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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. */ |
a54e0491 | 425 | static bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
de4d8d53 RR |
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 | } | |
487 | ||
488 | struct find_symbol_arg { | |
489 | /* Input */ | |
490 | const char *name; | |
491 | bool gplok; | |
492 | bool warn; | |
493 | ||
494 | /* Output */ | |
495 | struct module *owner; | |
71810db2 | 496 | const s32 *crc; |
414fd31b | 497 | const struct kernel_symbol *sym; |
ef1dac60 | 498 | enum mod_license license; |
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 | 507 | if (!fsa->gplok) { |
cd8732cd | 508 | if (syms->license == GPL_ONLY) |
dafd0940 | 509 | return false; |
cd8732cd | 510 | if (syms->license == 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]; |
ef1dac60 | 532 | fsa->license = syms->license; |
dafd0940 RR |
533 | return true; |
534 | } | |
535 | ||
7290d580 AB |
536 | static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
537 | { | |
538 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
539 | return (unsigned long)offset_to_ptr(&sym->value_offset); | |
540 | #else | |
541 | return sym->value; | |
542 | #endif | |
543 | } | |
544 | ||
545 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) | |
546 | { | |
547 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
548 | return offset_to_ptr(&sym->name_offset); | |
549 | #else | |
550 | return sym->name; | |
551 | #endif | |
552 | } | |
553 | ||
8651ec01 MM |
554 | static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
555 | { | |
556 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
069e1c07 WD |
557 | if (!sym->namespace_offset) |
558 | return NULL; | |
8651ec01 MM |
559 | return offset_to_ptr(&sym->namespace_offset); |
560 | #else | |
561 | return sym->namespace; | |
562 | #endif | |
563 | } | |
564 | ||
b605be65 | 565 | static int cmp_name(const void *name, const void *sym) |
403ed278 | 566 | { |
b605be65 | 567 | return strcmp(name, kernel_symbol_name(sym)); |
403ed278 AIB |
568 | } |
569 | ||
2d25bc55 JY |
570 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
571 | struct module *owner, | |
572 | void *data) | |
de4d8d53 RR |
573 | { |
574 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
575 | struct kernel_symbol *sym; |
576 | ||
577 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
578 | sizeof(struct kernel_symbol), cmp_name); | |
579 | ||
2d25bc55 JY |
580 | if (sym != NULL && check_exported_symbol(syms, owner, |
581 | sym - syms->start, data)) | |
403ed278 | 582 | return true; |
de4d8d53 | 583 | |
de4d8d53 RR |
584 | return false; |
585 | } | |
586 | ||
2d25bc55 | 587 | /* Find an exported symbol and return it, along with, (optional) crc and |
75676500 | 588 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
77311047 | 589 | static const struct kernel_symbol *find_symbol(const char *name, |
c6b37801 | 590 | struct module **owner, |
71810db2 | 591 | const s32 **crc, |
ef1dac60 | 592 | enum mod_license *license, |
c6b37801 TA |
593 | bool gplok, |
594 | bool warn) | |
dafd0940 RR |
595 | { |
596 | struct find_symbol_arg fsa; | |
597 | ||
598 | fsa.name = name; | |
599 | fsa.gplok = gplok; | |
600 | fsa.warn = warn; | |
601 | ||
2d25bc55 | 602 | if (each_symbol_section(find_exported_symbol_in_section, &fsa)) { |
dafd0940 RR |
603 | if (owner) |
604 | *owner = fsa.owner; | |
605 | if (crc) | |
606 | *crc = fsa.crc; | |
ef1dac60 CH |
607 | if (license) |
608 | *license = fsa.license; | |
414fd31b | 609 | return fsa.sym; |
dafd0940 RR |
610 | } |
611 | ||
5e124169 | 612 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 613 | return NULL; |
1da177e4 LT |
614 | } |
615 | ||
fe0d34d2 RR |
616 | /* |
617 | * Search for module by name: must hold module_mutex (or preempt disabled | |
618 | * for read-only access). | |
619 | */ | |
4f6de4d5 | 620 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 621 | bool even_unformed) |
1da177e4 LT |
622 | { |
623 | struct module *mod; | |
624 | ||
fe0d34d2 | 625 | module_assert_mutex_or_preempt(); |
0be964be | 626 | |
bf08949c MH |
627 | list_for_each_entry_rcu(mod, &modules, list, |
628 | lockdep_is_held(&module_mutex)) { | |
0d21b0e3 RR |
629 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
630 | continue; | |
4f6de4d5 | 631 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
632 | return mod; |
633 | } | |
634 | return NULL; | |
635 | } | |
0d21b0e3 RR |
636 | |
637 | struct module *find_module(const char *name) | |
638 | { | |
fe0d34d2 | 639 | module_assert_mutex(); |
4f6de4d5 | 640 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 641 | } |
c6b37801 | 642 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
643 | |
644 | #ifdef CONFIG_SMP | |
fbf59bc9 | 645 | |
259354de | 646 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 647 | { |
259354de TH |
648 | return mod->percpu; |
649 | } | |
fbf59bc9 | 650 | |
9eb76d77 | 651 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 652 | { |
9eb76d77 RR |
653 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
654 | unsigned long align = pcpusec->sh_addralign; | |
655 | ||
656 | if (!pcpusec->sh_size) | |
657 | return 0; | |
658 | ||
fbf59bc9 | 659 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
660 | pr_warn("%s: per-cpu alignment %li > %li\n", |
661 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
662 | align = PAGE_SIZE; |
663 | } | |
664 | ||
9eb76d77 | 665 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 666 | if (!mod->percpu) { |
bddb12b3 AM |
667 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
668 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
669 | return -ENOMEM; |
670 | } | |
9eb76d77 | 671 | mod->percpu_size = pcpusec->sh_size; |
259354de | 672 | return 0; |
fbf59bc9 TH |
673 | } |
674 | ||
259354de | 675 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 676 | { |
259354de | 677 | free_percpu(mod->percpu); |
fbf59bc9 TH |
678 | } |
679 | ||
49668688 | 680 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 681 | { |
49668688 | 682 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
683 | } |
684 | ||
259354de TH |
685 | static void percpu_modcopy(struct module *mod, |
686 | const void *from, unsigned long size) | |
6b588c18 TH |
687 | { |
688 | int cpu; | |
689 | ||
690 | for_each_possible_cpu(cpu) | |
259354de | 691 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
692 | } |
693 | ||
383776fa | 694 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
695 | { |
696 | struct module *mod; | |
697 | unsigned int cpu; | |
698 | ||
699 | preempt_disable(); | |
700 | ||
701 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
702 | if (mod->state == MODULE_STATE_UNFORMED) |
703 | continue; | |
10fad5e4 TH |
704 | if (!mod->percpu_size) |
705 | continue; | |
706 | for_each_possible_cpu(cpu) { | |
707 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 708 | void *va = (void *)addr; |
10fad5e4 | 709 | |
383776fa | 710 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 711 | if (can_addr) { |
383776fa | 712 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
713 | *can_addr += (unsigned long) |
714 | per_cpu_ptr(mod->percpu, | |
715 | get_boot_cpu_id()); | |
716 | } | |
10fad5e4 TH |
717 | preempt_enable(); |
718 | return true; | |
719 | } | |
720 | } | |
721 | } | |
722 | ||
723 | preempt_enable(); | |
724 | return false; | |
6b588c18 TH |
725 | } |
726 | ||
383776fa TG |
727 | /** |
728 | * is_module_percpu_address - test whether address is from module static percpu | |
729 | * @addr: address to test | |
730 | * | |
731 | * Test whether @addr belongs to module static percpu area. | |
732 | * | |
733 | * RETURNS: | |
734 | * %true if @addr is from module static percpu area | |
735 | */ | |
736 | bool is_module_percpu_address(unsigned long addr) | |
737 | { | |
738 | return __is_module_percpu_address(addr, NULL); | |
739 | } | |
740 | ||
1da177e4 | 741 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 742 | |
259354de | 743 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
744 | { |
745 | return NULL; | |
746 | } | |
9eb76d77 | 747 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 748 | { |
9eb76d77 RR |
749 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
750 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
751 | return -ENOMEM; | |
752 | return 0; | |
259354de TH |
753 | } |
754 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 755 | { |
1da177e4 | 756 | } |
49668688 | 757 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
758 | { |
759 | return 0; | |
760 | } | |
259354de TH |
761 | static inline void percpu_modcopy(struct module *mod, |
762 | const void *from, unsigned long size) | |
1da177e4 LT |
763 | { |
764 | /* pcpusec should be 0, and size of that section should be 0. */ | |
765 | BUG_ON(size != 0); | |
766 | } | |
10fad5e4 TH |
767 | bool is_module_percpu_address(unsigned long addr) |
768 | { | |
769 | return false; | |
770 | } | |
6b588c18 | 771 | |
383776fa TG |
772 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
773 | { | |
774 | return false; | |
775 | } | |
776 | ||
1da177e4 LT |
777 | #endif /* CONFIG_SMP */ |
778 | ||
c988d2b2 MD |
779 | #define MODINFO_ATTR(field) \ |
780 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
781 | { \ | |
782 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
783 | } \ | |
784 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 785 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 786 | { \ |
cc56ded3 | 787 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
788 | } \ |
789 | static int modinfo_##field##_exists(struct module *mod) \ | |
790 | { \ | |
791 | return mod->field != NULL; \ | |
792 | } \ | |
793 | static void free_modinfo_##field(struct module *mod) \ | |
794 | { \ | |
22a8bdeb DW |
795 | kfree(mod->field); \ |
796 | mod->field = NULL; \ | |
c988d2b2 MD |
797 | } \ |
798 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 799 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
800 | .show = show_modinfo_##field, \ |
801 | .setup = setup_modinfo_##field, \ | |
802 | .test = modinfo_##field##_exists, \ | |
803 | .free = free_modinfo_##field, \ | |
804 | }; | |
805 | ||
806 | MODINFO_ATTR(version); | |
807 | MODINFO_ATTR(srcversion); | |
808 | ||
e14af7ee AV |
809 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
810 | ||
03e88ae1 | 811 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
812 | |
813 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
814 | ||
e513cc1c MH |
815 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
816 | #define MODULE_REF_BASE 1 | |
817 | ||
1da177e4 | 818 | /* Init the unload section of the module. */ |
9f85a4bb | 819 | static int module_unload_init(struct module *mod) |
1da177e4 | 820 | { |
e513cc1c MH |
821 | /* |
822 | * Initialize reference counter to MODULE_REF_BASE. | |
823 | * refcnt == 0 means module is going. | |
824 | */ | |
825 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 826 | |
2c02dfe7 LT |
827 | INIT_LIST_HEAD(&mod->source_list); |
828 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 829 | |
1da177e4 | 830 | /* Hold reference count during initialization. */ |
e513cc1c | 831 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
832 | |
833 | return 0; | |
1da177e4 LT |
834 | } |
835 | ||
1da177e4 LT |
836 | /* Does a already use b? */ |
837 | static int already_uses(struct module *a, struct module *b) | |
838 | { | |
839 | struct module_use *use; | |
840 | ||
2c02dfe7 LT |
841 | list_for_each_entry(use, &b->source_list, source_list) { |
842 | if (use->source == a) { | |
5e124169 | 843 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
844 | return 1; |
845 | } | |
846 | } | |
5e124169 | 847 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
848 | return 0; |
849 | } | |
850 | ||
2c02dfe7 LT |
851 | /* |
852 | * Module a uses b | |
853 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
854 | * - the module_use is added to the list of 'b' sources (so | |
855 | * 'b' can walk the list to see who sourced them), and of 'a' | |
856 | * targets (so 'a' can see what modules it targets). | |
857 | */ | |
858 | static int add_module_usage(struct module *a, struct module *b) | |
859 | { | |
2c02dfe7 LT |
860 | struct module_use *use; |
861 | ||
5e124169 | 862 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 863 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 864 | if (!use) |
2c02dfe7 | 865 | return -ENOMEM; |
2c02dfe7 LT |
866 | |
867 | use->source = a; | |
868 | use->target = b; | |
869 | list_add(&use->source_list, &b->source_list); | |
870 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
871 | return 0; |
872 | } | |
873 | ||
75676500 | 874 | /* Module a uses b: caller needs module_mutex() */ |
7ef5264d | 875 | static int ref_module(struct module *a, struct module *b) |
1da177e4 | 876 | { |
c8e21ced | 877 | int err; |
270a6c4c | 878 | |
9bea7f23 | 879 | if (b == NULL || already_uses(a, b)) |
218ce735 | 880 | return 0; |
218ce735 | 881 | |
9bea7f23 RR |
882 | /* If module isn't available, we fail. */ |
883 | err = strong_try_module_get(b); | |
c9a3ba55 | 884 | if (err) |
9bea7f23 | 885 | return err; |
1da177e4 | 886 | |
2c02dfe7 LT |
887 | err = add_module_usage(a, b); |
888 | if (err) { | |
1da177e4 | 889 | module_put(b); |
9bea7f23 | 890 | return err; |
1da177e4 | 891 | } |
9bea7f23 | 892 | return 0; |
1da177e4 LT |
893 | } |
894 | ||
895 | /* Clear the unload stuff of the module. */ | |
896 | static void module_unload_free(struct module *mod) | |
897 | { | |
2c02dfe7 | 898 | struct module_use *use, *tmp; |
1da177e4 | 899 | |
75676500 | 900 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
901 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
902 | struct module *i = use->target; | |
5e124169 | 903 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
904 | module_put(i); |
905 | list_del(&use->source_list); | |
906 | list_del(&use->target_list); | |
907 | kfree(use); | |
1da177e4 | 908 | } |
75676500 | 909 | mutex_unlock(&module_mutex); |
1da177e4 LT |
910 | } |
911 | ||
912 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 913 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
914 | { |
915 | int ret = (flags & O_TRUNC); | |
916 | if (ret) | |
373d4d09 | 917 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
918 | return ret; |
919 | } | |
920 | #else | |
fb169793 | 921 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
922 | { |
923 | return 0; | |
924 | } | |
925 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
926 | ||
e513cc1c MH |
927 | /* Try to release refcount of module, 0 means success. */ |
928 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 929 | { |
e513cc1c | 930 | int ret; |
1da177e4 | 931 | |
e513cc1c MH |
932 | /* Try to decrement refcnt which we set at loading */ |
933 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
934 | BUG_ON(ret < 0); | |
935 | if (ret) | |
936 | /* Someone can put this right now, recover with checking */ | |
937 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 938 | |
e513cc1c MH |
939 | return ret; |
940 | } | |
1da177e4 | 941 | |
e513cc1c MH |
942 | static int try_stop_module(struct module *mod, int flags, int *forced) |
943 | { | |
da39ba5e | 944 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
945 | if (try_release_module_ref(mod) != 0) { |
946 | *forced = try_force_unload(flags); | |
947 | if (!(*forced)) | |
1da177e4 LT |
948 | return -EWOULDBLOCK; |
949 | } | |
950 | ||
951 | /* Mark it as dying. */ | |
e513cc1c | 952 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 953 | |
e513cc1c | 954 | return 0; |
1da177e4 LT |
955 | } |
956 | ||
d5db139a RR |
957 | /** |
958 | * module_refcount - return the refcount or -1 if unloading | |
959 | * | |
960 | * @mod: the module we're checking | |
961 | * | |
962 | * Returns: | |
963 | * -1 if the module is in the process of unloading | |
964 | * otherwise the number of references in the kernel to the module | |
965 | */ | |
966 | int module_refcount(struct module *mod) | |
1da177e4 | 967 | { |
d5db139a | 968 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
969 | } |
970 | EXPORT_SYMBOL(module_refcount); | |
971 | ||
972 | /* This exists whether we can unload or not */ | |
973 | static void free_module(struct module *mod); | |
974 | ||
17da2bd9 HC |
975 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
976 | unsigned int, flags) | |
1da177e4 LT |
977 | { |
978 | struct module *mod; | |
dfff0a06 | 979 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
980 | int ret, forced = 0; |
981 | ||
3d43321b | 982 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
983 | return -EPERM; |
984 | ||
985 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
986 | return -EFAULT; | |
987 | name[MODULE_NAME_LEN-1] = '\0'; | |
988 | ||
f6276ac9 RGB |
989 | audit_log_kern_module(name); |
990 | ||
3fc1f1e2 TH |
991 | if (mutex_lock_interruptible(&module_mutex) != 0) |
992 | return -EINTR; | |
1da177e4 LT |
993 | |
994 | mod = find_module(name); | |
995 | if (!mod) { | |
996 | ret = -ENOENT; | |
997 | goto out; | |
998 | } | |
999 | ||
2c02dfe7 | 1000 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
1001 | /* Other modules depend on us: get rid of them first. */ |
1002 | ret = -EWOULDBLOCK; | |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | /* Doing init or already dying? */ | |
1007 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 1008 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 1009 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
1010 | ret = -EBUSY; |
1011 | goto out; | |
1012 | } | |
1013 | ||
1014 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 1015 | if (mod->init && !mod->exit) { |
fb169793 | 1016 | forced = try_force_unload(flags); |
1da177e4 LT |
1017 | if (!forced) { |
1018 | /* This module can't be removed */ | |
1019 | ret = -EBUSY; | |
1020 | goto out; | |
1021 | } | |
1022 | } | |
1023 | ||
1da177e4 LT |
1024 | /* Stop the machine so refcounts can't move and disable module. */ |
1025 | ret = try_stop_module(mod, flags, &forced); | |
1026 | if (ret != 0) | |
1027 | goto out; | |
1028 | ||
df4b565e | 1029 | mutex_unlock(&module_mutex); |
25985edc | 1030 | /* Final destruction now no one is using it. */ |
df4b565e | 1031 | if (mod->exit != NULL) |
1da177e4 | 1032 | mod->exit(); |
df4b565e PO |
1033 | blocking_notifier_call_chain(&module_notify_list, |
1034 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1035 | klp_module_going(mod); |
7dcd182b JY |
1036 | ftrace_release_mod(mod); |
1037 | ||
22a9d645 | 1038 | async_synchronize_full(); |
75676500 | 1039 | |
e14af7ee | 1040 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1041 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1042 | |
75676500 | 1043 | free_module(mod); |
