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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 | */ |
51161bfc LR |
7 | |
8 | #define INCLUDE_VERMAGIC | |
9 | ||
9984de1a | 10 | #include <linux/export.h> |
8a293be0 | 11 | #include <linux/extable.h> |
1da177e4 | 12 | #include <linux/moduleloader.h> |
c8424e77 | 13 | #include <linux/module_signature.h> |
af658dca | 14 | #include <linux/trace_events.h> |
1da177e4 | 15 | #include <linux/init.h> |
ae84e324 | 16 | #include <linux/kallsyms.h> |
34e1169d | 17 | #include <linux/file.h> |
3b5d5c6b | 18 | #include <linux/fs.h> |
6d760133 | 19 | #include <linux/sysfs.h> |
9f158333 | 20 | #include <linux/kernel.h> |
1da177e4 LT |
21 | #include <linux/slab.h> |
22 | #include <linux/vmalloc.h> | |
23 | #include <linux/elf.h> | |
3b5d5c6b | 24 | #include <linux/proc_fs.h> |
2e72d51b | 25 | #include <linux/security.h> |
1da177e4 LT |
26 | #include <linux/seq_file.h> |
27 | #include <linux/syscalls.h> | |
28 | #include <linux/fcntl.h> | |
29 | #include <linux/rcupdate.h> | |
c59ede7b | 30 | #include <linux/capability.h> |
1da177e4 LT |
31 | #include <linux/cpu.h> |
32 | #include <linux/moduleparam.h> | |
33 | #include <linux/errno.h> | |
34 | #include <linux/err.h> | |
35 | #include <linux/vermagic.h> | |
36 | #include <linux/notifier.h> | |
f6a57033 | 37 | #include <linux/sched.h> |
1da177e4 | 38 | #include <linux/device.h> |
c988d2b2 | 39 | #include <linux/string.h> |
97d1f15b | 40 | #include <linux/mutex.h> |
d72b3751 | 41 | #include <linux/rculist.h> |
7c0f6ba6 | 42 | #include <linux/uaccess.h> |
1da177e4 | 43 | #include <asm/cacheflush.h> |
563ec5cb | 44 | #include <linux/set_memory.h> |
eb8cdec4 | 45 | #include <asm/mmu_context.h> |
b817f6fe | 46 | #include <linux/license.h> |
6d762394 | 47 | #include <asm/sections.h> |
97e1c18e | 48 | #include <linux/tracepoint.h> |
90d595fe | 49 | #include <linux/ftrace.h> |
7e545d6e | 50 | #include <linux/livepatch.h> |
22a9d645 | 51 | #include <linux/async.h> |
fbf59bc9 | 52 | #include <linux/percpu.h> |
4f2294b6 | 53 | #include <linux/kmemleak.h> |
bf5438fc | 54 | #include <linux/jump_label.h> |
84e1c6bb | 55 | #include <linux/pfn.h> |
403ed278 | 56 | #include <linux/bsearch.h> |
9d5059c9 | 57 | #include <linux/dynamic_debug.h> |
ca86cad7 | 58 | #include <linux/audit.h> |
2f3238ae | 59 | #include <uapi/linux/module.h> |
106a4ee2 | 60 | #include "module-internal.h" |
1da177e4 | 61 | |
7ead8b83 LZ |
62 | #define CREATE_TRACE_POINTS |
63 | #include <trace/events/module.h> | |
64 | ||
1da177e4 LT |
65 | #ifndef ARCH_SHF_SMALL |
66 | #define ARCH_SHF_SMALL 0 | |
67 | #endif | |
68 | ||
84e1c6bb MC |
69 | /* |
70 | * Modules' sections will be aligned on page boundaries | |
3b5be16c HZ |
71 | * to ensure complete separation of code and data, but |
72 | * only when CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y | |
84e1c6bb | 73 | */ |
3b5be16c | 74 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb | 75 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
3b5be16c HZ |
76 | #else |
77 | # define debug_align(X) (X) | |
78 | #endif | |
84e1c6bb | 79 | |
1da177e4 LT |
80 | /* If this is set, the section belongs in the init part of the module */ |
81 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
82 | ||
75676500 RR |
83 | /* |
84 | * Mutex protects: | |
85 | * 1) List of modules (also safely readable with preempt_disable), | |
86 | * 2) module_use links, | |
87 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 88 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
89 | DEFINE_MUTEX(module_mutex); |
90 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 91 | static LIST_HEAD(modules); |
67fc4e0c | 92 | |
1a7b7d92 RE |
93 | /* Work queue for freeing init sections in success case */ |
94 | static struct work_struct init_free_wq; | |
95 | static struct llist_head init_free_list; | |
96 | ||
6c9692e2 | 97 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 98 | |
93c2e105 PZ |
99 | /* |
100 | * Use a latched RB-tree for __module_address(); this allows us to use | |
101 | * RCU-sched lookups of the address from any context. | |
102 | * | |
6c9692e2 PZ |
103 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
104 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
105 | * NMI context. | |
93c2e105 PZ |
106 | */ |
107 | ||
108 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 109 | { |
7523e4dc | 110 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 111 | |
7523e4dc | 112 | return (unsigned long)layout->base; |
93c2e105 PZ |
113 | } |
114 | ||
115 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
116 | { | |
7523e4dc | 117 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 118 | |
7523e4dc | 119 | return (unsigned long)layout->size; |
93c2e105 PZ |
120 | } |
121 | ||
122 | static __always_inline bool | |
123 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
124 | { | |
125 | return __mod_tree_val(a) < __mod_tree_val(b); | |
126 | } | |
127 | ||
128 | static __always_inline int | |
129 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
130 | { | |
131 | unsigned long val = (unsigned long)key; | |
132 | unsigned long start, end; | |
133 | ||
134 | start = __mod_tree_val(n); | |
135 | if (val < start) | |
136 | return -1; | |
137 | ||
138 | end = start + __mod_tree_size(n); | |
139 | if (val >= end) | |
140 | return 1; | |
106a4ee2 | 141 | |
106a4ee2 RR |
142 | return 0; |
143 | } | |
144 | ||
93c2e105 PZ |
145 | static const struct latch_tree_ops mod_tree_ops = { |
146 | .less = mod_tree_less, | |
147 | .comp = mod_tree_comp, | |
148 | }; | |
149 | ||
4f666546 PZ |
150 | static struct mod_tree_root { |
151 | struct latch_tree_root root; | |
152 | unsigned long addr_min; | |
153 | unsigned long addr_max; | |
154 | } mod_tree __cacheline_aligned = { | |
155 | .addr_min = -1UL, | |
106a4ee2 | 156 | }; |
106a4ee2 | 157 | |
4f666546 PZ |
158 | #define module_addr_min mod_tree.addr_min |
159 | #define module_addr_max mod_tree.addr_max | |
160 | ||
161 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
162 | { | |
163 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
164 | } | |
165 | ||
166 | static void __mod_tree_remove(struct mod_tree_node *node) | |
167 | { | |
168 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
169 | } | |
93c2e105 PZ |
170 | |
171 | /* | |
172 | * These modifications: insert, remove_init and remove; are serialized by the | |
173 | * module_mutex. | |
174 | */ | |
175 | static void mod_tree_insert(struct module *mod) | |
176 | { | |
7523e4dc RR |
177 | mod->core_layout.mtn.mod = mod; |
178 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 179 | |
7523e4dc RR |
180 | __mod_tree_insert(&mod->core_layout.mtn); |
181 | if (mod->init_layout.size) | |
182 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
183 | } |
184 | ||
185 | static void mod_tree_remove_init(struct module *mod) | |
186 | { | |
7523e4dc RR |
187 | if (mod->init_layout.size) |
188 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
189 | } |
190 | ||
191 | static void mod_tree_remove(struct module *mod) | |
192 | { | |
7523e4dc | 193 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
194 | mod_tree_remove_init(mod); |
195 | } | |
196 | ||
6c9692e2 | 197 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
198 | { |
199 | struct latch_tree_node *ltn; | |
200 | ||
4f666546 | 201 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
202 | if (!ltn) |
203 | return NULL; | |
204 | ||
205 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
206 | } | |
207 | ||
6c9692e2 PZ |
208 | #else /* MODULES_TREE_LOOKUP */ |
209 | ||
4f666546 PZ |
210 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
211 | ||
6c9692e2 PZ |
212 | static void mod_tree_insert(struct module *mod) { } |
213 | static void mod_tree_remove_init(struct module *mod) { } | |
214 | static void mod_tree_remove(struct module *mod) { } | |
215 | ||
216 | static struct module *mod_find(unsigned long addr) | |
217 | { | |
218 | struct module *mod; | |
219 | ||
bf08949c MH |
220 | list_for_each_entry_rcu(mod, &modules, list, |
221 | lockdep_is_held(&module_mutex)) { | |
6c9692e2 PZ |
222 | if (within_module(addr, mod)) |
223 | return mod; | |
224 | } | |
225 | ||
226 | return NULL; | |
227 | } | |
228 | ||
229 | #endif /* MODULES_TREE_LOOKUP */ | |
230 | ||
4f666546 PZ |
231 | /* |
232 | * Bounds of module text, for speeding up __module_address. | |
233 | * Protected by module_mutex. | |
234 | */ | |
235 | static void __mod_update_bounds(void *base, unsigned int size) | |
236 | { | |
237 | unsigned long min = (unsigned long)base; | |
238 | unsigned long max = min + size; | |
239 | ||
240 | if (min < module_addr_min) | |
241 | module_addr_min = min; | |
242 | if (max > module_addr_max) | |
243 | module_addr_max = max; | |
244 | } | |
245 | ||
246 | static void mod_update_bounds(struct module *mod) | |
247 | { | |
7523e4dc RR |
248 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
249 | if (mod->init_layout.size) | |
250 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
251 | } |
252 | ||
67fc4e0c JW |
253 | #ifdef CONFIG_KGDB_KDB |
254 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
255 | #endif /* CONFIG_KGDB_KDB */ | |
256 | ||
0be964be PZ |
257 | static void module_assert_mutex(void) |
258 | { | |
259 | lockdep_assert_held(&module_mutex); | |
260 | } | |
261 | ||
262 | static void module_assert_mutex_or_preempt(void) | |
263 | { | |
264 | #ifdef CONFIG_LOCKDEP | |
265 | if (unlikely(!debug_locks)) | |
266 | return; | |
267 | ||
9502514f | 268 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
269 | !lockdep_is_held(&module_mutex)); |
270 | #endif | |
271 | } | |
272 | ||
6727bb9c | 273 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 274 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 275 | |
fda784e5 BM |
276 | /* |
277 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
278 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
279 | */ | |
280 | bool is_module_sig_enforced(void) | |
281 | { | |
282 | return sig_enforce; | |
283 | } | |
284 | EXPORT_SYMBOL(is_module_sig_enforced); | |
285 | ||
8db5da0b MZ |
286 | void set_module_sig_enforced(void) |
287 | { | |
288 | sig_enforce = true; | |
289 | } | |
290 | ||
19e4529e SR |
291 | /* Block module loading/unloading? */ |
292 | int modules_disabled = 0; | |
02608bef | 293 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 294 | |
c9a3ba55 RR |
295 | /* Waiting for a module to finish initializing? */ |
296 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
297 | ||
e041c683 | 298 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 299 | |
6da0b565 | 300 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 301 | { |
e041c683 | 302 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
303 | } |
304 | EXPORT_SYMBOL(register_module_notifier); | |
305 | ||
6da0b565 | 306 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 307 | { |
e041c683 | 308 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
309 | } |
310 | EXPORT_SYMBOL(unregister_module_notifier); | |
311 | ||
71d9f507 MB |
312 | /* |
313 | * We require a truly strong try_module_get(): 0 means success. | |
314 | * Otherwise an error is returned due to ongoing or failed | |
315 | * initialization etc. | |
316 | */ | |
1da177e4 LT |
317 | static inline int strong_try_module_get(struct module *mod) |
318 | { | |
0d21b0e3 | 319 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 320 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
321 | return -EBUSY; |
322 | if (try_module_get(mod)) | |
1da177e4 | 323 | return 0; |
c9a3ba55 RR |
324 | else |
325 | return -ENOENT; | |
1da177e4 LT |
326 | } |
327 | ||
373d4d09 RR |
328 | static inline void add_taint_module(struct module *mod, unsigned flag, |
329 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 330 | { |
373d4d09 | 331 | add_taint(flag, lockdep_ok); |
7fd8329b | 332 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
333 | } |
334 | ||
02a3e59a RD |
335 | /* |
336 | * A thread that wants to hold a reference to a module only while it | |
337 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 338 | */ |
bf262dce | 339 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
340 | { |
341 | module_put(mod); | |
342 | do_exit(code); | |
343 | } | |
344 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 345 | |
1da177e4 | 346 | /* Find a module section: 0 means not found. */ |
49668688 | 347 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
348 | { |
349 | unsigned int i; | |
350 | ||
49668688 RR |
351 | for (i = 1; i < info->hdr->e_shnum; i++) { |
352 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 353 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
354 | if ((shdr->sh_flags & SHF_ALLOC) |
355 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 356 | return i; |
49668688 | 357 | } |
1da177e4 LT |
358 | return 0; |
359 | } | |
360 | ||
5e458cc0 | 361 | /* Find a module section, or NULL. */ |
49668688 | 362 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
363 | { |
364 | /* Section 0 has sh_addr 0. */ | |
49668688 | 365 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
366 | } |
367 | ||
368 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 369 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
370 | const char *name, |
371 | size_t object_size, | |
372 | unsigned int *num) | |
373 | { | |
49668688 | 374 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
375 | |
376 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
377 | *num = info->sechdrs[sec].sh_size / object_size; |
378 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
379 | } |
380 | ||
1da177e4 LT |
381 | /* Provided by the linker */ |
382 | extern const struct kernel_symbol __start___ksymtab[]; | |
383 | extern const struct kernel_symbol __stop___ksymtab[]; | |
384 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
385 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
386 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
387 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
388 | extern const s32 __start___kcrctab[]; |
389 | extern const s32 __start___kcrctab_gpl[]; | |
390 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
391 | #ifdef CONFIG_UNUSED_SYMBOLS |
392 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
393 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
394 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
395 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
396 | extern const s32 __start___kcrctab_unused[]; |
397 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 398 | #endif |
1da177e4 LT |
399 | |
400 | #ifndef CONFIG_MODVERSIONS | |
401 | #define symversion(base, idx) NULL | |
402 | #else | |
f83ca9fe | 403 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
404 | #endif |
405 | ||
dafd0940 RR |
406 | static bool each_symbol_in_section(const struct symsearch *arr, |
407 | unsigned int arrsize, | |
408 | struct module *owner, | |
409 | bool (*fn)(const struct symsearch *syms, | |
410 | struct module *owner, | |
de4d8d53 | 411 | void *data), |
dafd0940 | 412 | void *data) |
ad9546c9 | 413 | { |
de4d8d53 | 414 | unsigned int j; |
ad9546c9 | 415 | |
dafd0940 | 416 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
417 | if (fn(&arr[j], owner, data)) |
418 | return true; | |
f71d20e9 | 419 | } |
dafd0940 RR |
420 | |
421 | return false; | |
ad9546c9 RR |
422 | } |
423 | ||
dafd0940 | 424 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
425 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
426 | struct module *owner, | |
427 | void *data), | |
428 | void *data) | |
ad9546c9 RR |
429 | { |
430 | struct module *mod; | |
44032e63 | 431 | static const struct symsearch arr[] = { |
ad9546c9 | 432 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 433 | NOT_GPL_ONLY, false }, |
ad9546c9 | 434 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
435 | __start___kcrctab_gpl, |
436 | GPL_ONLY, false }, | |
ad9546c9 | 437 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
438 | __start___kcrctab_gpl_future, |
439 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 440 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 441 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
442 | __start___kcrctab_unused, |
443 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 444 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
445 | __start___kcrctab_unused_gpl, |
446 | GPL_ONLY, true }, | |
f7f5b675 | 447 | #endif |
ad9546c9 | 448 | }; |
f71d20e9 | 449 | |
0be964be PZ |
450 | module_assert_mutex_or_preempt(); |
451 | ||
dafd0940 RR |
452 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
453 | return true; | |
f71d20e9 | 454 | |
bf08949c MH |
455 | list_for_each_entry_rcu(mod, &modules, list, |
456 | lockdep_is_held(&module_mutex)) { | |
ad9546c9 RR |
457 | struct symsearch arr[] = { |
458 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 459 | NOT_GPL_ONLY, false }, |
ad9546c9 | 460 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
461 | mod->gpl_crcs, |
462 | GPL_ONLY, false }, | |
ad9546c9 RR |
463 | { mod->gpl_future_syms, |
464 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
465 | mod->gpl_future_crcs, |
466 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 467 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
468 | { mod->unused_syms, |
469 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
470 | mod->unused_crcs, |
471 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
472 | { mod->unused_gpl_syms, |
473 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
474 | mod->unused_gpl_crcs, |
475 | GPL_ONLY, true }, | |
f7f5b675 | 476 | #endif |
ad9546c9 RR |
477 | }; |
478 | ||
0d21b0e3 RR |
479 | if (mod->state == MODULE_STATE_UNFORMED) |
480 | continue; | |
481 | ||
dafd0940 RR |
482 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
483 | return true; | |
484 | } | |
485 | return false; | |
486 | } | |
de4d8d53 | 487 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
488 | |
489 | struct find_symbol_arg { | |
490 | /* Input */ | |
491 | const char *name; | |
492 | bool gplok; | |
493 | bool warn; | |
494 | ||
495 | /* Output */ | |
496 | struct module *owner; | |
71810db2 | 497 | const s32 *crc; |
414fd31b | 498 | const struct kernel_symbol *sym; |
dafd0940 RR |
499 | }; |
500 | ||
2d25bc55 JY |
501 | static bool check_exported_symbol(const struct symsearch *syms, |
502 | struct module *owner, | |
503 | unsigned int symnum, void *data) | |
dafd0940 RR |
504 | { |
505 | struct find_symbol_arg *fsa = data; | |
506 | ||
dafd0940 RR |
507 | if (!fsa->gplok) { |
508 | if (syms->licence == GPL_ONLY) | |
509 | return false; | |
510 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
511 | pr_warn("Symbol %s is being used by a non-GPL module, " |
512 | "which will not be allowed in the future\n", | |
513 | fsa->name); | |
9f28bb7e | 514 | } |
1da177e4 | 515 | } |
ad9546c9 | 516 | |
f7f5b675 | 517 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 518 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
519 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
520 | "using it.\n", fsa->name); | |
521 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
522 | pr_warn("Please evaluate if this is the right api to use and " |
523 | "if it really is, submit a report to the linux kernel " | |
524 | "mailing list together with submitting your code for " | |
bddb12b3 | 525 | "inclusion.\n"); |
dafd0940 | 526 | } |
f7f5b675 | 527 | #endif |
dafd0940 RR |
528 | |
529 | fsa->owner = owner; | |
530 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 531 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
532 | return true; |
533 | } | |
534 | ||
7290d580 AB |
535 | static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
536 | { | |
537 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
538 | return (unsigned long)offset_to_ptr(&sym->value_offset); | |
539 | #else | |
540 | return sym->value; | |
541 | #endif | |
542 | } | |
543 | ||
544 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) | |
545 | { | |
546 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
547 | return offset_to_ptr(&sym->name_offset); | |
548 | #else | |
549 | return sym->name; | |
550 | #endif | |
551 | } | |
552 | ||
8651ec01 MM |
553 | static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
