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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> |
89245600 | 56 | #include <linux/cfi.h> |
2f3238ae | 57 | #include <uapi/linux/module.h> |
cfc1d277 | 58 | #include "internal.h" |
1da177e4 | 59 | |
7ead8b83 LZ |
60 | #define CREATE_TRACE_POINTS |
61 | #include <trace/events/module.h> | |
62 | ||
75676500 RR |
63 | /* |
64 | * Mutex protects: | |
65 | * 1) List of modules (also safely readable with preempt_disable), | |
66 | * 2) module_use links, | |
55ce556d | 67 | * 3) mod_tree.addr_min/mod_tree.addr_max. |
24b9f0d2 SS |
68 | * (delete and add uses RCU list operations). |
69 | */ | |
8ab4ed08 AT |
70 | DEFINE_MUTEX(module_mutex); |
71 | LIST_HEAD(modules); | |
67fc4e0c | 72 | |
1a7b7d92 | 73 | /* Work queue for freeing init sections in success case */ |
fdf09ab8 DJ |
74 | static void do_free_init(struct work_struct *w); |
75 | static DECLARE_WORK(init_free_wq, do_free_init); | |
76 | static LLIST_HEAD(init_free_list); | |
1a7b7d92 | 77 | |
58d208de | 78 | struct mod_tree_root mod_tree __cacheline_aligned = { |
4f666546 | 79 | .addr_min = -1UL, |
106a4ee2 | 80 | }; |
106a4ee2 | 81 | |
01dc0386 CL |
82 | #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC |
83 | struct mod_tree_root mod_data_tree __cacheline_aligned = { | |
84 | .addr_min = -1UL, | |
85 | }; | |
86 | #endif | |
87 | ||
47889798 AT |
88 | struct symsearch { |
89 | const struct kernel_symbol *start, *stop; | |
90 | const s32 *crcs; | |
91 | enum mod_license license; | |
92 | }; | |
93 | ||
4f666546 PZ |
94 | /* |
95 | * Bounds of module text, for speeding up __module_address. | |
96 | * Protected by module_mutex. | |
97 | */ | |
446d5566 | 98 | static void __mod_update_bounds(void *base, unsigned int size, struct mod_tree_root *tree) |
4f666546 PZ |
99 | { |
100 | unsigned long min = (unsigned long)base; | |
101 | unsigned long max = min + size; | |
102 | ||
446d5566 CL |
103 | if (min < tree->addr_min) |
104 | tree->addr_min = min; | |
105 | if (max > tree->addr_max) | |
106 | tree->addr_max = max; | |
4f666546 PZ |
107 | } |
108 | ||
109 | static void mod_update_bounds(struct module *mod) | |
110 | { | |
446d5566 | 111 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size, &mod_tree); |
7523e4dc | 112 | if (mod->init_layout.size) |
446d5566 | 113 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size, &mod_tree); |
01dc0386 CL |
114 | #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC |
115 | __mod_update_bounds(mod->data_layout.base, mod->data_layout.size, &mod_data_tree); | |
116 | #endif | |
4f666546 PZ |
117 | } |
118 | ||
19e4529e | 119 | /* Block module loading/unloading? */ |
ecc726f1 | 120 | int modules_disabled; |
02608bef | 121 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 122 | |
c9a3ba55 RR |
123 | /* Waiting for a module to finish initializing? */ |
124 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
125 | ||
e041c683 | 126 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 127 | |
6da0b565 | 128 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 129 | { |
e041c683 | 130 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
131 | } |
132 | EXPORT_SYMBOL(register_module_notifier); | |
133 | ||
6da0b565 | 134 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 135 | { |
e041c683 | 136 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
137 | } |
138 | EXPORT_SYMBOL(unregister_module_notifier); | |
139 | ||
71d9f507 MB |
140 | /* |
141 | * We require a truly strong try_module_get(): 0 means success. | |
142 | * Otherwise an error is returned due to ongoing or failed | |
143 | * initialization etc. | |
144 | */ | |
1da177e4 LT |
145 | static inline int strong_try_module_get(struct module *mod) |
146 | { | |
0d21b0e3 | 147 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 148 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
149 | return -EBUSY; |
150 | if (try_module_get(mod)) | |
1da177e4 | 151 | return 0; |
c9a3ba55 RR |
152 | else |
153 | return -ENOENT; | |
1da177e4 LT |
154 | } |
155 | ||
373d4d09 RR |
156 | static inline void add_taint_module(struct module *mod, unsigned flag, |
157 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 158 | { |
373d4d09 | 159 | add_taint(flag, lockdep_ok); |
7fd8329b | 160 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
161 | } |
162 | ||
02a3e59a RD |
163 | /* |
164 | * A thread that wants to hold a reference to a module only while it | |
f49169c9 | 165 | * is running can call this to safely exit. |
1da177e4 | 166 | */ |
ca3574bd | 167 | void __noreturn __module_put_and_kthread_exit(struct module *mod, long code) |
1da177e4 LT |
168 | { |
169 | module_put(mod); | |
ca3574bd | 170 | kthread_exit(code); |
1da177e4 | 171 | } |
ca3574bd | 172 | EXPORT_SYMBOL(__module_put_and_kthread_exit); |
22a8bdeb | 173 | |
1da177e4 | 174 | /* Find a module section: 0 means not found. */ |
49668688 | 175 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
176 | { |
177 | unsigned int i; | |
178 | ||
49668688 RR |
179 | for (i = 1; i < info->hdr->e_shnum; i++) { |
180 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 181 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
182 | if ((shdr->sh_flags & SHF_ALLOC) |
183 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 184 | return i; |
49668688 | 185 | } |
1da177e4 LT |
186 | return 0; |
187 | } | |
188 | ||
5e458cc0 | 189 | /* Find a module section, or NULL. */ |
49668688 | 190 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
191 | { |
192 | /* Section 0 has sh_addr 0. */ | |
49668688 | 193 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
194 | } |
195 | ||
196 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 197 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
198 | const char *name, |
199 | size_t object_size, | |
200 | unsigned int *num) | |
201 | { | |
49668688 | 202 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
203 | |
204 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
205 | *num = info->sechdrs[sec].sh_size / object_size; |
206 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
207 | } |
208 | ||
36e68442 AN |
209 | /* Find a module section: 0 means not found. Ignores SHF_ALLOC flag. */ |
210 | static unsigned int find_any_sec(const struct load_info *info, const char *name) | |
211 | { | |
212 | unsigned int i; | |
213 | ||
214 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
215 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
216 | if (strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
217 | return i; | |
218 | } | |
219 | return 0; | |
220 | } | |
221 | ||
222 | /* | |
223 | * Find a module section, or NULL. Fill in number of "objects" in section. | |
224 | * Ignores SHF_ALLOC flag. | |
225 | */ | |
226 | static __maybe_unused void *any_section_objs(const struct load_info *info, | |
227 | const char *name, | |
228 | size_t object_size, | |
229 | unsigned int *num) | |
230 | { | |
231 | unsigned int sec = find_any_sec(info, name); | |
232 | ||
233 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
234 | *num = info->sechdrs[sec].sh_size / object_size; | |
235 | return (void *)info->sechdrs[sec].sh_addr; | |
236 | } | |
237 | ||
1da177e4 LT |
238 | #ifndef CONFIG_MODVERSIONS |
239 | #define symversion(base, idx) NULL | |
240 | #else | |
f83ca9fe | 241 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
242 | #endif |
243 | ||
7290d580 AB |
244 | static const char *kernel_symbol_name(const struct kernel_symbol *sym) |
245 | { | |
246 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
247 | return offset_to_ptr(&sym->name_offset); | |
248 | #else | |
249 | return sym->name; | |
250 | #endif | |
251 | } | |
252 | ||
8651ec01 MM |
253 | static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
254 | { | |
255 | #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS | |
069e1c07 WD |
256 | if (!sym->namespace_offset) |
257 | return NULL; | |
8651ec01 MM |
258 | return offset_to_ptr(&sym->namespace_offset); |
259 | #else | |
260 | return sym->namespace; | |
261 | #endif | |
262 | } | |
263 | ||
91fb02f3 | 264 | int cmp_name(const void *name, const void *sym) |
403ed278 | 265 | { |
b605be65 | 266 | return strcmp(name, kernel_symbol_name(sym)); |
403ed278 AIB |
267 | } |
268 | ||
2d25bc55 JY |
269 | static bool find_exported_symbol_in_section(const struct symsearch *syms, |
270 | struct module *owner, | |
c6eee9df | 271 | struct find_symbol_arg *fsa) |
de4d8d53 | 272 | { |
403ed278 AIB |
273 | struct kernel_symbol *sym; |
274 | ||
cdd66eb5 MY |
275 | if (!fsa->gplok && syms->license == GPL_ONLY) |
276 | return false; | |
277 | ||
403ed278 AIB |
278 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, |
279 | sizeof(struct kernel_symbol), cmp_name); | |
7390b94a MY |
280 | if (!sym) |
281 | return false; | |
403ed278 | 282 | |
7390b94a MY |
283 | fsa->owner = owner; |
284 | fsa->crc = symversion(syms->crcs, sym - syms->start); | |
285 | fsa->sym = sym; | |
286 | fsa->license = syms->license; | |
de4d8d53 | 287 | |
7390b94a | 288 | return true; |
de4d8d53 RR |
289 | } |
290 | ||
24b9f0d2 SS |
291 | /* |
292 | * Find an exported symbol and return it, along with, (optional) crc and | |
293 | * (optional) module which owns it. Needs preempt disabled or module_mutex. | |
294 | */ | |
47889798 | 295 | bool find_symbol(struct find_symbol_arg *fsa) |
dafd0940 | 296 | { |
71e4b309 CH |
297 | static const struct symsearch arr[] = { |
298 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, | |
36794822 | 299 | NOT_GPL_ONLY }, |
71e4b309 CH |
300 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
301 | __start___kcrctab_gpl, | |
36794822 | 302 | GPL_ONLY }, |
71e4b309 | 303 | }; |
71e4b309 CH |
304 | struct module *mod; |
305 | unsigned int i; | |
dafd0940 | 306 | |
71e4b309 | 307 | module_assert_mutex_or_preempt(); |
dafd0940 | 308 | |
71e4b309 | 309 | for (i = 0; i < ARRAY_SIZE(arr); i++) |
0b96615c CH |
310 | if (find_exported_symbol_in_section(&arr[i], NULL, fsa)) |
311 | return true; | |
71e4b309 CH |
312 | |
313 | list_for_each_entry_rcu(mod, &modules, list, | |
314 | lockdep_is_held(&module_mutex)) { | |
315 | struct symsearch arr[] = { | |
316 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
36794822 | 317 | NOT_GPL_ONLY }, |
71e4b309 CH |
318 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
319 | mod->gpl_crcs, | |
36794822 | 320 | GPL_ONLY }, |
71e4b309 CH |
321 | }; |
322 | ||
323 | if (mod->state == MODULE_STATE_UNFORMED) | |
324 | continue; | |
325 | ||
326 | for (i = 0; i < ARRAY_SIZE(arr); i++) | |
0b96615c CH |
327 | if (find_exported_symbol_in_section(&arr[i], mod, fsa)) |
328 | return true; | |
dafd0940 RR |
329 | } |
330 | ||
0b96615c CH |
331 | pr_debug("Failed to find symbol %s\n", fsa->name); |
332 | return false; | |
1da177e4 LT |
333 | } |
334 | ||
fe0d34d2 RR |
335 | /* |
336 | * Search for module by name: must hold module_mutex (or preempt disabled | |
337 | * for read-only access). | |
338 | */ | |
91fb02f3 AT |
339 | struct module *find_module_all(const char *name, size_t len, |
340 | bool even_unformed) | |
1da177e4 LT |
341 | { |
342 | struct module *mod; | |
343 | ||
fe0d34d2 | 344 | module_assert_mutex_or_preempt(); |
0be964be | 345 | |
bf08949c MH |
346 | list_for_each_entry_rcu(mod, &modules, list, |
347 | lockdep_is_held(&module_mutex)) { | |
0d21b0e3 RR |
348 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
349 | continue; | |
4f6de4d5 | 350 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
351 | return mod; |
352 | } | |
353 | return NULL; | |
354 | } | |
0d21b0e3 RR |
355 | |
356 | struct module *find_module(const char *name) | |
357 | { | |
4f6de4d5 | 358 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 359 | } |
1da177e4 LT |
360 | |
361 | #ifdef CONFIG_SMP | |
fbf59bc9 | 362 | |
259354de | 363 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 364 | { |
259354de TH |
365 | return mod->percpu; |
366 | } | |
fbf59bc9 | 367 | |
9eb76d77 | 368 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 369 | { |
9eb76d77 RR |
370 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
371 | unsigned long align = pcpusec->sh_addralign; | |
372 | ||
373 | if (!pcpusec->sh_size) | |
374 | return 0; | |
375 | ||
fbf59bc9 | 376 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
377 | pr_warn("%s: per-cpu alignment %li > %li\n", |
378 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
379 | align = PAGE_SIZE; |
380 | } | |
381 | ||
9eb76d77 | 382 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 383 | if (!mod->percpu) { |
bddb12b3 AM |
384 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
385 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
386 | return -ENOMEM; |
387 | } | |
9eb76d77 | 388 | mod->percpu_size = pcpusec->sh_size; |
259354de | 389 | return 0; |
fbf59bc9 TH |
390 | } |
391 | ||
259354de | 392 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 393 | { |
259354de | 394 | free_percpu(mod->percpu); |
fbf59bc9 TH |
395 | } |
396 | ||
49668688 | 397 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 398 | { |
49668688 | 399 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
400 | } |
401 | ||
259354de TH |
402 | static void percpu_modcopy(struct module *mod, |
403 | const void *from, unsigned long size) | |
6b588c18 TH |
404 | { |
405 | int cpu; | |
406 | ||
407 | for_each_possible_cpu(cpu) | |
259354de | 408 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
409 | } |
410 | ||
383776fa | 411 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
412 | { |
413 | struct module *mod; | |
414 | unsigned int cpu; | |
415 | ||
416 | preempt_disable(); | |
417 | ||
418 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
419 | if (mod->state == MODULE_STATE_UNFORMED) |
420 | continue; | |
10fad5e4 TH |
421 | if (!mod->percpu_size) |
422 | continue; | |
423 | for_each_possible_cpu(cpu) { | |
424 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 425 | void *va = (void *)addr; |
10fad5e4 | 426 | |
383776fa | 427 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 428 | if (can_addr) { |
383776fa | 429 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