5d603311 KK |
1044 | /* someone could wait for the module in add_unformed_module() */ |
1045 | wake_up_all(&module_wq); | |
75676500 RR |
1046 | return 0; |
1047 | out: | |
6389a385 | 1048 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1049 | return ret; |
1050 | } | |
1051 | ||
d1e99d7a | 1052 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1053 | { |
1054 | struct module_use *use; | |
1055 | int printed_something = 0; | |
1056 | ||
d5db139a | 1057 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1058 | |
6da0b565 IA |
1059 | /* |
1060 | * Always include a trailing , so userspace can differentiate | |
1061 | * between this and the old multi-field proc format. | |
1062 | */ | |
2c02dfe7 | 1063 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1064 | printed_something = 1; |
2c02dfe7 | 1065 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1066 | } |
1067 | ||
1da177e4 LT |
1068 | if (mod->init != NULL && mod->exit == NULL) { |
1069 | printed_something = 1; | |
6da0b565 | 1070 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1071 | } |
1072 | ||
1073 | if (!printed_something) | |
6da0b565 | 1074 | seq_puts(m, "-"); |
1da177e4 LT |
1075 | } |
1076 | ||
1077 | void __symbol_put(const char *symbol) | |
1078 | { | |
1079 | struct module *owner; | |
1da177e4 | 1080 | |
24da1cbf | 1081 | preempt_disable(); |
ef1dac60 | 1082 | if (!find_symbol(symbol, &owner, NULL, NULL, true, false)) |
1da177e4 LT |
1083 | BUG(); |
1084 | module_put(owner); | |
24da1cbf | 1085 | preempt_enable(); |
1da177e4 LT |
1086 | } |
1087 | EXPORT_SYMBOL(__symbol_put); | |
1088 | ||
7d1d16e4 | 1089 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1090 | void symbol_put_addr(void *addr) |
1091 | { | |
5e376613 | 1092 | struct module *modaddr; |
7d1d16e4 | 1093 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1094 | |
7d1d16e4 | 1095 | if (core_kernel_text(a)) |
5e376613 | 1096 | return; |
1da177e4 | 1097 | |
275d7d44 PZ |
1098 | /* |
1099 | * Even though we hold a reference on the module; we still need to | |
1100 | * disable preemption in order to safely traverse the data structure. | |
1101 | */ | |
1102 | preempt_disable(); | |
7d1d16e4 | 1103 | modaddr = __module_text_address(a); |
a6e6abd5 | 1104 | BUG_ON(!modaddr); |
5e376613 | 1105 | module_put(modaddr); |
275d7d44 | 1106 | preempt_enable(); |
1da177e4 LT |
1107 | } |
1108 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1109 | ||
1110 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1111 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1112 | { |
d5db139a | 1113 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1114 | } |
1115 | ||
cca3e707 KS |
1116 | static struct module_attribute modinfo_refcnt = |
1117 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1118 | |
d53799be SR |
1119 | void __module_get(struct module *module) |
1120 | { | |
1121 | if (module) { | |
1122 | preempt_disable(); | |
2f35c41f | 1123 | atomic_inc(&module->refcnt); |
d53799be SR |
1124 | trace_module_get(module, _RET_IP_); |
1125 | preempt_enable(); | |
1126 | } | |
1127 | } | |
1128 | EXPORT_SYMBOL(__module_get); | |
1129 | ||
1130 | bool try_module_get(struct module *module) | |
1131 | { | |
1132 | bool ret = true; | |
1133 | ||
1134 | if (module) { | |
1135 | preempt_disable(); | |
e513cc1c MH |
1136 | /* Note: here, we can fail to get a reference */ |
1137 | if (likely(module_is_live(module) && | |
1138 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1139 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1140 | else |
d53799be SR |
1141 | ret = false; |
1142 | ||
1143 | preempt_enable(); | |
1144 | } | |
1145 | return ret; | |
1146 | } | |
1147 | EXPORT_SYMBOL(try_module_get); | |
1148 | ||
f6a57033 AV |
1149 | void module_put(struct module *module) |
1150 | { | |
e513cc1c MH |
1151 | int ret; |
1152 | ||
f6a57033 | 1153 | if (module) { |
e1783a24 | 1154 | preempt_disable(); |
e513cc1c MH |
1155 | ret = atomic_dec_if_positive(&module->refcnt); |
1156 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1157 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1158 | preempt_enable(); |
f6a57033 AV |
1159 | } |
1160 | } | |
1161 | EXPORT_SYMBOL(module_put); | |
1162 | ||
1da177e4 | 1163 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1164 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1165 | { |
1166 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1167 | seq_puts(m, " - -"); |
1da177e4 LT |
1168 | } |
1169 | ||
1170 | static inline void module_unload_free(struct module *mod) | |
1171 | { | |
1172 | } | |
1173 | ||
7ef5264d | 1174 | static int ref_module(struct module *a, struct module *b) |
1da177e4 | 1175 | { |
9bea7f23 | 1176 | return strong_try_module_get(b); |
1da177e4 LT |
1177 | } |
1178 | ||
9f85a4bb | 1179 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1180 | { |
9f85a4bb | 1181 | return 0; |
1da177e4 LT |
1182 | } |
1183 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1184 | ||
53999bf3 KW |
1185 | static size_t module_flags_taint(struct module *mod, char *buf) |
1186 | { | |
1187 | size_t l = 0; | |
7fd8329b PM |
1188 | int i; |
1189 | ||
1190 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1191 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1192 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1193 | } |
53999bf3 | 1194 | |
53999bf3 KW |
1195 | return l; |
1196 | } | |
1197 | ||
1f71740a | 1198 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1199 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1200 | { |
1201 | const char *state = "unknown"; | |
1202 | ||
4befb026 | 1203 | switch (mk->mod->state) { |
1f71740a KS |
1204 | case MODULE_STATE_LIVE: |
1205 | state = "live"; | |
1206 | break; | |
1207 | case MODULE_STATE_COMING: | |
1208 | state = "coming"; | |
1209 | break; | |
1210 | case MODULE_STATE_GOING: | |
1211 | state = "going"; | |
1212 | break; | |
0d21b0e3 RR |
1213 | default: |
1214 | BUG(); | |
1f71740a KS |
1215 | } |
1216 | return sprintf(buffer, "%s\n", state); | |
1217 | } | |
1218 | ||
cca3e707 KS |
1219 | static struct module_attribute modinfo_initstate = |
1220 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1221 | |
88bfa324 KS |
1222 | static ssize_t store_uevent(struct module_attribute *mattr, |
1223 | struct module_kobject *mk, | |
1224 | const char *buffer, size_t count) | |
1225 | { | |
df44b479 PR |
1226 | int rc; |
1227 | ||
1228 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1229 | return rc ? rc : count; | |
88bfa324 KS |
1230 | } |
1231 | ||
cca3e707 KS |
1232 | struct module_attribute module_uevent = |
1233 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1234 | ||
1235 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1236 | struct module_kobject *mk, char *buffer) | |
1237 | { | |
7523e4dc | 1238 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1239 | } |
1240 | ||
1241 | static struct module_attribute modinfo_coresize = | |
1242 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1243 | ||
1244 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1245 | struct module_kobject *mk, char *buffer) | |
1246 | { | |
7523e4dc | 1247 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1248 | } |
1249 | ||
1250 | static struct module_attribute modinfo_initsize = | |
1251 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1252 | ||
1253 | static ssize_t show_taint(struct module_attribute *mattr, | |
1254 | struct module_kobject *mk, char *buffer) | |
1255 | { | |
1256 | size_t l; | |
1257 | ||
1258 | l = module_flags_taint(mk->mod, buffer); | |
1259 | buffer[l++] = '\n'; | |
1260 | return l; | |
1261 | } | |
1262 | ||
1263 | static struct module_attribute modinfo_taint = | |
1264 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1265 | |
03e88ae1 | 1266 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1267 | &module_uevent, |
03e88ae1 GKH |
1268 | &modinfo_version, |
1269 | &modinfo_srcversion, | |
cca3e707 KS |
1270 | &modinfo_initstate, |
1271 | &modinfo_coresize, | |
1272 | &modinfo_initsize, | |
1273 | &modinfo_taint, | |
03e88ae1 | 1274 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1275 | &modinfo_refcnt, |
03e88ae1 GKH |
1276 | #endif |
1277 | NULL, | |
1278 | }; | |
1279 | ||
1da177e4 LT |
1280 | static const char vermagic[] = VERMAGIC_STRING; |
1281 | ||
c6e665c8 | 1282 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1283 | { |
1284 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1285 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1286 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1287 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1288 | return 0; |
1289 | #else | |
1290 | return -ENOEXEC; | |
1291 | #endif | |
1292 | } | |
1293 | ||
1da177e4 | 1294 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1295 | |
1296 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1297 | { |
71810db2 | 1298 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1299 | } |
1300 | ||
49019426 | 1301 | static int check_version(const struct load_info *info, |
1da177e4 | 1302 | const char *symname, |
6da0b565 | 1303 | struct module *mod, |
71810db2 | 1304 | const s32 *crc) |
1da177e4 | 1305 | { |
49019426 KC |
1306 | Elf_Shdr *sechdrs = info->sechdrs; |
1307 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1308 | unsigned int i, num_versions; |
1309 | struct modversion_info *versions; | |
1310 | ||
1311 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1312 | if (!crc) | |
1313 | return 1; | |
1314 | ||
a5dd6970 RR |
1315 | /* No versions at all? modprobe --force does this. */ |
1316 | if (versindex == 0) | |
1317 | return try_to_force_load(mod, symname) == 0; | |
1318 | ||
1da177e4 LT |
1319 | versions = (void *) sechdrs[versindex].sh_addr; |
1320 | num_versions = sechdrs[versindex].sh_size | |
1321 | / sizeof(struct modversion_info); | |
1322 | ||
1323 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1324 | u32 crcval; |
1325 | ||
1da177e4 LT |
1326 | if (strcmp(versions[i].name, symname) != 0) |
1327 | continue; | |
1328 | ||
71810db2 AB |
1329 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1330 | crcval = resolve_rel_crc(crc); | |
1331 | else | |
1332 | crcval = *crc; | |
1333 | if (versions[i].crc == crcval) | |
1da177e4 | 1334 | return 1; |
71810db2 AB |
1335 | pr_debug("Found checksum %X vs module %lX\n", |
1336 | crcval, versions[i].crc); | |
826e4506 | 1337 | goto bad_version; |
1da177e4 | 1338 | } |
826e4506 | 1339 | |
faaae2a5 | 1340 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1341 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1342 | return 1; |
826e4506 LT |
1343 | |
1344 | bad_version: | |
6da0b565 | 1345 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1346 | info->name, symname); |
826e4506 | 1347 | return 0; |
1da177e4 LT |
1348 | } |
1349 | ||
49019426 | 1350 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1351 | struct module *mod) |
1352 | { | |
71810db2 | 1353 | const s32 *crc; |
1da177e4 | 1354 | |
926a59b1 PZ |
1355 | /* |
1356 | * Since this should be found in kernel (which can't be removed), no | |
1357 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1358 | */ | |
1359 | preempt_disable(); | |
ef1dac60 | 1360 | if (!find_symbol("module_layout", NULL, &crc, NULL, true, false)) { |
926a59b1 | 1361 | preempt_enable(); |
1da177e4 | 1362 | BUG(); |
926a59b1 PZ |
1363 | } |
1364 | preempt_enable(); | |
996302c5 | 1365 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1366 | } |
1367 | ||
91e37a79 RR |
1368 | /* First part is kernel version, which we ignore if module has crcs. */ |
1369 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1370 | bool has_crcs) | |
1da177e4 | 1371 | { |
91e37a79 RR |
1372 | if (has_crcs) { |
1373 | amagic += strcspn(amagic, " "); | |
1374 | bmagic += strcspn(bmagic, " "); | |
1375 | } | |
1da177e4 LT |
1376 | return strcmp(amagic, bmagic) == 0; |
1377 | } | |
1378 | #else | |
49019426 | 1379 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1380 | const char *symname, |
6da0b565 | 1381 | struct module *mod, |
71810db2 | 1382 | const s32 *crc) |
1da177e4 LT |
1383 | { |
1384 | return 1; | |
1385 | } | |
1386 | ||
49019426 | 1387 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1388 | struct module *mod) |
1389 | { | |
1390 | return 1; | |
1391 | } | |
1392 | ||
91e37a79 RR |
1393 | static inline int same_magic(const char *amagic, const char *bmagic, |
1394 | bool has_crcs) | |
1da177e4 LT |
1395 | { |
1396 | return strcmp(amagic, bmagic) == 0; | |
1397 | } | |
1398 | #endif /* CONFIG_MODVERSIONS */ | |
1399 | ||
8651ec01 MM |
1400 | static char *get_modinfo(const struct load_info *info, const char *tag); |
1401 | static char *get_next_modinfo(const struct load_info *info, const char *tag, | |
1402 | char *prev); | |
1403 | ||
1404 | static int verify_namespace_is_imported(const struct load_info *info, | |
1405 | const struct kernel_symbol *sym, | |
1406 | struct module *mod) | |
1407 | { | |
1408 | const char *namespace; | |
1409 | char *imported_namespace; | |
1410 | ||
1411 | namespace = kernel_symbol_namespace(sym); | |
c3a6cf19 | 1412 | if (namespace && namespace[0]) { |
8651ec01 MM |
1413 | imported_namespace = get_modinfo(info, "import_ns"); |
1414 | while (imported_namespace) { | |
1415 | if (strcmp(namespace, imported_namespace) == 0) | |
1416 | return 0; | |
1417 | imported_namespace = get_next_modinfo( | |
1418 | info, "import_ns", imported_namespace); | |
1419 | } | |
3d52ec5e MM |
1420 | #ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
1421 | pr_warn( | |
1422 | #else | |
1423 | pr_err( | |
1424 | #endif | |
1425 | "%s: module uses symbol (%s) from namespace %s, but does not import it.\n", | |
1426 | mod->name, kernel_symbol_name(sym), namespace); | |
1427 | #ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS | |
8651ec01 | 1428 | return -EINVAL; |
3d52ec5e | 1429 | #endif |
8651ec01 MM |
1430 | } |
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | ||
75676500 | 1435 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1436 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1437 | const struct load_info *info, | |
414fd31b | 1438 | const char *name, |
9bea7f23 | 1439 | char ownername[]) |
1da177e4 LT |
1440 | { |
1441 | struct module *owner; | |
414fd31b | 1442 | const struct kernel_symbol *sym; |
71810db2 | 1443 | const s32 *crc; |
ef1dac60 | 1444 | enum mod_license license; |
9bea7f23 | 1445 | int err; |
1da177e4 | 1446 | |
d64810f5 PZ |
1447 | /* |
1448 | * The module_mutex should not be a heavily contended lock; | |
1449 | * if we get the occasional sleep here, we'll go an extra iteration | |
1450 | * in the wait_event_interruptible(), which is harmless. | |
1451 | */ | |
1452 | sched_annotate_sleep(); | |
75676500 | 1453 | mutex_lock(&module_mutex); |
ef1dac60 | 1454 | sym = find_symbol(name, &owner, &crc, &license, |
25ddbb18 | 1455 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1456 | if (!sym) |
1457 | goto unlock; | |
1458 | ||
49019426 | 1459 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1460 | sym = ERR_PTR(-EINVAL); |
1461 | goto getname; | |
1da177e4 | 1462 | } |
9bea7f23 | 1463 | |
8651ec01 MM |
1464 | err = verify_namespace_is_imported(info, sym, mod); |
1465 | if (err) { | |
1466 | sym = ERR_PTR(err); | |
1467 | goto getname; | |
1468 | } | |
1469 | ||
9bea7f23 RR |
1470 | err = ref_module(mod, owner); |
1471 | if (err) { | |
1472 | sym = ERR_PTR(err); | |
1473 | goto getname; | |
1474 | } | |
1475 | ||
1476 | getname: | |
1477 | /* We must make copy under the lock if we failed to get ref. */ | |
1478 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1479 | unlock: | |
75676500 | 1480 | mutex_unlock(&module_mutex); |
218ce735 | 1481 | return sym; |
1da177e4 LT |
1482 | } |
1483 | ||
49668688 RR |
1484 | static const struct kernel_symbol * |
1485 | resolve_symbol_wait(struct module *mod, | |
1486 | const struct load_info *info, | |
1487 | const char *name) | |
9bea7f23 RR |
1488 | { |
1489 | const struct kernel_symbol *ksym; | |
49668688 | 1490 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1491 | |
1492 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1493 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1494 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1495 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1496 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1497 | mod->name, owner); | |
9bea7f23 RR |
1498 | } |
1499 | return ksym; | |
1500 | } | |
1501 | ||
1da177e4 LT |
1502 | /* |
1503 | * /sys/module/foo/sections stuff | |
1504 | * J. Corbet <corbet@lwn.net> | |
1505 | */ | |
8f6d0378 | 1506 | #ifdef CONFIG_SYSFS |
10b465aa | 1507 | |
8f6d0378 | 1508 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1509 | static inline bool sect_empty(const Elf_Shdr *sect) |
1510 | { | |
1511 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1512 | } | |
1513 | ||
6da0b565 | 1514 | struct module_sect_attr { |
a58730c4 RR |
1515 | struct module_attribute mattr; |
1516 | char *name; | |
1517 | unsigned long address; | |
1518 | }; | |
1519 | ||
6da0b565 | 1520 | struct module_sect_attrs { |
a58730c4 RR |
1521 | struct attribute_group grp; |
1522 | unsigned int nsections; | |
0f742266 | 1523 | struct module_sect_attr attrs[]; |
a58730c4 RR |
1524 | }; |
1525 | ||
1da177e4 | 1526 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1527 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1528 | { |
1529 | struct module_sect_attr *sattr = | |
1530 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1531 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1532 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1533 | } |
1534 | ||
04b1db9f IN |
1535 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1536 | { | |
a58730c4 | 1537 | unsigned int section; |
04b1db9f IN |
1538 | |
1539 | for (section = 0; section < sect_attrs->nsections; section++) | |
1540 | kfree(sect_attrs->attrs[section].name); | |
1541 | kfree(sect_attrs); | |
1542 | } | |
1543 | ||
8f6d0378 | 1544 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1545 | { |
1546 | unsigned int nloaded = 0, i, size[2]; | |
1547 | struct module_sect_attrs *sect_attrs; | |
1548 | struct module_sect_attr *sattr; | |
1549 | struct attribute **gattr; | |
22a8bdeb | 1550 | |
1da177e4 | 1551 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1552 | for (i = 0; i < info->hdr->e_shnum; i++) |
1553 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 | 1554 | nloaded++; |
8d1b73dd | 1555 | size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
1da177e4 LT |
1556 | sizeof(sect_attrs->grp.attrs[0])); |
1557 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1558 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1559 | if (sect_attrs == NULL) | |
1da177e4 LT |
1560 | return; |
1561 | ||
1562 | /* Setup section attributes. */ | |
