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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> |
c8424e77 | 10 | #include <linux/module_signature.h> |
af658dca | 11 | #include <linux/trace_events.h> |
1da177e4 | 12 | #include <linux/init.h> |
ae84e324 | 13 | #include <linux/kallsyms.h> |
34e1169d | 14 | #include <linux/file.h> |
3b5d5c6b | 15 | #include <linux/fs.h> |
6d760133 | 16 | #include <linux/sysfs.h> |
9f158333 | 17 | #include <linux/kernel.h> |
1da177e4 LT |
18 | #include <linux/slab.h> |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/elf.h> | |
3b5d5c6b | 21 | #include <linux/proc_fs.h> |
2e72d51b | 22 | #include <linux/security.h> |
1da177e4 LT |
23 | #include <linux/seq_file.h> |
24 | #include <linux/syscalls.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/rcupdate.h> | |
c59ede7b | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/cpu.h> |
29 | #include <linux/moduleparam.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/err.h> | |
32 | #include <linux/vermagic.h> | |
33 | #include <linux/notifier.h> | |
f6a57033 | 34 | #include <linux/sched.h> |
1da177e4 | 35 | #include <linux/device.h> |
c988d2b2 | 36 | #include <linux/string.h> |
97d1f15b | 37 | #include <linux/mutex.h> |
d72b3751 | 38 | #include <linux/rculist.h> |
7c0f6ba6 | 39 | #include <linux/uaccess.h> |
1da177e4 | 40 | #include <asm/cacheflush.h> |
563ec5cb | 41 | #include <linux/set_memory.h> |
eb8cdec4 | 42 | #include <asm/mmu_context.h> |
b817f6fe | 43 | #include <linux/license.h> |
6d762394 | 44 | #include <asm/sections.h> |
97e1c18e | 45 | #include <linux/tracepoint.h> |
90d595fe | 46 | #include <linux/ftrace.h> |
7e545d6e | 47 | #include <linux/livepatch.h> |
22a9d645 | 48 | #include <linux/async.h> |
fbf59bc9 | 49 | #include <linux/percpu.h> |
4f2294b6 | 50 | #include <linux/kmemleak.h> |
bf5438fc | 51 | #include <linux/jump_label.h> |
84e1c6bb | 52 | #include <linux/pfn.h> |
403ed278 | 53 | #include <linux/bsearch.h> |
9d5059c9 | 54 | #include <linux/dynamic_debug.h> |
ca86cad7 | 55 | #include <linux/audit.h> |
2f3238ae | 56 | #include <uapi/linux/module.h> |
106a4ee2 | 57 | #include "module-internal.h" |
1da177e4 | 58 | |
7ead8b83 LZ |
59 | #define CREATE_TRACE_POINTS |
60 | #include <trace/events/module.h> | |
61 | ||
1da177e4 LT |
62 | #ifndef ARCH_SHF_SMALL |
63 | #define ARCH_SHF_SMALL 0 | |
64 | #endif | |
65 | ||
84e1c6bb | 66 | /* |
67 | * Modules' sections will be aligned on page boundaries | |
3b5be16c HZ |
68 | * to ensure complete separation of code and data, but |
69 | * only when CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y | |
84e1c6bb | 70 | */ |
3b5be16c | 71 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb | 72 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
3b5be16c HZ |
73 | #else |
74 | # define debug_align(X) (X) | |
75 | #endif | |
84e1c6bb | 76 | |
1da177e4 LT |
77 | /* If this is set, the section belongs in the init part of the module */ |
78 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
79 | ||
75676500 RR |
80 | /* |
81 | * Mutex protects: | |
82 | * 1) List of modules (also safely readable with preempt_disable), | |
83 | * 2) module_use links, | |
84 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 85 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
86 | DEFINE_MUTEX(module_mutex); |
87 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 88 | static LIST_HEAD(modules); |
67fc4e0c | 89 | |
1a7b7d92 RE |
90 | /* Work queue for freeing init sections in success case */ |
91 | static struct work_struct init_free_wq; | |
92 | static struct llist_head init_free_list; | |
93 | ||
6c9692e2 | 94 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 95 | |
93c2e105 PZ |
96 | /* |
97 | * Use a latched RB-tree for __module_address(); this allows us to use | |
98 | * RCU-sched lookups of the address from any context. | |
99 | * | |
6c9692e2 PZ |
100 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
101 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
102 | * NMI context. | |
93c2e105 PZ |
103 | */ |
104 | ||
105 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 106 | { |
7523e4dc | 107 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 108 | |
7523e4dc | 109 | return (unsigned long)layout->base; |
93c2e105 PZ |
110 | } |
111 | ||
112 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
113 | { | |
7523e4dc | 114 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 115 | |
7523e4dc | 116 | return (unsigned long)layout->size; |
93c2e105 PZ |
117 | } |
118 | ||
119 | static __always_inline bool | |
120 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
121 | { | |
122 | return __mod_tree_val(a) < __mod_tree_val(b); | |
123 | } | |
124 | ||
125 | static __always_inline int | |
126 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
127 | { | |
128 | unsigned long val = (unsigned long)key; | |
129 | unsigned long start, end; | |
130 | ||
131 | start = __mod_tree_val(n); | |
132 | if (val < start) | |
133 | return -1; | |
134 | ||
135 | end = start + __mod_tree_size(n); | |
136 | if (val >= end) | |
137 | return 1; | |
106a4ee2 | 138 | |
106a4ee2 RR |
139 | return 0; |
140 | } | |
141 | ||
93c2e105 PZ |
142 | static const struct latch_tree_ops mod_tree_ops = { |
143 | .less = mod_tree_less, | |
144 | .comp = mod_tree_comp, | |
145 | }; | |
146 | ||
4f666546 PZ |
147 | static struct mod_tree_root { |
148 | struct latch_tree_root root; | |
149 | unsigned long addr_min; | |
150 | unsigned long addr_max; | |
151 | } mod_tree __cacheline_aligned = { | |
152 | .addr_min = -1UL, | |
106a4ee2 | 153 | }; |
106a4ee2 | 154 | |
4f666546 PZ |
155 | #define module_addr_min mod_tree.addr_min |
156 | #define module_addr_max mod_tree.addr_max | |
157 | ||
158 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
159 | { | |
160 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
161 | } | |
162 | ||
163 | static void __mod_tree_remove(struct mod_tree_node *node) | |
164 | { | |
165 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
166 | } | |
93c2e105 PZ |
167 | |
168 | /* | |
169 | * These modifications: insert, remove_init and remove; are serialized by the | |
170 | * module_mutex. | |
171 | */ | |
172 | static void mod_tree_insert(struct module *mod) | |
173 | { | |
7523e4dc RR |
174 | mod->core_layout.mtn.mod = mod; |
175 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 176 | |
7523e4dc RR |
177 | __mod_tree_insert(&mod->core_layout.mtn); |
178 | if (mod->init_layout.size) | |
179 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
180 | } |
181 | ||
182 | static void mod_tree_remove_init(struct module *mod) | |
183 | { | |
7523e4dc RR |
184 | if (mod->init_layout.size) |
185 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
186 | } |
187 | ||
188 | static void mod_tree_remove(struct module *mod) | |
189 | { | |
7523e4dc | 190 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
191 | mod_tree_remove_init(mod); |
192 | } | |
193 | ||
6c9692e2 | 194 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
195 | { |
196 | struct latch_tree_node *ltn; | |
197 | ||
4f666546 | 198 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
199 | if (!ltn) |
200 | return NULL; | |
201 | ||
202 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
203 | } | |
204 | ||
6c9692e2 PZ |
205 | #else /* MODULES_TREE_LOOKUP */ |
206 | ||
4f666546 PZ |
207 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
208 | ||
6c9692e2 PZ |
209 | static void mod_tree_insert(struct module *mod) { } |
210 | static void mod_tree_remove_init(struct module *mod) { } | |
211 | static void mod_tree_remove(struct module *mod) { } | |
212 | ||
213 | static struct module *mod_find(unsigned long addr) | |
214 | { | |
215 | struct module *mod; | |
216 | ||
217 | list_for_each_entry_rcu(mod, &modules, list) { | |
218 | if (within_module(addr, mod)) | |
219 | return mod; | |
220 | } | |
221 | ||
222 | return NULL; | |
223 | } | |
224 | ||
225 | #endif /* MODULES_TREE_LOOKUP */ | |
226 | ||
4f666546 PZ |
227 | /* |
228 | * Bounds of module text, for speeding up __module_address. | |
229 | * Protected by module_mutex. | |
230 | */ | |
231 | static void __mod_update_bounds(void *base, unsigned int size) | |
232 | { | |
233 | unsigned long min = (unsigned long)base; | |
234 | unsigned long max = min + size; | |
235 | ||
236 | if (min < module_addr_min) | |
237 | module_addr_min = min; | |
238 | if (max > module_addr_max) | |
239 | module_addr_max = max; | |
240 | } | |
241 | ||
242 | static void mod_update_bounds(struct module *mod) | |
243 | { | |
7523e4dc RR |
244 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
245 | if (mod->init_layout.size) | |
246 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
247 | } |
248 | ||
67fc4e0c JW |
249 | #ifdef CONFIG_KGDB_KDB |
250 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
251 | #endif /* CONFIG_KGDB_KDB */ | |
252 | ||
0be964be PZ |
253 | static void module_assert_mutex(void) |
254 | { | |
255 | lockdep_assert_held(&module_mutex); | |
256 | } | |
257 | ||
258 | static void module_assert_mutex_or_preempt(void) | |
259 | { | |
260 | #ifdef CONFIG_LOCKDEP | |
261 | if (unlikely(!debug_locks)) | |
262 | return; | |
263 | ||
9502514f | 264 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
265 | !lockdep_is_held(&module_mutex)); |
266 | #endif | |
267 | } | |
268 | ||
6727bb9c | 269 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 270 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 271 | |
fda784e5 BM |
272 | /* |
273 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
274 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
275 | */ | |
276 | bool is_module_sig_enforced(void) | |
277 | { | |
278 | return sig_enforce; | |
279 | } | |
280 | EXPORT_SYMBOL(is_module_sig_enforced); | |
281 | ||
8db5da0b MZ |
282 | void set_module_sig_enforced(void) |
283 | { | |
284 | sig_enforce = true; | |
285 | } | |
286 | ||
19e4529e SR |
287 | /* Block module loading/unloading? */ |
288 | int modules_disabled = 0; | |
02608bef | 289 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 290 | |
c9a3ba55 RR |
291 | /* Waiting for a module to finish initializing? */ |
292 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
293 | ||
e041c683 | 294 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 295 | |
6da0b565 | 296 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 297 | { |
e041c683 | 298 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
299 | } |
300 | EXPORT_SYMBOL(register_module_notifier); | |
301 | ||
6da0b565 | 302 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 303 | { |
e041c683 | 304 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
305 | } |
306 | EXPORT_SYMBOL(unregister_module_notifier); | |
307 | ||
71d9f507 MB |
308 | /* |
309 | * We require a truly strong try_module_get(): 0 means success. | |
310 | * Otherwise an error is returned due to ongoing or failed | |
311 | * initialization etc. | |
312 | */ | |
1da177e4 LT |
313 | static inline int strong_try_module_get(struct module *mod) |
314 | { | |
0d21b0e3 | 315 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 316 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
317 | return -EBUSY; |
318 | if (try_module_get(mod)) | |
1da177e4 | 319 | return 0; |
c9a3ba55 RR |
320 | else |
321 | return -ENOENT; | |
1da177e4 LT |
322 | } |
323 | ||
373d4d09 RR |
324 | static inline void add_taint_module(struct module *mod, unsigned flag, |
325 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 326 | { |
373d4d09 | 327 | add_taint(flag, lockdep_ok); |
7fd8329b | 328 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
329 | } |
330 | ||
02a3e59a RD |
331 | /* |
332 | * A thread that wants to hold a reference to a module only while it | |
333 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 334 | */ |
bf262dce | 335 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
336 | { |
337 | module_put(mod); | |
338 | do_exit(code); | |
339 | } | |
340 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 341 | |
1da177e4 | 342 | /* Find a module section: 0 means not found. */ |
49668688 | 343 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
344 | { |
345 | unsigned int i; | |
346 | ||
49668688 RR |
347 | for (i = 1; i < info->hdr->e_shnum; i++) { |
348 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 349 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
350 | if ((shdr->sh_flags & SHF_ALLOC) |
351 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 352 | return i; |
49668688 | 353 | } |
1da177e4 LT |
354 | return 0; |
355 | } | |
356 | ||
5e458cc0 | 357 | /* Find a module section, or NULL. */ |
49668688 | 358 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
359 | { |
360 | /* Section 0 has sh_addr 0. */ | |
49668688 | 361 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
362 | } |
363 | ||
364 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 365 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
366 | const char *name, |
367 | size_t object_size, | |
368 | unsigned int *num) | |
369 | { | |
49668688 | 370 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
371 | |
372 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
373 | *num = info->sechdrs[sec].sh_size / object_size; |
374 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
375 | } |
376 | ||
1da177e4 LT |
377 | /* Provided by the linker */ |
378 | extern const struct kernel_symbol __start___ksymtab[]; | |
379 | extern const struct kernel_symbol __stop___ksymtab[]; | |
380 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
381 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
382 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
383 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
384 | extern const s32 __start___kcrctab[]; |
385 | extern const s32 __start___kcrctab_gpl[]; | |
386 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
387 | #ifdef CONFIG_UNUSED_SYMBOLS |
388 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
389 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
390 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
391 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
392 | extern const s32 __start___kcrctab_unused[]; |
393 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 394 | #endif |
1da177e4 LT |
395 | |
396 | #ifndef CONFIG_MODVERSIONS | |
397 | #define symversion(base, idx) NULL | |
398 | #else | |
f83ca9fe | 399 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
400 | #endif |
401 | ||
dafd0940 RR |
402 | static bool each_symbol_in_section(const struct symsearch *arr, |
403 | unsigned int arrsize, | |
404 | struct module *owner, | |
405 | bool (*fn)(const struct symsearch *syms, | |
406 | struct module *owner, | |
de4d8d53 | 407 | void *data), |
dafd0940 | 408 | void *data) |
ad9546c9 | 409 | { |
de4d8d53 | 410 | unsigned int j; |
ad9546c9 | 411 | |
dafd0940 | 412 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
413 | if (fn(&arr[j], owner, data)) |
414 | return true; | |
f71d20e9 | 415 | } |
dafd0940 RR |
416 | |
417 | return false; | |
ad9546c9 RR |
418 | } |
419 | ||
dafd0940 | 420 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
421 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
422 | struct module *owner, | |
423 | void *data), | |
424 | void *data) | |
ad9546c9 RR |
425 | { |
426 | struct module *mod; | |
44032e63 | 427 | static const struct symsearch arr[] = { |
ad9546c9 | 428 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 429 | NOT_GPL_ONLY, false }, |
ad9546c9 | 430 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
431 | __start___kcrctab_gpl, |
432 | GPL_ONLY, false }, | |
ad9546c9 | 433 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
434 | __start___kcrctab_gpl_future, |
435 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 436 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 437 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
438 | __start___kcrctab_unused, |
439 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 440 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
441 | __start___kcrctab_unused_gpl, |
442 | GPL_ONLY, true }, | |
f7f5b675 | 443 | #endif |
ad9546c9 | 444 | }; |
f71d20e9 | 445 | |
0be964be PZ |
446 | module_assert_mutex_or_preempt(); |
447 | ||
dafd0940 RR |
448 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
449 | return true; | |
f71d20e9 | 450 | |
d72b3751 | 451 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
452 | struct symsearch arr[] = { |
453 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 454 | NOT_GPL_ONLY, false }, |
ad9546c9 | 455 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
456 | mod->gpl_crcs, |
457 | GPL_ONLY, false }, | |
ad9546c9 RR |
458 | { mod->gpl_future_syms, |
459 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
460 | mod->gpl_future_crcs, |
461 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 462 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
463 | { mod->unused_syms, |
464 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
465 | mod->unused_crcs, |
466 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
467 | { mod->unused_gpl_syms, |
468 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
469 | mod->unused_gpl_crcs, |
470 | GPL_ONLY, true }, | |
f7f5b675 | 471 | #endif |
ad9546c9 RR |
472 | }; |
473 | ||
0d21b0e3 RR |
474 | if (mod->state == MODULE_STATE_UNFORMED) |
475 | continue; | |
476 | ||
dafd0940 RR |
477 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
478 | return true; | |
479 | } | |
480 | return false; | |
481 | } | |
de4d8d53 | 482 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
483 | |
484 | struct find_symbol_arg { | |
485 | /* Input */ | |
486 | const char *name; | |
487 | bool gplok; | |
488 | bool warn; | |
489 | ||
490 | /* Output */ | |
491 | struct module *owner; | |
71810db2 | 492 | const s32 *crc; |
414fd31b | 493 | const struct kernel_symbol *sym; |
dafd0940 RR |
494 | }; |
495 | ||
2d25bc55 JY |
496 | static bool check_exported_symbol(const struct symsearch *syms, |
497 | struct module *owner, | |
498 | unsigned int symnum, void *data) | |
dafd0940 RR |
499 | { |
500 | struct find_symbol_arg *fsa = data; | |
501 | ||
dafd0940 RR |
502 | if (!fsa->gplok) { |
503 | if (syms->licence == GPL_ONLY) | |
504 | return false; | |
505 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
506 | pr_warn("Symbol %s is being used by a non-GPL module, " |
507 | "which will not be allowed in the future\n", | |
508 | fsa->name); | |
9f28bb7e | 509 | } |
1da177e4 | 510 | } |
ad9546c9 | 511 | |
f7f5b675 | 512 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 513 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
514 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
515 | "using it.\n", fsa->name); | |
516 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
517 | pr_warn("Please evaluate if this is the right api to use and " |
518 | "if it really is, submit a report to the linux kernel " | |
519 | "mailing list together with submitting your code for " | |
bddb12b3 | 520 | "inclusion.\n"); |
dafd0940 | 521 | } |
f7f5b675 | 522 | #endif |
dafd0940 RR |
523 | |
524 | fsa->owner = owner; | |
525 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 526 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
527 | return true; |
528 | } | |
529 | ||
7290d580 AB |
530 | static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
531 | { | |
532 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
533 | return (unsigned long)offset_to_ptr(&sym->value_offset); | |
534 | #else | |
535 | return sym->value; | |
536 | #endif | |
537 | } | |
538 | ||
539 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) | |
540 | { | |
541 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
542 | return offset_to_ptr(&sym->name_offset); | |
543 | #else | |
544 | return sym->name; | |
545 | #endif | |
546 | } | |
547 | ||
8651ec01 MM |
548 | static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
549 | { | |
550 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
069e1c07 WD |
551 | if (!sym->namespace_offset) |
552 | return NULL; | |
8651ec01 MM |
553 | return offset_to_ptr(&sym->namespace_offset); |
554 | #else | |
555 | return sym->namespace; | |
556 | #endif | |
557 | } | |
558 | ||
b605be65 | 559 | static int cmp_name(const void *name, const void *sym) |
403ed278 | 560 | { |
b605be65 | 561 | return strcmp(name, kernel_symbol_name(sym)); |
403ed278 AIB |
562 | } |
563 | ||
2d25bc55 JY |
564 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
565 | struct module *owner, | |
566 | void *data) | |
de4d8d53 RR |
567 | { |
568 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
569 | struct kernel_symbol *sym; |
570 | ||
571 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
572 | sizeof(struct kernel_symbol), cmp_name); | |
573 | ||
2d25bc55 JY |
574 | if (sym != NULL && check_exported_symbol(syms, owner, |
575 | sym - syms->start, data)) | |
403ed278 | 576 | return true; |
de4d8d53 | 577 | |
de4d8d53 RR |
578 | return false; |
579 | } | |
580 | ||
