Commit | Line | Data |
---|---|---|
f71d20e9 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 LT |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
9984de1a | 19 | #include <linux/export.h> |
8a293be0 | 20 | #include <linux/extable.h> |
1da177e4 | 21 | #include <linux/moduleloader.h> |
af658dca | 22 | #include <linux/trace_events.h> |
1da177e4 | 23 | #include <linux/init.h> |
ae84e324 | 24 | #include <linux/kallsyms.h> |
34e1169d | 25 | #include <linux/file.h> |
3b5d5c6b | 26 | #include <linux/fs.h> |
6d760133 | 27 | #include <linux/sysfs.h> |
9f158333 | 28 | #include <linux/kernel.h> |
1da177e4 LT |
29 | #include <linux/slab.h> |
30 | #include <linux/vmalloc.h> | |
31 | #include <linux/elf.h> | |
3b5d5c6b | 32 | #include <linux/proc_fs.h> |
2e72d51b | 33 | #include <linux/security.h> |
1da177e4 LT |
34 | #include <linux/seq_file.h> |
35 | #include <linux/syscalls.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/rcupdate.h> | |
c59ede7b | 38 | #include <linux/capability.h> |
1da177e4 LT |
39 | #include <linux/cpu.h> |
40 | #include <linux/moduleparam.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/err.h> | |
43 | #include <linux/vermagic.h> | |
44 | #include <linux/notifier.h> | |
f6a57033 | 45 | #include <linux/sched.h> |
1da177e4 | 46 | #include <linux/device.h> |
c988d2b2 | 47 | #include <linux/string.h> |
97d1f15b | 48 | #include <linux/mutex.h> |
d72b3751 | 49 | #include <linux/rculist.h> |
7c0f6ba6 | 50 | #include <linux/uaccess.h> |
1da177e4 | 51 | #include <asm/cacheflush.h> |
bbca07c3 LA |
52 | #ifdef CONFIG_STRICT_MODULE_RWX |
53 | #include <asm/set_memory.h> | |
54 | #endif | |
eb8cdec4 | 55 | #include <asm/mmu_context.h> |
b817f6fe | 56 | #include <linux/license.h> |
6d762394 | 57 | #include <asm/sections.h> |
97e1c18e | 58 | #include <linux/tracepoint.h> |
90d595fe | 59 | #include <linux/ftrace.h> |
7e545d6e | 60 | #include <linux/livepatch.h> |
22a9d645 | 61 | #include <linux/async.h> |
fbf59bc9 | 62 | #include <linux/percpu.h> |
4f2294b6 | 63 | #include <linux/kmemleak.h> |
bf5438fc | 64 | #include <linux/jump_label.h> |
84e1c6bb | 65 | #include <linux/pfn.h> |
403ed278 | 66 | #include <linux/bsearch.h> |
9d5059c9 | 67 | #include <linux/dynamic_debug.h> |
ca86cad7 | 68 | #include <linux/audit.h> |
2f3238ae | 69 | #include <uapi/linux/module.h> |
106a4ee2 | 70 | #include "module-internal.h" |
1da177e4 | 71 | |
7ead8b83 LZ |
72 | #define CREATE_TRACE_POINTS |
73 | #include <trace/events/module.h> | |
74 | ||
1da177e4 LT |
75 | #ifndef ARCH_SHF_SMALL |
76 | #define ARCH_SHF_SMALL 0 | |
77 | #endif | |
78 | ||
84e1c6bb | 79 | /* |
80 | * Modules' sections will be aligned on page boundaries | |
81 | * to ensure complete separation of code and data, but | |
0f5bf6d0 | 82 | * only when CONFIG_STRICT_MODULE_RWX=y |
84e1c6bb | 83 | */ |
0f5bf6d0 | 84 | #ifdef CONFIG_STRICT_MODULE_RWX |
84e1c6bb | 85 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
86 | #else | |
87 | # define debug_align(X) (X) | |
88 | #endif | |
89 | ||
1da177e4 LT |
90 | /* If this is set, the section belongs in the init part of the module */ |
91 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
92 | ||
75676500 RR |
93 | /* |
94 | * Mutex protects: | |
95 | * 1) List of modules (also safely readable with preempt_disable), | |
96 | * 2) module_use links, | |
97 | * 3) module_addr_min/module_addr_max. | |
e513cc1c | 98 | * (delete and add uses RCU list operations). */ |
c6b37801 TA |
99 | DEFINE_MUTEX(module_mutex); |
100 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 101 | static LIST_HEAD(modules); |
67fc4e0c | 102 | |
6c9692e2 | 103 | #ifdef CONFIG_MODULES_TREE_LOOKUP |
106a4ee2 | 104 | |
93c2e105 PZ |
105 | /* |
106 | * Use a latched RB-tree for __module_address(); this allows us to use | |
107 | * RCU-sched lookups of the address from any context. | |
108 | * | |
6c9692e2 PZ |
109 | * This is conditional on PERF_EVENTS || TRACING because those can really hit |
110 | * __module_address() hard by doing a lot of stack unwinding; potentially from | |
111 | * NMI context. | |
93c2e105 PZ |
112 | */ |
113 | ||
114 | static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) | |
106a4ee2 | 115 | { |
7523e4dc | 116 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
106a4ee2 | 117 | |
7523e4dc | 118 | return (unsigned long)layout->base; |
93c2e105 PZ |
119 | } |
120 | ||
121 | static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) | |
122 | { | |
7523e4dc | 123 | struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
93c2e105 | 124 | |
7523e4dc | 125 | return (unsigned long)layout->size; |
93c2e105 PZ |
126 | } |
127 | ||
128 | static __always_inline bool | |
129 | mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) | |
130 | { | |
131 | return __mod_tree_val(a) < __mod_tree_val(b); | |
132 | } | |
133 | ||
134 | static __always_inline int | |
135 | mod_tree_comp(void *key, struct latch_tree_node *n) | |
136 | { | |
137 | unsigned long val = (unsigned long)key; | |
138 | unsigned long start, end; | |
139 | ||
140 | start = __mod_tree_val(n); | |
141 | if (val < start) | |
142 | return -1; | |
143 | ||
144 | end = start + __mod_tree_size(n); | |
145 | if (val >= end) | |
146 | return 1; | |
106a4ee2 | 147 | |
106a4ee2 RR |
148 | return 0; |
149 | } | |
150 | ||
93c2e105 PZ |
151 | static const struct latch_tree_ops mod_tree_ops = { |
152 | .less = mod_tree_less, | |
153 | .comp = mod_tree_comp, | |
154 | }; | |
155 | ||
4f666546 PZ |
156 | static struct mod_tree_root { |
157 | struct latch_tree_root root; | |
158 | unsigned long addr_min; | |
159 | unsigned long addr_max; | |
160 | } mod_tree __cacheline_aligned = { | |
161 | .addr_min = -1UL, | |
106a4ee2 | 162 | }; |
106a4ee2 | 163 | |
4f666546 PZ |
164 | #define module_addr_min mod_tree.addr_min |
165 | #define module_addr_max mod_tree.addr_max | |
166 | ||
167 | static noinline void __mod_tree_insert(struct mod_tree_node *node) | |
168 | { | |
169 | latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); | |
170 | } | |
171 | ||
172 | static void __mod_tree_remove(struct mod_tree_node *node) | |
173 | { | |
174 | latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); | |
175 | } | |
93c2e105 PZ |
176 | |
177 | /* | |
178 | * These modifications: insert, remove_init and remove; are serialized by the | |
179 | * module_mutex. | |
180 | */ | |
181 | static void mod_tree_insert(struct module *mod) | |
182 | { | |
7523e4dc RR |
183 | mod->core_layout.mtn.mod = mod; |
184 | mod->init_layout.mtn.mod = mod; | |
93c2e105 | 185 | |
7523e4dc RR |
186 | __mod_tree_insert(&mod->core_layout.mtn); |
187 | if (mod->init_layout.size) | |
188 | __mod_tree_insert(&mod->init_layout.mtn); | |
93c2e105 PZ |
189 | } |
190 | ||
191 | static void mod_tree_remove_init(struct module *mod) | |
192 | { | |
7523e4dc RR |
193 | if (mod->init_layout.size) |
194 | __mod_tree_remove(&mod->init_layout.mtn); | |
93c2e105 PZ |
195 | } |
196 | ||
197 | static void mod_tree_remove(struct module *mod) | |
198 | { | |
7523e4dc | 199 | __mod_tree_remove(&mod->core_layout.mtn); |
93c2e105 PZ |
200 | mod_tree_remove_init(mod); |
201 | } | |
202 | ||
6c9692e2 | 203 | static struct module *mod_find(unsigned long addr) |
93c2e105 PZ |
204 | { |
205 | struct latch_tree_node *ltn; | |
206 | ||
4f666546 | 207 | ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
93c2e105 PZ |
208 | if (!ltn) |
209 | return NULL; | |
210 | ||
211 | return container_of(ltn, struct mod_tree_node, node)->mod; | |
212 | } | |
213 | ||
6c9692e2 PZ |
214 | #else /* MODULES_TREE_LOOKUP */ |
215 | ||
4f666546 PZ |
216 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
217 | ||
6c9692e2 PZ |
218 | static void mod_tree_insert(struct module *mod) { } |
219 | static void mod_tree_remove_init(struct module *mod) { } | |
220 | static void mod_tree_remove(struct module *mod) { } | |
221 | ||
222 | static struct module *mod_find(unsigned long addr) | |
223 | { | |
224 | struct module *mod; | |
225 | ||
226 | list_for_each_entry_rcu(mod, &modules, list) { | |
227 | if (within_module(addr, mod)) | |
228 | return mod; | |
229 | } | |
230 | ||
231 | return NULL; | |
232 | } | |
233 | ||
234 | #endif /* MODULES_TREE_LOOKUP */ | |
235 | ||
4f666546 PZ |
236 | /* |
237 | * Bounds of module text, for speeding up __module_address. | |
238 | * Protected by module_mutex. | |
239 | */ | |
240 | static void __mod_update_bounds(void *base, unsigned int size) | |
241 | { | |
242 | unsigned long min = (unsigned long)base; | |
243 | unsigned long max = min + size; | |
244 | ||
245 | if (min < module_addr_min) | |
246 | module_addr_min = min; | |
247 | if (max > module_addr_max) | |
248 | module_addr_max = max; | |
249 | } | |
250 | ||
251 | static void mod_update_bounds(struct module *mod) | |
252 | { | |
7523e4dc RR |
253 | __mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
254 | if (mod->init_layout.size) | |
255 | __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); | |
4f666546 PZ |
256 | } |
257 | ||
67fc4e0c JW |
258 | #ifdef CONFIG_KGDB_KDB |
259 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
260 | #endif /* CONFIG_KGDB_KDB */ | |
261 | ||
0be964be PZ |
262 | static void module_assert_mutex(void) |
263 | { | |
264 | lockdep_assert_held(&module_mutex); | |
265 | } | |
266 | ||
267 | static void module_assert_mutex_or_preempt(void) | |
268 | { | |
269 | #ifdef CONFIG_LOCKDEP | |
270 | if (unlikely(!debug_locks)) | |
271 | return; | |
272 | ||
9502514f | 273 | WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
0be964be PZ |
274 | !lockdep_is_held(&module_mutex)); |
275 | #endif | |
276 | } | |
277 | ||
6727bb9c LR |
278 | static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
279 | #ifndef CONFIG_MODULE_SIG_FORCE | |
106a4ee2 RR |
280 | module_param(sig_enforce, bool_enable_only, 0644); |
281 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
1da177e4 | 282 | |
19e4529e SR |
283 | /* Block module loading/unloading? */ |
284 | int modules_disabled = 0; | |
02608bef | 285 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 286 | |
c9a3ba55 RR |
287 | /* Waiting for a module to finish initializing? */ |
288 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
289 | ||
e041c683 | 290 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 291 | |
6da0b565 | 292 | int register_module_notifier(struct notifier_block *nb) |
1da177e4 | 293 | { |
e041c683 | 294 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
295 | } |
296 | EXPORT_SYMBOL(register_module_notifier); | |
297 | ||
6da0b565 | 298 | int unregister_module_notifier(struct notifier_block *nb) |
1da177e4 | 299 | { |
e041c683 | 300 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
301 | } |
302 | EXPORT_SYMBOL(unregister_module_notifier); | |
303 | ||
eded41c1 | 304 | struct load_info { |
3e2e857f | 305 | char *name; |
eded41c1 RR |
306 | Elf_Ehdr *hdr; |
307 | unsigned long len; | |
308 | Elf_Shdr *sechdrs; | |
6526c534 | 309 | char *secstrings, *strtab; |
d913188c | 310 | unsigned long symoffs, stroffs; |
811d66a0 RR |
311 | struct _ddebug *debug; |
312 | unsigned int num_debug; | |
106a4ee2 | 313 | bool sig_ok; |
8244062e RR |
314 | #ifdef CONFIG_KALLSYMS |
315 | unsigned long mod_kallsyms_init_off; | |
316 | #endif | |
eded41c1 RR |
317 | struct { |
318 | unsigned int sym, str, mod, vers, info, pcpu; | |
319 | } index; | |
320 | }; | |
321 | ||
71d9f507 MB |
322 | /* |
323 | * We require a truly strong try_module_get(): 0 means success. | |
324 | * Otherwise an error is returned due to ongoing or failed | |
325 | * initialization etc. | |
326 | */ | |
1da177e4 LT |
327 | static inline int strong_try_module_get(struct module *mod) |
328 | { | |
0d21b0e3 | 329 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 330 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
331 | return -EBUSY; |
332 | if (try_module_get(mod)) | |
1da177e4 | 333 | return 0; |
c9a3ba55 RR |
334 | else |
335 | return -ENOENT; | |
1da177e4 LT |
336 | } |
337 | ||
373d4d09 RR |
338 | static inline void add_taint_module(struct module *mod, unsigned flag, |
339 | enum lockdep_ok lockdep_ok) | |
fa3ba2e8 | 340 | { |
373d4d09 | 341 | add_taint(flag, lockdep_ok); |
7fd8329b | 342 | set_bit(flag, &mod->taints); |
fa3ba2e8 FM |
343 | } |
344 | ||
02a3e59a RD |
345 | /* |
346 | * A thread that wants to hold a reference to a module only while it | |
347 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 | 348 | */ |
bf262dce | 349 | void __noreturn __module_put_and_exit(struct module *mod, long code) |
1da177e4 LT |
350 | { |
351 | module_put(mod); | |
352 | do_exit(code); | |
353 | } | |
354 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 355 | |
1da177e4 | 356 | /* Find a module section: 0 means not found. */ |
49668688 | 357 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
358 | { |
359 | unsigned int i; | |
360 | ||
49668688 RR |
361 | for (i = 1; i < info->hdr->e_shnum; i++) { |
362 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 363 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
364 | if ((shdr->sh_flags & SHF_ALLOC) |
365 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 366 | return i; |
49668688 | 367 | } |
1da177e4 LT |
368 | return 0; |
369 | } | |
370 | ||
5e458cc0 | 371 | /* Find a module section, or NULL. */ |
49668688 | 372 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
373 | { |
374 | /* Section 0 has sh_addr 0. */ | |
49668688 | 375 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
376 | } |
377 | ||
378 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 379 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
380 | const char *name, |
381 | size_t object_size, | |
382 | unsigned int *num) | |
383 | { | |
49668688 | 384 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
385 | |
386 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
387 | *num = info->sechdrs[sec].sh_size / object_size; |
388 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
389 | } |
390 | ||
1da177e4 LT |
391 | /* Provided by the linker */ |
392 | extern const struct kernel_symbol __start___ksymtab[]; | |
393 | extern const struct kernel_symbol __stop___ksymtab[]; | |
394 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
395 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
396 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
397 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
71810db2 AB |
398 | extern const s32 __start___kcrctab[]; |
399 | extern const s32 __start___kcrctab_gpl[]; | |
400 | extern const s32 __start___kcrctab_gpl_future[]; | |
f7f5b675 DV |
401 | #ifdef CONFIG_UNUSED_SYMBOLS |
402 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
403 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
404 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
405 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
71810db2 AB |
406 | extern const s32 __start___kcrctab_unused[]; |
407 | extern const s32 __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 408 | #endif |
1da177e4 LT |
409 | |
410 | #ifndef CONFIG_MODVERSIONS | |
411 | #define symversion(base, idx) NULL | |
412 | #else | |
f83ca9fe | 413 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
414 | #endif |
415 | ||
dafd0940 RR |
416 | static bool each_symbol_in_section(const struct symsearch *arr, |
417 | unsigned int arrsize, | |
418 | struct module *owner, | |
419 | bool (*fn)(const struct symsearch *syms, | |
420 | struct module *owner, | |
de4d8d53 | 421 | void *data), |
dafd0940 | 422 | void *data) |
ad9546c9 | 423 | { |
de4d8d53 | 424 | unsigned int j; |
ad9546c9 | 425 | |
dafd0940 | 426 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
427 | if (fn(&arr[j], owner, data)) |
428 | return true; | |
f71d20e9 | 429 | } |
dafd0940 RR |
430 | |
431 | return false; | |
ad9546c9 RR |
432 | } |
433 | ||
dafd0940 | 434 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
435 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
436 | struct module *owner, | |
437 | void *data), | |
438 | void *data) | |
ad9546c9 RR |
439 | { |
440 | struct module *mod; | |
44032e63 | 441 | static const struct symsearch arr[] = { |
ad9546c9 | 442 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 443 | NOT_GPL_ONLY, false }, |
ad9546c9 | 444 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
445 | __start___kcrctab_gpl, |
446 | GPL_ONLY, false }, | |
ad9546c9 | 447 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
448 | __start___kcrctab_gpl_future, |
449 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 450 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 451 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
452 | __start___kcrctab_unused, |
453 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 454 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
455 | __start___kcrctab_unused_gpl, |
456 | GPL_ONLY, true }, | |
f7f5b675 | 457 | #endif |
ad9546c9 | 458 | }; |
f71d20e9 | 459 | |
0be964be PZ |
460 | module_assert_mutex_or_preempt(); |
461 | ||
dafd0940 RR |
462 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
463 | return true; | |
f71d20e9 | 464 | |
d72b3751 | 465 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
466 | struct symsearch arr[] = { |
467 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 468 | NOT_GPL_ONLY, false }, |
ad9546c9 | 469 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
470 | mod->gpl_crcs, |
471 | GPL_ONLY, false }, | |
ad9546c9 RR |
472 | { mod->gpl_future_syms, |
473 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
474 | mod->gpl_future_crcs, |
475 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 476 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
477 | { mod->unused_syms, |
478 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
479 | mod->unused_crcs, |
480 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
481 | { mod->unused_gpl_syms, |
482 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
483 | mod->unused_gpl_crcs, |
484 | GPL_ONLY, true }, | |
f7f5b675 | 485 | #endif |
ad9546c9 RR |
486 | }; |
487 | ||
0d21b0e3 RR |
488 | if (mod->state == MODULE_STATE_UNFORMED) |
489 | continue; | |
490 | ||
dafd0940 RR |
491 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
492 | return true; | |
493 | } | |
494 | return false; | |
495 | } | |
de4d8d53 | 496 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
497 | |
498 | struct find_symbol_arg { | |
499 | /* Input */ | |
500 | const char *name; | |
501 | bool gplok; | |
502 | bool warn; | |
503 | ||
504 | /* Output */ | |
505 | struct module *owner; | |
71810db2 | 506 | const s32 *crc; |
414fd31b | 507 | const struct kernel_symbol *sym; |
dafd0940 RR |
508 | }; |
509 | ||
de4d8d53 RR |
510 | static bool check_symbol(const struct symsearch *syms, |
511 | struct module *owner, | |
512 | unsigned int symnum, void *data) | |
dafd0940 RR |
513 | { |
514 | struct find_symbol_arg *fsa = data; | |
515 | ||
dafd0940 RR |
516 | if (!fsa->gplok) { |
517 | if (syms->licence == GPL_ONLY) | |
518 | return false; | |
519 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
bddb12b3 AM |
520 | pr_warn("Symbol %s is being used by a non-GPL module, " |
521 | "which will not be allowed in the future\n", | |
522 | fsa->name); | |
9f28bb7e | 523 | } |
1da177e4 | 524 | } |
ad9546c9 | 525 | |
f7f5b675 | 526 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 | 527 | if (syms->unused && fsa->warn) { |
bddb12b3 AM |
528 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
529 | "using it.\n", fsa->name); | |
530 | pr_warn("This symbol will go away in the future.\n"); | |
7b63c3ab YG |
531 | pr_warn("Please evaluate if this is the right api to use and " |
532 | "if it really is, submit a report to the linux kernel " | |
533 | "mailing list together with submitting your code for " | |
bddb12b3 | 534 | "inclusion.\n"); |
dafd0940 | 535 | } |
f7f5b675 | 536 | #endif |
dafd0940 RR |
537 | |
538 | fsa->owner = owner; | |
539 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 540 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
541 | return true; |
542 | } | |
543 | ||
403ed278 AIB |
544 | static int cmp_name(const void *va, const void *vb) |
545 | { | |
546 | const char *a; | |
547 | const struct kernel_symbol *b; | |
548 | a = va; b = vb; | |
549 | return strcmp(a, b->name); | |
550 | } | |
551 | ||
de4d8d53 RR |
552 | static bool find_symbol_in_section(const struct symsearch *syms, |
553 | struct module *owner, | |
554 | void *data) | |
555 | { | |
556 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
557 | struct kernel_symbol *sym; |
