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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 MC |
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 | 1035 | free_module(mod); |
5d603311 KK |
1036 | /* someone could wait for the module in add_unformed_module() */ |
1037 | wake_up_all(&module_wq); | |
75676500 RR |
1038 | return 0; |
1039 | out: | |
6389a385 | 1040 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1041 | return ret; |
1042 | } | |
1043 | ||
d1e99d7a | 1044 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1045 | { |
1046 | struct module_use *use; | |
1047 | int printed_something = 0; | |
1048 | ||
d5db139a | 1049 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1050 | |
6da0b565 IA |
1051 | /* |
1052 | * Always include a trailing , so userspace can differentiate | |
1053 | * between this and the old multi-field proc format. | |
1054 | */ | |
2c02dfe7 | 1055 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1056 | printed_something = 1; |
2c02dfe7 | 1057 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1058 | } |
1059 | ||
1da177e4 LT |
1060 | if (mod->init != NULL && mod->exit == NULL) { |
1061 | printed_something = 1; | |
6da0b565 | 1062 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | if (!printed_something) | |
6da0b565 | 1066 | seq_puts(m, "-"); |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | void __symbol_put(const char *symbol) | |
1070 | { | |
1071 | struct module *owner; | |
1da177e4 | 1072 | |
24da1cbf | 1073 | preempt_disable(); |
414fd31b | 1074 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1075 | BUG(); |
1076 | module_put(owner); | |
24da1cbf | 1077 | preempt_enable(); |
1da177e4 LT |
1078 | } |
1079 | EXPORT_SYMBOL(__symbol_put); | |
1080 | ||
7d1d16e4 | 1081 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1082 | void symbol_put_addr(void *addr) |
1083 | { | |
5e376613 | 1084 | struct module *modaddr; |
7d1d16e4 | 1085 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1086 | |
7d1d16e4 | 1087 | if (core_kernel_text(a)) |
5e376613 | 1088 | return; |
1da177e4 | 1089 | |
275d7d44 PZ |
1090 | /* |
1091 | * Even though we hold a reference on the module; we still need to | |
1092 | * disable preemption in order to safely traverse the data structure. | |
1093 | */ | |
1094 | preempt_disable(); | |
7d1d16e4 | 1095 | modaddr = __module_text_address(a); |
a6e6abd5 | 1096 | BUG_ON(!modaddr); |
5e376613 | 1097 | module_put(modaddr); |
275d7d44 | 1098 | preempt_enable(); |
1da177e4 LT |
1099 | } |
1100 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1101 | ||
1102 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1103 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1104 | { |
d5db139a | 1105 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1106 | } |
1107 | ||
cca3e707 KS |
1108 | static struct module_attribute modinfo_refcnt = |
1109 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1110 | |
d53799be SR |
1111 | void __module_get(struct module *module) |
1112 | { | |
1113 | if (module) { | |
1114 | preempt_disable(); | |
2f35c41f | 1115 | atomic_inc(&module->refcnt); |
d53799be SR |
1116 | trace_module_get(module, _RET_IP_); |
1117 | preempt_enable(); | |
1118 | } | |
1119 | } | |
1120 | EXPORT_SYMBOL(__module_get); | |
1121 | ||
1122 | bool try_module_get(struct module *module) | |
1123 | { | |
1124 | bool ret = true; | |
1125 | ||
1126 | if (module) { | |
1127 | preempt_disable(); | |
e513cc1c MH |
1128 | /* Note: here, we can fail to get a reference */ |
1129 | if (likely(module_is_live(module) && | |
1130 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1131 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1132 | else |
d53799be SR |
1133 | ret = false; |
1134 | ||
1135 | preempt_enable(); | |
1136 | } | |
1137 | return ret; | |
1138 | } | |
1139 | EXPORT_SYMBOL(try_module_get); | |
1140 | ||
f6a57033 AV |
1141 | void module_put(struct module *module) |
1142 | { | |
e513cc1c MH |
1143 | int ret; |
1144 | ||
f6a57033 | 1145 | if (module) { |
e1783a24 | 1146 | preempt_disable(); |
e513cc1c MH |
1147 | ret = atomic_dec_if_positive(&module->refcnt); |
1148 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1149 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1150 | preempt_enable(); |
f6a57033 AV |
1151 | } |
1152 | } | |
1153 | EXPORT_SYMBOL(module_put); | |
1154 | ||
1da177e4 | 1155 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1156 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1157 | { |
1158 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1159 | seq_puts(m, " - -"); |
1da177e4 LT |
1160 | } |
1161 | ||
1162 | static inline void module_unload_free(struct module *mod) | |
1163 | { | |
1164 | } | |
1165 | ||
9bea7f23 | 1166 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1167 | { |
9bea7f23 | 1168 | return strong_try_module_get(b); |
1da177e4 | 1169 | } |
9bea7f23 | 1170 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1171 | |
9f85a4bb | 1172 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1173 | { |
9f85a4bb | 1174 | return 0; |
1da177e4 LT |
1175 | } |
1176 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1177 | ||
53999bf3 KW |
1178 | static size_t module_flags_taint(struct module *mod, char *buf) |
1179 | { | |
1180 | size_t l = 0; | |
7fd8329b PM |
1181 | int i; |
1182 | ||
1183 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1184 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1185 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1186 | } |
53999bf3 | 1187 | |
53999bf3 KW |
1188 | return l; |
1189 | } | |
1190 | ||
1f71740a | 1191 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1192 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1193 | { |
1194 | const char *state = "unknown"; | |
1195 | ||
4befb026 | 1196 | switch (mk->mod->state) { |
1f71740a KS |
1197 | case MODULE_STATE_LIVE: |
1198 | state = "live"; | |
1199 | break; | |
1200 | case MODULE_STATE_COMING: | |
1201 | state = "coming"; | |
1202 | break; | |
1203 | case MODULE_STATE_GOING: | |
1204 | state = "going"; | |
1205 | break; | |
0d21b0e3 RR |
1206 | default: |
1207 | BUG(); | |
1f71740a KS |
1208 | } |
1209 | return sprintf(buffer, "%s\n", state); | |
1210 | } | |
1211 | ||
cca3e707 KS |
1212 | static struct module_attribute modinfo_initstate = |
1213 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1214 | |
88bfa324 KS |
1215 | static ssize_t store_uevent(struct module_attribute *mattr, |
1216 | struct module_kobject *mk, | |
1217 | const char *buffer, size_t count) | |
1218 | { | |
df44b479 PR |
1219 | int rc; |
1220 | ||
1221 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1222 | return rc ? rc : count; | |
88bfa324 KS |
1223 | } |
1224 | ||
cca3e707 KS |
1225 | struct module_attribute module_uevent = |
1226 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1227 | ||
1228 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1229 | struct module_kobject *mk, char *buffer) | |
1230 | { | |
7523e4dc | 1231 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1232 | } |
1233 | ||
1234 | static struct module_attribute modinfo_coresize = | |
1235 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1236 | ||
1237 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1238 | struct module_kobject *mk, char *buffer) | |
1239 | { | |
7523e4dc | 1240 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1241 | } |
1242 | ||
1243 | static struct module_attribute modinfo_initsize = | |
1244 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1245 | ||
1246 | static ssize_t show_taint(struct module_attribute *mattr, | |
1247 | struct module_kobject *mk, char *buffer) | |
1248 | { | |
1249 | size_t l; | |
1250 | ||
1251 | l = module_flags_taint(mk->mod, buffer); | |
1252 | buffer[l++] = '\n'; | |
1253 | return l; | |
1254 | } | |
1255 | ||
1256 | static struct module_attribute modinfo_taint = | |
1257 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1258 | |
03e88ae1 | 1259 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1260 | &module_uevent, |
03e88ae1 GKH |
1261 | &modinfo_version, |
1262 | &modinfo_srcversion, | |
cca3e707 KS |
1263 | &modinfo_initstate, |
1264 | &modinfo_coresize, | |
1265 | &modinfo_initsize, | |
1266 | &modinfo_taint, | |
03e88ae1 | 1267 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1268 | &modinfo_refcnt, |
03e88ae1 GKH |
1269 | #endif |
1270 | NULL, | |
1271 | }; | |
1272 | ||
1da177e4 LT |
1273 | static const char vermagic[] = VERMAGIC_STRING; |
1274 | ||
c6e665c8 | 1275 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1276 | { |
1277 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1278 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1279 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1280 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1281 | return 0; |
1282 | #else | |
1283 | return -ENOEXEC; | |
1284 | #endif | |
1285 | } | |
1286 | ||
1da177e4 | 1287 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1288 | |
1289 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1290 | { |
71810db2 | 1291 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1292 | } |
1293 | ||
49019426 | 1294 | static int check_version(const struct load_info *info, |
1da177e4 | 1295 | const char *symname, |
6da0b565 | 1296 | struct module *mod, |
71810db2 | 1297 | const s32 *crc) |
1da177e4 | 1298 | { |
49019426 KC |
1299 | Elf_Shdr *sechdrs = info->sechdrs; |
1300 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1301 | unsigned int i, num_versions; |
1302 | struct modversion_info *versions; | |
1303 | ||
1304 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1305 | if (!crc) | |
1306 | return 1; | |
1307 | ||
a5dd6970 RR |
1308 | /* No versions at all? modprobe --force does this. */ |
1309 | if (versindex == 0) | |
1310 | return try_to_force_load(mod, symname) == 0; | |
1311 | ||
1da177e4 LT |
1312 | versions = (void *) sechdrs[versindex].sh_addr; |
1313 | num_versions = sechdrs[versindex].sh_size | |
1314 | / sizeof(struct modversion_info); | |
1315 | ||
1316 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1317 | u32 crcval; |
1318 | ||
1da177e4 LT |
1319 | if (strcmp(versions[i].name, symname) != 0) |
1320 | continue; | |
1321 | ||
71810db2 AB |
1322 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1323 | crcval = resolve_rel_crc(crc); | |
1324 | else | |
1325 | crcval = *crc; | |
1326 | if (versions[i].crc == crcval) | |
1da177e4 | 1327 | return 1; |
71810db2 AB |
1328 | pr_debug("Found checksum %X vs module %lX\n", |
1329 | crcval, versions[i].crc); | |
826e4506 | 1330 | goto bad_version; |
1da177e4 | 1331 | } |
826e4506 | 1332 | |
faaae2a5 | 1333 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1334 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1335 | return 1; |
826e4506 LT |
1336 | |
1337 | bad_version: | |
6da0b565 | 1338 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1339 | info->name, symname); |
826e4506 | 1340 | return 0; |
1da177e4 LT |
1341 | } |
1342 | ||
49019426 | 1343 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1344 | struct module *mod) |
1345 | { | |
71810db2 | 1346 | const s32 *crc; |
1da177e4 | 1347 | |
926a59b1 PZ |
1348 | /* |
1349 | * Since this should be found in kernel (which can't be removed), no | |
1350 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1351 | */ | |
1352 | preempt_disable(); | |
996302c5 | 1353 | if (!find_symbol("module_layout", NULL, &crc, true, false)) { |
926a59b1 | 1354 | preempt_enable(); |
1da177e4 | 1355 | BUG(); |
926a59b1 PZ |
1356 | } |
1357 | preempt_enable(); | |
996302c5 | 1358 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1359 | } |
1360 | ||
91e37a79 RR |
1361 | /* First part is kernel version, which we ignore if module has crcs. */ |
1362 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1363 | bool has_crcs) | |
1da177e4 | 1364 | { |
91e37a79 RR |
1365 | if (has_crcs) { |
1366 | amagic += strcspn(amagic, " "); | |
1367 | bmagic += strcspn(bmagic, " "); | |
1368 | } | |
1da177e4 LT |
1369 | return strcmp(amagic, bmagic) == 0; |
1370 | } | |
1371 | #else | |
49019426 | 1372 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1373 | const char *symname, |
6da0b565 | 1374 | struct module *mod, |
71810db2 | 1375 | const s32 *crc) |
1da177e4 LT |
1376 | { |
1377 | return 1; | |
1378 | } | |
1379 | ||
49019426 | 1380 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1381 | struct module *mod) |
1382 | { | |
1383 | return 1; | |
1384 | } | |
1385 | ||
91e37a79 RR |
1386 | static inline int same_magic(const char *amagic, const char *bmagic, |
1387 | bool has_crcs) | |
1da177e4 LT |
1388 | { |
1389 | return strcmp(amagic, bmagic) == 0; | |
1390 | } | |
1391 | #endif /* CONFIG_MODVERSIONS */ | |
1392 | ||
8651ec01 MM |
1393 | static char *get_modinfo(const struct load_info *info, const char *tag); |
1394 | static char *get_next_modinfo(const struct load_info *info, const char *tag, | |
1395 | char *prev); | |
1396 | ||
1397 | static int verify_namespace_is_imported(const struct load_info *info, | |
1398 | const struct kernel_symbol *sym, | |
1399 | struct module *mod) | |
1400 | { | |
1401 | const char *namespace; | |
1402 | char *imported_namespace; | |
1403 | ||
1404 | namespace = kernel_symbol_namespace(sym); | |
c3a6cf19 | 1405 | if (namespace && namespace[0]) { |
8651ec01 MM |
1406 | imported_namespace = get_modinfo(info, "import_ns"); |
1407 | while (imported_namespace) { | |
1408 | if (strcmp(namespace, imported_namespace) == 0) | |
1409 | return 0; | |
1410 | imported_namespace = get_next_modinfo( | |
1411 | info, "import_ns", imported_namespace); | |
1412 | } | |
3d52ec5e MM |
1413 | #ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
1414 | pr_warn( | |
1415 | #else | |
1416 | pr_err( | |
1417 | #endif | |
1418 | "%s: module uses symbol (%s) from namespace %s, but does not import it.\n", | |
1419 | mod->name, kernel_symbol_name(sym), namespace); | |
1420 | #ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS | |
8651ec01 | 1421 | return -EINVAL; |
3d52ec5e | 1422 | #endif |
8651ec01 MM |
1423 | } |
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | ||
75676500 | 1428 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1429 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1430 | const struct load_info *info, | |
414fd31b | 1431 | const char *name, |
9bea7f23 | 1432 | char ownername[]) |
1da177e4 LT |
1433 | { |
1434 | struct module *owner; | |
414fd31b | 1435 | const struct kernel_symbol *sym; |
71810db2 | 1436 | const s32 *crc; |
9bea7f23 | 1437 | int err; |
1da177e4 | 1438 | |
d64810f5 PZ |
1439 | /* |
1440 | * The module_mutex should not be a heavily contended lock; | |
1441 | * if we get the occasional sleep here, we'll go an extra iteration | |
1442 | * in the wait_event_interruptible(), which is harmless. | |
1443 | */ | |
1444 | sched_annotate_sleep(); | |
75676500 | 1445 | mutex_lock(&module_mutex); |
414fd31b | 1446 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1447 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1448 | if (!sym) |
1449 | goto unlock; | |
1450 | ||
49019426 | 1451 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1452 | sym = ERR_PTR(-EINVAL); |
1453 | goto getname; | |
1da177e4 | 1454 | } |
9bea7f23 | 1455 | |
8651ec01 MM |
1456 | err = verify_namespace_is_imported(info, sym, mod); |
1457 | if (err) { | |
1458 | sym = ERR_PTR(err); | |
1459 | goto getname; | |
1460 | } | |
1461 | ||
9bea7f23 RR |
1462 | err = ref_module(mod, owner); |
1463 | if (err) { | |
1464 | sym = ERR_PTR(err); | |
1465 | goto getname; | |
1466 | } | |
1467 | ||
1468 | getname: | |
1469 | /* We must make copy under the lock if we failed to get ref. */ | |
1470 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1471 | unlock: | |
75676500 | 1472 | mutex_unlock(&module_mutex); |
218ce735 | 1473 | return sym; |
1da177e4 LT |
1474 | } |
1475 | ||
49668688 RR |
1476 | static const struct kernel_symbol * |
1477 | resolve_symbol_wait(struct module *mod, | |
1478 | const struct load_info *info, | |
1479 | const char *name) | |
9bea7f23 RR |
1480 | { |
1481 | const struct kernel_symbol *ksym; | |
49668688 | 1482 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1483 | |
1484 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1485 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1486 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1487 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1488 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1489 | mod->name, owner); | |