430 | *can_addr += (unsigned long) |
431 | per_cpu_ptr(mod->percpu, | |
432 | get_boot_cpu_id()); | |
433 | } | |
10fad5e4 TH |
434 | preempt_enable(); |
435 | return true; | |
436 | } | |
437 | } | |
438 | } | |
439 | ||
440 | preempt_enable(); | |
441 | return false; | |
6b588c18 TH |
442 | } |
443 | ||
383776fa | 444 | /** |
24389b61 | 445 | * is_module_percpu_address() - test whether address is from module static percpu |
383776fa TG |
446 | * @addr: address to test |
447 | * | |
448 | * Test whether @addr belongs to module static percpu area. | |
449 | * | |
24389b61 | 450 | * Return: %true if @addr is from module static percpu area |
383776fa TG |
451 | */ |
452 | bool is_module_percpu_address(unsigned long addr) | |
453 | { | |
454 | return __is_module_percpu_address(addr, NULL); | |
455 | } | |
456 | ||
1da177e4 | 457 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 458 | |
259354de | 459 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
460 | { |
461 | return NULL; | |
462 | } | |
9eb76d77 | 463 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 464 | { |
9eb76d77 RR |
465 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
466 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
467 | return -ENOMEM; | |
468 | return 0; | |
259354de TH |
469 | } |
470 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 471 | { |
1da177e4 | 472 | } |
49668688 | 473 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
474 | { |
475 | return 0; | |
476 | } | |
259354de TH |
477 | static inline void percpu_modcopy(struct module *mod, |
478 | const void *from, unsigned long size) | |
1da177e4 LT |
479 | { |
480 | /* pcpusec should be 0, and size of that section should be 0. */ | |
481 | BUG_ON(size != 0); | |
482 | } | |
10fad5e4 TH |
483 | bool is_module_percpu_address(unsigned long addr) |
484 | { | |
485 | return false; | |
486 | } | |
6b588c18 | 487 | |
383776fa TG |
488 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
489 | { | |
490 | return false; | |
491 | } | |
492 | ||
1da177e4 LT |
493 | #endif /* CONFIG_SMP */ |
494 | ||
c988d2b2 MD |
495 | #define MODINFO_ATTR(field) \ |
496 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
497 | { \ | |
498 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
499 | } \ | |
500 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 501 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 502 | { \ |
cc56ded3 | 503 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
504 | } \ |
505 | static int modinfo_##field##_exists(struct module *mod) \ | |
506 | { \ | |
507 | return mod->field != NULL; \ | |
508 | } \ | |
509 | static void free_modinfo_##field(struct module *mod) \ | |
510 | { \ | |
22a8bdeb DW |
511 | kfree(mod->field); \ |
512 | mod->field = NULL; \ | |
c988d2b2 MD |
513 | } \ |
514 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 515 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
516 | .show = show_modinfo_##field, \ |
517 | .setup = setup_modinfo_##field, \ | |
518 | .test = modinfo_##field##_exists, \ | |
519 | .free = free_modinfo_##field, \ | |
520 | }; | |
521 | ||
522 | MODINFO_ATTR(version); | |
523 | MODINFO_ATTR(srcversion); | |
524 | ||
6f1dae1d AT |
525 | static struct { |
526 | char name[MODULE_NAME_LEN + 1]; | |
527 | char taints[MODULE_FLAGS_BUF_SIZE]; | |
528 | } last_unloaded_module; | |
e14af7ee | 529 | |
03e88ae1 | 530 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
531 | |
532 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
533 | ||
e513cc1c MH |
534 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
535 | #define MODULE_REF_BASE 1 | |
536 | ||
1da177e4 | 537 | /* Init the unload section of the module. */ |
9f85a4bb | 538 | static int module_unload_init(struct module *mod) |
1da177e4 | 539 | { |
e513cc1c MH |
540 | /* |
541 | * Initialize reference counter to MODULE_REF_BASE. | |
542 | * refcnt == 0 means module is going. | |
543 | */ | |
544 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 545 | |
2c02dfe7 LT |
546 | INIT_LIST_HEAD(&mod->source_list); |
547 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 548 | |
1da177e4 | 549 | /* Hold reference count during initialization. */ |
e513cc1c | 550 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
551 | |
552 | return 0; | |
1da177e4 LT |
553 | } |
554 | ||
1da177e4 LT |
555 | /* Does a already use b? */ |
556 | static int already_uses(struct module *a, struct module *b) | |
557 | { | |
558 | struct module_use *use; | |
559 | ||
2c02dfe7 LT |
560 | list_for_each_entry(use, &b->source_list, source_list) { |
561 | if (use->source == a) { | |
5e124169 | 562 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
563 | return 1; |
564 | } | |
565 | } | |
5e124169 | 566 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
567 | return 0; |
568 | } | |
569 | ||
2c02dfe7 LT |
570 | /* |
571 | * Module a uses b | |
572 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
573 | * - the module_use is added to the list of 'b' sources (so | |
574 | * 'b' can walk the list to see who sourced them), and of 'a' | |
575 | * targets (so 'a' can see what modules it targets). | |
576 | */ | |
577 | static int add_module_usage(struct module *a, struct module *b) | |
578 | { | |
2c02dfe7 LT |
579 | struct module_use *use; |
580 | ||
5e124169 | 581 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 | 582 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
9ad04574 | 583 | if (!use) |
2c02dfe7 | 584 | return -ENOMEM; |
2c02dfe7 LT |
585 | |
586 | use->source = a; | |
587 | use->target = b; | |
588 | list_add(&use->source_list, &b->source_list); | |
589 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
590 | return 0; |
591 | } | |
592 | ||
75676500 | 593 | /* Module a uses b: caller needs module_mutex() */ |
7ef5264d | 594 | static int ref_module(struct module *a, struct module *b) |
1da177e4 | 595 | { |
c8e21ced | 596 | int err; |
270a6c4c | 597 | |
9bea7f23 | 598 | if (b == NULL || already_uses(a, b)) |
218ce735 | 599 | return 0; |
218ce735 | 600 | |
9bea7f23 RR |
601 | /* If module isn't available, we fail. */ |
602 | err = strong_try_module_get(b); | |
c9a3ba55 | 603 | if (err) |
9bea7f23 | 604 | return err; |
1da177e4 | 605 | |
2c02dfe7 LT |
606 | err = add_module_usage(a, b); |
607 | if (err) { | |
1da177e4 | 608 | module_put(b); |
9bea7f23 | 609 | return err; |
1da177e4 | 610 | } |
9bea7f23 | 611 | return 0; |
1da177e4 LT |
612 | } |
613 | ||
614 | /* Clear the unload stuff of the module. */ | |
615 | static void module_unload_free(struct module *mod) | |
616 | { | |
2c02dfe7 | 617 | struct module_use *use, *tmp; |
1da177e4 | 618 | |
75676500 | 619 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
620 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
621 | struct module *i = use->target; | |
5e124169 | 622 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
623 | module_put(i); |
624 | list_del(&use->source_list); | |
625 | list_del(&use->target_list); | |
626 | kfree(use); | |
1da177e4 | 627 | } |
75676500 | 628 | mutex_unlock(&module_mutex); |
1da177e4 LT |
629 | } |
630 | ||
631 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 632 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
633 | { |
634 | int ret = (flags & O_TRUNC); | |
635 | if (ret) | |
373d4d09 | 636 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
637 | return ret; |
638 | } | |
639 | #else | |
fb169793 | 640 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
641 | { |
642 | return 0; | |
643 | } | |
644 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
645 | ||
e513cc1c MH |
646 | /* Try to release refcount of module, 0 means success. */ |
647 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 648 | { |
e513cc1c | 649 | int ret; |
1da177e4 | 650 | |
e513cc1c MH |
651 | /* Try to decrement refcnt which we set at loading */ |
652 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
653 | BUG_ON(ret < 0); | |
654 | if (ret) | |
655 | /* Someone can put this right now, recover with checking */ | |
656 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 657 | |
e513cc1c MH |
658 | return ret; |
659 | } | |
1da177e4 | 660 | |
e513cc1c MH |
661 | static int try_stop_module(struct module *mod, int flags, int *forced) |
662 | { | |
da39ba5e | 663 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
664 | if (try_release_module_ref(mod) != 0) { |
665 | *forced = try_force_unload(flags); | |
666 | if (!(*forced)) | |
1da177e4 LT |
667 | return -EWOULDBLOCK; |
668 | } | |
669 | ||
670 | /* Mark it as dying. */ | |
e513cc1c | 671 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 672 | |
e513cc1c | 673 | return 0; |
1da177e4 LT |
674 | } |
675 | ||
d5db139a | 676 | /** |
24389b61 | 677 | * module_refcount() - return the refcount or -1 if unloading |
d5db139a RR |
678 | * @mod: the module we're checking |
679 | * | |
24389b61 | 680 | * Return: |
d5db139a RR |
681 | * -1 if the module is in the process of unloading |
682 | * otherwise the number of references in the kernel to the module | |
683 | */ | |
684 | int module_refcount(struct module *mod) | |
1da177e4 | 685 | { |
d5db139a | 686 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
687 | } |
688 | EXPORT_SYMBOL(module_refcount); | |
689 | ||
690 | /* This exists whether we can unload or not */ | |
691 | static void free_module(struct module *mod); | |
692 | ||
17da2bd9 HC |
693 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
694 | unsigned int, flags) | |
1da177e4 LT |
695 | { |
696 | struct module *mod; | |
dfff0a06 | 697 | char name[MODULE_NAME_LEN]; |
6f1dae1d | 698 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 LT |
699 | int ret, forced = 0; |
700 | ||
3d43321b | 701 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
702 | return -EPERM; |
703 | ||
704 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
705 | return -EFAULT; | |
706 | name[MODULE_NAME_LEN-1] = '\0'; | |
707 | ||
f6276ac9 RGB |
708 | audit_log_kern_module(name); |
709 | ||
3fc1f1e2 TH |
710 | if (mutex_lock_interruptible(&module_mutex) != 0) |
711 | return -EINTR; | |
1da177e4 LT |
712 | |
713 | mod = find_module(name); | |
714 | if (!mod) { | |
715 | ret = -ENOENT; | |
716 | goto out; | |
717 | } | |
718 | ||
2c02dfe7 | 719 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
720 | /* Other modules depend on us: get rid of them first. */ |
721 | ret = -EWOULDBLOCK; | |
722 | goto out; | |
723 | } | |
724 | ||
725 | /* Doing init or already dying? */ | |
726 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 727 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 728 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
729 | ret = -EBUSY; |
730 | goto out; | |
731 | } | |
732 | ||
733 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 734 | if (mod->init && !mod->exit) { |
fb169793 | 735 | forced = try_force_unload(flags); |
1da177e4 LT |
736 | if (!forced) { |
737 | /* This module can't be removed */ | |
738 | ret = -EBUSY; | |
739 | goto out; | |
740 | } | |
741 | } | |
742 | ||
1da177e4 LT |
743 | ret = try_stop_module(mod, flags, &forced); |
744 | if (ret != 0) | |
745 | goto out; | |
746 | ||
df4b565e | 747 | mutex_unlock(&module_mutex); |
25985edc | 748 | /* Final destruction now no one is using it. */ |
df4b565e | 749 | if (mod->exit != NULL) |
1da177e4 | 750 | mod->exit(); |
df4b565e PO |
751 | blocking_notifier_call_chain(&module_notify_list, |
752 | MODULE_STATE_GOING, mod); | |
7e545d6e | 753 | klp_module_going(mod); |
7dcd182b JY |
754 | ftrace_release_mod(mod); |
755 | ||
22a9d645 | 756 | async_synchronize_full(); |
75676500 | 757 | |
6f1dae1d AT |
758 | /* Store the name and taints of the last unloaded module for diagnostic purposes */ |
759 | strscpy(last_unloaded_module.name, mod->name, sizeof(last_unloaded_module.name)); | |
760 | strscpy(last_unloaded_module.taints, module_flags(mod, buf, false), sizeof(last_unloaded_module.taints)); | |
1da177e4 | 761 | |
75676500 | 762 | free_module(mod); |
5d603311 KK |
763 | /* someone could wait for the module in add_unformed_module() */ |
764 | wake_up_all(&module_wq); | |
75676500 RR |
765 | return 0; |
766 | out: | |
6389a385 | 767 | mutex_unlock(&module_mutex); |
1da177e4 LT |
768 | return ret; |
769 | } | |
770 | ||
1da177e4 LT |
771 | void __symbol_put(const char *symbol) |
772 | { | |
0b96615c CH |
773 | struct find_symbol_arg fsa = { |
774 | .name = symbol, | |
775 | .gplok = true, | |
776 | }; | |
1da177e4 | 777 | |
24da1cbf | 778 | preempt_disable(); |
02b2fb45 | 779 | BUG_ON(!find_symbol(&fsa)); |
0b96615c | 780 | module_put(fsa.owner); |
24da1cbf | 781 | preempt_enable(); |
1da177e4 LT |
782 | } |
783 | EXPORT_SYMBOL(__symbol_put); | |
784 | ||
7d1d16e4 | 785 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
786 | void symbol_put_addr(void *addr) |
787 | { | |
5e376613 | 788 | struct module *modaddr; |
7d1d16e4 | 789 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 790 | |
7d1d16e4 | 791 | if (core_kernel_text(a)) |
5e376613 | 792 | return; |
1da177e4 | 793 | |
275d7d44 PZ |
794 | /* |
795 | * Even though we hold a reference on the module; we still need to | |
796 | * disable preemption in order to safely traverse the data structure. | |
797 | */ | |
798 | preempt_disable(); | |
7d1d16e4 | 799 | modaddr = __module_text_address(a); |
a6e6abd5 | 800 | BUG_ON(!modaddr); |
5e376613 | 801 | module_put(modaddr); |
275d7d44 | 802 | preempt_enable(); |
1da177e4 LT |
803 | } |
804 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
805 | ||
806 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 807 | struct module_kobject *mk, char *buffer) |
1da177e4 | 808 | { |
d5db139a | 809 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
810 | } |
811 | ||
cca3e707 KS |
812 | static struct module_attribute modinfo_refcnt = |
813 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 814 | |
d53799be SR |
815 | void __module_get(struct module *module) |
816 | { | |
817 | if (module) { | |
818 | preempt_disable(); | |
2f35c41f | 819 | atomic_inc(&module->refcnt); |
d53799be SR |
820 | trace_module_get(module, _RET_IP_); |
821 | preempt_enable(); | |
