036 | } |
6dd06c9f RR |
4037 | /* Make a copy in here where it's safe */ |
4038 | if (ret) { | |
4039 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4040 | ret = namebuf; | |
4041 | } | |
cb2a5205 | 4042 | preempt_enable(); |
b7df4d1b | 4043 | |
92dfc9dc | 4044 | return ret; |
1da177e4 LT |
4045 | } |
4046 | ||
9d65cb4a AD |
4047 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4048 | { | |
4049 | struct module *mod; | |
4050 | ||
cb2a5205 | 4051 | preempt_disable(); |
d72b3751 | 4052 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4053 | if (mod->state == MODULE_STATE_UNFORMED) |
4054 | continue; | |
9b20a352 | 4055 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4056 | const char *sym; |
4057 | ||
2d25bc55 | 4058 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4059 | if (!sym) |
4060 | goto out; | |
2d25bc55 | 4061 | |
9281acea | 4062 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4063 | preempt_enable(); |
9d65cb4a AD |
4064 | return 0; |
4065 | } | |
4066 | } | |
4067 | out: | |
cb2a5205 | 4068 | preempt_enable(); |
9d65cb4a AD |
4069 | return -ERANGE; |
4070 | } | |
4071 | ||
a5c43dae AD |
4072 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4073 | unsigned long *offset, char *modname, char *name) | |
4074 | { | |
4075 | struct module *mod; | |
4076 | ||
cb2a5205 | 4077 | preempt_disable(); |
d72b3751 | 4078 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4079 | if (mod->state == MODULE_STATE_UNFORMED) |
4080 | continue; | |
9b20a352 | 4081 | if (within_module(addr, mod)) { |
a5c43dae AD |
4082 | const char *sym; |
4083 | ||
2d25bc55 | 4084 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4085 | if (!sym) |
4086 | goto out; | |
4087 | if (modname) | |
9281acea | 4088 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4089 | if (name) |
9281acea | 4090 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4091 | preempt_enable(); |
a5c43dae AD |
4092 | return 0; |
4093 | } | |
4094 | } | |
4095 | out: | |
cb2a5205 | 4096 | preempt_enable(); |
a5c43dae AD |
4097 | return -ERANGE; |
4098 | } | |
4099 | ||
ea07890a AD |
4100 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4101 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4102 | { |
4103 | struct module *mod; | |
4104 | ||
cb2a5205 | 4105 | preempt_disable(); |
d72b3751 | 4106 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4107 | struct mod_kallsyms *kallsyms; |
4108 | ||
0d21b0e3 RR |
4109 | if (mod->state == MODULE_STATE_UNFORMED) |
4110 | continue; | |
8244062e RR |
4111 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4112 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4113 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4114 | ||
4115 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4116 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4117 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4118 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4119 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4120 | preempt_enable(); |
ea07890a | 4121 | return 0; |
1da177e4 | 4122 | } |
8244062e | 4123 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4124 | } |
cb2a5205 | 4125 | preempt_enable(); |
ea07890a | 4126 | return -ERANGE; |
1da177e4 LT |
4127 | } |
4128 | ||
2d25bc55 JY |
4129 | /* Given a module and name of symbol, find and return the symbol's value */ |
4130 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4131 | { |
4132 | unsigned int i; | |
8244062e | 4133 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4134 | |
93d77e7f VW |
4135 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4136 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4137 | ||
2d25bc55 | 4138 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4139 | sym->st_shndx != SHN_UNDEF) |
4140 | return kallsyms_symbol_value(sym); | |
4141 | } | |
1da177e4 LT |
4142 | return 0; |
4143 | } | |
4144 | ||
