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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f71d20e9 | 2 | /* |
1da177e4 | 3 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 4 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 | 5 | |
1da177e4 | 6 | */ |
51161bfc LR |
7 | |
8 | #define INCLUDE_VERMAGIC | |
9 | ||
9984de1a | 10 | #include <linux/export.h> |
8a293be0 | 11 | #include <linux/extable.h> |
1da177e4 | 12 | #include <linux/moduleloader.h> |
c8424e77 | 13 | #include <linux/module_signature.h> |
af658dca | 14 | #include <linux/trace_events.h> |
1da177e4 | 15 | #include <linux/init.h> |
ae84e324 | 16 | #include <linux/kallsyms.h> |
34e1169d | 17 | #include <linux/file.h> |
3b5d5c6b | 18 | #include <linux/fs.h> |
6d760133 | 19 | #include <linux/sysfs.h> |
9f158333 | 20 | #include <linux/kernel.h> |
1da177e4 LT |
21 | #include <linux/slab.h> |
22 | #include <linux/vmalloc.h> | |
23 | #include <linux/elf.h> | |
3b5d5c6b | 24 | #include <linux/proc_fs.h> |
2e72d51b | 25 | #include <linux/security.h> |
1da177e4 LT |
26 | #include <linux/seq_file.h> |
27 | #include <linux/syscalls.h> | |
28 | #include <linux/fcntl.h> | |
29 | #include <linux/rcupdate.h> | |
c59ede7b | 30 | #include <linux/capability.h> |
1da177e4 LT |
31 | #include <linux/cpu.h> |
32 | #include <linux/moduleparam.h> | |
33 | #include <linux/errno.h> | |
34 | #include <linux/err.h> | |
35 | #include <linux/vermagic.h> | |
36 | #include <linux/notifier.h> | |
f6a57033 | 37 | #include <linux/sched.h> |
1da177e4 | 38 | #include <linux/device.h> |
c988d2b2 | 39 | #include <linux/string.h> |
97d1f15b | 40 | #include <linux/mutex.h> |
d72b3751 | 41 | #include <linux/rculist.h> |
7c0f6ba6 | 42 | #include <linux/uaccess.h> |
1da177e4 | 43 | #include <asm/cacheflush.h> |
563ec5cb | 44 | #include <linux/set_memory.h> |
eb8cdec4 | 45 | #include <asm/mmu_context.h> |
b817f6fe | 46 | #include <linux/license.h> |
6d762394 | 47 | #include <asm/sections.h> |
97e1c18e | 48 | #include <linux/tracepoint.h> |
90d595fe | 49 | #include <linux/ftrace.h> |
7e545d6e | 50 | #include <linux/livepatch.h> |
22a9d645 | 51 | #include <linux/async.h> |
fbf59bc9 | 52 | #include <linux/percpu.h> |
4f2294b6 | 53 | #include <linux/kmemleak.h> |
bf5438fc | 54 | #include <linux/jump_label.h> |
84e1c6bb | 55 | #include <linux/pfn.h> |
403ed278 | 56 | #include <linux/bsearch.h> |
9d5059c9 | 57 | #include <linux/dynamic_debug.h> |
ca86cad7 | 58 | #include <linux/audit.h> |
2f3238ae | 59 | #include <uapi/linux/module.h> |
106a4ee2 | 60 | #include "module-internal.h" |
1da177e4 | 61 | |
7ead8b83 LZ |
62 | #define CREATE_TRACE_POINTS |
63 | #include <trace/events/module.h> | |
64 | ||
1da177e4 LT |
65 | #ifndef ARCH_SHF_SMALL |
66 | #define ARCH_SHF_SMALL 0 | |
67 | #endif | |
68 | ||
84e1c6bb MC |
69 | /* |
70 | * Modules' sections will be aligned on page boundaries | |
3b5be16c HZ |
71 | * to ensure complete separation of code and data, but |
72 | * only when CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y | |
84e1c6bb | 73 | */ |
3b5be16c | 74 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb | 75 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
3b5be16c HZ |
76 | #else |
77 | # define debug_align(X) (X) | |
78 | #endif | |
84e1c6bb | 79 | |
1da177e4 LT |
80 | /* If this is set, the section belongs in the init part of the module */ |
81 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
82 | ||
75676500 RR |
83 | /* |
84 | * Mutex protects: | |
85 | * 1) List of modules (also safely readable with preempt_disable), | |
86 | * 2) module_use links, | |
87 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 88 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
89 | DEFINE_MUTEX(module_mutex); |
90 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 91 | static LIST_HEAD(modules); |
67fc4e0c | 92 | |
1a7b7d92 RE |
93 | /* Work queue for freeing init sections in success case */ |
94 | static struct work_struct init_free_wq; | |
95 | static struct llist_head init_free_list; | |
96 | ||
6c9692e2 | 97 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 98 | |
93c2e105 PZ |
99 | /* |
100 | * Use a latched RB-tree for __module_address(); this allows us to use | |
101 | * RCU-sched lookups of the address from any context. | |
102 | * | |
6c9692e2 PZ |
103 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
104 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
105 | * NMI context. | |
93c2e105 PZ |
106 | */ |
107 | ||
108 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 109 | { |
7523e4dc | 110 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 111 | |
7523e4dc | 112 | return (unsigned long)layout->base; |
93c2e105 PZ |
113 | } |
114 | ||
115 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
116 | { | |
7523e4dc | 117 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 118 | |
7523e4dc | 119 | return (unsigned long)layout->size; |
93c2e105 PZ |
120 | } |
121 | ||
122 | static __always_inline bool | |
123 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
124 | { | |
125 | return __mod_tree_val(a) < __mod_tree_val(b); | |
126 | } | |
127 | ||
128 | static __always_inline int | |
129 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
130 | { | |
131 | unsigned long val = (unsigned long)key; | |
132 | unsigned long start, end; | |
133 | ||
134 | start = __mod_tree_val(n); | |
135 | if (val < start) | |
136 | return -1; | |
137 | ||
138 | end = start + __mod_tree_size(n); | |
139 | if (val >= end) | |
140 | return 1; | |
106a4ee2 | 141 | |
106a4ee2 RR |
142 | return 0; |
143 | } | |
144 | ||
93c2e105 PZ |
145 | static const struct latch_tree_ops mod_tree_ops = { |
146 | .less = mod_tree_less, | |
147 | .comp = mod_tree_comp, | |
148 | }; | |
149 | ||
4f666546 PZ |
150 | static struct mod_tree_root { |
151 | struct latch_tree_root root; | |
152 | unsigned long addr_min; | |
153 | unsigned long addr_max; | |
154 | } mod_tree __cacheline_aligned = { | |
155 | .addr_min = -1UL, | |
106a4ee2 | 156 | }; |
106a4ee2 | 157 | |
4f666546 PZ |
158 | #define module_addr_min mod_tree.addr_min |
159 | #define module_addr_max mod_tree.addr_max | |
160 | ||
161 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
162 | { | |
163 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
164 | } | |
165 | ||
166 | static void __mod_tree_remove(struct mod_tree_node *node) | |
167 | { | |
168 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
169 | } | |
93c2e105 PZ |
170 | |
171 | /* | |
172 | * These modifications: insert, remove_init and remove; are serialized by the | |
173 | * module_mutex. | |
174 | */ | |
175 | static void mod_tree_insert(struct module *mod) | |
176 | { | |
7523e4dc RR |
177 | mod->core_layout.mtn.mod = mod; |
178 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 179 | |
7523e4dc RR |
180 | __mod_tree_insert(&mod->core_layout.mtn); |
181 | if (mod->init_layout.size) | |
182 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
183 | } |
184 | ||
185 | static void mod_tree_remove_init(struct module *mod) | |
186 | { | |
7523e4dc RR |
187 | if (mod->init_layout.size) |
188 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
189 | } |
190 | ||
191 | static void mod_tree_remove(struct module *mod) | |
192 | { | |
7523e4dc | 193 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
194 | mod_tree_remove_init(mod); |
195 | } | |
196 | ||
6c9692e2 | 197 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
198 | { |
199 | struct latch_tree_node *ltn; | |
200 | ||
4f666546 | 201 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
202 | if (!ltn) |
203 | return NULL; | |
204 | ||
205 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
206 | } | |
207 | ||
6c9692e2 PZ |
208 | #else /* MODULES_TREE_LOOKUP */ |
209 | ||
4f666546 PZ |
210 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
211 | ||
6c9692e2 PZ |
212 | static void mod_tree_insert(struct module *mod) { } |
213 | static void mod_tree_remove_init(struct module *mod) { } | |
214 | static void mod_tree_remove(struct module *mod) { } | |
215 | ||
216 | static struct module *mod_find(unsigned long addr) | |
217 | { | |
218 | struct module *mod; | |
219 | ||
bf08949c MH |
220 | list_for_each_entry_rcu(mod, &modules, list, |
221 | lockdep_is_held(&module_mutex)) { | |
6c9692e2 PZ |
222 | if (within_module(addr, mod)) |
223 | return mod; | |
224 | } | |
225 | ||
226 | return NULL; | |
227 | } | |
228 | ||
229 | #endif /* MODULES_TREE_LOOKUP */ | |
230 | ||
4f666546 PZ |
231 | /* |
232 | * Bounds of module text, for speeding up __module_address. | |
233 | * Protected by module_mutex. | |
234 | */ | |
235 | static void __mod_update_bounds(void *base, unsigned int size) | |
236 | { | |
237 | unsigned long min = (unsigned long)base; | |
238 | unsigned long max = min + size; | |
239 | ||
240 | if (min < module_addr_min) | |
241 | module_addr_min = min; | |
242 | if (max > module_addr_max) | |
243 | module_addr_max = max; | |
244 | } | |
245 | ||
246 | static void mod_update_bounds(struct module *mod) | |
247 | { | |
7523e4dc RR |
248 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
249 | if (mod->init_layout.size) | |
250 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
251 | } |
252 | ||
67fc4e0c JW |
253 | #ifdef CONFIG_KGDB_KDB |
254 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
255 | #endif /* CONFIG_KGDB_KDB */ | |
256 | ||
0be964be PZ |
257 | static void module_assert_mutex(void) |
258 | { | |
259 | lockdep_assert_held(&module_mutex); | |
260 | } | |
261 | ||
262 | static void module_assert_mutex_or_preempt(void) | |
263 | { | |
264 | #ifdef CONFIG_LOCKDEP | |
265 | if (unlikely(!debug_locks)) | |
266 | return; | |
267 | ||
9502514f | 268 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
269 | !lockdep_is_held(&module_mutex)); |
270 | #endif | |
271 | } | |
272 | ||
6727bb9c | 273 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 274 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 275 | |
fda784e5 BM |
276 | /* |
277 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
278 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
279 | */ | |
280 | bool is_module_sig_enforced(void) | |
281 | { | |
282 | return sig_enforce; | |
283 | } | |
284 | EXPORT_SYMBOL(is_module_sig_enforced); | |
285 | ||
8db5da0b MZ |
286 | void set_module_sig_enforced(void) |
287 | { | |
288 | sig_enforce = true; | |
289 | } | |
290 | ||
19e4529e SR |
291 | /* Block module loading/unloading? */ |
292 | int modules_disabled = 0; | |
02608bef | 293 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 294 | |
c9a3ba55 RR |
295 | /* Waiting for a module to finish initializing? */ |
296 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
297 | ||
e041c683 | 298 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 299 | |
6da0b565 | 300 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 301 | { |
e041c683 | 302 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
303 | } |
304 | EXPORT_SYMBOL(register_module_notifier); | |
305 | ||
6da0b565 | 306 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 307 | { |
e041c683 | 308 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
309 | } |
310 | EXPORT_SYMBOL(unregister_module_notifier); | |
311 | ||
71d9f507 MB |
312 | /* |
313 | * We require a truly strong try_module_get(): 0 means success. | |
314 | * Otherwise an error is returned due to ongoing or failed | |
315 | * initialization etc. | |
316 | */ | |
1da177e4 LT |
317 | static inline int strong_try_module_get(struct module *mod) |
318 | { | |
0d21b0e3 | 319 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 320 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
321 | return -EBUSY; |
322 | if (try_module_get(mod)) | |
1da177e4 | 323 | return 0; |
c9a3ba55 RR |
324 | else |
325 | return -ENOENT; | |
1da177e4 LT |
326 | } |
327 | ||
373d4d09 RR |
328 | static inline void add_taint_module(struct module *mod, unsigned flag, |
329 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 330 | { |
373d4d09 | 331 | add_taint(flag, lockdep_ok); |
7fd8329b | 332 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
333 | } |
334 | ||
02a3e59a RD |
335 | /* |
336 | * A thread that wants to hold a reference to a module only while it | |
337 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 338 | */ |
bf262dce | 339 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
340 | { |
341 | module_put(mod); | |
342 | do_exit(code); | |
343 | } | |
344 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 345 | |
1da177e4 | 346 | /* Find a module section: 0 means not found. */ |
49668688 | 347 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
348 | { |
349 | unsigned int i; | |
350 | ||
49668688 RR |
351 | for (i = 1; i < info->hdr->e_shnum; i++) { |
352 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 353 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
354 | if ((shdr->sh_flags & SHF_ALLOC) |
355 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 356 | return i; |
49668688 | 357 | } |
1da177e4 LT |
358 | return 0; |
359 | } | |
360 | ||
5e458cc0 | 361 | /* Find a module section, or NULL. */ |
49668688 | 362 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
363 | { |
364 | /* Section 0 has sh_addr 0. */ | |
49668688 | 365 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
366 | } |
367 | ||
368 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 369 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
370 | const char *name, |
371 | size_t object_size, | |
372 | unsigned int *num) | |
373 | { | |
49668688 | 374 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
375 | |
376 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
377 | *num = info->sechdrs[sec].sh_size / object_size; |
378 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
379 | } |
380 | ||
1da177e4 LT |
381 | /* Provided by the linker */ |
382 | extern const struct kernel_symbol __start___ksymtab[]; | |
383 | extern const struct kernel_symbol __stop___ksymtab[]; | |
384 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
385 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
386 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
387 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
388 | extern const s32 __start___kcrctab[]; |
389 | extern const s32 __start___kcrctab_gpl[]; | |
390 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
391 | #ifdef CONFIG_UNUSED_SYMBOLS |
392 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
393 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
394 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
395 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
396 | extern const s32 __start___kcrctab_unused[]; |
397 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 398 | #endif |
1da177e4 LT |
399 | |
400 | #ifndef CONFIG_MODVERSIONS | |
401 | #define symversion(base, idx) NULL | |
402 | #else | |
f83ca9fe | 403 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
404 | #endif |
405 | ||
dafd0940 RR |
406 | static bool each_symbol_in_section(const struct symsearch *arr, |
407 | unsigned int arrsize, | |
408 | struct module *owner, | |
409 | bool (*fn)(const struct symsearch *syms, | |
410 | struct module *owner, | |
de4d8d53 | 411 | void *data), |
dafd0940 | 412 | void *data) |
ad9546c9 | 413 | { |
de4d8d53 | 414 | unsigned int j; |
ad9546c9 | 415 | |
dafd0940 | 416 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
417 | if (fn(&arr[j], owner, data)) |
418 | return true; | |
f71d20e9 | 419 | } |
dafd0940 RR |
420 | |
421 | return false; | |
ad9546c9 RR |
422 | } |
423 | ||
dafd0940 | 424 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
425 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
426 | struct module *owner, | |
427 | void *data), | |
428 | void *data) | |
ad9546c9 RR |
429 | { |
430 | struct module *mod; | |
44032e63 | 431 | static const struct symsearch arr[] = { |
ad9546c9 | 432 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 433 | NOT_GPL_ONLY, false }, |
ad9546c9 | 434 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
435 | __start___kcrctab_gpl, |
436 | GPL_ONLY, false }, | |
ad9546c9 | 437 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
438 | __start___kcrctab_gpl_future, |
439 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 440 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 441 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
442 | __start___kcrctab_unused, |
443 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 444 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
445 | __start___kcrctab_unused_gpl, |
446 | GPL_ONLY, true }, | |
f7f5b675 | 447 | #endif |
ad9546c9 | 448 | }; |
f71d20e9 | 449 | |
0be964be PZ |
450 | module_assert_mutex_or_preempt(); |
451 | ||
dafd0940 RR |
452 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
453 | return true; | |
f71d20e9 | 454 | |
bf08949c MH |
455 | list_for_each_entry_rcu(mod, &modules, list, |
456 | lockdep_is_held(&module_mutex)) { | |
ad9546c9 RR |
457 | struct symsearch arr[] = { |
458 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 459 | NOT_GPL_ONLY, false }, |
ad9546c9 | 460 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
461 | mod->gpl_crcs, |
462 | GPL_ONLY, false }, | |
ad9546c9 RR |
463 | { mod->gpl_future_syms, |
464 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
465 | mod->gpl_future_crcs, |
466 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 467 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
468 | { mod->unused_syms, |
469 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
470 | mod->unused_crcs, |
471 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
472 | { mod->unused_gpl_syms, |
473 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
474 | mod->unused_gpl_crcs, |
475 | GPL_ONLY, true }, | |
f7f5b675 | 476 | #endif |
ad9546c9 RR |
477 | }; |
478 | ||
0d21b0e3 RR |
479 | if (mod->state == MODULE_STATE_UNFORMED) |
480 | continue; | |
481 | ||
dafd0940 RR |
482 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
483 | return true; | |
484 | } | |
485 | return false; | |
486 | } | |
de4d8d53 | 487 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
488 | |
489 | struct find_symbol_arg { | |
490 | /* Input */ | |
491 | const char *name; | |
492 | bool gplok; | |
493 | bool warn; | |
494 | ||
495 | /* Output */ | |
496 | struct module *owner; | |
71810db2 | 497 | const s32 *crc; |
414fd31b | 498 | const struct kernel_symbol *sym; |
dafd0940 RR |
499 | }; |
500 | ||
2d25bc55 JY |
501 | static bool check_exported_symbol(const struct symsearch *syms, |
502 | struct module *owner, | |
503 | unsigned int symnum, void *data) | |
dafd0940 RR |
504 | { |
505 | struct find_symbol_arg *fsa = data; | |
506 | ||
dafd0940 RR |
507 | if (!fsa->gplok) { |
508 | if (syms->licence == GPL_ONLY) | |
509 | return false; | |
510 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
511 | pr_warn("Symbol %s is being used by a non-GPL module, " |
512 | "which will not be allowed in the future\n", | |
513 | fsa->name); | |
9f28bb7e | 514 | } |
1da177e4 | 515 | } |
ad9546c9 | 516 | |
f7f5b675 | 517 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 518 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
519 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
520 | "using it.\n", fsa->name); | |
521 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
522 | pr_warn("Please evaluate if this is the right api to use and " |
523 | "if it really is, submit a report to the linux kernel " | |
524 | "mailing list together with submitting your code for " | |
bddb12b3 | 525 | "inclusion.\n"); |
dafd0940 | 526 | } |
f7f5b675 | 527 | #endif |
dafd0940 RR |
528 | |
529 | fsa->owner = owner; | |
530 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 531 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
532 | return true; |
533 | } | |
534 | ||
7290d580 AB |
535 | static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
536 | { | |
537 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
538 | return (unsigned long)offset_to_ptr(&sym->value_offset); | |
539 | #else | |
540 | return sym->value; | |
541 | #endif | |
542 | } | |
543 | ||
544 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) | |
545 | { | |
546 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
547 | return offset_to_ptr(&sym->name_offset); | |
548 | #else | |
549 | return sym->name; | |
550 | #endif | |
551 | } | |
552 | ||
8651ec01 MM |
553 | static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
554 | { | |
555 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
069e1c07 WD |
556 | if (!sym->namespace_offset) |
557 | return NULL; | |
8651ec01 MM |
558 | return offset_to_ptr(&sym->namespace_offset); |
559 | #else | |
560 | return sym->namespace; | |
561 | #endif | |
562 | } | |
563 | ||
b605be65 | 564 | static int cmp_name(const void *name, const void *sym) |
403ed278 | 565 | { |
b605be65 | 566 | return strcmp(name, kernel_symbol_name(sym)); |
403ed278 AIB |
567 | } |
568 | ||
2d25bc55 JY |
569 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
