kthread: rename probe_kthread_data() to kthread_probe_data()
[linux-2.6-block.git] / kernel / module.c
CommitLineData
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>
1da177e4 20#include <linux/moduleloader.h>
af658dca 21#include <linux/trace_events.h>
1da177e4 22#include <linux/init.h>
ae84e324 23#include <linux/kallsyms.h>
34e1169d 24#include <linux/file.h>
3b5d5c6b 25#include <linux/fs.h>
6d760133 26#include <linux/sysfs.h>
9f158333 27#include <linux/kernel.h>
1da177e4
LT
28#include <linux/slab.h>
29#include <linux/vmalloc.h>
30#include <linux/elf.h>
3b5d5c6b 31#include <linux/proc_fs.h>
2e72d51b 32#include <linux/security.h>
1da177e4
LT
33#include <linux/seq_file.h>
34#include <linux/syscalls.h>
35#include <linux/fcntl.h>
36#include <linux/rcupdate.h>
c59ede7b 37#include <linux/capability.h>
1da177e4
LT
38#include <linux/cpu.h>
39#include <linux/moduleparam.h>
40#include <linux/errno.h>
41#include <linux/err.h>
42#include <linux/vermagic.h>
43#include <linux/notifier.h>
f6a57033 44#include <linux/sched.h>
1da177e4 45#include <linux/device.h>
c988d2b2 46#include <linux/string.h>
97d1f15b 47#include <linux/mutex.h>
d72b3751 48#include <linux/rculist.h>
1da177e4 49#include <asm/uaccess.h>
1da177e4 50#include <asm/cacheflush.h>
eb8cdec4 51#include <asm/mmu_context.h>
b817f6fe 52#include <linux/license.h>
6d762394 53#include <asm/sections.h>
97e1c18e 54#include <linux/tracepoint.h>
90d595fe 55#include <linux/ftrace.h>
7e545d6e 56#include <linux/livepatch.h>
22a9d645 57#include <linux/async.h>
fbf59bc9 58#include <linux/percpu.h>
4f2294b6 59#include <linux/kmemleak.h>
bf5438fc 60#include <linux/jump_label.h>
84e1c6bb 61#include <linux/pfn.h>
403ed278 62#include <linux/bsearch.h>
9d5059c9 63#include <linux/dynamic_debug.h>
2f3238ae 64#include <uapi/linux/module.h>
106a4ee2 65#include "module-internal.h"
1da177e4 66
7ead8b83
LZ
67#define CREATE_TRACE_POINTS
68#include <trace/events/module.h>
69
1da177e4
LT
70#ifndef ARCH_SHF_SMALL
71#define ARCH_SHF_SMALL 0
72#endif
73
84e1c6bb 74/*
75 * Modules' sections will be aligned on page boundaries
76 * to ensure complete separation of code and data, but
77 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
78 */
79#ifdef CONFIG_DEBUG_SET_MODULE_RONX
80# define debug_align(X) ALIGN(X, PAGE_SIZE)
81#else
82# define debug_align(X) (X)
83#endif
84
1da177e4
LT
85/* If this is set, the section belongs in the init part of the module */
86#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
87
75676500
RR
88/*
89 * Mutex protects:
90 * 1) List of modules (also safely readable with preempt_disable),
91 * 2) module_use links,
92 * 3) module_addr_min/module_addr_max.
e513cc1c 93 * (delete and add uses RCU list operations). */
c6b37801
TA
94DEFINE_MUTEX(module_mutex);
95EXPORT_SYMBOL_GPL(module_mutex);
1da177e4 96static LIST_HEAD(modules);
67fc4e0c 97
6c9692e2 98#ifdef CONFIG_MODULES_TREE_LOOKUP
106a4ee2 99
93c2e105
PZ
100/*
101 * Use a latched RB-tree for __module_address(); this allows us to use
102 * RCU-sched lookups of the address from any context.
103 *
6c9692e2
PZ
104 * This is conditional on PERF_EVENTS || TRACING because those can really hit
105 * __module_address() hard by doing a lot of stack unwinding; potentially from
106 * NMI context.