558 | ||
559 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
560 | sizeof(struct kernel_symbol), cmp_name); | |
561 | ||
562 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
563 | return true; | |
de4d8d53 | 564 | |
de4d8d53 RR |
565 | return false; |
566 | } | |
567 | ||
414fd31b | 568 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 569 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
570 | const struct kernel_symbol *find_symbol(const char *name, |
571 | struct module **owner, | |
71810db2 | 572 | const s32 **crc, |
c6b37801 TA |
573 | bool gplok, |
574 | bool warn) | |
dafd0940 RR |
575 | { |
576 | struct find_symbol_arg fsa; | |
577 | ||
578 | fsa.name = name; | |
579 | fsa.gplok = gplok; | |
580 | fsa.warn = warn; | |
581 | ||
de4d8d53 | 582 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
583 | if (owner) |
584 | *owner = fsa.owner; | |
585 | if (crc) | |
586 | *crc = fsa.crc; | |
414fd31b | 587 | return fsa.sym; |
dafd0940 RR |
588 | } |
589 | ||
5e124169 | 590 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 591 | return NULL; |
1da177e4 | 592 | } |
c6b37801 | 593 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 594 | |
fe0d34d2 RR |
595 | /* |
596 | * Search for module by name: must hold module_mutex (or preempt disabled | |
597 | * for read-only access). | |
598 | */ | |
4f6de4d5 | 599 | static struct module *find_module_all(const char *name, size_t len, |
0d21b0e3 | 600 | bool even_unformed) |
1da177e4 LT |
601 | { |
602 | struct module *mod; | |
603 | ||
fe0d34d2 | 604 | module_assert_mutex_or_preempt(); |
0be964be | 605 | |
93437353 | 606 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
607 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
608 | continue; | |
4f6de4d5 | 609 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4 LT |
610 | return mod; |
611 | } | |
612 | return NULL; | |
613 | } | |
0d21b0e3 RR |
614 | |
615 | struct module *find_module(const char *name) | |
616 | { | |
fe0d34d2 | 617 | module_assert_mutex(); |
4f6de4d5 | 618 | return find_module_all(name, strlen(name), false); |
0d21b0e3 | 619 | } |
c6b37801 | 620 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
621 | |
622 | #ifdef CONFIG_SMP | |
fbf59bc9 | 623 | |
259354de | 624 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 625 | { |
259354de TH |
626 | return mod->percpu; |
627 | } | |
fbf59bc9 | 628 | |
9eb76d77 | 629 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 630 | { |
9eb76d77 RR |
631 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
632 | unsigned long align = pcpusec->sh_addralign; | |
633 | ||
634 | if (!pcpusec->sh_size) | |
635 | return 0; | |
636 | ||
fbf59bc9 | 637 | if (align > PAGE_SIZE) { |
bddb12b3 AM |
638 | pr_warn("%s: per-cpu alignment %li > %li\n", |
639 | mod->name, align, PAGE_SIZE); | |
fbf59bc9 TH |
640 | align = PAGE_SIZE; |
641 | } | |
642 | ||
9eb76d77 | 643 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354de | 644 | if (!mod->percpu) { |
bddb12b3 AM |
645 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
646 | mod->name, (unsigned long)pcpusec->sh_size); | |
259354de TH |
647 | return -ENOMEM; |
648 | } | |
9eb76d77 | 649 | mod->percpu_size = pcpusec->sh_size; |
259354de | 650 | return 0; |
fbf59bc9 TH |
651 | } |
652 | ||
259354de | 653 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 654 | { |
259354de | 655 | free_percpu(mod->percpu); |
fbf59bc9 TH |
656 | } |
657 | ||
49668688 | 658 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 659 | { |
49668688 | 660 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
661 | } |
662 | ||
259354de TH |
663 | static void percpu_modcopy(struct module *mod, |
664 | const void *from, unsigned long size) | |
6b588c18 TH |
665 | { |
666 | int cpu; | |
667 | ||
668 | for_each_possible_cpu(cpu) | |
259354de | 669 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
670 | } |
671 | ||
383776fa | 672 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
10fad5e4 TH |
673 | { |
674 | struct module *mod; | |
675 | unsigned int cpu; | |
676 | ||
677 | preempt_disable(); | |
678 | ||
679 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
680 | if (mod->state == MODULE_STATE_UNFORMED) |
681 | continue; | |
10fad5e4 TH |
682 | if (!mod->percpu_size) |
683 | continue; | |
684 | for_each_possible_cpu(cpu) { | |
685 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
383776fa | 686 | void *va = (void *)addr; |
10fad5e4 | 687 | |
383776fa | 688 | if (va >= start && va < start + mod->percpu_size) { |
8ce371f9 | 689 | if (can_addr) { |
383776fa | 690 | *can_addr = (unsigned long) (va - start); |
8ce371f9 PZ |
691 | *can_addr += (unsigned long) |
692 | per_cpu_ptr(mod->percpu, | |
693 | get_boot_cpu_id()); | |
694 | } | |
10fad5e4 TH |
695 | preempt_enable(); |
696 | return true; | |
697 | } | |
698 | } | |
699 | } | |
700 | ||
701 | preempt_enable(); | |
702 | return false; | |
6b588c18 TH |
703 | } |
704 | ||
383776fa TG |
705 | /** |
706 | * is_module_percpu_address - test whether address is from module static percpu | |
707 | * @addr: address to test | |
708 | * | |
709 | * Test whether @addr belongs to module static percpu area. | |
710 | * | |
711 | * RETURNS: | |
712 | * %true if @addr is from module static percpu area | |
713 | */ | |
714 | bool is_module_percpu_address(unsigned long addr) | |
715 | { | |
716 | return __is_module_percpu_address(addr, NULL); | |
717 | } | |
718 | ||
1da177e4 | 719 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 720 | |
259354de | 721 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
722 | { |
723 | return NULL; | |
724 | } | |
9eb76d77 | 725 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354de | 726 | { |
9eb76d77 RR |
727 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
728 | if (info->sechdrs[info->index.pcpu].sh_size != 0) | |
729 | return -ENOMEM; | |
730 | return 0; | |
259354de TH |
731 | } |
732 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 733 | { |
1da177e4 | 734 | } |
49668688 | 735 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
736 | { |
737 | return 0; | |
738 | } | |
259354de TH |
739 | static inline void percpu_modcopy(struct module *mod, |
740 | const void *from, unsigned long size) | |
1da177e4 LT |
741 | { |
742 | /* pcpusec should be 0, and size of that section should be 0. */ | |
743 | BUG_ON(size != 0); | |
744 | } | |
10fad5e4 TH |
745 | bool is_module_percpu_address(unsigned long addr) |
746 | { | |
747 | return false; | |
748 | } | |
6b588c18 | 749 | |
383776fa TG |
750 | bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
751 | { | |
752 | return false; | |
753 | } | |
754 | ||
1da177e4 LT |
755 | #endif /* CONFIG_SMP */ |
756 | ||
c988d2b2 MD |
757 | #define MODINFO_ATTR(field) \ |
758 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
759 | { \ | |
760 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
761 | } \ | |
762 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 763 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 764 | { \ |
cc56ded3 | 765 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
766 | } \ |
767 | static int modinfo_##field##_exists(struct module *mod) \ | |
768 | { \ | |
769 | return mod->field != NULL; \ | |
770 | } \ | |
771 | static void free_modinfo_##field(struct module *mod) \ | |
772 | { \ | |
22a8bdeb DW |
773 | kfree(mod->field); \ |
774 | mod->field = NULL; \ | |
c988d2b2 MD |
775 | } \ |
776 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 777 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
778 | .show = show_modinfo_##field, \ |
779 | .setup = setup_modinfo_##field, \ | |
780 | .test = modinfo_##field##_exists, \ | |
781 | .free = free_modinfo_##field, \ | |
782 | }; | |
783 | ||
784 | MODINFO_ATTR(version); | |
785 | MODINFO_ATTR(srcversion); | |
786 | ||
e14af7ee AV |
787 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
788 | ||
03e88ae1 | 789 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
790 | |
791 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
792 | ||
e513cc1c MH |
793 | /* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
794 | #define MODULE_REF_BASE 1 | |
795 | ||
1da177e4 | 796 | /* Init the unload section of the module. */ |
9f85a4bb | 797 | static int module_unload_init(struct module *mod) |
1da177e4 | 798 | { |
e513cc1c MH |
799 | /* |
800 | * Initialize reference counter to MODULE_REF_BASE. | |
801 | * refcnt == 0 means module is going. | |
802 | */ | |
803 | atomic_set(&mod->refcnt, MODULE_REF_BASE); | |
9f85a4bb | 804 | |
2c02dfe7 LT |
805 | INIT_LIST_HEAD(&mod->source_list); |
806 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 807 | |
1da177e4 | 808 | /* Hold reference count during initialization. */ |
e513cc1c | 809 | atomic_inc(&mod->refcnt); |
9f85a4bb RR |
810 | |
811 | return 0; | |
1da177e4 LT |
812 | } |
813 | ||
1da177e4 LT |
814 | /* Does a already use b? */ |
815 | static int already_uses(struct module *a, struct module *b) | |
816 | { | |
817 | struct module_use *use; | |
818 | ||
2c02dfe7 LT |
819 | list_for_each_entry(use, &b->source_list, source_list) { |
820 | if (use->source == a) { | |
5e124169 | 821 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
822 | return 1; |
823 | } | |
824 | } | |
5e124169 | 825 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
826 | return 0; |
827 | } | |
828 | ||
2c02dfe7 LT |
829 | /* |
830 | * Module a uses b | |
831 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
832 | * - the module_use is added to the list of 'b' sources (so | |
833 | * 'b' can walk the list to see who sourced them), and of 'a' | |
834 | * targets (so 'a' can see what modules it targets). | |
835 | */ | |
836 | static int add_module_usage(struct module *a, struct module *b) | |
837 | { | |
2c02dfe7 LT |
838 | struct module_use *use; |
839 | ||
5e124169 | 840 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
841 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
842 | if (!use) { | |
bddb12b3 | 843 | pr_warn("%s: out of memory loading\n", a->name); |
2c02dfe7 LT |
844 | return -ENOMEM; |
845 | } | |
846 | ||
847 | use->source = a; | |
848 | use->target = b; | |
849 | list_add(&use->source_list, &b->source_list); | |
850 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
851 | return 0; |
852 | } | |
853 | ||
75676500 | 854 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 855 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 856 | { |
c8e21ced | 857 | int err; |
270a6c4c | 858 | |
9bea7f23 | 859 | if (b == NULL || already_uses(a, b)) |
218ce735 | 860 | return 0; |
218ce735 | 861 | |
9bea7f23 RR |
862 | /* If module isn't available, we fail. */ |
863 | err = strong_try_module_get(b); | |
c9a3ba55 | 864 | if (err) |
9bea7f23 | 865 | return err; |
1da177e4 | 866 | |
2c02dfe7 LT |
867 | err = add_module_usage(a, b); |
868 | if (err) { | |
1da177e4 | 869 | module_put(b); |
9bea7f23 | 870 | return err; |
1da177e4 | 871 | } |
9bea7f23 | 872 | return 0; |
1da177e4 | 873 | } |
9bea7f23 | 874 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
875 | |
876 | /* Clear the unload stuff of the module. */ | |
877 | static void module_unload_free(struct module *mod) | |
878 | { | |
2c02dfe7 | 879 | struct module_use *use, *tmp; |
1da177e4 | 880 | |
75676500 | 881 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
882 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
883 | struct module *i = use->target; | |
5e124169 | 884 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
885 | module_put(i); |
886 | list_del(&use->source_list); | |
887 | list_del(&use->target_list); | |
888 | kfree(use); | |
1da177e4 | 889 | } |
75676500 | 890 | mutex_unlock(&module_mutex); |
1da177e4 LT |
891 | } |
892 | ||
893 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 894 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
895 | { |
896 | int ret = (flags & O_TRUNC); | |
897 | if (ret) | |
373d4d09 | 898 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
899 | return ret; |
900 | } | |
901 | #else | |
fb169793 | 902 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
903 | { |
904 | return 0; | |
905 | } | |
906 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
907 | ||
e513cc1c MH |
908 | /* Try to release refcount of module, 0 means success. */ |
909 | static int try_release_module_ref(struct module *mod) | |
1da177e4 | 910 | { |
e513cc1c | 911 | int ret; |
1da177e4 | 912 | |
e513cc1c MH |
913 | /* Try to decrement refcnt which we set at loading */ |
914 | ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); | |
915 | BUG_ON(ret < 0); | |
916 | if (ret) | |
917 | /* Someone can put this right now, recover with checking */ | |
918 | ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); | |
1da177e4 | 919 | |
e513cc1c MH |
920 | return ret; |
921 | } | |
1da177e4 | 922 | |
e513cc1c MH |
923 | static int try_stop_module(struct module *mod, int flags, int *forced) |
924 | { | |
da39ba5e | 925 | /* If it's not unused, quit unless we're forcing. */ |
e513cc1c MH |
926 | if (try_release_module_ref(mod) != 0) { |
927 | *forced = try_force_unload(flags); | |
928 | if (!(*forced)) | |
1da177e4 LT |
929 | return -EWOULDBLOCK; |
930 | } | |
931 | ||
932 | /* Mark it as dying. */ | |
e513cc1c | 933 | mod->state = MODULE_STATE_GOING; |
1da177e4 | 934 | |
e513cc1c | 935 | return 0; |
1da177e4 LT |
936 | } |
937 | ||
d5db139a RR |
938 | /** |
939 | * module_refcount - return the refcount or -1 if unloading | |
940 | * | |
941 | * @mod: the module we're checking | |
942 | * | |
943 | * Returns: | |
944 | * -1 if the module is in the process of unloading | |
945 | * otherwise the number of references in the kernel to the module | |
946 | */ | |
947 | int module_refcount(struct module *mod) | |
1da177e4 | 948 | { |
d5db139a | 949 | return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4 LT |
950 | } |
951 | EXPORT_SYMBOL(module_refcount); | |
952 | ||
953 | /* This exists whether we can unload or not */ | |
954 | static void free_module(struct module *mod); | |
955 | ||
17da2bd9 HC |
956 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
957 | unsigned int, flags) | |
1da177e4 LT |
958 | { |
959 | struct module *mod; | |
dfff0a06 | 960 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
961 | int ret, forced = 0; |
962 | ||
3d43321b | 963 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
964 | return -EPERM; |
965 | ||
966 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
967 | return -EFAULT; | |
968 | name[MODULE_NAME_LEN-1] = '\0'; | |
969 | ||
f6276ac9 RGB |
970 | audit_log_kern_module(name); |
971 | ||
3fc1f1e2 TH |
972 | if (mutex_lock_interruptible(&module_mutex) != 0) |
973 | return -EINTR; | |
1da177e4 LT |
974 | |
975 | mod = find_module(name); | |
976 | if (!mod) { | |
977 | ret = -ENOENT; | |
978 | goto out; | |
979 | } | |
980 | ||
2c02dfe7 | 981 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
982 | /* Other modules depend on us: get rid of them first. */ |
983 | ret = -EWOULDBLOCK; | |
984 | goto out; | |
985 | } | |
986 | ||
987 | /* Doing init or already dying? */ | |
988 | if (mod->state != MODULE_STATE_LIVE) { | |
3f2b9c9c | 989 | /* FIXME: if (force), slam module count damn the torpedoes */ |
5e124169 | 990 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
991 | ret = -EBUSY; |
992 | goto out; | |
993 | } | |
994 | ||
995 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 996 | if (mod->init && !mod->exit) { |
fb169793 | 997 | forced = try_force_unload(flags); |
1da177e4 LT |
998 | if (!forced) { |
999 | /* This module can't be removed */ | |
1000 | ret = -EBUSY; | |
1001 | goto out; | |
1002 | } | |
1003 | } | |
1004 | ||
1da177e4 LT |
1005 | /* Stop the machine so refcounts can't move and disable module. */ |
1006 | ret = try_stop_module(mod, flags, &forced); | |
1007 | if (ret != 0) | |
1008 | goto out; | |
1009 | ||
df4b565e | 1010 | mutex_unlock(&module_mutex); |
25985edc | 1011 | /* Final destruction now no one is using it. */ |
df4b565e | 1012 | if (mod->exit != NULL) |
1da177e4 | 1013 | mod->exit(); |
df4b565e PO |
1014 | blocking_notifier_call_chain(&module_notify_list, |
1015 | MODULE_STATE_GOING, mod); | |
7e545d6e | 1016 | klp_module_going(mod); |
7dcd182b JY |
1017 | ftrace_release_mod(mod); |
1018 | ||
22a9d645 | 1019 | async_synchronize_full(); |
75676500 | 1020 | |
e14af7ee | 1021 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 1022 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 1023 | |
75676500 RR |
1024 | free_module(mod); |
1025 | return 0; | |
1026 | out: | |
6389a385 | 1027 | mutex_unlock(&module_mutex); |
1da177e4 LT |
1028 | return ret; |
1029 | } | |
1030 | ||
d1e99d7a | 1031 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1032 | { |
1033 | struct module_use *use; | |
1034 | int printed_something = 0; | |
1035 | ||
d5db139a | 1036 | seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4 | 1037 | |
6da0b565 IA |
1038 | /* |
1039 | * Always include a trailing , so userspace can differentiate | |
1040 | * between this and the old multi-field proc format. | |
1041 | */ | |
2c02dfe7 | 1042 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 1043 | printed_something = 1; |
2c02dfe7 | 1044 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
1045 | } |
1046 | ||
1da177e4 LT |
1047 | if (mod->init != NULL && mod->exit == NULL) { |
1048 | printed_something = 1; | |
6da0b565 | 1049 | seq_puts(m, "[permanent],"); |
1da177e4 LT |
1050 | } |
1051 | ||
1052 | if (!printed_something) | |
6da0b565 | 1053 | seq_puts(m, "-"); |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | void __symbol_put(const char *symbol) | |
1057 | { | |
1058 | struct module *owner; | |
1da177e4 | 1059 | |
24da1cbf | 1060 | preempt_disable(); |
414fd31b | 1061 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
1062 | BUG(); |
1063 | module_put(owner); | |
24da1cbf | 1064 | preempt_enable(); |
1da177e4 LT |
1065 | } |
1066 | EXPORT_SYMBOL(__symbol_put); | |
1067 | ||
7d1d16e4 | 1068 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
1069 | void symbol_put_addr(void *addr) |
1070 | { | |
5e376613 | 1071 | struct module *modaddr; |
7d1d16e4 | 1072 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 1073 | |
7d1d16e4 | 1074 | if (core_kernel_text(a)) |
5e376613 | 1075 | return; |
1da177e4 | 1076 | |
275d7d44 PZ |
1077 | /* |
1078 | * Even though we hold a reference on the module; we still need to | |
1079 | * disable preemption in order to safely traverse the data structure. | |
1080 | */ | |
1081 | preempt_disable(); | |
7d1d16e4 | 1082 | modaddr = __module_text_address(a); |
a6e6abd5 | 1083 | BUG_ON(!modaddr); |
5e376613 | 1084 | module_put(modaddr); |
275d7d44 | 1085 | preempt_enable(); |
1da177e4 LT |
1086 | } |
1087 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
1088 | ||
1089 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 1090 | struct module_kobject *mk, char *buffer) |
1da177e4 | 1091 | { |
d5db139a | 1092 | return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
1da177e4 LT |
1093 | } |
1094 | ||
cca3e707 KS |
1095 | static struct module_attribute modinfo_refcnt = |
1096 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 1097 | |
d53799be SR |
1098 | void __module_get(struct module *module) |
1099 | { | |
1100 | if (module) { | |
1101 | preempt_disable(); | |
2f35c41f | 1102 | atomic_inc(&module->refcnt); |
d53799be SR |
1103 | trace_module_get(module, _RET_IP_); |
1104 | preempt_enable(); | |
1105 | } | |
1106 | } | |
1107 | EXPORT_SYMBOL(__module_get); | |
1108 | ||
1109 | bool try_module_get(struct module *module) | |
1110 | { | |
1111 | bool ret = true; | |
1112 | ||
1113 | if (module) { | |
1114 | preempt_disable(); | |
e513cc1c MH |
1115 | /* Note: here, we can fail to get a reference */ |
1116 | if (likely(module_is_live(module) && | |
1117 | atomic_inc_not_zero(&module->refcnt) != 0)) | |
d53799be | 1118 | trace_module_get(module, _RET_IP_); |
e513cc1c | 1119 | else |
d53799be SR |
1120 | ret = false; |
1121 | ||
1122 | preempt_enable(); | |
1123 | } | |
1124 | return ret; | |
1125 | } | |
1126 | EXPORT_SYMBOL(try_module_get); | |
1127 | ||
f6a57033 AV |
1128 | void module_put(struct module *module) |
1129 | { | |
e513cc1c MH |
1130 | int ret; |
1131 | ||
f6a57033 | 1132 | if (module) { |
e1783a24 | 1133 | preempt_disable(); |
e513cc1c MH |
1134 | ret = atomic_dec_if_positive(&module->refcnt); |
1135 | WARN_ON(ret < 0); /* Failed to put refcount */ | |
ae832d1e | 1136 | trace_module_put(module, _RET_IP_); |
e1783a24 | 1137 | preempt_enable(); |
f6a57033 AV |
1138 | } |
1139 | } | |
