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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> |
9294523e | 16 | #include <linux/buildid.h> |
3b5d5c6b | 17 | #include <linux/fs.h> |
9f158333 | 18 | #include <linux/kernel.h> |
b89999d0 | 19 | #include <linux/kernel_read_file.h> |
1da177e4 LT |
20 | #include <linux/slab.h> |
21 | #include <linux/vmalloc.h> | |
22 | #include <linux/elf.h> | |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/syscalls.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/rcupdate.h> | |
c59ede7b | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/cpu.h> |
29 | #include <linux/moduleparam.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/err.h> | |
32 | #include <linux/vermagic.h> | |
33 | #include <linux/notifier.h> | |
f6a57033 | 34 | #include <linux/sched.h> |
1da177e4 | 35 | #include <linux/device.h> |
c988d2b2 | 36 | #include <linux/string.h> |
97d1f15b | 37 | #include <linux/mutex.h> |
d72b3751 | 38 | #include <linux/rculist.h> |
7c0f6ba6 | 39 | #include <linux/uaccess.h> |
1da177e4 | 40 | #include <asm/cacheflush.h> |
563ec5cb | 41 | #include <linux/set_memory.h> |
eb8cdec4 | 42 | #include <asm/mmu_context.h> |
b817f6fe | 43 | #include <linux/license.h> |
6d762394 | 44 | #include <asm/sections.h> |
97e1c18e | 45 | #include <linux/tracepoint.h> |
90d595fe | 46 | #include <linux/ftrace.h> |
7e545d6e | 47 | #include <linux/livepatch.h> |
22a9d645 | 48 | #include <linux/async.h> |
fbf59bc9 | 49 | #include <linux/percpu.h> |
4f2294b6 | 50 | #include <linux/kmemleak.h> |
bf5438fc | 51 | #include <linux/jump_label.h> |
84e1c6bb | 52 | #include <linux/pfn.h> |
403ed278 | 53 | #include <linux/bsearch.h> |
9d5059c9 | 54 | #include <linux/dynamic_debug.h> |
ca86cad7 | 55 | #include <linux/audit.h> |
2f3238ae | 56 | #include <uapi/linux/module.h> |
cfc1d277 | 57 | #include "internal.h" |
1da177e4 | 58 | |
7ead8b83 LZ |
59 | #define CREATE_TRACE_POINTS |
60 | #include <trace/events/module.h> | |
61 | ||
75676500 RR |
62 | /* |
63 | * Mutex protects: | |
64 | * 1) List of modules (also safely readable with preempt_disable), | |
65 | * 2) module_use links, | |
66 | * 3) module_addr_min/module_addr_max. | |
24b9f0d2 SS |
67 | * (delete and add uses RCU list operations). |
68 | */ | |
8ab4ed08 AT |
69 | DEFINE_MUTEX(module_mutex); |
70 | LIST_HEAD(modules); | |
67fc4e0c | 71 | |
1a7b7d92 | 72 | /* Work queue for freeing init sections in success case */ |
fdf09ab8 DJ |
73 | static void do_free_init(struct work_struct *w); |
74 | static DECLARE_WORK(init_free_wq, do_free_init); | |
75 | static LLIST_HEAD(init_free_list); | |
1a7b7d92 | 76 | |
6c9692e2 | 77 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
58d208de | 78 | struct mod_tree_root mod_tree __cacheline_aligned = { |
4f666546 | 79 | .addr_min = -1UL, |
106a4ee2 | 80 | }; |
106a4ee2 | 81 | |
4f666546 PZ |
82 | #define module_addr_min mod_tree.addr_min |
83 | #define module_addr_max mod_tree.addr_max | |
84 | ||
58d208de AT |
85 | #else /* !CONFIG_MODULES_TREE_LOOKUP */ |
86 | static unsigned long module_addr_min = -1UL, module_addr_max; | |
87 | #endif /* CONFIG_MODULES_TREE_LOOKUP */ | |
6c9692e2 | 88 | |
47889798 AT |
89 | struct symsearch { |
90 | const struct kernel_symbol *start, *stop; | |
91 | const s32 *crcs; | |
92 | enum mod_license license; | |
93 | }; | |
94 | ||
4f666546 PZ |
95 | /* |
96 | * Bounds of module text, for speeding up __module_address. | |
97 | * Protected by module_mutex. | |
98 | */ | |
99 | static void __mod_update_bounds(void *base, unsigned int size) | |
100 | { | |
101 | unsigned long min = (unsigned long)base; | |
102 | unsigned long max = min + size; | |
103 | ||
104 | if (min < module_addr_min) | |
105 | module_addr_min = min; | |
106 | if (max > module_addr_max) | |
107 | module_addr_max = max; | |
108 | } | |
109 | ||
110 | static void mod_update_bounds(struct module *mod) | |
111 | { | |
7523e4dc RR |
112 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
113 | if (mod->init_layout.size) | |
114 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
115 | } |
116 | ||
0be964be PZ |
117 | static void module_assert_mutex_or_preempt(void) |
118 | { | |
119 | #ifdef CONFIG_LOCKDEP | |
120 | if (unlikely(!debug_locks)) | |
121 | return; | |
122 | ||
9502514f | 123 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
124 | !lockdep_is_held(&module_mutex)); |
125 | #endif | |
126 | } | |
127 | ||
19e4529e SR |
128 | /* Block module loading/unloading? */ |
129 | int modules_disabled = 0; | |
02608bef | 130 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 131 | |
c9a3ba55 RR |
132 | /* Waiting for a module to finish initializing? */ |
133 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
134 | ||
e041c683 | 135 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 136 | |
6da0b565 | 137 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 138 | { |
e041c683 | 139 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
140 | } |
141 | EXPORT_SYMBOL(register_module_notifier); | |
142 | ||
6da0b565 | 143 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 144 | { |
e041c683 | 145 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
146 | } |
147 | EXPORT_SYMBOL(unregister_module_notifier); | |
148 | ||
71d9f507 MB |
149 | /* |
150 | * We require a truly strong try_module_get(): 0 means success. | |
151 | * Otherwise an error is returned due to ongoing or failed | |
152 | * initialization etc. | |
153 | */ | |
1da177e4 LT |
154 | static inline int strong_try_module_get(struct module *mod) |
155 | { | |
0d21b0e3 | 156 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 157 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
158 | return -EBUSY; |
159 | if (try_module_get(mod)) | |
1da177e4 | 160 | return 0; |
c9a3ba55 RR |
161 | else |
162 | return -ENOENT; | |
1da177e4 LT |
163 | } |
164 | ||
373d4d09 RR |
165 | static inline void add_taint_module(struct module *mod, unsigned flag, |
166 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 167 | { |
373d4d09 | 168 | add_taint(flag, lockdep_ok); |
7fd8329b | 169 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
170 | } |
171 | ||
02a3e59a RD |
172 | /* |
173 | * A thread that wants to hold a reference to a module only while it | |
f49169c9 | 174 | * is running can call this to safely exit. |
1da177e4 | 175 | */ |
ca3574bd | 176 | void __noreturn __module_put_and_kthread_exit(struct module *mod, long code) |
1da177e4 LT |
177 | { |
178 | module_put(mod); | |
ca3574bd | 179 | kthread_exit(code); |
1da177e4 | 180 | } |
ca3574bd | 181 | EXPORT_SYMBOL(__module_put_and_kthread_exit); |
22a8bdeb | 182 | |
1da177e4 | 183 | /* Find a module section: 0 means not found. */ |
49668688 | 184 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
185 | { |
186 | unsigned int i; | |
187 | ||
49668688 RR |
188 | for (i = 1; i < info->hdr->e_shnum; i++) { |
189 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 190 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
191 | if ((shdr->sh_flags & SHF_ALLOC) |
192 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 193 | return i; |
49668688 | 194 | } |
1da177e4 LT |
195 | return 0; |
196 | } | |
197 | ||
5e458cc0 | 198 | /* Find a module section, or NULL. */ |
49668688 | 199 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
200 | { |
201 | /* Section 0 has sh_addr 0. */ | |
49668688 | 202 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
203 | } |
204 | ||
205 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 206 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
207 | const char *name, |
208 | size_t object_size, | |
209 | unsigned int *num) | |
210 | { | |
49668688 | 211 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
212 | |
213 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
214 | *num = info->sechdrs[sec].sh_size / object_size; |
215 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
216 | } |
217 | ||
36e68442 AN |
218 | /* Find a module section: 0 means not found. Ignores SHF_ALLOC flag. */ |
219 | static unsigned int find_any_sec(const struct load_info *info, const char *name) | |
220 | { | |
221 | unsigned int i; | |
222 | ||
223 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
224 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
225 | if (strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
226 | return i; | |
227 | } | |
228 | return 0; | |
229 | } | |
230 | ||
231 | /* | |
232 | * Find a module section, or NULL. Fill in number of "objects" in section. | |
233 | * Ignores SHF_ALLOC flag. | |
234 | */ | |
235 | static __maybe_unused void *any_section_objs(const struct load_info *info, | |
236 | const char *name, | |
237 | size_t object_size, | |
238 | unsigned int *num) | |
239 | { | |
240 | unsigned int sec = find_any_sec(info, name); | |
241 | ||
242 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
243 | *num = info->sechdrs[sec].sh_size / object_size; | |
244 | return (void *)info->sechdrs[sec].sh_addr; | |
245 | } | |
246 | ||
1da177e4 LT |
247 | #ifndef CONFIG_MODVERSIONS |
248 | #define symversion(base, idx) NULL | |
249 | #else | |
f83ca9fe | 250 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
251 | #endif |
252 | ||
2d25bc55 JY |
253 | static bool check_exported_symbol(const struct symsearch *syms, |
254 | struct module *owner, | |
255 | unsigned int symnum, void *data) | |
dafd0940 RR |
256 | { |
257 | struct find_symbol_arg *fsa = data; | |
258 | ||
f1c3d73e CH |
259 | if (!fsa->gplok && syms->license == GPL_ONLY) |
260 | return false; | |
dafd0940 RR |
261 | fsa->owner = owner; |
262 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 263 | fsa->sym = &syms->start[symnum]; |
ef1dac60 | 264 | fsa->license = syms->license; |
dafd0940 RR |
265 | return true; |
266 | } | |
267 | ||
7290d580 AB |
268 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) |
269 | { | |
270 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
271 | return offset_to_ptr(&sym->name_offset); | |
272 | #else | |
273 | return sym->name; | |
274 | #endif | |
275 | } | |
276 | ||
8651ec01 MM |
277 | static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
278 | { | |
279 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
069e1c07 WD |
280 | if (!sym->namespace_offset) |
281 | return NULL; | |
8651ec01 MM |
282 | return offset_to_ptr(&sym->namespace_offset); |
283 | #else | |
284 | return sym->namespace; | |
285 | #endif | |
286 | } | |
287 | ||
91fb02f3 | 288 | int cmp_name(const void *name, const void *sym) |
403ed278 | 289 | { |
b605be65 | 290 | return strcmp(name, kernel_symbol_name(sym)); |
403ed278 AIB |
291 | } |
292 | ||
2d25bc55 JY |
293 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
294 | struct module *owner, | |
295 | void *data) | |
de4d8d53 RR |
296 | { |
297 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
298 | struct kernel_symbol *sym; |
299 | ||
300 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
301 | sizeof(struct kernel_symbol), cmp_name); | |
302 | ||
2d25bc55 JY |
303 | if (sym != NULL && check_exported_symbol(syms, owner, |
304 | sym - syms->start, data)) | |
403ed278 | 305 | return true; |
de4d8d53 | 306 | |
de4d8d53 RR |
307 | return false; |
308 | } | |
309 | ||
24b9f0d2 SS |
310 | /* |
311 | * Find an exported symbol and return it, along with, (optional) crc and | |
312 | * (optional) module which owns it. Needs preempt disabled or module_mutex. | |
313 | */ | |
47889798 | 314 | bool find_symbol(struct find_symbol_arg *fsa) |
dafd0940 | 315 | { |
71e4b309 CH |
316 | static const struct symsearch arr[] = { |
317 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, | |
36794822 | 318 | NOT_GPL_ONLY }, |
71e4b309 CH |
319 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
320 | __start___kcrctab_gpl, | |
36794822 | 321 | GPL_ONLY }, |
71e4b309 | 322 | }; |
71e4b309 CH |
323 | struct module *mod; |
324 | unsigned int i; | |
dafd0940 | 325 | |
71e4b309 | 326 | module_assert_mutex_or_preempt(); |
dafd0940 | 327 | |
71e4b309 | 328 | for (i = 0; i < ARRAY_SIZE(arr); i++) |
0b96615c CH |
329 | if (find_exported_symbol_in_section(&arr[i], NULL, fsa)) |
330 | return true; | |
71e4b309 CH |
331 | |
332 | list_for_each_entry_rcu(mod, &modules, list, | |
333 | lockdep_is_held(&module_mutex)) { | |
334 | struct symsearch arr[] = { | |
335 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
36794822 | 336 | NOT_GPL_ONLY }, |
71e4b309 CH |
337 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
338 | mod->gpl_crcs, | |
36794822 | 339 | GPL_ONLY }, |
71e4b309 CH |
340 | }; |
341 | ||
342 | if (mod->state == MODULE_STATE_UNFORMED) | |
343 | continue; | |
344 | ||
345 | for (i = 0; i < ARRAY_SIZE(arr); i++) | |
0b96615c CH |
346 | if (find_exported_symbol_in_section(&arr[i], mod, fsa)) |
347 | return true; | |
dafd0940 RR |
348 | } |
349 | ||
0b96615c CH |
350 | pr_debug("Failed to find symbol %s\n", fsa->name); |
351 | return false; | |
1da177e4 LT |
352 | } |
353 | ||
fe0d34d2 RR |
354 | /* |
355 | * Search for module by name: must hold module_mutex (or preempt disabled | |
356 | * for read-only access). | |
357 | */ | |
91fb02f3 AT |
358 | struct module *find_module_all(const char *name, size_t len, |
359 | bool even_unformed) | |
1da177e4 LT |
360 | { |
361 | struct module *mod; | |
362 | ||
fe0d34d2 | 363 | module_assert_mutex_or_preempt(); |
0be964be | 364 | |
bf08949c MH |
365 | list_for_each_entry_rcu(mod, &modules, list, |
366 | lockdep_is_held(&module_mutex)) { | |
0d21b0e3 RR |
367 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
368 | continue; | |
4f6de4d5 | 369 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
370 | return mod; |
371 | } | |
372 | return NULL; | |
373 | } | |
0d21b0e3 RR |
374 | |
375 | struct module *find_module(const char *name) | |
376 | { | |
4f6de4d5 | 377 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 378 | } |
1da177e4 LT |
379 | |
380 | #ifdef CONFIG_SMP | |
fbf59bc9 | 381 | |
259354de | 382 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 383 | { |
259354de TH |
384 | return mod->percpu; |
385 | } | |
fbf59bc9 | 386 | |
9eb76d77 | 387 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 388 | { |
9eb76d77 RR |
389 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
390 | unsigned long align = pcpusec->sh_addralign; | |
391 | ||
392 | if (!pcpusec->sh_size) | |
393 | return 0; | |
394 | ||
fbf59bc9 | 395 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