2d25bc55 | 581 | /* Find an exported symbol and return it, along with, (optional) crc and |
75676500 | 582 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
583 | const struct kernel_symbol *find_symbol(const char *name, |
584 | struct module **owner, | |
71810db2 | 585 | const s32 **crc, |
c6b37801 TA |
586 | bool gplok, |
587 | bool warn) | |
dafd0940 RR |
588 | { |
589 | struct find_symbol_arg fsa; | |
590 | ||
591 | fsa.name = name; | |
592 | fsa.gplok = gplok; | |
593 | fsa.warn = warn; | |
594 | ||
2d25bc55 | 595 | if (each_symbol_section(find_exported_symbol_in_section, &fsa)) { |
dafd0940 RR |
596 | if (owner) |
597 | *owner = fsa.owner; | |
598 | if (crc) | |
599 | *crc = fsa.crc; | |
414fd31b | 600 | return fsa.sym; |
dafd0940 RR |
601 | } |
602 | ||
5e124169 | 603 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 604 | return NULL; |
1da177e4 | 605 | } |
c6b37801 | 606 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 607 | |
fe0d34d2 RR |
608 | /* |
609 | * Search for module by name: must hold module_mutex (or preempt disabled | |
610 | * for read-only access). | |
611 | */ | |
4f6de4d5 | 612 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 613 | bool even_unformed) |
1da177e4 LT |
614 | { |
615 | struct module *mod; | |
616 | ||
fe0d34d2 | 617 | module_assert_mutex_or_preempt(); |
0be964be | 618 | |
93437353 | 619 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
620 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
621 | continue; | |
4f6de4d5 | 622 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
623 | return mod; |
624 | } | |
625 | return NULL; | |
626 | } | |
0d21b0e3 RR |
627 | |
628 | struct module *find_module(const char *name) | |
629 | { | |
fe0d34d2 | 630 | module_assert_mutex(); |
4f6de4d5 | 631 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 632 | } |
c6b37801 | 633 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
634 | |
635 | #ifdef CONFIG_SMP | |
fbf59bc9 | 636 | |
259354de | 637 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 638 | { |
259354de TH |
639 | return mod->percpu; |
640 | } | |
fbf59bc9 | 641 | |
9eb76d77 | 642 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 643 | { |
9eb76d77 RR |
644 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
645 | unsigned long align = pcpusec->sh_addralign; | |
646 | ||
647 | if (!pcpusec->sh_size) | |
648 | return 0; | |
649 | ||
fbf59bc9 | 650 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
651 | pr_warn("%s: per-cpu alignment %li > %li\n", |
652 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
653 | align = PAGE_SIZE; |
654 | } | |
655 | ||
9eb76d77 | 656 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 657 | if (!mod->percpu) { |
bddb12b3 AM |
658 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
659 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
660 | return -ENOMEM; |
661 | } | |
9eb76d77 | 662 | mod->percpu_size = pcpusec->sh_size; |
259354de | 663 | return 0; |
fbf59bc9 TH |
664 | } |
665 | ||
259354de | 666 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 667 | { |
259354de | 668 | free_percpu(mod->percpu); |
fbf59bc9 TH |
669 | } |
670 | ||
49668688 | 671 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 672 | { |
49668688 | 673 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
674 | } |
675 | ||
259354de TH |
676 | static void percpu_modcopy(struct module *mod, |
677 | const void *from, unsigned long size) | |
6b588c18 TH |
678 | { |
679 | int cpu; | |
680 | ||
681 | for_each_possible_cpu(cpu) | |
259354de | 682 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
683 | } |
684 | ||
383776fa | 685 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
686 | { |
687 | struct module *mod; | |
688 | unsigned int cpu; | |
689 | ||
690 | preempt_disable(); | |
691 | ||
692 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
693 | if (mod->state == MODULE_STATE_UNFORMED) |
694 | continue; | |
10fad5e4 TH |
695 | if (!mod->percpu_size) |
696 | continue; | |
697 | for_each_possible_cpu(cpu) { | |
698 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 699 | void *va = (void *)addr; |
10fad5e4 | 700 | |
383776fa | 701 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 702 | if (can_addr) { |
383776fa | 703 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
704 | *can_addr += (unsigned long) |
705 | per_cpu_ptr(mod->percpu, | |
706 | get_boot_cpu_id()); | |
707 | } | |
10fad5e4 TH |
708 | preempt_enable(); |
709 | return true; | |
710 | } | |
711 | } | |
712 | } | |
713 | ||
714 | preempt_enable(); | |
715 | return false; | |
6b588c18 TH |
716 | } |
717 | ||
383776fa TG |
718 | /** |
719 | * is_module_percpu_address - test whether address is from module static percpu | |
720 | * @addr: address to test | |
721 | * | |
722 | * Test whether @addr belongs to module static percpu area. | |
723 | * | |
724 | * RETURNS: | |
725 | * %true if @addr is from module static percpu area | |
726 | */ | |
727 | bool is_module_percpu_address(unsigned long addr) | |
728 | { | |
729 | return __is_module_percpu_address(addr, NULL); | |
730 | } | |
731 | ||
1da177e4 | 732 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 733 | |
259354de | 734 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
735 | { |
736 | return NULL; | |
737 | } | |
9eb76d77 | 738 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 739 | { |
9eb76d77 RR |
740 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
741 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
742 | return -ENOMEM; | |
743 | return 0; | |
259354de TH |
744 | } |
745 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 746 | { |
1da177e4 | 747 | } |
49668688 | 748 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
749 | { |
750 | return 0; | |
751 | } | |
259354de TH |
752 | static inline void percpu_modcopy(struct module *mod, |
753 | const void *from, unsigned long size) | |
1da177e4 LT |
754 | { |
755 | /* pcpusec should be 0, and size of that section should be 0. */ | |
756 | BUG_ON(size != 0); | |
757 | } | |
10fad5e4 TH |
758 | bool is_module_percpu_address(unsigned long addr) |
759 | { | |
760 | return false; | |
761 | } | |
6b588c18 | 762 | |
383776fa TG |
763 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
764 | { | |
765 | return false; | |
766 | } | |
767 | ||
1da177e4 LT |
768 | #endif /* CONFIG_SMP */ |
769 | ||
c988d2b2 MD |
770 | #define MODINFO_ATTR(field) \ |
771 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
772 | { \ | |
773 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
774 | } \ | |
775 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 776 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 777 | { \ |
cc56ded3 | 778 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
779 | } \ |
780 | static int modinfo_##field##_exists(struct module *mod) \ | |
781 | { \ | |
782 | return mod->field != NULL; \ | |
783 | } \ | |
784 | static void free_modinfo_##field(struct module *mod) \ | |
785 | { \ | |
22a8bdeb DW |
786 | kfree(mod->field); \ |
787 | mod->field = NULL; \ | |
c988d2b2 MD |
788 | } \ |
789 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 790 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
791 | .show = show_modinfo_##field, \ |
792 | .setup = setup_modinfo_##field, \ | |
793 | .test = modinfo_##field##_exists, \ | |
794 | .free = free_modinfo_##field, \ | |
795 | }; | |
796 | ||
797 | MODINFO_ATTR(version); | |
798 | MODINFO_ATTR(srcversion); | |
799 | ||
e14af7ee AV |
800 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
801 | ||
03e88ae1 | 802 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
803 | |
804 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
805 | ||
e513cc1c MH |
806 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
807 | #define MODULE_REF_BASE 1 | |
808 | ||
1da177e4 | 809 | /* Init the unload section of the module. */ |
9f85a4bb | 810 | static int module_unload_init(struct module *mod) |
1da177e4 | 811 | { |
e513cc1c MH |
812 | /* |
813 | * Initialize reference counter to MODULE_REF_BASE. | |
814 | * refcnt == 0 means module is going. | |
815 | */ | |
816 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 817 | |
2c02dfe7 LT |
818 | INIT_LIST_HEAD(&mod->source_list); |
819 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 820 | |
1da177e4 | 821 | /* Hold reference count during initialization. */ |
e513cc1c | 822 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
823 | |
824 | return 0; | |
1da177e4 LT |
825 | } |
826 | ||
1da177e4 LT |
827 | /* Does a already use b? */ |
828 | static int already_uses(struct module *a, struct module *b) | |
829 | { | |
830 | struct module_use *use; | |
831 | ||
2c02dfe7 LT |
832 | list_for_each_entry(use, &b->source_list, source_list) { |
833 | if (use->source == a) { | |
5e124169 | 834 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
835 | return 1; |
836 | } | |
837 | } | |
5e124169 | 838 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
839 | return 0; |
840 | } | |
841 | ||
2c02dfe7 LT |
842 | /* |
843 | * Module a uses b | |
844 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
845 | * - the module_use is added to the list of 'b' sources (so | |
846 | * 'b' can walk the list to see who sourced them), and of 'a' | |
847 | * targets (so 'a' can see what modules it targets). | |
848 | */ | |
849 | static int add_module_usage(struct module *a, struct module *b) | |
850 | { | |
2c02dfe7 LT |
851 | struct module_use *use; |
852 | ||
5e124169 | 853 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 854 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 855 | if (!use) |
2c02dfe7 | 856 | return -ENOMEM; |
2c02dfe7 LT |
857 | |
858 | use->source = a; | |
859 | use->target = b; | |
860 | list_add(&use->source_list, &b->source_list); | |
861 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
862 | return 0; |
863 | } | |
864 | ||
75676500 | 865 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 866 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 867 | { |
c8e21ced | 868 | int err; |
270a6c4c | 869 | |
9bea7f23 | 870 | if (b == NULL || already_uses(a, b)) |
218ce735 | 871 | return 0; |
218ce735 | 872 | |
9bea7f23 RR |
873 | /* If module isn't available, we fail. */ |
874 | err = strong_try_module_get(b); | |
c9a3ba55 | 875 | if (err) |
9bea7f23 | 876 | return err; |
1da177e4 | 877 | |
2c02dfe7 LT |
878 | err = add_module_usage(a, b); |
879 | if (err) { | |
1da177e4 | 880 | module_put(b); |
9bea7f23 | 881 | return err; |
1da177e4 | 882 | } |
9bea7f23 | 883 | return 0; |
1da177e4 | 884 | } |
9bea7f23 | 885 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
886 | |
887 | /* Clear the unload stuff of the module. */ | |
888 | static void module_unload_free(struct module *mod) | |
889 | { | |
2c02dfe7 | 890 | struct module_use *use, *tmp; |
1da177e4 | 891 | |
75676500 | 892 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
893 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
894 | struct module *i = use->target; | |
5e124169 | 895 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
896 | module_put(i); |
897 | list_del(&use->source_list); | |
898 | list_del(&use->target_list); | |
899 | kfree(use); | |
1da177e4 | 900 | } |
75676500 | 901 | mutex_unlock(&module_mutex); |
1da177e4 LT |
902 | } |
903 | ||
904 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 905 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
906 | { |
907 | int ret = (flags & O_TRUNC); | |
908 | if (ret) | |
373d4d09 | 909 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
910 | return ret; |
911 | } | |
912 | #else | |
fb169793 | 913 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
914 | { |
915 | return 0; | |
916 | } | |
917 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
918 | ||
e513cc1c MH |
919 | /* Try to release refcount of module, 0 means success. */ |
920 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 921 | { |
e513cc1c | 922 | int ret; |
1da177e4 | 923 | |
e513cc1c MH |
924 | /* Try to decrement refcnt which we set at loading */ |
925 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
926 | BUG_ON(ret < 0); | |
927 | if (ret) | |
928 | /* Someone can put this right now, recover with checking */ | |
929 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 930 | |
e513cc1c MH |
931 | return ret; |
932 | } | |
1da177e4 | 933 | |
e513cc1c MH |
934 | static int try_stop_module(struct module *mod, int flags, int *forced) |
935 | { | |
da39ba5e | 936 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
937 | if (try_release_module_ref(mod) != 0) { |
938 | *forced = try_force_unload(flags); | |
939 | if (!(*forced)) | |
1da177e4 LT |
940 | return -EWOULDBLOCK; |
941 | } | |
942 | ||
943 | /* Mark it as dying. */ | |
e513cc1c | 944 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 945 | |
e513cc1c | 946 | return 0; |
1da177e4 LT |
947 | } |
948 | ||
d5db139a RR |
949 | /** |
950 | * module_refcount - return the refcount or -1 if unloading | |
951 | * | |
952 | * @mod: the module we're checking | |
953 | * | |
954 | * Returns: | |
955 | * -1 if the module is in the process of unloading | |
956 | * otherwise the number of references in the kernel to the module | |
957 | */ | |
958 | int module_refcount(struct module *mod) | |
1da177e4 | 959 | { |
d5db139a | 960 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
961 | } |
962 | EXPORT_SYMBOL(module_refcount); | |
963 | ||
964 | /* This exists whether we can unload or not */ | |
965 | static void free_module(struct module *mod); | |
966 | ||
17da2bd9 HC |
967 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
968 | unsigned int, flags) | |
1da177e4 LT |
969 | { |
970 | struct module *mod; | |
dfff0a06 | 971 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
972 | int ret, forced = 0; |
973 | ||
3d43321b | 974 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
975 | return -EPERM; |
976 | ||
977 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
978 | return -EFAULT; | |
979 | name[MODULE_NAME_LEN-1] = '\0'; | |
980 | ||
f6276ac9 RGB |
981 | audit_log_kern_module(name); |
982 | ||
3fc1f1e2 TH |
983 | if (mutex_lock_interruptible(&module_mutex) != 0) |
984 | return -EINTR; | |
1da177e4 LT |
985 | |
986 | mod = find_module(name); | |
987 | if (!mod) { | |
988 | ret = -ENOENT; | |
989 | goto out; | |
990 | } | |
991 | ||
2c02dfe7 | 992 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
993 | /* Other modules depend on us: get rid of them first. */ |
994 | ret = -EWOULDBLOCK; | |
995 | goto out; | |
996 | } | |
997 | ||
998 | /* Doing init or already dying? */ | |
999 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 1000 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 1001 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
1002 | ret = -EBUSY; |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 1007 | if (mod->init && !mod->exit) { |
fb169793 | 1008 | forced = try_force_unload(flags); |
1da177e4 LT |
1009 | if (!forced) { |
1010 | /* This module can't be removed */ | |
1011 | ret = -EBUSY; | |
1012 | goto out; | |
1013 | } | |
1014 | } | |
1015 | ||
1da177e4 LT |
1016 | /* Stop the machine so refcounts can't move and disable module. */ |
1017 | ret = try_stop_module(mod, flags, &forced); | |
1018 | if (ret != 0) | |
1019 | goto out; | |
1020 | ||
df4b565e | 1021 | mutex_unlock(&module_mutex); |
25985edc | 1022 | /* Final destruction now no one is using it. */ |
df4b565e | 1023 | if (mod->exit != NULL) |
1da177e4 | 1024 | mod->exit(); |
df4b565e PO |
1025 | blocking_notifier_call_chain(&module_notify_list, |
1026 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1027 | klp_module_going(mod); |
7dcd182b JY |
1028 | ftrace_release_mod(mod); |
1029 | ||
22a9d645 | 1030 | async_synchronize_full(); |
75676500 | 1031 | |
e14af7ee | 1032 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1033 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1034 | |
75676500 RR |
1035 | free_module(mod); |
1036 | return 0; | |
1037 | out: | |
6389a385 | 1038 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1039 | return ret; |
1040 | } | |
1041 | ||
d1e99d7a | 1042 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1043 | { |
1044 | struct module_use *use; | |
1045 | int printed_something = 0; | |
1046 | ||
d5db139a | 1047 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1048 | |
6da0b565 IA |
1049 | /* |
1050 | * Always include a trailing , so userspace can differentiate | |
1051 | * between this and the old multi-field proc format. | |
1052 | */ | |
2c02dfe7 | 1053 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1054 | printed_something = 1; |
2c02dfe7 | 1055 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1056 | } |
1057 | ||
1da177e4 LT |
1058 | if (mod->init != NULL && mod->exit == NULL) { |
1059 | printed_something = 1; | |
6da0b565 | 1060 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1061 | } |
1062 | ||
1063 | if (!printed_something) | |
6da0b565 | 1064 | seq_puts(m, "-"); |
1da177e4 LT |
1065 | } |
1066 | ||
1067 | void __symbol_put(const char *symbol) | |
1068 | { | |
1069 | struct module *owner; | |
1da177e4 | 1070 | |
24da1cbf | 1071 | preempt_disable(); |
414fd31b | 1072 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1073 | BUG(); |
1074 | module_put(owner); | |
24da1cbf | 1075 | preempt_enable(); |
1da177e4 LT |
1076 | } |
1077 | EXPORT_SYMBOL(__symbol_put); | |
1078 | ||
7d1d16e4 | 1079 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1080 | void symbol_put_addr(void *addr) |
1081 | { | |
5e376613 | 1082 | struct module *modaddr; |
7d1d16e4 | 1083 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1084 | |
7d1d16e4 | 1085 | if (core_kernel_text(a)) |
5e376613 | 1086 | return; |
1da177e4 | 1087 | |
275d7d44 PZ |
1088 | /* |
1089 | * Even though we hold a reference on the module; we still need to | |
1090 | * disable preemption in order to safely traverse the data structure. | |
1091 | */ | |
1092 | preempt_disable(); | |
7d1d16e4 | 1093 | modaddr = __module_text_address(a); |
a6e6abd5 | 1094 | BUG_ON(!modaddr); |
5e376613 | 1095 | module_put(modaddr); |
275d7d44 | 1096 | preempt_enable(); |
1da177e4 LT |
1097 | } |
1098 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1099 | ||
1100 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1101 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1102 | { |
d5db139a | 1103 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1104 | } |
1105 | ||
cca3e707 KS |
1106 | static struct module_attribute modinfo_refcnt = |
1107 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1108 | |
d53799be SR |
1109 | void __module_get(struct module *module) |
1110 | { | |
1111 | if (module) { | |
1112 | preempt_disable(); | |
2f35c41f | 1113 | atomic_inc(&module->refcnt); |
d53799be SR |
1114 | trace_module_get(module, _RET_IP_); |
1115 | preempt_enable(); | |
1116 | } | |
1117 | } | |
1118 | EXPORT_SYMBOL(__module_get); | |
1119 | ||
1120 | bool try_module_get(struct module *module) | |
1121 | { | |
1122 | bool ret = true; | |
1123 | ||
1124 | if (module) { | |
1125 | preempt_disable(); | |
e513cc1c MH |
1126 | /* Note: here, we can fail to get a reference */ |
1127 | if (likely(module_is_live(module) && | |
1128 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1129 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1130 | else |
d53799be SR |
1131 | ret = false; |
1132 | ||
1133 | preempt_enable(); | |
1134 | } | |
1135 | return ret; | |
1136 | } | |
1137 | EXPORT_SYMBOL(try_module_get); | |
1138 | ||
f6a57033 AV |
1139 | void module_put(struct module *module) |
1140 | { | |
e513cc1c MH |
1141 | int ret; |
1142 | ||
f6a57033 | 1143 | if (module) { |
e1783a24 | 1144 | preempt_disable(); |
e513cc1c MH |
1145 | ret = atomic_dec_if_positive(&module->refcnt); |
1146 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1147 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1148 | preempt_enable(); |
f6a57033 AV |
1149 | } |
1150 | } | |
1151 | EXPORT_SYMBOL(module_put); | |
1152 | ||
1da177e4 | 1153 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1154 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1155 | { |
1156 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1157 | seq_puts(m, " - -"); |
1da177e4 LT |
1158 | } |
1159 | ||
1160 | static inline void module_unload_free(struct module *mod) | |
1161 | { | |
1162 | } | |
1163 | ||
9bea7f23 | 1164 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1165 | { |
9bea7f23 | 1166 | return strong_try_module_get(b); |
1da177e4 | 1167 | } |
9bea7f23 | 1168 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1169 | |
9f85a4bb | 1170 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1171 | { |
9f85a4bb | 1172 | return 0; |
1da177e4 LT |
1173 | } |
1174 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1175 | ||
53999bf3 KW |
1176 | static size_t module_flags_taint(struct module *mod, char *buf) |
1177 | { | |
1178 | size_t l = 0; | |
7fd8329b PM |
1179 | int i; |
1180 | ||
1181 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1182 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1183 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1184 | } |
