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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f71d20e9 | 2 | /* |
24b9f0d2 SS |
3 | * Copyright (C) 2002 Richard Henderson |
4 | * Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. | |
5 | */ | |
51161bfc LR |
6 | |
7 | #define INCLUDE_VERMAGIC | |
8 | ||
9984de1a | 9 | #include <linux/export.h> |
8a293be0 | 10 | #include <linux/extable.h> |
1da177e4 | 11 | #include <linux/moduleloader.h> |
c8424e77 | 12 | #include <linux/module_signature.h> |
af658dca | 13 | #include <linux/trace_events.h> |
1da177e4 | 14 | #include <linux/init.h> |
ae84e324 | 15 | #include <linux/kallsyms.h> |
34e1169d | 16 | #include <linux/file.h> |
3b5d5c6b | 17 | #include <linux/fs.h> |
6d760133 | 18 | #include <linux/sysfs.h> |
9f158333 | 19 | #include <linux/kernel.h> |
b89999d0 | 20 | #include <linux/kernel_read_file.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. | |
24b9f0d2 SS |
88 | * (delete and add uses RCU list operations). |
89 | */ | |
922f2a7c | 90 | static DEFINE_MUTEX(module_mutex); |
1da177e4 | 91 | static LIST_HEAD(modules); |
67fc4e0c | 92 | |
1a7b7d92 | 93 | /* Work queue for freeing init sections in success case */ |
fdf09ab8 DJ |
94 | static void do_free_init(struct work_struct *w); |
95 | static DECLARE_WORK(init_free_wq, do_free_init); | |
96 | static LLIST_HEAD(init_free_list); | |
1a7b7d92 | 97 | |
6c9692e2 | 98 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 99 | |
93c2e105 PZ |
100 | /* |
101 | * Use a latched RB-tree for __module_address(); this allows us to use | |
102 | * RCU-sched lookups of the address from any context. | |
103 | * | |
6c9692e2 PZ |
104 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
105 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
106 | * NMI context. | |
93c2e105 PZ |
107 | */ |
108 | ||
109 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 110 | { |
7523e4dc | 111 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 112 | |
7523e4dc | 113 | return (unsigned long)layout->base; |
93c2e105 PZ |
114 | } |
115 | ||
116 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
117 | { | |
7523e4dc | 118 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 119 | |
7523e4dc | 120 | return (unsigned long)layout->size; |
93c2e105 PZ |
121 | } |
122 | ||
123 | static __always_inline bool | |
124 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
125 | { | |
126 | return __mod_tree_val(a) < __mod_tree_val(b); | |
127 | } | |
128 | ||
129 | static __always_inline int | |
130 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
131 | { | |
132 | unsigned long val = (unsigned long)key; | |
133 | unsigned long start, end; | |
134 | ||
135 | start = __mod_tree_val(n); | |
136 | if (val < start) | |
137 | return -1; | |
138 | ||
139 | end = start + __mod_tree_size(n); | |
140 | if (val >= end) | |
141 | return 1; | |
106a4ee2 | 142 | |
106a4ee2 RR |
143 | return 0; |
144 | } | |
145 | ||
93c2e105 PZ |
146 | static const struct latch_tree_ops mod_tree_ops = { |
147 | .less = mod_tree_less, | |
148 | .comp = mod_tree_comp, | |
149 | }; | |
150 | ||
4f666546 PZ |
151 | static struct mod_tree_root { |
152 | struct latch_tree_root root; | |
153 | unsigned long addr_min; | |
154 | unsigned long addr_max; | |
155 | } mod_tree __cacheline_aligned = { | |
156 | .addr_min = -1UL, | |
106a4ee2 | 157 | }; |
106a4ee2 | 158 | |
4f666546 PZ |
159 | #define module_addr_min mod_tree.addr_min |
160 | #define module_addr_max mod_tree.addr_max | |
161 | ||
162 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
163 | { | |
164 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
165 | } | |
166 | ||
167 | static void __mod_tree_remove(struct mod_tree_node *node) | |
168 | { | |
169 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
170 | } | |
93c2e105 PZ |
171 | |
172 | /* | |
173 | * These modifications: insert, remove_init and remove; are serialized by the | |
174 | * module_mutex. | |
175 | */ | |
176 | static void mod_tree_insert(struct module *mod) | |
177 | { | |
7523e4dc RR |
178 | mod->core_layout.mtn.mod = mod; |
179 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 180 | |
7523e4dc RR |
181 | __mod_tree_insert(&mod->core_layout.mtn); |
182 | if (mod->init_layout.size) | |
183 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
184 | } |
185 | ||
186 | static void mod_tree_remove_init(struct module *mod) | |
187 | { | |
7523e4dc RR |
188 | if (mod->init_layout.size) |
189 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
190 | } |
191 | ||
192 | static void mod_tree_remove(struct module *mod) | |
193 | { | |
7523e4dc | 194 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
195 | mod_tree_remove_init(mod); |
196 | } | |
197 | ||
6c9692e2 | 198 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
199 | { |
200 | struct latch_tree_node *ltn; | |
201 | ||
4f666546 | 202 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
203 | if (!ltn) |
204 | return NULL; | |
205 | ||
206 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
207 | } | |
208 | ||
6c9692e2 PZ |
209 | #else /* MODULES_TREE_LOOKUP */ |
210 | ||
4f666546 PZ |
211 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
212 | ||
6c9692e2 PZ |
213 | static void mod_tree_insert(struct module *mod) { } |
214 | static void mod_tree_remove_init(struct module *mod) { } | |
215 | static void mod_tree_remove(struct module *mod) { } | |
216 | ||
217 | static struct module *mod_find(unsigned long addr) | |
218 | { | |
219 | struct module *mod; | |
220 | ||
bf08949c MH |
221 | list_for_each_entry_rcu(mod, &modules, list, |
222 | lockdep_is_held(&module_mutex)) { | |
6c9692e2 PZ |
223 | if (within_module(addr, mod)) |
224 | return mod; | |
225 | } | |
226 | ||
227 | return NULL; | |
228 | } | |
229 | ||
230 | #endif /* MODULES_TREE_LOOKUP */ | |
231 | ||
4f666546 PZ |
232 | /* |
233 | * Bounds of module text, for speeding up __module_address. | |
234 | * Protected by module_mutex. | |
235 | */ | |
236 | static void __mod_update_bounds(void *base, unsigned int size) | |
237 | { | |
238 | unsigned long min = (unsigned long)base; | |
239 | unsigned long max = min + size; | |
240 | ||
241 | if (min < module_addr_min) | |
242 | module_addr_min = min; | |
243 | if (max > module_addr_max) | |
244 | module_addr_max = max; | |
245 | } | |
246 | ||
247 | static void mod_update_bounds(struct module *mod) | |
248 | { | |
7523e4dc RR |
249 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
250 | if (mod->init_layout.size) | |
251 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
252 | } |
253 | ||
67fc4e0c JW |
254 | #ifdef CONFIG_KGDB_KDB |
255 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
256 | #endif /* CONFIG_KGDB_KDB */ | |
257 | ||
0be964be PZ |
258 | static void module_assert_mutex_or_preempt(void) |
259 | { | |
260 | #ifdef CONFIG_LOCKDEP | |
261 | if (unlikely(!debug_locks)) | |
262 | return; | |
263 | ||
9502514f | 264 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
265 | !lockdep_is_held(&module_mutex)); |
266 | #endif | |
267 | } | |
268 | ||
0c18f29a | 269 | #ifdef CONFIG_MODULE_SIG |
6727bb9c | 270 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
106a4ee2 | 271 | module_param(sig_enforce, bool_enable_only, 0644); |
1da177e4 | 272 | |
0c18f29a MZ |
273 | void set_module_sig_enforced(void) |
274 | { | |
275 | sig_enforce = true; | |
276 | } | |
277 | #else | |
278 | #define sig_enforce false | |
279 | #endif | |
280 | ||
fda784e5 BM |
281 | /* |
282 | * Export sig_enforce kernel cmdline parameter to allow other subsystems rely | |
283 | * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. | |
284 | */ | |
285 | bool is_module_sig_enforced(void) | |
286 | { | |
287 | return sig_enforce; | |
288 | } | |
289 | EXPORT_SYMBOL(is_module_sig_enforced); | |
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 | ||
36e68442 AN |
381 | /* Find a module section: 0 means not found. Ignores SHF_ALLOC flag. */ |
382 | static unsigned int find_any_sec(const struct load_info *info, const char *name) | |
383 | { | |
384 | unsigned int i; | |
385 | ||
386 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
387 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
388 | if (strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
389 | return i; | |
390 | } | |
391 | return 0; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Find a module section, or NULL. Fill in number of "objects" in section. | |
396 | * Ignores SHF_ALLOC flag. | |
397 | */ | |
398 | static __maybe_unused void *any_section_objs(const struct load_info *info, | |
399 | const char *name, | |
400 | size_t object_size, | |
401 | unsigned int *num) | |
402 | { | |
403 | unsigned int sec = find_any_sec(info, name); | |
404 | ||
405 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
406 | *num = info->sechdrs[sec].sh_size / object_size; | |
407 | return (void *)info->sechdrs[sec].sh_addr; | |
408 | } | |
409 | ||
1da177e4 LT |
410 | /* Provided by the linker */ |
411 | extern const struct kernel_symbol __start___ksymtab[]; | |
412 | extern const struct kernel_symbol __stop___ksymtab[]; | |
413 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
414 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
71810db2 AB |
415 | extern const s32 __start___kcrctab[]; |
416 | extern const s32 __start___kcrctab_gpl[]; | |
1da177e4 LT |
417 | |
418 | #ifndef CONFIG_MODVERSIONS | |
419 | #define symversion(base, idx) NULL | |
420 | #else | |
f83ca9fe | 421 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
422 | #endif |
423 | ||
00cc2c1c CH |
424 | struct symsearch { |
425 | const struct kernel_symbol *start, *stop; | |
426 | const s32 *crcs; | |
427 | enum mod_license { | |
428 | NOT_GPL_ONLY, | |
429 | GPL_ONLY, | |
00cc2c1c | 430 | } license; |
00cc2c1c CH |
431 | }; |
432 | ||
dafd0940 RR |
433 | struct find_symbol_arg { |
434 | /* Input */ | |
435 | const char *name; | |
436 | bool gplok; | |
437 | bool warn; | |
438 | ||
439 | /* Output */ | |
440 | struct module *owner; | |
71810db2 | 441 | const s32 *crc; |
414fd31b | 442 | const struct kernel_symbol *sym; |
ef1dac60 | 443 | enum mod_license license; |
dafd0940 RR |
444 | }; |
445 | ||
2d25bc55 JY |
446 | static bool check_exported_symbol(const struct symsearch *syms, |
447 | struct module *owner, | |
448 | unsigned int symnum, void *data) | |
dafd0940 RR |
449 | { |
450 | struct find_symbol_arg *fsa = data; | |
451 | ||
f1c3d73e CH |
452 | if (!fsa->gplok && syms->license == GPL_ONLY) |
453 | return false; | |
dafd0940 RR |
454 | fsa->owner = owner; |
455 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 456 | fsa->sym = &syms->start[symnum]; |
ef1dac60 | 457 | fsa->license = syms->license; |
dafd0940 RR |
458 | return true; |
459 | } | |
460 | ||
7290d580 AB |
461 | static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
462 | { | |
463 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
464 | return (unsigned long)offset_to_ptr(&sym->value_offset); | |
465 | #else | |
466 | return sym->value; | |
467 | #endif | |
468 | } | |
469 | ||
470 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) | |
471 | { | |
472 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
473 | return offset_to_ptr(&sym->name_offset); | |
474 | #else | |
475 | return sym->name; | |
476 | #endif | |
477 | } | |
478 | ||
8651ec01 MM |
479 | static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
480 | { | |
481 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
069e1c07 WD |
482 | if (!sym->namespace_offset) |
483 | return NULL; | |
8651ec01 MM |
484 | return offset_to_ptr(&sym->namespace_offset); |
485 | #else | |
486 | return sym->namespace; | |
487 | #endif | |
488 | } | |
489 | ||
b605be65 | 490 | static int cmp_name(const void *name, const void *sym) |
403ed278 | 491 | { |
b605be65 | 492 | return strcmp(name, kernel_symbol_name(sym)); |
403ed278 AIB |
493 | } |
494 | ||
2d25bc55 JY |
495 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
496 | struct module *owner, | |
497 | void *data) | |
de4d8d53 RR |
498 | { |
499 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
500 | struct kernel_symbol *sym; |
501 | ||
502 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
503 | sizeof(struct kernel_symbol), cmp_name); | |
504 | ||
2d25bc55 JY |
505 | if (sym != NULL && check_exported_symbol(syms, owner, |
506 | sym - syms->start, data)) | |
403ed278 | 507 | return true; |
de4d8d53 | 508 | |
de4d8d53 RR |
509 | return false; |
510 | } | |
511 | ||
24b9f0d2 SS |
512 | /* |
513 | * Find an exported symbol and return it, along with, (optional) crc and | |
514 | * (optional) module which owns it. Needs preempt disabled or module_mutex. | |
515 | */ | |
0b96615c | 516 | static bool find_symbol(struct find_symbol_arg *fsa) |
dafd0940 | 517 | { |
71e4b309 CH |
518 | static const struct symsearch arr[] = { |
519 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, | |
36794822 | 520 | NOT_GPL_ONLY }, |
71e4b309 CH |
521 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
522 | __start___kcrctab_gpl, | |
36794822 | 523 | GPL_ONLY }, |
71e4b309 | 524 | }; |
71e4b309 CH |
525 | struct module *mod; |
526 | unsigned int i; | |
dafd0940 | 527 | |
71e4b309 | 528 | module_assert_mutex_or_preempt(); |
dafd0940 | 529 | |
71e4b309 | 530 | for (i = 0; i < ARRAY_SIZE(arr); i++) |
0b96615c CH |
531 | if (find_exported_symbol_in_section(&arr[i], NULL, fsa)) |
532 | return true; | |
71e4b309 CH |
533 | |
534 | list_for_each_entry_rcu(mod, &modules, list, | |
535 | lockdep_is_held(&module_mutex)) { | |
536 | struct symsearch arr[] = { | |
537 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
36794822 | 538 | NOT_GPL_ONLY }, |
71e4b309 CH |
539 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
540 | mod->gpl_crcs, | |
36794822 | 541 | GPL_ONLY }, |
71e4b309 CH |
542 | }; |
543 | ||
544 | if (mod->state == MODULE_STATE_UNFORMED) | |
545 | continue; | |
546 | ||
547 | for (i = 0; i < ARRAY_SIZE(arr); i++) | |
0b96615c CH |
548 | if (find_exported_symbol_in_section(&arr[i], mod, fsa)) |
549 | return true; | |
dafd0940 RR |
550 | } |
551 | ||
0b96615c CH |
552 | pr_debug("Failed to find symbol %s\n", fsa->name); |
553 | return false; | |
1da177e4 LT |
554 | } |
555 | ||
fe0d34d2 RR |
556 | /* |
557 | * Search for module by name: must hold module_mutex (or preempt disabled | |
558 | * for read-only access). | |
559 | */ | |
4f6de4d5 | 560 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 561 | bool even_unformed) |
1da177e4 LT |
562 | { |
563 | struct module *mod; | |
564 | ||
fe0d34d2 | 565 | module_assert_mutex_or_preempt(); |
0be964be | 566 | |
bf08949c MH |
567 | list_for_each_entry_rcu(mod, &modules, list, |
568 | lockdep_is_held(&module_mutex)) { | |
0d21b0e3 RR |
569 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
570 | continue; | |
4f6de4d5 | 571 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
572 | return mod; |
573 | } | |
574 | return NULL; | |
575 | } | |
0d21b0e3 RR |
576 | |
577 | struct module *find_module(const char *name) | |
578 | { | |
4f6de4d5 | 579 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 580 | } |
1da177e4 LT |
581 | |
582 | #ifdef CONFIG_SMP | |
fbf59bc9 | 583 | |
259354de | 584 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 585 | { |
259354de TH |
586 | return mod->percpu; |
587 | } | |
fbf59bc9 | 588 | |
9eb76d77 | 589 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 590 | { |
9eb76d77 RR |
591 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
592 | unsigned long align = pcpusec->sh_addralign; | |
593 | ||
594 | if (!pcpusec->sh_size) | |
595 | return 0; | |
596 | ||
fbf59bc9 | 597 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
598 | pr_warn("%s: per-cpu alignment %li > %li\n", |
599 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
600 | align = PAGE_SIZE; |
601 | } | |
602 | ||
9eb76d77 | 603 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 604 | if (!mod->percpu) { |
bddb12b3 AM |
605 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
606 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
607 | return -ENOMEM; |
608 | } | |
9eb76d77 | 609 | mod->percpu_size = pcpusec->sh_size; |
259354de | 610 | return 0; |
fbf59bc9 TH |
611 | } |
612 | ||
259354de | 613 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 614 | { |
259354de | 615 | free_percpu(mod->percpu); |
fbf59bc9 TH |
616 | } |
617 | ||
49668688 | 618 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 619 | { |
49668688 | 620 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
621 | } |
622 | ||
259354de TH |
623 | static void percpu_modcopy(struct module *mod, |
624 | const void *from, unsigned long size) | |
6b588c18 TH |
625 | { |
626 | int cpu; | |
627 | ||
628 | for_each_possible_cpu(cpu) | |
259354de | 629 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
630 | } |
631 | ||
383776fa | 632 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
633 | { |
634 | struct module *mod; | |
635 | unsigned int cpu; | |
636 | ||
637 | preempt_disable(); | |
638 | ||
639 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
640 | if (mod->state == MODULE_STATE_UNFORMED) |
641 | continue; | |
10fad5e4 TH |
642 | if (!mod->percpu_size) |
643 | continue; | |
644 | for_each_possible_cpu(cpu) { | |
645 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 646 | void *va = (void *)addr; |
10fad5e4 | 647 | |
383776fa | 648 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 649 | if (can_addr) { |
383776fa | 650 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
651 | *can_addr += (unsigned long) |
652 | per_cpu_ptr(mod->percpu, | |
653 | get_boot_cpu_id()); | |
654 | } | |
10fad5e4 TH |
655 | preempt_enable(); |
656 | return true; | |
657 | } | |
658 | } | |
659 | } | |
660 | ||
661 | preempt_enable(); | |
662 | return false; | |
6b588c18 TH |
663 | } |
664 | ||
383776fa | 665 | /** |
24389b61 | 666 | * is_module_percpu_address() - test whether address is from module static percpu |
383776fa TG |
667 | * @addr: address to test |
668 | * | |
669 | * Test whether @addr belongs to module static percpu area. | |
670 | * | |
24389b61 | 671 | * Return: %true if @addr is from module static percpu area |
383776fa TG |
672 | */ |
673 | bool is_module_percpu_address(unsigned long addr) | |
674 | { | |
675 | return __is_module_percpu_address(addr, NULL); | |
676 | } | |
677 | ||
1da177e4 | 678 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 679 | |
259354de | 680 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
681 | { |
682 | return NULL; | |
683 | } | |
9eb76d77 | 684 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 685 | { |
9eb76d77 RR |
686 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
687 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
688 | return -ENOMEM; | |
689 | return 0; | |
259354de TH |
690 | } |
691 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 692 | { |
1da177e4 | 693 | } |
49668688 | 694 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
695 | { |
696 | return 0; | |
697 | } | |
259354de TH |
698 | static inline void percpu_modcopy(struct module *mod, |
699 | const void *from, unsigned long size) | |
1da177e4 LT |
700 | { |
701 | /* pcpusec should be 0, and size of that section should be 0. */ | |
702 | BUG_ON(size != 0); | |
703 | } | |
10fad5e4 TH |
704 | bool is_module_percpu_address(unsigned long addr) |
705 | { | |
706 | return false; | |
707 | } | |
6b588c18 | 708 | |
383776fa TG |
709 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
710 | { | |
711 | return false; | |
712 | } | |
713 | ||
1da177e4 LT |
714 | #endif /* CONFIG_SMP */ |
715 | ||
c988d2b2 MD |
716 | #define MODINFO_ATTR(field) \ |
717 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
718 | { \ | |
719 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
720 | } \ | |
721 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 722 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 723 | { \ |
cc56ded3 | 724 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
725 | } \ |
726 | static int modinfo_##field##_exists(struct module *mod) \ | |
727 | { \ | |
728 | return mod->field != NULL; \ | |
729 | } \ | |
730 | static void free_modinfo_##field(struct module *mod) \ | |
731 | { \ | |
22a8bdeb DW |
732 | kfree(mod->field); \ |
733 | mod->field = NULL; \ | |
c988d2b2 MD |
734 | } \ |
735 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 736 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
737 | .show = show_modinfo_##field, \ |
738 | .setup = setup_modinfo_##field, \ | |
739 | .test = modinfo_##field##_exists, \ | |
740 | .free = free_modinfo_##field, \ | |
741 | }; | |
742 | ||
743 | MODINFO_ATTR(version); | |
744 | MODINFO_ATTR(srcversion); | |
745 | ||
e14af7ee AV |
746 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
747 | ||
03e88ae1 | 748 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
749 | |
750 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
751 | ||
e513cc1c MH |
752 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
753 | #define MODULE_REF_BASE 1 | |
754 | ||
1da177e4 | 755 | /* Init the unload section of the module. */ |
9f85a4bb | 756 | static int module_unload_init(struct module *mod) |
1da177e4 | 757 | { |
e513cc1c MH |
758 | /* |
759 | * Initialize reference counter to MODULE_REF_BASE. | |
760 | * refcnt == 0 means module is going. | |
761 | */ | |
762 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 763 | |