554 | { | |
555 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
069e1c07 WD |
556 | if (!sym->namespace_offset) |
557 | return NULL; | |
8651ec01 MM |
558 | return offset_to_ptr(&sym->namespace_offset); |
559 | #else | |
560 | return sym->namespace; | |
561 | #endif | |
562 | } | |
563 | ||
b605be65 | 564 | static int cmp_name(const void *name, const void *sym) |
403ed278 | 565 | { |
b605be65 | 566 | return strcmp(name, kernel_symbol_name(sym)); |
403ed278 AIB |
567 | } |
568 | ||
2d25bc55 JY |
569 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
570 | struct module *owner, | |
571 | void *data) | |
de4d8d53 RR |
572 | { |
573 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
574 | struct kernel_symbol *sym; |
575 | ||
576 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
577 | sizeof(struct kernel_symbol), cmp_name); | |
578 | ||
2d25bc55 JY |
579 | if (sym != NULL && check_exported_symbol(syms, owner, |
580 | sym - syms->start, data)) | |
403ed278 | 581 | return true; |
de4d8d53 | 582 | |
de4d8d53 RR |
583 | return false; |
584 | } | |
585 | ||
2d25bc55 | 586 | /* Find an exported symbol and return it, along with, (optional) crc and |
75676500 | 587 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
588 | const struct kernel_symbol *find_symbol(const char *name, |
589 | struct module **owner, | |
71810db2 | 590 | const s32 **crc, |
c6b37801 TA |
591 | bool gplok, |
592 | bool warn) | |
dafd0940 RR |
593 | { |
594 | struct find_symbol_arg fsa; | |
595 | ||
596 | fsa.name = name; | |
597 | fsa.gplok = gplok; | |
598 | fsa.warn = warn; | |
599 | ||
2d25bc55 | 600 | if (each_symbol_section(find_exported_symbol_in_section, &fsa)) { |
dafd0940 RR |
601 | if (owner) |
602 | *owner = fsa.owner; | |
603 | if (crc) | |
604 | *crc = fsa.crc; | |
414fd31b | 605 | return fsa.sym; |
dafd0940 RR |
606 | } |
607 | ||
5e124169 | 608 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 609 | return NULL; |
1da177e4 | 610 | } |
c6b37801 | 611 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 612 | |
fe0d34d2 RR |
613 | /* |
614 | * Search for module by name: must hold module_mutex (or preempt disabled | |
615 | * for read-only access). | |
616 | */ | |
4f6de4d5 | 617 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 618 | bool even_unformed) |
1da177e4 LT |
619 | { |
620 | struct module *mod; | |
621 | ||
fe0d34d2 | 622 | module_assert_mutex_or_preempt(); |
0be964be | 623 | |
bf08949c MH |
624 | list_for_each_entry_rcu(mod, &modules, list, |
625 | lockdep_is_held(&module_mutex)) { | |
0d21b0e3 RR |
626 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
627 | continue; | |
4f6de4d5 | 628 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
629 | return mod; |
630 | } | |
631 | return NULL; | |
632 | } | |
0d21b0e3 RR |
633 | |
634 | struct module *find_module(const char *name) | |
635 | { | |
fe0d34d2 | 636 | module_assert_mutex(); |
4f6de4d5 | 637 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 638 | } |
c6b37801 | 639 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
640 | |
641 | #ifdef CONFIG_SMP | |
fbf59bc9 | 642 | |
259354de | 643 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 644 | { |
259354de TH |
645 | return mod->percpu; |
646 | } | |
fbf59bc9 | 647 | |
9eb76d77 | 648 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 649 | { |
9eb76d77 RR |
650 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
651 | unsigned long align = pcpusec->sh_addralign; | |
652 | ||
653 | if (!pcpusec->sh_size) | |
654 | return 0; | |
655 | ||
fbf59bc9 | 656 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
657 | pr_warn("%s: per-cpu alignment %li > %li\n", |
658 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
659 | align = PAGE_SIZE; |
660 | } | |
661 | ||
9eb76d77 | 662 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 663 | if (!mod->percpu) { |
bddb12b3 AM |
664 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
665 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
666 | return -ENOMEM; |
667 | } | |
9eb76d77 | 668 | mod->percpu_size = pcpusec->sh_size; |
259354de | 669 | return 0; |
fbf59bc9 TH |
670 | } |
671 | ||
259354de | 672 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 673 | { |
259354de | 674 | free_percpu(mod->percpu); |
fbf59bc9 TH |
675 | } |
676 | ||
49668688 | 677 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 678 | { |
49668688 | 679 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
680 | } |
681 | ||
259354de TH |
682 | static void percpu_modcopy(struct module *mod, |
683 | const void *from, unsigned long size) | |
6b588c18 TH |
684 | { |
685 | int cpu; | |
686 | ||
687 | for_each_possible_cpu(cpu) | |
259354de | 688 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
689 | } |
690 | ||
383776fa | 691 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
692 | { |
693 | struct module *mod; | |
694 | unsigned int cpu; | |
695 | ||
696 | preempt_disable(); | |
697 | ||
698 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
699 | if (mod->state == MODULE_STATE_UNFORMED) |
700 | continue; | |
10fad5e4 TH |
701 | if (!mod->percpu_size) |
702 | continue; | |
703 | for_each_possible_cpu(cpu) { | |
704 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 705 | void *va = (void *)addr; |
10fad5e4 | 706 | |
383776fa | 707 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 708 | if (can_addr) { |
383776fa | 709 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
710 | *can_addr += (unsigned long) |
711 | per_cpu_ptr(mod->percpu, | |
712 | get_boot_cpu_id()); | |
713 | } | |
10fad5e4 TH |
714 | preempt_enable(); |
715 | return true; | |
716 | } | |
717 | } | |
718 | } | |
719 | ||
720 | preempt_enable(); | |
721 | return false; | |
6b588c18 TH |
722 | } |
723 | ||
383776fa TG |
724 | /** |
725 | * is_module_percpu_address - test whether address is from module static percpu | |
726 | * @addr: address to test | |
727 | * | |
728 | * Test whether @addr belongs to module static percpu area. | |
729 | * | |
730 | * RETURNS: | |
731 | * %true if @addr is from module static percpu area | |
732 | */ | |
733 | bool is_module_percpu_address(unsigned long addr) | |
734 | { | |
735 | return __is_module_percpu_address(addr, NULL); | |
736 | } | |
737 | ||
1da177e4 | 738 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 739 | |
259354de | 740 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
741 | { |
742 | return NULL; | |
743 | } | |
9eb76d77 | 744 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 745 | { |
9eb76d77 RR |
746 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
747 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
748 | return -ENOMEM; | |
749 | return 0; | |
259354de TH |
750 | } |
751 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 752 | { |
1da177e4 | 753 | } |
49668688 | 754 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
755 | { |
756 | return 0; | |
757 | } | |
259354de TH |
758 | static inline void percpu_modcopy(struct module *mod, |
759 | const void *from, unsigned long size) | |
1da177e4 LT |
760 | { |
761 | /* pcpusec should be 0, and size of that section should be 0. */ | |
762 | BUG_ON(size != 0); | |
763 | } | |
10fad5e4 TH |
764 | bool is_module_percpu_address(unsigned long addr) |
765 | { | |
766 | return false; | |
767 | } | |
6b588c18 | 768 | |
383776fa TG |
769 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
770 | { | |
771 | return false; | |
772 | } | |
773 | ||
1da177e4 LT |
774 | #endif /* CONFIG_SMP */ |
775 | ||
c988d2b2 MD |
776 | #define MODINFO_ATTR(field) \ |
777 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
778 | { \ | |
779 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
780 | } \ | |
781 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 782 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 783 | { \ |
cc56ded3 | 784 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
785 | } \ |
786 | static int modinfo_##field##_exists(struct module *mod) \ | |
787 | { \ | |
788 | return mod->field != NULL; \ | |
789 | } \ | |
790 | static void free_modinfo_##field(struct module *mod) \ | |
791 | { \ | |
22a8bdeb DW |
792 | kfree(mod->field); \ |
793 | mod->field = NULL; \ | |
c988d2b2 MD |
794 | } \ |
795 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 796 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
797 | .show = show_modinfo_##field, \ |
798 | .setup = setup_modinfo_##field, \ | |
799 | .test = modinfo_##field##_exists, \ | |
800 | .free = free_modinfo_##field, \ | |
801 | }; | |
802 | ||
803 | MODINFO_ATTR(version); | |
804 | MODINFO_ATTR(srcversion); | |
805 | ||
e14af7ee AV |
806 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
807 | ||
03e88ae1 | 808 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
809 | |
810 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
811 | ||
e513cc1c MH |
812 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
813 | #define MODULE_REF_BASE 1 | |
814 | ||
1da177e4 | 815 | /* Init the unload section of the module. */ |
9f85a4bb | 816 | static int module_unload_init(struct module *mod) |
1da177e4 | 817 | { |
e513cc1c MH |
818 | /* |
819 | * Initialize reference counter to MODULE_REF_BASE. | |
820 | * refcnt == 0 means module is going. | |
821 | */ | |
822 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 823 | |
2c02dfe7 LT |
824 | INIT_LIST_HEAD(&mod->source_list); |
825 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 826 | |
1da177e4 | 827 | /* Hold reference count during initialization. */ |
e513cc1c | 828 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
829 | |
830 | return 0; | |
1da177e4 LT |
831 | } |
832 | ||
1da177e4 LT |
833 | /* Does a already use b? */ |
834 | static int already_uses(struct module *a, struct module *b) | |
835 | { | |
836 | struct module_use *use; | |
837 | ||
2c02dfe7 LT |
838 | list_for_each_entry(use, &b->source_list, source_list) { |
839 | if (use->source == a) { | |
5e124169 | 840 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
841 | return 1; |
842 | } | |
843 | } | |
5e124169 | 844 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
845 | return 0; |
846 | } | |
847 | ||
2c02dfe7 LT |
848 | /* |
849 | * Module a uses b | |
850 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
851 | * - the module_use is added to the list of 'b' sources (so | |
852 | * 'b' can walk the list to see who sourced them), and of 'a' | |
853 | * targets (so 'a' can see what modules it targets). | |
854 | */ | |
855 | static int add_module_usage(struct module *a, struct module *b) | |
856 | { | |
2c02dfe7 LT |
857 | struct module_use *use; |
858 | ||
5e124169 | 859 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 860 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 861 | if (!use) |
2c02dfe7 | 862 | return -ENOMEM; |
2c02dfe7 LT |
863 | |
864 | use->source = a; | |
865 | use->target = b; | |
866 | list_add(&use->source_list, &b->source_list); | |
867 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
868 | return 0; |
869 | } | |
870 | ||
75676500 | 871 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 872 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 873 | { |
c8e21ced | 874 | int err; |
270a6c4c | 875 | |
9bea7f23 | 876 | if (b == NULL || already_uses(a, b)) |
218ce735 | 877 | return 0; |
218ce735 | 878 | |
9bea7f23 RR |
879 | /* If module isn't available, we fail. */ |
880 | err = strong_try_module_get(b); | |
c9a3ba55 | 881 | if (err) |
9bea7f23 | 882 | return err; |
1da177e4 | 883 | |
2c02dfe7 LT |
884 | err = add_module_usage(a, b); |
885 | if (err) { | |
1da177e4 | 886 | module_put(b); |
9bea7f23 | 887 | return err; |
1da177e4 | 888 | } |
9bea7f23 | 889 | return 0; |
1da177e4 | 890 | } |
9bea7f23 | 891 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
892 | |
893 | /* Clear the unload stuff of the module. */ | |
894 | static void module_unload_free(struct module *mod) | |
895 | { | |
2c02dfe7 | 896 | struct module_use *use, *tmp; |
1da177e4 | 897 | |
75676500 | 898 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
899 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
900 | struct module *i = use->target; | |
5e124169 | 901 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
902 | module_put(i); |
903 | list_del(&use->source_list); | |
904 | list_del(&use->target_list); | |
905 | kfree(use); | |
1da177e4 | 906 | } |
75676500 | 907 | mutex_unlock(&module_mutex); |
1da177e4 LT |
908 | } |
909 | ||
910 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 911 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
912 | { |
913 | int ret = (flags & O_TRUNC); | |
914 | if (ret) | |
373d4d09 | 915 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
916 | return ret; |
917 | } | |
918 | #else | |
fb169793 | 919 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
920 | { |
921 | return 0; | |
922 | } | |
923 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
924 | ||
e513cc1c MH |
925 | /* Try to release refcount of module, 0 means success. */ |
926 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 927 | { |
e513cc1c | 928 | int ret; |
1da177e4 | 929 | |
e513cc1c MH |
930 | /* Try to decrement refcnt which we set at loading */ |
931 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
932 | BUG_ON(ret < 0); | |
933 | if (ret) | |
934 | /* Someone can put this right now, recover with checking */ | |
935 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 936 | |
e513cc1c MH |
937 | return ret; |
938 | } | |
1da177e4 | 939 | |
e513cc1c MH |
940 | static int try_stop_module(struct module *mod, int flags, int *forced) |
941 | { | |
da39ba5e | 942 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
943 | if (try_release_module_ref(mod) != 0) { |
944 | *forced = try_force_unload(flags); | |
945 | if (!(*forced)) | |
1da177e4 LT |
946 | return -EWOULDBLOCK; |
947 | } | |
948 | ||
949 | /* Mark it as dying. */ | |
e513cc1c | 950 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 951 | |
e513cc1c | 952 | return 0; |
1da177e4 LT |
953 | } |
954 | ||
d5db139a RR |
955 | /** |
956 | * module_refcount - return the refcount or -1 if unloading | |
957 | * | |
958 | * @mod: the module we're checking | |
959 | * | |
960 | * Returns: | |
961 | * -1 if the module is in the process of unloading | |
962 | * otherwise the number of references in the kernel to the module | |
963 | */ | |
964 | int module_refcount(struct module *mod) | |
1da177e4 | 965 | { |
d5db139a | 966 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
967 | } |
968 | EXPORT_SYMBOL(module_refcount); | |
969 | ||
970 | /* This exists whether we can unload or not */ | |
971 | static void free_module(struct module *mod); | |
972 | ||
17da2bd9 HC |
973 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
974 | unsigned int, flags) | |
1da177e4 LT |
975 | { |
976 | struct module *mod; | |
dfff0a06 | 977 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
978 | int ret, forced = 0; |
979 | ||
3d43321b | 980 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
981 | return -EPERM; |
982 | ||
983 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
984 | return -EFAULT; | |
985 | name[MODULE_NAME_LEN-1] = '\0'; | |
986 | ||
f6276ac9 RGB |
987 | audit_log_kern_module(name); |
988 | ||
3fc1f1e2 TH |
989 | if (mutex_lock_interruptible(&module_mutex) != 0) |
990 | return -EINTR; | |
1da177e4 LT |
991 | |
992 | mod = find_module(name); | |
993 | if (!mod) { | |
994 | ret = -ENOENT; | |
995 | goto out; | |
996 | } | |
997 | ||
2c02dfe7 | 998 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
999 | /* Other modules depend on us: get rid of them first. */ |
1000 | ret = -EWOULDBLOCK; | |
1001 | goto out; | |
1002 | } | |
1003 | ||
1004 | /* Doing init or already dying? */ | |
1005 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 1006 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 1007 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
1008 | ret = -EBUSY; |
1009 | goto out; | |
1010 | } | |
1011 | ||
1012 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 1013 | if (mod->init && !mod->exit) { |
fb169793 | 1014 | forced = try_force_unload(flags); |
1da177e4 LT |
1015 | if (!forced) { |
1016 | /* This module can't be removed */ | |
1017 | ret = -EBUSY; | |
1018 | goto out; | |
1019 | } | |
1020 | } | |
1021 | ||
1da177e4 LT |
1022 | /* Stop the machine so refcounts can't move and disable module. */ |
1023 | ret = try_stop_module(mod, flags, &forced); | |
1024 | if (ret != 0) | |
1025 | goto out; | |
1026 | ||
df4b565e | 1027 | mutex_unlock(&module_mutex); |
25985edc | 1028 | /* Final destruction now no one is using it. */ |
df4b565e | 1029 | if (mod->exit != NULL) |
1da177e4 | 1030 | mod->exit(); |
df4b565e PO |
1031 | blocking_notifier_call_chain(&module_notify_list, |
1032 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1033 | klp_module_going(mod); |
7dcd182b JY |
1034 | ftrace_release_mod(mod); |
1035 | ||
22a9d645 | 1036 | async_synchronize_full(); |
75676500 | 1037 | |
e14af7ee | 1038 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1039 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1040 | |
75676500 | 1041 | free_module(mod); |
5d603311 KK |
1042 | /* someone could wait for the module in add_unformed_module() */ |
1043 | wake_up_all(&module_wq); | |
75676500 RR |
1044 | return 0; |
1045 | out: | |
6389a385 | 1046 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1047 | return ret; |
1048 | } | |
1049 | ||
d1e99d7a | 1050 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1051 | { |
1052 | struct module_use *use; | |
1053 | int printed_something = 0; | |
1054 | ||
d5db139a | 1055 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1056 | |
6da0b565 IA |
1057 | /* |
1058 | * Always include a trailing , so userspace can differentiate | |
1059 | * between this and the old multi-field proc format. | |
1060 | */ | |
2c02dfe7 | 1061 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1062 | printed_something = 1; |
2c02dfe7 | 1063 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1064 | } |
1065 | ||
1da177e4 LT |
1066 | if (mod->init != NULL && mod->exit == NULL) { |
1067 | printed_something = 1; | |
6da0b565 | 1068 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1069 | } |
1070 | ||
1071 | if (!printed_something) | |
6da0b565 | 1072 | seq_puts(m, "-"); |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | void __symbol_put(const char *symbol) | |
1076 | { | |
1077 | struct module *owner; | |
1da177e4 | 1078 | |
24da1cbf | 1079 | preempt_disable(); |
414fd31b | 1080 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1081 | BUG(); |
1082 | module_put(owner); | |
24da1cbf | 1083 | preempt_enable(); |
1da177e4 LT |
1084 | } |
1085 | EXPORT_SYMBOL(__symbol_put); | |
1086 | ||
7d1d16e4 | 1087 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1088 | void symbol_put_addr(void *addr) |
1089 | { | |
5e376613 | 1090 | struct module *modaddr; |
7d1d16e4 | 1091 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1092 | |
7d1d16e4 | 1093 | if (core_kernel_text(a)) |
5e376613 | 1094 | return; |
1da177e4 | 1095 | |
275d7d44 PZ |
1096 | /* |
1097 | * Even though we hold a reference on the module; we still need to | |
1098 | * disable preemption in order to safely traverse the data structure. | |
1099 | */ | |
1100 | preempt_disable(); | |
7d1d16e4 | 1101 | modaddr = __module_text_address(a); |
a6e6abd5 | 1102 | BUG_ON(!modaddr); |
5e376613 | 1103 | module_put(modaddr); |
275d7d44 | 1104 | preempt_enable(); |
1da177e4 LT |
1105 | } |
1106 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1107 | ||
1108 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1109 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1110 | { |
d5db139a | 1111 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1112 | } |
1113 | ||
cca3e707 KS |
1114 | static struct module_attribute modinfo_refcnt = |
1115 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1116 | |
d53799be SR |
1117 | void __module_get(struct module *module) |
1118 | { | |
1119 | if (module) { | |
1120 | preempt_disable(); | |
2f35c41f | 1121 | atomic_inc(&module->refcnt); |
d53799be SR |
1122 | trace_module_get(module, _RET_IP_); |
1123 | preempt_enable(); | |
1124 | } | |
1125 | } | |
1126 | EXPORT_SYMBOL(__module_get); | |
1127 | ||
1128 | bool try_module_get(struct module *module) | |
1129 | { | |