53999bf3 | 1185 | |
53999bf3 KW |
1186 | return l; |
1187 | } | |
1188 | ||
1f71740a | 1189 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1190 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1191 | { |
1192 | const char *state = "unknown"; | |
1193 | ||
4befb026 | 1194 | switch (mk->mod->state) { |
1f71740a KS |
1195 | case MODULE_STATE_LIVE: |
1196 | state = "live"; | |
1197 | break; | |
1198 | case MODULE_STATE_COMING: | |
1199 | state = "coming"; | |
1200 | break; | |
1201 | case MODULE_STATE_GOING: | |
1202 | state = "going"; | |
1203 | break; | |
0d21b0e3 RR |
1204 | default: |
1205 | BUG(); | |
1f71740a KS |
1206 | } |
1207 | return sprintf(buffer, "%s\n", state); | |
1208 | } | |
1209 | ||
cca3e707 KS |
1210 | static struct module_attribute modinfo_initstate = |
1211 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1212 | |
88bfa324 KS |
1213 | static ssize_t store_uevent(struct module_attribute *mattr, |
1214 | struct module_kobject *mk, | |
1215 | const char *buffer, size_t count) | |
1216 | { | |
df44b479 PR |
1217 | int rc; |
1218 | ||
1219 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1220 | return rc ? rc : count; | |
88bfa324 KS |
1221 | } |
1222 | ||
cca3e707 KS |
1223 | struct module_attribute module_uevent = |
1224 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1225 | ||
1226 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1227 | struct module_kobject *mk, char *buffer) | |
1228 | { | |
7523e4dc | 1229 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1230 | } |
1231 | ||
1232 | static struct module_attribute modinfo_coresize = | |
1233 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1234 | ||
1235 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1236 | struct module_kobject *mk, char *buffer) | |
1237 | { | |
7523e4dc | 1238 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1239 | } |
1240 | ||
1241 | static struct module_attribute modinfo_initsize = | |
1242 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1243 | ||
1244 | static ssize_t show_taint(struct module_attribute *mattr, | |
1245 | struct module_kobject *mk, char *buffer) | |
1246 | { | |
1247 | size_t l; | |
1248 | ||
1249 | l = module_flags_taint(mk->mod, buffer); | |
1250 | buffer[l++] = '\n'; | |
1251 | return l; | |
1252 | } | |
1253 | ||
1254 | static struct module_attribute modinfo_taint = | |
1255 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1256 | |
03e88ae1 | 1257 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1258 | &module_uevent, |
03e88ae1 GKH |
1259 | &modinfo_version, |
1260 | &modinfo_srcversion, | |
cca3e707 KS |
1261 | &modinfo_initstate, |
1262 | &modinfo_coresize, | |
1263 | &modinfo_initsize, | |
1264 | &modinfo_taint, | |
03e88ae1 | 1265 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1266 | &modinfo_refcnt, |
03e88ae1 GKH |
1267 | #endif |
1268 | NULL, | |
1269 | }; | |
1270 | ||
1da177e4 LT |
1271 | static const char vermagic[] = VERMAGIC_STRING; |
1272 | ||
c6e665c8 | 1273 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1274 | { |
1275 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1276 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1277 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1278 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1279 | return 0; |
1280 | #else | |
1281 | return -ENOEXEC; | |
1282 | #endif | |
1283 | } | |
1284 | ||
1da177e4 | 1285 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1286 | |
1287 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1288 | { |
71810db2 | 1289 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1290 | } |
1291 | ||
49019426 | 1292 | static int check_version(const struct load_info *info, |
1da177e4 | 1293 | const char *symname, |
6da0b565 | 1294 | struct module *mod, |
71810db2 | 1295 | const s32 *crc) |
1da177e4 | 1296 | { |
49019426 KC |
1297 | Elf_Shdr *sechdrs = info->sechdrs; |
1298 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1299 | unsigned int i, num_versions; |
1300 | struct modversion_info *versions; | |
1301 | ||
1302 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1303 | if (!crc) | |
1304 | return 1; | |
1305 | ||
a5dd6970 RR |
1306 | /* No versions at all? modprobe --force does this. */ |
1307 | if (versindex == 0) | |
1308 | return try_to_force_load(mod, symname) == 0; | |
1309 | ||
1da177e4 LT |
1310 | versions = (void *) sechdrs[versindex].sh_addr; |
1311 | num_versions = sechdrs[versindex].sh_size | |
1312 | / sizeof(struct modversion_info); | |
1313 | ||
1314 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1315 | u32 crcval; |
1316 | ||
1da177e4 LT |
1317 | if (strcmp(versions[i].name, symname) != 0) |
1318 | continue; | |
1319 | ||
71810db2 AB |
1320 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1321 | crcval = resolve_rel_crc(crc); | |
1322 | else | |
1323 | crcval = *crc; | |
1324 | if (versions[i].crc == crcval) | |
1da177e4 | 1325 | return 1; |
71810db2 AB |
1326 | pr_debug("Found checksum %X vs module %lX\n", |
1327 | crcval, versions[i].crc); | |
826e4506 | 1328 | goto bad_version; |
1da177e4 | 1329 | } |
826e4506 | 1330 | |
faaae2a5 | 1331 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1332 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1333 | return 1; |
826e4506 LT |
1334 | |
1335 | bad_version: | |
6da0b565 | 1336 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1337 | info->name, symname); |
826e4506 | 1338 | return 0; |
1da177e4 LT |
1339 | } |
1340 | ||
49019426 | 1341 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1342 | struct module *mod) |
1343 | { | |
71810db2 | 1344 | const s32 *crc; |
1da177e4 | 1345 | |
926a59b1 PZ |
1346 | /* |
1347 | * Since this should be found in kernel (which can't be removed), no | |
1348 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1349 | */ | |
1350 | preempt_disable(); | |
996302c5 | 1351 | if (!find_symbol("module_layout", NULL, &crc, true, false)) { |
926a59b1 | 1352 | preempt_enable(); |
1da177e4 | 1353 | BUG(); |
926a59b1 PZ |
1354 | } |
1355 | preempt_enable(); | |
996302c5 | 1356 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1357 | } |
1358 | ||
91e37a79 RR |
1359 | /* First part is kernel version, which we ignore if module has crcs. */ |
1360 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1361 | bool has_crcs) | |
1da177e4 | 1362 | { |
91e37a79 RR |
1363 | if (has_crcs) { |
1364 | amagic += strcspn(amagic, " "); | |
1365 | bmagic += strcspn(bmagic, " "); | |
1366 | } | |
1da177e4 LT |
1367 | return strcmp(amagic, bmagic) == 0; |
1368 | } | |
1369 | #else | |
49019426 | 1370 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1371 | const char *symname, |
6da0b565 | 1372 | struct module *mod, |
71810db2 | 1373 | const s32 *crc) |
1da177e4 LT |
1374 | { |
1375 | return 1; | |
1376 | } | |
1377 | ||
49019426 | 1378 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1379 | struct module *mod) |
1380 | { | |
1381 | return 1; | |
1382 | } | |
1383 | ||
91e37a79 RR |
1384 | static inline int same_magic(const char *amagic, const char *bmagic, |
1385 | bool has_crcs) | |
1da177e4 LT |
1386 | { |
1387 | return strcmp(amagic, bmagic) == 0; | |
1388 | } | |
1389 | #endif /* CONFIG_MODVERSIONS */ | |
1390 | ||
8651ec01 MM |
1391 | static char *get_modinfo(const struct load_info *info, const char *tag); |
1392 | static char *get_next_modinfo(const struct load_info *info, const char *tag, | |
1393 | char *prev); | |
1394 | ||
1395 | static int verify_namespace_is_imported(const struct load_info *info, | |
1396 | const struct kernel_symbol *sym, | |
1397 | struct module *mod) | |
1398 | { | |
1399 | const char *namespace; | |
1400 | char *imported_namespace; | |
1401 | ||
1402 | namespace = kernel_symbol_namespace(sym); | |
1403 | if (namespace) { | |
1404 | imported_namespace = get_modinfo(info, "import_ns"); | |
1405 | while (imported_namespace) { | |
1406 | if (strcmp(namespace, imported_namespace) == 0) | |
1407 | return 0; | |
1408 | imported_namespace = get_next_modinfo( | |
1409 | info, "import_ns", imported_namespace); | |
1410 | } | |
3d52ec5e MM |
1411 | #ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
1412 | pr_warn( | |
1413 | #else | |
1414 | pr_err( | |
1415 | #endif | |
1416 | "%s: module uses symbol (%s) from namespace %s, but does not import it.\n", | |
1417 | mod->name, kernel_symbol_name(sym), namespace); | |
1418 | #ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS | |
8651ec01 | 1419 | return -EINVAL; |
3d52ec5e | 1420 | #endif |
8651ec01 MM |
1421 | } |
1422 | return 0; | |
1423 | } | |
1424 | ||
1425 | ||
75676500 | 1426 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1427 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1428 | const struct load_info *info, | |
414fd31b | 1429 | const char *name, |
9bea7f23 | 1430 | char ownername[]) |
1da177e4 LT |
1431 | { |
1432 | struct module *owner; | |
414fd31b | 1433 | const struct kernel_symbol *sym; |
71810db2 | 1434 | const s32 *crc; |
9bea7f23 | 1435 | int err; |
1da177e4 | 1436 | |
d64810f5 PZ |
1437 | /* |
1438 | * The module_mutex should not be a heavily contended lock; | |
1439 | * if we get the occasional sleep here, we'll go an extra iteration | |
1440 | * in the wait_event_interruptible(), which is harmless. | |
1441 | */ | |
1442 | sched_annotate_sleep(); | |
75676500 | 1443 | mutex_lock(&module_mutex); |
414fd31b | 1444 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1445 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1446 | if (!sym) |
1447 | goto unlock; | |
1448 | ||
49019426 | 1449 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1450 | sym = ERR_PTR(-EINVAL); |
1451 | goto getname; | |
1da177e4 | 1452 | } |
9bea7f23 | 1453 | |
8651ec01 MM |
1454 | err = verify_namespace_is_imported(info, sym, mod); |
1455 | if (err) { | |
1456 | sym = ERR_PTR(err); | |
1457 | goto getname; | |
1458 | } | |
1459 | ||
9bea7f23 RR |
1460 | err = ref_module(mod, owner); |
1461 | if (err) { | |
1462 | sym = ERR_PTR(err); | |
1463 | goto getname; | |
1464 | } | |
1465 | ||
1466 | getname: | |
1467 | /* We must make copy under the lock if we failed to get ref. */ | |
1468 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1469 | unlock: | |
75676500 | 1470 | mutex_unlock(&module_mutex); |
218ce735 | 1471 | return sym; |
1da177e4 LT |
1472 | } |
1473 | ||
49668688 RR |
1474 | static const struct kernel_symbol * |
1475 | resolve_symbol_wait(struct module *mod, | |
1476 | const struct load_info *info, | |
1477 | const char *name) | |
9bea7f23 RR |
1478 | { |
1479 | const struct kernel_symbol *ksym; | |
49668688 | 1480 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1481 | |
1482 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1483 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1484 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1485 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1486 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1487 | mod->name, owner); | |
9bea7f23 RR |
1488 | } |
1489 | return ksym; | |
1490 | } | |
1491 | ||
1da177e4 LT |
1492 | /* |
1493 | * /sys/module/foo/sections stuff | |
1494 | * J. Corbet <corbet@lwn.net> | |
1495 | */ | |
8f6d0378 | 1496 | #ifdef CONFIG_SYSFS |
10b465aa | 1497 | |
8f6d0378 | 1498 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1499 | static inline bool sect_empty(const Elf_Shdr *sect) |
1500 | { | |
1501 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1502 | } | |
1503 | ||
6da0b565 | 1504 | struct module_sect_attr { |
a58730c4 RR |
1505 | struct module_attribute mattr; |
1506 | char *name; | |
1507 | unsigned long address; | |
1508 | }; | |
1509 | ||
6da0b565 | 1510 | struct module_sect_attrs { |
a58730c4 RR |
1511 | struct attribute_group grp; |
1512 | unsigned int nsections; | |
1513 | struct module_sect_attr attrs[0]; | |
1514 | }; | |
1515 | ||
1da177e4 | 1516 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1517 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1518 | { |
1519 | struct module_sect_attr *sattr = | |
1520 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1521 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1522 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1523 | } |
1524 | ||
04b1db9f IN |
1525 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1526 | { | |
a58730c4 | 1527 | unsigned int section; |
04b1db9f IN |
1528 | |
1529 | for (section = 0; section < sect_attrs->nsections; section++) | |
1530 | kfree(sect_attrs->attrs[section].name); | |
1531 | kfree(sect_attrs); | |
1532 | } | |
1533 | ||
8f6d0378 | 1534 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1535 | { |
1536 | unsigned int nloaded = 0, i, size[2]; | |
1537 | struct module_sect_attrs *sect_attrs; | |
1538 | struct module_sect_attr *sattr; | |
1539 | struct attribute **gattr; | |
22a8bdeb | 1540 | |
1da177e4 | 1541 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1542 | for (i = 0; i < info->hdr->e_shnum; i++) |
1543 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 | 1544 | nloaded++; |
8d1b73dd | 1545 | size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
1da177e4 LT |
1546 | sizeof(sect_attrs->grp.attrs[0])); |
1547 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1548 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1549 | if (sect_attrs == NULL) | |
1da177e4 LT |
1550 | return; |
1551 | ||
1552 | /* Setup section attributes. */ | |
1553 | sect_attrs->grp.name = "sections"; | |
1554 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1555 | ||
04b1db9f | 1556 | sect_attrs->nsections = 0; |
1da177e4 LT |
1557 | sattr = §_attrs->attrs[0]; |
1558 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1559 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1560 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1561 | if (sect_empty(sec)) | |
35dead42 | 1562 | continue; |
8f6d0378 RR |
1563 | sattr->address = sec->sh_addr; |
1564 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1565 | GFP_KERNEL); |
1566 | if (sattr->name == NULL) | |
1567 | goto out; | |
1568 | sect_attrs->nsections++; | |
361795b1 | 1569 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1570 | sattr->mattr.show = module_sect_show; |
1571 | sattr->mattr.store = NULL; | |
1572 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1573 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1574 | *(gattr++) = &(sattr++)->mattr.attr; |
1575 | } | |
1576 | *gattr = NULL; | |
1577 | ||
1578 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1579 | goto out; | |
1580 | ||
1581 | mod->sect_attrs = sect_attrs; | |
1582 | return; | |
1583 | out: | |
04b1db9f | 1584 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1585 | } |
1586 | ||
1587 | static void remove_sect_attrs(struct module *mod) | |
1588 | { | |
1589 | if (mod->sect_attrs) { | |
1590 | sysfs_remove_group(&mod->mkobj.kobj, | |
1591 | &mod->sect_attrs->grp); | |
1592 | /* We are positive that no one is using any sect attrs | |
1593 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1594 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1595 | mod->sect_attrs = NULL; |
1596 | } | |
1597 | } | |
1598 | ||
6d760133 RM |
1599 | /* |
1600 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1601 | */ | |
1602 | ||
1603 | struct module_notes_attrs { | |
1604 | struct kobject *dir; | |
1605 | unsigned int notes; | |
1606 | struct bin_attribute attrs[0]; | |
1607 | }; | |
1608 | ||
2c3c8bea | 1609 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1610 | struct bin_attribute *bin_attr, |
1611 | char *buf, loff_t pos, size_t count) | |
1612 | { | |
1613 | /* | |
1614 | * The caller checked the pos and count against our size. | |
1615 | */ | |
1616 | memcpy(buf, bin_attr->private + pos, count); | |
1617 | return count; | |
1618 | } | |
1619 | ||
1620 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1621 | unsigned int i) | |
1622 | { | |
1623 | if (notes_attrs->dir) { | |
1624 | while (i-- > 0) | |
1625 | sysfs_remove_bin_file(notes_attrs->dir, | |
1626 | ¬es_attrs->attrs[i]); | |
e9432093 | 1627 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1628 | } |
1629 | kfree(notes_attrs); | |
1630 | } | |
1631 | ||
8f6d0378 | 1632 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1633 | { |
1634 | unsigned int notes, loaded, i; | |
1635 | struct module_notes_attrs *notes_attrs; | |
1636 | struct bin_attribute *nattr; | |
1637 | ||
ea6bff36 IM |
1638 | /* failed to create section attributes, so can't create notes */ |
1639 | if (!mod->sect_attrs) | |
1640 | return; | |
1641 | ||
6d760133 RM |
1642 | /* Count notes sections and allocate structures. */ |
1643 | notes = 0; | |
8f6d0378 RR |
1644 | for (i = 0; i < info->hdr->e_shnum; i++) |
1645 | if (!sect_empty(&info->sechdrs[i]) && | |
1646 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1647 | ++notes; |
1648 | ||
1649 | if (notes == 0) | |
1650 | return; | |
1651 | ||
acafe7e3 | 1652 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1653 | GFP_KERNEL); |
1654 | if (notes_attrs == NULL) | |
1655 | return; | |
1656 | ||
1657 | notes_attrs->notes = notes; | |
1658 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1659 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1660 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1661 | continue; |
8f6d0378 | 1662 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1663 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1664 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1665 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1666 | nattr->size = info->sechdrs[i].sh_size; |
1667 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1668 | nattr->read = module_notes_read; |
1669 | ++nattr; | |
1670 | } | |
1671 | ++loaded; | |
1672 | } | |
1673 | ||
4ff6abff | 1674 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1675 | if (!notes_attrs->dir) |
1676 | goto out; | |
1677 | ||
1678 | for (i = 0; i < notes; ++i) | |
1679 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1680 | ¬es_attrs->attrs[i])) | |
1681 | goto out; | |
1682 | ||
1683 | mod->notes_attrs = notes_attrs; | |
1684 | return; | |
1685 | ||
1686 | out: | |
1687 | free_notes_attrs(notes_attrs, i); | |
1688 | } | |
1689 | ||
1690 | static void remove_notes_attrs(struct module *mod) | |
1691 | { | |
1692 | if (mod->notes_attrs) | |
1693 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1694 | } | |
1695 | ||
1da177e4 | 1696 | #else |
04b1db9f | 1697 | |
8f6d0378 RR |
1698 | static inline void add_sect_attrs(struct module *mod, |
1699 | const struct load_info *info) | |
1da177e4 LT |
1700 | { |
1701 | } | |
1702 | ||
1703 | static inline void remove_sect_attrs(struct module *mod) | |
1704 | { | |
1705 | } | |
6d760133 | 1706 | |
8f6d0378 RR |
1707 | static inline void add_notes_attrs(struct module *mod, |
1708 | const struct load_info *info) | |
6d760133 RM |
1709 | { |
1710 | } | |
1711 | ||
1712 | static inline void remove_notes_attrs(struct module *mod) | |
1713 | { | |
1714 | } | |
8f6d0378 | 1715 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1716 | |
1ba5c08b | 1717 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1718 | { |
1719 | #ifdef CONFIG_MODULE_UNLOAD | |
1720 | struct module_use *use; | |
80a3d1bb | 1721 | |
75676500 | 1722 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1723 | list_for_each_entry(use, &mod->target_list, target_list) |
1724 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1725 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1726 | #endif |
1727 | } | |
1728 | ||
1ba5c08b | 1729 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1730 | { |
1ba5c08b | 1731 | int ret = 0; |
80a3d1bb RR |
1732 | #ifdef CONFIG_MODULE_UNLOAD |
1733 | struct module_use *use; | |
1734 | ||
75676500 | 1735 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1736 | list_for_each_entry(use, &mod->target_list, target_list) { |
1737 | ret = sysfs_create_link(use->target->holders_dir, | |
1738 | &mod->mkobj.kobj, mod->name); | |
1739 | if (ret) | |
1740 | break; | |
1741 | } | |
75676500 | 1742 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1743 | if (ret) |
1744 | del_usage_links(mod); | |
80a3d1bb | 1745 | #endif |
1ba5c08b | 1746 | return ret; |
80a3d1bb RR |
1747 | } |
1748 | ||
bc6f2a75 Y |
1749 | static void module_remove_modinfo_attrs(struct module *mod, int end); |
1750 | ||
6407ebb2 | 1751 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1752 | { |
1753 | struct module_attribute *attr; | |
03e88ae1 | 1754 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1755 | int error = 0; |
1756 | int i; | |
1757 | ||
03e88ae1 GKH |
1758 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1759 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1760 | GFP_KERNEL); | |
1761 | if (!mod->modinfo_attrs) | |
1762 | return -ENOMEM; | |
1763 | ||
1764 | temp_attr = mod->modinfo_attrs; | |
bc6f2a75 | 1765 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
c75b590d | 1766 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1767 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1768 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1769 | error = sysfs_create_file(&mod->mkobj.kobj, |