1140 | EXPORT_SYMBOL(module_put); | |
1141 | ||
1da177e4 | 1142 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1143 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1144 | { |
1145 | /* We don't know the usage count, or what modules are using. */ | |
6da0b565 | 1146 | seq_puts(m, " - -"); |
1da177e4 LT |
1147 | } |
1148 | ||
1149 | static inline void module_unload_free(struct module *mod) | |
1150 | { | |
1151 | } | |
1152 | ||
9bea7f23 | 1153 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1154 | { |
9bea7f23 | 1155 | return strong_try_module_get(b); |
1da177e4 | 1156 | } |
9bea7f23 | 1157 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1158 | |
9f85a4bb | 1159 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1160 | { |
9f85a4bb | 1161 | return 0; |
1da177e4 LT |
1162 | } |
1163 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1164 | ||
53999bf3 KW |
1165 | static size_t module_flags_taint(struct module *mod, char *buf) |
1166 | { | |
1167 | size_t l = 0; | |
7fd8329b PM |
1168 | int i; |
1169 | ||
1170 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) { | |
1171 | if (taint_flags[i].module && test_bit(i, &mod->taints)) | |
5eb7c0d0 | 1172 | buf[l++] = taint_flags[i].c_true; |
7fd8329b | 1173 | } |
53999bf3 | 1174 | |
53999bf3 KW |
1175 | return l; |
1176 | } | |
1177 | ||
1f71740a | 1178 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1179 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1180 | { |
1181 | const char *state = "unknown"; | |
1182 | ||
4befb026 | 1183 | switch (mk->mod->state) { |
1f71740a KS |
1184 | case MODULE_STATE_LIVE: |
1185 | state = "live"; | |
1186 | break; | |
1187 | case MODULE_STATE_COMING: | |
1188 | state = "coming"; | |
1189 | break; | |
1190 | case MODULE_STATE_GOING: | |
1191 | state = "going"; | |
1192 | break; | |
0d21b0e3 RR |
1193 | default: |
1194 | BUG(); | |
1f71740a KS |
1195 | } |
1196 | return sprintf(buffer, "%s\n", state); | |
1197 | } | |
1198 | ||
cca3e707 KS |
1199 | static struct module_attribute modinfo_initstate = |
1200 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1201 | |
88bfa324 KS |
1202 | static ssize_t store_uevent(struct module_attribute *mattr, |
1203 | struct module_kobject *mk, | |
1204 | const char *buffer, size_t count) | |
1205 | { | |
1206 | enum kobject_action action; | |
1207 | ||
1208 | if (kobject_action_type(buffer, count, &action) == 0) | |
1209 | kobject_uevent(&mk->kobj, action); | |
1210 | return count; | |
1211 | } | |
1212 | ||
cca3e707 KS |
1213 | struct module_attribute module_uevent = |
1214 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1215 | ||
1216 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1217 | struct module_kobject *mk, char *buffer) | |
1218 | { | |
7523e4dc | 1219 | return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
cca3e707 KS |
1220 | } |
1221 | ||
1222 | static struct module_attribute modinfo_coresize = | |
1223 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1224 | ||
1225 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1226 | struct module_kobject *mk, char *buffer) | |
1227 | { | |
7523e4dc | 1228 | return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
cca3e707 KS |
1229 | } |
1230 | ||
1231 | static struct module_attribute modinfo_initsize = | |
1232 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1233 | ||
1234 | static ssize_t show_taint(struct module_attribute *mattr, | |
1235 | struct module_kobject *mk, char *buffer) | |
1236 | { | |
1237 | size_t l; | |
1238 | ||
1239 | l = module_flags_taint(mk->mod, buffer); | |
1240 | buffer[l++] = '\n'; | |
1241 | return l; | |
1242 | } | |
1243 | ||
1244 | static struct module_attribute modinfo_taint = | |
1245 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1246 | |
03e88ae1 | 1247 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1248 | &module_uevent, |
03e88ae1 GKH |
1249 | &modinfo_version, |
1250 | &modinfo_srcversion, | |
cca3e707 KS |
1251 | &modinfo_initstate, |
1252 | &modinfo_coresize, | |
1253 | &modinfo_initsize, | |
1254 | &modinfo_taint, | |
03e88ae1 | 1255 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1256 | &modinfo_refcnt, |
03e88ae1 GKH |
1257 | #endif |
1258 | NULL, | |
1259 | }; | |
1260 | ||
1da177e4 LT |
1261 | static const char vermagic[] = VERMAGIC_STRING; |
1262 | ||
c6e665c8 | 1263 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1264 | { |
1265 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1266 | if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b3 | 1267 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
373d4d09 | 1268 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506 LT |
1269 | return 0; |
1270 | #else | |
1271 | return -ENOEXEC; | |
1272 | #endif | |
1273 | } | |
1274 | ||
1da177e4 | 1275 | #ifdef CONFIG_MODVERSIONS |
71810db2 AB |
1276 | |
1277 | static u32 resolve_rel_crc(const s32 *crc) | |
d4703aef | 1278 | { |
71810db2 | 1279 | return *(u32 *)((void *)crc + *crc); |
d4703aef RR |
1280 | } |
1281 | ||
49019426 | 1282 | static int check_version(const struct load_info *info, |
1da177e4 | 1283 | const char *symname, |
6da0b565 | 1284 | struct module *mod, |
71810db2 | 1285 | const s32 *crc) |
1da177e4 | 1286 | { |
49019426 KC |
1287 | Elf_Shdr *sechdrs = info->sechdrs; |
1288 | unsigned int versindex = info->index.vers; | |
1da177e4 LT |
1289 | unsigned int i, num_versions; |
1290 | struct modversion_info *versions; | |
1291 | ||
1292 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1293 | if (!crc) | |
1294 | return 1; | |
1295 | ||
a5dd6970 RR |
1296 | /* No versions at all? modprobe --force does this. */ |
1297 | if (versindex == 0) | |
1298 | return try_to_force_load(mod, symname) == 0; | |
1299 | ||
1da177e4 LT |
1300 | versions = (void *) sechdrs[versindex].sh_addr; |
1301 | num_versions = sechdrs[versindex].sh_size | |
1302 | / sizeof(struct modversion_info); | |
1303 | ||
1304 | for (i = 0; i < num_versions; i++) { | |
71810db2 AB |
1305 | u32 crcval; |
1306 | ||
1da177e4 LT |
1307 | if (strcmp(versions[i].name, symname) != 0) |
1308 | continue; | |
1309 | ||
71810db2 AB |
1310 | if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
1311 | crcval = resolve_rel_crc(crc); | |
1312 | else | |
1313 | crcval = *crc; | |
1314 | if (versions[i].crc == crcval) | |
1da177e4 | 1315 | return 1; |
71810db2 AB |
1316 | pr_debug("Found checksum %X vs module %lX\n", |
1317 | crcval, versions[i].crc); | |
826e4506 | 1318 | goto bad_version; |
1da177e4 | 1319 | } |
826e4506 | 1320 | |
faaae2a5 | 1321 | /* Broken toolchain. Warn once, then let it go.. */ |
3e2e857f | 1322 | pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
faaae2a5 | 1323 | return 1; |
826e4506 LT |
1324 | |
1325 | bad_version: | |
6da0b565 | 1326 | pr_warn("%s: disagrees about version of symbol %s\n", |
3e2e857f | 1327 | info->name, symname); |
826e4506 | 1328 | return 0; |
1da177e4 LT |
1329 | } |
1330 | ||
49019426 | 1331 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1332 | struct module *mod) |
1333 | { | |
71810db2 | 1334 | const s32 *crc; |
1da177e4 | 1335 | |
926a59b1 PZ |
1336 | /* |
1337 | * Since this should be found in kernel (which can't be removed), no | |
1338 | * locking is necessary -- use preempt_disable() to placate lockdep. | |
1339 | */ | |
1340 | preempt_disable(); | |
b92021b0 | 1341 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
926a59b1 PZ |
1342 | &crc, true, false)) { |
1343 | preempt_enable(); | |
1da177e4 | 1344 | BUG(); |
926a59b1 PZ |
1345 | } |
1346 | preempt_enable(); | |
49019426 KC |
1347 | return check_version(info, VMLINUX_SYMBOL_STR(module_layout), |
1348 | mod, crc); | |
1da177e4 LT |
1349 | } |
1350 | ||
91e37a79 RR |
1351 | /* First part is kernel version, which we ignore if module has crcs. */ |
1352 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1353 | bool has_crcs) | |
1da177e4 | 1354 | { |
91e37a79 RR |
1355 | if (has_crcs) { |
1356 | amagic += strcspn(amagic, " "); | |
1357 | bmagic += strcspn(bmagic, " "); | |
1358 | } | |
1da177e4 LT |
1359 | return strcmp(amagic, bmagic) == 0; |
1360 | } | |
1361 | #else | |
49019426 | 1362 | static inline int check_version(const struct load_info *info, |
1da177e4 | 1363 | const char *symname, |
6da0b565 | 1364 | struct module *mod, |
71810db2 | 1365 | const s32 *crc) |
1da177e4 LT |
1366 | { |
1367 | return 1; | |
1368 | } | |
1369 | ||
49019426 | 1370 | static inline int check_modstruct_version(const struct load_info *info, |
1da177e4 LT |
1371 | struct module *mod) |
1372 | { | |
1373 | return 1; | |
1374 | } | |
1375 | ||
91e37a79 RR |
1376 | static inline int same_magic(const char *amagic, const char *bmagic, |
1377 | bool has_crcs) | |
1da177e4 LT |
1378 | { |
1379 | return strcmp(amagic, bmagic) == 0; | |
1380 | } | |
1381 | #endif /* CONFIG_MODVERSIONS */ | |
1382 | ||
75676500 | 1383 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1384 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1385 | const struct load_info *info, | |
414fd31b | 1386 | const char *name, |
9bea7f23 | 1387 | char ownername[]) |
1da177e4 LT |
1388 | { |
1389 | struct module *owner; | |
414fd31b | 1390 | const struct kernel_symbol *sym; |
71810db2 | 1391 | const s32 *crc; |
9bea7f23 | 1392 | int err; |
1da177e4 | 1393 | |
d64810f5 PZ |
1394 | /* |
1395 | * The module_mutex should not be a heavily contended lock; | |
1396 | * if we get the occasional sleep here, we'll go an extra iteration | |
1397 | * in the wait_event_interruptible(), which is harmless. | |
1398 | */ | |
1399 | sched_annotate_sleep(); | |
75676500 | 1400 | mutex_lock(&module_mutex); |
414fd31b | 1401 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1402 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1403 | if (!sym) |
1404 | goto unlock; | |
1405 | ||
49019426 | 1406 | if (!check_version(info, name, mod, crc)) { |
9bea7f23 RR |
1407 | sym = ERR_PTR(-EINVAL); |
1408 | goto getname; | |
1da177e4 | 1409 | } |
9bea7f23 RR |
1410 | |
1411 | err = ref_module(mod, owner); | |
1412 | if (err) { | |
1413 | sym = ERR_PTR(err); | |
1414 | goto getname; | |
1415 | } | |
1416 | ||
1417 | getname: | |
1418 | /* We must make copy under the lock if we failed to get ref. */ | |
1419 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1420 | unlock: | |
75676500 | 1421 | mutex_unlock(&module_mutex); |
218ce735 | 1422 | return sym; |
1da177e4 LT |
1423 | } |
1424 | ||
49668688 RR |
1425 | static const struct kernel_symbol * |
1426 | resolve_symbol_wait(struct module *mod, | |
1427 | const struct load_info *info, | |
1428 | const char *name) | |
9bea7f23 RR |
1429 | { |
1430 | const struct kernel_symbol *ksym; | |
49668688 | 1431 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1432 | |
1433 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1434 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1435 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 | 1436 | 30 * HZ) <= 0) { |
bddb12b3 AM |
1437 | pr_warn("%s: gave up waiting for init of module %s.\n", |
1438 | mod->name, owner); | |
9bea7f23 RR |
1439 | } |
1440 | return ksym; | |
1441 | } | |
1442 | ||
1da177e4 LT |
1443 | /* |
1444 | * /sys/module/foo/sections stuff | |
1445 | * J. Corbet <corbet@lwn.net> | |
1446 | */ | |
8f6d0378 | 1447 | #ifdef CONFIG_SYSFS |
10b465aa | 1448 | |
8f6d0378 | 1449 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1450 | static inline bool sect_empty(const Elf_Shdr *sect) |
1451 | { | |
1452 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1453 | } | |
1454 | ||
6da0b565 | 1455 | struct module_sect_attr { |
a58730c4 RR |
1456 | struct module_attribute mattr; |
1457 | char *name; | |
1458 | unsigned long address; | |
1459 | }; | |
1460 | ||
6da0b565 | 1461 | struct module_sect_attrs { |
a58730c4 RR |
1462 | struct attribute_group grp; |
1463 | unsigned int nsections; | |
1464 | struct module_sect_attr attrs[0]; | |
1465 | }; | |
1466 | ||
1da177e4 | 1467 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1468 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1469 | { |
1470 | struct module_sect_attr *sattr = | |
1471 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1472 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1473 | } |
1474 | ||
04b1db9f IN |
1475 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1476 | { | |
a58730c4 | 1477 | unsigned int section; |
04b1db9f IN |
1478 | |
1479 | for (section = 0; section < sect_attrs->nsections; section++) | |
1480 | kfree(sect_attrs->attrs[section].name); | |
1481 | kfree(sect_attrs); | |
1482 | } | |
1483 | ||
8f6d0378 | 1484 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1485 | { |
1486 | unsigned int nloaded = 0, i, size[2]; | |
1487 | struct module_sect_attrs *sect_attrs; | |
1488 | struct module_sect_attr *sattr; | |
1489 | struct attribute **gattr; | |
22a8bdeb | 1490 | |
1da177e4 | 1491 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1492 | for (i = 0; i < info->hdr->e_shnum; i++) |
1493 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1494 | nloaded++; |
1495 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1496 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1497 | sizeof(sect_attrs->grp.attrs[0])); | |
1498 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1499 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1500 | if (sect_attrs == NULL) | |
1da177e4 LT |
1501 | return; |
1502 | ||
1503 | /* Setup section attributes. */ | |
1504 | sect_attrs->grp.name = "sections"; | |
1505 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1506 | ||
04b1db9f | 1507 | sect_attrs->nsections = 0; |
1da177e4 LT |
1508 | sattr = §_attrs->attrs[0]; |
1509 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1510 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1511 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1512 | if (sect_empty(sec)) | |
35dead42 | 1513 | continue; |
8f6d0378 RR |
1514 | sattr->address = sec->sh_addr; |
1515 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1516 | GFP_KERNEL); |
1517 | if (sattr->name == NULL) | |
1518 | goto out; | |
1519 | sect_attrs->nsections++; | |
361795b1 | 1520 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1521 | sattr->mattr.show = module_sect_show; |
1522 | sattr->mattr.store = NULL; | |
1523 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1524 | sattr->mattr.attr.mode = S_IRUGO; |
1525 | *(gattr++) = &(sattr++)->mattr.attr; | |
1526 | } | |
1527 | *gattr = NULL; | |
1528 | ||
1529 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1530 | goto out; | |
1531 | ||
1532 | mod->sect_attrs = sect_attrs; | |
1533 | return; | |
1534 | out: | |
04b1db9f | 1535 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1536 | } |
1537 | ||
1538 | static void remove_sect_attrs(struct module *mod) | |
1539 | { | |
1540 | if (mod->sect_attrs) { | |
1541 | sysfs_remove_group(&mod->mkobj.kobj, | |
1542 | &mod->sect_attrs->grp); | |
1543 | /* We are positive that no one is using any sect attrs | |
1544 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1545 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1546 | mod->sect_attrs = NULL; |
1547 | } | |
1548 | } | |
1549 | ||
6d760133 RM |
1550 | /* |
1551 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1552 | */ | |
1553 | ||
1554 | struct module_notes_attrs { | |
1555 | struct kobject *dir; | |
1556 | unsigned int notes; | |
1557 | struct bin_attribute attrs[0]; | |
1558 | }; | |
1559 | ||
2c3c8bea | 1560 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1561 | struct bin_attribute *bin_attr, |
1562 | char *buf, loff_t pos, size_t count) | |
1563 | { | |
1564 | /* | |
1565 | * The caller checked the pos and count against our size. | |
1566 | */ | |
1567 | memcpy(buf, bin_attr->private + pos, count); | |
1568 | return count; | |
1569 | } | |
1570 | ||
1571 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1572 | unsigned int i) | |
1573 | { | |
1574 | if (notes_attrs->dir) { | |
1575 | while (i-- > 0) | |
1576 | sysfs_remove_bin_file(notes_attrs->dir, | |
1577 | ¬es_attrs->attrs[i]); | |
e9432093 | 1578 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1579 | } |
1580 | kfree(notes_attrs); | |
1581 | } | |
1582 | ||
8f6d0378 | 1583 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1584 | { |
1585 | unsigned int notes, loaded, i; | |
1586 | struct module_notes_attrs *notes_attrs; | |
1587 | struct bin_attribute *nattr; | |
1588 | ||
ea6bff36 IM |
1589 | /* failed to create section attributes, so can't create notes */ |
1590 | if (!mod->sect_attrs) | |
1591 | return; | |
1592 | ||
6d760133 RM |
1593 | /* Count notes sections and allocate structures. */ |
1594 | notes = 0; | |
8f6d0378 RR |
1595 | for (i = 0; i < info->hdr->e_shnum; i++) |
1596 | if (!sect_empty(&info->sechdrs[i]) && | |
1597 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1598 | ++notes; |
1599 | ||
1600 | if (notes == 0) | |
1601 | return; | |
1602 | ||
1603 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1604 | + notes * sizeof(notes_attrs->attrs[0]), | |
1605 | GFP_KERNEL); | |
1606 | if (notes_attrs == NULL) | |
1607 | return; | |
1608 | ||
1609 | notes_attrs->notes = notes; | |
1610 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1611 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1612 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1613 | continue; |
8f6d0378 | 1614 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1615 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1616 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1617 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1618 | nattr->size = info->sechdrs[i].sh_size; |
1619 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1620 | nattr->read = module_notes_read; |
1621 | ++nattr; | |
1622 | } | |
1623 | ++loaded; | |
1624 | } | |
1625 | ||
4ff6abff | 1626 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1627 | if (!notes_attrs->dir) |
1628 | goto out; | |
1629 | ||
1630 | for (i = 0; i < notes; ++i) | |
1631 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1632 | ¬es_attrs->attrs[i])) | |
1633 | goto out; | |
1634 | ||
1635 | mod->notes_attrs = notes_attrs; | |
1636 | return; | |
1637 | ||
1638 | out: | |
1639 | free_notes_attrs(notes_attrs, i); | |
1640 | } | |
1641 | ||
1642 | static void remove_notes_attrs(struct module *mod) | |
1643 | { | |
1644 | if (mod->notes_attrs) | |
1645 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1646 | } | |
1647 | ||
1da177e4 | 1648 | #else |
04b1db9f | 1649 | |
8f6d0378 RR |
1650 | static inline void add_sect_attrs(struct module *mod, |
1651 | const struct load_info *info) | |
1da177e4 LT |
1652 | { |
1653 | } | |
1654 | ||
1655 | static inline void remove_sect_attrs(struct module *mod) | |
1656 | { | |
1657 | } | |
6d760133 | 1658 | |
8f6d0378 RR |
1659 | static inline void add_notes_attrs(struct module *mod, |
1660 | const struct load_info *info) | |
6d760133 RM |
1661 | { |
1662 | } | |
1663 | ||
1664 | static inline void remove_notes_attrs(struct module *mod) | |
1665 | { | |
1666 | } | |
8f6d0378 | 1667 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1668 | |
1ba5c08b | 1669 | static void del_usage_links(struct module *mod) |
80a3d1bb RR |
1670 | { |
1671 | #ifdef CONFIG_MODULE_UNLOAD | |
1672 | struct module_use *use; | |
80a3d1bb | 1673 | |
75676500 | 1674 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1675 | list_for_each_entry(use, &mod->target_list, target_list) |
1676 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1677 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1678 | #endif |
1679 | } | |
1680 | ||
1ba5c08b | 1681 | static int add_usage_links(struct module *mod) |
80a3d1bb | 1682 | { |
1ba5c08b | 1683 | int ret = 0; |
80a3d1bb RR |
1684 | #ifdef CONFIG_MODULE_UNLOAD |
1685 | struct module_use *use; | |
1686 | ||
75676500 | 1687 | mutex_lock(&module_mutex); |
1ba5c08b CL |
1688 | list_for_each_entry(use, &mod->target_list, target_list) { |
1689 | ret = sysfs_create_link(use->target->holders_dir, | |
1690 | &mod->mkobj.kobj, mod->name); | |
1691 | if (ret) | |
1692 | break; | |
1693 | } | |
75676500 | 1694 | mutex_unlock(&module_mutex); |
1ba5c08b CL |
1695 | if (ret) |
1696 | del_usage_links(mod); | |
80a3d1bb | 1697 | #endif |
1ba5c08b | 1698 | return ret; |
80a3d1bb RR |
1699 | } |
1700 | ||
6407ebb2 | 1701 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1702 | { |
1703 | struct module_attribute *attr; | |
03e88ae1 | 1704 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1705 | int error = 0; |
1706 | int i; | |
1707 | ||
03e88ae1 GKH |