4145 | /* Look for this name: can be of form module:name. */ | |
4146 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4147 | { | |
4148 | struct module *mod; | |
4149 | char *colon; | |
4150 | unsigned long ret = 0; | |
4151 | ||
4152 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4153 | preempt_disable(); |
17586188 | 4154 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4155 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4156 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4157 | } else { |
0d21b0e3 RR |
4158 | list_for_each_entry_rcu(mod, &modules, list) { |
4159 | if (mod->state == MODULE_STATE_UNFORMED) | |
4160 | continue; | |
2d25bc55 | 4161 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4162 | break; |
0d21b0e3 | 4163 | } |
1da177e4 | 4164 | } |
cb2a5205 | 4165 | preempt_enable(); |
1da177e4 LT |
4166 | return ret; |
4167 | } | |
75a66614 AK |
4168 | |
4169 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4170 | struct module *, unsigned long), | |
4171 | void *data) | |
4172 | { | |
4173 | struct module *mod; | |
4174 | unsigned int i; | |
4175 | int ret; | |
4176 | ||
0be964be PZ |
4177 | module_assert_mutex(); |
4178 | ||
75a66614 | 4179 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4180 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4181 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4182 | ||
0d21b0e3 RR |
4183 | if (mod->state == MODULE_STATE_UNFORMED) |
4184 | continue; | |
8244062e | 4185 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4186 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4187 | |
93d77e7f | 4188 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4189 | continue; |
4190 | ||
2d25bc55 | 4191 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4192 | mod, kallsyms_symbol_value(sym)); |
75a66614 AK |
4193 | if (ret != 0) |
4194 | return ret; | |
4195 | } | |
4196 | } | |
4197 | return 0; | |
4198 | } | |
1da177e4 LT |
4199 | #endif /* CONFIG_KALLSYMS */ |
4200 | ||
7fd8329b PM |
4201 | /* Maximum number of characters written by module_flags() */ |
4202 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4203 | ||
4204 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4205 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4206 | { |
4207 | int bx = 0; | |
4208 | ||
0d21b0e3 | 4209 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4210 | if (mod->taints || |
4211 | mod->state == MODULE_STATE_GOING || | |
4212 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4213 | buf[bx++] = '('; |
cca3e707 | 4214 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4215 | /* Show a - for module-is-being-unloaded */ |
4216 | if (mod->state == MODULE_STATE_GOING) | |
4217 | buf[bx++] = '-'; | |
4218 | /* Show a + for module-is-being-loaded */ | |
4219 | if (mod->state == MODULE_STATE_COMING) | |
4220 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4221 | buf[bx++] = ')'; |
4222 | } | |
4223 | buf[bx] = '\0'; | |
4224 | ||
4225 | return buf; | |
4226 | } | |
4227 | ||
3b5d5c6b AD |
4228 | #ifdef CONFIG_PROC_FS |
4229 | /* Called by the /proc file system to return a list of modules. */ | |
4230 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4231 | { | |
4232 | mutex_lock(&module_mutex); | |
4233 | return seq_list_start(&modules, *pos); | |
4234 | } | |
4235 | ||
4236 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4237 | { | |
4238 | return seq_list_next(p, &modules, pos); | |
4239 | } | |
4240 | ||
4241 | static void m_stop(struct seq_file *m, void *p) | |
4242 | { | |
4243 | mutex_unlock(&module_mutex); | |
4244 | } | |
4245 | ||
1da177e4 LT |
4246 | static int m_show(struct seq_file *m, void *p) |
4247 | { | |
4248 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4249 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4250 | void *value; |
fa3ba2e8 | 4251 | |
0d21b0e3 RR |
4252 | /* We always ignore unformed modules. */ |