9bea7f23 RR |
1490 | } |
1491 | return ksym; | |
1492 | } | |
1493 | ||
1da177e4 LT |
1494 | /* |
1495 | * /sys/module/foo/sections stuff | |
1496 | * J. Corbet <corbet@lwn.net> | |
1497 | */ | |
8f6d0378 | 1498 | #ifdef CONFIG_SYSFS |
10b465aa | 1499 | |
8f6d0378 | 1500 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1501 | static inline bool sect_empty(const Elf_Shdr *sect) |
1502 | { | |
1503 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1504 | } | |
1505 | ||
6da0b565 | 1506 | struct module_sect_attr { |
a58730c4 RR |
1507 | struct module_attribute mattr; |
1508 | char *name; | |
1509 | unsigned long address; | |
1510 | }; | |
1511 | ||
6da0b565 | 1512 | struct module_sect_attrs { |
a58730c4 RR |
1513 | struct attribute_group grp; |
1514 | unsigned int nsections; | |
1515 | struct module_sect_attr attrs[0]; | |
1516 | }; | |
1517 | ||
1da177e4 | 1518 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1519 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1520 | { |
1521 | struct module_sect_attr *sattr = | |
1522 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1523 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1524 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1525 | } |
1526 | ||
04b1db9f IN |
1527 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1528 | { | |
a58730c4 | 1529 | unsigned int section; |
04b1db9f IN |
1530 | |
1531 | for (section = 0; section < sect_attrs->nsections; section++) | |
1532 | kfree(sect_attrs->attrs[section].name); | |
1533 | kfree(sect_attrs); | |
1534 | } | |
1535 | ||
8f6d0378 | 1536 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1537 | { |
1538 | unsigned int nloaded = 0, i, size[2]; | |
1539 | struct module_sect_attrs *sect_attrs; | |
1540 | struct module_sect_attr *sattr; | |
1541 | struct attribute **gattr; | |
22a8bdeb | 1542 | |
1da177e4 | 1543 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1544 | for (i = 0; i < info->hdr->e_shnum; i++) |
1545 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 | 1546 | nloaded++; |
8d1b73dd | 1547 | size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
1da177e4 LT |
1548 | sizeof(sect_attrs->grp.attrs[0])); |
1549 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1550 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1551 | if (sect_attrs == NULL) | |
1da177e4 LT |
1552 | return; |
1553 | ||
1554 | /* Setup section attributes. */ | |
1555 | sect_attrs->grp.name = "sections"; | |
1556 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1557 | ||
04b1db9f | 1558 | sect_attrs->nsections = 0; |
1da177e4 LT |
1559 | sattr = §_attrs->attrs[0]; |
1560 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1561 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1562 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1563 | if (sect_empty(sec)) | |
35dead42 | 1564 | continue; |
8f6d0378 RR |
1565 | sattr->address = sec->sh_addr; |
1566 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1567 | GFP_KERNEL); |
1568 | if (sattr->name == NULL) | |
1569 | goto out; | |
1570 | sect_attrs->nsections++; | |
361795b1 | 1571 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1572 | sattr->mattr.show = module_sect_show; |
1573 | sattr->mattr.store = NULL; | |
1574 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1575 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1576 | *(gattr++) = &(sattr++)->mattr.attr; |
1577 | } | |
1578 | *gattr = NULL; | |
1579 | ||
1580 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1581 | goto out; | |
1582 | ||
1583 | mod->sect_attrs = sect_attrs; | |
1584 | return; | |
1585 | out: | |
04b1db9f | 1586 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1587 | } |
1588 | ||
1589 | static void remove_sect_attrs(struct module *mod) | |
1590 | { | |
1591 | if (mod->sect_attrs) { | |
1592 | sysfs_remove_group(&mod->mkobj.kobj, | |
1593 | &mod->sect_attrs->grp); | |
1594 | /* We are positive that no one is using any sect attrs | |
1595 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1596 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1597 | mod->sect_attrs = NULL; |
1598 | } | |
1599 | } | |
1600 | ||
6d760133 RM |
1601 | /* |
1602 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1603 | */ | |
1604 | ||
1605 | struct module_notes_attrs { | |
1606 | struct kobject *dir; | |
1607 | unsigned int notes; | |
1608 | struct bin_attribute attrs[0]; | |
1609 | }; | |
1610 | ||
2c3c8bea | 1611 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1612 | struct bin_attribute *bin_attr, |
1613 | char *buf, loff_t pos, size_t count) | |
1614 | { | |
1615 | /* | |
1616 | * The caller checked the pos and count against our size. | |
1617 | */ | |
1618 | memcpy(buf, bin_attr->private + pos, count); | |
1619 | return count; | |
1620 | } | |
1621 | ||
1622 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1623 | unsigned int i) | |
1624 | { | |
1625 | if (notes_attrs->dir) { | |
1626 | while (i-- > 0) | |
1627 | sysfs_remove_bin_file(notes_attrs->dir, | |
1628 | ¬es_attrs->attrs[i]); | |
e9432093 | 1629 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1630 | } |
1631 | kfree(notes_attrs); | |
1632 | } | |
1633 | ||
8f6d0378 | 1634 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1635 | { |
1636 | unsigned int notes, loaded, i; | |
1637 | struct module_notes_attrs *notes_attrs; | |
1638 | struct bin_attribute *nattr; | |
1639 | ||
ea6bff36 IM |
1640 | /* failed to create section attributes, so can't create notes */ |
1641 | if (!mod->sect_attrs) | |
1642 | return; | |
1643 | ||
6d760133 RM |
1644 | /* Count notes sections and allocate structures. */ |
1645 | notes = 0; | |
8f6d0378 RR |
1646 | for (i = 0; i < info->hdr->e_shnum; i++) |
1647 | if (!sect_empty(&info->sechdrs[i]) && | |
1648 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1649 | ++notes; |
1650 | ||
1651 | if (notes == 0) | |
1652 | return; | |
1653 | ||
acafe7e3 | 1654 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1655 | GFP_KERNEL); |
1656 | if (notes_attrs == NULL) | |
1657 | return; | |
1658 | ||
1659 | notes_attrs->notes = notes; | |
1660 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1661 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1662 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1663 | continue; |
8f6d0378 | 1664 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1665 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1666 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1667 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1668 | nattr->size = info->sechdrs[i].sh_size; |
1669 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1670 | nattr->read = module_notes_read; |
1671 | ++nattr; | |
1672 | } | |
1673 | ++loaded; | |
1674 | } | |
1675 | ||
4ff6abff | 1676 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1677 | if (!notes_attrs->dir) |
1678 | goto out; | |
1679 | ||
1680 | for (i = 0; i < notes; ++i) | |
1681 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1682 | ¬es_attrs->attrs[i])) | |
1683 | goto out; | |
1684 | ||
1685 | mod->notes_attrs = notes_attrs; | |
1686 | return; | |
1687 | ||
1688 | out: | |
1689 | free_notes_attrs(notes_attrs, i); | |
1690 | } | |
1691 | ||
1692 | static void remove_notes_attrs(struct module *mod) | |
1693 | { | |
1694 | if (mod->notes_attrs) | |
1695 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1696 | } | |
1697 | ||
1da177e4 | 1698 | #else |
04b1db9f | 1699 | |
8f6d0378 RR |
1700 | static inline void add_sect_attrs(struct module *mod, |
1701 | const struct load_info *info) | |
1da177e4 LT |
1702 | { |
1703 | } | |
1704 | ||
1705 | static inline void remove_sect_attrs(struct module *mod) | |
1706 | { | |
1707 | } | |
6d760133 | 1708 | |
8f6d0378 RR |
1709 | static inline void add_notes_attrs(struct module *mod, |
1710 | const struct load_info *info) | |
6d760133 RM |
1711 | { |
1712 | } | |
1713 | ||
1714 | static inline void remove_notes_attrs(struct module *mod) | |
1715 | { | |
1716 | } | |
8f6d0378 | 1717 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1718 | |
1ba5c08b | 1719 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1720 | { |
1721 | #ifdef CONFIG_MODULE_UNLOAD | |
1722 | struct module_use *use; | |
80a3d1bb | 1723 | |
75676500 | 1724 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1725 | list_for_each_entry(use, &mod->target_list, target_list) |
1726 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1727 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1728 | #endif |
1729 | } | |
1730 | ||
1ba5c08b | 1731 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1732 | { |
1ba5c08b | 1733 | int ret = 0; |
80a3d1bb RR |
1734 | #ifdef CONFIG_MODULE_UNLOAD |
1735 | struct module_use *use; | |
1736 | ||
75676500 | 1737 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1738 | list_for_each_entry(use, &mod->target_list, target_list) { |
1739 | ret = sysfs_create_link(use->target->holders_dir, | |
1740 | &mod->mkobj.kobj, mod->name); | |
1741 | if (ret) | |
1742 | break; | |
1743 | } | |
75676500 | 1744 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1745 | if (ret) |
1746 | del_usage_links(mod); | |
80a3d1bb | 1747 | #endif |
1ba5c08b | 1748 | return ret; |
80a3d1bb RR |
1749 | } |
1750 | ||
bc6f2a75 Y |
1751 | static void module_remove_modinfo_attrs(struct module *mod, int end); |
1752 | ||
6407ebb2 | 1753 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1754 | { |
1755 | struct module_attribute *attr; | |
03e88ae1 | 1756 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1757 | int error = 0; |
1758 | int i; | |
1759 | ||
03e88ae1 GKH |
1760 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1761 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1762 | GFP_KERNEL); | |
1763 | if (!mod->modinfo_attrs) | |
1764 | return -ENOMEM; | |
1765 | ||
1766 | temp_attr = mod->modinfo_attrs; | |
bc6f2a75 | 1767 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
c75b590d | 1768 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1769 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1770 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1771 | error = sysfs_create_file(&mod->mkobj.kobj, |
1772 | &temp_attr->attr); | |
bc6f2a75 Y |
1773 | if (error) |
1774 | goto error_out; | |
03e88ae1 GKH |
1775 | ++temp_attr; |
1776 | } | |
c988d2b2 | 1777 | } |
bc6f2a75 Y |
1778 | |
1779 | return 0; | |
1780 | ||
1781 | error_out: | |
1782 | if (i > 0) | |
1783 | module_remove_modinfo_attrs(mod, --i); | |
c988d2b2 MD |
1784 | return error; |
1785 | } | |
1786 | ||
bc6f2a75 | 1787 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
c988d2b2 MD |
1788 | { |
1789 | struct module_attribute *attr; | |
1790 | int i; | |
1791 | ||
03e88ae1 | 1792 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
bc6f2a75 Y |
1793 | if (end >= 0 && i > end) |
1794 | break; | |
03e88ae1 GKH |
1795 | /* pick a field to test for end of list */ |
1796 | if (!attr->attr.name) | |
1797 | break; | |
6da0b565 | 1798 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1799 | if (attr->free) |
1800 | attr->free(mod); | |
c988d2b2 | 1801 | } |
03e88ae1 | 1802 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1803 | } |
1da177e4 | 1804 | |
942e4431 LZ |
1805 | static void mod_kobject_put(struct module *mod) |
1806 | { | |
1807 | DECLARE_COMPLETION_ONSTACK(c); | |
1808 | mod->mkobj.kobj_completion = &c; | |
1809 | kobject_put(&mod->mkobj.kobj); | |
1810 | wait_for_completion(&c); | |
1811 | } | |
1812 | ||
6407ebb2 | 1813 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1814 | { |
1815 | int err; | |
6494a93d | 1816 | struct kobject *kobj; |
1da177e4 | 1817 | |
823bccfc | 1818 | if (!module_sysfs_initialized) { |
bddb12b3 | 1819 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1820 | err = -EINVAL; |
1821 | goto out; | |
1822 | } | |
6494a93d GKH |
1823 | |
1824 | kobj = kset_find_obj(module_kset, mod->name); | |
1825 | if (kobj) { | |
bddb12b3 | 1826 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1827 | kobject_put(kobj); |
1828 | err = -EINVAL; | |
1829 | goto out; | |
1830 | } | |
1831 | ||
1da177e4 | 1832 | mod->mkobj.mod = mod; |
e17e0f51 | 1833 | |
ac3c8141 GKH |
1834 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1835 | mod->mkobj.kobj.kset = module_kset; | |
1836 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1837 | "%s", mod->name); | |
1838 | if (err) | |
942e4431 | 1839 | mod_kobject_put(mod); |
270a6c4c | 1840 | |
97c146ef | 1841 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1842 | out: |
1843 | return err; | |
1844 | } | |
1845 | ||
6407ebb2 | 1846 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1847 | const struct load_info *info, |
270a6c4c KS |
1848 | struct kernel_param *kparam, |
1849 | unsigned int num_params) | |
1850 | { | |
1851 | int err; | |
1852 | ||
80a3d1bb RR |
1853 | err = mod_sysfs_init(mod); |
1854 | if (err) | |
1855 | goto out; | |
1856 | ||
4ff6abff | 1857 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1858 | if (!mod->holders_dir) { |
1859 | err = -ENOMEM; | |
270a6c4c | 1860 | goto out_unreg; |
240936e1 | 1861 | } |
270a6c4c | 1862 | |
1da177e4 LT |
1863 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1864 | if (err) | |
270a6c4c | 1865 | goto out_unreg_holders; |
1da177e4 | 1866 | |
c988d2b2 MD |
1867 | err = module_add_modinfo_attrs(mod); |
1868 | if (err) | |
e17e0f51 | 1869 | goto out_unreg_param; |
c988d2b2 | 1870 | |
1ba5c08b CL |
1871 | err = add_usage_links(mod); |
1872 | if (err) | |
1873 | goto out_unreg_modinfo_attrs; | |
1874 | ||
8f6d0378 RR |
1875 | add_sect_attrs(mod, info); |
1876 | add_notes_attrs(mod, info); | |
80a3d1bb | 1877 | |
e17e0f51 | 1878 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1879 | return 0; |
1880 | ||
1ba5c08b | 1881 | out_unreg_modinfo_attrs: |
bc6f2a75 | 1882 | module_remove_modinfo_attrs(mod, -1); |
e17e0f51 KS |
1883 | out_unreg_param: |
1884 | module_param_sysfs_remove(mod); | |
270a6c4c | 1885 | out_unreg_holders: |
78a2d906 | 1886 | kobject_put(mod->holders_dir); |
270a6c4c | 1887 | out_unreg: |
942e4431 | 1888 | mod_kobject_put(mod); |
80a3d1bb | 1889 | out: |
1da177e4 LT |
1890 | return err; |
1891 | } | |
34e4e2fe DL |
1892 | |
1893 | static void mod_sysfs_fini(struct module *mod) | |
1894 | { | |
8f6d0378 RR |
1895 | remove_notes_attrs(mod); |
1896 | remove_sect_attrs(mod); | |
942e4431 | 1897 | mod_kobject_put(mod); |
34e4e2fe DL |
1898 | } |
1899 | ||
cf2fde7b RR |
1900 | static void init_param_lock(struct module *mod) |
1901 | { | |
1902 | mutex_init(&mod->param_lock); | |
1903 | } | |
8f6d0378 | 1904 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1905 | |
8f6d0378 RR |
1906 | static int mod_sysfs_setup(struct module *mod, |
1907 | const struct load_info *info, | |
6407ebb2 RR |
1908 | struct kernel_param *kparam, |
1909 | unsigned int num_params) | |
1910 | { | |
1911 | return 0; | |
1912 | } | |
1913 | ||
34e4e2fe DL |
1914 | static void mod_sysfs_fini(struct module *mod) |
1915 | { | |
1916 | } | |
1917 | ||
bc6f2a75 | 1918 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
36b0360d RR |
1919 | { |
1920 | } | |
1921 | ||
80a3d1bb RR |
1922 | static void del_usage_links(struct module *mod) |
1923 | { | |
1924 | } | |
1925 | ||
cf2fde7b RR |
1926 | static void init_param_lock(struct module *mod) |
1927 | { | |
1928 | } | |
34e4e2fe | 1929 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1930 | |
36b0360d | 1931 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1932 | { |
80a3d1bb | 1933 | del_usage_links(mod); |
bc6f2a75 | 1934 | module_remove_modinfo_attrs(mod, -1); |
1da177e4 | 1935 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1936 | kobject_put(mod->mkobj.drivers_dir); |
1937 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1938 | mod_sysfs_fini(mod); |
1da177e4 LT |
1939 | } |
1940 | ||
93651f80 | 1941 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb MC |
1942 | /* |
1943 | * LKM RO/NX protection: protect module's text/ro-data | |
1944 | * from modification and any data from execution. | |
85c898db RR |
1945 | * |
1946 | * General layout of module is: | |
444d13ff JY |
1947 | * [text] [read-only-data] [ro-after-init] [writable data] |
1948 | * text_size -----^ ^ ^ ^ | |
1949 | * ro_size ------------------------| | | | |
1950 | * ro_after_init_size -----------------------------| | | |
1951 | * size -----------------------------------------------------------| | |
85c898db RR |
1952 | * |
1953 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1954 | */ |
85c898db RR |