1708 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1709 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1710 | GFP_KERNEL); | |
1711 | if (!mod->modinfo_attrs) | |
1712 | return -ENOMEM; | |
1713 | ||
1714 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 | 1715 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
c75b590d | 1716 | if (!attr->test || attr->test(mod)) { |
03e88ae1 | 1717 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1 | 1718 | sysfs_attr_init(&temp_attr->attr); |
6da0b565 IA |
1719 | error = sysfs_create_file(&mod->mkobj.kobj, |
1720 | &temp_attr->attr); | |
03e88ae1 GKH |
1721 | ++temp_attr; |
1722 | } | |
c988d2b2 MD |
1723 | } |
1724 | return error; | |
1725 | } | |
1726 | ||
6407ebb2 | 1727 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1728 | { |
1729 | struct module_attribute *attr; | |
1730 | int i; | |
1731 | ||
03e88ae1 GKH |
1732 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1733 | /* pick a field to test for end of list */ | |
1734 | if (!attr->attr.name) | |
1735 | break; | |
6da0b565 | 1736 | sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1 GKH |
1737 | if (attr->free) |
1738 | attr->free(mod); | |
c988d2b2 | 1739 | } |
03e88ae1 | 1740 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1741 | } |
1da177e4 | 1742 | |
942e4431 LZ |
1743 | static void mod_kobject_put(struct module *mod) |
1744 | { | |
1745 | DECLARE_COMPLETION_ONSTACK(c); | |
1746 | mod->mkobj.kobj_completion = &c; | |
1747 | kobject_put(&mod->mkobj.kobj); | |
1748 | wait_for_completion(&c); | |
1749 | } | |
1750 | ||
6407ebb2 | 1751 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1752 | { |
1753 | int err; | |
6494a93d | 1754 | struct kobject *kobj; |
1da177e4 | 1755 | |
823bccfc | 1756 | if (!module_sysfs_initialized) { |
bddb12b3 | 1757 | pr_err("%s: module sysfs not initialized\n", mod->name); |
1cc5f714 ES |
1758 | err = -EINVAL; |
1759 | goto out; | |
1760 | } | |
6494a93d GKH |
1761 | |
1762 | kobj = kset_find_obj(module_kset, mod->name); | |
1763 | if (kobj) { | |
bddb12b3 | 1764 | pr_err("%s: module is already loaded\n", mod->name); |
6494a93d GKH |
1765 | kobject_put(kobj); |
1766 | err = -EINVAL; | |
1767 | goto out; | |
1768 | } | |
1769 | ||
1da177e4 | 1770 | mod->mkobj.mod = mod; |
e17e0f51 | 1771 | |
ac3c8141 GKH |
1772 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1773 | mod->mkobj.kobj.kset = module_kset; | |
1774 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1775 | "%s", mod->name); | |
1776 | if (err) | |
942e4431 | 1777 | mod_kobject_put(mod); |
270a6c4c | 1778 | |
97c146ef | 1779 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1780 | out: |
1781 | return err; | |
1782 | } | |
1783 | ||
6407ebb2 | 1784 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1785 | const struct load_info *info, |
270a6c4c KS |
1786 | struct kernel_param *kparam, |
1787 | unsigned int num_params) | |
1788 | { | |
1789 | int err; | |
1790 | ||
80a3d1bb RR |
1791 | err = mod_sysfs_init(mod); |
1792 | if (err) | |
1793 | goto out; | |
1794 | ||
4ff6abff | 1795 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1796 | if (!mod->holders_dir) { |
1797 | err = -ENOMEM; | |
270a6c4c | 1798 | goto out_unreg; |
240936e1 | 1799 | } |
270a6c4c | 1800 | |
1da177e4 LT |
1801 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1802 | if (err) | |
270a6c4c | 1803 | goto out_unreg_holders; |
1da177e4 | 1804 | |
c988d2b2 MD |
1805 | err = module_add_modinfo_attrs(mod); |
1806 | if (err) | |
e17e0f51 | 1807 | goto out_unreg_param; |
c988d2b2 | 1808 | |
1ba5c08b CL |
1809 | err = add_usage_links(mod); |
1810 | if (err) | |
1811 | goto out_unreg_modinfo_attrs; | |
1812 | ||
8f6d0378 RR |
1813 | add_sect_attrs(mod, info); |
1814 | add_notes_attrs(mod, info); | |
80a3d1bb | 1815 | |
e17e0f51 | 1816 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1817 | return 0; |
1818 | ||
1ba5c08b CL |
1819 | out_unreg_modinfo_attrs: |
1820 | module_remove_modinfo_attrs(mod); | |
e17e0f51 KS |
1821 | out_unreg_param: |
1822 | module_param_sysfs_remove(mod); | |
270a6c4c | 1823 | out_unreg_holders: |
78a2d906 | 1824 | kobject_put(mod->holders_dir); |
270a6c4c | 1825 | out_unreg: |
942e4431 | 1826 | mod_kobject_put(mod); |
80a3d1bb | 1827 | out: |
1da177e4 LT |
1828 | return err; |
1829 | } | |
34e4e2fe DL |
1830 | |
1831 | static void mod_sysfs_fini(struct module *mod) | |
1832 | { | |
8f6d0378 RR |
1833 | remove_notes_attrs(mod); |
1834 | remove_sect_attrs(mod); | |
942e4431 | 1835 | mod_kobject_put(mod); |
34e4e2fe DL |
1836 | } |
1837 | ||
cf2fde7b RR |
1838 | static void init_param_lock(struct module *mod) |
1839 | { | |
1840 | mutex_init(&mod->param_lock); | |
1841 | } | |
8f6d0378 | 1842 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1843 | |
8f6d0378 RR |
1844 | static int mod_sysfs_setup(struct module *mod, |
1845 | const struct load_info *info, | |
6407ebb2 RR |
1846 | struct kernel_param *kparam, |
1847 | unsigned int num_params) | |
1848 | { | |
1849 | return 0; | |
1850 | } | |
1851 | ||
34e4e2fe DL |
1852 | static void mod_sysfs_fini(struct module *mod) |
1853 | { | |
1854 | } | |
1855 | ||
36b0360d RR |
1856 | static void module_remove_modinfo_attrs(struct module *mod) |
1857 | { | |
1858 | } | |
1859 | ||
80a3d1bb RR |
1860 | static void del_usage_links(struct module *mod) |
1861 | { | |
1862 | } | |
1863 | ||
cf2fde7b RR |
1864 | static void init_param_lock(struct module *mod) |
1865 | { | |
1866 | } | |
34e4e2fe | 1867 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1868 | |
36b0360d | 1869 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1870 | { |
80a3d1bb | 1871 | del_usage_links(mod); |
c988d2b2 | 1872 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1873 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1874 | kobject_put(mod->mkobj.drivers_dir); |
1875 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1876 | mod_sysfs_fini(mod); |
1da177e4 LT |
1877 | } |
1878 | ||
0f5bf6d0 | 1879 | #ifdef CONFIG_STRICT_MODULE_RWX |
84e1c6bb | 1880 | /* |
1881 | * LKM RO/NX protection: protect module's text/ro-data | |
1882 | * from modification and any data from execution. | |
85c898db RR |
1883 | * |
1884 | * General layout of module is: | |
444d13ff JY |
1885 | * [text] [read-only-data] [ro-after-init] [writable data] |
1886 | * text_size -----^ ^ ^ ^ | |
1887 | * ro_size ------------------------| | | | |
1888 | * ro_after_init_size -----------------------------| | | |
1889 | * size -----------------------------------------------------------| | |
85c898db RR |
1890 | * |
1891 | * These values are always page-aligned (as is base) | |
84e1c6bb | 1892 | */ |
85c898db RR |
1893 | static void frob_text(const struct module_layout *layout, |
1894 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1895 | { |
85c898db RR |
1896 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1897 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1898 | set_memory((unsigned long)layout->base, | |
1899 | layout->text_size >> PAGE_SHIFT); | |
84e1c6bb | 1900 | } |
84e1c6bb | 1901 | |
85c898db RR |
1902 | static void frob_rodata(const struct module_layout *layout, |
1903 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1904 | { |
85c898db RR |
1905 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
1906 | BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); | |
1907 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1908 | set_memory((unsigned long)layout->base + layout->text_size, | |
1909 | (layout->ro_size - layout->text_size) >> PAGE_SHIFT); | |
84e1c6bb | 1910 | } |
1911 | ||
444d13ff JY |
1912 | static void frob_ro_after_init(const struct module_layout *layout, |
1913 | int (*set_memory)(unsigned long start, int num_pages)) | |
1914 | { | |
1915 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); | |
1916 | BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); | |
1917 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); | |
1918 | set_memory((unsigned long)layout->base + layout->ro_size, | |
1919 | (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); | |
1920 | } | |
1921 | ||
85c898db RR |
1922 | static void frob_writable_data(const struct module_layout *layout, |
1923 | int (*set_memory)(unsigned long start, int num_pages)) | |
84e1c6bb | 1924 | { |
85c898db | 1925 | BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
444d13ff | 1926 | BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
85c898db | 1927 | BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
444d13ff JY |
1928 | set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
1929 | (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); | |
84e1c6bb | 1930 | } |
84e1c6bb | 1931 | |
85c898db RR |
1932 | /* livepatching wants to disable read-only so it can frob module. */ |
1933 | void module_disable_ro(const struct module *mod) | |
20ef10c1 | 1934 | { |
39290b38 AT |
1935 | if (!rodata_enabled) |
1936 | return; | |
1937 | ||
85c898db RR |
1938 | frob_text(&mod->core_layout, set_memory_rw); |
1939 | frob_rodata(&mod->core_layout, set_memory_rw); | |
444d13ff | 1940 | frob_ro_after_init(&mod->core_layout, set_memory_rw); |
85c898db RR |
1941 | frob_text(&mod->init_layout, set_memory_rw); |
1942 | frob_rodata(&mod->init_layout, set_memory_rw); | |
20ef10c1 | 1943 | } |
84e1c6bb | 1944 | |
444d13ff | 1945 | void module_enable_ro(const struct module *mod, bool after_init) |
01526ed0 | 1946 | { |
39290b38 AT |
1947 | if (!rodata_enabled) |
1948 | return; | |
1949 | ||
85c898db RR |
1950 | frob_text(&mod->core_layout, set_memory_ro); |
1951 | frob_rodata(&mod->core_layout, set_memory_ro); | |
1952 | frob_text(&mod->init_layout, set_memory_ro); | |
1953 | frob_rodata(&mod->init_layout, set_memory_ro); | |
444d13ff JY |
1954 | |
1955 | if (after_init) | |
1956 | frob_ro_after_init(&mod->core_layout, set_memory_ro); | |
84e1c6bb | 1957 | } |
1958 | ||
85c898db | 1959 | static void module_enable_nx(const struct module *mod) |
01526ed0 | 1960 | { |
85c898db | 1961 | frob_rodata(&mod->core_layout, set_memory_nx); |
444d13ff | 1962 | frob_ro_after_init(&mod->core_layout, set_memory_nx); |
85c898db RR |
1963 | frob_writable_data(&mod->core_layout, set_memory_nx); |
1964 | frob_rodata(&mod->init_layout, set_memory_nx); | |
1965 | frob_writable_data(&mod->init_layout, set_memory_nx); | |
01526ed0 JG |
1966 | } |
1967 | ||
85c898db | 1968 | static void module_disable_nx(const struct module *mod) |
01526ed0 | 1969 | { |
85c898db | 1970 | frob_rodata(&mod->core_layout, set_memory_x); |
444d13ff | 1971 | frob_ro_after_init(&mod->core_layout, set_memory_x); |
85c898db RR |
1972 | frob_writable_data(&mod->core_layout, set_memory_x); |
1973 | frob_rodata(&mod->init_layout, set_memory_x); | |
1974 | frob_writable_data(&mod->init_layout, set_memory_x); | |
84e1c6bb | 1975 | } |
1976 | ||
1977 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1978 | void set_all_modules_text_rw(void) |
84e1c6bb | 1979 | { |
1980 | struct module *mod; | |
1981 | ||
39290b38 AT |
1982 | if (!rodata_enabled) |
1983 | return; | |
1984 | ||
84e1c6bb | 1985 | mutex_lock(&module_mutex); |
1986 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1987 | if (mod->state == MODULE_STATE_UNFORMED) |
1988 | continue; | |
85c898db RR |
1989 | |
1990 | frob_text(&mod->core_layout, set_memory_rw); | |
1991 | frob_text(&mod->init_layout, set_memory_rw); | |
84e1c6bb | 1992 | } |
1993 | mutex_unlock(&module_mutex); | |
1994 | } | |
1995 | ||
1996 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1997 | void set_all_modules_text_ro(void) |
84e1c6bb | 1998 | { |
1999 | struct module *mod; | |
2000 | ||
39290b38 AT |
2001 | if (!rodata_enabled) |
2002 | return; | |
2003 | ||
84e1c6bb | 2004 | mutex_lock(&module_mutex); |
2005 | list_for_each_entry_rcu(mod, &modules, list) { | |
905dd707 AT |
2006 | /* |
2007 | * Ignore going modules since it's possible that ro | |
2008 | * protection has already been disabled, otherwise we'll | |
2009 | * run into protection faults at module deallocation. | |
2010 | */ | |
2011 | if (mod->state == MODULE_STATE_UNFORMED || | |
2012 | mod->state == MODULE_STATE_GOING) | |
0d21b0e3 | 2013 | continue; |
85c898db RR |
2014 | |
2015 | frob_text(&mod->core_layout, set_memory_ro); | |
2016 | frob_text(&mod->init_layout, set_memory_ro); | |
84e1c6bb | 2017 | } |
2018 | mutex_unlock(&module_mutex); | |
2019 | } | |
85c898db RR |
2020 | |
2021 | static void disable_ro_nx(const struct module_layout *layout) | |
2022 | { | |
39290b38 AT |
2023 | if (rodata_enabled) { |
2024 | frob_text(layout, set_memory_rw); | |
2025 | frob_rodata(layout, set_memory_rw); | |
2026 | frob_ro_after_init(layout, set_memory_rw); | |
2027 | } | |
85c898db | 2028 | frob_rodata(layout, set_memory_x); |
444d13ff | 2029 | frob_ro_after_init(layout, set_memory_x); |
85c898db RR |
2030 | frob_writable_data(layout, set_memory_x); |
2031 | } | |
2032 | ||
84e1c6bb | 2033 | #else |
85c898db RR |
2034 | static void disable_ro_nx(const struct module_layout *layout) { } |
2035 | static void module_enable_nx(const struct module *mod) { } | |
2036 | static void module_disable_nx(const struct module *mod) { } | |
84e1c6bb | 2037 | #endif |
2038 | ||
1ce15ef4 JY |
2039 | #ifdef CONFIG_LIVEPATCH |
2040 | /* | |
2041 | * Persist Elf information about a module. Copy the Elf header, | |
2042 | * section header table, section string table, and symtab section | |
2043 | * index from info to mod->klp_info. | |
2044 | */ | |
2045 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2046 | { | |
2047 | unsigned int size, symndx; | |
2048 | int ret; | |
2049 | ||
2050 | size = sizeof(*mod->klp_info); | |
2051 | mod->klp_info = kmalloc(size, GFP_KERNEL); | |
2052 | if (mod->klp_info == NULL) | |
2053 | return -ENOMEM; | |
2054 | ||
2055 | /* Elf header */ | |
2056 | size = sizeof(mod->klp_info->hdr); | |
2057 | memcpy(&mod->klp_info->hdr, info->hdr, size); | |
2058 | ||
2059 | /* Elf section header table */ | |
2060 | size = sizeof(*info->sechdrs) * info->hdr->e_shnum; | |
2061 | mod->klp_info->sechdrs = kmalloc(size, GFP_KERNEL); | |
2062 | if (mod->klp_info->sechdrs == NULL) { | |
2063 | ret = -ENOMEM; | |
2064 | goto free_info; | |
2065 | } | |
2066 | memcpy(mod->klp_info->sechdrs, info->sechdrs, size); | |
2067 | ||
2068 | /* Elf section name string table */ | |
2069 | size = info->sechdrs[info->hdr->e_shstrndx].sh_size; | |
2070 | mod->klp_info->secstrings = kmalloc(size, GFP_KERNEL); | |
2071 | if (mod->klp_info->secstrings == NULL) { | |
2072 | ret = -ENOMEM; | |
2073 | goto free_sechdrs; | |
2074 | } | |
2075 | memcpy(mod->klp_info->secstrings, info->secstrings, size); | |
2076 | ||
2077 | /* Elf symbol section index */ | |
2078 | symndx = info->index.sym; | |
2079 | mod->klp_info->symndx = symndx; | |
2080 | ||
2081 | /* | |
2082 | * For livepatch modules, core_kallsyms.symtab is a complete | |
2083 | * copy of the original symbol table. Adjust sh_addr to point | |
2084 | * to core_kallsyms.symtab since the copy of the symtab in module | |
2085 | * init memory is freed at the end of do_init_module(). | |
2086 | */ | |
2087 | mod->klp_info->sechdrs[symndx].sh_addr = \ | |
2088 | (unsigned long) mod->core_kallsyms.symtab; | |
2089 | ||
2090 | return 0; | |
2091 | ||
2092 | free_sechdrs: | |
2093 | kfree(mod->klp_info->sechdrs); | |
2094 | free_info: | |
2095 | kfree(mod->klp_info); | |
2096 | return ret; | |
2097 | } | |
2098 | ||
2099 | static void free_module_elf(struct module *mod) | |
2100 | { | |
2101 | kfree(mod->klp_info->sechdrs); | |
2102 | kfree(mod->klp_info->secstrings); | |
2103 | kfree(mod->klp_info); | |
2104 | } | |
2105 | #else /* !CONFIG_LIVEPATCH */ | |
2106 | static int copy_module_elf(struct module *mod, struct load_info *info) | |
2107 | { | |
2108 | return 0; | |
2109 | } | |
2110 | ||
2111 | static void free_module_elf(struct module *mod) | |
2112 | { | |
2113 | } | |
2114 | #endif /* CONFIG_LIVEPATCH */ | |
2115 | ||
be1f221c | 2116 | void __weak module_memfree(void *module_region) |
74e08fcf JB |
2117 | { |
2118 | vfree(module_region); | |
2119 | } | |
2120 | ||
2121 | void __weak module_arch_cleanup(struct module *mod) | |
2122 | { | |
2123 | } | |
2124 | ||
d453cded RR |
2125 | void __weak module_arch_freeing_init(struct module *mod) |
2126 | { | |
2127 | } | |
2128 | ||
75676500 | 2129 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
2130 | static void free_module(struct module *mod) |
2131 | { | |
7ead8b83 LZ |
2132 | trace_module_free(mod); |
2133 | ||
36b0360d | 2134 | mod_sysfs_teardown(mod); |
1da177e4 | 2135 | |
944a1fa0 RR |
2136 | /* We leave it in list to prevent duplicate loads, but make sure |
2137 | * that noone uses it while it's being deconstructed. */ | |
d3051b48 | 2138 | mutex_lock(&module_mutex); |
944a1fa0 | 2139 | mod->state = MODULE_STATE_UNFORMED; |
d3051b48 | 2140 | mutex_unlock(&module_mutex); |
944a1fa0 | 2141 | |
b82bab4b JB |
2142 | /* Remove dynamic debug info */ |
2143 | ddebug_remove_module(mod->name); | |
2144 | ||
1da177e4 LT |
2145 | /* Arch-specific cleanup. */ |
2146 | module_arch_cleanup(mod); | |
2147 | ||
2148 | /* Module unload stuff */ | |
2149 | module_unload_free(mod); | |
2150 | ||
e180a6b7 RR |
2151 | /* Free any allocated parameters. */ |
2152 | destroy_params(mod->kp, mod->num_kp); | |
2153 | ||
1ce15ef4 JY |
2154 | if (is_livepatch_module(mod)) |
2155 | free_module_elf(mod); | |
2156 | ||
944a1fa0 RR |
2157 | /* Now we can delete it from the lists */ |
2158 | mutex_lock(&module_mutex); | |
461e34ae MH |
2159 | /* Unlink carefully: kallsyms could be walking list. */ |
2160 | list_del_rcu(&mod->list); | |
93c2e105 | 2161 | mod_tree_remove(mod); |
0286b5ea | 2162 | /* Remove this module from bug list, this uses list_del_rcu */ |
461e34ae | 2163 | module_bug_cleanup(mod); |
0be964be PZ |
2164 | /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
2165 | synchronize_sched(); | |
944a1fa0 RR |
2166 | mutex_unlock(&module_mutex); |
2167 | ||
85c898db RR |
2168 | /* This may be empty, but that's OK */ |
2169 | disable_ro_nx(&mod->init_layout); | |
d453cded | 2170 | module_arch_freeing_init(mod); |
7523e4dc | 2171 | module_memfree(mod->init_layout.base); |
1da177e4 | 2172 | kfree(mod->args); |
259354de | 2173 | percpu_modfree(mod); |
9f85a4bb | 2174 | |
35a9393c | 2175 | /* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc | 2176 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce95 | 2177 | |
1da177e4 | 2178 | /* Finally, free the core (containing the module structure) */ |
85c898db | 2179 | disable_ro_nx(&mod->core_layout); |
7523e4dc | 2180 | module_memfree(mod->core_layout.base); |
eb8cdec4 BS |
2181 | |
2182 | #ifdef CONFIG_MPU | |
2183 | update_protections(current->mm); | |
2184 | #endif | |
1da177e4 LT |
2185 | } |
2186 | ||
2187 | void *__symbol_get(const char *symbol) | |
2188 | { | |
2189 | struct module *owner; | |
414fd31b | 2190 | const struct kernel_symbol *sym; |
1da177e4 | 2191 | |
24da1cbf | 2192 | preempt_disable(); |
414fd31b TA |
2193 | sym = find_symbol(symbol, &owner, NULL, true, true); |
2194 | if (sym && strong_try_module_get(owner)) | |
2195 | sym = NULL; | |
24da1cbf | 2196 | preempt_enable(); |
1da177e4 | 2197 | |
414fd31b | 2198 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
2199 | } |
2200 | EXPORT_SYMBOL_GPL(__symbol_get); | |
2201 | ||
eea8b54d AN |
2202 | /* |
2203 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 2204 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
2205 | * |
2206 | * You must hold the module_mutex. | |
eea8b54d AN |
2207 | */ |
2208 | static int verify_export_symbols(struct module *mod) | |
2209 | { | |
b211104d | 2210 | unsigned int i; |
eea8b54d | 2211 | struct module *owner; |
b211104d RR |
2212 | const struct kernel_symbol *s; |
2213 | struct { | |
2214 | const struct kernel_symbol *sym; | |
2215 | unsigned int num; | |
2216 | } arr[] = { | |
2217 | { mod->syms, mod->num_syms }, | |
2218 | { mod->gpl_syms, mod->num_gpl_syms }, | |
2219 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 2220 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
2221 | { mod->unused_syms, mod->num_unused_syms }, |
2222 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 2223 | #endif |
b211104d | 2224 | }; |
eea8b54d | 2225 | |
b211104d RR |
2226 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
2227 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 2228 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b3 | 2229 | pr_err("%s: exports duplicate symbol %s" |
b211104d RR |
2230 | " (owned by %s)\n", |
2231 | mod->name, s->name, module_name(owner)); | |