1563 | sect_attrs->grp.name = "sections"; | |
1564 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1565 | ||
04b1db9f | 1566 | sect_attrs->nsections = 0; |
1da177e4 LT |
1567 | sattr = §_attrs->attrs[0]; |
1568 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1569 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1570 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1571 | if (sect_empty(sec)) | |
35dead42 | 1572 | continue; |
8f6d0378 RR |
1573 | sattr->address = sec->sh_addr; |
1574 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1575 | GFP_KERNEL); |
1576 | if (sattr->name == NULL) | |
1577 | goto out; | |
1578 | sect_attrs->nsections++; | |
361795b1 | 1579 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1580 | sattr->mattr.show = module_sect_show; |
1581 | sattr->mattr.store = NULL; | |
1582 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1583 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1584 | *(gattr++) = &(sattr++)->mattr.attr; |
1585 | } | |
1586 | *gattr = NULL; | |
1587 | ||
1588 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1589 | goto out; | |
1590 | ||
1591 | mod->sect_attrs = sect_attrs; | |
1592 | return; | |
1593 | out: | |
04b1db9f | 1594 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1595 | } |
1596 | ||
1597 | static void remove_sect_attrs(struct module *mod) | |
1598 | { | |
1599 | if (mod->sect_attrs) { | |
1600 | sysfs_remove_group(&mod->mkobj.kobj, | |
1601 | &mod->sect_attrs->grp); | |
1602 | /* We are positive that no one is using any sect attrs | |
1603 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1604 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1605 | mod->sect_attrs = NULL; |
1606 | } | |
1607 | } | |
1608 | ||
6d760133 RM |
1609 | /* |
1610 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1611 | */ | |
1612 | ||
1613 | struct module_notes_attrs { | |
1614 | struct kobject *dir; | |
1615 | unsigned int notes; | |
0f742266 | 1616 | struct bin_attribute attrs[]; |
6d760133 RM |
1617 | }; |
1618 | ||
2c3c8bea | 1619 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1620 | struct bin_attribute *bin_attr, |
1621 | char *buf, loff_t pos, size_t count) | |
1622 | { | |
1623 | /* | |
1624 | * The caller checked the pos and count against our size. | |
1625 | */ | |
1626 | memcpy(buf, bin_attr->private + pos, count); | |
1627 | return count; | |
1628 | } | |
1629 | ||
1630 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1631 | unsigned int i) | |
1632 | { | |
1633 | if (notes_attrs->dir) { | |
1634 | while (i-- > 0) | |
1635 | sysfs_remove_bin_file(notes_attrs->dir, | |
1636 | ¬es_attrs->attrs[i]); | |
e9432093 | 1637 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1638 | } |
1639 | kfree(notes_attrs); | |
1640 | } | |
1641 | ||
8f6d0378 | 1642 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1643 | { |
1644 | unsigned int notes, loaded, i; | |
1645 | struct module_notes_attrs *notes_attrs; | |
1646 | struct bin_attribute *nattr; | |
1647 | ||
ea6bff36 IM |
1648 | /* failed to create section attributes, so can't create notes */ |
1649 | if (!mod->sect_attrs) | |
1650 | return; | |
1651 | ||
6d760133 RM |
1652 | /* Count notes sections and allocate structures. */ |
1653 | notes = 0; | |
8f6d0378 RR |
1654 | for (i = 0; i < info->hdr->e_shnum; i++) |
1655 | if (!sect_empty(&info->sechdrs[i]) && | |
1656 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1657 | ++notes; |
1658 | ||
1659 | if (notes == 0) | |
1660 | return; | |
1661 | ||
acafe7e3 | 1662 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1663 | GFP_KERNEL); |
1664 | if (notes_attrs == NULL) | |
1665 | return; | |
1666 | ||
1667 | notes_attrs->notes = notes; | |
1668 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1669 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1670 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1671 | continue; |
8f6d0378 | 1672 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1673 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1674 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1675 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1676 | nattr->size = info->sechdrs[i].sh_size; |
1677 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1678 | nattr->read = module_notes_read; |
1679 | ++nattr; | |
1680 | } | |
1681 | ++loaded; | |
1682 | } | |
1683 | ||
4ff6abff | 1684 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1685 | if (!notes_attrs->dir) |
1686 | goto out; | |
1687 | ||
1688 | for (i = 0; i < notes; ++i) | |
1689 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1690 | ¬es_attrs->attrs[i])) | |
1691 | goto out; | |
1692 | ||
1693 | mod->notes_attrs = notes_attrs; | |
1694 | return; | |
1695 | ||
1696 | out: | |
1697 | free_notes_attrs(notes_attrs, i); | |
1698 | } | |
1699 | ||
1700 | static void remove_notes_attrs(struct module *mod) | |
1701 | { | |
1702 | if (mod->notes_attrs) | |
1703 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1704 | } | |
1705 | ||
1da177e4 | 1706 | #else |
04b1db9f | 1707 | |
8f6d0378 RR |
1708 | static inline void add_sect_attrs(struct module *mod, |
1709 | const struct load_info *info) | |
1da177e4 LT |
1710 | { |
1711 | } | |
1712 | ||
1713 | static inline void remove_sect_attrs(struct module *mod) | |
1714 | { | |
1715 | } | |
6d760133 | 1716 | |
8f6d0378 RR |
1717 | static inline void add_notes_attrs(struct module *mod, |
1718 | const struct load_info *info) | |
6d760133 RM |
1719 | { |
1720 | } | |
1721 | ||
1722 | static inline void remove_notes_attrs(struct module *mod) | |
1723 | { | |
1724 | } | |
8f6d0378 | 1725 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1726 | |
1ba5c08b | 1727 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1728 | { |
1729 | #ifdef CONFIG_MODULE_UNLOAD | |
1730 | struct module_use *use; | |
80a3d1bb | 1731 | |
75676500 | 1732 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1733 | list_for_each_entry(use, &mod->target_list, target_list) |
1734 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1735 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1736 | #endif |
1737 | } | |
1738 | ||
1ba5c08b | 1739 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1740 | { |
1ba5c08b | 1741 | int ret = 0; |
80a3d1bb RR |
1742 | #ifdef CONFIG_MODULE_UNLOAD |
1743 | struct module_use *use; | |
1744 | ||
75676500 | 1745 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1746 | list_for_each_entry(use, &mod->target_list, target_list) { |
1747 | ret = sysfs_create_link(use->target->holders_dir, | |
1748 | &mod->mkobj.kobj, mod->name); | |
1749 | if (ret) | |
1750 | break; | |
1751 | } | |
75676500 | 1752 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1753 | if (ret) |
1754 | del_usage_links(mod); | |
80a3d1bb | 1755 | #endif |
1ba5c08b | 1756 | return ret; |
80a3d1bb RR |
1757 | } |
1758 | ||
bc6f2a75 Y |
1759 | static void module_remove_modinfo_attrs(struct module *mod, int end); |
1760 | ||
6407ebb2 | 1761 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1762 | { |
1763 | struct module_attribute *attr; | |
03e88ae1 | 1764 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1765 | int error = 0; |
1766 | int i; | |
1767 | ||
03e88ae1 GKH |
1768 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1769 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1770 | GFP_KERNEL); | |
1771 | if (!mod->modinfo_attrs) | |
1772 | return -ENOMEM; | |
1773 | ||
1774 | temp_attr = mod->modinfo_attrs; | |
bc6f2a75 | 1775 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
c75b590d | 1776 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1777 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1778 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1779 | error = sysfs_create_file(&mod->mkobj.kobj, |
1780 | &temp_attr->attr); | |
bc6f2a75 Y |
1781 | if (error) |
1782 | goto error_out; | |
03e88ae1 GKH |
1783 | ++temp_attr; |
1784 | } | |
c988d2b2 | 1785 | } |
bc6f2a75 Y |
1786 | |
1787 | return 0; | |
1788 | ||
1789 | error_out: | |
1790 | if (i > 0) | |
1791 | module_remove_modinfo_attrs(mod, --i); | |
f6d061d6 Y |
1792 | else |
1793 | kfree(mod->modinfo_attrs); | |
c988d2b2 MD |
1794 | return error; |
1795 | } | |
1796 | ||
bc6f2a75 | 1797 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
c988d2b2 MD |
1798 | { |
1799 | struct module_attribute *attr; | |
1800 | int i; | |
1801 | ||
03e88ae1 | 1802 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
bc6f2a75 Y |
1803 | if (end >= 0 && i > end) |
1804 | break; | |
03e88ae1 GKH |
1805 | /* pick a field to test for end of list */ |
1806 | if (!attr->attr.name) | |
1807 | break; | |
6da0b565 | 1808 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1809 | if (attr->free) |
1810 | attr->free(mod); | |
c988d2b2 | 1811 | } |
03e88ae1 | 1812 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1813 | } |
1da177e4 | 1814 | |
942e4431 LZ |
1815 | static void mod_kobject_put(struct module *mod) |
1816 | { | |
1817 | DECLARE_COMPLETION_ONSTACK(c); | |
1818 | mod->mkobj.kobj_completion = &c; | |
1819 | kobject_put(&mod->mkobj.kobj); | |
1820 | wait_for_completion(&c); | |
1821 | } | |
1822 | ||
6407ebb2 | 1823 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1824 | { |
1825 | int err; | |
6494a93d | 1826 | struct kobject *kobj; |
1da177e4 | 1827 | |
823bccfc | 1828 | if (!module_sysfs_initialized) { |
bddb12b3 | 1829 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1830 | err = -EINVAL; |
1831 | goto out; | |
1832 | } | |
6494a93d GKH |
1833 | |
1834 | kobj = kset_find_obj(module_kset, mod->name); | |
1835 | if (kobj) { | |
bddb12b3 | 1836 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1837 | kobject_put(kobj); |
1838 | err = -EINVAL; | |
1839 | goto out; | |
1840 | } | |
1841 | ||
1da177e4 | 1842 | mod->mkobj.mod = mod; |
e17e0f51 | 1843 | |
ac3c8141 GKH |
1844 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1845 | mod->mkobj.kobj.kset = module_kset; | |
1846 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1847 | "%s", mod->name); | |
1848 | if (err) | |
942e4431 | 1849 | mod_kobject_put(mod); |
270a6c4c | 1850 | |
97c146ef | 1851 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1852 | out: |
1853 | return err; | |
1854 | } | |
1855 | ||
6407ebb2 | 1856 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1857 | const struct load_info *info, |
270a6c4c KS |
1858 | struct kernel_param *kparam, |
1859 | unsigned int num_params) | |
1860 | { | |
1861 | int err; | |
1862 | ||
80a3d1bb RR |
1863 | err = mod_sysfs_init(mod); |
1864 | if (err) | |
1865 | goto out; | |
1866 | ||
4ff6abff | 1867 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1868 | if (!mod->holders_dir) { |
1869 | err = -ENOMEM; | |
270a6c4c | 1870 | goto out_unreg; |
240936e1 | 1871 | } |
270a6c4c | 1872 | |
1da177e4 LT |
1873 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1874 | if (err) | |
270a6c4c | 1875 | goto out_unreg_holders; |
1da177e4 | 1876 | |
c988d2b2 MD |
1877 | err = module_add_modinfo_attrs(mod); |
1878 | if (err) | |
e17e0f51 | 1879 | goto out_unreg_param; |
c988d2b2 | 1880 | |
1ba5c08b CL |
1881 | err = add_usage_links(mod); |
1882 | if (err) | |
1883 | goto out_unreg_modinfo_attrs; | |
1884 | ||
8f6d0378 RR |
1885 | add_sect_attrs(mod, info); |
1886 | add_notes_attrs(mod, info); | |
80a3d1bb | 1887 | |
e17e0f51 | 1888 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1889 | return 0; |
1890 | ||
1ba5c08b | 1891 | out_unreg_modinfo_attrs: |
bc6f2a75 | 1892 | module_remove_modinfo_attrs(mod, -1); |
e17e0f51 KS |
1893 | out_unreg_param: |
1894 | module_param_sysfs_remove(mod); | |
270a6c4c | 1895 | out_unreg_holders: |
78a2d906 | 1896 | kobject_put(mod->holders_dir); |
270a6c4c | 1897 | out_unreg: |
942e4431 | 1898 | mod_kobject_put(mod); |
80a3d1bb | 1899 | out: |
1da177e4 LT |
1900 | return err; |
1901 | } | |
34e4e2fe DL |
1902 | |
1903 | static void mod_sysfs_fini(struct module *mod) | |
1904 | { | |
8f6d0378 RR |
1905 | remove_notes_attrs(mod); |
1906 | remove_sect_attrs(mod); | |
942e4431 | 1907 | mod_kobject_put(mod); |
34e4e2fe DL |
1908 | } |
1909 | ||
cf2fde7b RR |
1910 | static void init_param_lock(struct module *mod) |
1911 | { | |
1912 | mutex_init(&mod->param_lock); | |
1913 | } | |
8f6d0378 | 1914 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1915 | |
8f6d0378 RR |
1916 | static int mod_sysfs_setup(struct module *mod, |
1917 | const struct load_info *info, | |
6407ebb2 RR |
1918 | struct kernel_param *kparam, |
1919 | unsigned int num_params) | |
1920 | { | |
1921 | return 0; | |
1922 | } | |
1923 | ||
34e4e2fe DL |
1924 | static void mod_sysfs_fini(struct module *mod) |
1925 | { | |
1926 | } | |
1927 | ||
bc6f2a75 | 1928 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
36b0360d RR |
1929 | { |
1930 | } | |
1931 | ||
80a3d1bb RR |
1932 | static void del_usage_links(struct module *mod) |
1933 | { | |
1934 | } | |
1935 | ||
cf2fde7b RR |
1936 | static void init_param_lock(struct module *mod) |
1937 | { | |
1938 | } | |
34e4e2fe | 1939 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1940 | |
36b0360d | 1941 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1942 | { |
80a3d1bb | 1943 | del_usage_links(mod); |
bc6f2a75 | 1944 | module_remove_modinfo_attrs(mod, -1); |
1da177e4 | 1945 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1946 | kobject_put(mod->mkobj.drivers_dir); |
1947 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1948 | mod_sysfs_fini(mod); |
1da177e4 LT |
1949 | } |
1950 | ||
84e1c6bb MC |
1951 | /* |
1952 | * LKM RO/NX protection: protect module's text/ro-data | |
1953 | * from modification and any data from execution. | |
85c898db RR |
1954 | * |
1955 | * General layout of module is: | |
444d13ff JY |
1956 | * [text] [read-only-data] [ro-after-init] [writable data] |
1957 | * text_size -----^ ^ ^ ^ | |
1958 | * ro_size ------------------------| | | | |
1959 | * ro_after_init_size -----------------------------| | | |
1960 | * size -----------------------------------------------------------| | |
85c898db RR |
1961 | * |
1962 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1963 | */ |
db991af0 JY |
1964 | |
1965 | /* | |
1966 | * Since some arches are moving towards PAGE_KERNEL module allocations instead | |
1967 | * of PAGE_KERNEL_EXEC, keep frob_text() and module_enable_x() outside of the | |
1968 | * CONFIG_STRICT_MODULE_RWX block below because they are needed regardless of | |
1969 | * whether we are strict. | |
1970 | */ | |
1971 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX | |
85c898db RR |
1972 | static void frob_text(const struct module_layout *layout, |
1973 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1974 | { |
85c898db RR |
1975 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1976 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1977 | set_memory((unsigned long)layout->base, | |
1978 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1979 | } |
84e1c6bb | 1980 | |
db991af0 JY |
1981 | static void module_enable_x(const struct module *mod) |
1982 | { | |
1983 | frob_text(&mod->core_layout, set_memory_x); | |
1984 | frob_text(&mod->init_layout, set_memory_x); | |
1985 | } | |
1986 | #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
1987 | static void module_enable_x(const struct module *mod) { } | |
1988 | #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
1989 | ||
93651f80 | 1990 | #ifdef CONFIG_STRICT_MODULE_RWX |
85c898db RR |
1991 | static void frob_rodata(const struct module_layout *layout, |
1992 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1993 | { |
85c898db RR |
1994 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1995 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1996 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1997 | set_memory((unsigned long)layout->base + layout->text_size, | |
1998 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1999 | } |
2000 | ||
444d13ff JY |
2001 | static void frob_ro_after_init(const struct module_layout *layout, |
2002 | int (*set_memory)(unsigned long start, int num_pages)) | |
2003 | { | |
2004 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
2005 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
2006 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
2007 | set_memory((unsigned long)layout->base + layout->ro_size, | |
2008 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
2009 | } | |
2010 | ||
85c898db RR |
2011 | static void frob_writable_data(const struct module_layout *layout, |
2012 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 2013 | { |
85c898db | 2014 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 2015 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 2016 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
2017 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
2018 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 2019 | } |
84e1c6bb | 2020 | |
e6eff437 | 2021 | static void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 2022 | { |
39290b38 AT |
2023 | if (!rodata_enabled) |
2024 | return; | |
2025 | ||
1a7b7d92 RE |
2026 | set_vm_flush_reset_perms(mod->core_layout.base); |
2027 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 2028 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 2029 | |
85c898db RR |
2030 | frob_rodata(&mod->core_layout, set_memory_ro); |
2031 | frob_text(&mod->init_layout, set_memory_ro); | |
2032 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
2033 | |
2034 | if (after_init) | |
2035 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
2036 | } |
2037 | ||
85c898db | 2038 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 2039 | { |
85c898db | 2040 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 2041 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
2042 | frob_writable_data(&mod->core_layout, set_memory_nx); |
2043 | frob_rodata(&mod->init_layout, set_memory_nx); | |
2044 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
2045 | } |
2046 | ||
5c3a7db0 PZ |
2047 | static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, |
2048 | char *secstrings, struct module *mod) | |
2049 | { | |
2050 | const unsigned long shf_wx = SHF_WRITE|SHF_EXECINSTR; | |
2051 | int i; | |
2052 | ||
2053 | for (i = 0; i < hdr->e_shnum; i++) { | |
2054 | if ((sechdrs[i].sh_flags & shf_wx) == shf_wx) | |
2055 | return -ENOEXEC; | |
2056 | } | |
2057 | ||
2058 | return 0; | |
2059 | } | |
2060 | ||
93651f80 | 2061 | #else /* !CONFIG_STRICT_MODULE_RWX */ |
85c898db | 2062 | static void module_enable_nx(const struct module *mod) { } |
e6eff437 | 2063 | static void module_enable_ro(const struct module *mod, bool after_init) {} |
5c3a7db0 PZ |
2064 | static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, |
2065 | char *secstrings, struct module *mod) | |
2eef1399 | 2066 | { |