1130 | bool ret = true; | |
1131 | ||
1132 | if (module) { | |
1133 | preempt_disable(); | |
e513cc1c MH |
1134 | /* Note: here, we can fail to get a reference */ |
1135 | if (likely(module_is_live(module) && | |
1136 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1137 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1138 | else |
d53799be SR |
1139 | ret = false; |
1140 | ||
1141 | preempt_enable(); | |
1142 | } | |
1143 | return ret; | |
1144 | } | |
1145 | EXPORT_SYMBOL(try_module_get); | |
1146 | ||
f6a57033 AV |
1147 | void module_put(struct module *module) |
1148 | { | |
e513cc1c MH |
1149 | int ret; |
1150 | ||
f6a57033 | 1151 | if (module) { |
e1783a24 | 1152 | preempt_disable(); |
e513cc1c MH |
1153 | ret = atomic_dec_if_positive(&module->refcnt); |
1154 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1155 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1156 | preempt_enable(); |
f6a57033 AV |
1157 | } |
1158 | } | |
1159 | EXPORT_SYMBOL(module_put); | |
1160 | ||
1da177e4 | 1161 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1162 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1163 | { |
1164 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1165 | seq_puts(m, " - -"); |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | static inline void module_unload_free(struct module *mod) | |
1169 | { | |
1170 | } | |
1171 | ||
9bea7f23 | 1172 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1173 | { |
9bea7f23 | 1174 | return strong_try_module_get(b); |
1da177e4 | 1175 | } |
9bea7f23 | 1176 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1177 | |
9f85a4bb | 1178 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1179 | { |
9f85a4bb | 1180 | return 0; |
1da177e4 LT |
1181 | } |
1182 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1183 | ||
53999bf3 KW |
1184 | static size_t module_flags_taint(struct module *mod, char *buf) |
1185 | { | |
1186 | size_t l = 0; | |
7fd8329b PM |
1187 | int i; |
1188 | ||
1189 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1190 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1191 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1192 | } |
53999bf3 | 1193 | |
53999bf3 KW |
1194 | return l; |
1195 | } | |
1196 | ||
1f71740a | 1197 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1198 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1199 | { |
1200 | const char *state = "unknown"; | |
1201 | ||
4befb026 | 1202 | switch (mk->mod->state) { |
1f71740a KS |
1203 | case MODULE_STATE_LIVE: |
1204 | state = "live"; | |
1205 | break; | |
1206 | case MODULE_STATE_COMING: | |
1207 | state = "coming"; | |
1208 | break; | |
1209 | case MODULE_STATE_GOING: | |
1210 | state = "going"; | |
1211 | break; | |
0d21b0e3 RR |
1212 | default: |
1213 | BUG(); | |
1f71740a KS |
1214 | } |
1215 | return sprintf(buffer, "%s\n", state); | |
1216 | } | |
1217 | ||
cca3e707 KS |
1218 | static struct module_attribute modinfo_initstate = |
1219 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1220 | |
88bfa324 KS |
1221 | static ssize_t store_uevent(struct module_attribute *mattr, |
1222 | struct module_kobject *mk, | |
1223 | const char *buffer, size_t count) | |
1224 | { | |
df44b479 PR |
1225 | int rc; |
1226 | ||
1227 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1228 | return rc ? rc : count; | |
88bfa324 KS |
1229 | } |
1230 | ||
cca3e707 KS |
1231 | struct module_attribute module_uevent = |
1232 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1233 | ||
1234 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1235 | struct module_kobject *mk, char *buffer) | |
1236 | { | |
7523e4dc | 1237 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1238 | } |
1239 | ||
1240 | static struct module_attribute modinfo_coresize = | |
1241 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1242 | ||
1243 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1244 | struct module_kobject *mk, char *buffer) | |
1245 | { | |
7523e4dc | 1246 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1247 | } |
1248 | ||
1249 | static struct module_attribute modinfo_initsize = | |
1250 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1251 | ||
1252 | static ssize_t show_taint(struct module_attribute *mattr, | |
1253 | struct module_kobject *mk, char *buffer) | |
1254 | { | |
1255 | size_t l; | |
1256 | ||
1257 | l = module_flags_taint(mk->mod, buffer); | |
1258 | buffer[l++] = '\n'; | |
1259 | return l; | |
1260 | } | |
1261 | ||
1262 | static struct module_attribute modinfo_taint = | |
1263 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1264 | |
03e88ae1 | 1265 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1266 | &module_uevent, |
03e88ae1 GKH |
1267 | &modinfo_version, |
1268 | &modinfo_srcversion, | |
cca3e707 KS |
1269 | &modinfo_initstate, |
1270 | &modinfo_coresize, | |
1271 | &modinfo_initsize, | |
1272 | &modinfo_taint, | |
03e88ae1 | 1273 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1274 | &modinfo_refcnt, |
03e88ae1 GKH |
1275 | #endif |
1276 | NULL, | |
1277 | }; | |
1278 | ||
1da177e4 LT |
1279 | static const char vermagic[] = VERMAGIC_STRING; |
1280 | ||
c6e665c8 | 1281 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1282 | { |
1283 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1284 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1285 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1286 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1287 | return 0; |
1288 | #else | |
1289 | return -ENOEXEC; | |
1290 | #endif | |
1291 | } | |
1292 | ||
1da177e4 | 1293 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1294 | |
1295 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1296 | { |
71810db2 | 1297 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1298 | } |
1299 | ||
49019426 | 1300 | static int check_version(const struct load_info *info, |
1da177e4 | 1301 | const char *symname, |
6da0b565 | 1302 | struct module *mod, |
71810db2 | 1303 | const s32 *crc) |
1da177e4 | 1304 | { |
49019426 KC |
1305 | Elf_Shdr *sechdrs = info->sechdrs; |
1306 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1307 | unsigned int i, num_versions; |
1308 | struct modversion_info *versions; | |
1309 | ||
1310 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1311 | if (!crc) | |
1312 | return 1; | |
1313 | ||
a5dd6970 RR |
1314 | /* No versions at all? modprobe --force does this. */ |
1315 | if (versindex == 0) | |
1316 | return try_to_force_load(mod, symname) == 0; | |
1317 | ||
1da177e4 LT |
1318 | versions = (void *) sechdrs[versindex].sh_addr; |
1319 | num_versions = sechdrs[versindex].sh_size | |
1320 | / sizeof(struct modversion_info); | |
1321 | ||
1322 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1323 | u32 crcval; |
1324 | ||
1da177e4 LT |
1325 | if (strcmp(versions[i].name, symname) != 0) |
1326 | continue; | |
1327 | ||
71810db2 AB |
1328 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1329 | crcval = resolve_rel_crc(crc); | |
1330 | else | |
1331 | crcval = *crc; | |
1332 | if (versions[i].crc == crcval) | |
1da177e4 | 1333 | return 1; |
71810db2 AB |
1334 | pr_debug("Found checksum %X vs module %lX\n", |
1335 | crcval, versions[i].crc); | |
826e4506 | 1336 | goto bad_version; |
1da177e4 | 1337 | } |
826e4506 | 1338 | |
faaae2a5 | 1339 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1340 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1341 | return 1; |
826e4506 LT |
1342 | |
1343 | bad_version: | |
6da0b565 | 1344 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1345 | info->name, symname); |
826e4506 | 1346 | return 0; |
1da177e4 LT |
1347 | } |
1348 | ||
49019426 | 1349 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1350 | struct module *mod) |
1351 | { | |
71810db2 | 1352 | const s32 *crc; |
1da177e4 | 1353 | |
926a59b1 PZ |
1354 | /* |
1355 | * Since this should be found in kernel (which can't be removed), no | |
1356 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1357 | */ | |
1358 | preempt_disable(); | |
996302c5 | 1359 | if (!find_symbol("module_layout", NULL, &crc, true, false)) { |
926a59b1 | 1360 | preempt_enable(); |
1da177e4 | 1361 | BUG(); |
926a59b1 PZ |
1362 | } |
1363 | preempt_enable(); | |
996302c5 | 1364 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1365 | } |
1366 | ||
91e37a79 RR |
1367 | /* First part is kernel version, which we ignore if module has crcs. */ |
1368 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1369 | bool has_crcs) | |
1da177e4 | 1370 | { |
91e37a79 RR |
1371 | if (has_crcs) { |
1372 | amagic += strcspn(amagic, " "); | |
1373 | bmagic += strcspn(bmagic, " "); | |
1374 | } | |
1da177e4 LT |
1375 | return strcmp(amagic, bmagic) == 0; |
1376 | } | |
1377 | #else | |
49019426 | 1378 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1379 | const char *symname, |
6da0b565 | 1380 | struct module *mod, |
71810db2 | 1381 | const s32 *crc) |
1da177e4 LT |
1382 | { |
1383 | return 1; | |
1384 | } | |
1385 | ||
49019426 | 1386 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1387 | struct module *mod) |
1388 | { | |
1389 | return 1; | |
1390 | } | |
1391 | ||
91e37a79 RR |
1392 | static inline int same_magic(const char *amagic, const char *bmagic, |
1393 | bool has_crcs) | |
1da177e4 LT |
1394 | { |
1395 | return strcmp(amagic, bmagic) == 0; | |
1396 | } | |
1397 | #endif /* CONFIG_MODVERSIONS */ | |
1398 | ||
8651ec01 MM |
1399 | static char *get_modinfo(const struct load_info *info, const char *tag); |
1400 | static char *get_next_modinfo(const struct load_info *info, const char *tag, | |
1401 | char *prev); | |
1402 | ||
1403 | static int verify_namespace_is_imported(const struct load_info *info, | |
1404 | const struct kernel_symbol *sym, | |
1405 | struct module *mod) | |
1406 | { | |
1407 | const char *namespace; | |
1408 | char *imported_namespace; | |
1409 | ||
1410 | namespace = kernel_symbol_namespace(sym); | |
c3a6cf19 | 1411 | if (namespace && namespace[0]) { |
8651ec01 MM |
1412 | imported_namespace = get_modinfo(info, "import_ns"); |
1413 | while (imported_namespace) { | |
1414 | if (strcmp(namespace, imported_namespace) == 0) | |
1415 | return 0; | |
1416 | imported_namespace = get_next_modinfo( | |
1417 | info, "import_ns", imported_namespace); | |
1418 | } | |
3d52ec5e MM |
1419 | #ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
1420 | pr_warn( | |
1421 | #else | |
1422 | pr_err( | |
1423 | #endif | |
1424 | "%s: module uses symbol (%s) from namespace %s, but does not import it.\n", | |
1425 | mod->name, kernel_symbol_name(sym), namespace); | |
1426 | #ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS | |
8651ec01 | 1427 | return -EINVAL; |
3d52ec5e | 1428 | #endif |
8651ec01 MM |
1429 | } |
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | ||
75676500 | 1434 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1435 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1436 | const struct load_info *info, | |
414fd31b | 1437 | const char *name, |
9bea7f23 | 1438 | char ownername[]) |
1da177e4 LT |
1439 | { |
1440 | struct module *owner; | |
414fd31b | 1441 | const struct kernel_symbol *sym; |
71810db2 | 1442 | const s32 *crc; |
9bea7f23 | 1443 | int err; |
1da177e4 | 1444 | |
d64810f5 PZ |
1445 | /* |
1446 | * The module_mutex should not be a heavily contended lock; | |
1447 | * if we get the occasional sleep here, we'll go an extra iteration | |
1448 | * in the wait_event_interruptible(), which is harmless. | |
1449 | */ | |
1450 | sched_annotate_sleep(); | |
75676500 | 1451 | mutex_lock(&module_mutex); |
414fd31b | 1452 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1453 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1454 | if (!sym) |
1455 | goto unlock; | |
1456 | ||
49019426 | 1457 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1458 | sym = ERR_PTR(-EINVAL); |
1459 | goto getname; | |
1da177e4 | 1460 | } |
9bea7f23 | 1461 | |
8651ec01 MM |
1462 | err = verify_namespace_is_imported(info, sym, mod); |
1463 | if (err) { | |
1464 | sym = ERR_PTR(err); | |
1465 | goto getname; | |
1466 | } | |
1467 | ||
9bea7f23 RR |
1468 | err = ref_module(mod, owner); |
1469 | if (err) { | |
1470 | sym = ERR_PTR(err); | |
1471 | goto getname; | |
1472 | } | |
1473 | ||
1474 | getname: | |
1475 | /* We must make copy under the lock if we failed to get ref. */ | |
1476 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1477 | unlock: | |
75676500 | 1478 | mutex_unlock(&module_mutex); |
218ce735 | 1479 | return sym; |
1da177e4 LT |
1480 | } |
1481 | ||
49668688 RR |
1482 | static const struct kernel_symbol * |
1483 | resolve_symbol_wait(struct module *mod, | |
1484 | const struct load_info *info, | |
1485 | const char *name) | |
9bea7f23 RR |
1486 | { |
1487 | const struct kernel_symbol *ksym; | |
49668688 | 1488 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1489 | |
1490 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1491 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1492 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1493 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1494 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1495 | mod->name, owner); | |
9bea7f23 RR |
1496 | } |
1497 | return ksym; | |
1498 | } | |
1499 | ||
1da177e4 LT |
1500 | /* |
1501 | * /sys/module/foo/sections stuff | |
1502 | * J. Corbet <corbet@lwn.net> | |
1503 | */ | |
8f6d0378 | 1504 | #ifdef CONFIG_SYSFS |
10b465aa | 1505 | |
8f6d0378 | 1506 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1507 | static inline bool sect_empty(const Elf_Shdr *sect) |
1508 | { | |
1509 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1510 | } | |
1511 | ||
6da0b565 | 1512 | struct module_sect_attr { |
ed66f991 | 1513 | struct bin_attribute battr; |
a58730c4 RR |
1514 | unsigned long address; |
1515 | }; | |
1516 | ||
6da0b565 | 1517 | struct module_sect_attrs { |
a58730c4 RR |
1518 | struct attribute_group grp; |
1519 | unsigned int nsections; | |
0f742266 | 1520 | struct module_sect_attr attrs[]; |
a58730c4 RR |
1521 | }; |
1522 | ||
11990a5b | 1523 | #define MODULE_SECT_READ_SIZE (3 /* "0x", "\n" */ + (BITS_PER_LONG / 4)) |
ed66f991 KC |
1524 | static ssize_t module_sect_read(struct file *file, struct kobject *kobj, |
1525 | struct bin_attribute *battr, | |
1526 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1527 | { |
1528 | struct module_sect_attr *sattr = | |
ed66f991 | 1529 | container_of(battr, struct module_sect_attr, battr); |
11990a5b KC |
1530 | char bounce[MODULE_SECT_READ_SIZE + 1]; |
1531 | size_t wrote; | |
ed66f991 KC |
1532 | |
1533 | if (pos != 0) | |
1534 | return -EINVAL; | |
1535 | ||
11990a5b KC |
1536 | /* |
1537 | * Since we're a binary read handler, we must account for the | |
1538 | * trailing NUL byte that sprintf will write: if "buf" is | |
1539 | * too small to hold the NUL, or the NUL is exactly the last | |
1540 | * byte, the read will look like it got truncated by one byte. | |
1541 | * Since there is no way to ask sprintf nicely to not write | |
1542 | * the NUL, we have to use a bounce buffer. | |
1543 | */ | |
1544 | wrote = scnprintf(bounce, sizeof(bounce), "0x%px\n", | |
1545 | kallsyms_show_value(file->f_cred) | |
1546 | ? (void *)sattr->address : NULL); | |
1547 | count = min(count, wrote); | |
1548 | memcpy(buf, bounce, count); | |
1549 | ||
1550 | return count; | |
1da177e4 LT |
1551 | } |
1552 | ||
04b1db9f IN |
1553 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1554 | { | |
a58730c4 | 1555 | unsigned int section; |
04b1db9f IN |
1556 | |
1557 | for (section = 0; section < sect_attrs->nsections; section++) | |
ed66f991 | 1558 | kfree(sect_attrs->attrs[section].battr.attr.name); |
04b1db9f IN |
1559 | kfree(sect_attrs); |
1560 | } | |
1561 | ||
8f6d0378 | 1562 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1563 | { |
1564 | unsigned int nloaded = 0, i, size[2]; | |
1565 | struct module_sect_attrs *sect_attrs; | |
1566 | struct module_sect_attr *sattr; | |
ed66f991 | 1567 | struct bin_attribute **gattr; |
22a8bdeb | 1568 | |
1da177e4 | 1569 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1570 | for (i = 0; i < info->hdr->e_shnum; i++) |
1571 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 | 1572 | nloaded++; |
8d1b73dd | 1573 | size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
ed66f991 KC |
1574 | sizeof(sect_attrs->grp.bin_attrs[0])); |
1575 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.bin_attrs[0]); | |
04b1db9f IN |
1576 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1577 | if (sect_attrs == NULL) | |
1da177e4 LT |
1578 | return; |
1579 | ||
1580 | /* Setup section attributes. */ | |
1581 | sect_attrs->grp.name = "sections"; | |
ed66f991 | 1582 | sect_attrs->grp.bin_attrs = (void *)sect_attrs + size[0]; |
1da177e4 | 1583 | |
04b1db9f | 1584 | sect_attrs->nsections = 0; |
1da177e4 | 1585 | sattr = §_attrs->attrs[0]; |
ed66f991 | 1586 | gattr = §_attrs->grp.bin_attrs[0]; |
8f6d0378 RR |
1587 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1588 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1589 | if (sect_empty(sec)) | |
35dead42 | 1590 | continue; |
ed66f991 | 1591 | sysfs_bin_attr_init(&sattr->battr); |
8f6d0378 | 1592 | sattr->address = sec->sh_addr; |
ed66f991 KC |
1593 | sattr->battr.attr.name = |
1594 | kstrdup(info->secstrings + sec->sh_name, GFP_KERNEL); | |
1595 | if (sattr->battr.attr.name == NULL) | |
04b1db9f IN |
1596 | goto out; |
1597 | sect_attrs->nsections++; | |
ed66f991 | 1598 | sattr->battr.read = module_sect_read; |
11990a5b | 1599 | sattr->battr.size = MODULE_SECT_READ_SIZE; |
ed66f991 KC |
1600 | sattr->battr.attr.mode = 0400; |
1601 | *(gattr++) = &(sattr++)->battr; | |
1da177e4 LT |
1602 | } |
1603 | *gattr = NULL; | |
1604 | ||
1605 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1606 | goto out; | |
1607 | ||
1608 | mod->sect_attrs = sect_attrs; | |
1609 | return; | |
1610 | out: | |
04b1db9f | 1611 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1612 | } |
1613 | ||
1614 | static void remove_sect_attrs(struct module *mod) | |
1615 | { | |
1616 | if (mod->sect_attrs) { | |
1617 | sysfs_remove_group(&mod->mkobj.kobj, | |
1618 | &mod->sect_attrs->grp); | |
1619 | /* We are positive that no one is using any sect attrs | |
1620 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1621 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1622 | mod->sect_attrs = NULL; |
1623 | } | |
1624 | } | |
1625 | ||
6d760133 RM |
1626 | /* |
1627 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1628 | */ | |
1629 | ||
1630 | struct module_notes_attrs { | |
1631 | struct kobject *dir; | |
1632 | unsigned int notes; | |
0f742266 | 1633 | struct bin_attribute attrs[]; |
6d760133 RM |
1634 | }; |
1635 | ||
2c3c8bea | 1636 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1637 | struct bin_attribute *bin_attr, |
1638 | char *buf, loff_t pos, size_t count) | |
1639 | { | |
1640 | /* | |
1641 | * The caller checked the pos and count against our size. | |
1642 | */ | |
1643 | memcpy(buf, bin_attr->private + pos, count); | |
1644 | return count; | |
1645 | } | |
1646 | ||
1647 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1648 | unsigned int i) | |
1649 | { | |
1650 | if (notes_attrs->dir) { | |
1651 | while (i-- > 0) | |
1652 | sysfs_remove_bin_file(notes_attrs->dir, | |
1653 | ¬es_attrs->attrs[i]); | |
e9432093 | 1654 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1655 | } |
1656 | kfree(notes_attrs); | |
1657 | } | |
1658 | ||
8f6d0378 | 1659 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1660 | { |
1661 | unsigned int notes, loaded, i; | |
1662 | struct module_notes_attrs *notes_attrs; | |
1663 | struct bin_attribute *nattr; | |
1664 | ||
ea6bff36 IM |
1665 | /* failed to create section attributes, so can't create notes */ |
1666 | if (!mod->sect_attrs) | |
1667 | return; | |
1668 | ||
6d760133 RM |
1669 | /* Count notes sections and allocate structures. */ |
1670 | notes = 0; | |
8f6d0378 RR |
1671 | for (i = 0; i < info->hdr->e_shnum; i++) |
1672 | if (!sect_empty(&info->sechdrs[i]) && | |
1673 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1674 | ++notes; |
1675 | ||
1676 | if (notes == 0) | |
1677 | return; | |
1678 | ||
acafe7e3 | 1679 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1680 | GFP_KERNEL); |
1681 | if (notes_attrs == NULL) | |