822 | } | |
823 | } | |
824 | EXPORT_SYMBOL(__module_get); | |
825 | ||
826 | bool try_module_get(struct module *module) | |
827 | { | |
828 | bool ret = true; | |
829 | ||
830 | if (module) { | |
831 | preempt_disable(); | |
e513cc1c MH |
832 | /* Note: here, we can fail to get a reference */ |
833 | if (likely(module_is_live(module) && | |
834 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 835 | trace_module_get(module, _RET_IP_); |
e513cc1c | 836 | else |
d53799be SR |
837 | ret = false; |
838 | ||
839 | preempt_enable(); | |
840 | } | |
841 | return ret; | |
842 | } | |
843 | EXPORT_SYMBOL(try_module_get); | |
844 | ||
f6a57033 AV |
845 | void module_put(struct module *module) |
846 | { | |
e513cc1c MH |
847 | int ret; |
848 | ||
f6a57033 | 849 | if (module) { |
e1783a24 | 850 | preempt_disable(); |
e513cc1c MH |
851 | ret = atomic_dec_if_positive(&module->refcnt); |
852 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 853 | trace_module_put(module, _RET_IP_); |
e1783a24 | 854 | preempt_enable(); |
f6a57033 AV |
855 | } |
856 | } | |
857 | EXPORT_SYMBOL(module_put); | |
858 | ||
1da177e4 | 859 | #else /* !CONFIG_MODULE_UNLOAD */ |
1da177e4 LT |
860 | static inline void module_unload_free(struct module *mod) |
861 | { | |
862 | } | |
863 | ||
7ef5264d | 864 | static int ref_module(struct module *a, struct module *b) |
1da177e4 | 865 | { |
9bea7f23 | 866 | return strong_try_module_get(b); |
1da177e4 LT |
867 | } |
868 | ||
9f85a4bb | 869 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 870 | { |
9f85a4bb | 871 | return 0; |
1da177e4 LT |
872 | } |
873 | #endif /* CONFIG_MODULE_UNLOAD */ | |
874 | ||
c14e522b | 875 | size_t module_flags_taint(unsigned long taints, char *buf) |
53999bf3 KW |
876 | { |
877 | size_t l = 0; | |
7fd8329b PM |
878 | int i; |
879 | ||
880 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
c14e522b | 881 | if (taint_flags[i].module && test_bit(i, &taints)) |
5eb7c0d0 | 882 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 883 | } |
53999bf3 | 884 | |
53999bf3 KW |
885 | return l; |
886 | } | |
887 | ||
1f71740a | 888 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 889 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
890 | { |
891 | const char *state = "unknown"; | |
892 | ||
4befb026 | 893 | switch (mk->mod->state) { |
1f71740a KS |
894 | case MODULE_STATE_LIVE: |
895 | state = "live"; | |
896 | break; | |
897 | case MODULE_STATE_COMING: | |
898 | state = "coming"; | |
899 | break; | |
900 | case MODULE_STATE_GOING: | |
901 | state = "going"; | |
902 | break; | |
0d21b0e3 RR |
903 | default: |
904 | BUG(); | |
1f71740a KS |
905 | } |
906 | return sprintf(buffer, "%s\n", state); | |
907 | } | |
908 | ||
cca3e707 KS |
909 | static struct module_attribute modinfo_initstate = |
910 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 911 | |
88bfa324 KS |
912 | static ssize_t store_uevent(struct module_attribute *mattr, |
913 | struct module_kobject *mk, | |
914 | const char *buffer, size_t count) | |
915 | { | |
df44b479 PR |
916 | int rc; |
917 | ||
918 | rc = kobject_synth_uevent(&mk->kobj, buffer, count); | |
919 | return rc ? rc : count; | |
88bfa324 KS |
920 | } |
921 | ||
cca3e707 KS |
922 | struct module_attribute module_uevent = |
923 | __ATTR(uevent, 0200, NULL, store_uevent); | |
924 | ||
925 | static ssize_t show_coresize(struct module_attribute *mattr, | |
926 | struct module_kobject *mk, char *buffer) | |
927 | { | |
7523e4dc | 928 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
929 | } |
930 | ||
931 | static struct module_attribute modinfo_coresize = | |
932 | __ATTR(coresize, 0444, show_coresize, NULL); | |
933 | ||
01dc0386 CL |
934 | #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC |
935 | static ssize_t show_datasize(struct module_attribute *mattr, | |
936 | struct module_kobject *mk, char *buffer) | |
937 | { | |
938 | return sprintf(buffer, "%u\n", mk->mod->data_layout.size); | |
939 | } | |
940 | ||
941 | static struct module_attribute modinfo_datasize = | |
942 | __ATTR(datasize, 0444, show_datasize, NULL); | |
943 | #endif | |
944 | ||
cca3e707 KS |
945 | static ssize_t show_initsize(struct module_attribute *mattr, |
946 | struct module_kobject *mk, char *buffer) | |
947 | { | |
7523e4dc | 948 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
949 | } |
950 | ||
951 | static struct module_attribute modinfo_initsize = | |
952 | __ATTR(initsize, 0444, show_initsize, NULL); | |
953 | ||
954 | static ssize_t show_taint(struct module_attribute *mattr, | |
955 | struct module_kobject *mk, char *buffer) | |
956 | { | |
957 | size_t l; | |
958 | ||
c14e522b | 959 | l = module_flags_taint(mk->mod->taints, buffer); |
cca3e707 KS |
960 | buffer[l++] = '\n'; |
961 | return l; | |
962 | } | |
963 | ||
964 | static struct module_attribute modinfo_taint = | |
965 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 966 | |
44c09535 | 967 | struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 968 | &module_uevent, |
03e88ae1 GKH |
969 | &modinfo_version, |
970 | &modinfo_srcversion, | |
cca3e707 KS |
971 | &modinfo_initstate, |
972 | &modinfo_coresize, | |
01dc0386 CL |
973 | #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC |
974 | &modinfo_datasize, | |
975 | #endif | |
cca3e707 KS |
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 | ||
8eac910a | 1034 | static bool inherit_taint(struct module *mod, struct module *owner, const char *name) |
262e6ae7 CH |
1035 | { |
1036 | if (!owner || !test_bit(TAINT_PROPRIETARY_MODULE, &owner->taints)) | |
1037 | return true; | |
1038 | ||
1039 | if (mod->using_gplonly_symbols) { | |
8eac910a LC |
1040 | pr_err("%s: module using GPL-only symbols uses symbols %s from proprietary module %s.\n", |
1041 | mod->name, name, owner->name); | |
262e6ae7 CH |
1042 | return false; |
1043 | } | |
1044 | ||
1045 | if (!test_bit(TAINT_PROPRIETARY_MODULE, &mod->taints)) { | |
8eac910a LC |
1046 | pr_warn("%s: module uses symbols %s from proprietary module %s, inheriting taint.\n", |
1047 | mod->name, name, owner->name); | |
262e6ae7 CH |
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 | ||
8eac910a | 1079 | if (!inherit_taint(mod, fsa.owner, name)) { |
0b96615c | 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 | ||
75676500 | 1145 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1146 | static void free_module(struct module *mod) |
1147 | { | |
7ead8b83 LZ |
1148 | trace_module_free(mod); |
1149 | ||
36b0360d | 1150 | mod_sysfs_teardown(mod); |
1da177e4 | 1151 | |
24b9f0d2 SS |
1152 | /* |
1153 | * We leave it in list to prevent duplicate loads, but make sure | |
1154 | * that noone uses it while it's being deconstructed. | |
1155 | */ | |
d3051b48 | 1156 | mutex_lock(&module_mutex); |
944a1fa0 | 1157 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 1158 | mutex_unlock(&module_mutex); |
944a1fa0 | 1159 | |
b82bab4b JB |
1160 | /* Remove dynamic debug info */ |
1161 | ddebug_remove_module(mod->name); | |
1162 | ||
1da177e4 LT |
1163 | /* Arch-specific cleanup. */ |
1164 | module_arch_cleanup(mod); | |
1165 | ||
1166 | /* Module unload stuff */ | |
1167 | module_unload_free(mod); | |
1168 | ||
e180a6b7 RR |
1169 | /* Free any allocated parameters. */ |
1170 | destroy_params(mod->kp, mod->num_kp); | |
1171 | ||
1ce15ef4 JY |
1172 | if (is_livepatch_module(mod)) |
1173 | free_module_elf(mod); | |
1174 | ||
944a1fa0 RR |
1175 | /* Now we can delete it from the lists */ |
1176 | mutex_lock(&module_mutex); | |
461e34ae MH |
1177 | /* Unlink carefully: kallsyms could be walking list. */ |
1178 | list_del_rcu(&mod->list); | |
93c2e105 | 1179 | mod_tree_remove(mod); |
0286b5ea | 1180 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 1181 | module_bug_cleanup(mod); |
0be964be | 1182 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
cb2f5536 | 1183 | synchronize_rcu(); |
99bd9956 AT |
1184 | if (try_add_tainted_module(mod)) |
1185 | pr_err("%s: adding tainted module to the unloaded tainted modules list failed.\n", | |
1186 | mod->name); | |
944a1fa0 RR |
1187 | mutex_unlock(&module_mutex); |
1188 | ||
85c898db | 1189 | /* This may be empty, but that's OK */ |
d453cded | 1190 | module_arch_freeing_init(mod); |
7523e4dc | 1191 | module_memfree(mod->init_layout.base); |
1da177e4 | 1192 | kfree(mod->args); |
259354de | 1193 | percpu_modfree(mod); |
9f85a4bb | 1194 | |
35a9393c | 1195 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
6ab9942c | 1196 | lockdep_free_key_range(mod->data_layout.base, mod->data_layout.size); |
fbb9ce95 | 1197 | |
1da177e4 | 1198 | /* Finally, free the core (containing the module structure) */ |
7523e4dc | 1199 | module_memfree(mod->core_layout.base); |
01dc0386 CL |
1200 | #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC |
1201 | vfree(mod->data_layout.base); | |
1202 | #endif | |
1da177e4 LT |
1203 | } |
1204 | ||
1205 | void *__symbol_get(const char *symbol) | |
1206 | { | |
0b96615c CH |
1207 | struct find_symbol_arg fsa = { |
1208 | .name = symbol, | |
1209 | .gplok = true, | |
1210 | .warn = true, | |
1211 | }; | |
1da177e4 | 1212 | |
24da1cbf | 1213 | preempt_disable(); |
97a11d0b CH |
1214 | if (!find_symbol(&fsa)) |
1215 | goto fail; | |
1216 | if (fsa.license != GPL_ONLY) { | |
1217 | pr_warn("failing symbol_get of non-GPLONLY symbol %s.\n", | |
1218 | symbol); | |
1219 | goto fail; | |
0b96615c | 1220 | } |
97a11d0b CH |
1221 | if (strong_try_module_get(fsa.owner)) |
1222 | goto fail; | |
24da1cbf | 1223 | preempt_enable(); |
0b96615c | 1224 | return (void *)kernel_symbol_value(fsa.sym); |
97a11d0b CH |
1225 | fail: |
1226 | preempt_enable(); | |
1227 | return NULL; | |
1da177e4 LT |
1228 | } |
1229 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1230 | ||
eea8b54d AN |
1231 | /* |
1232 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1233 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1234 | * |
1235 | * You must hold the module_mutex. | |
eea8b54d | 1236 | */ |
2d25bc55 | 1237 | static int verify_exported_symbols(struct module *mod) |
eea8b54d | 1238 | { |
b211104d | 1239 | unsigned int i; |
b211104d RR |
1240 | const struct kernel_symbol *s; |
1241 | struct { | |
1242 | const struct kernel_symbol *sym; | |
1243 | unsigned int num; | |
1244 | } arr[] = { | |
1245 | { mod->syms, mod->num_syms }, | |
1246 | { mod->gpl_syms, mod->num_gpl_syms }, | |
b211104d | 1247 | }; |
eea8b54d | 1248 | |
b211104d RR |
1249 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1250 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
0b96615c CH |
1251 | struct find_symbol_arg fsa = { |
1252 | .name = kernel_symbol_name(s), | |
1253 | .gplok = true, | |
1254 | }; | |
1255 | if (find_symbol(&fsa)) { | |
bddb12b3 | 1256 | pr_err("%s: exports duplicate symbol %s" |
b211104d | 1257 | " (owned by %s)\n", |
7290d580 | 1258 | mod->name, kernel_symbol_name(s), |
0b96615c | 1259 | module_name(fsa.owner)); |
b211104d RR |
1260 | return -ENOEXEC; |
1261 | } | |
eea8b54d | 1262 | } |
b211104d RR |
1263 | } |
1264 | return 0; | |
eea8b54d AN |
1265 | } |
1266 | ||
ebfac7b7 FS |
1267 | static bool ignore_undef_symbol(Elf_Half emachine, const char *name) |
1268 | { | |
1269 | /* | |
1270 | * On x86, PIC code and Clang non-PIC code may have call foo@PLT. GNU as | |
1271 | * before 2.37 produces an unreferenced _GLOBAL_OFFSET_TABLE_ on x86-64. | |
1272 | * i386 has a similar problem but may not deserve a fix. | |
1273 | * | |
1274 | * If we ever have to ignore many symbols, consider refactoring the code to | |
1275 | * only warn if referenced by a relocation. | |
1276 | */ | |
1277 | if (emachine == EM_386 || emachine == EM_X86_64) | |
1278 | return !strcmp(name, "_GLOBAL_OFFSET_TABLE_"); | |
1279 | return false; | |
1280 | } | |
1281 | ||
9a4b9708 | 1282 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
1283 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
1284 | { | |
1285 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
1286 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 1287 | unsigned long secbase; |
49668688 | 1288 | unsigned int i; |
1da177e4 | 1289 | int ret = 0; |
414fd31b | 1290 | const struct kernel_symbol *ksym; |
1da177e4 | 1291 | |
49668688 RR |
1292 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
1293 | const char *name = info->strtab + sym[i].st_name; | |
1294 | ||
1da177e4 LT |
1295 | switch (sym[i].st_shndx) { |
1296 | case SHN_COMMON: | |
80375980 JM |
1297 | /* Ignore common symbols */ |
1298 | if (!strncmp(name, "__gnu_lto", 9)) | |
1299 | break; | |
1300 | ||
24b9f0d2 SS |
1301 | /* |
1302 | * We compiled with -fno-common. These are not | |
1303 | * supposed to happen. | |
1304 | */ | |
5e124169 | 1305 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 1306 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
1307 | mod->name); |
1308 | ret = -ENOEXEC; | |
1309 | break; | |
1310 | ||
1311 | case SHN_ABS: | |
1312 | /* Don't need to do anything */ | |
5e124169 | 1313 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
1314 | (long)sym[i].st_value); |
1315 | break; | |
1316 | ||
1ce15ef4 JY |
1317 | case SHN_LIVEPATCH: |
1318 | /* Livepatch symbols are resolved by livepatch */ | |
1319 | break; | |
1320 | ||
1da177e4 | 1321 | case SHN_UNDEF: |
49668688 | 1322 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 1323 | /* Ok if resolved. */ |
9bea7f23 | 1324 | if (ksym && !IS_ERR(ksym)) { |
7290d580 | 1325 | sym[i].st_value = kernel_symbol_value(ksym); |
1da177e4 | 1326 | break; |
414fd31b TA |
1327 | } |
1328 | ||
ebfac7b7 FS |
1329 | /* Ok if weak or ignored. */ |
1330 | if (!ksym && | |
1331 | (ELF_ST_BIND(sym[i].st_info) == STB_WEAK || | |
1332 | ignore_undef_symbol(info->hdr->e_machine, name))) | |
1da177e4 LT |
1333 | break; |
1334 | ||
9bea7f23 | 1335 | ret = PTR_ERR(ksym) ?: -ENOENT; |
62267e0e JD |
1336 | pr_warn("%s: Unknown symbol %s (err %d)\n", |
1337 | mod->name, name, ret); | |
1da177e4 LT |
1338 | break; |
1339 | ||
1340 | default: | |
1341 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 1342 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 1343 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 1344 | else |