2c02dfe7 LT |
764 | INIT_LIST_HEAD(&mod->source_list); |
765 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 766 | |
1da177e4 | 767 | /* Hold reference count during initialization. */ |
e513cc1c | 768 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
769 | |
770 | return 0; | |
1da177e4 LT |
771 | } |
772 | ||
1da177e4 LT |
773 | /* Does a already use b? */ |
774 | static int already_uses(struct module *a, struct module *b) | |
775 | { | |
776 | struct module_use *use; | |
777 | ||
2c02dfe7 LT |
778 | list_for_each_entry(use, &b->source_list, source_list) { |
779 | if (use->source == a) { | |
5e124169 | 780 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
781 | return 1; |
782 | } | |
783 | } | |
5e124169 | 784 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
785 | return 0; |
786 | } | |
787 | ||
2c02dfe7 LT |
788 | /* |
789 | * Module a uses b | |
790 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
791 | * - the module_use is added to the list of 'b' sources (so | |
792 | * 'b' can walk the list to see who sourced them), and of 'a' | |
793 | * targets (so 'a' can see what modules it targets). | |
794 | */ | |
795 | static int add_module_usage(struct module *a, struct module *b) | |
796 | { | |
2c02dfe7 LT |
797 | struct module_use *use; |
798 | ||
5e124169 | 799 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 800 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 801 | if (!use) |
2c02dfe7 | 802 | return -ENOMEM; |
2c02dfe7 LT |
803 | |
804 | use->source = a; | |
805 | use->target = b; | |
806 | list_add(&use->source_list, &b->source_list); | |
807 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
808 | return 0; |
809 | } | |
810 | ||
75676500 | 811 | /* Module a uses b: caller needs module_mutex() */ |
7ef5264d | 812 | static int ref_module(struct module *a, struct module *b) |
1da177e4 | 813 | { |
c8e21ced | 814 | int err; |
270a6c4c | 815 | |
9bea7f23 | 816 | if (b == NULL || already_uses(a, b)) |
218ce735 | 817 | return 0; |
218ce735 | 818 | |
9bea7f23 RR |
819 | /* If module isn't available, we fail. */ |
820 | err = strong_try_module_get(b); | |
c9a3ba55 | 821 | if (err) |
9bea7f23 | 822 | return err; |
1da177e4 | 823 | |
2c02dfe7 LT |
824 | err = add_module_usage(a, b); |
825 | if (err) { | |
1da177e4 | 826 | module_put(b); |
9bea7f23 | 827 | return err; |
1da177e4 | 828 | } |
9bea7f23 | 829 | return 0; |
1da177e4 LT |
830 | } |
831 | ||
832 | /* Clear the unload stuff of the module. */ | |
833 | static void module_unload_free(struct module *mod) | |
834 | { | |
2c02dfe7 | 835 | struct module_use *use, *tmp; |
1da177e4 | 836 | |
75676500 | 837 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
838 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
839 | struct module *i = use->target; | |
5e124169 | 840 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
841 | module_put(i); |
842 | list_del(&use->source_list); | |
843 | list_del(&use->target_list); | |
844 | kfree(use); | |
1da177e4 | 845 | } |
75676500 | 846 | mutex_unlock(&module_mutex); |
1da177e4 LT |
847 | } |
848 | ||
849 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 850 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
851 | { |
852 | int ret = (flags & O_TRUNC); | |
853 | if (ret) | |
373d4d09 | 854 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
855 | return ret; |
856 | } | |
857 | #else | |
fb169793 | 858 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
859 | { |
860 | return 0; | |
861 | } | |
862 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
863 | ||
e513cc1c MH |
864 | /* Try to release refcount of module, 0 means success. */ |
865 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 866 | { |
e513cc1c | 867 | int ret; |
1da177e4 | 868 | |
e513cc1c MH |
869 | /* Try to decrement refcnt which we set at loading */ |
870 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
871 | BUG_ON(ret < 0); | |
872 | if (ret) | |
873 | /* Someone can put this right now, recover with checking */ | |
874 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 875 | |
e513cc1c MH |
876 | return ret; |
877 | } | |
1da177e4 | 878 | |
e513cc1c MH |
879 | static int try_stop_module(struct module *mod, int flags, int *forced) |
880 | { | |
da39ba5e | 881 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
882 | if (try_release_module_ref(mod) != 0) { |
883 | *forced = try_force_unload(flags); | |
884 | if (!(*forced)) | |
1da177e4 LT |
885 | return -EWOULDBLOCK; |
886 | } | |
887 | ||
888 | /* Mark it as dying. */ | |
e513cc1c | 889 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 890 | |
e513cc1c | 891 | return 0; |
1da177e4 LT |
892 | } |
893 | ||
d5db139a | 894 | /** |
24389b61 | 895 | * module_refcount() - return the refcount or -1 if unloading |
d5db139a RR |
896 | * @mod: the module we're checking |
897 | * | |
24389b61 | 898 | * Return: |
d5db139a RR |
899 | * -1 if the module is in the process of unloading |
900 | * otherwise the number of references in the kernel to the module | |
901 | */ | |
902 | int module_refcount(struct module *mod) | |
1da177e4 | 903 | { |
d5db139a | 904 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
905 | } |
906 | EXPORT_SYMBOL(module_refcount); | |
907 | ||
908 | /* This exists whether we can unload or not */ | |
909 | static void free_module(struct module *mod); | |
910 | ||
17da2bd9 HC |
911 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
912 | unsigned int, flags) | |
1da177e4 LT |
913 | { |
914 | struct module *mod; | |
dfff0a06 | 915 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
916 | int ret, forced = 0; |
917 | ||
3d43321b | 918 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
919 | return -EPERM; |
920 | ||
921 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
922 | return -EFAULT; | |
923 | name[MODULE_NAME_LEN-1] = '\0'; | |
924 | ||
f6276ac9 RGB |
925 | audit_log_kern_module(name); |
926 | ||
3fc1f1e2 TH |
927 | if (mutex_lock_interruptible(&module_mutex) != 0) |
928 | return -EINTR; | |
1da177e4 LT |
929 | |
930 | mod = find_module(name); | |
931 | if (!mod) { | |
932 | ret = -ENOENT; | |
933 | goto out; | |
934 | } | |
935 | ||
2c02dfe7 | 936 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
937 | /* Other modules depend on us: get rid of them first. */ |
938 | ret = -EWOULDBLOCK; | |
939 | goto out; | |
940 | } | |
941 | ||
942 | /* Doing init or already dying? */ | |
943 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 944 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 945 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
946 | ret = -EBUSY; |
947 | goto out; | |
948 | } | |
949 | ||
950 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 951 | if (mod->init && !mod->exit) { |
fb169793 | 952 | forced = try_force_unload(flags); |
1da177e4 LT |
953 | if (!forced) { |
954 | /* This module can't be removed */ | |
955 | ret = -EBUSY; | |
956 | goto out; | |
957 | } | |
958 | } | |
959 | ||
1da177e4 LT |
960 | /* Stop the machine so refcounts can't move and disable module. */ |
961 | ret = try_stop_module(mod, flags, &forced); | |
962 | if (ret != 0) | |
963 | goto out; | |
964 | ||
df4b565e | 965 | mutex_unlock(&module_mutex); |
25985edc | 966 | /* Final destruction now no one is using it. */ |
df4b565e | 967 | if (mod->exit != NULL) |
1da177e4 | 968 | mod->exit(); |
df4b565e PO |
969 | blocking_notifier_call_chain(&module_notify_list, |
970 | MODULE_STATE_GOING, mod); | |
7e545d6e | 971 | klp_module_going(mod); |
7dcd182b JY |
972 | ftrace_release_mod(mod); |
973 | ||
22a9d645 | 974 | async_synchronize_full(); |
75676500 | 975 | |
e14af7ee | 976 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 977 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 978 | |
75676500 | 979 | free_module(mod); |
5d603311 KK |
980 | /* someone could wait for the module in add_unformed_module() */ |
981 | wake_up_all(&module_wq); | |
75676500 RR |
982 | return 0; |
983 | out: | |
6389a385 | 984 | mutex_unlock(&module_mutex); |
1da177e4 LT |
985 | return ret; |
986 | } | |
987 | ||
d1e99d7a | 988 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
989 | { |
990 | struct module_use *use; | |
991 | int printed_something = 0; | |
992 | ||
d5db139a | 993 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 994 | |
6da0b565 IA |
995 | /* |
996 | * Always include a trailing , so userspace can differentiate | |
997 | * between this and the old multi-field proc format. | |
998 | */ | |
2c02dfe7 | 999 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1000 | printed_something = 1; |
2c02dfe7 | 1001 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1002 | } |
1003 | ||
1da177e4 LT |
1004 | if (mod->init != NULL && mod->exit == NULL) { |
1005 | printed_something = 1; | |
6da0b565 | 1006 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | if (!printed_something) | |
6da0b565 | 1010 | seq_puts(m, "-"); |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | void __symbol_put(const char *symbol) | |
1014 | { | |
0b96615c CH |
1015 | struct find_symbol_arg fsa = { |
1016 | .name = symbol, | |
1017 | .gplok = true, | |
1018 | }; | |
1da177e4 | 1019 | |
24da1cbf | 1020 | preempt_disable(); |
0b96615c | 1021 | if (!find_symbol(&fsa)) |
1da177e4 | 1022 | BUG(); |
0b96615c | 1023 | module_put(fsa.owner); |
24da1cbf | 1024 | preempt_enable(); |
1da177e4 LT |
1025 | } |
1026 | EXPORT_SYMBOL(__symbol_put); | |
1027 | ||
7d1d16e4 | 1028 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1029 | void symbol_put_addr(void *addr) |
1030 | { | |
5e376613 | 1031 | struct module *modaddr; |
7d1d16e4 | 1032 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1033 | |
7d1d16e4 | 1034 | if (core_kernel_text(a)) |
5e376613 | 1035 | return; |
1da177e4 | 1036 | |
275d7d44 PZ |
1037 | /* |
1038 | * Even though we hold a reference on the module; we still need to | |
1039 | * disable preemption in order to safely traverse the data structure. | |
1040 | */ | |
1041 | preempt_disable(); | |
7d1d16e4 | 1042 | modaddr = __module_text_address(a); |
a6e6abd5 | 1043 | BUG_ON(!modaddr); |
5e376613 | 1044 | module_put(modaddr); |
275d7d44 | 1045 | preempt_enable(); |
1da177e4 LT |
1046 | } |
1047 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1048 | ||
1049 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1050 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1051 | { |
d5db139a | 1052 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1053 | } |
1054 | ||
cca3e707 KS |
1055 | static struct module_attribute modinfo_refcnt = |
1056 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1057 | |
d53799be SR |
1058 | void __module_get(struct module *module) |
1059 | { | |
1060 | if (module) { | |
1061 | preempt_disable(); | |
2f35c41f | 1062 | atomic_inc(&module->refcnt); |
d53799be SR |
1063 | trace_module_get(module, _RET_IP_); |
1064 | preempt_enable(); | |
1065 | } | |
1066 | } | |
1067 | EXPORT_SYMBOL(__module_get); | |
1068 | ||
1069 | bool try_module_get(struct module *module) | |
1070 | { | |
1071 | bool ret = true; | |
1072 | ||
1073 | if (module) { | |
1074 | preempt_disable(); | |
e513cc1c MH |
1075 | /* Note: here, we can fail to get a reference */ |
1076 | if (likely(module_is_live(module) && | |
1077 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1078 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1079 | else |
d53799be SR |
1080 | ret = false; |
1081 | ||
1082 | preempt_enable(); | |
1083 | } | |
1084 | return ret; | |
1085 | } | |
1086 | EXPORT_SYMBOL(try_module_get); | |
1087 | ||
f6a57033 AV |
1088 | void module_put(struct module *module) |
1089 | { | |
e513cc1c MH |
1090 | int ret; |
1091 | ||
f6a57033 | 1092 | if (module) { |
e1783a24 | 1093 | preempt_disable(); |
e513cc1c MH |
1094 | ret = atomic_dec_if_positive(&module->refcnt); |
1095 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1096 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1097 | preempt_enable(); |
f6a57033 AV |
1098 | } |
1099 | } | |
1100 | EXPORT_SYMBOL(module_put); | |
1101 | ||
1da177e4 | 1102 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1103 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1104 | { |
1105 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1106 | seq_puts(m, " - -"); |
1da177e4 LT |
1107 | } |
1108 | ||
1109 | static inline void module_unload_free(struct module *mod) | |
1110 | { | |
1111 | } | |
1112 | ||
7ef5264d | 1113 | static int ref_module(struct module *a, struct module *b) |
1da177e4 | 1114 | { |
9bea7f23 | 1115 | return strong_try_module_get(b); |
1da177e4 LT |
1116 | } |
1117 | ||
9f85a4bb | 1118 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1119 | { |
9f85a4bb | 1120 | return 0; |
1da177e4 LT |
1121 | } |
1122 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1123 | ||
53999bf3 KW |
1124 | static size_t module_flags_taint(struct module *mod, char *buf) |
1125 | { | |
1126 | size_t l = 0; | |
7fd8329b PM |
1127 | int i; |
1128 | ||
1129 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1130 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1131 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1132 | } |
53999bf3 | 1133 | |
53999bf3 KW |
1134 | return l; |
1135 | } | |
1136 | ||
1f71740a | 1137 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1138 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1139 | { |
1140 | const char *state = "unknown"; | |
1141 | ||
4befb026 | 1142 | switch (mk->mod->state) { |
1f71740a KS |
1143 | case MODULE_STATE_LIVE: |
1144 | state = "live"; | |
1145 | break; | |
1146 | case MODULE_STATE_COMING: | |
1147 | state = "coming"; | |
1148 | break; | |
1149 | case MODULE_STATE_GOING: | |
1150 | state = "going"; | |
1151 | break; | |
0d21b0e3 RR |
1152 | default: |
1153 | BUG(); | |
1f71740a KS |
1154 | } |
1155 | return sprintf(buffer, "%s\n", state); | |
1156 | } | |
1157 | ||
cca3e707 KS |
1158 | static struct module_attribute modinfo_initstate = |
1159 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1160 | |
88bfa324 KS |
1161 | static ssize_t store_uevent(struct module_attribute *mattr, |
1162 | struct module_kobject *mk, | |
1163 | const char *buffer, size_t count) | |
1164 | { | |
df44b479 PR |
1165 | int rc; |
1166 | ||
1167 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
1168 | return rc ? rc : count; | |
88bfa324 KS |
1169 | } |
1170 | ||
cca3e707 KS |
1171 | struct module_attribute module_uevent = |
1172 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1173 | ||
1174 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1175 | struct module_kobject *mk, char *buffer) | |
1176 | { | |
7523e4dc | 1177 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1178 | } |
1179 | ||
1180 | static struct module_attribute modinfo_coresize = | |
1181 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1182 | ||
1183 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1184 | struct module_kobject *mk, char *buffer) | |
1185 | { | |
7523e4dc | 1186 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1187 | } |
1188 | ||
1189 | static struct module_attribute modinfo_initsize = | |
1190 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1191 | ||
1192 | static ssize_t show_taint(struct module_attribute *mattr, | |
1193 | struct module_kobject *mk, char *buffer) | |
1194 | { | |
1195 | size_t l; | |
1196 | ||
1197 | l = module_flags_taint(mk->mod, buffer); | |
1198 | buffer[l++] = '\n'; | |
1199 | return l; | |
1200 | } | |
1201 | ||
1202 | static struct module_attribute modinfo_taint = | |
1203 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1204 | |
03e88ae1 | 1205 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1206 | &module_uevent, |
03e88ae1 GKH |
1207 | &modinfo_version, |
1208 | &modinfo_srcversion, | |
cca3e707 KS |
1209 | &modinfo_initstate, |
1210 | &modinfo_coresize, | |
1211 | &modinfo_initsize, | |
1212 | &modinfo_taint, | |
03e88ae1 | 1213 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1214 | &modinfo_refcnt, |
03e88ae1 GKH |
1215 | #endif |
1216 | NULL, | |
1217 | }; | |
1218 | ||
1da177e4 LT |
1219 | static const char vermagic[] = VERMAGIC_STRING; |
1220 | ||
c6e665c8 | 1221 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1222 | { |
1223 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1224 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1225 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1226 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1227 | return 0; |
1228 | #else | |
1229 | return -ENOEXEC; | |
1230 | #endif | |
1231 | } | |
1232 | ||
1da177e4 | 1233 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1234 | |
1235 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1236 | { |
71810db2 | 1237 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1238 | } |
1239 | ||
49019426 | 1240 | static int check_version(const struct load_info *info, |
1da177e4 | 1241 | const char *symname, |
6da0b565 | 1242 | struct module *mod, |
71810db2 | 1243 | const s32 *crc) |
1da177e4 | 1244 | { |
49019426 KC |
1245 | Elf_Shdr *sechdrs = info->sechdrs; |
1246 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1247 | unsigned int i, num_versions; |
1248 | struct modversion_info *versions; | |
1249 | ||
1250 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1251 | if (!crc) | |
1252 | return 1; | |
1253 | ||
a5dd6970 RR |
1254 | /* No versions at all? modprobe --force does this. */ |
1255 | if (versindex == 0) | |
1256 | return try_to_force_load(mod, symname) == 0; | |
1257 | ||
1da177e4 LT |
1258 | versions = (void *) sechdrs[versindex].sh_addr; |
1259 | num_versions = sechdrs[versindex].sh_size | |
1260 | / sizeof(struct modversion_info); | |
1261 | ||
1262 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1263 | u32 crcval; |
1264 | ||
1da177e4 LT |
1265 | if (strcmp(versions[i].name, symname) != 0) |
1266 | continue; | |
1267 | ||
71810db2 AB |
1268 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1269 | crcval = resolve_rel_crc(crc); | |
1270 | else | |
1271 | crcval = *crc; | |
1272 | if (versions[i].crc == crcval) | |
1da177e4 | 1273 | return 1; |
71810db2 AB |
1274 | pr_debug("Found checksum %X vs module %lX\n", |
1275 | crcval, versions[i].crc); | |
826e4506 | 1276 | goto bad_version; |
1da177e4 | 1277 | } |
826e4506 | 1278 | |
faaae2a5 | 1279 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1280 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1281 | return 1; |
826e4506 LT |
1282 | |
1283 | bad_version: | |
6da0b565 | 1284 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1285 | info->name, symname); |
826e4506 | 1286 | return 0; |
1da177e4 LT |
1287 | } |
1288 | ||
49019426 | 1289 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1290 | struct module *mod) |
1291 | { | |
0b96615c CH |
1292 | struct find_symbol_arg fsa = { |
1293 | .name = "module_layout", | |
1294 | .gplok = true, | |
1295 | }; | |
1da177e4 | 1296 | |
926a59b1 PZ |
1297 | /* |
1298 | * Since this should be found in kernel (which can't be removed), no | |
1299 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1300 | */ | |
1301 | preempt_disable(); | |
0b96615c | 1302 | if (!find_symbol(&fsa)) { |
926a59b1 | 1303 | preempt_enable(); |
1da177e4 | 1304 | BUG(); |
926a59b1 PZ |
1305 | } |
1306 | preempt_enable(); | |
0b96615c | 1307 | return check_version(info, "module_layout", mod, fsa.crc); |
1da177e4 LT |
1308 | } |
1309 | ||
91e37a79 RR |
1310 | /* First part is kernel version, which we ignore if module has crcs. */ |
1311 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1312 | bool has_crcs) | |
1da177e4 | 1313 | { |
91e37a79 RR |
1314 | if (has_crcs) { |
1315 | amagic += strcspn(amagic, " "); | |
1316 | bmagic += strcspn(bmagic, " "); | |
1317 | } | |
1da177e4 LT |
1318 | return strcmp(amagic, bmagic) == 0; |
1319 | } | |
1320 | #else | |
49019426 | 1321 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1322 | const char *symname, |
6da0b565 | 1323 | struct module *mod, |
71810db2 | 1324 | const s32 *crc) |
1da177e4 LT |
1325 | { |
1326 | return 1; | |
1327 | } | |
1328 | ||
49019426 | 1329 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1330 | struct module *mod) |
1331 | { | |
1332 | return 1; | |
1333 | } | |
1334 | ||
91e37a79 RR |
1335 | static inline int same_magic(const char *amagic, const char *bmagic, |
1336 | bool has_crcs) | |
1da177e4 LT |
1337 | { |
1338 | return strcmp(amagic, bmagic) == 0; | |
1339 | } | |
1340 | #endif /* CONFIG_MODVERSIONS */ | |
1341 | ||
8651ec01 MM |
1342 | static char *get_modinfo(const struct load_info *info, const char *tag); |
1343 | static char *get_next_modinfo(const struct load_info *info, const char *tag, | |
1344 | char *prev); | |
1345 | ||
1346 | static int verify_namespace_is_imported(const struct load_info *info, | |
1347 | const struct kernel_symbol *sym, | |
1348 | struct module *mod) | |
1349 | { | |
1350 | const char *namespace; | |
1351 | char *imported_namespace; | |
1352 | ||
1353 | namespace = kernel_symbol_namespace(sym); | |
c3a6cf19 | 1354 | if (namespace && namespace[0]) { |
8651ec01 MM |
1355 | imported_namespace = get_modinfo(info, "import_ns"); |
1356 | while (imported_namespace) { | |
1357 | if (strcmp(namespace, imported_namespace) == 0) | |
1358 | return 0; | |
1359 | imported_namespace = get_next_modinfo( | |
1360 | info, "import_ns", imported_namespace); | |
1361 | } | |
3d52ec5e MM |
1362 | #ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