570 | struct module *owner, | |
571 | void *data) | |
de4d8d53 RR |
572 | { |
573 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
574 | struct kernel_symbol *sym; |
575 | ||
576 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
577 | sizeof(struct kernel_symbol), cmp_name); | |
578 | ||
2d25bc55 JY |
579 | if (sym != NULL && check_exported_symbol(syms, owner, |
580 | sym - syms->start, data)) | |
403ed278 | 581 | return true; |
de4d8d53 | 582 | |
de4d8d53 RR |
583 | return false; |
584 | } | |
585 | ||
2d25bc55 | 586 | /* Find an exported symbol and return it, along with, (optional) crc and |
75676500 | 587 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
588 | const struct kernel_symbol *find_symbol(const char *name, |
589 | struct module **owner, | |
71810db2 | 590 | const s32 **crc, |
c6b37801 TA |
591 | bool gplok, |
592 | bool warn) | |
dafd0940 RR |
593 | { |
594 | struct find_symbol_arg fsa; | |
595 | ||
596 | fsa.name = name; | |
597 | fsa.gplok = gplok; | |
598 | fsa.warn = warn; | |
599 | ||
2d25bc55 | 600 | if (each_symbol_section(find_exported_symbol_in_section, &fsa)) { |
dafd0940 RR |
601 | if (owner) |
602 | *owner = fsa.owner; | |
603 | if (crc) | |
604 | *crc = fsa.crc; | |
414fd31b | 605 | return fsa.sym; |
dafd0940 RR |
606 | } |
607 | ||
5e124169 | 608 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 609 | return NULL; |
1da177e4 | 610 | } |
c6b37801 | 611 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 612 | |
fe0d34d2 RR |
613 | /* |
614 | * Search for module by name: must hold module_mutex (or preempt disabled | |
615 | * for read-only access). | |
616 | */ | |
4f6de4d5 | 617 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 618 | bool even_unformed) |
1da177e4 LT |
619 | { |
620 | struct module *mod; | |
621 | ||
fe0d34d2 | 622 | module_assert_mutex_or_preempt(); |
0be964be | 623 | |
bf08949c MH |
624 | list_for_each_entry_rcu(mod, &modules, list, |
625 | lockdep_is_held(&module_mutex)) { | |
0d21b0e3 RR |
626 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
627 | continue; | |
4f6de4d5 | 628 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
629 | return mod; |
630 | } | |
631 | return NULL; | |
632 | } | |
0d21b0e3 RR |
633 | |
634 | struct module *find_module(const char *name) | |
635 | { | |
fe0d34d2 | 636 | module_assert_mutex(); |
4f6de4d5 | 637 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 638 | } |
c6b37801 | 639 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
640 | |
641 | #ifdef CONFIG_SMP | |
fbf59bc9 | 642 | |
259354de | 643 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 644 | { |
259354de TH |
645 | return mod->percpu; |
646 | } | |
fbf59bc9 | 647 | |
9eb76d77 | 648 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 649 | { |
9eb76d77 RR |
650 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
651 | unsigned long align = pcpusec->sh_addralign; | |
652 | ||
653 | if (!pcpusec->sh_size) | |
654 | return 0; | |
655 | ||
fbf59bc9 | 656 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
657 | pr_warn("%s: per-cpu alignment %li > %li\n", |
658 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
659 | align = PAGE_SIZE; |
660 | } | |
661 | ||
9eb76d77 | 662 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 663 | if (!mod->percpu) { |
bddb12b3 AM |
664 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
665 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
666 | return -ENOMEM; |
667 | } | |
9eb76d77 | 668 | mod->percpu_size = pcpusec->sh_size; |
259354de | 669 | return 0; |
fbf59bc9 TH |
670 | } |
671 | ||
259354de | 672 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 673 | { |
259354de | 674 | free_percpu(mod->percpu); |
fbf59bc9 TH |
675 | } |
676 | ||
49668688 | 677 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 678 | { |
49668688 | 679 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
680 | } |
681 | ||
259354de TH |
682 | static void percpu_modcopy(struct module *mod, |
683 | const void *from, unsigned long size) | |
6b588c18 TH |
684 | { |
685 | int cpu; | |
686 | ||
687 | for_each_possible_cpu(cpu) | |
259354de | 688 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
689 | } |
690 | ||
383776fa | 691 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
692 | { |
693 | struct module *mod; | |
694 | unsigned int cpu; | |
695 | ||
696 | preempt_disable(); | |
697 | ||
698 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
699 | if (mod->state == MODULE_STATE_UNFORMED) |
700 | continue; | |
10fad5e4 TH |
701 | if (!mod->percpu_size) |
702 | continue; | |
703 | for_each_possible_cpu(cpu) { | |
704 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 705 | void *va = (void *)addr; |
10fad5e4 | 706 | |
383776fa | 707 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 708 | if (can_addr) { |
383776fa | 709 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
710 | *can_addr += (unsigned long) |
711 | per_cpu_ptr(mod->percpu, | |
712 | get_boot_cpu_id()); | |
713 | } | |
10fad5e4 TH |
714 | preempt_enable(); |
715 | return true; | |
716 | } | |
717 | } | |
718 | } | |
719 | ||
720 | preempt_enable(); | |
721 | return false; | |
6b588c18 TH |
722 | } |
723 | ||
383776fa TG |
724 | /** |
725 | * is_module_percpu_address - test whether address is from module static percpu | |
726 | * @addr: address to test | |
727 | * | |
728 | * Test whether @addr belongs to module static percpu area. | |
729 | * | |
730 | * RETURNS: | |
731 | * %true if @addr is from module static percpu area | |
732 | */ | |
733 | bool is_module_percpu_address(unsigned long addr) | |
734 | { | |
735 | return __is_module_percpu_address(addr, NULL); | |
736 | } | |
737 | ||
1da177e4 | 738 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 739 | |
259354de | 740 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
741 | { |
742 | return NULL; | |
743 | } | |
9eb76d77 | 744 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 745 | { |
9eb76d77 RR |
746 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
747 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
748 | return -ENOMEM; | |
749 | return 0; | |
259354de TH |
750 | } |
751 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 752 | { |
1da177e4 | 753 | } |
49668688 | 754 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
755 | { |
756 | return 0; | |
757 | } | |
259354de TH |
758 | static inline void percpu_modcopy(struct module *mod, |
759 | const void *from, unsigned long size) | |
1da177e4 LT |
760 | { |
761 | /* pcpusec should be 0, and size of that section should be 0. */ | |
762 | BUG_ON(size != 0); | |
763 | } | |
10fad5e4 TH |
764 | bool is_module_percpu_address(unsigned long addr) |
765 | { | |
766 | return false; | |
767 | } | |
6b588c18 | 768 | |
383776fa TG |
769 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
770 | { | |
771 | return false; | |
772 | } | |
773 | ||
1da177e4 LT |
774 | #endif /* CONFIG_SMP */ |
775 | ||
c988d2b2 MD |
776 | #define MODINFO_ATTR(field) \ |
777 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
778 | { \ | |
779 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
780 | } \ | |
781 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 782 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 783 | { \ |
cc56ded3 | 784 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
785 | } \ |
786 | static int modinfo_##field##_exists(struct module *mod) \ | |
787 | { \ | |
788 | return mod->field != NULL; \ | |
789 | } \ | |
790 | static void free_modinfo_##field(struct module *mod) \ | |
791 | { \ | |
22a8bdeb DW |
792 | kfree(mod->field); \ |
793 | mod->field = NULL; \ | |
c988d2b2 MD |
794 | } \ |
795 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 796 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
797 | .show = show_modinfo_##field, \ |
798 | .setup = setup_modinfo_##field, \ | |
799 | .test = modinfo_##field##_exists, \ | |
800 | .free = free_modinfo_##field, \ | |
801 | }; | |
802 | ||
803 | MODINFO_ATTR(version); | |
804 | MODINFO_ATTR(srcversion); | |
805 | ||
e14af7ee AV |
806 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
807 | ||
03e88ae1 | 808 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
809 | |
810 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
811 | ||
e513cc1c MH |
812 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
813 | #define MODULE_REF_BASE 1 | |
814 | ||
1da177e4 | 815 | /* Init the unload section of the module. */ |
9f85a4bb | 816 | static int module_unload_init(struct module *mod) |
1da177e4 | 817 | { |
e513cc1c MH |
818 | /* |
819 | * Initialize reference counter to MODULE_REF_BASE. | |
820 | * refcnt == 0 means module is going. | |
821 | */ | |
822 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 823 | |
2c02dfe7 LT |
824 | INIT_LIST_HEAD(&mod->source_list); |
825 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 826 | |
1da177e4 | 827 | /* Hold reference count during initialization. */ |
e513cc1c | 828 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
829 | |
830 | return 0; | |
1da177e4 LT |
831 | } |
832 | ||
1da177e4 LT |
833 | /* Does a already use b? */ |
834 | static int already_uses(struct module *a, struct module *b) | |
835 | { | |
836 | struct module_use *use; | |
837 | ||
2c02dfe7 LT |
838 | list_for_each_entry(use, &b->source_list, source_list) { |
839 | if (use->source == a) { | |
5e124169 | 840 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
841 | return 1; |
842 | } | |
843 | } | |
5e124169 | 844 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
845 | return 0; |
846 | } | |
847 | ||
2c02dfe7 LT |
848 | /* |
849 | * Module a uses b | |
850 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
851 | * - the module_use is added to the list of 'b' sources (so | |
852 | * 'b' can walk the list to see who sourced them), and of 'a' | |
853 | * targets (so 'a' can see what modules it targets). | |
854 | */ | |
855 | static int add_module_usage(struct module *a, struct module *b) | |
856 | { | |
2c02dfe7 LT |
857 | struct module_use *use; |
858 | ||
5e124169 | 859 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 860 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 861 | if (!use) |
2c02dfe7 | 862 | return -ENOMEM; |
2c02dfe7 LT |
863 | |
864 | use->source = a; | |
865 | use->target = b; | |
866 | list_add(&use->source_list, &b->source_list); | |
867 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
868 | return 0; |
869 | } | |
870 | ||
75676500 | 871 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 872 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 873 | { |
c8e21ced | 874 | int err; |
270a6c4c | 875 | |
9bea7f23 | 876 | if (b == NULL || already_uses(a, b)) |
218ce735 | 877 | return 0; |
218ce735 | 878 | |
9bea7f23 RR |
879 | /* If module isn't available, we fail. */ |
880 | err = strong_try_module_get(b); | |
c9a3ba55 | 881 | if (err) |
9bea7f23 | 882 | return err; |
1da177e4 | 883 | |
2c02dfe7 LT |
884 | err = add_module_usage(a, b); |
885 | if (err) { | |
1da177e4 | 886 | module_put(b); |
9bea7f23 | 887 | return err; |
1da177e4 | 888 | } |
9bea7f23 | 889 | return 0; |
1da177e4 | 890 | } |
9bea7f23 | 891 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
892 | |
893 | /* Clear the unload stuff of the module. */ | |
894 | static void module_unload_free(struct module *mod) | |
895 | { | |
2c02dfe7 | 896 | struct module_use *use, *tmp; |
1da177e4 | 897 | |
75676500 | 898 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
899 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
900 | struct module *i = use->target; | |
5e124169 | 901 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
902 | module_put(i); |
903 | list_del(&use->source_list); | |
904 | list_del(&use->target_list); | |
905 | kfree(use); | |
1da177e4 | 906 | } |
75676500 | 907 | mutex_unlock(&module_mutex); |
1da177e4 LT |
908 | } |
909 | ||
910 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 911 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
912 | { |
913 | int ret = (flags & O_TRUNC); | |
914 | if (ret) | |
373d4d09 | 915 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
916 | return ret; |
917 | } | |
918 | #else | |
fb169793 | 919 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
920 | { |
921 | return 0; | |
922 | } | |
923 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
924 | ||
e513cc1c MH |
925 | /* Try to release refcount of module, 0 means success. */ |
926 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 927 | { |
e513cc1c | 928 | int ret; |
1da177e4 | 929 | |
e513cc1c MH |
930 | /* Try to decrement refcnt which we set at loading */ |
931 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
932 | BUG_ON(ret < 0); | |
933 | if (ret) | |
934 | /* Someone can put this right now, recover with checking */ | |
935 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 936 | |
e513cc1c MH |
937 | return ret; |
938 | } | |
1da177e4 | 939 | |
e513cc1c MH |
940 | static int try_stop_module(struct module *mod, int flags, int *forced) |
941 | { | |
da39ba5e | 942 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
943 | if (try_release_module_ref(mod) != 0) { |
944 | *forced = try_force_unload(flags); | |
945 | if (!(*forced)) | |
1da177e4 LT |
946 | return -EWOULDBLOCK; |
947 | } | |
948 | ||
949 | /* Mark it as dying. */ | |
e513cc1c | 950 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 951 | |
e513cc1c | 952 | return 0; |
1da177e4 LT |
953 | } |
954 | ||
d5db139a RR |
955 | /** |
956 | * module_refcount - return the refcount or -1 if unloading | |
957 | * | |
958 | * @mod: the module we're checking | |
959 | * | |
960 | * Returns: | |
961 | * -1 if the module is in the process of unloading | |
962 | * otherwise the number of references in the kernel to the module | |
963 | */ | |
964 | int module_refcount(struct module *mod) | |
1da177e4 | 965 | { |
d5db139a | 966 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
967 | } |
968 | EXPORT_SYMBOL(module_refcount); | |
969 | ||
970 | /* This exists whether we can unload or not */ | |
971 | static void free_module(struct module *mod); | |
972 | ||
17da2bd9 HC |
973 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
974 | unsigned int, flags) | |
1da177e4 LT |
975 | { |
976 | struct module *mod; | |
dfff0a06 | 977 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
978 | int ret, forced = 0; |
979 | ||
3d43321b | 980 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
981 | return -EPERM; |
982 | ||
983 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
984 | return -EFAULT; | |
985 | name[MODULE_NAME_LEN-1] = '\0'; | |
986 | ||
f6276ac9 RGB |
987 | audit_log_kern_module(name); |
988 | ||
3fc1f1e2 TH |
989 | if (mutex_lock_interruptible(&module_mutex) != 0) |
990 | return -EINTR; | |
1da177e4 LT |
991 | |
992 | mod = find_module(name); | |
993 | if (!mod) { | |
994 | ret = -ENOENT; | |
995 | goto out; | |
996 | } | |
997 | ||
2c02dfe7 | 998 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
999 | /* Other modules depend on us: get rid of them first. */ |
1000 | ret = -EWOULDBLOCK; | |
1001 | goto out; | |
1002 | } | |
1003 | ||
1004 | /* Doing init or already dying? */ | |
1005 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 1006 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 1007 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
1008 | ret = -EBUSY; |
1009 | goto out; | |
1010 | } | |
1011 | ||
1012 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 1013 | if (mod->init && !mod->exit) { |
fb169793 | 1014 | forced = try_force_unload(flags); |
1da177e4 LT |
1015 | if (!forced) { |
1016 | /* This module can't be removed */ | |
1017 | ret = -EBUSY; | |
1018 | goto out; | |
1019 | } | |
1020 | } | |
1021 | ||
1da177e4 LT |
1022 | /* Stop the machine so refcounts can't move and disable module. */ |
1023 | ret = try_stop_module(mod, flags, &forced); | |
1024 | if (ret != 0) | |
1025 | goto out; | |
1026 | ||
df4b565e | 1027 | mutex_unlock(&module_mutex); |
25985edc | 1028 | /* Final destruction now no one is using it. */ |
df4b565e | 1029 | if (mod->exit != NULL) |
1da177e4 | 1030 | mod->exit(); |
df4b565e PO |
1031 | blocking_notifier_call_chain(&module_notify_list, |
1032 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1033 | klp_module_going(mod); |
7dcd182b JY |
1034 | ftrace_release_mod(mod); |
1035 | ||
22a9d645 | 1036 | async_synchronize_full(); |
75676500 | 1037 | |
e14af7ee | 1038 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1039 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1040 | |
75676500 | 1041 | free_module(mod); |
5d603311 KK |
1042 | /* someone could wait for the module in add_unformed_module() */ |
1043 | wake_up_all(&module_wq); | |
75676500 RR |
1044 | return 0; |
1045 | out: | |
6389a385 | 1046 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1047 | return ret; |
1048 | } | |
1049 | ||
d1e99d7a | 1050 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1051 | { |
1052 | struct module_use *use; | |
1053 | int printed_something = 0; | |
1054 | ||
d5db139a | 1055 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1056 | |
6da0b565 IA |
1057 | /* |
1058 | * Always include a trailing , so userspace can differentiate | |
1059 | * between this and the old multi-field proc format. | |
1060 | */ | |
2c02dfe7 | 1061 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1062 | printed_something = 1; |
2c02dfe7 | 1063 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1064 | } |
1065 | ||
1da177e4 LT |
1066 | if (mod->init != NULL && mod->exit == NULL) { |
1067 | printed_something = 1; | |
6da0b565 | 1068 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1069 | } |
1070 | ||
1071 | if (!printed_something) | |
6da0b565 | 1072 | seq_puts(m, "-"); |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | void __symbol_put(const char *symbol) | |
1076 | { | |
1077 | struct module *owner; | |
1da177e4 | 1078 | |
24da1cbf | 1079 | preempt_disable(); |
414fd31b | 1080 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1081 | BUG(); |
1082 | module_put(owner); | |
24da1cbf | 1083 | preempt_enable(); |
1da177e4 LT |
1084 | } |
1085 | EXPORT_SYMBOL(__symbol_put); | |
1086 | ||
7d1d16e4 | 1087 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1088 | void symbol_put_addr(void *addr) |
1089 | { | |
5e376613 | 1090 | struct module *modaddr; |
7d1d16e4 | 1091 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1092 | |
7d1d16e4 | 1093 | if (core_kernel_text(a)) |
5e376613 | 1094 | return; |
1da177e4 | 1095 | |
275d7d44 PZ |
1096 | /* |
1097 | * Even though we hold a reference on the module; we still need to | |
1098 | * disable preemption in order to safely traverse the data structure. | |
1099 | */ | |
1100 | preempt_disable(); | |
7d1d16e4 | 1101 | modaddr = __module_text_address(a); |
a6e6abd5 | 1102 | BUG_ON(!modaddr); |
5e376613 | 1103 | module_put(modaddr); |
275d7d44 | 1104 | preempt_enable(); |
1da177e4 LT |
1105 | } |
1106 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1107 | ||
1108 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1109 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1110 | { |
d5db139a | 1111 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1112 | } |
1113 | ||
cca3e707 KS |
1114 | static struct module_attribute modinfo_refcnt = |
1115 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1116 | |
d53799be SR |
1117 | void __module_get(struct module *module) |
1118 | { | |
1119 | if (module) { | |
1120 | preempt_disable(); | |
2f35c41f | 1121 | atomic_inc(&module->refcnt); |
d53799be SR |
1122 | trace_module_get(module, _RET_IP_); |
1123 | preempt_enable(); | |
1124 | } | |
1125 | } | |
1126 | EXPORT_SYMBOL(__module_get); | |
1127 | ||
1128 | bool try_module_get(struct module *module) | |
1129 | { | |
1130 | bool ret = true; | |
1131 | ||
1132 | if (module) { | |
1133 | preempt_disable(); | |
e513cc1c MH |
1134 | /* Note: here, we can fail to get a reference */ |
1135 | if (likely(module_is_live(module) && | |
1136 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1137 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1138 | else |
d53799be SR |
1139 | ret = false; |
1140 | ||
1141 | preempt_enable(); | |
1142 | } | |
1143 | return ret; | |
1144 | } | |
1145 | EXPORT_SYMBOL(try_module_get); | |
1146 | ||
f6a57033 AV |
1147 | void module_put(struct module *module) |
1148 | { | |
e513cc1c MH |
1149 | int ret; |
1150 | ||
f6a57033 | 1151 | if (module) { |
e1783a24 | 1152 | preempt_disable(); |
e513cc1c MH |
1153 | ret = atomic_dec_if_positive(&module->refcnt); |
1154 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1155 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1156 | preempt_enable(); |
f6a57033 AV |
1157 | } |
1158 | } | |
1159 | EXPORT_SYMBOL(module_put); | |
1160 | ||
1da177e4 | 1161 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1162 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1163 | { |