396 | pr_warn("%s: per-cpu alignment %li > %li\n", |
397 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
398 | align = PAGE_SIZE; |
399 | } | |
400 | ||
9eb76d77 | 401 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 402 | if (!mod->percpu) { |
bddb12b3 AM |
403 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
404 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
405 | return -ENOMEM; |
406 | } | |
9eb76d77 | 407 | mod->percpu_size = pcpusec->sh_size; |
259354de | 408 | return 0; |
fbf59bc9 TH |
409 | } |
410 | ||
259354de | 411 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 412 | { |
259354de | 413 | free_percpu(mod->percpu); |
fbf59bc9 TH |
414 | } |
415 | ||
49668688 | 416 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 417 | { |
49668688 | 418 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
419 | } |
420 | ||
259354de TH |
421 | static void percpu_modcopy(struct module *mod, |
422 | const void *from, unsigned long size) | |
6b588c18 TH |
423 | { |
424 | int cpu; | |
425 | ||
426 | for_each_possible_cpu(cpu) | |
259354de | 427 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
428 | } |
429 | ||
383776fa | 430 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
431 | { |
432 | struct module *mod; | |
433 | unsigned int cpu; | |
434 | ||
435 | preempt_disable(); | |
436 | ||
437 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
438 | if (mod->state == MODULE_STATE_UNFORMED) |
439 | continue; | |
10fad5e4 TH |
440 | if (!mod->percpu_size) |
441 | continue; | |
442 | for_each_possible_cpu(cpu) { | |
443 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 444 | void *va = (void *)addr; |
10fad5e4 | 445 | |
383776fa | 446 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 447 | if (can_addr) { |
383776fa | 448 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
449 | *can_addr += (unsigned long) |
450 | per_cpu_ptr(mod->percpu, | |
451 | get_boot_cpu_id()); | |
452 | } | |
10fad5e4 TH |
453 | preempt_enable(); |
454 | return true; | |
455 | } | |
456 | } | |
457 | } | |
458 | ||
459 | preempt_enable(); | |
460 | return false; | |
6b588c18 TH |
461 | } |
462 | ||
383776fa | 463 | /** |
24389b61 | 464 | * is_module_percpu_address() - test whether address is from module static percpu |
383776fa TG |
465 | * @addr: address to test |
466 | * | |
467 | * Test whether @addr belongs to module static percpu area. | |
468 | * | |
24389b61 | 469 | * Return: %true if @addr is from module static percpu area |
383776fa TG |
470 | */ |
471 | bool is_module_percpu_address(unsigned long addr) | |
472 | { | |
473 | return __is_module_percpu_address(addr, NULL); | |
474 | } | |
475 | ||
1da177e4 | 476 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 477 | |
259354de | 478 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
479 | { |
480 | return NULL; | |
481 | } | |
9eb76d77 | 482 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 483 | { |
9eb76d77 RR |
484 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
485 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
486 | return -ENOMEM; | |
487 | return 0; | |
259354de TH |
488 | } |
489 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 490 | { |
1da177e4 | 491 | } |
49668688 | 492 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
493 | { |
494 | return 0; | |
495 | } | |
259354de TH |
496 | static inline void percpu_modcopy(struct module *mod, |
497 | const void *from, unsigned long size) | |
1da177e4 LT |
498 | { |
499 | /* pcpusec should be 0, and size of that section should be 0. */ | |
500 | BUG_ON(size != 0); | |
501 | } | |
10fad5e4 TH |
502 | bool is_module_percpu_address(unsigned long addr) |
503 | { | |
504 | return false; | |
505 | } | |
6b588c18 | 506 | |
383776fa TG |
507 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
508 | { | |
509 | return false; | |
510 | } | |
511 | ||
1da177e4 LT |
512 | #endif /* CONFIG_SMP */ |
513 | ||
c988d2b2 MD |
514 | #define MODINFO_ATTR(field) \ |
515 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
516 | { \ | |
517 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
518 | } \ | |
519 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 520 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 521 | { \ |
cc56ded3 | 522 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
523 | } \ |
524 | static int modinfo_##field##_exists(struct module *mod) \ | |
525 | { \ | |
526 | return mod->field != NULL; \ | |
527 | } \ | |
528 | static void free_modinfo_##field(struct module *mod) \ | |
529 | { \ | |
22a8bdeb DW |
530 | kfree(mod->field); \ |
531 | mod->field = NULL; \ | |
c988d2b2 MD |
532 | } \ |
533 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 534 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
535 | .show = show_modinfo_##field, \ |
536 | .setup = setup_modinfo_##field, \ | |
537 | .test = modinfo_##field##_exists, \ | |
538 | .free = free_modinfo_##field, \ | |
539 | }; | |
540 | ||
541 | MODINFO_ATTR(version); | |
542 | MODINFO_ATTR(srcversion); | |
543 | ||
e14af7ee AV |
544 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
545 | ||
03e88ae1 | 546 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
547 | |
548 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
549 | ||
e513cc1c MH |
550 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
551 | #define MODULE_REF_BASE 1 | |
552 | ||
1da177e4 | 553 | /* Init the unload section of the module. */ |
9f85a4bb | 554 | static int module_unload_init(struct module *mod) |
1da177e4 | 555 | { |
e513cc1c MH |
556 | /* |
557 | * Initialize reference counter to MODULE_REF_BASE. | |
558 | * refcnt == 0 means module is going. | |
559 | */ | |
560 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 561 | |
2c02dfe7 LT |
562 | INIT_LIST_HEAD(&mod->source_list); |
563 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 564 | |
1da177e4 | 565 | /* Hold reference count during initialization. */ |
e513cc1c | 566 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
567 | |
568 | return 0; | |
1da177e4 LT |
569 | } |
570 | ||
1da177e4 LT |
571 | /* Does a already use b? */ |
572 | static int already_uses(struct module *a, struct module *b) | |
573 | { | |
574 | struct module_use *use; | |
575 | ||
2c02dfe7 LT |
576 | list_for_each_entry(use, &b->source_list, source_list) { |
577 | if (use->source == a) { | |
5e124169 | 578 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
579 | return 1; |
580 | } | |
581 | } | |
5e124169 | 582 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
583 | return 0; |
584 | } | |
585 | ||
2c02dfe7 LT |
586 | /* |
587 | * Module a uses b | |
588 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
589 | * - the module_use is added to the list of 'b' sources (so | |
590 | * 'b' can walk the list to see who sourced them), and of 'a' | |
591 | * targets (so 'a' can see what modules it targets). | |
592 | */ | |
593 | static int add_module_usage(struct module *a, struct module *b) | |
594 | { | |
2c02dfe7 LT |
595 | struct module_use *use; |
596 | ||
5e124169 | 597 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 598 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 599 | if (!use) |
2c02dfe7 | 600 | return -ENOMEM; |
2c02dfe7 LT |
601 | |
602 | use->source = a; | |
603 | use->target = b; | |
604 | list_add(&use->source_list, &b->source_list); | |
605 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
606 | return 0; |
607 | } | |
608 | ||
75676500 | 609 | /* Module a uses b: caller needs module_mutex() */ |
7ef5264d | 610 | static int ref_module(struct module *a, struct module *b) |
1da177e4 | 611 | { |
c8e21ced | 612 | int err; |
270a6c4c | 613 | |
9bea7f23 | 614 | if (b == NULL || already_uses(a, b)) |
218ce735 | 615 | return 0; |
218ce735 | 616 | |
9bea7f23 RR |
617 | /* If module isn't available, we fail. */ |
618 | err = strong_try_module_get(b); | |
c9a3ba55 | 619 | if (err) |
9bea7f23 | 620 | return err; |
1da177e4 | 621 | |
2c02dfe7 LT |
622 | err = add_module_usage(a, b); |
623 | if (err) { | |
1da177e4 | 624 | module_put(b); |
9bea7f23 | 625 | return err; |
1da177e4 | 626 | } |
9bea7f23 | 627 | return 0; |
1da177e4 LT |
628 | } |
629 | ||
630 | /* Clear the unload stuff of the module. */ | |
631 | static void module_unload_free(struct module *mod) | |
632 | { | |
2c02dfe7 | 633 | struct module_use *use, *tmp; |
1da177e4 | 634 | |
75676500 | 635 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
636 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
637 | struct module *i = use->target; | |
5e124169 | 638 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
639 | module_put(i); |
640 | list_del(&use->source_list); | |
641 | list_del(&use->target_list); | |
642 | kfree(use); | |
1da177e4 | 643 | } |
75676500 | 644 | mutex_unlock(&module_mutex); |
1da177e4 LT |
645 | } |
646 | ||
647 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 648 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
649 | { |
650 | int ret = (flags & O_TRUNC); | |
651 | if (ret) | |
373d4d09 | 652 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
653 | return ret; |
654 | } | |
655 | #else | |
fb169793 | 656 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
657 | { |
658 | return 0; | |
659 | } | |
660 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
661 | ||
e513cc1c MH |
662 | /* Try to release refcount of module, 0 means success. */ |
663 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 664 | { |
e513cc1c | 665 | int ret; |
1da177e4 | 666 | |
e513cc1c MH |
667 | /* Try to decrement refcnt which we set at loading */ |
668 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
669 | BUG_ON(ret < 0); | |
670 | if (ret) | |
671 | /* Someone can put this right now, recover with checking */ | |
672 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 673 | |
e513cc1c MH |
674 | return ret; |
675 | } | |
1da177e4 | 676 | |
e513cc1c MH |
677 | static int try_stop_module(struct module *mod, int flags, int *forced) |
678 | { | |
da39ba5e | 679 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
680 | if (try_release_module_ref(mod) != 0) { |
681 | *forced = try_force_unload(flags); | |
682 | if (!(*forced)) | |
1da177e4 LT |
683 | return -EWOULDBLOCK; |
684 | } | |
685 | ||
686 | /* Mark it as dying. */ | |
e513cc1c | 687 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 688 | |
e513cc1c | 689 | return 0; |
1da177e4 LT |
690 | } |
691 | ||
d5db139a | 692 | /** |
24389b61 | 693 | * module_refcount() - return the refcount or -1 if unloading |
d5db139a RR |
694 | * @mod: the module we're checking |
695 | * | |
24389b61 | 696 | * Return: |
d5db139a RR |
697 | * -1 if the module is in the process of unloading |
698 | * otherwise the number of references in the kernel to the module | |
699 | */ | |
700 | int module_refcount(struct module *mod) | |
1da177e4 | 701 | { |
d5db139a | 702 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
703 | } |
704 | EXPORT_SYMBOL(module_refcount); | |
705 | ||
706 | /* This exists whether we can unload or not */ | |
707 | static void free_module(struct module *mod); | |
708 | ||
17da2bd9 HC |
709 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
710 | unsigned int, flags) | |
1da177e4 LT |
711 | { |
712 | struct module *mod; | |
dfff0a06 | 713 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
714 | int ret, forced = 0; |
715 | ||
3d43321b | 716 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
717 | return -EPERM; |
718 | ||
719 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
720 | return -EFAULT; | |
721 | name[MODULE_NAME_LEN-1] = '\0'; | |
722 | ||
f6276ac9 RGB |
723 | audit_log_kern_module(name); |
724 | ||
3fc1f1e2 TH |
725 | if (mutex_lock_interruptible(&module_mutex) != 0) |
726 | return -EINTR; | |
1da177e4 LT |
727 | |
728 | mod = find_module(name); | |
729 | if (!mod) { | |
730 | ret = -ENOENT; | |
731 | goto out; | |
732 | } | |
733 | ||
2c02dfe7 | 734 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
735 | /* Other modules depend on us: get rid of them first. */ |
736 | ret = -EWOULDBLOCK; | |
737 | goto out; | |
738 | } | |
739 | ||
740 | /* Doing init or already dying? */ | |
741 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 742 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 743 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
744 | ret = -EBUSY; |
745 | goto out; | |
746 | } | |
747 | ||
748 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 749 | if (mod->init && !mod->exit) { |
fb169793 | 750 | forced = try_force_unload(flags); |
1da177e4 LT |
751 | if (!forced) { |
752 | /* This module can't be removed */ | |
753 | ret = -EBUSY; | |
754 | goto out; | |
755 | } | |
756 | } | |
757 | ||
1da177e4 LT |
758 | ret = try_stop_module(mod, flags, &forced); |
759 | if (ret != 0) | |
760 | goto out; | |
761 | ||
df4b565e | 762 | mutex_unlock(&module_mutex); |
25985edc | 763 | /* Final destruction now no one is using it. */ |
df4b565e | 764 | if (mod->exit != NULL) |
1da177e4 | 765 | mod->exit(); |
df4b565e PO |
766 | blocking_notifier_call_chain(&module_notify_list, |
767 | MODULE_STATE_GOING, mod); | |
7e545d6e | 768 | klp_module_going(mod); |
7dcd182b JY |
769 | ftrace_release_mod(mod); |
770 | ||
22a9d645 | 771 | async_synchronize_full(); |
75676500 | 772 | |
e14af7ee | 773 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 774 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 775 | |
75676500 | 776 | free_module(mod); |
5d603311 KK |
777 | /* someone could wait for the module in add_unformed_module() */ |
778 | wake_up_all(&module_wq); | |
75676500 RR |
779 | return 0; |
780 | out: | |
6389a385 | 781 | mutex_unlock(&module_mutex); |
1da177e4 LT |
782 | return ret; |
783 | } | |
784 | ||
1da177e4 LT |
785 | void __symbol_put(const char *symbol) |
786 | { | |
0b96615c CH |
787 | struct find_symbol_arg fsa = { |
788 | .name = symbol, | |
789 | .gplok = true, | |
790 | }; | |
1da177e4 | 791 | |
24da1cbf | 792 | preempt_disable(); |
02b2fb45 | 793 | BUG_ON(!find_symbol(&fsa)); |
0b96615c | 794 | module_put(fsa.owner); |
24da1cbf | 795 | preempt_enable(); |
1da177e4 LT |
796 | } |
797 | EXPORT_SYMBOL(__symbol_put); | |
798 | ||
7d1d16e4 | 799 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
800 | void symbol_put_addr(void *addr) |
801 | { | |
5e376613 | 802 | struct module *modaddr; |