2232 | return -ENOEXEC; | |
2233 | } | |
eea8b54d | 2234 | } |
b211104d RR |
2235 | } |
2236 | return 0; | |
eea8b54d AN |
2237 | } |
2238 | ||
9a4b9708 | 2239 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
2240 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
2241 | { | |
2242 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
2243 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 2244 | unsigned long secbase; |
49668688 | 2245 | unsigned int i; |
1da177e4 | 2246 | int ret = 0; |
414fd31b | 2247 | const struct kernel_symbol *ksym; |
1da177e4 | 2248 | |
49668688 RR |
2249 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
2250 | const char *name = info->strtab + sym[i].st_name; | |
2251 | ||
1da177e4 LT |
2252 | switch (sym[i].st_shndx) { |
2253 | case SHN_COMMON: | |
80375980 JM |
2254 | /* Ignore common symbols */ |
2255 | if (!strncmp(name, "__gnu_lto", 9)) | |
2256 | break; | |
2257 | ||
1da177e4 LT |
2258 | /* We compiled with -fno-common. These are not |
2259 | supposed to happen. */ | |
5e124169 | 2260 | pr_debug("Common symbol: %s\n", name); |
6da0b565 | 2261 | pr_warn("%s: please compile with -fno-common\n", |
1da177e4 LT |
2262 | mod->name); |
2263 | ret = -ENOEXEC; | |
2264 | break; | |
2265 | ||
2266 | case SHN_ABS: | |
2267 | /* Don't need to do anything */ | |
5e124169 | 2268 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
2269 | (long)sym[i].st_value); |
2270 | break; | |
2271 | ||
1ce15ef4 JY |
2272 | case SHN_LIVEPATCH: |
2273 | /* Livepatch symbols are resolved by livepatch */ | |
2274 | break; | |
2275 | ||
1da177e4 | 2276 | case SHN_UNDEF: |
49668688 | 2277 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 2278 | /* Ok if resolved. */ |
9bea7f23 | 2279 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 2280 | sym[i].st_value = ksym->value; |
1da177e4 | 2281 | break; |
414fd31b TA |
2282 | } |
2283 | ||
1da177e4 | 2284 | /* Ok if weak. */ |
9bea7f23 | 2285 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
2286 | break; |
2287 | ||
bddb12b3 AM |
2288 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
2289 | mod->name, name, PTR_ERR(ksym)); | |
9bea7f23 | 2290 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
2291 | break; |
2292 | ||
2293 | default: | |
2294 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2295 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2296 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2297 | else |
49668688 | 2298 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2299 | sym[i].st_value += secbase; |
2300 | break; | |
2301 | } | |
2302 | } | |
2303 | ||
2304 | return ret; | |
2305 | } | |
2306 | ||
49668688 | 2307 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2308 | { |
2309 | unsigned int i; | |
2310 | int err = 0; | |
2311 | ||
2312 | /* Now do relocations. */ | |
49668688 RR |
2313 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2314 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2315 | |
2316 | /* Not a valid relocation section? */ | |
49668688 | 2317 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2318 | continue; |
2319 | ||
2320 | /* Don't bother with non-allocated sections */ | |
49668688 | 2321 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2322 | continue; |
2323 | ||
1ce15ef4 JY |
2324 | /* Livepatch relocation sections are applied by livepatch */ |
2325 | if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) | |
2326 | continue; | |
2327 | ||
49668688 RR |
2328 | if (info->sechdrs[i].sh_type == SHT_REL) |
2329 | err = apply_relocate(info->sechdrs, info->strtab, | |
2330 | info->index.sym, i, mod); | |
2331 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2332 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2333 | info->index.sym, i, mod); | |
22e268eb RR |
2334 | if (err < 0) |
2335 | break; | |
2336 | } | |
2337 | return err; | |
2338 | } | |
2339 | ||
088af9a6 HD |
2340 | /* Additional bytes needed by arch in front of individual sections */ |
2341 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2342 | unsigned int section) | |
2343 | { | |
2344 | /* default implementation just returns zero */ | |
2345 | return 0; | |
2346 | } | |
2347 | ||
1da177e4 | 2348 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2349 | static long get_offset(struct module *mod, unsigned int *size, |
2350 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2351 | { |
2352 | long ret; | |
2353 | ||
088af9a6 | 2354 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2355 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2356 | *size = ret + sechdr->sh_size; | |
2357 | return ret; | |
2358 | } | |
2359 | ||
2360 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2361 | might -- code, read-only data, read-write data, small data. Tally | |
2362 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2363 | belongs in init. */ | |
49668688 | 2364 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2365 | { |
2366 | static unsigned long const masks[][2] = { | |
2367 | /* NOTE: all executable code must be the first section | |
2368 | * in this array; otherwise modify the text_size | |
2369 | * finder in the two loops below */ | |
2370 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2371 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
444d13ff | 2372 | { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
1da177e4 LT |
2373 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
2374 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2375 | }; | |
2376 | unsigned int m, i; | |
2377 | ||
49668688 RR |
2378 | for (i = 0; i < info->hdr->e_shnum; i++) |
2379 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2380 | |
5e124169 | 2381 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2382 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2383 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2384 | Elf_Shdr *s = &info->sechdrs[i]; | |
2385 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2386 | |
2387 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2388 | || (s->sh_flags & masks[m][1]) | |
2389 | || s->sh_entsize != ~0UL | |
49668688 | 2390 | || strstarts(sname, ".init")) |
1da177e4 | 2391 | continue; |
7523e4dc | 2392 | s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e124169 | 2393 | pr_debug("\t%s\n", sname); |
1da177e4 | 2394 | } |
84e1c6bb | 2395 | switch (m) { |
2396 | case 0: /* executable */ | |
7523e4dc RR |
2397 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2398 | mod->core_layout.text_size = mod->core_layout.size; | |
84e1c6bb | 2399 | break; |
2400 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2401 | mod->core_layout.size = debug_align(mod->core_layout.size); |
2402 | mod->core_layout.ro_size = mod->core_layout.size; | |
84e1c6bb | 2403 | break; |
444d13ff JY |
2404 | case 2: /* RO after init */ |
2405 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
2406 | mod->core_layout.ro_after_init_size = mod->core_layout.size; | |
2407 | break; | |
2408 | case 4: /* whole core */ | |
7523e4dc | 2409 | mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb | 2410 | break; |
2411 | } | |
1da177e4 LT |
2412 | } |
2413 | ||
5e124169 | 2414 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2415 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2416 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2417 | Elf_Shdr *s = &info->sechdrs[i]; | |
2418 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2419 | |
2420 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2421 | || (s->sh_flags & masks[m][1]) | |
2422 | || s->sh_entsize != ~0UL | |
49668688 | 2423 | || !strstarts(sname, ".init")) |
1da177e4 | 2424 | continue; |
7523e4dc | 2425 | s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4 | 2426 | | INIT_OFFSET_MASK); |
5e124169 | 2427 | pr_debug("\t%s\n", sname); |
1da177e4 | 2428 | } |
84e1c6bb | 2429 | switch (m) { |
2430 | case 0: /* executable */ | |
7523e4dc RR |
2431 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2432 | mod->init_layout.text_size = mod->init_layout.size; | |
84e1c6bb | 2433 | break; |
2434 | case 1: /* RO: text and ro-data */ | |
7523e4dc RR |
2435 | mod->init_layout.size = debug_align(mod->init_layout.size); |
2436 | mod->init_layout.ro_size = mod->init_layout.size; | |
84e1c6bb | 2437 | break; |
444d13ff JY |
2438 | case 2: |
2439 | /* | |
2440 | * RO after init doesn't apply to init_layout (only | |
2441 | * core_layout), so it just takes the value of ro_size. | |
2442 | */ | |
2443 | mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; | |
2444 | break; | |
2445 | case 4: /* whole init */ | |
7523e4dc | 2446 | mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb | 2447 | break; |
2448 | } | |
1da177e4 LT |
2449 | } |
2450 | } | |
2451 | ||
1da177e4 LT |
2452 | static void set_license(struct module *mod, const char *license) |
2453 | { | |
2454 | if (!license) | |
2455 | license = "unspecified"; | |
2456 | ||
fa3ba2e8 | 2457 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2458 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b3 AM |
2459 | pr_warn("%s: module license '%s' taints kernel.\n", |
2460 | mod->name, license); | |
373d4d09 RR |
2461 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
2462 | LOCKDEP_NOW_UNRELIABLE); | |
1da177e4 LT |
2463 | } |
2464 | } | |
2465 | ||
2466 | /* Parse tag=value strings from .modinfo section */ | |
2467 | static char *next_string(char *string, unsigned long *secsize) | |
2468 | { | |
2469 | /* Skip non-zero chars */ | |
2470 | while (string[0]) { | |
2471 | string++; | |
2472 | if ((*secsize)-- <= 1) | |
2473 | return NULL; | |
2474 | } | |
2475 | ||
2476 | /* Skip any zero padding. */ | |
2477 | while (!string[0]) { | |
2478 | string++; | |
2479 | if ((*secsize)-- <= 1) | |
2480 | return NULL; | |
2481 | } | |
2482 | return string; | |
2483 | } | |
2484 | ||
49668688 | 2485 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2486 | { |
2487 | char *p; | |
2488 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2489 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2490 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2491 | |
49668688 | 2492 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2493 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2494 | return p + taglen + 1; | |
2495 | } | |
2496 | return NULL; | |
2497 | } | |
2498 | ||
49668688 | 2499 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2500 | { |
2501 | struct module_attribute *attr; | |
2502 | int i; | |
2503 | ||
2504 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2505 | if (attr->setup) | |
49668688 | 2506 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2507 | } |
2508 | } | |
c988d2b2 | 2509 | |
a263f776 RR |
2510 | static void free_modinfo(struct module *mod) |
2511 | { | |
2512 | struct module_attribute *attr; | |
2513 | int i; | |
2514 | ||
2515 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2516 | if (attr->free) | |
2517 | attr->free(mod); | |
2518 | } | |
2519 | } | |
2520 | ||
1da177e4 | 2521 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2522 | |
2523 | /* lookup symbol in given range of kernel_symbols */ | |
2524 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2525 | const struct kernel_symbol *start, | |
2526 | const struct kernel_symbol *stop) | |
2527 | { | |
9d63487f AIB |
2528 | return bsearch(name, start, stop - start, |
2529 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2530 | } |
2531 | ||
ca4787b7 TA |
2532 | static int is_exported(const char *name, unsigned long value, |
2533 | const struct module *mod) | |
1da177e4 | 2534 | { |
ca4787b7 TA |
2535 | const struct kernel_symbol *ks; |
2536 | if (!mod) | |
2537 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2538 | else |
ca4787b7 TA |
2539 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2540 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2541 | } |
2542 | ||
2543 | /* As per nm */ | |
eded41c1 | 2544 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2545 | { |
eded41c1 RR |
2546 | const Elf_Shdr *sechdrs = info->sechdrs; |
2547 | ||
1da177e4 LT |
2548 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2549 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2550 | return 'v'; | |
2551 | else | |
2552 | return 'w'; | |
2553 | } | |
2554 | if (sym->st_shndx == SHN_UNDEF) | |
2555 | return 'U'; | |
e0224418 | 2556 | if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4 LT |
2557 | return 'a'; |
2558 | if (sym->st_shndx >= SHN_LORESERVE) | |
2559 | return '?'; | |
2560 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2561 | return 't'; | |
2562 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2563 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2564 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2565 | return 'r'; | |
2566 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2567 | return 'g'; | |
2568 | else | |
2569 | return 'd'; | |
2570 | } | |
2571 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2572 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2573 | return 's'; | |
2574 | else | |
2575 | return 'b'; | |
2576 | } | |
eded41c1 RR |
2577 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2578 | ".debug")) { | |
1da177e4 | 2579 | return 'n'; |
eded41c1 | 2580 | } |
1da177e4 LT |
2581 | return '?'; |
2582 | } | |
2583 | ||
4a496226 | 2584 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e0224418 | 2585 | unsigned int shnum, unsigned int pcpundx) |
4a496226 JB |
2586 | { |
2587 | const Elf_Shdr *sec; | |
2588 | ||
2589 | if (src->st_shndx == SHN_UNDEF | |
2590 | || src->st_shndx >= shnum | |
2591 | || !src->st_name) | |
2592 | return false; | |
2593 | ||
e0224418 MB |
2594 | #ifdef CONFIG_KALLSYMS_ALL |
2595 | if (src->st_shndx == pcpundx) | |
2596 | return true; | |
2597 | #endif | |
2598 | ||
4a496226 JB |
2599 | sec = sechdrs + src->st_shndx; |
2600 | if (!(sec->sh_flags & SHF_ALLOC) | |
2601 | #ifndef CONFIG_KALLSYMS_ALL | |
2602 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2603 | #endif | |
2604 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2605 | return false; | |
2606 | ||
2607 | return true; | |
2608 | } | |
2609 | ||
48fd1188 KC |
2610 | /* |
2611 | * We only allocate and copy the strings needed by the parts of symtab | |
2612 | * we keep. This is simple, but has the effect of making multiple | |
2613 | * copies of duplicates. We could be more sophisticated, see | |
2614 | * linux-kernel thread starting with | |
2615 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2616 | */ | |
49668688 | 2617 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2618 | { |
49668688 RR |
2619 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2620 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2621 | const Elf_Sym *src; |
54523ec7 | 2622 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2623 | |
2624 | /* Put symbol section at end of init part of module. */ | |
2625 | symsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2626 | symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688 | 2627 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2628 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2629 | |
49668688 | 2630 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2631 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2632 | |
48fd1188 | 2633 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 | 2634 | for (ndst = i = 0; i < nsrc; i++) { |
1ce15ef4 | 2635 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2636 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2637 | info->index.pcpu)) { | |
59ef28b1 | 2638 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd1188 | 2639 | ndst++; |
554bdfe5 | 2640 | } |
59ef28b1 | 2641 | } |
4a496226 JB |
2642 | |
2643 | /* Append room for core symbols at end of core part. */ | |
7523e4dc RR |
2644 | info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
2645 | info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); | |
2646 | mod->core_layout.size += strtab_size; | |
2647 | mod->core_layout.size = debug_align(mod->core_layout.size); | |
4a496226 | 2648 | |
554bdfe5 JB |
2649 | /* Put string table section at end of init part of module. */ |
2650 | strsect->sh_flags |= SHF_ALLOC; | |
7523e4dc | 2651 | strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688 | 2652 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2653 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
8244062e RR |
2654 | |
2655 | /* We'll tack temporary mod_kallsyms on the end. */ | |
2656 | mod->init_layout.size = ALIGN(mod->init_layout.size, | |
2657 | __alignof__(struct mod_kallsyms)); | |
2658 | info->mod_kallsyms_init_off = mod->init_layout.size; | |
2659 | mod->init_layout.size += sizeof(struct mod_kallsyms); | |
2660 | mod->init_layout.size = debug_align(mod->init_layout.size); | |
4a496226 JB |
2661 | } |
2662 | ||
8244062e RR |
2663 | /* |
2664 | * We use the full symtab and strtab which layout_symtab arranged to | |
2665 | * be appended to the init section. Later we switch to the cut-down | |
2666 | * core-only ones. | |
2667 | */ | |
811d66a0 | 2668 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2669 | { |
4a496226 JB |
2670 | unsigned int i, ndst; |
2671 | const Elf_Sym *src; | |
2672 | Elf_Sym *dst; | |
554bdfe5 | 2673 | char *s; |
eded41c1 | 2674 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2675 | |
8244062e RR |
2676 | /* Set up to point into init section. */ |
2677 | mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; | |
2678 | ||
2679 | mod->kallsyms->symtab = (void *)symsec->sh_addr; | |
2680 | mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae | 2681 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
8244062e | 2682 | mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1da177e4 LT |
2683 | |
2684 | /* Set types up while we still have access to sections. */ | |
8244062e RR |
2685 | for (i = 0; i < mod->kallsyms->num_symtab; i++) |
2686 | mod->kallsyms->symtab[i].st_info | |
2687 | = elf_type(&mod->kallsyms->symtab[i], info); | |
2688 | ||
2689 | /* Now populate the cut down core kallsyms for after init. */ | |
2690 | mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; | |
2691 | mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; | |
2692 | src = mod->kallsyms->symtab; | |
2693 | for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { | |
1ce15ef4 | 2694 | if (i == 0 || is_livepatch_module(mod) || |
e0224418 MB |
2695 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
2696 | info->index.pcpu)) { | |
59ef28b1 | 2697 | dst[ndst] = src[i]; |
8244062e RR |
2698 | dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
2699 | s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], | |
59ef28b1 RR |
2700 | KSYM_NAME_LEN) + 1; |
2701 | } | |
4a496226 | 2702 | } |
8244062e | 2703 | mod->core_kallsyms.num_symtab = ndst; |
1da177e4 LT |
2704 | } |
2705 | #else | |
49668688 | 2706 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2707 | { |
2708 | } | |
3ae91c21 | 2709 | |
abbce906 | 2710 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2711 | { |
2712 | } | |
2713 | #endif /* CONFIG_KALLSYMS */ | |
2714 | ||
e9d376f0 | 2715 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2716 | { |
811d66a0 RR |
2717 | if (!debug) |
2718 | return; | |
e9d376f0 JB |
2719 | #ifdef CONFIG_DYNAMIC_DEBUG |
2720 | if (ddebug_add_module(debug, num, debug->modname)) | |
bddb12b3 AM |
2721 | pr_err("dynamic debug error adding module: %s\n", |
2722 | debug->modname); | |
e9d376f0 | 2723 | #endif |
5e458cc0 | 2724 | } |
346e15be | 2725 | |
ff49d74a YS |
2726 | static void dynamic_debug_remove(struct _ddebug *debug) |
2727 | { | |
2728 | if (debug) | |
2729 | ddebug_remove_module(debug->modname); | |
2730 | } | |
2731 | ||
74e08fcf JB |
2732 | void * __weak module_alloc(unsigned long size) |
2733 | { | |
82fab442 | 2734 | return vmalloc_exec(size); |
74e08fcf JB |
2735 | } |
2736 | ||
4f2294b6 | 2737 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2738 | static void kmemleak_load_module(const struct module *mod, |
2739 | const struct load_info *info) | |
4f2294b6 CM |
2740 | { |
2741 | unsigned int i; | |
2742 | ||
2743 | /* only scan the sections containing data */ | |
c017b4be | 2744 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2745 | |
49668688 | 2746 | for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c SR |
2747 | /* Scan all writable sections that's not executable */ |
2748 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || | |
2749 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || | |
2750 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) | |
4f2294b6 CM |
2751 | continue; |
2752 | ||
49668688 RR |
2753 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2754 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2755 | } |
2756 | } | |
2757 | #else | |
49668688 RR |
2758 | static inline void kmemleak_load_module(const struct module *mod, |
2759 | const struct load_info *info) | |
4f2294b6 CM |
2760 | { |
2761 | } | |
2762 | #endif | |
2763 | ||
106a4ee2 | 2764 | #ifdef CONFIG_MODULE_SIG |
bca014ca | 2765 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2766 | { |
2767 | int err = -ENOKEY; | |
34e1169d KC |
2768 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2769 | const void *mod = info->hdr; | |
caabe240 | 2770 | |
bca014ca BH |
2771 | /* |
2772 | * Require flags == 0, as a module with version information | |
2773 | * removed is no longer the module that was signed | |
2774 | */ | |
2775 | if (flags == 0 && | |
2776 | info->len > markerlen && | |
34e1169d | 2777 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe240 | 2778 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2779 | info->len -= markerlen; |
2780 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2781 | } |
2782 | ||
2783 | if (!err) { | |
2784 | info->sig_ok = true; | |
2785 | return 0; | |
2786 | } | |
2787 | ||
2788 | /* Not having a signature is only an error if we're strict. */ | |
2789 | if (err == -ENOKEY && !sig_enforce) | |
2790 | err = 0; | |
2791 | ||
2792 | return err; | |
2793 | } | |
2794 | #else /* !CONFIG_MODULE_SIG */ | |
bca014ca | 2795 | static int module_sig_check(struct load_info *info, int flags) |
106a4ee2 RR |
2796 | { |
2797 | return 0; | |
2798 | } | |
2799 | #endif /* !CONFIG_MODULE_SIG */ | |
2800 | ||
34e1169d KC |
2801 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2802 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2803 | { |
34e1169d KC |
2804 | if (info->len < sizeof(*(info->hdr))) |
2805 | return -ENOEXEC; | |
2806 | ||
2807 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2808 | || info->hdr->e_type != ET_REL | |
2809 | || !elf_check_arch(info->hdr) | |
2810 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2811 | return -ENOEXEC; | |
2812 | ||
2813 | if (info->hdr->e_shoff >= info->len | |
2814 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2815 | info->len - info->hdr->e_shoff)) | |
2816 | return -ENOEXEC; | |
40dd2560 | 2817 | |
34e1169d KC |
2818 | return 0; |
2819 | } | |
2820 | ||
3afe9f84 LT |
2821 | #define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
2822 | ||
2823 | static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) | |
2824 | { | |
2825 | do { | |
2826 | unsigned long n = min(len, COPY_CHUNK_SIZE); | |
2827 | ||
2828 | if (copy_from_user(dst, usrc, n) != 0) | |
2829 | return -EFAULT; | |
2830 | cond_resched(); | |
2831 | dst += n; | |
2832 | usrc += n; | |
2833 | len -= n; | |
2834 | } while (len); | |
2835 | return 0; | |
2836 | } | |
2837 | ||
1ce15ef4 | 2838 | #ifdef CONFIG_LIVEPATCH |
2992ef29 | 2839 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 | 2840 | { |
2992ef29 JP |
2841 | if (get_modinfo(info, "livepatch")) { |
2842 | mod->klp = true; | |
2843 | add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); | |
7598d167 JL |
2844 | pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
2845 | mod->name); | |
2992ef29 | 2846 | } |
1ce15ef4 JY |
2847 | |
2848 | return 0; | |
2849 | } | |
2850 | #else /* !CONFIG_LIVEPATCH */ | |
2992ef29 | 2851 | static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
1ce15ef4 JY |
2852 | { |
2853 | if (get_modinfo(info, "livepatch")) { | |
2854 | pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", | |
2855 | mod->name); | |
2856 | return -ENOEXEC; | |
2857 | } | |
2858 | ||
2859 | return 0; | |
2860 | } | |
2861 | #endif /* CONFIG_LIVEPATCH */ | |
2862 | ||
34e1169d KC |
2863 | /* Sets info->hdr and info->len. */ |
2864 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2865 | struct load_info *info) | |
40dd2560 RR |
2866 | { |
2867 | int err; | |
40dd2560 | 2868 | |
34e1169d KC |
2869 | info->len = len; |
2870 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2871 | return -ENOEXEC; |
2872 | ||
a1db7420 | 2873 | err = security_kernel_read_file(NULL, READING_MODULE); |
2e72d51b KC |
2874 | if (err) |
2875 | return err; | |
2876 | ||
40dd2560 | 2877 | /* Suck in entire file: we'll want most of it. */ |
cc9e605d | 2878 | info->hdr = __vmalloc(info->len, |
19809c2d | 2879 | GFP_KERNEL | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d | 2880 | if (!info->hdr) |
40dd2560 RR |
2881 | return -ENOMEM; |
2882 | ||
3afe9f84 | 2883 | if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d KC |
2884 | vfree(info->hdr); |
2885 | return -EFAULT; | |
40dd2560 RR |
2886 | } |
2887 | ||
34e1169d KC |
2888 | return 0; |
2889 | } | |
2890 | ||
d913188c RR |
2891 | static void free_copy(struct load_info *info) |
2892 | { | |
d913188c RR |
2893 | vfree(info->hdr); |
2894 | } | |
2895 | ||
2f3238ae | 2896 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2897 | { |
2898 | unsigned int i; | |
2899 | ||
2900 | /* This should always be true, but let's be sure. */ | |
2901 | info->sechdrs[0].sh_addr = 0; | |
2902 | ||
2903 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2904 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2905 | if (shdr->sh_type != SHT_NOBITS | |
2906 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
bddb12b3 | 2907 | pr_err("Module len %lu truncated\n", info->len); |
8b5f61a7 RR |
2908 | return -ENOEXEC; |
2909 | } | |
2910 | ||
2911 | /* Mark all sections sh_addr with their address in the | |
2912 | temporary image. */ | |
2913 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2914 | ||
2915 | #ifndef CONFIG_MODULE_UNLOAD | |
2916 | /* Don't load .exit sections */ | |
2917 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2918 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2919 | #endif | |
8b5f61a7 | 2920 | } |
d6df72a0 RR |
2921 | |
2922 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2923 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2924 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2925 | else | |
2926 | info->index.vers = find_sec(info, "__versions"); | |
3e2e857f KC |
2927 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2928 | ||
49668688 | 2929 | info->index.info = find_sec(info, ".modinfo"); |
3e2e857f KC |
2930 | if (!info->index.info) |
2931 | info->name = "(missing .modinfo section)"; | |
2932 | else | |
2933 | info->name = get_modinfo(info, "name"); | |
d6df72a0 | 2934 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
3e2e857f | 2935 | |
8b5f61a7 RR |
2936 | return 0; |
2937 | } | |
2938 | ||
3264d3f9 LT |
2939 | /* |
2940 | * Set up our basic convenience variables (pointers to section headers, | |
2941 | * search for module section index etc), and do some basic section | |
2942 | * verification. | |
2943 | * | |
2944 | * Return the temporary module pointer (we'll replace it with the final | |
2945 | * one when we move the module sections around). | |
2946 | */ | |
2f3238ae | 2947 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2948 | { |
2949 | unsigned int i; | |
8b5f61a7 | 2950 | int err; |
3264d3f9 LT |
2951 | struct module *mod; |
2952 | ||
2953 | /* Set up the convenience variables */ | |
2954 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2955 | info->secstrings = (void *)info->hdr |
2956 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2957 | |
2f3238ae | 2958 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2959 | if (err) |
2960 | return ERR_PTR(err); | |
3264d3f9 | 2961 | |
8b5f61a7 RR |
2962 | /* Find internal symbols and strings. */ |
2963 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2964 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2965 | info->index.sym = i; | |
2966 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2967 | info->strtab = (char *)info->hdr |
2968 | + info->sechdrs[info->index.str].sh_offset; | |
2969 | break; | |
3264d3f9 | 2970 | } |
3264d3f9 LT |
2971 | } |
2972 | ||
49668688 | 2973 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 | 2974 | if (!info->index.mod) { |
3e2e857f KC |
2975 | pr_warn("%s: No module found in object\n", |
2976 | info->name ?: "(missing .modinfo name field)"); | |
3264d3f9 LT |
2977 | return ERR_PTR(-ENOEXEC); |
2978 | } | |
2979 | /* This is temporary: point mod into copy of data. */ | |
2980 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2981 | ||
3e2e857f KC |
2982 | /* |
2983 | * If we didn't load the .modinfo 'name' field, fall back to | |
2984 | * on-disk struct mod 'name' field. | |
2985 | */ | |
2986 | if (!info->name) | |
2987 | info->name = mod->name; | |
2988 | ||
3264d3f9 | 2989 | if (info->index.sym == 0) { |
3e2e857f | 2990 | pr_warn("%s: module has no symbols (stripped?)\n", info->name); |
3264d3f9 LT |
2991 | return ERR_PTR(-ENOEXEC); |
2992 | } | |
2993 | ||
49668688 | 2994 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2995 | |
3264d3f9 | 2996 | /* Check module struct version now, before we try to use module. */ |
49019426 | 2997 | if (!check_modstruct_version(info, mod)) |
3264d3f9 LT |
2998 | return ERR_PTR(-ENOEXEC); |
2999 | ||
3000 | return mod; | |
3264d3f9 LT |
3001 | } |
3002 | ||
2f3238ae | 3003 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 3004 | { |
49668688 | 3005 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
3006 | int err; |
3007 | ||
2f3238ae RR |
3008 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
3009 | modmagic = NULL; | |
3010 | ||
40dd2560 RR |
3011 | /* This is allowed: modprobe --force will invalidate it. */ |
3012 | if (!modmagic) { | |
3013 | err = try_to_force_load(mod, "bad vermagic"); | |
3014 | if (err) | |
3015 | return err; | |
49668688 | 3016 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b3 | 3017 | pr_err("%s: version magic '%s' should be '%s'\n", |
3e2e857f | 3018 | info->name, modmagic, vermagic); |
40dd2560 RR |
3019 | return -ENOEXEC; |
3020 | } | |
3021 | ||
3205c36c LP |
3022 | if (!get_modinfo(info, "intree")) { |
3023 | if (!test_taint(TAINT_OOT_MODULE)) | |
3024 | pr_warn("%s: loading out-of-tree module taints kernel.\n", | |
3025 | mod->name); | |
373d4d09 | 3026 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
3205c36c | 3027 | } |
2449b8ba | 3028 | |
49668688 | 3029 | if (get_modinfo(info, "staging")) { |
373d4d09 | 3030 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b3 AM |
3031 | pr_warn("%s: module is from the staging directory, the quality " |
3032 | "is unknown, you have been warned.\n", mod->name); | |
40dd2560 | 3033 | } |
22e268eb | 3034 | |
2992ef29 | 3035 | err = check_modinfo_livepatch(mod, info); |
1ce15ef4 JY |
3036 | if (err) |
3037 | return err; | |
3038 | ||
22e268eb | 3039 | /* Set up license info based on the info section */ |
49668688 | 3040 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 3041 | |
40dd2560 RR |
3042 | return 0; |
3043 | } | |
3044 | ||
eb3057df | 3045 | static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 3046 | { |
49668688 | 3047 | mod->kp = section_objs(info, "__param", |
f91a13bb | 3048 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 3049 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 3050 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
3051 | mod->crcs = section_addr(info, "__kcrctab"); |
3052 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
3053 | sizeof(*mod->gpl_syms), |
3054 | &mod->num_gpl_syms); | |
49668688 RR |
3055 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
3056 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
3057 | "__ksymtab_gpl_future", |
3058 | sizeof(*mod->gpl_future_syms), | |
3059 | &mod->num_gpl_future_syms); | |
49668688 | 3060 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
3061 | |
3062 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 3063 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
3064 | sizeof(*mod->unused_syms), |
3065 | &mod->num_unused_syms); | |
49668688 RR |
3066 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
3067 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
3068 | sizeof(*mod->unused_gpl_syms), |
3069 | &mod->num_unused_gpl_syms); | |
49668688 | 3070 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
3071 | #endif |
3072 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 3073 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb | 3074 | sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df FH |
3075 | if (!mod->ctors) |
3076 | mod->ctors = section_objs(info, ".init_array", | |
3077 | sizeof(*mod->ctors), &mod->num_ctors); | |
3078 | else if (find_sec(info, ".init_array")) { | |
3079 | /* | |
3080 | * This shouldn't happen with same compiler and binutils | |
3081 | * building all parts of the module. | |
3082 | */ | |
6da0b565 | 3083 | pr_warn("%s: has both .ctors and .init_array.\n", |
eb3057df FH |
3084 | mod->name); |
3085 | return -EINVAL; | |
3086 | } | |
f91a13bb LT |
3087 | #endif |
3088 | ||
3089 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
3090 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
3091 | sizeof(*mod->tracepoints_ptrs), | |
3092 | &mod->num_tracepoints); | |
f91a13bb | 3093 | #endif |
bf5438fc JB |
3094 | #ifdef HAVE_JUMP_LABEL |
3095 | mod->jump_entries = section_objs(info, "__jump_table", | |
3096 | sizeof(*mod->jump_entries), | |
3097 | &mod->num_jump_entries); | |
3098 | #endif | |
f91a13bb | 3099 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 3100 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
3101 | sizeof(*mod->trace_events), |
3102 | &mod->num_trace_events); | |
3673b8e4 SRRH |
3103 | mod->trace_enums = section_objs(info, "_ftrace_enum_map", |
3104 | sizeof(*mod->trace_enums), | |
3105 | &mod->num_trace_enums); | |
f91a13bb | 3106 | #endif |
13b9b6e7 SR |
3107 | #ifdef CONFIG_TRACING |
3108 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
3109 | sizeof(*mod->trace_bprintk_fmt_start), | |
3110 | &mod->num_trace_bprintk_fmt); | |
13b9b6e7 | 3111 | #endif |
f91a13bb LT |
3112 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
3113 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 3114 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
3115 | sizeof(*mod->ftrace_callsites), |
3116 | &mod->num_ftrace_callsites); | |
3117 | #endif | |
22e268eb | 3118 | |
811d66a0 RR |
3119 | mod->extable = section_objs(info, "__ex_table", |
3120 | sizeof(*mod->extable), &mod->num_exentries); | |
3121 | ||
49668688 | 3122 | if (section_addr(info, "__obsparm")) |
bddb12b3 | 3123 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
811d66a0 RR |
3124 | |
3125 | info->debug = section_objs(info, "__verbose", | |
3126 | sizeof(*info->debug), &info->num_debug); | |
eb3057df FH |
3127 | |
3128 | return 0; | |
f91a13bb LT |
3129 | } |
3130 | ||
49668688 | 3131 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
3132 | { |
3133 | int i; | |
3134 | void *ptr; | |
3135 | ||
3136 | /* Do the allocs. */ | |
7523e4dc | 3137 | ptr = module_alloc(mod->core_layout.size); |
65b8a9b4 LT |
3138 | /* |
3139 | * The pointer to this block is stored in the module structure | |
3140 | * which is inside the block. Just mark it as not being a | |
3141 | * leak. | |
3142 | */ | |
3143 | kmemleak_not_leak(ptr); | |
3144 | if (!ptr) | |
d913188c | 3145 | return -ENOMEM; |
65b8a9b4 | 3146 | |
7523e4dc RR |
3147 | memset(ptr, 0, mod->core_layout.size); |
3148 | mod->core_layout.base = ptr; | |
65b8a9b4 | 3149 | |
7523e4dc RR |
3150 | if (mod->init_layout.size) { |
3151 | ptr = module_alloc(mod->init_layout.size); | |
82fab442 RR |
3152 | /* |
3153 | * The pointer to this block is stored in the module structure | |
3154 | * which is inside the block. This block doesn't need to be | |
3155 | * scanned as it contains data and code that will be freed | |
3156 | * after the module is initialized. | |
3157 | */ | |
3158 | kmemleak_ignore(ptr); | |
3159 | if (!ptr) { | |
7523e4dc | 3160 | module_memfree(mod->core_layout.base); |
82fab442 RR |
3161 | return -ENOMEM; |
3162 | } | |
7523e4dc RR |
3163 | memset(ptr, 0, mod->init_layout.size); |
3164 | mod->init_layout.base = ptr; | |
82fab442 | 3165 | } else |
7523e4dc | 3166 | mod->init_layout.base = NULL; |
65b8a9b4 LT |
3167 | |
3168 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 3169 | pr_debug("final section addresses:\n"); |
49668688 | 3170 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 3171 | void *dest; |
49668688 | 3172 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 3173 | |
49668688 | 3174 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
3175 | continue; |
3176 | ||
49668688 | 3177 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc | 3178 | dest = mod->init_layout.base |
49668688 | 3179 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 3180 | else |
7523e4dc | 3181 | dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4 | 3182 | |
49668688 RR |
3183 | if (shdr->sh_type != SHT_NOBITS) |
3184 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 3185 | /* Update sh_addr to point to copy in image. */ |
49668688 | 3186 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
3187 | pr_debug("\t0x%lx %s\n", |
3188 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 3189 | } |
d913188c RR |
3190 | |
3191 | return 0; | |
65b8a9b4 LT |
3192 | } |
3193 | ||
49668688 | 3194 | static int check_module_license_and_versions(struct module *mod) |
22e268eb | 3195 | { |
3205c36c LP |
3196 | int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
3197 | ||
22e268eb RR |
3198 | /* |
3199 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
3200 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
3201 | * using GPL-only symbols it needs. | |
3202 | */ | |
3203 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
373d4d09 | 3204 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268eb RR |
3205 | |
3206 | /* driverloader was caught wrongly pretending to be under GPL */ | |
3207 | if (strcmp(mod->name, "driverloader") == 0) | |
373d4d09 RR |
3208 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3209 | LOCKDEP_NOW_UNRELIABLE); | |
22e268eb | 3210 | |
c99af375 MG |
3211 | /* lve claims to be GPL but upstream won't provide source */ |
3212 | if (strcmp(mod->name, "lve") == 0) | |
373d4d09 RR |
3213 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
3214 | LOCKDEP_NOW_UNRELIABLE); | |
c99af375 | 3215 | |
3205c36c LP |
3216 | if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
3217 | pr_warn("%s: module license taints kernel.\n", mod->name); | |
3218 | ||
22e268eb RR |
3219 | #ifdef CONFIG_MODVERSIONS |
3220 | if ((mod->num_syms && !mod->crcs) | |
3221 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
3222 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
3223 | #ifdef CONFIG_UNUSED_SYMBOLS | |
3224 | || (mod->num_unused_syms && !mod->unused_crcs) | |
3225 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
3226 | #endif | |
3227 | ) { | |
3228 | return try_to_force_load(mod, | |
3229 | "no versions for exported symbols"); | |
3230 | } | |
3231 | #endif | |
3232 | return 0; | |
3233 | } | |
3234 | ||
3235 | static void flush_module_icache(const struct module *mod) | |
3236 | { | |
3237 | mm_segment_t old_fs; | |
3238 | ||
3239 | /* flush the icache in correct context */ | |
3240 | old_fs = get_fs(); | |
3241 | set_fs(KERNEL_DS); | |
3242 | ||
3243 | /* | |
3244 | * Flush the instruction cache, since we've played with text. | |
3245 | * Do it before processing of module parameters, so the module | |
3246 | * can provide parameter accessor functions of its own. | |
3247 | */ | |
7523e4dc RR |
3248 | if (mod->init_layout.base) |
3249 | flush_icache_range((unsigned long)mod->init_layout.base, | |
3250 | (unsigned long)mod->init_layout.base | |
3251 | + mod->init_layout.size); | |
3252 | flush_icache_range((unsigned long)mod->core_layout.base, | |
3253 | (unsigned long)mod->core_layout.base + mod->core_layout.size); | |
22e268eb RR |
3254 | |
3255 | set_fs(old_fs); | |
3256 | } | |
3257 | ||
74e08fcf JB |
3258 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
3259 | Elf_Shdr *sechdrs, | |
3260 | char *secstrings, | |
3261 | struct module *mod) | |
3262 | { | |
3263 | return 0; | |
3264 | } | |
3265 | ||
be7de5f9 PB |
3266 | /* module_blacklist is a comma-separated list of module names */ |
3267 | static char *module_blacklist; | |
3268 | static bool blacklisted(char *module_name) | |
3269 | { | |
3270 | const char *p; | |