5c3a7db0 | 2067 | return 0; |
2eef1399 | 2068 | } |
93651f80 | 2069 | #endif /* CONFIG_STRICT_MODULE_RWX */ |
84e1c6bb | 2070 | |
1ce15ef4 JY |
2071 | #ifdef CONFIG_LIVEPATCH |
2072 | /* | |
2073 | * Persist Elf information about a module. Copy the Elf header, | |
2074 | * section header table, section string table, and symtab section | |
2075 | * index from info to mod->klp_info. | |
2076 | */ | |
2077 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2078 | { | |
2079 | unsigned int size, symndx; | |
2080 | int ret; | |
2081 | ||
2082 | size = sizeof(*mod->klp_info); | |
2083 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2084 | if (mod->klp_info == NULL) | |
2085 | return -ENOMEM; | |
2086 | ||
2087 | /* Elf header */ | |
2088 | size = sizeof(mod->klp_info->hdr); | |
2089 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2090 | ||
2091 | /* Elf section header table */ | |
2092 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2093 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2094 | if (mod->klp_info->sechdrs == NULL) { |
2095 | ret = -ENOMEM; | |
2096 | goto free_info; | |
2097 | } | |
1ce15ef4 JY |
2098 | |
2099 | /* Elf section name string table */ | |
2100 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2101 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2102 | if (mod->klp_info->secstrings == NULL) { |
2103 | ret = -ENOMEM; | |
2104 | goto free_sechdrs; | |
2105 | } | |
1ce15ef4 JY |
2106 | |
2107 | /* Elf symbol section index */ | |
2108 | symndx = info->index.sym; | |
2109 | mod->klp_info->symndx = symndx; | |
2110 | ||
2111 | /* | |
2112 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2113 | * copy of the original symbol table. Adjust sh_addr to point | |
2114 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2115 | * init memory is freed at the end of do_init_module(). | |
2116 | */ | |
2117 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2118 | (unsigned long) mod->core_kallsyms.symtab; | |
2119 | ||
2120 | return 0; | |
2121 | ||
2122 | free_sechdrs: | |
2123 | kfree(mod->klp_info->sechdrs); | |
2124 | free_info: | |
2125 | kfree(mod->klp_info); | |
2126 | return ret; | |
2127 | } | |
2128 | ||
2129 | static void free_module_elf(struct module *mod) | |
2130 | { | |
2131 | kfree(mod->klp_info->sechdrs); | |
2132 | kfree(mod->klp_info->secstrings); | |
2133 | kfree(mod->klp_info); | |
2134 | } | |
2135 | #else /* !CONFIG_LIVEPATCH */ | |
2136 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2137 | { | |
2138 | return 0; | |
2139 | } | |
2140 | ||
2141 | static void free_module_elf(struct module *mod) | |
2142 | { | |
2143 | } | |
2144 | #endif /* CONFIG_LIVEPATCH */ | |
2145 | ||
be1f221c | 2146 | void __weak module_memfree(void *module_region) |
74e08fcf | 2147 | { |
1a7b7d92 RE |
2148 | /* |
2149 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2150 | * supported by vmalloc. | |
2151 | */ | |
2152 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2153 | vfree(module_region); |
2154 | } | |
2155 | ||
2156 | void __weak module_arch_cleanup(struct module *mod) | |
2157 | { | |
2158 | } | |
2159 | ||
d453cded RR |
2160 | void __weak module_arch_freeing_init(struct module *mod) |
2161 | { | |
2162 | } | |
2163 | ||
75676500 | 2164 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2165 | static void free_module(struct module *mod) |
2166 | { | |
7ead8b83 LZ |
2167 | trace_module_free(mod); |
2168 | ||
36b0360d | 2169 | mod_sysfs_teardown(mod); |
1da177e4 | 2170 | |
944a1fa0 RR |
2171 | /* We leave it in list to prevent duplicate loads, but make sure |
2172 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2173 | mutex_lock(&module_mutex); |
944a1fa0 | 2174 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2175 | mutex_unlock(&module_mutex); |
944a1fa0 | 2176 | |
b82bab4b JB |
2177 | /* Remove dynamic debug info */ |
2178 | ddebug_remove_module(mod->name); | |
2179 | ||
1da177e4 LT |
2180 | /* Arch-specific cleanup. */ |
2181 | module_arch_cleanup(mod); | |
2182 | ||
2183 | /* Module unload stuff */ | |
2184 | module_unload_free(mod); | |
2185 | ||
e180a6b7 RR |
2186 | /* Free any allocated parameters. */ |
2187 | destroy_params(mod->kp, mod->num_kp); | |
2188 | ||
1ce15ef4 JY |
2189 | if (is_livepatch_module(mod)) |
2190 | free_module_elf(mod); | |
2191 | ||
944a1fa0 RR |
2192 | /* Now we can delete it from the lists */ |
2193 | mutex_lock(&module_mutex); | |
461e34ae MH |
2194 | /* Unlink carefully: kallsyms could be walking list. */ |
2195 | list_del_rcu(&mod->list); | |
93c2e105 | 2196 | mod_tree_remove(mod); |
0286b5ea | 2197 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2198 | module_bug_cleanup(mod); |
0be964be | 2199 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2200 | synchronize_rcu(); |
944a1fa0 RR |
2201 | mutex_unlock(&module_mutex); |
2202 | ||
85c898db | 2203 | /* This may be empty, but that's OK */ |
d453cded | 2204 | module_arch_freeing_init(mod); |
7523e4dc | 2205 | module_memfree(mod->init_layout.base); |
1da177e4 | 2206 | kfree(mod->args); |
259354de | 2207 | percpu_modfree(mod); |
9f85a4bb | 2208 | |
35a9393c | 2209 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2210 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2211 | |
1da177e4 | 2212 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2213 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2214 | } |
2215 | ||
2216 | void *__symbol_get(const char *symbol) | |
2217 | { | |
2218 | struct module *owner; | |
414fd31b | 2219 | const struct kernel_symbol *sym; |
1da177e4 | 2220 | |
24da1cbf | 2221 | preempt_disable(); |
ef1dac60 | 2222 | sym = find_symbol(symbol, &owner, NULL, NULL, true, true); |
414fd31b TA |
2223 | if (sym && strong_try_module_get(owner)) |
2224 | sym = NULL; | |
24da1cbf | 2225 | preempt_enable(); |
1da177e4 | 2226 | |
7290d580 | 2227 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2228 | } |
2229 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2230 | ||
eea8b54d AN |
2231 | /* |
2232 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2233 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2234 | * |
2235 | * You must hold the module_mutex. | |
eea8b54d | 2236 | */ |
2d25bc55 | 2237 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2238 | { |
b211104d | 2239 | unsigned int i; |
eea8b54d | 2240 | struct module *owner; |
b211104d RR |
2241 | const struct kernel_symbol *s; |
2242 | struct { | |
2243 | const struct kernel_symbol *sym; | |
2244 | unsigned int num; | |
2245 | } arr[] = { | |
2246 | { mod->syms, mod->num_syms }, | |
2247 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2248 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2249 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2250 | { mod->unused_syms, mod->num_unused_syms }, |
2251 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2252 | #endif |
b211104d | 2253 | }; |
eea8b54d | 2254 | |
b211104d RR |
2255 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2256 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 | 2257 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
ef1dac60 | 2258 | NULL, true, false)) { |
bddb12b3 | 2259 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2260 | " (owned by %s)\n", |
7290d580 AB |
2261 | mod->name, kernel_symbol_name(s), |
2262 | module_name(owner)); | |
b211104d RR |
2263 | return -ENOEXEC; |
2264 | } | |
eea8b54d | 2265 | } |
b211104d RR |
2266 | } |
2267 | return 0; | |
eea8b54d AN |
2268 | } |
2269 | ||
9a4b9708 | 2270 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2271 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2272 | { | |
2273 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2274 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2275 | unsigned long secbase; |
49668688 | 2276 | unsigned int i; |
1da177e4 | 2277 | int ret = 0; |
414fd31b | 2278 | const struct kernel_symbol *ksym; |
1da177e4 | 2279 | |
49668688 RR |
2280 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2281 | const char *name = info->strtab + sym[i].st_name; | |
2282 | ||
1da177e4 LT |
2283 | switch (sym[i].st_shndx) { |
2284 | case SHN_COMMON: | |
80375980 JM |
2285 | /* Ignore common symbols */ |
2286 | if (!strncmp(name, "__gnu_lto", 9)) | |
2287 | break; | |
2288 | ||
1da177e4 LT |
2289 | /* We compiled with -fno-common. These are not |
2290 | supposed to happen. */ | |
5e124169 | 2291 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2292 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2293 | mod->name); |
2294 | ret = -ENOEXEC; | |
2295 | break; | |
2296 | ||
2297 | case SHN_ABS: | |
2298 | /* Don't need to do anything */ | |
5e124169 | 2299 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2300 | (long)sym[i].st_value); |
2301 | break; | |
2302 | ||
1ce15ef4 JY |
2303 | case SHN_LIVEPATCH: |
2304 | /* Livepatch symbols are resolved by livepatch */ | |
2305 | break; | |
2306 | ||
1da177e4 | 2307 | case SHN_UNDEF: |
49668688 | 2308 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2309 | /* Ok if resolved. */ |
9bea7f23 | 2310 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2311 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2312 | break; |
414fd31b TA |
2313 | } |
2314 | ||
1da177e4 | 2315 | /* Ok if weak. */ |
9bea7f23 | 2316 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2317 | break; |
2318 | ||
9bea7f23 | 2319 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2320 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2321 | mod->name, name, ret); | |
1da177e4 LT |
2322 | break; |
2323 | ||
2324 | default: | |
2325 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2326 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2327 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2328 | else |
49668688 | 2329 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2330 | sym[i].st_value += secbase; |
2331 | break; | |
2332 | } | |
2333 | } | |
2334 | ||
2335 | return ret; | |
2336 | } | |
2337 | ||
49668688 | 2338 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2339 | { |
2340 | unsigned int i; | |
2341 | int err = 0; | |
2342 | ||
2343 | /* Now do relocations. */ | |
49668688 RR |
2344 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2345 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2346 | |
2347 | /* Not a valid relocation section? */ | |
49668688 | 2348 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2349 | continue; |
2350 | ||
2351 | /* Don't bother with non-allocated sections */ | |
49668688 | 2352 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2353 | continue; |
2354 | ||
1ce15ef4 | 2355 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) |
7c8e2bdd JP |
2356 | err = klp_apply_section_relocs(mod, info->sechdrs, |
2357 | info->secstrings, | |
2358 | info->strtab, | |
2359 | info->index.sym, i, | |
2360 | NULL); | |
2361 | else if (info->sechdrs[i].sh_type == SHT_REL) | |
49668688 RR |
2362 | err = apply_relocate(info->sechdrs, info->strtab, |
2363 | info->index.sym, i, mod); | |
2364 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2365 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2366 | info->index.sym, i, mod); | |
22e268eb RR |
2367 | if (err < 0) |
2368 | break; | |
2369 | } | |
2370 | return err; | |
2371 | } | |
2372 | ||
088af9a6 HD |
2373 | /* Additional bytes needed by arch in front of individual sections */ |
2374 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2375 | unsigned int section) | |
2376 | { | |
2377 | /* default implementation just returns zero */ | |
2378 | return 0; | |
2379 | } | |
2380 | ||
1da177e4 | 2381 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2382 | static long get_offset(struct module *mod, unsigned int *size, |
2383 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2384 | { |
2385 | long ret; | |
2386 | ||
088af9a6 | 2387 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2388 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2389 | *size = ret + sechdr->sh_size; | |
2390 | return ret; | |
2391 | } | |
2392 | ||
2393 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2394 | might -- code, read-only data, read-write data, small data. Tally | |
2395 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2396 | belongs in init. */ | |
49668688 | 2397 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2398 | { |
2399 | static unsigned long const masks[][2] = { | |
2400 | /* NOTE: all executable code must be the first section | |
2401 | * in this array; otherwise modify the text_size | |
2402 | * finder in the two loops below */ | |
2403 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2404 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2405 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2406 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2407 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2408 | }; | |
2409 | unsigned int m, i; | |
2410 | ||
49668688 RR |
2411 | for (i = 0; i < info->hdr->e_shnum; i++) |
2412 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2413 | |
5e124169 | 2414 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2415 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2416 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2417 | Elf_Shdr *s = &info->sechdrs[i]; | |
2418 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2419 | |
2420 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2421 | || (s->sh_flags & masks[m][1]) | |
2422 | || s->sh_entsize != ~0UL | |
23189766 | 2423 | || module_init_section(sname)) |
1da177e4 | 2424 | continue; |
7523e4dc | 2425 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2426 | pr_debug("\t%s\n", sname); |
1da177e4 | 2427 | } |
84e1c6bb MC |
2428 | switch (m) { |
2429 | case 0: /* executable */ | |
7523e4dc RR |
2430 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2431 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2432 | break; |
2433 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2434 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2435 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2436 | break; |
444d13ff JY |
2437 | case 2: /* RO after init */ |
2438 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2439 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2440 | break; | |
2441 | case 4: /* whole core */ | |
7523e4dc | 2442 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2443 | break; |
2444 | } | |
1da177e4 LT |
2445 | } |
2446 | ||
5e124169 | 2447 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2448 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2449 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2450 | Elf_Shdr *s = &info->sechdrs[i]; | |
2451 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2452 | |
2453 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2454 | || (s->sh_flags & masks[m][1]) | |
2455 | || s->sh_entsize != ~0UL | |
23189766 | 2456 | || !module_init_section(sname)) |
1da177e4 | 2457 | continue; |
7523e4dc | 2458 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2459 | | INIT_OFFSET_MASK); |
5e124169 | 2460 | pr_debug("\t%s\n", sname); |
1da177e4 | 2461 | } |
84e1c6bb MC |
2462 | switch (m) { |
2463 | case 0: /* executable */ | |
7523e4dc RR |
2464 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2465 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2466 | break; |
2467 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2468 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2469 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2470 | break; |
444d13ff JY |
2471 | case 2: |
2472 | /* | |
2473 | * RO after init doesn't apply to init_layout (only | |
2474 | * core_layout), so it just takes the value of ro_size. | |
2475 | */ | |
2476 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2477 | break; | |
2478 | case 4: /* whole init */ | |
7523e4dc | 2479 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2480 | break; |
2481 | } | |
1da177e4 LT |
2482 | } |
2483 | } | |
2484 | ||
1da177e4 LT |
2485 | static void set_license(struct module *mod, const char *license) |
2486 | { | |
2487 | if (!license) | |
2488 | license = "unspecified"; | |
2489 | ||
fa3ba2e8 | 2490 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2491 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2492 | pr_warn("%s: module license '%s' taints kernel.\n", |
2493 | mod->name, license); | |
373d4d09 RR |
2494 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2495 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2496 | } |
2497 | } | |
2498 | ||
2499 | /* Parse tag=value strings from .modinfo section */ | |
2500 | static char *next_string(char *string, unsigned long *secsize) | |
2501 | { | |
2502 | /* Skip non-zero chars */ | |
2503 | while (string[0]) { | |
2504 | string++; | |
2505 | if ((*secsize)-- <= 1) | |
2506 | return NULL; | |
2507 | } | |
2508 | ||
2509 | /* Skip any zero padding. */ | |
2510 | while (!string[0]) { | |
2511 | string++; | |
2512 | if ((*secsize)-- <= 1) | |
2513 | return NULL; | |
2514 | } | |
2515 | return string; | |
2516 | } | |
2517 | ||
c5e4a062 MM |
2518 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
2519 | char *prev) | |
1da177e4 LT |
2520 | { |
2521 | char *p; | |
2522 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2523 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2524 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2525 | |
5fdc7db6 JY |
2526 | /* |
2527 | * get_modinfo() calls made before rewrite_section_headers() | |
2528 | * must use sh_offset, as sh_addr isn't set! | |
2529 | */ | |
c5e4a062 MM |
2530 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
2531 | ||
2532 | if (prev) { | |
2533 | size -= prev - modinfo; | |
2534 | modinfo = next_string(prev, &size); | |
2535 | } | |
2536 | ||
2537 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2538 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2539 | return p + taglen + 1; | |
2540 | } | |
2541 | return NULL; | |
2542 | } | |
2543 | ||
c5e4a062 MM |
2544 | static char *get_modinfo(const struct load_info *info, const char *tag) |
2545 | { | |
2546 | return get_next_modinfo(info, tag, NULL); | |
2547 | } | |
2548 | ||
49668688 | 2549 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2550 | { |
2551 | struct module_attribute *attr; | |
2552 | int i; | |
2553 | ||
2554 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2555 | if (attr->setup) | |
49668688 | 2556 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2557 | } |
2558 | } | |
c988d2b2 | 2559 | |
a263f776 RR |
2560 | static void free_modinfo(struct module *mod) |
2561 | { | |
2562 | struct module_attribute *attr; | |
2563 | int i; | |
2564 | ||
2565 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2566 | if (attr->free) | |
2567 | attr->free(mod); | |
2568 | } | |
2569 | } | |
2570 | ||
1da177e4 | 2571 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2572 | |
