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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 | ||
135cc111 MH |
217 | list_for_each_entry_rcu(mod, &modules, list, |
218 | lockdep_is_held(&module_mutex)) { | |
6c9692e2 PZ |
219 | if (within_module(addr, mod)) |
220 | return mod; | |
221 | } | |
222 | ||
223 | return NULL; | |
224 | } | |
225 | ||
226 | #endif /* MODULES_TREE_LOOKUP */ | |
227 | ||
4f666546 PZ |
228 | /* |
229 | * Bounds of module text, for speeding up __module_address. | |
230 | * Protected by module_mutex. | |
231 | */ | |
232 | static void __mod_update_bounds(void *base, unsigned int size) | |
233 | { | |
234 | unsigned long min = (unsigned long)base; | |
235 | unsigned long max = min + size; | |
236 | ||
237 | if (min < module_addr_min) | |
238 | module_addr_min = min; | |
239 | if (max > module_addr_max) | |
240 | module_addr_max = max; | |
241 | } | |
242 | ||
243 | static void mod_update_bounds(struct module *mod) | |
244 | { | |
7523e4dc RR |
245 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
246 | if (mod->init_layout.size) | |
247 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
248 | } |
249 | ||
67fc4e0c JW |
250 | #ifdef CONFIG_KGDB_KDB |
251 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
252 | #endif /* CONFIG_KGDB_KDB */ | |
253 | ||
0be964be PZ |
254 | static void module_assert_mutex(void) |
255 | { | |
256 | lockdep_assert_held(&module_mutex); | |
257 | } | |
258 | ||
259 | static void module_assert_mutex_or_preempt(void) | |
260 | { | |
261 | #ifdef CONFIG_LOCKDEP | |
262 | if (unlikely(!debug_locks)) | |
263 | return; | |
264 | ||
9502514f | 265 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
266 | !lockdep_is_held(&module_mutex)); |
267 | #endif | |
268 | } | |
269 | ||
6727bb9c | 270 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 271 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 272 | |
fda784e5 BM |
273 | /* |
274 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
275 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
276 | */ | |
277 | bool is_module_sig_enforced(void) | |
278 | { | |
279 | return sig_enforce; | |
280 | } | |
281 | EXPORT_SYMBOL(is_module_sig_enforced); | |
282 | ||
8db5da0b MZ |
283 | void set_module_sig_enforced(void) |
284 | { | |
285 | sig_enforce = true; | |
286 | } | |
287 | ||
19e4529e SR |
288 | /* Block module loading/unloading? */ |
289 | int modules_disabled = 0; | |
02608bef | 290 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 291 | |
c9a3ba55 RR |
292 | /* Waiting for a module to finish initializing? */ |
293 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
294 | ||
e041c683 | 295 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 296 | |
6da0b565 | 297 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 298 | { |
e041c683 | 299 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
300 | } |
301 | EXPORT_SYMBOL(register_module_notifier); | |
302 | ||
6da0b565 | 303 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 304 | { |
e041c683 | 305 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
306 | } |
307 | EXPORT_SYMBOL(unregister_module_notifier); | |
308 | ||
71d9f507 MB |
309 | /* |
310 | * We require a truly strong try_module_get(): 0 means success. | |
311 | * Otherwise an error is returned due to ongoing or failed | |
312 | * initialization etc. | |
313 | */ | |
1da177e4 LT |
314 | static inline int strong_try_module_get(struct module *mod) |
315 | { | |
0d21b0e3 | 316 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 317 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
318 | return -EBUSY; |
319 | if (try_module_get(mod)) | |
1da177e4 | 320 | return 0; |
c9a3ba55 RR |
321 | else |
322 | return -ENOENT; | |
1da177e4 LT |
323 | } |
324 | ||
373d4d09 RR |
325 | static inline void add_taint_module(struct module *mod, unsigned flag, |
326 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 327 | { |
373d4d09 | 328 | add_taint(flag, lockdep_ok); |
7fd8329b | 329 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
330 | } |
331 | ||
02a3e59a RD |
332 | /* |
333 | * A thread that wants to hold a reference to a module only while it | |
334 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 335 | */ |
bf262dce | 336 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
337 | { |
338 | module_put(mod); | |
339 | do_exit(code); | |
340 | } | |
341 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 342 | |
1da177e4 | 343 | /* Find a module section: 0 means not found. */ |
49668688 | 344 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
345 | { |
346 | unsigned int i; | |
347 | ||
49668688 RR |
348 | for (i = 1; i < info->hdr->e_shnum; i++) { |
349 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 350 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
351 | if ((shdr->sh_flags & SHF_ALLOC) |
352 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 353 | return i; |
49668688 | 354 | } |
1da177e4 LT |
355 | return 0; |
356 | } | |
357 | ||
5e458cc0 | 358 | /* Find a module section, or NULL. */ |
49668688 | 359 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
360 | { |
361 | /* Section 0 has sh_addr 0. */ | |
49668688 | 362 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
363 | } |
364 | ||
365 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 366 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
367 | const char *name, |
368 | size_t object_size, | |
369 | unsigned int *num) | |
370 | { | |
49668688 | 371 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
372 | |
373 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
374 | *num = info->sechdrs[sec].sh_size / object_size; |
375 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
376 | } |
377 | ||
1da177e4 LT |
378 | /* Provided by the linker */ |
379 | extern const struct kernel_symbol __start___ksymtab[]; | |
380 | extern const struct kernel_symbol __stop___ksymtab[]; | |
381 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
382 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
383 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
384 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
385 | extern const s32 __start___kcrctab[]; |
386 | extern const s32 __start___kcrctab_gpl[]; | |
387 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
388 | #ifdef CONFIG_UNUSED_SYMBOLS |
389 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
390 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
391 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
392 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
393 | extern const s32 __start___kcrctab_unused[]; |
394 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 395 | #endif |
1da177e4 LT |
396 | |
397 | #ifndef CONFIG_MODVERSIONS | |
398 | #define symversion(base, idx) NULL | |
399 | #else | |
f83ca9fe | 400 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
401 | #endif |
402 | ||
dafd0940 RR |
403 | static bool each_symbol_in_section(const struct symsearch *arr, |
404 | unsigned int arrsize, | |
405 | struct module *owner, | |
406 | bool (*fn)(const struct symsearch *syms, | |
407 | struct module *owner, | |
de4d8d53 | 408 | void *data), |
dafd0940 | 409 | void *data) |
ad9546c9 | 410 | { |
de4d8d53 | 411 | unsigned int j; |
ad9546c9 | 412 | |
dafd0940 | 413 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
414 | if (fn(&arr[j], owner, data)) |
415 | return true; | |
f71d20e9 | 416 | } |
dafd0940 RR |
417 | |
418 | return false; | |
ad9546c9 RR |
419 | } |
420 | ||
dafd0940 | 421 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
422 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
423 | struct module *owner, | |
424 | void *data), | |
425 | void *data) | |
ad9546c9 RR |
426 | { |
427 | struct module *mod; | |
44032e63 | 428 | static const struct symsearch arr[] = { |
ad9546c9 | 429 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 430 | NOT_GPL_ONLY, false }, |
ad9546c9 | 431 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
432 | __start___kcrctab_gpl, |
433 | GPL_ONLY, false }, | |
ad9546c9 | 434 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
435 | __start___kcrctab_gpl_future, |
436 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 437 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 438 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
439 | __start___kcrctab_unused, |
440 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 441 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
442 | __start___kcrctab_unused_gpl, |
443 | GPL_ONLY, true }, | |
f7f5b675 | 444 | #endif |
ad9546c9 | 445 | }; |
f71d20e9 | 446 | |
0be964be PZ |
447 | module_assert_mutex_or_preempt(); |
448 | ||
dafd0940 RR |
449 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
450 | return true; | |
f71d20e9 | 451 | |
135cc111 MH |
452 | list_for_each_entry_rcu(mod, &modules, list, |
453 | lockdep_is_held(&module_mutex)) { | |
ad9546c9 RR |
454 | struct symsearch arr[] = { |
455 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 456 | NOT_GPL_ONLY, false }, |
ad9546c9 | 457 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
458 | mod->gpl_crcs, |
459 | GPL_ONLY, false }, | |
ad9546c9 RR |
460 | { mod->gpl_future_syms, |
461 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
462 | mod->gpl_future_crcs, |
463 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 464 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
465 | { mod->unused_syms, |
466 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
467 | mod->unused_crcs, |
468 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
469 | { mod->unused_gpl_syms, |
470 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
471 | mod->unused_gpl_crcs, |
472 | GPL_ONLY, true }, | |
f7f5b675 | 473 | #endif |
ad9546c9 RR |
474 | }; |
475 | ||
0d21b0e3 RR |
476 | if (mod->state == MODULE_STATE_UNFORMED) |
477 | continue; | |
478 | ||
dafd0940 RR |
479 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
480 | return true; | |
481 | } | |
482 | return false; | |
483 | } | |
de4d8d53 | 484 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
485 | |
486 | struct find_symbol_arg { | |
487 | /* Input */ | |
488 | const char *name; | |
489 | bool gplok; | |
490 | bool warn; | |
491 | ||
492 | /* Output */ | |
493 | struct module *owner; | |
71810db2 | 494 | const s32 *crc; |
414fd31b | 495 | const struct kernel_symbol *sym; |
dafd0940 RR |
496 | }; |
497 | ||
2d25bc55 JY |
498 | static bool check_exported_symbol(const struct symsearch *syms, |
499 | struct module *owner, | |
500 | unsigned int symnum, void *data) | |
dafd0940 RR |
501 | { |
502 | struct find_symbol_arg *fsa = data; | |
503 | ||
dafd0940 RR |
504 | if (!fsa->gplok) { |
505 | if (syms->licence == GPL_ONLY) | |
506 | return false; | |
507 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
508 | pr_warn("Symbol %s is being used by a non-GPL module, " |
509 | "which will not be allowed in the future\n", | |
510 | fsa->name); | |
9f28bb7e | 511 | } |
1da177e4 | 512 | } |
ad9546c9 | 513 | |
f7f5b675 | 514 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 515 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
516 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
517 | "using it.\n", fsa->name); | |
518 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
519 | pr_warn("Please evaluate if this is the right api to use and " |
520 | "if it really is, submit a report to the linux kernel " | |
521 | "mailing list together with submitting your code for " | |
bddb12b3 | 522 | "inclusion.\n"); |
dafd0940 | 523 | } |
f7f5b675 | 524 | #endif |
dafd0940 RR |
525 | |
526 | fsa->owner = owner; | |
527 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 528 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
529 | return true; |
530 | } | |
531 | ||
7290d580 AB |
532 | static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
533 | { | |
534 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
535 | return (unsigned long)offset_to_ptr(&sym->value_offset); | |
536 | #else | |
537 | return sym->value; | |
538 | #endif | |
539 | } | |
540 | ||
541 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) | |
542 | { | |
543 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
544 | return offset_to_ptr(&sym->name_offset); | |
545 | #else | |
546 | return sym->name; | |
547 | #endif | |
548 | } | |
549 | ||
8651ec01 MM |
550 | static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
551 | { | |
552 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
069e1c07 WD |
553 | if (!sym->namespace_offset) |
554 | return NULL; | |
8651ec01 MM |
555 | return offset_to_ptr(&sym->namespace_offset); |
556 | #else | |
557 | return sym->namespace; | |
558 | #endif | |
559 | } | |
560 | ||
b605be65 | 561 | static int cmp_name(const void *name, const void *sym) |
403ed278 | 562 | { |
b605be65 | 563 | return strcmp(name, kernel_symbol_name(sym)); |
403ed278 AIB |
564 | } |
565 | ||
2d25bc55 JY |
566 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
567 | struct module *owner, | |
568 | void *data) | |
de4d8d53 RR |
569 | { |
570 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
571 | struct kernel_symbol *sym; |
572 | ||
573 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
574 | sizeof(struct kernel_symbol), cmp_name); | |
575 | ||
2d25bc55 JY |
576 | if (sym != NULL && check_exported_symbol(syms, owner, |
577 | sym - syms->start, data)) | |
403ed278 | 578 | return true; |
de4d8d53 | 579 | |
de4d8d53 RR |
580 | return false; |
581 | } | |
582 | ||
2d25bc55 | 583 | /* Find an exported symbol and return it, along with, (optional) crc and |
75676500 | 584 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
585 | const struct kernel_symbol *find_symbol(const char *name, |
586 | struct module **owner, | |
71810db2 | 587 | const s32 **crc, |
c6b37801 TA |
588 | bool gplok, |
589 | bool warn) | |
dafd0940 RR |
590 | { |
591 | struct find_symbol_arg fsa; | |
592 | ||
593 | fsa.name = name; | |
594 | fsa.gplok = gplok; | |
595 | fsa.warn = warn; | |
596 | ||
2d25bc55 | 597 | if (each_symbol_section(find_exported_symbol_in_section, &fsa)) { |
dafd0940 RR |
598 | if (owner) |
599 | *owner = fsa.owner; | |
600 | if (crc) | |
601 | *crc = fsa.crc; | |
414fd31b | 602 | return fsa.sym; |
dafd0940 RR |
603 | } |
604 | ||
5e124169 | 605 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 606 | return NULL; |
1da177e4 | 607 | } |
c6b37801 | 608 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 609 | |
fe0d34d2 RR |
610 | /* |
611 | * Search for module by name: must hold module_mutex (or preempt disabled | |
612 | * for read-only access). | |
613 | */ | |
4f6de4d5 | 614 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 615 | bool even_unformed) |
1da177e4 LT |
616 | { |
617 | struct module *mod; | |
618 | ||
fe0d34d2 | 619 | module_assert_mutex_or_preempt(); |
0be964be | 620 | |
135cc111 MH |
621 | list_for_each_entry_rcu(mod, &modules, list, |
622 | lockdep_is_held(&module_mutex)) { | |
0d21b0e3 RR |
623 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
624 | continue; | |
4f6de4d5 | 625 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
626 | return mod; |
627 | } | |
628 | return NULL; | |
629 | } | |
0d21b0e3 RR |
630 | |
631 | struct module *find_module(const char *name) | |
632 | { | |
fe0d34d2 | 633 | module_assert_mutex(); |
4f6de4d5 | 634 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 635 | } |
c6b37801 | 636 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
637 | |
638 | #ifdef CONFIG_SMP | |
fbf59bc9 | 639 | |
259354de | 640 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 641 | { |
259354de TH |
642 | return mod->percpu; |
643 | } | |
fbf59bc9 | 644 | |
9eb76d77 | 645 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 646 | { |
9eb76d77 RR |
647 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
648 | unsigned long align = pcpusec->sh_addralign; | |
649 | ||
650 | if (!pcpusec->sh_size) | |
651 | return 0; | |
652 | ||
fbf59bc9 | 653 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
654 | pr_warn("%s: per-cpu alignment %li > %li\n", |
655 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
656 | align = PAGE_SIZE; |
657 | } | |
658 | ||
9eb76d77 | 659 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 660 | if (!mod->percpu) { |
bddb12b3 AM |
661 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
662 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
663 | return -ENOMEM; |
664 | } | |
9eb76d77 | 665 | mod->percpu_size = pcpusec->sh_size; |