7d1d16e4 | 803 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 804 | |
7d1d16e4 | 805 | if (core_kernel_text(a)) |
5e376613 | 806 | return; |
1da177e4 | 807 | |
275d7d44 PZ |
808 | /* |
809 | * Even though we hold a reference on the module; we still need to | |
810 | * disable preemption in order to safely traverse the data structure. | |
811 | */ | |
812 | preempt_disable(); | |
7d1d16e4 | 813 | modaddr = __module_text_address(a); |
a6e6abd5 | 814 | BUG_ON(!modaddr); |
5e376613 | 815 | module_put(modaddr); |
275d7d44 | 816 | preempt_enable(); |
1da177e4 LT |
817 | } |
818 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
819 | ||
820 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 821 | struct module_kobject *mk, char *buffer) |
1da177e4 | 822 | { |
d5db139a | 823 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
824 | } |
825 | ||
cca3e707 KS |
826 | static struct module_attribute modinfo_refcnt = |
827 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 828 | |
d53799be SR |
829 | void __module_get(struct module *module) |
830 | { | |
831 | if (module) { | |
832 | preempt_disable(); | |
2f35c41f | 833 | atomic_inc(&module->refcnt); |
d53799be SR |
834 | trace_module_get(module, _RET_IP_); |
835 | preempt_enable(); | |
836 | } | |
837 | } | |
838 | EXPORT_SYMBOL(__module_get); | |
839 | ||
840 | bool try_module_get(struct module *module) | |
841 | { | |
842 | bool ret = true; | |
843 | ||
844 | if (module) { | |
845 | preempt_disable(); | |
e513cc1c MH |
846 | /* Note: here, we can fail to get a reference */ |
847 | if (likely(module_is_live(module) && | |
848 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 849 | trace_module_get(module, _RET_IP_); |
e513cc1c | 850 | else |
d53799be SR |
851 | ret = false; |
852 | ||
853 | preempt_enable(); | |
854 | } | |
855 | return ret; | |
856 | } | |
857 | EXPORT_SYMBOL(try_module_get); | |
858 | ||
f6a57033 AV |
859 | void module_put(struct module *module) |
860 | { | |
e513cc1c MH |
861 | int ret; |
862 | ||
f6a57033 | 863 | if (module) { |
e1783a24 | 864 | preempt_disable(); |
e513cc1c MH |
865 | ret = atomic_dec_if_positive(&module->refcnt); |
866 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 867 | trace_module_put(module, _RET_IP_); |
e1783a24 | 868 | preempt_enable(); |
f6a57033 AV |
869 | } |
870 | } | |
871 | EXPORT_SYMBOL(module_put); | |
872 | ||
1da177e4 | 873 | #else /* !CONFIG_MODULE_UNLOAD */ |
1da177e4 LT |
874 | static inline void module_unload_free(struct module *mod) |
875 | { | |
876 | } | |
877 | ||
7ef5264d | 878 | static int ref_module(struct module *a, struct module *b) |
1da177e4 | 879 | { |
9bea7f23 | 880 | return strong_try_module_get(b); |
1da177e4 LT |
881 | } |
882 | ||
9f85a4bb | 883 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 884 | { |
9f85a4bb | 885 | return 0; |
1da177e4 LT |
886 | } |
887 | #endif /* CONFIG_MODULE_UNLOAD */ | |
888 | ||
53999bf3 KW |
889 | static size_t module_flags_taint(struct module *mod, char *buf) |
890 | { | |
891 | size_t l = 0; | |
7fd8329b PM |
892 | int i; |
893 | ||
894 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
895 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 896 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 897 | } |
53999bf3 | 898 | |
53999bf3 KW |
899 | return l; |
900 | } | |
901 | ||
1f71740a | 902 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 903 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
904 | { |
905 | const char *state = "unknown"; | |
906 | ||
4befb026 | 907 | switch (mk->mod->state) { |
1f71740a KS |
908 | case MODULE_STATE_LIVE: |
909 | state = "live"; | |
910 | break; | |
911 | case MODULE_STATE_COMING: | |
912 | state = "coming"; | |
913 | break; | |
914 | case MODULE_STATE_GOING: | |
915 | state = "going"; | |
916 | break; | |
0d21b0e3 RR |
917 | default: |
918 | BUG(); | |
1f71740a KS |
919 | } |
920 | return sprintf(buffer, "%s\n", state); | |
921 | } | |
922 | ||
cca3e707 KS |
923 | static struct module_attribute modinfo_initstate = |
924 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 925 | |
88bfa324 KS |
926 | static ssize_t store_uevent(struct module_attribute *mattr, |
927 | struct module_kobject *mk, | |
928 | const char *buffer, size_t count) | |
929 | { | |
df44b479 PR |
930 | int rc; |
931 | ||
932 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
933 | return rc ? rc : count; | |
88bfa324 KS |
934 | } |
935 | ||
cca3e707 KS |
936 | struct module_attribute module_uevent = |
937 | __ATTR(uevent, 0200, NULL, store_uevent); | |
938 | ||
939 | static ssize_t show_coresize(struct module_attribute *mattr, | |
940 | struct module_kobject *mk, char *buffer) | |
941 | { | |
7523e4dc | 942 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
943 | } |
944 | ||
945 | static struct module_attribute modinfo_coresize = | |
946 | __ATTR(coresize, 0444, show_coresize, NULL); | |
947 | ||
948 | static ssize_t show_initsize(struct module_attribute *mattr, | |
949 | struct module_kobject *mk, char *buffer) | |
950 | { | |
7523e4dc | 951 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
952 | } |
953 | ||
954 | static struct module_attribute modinfo_initsize = | |
955 | __ATTR(initsize, 0444, show_initsize, NULL); | |
956 | ||
957 | static ssize_t show_taint(struct module_attribute *mattr, | |
958 | struct module_kobject *mk, char *buffer) | |
959 | { | |
960 | size_t l; | |
961 | ||
962 | l = module_flags_taint(mk->mod, buffer); | |
963 | buffer[l++] = '\n'; | |
964 | return l; | |
965 | } | |
966 | ||
967 | static struct module_attribute modinfo_taint = | |
968 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 969 | |
44c09535 | 970 | struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 971 | &module_uevent, |
03e88ae1 GKH |
972 | &modinfo_version, |
973 | &modinfo_srcversion, | |
cca3e707 KS |
974 | &modinfo_initstate, |
975 | &modinfo_coresize, | |
976 | &modinfo_initsize, | |
977 | &modinfo_taint, | |
03e88ae1 | 978 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 979 | &modinfo_refcnt, |
03e88ae1 GKH |
980 | #endif |
981 | NULL, | |
982 | }; | |
983 | ||
44c09535 AT |
984 | size_t modinfo_attrs_count = ARRAY_SIZE(modinfo_attrs); |
985 | ||
1da177e4 LT |
986 | static const char vermagic[] = VERMAGIC_STRING; |
987 | ||
47889798 | 988 | int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
989 | { |
990 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 991 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 992 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 993 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
994 | return 0; |
995 | #else | |
996 | return -ENOEXEC; | |
997 | #endif | |
998 | } | |
999 | ||
8651ec01 MM |
1000 | static char *get_modinfo(const struct load_info *info, const char *tag); |
1001 | static char *get_next_modinfo(const struct load_info *info, const char *tag, | |
1002 | char *prev); | |
1003 | ||
1004 | static int verify_namespace_is_imported(const struct load_info *info, | |
1005 | const struct kernel_symbol *sym, | |
1006 | struct module *mod) | |
1007 | { | |
1008 | const char *namespace; | |
1009 | char *imported_namespace; | |
1010 | ||
1011 | namespace = kernel_symbol_namespace(sym); | |
c3a6cf19 | 1012 | if (namespace && namespace[0]) { |
8651ec01 MM |
1013 | imported_namespace = get_modinfo(info, "import_ns"); |
1014 | while (imported_namespace) { | |
1015 | if (strcmp(namespace, imported_namespace) == 0) | |
1016 | return 0; | |
1017 | imported_namespace = get_next_modinfo( | |
1018 | info, "import_ns", imported_namespace); | |
1019 | } | |
3d52ec5e MM |
1020 | #ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
1021 | pr_warn( | |
1022 | #else | |
1023 | pr_err( | |
1024 | #endif | |
1025 | "%s: module uses symbol (%s) from namespace %s, but does not import it.\n", | |
1026 | mod->name, kernel_symbol_name(sym), namespace); | |
1027 | #ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS | |
8651ec01 | 1028 | return -EINVAL; |
3d52ec5e | 1029 | #endif |
8651ec01 MM |
1030 | } |
1031 | return 0; | |
1032 | } | |
1033 | ||
262e6ae7 CH |
1034 | static bool inherit_taint(struct module *mod, struct module *owner) |
1035 | { | |
1036 | if (!owner || !test_bit(TAINT_PROPRIETARY_MODULE, &owner->taints)) | |
1037 | return true; | |
1038 | ||
1039 | if (mod->using_gplonly_symbols) { | |
1040 | pr_err("%s: module using GPL-only symbols uses symbols from proprietary module %s.\n", | |
1041 | mod->name, owner->name); | |
1042 | return false; | |
1043 | } | |
1044 | ||
1045 | if (!test_bit(TAINT_PROPRIETARY_MODULE, &mod->taints)) { | |
1046 | pr_warn("%s: module uses symbols from proprietary module %s, inheriting taint.\n", | |
1047 | mod->name, owner->name); | |
1048 | set_bit(TAINT_PROPRIETARY_MODULE, &mod->taints); | |
1049 | } | |
1050 | return true; | |
1051 | } | |
8651ec01 | 1052 | |
75676500 | 1053 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1054 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1055 | const struct load_info *info, | |
414fd31b | 1056 | const char *name, |
9bea7f23 | 1057 | char ownername[]) |
1da177e4 | 1058 | { |
0b96615c CH |
1059 | struct find_symbol_arg fsa = { |
1060 | .name = name, | |
1061 | .gplok = !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), | |
1062 | .warn = true, | |
1063 | }; | |
9bea7f23 | 1064 | int err; |
1da177e4 | 1065 | |
d64810f5 PZ |
1066 | /* |
1067 | * The module_mutex should not be a heavily contended lock; | |
1068 | * if we get the occasional sleep here, we'll go an extra iteration | |
1069 | * in the wait_event_interruptible(), which is harmless. | |
1070 | */ | |
1071 | sched_annotate_sleep(); | |
75676500 | 1072 | mutex_lock(&module_mutex); |
0b96615c | 1073 | if (!find_symbol(&fsa)) |
9bea7f23 RR |
1074 | goto unlock; |
1075 | ||
0b96615c | 1076 | if (fsa.license == GPL_ONLY) |
262e6ae7 CH |
1077 | mod->using_gplonly_symbols = true; |
1078 | ||
0b96615c CH |
1079 | if (!inherit_taint(mod, fsa.owner)) { |
1080 | fsa.sym = NULL; | |
262e6ae7 CH |
1081 | goto getname; |
1082 | } | |
1083 | ||
0b96615c CH |
1084 | if (!check_version(info, name, mod, fsa.crc)) { |
1085 | fsa.sym = ERR_PTR(-EINVAL); | |
9bea7f23 | 1086 | goto getname; |
1da177e4 | 1087 | } |
9bea7f23 | 1088 | |
0b96615c | 1089 | err = verify_namespace_is_imported(info, fsa.sym, mod); |
8651ec01 | 1090 | if (err) { |
0b96615c | 1091 | fsa.sym = ERR_PTR(err); |
8651ec01 MM |
1092 | goto getname; |
1093 | } | |
1094 | ||
0b96615c | 1095 | err = ref_module(mod, fsa.owner); |
9bea7f23 | 1096 | if (err) { |
0b96615c | 1097 | fsa.sym = ERR_PTR(err); |
9bea7f23 RR |
1098 | goto getname; |
1099 | } | |
1100 | ||
1101 | getname: | |
1102 | /* We must make copy under the lock if we failed to get ref. */ | |
0b96615c | 1103 | strncpy(ownername, module_name(fsa.owner), MODULE_NAME_LEN); |
9bea7f23 | 1104 | unlock: |
75676500 | 1105 | mutex_unlock(&module_mutex); |
0b96615c | 1106 | return fsa.sym; |
1da177e4 LT |
1107 | } |
1108 | ||
49668688 RR |
1109 | static const struct kernel_symbol * |
1110 | resolve_symbol_wait(struct module *mod, | |
1111 | const struct load_info *info, | |
1112 | const char *name) | |
9bea7f23 RR |
1113 | { |
1114 | const struct kernel_symbol *ksym; | |
49668688 | 1115 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1116 | |
1117 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1118 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1119 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1120 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1121 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1122 | mod->name, owner); | |
9bea7f23 RR |
1123 | } |
1124 | return ksym; | |
1125 | } | |
1126 | ||
be1f221c | 1127 | void __weak module_memfree(void *module_region) |
74e08fcf | 1128 | { |
1a7b7d92 RE |
1129 | /* |
1130 | * This memory may be RO, and freeing RO memory in an interrupt is not | |
1131 | * supported by vmalloc. | |
1132 | */ | |
1133 | WARN_ON(in_interrupt()); | |
74e08fcf JB |
1134 | vfree(module_region); |
1135 | } | |
1136 | ||
1137 | void __weak module_arch_cleanup(struct module *mod) | |
1138 | { | |
1139 | } | |
1140 | ||
d453cded RR |
1141 | void __weak module_arch_freeing_init(struct module *mod) |
1142 | { | |
1143 | } | |
1144 | ||
cf68fffb ST |
1145 | static void cfi_cleanup(struct module *mod); |
1146 | ||
75676500 | 1147 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1148 | static void free_module(struct module *mod) |
1149 | { | |
7ead8b83 LZ |
1150 | trace_module_free(mod); |
1151 | ||
36b0360d | 1152 | mod_sysfs_teardown(mod); |
1da177e4 | 1153 | |
24b9f0d2 SS |
1154 | /* |
1155 | * We leave it in list to prevent duplicate loads, but make sure | |
1156 | * that noone uses it while it's being deconstructed. | |
1157 | */ | |
d3051b48 | 1158 | mutex_lock(&module_mutex); |
944a1fa0 | 1159 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 1160 | mutex_unlock(&module_mutex); |
944a1fa0 | 1161 | |
b82bab4b JB |
1162 | /* Remove dynamic debug info */ |
1163 | ddebug_remove_module(mod->name); | |
1164 | ||
1da177e4 LT |
1165 | /* Arch-specific cleanup. */ |
1166 | module_arch_cleanup(mod); | |
1167 | ||
1168 | /* Module unload stuff */ | |
1169 | module_unload_free(mod); | |
1170 | ||
e180a6b7 RR |
1171 | /* Free any allocated parameters. */ |
1172 | destroy_params(mod->kp, mod->num_kp); | |
1173 | ||
1ce15ef4 JY |
1174 | if (is_livepatch_module(mod)) |
1175 | free_module_elf(mod); | |
1176 | ||
944a1fa0 RR |
1177 | /* Now we can delete it from the lists */ |
1178 | mutex_lock(&module_mutex); | |
461e34ae MH |
1179 | /* Unlink carefully: kallsyms could be walking list. */ |
1180 | list_del_rcu(&mod->list); | |
93c2e105 | 1181 | mod_tree_remove(mod); |
0286b5ea | 1182 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 1183 | module_bug_cleanup(mod); |
0be964be | 1184 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 1185 | synchronize_rcu(); |
944a1fa0 RR |
1186 | mutex_unlock(&module_mutex); |
1187 | ||
cf68fffb ST |
1188 | /* Clean up CFI for the module. */ |
1189 | cfi_cleanup(mod); | |
1190 | ||
85c898db | 1191 | /* This may be empty, but that's OK */ |
d453cded | 1192 | module_arch_freeing_init(mod); |
7523e4dc | 1193 | module_memfree(mod->init_layout.base); |
1da177e4 | 1194 | kfree(mod->args); |
259354de | 1195 | percpu_modfree(mod); |
9f85a4bb | 1196 | |
35a9393c | 1197 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 1198 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 1199 | |