1770 | &temp_attr->attr); | |
bc6f2a75 Y |
1771 | if (error) |
1772 | goto error_out; | |
03e88ae1 GKH |
1773 | ++temp_attr; |
1774 | } | |
c988d2b2 | 1775 | } |
bc6f2a75 Y |
1776 | |
1777 | return 0; | |
1778 | ||
1779 | error_out: | |
1780 | if (i > 0) | |
1781 | module_remove_modinfo_attrs(mod, --i); | |
c988d2b2 MD |
1782 | return error; |
1783 | } | |
1784 | ||
bc6f2a75 | 1785 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
c988d2b2 MD |
1786 | { |
1787 | struct module_attribute *attr; | |
1788 | int i; | |
1789 | ||
03e88ae1 | 1790 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
bc6f2a75 Y |
1791 | if (end >= 0 && i > end) |
1792 | break; | |
03e88ae1 GKH |
1793 | /* pick a field to test for end of list */ |
1794 | if (!attr->attr.name) | |
1795 | break; | |
6da0b565 | 1796 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1797 | if (attr->free) |
1798 | attr->free(mod); | |
c988d2b2 | 1799 | } |
03e88ae1 | 1800 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1801 | } |
1da177e4 | 1802 | |
942e4431 LZ |
1803 | static void mod_kobject_put(struct module *mod) |
1804 | { | |
1805 | DECLARE_COMPLETION_ONSTACK(c); | |
1806 | mod->mkobj.kobj_completion = &c; | |
1807 | kobject_put(&mod->mkobj.kobj); | |
1808 | wait_for_completion(&c); | |
1809 | } | |
1810 | ||
6407ebb2 | 1811 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1812 | { |
1813 | int err; | |
6494a93d | 1814 | struct kobject *kobj; |
1da177e4 | 1815 | |
823bccfc | 1816 | if (!module_sysfs_initialized) { |
bddb12b3 | 1817 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1818 | err = -EINVAL; |
1819 | goto out; | |
1820 | } | |
6494a93d GKH |
1821 | |
1822 | kobj = kset_find_obj(module_kset, mod->name); | |
1823 | if (kobj) { | |
bddb12b3 | 1824 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1825 | kobject_put(kobj); |
1826 | err = -EINVAL; | |
1827 | goto out; | |
1828 | } | |
1829 | ||
1da177e4 | 1830 | mod->mkobj.mod = mod; |
e17e0f51 | 1831 | |
ac3c8141 GKH |
1832 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1833 | mod->mkobj.kobj.kset = module_kset; | |
1834 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1835 | "%s", mod->name); | |
1836 | if (err) | |
942e4431 | 1837 | mod_kobject_put(mod); |
270a6c4c | 1838 | |
97c146ef | 1839 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1840 | out: |
1841 | return err; | |
1842 | } | |
1843 | ||
6407ebb2 | 1844 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1845 | const struct load_info *info, |
270a6c4c KS |
1846 | struct kernel_param *kparam, |
1847 | unsigned int num_params) | |
1848 | { | |
1849 | int err; | |
1850 | ||
80a3d1bb RR |
1851 | err = mod_sysfs_init(mod); |
1852 | if (err) | |
1853 | goto out; | |
1854 | ||
4ff6abff | 1855 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1856 | if (!mod->holders_dir) { |
1857 | err = -ENOMEM; | |
270a6c4c | 1858 | goto out_unreg; |
240936e1 | 1859 | } |
270a6c4c | 1860 | |
1da177e4 LT |
1861 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1862 | if (err) | |
270a6c4c | 1863 | goto out_unreg_holders; |
1da177e4 | 1864 | |
c988d2b2 MD |
1865 | err = module_add_modinfo_attrs(mod); |
1866 | if (err) | |
e17e0f51 | 1867 | goto out_unreg_param; |
c988d2b2 | 1868 | |
1ba5c08b CL |
1869 | err = add_usage_links(mod); |
1870 | if (err) | |
1871 | goto out_unreg_modinfo_attrs; | |
1872 | ||
8f6d0378 RR |
1873 | add_sect_attrs(mod, info); |
1874 | add_notes_attrs(mod, info); | |
80a3d1bb | 1875 | |
e17e0f51 | 1876 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1877 | return 0; |
1878 | ||
1ba5c08b | 1879 | out_unreg_modinfo_attrs: |
bc6f2a75 | 1880 | module_remove_modinfo_attrs(mod, -1); |
e17e0f51 KS |
1881 | out_unreg_param: |
1882 | module_param_sysfs_remove(mod); | |
270a6c4c | 1883 | out_unreg_holders: |
78a2d906 | 1884 | kobject_put(mod->holders_dir); |
270a6c4c | 1885 | out_unreg: |
942e4431 | 1886 | mod_kobject_put(mod); |
80a3d1bb | 1887 | out: |
1da177e4 LT |
1888 | return err; |
1889 | } | |
34e4e2fe DL |
1890 | |
1891 | static void mod_sysfs_fini(struct module *mod) | |
1892 | { | |
8f6d0378 RR |
1893 | remove_notes_attrs(mod); |
1894 | remove_sect_attrs(mod); | |
942e4431 | 1895 | mod_kobject_put(mod); |
34e4e2fe DL |
1896 | } |
1897 | ||
cf2fde7b RR |
1898 | static void init_param_lock(struct module *mod) |
1899 | { | |
1900 | mutex_init(&mod->param_lock); | |
1901 | } | |
8f6d0378 | 1902 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1903 | |
8f6d0378 RR |
1904 | static int mod_sysfs_setup(struct module *mod, |
1905 | const struct load_info *info, | |
6407ebb2 RR |
1906 | struct kernel_param *kparam, |
1907 | unsigned int num_params) | |
1908 | { | |
1909 | return 0; | |
1910 | } | |
1911 | ||
34e4e2fe DL |
1912 | static void mod_sysfs_fini(struct module *mod) |
1913 | { | |
1914 | } | |
1915 | ||
bc6f2a75 | 1916 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
36b0360d RR |
1917 | { |
1918 | } | |
1919 | ||
80a3d1bb RR |
1920 | static void del_usage_links(struct module *mod) |
1921 | { | |
1922 | } | |
1923 | ||
cf2fde7b RR |
1924 | static void init_param_lock(struct module *mod) |
1925 | { | |
1926 | } | |
34e4e2fe | 1927 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1928 | |
36b0360d | 1929 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1930 | { |
80a3d1bb | 1931 | del_usage_links(mod); |
bc6f2a75 | 1932 | module_remove_modinfo_attrs(mod, -1); |
1da177e4 | 1933 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1934 | kobject_put(mod->mkobj.drivers_dir); |
1935 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1936 | mod_sysfs_fini(mod); |
1da177e4 LT |
1937 | } |
1938 | ||
93651f80 | 1939 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb | 1940 | /* |
1941 | * LKM RO/NX protection: protect module's text/ro-data | |
1942 | * from modification and any data from execution. | |
85c898db RR |
1943 | * |
1944 | * General layout of module is: | |
444d13ff JY |
1945 | * [text] [read-only-data] [ro-after-init] [writable data] |
1946 | * text_size -----^ ^ ^ ^ | |
1947 | * ro_size ------------------------| | | | |
1948 | * ro_after_init_size -----------------------------| | | |
1949 | * size -----------------------------------------------------------| | |
85c898db RR |
1950 | * |
1951 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1952 | */ |
85c898db RR |
1953 | static void frob_text(const struct module_layout *layout, |
1954 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1955 | { |
85c898db RR |
1956 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1957 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1958 | set_memory((unsigned long)layout->base, | |
1959 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1960 | } |
84e1c6bb | 1961 | |
93651f80 | 1962 | #ifdef CONFIG_STRICT_MODULE_RWX |
85c898db RR |
1963 | static void frob_rodata(const struct module_layout *layout, |
1964 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1965 | { |
85c898db RR |
1966 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1967 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1968 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1969 | set_memory((unsigned long)layout->base + layout->text_size, | |
1970 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb | 1971 | } |
1972 | ||
444d13ff JY |
1973 | static void frob_ro_after_init(const struct module_layout *layout, |
1974 | int (*set_memory)(unsigned long start, int num_pages)) | |
1975 | { | |
1976 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1977 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1978 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1979 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1980 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1981 | } | |
1982 | ||
85c898db RR |
1983 | static void frob_writable_data(const struct module_layout *layout, |
1984 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1985 | { |
85c898db | 1986 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1987 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1988 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1989 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1990 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1991 | } |
84e1c6bb | 1992 | |
85c898db RR |
1993 | /* livepatching wants to disable read-only so it can frob module. */ |
1994 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1995 | { |
39290b38 AT |
1996 | if (!rodata_enabled) |
1997 | return; | |
1998 | ||
85c898db RR |
1999 | frob_text(&mod->core_layout, set_memory_rw); |
2000 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 2001 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
2002 | frob_text(&mod->init_layout, set_memory_rw); |
2003 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 2004 | } |
84e1c6bb | 2005 | |
444d13ff | 2006 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 2007 | { |
39290b38 AT |
2008 | if (!rodata_enabled) |
2009 | return; | |
2010 | ||
1a7b7d92 RE |
2011 | set_vm_flush_reset_perms(mod->core_layout.base); |
2012 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 2013 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 2014 | |
85c898db RR |
2015 | frob_rodata(&mod->core_layout, set_memory_ro); |
2016 | frob_text(&mod->init_layout, set_memory_ro); | |
2017 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
2018 | |
2019 | if (after_init) | |
2020 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb | 2021 | } |
2022 | ||
85c898db | 2023 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 2024 | { |
85c898db | 2025 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 2026 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
2027 | frob_writable_data(&mod->core_layout, set_memory_nx); |
2028 | frob_rodata(&mod->init_layout, set_memory_nx); | |
2029 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
2030 | } |
2031 | ||
84e1c6bb | 2032 | /* Iterate through all modules and set each module's text as RW */ |
5d05c708 | 2033 | void set_all_modules_text_rw(void) |
84e1c6bb | 2034 | { |
2035 | struct module *mod; | |
2036 | ||
39290b38 AT |
2037 | if (!rodata_enabled) |
2038 | return; | |
2039 | ||
84e1c6bb | 2040 | mutex_lock(&module_mutex); |
2041 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
2042 | if (mod->state == MODULE_STATE_UNFORMED) |
2043 | continue; | |
85c898db RR |
2044 | |
2045 | frob_text(&mod->core_layout, set_memory_rw); | |
2046 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb | 2047 | } |
2048 | mutex_unlock(&module_mutex); | |
2049 | } | |
2050 | ||
2051 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 2052 | void set_all_modules_text_ro(void) |
84e1c6bb | 2053 | { |
2054 | struct module *mod; | |
2055 | ||
39290b38 AT |
2056 | if (!rodata_enabled) |
2057 | return; | |
2058 | ||
84e1c6bb | 2059 | mutex_lock(&module_mutex); |
2060 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
2061 | /* |
2062 | * Ignore going modules since it's possible that ro | |
2063 | * protection has already been disabled, otherwise we'll | |
2064 | * run into protection faults at module deallocation. | |
2065 | */ | |
2066 | if (mod->state == MODULE_STATE_UNFORMED || | |
2067 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 2068 | continue; |
85c898db RR |
2069 | |
2070 | frob_text(&mod->core_layout, set_memory_ro); | |
2071 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb | 2072 | } |
2073 | mutex_unlock(&module_mutex); | |
2074 | } | |
93651f80 | 2075 | #else /* !CONFIG_STRICT_MODULE_RWX */ |
85c898db | 2076 | static void module_enable_nx(const struct module *mod) { } |
93651f80 | 2077 | #endif /* CONFIG_STRICT_MODULE_RWX */ |
2eef1399 YY |
2078 | static void module_enable_x(const struct module *mod) |
2079 | { | |
2080 | frob_text(&mod->core_layout, set_memory_x); | |
2081 | frob_text(&mod->init_layout, set_memory_x); | |
2082 | } | |
93651f80 YY |
2083 | #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ |
2084 | static void module_enable_nx(const struct module *mod) { } | |
2085 | static void module_enable_x(const struct module *mod) { } | |
2086 | #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
2087 | ||
84e1c6bb | 2088 | |
1ce15ef4 JY |
2089 | #ifdef CONFIG_LIVEPATCH |
2090 | /* | |
2091 | * Persist Elf information about a module. Copy the Elf header, | |
2092 | * section header table, section string table, and symtab section | |
2093 | * index from info to mod->klp_info. | |
2094 | */ | |
2095 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2096 | { | |
2097 | unsigned int size, symndx; | |
2098 | int ret; | |
2099 | ||
2100 | size = sizeof(*mod->klp_info); | |
2101 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2102 | if (mod->klp_info == NULL) | |
2103 | return -ENOMEM; | |
2104 | ||
2105 | /* Elf header */ | |
2106 | size = sizeof(mod->klp_info->hdr); | |
2107 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2108 | ||
2109 | /* Elf section header table */ | |
2110 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2111 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2112 | if (mod->klp_info->sechdrs == NULL) { |
2113 | ret = -ENOMEM; | |
2114 | goto free_info; | |
2115 | } | |
1ce15ef4 JY |
2116 | |
2117 | /* Elf section name string table */ | |
2118 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2119 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2120 | if (mod->klp_info->secstrings == NULL) { |
2121 | ret = -ENOMEM; | |
2122 | goto free_sechdrs; | |
2123 | } | |
1ce15ef4 JY |
2124 | |
2125 | /* Elf symbol section index */ | |
2126 | symndx = info->index.sym; | |
2127 | mod->klp_info->symndx = symndx; | |
2128 | ||
2129 | /* | |
2130 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2131 | * copy of the original symbol table. Adjust sh_addr to point | |
2132 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2133 | * init memory is freed at the end of do_init_module(). | |
2134 | */ | |
2135 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2136 | (unsigned long) mod->core_kallsyms.symtab; | |
2137 | ||
2138 | return 0; | |
2139 | ||
2140 | free_sechdrs: | |
2141 | kfree(mod->klp_info->sechdrs); | |
2142 | free_info: | |
2143 | kfree(mod->klp_info); | |
2144 | return ret; | |
2145 | } | |
2146 | ||
2147 | static void free_module_elf(struct module *mod) | |
2148 | { | |
2149 | kfree(mod->klp_info->sechdrs); | |
2150 | kfree(mod->klp_info->secstrings); | |
2151 | kfree(mod->klp_info); | |
2152 | } | |
2153 | #else /* !CONFIG_LIVEPATCH */ | |
2154 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2155 | { | |
2156 | return 0; | |
2157 | } | |
2158 | ||
2159 | static void free_module_elf(struct module *mod) | |
2160 | { | |
2161 | } | |
2162 | #endif /* CONFIG_LIVEPATCH */ | |
2163 | ||
be1f221c | 2164 | void __weak module_memfree(void *module_region) |
74e08fcf | 2165 | { |
1a7b7d92 RE |
2166 | /* |
2167 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2168 | * supported by vmalloc. | |
2169 | */ | |
2170 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2171 | vfree(module_region); |
2172 | } | |
2173 | ||
2174 | void __weak module_arch_cleanup(struct module *mod) | |
2175 | { | |
2176 | } | |
2177 | ||
d453cded RR |
2178 | void __weak module_arch_freeing_init(struct module *mod) |
2179 | { | |
2180 | } | |
2181 | ||
75676500 | 2182 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2183 | static void free_module(struct module *mod) |
2184 | { | |
7ead8b83 LZ |
2185 | trace_module_free(mod); |
2186 | ||
36b0360d | 2187 | mod_sysfs_teardown(mod); |
1da177e4 | 2188 | |
944a1fa0 RR |
2189 | /* We leave it in list to prevent duplicate loads, but make sure |
2190 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2191 | mutex_lock(&module_mutex); |
944a1fa0 | 2192 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2193 | mutex_unlock(&module_mutex); |
944a1fa0 | 2194 | |
b82bab4b JB |
2195 | /* Remove dynamic debug info */ |
2196 | ddebug_remove_module(mod->name); | |
2197 | ||
1da177e4 LT |
2198 | /* Arch-specific cleanup. */ |
2199 | module_arch_cleanup(mod); | |
2200 | ||
2201 | /* Module unload stuff */ | |
2202 | module_unload_free(mod); | |
2203 | ||
e180a6b7 RR |
2204 | /* Free any allocated parameters. */ |
2205 | destroy_params(mod->kp, mod->num_kp); | |
2206 | ||
1ce15ef4 JY |
2207 | if (is_livepatch_module(mod)) |
2208 | free_module_elf(mod); | |
2209 | ||
944a1fa0 RR |
2210 | /* Now we can delete it from the lists */ |
2211 | mutex_lock(&module_mutex); | |
461e34ae MH |
2212 | /* Unlink carefully: kallsyms could be walking list. */ |
2213 | list_del_rcu(&mod->list); | |
93c2e105 | 2214 | mod_tree_remove(mod); |
0286b5ea | 2215 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2216 | module_bug_cleanup(mod); |
0be964be | 2217 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2218 | synchronize_rcu(); |
944a1fa0 RR |
2219 | mutex_unlock(&module_mutex); |
2220 | ||
85c898db | 2221 | /* This may be empty, but that's OK */ |
d453cded | 2222 | module_arch_freeing_init(mod); |
7523e4dc | 2223 | module_memfree(mod->init_layout.base); |
1da177e4 | 2224 | kfree(mod->args); |
259354de | 2225 | percpu_modfree(mod); |
9f85a4bb | 2226 | |
35a9393c | 2227 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2228 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2229 | |
1da177e4 | 2230 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2231 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2232 | } |
2233 | ||
2234 | void *__symbol_get(const char *symbol) | |
2235 | { | |
2236 | struct module *owner; | |
414fd31b | 2237 | const struct kernel_symbol *sym; |
1da177e4 | 2238 | |
24da1cbf | 2239 | preempt_disable(); |
414fd31b TA |
2240 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2241 | if (sym && strong_try_module_get(owner)) | |
2242 | sym = NULL; | |
24da1cbf | 2243 | preempt_enable(); |
1da177e4 | 2244 | |
7290d580 | 2245 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2246 | } |
2247 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2248 | ||
eea8b54d AN |
2249 | /* |
2250 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2251 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2252 | * |
2253 | * You must hold the module_mutex. | |
eea8b54d | 2254 | */ |
2d25bc55 | 2255 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2256 | { |
b211104d | 2257 | unsigned int i; |
eea8b54d | 2258 | struct module *owner; |
b211104d RR |
2259 | const struct kernel_symbol *s; |
2260 | struct { | |
2261 | const struct kernel_symbol *sym; | |
2262 | unsigned int num; | |
2263 | } arr[] = { | |
2264 | { mod->syms, mod->num_syms }, | |
2265 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2266 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2267 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2268 | { mod->unused_syms, mod->num_unused_syms }, |
2269 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2270 | #endif |
b211104d | 2271 | }; |
eea8b54d | 2272 | |
b211104d RR |
2273 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2274 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 AB |
2275 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
2276 | true, false)) { | |
bddb12b3 | 2277 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2278 | " (owned by %s)\n", |
7290d580 AB |
2279 | mod->name, kernel_symbol_name(s), |
2280 | module_name(owner)); | |
b211104d RR |
2281 | return -ENOEXEC; |
2282 | } | |
eea8b54d | 2283 | } |
b211104d RR |
2284 | } |
2285 | return 0; | |
eea8b54d AN |
2286 | } |
2287 | ||
9a4b9708 | 2288 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2289 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2290 | { | |
2291 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2292 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2293 | unsigned long secbase; |
49668688 | 2294 | unsigned int i; |
1da177e4 | 2295 | int ret = 0; |
414fd31b | 2296 | const struct kernel_symbol *ksym; |
1da177e4 | 2297 | |
49668688 RR |
2298 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2299 | const char *name = info->strtab + sym[i].st_name; | |
2300 | ||
1da177e4 LT |
2301 | switch (sym[i].st_shndx) { |
2302 | case SHN_COMMON: | |
80375980 JM |
2303 | /* Ignore common symbols */ |
2304 | if (!strncmp(name, "__gnu_lto", 9)) | |
2305 | break; | |
2306 | ||
1da177e4 LT |
2307 | /* We compiled with -fno-common. These are not |
2308 | supposed to happen. */ | |
5e124169 | 2309 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2310 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2311 | mod->name); |
2312 | ret = -ENOEXEC; | |
2313 | break; | |
2314 | ||
2315 | case SHN_ABS: | |
2316 | /* Don't need to do anything */ | |
5e124169 | 2317 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2318 | (long)sym[i].st_value); |
2319 | break; | |
2320 | ||
1ce15ef4 JY |
2321 | case SHN_LIVEPATCH: |
2322 | /* Livepatch symbols are resolved by livepatch */ | |
2323 | break; | |
2324 | ||
1da177e4 | 2325 | case SHN_UNDEF: |
49668688 | 2326 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2327 | /* Ok if resolved. */ |