259354de | 666 | return 0; |
fbf59bc9 TH |
667 | } |
668 | ||
259354de | 669 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 670 | { |
259354de | 671 | free_percpu(mod->percpu); |
fbf59bc9 TH |
672 | } |
673 | ||
49668688 | 674 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 675 | { |
49668688 | 676 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
677 | } |
678 | ||
259354de TH |
679 | static void percpu_modcopy(struct module *mod, |
680 | const void *from, unsigned long size) | |
6b588c18 TH |
681 | { |
682 | int cpu; | |
683 | ||
684 | for_each_possible_cpu(cpu) | |
259354de | 685 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
686 | } |
687 | ||
383776fa | 688 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
689 | { |
690 | struct module *mod; | |
691 | unsigned int cpu; | |
692 | ||
693 | preempt_disable(); | |
694 | ||
695 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
696 | if (mod->state == MODULE_STATE_UNFORMED) |
697 | continue; | |
10fad5e4 TH |
698 | if (!mod->percpu_size) |
699 | continue; | |
700 | for_each_possible_cpu(cpu) { | |
701 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 702 | void *va = (void *)addr; |
10fad5e4 | 703 | |
383776fa | 704 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 705 | if (can_addr) { |
383776fa | 706 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
707 | *can_addr += (unsigned long) |
708 | per_cpu_ptr(mod->percpu, | |
709 | get_boot_cpu_id()); | |
710 | } | |
10fad5e4 TH |
711 | preempt_enable(); |
712 | return true; | |
713 | } | |
714 | } | |
715 | } | |
716 | ||
717 | preempt_enable(); | |
718 | return false; | |
6b588c18 TH |
719 | } |
720 | ||
383776fa TG |
721 | /** |
722 | * is_module_percpu_address - test whether address is from module static percpu | |
723 | * @addr: address to test | |
724 | * | |
725 | * Test whether @addr belongs to module static percpu area. | |
726 | * | |
727 | * RETURNS: | |
728 | * %true if @addr is from module static percpu area | |
729 | */ | |
730 | bool is_module_percpu_address(unsigned long addr) | |
731 | { | |
732 | return __is_module_percpu_address(addr, NULL); | |
733 | } | |
734 | ||
1da177e4 | 735 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 736 | |
259354de | 737 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
738 | { |
739 | return NULL; | |
740 | } | |
9eb76d77 | 741 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 742 | { |
9eb76d77 RR |
743 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
744 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
745 | return -ENOMEM; | |
746 | return 0; | |
259354de TH |
747 | } |
748 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 749 | { |
1da177e4 | 750 | } |
49668688 | 751 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
752 | { |
753 | return 0; | |
754 | } | |
259354de TH |
755 | static inline void percpu_modcopy(struct module *mod, |
756 | const void *from, unsigned long size) | |
1da177e4 LT |
757 | { |
758 | /* pcpusec should be 0, and size of that section should be 0. */ | |
759 | BUG_ON(size != 0); | |
760 | } | |
10fad5e4 TH |
761 | bool is_module_percpu_address(unsigned long addr) |
762 | { | |
763 | return false; | |
764 | } | |
6b588c18 | 765 | |
383776fa TG |
766 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
767 | { | |
768 | return false; | |
769 | } | |
770 | ||
1da177e4 LT |
771 | #endif /* CONFIG_SMP */ |
772 | ||
c988d2b2 MD |
773 | #define MODINFO_ATTR(field) \ |
774 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
775 | { \ | |
776 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
777 | } \ | |
778 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 779 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 780 | { \ |
cc56ded3 | 781 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
782 | } \ |
783 | static int modinfo_##field##_exists(struct module *mod) \ | |
784 | { \ | |
785 | return mod->field != NULL; \ | |
786 | } \ | |
787 | static void free_modinfo_##field(struct module *mod) \ | |
788 | { \ | |
22a8bdeb DW |
789 | kfree(mod->field); \ |
790 | mod->field = NULL; \ | |
c988d2b2 MD |
791 | } \ |
792 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 793 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
794 | .show = show_modinfo_##field, \ |
795 | .setup = setup_modinfo_##field, \ | |
796 | .test = modinfo_##field##_exists, \ | |
797 | .free = free_modinfo_##field, \ | |
798 | }; | |
799 | ||
800 | MODINFO_ATTR(version); | |
801 | MODINFO_ATTR(srcversion); | |
802 | ||
e14af7ee AV |
803 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
804 | ||
03e88ae1 | 805 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
806 | |
807 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
808 | ||
e513cc1c MH |
809 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
810 | #define MODULE_REF_BASE 1 | |
811 | ||
1da177e4 | 812 | /* Init the unload section of the module. */ |
9f85a4bb | 813 | static int module_unload_init(struct module *mod) |
1da177e4 | 814 | { |
e513cc1c MH |
815 | /* |
816 | * Initialize reference counter to MODULE_REF_BASE. | |
817 | * refcnt == 0 means module is going. | |
818 | */ | |
819 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 820 | |
2c02dfe7 LT |
821 | INIT_LIST_HEAD(&mod->source_list); |
822 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 823 | |
1da177e4 | 824 | /* Hold reference count during initialization. */ |
e513cc1c | 825 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
826 | |
827 | return 0; | |
1da177e4 LT |
828 | } |
829 | ||
1da177e4 LT |
830 | /* Does a already use b? */ |
831 | static int already_uses(struct module *a, struct module *b) | |
832 | { | |
833 | struct module_use *use; | |
834 | ||
2c02dfe7 LT |
835 | list_for_each_entry(use, &b->source_list, source_list) { |
836 | if (use->source == a) { | |
5e124169 | 837 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
838 | return 1; |
839 | } | |
840 | } | |
5e124169 | 841 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
842 | return 0; |
843 | } | |
844 | ||
2c02dfe7 LT |
845 | /* |
846 | * Module a uses b | |
847 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
848 | * - the module_use is added to the list of 'b' sources (so | |
849 | * 'b' can walk the list to see who sourced them), and of 'a' | |
850 | * targets (so 'a' can see what modules it targets). | |
851 | */ | |
852 | static int add_module_usage(struct module *a, struct module *b) | |
853 | { | |
2c02dfe7 LT |
854 | struct module_use *use; |
855 | ||
5e124169 | 856 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 857 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 858 | if (!use) |
2c02dfe7 | 859 | return -ENOMEM; |
2c02dfe7 LT |
860 | |
861 | use->source = a; | |
862 | use->target = b; | |
863 | list_add(&use->source_list, &b->source_list); | |
864 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
865 | return 0; |
866 | } | |
867 | ||
75676500 | 868 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 869 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 870 | { |
c8e21ced | 871 | int err; |
270a6c4c | 872 | |
9bea7f23 | 873 | if (b == NULL || already_uses(a, b)) |
218ce735 | 874 | return 0; |
218ce735 | 875 | |
9bea7f23 RR |
876 | /* If module isn't available, we fail. */ |
877 | err = strong_try_module_get(b); | |
c9a3ba55 | 878 | if (err) |
9bea7f23 | 879 | return err; |
1da177e4 | 880 | |
2c02dfe7 LT |
881 | err = add_module_usage(a, b); |
882 | if (err) { | |
1da177e4 | 883 | module_put(b); |
9bea7f23 | 884 | return err; |
1da177e4 | 885 | } |
9bea7f23 | 886 | return 0; |
1da177e4 | 887 | } |
9bea7f23 | 888 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
889 | |
890 | /* Clear the unload stuff of the module. */ | |
891 | static void module_unload_free(struct module *mod) | |
892 | { | |
2c02dfe7 | 893 | struct module_use *use, *tmp; |
1da177e4 | 894 | |
75676500 | 895 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
896 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
897 | struct module *i = use->target; | |
5e124169 | 898 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
899 | module_put(i); |
900 | list_del(&use->source_list); | |
901 | list_del(&use->target_list); | |
902 | kfree(use); | |
1da177e4 | 903 | } |
75676500 | 904 | mutex_unlock(&module_mutex); |
1da177e4 LT |
905 | } |
906 | ||
907 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 908 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
909 | { |
910 | int ret = (flags & O_TRUNC); | |
911 | if (ret) | |
373d4d09 | 912 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
913 | return ret; |
914 | } | |
915 | #else | |
fb169793 | 916 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
917 | { |
918 | return 0; | |
919 | } | |
920 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
921 | ||
e513cc1c MH |
922 | /* Try to release refcount of module, 0 means success. */ |
923 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 924 | { |
e513cc1c | 925 | int ret; |
1da177e4 | 926 | |
e513cc1c MH |
927 | /* Try to decrement refcnt which we set at loading */ |
928 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
929 | BUG_ON(ret < 0); | |
930 | if (ret) | |
931 | /* Someone can put this right now, recover with checking */ | |
932 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 933 | |
e513cc1c MH |
934 | return ret; |
935 | } | |
1da177e4 | 936 | |
e513cc1c MH |
937 | static int try_stop_module(struct module *mod, int flags, int *forced) |
938 | { | |
da39ba5e | 939 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
940 | if (try_release_module_ref(mod) != 0) { |
941 | *forced = try_force_unload(flags); | |
942 | if (!(*forced)) | |
1da177e4 LT |
943 | return -EWOULDBLOCK; |
944 | } | |
945 | ||
946 | /* Mark it as dying. */ | |
e513cc1c | 947 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 948 | |
e513cc1c | 949 | return 0; |
1da177e4 LT |
950 | } |
951 | ||
d5db139a RR |
952 | /** |
953 | * module_refcount - return the refcount or -1 if unloading | |
954 | * | |
955 | * @mod: the module we're checking | |
956 | * | |
957 | * Returns: | |
958 | * -1 if the module is in the process of unloading | |
959 | * otherwise the number of references in the kernel to the module | |
960 | */ | |
961 | int module_refcount(struct module *mod) | |
1da177e4 | 962 | { |
d5db139a | 963 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
964 | } |
965 | EXPORT_SYMBOL(module_refcount); | |
966 | ||
967 | /* This exists whether we can unload or not */ | |
968 | static void free_module(struct module *mod); | |
969 | ||
17da2bd9 HC |
970 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
971 | unsigned int, flags) | |
1da177e4 LT |
972 | { |
973 | struct module *mod; | |
dfff0a06 | 974 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
975 | int ret, forced = 0; |
976 | ||
3d43321b | 977 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
978 | return -EPERM; |
979 | ||
980 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
981 | return -EFAULT; | |
982 | name[MODULE_NAME_LEN-1] = '\0'; | |
983 | ||
f6276ac9 RGB |
984 | audit_log_kern_module(name); |
985 | ||
3fc1f1e2 TH |
986 | if (mutex_lock_interruptible(&module_mutex) != 0) |
987 | return -EINTR; | |
1da177e4 LT |
988 | |
989 | mod = find_module(name); | |
990 | if (!mod) { | |
991 | ret = -ENOENT; | |
992 | goto out; | |
993 | } | |
994 | ||
2c02dfe7 | 995 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
996 | /* Other modules depend on us: get rid of them first. */ |
997 | ret = -EWOULDBLOCK; | |
998 | goto out; | |
999 | } | |
1000 | ||
1001 | /* Doing init or already dying? */ | |
1002 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 1003 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 1004 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
1005 | ret = -EBUSY; |
1006 | goto out; | |
1007 | } | |
1008 | ||
1009 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 1010 | if (mod->init && !mod->exit) { |
fb169793 | 1011 | forced = try_force_unload(flags); |
1da177e4 LT |
1012 | if (!forced) { |
1013 | /* This module can't be removed */ | |
1014 | ret = -EBUSY; | |
1015 | goto out; | |
1016 | } | |
1017 | } | |
1018 | ||
1da177e4 LT |
1019 | /* Stop the machine so refcounts can't move and disable module. */ |
1020 | ret = try_stop_module(mod, flags, &forced); | |
1021 | if (ret != 0) | |
1022 | goto out; | |
1023 | ||
df4b565e | 1024 | mutex_unlock(&module_mutex); |
25985edc | 1025 | /* Final destruction now no one is using it. */ |
df4b565e | 1026 | if (mod->exit != NULL) |
1da177e4 | 1027 | mod->exit(); |
df4b565e PO |
1028 | blocking_notifier_call_chain(&module_notify_list, |
1029 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1030 | klp_module_going(mod); |
7dcd182b JY |
1031 | ftrace_release_mod(mod); |
1032 | ||
22a9d645 | 1033 | async_synchronize_full(); |
75676500 | 1034 | |
e14af7ee | 1035 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1036 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1037 | |
75676500 | 1038 | free_module(mod); |
31890801 KK |
1039 | /* someone could wait for the module in add_unformed_module() */ |
1040 | wake_up_all(&module_wq); | |
75676500 RR |
1041 | return 0; |
1042 | out: | |
6389a385 | 1043 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1044 | return ret; |
1045 | } | |
1046 | ||
d1e99d7a | 1047 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1048 | { |
1049 | struct module_use *use; | |
1050 | int printed_something = 0; | |
1051 | ||
d5db139a | 1052 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1053 | |
6da0b565 IA |
1054 | /* |
1055 | * Always include a trailing , so userspace can differentiate | |
1056 | * between this and the old multi-field proc format. | |
1057 | */ | |
2c02dfe7 | 1058 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1059 | printed_something = 1; |
2c02dfe7 | 1060 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1061 | } |
1062 | ||
1da177e4 LT |
1063 | if (mod->init != NULL && mod->exit == NULL) { |
1064 | printed_something = 1; | |
6da0b565 | 1065 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1066 | } |
1067 | ||
1068 | if (!printed_something) | |
6da0b565 | 1069 | seq_puts(m, "-"); |
1da177e4 LT |
1070 | } |
1071 | ||
1072 | void __symbol_put(const char *symbol) | |
1073 | { | |
1074 | struct module *owner; | |
1da177e4 | 1075 | |
24da1cbf | 1076 | preempt_disable(); |
414fd31b | 1077 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1078 | BUG(); |
1079 | module_put(owner); | |
24da1cbf | 1080 | preempt_enable(); |
1da177e4 LT |
1081 | } |
1082 | EXPORT_SYMBOL(__symbol_put); | |
1083 | ||
7d1d16e4 | 1084 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1085 | void symbol_put_addr(void *addr) |
1086 | { | |
5e376613 | 1087 | struct module *modaddr; |
7d1d16e4 | 1088 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1089 | |
7d1d16e4 | 1090 | if (core_kernel_text(a)) |
5e376613 | 1091 | return; |
1da177e4 | 1092 | |
275d7d44 PZ |
1093 | /* |
1094 | * Even though we hold a reference on the module; we still need to | |
1095 | * disable preemption in order to safely traverse the data structure. | |
1096 | */ | |
1097 | preempt_disable(); | |
7d1d16e4 | 1098 | modaddr = __module_text_address(a); |
a6e6abd5 | 1099 | BUG_ON(!modaddr); |
5e376613 | 1100 | module_put(modaddr); |
275d7d44 | 1101 | preempt_enable(); |
1da177e4 LT |
1102 | } |
1103 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1104 | ||
1105 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1106 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1107 | { |
d5db139a | 1108 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1109 | } |
1110 | ||
cca3e707 KS |
1111 | static struct module_attribute modinfo_refcnt = |
1112 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1113 | |
d53799be SR |
1114 | void __module_get(struct module *module) |
1115 | { | |
1116 | if (module) { | |
1117 | preempt_disable(); | |
2f35c41f | 1118 | atomic_inc(&module->refcnt); |
d53799be SR |
1119 | trace_module_get(module, _RET_IP_); |
1120 | preempt_enable(); | |
1121 | } | |
1122 | } | |
1123 | EXPORT_SYMBOL(__module_get); | |
1124 | ||
1125 | bool try_module_get(struct module *module) | |
1126 | { | |
1127 | bool ret = true; | |
1128 | ||
1129 | if (module) { | |
1130 | preempt_disable(); | |
e513cc1c MH |
1131 | /* Note: here, we can fail to get a reference */ |
1132 | if (likely(module_is_live(module) && | |
1133 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1134 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1135 | else |