1682 | return; | |
1683 | ||
1684 | notes_attrs->notes = notes; | |
1685 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1686 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1687 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1688 | continue; |
8f6d0378 | 1689 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1690 | sysfs_bin_attr_init(nattr); |
ed66f991 | 1691 | nattr->attr.name = mod->sect_attrs->attrs[loaded].battr.attr.name; |
6d760133 | 1692 | nattr->attr.mode = S_IRUGO; |
8f6d0378 RR |
1693 | nattr->size = info->sechdrs[i].sh_size; |
1694 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1695 | nattr->read = module_notes_read; |
1696 | ++nattr; | |
1697 | } | |
1698 | ++loaded; | |
1699 | } | |
1700 | ||
4ff6abff | 1701 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1702 | if (!notes_attrs->dir) |
1703 | goto out; | |
1704 | ||
1705 | for (i = 0; i < notes; ++i) | |
1706 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1707 | ¬es_attrs->attrs[i])) | |
1708 | goto out; | |
1709 | ||
1710 | mod->notes_attrs = notes_attrs; | |
1711 | return; | |
1712 | ||
1713 | out: | |
1714 | free_notes_attrs(notes_attrs, i); | |
1715 | } | |
1716 | ||
1717 | static void remove_notes_attrs(struct module *mod) | |
1718 | { | |
1719 | if (mod->notes_attrs) | |
1720 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1721 | } | |
1722 | ||
1da177e4 | 1723 | #else |
04b1db9f | 1724 | |
8f6d0378 RR |
1725 | static inline void add_sect_attrs(struct module *mod, |
1726 | const struct load_info *info) | |
1da177e4 LT |
1727 | { |
1728 | } | |
1729 | ||
1730 | static inline void remove_sect_attrs(struct module *mod) | |
1731 | { | |
1732 | } | |
6d760133 | 1733 | |
8f6d0378 RR |
1734 | static inline void add_notes_attrs(struct module *mod, |
1735 | const struct load_info *info) | |
6d760133 RM |
1736 | { |
1737 | } | |
1738 | ||
1739 | static inline void remove_notes_attrs(struct module *mod) | |
1740 | { | |
1741 | } | |
8f6d0378 | 1742 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1743 | |
1ba5c08b | 1744 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1745 | { |
1746 | #ifdef CONFIG_MODULE_UNLOAD | |
1747 | struct module_use *use; | |
80a3d1bb | 1748 | |
75676500 | 1749 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1750 | list_for_each_entry(use, &mod->target_list, target_list) |
1751 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1752 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1753 | #endif |
1754 | } | |
1755 | ||
1ba5c08b | 1756 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1757 | { |
1ba5c08b | 1758 | int ret = 0; |
80a3d1bb RR |
1759 | #ifdef CONFIG_MODULE_UNLOAD |
1760 | struct module_use *use; | |
1761 | ||
75676500 | 1762 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1763 | list_for_each_entry(use, &mod->target_list, target_list) { |
1764 | ret = sysfs_create_link(use->target->holders_dir, | |
1765 | &mod->mkobj.kobj, mod->name); | |
1766 | if (ret) | |
1767 | break; | |
1768 | } | |
75676500 | 1769 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1770 | if (ret) |
1771 | del_usage_links(mod); | |
80a3d1bb | 1772 | #endif |
1ba5c08b | 1773 | return ret; |
80a3d1bb RR |
1774 | } |
1775 | ||
bc6f2a75 Y |
1776 | static void module_remove_modinfo_attrs(struct module *mod, int end); |
1777 | ||
6407ebb2 | 1778 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1779 | { |
1780 | struct module_attribute *attr; | |
03e88ae1 | 1781 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1782 | int error = 0; |
1783 | int i; | |
1784 | ||
03e88ae1 GKH |
1785 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1786 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1787 | GFP_KERNEL); | |
1788 | if (!mod->modinfo_attrs) | |
1789 | return -ENOMEM; | |
1790 | ||
1791 | temp_attr = mod->modinfo_attrs; | |
bc6f2a75 | 1792 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
c75b590d | 1793 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1794 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1795 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1796 | error = sysfs_create_file(&mod->mkobj.kobj, |
1797 | &temp_attr->attr); | |
bc6f2a75 Y |
1798 | if (error) |
1799 | goto error_out; | |
03e88ae1 GKH |
1800 | ++temp_attr; |
1801 | } | |
c988d2b2 | 1802 | } |
bc6f2a75 Y |
1803 | |
1804 | return 0; | |
1805 | ||
1806 | error_out: | |
1807 | if (i > 0) | |
1808 | module_remove_modinfo_attrs(mod, --i); | |
f6d061d6 Y |
1809 | else |
1810 | kfree(mod->modinfo_attrs); | |
c988d2b2 MD |
1811 | return error; |
1812 | } | |
1813 | ||
bc6f2a75 | 1814 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
c988d2b2 MD |
1815 | { |
1816 | struct module_attribute *attr; | |
1817 | int i; | |
1818 | ||
03e88ae1 | 1819 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
bc6f2a75 Y |
1820 | if (end >= 0 && i > end) |
1821 | break; | |
03e88ae1 GKH |
1822 | /* pick a field to test for end of list */ |
1823 | if (!attr->attr.name) | |
1824 | break; | |
6da0b565 | 1825 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1826 | if (attr->free) |
1827 | attr->free(mod); | |
c988d2b2 | 1828 | } |
03e88ae1 | 1829 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1830 | } |
1da177e4 | 1831 | |
942e4431 LZ |
1832 | static void mod_kobject_put(struct module *mod) |
1833 | { | |
1834 | DECLARE_COMPLETION_ONSTACK(c); | |
1835 | mod->mkobj.kobj_completion = &c; | |
1836 | kobject_put(&mod->mkobj.kobj); | |
1837 | wait_for_completion(&c); | |
1838 | } | |
1839 | ||
6407ebb2 | 1840 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1841 | { |
1842 | int err; | |
6494a93d | 1843 | struct kobject *kobj; |
1da177e4 | 1844 | |
823bccfc | 1845 | if (!module_sysfs_initialized) { |
bddb12b3 | 1846 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1847 | err = -EINVAL; |
1848 | goto out; | |
1849 | } | |
6494a93d GKH |
1850 | |
1851 | kobj = kset_find_obj(module_kset, mod->name); | |
1852 | if (kobj) { | |
bddb12b3 | 1853 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1854 | kobject_put(kobj); |
1855 | err = -EINVAL; | |
1856 | goto out; | |
1857 | } | |
1858 | ||
1da177e4 | 1859 | mod->mkobj.mod = mod; |
e17e0f51 | 1860 | |
ac3c8141 GKH |
1861 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1862 | mod->mkobj.kobj.kset = module_kset; | |
1863 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1864 | "%s", mod->name); | |
1865 | if (err) | |
942e4431 | 1866 | mod_kobject_put(mod); |
270a6c4c | 1867 | |
97c146ef | 1868 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1869 | out: |
1870 | return err; | |
1871 | } | |
1872 | ||
6407ebb2 | 1873 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1874 | const struct load_info *info, |
270a6c4c KS |
1875 | struct kernel_param *kparam, |
1876 | unsigned int num_params) | |
1877 | { | |
1878 | int err; | |
1879 | ||
80a3d1bb RR |
1880 | err = mod_sysfs_init(mod); |
1881 | if (err) | |
1882 | goto out; | |
1883 | ||
4ff6abff | 1884 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1885 | if (!mod->holders_dir) { |
1886 | err = -ENOMEM; | |
270a6c4c | 1887 | goto out_unreg; |
240936e1 | 1888 | } |
270a6c4c | 1889 | |
1da177e4 LT |
1890 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1891 | if (err) | |
270a6c4c | 1892 | goto out_unreg_holders; |
1da177e4 | 1893 | |
c988d2b2 MD |
1894 | err = module_add_modinfo_attrs(mod); |
1895 | if (err) | |
e17e0f51 | 1896 | goto out_unreg_param; |
c988d2b2 | 1897 | |
1ba5c08b CL |
1898 | err = add_usage_links(mod); |
1899 | if (err) | |
1900 | goto out_unreg_modinfo_attrs; | |
1901 | ||
8f6d0378 RR |
1902 | add_sect_attrs(mod, info); |
1903 | add_notes_attrs(mod, info); | |
80a3d1bb | 1904 | |
e17e0f51 | 1905 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1906 | return 0; |
1907 | ||
1ba5c08b | 1908 | out_unreg_modinfo_attrs: |
bc6f2a75 | 1909 | module_remove_modinfo_attrs(mod, -1); |
e17e0f51 KS |
1910 | out_unreg_param: |
1911 | module_param_sysfs_remove(mod); | |
270a6c4c | 1912 | out_unreg_holders: |
78a2d906 | 1913 | kobject_put(mod->holders_dir); |
270a6c4c | 1914 | out_unreg: |
942e4431 | 1915 | mod_kobject_put(mod); |
80a3d1bb | 1916 | out: |
1da177e4 LT |
1917 | return err; |
1918 | } | |
34e4e2fe DL |
1919 | |
1920 | static void mod_sysfs_fini(struct module *mod) | |
1921 | { | |
8f6d0378 RR |
1922 | remove_notes_attrs(mod); |
1923 | remove_sect_attrs(mod); | |
942e4431 | 1924 | mod_kobject_put(mod); |
34e4e2fe DL |
1925 | } |
1926 | ||
cf2fde7b RR |
1927 | static void init_param_lock(struct module *mod) |
1928 | { | |
1929 | mutex_init(&mod->param_lock); | |
1930 | } | |
8f6d0378 | 1931 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1932 | |
8f6d0378 RR |
1933 | static int mod_sysfs_setup(struct module *mod, |
1934 | const struct load_info *info, | |
6407ebb2 RR |
1935 | struct kernel_param *kparam, |
1936 | unsigned int num_params) | |
1937 | { | |
1938 | return 0; | |
1939 | } | |
1940 | ||
34e4e2fe DL |
1941 | static void mod_sysfs_fini(struct module *mod) |
1942 | { | |
1943 | } | |
1944 | ||
bc6f2a75 | 1945 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
36b0360d RR |
1946 | { |
1947 | } | |
1948 | ||
80a3d1bb RR |
1949 | static void del_usage_links(struct module *mod) |
1950 | { | |
1951 | } | |
1952 | ||
cf2fde7b RR |
1953 | static void init_param_lock(struct module *mod) |
1954 | { | |
1955 | } | |
34e4e2fe | 1956 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1957 | |
36b0360d | 1958 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1959 | { |
80a3d1bb | 1960 | del_usage_links(mod); |
bc6f2a75 | 1961 | module_remove_modinfo_attrs(mod, -1); |
1da177e4 | 1962 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1963 | kobject_put(mod->mkobj.drivers_dir); |
1964 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1965 | mod_sysfs_fini(mod); |
1da177e4 LT |
1966 | } |
1967 | ||
84e1c6bb MC |
1968 | /* |
1969 | * LKM RO/NX protection: protect module's text/ro-data | |
1970 | * from modification and any data from execution. | |
85c898db RR |
1971 | * |
1972 | * General layout of module is: | |
444d13ff JY |
1973 | * [text] [read-only-data] [ro-after-init] [writable data] |
1974 | * text_size -----^ ^ ^ ^ | |
1975 | * ro_size ------------------------| | | | |
1976 | * ro_after_init_size -----------------------------| | | |
1977 | * size -----------------------------------------------------------| | |
85c898db RR |
1978 | * |
1979 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1980 | */ |
db991af0 JY |
1981 | |
1982 | /* | |
1983 | * Since some arches are moving towards PAGE_KERNEL module allocations instead | |
1984 | * of PAGE_KERNEL_EXEC, keep frob_text() and module_enable_x() outside of the | |
1985 | * CONFIG_STRICT_MODULE_RWX block below because they are needed regardless of | |
1986 | * whether we are strict. | |
1987 | */ | |
1988 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX | |
85c898db RR |
1989 | static void frob_text(const struct module_layout *layout, |
1990 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1991 | { |
85c898db RR |
1992 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1993 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1994 | set_memory((unsigned long)layout->base, | |
1995 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1996 | } |
84e1c6bb | 1997 | |
db991af0 JY |
1998 | static void module_enable_x(const struct module *mod) |
1999 | { | |
2000 | frob_text(&mod->core_layout, set_memory_x); | |
2001 | frob_text(&mod->init_layout, set_memory_x); | |
2002 | } | |
2003 | #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
2004 | static void module_enable_x(const struct module *mod) { } | |
2005 | #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
2006 | ||
93651f80 | 2007 | #ifdef CONFIG_STRICT_MODULE_RWX |
85c898db RR |
2008 | static void frob_rodata(const struct module_layout *layout, |
2009 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 2010 | { |
85c898db RR |
2011 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
2012 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
2013 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
2014 | set_memory((unsigned long)layout->base + layout->text_size, | |
2015 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
2016 | } |
2017 | ||
444d13ff JY |
2018 | static void frob_ro_after_init(const struct module_layout *layout, |
2019 | int (*set_memory)(unsigned long start, int num_pages)) | |
2020 | { | |
2021 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
2022 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
2023 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
2024 | set_memory((unsigned long)layout->base + layout->ro_size, | |
2025 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
2026 | } | |
2027 | ||
85c898db RR |
2028 | static void frob_writable_data(const struct module_layout *layout, |
2029 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 2030 | { |
85c898db | 2031 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 2032 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 2033 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
2034 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
2035 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 2036 | } |
84e1c6bb | 2037 | |
e6eff437 | 2038 | static void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 2039 | { |
39290b38 AT |
2040 | if (!rodata_enabled) |
2041 | return; | |
2042 | ||
1a7b7d92 RE |
2043 | set_vm_flush_reset_perms(mod->core_layout.base); |
2044 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 2045 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 2046 | |
85c898db RR |
2047 | frob_rodata(&mod->core_layout, set_memory_ro); |
2048 | frob_text(&mod->init_layout, set_memory_ro); | |
2049 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
2050 | |
2051 | if (after_init) | |
2052 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
2053 | } |
2054 | ||
85c898db | 2055 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 2056 | { |
85c898db | 2057 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 2058 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
2059 | frob_writable_data(&mod->core_layout, set_memory_nx); |
2060 | frob_rodata(&mod->init_layout, set_memory_nx); | |
2061 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
2062 | } |
2063 | ||
5c3a7db0 PZ |
2064 | static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, |
2065 | char *secstrings, struct module *mod) | |
2066 | { | |
2067 | const unsigned long shf_wx = SHF_WRITE|SHF_EXECINSTR; | |
2068 | int i; | |
2069 | ||
2070 | for (i = 0; i < hdr->e_shnum; i++) { | |
2071 | if ((sechdrs[i].sh_flags & shf_wx) == shf_wx) | |
2072 | return -ENOEXEC; | |
2073 | } | |
2074 | ||
2075 | return 0; | |
2076 | } | |
2077 | ||
93651f80 | 2078 | #else /* !CONFIG_STRICT_MODULE_RWX */ |
85c898db | 2079 | static void module_enable_nx(const struct module *mod) { } |
e6eff437 | 2080 | static void module_enable_ro(const struct module *mod, bool after_init) {} |
5c3a7db0 PZ |
2081 | static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, |
2082 | char *secstrings, struct module *mod) | |
2eef1399 | 2083 | { |
5c3a7db0 | 2084 | return 0; |
2eef1399 | 2085 | } |
93651f80 | 2086 | #endif /* CONFIG_STRICT_MODULE_RWX */ |
84e1c6bb | 2087 | |
1ce15ef4 JY |
2088 | #ifdef CONFIG_LIVEPATCH |
2089 | /* | |
2090 | * Persist Elf information about a module. Copy the Elf header, | |
2091 | * section header table, section string table, and symtab section | |
2092 | * index from info to mod->klp_info. | |
2093 | */ | |
2094 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2095 | { | |
2096 | unsigned int size, symndx; | |
2097 | int ret; | |
2098 | ||
2099 | size = sizeof(*mod->klp_info); | |
2100 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2101 | if (mod->klp_info == NULL) | |
2102 | return -ENOMEM; | |
2103 | ||
2104 | /* Elf header */ | |
2105 | size = sizeof(mod->klp_info->hdr); | |
2106 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2107 | ||
2108 | /* Elf section header table */ | |
2109 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2110 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2111 | if (mod->klp_info->sechdrs == NULL) { |
2112 | ret = -ENOMEM; | |
2113 | goto free_info; | |
2114 | } | |
1ce15ef4 JY |
2115 | |
2116 | /* Elf section name string table */ | |
2117 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2118 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2119 | if (mod->klp_info->secstrings == NULL) { |
2120 | ret = -ENOMEM; | |
2121 | goto free_sechdrs; | |
2122 | } | |
1ce15ef4 JY |
2123 | |
2124 | /* Elf symbol section index */ | |
2125 | symndx = info->index.sym; | |
2126 | mod->klp_info->symndx = symndx; | |
2127 | ||
2128 | /* | |
2129 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2130 | * copy of the original symbol table. Adjust sh_addr to point | |
2131 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2132 | * init memory is freed at the end of do_init_module(). | |
2133 | */ | |
2134 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2135 | (unsigned long) mod->core_kallsyms.symtab; | |
2136 | ||
2137 | return 0; | |
2138 | ||
2139 | free_sechdrs: | |
2140 | kfree(mod->klp_info->sechdrs); | |
2141 | free_info: | |
2142 | kfree(mod->klp_info); | |
2143 | return ret; | |
2144 | } | |
2145 | ||
2146 | static void free_module_elf(struct module *mod) | |
2147 | { | |
2148 | kfree(mod->klp_info->sechdrs); | |
2149 | kfree(mod->klp_info->secstrings); | |
2150 | kfree(mod->klp_info); | |
2151 | } | |
2152 | #else /* !CONFIG_LIVEPATCH */ | |
2153 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2154 | { | |
2155 | return 0; | |
2156 | } | |
2157 | ||
2158 | static void free_module_elf(struct module *mod) | |
2159 | { | |
2160 | } | |
2161 | #endif /* CONFIG_LIVEPATCH */ | |
2162 | ||
be1f221c | 2163 | void __weak module_memfree(void *module_region) |
74e08fcf | 2164 | { |
1a7b7d92 RE |
2165 | /* |
2166 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2167 | * supported by vmalloc. | |
2168 | */ | |
2169 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2170 | vfree(module_region); |
2171 | } | |
2172 | ||
2173 | void __weak module_arch_cleanup(struct module *mod) | |
2174 | { | |
2175 | } | |
2176 | ||
d453cded RR |
2177 | void __weak module_arch_freeing_init(struct module *mod) |
2178 | { | |
2179 | } | |
2180 | ||
75676500 | 2181 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2182 | static void free_module(struct module *mod) |
2183 | { | |
7ead8b83 LZ |
2184 | trace_module_free(mod); |
2185 | ||
36b0360d | 2186 | mod_sysfs_teardown(mod); |
1da177e4 | 2187 | |
944a1fa0 RR |
2188 | /* We leave it in list to prevent duplicate loads, but make sure |
2189 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2190 | mutex_lock(&module_mutex); |
944a1fa0 | 2191 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2192 | mutex_unlock(&module_mutex); |
944a1fa0 | 2193 | |
b82bab4b JB |
2194 | /* Remove dynamic debug info */ |
2195 | ddebug_remove_module(mod->name); | |
2196 | ||
1da177e4 LT |
2197 | /* Arch-specific cleanup. */ |
2198 | module_arch_cleanup(mod); | |
2199 | ||
2200 | /* Module unload stuff */ | |
2201 | module_unload_free(mod); | |
2202 | ||
e180a6b7 RR |
2203 | /* Free any allocated parameters. */ |
2204 | destroy_params(mod->kp, mod->num_kp); | |
2205 | ||
1ce15ef4 JY |
2206 | if (is_livepatch_module(mod)) |
2207 | free_module_elf(mod); | |
2208 | ||
944a1fa0 RR |
2209 | /* Now we can delete it from the lists */ |
2210 | mutex_lock(&module_mutex); | |
461e34ae MH |
2211 | /* Unlink carefully: kallsyms could be walking list. */ |
2212 | list_del_rcu(&mod->list); | |
93c2e105 | 2213 | mod_tree_remove(mod); |
0286b5ea | 2214 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2215 | module_bug_cleanup(mod); |
0be964be | 2216 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2217 | synchronize_rcu(); |
944a1fa0 RR |
2218 | mutex_unlock(&module_mutex); |
2219 | ||
85c898db | 2220 | /* This may be empty, but that's OK */ |
d453cded | 2221 | module_arch_freeing_init(mod); |
7523e4dc | 2222 | module_memfree(mod->init_layout.base); |
1da177e4 | 2223 | kfree(mod->args); |
259354de | 2224 | percpu_modfree(mod); |
9f85a4bb | 2225 | |
35a9393c | 2226 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2227 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2228 | |