9bea7f23 | 2328 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2329 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2330 | break; |
414fd31b TA |
2331 | } |
2332 | ||
1da177e4 | 2333 | /* Ok if weak. */ |
9bea7f23 | 2334 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2335 | break; |
2336 | ||
9bea7f23 | 2337 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2338 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2339 | mod->name, name, ret); | |
1da177e4 LT |
2340 | break; |
2341 | ||
2342 | default: | |
2343 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2344 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2345 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2346 | else |
49668688 | 2347 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2348 | sym[i].st_value += secbase; |
2349 | break; | |
2350 | } | |
2351 | } | |
2352 | ||
2353 | return ret; | |
2354 | } | |
2355 | ||
49668688 | 2356 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2357 | { |
2358 | unsigned int i; | |
2359 | int err = 0; | |
2360 | ||
2361 | /* Now do relocations. */ | |
49668688 RR |
2362 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2363 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2364 | |
2365 | /* Not a valid relocation section? */ | |
49668688 | 2366 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2367 | continue; |
2368 | ||
2369 | /* Don't bother with non-allocated sections */ | |
49668688 | 2370 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2371 | continue; |
2372 | ||
1ce15ef4 JY |
2373 | /* Livepatch relocation sections are applied by livepatch */ |
2374 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2375 | continue; | |
2376 | ||
49668688 RR |
2377 | if (info->sechdrs[i].sh_type == SHT_REL) |
2378 | err = apply_relocate(info->sechdrs, info->strtab, | |
2379 | info->index.sym, i, mod); | |
2380 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2381 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2382 | info->index.sym, i, mod); | |
22e268eb RR |
2383 | if (err < 0) |
2384 | break; | |
2385 | } | |
2386 | return err; | |
2387 | } | |
2388 | ||
088af9a6 HD |
2389 | /* Additional bytes needed by arch in front of individual sections */ |
2390 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2391 | unsigned int section) | |
2392 | { | |
2393 | /* default implementation just returns zero */ | |
2394 | return 0; | |
2395 | } | |
2396 | ||
1da177e4 | 2397 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2398 | static long get_offset(struct module *mod, unsigned int *size, |
2399 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2400 | { |
2401 | long ret; | |
2402 | ||
088af9a6 | 2403 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2404 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2405 | *size = ret + sechdr->sh_size; | |
2406 | return ret; | |
2407 | } | |
2408 | ||
2409 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2410 | might -- code, read-only data, read-write data, small data. Tally | |
2411 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2412 | belongs in init. */ | |
49668688 | 2413 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2414 | { |
2415 | static unsigned long const masks[][2] = { | |
2416 | /* NOTE: all executable code must be the first section | |
2417 | * in this array; otherwise modify the text_size | |
2418 | * finder in the two loops below */ | |
2419 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2420 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2421 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2422 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2423 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2424 | }; | |
2425 | unsigned int m, i; | |
2426 | ||
49668688 RR |
2427 | for (i = 0; i < info->hdr->e_shnum; i++) |
2428 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2429 | |
5e124169 | 2430 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2431 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2432 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2433 | Elf_Shdr *s = &info->sechdrs[i]; | |
2434 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2435 | |
2436 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2437 | || (s->sh_flags & masks[m][1]) | |
2438 | || s->sh_entsize != ~0UL | |
49668688 | 2439 | || strstarts(sname, ".init")) |
1da177e4 | 2440 | continue; |
7523e4dc | 2441 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2442 | pr_debug("\t%s\n", sname); |
1da177e4 | 2443 | } |
84e1c6bb | 2444 | switch (m) { |
2445 | case 0: /* executable */ | |
7523e4dc RR |
2446 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2447 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb | 2448 | break; |
2449 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2450 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2451 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2452 | break; |
444d13ff JY |
2453 | case 2: /* RO after init */ |
2454 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2455 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2456 | break; | |
2457 | case 4: /* whole core */ | |
7523e4dc | 2458 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb | 2459 | break; |
2460 | } | |
1da177e4 LT |
2461 | } |
2462 | ||
5e124169 | 2463 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2464 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2465 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2466 | Elf_Shdr *s = &info->sechdrs[i]; | |
2467 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2468 | |
2469 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2470 | || (s->sh_flags & masks[m][1]) | |
2471 | || s->sh_entsize != ~0UL | |
49668688 | 2472 | || !strstarts(sname, ".init")) |
1da177e4 | 2473 | continue; |
7523e4dc | 2474 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2475 | | INIT_OFFSET_MASK); |
5e124169 | 2476 | pr_debug("\t%s\n", sname); |
1da177e4 | 2477 | } |
84e1c6bb | 2478 | switch (m) { |
2479 | case 0: /* executable */ | |
7523e4dc RR |
2480 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2481 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb | 2482 | break; |
2483 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2484 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2485 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2486 | break; |
444d13ff JY |
2487 | case 2: |
2488 | /* | |
2489 | * RO after init doesn't apply to init_layout (only | |
2490 | * core_layout), so it just takes the value of ro_size. | |
2491 | */ | |
2492 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2493 | break; | |
2494 | case 4: /* whole init */ | |
7523e4dc | 2495 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb | 2496 | break; |
2497 | } | |
1da177e4 LT |
2498 | } |
2499 | } | |
2500 | ||
1da177e4 LT |
2501 | static void set_license(struct module *mod, const char *license) |
2502 | { | |
2503 | if (!license) | |
2504 | license = "unspecified"; | |
2505 | ||
fa3ba2e8 | 2506 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2507 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2508 | pr_warn("%s: module license '%s' taints kernel.\n", |
2509 | mod->name, license); | |
373d4d09 RR |
2510 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2511 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2512 | } |
2513 | } | |
2514 | ||
2515 | /* Parse tag=value strings from .modinfo section */ | |
2516 | static char *next_string(char *string, unsigned long *secsize) | |
2517 | { | |
2518 | /* Skip non-zero chars */ | |
2519 | while (string[0]) { | |
2520 | string++; | |
2521 | if ((*secsize)-- <= 1) | |
2522 | return NULL; | |
2523 | } | |
2524 | ||
2525 | /* Skip any zero padding. */ | |
2526 | while (!string[0]) { | |
2527 | string++; | |
2528 | if ((*secsize)-- <= 1) | |
2529 | return NULL; | |
2530 | } | |
2531 | return string; | |
2532 | } | |
2533 | ||
c5e4a062 MM |
2534 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
2535 | char *prev) | |
1da177e4 LT |
2536 | { |
2537 | char *p; | |
2538 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2539 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2540 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2541 | |
5fdc7db6 JY |
2542 | /* |
2543 | * get_modinfo() calls made before rewrite_section_headers() | |
2544 | * must use sh_offset, as sh_addr isn't set! | |
2545 | */ | |
c5e4a062 MM |
2546 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
2547 | ||
2548 | if (prev) { | |
2549 | size -= prev - modinfo; | |
2550 | modinfo = next_string(prev, &size); | |
2551 | } | |
2552 | ||
2553 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2554 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2555 | return p + taglen + 1; | |
2556 | } | |
2557 | return NULL; | |
2558 | } | |
2559 | ||
c5e4a062 MM |
2560 | static char *get_modinfo(const struct load_info *info, const char *tag) |
2561 | { | |
2562 | return get_next_modinfo(info, tag, NULL); | |
2563 | } | |
2564 | ||
49668688 | 2565 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2566 | { |
2567 | struct module_attribute *attr; | |
2568 | int i; | |
2569 | ||
2570 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2571 | if (attr->setup) | |
49668688 | 2572 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2573 | } |
2574 | } | |
c988d2b2 | 2575 | |
a263f776 RR |
2576 | static void free_modinfo(struct module *mod) |
2577 | { | |
2578 | struct module_attribute *attr; | |
2579 | int i; | |
2580 | ||
2581 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2582 | if (attr->free) | |
2583 | attr->free(mod); | |
2584 | } | |
2585 | } | |
2586 | ||
1da177e4 | 2587 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2588 | |
2d25bc55 JY |
2589 | /* Lookup exported symbol in given range of kernel_symbols */ |
2590 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2591 | const struct kernel_symbol *start, | |
2592 | const struct kernel_symbol *stop) | |
15bba37d | 2593 | { |
9d63487f AIB |
2594 | return bsearch(name, start, stop - start, |
2595 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2596 | } |
2597 | ||
ca4787b7 TA |
2598 | static int is_exported(const char *name, unsigned long value, |
2599 | const struct module *mod) | |
1da177e4 | 2600 | { |
ca4787b7 TA |
2601 | const struct kernel_symbol *ks; |
2602 | if (!mod) | |
2d25bc55 | 2603 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2604 | else |
2d25bc55 JY |
2605 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2606 | ||
7290d580 | 2607 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2608 | } |
2609 | ||
2610 | /* As per nm */ | |
eded41c1 | 2611 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2612 | { |
eded41c1 RR |
2613 | const Elf_Shdr *sechdrs = info->sechdrs; |
2614 | ||
1da177e4 LT |
2615 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2616 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2617 | return 'v'; | |
2618 | else | |
2619 | return 'w'; | |
2620 | } | |
2621 | if (sym->st_shndx == SHN_UNDEF) | |
2622 | return 'U'; | |
e0224418 | 2623 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2624 | return 'a'; |
2625 | if (sym->st_shndx >= SHN_LORESERVE) | |
2626 | return '?'; | |
2627 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2628 | return 't'; | |
2629 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2630 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2631 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2632 | return 'r'; | |
2633 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2634 | return 'g'; | |
2635 | else | |
2636 | return 'd'; | |
2637 | } | |
2638 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2639 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2640 | return 's'; | |
2641 | else | |
2642 | return 'b'; | |
2643 | } | |
eded41c1 RR |
2644 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2645 | ".debug")) { | |
1da177e4 | 2646 | return 'n'; |
eded41c1 | 2647 | } |
1da177e4 LT |
2648 | return '?'; |
2649 | } | |
2650 | ||
4a496226 | 2651 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2652 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2653 | { |
2654 | const Elf_Shdr *sec; | |
2655 | ||
2656 | if (src->st_shndx == SHN_UNDEF | |
2657 | || src->st_shndx >= shnum | |
2658 | || !src->st_name) | |
2659 | return false; | |
2660 | ||
e0224418 MB |
2661 | #ifdef CONFIG_KALLSYMS_ALL |
2662 | if (src->st_shndx == pcpundx) | |
2663 | return true; | |
2664 | #endif | |
2665 | ||
4a496226 JB |
2666 | sec = sechdrs + src->st_shndx; |
2667 | if (!(sec->sh_flags & SHF_ALLOC) | |
2668 | #ifndef CONFIG_KALLSYMS_ALL | |
2669 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2670 | #endif | |
2671 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2672 | return false; | |
2673 | ||
2674 | return true; | |
2675 | } | |
2676 | ||
48fd1188 KC |
2677 | /* |
2678 | * We only allocate and copy the strings needed by the parts of symtab | |
2679 | * we keep. This is simple, but has the effect of making multiple | |
2680 | * copies of duplicates. We could be more sophisticated, see | |
2681 | * linux-kernel thread starting with | |
2682 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2683 | */ | |
49668688 | 2684 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2685 | { |
49668688 RR |
2686 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2687 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2688 | const Elf_Sym *src; |
54523ec7 | 2689 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2690 | |
2691 | /* Put symbol section at end of init part of module. */ | |
2692 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2693 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2694 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2695 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2696 | |
49668688 | 2697 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2698 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2699 | |
48fd1188 | 2700 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2701 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2702 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2703 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2704 | info->index.pcpu)) { | |
59ef28b1 | 2705 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2706 | ndst++; |
554bdfe5 | 2707 | } |
59ef28b1 | 2708 | } |
4a496226 JB |
2709 | |
2710 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2711 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2712 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2713 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2714 | info->core_typeoffs = mod->core_layout.size; |
2715 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2716 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2717 | |
554bdfe5 JB |
2718 | /* Put string table section at end of init part of module. */ |
2719 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2720 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2721 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2722 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2723 | |
2724 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2725 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2726 | __alignof__(struct mod_kallsyms)); | |
2727 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2728 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2729 | info->init_typeoffs = mod->init_layout.size; |
2730 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2731 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2732 | } |
2733 | ||
8244062e RR |
2734 | /* |
2735 | * We use the full symtab and strtab which layout_symtab arranged to | |
2736 | * be appended to the init section. Later we switch to the cut-down | |
2737 | * core-only ones. | |
2738 | */ | |
811d66a0 | 2739 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2740 | { |
4a496226 JB |
2741 | unsigned int i, ndst; |
2742 | const Elf_Sym *src; | |
2743 | Elf_Sym *dst; | |
554bdfe5 | 2744 | char *s; |
eded41c1 | 2745 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2746 | |
8244062e RR |
2747 | /* Set up to point into init section. */ |
2748 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2749 | ||
2750 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2751 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2752 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2753 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2754 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2755 | |
1c7651f4 EL |
2756 | /* |
2757 | * Now populate the cut down core kallsyms for after init | |
2758 | * and set types up while we still have access to sections. | |
2759 | */ | |
8244062e RR |
2760 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2761 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2762 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2763 | src = mod->kallsyms->symtab; |
2764 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2765 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2766 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2767 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2768 | info->index.pcpu)) { | |
1c7651f4 EL |
2769 | mod->core_kallsyms.typetab[ndst] = |
2770 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2771 | dst[ndst] = src[i]; |
8244062e RR |
2772 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2773 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2774 | KSYM_NAME_LEN) + 1; |
2775 | } | |
4a496226 | 2776 | } |
8244062e | 2777 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2778 | } |
2779 | #else | |
49668688 | 2780 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2781 | { |
2782 | } | |
3ae91c21 | 2783 | |
abbce906 | 2784 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2785 | { |
2786 | } | |
2787 | #endif /* CONFIG_KALLSYMS */ | |
2788 | ||
52796312 | 2789 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2790 | { |
811d66a0 RR |
2791 | if (!debug) |
2792 | return; | |
513770f5 | 2793 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2794 | } |
346e15be | 2795 | |
52796312 | 2796 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2797 | { |
2798 | if (debug) | |
52796312 | 2799 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2800 | } |
2801 | ||
74e08fcf JB |
2802 | void * __weak module_alloc(unsigned long size) |
2803 | { | |
82fab442 | 2804 | return vmalloc_exec(size); |
74e08fcf JB |
2805 | } |
2806 | ||
38b37d63 MS |
2807 | bool __weak module_exit_section(const char *name) |
2808 | { | |
2809 | return strstarts(name, ".exit"); | |
2810 | } | |
2811 | ||
4f2294b6 | 2812 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2813 | static void kmemleak_load_module(const struct module *mod, |
2814 | const struct load_info *info) | |
4f2294b6 CM |
2815 | { |
2816 | unsigned int i; | |
2817 | ||
2818 | /* only scan the sections containing data */ | |
c017b4be | 2819 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2820 | |
49668688 | 2821 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2822 | /* Scan all writable sections that's not executable */ |
2823 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2824 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2825 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2826 | continue; |
2827 | ||
49668688 RR |
2828 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2829 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2830 | } |
2831 | } | |
2832 | #else | |
49668688 RR |
2833 | static inline void kmemleak_load_module(const struct module *mod, |
2834 | const struct load_info *info) | |
4f2294b6 CM |
2835 | { |
2836 | } | |
2837 | #endif | |
2838 | ||
106a4ee2 | 2839 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2840 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 | 2841 | { |
49fcf732 | 2842 | int err = -ENODATA; |
34e1169d | 2843 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
49fcf732 | 2844 | const char *reason; |
34e1169d | 2845 | const void *mod = info->hdr; |
caabe240 | 2846 | |
bca014ca BH |
2847 | /* |
2848 | * Require flags == 0, as a module with version information | |
2849 | * removed is no longer the module that was signed | |
2850 | */ | |
2851 | if (flags == 0 && | |
2852 | info->len > markerlen && | |
34e1169d | 2853 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2854 | /* We truncate the module to discard the signature */ |
34e1169d | 2855 | info->len -= markerlen; |
f314dfea | 2856 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2857 | } |
2858 | ||
49fcf732 DH |
2859 | switch (err) { |
2860 | case 0: | |
106a4ee2 RR |
2861 | info->sig_ok = true; |
2862 | return 0; | |
106a4ee2 | 2863 | |
49fcf732 DH |
2864 | /* We don't permit modules to be loaded into trusted kernels |
2865 | * without a valid signature on them, but if we're not | |
2866 | * enforcing, certain errors are non-fatal. | |
2867 | */ | |
2868 | case -ENODATA: | |
2869 | reason = "Loading of unsigned module"; | |
2870 | goto decide; | |
2871 | case -ENOPKG: | |