d53799be SR |
1136 | ret = false; |
1137 | ||
1138 | preempt_enable(); | |
1139 | } | |
1140 | return ret; | |
1141 | } | |
1142 | EXPORT_SYMBOL(try_module_get); | |
1143 | ||
f6a57033 AV |
1144 | void module_put(struct module *module) |
1145 | { | |
e513cc1c MH |
1146 | int ret; |
1147 | ||
f6a57033 | 1148 | if (module) { |
e1783a24 | 1149 | preempt_disable(); |
e513cc1c MH |
1150 | ret = atomic_dec_if_positive(&module->refcnt); |
1151 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1152 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1153 | preempt_enable(); |
f6a57033 AV |
1154 | } |
1155 | } | |
1156 | EXPORT_SYMBOL(module_put); | |
1157 | ||
1da177e4 | 1158 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1159 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1160 | { |
1161 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1162 | seq_puts(m, " - -"); |
1da177e4 LT |
1163 | } |
1164 | ||
1165 | static inline void module_unload_free(struct module *mod) | |
1166 | { | |
1167 | } | |
1168 | ||
9bea7f23 | 1169 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1170 | { |
9bea7f23 | 1171 | return strong_try_module_get(b); |
1da177e4 | 1172 | } |
9bea7f23 | 1173 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1174 | |
9f85a4bb | 1175 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1176 | { |
9f85a4bb | 1177 | return 0; |
1da177e4 LT |
1178 | } |
1179 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1180 | ||
53999bf3 KW |
1181 | static size_t module_flags_taint(struct module *mod, char *buf) |
1182 | { | |
1183 | size_t l = 0; | |
7fd8329b PM |
1184 | int i; |
1185 | ||
1186 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1187 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1188 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1189 | } |
53999bf3 | 1190 | |
53999bf3 KW |
1191 | return l; |
1192 | } | |
1193 | ||
1f71740a | 1194 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1195 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1196 | { |
1197 | const char *state = "unknown"; | |
1198 | ||
4befb026 | 1199 | switch (mk->mod->state) { |
1f71740a KS |
1200 | case MODULE_STATE_LIVE: |
1201 | state = "live"; | |
1202 | break; | |
1203 | case MODULE_STATE_COMING: | |
1204 | state = "coming"; | |
1205 | break; | |
1206 | case MODULE_STATE_GOING: | |
1207 | state = "going"; | |
1208 | break; | |
0d21b0e3 RR |
1209 | default: |
1210 | BUG(); | |
1f71740a KS |
1211 | } |
1212 | return sprintf(buffer, "%s\n", state); | |
1213 | } | |
1214 | ||
cca3e707 KS |
1215 | static struct module_attribute modinfo_initstate = |
1216 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1217 | |
88bfa324 KS |
1218 | static ssize_t store_uevent(struct module_attribute *mattr, |
1219 | struct module_kobject *mk, | |
1220 | const char *buffer, size_t count) | |
1221 | { | |
df44b479 PR |
1222 | int rc; |
1223 | ||
1224 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1225 | return rc ? rc : count; | |
88bfa324 KS |
1226 | } |
1227 | ||
cca3e707 KS |
1228 | struct module_attribute module_uevent = |
1229 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1230 | ||
1231 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1232 | struct module_kobject *mk, char *buffer) | |
1233 | { | |
7523e4dc | 1234 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1235 | } |
1236 | ||
1237 | static struct module_attribute modinfo_coresize = | |
1238 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1239 | ||
1240 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1241 | struct module_kobject *mk, char *buffer) | |
1242 | { | |
7523e4dc | 1243 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1244 | } |
1245 | ||
1246 | static struct module_attribute modinfo_initsize = | |
1247 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1248 | ||
1249 | static ssize_t show_taint(struct module_attribute *mattr, | |
1250 | struct module_kobject *mk, char *buffer) | |
1251 | { | |
1252 | size_t l; | |
1253 | ||
1254 | l = module_flags_taint(mk->mod, buffer); | |
1255 | buffer[l++] = '\n'; | |
1256 | return l; | |
1257 | } | |
1258 | ||
1259 | static struct module_attribute modinfo_taint = | |
1260 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1261 | |
03e88ae1 | 1262 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1263 | &module_uevent, |
03e88ae1 GKH |
1264 | &modinfo_version, |
1265 | &modinfo_srcversion, | |
cca3e707 KS |
1266 | &modinfo_initstate, |
1267 | &modinfo_coresize, | |
1268 | &modinfo_initsize, | |
1269 | &modinfo_taint, | |
03e88ae1 | 1270 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1271 | &modinfo_refcnt, |
03e88ae1 GKH |
1272 | #endif |
1273 | NULL, | |
1274 | }; | |
1275 | ||
1da177e4 LT |
1276 | static const char vermagic[] = VERMAGIC_STRING; |
1277 | ||
c6e665c8 | 1278 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1279 | { |
1280 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1281 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1282 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1283 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1284 | return 0; |
1285 | #else | |
1286 | return -ENOEXEC; | |
1287 | #endif | |
1288 | } | |
1289 | ||
1da177e4 | 1290 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1291 | |
1292 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1293 | { |
71810db2 | 1294 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1295 | } |
1296 | ||
49019426 | 1297 | static int check_version(const struct load_info *info, |
1da177e4 | 1298 | const char *symname, |
6da0b565 | 1299 | struct module *mod, |
71810db2 | 1300 | const s32 *crc) |
1da177e4 | 1301 | { |
49019426 KC |
1302 | Elf_Shdr *sechdrs = info->sechdrs; |
1303 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1304 | unsigned int i, num_versions; |
1305 | struct modversion_info *versions; | |
1306 | ||
1307 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1308 | if (!crc) | |
1309 | return 1; | |
1310 | ||
a5dd6970 RR |
1311 | /* No versions at all? modprobe --force does this. */ |
1312 | if (versindex == 0) | |
1313 | return try_to_force_load(mod, symname) == 0; | |
1314 | ||
1da177e4 LT |
1315 | versions = (void *) sechdrs[versindex].sh_addr; |
1316 | num_versions = sechdrs[versindex].sh_size | |
1317 | / sizeof(struct modversion_info); | |
1318 | ||
1319 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1320 | u32 crcval; |
1321 | ||
1da177e4 LT |
1322 | if (strcmp(versions[i].name, symname) != 0) |
1323 | continue; | |
1324 | ||
71810db2 AB |
1325 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1326 | crcval = resolve_rel_crc(crc); | |
1327 | else | |
1328 | crcval = *crc; | |
1329 | if (versions[i].crc == crcval) | |
1da177e4 | 1330 | return 1; |
71810db2 AB |
1331 | pr_debug("Found checksum %X vs module %lX\n", |
1332 | crcval, versions[i].crc); | |
826e4506 | 1333 | goto bad_version; |
1da177e4 | 1334 | } |
826e4506 | 1335 | |
faaae2a5 | 1336 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1337 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1338 | return 1; |
826e4506 LT |
1339 | |
1340 | bad_version: | |
6da0b565 | 1341 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1342 | info->name, symname); |
826e4506 | 1343 | return 0; |
1da177e4 LT |
1344 | } |
1345 | ||
49019426 | 1346 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1347 | struct module *mod) |
1348 | { | |
71810db2 | 1349 | const s32 *crc; |
1da177e4 | 1350 | |
926a59b1 PZ |
1351 | /* |
1352 | * Since this should be found in kernel (which can't be removed), no | |
1353 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1354 | */ | |
1355 | preempt_disable(); | |
996302c5 | 1356 | if (!find_symbol("module_layout", NULL, &crc, true, false)) { |
926a59b1 | 1357 | preempt_enable(); |
1da177e4 | 1358 | BUG(); |
926a59b1 PZ |
1359 | } |
1360 | preempt_enable(); | |
996302c5 | 1361 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1362 | } |
1363 | ||
91e37a79 RR |
1364 | /* First part is kernel version, which we ignore if module has crcs. */ |
1365 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1366 | bool has_crcs) | |
1da177e4 | 1367 | { |
91e37a79 RR |
1368 | if (has_crcs) { |
1369 | amagic += strcspn(amagic, " "); | |
1370 | bmagic += strcspn(bmagic, " "); | |
1371 | } | |
1da177e4 LT |
1372 | return strcmp(amagic, bmagic) == 0; |
1373 | } | |
1374 | #else | |
49019426 | 1375 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1376 | const char *symname, |
6da0b565 | 1377 | struct module *mod, |
71810db2 | 1378 | const s32 *crc) |
1da177e4 LT |
1379 | { |
1380 | return 1; | |
1381 | } | |
1382 | ||
49019426 | 1383 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1384 | struct module *mod) |
1385 | { | |
1386 | return 1; | |
1387 | } | |
1388 | ||
91e37a79 RR |
1389 | static inline int same_magic(const char *amagic, const char *bmagic, |
1390 | bool has_crcs) | |
1da177e4 LT |
1391 | { |
1392 | return strcmp(amagic, bmagic) == 0; | |
1393 | } | |
1394 | #endif /* CONFIG_MODVERSIONS */ | |
1395 | ||
8651ec01 MM |
1396 | static char *get_modinfo(const struct load_info *info, const char *tag); |
1397 | static char *get_next_modinfo(const struct load_info *info, const char *tag, | |
1398 | char *prev); | |
1399 | ||
1400 | static int verify_namespace_is_imported(const struct load_info *info, | |
1401 | const struct kernel_symbol *sym, | |
1402 | struct module *mod) | |
1403 | { | |
1404 | const char *namespace; | |
1405 | char *imported_namespace; | |
1406 | ||
1407 | namespace = kernel_symbol_namespace(sym); | |
1408 | if (namespace) { | |
1409 | imported_namespace = get_modinfo(info, "import_ns"); | |
1410 | while (imported_namespace) { | |
1411 | if (strcmp(namespace, imported_namespace) == 0) | |
1412 | return 0; | |
1413 | imported_namespace = get_next_modinfo( | |
1414 | info, "import_ns", imported_namespace); | |
1415 | } | |
3d52ec5e MM |
1416 | #ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
1417 | pr_warn( | |
1418 | #else | |
1419 | pr_err( | |
1420 | #endif | |
1421 | "%s: module uses symbol (%s) from namespace %s, but does not import it.\n", | |
1422 | mod->name, kernel_symbol_name(sym), namespace); | |
1423 | #ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS | |
8651ec01 | 1424 | return -EINVAL; |
3d52ec5e | 1425 | #endif |
8651ec01 MM |
1426 | } |
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | ||
75676500 | 1431 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1432 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1433 | const struct load_info *info, | |
414fd31b | 1434 | const char *name, |
9bea7f23 | 1435 | char ownername[]) |
1da177e4 LT |
1436 | { |
1437 | struct module *owner; | |
414fd31b | 1438 | const struct kernel_symbol *sym; |
71810db2 | 1439 | const s32 *crc; |
9bea7f23 | 1440 | int err; |
1da177e4 | 1441 | |
d64810f5 PZ |
1442 | /* |
1443 | * The module_mutex should not be a heavily contended lock; | |
1444 | * if we get the occasional sleep here, we'll go an extra iteration | |
1445 | * in the wait_event_interruptible(), which is harmless. | |
1446 | */ | |
1447 | sched_annotate_sleep(); | |
75676500 | 1448 | mutex_lock(&module_mutex); |
414fd31b | 1449 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1450 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1451 | if (!sym) |
1452 | goto unlock; | |
1453 | ||
49019426 | 1454 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1455 | sym = ERR_PTR(-EINVAL); |
1456 | goto getname; | |
1da177e4 | 1457 | } |
9bea7f23 | 1458 | |
8651ec01 MM |
1459 | err = verify_namespace_is_imported(info, sym, mod); |
1460 | if (err) { | |
1461 | sym = ERR_PTR(err); | |
1462 | goto getname; | |
1463 | } | |
1464 | ||
9bea7f23 RR |
1465 | err = ref_module(mod, owner); |
1466 | if (err) { | |
1467 | sym = ERR_PTR(err); | |
1468 | goto getname; | |
1469 | } | |
1470 | ||
1471 | getname: | |
1472 | /* We must make copy under the lock if we failed to get ref. */ | |
1473 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1474 | unlock: | |
75676500 | 1475 | mutex_unlock(&module_mutex); |
218ce735 | 1476 | return sym; |
1da177e4 LT |
1477 | } |
1478 | ||
49668688 RR |
1479 | static const struct kernel_symbol * |
1480 | resolve_symbol_wait(struct module *mod, | |
1481 | const struct load_info *info, | |
1482 | const char *name) | |
9bea7f23 RR |
1483 | { |
1484 | const struct kernel_symbol *ksym; | |
49668688 | 1485 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1486 | |
1487 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1488 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1489 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1490 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1491 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1492 | mod->name, owner); | |
9bea7f23 RR |
1493 | } |
1494 | return ksym; | |
1495 | } | |
1496 | ||
1da177e4 LT |
1497 | /* |
1498 | * /sys/module/foo/sections stuff | |
1499 | * J. Corbet <corbet@lwn.net> | |
1500 | */ | |
8f6d0378 | 1501 | #ifdef CONFIG_SYSFS |
10b465aa | 1502 | |
8f6d0378 | 1503 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1504 | static inline bool sect_empty(const Elf_Shdr *sect) |
1505 | { | |
1506 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1507 | } | |
1508 | ||
6da0b565 | 1509 | struct module_sect_attr { |
a58730c4 RR |
1510 | struct module_attribute mattr; |
1511 | char *name; | |
1512 | unsigned long address; | |
1513 | }; | |
1514 | ||
6da0b565 | 1515 | struct module_sect_attrs { |
a58730c4 RR |
1516 | struct attribute_group grp; |
1517 | unsigned int nsections; | |
1518 | struct module_sect_attr attrs[0]; | |
1519 | }; | |
1520 | ||
1da177e4 | 1521 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1522 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1523 | { |
1524 | struct module_sect_attr *sattr = | |
1525 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1526 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1527 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1528 | } |
1529 | ||
04b1db9f IN |
1530 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1531 | { | |
a58730c4 | 1532 | unsigned int section; |
04b1db9f IN |
1533 | |
1534 | for (section = 0; section < sect_attrs->nsections; section++) | |
1535 | kfree(sect_attrs->attrs[section].name); | |
1536 | kfree(sect_attrs); | |
1537 | } | |
1538 | ||
8f6d0378 | 1539 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1540 | { |
1541 | unsigned int nloaded = 0, i, size[2]; | |
1542 | struct module_sect_attrs *sect_attrs; | |
1543 | struct module_sect_attr *sattr; | |
1544 | struct attribute **gattr; | |
22a8bdeb | 1545 | |
1da177e4 | 1546 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1547 | for (i = 0; i < info->hdr->e_shnum; i++) |
1548 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 | 1549 | nloaded++; |
8d1b73dd | 1550 | size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
1da177e4 LT |
1551 | sizeof(sect_attrs->grp.attrs[0])); |
1552 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1553 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1554 | if (sect_attrs == NULL) | |
1da177e4 LT |
1555 | return; |
1556 | ||
1557 | /* Setup section attributes. */ | |
1558 | sect_attrs->grp.name = "sections"; | |
1559 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1560 | ||
04b1db9f | 1561 | sect_attrs->nsections = 0; |
1da177e4 LT |
1562 | sattr = §_attrs->attrs[0]; |
1563 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1564 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1565 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1566 | if (sect_empty(sec)) | |
35dead42 | 1567 | continue; |
8f6d0378 RR |
1568 | sattr->address = sec->sh_addr; |
1569 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1570 | GFP_KERNEL); |
1571 | if (sattr->name == NULL) | |
1572 | goto out; | |
1573 | sect_attrs->nsections++; | |
361795b1 | 1574 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1575 | sattr->mattr.show = module_sect_show; |
1576 | sattr->mattr.store = NULL; | |
1577 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1578 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1579 | *(gattr++) = &(sattr++)->mattr.attr; |
1580 | } | |
1581 | *gattr = NULL; | |
1582 | ||
1583 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1584 | goto out; | |
1585 | ||
1586 | mod->sect_attrs = sect_attrs; | |
1587 | return; | |
1588 | out: | |
04b1db9f | 1589 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1590 | } |