93c2e105
PZ
107 */
108
109static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n)
106a4ee2 110{
7523e4dc 111 struct module_layout *layout = container_of(n, struct module_layout, mtn.node);
106a4ee2 112
7523e4dc 113 return (unsigned long)layout->base;
93c2e105
PZ
114}
115
116static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n)
117{
7523e4dc 118 struct module_layout *layout = container_of(n, struct module_layout, mtn.node);
93c2e105 119
7523e4dc 120 return (unsigned long)layout->size;
93c2e105
PZ
121}
122
123static __always_inline bool
124mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b)
125{
126 return __mod_tree_val(a) < __mod_tree_val(b);
127}
128
129static __always_inline int
130mod_tree_comp(void *key, struct latch_tree_node *n)
131{
132 unsigned long val = (unsigned long)key;
133 unsigned long start, end;
134
135 start = __mod_tree_val(n);
136 if (val < start)
137 return -1;
138
139 end = start + __mod_tree_size(n);
140 if (val >= end)
141 return 1;
106a4ee2 142
106a4ee2
RR
143 return 0;
144}
145
93c2e105
PZ
146static const struct latch_tree_ops mod_tree_ops = {
147 .less = mod_tree_less,
148 .comp = mod_tree_comp,
149};
150
4f666546
PZ
151static struct mod_tree_root {
152 struct latch_tree_root root;
153 unsigned long addr_min;
154 unsigned long addr_max;
155} mod_tree __cacheline_aligned = {
156 .addr_min = -1UL,
106a4ee2 157};
106a4ee2 158
4f666546
PZ
159#define module_addr_min mod_tree.addr_min
160#define module_addr_max mod_tree.addr_max
161
162static noinline void __mod_tree_insert(struct mod_tree_node *node)
163{
164 latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops);
165}
166
167static void __mod_tree_remove(struct mod_tree_node *node)
168{
169 latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops);
170}
93c2e105
PZ
171
172/*
173 * These modifications: insert, remove_init and remove; are serialized by the
174 * module_mutex.
175 */
176static void mod_tree_insert(struct module *mod)
177{
7523e4dc
RR
178 mod->core_layout.mtn.mod = mod;
179 mod->init_layout.mtn.mod = mod;
93c2e105 180
7523e4dc
RR
181 __mod_tree_insert(&mod->core_layout.mtn);
182 if (mod->init_layout.size)
183 __mod_tree_insert(&mod->init_layout.mtn);
93c2e105
PZ
184}
185
186static void mod_tree_remove_init(struct module *mod)
187{
7523e4dc
RR
188 if (mod->init_layout.size)
189 __mod_tree_remove(&mod->init_layout.mtn);
93c2e105
PZ
190}
191
192static void mod_tree_remove(struct module *mod)
193{
7523e4dc 194 __mod_tree_remove(&mod->core_layout.mtn);
93c2e105
PZ
195 mod_tree_remove_init(mod);
196}
197
6c9692e2 198static struct module *mod_find(unsigned long addr)
93c2e105
PZ
199{
200 struct latch_tree_node *ltn;
201
4f666546 202 ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops);
93c2e105
PZ
203 if (!ltn)
204 return NULL;
205
206 return container_of(ltn, struct mod_tree_node, node)->mod;
207}
208
6c9692e2
PZ
209#else /* MODULES_TREE_LOOKUP */
210
4f666546
PZ
211static unsigned long module_addr_min = -1UL, module_addr_max = 0;
212
6c9692e2
PZ
213static void mod_tree_insert(struct module *mod) { }
214static void mod_tree_remove_init(struct module *mod) { }
215static void mod_tree_remove(struct module *mod) { }
216
217static struct module *mod_find(unsigned long addr)
218{
219 struct module *mod;
220
221 list_for_each_entry_rcu(mod, &modules, list) {
222 if (within_module(addr, mod))
223 return mod;
224 }
225
226 return NULL;
227}
228
229#endif /* MODULES_TREE_LOOKUP */
230
4f666546
PZ
231/*
232 * Bounds of module text, for speeding up __module_address.