2d25bc55 JY |
2573 | /* Lookup exported symbol in given range of kernel_symbols */ |
2574 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2575 | const struct kernel_symbol *start, | |
2576 | const struct kernel_symbol *stop) | |
15bba37d | 2577 | { |
9d63487f AIB |
2578 | return bsearch(name, start, stop - start, |
2579 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2580 | } |
2581 | ||
ca4787b7 TA |
2582 | static int is_exported(const char *name, unsigned long value, |
2583 | const struct module *mod) | |
1da177e4 | 2584 | { |
ca4787b7 TA |
2585 | const struct kernel_symbol *ks; |
2586 | if (!mod) | |
2d25bc55 | 2587 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2588 | else |
2d25bc55 JY |
2589 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2590 | ||
7290d580 | 2591 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2592 | } |
2593 | ||
2594 | /* As per nm */ | |
eded41c1 | 2595 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2596 | { |
eded41c1 RR |
2597 | const Elf_Shdr *sechdrs = info->sechdrs; |
2598 | ||
1da177e4 LT |
2599 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2600 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2601 | return 'v'; | |
2602 | else | |
2603 | return 'w'; | |
2604 | } | |
2605 | if (sym->st_shndx == SHN_UNDEF) | |
2606 | return 'U'; | |
e0224418 | 2607 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2608 | return 'a'; |
2609 | if (sym->st_shndx >= SHN_LORESERVE) | |
2610 | return '?'; | |
2611 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2612 | return 't'; | |
2613 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2614 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2615 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2616 | return 'r'; | |
2617 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2618 | return 'g'; | |
2619 | else | |
2620 | return 'd'; | |
2621 | } | |
2622 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2623 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2624 | return 's'; | |
2625 | else | |
2626 | return 'b'; | |
2627 | } | |
eded41c1 RR |
2628 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2629 | ".debug")) { | |
1da177e4 | 2630 | return 'n'; |
eded41c1 | 2631 | } |
1da177e4 LT |
2632 | return '?'; |
2633 | } | |
2634 | ||
4a496226 | 2635 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2636 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2637 | { |
2638 | const Elf_Shdr *sec; | |
2639 | ||
2640 | if (src->st_shndx == SHN_UNDEF | |
2641 | || src->st_shndx >= shnum | |
2642 | || !src->st_name) | |
2643 | return false; | |
2644 | ||
e0224418 MB |
2645 | #ifdef CONFIG_KALLSYMS_ALL |
2646 | if (src->st_shndx == pcpundx) | |
2647 | return true; | |
2648 | #endif | |
2649 | ||
4a496226 JB |
2650 | sec = sechdrs + src->st_shndx; |
2651 | if (!(sec->sh_flags & SHF_ALLOC) | |
2652 | #ifndef CONFIG_KALLSYMS_ALL | |
2653 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2654 | #endif | |
2655 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2656 | return false; | |
2657 | ||
2658 | return true; | |
2659 | } | |
2660 | ||
48fd1188 KC |
2661 | /* |
2662 | * We only allocate and copy the strings needed by the parts of symtab | |
2663 | * we keep. This is simple, but has the effect of making multiple | |
2664 | * copies of duplicates. We could be more sophisticated, see | |
2665 | * linux-kernel thread starting with | |
2666 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2667 | */ | |
49668688 | 2668 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2669 | { |
49668688 RR |
2670 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2671 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2672 | const Elf_Sym *src; |
54523ec7 | 2673 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2674 | |
2675 | /* Put symbol section at end of init part of module. */ | |
2676 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2677 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2678 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2679 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2680 | |
49668688 | 2681 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2682 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2683 | |
48fd1188 | 2684 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2685 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2686 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2687 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2688 | info->index.pcpu)) { | |
59ef28b1 | 2689 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2690 | ndst++; |
554bdfe5 | 2691 | } |
59ef28b1 | 2692 | } |
4a496226 JB |
2693 | |
2694 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2695 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2696 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2697 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2698 | info->core_typeoffs = mod->core_layout.size; |
2699 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2700 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2701 | |
554bdfe5 JB |
2702 | /* Put string table section at end of init part of module. */ |
2703 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2704 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2705 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2706 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2707 | |
2708 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2709 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2710 | __alignof__(struct mod_kallsyms)); | |
2711 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2712 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2713 | info->init_typeoffs = mod->init_layout.size; |
2714 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2715 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2716 | } |
2717 | ||
8244062e RR |
2718 | /* |
2719 | * We use the full symtab and strtab which layout_symtab arranged to | |
2720 | * be appended to the init section. Later we switch to the cut-down | |
2721 | * core-only ones. | |
2722 | */ | |
811d66a0 | 2723 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2724 | { |
4a496226 JB |
2725 | unsigned int i, ndst; |
2726 | const Elf_Sym *src; | |
2727 | Elf_Sym *dst; | |
554bdfe5 | 2728 | char *s; |
eded41c1 | 2729 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2730 | |
8244062e RR |
2731 | /* Set up to point into init section. */ |
2732 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2733 | ||
2734 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2735 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2736 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2737 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2738 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2739 | |
1c7651f4 EL |
2740 | /* |
2741 | * Now populate the cut down core kallsyms for after init | |
2742 | * and set types up while we still have access to sections. | |
2743 | */ | |
8244062e RR |
2744 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2745 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2746 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2747 | src = mod->kallsyms->symtab; |
2748 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2749 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2750 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2751 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2752 | info->index.pcpu)) { | |
1c7651f4 EL |
2753 | mod->core_kallsyms.typetab[ndst] = |
2754 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2755 | dst[ndst] = src[i]; |
8244062e RR |
2756 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2757 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2758 | KSYM_NAME_LEN) + 1; |
2759 | } | |
4a496226 | 2760 | } |
8244062e | 2761 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2762 | } |
2763 | #else | |
49668688 | 2764 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2765 | { |
2766 | } | |
3ae91c21 | 2767 | |
abbce906 | 2768 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2769 | { |
2770 | } | |
2771 | #endif /* CONFIG_KALLSYMS */ | |
2772 | ||
52796312 | 2773 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2774 | { |
811d66a0 RR |
2775 | if (!debug) |
2776 | return; | |
513770f5 | 2777 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2778 | } |
346e15be | 2779 | |
52796312 | 2780 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2781 | { |
2782 | if (debug) | |
52796312 | 2783 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2784 | } |
2785 | ||
74e08fcf JB |
2786 | void * __weak module_alloc(unsigned long size) |
2787 | { | |
82fab442 | 2788 | return vmalloc_exec(size); |
74e08fcf JB |
2789 | } |
2790 | ||
23189766 VW |
2791 | bool __weak module_init_section(const char *name) |
2792 | { | |
2793 | return strstarts(name, ".init"); | |
2794 | } | |
2795 | ||
38b37d63 MS |
2796 | bool __weak module_exit_section(const char *name) |
2797 | { | |
2798 | return strstarts(name, ".exit"); | |
2799 | } | |
2800 | ||
4f2294b6 | 2801 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2802 | static void kmemleak_load_module(const struct module *mod, |
2803 | const struct load_info *info) | |
4f2294b6 CM |
2804 | { |
2805 | unsigned int i; | |
2806 | ||
2807 | /* only scan the sections containing data */ | |
c017b4be | 2808 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2809 | |
49668688 | 2810 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2811 | /* Scan all writable sections that's not executable */ |
2812 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2813 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2814 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2815 | continue; |
2816 | ||
49668688 RR |
2817 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2818 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2819 | } |
2820 | } | |
2821 | #else | |
49668688 RR |
2822 | static inline void kmemleak_load_module(const struct module *mod, |
2823 | const struct load_info *info) | |
4f2294b6 CM |
2824 | { |
2825 | } | |
2826 | #endif | |
2827 | ||
106a4ee2 | 2828 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2829 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 | 2830 | { |
49fcf732 | 2831 | int err = -ENODATA; |
34e1169d | 2832 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
49fcf732 | 2833 | const char *reason; |
34e1169d | 2834 | const void *mod = info->hdr; |
caabe240 | 2835 | |
bca014ca BH |
2836 | /* |
2837 | * Require flags == 0, as a module with version information | |
2838 | * removed is no longer the module that was signed | |
2839 | */ | |
2840 | if (flags == 0 && | |
2841 | info->len > markerlen && | |
34e1169d | 2842 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2843 | /* We truncate the module to discard the signature */ |
34e1169d | 2844 | info->len -= markerlen; |
f314dfea | 2845 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2846 | } |
2847 | ||
49fcf732 DH |
2848 | switch (err) { |
2849 | case 0: | |
106a4ee2 RR |
2850 | info->sig_ok = true; |
2851 | return 0; | |
106a4ee2 | 2852 | |
49fcf732 DH |
2853 | /* We don't permit modules to be loaded into trusted kernels |
2854 | * without a valid signature on them, but if we're not | |
2855 | * enforcing, certain errors are non-fatal. | |
2856 | */ | |
2857 | case -ENODATA: | |
2858 | reason = "Loading of unsigned module"; | |
2859 | goto decide; | |
2860 | case -ENOPKG: | |
2861 | reason = "Loading of module with unsupported crypto"; | |
2862 | goto decide; | |
2863 | case -ENOKEY: | |
2864 | reason = "Loading of module with unavailable key"; | |
2865 | decide: | |
2866 | if (is_module_sig_enforced()) { | |
e9f35f63 | 2867 | pr_notice("%s: %s is rejected\n", info->name, reason); |
49fcf732 DH |
2868 | return -EKEYREJECTED; |
2869 | } | |
106a4ee2 | 2870 | |
49fcf732 DH |
2871 | return security_locked_down(LOCKDOWN_MODULE_SIGNATURE); |
2872 | ||
2873 | /* All other errors are fatal, including nomem, unparseable | |
2874 | * signatures and signature check failures - even if signatures | |
2875 | * aren't required. | |
2876 | */ | |
2877 | default: | |
2878 | return err; | |
2879 | } | |
106a4ee2 RR |
2880 | } |
2881 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2882 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2883 | { |
2884 | return 0; | |
2885 | } | |
2886 | #endif /* !CONFIG_MODULE_SIG */ | |
2887 | ||
34e1169d KC |
2888 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2889 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2890 | { |
34e1169d KC |
2891 | if (info->len < sizeof(*(info->hdr))) |
2892 | return -ENOEXEC; | |
2893 | ||
2894 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2895 | || info->hdr->e_type != ET_REL | |
2896 | || !elf_check_arch(info->hdr) | |
2897 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2898 | return -ENOEXEC; | |
2899 | ||
2900 | if (info->hdr->e_shoff >= info->len | |
2901 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2902 | info->len - info->hdr->e_shoff)) | |
2903 | return -ENOEXEC; | |
40dd2560 | 2904 | |
34e1169d KC |
2905 | return 0; |
2906 | } | |
2907 | ||
3afe9f84 LT |
2908 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2909 | ||
2910 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2911 | { | |
2912 | do { | |
2913 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2914 | ||
2915 | if (copy_from_user(dst, usrc, n) != 0) | |
2916 | return -EFAULT; | |
2917 | cond_resched(); | |
2918 | dst += n; | |
2919 | usrc += n; | |
2920 | len -= n; | |
2921 | } while (len); | |
2922 | return 0; | |
2923 | } | |
2924 | ||
1ce15ef4 | 2925 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2926 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2927 | { |
2992ef29 JP |
2928 | if (get_modinfo(info, "livepatch")) { |
2929 | mod->klp = true; | |
2930 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2931 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2932 | mod->name); | |
2992ef29 | 2933 | } |
1ce15ef4 JY |
2934 | |
2935 | return 0; | |
2936 | } | |
2937 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2938 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2939 | { |
2940 | if (get_modinfo(info, "livepatch")) { | |
2941 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2942 | mod->name); | |
2943 | return -ENOEXEC; | |
2944 | } | |
2945 | ||
2946 | return 0; | |
2947 | } | |
2948 | #endif /* CONFIG_LIVEPATCH */ | |
2949 | ||
caf7501a AK |
2950 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2951 | { | |
2952 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2953 | return; | |
2954 | ||
2955 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2956 | mod->name); | |
2957 | } | |
2958 | ||
34e1169d KC |
2959 | /* Sets info->hdr and info->len. */ |
2960 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2961 | struct load_info *info) | |
40dd2560 RR |
2962 | { |
2963 | int err; | |
40dd2560 | 2964 | |
34e1169d KC |
2965 | info->len = len; |
2966 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2967 | return -ENOEXEC; |
2968 | ||
c77b8cdf | 2969 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2970 | if (err) |
2971 | return err; | |
2972 | ||
40dd2560 | 2973 | /* Suck in entire file: we'll want most of it. */ |
88dca4ca | 2974 | info->hdr = __vmalloc(info->len, GFP_KERNEL | __GFP_NOWARN); |
34e1169d | 2975 | if (!info->hdr) |
40dd2560 RR |
2976 | return -ENOMEM; |
2977 | ||
3afe9f84 | 2978 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2979 | vfree(info->hdr); |
2980 | return -EFAULT; | |
40dd2560 RR |
2981 | } |
2982 | ||
34e1169d KC |
2983 | return 0; |
2984 | } | |
2985 | ||
d913188c RR |
2986 | static void free_copy(struct load_info *info) |
2987 | { | |
d913188c RR |
2988 | vfree(info->hdr); |
2989 | } | |
2990 | ||
2f3238ae | 2991 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2992 | { |
2993 | unsigned int i; | |
2994 | ||
2995 | /* This should always be true, but let's be sure. */ | |
2996 | info->sechdrs[0].sh_addr = 0; | |
2997 | ||
2998 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2999 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
3000 | if (shdr->sh_type != SHT_NOBITS | |
3001 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 3002 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
3003 | return -ENOEXEC; |
3004 | } | |
3005 | ||
3006 | /* Mark all sections sh_addr with their address in the | |
3007 | temporary image. */ | |
3008 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
3009 | ||
3010 | #ifndef CONFIG_MODULE_UNLOAD | |
3011 | /* Don't load .exit sections */ | |
38b37d63 | 3012 | if (module_exit_section(info->secstrings+shdr->sh_name)) |
8b5f61a7 RR |
3013 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; |
3014 | #endif | |
8b5f61a7 | 3015 | } |
d6df72a0 RR |
3016 | |
3017 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 3018 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 3019 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 3020 | |
8b5f61a7 RR |
3021 | return 0; |
3022 | } | |
3023 | ||
3264d3f9 LT |
3024 | /* |
3025 | * Set up our basic convenience variables (pointers to section headers, | |
3026 | * search for module section index etc), and do some basic section | |
3027 | * verification. | |
3028 | * | |
81a0abd9 JY |
3029 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
3030 | * will be allocated in move_module(). | |
3264d3f9 | 3031 | */ |
81a0abd9 | 3032 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
3033 | { |
3034 | unsigned int i; | |
3264d3f9 LT |
3035 | |
3036 | /* Set up the convenience variables */ | |
3037 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
3038 | info->secstrings = (void *)info->hdr |
3039 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 3040 | |
5fdc7db6 JY |
3041 | /* Try to find a name early so we can log errors with a module name */ |
3042 | info->index.info = find_sec(info, ".modinfo"); | |
708e0ada | 3043 | if (info->index.info) |
5fdc7db6 | 3044 | info->name = get_modinfo(info, "name"); |
3264d3f9 | 3045 | |
8b5f61a7 RR |
3046 | /* Find internal symbols and strings. */ |
3047 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
3048 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
3049 | info->index.sym = i; | |
3050 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
3051 | info->strtab = (char *)info->hdr |
3052 | + info->sechdrs[info->index.str].sh_offset; | |
3053 | break; | |
3264d3f9 | 3054 | } |
3264d3f9 LT |
3055 | } |
3056 | ||
5fdc7db6 | 3057 | if (info->index.sym == 0) { |
708e0ada JY |
3058 | pr_warn("%s: module has no symbols (stripped?)\n", |
3059 | info->name ?: "(missing .modinfo section or name field)"); | |
5fdc7db6 JY |