1da177e4 | 1200 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 1201 | module_memfree(mod->core_layout.base); |
1da177e4 LT |
1202 | } |
1203 | ||
1204 | void *__symbol_get(const char *symbol) | |
1205 | { | |
0b96615c CH |
1206 | struct find_symbol_arg fsa = { |
1207 | .name = symbol, | |
1208 | .gplok = true, | |
1209 | .warn = true, | |
1210 | }; | |
1da177e4 | 1211 | |
24da1cbf | 1212 | preempt_disable(); |
0b96615c CH |
1213 | if (!find_symbol(&fsa) || strong_try_module_get(fsa.owner)) { |
1214 | preempt_enable(); | |
1215 | return NULL; | |
1216 | } | |
24da1cbf | 1217 | preempt_enable(); |
0b96615c | 1218 | return (void *)kernel_symbol_value(fsa.sym); |
1da177e4 LT |
1219 | } |
1220 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1221 | ||
eea8b54d AN |
1222 | /* |
1223 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1224 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1225 | * |
1226 | * You must hold the module_mutex. | |
eea8b54d | 1227 | */ |
2d25bc55 | 1228 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 1229 | { |
b211104d | 1230 | unsigned int i; |
b211104d RR |
1231 | const struct kernel_symbol *s; |
1232 | struct { | |
1233 | const struct kernel_symbol *sym; | |
1234 | unsigned int num; | |
1235 | } arr[] = { | |
1236 | { mod->syms, mod->num_syms }, | |
1237 | { mod->gpl_syms, mod->num_gpl_syms }, | |
b211104d | 1238 | }; |
eea8b54d | 1239 | |
b211104d RR |
1240 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1241 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
0b96615c CH |
1242 | struct find_symbol_arg fsa = { |
1243 | .name = kernel_symbol_name(s), | |
1244 | .gplok = true, | |
1245 | }; | |
1246 | if (find_symbol(&fsa)) { | |
bddb12b3 | 1247 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 1248 | " (owned by %s)\n", |
7290d580 | 1249 | mod->name, kernel_symbol_name(s), |
0b96615c | 1250 | module_name(fsa.owner)); |
b211104d RR |
1251 | return -ENOEXEC; |
1252 | } | |
eea8b54d | 1253 | } |
b211104d RR |
1254 | } |
1255 | return 0; | |
eea8b54d AN |
1256 | } |
1257 | ||
ebfac7b7 FS |
1258 | static bool ignore_undef_symbol(Elf_Half emachine, const char *name) |
1259 | { | |
1260 | /* | |
1261 | * On x86, PIC code and Clang non-PIC code may have call foo@PLT. GNU as | |
1262 | * before 2.37 produces an unreferenced _GLOBAL_OFFSET_TABLE_ on x86-64. | |
1263 | * i386 has a similar problem but may not deserve a fix. | |
1264 | * | |
1265 | * If we ever have to ignore many symbols, consider refactoring the code to | |
1266 | * only warn if referenced by a relocation. | |
1267 | */ | |
1268 | if (emachine == EM_386 || emachine == EM_X86_64) | |
1269 | return !strcmp(name, "_GLOBAL_OFFSET_TABLE_"); | |
1270 | return false; | |
1271 | } | |
1272 | ||
9a4b9708 | 1273 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
1274 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
1275 | { | |
1276 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
1277 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 1278 | unsigned long secbase; |
49668688 | 1279 | unsigned int i; |
1da177e4 | 1280 | int ret = 0; |
414fd31b | 1281 | const struct kernel_symbol *ksym; |
1da177e4 | 1282 | |
49668688 RR |
1283 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
1284 | const char *name = info->strtab + sym[i].st_name; | |
1285 | ||
1da177e4 LT |
1286 | switch (sym[i].st_shndx) { |
1287 | case SHN_COMMON: | |
80375980 JM |
1288 | /* Ignore common symbols */ |
1289 | if (!strncmp(name, "__gnu_lto", 9)) | |
1290 | break; | |
1291 | ||
24b9f0d2 SS |
1292 | /* |
1293 | * We compiled with -fno-common. These are not | |
1294 | * supposed to happen. | |
1295 | */ | |
5e124169 | 1296 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 1297 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
1298 | mod->name); |
1299 | ret = -ENOEXEC; | |
1300 | break; | |
1301 | ||
1302 | case SHN_ABS: | |
1303 | /* Don't need to do anything */ | |
5e124169 | 1304 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
1305 | (long)sym[i].st_value); |
1306 | break; | |
1307 | ||
1ce15ef4 JY |
1308 | case SHN_LIVEPATCH: |
1309 | /* Livepatch symbols are resolved by livepatch */ | |
1310 | break; | |
1311 | ||
1da177e4 | 1312 | case SHN_UNDEF: |
49668688 | 1313 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 1314 | /* Ok if resolved. */ |
9bea7f23 | 1315 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 1316 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 1317 | break; |
414fd31b TA |
1318 | } |
1319 | ||
ebfac7b7 FS |
1320 | /* Ok if weak or ignored. */ |
1321 | if (!ksym && | |
1322 | (ELF_ST_BIND(sym[i].st_info) == STB_WEAK || | |
1323 | ignore_undef_symbol(info->hdr->e_machine, name))) | |
1da177e4 LT |
1324 | break; |
1325 | ||
9bea7f23 | 1326 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
1327 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
1328 | mod->name, name, ret); | |
1da177e4 LT |
1329 | break; |
1330 | ||
1331 | default: | |
1332 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 1333 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 1334 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 1335 | else |
49668688 | 1336 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
1337 | sym[i].st_value += secbase; |
1338 | break; | |
1339 | } | |
1340 | } | |
1341 | ||
1342 | return ret; | |
1343 | } | |
1344 | ||
49668688 | 1345 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
1346 | { |
1347 | unsigned int i; | |
1348 | int err = 0; | |
1349 | ||
1350 | /* Now do relocations. */ | |
49668688 RR |
1351 | for (i = 1; i < info->hdr->e_shnum; i++) { |
1352 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
1353 | |
1354 | /* Not a valid relocation section? */ | |
49668688 | 1355 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
1356 | continue; |
1357 | ||
1358 | /* Don't bother with non-allocated sections */ | |
49668688 | 1359 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
1360 | continue; |
1361 | ||
1ce15ef4 | 1362 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) |
7c8e2bdd JP |
1363 | err = klp_apply_section_relocs(mod, info->sechdrs, |
1364 | info->secstrings, | |
1365 | info->strtab, | |
1366 | info->index.sym, i, | |
1367 | NULL); | |
1368 | else if (info->sechdrs[i].sh_type == SHT_REL) | |
49668688 RR |
1369 | err = apply_relocate(info->sechdrs, info->strtab, |
1370 | info->index.sym, i, mod); | |
1371 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
1372 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
1373 | info->index.sym, i, mod); | |
22e268eb RR |
1374 | if (err < 0) |
1375 | break; | |
1376 | } | |
1377 | return err; | |
1378 | } | |
1379 | ||
088af9a6 HD |
1380 | /* Additional bytes needed by arch in front of individual sections */ |
1381 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1382 | unsigned int section) | |
1383 | { | |
1384 | /* default implementation just returns zero */ | |
1385 | return 0; | |
1386 | } | |
1387 | ||
1da177e4 | 1388 | /* Update size with this section: return offset. */ |
91fb02f3 | 1389 | long module_get_offset(struct module *mod, unsigned int *size, |
088af9a6 | 1390 | Elf_Shdr *sechdr, unsigned int section) |
1da177e4 LT |
1391 | { |
1392 | long ret; | |
1393 | ||
088af9a6 | 1394 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1395 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1396 | *size = ret + sechdr->sh_size; | |
1397 | return ret; | |
1398 | } | |
1399 | ||
055f23b7 JY |
1400 | static bool module_init_layout_section(const char *sname) |
1401 | { | |
1402 | #ifndef CONFIG_MODULE_UNLOAD | |
1403 | if (module_exit_section(sname)) | |
1404 | return true; | |
1405 | #endif | |
1406 | return module_init_section(sname); | |
1407 | } | |
1408 | ||
24b9f0d2 SS |
1409 | /* |
1410 | * Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1411 | * might -- code, read-only data, read-write data, small data. Tally | |
1412 | * sizes, and place the offsets into sh_entsize fields: high bit means it | |
1413 | * belongs in init. | |
1414 | */ | |
49668688 | 1415 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
1416 | { |
1417 | static unsigned long const masks[][2] = { | |
24b9f0d2 SS |
1418 | /* |
1419 | * NOTE: all executable code must be the first section | |
1da177e4 | 1420 | * in this array; otherwise modify the text_size |
24b9f0d2 SS |
1421 | * finder in the two loops below |
1422 | */ | |
1da177e4 LT |
1423 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
1424 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 1425 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
1426 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
1427 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1428 | }; | |
1429 | unsigned int m, i; | |
1430 | ||
49668688 RR |
1431 | for (i = 0; i < info->hdr->e_shnum; i++) |
1432 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 1433 | |
5e124169 | 1434 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 1435 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
1436 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
1437 | Elf_Shdr *s = &info->sechdrs[i]; | |
1438 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
1439 | |
1440 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1441 | || (s->sh_flags & masks[m][1]) | |
1442 | || s->sh_entsize != ~0UL | |
055f23b7 | 1443 | || module_init_layout_section(sname)) |
1da177e4 | 1444 | continue; |
91fb02f3 | 1445 | s->sh_entsize = module_get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 1446 | pr_debug("\t%s\n", sname); |
1da177e4 | 1447 | } |
84e1c6bb | 1448 | switch (m) { |
1449 | case 0: /* executable */ | |
7523e4dc RR |
1450 | mod->core_layout.size = debug_align(mod->core_layout.size); |
1451 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb | 1452 | break; |
1453 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
1454 | mod->core_layout.size = debug_align(mod->core_layout.size); |
1455 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 1456 | break; |
444d13ff JY |
1457 | case 2: /* RO after init */ |
1458 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
1459 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
1460 | break; | |
1461 | case 4: /* whole core */ | |
7523e4dc | 1462 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb | 1463 | break; |
1464 | } | |
1da177e4 LT |
1465 | } |
1466 | ||
5e124169 | 1467 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 1468 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
1469 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
1470 | Elf_Shdr *s = &info->sechdrs[i]; | |
1471 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
1472 | |
1473 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1474 | || (s->sh_flags & masks[m][1]) | |
1475 | || s->sh_entsize != ~0UL | |
055f23b7 | 1476 | || !module_init_layout_section(sname)) |
1da177e4 | 1477 | continue; |
91fb02f3 | 1478 | s->sh_entsize = (module_get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 1479 | | INIT_OFFSET_MASK); |
5e124169 | 1480 | pr_debug("\t%s\n", sname); |
1da177e4 | 1481 | } |
84e1c6bb | 1482 | switch (m) { |
1483 | case 0: /* executable */ | |
7523e4dc RR |
1484 | mod->init_layout.size = debug_align(mod->init_layout.size); |
1485 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb | 1486 | break; |
1487 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
1488 | mod->init_layout.size = debug_align(mod->init_layout.size); |
1489 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 1490 | break; |
444d13ff JY |
1491 | case 2: |
1492 | /* | |
1493 | * RO after init doesn't apply to init_layout (only | |
1494 | * core_layout), so it just takes the value of ro_size. | |
1495 | */ | |
1496 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
1497 | break; | |
1498 | case 4: /* whole init */ | |
7523e4dc | 1499 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb | 1500 | break; |
1501 | } | |
1da177e4 LT |
1502 | } |
1503 | } | |
1504 | ||
1da177e4 LT |
1505 | static void set_license(struct module *mod, const char *license) |
1506 | { | |
1507 | if (!license) | |
1508 | license = "unspecified"; | |
1509 | ||
fa3ba2e8 | 1510 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1511 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
1512 | pr_warn("%s: module license '%s' taints kernel.\n", |
1513 | mod->name, license); | |
373d4d09 RR |
1514 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
1515 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
1516 | } |
1517 | } | |
1518 | ||
1519 | /* Parse tag=value strings from .modinfo section */ | |
1520 | static char *next_string(char *string, unsigned long *secsize) | |
1521 | { | |
1522 | /* Skip non-zero chars */ | |
1523 | while (string[0]) { | |
1524 | string++; | |
1525 | if ((*secsize)-- <= 1) | |
1526 | return NULL; | |
1527 | } | |
1528 | ||
1529 | /* Skip any zero padding. */ | |
1530 | while (!string[0]) { | |
1531 | string++; | |
1532 | if ((*secsize)-- <= 1) | |
1533 | return NULL; | |
1534 | } | |
1535 | return string; | |
1536 | } | |
1537 | ||
c5e4a062 MM |
1538 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
1539 | char *prev) | |
1da177e4 LT |
1540 | { |
1541 | char *p; | |
1542 | unsigned int taglen = strlen(tag); | |
49668688 RR |
1543 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
1544 | unsigned long size = infosec->sh_size; | |
1da177e4 | 1545 | |
5fdc7db6 JY |
1546 | /* |
1547 | * get_modinfo() calls made before rewrite_section_headers() | |
1548 | * must use sh_offset, as sh_addr isn't set! | |
1549 | */ | |
c5e4a062 MM |
1550 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
1551 | ||
1552 | if (prev) { | |
1553 | size -= prev - modinfo; | |
1554 | modinfo = next_string(prev, &size); | |
1555 | } | |
1556 | ||
1557 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
1558 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
1559 | return p + taglen + 1; | |
1560 | } | |
1561 | return NULL; | |
1562 | } | |
1563 | ||
c5e4a062 MM |
1564 | static char *get_modinfo(const struct load_info *info, const char *tag) |
1565 | { | |
1566 | return get_next_modinfo(info, tag, NULL); | |
1567 | } | |
1568 | ||
49668688 | 1569 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
1570 | { |
1571 | struct module_attribute *attr; | |
1572 | int i; | |
1573 | ||