2872 | reason = "Loading of module with unsupported crypto"; | |
2873 | goto decide; | |
2874 | case -ENOKEY: | |
2875 | reason = "Loading of module with unavailable key"; | |
2876 | decide: | |
2877 | if (is_module_sig_enforced()) { | |
2878 | pr_notice("%s is rejected\n", reason); | |
2879 | return -EKEYREJECTED; | |
2880 | } | |
106a4ee2 | 2881 | |
49fcf732 DH |
2882 | return security_locked_down(LOCKDOWN_MODULE_SIGNATURE); |
2883 | ||
2884 | /* All other errors are fatal, including nomem, unparseable | |
2885 | * signatures and signature check failures - even if signatures | |
2886 | * aren't required. | |
2887 | */ | |
2888 | default: | |
2889 | return err; | |
2890 | } | |
106a4ee2 RR |
2891 | } |
2892 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2893 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2894 | { |
2895 | return 0; | |
2896 | } | |
2897 | #endif /* !CONFIG_MODULE_SIG */ | |
2898 | ||
34e1169d KC |
2899 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2900 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2901 | { |
34e1169d KC |
2902 | if (info->len < sizeof(*(info->hdr))) |
2903 | return -ENOEXEC; | |
2904 | ||
2905 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2906 | || info->hdr->e_type != ET_REL | |
2907 | || !elf_check_arch(info->hdr) | |
2908 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2909 | return -ENOEXEC; | |
2910 | ||
2911 | if (info->hdr->e_shoff >= info->len | |
2912 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2913 | info->len - info->hdr->e_shoff)) | |
2914 | return -ENOEXEC; | |
40dd2560 | 2915 | |
34e1169d KC |
2916 | return 0; |
2917 | } | |
2918 | ||
3afe9f84 LT |
2919 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2920 | ||
2921 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2922 | { | |
2923 | do { | |
2924 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2925 | ||
2926 | if (copy_from_user(dst, usrc, n) != 0) | |
2927 | return -EFAULT; | |
2928 | cond_resched(); | |
2929 | dst += n; | |
2930 | usrc += n; | |
2931 | len -= n; | |
2932 | } while (len); | |
2933 | return 0; | |
2934 | } | |
2935 | ||
1ce15ef4 | 2936 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2937 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2938 | { |
2992ef29 JP |
2939 | if (get_modinfo(info, "livepatch")) { |
2940 | mod->klp = true; | |
2941 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2942 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2943 | mod->name); | |
2992ef29 | 2944 | } |
1ce15ef4 JY |
2945 | |
2946 | return 0; | |
2947 | } | |
2948 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2949 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2950 | { |
2951 | if (get_modinfo(info, "livepatch")) { | |
2952 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2953 | mod->name); | |
2954 | return -ENOEXEC; | |
2955 | } | |
2956 | ||
2957 | return 0; | |
2958 | } | |
2959 | #endif /* CONFIG_LIVEPATCH */ | |
2960 | ||
caf7501a AK |
2961 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2962 | { | |
2963 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2964 | return; | |
2965 | ||
2966 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2967 | mod->name); | |
2968 | } | |
2969 | ||
34e1169d KC |
2970 | /* Sets info->hdr and info->len. */ |
2971 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2972 | struct load_info *info) | |
40dd2560 RR |
2973 | { |
2974 | int err; | |
40dd2560 | 2975 | |
34e1169d KC |
2976 | info->len = len; |
2977 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2978 | return -ENOEXEC; |
2979 | ||
c77b8cdf | 2980 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2981 | if (err) |
2982 | return err; | |
2983 | ||
40dd2560 | 2984 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2985 | info->hdr = __vmalloc(info->len, |
19809c2d | 2986 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2987 | if (!info->hdr) |
40dd2560 RR |
2988 | return -ENOMEM; |
2989 | ||
3afe9f84 | 2990 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2991 | vfree(info->hdr); |
2992 | return -EFAULT; | |
40dd2560 RR |
2993 | } |
2994 | ||
34e1169d KC |
2995 | return 0; |
2996 | } | |
2997 | ||
d913188c RR |
2998 | static void free_copy(struct load_info *info) |
2999 | { | |
d913188c RR |
3000 | vfree(info->hdr); |
3001 | } | |
3002 | ||
2f3238ae | 3003 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
3004 | { |
3005 | unsigned int i; | |
3006 | ||
3007 | /* This should always be true, but let's be sure. */ | |
3008 | info->sechdrs[0].sh_addr = 0; | |
3009 | ||
3010 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3011 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
3012 | if (shdr->sh_type != SHT_NOBITS | |
3013 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 3014 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
3015 | return -ENOEXEC; |
3016 | } | |
3017 | ||
3018 | /* Mark all sections sh_addr with their address in the | |
3019 | temporary image. */ | |
3020 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
3021 | ||
3022 | #ifndef CONFIG_MODULE_UNLOAD | |
3023 | /* Don't load .exit sections */ | |
38b37d63 | 3024 | if (module_exit_section(info->secstrings+shdr->sh_name)) |
8b5f61a7 RR |
3025 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; |
3026 | #endif | |
8b5f61a7 | 3027 | } |
d6df72a0 RR |
3028 | |
3029 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 3030 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 3031 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 3032 | |
8b5f61a7 RR |
3033 | return 0; |
3034 | } | |
3035 | ||
3264d3f9 LT |
3036 | /* |
3037 | * Set up our basic convenience variables (pointers to section headers, | |
3038 | * search for module section index etc), and do some basic section | |
3039 | * verification. | |
3040 | * | |
81a0abd9 JY |
3041 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
3042 | * will be allocated in move_module(). | |
3264d3f9 | 3043 | */ |
81a0abd9 | 3044 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
3045 | { |
3046 | unsigned int i; | |
3264d3f9 LT |
3047 | |
3048 | /* Set up the convenience variables */ | |
3049 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
3050 | info->secstrings = (void *)info->hdr |
3051 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 3052 | |
5fdc7db6 JY |
3053 | /* Try to find a name early so we can log errors with a module name */ |
3054 | info->index.info = find_sec(info, ".modinfo"); | |
3055 | if (!info->index.info) | |
3056 | info->name = "(missing .modinfo section)"; | |
3057 | else | |
3058 | info->name = get_modinfo(info, "name"); | |
3264d3f9 | 3059 | |
8b5f61a7 RR |
3060 | /* Find internal symbols and strings. */ |
3061 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
3062 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
3063 | info->index.sym = i; | |
3064 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
3065 | info->strtab = (char *)info->hdr |
3066 | + info->sechdrs[info->index.str].sh_offset; | |
3067 | break; | |
3264d3f9 | 3068 | } |
3264d3f9 LT |
3069 | } |
3070 | ||
5fdc7db6 JY |
3071 | if (info->index.sym == 0) { |
3072 | pr_warn("%s: module has no symbols (stripped?)\n", info->name); | |
3073 | return -ENOEXEC; | |
3074 | } | |
3075 | ||
49668688 | 3076 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 3077 | if (!info->index.mod) { |
3e2e857f KC |
3078 | pr_warn("%s: No module found in object\n", |
3079 | info->name ?: "(missing .modinfo name field)"); | |
81a0abd9 | 3080 | return -ENOEXEC; |
3264d3f9 LT |
3081 | } |
3082 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 3083 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 3084 | |
3e2e857f | 3085 | /* |
5fdc7db6 | 3086 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
3087 | * on-disk struct mod 'name' field. |
3088 | */ | |
3089 | if (!info->name) | |
81a0abd9 | 3090 | info->name = info->mod->name; |
3e2e857f | 3091 | |
5fdc7db6 JY |
3092 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
3093 | info->index.vers = 0; /* Pretend no __versions section! */ | |
3094 | else | |
3095 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 3096 | |
49668688 | 3097 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3098 | |
81a0abd9 | 3099 | return 0; |
3264d3f9 LT |
3100 | } |
3101 | ||
2f3238ae | 3102 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3103 | { |
49668688 | 3104 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3105 | int err; |
3106 | ||
2f3238ae RR |
3107 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3108 | modmagic = NULL; | |
3109 | ||
40dd2560 RR |
3110 | /* This is allowed: modprobe --force will invalidate it. */ |
3111 | if (!modmagic) { | |
3112 | err = try_to_force_load(mod, "bad vermagic"); | |
3113 | if (err) | |
3114 | return err; | |
49668688 | 3115 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3116 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3117 | info->name, modmagic, vermagic); |
40dd2560 RR |
3118 | return -ENOEXEC; |
3119 | } | |
3120 | ||
3205c36c LP |
3121 | if (!get_modinfo(info, "intree")) { |
3122 | if (!test_taint(TAINT_OOT_MODULE)) | |
3123 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3124 | mod->name); | |
373d4d09 | 3125 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3126 | } |
2449b8ba | 3127 | |
caf7501a AK |
3128 | check_modinfo_retpoline(mod, info); |
3129 | ||
49668688 | 3130 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3131 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3132 | pr_warn("%s: module is from the staging directory, the quality " |
3133 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3134 | } |
22e268eb | 3135 | |
2992ef29 | 3136 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3137 | if (err) |
3138 | return err; | |
3139 | ||
22e268eb | 3140 | /* Set up license info based on the info section */ |
49668688 | 3141 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3142 | |
40dd2560 RR |
3143 | return 0; |
3144 | } | |
3145 | ||
eb3057df | 3146 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3147 | { |
49668688 | 3148 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3149 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3150 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3151 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3152 | mod->crcs = section_addr(info, "__kcrctab"); |
3153 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3154 | sizeof(*mod->gpl_syms), |
3155 | &mod->num_gpl_syms); | |
49668688 RR |
3156 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3157 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3158 | "__ksymtab_gpl_future", |
3159 | sizeof(*mod->gpl_future_syms), | |
3160 | &mod->num_gpl_future_syms); | |
49668688 | 3161 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3162 | |
3163 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3164 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3165 | sizeof(*mod->unused_syms), |
3166 | &mod->num_unused_syms); | |
49668688 RR |
3167 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3168 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3169 | sizeof(*mod->unused_gpl_syms), |
3170 | &mod->num_unused_gpl_syms); | |
49668688 | 3171 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3172 | #endif |
3173 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3174 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3175 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3176 | if (!mod->ctors) |
3177 | mod->ctors = section_objs(info, ".init_array", | |
3178 | sizeof(*mod->ctors), &mod->num_ctors); | |
3179 | else if (find_sec(info, ".init_array")) { | |
3180 | /* | |
3181 | * This shouldn't happen with same compiler and binutils | |
3182 | * building all parts of the module. | |
3183 | */ | |
6da0b565 | 3184 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3185 | mod->name); |
3186 | return -EINVAL; | |
3187 | } | |
f91a13bb LT |
3188 | #endif |
3189 | ||
3190 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3191 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3192 | sizeof(*mod->tracepoints_ptrs), | |
3193 | &mod->num_tracepoints); | |
f91a13bb | 3194 | #endif |
fe15b50c PM |
3195 | #ifdef CONFIG_TREE_SRCU |
3196 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
3197 | sizeof(*mod->srcu_struct_ptrs), | |
3198 | &mod->num_srcu_structs); | |
3199 | #endif | |
a38d1107 MM |
3200 | #ifdef CONFIG_BPF_EVENTS |
3201 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3202 | sizeof(*mod->bpf_raw_events), | |
3203 | &mod->num_bpf_raw_events); | |
3204 | #endif | |
e9666d10 | 3205 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3206 | mod->jump_entries = section_objs(info, "__jump_table", |
3207 | sizeof(*mod->jump_entries), | |
3208 | &mod->num_jump_entries); | |
3209 | #endif | |
f91a13bb | 3210 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3211 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3212 | sizeof(*mod->trace_events), |
3213 | &mod->num_trace_events); | |
99be647c JL |
3214 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3215 | sizeof(*mod->trace_evals), | |
3216 | &mod->num_trace_evals); | |
f91a13bb | 3217 | #endif |
13b9b6e7 SR |
3218 | #ifdef CONFIG_TRACING |
3219 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3220 | sizeof(*mod->trace_bprintk_fmt_start), | |
3221 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3222 | #endif |
f91a13bb LT |
3223 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3224 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3225 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3226 | sizeof(*mod->ftrace_callsites), |
3227 | &mod->num_ftrace_callsites); | |
3228 | #endif | |
540adea3 MH |
3229 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3230 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3231 | sizeof(*mod->ei_funcs), | |
3232 | &mod->num_ei_funcs); | |
92ace999 | 3233 | #endif |
811d66a0 RR |
3234 | mod->extable = section_objs(info, "__ex_table", |
3235 | sizeof(*mod->extable), &mod->num_exentries); | |
3236 | ||
49668688 | 3237 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3238 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3239 | |
3240 | info->debug = section_objs(info, "__verbose", | |
3241 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3242 | |
3243 | return 0; | |
f91a13bb LT |
3244 | } |
3245 | ||
49668688 | 3246 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3247 | { |
3248 | int i; | |
3249 | void *ptr; | |
3250 | ||
3251 | /* Do the allocs. */ | |
7523e4dc | 3252 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3253 | /* |
3254 | * The pointer to this block is stored in the module structure | |
3255 | * which is inside the block. Just mark it as not being a | |
3256 | * leak. | |
3257 | */ | |
3258 | kmemleak_not_leak(ptr); | |
3259 | if (!ptr) | |
d913188c | 3260 | return -ENOMEM; |
65b8a9b4 | 3261 | |
7523e4dc RR |
3262 | memset(ptr, 0, mod->core_layout.size); |
3263 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3264 | |
7523e4dc RR |
3265 | if (mod->init_layout.size) { |
3266 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3267 | /* |
3268 | * The pointer to this block is stored in the module structure | |
3269 | * which is inside the block. This block doesn't need to be | |
3270 | * scanned as it contains data and code that will be freed | |
3271 | * after the module is initialized. | |
3272 | */ | |
3273 | kmemleak_ignore(ptr); | |
3274 | if (!ptr) { | |
7523e4dc | 3275 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3276 | return -ENOMEM; |
3277 | } | |
7523e4dc RR |
3278 | memset(ptr, 0, mod->init_layout.size); |
3279 | mod->init_layout.base = ptr; | |
82fab442 | 3280 | } else |
7523e4dc | 3281 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3282 | |
3283 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3284 | pr_debug("final section addresses:\n"); |
49668688 | 3285 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3286 | void *dest; |
49668688 | 3287 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3288 | |
49668688 | 3289 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3290 | continue; |
3291 | ||
49668688 | 3292 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3293 | dest = mod->init_layout.base |
49668688 | 3294 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3295 | else |
7523e4dc | 3296 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3297 | |
49668688 RR |
3298 | if (shdr->sh_type != SHT_NOBITS) |
3299 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3300 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3301 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3302 | pr_debug("\t0x%lx %s\n", |
3303 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3304 | } |
d913188c RR |
3305 | |
3306 | return 0; | |
65b8a9b4 LT |
3307 | } |
3308 | ||
49668688 | 3309 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3310 | { |
3205c36c LP |
3311 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3312 | ||
22e268eb RR |
3313 | /* |
3314 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3315 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3316 | * using GPL-only symbols it needs. | |
3317 | */ | |
3318 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3319 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3320 | |
3321 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3322 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3323 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3324 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3325 | |
c99af375 MG |
3326 | /* lve claims to be GPL but upstream won't provide source */ |
3327 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3328 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3329 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3330 | |
3205c36c LP |
3331 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3332 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3333 | ||
22e268eb RR |
3334 | #ifdef CONFIG_MODVERSIONS |
3335 | if ((mod->num_syms && !mod->crcs) | |
3336 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3337 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3338 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3339 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3340 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3341 | #endif | |
3342 | ) { | |
3343 | return try_to_force_load(mod, | |
3344 | "no versions for exported symbols"); | |
3345 | } | |
3346 | #endif | |
3347 | return 0; | |
3348 | } | |
3349 | ||
3350 | static void flush_module_icache(const struct module *mod) | |
3351 | { | |
3352 | mm_segment_t old_fs; | |
3353 | ||
3354 | /* flush the icache in correct context */ | |
3355 | old_fs = get_fs(); | |
3356 | set_fs(KERNEL_DS); | |
3357 | ||
3358 | /* | |
3359 | * Flush the instruction cache, since we've played with text. | |
3360 | * Do it before processing of module parameters, so the module | |
3361 | * can provide parameter accessor functions of its own. | |
3362 | */ | |
7523e4dc RR |
3363 | if (mod->init_layout.base) |
3364 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3365 | (unsigned long)mod->init_layout.base | |
3366 | + mod->init_layout.size); | |
3367 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3368 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3369 | |
3370 | set_fs(old_fs); | |
3371 | } | |
3372 | ||
74e08fcf JB |
3373 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3374 | Elf_Shdr *sechdrs, | |
3375 | char *secstrings, | |
3376 | struct module *mod) | |
3377 | { | |
3378 | return 0; | |
3379 | } | |
3380 | ||
be7de5f9 PB |
3381 | /* module_blacklist is a comma-separated list of module names */ |
3382 | static char *module_blacklist; | |
96b5b194 | 3383 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3384 | { |
3385 | const char *p; | |
3386 | size_t len; | |
3387 | ||
3388 | if (!module_blacklist) | |
3389 | return false; | |
3390 | ||
3391 | for (p = module_blacklist; *p; p += len) { | |
3392 | len = strcspn(p, ","); | |
3393 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3394 | return true; | |
3395 | if (p[len] == ',') | |
3396 | len++; | |
3397 | } | |
3398 | return false; | |
3399 | } | |
3400 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3401 | ||
2f3238ae | 3402 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3403 | { |
1da177e4 | 3404 | struct module *mod; |
444d13ff | 3405 | unsigned int ndx; |
d913188c | 3406 | int err; |
3ae91c21 | 3407 | |
81a0abd9 | 3408 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3409 | if (err) |
3410 | return ERR_PTR(err); | |
1da177e4 | 3411 | |
1da177e4 | 3412 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3413 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3414 | info->secstrings, info->mod); |
1da177e4 | 3415 | if (err < 0) |
8d8022e8 | 3416 | return ERR_PTR(err); |
1da177e4 | 3417 | |
8d8022e8 RR |
3418 | /* We will do a special allocation for per-cpu sections later. */ |
3419 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3420 | |