49668688 | 1345 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
1346 | sym[i].st_value += secbase; |
1347 | break; | |
1348 | } | |
1349 | } | |
1350 | ||
1351 | return ret; | |
1352 | } | |
1353 | ||
49668688 | 1354 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
1355 | { |
1356 | unsigned int i; | |
1357 | int err = 0; | |
1358 | ||
1359 | /* Now do relocations. */ | |
49668688 RR |
1360 | for (i = 1; i < info->hdr->e_shnum; i++) { |
1361 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
1362 | |
1363 | /* Not a valid relocation section? */ | |
49668688 | 1364 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
1365 | continue; |
1366 | ||
1367 | /* Don't bother with non-allocated sections */ | |
49668688 | 1368 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
1369 | continue; |
1370 | ||
1ce15ef4 | 1371 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) |
7c8e2bdd JP |
1372 | err = klp_apply_section_relocs(mod, info->sechdrs, |
1373 | info->secstrings, | |
1374 | info->strtab, | |
1375 | info->index.sym, i, | |
1376 | NULL); | |
1377 | else if (info->sechdrs[i].sh_type == SHT_REL) | |
49668688 RR |
1378 | err = apply_relocate(info->sechdrs, info->strtab, |
1379 | info->index.sym, i, mod); | |
1380 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
1381 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
1382 | info->index.sym, i, mod); | |
22e268eb RR |
1383 | if (err < 0) |
1384 | break; | |
1385 | } | |
1386 | return err; | |
1387 | } | |
1388 | ||
088af9a6 HD |
1389 | /* Additional bytes needed by arch in front of individual sections */ |
1390 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1391 | unsigned int section) | |
1392 | { | |
1393 | /* default implementation just returns zero */ | |
1394 | return 0; | |
1395 | } | |
1396 | ||
1da177e4 | 1397 | /* Update size with this section: return offset. */ |
91fb02f3 | 1398 | long module_get_offset(struct module *mod, unsigned int *size, |
088af9a6 | 1399 | Elf_Shdr *sechdr, unsigned int section) |
1da177e4 LT |
1400 | { |
1401 | long ret; | |
1402 | ||
088af9a6 | 1403 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1404 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1405 | *size = ret + sechdr->sh_size; | |
1406 | return ret; | |
1407 | } | |
1408 | ||
0c4300b5 | 1409 | bool module_init_layout_section(const char *sname) |
055f23b7 JY |
1410 | { |
1411 | #ifndef CONFIG_MODULE_UNLOAD | |
1412 | if (module_exit_section(sname)) | |
1413 | return true; | |
1414 | #endif | |
1415 | return module_init_section(sname); | |
1416 | } | |
1417 | ||
24b9f0d2 SS |
1418 | /* |
1419 | * Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1420 | * might -- code, read-only data, read-write data, small data. Tally | |
1421 | * sizes, and place the offsets into sh_entsize fields: high bit means it | |
1422 | * belongs in init. | |
1423 | */ | |
49668688 | 1424 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
1425 | { |
1426 | static unsigned long const masks[][2] = { | |
24b9f0d2 SS |
1427 | /* |
1428 | * NOTE: all executable code must be the first section | |
1da177e4 | 1429 | * in this array; otherwise modify the text_size |
24b9f0d2 SS |
1430 | * finder in the two loops below |
1431 | */ | |
1da177e4 LT |
1432 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
1433 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 1434 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
1435 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
1436 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1437 | }; | |
1438 | unsigned int m, i; | |
1439 | ||
49668688 RR |
1440 | for (i = 0; i < info->hdr->e_shnum; i++) |
1441 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 1442 | |
5e124169 | 1443 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 1444 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
1445 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
1446 | Elf_Shdr *s = &info->sechdrs[i]; | |
1447 | const char *sname = info->secstrings + s->sh_name; | |
6ab9942c | 1448 | unsigned int *sizep; |
1da177e4 LT |
1449 | |
1450 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1451 | || (s->sh_flags & masks[m][1]) | |
1452 | || s->sh_entsize != ~0UL | |
055f23b7 | 1453 | || module_init_layout_section(sname)) |
1da177e4 | 1454 | continue; |
6ab9942c CL |
1455 | sizep = m ? &mod->data_layout.size : &mod->core_layout.size; |
1456 | s->sh_entsize = module_get_offset(mod, sizep, s, i); | |
5e124169 | 1457 | pr_debug("\t%s\n", sname); |
1da177e4 | 1458 | } |
84e1c6bb | 1459 | switch (m) { |
1460 | case 0: /* executable */ | |
7337f929 | 1461 | mod->core_layout.size = strict_align(mod->core_layout.size); |
7523e4dc | 1462 | mod->core_layout.text_size = mod->core_layout.size; |
84e1c6bb | 1463 | break; |
1464 | case 1: /* RO: text and ro-data */ | |
6ab9942c CL |
1465 | mod->data_layout.size = strict_align(mod->data_layout.size); |
1466 | mod->data_layout.ro_size = mod->data_layout.size; | |
84e1c6bb | 1467 | break; |
444d13ff | 1468 | case 2: /* RO after init */ |
6ab9942c CL |
1469 | mod->data_layout.size = strict_align(mod->data_layout.size); |
1470 | mod->data_layout.ro_after_init_size = mod->data_layout.size; | |
444d13ff JY |
1471 | break; |
1472 | case 4: /* whole core */ | |
6ab9942c | 1473 | mod->data_layout.size = strict_align(mod->data_layout.size); |
84e1c6bb | 1474 | break; |
1475 | } | |
1da177e4 LT |
1476 | } |
1477 | ||
5e124169 | 1478 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 1479 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
1480 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
1481 | Elf_Shdr *s = &info->sechdrs[i]; | |
1482 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
1483 | |
1484 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1485 | || (s->sh_flags & masks[m][1]) | |
1486 | || s->sh_entsize != ~0UL | |
055f23b7 | 1487 | || !module_init_layout_section(sname)) |
1da177e4 | 1488 | continue; |
91fb02f3 | 1489 | s->sh_entsize = (module_get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 1490 | | INIT_OFFSET_MASK); |
5e124169 | 1491 | pr_debug("\t%s\n", sname); |
1da177e4 | 1492 | } |
84e1c6bb | 1493 | switch (m) { |
1494 | case 0: /* executable */ | |
7337f929 | 1495 | mod->init_layout.size = strict_align(mod->init_layout.size); |
7523e4dc | 1496 | mod->init_layout.text_size = mod->init_layout.size; |
84e1c6bb | 1497 | break; |
1498 | case 1: /* RO: text and ro-data */ | |
7337f929 | 1499 | mod->init_layout.size = strict_align(mod->init_layout.size); |
7523e4dc | 1500 | mod->init_layout.ro_size = mod->init_layout.size; |
84e1c6bb | 1501 | break; |
444d13ff JY |
1502 | case 2: |
1503 | /* | |
1504 | * RO after init doesn't apply to init_layout (only | |
1505 | * core_layout), so it just takes the value of ro_size. | |
1506 | */ | |
1507 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
1508 | break; | |
1509 | case 4: /* whole init */ | |
7337f929 | 1510 | mod->init_layout.size = strict_align(mod->init_layout.size); |
84e1c6bb | 1511 | break; |
1512 | } | |
1da177e4 LT |
1513 | } |
1514 | } | |
1515 | ||
1da177e4 LT |
1516 | static void set_license(struct module *mod, const char *license) |
1517 | { | |
1518 | if (!license) | |
1519 | license = "unspecified"; | |
1520 | ||
fa3ba2e8 | 1521 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1522 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
1523 | pr_warn("%s: module license '%s' taints kernel.\n", |
1524 | mod->name, license); | |
373d4d09 RR |
1525 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
1526 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
1527 | } |
1528 | } | |
1529 | ||
1530 | /* Parse tag=value strings from .modinfo section */ | |
1531 | static char *next_string(char *string, unsigned long *secsize) | |
1532 | { | |
1533 | /* Skip non-zero chars */ | |
1534 | while (string[0]) { | |
1535 | string++; | |
1536 | if ((*secsize)-- <= 1) | |
1537 | return NULL; | |
1538 | } | |
1539 | ||
1540 | /* Skip any zero padding. */ | |
1541 | while (!string[0]) { | |
1542 | string++; | |
1543 | if ((*secsize)-- <= 1) | |
1544 | return NULL; | |
1545 | } | |
1546 | return string; | |
1547 | } | |
1548 | ||
c5e4a062 MM |
1549 | static char *get_next_modinfo(const struct load_info *info, const char *tag, |
1550 | char *prev) | |
1da177e4 LT |
1551 | { |
1552 | char *p; | |
1553 | unsigned int taglen = strlen(tag); | |
49668688 RR |
1554 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
1555 | unsigned long size = infosec->sh_size; | |
1da177e4 | 1556 | |
5fdc7db6 JY |
1557 | /* |
1558 | * get_modinfo() calls made before rewrite_section_headers() | |
1559 | * must use sh_offset, as sh_addr isn't set! | |
1560 | */ | |
c5e4a062 MM |
1561 | char *modinfo = (char *)info->hdr + infosec->sh_offset; |
1562 | ||
1563 | if (prev) { | |
1564 | size -= prev - modinfo; | |
1565 | modinfo = next_string(prev, &size); | |
1566 | } | |
1567 | ||
1568 | for (p = modinfo; p; p = next_string(p, &size)) { | |
1da177e4 LT |
1569 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
1570 | return p + taglen + 1; | |
1571 | } | |
1572 | return NULL; | |
1573 | } | |
1574 | ||
c5e4a062 MM |
1575 | static char *get_modinfo(const struct load_info *info, const char *tag) |
1576 | { | |
1577 | return get_next_modinfo(info, tag, NULL); | |
1578 | } | |
1579 | ||
49668688 | 1580 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
1581 | { |
1582 | struct module_attribute *attr; | |
1583 | int i; | |
1584 | ||
1585 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1586 | if (attr->setup) | |
49668688 | 1587 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
1588 | } |
1589 | } | |
c988d2b2 | 1590 | |
a263f776 RR |
1591 | static void free_modinfo(struct module *mod) |
1592 | { | |
1593 | struct module_attribute *attr; | |
1594 | int i; | |
1595 | ||
1596 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
1597 | if (attr->free) | |
1598 | attr->free(mod); | |
1599 | } | |
1600 | } | |
1601 | ||
b7b4eebd | 1602 | static void dynamic_debug_setup(struct module *mod, struct _ddebug_info *dyndbg) |
346e15be | 1603 | { |
b7b4eebd | 1604 | if (!dyndbg->num_descs) |
811d66a0 | 1605 | return; |
b7b4eebd | 1606 | ddebug_add_module(dyndbg, mod->name); |
5e458cc0 | 1607 | } |
346e15be | 1608 | |
b7b4eebd | 1609 | static void dynamic_debug_remove(struct module *mod, struct _ddebug_info *dyndbg) |
ff49d74a | 1610 | { |
b7b4eebd | 1611 | if (dyndbg->num_descs) |
52796312 | 1612 | ddebug_remove_module(mod->name); |
ff49d74a YS |
1613 | } |
1614 | ||
74e08fcf JB |
1615 | void * __weak module_alloc(unsigned long size) |
1616 | { | |
7a0e27b2 CH |
1617 | return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, |
1618 | GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, | |
a3a66c38 | 1619 | NUMA_NO_NODE, __builtin_return_address(0)); |
74e08fcf JB |
1620 | } |
1621 | ||
23189766 VW |
1622 | bool __weak module_init_section(const char *name) |
1623 | { | |
1624 | return strstarts(name, ".init"); | |
1625 | } | |
1626 | ||
38b37d63 MS |
1627 | bool __weak module_exit_section(const char *name) |
1628 | { | |
1629 | return strstarts(name, ".exit"); | |
1630 | } | |
1631 | ||
ec2a2959 | 1632 | static int validate_section_offset(struct load_info *info, Elf_Shdr *shdr) |
40dd2560 | 1633 | { |
d83d42d0 SK |
1634 | #if defined(CONFIG_64BIT) |
1635 | unsigned long long secend; | |
1636 | #else | |
ec2a2959 | 1637 | unsigned long secend; |
d83d42d0 | 1638 | #endif |
ec2a2959 FL |
1639 | |
1640 | /* | |
1641 | * Check for both overflow and offset/size being | |
1642 | * too large. | |
1643 | */ | |
1644 | secend = shdr->sh_offset + shdr->sh_size; | |
1645 | if (secend < shdr->sh_offset || secend > info->len) | |
1646 | return -ENOEXEC; | |
1647 | ||
1648 | return 0; | |
1649 | } | |
1650 | ||
1651 | /* | |
1652 | * Sanity checks against invalid binaries, wrong arch, weird elf version. | |
1653 | * | |
1654 | * Also do basic validity checks against section offsets and sizes, the | |
1655 | * section name string table, and the indices used for it (sh_name). | |
1656 | */ | |
1657 | static int elf_validity_check(struct load_info *info) | |
1658 | { | |
1659 | unsigned int i; | |
1660 | Elf_Shdr *shdr, *strhdr; | |
1661 | int err; | |
1662 | ||
7fd982f3 SK |
1663 | if (info->len < sizeof(*(info->hdr))) { |
1664 | pr_err("Invalid ELF header len %lu\n", info->len); | |
1665 | goto no_exec; | |
1666 | } | |
34e1169d | 1667 | |
7fd982f3 SK |
1668 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0) { |
1669 | pr_err("Invalid ELF header magic: != %s\n", ELFMAG); | |
1670 | goto no_exec; | |
1671 | } | |
1672 | if (info->hdr->e_type != ET_REL) { | |
1673 | pr_err("Invalid ELF header type: %u != %u\n", | |
1674 | info->hdr->e_type, ET_REL); | |
1675 | goto no_exec; | |
1676 | } | |
1677 | if (!elf_check_arch(info->hdr)) { | |
1678 | pr_err("Invalid architecture in ELF header: %u\n", | |
1679 | info->hdr->e_machine); | |
1680 | goto no_exec; | |
1681 | } | |
f9231a99 NP |
1682 | if (!module_elf_check_arch(info->hdr)) { |
1683 | pr_err("Invalid module architecture in ELF header: %u\n", | |
1684 | info->hdr->e_machine); | |
1685 | goto no_exec; | |
1686 | } | |
7fd982f3 SK |
1687 | if (info->hdr->e_shentsize != sizeof(Elf_Shdr)) { |
1688 | pr_err("Invalid ELF section header size\n"); | |
1689 | goto no_exec; | |
1690 | } | |
34e1169d | 1691 | |
ec2a2959 FL |
1692 | /* |
1693 | * e_shnum is 16 bits, and sizeof(Elf_Shdr) is | |
1694 | * known and small. So e_shnum * sizeof(Elf_Shdr) | |
1695 | * will not overflow unsigned long on any platform. | |
1696 | */ | |
34e1169d KC |
1697 | if (info->hdr->e_shoff >= info->len |
1698 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
7fd982f3 SK |
1699 | info->len - info->hdr->e_shoff)) { |
1700 | pr_err("Invalid ELF section header overflow\n"); | |
1701 | goto no_exec; | |
1702 | } | |
40dd2560 | 1703 | |
ec2a2959 FL |
1704 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; |
1705 | ||
1706 | /* | |
1707 | * Verify if the section name table index is valid. | |
1708 | */ | |
1709 | if (info->hdr->e_shstrndx == SHN_UNDEF | |