1574 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1575 | if (attr->setup) | |
49668688 | 1576 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
1577 | } |
1578 | } | |
c988d2b2 | 1579 | |
a263f776 RR |
1580 | static void free_modinfo(struct module *mod) |
1581 | { | |
1582 | struct module_attribute *attr; | |
1583 | int i; | |
1584 | ||
1585 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1586 | if (attr->free) | |
1587 | attr->free(mod); | |
1588 | } | |
1589 | } | |
1590 | ||
52796312 | 1591 | static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
346e15be | 1592 | { |
811d66a0 RR |
1593 | if (!debug) |
1594 | return; | |
513770f5 | 1595 | ddebug_add_module(debug, num, mod->name); |
5e458cc0 | 1596 | } |
346e15be | 1597 | |
52796312 | 1598 | static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
ff49d74a YS |
1599 | { |
1600 | if (debug) | |
52796312 | 1601 | ddebug_remove_module(mod->name); |
ff49d74a YS |
1602 | } |
1603 | ||
74e08fcf JB |
1604 | void * __weak module_alloc(unsigned long size) |
1605 | { | |
7a0e27b2 CH |
1606 | return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, |
1607 | GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, | |
a3a66c38 | 1608 | NUMA_NO_NODE, __builtin_return_address(0)); |
74e08fcf JB |
1609 | } |
1610 | ||
23189766 VW |
1611 | bool __weak module_init_section(const char *name) |
1612 | { | |
1613 | return strstarts(name, ".init"); | |
1614 | } | |
1615 | ||
38b37d63 MS |
1616 | bool __weak module_exit_section(const char *name) |
1617 | { | |
1618 | return strstarts(name, ".exit"); | |
1619 | } | |
1620 | ||
ec2a2959 | 1621 | static int validate_section_offset(struct load_info *info, Elf_Shdr *shdr) |
40dd2560 | 1622 | { |
d83d42d0 SK |
1623 | #if defined(CONFIG_64BIT) |
1624 | unsigned long long secend; | |
1625 | #else | |
ec2a2959 | 1626 | unsigned long secend; |
d83d42d0 | 1627 | #endif |
ec2a2959 FL |
1628 | |
1629 | /* | |
1630 | * Check for both overflow and offset/size being | |
1631 | * too large. | |
1632 | */ | |
1633 | secend = shdr->sh_offset + shdr->sh_size; | |
1634 | if (secend < shdr->sh_offset || secend > info->len) | |
1635 | return -ENOEXEC; | |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * Sanity checks against invalid binaries, wrong arch, weird elf version. | |
1642 | * | |
1643 | * Also do basic validity checks against section offsets and sizes, the | |
1644 | * section name string table, and the indices used for it (sh_name). | |
1645 | */ | |
1646 | static int elf_validity_check(struct load_info *info) | |
1647 | { | |
1648 | unsigned int i; | |
1649 | Elf_Shdr *shdr, *strhdr; | |
1650 | int err; | |
1651 | ||
7fd982f3 SK |
1652 | if (info->len < sizeof(*(info->hdr))) { |
1653 | pr_err("Invalid ELF header len %lu\n", info->len); | |
1654 | goto no_exec; | |
1655 | } | |
34e1169d | 1656 | |
7fd982f3 SK |
1657 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0) { |
1658 | pr_err("Invalid ELF header magic: != %s\n", ELFMAG); | |
1659 | goto no_exec; | |
1660 | } | |
1661 | if (info->hdr->e_type != ET_REL) { | |
1662 | pr_err("Invalid ELF header type: %u != %u\n", | |
1663 | info->hdr->e_type, ET_REL); | |
1664 | goto no_exec; | |
1665 | } | |
1666 | if (!elf_check_arch(info->hdr)) { | |
1667 | pr_err("Invalid architecture in ELF header: %u\n", | |
1668 | info->hdr->e_machine); | |
1669 | goto no_exec; | |
1670 | } | |
1671 | if (info->hdr->e_shentsize != sizeof(Elf_Shdr)) { | |
1672 | pr_err("Invalid ELF section header size\n"); | |
1673 | goto no_exec; | |
1674 | } | |
34e1169d | 1675 | |
ec2a2959 FL |
1676 | /* |
1677 | * e_shnum is 16 bits, and sizeof(Elf_Shdr) is | |
1678 | * known and small. So e_shnum * sizeof(Elf_Shdr) | |
1679 | * will not overflow unsigned long on any platform. | |
1680 | */ | |
34e1169d KC |
1681 | if (info->hdr->e_shoff >= info->len |
1682 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
7fd982f3 SK |
1683 | info->len - info->hdr->e_shoff)) { |
1684 | pr_err("Invalid ELF section header overflow\n"); | |
1685 | goto no_exec; | |
1686 | } | |
40dd2560 | 1687 | |
ec2a2959 FL |
1688 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; |
1689 | ||
1690 | /* | |
1691 | * Verify if the section name table index is valid. | |
1692 | */ | |
1693 | if (info->hdr->e_shstrndx == SHN_UNDEF | |
7fd982f3 SK |
1694 | || info->hdr->e_shstrndx >= info->hdr->e_shnum) { |
1695 | pr_err("Invalid ELF section name index: %d || e_shstrndx (%d) >= e_shnum (%d)\n", | |
1696 | info->hdr->e_shstrndx, info->hdr->e_shstrndx, | |
1697 | info->hdr->e_shnum); | |
1698 | goto no_exec; | |
1699 | } | |
ec2a2959 FL |
1700 | |
1701 | strhdr = &info->sechdrs[info->hdr->e_shstrndx]; | |
1702 | err = validate_section_offset(info, strhdr); | |
7fd982f3 SK |
1703 | if (err < 0) { |
1704 | pr_err("Invalid ELF section hdr(type %u)\n", strhdr->sh_type); | |
ec2a2959 | 1705 | return err; |
7fd982f3 | 1706 | } |
ec2a2959 FL |
1707 | |
1708 | /* | |
1709 | * The section name table must be NUL-terminated, as required | |
1710 | * by the spec. This makes strcmp and pr_* calls that access | |
1711 | * strings in the section safe. | |
1712 | */ | |
1713 | info->secstrings = (void *)info->hdr + strhdr->sh_offset; | |
7fd982f3 SK |
1714 | if (info->secstrings[strhdr->sh_size - 1] != '\0') { |
1715 | pr_err("ELF Spec violation: section name table isn't null terminated\n"); | |
1716 | goto no_exec; | |
1717 | } | |
ec2a2959 FL |
1718 | |
1719 | /* | |
1720 | * The code assumes that section 0 has a length of zero and | |
1721 | * an addr of zero, so check for it. | |
1722 | */ | |
1723 | if (info->sechdrs[0].sh_type != SHT_NULL | |
1724 | || info->sechdrs[0].sh_size != 0 | |
7fd982f3 SK |
1725 | || info->sechdrs[0].sh_addr != 0) { |
1726 | pr_err("ELF Spec violation: section 0 type(%d)!=SH_NULL or non-zero len or addr\n", | |
1727 | info->sechdrs[0].sh_type); | |
1728 | goto no_exec; | |
1729 | } | |
ec2a2959 FL |
1730 | |
1731 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
1732 | shdr = &info->sechdrs[i]; | |
1733 | switch (shdr->sh_type) { | |
1734 | case SHT_NULL: | |
1735 | case SHT_NOBITS: | |
1736 | continue; | |
1737 | case SHT_SYMTAB: | |
1738 | if (shdr->sh_link == SHN_UNDEF | |
7fd982f3 SK |
1739 | || shdr->sh_link >= info->hdr->e_shnum) { |
1740 | pr_err("Invalid ELF sh_link!=SHN_UNDEF(%d) or (sh_link(%d) >= hdr->e_shnum(%d)\n", | |
1741 | shdr->sh_link, shdr->sh_link, | |
1742 | info->hdr->e_shnum); | |
1743 | goto no_exec; | |
1744 | } | |
ec2a2959 FL |
1745 | fallthrough; |
1746 | default: | |
1747 | err = validate_section_offset(info, shdr); | |
1748 | if (err < 0) { | |
1749 | pr_err("Invalid ELF section in module (section %u type %u)\n", | |
1750 | i, shdr->sh_type); | |
1751 | return err; | |
1752 | } | |
1753 | ||
1754 | if (shdr->sh_flags & SHF_ALLOC) { | |
1755 | if (shdr->sh_name >= strhdr->sh_size) { | |
1756 | pr_err("Invalid ELF section name in module (section %u type %u)\n", | |
1757 | i, shdr->sh_type); | |
1758 | return -ENOEXEC; | |
1759 | } | |
1760 | } | |
1761 | break; | |
1762 | } | |
1763 | } | |
1764 | ||
34e1169d | 1765 | return 0; |
7fd982f3 SK |
1766 | |
1767 | no_exec: | |
1768 | return -ENOEXEC; | |
34e1169d KC |
1769 | } |
1770 | ||
3afe9f84 LT |
1771 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
1772 | ||
1773 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
1774 | { | |
1775 | do { | |
1776 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
1777 | ||
1778 | if (copy_from_user(dst, usrc, n) != 0) | |
1779 | return -EFAULT; | |
1780 | cond_resched(); | |
1781 | dst += n; | |
1782 | usrc += n; | |
1783 | len -= n; | |
1784 | } while (len); | |
1785 | return 0; | |
1786 | } | |
1787 | ||
2992ef29 | 1788 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 1789 | { |
1be9473e AT |
1790 | if (!get_modinfo(info, "livepatch")) |
1791 | /* Nothing more to do */ | |
1792 | return 0; | |
1793 | ||
1794 | if (set_livepatch_module(mod)) { | |
2992ef29 | 1795 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); |
7598d167 | 1796 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
1be9473e AT |
1797 | mod->name); |
1798 | return 0; | |
1ce15ef4 JY |
1799 | } |
1800 | ||
1be9473e AT |
1801 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", |
1802 | mod->name); | |
1803 | return -ENOEXEC; | |
1ce15ef4 | 1804 | } |
1ce15ef4 | 1805 | |
caf7501a AK |
1806 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
1807 | { | |
1808 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
1809 | return; | |
1810 | ||
1811 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
1812 | mod->name); | |
1813 | } | |
1814 | ||
34e1169d KC |
1815 | /* Sets info->hdr and info->len. */ |
1816 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
1817 | struct load_info *info) | |
40dd2560 RR |
1818 | { |
1819 | int err; | |
40dd2560 | 1820 | |
34e1169d KC |
1821 | info->len = len; |
1822 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
1823 | return -ENOEXEC; |
1824 | ||
38f90173 | 1825 | err = security_kernel_load_data(LOADING_MODULE, true); |
2e72d51b KC |
1826 | if (err) |
1827 | return err; | |
1828 | ||
40dd2560 | 1829 | /* Suck in entire file: we'll want most of it. */ |
88dca4ca | 1830 | info->hdr = __vmalloc(info->len, GFP_KERNEL | __GFP_NOWARN); |
34e1169d | 1831 | if (!info->hdr) |
40dd2560 RR |
1832 | return -ENOMEM; |
1833 | ||
3afe9f84 | 1834 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
38f90173 KC |
1835 | err = -EFAULT; |
1836 | goto out; | |
40dd2560 RR |
1837 | } |
1838 | ||
38f90173 KC |
1839 | err = security_kernel_post_load_data((char *)info->hdr, info->len, |
1840 | LOADING_MODULE, "init_module"); | |
1841 | out: | |
1842 | if (err) | |
1843 | vfree(info->hdr); | |
1844 | ||
1845 | return err; | |
34e1169d KC |
1846 | } |
1847 | ||
b1ae6dc4 | 1848 | static void free_copy(struct load_info *info, int flags) |
d913188c | 1849 | { |
b1ae6dc4 DT |
1850 | if (flags & MODULE_INIT_COMPRESSED_FILE) |
1851 | module_decompress_cleanup(info); | |
1852 | else | |
1853 | vfree(info->hdr); | |
d913188c RR |
1854 | } |
1855 | ||
2f3238ae | 1856 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
1857 | { |
1858 | unsigned int i; | |
1859 | ||
1860 | /* This should always be true, but let's be sure. */ | |
1861 | info->sechdrs[0].sh_addr = 0; | |
1862 | ||
1863 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
1864 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
8b5f61a7 | 1865 | |
24b9f0d2 SS |
1866 | /* |
1867 | * Mark all sections sh_addr with their address in the | |
1868 | * temporary image. | |
1869 | */ | |
8b5f61a7 RR |
1870 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; |
1871 | ||
8b5f61a7 | 1872 | } |
d6df72a0 RR |
1873 | |
1874 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 1875 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 1876 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 1877 | |
8b5f61a7 RR |
1878 | return 0; |
1879 | } | |
1880 | ||
3264d3f9 LT |
1881 | /* |
1882 | * Set up our basic convenience variables (pointers to section headers, | |
1883 | * search for module section index etc), and do some basic section | |
1884 | * verification. | |
1885 | * | |
81a0abd9 JY |
1886 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
1887 | * will be allocated in move_module(). | |
3264d3f9 | 1888 | */ |
81a0abd9 | 1889 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
1890 | { |
1891 | unsigned int i; | |
3264d3f9 | 1892 | |
5fdc7db6 JY |
1893 | /* Try to find a name early so we can log errors with a module name */ |
1894 | info->index.info = find_sec(info, ".modinfo"); | |
708e0ada | 1895 | if (info->index.info) |
5fdc7db6 | 1896 | info->name = get_modinfo(info, "name"); |
3264d3f9 | 1897 | |
8b5f61a7 RR |
1898 | /* Find internal symbols and strings. */ |
1899 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
1900 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
1901 | info->index.sym = i; | |
1902 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
1903 | info->strtab = (char *)info->hdr |
1904 | + info->sechdrs[info->index.str].sh_offset; | |
1905 | break; | |
3264d3f9 | 1906 | } |
3264d3f9 LT |
1907 | } |
1908 | ||
5fdc7db6 | 1909 | if (info->index.sym == 0) { |
708e0ada JY |
1910 | pr_warn("%s: module has no symbols (stripped?)\n", |
1911 | info->name ?: "(missing .modinfo section or name field)"); | |
5fdc7db6 JY |
1912 | return -ENOEXEC; |
1913 | } | |
1914 | ||
49668688 | 1915 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 1916 | if (!info->index.mod) { |
3e2e857f | 1917 | pr_warn("%s: No module found in object\n", |
708e0ada | 1918 | info->name ?: "(missing .modinfo section or name field)"); |
81a0abd9 | 1919 | return -ENOEXEC; |
3264d3f9 LT |
1920 | } |
1921 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 1922 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 1923 | |
3e2e857f | 1924 | /* |
5fdc7db6 | 1925 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
1926 | * on-disk struct mod 'name' field. |
1927 | */ | |
1928 | if (!info->name) | |
81a0abd9 | 1929 | info->name = info->mod->name; |
3e2e857f | 1930 | |
5fdc7db6 JY |
1931 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
1932 | info->index.vers = 0; /* Pretend no __versions section! */ | |
1933 | else | |
1934 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 1935 | |
49668688 | 1936 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 1937 | |
81a0abd9 | 1938 | return 0; |
3264d3f9 LT |
1939 | } |
1940 | ||
2f3238ae | 1941 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 1942 | { |
49668688 | 1943 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
1944 | int err; |
1945 | ||
2f3238ae RR |
1946 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
1947 | modmagic = NULL; | |
1948 | ||
40dd2560 RR |
1949 | /* This is allowed: modprobe --force will invalidate it. */ |
1950 | if (!modmagic) { | |
1951 | err = try_to_force_load(mod, "bad vermagic"); | |
1952 | if (err) | |
1953 | return err; | |
49668688 | 1954 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 1955 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 1956 | info->name, modmagic, vermagic); |
40dd2560 RR |
1957 | return -ENOEXEC; |
1958 | } | |
1959 | ||
3205c36c LP |
1960 | if (!get_modinfo(info, "intree")) { |
1961 | if (!test_taint(TAINT_OOT_MODULE)) | |
1962 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
1963 | mod->name); | |