1363 | pr_warn( | |
1364 | #else | |
1365 | pr_err( | |
1366 | #endif | |
1367 | "%s: module uses symbol (%s) from namespace %s, but does not import it.\n", | |
1368 | mod->name, kernel_symbol_name(sym), namespace); | |
1369 | #ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS | |
8651ec01 | 1370 | return -EINVAL; |
3d52ec5e | 1371 | #endif |
8651ec01 MM |
1372 | } |
1373 | return 0; | |
1374 | } | |
1375 | ||
262e6ae7 CH |
1376 | static bool inherit_taint(struct module *mod, struct module *owner) |
1377 | { | |
1378 | if (!owner || !test_bit(TAINT_PROPRIETARY_MODULE, &owner->taints)) | |
1379 | return true; | |
1380 | ||
1381 | if (mod->using_gplonly_symbols) { | |
1382 | pr_err("%s: module using GPL-only symbols uses symbols from proprietary module %s.\n", | |
1383 | mod->name, owner->name); | |
1384 | return false; | |
1385 | } | |
1386 | ||
1387 | if (!test_bit(TAINT_PROPRIETARY_MODULE, &mod->taints)) { | |
1388 | pr_warn("%s: module uses symbols from proprietary module %s, inheriting taint.\n", | |
1389 | mod->name, owner->name); | |
1390 | set_bit(TAINT_PROPRIETARY_MODULE, &mod->taints); | |
1391 | } | |
1392 | return true; | |
1393 | } | |
8651ec01 | 1394 | |
75676500 | 1395 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1396 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1397 | const struct load_info *info, | |
414fd31b | 1398 | const char *name, |
9bea7f23 | 1399 | char ownername[]) |
1da177e4 | 1400 | { |
0b96615c CH |
1401 | struct find_symbol_arg fsa = { |
1402 | .name = name, | |
1403 | .gplok = !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), | |
1404 | .warn = true, | |
1405 | }; | |
9bea7f23 | 1406 | int err; |
1da177e4 | 1407 | |
d64810f5 PZ |
1408 | /* |
1409 | * The module_mutex should not be a heavily contended lock; | |
1410 | * if we get the occasional sleep here, we'll go an extra iteration | |
1411 | * in the wait_event_interruptible(), which is harmless. | |
1412 | */ | |
1413 | sched_annotate_sleep(); | |
75676500 | 1414 | mutex_lock(&module_mutex); |
0b96615c | 1415 | if (!find_symbol(&fsa)) |
9bea7f23 RR |
1416 | goto unlock; |
1417 | ||
0b96615c | 1418 | if (fsa.license == GPL_ONLY) |
262e6ae7 CH |
1419 | mod->using_gplonly_symbols = true; |
1420 | ||
0b96615c CH |
1421 | if (!inherit_taint(mod, fsa.owner)) { |
1422 | fsa.sym = NULL; | |
262e6ae7 CH |
1423 | goto getname; |
1424 | } | |
1425 | ||
0b96615c CH |
1426 | if (!check_version(info, name, mod, fsa.crc)) { |
1427 | fsa.sym = ERR_PTR(-EINVAL); | |
9bea7f23 | 1428 | goto getname; |
1da177e4 | 1429 | } |
9bea7f23 | 1430 | |
0b96615c | 1431 | err = verify_namespace_is_imported(info, fsa.sym, mod); |
8651ec01 | 1432 | if (err) { |
0b96615c | 1433 | fsa.sym = ERR_PTR(err); |
8651ec01 MM |
1434 | goto getname; |
1435 | } | |
1436 | ||
0b96615c | 1437 | err = ref_module(mod, fsa.owner); |
9bea7f23 | 1438 | if (err) { |
0b96615c | 1439 | fsa.sym = ERR_PTR(err); |
9bea7f23 RR |
1440 | goto getname; |
1441 | } | |
1442 | ||
1443 | getname: | |
1444 | /* We must make copy under the lock if we failed to get ref. */ | |
0b96615c | 1445 | strncpy(ownername, module_name(fsa.owner), MODULE_NAME_LEN); |
9bea7f23 | 1446 | unlock: |
75676500 | 1447 | mutex_unlock(&module_mutex); |
0b96615c | 1448 | return fsa.sym; |
1da177e4 LT |
1449 | } |
1450 | ||
49668688 RR |
1451 | static const struct kernel_symbol * |
1452 | resolve_symbol_wait(struct module *mod, | |
1453 | const struct load_info *info, | |
1454 | const char *name) | |
9bea7f23 RR |
1455 | { |
1456 | const struct kernel_symbol *ksym; | |
49668688 | 1457 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1458 | |
1459 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1460 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1461 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1462 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1463 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1464 | mod->name, owner); | |
9bea7f23 RR |
1465 | } |
1466 | return ksym; | |
1467 | } | |
1468 | ||
1da177e4 LT |
1469 | /* |
1470 | * /sys/module/foo/sections stuff | |
1471 | * J. Corbet <corbet@lwn.net> | |
1472 | */ | |
8f6d0378 | 1473 | #ifdef CONFIG_SYSFS |
10b465aa | 1474 | |
8f6d0378 | 1475 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1476 | static inline bool sect_empty(const Elf_Shdr *sect) |
1477 | { | |
1478 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1479 | } | |
1480 | ||
6da0b565 | 1481 | struct module_sect_attr { |
ed66f991 | 1482 | struct bin_attribute battr; |
a58730c4 RR |
1483 | unsigned long address; |
1484 | }; | |
1485 | ||
6da0b565 | 1486 | struct module_sect_attrs { |
a58730c4 RR |
1487 | struct attribute_group grp; |
1488 | unsigned int nsections; | |
0f742266 | 1489 | struct module_sect_attr attrs[]; |
a58730c4 RR |
1490 | }; |
1491 | ||
11990a5b | 1492 | #define MODULE_SECT_READ_SIZE (3 /* "0x", "\n" */ + (BITS_PER_LONG / 4)) |
ed66f991 KC |
1493 | static ssize_t module_sect_read(struct file *file, struct kobject *kobj, |
1494 | struct bin_attribute *battr, | |
1495 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1496 | { |
1497 | struct module_sect_attr *sattr = | |
ed66f991 | 1498 | container_of(battr, struct module_sect_attr, battr); |
11990a5b KC |
1499 | char bounce[MODULE_SECT_READ_SIZE + 1]; |
1500 | size_t wrote; | |
ed66f991 KC |
1501 | |
1502 | if (pos != 0) | |
1503 | return -EINVAL; | |
1504 | ||
11990a5b KC |
1505 | /* |
1506 | * Since we're a binary read handler, we must account for the | |
1507 | * trailing NUL byte that sprintf will write: if "buf" is | |
1508 | * too small to hold the NUL, or the NUL is exactly the last | |
1509 | * byte, the read will look like it got truncated by one byte. | |
1510 | * Since there is no way to ask sprintf nicely to not write | |
1511 | * the NUL, we have to use a bounce buffer. | |
1512 | */ | |
1513 | wrote = scnprintf(bounce, sizeof(bounce), "0x%px\n", | |
1514 | kallsyms_show_value(file->f_cred) | |
1515 | ? (void *)sattr->address : NULL); | |
1516 | count = min(count, wrote); | |
1517 | memcpy(buf, bounce, count); | |
1518 | ||
1519 | return count; | |
1da177e4 LT |
1520 | } |
1521 | ||
04b1db9f IN |
1522 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1523 | { | |
a58730c4 | 1524 | unsigned int section; |
04b1db9f IN |
1525 | |
1526 | for (section = 0; section < sect_attrs->nsections; section++) | |
ed66f991 | 1527 | kfree(sect_attrs->attrs[section].battr.attr.name); |
04b1db9f IN |
1528 | kfree(sect_attrs); |
1529 | } | |
1530 | ||
8f6d0378 | 1531 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1532 | { |
1533 | unsigned int nloaded = 0, i, size[2]; | |
1534 | struct module_sect_attrs *sect_attrs; | |
1535 | struct module_sect_attr *sattr; | |
ed66f991 | 1536 | struct bin_attribute **gattr; |
22a8bdeb | 1537 | |
1da177e4 | 1538 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1539 | for (i = 0; i < info->hdr->e_shnum; i++) |
1540 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 | 1541 | nloaded++; |
8d1b73dd | 1542 | size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
ed66f991 KC |
1543 | sizeof(sect_attrs->grp.bin_attrs[0])); |
1544 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.bin_attrs[0]); | |
04b1db9f IN |
1545 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1546 | if (sect_attrs == NULL) | |
1da177e4 LT |
1547 | return; |
1548 | ||
1549 | /* Setup section attributes. */ | |
1550 | sect_attrs->grp.name = "sections"; | |
ed66f991 | 1551 | sect_attrs->grp.bin_attrs = (void *)sect_attrs + size[0]; |
1da177e4 | 1552 | |
04b1db9f | 1553 | sect_attrs->nsections = 0; |
1da177e4 | 1554 | sattr = §_attrs->attrs[0]; |
ed66f991 | 1555 | gattr = §_attrs->grp.bin_attrs[0]; |
8f6d0378 RR |
1556 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1557 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1558 | if (sect_empty(sec)) | |
35dead42 | 1559 | continue; |
ed66f991 | 1560 | sysfs_bin_attr_init(&sattr->battr); |
8f6d0378 | 1561 | sattr->address = sec->sh_addr; |
ed66f991 KC |
1562 | sattr->battr.attr.name = |
1563 | kstrdup(info->secstrings + sec->sh_name, GFP_KERNEL); | |
1564 | if (sattr->battr.attr.name == NULL) | |
04b1db9f IN |
1565 | goto out; |
1566 | sect_attrs->nsections++; | |
ed66f991 | 1567 | sattr->battr.read = module_sect_read; |
11990a5b | 1568 | sattr->battr.size = MODULE_SECT_READ_SIZE; |
ed66f991 KC |
1569 | sattr->battr.attr.mode = 0400; |
1570 | *(gattr++) = &(sattr++)->battr; | |
1da177e4 LT |
1571 | } |
1572 | *gattr = NULL; | |
1573 | ||
1574 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1575 | goto out; | |
1576 | ||
1577 | mod->sect_attrs = sect_attrs; | |
1578 | return; | |
1579 | out: | |
04b1db9f | 1580 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1581 | } |
1582 | ||
1583 | static void remove_sect_attrs(struct module *mod) | |
1584 | { | |
1585 | if (mod->sect_attrs) { | |
1586 | sysfs_remove_group(&mod->mkobj.kobj, | |
1587 | &mod->sect_attrs->grp); | |
24b9f0d2 SS |
1588 | /* |
1589 | * We are positive that no one is using any sect attrs | |
1590 | * at this point. Deallocate immediately. | |
1591 | */ | |
04b1db9f | 1592 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1593 | mod->sect_attrs = NULL; |
1594 | } | |
1595 | } | |
1596 | ||
6d760133 RM |
1597 | /* |
1598 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1599 | */ | |
1600 | ||
1601 | struct module_notes_attrs { | |
1602 | struct kobject *dir; | |
1603 | unsigned int notes; | |
0f742266 | 1604 | struct bin_attribute attrs[]; |
6d760133 RM |
1605 | }; |
1606 | ||
2c3c8bea | 1607 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1608 | struct bin_attribute *bin_attr, |
1609 | char *buf, loff_t pos, size_t count) | |
1610 | { | |
1611 | /* | |
1612 | * The caller checked the pos and count against our size. | |
1613 | */ | |
1614 | memcpy(buf, bin_attr->private + pos, count); | |
1615 | return count; | |
1616 | } | |
1617 | ||
1618 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1619 | unsigned int i) | |
1620 | { | |
1621 | if (notes_attrs->dir) { | |
1622 | while (i-- > 0) | |
1623 | sysfs_remove_bin_file(notes_attrs->dir, | |
1624 | ¬es_attrs->attrs[i]); | |
e9432093 | 1625 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1626 | } |
1627 | kfree(notes_attrs); | |
1628 | } | |
1629 | ||
8f6d0378 | 1630 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1631 | { |
1632 | unsigned int notes, loaded, i; | |
1633 | struct module_notes_attrs *notes_attrs; | |
1634 | struct bin_attribute *nattr; | |
1635 | ||
ea6bff36 IM |
1636 | /* failed to create section attributes, so can't create notes */ |
1637 | if (!mod->sect_attrs) | |
1638 | return; | |
1639 | ||
6d760133 RM |
1640 | /* Count notes sections and allocate structures. */ |
1641 | notes = 0; | |
8f6d0378 RR |
1642 | for (i = 0; i < info->hdr->e_shnum; i++) |
1643 | if (!sect_empty(&info->sechdrs[i]) && | |
1644 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1645 | ++notes; |
1646 | ||
1647 | if (notes == 0) | |
1648 | return; | |
1649 | ||
acafe7e3 | 1650 | notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
6d760133 RM |
1651 | GFP_KERNEL); |
1652 | if (notes_attrs == NULL) | |
1653 | return; | |
1654 | ||
1655 | notes_attrs->notes = notes; | |
1656 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1657 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1658 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1659 | continue; |
8f6d0378 | 1660 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1661 | sysfs_bin_attr_init(nattr); |
ed66f991 | 1662 | nattr->attr.name = mod->sect_attrs->attrs[loaded].battr.attr.name; |
6d760133 | 1663 | nattr->attr.mode = S_IRUGO; |
8f6d0378 RR |
1664 | nattr->size = info->sechdrs[i].sh_size; |
1665 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1666 | nattr->read = module_notes_read; |
1667 | ++nattr; | |
1668 | } | |
1669 | ++loaded; | |
1670 | } | |
1671 | ||
4ff6abff | 1672 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1673 | if (!notes_attrs->dir) |
1674 | goto out; | |
1675 | ||
1676 | for (i = 0; i < notes; ++i) | |
1677 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1678 | ¬es_attrs->attrs[i])) | |
1679 | goto out; | |
1680 | ||
1681 | mod->notes_attrs = notes_attrs; | |
1682 | return; | |
1683 | ||
1684 | out: | |
1685 | free_notes_attrs(notes_attrs, i); | |
1686 | } | |
1687 | ||
1688 | static void remove_notes_attrs(struct module *mod) | |
1689 | { | |
1690 | if (mod->notes_attrs) | |
1691 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1692 | } | |
1693 | ||
1da177e4 | 1694 | #else |
04b1db9f | 1695 | |
8f6d0378 RR |
1696 | static inline void add_sect_attrs(struct module *mod, |
1697 | const struct load_info *info) | |
1da177e4 LT |
1698 | { |
1699 | } | |
1700 | ||
1701 | static inline void remove_sect_attrs(struct module *mod) | |
1702 | { | |
1703 | } | |
6d760133 | 1704 | |
8f6d0378 RR |
1705 | static inline void add_notes_attrs(struct module *mod, |
1706 | const struct load_info *info) | |
6d760133 RM |
1707 | { |
1708 | } | |
1709 | ||
1710 | static inline void remove_notes_attrs(struct module *mod) | |
1711 | { | |
1712 | } | |
8f6d0378 | 1713 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1714 | |
1ba5c08b | 1715 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1716 | { |
1717 | #ifdef CONFIG_MODULE_UNLOAD | |
1718 | struct module_use *use; | |
80a3d1bb | 1719 | |
75676500 | 1720 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1721 | list_for_each_entry(use, &mod->target_list, target_list) |
1722 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1723 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1724 | #endif |
1725 | } | |
1726 | ||
1ba5c08b | 1727 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1728 | { |
1ba5c08b | 1729 | int ret = 0; |
80a3d1bb RR |
1730 | #ifdef CONFIG_MODULE_UNLOAD |
1731 | struct module_use *use; | |
1732 | ||
75676500 | 1733 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1734 | list_for_each_entry(use, &mod->target_list, target_list) { |
1735 | ret = sysfs_create_link(use->target->holders_dir, | |
1736 | &mod->mkobj.kobj, mod->name); | |
1737 | if (ret) | |
1738 | break; | |
1739 | } | |
75676500 | 1740 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1741 | if (ret) |
1742 | del_usage_links(mod); | |
80a3d1bb | 1743 | #endif |
1ba5c08b | 1744 | return ret; |
80a3d1bb RR |
1745 | } |
1746 | ||
bc6f2a75 Y |
1747 | static void module_remove_modinfo_attrs(struct module *mod, int end); |
1748 | ||
6407ebb2 | 1749 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1750 | { |
1751 | struct module_attribute *attr; | |
03e88ae1 | 1752 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1753 | int error = 0; |
1754 | int i; | |
1755 | ||
03e88ae1 GKH |
1756 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1757 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1758 | GFP_KERNEL); | |
1759 | if (!mod->modinfo_attrs) | |
1760 | return -ENOMEM; | |
1761 | ||
1762 | temp_attr = mod->modinfo_attrs; | |
bc6f2a75 | 1763 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
c75b590d | 1764 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1765 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1766 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1767 | error = sysfs_create_file(&mod->mkobj.kobj, |
1768 | &temp_attr->attr); | |
bc6f2a75 Y |
1769 | if (error) |
1770 | goto error_out; | |
03e88ae1 GKH |
1771 | ++temp_attr; |
1772 | } | |
c988d2b2 | 1773 | } |
bc6f2a75 Y |
1774 | |
1775 | return 0; | |
1776 | ||
1777 | error_out: | |
1778 | if (i > 0) | |
1779 | module_remove_modinfo_attrs(mod, --i); | |
f6d061d6 Y |
1780 | else |
1781 | kfree(mod->modinfo_attrs); | |
c988d2b2 MD |
1782 | return error; |
1783 | } | |
1784 | ||
bc6f2a75 | 1785 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
c988d2b2 MD |
1786 | { |
1787 | struct module_attribute *attr; | |
1788 | int i; | |
1789 | ||
03e88ae1 | 1790 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
bc6f2a75 Y |
1791 | if (end >= 0 && i > end) |
1792 | break; | |
03e88ae1 GKH |
1793 | /* pick a field to test for end of list */ |
1794 | if (!attr->attr.name) | |
1795 | break; | |
6da0b565 | 1796 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1797 | if (attr->free) |
1798 | attr->free(mod); | |
c988d2b2 | 1799 | } |
03e88ae1 | 1800 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1801 | } |
1da177e4 | 1802 | |
942e4431 LZ |
1803 | static void mod_kobject_put(struct module *mod) |
1804 | { | |
1805 | DECLARE_COMPLETION_ONSTACK(c); | |
1806 | mod->mkobj.kobj_completion = &c; | |
1807 | kobject_put(&mod->mkobj.kobj); | |
1808 | wait_for_completion(&c); | |
1809 | } | |
1810 | ||
6407ebb2 | 1811 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1812 | { |
1813 | int err; | |
6494a93d | 1814 | struct kobject *kobj; |
1da177e4 | 1815 | |
823bccfc | 1816 | if (!module_sysfs_initialized) { |
bddb12b3 | 1817 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1818 | err = -EINVAL; |
1819 | goto out; | |
1820 | } | |
6494a93d GKH |
1821 | |
1822 | kobj = kset_find_obj(module_kset, mod->name); | |
1823 | if (kobj) { | |
bddb12b3 | 1824 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1825 | kobject_put(kobj); |
1826 | err = -EINVAL; | |
1827 | goto out; | |
1828 | } | |
1829 | ||
1da177e4 | 1830 | mod->mkobj.mod = mod; |
e17e0f51 | 1831 | |
ac3c8141 GKH |
1832 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1833 | mod->mkobj.kobj.kset = module_kset; | |
1834 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1835 | "%s", mod->name); | |
1836 | if (err) | |
942e4431 | 1837 | mod_kobject_put(mod); |
270a6c4c KS |
1838 | |
1839 | out: | |
1840 | return err; | |
1841 | } | |
1842 | ||
6407ebb2 | 1843 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1844 | const struct load_info *info, |
270a6c4c KS |
1845 | struct kernel_param *kparam, |
1846 | unsigned int num_params) | |
1847 | { | |
1848 | int err; | |
1849 | ||
80a3d1bb RR |
1850 | err = mod_sysfs_init(mod); |
1851 | if (err) | |
1852 | goto out; | |
1853 | ||
4ff6abff | 1854 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1855 | if (!mod->holders_dir) { |
1856 | err = -ENOMEM; | |
270a6c4c | 1857 | goto out_unreg; |
240936e1 | 1858 | } |
270a6c4c | 1859 | |
1da177e4 LT |
1860 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1861 | if (err) | |
270a6c4c | 1862 | goto out_unreg_holders; |
1da177e4 | 1863 | |
c988d2b2 MD |
1864 | err = module_add_modinfo_attrs(mod); |
1865 | if (err) | |
e17e0f51 | 1866 | goto out_unreg_param; |
c988d2b2 | 1867 | |
1ba5c08b CL |
1868 | err = add_usage_links(mod); |
1869 | if (err) | |
1870 | goto out_unreg_modinfo_attrs; | |
1871 | ||
8f6d0378 RR |
1872 | add_sect_attrs(mod, info); |
1873 | add_notes_attrs(mod, info); | |
80a3d1bb | 1874 | |
1da177e4 LT |
1875 | return 0; |
1876 | ||
1ba5c08b | 1877 | out_unreg_modinfo_attrs: |
bc6f2a75 | 1878 | module_remove_modinfo_attrs(mod, -1); |
e17e0f51 KS |
1879 | out_unreg_param: |
1880 | module_param_sysfs_remove(mod); | |
270a6c4c | 1881 | out_unreg_holders: |
78a2d906 | 1882 | kobject_put(mod->holders_dir); |
270a6c4c | 1883 | out_unreg: |
942e4431 | 1884 | mod_kobject_put(mod); |
80a3d1bb | 1885 | out: |
1da177e4 LT |
1886 | return err; |
1887 | } | |
34e4e2fe DL |
1888 | |
1889 | static void mod_sysfs_fini(struct module *mod) | |
1890 | { | |
8f6d0378 RR |
1891 | remove_notes_attrs(mod); |
1892 | remove_sect_attrs(mod); | |
942e4431 | 1893 | mod_kobject_put(mod); |
34e4e2fe DL |
1894 | } |
1895 | ||
cf2fde7b RR |
1896 | static void init_param_lock(struct module *mod) |
1897 | { | |
1898 | mutex_init(&mod->param_lock); | |
1899 | } | |
8f6d0378 | 1900 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1901 | |
8f6d0378 RR |
1902 | static int mod_sysfs_setup(struct module *mod, |
1903 | const struct load_info *info, | |
6407ebb2 RR |
1904 | struct kernel_param *kparam, |
1905 | unsigned int num_params) | |
1906 | { | |
1907 | return 0; | |
1908 | } | |
1909 | ||
34e4e2fe DL |
1910 | static void mod_sysfs_fini(struct module *mod) |
1911 | { | |
1912 | } | |
1913 | ||
bc6f2a75 | 1914 | static void module_remove_modinfo_attrs(struct module *mod, int end) |
36b0360d RR |
1915 | { |
1916 | } | |
1917 | ||
80a3d1bb RR |
1918 | static void del_usage_links(struct module *mod) |
1919 | { | |
1920 | } | |
1921 | ||
cf2fde7b RR |
1922 | static void init_param_lock(struct module *mod) |
1923 | { | |
1924 | } | |
34e4e2fe | 1925 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1926 | |
36b0360d | 1927 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1928 | { |
80a3d1bb | 1929 | del_usage_links(mod); |
bc6f2a75 | 1930 | module_remove_modinfo_attrs(mod, -1); |
1da177e4 | 1931 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1932 | kobject_put(mod->mkobj.drivers_dir); |
1933 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1934 | mod_sysfs_fini(mod); |
1da177e4 LT |
1935 | } |
1936 | ||
84e1c6bb MC |
1937 | /* |
1938 | * LKM RO/NX protection: protect module's text/ro-data | |
1939 | * from modification and any data from execution. | |
85c898db RR |
1940 | * |
1941 | * General layout of module is: | |
444d13ff JY |
1942 | * [text] [read-only-data] [ro-after-init] [writable data] |
1943 | * text_size -----^ ^ ^ ^ | |
1944 | * ro_size ------------------------| | | | |
1945 | * ro_after_init_size -----------------------------| | | |