444d13ff JY |
3421 | /* |
3422 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3423 | * layout_sections() can put it in the right place. | |
3424 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3425 | */ | |
3426 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3427 | if (ndx) |
3428 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3429 | /* | |
3430 | * Mark the __jump_table section as ro_after_init as well: these data | |
3431 | * structures are never modified, with the exception of entries that | |
3432 | * refer to code in the __init section, which are annotated as such | |
3433 | * at module load time. | |
3434 | */ | |
3435 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3436 | if (ndx) |
3437 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3438 | ||
1da177e4 LT |
3439 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3440 | this is done generically; there doesn't appear to be any | |
3441 | special cases for the architectures. */ | |
81a0abd9 JY |
3442 | layout_sections(info->mod, info); |
3443 | layout_symtab(info->mod, info); | |
1da177e4 | 3444 | |
65b8a9b4 | 3445 | /* Allocate and move to the final place */ |
81a0abd9 | 3446 | err = move_module(info->mod, info); |
d913188c | 3447 | if (err) |
8d8022e8 | 3448 | return ERR_PTR(err); |
d913188c RR |
3449 | |
3450 | /* Module has been copied to its final place now: return it. */ | |
3451 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3452 | kmemleak_load_module(mod, info); |
d913188c | 3453 | return mod; |
d913188c RR |
3454 | } |
3455 | ||
3456 | /* mod is no longer valid after this! */ | |
3457 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3458 | { | |
d913188c | 3459 | percpu_modfree(mod); |
d453cded | 3460 | module_arch_freeing_init(mod); |
7523e4dc RR |
3461 | module_memfree(mod->init_layout.base); |
3462 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3463 | } |
3464 | ||
74e08fcf JB |
3465 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3466 | const Elf_Shdr *sechdrs, | |
3467 | struct module *me) | |
3468 | { | |
3469 | return 0; | |
3470 | } | |
3471 | ||
811d66a0 RR |
3472 | static int post_relocation(struct module *mod, const struct load_info *info) |
3473 | { | |
51f3d0f4 | 3474 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3475 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3476 | ||
3477 | /* Copy relocated percpu area over. */ | |
3478 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3479 | info->sechdrs[info->index.pcpu].sh_size); | |
3480 | ||
51f3d0f4 | 3481 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3482 | add_kallsyms(mod, info); |
3483 | ||
3484 | /* Arch-specific module finalizing. */ | |
3485 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3486 | } | |
3487 | ||
9bb9c3be RR |
3488 | /* Is this module of this name done loading? No locks held. */ |
3489 | static bool finished_loading(const char *name) | |
3490 | { | |
3491 | struct module *mod; | |
3492 | bool ret; | |
3493 | ||
9cc019b8 PZ |
3494 | /* |
3495 | * The module_mutex should not be a heavily contended lock; | |
3496 | * if we get the occasional sleep here, we'll go an extra iteration | |
3497 | * in the wait_event_interruptible(), which is harmless. | |
3498 | */ | |
3499 | sched_annotate_sleep(); | |
9bb9c3be | 3500 | mutex_lock(&module_mutex); |
4f6de4d5 | 3501 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 3502 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
3503 | mutex_unlock(&module_mutex); |
3504 | ||
3505 | return ret; | |
3506 | } | |
3507 | ||
34e1169d KC |
3508 | /* Call module constructors. */ |
3509 | static void do_mod_ctors(struct module *mod) | |
3510 | { | |
3511 | #ifdef CONFIG_CONSTRUCTORS | |
3512 | unsigned long i; | |
3513 | ||
3514 | for (i = 0; i < mod->num_ctors; i++) | |
3515 | mod->ctors[i](); | |
3516 | #endif | |
3517 | } | |
3518 | ||
c7496379 RR |
3519 | /* For freeing module_init on success, in case kallsyms traversing */ |
3520 | struct mod_initfree { | |
1a7b7d92 | 3521 | struct llist_node node; |
c7496379 RR |
3522 | void *module_init; |
3523 | }; | |
3524 | ||
1a7b7d92 | 3525 | static void do_free_init(struct work_struct *w) |
c7496379 | 3526 | { |
1a7b7d92 RE |
3527 | struct llist_node *pos, *n, *list; |
3528 | struct mod_initfree *initfree; | |
3529 | ||
3530 | list = llist_del_all(&init_free_list); | |
3531 | ||
3532 | synchronize_rcu(); | |
3533 | ||
3534 | llist_for_each_safe(pos, n, list) { | |
3535 | initfree = container_of(pos, struct mod_initfree, node); | |
3536 | module_memfree(initfree->module_init); | |
3537 | kfree(initfree); | |
3538 | } | |
c7496379 RR |
3539 | } |
3540 | ||
1a7b7d92 RE |
3541 | static int __init modules_wq_init(void) |
3542 | { | |
3543 | INIT_WORK(&init_free_wq, do_free_init); | |
3544 | init_llist_head(&init_free_list); | |
3545 | return 0; | |
3546 | } | |
3547 | module_init(modules_wq_init); | |
3548 | ||
be02a186 JK |
3549 | /* |
3550 | * This is where the real work happens. | |
3551 | * | |
3552 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3553 | * helper command 'lx-symbols'. | |
3554 | */ | |
3555 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3556 | { |
3557 | int ret = 0; | |
c7496379 RR |
3558 | struct mod_initfree *freeinit; |
3559 | ||
3560 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3561 | if (!freeinit) { | |
3562 | ret = -ENOMEM; | |
3563 | goto fail; | |
3564 | } | |
7523e4dc | 3565 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3566 | |
774a1221 TH |
3567 | /* |
3568 | * We want to find out whether @mod uses async during init. Clear | |
3569 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3570 | */ | |
3571 | current->flags &= ~PF_USED_ASYNC; | |
3572 | ||
34e1169d KC |
3573 | do_mod_ctors(mod); |
3574 | /* Start the module */ | |
3575 | if (mod->init != NULL) | |
3576 | ret = do_one_initcall(mod->init); | |
3577 | if (ret < 0) { | |
c7496379 | 3578 | goto fail_free_freeinit; |
34e1169d KC |
3579 | } |
3580 | if (ret > 0) { | |
bddb12b3 AM |
3581 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3582 | "follow 0/-E convention\n" | |
3583 | "%s: loading module anyway...\n", | |
3584 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3585 | dump_stack(); |
3586 | } | |
3587 | ||
3588 | /* Now it's a first class citizen! */ | |
3589 | mod->state = MODULE_STATE_LIVE; | |
3590 | blocking_notifier_call_chain(&module_notify_list, | |
3591 | MODULE_STATE_LIVE, mod); | |
3592 | ||
774a1221 TH |
3593 | /* |
3594 | * We need to finish all async code before the module init sequence | |
3595 | * is done. This has potential to deadlock. For example, a newly | |
3596 | * detected block device can trigger request_module() of the | |
3597 | * default iosched from async probing task. Once userland helper | |
3598 | * reaches here, async_synchronize_full() will wait on the async | |
3599 | * task waiting on request_module() and deadlock. | |
3600 | * | |
3601 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3602 | * iff module init queued any async jobs. This isn't a full | |
3603 | * solution as it will deadlock the same if module loading from | |
3604 | * async jobs nests more than once; however, due to the various | |
3605 | * constraints, this hack seems to be the best option for now. | |
3606 | * Please refer to the following thread for details. | |
3607 | * | |
3608 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3609 | */ | |
f2411da7 | 3610 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3611 | async_synchronize_full(); |
34e1169d | 3612 | |
aba4b5c2 | 3613 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3614 | mod->init_layout.size); |
34e1169d KC |
3615 | mutex_lock(&module_mutex); |
3616 | /* Drop initial reference. */ | |
3617 | module_put(mod); | |
3618 | trim_init_extable(mod); | |
3619 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3620 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3621 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3622 | #endif |
444d13ff | 3623 | module_enable_ro(mod, true); |
93c2e105 | 3624 | mod_tree_remove_init(mod); |
d453cded | 3625 | module_arch_freeing_init(mod); |
7523e4dc RR |
3626 | mod->init_layout.base = NULL; |
3627 | mod->init_layout.size = 0; | |
3628 | mod->init_layout.ro_size = 0; | |
444d13ff | 3629 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3630 | mod->init_layout.text_size = 0; |
c7496379 RR |
3631 | /* |
3632 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3633 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3634 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3635 | * path. module_memfree() cannot be called in an interrupt, so do the |
3636 | * work and call synchronize_rcu() in a work queue. | |
3637 | * | |
ae646f0b JH |
3638 | * Note that module_alloc() on most architectures creates W+X page |
3639 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3640 | * code such as mark_rodata_ro() which depends on those mappings to | |
3641 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3642 | * rcu_barrier() |
c7496379 | 3643 | */ |
1a7b7d92 RE |
3644 | if (llist_add(&freeinit->node, &init_free_list)) |
3645 | schedule_work(&init_free_wq); | |
3646 | ||
34e1169d KC |
3647 | mutex_unlock(&module_mutex); |
3648 | wake_up_all(&module_wq); | |
3649 | ||
3650 | return 0; | |
c7496379 RR |
3651 | |
3652 | fail_free_freeinit: | |
3653 | kfree(freeinit); | |
3654 | fail: | |
3655 | /* Try to protect us from buggy refcounters. */ | |
3656 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3657 | synchronize_rcu(); |
c7496379 RR |
3658 | module_put(mod); |
3659 | blocking_notifier_call_chain(&module_notify_list, | |
3660 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3661 | klp_module_going(mod); |
7dcd182b | 3662 | ftrace_release_mod(mod); |
c7496379 RR |
3663 | free_module(mod); |
3664 | wake_up_all(&module_wq); | |
3665 | return ret; | |
34e1169d KC |
3666 | } |
3667 | ||
3668 | static int may_init_module(void) | |
3669 | { | |
3670 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3671 | return -EPERM; | |
3672 | ||
3673 | return 0; | |
3674 | } | |
3675 | ||
a3535c7e RR |
3676 | /* |
3677 | * We try to place it in the list now to make sure it's unique before | |
3678 | * we dedicate too many resources. In particular, temporary percpu | |
3679 | * memory exhaustion. | |
3680 | */ | |
3681 | static int add_unformed_module(struct module *mod) | |
3682 | { | |
3683 | int err; | |
3684 | struct module *old; | |
3685 | ||
3686 | mod->state = MODULE_STATE_UNFORMED; | |
3687 | ||
3688 | again: | |
3689 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3690 | old = find_module_all(mod->name, strlen(mod->name), true); |
3691 | if (old != NULL) { | |
6e6de3de | 3692 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
3693 | /* Wait in case it fails to load. */ |
3694 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3695 | err = wait_event_interruptible(module_wq, |
3696 | finished_loading(mod->name)); | |
a3535c7e RR |
3697 | if (err) |
3698 | goto out_unlocked; | |
3699 | goto again; | |
3700 | } | |
3701 | err = -EEXIST; | |
3702 | goto out; | |
3703 | } | |
4f666546 | 3704 | mod_update_bounds(mod); |
a3535c7e | 3705 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3706 | mod_tree_insert(mod); |
a3535c7e RR |
3707 | err = 0; |
3708 | ||
3709 | out: | |
3710 | mutex_unlock(&module_mutex); | |
3711 | out_unlocked: | |
3712 | return err; | |
3713 | } | |
3714 | ||
3715 | static int complete_formation(struct module *mod, struct load_info *info) | |
3716 | { | |
3717 | int err; | |
3718 | ||
3719 | mutex_lock(&module_mutex); | |
3720 | ||
3721 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3722 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3723 | if (err < 0) |
3724 | goto out; | |
3725 | ||
3726 | /* This relies on module_mutex for list integrity. */ | |
3727 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3728 | ||
444d13ff | 3729 | module_enable_ro(mod, false); |
85c898db | 3730 | module_enable_nx(mod); |
4982223e | 3731 | |
a3535c7e RR |
3732 | /* Mark state as coming so strong_try_module_get() ignores us, |
3733 | * but kallsyms etc. can see us. */ | |
3734 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3735 | mutex_unlock(&module_mutex); |
3736 | ||
4982223e | 3737 | return 0; |
a3535c7e RR |
3738 | |
3739 | out: | |
3740 | mutex_unlock(&module_mutex); | |
3741 | return err; | |
3742 | } | |
3743 | ||
4c973d16 JY |
3744 | static int prepare_coming_module(struct module *mod) |
3745 | { | |
7e545d6e JY |
3746 | int err; |
3747 | ||
4c973d16 | 3748 | ftrace_module_enable(mod); |
7e545d6e JY |
3749 | err = klp_module_coming(mod); |
3750 | if (err) | |
3751 | return err; | |
3752 | ||
e585e646 DI |
3753 | /* Make module executable after ftrace is enabled */ |
3754 | mutex_lock(&module_mutex); | |
3755 | module_enable_x(mod); | |
3756 | mutex_unlock(&module_mutex); | |
3757 | ||
4c973d16 JY |
3758 | blocking_notifier_call_chain(&module_notify_list, |
3759 | MODULE_STATE_COMING, mod); | |
3760 | return 0; | |
3761 | } | |
3762 | ||
ecc86170 LR |
3763 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3764 | void *arg) | |
54041d8a | 3765 | { |
f2411da7 LR |
3766 | struct module *mod = arg; |
3767 | int ret; | |
3768 | ||
3769 | if (strcmp(param, "async_probe") == 0) { | |
3770 | mod->async_probe_requested = true; | |
3771 | return 0; | |
3772 | } | |
3773 | ||
6da0b565 | 3774 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3775 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3776 | if (ret != 0) |
3777 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3778 | return 0; |
3779 | } | |
3780 | ||
d913188c RR |
3781 | /* Allocate and load the module: note that size of section 0 is always |
3782 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3783 | static int load_module(struct load_info *info, const char __user *uargs, |
3784 | int flags) | |
d913188c | 3785 | { |
a3535c7e | 3786 | struct module *mod; |
5fdc7db6 | 3787 | long err = 0; |
51e158c1 | 3788 | char *after_dashes; |
d913188c | 3789 | |
5fdc7db6 JY |
3790 | err = elf_header_check(info); |
3791 | if (err) | |
3792 | goto free_copy; | |
3793 | ||
3794 | err = setup_load_info(info, flags); | |
3795 | if (err) | |
3796 | goto free_copy; | |
3797 | ||
3798 | if (blacklisted(info->name)) { | |
3799 | err = -EPERM; | |
3800 | goto free_copy; | |
3801 | } | |
3802 | ||
bca014ca | 3803 | err = module_sig_check(info, flags); |
34e1169d KC |
3804 | if (err) |
3805 | goto free_copy; | |
d913188c | 3806 | |
5fdc7db6 | 3807 | err = rewrite_section_headers(info, flags); |
d913188c | 3808 | if (err) |
34e1169d | 3809 | goto free_copy; |
d913188c | 3810 | |
5fdc7db6 JY |
3811 | /* Check module struct version now, before we try to use module. */ |
3812 | if (!check_modstruct_version(info, info->mod)) { | |
3813 | err = -ENOEXEC; | |
3814 | goto free_copy; | |
3815 | } | |
3816 | ||
d913188c | 3817 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3818 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3819 | if (IS_ERR(mod)) { |
3820 | err = PTR_ERR(mod); | |
d913188c | 3821 | goto free_copy; |
1da177e4 | 3822 | } |
1da177e4 | 3823 | |
ca86cad7 RGB |
3824 | audit_log_kern_module(mod->name); |
3825 | ||
a3535c7e RR |
3826 | /* Reserve our place in the list. */ |
3827 | err = add_unformed_module(mod); | |
3828 | if (err) | |
1fb9341a | 3829 | goto free_module; |
1fb9341a | 3830 | |
106a4ee2 | 3831 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3832 | mod->sig_ok = info->sig_ok; |
64748a2c | 3833 | if (!mod->sig_ok) { |
bddb12b3 | 3834 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3835 | "and/or required key missing - tainting " |
bddb12b3 | 3836 | "kernel\n", mod->name); |
66cc69e3 | 3837 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3838 | } |
106a4ee2 RR |
3839 | #endif |
3840 | ||
8d8022e8 | 3841 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3842 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3843 | if (err) |
3844 | goto unlink_mod; | |
3845 | ||
49668688 | 3846 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3847 | err = module_unload_init(mod); |
3848 | if (err) | |
1fb9341a | 3849 | goto unlink_mod; |
1da177e4 | 3850 | |
cf2fde7b | 3851 | init_param_lock(mod); |
b51d23e4 | 3852 | |
22e268eb RR |
3853 | /* Now we've got everything in the final locations, we can |
3854 | * find optional sections. */ | |
eb3057df FH |
3855 | err = find_module_sections(mod, info); |
3856 | if (err) | |
3857 | goto free_unload; | |
9b37ccfc | 3858 | |
49668688 | 3859 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3860 | if (err) |
3861 | goto free_unload; | |
9841d61d | 3862 | |
c988d2b2 | 3863 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3864 | setup_modinfo(mod, info); |
c988d2b2 | 3865 | |
1da177e4 | 3866 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3867 | err = simplify_symbols(mod, info); |
1da177e4 | 3868 | if (err < 0) |
d913188c | 3869 | goto free_modinfo; |
1da177e4 | 3870 | |
34e1169d | 3871 | err = apply_relocations(mod, info); |
22e268eb | 3872 | if (err < 0) |
d913188c | 3873 | goto free_modinfo; |
1da177e4 | 3874 | |
34e1169d | 3875 | err = post_relocation(mod, info); |
1da177e4 | 3876 | if (err < 0) |
d913188c | 3877 | goto free_modinfo; |
1da177e4 | 3878 | |
22e268eb | 3879 | flush_module_icache(mod); |
378bac82 | 3880 | |
6526c534 RR |
3881 | /* Now copy in args */ |
3882 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3883 | if (IS_ERR(mod->args)) { | |
3884 | err = PTR_ERR(mod->args); | |
3885 | goto free_arch_cleanup; | |
3886 | } | |
8d3b33f6 | 3887 | |
52796312 | 3888 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3889 | |
a949ae56 SRRH |
3890 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3891 | ftrace_module_init(mod); | |
3892 | ||
a3535c7e RR |
3893 | /* Finally it's fully formed, ready to start executing. */ |
3894 | err = complete_formation(mod, info); | |
3895 | if (err) | |
1fb9341a | 3896 | goto ddebug_cleanup; |
be593f4c | 3897 | |
4c973d16 JY |
3898 | err = prepare_coming_module(mod); |
3899 | if (err) | |
3900 | goto bug_cleanup; | |
3901 | ||
51f3d0f4 | 3902 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3903 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3904 | -32768, 32767, mod, |
ecc86170 | 3905 | unknown_module_param_cb); |
51e158c1 RR |
3906 | if (IS_ERR(after_dashes)) { |
3907 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3908 | goto coming_cleanup; |
51e158c1 RR |
3909 | } else if (after_dashes) { |
3910 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3911 | mod->name, after_dashes); | |
3912 | } | |
1da177e4 | 3913 | |
ca86cad7 | 3914 | /* Link in to sysfs. */ |
34e1169d | 3915 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3916 | if (err < 0) |
4c973d16 | 3917 | goto coming_cleanup; |
80a3d1bb | 3918 | |
1ce15ef4 JY |
3919 | if (is_livepatch_module(mod)) { |
3920 | err = copy_module_elf(mod, info); | |
3921 | if (err < 0) | |
3922 | goto sysfs_cleanup; | |
3923 | } | |
3924 | ||
48fd1188 | 3925 | /* Get rid of temporary copy. */ |
34e1169d | 3926 | free_copy(info); |
1da177e4 LT |
3927 | |
3928 | /* Done! */ | |
51f3d0f4 | 3929 | trace_module_load(mod); |
34e1169d KC |
3930 | |
3931 | return do_init_module(mod); | |
1da177e4 | 3932 | |
1ce15ef4 JY |
3933 | sysfs_cleanup: |
3934 | mod_sysfs_teardown(mod); | |
4c973d16 | 3935 | coming_cleanup: |
885a78d4 | 3936 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3937 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3938 | blocking_notifier_call_chain(&module_notify_list, |
3939 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3940 | klp_module_going(mod); |
1fb9341a RR |
3941 | bug_cleanup: |
3942 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3943 | mutex_lock(&module_mutex); |
5336377d | 3944 | module_bug_cleanup(mod); |
ee61abb3 | 3945 | mutex_unlock(&module_mutex); |
ff7e0055 | 3946 | |
a3535c7e | 3947 | ddebug_cleanup: |
1323eac7 | 3948 | ftrace_release_mod(mod); |
52796312 | 3949 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 3950 | synchronize_rcu(); |
6526c534 RR |
3951 | kfree(mod->args); |
3952 | free_arch_cleanup: | |
1da177e4 | 3953 | module_arch_cleanup(mod); |
d913188c | 3954 | free_modinfo: |
a263f776 | 3955 | free_modinfo(mod); |
22e268eb | 3956 | free_unload: |
1da177e4 | 3957 | module_unload_free(mod); |
1fb9341a RR |
3958 | unlink_mod: |
3959 | mutex_lock(&module_mutex); | |
3960 | /* Unlink carefully: kallsyms could be walking list. */ | |
3961 | list_del_rcu(&mod->list); | |
758556bd | 3962 | mod_tree_remove(mod); |
1fb9341a | 3963 | wake_up_all(&module_wq); |
0be964be | 3964 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 3965 | synchronize_rcu(); |
1fb9341a | 3966 | mutex_unlock(&module_mutex); |
d913188c | 3967 | free_module: |
35a9393c | 3968 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3969 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3970 | |
34e1169d | 3971 | module_deallocate(mod, info); |
d913188c | 3972 | free_copy: |
34e1169d KC |
3973 | free_copy(info); |
3974 | return err; | |
b99b87f7 PO |