373d4d09 | 1964 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 1965 | } |
2449b8ba | 1966 | |
caf7501a AK |
1967 | check_modinfo_retpoline(mod, info); |
1968 | ||
49668688 | 1969 | if (get_modinfo(info, "staging")) { |
373d4d09 | 1970 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
1971 | pr_warn("%s: module is from the staging directory, the quality " |
1972 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 1973 | } |
22e268eb | 1974 | |
2992ef29 | 1975 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
1976 | if (err) |
1977 | return err; | |
1978 | ||
22e268eb | 1979 | /* Set up license info based on the info section */ |
49668688 | 1980 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 1981 | |
40dd2560 RR |
1982 | return 0; |
1983 | } | |
1984 | ||
eb3057df | 1985 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 1986 | { |
49668688 | 1987 | mod->kp = section_objs(info, "__param", |
f91a13bb | 1988 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 1989 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 1990 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
1991 | mod->crcs = section_addr(info, "__kcrctab"); |
1992 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
1993 | sizeof(*mod->gpl_syms), |
1994 | &mod->num_gpl_syms); | |
49668688 | 1995 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
f91a13bb | 1996 | |
f91a13bb | 1997 | #ifdef CONFIG_CONSTRUCTORS |
49668688 | 1998 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 1999 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
2000 | if (!mod->ctors) |
2001 | mod->ctors = section_objs(info, ".init_array", | |
2002 | sizeof(*mod->ctors), &mod->num_ctors); | |
2003 | else if (find_sec(info, ".init_array")) { | |
2004 | /* | |
2005 | * This shouldn't happen with same compiler and binutils | |
2006 | * building all parts of the module. | |
2007 | */ | |
6da0b565 | 2008 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
2009 | mod->name); |
2010 | return -EINVAL; | |
2011 | } | |
f91a13bb LT |
2012 | #endif |
2013 | ||
66e9b071 TG |
2014 | mod->noinstr_text_start = section_objs(info, ".noinstr.text", 1, |
2015 | &mod->noinstr_text_size); | |
2016 | ||
f91a13bb | 2017 | #ifdef CONFIG_TRACEPOINTS |
65498646 MD |
2018 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2019 | sizeof(*mod->tracepoints_ptrs), | |
2020 | &mod->num_tracepoints); | |
f91a13bb | 2021 | #endif |
fe15b50c PM |
2022 | #ifdef CONFIG_TREE_SRCU |
2023 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
2024 | sizeof(*mod->srcu_struct_ptrs), | |
2025 | &mod->num_srcu_structs); | |
2026 | #endif | |
a38d1107 MM |
2027 | #ifdef CONFIG_BPF_EVENTS |
2028 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
2029 | sizeof(*mod->bpf_raw_events), | |
2030 | &mod->num_bpf_raw_events); | |
2031 | #endif | |
36e68442 AN |
2032 | #ifdef CONFIG_DEBUG_INFO_BTF_MODULES |
2033 | mod->btf_data = any_section_objs(info, ".BTF", 1, &mod->btf_data_size); | |
2034 | #endif | |
e9666d10 | 2035 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
2036 | mod->jump_entries = section_objs(info, "__jump_table", |
2037 | sizeof(*mod->jump_entries), | |
2038 | &mod->num_jump_entries); | |
2039 | #endif | |
f91a13bb | 2040 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2041 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2042 | sizeof(*mod->trace_events), |
2043 | &mod->num_trace_events); | |
99be647c JL |
2044 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
2045 | sizeof(*mod->trace_evals), | |
2046 | &mod->num_trace_evals); | |
f91a13bb | 2047 | #endif |
13b9b6e7 SR |
2048 | #ifdef CONFIG_TRACING |
2049 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2050 | sizeof(*mod->trace_bprintk_fmt_start), | |
2051 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 2052 | #endif |
f91a13bb LT |
2053 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2054 | /* sechdrs[0].sh_size is always zero */ | |
a1326b17 | 2055 | mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION, |
f91a13bb LT |
2056 | sizeof(*mod->ftrace_callsites), |
2057 | &mod->num_ftrace_callsites); | |
2058 | #endif | |
540adea3 MH |
2059 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
2060 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
2061 | sizeof(*mod->ei_funcs), | |
2062 | &mod->num_ei_funcs); | |
1e6769b0 MH |
2063 | #endif |
2064 | #ifdef CONFIG_KPROBES | |
2065 | mod->kprobes_text_start = section_objs(info, ".kprobes.text", 1, | |
2066 | &mod->kprobes_text_size); | |
16db6264 MH |
2067 | mod->kprobe_blacklist = section_objs(info, "_kprobe_blacklist", |
2068 | sizeof(unsigned long), | |
2069 | &mod->num_kprobe_blacklist); | |
9183c3f9 | 2070 | #endif |
33701557 CD |
2071 | #ifdef CONFIG_PRINTK_INDEX |
2072 | mod->printk_index_start = section_objs(info, ".printk_index", | |
2073 | sizeof(*mod->printk_index_start), | |
2074 | &mod->printk_index_size); | |
2075 | #endif | |
9183c3f9 JP |
2076 | #ifdef CONFIG_HAVE_STATIC_CALL_INLINE |
2077 | mod->static_call_sites = section_objs(info, ".static_call_sites", | |
2078 | sizeof(*mod->static_call_sites), | |
2079 | &mod->num_static_call_sites); | |
92ace999 | 2080 | #endif |
811d66a0 RR |
2081 | mod->extable = section_objs(info, "__ex_table", |
2082 | sizeof(*mod->extable), &mod->num_exentries); | |
2083 | ||
49668688 | 2084 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 2085 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 | 2086 | |
e5ebffe1 | 2087 | info->debug = section_objs(info, "__dyndbg", |
811d66a0 | 2088 | sizeof(*info->debug), &info->num_debug); |
eb3057df FH |
2089 | |
2090 | return 0; | |
f91a13bb LT |
2091 | } |
2092 | ||
49668688 | 2093 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2094 | { |
2095 | int i; | |
2096 | void *ptr; | |
2097 | ||
2098 | /* Do the allocs. */ | |
7523e4dc | 2099 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
2100 | /* |
2101 | * The pointer to this block is stored in the module structure | |
2102 | * which is inside the block. Just mark it as not being a | |
2103 | * leak. | |
2104 | */ | |
2105 | kmemleak_not_leak(ptr); | |
2106 | if (!ptr) | |
d913188c | 2107 | return -ENOMEM; |
65b8a9b4 | 2108 | |
7523e4dc RR |
2109 | memset(ptr, 0, mod->core_layout.size); |
2110 | mod->core_layout.base = ptr; | |
65b8a9b4 | 2111 | |
7523e4dc RR |
2112 | if (mod->init_layout.size) { |
2113 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
2114 | /* |
2115 | * The pointer to this block is stored in the module structure | |
2116 | * which is inside the block. This block doesn't need to be | |
2117 | * scanned as it contains data and code that will be freed | |
2118 | * after the module is initialized. | |
2119 | */ | |
2120 | kmemleak_ignore(ptr); | |
2121 | if (!ptr) { | |
7523e4dc | 2122 | module_memfree(mod->core_layout.base); |
82fab442 RR |
2123 | return -ENOMEM; |
2124 | } | |
7523e4dc RR |
2125 | memset(ptr, 0, mod->init_layout.size); |
2126 | mod->init_layout.base = ptr; | |
82fab442 | 2127 | } else |
7523e4dc | 2128 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
2129 | |
2130 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 2131 | pr_debug("final section addresses:\n"); |
49668688 | 2132 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2133 | void *dest; |
49668688 | 2134 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2135 | |
49668688 | 2136 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2137 | continue; |
2138 | ||
49668688 | 2139 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 2140 | dest = mod->init_layout.base |
49668688 | 2141 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 2142 | else |
7523e4dc | 2143 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 2144 | |
49668688 RR |
2145 | if (shdr->sh_type != SHT_NOBITS) |
2146 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 2147 | /* Update sh_addr to point to copy in image. */ |
49668688 | 2148 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
2149 | pr_debug("\t0x%lx %s\n", |
2150 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 2151 | } |
d913188c RR |
2152 | |
2153 | return 0; | |
65b8a9b4 LT |
2154 | } |
2155 | ||
49668688 | 2156 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 2157 | { |
3205c36c LP |
2158 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
2159 | ||
22e268eb RR |
2160 | /* |
2161 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2162 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2163 | * using GPL-only symbols it needs. | |
2164 | */ | |
2165 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 2166 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
2167 | |
2168 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2169 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
2170 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2171 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 2172 | |
c99af375 MG |
2173 | /* lve claims to be GPL but upstream won't provide source */ |
2174 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
2175 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2176 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 2177 | |
3205c36c LP |
2178 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
2179 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
2180 | ||
22e268eb | 2181 | #ifdef CONFIG_MODVERSIONS |
36794822 CH |
2182 | if ((mod->num_syms && !mod->crcs) || |
2183 | (mod->num_gpl_syms && !mod->gpl_crcs)) { | |
22e268eb RR |
2184 | return try_to_force_load(mod, |
2185 | "no versions for exported symbols"); | |
2186 | } | |
2187 | #endif | |
2188 | return 0; | |
2189 | } | |
2190 | ||
2191 | static void flush_module_icache(const struct module *mod) | |
2192 | { | |
22e268eb RR |
2193 | /* |
2194 | * Flush the instruction cache, since we've played with text. | |
2195 | * Do it before processing of module parameters, so the module | |
2196 | * can provide parameter accessor functions of its own. | |
2197 | */ | |
7523e4dc RR |
2198 | if (mod->init_layout.base) |
2199 | flush_icache_range((unsigned long)mod->init_layout.base, | |
2200 | (unsigned long)mod->init_layout.base | |
2201 | + mod->init_layout.size); | |
2202 | flush_icache_range((unsigned long)mod->core_layout.base, | |
2203 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
2204 | } |
2205 | ||
74e08fcf JB |
2206 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
2207 | Elf_Shdr *sechdrs, | |
2208 | char *secstrings, | |
2209 | struct module *mod) | |
2210 | { | |
2211 | return 0; | |
2212 | } | |
2213 | ||
be7de5f9 PB |
2214 | /* module_blacklist is a comma-separated list of module names */ |
2215 | static char *module_blacklist; | |
96b5b194 | 2216 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
2217 | { |
2218 | const char *p; | |
2219 | size_t len; | |
2220 | ||
2221 | if (!module_blacklist) | |
2222 | return false; | |
2223 | ||
2224 | for (p = module_blacklist; *p; p += len) { | |
2225 | len = strcspn(p, ","); | |
2226 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
2227 | return true; | |
2228 | if (p[len] == ',') | |
2229 | len++; | |
2230 | } | |
2231 | return false; | |
2232 | } | |
2233 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
2234 | ||
2f3238ae | 2235 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 2236 | { |
1da177e4 | 2237 | struct module *mod; |
444d13ff | 2238 | unsigned int ndx; |
d913188c | 2239 | int err; |
3ae91c21 | 2240 | |
81a0abd9 | 2241 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
2242 | if (err) |
2243 | return ERR_PTR(err); | |
1da177e4 | 2244 | |
1da177e4 | 2245 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 2246 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 2247 | info->secstrings, info->mod); |
1da177e4 | 2248 | if (err < 0) |
8d8022e8 | 2249 | return ERR_PTR(err); |
1da177e4 | 2250 | |
5c3a7db0 PZ |
2251 | err = module_enforce_rwx_sections(info->hdr, info->sechdrs, |
2252 | info->secstrings, info->mod); | |
2253 | if (err < 0) | |
2254 | return ERR_PTR(err); | |
2255 | ||
8d8022e8 RR |
2256 | /* We will do a special allocation for per-cpu sections later. */ |
2257 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 2258 | |
444d13ff JY |
2259 | /* |
2260 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
2261 | * layout_sections() can put it in the right place. | |
2262 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
2263 | */ | |
2264 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
2265 | if (ndx) |
2266 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
2267 | /* | |
2268 | * Mark the __jump_table section as ro_after_init as well: these data | |
2269 | * structures are never modified, with the exception of entries that | |
2270 | * refer to code in the __init section, which are annotated as such | |
2271 | * at module load time. | |
2272 | */ | |
2273 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
2274 | if (ndx) |
2275 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
2276 | ||
24b9f0d2 SS |
2277 | /* |
2278 | * Determine total sizes, and put offsets in sh_entsize. For now | |
2279 | * this is done generically; there doesn't appear to be any | |
2280 | * special cases for the architectures. | |
2281 | */ | |
81a0abd9 JY |
2282 | layout_sections(info->mod, info); |
2283 | layout_symtab(info->mod, info); | |
1da177e4 | 2284 | |
65b8a9b4 | 2285 | /* Allocate and move to the final place */ |
81a0abd9 | 2286 | err = move_module(info->mod, info); |
d913188c | 2287 | if (err) |
8d8022e8 | 2288 | return ERR_PTR(err); |
d913188c RR |
2289 | |
2290 | /* Module has been copied to its final place now: return it. */ | |
2291 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 2292 | kmemleak_load_module(mod, info); |
d913188c | 2293 | return mod; |
d913188c RR |
2294 | } |
2295 | ||
2296 | /* mod is no longer valid after this! */ | |
2297 | static void module_deallocate(struct module *mod, struct load_info *info) | |
2298 | { | |
d913188c | 2299 | percpu_modfree(mod); |
d453cded | 2300 | module_arch_freeing_init(mod); |
7523e4dc RR |
2301 | module_memfree(mod->init_layout.base); |
2302 | module_memfree(mod->core_layout.base); | |
d913188c RR |
2303 | } |
2304 | ||
74e08fcf JB |
2305 | int __weak module_finalize(const Elf_Ehdr *hdr, |
2306 | const Elf_Shdr *sechdrs, | |
2307 | struct module *me) | |
2308 | { | |
2309 | return 0; | |
2310 | } | |
2311 | ||
811d66a0 RR |
2312 | static int post_relocation(struct module *mod, const struct load_info *info) |