3271 | size_t len; | |
3272 | ||
3273 | if (!module_blacklist) | |
3274 | return false; | |
3275 | ||
3276 | for (p = module_blacklist; *p; p += len) { | |
3277 | len = strcspn(p, ","); | |
3278 | if (strlen(module_name) == len && !memcmp(module_name, p, len)) | |
3279 | return true; | |
3280 | if (p[len] == ',') | |
3281 | len++; | |
3282 | } | |
3283 | return false; | |
3284 | } | |
3285 | core_param(module_blacklist, module_blacklist, charp, 0400); | |
3286 | ||
2f3238ae | 3287 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 3288 | { |
d913188c | 3289 | /* Module within temporary copy. */ |
1da177e4 | 3290 | struct module *mod; |
444d13ff | 3291 | unsigned int ndx; |
d913188c | 3292 | int err; |
3ae91c21 | 3293 | |
2f3238ae | 3294 | mod = setup_load_info(info, flags); |
d913188c RR |
3295 | if (IS_ERR(mod)) |
3296 | return mod; | |
1da177e4 | 3297 | |
3e2e857f | 3298 | if (blacklisted(info->name)) |
be7de5f9 PB |
3299 | return ERR_PTR(-EPERM); |
3300 | ||
2f3238ae | 3301 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
3302 | if (err) |
3303 | return ERR_PTR(err); | |
1da177e4 | 3304 | |
1da177e4 | 3305 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
3306 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
3307 | info->secstrings, mod); | |
1da177e4 | 3308 | if (err < 0) |
8d8022e8 | 3309 | return ERR_PTR(err); |
1da177e4 | 3310 | |
8d8022e8 RR |
3311 | /* We will do a special allocation for per-cpu sections later. */ |
3312 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
1da177e4 | 3313 | |
444d13ff JY |
3314 | /* |
3315 | * Mark ro_after_init section with SHF_RO_AFTER_INIT so that | |
3316 | * layout_sections() can put it in the right place. | |
3317 | * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. | |
3318 | */ | |
3319 | ndx = find_sec(info, ".data..ro_after_init"); | |
3320 | if (ndx) | |
3321 | info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; | |
3322 | ||
1da177e4 LT |
3323 | /* Determine total sizes, and put offsets in sh_entsize. For now |
3324 | this is done generically; there doesn't appear to be any | |
3325 | special cases for the architectures. */ | |
49668688 | 3326 | layout_sections(mod, info); |
49668688 | 3327 | layout_symtab(mod, info); |
1da177e4 | 3328 | |
65b8a9b4 | 3329 | /* Allocate and move to the final place */ |
49668688 | 3330 | err = move_module(mod, info); |
d913188c | 3331 | if (err) |
8d8022e8 | 3332 | return ERR_PTR(err); |
d913188c RR |
3333 | |
3334 | /* Module has been copied to its final place now: return it. */ | |
3335 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 3336 | kmemleak_load_module(mod, info); |
d913188c | 3337 | return mod; |
d913188c RR |
3338 | } |
3339 | ||
3340 | /* mod is no longer valid after this! */ | |
3341 | static void module_deallocate(struct module *mod, struct load_info *info) | |
3342 | { | |
d913188c | 3343 | percpu_modfree(mod); |
d453cded | 3344 | module_arch_freeing_init(mod); |
7523e4dc RR |
3345 | module_memfree(mod->init_layout.base); |
3346 | module_memfree(mod->core_layout.base); | |
d913188c RR |
3347 | } |
3348 | ||
74e08fcf JB |
3349 | int __weak module_finalize(const Elf_Ehdr *hdr, |
3350 | const Elf_Shdr *sechdrs, | |
3351 | struct module *me) | |
3352 | { | |
3353 | return 0; | |
3354 | } | |
3355 | ||
811d66a0 RR |
3356 | static int post_relocation(struct module *mod, const struct load_info *info) |
3357 | { | |
51f3d0f4 | 3358 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3359 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3360 | ||
3361 | /* Copy relocated percpu area over. */ | |
3362 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3363 | info->sechdrs[info->index.pcpu].sh_size); | |
3364 | ||
51f3d0f4 | 3365 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3366 | add_kallsyms(mod, info); |
3367 | ||
3368 | /* Arch-specific module finalizing. */ | |
3369 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3370 | } | |
3371 | ||
9bb9c3be RR |
3372 | /* Is this module of this name done loading? No locks held. */ |
3373 | static bool finished_loading(const char *name) | |
3374 | { | |
3375 | struct module *mod; | |
3376 | bool ret; | |
3377 | ||
9cc019b8 PZ |
3378 | /* |
3379 | * The module_mutex should not be a heavily contended lock; | |
3380 | * if we get the occasional sleep here, we'll go an extra iteration | |
3381 | * in the wait_event_interruptible(), which is harmless. | |
3382 | */ | |
3383 | sched_annotate_sleep(); | |
9bb9c3be | 3384 | mutex_lock(&module_mutex); |
4f6de4d5 | 3385 | mod = find_module_all(name, strlen(name), true); |
0d21b0e3 RR |
3386 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3387 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3388 | mutex_unlock(&module_mutex); |
3389 | ||
3390 | return ret; | |
3391 | } | |
3392 | ||
34e1169d KC |
3393 | /* Call module constructors. */ |
3394 | static void do_mod_ctors(struct module *mod) | |
3395 | { | |
3396 | #ifdef CONFIG_CONSTRUCTORS | |
3397 | unsigned long i; | |
3398 | ||
3399 | for (i = 0; i < mod->num_ctors; i++) | |
3400 | mod->ctors[i](); | |
3401 | #endif | |
3402 | } | |
3403 | ||
c7496379 RR |
3404 | /* For freeing module_init on success, in case kallsyms traversing */ |
3405 | struct mod_initfree { | |
3406 | struct rcu_head rcu; | |
3407 | void *module_init; | |
3408 | }; | |
3409 | ||
3410 | static void do_free_init(struct rcu_head *head) | |
3411 | { | |
3412 | struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); | |
3413 | module_memfree(m->module_init); | |
3414 | kfree(m); | |
3415 | } | |
3416 | ||
be02a186 JK |
3417 | /* |
3418 | * This is where the real work happens. | |
3419 | * | |
3420 | * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb | |
3421 | * helper command 'lx-symbols'. | |
3422 | */ | |
3423 | static noinline int do_init_module(struct module *mod) | |
34e1169d KC |
3424 | { |
3425 | int ret = 0; | |
c7496379 RR |
3426 | struct mod_initfree *freeinit; |
3427 | ||
3428 | freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); | |
3429 | if (!freeinit) { | |
3430 | ret = -ENOMEM; | |
3431 | goto fail; | |
3432 | } | |
7523e4dc | 3433 | freeinit->module_init = mod->init_layout.base; |
34e1169d | 3434 | |
774a1221 TH |
3435 | /* |
3436 | * We want to find out whether @mod uses async during init. Clear | |
3437 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3438 | */ | |
3439 | current->flags &= ~PF_USED_ASYNC; | |
3440 | ||
34e1169d KC |
3441 | do_mod_ctors(mod); |
3442 | /* Start the module */ | |
3443 | if (mod->init != NULL) | |
3444 | ret = do_one_initcall(mod->init); | |
3445 | if (ret < 0) { | |
c7496379 | 3446 | goto fail_free_freeinit; |
34e1169d KC |
3447 | } |
3448 | if (ret > 0) { | |
bddb12b3 AM |
3449 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
3450 | "follow 0/-E convention\n" | |
3451 | "%s: loading module anyway...\n", | |
3452 | __func__, mod->name, ret, __func__); | |
34e1169d KC |
3453 | dump_stack(); |
3454 | } | |
3455 | ||
3456 | /* Now it's a first class citizen! */ | |
3457 | mod->state = MODULE_STATE_LIVE; | |
3458 | blocking_notifier_call_chain(&module_notify_list, | |
3459 | MODULE_STATE_LIVE, mod); | |
3460 | ||
774a1221 TH |
3461 | /* |
3462 | * We need to finish all async code before the module init sequence | |
3463 | * is done. This has potential to deadlock. For example, a newly | |
3464 | * detected block device can trigger request_module() of the | |
3465 | * default iosched from async probing task. Once userland helper | |
3466 | * reaches here, async_synchronize_full() will wait on the async | |
3467 | * task waiting on request_module() and deadlock. | |
3468 | * | |
3469 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3470 | * iff module init queued any async jobs. This isn't a full | |
3471 | * solution as it will deadlock the same if module loading from | |
3472 | * async jobs nests more than once; however, due to the various | |
3473 | * constraints, this hack seems to be the best option for now. | |
3474 | * Please refer to the following thread for details. | |
3475 | * | |
3476 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3477 | */ | |
f2411da7 | 3478 | if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221 | 3479 | async_synchronize_full(); |
34e1169d KC |
3480 | |
3481 | mutex_lock(&module_mutex); | |
3482 | /* Drop initial reference. */ | |
3483 | module_put(mod); | |
3484 | trim_init_extable(mod); | |
3485 | #ifdef CONFIG_KALLSYMS | |
8244062e RR |
3486 | /* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
3487 | rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); | |
34e1169d | 3488 | #endif |
444d13ff | 3489 | module_enable_ro(mod, true); |
93c2e105 | 3490 | mod_tree_remove_init(mod); |
85c898db | 3491 | disable_ro_nx(&mod->init_layout); |
d453cded | 3492 | module_arch_freeing_init(mod); |
7523e4dc RR |
3493 | mod->init_layout.base = NULL; |
3494 | mod->init_layout.size = 0; | |
3495 | mod->init_layout.ro_size = 0; | |
444d13ff | 3496 | mod->init_layout.ro_after_init_size = 0; |
7523e4dc | 3497 | mod->init_layout.text_size = 0; |
c7496379 RR |
3498 | /* |
3499 | * We want to free module_init, but be aware that kallsyms may be | |
0be964be PZ |
3500 | * walking this with preempt disabled. In all the failure paths, we |
3501 | * call synchronize_sched(), but we don't want to slow down the success | |
3502 | * path, so use actual RCU here. | |
c7496379 | 3503 | */ |
0be964be | 3504 | call_rcu_sched(&freeinit->rcu, do_free_init); |
34e1169d KC |
3505 | mutex_unlock(&module_mutex); |
3506 | wake_up_all(&module_wq); | |
3507 | ||
3508 | return 0; | |
c7496379 RR |
3509 | |
3510 | fail_free_freeinit: | |
3511 | kfree(freeinit); | |
3512 | fail: | |
3513 | /* Try to protect us from buggy refcounters. */ | |
3514 | mod->state = MODULE_STATE_GOING; | |
3515 | synchronize_sched(); | |
3516 | module_put(mod); | |
3517 | blocking_notifier_call_chain(&module_notify_list, | |
3518 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3519 | klp_module_going(mod); |
7dcd182b | 3520 | ftrace_release_mod(mod); |
c7496379 RR |
3521 | free_module(mod); |
3522 | wake_up_all(&module_wq); | |
3523 | return ret; | |
34e1169d KC |
3524 | } |
3525 | ||
3526 | static int may_init_module(void) | |
3527 | { | |
3528 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3529 | return -EPERM; | |
3530 | ||
3531 | return 0; | |
3532 | } | |
3533 | ||
a3535c7e RR |
3534 | /* |
3535 | * We try to place it in the list now to make sure it's unique before | |
3536 | * we dedicate too many resources. In particular, temporary percpu | |
3537 | * memory exhaustion. | |
3538 | */ | |
3539 | static int add_unformed_module(struct module *mod) | |
3540 | { | |
3541 | int err; | |
3542 | struct module *old; | |
3543 | ||
3544 | mod->state = MODULE_STATE_UNFORMED; | |
3545 | ||
3546 | again: | |
3547 | mutex_lock(&module_mutex); | |
4f6de4d5 MK |
3548 | old = find_module_all(mod->name, strlen(mod->name), true); |
3549 | if (old != NULL) { | |
a3535c7e RR |
3550 | if (old->state == MODULE_STATE_COMING |
3551 | || old->state == MODULE_STATE_UNFORMED) { | |
3552 | /* Wait in case it fails to load. */ | |
3553 | mutex_unlock(&module_mutex); | |
9cc019b8 PZ |
3554 | err = wait_event_interruptible(module_wq, |
3555 | finished_loading(mod->name)); | |
a3535c7e RR |
3556 | if (err) |
3557 | goto out_unlocked; | |
3558 | goto again; | |
3559 | } | |
3560 | err = -EEXIST; | |
3561 | goto out; | |
3562 | } | |
4f666546 | 3563 | mod_update_bounds(mod); |
a3535c7e | 3564 | list_add_rcu(&mod->list, &modules); |
93c2e105 | 3565 | mod_tree_insert(mod); |
a3535c7e RR |
3566 | err = 0; |
3567 | ||
3568 | out: | |
3569 | mutex_unlock(&module_mutex); | |
3570 | out_unlocked: | |
3571 | return err; | |
3572 | } | |
3573 | ||
3574 | static int complete_formation(struct module *mod, struct load_info *info) | |
3575 | { | |
3576 | int err; | |
3577 | ||
3578 | mutex_lock(&module_mutex); | |
3579 | ||
3580 | /* Find duplicate symbols (must be called under lock). */ | |
3581 | err = verify_export_symbols(mod); | |
3582 | if (err < 0) | |
3583 | goto out; | |
3584 | ||
3585 | /* This relies on module_mutex for list integrity. */ | |
3586 | module_bug_finalize(info->hdr, info->sechdrs, mod); | |
3587 | ||
444d13ff | 3588 | module_enable_ro(mod, false); |
85c898db | 3589 | module_enable_nx(mod); |
4982223e | 3590 | |
a3535c7e RR |
3591 | /* Mark state as coming so strong_try_module_get() ignores us, |
3592 | * but kallsyms etc. can see us. */ | |
3593 | mod->state = MODULE_STATE_COMING; | |
4982223e RR |
3594 | mutex_unlock(&module_mutex); |
3595 | ||
4982223e | 3596 | return 0; |
a3535c7e RR |
3597 | |
3598 | out: | |
3599 | mutex_unlock(&module_mutex); | |
3600 | return err; | |
3601 | } | |
3602 | ||
4c973d16 JY |
3603 | static int prepare_coming_module(struct module *mod) |
3604 | { | |
7e545d6e JY |
3605 | int err; |
3606 | ||
4c973d16 | 3607 | ftrace_module_enable(mod); |
7e545d6e JY |
3608 | err = klp_module_coming(mod); |
3609 | if (err) | |
3610 | return err; | |
3611 | ||
4c973d16 JY |
3612 | blocking_notifier_call_chain(&module_notify_list, |
3613 | MODULE_STATE_COMING, mod); | |
3614 | return 0; | |
3615 | } | |
3616 | ||
ecc86170 LR |
3617 | static int unknown_module_param_cb(char *param, char *val, const char *modname, |
3618 | void *arg) | |
54041d8a | 3619 | { |
f2411da7 LR |
3620 | struct module *mod = arg; |
3621 | int ret; | |
3622 | ||
3623 | if (strcmp(param, "async_probe") == 0) { | |
3624 | mod->async_probe_requested = true; | |
3625 | return 0; | |
3626 | } | |
3627 | ||
6da0b565 | 3628 | /* Check for magic 'dyndbg' arg */ |
f2411da7 | 3629 | ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b3 AM |
3630 | if (ret != 0) |
3631 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); | |
54041d8a RR |
3632 | return 0; |
3633 | } | |
3634 | ||
d913188c RR |
3635 | /* Allocate and load the module: note that size of section 0 is always |
3636 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3637 | static int load_module(struct load_info *info, const char __user *uargs, |
3638 | int flags) | |
d913188c | 3639 | { |
a3535c7e | 3640 | struct module *mod; |
d913188c | 3641 | long err; |
51e158c1 | 3642 | char *after_dashes; |
d913188c | 3643 | |
bca014ca | 3644 | err = module_sig_check(info, flags); |
34e1169d KC |
3645 | if (err) |
3646 | goto free_copy; | |
d913188c | 3647 | |
34e1169d | 3648 | err = elf_header_check(info); |
d913188c | 3649 | if (err) |
34e1169d | 3650 | goto free_copy; |
d913188c RR |
3651 | |
3652 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3653 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3654 | if (IS_ERR(mod)) { |
3655 | err = PTR_ERR(mod); | |
d913188c | 3656 | goto free_copy; |
1da177e4 | 3657 | } |
1da177e4 | 3658 | |
ca86cad7 RGB |
3659 | audit_log_kern_module(mod->name); |
3660 | ||
a3535c7e RR |
3661 | /* Reserve our place in the list. */ |
3662 | err = add_unformed_module(mod); | |
3663 | if (err) | |
1fb9341a | 3664 | goto free_module; |
1fb9341a | 3665 | |
106a4ee2 | 3666 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3667 | mod->sig_ok = info->sig_ok; |
64748a2c | 3668 | if (!mod->sig_ok) { |
bddb12b3 | 3669 | pr_notice_once("%s: module verification failed: signature " |
ab92ebbb | 3670 | "and/or required key missing - tainting " |
bddb12b3 | 3671 | "kernel\n", mod->name); |
66cc69e3 | 3672 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c | 3673 | } |
106a4ee2 RR |
3674 | #endif |
3675 | ||
8d8022e8 | 3676 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d77 | 3677 | err = percpu_modalloc(mod, info); |
8d8022e8 RR |
3678 | if (err) |
3679 | goto unlink_mod; | |
3680 | ||
49668688 | 3681 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3682 | err = module_unload_init(mod); |
3683 | if (err) | |
1fb9341a | 3684 | goto unlink_mod; |
1da177e4 | 3685 | |
cf2fde7b | 3686 | init_param_lock(mod); |
b51d23e4 | 3687 | |
22e268eb RR |
3688 | /* Now we've got everything in the final locations, we can |
3689 | * find optional sections. */ | |
eb3057df FH |
3690 | err = find_module_sections(mod, info); |
3691 | if (err) | |
3692 | goto free_unload; | |
9b37ccfc | 3693 | |
49668688 | 3694 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3695 | if (err) |
3696 | goto free_unload; | |
9841d61d | 3697 | |
c988d2b2 | 3698 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3699 | setup_modinfo(mod, info); |
c988d2b2 | 3700 | |
1da177e4 | 3701 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3702 | err = simplify_symbols(mod, info); |
1da177e4 | 3703 | if (err < 0) |
d913188c | 3704 | goto free_modinfo; |
1da177e4 | 3705 | |
34e1169d | 3706 | err = apply_relocations(mod, info); |
22e268eb | 3707 | if (err < 0) |
d913188c | 3708 | goto free_modinfo; |
1da177e4 | 3709 | |
34e1169d | 3710 | err = post_relocation(mod, info); |
1da177e4 | 3711 | if (err < 0) |
d913188c | 3712 | goto free_modinfo; |
1da177e4 | 3713 | |
22e268eb | 3714 | flush_module_icache(mod); |
378bac82 | 3715 | |
6526c534 RR |
3716 | /* Now copy in args */ |
3717 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3718 | if (IS_ERR(mod->args)) { | |
3719 | err = PTR_ERR(mod->args); | |
3720 | goto free_arch_cleanup; | |
3721 | } | |
8d3b33f6 | 3722 | |
34e1169d | 3723 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3724 | |
a949ae56 SRRH |
3725 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
3726 | ftrace_module_init(mod); | |
3727 | ||
a3535c7e RR |
3728 | /* Finally it's fully formed, ready to start executing. */ |
3729 | err = complete_formation(mod, info); | |
3730 | if (err) | |
1fb9341a | 3731 | goto ddebug_cleanup; |
be593f4c | 3732 | |
4c973d16 JY |
3733 | err = prepare_coming_module(mod); |
3734 | if (err) | |
3735 | goto bug_cleanup; | |
3736 | ||
51f3d0f4 | 3737 | /* Module is ready to execute: parsing args may do that. */ |
51e158c1 | 3738 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
4355efbd | 3739 | -32768, 32767, mod, |
ecc86170 | 3740 | unknown_module_param_cb); |
51e158c1 RR |
3741 | if (IS_ERR(after_dashes)) { |
3742 | err = PTR_ERR(after_dashes); | |
4c973d16 | 3743 | goto coming_cleanup; |
51e158c1 RR |
3744 | } else if (after_dashes) { |
3745 | pr_warn("%s: parameters '%s' after `--' ignored\n", | |
3746 | mod->name, after_dashes); | |
3747 | } | |
1da177e4 | 3748 | |
ca86cad7 | 3749 | /* Link in to sysfs. */ |
34e1169d | 3750 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3751 | if (err < 0) |
4c973d16 | 3752 | goto coming_cleanup; |
80a3d1bb | 3753 | |
1ce15ef4 JY |
3754 | if (is_livepatch_module(mod)) { |
3755 | err = copy_module_elf(mod, info); | |
3756 | if (err < 0) | |
3757 | goto sysfs_cleanup; | |
3758 | } | |
3759 | ||
48fd1188 | 3760 | /* Get rid of temporary copy. */ |
34e1169d | 3761 | free_copy(info); |
1da177e4 LT |
3762 | |
3763 | /* Done! */ | |
51f3d0f4 | 3764 | trace_module_load(mod); |
34e1169d KC |
3765 | |
3766 | return do_init_module(mod); | |
1da177e4 | 3767 | |
1ce15ef4 JY |
3768 | sysfs_cleanup: |
3769 | mod_sysfs_teardown(mod); | |
4c973d16 | 3770 | coming_cleanup: |
885a78d4 | 3771 | mod->state = MODULE_STATE_GOING; |
a5544880 | 3772 | destroy_params(mod->kp, mod->num_kp); |
4c973d16 JY |
3773 | blocking_notifier_call_chain(&module_notify_list, |
3774 | MODULE_STATE_GOING, mod); | |
7e545d6e | 3775 | klp_module_going(mod); |
1fb9341a RR |
3776 | bug_cleanup: |
3777 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3778 | mutex_lock(&module_mutex); |
5336377d | 3779 | module_bug_cleanup(mod); |
ee61abb3 | 3780 | mutex_unlock(&module_mutex); |
ff7e0055 AL |
3781 | |
3782 | /* we can't deallocate the module until we clear memory protection */ | |
85c898db RR |
3783 | module_disable_ro(mod); |
3784 | module_disable_nx(mod); | |
ff7e0055 | 3785 | |
a3535c7e | 3786 | ddebug_cleanup: |
1fb9341a | 3787 | dynamic_debug_remove(info->debug); |
e91defa2 | 3788 | synchronize_sched(); |
6526c534 RR |
3789 | kfree(mod->args); |
3790 | free_arch_cleanup: | |
1da177e4 | 3791 | module_arch_cleanup(mod); |
d913188c | 3792 | free_modinfo: |
a263f776 | 3793 | free_modinfo(mod); |
22e268eb | 3794 | free_unload: |
1da177e4 | 3795 | module_unload_free(mod); |
1fb9341a RR |
3796 | unlink_mod: |
3797 | mutex_lock(&module_mutex); | |
3798 | /* Unlink carefully: kallsyms could be walking list. */ | |
3799 | list_del_rcu(&mod->list); | |
758556bd | 3800 | mod_tree_remove(mod); |
1fb9341a | 3801 | wake_up_all(&module_wq); |
0be964be PZ |
3802 | /* Wait for RCU-sched synchronizing before releasing mod->list. */ |
3803 | synchronize_sched(); | |