233 * Protected by module_mutex.
234 */
235static void __mod_update_bounds(void *base, unsigned int size)
236{
237 unsigned long min = (unsigned long)base;
238 unsigned long max = min + size;
239
240 if (min < module_addr_min)
241 module_addr_min = min;
242 if (max > module_addr_max)
243 module_addr_max = max;
244}
245
246static void mod_update_bounds(struct module *mod)
247{
7523e4dc
RR
248 __mod_update_bounds(mod->core_layout.base, mod->core_layout.size);
249 if (mod->init_layout.size)
250 __mod_update_bounds(mod->init_layout.base, mod->init_layout.size);
4f666546
PZ
251}
252
67fc4e0c
JW
253#ifdef CONFIG_KGDB_KDB
254struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
255#endif /* CONFIG_KGDB_KDB */
256
0be964be
PZ
257static void module_assert_mutex(void)
258{
259 lockdep_assert_held(&module_mutex);
260}
261
262static void module_assert_mutex_or_preempt(void)
263{
264#ifdef CONFIG_LOCKDEP
265 if (unlikely(!debug_locks))
266 return;
267
9502514f 268 WARN_ON_ONCE(!rcu_read_lock_sched_held() &&
0be964be
PZ
269 !lockdep_is_held(&module_mutex));
270#endif
271}
272
6727bb9c
LR
273static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE);
274#ifndef CONFIG_MODULE_SIG_FORCE
106a4ee2
RR
275module_param(sig_enforce, bool_enable_only, 0644);
276#endif /* !CONFIG_MODULE_SIG_FORCE */
1da177e4 277
19e4529e
SR
278/* Block module loading/unloading? */
279int modules_disabled = 0;
02608bef 280core_param(nomodule, modules_disabled, bint, 0);
19e4529e 281
c9a3ba55
RR
282/* Waiting for a module to finish initializing? */
283static DECLARE_WAIT_QUEUE_HEAD(module_wq);
284
e041c683 285static BLOCKING_NOTIFIER_HEAD(module_notify_list);
1da177e4 286
6da0b565 287int register_module_notifier(struct notifier_block *nb)
1da177e4 288{
e041c683 289 return blocking_notifier_chain_register(&module_notify_list, nb);
1da177e4
LT
290}
291EXPORT_SYMBOL(register_module_notifier);
292
6da0b565 293int unregister_module_notifier(struct notifier_block *nb)
1da177e4 294{
e041c683 295 return blocking_notifier_chain_unregister(&module_notify_list, nb);
1da177e4
LT
296}
297EXPORT_SYMBOL(unregister_module_notifier);
298
eded41c1
RR
299struct load_info {
300 Elf_Ehdr *hdr;
301 unsigned long len;
302 Elf_Shdr *sechdrs;
6526c534 303 char *secstrings, *strtab;
d913188c 304 unsigned long symoffs, stroffs;
811d66a0
RR
305 struct _ddebug *debug;
306 unsigned int num_debug;
106a4ee2 307 bool sig_ok;
8244062e
RR
308#ifdef CONFIG_KALLSYMS
309 unsigned long mod_kallsyms_init_off;
310#endif
eded41c1
RR
311 struct {
312 unsigned int sym, str, mod, vers, info, pcpu;
313 } index;
314};
315
9a4b9708
ML
316/* We require a truly strong try_module_get(): 0 means failure due to
317 ongoing or failed initialization etc. */
1da177e4
LT
318static inline int strong_try_module_get(struct module *mod)
319{
0d21b0e3 320 BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
1da177e4 321 if (mod && mod->state == MODULE_STATE_COMING)
c9a3ba55
RR
322 return -EBUSY;
323 if (try_module_get(mod))
1da177e4 324 return 0;
c9a3ba55
RR
325 else
326 return -ENOENT;
1da177e4
LT
327}
328
373d4d09
RR
329static inline void add_taint_module(struct module *mod, unsigned flag,
330 enum lockdep_ok lockdep_ok)
fa3ba2e8 331{
373d4d09 332 add_taint(flag, lockdep_ok);
25ddbb18 333 mod->taints |= (1U << flag);
fa3ba2e8
FM
334}
335
02a3e59a
RD
336/*
337 * A thread that wants to hold a reference to a module only while it
338 * is running can call this to safely exit. nfsd and lockd use this.