4253 | if (mod->state == MODULE_STATE_UNFORMED) | |
4254 | return 0; | |
4255 | ||
2f0f2a33 | 4256 | seq_printf(m, "%s %u", |
7523e4dc | 4257 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4258 | print_unload_info(m, mod); |
4259 | ||
4260 | /* Informative for users. */ | |
4261 | seq_printf(m, " %s", | |
6da0b565 IA |
4262 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4263 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4264 | "Live"); |
4265 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4266 | value = m->private ? NULL : mod->core_layout.base; |
4267 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4268 | |
fa3ba2e8 FM |
4269 | /* Taints info */ |
4270 | if (mod->taints) | |
21aa9280 | 4271 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4272 | |
6da0b565 | 4273 | seq_puts(m, "\n"); |
1da177e4 LT |
4274 | return 0; |
4275 | } | |
4276 | ||
4277 | /* Format: modulename size refcount deps address | |
4278 | ||
4279 | Where refcount is a number or -, and deps is a comma-separated list | |
4280 | of depends or -. | |
4281 | */ | |
3b5d5c6b | 4282 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4283 | .start = m_start, |
4284 | .next = m_next, | |
4285 | .stop = m_stop, | |
4286 | .show = m_show | |
4287 | }; | |
4288 | ||
516fb7f2 LT |
4289 | /* |
4290 | * This also sets the "private" pointer to non-NULL if the | |
4291 | * kernel pointers should be hidden (so you can just test | |
4292 | * "m->private" to see if you should keep the values private). | |
4293 | * | |
4294 | * We use the same logic as for /proc/kallsyms. | |
4295 | */ | |
3b5d5c6b AD |
4296 | static int modules_open(struct inode *inode, struct file *file) |
4297 | { | |
516fb7f2 LT |
4298 | int err = seq_open(file, &modules_op); |
4299 | ||
4300 | if (!err) { | |
4301 | struct seq_file *m = file->private_data; | |
4302 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4303 | } | |
4304 | ||
3f553b30 | 4305 | return err; |
3b5d5c6b AD |
4306 | } |
4307 | ||
4308 | static const struct file_operations proc_modules_operations = { | |
4309 | .open = modules_open, | |
4310 | .read = seq_read, | |
4311 | .llseek = seq_lseek, | |
4312 | .release = seq_release, | |
4313 | }; | |
4314 | ||
4315 | static int __init proc_modules_init(void) | |
4316 | { | |
4317 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4318 | return 0; | |
4319 | } | |
4320 | module_init(proc_modules_init); | |
4321 | #endif | |
4322 | ||
1da177e4 LT |
4323 | /* Given an address, look for it in the module exception tables. */ |
4324 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4325 | { | |
1da177e4 LT |
4326 | const struct exception_table_entry *e = NULL; |
4327 | struct module *mod; | |
4328 | ||
24da1cbf | 4329 | preempt_disable(); |
5ff22646 PZ |
4330 | mod = __module_address(addr); |
4331 | if (!mod) | |
4332 | goto out; | |
22a8bdeb | 4333 | |
5ff22646 PZ |
4334 | if (!mod->num_exentries) |
4335 | goto out; | |
4336 | ||
4337 | e = search_extable(mod->extable, | |
a94c33dd | 4338 | mod->num_exentries, |
5ff22646 PZ |
4339 | addr); |
4340 | out: | |
24da1cbf | 4341 | preempt_enable(); |
1da177e4 | 4342 | |
5ff22646 PZ |
4343 | /* |
4344 | * Now, if we found one, we are running inside it now, hence | |
4345 | * we cannot unload the module, hence no refcnt needed. | |
4346 | */ | |
1da177e4 LT |
4347 | return e; |
4348 | } | |
4349 | ||
4d435f9d | 4350 | /* |
e610499e RR |
4351 | * is_module_address - is this address inside a module? |
4352 | * @addr: the address to check. | |
4353 | * | |
4354 | * See is_module_text_address() if you simply want to see if the address | |
4355 | * is code (not data). | |
4d435f9d | 4356 | */ |
e610499e | 4357 | bool is_module_address(unsigned long addr) |
4d435f9d | 4358 | { |
e610499e | 4359 | bool ret; |
4d435f9d | 4360 | |
24da1cbf | 4361 | preempt_disable(); |
e610499e | 4362 | ret = __module_address(addr) != NULL; |