1591 | ||
1592 | static void remove_sect_attrs(struct module *mod) | |
1593 | { | |
1594 | if (mod->sect_attrs) { | |
1595 | sysfs_remove_group(&mod->mkobj.kobj, | |
1596 | &mod->sect_attrs->grp); | |
1597 | /* We are positive that no one is using any sect attrs | |
1598 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1599 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1600 | mod->sect_attrs = NULL; |
1601 | } | |
1602 | } | |
1603 | ||
6d760133 RM |
1604 | /* |
1605 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1606 | */ | |
1607 | ||
1608 | struct module_notes_attrs { | |
1609 | struct kobject *dir; | |
1610 | unsigned int notes; | |
1611 | struct bin_attribute attrs[0]; | |
1612 | }; | |
1613 | ||
2c3c8bea | 1614 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1615 | struct bin_attribute *bin_attr, |
1616 | char *buf, loff_t pos, size_t count) | |
1617 | { | |
1618 | /* | |
1619 | * The caller checked the pos and count against our size. | |
1620 | */ | |
1621 | memcpy(buf, bin_attr->private + pos, count); | |
1622 | return count; | |
1623 | } | |
1624 | ||
1625 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1626 | unsigned int i) | |
1627 | { | |
1628 | if (notes_attrs->dir) { | |
1629 | while (i-- > 0) | |
1630 | sysfs_remove_bin_file(notes_attrs->dir, | |
1631 | ¬es_attrs->attrs[i]); | |
e9432093 | 1632 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1633 | } |
1634 | kfree(notes_attrs); | |
1635 | } | |
1636 | ||
8f6d0378 | 1637 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1638 | { |
1639 | unsigned int notes, loaded, i; | |
1640 | struct module_notes_attrs *notes_attrs; | |
1641 | struct bin_attribute *nattr; | |
1642 | ||
ea6bff36 IM |
1643 | /* failed to create section attributes, so can't create notes */ |
1644 | if (!mod->sect_attrs) | |
1645 | return; | |
1646 | ||
6d760133 RM |
1647 | /* Count notes sections and allocate structures. */ |
1648 | notes = 0; | |
8f6d0378 RR |
1649 | for (i = 0; i < info->hdr->e_shnum; i++) |
1650 | if (!sect_empty(&info->sechdrs[i]) && | |
1651 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1652 | ++notes; |
1653 | ||
1654 | if (notes == 0) | |
1655 | return; | |
1656 | ||
acafe7e3 | 1657 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1658 | GFP_KERNEL); |
1659 | if (notes_attrs == NULL) | |
1660 | return; | |
1661 | ||
1662 | notes_attrs->notes = notes; | |
1663 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1664 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1665 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1666 | continue; |
8f6d0378 | 1667 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1668 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1669 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1670 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1671 | nattr->size = info->sechdrs[i].sh_size; |
1672 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1673 | nattr->read = module_notes_read; |
1674 | ++nattr; | |
1675 | } | |
1676 | ++loaded; | |
1677 | } | |
1678 | ||
4ff6abff | 1679 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1680 | if (!notes_attrs->dir) |
1681 | goto out; | |
1682 | ||
1683 | for (i = 0; i < notes; ++i) | |
1684 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1685 | ¬es_attrs->attrs[i])) | |
1686 | goto out; | |
1687 | ||
1688 | mod->notes_attrs = notes_attrs; | |
1689 | return; | |
1690 | ||
1691 | out: | |
1692 | free_notes_attrs(notes_attrs, i); | |
1693 | } | |
1694 | ||
1695 | static void remove_notes_attrs(struct module *mod) | |
1696 | { | |
1697 | if (mod->notes_attrs) | |
1698 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1699 | } | |
1700 | ||
1da177e4 | 1701 | #else |
04b1db9f | 1702 | |
8f6d0378 RR |
1703 | static inline void add_sect_attrs(struct module *mod, |
1704 | const struct load_info *info) | |
1da177e4 LT |
1705 | { |
1706 | } | |
1707 | ||
1708 | static inline void remove_sect_attrs(struct module *mod) | |
1709 | { | |
1710 | } | |
6d760133 | 1711 | |
8f6d0378 RR |
1712 | static inline void add_notes_attrs(struct module *mod, |
1713 | const struct load_info *info) | |
6d760133 RM |
1714 | { |
1715 | } | |
1716 | ||
1717 | static inline void remove_notes_attrs(struct module *mod) | |
1718 | { | |
1719 | } | |
8f6d0378 | 1720 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1721 | |
1ba5c08b | 1722 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1723 | { |
1724 | #ifdef CONFIG_MODULE_UNLOAD | |
1725 | struct module_use *use; | |
80a3d1bb | 1726 | |
75676500 | 1727 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1728 | list_for_each_entry(use, &mod->target_list, target_list) |
1729 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1730 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1731 | #endif |
1732 | } | |
1733 | ||
1ba5c08b | 1734 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1735 | { |
1ba5c08b | 1736 | int ret = 0; |
80a3d1bb RR |
1737 | #ifdef CONFIG_MODULE_UNLOAD |
1738 | struct module_use *use; | |
1739 | ||
75676500 | 1740 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1741 | list_for_each_entry(use, &mod->target_list, target_list) { |
1742 | ret = sysfs_create_link(use->target->holders_dir, | |
1743 | &mod->mkobj.kobj, mod->name); | |
1744 | if (ret) | |
1745 | break; | |
1746 | } | |
75676500 | 1747 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1748 | if (ret) |
1749 | del_usage_links(mod); | |
80a3d1bb | 1750 | #endif |
1ba5c08b | 1751 | return ret; |
80a3d1bb RR |
1752 | } |
1753 | ||
bc6f2a75 Y |
1754 | static void module_remove_modinfo_attrs(struct module *mod, int end); |
1755 | ||
6407ebb2 | 1756 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1757 | { |
1758 | struct module_attribute *attr; | |
03e88ae1 | 1759 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1760 | int error = 0; |
1761 | int i; | |
1762 | ||
03e88ae1 GKH |
1763 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1764 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1765 | GFP_KERNEL); | |
1766 | if (!mod->modinfo_attrs) | |
1767 | return -ENOMEM; | |
1768 | ||
1769 | temp_attr = mod->modinfo_attrs; | |
bc6f2a75 | 1770 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
c75b590d | 1771 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1772 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1773 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1774 | error = sysfs_create_file(&mod->mkobj.kobj, |
1775 | &temp_attr->attr); | |
bc6f2a75 Y |
1776 | if (error) |
1777 | goto error_out; | |
03e88ae1 GKH |
1778 | ++temp_attr; |
1779 | } | |
c988d2b2 | 1780 | } |
bc6f2a75 Y |
1781 | |
1782 | return 0; | |
1783 | ||
1784 | error_out: | |
1785 | if (i > 0) | |
1786 | module_remove_modinfo_attrs(mod, --i); | |
635dac08 Y |
1787 | else |
1788 | kfree(mod->modinfo_attrs); | |
c988d2b2 MD |
1789 | return error; |
1790 | } | |
1791 | ||
bc6f2a75 | 1792 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
c988d2b2 MD |
1793 | { |
1794 | struct module_attribute *attr; | |
1795 | int i; | |
1796 | ||
03e88ae1 | 1797 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
bc6f2a75 Y |
1798 | if (end >= 0 && i > end) |
1799 | break; | |
03e88ae1 GKH |
1800 | /* pick a field to test for end of list */ |
1801 | if (!attr->attr.name) | |
1802 | break; | |
6da0b565 | 1803 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1804 | if (attr->free) |
1805 | attr->free(mod); | |
c988d2b2 | 1806 | } |
03e88ae1 | 1807 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1808 | } |
1da177e4 | 1809 | |
942e4431 LZ |
1810 | static void mod_kobject_put(struct module *mod) |
1811 | { | |
1812 | DECLARE_COMPLETION_ONSTACK(c); | |
1813 | mod->mkobj.kobj_completion = &c; | |
1814 | kobject_put(&mod->mkobj.kobj); | |
1815 | wait_for_completion(&c); | |
1816 | } | |
1817 | ||
6407ebb2 | 1818 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1819 | { |
1820 | int err; | |
6494a93d | 1821 | struct kobject *kobj; |
1da177e4 | 1822 | |
823bccfc | 1823 | if (!module_sysfs_initialized) { |
bddb12b3 | 1824 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1825 | err = -EINVAL; |
1826 | goto out; | |
1827 | } | |
6494a93d GKH |
1828 | |
1829 | kobj = kset_find_obj(module_kset, mod->name); | |
1830 | if (kobj) { | |
bddb12b3 | 1831 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1832 | kobject_put(kobj); |
1833 | err = -EINVAL; | |
1834 | goto out; | |
1835 | } | |
1836 | ||
1da177e4 | 1837 | mod->mkobj.mod = mod; |
e17e0f51 | 1838 | |
ac3c8141 GKH |
1839 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1840 | mod->mkobj.kobj.kset = module_kset; | |
1841 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1842 | "%s", mod->name); | |
1843 | if (err) | |
942e4431 | 1844 | mod_kobject_put(mod); |
270a6c4c | 1845 | |
97c146ef | 1846 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1847 | out: |
1848 | return err; | |
1849 | } | |
1850 | ||
6407ebb2 | 1851 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1852 | const struct load_info *info, |
270a6c4c KS |
1853 | struct kernel_param *kparam, |
1854 | unsigned int num_params) | |
1855 | { | |
1856 | int err; | |
1857 | ||
80a3d1bb RR |
1858 | err = mod_sysfs_init(mod); |
1859 | if (err) | |
1860 | goto out; | |
1861 | ||
4ff6abff | 1862 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1863 | if (!mod->holders_dir) { |
1864 | err = -ENOMEM; | |
270a6c4c | 1865 | goto out_unreg; |
240936e1 | 1866 | } |
270a6c4c | 1867 | |
1da177e4 LT |
1868 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1869 | if (err) | |
270a6c4c | 1870 | goto out_unreg_holders; |
1da177e4 | 1871 | |
c988d2b2 MD |
1872 | err = module_add_modinfo_attrs(mod); |
1873 | if (err) | |
e17e0f51 | 1874 | goto out_unreg_param; |
c988d2b2 | 1875 | |
1ba5c08b CL |
1876 | err = add_usage_links(mod); |
1877 | if (err) | |
1878 | goto out_unreg_modinfo_attrs; | |
1879 | ||
8f6d0378 RR |
1880 | add_sect_attrs(mod, info); |
1881 | add_notes_attrs(mod, info); | |
80a3d1bb | 1882 | |
e17e0f51 | 1883 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1884 | return 0; |
1885 | ||
1ba5c08b | 1886 | out_unreg_modinfo_attrs: |
bc6f2a75 | 1887 | module_remove_modinfo_attrs(mod, -1); |
e17e0f51 KS |
1888 | out_unreg_param: |
1889 | module_param_sysfs_remove(mod); | |
270a6c4c | 1890 | out_unreg_holders: |
78a2d906 | 1891 | kobject_put(mod->holders_dir); |
270a6c4c | 1892 | out_unreg: |
942e4431 | 1893 | mod_kobject_put(mod); |
80a3d1bb | 1894 | out: |
1da177e4 LT |
1895 | return err; |
1896 | } | |
34e4e2fe DL |
1897 | |
1898 | static void mod_sysfs_fini(struct module *mod) | |
1899 | { | |
8f6d0378 RR |
1900 | remove_notes_attrs(mod); |
1901 | remove_sect_attrs(mod); | |
942e4431 | 1902 | mod_kobject_put(mod); |
34e4e2fe DL |
1903 | } |
1904 | ||
cf2fde7b RR |
1905 | static void init_param_lock(struct module *mod) |
1906 | { | |
1907 | mutex_init(&mod->param_lock); | |
1908 | } | |
8f6d0378 | 1909 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1910 | |
8f6d0378 RR |
1911 | static int mod_sysfs_setup(struct module *mod, |
1912 | const struct load_info *info, | |
6407ebb2 RR |
1913 | struct kernel_param *kparam, |
1914 | unsigned int num_params) | |
1915 | { | |
1916 | return 0; | |
1917 | } | |
1918 | ||
34e4e2fe DL |
1919 | static void mod_sysfs_fini(struct module *mod) |
1920 | { | |
1921 | } | |
1922 | ||
bc6f2a75 | 1923 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
36b0360d RR |
1924 | { |
1925 | } | |
1926 | ||
80a3d1bb RR |
1927 | static void del_usage_links(struct module *mod) |
1928 | { | |
1929 | } | |
1930 | ||
cf2fde7b RR |
1931 | static void init_param_lock(struct module *mod) |
1932 | { | |
1933 | } | |
34e4e2fe | 1934 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1935 | |
36b0360d | 1936 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1937 | { |
80a3d1bb | 1938 | del_usage_links(mod); |
bc6f2a75 | 1939 | module_remove_modinfo_attrs(mod, -1); |
1da177e4 | 1940 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1941 | kobject_put(mod->mkobj.drivers_dir); |
1942 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1943 | mod_sysfs_fini(mod); |
1da177e4 LT |
1944 | } |
1945 | ||
93651f80 | 1946 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb MC |
1947 | /* |
1948 | * LKM RO/NX protection: protect module's text/ro-data | |
1949 | * from modification and any data from execution. | |
85c898db RR |
1950 | * |
1951 | * General layout of module is: | |
444d13ff JY |
1952 | * [text] [read-only-data] [ro-after-init] [writable data] |
1953 | * text_size -----^ ^ ^ ^ | |
1954 | * ro_size ------------------------| | | | |
1955 | * ro_after_init_size -----------------------------| | | |
1956 | * size -----------------------------------------------------------| | |
85c898db RR |
1957 | * |
1958 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1959 | */ |
85c898db RR |
1960 | static void frob_text(const struct module_layout *layout, |
1961 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1962 | { |
85c898db RR |
1963 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1964 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1965 | set_memory((unsigned long)layout->base, | |
1966 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1967 | } |
84e1c6bb | 1968 | |
93651f80 | 1969 | #ifdef CONFIG_STRICT_MODULE_RWX |
85c898db RR |
1970 | static void frob_rodata(const struct module_layout *layout, |
1971 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1972 | { |
85c898db RR |
1973 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1974 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1975 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1976 | set_memory((unsigned long)layout->base + layout->text_size, | |
1977 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1978 | } |
1979 | ||
444d13ff JY |
1980 | static void frob_ro_after_init(const struct module_layout *layout, |
1981 | int (*set_memory)(unsigned long start, int num_pages)) | |
1982 | { | |
1983 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1984 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1985 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1986 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1987 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1988 | } | |
1989 | ||
85c898db RR |
1990 | static void frob_writable_data(const struct module_layout *layout, |
1991 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1992 | { |
85c898db | 1993 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1994 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1995 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1996 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1997 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1998 | } |
84e1c6bb | 1999 | |
85c898db RR |
2000 | /* livepatching wants to disable read-only so it can frob module. */ |
2001 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 2002 | { |
39290b38 AT |
2003 | if (!rodata_enabled) |
2004 | return; | |
2005 | ||
85c898db RR |
2006 | frob_text(&mod->core_layout, set_memory_rw); |
2007 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 2008 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
2009 | frob_text(&mod->init_layout, set_memory_rw); |
2010 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 2011 | } |
84e1c6bb | 2012 | |
444d13ff | 2013 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 2014 | { |
39290b38 AT |
2015 | if (!rodata_enabled) |
2016 | return; | |
2017 | ||
1a7b7d92 RE |
2018 | set_vm_flush_reset_perms(mod->core_layout.base); |
2019 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 2020 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 2021 | |
85c898db RR |
2022 | frob_rodata(&mod->core_layout, set_memory_ro); |
2023 | frob_text(&mod->init_layout, set_memory_ro); | |
2024 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
2025 | |
2026 | if (after_init) | |
2027 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
2028 | } |
2029 | ||
85c898db | 2030 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 2031 | { |
85c898db | 2032 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 2033 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
2034 | frob_writable_data(&mod->core_layout, set_memory_nx); |
2035 | frob_rodata(&mod->init_layout, set_memory_nx); | |
2036 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
2037 | } |
2038 | ||
84e1c6bb | 2039 | /* Iterate through all modules and set each module's text as RW */ |