1da177e4 339 */
bf262dce 340void __noreturn __module_put_and_exit(struct module *mod, long code)
1da177e4
LT
341{
342 module_put(mod);
343 do_exit(code);
344}
345EXPORT_SYMBOL(__module_put_and_exit);
22a8bdeb 346
1da177e4 347/* Find a module section: 0 means not found. */
49668688 348static unsigned int find_sec(const struct load_info *info, const char *name)
1da177e4
LT
349{
350 unsigned int i;
351
49668688
RR
352 for (i = 1; i < info->hdr->e_shnum; i++) {
353 Elf_Shdr *shdr = &info->sechdrs[i];
1da177e4 354 /* Alloc bit cleared means "ignore it." */
49668688
RR
355 if ((shdr->sh_flags & SHF_ALLOC)
356 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
1da177e4 357 return i;
49668688 358 }
1da177e4
LT
359 return 0;
360}
361
5e458cc0 362/* Find a module section, or NULL. */
49668688 363static void *section_addr(const struct load_info *info, const char *name)
5e458cc0
RR
364{
365 /* Section 0 has sh_addr 0. */
49668688 366 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
5e458cc0
RR
367}
368
369/* Find a module section, or NULL. Fill in number of "objects" in section. */
49668688 370static void *section_objs(const struct load_info *info,
5e458cc0
RR
371 const char *name,
372 size_t object_size,
373 unsigned int *num)
374{
49668688 375 unsigned int sec = find_sec(info, name);
5e458cc0
RR
376
377 /* Section 0 has sh_addr 0 and sh_size 0. */
49668688
RR
378 *num = info->sechdrs[sec].sh_size / object_size;
379 return (void *)info->sechdrs[sec].sh_addr;
5e458cc0
RR
380}
381
1da177e4
LT
382/* Provided by the linker */
383extern const struct kernel_symbol __start___ksymtab[];
384extern const struct kernel_symbol __stop___ksymtab[];
385extern const struct kernel_symbol __start___ksymtab_gpl[];
386extern const struct kernel_symbol __stop___ksymtab_gpl[];
9f28bb7e
GKH
387extern const struct kernel_symbol __start___ksymtab_gpl_future[];
388extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
1da177e4
LT
389extern const unsigned long __start___kcrctab[];
390extern const unsigned long __start___kcrctab_gpl[];
9f28bb7e 391extern const unsigned long __start___kcrctab_gpl_future[];
f7f5b675
DV
392#ifdef CONFIG_UNUSED_SYMBOLS
393extern const struct kernel_symbol __start___ksymtab_unused[];
394extern const struct kernel_symbol __stop___ksymtab_unused[];
395extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
396extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
f71d20e9
AV
397extern const unsigned long __start___kcrctab_unused[];
398extern const unsigned long __start___kcrctab_unused_gpl[];
f7f5b675 399#endif
1da177e4
LT
400
401#ifndef CONFIG_MODVERSIONS
402#define symversion(base, idx) NULL
403#else
f83ca9fe 404#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
1da177e4
LT
405#endif
406
dafd0940
RR
407static bool each_symbol_in_section(const struct symsearch *arr,
408 unsigned int arrsize,
409 struct module *owner,
410 bool (*fn)(const struct symsearch *syms,
411 struct module *owner,
de4d8d53 412 void *data),
dafd0940 413 void *data)
ad9546c9 414{
de4d8d53 415 unsigned int j;
ad9546c9 416
dafd0940 417 for (j = 0; j < arrsize; j++) {
de4d8d53
RR
418 if (fn(&arr[j], owner, data))
419 return true;
f71d20e9 420 }
dafd0940
RR
421
422 return false;
ad9546c9
RR
423}
424
dafd0940 425/* Returns true as soon as fn returns true, otherwise false. */
de4d8d53
RR
426bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
427 struct module *owner,
428 void *data),
429 void *data)
ad9546c9
RR
430{
431 struct module *mod;
44032e63 432 static const struct symsearch arr[] = {
ad9546c9 433 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
dafd0940 434 NOT_GPL_ONLY, false },
ad9546c9 435 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