2313 | { | |
51f3d0f4 | 2314 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
2315 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
2316 | ||
2317 | /* Copy relocated percpu area over. */ | |
2318 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
2319 | info->sechdrs[info->index.pcpu].sh_size); | |
2320 | ||
51f3d0f4 | 2321 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
2322 | add_kallsyms(mod, info); |
2323 | ||
2324 | /* Arch-specific module finalizing. */ | |
2325 | return module_finalize(info->hdr, info->sechdrs, mod); | |
2326 | } | |
2327 | ||
9bb9c3be RR |
2328 | /* Is this module of this name done loading? No locks held. */ |
2329 | static bool finished_loading(const char *name) | |
2330 | { | |
2331 | struct module *mod; | |
2332 | bool ret; | |
2333 | ||
9cc019b8 PZ |
2334 | /* |
2335 | * The module_mutex should not be a heavily contended lock; | |
2336 | * if we get the occasional sleep here, we'll go an extra iteration | |
2337 | * in the wait_event_interruptible(), which is harmless. | |
2338 | */ | |
2339 | sched_annotate_sleep(); | |
9bb9c3be | 2340 | mutex_lock(&module_mutex); |
4f6de4d5 | 2341 | mod = find_module_all(name, strlen(name), true); |
6e6de3de | 2342 | ret = !mod || mod->state == MODULE_STATE_LIVE; |
9bb9c3be RR |
2343 | mutex_unlock(&module_mutex); |
2344 | ||
2345 | return ret; | |
2346 | } | |
2347 | ||
34e1169d KC |
2348 | /* Call module constructors. */ |
2349 | static void do_mod_ctors(struct module *mod) | |
2350 | { | |
2351 | #ifdef CONFIG_CONSTRUCTORS | |
2352 | unsigned long i; | |
2353 | ||
2354 | for (i = 0; i < mod->num_ctors; i++) | |
2355 | mod->ctors[i](); | |
2356 | #endif | |
2357 | } | |
2358 | ||
c7496379 RR |
2359 | /* For freeing module_init on success, in case kallsyms traversing */ |
2360 | struct mod_initfree { | |
1a7b7d92 | 2361 | struct llist_node node; |
c7496379 RR |
2362 | void *module_init; |
2363 | }; | |
2364 | ||
1a7b7d92 | 2365 | static void do_free_init(struct work_struct *w) |
c7496379 | 2366 | { |
1a7b7d92 RE |
2367 | struct llist_node *pos, *n, *list; |
2368 | struct mod_initfree *initfree; | |
2369 | ||
2370 | list = llist_del_all(&init_free_list); | |
2371 | ||
2372 | synchronize_rcu(); | |
2373 | ||
2374 | llist_for_each_safe(pos, n, list) { | |
2375 | initfree = container_of(pos, struct mod_initfree, node); | |
2376 | module_memfree(initfree->module_init); | |
2377 | kfree(initfree); | |
2378 | } | |
c7496379 RR |
2379 | } |
2380 | ||
be02a186 JK |
2381 | /* |
2382 | * This is where the real work happens. | |
2383 | * | |
2384 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
2385 | * helper command 'lx-symbols'. | |
2386 | */ | |
2387 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
2388 | { |
2389 | int ret = 0; | |
c7496379 RR |
2390 | struct mod_initfree *freeinit; |
2391 | ||
2392 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
2393 | if (!freeinit) { | |
2394 | ret = -ENOMEM; | |
2395 | goto fail; | |
2396 | } | |
7523e4dc | 2397 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 2398 | |
34e1169d KC |
2399 | do_mod_ctors(mod); |
2400 | /* Start the module */ | |
2401 | if (mod->init != NULL) | |
2402 | ret = do_one_initcall(mod->init); | |
2403 | if (ret < 0) { | |
c7496379 | 2404 | goto fail_free_freeinit; |
34e1169d KC |
2405 | } |
2406 | if (ret > 0) { | |
bddb12b3 AM |
2407 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
2408 | "follow 0/-E convention\n" | |
2409 | "%s: loading module anyway...\n", | |
2410 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
2411 | dump_stack(); |
2412 | } | |
2413 | ||
2414 | /* Now it's a first class citizen! */ | |
2415 | mod->state = MODULE_STATE_LIVE; | |
2416 | blocking_notifier_call_chain(&module_notify_list, | |
2417 | MODULE_STATE_LIVE, mod); | |
2418 | ||
38dc717e JY |
2419 | /* Delay uevent until module has finished its init routine */ |
2420 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); | |
2421 | ||
774a1221 TH |
2422 | /* |
2423 | * We need to finish all async code before the module init sequence | |
67d6212a IP |
2424 | * is done. This has potential to deadlock if synchronous module |
2425 | * loading is requested from async (which is not allowed!). | |
774a1221 | 2426 | * |
67d6212a IP |
2427 | * See commit 0fdff3ec6d87 ("async, kmod: warn on synchronous |
2428 | * request_module() from async workers") for more details. | |
774a1221 | 2429 | */ |
67d6212a | 2430 | if (!mod->async_probe_requested) |
774a1221 | 2431 | async_synchronize_full(); |
34e1169d | 2432 | |
aba4b5c2 | 2433 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 2434 | mod->init_layout.size); |
34e1169d KC |
2435 | mutex_lock(&module_mutex); |
2436 | /* Drop initial reference. */ | |
2437 | module_put(mod); | |
2438 | trim_init_extable(mod); | |
2439 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
2440 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
2441 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 2442 | #endif |
444d13ff | 2443 | module_enable_ro(mod, true); |
93c2e105 | 2444 | mod_tree_remove_init(mod); |
d453cded | 2445 | module_arch_freeing_init(mod); |
7523e4dc RR |
2446 | mod->init_layout.base = NULL; |
2447 | mod->init_layout.size = 0; | |
2448 | mod->init_layout.ro_size = 0; | |
444d13ff | 2449 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 2450 | mod->init_layout.text_size = 0; |
607c543f AN |
2451 | #ifdef CONFIG_DEBUG_INFO_BTF_MODULES |
2452 | /* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */ | |
2453 | mod->btf_data = NULL; | |
607c543f | 2454 | #endif |
c7496379 RR |
2455 | /* |
2456 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 2457 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 2458 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
2459 | * path. module_memfree() cannot be called in an interrupt, so do the |
2460 | * work and call synchronize_rcu() in a work queue. | |
2461 | * | |
ae646f0b JH |
2462 | * Note that module_alloc() on most architectures creates W+X page |
2463 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
2464 | * code such as mark_rodata_ro() which depends on those mappings to | |
2465 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 2466 | * rcu_barrier() |
c7496379 | 2467 | */ |
1a7b7d92 RE |
2468 | if (llist_add(&freeinit->node, &init_free_list)) |
2469 | schedule_work(&init_free_wq); | |
2470 | ||
34e1169d KC |
2471 | mutex_unlock(&module_mutex); |
2472 | wake_up_all(&module_wq); | |
2473 | ||
2474 | return 0; | |
c7496379 RR |
2475 | |
2476 | fail_free_freeinit: | |
2477 | kfree(freeinit); | |
2478 | fail: | |
2479 | /* Try to protect us from buggy refcounters. */ | |
2480 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 2481 | synchronize_rcu(); |
c7496379 RR |
2482 | module_put(mod); |
2483 | blocking_notifier_call_chain(&module_notify_list, | |
2484 | MODULE_STATE_GOING, mod); | |
7e545d6e | 2485 | klp_module_going(mod); |
7dcd182b | 2486 | ftrace_release_mod(mod); |
c7496379 RR |
2487 | free_module(mod); |
2488 | wake_up_all(&module_wq); | |
2489 | return ret; | |
34e1169d KC |
2490 | } |
2491 | ||
2492 | static int may_init_module(void) | |
2493 | { | |
2494 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
2495 | return -EPERM; | |
2496 | ||
2497 | return 0; | |
2498 | } | |
2499 | ||
a3535c7e RR |
2500 | /* |
2501 | * We try to place it in the list now to make sure it's unique before | |
2502 | * we dedicate too many resources. In particular, temporary percpu | |
2503 | * memory exhaustion. | |
2504 | */ | |
2505 | static int add_unformed_module(struct module *mod) | |
2506 | { | |
2507 | int err; | |
2508 | struct module *old; | |
2509 | ||
2510 | mod->state = MODULE_STATE_UNFORMED; | |
2511 | ||
2512 | again: | |
2513 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
2514 | old = find_module_all(mod->name, strlen(mod->name), true); |
2515 | if (old != NULL) { | |
6e6de3de | 2516 | if (old->state != MODULE_STATE_LIVE) { |
a3535c7e RR |
2517 | /* Wait in case it fails to load. */ |
2518 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
2519 | err = wait_event_interruptible(module_wq, |
2520 | finished_loading(mod->name)); | |
a3535c7e RR |
2521 | if (err) |
2522 | goto out_unlocked; | |
2523 | goto again; | |
2524 | } | |
2525 | err = -EEXIST; | |
2526 | goto out; | |
2527 | } | |
4f666546 | 2528 | mod_update_bounds(mod); |
a3535c7e | 2529 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 2530 | mod_tree_insert(mod); |
a3535c7e RR |
2531 | err = 0; |
2532 | ||
2533 | out: | |
2534 | mutex_unlock(&module_mutex); | |
2535 | out_unlocked: | |
2536 | return err; | |
2537 | } | |
2538 | ||
2539 | static int complete_formation(struct module *mod, struct load_info *info) | |
2540 | { | |
2541 | int err; | |
2542 | ||
2543 | mutex_lock(&module_mutex); | |
2544 | ||
2545 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 2546 | err = verify_exported_symbols(mod); |
a3535c7e RR |
2547 | if (err < 0) |
2548 | goto out; | |
2549 | ||
2550 | /* This relies on module_mutex for list integrity. */ | |
2551 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
2552 | ||
444d13ff | 2553 | module_enable_ro(mod, false); |
85c898db | 2554 | module_enable_nx(mod); |
af742623 | 2555 | module_enable_x(mod); |
4982223e | 2556 | |
24b9f0d2 SS |
2557 | /* |
2558 | * Mark state as coming so strong_try_module_get() ignores us, | |
2559 | * but kallsyms etc. can see us. | |
2560 | */ | |
a3535c7e | 2561 | mod->state = MODULE_STATE_COMING; |
4982223e RR |
2562 | mutex_unlock(&module_mutex); |
2563 | ||
4982223e | 2564 | return 0; |
a3535c7e RR |
2565 | |
2566 | out: | |
2567 | mutex_unlock(&module_mutex); | |
2568 | return err; | |
2569 | } | |
2570 | ||
4c973d16 JY |
2571 | static int prepare_coming_module(struct module *mod) |
2572 | { | |
7e545d6e JY |
2573 | int err; |
2574 | ||
4c973d16 | 2575 | ftrace_module_enable(mod); |
7e545d6e JY |
2576 | err = klp_module_coming(mod); |
2577 | if (err) | |
2578 | return err; | |
2579 | ||
59cc8e0a PZ |
2580 | err = blocking_notifier_call_chain_robust(&module_notify_list, |
2581 | MODULE_STATE_COMING, MODULE_STATE_GOING, mod); | |
2582 | err = notifier_to_errno(err); | |
2583 | if (err) | |
2584 | klp_module_going(mod); | |
2585 | ||
2586 | return err; | |
4c973d16 JY |
2587 | } |
2588 | ||
ecc86170 LR |
2589 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
2590 | void *arg) | |
54041d8a | 2591 | { |
f2411da7 LR |
2592 | struct module *mod = arg; |
2593 | int ret; | |
2594 | ||
2595 | if (strcmp(param, "async_probe") == 0) { | |
2596 | mod->async_probe_requested = true; | |
2597 | return 0; | |
2598 | } | |
2599 | ||
6da0b565 | 2600 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 2601 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
2602 | if (ret != 0) |
2603 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
2604 | return 0; |
2605 | } | |
2606 | ||
cf68fffb ST |
2607 | static void cfi_init(struct module *mod); |
2608 | ||
24b9f0d2 SS |
2609 | /* |
2610 | * Allocate and load the module: note that size of section 0 is always | |
2611 | * zero, and we rely on this for optional sections. | |
2612 | */ | |
2f3238ae RR |
2613 | static int load_module(struct load_info *info, const char __user *uargs, |
2614 | int flags) | |
d913188c | 2615 | { |
a3535c7e | 2616 | struct module *mod; |
5fdc7db6 | 2617 | long err = 0; |
51e158c1 | 2618 | char *after_dashes; |
d913188c | 2619 | |
ec2a2959 FL |
2620 | /* |
2621 | * Do the signature check (if any) first. All that | |
2622 | * the signature check needs is info->len, it does | |
2623 | * not need any of the section info. That can be | |
2624 | * set up later. This will minimize the chances | |
2625 | * of a corrupt module causing problems before | |
2626 | * we even get to the signature check. | |
2627 | * | |
2628 | * The check will also adjust info->len by stripping | |
2629 | * off the sig length at the end of the module, making | |
2630 | * checks against info->len more correct. | |
2631 | */ | |
2632 | err = module_sig_check(info, flags); | |
2633 | if (err) | |
2634 | goto free_copy; | |
2635 | ||
2636 | /* | |
2637 | * Do basic sanity checks against the ELF header and | |
2638 | * sections. | |
2639 | */ | |
2640 | err = elf_validity_check(info); | |
7fd982f3 | 2641 | if (err) |
5fdc7db6 JY |
2642 | goto free_copy; |
2643 | ||
ec2a2959 FL |
2644 | /* |
2645 | * Everything checks out, so set up the section info | |
2646 | * in the info structure. | |
2647 | */ | |
5fdc7db6 JY |
2648 | err = setup_load_info(info, flags); |
2649 | if (err) | |
2650 | goto free_copy; | |
2651 | ||
ec2a2959 FL |
2652 | /* |
2653 | * Now that we know we have the correct module name, check | |
2654 | * if it's blacklisted. | |
2655 | */ | |
5fdc7db6 JY |
2656 | if (blacklisted(info->name)) { |
2657 | err = -EPERM; | |
14721add | 2658 | pr_err("Module %s is blacklisted\n", info->name); |
5fdc7db6 JY |
2659 | goto free_copy; |
2660 | } | |
2661 | ||
5fdc7db6 | 2662 | err = rewrite_section_headers(info, flags); |
d913188c | 2663 | if (err) |
34e1169d | 2664 | goto free_copy; |
d913188c | 2665 | |
5fdc7db6 JY |
2666 | /* Check module struct version now, before we try to use module. */ |
2667 | if (!check_modstruct_version(info, info->mod)) { | |
2668 | err = -ENOEXEC; | |
2669 | goto free_copy; | |
2670 | } | |
2671 | ||
d913188c | 2672 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 2673 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
2674 | if (IS_ERR(mod)) { |
2675 | err = PTR_ERR(mod); | |
d913188c | 2676 | goto free_copy; |
1da177e4 | 2677 | } |
1da177e4 | 2678 | |
ca86cad7 RGB |
2679 | audit_log_kern_module(mod->name); |
2680 | ||
a3535c7e RR |
2681 | /* Reserve our place in the list. */ |
2682 | err = add_unformed_module(mod); | |
2683 | if (err) | |
1fb9341a | 2684 | goto free_module; |
1fb9341a | 2685 | |
106a4ee2 | 2686 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2687 | mod->sig_ok = info->sig_ok; |
64748a2c | 2688 | if (!mod->sig_ok) { |
bddb12b3 | 2689 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 2690 | "and/or required key missing - tainting " |
bddb12b3 | 2691 | "kernel\n", mod->name); |
66cc69e3 | 2692 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 2693 | } |
106a4ee2 RR |
2694 | #endif |
2695 | ||
8d8022e8 | 2696 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 2697 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