1955 | static void frob_text(const struct module_layout *layout, |
1956 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1957 | { |
85c898db RR |
1958 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1959 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1960 | set_memory((unsigned long)layout->base, | |
1961 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1962 | } |
84e1c6bb | 1963 | |
93651f80 | 1964 | #ifdef CONFIG_STRICT_MODULE_RWX |
85c898db RR |
1965 | static void frob_rodata(const struct module_layout *layout, |
1966 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1967 | { |
85c898db RR |
1968 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1969 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1970 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1971 | set_memory((unsigned long)layout->base + layout->text_size, | |
1972 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1973 | } |
1974 | ||
444d13ff JY |
1975 | static void frob_ro_after_init(const struct module_layout *layout, |
1976 | int (*set_memory)(unsigned long start, int num_pages)) | |
1977 | { | |
1978 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1979 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1980 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1981 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1982 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1983 | } | |
1984 | ||
85c898db RR |
1985 | static void frob_writable_data(const struct module_layout *layout, |
1986 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1987 | { |
85c898db | 1988 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1989 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1990 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1991 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1992 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1993 | } |
84e1c6bb | 1994 | |
85c898db RR |
1995 | /* livepatching wants to disable read-only so it can frob module. */ |
1996 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1997 | { |
39290b38 AT |
1998 | if (!rodata_enabled) |
1999 | return; | |
2000 | ||
85c898db RR |
2001 | frob_text(&mod->core_layout, set_memory_rw); |
2002 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 2003 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
2004 | frob_text(&mod->init_layout, set_memory_rw); |
2005 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 2006 | } |
84e1c6bb | 2007 | |
444d13ff | 2008 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 2009 | { |
39290b38 AT |
2010 | if (!rodata_enabled) |
2011 | return; | |
2012 | ||
1a7b7d92 RE |
2013 | set_vm_flush_reset_perms(mod->core_layout.base); |
2014 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 2015 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 2016 | |
85c898db RR |
2017 | frob_rodata(&mod->core_layout, set_memory_ro); |
2018 | frob_text(&mod->init_layout, set_memory_ro); | |
2019 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
2020 | |
2021 | if (after_init) | |
2022 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
2023 | } |
2024 | ||
85c898db | 2025 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 2026 | { |
85c898db | 2027 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 2028 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
2029 | frob_writable_data(&mod->core_layout, set_memory_nx); |
2030 | frob_rodata(&mod->init_layout, set_memory_nx); | |
2031 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
2032 | } |
2033 | ||
84e1c6bb | 2034 | /* Iterate through all modules and set each module's text as RW */ |
5d05c708 | 2035 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
2036 | { |
2037 | struct module *mod; | |
2038 | ||
39290b38 AT |
2039 | if (!rodata_enabled) |
2040 | return; | |
2041 | ||
84e1c6bb MC |
2042 | mutex_lock(&module_mutex); |
2043 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
2044 | if (mod->state == MODULE_STATE_UNFORMED) |
2045 | continue; | |
85c898db RR |
2046 | |
2047 | frob_text(&mod->core_layout, set_memory_rw); | |
2048 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb MC |
2049 | } |
2050 | mutex_unlock(&module_mutex); | |
2051 | } | |
2052 | ||
2053 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 2054 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
2055 | { |
2056 | struct module *mod; | |
2057 | ||
39290b38 AT |
2058 | if (!rodata_enabled) |
2059 | return; | |
2060 | ||
84e1c6bb MC |
2061 | mutex_lock(&module_mutex); |
2062 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
2063 | /* |
2064 | * Ignore going modules since it's possible that ro | |
2065 | * protection has already been disabled, otherwise we'll | |
2066 | * run into protection faults at module deallocation. | |
2067 | */ | |
2068 | if (mod->state == MODULE_STATE_UNFORMED || | |
2069 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 2070 | continue; |
85c898db RR |
2071 | |
2072 | frob_text(&mod->core_layout, set_memory_ro); | |
2073 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb MC |
2074 | } |
2075 | mutex_unlock(&module_mutex); | |
2076 | } | |
93651f80 | 2077 | #else /* !CONFIG_STRICT_MODULE_RWX */ |
85c898db | 2078 | static void module_enable_nx(const struct module *mod) { } |
93651f80 | 2079 | #endif /* CONFIG_STRICT_MODULE_RWX */ |
2eef1399 YY |
2080 | static void module_enable_x(const struct module *mod) |
2081 | { | |
2082 | frob_text(&mod->core_layout, set_memory_x); | |
2083 | frob_text(&mod->init_layout, set_memory_x); | |
2084 | } | |
93651f80 YY |
2085 | #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ |
2086 | static void module_enable_nx(const struct module *mod) { } | |
2087 | static void module_enable_x(const struct module *mod) { } | |
2088 | #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
2089 | ||
84e1c6bb | 2090 | |
1ce15ef4 JY |
2091 | #ifdef CONFIG_LIVEPATCH |
2092 | /* | |
2093 | * Persist Elf information about a module. Copy the Elf header, | |
2094 | * section header table, section string table, and symtab section | |
2095 | * index from info to mod->klp_info. | |
2096 | */ | |
2097 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2098 | { | |
2099 | unsigned int size, symndx; | |
2100 | int ret; | |
2101 | ||
2102 | size = sizeof(*mod->klp_info); | |
2103 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2104 | if (mod->klp_info == NULL) | |
2105 | return -ENOMEM; | |
2106 | ||
2107 | /* Elf header */ | |
2108 | size = sizeof(mod->klp_info->hdr); | |
2109 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2110 | ||
2111 | /* Elf section header table */ | |
2112 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2113 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2114 | if (mod->klp_info->sechdrs == NULL) { |
2115 | ret = -ENOMEM; | |
2116 | goto free_info; | |
2117 | } | |
1ce15ef4 JY |
2118 | |
2119 | /* Elf section name string table */ | |
2120 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2121 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2122 | if (mod->klp_info->secstrings == NULL) { |
2123 | ret = -ENOMEM; | |
2124 | goto free_sechdrs; | |
2125 | } | |
1ce15ef4 JY |
2126 | |
2127 | /* Elf symbol section index */ | |
2128 | symndx = info->index.sym; | |
2129 | mod->klp_info->symndx = symndx; | |
2130 | ||
2131 | /* | |
2132 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2133 | * copy of the original symbol table. Adjust sh_addr to point | |
2134 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2135 | * init memory is freed at the end of do_init_module(). | |
2136 | */ | |
2137 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2138 | (unsigned long) mod->core_kallsyms.symtab; | |
2139 | ||
2140 | return 0; | |
2141 | ||
2142 | free_sechdrs: | |
2143 | kfree(mod->klp_info->sechdrs); | |
2144 | free_info: | |
2145 | kfree(mod->klp_info); | |
2146 | return ret; | |
2147 | } | |
2148 | ||
2149 | static void free_module_elf(struct module *mod) | |
2150 | { | |
2151 | kfree(mod->klp_info->sechdrs); | |
2152 | kfree(mod->klp_info->secstrings); | |
2153 | kfree(mod->klp_info); | |
2154 | } | |
2155 | #else /* !CONFIG_LIVEPATCH */ | |
2156 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2157 | { | |
2158 | return 0; | |
2159 | } | |
2160 | ||
2161 | static void free_module_elf(struct module *mod) | |
2162 | { | |
2163 | } | |
2164 | #endif /* CONFIG_LIVEPATCH */ | |
2165 | ||
be1f221c | 2166 | void __weak module_memfree(void *module_region) |
74e08fcf | 2167 | { |
1a7b7d92 RE |
2168 | /* |
2169 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2170 | * supported by vmalloc. | |
2171 | */ | |
2172 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2173 | vfree(module_region); |
2174 | } | |
2175 | ||
2176 | void __weak module_arch_cleanup(struct module *mod) | |
2177 | { | |
2178 | } | |
2179 | ||
d453cded RR |
2180 | void __weak module_arch_freeing_init(struct module *mod) |
2181 | { | |
2182 | } | |
2183 | ||
75676500 | 2184 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2185 | static void free_module(struct module *mod) |
2186 | { | |
7ead8b83 LZ |
2187 | trace_module_free(mod); |
2188 | ||
36b0360d | 2189 | mod_sysfs_teardown(mod); |
1da177e4 | 2190 | |
944a1fa0 RR |
2191 | /* We leave it in list to prevent duplicate loads, but make sure |
2192 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2193 | mutex_lock(&module_mutex); |
944a1fa0 | 2194 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2195 | mutex_unlock(&module_mutex); |
944a1fa0 | 2196 | |
b82bab4b JB |
2197 | /* Remove dynamic debug info */ |
2198 | ddebug_remove_module(mod->name); | |
2199 | ||
1da177e4 LT |
2200 | /* Arch-specific cleanup. */ |
2201 | module_arch_cleanup(mod); | |
2202 | ||
2203 | /* Module unload stuff */ | |
2204 | module_unload_free(mod); | |
2205 | ||
e180a6b7 RR |
2206 | /* Free any allocated parameters. */ |
2207 | destroy_params(mod->kp, mod->num_kp); | |
2208 | ||
1ce15ef4 JY |
2209 | if (is_livepatch_module(mod)) |
2210 | free_module_elf(mod); | |
2211 | ||
944a1fa0 RR |
2212 | /* Now we can delete it from the lists */ |
2213 | mutex_lock(&module_mutex); | |
461e34ae MH |
2214 | /* Unlink carefully: kallsyms could be walking list. */ |
2215 | list_del_rcu(&mod->list); | |
93c2e105 | 2216 | mod_tree_remove(mod); |
0286b5ea | 2217 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2218 | module_bug_cleanup(mod); |
0be964be | 2219 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2220 | synchronize_rcu(); |
944a1fa0 RR |
2221 | mutex_unlock(&module_mutex); |
2222 | ||
85c898db | 2223 | /* This may be empty, but that's OK */ |
d453cded | 2224 | module_arch_freeing_init(mod); |
7523e4dc | 2225 | module_memfree(mod->init_layout.base); |
1da177e4 | 2226 | kfree(mod->args); |
259354de | 2227 | percpu_modfree(mod); |
9f85a4bb | 2228 | |
35a9393c | 2229 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2230 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2231 | |
1da177e4 | 2232 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2233 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2234 | } |
2235 | ||
2236 | void *__symbol_get(const char *symbol) | |
2237 | { | |
2238 | struct module *owner; | |
414fd31b | 2239 | const struct kernel_symbol *sym; |
1da177e4 | 2240 | |
24da1cbf | 2241 | preempt_disable(); |
414fd31b TA |
2242 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2243 | if (sym && strong_try_module_get(owner)) | |
2244 | sym = NULL; | |
24da1cbf | 2245 | preempt_enable(); |
1da177e4 | 2246 | |
7290d580 | 2247 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2248 | } |
2249 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2250 | ||
eea8b54d AN |
2251 | /* |
2252 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2253 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2254 | * |
2255 | * You must hold the module_mutex. | |
eea8b54d | 2256 | */ |
2d25bc55 | 2257 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2258 | { |
b211104d | 2259 | unsigned int i; |
eea8b54d | 2260 | struct module *owner; |
b211104d RR |
2261 | const struct kernel_symbol *s; |
2262 | struct { | |
2263 | const struct kernel_symbol *sym; | |
2264 | unsigned int num; | |
2265 | } arr[] = { | |
2266 | { mod->syms, mod->num_syms }, | |
2267 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2268 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2269 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2270 | { mod->unused_syms, mod->num_unused_syms }, |
2271 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2272 | #endif |
b211104d | 2273 | }; |
eea8b54d | 2274 | |
b211104d RR |
2275 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2276 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 AB |
2277 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
2278 | true, false)) { | |
bddb12b3 | 2279 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2280 | " (owned by %s)\n", |
7290d580 AB |
2281 | mod->name, kernel_symbol_name(s), |
2282 | module_name(owner)); | |
b211104d RR |
2283 | return -ENOEXEC; |
2284 | } | |
eea8b54d | 2285 | } |
b211104d RR |
2286 | } |
2287 | return 0; | |
eea8b54d AN |
2288 | } |
2289 | ||
9a4b9708 | 2290 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2291 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2292 | { | |
2293 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2294 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2295 | unsigned long secbase; |
49668688 | 2296 | unsigned int i; |
1da177e4 | 2297 | int ret = 0; |
414fd31b | 2298 | const struct kernel_symbol *ksym; |
1da177e4 | 2299 | |
49668688 RR |
2300 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2301 | const char *name = info->strtab + sym[i].st_name; | |
2302 | ||
1da177e4 LT |
2303 | switch (sym[i].st_shndx) { |
2304 | case SHN_COMMON: | |
80375980 JM |
2305 | /* Ignore common symbols */ |
2306 | if (!strncmp(name, "__gnu_lto", 9)) | |
2307 | break; | |
2308 | ||
1da177e4 LT |
2309 | /* We compiled with -fno-common. These are not |
2310 | supposed to happen. */ | |
5e124169 | 2311 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2312 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2313 | mod->name); |
2314 | ret = -ENOEXEC; | |
2315 | break; | |
2316 | ||
2317 | case SHN_ABS: | |
2318 | /* Don't need to do anything */ | |
5e124169 | 2319 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2320 | (long)sym[i].st_value); |
2321 | break; | |
2322 | ||
1ce15ef4 JY |
2323 | case SHN_LIVEPATCH: |
2324 | /* Livepatch symbols are resolved by livepatch */ | |
2325 | break; | |
2326 | ||
1da177e4 | 2327 | case SHN_UNDEF: |
49668688 | 2328 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2329 | /* Ok if resolved. */ |
9bea7f23 | 2330 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2331 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2332 | break; |
414fd31b TA |
2333 | } |
2334 | ||
1da177e4 | 2335 | /* Ok if weak. */ |
9bea7f23 | 2336 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2337 | break; |
2338 | ||
9bea7f23 | 2339 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2340 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2341 | mod->name, name, ret); | |
1da177e4 LT |
2342 | break; |
2343 | ||
2344 | default: | |
2345 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2346 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2347 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2348 | else |
49668688 | 2349 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2350 | sym[i].st_value += secbase; |
2351 | break; | |
2352 | } | |
2353 | } | |
2354 | ||
2355 | return ret; | |
2356 | } | |
2357 | ||
49668688 | 2358 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2359 | { |
2360 | unsigned int i; | |
2361 | int err = 0; | |
2362 | ||
2363 | /* Now do relocations. */ | |
49668688 RR |
2364 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2365 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2366 | |
2367 | /* Not a valid relocation section? */ | |
49668688 | 2368 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2369 | continue; |
2370 | ||
2371 | /* Don't bother with non-allocated sections */ | |
49668688 | 2372 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2373 | continue; |
2374 | ||
1ce15ef4 JY |
2375 | /* Livepatch relocation sections are applied by livepatch */ |
2376 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2377 | continue; | |
2378 | ||
49668688 RR |
2379 | if (info->sechdrs[i].sh_type == SHT_REL) |
2380 | err = apply_relocate(info->sechdrs, info->strtab, | |