1946 | * size -----------------------------------------------------------| | |
85c898db RR |
1947 | * |
1948 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1949 | */ |
db991af0 JY |
1950 | |
1951 | /* | |
1952 | * Since some arches are moving towards PAGE_KERNEL module allocations instead | |
1953 | * of PAGE_KERNEL_EXEC, keep frob_text() and module_enable_x() outside of the | |
1954 | * CONFIG_STRICT_MODULE_RWX block below because they are needed regardless of | |
1955 | * whether we are strict. | |
1956 | */ | |
1957 | #ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX | |
85c898db RR |
1958 | static void frob_text(const struct module_layout *layout, |
1959 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1960 | { |
85c898db RR |
1961 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1962 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1963 | set_memory((unsigned long)layout->base, | |
1964 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1965 | } |
84e1c6bb | 1966 | |
db991af0 JY |
1967 | static void module_enable_x(const struct module *mod) |
1968 | { | |
1969 | frob_text(&mod->core_layout, set_memory_x); | |
1970 | frob_text(&mod->init_layout, set_memory_x); | |
1971 | } | |
1972 | #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
1973 | static void module_enable_x(const struct module *mod) { } | |
1974 | #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ | |
1975 | ||
93651f80 | 1976 | #ifdef CONFIG_STRICT_MODULE_RWX |
85c898db RR |
1977 | static void frob_rodata(const struct module_layout *layout, |
1978 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1979 | { |
85c898db RR |
1980 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1981 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1982 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1983 | set_memory((unsigned long)layout->base + layout->text_size, | |
1984 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb MC |
1985 | } |
1986 | ||
444d13ff JY |
1987 | static void frob_ro_after_init(const struct module_layout *layout, |
1988 | int (*set_memory)(unsigned long start, int num_pages)) | |
1989 | { | |
1990 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1991 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1992 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1993 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1994 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1995 | } | |
1996 | ||
85c898db RR |
1997 | static void frob_writable_data(const struct module_layout *layout, |
1998 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1999 | { |
85c898db | 2000 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 2001 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 2002 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
2003 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
2004 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 2005 | } |
84e1c6bb | 2006 | |
e6eff437 | 2007 | static void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 2008 | { |
39290b38 AT |
2009 | if (!rodata_enabled) |
2010 | return; | |
2011 | ||
1a7b7d92 RE |
2012 | set_vm_flush_reset_perms(mod->core_layout.base); |
2013 | set_vm_flush_reset_perms(mod->init_layout.base); | |
85c898db | 2014 | frob_text(&mod->core_layout, set_memory_ro); |
f2c65fb3 | 2015 | |
85c898db RR |
2016 | frob_rodata(&mod->core_layout, set_memory_ro); |
2017 | frob_text(&mod->init_layout, set_memory_ro); | |
2018 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
2019 | |
2020 | if (after_init) | |
2021 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb MC |
2022 | } |
2023 | ||
85c898db | 2024 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 2025 | { |
85c898db | 2026 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 2027 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
2028 | frob_writable_data(&mod->core_layout, set_memory_nx); |
2029 | frob_rodata(&mod->init_layout, set_memory_nx); | |
2030 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
2031 | } |
2032 | ||
5c3a7db0 PZ |
2033 | static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, |
2034 | char *secstrings, struct module *mod) | |
2035 | { | |
2036 | const unsigned long shf_wx = SHF_WRITE|SHF_EXECINSTR; | |
2037 | int i; | |
2038 | ||
2039 | for (i = 0; i < hdr->e_shnum; i++) { | |
14721add QW |
2040 | if ((sechdrs[i].sh_flags & shf_wx) == shf_wx) { |
2041 | pr_err("%s: section %s (index %d) has invalid WRITE|EXEC flags\n", | |
2042 | mod->name, secstrings + sechdrs[i].sh_name, i); | |
5c3a7db0 | 2043 | return -ENOEXEC; |
14721add | 2044 | } |
5c3a7db0 PZ |
2045 | } |
2046 | ||
2047 | return 0; | |
2048 | } | |
2049 | ||
93651f80 | 2050 | #else /* !CONFIG_STRICT_MODULE_RWX */ |
85c898db | 2051 | static void module_enable_nx(const struct module *mod) { } |
e6eff437 | 2052 | static void module_enable_ro(const struct module *mod, bool after_init) {} |
5c3a7db0 PZ |
2053 | static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, |
2054 | char *secstrings, struct module *mod) | |
2eef1399 | 2055 | { |
5c3a7db0 | 2056 | return 0; |
2eef1399 | 2057 | } |
93651f80 | 2058 | #endif /* CONFIG_STRICT_MODULE_RWX */ |
84e1c6bb | 2059 | |
1ce15ef4 JY |
2060 | #ifdef CONFIG_LIVEPATCH |
2061 | /* | |
2062 | * Persist Elf information about a module. Copy the Elf header, | |
2063 | * section header table, section string table, and symtab section | |
2064 | * index from info to mod->klp_info. | |
2065 | */ | |
2066 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2067 | { | |
2068 | unsigned int size, symndx; | |
2069 | int ret; | |
2070 | ||
2071 | size = sizeof(*mod->klp_info); | |
2072 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2073 | if (mod->klp_info == NULL) | |
2074 | return -ENOMEM; | |
2075 | ||
2076 | /* Elf header */ | |
2077 | size = sizeof(mod->klp_info->hdr); | |
2078 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2079 | ||
2080 | /* Elf section header table */ | |
2081 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
9be936f4 | 2082 | mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
1ce15ef4 JY |
2083 | if (mod->klp_info->sechdrs == NULL) { |
2084 | ret = -ENOMEM; | |
2085 | goto free_info; | |
2086 | } | |
1ce15ef4 JY |
2087 | |
2088 | /* Elf section name string table */ | |
2089 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
9be936f4 | 2090 | mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
1ce15ef4 JY |
2091 | if (mod->klp_info->secstrings == NULL) { |
2092 | ret = -ENOMEM; | |
2093 | goto free_sechdrs; | |
2094 | } | |
1ce15ef4 JY |
2095 | |
2096 | /* Elf symbol section index */ | |
2097 | symndx = info->index.sym; | |
2098 | mod->klp_info->symndx = symndx; | |
2099 | ||
2100 | /* | |
2101 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2102 | * copy of the original symbol table. Adjust sh_addr to point | |
2103 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2104 | * init memory is freed at the end of do_init_module(). | |
2105 | */ | |
2106 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2107 | (unsigned long) mod->core_kallsyms.symtab; | |
2108 | ||
2109 | return 0; | |
2110 | ||
2111 | free_sechdrs: | |
2112 | kfree(mod->klp_info->sechdrs); | |
2113 | free_info: | |
2114 | kfree(mod->klp_info); | |
2115 | return ret; | |
2116 | } | |
2117 | ||
2118 | static void free_module_elf(struct module *mod) | |
2119 | { | |
2120 | kfree(mod->klp_info->sechdrs); | |
2121 | kfree(mod->klp_info->secstrings); | |
2122 | kfree(mod->klp_info); | |
2123 | } | |
2124 | #else /* !CONFIG_LIVEPATCH */ | |
2125 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2126 | { | |
2127 | return 0; | |
2128 | } | |
2129 | ||
2130 | static void free_module_elf(struct module *mod) | |
2131 | { | |
2132 | } | |
2133 | #endif /* CONFIG_LIVEPATCH */ | |
2134 | ||
be1f221c | 2135 | void __weak module_memfree(void *module_region) |
74e08fcf | 2136 | { |
1a7b7d92 RE |
2137 | /* |
2138 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
2139 | * supported by vmalloc. | |
2140 | */ | |
2141 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
2142 | vfree(module_region); |
2143 | } | |
2144 | ||
2145 | void __weak module_arch_cleanup(struct module *mod) | |
2146 | { | |
2147 | } | |
2148 | ||
d453cded RR |
2149 | void __weak module_arch_freeing_init(struct module *mod) |
2150 | { | |
2151 | } | |
2152 | ||
cf68fffb ST |
2153 | static void cfi_cleanup(struct module *mod); |
2154 | ||
75676500 | 2155 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2156 | static void free_module(struct module *mod) |
2157 | { | |
7ead8b83 LZ |
2158 | trace_module_free(mod); |
2159 | ||
36b0360d | 2160 | mod_sysfs_teardown(mod); |
1da177e4 | 2161 | |
24b9f0d2 SS |
2162 | /* |
2163 | * We leave it in list to prevent duplicate loads, but make sure | |
2164 | * that noone uses it while it's being deconstructed. | |
2165 | */ | |
d3051b48 | 2166 | mutex_lock(&module_mutex); |
944a1fa0 | 2167 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2168 | mutex_unlock(&module_mutex); |
944a1fa0 | 2169 | |
b82bab4b JB |
2170 | /* Remove dynamic debug info */ |
2171 | ddebug_remove_module(mod->name); | |
2172 | ||
1da177e4 LT |
2173 | /* Arch-specific cleanup. */ |
2174 | module_arch_cleanup(mod); | |
2175 | ||
2176 | /* Module unload stuff */ | |
2177 | module_unload_free(mod); | |
2178 | ||
e180a6b7 RR |
2179 | /* Free any allocated parameters. */ |
2180 | destroy_params(mod->kp, mod->num_kp); | |
2181 | ||
1ce15ef4 JY |
2182 | if (is_livepatch_module(mod)) |
2183 | free_module_elf(mod); | |
2184 | ||
944a1fa0 RR |
2185 | /* Now we can delete it from the lists */ |
2186 | mutex_lock(&module_mutex); | |
461e34ae MH |
2187 | /* Unlink carefully: kallsyms could be walking list. */ |
2188 | list_del_rcu(&mod->list); | |
93c2e105 | 2189 | mod_tree_remove(mod); |
0286b5ea | 2190 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2191 | module_bug_cleanup(mod); |
0be964be | 2192 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 2193 | synchronize_rcu(); |
944a1fa0 RR |
2194 | mutex_unlock(&module_mutex); |
2195 | ||
cf68fffb ST |
2196 | /* Clean up CFI for the module. */ |
2197 | cfi_cleanup(mod); | |
2198 | ||
85c898db | 2199 | /* This may be empty, but that's OK */ |
d453cded | 2200 | module_arch_freeing_init(mod); |
7523e4dc | 2201 | module_memfree(mod->init_layout.base); |
1da177e4 | 2202 | kfree(mod->args); |
259354de | 2203 | percpu_modfree(mod); |
9f85a4bb | 2204 | |
35a9393c | 2205 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2206 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2207 | |
1da177e4 | 2208 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 2209 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
2210 | } |
2211 | ||
2212 | void *__symbol_get(const char *symbol) | |
2213 | { | |
0b96615c CH |
2214 | struct find_symbol_arg fsa = { |
2215 | .name = symbol, | |
2216 | .gplok = true, | |
2217 | .warn = true, | |
2218 | }; | |
1da177e4 | 2219 | |
24da1cbf | 2220 | preempt_disable(); |
0b96615c CH |
2221 | if (!find_symbol(&fsa) || strong_try_module_get(fsa.owner)) { |
2222 | preempt_enable(); | |
2223 | return NULL; | |
2224 | } | |
24da1cbf | 2225 | preempt_enable(); |
0b96615c | 2226 | return (void *)kernel_symbol_value(fsa.sym); |
1da177e4 LT |
2227 | } |
2228 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2229 | ||
eea8b54d AN |
2230 | /* |
2231 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2232 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2233 | * |
2234 | * You must hold the module_mutex. | |
eea8b54d | 2235 | */ |
2d25bc55 | 2236 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 2237 | { |
b211104d | 2238 | unsigned int i; |
b211104d RR |
2239 | const struct kernel_symbol *s; |
2240 | struct { | |
2241 | const struct kernel_symbol *sym; | |
2242 | unsigned int num; | |
2243 | } arr[] = { | |
2244 | { mod->syms, mod->num_syms }, | |
2245 | { mod->gpl_syms, mod->num_gpl_syms }, | |
b211104d | 2246 | }; |
eea8b54d | 2247 | |
b211104d RR |
2248 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2249 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
0b96615c CH |
2250 | struct find_symbol_arg fsa = { |
2251 | .name = kernel_symbol_name(s), | |
2252 | .gplok = true, | |
2253 | }; | |
2254 | if (find_symbol(&fsa)) { | |
bddb12b3 | 2255 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 2256 | " (owned by %s)\n", |
7290d580 | 2257 | mod->name, kernel_symbol_name(s), |
0b96615c | 2258 | module_name(fsa.owner)); |
b211104d RR |
2259 | return -ENOEXEC; |
2260 | } | |
eea8b54d | 2261 | } |
b211104d RR |
2262 | } |
2263 | return 0; | |
eea8b54d AN |
2264 | } |
2265 | ||
ebfac7b7 FS |
2266 | static bool ignore_undef_symbol(Elf_Half emachine, const char *name) |
2267 | { | |
2268 | /* | |
2269 | * On x86, PIC code and Clang non-PIC code may have call foo@PLT. GNU as | |
2270 | * before 2.37 produces an unreferenced _GLOBAL_OFFSET_TABLE_ on x86-64. | |
2271 | * i386 has a similar problem but may not deserve a fix. | |
2272 | * | |
2273 | * If we ever have to ignore many symbols, consider refactoring the code to | |
2274 | * only warn if referenced by a relocation. | |
2275 | */ | |
2276 | if (emachine == EM_386 || emachine == EM_X86_64) | |
2277 | return !strcmp(name, "_GLOBAL_OFFSET_TABLE_"); | |
2278 | return false; | |
2279 | } | |
2280 | ||
9a4b9708 | 2281 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2282 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2283 | { | |
2284 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2285 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2286 | unsigned long secbase; |
49668688 | 2287 | unsigned int i; |
1da177e4 | 2288 | int ret = 0; |
414fd31b | 2289 | const struct kernel_symbol *ksym; |
1da177e4 | 2290 | |
49668688 RR |
2291 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2292 | const char *name = info->strtab + sym[i].st_name; | |
2293 | ||
1da177e4 LT |
2294 | switch (sym[i].st_shndx) { |
2295 | case SHN_COMMON: | |
80375980 JM |
2296 | /* Ignore common symbols */ |
2297 | if (!strncmp(name, "__gnu_lto", 9)) | |
2298 | break; | |
2299 | ||
24b9f0d2 SS |
2300 | /* |
2301 | * We compiled with -fno-common. These are not | |
2302 | * supposed to happen. | |
2303 | */ | |
5e124169 | 2304 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2305 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2306 | mod->name); |
2307 | ret = -ENOEXEC; | |
2308 | break; | |
2309 | ||
2310 | case SHN_ABS: | |
2311 | /* Don't need to do anything */ | |
5e124169 | 2312 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2313 | (long)sym[i].st_value); |
2314 | break; | |
2315 | ||
1ce15ef4 JY |
2316 | case SHN_LIVEPATCH: |
2317 | /* Livepatch symbols are resolved by livepatch */ | |
2318 | break; | |
2319 | ||
1da177e4 | 2320 | case SHN_UNDEF: |
49668688 | 2321 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2322 | /* Ok if resolved. */ |
9bea7f23 | 2323 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 2324 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 2325 | break; |
414fd31b TA |
2326 | } |
2327 | ||
ebfac7b7 FS |
2328 | /* Ok if weak or ignored. */ |
2329 | if (!ksym && | |
2330 | (ELF_ST_BIND(sym[i].st_info) == STB_WEAK || | |
2331 | ignore_undef_symbol(info->hdr->e_machine, name))) | |
1da177e4 LT |
2332 | break; |
2333 | ||
9bea7f23 | 2334 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
2335 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
2336 | mod->name, name, ret); | |
1da177e4 LT |
2337 | break; |
2338 | ||
2339 | default: | |
2340 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2341 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2342 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2343 | else |
49668688 | 2344 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2345 | sym[i].st_value += secbase; |
2346 | break; | |
2347 | } | |
2348 | } | |
2349 | ||
2350 | return ret; | |
2351 | } | |
2352 | ||
49668688 | 2353 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2354 | { |
2355 | unsigned int i; | |
2356 | int err = 0; | |
2357 | ||
2358 | /* Now do relocations. */ | |
49668688 RR |
2359 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2360 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2361 | |
2362 | /* Not a valid relocation section? */ | |
49668688 | 2363 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2364 | continue; |
2365 | ||
2366 | /* Don't bother with non-allocated sections */ | |
49668688 | 2367 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2368 | continue; |
2369 | ||
1ce15ef4 | 2370 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) |
7c8e2bdd JP |
2371 | err = klp_apply_section_relocs(mod, info->sechdrs, |
2372 | info->secstrings, | |
2373 | info->strtab, | |
2374 | info->index.sym, i, | |
2375 | NULL); | |
2376 | else if (info->sechdrs[i].sh_type == SHT_REL) | |
49668688 RR |
2377 | err = apply_relocate(info->sechdrs, info->strtab, |
2378 | info->index.sym, i, mod); | |
2379 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2380 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2381 | info->index.sym, i, mod); | |
22e268eb RR |
2382 | if (err < 0) |
2383 | break; | |
2384 | } | |
2385 | return err; | |
2386 | } | |
2387 | ||
088af9a6 HD |
2388 | /* Additional bytes needed by arch in front of individual sections */ |
2389 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2390 | unsigned int section) | |
2391 | { | |
2392 | /* default implementation just returns zero */ | |
2393 | return 0; | |
2394 | } | |
2395 | ||
1da177e4 | 2396 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2397 | static long get_offset(struct module *mod, unsigned int *size, |
2398 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2399 | { |
2400 | long ret; | |
2401 | ||
088af9a6 | 2402 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2403 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2404 | *size = ret + sechdr->sh_size; | |
2405 | return ret; | |
2406 | } | |
2407 | ||
055f23b7 JY |
2408 | static bool module_init_layout_section(const char *sname) |
2409 | { | |
2410 | #ifndef CONFIG_MODULE_UNLOAD | |
2411 | if (module_exit_section(sname)) | |
2412 | return true; | |
2413 | #endif | |
2414 | return module_init_section(sname); | |
2415 | } | |
2416 | ||
24b9f0d2 SS |
2417 | /* |
2418 | * Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2419 | * might -- code, read-only data, read-write data, small data. Tally | |
2420 | * sizes, and place the offsets into sh_entsize fields: high bit means it | |
2421 | * belongs in init. | |
2422 | */ | |
49668688 | 2423 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2424 | { |
2425 | static unsigned long const masks[][2] = { | |
24b9f0d2 SS |
2426 | /* |
2427 | * NOTE: all executable code must be the first section | |
1da177e4 | 2428 | * in this array; otherwise modify the text_size |
24b9f0d2 SS |
2429 | * finder in the two loops below |
2430 | */ | |
1da177e4 LT |
2431 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
2432 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2433 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2434 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2435 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2436 | }; | |
2437 | unsigned int m, i; | |
2438 | ||
49668688 RR |
2439 | for (i = 0; i < info->hdr->e_shnum; i++) |
2440 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2441 | |
5e124169 | 2442 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2443 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2444 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2445 | Elf_Shdr *s = &info->sechdrs[i]; | |
2446 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2447 | |
2448 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2449 | || (s->sh_flags & masks[m][1]) | |
2450 | || s->sh_entsize != ~0UL | |
055f23b7 | 2451 | || module_init_layout_section(sname)) |
1da177e4 | 2452 | continue; |
7523e4dc | 2453 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2454 | pr_debug("\t%s\n", sname); |
1da177e4 | 2455 | } |
84e1c6bb MC |
2456 | switch (m) { |
2457 | case 0: /* executable */ | |
7523e4dc RR |
2458 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2459 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb MC |
2460 | break; |
2461 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2462 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2463 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2464 | break; |
444d13ff JY |
2465 | case 2: /* RO after init */ |
2466 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2467 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2468 | break; | |
2469 | case 4: /* whole core */ | |
7523e4dc | 2470 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb MC |
2471 | break; |
2472 | } | |
1da177e4 LT |
2473 | } |
2474 | ||
5e124169 | 2475 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2476 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2477 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2478 | Elf_Shdr *s = &info->sechdrs[i]; | |
2479 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2480 | |
2481 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2482 | || (s->sh_flags & masks[m][1]) | |
2483 | || s->sh_entsize != ~0UL | |
055f23b7 | 2484 | || !module_init_layout_section(sname)) |
1da177e4 | 2485 | continue; |