5d05c708 | 2040 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
2041 | { |
2042 | struct module *mod; | |
2043 | ||
39290b38 AT |
2044 | if (!rodata_enabled) |
2045 | return; | |
2046 | ||
84e1c6bb MC |
2047 | mutex_lock(&module_mutex); |
2048 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
2049 | if (mod->state == MODULE_STATE_UNFORMED) |
2050 | continue; | |
85c898db RR |
2051 | |
2052 | frob_text(&mod->core_layout, set_memory_rw); | |
2053 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb MC |
2054 | } |
2055 | mutex_unlock(&module_mutex); | |
2056 | } | |
2057 | ||
2058 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 2059 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
2060 | { |
2061 | struct module *mod; | |
2062 | ||
39290b38 AT |
2063 | if (!rodata_enabled) |
2064 | return; | |
2065 | ||
84e1c6bb MC |
2066 | mutex_lock(&module_mutex); |
2067 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
2068 | /* |
2069 | * Ignore going modules since it's possible that ro | |
2070 | * protection has already been disabled, otherwise we'll | |
2071 | * run into protection faults at module deallocation. | |
2072 | */ | |
2073 | if (mod->state == MODULE_STATE_UNFORMED || | |
2074 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 2075 | continue; |
85c898db RR |
2076 | |
2077 | frob_text(&mod->core_layout, set_memory_ro); | |
2078 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb MC |
2079 | } |
2080 | mutex_unlock(&module_mutex); | |
2081 | } | |
93651f80 | 2082 | #else /* !CONFIG_STRICT_MODULE_RWX */ |
85c898db | 2083 | static void module_enable_nx(const struct module *mod) { } |
93651f80 | 2084 | #endif /* CONFIG_STRICT_MODULE_RWX */ |
2eef1399 YY |
2085 | static void module_enable_x(const struct module *mod) |
2086 | { | |
2087 | frob_text(&mod->core_layout, set_memory_x); | |
2088 | frob_text(&mod->init_layout, set_memory_x); | |
2089 | } | |
93651f80 YY |
2090 | #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ |
2091 | static void module_enable_nx(const struct module *mod) { } | |
2092 | static void module_enable_x(const struct module *mod) { } | |
2093 | #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
2094 | ||
84e1c6bb | 2095 | |
1ce15ef4 JY |
2096 | #ifdef CONFIG_LIVEPATCH |
2097 | /* | |
2098 | * Persist Elf information about a module. Copy the Elf header, | |
2099 | * section header table, section string table, and symtab section | |
2100 | * index from info to mod->klp_info. | |
2101 | */ | |
2102 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2103 | { | |
2104 | unsigned int size, symndx; | |
2105 | int ret; | |
2106 | ||
2107 | size = sizeof(*mod->klp_info); | |
2108 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2109 | if (mod->klp_info == NULL) | |
2110 | return -ENOMEM; | |
2111 | ||
2112 | /* Elf header */ | |
2113 | size = sizeof(mod->klp_info->hdr); | |
2114 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2115 | ||
2116 | /* Elf section header table */ | |
2117 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2118 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2119 | if (mod->klp_info->sechdrs == NULL) { |
2120 | ret = -ENOMEM; | |
2121 | goto free_info; | |
2122 | } | |
1ce15ef4 JY |
2123 | |
2124 | /* Elf section name string table */ | |
2125 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2126 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2127 | if (mod->klp_info->secstrings == NULL) { |
2128 | ret = -ENOMEM; | |
2129 | goto free_sechdrs; | |
2130 | } | |
1ce15ef4 JY |
2131 | |
2132 | /* Elf symbol section index */ | |
2133 | symndx = info->index.sym; | |
2134 | mod->klp_info->symndx = symndx; | |
2135 | ||
2136 | /* | |
2137 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2138 | * copy of the original symbol table. Adjust sh_addr to point | |
2139 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2140 | * init memory is freed at the end of do_init_module(). | |
2141 | */ | |
2142 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2143 | (unsigned long) mod->core_kallsyms.symtab; | |
2144 | ||
2145 | return 0; | |
2146 | ||
2147 | free_sechdrs: | |
2148 | kfree(mod->klp_info->sechdrs); | |
2149 | free_info: | |
2150 | kfree(mod->klp_info); | |
2151 | return ret; | |
2152 | } | |
2153 | ||
2154 | static void free_module_elf(struct module *mod) | |
2155 | { | |
2156 | kfree(mod->klp_info->sechdrs); | |
2157 | kfree(mod->klp_info->secstrings); | |
2158 | kfree(mod->klp_info); | |
2159 | } | |
2160 | #else /* !CONFIG_LIVEPATCH */ | |
2161 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2162 | { | |
2163 | return 0; | |
2164 | } | |
2165 | ||
2166 | static void free_module_elf(struct module *mod) | |
2167 | { | |
2168 | } | |
2169 | #endif /* CONFIG_LIVEPATCH */ | |
2170 | ||
be1f221c | 2171 | void __weak module_memfree(void *module_region) |
74e08fcf | 2172 | { |
1a7b7d92 RE |
2173 | /* |
2174 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2175 | * supported by vmalloc. | |
2176 | */ | |
2177 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2178 | vfree(module_region); |
2179 | } | |
2180 | ||
2181 | void __weak module_arch_cleanup(struct module *mod) | |
2182 | { | |
2183 | } | |
2184 | ||
d453cded RR |
2185 | void __weak module_arch_freeing_init(struct module *mod) |
2186 | { | |
2187 | } | |
2188 | ||
75676500 | 2189 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2190 | static void free_module(struct module *mod) |
2191 | { | |
7ead8b83 LZ |
2192 | trace_module_free(mod); |
2193 | ||
36b0360d | 2194 | mod_sysfs_teardown(mod); |
1da177e4 | 2195 | |
944a1fa0 RR |
2196 | /* We leave it in list to prevent duplicate loads, but make sure |
2197 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2198 | mutex_lock(&module_mutex); |
944a1fa0 | 2199 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2200 | mutex_unlock(&module_mutex); |
944a1fa0 | 2201 | |
b82bab4b JB |
2202 | /* Remove dynamic debug info */ |
2203 | ddebug_remove_module(mod->name); | |
2204 | ||
1da177e4 LT |
2205 | /* Arch-specific cleanup. */ |
2206 | module_arch_cleanup(mod); | |
2207 | ||
2208 | /* Module unload stuff */ | |
2209 | module_unload_free(mod); | |
2210 | ||
e180a6b7 RR |
2211 | /* Free any allocated parameters. */ |
2212 | destroy_params(mod->kp, mod->num_kp); | |
2213 | ||
1ce15ef4 JY |
2214 | if (is_livepatch_module(mod)) |
2215 | free_module_elf(mod); | |
2216 | ||
944a1fa0 RR |
2217 | /* Now we can delete it from the lists */ |
2218 | mutex_lock(&module_mutex); | |
461e34ae MH |
2219 | /* Unlink carefully: kallsyms could be walking list. */ |
2220 | list_del_rcu(&mod->list); | |
93c2e105 | 2221 | mod_tree_remove(mod); |
0286b5ea | 2222 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2223 | module_bug_cleanup(mod); |
0be964be | 2224 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2225 | synchronize_rcu(); |
944a1fa0 RR |
2226 | mutex_unlock(&module_mutex); |
2227 | ||
85c898db | 2228 | /* This may be empty, but that's OK */ |
d453cded | 2229 | module_arch_freeing_init(mod); |
7523e4dc | 2230 | module_memfree(mod->init_layout.base); |
1da177e4 | 2231 | kfree(mod->args); |
259354de | 2232 | percpu_modfree(mod); |
9f85a4bb | 2233 | |
35a9393c | 2234 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2235 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2236 | |
1da177e4 | 2237 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2238 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2239 | } |
2240 | ||
2241 | void *__symbol_get(const char *symbol) | |
2242 | { | |
2243 | struct module *owner; | |
414fd31b | 2244 | const struct kernel_symbol *sym; |
1da177e4 | 2245 | |
24da1cbf | 2246 | preempt_disable(); |
414fd31b TA |
2247 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2248 | if (sym && strong_try_module_get(owner)) | |
2249 | sym = NULL; | |
24da1cbf | 2250 | preempt_enable(); |
1da177e4 | 2251 | |
7290d580 | 2252 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2253 | } |
2254 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2255 | ||
eea8b54d AN |
2256 | /* |
2257 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2258 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2259 | * |
2260 | * You must hold the module_mutex. | |
eea8b54d | 2261 | */ |
2d25bc55 | 2262 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2263 | { |
b211104d | 2264 | unsigned int i; |
eea8b54d | 2265 | struct module *owner; |
b211104d RR |
2266 | const struct kernel_symbol *s; |
2267 | struct { | |
2268 | const struct kernel_symbol *sym; | |
2269 | unsigned int num; | |
2270 | } arr[] = { | |
2271 | { mod->syms, mod->num_syms }, | |
2272 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2273 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2274 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2275 | { mod->unused_syms, mod->num_unused_syms }, |
2276 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2277 | #endif |
b211104d | 2278 | }; |
eea8b54d | 2279 | |
b211104d RR |
2280 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2281 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 AB |
2282 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
2283 | true, false)) { | |
bddb12b3 | 2284 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2285 | " (owned by %s)\n", |
7290d580 AB |
2286 | mod->name, kernel_symbol_name(s), |
2287 | module_name(owner)); | |
b211104d RR |
2288 | return -ENOEXEC; |
2289 | } | |
eea8b54d | 2290 | } |
b211104d RR |
2291 | } |
2292 | return 0; | |
eea8b54d AN |
2293 | } |
2294 | ||
9a4b9708 | 2295 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2296 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2297 | { | |
2298 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2299 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2300 | unsigned long secbase; |
49668688 | 2301 | unsigned int i; |
1da177e4 | 2302 | int ret = 0; |
414fd31b | 2303 | const struct kernel_symbol *ksym; |
1da177e4 | 2304 | |
49668688 RR |
2305 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2306 | const char *name = info->strtab + sym[i].st_name; | |
2307 | ||
1da177e4 LT |
2308 | switch (sym[i].st_shndx) { |
2309 | case SHN_COMMON: | |
80375980 JM |
2310 | /* Ignore common symbols */ |
2311 | if (!strncmp(name, "__gnu_lto", 9)) | |
2312 | break; | |
2313 | ||
1da177e4 LT |
2314 | /* We compiled with -fno-common. These are not |
2315 | supposed to happen. */ | |
5e124169 | 2316 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2317 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2318 | mod->name); |
2319 | ret = -ENOEXEC; | |
2320 | break; | |
2321 | ||
2322 | case SHN_ABS: | |
2323 | /* Don't need to do anything */ | |
5e124169 | 2324 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2325 | (long)sym[i].st_value); |
2326 | break; | |
2327 | ||
1ce15ef4 JY |
2328 | case SHN_LIVEPATCH: |
2329 | /* Livepatch symbols are resolved by livepatch */ | |
2330 | break; | |
2331 | ||
1da177e4 | 2332 | case SHN_UNDEF: |
49668688 | 2333 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2334 | /* Ok if resolved. */ |
9bea7f23 | 2335 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2336 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2337 | break; |
414fd31b TA |
2338 | } |
2339 | ||
1da177e4 | 2340 | /* Ok if weak. */ |
9bea7f23 | 2341 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2342 | break; |
2343 | ||
9bea7f23 | 2344 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2345 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2346 | mod->name, name, ret); | |
1da177e4 LT |
2347 | break; |
2348 | ||
2349 | default: | |
2350 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2351 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2352 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2353 | else |
49668688 | 2354 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2355 | sym[i].st_value += secbase; |
2356 | break; | |
2357 | } | |
2358 | } | |
2359 | ||
2360 | return ret; | |
2361 | } | |
2362 | ||
49668688 | 2363 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2364 | { |
2365 | unsigned int i; | |
2366 | int err = 0; | |
2367 | ||
2368 | /* Now do relocations. */ | |
49668688 RR |
2369 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2370 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2371 | |
2372 | /* Not a valid relocation section? */ | |
49668688 | 2373 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2374 | continue; |
2375 | ||
2376 | /* Don't bother with non-allocated sections */ | |
49668688 | 2377 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2378 | continue; |
2379 | ||
1ce15ef4 JY |
2380 | /* Livepatch relocation sections are applied by livepatch */ |
2381 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2382 | continue; | |
2383 | ||
49668688 RR |
2384 | if (info->sechdrs[i].sh_type == SHT_REL) |
2385 | err = apply_relocate(info->sechdrs, info->strtab, | |
2386 | info->index.sym, i, mod); | |
2387 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2388 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2389 | info->index.sym, i, mod); | |
22e268eb RR |
2390 | if (err < 0) |
2391 | break; | |
2392 | } | |
2393 | return err; | |
2394 | } | |
2395 | ||
088af9a6 HD |
2396 | /* Additional bytes needed by arch in front of individual sections */ |
2397 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2398 | unsigned int section) | |
2399 | { | |
2400 | /* default implementation just returns zero */ | |
2401 | return 0; | |
2402 | } | |
2403 | ||
1da177e4 | 2404 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2405 | static long get_offset(struct module *mod, unsigned int *size, |
2406 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2407 | { |
2408 | long ret; | |
2409 | ||
088af9a6 | 2410 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2411 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2412 | *size = ret + sechdr->sh_size; | |
2413 | return ret; | |
2414 | } | |
2415 | ||
2416 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2417 | might -- code, read-only data, read-write data, small data. Tally | |
2418 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2419 | belongs in init. */ | |
49668688 | 2420 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2421 | { |
2422 | static unsigned long const masks[][2] = { | |
2423 | /* NOTE: all executable code must be the first section | |
2424 | * in this array; otherwise modify the text_size | |
2425 | * finder in the two loops below */ | |
2426 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2427 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2428 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2429 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2430 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2431 | }; | |
2432 | unsigned int m, i; | |
2433 | ||
49668688 RR |
2434 | for (i = 0; i < info->hdr->e_shnum; i++) |
2435 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2436 | |
5e124169 | 2437 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2438 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2439 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2440 | Elf_Shdr *s = &info->sechdrs[i]; | |
2441 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2442 | |
2443 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2444 | || (s->sh_flags & masks[m][1]) | |
2445 | || s->sh_entsize != ~0UL | |
49668688 | 2446 | || strstarts(sname, ".init")) |
1da177e4 | 2447 | continue; |
7523e4dc | 2448 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2449 | pr_debug("\t%s\n", sname); |
1da177e4 | 2450 | } |
84e1c6bb MC |
2451 | switch (m) { |
2452 | case 0: /* executable */ | |
7523e4dc RR |
2453 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2454 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2455 | break; |
2456 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2457 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2458 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2459 | break; |
444d13ff JY |
2460 | case 2: /* RO after init */ |
2461 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2462 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2463 | break; | |
2464 | case 4: /* whole core */ | |
7523e4dc | 2465 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2466 | break; |
2467 | } | |
1da177e4 LT |
2468 | } |
2469 | ||
5e124169 | 2470 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2471 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2472 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2473 | Elf_Shdr *s = &info->sechdrs[i]; | |