7fd982f3 SK |
1710 | || info->hdr->e_shstrndx >= info->hdr->e_shnum) { |
1711 | pr_err("Invalid ELF section name index: %d || e_shstrndx (%d) >= e_shnum (%d)\n", | |
1712 | info->hdr->e_shstrndx, info->hdr->e_shstrndx, | |
1713 | info->hdr->e_shnum); | |
1714 | goto no_exec; | |
1715 | } | |
ec2a2959 FL |
1716 | |
1717 | strhdr = &info->sechdrs[info->hdr->e_shstrndx]; | |
1718 | err = validate_section_offset(info, strhdr); | |
7fd982f3 SK |
1719 | if (err < 0) { |
1720 | pr_err("Invalid ELF section hdr(type %u)\n", strhdr->sh_type); | |
ec2a2959 | 1721 | return err; |
7fd982f3 | 1722 | } |
ec2a2959 FL |
1723 | |
1724 | /* | |
1725 | * The section name table must be NUL-terminated, as required | |
1726 | * by the spec. This makes strcmp and pr_* calls that access | |
1727 | * strings in the section safe. | |
1728 | */ | |
1729 | info->secstrings = (void *)info->hdr + strhdr->sh_offset; | |
391e982b AD |
1730 | if (strhdr->sh_size == 0) { |
1731 | pr_err("empty section name table\n"); | |
1732 | goto no_exec; | |
1733 | } | |
7fd982f3 SK |
1734 | if (info->secstrings[strhdr->sh_size - 1] != '\0') { |
1735 | pr_err("ELF Spec violation: section name table isn't null terminated\n"); | |
1736 | goto no_exec; | |
1737 | } | |
ec2a2959 FL |
1738 | |
1739 | /* | |
1740 | * The code assumes that section 0 has a length of zero and | |
1741 | * an addr of zero, so check for it. | |
1742 | */ | |
1743 | if (info->sechdrs[0].sh_type != SHT_NULL | |
1744 | || info->sechdrs[0].sh_size != 0 | |
7fd982f3 SK |
1745 | || info->sechdrs[0].sh_addr != 0) { |
1746 | pr_err("ELF Spec violation: section 0 type(%d)!=SH_NULL or non-zero len or addr\n", | |
1747 | info->sechdrs[0].sh_type); | |
1748 | goto no_exec; | |
1749 | } | |
ec2a2959 FL |
1750 | |
1751 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
1752 | shdr = &info->sechdrs[i]; | |
1753 | switch (shdr->sh_type) { | |
1754 | case SHT_NULL: | |
1755 | case SHT_NOBITS: | |
1756 | continue; | |
1757 | case SHT_SYMTAB: | |
1758 | if (shdr->sh_link == SHN_UNDEF | |
7fd982f3 SK |
1759 | || shdr->sh_link >= info->hdr->e_shnum) { |
1760 | pr_err("Invalid ELF sh_link!=SHN_UNDEF(%d) or (sh_link(%d) >= hdr->e_shnum(%d)\n", | |
1761 | shdr->sh_link, shdr->sh_link, | |
1762 | info->hdr->e_shnum); | |
1763 | goto no_exec; | |
1764 | } | |
ec2a2959 FL |
1765 | fallthrough; |
1766 | default: | |
1767 | err = validate_section_offset(info, shdr); | |
1768 | if (err < 0) { | |
1769 | pr_err("Invalid ELF section in module (section %u type %u)\n", | |
1770 | i, shdr->sh_type); | |
1771 | return err; | |
1772 | } | |
1773 | ||
1774 | if (shdr->sh_flags & SHF_ALLOC) { | |
1775 | if (shdr->sh_name >= strhdr->sh_size) { | |
1776 | pr_err("Invalid ELF section name in module (section %u type %u)\n", | |
1777 | i, shdr->sh_type); | |
1778 | return -ENOEXEC; | |
1779 | } | |
1780 | } | |
1781 | break; | |
1782 | } | |
1783 | } | |
1784 | ||
34e1169d | 1785 | return 0; |
7fd982f3 SK |
1786 | |
1787 | no_exec: | |
1788 | return -ENOEXEC; | |
34e1169d KC |
1789 | } |
1790 | ||
3afe9f84 LT |
1791 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
1792 | ||
1793 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
1794 | { | |
1795 | do { | |
1796 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
1797 | ||
1798 | if (copy_from_user(dst, usrc, n) != 0) | |
1799 | return -EFAULT; | |
1800 | cond_resched(); | |
1801 | dst += n; | |
1802 | usrc += n; | |
1803 | len -= n; | |
1804 | } while (len); | |
1805 | return 0; | |
1806 | } | |
1807 | ||
2992ef29 | 1808 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 1809 | { |
1be9473e AT |
1810 | if (!get_modinfo(info, "livepatch")) |
1811 | /* Nothing more to do */ | |
1812 | return 0; | |
1813 | ||
1814 | if (set_livepatch_module(mod)) { | |
2992ef29 | 1815 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); |
7598d167 | 1816 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
1be9473e AT |
1817 | mod->name); |
1818 | return 0; | |
1ce15ef4 JY |
1819 | } |
1820 | ||
1be9473e AT |
1821 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", |
1822 | mod->name); | |
1823 | return -ENOEXEC; | |
1ce15ef4 | 1824 | } |
1ce15ef4 | 1825 | |
caf7501a AK |
1826 | static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
1827 | { | |
1828 | if (retpoline_module_ok(get_modinfo(info, "retpoline"))) | |
1829 | return; | |
1830 | ||
1831 | pr_warn("%s: loading module not compiled with retpoline compiler.\n", | |
1832 | mod->name); | |
1833 | } | |
1834 | ||
34e1169d KC |
1835 | /* Sets info->hdr and info->len. */ |
1836 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
1837 | struct load_info *info) | |
40dd2560 RR |
1838 | { |
1839 | int err; | |
40dd2560 | 1840 | |
34e1169d KC |
1841 | info->len = len; |
1842 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
1843 | return -ENOEXEC; |
1844 | ||
38f90173 | 1845 | err = security_kernel_load_data(LOADING_MODULE, true); |
2e72d51b KC |
1846 | if (err) |
1847 | return err; | |
1848 | ||
40dd2560 | 1849 | /* Suck in entire file: we'll want most of it. */ |
88dca4ca | 1850 | info->hdr = __vmalloc(info->len, GFP_KERNEL | __GFP_NOWARN); |
34e1169d | 1851 | if (!info->hdr) |
40dd2560 RR |
1852 | return -ENOMEM; |
1853 | ||
3afe9f84 | 1854 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
38f90173 KC |
1855 | err = -EFAULT; |
1856 | goto out; | |
40dd2560 RR |
1857 | } |
1858 | ||
38f90173 KC |
1859 | err = security_kernel_post_load_data((char *)info->hdr, info->len, |
1860 | LOADING_MODULE, "init_module"); | |
1861 | out: | |
1862 | if (err) | |
1863 | vfree(info->hdr); | |
1864 | ||
1865 | return err; | |
34e1169d KC |
1866 | } |
1867 | ||
b1ae6dc4 | 1868 | static void free_copy(struct load_info *info, int flags) |
d913188c | 1869 | { |
b1ae6dc4 DT |
1870 | if (flags & MODULE_INIT_COMPRESSED_FILE) |
1871 | module_decompress_cleanup(info); | |
1872 | else | |
1873 | vfree(info->hdr); | |
d913188c RR |
1874 | } |
1875 | ||
2f3238ae | 1876 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
1877 | { |
1878 | unsigned int i; | |
1879 | ||
1880 | /* This should always be true, but let's be sure. */ | |
1881 | info->sechdrs[0].sh_addr = 0; | |
1882 | ||
1883 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
1884 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
8b5f61a7 | 1885 | |
24b9f0d2 SS |
1886 | /* |
1887 | * Mark all sections sh_addr with their address in the | |
1888 | * temporary image. | |
1889 | */ | |
8b5f61a7 RR |
1890 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; |
1891 | ||
8b5f61a7 | 1892 | } |
d6df72a0 RR |
1893 | |
1894 | /* Track but don't keep modinfo and version sections. */ | |
3e2e857f | 1895 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
d6df72a0 | 1896 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 1897 | |
8b5f61a7 RR |
1898 | return 0; |
1899 | } | |
1900 | ||
3264d3f9 LT |
1901 | /* |
1902 | * Set up our basic convenience variables (pointers to section headers, | |
1903 | * search for module section index etc), and do some basic section | |
1904 | * verification. | |
1905 | * | |
81a0abd9 JY |
1906 | * Set info->mod to the temporary copy of the module in info->hdr. The final one |
1907 | * will be allocated in move_module(). | |
3264d3f9 | 1908 | */ |
81a0abd9 | 1909 | static int setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
1910 | { |
1911 | unsigned int i; | |
3264d3f9 | 1912 | |
5fdc7db6 JY |
1913 | /* Try to find a name early so we can log errors with a module name */ |
1914 | info->index.info = find_sec(info, ".modinfo"); | |
708e0ada | 1915 | if (info->index.info) |
5fdc7db6 | 1916 | info->name = get_modinfo(info, "name"); |
3264d3f9 | 1917 | |
8b5f61a7 RR |
1918 | /* Find internal symbols and strings. */ |
1919 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
1920 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
1921 | info->index.sym = i; | |
1922 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
1923 | info->strtab = (char *)info->hdr |
1924 | + info->sechdrs[info->index.str].sh_offset; | |
1925 | break; | |
3264d3f9 | 1926 | } |
3264d3f9 LT |
1927 | } |
1928 | ||
5fdc7db6 | 1929 | if (info->index.sym == 0) { |
708e0ada JY |
1930 | pr_warn("%s: module has no symbols (stripped?)\n", |
1931 | info->name ?: "(missing .modinfo section or name field)"); | |
5fdc7db6 JY |
1932 | return -ENOEXEC; |
1933 | } | |
1934 | ||
49668688 | 1935 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 1936 | if (!info->index.mod) { |
3e2e857f | 1937 | pr_warn("%s: No module found in object\n", |
708e0ada | 1938 | info->name ?: "(missing .modinfo section or name field)"); |
81a0abd9 | 1939 | return -ENOEXEC; |
3264d3f9 LT |
1940 | } |
1941 | /* This is temporary: point mod into copy of data. */ | |
5fdc7db6 | 1942 | info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
3264d3f9 | 1943 | |
3e2e857f | 1944 | /* |
5fdc7db6 | 1945 | * If we didn't load the .modinfo 'name' field earlier, fall back to |
3e2e857f KC |
1946 | * on-disk struct mod 'name' field. |
1947 | */ | |
1948 | if (!info->name) | |
81a0abd9 | 1949 | info->name = info->mod->name; |
3e2e857f | 1950 | |
5fdc7db6 JY |
1951 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
1952 | info->index.vers = 0; /* Pretend no __versions section! */ | |
1953 | else | |
1954 | info->index.vers = find_sec(info, "__versions"); | |
3264d3f9 | 1955 | |
49668688 | 1956 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 1957 | |
81a0abd9 | 1958 | return 0; |
3264d3f9 LT |
1959 | } |
1960 | ||
2f3238ae | 1961 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 1962 | { |
49668688 | 1963 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
1964 | int err; |
1965 | ||
2f3238ae RR |
1966 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
1967 | modmagic = NULL; | |
1968 | ||
40dd2560 RR |
1969 | /* This is allowed: modprobe --force will invalidate it. */ |
1970 | if (!modmagic) { | |
1971 | err = try_to_force_load(mod, "bad vermagic"); | |
1972 | if (err) | |
1973 | return err; | |
49668688 | 1974 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 1975 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 1976 | info->name, modmagic, vermagic); |
40dd2560 RR |
1977 | return -ENOEXEC; |
1978 | } | |
1979 | ||
3205c36c LP |
1980 | if (!get_modinfo(info, "intree")) { |
1981 | if (!test_taint(TAINT_OOT_MODULE)) | |
1982 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
1983 | mod->name); | |
373d4d09 | 1984 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 1985 | } |
2449b8ba | 1986 | |
caf7501a AK |
1987 | check_modinfo_retpoline(mod, info); |
1988 | ||
49668688 | 1989 | if (get_modinfo(info, "staging")) { |
373d4d09 | 1990 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
1991 | pr_warn("%s: module is from the staging directory, the quality " |
1992 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 1993 | } |
22e268eb | 1994 | |
2992ef29 | 1995 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
1996 | if (err) |
1997 | return err; | |
1998 | ||
22e268eb | 1999 | /* Set up license info based on the info section */ |
49668688 | 2000 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2001 | |
74829ddf DG |
2002 | if (get_modinfo(info, "test")) { |
2003 | if (!test_taint(TAINT_TEST)) | |
2004 | pr_warn("%s: loading test module taints kernel.\n", | |
2005 | mod->name); | |
2006 | add_taint_module(mod, TAINT_TEST, LOCKDEP_STILL_OK); | |
2007 | } | |
2008 | ||
40dd2560 RR |
2009 | return 0; |
2010 | } | |
2011 | ||
eb3057df | 2012 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2013 | { |
49668688 | 2014 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2015 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2016 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2017 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2018 | mod->crcs = section_addr(info, "__kcrctab"); |
2019 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2020 | sizeof(*mod->gpl_syms), |
2021 | &mod->num_gpl_syms); | |
49668688 | 2022 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
f91a13bb | 2023 | |
f91a13bb | 2024 | #ifdef CONFIG_CONSTRUCTORS |
49668688 | 2025 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 2026 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
2027 | if (!mod->ctors) |
2028 | mod->ctors = section_objs(info, ".init_array", | |
2029 | sizeof(*mod->ctors), &mod->num_ctors); | |
2030 | else if (find_sec(info, ".init_array")) { | |
2031 | /* | |
2032 | * This shouldn't happen with same compiler and binutils | |
2033 | * building all parts of the module. | |
2034 | */ | |
6da0b565 | 2035 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
2036 | mod->name); |
2037 | return -EINVAL; | |
2038 | } | |
f91a13bb LT |
2039 | #endif |
2040 | ||
66e9b071 TG |
2041 | mod->noinstr_text_start = section_objs(info, ".noinstr.text", 1, |
2042 | &mod->noinstr_text_size); | |
2043 | ||
f91a13bb | 2044 | #ifdef CONFIG_TRACEPOINTS |
65498646 MD |
2045 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2046 | sizeof(*mod->tracepoints_ptrs), | |
2047 | &mod->num_tracepoints); | |
f91a13bb | 2048 | #endif |
fe15b50c PM |
2049 | #ifdef CONFIG_TREE_SRCU |
2050 | mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", | |
2051 | sizeof(*mod->srcu_struct_ptrs), | |
2052 | &mod->num_srcu_structs); | |
2053 | #endif | |
a38d1107 MM |
2054 | #ifdef CONFIG_BPF_EVENTS |
2055 | mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", | |
2056 | sizeof(*mod->bpf_raw_events), | |
2057 | &mod->num_bpf_raw_events); | |
2058 | #endif | |
36e68442 AN |
2059 | #ifdef CONFIG_DEBUG_INFO_BTF_MODULES |
2060 | mod->btf_data = any_section_objs(info, ".BTF", 1, &mod->btf_data_size); | |
2061 | #endif | |
e9666d10 | 2062 | #ifdef CONFIG_JUMP_LABEL |
bf5438fc JB |
2063 | mod->jump_entries = section_objs(info, "__jump_table", |
2064 | sizeof(*mod->jump_entries), | |
2065 | &mod->num_jump_entries); | |
2066 | #endif | |
f91a13bb | 2067 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2068 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2069 | sizeof(*mod->trace_events), |
2070 | &mod->num_trace_events); | |