1164 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1165 | seq_puts(m, " - -"); |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | static inline void module_unload_free(struct module *mod) | |
1169 | { | |
1170 | } | |
1171 | ||
9bea7f23 | 1172 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1173 | { |
9bea7f23 | 1174 | return strong_try_module_get(b); |
1da177e4 | 1175 | } |
9bea7f23 | 1176 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1177 | |
9f85a4bb | 1178 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1179 | { |
9f85a4bb | 1180 | return 0; |
1da177e4 LT |
1181 | } |
1182 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1183 | ||
53999bf3 KW |
1184 | static size_t module_flags_taint(struct module *mod, char *buf) |
1185 | { | |
1186 | size_t l = 0; | |
7fd8329b PM |
1187 | int i; |
1188 | ||
1189 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1190 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1191 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1192 | } |
53999bf3 | 1193 | |
53999bf3 KW |
1194 | return l; |
1195 | } | |
1196 | ||
1f71740a | 1197 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1198 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1199 | { |
1200 | const char *state = "unknown"; | |
1201 | ||
4befb026 | 1202 | switch (mk->mod->state) { |
1f71740a KS |
1203 | case MODULE_STATE_LIVE: |
1204 | state = "live"; | |
1205 | break; | |
1206 | case MODULE_STATE_COMING: | |
1207 | state = "coming"; | |
1208 | break; | |
1209 | case MODULE_STATE_GOING: | |
1210 | state = "going"; | |
1211 | break; | |
0d21b0e3 RR |
1212 | default: |
1213 | BUG(); | |
1f71740a KS |
1214 | } |
1215 | return sprintf(buffer, "%s\n", state); | |
1216 | } | |
1217 | ||
cca3e707 KS |
1218 | static struct module_attribute modinfo_initstate = |
1219 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1220 | |
88bfa324 KS |
1221 | static ssize_t store_uevent(struct module_attribute *mattr, |
1222 | struct module_kobject *mk, | |
1223 | const char *buffer, size_t count) | |
1224 | { | |
df44b479 PR |
1225 | int rc; |
1226 | ||
1227 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1228 | return rc ? rc : count; | |
88bfa324 KS |
1229 | } |
1230 | ||
cca3e707 KS |
1231 | struct module_attribute module_uevent = |
1232 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1233 | ||
1234 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1235 | struct module_kobject *mk, char *buffer) | |
1236 | { | |
7523e4dc | 1237 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1238 | } |
1239 | ||
1240 | static struct module_attribute modinfo_coresize = | |
1241 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1242 | ||
1243 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1244 | struct module_kobject *mk, char *buffer) | |
1245 | { | |
7523e4dc | 1246 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1247 | } |
1248 | ||
1249 | static struct module_attribute modinfo_initsize = | |
1250 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1251 | ||
1252 | static ssize_t show_taint(struct module_attribute *mattr, | |
1253 | struct module_kobject *mk, char *buffer) | |
1254 | { | |
1255 | size_t l; | |
1256 | ||
1257 | l = module_flags_taint(mk->mod, buffer); | |
1258 | buffer[l++] = '\n'; | |
1259 | return l; | |
1260 | } | |
1261 | ||
1262 | static struct module_attribute modinfo_taint = | |
1263 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1264 | |
03e88ae1 | 1265 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1266 | &module_uevent, |
03e88ae1 GKH |
1267 | &modinfo_version, |
1268 | &modinfo_srcversion, | |
cca3e707 KS |
1269 | &modinfo_initstate, |
1270 | &modinfo_coresize, | |
1271 | &modinfo_initsize, | |
1272 | &modinfo_taint, | |
03e88ae1 | 1273 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1274 | &modinfo_refcnt, |
03e88ae1 GKH |
1275 | #endif |
1276 | NULL, | |
1277 | }; | |
1278 | ||
1da177e4 LT |
1279 | static const char vermagic[] = VERMAGIC_STRING; |
1280 | ||
c6e665c8 | 1281 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1282 | { |
1283 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1284 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1285 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1286 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1287 | return 0; |
1288 | #else | |
1289 | return -ENOEXEC; | |
1290 | #endif | |
1291 | } | |
1292 | ||
1da177e4 | 1293 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1294 | |
1295 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1296 | { |
71810db2 | 1297 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1298 | } |
1299 | ||
49019426 | 1300 | static int check_version(const struct load_info *info, |
1da177e4 | 1301 | const char *symname, |
6da0b565 | 1302 | struct module *mod, |
71810db2 | 1303 | const s32 *crc) |
1da177e4 | 1304 | { |
49019426 KC |
1305 | Elf_Shdr *sechdrs = info->sechdrs; |
1306 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1307 | unsigned int i, num_versions; |
1308 | struct modversion_info *versions; | |
1309 | ||
1310 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1311 | if (!crc) | |
1312 | return 1; | |
1313 | ||
a5dd6970 RR |
1314 | /* No versions at all? modprobe --force does this. */ |
1315 | if (versindex == 0) | |
1316 | return try_to_force_load(mod, symname) == 0; | |
1317 | ||
1da177e4 LT |
1318 | versions = (void *) sechdrs[versindex].sh_addr; |
1319 | num_versions = sechdrs[versindex].sh_size | |
1320 | / sizeof(struct modversion_info); | |
1321 | ||
1322 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1323 | u32 crcval; |
1324 | ||
1da177e4 LT |
1325 | if (strcmp(versions[i].name, symname) != 0) |
1326 | continue; | |
1327 | ||
71810db2 AB |
1328 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1329 | crcval = resolve_rel_crc(crc); | |
1330 | else | |
1331 | crcval = *crc; | |
1332 | if (versions[i].crc == crcval) | |
1da177e4 | 1333 | return 1; |
71810db2 AB |
1334 | pr_debug("Found checksum %X vs module %lX\n", |
1335 | crcval, versions[i].crc); | |
826e4506 | 1336 | goto bad_version; |
1da177e4 | 1337 | } |
826e4506 | 1338 | |
faaae2a5 | 1339 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1340 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1341 | return 1; |
826e4506 LT |
1342 | |
1343 | bad_version: | |
6da0b565 | 1344 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1345 | info->name, symname); |
826e4506 | 1346 | return 0; |
1da177e4 LT |
1347 | } |
1348 | ||
49019426 | 1349 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1350 | struct module *mod) |
1351 | { | |
71810db2 | 1352 | const s32 *crc; |
1da177e4 | 1353 | |
926a59b1 PZ |
1354 | /* |
1355 | * Since this should be found in kernel (which can't be removed), no | |
1356 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1357 | */ | |
1358 | preempt_disable(); | |
996302c5 | 1359 | if (!find_symbol("module_layout", NULL, &crc, true, false)) { |
926a59b1 | 1360 | preempt_enable(); |
1da177e4 | 1361 | BUG(); |
926a59b1 PZ |
1362 | } |
1363 | preempt_enable(); | |
996302c5 | 1364 | return check_version(info, "module_layout", mod, crc); |
1da177e4 LT |
1365 | } |
1366 | ||
91e37a79 RR |
1367 | /* First part is kernel version, which we ignore if module has crcs. */ |
1368 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1369 | bool has_crcs) | |
1da177e4 | 1370 | { |
91e37a79 RR |
1371 | if (has_crcs) { |
1372 | amagic += strcspn(amagic, " "); | |
1373 | bmagic += strcspn(bmagic, " "); | |
1374 | } | |
1da177e4 LT |
1375 | return strcmp(amagic, bmagic) == 0; |
1376 | } | |
1377 | #else | |
49019426 | 1378 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1379 | const char *symname, |
6da0b565 | 1380 | struct module *mod, |
71810db2 | 1381 | const s32 *crc) |
1da177e4 LT |
1382 | { |
1383 | return 1; | |
1384 | } | |
1385 | ||
49019426 | 1386 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1387 | struct module *mod) |
1388 | { | |
1389 | return 1; | |
1390 | } | |
1391 | ||
91e37a79 RR |
1392 | static inline int same_magic(const char *amagic, const char *bmagic, |
1393 | bool has_crcs) | |
1da177e4 LT |
1394 | { |
1395 | return strcmp(amagic, bmagic) == 0; | |
1396 | } | |
1397 | #endif /* CONFIG_MODVERSIONS */ | |
1398 | ||
8651ec01 MM |
1399 | static char *get_modinfo(const struct load_info *info, const char *tag); |
1400 | static char *get_next_modinfo(const struct load_info *info, const char *tag, | |
1401 | char *prev); | |
1402 | ||
1403 | static int verify_namespace_is_imported(const struct load_info *info, | |
1404 | const struct kernel_symbol *sym, | |
1405 | struct module *mod) | |
1406 | { | |
1407 | const char *namespace; | |
1408 | char *imported_namespace; | |
1409 | ||
1410 | namespace = kernel_symbol_namespace(sym); | |
c3a6cf19 | 1411 | if (namespace && namespace[0]) { |
8651ec01 MM |
1412 | imported_namespace = get_modinfo(info, "import_ns"); |
1413 | while (imported_namespace) { | |
1414 | if (strcmp(namespace, imported_namespace) == 0) | |
1415 | return 0; | |
1416 | imported_namespace = get_next_modinfo( | |
1417 | info, "import_ns", imported_namespace); | |
1418 | } | |
3d52ec5e MM |
1419 | #ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
1420 | pr_warn( | |
1421 | #else | |
1422 | pr_err( | |
1423 | #endif | |
1424 | "%s: module uses symbol (%s) from namespace %s, but does not import it.\n", | |
1425 | mod->name, kernel_symbol_name(sym), namespace); | |
1426 | #ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS | |
8651ec01 | 1427 | return -EINVAL; |
3d52ec5e | 1428 | #endif |
8651ec01 MM |
1429 | } |
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | ||
75676500 | 1434 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1435 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1436 | const struct load_info *info, | |
414fd31b | 1437 | const char *name, |
9bea7f23 | 1438 | char ownername[]) |
1da177e4 LT |
1439 | { |
1440 | struct module *owner; | |
414fd31b | 1441 | const struct kernel_symbol *sym; |
71810db2 | 1442 | const s32 *crc; |
9bea7f23 | 1443 | int err; |
1da177e4 | 1444 | |
d64810f5 PZ |
1445 | /* |
1446 | * The module_mutex should not be a heavily contended lock; | |
1447 | * if we get the occasional sleep here, we'll go an extra iteration | |
1448 | * in the wait_event_interruptible(), which is harmless. | |
1449 | */ | |
1450 | sched_annotate_sleep(); | |
75676500 | 1451 | mutex_lock(&module_mutex); |
414fd31b | 1452 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1453 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1454 | if (!sym) |
1455 | goto unlock; | |
1456 | ||
49019426 | 1457 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1458 | sym = ERR_PTR(-EINVAL); |
1459 | goto getname; | |
1da177e4 | 1460 | } |
9bea7f23 | 1461 | |
8651ec01 MM |
1462 | err = verify_namespace_is_imported(info, sym, mod); |
1463 | if (err) { | |
1464 | sym = ERR_PTR(err); | |
1465 | goto getname; | |
1466 | } | |
1467 | ||
9bea7f23 RR |
1468 | err = ref_module(mod, owner); |
1469 | if (err) { | |
1470 | sym = ERR_PTR(err); | |
1471 | goto getname; | |
1472 | } | |
1473 | ||
1474 | getname: | |
1475 | /* We must make copy under the lock if we failed to get ref. */ | |
1476 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1477 | unlock: | |
75676500 | 1478 | mutex_unlock(&module_mutex); |
218ce735 | 1479 | return sym; |
1da177e4 LT |
1480 | } |
1481 | ||
49668688 RR |
1482 | static const struct kernel_symbol * |
1483 | resolve_symbol_wait(struct module *mod, | |
1484 | const struct load_info *info, | |
1485 | const char *name) | |
9bea7f23 RR |
1486 | { |
1487 | const struct kernel_symbol *ksym; | |
49668688 | 1488 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1489 | |
1490 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1491 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1492 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1493 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1494 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1495 | mod->name, owner); | |
9bea7f23 RR |
1496 | } |
1497 | return ksym; | |
1498 | } | |
1499 | ||
1da177e4 LT |
1500 | /* |
1501 | * /sys/module/foo/sections stuff | |
1502 | * J. Corbet <corbet@lwn.net> | |
1503 | */ | |
8f6d0378 | 1504 | #ifdef CONFIG_SYSFS |
10b465aa | 1505 | |
8f6d0378 | 1506 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1507 | static inline bool sect_empty(const Elf_Shdr *sect) |
1508 | { | |
1509 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1510 | } | |
1511 | ||
6da0b565 | 1512 | struct module_sect_attr { |
a58730c4 RR |
1513 | struct module_attribute mattr; |
1514 | char *name; | |
1515 | unsigned long address; | |
1516 | }; | |
1517 | ||
6da0b565 | 1518 | struct module_sect_attrs { |
a58730c4 RR |
1519 | struct attribute_group grp; |
1520 | unsigned int nsections; | |
0f742266 | 1521 | struct module_sect_attr attrs[]; |
a58730c4 RR |
1522 | }; |
1523 | ||
1da177e4 | 1524 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1525 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1526 | { |
1527 | struct module_sect_attr *sattr = | |
1528 | container_of(mattr, struct module_sect_attr, mattr); | |
be71eda5 TR |
1529 | return sprintf(buf, "0x%px\n", kptr_restrict < 2 ? |
1530 | (void *)sattr->address : NULL); | |
1da177e4 LT |
1531 | } |
1532 | ||
04b1db9f IN |
1533 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1534 | { | |
a58730c4 | 1535 | unsigned int section; |
04b1db9f IN |
1536 | |
1537 | for (section = 0; section < sect_attrs->nsections; section++) | |
1538 | kfree(sect_attrs->attrs[section].name); | |
1539 | kfree(sect_attrs); | |
1540 | } | |
1541 | ||
8f6d0378 | 1542 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1543 | { |
1544 | unsigned int nloaded = 0, i, size[2]; | |
1545 | struct module_sect_attrs *sect_attrs; | |
1546 | struct module_sect_attr *sattr; | |
1547 | struct attribute **gattr; | |
22a8bdeb | 1548 | |
1da177e4 | 1549 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1550 | for (i = 0; i < info->hdr->e_shnum; i++) |
1551 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 | 1552 | nloaded++; |
8d1b73dd | 1553 | size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
1da177e4 LT |
1554 | sizeof(sect_attrs->grp.attrs[0])); |
1555 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1556 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1557 | if (sect_attrs == NULL) | |
1da177e4 LT |
1558 | return; |
1559 | ||
1560 | /* Setup section attributes. */ | |
1561 | sect_attrs->grp.name = "sections"; | |
1562 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1563 | ||
04b1db9f | 1564 | sect_attrs->nsections = 0; |
1da177e4 LT |
1565 | sattr = §_attrs->attrs[0]; |
1566 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1567 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1568 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1569 | if (sect_empty(sec)) | |
35dead42 | 1570 | continue; |
8f6d0378 RR |
1571 | sattr->address = sec->sh_addr; |
1572 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1573 | GFP_KERNEL); |
1574 | if (sattr->name == NULL) | |
1575 | goto out; | |
1576 | sect_attrs->nsections++; | |
361795b1 | 1577 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1578 | sattr->mattr.show = module_sect_show; |
1579 | sattr->mattr.store = NULL; | |
1580 | sattr->mattr.attr.name = sattr->name; | |
277642dc | 1581 | sattr->mattr.attr.mode = S_IRUSR; |
1da177e4 LT |
1582 | *(gattr++) = &(sattr++)->mattr.attr; |
1583 | } | |
1584 | *gattr = NULL; | |
1585 | ||
1586 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1587 | goto out; | |
1588 | ||
1589 | mod->sect_attrs = sect_attrs; | |
1590 | return; | |
1591 | out: | |
04b1db9f | 1592 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1593 | } |
1594 | ||
1595 | static void remove_sect_attrs(struct module *mod) | |
1596 | { | |
1597 | if (mod->sect_attrs) { | |
1598 | sysfs_remove_group(&mod->mkobj.kobj, | |
1599 | &mod->sect_attrs->grp); | |
1600 | /* We are positive that no one is using any sect attrs | |
1601 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1602 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1603 | mod->sect_attrs = NULL; |
1604 | } | |
1605 | } | |
1606 | ||
6d760133 RM |
1607 | /* |
1608 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1609 | */ | |
1610 | ||
1611 | struct module_notes_attrs { | |
1612 | struct kobject *dir; | |
1613 | unsigned int notes; | |
0f742266 | 1614 | struct bin_attribute attrs[]; |
6d760133 RM |
1615 | }; |
1616 | ||
2c3c8bea | 1617 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1618 | struct bin_attribute *bin_attr, |
1619 | char *buf, loff_t pos, size_t count) | |
1620 | { | |
1621 | /* | |
1622 | * The caller checked the pos and count against our size. | |
1623 | */ | |
1624 | memcpy(buf, bin_attr->private + pos, count); | |
1625 | return count; | |
1626 | } | |
1627 | ||
1628 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1629 | unsigned int i) | |
1630 | { | |
1631 | if (notes_attrs->dir) { | |
1632 | while (i-- > 0) | |
1633 | sysfs_remove_bin_file(notes_attrs->dir, | |
1634 | ¬es_attrs->attrs[i]); | |
e9432093 | 1635 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1636 | } |
1637 | kfree(notes_attrs); | |
1638 | } | |
1639 | ||
8f6d0378 | 1640 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1641 | { |
1642 | unsigned int notes, loaded, i; | |
1643 | struct module_notes_attrs *notes_attrs; | |
1644 | struct bin_attribute *nattr; | |
1645 | ||
ea6bff36 IM |
1646 | /* failed to create section attributes, so can't create notes */ |
1647 | if (!mod->sect_attrs) | |
1648 | return; | |
1649 | ||
6d760133 RM |
1650 | /* Count notes sections and allocate structures. */ |
1651 | notes = 0; | |
8f6d0378 RR |
1652 | for (i = 0; i < info->hdr->e_shnum; i++) |
1653 | if (!sect_empty(&info->sechdrs[i]) && | |
1654 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1655 | ++notes; |
1656 | ||
1657 | if (notes == 0) | |
1658 | return; | |
1659 | ||
acafe7e3 | 1660 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1661 | GFP_KERNEL); |
1662 | if (notes_attrs == NULL) | |
1663 | return; | |
1664 | ||
1665 | notes_attrs->notes = notes; | |
1666 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1667 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1668 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1669 | continue; |
8f6d0378 | 1670 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1671 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1672 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1673 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1674 | nattr->size = info->sechdrs[i].sh_size; |
1675 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1676 | nattr->read = module_notes_read; |
1677 | ++nattr; | |
1678 | } | |
1679 | ++loaded; | |
1680 | } | |
1681 | ||
4ff6abff | 1682 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1683 | if (!notes_attrs->dir) |
1684 | goto out; | |
1685 | ||
1686 | for (i = 0; i < notes; ++i) | |
1687 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1688 | ¬es_attrs->attrs[i])) | |
1689 | goto out; | |
1690 | ||
1691 | mod->notes_attrs = notes_attrs; | |
1692 | return; | |
1693 | ||
1694 | out: | |
1695 | free_notes_attrs(notes_attrs, i); | |
1696 | } | |
1697 | ||
1698 | static void remove_notes_attrs(struct module *mod) | |
1699 | { | |
1700 | if (mod->notes_attrs) | |
1701 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1702 | } | |
1703 | ||
1da177e4 | 1704 | #else |
04b1db9f | 1705 | |
8f6d0378 RR |
1706 | static inline void add_sect_attrs(struct module *mod, |
1707 | const struct load_info *info) | |
1da177e4 LT |
1708 | { |
1709 | } | |
1710 | ||
1711 | static inline void remove_sect_attrs(struct module *mod) | |
1712 | { | |
1713 | } | |
6d760133 | 1714 | |
8f6d0378 RR |
1715 | static inline void add_notes_attrs(struct module *mod, |
1716 | const struct load_info *info) | |
6d760133 RM |
1717 | { |
1718 | } | |
1719 | ||
1720 | static inline void remove_notes_attrs(struct module *mod) | |
1721 | { | |
1722 | } | |
8f6d0378 | 1723 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1724 | |
1ba5c08b | 1725 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1726 | { |
1727 | #ifdef CONFIG_MODULE_UNLOAD | |
1728 | struct module_use *use; | |
80a3d1bb | 1729 | |
75676500 | 1730 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1731 | list_for_each_entry(use, &mod->target_list, target_list) |
1732 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1733 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1734 | #endif |
1735 | } | |
1736 | ||
1ba5c08b | 1737 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1738 | { |
1ba5c08b | 1739 | int ret = 0; |
80a3d1bb RR |
1740 | #ifdef CONFIG_MODULE_UNLOAD |
1741 | struct module_use *use; | |
1742 | ||
75676500 | 1743 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1744 | list_for_each_entry(use, &mod->target_list, target_list) { |
1745 | ret = sysfs_create_link(use->target->holders_dir, | |
1746 | &mod->mkobj.kobj, mod->name); | |
1747 | if (ret) | |
1748 | break; | |
1749 | } | |