1da177e4 | 2229 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2230 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2231 | } |
2232 | ||
2233 | void *__symbol_get(const char *symbol) | |
2234 | { | |
2235 | struct module *owner; | |
414fd31b | 2236 | const struct kernel_symbol *sym; |
1da177e4 | 2237 | |
24da1cbf | 2238 | preempt_disable(); |
414fd31b TA |
2239 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2240 | if (sym && strong_try_module_get(owner)) | |
2241 | sym = NULL; | |
24da1cbf | 2242 | preempt_enable(); |
1da177e4 | 2243 | |
7290d580 | 2244 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2245 | } |
2246 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2247 | ||
eea8b54d AN |
2248 | /* |
2249 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2250 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2251 | * |
2252 | * You must hold the module_mutex. | |
eea8b54d | 2253 | */ |
2d25bc55 | 2254 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2255 | { |
b211104d | 2256 | unsigned int i; |
eea8b54d | 2257 | struct module *owner; |
b211104d RR |
2258 | const struct kernel_symbol *s; |
2259 | struct { | |
2260 | const struct kernel_symbol *sym; | |
2261 | unsigned int num; | |
2262 | } arr[] = { | |
2263 | { mod->syms, mod->num_syms }, | |
2264 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2265 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2266 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2267 | { mod->unused_syms, mod->num_unused_syms }, |
2268 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2269 | #endif |
b211104d | 2270 | }; |
eea8b54d | 2271 | |
b211104d RR |
2272 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2273 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 AB |
2274 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
2275 | true, false)) { | |
bddb12b3 | 2276 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2277 | " (owned by %s)\n", |
7290d580 AB |
2278 | mod->name, kernel_symbol_name(s), |
2279 | module_name(owner)); | |
b211104d RR |
2280 | return -ENOEXEC; |
2281 | } | |
eea8b54d | 2282 | } |
b211104d RR |
2283 | } |
2284 | return 0; | |
eea8b54d AN |
2285 | } |
2286 | ||
9a4b9708 | 2287 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2288 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2289 | { | |
2290 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2291 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2292 | unsigned long secbase; |
49668688 | 2293 | unsigned int i; |
1da177e4 | 2294 | int ret = 0; |
414fd31b | 2295 | const struct kernel_symbol *ksym; |
1da177e4 | 2296 | |
49668688 RR |
2297 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2298 | const char *name = info->strtab + sym[i].st_name; | |
2299 | ||
1da177e4 LT |
2300 | switch (sym[i].st_shndx) { |
2301 | case SHN_COMMON: | |
80375980 JM |
2302 | /* Ignore common symbols */ |
2303 | if (!strncmp(name, "__gnu_lto", 9)) | |
2304 | break; | |
2305 | ||
1da177e4 LT |
2306 | /* We compiled with -fno-common. These are not |
2307 | supposed to happen. */ | |
5e124169 | 2308 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2309 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2310 | mod->name); |
2311 | ret = -ENOEXEC; | |
2312 | break; | |
2313 | ||
2314 | case SHN_ABS: | |
2315 | /* Don't need to do anything */ | |
5e124169 | 2316 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2317 | (long)sym[i].st_value); |
2318 | break; | |
2319 | ||
1ce15ef4 JY |
2320 | case SHN_LIVEPATCH: |
2321 | /* Livepatch symbols are resolved by livepatch */ | |
2322 | break; | |
2323 | ||
1da177e4 | 2324 | case SHN_UNDEF: |
49668688 | 2325 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2326 | /* Ok if resolved. */ |
9bea7f23 | 2327 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2328 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2329 | break; |
414fd31b TA |
2330 | } |
2331 | ||
1da177e4 | 2332 | /* Ok if weak. */ |
9bea7f23 | 2333 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2334 | break; |
2335 | ||
9bea7f23 | 2336 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2337 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2338 | mod->name, name, ret); | |
1da177e4 LT |
2339 | break; |
2340 | ||
2341 | default: | |
2342 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2343 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2344 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2345 | else |
49668688 | 2346 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2347 | sym[i].st_value += secbase; |
2348 | break; | |
2349 | } | |
2350 | } | |
2351 | ||
2352 | return ret; | |
2353 | } | |
2354 | ||
49668688 | 2355 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2356 | { |
2357 | unsigned int i; | |
2358 | int err = 0; | |
2359 | ||
2360 | /* Now do relocations. */ | |
49668688 RR |
2361 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2362 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2363 | |
2364 | /* Not a valid relocation section? */ | |
49668688 | 2365 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2366 | continue; |
2367 | ||
2368 | /* Don't bother with non-allocated sections */ | |
49668688 | 2369 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2370 | continue; |
2371 | ||
1ce15ef4 | 2372 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) |
7c8e2bdd JP |
2373 | err = klp_apply_section_relocs(mod, info->sechdrs, |
2374 | info->secstrings, | |
2375 | info->strtab, | |
2376 | info->index.sym, i, | |
2377 | NULL); | |
2378 | else if (info->sechdrs[i].sh_type == SHT_REL) | |
49668688 RR |
2379 | err = apply_relocate(info->sechdrs, info->strtab, |
2380 | info->index.sym, i, mod); | |
2381 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2382 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2383 | info->index.sym, i, mod); | |
22e268eb RR |
2384 | if (err < 0) |
2385 | break; | |
2386 | } | |
2387 | return err; | |
2388 | } | |
2389 | ||
088af9a6 HD |
2390 | /* Additional bytes needed by arch in front of individual sections */ |
2391 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2392 | unsigned int section) | |
2393 | { | |
2394 | /* default implementation just returns zero */ | |
2395 | return 0; | |
2396 | } | |
2397 | ||
1da177e4 | 2398 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2399 | static long get_offset(struct module *mod, unsigned int *size, |
2400 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2401 | { |
2402 | long ret; | |
2403 | ||
088af9a6 | 2404 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2405 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2406 | *size = ret + sechdr->sh_size; | |
2407 | return ret; | |
2408 | } | |
2409 | ||
2410 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2411 | might -- code, read-only data, read-write data, small data. Tally | |
2412 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2413 | belongs in init. */ | |
49668688 | 2414 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2415 | { |
2416 | static unsigned long const masks[][2] = { | |
2417 | /* NOTE: all executable code must be the first section | |
2418 | * in this array; otherwise modify the text_size | |
2419 | * finder in the two loops below */ | |
2420 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2421 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2422 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2423 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2424 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2425 | }; | |
2426 | unsigned int m, i; | |
2427 | ||
49668688 RR |
2428 | for (i = 0; i < info->hdr->e_shnum; i++) |
2429 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2430 | |
5e124169 | 2431 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2432 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2433 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2434 | Elf_Shdr *s = &info->sechdrs[i]; | |
2435 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2436 | |
2437 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2438 | || (s->sh_flags & masks[m][1]) | |
2439 | || s->sh_entsize != ~0UL | |
23189766 | 2440 | || module_init_section(sname)) |
1da177e4 | 2441 | continue; |
7523e4dc | 2442 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2443 | pr_debug("\t%s\n", sname); |
1da177e4 | 2444 | } |
84e1c6bb MC |
2445 | switch (m) { |
2446 | case 0: /* executable */ | |
7523e4dc RR |
2447 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2448 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2449 | break; |
2450 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2451 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2452 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2453 | break; |
444d13ff JY |
2454 | case 2: /* RO after init */ |
2455 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2456 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2457 | break; | |
2458 | case 4: /* whole core */ | |
7523e4dc | 2459 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2460 | break; |
2461 | } | |
1da177e4 LT |
2462 | } |
2463 | ||
5e124169 | 2464 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2465 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2466 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2467 | Elf_Shdr *s = &info->sechdrs[i]; | |
2468 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2469 | |
2470 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2471 | || (s->sh_flags & masks[m][1]) | |
2472 | || s->sh_entsize != ~0UL | |
23189766 | 2473 | || !module_init_section(sname)) |
1da177e4 | 2474 | continue; |
7523e4dc | 2475 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2476 | | INIT_OFFSET_MASK); |
5e124169 | 2477 | pr_debug("\t%s\n", sname); |
1da177e4 | 2478 | } |
84e1c6bb MC |
2479 | switch (m) { |
2480 | case 0: /* executable */ | |
7523e4dc RR |
2481 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2482 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2483 | break; |
2484 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2485 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2486 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2487 | break; |
444d13ff JY |
2488 | case 2: |
2489 | /* | |
2490 | * RO after init doesn't apply to init_layout (only | |
2491 | * core_layout), so it just takes the value of ro_size. | |
2492 | */ | |
2493 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2494 | break; | |
2495 | case 4: /* whole init */ | |
7523e4dc | 2496 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2497 | break; |
2498 | } | |
1da177e4 LT |
2499 | } |
2500 | } | |
2501 | ||
1da177e4 LT |
2502 | static void set_license(struct module *mod, const char *license) |
2503 | { | |
2504 | if (!license) | |
2505 | license = "unspecified"; | |
2506 | ||
fa3ba2e8 | 2507 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2508 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2509 | pr_warn("%s: module license '%s' taints kernel.\n", |
2510 | mod->name, license); | |
373d4d09 RR |
2511 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2512 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2513 | } |
2514 | } | |
2515 | ||
2516 | /* Parse tag=value strings from .modinfo section */ | |
2517 | static char *next_string(char *string, unsigned long *secsize) | |
2518 | { | |
2519 | /* Skip non-zero chars */ | |
2520 | while (string[0]) { | |
2521 | string++; | |
2522 | if ((*secsize)-- <= 1) | |
2523 | return NULL; | |
2524 | } | |
2525 | ||
2526 | /* Skip any zero padding. */ | |
2527 | while (!string[0]) { | |
2528 | string++; | |
2529 | if ((*secsize)-- <= 1) | |
2530 | return NULL; | |
2531 | } | |
2532 | return string; | |
2533 | } | |
2534 | ||
c5e4a062 MM |
2535 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
2536 | char *prev) | |
1da177e4 LT |
2537 | { |
2538 | char *p; | |
2539 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2540 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2541 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2542 | |
5fdc7db6 JY |
2543 | /* |
2544 | * get_modinfo() calls made before rewrite_section_headers() | |
2545 | * must use sh_offset, as sh_addr isn't set! | |
2546 | */ | |
c5e4a062 MM |
2547 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
2548 | ||
2549 | if (prev) { | |
2550 | size -= prev - modinfo; | |
2551 | modinfo = next_string(prev, &size); | |
2552 | } | |
2553 | ||
2554 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2555 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2556 | return p + taglen + 1; | |
2557 | } | |
2558 | return NULL; | |
2559 | } | |
2560 | ||
c5e4a062 MM |
2561 | static char *get_modinfo(const struct load_info *info, const char *tag) |
2562 | { | |
2563 | return get_next_modinfo(info, tag, NULL); | |
2564 | } | |
2565 | ||
49668688 | 2566 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2567 | { |
2568 | struct module_attribute *attr; | |
2569 | int i; | |
2570 | ||
2571 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2572 | if (attr->setup) | |
49668688 | 2573 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2574 | } |
2575 | } | |
c988d2b2 | 2576 | |
a263f776 RR |
2577 | static void free_modinfo(struct module *mod) |
2578 | { | |
2579 | struct module_attribute *attr; | |
2580 | int i; | |
2581 | ||
2582 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2583 | if (attr->free) | |
2584 | attr->free(mod); | |
2585 | } | |
2586 | } | |
2587 | ||
1da177e4 | 2588 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2589 | |
2d25bc55 JY |
2590 | /* Lookup exported symbol in given range of kernel_symbols */ |
2591 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2592 | const struct kernel_symbol *start, | |
2593 | const struct kernel_symbol *stop) | |
15bba37d | 2594 | { |
9d63487f AIB |
2595 | return bsearch(name, start, stop - start, |
2596 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2597 | } |
2598 | ||
ca4787b7 TA |
2599 | static int is_exported(const char *name, unsigned long value, |
2600 | const struct module *mod) | |
1da177e4 | 2601 | { |
ca4787b7 TA |
2602 | const struct kernel_symbol *ks; |
2603 | if (!mod) | |
2d25bc55 | 2604 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2605 | else |
2d25bc55 JY |
2606 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2607 | ||
7290d580 | 2608 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2609 | } |
2610 | ||
2611 | /* As per nm */ | |
eded41c1 | 2612 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2613 | { |
eded41c1 RR |
2614 | const Elf_Shdr *sechdrs = info->sechdrs; |
2615 | ||
1da177e4 LT |
2616 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2617 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2618 | return 'v'; | |
2619 | else | |
2620 | return 'w'; | |
2621 | } | |
2622 | if (sym->st_shndx == SHN_UNDEF) | |
2623 | return 'U'; | |
e0224418 | 2624 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2625 | return 'a'; |
2626 | if (sym->st_shndx >= SHN_LORESERVE) | |
2627 | return '?'; | |
2628 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2629 | return 't'; | |
2630 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2631 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2632 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2633 | return 'r'; | |
2634 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2635 | return 'g'; | |
2636 | else | |
2637 | return 'd'; | |
2638 | } | |
2639 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2640 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2641 | return 's'; | |
2642 | else | |
2643 | return 'b'; | |
2644 | } | |
eded41c1 RR |
2645 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2646 | ".debug")) { | |
1da177e4 | 2647 | return 'n'; |
eded41c1 | 2648 | } |
1da177e4 LT |
2649 | return '?'; |
2650 | } | |
2651 | ||
4a496226 | 2652 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2653 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2654 | { |
2655 | const Elf_Shdr *sec; | |
2656 | ||
2657 | if (src->st_shndx == SHN_UNDEF | |
2658 | || src->st_shndx >= shnum | |
2659 | || !src->st_name) | |
2660 | return false; | |
2661 | ||
e0224418 MB |
2662 | #ifdef CONFIG_KALLSYMS_ALL |
2663 | if (src->st_shndx == pcpundx) | |
2664 | return true; | |
2665 | #endif | |
2666 | ||
4a496226 JB |
2667 | sec = sechdrs + src->st_shndx; |
2668 | if (!(sec->sh_flags & SHF_ALLOC) | |
2669 | #ifndef CONFIG_KALLSYMS_ALL | |
2670 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2671 | #endif | |
2672 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2673 | return false; | |
2674 | ||
2675 | return true; | |
2676 | } | |
2677 | ||
48fd1188 KC |
2678 | /* |
2679 | * We only allocate and copy the strings needed by the parts of symtab | |
2680 | * we keep. This is simple, but has the effect of making multiple | |
2681 | * copies of duplicates. We could be more sophisticated, see | |
2682 | * linux-kernel thread starting with | |
2683 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2684 | */ | |
49668688 | 2685 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2686 | { |
49668688 RR |
2687 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2688 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2689 | const Elf_Sym *src; |
54523ec7 | 2690 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2691 | |
2692 | /* Put symbol section at end of init part of module. */ | |
2693 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2694 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2695 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2696 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2697 | |
49668688 | 2698 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2699 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2700 | |
48fd1188 | 2701 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2702 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2703 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2704 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2705 | info->index.pcpu)) { | |
59ef28b1 | 2706 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2707 | ndst++; |
554bdfe5 | 2708 | } |
59ef28b1 | 2709 | } |
4a496226 JB |
2710 | |
2711 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2712 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2713 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2714 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2715 | info->core_typeoffs = mod->core_layout.size; |
2716 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2717 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2718 | |
554bdfe5 JB |
2719 | /* Put string table section at end of init part of module. */ |
2720 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2721 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2722 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2723 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2724 | |
2725 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2726 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2727 | __alignof__(struct mod_kallsyms)); | |
2728 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2729 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2730 | info->init_typeoffs = mod->init_layout.size; |
2731 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2732 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2733 | } |
2734 | ||
8244062e RR |
2735 | /* |
2736 | * We use the full symtab and strtab which layout_symtab arranged to | |
2737 | * be appended to the init section. Later we switch to the cut-down | |
2738 | * core-only ones. | |
2739 | */ | |
811d66a0 | 2740 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2741 | { |
4a496226 JB |
2742 | unsigned int i, ndst; |
2743 | const Elf_Sym *src; | |
2744 | Elf_Sym *dst; | |
554bdfe5 | 2745 | char *s; |
eded41c1 | 2746 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2747 | |
8244062e RR |
2748 | /* Set up to point into init section. */ |
2749 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2750 | ||
2751 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2752 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2753 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2754 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2755 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2756 | |