2381 | info->index.sym, i, mod); | |
2382 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2383 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2384 | info->index.sym, i, mod); | |
22e268eb RR |
2385 | if (err < 0) |
2386 | break; | |
2387 | } | |
2388 | return err; | |
2389 | } | |
2390 | ||
088af9a6 HD |
2391 | /* Additional bytes needed by arch in front of individual sections */ |
2392 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2393 | unsigned int section) | |
2394 | { | |
2395 | /* default implementation just returns zero */ | |
2396 | return 0; | |
2397 | } | |
2398 | ||
1da177e4 | 2399 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2400 | static long get_offset(struct module *mod, unsigned int *size, |
2401 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2402 | { |
2403 | long ret; | |
2404 | ||
088af9a6 | 2405 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2406 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2407 | *size = ret + sechdr->sh_size; | |
2408 | return ret; | |
2409 | } | |
2410 | ||
2411 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2412 | might -- code, read-only data, read-write data, small data. Tally | |
2413 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2414 | belongs in init. */ | |
49668688 | 2415 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2416 | { |
2417 | static unsigned long const masks[][2] = { | |
2418 | /* NOTE: all executable code must be the first section | |
2419 | * in this array; otherwise modify the text_size | |
2420 | * finder in the two loops below */ | |
2421 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2422 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2423 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2424 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2425 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2426 | }; | |
2427 | unsigned int m, i; | |
2428 | ||
49668688 RR |
2429 | for (i = 0; i < info->hdr->e_shnum; i++) |
2430 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2431 | |
5e124169 | 2432 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2433 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2434 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2435 | Elf_Shdr *s = &info->sechdrs[i]; | |
2436 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2437 | |
2438 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2439 | || (s->sh_flags & masks[m][1]) | |
2440 | || s->sh_entsize != ~0UL | |
49668688 | 2441 | || strstarts(sname, ".init")) |
1da177e4 | 2442 | continue; |
7523e4dc | 2443 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2444 | pr_debug("\t%s\n", sname); |
1da177e4 | 2445 | } |
84e1c6bb MC |
2446 | switch (m) { |
2447 | case 0: /* executable */ | |
7523e4dc RR |
2448 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2449 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2450 | break; |
2451 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2452 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2453 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2454 | break; |
444d13ff JY |
2455 | case 2: /* RO after init */ |
2456 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2457 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2458 | break; | |
2459 | case 4: /* whole core */ | |
7523e4dc | 2460 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2461 | break; |
2462 | } | |
1da177e4 LT |
2463 | } |
2464 | ||
5e124169 | 2465 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2466 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2467 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2468 | Elf_Shdr *s = &info->sechdrs[i]; | |
2469 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2470 | |
2471 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2472 | || (s->sh_flags & masks[m][1]) | |
2473 | || s->sh_entsize != ~0UL | |
49668688 | 2474 | || !strstarts(sname, ".init")) |
1da177e4 | 2475 | continue; |
7523e4dc | 2476 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2477 | | INIT_OFFSET_MASK); |
5e124169 | 2478 | pr_debug("\t%s\n", sname); |
1da177e4 | 2479 | } |
84e1c6bb MC |
2480 | switch (m) { |
2481 | case 0: /* executable */ | |
7523e4dc RR |
2482 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2483 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2484 | break; |
2485 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2486 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2487 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2488 | break; |
444d13ff JY |
2489 | case 2: |
2490 | /* | |
2491 | * RO after init doesn't apply to init_layout (only | |
2492 | * core_layout), so it just takes the value of ro_size. | |
2493 | */ | |
2494 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2495 | break; | |
2496 | case 4: /* whole init */ | |
7523e4dc | 2497 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2498 | break; |
2499 | } | |
1da177e4 LT |
2500 | } |
2501 | } | |
2502 | ||
1da177e4 LT |
2503 | static void set_license(struct module *mod, const char *license) |
2504 | { | |
2505 | if (!license) | |
2506 | license = "unspecified"; | |
2507 | ||
fa3ba2e8 | 2508 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2509 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2510 | pr_warn("%s: module license '%s' taints kernel.\n", |
2511 | mod->name, license); | |
373d4d09 RR |
2512 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2513 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2514 | } |
2515 | } | |
2516 | ||
2517 | /* Parse tag=value strings from .modinfo section */ | |
2518 | static char *next_string(char *string, unsigned long *secsize) | |
2519 | { | |
2520 | /* Skip non-zero chars */ | |
2521 | while (string[0]) { | |
2522 | string++; | |
2523 | if ((*secsize)-- <= 1) | |
2524 | return NULL; | |
2525 | } | |
2526 | ||
2527 | /* Skip any zero padding. */ | |
2528 | while (!string[0]) { | |
2529 | string++; | |
2530 | if ((*secsize)-- <= 1) | |
2531 | return NULL; | |
2532 | } | |
2533 | return string; | |
2534 | } | |
2535 | ||
c5e4a062 MM |
2536 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
2537 | char *prev) | |
1da177e4 LT |
2538 | { |
2539 | char *p; | |
2540 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2541 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2542 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2543 | |
5fdc7db6 JY |
2544 | /* |
2545 | * get_modinfo() calls made before rewrite_section_headers() | |
2546 | * must use sh_offset, as sh_addr isn't set! | |
2547 | */ | |
c5e4a062 MM |
2548 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
2549 | ||
2550 | if (prev) { | |
2551 | size -= prev - modinfo; | |
2552 | modinfo = next_string(prev, &size); | |
2553 | } | |
2554 | ||
2555 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2556 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2557 | return p + taglen + 1; | |
2558 | } | |
2559 | return NULL; | |
2560 | } | |
2561 | ||
c5e4a062 MM |
2562 | static char *get_modinfo(const struct load_info *info, const char *tag) |
2563 | { | |
2564 | return get_next_modinfo(info, tag, NULL); | |
2565 | } | |
2566 | ||
49668688 | 2567 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2568 | { |
2569 | struct module_attribute *attr; | |
2570 | int i; | |
2571 | ||
2572 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2573 | if (attr->setup) | |
49668688 | 2574 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2575 | } |
2576 | } | |
c988d2b2 | 2577 | |
a263f776 RR |
2578 | static void free_modinfo(struct module *mod) |
2579 | { | |
2580 | struct module_attribute *attr; | |
2581 | int i; | |
2582 | ||
2583 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2584 | if (attr->free) | |
2585 | attr->free(mod); | |
2586 | } | |
2587 | } | |
2588 | ||
1da177e4 | 2589 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2590 | |
2d25bc55 JY |
2591 | /* Lookup exported symbol in given range of kernel_symbols */ |
2592 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2593 | const struct kernel_symbol *start, | |
2594 | const struct kernel_symbol *stop) | |
15bba37d | 2595 | { |
9d63487f AIB |
2596 | return bsearch(name, start, stop - start, |
2597 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2598 | } |
2599 | ||
ca4787b7 TA |
2600 | static int is_exported(const char *name, unsigned long value, |
2601 | const struct module *mod) | |
1da177e4 | 2602 | { |
ca4787b7 TA |
2603 | const struct kernel_symbol *ks; |
2604 | if (!mod) | |
2d25bc55 | 2605 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2606 | else |
2d25bc55 JY |
2607 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2608 | ||
7290d580 | 2609 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2610 | } |
2611 | ||
2612 | /* As per nm */ | |
eded41c1 | 2613 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2614 | { |
eded41c1 RR |
2615 | const Elf_Shdr *sechdrs = info->sechdrs; |
2616 | ||
1da177e4 LT |
2617 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2618 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2619 | return 'v'; | |
2620 | else | |
2621 | return 'w'; | |
2622 | } | |
2623 | if (sym->st_shndx == SHN_UNDEF) | |
2624 | return 'U'; | |
e0224418 | 2625 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2626 | return 'a'; |
2627 | if (sym->st_shndx >= SHN_LORESERVE) | |
2628 | return '?'; | |
2629 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2630 | return 't'; | |
2631 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2632 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2633 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2634 | return 'r'; | |
2635 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2636 | return 'g'; | |
2637 | else | |
2638 | return 'd'; | |
2639 | } | |
2640 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2641 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2642 | return 's'; | |
2643 | else | |
2644 | return 'b'; | |
2645 | } | |
eded41c1 RR |
2646 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2647 | ".debug")) { | |
1da177e4 | 2648 | return 'n'; |
eded41c1 | 2649 | } |
1da177e4 LT |
2650 | return '?'; |
2651 | } | |
2652 | ||
4a496226 | 2653 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2654 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2655 | { |
2656 | const Elf_Shdr *sec; | |
2657 | ||
2658 | if (src->st_shndx == SHN_UNDEF | |
2659 | || src->st_shndx >= shnum | |
2660 | || !src->st_name) | |
2661 | return false; | |
2662 | ||
e0224418 MB |
2663 | #ifdef CONFIG_KALLSYMS_ALL |
2664 | if (src->st_shndx == pcpundx) | |
2665 | return true; | |
2666 | #endif | |
2667 | ||
4a496226 JB |
2668 | sec = sechdrs + src->st_shndx; |
2669 | if (!(sec->sh_flags & SHF_ALLOC) | |
2670 | #ifndef CONFIG_KALLSYMS_ALL | |
2671 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2672 | #endif | |
2673 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2674 | return false; | |
2675 | ||
2676 | return true; | |
2677 | } | |
2678 | ||
48fd1188 KC |
2679 | /* |
2680 | * We only allocate and copy the strings needed by the parts of symtab | |
2681 | * we keep. This is simple, but has the effect of making multiple | |
2682 | * copies of duplicates. We could be more sophisticated, see | |
2683 | * linux-kernel thread starting with | |
2684 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2685 | */ | |
49668688 | 2686 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2687 | { |
49668688 RR |
2688 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2689 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2690 | const Elf_Sym *src; |
54523ec7 | 2691 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2692 | |
2693 | /* Put symbol section at end of init part of module. */ | |
2694 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2695 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2696 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2697 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2698 | |
49668688 | 2699 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2700 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2701 | |
48fd1188 | 2702 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2703 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2704 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2705 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2706 | info->index.pcpu)) { | |
59ef28b1 | 2707 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2708 | ndst++; |
554bdfe5 | 2709 | } |
59ef28b1 | 2710 | } |
4a496226 JB |
2711 | |
2712 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2713 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2714 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2715 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2716 | info->core_typeoffs = mod->core_layout.size; |
2717 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2718 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2719 | |
554bdfe5 JB |
2720 | /* Put string table section at end of init part of module. */ |
2721 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2722 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2723 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2724 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2725 | |
2726 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2727 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2728 | __alignof__(struct mod_kallsyms)); | |
2729 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2730 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2731 | info->init_typeoffs = mod->init_layout.size; |
2732 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2733 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2734 | } |
2735 | ||
8244062e RR |
2736 | /* |
2737 | * We use the full symtab and strtab which layout_symtab arranged to | |
2738 | * be appended to the init section. Later we switch to the cut-down | |
2739 | * core-only ones. | |
2740 | */ | |
811d66a0 | 2741 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2742 | { |
4a496226 JB |
2743 | unsigned int i, ndst; |
2744 | const Elf_Sym *src; | |
2745 | Elf_Sym *dst; | |
554bdfe5 | 2746 | char *s; |
eded41c1 | 2747 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2748 | |
8244062e RR |
2749 | /* Set up to point into init section. */ |
2750 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2751 | ||
2752 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2753 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2754 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2755 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2756 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2757 | |
1c7651f4 EL |
2758 | /* |
2759 | * Now populate the cut down core kallsyms for after init | |
2760 | * and set types up while we still have access to sections. | |
2761 | */ | |
8244062e RR |
2762 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2763 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2764 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2765 | src = mod->kallsyms->symtab; |
2766 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2767 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2768 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2769 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2770 | info->index.pcpu)) { | |
1c7651f4 EL |
2771 | mod->core_kallsyms.typetab[ndst] = |
2772 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2773 | dst[ndst] = src[i]; |
8244062e RR |
2774 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2775 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2776 | KSYM_NAME_LEN) + 1; |
2777 | } | |
4a496226 | 2778 | } |
8244062e | 2779 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2780 | } |
2781 | #else | |
49668688 | 2782 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2783 | { |
2784 | } | |
3ae91c21 | 2785 | |
abbce906 | 2786 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2787 | { |
2788 | } | |
2789 | #endif /* CONFIG_KALLSYMS */ | |
2790 | ||
52796312 | 2791 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2792 | { |
811d66a0 RR |
2793 | if (!debug) |
2794 | return; | |
513770f5 | 2795 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2796 | } |
346e15be | 2797 | |
52796312 | 2798 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2799 | { |
2800 | if (debug) | |
52796312 | 2801 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2802 | } |