24da1cbf | 4363 | preempt_enable(); |
4d435f9d | 4364 | |
e610499e | 4365 | return ret; |
4d435f9d IM |
4366 | } |
4367 | ||
e610499e RR |
4368 | /* |
4369 | * __module_address - get the module which contains an address. | |
4370 | * @addr: the address. | |
4371 | * | |
4372 | * Must be called with preempt disabled or module mutex held so that | |
4373 | * module doesn't get freed during this. | |
4374 | */ | |
714f83d5 | 4375 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4376 | { |
4377 | struct module *mod; | |
4378 | ||
3a642e99 RR |
4379 | if (addr < module_addr_min || addr > module_addr_max) |
4380 | return NULL; | |
4381 | ||
0be964be PZ |
4382 | module_assert_mutex_or_preempt(); |
4383 | ||
6c9692e2 | 4384 | mod = mod_find(addr); |
93c2e105 PZ |
4385 | if (mod) { |
4386 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4387 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4388 | mod = NULL; |
0d21b0e3 | 4389 | } |
93c2e105 | 4390 | return mod; |
1da177e4 | 4391 | } |
c6b37801 | 4392 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4393 | |
e610499e RR |
4394 | /* |
4395 | * is_module_text_address - is this address inside module code? | |
4396 | * @addr: the address to check. | |
4397 | * | |
4398 | * See is_module_address() if you simply want to see if the address is | |
4399 | * anywhere in a module. See kernel_text_address() for testing if an | |
4400 | * address corresponds to kernel or module code. | |
4401 | */ | |
4402 | bool is_module_text_address(unsigned long addr) | |
4403 | { | |
4404 | bool ret; | |
4405 | ||
4406 | preempt_disable(); | |
4407 | ret = __module_text_address(addr) != NULL; | |
4408 | preempt_enable(); | |
4409 | ||
4410 | return ret; | |
4411 | } | |
4412 | ||
4413 | /* | |
4414 | * __module_text_address - get the module whose code contains an address. | |
4415 | * @addr: the address. | |
4416 | * | |
4417 | * Must be called with preempt disabled or module mutex held so that | |
4418 | * module doesn't get freed during this. | |
4419 | */ | |
4420 | struct module *__module_text_address(unsigned long addr) | |
4421 | { | |
4422 | struct module *mod = __module_address(addr); | |
4423 | if (mod) { | |
4424 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4425 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4426 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4427 | mod = NULL; |
4428 | } | |
4429 | return mod; | |
4430 | } | |
c6b37801 | 4431 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4432 | |
1da177e4 LT |
4433 | /* Don't grab lock, we're oopsing. */ |
4434 | void print_modules(void) | |
4435 | { | |
4436 | struct module *mod; | |
7fd8329b | 4437 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4438 | |
b231125a | 4439 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4440 | /* Most callers should already have preempt disabled, but make sure */ |
4441 | preempt_disable(); | |
0d21b0e3 RR |
4442 | list_for_each_entry_rcu(mod, &modules, list) { |
4443 | if (mod->state == MODULE_STATE_UNFORMED) | |
4444 | continue; | |
27bba4d6 | 4445 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4446 | } |
d72b3751 | 4447 | preempt_enable(); |
e14af7ee | 4448 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4449 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4450 | pr_cont("\n"); | |
1da177e4 LT |
4451 | } |
4452 | ||
1da177e4 | 4453 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4454 | /* Generate the signature for all relevant module structures here. |
4455 | * If these change, we don't want to try to parse the module. */ | |
4456 | void module_layout(struct module *mod, | |
4457 | struct modversion_info *ver, | |
4458 | struct kernel_param *kp, | |
4459 | struct kernel_symbol *ks, | |
65498646 | 4460 | struct tracepoint * const *tp) |
8c8ef42a RR |
4461 | { |
4462 | } | |
4463 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4464 | #endif |