2474 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2475 | |
2476 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2477 | || (s->sh_flags & masks[m][1]) | |
2478 | || s->sh_entsize != ~0UL | |
49668688 | 2479 | || !strstarts(sname, ".init")) |
1da177e4 | 2480 | continue; |
7523e4dc | 2481 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2482 | | INIT_OFFSET_MASK); |
5e124169 | 2483 | pr_debug("\t%s\n", sname); |
1da177e4 | 2484 | } |
84e1c6bb MC |
2485 | switch (m) { |
2486 | case 0: /* executable */ | |
7523e4dc RR |
2487 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2488 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2489 | break; |
2490 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2491 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2492 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2493 | break; |
444d13ff JY |
2494 | case 2: |
2495 | /* | |
2496 | * RO after init doesn't apply to init_layout (only | |
2497 | * core_layout), so it just takes the value of ro_size. | |
2498 | */ | |
2499 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2500 | break; | |
2501 | case 4: /* whole init */ | |
7523e4dc | 2502 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2503 | break; |
2504 | } | |
1da177e4 LT |
2505 | } |
2506 | } | |
2507 | ||
1da177e4 LT |
2508 | static void set_license(struct module *mod, const char *license) |
2509 | { | |
2510 | if (!license) | |
2511 | license = "unspecified"; | |
2512 | ||
fa3ba2e8 | 2513 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2514 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2515 | pr_warn("%s: module license '%s' taints kernel.\n", |
2516 | mod->name, license); | |
373d4d09 RR |
2517 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2518 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2519 | } |
2520 | } | |
2521 | ||
2522 | /* Parse tag=value strings from .modinfo section */ | |
2523 | static char *next_string(char *string, unsigned long *secsize) | |
2524 | { | |
2525 | /* Skip non-zero chars */ | |
2526 | while (string[0]) { | |
2527 | string++; | |
2528 | if ((*secsize)-- <= 1) | |
2529 | return NULL; | |
2530 | } | |
2531 | ||
2532 | /* Skip any zero padding. */ | |
2533 | while (!string[0]) { | |
2534 | string++; | |
2535 | if ((*secsize)-- <= 1) | |
2536 | return NULL; | |
2537 | } | |
2538 | return string; | |
2539 | } | |
2540 | ||
c5e4a062 MM |
2541 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
2542 | char *prev) | |
1da177e4 LT |
2543 | { |
2544 | char *p; | |
2545 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2546 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2547 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2548 | |
5fdc7db6 JY |
2549 | /* |
2550 | * get_modinfo() calls made before rewrite_section_headers() | |
2551 | * must use sh_offset, as sh_addr isn't set! | |
2552 | */ | |
c5e4a062 MM |
2553 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
2554 | ||
2555 | if (prev) { | |
2556 | size -= prev - modinfo; | |
2557 | modinfo = next_string(prev, &size); | |
2558 | } | |
2559 | ||
2560 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2561 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2562 | return p + taglen + 1; | |
2563 | } | |
2564 | return NULL; | |
2565 | } | |
2566 | ||
c5e4a062 MM |
2567 | static char *get_modinfo(const struct load_info *info, const char *tag) |
2568 | { | |
2569 | return get_next_modinfo(info, tag, NULL); | |
2570 | } | |
2571 | ||
49668688 | 2572 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2573 | { |
2574 | struct module_attribute *attr; | |
2575 | int i; | |
2576 | ||
2577 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2578 | if (attr->setup) | |
49668688 | 2579 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2580 | } |
2581 | } | |
c988d2b2 | 2582 | |
a263f776 RR |
2583 | static void free_modinfo(struct module *mod) |
2584 | { | |
2585 | struct module_attribute *attr; | |
2586 | int i; | |
2587 | ||
2588 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2589 | if (attr->free) | |
2590 | attr->free(mod); | |
2591 | } | |
2592 | } | |
2593 | ||
1da177e4 | 2594 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2595 | |
2d25bc55 JY |
2596 | /* Lookup exported symbol in given range of kernel_symbols */ |
2597 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2598 | const struct kernel_symbol *start, | |
2599 | const struct kernel_symbol *stop) | |
15bba37d | 2600 | { |
9d63487f AIB |
2601 | return bsearch(name, start, stop - start, |
2602 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2603 | } |
2604 | ||
ca4787b7 TA |
2605 | static int is_exported(const char *name, unsigned long value, |
2606 | const struct module *mod) | |
1da177e4 | 2607 | { |
ca4787b7 TA |
2608 | const struct kernel_symbol *ks; |
2609 | if (!mod) | |
2d25bc55 | 2610 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2611 | else |
2d25bc55 JY |
2612 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2613 | ||
7290d580 | 2614 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2615 | } |
2616 | ||
2617 | /* As per nm */ | |
eded41c1 | 2618 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2619 | { |
eded41c1 RR |
2620 | const Elf_Shdr *sechdrs = info->sechdrs; |
2621 | ||
1da177e4 LT |
2622 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2623 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2624 | return 'v'; | |
2625 | else | |
2626 | return 'w'; | |
2627 | } | |
2628 | if (sym->st_shndx == SHN_UNDEF) | |
2629 | return 'U'; | |
e0224418 | 2630 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2631 | return 'a'; |
2632 | if (sym->st_shndx >= SHN_LORESERVE) | |
2633 | return '?'; | |
2634 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2635 | return 't'; | |
2636 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2637 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2638 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2639 | return 'r'; | |
2640 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2641 | return 'g'; | |
2642 | else | |
2643 | return 'd'; | |
2644 | } | |
2645 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2646 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2647 | return 's'; | |
2648 | else | |
2649 | return 'b'; | |
2650 | } | |
eded41c1 RR |
2651 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2652 | ".debug")) { | |
1da177e4 | 2653 | return 'n'; |
eded41c1 | 2654 | } |
1da177e4 LT |
2655 | return '?'; |
2656 | } | |
2657 | ||
4a496226 | 2658 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2659 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2660 | { |
2661 | const Elf_Shdr *sec; | |
2662 | ||
2663 | if (src->st_shndx == SHN_UNDEF | |
2664 | || src->st_shndx >= shnum | |
2665 | || !src->st_name) | |
2666 | return false; | |
2667 | ||
e0224418 MB |
2668 | #ifdef CONFIG_KALLSYMS_ALL |
2669 | if (src->st_shndx == pcpundx) | |
2670 | return true; | |
2671 | #endif | |
2672 | ||
4a496226 JB |
2673 | sec = sechdrs + src->st_shndx; |
2674 | if (!(sec->sh_flags & SHF_ALLOC) | |
2675 | #ifndef CONFIG_KALLSYMS_ALL | |
2676 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2677 | #endif | |
2678 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2679 | return false; | |
2680 | ||
2681 | return true; | |
2682 | } | |
2683 | ||
48fd1188 KC |
2684 | /* |
2685 | * We only allocate and copy the strings needed by the parts of symtab | |
2686 | * we keep. This is simple, but has the effect of making multiple | |
2687 | * copies of duplicates. We could be more sophisticated, see | |
2688 | * linux-kernel thread starting with | |
2689 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2690 | */ | |
49668688 | 2691 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2692 | { |
49668688 RR |
2693 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2694 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2695 | const Elf_Sym *src; |
54523ec7 | 2696 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2697 | |
2698 | /* Put symbol section at end of init part of module. */ | |
2699 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2700 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2701 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2702 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2703 | |
49668688 | 2704 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2705 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2706 | |
48fd1188 | 2707 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2708 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2709 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2710 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2711 | info->index.pcpu)) { | |
59ef28b1 | 2712 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2713 | ndst++; |
554bdfe5 | 2714 | } |
59ef28b1 | 2715 | } |
4a496226 JB |
2716 | |
2717 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2718 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2719 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2720 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2721 | info->core_typeoffs = mod->core_layout.size; |
2722 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2723 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2724 | |
554bdfe5 JB |
2725 | /* Put string table section at end of init part of module. */ |
2726 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2727 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2728 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2729 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2730 | |
2731 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2732 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2733 | __alignof__(struct mod_kallsyms)); | |
2734 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2735 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2736 | info->init_typeoffs = mod->init_layout.size; |
2737 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2738 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2739 | } |
2740 | ||
8244062e RR |
2741 | /* |
2742 | * We use the full symtab and strtab which layout_symtab arranged to | |
2743 | * be appended to the init section. Later we switch to the cut-down | |
2744 | * core-only ones. | |
2745 | */ | |
811d66a0 | 2746 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2747 | { |
4a496226 JB |
2748 | unsigned int i, ndst; |
2749 | const Elf_Sym *src; | |
2750 | Elf_Sym *dst; | |
554bdfe5 | 2751 | char *s; |
eded41c1 | 2752 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2753 | |
8244062e RR |
2754 | /* Set up to point into init section. */ |
2755 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2756 | ||
2757 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2758 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2759 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2760 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2761 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2762 | |
1c7651f4 EL |
2763 | /* |
2764 | * Now populate the cut down core kallsyms for after init | |
2765 | * and set types up while we still have access to sections. | |
2766 | */ | |
8244062e RR |
2767 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2768 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2769 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2770 | src = mod->kallsyms->symtab; |
2771 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2772 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2773 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2774 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2775 | info->index.pcpu)) { | |
1c7651f4 EL |
2776 | mod->core_kallsyms.typetab[ndst] = |
2777 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2778 | dst[ndst] = src[i]; |
8244062e RR |
2779 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2780 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2781 | KSYM_NAME_LEN) + 1; |
2782 | } | |
4a496226 | 2783 | } |
8244062e | 2784 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2785 | } |
2786 | #else | |
49668688 | 2787 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2788 | { |
2789 | } | |
3ae91c21 | 2790 | |
abbce906 | 2791 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2792 | { |
2793 | } | |
2794 | #endif /* CONFIG_KALLSYMS */ | |
2795 | ||
52796312 | 2796 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2797 | { |
811d66a0 RR |
2798 | if (!debug) |
2799 | return; | |
513770f5 | 2800 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2801 | } |
346e15be | 2802 | |
52796312 | 2803 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2804 | { |
2805 | if (debug) | |
52796312 | 2806 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2807 | } |
2808 | ||
74e08fcf JB |
2809 | void * __weak module_alloc(unsigned long size) |
2810 | { | |
82fab442 | 2811 | return vmalloc_exec(size); |
74e08fcf JB |
2812 | } |
2813 | ||
38b37d63 MS |
2814 | bool __weak module_exit_section(const char *name) |
2815 | { | |
2816 | return strstarts(name, ".exit"); | |
2817 | } | |
2818 | ||
4f2294b6 | 2819 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2820 | static void kmemleak_load_module(const struct module *mod, |
2821 | const struct load_info *info) | |
4f2294b6 CM |
2822 | { |
2823 | unsigned int i; | |
2824 | ||
2825 | /* only scan the sections containing data */ | |
c017b4be | 2826 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2827 | |
49668688 | 2828 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2829 | /* Scan all writable sections that's not executable */ |
2830 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2831 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2832 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2833 | continue; |
2834 | ||
49668688 RR |
2835 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2836 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2837 | } |
2838 | } | |
2839 | #else | |
49668688 RR |
2840 | static inline void kmemleak_load_module(const struct module *mod, |
2841 | const struct load_info *info) | |
4f2294b6 CM |
2842 | { |
2843 | } | |
2844 | #endif | |
2845 | ||
106a4ee2 | 2846 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2847 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 | 2848 | { |
49fcf732 | 2849 | int err = -ENODATA; |
34e1169d | 2850 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
49fcf732 | 2851 | const char *reason; |
34e1169d | 2852 | const void *mod = info->hdr; |
caabe240 | 2853 | |
bca014ca BH |
2854 | /* |
2855 | * Require flags == 0, as a module with version information | |
2856 | * removed is no longer the module that was signed | |
2857 | */ | |
2858 | if (flags == 0 && | |
2859 | info->len > markerlen && | |
34e1169d | 2860 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2861 | /* We truncate the module to discard the signature */ |
34e1169d | 2862 | info->len -= markerlen; |
f314dfea | 2863 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2864 | } |
2865 | ||
49fcf732 DH |
2866 | switch (err) { |
2867 | case 0: | |
106a4ee2 RR |
2868 | info->sig_ok = true; |
2869 | return 0; | |
106a4ee2 | 2870 | |
49fcf732 DH |
2871 | /* We don't permit modules to be loaded into trusted kernels |
2872 | * without a valid signature on them, but if we're not | |
2873 | * enforcing, certain errors are non-fatal. | |
2874 | */ | |
2875 | case -ENODATA: | |
2876 | reason = "Loading of unsigned module"; | |
2877 | goto decide; | |
2878 | case -ENOPKG: | |
2879 | reason = "Loading of module with unsupported crypto"; | |
2880 | goto decide; | |
2881 | case -ENOKEY: | |
2882 | reason = "Loading of module with unavailable key"; | |
2883 | decide: | |
2884 | if (is_module_sig_enforced()) { | |
2885 | pr_notice("%s is rejected\n", reason); | |
2886 | return -EKEYREJECTED; | |
2887 | } | |
106a4ee2 | 2888 | |
49fcf732 DH |
2889 | return security_locked_down(LOCKDOWN_MODULE_SIGNATURE); |
2890 | ||
2891 | /* All other errors are fatal, including nomem, unparseable | |
2892 | * signatures and signature check failures - even if signatures | |
2893 | * aren't required. | |
2894 | */ | |
2895 | default: | |
2896 | return err; | |
2897 | } | |
106a4ee2 RR |
2898 | } |
2899 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2900 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2901 | { |
2902 | return 0; | |
2903 | } | |