3060 | return -ENOEXEC; |
3061 | } | |
3062 | ||
49668688 | 3063 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 3064 | if (!info->index.mod) { |
3e2e857f | 3065 | pr_warn("%s: No module found in object\n", |
708e0ada | 3066 | info->name ?: "(missing .modinfo section or name field)"); |
81a0abd9 | 3067 | return -ENOEXEC; |
3264d3f9 LT |
3068 | } |
3069 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 3070 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 3071 | |
3e2e857f | 3072 | /* |
5fdc7db6 | 3073 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
3074 | * on-disk struct mod 'name' field. |
3075 | */ | |
3076 | if (!info->name) | |
81a0abd9 | 3077 | info->name = info->mod->name; |
3e2e857f | 3078 | |
5fdc7db6 JY |
3079 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
3080 | info->index.vers = 0; /* Pretend no __versions section! */ | |
3081 | else | |
3082 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 3083 | |
49668688 | 3084 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3085 | |
81a0abd9 | 3086 | return 0; |
3264d3f9 LT |
3087 | } |
3088 | ||
2f3238ae | 3089 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3090 | { |
49668688 | 3091 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3092 | int err; |
3093 | ||
2f3238ae RR |
3094 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3095 | modmagic = NULL; | |
3096 | ||
40dd2560 RR |
3097 | /* This is allowed: modprobe --force will invalidate it. */ |
3098 | if (!modmagic) { | |
3099 | err = try_to_force_load(mod, "bad vermagic"); | |
3100 | if (err) | |
3101 | return err; | |
49668688 | 3102 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3103 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3104 | info->name, modmagic, vermagic); |
40dd2560 RR |
3105 | return -ENOEXEC; |
3106 | } | |
3107 | ||
3205c36c LP |
3108 | if (!get_modinfo(info, "intree")) { |
3109 | if (!test_taint(TAINT_OOT_MODULE)) | |
3110 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3111 | mod->name); | |
373d4d09 | 3112 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3113 | } |
2449b8ba | 3114 | |
caf7501a AK |
3115 | check_modinfo_retpoline(mod, info); |
3116 | ||
49668688 | 3117 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3118 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3119 | pr_warn("%s: module is from the staging directory, the quality " |
3120 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3121 | } |
22e268eb | 3122 | |
2992ef29 | 3123 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3124 | if (err) |
3125 | return err; | |
3126 | ||
22e268eb | 3127 | /* Set up license info based on the info section */ |
49668688 | 3128 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3129 | |
40dd2560 RR |
3130 | return 0; |
3131 | } | |
3132 | ||
eb3057df | 3133 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3134 | { |
49668688 | 3135 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3136 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3137 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3138 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3139 | mod->crcs = section_addr(info, "__kcrctab"); |
3140 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3141 | sizeof(*mod->gpl_syms), |
3142 | &mod->num_gpl_syms); | |
49668688 RR |
3143 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3144 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3145 | "__ksymtab_gpl_future", |
3146 | sizeof(*mod->gpl_future_syms), | |
3147 | &mod->num_gpl_future_syms); | |
49668688 | 3148 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3149 | |
3150 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3151 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3152 | sizeof(*mod->unused_syms), |
3153 | &mod->num_unused_syms); | |
49668688 RR |
3154 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3155 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3156 | sizeof(*mod->unused_gpl_syms), |
3157 | &mod->num_unused_gpl_syms); | |
49668688 | 3158 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3159 | #endif |
3160 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3161 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3162 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3163 | if (!mod->ctors) |
3164 | mod->ctors = section_objs(info, ".init_array", | |
3165 | sizeof(*mod->ctors), &mod->num_ctors); | |
3166 | else if (find_sec(info, ".init_array")) { | |
3167 | /* | |
3168 | * This shouldn't happen with same compiler and binutils | |
3169 | * building all parts of the module. | |
3170 | */ | |
6da0b565 | 3171 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3172 | mod->name); |
3173 | return -EINVAL; | |
3174 | } | |
f91a13bb LT |
3175 | #endif |
3176 | ||
66e9b071 TG |
3177 | mod->noinstr_text_start = section_objs(info, ".noinstr.text", 1, |
3178 | &mod->noinstr_text_size); | |
3179 | ||
f91a13bb | 3180 | #ifdef CONFIG_TRACEPOINTS |
65498646 MD |
3181 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3182 | sizeof(*mod->tracepoints_ptrs), | |
3183 | &mod->num_tracepoints); | |
f91a13bb | 3184 | #endif |
fe15b50c PM |
3185 | #ifdef CONFIG_TREE_SRCU |
3186 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
3187 | sizeof(*mod->srcu_struct_ptrs), | |
3188 | &mod->num_srcu_structs); | |
3189 | #endif | |
a38d1107 MM |
3190 | #ifdef CONFIG_BPF_EVENTS |
3191 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3192 | sizeof(*mod->bpf_raw_events), | |
3193 | &mod->num_bpf_raw_events); | |
3194 | #endif | |
e9666d10 | 3195 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3196 | mod->jump_entries = section_objs(info, "__jump_table", |
3197 | sizeof(*mod->jump_entries), | |
3198 | &mod->num_jump_entries); | |
3199 | #endif | |
f91a13bb | 3200 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3201 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3202 | sizeof(*mod->trace_events), |
3203 | &mod->num_trace_events); | |
99be647c JL |
3204 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3205 | sizeof(*mod->trace_evals), | |
3206 | &mod->num_trace_evals); | |
f91a13bb | 3207 | #endif |
13b9b6e7 SR |
3208 | #ifdef CONFIG_TRACING |
3209 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3210 | sizeof(*mod->trace_bprintk_fmt_start), | |
3211 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3212 | #endif |
f91a13bb LT |
3213 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3214 | /* sechdrs[0].sh_size is always zero */ | |
a1326b17 | 3215 | mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION, |
f91a13bb LT |
3216 | sizeof(*mod->ftrace_callsites), |
3217 | &mod->num_ftrace_callsites); | |
3218 | #endif | |
540adea3 MH |
3219 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3220 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3221 | sizeof(*mod->ei_funcs), | |
3222 | &mod->num_ei_funcs); | |
1e6769b0 MH |
3223 | #endif |
3224 | #ifdef CONFIG_KPROBES | |
3225 | mod->kprobes_text_start = section_objs(info, ".kprobes.text", 1, | |
3226 | &mod->kprobes_text_size); | |
16db6264 MH |
3227 | mod->kprobe_blacklist = section_objs(info, "_kprobe_blacklist", |
3228 | sizeof(unsigned long), | |
3229 | &mod->num_kprobe_blacklist); | |
92ace999 | 3230 | #endif |
811d66a0 RR |
3231 | mod->extable = section_objs(info, "__ex_table", |
3232 | sizeof(*mod->extable), &mod->num_exentries); | |
3233 | ||
49668688 | 3234 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3235 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3236 | |
3237 | info->debug = section_objs(info, "__verbose", | |
3238 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3239 | |
3240 | return 0; | |
f91a13bb LT |
3241 | } |
3242 | ||
49668688 | 3243 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3244 | { |
3245 | int i; | |
3246 | void *ptr; | |
3247 | ||
3248 | /* Do the allocs. */ | |
7523e4dc | 3249 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3250 | /* |
3251 | * The pointer to this block is stored in the module structure | |
3252 | * which is inside the block. Just mark it as not being a | |
3253 | * leak. | |
3254 | */ | |
3255 | kmemleak_not_leak(ptr); | |
3256 | if (!ptr) | |
d913188c | 3257 | return -ENOMEM; |
65b8a9b4 | 3258 | |
7523e4dc RR |
3259 | memset(ptr, 0, mod->core_layout.size); |
3260 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3261 | |
7523e4dc RR |
3262 | if (mod->init_layout.size) { |
3263 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3264 | /* |
3265 | * The pointer to this block is stored in the module structure | |
3266 | * which is inside the block. This block doesn't need to be | |
3267 | * scanned as it contains data and code that will be freed | |
3268 | * after the module is initialized. | |
3269 | */ | |
3270 | kmemleak_ignore(ptr); | |
3271 | if (!ptr) { | |
7523e4dc | 3272 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3273 | return -ENOMEM; |
3274 | } | |
7523e4dc RR |
3275 | memset(ptr, 0, mod->init_layout.size); |
3276 | mod->init_layout.base = ptr; | |
82fab442 | 3277 | } else |
7523e4dc | 3278 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3279 | |
3280 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3281 | pr_debug("final section addresses:\n"); |
49668688 | 3282 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3283 | void *dest; |
49668688 | 3284 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3285 | |
49668688 | 3286 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3287 | continue; |
3288 | ||
49668688 | 3289 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3290 | dest = mod->init_layout.base |
49668688 | 3291 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3292 | else |
7523e4dc | 3293 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3294 | |
49668688 RR |
3295 | if (shdr->sh_type != SHT_NOBITS) |
3296 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3297 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3298 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3299 | pr_debug("\t0x%lx %s\n", |
3300 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3301 | } |
d913188c RR |
3302 | |
3303 | return 0; | |
65b8a9b4 LT |
3304 | } |
3305 | ||
49668688 | 3306 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3307 | { |
3205c36c LP |
3308 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3309 | ||
22e268eb RR |
3310 | /* |
3311 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3312 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3313 | * using GPL-only symbols it needs. | |
3314 | */ | |
3315 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3316 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3317 | |
3318 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3319 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3320 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3321 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3322 | |
c99af375 MG |
3323 | /* lve claims to be GPL but upstream won't provide source */ |
3324 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3325 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3326 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3327 | |
3205c36c LP |
3328 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3329 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3330 | ||
22e268eb RR |
3331 | #ifdef CONFIG_MODVERSIONS |
3332 | if ((mod->num_syms && !mod->crcs) | |
3333 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3334 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3335 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3336 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3337 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3338 | #endif | |
3339 | ) { | |
3340 | return try_to_force_load(mod, | |
3341 | "no versions for exported symbols"); | |
3342 | } | |
3343 | #endif | |
3344 | return 0; | |
3345 | } | |
3346 | ||
3347 | static void flush_module_icache(const struct module *mod) | |
3348 | { | |
22e268eb RR |
3349 | /* |
3350 | * Flush the instruction cache, since we've played with text. | |
3351 | * Do it before processing of module parameters, so the module | |
3352 | * can provide parameter accessor functions of its own. | |
3353 | */ | |
7523e4dc RR |
3354 | if (mod->init_layout.base) |
3355 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3356 | (unsigned long)mod->init_layout.base | |
3357 | + mod->init_layout.size); | |
3358 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3359 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3360 | } |
3361 | ||
74e08fcf JB |
3362 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3363 | Elf_Shdr *sechdrs, | |
3364 | char *secstrings, | |
3365 | struct module *mod) | |
3366 | { | |
3367 | return 0; | |
3368 | } | |
3369 | ||
be7de5f9 PB |
3370 | /* module_blacklist is a comma-separated list of module names */ |
3371 | static char *module_blacklist; | |
96b5b194 | 3372 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3373 | { |
3374 | const char *p; | |
3375 | size_t len; | |
3376 | ||
3377 | if (!module_blacklist) | |
3378 | return false; | |
3379 | ||
3380 | for (p = module_blacklist; *p; p += len) { | |
3381 | len = strcspn(p, ","); | |
3382 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3383 | return true; | |
3384 | if (p[len] == ',') | |
3385 | len++; | |
3386 | } | |
3387 | return false; | |
3388 | } | |
3389 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3390 | ||
2f3238ae | 3391 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3392 | { |
1da177e4 | 3393 | struct module *mod; |
444d13ff | 3394 | unsigned int ndx; |
d913188c | 3395 | int err; |
3ae91c21 | 3396 | |
81a0abd9 | 3397 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3398 | if (err) |
3399 | return ERR_PTR(err); | |
1da177e4 | 3400 | |
1da177e4 | 3401 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3402 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3403 | info->secstrings, info->mod); |
1da177e4 | 3404 | if (err < 0) |
8d8022e8 | 3405 | return ERR_PTR(err); |
1da177e4 | 3406 | |
5c3a7db0 PZ |
3407 | err = module_enforce_rwx_sections(info->hdr, info->sechdrs, |
3408 | info->secstrings, info->mod); | |
3409 | if (err < 0) | |
3410 | return ERR_PTR(err); | |
3411 | ||
8d8022e8 RR |
3412 | /* We will do a special allocation for per-cpu sections later. */ |
3413 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3414 | |
444d13ff JY |
3415 | /* |
3416 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3417 | * layout_sections() can put it in the right place. | |
3418 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3419 | */ | |
3420 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3421 | if (ndx) |
3422 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3423 | /* | |
3424 | * Mark the __jump_table section as ro_after_init as well: these data | |
3425 | * structures are never modified, with the exception of entries that | |
3426 | * refer to code in the __init section, which are annotated as such | |
3427 | * at module load time. | |
3428 | */ | |
3429 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3430 | if (ndx) |
3431 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3432 | ||
1da177e4 LT |
3433 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3434 | this is done generically; there doesn't appear to be any | |
3435 | special cases for the architectures. */ | |
81a0abd9 JY |
3436 | layout_sections(info->mod, info); |
3437 | layout_symtab(info->mod, info); | |
1da177e4 | 3438 | |
65b8a9b4 | 3439 | /* Allocate and move to the final place */ |
81a0abd9 | 3440 | err = move_module(info->mod, info); |
d913188c | 3441 | if (err) |
8d8022e8 | 3442 | return ERR_PTR(err); |
d913188c RR |
3443 | |
3444 | /* Module has been copied to its final place now: return it. */ | |
3445 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3446 | kmemleak_load_module(mod, info); |
d913188c | 3447 | return mod; |
d913188c RR |
3448 | } |
3449 | ||
3450 | /* mod is no longer valid after this! */ | |
3451 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3452 | { | |
d913188c | 3453 | percpu_modfree(mod); |
d453cded | 3454 | module_arch_freeing_init(mod); |
7523e4dc RR |
3455 | module_memfree(mod->init_layout.base); |
3456 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3457 | } |
3458 | ||
74e08fcf JB |
3459 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3460 | const Elf_Shdr *sechdrs, | |
3461 | struct module *me) | |
3462 | { | |
3463 | return 0; | |
3464 | } | |
3465 | ||
811d66a0 RR |
3466 | static int post_relocation(struct module *mod, const struct load_info *info) |
3467 | { | |
51f3d0f4 | 3468 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3469 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3470 | ||
3471 | /* Copy relocated percpu area over. */ | |
3472 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3473 | info->sechdrs[info->index.pcpu].sh_size); | |
3474 | ||
51f3d0f4 | 3475 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3476 | add_kallsyms(mod, info); |
3477 | ||
3478 | /* Arch-specific module finalizing. */ | |
3479 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3480 | } | |
3481 | ||
9bb9c3be RR |
3482 | /* Is this module of this name done loading? No locks held. */ |
3483 | static bool finished_loading(const char *name) | |
3484 | { | |
3485 | struct module *mod; | |
3486 | bool ret; | |
3487 | ||
9cc019b8 PZ |
3488 | /* |
3489 | * The module_mutex should not be a heavily contended lock; | |
3490 | * if we get the occasional sleep here, we'll go an extra iteration | |
3491 | * in the wait_event_interruptible(), which is harmless. | |
3492 | */ | |
3493 | sched_annotate_sleep(); | |
9bb9c3be | 3494 | mutex_lock(&module_mutex); |
4f6de4d5 | 3495 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 3496 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
3497 | mutex_unlock(&module_mutex); |
3498 | ||
3499 | return ret; | |
3500 | } | |
3501 | ||
34e1169d KC |
3502 | /* Call module constructors. */ |
3503 | static void do_mod_ctors(struct module *mod) | |
3504 | { | |
3505 | #ifdef CONFIG_CONSTRUCTORS | |
3506 | unsigned long i; | |
3507 | ||
3508 | for (i = 0; i < mod->num_ctors; i++) | |
3509 | mod->ctors[i](); | |
3510 | #endif | |
3511 | } | |
3512 | ||
c7496379 RR |
3513 | /* For freeing module_init on success, in case kallsyms traversing */ |
3514 | struct mod_initfree { | |
1a7b7d92 | 3515 | struct llist_node node; |
c7496379 RR |
3516 | void *module_init; |
3517 | }; | |
3518 | ||
1a7b7d92 | 3519 | static void do_free_init(struct work_struct *w) |
c7496379 | 3520 | { |
1a7b7d92 RE |
3521 | struct llist_node *pos, *n, *list; |
3522 | struct mod_initfree *initfree; | |
3523 | ||
3524 | list = llist_del_all(&init_free_list); | |
3525 | ||
3526 | synchronize_rcu(); | |
3527 | ||