1c7651f4 EL |
2757 | /* |
2758 | * Now populate the cut down core kallsyms for after init | |
2759 | * and set types up while we still have access to sections. | |
2760 | */ | |
8244062e RR |
2761 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2762 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2763 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2764 | src = mod->kallsyms->symtab; |
2765 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2766 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2767 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2768 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2769 | info->index.pcpu)) { | |
1c7651f4 EL |
2770 | mod->core_kallsyms.typetab[ndst] = |
2771 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2772 | dst[ndst] = src[i]; |
8244062e RR |
2773 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2774 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2775 | KSYM_NAME_LEN) + 1; |
2776 | } | |
4a496226 | 2777 | } |
8244062e | 2778 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2779 | } |
2780 | #else | |
49668688 | 2781 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2782 | { |
2783 | } | |
3ae91c21 | 2784 | |
abbce906 | 2785 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2786 | { |
2787 | } | |
2788 | #endif /* CONFIG_KALLSYMS */ | |
2789 | ||
52796312 | 2790 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2791 | { |
811d66a0 RR |
2792 | if (!debug) |
2793 | return; | |
513770f5 | 2794 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2795 | } |
346e15be | 2796 | |
52796312 | 2797 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2798 | { |
2799 | if (debug) | |
52796312 | 2800 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2801 | } |
2802 | ||
74e08fcf JB |
2803 | void * __weak module_alloc(unsigned long size) |
2804 | { | |
7a0e27b2 CH |
2805 | return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, |
2806 | GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, | |
a3a66c38 | 2807 | NUMA_NO_NODE, __builtin_return_address(0)); |
74e08fcf JB |
2808 | } |
2809 | ||
23189766 VW |
2810 | bool __weak module_init_section(const char *name) |
2811 | { | |
2812 | return strstarts(name, ".init"); | |
2813 | } | |
2814 | ||
38b37d63 MS |
2815 | bool __weak module_exit_section(const char *name) |
2816 | { | |
2817 | return strstarts(name, ".exit"); | |
2818 | } | |
2819 | ||
4f2294b6 | 2820 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2821 | static void kmemleak_load_module(const struct module *mod, |
2822 | const struct load_info *info) | |
4f2294b6 CM |
2823 | { |
2824 | unsigned int i; | |
2825 | ||
2826 | /* only scan the sections containing data */ | |
c017b4be | 2827 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2828 | |
49668688 | 2829 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2830 | /* Scan all writable sections that's not executable */ |
2831 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2832 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2833 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2834 | continue; |
2835 | ||
49668688 RR |
2836 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2837 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2838 | } |
2839 | } | |
2840 | #else | |
49668688 RR |
2841 | static inline void kmemleak_load_module(const struct module *mod, |
2842 | const struct load_info *info) | |
4f2294b6 CM |
2843 | { |
2844 | } | |
2845 | #endif | |
2846 | ||
106a4ee2 | 2847 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2848 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 | 2849 | { |
49fcf732 | 2850 | int err = -ENODATA; |
34e1169d | 2851 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
49fcf732 | 2852 | const char *reason; |
34e1169d | 2853 | const void *mod = info->hdr; |
caabe240 | 2854 | |
bca014ca BH |
2855 | /* |
2856 | * Require flags == 0, as a module with version information | |
2857 | * removed is no longer the module that was signed | |
2858 | */ | |
2859 | if (flags == 0 && | |
2860 | info->len > markerlen && | |
34e1169d | 2861 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2862 | /* We truncate the module to discard the signature */ |
34e1169d | 2863 | info->len -= markerlen; |
f314dfea | 2864 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2865 | } |
2866 | ||
49fcf732 DH |
2867 | switch (err) { |
2868 | case 0: | |
106a4ee2 RR |
2869 | info->sig_ok = true; |
2870 | return 0; | |
106a4ee2 | 2871 | |
49fcf732 DH |
2872 | /* We don't permit modules to be loaded into trusted kernels |
2873 | * without a valid signature on them, but if we're not | |
2874 | * enforcing, certain errors are non-fatal. | |
2875 | */ | |
2876 | case -ENODATA: | |
2877 | reason = "Loading of unsigned module"; | |
2878 | goto decide; | |
2879 | case -ENOPKG: | |
2880 | reason = "Loading of module with unsupported crypto"; | |
2881 | goto decide; | |
2882 | case -ENOKEY: | |
2883 | reason = "Loading of module with unavailable key"; | |
2884 | decide: | |
2885 | if (is_module_sig_enforced()) { | |
e9f35f63 | 2886 | pr_notice("%s: %s is rejected\n", info->name, reason); |
49fcf732 DH |
2887 | return -EKEYREJECTED; |
2888 | } | |
106a4ee2 | 2889 | |
49fcf732 DH |
2890 | return security_locked_down(LOCKDOWN_MODULE_SIGNATURE); |
2891 | ||
2892 | /* All other errors are fatal, including nomem, unparseable | |
2893 | * signatures and signature check failures - even if signatures | |
2894 | * aren't required. | |
2895 | */ | |
2896 | default: | |
2897 | return err; | |
2898 | } | |
106a4ee2 RR |
2899 | } |
2900 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2901 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2902 | { |
2903 | return 0; | |
2904 | } | |
2905 | #endif /* !CONFIG_MODULE_SIG */ | |
2906 | ||
34e1169d KC |
2907 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2908 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2909 | { |
34e1169d KC |
2910 | if (info->len < sizeof(*(info->hdr))) |
2911 | return -ENOEXEC; | |
2912 | ||
2913 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2914 | || info->hdr->e_type != ET_REL | |
2915 | || !elf_check_arch(info->hdr) | |
2916 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2917 | return -ENOEXEC; | |
2918 | ||
2919 | if (info->hdr->e_shoff >= info->len | |
2920 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2921 | info->len - info->hdr->e_shoff)) | |
2922 | return -ENOEXEC; | |
40dd2560 | 2923 | |
34e1169d KC |
2924 | return 0; |
2925 | } | |
2926 | ||
3afe9f84 LT |
2927 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2928 | ||
2929 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2930 | { | |
2931 | do { | |
2932 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2933 | ||
2934 | if (copy_from_user(dst, usrc, n) != 0) | |
2935 | return -EFAULT; | |
2936 | cond_resched(); | |
2937 | dst += n; | |
2938 | usrc += n; | |
2939 | len -= n; | |
2940 | } while (len); | |
2941 | return 0; | |
2942 | } | |
2943 | ||
1ce15ef4 | 2944 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2945 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2946 | { |
2992ef29 JP |
2947 | if (get_modinfo(info, "livepatch")) { |
2948 | mod->klp = true; | |
2949 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2950 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2951 | mod->name); | |
2992ef29 | 2952 | } |
1ce15ef4 JY |
2953 | |
2954 | return 0; | |
2955 | } | |
2956 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2957 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2958 | { |
2959 | if (get_modinfo(info, "livepatch")) { | |
2960 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2961 | mod->name); | |
2962 | return -ENOEXEC; | |
2963 | } | |
2964 | ||
2965 | return 0; | |
2966 | } | |
2967 | #endif /* CONFIG_LIVEPATCH */ | |
2968 | ||
caf7501a AK |
2969 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2970 | { | |
2971 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2972 | return; | |
2973 | ||
2974 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2975 | mod->name); | |
2976 | } | |
2977 | ||
34e1169d KC |
2978 | /* Sets info->hdr and info->len. */ |
2979 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2980 | struct load_info *info) | |
40dd2560 RR |
2981 | { |
2982 | int err; | |
40dd2560 | 2983 | |
34e1169d KC |
2984 | info->len = len; |
2985 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2986 | return -ENOEXEC; |
2987 | ||
c77b8cdf | 2988 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2989 | if (err) |
2990 | return err; | |
2991 | ||
40dd2560 | 2992 | /* Suck in entire file: we'll want most of it. */ |
88dca4ca | 2993 | info->hdr = __vmalloc(info->len, GFP_KERNEL | __GFP_NOWARN); |
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"); | |
708e0ada | 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) { |
708e0ada 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", |
708e0ada | 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 | ||
66e9b071 TG |
3196 | mod->noinstr_text_start = section_objs(info, ".noinstr.text", 1, |
3197 | &mod->noinstr_text_size); | |
3198 | ||
f91a13bb | 3199 | #ifdef CONFIG_TRACEPOINTS |
65498646 MD |
3200 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3201 | sizeof(*mod->tracepoints_ptrs), | |
3202 | &mod->num_tracepoints); | |
f91a13bb | 3203 | #endif |
fe15b50c PM |
3204 | #ifdef CONFIG_TREE_SRCU |
3205 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
3206 | sizeof(*mod->srcu_struct_ptrs), | |
3207 | &mod->num_srcu_structs); | |
3208 | #endif | |
a38d1107 MM |
3209 | #ifdef CONFIG_BPF_EVENTS |
3210 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3211 | sizeof(*mod->bpf_raw_events), | |
3212 | &mod->num_bpf_raw_events); | |
3213 | #endif | |
e9666d10 | 3214 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3215 | mod->jump_entries = section_objs(info, "__jump_table", |
3216 | sizeof(*mod->jump_entries), | |
3217 | &mod->num_jump_entries); | |
3218 | #endif | |
f91a13bb | 3219 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3220 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3221 | sizeof(*mod->trace_events), |
3222 | &mod->num_trace_events); | |
99be647c JL |
3223 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3224 | sizeof(*mod->trace_evals), | |
3225 | &mod->num_trace_evals); | |
f91a13bb | 3226 | #endif |
13b9b6e7 SR |
3227 | #ifdef CONFIG_TRACING |
3228 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3229 | sizeof(*mod->trace_bprintk_fmt_start), | |
3230 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3231 | #endif |
f91a13bb LT |
3232 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3233 | /* sechdrs[0].sh_size is always zero */ | |
a1326b17 | 3234 | mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION, |
f91a13bb LT |
3235 | sizeof(*mod->ftrace_callsites), |
3236 | &mod->num_ftrace_callsites); | |
3237 | #endif | |
540adea3 MH |
3238 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3239 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3240 | sizeof(*mod->ei_funcs), | |
3241 | &mod->num_ei_funcs); | |
1e6769b0 MH |
3242 | #endif |
3243 | #ifdef CONFIG_KPROBES | |
3244 | mod->kprobes_text_start = section_objs(info, ".kprobes.text", 1, | |
3245 | &mod->kprobes_text_size); | |
16db6264 MH |
3246 | mod->kprobe_blacklist = section_objs(info, "_kprobe_blacklist", |
3247 | sizeof(unsigned long), | |
3248 | &mod->num_kprobe_blacklist); | |
92ace999 | 3249 | #endif |
811d66a0 RR |
3250 | mod->extable = section_objs(info, "__ex_table", |
3251 | sizeof(*mod->extable), &mod->num_exentries); | |
3252 | ||
49668688 | 3253 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3254 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 | 3255 | |
e5ebffe1 | 3256 | info->debug = section_objs(info, "__dyndbg", |
811d66a0 | 3257 | sizeof(*info->debug), &info->num_debug); |
eb3057df FH |
3258 | |
3259 | return 0; | |
f91a13bb LT |
3260 | } |
3261 | ||
49668688 | 3262 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3263 | { |
3264 | int i; | |
3265 | void *ptr; | |
3266 | ||
3267 | /* Do the allocs. */ | |
7523e4dc | 3268 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3269 | /* |
3270 | * The pointer to this block is stored in the module structure | |
3271 | * which is inside the block. Just mark it as not being a | |
3272 | * leak. | |
3273 | */ | |
3274 | kmemleak_not_leak(ptr); | |
3275 | if (!ptr) | |
d913188c | 3276 | return -ENOMEM; |
65b8a9b4 | 3277 | |
7523e4dc RR |
3278 | memset(ptr, 0, mod->core_layout.size); |
3279 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3280 | |
7523e4dc RR |
3281 | if (mod->init_layout.size) { |
3282 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3283 | /* |
3284 | * The pointer to this block is stored in the module structure | |
3285 | * which is inside the block. This block doesn't need to be | |
3286 | * scanned as it contains data and code that will be freed | |
3287 | * after the module is initialized. | |
3288 | */ | |
3289 | kmemleak_ignore(ptr); | |
3290 | if (!ptr) { | |
7523e4dc | 3291 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3292 | return -ENOMEM; |
3293 | } | |
7523e4dc RR |
3294 | memset(ptr, 0, mod->init_layout.size); |
3295 | mod->init_layout.base = ptr; | |
82fab442 | 3296 | } else |
7523e4dc | 3297 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3298 | |
3299 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3300 | pr_debug("final section addresses:\n"); |
49668688 | 3301 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3302 | void *dest; |
49668688 | 3303 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3304 | |
49668688 | 3305 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3306 | continue; |
3307 | ||
49668688 | 3308 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3309 | dest = mod->init_layout.base |
49668688 | 3310 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3311 | else |
7523e4dc | 3312 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3313 | |
49668688 RR |
3314 | if (shdr->sh_type != SHT_NOBITS) |
3315 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3316 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3317 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3318 | pr_debug("\t0x%lx %s\n", |
3319 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3320 | } |
d913188c RR |
3321 | |
3322 | return 0; | |
65b8a9b4 LT |
3323 | } |
3324 | ||
49668688 | 3325 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3326 | { |
3205c36c LP |
3327 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3328 | ||
22e268eb RR |
3329 | /* |
3330 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3331 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3332 | * using GPL-only symbols it needs. | |
3333 | */ | |
3334 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3335 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3336 | |
3337 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3338 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3339 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3340 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3341 | |
c99af375 MG |
3342 | /* lve claims to be GPL but upstream won't provide source */ |
3343 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3344 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3345 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3346 | |
3205c36c LP |
3347 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3348 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3349 | ||
22e268eb RR |
3350 | #ifdef CONFIG_MODVERSIONS |
3351 | if ((mod->num_syms && !mod->crcs) | |
3352 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3353 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3354 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3355 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3356 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3357 | #endif | |
3358 | ) { | |
3359 | return try_to_force_load(mod, | |
3360 | "no versions for exported symbols"); | |
3361 | } | |
3362 | #endif | |
3363 | return 0; | |
3364 | } | |
3365 | ||
3366 | static void flush_module_icache(const struct module *mod) | |
3367 | { | |
22e268eb RR |
3368 | /* |
3369 | * Flush the instruction cache, since we've played with text. | |
3370 | * Do it before processing of module parameters, so the module | |
3371 | * can provide parameter accessor functions of its own. | |
3372 | */ | |
7523e4dc RR |
3373 | if (mod->init_layout.base) |
3374 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3375 | (unsigned long)mod->init_layout.base | |
3376 | + mod->init_layout.size); | |
3377 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3378 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3379 | } |
3380 | ||
74e08fcf JB |
3381 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3382 | Elf_Shdr *sechdrs, | |
3383 | char *secstrings, | |
3384 | struct module *mod) | |
3385 | { | |
3386 | return 0; | |
3387 | } | |
3388 | ||
be7de5f9 PB |
3389 | /* module_blacklist is a comma-separated list of module names */ |
3390 | static char *module_blacklist; | |
96b5b194 | 3391 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3392 | { |
3393 | const char *p; | |
3394 | size_t len; | |
3395 | ||
3396 | if (!module_blacklist) | |
3397 | return false; | |
3398 | ||
3399 | for (p = module_blacklist; *p; p += len) { | |
3400 | len = strcspn(p, ","); | |
3401 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3402 | return true; | |
3403 | if (p[len] == ',') | |
3404 | len++; | |
3405 | } | |
3406 | return false; | |
3407 | } | |
3408 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3409 | ||
2f3238ae | 3410 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3411 | { |
1da177e4 | 3412 | struct module *mod; |
444d13ff | 3413 | unsigned int ndx; |
d913188c | 3414 | int err; |
3ae91c21 | 3415 | |
81a0abd9 | 3416 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3417 | if (err) |
3418 | return ERR_PTR(err); | |
1da177e4 | 3419 | |
1da177e4 | 3420 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3421 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3422 | info->secstrings, info->mod); |
1da177e4 | 3423 | if (err < 0) |
8d8022e8 | 3424 | return ERR_PTR(err); |
1da177e4 | 3425 | |
5c3a7db0 PZ |
3426 | err = module_enforce_rwx_sections(info->hdr, info->sechdrs, |
3427 | info->secstrings, info->mod); | |
3428 | if (err < 0) | |
3429 | return ERR_PTR(err); | |
3430 | ||
8d8022e8 RR |
3431 | /* We will do a special allocation for per-cpu sections later. */ |
3432 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3433 | |
444d13ff JY |
3434 | /* |
3435 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3436 | * layout_sections() can put it in the right place. | |
3437 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3438 | */ | |
3439 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3440 | if (ndx) |
3441 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3442 | /* | |
3443 | * Mark the __jump_table section as ro_after_init as well: these data | |
3444 | * structures are never modified, with the exception of entries that | |
3445 | * refer to code in the __init section, which are annotated as such | |
3446 | * at module load time. | |
3447 | */ | |
3448 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3449 | if (ndx) |
3450 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3451 | ||
1da177e4 LT |
3452 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3453 | this is done generically; there doesn't appear to be any | |
3454 | special cases for the architectures. */ | |
81a0abd9 JY |
3455 | layout_sections(info->mod, info); |
3456 | layout_symtab(info->mod, info); | |
1da177e4 | 3457 | |
65b8a9b4 | 3458 | /* Allocate and move to the final place */ |
81a0abd9 | 3459 | err = move_module(info->mod, info); |
d913188c | 3460 | if (err) |
8d8022e8 | 3461 | return ERR_PTR(err); |
d913188c RR |
3462 | |
3463 | /* Module has been copied to its final place now: return it. */ | |
3464 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3465 | kmemleak_load_module(mod, info); |
d913188c | 3466 | return mod; |
d913188c RR |