2904 | #endif /* !CONFIG_MODULE_SIG */ | |
2905 | ||
34e1169d KC |
2906 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2907 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2908 | { |
34e1169d KC |
2909 | if (info->len < sizeof(*(info->hdr))) |
2910 | return -ENOEXEC; | |
2911 | ||
2912 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2913 | || info->hdr->e_type != ET_REL | |
2914 | || !elf_check_arch(info->hdr) | |
2915 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2916 | return -ENOEXEC; | |
2917 | ||
2918 | if (info->hdr->e_shoff >= info->len | |
2919 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2920 | info->len - info->hdr->e_shoff)) | |
2921 | return -ENOEXEC; | |
40dd2560 | 2922 | |
34e1169d KC |
2923 | return 0; |
2924 | } | |
2925 | ||
3afe9f84 LT |
2926 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2927 | ||
2928 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2929 | { | |
2930 | do { | |
2931 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2932 | ||
2933 | if (copy_from_user(dst, usrc, n) != 0) | |
2934 | return -EFAULT; | |
2935 | cond_resched(); | |
2936 | dst += n; | |
2937 | usrc += n; | |
2938 | len -= n; | |
2939 | } while (len); | |
2940 | return 0; | |
2941 | } | |
2942 | ||
1ce15ef4 | 2943 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2944 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2945 | { |
2992ef29 JP |
2946 | if (get_modinfo(info, "livepatch")) { |
2947 | mod->klp = true; | |
2948 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2949 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2950 | mod->name); | |
2992ef29 | 2951 | } |
1ce15ef4 JY |
2952 | |
2953 | return 0; | |
2954 | } | |
2955 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2956 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2957 | { |
2958 | if (get_modinfo(info, "livepatch")) { | |
2959 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2960 | mod->name); | |
2961 | return -ENOEXEC; | |
2962 | } | |
2963 | ||
2964 | return 0; | |
2965 | } | |
2966 | #endif /* CONFIG_LIVEPATCH */ | |
2967 | ||
caf7501a AK |
2968 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2969 | { | |
2970 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2971 | return; | |
2972 | ||
2973 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2974 | mod->name); | |
2975 | } | |
2976 | ||
34e1169d KC |
2977 | /* Sets info->hdr and info->len. */ |
2978 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2979 | struct load_info *info) | |
40dd2560 RR |
2980 | { |
2981 | int err; | |
40dd2560 | 2982 | |
34e1169d KC |
2983 | info->len = len; |
2984 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2985 | return -ENOEXEC; |
2986 | ||
c77b8cdf | 2987 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2988 | if (err) |
2989 | return err; | |
2990 | ||
40dd2560 | 2991 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2992 | info->hdr = __vmalloc(info->len, |
19809c2d | 2993 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2994 | if (!info->hdr) |
40dd2560 RR |
2995 | return -ENOMEM; |
2996 | ||
3afe9f84 | 2997 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2998 | vfree(info->hdr); |
2999 | return -EFAULT; | |
40dd2560 RR |
3000 | } |
3001 | ||
34e1169d KC |
3002 | return 0; |
3003 | } | |
3004 | ||
d913188c RR |
3005 | static void free_copy(struct load_info *info) |
3006 | { | |
d913188c RR |
3007 | vfree(info->hdr); |
3008 | } | |
3009 | ||
2f3238ae | 3010 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
3011 | { |
3012 | unsigned int i; | |
3013 | ||
3014 | /* This should always be true, but let's be sure. */ | |
3015 | info->sechdrs[0].sh_addr = 0; | |
3016 | ||
3017 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3018 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
3019 | if (shdr->sh_type != SHT_NOBITS | |
3020 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 3021 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
3022 | return -ENOEXEC; |
3023 | } | |
3024 | ||
3025 | /* Mark all sections sh_addr with their address in the | |
3026 | temporary image. */ | |
3027 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
3028 | ||
3029 | #ifndef CONFIG_MODULE_UNLOAD | |
3030 | /* Don't load .exit sections */ | |
38b37d63 | 3031 | if (module_exit_section(info->secstrings+shdr->sh_name)) |
8b5f61a7 RR |
3032 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; |
3033 | #endif | |
8b5f61a7 | 3034 | } |
d6df72a0 RR |
3035 | |
3036 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 3037 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 3038 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 3039 | |
8b5f61a7 RR |
3040 | return 0; |
3041 | } | |
3042 | ||
3264d3f9 LT |
3043 | /* |
3044 | * Set up our basic convenience variables (pointers to section headers, | |
3045 | * search for module section index etc), and do some basic section | |
3046 | * verification. | |
3047 | * | |
81a0abd9 JY |
3048 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
3049 | * will be allocated in move_module(). | |
3264d3f9 | 3050 | */ |
81a0abd9 | 3051 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
3052 | { |
3053 | unsigned int i; | |
3264d3f9 LT |
3054 | |
3055 | /* Set up the convenience variables */ | |
3056 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
3057 | info->secstrings = (void *)info->hdr |
3058 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 3059 | |
5fdc7db6 JY |
3060 | /* Try to find a name early so we can log errors with a module name */ |
3061 | info->index.info = find_sec(info, ".modinfo"); | |
fde4a71f | 3062 | if (info->index.info) |
5fdc7db6 | 3063 | info->name = get_modinfo(info, "name"); |
3264d3f9 | 3064 | |
8b5f61a7 RR |
3065 | /* Find internal symbols and strings. */ |
3066 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
3067 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
3068 | info->index.sym = i; | |
3069 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
3070 | info->strtab = (char *)info->hdr |
3071 | + info->sechdrs[info->index.str].sh_offset; | |
3072 | break; | |
3264d3f9 | 3073 | } |
3264d3f9 LT |
3074 | } |
3075 | ||
5fdc7db6 | 3076 | if (info->index.sym == 0) { |
fde4a71f JY |
3077 | pr_warn("%s: module has no symbols (stripped?)\n", |
3078 | info->name ?: "(missing .modinfo section or name field)"); | |
5fdc7db6 JY |
3079 | return -ENOEXEC; |
3080 | } | |
3081 | ||
49668688 | 3082 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 3083 | if (!info->index.mod) { |
3e2e857f | 3084 | pr_warn("%s: No module found in object\n", |
fde4a71f | 3085 | info->name ?: "(missing .modinfo section or name field)"); |
81a0abd9 | 3086 | return -ENOEXEC; |
3264d3f9 LT |
3087 | } |
3088 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 3089 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 3090 | |
3e2e857f | 3091 | /* |
5fdc7db6 | 3092 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
3093 | * on-disk struct mod 'name' field. |
3094 | */ | |
3095 | if (!info->name) | |
81a0abd9 | 3096 | info->name = info->mod->name; |
3e2e857f | 3097 | |
5fdc7db6 JY |
3098 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
3099 | info->index.vers = 0; /* Pretend no __versions section! */ | |
3100 | else | |
3101 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 3102 | |
49668688 | 3103 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3104 | |
81a0abd9 | 3105 | return 0; |
3264d3f9 LT |
3106 | } |
3107 | ||
2f3238ae | 3108 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3109 | { |
49668688 | 3110 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3111 | int err; |
3112 | ||
2f3238ae RR |
3113 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3114 | modmagic = NULL; | |
3115 | ||
40dd2560 RR |
3116 | /* This is allowed: modprobe --force will invalidate it. */ |
3117 | if (!modmagic) { | |
3118 | err = try_to_force_load(mod, "bad vermagic"); | |
3119 | if (err) | |
3120 | return err; | |
49668688 | 3121 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3122 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3123 | info->name, modmagic, vermagic); |
40dd2560 RR |
3124 | return -ENOEXEC; |
3125 | } | |
3126 | ||
3205c36c LP |
3127 | if (!get_modinfo(info, "intree")) { |
3128 | if (!test_taint(TAINT_OOT_MODULE)) | |
3129 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3130 | mod->name); | |
373d4d09 | 3131 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3132 | } |
2449b8ba | 3133 | |
caf7501a AK |
3134 | check_modinfo_retpoline(mod, info); |
3135 | ||
49668688 | 3136 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3137 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3138 | pr_warn("%s: module is from the staging directory, the quality " |
3139 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3140 | } |
22e268eb | 3141 | |
2992ef29 | 3142 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3143 | if (err) |
3144 | return err; | |
3145 | ||
22e268eb | 3146 | /* Set up license info based on the info section */ |
49668688 | 3147 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3148 | |
40dd2560 RR |
3149 | return 0; |
3150 | } | |
3151 | ||
eb3057df | 3152 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3153 | { |
49668688 | 3154 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3155 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3156 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3157 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3158 | mod->crcs = section_addr(info, "__kcrctab"); |
3159 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3160 | sizeof(*mod->gpl_syms), |
3161 | &mod->num_gpl_syms); | |
49668688 RR |
3162 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3163 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3164 | "__ksymtab_gpl_future", |
3165 | sizeof(*mod->gpl_future_syms), | |
3166 | &mod->num_gpl_future_syms); | |
49668688 | 3167 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3168 | |
3169 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3170 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3171 | sizeof(*mod->unused_syms), |
3172 | &mod->num_unused_syms); | |
49668688 RR |
3173 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3174 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3175 | sizeof(*mod->unused_gpl_syms), |
3176 | &mod->num_unused_gpl_syms); | |
49668688 | 3177 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3178 | #endif |
3179 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3180 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3181 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3182 | if (!mod->ctors) |
3183 | mod->ctors = section_objs(info, ".init_array", | |
3184 | sizeof(*mod->ctors), &mod->num_ctors); | |
3185 | else if (find_sec(info, ".init_array")) { | |
3186 | /* | |
3187 | * This shouldn't happen with same compiler and binutils | |
3188 | * building all parts of the module. | |
3189 | */ | |
6da0b565 | 3190 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3191 | mod->name); |
3192 | return -EINVAL; | |
3193 | } | |
f91a13bb LT |
3194 | #endif |
3195 | ||
3196 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3197 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3198 | sizeof(*mod->tracepoints_ptrs), | |
3199 | &mod->num_tracepoints); | |
f91a13bb | 3200 | #endif |
fe15b50c PM |
3201 | #ifdef CONFIG_TREE_SRCU |
3202 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
3203 | sizeof(*mod->srcu_struct_ptrs), | |
3204 | &mod->num_srcu_structs); | |
3205 | #endif | |
a38d1107 MM |
3206 | #ifdef CONFIG_BPF_EVENTS |
3207 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3208 | sizeof(*mod->bpf_raw_events), | |
3209 | &mod->num_bpf_raw_events); | |
3210 | #endif | |
e9666d10 | 3211 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3212 | mod->jump_entries = section_objs(info, "__jump_table", |
3213 | sizeof(*mod->jump_entries), | |
3214 | &mod->num_jump_entries); | |
3215 | #endif | |
f91a13bb | 3216 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3217 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3218 | sizeof(*mod->trace_events), |
3219 | &mod->num_trace_events); | |
99be647c JL |
3220 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3221 | sizeof(*mod->trace_evals), | |
3222 | &mod->num_trace_evals); | |
f91a13bb | 3223 | #endif |
13b9b6e7 SR |
3224 | #ifdef CONFIG_TRACING |
3225 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3226 | sizeof(*mod->trace_bprintk_fmt_start), | |
3227 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3228 | #endif |
f91a13bb LT |
3229 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3230 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3231 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3232 | sizeof(*mod->ftrace_callsites), |
3233 | &mod->num_ftrace_callsites); | |
3234 | #endif | |
540adea3 MH |
3235 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3236 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3237 | sizeof(*mod->ei_funcs), | |
3238 | &mod->num_ei_funcs); | |
92ace999 | 3239 | #endif |
811d66a0 RR |
3240 | mod->extable = section_objs(info, "__ex_table", |
3241 | sizeof(*mod->extable), &mod->num_exentries); | |
3242 | ||
49668688 | 3243 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3244 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3245 | |
3246 | info->debug = section_objs(info, "__verbose", | |
3247 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3248 | |
3249 | return 0; | |
f91a13bb LT |
3250 | } |
3251 | ||
49668688 | 3252 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3253 | { |
3254 | int i; | |
3255 | void *ptr; | |
3256 | ||
3257 | /* Do the allocs. */ | |
7523e4dc | 3258 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3259 | /* |
3260 | * The pointer to this block is stored in the module structure | |
3261 | * which is inside the block. Just mark it as not being a | |
3262 | * leak. | |
3263 | */ | |
3264 | kmemleak_not_leak(ptr); | |
3265 | if (!ptr) | |
d913188c | 3266 | return -ENOMEM; |
65b8a9b4 | 3267 | |
7523e4dc RR |
3268 | memset(ptr, 0, mod->core_layout.size); |
3269 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3270 | |
7523e4dc RR |
3271 | if (mod->init_layout.size) { |
3272 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3273 | /* |
3274 | * The pointer to this block is stored in the module structure | |
3275 | * which is inside the block. This block doesn't need to be | |
3276 | * scanned as it contains data and code that will be freed | |
3277 | * after the module is initialized. | |
3278 | */ | |
3279 | kmemleak_ignore(ptr); | |
3280 | if (!ptr) { | |
7523e4dc | 3281 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3282 | return -ENOMEM; |
3283 | } | |
7523e4dc RR |
3284 | memset(ptr, 0, mod->init_layout.size); |
3285 | mod->init_layout.base = ptr; | |
82fab442 | 3286 | } else |
7523e4dc | 3287 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3288 | |
3289 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3290 | pr_debug("final section addresses:\n"); |
49668688 | 3291 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3292 | void *dest; |
49668688 | 3293 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3294 | |
49668688 | 3295 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3296 | continue; |
3297 | ||
49668688 | 3298 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3299 | dest = mod->init_layout.base |
49668688 | 3300 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3301 | else |
7523e4dc | 3302 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3303 | |
49668688 RR |
3304 | if (shdr->sh_type != SHT_NOBITS) |
3305 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3306 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3307 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3308 | pr_debug("\t0x%lx %s\n", |
3309 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3310 | } |
d913188c RR |
3311 | |
3312 | return 0; | |
65b8a9b4 LT |
3313 | } |
3314 | ||
49668688 | 3315 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3316 | { |
3205c36c LP |
3317 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3318 | ||
22e268eb RR |
3319 | /* |
3320 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3321 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3322 | * using GPL-only symbols it needs. | |
3323 | */ | |
3324 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3325 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3326 | |