dafd0940
RR
436 __start___kcrctab_gpl,
437 GPL_ONLY, false },
ad9546c9 438 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
dafd0940
RR
439 __start___kcrctab_gpl_future,
440 WILL_BE_GPL_ONLY, false },
f7f5b675 441#ifdef CONFIG_UNUSED_SYMBOLS
ad9546c9 442 { __start___ksymtab_unused, __stop___ksymtab_unused,
dafd0940
RR
443 __start___kcrctab_unused,
444 NOT_GPL_ONLY, true },
ad9546c9 445 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
dafd0940
RR
446 __start___kcrctab_unused_gpl,
447 GPL_ONLY, true },
f7f5b675 448#endif
ad9546c9 449 };
f71d20e9 450
0be964be
PZ
451 module_assert_mutex_or_preempt();
452
dafd0940
RR
453 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
454 return true;
f71d20e9 455
d72b3751 456 list_for_each_entry_rcu(mod, &modules, list) {
ad9546c9
RR
457 struct symsearch arr[] = {
458 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
dafd0940 459 NOT_GPL_ONLY, false },
ad9546c9 460 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
dafd0940
RR
461 mod->gpl_crcs,
462 GPL_ONLY, false },
ad9546c9
RR
463 { mod->gpl_future_syms,
464 mod->gpl_future_syms + mod->num_gpl_future_syms,
dafd0940
RR
465 mod->gpl_future_crcs,
466 WILL_BE_GPL_ONLY, false },
f7f5b675 467#ifdef CONFIG_UNUSED_SYMBOLS
ad9546c9
RR
468 { mod->unused_syms,
469 mod->unused_syms + mod->num_unused_syms,
dafd0940
RR
470 mod->unused_crcs,
471 NOT_GPL_ONLY, true },
ad9546c9
RR
472 { mod->unused_gpl_syms,
473 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
dafd0940
RR
474 mod->unused_gpl_crcs,
475 GPL_ONLY, true },
f7f5b675 476#endif
ad9546c9
RR
477 };
478
0d21b0e3
RR
479 if (mod->state == MODULE_STATE_UNFORMED)
480 continue;
481
dafd0940
RR
482 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
483 return true;
484 }
485 return false;
486}
de4d8d53 487EXPORT_SYMBOL_GPL(each_symbol_section);
dafd0940
RR
488
489struct find_symbol_arg {
490 /* Input */
491 const char *name;
492 bool gplok;
493 bool warn;
494
495 /* Output */
496 struct module *owner;
497 const unsigned long *crc;
414fd31b 498 const struct kernel_symbol *sym;
dafd0940
RR
499};
500
de4d8d53
RR
501static bool check_symbol(const struct symsearch *syms,
502 struct module *owner,
503 unsigned int symnum, void *data)
dafd0940
RR
504{
505 struct find_symbol_arg *fsa = data;
506
dafd0940
RR
507 if (!fsa->gplok) {
508 if (syms->licence == GPL_ONLY)
509 return false;
510 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
bddb12b3
AM
511 pr_warn("Symbol %s is being used by a non-GPL module, "
512 "which will not be allowed in the future\n",
513 fsa->name);
9f28bb7e 514 }
1da177e4 515 }
ad9546c9 516
f7f5b675 517#ifdef CONFIG_UNUSED_SYMBOLS
dafd0940 518 if (syms->unused && fsa->warn) {
bddb12b3
AM
519 pr_warn("Symbol %s is marked as UNUSED, however this module is "
520 "using it.\n", fsa->name);
521 pr_warn("This symbol will go away in the future.\n");
7b63c3ab
YG
522 pr_warn("Please evaluate if this is the right api to use and "
523 "if it really is, submit a report to the linux kernel "
524 "mailing list together with submitting your code for "
bddb12b3 525 "inclusion.\n");
dafd0940 526 }
f7f5b675 527#endif
dafd0940
RR
528
529 fsa->owner = owner;
530 fsa->crc = symversion(syms->crcs, symnum);
414fd31b 531 fsa->sym = &syms->start[symnum];
dafd0940
RR
532 return true;
533}
534
403ed278
AIB
535static int cmp_name(const void *va, const void *vb)
536{
537 const char *a;
538 const struct kernel_symbol *b;
539 a = va; b = vb;
540 return strcmp(a, b->name);
541}
542
de4d8d53
RR
543static bool find_symbol_in_section(const struct symsearch *syms,
544 struct module *owner,
545 void *data)
546{
547 struct find_symbol_arg *fsa = data;