7523e4dc | 2486 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2487 | | INIT_OFFSET_MASK); |
5e124169 | 2488 | pr_debug("\t%s\n", sname); |
1da177e4 | 2489 | } |
84e1c6bb MC |
2490 | switch (m) { |
2491 | case 0: /* executable */ | |
7523e4dc RR |
2492 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2493 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb MC |
2494 | break; |
2495 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2496 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2497 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2498 | break; |
444d13ff JY |
2499 | case 2: |
2500 | /* | |
2501 | * RO after init doesn't apply to init_layout (only | |
2502 | * core_layout), so it just takes the value of ro_size. | |
2503 | */ | |
2504 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2505 | break; | |
2506 | case 4: /* whole init */ | |
7523e4dc | 2507 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb MC |
2508 | break; |
2509 | } | |
1da177e4 LT |
2510 | } |
2511 | } | |
2512 | ||
1da177e4 LT |
2513 | static void set_license(struct module *mod, const char *license) |
2514 | { | |
2515 | if (!license) | |
2516 | license = "unspecified"; | |
2517 | ||
fa3ba2e8 | 2518 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2519 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2520 | pr_warn("%s: module license '%s' taints kernel.\n", |
2521 | mod->name, license); | |
373d4d09 RR |
2522 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2523 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2524 | } |
2525 | } | |
2526 | ||
2527 | /* Parse tag=value strings from .modinfo section */ | |
2528 | static char *next_string(char *string, unsigned long *secsize) | |
2529 | { | |
2530 | /* Skip non-zero chars */ | |
2531 | while (string[0]) { | |
2532 | string++; | |
2533 | if ((*secsize)-- <= 1) | |
2534 | return NULL; | |
2535 | } | |
2536 | ||
2537 | /* Skip any zero padding. */ | |
2538 | while (!string[0]) { | |
2539 | string++; | |
2540 | if ((*secsize)-- <= 1) | |
2541 | return NULL; | |
2542 | } | |
2543 | return string; | |
2544 | } | |
2545 | ||
c5e4a062 MM |
2546 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
2547 | char *prev) | |
1da177e4 LT |
2548 | { |
2549 | char *p; | |
2550 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2551 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2552 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2553 | |
5fdc7db6 JY |
2554 | /* |
2555 | * get_modinfo() calls made before rewrite_section_headers() | |
2556 | * must use sh_offset, as sh_addr isn't set! | |
2557 | */ | |
c5e4a062 MM |
2558 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
2559 | ||
2560 | if (prev) { | |
2561 | size -= prev - modinfo; | |
2562 | modinfo = next_string(prev, &size); | |
2563 | } | |
2564 | ||
2565 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
2566 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2567 | return p + taglen + 1; | |
2568 | } | |
2569 | return NULL; | |
2570 | } | |
2571 | ||
c5e4a062 MM |
2572 | static char *get_modinfo(const struct load_info *info, const char *tag) |
2573 | { | |
2574 | return get_next_modinfo(info, tag, NULL); | |
2575 | } | |
2576 | ||
49668688 | 2577 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2578 | { |
2579 | struct module_attribute *attr; | |
2580 | int i; | |
2581 | ||
2582 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2583 | if (attr->setup) | |
49668688 | 2584 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2585 | } |
2586 | } | |
c988d2b2 | 2587 | |
a263f776 RR |
2588 | static void free_modinfo(struct module *mod) |
2589 | { | |
2590 | struct module_attribute *attr; | |
2591 | int i; | |
2592 | ||
2593 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2594 | if (attr->free) | |
2595 | attr->free(mod); | |
2596 | } | |
2597 | } | |
2598 | ||
1da177e4 | 2599 | #ifdef CONFIG_KALLSYMS |
15bba37d | 2600 | |
2d25bc55 JY |
2601 | /* Lookup exported symbol in given range of kernel_symbols */ |
2602 | static const struct kernel_symbol *lookup_exported_symbol(const char *name, | |
2603 | const struct kernel_symbol *start, | |
2604 | const struct kernel_symbol *stop) | |
15bba37d | 2605 | { |
9d63487f AIB |
2606 | return bsearch(name, start, stop - start, |
2607 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2608 | } |
2609 | ||
ca4787b7 TA |
2610 | static int is_exported(const char *name, unsigned long value, |
2611 | const struct module *mod) | |
1da177e4 | 2612 | { |
ca4787b7 TA |
2613 | const struct kernel_symbol *ks; |
2614 | if (!mod) | |
2d25bc55 | 2615 | ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f | 2616 | else |
2d25bc55 JY |
2617 | ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2618 | ||
7290d580 | 2619 | return ks != NULL && kernel_symbol_value(ks) == value; |
1da177e4 LT |
2620 | } |
2621 | ||
2622 | /* As per nm */ | |
eded41c1 | 2623 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2624 | { |
eded41c1 RR |
2625 | const Elf_Shdr *sechdrs = info->sechdrs; |
2626 | ||
1da177e4 LT |
2627 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2628 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2629 | return 'v'; | |
2630 | else | |
2631 | return 'w'; | |
2632 | } | |
2633 | if (sym->st_shndx == SHN_UNDEF) | |
2634 | return 'U'; | |
e0224418 | 2635 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2636 | return 'a'; |
2637 | if (sym->st_shndx >= SHN_LORESERVE) | |
2638 | return '?'; | |
2639 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2640 | return 't'; | |
2641 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2642 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2643 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2644 | return 'r'; | |
2645 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2646 | return 'g'; | |
2647 | else | |
2648 | return 'd'; | |
2649 | } | |
2650 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2651 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2652 | return 's'; | |
2653 | else | |
2654 | return 'b'; | |
2655 | } | |
eded41c1 RR |
2656 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2657 | ".debug")) { | |
1da177e4 | 2658 | return 'n'; |
eded41c1 | 2659 | } |
1da177e4 LT |
2660 | return '?'; |
2661 | } | |
2662 | ||
4a496226 | 2663 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2664 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2665 | { |
2666 | const Elf_Shdr *sec; | |
2667 | ||
2668 | if (src->st_shndx == SHN_UNDEF | |
2669 | || src->st_shndx >= shnum | |
2670 | || !src->st_name) | |
2671 | return false; | |
2672 | ||
e0224418 MB |
2673 | #ifdef CONFIG_KALLSYMS_ALL |
2674 | if (src->st_shndx == pcpundx) | |
2675 | return true; | |
2676 | #endif | |
2677 | ||
4a496226 JB |
2678 | sec = sechdrs + src->st_shndx; |
2679 | if (!(sec->sh_flags & SHF_ALLOC) | |
2680 | #ifndef CONFIG_KALLSYMS_ALL | |
2681 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2682 | #endif | |
2683 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2684 | return false; | |
2685 | ||
2686 | return true; | |
2687 | } | |
2688 | ||
48fd1188 KC |
2689 | /* |
2690 | * We only allocate and copy the strings needed by the parts of symtab | |
2691 | * we keep. This is simple, but has the effect of making multiple | |
2692 | * copies of duplicates. We could be more sophisticated, see | |
2693 | * linux-kernel thread starting with | |
2694 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2695 | */ | |
49668688 | 2696 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2697 | { |
49668688 RR |
2698 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2699 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2700 | const Elf_Sym *src; |
54523ec7 | 2701 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2702 | |
2703 | /* Put symbol section at end of init part of module. */ | |
2704 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2705 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2706 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2707 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2708 | |
49668688 | 2709 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2710 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2711 | |
48fd1188 | 2712 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2713 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2714 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2715 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2716 | info->index.pcpu)) { | |
59ef28b1 | 2717 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2718 | ndst++; |
554bdfe5 | 2719 | } |
59ef28b1 | 2720 | } |
4a496226 JB |
2721 | |
2722 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2723 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2724 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2725 | mod->core_layout.size += strtab_size; | |
1c7651f4 EL |
2726 | info->core_typeoffs = mod->core_layout.size; |
2727 | mod->core_layout.size += ndst * sizeof(char); | |
7523e4dc | 2728 | mod->core_layout.size = debug_align(mod->core_layout.size); |
4a496226 | 2729 | |
554bdfe5 JB |
2730 | /* Put string table section at end of init part of module. */ |
2731 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2732 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2733 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2734 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2735 | |
2736 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2737 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2738 | __alignof__(struct mod_kallsyms)); | |
2739 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2740 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
1c7651f4 EL |
2741 | info->init_typeoffs = mod->init_layout.size; |
2742 | mod->init_layout.size += nsrc * sizeof(char); | |
8244062e | 2743 | mod->init_layout.size = debug_align(mod->init_layout.size); |
4a496226 JB |
2744 | } |
2745 | ||
8244062e RR |
2746 | /* |
2747 | * We use the full symtab and strtab which layout_symtab arranged to | |
2748 | * be appended to the init section. Later we switch to the cut-down | |
2749 | * core-only ones. | |
2750 | */ | |
811d66a0 | 2751 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2752 | { |
4a496226 JB |
2753 | unsigned int i, ndst; |
2754 | const Elf_Sym *src; | |
2755 | Elf_Sym *dst; | |
554bdfe5 | 2756 | char *s; |
eded41c1 | 2757 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2758 | |
8244062e RR |
2759 | /* Set up to point into init section. */ |
2760 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2761 | ||
2762 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2763 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2764 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2765 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1c7651f4 | 2766 | mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
1da177e4 | 2767 | |
1c7651f4 EL |
2768 | /* |
2769 | * Now populate the cut down core kallsyms for after init | |
2770 | * and set types up while we still have access to sections. | |
2771 | */ | |
8244062e RR |
2772 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
2773 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
1c7651f4 | 2774 | mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
8244062e RR |
2775 | src = mod->kallsyms->symtab; |
2776 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1c7651f4 | 2777 | mod->kallsyms->typetab[i] = elf_type(src + i, info); |
1ce15ef4 | 2778 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2779 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2780 | info->index.pcpu)) { | |
1c7651f4 EL |
2781 | mod->core_kallsyms.typetab[ndst] = |
2782 | mod->kallsyms->typetab[i]; | |
59ef28b1 | 2783 | dst[ndst] = src[i]; |
8244062e RR |
2784 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2785 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2786 | KSYM_NAME_LEN) + 1; |
2787 | } | |
4a496226 | 2788 | } |
8244062e | 2789 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2790 | } |
2791 | #else | |
49668688 | 2792 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2793 | { |
2794 | } | |
3ae91c21 | 2795 | |
abbce906 | 2796 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2797 | { |
2798 | } | |
2799 | #endif /* CONFIG_KALLSYMS */ | |
2800 | ||
52796312 | 2801 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 2802 | { |
811d66a0 RR |
2803 | if (!debug) |
2804 | return; | |
513770f5 | 2805 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 2806 | } |
346e15be | 2807 | |
52796312 | 2808 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
2809 | { |
2810 | if (debug) | |
52796312 | 2811 | ddebug_remove_module(mod->name); |
ff49d74a YS |
2812 | } |
2813 | ||
74e08fcf JB |
2814 | void * __weak module_alloc(unsigned long size) |
2815 | { | |
7a0e27b2 CH |
2816 | return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, |
2817 | GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, | |
a3a66c38 | 2818 | NUMA_NO_NODE, __builtin_return_address(0)); |
74e08fcf JB |
2819 | } |
2820 | ||
23189766 VW |
2821 | bool __weak module_init_section(const char *name) |
2822 | { | |
2823 | return strstarts(name, ".init"); | |
2824 | } | |
2825 | ||
38b37d63 MS |
2826 | bool __weak module_exit_section(const char *name) |
2827 | { | |
2828 | return strstarts(name, ".exit"); | |
2829 | } | |
2830 | ||
4f2294b6 | 2831 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2832 | static void kmemleak_load_module(const struct module *mod, |
2833 | const struct load_info *info) | |
4f2294b6 CM |
2834 | { |
2835 | unsigned int i; | |
2836 | ||
2837 | /* only scan the sections containing data */ | |
c017b4be | 2838 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2839 | |
49668688 | 2840 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2841 | /* Scan all writable sections that's not executable */ |
2842 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2843 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2844 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2845 | continue; |
2846 | ||
49668688 RR |
2847 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2848 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2849 | } |
2850 | } | |
2851 | #else | |
49668688 RR |
2852 | static inline void kmemleak_load_module(const struct module *mod, |
2853 | const struct load_info *info) | |
4f2294b6 CM |
2854 | { |
2855 | } | |
2856 | #endif | |
2857 | ||
106a4ee2 | 2858 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2859 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 | 2860 | { |
49fcf732 | 2861 | int err = -ENODATA; |
34e1169d | 2862 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
49fcf732 | 2863 | const char *reason; |
34e1169d | 2864 | const void *mod = info->hdr; |
caabe240 | 2865 | |
bca014ca BH |
2866 | /* |
2867 | * Require flags == 0, as a module with version information | |
2868 | * removed is no longer the module that was signed | |
2869 | */ | |
2870 | if (flags == 0 && | |
2871 | info->len > markerlen && | |
34e1169d | 2872 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2873 | /* We truncate the module to discard the signature */ |
34e1169d | 2874 | info->len -= markerlen; |
f314dfea | 2875 | err = mod_verify_sig(mod, info); |
076aa52e SS |
2876 | if (!err) { |
2877 | info->sig_ok = true; | |
2878 | return 0; | |
2879 | } | |
106a4ee2 RR |
2880 | } |
2881 | ||
076aa52e SS |
2882 | /* |
2883 | * We don't permit modules to be loaded into the trusted kernels | |
2884 | * without a valid signature on them, but if we're not enforcing, | |
2885 | * certain errors are non-fatal. | |
2886 | */ | |
49fcf732 | 2887 | switch (err) { |
49fcf732 | 2888 | case -ENODATA: |
705e9195 | 2889 | reason = "unsigned module"; |
10ccd1ab | 2890 | break; |
49fcf732 | 2891 | case -ENOPKG: |
705e9195 | 2892 | reason = "module with unsupported crypto"; |
10ccd1ab | 2893 | break; |
49fcf732 | 2894 | case -ENOKEY: |
705e9195 | 2895 | reason = "module with unavailable key"; |
10ccd1ab | 2896 | break; |
49fcf732 | 2897 | |
49fcf732 | 2898 | default: |
076aa52e SS |
2899 | /* |
2900 | * All other errors are fatal, including lack of memory, | |
2901 | * unparseable signatures, and signature check failures -- | |
2902 | * even if signatures aren't required. | |
2903 | */ | |
49fcf732 DH |
2904 | return err; |
2905 | } | |
10ccd1ab SS |
2906 | |
2907 | if (is_module_sig_enforced()) { | |
ec2a2959 | 2908 | pr_notice("Loading of %s is rejected\n", reason); |
10ccd1ab SS |
2909 | return -EKEYREJECTED; |
2910 | } | |
2911 | ||
2912 | return security_locked_down(LOCKDOWN_MODULE_SIGNATURE); | |
106a4ee2 RR |
2913 | } |
2914 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2915 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2916 | { |
2917 | return 0; | |
2918 | } | |
2919 | #endif /* !CONFIG_MODULE_SIG */ | |
2920 | ||
ec2a2959 | 2921 | static int validate_section_offset(struct load_info *info, Elf_Shdr *shdr) |
40dd2560 | 2922 | { |
ec2a2959 FL |
2923 | unsigned long secend; |
2924 | ||
2925 | /* | |
2926 | * Check for both overflow and offset/size being | |
2927 | * too large. | |
2928 | */ | |
2929 | secend = shdr->sh_offset + shdr->sh_size; | |
2930 | if (secend < shdr->sh_offset || secend > info->len) | |
2931 | return -ENOEXEC; | |
2932 | ||
2933 | return 0; | |
2934 | } | |
2935 | ||
2936 | /* | |
2937 | * Sanity checks against invalid binaries, wrong arch, weird elf version. | |
2938 | * | |
2939 | * Also do basic validity checks against section offsets and sizes, the | |
2940 | * section name string table, and the indices used for it (sh_name). | |
2941 | */ | |
2942 | static int elf_validity_check(struct load_info *info) | |
2943 | { | |
2944 | unsigned int i; | |
2945 | Elf_Shdr *shdr, *strhdr; | |
2946 | int err; | |
2947 | ||
34e1169d KC |
2948 | if (info->len < sizeof(*(info->hdr))) |
2949 | return -ENOEXEC; | |
2950 | ||
2951 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2952 | || info->hdr->e_type != ET_REL | |
2953 | || !elf_check_arch(info->hdr) | |
2954 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2955 | return -ENOEXEC; | |
2956 | ||
ec2a2959 FL |
2957 | /* |
2958 | * e_shnum is 16 bits, and sizeof(Elf_Shdr) is | |
2959 | * known and small. So e_shnum * sizeof(Elf_Shdr) | |
2960 | * will not overflow unsigned long on any platform. | |
2961 | */ | |
34e1169d KC |
2962 | if (info->hdr->e_shoff >= info->len |
2963 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2964 | info->len - info->hdr->e_shoff)) | |
2965 | return -ENOEXEC; | |
40dd2560 | 2966 | |
ec2a2959 FL |
2967 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; |
2968 | ||
2969 | /* | |
2970 | * Verify if the section name table index is valid. | |
2971 | */ | |
2972 | if (info->hdr->e_shstrndx == SHN_UNDEF | |
2973 | || info->hdr->e_shstrndx >= info->hdr->e_shnum) | |
2974 | return -ENOEXEC; | |
2975 | ||
2976 | strhdr = &info->sechdrs[info->hdr->e_shstrndx]; | |
2977 | err = validate_section_offset(info, strhdr); | |
2978 | if (err < 0) | |
2979 | return err; | |
2980 | ||
2981 | /* | |
2982 | * The section name table must be NUL-terminated, as required | |
2983 | * by the spec. This makes strcmp and pr_* calls that access | |
2984 | * strings in the section safe. | |
2985 | */ | |
2986 | info->secstrings = (void *)info->hdr + strhdr->sh_offset; | |
2987 | if (info->secstrings[strhdr->sh_size - 1] != '\0') | |
2988 | return -ENOEXEC; | |
2989 | ||
2990 | /* | |
2991 | * The code assumes that section 0 has a length of zero and | |
2992 | * an addr of zero, so check for it. | |
2993 | */ | |
2994 | if (info->sechdrs[0].sh_type != SHT_NULL | |
2995 | || info->sechdrs[0].sh_size != 0 | |
2996 | || info->sechdrs[0].sh_addr != 0) | |
2997 | return -ENOEXEC; | |
2998 | ||
2999 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3000 | shdr = &info->sechdrs[i]; | |
3001 | switch (shdr->sh_type) { | |
3002 | case SHT_NULL: | |
3003 | case SHT_NOBITS: | |
3004 | continue; | |
3005 | case SHT_SYMTAB: | |
3006 | if (shdr->sh_link == SHN_UNDEF | |
3007 | || shdr->sh_link >= info->hdr->e_shnum) | |
3008 | return -ENOEXEC; | |
3009 | fallthrough; | |
3010 | default: | |
3011 | err = validate_section_offset(info, shdr); | |
3012 | if (err < 0) { | |
3013 | pr_err("Invalid ELF section in module (section %u type %u)\n", | |
3014 | i, shdr->sh_type); | |
3015 | return err; | |
3016 | } | |
3017 | ||
3018 | if (shdr->sh_flags & SHF_ALLOC) { | |
3019 | if (shdr->sh_name >= strhdr->sh_size) { | |
3020 | pr_err("Invalid ELF section name in module (section %u type %u)\n", | |
3021 | i, shdr->sh_type); | |
3022 | return -ENOEXEC; | |
3023 | } | |
3024 | } | |
3025 | break; | |
3026 | } | |
3027 | } | |
3028 | ||
34e1169d KC |
3029 | return 0; |
3030 | } | |
3031 | ||
3afe9f84 LT |
3032 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
3033 | ||
3034 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
3035 | { | |
3036 | do { | |
3037 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
3038 | ||
3039 | if (copy_from_user(dst, usrc, n) != 0) | |
3040 | return -EFAULT; | |
3041 | cond_resched(); | |
3042 | dst += n; | |
3043 | usrc += n; | |
3044 | len -= n; | |
3045 | } while (len); | |
3046 | return 0; | |
3047 | } | |
3048 | ||
1ce15ef4 | 3049 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 3050 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 3051 | { |