1fb9341a | 3804 | mutex_unlock(&module_mutex); |
d913188c | 3805 | free_module: |
049fb9bd SRRH |
3806 | /* |
3807 | * Ftrace needs to clean up what it initialized. | |
3808 | * This does nothing if ftrace_module_init() wasn't called, | |
3809 | * but it must be called outside of module_mutex. | |
3810 | */ | |
3811 | ftrace_release_mod(mod); | |
35a9393c | 3812 | /* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc | 3813 | lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c | 3814 | |
34e1169d | 3815 | module_deallocate(mod, info); |
d913188c | 3816 | free_copy: |
34e1169d KC |
3817 | free_copy(info); |
3818 | return err; | |
b99b87f7 PO |
3819 | } |
3820 | ||
17da2bd9 HC |
3821 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3822 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3823 | { |
34e1169d KC |
3824 | int err; |
3825 | struct load_info info = { }; | |
1da177e4 | 3826 | |
34e1169d KC |
3827 | err = may_init_module(); |
3828 | if (err) | |
3829 | return err; | |
1da177e4 | 3830 | |
34e1169d KC |
3831 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3832 | umod, len, uargs); | |
1da177e4 | 3833 | |
34e1169d KC |
3834 | err = copy_module_from_user(umod, len, &info); |
3835 | if (err) | |
3836 | return err; | |
1da177e4 | 3837 | |
2f3238ae | 3838 | return load_module(&info, uargs, 0); |
34e1169d | 3839 | } |
94462ad3 | 3840 | |
2f3238ae | 3841 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d | 3842 | { |
34e1169d | 3843 | struct load_info info = { }; |
a1db7420 MZ |
3844 | loff_t size; |
3845 | void *hdr; | |
3846 | int err; | |
94462ad3 | 3847 | |
34e1169d KC |
3848 | err = may_init_module(); |
3849 | if (err) | |
3850 | return err; | |
1da177e4 | 3851 | |
2f3238ae | 3852 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3853 | |
2f3238ae RR |
3854 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3855 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3856 | return -EINVAL; | |
d6de2c80 | 3857 | |
a1db7420 MZ |
3858 | err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX, |
3859 | READING_MODULE); | |
34e1169d KC |
3860 | if (err) |
3861 | return err; | |
a1db7420 MZ |
3862 | info.hdr = hdr; |
3863 | info.len = size; | |
1da177e4 | 3864 | |
2f3238ae | 3865 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3866 | } |
3867 | ||
3868 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3869 | { | |
3870 | return ((void *)addr >= start && (void *)addr < start + size); | |
3871 | } | |
3872 | ||
3873 | #ifdef CONFIG_KALLSYMS | |
3874 | /* | |
3875 | * This ignores the intensely annoying "mapping symbols" found | |
3876 | * in ARM ELF files: $a, $t and $d. | |
3877 | */ | |
3878 | static inline int is_arm_mapping_symbol(const char *str) | |
3879 | { | |
2e3a10a1 RK |
3880 | if (str[0] == '.' && str[1] == 'L') |
3881 | return true; | |
6c34f1f5 | 3882 | return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4 LT |
3883 | && (str[2] == '\0' || str[2] == '.'); |
3884 | } | |
3885 | ||
8244062e | 3886 | static const char *symname(struct mod_kallsyms *kallsyms, unsigned int symnum) |
2e7bac53 | 3887 | { |
8244062e | 3888 | return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
2e7bac53 RR |
3889 | } |
3890 | ||
1da177e4 LT |
3891 | static const char *get_ksymbol(struct module *mod, |
3892 | unsigned long addr, | |
3893 | unsigned long *size, | |
3894 | unsigned long *offset) | |
3895 | { | |
3896 | unsigned int i, best = 0; | |
3897 | unsigned long nextval; | |
8244062e | 3898 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 LT |
3899 | |
3900 | /* At worse, next value is at end of module */ | |
a06f6211 | 3901 | if (within_module_init(addr, mod)) |
7523e4dc | 3902 | nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb | 3903 | else |
7523e4dc | 3904 | nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4 | 3905 | |
25985edc | 3906 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3907 | starts real symbols at 1). */ |
8244062e RR |
3908 | for (i = 1; i < kallsyms->num_symtab; i++) { |
3909 | if (kallsyms->symtab[i].st_shndx == SHN_UNDEF) | |
1da177e4 LT |
3910 | continue; |
3911 | ||
3912 | /* We ignore unnamed symbols: they're uninformative | |
3913 | * and inserted at a whim. */ | |
8244062e RR |
3914 | if (*symname(kallsyms, i) == '\0' |
3915 | || is_arm_mapping_symbol(symname(kallsyms, i))) | |
2e7bac53 RR |
3916 | continue; |
3917 | ||
8244062e RR |
3918 | if (kallsyms->symtab[i].st_value <= addr |
3919 | && kallsyms->symtab[i].st_value > kallsyms->symtab[best].st_value) | |
1da177e4 | 3920 | best = i; |
8244062e RR |
3921 | if (kallsyms->symtab[i].st_value > addr |
3922 | && kallsyms->symtab[i].st_value < nextval) | |
3923 | nextval = kallsyms->symtab[i].st_value; | |
1da177e4 LT |
3924 | } |
3925 | ||
3926 | if (!best) | |
3927 | return NULL; | |
3928 | ||
ffb45122 | 3929 | if (size) |
8244062e | 3930 | *size = nextval - kallsyms->symtab[best].st_value; |
ffb45122 | 3931 | if (offset) |
8244062e RR |
3932 | *offset = addr - kallsyms->symtab[best].st_value; |
3933 | return symname(kallsyms, best); | |
1da177e4 LT |
3934 | } |
3935 | ||
6dd06c9f RR |
3936 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3937 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3938 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3939 | unsigned long *size, |
3940 | unsigned long *offset, | |
3941 | char **modname, | |
3942 | char *namebuf) | |
1da177e4 | 3943 | { |
cb2a5205 | 3944 | const char *ret = NULL; |
b7df4d1b | 3945 | struct module *mod; |
1da177e4 | 3946 | |
cb2a5205 | 3947 | preempt_disable(); |
b7df4d1b PZ |
3948 | mod = __module_address(addr); |
3949 | if (mod) { | |
3950 | if (modname) | |
3951 | *modname = mod->name; | |
3952 | ret = get_ksymbol(mod, addr, size, offset); | |
1da177e4 | 3953 | } |
6dd06c9f RR |
3954 | /* Make a copy in here where it's safe */ |
3955 | if (ret) { | |
3956 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3957 | ret = namebuf; | |
3958 | } | |
cb2a5205 | 3959 | preempt_enable(); |
b7df4d1b | 3960 | |
92dfc9dc | 3961 | return ret; |
1da177e4 LT |
3962 | } |
3963 | ||
9d65cb4a AD |
3964 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3965 | { | |
3966 | struct module *mod; | |
3967 | ||
cb2a5205 | 3968 | preempt_disable(); |
d72b3751 | 3969 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3970 | if (mod->state == MODULE_STATE_UNFORMED) |
3971 | continue; | |
9b20a352 | 3972 | if (within_module(addr, mod)) { |
9d65cb4a AD |
3973 | const char *sym; |
3974 | ||
3975 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3976 | if (!sym) | |
3977 | goto out; | |
9281acea | 3978 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3979 | preempt_enable(); |
9d65cb4a AD |
3980 | return 0; |
3981 | } | |
3982 | } | |
3983 | out: | |
cb2a5205 | 3984 | preempt_enable(); |
9d65cb4a AD |
3985 | return -ERANGE; |
3986 | } | |
3987 | ||
a5c43dae AD |
3988 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3989 | unsigned long *offset, char *modname, char *name) | |
3990 | { | |
3991 | struct module *mod; | |
3992 | ||
cb2a5205 | 3993 | preempt_disable(); |
d72b3751 | 3994 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3995 | if (mod->state == MODULE_STATE_UNFORMED) |
3996 | continue; | |
9b20a352 | 3997 | if (within_module(addr, mod)) { |
a5c43dae AD |
3998 | const char *sym; |
3999 | ||
4000 | sym = get_ksymbol(mod, addr, size, offset); | |
4001 | if (!sym) | |
4002 | goto out; | |
4003 | if (modname) | |
9281acea | 4004 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 4005 | if (name) |
9281acea | 4006 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 4007 | preempt_enable(); |
a5c43dae AD |
4008 | return 0; |
4009 | } | |
4010 | } | |
4011 | out: | |
cb2a5205 | 4012 | preempt_enable(); |
a5c43dae AD |
4013 | return -ERANGE; |
4014 | } | |
4015 | ||
ea07890a AD |
4016 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
4017 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
4018 | { |
4019 | struct module *mod; | |
4020 | ||
cb2a5205 | 4021 | preempt_disable(); |
d72b3751 | 4022 | list_for_each_entry_rcu(mod, &modules, list) { |
8244062e RR |
4023 | struct mod_kallsyms *kallsyms; |
4024 | ||
0d21b0e3 RR |
4025 | if (mod->state == MODULE_STATE_UNFORMED) |
4026 | continue; | |
8244062e RR |
4027 | kallsyms = rcu_dereference_sched(mod->kallsyms); |
4028 | if (symnum < kallsyms->num_symtab) { | |
4029 | *value = kallsyms->symtab[symnum].st_value; | |
4030 | *type = kallsyms->symtab[symnum].st_info; | |
4031 | strlcpy(name, symname(kallsyms, symnum), KSYM_NAME_LEN); | |
9281acea | 4032 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b7 | 4033 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 4034 | preempt_enable(); |
ea07890a | 4035 | return 0; |
1da177e4 | 4036 | } |
8244062e | 4037 | symnum -= kallsyms->num_symtab; |
1da177e4 | 4038 | } |
cb2a5205 | 4039 | preempt_enable(); |
ea07890a | 4040 | return -ERANGE; |
1da177e4 LT |
4041 | } |
4042 | ||
4043 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
4044 | { | |
4045 | unsigned int i; | |
8244062e | 4046 | struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
1da177e4 | 4047 | |
8244062e RR |
4048 | for (i = 0; i < kallsyms->num_symtab; i++) |
4049 | if (strcmp(name, symname(kallsyms, i)) == 0 && | |
4050 | kallsyms->symtab[i].st_info != 'U') | |
4051 | return kallsyms->symtab[i].st_value; | |
1da177e4 LT |
4052 | return 0; |
4053 | } | |
4054 | ||
4055 | /* Look for this name: can be of form module:name. */ | |
4056 | unsigned long module_kallsyms_lookup_name(const char *name) | |
4057 | { | |
4058 | struct module *mod; | |
4059 | char *colon; | |
4060 | unsigned long ret = 0; | |
4061 | ||
4062 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 4063 | preempt_disable(); |
17586188 | 4064 | if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
4f6de4d5 | 4065 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4 | 4066 | ret = mod_find_symname(mod, colon+1); |
1da177e4 | 4067 | } else { |
0d21b0e3 RR |
4068 | list_for_each_entry_rcu(mod, &modules, list) { |
4069 | if (mod->state == MODULE_STATE_UNFORMED) | |
4070 | continue; | |
1da177e4 LT |
4071 | if ((ret = mod_find_symname(mod, name)) != 0) |
4072 | break; | |
0d21b0e3 | 4073 | } |
1da177e4 | 4074 | } |
cb2a5205 | 4075 | preempt_enable(); |
1da177e4 LT |
4076 | return ret; |
4077 | } | |
75a66614 AK |
4078 | |
4079 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
4080 | struct module *, unsigned long), | |
4081 | void *data) | |
4082 | { | |
4083 | struct module *mod; | |
4084 | unsigned int i; | |
4085 | int ret; | |
4086 | ||
0be964be PZ |
4087 | module_assert_mutex(); |
4088 | ||
75a66614 | 4089 | list_for_each_entry(mod, &modules, list) { |
8244062e RR |
4090 | /* We hold module_mutex: no need for rcu_dereference_sched */ |
4091 | struct mod_kallsyms *kallsyms = mod->kallsyms; | |
4092 | ||
0d21b0e3 RR |
4093 | if (mod->state == MODULE_STATE_UNFORMED) |
4094 | continue; | |
8244062e RR |
4095 | for (i = 0; i < kallsyms->num_symtab; i++) { |
4096 | ret = fn(data, symname(kallsyms, i), | |
4097 | mod, kallsyms->symtab[i].st_value); | |
75a66614 AK |
4098 | if (ret != 0) |
4099 | return ret; | |
4100 | } | |
4101 | } | |
4102 | return 0; | |
4103 | } | |
1da177e4 LT |
4104 | #endif /* CONFIG_KALLSYMS */ |
4105 | ||
7fd8329b PM |
4106 | /* Maximum number of characters written by module_flags() */ |
4107 | #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) | |
4108 | ||
4109 | /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ | |
21aa9280 | 4110 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
4111 | { |
4112 | int bx = 0; | |
4113 | ||
0d21b0e3 | 4114 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
4115 | if (mod->taints || |
4116 | mod->state == MODULE_STATE_GOING || | |
4117 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 4118 | buf[bx++] = '('; |
cca3e707 | 4119 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
4120 | /* Show a - for module-is-being-unloaded */ |
4121 | if (mod->state == MODULE_STATE_GOING) | |
4122 | buf[bx++] = '-'; | |
4123 | /* Show a + for module-is-being-loaded */ | |
4124 | if (mod->state == MODULE_STATE_COMING) | |
4125 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
4126 | buf[bx++] = ')'; |
4127 | } | |
4128 | buf[bx] = '\0'; | |
4129 | ||
4130 | return buf; | |
4131 | } | |
4132 | ||
3b5d5c6b AD |
4133 | #ifdef CONFIG_PROC_FS |
4134 | /* Called by the /proc file system to return a list of modules. */ | |
4135 | static void *m_start(struct seq_file *m, loff_t *pos) | |
4136 | { | |
4137 | mutex_lock(&module_mutex); | |
4138 | return seq_list_start(&modules, *pos); | |
4139 | } | |
4140 | ||
4141 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
4142 | { | |
4143 | return seq_list_next(p, &modules, pos); | |
4144 | } | |
4145 | ||
4146 | static void m_stop(struct seq_file *m, void *p) | |
4147 | { | |
4148 | mutex_unlock(&module_mutex); | |
4149 | } | |
4150 | ||
1da177e4 LT |
4151 | static int m_show(struct seq_file *m, void *p) |
4152 | { | |
4153 | struct module *mod = list_entry(p, struct module, list); | |
7fd8329b | 4154 | char buf[MODULE_FLAGS_BUF_SIZE]; |
fa3ba2e8 | 4155 | |
0d21b0e3 RR |
4156 | /* We always ignore unformed modules. */ |
4157 | if (mod->state == MODULE_STATE_UNFORMED) | |
4158 | return 0; | |
4159 | ||
2f0f2a33 | 4160 | seq_printf(m, "%s %u", |
7523e4dc | 4161 | mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4 LT |
4162 | print_unload_info(m, mod); |
4163 | ||
4164 | /* Informative for users. */ | |
4165 | seq_printf(m, " %s", | |
6da0b565 IA |
4166 | mod->state == MODULE_STATE_GOING ? "Unloading" : |
4167 | mod->state == MODULE_STATE_COMING ? "Loading" : | |
1da177e4 LT |
4168 | "Live"); |
4169 | /* Used by oprofile and other similar tools. */ | |
7523e4dc | 4170 | seq_printf(m, " 0x%pK", mod->core_layout.base); |
1da177e4 | 4171 | |
fa3ba2e8 FM |
4172 | /* Taints info */ |
4173 | if (mod->taints) | |
21aa9280 | 4174 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 4175 | |
6da0b565 | 4176 | seq_puts(m, "\n"); |
1da177e4 LT |
4177 | return 0; |
4178 | } | |
4179 | ||
4180 | /* Format: modulename size refcount deps address | |
4181 | ||
4182 | Where refcount is a number or -, and deps is a comma-separated list | |
4183 | of depends or -. | |
4184 | */ | |
3b5d5c6b | 4185 | static const struct seq_operations modules_op = { |
1da177e4 LT |
4186 | .start = m_start, |
4187 | .next = m_next, | |
4188 | .stop = m_stop, | |
4189 | .show = m_show | |
4190 | }; | |
4191 | ||
3b5d5c6b AD |
4192 | static int modules_open(struct inode *inode, struct file *file) |
4193 | { | |
4194 | return seq_open(file, &modules_op); | |
4195 | } | |
4196 | ||
4197 | static const struct file_operations proc_modules_operations = { | |
4198 | .open = modules_open, | |
4199 | .read = seq_read, | |
4200 | .llseek = seq_lseek, | |
4201 | .release = seq_release, | |
4202 | }; | |
4203 | ||
4204 | static int __init proc_modules_init(void) | |
4205 | { | |
4206 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
4207 | return 0; | |
4208 | } | |
4209 | module_init(proc_modules_init); | |
4210 | #endif | |
4211 | ||
1da177e4 LT |
4212 | /* Given an address, look for it in the module exception tables. */ |
4213 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
4214 | { | |
1da177e4 LT |
4215 | const struct exception_table_entry *e = NULL; |
4216 | struct module *mod; | |
4217 | ||
24da1cbf | 4218 | preempt_disable(); |
5ff22646 PZ |
4219 | mod = __module_address(addr); |
4220 | if (!mod) | |
4221 | goto out; | |
22a8bdeb | 4222 | |
5ff22646 PZ |
4223 | if (!mod->num_exentries) |
4224 | goto out; | |
4225 | ||
4226 | e = search_extable(mod->extable, | |
4227 | mod->extable + mod->num_exentries - 1, | |
4228 | addr); | |
4229 | out: | |
24da1cbf | 4230 | preempt_enable(); |
1da177e4 | 4231 | |
5ff22646 PZ |
4232 | /* |
4233 | * Now, if we found one, we are running inside it now, hence | |
4234 | * we cannot unload the module, hence no refcnt needed. | |
4235 | */ | |
1da177e4 LT |
4236 | return e; |
4237 | } | |
4238 | ||
4d435f9d | 4239 | /* |
e610499e RR |
4240 | * is_module_address - is this address inside a module? |
4241 | * @addr: the address to check. | |
4242 | * | |
4243 | * See is_module_text_address() if you simply want to see if the address | |
4244 | * is code (not data). | |
4d435f9d | 4245 | */ |
e610499e | 4246 | bool is_module_address(unsigned long addr) |
4d435f9d | 4247 | { |
e610499e | 4248 | bool ret; |
4d435f9d | 4249 | |
24da1cbf | 4250 | preempt_disable(); |
e610499e | 4251 | ret = __module_address(addr) != NULL; |
24da1cbf | 4252 | preempt_enable(); |
4d435f9d | 4253 | |
e610499e | 4254 | return ret; |
4d435f9d IM |
4255 | } |
4256 | ||
e610499e RR |
4257 | /* |
4258 | * __module_address - get the module which contains an address. | |
4259 | * @addr: the address. | |
4260 | * | |
4261 | * Must be called with preempt disabled or module mutex held so that | |
4262 | * module doesn't get freed during this. | |
4263 | */ | |
714f83d5 | 4264 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
4265 | { |
4266 | struct module *mod; | |
4267 | ||
3a642e99 RR |
4268 | if (addr < module_addr_min || addr > module_addr_max) |
4269 | return NULL; | |
4270 | ||
0be964be PZ |
4271 | module_assert_mutex_or_preempt(); |
4272 | ||
6c9692e2 | 4273 | mod = mod_find(addr); |
93c2e105 PZ |
4274 | if (mod) { |
4275 | BUG_ON(!within_module(addr, mod)); | |
0d21b0e3 | 4276 | if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105 | 4277 | mod = NULL; |
0d21b0e3 | 4278 | } |
93c2e105 | 4279 | return mod; |
1da177e4 | 4280 | } |
c6b37801 | 4281 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 4282 | |
e610499e RR |
4283 | /* |
4284 | * is_module_text_address - is this address inside module code? | |
4285 | * @addr: the address to check. | |
4286 | * | |
4287 | * See is_module_address() if you simply want to see if the address is | |
4288 | * anywhere in a module. See kernel_text_address() for testing if an | |
4289 | * address corresponds to kernel or module code. | |
4290 | */ | |
4291 | bool is_module_text_address(unsigned long addr) | |
4292 | { | |
4293 | bool ret; | |
4294 | ||
4295 | preempt_disable(); | |
4296 | ret = __module_text_address(addr) != NULL; | |
4297 | preempt_enable(); | |
4298 | ||
4299 | return ret; | |
4300 | } | |
4301 | ||
4302 | /* | |
4303 | * __module_text_address - get the module whose code contains an address. | |
4304 | * @addr: the address. | |
4305 | * | |
4306 | * Must be called with preempt disabled or module mutex held so that | |
4307 | * module doesn't get freed during this. | |
4308 | */ | |
4309 | struct module *__module_text_address(unsigned long addr) | |
4310 | { | |
4311 | struct module *mod = __module_address(addr); | |
4312 | if (mod) { | |
4313 | /* Make sure it's within the text section. */ | |
7523e4dc RR |
4314 | if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
4315 | && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) | |
e610499e RR |
4316 | mod = NULL; |
4317 | } | |
4318 | return mod; | |
4319 | } | |
c6b37801 | 4320 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 4321 | |
1da177e4 LT |
4322 | /* Don't grab lock, we're oopsing. */ |
4323 | void print_modules(void) | |
4324 | { | |
4325 | struct module *mod; | |
7fd8329b | 4326 | char buf[MODULE_FLAGS_BUF_SIZE]; |
1da177e4 | 4327 | |
b231125a | 4328 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
4329 | /* Most callers should already have preempt disabled, but make sure */ |
4330 | preempt_disable(); | |
0d21b0e3 RR |
4331 | list_for_each_entry_rcu(mod, &modules, list) { |
4332 | if (mod->state == MODULE_STATE_UNFORMED) | |
4333 | continue; | |
27bba4d6 | 4334 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 4335 | } |
d72b3751 | 4336 | preempt_enable(); |
e14af7ee | 4337 | if (last_unloaded_module[0]) |
27bba4d6 JS |
4338 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
4339 | pr_cont("\n"); | |
1da177e4 LT |
4340 | } |
4341 | ||
1da177e4 | 4342 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
4343 | /* Generate the signature for all relevant module structures here. |
4344 | * If these change, we don't want to try to parse the module. */ | |
4345 | void module_layout(struct module *mod, | |
4346 | struct modversion_info *ver, | |
4347 | struct kernel_param *kp, | |
4348 | struct kernel_symbol *ks, | |
65498646 | 4349 | struct tracepoint * const *tp) |
8c8ef42a RR |
4350 | { |
4351 | } | |
4352 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 4353 | #endif |