403ed278
AIB
548 struct kernel_symbol *sym;
549
550 sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
551 sizeof(struct kernel_symbol), cmp_name);
552
553 if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
554 return true;
de4d8d53 555
de4d8d53
RR
556 return false;
557}
558
414fd31b 559/* Find a symbol and return it, along with, (optional) crc and
75676500 560 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
c6b37801
TA
561const struct kernel_symbol *find_symbol(const char *name,
562 struct module **owner,
563 const unsigned long **crc,
564 bool gplok,
565 bool warn)
dafd0940
RR
566{
567 struct find_symbol_arg fsa;
568
569 fsa.name = name;
570 fsa.gplok = gplok;
571 fsa.warn = warn;
572
de4d8d53 573 if (each_symbol_section(find_symbol_in_section, &fsa)) {
dafd0940
RR
574 if (owner)
575 *owner = fsa.owner;
576 if (crc)
577 *crc = fsa.crc;
414fd31b 578 return fsa.sym;
dafd0940
RR
579 }
580
5e124169 581 pr_debug("Failed to find symbol %s\n", name);
414fd31b 582 return NULL;
1da177e4 583}
c6b37801 584EXPORT_SYMBOL_GPL(find_symbol);
1da177e4 585
fe0d34d2
RR
586/*
587 * Search for module by name: must hold module_mutex (or preempt disabled
588 * for read-only access).
589 */
4f6de4d5 590static struct module *find_module_all(const char *name, size_t len,
0d21b0e3 591 bool even_unformed)
1da177e4
LT
592{
593 struct module *mod;
594
fe0d34d2 595 module_assert_mutex_or_preempt();
0be964be 596
1da177e4 597 list_for_each_entry(mod, &modules, list) {
0d21b0e3
RR
598 if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
599 continue;
4f6de4d5 600 if (strlen(mod->name) == len && !memcmp(mod->name, name, len))
1da177e4
LT
601 return mod;
602 }
603 return NULL;
604}
0d21b0e3
RR
605
606struct module *find_module(const char *name)
607{
fe0d34d2 608 module_assert_mutex();
4f6de4d5 609 return find_module_all(name, strlen(name), false);
0d21b0e3 610}
c6b37801 611EXPORT_SYMBOL_GPL(find_module);
1da177e4
LT
612
613#ifdef CONFIG_SMP
fbf59bc9 614
259354de 615static inline void __percpu *mod_percpu(struct module *mod)
fbf59bc9 616{
259354de
TH
617 return mod->percpu;
618}
fbf59bc9 619
9eb76d77 620static int percpu_modalloc(struct module *mod, struct load_info *info)
259354de 621{
9eb76d77
RR
622 Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu];
623 unsigned long align = pcpusec->sh_addralign;
624
625 if (!pcpusec->sh_size)
626 return 0;
627
fbf59bc9 628 if (align > PAGE_SIZE) {
bddb12b3
AM
629 pr_warn("%s: per-cpu alignment %li > %li\n",
630 mod->name, align, PAGE_SIZE);
fbf59bc9
TH
631 align = PAGE_SIZE;
632 }
633
9eb76d77 634 mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align);
259354de 635 if (!mod->percpu) {
bddb12b3
AM
636 pr_warn("%s: Could not allocate %lu bytes percpu data\n",
637 mod->name, (unsigned long)pcpusec->sh_size);
259354de
TH
638 return -ENOMEM;
639 }
9eb76d77 640 mod->percpu_size = pcpusec->sh_size;
259354de 641 return 0;
fbf59bc9
TH
642}
643
259354de 644static void percpu_modfree(struct module *mod)
fbf59bc9 645{
259354de 646 free_percpu(mod->percpu);
fbf59bc9
TH
647}
648
49668688 649static unsigned int find_pcpusec(struct load_info *info)
6b588c18 650{
49668688 651 return find_sec(info, ".data..percpu");
6b588c18
TH
652}
653
259354de
TH
654static void percpu_modcopy(struct module *mod,
655 const void *from, unsigned long size)
6b588c18
TH
656{
657 int cpu;
658
659 for_each_possible_cpu(cpu)
259354de 660 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
6b588c18
TH
661}
662
10fad5e4
TH
663/**
664 * is_module_percpu_address - test whether address is from module static percpu
665 * @addr: address to test
666 *
667 * Test whether @addr belongs to module static percpu area.