2698 | if (err) |
2699 | goto unlink_mod; | |
2700 | ||
49668688 | 2701 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
2702 | err = module_unload_init(mod); |
2703 | if (err) | |
1fb9341a | 2704 | goto unlink_mod; |
1da177e4 | 2705 | |
cf2fde7b | 2706 | init_param_lock(mod); |
b51d23e4 | 2707 | |
24b9f0d2 SS |
2708 | /* |
2709 | * Now we've got everything in the final locations, we can | |
2710 | * find optional sections. | |
2711 | */ | |
eb3057df FH |
2712 | err = find_module_sections(mod, info); |
2713 | if (err) | |
2714 | goto free_unload; | |
9b37ccfc | 2715 | |
49668688 | 2716 | err = check_module_license_and_versions(mod); |
22e268eb RR |
2717 | if (err) |
2718 | goto free_unload; | |
9841d61d | 2719 | |
c988d2b2 | 2720 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 2721 | setup_modinfo(mod, info); |
c988d2b2 | 2722 | |
1da177e4 | 2723 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 2724 | err = simplify_symbols(mod, info); |
1da177e4 | 2725 | if (err < 0) |
d913188c | 2726 | goto free_modinfo; |
1da177e4 | 2727 | |
34e1169d | 2728 | err = apply_relocations(mod, info); |
22e268eb | 2729 | if (err < 0) |
d913188c | 2730 | goto free_modinfo; |
1da177e4 | 2731 | |
34e1169d | 2732 | err = post_relocation(mod, info); |
1da177e4 | 2733 | if (err < 0) |
d913188c | 2734 | goto free_modinfo; |
1da177e4 | 2735 | |
22e268eb | 2736 | flush_module_icache(mod); |
378bac82 | 2737 | |
cf68fffb ST |
2738 | /* Setup CFI for the module. */ |
2739 | cfi_init(mod); | |
2740 | ||
6526c534 RR |
2741 | /* Now copy in args */ |
2742 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
2743 | if (IS_ERR(mod->args)) { | |
2744 | err = PTR_ERR(mod->args); | |
2745 | goto free_arch_cleanup; | |
2746 | } | |
8d3b33f6 | 2747 | |
9294523e | 2748 | init_build_id(mod, info); |
52796312 | 2749 | dynamic_debug_setup(mod, info->debug, info->num_debug); |
ff49d74a | 2750 | |
a949ae56 SRRH |
2751 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
2752 | ftrace_module_init(mod); | |
2753 | ||
a3535c7e RR |
2754 | /* Finally it's fully formed, ready to start executing. */ |
2755 | err = complete_formation(mod, info); | |
2756 | if (err) | |
1fb9341a | 2757 | goto ddebug_cleanup; |
be593f4c | 2758 | |
4c973d16 JY |
2759 | err = prepare_coming_module(mod); |
2760 | if (err) | |
2761 | goto bug_cleanup; | |
2762 | ||
51f3d0f4 | 2763 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 2764 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 2765 | -32768, 32767, mod, |
ecc86170 | 2766 | unknown_module_param_cb); |
51e158c1 RR |
2767 | if (IS_ERR(after_dashes)) { |
2768 | err = PTR_ERR(after_dashes); | |
4c973d16 | 2769 | goto coming_cleanup; |
51e158c1 RR |
2770 | } else if (after_dashes) { |
2771 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
2772 | mod->name, after_dashes); | |
2773 | } | |
1da177e4 | 2774 | |
ca86cad7 | 2775 | /* Link in to sysfs. */ |
34e1169d | 2776 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 2777 | if (err < 0) |
4c973d16 | 2778 | goto coming_cleanup; |
80a3d1bb | 2779 | |
1ce15ef4 JY |
2780 | if (is_livepatch_module(mod)) { |
2781 | err = copy_module_elf(mod, info); | |
2782 | if (err < 0) | |
2783 | goto sysfs_cleanup; | |
2784 | } | |
2785 | ||
48fd1188 | 2786 | /* Get rid of temporary copy. */ |
b1ae6dc4 | 2787 | free_copy(info, flags); |
1da177e4 LT |
2788 | |
2789 | /* Done! */ | |
51f3d0f4 | 2790 | trace_module_load(mod); |
34e1169d KC |
2791 | |
2792 | return do_init_module(mod); | |
1da177e4 | 2793 | |
1ce15ef4 JY |
2794 | sysfs_cleanup: |
2795 | mod_sysfs_teardown(mod); | |
4c973d16 | 2796 | coming_cleanup: |
885a78d4 | 2797 | mod->state = MODULE_STATE_GOING; |
a5544880 | 2798 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
2799 | blocking_notifier_call_chain(&module_notify_list, |
2800 | MODULE_STATE_GOING, mod); | |
7e545d6e | 2801 | klp_module_going(mod); |
1fb9341a | 2802 | bug_cleanup: |
5e8ed280 | 2803 | mod->state = MODULE_STATE_GOING; |
1fb9341a | 2804 | /* module_bug_cleanup needs module_mutex protection */ |
75676500 | 2805 | mutex_lock(&module_mutex); |
5336377d | 2806 | module_bug_cleanup(mod); |
ee61abb3 | 2807 | mutex_unlock(&module_mutex); |
ff7e0055 | 2808 | |
a3535c7e | 2809 | ddebug_cleanup: |
1323eac7 | 2810 | ftrace_release_mod(mod); |
52796312 | 2811 | dynamic_debug_remove(mod, info->debug); |
cb2f5536 | 2812 | synchronize_rcu(); |
6526c534 RR |
2813 | kfree(mod->args); |
2814 | free_arch_cleanup: | |
cf68fffb | 2815 | cfi_cleanup(mod); |
1da177e4 | 2816 | module_arch_cleanup(mod); |
d913188c | 2817 | free_modinfo: |
a263f776 | 2818 | free_modinfo(mod); |
22e268eb | 2819 | free_unload: |
1da177e4 | 2820 | module_unload_free(mod); |
1fb9341a RR |
2821 | unlink_mod: |
2822 | mutex_lock(&module_mutex); | |
2823 | /* Unlink carefully: kallsyms could be walking list. */ | |
2824 | list_del_rcu(&mod->list); | |
758556bd | 2825 | mod_tree_remove(mod); |
1fb9341a | 2826 | wake_up_all(&module_wq); |
0be964be | 2827 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 2828 | synchronize_rcu(); |
1fb9341a | 2829 | mutex_unlock(&module_mutex); |
d913188c | 2830 | free_module: |
35a9393c | 2831 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 2832 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 2833 | |
34e1169d | 2834 | module_deallocate(mod, info); |
d913188c | 2835 | free_copy: |
b1ae6dc4 | 2836 | free_copy(info, flags); |
34e1169d | 2837 | return err; |
b99b87f7 PO |
2838 | } |
2839 | ||
17da2bd9 HC |
2840 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2841 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 2842 | { |
34e1169d KC |
2843 | int err; |
2844 | struct load_info info = { }; | |
1da177e4 | 2845 | |
34e1169d KC |
2846 | err = may_init_module(); |
2847 | if (err) | |
2848 | return err; | |
1da177e4 | 2849 | |
34e1169d KC |
2850 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
2851 | umod, len, uargs); | |
1da177e4 | 2852 | |
34e1169d KC |
2853 | err = copy_module_from_user(umod, len, &info); |
2854 | if (err) | |
2855 | return err; | |
1da177e4 | 2856 | |
2f3238ae | 2857 | return load_module(&info, uargs, 0); |
34e1169d | 2858 | } |
94462ad3 | 2859 | |
2f3238ae | 2860 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 2861 | { |
34e1169d | 2862 | struct load_info info = { }; |
b1ae6dc4 DT |
2863 | void *buf = NULL; |
2864 | int len; | |
a1db7420 | 2865 | int err; |
94462ad3 | 2866 | |
34e1169d KC |
2867 | err = may_init_module(); |
2868 | if (err) | |
2869 | return err; | |
1da177e4 | 2870 | |
2f3238ae | 2871 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 2872 | |
2f3238ae | 2873 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
b1ae6dc4 DT |
2874 | |MODULE_INIT_IGNORE_VERMAGIC |
2875 | |MODULE_INIT_COMPRESSED_FILE)) | |
2f3238ae | 2876 | return -EINVAL; |
d6de2c80 | 2877 | |
b1ae6dc4 | 2878 | len = kernel_read_file_from_fd(fd, 0, &buf, INT_MAX, NULL, |
a1db7420 | 2879 | READING_MODULE); |
b1ae6dc4 DT |
2880 | if (len < 0) |
2881 | return len; | |
2882 | ||
2883 | if (flags & MODULE_INIT_COMPRESSED_FILE) { | |
2884 | err = module_decompress(&info, buf, len); | |
2885 | vfree(buf); /* compressed data is no longer needed */ | |
2886 | if (err) | |
2887 | return err; | |
2888 | } else { | |
2889 | info.hdr = buf; | |
2890 | info.len = len; | |
2891 | } | |
1da177e4 | 2892 | |
2f3238ae | 2893 | return load_module(&info, uargs, flags); |
1da177e4 LT |
2894 | } |
2895 | ||
2896 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2897 | { | |
2898 | return ((void *)addr >= start && (void *)addr < start + size); | |
2899 | } | |
2900 | ||
cf68fffb ST |
2901 | static void cfi_init(struct module *mod) |
2902 | { | |
2903 | #ifdef CONFIG_CFI_CLANG | |
2904 | initcall_t *init; | |
2905 | exitcall_t *exit; | |
2906 | ||
2907 | rcu_read_lock_sched(); | |
2908 | mod->cfi_check = (cfi_check_fn) | |
2909 | find_kallsyms_symbol_value(mod, "__cfi_check"); | |
2910 | init = (initcall_t *) | |
2911 | find_kallsyms_symbol_value(mod, "__cfi_jt_init_module"); | |
2912 | exit = (exitcall_t *) | |
2913 | find_kallsyms_symbol_value(mod, "__cfi_jt_cleanup_module"); | |
2914 | rcu_read_unlock_sched(); | |
2915 | ||
2916 | /* Fix init/exit functions to point to the CFI jump table */ | |
2917 | if (init) | |
2918 | mod->init = *init; | |
0d67e332 | 2919 | #ifdef CONFIG_MODULE_UNLOAD |
cf68fffb ST |
2920 | if (exit) |
2921 | mod->exit = *exit; | |
0d67e332 | 2922 | #endif |
cf68fffb ST |
2923 | |
2924 | cfi_module_add(mod, module_addr_min); | |
2925 | #endif | |
2926 | } | |
2927 | ||
2928 | static void cfi_cleanup(struct module *mod) | |
2929 | { | |
2930 | #ifdef CONFIG_CFI_CLANG | |
2931 | cfi_module_remove(mod, module_addr_min); | |
2932 | #endif | |
2933 | } | |
2934 | ||
7fd8329b | 2935 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ |
0ffc40f6 | 2936 | char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
2937 | { |
2938 | int bx = 0; | |
2939 | ||
0d21b0e3 | 2940 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
2941 | if (mod->taints || |
2942 | mod->state == MODULE_STATE_GOING || | |
2943 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 2944 | buf[bx++] = '('; |
cca3e707 | 2945 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
2946 | /* Show a - for module-is-being-unloaded */ |
2947 | if (mod->state == MODULE_STATE_GOING) | |
2948 | buf[bx++] = '-'; | |
2949 | /* Show a + for module-is-being-loaded */ | |
2950 | if (mod->state == MODULE_STATE_COMING) | |
2951 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
2952 | buf[bx++] = ')'; |
2953 | } | |
2954 | buf[bx] = '\0'; | |
2955 | ||
2956 | return buf; | |
2957 | } | |
2958 | ||
1da177e4 LT |
2959 | /* Given an address, look for it in the module exception tables. */ |
2960 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
2961 | { | |
1da177e4 LT |
2962 | const struct exception_table_entry *e = NULL; |
2963 | struct module *mod; | |
2964 | ||
24da1cbf | 2965 | preempt_disable(); |
5ff22646 PZ |
2966 | mod = __module_address(addr); |
2967 | if (!mod) | |
2968 | goto out; | |
22a8bdeb | 2969 | |
5ff22646 PZ |
2970 | if (!mod->num_exentries) |
2971 | goto out; | |
2972 | ||
2973 | e = search_extable(mod->extable, | |
a94c33dd | 2974 | mod->num_exentries, |
5ff22646 PZ |
2975 | addr); |
2976 | out: | |
24da1cbf | 2977 | preempt_enable(); |
1da177e4 | 2978 | |
5ff22646 PZ |
2979 | /* |
2980 | * Now, if we found one, we are running inside it now, hence | |
2981 | * we cannot unload the module, hence no refcnt needed. | |
2982 | */ | |
1da177e4 LT |
2983 | return e; |
2984 | } | |
2985 | ||
2541743e SS |
2986 | /** |
2987 | * is_module_address() - is this address inside a module? | |
e610499e RR |
2988 | * @addr: the address to check. |
2989 | * | |
2990 | * See is_module_text_address() if you simply want to see if the address | |
2991 | * is code (not data). | |
4d435f9d | 2992 | */ |
e610499e | 2993 | bool is_module_address(unsigned long addr) |
4d435f9d | 2994 | { |
e610499e | 2995 | bool ret; |
4d435f9d | 2996 | |
24da1cbf | 2997 | preempt_disable(); |
e610499e | 2998 | ret = __module_address(addr) != NULL; |
24da1cbf | 2999 | preempt_enable(); |
4d435f9d | 3000 | |
e610499e | 3001 | return ret; |
4d435f9d IM |
3002 | } |
3003 | ||
2541743e SS |
3004 | /** |
3005 | * __module_address() - get the module which contains an address. | |
e610499e RR |
3006 | * @addr: the address. |
3007 | * | |
3008 | * Must be called with preempt disabled or module mutex held so that | |
3009 | * module doesn't get freed during this. | |
3010 | */ | |
714f83d5 | 3011 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3012 | { |
3013 | struct module *mod; | |
3014 | ||
3a642e99 RR |
3015 | if (addr < module_addr_min || addr > module_addr_max) |
3016 | return NULL; | |
3017 | ||
0be964be PZ |
3018 | module_assert_mutex_or_preempt(); |
3019 | ||
6c9692e2 | 3020 | mod = mod_find(addr); |
93c2e105 PZ |
3021 | if (mod) { |
3022 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 3023 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 3024 | mod = NULL; |
0d21b0e3 | 3025 | } |
93c2e105 | 3026 | return mod; |
1da177e4 LT |
3027 | } |
3028 | ||
2541743e SS |
3029 | /** |
3030 | * is_module_text_address() - is this address inside module code? | |
e610499e RR |
3031 | * @addr: the address to check. |
3032 | * | |
3033 | * See is_module_address() if you simply want to see if the address is | |
3034 | * anywhere in a module. See kernel_text_address() for testing if an | |
3035 | * address corresponds to kernel or module code. | |
3036 | */ | |
3037 | bool is_module_text_address(unsigned long addr) | |
3038 | { | |
3039 | bool ret; | |
3040 | ||
3041 | preempt_disable(); | |
3042 | ret = __module_text_address(addr) != NULL; | |
3043 | preempt_enable(); | |
3044 | ||
3045 | return ret; | |
3046 | } | |
3047 | ||
2541743e SS |
3048 | /** |
3049 | * __module_text_address() - get the module whose code contains an address. | |
e610499e RR |
3050 | * @addr: the address. |
3051 | * | |
3052 | * Must be called with preempt disabled or module mutex held so that | |
3053 | * module doesn't get freed during this. | |
3054 | */ | |
3055 | struct module *__module_text_address(unsigned long addr) | |
3056 | { | |
3057 | struct module *mod = __module_address(addr); | |
3058 | if (mod) { | |
3059 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
3060 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
3061 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
3062 | mod = NULL; |
3063 | } | |
3064 | return mod; | |
3065 | } | |
3066 | ||
1da177e4 LT |
3067 | /* Don't grab lock, we're oopsing. */ |
3068 | void print_modules(void) | |
3069 | { | |
3070 | struct module *mod; | |
7fd8329b | 3071 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 3072 | |
b231125a | 3073 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3074 | /* Most callers should already have preempt disabled, but make sure */ |
3075 | preempt_disable(); | |
0d21b0e3 RR |
3076 | list_for_each_entry_rcu(mod, &modules, list) { |
3077 | if (mod->state == MODULE_STATE_UNFORMED) | |
3078 | continue; | |
27bba4d6 | 3079 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 3080 | } |
d72b3751 | 3081 | preempt_enable(); |
e14af7ee | 3082 | if (last_unloaded_module[0]) |
27bba4d6 JS |
3083 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
3084 | pr_cont("\n"); | |
1da177e4 | 3085 | } |