2992ef29 JP |
3052 | if (get_modinfo(info, "livepatch")) { |
3053 | mod->klp = true; | |
3054 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
3055 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
3056 | mod->name); | |
2992ef29 | 3057 | } |
1ce15ef4 JY |
3058 | |
3059 | return 0; | |
3060 | } | |
3061 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 3062 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
3063 | { |
3064 | if (get_modinfo(info, "livepatch")) { | |
3065 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
3066 | mod->name); | |
3067 | return -ENOEXEC; | |
3068 | } | |
3069 | ||
3070 | return 0; | |
3071 | } | |
3072 | #endif /* CONFIG_LIVEPATCH */ | |
3073 | ||
caf7501a AK |
3074 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
3075 | { | |
3076 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
3077 | return; | |
3078 | ||
3079 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
3080 | mod->name); | |
3081 | } | |
3082 | ||
34e1169d KC |
3083 | /* Sets info->hdr and info->len. */ |
3084 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
3085 | struct load_info *info) | |
40dd2560 RR |
3086 | { |
3087 | int err; | |
40dd2560 | 3088 | |
34e1169d KC |
3089 | info->len = len; |
3090 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
3091 | return -ENOEXEC; |
3092 | ||
38f90173 | 3093 | err = security_kernel_load_data(LOADING_MODULE, true); |
2e72d51b KC |
3094 | if (err) |
3095 | return err; | |
3096 | ||
40dd2560 | 3097 | /* Suck in entire file: we'll want most of it. */ |
88dca4ca | 3098 | info->hdr = __vmalloc(info->len, GFP_KERNEL | __GFP_NOWARN); |
34e1169d | 3099 | if (!info->hdr) |
40dd2560 RR |
3100 | return -ENOMEM; |
3101 | ||
3afe9f84 | 3102 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
38f90173 KC |
3103 | err = -EFAULT; |
3104 | goto out; | |
40dd2560 RR |
3105 | } |
3106 | ||
38f90173 KC |
3107 | err = security_kernel_post_load_data((char *)info->hdr, info->len, |
3108 | LOADING_MODULE, "init_module"); | |
3109 | out: | |
3110 | if (err) | |
3111 | vfree(info->hdr); | |
3112 | ||
3113 | return err; | |
34e1169d KC |
3114 | } |
3115 | ||
d913188c RR |
3116 | static void free_copy(struct load_info *info) |
3117 | { | |
d913188c RR |
3118 | vfree(info->hdr); |
3119 | } | |
3120 | ||
2f3238ae | 3121 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
3122 | { |
3123 | unsigned int i; | |
3124 | ||
3125 | /* This should always be true, but let's be sure. */ | |
3126 | info->sechdrs[0].sh_addr = 0; | |
3127 | ||
3128 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3129 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
8b5f61a7 | 3130 | |
24b9f0d2 SS |
3131 | /* |
3132 | * Mark all sections sh_addr with their address in the | |
3133 | * temporary image. | |
3134 | */ | |
8b5f61a7 RR |
3135 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; |
3136 | ||
8b5f61a7 | 3137 | } |
d6df72a0 RR |
3138 | |
3139 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 3140 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 3141 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 3142 | |
8b5f61a7 RR |
3143 | return 0; |
3144 | } | |
3145 | ||
3264d3f9 LT |
3146 | /* |
3147 | * Set up our basic convenience variables (pointers to section headers, | |
3148 | * search for module section index etc), and do some basic section | |
3149 | * verification. | |
3150 | * | |
81a0abd9 JY |
3151 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
3152 | * will be allocated in move_module(). | |
3264d3f9 | 3153 | */ |
81a0abd9 | 3154 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
3155 | { |
3156 | unsigned int i; | |
3264d3f9 | 3157 | |
5fdc7db6 JY |
3158 | /* Try to find a name early so we can log errors with a module name */ |
3159 | info->index.info = find_sec(info, ".modinfo"); | |
708e0ada | 3160 | if (info->index.info) |
5fdc7db6 | 3161 | info->name = get_modinfo(info, "name"); |
3264d3f9 | 3162 | |
8b5f61a7 RR |
3163 | /* Find internal symbols and strings. */ |
3164 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
3165 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
3166 | info->index.sym = i; | |
3167 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
3168 | info->strtab = (char *)info->hdr |
3169 | + info->sechdrs[info->index.str].sh_offset; | |
3170 | break; | |
3264d3f9 | 3171 | } |
3264d3f9 LT |
3172 | } |
3173 | ||
5fdc7db6 | 3174 | if (info->index.sym == 0) { |
708e0ada JY |
3175 | pr_warn("%s: module has no symbols (stripped?)\n", |
3176 | info->name ?: "(missing .modinfo section or name field)"); | |
5fdc7db6 JY |
3177 | return -ENOEXEC; |
3178 | } | |
3179 | ||
49668688 | 3180 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 3181 | if (!info->index.mod) { |
3e2e857f | 3182 | pr_warn("%s: No module found in object\n", |
708e0ada | 3183 | info->name ?: "(missing .modinfo section or name field)"); |
81a0abd9 | 3184 | return -ENOEXEC; |
3264d3f9 LT |
3185 | } |
3186 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 3187 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 3188 | |
3e2e857f | 3189 | /* |
5fdc7db6 | 3190 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
3191 | * on-disk struct mod 'name' field. |
3192 | */ | |
3193 | if (!info->name) | |
81a0abd9 | 3194 | info->name = info->mod->name; |
3e2e857f | 3195 | |
5fdc7db6 JY |
3196 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
3197 | info->index.vers = 0; /* Pretend no __versions section! */ | |
3198 | else | |
3199 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 3200 | |
49668688 | 3201 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 3202 | |
81a0abd9 | 3203 | return 0; |
3264d3f9 LT |
3204 | } |
3205 | ||
2f3238ae | 3206 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3207 | { |
49668688 | 3208 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3209 | int err; |
3210 | ||
2f3238ae RR |
3211 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3212 | modmagic = NULL; | |
3213 | ||
40dd2560 RR |
3214 | /* This is allowed: modprobe --force will invalidate it. */ |
3215 | if (!modmagic) { | |
3216 | err = try_to_force_load(mod, "bad vermagic"); | |
3217 | if (err) | |
3218 | return err; | |
49668688 | 3219 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3220 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3221 | info->name, modmagic, vermagic); |
40dd2560 RR |
3222 | return -ENOEXEC; |
3223 | } | |
3224 | ||
3205c36c LP |
3225 | if (!get_modinfo(info, "intree")) { |
3226 | if (!test_taint(TAINT_OOT_MODULE)) | |
3227 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3228 | mod->name); | |
373d4d09 | 3229 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3230 | } |
2449b8ba | 3231 | |
caf7501a AK |
3232 | check_modinfo_retpoline(mod, info); |
3233 | ||
49668688 | 3234 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3235 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3236 | pr_warn("%s: module is from the staging directory, the quality " |
3237 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3238 | } |
22e268eb | 3239 | |
2992ef29 | 3240 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3241 | if (err) |
3242 | return err; | |
3243 | ||
22e268eb | 3244 | /* Set up license info based on the info section */ |
49668688 | 3245 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3246 | |
40dd2560 RR |
3247 | return 0; |
3248 | } | |
3249 | ||
eb3057df | 3250 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3251 | { |
49668688 | 3252 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3253 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3254 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3255 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3256 | mod->crcs = section_addr(info, "__kcrctab"); |
3257 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3258 | sizeof(*mod->gpl_syms), |
3259 | &mod->num_gpl_syms); | |
49668688 | 3260 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
f91a13bb | 3261 | |
f91a13bb | 3262 | #ifdef CONFIG_CONSTRUCTORS |
49668688 | 3263 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3264 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3265 | if (!mod->ctors) |
3266 | mod->ctors = section_objs(info, ".init_array", | |
3267 | sizeof(*mod->ctors), &mod->num_ctors); | |
3268 | else if (find_sec(info, ".init_array")) { | |
3269 | /* | |
3270 | * This shouldn't happen with same compiler and binutils | |
3271 | * building all parts of the module. | |
3272 | */ | |
6da0b565 | 3273 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3274 | mod->name); |
3275 | return -EINVAL; | |
3276 | } | |
f91a13bb LT |
3277 | #endif |
3278 | ||
66e9b071 TG |
3279 | mod->noinstr_text_start = section_objs(info, ".noinstr.text", 1, |
3280 | &mod->noinstr_text_size); | |
3281 | ||
f91a13bb | 3282 | #ifdef CONFIG_TRACEPOINTS |
65498646 MD |
3283 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3284 | sizeof(*mod->tracepoints_ptrs), | |
3285 | &mod->num_tracepoints); | |
f91a13bb | 3286 | #endif |
fe15b50c PM |
3287 | #ifdef CONFIG_TREE_SRCU |
3288 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
3289 | sizeof(*mod->srcu_struct_ptrs), | |
3290 | &mod->num_srcu_structs); | |
3291 | #endif | |
a38d1107 MM |
3292 | #ifdef CONFIG_BPF_EVENTS |
3293 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
3294 | sizeof(*mod->bpf_raw_events), | |
3295 | &mod->num_bpf_raw_events); | |
3296 | #endif | |
36e68442 AN |
3297 | #ifdef CONFIG_DEBUG_INFO_BTF_MODULES |
3298 | mod->btf_data = any_section_objs(info, ".BTF", 1, &mod->btf_data_size); | |
3299 | #endif | |
e9666d10 | 3300 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
3301 | mod->jump_entries = section_objs(info, "__jump_table", |
3302 | sizeof(*mod->jump_entries), | |
3303 | &mod->num_jump_entries); | |
3304 | #endif | |
f91a13bb | 3305 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3306 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3307 | sizeof(*mod->trace_events), |
3308 | &mod->num_trace_events); | |
99be647c JL |
3309 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
3310 | sizeof(*mod->trace_evals), | |
3311 | &mod->num_trace_evals); | |
f91a13bb | 3312 | #endif |
13b9b6e7 SR |
3313 | #ifdef CONFIG_TRACING |
3314 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3315 | sizeof(*mod->trace_bprintk_fmt_start), | |
3316 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3317 | #endif |
f91a13bb LT |
3318 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3319 | /* sechdrs[0].sh_size is always zero */ | |
a1326b17 | 3320 | mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION, |
f91a13bb LT |
3321 | sizeof(*mod->ftrace_callsites), |
3322 | &mod->num_ftrace_callsites); | |
3323 | #endif | |
540adea3 MH |
3324 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
3325 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
3326 | sizeof(*mod->ei_funcs), | |
3327 | &mod->num_ei_funcs); | |
1e6769b0 MH |
3328 | #endif |
3329 | #ifdef CONFIG_KPROBES | |
3330 | mod->kprobes_text_start = section_objs(info, ".kprobes.text", 1, | |
3331 | &mod->kprobes_text_size); | |
16db6264 MH |
3332 | mod->kprobe_blacklist = section_objs(info, "_kprobe_blacklist", |
3333 | sizeof(unsigned long), | |
3334 | &mod->num_kprobe_blacklist); | |
9183c3f9 JP |
3335 | #endif |
3336 | #ifdef CONFIG_HAVE_STATIC_CALL_INLINE | |
3337 | mod->static_call_sites = section_objs(info, ".static_call_sites", | |
3338 | sizeof(*mod->static_call_sites), | |
3339 | &mod->num_static_call_sites); | |
92ace999 | 3340 | #endif |
811d66a0 RR |
3341 | mod->extable = section_objs(info, "__ex_table", |
3342 | sizeof(*mod->extable), &mod->num_exentries); | |
3343 | ||
49668688 | 3344 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3345 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 | 3346 | |
e5ebffe1 | 3347 | info->debug = section_objs(info, "__dyndbg", |
811d66a0 | 3348 | sizeof(*info->debug), &info->num_debug); |
eb3057df FH |
3349 | |
3350 | return 0; | |
f91a13bb LT |
3351 | } |
3352 | ||
49668688 | 3353 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3354 | { |
3355 | int i; | |
3356 | void *ptr; | |
3357 | ||
3358 | /* Do the allocs. */ | |
7523e4dc | 3359 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3360 | /* |
3361 | * The pointer to this block is stored in the module structure | |
3362 | * which is inside the block. Just mark it as not being a | |
3363 | * leak. | |
3364 | */ | |
3365 | kmemleak_not_leak(ptr); | |
3366 | if (!ptr) | |
d913188c | 3367 | return -ENOMEM; |
65b8a9b4 | 3368 | |
7523e4dc RR |
3369 | memset(ptr, 0, mod->core_layout.size); |
3370 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3371 | |
7523e4dc RR |
3372 | if (mod->init_layout.size) { |
3373 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3374 | /* |
3375 | * The pointer to this block is stored in the module structure | |
3376 | * which is inside the block. This block doesn't need to be | |
3377 | * scanned as it contains data and code that will be freed | |
3378 | * after the module is initialized. | |
3379 | */ | |
3380 | kmemleak_ignore(ptr); | |
3381 | if (!ptr) { | |
7523e4dc | 3382 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3383 | return -ENOMEM; |
3384 | } | |
7523e4dc RR |
3385 | memset(ptr, 0, mod->init_layout.size); |
3386 | mod->init_layout.base = ptr; | |
82fab442 | 3387 | } else |
7523e4dc | 3388 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3389 | |
3390 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3391 | pr_debug("final section addresses:\n"); |
49668688 | 3392 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3393 | void *dest; |
49668688 | 3394 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3395 | |
49668688 | 3396 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3397 | continue; |
3398 | ||
49668688 | 3399 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3400 | dest = mod->init_layout.base |
49668688 | 3401 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3402 | else |
7523e4dc | 3403 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3404 | |
49668688 RR |
3405 | if (shdr->sh_type != SHT_NOBITS) |
3406 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3407 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3408 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3409 | pr_debug("\t0x%lx %s\n", |
3410 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3411 | } |
d913188c RR |
3412 | |
3413 | return 0; | |
65b8a9b4 LT |
3414 | } |
3415 | ||
49668688 | 3416 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3417 | { |
3205c36c LP |
3418 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3419 | ||
22e268eb RR |
3420 | /* |
3421 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3422 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3423 | * using GPL-only symbols it needs. | |
3424 | */ | |
3425 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3426 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3427 | |
3428 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3429 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3430 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3431 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3432 | |
c99af375 MG |
3433 | /* lve claims to be GPL but upstream won't provide source */ |
3434 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3435 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3436 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3437 | |
3205c36c LP |
3438 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3439 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3440 | ||
22e268eb | 3441 | #ifdef CONFIG_MODVERSIONS |
36794822 CH |
3442 | if ((mod->num_syms && !mod->crcs) || |
3443 | (mod->num_gpl_syms && !mod->gpl_crcs)) { | |
22e268eb RR |
3444 | return try_to_force_load(mod, |
3445 | "no versions for exported symbols"); | |
3446 | } | |
3447 | #endif | |
3448 | return 0; | |
3449 | } | |
3450 | ||
3451 | static void flush_module_icache(const struct module *mod) | |
3452 | { | |
22e268eb RR |
3453 | /* |
3454 | * Flush the instruction cache, since we've played with text. | |
3455 | * Do it before processing of module parameters, so the module | |
3456 | * can provide parameter accessor functions of its own. | |
3457 | */ | |
7523e4dc RR |
3458 | if (mod->init_layout.base) |
3459 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3460 | (unsigned long)mod->init_layout.base | |
3461 | + mod->init_layout.size); | |
3462 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3463 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3464 | } |
3465 | ||
74e08fcf JB |
3466 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3467 | Elf_Shdr *sechdrs, | |
3468 | char *secstrings, | |
3469 | struct module *mod) | |
3470 | { | |
3471 | return 0; | |
3472 | } | |
3473 | ||
be7de5f9 PB |
3474 | /* module_blacklist is a comma-separated list of module names */ |
3475 | static char *module_blacklist; | |
96b5b194 | 3476 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
3477 | { |
3478 | const char *p; | |
3479 | size_t len; | |
3480 | ||
3481 | if (!module_blacklist) | |
3482 | return false; | |
3483 | ||
3484 | for (p = module_blacklist; *p; p += len) { | |
3485 | len = strcspn(p, ","); | |
3486 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3487 | return true; | |
3488 | if (p[len] == ',') | |
3489 | len++; | |
3490 | } | |
3491 | return false; | |
3492 | } | |
3493 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3494 | ||
2f3238ae | 3495 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3496 | { |
1da177e4 | 3497 | struct module *mod; |
444d13ff | 3498 | unsigned int ndx; |
d913188c | 3499 | int err; |
3ae91c21 | 3500 | |
81a0abd9 | 3501 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
3502 | if (err) |
3503 | return ERR_PTR(err); | |
1da177e4 | 3504 | |
1da177e4 | 3505 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 3506 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 3507 | info->secstrings, info->mod); |
1da177e4 | 3508 | if (err < 0) |
8d8022e8 | 3509 | return ERR_PTR(err); |
1da177e4 | 3510 | |
5c3a7db0 PZ |
3511 | err = module_enforce_rwx_sections(info->hdr, info->sechdrs, |
3512 | info->secstrings, info->mod); | |
3513 | if (err < 0) | |
3514 | return ERR_PTR(err); | |
3515 | ||
8d8022e8 RR |
3516 | /* We will do a special allocation for per-cpu sections later. */ |
3517 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3518 | |
444d13ff JY |
3519 | /* |
3520 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3521 | * layout_sections() can put it in the right place. | |
3522 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3523 | */ | |
3524 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
3525 | if (ndx) |
3526 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3527 | /* | |
3528 | * Mark the __jump_table section as ro_after_init as well: these data | |
3529 | * structures are never modified, with the exception of entries that | |
3530 | * refer to code in the __init section, which are annotated as such | |
3531 | * at module load time. | |
3532 | */ | |
3533 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
3534 | if (ndx) |
3535 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3536 | ||
24b9f0d2 SS |
3537 | /* |
3538 | * Determine total sizes, and put offsets in sh_entsize. For now | |
3539 | * this is done generically; there doesn't appear to be any | |
3540 | * special cases for the architectures. | |
3541 | */ | |
81a0abd9 JY |
3542 | layout_sections(info->mod, info); |
3543 | layout_symtab(info->mod, info); | |
1da177e4 | 3544 | |
65b8a9b4 | 3545 | /* Allocate and move to the final place */ |
81a0abd9 | 3546 | err = move_module(info->mod, info); |
d913188c | 3547 | if (err) |
8d8022e8 | 3548 | return ERR_PTR(err); |
d913188c RR |
3549 | |
3550 | /* Module has been copied to its final place now: return it. */ | |
3551 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3552 | kmemleak_load_module(mod, info); |
d913188c | 3553 | return mod; |
d913188c RR |
3554 | } |
3555 | ||
3556 | /* mod is no longer valid after this! */ | |
3557 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3558 | { | |
d913188c | 3559 | percpu_modfree(mod); |
d453cded | 3560 | module_arch_freeing_init(mod); |
7523e4dc RR |
3561 | module_memfree(mod->init_layout.base); |
3562 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3563 | } |
3564 | ||
74e08fcf JB |
3565 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3566 | const Elf_Shdr *sechdrs, | |
3567 | struct module *me) | |
3568 | { | |
3569 | return 0; | |
3570 | } | |
3571 | ||
811d66a0 RR |
3572 | static int post_relocation(struct module *mod, const struct load_info *info) |
3573 | { | |
51f3d0f4 | 3574 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3575 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3576 | ||
3577 | /* Copy relocated percpu area over. */ | |
3578 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3579 | info->sechdrs[info->index.pcpu].sh_size); | |
3580 | ||
51f3d0f4 | 3581 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3582 | add_kallsyms(mod, info); |
3583 | ||
3584 | /* Arch-specific module finalizing. */ | |
3585 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3586 | } | |
3587 | ||
9bb9c3be RR |
3588 | /* Is this module of this name done loading? No locks held. */ |