75676500 | 1750 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1751 | if (ret) |
1752 | del_usage_links(mod); | |
80a3d1bb | 1753 | #endif |
1ba5c08b | 1754 | return ret; |
80a3d1bb RR |
1755 | } |
1756 | ||
bc6f2a75 Y |
1757 | static void module_remove_modinfo_attrs(struct module *mod, int end); |
1758 | ||
6407ebb2 | 1759 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1760 | { |
1761 | struct module_attribute *attr; | |
03e88ae1 | 1762 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1763 | int error = 0; |
1764 | int i; | |
1765 | ||
03e88ae1 GKH |
1766 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1767 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1768 | GFP_KERNEL); | |
1769 | if (!mod->modinfo_attrs) | |
1770 | return -ENOMEM; | |
1771 | ||
1772 | temp_attr = mod->modinfo_attrs; | |
bc6f2a75 | 1773 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
c75b590d | 1774 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1775 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1776 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1777 | error = sysfs_create_file(&mod->mkobj.kobj, |
1778 | &temp_attr->attr); | |
bc6f2a75 Y |
1779 | if (error) |
1780 | goto error_out; | |
03e88ae1 GKH |
1781 | ++temp_attr; |
1782 | } | |
c988d2b2 | 1783 | } |
bc6f2a75 Y |
1784 | |
1785 | return 0; | |
1786 | ||
1787 | error_out: | |
1788 | if (i > 0) | |
1789 | module_remove_modinfo_attrs(mod, --i); | |
f6d061d6 Y |
1790 | else |
1791 | kfree(mod->modinfo_attrs); | |
c988d2b2 MD |
1792 | return error; |
1793 | } | |
1794 | ||
bc6f2a75 | 1795 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
c988d2b2 MD |
1796 | { |
1797 | struct module_attribute *attr; | |
1798 | int i; | |
1799 | ||
03e88ae1 | 1800 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
bc6f2a75 Y |
1801 | if (end >= 0 && i > end) |
1802 | break; | |
03e88ae1 GKH |
1803 | /* pick a field to test for end of list */ |
1804 | if (!attr->attr.name) | |
1805 | break; | |
6da0b565 | 1806 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1807 | if (attr->free) |
1808 | attr->free(mod); | |
c988d2b2 | 1809 | } |
03e88ae1 | 1810 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1811 | } |
1da177e4 | 1812 | |
942e4431 LZ |
1813 | static void mod_kobject_put(struct module *mod) |
1814 | { | |
1815 | DECLARE_COMPLETION_ONSTACK(c); | |
1816 | mod->mkobj.kobj_completion = &c; | |
1817 | kobject_put(&mod->mkobj.kobj); | |
1818 | wait_for_completion(&c); | |
1819 | } | |
1820 | ||
6407ebb2 | 1821 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1822 | { |
1823 | int err; | |
6494a93d | 1824 | struct kobject *kobj; |
1da177e4 | 1825 | |
823bccfc | 1826 | if (!module_sysfs_initialized) { |
bddb12b3 | 1827 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1828 | err = -EINVAL; |
1829 | goto out; | |
1830 | } | |
6494a93d GKH |
1831 | |
1832 | kobj = kset_find_obj(module_kset, mod->name); | |
1833 | if (kobj) { | |
bddb12b3 | 1834 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1835 | kobject_put(kobj); |
1836 | err = -EINVAL; | |
1837 | goto out; | |
1838 | } | |
1839 | ||
1da177e4 | 1840 | mod->mkobj.mod = mod; |
e17e0f51 | 1841 | |
ac3c8141 GKH |
1842 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1843 | mod->mkobj.kobj.kset = module_kset; | |
1844 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1845 | "%s", mod->name); | |
1846 | if (err) | |
942e4431 | 1847 | mod_kobject_put(mod); |
270a6c4c | 1848 | |
97c146ef | 1849 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1850 | out: |
1851 | return err; | |
1852 | } | |
1853 | ||
6407ebb2 | 1854 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1855 | const struct load_info *info, |
270a6c4c KS |
1856 | struct kernel_param *kparam, |
1857 | unsigned int num_params) | |
1858 | { | |
1859 | int err; | |
1860 | ||
80a3d1bb RR |
1861 | err = mod_sysfs_init(mod); |
1862 | if (err) | |
1863 | goto out; | |
1864 | ||
4ff6abff | 1865 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1866 | if (!mod->holders_dir) { |
1867 | err = -ENOMEM; | |
270a6c4c | 1868 | goto out_unreg; |
240936e1 | 1869 | } |
270a6c4c | 1870 | |
1da177e4 LT |
1871 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1872 | if (err) | |
270a6c4c | 1873 | goto out_unreg_holders; |
1da177e4 | 1874 | |
c988d2b2 MD |
1875 | err = module_add_modinfo_attrs(mod); |
1876 | if (err) | |
e17e0f51 | 1877 | goto out_unreg_param; |
c988d2b2 | 1878 | |
1ba5c08b CL |
1879 | err = add_usage_links(mod); |
1880 | if (err) | |
1881 | goto out_unreg_modinfo_attrs; | |
1882 | ||
8f6d0378 RR |
1883 | add_sect_attrs(mod, info); |
1884 | add_notes_attrs(mod, info); | |
80a3d1bb | 1885 | |
e17e0f51 | 1886 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1887 | return 0; |
1888 | ||
1ba5c08b | 1889 | out_unreg_modinfo_attrs: |
bc6f2a75 | 1890 | module_remove_modinfo_attrs(mod, -1); |
e17e0f51 KS |
1891 | out_unreg_param: |
1892 | module_param_sysfs_remove(mod); | |
270a6c4c | 1893 | out_unreg_holders: |
78a2d906 | 1894 | kobject_put(mod->holders_dir); |
270a6c4c | 1895 | out_unreg: |
942e4431 | 1896 | mod_kobject_put(mod); |
80a3d1bb | 1897 | out: |
1da177e4 LT |
1898 | return err; |
1899 | } | |
34e4e2fe DL |
1900 | |
1901 | static void mod_sysfs_fini(struct module *mod) | |
1902 | { | |
8f6d0378 RR |
1903 | remove_notes_attrs(mod); |
1904 | remove_sect_attrs(mod); | |
942e4431 | 1905 | mod_kobject_put(mod); |
34e4e2fe DL |
1906 | } |
1907 | ||
cf2fde7b RR |
1908 | static void init_param_lock(struct module *mod) |
1909 | { | |
1910 | mutex_init(&mod->param_lock); | |
1911 | } | |
8f6d0378 | 1912 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1913 | |
8f6d0378 RR |
1914 | static int mod_sysfs_setup(struct module *mod, |
1915 | const struct load_info *info, | |
6407ebb2 RR |
1916 | struct kernel_param *kparam, |
1917 | unsigned int num_params) | |
1918 | { | |
1919 | return 0; | |
1920 | } | |
1921 | ||
34e4e2fe DL |
1922 | static void mod_sysfs_fini(struct module *mod) |
1923 | { | |
1924 | } | |
1925 | ||
bc6f2a75 | 1926 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
36b0360d RR |
1927 | { |
1928 | } | |
1929 | ||
80a3d1bb RR |
1930 | static void del_usage_links(struct module *mod) |
1931 | { | |
1932 | } | |
1933 | ||
cf2fde7b RR |
1934 | static void init_param_lock(struct module *mod) |
1935 | { | |
1936 | } | |
34e4e2fe | 1937 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1938 | |
36b0360d | 1939 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1940 | { |
80a3d1bb | 1941 | del_usage_links(mod); |
bc6f2a75 | 1942 | module_remove_modinfo_attrs(mod, -1); |
1da177e4 | 1943 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1944 | kobject_put(mod->mkobj.drivers_dir); |
1945 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1946 | mod_sysfs_fini(mod); |
1da177e4 LT |
1947 | } |
1948 | ||
93651f80 | 1949 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
84e1c6bb MC |
1950 | /* |
1951 | * LKM RO/NX protection: protect module's text/ro-data | |
1952 | * from modification and any data from execution. | |
85c898db RR |
1953 | * |
1954 | * General layout of module is: | |
444d13ff JY |
1955 | * [text] [read-only-data] [ro-after-init] [writable data] |
1956 | * text_size -----^ ^ ^ ^ | |
1957 | * ro_size ------------------------| | | | |
1958 | * ro_after_init_size -----------------------------| | | |
1959 | * size -----------------------------------------------------------| | |
85c898db RR |
1960 | * |
1961 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1962 | */ |
85c898db RR |
1963 | static void frob_text(const struct module_layout *layout, |
1964 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1965 | { |
85c898db RR |
1966 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1967 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1968 | set_memory((unsigned long)layout->base, | |
1969 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1970 | } |
84e1c6bb | 1971 | |
93651f80 | 1972 | #ifdef CONFIG_STRICT_MODULE_RWX |
85c898db RR |
1973 | static void frob_rodata(const struct module_layout *layout, |
1974 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1975 | { |
85c898db RR |
1976 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1977 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1978 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1979 | set_memory((unsigned long)layout->base + layout->text_size, | |
1980 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1981 | } |
1982 | ||
444d13ff JY |
1983 | static void frob_ro_after_init(const struct module_layout *layout, |
1984 | int (*set_memory)(unsigned long start, int num_pages)) | |
1985 | { | |
1986 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1987 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1988 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1989 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1990 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1991 | } | |
1992 | ||
85c898db RR |
1993 | static void frob_writable_data(const struct module_layout *layout, |
1994 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1995 | { |
85c898db | 1996 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1997 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1998 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1999 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
2000 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 2001 | } |
84e1c6bb | 2002 | |
85c898db RR |
2003 | /* livepatching wants to disable read-only so it can frob module. */ |
2004 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 2005 | { |
39290b38 AT |
2006 | if (!rodata_enabled) |
2007 | return; | |
2008 | ||
85c898db RR |
2009 | frob_text(&mod->core_layout, set_memory_rw); |
2010 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 2011 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
2012 | frob_text(&mod->init_layout, set_memory_rw); |
2013 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 2014 | } |
84e1c6bb | 2015 | |
444d13ff | 2016 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 2017 | { |
39290b38 AT |
2018 | if (!rodata_enabled) |
2019 | return; | |
2020 | ||
1a7b7d92 RE |
2021 | set_vm_flush_reset_perms(mod->core_layout.base); |
2022 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 2023 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 2024 | |
85c898db RR |
2025 | frob_rodata(&mod->core_layout, set_memory_ro); |
2026 | frob_text(&mod->init_layout, set_memory_ro); | |
2027 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
2028 | |
2029 | if (after_init) | |
2030 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
2031 | } |
2032 | ||
85c898db | 2033 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 2034 | { |
85c898db | 2035 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 2036 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
2037 | frob_writable_data(&mod->core_layout, set_memory_nx); |
2038 | frob_rodata(&mod->init_layout, set_memory_nx); | |
2039 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
2040 | } |
2041 | ||
93651f80 | 2042 | #else /* !CONFIG_STRICT_MODULE_RWX */ |
85c898db | 2043 | static void module_enable_nx(const struct module *mod) { } |
93651f80 | 2044 | #endif /* CONFIG_STRICT_MODULE_RWX */ |
2eef1399 YY |
2045 | static void module_enable_x(const struct module *mod) |
2046 | { | |
2047 | frob_text(&mod->core_layout, set_memory_x); | |
2048 | frob_text(&mod->init_layout, set_memory_x); | |
2049 | } | |
93651f80 YY |
2050 | #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ |
2051 | static void module_enable_nx(const struct module *mod) { } | |
2052 | static void module_enable_x(const struct module *mod) { } | |
2053 | #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
2054 | ||
84e1c6bb | 2055 | |
1ce15ef4 JY |
2056 | #ifdef CONFIG_LIVEPATCH |
2057 | /* | |
2058 | * Persist Elf information about a module. Copy the Elf header, | |
2059 | * section header table, section string table, and symtab section | |
2060 | * index from info to mod->klp_info. | |
2061 | */ | |
2062 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2063 | { | |
2064 | unsigned int size, symndx; | |
2065 | int ret; | |
2066 | ||
2067 | size = sizeof(*mod->klp_info); | |
2068 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2069 | if (mod->klp_info == NULL) | |
2070 | return -ENOMEM; | |
2071 | ||
2072 | /* Elf header */ | |
2073 | size = sizeof(mod->klp_info->hdr); | |
2074 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2075 | ||
2076 | /* Elf section header table */ | |
2077 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2078 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2079 | if (mod->klp_info->sechdrs == NULL) { |
2080 | ret = -ENOMEM; | |
2081 | goto free_info; | |
2082 | } | |
1ce15ef4 JY |
2083 | |
2084 | /* Elf section name string table */ | |
2085 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2086 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2087 | if (mod->klp_info->secstrings == NULL) { |
2088 | ret = -ENOMEM; | |
2089 | goto free_sechdrs; | |
2090 | } | |
1ce15ef4 JY |
2091 | |
2092 | /* Elf symbol section index */ | |
2093 | symndx = info->index.sym; | |
2094 | mod->klp_info->symndx = symndx; | |
2095 | ||
2096 | /* | |
2097 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2098 | * copy of the original symbol table. Adjust sh_addr to point | |
2099 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2100 | * init memory is freed at the end of do_init_module(). | |
2101 | */ | |
2102 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2103 | (unsigned long) mod->core_kallsyms.symtab; | |
2104 | ||
2105 | return 0; | |
2106 | ||
2107 | free_sechdrs: | |
2108 | kfree(mod->klp_info->sechdrs); | |
2109 | free_info: | |
2110 | kfree(mod->klp_info); | |
2111 | return ret; | |
2112 | } | |
2113 | ||
2114 | static void free_module_elf(struct module *mod) | |
2115 | { | |
2116 | kfree(mod->klp_info->sechdrs); | |
2117 | kfree(mod->klp_info->secstrings); | |
2118 | kfree(mod->klp_info); | |
2119 | } | |
2120 | #else /* !CONFIG_LIVEPATCH */ | |
2121 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2122 | { | |
2123 | return 0; | |
2124 | } | |
2125 | ||
2126 | static void free_module_elf(struct module *mod) | |
2127 | { | |
2128 | } | |
2129 | #endif /* CONFIG_LIVEPATCH */ | |
2130 | ||
be1f221c | 2131 | void __weak module_memfree(void *module_region) |
74e08fcf | 2132 | { |
1a7b7d92 RE |
2133 | /* |
2134 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2135 | * supported by vmalloc. | |
2136 | */ | |
2137 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2138 | vfree(module_region); |
2139 | } | |
2140 | ||
2141 | void __weak module_arch_cleanup(struct module *mod) | |
2142 | { | |
2143 | } | |
2144 | ||
d453cded RR |
2145 | void __weak module_arch_freeing_init(struct module *mod) |
2146 | { | |
2147 | } | |
2148 | ||
75676500 | 2149 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2150 | static void free_module(struct module *mod) |
2151 | { | |
7ead8b83 LZ |
2152 | trace_module_free(mod); |
2153 | ||
36b0360d | 2154 | mod_sysfs_teardown(mod); |
1da177e4 | 2155 | |
944a1fa0 RR |
2156 | /* We leave it in list to prevent duplicate loads, but make sure |
2157 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2158 | mutex_lock(&module_mutex); |
944a1fa0 | 2159 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2160 | mutex_unlock(&module_mutex); |
944a1fa0 | 2161 | |
b82bab4b JB |
2162 | /* Remove dynamic debug info */ |
2163 | ddebug_remove_module(mod->name); | |
2164 | ||
1da177e4 LT |
2165 | /* Arch-specific cleanup. */ |
2166 | module_arch_cleanup(mod); | |
2167 | ||
2168 | /* Module unload stuff */ | |
2169 | module_unload_free(mod); | |
2170 | ||
e180a6b7 RR |
2171 | /* Free any allocated parameters. */ |
2172 | destroy_params(mod->kp, mod->num_kp); | |
2173 | ||
1ce15ef4 JY |
2174 | if (is_livepatch_module(mod)) |
2175 | free_module_elf(mod); | |
2176 | ||
944a1fa0 RR |
2177 | /* Now we can delete it from the lists */ |
2178 | mutex_lock(&module_mutex); | |
461e34ae MH |
2179 | /* Unlink carefully: kallsyms could be walking list. */ |
2180 | list_del_rcu(&mod->list); | |
93c2e105 | 2181 | mod_tree_remove(mod); |
0286b5ea | 2182 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2183 | module_bug_cleanup(mod); |
0be964be | 2184 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2185 | synchronize_rcu(); |
944a1fa0 RR |
2186 | mutex_unlock(&module_mutex); |
2187 | ||
85c898db | 2188 | /* This may be empty, but that's OK */ |
d453cded | 2189 | module_arch_freeing_init(mod); |
7523e4dc | 2190 | module_memfree(mod->init_layout.base); |
1da177e4 | 2191 | kfree(mod->args); |
259354de | 2192 | percpu_modfree(mod); |
9f85a4bb | 2193 | |
35a9393c | 2194 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2195 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2196 | |
1da177e4 | 2197 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2198 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2199 | } |
2200 | ||
2201 | void *__symbol_get(const char *symbol) | |
2202 | { | |
2203 | struct module *owner; | |
414fd31b | 2204 | const struct kernel_symbol *sym; |
1da177e4 | 2205 | |
24da1cbf | 2206 | preempt_disable(); |
414fd31b TA |
2207 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2208 | if (sym && strong_try_module_get(owner)) | |
2209 | sym = NULL; | |
24da1cbf | 2210 | preempt_enable(); |
1da177e4 | 2211 | |
7290d580 | 2212 | return sym ? (void *)kernel_symbol_value(sym) : NULL; |
1da177e4 LT |
2213 | } |
2214 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2215 | ||
eea8b54d AN |
2216 | /* |
2217 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2218 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2219 | * |
2220 | * You must hold the module_mutex. | |
eea8b54d | 2221 | */ |
2d25bc55 | 2222 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2223 | { |
b211104d | 2224 | unsigned int i; |
eea8b54d | 2225 | struct module *owner; |
b211104d RR |
2226 | const struct kernel_symbol *s; |
2227 | struct { | |
2228 | const struct kernel_symbol *sym; | |
2229 | unsigned int num; | |
2230 | } arr[] = { | |
2231 | { mod->syms, mod->num_syms }, | |
2232 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2233 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2234 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2235 | { mod->unused_syms, mod->num_unused_syms }, |
2236 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2237 | #endif |
b211104d | 2238 | }; |
eea8b54d | 2239 | |
b211104d RR |
2240 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2241 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
7290d580 AB |
2242 | if (find_symbol(kernel_symbol_name(s), &owner, NULL, |
2243 | true, false)) { | |
bddb12b3 | 2244 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2245 | " (owned by %s)\n", |
7290d580 AB |
2246 | mod->name, kernel_symbol_name(s), |
2247 | module_name(owner)); | |
b211104d RR |
2248 | return -ENOEXEC; |
2249 | } | |
eea8b54d | 2250 | } |
b211104d RR |
2251 | } |
2252 | return 0; | |
eea8b54d AN |
2253 | } |
2254 | ||
9a4b9708 | 2255 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2256 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2257 | { | |
2258 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2259 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2260 | unsigned long secbase; |
49668688 | 2261 | unsigned int i; |
1da177e4 | 2262 | int ret = 0; |
414fd31b | 2263 | const struct kernel_symbol *ksym; |
1da177e4 | 2264 | |
49668688 RR |
2265 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2266 | const char *name = info->strtab + sym[i].st_name; | |
2267 | ||
1da177e4 LT |
2268 | switch (sym[i].st_shndx) { |
2269 | case SHN_COMMON: | |
80375980 JM |
2270 | /* Ignore common symbols */ |
2271 | if (!strncmp(name, "__gnu_lto", 9)) | |
2272 | break; | |
2273 | ||
1da177e4 LT |
2274 | /* We compiled with -fno-common. These are not |
2275 | supposed to happen. */ | |
5e124169 | 2276 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2277 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2278 | mod->name); |
2279 | ret = -ENOEXEC; | |
2280 | break; | |
2281 | ||
2282 | case SHN_ABS: | |
2283 | /* Don't need to do anything */ | |
5e124169 | 2284 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2285 | (long)sym[i].st_value); |
2286 | break; | |
2287 | ||
1ce15ef4 JY |
2288 | case SHN_LIVEPATCH: |
2289 | /* Livepatch symbols are resolved by livepatch */ | |
2290 | break; | |
2291 | ||
1da177e4 | 2292 | case SHN_UNDEF: |
49668688 | 2293 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2294 | /* Ok if resolved. */ |
9bea7f23 | 2295 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2296 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2297 | break; |
414fd31b TA |
2298 | } |
2299 | ||
1da177e4 | 2300 | /* Ok if weak. */ |
9bea7f23 | 2301 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2302 | break; |
2303 | ||