2803 | ||
74e08fcf JB |
2804 | void * __weak module_alloc(unsigned long size) |
2805 | { | |
82fab442 | 2806 | return vmalloc_exec(size); |
74e08fcf JB |
2807 | } |
2808 | ||
38b37d63 MS |
2809 | bool __weak module_exit_section(const char *name) |
2810 | { | |
2811 | return strstarts(name, ".exit"); | |
2812 | } | |
2813 | ||
4f2294b6 | 2814 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2815 | static void kmemleak_load_module(const struct module *mod, |
2816 | const struct load_info *info) | |
4f2294b6 CM |
2817 | { |
2818 | unsigned int i; | |
2819 | ||
2820 | /* only scan the sections containing data */ | |
c017b4be | 2821 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2822 | |
49668688 | 2823 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2824 | /* Scan all writable sections that's not executable */ |
2825 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2826 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2827 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2828 | continue; |
2829 | ||
49668688 RR |
2830 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2831 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2832 | } |
2833 | } | |
2834 | #else | |
49668688 RR |
2835 | static inline void kmemleak_load_module(const struct module *mod, |
2836 | const struct load_info *info) | |
4f2294b6 CM |
2837 | { |
2838 | } | |
2839 | #endif | |
2840 | ||
106a4ee2 | 2841 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2842 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 | 2843 | { |
49fcf732 | 2844 | int err = -ENODATA; |
34e1169d | 2845 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
49fcf732 | 2846 | const char *reason; |
34e1169d | 2847 | const void *mod = info->hdr; |
caabe240 | 2848 | |
bca014ca BH |
2849 | /* |
2850 | * Require flags == 0, as a module with version information | |
2851 | * removed is no longer the module that was signed | |
2852 | */ | |
2853 | if (flags == 0 && | |
2854 | info->len > markerlen && | |
34e1169d | 2855 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2856 | /* We truncate the module to discard the signature */ |
34e1169d | 2857 | info->len -= markerlen; |
f314dfea | 2858 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2859 | } |
2860 | ||
49fcf732 DH |
2861 | switch (err) { |
2862 | case 0: | |
106a4ee2 RR |
2863 | info->sig_ok = true; |
2864 | return 0; | |
106a4ee2 | 2865 | |
49fcf732 DH |
2866 | /* We don't permit modules to be loaded into trusted kernels |
2867 | * without a valid signature on them, but if we're not | |
2868 | * enforcing, certain errors are non-fatal. | |
2869 | */ | |
2870 | case -ENODATA: | |
2871 | reason = "Loading of unsigned module"; | |
2872 | goto decide; | |
2873 | case -ENOPKG: | |
2874 | reason = "Loading of module with unsupported crypto"; | |
2875 | goto decide; | |
2876 | case -ENOKEY: | |
2877 | reason = "Loading of module with unavailable key"; | |
2878 | decide: | |
2879 | if (is_module_sig_enforced()) { | |
2880 | pr_notice("%s is rejected\n", reason); | |
2881 | return -EKEYREJECTED; | |
2882 | } | |
106a4ee2 | 2883 | |
49fcf732 DH |
2884 | return security_locked_down(LOCKDOWN_MODULE_SIGNATURE); |
2885 | ||
2886 | /* All other errors are fatal, including nomem, unparseable | |
2887 | * signatures and signature check failures - even if signatures | |
2888 | * aren't required. | |
2889 | */ | |
2890 | default: | |
2891 | return err; | |
2892 | } | |
106a4ee2 RR |
2893 | } |
2894 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2895 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2896 | { |
2897 | return 0; | |
2898 | } | |
2899 | #endif /* !CONFIG_MODULE_SIG */ | |
2900 | ||
34e1169d KC |
2901 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2902 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2903 | { |
34e1169d KC |
2904 | if (info->len < sizeof(*(info->hdr))) |
2905 | return -ENOEXEC; | |
2906 | ||
2907 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2908 | || info->hdr->e_type != ET_REL | |
2909 | || !elf_check_arch(info->hdr) | |
2910 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2911 | return -ENOEXEC; | |
2912 | ||
2913 | if (info->hdr->e_shoff >= info->len | |
2914 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2915 | info->len - info->hdr->e_shoff)) | |
2916 | return -ENOEXEC; | |
40dd2560 | 2917 | |
34e1169d KC |
2918 | return 0; |
2919 | } | |
2920 | ||
3afe9f84 LT |
2921 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2922 | ||
2923 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2924 | { | |
2925 | do { | |
2926 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2927 | ||
2928 | if (copy_from_user(dst, usrc, n) != 0) | |
2929 | return -EFAULT; | |
2930 | cond_resched(); | |
2931 | dst += n; | |
2932 | usrc += n; | |
2933 | len -= n; | |
2934 | } while (len); | |
2935 | return 0; | |
2936 | } | |
2937 | ||
1ce15ef4 | 2938 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2939 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2940 | { |
2992ef29 JP |
2941 | if (get_modinfo(info, "livepatch")) { |
2942 | mod->klp = true; | |
2943 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2944 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2945 | mod->name); | |
2992ef29 | 2946 | } |
1ce15ef4 JY |
2947 | |
2948 | return 0; | |
2949 | } | |
2950 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2951 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2952 | { |
2953 | if (get_modinfo(info, "livepatch")) { | |
2954 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2955 | mod->name); | |
2956 | return -ENOEXEC; | |
2957 | } | |
2958 | ||
2959 | return 0; | |
2960 | } | |
2961 | #endif /* CONFIG_LIVEPATCH */ | |
2962 | ||
caf7501a AK |
2963 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2964 | { | |
2965 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2966 | return; | |
2967 | ||
2968 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2969 | mod->name); | |
2970 | } | |
2971 | ||
34e1169d KC |
2972 | /* Sets info->hdr and info->len. */ |
2973 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2974 | struct load_info *info) | |
40dd2560 RR |
2975 | { |
2976 | int err; | |
40dd2560 | 2977 | |
34e1169d KC |
2978 | info->len = len; |
2979 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2980 | return -ENOEXEC; |
2981 | ||
c77b8cdf | 2982 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2983 | if (err) |
2984 | return err; | |
2985 | ||
40dd2560 | 2986 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2987 | info->hdr = __vmalloc(info->len, |
19809c2d | 2988 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2989 | if (!info->hdr) |
40dd2560 RR |
2990 | return -ENOMEM; |
2991 | ||
3afe9f84 | 2992 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2993 | vfree(info->hdr); |
2994 | return -EFAULT; | |
40dd2560 RR |
2995 | } |
2996 | ||
34e1169d KC |
2997 | return 0; |
2998 | } | |
2999 | ||
d913188c RR |
3000 | static void free_copy(struct load_info *info) |
3001 | { | |
d913188c RR |
3002 | vfree(info->hdr); |
3003 | } | |
3004 | ||
2f3238ae | 3005 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
3006 | { |
3007 | unsigned int i; | |
3008 | ||
3009 | /* This should always be true, but let's be sure. */ | |
3010 | info->sechdrs[0].sh_addr = 0; | |
3011 | ||
3012 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3013 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
3014 | if (shdr->sh_type != SHT_NOBITS | |
3015 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 3016 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
3017 | return -ENOEXEC; |
3018 | } | |
3019 | ||
3020 | /* Mark all sections sh_addr with their address in the | |
3021 | temporary image. */ | |
3022 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
3023 | ||
3024 | #ifndef CONFIG_MODULE_UNLOAD | |
3025 | /* Don't load .exit sections */ | |
38b37d63 | 3026 | if (module_exit_section(info->secstrings+shdr->sh_name)) |
8b5f61a7 RR |
3027 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; |
3028 | #endif | |
8b5f61a7 | 3029 | } |
d6df72a0 RR |
3030 | |
3031 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 3032 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 3033 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 3034 | |
8b5f61a7 RR |
3035 | return 0; |
3036 | } | |
3037 | ||
3264d3f9 LT |
3038 | /* |
3039 | * Set up our basic convenience variables (pointers to section headers, | |
3040 | * search for module section index etc), and do some basic section | |
3041 | * verification. | |
3042 | * | |
81a0abd9 JY |
3043 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
3044 | * will be allocated in move_module(). | |
3264d3f9 | 3045 | */ |
81a0abd9 | 3046 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
3047 | { |
3048 | unsigned int i; | |
3264d3f9 LT |
3049 | |
3050 | /* Set up the convenience variables */ | |
3051 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
3052 | info->secstrings = (void *)info->hdr |
3053 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 3054 | |
5fdc7db6 JY |
3055 | /* Try to find a name early so we can log errors with a module name */ |
3056 | info->index.info = find_sec(info, ".modinfo"); | |
3057 | if (!info->index.info) | |
3058 | info->name = "(missing .modinfo section)"; | |
3059 | else | |
3060 | info->name = get_modinfo(info, "name"); | |
3264d3f9 | 3061 | |
8b5f61a7 RR |
3062 | /* Find internal symbols and strings. */ |
3063 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
3064 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
3065 | info->index.sym = i; | |
3066 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
3067 | info->strtab = (char *)info->hdr |
3068 | + info->sechdrs[info->index.str].sh_offset; | |
3069 | break; | |
3264d3f9 | 3070 | } |
3264d3f9 LT |
3071 | } |
3072 | ||
5fdc7db6 JY |
3073 | if (info->index.sym == 0) { |
3074 | pr_warn("%s: module has no symbols (stripped?)\n", info->name); | |
3075 | return -ENOEXEC; | |
3076 | } | |
3077 | ||
49668688 | 3078 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 3079 | if (!info->index.mod) { |
3e2e857f KC |
3080 | pr_warn("%s: No module found in object\n", |
3081 | info->name ?: "(missing .modinfo name field)"); | |
81a0abd9 | 3082 | return -ENOEXEC; |
3264d3f9 LT |
3083 | } |
3084 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 3085 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 3086 | |
3e2e857f | 3087 | /* |
5fdc7db6 | 3088 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
3089 | * on-disk struct mod 'name' field. |
3090 | */ | |
3091 | if (!info->name) | |
81a0abd9 | 3092 | info->name = info->mod->name; |
3e2e857f | 3093 | |
5fdc7db6 JY |
3094 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
3095 | info->index.vers = 0; /* Pretend no __versions section! */ | |
3096 | else | |
3097 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 3098 | |
49668688 | 3099 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3100 | |
81a0abd9 | 3101 | return 0; |
3264d3f9 LT |
3102 | } |
3103 | ||
2f3238ae | 3104 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3105 | { |
49668688 | 3106 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3107 | int err; |
3108 | ||
2f3238ae RR |
3109 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3110 | modmagic = NULL; | |
3111 | ||
40dd2560 RR |
3112 | /* This is allowed: modprobe --force will invalidate it. */ |
3113 | if (!modmagic) { | |
3114 | err = try_to_force_load(mod, "bad vermagic"); | |
3115 | if (err) | |
3116 | return err; | |
49668688 | 3117 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3118 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3119 | info->name, modmagic, vermagic); |
40dd2560 RR |
3120 | return -ENOEXEC; |
3121 | } | |
3122 | ||
3205c36c LP |
3123 | if (!get_modinfo(info, "intree")) { |
3124 | if (!test_taint(TAINT_OOT_MODULE)) | |
3125 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3126 | mod->name); | |
373d4d09 | 3127 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3128 | } |
2449b8ba | 3129 | |
caf7501a AK |
3130 | check_modinfo_retpoline(mod, info); |
3131 | ||
49668688 | 3132 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3133 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3134 | pr_warn("%s: module is from the staging directory, the quality " |
3135 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3136 | } |
22e268eb | 3137 | |
2992ef29 | 3138 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3139 | if (err) |
3140 | return err; | |
3141 | ||
22e268eb | 3142 | /* Set up license info based on the info section */ |
49668688 | 3143 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3144 | |
40dd2560 RR |
3145 | return 0; |
3146 | } | |
3147 | ||
eb3057df | 3148 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3149 | { |
49668688 | 3150 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3151 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3152 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3153 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3154 | mod->crcs = section_addr(info, "__kcrctab"); |
3155 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3156 | sizeof(*mod->gpl_syms), |
3157 | &mod->num_gpl_syms); | |
49668688 RR |
3158 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3159 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3160 | "__ksymtab_gpl_future", |
3161 | sizeof(*mod->gpl_future_syms), | |
3162 | &mod->num_gpl_future_syms); | |
49668688 | 3163 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3164 | |
3165 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3166 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3167 | sizeof(*mod->unused_syms), |
3168 | &mod->num_unused_syms); | |
49668688 RR |
3169 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3170 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3171 | sizeof(*mod->unused_gpl_syms), |
3172 | &mod->num_unused_gpl_syms); | |
49668688 | 3173 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3174 | #endif |
3175 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3176 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3177 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3178 | if (!mod->ctors) |
3179 | mod->ctors = section_objs(info, ".init_array", | |
3180 | sizeof(*mod->ctors), &mod->num_ctors); | |
3181 | else if (find_sec(info, ".init_array")) { | |
3182 | /* | |
3183 | * This shouldn't happen with same compiler and binutils | |
3184 | * building all parts of the module. | |
3185 | */ | |
6da0b565 | 3186 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3187 | mod->name); |
3188 | return -EINVAL; | |
3189 | } | |
f91a13bb LT |
3190 | #endif |
3191 | ||
3192 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3193 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3194 | sizeof(*mod->tracepoints_ptrs), | |
3195 | &mod->num_tracepoints); | |
f91a13bb | 3196 | #endif |
fe15b50c PM |
3197 | #ifdef CONFIG_TREE_SRCU |
3198 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
3199 | sizeof(*mod->srcu_struct_ptrs), | |
3200 | &mod->num_srcu_structs); | |
3201 | #endif | |
a38d1107 MM |
3202 | #ifdef CONFIG_BPF_EVENTS |
3203 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3204 | sizeof(*mod->bpf_raw_events), | |
3205 | &mod->num_bpf_raw_events); | |
3206 | #endif | |
e9666d10 | 3207 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3208 | mod->jump_entries = section_objs(info, "__jump_table", |
3209 | sizeof(*mod->jump_entries), | |
3210 | &mod->num_jump_entries); | |
3211 | #endif | |
f91a13bb | 3212 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3213 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3214 | sizeof(*mod->trace_events), |
3215 | &mod->num_trace_events); | |
99be647c JL |
3216 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3217 | sizeof(*mod->trace_evals), | |
3218 | &mod->num_trace_evals); | |
f91a13bb | 3219 | #endif |
13b9b6e7 SR |
3220 | #ifdef CONFIG_TRACING |
3221 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3222 | sizeof(*mod->trace_bprintk_fmt_start), | |
3223 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3224 | #endif |
f91a13bb LT |
3225 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3226 | /* sechdrs[0].sh_size is always zero */ | |
a1326b17 | 3227 | mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION, |
f91a13bb LT |
3228 | sizeof(*mod->ftrace_callsites), |
3229 | &mod->num_ftrace_callsites); | |
3230 | #endif | |
540adea3 MH |