3467 | } |
3468 | ||
3469 | /* mod is no longer valid after this! */ | |
3470 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3471 | { | |
d913188c | 3472 | percpu_modfree(mod); |
d453cded | 3473 | module_arch_freeing_init(mod); |
7523e4dc RR |
3474 | module_memfree(mod->init_layout.base); |
3475 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3476 | } |
3477 | ||
74e08fcf JB |
3478 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3479 | const Elf_Shdr *sechdrs, | |
3480 | struct module *me) | |
3481 | { | |
3482 | return 0; | |
3483 | } | |
3484 | ||
811d66a0 RR |
3485 | static int post_relocation(struct module *mod, const struct load_info *info) |
3486 | { | |
51f3d0f4 | 3487 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3488 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3489 | ||
3490 | /* Copy relocated percpu area over. */ | |
3491 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3492 | info->sechdrs[info->index.pcpu].sh_size); | |
3493 | ||
51f3d0f4 | 3494 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3495 | add_kallsyms(mod, info); |
3496 | ||
3497 | /* Arch-specific module finalizing. */ | |
3498 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3499 | } | |
3500 | ||
9bb9c3be RR |
3501 | /* Is this module of this name done loading? No locks held. */ |
3502 | static bool finished_loading(const char *name) | |
3503 | { | |
3504 | struct module *mod; | |
3505 | bool ret; | |
3506 | ||
9cc019b8 PZ |
3507 | /* |
3508 | * The module_mutex should not be a heavily contended lock; | |
3509 | * if we get the occasional sleep here, we'll go an extra iteration | |
3510 | * in the wait_event_interruptible(), which is harmless. | |
3511 | */ | |
3512 | sched_annotate_sleep(); | |
9bb9c3be | 3513 | mutex_lock(&module_mutex); |
4f6de4d5 | 3514 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 3515 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
3516 | mutex_unlock(&module_mutex); |
3517 | ||
3518 | return ret; | |
3519 | } | |
3520 | ||
34e1169d KC |
3521 | /* Call module constructors. */ |
3522 | static void do_mod_ctors(struct module *mod) | |
3523 | { | |
3524 | #ifdef CONFIG_CONSTRUCTORS | |
3525 | unsigned long i; | |
3526 | ||
3527 | for (i = 0; i < mod->num_ctors; i++) | |
3528 | mod->ctors[i](); | |
3529 | #endif | |
3530 | } | |
3531 | ||
c7496379 RR |
3532 | /* For freeing module_init on success, in case kallsyms traversing */ |
3533 | struct mod_initfree { | |
1a7b7d92 | 3534 | struct llist_node node; |
c7496379 RR |
3535 | void *module_init; |
3536 | }; | |
3537 | ||
1a7b7d92 | 3538 | static void do_free_init(struct work_struct *w) |
c7496379 | 3539 | { |
1a7b7d92 RE |
3540 | struct llist_node *pos, *n, *list; |
3541 | struct mod_initfree *initfree; | |
3542 | ||
3543 | list = llist_del_all(&init_free_list); | |
3544 | ||
3545 | synchronize_rcu(); | |
3546 | ||
3547 | llist_for_each_safe(pos, n, list) { | |
3548 | initfree = container_of(pos, struct mod_initfree, node); | |
3549 | module_memfree(initfree->module_init); | |
3550 | kfree(initfree); | |
3551 | } | |
c7496379 RR |
3552 | } |
3553 | ||
1a7b7d92 RE |
3554 | static int __init modules_wq_init(void) |
3555 | { | |
3556 | INIT_WORK(&init_free_wq, do_free_init); | |
3557 | init_llist_head(&init_free_list); | |
3558 | return 0; | |
3559 | } | |
3560 | module_init(modules_wq_init); | |
3561 | ||
be02a186 JK |
3562 | /* |
3563 | * This is where the real work happens. | |
3564 | * | |
3565 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3566 | * helper command 'lx-symbols'. | |
3567 | */ | |
3568 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3569 | { |
3570 | int ret = 0; | |
c7496379 RR |
3571 | struct mod_initfree *freeinit; |
3572 | ||
3573 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3574 | if (!freeinit) { | |
3575 | ret = -ENOMEM; | |
3576 | goto fail; | |
3577 | } | |
7523e4dc | 3578 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3579 | |
774a1221 TH |
3580 | /* |
3581 | * We want to find out whether @mod uses async during init. Clear | |
3582 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3583 | */ | |
3584 | current->flags &= ~PF_USED_ASYNC; | |
3585 | ||
34e1169d KC |
3586 | do_mod_ctors(mod); |
3587 | /* Start the module */ | |
3588 | if (mod->init != NULL) | |
3589 | ret = do_one_initcall(mod->init); | |
3590 | if (ret < 0) { | |
c7496379 | 3591 | goto fail_free_freeinit; |
34e1169d KC |
3592 | } |
3593 | if (ret > 0) { | |
bddb12b3 AM |
3594 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3595 | "follow 0/-E convention\n" | |
3596 | "%s: loading module anyway...\n", | |
3597 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3598 | dump_stack(); |
3599 | } | |
3600 | ||
3601 | /* Now it's a first class citizen! */ | |
3602 | mod->state = MODULE_STATE_LIVE; | |
3603 | blocking_notifier_call_chain(&module_notify_list, | |
3604 | MODULE_STATE_LIVE, mod); | |
3605 | ||
774a1221 TH |
3606 | /* |
3607 | * We need to finish all async code before the module init sequence | |
3608 | * is done. This has potential to deadlock. For example, a newly | |
3609 | * detected block device can trigger request_module() of the | |
3610 | * default iosched from async probing task. Once userland helper | |
3611 | * reaches here, async_synchronize_full() will wait on the async | |
3612 | * task waiting on request_module() and deadlock. | |
3613 | * | |
3614 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3615 | * iff module init queued any async jobs. This isn't a full | |
3616 | * solution as it will deadlock the same if module loading from | |
3617 | * async jobs nests more than once; however, due to the various | |
3618 | * constraints, this hack seems to be the best option for now. | |
3619 | * Please refer to the following thread for details. | |
3620 | * | |
3621 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3622 | */ | |
f2411da7 | 3623 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3624 | async_synchronize_full(); |
34e1169d | 3625 | |
aba4b5c2 | 3626 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3627 | mod->init_layout.size); |
34e1169d KC |
3628 | mutex_lock(&module_mutex); |
3629 | /* Drop initial reference. */ | |
3630 | module_put(mod); | |
3631 | trim_init_extable(mod); | |
3632 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3633 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3634 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3635 | #endif |
444d13ff | 3636 | module_enable_ro(mod, true); |
93c2e105 | 3637 | mod_tree_remove_init(mod); |
d453cded | 3638 | module_arch_freeing_init(mod); |
7523e4dc RR |
3639 | mod->init_layout.base = NULL; |
3640 | mod->init_layout.size = 0; | |
3641 | mod->init_layout.ro_size = 0; | |
444d13ff | 3642 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3643 | mod->init_layout.text_size = 0; |
c7496379 RR |
3644 | /* |
3645 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3646 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3647 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3648 | * path. module_memfree() cannot be called in an interrupt, so do the |
3649 | * work and call synchronize_rcu() in a work queue. | |
3650 | * | |
ae646f0b JH |
3651 | * Note that module_alloc() on most architectures creates W+X page |
3652 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3653 | * code such as mark_rodata_ro() which depends on those mappings to | |
3654 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3655 | * rcu_barrier() |
c7496379 | 3656 | */ |
1a7b7d92 RE |
3657 | if (llist_add(&freeinit->node, &init_free_list)) |
3658 | schedule_work(&init_free_wq); | |
3659 | ||
34e1169d KC |
3660 | mutex_unlock(&module_mutex); |
3661 | wake_up_all(&module_wq); | |
3662 | ||
3663 | return 0; | |
c7496379 RR |
3664 | |
3665 | fail_free_freeinit: | |
3666 | kfree(freeinit); | |
3667 | fail: | |
3668 | /* Try to protect us from buggy refcounters. */ | |
3669 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3670 | synchronize_rcu(); |
c7496379 RR |
3671 | module_put(mod); |
3672 | blocking_notifier_call_chain(&module_notify_list, | |
3673 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3674 | klp_module_going(mod); |
7dcd182b | 3675 | ftrace_release_mod(mod); |
c7496379 RR |
3676 | free_module(mod); |
3677 | wake_up_all(&module_wq); | |
3678 | return ret; | |
34e1169d KC |
3679 | } |
3680 | ||
3681 | static int may_init_module(void) | |
3682 | { | |
3683 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3684 | return -EPERM; | |
3685 | ||
3686 | return 0; | |
3687 | } | |
3688 | ||
a3535c7e RR |
3689 | /* |
3690 | * We try to place it in the list now to make sure it's unique before | |
3691 | * we dedicate too many resources. In particular, temporary percpu | |
3692 | * memory exhaustion. | |
3693 | */ | |
3694 | static int add_unformed_module(struct module *mod) | |
3695 | { | |
3696 | int err; | |
3697 | struct module *old; | |
3698 | ||
3699 | mod->state = MODULE_STATE_UNFORMED; | |
3700 | ||
3701 | again: | |
3702 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3703 | old = find_module_all(mod->name, strlen(mod->name), true); |
3704 | if (old != NULL) { | |
6e6de3de | 3705 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
3706 | /* Wait in case it fails to load. */ |
3707 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3708 | err = wait_event_interruptible(module_wq, |
3709 | finished_loading(mod->name)); | |
a3535c7e RR |
3710 | if (err) |
3711 | goto out_unlocked; | |
3712 | goto again; | |
3713 | } | |
3714 | err = -EEXIST; | |
3715 | goto out; | |
3716 | } | |
4f666546 | 3717 | mod_update_bounds(mod); |
a3535c7e | 3718 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3719 | mod_tree_insert(mod); |
a3535c7e RR |
3720 | err = 0; |
3721 | ||
3722 | out: | |
3723 | mutex_unlock(&module_mutex); | |
3724 | out_unlocked: | |
3725 | return err; | |
3726 | } | |
3727 | ||
3728 | static int complete_formation(struct module *mod, struct load_info *info) | |
3729 | { | |
3730 | int err; | |
3731 | ||
3732 | mutex_lock(&module_mutex); | |
3733 | ||
3734 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3735 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3736 | if (err < 0) |
3737 | goto out; | |
3738 | ||
3739 | /* This relies on module_mutex for list integrity. */ | |
3740 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3741 | ||
444d13ff | 3742 | module_enable_ro(mod, false); |
85c898db | 3743 | module_enable_nx(mod); |
af742623 | 3744 | module_enable_x(mod); |
4982223e | 3745 | |
a3535c7e RR |
3746 | /* Mark state as coming so strong_try_module_get() ignores us, |
3747 | * but kallsyms etc. can see us. */ | |
3748 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3749 | mutex_unlock(&module_mutex); |
3750 | ||
4982223e | 3751 | return 0; |
a3535c7e RR |
3752 | |
3753 | out: | |
3754 | mutex_unlock(&module_mutex); | |
3755 | return err; | |
3756 | } | |
3757 | ||
4c973d16 JY |
3758 | static int prepare_coming_module(struct module *mod) |
3759 | { | |
7e545d6e JY |
3760 | int err; |
3761 | ||
4c973d16 | 3762 | ftrace_module_enable(mod); |
7e545d6e JY |
3763 | err = klp_module_coming(mod); |
3764 | if (err) | |
3765 | return err; | |
3766 | ||
4c973d16 JY |
3767 | blocking_notifier_call_chain(&module_notify_list, |
3768 | MODULE_STATE_COMING, mod); | |
3769 | return 0; | |
3770 | } | |
3771 | ||
ecc86170 LR |
3772 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3773 | void *arg) | |
54041d8a | 3774 | { |
f2411da7 LR |
3775 | struct module *mod = arg; |
3776 | int ret; | |
3777 | ||
3778 | if (strcmp(param, "async_probe") == 0) { | |
3779 | mod->async_probe_requested = true; | |
3780 | return 0; | |
3781 | } | |
3782 | ||
6da0b565 | 3783 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3784 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3785 | if (ret != 0) |
3786 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3787 | return 0; |
3788 | } | |
3789 | ||
d913188c RR |
3790 | /* Allocate and load the module: note that size of section 0 is always |
3791 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3792 | static int load_module(struct load_info *info, const char __user *uargs, |
3793 | int flags) | |
d913188c | 3794 | { |
a3535c7e | 3795 | struct module *mod; |
5fdc7db6 | 3796 | long err = 0; |
51e158c1 | 3797 | char *after_dashes; |
d913188c | 3798 | |
5fdc7db6 JY |
3799 | err = elf_header_check(info); |
3800 | if (err) | |
3801 | goto free_copy; | |
3802 | ||
3803 | err = setup_load_info(info, flags); | |
3804 | if (err) | |
3805 | goto free_copy; | |
3806 | ||
3807 | if (blacklisted(info->name)) { | |
3808 | err = -EPERM; | |
3809 | goto free_copy; | |
3810 | } | |
3811 | ||
bca014ca | 3812 | err = module_sig_check(info, flags); |
34e1169d KC |
3813 | if (err) |
3814 | goto free_copy; | |
d913188c | 3815 | |
5fdc7db6 | 3816 | err = rewrite_section_headers(info, flags); |
d913188c | 3817 | if (err) |
34e1169d | 3818 | goto free_copy; |
d913188c | 3819 | |
5fdc7db6 JY |
3820 | /* Check module struct version now, before we try to use module. */ |
3821 | if (!check_modstruct_version(info, info->mod)) { | |
3822 | err = -ENOEXEC; | |
3823 | goto free_copy; | |
3824 | } | |
3825 | ||
d913188c | 3826 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3827 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3828 | if (IS_ERR(mod)) { |
3829 | err = PTR_ERR(mod); | |
d913188c | 3830 | goto free_copy; |
1da177e4 | 3831 | } |
1da177e4 | 3832 | |
ca86cad7 RGB |
3833 | audit_log_kern_module(mod->name); |
3834 | ||
a3535c7e RR |
3835 | /* Reserve our place in the list. */ |
3836 | err = add_unformed_module(mod); | |
3837 | if (err) | |
1fb9341a | 3838 | goto free_module; |
1fb9341a | 3839 | |
106a4ee2 | 3840 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3841 | mod->sig_ok = info->sig_ok; |
64748a2c | 3842 | if (!mod->sig_ok) { |
bddb12b3 | 3843 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3844 | "and/or required key missing - tainting " |
bddb12b3 | 3845 | "kernel\n", mod->name); |
66cc69e3 | 3846 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3847 | } |
106a4ee2 RR |
3848 | #endif |
3849 | ||
8d8022e8 | 3850 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3851 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3852 | if (err) |
3853 | goto unlink_mod; | |
3854 | ||
49668688 | 3855 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3856 | err = module_unload_init(mod); |
3857 | if (err) | |
1fb9341a | 3858 | goto unlink_mod; |
1da177e4 | 3859 | |
cf2fde7b | 3860 | init_param_lock(mod); |
b51d23e4 | 3861 | |
22e268eb RR |
3862 | /* Now we've got everything in the final locations, we can |
3863 | * find optional sections. */ | |
eb3057df FH |
3864 | err = find_module_sections(mod, info); |
3865 | if (err) | |
3866 | goto free_unload; | |
9b37ccfc | 3867 | |
49668688 | 3868 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3869 | if (err) |
3870 | goto free_unload; | |
9841d61d | 3871 | |
c988d2b2 | 3872 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3873 | setup_modinfo(mod, info); |
c988d2b2 | 3874 | |
1da177e4 | 3875 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3876 | err = simplify_symbols(mod, info); |
1da177e4 | 3877 | if (err < 0) |
d913188c | 3878 | goto free_modinfo; |
1da177e4 | 3879 | |
34e1169d | 3880 | err = apply_relocations(mod, info); |
22e268eb | 3881 | if (err < 0) |
d913188c | 3882 | goto free_modinfo; |
1da177e4 | 3883 | |
34e1169d | 3884 | err = post_relocation(mod, info); |
1da177e4 | 3885 | if (err < 0) |
d913188c | 3886 | goto free_modinfo; |
1da177e4 | 3887 | |
22e268eb | 3888 | flush_module_icache(mod); |
378bac82 | 3889 | |
6526c534 RR |
3890 | /* Now copy in args */ |
3891 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3892 | if (IS_ERR(mod->args)) { | |
3893 | err = PTR_ERR(mod->args); | |
3894 | goto free_arch_cleanup; | |
3895 | } | |
8d3b33f6 | 3896 | |
52796312 | 3897 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3898 | |
a949ae56 SRRH |
3899 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3900 | ftrace_module_init(mod); | |
3901 | ||
a3535c7e RR |
3902 | /* Finally it's fully formed, ready to start executing. */ |
3903 | err = complete_formation(mod, info); | |
3904 | if (err) | |
1fb9341a | 3905 | goto ddebug_cleanup; |
be593f4c | 3906 | |
4c973d16 JY |
3907 | err = prepare_coming_module(mod); |
3908 | if (err) | |
3909 | goto bug_cleanup; | |
3910 | ||
51f3d0f4 | 3911 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3912 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3913 | -32768, 32767, mod, |
ecc86170 | 3914 | unknown_module_param_cb); |
51e158c1 RR |
3915 | if (IS_ERR(after_dashes)) { |
3916 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3917 | goto coming_cleanup; |
51e158c1 RR |
3918 | } else if (after_dashes) { |
3919 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3920 | mod->name, after_dashes); | |
3921 | } | |
1da177e4 | 3922 | |
ca86cad7 | 3923 | /* Link in to sysfs. */ |
34e1169d | 3924 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3925 | if (err < 0) |
4c973d16 | 3926 | goto coming_cleanup; |
80a3d1bb | 3927 | |
1ce15ef4 JY |
3928 | if (is_livepatch_module(mod)) { |
3929 | err = copy_module_elf(mod, info); | |
3930 | if (err < 0) | |
3931 | goto sysfs_cleanup; | |
3932 | } | |
3933 | ||
48fd1188 | 3934 | /* Get rid of temporary copy. */ |
34e1169d | 3935 | free_copy(info); |
1da177e4 LT |
3936 | |
3937 | /* Done! */ | |
51f3d0f4 | 3938 | trace_module_load(mod); |
34e1169d KC |
3939 | |
3940 | return do_init_module(mod); | |
1da177e4 | 3941 | |
1ce15ef4 JY |
3942 | sysfs_cleanup: |
3943 | mod_sysfs_teardown(mod); | |
4c973d16 | 3944 | coming_cleanup: |
885a78d4 | 3945 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3946 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3947 | blocking_notifier_call_chain(&module_notify_list, |
3948 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3949 | klp_module_going(mod); |
1fb9341a RR |
3950 | bug_cleanup: |
3951 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3952 | mutex_lock(&module_mutex); |
5336377d | 3953 | module_bug_cleanup(mod); |
ee61abb3 | 3954 | mutex_unlock(&module_mutex); |
ff7e0055 | 3955 | |
a3535c7e | 3956 | ddebug_cleanup: |
1323eac7 | 3957 | ftrace_release_mod(mod); |
52796312 | 3958 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 3959 | synchronize_rcu(); |
6526c534 RR |
3960 | kfree(mod->args); |
3961 | free_arch_cleanup: | |
1da177e4 | 3962 | module_arch_cleanup(mod); |
d913188c | 3963 | free_modinfo: |
a263f776 | 3964 | free_modinfo(mod); |
22e268eb | 3965 | free_unload: |
1da177e4 | 3966 | module_unload_free(mod); |
1fb9341a RR |
3967 | unlink_mod: |
3968 | mutex_lock(&module_mutex); | |
3969 | /* Unlink carefully: kallsyms could be walking list. */ | |
3970 | list_del_rcu(&mod->list); | |
758556bd | 3971 | mod_tree_remove(mod); |
1fb9341a | 3972 | wake_up_all(&module_wq); |
0be964be | 3973 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 3974 | synchronize_rcu(); |
1fb9341a | 3975 | mutex_unlock(&module_mutex); |
d913188c | 3976 | free_module: |
35a9393c | 3977 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3978 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3979 | |
34e1169d | 3980 | module_deallocate(mod, info); |
d913188c | 3981 | free_copy: |
34e1169d KC |
3982 | free_copy(info); |
3983 | return err; | |
b99b87f7 PO |
3984 | } |
3985 | ||
17da2bd9 HC |
3986 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3987 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3988 | { |
34e1169d KC |
3989 | int err; |
3990 | struct load_info info = { }; | |
1da177e4 | 3991 | |
34e1169d KC |
3992 | err = may_init_module(); |
3993 | if (err) | |
3994 | return err; | |
1da177e4 | 3995 | |
34e1169d KC |
3996 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3997 | umod, len, uargs); | |
1da177e4 | 3998 | |
34e1169d KC |
3999 | err = copy_module_from_user(umod, len, &info); |
4000 | if (err) | |
4001 | return err; | |
1da177e4 | 4002 | |
2f3238ae | 4003 | return load_module(&info, uargs, 0); |
34e1169d | 4004 | } |
94462ad3 | 4005 | |
2f3238ae | 4006 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 4007 | { |
34e1169d | 4008 | struct load_info info = { }; |
a1db7420 MZ |
4009 | loff_t size; |
4010 | void *hdr; | |
4011 | int err; | |