99be647c JL |
2071 | mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
2072 | sizeof(*mod->trace_evals), | |
2073 | &mod->num_trace_evals); | |
f91a13bb | 2074 | #endif |
13b9b6e7 SR |
2075 | #ifdef CONFIG_TRACING |
2076 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2077 | sizeof(*mod->trace_bprintk_fmt_start), | |
2078 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 2079 | #endif |
f91a13bb LT |
2080 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2081 | /* sechdrs[0].sh_size is always zero */ | |
a1326b17 | 2082 | mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION, |
f91a13bb LT |
2083 | sizeof(*mod->ftrace_callsites), |
2084 | &mod->num_ftrace_callsites); | |
2085 | #endif | |
540adea3 MH |
2086 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
2087 | mod->ei_funcs = section_objs(info, "_error_injection_whitelist", | |
2088 | sizeof(*mod->ei_funcs), | |
2089 | &mod->num_ei_funcs); | |
1e6769b0 MH |
2090 | #endif |
2091 | #ifdef CONFIG_KPROBES | |
2092 | mod->kprobes_text_start = section_objs(info, ".kprobes.text", 1, | |
2093 | &mod->kprobes_text_size); | |
16db6264 MH |
2094 | mod->kprobe_blacklist = section_objs(info, "_kprobe_blacklist", |
2095 | sizeof(unsigned long), | |
2096 | &mod->num_kprobe_blacklist); | |
9183c3f9 | 2097 | #endif |
33701557 CD |
2098 | #ifdef CONFIG_PRINTK_INDEX |
2099 | mod->printk_index_start = section_objs(info, ".printk_index", | |
2100 | sizeof(*mod->printk_index_start), | |
2101 | &mod->printk_index_size); | |
2102 | #endif | |
9183c3f9 JP |
2103 | #ifdef CONFIG_HAVE_STATIC_CALL_INLINE |
2104 | mod->static_call_sites = section_objs(info, ".static_call_sites", | |
2105 | sizeof(*mod->static_call_sites), | |
2106 | &mod->num_static_call_sites); | |
92ace999 | 2107 | #endif |
41a55567 | 2108 | #if IS_ENABLED(CONFIG_KUNIT) |
3d6e4462 JK |
2109 | mod->kunit_suites = section_objs(info, ".kunit_test_suites", |
2110 | sizeof(*mod->kunit_suites), | |
2111 | &mod->num_kunit_suites); | |
2112 | #endif | |
2113 | ||
811d66a0 RR |
2114 | mod->extable = section_objs(info, "__ex_table", |
2115 | sizeof(*mod->extable), &mod->num_exentries); | |
2116 | ||
49668688 | 2117 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 2118 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 | 2119 | |
b7b4eebd JC |
2120 | info->dyndbg.descs = section_objs(info, "__dyndbg", |
2121 | sizeof(*info->dyndbg.descs), &info->dyndbg.num_descs); | |
66f4006b JC |
2122 | info->dyndbg.classes = section_objs(info, "__dyndbg_classes", |
2123 | sizeof(*info->dyndbg.classes), &info->dyndbg.num_classes); | |
eb3057df FH |
2124 | |
2125 | return 0; | |
f91a13bb LT |
2126 | } |
2127 | ||
49668688 | 2128 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2129 | { |
2130 | int i; | |
2131 | void *ptr; | |
2132 | ||
2133 | /* Do the allocs. */ | |
7523e4dc | 2134 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
2135 | /* |
2136 | * The pointer to this block is stored in the module structure | |
2137 | * which is inside the block. Just mark it as not being a | |
2138 | * leak. | |
2139 | */ | |
2140 | kmemleak_not_leak(ptr); | |
2141 | if (!ptr) | |
d913188c | 2142 | return -ENOMEM; |
65b8a9b4 | 2143 | |
7523e4dc RR |
2144 | memset(ptr, 0, mod->core_layout.size); |
2145 | mod->core_layout.base = ptr; | |
65b8a9b4 | 2146 | |
7523e4dc RR |
2147 | if (mod->init_layout.size) { |
2148 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
2149 | /* |
2150 | * The pointer to this block is stored in the module structure | |
2151 | * which is inside the block. This block doesn't need to be | |
2152 | * scanned as it contains data and code that will be freed | |
2153 | * after the module is initialized. | |
2154 | */ | |
2155 | kmemleak_ignore(ptr); | |
2156 | if (!ptr) { | |
7523e4dc | 2157 | module_memfree(mod->core_layout.base); |
82fab442 RR |
2158 | return -ENOMEM; |
2159 | } | |
7523e4dc RR |
2160 | memset(ptr, 0, mod->init_layout.size); |
2161 | mod->init_layout.base = ptr; | |
82fab442 | 2162 | } else |
7523e4dc | 2163 | mod->init_layout.base = NULL; |
65b8a9b4 | 2164 | |
01dc0386 CL |
2165 | #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC |
2166 | /* Do the allocs. */ | |
2b9401e9 | 2167 | ptr = vzalloc(mod->data_layout.size); |
01dc0386 CL |
2168 | /* |
2169 | * The pointer to this block is stored in the module structure | |
2170 | * which is inside the block. Just mark it as not being a | |
2171 | * leak. | |
2172 | */ | |
2173 | kmemleak_not_leak(ptr); | |
2174 | if (!ptr) { | |
2175 | module_memfree(mod->core_layout.base); | |
2176 | module_memfree(mod->init_layout.base); | |
2177 | return -ENOMEM; | |
2178 | } | |
2179 | ||
01dc0386 CL |
2180 | mod->data_layout.base = ptr; |
2181 | #endif | |
65b8a9b4 | 2182 | /* Transfer each section which specifies SHF_ALLOC */ |
5e124169 | 2183 | pr_debug("final section addresses:\n"); |
49668688 | 2184 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2185 | void *dest; |
49668688 | 2186 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2187 | |
49668688 | 2188 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2189 | continue; |
2190 | ||
49668688 | 2191 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 2192 | dest = mod->init_layout.base |
49668688 | 2193 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
6ab9942c CL |
2194 | else if (!(shdr->sh_flags & SHF_EXECINSTR)) |
2195 | dest = mod->data_layout.base + shdr->sh_entsize; | |
65b8a9b4 | 2196 | else |
7523e4dc | 2197 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 2198 | |
49668688 RR |
2199 | if (shdr->sh_type != SHT_NOBITS) |
2200 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 2201 | /* Update sh_addr to point to copy in image. */ |
49668688 | 2202 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
2203 | pr_debug("\t0x%lx %s\n", |
2204 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 2205 | } |
d913188c RR |
2206 | |
2207 | return 0; | |
65b8a9b4 LT |
2208 | } |
2209 | ||
49668688 | 2210 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 2211 | { |
3205c36c LP |
2212 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
2213 | ||
22e268eb RR |
2214 | /* |
2215 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2216 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2217 | * using GPL-only symbols it needs. | |
2218 | */ | |
2219 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 2220 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
2221 | |
2222 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2223 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
2224 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2225 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 2226 | |
c99af375 MG |
2227 | /* lve claims to be GPL but upstream won't provide source */ |
2228 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
2229 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2230 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 2231 | |
3205c36c LP |
2232 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
2233 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
2234 | ||
22e268eb | 2235 | #ifdef CONFIG_MODVERSIONS |
36794822 CH |
2236 | if ((mod->num_syms && !mod->crcs) || |
2237 | (mod->num_gpl_syms && !mod->gpl_crcs)) { | |
22e268eb RR |
2238 | return try_to_force_load(mod, |
2239 | "no versions for exported symbols"); | |
2240 | } | |
2241 | #endif | |
2242 | return 0; | |
2243 | } | |
2244 | ||
2245 | static void flush_module_icache(const struct module *mod) | |
2246 | { | |
22e268eb RR |
2247 | /* |
2248 | * Flush the instruction cache, since we've played with text. | |
2249 | * Do it before processing of module parameters, so the module | |
2250 | * can provide parameter accessor functions of its own. | |
2251 | */ | |
7523e4dc RR |
2252 | if (mod->init_layout.base) |
2253 | flush_icache_range((unsigned long)mod->init_layout.base, | |
2254 | (unsigned long)mod->init_layout.base | |
2255 | + mod->init_layout.size); | |
2256 | flush_icache_range((unsigned long)mod->core_layout.base, | |
2257 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
2258 | } |
2259 | ||
f9231a99 NP |
2260 | bool __weak module_elf_check_arch(Elf_Ehdr *hdr) |
2261 | { | |
2262 | return true; | |
2263 | } | |
2264 | ||
74e08fcf JB |
2265 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
2266 | Elf_Shdr *sechdrs, | |
2267 | char *secstrings, | |
2268 | struct module *mod) | |
2269 | { | |
2270 | return 0; | |
2271 | } | |
2272 | ||
be7de5f9 PB |
2273 | /* module_blacklist is a comma-separated list of module names */ |
2274 | static char *module_blacklist; | |
96b5b194 | 2275 | static bool blacklisted(const char *module_name) |
be7de5f9 PB |
2276 | { |
2277 | const char *p; | |
2278 | size_t len; | |
2279 | ||
2280 | if (!module_blacklist) | |
2281 | return false; | |
2282 | ||
2283 | for (p = module_blacklist; *p; p += len) { | |
2284 | len = strcspn(p, ","); | |
2285 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
2286 | return true; | |
2287 | if (p[len] == ',') | |
2288 | len++; | |
2289 | } | |
2290 | return false; | |
2291 | } | |
2292 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
2293 | ||
2f3238ae | 2294 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 2295 | { |
1da177e4 | 2296 | struct module *mod; |
444d13ff | 2297 | unsigned int ndx; |
d913188c | 2298 | int err; |
3ae91c21 | 2299 | |
81a0abd9 | 2300 | err = check_modinfo(info->mod, info, flags); |
40dd2560 RR |
2301 | if (err) |
2302 | return ERR_PTR(err); | |
1da177e4 | 2303 | |
1da177e4 | 2304 | /* Allow arches to frob section contents and sizes. */ |
49668688 | 2305 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
81a0abd9 | 2306 | info->secstrings, info->mod); |
1da177e4 | 2307 | if (err < 0) |
8d8022e8 | 2308 | return ERR_PTR(err); |
1da177e4 | 2309 | |
5c3a7db0 PZ |
2310 | err = module_enforce_rwx_sections(info->hdr, info->sechdrs, |
2311 | info->secstrings, info->mod); | |
2312 | if (err < 0) | |
2313 | return ERR_PTR(err); | |
2314 | ||
8d8022e8 RR |
2315 | /* We will do a special allocation for per-cpu sections later. */ |
2316 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 2317 | |
444d13ff JY |
2318 | /* |
2319 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
2320 | * layout_sections() can put it in the right place. | |
2321 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
2322 | */ | |
2323 | ndx = find_sec(info, ".data..ro_after_init"); | |
e872267b AB |
2324 | if (ndx) |
2325 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
2326 | /* | |
2327 | * Mark the __jump_table section as ro_after_init as well: these data | |
2328 | * structures are never modified, with the exception of entries that | |
2329 | * refer to code in the __init section, which are annotated as such | |
2330 | * at module load time. | |
2331 | */ | |
2332 | ndx = find_sec(info, "__jump_table"); | |
444d13ff JY |
2333 | if (ndx) |
2334 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
2335 | ||
24b9f0d2 SS |
2336 | /* |
2337 | * Determine total sizes, and put offsets in sh_entsize. For now | |
2338 | * this is done generically; there doesn't appear to be any | |
2339 | * special cases for the architectures. | |
2340 | */ | |
81a0abd9 JY |
2341 | layout_sections(info->mod, info); |
2342 | layout_symtab(info->mod, info); | |
1da177e4 | 2343 | |
65b8a9b4 | 2344 | /* Allocate and move to the final place */ |
81a0abd9 | 2345 | err = move_module(info->mod, info); |
d913188c | 2346 | if (err) |
8d8022e8 | 2347 | return ERR_PTR(err); |
d913188c RR |
2348 | |
2349 | /* Module has been copied to its final place now: return it. */ | |
2350 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 2351 | kmemleak_load_module(mod, info); |
d913188c | 2352 | return mod; |
d913188c RR |
2353 | } |
2354 | ||
2355 | /* mod is no longer valid after this! */ | |
2356 | static void module_deallocate(struct module *mod, struct load_info *info) | |
2357 | { | |
d913188c | 2358 | percpu_modfree(mod); |
d453cded | 2359 | module_arch_freeing_init(mod); |
7523e4dc RR |
2360 | module_memfree(mod->init_layout.base); |
2361 | module_memfree(mod->core_layout.base); | |
01dc0386 CL |
2362 | #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC |
2363 | vfree(mod->data_layout.base); | |
2364 | #endif | |
d913188c RR |
2365 | } |
2366 | ||
74e08fcf JB |
2367 | int __weak module_finalize(const Elf_Ehdr *hdr, |
2368 | const Elf_Shdr *sechdrs, | |
2369 | struct module *me) | |
2370 | { | |
2371 | return 0; | |
2372 | } | |
2373 | ||
811d66a0 RR |
2374 | static int post_relocation(struct module *mod, const struct load_info *info) |
2375 | { | |
51f3d0f4 | 2376 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
2377 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
2378 | ||
2379 | /* Copy relocated percpu area over. */ | |
2380 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
2381 | info->sechdrs[info->index.pcpu].sh_size); | |
2382 | ||
51f3d0f4 | 2383 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
2384 | add_kallsyms(mod, info); |
2385 | ||
2386 | /* Arch-specific module finalizing. */ | |
2387 | return module_finalize(info->hdr, info->sechdrs, mod); | |
2388 | } | |
2389 | ||
9bb9c3be RR |
2390 | /* Is this module of this name done loading? No locks held. */ |
2391 | static bool finished_loading(const char *name) | |
2392 | { | |
2393 | struct module *mod; | |
2394 | bool ret; | |
2395 | ||
9cc019b8 PZ |
2396 | /* |
2397 | * The module_mutex should not be a heavily contended lock; | |
2398 | * if we get the occasional sleep here, we'll go an extra iteration | |
2399 | * in the wait_event_interruptible(), which is harmless. | |
2400 | */ | |
2401 | sched_annotate_sleep(); | |
9bb9c3be | 2402 | mutex_lock(&module_mutex); |
4f6de4d5 | 2403 | mod = find_module_all(name, strlen(name), true); |
0254127a PP |
2404 | ret = !mod || mod->state == MODULE_STATE_LIVE |
2405 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
2406 | mutex_unlock(&module_mutex); |
2407 | ||
2408 | return ret; | |
2409 | } | |
2410 | ||
34e1169d KC |
2411 | /* Call module constructors. */ |