3231 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3232 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3233 | sizeof(*mod->ei_funcs), | |
3234 | &mod->num_ei_funcs); | |
92ace999 | 3235 | #endif |
811d66a0 RR |
3236 | mod->extable = section_objs(info, "__ex_table", |
3237 | sizeof(*mod->extable), &mod->num_exentries); | |
3238 | ||
49668688 | 3239 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3240 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3241 | |
3242 | info->debug = section_objs(info, "__verbose", | |
3243 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3244 | |
3245 | return 0; | |
f91a13bb LT |
3246 | } |
3247 | ||
49668688 | 3248 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3249 | { |
3250 | int i; | |
3251 | void *ptr; | |
3252 | ||
3253 | /* Do the allocs. */ | |
7523e4dc | 3254 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3255 | /* |
3256 | * The pointer to this block is stored in the module structure | |
3257 | * which is inside the block. Just mark it as not being a | |
3258 | * leak. | |
3259 | */ | |
3260 | kmemleak_not_leak(ptr); | |
3261 | if (!ptr) | |
d913188c | 3262 | return -ENOMEM; |
65b8a9b4 | 3263 | |
7523e4dc RR |
3264 | memset(ptr, 0, mod->core_layout.size); |
3265 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3266 | |
7523e4dc RR |
3267 | if (mod->init_layout.size) { |
3268 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3269 | /* |
3270 | * The pointer to this block is stored in the module structure | |
3271 | * which is inside the block. This block doesn't need to be | |
3272 | * scanned as it contains data and code that will be freed | |
3273 | * after the module is initialized. | |
3274 | */ | |
3275 | kmemleak_ignore(ptr); | |
3276 | if (!ptr) { | |
7523e4dc | 3277 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3278 | return -ENOMEM; |
3279 | } | |
7523e4dc RR |
3280 | memset(ptr, 0, mod->init_layout.size); |
3281 | mod->init_layout.base = ptr; | |
82fab442 | 3282 | } else |
7523e4dc | 3283 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3284 | |
3285 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3286 | pr_debug("final section addresses:\n"); |
49668688 | 3287 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3288 | void *dest; |
49668688 | 3289 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3290 | |
49668688 | 3291 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3292 | continue; |
3293 | ||
49668688 | 3294 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3295 | dest = mod->init_layout.base |
49668688 | 3296 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3297 | else |
7523e4dc | 3298 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3299 | |
49668688 RR |
3300 | if (shdr->sh_type != SHT_NOBITS) |
3301 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3302 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3303 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3304 | pr_debug("\t0x%lx %s\n", |
3305 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3306 | } |
d913188c RR |
3307 | |
3308 | return 0; | |
65b8a9b4 LT |
3309 | } |
3310 | ||
49668688 | 3311 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3312 | { |
3205c36c LP |
3313 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3314 | ||
22e268eb RR |
3315 | /* |
3316 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3317 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3318 | * using GPL-only symbols it needs. | |
3319 | */ | |
3320 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3321 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3322 | |
3323 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3324 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3325 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3326 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3327 | |
c99af375 MG |
3328 | /* lve claims to be GPL but upstream won't provide source */ |
3329 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3330 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3331 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3332 | |
3205c36c LP |
3333 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3334 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3335 | ||
22e268eb RR |
3336 | #ifdef CONFIG_MODVERSIONS |
3337 | if ((mod->num_syms && !mod->crcs) | |
3338 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3339 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3340 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3341 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3342 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3343 | #endif | |
3344 | ) { | |
3345 | return try_to_force_load(mod, | |
3346 | "no versions for exported symbols"); | |
3347 | } | |
3348 | #endif | |
3349 | return 0; | |
3350 | } | |
3351 | ||
3352 | static void flush_module_icache(const struct module *mod) | |
3353 | { | |
3354 | mm_segment_t old_fs; | |
3355 | ||
3356 | /* flush the icache in correct context */ | |
3357 | old_fs = get_fs(); | |
3358 | set_fs(KERNEL_DS); | |
3359 | ||
3360 | /* | |
3361 | * Flush the instruction cache, since we've played with text. | |
3362 | * Do it before processing of module parameters, so the module | |
3363 | * can provide parameter accessor functions of its own. | |
3364 | */ | |
7523e4dc RR |
3365 | if (mod->init_layout.base) |
3366 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3367 | (unsigned long)mod->init_layout.base | |
3368 | + mod->init_layout.size); | |
3369 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3370 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3371 | |
3372 | set_fs(old_fs); | |
3373 | } | |
3374 | ||
74e08fcf JB |
3375 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3376 | Elf_Shdr *sechdrs, | |
3377 | char *secstrings, | |
3378 | struct module *mod) | |
3379 | { | |
3380 | return 0; | |
3381 | } | |
3382 | ||
be7de5f9 PB |
3383 | /* module_blacklist is a comma-separated list of module names */ |
3384 | static char *module_blacklist; | |
96b5b194 | 3385 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3386 | { |
3387 | const char *p; | |
3388 | size_t len; | |
3389 | ||
3390 | if (!module_blacklist) | |
3391 | return false; | |
3392 | ||
3393 | for (p = module_blacklist; *p; p += len) { | |
3394 | len = strcspn(p, ","); | |
3395 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3396 | return true; | |
3397 | if (p[len] == ',') | |
3398 | len++; | |
3399 | } | |
3400 | return false; | |
3401 | } | |
3402 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3403 | ||
2f3238ae | 3404 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3405 | { |
1da177e4 | 3406 | struct module *mod; |
444d13ff | 3407 | unsigned int ndx; |
d913188c | 3408 | int err; |
3ae91c21 | 3409 | |
81a0abd9 | 3410 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3411 | if (err) |
3412 | return ERR_PTR(err); | |
1da177e4 | 3413 | |
1da177e4 | 3414 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3415 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3416 | info->secstrings, info->mod); |
1da177e4 | 3417 | if (err < 0) |
8d8022e8 | 3418 | return ERR_PTR(err); |
1da177e4 | 3419 | |
8d8022e8 RR |
3420 | /* We will do a special allocation for per-cpu sections later. */ |
3421 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3422 | |
444d13ff JY |
3423 | /* |
3424 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3425 | * layout_sections() can put it in the right place. | |
3426 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3427 | */ | |
3428 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3429 | if (ndx) |
3430 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3431 | /* | |
3432 | * Mark the __jump_table section as ro_after_init as well: these data | |
3433 | * structures are never modified, with the exception of entries that | |
3434 | * refer to code in the __init section, which are annotated as such | |
3435 | * at module load time. | |
3436 | */ | |
3437 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3438 | if (ndx) |
3439 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3440 | ||
1da177e4 LT |
3441 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3442 | this is done generically; there doesn't appear to be any | |
3443 | special cases for the architectures. */ | |
81a0abd9 JY |
3444 | layout_sections(info->mod, info); |
3445 | layout_symtab(info->mod, info); | |
1da177e4 | 3446 | |
65b8a9b4 | 3447 | /* Allocate and move to the final place */ |
81a0abd9 | 3448 | err = move_module(info->mod, info); |
d913188c | 3449 | if (err) |
8d8022e8 | 3450 | return ERR_PTR(err); |
d913188c RR |
3451 | |
3452 | /* Module has been copied to its final place now: return it. */ | |
3453 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3454 | kmemleak_load_module(mod, info); |
d913188c | 3455 | return mod; |
d913188c RR |
3456 | } |
3457 | ||
3458 | /* mod is no longer valid after this! */ | |
3459 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3460 | { | |
d913188c | 3461 | percpu_modfree(mod); |
d453cded | 3462 | module_arch_freeing_init(mod); |
7523e4dc RR |
3463 | module_memfree(mod->init_layout.base); |
3464 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3465 | } |
3466 | ||
74e08fcf JB |
3467 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3468 | const Elf_Shdr *sechdrs, | |
3469 | struct module *me) | |
3470 | { | |
3471 | return 0; | |
3472 | } | |
3473 | ||
811d66a0 RR |
3474 | static int post_relocation(struct module *mod, const struct load_info *info) |
3475 | { | |
51f3d0f4 | 3476 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3477 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3478 | ||
3479 | /* Copy relocated percpu area over. */ | |
3480 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3481 | info->sechdrs[info->index.pcpu].sh_size); | |
3482 | ||
51f3d0f4 | 3483 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3484 | add_kallsyms(mod, info); |
3485 | ||
3486 | /* Arch-specific module finalizing. */ | |
3487 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3488 | } | |
3489 | ||
9bb9c3be RR |
3490 | /* Is this module of this name done loading? No locks held. */ |
3491 | static bool finished_loading(const char *name) | |
3492 | { | |
3493 | struct module *mod; | |
3494 | bool ret; | |
3495 | ||
9cc019b8 PZ |
3496 | /* |
3497 | * The module_mutex should not be a heavily contended lock; | |
3498 | * if we get the occasional sleep here, we'll go an extra iteration | |
3499 | * in the wait_event_interruptible(), which is harmless. | |
3500 | */ | |
3501 | sched_annotate_sleep(); | |
9bb9c3be | 3502 | mutex_lock(&module_mutex); |
4f6de4d5 | 3503 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 3504 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
3505 | mutex_unlock(&module_mutex); |
3506 | ||
3507 | return ret; | |
3508 | } | |
3509 | ||
34e1169d KC |
3510 | /* Call module constructors. */ |
3511 | static void do_mod_ctors(struct module *mod) | |
3512 | { | |
3513 | #ifdef CONFIG_CONSTRUCTORS | |
3514 | unsigned long i; | |
3515 | ||
3516 | for (i = 0; i < mod->num_ctors; i++) | |
3517 | mod->ctors[i](); | |
3518 | #endif | |
3519 | } | |
3520 | ||
c7496379 RR |
3521 | /* For freeing module_init on success, in case kallsyms traversing */ |
3522 | struct mod_initfree { | |
1a7b7d92 | 3523 | struct llist_node node; |
c7496379 RR |
3524 | void *module_init; |
3525 | }; | |
3526 | ||
1a7b7d92 | 3527 | static void do_free_init(struct work_struct *w) |
c7496379 | 3528 | { |
1a7b7d92 RE |
3529 | struct llist_node *pos, *n, *list; |
3530 | struct mod_initfree *initfree; | |
3531 | ||
3532 | list = llist_del_all(&init_free_list); | |
3533 | ||
3534 | synchronize_rcu(); | |
3535 | ||
3536 | llist_for_each_safe(pos, n, list) { | |
3537 | initfree = container_of(pos, struct mod_initfree, node); | |
3538 | module_memfree(initfree->module_init); | |
3539 | kfree(initfree); | |
3540 | } | |
c7496379 RR |
3541 | } |
3542 | ||
1a7b7d92 RE |
3543 | static int __init modules_wq_init(void) |
3544 | { | |
3545 | INIT_WORK(&init_free_wq, do_free_init); | |
3546 | init_llist_head(&init_free_list); | |
3547 | return 0; | |
3548 | } | |
3549 | module_init(modules_wq_init); | |
3550 | ||
be02a186 JK |
3551 | /* |
3552 | * This is where the real work happens. | |
3553 | * | |
3554 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3555 | * helper command 'lx-symbols'. | |
3556 | */ | |
3557 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3558 | { |
3559 | int ret = 0; | |
c7496379 RR |
3560 | struct mod_initfree *freeinit; |
3561 | ||
3562 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3563 | if (!freeinit) { | |
3564 | ret = -ENOMEM; | |
3565 | goto fail; | |
3566 | } | |
7523e4dc | 3567 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3568 | |
774a1221 TH |
3569 | /* |
3570 | * We want to find out whether @mod uses async during init. Clear | |
3571 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3572 | */ | |
3573 | current->flags &= ~PF_USED_ASYNC; | |
3574 | ||
34e1169d KC |
3575 | do_mod_ctors(mod); |
3576 | /* Start the module */ | |
3577 | if (mod->init != NULL) | |
3578 | ret = do_one_initcall(mod->init); | |
3579 | if (ret < 0) { | |
c7496379 | 3580 | goto fail_free_freeinit; |
34e1169d KC |
3581 | } |
3582 | if (ret > 0) { | |
bddb12b3 AM |
3583 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3584 | "follow 0/-E convention\n" | |
3585 | "%s: loading module anyway...\n", | |
3586 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3587 | dump_stack(); |
3588 | } | |
3589 | ||
3590 | /* Now it's a first class citizen! */ | |
3591 | mod->state = MODULE_STATE_LIVE; | |
3592 | blocking_notifier_call_chain(&module_notify_list, | |
3593 | MODULE_STATE_LIVE, mod); | |
3594 | ||
774a1221 TH |
3595 | /* |
3596 | * We need to finish all async code before the module init sequence | |
3597 | * is done. This has potential to deadlock. For example, a newly | |
3598 | * detected block device can trigger request_module() of the | |
3599 | * default iosched from async probing task. Once userland helper | |
3600 | * reaches here, async_synchronize_full() will wait on the async | |
3601 | * task waiting on request_module() and deadlock. | |
3602 | * | |
3603 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3604 | * iff module init queued any async jobs. This isn't a full | |
3605 | * solution as it will deadlock the same if module loading from | |
3606 | * async jobs nests more than once; however, due to the various | |
3607 | * constraints, this hack seems to be the best option for now. | |
3608 | * Please refer to the following thread for details. | |
3609 | * | |
3610 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3611 | */ | |
f2411da7 | 3612 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3613 | async_synchronize_full(); |
34e1169d | 3614 | |
aba4b5c2 | 3615 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3616 | mod->init_layout.size); |
34e1169d KC |
3617 | mutex_lock(&module_mutex); |
3618 | /* Drop initial reference. */ | |
3619 | module_put(mod); | |
3620 | trim_init_extable(mod); | |
3621 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3622 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3623 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3624 | #endif |
444d13ff | 3625 | module_enable_ro(mod, true); |
93c2e105 | 3626 | mod_tree_remove_init(mod); |
d453cded | 3627 | module_arch_freeing_init(mod); |
7523e4dc RR |
3628 | mod->init_layout.base = NULL; |
3629 | mod->init_layout.size = 0; | |
3630 | mod->init_layout.ro_size = 0; | |
444d13ff | 3631 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3632 | mod->init_layout.text_size = 0; |
c7496379 RR |
3633 | /* |
3634 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3635 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3636 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3637 | * path. module_memfree() cannot be called in an interrupt, so do the |
3638 | * work and call synchronize_rcu() in a work queue. | |
3639 | * | |
ae646f0b JH |
3640 | * Note that module_alloc() on most architectures creates W+X page |
3641 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3642 | * code such as mark_rodata_ro() which depends on those mappings to | |
3643 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3644 | * rcu_barrier() |
c7496379 | 3645 | */ |
1a7b7d92 RE |
3646 | if (llist_add(&freeinit->node, &init_free_list)) |
3647 | schedule_work(&init_free_wq); | |