94462ad3 | 4012 | |
34e1169d KC |
4013 | err = may_init_module(); |
4014 | if (err) | |
4015 | return err; | |
1da177e4 | 4016 | |
2f3238ae | 4017 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 4018 | |
2f3238ae RR |
4019 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
4020 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
4021 | return -EINVAL; | |
d6de2c80 | 4022 | |
a1db7420 MZ |
4023 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
4024 | READING_MODULE); | |
34e1169d KC |
4025 | if (err) |
4026 | return err; | |
a1db7420 MZ |
4027 | info.hdr = hdr; |
4028 | info.len = size; | |
1da177e4 | 4029 | |
2f3238ae | 4030 | return load_module(&info, uargs, flags); |
1da177e4 LT |
4031 | } |
4032 | ||
4033 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
4034 | { | |
4035 | return ((void *)addr >= start && (void *)addr < start + size); | |
4036 | } | |
4037 | ||
4038 | #ifdef CONFIG_KALLSYMS | |
4039 | /* | |
4040 | * This ignores the intensely annoying "mapping symbols" found | |
4041 | * in ARM ELF files: $a, $t and $d. | |
4042 | */ | |
4043 | static inline int is_arm_mapping_symbol(const char *str) | |
4044 | { | |
2e3a10a1 RK |
4045 | if (str[0] == '.' && str[1] == 'L') |
4046 | return true; | |
6c34f1f5 | 4047 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
4048 | && (str[2] == '\0' || str[2] == '.'); |
4049 | } | |
4050 | ||
2d25bc55 | 4051 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 4052 | { |
8244062e | 4053 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
4054 | } |
4055 | ||
2d25bc55 JY |
4056 | /* |
4057 | * Given a module and address, find the corresponding symbol and return its name | |
4058 | * while providing its size and offset if needed. | |
4059 | */ | |
4060 | static const char *find_kallsyms_symbol(struct module *mod, | |
4061 | unsigned long addr, | |
4062 | unsigned long *size, | |
4063 | unsigned long *offset) | |
1da177e4 LT |
4064 | { |
4065 | unsigned int i, best = 0; | |
93d77e7f | 4066 | unsigned long nextval, bestval; |
8244062e | 4067 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
4068 | |
4069 | /* At worse, next value is at end of module */ | |
a06f6211 | 4070 | if (within_module_init(addr, mod)) |
7523e4dc | 4071 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 4072 | else |
7523e4dc | 4073 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 4074 | |
93d77e7f VW |
4075 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
4076 | ||
25985edc | 4077 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 4078 | starts real symbols at 1). */ |
8244062e | 4079 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
4080 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
4081 | unsigned long thisval = kallsyms_symbol_value(sym); | |
4082 | ||
4083 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
4084 | continue; |
4085 | ||
4086 | /* We ignore unnamed symbols: they're uninformative | |
4087 | * and inserted at a whim. */ | |
2d25bc55 JY |
4088 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
4089 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
4090 | continue; |
4091 | ||
93d77e7f | 4092 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 4093 | best = i; |
93d77e7f VW |
4094 | bestval = thisval; |
4095 | } | |
4096 | if (thisval > addr && thisval < nextval) | |
4097 | nextval = thisval; | |
1da177e4 LT |
4098 | } |
4099 | ||
4100 | if (!best) | |
4101 | return NULL; | |
4102 | ||
ffb45122 | 4103 | if (size) |
93d77e7f | 4104 | *size = nextval - bestval; |
ffb45122 | 4105 | if (offset) |
93d77e7f | 4106 | *offset = addr - bestval; |
2d25bc55 JY |
4107 | |
4108 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
4109 | } |
4110 | ||
b865ea64 SS |
4111 | void * __weak dereference_module_function_descriptor(struct module *mod, |
4112 | void *ptr) | |
4113 | { | |
4114 | return ptr; | |
4115 | } | |
4116 | ||
6dd06c9f RR |
4117 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
4118 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 4119 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
4120 | unsigned long *size, |
4121 | unsigned long *offset, | |
4122 | char **modname, | |
4123 | char *namebuf) | |
1da177e4 | 4124 | { |
cb2a5205 | 4125 | const char *ret = NULL; |
b7df4d1b | 4126 | struct module *mod; |
1da177e4 | 4127 | |
cb2a5205 | 4128 | preempt_disable(); |
b7df4d1b PZ |
4129 | mod = __module_address(addr); |
4130 | if (mod) { | |
4131 | if (modname) | |
4132 | *modname = mod->name; | |
2d25bc55 JY |
4133 | |
4134 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4135 | } |
6dd06c9f RR |
4136 | /* Make a copy in here where it's safe */ |
4137 | if (ret) { | |
4138 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4139 | ret = namebuf; | |
4140 | } | |
cb2a5205 | 4141 | preempt_enable(); |
b7df4d1b | 4142 | |
92dfc9dc | 4143 | return ret; |
1da177e4 LT |
4144 | } |
4145 | ||
9d65cb4a AD |
4146 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4147 | { | |
4148 | struct module *mod; | |
4149 | ||
cb2a5205 | 4150 | preempt_disable(); |
d72b3751 | 4151 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4152 | if (mod->state == MODULE_STATE_UNFORMED) |
4153 | continue; | |
9b20a352 | 4154 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4155 | const char *sym; |
4156 | ||
2d25bc55 | 4157 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4158 | if (!sym) |
4159 | goto out; | |
2d25bc55 | 4160 | |
9281acea | 4161 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4162 | preempt_enable(); |
9d65cb4a AD |
4163 | return 0; |
4164 | } | |
4165 | } | |
4166 | out: | |
cb2a5205 | 4167 | preempt_enable(); |
9d65cb4a AD |
4168 | return -ERANGE; |
4169 | } | |
4170 | ||
a5c43dae AD |
4171 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4172 | unsigned long *offset, char *modname, char *name) | |
4173 | { | |
4174 | struct module *mod; | |
4175 | ||
cb2a5205 | 4176 | preempt_disable(); |
d72b3751 | 4177 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4178 | if (mod->state == MODULE_STATE_UNFORMED) |
4179 | continue; | |
9b20a352 | 4180 | if (within_module(addr, mod)) { |
a5c43dae AD |
4181 | const char *sym; |
4182 | ||
2d25bc55 | 4183 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4184 | if (!sym) |
4185 | goto out; | |
4186 | if (modname) | |
9281acea | 4187 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4188 | if (name) |
9281acea | 4189 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4190 | preempt_enable(); |
a5c43dae AD |
4191 | return 0; |
4192 | } | |
4193 | } | |
4194 | out: | |
cb2a5205 | 4195 | preempt_enable(); |
a5c43dae AD |
4196 | return -ERANGE; |
4197 | } | |
4198 | ||
ea07890a AD |
4199 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4200 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4201 | { |
4202 | struct module *mod; | |
4203 | ||
cb2a5205 | 4204 | preempt_disable(); |
d72b3751 | 4205 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4206 | struct mod_kallsyms *kallsyms; |
4207 | ||
0d21b0e3 RR |
4208 | if (mod->state == MODULE_STATE_UNFORMED) |
4209 | continue; | |
8244062e RR |
4210 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4211 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4212 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4213 | ||
4214 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4215 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4216 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4217 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4218 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4219 | preempt_enable(); |
ea07890a | 4220 | return 0; |
1da177e4 | 4221 | } |
8244062e | 4222 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4223 | } |
cb2a5205 | 4224 | preempt_enable(); |
ea07890a | 4225 | return -ERANGE; |
1da177e4 LT |
4226 | } |
4227 | ||
2d25bc55 JY |
4228 | /* Given a module and name of symbol, find and return the symbol's value */ |
4229 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4230 | { |
4231 | unsigned int i; | |
8244062e | 4232 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4233 | |
93d77e7f VW |
4234 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4235 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4236 | ||
2d25bc55 | 4237 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4238 | sym->st_shndx != SHN_UNDEF) |
4239 | return kallsyms_symbol_value(sym); | |
4240 | } | |
1da177e4 LT |
4241 | return 0; |
4242 | } | |
4243 | ||
4244 | /* Look for this name: can be of form module:name. */ | |
4245 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4246 | { | |
4247 | struct module *mod; | |
4248 | char *colon; | |
4249 | unsigned long ret = 0; | |
4250 | ||
4251 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4252 | preempt_disable(); |
17586188 | 4253 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4254 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4255 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4256 | } else { |
0d21b0e3 RR |
4257 | list_for_each_entry_rcu(mod, &modules, list) { |
4258 | if (mod->state == MODULE_STATE_UNFORMED) | |
4259 | continue; | |
2d25bc55 | 4260 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4261 | break; |
0d21b0e3 | 4262 | } |
1da177e4 | 4263 | } |
cb2a5205 | 4264 | preempt_enable(); |
1da177e4 LT |
4265 | return ret; |
4266 | } | |
75a66614 AK |
4267 | |
4268 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4269 | struct module *, unsigned long), | |
4270 | void *data) | |
4271 | { | |
4272 | struct module *mod; | |
4273 | unsigned int i; | |
4274 | int ret; | |
4275 | ||
0be964be PZ |
4276 | module_assert_mutex(); |
4277 | ||
75a66614 | 4278 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4279 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4280 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4281 | ||
0d21b0e3 RR |
4282 | if (mod->state == MODULE_STATE_UNFORMED) |
4283 | continue; | |
8244062e | 4284 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4285 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4286 | |
93d77e7f | 4287 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4288 | continue; |
4289 | ||
2d25bc55 | 4290 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4291 | mod, kallsyms_symbol_value(sym)); |
75a66614 AK |
4292 | if (ret != 0) |
4293 | return ret; | |
4294 | } | |
4295 | } | |
4296 | return 0; | |
4297 | } | |
1da177e4 LT |
4298 | #endif /* CONFIG_KALLSYMS */ |
4299 | ||
7fd8329b PM |
4300 | /* Maximum number of characters written by module_flags() */ |
4301 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4302 | ||
4303 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4304 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4305 | { |
4306 | int bx = 0; | |
4307 | ||
0d21b0e3 | 4308 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4309 | if (mod->taints || |
4310 | mod->state == MODULE_STATE_GOING || | |
4311 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4312 | buf[bx++] = '('; |
cca3e707 | 4313 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4314 | /* Show a - for module-is-being-unloaded */ |
4315 | if (mod->state == MODULE_STATE_GOING) | |
4316 | buf[bx++] = '-'; | |
4317 | /* Show a + for module-is-being-loaded */ | |
4318 | if (mod->state == MODULE_STATE_COMING) | |
4319 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4320 | buf[bx++] = ')'; |
4321 | } | |
4322 | buf[bx] = '\0'; | |
4323 | ||
4324 | return buf; | |
4325 | } | |
4326 | ||
3b5d5c6b AD |
4327 | #ifdef CONFIG_PROC_FS |
4328 | /* Called by the /proc file system to return a list of modules. */ | |
4329 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4330 | { | |
4331 | mutex_lock(&module_mutex); | |
4332 | return seq_list_start(&modules, *pos); | |
4333 | } | |
4334 | ||
4335 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4336 | { | |
4337 | return seq_list_next(p, &modules, pos); | |
4338 | } | |
4339 | ||
4340 | static void m_stop(struct seq_file *m, void *p) | |
4341 | { | |
4342 | mutex_unlock(&module_mutex); | |
4343 | } | |
4344 | ||
1da177e4 LT |
4345 | static int m_show(struct seq_file *m, void *p) |
4346 | { | |
4347 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4348 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4349 | void *value; |
fa3ba2e8 | 4350 | |
0d21b0e3 RR |
4351 | /* We always ignore unformed modules. */ |
4352 | if (mod->state == MODULE_STATE_UNFORMED) | |
4353 | return 0; | |
4354 | ||
2f0f2a33 | 4355 | seq_printf(m, "%s %u", |
7523e4dc | 4356 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4357 | print_unload_info(m, mod); |
4358 | ||
4359 | /* Informative for users. */ | |
4360 | seq_printf(m, " %s", | |
6da0b565 IA |
4361 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4362 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4363 | "Live"); |
4364 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4365 | value = m->private ? NULL : mod->core_layout.base; |
4366 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4367 | |
fa3ba2e8 FM |
4368 | /* Taints info */ |
4369 | if (mod->taints) | |
21aa9280 | 4370 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4371 | |
6da0b565 | 4372 | seq_puts(m, "\n"); |
1da177e4 LT |
4373 | return 0; |
4374 | } | |
4375 | ||
4376 | /* Format: modulename size refcount deps address | |
4377 | ||
4378 | Where refcount is a number or -, and deps is a comma-separated list | |
4379 | of depends or -. | |
4380 | */ | |
3b5d5c6b | 4381 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4382 | .start = m_start, |
4383 | .next = m_next, | |
4384 | .stop = m_stop, | |
4385 | .show = m_show | |
4386 | }; | |
4387 | ||
516fb7f2 LT |
4388 | /* |
4389 | * This also sets the "private" pointer to non-NULL if the | |
4390 | * kernel pointers should be hidden (so you can just test | |
4391 | * "m->private" to see if you should keep the values private). | |
4392 | * | |
4393 | * We use the same logic as for /proc/kallsyms. | |
4394 | */ | |
3b5d5c6b AD |
4395 | static int modules_open(struct inode *inode, struct file *file) |
4396 | { | |
516fb7f2 LT |
4397 | int err = seq_open(file, &modules_op); |
4398 | ||
4399 | if (!err) { | |
4400 | struct seq_file *m = file->private_data; | |
b25a7c5a | 4401 | m->private = kallsyms_show_value(file->f_cred) ? NULL : (void *)8ul; |
516fb7f2 LT |
4402 | } |
4403 | ||
3f553b30 | 4404 | return err; |
3b5d5c6b AD |
4405 | } |
4406 | ||
97a32539 | 4407 | static const struct proc_ops modules_proc_ops = { |
d919b33d | 4408 | .proc_flags = PROC_ENTRY_PERMANENT, |
97a32539 AD |
4409 | .proc_open = modules_open, |
4410 | .proc_read = seq_read, | |
4411 | .proc_lseek = seq_lseek, | |
4412 | .proc_release = seq_release, | |
3b5d5c6b AD |
4413 | }; |
4414 | ||
4415 | static int __init proc_modules_init(void) | |
4416 | { | |
97a32539 | 4417 | proc_create("modules", 0, NULL, &modules_proc_ops); |
3b5d5c6b AD |
4418 | return 0; |
4419 | } | |
4420 | module_init(proc_modules_init); | |
4421 | #endif | |
4422 | ||
1da177e4 LT |
4423 | /* Given an address, look for it in the module exception tables. */ |
4424 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4425 | { | |
1da177e4 LT |
4426 | const struct exception_table_entry *e = NULL; |
4427 | struct module *mod; | |
4428 | ||
24da1cbf | 4429 | preempt_disable(); |
5ff22646 PZ |
4430 | mod = __module_address(addr); |
4431 | if (!mod) | |
4432 | goto out; | |
22a8bdeb | 4433 | |
5ff22646 PZ |
4434 | if (!mod->num_exentries) |
4435 | goto out; | |
4436 | ||
4437 | e = search_extable(mod->extable, | |
a94c33dd | 4438 | mod->num_exentries, |
5ff22646 PZ |
4439 | addr); |
4440 | out: | |
24da1cbf | 4441 | preempt_enable(); |
1da177e4 | 4442 | |
5ff22646 PZ |
4443 | /* |
4444 | * Now, if we found one, we are running inside it now, hence | |
4445 | * we cannot unload the module, hence no refcnt needed. | |
4446 | */ | |
1da177e4 LT |
4447 | return e; |
4448 | } | |
4449 | ||
4d435f9d | 4450 | /* |
e610499e RR |
4451 | * is_module_address - is this address inside a module? |
4452 | * @addr: the address to check. | |
4453 | * | |
4454 | * See is_module_text_address() if you simply want to see if the address | |
4455 | * is code (not data). | |
4d435f9d | 4456 | */ |
e610499e | 4457 | bool is_module_address(unsigned long addr) |
4d435f9d | 4458 | { |
e610499e | 4459 | bool ret; |
4d435f9d | 4460 | |
24da1cbf | 4461 | preempt_disable(); |
e610499e | 4462 | ret = __module_address(addr) != NULL; |
24da1cbf | 4463 | preempt_enable(); |
4d435f9d | 4464 | |
e610499e | 4465 | return ret; |
4d435f9d IM |
4466 | } |
4467 | ||
e610499e RR |
4468 | /* |
4469 | * __module_address - get the module which contains an address. | |
4470 | * @addr: the address. | |
4471 | * | |
4472 | * Must be called with preempt disabled or module mutex held so that | |
4473 | * module doesn't get freed during this. | |
4474 | */ | |
714f83d5 | 4475 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4476 | { |
4477 | struct module *mod; | |
4478 | ||
3a642e99 RR |
4479 | if (addr < module_addr_min || addr > module_addr_max) |
4480 | return NULL; | |
4481 | ||
0be964be PZ |
4482 | module_assert_mutex_or_preempt(); |
4483 | ||
6c9692e2 | 4484 | mod = mod_find(addr); |
93c2e105 PZ |
4485 | if (mod) { |
4486 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4487 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4488 | mod = NULL; |
0d21b0e3 | 4489 | } |
93c2e105 | 4490 | return mod; |
1da177e4 | 4491 | } |
c6b37801 | 4492 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4493 | |
e610499e RR |
4494 | /* |
4495 | * is_module_text_address - is this address inside module code? | |
4496 | * @addr: the address to check. | |
4497 | * | |
4498 | * See is_module_address() if you simply want to see if the address is | |
4499 | * anywhere in a module. See kernel_text_address() for testing if an | |
4500 | * address corresponds to kernel or module code. | |
4501 | */ | |
4502 | bool is_module_text_address(unsigned long addr) | |
4503 | { | |
4504 | bool ret; | |
4505 | ||
4506 | preempt_disable(); | |
4507 | ret = __module_text_address(addr) != NULL; | |
4508 | preempt_enable(); | |
4509 | ||
4510 | return ret; | |
4511 | } | |
4512 | ||
4513 | /* | |
4514 | * __module_text_address - get the module whose code contains an address. | |
4515 | * @addr: the address. | |
4516 | * | |
4517 | * Must be called with preempt disabled or module mutex held so that | |
4518 | * module doesn't get freed during this. | |
4519 | */ | |
4520 | struct module *__module_text_address(unsigned long addr) | |
4521 | { | |
4522 | struct module *mod = __module_address(addr); | |
4523 | if (mod) { | |
4524 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4525 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4526 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4527 | mod = NULL; |
4528 | } | |
4529 | return mod; | |
4530 | } | |
c6b37801 | 4531 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4532 | |
1da177e4 LT |
4533 | /* Don't grab lock, we're oopsing. */ |
4534 | void print_modules(void) | |
4535 | { | |
4536 | struct module *mod; | |
7fd8329b | 4537 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4538 | |
b231125a | 4539 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4540 | /* Most callers should already have preempt disabled, but make sure */ |
4541 | preempt_disable(); | |
0d21b0e3 RR |
4542 | list_for_each_entry_rcu(mod, &modules, list) { |
4543 | if (mod->state == MODULE_STATE_UNFORMED) | |
4544 | continue; | |
27bba4d6 | 4545 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4546 | } |
d72b3751 | 4547 | preempt_enable(); |
e14af7ee | 4548 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4549 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4550 | pr_cont("\n"); | |
1da177e4 LT |
4551 | } |
4552 | ||
1da177e4 | 4553 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4554 | /* Generate the signature for all relevant module structures here. |
4555 | * If these change, we don't want to try to parse the module. */ | |
4556 | void module_layout(struct module *mod, | |
4557 | struct modversion_info *ver, | |
4558 | struct kernel_param *kp, | |
4559 | struct kernel_symbol *ks, | |
65498646 | 4560 | struct tracepoint * const *tp) |
8c8ef42a RR |
4561 | { |
4562 | } | |
4563 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4564 | #endif |