9bea7f23 | 2304 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2305 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2306 | mod->name, name, ret); | |
1da177e4 LT |
2307 | break; |
2308 | ||
2309 | default: | |
2310 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2311 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2312 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2313 | else |
49668688 | 2314 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2315 | sym[i].st_value += secbase; |
2316 | break; | |
2317 | } | |
2318 | } | |
2319 | ||
2320 | return ret; | |
2321 | } | |
2322 | ||
49668688 | 2323 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2324 | { |
2325 | unsigned int i; | |
2326 | int err = 0; | |
2327 | ||
2328 | /* Now do relocations. */ | |
49668688 RR |
2329 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2330 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2331 | |
2332 | /* Not a valid relocation section? */ | |
49668688 | 2333 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2334 | continue; |
2335 | ||
2336 | /* Don't bother with non-allocated sections */ | |
49668688 | 2337 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2338 | continue; |
2339 | ||
1ce15ef4 JY |
2340 | /* Livepatch relocation sections are applied by livepatch */ |
2341 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2342 | continue; | |
2343 | ||
49668688 RR |
2344 | if (info->sechdrs[i].sh_type == SHT_REL) |
2345 | err = apply_relocate(info->sechdrs, info->strtab, | |
2346 | info->index.sym, i, mod); | |
2347 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2348 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2349 | info->index.sym, i, mod); | |
22e268eb RR |
2350 | if (err < 0) |
2351 | break; | |
2352 | } | |
2353 | return err; | |
2354 | } | |
2355 | ||
088af9a6 HD |
2356 | /* Additional bytes needed by arch in front of individual sections */ |
2357 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2358 | unsigned int section) | |
2359 | { | |
2360 | /* default implementation just returns zero */ | |
2361 | return 0; | |
2362 | } | |
2363 | ||
1da177e4 | 2364 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2365 | static long get_offset(struct module *mod, unsigned int *size, |
2366 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2367 | { |
2368 | long ret; | |
2369 | ||
088af9a6 | 2370 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2371 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2372 | *size = ret + sechdr->sh_size; | |
2373 | return ret; | |
2374 | } | |
2375 | ||
2376 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2377 | might -- code, read-only data, read-write data, small data. Tally | |
2378 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2379 | belongs in init. */ | |
49668688 | 2380 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2381 | { |
2382 | static unsigned long const masks[][2] = { | |
2383 | /* NOTE: all executable code must be the first section | |
2384 | * in this array; otherwise modify the text_size | |
2385 | * finder in the two loops below */ | |
2386 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2387 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2388 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2389 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2390 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2391 | }; | |
2392 | unsigned int m, i; | |
2393 | ||
49668688 RR |
2394 | for (i = 0; i < info->hdr->e_shnum; i++) |
2395 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2396 | |
5e124169 | 2397 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2398 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2399 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2400 | Elf_Shdr *s = &info->sechdrs[i]; | |
2401 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2402 | |
2403 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2404 | || (s->sh_flags & masks[m][1]) | |
2405 | || s->sh_entsize != ~0UL | |
49668688 | 2406 | || strstarts(sname, ".init")) |
1da177e4 | 2407 | continue; |
7523e4dc | 2408 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2409 | pr_debug("\t%s\n", sname); |
1da177e4 | 2410 | } |
84e1c6bb MC |
2411 | switch (m) { |
2412 | case 0: /* executable */ | |
7523e4dc RR |
2413 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2414 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2415 | break; |
2416 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2417 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2418 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2419 | break; |
444d13ff JY |
2420 | case 2: /* RO after init */ |
2421 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2422 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2423 | break; | |
2424 | case 4: /* whole core */ | |
7523e4dc | 2425 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2426 | break; |
2427 | } | |
1da177e4 LT |
2428 | } |
2429 | ||
5e124169 | 2430 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2431 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2432 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2433 | Elf_Shdr *s = &info->sechdrs[i]; | |
2434 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2435 | |
2436 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2437 | || (s->sh_flags & masks[m][1]) | |
2438 | || s->sh_entsize != ~0UL | |
49668688 | 2439 | || !strstarts(sname, ".init")) |
1da177e4 | 2440 | continue; |
7523e4dc | 2441 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2442 | | INIT_OFFSET_MASK); |
5e124169 | 2443 | pr_debug("\t%s\n", sname); |
1da177e4 | 2444 | } |
84e1c6bb MC |
2445 | switch (m) { |
2446 | case 0: /* executable */ | |
7523e4dc RR |
2447 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2448 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2449 | break; |
2450 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2451 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2452 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2453 | break; |
444d13ff JY |
2454 | case 2: |
2455 | /* | |
2456 | * RO after init doesn't apply to init_layout (only | |
2457 | * core_layout), so it just takes the value of ro_size. | |
2458 | */ | |
2459 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2460 | break; | |
2461 | case 4: /* whole init */ | |
7523e4dc | 2462 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2463 | break; |
2464 | } | |
1da177e4 LT |
2465 | } |
2466 | } | |
2467 | ||
1da177e4 LT |
2468 | static void set_license(struct module *mod, const char *license) |
2469 | { | |
2470 | if (!license) | |
2471 | license = "unspecified"; | |
2472 | ||
fa3ba2e8 | 2473 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2474 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2475 | pr_warn("%s: module license '%s' taints kernel.\n", |
2476 | mod->name, license); | |
373d4d09 RR |
2477 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2478 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2479 | } |
2480 | } | |
2481 | ||
2482 | /* Parse tag=value strings from .modinfo section */ | |
2483 | static char *next_string(char *string, unsigned long *secsize) | |
2484 | { | |
2485 | /* Skip non-zero chars */ | |
2486 | while (string[0]) { | |
2487 | string++; | |
2488 | if ((*secsize)-- <= 1) | |
2489 | return NULL; | |
2490 | } | |
2491 | ||
2492 | /* Skip any zero padding. */ | |
2493 | while (!string[0]) { | |
2494 | string++; | |
2495 | if ((*secsize)-- <= 1) | |
2496 | return NULL; | |
2497 | } | |
2498 | return string; | |
2499 | } | |
2500 | ||
c5e4a062 MM |
2501 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
2502 | char *prev) | |
1da177e4 LT |
2503 | { |
2504 | char *p; | |
2505 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2506 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2507 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2508 | |
5fdc7db6 JY |
2509 | /* |
2510 | * get_modinfo() calls made before rewrite_section_headers() | |
2511 | * must use sh_offset, as sh_addr isn't set! | |
2512 | */ | |
c5e4a062 MM |
2513 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
2514 | ||
2515 | if (prev) { | |
2516 | size -= prev - modinfo; | |
2517 | modinfo = next_string(prev, &size); | |
2518 | } | |
2519 | ||
2520 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2521 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2522 | return p + taglen + 1; | |
2523 | } | |
2524 | return NULL; | |
2525 | } | |
2526 | ||
c5e4a062 MM |
2527 | static char *get_modinfo(const struct load_info *info, const char *tag) |
2528 | { | |
2529 | return get_next_modinfo(info, tag, NULL); | |
2530 | } | |
2531 | ||
49668688 | 2532 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2533 | { |
2534 | struct module_attribute *attr; | |
2535 | int i; | |
2536 | ||
2537 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2538 | if (attr->setup) | |
49668688 | 2539 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2540 | } |
2541 | } | |
c988d2b2 | 2542 | |
a263f776 RR |
2543 | static void free_modinfo(struct module *mod) |
2544 | { | |
2545 | struct module_attribute *attr; | |
2546 | int i; | |
2547 | ||
2548 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2549 | if (attr->free) | |
2550 | attr->free(mod); | |
2551 | } | |
2552 | } | |
2553 | ||
1da177e4 | 2554 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2555 | |
2d25bc55 JY |
2556 | /* Lookup exported symbol in given range of kernel_symbols */ |
2557 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2558 | const struct kernel_symbol *start, | |
2559 | const struct kernel_symbol *stop) | |
15bba37d | 2560 | { |
9d63487f AIB |
2561 | return bsearch(name, start, stop - start, |
2562 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2563 | } |
2564 | ||
ca4787b7 TA |
2565 | static int is_exported(const char *name, unsigned long value, |
2566 | const struct module *mod) | |
1da177e4 | 2567 | { |
ca4787b7 TA |
2568 | const struct kernel_symbol *ks; |
2569 | if (!mod) | |
2d25bc55 | 2570 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2571 | else |
2d25bc55 JY |
2572 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2573 | ||
7290d580 | 2574 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2575 | } |
2576 | ||
2577 | /* As per nm */ | |
eded41c1 | 2578 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2579 | { |
eded41c1 RR |
2580 | const Elf_Shdr *sechdrs = info->sechdrs; |
2581 | ||
1da177e4 LT |
2582 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2583 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2584 | return 'v'; | |
2585 | else | |
2586 | return 'w'; | |
2587 | } | |
2588 | if (sym->st_shndx == SHN_UNDEF) | |
2589 | return 'U'; | |
e0224418 | 2590 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2591 | return 'a'; |
2592 | if (sym->st_shndx >= SHN_LORESERVE) | |
2593 | return '?'; | |
2594 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2595 | return 't'; | |
2596 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2597 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2598 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2599 | return 'r'; | |
2600 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2601 | return 'g'; | |
2602 | else | |
2603 | return 'd'; | |
2604 | } | |
2605 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2606 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2607 | return 's'; | |
2608 | else | |
2609 | return 'b'; | |
2610 | } | |
eded41c1 RR |
2611 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2612 | ".debug")) { | |
1da177e4 | 2613 | return 'n'; |
eded41c1 | 2614 | } |
1da177e4 LT |
2615 | return '?'; |
2616 | } | |
2617 | ||
4a496226 | 2618 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2619 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2620 | { |
2621 | const Elf_Shdr *sec; | |
2622 | ||
2623 | if (src->st_shndx == SHN_UNDEF | |
2624 | || src->st_shndx >= shnum | |
2625 | || !src->st_name) | |
2626 | return false; | |
2627 | ||
e0224418 MB |
2628 | #ifdef CONFIG_KALLSYMS_ALL |
2629 | if (src->st_shndx == pcpundx) | |
2630 | return true; | |
2631 | #endif | |
2632 | ||
4a496226 JB |
2633 | sec = sechdrs + src->st_shndx; |
2634 | if (!(sec->sh_flags & SHF_ALLOC) | |
2635 | #ifndef CONFIG_KALLSYMS_ALL | |
2636 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2637 | #endif | |
2638 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2639 | return false; | |
2640 | ||
2641 | return true; | |
2642 | } | |
2643 | ||
48fd1188 KC |
2644 | /* |
2645 | * We only allocate and copy the strings needed by the parts of symtab | |
2646 | * we keep. This is simple, but has the effect of making multiple | |
2647 | * copies of duplicates. We could be more sophisticated, see | |
2648 | * linux-kernel thread starting with | |
2649 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2650 | */ | |
49668688 | 2651 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2652 | { |
49668688 RR |
2653 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2654 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2655 | const Elf_Sym *src; |
54523ec7 | 2656 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2657 | |
2658 | /* Put symbol section at end of init part of module. */ | |
2659 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2660 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2661 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2662 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2663 | |
49668688 | 2664 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2665 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2666 | |
48fd1188 | 2667 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2668 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2669 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2670 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2671 | info->index.pcpu)) { | |
59ef28b1 | 2672 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2673 | ndst++; |
554bdfe5 | 2674 | } |
59ef28b1 | 2675 | } |
4a496226 JB |
2676 | |
2677 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2678 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2679 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2680 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2681 | info->core_typeoffs = mod->core_layout.size; |
2682 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2683 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2684 | |
554bdfe5 JB |
2685 | /* Put string table section at end of init part of module. */ |
2686 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2687 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2688 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2689 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2690 | |
2691 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2692 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2693 | __alignof__(struct mod_kallsyms)); | |
2694 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2695 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2696 | info->init_typeoffs = mod->init_layout.size; |
2697 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2698 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2699 | } |
2700 | ||
8244062e RR |
2701 | /* |
2702 | * We use the full symtab and strtab which layout_symtab arranged to | |
2703 | * be appended to the init section. Later we switch to the cut-down | |
2704 | * core-only ones. | |
2705 | */ | |
811d66a0 | 2706 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2707 | { |
4a496226 JB |
2708 | unsigned int i, ndst; |
2709 | const Elf_Sym *src; | |
2710 | Elf_Sym *dst; | |
554bdfe5 | 2711 | char *s; |
eded41c1 | 2712 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2713 | |
8244062e RR |
2714 | /* Set up to point into init section. */ |
2715 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2716 | ||
2717 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2718 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2719 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2720 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2721 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2722 | |
1c7651f4 EL |
2723 | /* |
2724 | * Now populate the cut down core kallsyms for after init | |
2725 | * and set types up while we still have access to sections. | |
2726 | */ | |
8244062e RR |
2727 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2728 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2729 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2730 | src = mod->kallsyms->symtab; |
2731 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2732 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2733 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2734 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2735 | info->index.pcpu)) { | |
1c7651f4 EL |
2736 | mod->core_kallsyms.typetab[ndst] = |
2737 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2738 | dst[ndst] = src[i]; |
8244062e RR |
2739 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2740 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2741 | KSYM_NAME_LEN) + 1; |
2742 | } | |
4a496226 | 2743 | } |
8244062e | 2744 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2745 | } |
2746 | #else | |
49668688 | 2747 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2748 | { |
2749 | } | |
3ae91c21 | 2750 | |
abbce906 | 2751 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2752 | { |
2753 | } | |
2754 | #endif /* CONFIG_KALLSYMS */ | |
2755 | ||
52796312 | 2756 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2757 | { |
811d66a0 RR |
2758 | if (!debug) |
2759 | return; | |
513770f5 | 2760 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2761 | } |
346e15be | 2762 | |
52796312 | 2763 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2764 | { |
2765 | if (debug) | |
52796312 | 2766 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2767 | } |
2768 | ||
74e08fcf JB |
2769 | void * __weak module_alloc(unsigned long size) |
2770 | { | |
82fab442 | 2771 | return vmalloc_exec(size); |
74e08fcf JB |
2772 | } |
2773 | ||
38b37d63 MS |
2774 | bool __weak module_exit_section(const char *name) |
2775 | { | |
2776 | return strstarts(name, ".exit"); | |
2777 | } | |
2778 | ||
4f2294b6 | 2779 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2780 | static void kmemleak_load_module(const struct module *mod, |
2781 | const struct load_info *info) | |
4f2294b6 CM |
2782 | { |
2783 | unsigned int i; | |
2784 | ||
2785 | /* only scan the sections containing data */ | |
c017b4be | 2786 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2787 | |
49668688 | 2788 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2789 | /* Scan all writable sections that's not executable */ |
2790 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2791 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2792 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2793 | continue; |
2794 | ||
49668688 RR |
2795 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2796 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2797 | } |
2798 | } | |
2799 | #else | |
49668688 RR |
2800 | static inline void kmemleak_load_module(const struct module *mod, |
2801 | const struct load_info *info) | |
4f2294b6 CM |
2802 | { |
2803 | } | |
2804 | #endif | |
2805 | ||
106a4ee2 | 2806 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2807 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 | 2808 | { |
49fcf732 | 2809 | int err = -ENODATA; |
34e1169d | 2810 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
49fcf732 | 2811 | const char *reason; |
34e1169d | 2812 | const void *mod = info->hdr; |
caabe240 | 2813 | |
bca014ca BH |
2814 | /* |
2815 | * Require flags == 0, as a module with version information | |
2816 | * removed is no longer the module that was signed | |
2817 | */ | |
2818 | if (flags == 0 && | |
2819 | info->len > markerlen && | |
34e1169d | 2820 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2821 | /* We truncate the module to discard the signature */ |
34e1169d | 2822 | info->len -= markerlen; |
f314dfea | 2823 | err = mod_verify_sig(mod, info); |
106a4ee2 RR |
2824 | } |
2825 | ||
49fcf732 DH |
2826 | switch (err) { |
2827 | case 0: | |
106a4ee2 RR |
2828 | info->sig_ok = true; |
2829 | return 0; | |
106a4ee2 | 2830 | |
49fcf732 DH |
2831 | /* We don't permit modules to be loaded into trusted kernels |
2832 | * without a valid signature on them, but if we're not | |
2833 | * enforcing, certain errors are non-fatal. | |
2834 | */ | |
2835 | case -ENODATA: | |
2836 | reason = "Loading of unsigned module"; | |
2837 | goto decide; | |
2838 | case -ENOPKG: | |
2839 | reason = "Loading of module with unsupported crypto"; | |
2840 | goto decide; | |
2841 | case -ENOKEY: | |
2842 | reason = "Loading of module with unavailable key"; | |
2843 | decide: | |
2844 | if (is_module_sig_enforced()) { | |