2412 | static void do_mod_ctors(struct module *mod) | |
2413 | { | |
2414 | #ifdef CONFIG_CONSTRUCTORS | |
2415 | unsigned long i; | |
2416 | ||
2417 | for (i = 0; i < mod->num_ctors; i++) | |
2418 | mod->ctors[i](); | |
2419 | #endif | |
2420 | } | |
2421 | ||
c7496379 RR |
2422 | /* For freeing module_init on success, in case kallsyms traversing */ |
2423 | struct mod_initfree { | |
1a7b7d92 | 2424 | struct llist_node node; |
c7496379 RR |
2425 | void *module_init; |
2426 | }; | |
2427 | ||
1a7b7d92 | 2428 | static void do_free_init(struct work_struct *w) |
c7496379 | 2429 | { |
1a7b7d92 RE |
2430 | struct llist_node *pos, *n, *list; |
2431 | struct mod_initfree *initfree; | |
2432 | ||
2433 | list = llist_del_all(&init_free_list); | |
2434 | ||
2435 | synchronize_rcu(); | |
2436 | ||
2437 | llist_for_each_safe(pos, n, list) { | |
2438 | initfree = container_of(pos, struct mod_initfree, node); | |
2439 | module_memfree(initfree->module_init); | |
2440 | kfree(initfree); | |
2441 | } | |
c7496379 RR |
2442 | } |
2443 | ||
ae39e9ed SK |
2444 | #undef MODULE_PARAM_PREFIX |
2445 | #define MODULE_PARAM_PREFIX "module." | |
2446 | /* Default value for module->async_probe_requested */ | |
2447 | static bool async_probe; | |
2448 | module_param(async_probe, bool, 0644); | |
2449 | ||
be02a186 JK |
2450 | /* |
2451 | * This is where the real work happens. | |
2452 | * | |
2453 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
2454 | * helper command 'lx-symbols'. | |
2455 | */ | |
2456 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
2457 | { |
2458 | int ret = 0; | |
c7496379 RR |
2459 | struct mod_initfree *freeinit; |
2460 | ||
2461 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
2462 | if (!freeinit) { | |
2463 | ret = -ENOMEM; | |
2464 | goto fail; | |
2465 | } | |
7523e4dc | 2466 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 2467 | |
34e1169d KC |
2468 | do_mod_ctors(mod); |
2469 | /* Start the module */ | |
2470 | if (mod->init != NULL) | |
2471 | ret = do_one_initcall(mod->init); | |
2472 | if (ret < 0) { | |
c7496379 | 2473 | goto fail_free_freeinit; |
34e1169d KC |
2474 | } |
2475 | if (ret > 0) { | |
bddb12b3 AM |
2476 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
2477 | "follow 0/-E convention\n" | |
2478 | "%s: loading module anyway...\n", | |
2479 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
2480 | dump_stack(); |
2481 | } | |
2482 | ||
2483 | /* Now it's a first class citizen! */ | |
2484 | mod->state = MODULE_STATE_LIVE; | |
2485 | blocking_notifier_call_chain(&module_notify_list, | |
2486 | MODULE_STATE_LIVE, mod); | |
2487 | ||
38dc717e JY |
2488 | /* Delay uevent until module has finished its init routine */ |
2489 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); | |
2490 | ||
774a1221 TH |
2491 | /* |
2492 | * We need to finish all async code before the module init sequence | |
67d6212a IP |
2493 | * is done. This has potential to deadlock if synchronous module |
2494 | * loading is requested from async (which is not allowed!). | |
774a1221 | 2495 | * |
67d6212a IP |
2496 | * See commit 0fdff3ec6d87 ("async, kmod: warn on synchronous |
2497 | * request_module() from async workers") for more details. | |
774a1221 | 2498 | */ |
67d6212a | 2499 | if (!mod->async_probe_requested) |
774a1221 | 2500 | async_synchronize_full(); |
34e1169d | 2501 | |
aba4b5c2 | 2502 | ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
3e234289 | 2503 | mod->init_layout.size); |
34e1169d KC |
2504 | mutex_lock(&module_mutex); |
2505 | /* Drop initial reference. */ | |
2506 | module_put(mod); | |
2507 | trim_init_extable(mod); | |
2508 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
2509 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
2510 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 2511 | #endif |
444d13ff | 2512 | module_enable_ro(mod, true); |
93c2e105 | 2513 | mod_tree_remove_init(mod); |
d453cded | 2514 | module_arch_freeing_init(mod); |
7523e4dc RR |
2515 | mod->init_layout.base = NULL; |
2516 | mod->init_layout.size = 0; | |
2517 | mod->init_layout.ro_size = 0; | |
444d13ff | 2518 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 2519 | mod->init_layout.text_size = 0; |
607c543f AN |
2520 | #ifdef CONFIG_DEBUG_INFO_BTF_MODULES |
2521 | /* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */ | |
2522 | mod->btf_data = NULL; | |
607c543f | 2523 | #endif |
c7496379 RR |
2524 | /* |
2525 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be | 2526 | * walking this with preempt disabled. In all the failure paths, we |
cb2f5536 | 2527 | * call synchronize_rcu(), but we don't want to slow down the success |
1a7b7d92 RE |
2528 | * path. module_memfree() cannot be called in an interrupt, so do the |
2529 | * work and call synchronize_rcu() in a work queue. | |
2530 | * | |
ae646f0b JH |
2531 | * Note that module_alloc() on most architectures creates W+X page |
2532 | * mappings which won't be cleaned up until do_free_init() runs. Any | |
2533 | * code such as mark_rodata_ro() which depends on those mappings to | |
2534 | * be cleaned up needs to sync with the queued work - ie | |
cb2f5536 | 2535 | * rcu_barrier() |
c7496379 | 2536 | */ |
1a7b7d92 RE |
2537 | if (llist_add(&freeinit->node, &init_free_list)) |
2538 | schedule_work(&init_free_wq); | |
2539 | ||
34e1169d KC |
2540 | mutex_unlock(&module_mutex); |
2541 | wake_up_all(&module_wq); | |
2542 | ||
2543 | return 0; | |
c7496379 RR |
2544 | |
2545 | fail_free_freeinit: | |
2546 | kfree(freeinit); | |
2547 | fail: | |
2548 | /* Try to protect us from buggy refcounters. */ | |
2549 | mod->state = MODULE_STATE_GOING; | |
cb2f5536 | 2550 | synchronize_rcu(); |
c7496379 RR |
2551 | module_put(mod); |
2552 | blocking_notifier_call_chain(&module_notify_list, | |
2553 | MODULE_STATE_GOING, mod); | |
7e545d6e | 2554 | klp_module_going(mod); |
7dcd182b | 2555 | ftrace_release_mod(mod); |
c7496379 RR |
2556 | free_module(mod); |
2557 | wake_up_all(&module_wq); | |
2558 | return ret; | |
34e1169d KC |
2559 | } |
2560 | ||
2561 | static int may_init_module(void) | |
2562 | { | |
2563 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
2564 | return -EPERM; | |
2565 | ||
2566 | return 0; | |
2567 | } | |
2568 | ||
a3535c7e RR |
2569 | /* |
2570 | * We try to place it in the list now to make sure it's unique before | |
2571 | * we dedicate too many resources. In particular, temporary percpu | |
2572 | * memory exhaustion. | |
2573 | */ | |
2574 | static int add_unformed_module(struct module *mod) | |
2575 | { | |
2576 | int err; | |
2577 | struct module *old; | |
2578 | ||
2579 | mod->state = MODULE_STATE_UNFORMED; | |
2580 | ||
a3535c7e | 2581 | mutex_lock(&module_mutex); |
4f6de4d5 MK |
2582 | old = find_module_all(mod->name, strlen(mod->name), true); |
2583 | if (old != NULL) { | |
0254127a PP |
2584 | if (old->state == MODULE_STATE_COMING |
2585 | || old->state == MODULE_STATE_UNFORMED) { | |
a3535c7e RR |
2586 | /* Wait in case it fails to load. */ |
2587 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
2588 | err = wait_event_interruptible(module_wq, |
2589 | finished_loading(mod->name)); | |
a3535c7e RR |
2590 | if (err) |
2591 | goto out_unlocked; | |
0254127a PP |
2592 | |
2593 | /* The module might have gone in the meantime. */ | |
2594 | mutex_lock(&module_mutex); | |
2595 | old = find_module_all(mod->name, strlen(mod->name), | |
2596 | true); | |
a3535c7e | 2597 | } |
0254127a PP |
2598 | |
2599 | /* | |
2600 | * We are here only when the same module was being loaded. Do | |
2601 | * not try to load it again right now. It prevents long delays | |
2602 | * caused by serialized module load failures. It might happen | |
2603 | * when more devices of the same type trigger load of | |
2604 | * a particular module. | |
2605 | */ | |
2606 | if (old && old->state == MODULE_STATE_LIVE) | |
2607 | err = -EEXIST; | |
2608 | else | |
2609 | err = -EBUSY; | |
a3535c7e RR |
2610 | goto out; |
2611 | } | |
4f666546 | 2612 | mod_update_bounds(mod); |
a3535c7e | 2613 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 2614 | mod_tree_insert(mod); |
a3535c7e RR |
2615 | err = 0; |
2616 | ||
2617 | out: | |
2618 | mutex_unlock(&module_mutex); | |
2619 | out_unlocked: | |
2620 | return err; | |
2621 | } | |
2622 | ||
2623 | static int complete_formation(struct module *mod, struct load_info *info) | |
2624 | { | |
2625 | int err; | |
2626 | ||
2627 | mutex_lock(&module_mutex); | |
2628 | ||
2629 | /* Find duplicate symbols (must be called under lock). */ | |
2d25bc55 | 2630 | err = verify_exported_symbols(mod); |
a3535c7e RR |
2631 | if (err < 0) |
2632 | goto out; | |
2633 | ||
89245600 | 2634 | /* These rely on module_mutex for list integrity. */ |
a3535c7e | 2635 | module_bug_finalize(info->hdr, info->sechdrs, mod); |
89245600 | 2636 | module_cfi_finalize(info->hdr, info->sechdrs, mod); |
a3535c7e | 2637 | |
ef505058 CL |
2638 | if (module_check_misalignment(mod)) |
2639 | goto out_misaligned; | |
2640 | ||
444d13ff | 2641 | module_enable_ro(mod, false); |
85c898db | 2642 | module_enable_nx(mod); |
af742623 | 2643 | module_enable_x(mod); |
4982223e | 2644 | |
24b9f0d2 SS |
2645 | /* |
2646 | * Mark state as coming so strong_try_module_get() ignores us, | |
2647 | * but kallsyms etc. can see us. | |
2648 | */ | |
a3535c7e | 2649 | mod->state = MODULE_STATE_COMING; |
4982223e RR |
2650 | mutex_unlock(&module_mutex); |
2651 | ||
4982223e | 2652 | return 0; |
a3535c7e | 2653 | |
ef505058 CL |
2654 | out_misaligned: |
2655 | err = -EINVAL; | |
a3535c7e RR |
2656 | out: |
2657 | mutex_unlock(&module_mutex); | |
2658 | return err; | |
2659 | } | |
2660 | ||
4c973d16 JY |
2661 | static int prepare_coming_module(struct module *mod) |
2662 | { | |
7e545d6e JY |
2663 | int err; |
2664 | ||
4c973d16 | 2665 | ftrace_module_enable(mod); |
7e545d6e JY |
2666 | err = klp_module_coming(mod); |
2667 | if (err) | |
2668 | return err; | |
2669 | ||
59cc8e0a PZ |
2670 | err = blocking_notifier_call_chain_robust(&module_notify_list, |
2671 | MODULE_STATE_COMING, MODULE_STATE_GOING, mod); | |
2672 | err = notifier_to_errno(err); | |
2673 | if (err) | |
2674 | klp_module_going(mod); | |
2675 | ||
2676 | return err; | |
4c973d16 JY |
2677 | } |
2678 | ||
ecc86170 LR |
2679 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
2680 | void *arg) | |
54041d8a | 2681 | { |
f2411da7 LR |
2682 | struct module *mod = arg; |
2683 | int ret; | |
2684 | ||
2685 | if (strcmp(param, "async_probe") == 0) { | |
ae39e9ed SK |
2686 | if (strtobool(val, &mod->async_probe_requested)) |
2687 | mod->async_probe_requested = true; | |
f2411da7 LR |
2688 | return 0; |
2689 | } | |
2690 | ||
6da0b565 | 2691 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 2692 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
2693 | if (ret != 0) |
2694 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
2695 | return 0; |
2696 | } | |
2697 | ||
24b9f0d2 SS |
2698 | /* |
2699 | * Allocate and load the module: note that size of section 0 is always | |
2700 | * zero, and we rely on this for optional sections. | |
2701 | */ | |
2f3238ae RR |
2702 | static int load_module(struct load_info *info, const char __user *uargs, |
2703 | int flags) | |
d913188c | 2704 | { |
a3535c7e | 2705 | struct module *mod; |
5fdc7db6 | 2706 | long err = 0; |
51e158c1 | 2707 | char *after_dashes; |
d913188c | 2708 | |
ec2a2959 FL |
2709 | /* |
2710 | * Do the signature check (if any) first. All that | |
2711 | * the signature check needs is info->len, it does | |
2712 | * not need any of the section info. That can be | |
2713 | * set up later. This will minimize the chances | |
2714 | * of a corrupt module causing problems before | |
2715 | * we even get to the signature check. | |
2716 | * | |
2717 | * The check will also adjust info->len by stripping | |
2718 | * off the sig length at the end of the module, making | |
2719 | * checks against info->len more correct. | |
2720 | */ | |
2721 | err = module_sig_check(info, flags); | |
2722 | if (err) | |
2723 | goto free_copy; | |
2724 | ||
2725 | /* | |
2726 | * Do basic sanity checks against the ELF header and | |
2727 | * sections. | |
2728 | */ | |
2729 | err = elf_validity_check(info); | |
7fd982f3 | 2730 | if (err) |
5fdc7db6 JY |
2731 | goto free_copy; |
2732 | ||
ec2a2959 FL |
2733 | /* |
2734 | * Everything checks out, so set up the section info | |
2735 | * in the info structure. | |
2736 | */ | |
5fdc7db6 JY |
2737 | err = setup_load_info(info, flags); |
2738 | if (err) | |
2739 | goto free_copy; | |
2740 | ||
ec2a2959 FL |
2741 | /* |
2742 | * Now that we know we have the correct module name, check | |
2743 | * if it's blacklisted. | |
2744 | */ | |
5fdc7db6 JY |
2745 | if (blacklisted(info->name)) { |
2746 | err = -EPERM; | |
14721add | 2747 | pr_err("Module %s is blacklisted\n", info->name); |
5fdc7db6 JY |
2748 | goto free_copy; |
2749 | } | |
2750 | ||
5fdc7db6 | 2751 | err = rewrite_section_headers(info, flags); |
d913188c | 2752 | if (err) |
34e1169d | 2753 | goto free_copy; |
d913188c | 2754 | |
5fdc7db6 JY |
2755 | /* Check module struct version now, before we try to use module. */ |
2756 | if (!check_modstruct_version(info, info->mod)) { | |
2757 | err = -ENOEXEC; | |
2758 | goto free_copy; | |
2759 | } | |
2760 | ||
d913188c | 2761 | /* Figure out module layout, and allocate all the memory. */ |
2f3238ae | 2762 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
2763 | if (IS_ERR(mod)) { |
2764 | err = PTR_ERR(mod); | |
d913188c | 2765 | goto free_copy; |
1da177e4 | 2766 | } |
1da177e4 | 2767 | |
ca86cad7 RGB |
2768 | audit_log_kern_module(mod->name); |
2769 | ||
a3535c7e RR |
2770 | /* Reserve our place in the list. */ |
2771 | err = add_unformed_module(mod); | |
2772 | if (err) | |
1fb9341a | 2773 | goto free_module; |
1fb9341a | 2774 | |
106a4ee2 | 2775 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2776 | mod->sig_ok = info->sig_ok; |
64748a2c | 2777 | if (!mod->sig_ok) { |
bddb12b3 | 2778 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 2779 | "and/or required key missing - tainting " |
bddb12b3 | 2780 | "kernel\n", mod->name); |