3648 | ||
34e1169d KC |
3649 | mutex_unlock(&module_mutex); |
3650 | wake_up_all(&module_wq); | |
3651 | ||
3652 | return 0; | |
c7496379 RR |
3653 | |
3654 | fail_free_freeinit: | |
3655 | kfree(freeinit); | |
3656 | fail: | |
3657 | /* Try to protect us from buggy refcounters. */ | |
3658 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3659 | synchronize_rcu(); |
c7496379 RR |
3660 | module_put(mod); |
3661 | blocking_notifier_call_chain(&module_notify_list, | |
3662 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3663 | klp_module_going(mod); |
7dcd182b | 3664 | ftrace_release_mod(mod); |
c7496379 RR |
3665 | free_module(mod); |
3666 | wake_up_all(&module_wq); | |
3667 | return ret; | |
34e1169d KC |
3668 | } |
3669 | ||
3670 | static int may_init_module(void) | |
3671 | { | |
3672 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3673 | return -EPERM; | |
3674 | ||
3675 | return 0; | |
3676 | } | |
3677 | ||
a3535c7e RR |
3678 | /* |
3679 | * We try to place it in the list now to make sure it's unique before | |
3680 | * we dedicate too many resources. In particular, temporary percpu | |
3681 | * memory exhaustion. | |
3682 | */ | |
3683 | static int add_unformed_module(struct module *mod) | |
3684 | { | |
3685 | int err; | |
3686 | struct module *old; | |
3687 | ||
3688 | mod->state = MODULE_STATE_UNFORMED; | |
3689 | ||
3690 | again: | |
3691 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3692 | old = find_module_all(mod->name, strlen(mod->name), true); |
3693 | if (old != NULL) { | |
6e6de3de | 3694 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
3695 | /* Wait in case it fails to load. */ |
3696 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3697 | err = wait_event_interruptible(module_wq, |
3698 | finished_loading(mod->name)); | |
a3535c7e RR |
3699 | if (err) |
3700 | goto out_unlocked; | |
3701 | goto again; | |
3702 | } | |
3703 | err = -EEXIST; | |
3704 | goto out; | |
3705 | } | |
4f666546 | 3706 | mod_update_bounds(mod); |
a3535c7e | 3707 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3708 | mod_tree_insert(mod); |
a3535c7e RR |
3709 | err = 0; |
3710 | ||
3711 | out: | |
3712 | mutex_unlock(&module_mutex); | |
3713 | out_unlocked: | |
3714 | return err; | |
3715 | } | |
3716 | ||
3717 | static int complete_formation(struct module *mod, struct load_info *info) | |
3718 | { | |
3719 | int err; | |
3720 | ||
3721 | mutex_lock(&module_mutex); | |
3722 | ||
3723 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3724 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3725 | if (err < 0) |
3726 | goto out; | |
3727 | ||
3728 | /* This relies on module_mutex for list integrity. */ | |
3729 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3730 | ||
444d13ff | 3731 | module_enable_ro(mod, false); |
85c898db | 3732 | module_enable_nx(mod); |
4982223e | 3733 | |
a3535c7e RR |
3734 | /* Mark state as coming so strong_try_module_get() ignores us, |
3735 | * but kallsyms etc. can see us. */ | |
3736 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3737 | mutex_unlock(&module_mutex); |
3738 | ||
4982223e | 3739 | return 0; |
a3535c7e RR |
3740 | |
3741 | out: | |
3742 | mutex_unlock(&module_mutex); | |
3743 | return err; | |
3744 | } | |
3745 | ||
4c973d16 JY |
3746 | static int prepare_coming_module(struct module *mod) |
3747 | { | |
7e545d6e JY |
3748 | int err; |
3749 | ||
4c973d16 | 3750 | ftrace_module_enable(mod); |
7e545d6e JY |
3751 | err = klp_module_coming(mod); |
3752 | if (err) | |
3753 | return err; | |
3754 | ||
e585e646 DI |
3755 | /* Make module executable after ftrace is enabled */ |
3756 | mutex_lock(&module_mutex); | |
3757 | module_enable_x(mod); | |
3758 | mutex_unlock(&module_mutex); | |
3759 | ||
4c973d16 JY |
3760 | blocking_notifier_call_chain(&module_notify_list, |
3761 | MODULE_STATE_COMING, mod); | |
3762 | return 0; | |
3763 | } | |
3764 | ||
ecc86170 LR |
3765 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3766 | void *arg) | |
54041d8a | 3767 | { |
f2411da7 LR |
3768 | struct module *mod = arg; |
3769 | int ret; | |
3770 | ||
3771 | if (strcmp(param, "async_probe") == 0) { | |
3772 | mod->async_probe_requested = true; | |
3773 | return 0; | |
3774 | } | |
3775 | ||
6da0b565 | 3776 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3777 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3778 | if (ret != 0) |
3779 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3780 | return 0; |
3781 | } | |
3782 | ||
d913188c RR |
3783 | /* Allocate and load the module: note that size of section 0 is always |
3784 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3785 | static int load_module(struct load_info *info, const char __user *uargs, |
3786 | int flags) | |
d913188c | 3787 | { |
a3535c7e | 3788 | struct module *mod; |
5fdc7db6 | 3789 | long err = 0; |
51e158c1 | 3790 | char *after_dashes; |
d913188c | 3791 | |
5fdc7db6 JY |
3792 | err = elf_header_check(info); |
3793 | if (err) | |
3794 | goto free_copy; | |
3795 | ||
3796 | err = setup_load_info(info, flags); | |
3797 | if (err) | |
3798 | goto free_copy; | |
3799 | ||
3800 | if (blacklisted(info->name)) { | |
3801 | err = -EPERM; | |
3802 | goto free_copy; | |
3803 | } | |
3804 | ||
bca014ca | 3805 | err = module_sig_check(info, flags); |
34e1169d KC |
3806 | if (err) |
3807 | goto free_copy; | |
d913188c | 3808 | |
5fdc7db6 | 3809 | err = rewrite_section_headers(info, flags); |
d913188c | 3810 | if (err) |
34e1169d | 3811 | goto free_copy; |
d913188c | 3812 | |
5fdc7db6 JY |
3813 | /* Check module struct version now, before we try to use module. */ |
3814 | if (!check_modstruct_version(info, info->mod)) { | |
3815 | err = -ENOEXEC; | |
3816 | goto free_copy; | |
3817 | } | |
3818 | ||
d913188c | 3819 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3820 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3821 | if (IS_ERR(mod)) { |
3822 | err = PTR_ERR(mod); | |
d913188c | 3823 | goto free_copy; |
1da177e4 | 3824 | } |
1da177e4 | 3825 | |
ca86cad7 RGB |
3826 | audit_log_kern_module(mod->name); |
3827 | ||
a3535c7e RR |
3828 | /* Reserve our place in the list. */ |
3829 | err = add_unformed_module(mod); | |
3830 | if (err) | |
1fb9341a | 3831 | goto free_module; |
1fb9341a | 3832 | |
106a4ee2 | 3833 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3834 | mod->sig_ok = info->sig_ok; |
64748a2c | 3835 | if (!mod->sig_ok) { |
bddb12b3 | 3836 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3837 | "and/or required key missing - tainting " |
bddb12b3 | 3838 | "kernel\n", mod->name); |
66cc69e3 | 3839 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3840 | } |
106a4ee2 RR |
3841 | #endif |
3842 | ||
8d8022e8 | 3843 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3844 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3845 | if (err) |
3846 | goto unlink_mod; | |
3847 | ||
49668688 | 3848 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3849 | err = module_unload_init(mod); |
3850 | if (err) | |
1fb9341a | 3851 | goto unlink_mod; |
1da177e4 | 3852 | |
cf2fde7b | 3853 | init_param_lock(mod); |
b51d23e4 | 3854 | |
22e268eb RR |
3855 | /* Now we've got everything in the final locations, we can |
3856 | * find optional sections. */ | |
eb3057df FH |
3857 | err = find_module_sections(mod, info); |
3858 | if (err) | |
3859 | goto free_unload; | |
9b37ccfc | 3860 | |
49668688 | 3861 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3862 | if (err) |
3863 | goto free_unload; | |
9841d61d | 3864 | |
c988d2b2 | 3865 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3866 | setup_modinfo(mod, info); |
c988d2b2 | 3867 | |
1da177e4 | 3868 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3869 | err = simplify_symbols(mod, info); |
1da177e4 | 3870 | if (err < 0) |
d913188c | 3871 | goto free_modinfo; |
1da177e4 | 3872 | |
34e1169d | 3873 | err = apply_relocations(mod, info); |
22e268eb | 3874 | if (err < 0) |
d913188c | 3875 | goto free_modinfo; |
1da177e4 | 3876 | |
34e1169d | 3877 | err = post_relocation(mod, info); |
1da177e4 | 3878 | if (err < 0) |
d913188c | 3879 | goto free_modinfo; |
1da177e4 | 3880 | |
22e268eb | 3881 | flush_module_icache(mod); |
378bac82 | 3882 | |
6526c534 RR |
3883 | /* Now copy in args */ |
3884 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3885 | if (IS_ERR(mod->args)) { | |
3886 | err = PTR_ERR(mod->args); | |
3887 | goto free_arch_cleanup; | |
3888 | } | |
8d3b33f6 | 3889 | |
52796312 | 3890 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3891 | |
a949ae56 SRRH |
3892 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3893 | ftrace_module_init(mod); | |
3894 | ||
a3535c7e RR |
3895 | /* Finally it's fully formed, ready to start executing. */ |
3896 | err = complete_formation(mod, info); | |
3897 | if (err) | |
1fb9341a | 3898 | goto ddebug_cleanup; |
be593f4c | 3899 | |
4c973d16 JY |
3900 | err = prepare_coming_module(mod); |
3901 | if (err) | |
3902 | goto bug_cleanup; | |
3903 | ||
51f3d0f4 | 3904 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3905 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3906 | -32768, 32767, mod, |
ecc86170 | 3907 | unknown_module_param_cb); |
51e158c1 RR |
3908 | if (IS_ERR(after_dashes)) { |
3909 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3910 | goto coming_cleanup; |
51e158c1 RR |
3911 | } else if (after_dashes) { |
3912 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3913 | mod->name, after_dashes); | |
3914 | } | |
1da177e4 | 3915 | |
ca86cad7 | 3916 | /* Link in to sysfs. */ |
34e1169d | 3917 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3918 | if (err < 0) |
4c973d16 | 3919 | goto coming_cleanup; |
80a3d1bb | 3920 | |
1ce15ef4 JY |
3921 | if (is_livepatch_module(mod)) { |
3922 | err = copy_module_elf(mod, info); | |
3923 | if (err < 0) | |
3924 | goto sysfs_cleanup; | |
3925 | } | |
3926 | ||
48fd1188 | 3927 | /* Get rid of temporary copy. */ |
34e1169d | 3928 | free_copy(info); |
1da177e4 LT |
3929 | |
3930 | /* Done! */ | |
51f3d0f4 | 3931 | trace_module_load(mod); |
34e1169d KC |
3932 | |
3933 | return do_init_module(mod); | |
1da177e4 | 3934 | |
1ce15ef4 JY |
3935 | sysfs_cleanup: |
3936 | mod_sysfs_teardown(mod); | |
4c973d16 | 3937 | coming_cleanup: |
885a78d4 | 3938 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3939 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3940 | blocking_notifier_call_chain(&module_notify_list, |
3941 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3942 | klp_module_going(mod); |
1fb9341a RR |
3943 | bug_cleanup: |
3944 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3945 | mutex_lock(&module_mutex); |
5336377d | 3946 | module_bug_cleanup(mod); |
ee61abb3 | 3947 | mutex_unlock(&module_mutex); |
ff7e0055 | 3948 | |
a3535c7e | 3949 | ddebug_cleanup: |
1323eac7 | 3950 | ftrace_release_mod(mod); |
52796312 | 3951 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 3952 | synchronize_rcu(); |
6526c534 RR |
3953 | kfree(mod->args); |
3954 | free_arch_cleanup: | |
1da177e4 | 3955 | module_arch_cleanup(mod); |
d913188c | 3956 | free_modinfo: |
a263f776 | 3957 | free_modinfo(mod); |
22e268eb | 3958 | free_unload: |
1da177e4 | 3959 | module_unload_free(mod); |
1fb9341a RR |
3960 | unlink_mod: |
3961 | mutex_lock(&module_mutex); | |
3962 | /* Unlink carefully: kallsyms could be walking list. */ | |
3963 | list_del_rcu(&mod->list); | |
758556bd | 3964 | mod_tree_remove(mod); |
1fb9341a | 3965 | wake_up_all(&module_wq); |
0be964be | 3966 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 3967 | synchronize_rcu(); |
1fb9341a | 3968 | mutex_unlock(&module_mutex); |
d913188c | 3969 | free_module: |
35a9393c | 3970 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3971 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3972 | |
34e1169d | 3973 | module_deallocate(mod, info); |
d913188c | 3974 | free_copy: |
34e1169d KC |
3975 | free_copy(info); |
3976 | return err; | |
b99b87f7 PO |
3977 | } |
3978 | ||
17da2bd9 HC |
3979 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3980 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3981 | { |
34e1169d KC |
3982 | int err; |
3983 | struct load_info info = { }; | |
1da177e4 | 3984 | |
34e1169d KC |
3985 | err = may_init_module(); |
3986 | if (err) | |
3987 | return err; | |
1da177e4 | 3988 | |
34e1169d KC |
3989 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3990 | umod, len, uargs); | |
1da177e4 | 3991 | |
34e1169d KC |
3992 | err = copy_module_from_user(umod, len, &info); |
3993 | if (err) | |
3994 | return err; | |
1da177e4 | 3995 | |
2f3238ae | 3996 | return load_module(&info, uargs, 0); |
34e1169d | 3997 | } |
94462ad3 | 3998 | |
2f3238ae | 3999 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 4000 | { |
34e1169d | 4001 | struct load_info info = { }; |
a1db7420 MZ |
4002 | loff_t size; |
4003 | void *hdr; | |
4004 | int err; | |
94462ad3 | 4005 | |
34e1169d KC |
4006 | err = may_init_module(); |
4007 | if (err) | |
4008 | return err; | |
1da177e4 | 4009 | |
2f3238ae | 4010 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 4011 | |
2f3238ae RR |
4012 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
4013 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
4014 | return -EINVAL; | |
d6de2c80 | 4015 | |
a1db7420 MZ |
4016 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
4017 | READING_MODULE); | |
34e1169d KC |
4018 | if (err) |
4019 | return err; | |
a1db7420 MZ |
4020 | info.hdr = hdr; |
4021 | info.len = size; | |
1da177e4 | 4022 | |
2f3238ae | 4023 | return load_module(&info, uargs, flags); |
1da177e4 LT |
4024 | } |
4025 | ||
4026 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
4027 | { | |
4028 | return ((void *)addr >= start && (void *)addr < start + size); | |
4029 | } | |
4030 | ||
4031 | #ifdef CONFIG_KALLSYMS | |
4032 | /* | |
4033 | * This ignores the intensely annoying "mapping symbols" found | |
4034 | * in ARM ELF files: $a, $t and $d. | |
4035 | */ | |
4036 | static inline int is_arm_mapping_symbol(const char *str) | |
4037 | { | |
2e3a10a1 RK |
4038 | if (str[0] == '.' && str[1] == 'L') |
4039 | return true; | |
6c34f1f5 | 4040 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
4041 | && (str[2] == '\0' || str[2] == '.'); |
4042 | } | |
4043 | ||
2d25bc55 | 4044 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 4045 | { |
8244062e | 4046 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
4047 | } |
4048 | ||
2d25bc55 JY |
4049 | /* |
4050 | * Given a module and address, find the corresponding symbol and return its name | |
4051 | * while providing its size and offset if needed. | |
4052 | */ | |
4053 | static const char *find_kallsyms_symbol(struct module *mod, | |
4054 | unsigned long addr, | |
4055 | unsigned long *size, | |
4056 | unsigned long *offset) | |
1da177e4 LT |
4057 | { |
4058 | unsigned int i, best = 0; | |
93d77e7f | 4059 | unsigned long nextval, bestval; |
8244062e | 4060 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
4061 | |
4062 | /* At worse, next value is at end of module */ | |
a06f6211 | 4063 | if (within_module_init(addr, mod)) |
7523e4dc | 4064 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 4065 | else |
7523e4dc | 4066 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 4067 | |
93d77e7f VW |
4068 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
4069 | ||
25985edc | 4070 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 4071 | starts real symbols at 1). */ |
8244062e | 4072 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
4073 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
4074 | unsigned long thisval = kallsyms_symbol_value(sym); | |
4075 | ||
4076 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
4077 | continue; |
4078 | ||
4079 | /* We ignore unnamed symbols: they're uninformative | |
4080 | * and inserted at a whim. */ | |
2d25bc55 JY |
4081 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
4082 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
4083 | continue; |
4084 | ||
93d77e7f | 4085 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 4086 | best = i; |
93d77e7f VW |
4087 | bestval = thisval; |
4088 | } | |
4089 | if (thisval > addr && thisval < nextval) | |
4090 | nextval = thisval; | |
1da177e4 LT |
4091 | } |
4092 | ||
4093 | if (!best) | |
4094 | return NULL; | |
4095 | ||
ffb45122 | 4096 | if (size) |
93d77e7f | 4097 | *size = nextval - bestval; |
ffb45122 | 4098 | if (offset) |
93d77e7f | 4099 | *offset = addr - bestval; |
2d25bc55 JY |
4100 | |
4101 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