3975 | } |
3976 | ||
17da2bd9 HC |
3977 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3978 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3979 | { |
34e1169d KC |
3980 | int err; |
3981 | struct load_info info = { }; | |
1da177e4 | 3982 | |
34e1169d KC |
3983 | err = may_init_module(); |
3984 | if (err) | |
3985 | return err; | |
1da177e4 | 3986 | |
34e1169d KC |
3987 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3988 | umod, len, uargs); | |
1da177e4 | 3989 | |
34e1169d KC |
3990 | err = copy_module_from_user(umod, len, &info); |
3991 | if (err) | |
3992 | return err; | |
1da177e4 | 3993 | |
2f3238ae | 3994 | return load_module(&info, uargs, 0); |
34e1169d | 3995 | } |
94462ad3 | 3996 | |
2f3238ae | 3997 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3998 | { |
34e1169d | 3999 | struct load_info info = { }; |
a1db7420 MZ |
4000 | loff_t size; |
4001 | void *hdr; | |
4002 | int err; | |
94462ad3 | 4003 | |
34e1169d KC |
4004 | err = may_init_module(); |
4005 | if (err) | |
4006 | return err; | |
1da177e4 | 4007 | |
2f3238ae | 4008 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 4009 | |
2f3238ae RR |
4010 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
4011 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
4012 | return -EINVAL; | |
d6de2c80 | 4013 | |
a1db7420 MZ |
4014 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
4015 | READING_MODULE); | |
34e1169d KC |
4016 | if (err) |
4017 | return err; | |
a1db7420 MZ |
4018 | info.hdr = hdr; |
4019 | info.len = size; | |
1da177e4 | 4020 | |
2f3238ae | 4021 | return load_module(&info, uargs, flags); |
1da177e4 LT |
4022 | } |
4023 | ||
4024 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
4025 | { | |
4026 | return ((void *)addr >= start && (void *)addr < start + size); | |
4027 | } | |
4028 | ||
4029 | #ifdef CONFIG_KALLSYMS | |
4030 | /* | |
4031 | * This ignores the intensely annoying "mapping symbols" found | |
4032 | * in ARM ELF files: $a, $t and $d. | |
4033 | */ | |
4034 | static inline int is_arm_mapping_symbol(const char *str) | |
4035 | { | |
2e3a10a1 RK |
4036 | if (str[0] == '.' && str[1] == 'L') |
4037 | return true; | |
6c34f1f5 | 4038 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
4039 | && (str[2] == '\0' || str[2] == '.'); |
4040 | } | |
4041 | ||
2d25bc55 | 4042 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 4043 | { |
8244062e | 4044 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
4045 | } |
4046 | ||
2d25bc55 JY |
4047 | /* |
4048 | * Given a module and address, find the corresponding symbol and return its name | |
4049 | * while providing its size and offset if needed. | |
4050 | */ | |
4051 | static const char *find_kallsyms_symbol(struct module *mod, | |
4052 | unsigned long addr, | |
4053 | unsigned long *size, | |
4054 | unsigned long *offset) | |
1da177e4 LT |
4055 | { |
4056 | unsigned int i, best = 0; | |
93d77e7f | 4057 | unsigned long nextval, bestval; |
8244062e | 4058 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
4059 | |
4060 | /* At worse, next value is at end of module */ | |
a06f6211 | 4061 | if (within_module_init(addr, mod)) |
7523e4dc | 4062 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 4063 | else |
7523e4dc | 4064 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 4065 | |
93d77e7f VW |
4066 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
4067 | ||
25985edc | 4068 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 4069 | starts real symbols at 1). */ |
8244062e | 4070 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
4071 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
4072 | unsigned long thisval = kallsyms_symbol_value(sym); | |
4073 | ||
4074 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
4075 | continue; |
4076 | ||
4077 | /* We ignore unnamed symbols: they're uninformative | |
4078 | * and inserted at a whim. */ | |
2d25bc55 JY |
4079 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
4080 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
4081 | continue; |
4082 | ||
93d77e7f | 4083 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 4084 | best = i; |
93d77e7f VW |
4085 | bestval = thisval; |
4086 | } | |
4087 | if (thisval > addr && thisval < nextval) | |
4088 | nextval = thisval; | |
1da177e4 LT |
4089 | } |
4090 | ||
4091 | if (!best) | |
4092 | return NULL; | |
4093 | ||
ffb45122 | 4094 | if (size) |
93d77e7f | 4095 | *size = nextval - bestval; |
ffb45122 | 4096 | if (offset) |
93d77e7f | 4097 | *offset = addr - bestval; |
2d25bc55 JY |
4098 | |
4099 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
4100 | } |
4101 | ||
b865ea64 SS |
4102 | void * __weak dereference_module_function_descriptor(struct module *mod, |
4103 | void *ptr) | |
4104 | { | |
4105 | return ptr; | |
4106 | } | |
4107 | ||
6dd06c9f RR |
4108 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
4109 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 4110 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
4111 | unsigned long *size, |
4112 | unsigned long *offset, | |
4113 | char **modname, | |
4114 | char *namebuf) | |
1da177e4 | 4115 | { |
cb2a5205 | 4116 | const char *ret = NULL; |
b7df4d1b | 4117 | struct module *mod; |
1da177e4 | 4118 | |
cb2a5205 | 4119 | preempt_disable(); |
b7df4d1b PZ |
4120 | mod = __module_address(addr); |
4121 | if (mod) { | |
4122 | if (modname) | |
4123 | *modname = mod->name; | |
2d25bc55 JY |
4124 | |
4125 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4126 | } |
6dd06c9f RR |
4127 | /* Make a copy in here where it's safe */ |
4128 | if (ret) { | |
4129 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4130 | ret = namebuf; | |
4131 | } | |
cb2a5205 | 4132 | preempt_enable(); |
b7df4d1b | 4133 | |
92dfc9dc | 4134 | return ret; |
1da177e4 LT |
4135 | } |
4136 | ||
9d65cb4a AD |
4137 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4138 | { | |
4139 | struct module *mod; | |
4140 | ||
cb2a5205 | 4141 | preempt_disable(); |
d72b3751 | 4142 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4143 | if (mod->state == MODULE_STATE_UNFORMED) |
4144 | continue; | |
9b20a352 | 4145 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4146 | const char *sym; |
4147 | ||
2d25bc55 | 4148 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4149 | if (!sym) |
4150 | goto out; | |
2d25bc55 | 4151 | |
9281acea | 4152 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4153 | preempt_enable(); |
9d65cb4a AD |
4154 | return 0; |
4155 | } | |
4156 | } | |
4157 | out: | |
cb2a5205 | 4158 | preempt_enable(); |
9d65cb4a AD |
4159 | return -ERANGE; |
4160 | } | |
4161 | ||
a5c43dae AD |
4162 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4163 | unsigned long *offset, char *modname, char *name) | |
4164 | { | |
4165 | struct module *mod; | |
4166 | ||
cb2a5205 | 4167 | preempt_disable(); |
d72b3751 | 4168 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4169 | if (mod->state == MODULE_STATE_UNFORMED) |
4170 | continue; | |
9b20a352 | 4171 | if (within_module(addr, mod)) { |
a5c43dae AD |
4172 | const char *sym; |
4173 | ||
2d25bc55 | 4174 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4175 | if (!sym) |
4176 | goto out; | |
4177 | if (modname) | |
9281acea | 4178 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4179 | if (name) |
9281acea | 4180 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4181 | preempt_enable(); |
a5c43dae AD |
4182 | return 0; |
4183 | } | |
4184 | } | |
4185 | out: | |
cb2a5205 | 4186 | preempt_enable(); |
a5c43dae AD |
4187 | return -ERANGE; |
4188 | } | |
4189 | ||
ea07890a AD |
4190 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4191 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4192 | { |
4193 | struct module *mod; | |
4194 | ||
cb2a5205 | 4195 | preempt_disable(); |
d72b3751 | 4196 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4197 | struct mod_kallsyms *kallsyms; |
4198 | ||
0d21b0e3 RR |
4199 | if (mod->state == MODULE_STATE_UNFORMED) |
4200 | continue; | |
8244062e RR |
4201 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4202 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4203 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4204 | ||
4205 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4206 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4207 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4208 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4209 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4210 | preempt_enable(); |
ea07890a | 4211 | return 0; |
1da177e4 | 4212 | } |
8244062e | 4213 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4214 | } |
cb2a5205 | 4215 | preempt_enable(); |
ea07890a | 4216 | return -ERANGE; |
1da177e4 LT |
4217 | } |
4218 | ||
2d25bc55 JY |
4219 | /* Given a module and name of symbol, find and return the symbol's value */ |
4220 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4221 | { |
4222 | unsigned int i; | |
8244062e | 4223 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4224 | |
93d77e7f VW |
4225 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4226 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4227 | ||
2d25bc55 | 4228 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4229 | sym->st_shndx != SHN_UNDEF) |
4230 | return kallsyms_symbol_value(sym); | |
4231 | } | |
1da177e4 LT |
4232 | return 0; |
4233 | } | |
4234 | ||
4235 | /* Look for this name: can be of form module:name. */ | |
4236 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4237 | { | |
4238 | struct module *mod; | |
4239 | char *colon; | |
4240 | unsigned long ret = 0; | |
4241 | ||
4242 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4243 | preempt_disable(); |
17586188 | 4244 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4245 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4246 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4247 | } else { |
0d21b0e3 RR |
4248 | list_for_each_entry_rcu(mod, &modules, list) { |
4249 | if (mod->state == MODULE_STATE_UNFORMED) | |
4250 | continue; | |
2d25bc55 | 4251 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4252 | break; |
0d21b0e3 | 4253 | } |
1da177e4 | 4254 | } |
cb2a5205 | 4255 | preempt_enable(); |
1da177e4 LT |
4256 | return ret; |
4257 | } | |
75a66614 AK |
4258 | |
4259 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4260 | struct module *, unsigned long), | |
4261 | void *data) | |
4262 | { | |
4263 | struct module *mod; | |
4264 | unsigned int i; | |
4265 | int ret; | |
4266 | ||
0be964be PZ |
4267 | module_assert_mutex(); |
4268 | ||
75a66614 | 4269 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4270 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4271 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4272 | ||
0d21b0e3 RR |
4273 | if (mod->state == MODULE_STATE_UNFORMED) |
4274 | continue; | |
8244062e | 4275 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4276 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4277 | |
93d77e7f | 4278 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4279 | continue; |
4280 | ||
2d25bc55 | 4281 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4282 | mod, kallsyms_symbol_value(sym)); |
75a66614 AK |
4283 | if (ret != 0) |
4284 | return ret; | |
4285 | } | |
4286 | } | |
4287 | return 0; | |
4288 | } | |
1da177e4 LT |
4289 | #endif /* CONFIG_KALLSYMS */ |
4290 | ||
7fd8329b PM |
4291 | /* Maximum number of characters written by module_flags() */ |
4292 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4293 | ||
4294 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4295 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4296 | { |
4297 | int bx = 0; | |
4298 | ||
0d21b0e3 | 4299 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4300 | if (mod->taints || |
4301 | mod->state == MODULE_STATE_GOING || | |
4302 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4303 | buf[bx++] = '('; |
cca3e707 | 4304 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4305 | /* Show a - for module-is-being-unloaded */ |
4306 | if (mod->state == MODULE_STATE_GOING) | |
4307 | buf[bx++] = '-'; | |
4308 | /* Show a + for module-is-being-loaded */ | |
4309 | if (mod->state == MODULE_STATE_COMING) | |
4310 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4311 | buf[bx++] = ')'; |
4312 | } | |
4313 | buf[bx] = '\0'; | |
4314 | ||
4315 | return buf; | |
4316 | } | |
4317 | ||
3b5d5c6b AD |
4318 | #ifdef CONFIG_PROC_FS |
4319 | /* Called by the /proc file system to return a list of modules. */ | |
4320 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4321 | { | |
4322 | mutex_lock(&module_mutex); | |
4323 | return seq_list_start(&modules, *pos); | |
4324 | } | |
4325 | ||
4326 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4327 | { | |
4328 | return seq_list_next(p, &modules, pos); | |
4329 | } | |
4330 | ||
4331 | static void m_stop(struct seq_file *m, void *p) | |
4332 | { | |
4333 | mutex_unlock(&module_mutex); | |
4334 | } | |
4335 | ||
1da177e4 LT |
4336 | static int m_show(struct seq_file *m, void *p) |
4337 | { | |
4338 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4339 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4340 | void *value; |
fa3ba2e8 | 4341 | |
0d21b0e3 RR |
4342 | /* We always ignore unformed modules. */ |
4343 | if (mod->state == MODULE_STATE_UNFORMED) | |
4344 | return 0; | |
4345 | ||
2f0f2a33 | 4346 | seq_printf(m, "%s %u", |
7523e4dc | 4347 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4348 | print_unload_info(m, mod); |
4349 | ||
4350 | /* Informative for users. */ | |
4351 | seq_printf(m, " %s", | |
6da0b565 IA |
4352 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4353 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4354 | "Live"); |
4355 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4356 | value = m->private ? NULL : mod->core_layout.base; |
4357 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4358 | |
fa3ba2e8 FM |
4359 | /* Taints info */ |
4360 | if (mod->taints) | |
21aa9280 | 4361 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4362 | |
6da0b565 | 4363 | seq_puts(m, "\n"); |
1da177e4 LT |
4364 | return 0; |
4365 | } | |
4366 | ||
4367 | /* Format: modulename size refcount deps address | |
4368 | ||
4369 | Where refcount is a number or -, and deps is a comma-separated list | |
4370 | of depends or -. | |
4371 | */ | |
3b5d5c6b | 4372 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4373 | .start = m_start, |
4374 | .next = m_next, | |
4375 | .stop = m_stop, | |
4376 | .show = m_show | |
4377 | }; | |
4378 | ||
516fb7f2 LT |
4379 | /* |
4380 | * This also sets the "private" pointer to non-NULL if the | |
4381 | * kernel pointers should be hidden (so you can just test | |
4382 | * "m->private" to see if you should keep the values private). | |
4383 | * | |
4384 | * We use the same logic as for /proc/kallsyms. | |
4385 | */ | |
3b5d5c6b AD |
4386 | static int modules_open(struct inode *inode, struct file *file) |
4387 | { | |
516fb7f2 LT |
4388 | int err = seq_open(file, &modules_op); |
4389 | ||
4390 | if (!err) { | |
4391 | struct seq_file *m = file->private_data; | |
4392 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4393 | } | |
4394 | ||
3f553b30 | 4395 | return err; |
3b5d5c6b AD |
4396 | } |
4397 | ||
4398 | static const struct file_operations proc_modules_operations = { | |
4399 | .open = modules_open, | |
4400 | .read = seq_read, | |
4401 | .llseek = seq_lseek, | |
4402 | .release = seq_release, | |
4403 | }; | |
4404 | ||
4405 | static int __init proc_modules_init(void) | |
4406 | { | |
4407 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4408 | return 0; | |
4409 | } | |
4410 | module_init(proc_modules_init); | |
4411 | #endif | |
4412 | ||
1da177e4 LT |
4413 | /* Given an address, look for it in the module exception tables. */ |
4414 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4415 | { | |
1da177e4 LT |
4416 | const struct exception_table_entry *e = NULL; |
4417 | struct module *mod; | |
4418 | ||
24da1cbf | 4419 | preempt_disable(); |
5ff22646 PZ |
4420 | mod = __module_address(addr); |
4421 | if (!mod) | |
4422 | goto out; | |
22a8bdeb | 4423 | |
5ff22646 PZ |
4424 | if (!mod->num_exentries) |
4425 | goto out; | |
4426 | ||
4427 | e = search_extable(mod->extable, | |
a94c33dd | 4428 | mod->num_exentries, |
5ff22646 PZ |
4429 | addr); |
4430 | out: | |
24da1cbf | 4431 | preempt_enable(); |
1da177e4 | 4432 | |
5ff22646 PZ |
4433 | /* |
4434 | * Now, if we found one, we are running inside it now, hence | |
4435 | * we cannot unload the module, hence no refcnt needed. | |
4436 | */ | |
1da177e4 LT |
4437 | return e; |
4438 | } | |
4439 | ||
4d435f9d | 4440 | /* |
e610499e RR |
4441 | * is_module_address - is this address inside a module? |
4442 | * @addr: the address to check. | |
4443 | * | |
4444 | * See is_module_text_address() if you simply want to see if the address | |
4445 | * is code (not data). | |
4d435f9d | 4446 | */ |
e610499e | 4447 | bool is_module_address(unsigned long addr) |
4d435f9d | 4448 | { |
e610499e | 4449 | bool ret; |
4d435f9d | 4450 | |
24da1cbf | 4451 | preempt_disable(); |
e610499e | 4452 | ret = __module_address(addr) != NULL; |
24da1cbf | 4453 | preempt_enable(); |
4d435f9d | 4454 | |
e610499e | 4455 | return ret; |
4d435f9d IM |
4456 | } |
4457 | ||
e610499e RR |
4458 | /* |
4459 | * __module_address - get the module which contains an address. | |
4460 | * @addr: the address. | |
4461 | * | |
4462 | * Must be called with preempt disabled or module mutex held so that | |
4463 | * module doesn't get freed during this. | |
4464 | */ | |
714f83d5 | 4465 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4466 | { |
4467 | struct module *mod; | |
4468 | ||
3a642e99 RR |
4469 | if (addr < module_addr_min || addr > module_addr_max) |
4470 | return NULL; | |
4471 | ||
0be964be PZ |
4472 | module_assert_mutex_or_preempt(); |
4473 | ||
6c9692e2 | 4474 | mod = mod_find(addr); |
93c2e105 PZ |
4475 | if (mod) { |
4476 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4477 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4478 | mod = NULL; |
0d21b0e3 | 4479 | } |
93c2e105 | 4480 | return mod; |
1da177e4 | 4481 | } |
c6b37801 | 4482 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4483 | |
e610499e RR |
4484 | /* |
4485 | * is_module_text_address - is this address inside module code? | |
4486 | * @addr: the address to check. | |
4487 | * | |
4488 | * See is_module_address() if you simply want to see if the address is | |
4489 | * anywhere in a module. See kernel_text_address() for testing if an | |
4490 | * address corresponds to kernel or module code. | |
4491 | */ | |
4492 | bool is_module_text_address(unsigned long addr) | |
4493 | { | |
4494 | bool ret; | |
4495 | ||
4496 | preempt_disable(); | |
4497 | ret = __module_text_address(addr) != NULL; | |
4498 | preempt_enable(); | |
4499 | ||
4500 | return ret; | |
4501 | } | |
4502 | ||
4503 | /* | |
4504 | * __module_text_address - get the module whose code contains an address. | |
4505 | * @addr: the address. | |
4506 | * | |
4507 | * Must be called with preempt disabled or module mutex held so that | |
4508 | * module doesn't get freed during this. | |
4509 | */ | |
4510 | struct module *__module_text_address(unsigned long addr) | |
4511 | { | |
4512 | struct module *mod = __module_address(addr); | |
4513 | if (mod) { | |
4514 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4515 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4516 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4517 | mod = NULL; |
4518 | } | |
4519 | return mod; | |
4520 | } | |
c6b37801 | 4521 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4522 | |
1da177e4 LT |
4523 | /* Don't grab lock, we're oopsing. */ |
4524 | void print_modules(void) | |
4525 | { | |
4526 | struct module *mod; | |
7fd8329b | 4527 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4528 | |
b231125a | 4529 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4530 | /* Most callers should already have preempt disabled, but make sure */ |
4531 | preempt_disable(); | |
0d21b0e3 RR |
4532 | list_for_each_entry_rcu(mod, &modules, list) { |
4533 | if (mod->state == MODULE_STATE_UNFORMED) | |
4534 | continue; | |
27bba4d6 | 4535 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4536 | } |
d72b3751 | 4537 | preempt_enable(); |
e14af7ee | 4538 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4539 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4540 | pr_cont("\n"); | |
1da177e4 LT |
4541 | } |
4542 | ||
1da177e4 | 4543 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4544 | /* Generate the signature for all relevant module structures here. |
4545 | * If these change, we don't want to try to parse the module. */ | |
4546 | void module_layout(struct module *mod, | |
4547 | struct modversion_info *ver, | |
4548 | struct kernel_param *kp, | |
4549 | struct kernel_symbol *ks, | |
65498646 | 4550 | struct tracepoint * const *tp) |
8c8ef42a RR |
4551 | { |
4552 | } | |
4553 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4554 | #endif |