e9f35f63 | 2845 | pr_notice("%s: %s is rejected\n", info->name, reason); |
49fcf732 DH |
2846 | return -EKEYREJECTED; |
2847 | } | |
106a4ee2 | 2848 | |
49fcf732 DH |
2849 | return security_locked_down(LOCKDOWN_MODULE_SIGNATURE); |
2850 | ||
2851 | /* All other errors are fatal, including nomem, unparseable | |
2852 | * signatures and signature check failures - even if signatures | |
2853 | * aren't required. | |
2854 | */ | |
2855 | default: | |
2856 | return err; | |
2857 | } | |
106a4ee2 RR |
2858 | } |
2859 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2860 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2861 | { |
2862 | return 0; | |
2863 | } | |
2864 | #endif /* !CONFIG_MODULE_SIG */ | |
2865 | ||
34e1169d KC |
2866 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2867 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2868 | { |
34e1169d KC |
2869 | if (info->len < sizeof(*(info->hdr))) |
2870 | return -ENOEXEC; | |
2871 | ||
2872 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2873 | || info->hdr->e_type != ET_REL | |
2874 | || !elf_check_arch(info->hdr) | |
2875 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2876 | return -ENOEXEC; | |
2877 | ||
2878 | if (info->hdr->e_shoff >= info->len | |
2879 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2880 | info->len - info->hdr->e_shoff)) | |
2881 | return -ENOEXEC; | |
40dd2560 | 2882 | |
34e1169d KC |
2883 | return 0; |
2884 | } | |
2885 | ||
3afe9f84 LT |
2886 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2887 | ||
2888 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2889 | { | |
2890 | do { | |
2891 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2892 | ||
2893 | if (copy_from_user(dst, usrc, n) != 0) | |
2894 | return -EFAULT; | |
2895 | cond_resched(); | |
2896 | dst += n; | |
2897 | usrc += n; | |
2898 | len -= n; | |
2899 | } while (len); | |
2900 | return 0; | |
2901 | } | |
2902 | ||
1ce15ef4 | 2903 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2904 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2905 | { |
2992ef29 JP |
2906 | if (get_modinfo(info, "livepatch")) { |
2907 | mod->klp = true; | |
2908 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2909 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2910 | mod->name); | |
2992ef29 | 2911 | } |
1ce15ef4 JY |
2912 | |
2913 | return 0; | |
2914 | } | |
2915 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2916 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2917 | { |
2918 | if (get_modinfo(info, "livepatch")) { | |
2919 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2920 | mod->name); | |
2921 | return -ENOEXEC; | |
2922 | } | |
2923 | ||
2924 | return 0; | |
2925 | } | |
2926 | #endif /* CONFIG_LIVEPATCH */ | |
2927 | ||
caf7501a AK |
2928 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
2929 | { | |
2930 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
2931 | return; | |
2932 | ||
2933 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
2934 | mod->name); | |
2935 | } | |
2936 | ||
34e1169d KC |
2937 | /* Sets info->hdr and info->len. */ |
2938 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2939 | struct load_info *info) | |
40dd2560 RR |
2940 | { |
2941 | int err; | |
40dd2560 | 2942 | |
34e1169d KC |
2943 | info->len = len; |
2944 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2945 | return -ENOEXEC; |
2946 | ||
c77b8cdf | 2947 | err = security_kernel_load_data(LOADING_MODULE); |
2e72d51b KC |
2948 | if (err) |
2949 | return err; | |
2950 | ||
40dd2560 | 2951 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2952 | info->hdr = __vmalloc(info->len, |
19809c2d | 2953 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2954 | if (!info->hdr) |
40dd2560 RR |
2955 | return -ENOMEM; |
2956 | ||
3afe9f84 | 2957 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2958 | vfree(info->hdr); |
2959 | return -EFAULT; | |
40dd2560 RR |
2960 | } |
2961 | ||
34e1169d KC |
2962 | return 0; |
2963 | } | |
2964 | ||
d913188c RR |
2965 | static void free_copy(struct load_info *info) |
2966 | { | |
d913188c RR |
2967 | vfree(info->hdr); |
2968 | } | |
2969 | ||
2f3238ae | 2970 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2971 | { |
2972 | unsigned int i; | |
2973 | ||
2974 | /* This should always be true, but let's be sure. */ | |
2975 | info->sechdrs[0].sh_addr = 0; | |
2976 | ||
2977 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2978 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2979 | if (shdr->sh_type != SHT_NOBITS | |
2980 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2981 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2982 | return -ENOEXEC; |
2983 | } | |
2984 | ||
2985 | /* Mark all sections sh_addr with their address in the | |
2986 | temporary image. */ | |
2987 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2988 | ||
2989 | #ifndef CONFIG_MODULE_UNLOAD | |
2990 | /* Don't load .exit sections */ | |
38b37d63 | 2991 | if (module_exit_section(info->secstrings+shdr->sh_name)) |
8b5f61a7 RR |
2992 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; |
2993 | #endif | |
8b5f61a7 | 2994 | } |
d6df72a0 RR |
2995 | |
2996 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 2997 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 2998 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 2999 | |
8b5f61a7 RR |
3000 | return 0; |
3001 | } | |
3002 | ||
3264d3f9 LT |
3003 | /* |
3004 | * Set up our basic convenience variables (pointers to section headers, | |
3005 | * search for module section index etc), and do some basic section | |
3006 | * verification. | |
3007 | * | |
81a0abd9 JY |
3008 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
3009 | * will be allocated in move_module(). | |
3264d3f9 | 3010 | */ |
81a0abd9 | 3011 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
3012 | { |
3013 | unsigned int i; | |
3264d3f9 LT |
3014 | |
3015 | /* Set up the convenience variables */ | |
3016 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
3017 | info->secstrings = (void *)info->hdr |
3018 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 3019 | |
5fdc7db6 JY |
3020 | /* Try to find a name early so we can log errors with a module name */ |
3021 | info->index.info = find_sec(info, ".modinfo"); | |
708e0ada | 3022 | if (info->index.info) |
5fdc7db6 | 3023 | info->name = get_modinfo(info, "name"); |
3264d3f9 | 3024 | |
8b5f61a7 RR |
3025 | /* Find internal symbols and strings. */ |
3026 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
3027 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
3028 | info->index.sym = i; | |
3029 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
3030 | info->strtab = (char *)info->hdr |
3031 | + info->sechdrs[info->index.str].sh_offset; | |
3032 | break; | |
3264d3f9 | 3033 | } |
3264d3f9 LT |
3034 | } |
3035 | ||
5fdc7db6 | 3036 | if (info->index.sym == 0) { |
708e0ada JY |
3037 | pr_warn("%s: module has no symbols (stripped?)\n", |
3038 | info->name ?: "(missing .modinfo section or name field)"); | |
5fdc7db6 JY |
3039 | return -ENOEXEC; |
3040 | } | |
3041 | ||
49668688 | 3042 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 3043 | if (!info->index.mod) { |
3e2e857f | 3044 | pr_warn("%s: No module found in object\n", |
708e0ada | 3045 | info->name ?: "(missing .modinfo section or name field)"); |
81a0abd9 | 3046 | return -ENOEXEC; |
3264d3f9 LT |
3047 | } |
3048 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 3049 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 3050 | |
3e2e857f | 3051 | /* |
5fdc7db6 | 3052 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
3053 | * on-disk struct mod 'name' field. |
3054 | */ | |
3055 | if (!info->name) | |
81a0abd9 | 3056 | info->name = info->mod->name; |
3e2e857f | 3057 | |
5fdc7db6 JY |
3058 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
3059 | info->index.vers = 0; /* Pretend no __versions section! */ | |
3060 | else | |
3061 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 3062 | |
49668688 | 3063 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3064 | |
81a0abd9 | 3065 | return 0; |
3264d3f9 LT |
3066 | } |
3067 | ||
2f3238ae | 3068 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3069 | { |
49668688 | 3070 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3071 | int err; |
3072 | ||
2f3238ae RR |
3073 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3074 | modmagic = NULL; | |
3075 | ||
40dd2560 RR |
3076 | /* This is allowed: modprobe --force will invalidate it. */ |
3077 | if (!modmagic) { | |
3078 | err = try_to_force_load(mod, "bad vermagic"); | |
3079 | if (err) | |
3080 | return err; | |
49668688 | 3081 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3082 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3083 | info->name, modmagic, vermagic); |
40dd2560 RR |
3084 | return -ENOEXEC; |
3085 | } | |
3086 | ||
3205c36c LP |
3087 | if (!get_modinfo(info, "intree")) { |
3088 | if (!test_taint(TAINT_OOT_MODULE)) | |
3089 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3090 | mod->name); | |
373d4d09 | 3091 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3092 | } |
2449b8ba | 3093 | |
caf7501a AK |
3094 | check_modinfo_retpoline(mod, info); |
3095 | ||
49668688 | 3096 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3097 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3098 | pr_warn("%s: module is from the staging directory, the quality " |
3099 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3100 | } |
22e268eb | 3101 | |
2992ef29 | 3102 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3103 | if (err) |
3104 | return err; | |
3105 | ||
22e268eb | 3106 | /* Set up license info based on the info section */ |
49668688 | 3107 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3108 | |
40dd2560 RR |
3109 | return 0; |
3110 | } | |
3111 | ||
eb3057df | 3112 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3113 | { |
49668688 | 3114 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3115 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3116 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3117 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3118 | mod->crcs = section_addr(info, "__kcrctab"); |
3119 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3120 | sizeof(*mod->gpl_syms), |
3121 | &mod->num_gpl_syms); | |
49668688 RR |
3122 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3123 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3124 | "__ksymtab_gpl_future", |
3125 | sizeof(*mod->gpl_future_syms), | |
3126 | &mod->num_gpl_future_syms); | |
49668688 | 3127 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3128 | |
3129 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3130 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3131 | sizeof(*mod->unused_syms), |
3132 | &mod->num_unused_syms); | |
49668688 RR |
3133 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3134 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3135 | sizeof(*mod->unused_gpl_syms), |
3136 | &mod->num_unused_gpl_syms); | |
49668688 | 3137 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3138 | #endif |
3139 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3140 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3141 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3142 | if (!mod->ctors) |
3143 | mod->ctors = section_objs(info, ".init_array", | |
3144 | sizeof(*mod->ctors), &mod->num_ctors); | |
3145 | else if (find_sec(info, ".init_array")) { | |
3146 | /* | |
3147 | * This shouldn't happen with same compiler and binutils | |
3148 | * building all parts of the module. | |
3149 | */ | |
6da0b565 | 3150 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3151 | mod->name); |
3152 | return -EINVAL; | |
3153 | } | |
f91a13bb LT |
3154 | #endif |
3155 | ||
3156 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3157 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3158 | sizeof(*mod->tracepoints_ptrs), | |
3159 | &mod->num_tracepoints); | |
f91a13bb | 3160 | #endif |
fe15b50c PM |
3161 | #ifdef CONFIG_TREE_SRCU |
3162 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
3163 | sizeof(*mod->srcu_struct_ptrs), | |
3164 | &mod->num_srcu_structs); | |
3165 | #endif | |
a38d1107 MM |
3166 | #ifdef CONFIG_BPF_EVENTS |
3167 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3168 | sizeof(*mod->bpf_raw_events), | |
3169 | &mod->num_bpf_raw_events); | |
3170 | #endif | |
e9666d10 | 3171 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3172 | mod->jump_entries = section_objs(info, "__jump_table", |
3173 | sizeof(*mod->jump_entries), | |
3174 | &mod->num_jump_entries); | |
3175 | #endif | |
f91a13bb | 3176 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3177 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3178 | sizeof(*mod->trace_events), |
3179 | &mod->num_trace_events); | |
99be647c JL |
3180 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3181 | sizeof(*mod->trace_evals), | |
3182 | &mod->num_trace_evals); | |
f91a13bb | 3183 | #endif |
13b9b6e7 SR |
3184 | #ifdef CONFIG_TRACING |
3185 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3186 | sizeof(*mod->trace_bprintk_fmt_start), | |
3187 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3188 | #endif |
f91a13bb LT |
3189 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3190 | /* sechdrs[0].sh_size is always zero */ | |
a1326b17 | 3191 | mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION, |
f91a13bb LT |
3192 | sizeof(*mod->ftrace_callsites), |
3193 | &mod->num_ftrace_callsites); | |
3194 | #endif | |
540adea3 MH |
3195 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3196 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3197 | sizeof(*mod->ei_funcs), | |
3198 | &mod->num_ei_funcs); | |
92ace999 | 3199 | #endif |
811d66a0 RR |
3200 | mod->extable = section_objs(info, "__ex_table", |
3201 | sizeof(*mod->extable), &mod->num_exentries); | |
3202 | ||
49668688 | 3203 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3204 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3205 | |
3206 | info->debug = section_objs(info, "__verbose", | |
3207 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3208 | |
3209 | return 0; | |
f91a13bb LT |
3210 | } |
3211 | ||
49668688 | 3212 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3213 | { |
3214 | int i; | |
3215 | void *ptr; | |
3216 | ||
3217 | /* Do the allocs. */ | |
7523e4dc | 3218 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3219 | /* |
3220 | * The pointer to this block is stored in the module structure | |
3221 | * which is inside the block. Just mark it as not being a | |
3222 | * leak. | |
3223 | */ | |
3224 | kmemleak_not_leak(ptr); | |
3225 | if (!ptr) | |
d913188c | 3226 | return -ENOMEM; |
65b8a9b4 | 3227 | |
7523e4dc RR |
3228 | memset(ptr, 0, mod->core_layout.size); |
3229 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3230 | |
7523e4dc RR |
3231 | if (mod->init_layout.size) { |
3232 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3233 | /* |
3234 | * The pointer to this block is stored in the module structure | |
3235 | * which is inside the block. This block doesn't need to be | |
3236 | * scanned as it contains data and code that will be freed | |
3237 | * after the module is initialized. | |
3238 | */ | |
3239 | kmemleak_ignore(ptr); | |
3240 | if (!ptr) { | |
7523e4dc | 3241 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3242 | return -ENOMEM; |
3243 | } | |
7523e4dc RR |
3244 | memset(ptr, 0, mod->init_layout.size); |
3245 | mod->init_layout.base = ptr; | |
82fab442 | 3246 | } else |
7523e4dc | 3247 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3248 | |
3249 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3250 | pr_debug("final section addresses:\n"); |
49668688 | 3251 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3252 | void *dest; |
49668688 | 3253 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3254 | |
49668688 | 3255 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3256 | continue; |
3257 | ||
49668688 | 3258 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3259 | dest = mod->init_layout.base |
49668688 | 3260 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3261 | else |
7523e4dc | 3262 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3263 | |
49668688 RR |
3264 | if (shdr->sh_type != SHT_NOBITS) |
3265 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3266 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3267 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3268 | pr_debug("\t0x%lx %s\n", |
3269 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3270 | } |
d913188c RR |
3271 | |
3272 | return 0; | |
65b8a9b4 LT |
3273 | } |
3274 | ||
49668688 | 3275 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3276 | { |
3205c36c LP |
3277 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3278 | ||
22e268eb RR |
3279 | /* |
3280 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3281 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3282 | * using GPL-only symbols it needs. | |
3283 | */ | |
3284 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3285 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3286 | |
3287 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3288 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3289 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3290 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3291 | |
c99af375 MG |
3292 | /* lve claims to be GPL but upstream won't provide source */ |
3293 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3294 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3295 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3296 | |
3205c36c LP |
3297 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3298 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3299 | ||
22e268eb RR |
3300 | #ifdef CONFIG_MODVERSIONS |
3301 | if ((mod->num_syms && !mod->crcs) | |
3302 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3303 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3304 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3305 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3306 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3307 | #endif | |
3308 | ) { | |
3309 | return try_to_force_load(mod, | |
3310 | "no versions for exported symbols"); | |
3311 | } | |
3312 | #endif | |
3313 | return 0; | |
3314 | } | |
3315 | ||
3316 | static void flush_module_icache(const struct module *mod) | |
3317 | { | |
3318 | mm_segment_t old_fs; | |
3319 | ||
3320 | /* flush the icache in correct context */ | |
3321 | old_fs = get_fs(); | |
3322 | set_fs(KERNEL_DS); | |
3323 | ||
3324 | /* | |
3325 | * Flush the instruction cache, since we've played with text. | |
3326 | * Do it before processing of module parameters, so the module | |
3327 | * can provide parameter accessor functions of its own. | |
3328 | */ | |
7523e4dc RR |
3329 | if (mod->init_layout.base) |
3330 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3331 | (unsigned long)mod->init_layout.base | |
3332 | + mod->init_layout.size); | |
3333 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3334 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3335 | |
3336 | set_fs(old_fs); | |
3337 | } | |
3338 | ||
74e08fcf JB |
3339 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3340 | Elf_Shdr *sechdrs, | |
3341 | char *secstrings, | |
3342 | struct module *mod) | |
3343 | { | |
3344 | return 0; | |
3345 | } | |
3346 | ||
be7de5f9 PB |
3347 | /* module_blacklist is a comma-separated list of module names */ |
3348 | static char *module_blacklist; | |
96b5b194 | 3349 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3350 | { |
3351 | const char *p; | |
3352 | size_t len; | |
3353 | ||
3354 | if (!module_blacklist) | |
3355 | return false; | |
3356 | ||
3357 | for (p = module_blacklist; *p; p += len) { | |
3358 | len = strcspn(p, ","); | |
3359 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3360 | return true; | |
3361 | if (p[len] == ',') | |
3362 | len++; | |
3363 | } | |
3364 | return false; | |
3365 | } | |
3366 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3367 | ||
2f3238ae | 3368 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3369 | { |
1da177e4 | 3370 | struct module *mod; |
444d13ff | 3371 | unsigned int ndx; |
d913188c | 3372 | int err; |
3ae91c21 | 3373 | |
81a0abd9 | 3374 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3375 | if (err) |
3376 | return ERR_PTR(err); | |
1da177e4 | 3377 | |
1da177e4 | 3378 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3379 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3380 | info->secstrings, info->mod); |
1da177e4 | 3381 | if (err < 0) |
8d8022e8 | 3382 | return ERR_PTR(err); |
1da177e4 | 3383 | |
8d8022e8 RR |
3384 | /* We will do a special allocation for per-cpu sections later. */ |
3385 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3386 | |
444d13ff JY |
3387 | /* |
3388 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3389 | * layout_sections() can put it in the right place. | |