3327 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3328 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3329 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3330 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3331 | |
c99af375 MG |
3332 | /* lve claims to be GPL but upstream won't provide source */ |
3333 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3334 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3335 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3336 | |
3205c36c LP |
3337 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3338 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3339 | ||
22e268eb RR |
3340 | #ifdef CONFIG_MODVERSIONS |
3341 | if ((mod->num_syms && !mod->crcs) | |
3342 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3343 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3344 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3345 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3346 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3347 | #endif | |
3348 | ) { | |
3349 | return try_to_force_load(mod, | |
3350 | "no versions for exported symbols"); | |
3351 | } | |
3352 | #endif | |
3353 | return 0; | |
3354 | } | |
3355 | ||
3356 | static void flush_module_icache(const struct module *mod) | |
3357 | { | |
3358 | mm_segment_t old_fs; | |
3359 | ||
3360 | /* flush the icache in correct context */ | |
3361 | old_fs = get_fs(); | |
3362 | set_fs(KERNEL_DS); | |
3363 | ||
3364 | /* | |
3365 | * Flush the instruction cache, since we've played with text. | |
3366 | * Do it before processing of module parameters, so the module | |
3367 | * can provide parameter accessor functions of its own. | |
3368 | */ | |
7523e4dc RR |
3369 | if (mod->init_layout.base) |
3370 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3371 | (unsigned long)mod->init_layout.base | |
3372 | + mod->init_layout.size); | |
3373 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3374 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3375 | |
3376 | set_fs(old_fs); | |
3377 | } | |
3378 | ||
74e08fcf JB |
3379 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3380 | Elf_Shdr *sechdrs, | |
3381 | char *secstrings, | |
3382 | struct module *mod) | |
3383 | { | |
3384 | return 0; | |
3385 | } | |
3386 | ||
be7de5f9 PB |
3387 | /* module_blacklist is a comma-separated list of module names */ |
3388 | static char *module_blacklist; | |
96b5b194 | 3389 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3390 | { |
3391 | const char *p; | |
3392 | size_t len; | |
3393 | ||
3394 | if (!module_blacklist) | |
3395 | return false; | |
3396 | ||
3397 | for (p = module_blacklist; *p; p += len) { | |
3398 | len = strcspn(p, ","); | |
3399 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3400 | return true; | |
3401 | if (p[len] == ',') | |
3402 | len++; | |
3403 | } | |
3404 | return false; | |
3405 | } | |
3406 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3407 | ||
2f3238ae | 3408 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3409 | { |
1da177e4 | 3410 | struct module *mod; |
444d13ff | 3411 | unsigned int ndx; |
d913188c | 3412 | int err; |
3ae91c21 | 3413 | |
81a0abd9 | 3414 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3415 | if (err) |
3416 | return ERR_PTR(err); | |
1da177e4 | 3417 | |
1da177e4 | 3418 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3419 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3420 | info->secstrings, info->mod); |
1da177e4 | 3421 | if (err < 0) |
8d8022e8 | 3422 | return ERR_PTR(err); |
1da177e4 | 3423 | |
8d8022e8 RR |
3424 | /* We will do a special allocation for per-cpu sections later. */ |
3425 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3426 | |
444d13ff JY |
3427 | /* |
3428 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3429 | * layout_sections() can put it in the right place. | |
3430 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3431 | */ | |
3432 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3433 | if (ndx) |
3434 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3435 | /* | |
3436 | * Mark the __jump_table section as ro_after_init as well: these data | |
3437 | * structures are never modified, with the exception of entries that | |
3438 | * refer to code in the __init section, which are annotated as such | |
3439 | * at module load time. | |
3440 | */ | |
3441 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3442 | if (ndx) |
3443 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3444 | ||
1da177e4 LT |
3445 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3446 | this is done generically; there doesn't appear to be any | |
3447 | special cases for the architectures. */ | |
81a0abd9 JY |
3448 | layout_sections(info->mod, info); |
3449 | layout_symtab(info->mod, info); | |
1da177e4 | 3450 | |
65b8a9b4 | 3451 | /* Allocate and move to the final place */ |
81a0abd9 | 3452 | err = move_module(info->mod, info); |
d913188c | 3453 | if (err) |
8d8022e8 | 3454 | return ERR_PTR(err); |
d913188c RR |
3455 | |
3456 | /* Module has been copied to its final place now: return it. */ | |
3457 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3458 | kmemleak_load_module(mod, info); |
d913188c | 3459 | return mod; |
d913188c RR |
3460 | } |
3461 | ||
3462 | /* mod is no longer valid after this! */ | |
3463 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3464 | { | |
d913188c | 3465 | percpu_modfree(mod); |
d453cded | 3466 | module_arch_freeing_init(mod); |
7523e4dc RR |
3467 | module_memfree(mod->init_layout.base); |
3468 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3469 | } |
3470 | ||
74e08fcf JB |
3471 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3472 | const Elf_Shdr *sechdrs, | |
3473 | struct module *me) | |
3474 | { | |
3475 | return 0; | |
3476 | } | |
3477 | ||
811d66a0 RR |
3478 | static int post_relocation(struct module *mod, const struct load_info *info) |
3479 | { | |
51f3d0f4 | 3480 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3481 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3482 | ||
3483 | /* Copy relocated percpu area over. */ | |
3484 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3485 | info->sechdrs[info->index.pcpu].sh_size); | |
3486 | ||
51f3d0f4 | 3487 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3488 | add_kallsyms(mod, info); |
3489 | ||
3490 | /* Arch-specific module finalizing. */ | |
3491 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3492 | } | |
3493 | ||
9bb9c3be RR |
3494 | /* Is this module of this name done loading? No locks held. */ |
3495 | static bool finished_loading(const char *name) | |
3496 | { | |
3497 | struct module *mod; | |
3498 | bool ret; | |
3499 | ||
9cc019b8 PZ |
3500 | /* |
3501 | * The module_mutex should not be a heavily contended lock; | |
3502 | * if we get the occasional sleep here, we'll go an extra iteration | |
3503 | * in the wait_event_interruptible(), which is harmless. | |
3504 | */ | |
3505 | sched_annotate_sleep(); | |
9bb9c3be | 3506 | mutex_lock(&module_mutex); |
4f6de4d5 | 3507 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 3508 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
3509 | mutex_unlock(&module_mutex); |
3510 | ||
3511 | return ret; | |
3512 | } | |
3513 | ||
34e1169d KC |
3514 | /* Call module constructors. */ |
3515 | static void do_mod_ctors(struct module *mod) | |
3516 | { | |
3517 | #ifdef CONFIG_CONSTRUCTORS | |
3518 | unsigned long i; | |
3519 | ||
3520 | for (i = 0; i < mod->num_ctors; i++) | |
3521 | mod->ctors[i](); | |
3522 | #endif | |
3523 | } | |
3524 | ||
c7496379 RR |
3525 | /* For freeing module_init on success, in case kallsyms traversing */ |
3526 | struct mod_initfree { | |
1a7b7d92 | 3527 | struct llist_node node; |
c7496379 RR |
3528 | void *module_init; |
3529 | }; | |
3530 | ||
1a7b7d92 | 3531 | static void do_free_init(struct work_struct *w) |
c7496379 | 3532 | { |
1a7b7d92 RE |
3533 | struct llist_node *pos, *n, *list; |
3534 | struct mod_initfree *initfree; | |
3535 | ||
3536 | list = llist_del_all(&init_free_list); | |
3537 | ||
3538 | synchronize_rcu(); | |
3539 | ||
3540 | llist_for_each_safe(pos, n, list) { | |
3541 | initfree = container_of(pos, struct mod_initfree, node); | |
3542 | module_memfree(initfree->module_init); | |
3543 | kfree(initfree); | |
3544 | } | |
c7496379 RR |
3545 | } |
3546 | ||
1a7b7d92 RE |
3547 | static int __init modules_wq_init(void) |
3548 | { | |
3549 | INIT_WORK(&init_free_wq, do_free_init); | |
3550 | init_llist_head(&init_free_list); | |
3551 | return 0; | |
3552 | } | |
3553 | module_init(modules_wq_init); | |
3554 | ||
be02a186 JK |
3555 | /* |
3556 | * This is where the real work happens. | |
3557 | * | |
3558 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3559 | * helper command 'lx-symbols'. | |
3560 | */ | |
3561 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3562 | { |
3563 | int ret = 0; | |
c7496379 RR |
3564 | struct mod_initfree *freeinit; |
3565 | ||
3566 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3567 | if (!freeinit) { | |
3568 | ret = -ENOMEM; | |
3569 | goto fail; | |
3570 | } | |
7523e4dc | 3571 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3572 | |
774a1221 TH |
3573 | /* |
3574 | * We want to find out whether @mod uses async during init. Clear | |
3575 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3576 | */ | |
3577 | current->flags &= ~PF_USED_ASYNC; | |
3578 | ||
34e1169d KC |
3579 | do_mod_ctors(mod); |
3580 | /* Start the module */ | |
3581 | if (mod->init != NULL) | |
3582 | ret = do_one_initcall(mod->init); | |
3583 | if (ret < 0) { | |
c7496379 | 3584 | goto fail_free_freeinit; |
34e1169d KC |
3585 | } |
3586 | if (ret > 0) { | |
bddb12b3 AM |
3587 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3588 | "follow 0/-E convention\n" | |
3589 | "%s: loading module anyway...\n", | |
3590 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3591 | dump_stack(); |
3592 | } | |
3593 | ||
3594 | /* Now it's a first class citizen! */ | |
3595 | mod->state = MODULE_STATE_LIVE; | |
3596 | blocking_notifier_call_chain(&module_notify_list, | |
3597 | MODULE_STATE_LIVE, mod); | |
3598 | ||
774a1221 TH |
3599 | /* |
3600 | * We need to finish all async code before the module init sequence | |
3601 | * is done. This has potential to deadlock. For example, a newly | |
3602 | * detected block device can trigger request_module() of the | |
3603 | * default iosched from async probing task. Once userland helper | |
3604 | * reaches here, async_synchronize_full() will wait on the async | |
3605 | * task waiting on request_module() and deadlock. | |
3606 | * | |
3607 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3608 | * iff module init queued any async jobs. This isn't a full | |
3609 | * solution as it will deadlock the same if module loading from | |
3610 | * async jobs nests more than once; however, due to the various | |
3611 | * constraints, this hack seems to be the best option for now. | |
3612 | * Please refer to the following thread for details. | |
3613 | * | |
3614 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3615 | */ | |
f2411da7 | 3616 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3617 | async_synchronize_full(); |
34e1169d | 3618 | |
aba4b5c2 | 3619 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3620 | mod->init_layout.size); |
34e1169d KC |
3621 | mutex_lock(&module_mutex); |
3622 | /* Drop initial reference. */ | |
3623 | module_put(mod); | |
3624 | trim_init_extable(mod); | |
3625 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3626 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3627 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3628 | #endif |
444d13ff | 3629 | module_enable_ro(mod, true); |
93c2e105 | 3630 | mod_tree_remove_init(mod); |
d453cded | 3631 | module_arch_freeing_init(mod); |
7523e4dc RR |
3632 | mod->init_layout.base = NULL; |
3633 | mod->init_layout.size = 0; | |
3634 | mod->init_layout.ro_size = 0; | |
444d13ff | 3635 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3636 | mod->init_layout.text_size = 0; |
c7496379 RR |
3637 | /* |
3638 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3639 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3640 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3641 | * path. module_memfree() cannot be called in an interrupt, so do the |
3642 | * work and call synchronize_rcu() in a work queue. | |
3643 | * | |
ae646f0b JH |
3644 | * Note that module_alloc() on most architectures creates W+X page |
3645 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3646 | * code such as mark_rodata_ro() which depends on those mappings to | |
3647 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3648 | * rcu_barrier() |
c7496379 | 3649 | */ |
1a7b7d92 RE |
3650 | if (llist_add(&freeinit->node, &init_free_list)) |
3651 | schedule_work(&init_free_wq); | |
3652 | ||
34e1169d KC |
3653 | mutex_unlock(&module_mutex); |
3654 | wake_up_all(&module_wq); | |
3655 | ||
3656 | return 0; | |
c7496379 RR |
3657 | |
3658 | fail_free_freeinit: | |
3659 | kfree(freeinit); | |
3660 | fail: | |
3661 | /* Try to protect us from buggy refcounters. */ | |
3662 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3663 | synchronize_rcu(); |
c7496379 RR |
3664 | module_put(mod); |
3665 | blocking_notifier_call_chain(&module_notify_list, | |
3666 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3667 | klp_module_going(mod); |
7dcd182b | 3668 | ftrace_release_mod(mod); |
c7496379 RR |
3669 | free_module(mod); |
3670 | wake_up_all(&module_wq); | |
3671 | return ret; | |
34e1169d KC |
3672 | } |
3673 | ||
3674 | static int may_init_module(void) | |
3675 | { | |
3676 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3677 | return -EPERM; | |
3678 | ||
3679 | return 0; | |
3680 | } | |
3681 | ||
a3535c7e RR |
3682 | /* |
3683 | * We try to place it in the list now to make sure it's unique before | |
3684 | * we dedicate too many resources. In particular, temporary percpu | |
3685 | * memory exhaustion. | |
3686 | */ | |
3687 | static int add_unformed_module(struct module *mod) | |
3688 | { | |
3689 | int err; | |
3690 | struct module *old; | |
3691 | ||
3692 | mod->state = MODULE_STATE_UNFORMED; | |
3693 | ||
3694 | again: | |
3695 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3696 | old = find_module_all(mod->name, strlen(mod->name), true); |
3697 | if (old != NULL) { | |
6e6de3de | 3698 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
3699 | /* Wait in case it fails to load. */ |
3700 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3701 | err = wait_event_interruptible(module_wq, |
3702 | finished_loading(mod->name)); | |
a3535c7e RR |
3703 | if (err) |
3704 | goto out_unlocked; | |
3705 | goto again; | |
3706 | } | |
3707 | err = -EEXIST; | |
3708 | goto out; | |
3709 | } | |
4f666546 | 3710 | mod_update_bounds(mod); |
a3535c7e | 3711 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3712 | mod_tree_insert(mod); |
a3535c7e RR |
3713 | err = 0; |
3714 | ||
3715 | out: | |
3716 | mutex_unlock(&module_mutex); | |
3717 | out_unlocked: | |
3718 | return err; | |
3719 | } | |
3720 | ||
3721 | static int complete_formation(struct module *mod, struct load_info *info) | |
3722 | { | |
3723 | int err; | |
3724 | ||
3725 | mutex_lock(&module_mutex); | |
3726 | ||
3727 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3728 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3729 | if (err < 0) |
3730 | goto out; | |
3731 | ||
3732 | /* This relies on module_mutex for list integrity. */ | |
3733 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3734 | ||
444d13ff | 3735 | module_enable_ro(mod, false); |
85c898db | 3736 | module_enable_nx(mod); |
2eef1399 | 3737 | module_enable_x(mod); |
4982223e | 3738 | |
a3535c7e RR |
3739 | /* Mark state as coming so strong_try_module_get() ignores us, |
3740 | * but kallsyms etc. can see us. */ | |
3741 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3742 | mutex_unlock(&module_mutex); |
3743 | ||
4982223e | 3744 | return 0; |
a3535c7e RR |
3745 | |
3746 | out: | |
3747 | mutex_unlock(&module_mutex); | |
3748 | return err; | |
3749 | } | |
3750 | ||
4c973d16 JY |
3751 | static int prepare_coming_module(struct module *mod) |
3752 | { | |
7e545d6e JY |
3753 | int err; |
3754 | ||
4c973d16 | 3755 | ftrace_module_enable(mod); |
7e545d6e JY |
3756 | err = klp_module_coming(mod); |
3757 | if (err) | |
3758 | return err; | |
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 |