3528 | llist_for_each_safe(pos, n, list) { | |
3529 | initfree = container_of(pos, struct mod_initfree, node); | |
3530 | module_memfree(initfree->module_init); | |
3531 | kfree(initfree); | |
3532 | } | |
c7496379 RR |
3533 | } |
3534 | ||
1a7b7d92 RE |
3535 | static int __init modules_wq_init(void) |
3536 | { | |
3537 | INIT_WORK(&init_free_wq, do_free_init); | |
3538 | init_llist_head(&init_free_list); | |
3539 | return 0; | |
3540 | } | |
3541 | module_init(modules_wq_init); | |
3542 | ||
be02a186 JK |
3543 | /* |
3544 | * This is where the real work happens. | |
3545 | * | |
3546 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3547 | * helper command 'lx-symbols'. | |
3548 | */ | |
3549 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3550 | { |
3551 | int ret = 0; | |
c7496379 RR |
3552 | struct mod_initfree *freeinit; |
3553 | ||
3554 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3555 | if (!freeinit) { | |
3556 | ret = -ENOMEM; | |
3557 | goto fail; | |
3558 | } | |
7523e4dc | 3559 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3560 | |
774a1221 TH |
3561 | /* |
3562 | * We want to find out whether @mod uses async during init. Clear | |
3563 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3564 | */ | |
3565 | current->flags &= ~PF_USED_ASYNC; | |
3566 | ||
34e1169d KC |
3567 | do_mod_ctors(mod); |
3568 | /* Start the module */ | |
3569 | if (mod->init != NULL) | |
3570 | ret = do_one_initcall(mod->init); | |
3571 | if (ret < 0) { | |
c7496379 | 3572 | goto fail_free_freeinit; |
34e1169d KC |
3573 | } |
3574 | if (ret > 0) { | |
bddb12b3 AM |
3575 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3576 | "follow 0/-E convention\n" | |
3577 | "%s: loading module anyway...\n", | |
3578 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3579 | dump_stack(); |
3580 | } | |
3581 | ||
3582 | /* Now it's a first class citizen! */ | |
3583 | mod->state = MODULE_STATE_LIVE; | |
3584 | blocking_notifier_call_chain(&module_notify_list, | |
3585 | MODULE_STATE_LIVE, mod); | |
3586 | ||
774a1221 TH |
3587 | /* |
3588 | * We need to finish all async code before the module init sequence | |
3589 | * is done. This has potential to deadlock. For example, a newly | |
3590 | * detected block device can trigger request_module() of the | |
3591 | * default iosched from async probing task. Once userland helper | |
3592 | * reaches here, async_synchronize_full() will wait on the async | |
3593 | * task waiting on request_module() and deadlock. | |
3594 | * | |
3595 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3596 | * iff module init queued any async jobs. This isn't a full | |
3597 | * solution as it will deadlock the same if module loading from | |
3598 | * async jobs nests more than once; however, due to the various | |
3599 | * constraints, this hack seems to be the best option for now. | |
3600 | * Please refer to the following thread for details. | |
3601 | * | |
3602 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3603 | */ | |
f2411da7 | 3604 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3605 | async_synchronize_full(); |
34e1169d | 3606 | |
aba4b5c2 | 3607 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3608 | mod->init_layout.size); |
34e1169d KC |
3609 | mutex_lock(&module_mutex); |
3610 | /* Drop initial reference. */ | |
3611 | module_put(mod); | |
3612 | trim_init_extable(mod); | |
3613 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3614 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3615 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3616 | #endif |
444d13ff | 3617 | module_enable_ro(mod, true); |
93c2e105 | 3618 | mod_tree_remove_init(mod); |
d453cded | 3619 | module_arch_freeing_init(mod); |
7523e4dc RR |
3620 | mod->init_layout.base = NULL; |
3621 | mod->init_layout.size = 0; | |
3622 | mod->init_layout.ro_size = 0; | |
444d13ff | 3623 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3624 | mod->init_layout.text_size = 0; |
c7496379 RR |
3625 | /* |
3626 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3627 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3628 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3629 | * path. module_memfree() cannot be called in an interrupt, so do the |
3630 | * work and call synchronize_rcu() in a work queue. | |
3631 | * | |
ae646f0b JH |
3632 | * Note that module_alloc() on most architectures creates W+X page |
3633 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3634 | * code such as mark_rodata_ro() which depends on those mappings to | |
3635 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3636 | * rcu_barrier() |
c7496379 | 3637 | */ |
1a7b7d92 RE |
3638 | if (llist_add(&freeinit->node, &init_free_list)) |
3639 | schedule_work(&init_free_wq); | |
3640 | ||
34e1169d KC |
3641 | mutex_unlock(&module_mutex); |
3642 | wake_up_all(&module_wq); | |
3643 | ||
3644 | return 0; | |
c7496379 RR |
3645 | |
3646 | fail_free_freeinit: | |
3647 | kfree(freeinit); | |
3648 | fail: | |
3649 | /* Try to protect us from buggy refcounters. */ | |
3650 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3651 | synchronize_rcu(); |
c7496379 RR |
3652 | module_put(mod); |
3653 | blocking_notifier_call_chain(&module_notify_list, | |
3654 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3655 | klp_module_going(mod); |
7dcd182b | 3656 | ftrace_release_mod(mod); |
c7496379 RR |
3657 | free_module(mod); |
3658 | wake_up_all(&module_wq); | |
3659 | return ret; | |
34e1169d KC |
3660 | } |
3661 | ||
3662 | static int may_init_module(void) | |
3663 | { | |
3664 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3665 | return -EPERM; | |
3666 | ||
3667 | return 0; | |
3668 | } | |
3669 | ||
a3535c7e RR |
3670 | /* |
3671 | * We try to place it in the list now to make sure it's unique before | |
3672 | * we dedicate too many resources. In particular, temporary percpu | |
3673 | * memory exhaustion. | |
3674 | */ | |
3675 | static int add_unformed_module(struct module *mod) | |
3676 | { | |
3677 | int err; | |
3678 | struct module *old; | |
3679 | ||
3680 | mod->state = MODULE_STATE_UNFORMED; | |
3681 | ||
3682 | again: | |
3683 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3684 | old = find_module_all(mod->name, strlen(mod->name), true); |
3685 | if (old != NULL) { | |
6e6de3de | 3686 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
3687 | /* Wait in case it fails to load. */ |
3688 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3689 | err = wait_event_interruptible(module_wq, |
3690 | finished_loading(mod->name)); | |
a3535c7e RR |
3691 | if (err) |
3692 | goto out_unlocked; | |
3693 | goto again; | |
3694 | } | |
3695 | err = -EEXIST; | |
3696 | goto out; | |
3697 | } | |
4f666546 | 3698 | mod_update_bounds(mod); |
a3535c7e | 3699 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3700 | mod_tree_insert(mod); |
a3535c7e RR |
3701 | err = 0; |
3702 | ||
3703 | out: | |
3704 | mutex_unlock(&module_mutex); | |
3705 | out_unlocked: | |
3706 | return err; | |
3707 | } | |
3708 | ||
3709 | static int complete_formation(struct module *mod, struct load_info *info) | |
3710 | { | |
3711 | int err; | |
3712 | ||
3713 | mutex_lock(&module_mutex); | |
3714 | ||
3715 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3716 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3717 | if (err < 0) |
3718 | goto out; | |
3719 | ||
3720 | /* This relies on module_mutex for list integrity. */ | |
3721 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3722 | ||
444d13ff | 3723 | module_enable_ro(mod, false); |
85c898db | 3724 | module_enable_nx(mod); |
af742623 | 3725 | module_enable_x(mod); |
4982223e | 3726 | |
a3535c7e RR |
3727 | /* Mark state as coming so strong_try_module_get() ignores us, |
3728 | * but kallsyms etc. can see us. */ | |
3729 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3730 | mutex_unlock(&module_mutex); |
3731 | ||
4982223e | 3732 | return 0; |
a3535c7e RR |
3733 | |
3734 | out: | |
3735 | mutex_unlock(&module_mutex); | |
3736 | return err; | |
3737 | } | |
3738 | ||
4c973d16 JY |
3739 | static int prepare_coming_module(struct module *mod) |
3740 | { | |
7e545d6e JY |
3741 | int err; |
3742 | ||
4c973d16 | 3743 | ftrace_module_enable(mod); |
7e545d6e JY |
3744 | err = klp_module_coming(mod); |
3745 | if (err) | |
3746 | return err; | |
3747 | ||
4c973d16 JY |
3748 | blocking_notifier_call_chain(&module_notify_list, |
3749 | MODULE_STATE_COMING, mod); | |
3750 | return 0; | |
3751 | } | |
3752 | ||
ecc86170 LR |
3753 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3754 | void *arg) | |
54041d8a | 3755 | { |
f2411da7 LR |
3756 | struct module *mod = arg; |
3757 | int ret; | |
3758 | ||
3759 | if (strcmp(param, "async_probe") == 0) { | |
3760 | mod->async_probe_requested = true; | |
3761 | return 0; | |
3762 | } | |
3763 | ||
6da0b565 | 3764 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3765 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3766 | if (ret != 0) |
3767 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3768 | return 0; |
3769 | } | |
3770 | ||
d913188c RR |
3771 | /* Allocate and load the module: note that size of section 0 is always |
3772 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3773 | static int load_module(struct load_info *info, const char __user *uargs, |
3774 | int flags) | |
d913188c | 3775 | { |
a3535c7e | 3776 | struct module *mod; |
5fdc7db6 | 3777 | long err = 0; |
51e158c1 | 3778 | char *after_dashes; |
d913188c | 3779 | |
5fdc7db6 JY |
3780 | err = elf_header_check(info); |
3781 | if (err) | |
3782 | goto free_copy; | |
3783 | ||
3784 | err = setup_load_info(info, flags); | |
3785 | if (err) | |
3786 | goto free_copy; | |
3787 | ||
3788 | if (blacklisted(info->name)) { | |
3789 | err = -EPERM; | |
3790 | goto free_copy; | |
3791 | } | |
3792 | ||
bca014ca | 3793 | err = module_sig_check(info, flags); |
34e1169d KC |
3794 | if (err) |
3795 | goto free_copy; | |
d913188c | 3796 | |
5fdc7db6 | 3797 | err = rewrite_section_headers(info, flags); |
d913188c | 3798 | if (err) |
34e1169d | 3799 | goto free_copy; |
d913188c | 3800 | |
5fdc7db6 JY |
3801 | /* Check module struct version now, before we try to use module. */ |
3802 | if (!check_modstruct_version(info, info->mod)) { | |
3803 | err = -ENOEXEC; | |
3804 | goto free_copy; | |
3805 | } | |
3806 | ||
d913188c | 3807 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3808 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3809 | if (IS_ERR(mod)) { |
3810 | err = PTR_ERR(mod); | |
d913188c | 3811 | goto free_copy; |
1da177e4 | 3812 | } |
1da177e4 | 3813 | |
ca86cad7 RGB |
3814 | audit_log_kern_module(mod->name); |
3815 | ||
a3535c7e RR |
3816 | /* Reserve our place in the list. */ |
3817 | err = add_unformed_module(mod); | |
3818 | if (err) | |
1fb9341a | 3819 | goto free_module; |
1fb9341a | 3820 | |
106a4ee2 | 3821 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3822 | mod->sig_ok = info->sig_ok; |
64748a2c | 3823 | if (!mod->sig_ok) { |
bddb12b3 | 3824 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3825 | "and/or required key missing - tainting " |
bddb12b3 | 3826 | "kernel\n", mod->name); |
66cc69e3 | 3827 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3828 | } |
106a4ee2 RR |
3829 | #endif |
3830 | ||
8d8022e8 | 3831 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3832 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3833 | if (err) |
3834 | goto unlink_mod; | |
3835 | ||
49668688 | 3836 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3837 | err = module_unload_init(mod); |
3838 | if (err) | |
1fb9341a | 3839 | goto unlink_mod; |
1da177e4 | 3840 | |
cf2fde7b | 3841 | init_param_lock(mod); |
b51d23e4 | 3842 | |
22e268eb RR |
3843 | /* Now we've got everything in the final locations, we can |
3844 | * find optional sections. */ | |
eb3057df FH |
3845 | err = find_module_sections(mod, info); |
3846 | if (err) | |
3847 | goto free_unload; | |
9b37ccfc | 3848 | |
49668688 | 3849 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3850 | if (err) |
3851 | goto free_unload; | |
9841d61d | 3852 | |
c988d2b2 | 3853 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3854 | setup_modinfo(mod, info); |
c988d2b2 | 3855 | |
1da177e4 | 3856 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3857 | err = simplify_symbols(mod, info); |
1da177e4 | 3858 | if (err < 0) |
d913188c | 3859 | goto free_modinfo; |
1da177e4 | 3860 | |
34e1169d | 3861 | err = apply_relocations(mod, info); |
22e268eb | 3862 | if (err < 0) |
d913188c | 3863 | goto free_modinfo; |
1da177e4 | 3864 | |
34e1169d | 3865 | err = post_relocation(mod, info); |
1da177e4 | 3866 | if (err < 0) |
d913188c | 3867 | goto free_modinfo; |
1da177e4 | 3868 | |
22e268eb | 3869 | flush_module_icache(mod); |
378bac82 | 3870 | |
6526c534 RR |
3871 | /* Now copy in args */ |
3872 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3873 | if (IS_ERR(mod->args)) { | |
3874 | err = PTR_ERR(mod->args); | |
3875 | goto free_arch_cleanup; | |
3876 | } | |
8d3b33f6 | 3877 | |
52796312 | 3878 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3879 | |
a949ae56 SRRH |
3880 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3881 | ftrace_module_init(mod); | |
3882 | ||
a3535c7e RR |
3883 | /* Finally it's fully formed, ready to start executing. */ |
3884 | err = complete_formation(mod, info); | |
3885 | if (err) | |
1fb9341a | 3886 | goto ddebug_cleanup; |
be593f4c | 3887 | |
4c973d16 JY |
3888 | err = prepare_coming_module(mod); |
3889 | if (err) | |
3890 | goto bug_cleanup; | |
3891 | ||
51f3d0f4 | 3892 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3893 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3894 | -32768, 32767, mod, |
ecc86170 | 3895 | unknown_module_param_cb); |
51e158c1 RR |
3896 | if (IS_ERR(after_dashes)) { |
3897 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3898 | goto coming_cleanup; |
51e158c1 RR |
3899 | } else if (after_dashes) { |
3900 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3901 | mod->name, after_dashes); | |
3902 | } | |
1da177e4 | 3903 | |
ca86cad7 | 3904 | /* Link in to sysfs. */ |
34e1169d | 3905 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3906 | if (err < 0) |
4c973d16 | 3907 | goto coming_cleanup; |
80a3d1bb | 3908 | |
1ce15ef4 JY |
3909 | if (is_livepatch_module(mod)) { |
3910 | err = copy_module_elf(mod, info); | |
3911 | if (err < 0) | |
3912 | goto sysfs_cleanup; | |
3913 | } | |
3914 | ||
48fd1188 | 3915 | /* Get rid of temporary copy. */ |
34e1169d | 3916 | free_copy(info); |
1da177e4 LT |
3917 | |
3918 | /* Done! */ | |
51f3d0f4 | 3919 | trace_module_load(mod); |
34e1169d KC |
3920 | |
3921 | return do_init_module(mod); | |
1da177e4 | 3922 | |
1ce15ef4 JY |
3923 | sysfs_cleanup: |
3924 | mod_sysfs_teardown(mod); | |
4c973d16 | 3925 | coming_cleanup: |
885a78d4 | 3926 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3927 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3928 | blocking_notifier_call_chain(&module_notify_list, |
3929 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3930 | klp_module_going(mod); |
1fb9341a RR |
3931 | bug_cleanup: |
3932 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3933 | mutex_lock(&module_mutex); |
5336377d | 3934 | module_bug_cleanup(mod); |
ee61abb3 | 3935 | mutex_unlock(&module_mutex); |
ff7e0055 | 3936 | |
a3535c7e | 3937 | ddebug_cleanup: |
1323eac7 | 3938 | ftrace_release_mod(mod); |
52796312 | 3939 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 3940 | synchronize_rcu(); |
6526c534 RR |
3941 | kfree(mod->args); |
3942 | free_arch_cleanup: | |
1da177e4 | 3943 | module_arch_cleanup(mod); |
d913188c | 3944 | free_modinfo: |
a263f776 | 3945 | free_modinfo(mod); |
22e268eb | 3946 | free_unload: |
1da177e4 | 3947 | module_unload_free(mod); |
1fb9341a RR |
3948 | unlink_mod: |
3949 | mutex_lock(&module_mutex); | |
3950 | /* Unlink carefully: kallsyms could be walking list. */ | |
3951 | list_del_rcu(&mod->list); | |
758556bd | 3952 | mod_tree_remove(mod); |
1fb9341a | 3953 | wake_up_all(&module_wq); |
0be964be | 3954 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 3955 | synchronize_rcu(); |
1fb9341a | 3956 | mutex_unlock(&module_mutex); |
d913188c | 3957 | free_module: |
35a9393c | 3958 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3959 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3960 | |
34e1169d | 3961 | module_deallocate(mod, info); |
d913188c | 3962 | free_copy: |
34e1169d KC |
3963 | free_copy(info); |
3964 | return err; | |
b99b87f7 PO |
3965 | } |
3966 | ||
17da2bd9 HC |
3967 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3968 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3969 | { |
34e1169d KC |
3970 | int err; |
3971 | struct load_info info = { }; | |
1da177e4 | 3972 | |
34e1169d KC |
3973 | err = may_init_module(); |
3974 | if (err) | |
3975 | return err; | |
1da177e4 | 3976 | |
34e1169d KC |
3977 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3978 | umod, len, uargs); | |
1da177e4 | 3979 | |
34e1169d KC |
3980 | err = copy_module_from_user(umod, len, &info); |
3981 | if (err) | |
3982 | return err; | |
1da177e4 | 3983 | |
2f3238ae | 3984 | return load_module(&info, uargs, 0); |
34e1169d | 3985 | } |
94462ad3 | 3986 | |
2f3238ae | 3987 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3988 | { |
34e1169d | 3989 | struct load_info info = { }; |
a1db7420 MZ |
3990 | loff_t size; |
3991 | void *hdr; | |
3992 | int err; | |
94462ad3 | 3993 | |
34e1169d KC |
3994 | err = may_init_module(); |
3995 | if (err) | |
3996 | return err; | |
1da177e4 | 3997 | |
2f3238ae | 3998 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3999 | |
2f3238ae RR |
4000 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
4001 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
4002 | return -EINVAL; | |
d6de2c80 | 4003 | |
a1db7420 MZ |
4004 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
4005 | READING_MODULE); | |
34e1169d KC |
4006 | if (err) |
4007 | return err; | |
a1db7420 MZ |
4008 | info.hdr = hdr; |
4009 | info.len = size; | |
1da177e4 | 4010 | |
2f3238ae | 4011 | return load_module(&info, uargs, flags); |
1da177e4 LT |
4012 | } |
4013 | ||
4014 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
4015 | { | |
4016 | return ((void *)addr >= start && (void *)addr < start + size); | |
4017 | } | |
4018 | ||
4019 | #ifdef CONFIG_KALLSYMS | |
4020 | /* | |
4021 | * This ignores the intensely annoying "mapping symbols" found | |
4022 | * in ARM ELF files: $a, $t and $d. | |
4023 | */ | |
4024 | static inline int is_arm_mapping_symbol(const char *str) | |
4025 | { | |
2e3a10a1 RK |
4026 | if (str[0] == '.' && str[1] == 'L') |
4027 | return true; | |
6c34f1f5 | 4028 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
4029 | && (str[2] == '\0' || str[2] == '.'); |