4102 | } |
4103 | ||
b865ea64 SS |
4104 | void * __weak dereference_module_function_descriptor(struct module *mod, |
4105 | void *ptr) | |
4106 | { | |
4107 | return ptr; | |
4108 | } | |
4109 | ||
6dd06c9f RR |
4110 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
4111 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 4112 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
4113 | unsigned long *size, |
4114 | unsigned long *offset, | |
4115 | char **modname, | |
4116 | char *namebuf) | |
1da177e4 | 4117 | { |
cb2a5205 | 4118 | const char *ret = NULL; |
b7df4d1b | 4119 | struct module *mod; |
1da177e4 | 4120 | |
cb2a5205 | 4121 | preempt_disable(); |
b7df4d1b PZ |
4122 | mod = __module_address(addr); |
4123 | if (mod) { | |
4124 | if (modname) | |
4125 | *modname = mod->name; | |
2d25bc55 JY |
4126 | |
4127 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4128 | } |
6dd06c9f RR |
4129 | /* Make a copy in here where it's safe */ |
4130 | if (ret) { | |
4131 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4132 | ret = namebuf; | |
4133 | } | |
cb2a5205 | 4134 | preempt_enable(); |
b7df4d1b | 4135 | |
92dfc9dc | 4136 | return ret; |
1da177e4 LT |
4137 | } |
4138 | ||
9d65cb4a AD |
4139 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4140 | { | |
4141 | struct module *mod; | |
4142 | ||
cb2a5205 | 4143 | preempt_disable(); |
d72b3751 | 4144 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4145 | if (mod->state == MODULE_STATE_UNFORMED) |
4146 | continue; | |
9b20a352 | 4147 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4148 | const char *sym; |
4149 | ||
2d25bc55 | 4150 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4151 | if (!sym) |
4152 | goto out; | |
2d25bc55 | 4153 | |
9281acea | 4154 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4155 | preempt_enable(); |
9d65cb4a AD |
4156 | return 0; |
4157 | } | |
4158 | } | |
4159 | out: | |
cb2a5205 | 4160 | preempt_enable(); |
9d65cb4a AD |
4161 | return -ERANGE; |
4162 | } | |
4163 | ||
a5c43dae AD |
4164 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4165 | unsigned long *offset, char *modname, char *name) | |
4166 | { | |
4167 | struct module *mod; | |
4168 | ||
cb2a5205 | 4169 | preempt_disable(); |
d72b3751 | 4170 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4171 | if (mod->state == MODULE_STATE_UNFORMED) |
4172 | continue; | |
9b20a352 | 4173 | if (within_module(addr, mod)) { |
a5c43dae AD |
4174 | const char *sym; |
4175 | ||
2d25bc55 | 4176 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4177 | if (!sym) |
4178 | goto out; | |
4179 | if (modname) | |
9281acea | 4180 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4181 | if (name) |
9281acea | 4182 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4183 | preempt_enable(); |
a5c43dae AD |
4184 | return 0; |
4185 | } | |
4186 | } | |
4187 | out: | |
cb2a5205 | 4188 | preempt_enable(); |
a5c43dae AD |
4189 | return -ERANGE; |
4190 | } | |
4191 | ||
ea07890a AD |
4192 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4193 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4194 | { |
4195 | struct module *mod; | |
4196 | ||
cb2a5205 | 4197 | preempt_disable(); |
d72b3751 | 4198 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4199 | struct mod_kallsyms *kallsyms; |
4200 | ||
0d21b0e3 RR |
4201 | if (mod->state == MODULE_STATE_UNFORMED) |
4202 | continue; | |
8244062e RR |
4203 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4204 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4205 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4206 | ||
4207 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4208 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4209 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4210 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4211 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4212 | preempt_enable(); |
ea07890a | 4213 | return 0; |
1da177e4 | 4214 | } |
8244062e | 4215 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4216 | } |
cb2a5205 | 4217 | preempt_enable(); |
ea07890a | 4218 | return -ERANGE; |
1da177e4 LT |
4219 | } |
4220 | ||
2d25bc55 JY |
4221 | /* Given a module and name of symbol, find and return the symbol's value */ |
4222 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4223 | { |
4224 | unsigned int i; | |
8244062e | 4225 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4226 | |
93d77e7f VW |
4227 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4228 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4229 | ||
2d25bc55 | 4230 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4231 | sym->st_shndx != SHN_UNDEF) |
4232 | return kallsyms_symbol_value(sym); | |
4233 | } | |
1da177e4 LT |
4234 | return 0; |
4235 | } | |
4236 | ||
4237 | /* Look for this name: can be of form module:name. */ | |
4238 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4239 | { | |
4240 | struct module *mod; | |
4241 | char *colon; | |
4242 | unsigned long ret = 0; | |
4243 | ||
4244 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4245 | preempt_disable(); |
17586188 | 4246 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4247 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4248 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4249 | } else { |
0d21b0e3 RR |
4250 | list_for_each_entry_rcu(mod, &modules, list) { |
4251 | if (mod->state == MODULE_STATE_UNFORMED) | |
4252 | continue; | |
2d25bc55 | 4253 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4254 | break; |
0d21b0e3 | 4255 | } |
1da177e4 | 4256 | } |
cb2a5205 | 4257 | preempt_enable(); |
1da177e4 LT |
4258 | return ret; |
4259 | } | |
75a66614 AK |
4260 | |
4261 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4262 | struct module *, unsigned long), | |
4263 | void *data) | |
4264 | { | |
4265 | struct module *mod; | |
4266 | unsigned int i; | |
4267 | int ret; | |
4268 | ||
0be964be PZ |
4269 | module_assert_mutex(); |
4270 | ||
75a66614 | 4271 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4272 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4273 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4274 | ||
0d21b0e3 RR |
4275 | if (mod->state == MODULE_STATE_UNFORMED) |
4276 | continue; | |
8244062e | 4277 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4278 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4279 | |
93d77e7f | 4280 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4281 | continue; |
4282 | ||
2d25bc55 | 4283 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4284 | mod, kallsyms_symbol_value(sym)); |
75a66614 AK |
4285 | if (ret != 0) |
4286 | return ret; | |
4287 | } | |
4288 | } | |
4289 | return 0; | |
4290 | } | |
1da177e4 LT |
4291 | #endif /* CONFIG_KALLSYMS */ |
4292 | ||
7fd8329b PM |
4293 | /* Maximum number of characters written by module_flags() */ |
4294 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4295 | ||
4296 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4297 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4298 | { |
4299 | int bx = 0; | |
4300 | ||
0d21b0e3 | 4301 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4302 | if (mod->taints || |
4303 | mod->state == MODULE_STATE_GOING || | |
4304 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4305 | buf[bx++] = '('; |
cca3e707 | 4306 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4307 | /* Show a - for module-is-being-unloaded */ |
4308 | if (mod->state == MODULE_STATE_GOING) | |
4309 | buf[bx++] = '-'; | |
4310 | /* Show a + for module-is-being-loaded */ | |
4311 | if (mod->state == MODULE_STATE_COMING) | |
4312 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4313 | buf[bx++] = ')'; |
4314 | } | |
4315 | buf[bx] = '\0'; | |
4316 | ||
4317 | return buf; | |
4318 | } | |
4319 | ||
3b5d5c6b AD |
4320 | #ifdef CONFIG_PROC_FS |
4321 | /* Called by the /proc file system to return a list of modules. */ | |
4322 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4323 | { | |
4324 | mutex_lock(&module_mutex); | |
4325 | return seq_list_start(&modules, *pos); | |
4326 | } | |
4327 | ||
4328 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4329 | { | |
4330 | return seq_list_next(p, &modules, pos); | |
4331 | } | |
4332 | ||
4333 | static void m_stop(struct seq_file *m, void *p) | |
4334 | { | |
4335 | mutex_unlock(&module_mutex); | |
4336 | } | |
4337 | ||
1da177e4 LT |
4338 | static int m_show(struct seq_file *m, void *p) |
4339 | { | |
4340 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4341 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4342 | void *value; |
fa3ba2e8 | 4343 | |
0d21b0e3 RR |
4344 | /* We always ignore unformed modules. */ |
4345 | if (mod->state == MODULE_STATE_UNFORMED) | |
4346 | return 0; | |
4347 | ||
2f0f2a33 | 4348 | seq_printf(m, "%s %u", |
7523e4dc | 4349 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4350 | print_unload_info(m, mod); |
4351 | ||
4352 | /* Informative for users. */ | |
4353 | seq_printf(m, " %s", | |
6da0b565 IA |
4354 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4355 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4356 | "Live"); |
4357 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4358 | value = m->private ? NULL : mod->core_layout.base; |
4359 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4360 | |
fa3ba2e8 FM |
4361 | /* Taints info */ |
4362 | if (mod->taints) | |
21aa9280 | 4363 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4364 | |
6da0b565 | 4365 | seq_puts(m, "\n"); |
1da177e4 LT |
4366 | return 0; |
4367 | } | |
4368 | ||
4369 | /* Format: modulename size refcount deps address | |
4370 | ||
4371 | Where refcount is a number or -, and deps is a comma-separated list | |
4372 | of depends or -. | |
4373 | */ | |
3b5d5c6b | 4374 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4375 | .start = m_start, |
4376 | .next = m_next, | |
4377 | .stop = m_stop, | |
4378 | .show = m_show | |
4379 | }; | |
4380 | ||
516fb7f2 LT |
4381 | /* |
4382 | * This also sets the "private" pointer to non-NULL if the | |
4383 | * kernel pointers should be hidden (so you can just test | |
4384 | * "m->private" to see if you should keep the values private). | |
4385 | * | |
4386 | * We use the same logic as for /proc/kallsyms. | |
4387 | */ | |
3b5d5c6b AD |
4388 | static int modules_open(struct inode *inode, struct file *file) |
4389 | { | |
516fb7f2 LT |
4390 | int err = seq_open(file, &modules_op); |
4391 | ||
4392 | if (!err) { | |
4393 | struct seq_file *m = file->private_data; | |
4394 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4395 | } | |
4396 | ||
3f553b30 | 4397 | return err; |
3b5d5c6b AD |
4398 | } |
4399 | ||
4400 | static const struct file_operations proc_modules_operations = { | |
4401 | .open = modules_open, | |
4402 | .read = seq_read, | |
4403 | .llseek = seq_lseek, | |
4404 | .release = seq_release, | |
4405 | }; | |
4406 | ||
4407 | static int __init proc_modules_init(void) | |
4408 | { | |
4409 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4410 | return 0; | |
4411 | } | |
4412 | module_init(proc_modules_init); | |
4413 | #endif | |
4414 | ||
1da177e4 LT |
4415 | /* Given an address, look for it in the module exception tables. */ |
4416 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4417 | { | |
1da177e4 LT |
4418 | const struct exception_table_entry *e = NULL; |
4419 | struct module *mod; | |
4420 | ||
24da1cbf | 4421 | preempt_disable(); |
5ff22646 PZ |
4422 | mod = __module_address(addr); |
4423 | if (!mod) | |
4424 | goto out; | |
22a8bdeb | 4425 | |
5ff22646 PZ |
4426 | if (!mod->num_exentries) |
4427 | goto out; | |
4428 | ||
4429 | e = search_extable(mod->extable, | |
a94c33dd | 4430 | mod->num_exentries, |
5ff22646 PZ |
4431 | addr); |
4432 | out: | |
24da1cbf | 4433 | preempt_enable(); |
1da177e4 | 4434 | |
5ff22646 PZ |
4435 | /* |
4436 | * Now, if we found one, we are running inside it now, hence | |
4437 | * we cannot unload the module, hence no refcnt needed. | |
4438 | */ | |
1da177e4 LT |
4439 | return e; |
4440 | } | |
4441 | ||
4d435f9d | 4442 | /* |
e610499e RR |
4443 | * is_module_address - is this address inside a module? |
4444 | * @addr: the address to check. | |
4445 | * | |
4446 | * See is_module_text_address() if you simply want to see if the address | |
4447 | * is code (not data). | |
4d435f9d | 4448 | */ |
e610499e | 4449 | bool is_module_address(unsigned long addr) |
4d435f9d | 4450 | { |
e610499e | 4451 | bool ret; |
4d435f9d | 4452 | |
24da1cbf | 4453 | preempt_disable(); |
e610499e | 4454 | ret = __module_address(addr) != NULL; |
24da1cbf | 4455 | preempt_enable(); |
4d435f9d | 4456 | |
e610499e | 4457 | return ret; |
4d435f9d IM |
4458 | } |
4459 | ||
e610499e RR |
4460 | /* |
4461 | * __module_address - get the module which contains an address. | |
4462 | * @addr: the address. | |
4463 | * | |
4464 | * Must be called with preempt disabled or module mutex held so that | |
4465 | * module doesn't get freed during this. | |
4466 | */ | |
714f83d5 | 4467 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4468 | { |
4469 | struct module *mod; | |
4470 | ||
3a642e99 RR |
4471 | if (addr < module_addr_min || addr > module_addr_max) |
4472 | return NULL; | |
4473 | ||
0be964be PZ |
4474 | module_assert_mutex_or_preempt(); |
4475 | ||
6c9692e2 | 4476 | mod = mod_find(addr); |
93c2e105 PZ |
4477 | if (mod) { |
4478 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4479 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4480 | mod = NULL; |
0d21b0e3 | 4481 | } |
93c2e105 | 4482 | return mod; |
1da177e4 | 4483 | } |
c6b37801 | 4484 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4485 | |
e610499e RR |
4486 | /* |
4487 | * is_module_text_address - is this address inside module code? | |
4488 | * @addr: the address to check. | |
4489 | * | |
4490 | * See is_module_address() if you simply want to see if the address is | |
4491 | * anywhere in a module. See kernel_text_address() for testing if an | |
4492 | * address corresponds to kernel or module code. | |
4493 | */ | |
4494 | bool is_module_text_address(unsigned long addr) | |
4495 | { | |
4496 | bool ret; | |
4497 | ||
4498 | preempt_disable(); | |
4499 | ret = __module_text_address(addr) != NULL; | |
4500 | preempt_enable(); | |
4501 | ||
4502 | return ret; | |
4503 | } | |
4504 | ||
4505 | /* | |
4506 | * __module_text_address - get the module whose code contains an address. | |
4507 | * @addr: the address. | |
4508 | * | |
4509 | * Must be called with preempt disabled or module mutex held so that | |
4510 | * module doesn't get freed during this. | |
4511 | */ | |
4512 | struct module *__module_text_address(unsigned long addr) | |
4513 | { | |
4514 | struct module *mod = __module_address(addr); | |
4515 | if (mod) { | |
4516 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4517 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4518 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4519 | mod = NULL; |
4520 | } | |
4521 | return mod; | |
4522 | } | |
c6b37801 | 4523 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4524 | |
1da177e4 LT |
4525 | /* Don't grab lock, we're oopsing. */ |
4526 | void print_modules(void) | |
4527 | { | |
4528 | struct module *mod; | |
7fd8329b | 4529 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4530 | |
b231125a | 4531 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4532 | /* Most callers should already have preempt disabled, but make sure */ |
4533 | preempt_disable(); | |
0d21b0e3 RR |
4534 | list_for_each_entry_rcu(mod, &modules, list) { |
4535 | if (mod->state == MODULE_STATE_UNFORMED) | |
4536 | continue; | |
27bba4d6 | 4537 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4538 | } |
d72b3751 | 4539 | preempt_enable(); |
e14af7ee | 4540 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4541 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4542 | pr_cont("\n"); | |
1da177e4 LT |
4543 | } |
4544 | ||
1da177e4 | 4545 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4546 | /* Generate the signature for all relevant module structures here. |
4547 | * If these change, we don't want to try to parse the module. */ | |
4548 | void module_layout(struct module *mod, | |
4549 | struct modversion_info *ver, | |
4550 | struct kernel_param *kp, | |
4551 | struct kernel_symbol *ks, | |
65498646 | 4552 | struct tracepoint * const *tp) |
8c8ef42a RR |
4553 | { |
4554 | } | |
4555 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4556 | #endif |