3390 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3391 | */ | |
3392 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3393 | if (ndx) |
3394 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3395 | /* | |
3396 | * Mark the __jump_table section as ro_after_init as well: these data | |
3397 | * structures are never modified, with the exception of entries that | |
3398 | * refer to code in the __init section, which are annotated as such | |
3399 | * at module load time. | |
3400 | */ | |
3401 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3402 | if (ndx) |
3403 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3404 | ||
1da177e4 LT |
3405 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3406 | this is done generically; there doesn't appear to be any | |
3407 | special cases for the architectures. */ | |
81a0abd9 JY |
3408 | layout_sections(info->mod, info); |
3409 | layout_symtab(info->mod, info); | |
1da177e4 | 3410 | |
65b8a9b4 | 3411 | /* Allocate and move to the final place */ |
81a0abd9 | 3412 | err = move_module(info->mod, info); |
d913188c | 3413 | if (err) |
8d8022e8 | 3414 | return ERR_PTR(err); |
d913188c RR |
3415 | |
3416 | /* Module has been copied to its final place now: return it. */ | |
3417 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3418 | kmemleak_load_module(mod, info); |
d913188c | 3419 | return mod; |
d913188c RR |
3420 | } |
3421 | ||
3422 | /* mod is no longer valid after this! */ | |
3423 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3424 | { | |
d913188c | 3425 | percpu_modfree(mod); |
d453cded | 3426 | module_arch_freeing_init(mod); |
7523e4dc RR |
3427 | module_memfree(mod->init_layout.base); |
3428 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3429 | } |
3430 | ||
74e08fcf JB |
3431 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3432 | const Elf_Shdr *sechdrs, | |
3433 | struct module *me) | |
3434 | { | |
3435 | return 0; | |
3436 | } | |
3437 | ||
811d66a0 RR |
3438 | static int post_relocation(struct module *mod, const struct load_info *info) |
3439 | { | |
51f3d0f4 | 3440 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3441 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3442 | ||
3443 | /* Copy relocated percpu area over. */ | |
3444 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3445 | info->sechdrs[info->index.pcpu].sh_size); | |
3446 | ||
51f3d0f4 | 3447 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3448 | add_kallsyms(mod, info); |
3449 | ||
3450 | /* Arch-specific module finalizing. */ | |
3451 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3452 | } | |
3453 | ||
9bb9c3be RR |
3454 | /* Is this module of this name done loading? No locks held. */ |
3455 | static bool finished_loading(const char *name) | |
3456 | { | |
3457 | struct module *mod; | |
3458 | bool ret; | |
3459 | ||
9cc019b8 PZ |
3460 | /* |
3461 | * The module_mutex should not be a heavily contended lock; | |
3462 | * if we get the occasional sleep here, we'll go an extra iteration | |
3463 | * in the wait_event_interruptible(), which is harmless. | |
3464 | */ | |
3465 | sched_annotate_sleep(); | |
9bb9c3be | 3466 | mutex_lock(&module_mutex); |
4f6de4d5 | 3467 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 3468 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
3469 | mutex_unlock(&module_mutex); |
3470 | ||
3471 | return ret; | |
3472 | } | |
3473 | ||
34e1169d KC |
3474 | /* Call module constructors. */ |
3475 | static void do_mod_ctors(struct module *mod) | |
3476 | { | |
3477 | #ifdef CONFIG_CONSTRUCTORS | |
3478 | unsigned long i; | |
3479 | ||
3480 | for (i = 0; i < mod->num_ctors; i++) | |
3481 | mod->ctors[i](); | |
3482 | #endif | |
3483 | } | |
3484 | ||
c7496379 RR |
3485 | /* For freeing module_init on success, in case kallsyms traversing */ |
3486 | struct mod_initfree { | |
1a7b7d92 | 3487 | struct llist_node node; |
c7496379 RR |
3488 | void *module_init; |
3489 | }; | |
3490 | ||
1a7b7d92 | 3491 | static void do_free_init(struct work_struct *w) |
c7496379 | 3492 | { |
1a7b7d92 RE |
3493 | struct llist_node *pos, *n, *list; |
3494 | struct mod_initfree *initfree; | |
3495 | ||
3496 | list = llist_del_all(&init_free_list); | |
3497 | ||
3498 | synchronize_rcu(); | |
3499 | ||
3500 | llist_for_each_safe(pos, n, list) { | |
3501 | initfree = container_of(pos, struct mod_initfree, node); | |
3502 | module_memfree(initfree->module_init); | |
3503 | kfree(initfree); | |
3504 | } | |
c7496379 RR |
3505 | } |
3506 | ||
1a7b7d92 RE |
3507 | static int __init modules_wq_init(void) |
3508 | { | |
3509 | INIT_WORK(&init_free_wq, do_free_init); | |
3510 | init_llist_head(&init_free_list); | |
3511 | return 0; | |
3512 | } | |
3513 | module_init(modules_wq_init); | |
3514 | ||
be02a186 JK |
3515 | /* |
3516 | * This is where the real work happens. | |
3517 | * | |
3518 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3519 | * helper command 'lx-symbols'. | |
3520 | */ | |
3521 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3522 | { |
3523 | int ret = 0; | |
c7496379 RR |
3524 | struct mod_initfree *freeinit; |
3525 | ||
3526 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3527 | if (!freeinit) { | |
3528 | ret = -ENOMEM; | |
3529 | goto fail; | |
3530 | } | |
7523e4dc | 3531 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3532 | |
774a1221 TH |
3533 | /* |
3534 | * We want to find out whether @mod uses async during init. Clear | |
3535 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3536 | */ | |
3537 | current->flags &= ~PF_USED_ASYNC; | |
3538 | ||
34e1169d KC |
3539 | do_mod_ctors(mod); |
3540 | /* Start the module */ | |
3541 | if (mod->init != NULL) | |
3542 | ret = do_one_initcall(mod->init); | |
3543 | if (ret < 0) { | |
c7496379 | 3544 | goto fail_free_freeinit; |
34e1169d KC |
3545 | } |
3546 | if (ret > 0) { | |
bddb12b3 AM |
3547 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3548 | "follow 0/-E convention\n" | |
3549 | "%s: loading module anyway...\n", | |
3550 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3551 | dump_stack(); |
3552 | } | |
3553 | ||
3554 | /* Now it's a first class citizen! */ | |
3555 | mod->state = MODULE_STATE_LIVE; | |
3556 | blocking_notifier_call_chain(&module_notify_list, | |
3557 | MODULE_STATE_LIVE, mod); | |
3558 | ||
774a1221 TH |
3559 | /* |
3560 | * We need to finish all async code before the module init sequence | |
3561 | * is done. This has potential to deadlock. For example, a newly | |
3562 | * detected block device can trigger request_module() of the | |
3563 | * default iosched from async probing task. Once userland helper | |
3564 | * reaches here, async_synchronize_full() will wait on the async | |
3565 | * task waiting on request_module() and deadlock. | |
3566 | * | |
3567 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3568 | * iff module init queued any async jobs. This isn't a full | |
3569 | * solution as it will deadlock the same if module loading from | |
3570 | * async jobs nests more than once; however, due to the various | |
3571 | * constraints, this hack seems to be the best option for now. | |
3572 | * Please refer to the following thread for details. | |
3573 | * | |
3574 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3575 | */ | |
f2411da7 | 3576 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3577 | async_synchronize_full(); |
34e1169d | 3578 | |
aba4b5c2 | 3579 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3580 | mod->init_layout.size); |
34e1169d KC |
3581 | mutex_lock(&module_mutex); |
3582 | /* Drop initial reference. */ | |
3583 | module_put(mod); | |
3584 | trim_init_extable(mod); | |
3585 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3586 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3587 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3588 | #endif |
444d13ff | 3589 | module_enable_ro(mod, true); |
93c2e105 | 3590 | mod_tree_remove_init(mod); |
d453cded | 3591 | module_arch_freeing_init(mod); |
7523e4dc RR |
3592 | mod->init_layout.base = NULL; |
3593 | mod->init_layout.size = 0; | |
3594 | mod->init_layout.ro_size = 0; | |
444d13ff | 3595 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3596 | mod->init_layout.text_size = 0; |
c7496379 RR |
3597 | /* |
3598 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3599 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3600 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3601 | * path. module_memfree() cannot be called in an interrupt, so do the |
3602 | * work and call synchronize_rcu() in a work queue. | |
3603 | * | |
ae646f0b JH |
3604 | * Note that module_alloc() on most architectures creates W+X page |
3605 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3606 | * code such as mark_rodata_ro() which depends on those mappings to | |
3607 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3608 | * rcu_barrier() |
c7496379 | 3609 | */ |
1a7b7d92 RE |
3610 | if (llist_add(&freeinit->node, &init_free_list)) |
3611 | schedule_work(&init_free_wq); | |
3612 | ||
34e1169d KC |
3613 | mutex_unlock(&module_mutex); |
3614 | wake_up_all(&module_wq); | |
3615 | ||
3616 | return 0; | |
c7496379 RR |
3617 | |
3618 | fail_free_freeinit: | |
3619 | kfree(freeinit); | |
3620 | fail: | |
3621 | /* Try to protect us from buggy refcounters. */ | |
3622 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3623 | synchronize_rcu(); |
c7496379 RR |
3624 | module_put(mod); |
3625 | blocking_notifier_call_chain(&module_notify_list, | |
3626 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3627 | klp_module_going(mod); |
7dcd182b | 3628 | ftrace_release_mod(mod); |
c7496379 RR |
3629 | free_module(mod); |
3630 | wake_up_all(&module_wq); | |
3631 | return ret; | |
34e1169d KC |
3632 | } |
3633 | ||
3634 | static int may_init_module(void) | |
3635 | { | |
3636 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3637 | return -EPERM; | |
3638 | ||
3639 | return 0; | |
3640 | } | |
3641 | ||
a3535c7e RR |
3642 | /* |
3643 | * We try to place it in the list now to make sure it's unique before | |
3644 | * we dedicate too many resources. In particular, temporary percpu | |
3645 | * memory exhaustion. | |
3646 | */ | |
3647 | static int add_unformed_module(struct module *mod) | |
3648 | { | |
3649 | int err; | |
3650 | struct module *old; | |
3651 | ||
3652 | mod->state = MODULE_STATE_UNFORMED; | |
3653 | ||
3654 | again: | |
3655 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3656 | old = find_module_all(mod->name, strlen(mod->name), true); |
3657 | if (old != NULL) { | |
6e6de3de | 3658 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
3659 | /* Wait in case it fails to load. */ |
3660 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3661 | err = wait_event_interruptible(module_wq, |
3662 | finished_loading(mod->name)); | |
a3535c7e RR |
3663 | if (err) |
3664 | goto out_unlocked; | |
3665 | goto again; | |
3666 | } | |
3667 | err = -EEXIST; | |
3668 | goto out; | |
3669 | } | |
4f666546 | 3670 | mod_update_bounds(mod); |
a3535c7e | 3671 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3672 | mod_tree_insert(mod); |
a3535c7e RR |
3673 | err = 0; |
3674 | ||
3675 | out: | |
3676 | mutex_unlock(&module_mutex); | |
3677 | out_unlocked: | |
3678 | return err; | |
3679 | } | |
3680 | ||
3681 | static int complete_formation(struct module *mod, struct load_info *info) | |
3682 | { | |
3683 | int err; | |
3684 | ||
3685 | mutex_lock(&module_mutex); | |
3686 | ||
3687 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3688 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3689 | if (err < 0) |
3690 | goto out; | |
3691 | ||
3692 | /* This relies on module_mutex for list integrity. */ | |
3693 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3694 | ||
444d13ff | 3695 | module_enable_ro(mod, false); |
85c898db | 3696 | module_enable_nx(mod); |
af742623 | 3697 | module_enable_x(mod); |
4982223e | 3698 | |
a3535c7e RR |
3699 | /* Mark state as coming so strong_try_module_get() ignores us, |
3700 | * but kallsyms etc. can see us. */ | |
3701 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3702 | mutex_unlock(&module_mutex); |
3703 | ||
4982223e | 3704 | return 0; |
a3535c7e RR |
3705 | |
3706 | out: | |
3707 | mutex_unlock(&module_mutex); | |
3708 | return err; | |
3709 | } | |
3710 | ||
4c973d16 JY |
3711 | static int prepare_coming_module(struct module *mod) |
3712 | { | |
7e545d6e JY |
3713 | int err; |
3714 | ||
4c973d16 | 3715 | ftrace_module_enable(mod); |
7e545d6e JY |
3716 | err = klp_module_coming(mod); |
3717 | if (err) | |
3718 | return err; | |
3719 | ||
4c973d16 JY |
3720 | blocking_notifier_call_chain(&module_notify_list, |
3721 | MODULE_STATE_COMING, mod); | |
3722 | return 0; | |
3723 | } | |
3724 | ||
ecc86170 LR |
3725 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3726 | void *arg) | |
54041d8a | 3727 | { |
f2411da7 LR |
3728 | struct module *mod = arg; |
3729 | int ret; | |
3730 | ||
3731 | if (strcmp(param, "async_probe") == 0) { | |
3732 | mod->async_probe_requested = true; | |
3733 | return 0; | |
3734 | } | |
3735 | ||
6da0b565 | 3736 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3737 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3738 | if (ret != 0) |
3739 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3740 | return 0; |
3741 | } | |
3742 | ||
d913188c RR |
3743 | /* Allocate and load the module: note that size of section 0 is always |
3744 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3745 | static int load_module(struct load_info *info, const char __user *uargs, |
3746 | int flags) | |
d913188c | 3747 | { |
a3535c7e | 3748 | struct module *mod; |
5fdc7db6 | 3749 | long err = 0; |
51e158c1 | 3750 | char *after_dashes; |
d913188c | 3751 | |
5fdc7db6 JY |
3752 | err = elf_header_check(info); |
3753 | if (err) | |
3754 | goto free_copy; | |
3755 | ||
3756 | err = setup_load_info(info, flags); | |
3757 | if (err) | |
3758 | goto free_copy; | |
3759 | ||
3760 | if (blacklisted(info->name)) { | |
3761 | err = -EPERM; | |
3762 | goto free_copy; | |
3763 | } | |
3764 | ||
bca014ca | 3765 | err = module_sig_check(info, flags); |
34e1169d KC |
3766 | if (err) |
3767 | goto free_copy; | |
d913188c | 3768 | |
5fdc7db6 | 3769 | err = rewrite_section_headers(info, flags); |
d913188c | 3770 | if (err) |
34e1169d | 3771 | goto free_copy; |
d913188c | 3772 | |
5fdc7db6 JY |
3773 | /* Check module struct version now, before we try to use module. */ |
3774 | if (!check_modstruct_version(info, info->mod)) { | |
3775 | err = -ENOEXEC; | |
3776 | goto free_copy; | |
3777 | } | |
3778 | ||
d913188c | 3779 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3780 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3781 | if (IS_ERR(mod)) { |
3782 | err = PTR_ERR(mod); | |
d913188c | 3783 | goto free_copy; |
1da177e4 | 3784 | } |
1da177e4 | 3785 | |
ca86cad7 RGB |
3786 | audit_log_kern_module(mod->name); |
3787 | ||
a3535c7e RR |
3788 | /* Reserve our place in the list. */ |
3789 | err = add_unformed_module(mod); | |
3790 | if (err) | |
1fb9341a | 3791 | goto free_module; |
1fb9341a | 3792 | |
106a4ee2 | 3793 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3794 | mod->sig_ok = info->sig_ok; |
64748a2c | 3795 | if (!mod->sig_ok) { |
bddb12b3 | 3796 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3797 | "and/or required key missing - tainting " |
bddb12b3 | 3798 | "kernel\n", mod->name); |
66cc69e3 | 3799 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3800 | } |
106a4ee2 RR |
3801 | #endif |
3802 | ||
8d8022e8 | 3803 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3804 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3805 | if (err) |
3806 | goto unlink_mod; | |
3807 | ||
49668688 | 3808 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3809 | err = module_unload_init(mod); |
3810 | if (err) | |
1fb9341a | 3811 | goto unlink_mod; |
1da177e4 | 3812 | |
cf2fde7b | 3813 | init_param_lock(mod); |
b51d23e4 | 3814 | |
22e268eb RR |
3815 | /* Now we've got everything in the final locations, we can |
3816 | * find optional sections. */ | |
eb3057df FH |
3817 | err = find_module_sections(mod, info); |
3818 | if (err) | |
3819 | goto free_unload; | |
9b37ccfc | 3820 | |
49668688 | 3821 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3822 | if (err) |
3823 | goto free_unload; | |
9841d61d | 3824 | |
c988d2b2 | 3825 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3826 | setup_modinfo(mod, info); |
c988d2b2 | 3827 | |
1da177e4 | 3828 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3829 | err = simplify_symbols(mod, info); |
1da177e4 | 3830 | if (err < 0) |
d913188c | 3831 | goto free_modinfo; |
1da177e4 | 3832 | |
34e1169d | 3833 | err = apply_relocations(mod, info); |
22e268eb | 3834 | if (err < 0) |
d913188c | 3835 | goto free_modinfo; |
1da177e4 | 3836 | |
34e1169d | 3837 | err = post_relocation(mod, info); |
1da177e4 | 3838 | if (err < 0) |
d913188c | 3839 | goto free_modinfo; |
1da177e4 | 3840 | |
22e268eb | 3841 | flush_module_icache(mod); |
378bac82 | 3842 | |
6526c534 RR |
3843 | /* Now copy in args */ |
3844 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3845 | if (IS_ERR(mod->args)) { | |
3846 | err = PTR_ERR(mod->args); | |
3847 | goto free_arch_cleanup; | |
3848 | } | |
8d3b33f6 | 3849 | |
52796312 | 3850 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 3851 | |
a949ae56 SRRH |
3852 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3853 | ftrace_module_init(mod); | |
3854 | ||
a3535c7e RR |
3855 | /* Finally it's fully formed, ready to start executing. */ |
3856 | err = complete_formation(mod, info); | |
3857 | if (err) | |
1fb9341a | 3858 | goto ddebug_cleanup; |
be593f4c | 3859 | |
4c973d16 JY |
3860 | err = prepare_coming_module(mod); |
3861 | if (err) | |
3862 | goto bug_cleanup; | |
3863 | ||
51f3d0f4 | 3864 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3865 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3866 | -32768, 32767, mod, |
ecc86170 | 3867 | unknown_module_param_cb); |
51e158c1 RR |
3868 | if (IS_ERR(after_dashes)) { |
3869 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3870 | goto coming_cleanup; |
51e158c1 RR |
3871 | } else if (after_dashes) { |
3872 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3873 | mod->name, after_dashes); | |
3874 | } | |
1da177e4 | 3875 | |
ca86cad7 | 3876 | /* Link in to sysfs. */ |
34e1169d | 3877 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3878 | if (err < 0) |
4c973d16 | 3879 | goto coming_cleanup; |
80a3d1bb | 3880 | |
1ce15ef4 JY |
3881 | if (is_livepatch_module(mod)) { |
3882 | err = copy_module_elf(mod, info); | |
3883 | if (err < 0) | |
3884 | goto sysfs_cleanup; | |
3885 | } | |
3886 | ||
48fd1188 | 3887 | /* Get rid of temporary copy. */ |
34e1169d | 3888 | free_copy(info); |
1da177e4 LT |
3889 | |
3890 | /* Done! */ | |
51f3d0f4 | 3891 | trace_module_load(mod); |
34e1169d KC |
3892 | |
3893 | return do_init_module(mod); | |
1da177e4 | 3894 | |
1ce15ef4 JY |
3895 | sysfs_cleanup: |
3896 | mod_sysfs_teardown(mod); | |
4c973d16 | 3897 | coming_cleanup: |
885a78d4 | 3898 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3899 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3900 | blocking_notifier_call_chain(&module_notify_list, |
3901 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3902 | klp_module_going(mod); |
1fb9341a RR |
3903 | bug_cleanup: |
3904 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3905 | mutex_lock(&module_mutex); |
5336377d | 3906 | module_bug_cleanup(mod); |
ee61abb3 | 3907 | mutex_unlock(&module_mutex); |
ff7e0055 | 3908 | |
a3535c7e | 3909 | ddebug_cleanup: |
1323eac7 | 3910 | ftrace_release_mod(mod); |
52796312 | 3911 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 3912 | synchronize_rcu(); |
6526c534 RR |
3913 | kfree(mod->args); |
3914 | free_arch_cleanup: | |
1da177e4 | 3915 | module_arch_cleanup(mod); |
d913188c | 3916 | free_modinfo: |
a263f776 | 3917 | free_modinfo(mod); |
22e268eb | 3918 | free_unload: |
1da177e4 | 3919 | module_unload_free(mod); |
1fb9341a RR |
3920 | unlink_mod: |
3921 | mutex_lock(&module_mutex); | |
3922 | /* Unlink carefully: kallsyms could be walking list. */ | |
3923 | list_del_rcu(&mod->list); | |
758556bd | 3924 | mod_tree_remove(mod); |
1fb9341a | 3925 | wake_up_all(&module_wq); |
0be964be | 3926 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 3927 | synchronize_rcu(); |
1fb9341a | 3928 | mutex_unlock(&module_mutex); |
d913188c | 3929 | free_module: |
35a9393c | 3930 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3931 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3932 | |
34e1169d | 3933 | module_deallocate(mod, info); |
d913188c | 3934 | free_copy: |
34e1169d KC |
3935 | free_copy(info); |
3936 | return err; | |
b99b87f7 PO |
3937 | } |
3938 | ||
17da2bd9 HC |
3939 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3940 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3941 | { |
34e1169d KC |