66cc69e3 | 2781 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 2782 | } |
106a4ee2 RR |
2783 | #endif |
2784 | ||
8d8022e8 | 2785 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 2786 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
2787 | if (err) |
2788 | goto unlink_mod; | |
2789 | ||
49668688 | 2790 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
2791 | err = module_unload_init(mod); |
2792 | if (err) | |
1fb9341a | 2793 | goto unlink_mod; |
1da177e4 | 2794 | |
cf2fde7b | 2795 | init_param_lock(mod); |
b51d23e4 | 2796 | |
24b9f0d2 SS |
2797 | /* |
2798 | * Now we've got everything in the final locations, we can | |
2799 | * find optional sections. | |
2800 | */ | |
eb3057df FH |
2801 | err = find_module_sections(mod, info); |
2802 | if (err) | |
2803 | goto free_unload; | |
9b37ccfc | 2804 | |
49668688 | 2805 | err = check_module_license_and_versions(mod); |
22e268eb RR |
2806 | if (err) |
2807 | goto free_unload; | |
9841d61d | 2808 | |
c988d2b2 | 2809 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 2810 | setup_modinfo(mod, info); |
c988d2b2 | 2811 | |
1da177e4 | 2812 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 2813 | err = simplify_symbols(mod, info); |
1da177e4 | 2814 | if (err < 0) |
d913188c | 2815 | goto free_modinfo; |
1da177e4 | 2816 | |
34e1169d | 2817 | err = apply_relocations(mod, info); |
22e268eb | 2818 | if (err < 0) |
d913188c | 2819 | goto free_modinfo; |
1da177e4 | 2820 | |
34e1169d | 2821 | err = post_relocation(mod, info); |
1da177e4 | 2822 | if (err < 0) |
d913188c | 2823 | goto free_modinfo; |
1da177e4 | 2824 | |
22e268eb | 2825 | flush_module_icache(mod); |
378bac82 | 2826 | |
6526c534 RR |
2827 | /* Now copy in args */ |
2828 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
2829 | if (IS_ERR(mod->args)) { | |
2830 | err = PTR_ERR(mod->args); | |
2831 | goto free_arch_cleanup; | |
2832 | } | |
8d3b33f6 | 2833 | |
9294523e | 2834 | init_build_id(mod, info); |
b7b4eebd | 2835 | dynamic_debug_setup(mod, &info->dyndbg); |
ff49d74a | 2836 | |
a949ae56 SRRH |
2837 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
2838 | ftrace_module_init(mod); | |
2839 | ||
a3535c7e RR |
2840 | /* Finally it's fully formed, ready to start executing. */ |
2841 | err = complete_formation(mod, info); | |
2842 | if (err) | |
1fb9341a | 2843 | goto ddebug_cleanup; |
be593f4c | 2844 | |
4c973d16 JY |
2845 | err = prepare_coming_module(mod); |
2846 | if (err) | |
2847 | goto bug_cleanup; | |
2848 | ||
ae39e9ed SK |
2849 | mod->async_probe_requested = async_probe; |
2850 | ||
51f3d0f4 | 2851 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 2852 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 2853 | -32768, 32767, mod, |
ecc86170 | 2854 | unknown_module_param_cb); |
51e158c1 RR |
2855 | if (IS_ERR(after_dashes)) { |
2856 | err = PTR_ERR(after_dashes); | |
4c973d16 | 2857 | goto coming_cleanup; |
51e158c1 RR |
2858 | } else if (after_dashes) { |
2859 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
2860 | mod->name, after_dashes); | |
2861 | } | |
1da177e4 | 2862 | |
ca86cad7 | 2863 | /* Link in to sysfs. */ |
34e1169d | 2864 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 2865 | if (err < 0) |
4c973d16 | 2866 | goto coming_cleanup; |
80a3d1bb | 2867 | |
1ce15ef4 JY |
2868 | if (is_livepatch_module(mod)) { |
2869 | err = copy_module_elf(mod, info); | |
2870 | if (err < 0) | |
2871 | goto sysfs_cleanup; | |
2872 | } | |
2873 | ||
48fd1188 | 2874 | /* Get rid of temporary copy. */ |
b1ae6dc4 | 2875 | free_copy(info, flags); |
1da177e4 LT |
2876 | |
2877 | /* Done! */ | |
51f3d0f4 | 2878 | trace_module_load(mod); |
34e1169d KC |
2879 | |
2880 | return do_init_module(mod); | |
1da177e4 | 2881 | |
1ce15ef4 JY |
2882 | sysfs_cleanup: |
2883 | mod_sysfs_teardown(mod); | |
4c973d16 | 2884 | coming_cleanup: |
885a78d4 | 2885 | mod->state = MODULE_STATE_GOING; |
a5544880 | 2886 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
2887 | blocking_notifier_call_chain(&module_notify_list, |
2888 | MODULE_STATE_GOING, mod); | |
7e545d6e | 2889 | klp_module_going(mod); |
1fb9341a | 2890 | bug_cleanup: |
5e8ed280 | 2891 | mod->state = MODULE_STATE_GOING; |
1fb9341a | 2892 | /* module_bug_cleanup needs module_mutex protection */ |
75676500 | 2893 | mutex_lock(&module_mutex); |
5336377d | 2894 | module_bug_cleanup(mod); |
ee61abb3 | 2895 | mutex_unlock(&module_mutex); |
ff7e0055 | 2896 | |
a3535c7e | 2897 | ddebug_cleanup: |
1323eac7 | 2898 | ftrace_release_mod(mod); |
b7b4eebd | 2899 | dynamic_debug_remove(mod, &info->dyndbg); |
cb2f5536 | 2900 | synchronize_rcu(); |
6526c534 RR |
2901 | kfree(mod->args); |
2902 | free_arch_cleanup: | |
1da177e4 | 2903 | module_arch_cleanup(mod); |
d913188c | 2904 | free_modinfo: |
a263f776 | 2905 | free_modinfo(mod); |
22e268eb | 2906 | free_unload: |
1da177e4 | 2907 | module_unload_free(mod); |
1fb9341a RR |
2908 | unlink_mod: |
2909 | mutex_lock(&module_mutex); | |
2910 | /* Unlink carefully: kallsyms could be walking list. */ | |
2911 | list_del_rcu(&mod->list); | |
758556bd | 2912 | mod_tree_remove(mod); |
1fb9341a | 2913 | wake_up_all(&module_wq); |
0be964be | 2914 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
cb2f5536 | 2915 | synchronize_rcu(); |
1fb9341a | 2916 | mutex_unlock(&module_mutex); |
d913188c | 2917 | free_module: |
35a9393c | 2918 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
6ab9942c | 2919 | lockdep_free_key_range(mod->data_layout.base, mod->data_layout.size); |
35a9393c | 2920 | |
34e1169d | 2921 | module_deallocate(mod, info); |
d913188c | 2922 | free_copy: |
b1ae6dc4 | 2923 | free_copy(info, flags); |
34e1169d | 2924 | return err; |
b99b87f7 PO |
2925 | } |
2926 | ||
17da2bd9 HC |
2927 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2928 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 2929 | { |
34e1169d KC |
2930 | int err; |
2931 | struct load_info info = { }; | |
1da177e4 | 2932 | |
34e1169d KC |
2933 | err = may_init_module(); |
2934 | if (err) | |
2935 | return err; | |
1da177e4 | 2936 | |
34e1169d KC |
2937 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
2938 | umod, len, uargs); | |
1da177e4 | 2939 | |
34e1169d KC |
2940 | err = copy_module_from_user(umod, len, &info); |
2941 | if (err) | |
2942 | return err; | |
1da177e4 | 2943 | |
2f3238ae | 2944 | return load_module(&info, uargs, 0); |
34e1169d | 2945 | } |
94462ad3 | 2946 | |
2f3238ae | 2947 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 2948 | { |
34e1169d | 2949 | struct load_info info = { }; |
b1ae6dc4 DT |
2950 | void *buf = NULL; |
2951 | int len; | |
a1db7420 | 2952 | int err; |
94462ad3 | 2953 | |
34e1169d KC |
2954 | err = may_init_module(); |
2955 | if (err) | |
2956 | return err; | |
1da177e4 | 2957 | |
2f3238ae | 2958 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 2959 | |
2f3238ae | 2960 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
b1ae6dc4 DT |
2961 | |MODULE_INIT_IGNORE_VERMAGIC |
2962 | |MODULE_INIT_COMPRESSED_FILE)) | |
2f3238ae | 2963 | return -EINVAL; |
d6de2c80 | 2964 | |
b1ae6dc4 | 2965 | len = kernel_read_file_from_fd(fd, 0, &buf, INT_MAX, NULL, |
a1db7420 | 2966 | READING_MODULE); |
b1ae6dc4 DT |
2967 | if (len < 0) |
2968 | return len; | |
2969 | ||
2970 | if (flags & MODULE_INIT_COMPRESSED_FILE) { | |
2971 | err = module_decompress(&info, buf, len); | |
2972 | vfree(buf); /* compressed data is no longer needed */ | |
2973 | if (err) | |
2974 | return err; | |
2975 | } else { | |
2976 | info.hdr = buf; | |
2977 | info.len = len; | |
2978 | } | |
1da177e4 | 2979 | |
2f3238ae | 2980 | return load_module(&info, uargs, flags); |
1da177e4 LT |
2981 | } |
2982 | ||
2983 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2984 | { | |
2985 | return ((void *)addr >= start && (void *)addr < start + size); | |
2986 | } | |
2987 | ||
7fd8329b | 2988 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ |
17dd25c2 | 2989 | char *module_flags(struct module *mod, char *buf, bool show_state) |
fa3ba2e8 FM |
2990 | { |
2991 | int bx = 0; | |
2992 | ||
0d21b0e3 | 2993 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
17dd25c2 AT |
2994 | if (!mod->taints && !show_state) |
2995 | goto out; | |
21aa9280 AV |
2996 | if (mod->taints || |
2997 | mod->state == MODULE_STATE_GOING || | |
2998 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 2999 | buf[bx++] = '('; |
c14e522b | 3000 | bx += module_flags_taint(mod->taints, buf + bx); |
21aa9280 | 3001 | /* Show a - for module-is-being-unloaded */ |
17dd25c2 | 3002 | if (mod->state == MODULE_STATE_GOING && show_state) |
21aa9280 AV |
3003 | buf[bx++] = '-'; |
3004 | /* Show a + for module-is-being-loaded */ | |
17dd25c2 | 3005 | if (mod->state == MODULE_STATE_COMING && show_state) |
21aa9280 | 3006 | buf[bx++] = '+'; |
fa3ba2e8 FM |
3007 | buf[bx++] = ')'; |
3008 | } | |
17dd25c2 | 3009 | out: |
fa3ba2e8 FM |
3010 | buf[bx] = '\0'; |
3011 | ||
3012 | return buf; | |
3013 | } | |
3014 | ||
1da177e4 LT |
3015 | /* Given an address, look for it in the module exception tables. */ |
3016 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3017 | { | |
1da177e4 LT |
3018 | const struct exception_table_entry *e = NULL; |
3019 | struct module *mod; | |
3020 | ||
24da1cbf | 3021 | preempt_disable(); |
5ff22646 PZ |
3022 | mod = __module_address(addr); |
3023 | if (!mod) | |
3024 | goto out; | |
22a8bdeb | 3025 | |
5ff22646 PZ |
3026 | if (!mod->num_exentries) |
3027 | goto out; | |
3028 | ||
3029 | e = search_extable(mod->extable, | |
a94c33dd | 3030 | mod->num_exentries, |
5ff22646 PZ |
3031 | addr); |
3032 | out: | |
24da1cbf | 3033 | preempt_enable(); |
1da177e4 | 3034 | |
5ff22646 PZ |
3035 | /* |
3036 | * Now, if we found one, we are running inside it now, hence | |
3037 | * we cannot unload the module, hence no refcnt needed. | |
3038 | */ | |
1da177e4 LT |
3039 | return e; |
3040 | } | |
3041 | ||
2541743e SS |
3042 | /** |
3043 | * is_module_address() - is this address inside a module? | |
e610499e RR |
3044 | * @addr: the address to check. |
3045 | * | |
3046 | * See is_module_text_address() if you simply want to see if the address | |
3047 | * is code (not data). | |
4d435f9d | 3048 | */ |
e610499e | 3049 | bool is_module_address(unsigned long addr) |
4d435f9d | 3050 | { |
e610499e | 3051 | bool ret; |
4d435f9d | 3052 | |
24da1cbf | 3053 | preempt_disable(); |
e610499e | 3054 | ret = __module_address(addr) != NULL; |
24da1cbf | 3055 | preempt_enable(); |
4d435f9d | 3056 | |
e610499e | 3057 | return ret; |
4d435f9d IM |
3058 | } |
3059 | ||
2541743e SS |
3060 | /** |
3061 | * __module_address() - get the module which contains an address. | |
e610499e RR |
3062 | * @addr: the address. |
3063 | * | |
3064 | * Must be called with preempt disabled or module mutex held so that | |
3065 | * module doesn't get freed during this. | |
3066 | */ | |
714f83d5 | 3067 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3068 | { |
3069 | struct module *mod; | |
01dc0386 | 3070 | struct mod_tree_root *tree; |
1da177e4 | 3071 | |
01dc0386 CL |
3072 | if (addr >= mod_tree.addr_min && addr <= mod_tree.addr_max) |
3073 | tree = &mod_tree; | |
3074 | #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC | |
3075 | else if (addr >= mod_data_tree.addr_min && addr <= mod_data_tree.addr_max) | |
3076 | tree = &mod_data_tree; | |
3077 | #endif | |
3078 | else | |
3a642e99 RR |
3079 | return NULL; |
3080 | ||
0be964be PZ |
3081 | module_assert_mutex_or_preempt(); |
3082 | ||
01dc0386 | 3083 | mod = mod_find(addr, tree); |
93c2e105 PZ |
3084 | if (mod) { |
3085 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 3086 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 3087 | mod = NULL; |
0d21b0e3 | 3088 | } |
93c2e105 | 3089 | return mod; |
1da177e4 LT |
3090 | } |
3091 | ||
2541743e SS |
3092 | /** |
3093 | * is_module_text_address() - is this address inside module code? | |
e610499e RR |
3094 | * @addr: the address to check. |
3095 | * | |
3096 | * See is_module_address() if you simply want to see if the address is | |
3097 | * anywhere in a module. See kernel_text_address() for testing if an | |
3098 | * address corresponds to kernel or module code. | |
3099 | */ | |
3100 | bool is_module_text_address(unsigned long addr) | |
3101 | { | |
3102 | bool ret; | |
3103 | ||
3104 | preempt_disable(); | |
3105 | ret = __module_text_address(addr) != NULL; | |
3106 | preempt_enable(); | |
3107 | ||
3108 | return ret; | |
3109 | } | |
3110 | ||
2541743e SS |
3111 | /** |
3112 | * __module_text_address() - get the module whose code contains an address. | |
e610499e RR |
3113 | * @addr: the address. |
3114 | * | |
3115 | * Must be called with preempt disabled or module mutex held so that | |
3116 | * module doesn't get freed during this. | |
3117 | */ | |
3118 | struct module *__module_text_address(unsigned long addr) | |
3119 | { | |
3120 | struct module *mod = __module_address(addr); | |
3121 | if (mod) { | |
3122 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
3123 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
3124 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
3125 | mod = NULL; |
3126 | } | |
3127 | return mod; | |
3128 | } | |
3129 | ||
1da177e4 LT |
3130 | /* Don't grab lock, we're oopsing. */ |
3131 | void print_modules(void) | |
3132 | { | |
3133 | struct module *mod; | |
7fd8329b | 3134 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 3135 | |
b231125a | 3136 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3137 | /* Most callers should already have preempt disabled, but make sure */ |
3138 | preempt_disable(); | |
0d21b0e3 RR |
3139 | list_for_each_entry_rcu(mod, &modules, list) { |
3140 | if (mod->state == MODULE_STATE_UNFORMED) | |
3141 | continue; | |
17dd25c2 | 3142 | pr_cont(" %s%s", mod->name, module_flags(mod, buf, true)); |
0d21b0e3 | 3143 | } |
99bd9956 AT |
3144 | |
3145 | print_unloaded_tainted_modules(); | |
d72b3751 | 3146 | preempt_enable(); |
6f1dae1d AT |
3147 | if (last_unloaded_module.name[0]) |
3148 | pr_cont(" [last unloaded: %s%s]", last_unloaded_module.name, | |
3149 | last_unloaded_module.taints); | |
27bba4d6 | 3150 | pr_cont("\n"); |
1da177e4 | 3151 | } |