4030 | } | |
4031 | ||
2d25bc55 | 4032 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 4033 | { |
8244062e | 4034 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
4035 | } |
4036 | ||
2d25bc55 JY |
4037 | /* |
4038 | * Given a module and address, find the corresponding symbol and return its name | |
4039 | * while providing its size and offset if needed. | |
4040 | */ | |
4041 | static const char *find_kallsyms_symbol(struct module *mod, | |
4042 | unsigned long addr, | |
4043 | unsigned long *size, | |
4044 | unsigned long *offset) | |
1da177e4 LT |
4045 | { |
4046 | unsigned int i, best = 0; | |
93d77e7f | 4047 | unsigned long nextval, bestval; |
8244062e | 4048 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
4049 | |
4050 | /* At worse, next value is at end of module */ | |
a06f6211 | 4051 | if (within_module_init(addr, mod)) |
7523e4dc | 4052 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 4053 | else |
7523e4dc | 4054 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 4055 | |
93d77e7f VW |
4056 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
4057 | ||
25985edc | 4058 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 4059 | starts real symbols at 1). */ |
8244062e | 4060 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
4061 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
4062 | unsigned long thisval = kallsyms_symbol_value(sym); | |
4063 | ||
4064 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
4065 | continue; |
4066 | ||
4067 | /* We ignore unnamed symbols: they're uninformative | |
4068 | * and inserted at a whim. */ | |
2d25bc55 JY |
4069 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
4070 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
4071 | continue; |
4072 | ||
93d77e7f | 4073 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 4074 | best = i; |
93d77e7f VW |
4075 | bestval = thisval; |
4076 | } | |
4077 | if (thisval > addr && thisval < nextval) | |
4078 | nextval = thisval; | |
1da177e4 LT |
4079 | } |
4080 | ||
4081 | if (!best) | |
4082 | return NULL; | |
4083 | ||
ffb45122 | 4084 | if (size) |
93d77e7f | 4085 | *size = nextval - bestval; |
ffb45122 | 4086 | if (offset) |
93d77e7f | 4087 | *offset = addr - bestval; |
2d25bc55 JY |
4088 | |
4089 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
4090 | } |
4091 | ||
b865ea64 SS |
4092 | void * __weak dereference_module_function_descriptor(struct module *mod, |
4093 | void *ptr) | |
4094 | { | |
4095 | return ptr; | |
4096 | } | |
4097 | ||
6dd06c9f RR |
4098 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
4099 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 4100 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
4101 | unsigned long *size, |
4102 | unsigned long *offset, | |
4103 | char **modname, | |
4104 | char *namebuf) | |
1da177e4 | 4105 | { |
cb2a5205 | 4106 | const char *ret = NULL; |
b7df4d1b | 4107 | struct module *mod; |
1da177e4 | 4108 | |
cb2a5205 | 4109 | preempt_disable(); |
b7df4d1b PZ |
4110 | mod = __module_address(addr); |
4111 | if (mod) { | |
4112 | if (modname) | |
4113 | *modname = mod->name; | |
2d25bc55 JY |
4114 | |
4115 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4116 | } |
6dd06c9f RR |
4117 | /* Make a copy in here where it's safe */ |
4118 | if (ret) { | |
4119 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4120 | ret = namebuf; | |
4121 | } | |
cb2a5205 | 4122 | preempt_enable(); |
b7df4d1b | 4123 | |
92dfc9dc | 4124 | return ret; |
1da177e4 LT |
4125 | } |
4126 | ||
9d65cb4a AD |
4127 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4128 | { | |
4129 | struct module *mod; | |
4130 | ||
cb2a5205 | 4131 | preempt_disable(); |
d72b3751 | 4132 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4133 | if (mod->state == MODULE_STATE_UNFORMED) |
4134 | continue; | |
9b20a352 | 4135 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4136 | const char *sym; |
4137 | ||
2d25bc55 | 4138 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4139 | if (!sym) |
4140 | goto out; | |
2d25bc55 | 4141 | |
9281acea | 4142 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4143 | preempt_enable(); |
9d65cb4a AD |
4144 | return 0; |
4145 | } | |
4146 | } | |
4147 | out: | |
cb2a5205 | 4148 | preempt_enable(); |
9d65cb4a AD |
4149 | return -ERANGE; |
4150 | } | |
4151 | ||
a5c43dae AD |
4152 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4153 | unsigned long *offset, char *modname, char *name) | |
4154 | { | |
4155 | struct module *mod; | |
4156 | ||
cb2a5205 | 4157 | preempt_disable(); |
d72b3751 | 4158 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4159 | if (mod->state == MODULE_STATE_UNFORMED) |
4160 | continue; | |
9b20a352 | 4161 | if (within_module(addr, mod)) { |
a5c43dae AD |
4162 | const char *sym; |
4163 | ||
2d25bc55 | 4164 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4165 | if (!sym) |
4166 | goto out; | |
4167 | if (modname) | |
9281acea | 4168 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4169 | if (name) |
9281acea | 4170 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4171 | preempt_enable(); |
a5c43dae AD |
4172 | return 0; |
4173 | } | |
4174 | } | |
4175 | out: | |
cb2a5205 | 4176 | preempt_enable(); |
a5c43dae AD |
4177 | return -ERANGE; |
4178 | } | |
4179 | ||
ea07890a AD |
4180 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4181 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4182 | { |
4183 | struct module *mod; | |
4184 | ||
cb2a5205 | 4185 | preempt_disable(); |
d72b3751 | 4186 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4187 | struct mod_kallsyms *kallsyms; |
4188 | ||
0d21b0e3 RR |
4189 | if (mod->state == MODULE_STATE_UNFORMED) |
4190 | continue; | |
8244062e RR |
4191 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4192 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4193 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4194 | ||
4195 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4196 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4197 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4198 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4199 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4200 | preempt_enable(); |
ea07890a | 4201 | return 0; |
1da177e4 | 4202 | } |
8244062e | 4203 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4204 | } |
cb2a5205 | 4205 | preempt_enable(); |
ea07890a | 4206 | return -ERANGE; |
1da177e4 LT |
4207 | } |
4208 | ||
2d25bc55 JY |
4209 | /* Given a module and name of symbol, find and return the symbol's value */ |
4210 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4211 | { |
4212 | unsigned int i; | |
8244062e | 4213 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4214 | |
93d77e7f VW |
4215 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4216 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4217 | ||
2d25bc55 | 4218 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4219 | sym->st_shndx != SHN_UNDEF) |
4220 | return kallsyms_symbol_value(sym); | |
4221 | } | |
1da177e4 LT |
4222 | return 0; |
4223 | } | |
4224 | ||
4225 | /* Look for this name: can be of form module:name. */ | |
4226 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4227 | { | |
4228 | struct module *mod; | |
4229 | char *colon; | |
4230 | unsigned long ret = 0; | |
4231 | ||
4232 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4233 | preempt_disable(); |
17586188 | 4234 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4235 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4236 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4237 | } else { |
0d21b0e3 RR |
4238 | list_for_each_entry_rcu(mod, &modules, list) { |
4239 | if (mod->state == MODULE_STATE_UNFORMED) | |
4240 | continue; | |
2d25bc55 | 4241 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4242 | break; |
0d21b0e3 | 4243 | } |
1da177e4 | 4244 | } |
cb2a5205 | 4245 | preempt_enable(); |
1da177e4 LT |
4246 | return ret; |
4247 | } | |
75a66614 AK |
4248 | |
4249 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4250 | struct module *, unsigned long), | |
4251 | void *data) | |
4252 | { | |
4253 | struct module *mod; | |
4254 | unsigned int i; | |
4255 | int ret; | |
4256 | ||
0be964be PZ |
4257 | module_assert_mutex(); |
4258 | ||
75a66614 | 4259 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4260 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4261 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4262 | ||
0d21b0e3 RR |
4263 | if (mod->state == MODULE_STATE_UNFORMED) |
4264 | continue; | |
8244062e | 4265 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4266 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4267 | |
93d77e7f | 4268 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4269 | continue; |
4270 | ||
2d25bc55 | 4271 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4272 | mod, kallsyms_symbol_value(sym)); |
75a66614 AK |
4273 | if (ret != 0) |
4274 | return ret; | |
4275 | } | |
4276 | } | |
4277 | return 0; | |
4278 | } | |
1da177e4 LT |
4279 | #endif /* CONFIG_KALLSYMS */ |
4280 | ||
7fd8329b PM |
4281 | /* Maximum number of characters written by module_flags() */ |
4282 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4283 | ||
4284 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4285 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4286 | { |
4287 | int bx = 0; | |
4288 | ||
0d21b0e3 | 4289 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4290 | if (mod->taints || |
4291 | mod->state == MODULE_STATE_GOING || | |
4292 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4293 | buf[bx++] = '('; |
cca3e707 | 4294 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4295 | /* Show a - for module-is-being-unloaded */ |
4296 | if (mod->state == MODULE_STATE_GOING) | |
4297 | buf[bx++] = '-'; | |
4298 | /* Show a + for module-is-being-loaded */ | |
4299 | if (mod->state == MODULE_STATE_COMING) | |
4300 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4301 | buf[bx++] = ')'; |
4302 | } | |
4303 | buf[bx] = '\0'; | |
4304 | ||
4305 | return buf; | |
4306 | } | |
4307 | ||
3b5d5c6b AD |
4308 | #ifdef CONFIG_PROC_FS |
4309 | /* Called by the /proc file system to return a list of modules. */ | |
4310 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4311 | { | |
4312 | mutex_lock(&module_mutex); | |
4313 | return seq_list_start(&modules, *pos); | |
4314 | } | |
4315 | ||
4316 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4317 | { | |
4318 | return seq_list_next(p, &modules, pos); | |
4319 | } | |
4320 | ||
4321 | static void m_stop(struct seq_file *m, void *p) | |
4322 | { | |
4323 | mutex_unlock(&module_mutex); | |
4324 | } | |
4325 | ||
1da177e4 LT |
4326 | static int m_show(struct seq_file *m, void *p) |
4327 | { | |
4328 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4329 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4330 | void *value; |
fa3ba2e8 | 4331 | |
0d21b0e3 RR |
4332 | /* We always ignore unformed modules. */ |
4333 | if (mod->state == MODULE_STATE_UNFORMED) | |
4334 | return 0; | |
4335 | ||
2f0f2a33 | 4336 | seq_printf(m, "%s %u", |
7523e4dc | 4337 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4338 | print_unload_info(m, mod); |
4339 | ||
4340 | /* Informative for users. */ | |
4341 | seq_printf(m, " %s", | |
6da0b565 IA |
4342 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4343 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4344 | "Live"); |
4345 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4346 | value = m->private ? NULL : mod->core_layout.base; |
4347 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4348 | |
fa3ba2e8 FM |
4349 | /* Taints info */ |
4350 | if (mod->taints) | |
21aa9280 | 4351 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4352 | |
6da0b565 | 4353 | seq_puts(m, "\n"); |
1da177e4 LT |
4354 | return 0; |
4355 | } | |
4356 | ||
4357 | /* Format: modulename size refcount deps address | |
4358 | ||
4359 | Where refcount is a number or -, and deps is a comma-separated list | |
4360 | of depends or -. | |
4361 | */ | |
3b5d5c6b | 4362 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4363 | .start = m_start, |
4364 | .next = m_next, | |
4365 | .stop = m_stop, | |
4366 | .show = m_show | |
4367 | }; | |
4368 | ||
516fb7f2 LT |
4369 | /* |
4370 | * This also sets the "private" pointer to non-NULL if the | |
4371 | * kernel pointers should be hidden (so you can just test | |
4372 | * "m->private" to see if you should keep the values private). | |
4373 | * | |
4374 | * We use the same logic as for /proc/kallsyms. | |
4375 | */ | |
3b5d5c6b AD |
4376 | static int modules_open(struct inode *inode, struct file *file) |
4377 | { | |
516fb7f2 LT |
4378 | int err = seq_open(file, &modules_op); |
4379 | ||
4380 | if (!err) { | |
4381 | struct seq_file *m = file->private_data; | |
4382 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4383 | } | |
4384 | ||
3f553b30 | 4385 | return err; |
3b5d5c6b AD |
4386 | } |
4387 | ||
97a32539 | 4388 | static const struct proc_ops modules_proc_ops = { |
d919b33d | 4389 | .proc_flags = PROC_ENTRY_PERMANENT, |
97a32539 AD |
4390 | .proc_open = modules_open, |
4391 | .proc_read = seq_read, | |
4392 | .proc_lseek = seq_lseek, | |
4393 | .proc_release = seq_release, | |
3b5d5c6b AD |
4394 | }; |
4395 | ||
4396 | static int __init proc_modules_init(void) | |
4397 | { | |
97a32539 | 4398 | proc_create("modules", 0, NULL, &modules_proc_ops); |
3b5d5c6b AD |
4399 | return 0; |
4400 | } | |
4401 | module_init(proc_modules_init); | |
4402 | #endif | |
4403 | ||
1da177e4 LT |
4404 | /* Given an address, look for it in the module exception tables. */ |
4405 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4406 | { | |
1da177e4 LT |
4407 | const struct exception_table_entry *e = NULL; |
4408 | struct module *mod; | |
4409 | ||
24da1cbf | 4410 | preempt_disable(); |
5ff22646 PZ |
4411 | mod = __module_address(addr); |
4412 | if (!mod) | |
4413 | goto out; | |
22a8bdeb | 4414 | |
5ff22646 PZ |
4415 | if (!mod->num_exentries) |
4416 | goto out; | |
4417 | ||
4418 | e = search_extable(mod->extable, | |
a94c33dd | 4419 | mod->num_exentries, |
5ff22646 PZ |
4420 | addr); |
4421 | out: | |
24da1cbf | 4422 | preempt_enable(); |
1da177e4 | 4423 | |
5ff22646 PZ |
4424 | /* |
4425 | * Now, if we found one, we are running inside it now, hence | |
4426 | * we cannot unload the module, hence no refcnt needed. | |
4427 | */ | |
1da177e4 LT |
4428 | return e; |
4429 | } | |
4430 | ||
4d435f9d | 4431 | /* |
e610499e RR |
4432 | * is_module_address - is this address inside a module? |
4433 | * @addr: the address to check. | |
4434 | * | |
4435 | * See is_module_text_address() if you simply want to see if the address | |
4436 | * is code (not data). | |
4d435f9d | 4437 | */ |
e610499e | 4438 | bool is_module_address(unsigned long addr) |
4d435f9d | 4439 | { |
e610499e | 4440 | bool ret; |
4d435f9d | 4441 | |
24da1cbf | 4442 | preempt_disable(); |
e610499e | 4443 | ret = __module_address(addr) != NULL; |
24da1cbf | 4444 | preempt_enable(); |
4d435f9d | 4445 | |
e610499e | 4446 | return ret; |
4d435f9d IM |
4447 | } |
4448 | ||
e610499e RR |
4449 | /* |
4450 | * __module_address - get the module which contains an address. | |
4451 | * @addr: the address. | |
4452 | * | |
4453 | * Must be called with preempt disabled or module mutex held so that | |
4454 | * module doesn't get freed during this. | |
4455 | */ | |
714f83d5 | 4456 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4457 | { |
4458 | struct module *mod; | |
4459 | ||
3a642e99 RR |
4460 | if (addr < module_addr_min || addr > module_addr_max) |
4461 | return NULL; | |
4462 | ||
0be964be PZ |
4463 | module_assert_mutex_or_preempt(); |
4464 | ||
6c9692e2 | 4465 | mod = mod_find(addr); |
93c2e105 PZ |
4466 | if (mod) { |
4467 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4468 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4469 | mod = NULL; |
0d21b0e3 | 4470 | } |
93c2e105 | 4471 | return mod; |
1da177e4 LT |
4472 | } |
4473 | ||
e610499e RR |
4474 | /* |
4475 | * is_module_text_address - is this address inside module code? | |
4476 | * @addr: the address to check. | |
4477 | * | |
4478 | * See is_module_address() if you simply want to see if the address is | |
4479 | * anywhere in a module. See kernel_text_address() for testing if an | |
4480 | * address corresponds to kernel or module code. | |
4481 | */ | |
4482 | bool is_module_text_address(unsigned long addr) | |
4483 | { | |
4484 | bool ret; | |
4485 | ||
4486 | preempt_disable(); | |
4487 | ret = __module_text_address(addr) != NULL; | |
4488 | preempt_enable(); | |
4489 | ||
4490 | return ret; | |
4491 | } | |
4492 | ||
4493 | /* | |
4494 | * __module_text_address - get the module whose code contains an address. | |
4495 | * @addr: the address. | |
4496 | * | |
4497 | * Must be called with preempt disabled or module mutex held so that | |
4498 | * module doesn't get freed during this. | |
4499 | */ | |
4500 | struct module *__module_text_address(unsigned long addr) | |
4501 | { | |
4502 | struct module *mod = __module_address(addr); | |
4503 | if (mod) { | |
4504 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4505 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4506 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4507 | mod = NULL; |
4508 | } | |
4509 | return mod; | |
4510 | } | |
4511 | ||
1da177e4 LT |
4512 | /* Don't grab lock, we're oopsing. */ |
4513 | void print_modules(void) | |
4514 | { | |
4515 | struct module *mod; | |
7fd8329b | 4516 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4517 | |
b231125a | 4518 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4519 | /* Most callers should already have preempt disabled, but make sure */ |
4520 | preempt_disable(); | |
0d21b0e3 RR |
4521 | list_for_each_entry_rcu(mod, &modules, list) { |
4522 | if (mod->state == MODULE_STATE_UNFORMED) | |
4523 | continue; | |
27bba4d6 | 4524 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4525 | } |
d72b3751 | 4526 | preempt_enable(); |
e14af7ee | 4527 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4528 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4529 | pr_cont("\n"); | |
1da177e4 LT |
4530 | } |
4531 | ||
1da177e4 | 4532 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4533 | /* Generate the signature for all relevant module structures here. |
4534 | * If these change, we don't want to try to parse the module. */ | |
4535 | void module_layout(struct module *mod, | |
4536 | struct modversion_info *ver, | |
4537 | struct kernel_param *kp, | |
4538 | struct kernel_symbol *ks, | |
65498646 | 4539 | struct tracepoint * const *tp) |
8c8ef42a RR |
4540 | { |
4541 | } | |
4542 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4543 | #endif |