3589 | static bool finished_loading(const char *name) | |
3590 | { | |
3591 | struct module *mod; | |
3592 | bool ret; | |
3593 | ||
9cc019b8 PZ |
3594 | /* |
3595 | * The module_mutex should not be a heavily contended lock; | |
3596 | * if we get the occasional sleep here, we'll go an extra iteration | |
3597 | * in the wait_event_interruptible(), which is harmless. | |
3598 | */ | |
3599 | sched_annotate_sleep(); | |
9bb9c3be | 3600 | mutex_lock(&module_mutex); |
4f6de4d5 | 3601 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 3602 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
3603 | mutex_unlock(&module_mutex); |
3604 | ||
3605 | return ret; | |
3606 | } | |
3607 | ||
34e1169d KC |
3608 | /* Call module constructors. */ |
3609 | static void do_mod_ctors(struct module *mod) | |
3610 | { | |
3611 | #ifdef CONFIG_CONSTRUCTORS | |
3612 | unsigned long i; | |
3613 | ||
3614 | for (i = 0; i < mod->num_ctors; i++) | |
3615 | mod->ctors[i](); | |
3616 | #endif | |
3617 | } | |
3618 | ||
c7496379 RR |
3619 | /* For freeing module_init on success, in case kallsyms traversing */ |
3620 | struct mod_initfree { | |
1a7b7d92 | 3621 | struct llist_node node; |
c7496379 RR |
3622 | void *module_init; |
3623 | }; | |
3624 | ||
1a7b7d92 | 3625 | static void do_free_init(struct work_struct *w) |
c7496379 | 3626 | { |
1a7b7d92 RE |
3627 | struct llist_node *pos, *n, *list; |
3628 | struct mod_initfree *initfree; | |
3629 | ||
3630 | list = llist_del_all(&init_free_list); | |
3631 | ||
3632 | synchronize_rcu(); | |
3633 | ||
3634 | llist_for_each_safe(pos, n, list) { | |
3635 | initfree = container_of(pos, struct mod_initfree, node); | |
3636 | module_memfree(initfree->module_init); | |
3637 | kfree(initfree); | |
3638 | } | |
c7496379 RR |
3639 | } |
3640 | ||
be02a186 JK |
3641 | /* |
3642 | * This is where the real work happens. | |
3643 | * | |
3644 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3645 | * helper command 'lx-symbols'. | |
3646 | */ | |
3647 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3648 | { |
3649 | int ret = 0; | |
c7496379 RR |
3650 | struct mod_initfree *freeinit; |
3651 | ||
3652 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3653 | if (!freeinit) { | |
3654 | ret = -ENOMEM; | |
3655 | goto fail; | |
3656 | } | |
7523e4dc | 3657 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3658 | |
774a1221 TH |
3659 | /* |
3660 | * We want to find out whether @mod uses async during init. Clear | |
3661 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3662 | */ | |
3663 | current->flags &= ~PF_USED_ASYNC; | |
3664 | ||
34e1169d KC |
3665 | do_mod_ctors(mod); |
3666 | /* Start the module */ | |
3667 | if (mod->init != NULL) | |
3668 | ret = do_one_initcall(mod->init); | |
3669 | if (ret < 0) { | |
c7496379 | 3670 | goto fail_free_freeinit; |
34e1169d KC |
3671 | } |
3672 | if (ret > 0) { | |
bddb12b3 AM |
3673 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3674 | "follow 0/-E convention\n" | |
3675 | "%s: loading module anyway...\n", | |
3676 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3677 | dump_stack(); |
3678 | } | |
3679 | ||
3680 | /* Now it's a first class citizen! */ | |
3681 | mod->state = MODULE_STATE_LIVE; | |
3682 | blocking_notifier_call_chain(&module_notify_list, | |
3683 | MODULE_STATE_LIVE, mod); | |
3684 | ||
38dc717e JY |
3685 | /* Delay uevent until module has finished its init routine */ |
3686 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); | |
3687 | ||
774a1221 TH |
3688 | /* |
3689 | * We need to finish all async code before the module init sequence | |
3690 | * is done. This has potential to deadlock. For example, a newly | |
3691 | * detected block device can trigger request_module() of the | |
3692 | * default iosched from async probing task. Once userland helper | |
3693 | * reaches here, async_synchronize_full() will wait on the async | |
3694 | * task waiting on request_module() and deadlock. | |
3695 | * | |
3696 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3697 | * iff module init queued any async jobs. This isn't a full | |
3698 | * solution as it will deadlock the same if module loading from | |
3699 | * async jobs nests more than once; however, due to the various | |
3700 | * constraints, this hack seems to be the best option for now. | |
3701 | * Please refer to the following thread for details. | |
3702 | * | |
3703 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3704 | */ | |
f2411da7 | 3705 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3706 | async_synchronize_full(); |
34e1169d | 3707 | |
aba4b5c2 | 3708 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 3709 | mod->init_layout.size); |
34e1169d KC |
3710 | mutex_lock(&module_mutex); |
3711 | /* Drop initial reference. */ | |
3712 | module_put(mod); | |
3713 | trim_init_extable(mod); | |
3714 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3715 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3716 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3717 | #endif |
444d13ff | 3718 | module_enable_ro(mod, true); |
93c2e105 | 3719 | mod_tree_remove_init(mod); |
d453cded | 3720 | module_arch_freeing_init(mod); |
7523e4dc RR |
3721 | mod->init_layout.base = NULL; |
3722 | mod->init_layout.size = 0; | |
3723 | mod->init_layout.ro_size = 0; | |
444d13ff | 3724 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3725 | mod->init_layout.text_size = 0; |
607c543f AN |
3726 | #ifdef CONFIG_DEBUG_INFO_BTF_MODULES |
3727 | /* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */ | |
3728 | mod->btf_data = NULL; | |
607c543f | 3729 | #endif |
c7496379 RR |
3730 | /* |
3731 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 3732 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 3733 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
3734 | * path. module_memfree() cannot be called in an interrupt, so do the |
3735 | * work and call synchronize_rcu() in a work queue. | |
3736 | * | |
ae646f0b JH |
3737 | * Note that module_alloc() on most architectures creates W+X page |
3738 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
3739 | * code such as mark_rodata_ro() which depends on those mappings to | |
3740 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 3741 | * rcu_barrier() |
c7496379 | 3742 | */ |
1a7b7d92 RE |
3743 | if (llist_add(&freeinit->node, &init_free_list)) |
3744 | schedule_work(&init_free_wq); | |
3745 | ||
34e1169d KC |
3746 | mutex_unlock(&module_mutex); |
3747 | wake_up_all(&module_wq); | |
3748 | ||
3749 | return 0; | |
c7496379 RR |
3750 | |
3751 | fail_free_freeinit: | |
3752 | kfree(freeinit); | |
3753 | fail: | |
3754 | /* Try to protect us from buggy refcounters. */ | |
3755 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 3756 | synchronize_rcu(); |
c7496379 RR |
3757 | module_put(mod); |
3758 | blocking_notifier_call_chain(&module_notify_list, | |
3759 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3760 | klp_module_going(mod); |
7dcd182b | 3761 | ftrace_release_mod(mod); |
c7496379 RR |
3762 | free_module(mod); |
3763 | wake_up_all(&module_wq); | |
3764 | return ret; | |
34e1169d KC |
3765 | } |
3766 | ||
3767 | static int may_init_module(void) | |
3768 | { | |
3769 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3770 | return -EPERM; | |
3771 | ||
3772 | return 0; | |
3773 | } | |
3774 | ||
a3535c7e RR |
3775 | /* |
3776 | * We try to place it in the list now to make sure it's unique before | |
3777 | * we dedicate too many resources. In particular, temporary percpu | |
3778 | * memory exhaustion. | |
3779 | */ | |
3780 | static int add_unformed_module(struct module *mod) | |
3781 | { | |
3782 | int err; | |
3783 | struct module *old; | |
3784 | ||
3785 | mod->state = MODULE_STATE_UNFORMED; | |
3786 | ||
3787 | again: | |
3788 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3789 | old = find_module_all(mod->name, strlen(mod->name), true); |
3790 | if (old != NULL) { | |
6e6de3de | 3791 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
3792 | /* Wait in case it fails to load. */ |
3793 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3794 | err = wait_event_interruptible(module_wq, |
3795 | finished_loading(mod->name)); | |
a3535c7e RR |
3796 | if (err) |
3797 | goto out_unlocked; | |
3798 | goto again; | |
3799 | } | |
3800 | err = -EEXIST; | |
3801 | goto out; | |
3802 | } | |
4f666546 | 3803 | mod_update_bounds(mod); |
a3535c7e | 3804 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3805 | mod_tree_insert(mod); |
a3535c7e RR |
3806 | err = 0; |
3807 | ||
3808 | out: | |
3809 | mutex_unlock(&module_mutex); | |
3810 | out_unlocked: | |
3811 | return err; | |
3812 | } | |
3813 | ||
3814 | static int complete_formation(struct module *mod, struct load_info *info) | |
3815 | { | |
3816 | int err; | |
3817 | ||
3818 | mutex_lock(&module_mutex); | |
3819 | ||
3820 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 3821 | err = verify_exported_symbols(mod); |
a3535c7e RR |
3822 | if (err < 0) |
3823 | goto out; | |
3824 | ||
3825 | /* This relies on module_mutex for list integrity. */ | |
3826 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3827 | ||
444d13ff | 3828 | module_enable_ro(mod, false); |
85c898db | 3829 | module_enable_nx(mod); |
af742623 | 3830 | module_enable_x(mod); |
4982223e | 3831 | |
24b9f0d2 SS |
3832 | /* |
3833 | * Mark state as coming so strong_try_module_get() ignores us, | |
3834 | * but kallsyms etc. can see us. | |
3835 | */ | |
a3535c7e | 3836 | mod->state = MODULE_STATE_COMING; |
4982223e RR |
3837 | mutex_unlock(&module_mutex); |
3838 | ||
4982223e | 3839 | return 0; |
a3535c7e RR |
3840 | |
3841 | out: | |
3842 | mutex_unlock(&module_mutex); | |
3843 | return err; | |
3844 | } | |
3845 | ||
4c973d16 JY |
3846 | static int prepare_coming_module(struct module *mod) |
3847 | { | |
7e545d6e JY |
3848 | int err; |
3849 | ||
4c973d16 | 3850 | ftrace_module_enable(mod); |
7e545d6e JY |
3851 | err = klp_module_coming(mod); |
3852 | if (err) | |
3853 | return err; | |
3854 | ||
59cc8e0a PZ |
3855 | err = blocking_notifier_call_chain_robust(&module_notify_list, |
3856 | MODULE_STATE_COMING, MODULE_STATE_GOING, mod); | |
3857 | err = notifier_to_errno(err); | |
3858 | if (err) | |
3859 | klp_module_going(mod); | |
3860 | ||
3861 | return err; | |
4c973d16 JY |
3862 | } |
3863 | ||
ecc86170 LR |
3864 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3865 | void *arg) | |
54041d8a | 3866 | { |
f2411da7 LR |
3867 | struct module *mod = arg; |
3868 | int ret; | |
3869 | ||
3870 | if (strcmp(param, "async_probe") == 0) { | |
3871 | mod->async_probe_requested = true; | |
3872 | return 0; | |
3873 | } | |
3874 | ||
6da0b565 | 3875 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3876 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3877 | if (ret != 0) |
3878 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3879 | return 0; |
3880 | } | |
3881 | ||
cf68fffb ST |
3882 | static void cfi_init(struct module *mod); |
3883 | ||
24b9f0d2 SS |
3884 | /* |
3885 | * Allocate and load the module: note that size of section 0 is always | |
3886 | * zero, and we rely on this for optional sections. | |
3887 | */ | |
2f3238ae RR |
3888 | static int load_module(struct load_info *info, const char __user *uargs, |
3889 | int flags) | |
d913188c | 3890 | { |
a3535c7e | 3891 | struct module *mod; |
5fdc7db6 | 3892 | long err = 0; |
51e158c1 | 3893 | char *after_dashes; |
d913188c | 3894 | |
ec2a2959 FL |
3895 | /* |
3896 | * Do the signature check (if any) first. All that | |
3897 | * the signature check needs is info->len, it does | |
3898 | * not need any of the section info. That can be | |
3899 | * set up later. This will minimize the chances | |
3900 | * of a corrupt module causing problems before | |
3901 | * we even get to the signature check. | |
3902 | * | |
3903 | * The check will also adjust info->len by stripping | |
3904 | * off the sig length at the end of the module, making | |
3905 | * checks against info->len more correct. | |
3906 | */ | |
3907 | err = module_sig_check(info, flags); | |
3908 | if (err) | |
3909 | goto free_copy; | |
3910 | ||
3911 | /* | |
3912 | * Do basic sanity checks against the ELF header and | |
3913 | * sections. | |
3914 | */ | |
3915 | err = elf_validity_check(info); | |
14721add | 3916 | if (err) { |
ec2a2959 | 3917 | pr_err("Module has invalid ELF structures\n"); |
5fdc7db6 | 3918 | goto free_copy; |
14721add | 3919 | } |
5fdc7db6 | 3920 | |
ec2a2959 FL |
3921 | /* |
3922 | * Everything checks out, so set up the section info | |
3923 | * in the info structure. | |
3924 | */ | |
5fdc7db6 JY |
3925 | err = setup_load_info(info, flags); |
3926 | if (err) | |
3927 | goto free_copy; | |
3928 | ||
ec2a2959 FL |
3929 | /* |
3930 | * Now that we know we have the correct module name, check | |
3931 | * if it's blacklisted. | |
3932 | */ | |
5fdc7db6 JY |
3933 | if (blacklisted(info->name)) { |
3934 | err = -EPERM; | |
14721add | 3935 | pr_err("Module %s is blacklisted\n", info->name); |
5fdc7db6 JY |
3936 | goto free_copy; |
3937 | } | |
3938 | ||
5fdc7db6 | 3939 | err = rewrite_section_headers(info, flags); |
d913188c | 3940 | if (err) |
34e1169d | 3941 | goto free_copy; |
d913188c | 3942 | |
5fdc7db6 JY |
3943 | /* Check module struct version now, before we try to use module. */ |
3944 | if (!check_modstruct_version(info, info->mod)) { | |
3945 | err = -ENOEXEC; | |
3946 | goto free_copy; | |
3947 | } | |
3948 | ||
d913188c | 3949 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 3950 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3951 | if (IS_ERR(mod)) { |
3952 | err = PTR_ERR(mod); | |
d913188c | 3953 | goto free_copy; |
1da177e4 | 3954 | } |
1da177e4 | 3955 | |
ca86cad7 RGB |
3956 | audit_log_kern_module(mod->name); |
3957 | ||
a3535c7e RR |
3958 | /* Reserve our place in the list. */ |
3959 | err = add_unformed_module(mod); | |
3960 | if (err) | |
1fb9341a | 3961 | goto free_module; |
1fb9341a | 3962 | |
106a4ee2 | 3963 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3964 | mod->sig_ok = info->sig_ok; |
64748a2c | 3965 | if (!mod->sig_ok) { |
bddb12b3 | 3966 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3967 | "and/or required key missing - tainting " |
bddb12b3 | 3968 | "kernel\n", mod->name); |
66cc69e3 | 3969 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3970 | } |
106a4ee2 RR |
3971 | #endif |
3972 | ||
8d8022e8 | 3973 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3974 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3975 | if (err) |
3976 | goto unlink_mod; | |
3977 | ||
49668688 | 3978 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3979 | err = module_unload_init(mod); |
3980 | if (err) | |
1fb9341a | 3981 | goto unlink_mod; |
1da177e4 | 3982 | |
cf2fde7b | 3983 | init_param_lock(mod); |
b51d23e4 | 3984 | |
24b9f0d2 SS |
3985 | /* |
3986 | * Now we've got everything in the final locations, we can | |
3987 | * find optional sections. | |
3988 | */ | |
eb3057df FH |
3989 | err = find_module_sections(mod, info); |
3990 | if (err) | |
3991 | goto free_unload; | |
9b37ccfc | 3992 | |
49668688 | 3993 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3994 | if (err) |
3995 | goto free_unload; | |
9841d61d | 3996 | |
c988d2b2 | 3997 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3998 | setup_modinfo(mod, info); |
c988d2b2 | 3999 | |
1da177e4 | 4000 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 4001 | err = simplify_symbols(mod, info); |
1da177e4 | 4002 | if (err < 0) |
d913188c | 4003 | goto free_modinfo; |
1da177e4 | 4004 | |
34e1169d | 4005 | err = apply_relocations(mod, info); |
22e268eb | 4006 | if (err < 0) |
d913188c | 4007 | goto free_modinfo; |
1da177e4 | 4008 | |
34e1169d | 4009 | err = post_relocation(mod, info); |
1da177e4 | 4010 | if (err < 0) |
d913188c | 4011 | goto free_modinfo; |
1da177e4 | 4012 | |
22e268eb | 4013 | flush_module_icache(mod); |
378bac82 | 4014 | |
cf68fffb ST |
4015 | /* Setup CFI for the module. */ |
4016 | cfi_init(mod); | |
4017 | ||
6526c534 RR |
4018 | /* Now copy in args */ |
4019 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
4020 | if (IS_ERR(mod->args)) { | |
4021 | err = PTR_ERR(mod->args); | |
4022 | goto free_arch_cleanup; | |
4023 | } | |
8d3b33f6 | 4024 | |
52796312 | 4025 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 4026 | |
a949ae56 SRRH |
4027 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
4028 | ftrace_module_init(mod); | |
4029 | ||
a3535c7e RR |
4030 | /* Finally it's fully formed, ready to start executing. */ |
4031 | err = complete_formation(mod, info); | |
4032 | if (err) | |
1fb9341a | 4033 | goto ddebug_cleanup; |
be593f4c | 4034 | |
4c973d16 JY |
4035 | err = prepare_coming_module(mod); |
4036 | if (err) | |
4037 | goto bug_cleanup; | |
4038 | ||
51f3d0f4 | 4039 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 4040 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 4041 | -32768, 32767, mod, |
ecc86170 | 4042 | unknown_module_param_cb); |
51e158c1 RR |
4043 | if (IS_ERR(after_dashes)) { |
4044 | err = PTR_ERR(after_dashes); | |
4c973d16 | 4045 | goto coming_cleanup; |
51e158c1 RR |
4046 | } else if (after_dashes) { |
4047 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
4048 | mod->name, after_dashes); | |
4049 | } | |
1da177e4 | 4050 | |
ca86cad7 | 4051 | /* Link in to sysfs. */ |
34e1169d | 4052 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 4053 | if (err < 0) |
4c973d16 | 4054 | goto coming_cleanup; |
80a3d1bb | 4055 | |
1ce15ef4 JY |
4056 | if (is_livepatch_module(mod)) { |
4057 | err = copy_module_elf(mod, info); | |
4058 | if (err < 0) | |
4059 | goto sysfs_cleanup; | |
4060 | } | |
4061 | ||
48fd1188 | 4062 | /* Get rid of temporary copy. */ |
34e1169d | 4063 | free_copy(info); |
1da177e4 LT |
4064 | |
4065 | /* Done! */ | |
51f3d0f4 | 4066 | trace_module_load(mod); |
34e1169d KC |
4067 | |
4068 | return do_init_module(mod); | |
1da177e4 | 4069 | |
1ce15ef4 JY |
4070 | sysfs_cleanup: |
4071 | mod_sysfs_teardown(mod); | |
4c973d16 | 4072 | coming_cleanup: |
885a78d4 | 4073 | mod->state = MODULE_STATE_GOING; |
a5544880 | 4074 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
4075 | blocking_notifier_call_chain(&module_notify_list, |
4076 | MODULE_STATE_GOING, mod); | |
7e545d6e | 4077 | klp_module_going(mod); |
1fb9341a | 4078 | bug_cleanup: |
5e8ed280 | 4079 | mod->state = MODULE_STATE_GOING; |
1fb9341a | 4080 | /* module_bug_cleanup needs module_mutex protection */ |
75676500 | 4081 | mutex_lock(&module_mutex); |
5336377d | 4082 | module_bug_cleanup(mod); |
ee61abb3 | 4083 | mutex_unlock(&module_mutex); |
ff7e0055 | 4084 | |
a3535c7e | 4085 | ddebug_cleanup: |
1323eac7 | 4086 | ftrace_release_mod(mod); |
52796312 | 4087 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 4088 | synchronize_rcu(); |
6526c534 RR |
4089 | kfree(mod->args); |
4090 | free_arch_cleanup: | |
cf68fffb | 4091 | cfi_cleanup(mod); |
1da177e4 | 4092 | module_arch_cleanup(mod); |
d913188c | 4093 | free_modinfo: |
a263f776 | 4094 | free_modinfo(mod); |
22e268eb | 4095 | free_unload: |
1da177e4 | 4096 | module_unload_free(mod); |
1fb9341a RR |
4097 | unlink_mod: |
4098 | mutex_lock(&module_mutex); | |
4099 | /* Unlink carefully: kallsyms could be walking list. */ | |
4100 | list_del_rcu(&mod->list); | |
758556bd | 4101 | mod_tree_remove(mod); |
1fb9341a | 4102 | wake_up_all(&module_wq); |
0be964be | 4103 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 4104 | synchronize_rcu(); |
1fb9341a | 4105 | mutex_unlock(&module_mutex); |
d913188c | 4106 | free_module: |
35a9393c | 4107 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 4108 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 4109 | |
34e1169d | 4110 | module_deallocate(mod, info); |
d913188c | 4111 | free_copy: |
34e1169d KC |
4112 | free_copy(info); |
4113 | return err; | |
b99b87f7 PO |
4114 | } |
4115 | ||
17da2bd9 HC |
4116 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
4117 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 4118 | { |
34e1169d KC |
4119 | int err; |
4120 | struct load_info info = { }; | |
1da177e4 | 4121 | |
34e1169d KC |
4122 | err = may_init_module(); |
4123 | if (err) | |
4124 | return err; | |
1da177e4 | 4125 | |
34e1169d KC |
4126 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
4127 | umod, len, uargs); | |
1da177e4 | 4128 | |
34e1169d KC |
4129 | err = copy_module_from_user(umod, len, &info); |
4130 | if (err) | |
4131 | return err; | |
1da177e4 | 4132 | |
2f3238ae | 4133 | return load_module(&info, uargs, 0); |
34e1169d | 4134 | } |
94462ad3 | 4135 | |
2f3238ae | 4136 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 4137 | { |
34e1169d | 4138 | struct load_info info = { }; |
c307459b | 4139 | void *hdr = NULL; |
a1db7420 | 4140 | int err; |
94462ad3 | 4141 | |
34e1169d KC |
4142 | err = may_init_module(); |
4143 | if (err) | |
4144 | return err; | |
1da177e4 | 4145 | |
2f3238ae | 4146 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 4147 | |
2f3238ae RR |
4148 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
4149 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
4150 | return -EINVAL; | |
d6de2c80 | 4151 | |
0fa8e084 | 4152 | err = kernel_read_file_from_fd(fd, 0, &hdr, INT_MAX, NULL, |
a1db7420 | 4153 | READING_MODULE); |
f7a4f689 | 4154 | if (err < 0) |
34e1169d | 4155 | return err; |
a1db7420 | 4156 | info.hdr = hdr; |