3942 | int err; |
3943 | struct load_info info = { }; | |
1da177e4 | 3944 | |
34e1169d KC |
3945 | err = may_init_module(); |
3946 | if (err) | |
3947 | return err; | |
1da177e4 | 3948 | |
34e1169d KC |
3949 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3950 | umod, len, uargs); | |
1da177e4 | 3951 | |
34e1169d KC |
3952 | err = copy_module_from_user(umod, len, &info); |
3953 | if (err) | |
3954 | return err; | |
1da177e4 | 3955 | |
2f3238ae | 3956 | return load_module(&info, uargs, 0); |
34e1169d | 3957 | } |
94462ad3 | 3958 | |
2f3238ae | 3959 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3960 | { |
34e1169d | 3961 | struct load_info info = { }; |
a1db7420 MZ |
3962 | loff_t size; |
3963 | void *hdr; | |
3964 | int err; | |
94462ad3 | 3965 | |
34e1169d KC |
3966 | err = may_init_module(); |
3967 | if (err) | |
3968 | return err; | |
1da177e4 | 3969 | |
2f3238ae | 3970 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3971 | |
2f3238ae RR |
3972 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3973 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3974 | return -EINVAL; | |
d6de2c80 | 3975 | |
a1db7420 MZ |
3976 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
3977 | READING_MODULE); | |
34e1169d KC |
3978 | if (err) |
3979 | return err; | |
a1db7420 MZ |
3980 | info.hdr = hdr; |
3981 | info.len = size; | |
1da177e4 | 3982 | |
2f3238ae | 3983 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3984 | } |
3985 | ||
3986 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3987 | { | |
3988 | return ((void *)addr >= start && (void *)addr < start + size); | |
3989 | } | |
3990 | ||
3991 | #ifdef CONFIG_KALLSYMS | |
3992 | /* | |
3993 | * This ignores the intensely annoying "mapping symbols" found | |
3994 | * in ARM ELF files: $a, $t and $d. | |
3995 | */ | |
3996 | static inline int is_arm_mapping_symbol(const char *str) | |
3997 | { | |
2e3a10a1 RK |
3998 | if (str[0] == '.' && str[1] == 'L') |
3999 | return true; | |
6c34f1f5 | 4000 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
4001 | && (str[2] == '\0' || str[2] == '.'); |
4002 | } | |
4003 | ||
2d25bc55 | 4004 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 4005 | { |
8244062e | 4006 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
4007 | } |
4008 | ||
2d25bc55 JY |
4009 | /* |
4010 | * Given a module and address, find the corresponding symbol and return its name | |
4011 | * while providing its size and offset if needed. | |
4012 | */ | |
4013 | static const char *find_kallsyms_symbol(struct module *mod, | |
4014 | unsigned long addr, | |
4015 | unsigned long *size, | |
4016 | unsigned long *offset) | |
1da177e4 LT |
4017 | { |
4018 | unsigned int i, best = 0; | |
93d77e7f | 4019 | unsigned long nextval, bestval; |
8244062e | 4020 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
4021 | |
4022 | /* At worse, next value is at end of module */ | |
a06f6211 | 4023 | if (within_module_init(addr, mod)) |
7523e4dc | 4024 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 4025 | else |
7523e4dc | 4026 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 4027 | |
93d77e7f VW |
4028 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
4029 | ||
25985edc | 4030 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 4031 | starts real symbols at 1). */ |
8244062e | 4032 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
4033 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
4034 | unsigned long thisval = kallsyms_symbol_value(sym); | |
4035 | ||
4036 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
4037 | continue; |
4038 | ||
4039 | /* We ignore unnamed symbols: they're uninformative | |
4040 | * and inserted at a whim. */ | |
2d25bc55 JY |
4041 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
4042 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
4043 | continue; |
4044 | ||
93d77e7f | 4045 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 4046 | best = i; |
93d77e7f VW |
4047 | bestval = thisval; |
4048 | } | |
4049 | if (thisval > addr && thisval < nextval) | |
4050 | nextval = thisval; | |
1da177e4 LT |
4051 | } |
4052 | ||
4053 | if (!best) | |
4054 | return NULL; | |
4055 | ||
ffb45122 | 4056 | if (size) |
93d77e7f | 4057 | *size = nextval - bestval; |
ffb45122 | 4058 | if (offset) |
93d77e7f | 4059 | *offset = addr - bestval; |
2d25bc55 JY |
4060 | |
4061 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
4062 | } |
4063 | ||
b865ea64 SS |
4064 | void * __weak dereference_module_function_descriptor(struct module *mod, |
4065 | void *ptr) | |
4066 | { | |
4067 | return ptr; | |
4068 | } | |
4069 | ||
6dd06c9f RR |
4070 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
4071 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 4072 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
4073 | unsigned long *size, |
4074 | unsigned long *offset, | |
4075 | char **modname, | |
4076 | char *namebuf) | |
1da177e4 | 4077 | { |
cb2a5205 | 4078 | const char *ret = NULL; |
b7df4d1b | 4079 | struct module *mod; |
1da177e4 | 4080 | |
cb2a5205 | 4081 | preempt_disable(); |
b7df4d1b PZ |
4082 | mod = __module_address(addr); |
4083 | if (mod) { | |
4084 | if (modname) | |
4085 | *modname = mod->name; | |
2d25bc55 JY |
4086 | |
4087 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4088 | } |
6dd06c9f RR |
4089 | /* Make a copy in here where it's safe */ |
4090 | if (ret) { | |
4091 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4092 | ret = namebuf; | |
4093 | } | |
cb2a5205 | 4094 | preempt_enable(); |
b7df4d1b | 4095 | |
92dfc9dc | 4096 | return ret; |
1da177e4 LT |
4097 | } |
4098 | ||
9d65cb4a AD |
4099 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4100 | { | |
4101 | struct module *mod; | |
4102 | ||
cb2a5205 | 4103 | preempt_disable(); |
d72b3751 | 4104 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4105 | if (mod->state == MODULE_STATE_UNFORMED) |
4106 | continue; | |
9b20a352 | 4107 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4108 | const char *sym; |
4109 | ||
2d25bc55 | 4110 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4111 | if (!sym) |
4112 | goto out; | |
2d25bc55 | 4113 | |
9281acea | 4114 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4115 | preempt_enable(); |
9d65cb4a AD |
4116 | return 0; |
4117 | } | |
4118 | } | |
4119 | out: | |
cb2a5205 | 4120 | preempt_enable(); |
9d65cb4a AD |
4121 | return -ERANGE; |
4122 | } | |
4123 | ||
a5c43dae AD |
4124 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4125 | unsigned long *offset, char *modname, char *name) | |
4126 | { | |
4127 | struct module *mod; | |
4128 | ||
cb2a5205 | 4129 | preempt_disable(); |
d72b3751 | 4130 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4131 | if (mod->state == MODULE_STATE_UNFORMED) |
4132 | continue; | |
9b20a352 | 4133 | if (within_module(addr, mod)) { |
a5c43dae AD |
4134 | const char *sym; |
4135 | ||
2d25bc55 | 4136 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4137 | if (!sym) |
4138 | goto out; | |
4139 | if (modname) | |
9281acea | 4140 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4141 | if (name) |
9281acea | 4142 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4143 | preempt_enable(); |
a5c43dae AD |
4144 | return 0; |
4145 | } | |
4146 | } | |
4147 | out: | |
cb2a5205 | 4148 | preempt_enable(); |
a5c43dae AD |
4149 | return -ERANGE; |
4150 | } | |
4151 | ||
ea07890a AD |
4152 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4153 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4154 | { |
4155 | struct module *mod; | |
4156 | ||
cb2a5205 | 4157 | preempt_disable(); |
d72b3751 | 4158 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4159 | struct mod_kallsyms *kallsyms; |
4160 | ||
0d21b0e3 RR |
4161 | if (mod->state == MODULE_STATE_UNFORMED) |
4162 | continue; | |
8244062e RR |
4163 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4164 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4165 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4166 | ||
4167 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4168 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4169 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4170 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4171 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4172 | preempt_enable(); |
ea07890a | 4173 | return 0; |
1da177e4 | 4174 | } |
8244062e | 4175 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4176 | } |
cb2a5205 | 4177 | preempt_enable(); |
ea07890a | 4178 | return -ERANGE; |
1da177e4 LT |
4179 | } |
4180 | ||
2d25bc55 JY |
4181 | /* Given a module and name of symbol, find and return the symbol's value */ |
4182 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4183 | { |
4184 | unsigned int i; | |
8244062e | 4185 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4186 | |
93d77e7f VW |
4187 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4188 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4189 | ||
2d25bc55 | 4190 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4191 | sym->st_shndx != SHN_UNDEF) |
4192 | return kallsyms_symbol_value(sym); | |
4193 | } | |
1da177e4 LT |
4194 | return 0; |
4195 | } | |
4196 | ||
4197 | /* Look for this name: can be of form module:name. */ | |
4198 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4199 | { | |
4200 | struct module *mod; | |
4201 | char *colon; | |
4202 | unsigned long ret = 0; | |
4203 | ||
4204 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4205 | preempt_disable(); |
17586188 | 4206 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4207 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4208 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4209 | } else { |
0d21b0e3 RR |
4210 | list_for_each_entry_rcu(mod, &modules, list) { |
4211 | if (mod->state == MODULE_STATE_UNFORMED) | |
4212 | continue; | |
2d25bc55 | 4213 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4214 | break; |
0d21b0e3 | 4215 | } |
1da177e4 | 4216 | } |
cb2a5205 | 4217 | preempt_enable(); |
1da177e4 LT |
4218 | return ret; |
4219 | } | |
75a66614 AK |
4220 | |
4221 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4222 | struct module *, unsigned long), | |
4223 | void *data) | |
4224 | { | |
4225 | struct module *mod; | |
4226 | unsigned int i; | |
4227 | int ret; | |
4228 | ||
0be964be PZ |
4229 | module_assert_mutex(); |
4230 | ||
75a66614 | 4231 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4232 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4233 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4234 | ||
0d21b0e3 RR |
4235 | if (mod->state == MODULE_STATE_UNFORMED) |
4236 | continue; | |
8244062e | 4237 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4238 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4239 | |
93d77e7f | 4240 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4241 | continue; |
4242 | ||
2d25bc55 | 4243 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4244 | mod, kallsyms_symbol_value(sym)); |
75a66614 AK |
4245 | if (ret != 0) |
4246 | return ret; | |
4247 | } | |
4248 | } | |
4249 | return 0; | |
4250 | } | |
1da177e4 LT |
4251 | #endif /* CONFIG_KALLSYMS */ |
4252 | ||
7fd8329b PM |
4253 | /* Maximum number of characters written by module_flags() */ |
4254 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4255 | ||
4256 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4257 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4258 | { |
4259 | int bx = 0; | |
4260 | ||
0d21b0e3 | 4261 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4262 | if (mod->taints || |
4263 | mod->state == MODULE_STATE_GOING || | |
4264 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4265 | buf[bx++] = '('; |
cca3e707 | 4266 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4267 | /* Show a - for module-is-being-unloaded */ |
4268 | if (mod->state == MODULE_STATE_GOING) | |
4269 | buf[bx++] = '-'; | |
4270 | /* Show a + for module-is-being-loaded */ | |
4271 | if (mod->state == MODULE_STATE_COMING) | |
4272 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4273 | buf[bx++] = ')'; |
4274 | } | |
4275 | buf[bx] = '\0'; | |
4276 | ||
4277 | return buf; | |
4278 | } | |
4279 | ||
3b5d5c6b AD |
4280 | #ifdef CONFIG_PROC_FS |
4281 | /* Called by the /proc file system to return a list of modules. */ | |
4282 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4283 | { | |
4284 | mutex_lock(&module_mutex); | |
4285 | return seq_list_start(&modules, *pos); | |
4286 | } | |
4287 | ||
4288 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4289 | { | |
4290 | return seq_list_next(p, &modules, pos); | |
4291 | } | |
4292 | ||
4293 | static void m_stop(struct seq_file *m, void *p) | |
4294 | { | |
4295 | mutex_unlock(&module_mutex); | |
4296 | } | |
4297 | ||
1da177e4 LT |
4298 | static int m_show(struct seq_file *m, void *p) |
4299 | { | |
4300 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4301 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4302 | void *value; |
fa3ba2e8 | 4303 | |
0d21b0e3 RR |
4304 | /* We always ignore unformed modules. */ |
4305 | if (mod->state == MODULE_STATE_UNFORMED) | |
4306 | return 0; | |
4307 | ||
2f0f2a33 | 4308 | seq_printf(m, "%s %u", |
7523e4dc | 4309 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4310 | print_unload_info(m, mod); |
4311 | ||
4312 | /* Informative for users. */ | |
4313 | seq_printf(m, " %s", | |
6da0b565 IA |
4314 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4315 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4316 | "Live"); |
4317 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4318 | value = m->private ? NULL : mod->core_layout.base; |
4319 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4320 | |
fa3ba2e8 FM |
4321 | /* Taints info */ |
4322 | if (mod->taints) | |
21aa9280 | 4323 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4324 | |
6da0b565 | 4325 | seq_puts(m, "\n"); |
1da177e4 LT |
4326 | return 0; |
4327 | } | |
4328 | ||
4329 | /* Format: modulename size refcount deps address | |
4330 | ||
4331 | Where refcount is a number or -, and deps is a comma-separated list | |
4332 | of depends or -. | |
4333 | */ | |
3b5d5c6b | 4334 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4335 | .start = m_start, |
4336 | .next = m_next, | |
4337 | .stop = m_stop, | |
4338 | .show = m_show | |
4339 | }; | |
4340 | ||
516fb7f2 LT |
4341 | /* |
4342 | * This also sets the "private" pointer to non-NULL if the | |
4343 | * kernel pointers should be hidden (so you can just test | |
4344 | * "m->private" to see if you should keep the values private). | |
4345 | * | |
4346 | * We use the same logic as for /proc/kallsyms. | |
4347 | */ | |
3b5d5c6b AD |
4348 | static int modules_open(struct inode *inode, struct file *file) |
4349 | { | |
516fb7f2 LT |
4350 | int err = seq_open(file, &modules_op); |
4351 | ||
4352 | if (!err) { | |
4353 | struct seq_file *m = file->private_data; | |
4354 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; | |
4355 | } | |
4356 | ||
3f553b30 | 4357 | return err; |
3b5d5c6b AD |
4358 | } |
4359 | ||
97a32539 | 4360 | static const struct proc_ops modules_proc_ops = { |
d919b33d | 4361 | .proc_flags = PROC_ENTRY_PERMANENT, |
97a32539 AD |
4362 | .proc_open = modules_open, |
4363 | .proc_read = seq_read, | |
4364 | .proc_lseek = seq_lseek, | |
4365 | .proc_release = seq_release, | |
3b5d5c6b AD |
4366 | }; |
4367 | ||
4368 | static int __init proc_modules_init(void) | |
4369 | { | |
97a32539 | 4370 | proc_create("modules", 0, NULL, &modules_proc_ops); |
3b5d5c6b AD |
4371 | return 0; |
4372 | } | |
4373 | module_init(proc_modules_init); | |
4374 | #endif | |
4375 | ||
1da177e4 LT |
4376 | /* Given an address, look for it in the module exception tables. */ |
4377 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4378 | { | |
1da177e4 LT |
4379 | const struct exception_table_entry *e = NULL; |
4380 | struct module *mod; | |
4381 | ||
24da1cbf | 4382 | preempt_disable(); |
5ff22646 PZ |
4383 | mod = __module_address(addr); |
4384 | if (!mod) | |
4385 | goto out; | |
22a8bdeb | 4386 | |
5ff22646 PZ |
4387 | if (!mod->num_exentries) |
4388 | goto out; | |
4389 | ||
4390 | e = search_extable(mod->extable, | |
a94c33dd | 4391 | mod->num_exentries, |
5ff22646 PZ |
4392 | addr); |
4393 | out: | |
24da1cbf | 4394 | preempt_enable(); |
1da177e4 | 4395 | |
5ff22646 PZ |
4396 | /* |
4397 | * Now, if we found one, we are running inside it now, hence | |
4398 | * we cannot unload the module, hence no refcnt needed. | |
4399 | */ | |
1da177e4 LT |
4400 | return e; |
4401 | } | |
4402 | ||
4d435f9d | 4403 | /* |
e610499e RR |
4404 | * is_module_address - is this address inside a module? |
4405 | * @addr: the address to check. | |
4406 | * | |
4407 | * See is_module_text_address() if you simply want to see if the address | |
4408 | * is code (not data). | |
4d435f9d | 4409 | */ |
e610499e | 4410 | bool is_module_address(unsigned long addr) |
4d435f9d | 4411 | { |
e610499e | 4412 | bool ret; |
4d435f9d | 4413 | |
24da1cbf | 4414 | preempt_disable(); |
e610499e | 4415 | ret = __module_address(addr) != NULL; |
24da1cbf | 4416 | preempt_enable(); |
4d435f9d | 4417 | |
e610499e | 4418 | return ret; |
4d435f9d IM |
4419 | } |
4420 | ||
e610499e RR |
4421 | /* |
4422 | * __module_address - get the module which contains an address. | |
4423 | * @addr: the address. | |
4424 | * | |
4425 | * Must be called with preempt disabled or module mutex held so that | |
4426 | * module doesn't get freed during this. | |
4427 | */ | |
714f83d5 | 4428 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4429 | { |
4430 | struct module *mod; | |
4431 | ||
3a642e99 RR |
4432 | if (addr < module_addr_min || addr > module_addr_max) |
4433 | return NULL; | |
4434 | ||
0be964be PZ |
4435 | module_assert_mutex_or_preempt(); |
4436 | ||
6c9692e2 | 4437 | mod = mod_find(addr); |
93c2e105 PZ |
4438 | if (mod) { |
4439 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4440 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4441 | mod = NULL; |
0d21b0e3 | 4442 | } |
93c2e105 | 4443 | return mod; |
1da177e4 | 4444 | } |
c6b37801 | 4445 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4446 | |
e610499e RR |
4447 | /* |
4448 | * is_module_text_address - is this address inside module code? | |
4449 | * @addr: the address to check. | |
4450 | * | |
4451 | * See is_module_address() if you simply want to see if the address is | |
4452 | * anywhere in a module. See kernel_text_address() for testing if an | |
4453 | * address corresponds to kernel or module code. | |
4454 | */ | |
4455 | bool is_module_text_address(unsigned long addr) | |
4456 | { | |
4457 | bool ret; | |
4458 | ||
4459 | preempt_disable(); | |
4460 | ret = __module_text_address(addr) != NULL; | |
4461 | preempt_enable(); | |
4462 | ||
4463 | return ret; | |
4464 | } | |
4465 | ||
4466 | /* | |
4467 | * __module_text_address - get the module whose code contains an address. | |
4468 | * @addr: the address. | |
4469 | * | |
4470 | * Must be called with preempt disabled or module mutex held so that | |
4471 | * module doesn't get freed during this. | |
4472 | */ | |
4473 | struct module *__module_text_address(unsigned long addr) | |
4474 | { | |
4475 | struct module *mod = __module_address(addr); | |
4476 | if (mod) { | |
4477 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4478 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4479 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4480 | mod = NULL; |
4481 | } | |
4482 | return mod; | |
4483 | } | |
c6b37801 | 4484 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4485 | |
1da177e4 LT |
4486 | /* Don't grab lock, we're oopsing. */ |
4487 | void print_modules(void) | |
4488 | { | |
4489 | struct module *mod; | |
7fd8329b | 4490 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4491 | |
b231125a | 4492 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4493 | /* Most callers should already have preempt disabled, but make sure */ |
4494 | preempt_disable(); | |
0d21b0e3 RR |
4495 | list_for_each_entry_rcu(mod, &modules, list) { |
4496 | if (mod->state == MODULE_STATE_UNFORMED) | |
4497 | continue; | |
27bba4d6 | 4498 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4499 | } |
d72b3751 | 4500 | preempt_enable(); |
e14af7ee | 4501 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4502 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4503 | pr_cont("\n"); | |
1da177e4 LT |
4504 | } |
4505 | ||
1da177e4 | 4506 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4507 | /* Generate the signature for all relevant module structures here. |
4508 | * If these change, we don't want to try to parse the module. */ | |
4509 | void module_layout(struct module *mod, | |
4510 | struct modversion_info *ver, | |
4511 | struct kernel_param *kp, | |
4512 | struct kernel_symbol *ks, | |
65498646 | 4513 | struct tracepoint * const *tp) |
8c8ef42a RR |
4514 | { |
4515 | } | |
4516 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4517 | #endif |