f7a4f689 | 4157 | info.len = err; |
1da177e4 | 4158 | |
2f3238ae | 4159 | return load_module(&info, uargs, flags); |
1da177e4 LT |
4160 | } |
4161 | ||
4162 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
4163 | { | |
4164 | return ((void *)addr >= start && (void *)addr < start + size); | |
4165 | } | |
4166 | ||
4167 | #ifdef CONFIG_KALLSYMS | |
4168 | /* | |
4169 | * This ignores the intensely annoying "mapping symbols" found | |
4170 | * in ARM ELF files: $a, $t and $d. | |
4171 | */ | |
4172 | static inline int is_arm_mapping_symbol(const char *str) | |
4173 | { | |
2e3a10a1 RK |
4174 | if (str[0] == '.' && str[1] == 'L') |
4175 | return true; | |
6c34f1f5 | 4176 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
4177 | && (str[2] == '\0' || str[2] == '.'); |
4178 | } | |
4179 | ||
2d25bc55 | 4180 | static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 4181 | { |
8244062e | 4182 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
4183 | } |
4184 | ||
2d25bc55 JY |
4185 | /* |
4186 | * Given a module and address, find the corresponding symbol and return its name | |
4187 | * while providing its size and offset if needed. | |
4188 | */ | |
4189 | static const char *find_kallsyms_symbol(struct module *mod, | |
4190 | unsigned long addr, | |
4191 | unsigned long *size, | |
4192 | unsigned long *offset) | |
1da177e4 LT |
4193 | { |
4194 | unsigned int i, best = 0; | |
93d77e7f | 4195 | unsigned long nextval, bestval; |
8244062e | 4196 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
4197 | |
4198 | /* At worse, next value is at end of module */ | |
a06f6211 | 4199 | if (within_module_init(addr, mod)) |
7523e4dc | 4200 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 4201 | else |
7523e4dc | 4202 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 4203 | |
93d77e7f VW |
4204 | bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
4205 | ||
24b9f0d2 SS |
4206 | /* |
4207 | * Scan for closest preceding symbol, and next symbol. (ELF | |
4208 | * starts real symbols at 1). | |
4209 | */ | |
8244062e | 4210 | for (i = 1; i < kallsyms->num_symtab; i++) { |
93d77e7f VW |
4211 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
4212 | unsigned long thisval = kallsyms_symbol_value(sym); | |
4213 | ||
4214 | if (sym->st_shndx == SHN_UNDEF) | |
1da177e4 LT |
4215 | continue; |
4216 | ||
24b9f0d2 SS |
4217 | /* |
4218 | * We ignore unnamed symbols: they're uninformative | |
4219 | * and inserted at a whim. | |
4220 | */ | |
2d25bc55 JY |
4221 | if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
4222 | || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) | |
2e7bac53 RR |
4223 | continue; |
4224 | ||
93d77e7f | 4225 | if (thisval <= addr && thisval > bestval) { |
1da177e4 | 4226 | best = i; |
93d77e7f VW |
4227 | bestval = thisval; |
4228 | } | |
4229 | if (thisval > addr && thisval < nextval) | |
4230 | nextval = thisval; | |
1da177e4 LT |
4231 | } |
4232 | ||
4233 | if (!best) | |
4234 | return NULL; | |
4235 | ||
ffb45122 | 4236 | if (size) |
93d77e7f | 4237 | *size = nextval - bestval; |
ffb45122 | 4238 | if (offset) |
93d77e7f | 4239 | *offset = addr - bestval; |
2d25bc55 JY |
4240 | |
4241 | return kallsyms_symbol_name(kallsyms, best); | |
1da177e4 LT |
4242 | } |
4243 | ||
b865ea64 SS |
4244 | void * __weak dereference_module_function_descriptor(struct module *mod, |
4245 | void *ptr) | |
4246 | { | |
4247 | return ptr; | |
4248 | } | |
4249 | ||
24b9f0d2 SS |
4250 | /* |
4251 | * For kallsyms to ask for address resolution. NULL means not found. Careful | |
4252 | * not to lock to avoid deadlock on oopses, simply disable preemption. | |
4253 | */ | |
92dfc9dc | 4254 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
4255 | unsigned long *size, |
4256 | unsigned long *offset, | |
4257 | char **modname, | |
4258 | char *namebuf) | |
1da177e4 | 4259 | { |
cb2a5205 | 4260 | const char *ret = NULL; |
b7df4d1b | 4261 | struct module *mod; |
1da177e4 | 4262 | |
cb2a5205 | 4263 | preempt_disable(); |
b7df4d1b PZ |
4264 | mod = __module_address(addr); |
4265 | if (mod) { | |
4266 | if (modname) | |
4267 | *modname = mod->name; | |
2d25bc55 JY |
4268 | |
4269 | ret = find_kallsyms_symbol(mod, addr, size, offset); | |
1da177e4 | 4270 | } |
6dd06c9f RR |
4271 | /* Make a copy in here where it's safe */ |
4272 | if (ret) { | |
4273 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
4274 | ret = namebuf; | |
4275 | } | |
cb2a5205 | 4276 | preempt_enable(); |
b7df4d1b | 4277 | |
92dfc9dc | 4278 | return ret; |
1da177e4 LT |
4279 | } |
4280 | ||
9d65cb4a AD |
4281 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
4282 | { | |
4283 | struct module *mod; | |
4284 | ||
cb2a5205 | 4285 | preempt_disable(); |
d72b3751 | 4286 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4287 | if (mod->state == MODULE_STATE_UNFORMED) |
4288 | continue; | |
9b20a352 | 4289 | if (within_module(addr, mod)) { |
9d65cb4a AD |
4290 | const char *sym; |
4291 | ||
2d25bc55 | 4292 | sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
9d65cb4a AD |
4293 | if (!sym) |
4294 | goto out; | |
2d25bc55 | 4295 | |
9281acea | 4296 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 4297 | preempt_enable(); |
9d65cb4a AD |
4298 | return 0; |
4299 | } | |
4300 | } | |
4301 | out: | |
cb2a5205 | 4302 | preempt_enable(); |
9d65cb4a AD |
4303 | return -ERANGE; |
4304 | } | |
4305 | ||
a5c43dae AD |
4306 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
4307 | unsigned long *offset, char *modname, char *name) | |
4308 | { | |
4309 | struct module *mod; | |
4310 | ||
cb2a5205 | 4311 | preempt_disable(); |
d72b3751 | 4312 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
4313 | if (mod->state == MODULE_STATE_UNFORMED) |
4314 | continue; | |
9b20a352 | 4315 | if (within_module(addr, mod)) { |
a5c43dae AD |
4316 | const char *sym; |
4317 | ||
2d25bc55 | 4318 | sym = find_kallsyms_symbol(mod, addr, size, offset); |
a5c43dae AD |
4319 | if (!sym) |
4320 | goto out; | |
4321 | if (modname) | |
9281acea | 4322 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4323 | if (name) |
9281acea | 4324 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4325 | preempt_enable(); |
a5c43dae AD |
4326 | return 0; |
4327 | } | |
4328 | } | |
4329 | out: | |
cb2a5205 | 4330 | preempt_enable(); |
a5c43dae AD |
4331 | return -ERANGE; |
4332 | } | |
4333 | ||
ea07890a AD |
4334 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4335 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4336 | { |
4337 | struct module *mod; | |
4338 | ||
cb2a5205 | 4339 | preempt_disable(); |
d72b3751 | 4340 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4341 | struct mod_kallsyms *kallsyms; |
4342 | ||
0d21b0e3 RR |
4343 | if (mod->state == MODULE_STATE_UNFORMED) |
4344 | continue; | |
8244062e RR |
4345 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4346 | if (symnum < kallsyms->num_symtab) { | |
93d77e7f VW |
4347 | const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
4348 | ||
4349 | *value = kallsyms_symbol_value(sym); | |
1c7651f4 | 4350 | *type = kallsyms->typetab[symnum]; |
2d25bc55 | 4351 | strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
9281acea | 4352 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4353 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4354 | preempt_enable(); |
ea07890a | 4355 | return 0; |
1da177e4 | 4356 | } |
8244062e | 4357 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4358 | } |
cb2a5205 | 4359 | preempt_enable(); |
ea07890a | 4360 | return -ERANGE; |
1da177e4 LT |
4361 | } |
4362 | ||
2d25bc55 JY |
4363 | /* Given a module and name of symbol, find and return the symbol's value */ |
4364 | static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) | |
1da177e4 LT |
4365 | { |
4366 | unsigned int i; | |
8244062e | 4367 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4368 | |
93d77e7f VW |
4369 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4370 | const Elf_Sym *sym = &kallsyms->symtab[i]; | |
4371 | ||
2d25bc55 | 4372 | if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
93d77e7f VW |
4373 | sym->st_shndx != SHN_UNDEF) |
4374 | return kallsyms_symbol_value(sym); | |
4375 | } | |
1da177e4 LT |
4376 | return 0; |
4377 | } | |
4378 | ||
4379 | /* Look for this name: can be of form module:name. */ | |
4380 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4381 | { | |
4382 | struct module *mod; | |
4383 | char *colon; | |
4384 | unsigned long ret = 0; | |
4385 | ||
4386 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4387 | preempt_disable(); |
17586188 | 4388 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4389 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
2d25bc55 | 4390 | ret = find_kallsyms_symbol_value(mod, colon+1); |
1da177e4 | 4391 | } else { |
0d21b0e3 RR |
4392 | list_for_each_entry_rcu(mod, &modules, list) { |
4393 | if (mod->state == MODULE_STATE_UNFORMED) | |
4394 | continue; | |
2d25bc55 | 4395 | if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
1da177e4 | 4396 | break; |
0d21b0e3 | 4397 | } |
1da177e4 | 4398 | } |
cb2a5205 | 4399 | preempt_enable(); |
1da177e4 LT |
4400 | return ret; |
4401 | } | |
75a66614 | 4402 | |
3e355205 | 4403 | #ifdef CONFIG_LIVEPATCH |
75a66614 AK |
4404 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, |
4405 | struct module *, unsigned long), | |
4406 | void *data) | |
4407 | { | |
4408 | struct module *mod; | |
4409 | unsigned int i; | |
1e80d9cb | 4410 | int ret = 0; |
75a66614 | 4411 | |
013c1667 | 4412 | mutex_lock(&module_mutex); |
75a66614 | 4413 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4414 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4415 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4416 | ||
0d21b0e3 RR |
4417 | if (mod->state == MODULE_STATE_UNFORMED) |
4418 | continue; | |
8244062e | 4419 | for (i = 0; i < kallsyms->num_symtab; i++) { |
93d77e7f | 4420 | const Elf_Sym *sym = &kallsyms->symtab[i]; |
9f2d1e68 | 4421 | |
93d77e7f | 4422 | if (sym->st_shndx == SHN_UNDEF) |
9f2d1e68 JY |
4423 | continue; |
4424 | ||
2d25bc55 | 4425 | ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
93d77e7f | 4426 | mod, kallsyms_symbol_value(sym)); |
75a66614 | 4427 | if (ret != 0) |
013c1667 | 4428 | break; |
75a66614 AK |
4429 | } |
4430 | } | |
013c1667 CH |
4431 | mutex_unlock(&module_mutex); |
4432 | return ret; | |
75a66614 | 4433 | } |
3e355205 | 4434 | #endif /* CONFIG_LIVEPATCH */ |
1da177e4 LT |
4435 | #endif /* CONFIG_KALLSYMS */ |
4436 | ||
cf68fffb ST |
4437 | static void cfi_init(struct module *mod) |
4438 | { | |
4439 | #ifdef CONFIG_CFI_CLANG | |
4440 | initcall_t *init; | |
4441 | exitcall_t *exit; | |
4442 | ||
4443 | rcu_read_lock_sched(); | |
4444 | mod->cfi_check = (cfi_check_fn) | |
4445 | find_kallsyms_symbol_value(mod, "__cfi_check"); | |
4446 | init = (initcall_t *) | |
4447 | find_kallsyms_symbol_value(mod, "__cfi_jt_init_module"); | |
4448 | exit = (exitcall_t *) | |
4449 | find_kallsyms_symbol_value(mod, "__cfi_jt_cleanup_module"); | |
4450 | rcu_read_unlock_sched(); | |
4451 | ||
4452 | /* Fix init/exit functions to point to the CFI jump table */ | |
4453 | if (init) | |
4454 | mod->init = *init; | |
4455 | if (exit) | |
4456 | mod->exit = *exit; | |
4457 | ||
4458 | cfi_module_add(mod, module_addr_min); | |
4459 | #endif | |
4460 | } | |
4461 | ||
4462 | static void cfi_cleanup(struct module *mod) | |
4463 | { | |
4464 | #ifdef CONFIG_CFI_CLANG | |
4465 | cfi_module_remove(mod, module_addr_min); | |
4466 | #endif | |
4467 | } | |
4468 | ||
7fd8329b PM |
4469 | /* Maximum number of characters written by module_flags() */ |
4470 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4471 | ||
4472 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4473 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4474 | { |
4475 | int bx = 0; | |
4476 | ||
0d21b0e3 | 4477 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4478 | if (mod->taints || |
4479 | mod->state == MODULE_STATE_GOING || | |
4480 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4481 | buf[bx++] = '('; |
cca3e707 | 4482 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4483 | /* Show a - for module-is-being-unloaded */ |
4484 | if (mod->state == MODULE_STATE_GOING) | |
4485 | buf[bx++] = '-'; | |
4486 | /* Show a + for module-is-being-loaded */ | |
4487 | if (mod->state == MODULE_STATE_COMING) | |
4488 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4489 | buf[bx++] = ')'; |
4490 | } | |
4491 | buf[bx] = '\0'; | |
4492 | ||
4493 | return buf; | |
4494 | } | |
4495 | ||
3b5d5c6b AD |
4496 | #ifdef CONFIG_PROC_FS |
4497 | /* Called by the /proc file system to return a list of modules. */ | |
4498 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4499 | { | |
4500 | mutex_lock(&module_mutex); | |
4501 | return seq_list_start(&modules, *pos); | |
4502 | } | |
4503 | ||
4504 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4505 | { | |
4506 | return seq_list_next(p, &modules, pos); | |
4507 | } | |
4508 | ||
4509 | static void m_stop(struct seq_file *m, void *p) | |
4510 | { | |
4511 | mutex_unlock(&module_mutex); | |
4512 | } | |
4513 | ||
1da177e4 LT |
4514 | static int m_show(struct seq_file *m, void *p) |
4515 | { | |
4516 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4517 | char buf[MODULE_FLAGS_BUF_SIZE]; |
668533dc | 4518 | void *value; |
fa3ba2e8 | 4519 | |
0d21b0e3 RR |
4520 | /* We always ignore unformed modules. */ |
4521 | if (mod->state == MODULE_STATE_UNFORMED) | |
4522 | return 0; | |
4523 | ||
2f0f2a33 | 4524 | seq_printf(m, "%s %u", |
7523e4dc | 4525 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4526 | print_unload_info(m, mod); |
4527 | ||
4528 | /* Informative for users. */ | |
4529 | seq_printf(m, " %s", | |
6da0b565 IA |
4530 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4531 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4532 | "Live"); |
4533 | /* Used by oprofile and other similar tools. */ | |
668533dc LT |
4534 | value = m->private ? NULL : mod->core_layout.base; |
4535 | seq_printf(m, " 0x%px", value); | |
1da177e4 | 4536 | |
fa3ba2e8 FM |
4537 | /* Taints info */ |
4538 | if (mod->taints) | |
21aa9280 | 4539 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4540 | |
6da0b565 | 4541 | seq_puts(m, "\n"); |
1da177e4 LT |
4542 | return 0; |
4543 | } | |
4544 | ||
24b9f0d2 SS |
4545 | /* |
4546 | * Format: modulename size refcount deps address | |
4547 | * | |
4548 | * Where refcount is a number or -, and deps is a comma-separated list | |
4549 | * of depends or -. | |
4550 | */ | |
3b5d5c6b | 4551 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4552 | .start = m_start, |
4553 | .next = m_next, | |
4554 | .stop = m_stop, | |
4555 | .show = m_show | |
4556 | }; | |
4557 | ||
516fb7f2 LT |
4558 | /* |
4559 | * This also sets the "private" pointer to non-NULL if the | |
4560 | * kernel pointers should be hidden (so you can just test | |
4561 | * "m->private" to see if you should keep the values private). | |
4562 | * | |
4563 | * We use the same logic as for /proc/kallsyms. | |
4564 | */ | |
3b5d5c6b AD |
4565 | static int modules_open(struct inode *inode, struct file *file) |
4566 | { | |
516fb7f2 LT |
4567 | int err = seq_open(file, &modules_op); |
4568 | ||
4569 | if (!err) { | |
4570 | struct seq_file *m = file->private_data; | |
b25a7c5a | 4571 | m->private = kallsyms_show_value(file->f_cred) ? NULL : (void *)8ul; |
516fb7f2 LT |
4572 | } |
4573 | ||
3f553b30 | 4574 | return err; |
3b5d5c6b AD |
4575 | } |
4576 | ||
97a32539 | 4577 | static const struct proc_ops modules_proc_ops = { |
d919b33d | 4578 | .proc_flags = PROC_ENTRY_PERMANENT, |
97a32539 AD |
4579 | .proc_open = modules_open, |
4580 | .proc_read = seq_read, | |
4581 | .proc_lseek = seq_lseek, | |
4582 | .proc_release = seq_release, | |
3b5d5c6b AD |
4583 | }; |
4584 | ||
4585 | static int __init proc_modules_init(void) | |
4586 | { | |
97a32539 | 4587 | proc_create("modules", 0, NULL, &modules_proc_ops); |
3b5d5c6b AD |
4588 | return 0; |
4589 | } | |
4590 | module_init(proc_modules_init); | |
4591 | #endif | |
4592 | ||
1da177e4 LT |
4593 | /* Given an address, look for it in the module exception tables. */ |
4594 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4595 | { | |
1da177e4 LT |
4596 | const struct exception_table_entry *e = NULL; |
4597 | struct module *mod; | |
4598 | ||
24da1cbf | 4599 | preempt_disable(); |
5ff22646 PZ |
4600 | mod = __module_address(addr); |
4601 | if (!mod) | |
4602 | goto out; | |
22a8bdeb | 4603 | |
5ff22646 PZ |
4604 | if (!mod->num_exentries) |
4605 | goto out; | |
4606 | ||
4607 | e = search_extable(mod->extable, | |
a94c33dd | 4608 | mod->num_exentries, |
5ff22646 PZ |
4609 | addr); |
4610 | out: | |
24da1cbf | 4611 | preempt_enable(); |
1da177e4 | 4612 | |
5ff22646 PZ |
4613 | /* |
4614 | * Now, if we found one, we are running inside it now, hence | |
4615 | * we cannot unload the module, hence no refcnt needed. | |
4616 | */ | |
1da177e4 LT |
4617 | return e; |
4618 | } | |
4619 | ||
2541743e SS |
4620 | /** |
4621 | * is_module_address() - is this address inside a module? | |
e610499e RR |
4622 | * @addr: the address to check. |
4623 | * | |
4624 | * See is_module_text_address() if you simply want to see if the address | |
4625 | * is code (not data). | |
4d435f9d | 4626 | */ |
e610499e | 4627 | bool is_module_address(unsigned long addr) |
4d435f9d | 4628 | { |
e610499e | 4629 | bool ret; |
4d435f9d | 4630 | |
24da1cbf | 4631 | preempt_disable(); |
e610499e | 4632 | ret = __module_address(addr) != NULL; |
24da1cbf | 4633 | preempt_enable(); |
4d435f9d | 4634 | |
e610499e | 4635 | return ret; |
4d435f9d IM |
4636 | } |
4637 | ||
2541743e SS |
4638 | /** |
4639 | * __module_address() - get the module which contains an address. | |
e610499e RR |
4640 | * @addr: the address. |
4641 | * | |
4642 | * Must be called with preempt disabled or module mutex held so that | |
4643 | * module doesn't get freed during this. | |
4644 | */ | |
714f83d5 | 4645 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4646 | { |
4647 | struct module *mod; | |
4648 | ||
3a642e99 RR |
4649 | if (addr < module_addr_min || addr > module_addr_max) |
4650 | return NULL; | |
4651 | ||
0be964be PZ |
4652 | module_assert_mutex_or_preempt(); |
4653 | ||
6c9692e2 | 4654 | mod = mod_find(addr); |
93c2e105 PZ |
4655 | if (mod) { |
4656 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4657 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4658 | mod = NULL; |
0d21b0e3 | 4659 | } |
93c2e105 | 4660 | return mod; |
1da177e4 LT |
4661 | } |
4662 | ||
2541743e SS |
4663 | /** |
4664 | * is_module_text_address() - is this address inside module code? | |
e610499e RR |
4665 | * @addr: the address to check. |
4666 | * | |
4667 | * See is_module_address() if you simply want to see if the address is | |
4668 | * anywhere in a module. See kernel_text_address() for testing if an | |
4669 | * address corresponds to kernel or module code. | |
4670 | */ | |
4671 | bool is_module_text_address(unsigned long addr) | |
4672 | { | |
4673 | bool ret; | |
4674 | ||
4675 | preempt_disable(); | |
4676 | ret = __module_text_address(addr) != NULL; | |
4677 | preempt_enable(); | |
4678 | ||
4679 | return ret; | |
4680 | } | |
4681 | ||
2541743e SS |
4682 | /** |
4683 | * __module_text_address() - get the module whose code contains an address. | |
e610499e RR |
4684 | * @addr: the address. |
4685 | * | |
4686 | * Must be called with preempt disabled or module mutex held so that | |
4687 | * module doesn't get freed during this. | |
4688 | */ | |
4689 | struct module *__module_text_address(unsigned long addr) | |
4690 | { | |
4691 | struct module *mod = __module_address(addr); | |
4692 | if (mod) { | |
4693 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4694 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4695 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4696 | mod = NULL; |
4697 | } | |
4698 | return mod; | |
4699 | } | |
4700 | ||
1da177e4 LT |
4701 | /* Don't grab lock, we're oopsing. */ |
4702 | void print_modules(void) | |
4703 | { | |
4704 | struct module *mod; | |
7fd8329b | 4705 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4706 | |
b231125a | 4707 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4708 | /* Most callers should already have preempt disabled, but make sure */ |
4709 | preempt_disable(); | |
0d21b0e3 RR |
4710 | list_for_each_entry_rcu(mod, &modules, list) { |
4711 | if (mod->state == MODULE_STATE_UNFORMED) | |
4712 | continue; | |
27bba4d6 | 4713 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4714 | } |
d72b3751 | 4715 | preempt_enable(); |
e14af7ee | 4716 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4717 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4718 | pr_cont("\n"); | |
1da177e4 LT |
4719 | } |
4720 | ||
1da177e4 | 4721 | #ifdef CONFIG_MODVERSIONS |
24b9f0d2 SS |
4722 | /* |
4723 | * Generate the signature for all relevant module structures here. | |
4724 | * If these change, we don't want to try to parse the module. | |
4725 | */ | |
8c8ef42a RR |
4726 | void module_layout(struct module *mod, |
4727 | struct modversion_info *ver, | |
4728 | struct kernel_param *kp, | |
4729 | struct kernel_symbol *ks, | |
65498646 | 4730 | struct tracepoint * const *tp) |
8c8ef42a RR |
4731 | { |
4732 | } | |
4733 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4734 | #endif |