668 *
669 * RETURNS:
670 * %true if @addr is from module static percpu area
671 */
672bool is_module_percpu_address(unsigned long addr)
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);
686
687 if ((void *)addr >= start &&
688 (void *)addr < start + mod->percpu_size) {
689 preempt_enable();
690 return true;
691 }
692 }
693 }
694
695 preempt_enable();
696 return false;
6b588c18
TH
697}
698
1da177e4 699#else /* ... !CONFIG_SMP */
6b588c18 700
259354de 701static inline void __percpu *mod_percpu(struct module *mod)
1da177e4
LT
702{
703 return NULL;
704}
9eb76d77 705static int percpu_modalloc(struct module *mod, struct load_info *info)
259354de 706{
9eb76d77
RR
707 /* UP modules shouldn't have this section: ENOMEM isn't quite right */
708 if (info->sechdrs[info->index.pcpu].sh_size != 0)
709 return -ENOMEM;
710 return 0;
259354de
TH
711}
712static inline void percpu_modfree(struct module *mod)
1da177e4 713{
1da177e4 714}
49668688 715static unsigned int find_pcpusec(struct load_info *info)
1da177e4
LT
716{
717 return 0;
718}
259354de
TH
719static inline void percpu_modcopy(struct module *mod,
720 const void *from, unsigned long size)
1da177e4
LT
721{
722 /* pcpusec should be 0, and size of that section should be 0. */
723 BUG_ON(size != 0);
724}
10fad5e4
TH
725bool is_module_percpu_address(unsigned long addr)
726{
727 return false;
728}
6b588c18 729
1da177e4
LT
730#endif /* CONFIG_SMP */
731
c988d2b2
MD
732#define MODINFO_ATTR(field) \
733static void setup_modinfo_##field(struct module *mod, const char *s) \
734{ \
735 mod->field = kstrdup(s, GFP_KERNEL); \
736} \
737static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
4befb026 738 struct module_kobject *mk, char *buffer) \
c988d2b2 739{ \
cc56ded3 740 return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
c988d2b2
MD
741} \
742static int modinfo_##field##_exists(struct module *mod) \
743{ \
744 return mod->field != NULL; \
745} \
746static void free_modinfo_##field(struct module *mod) \
747{ \
22a8bdeb
DW
748 kfree(mod->field); \
749 mod->field = NULL; \
c988d2b2
MD
750} \
751static struct module_attribute modinfo_##field = { \
7b595756 752 .attr = { .name = __stringify(field), .mode = 0444 }, \
c988d2b2
MD
753 .show = show_modinfo_##field, \
754 .setup = setup_modinfo_##field, \
755 .test = modinfo_##field##_exists, \
756 .free = free_modinfo_##field, \
757};
758
759MODINFO_ATTR(version);
760MODINFO_ATTR(srcversion);
761
e14af7ee
AV
762static char last_unloaded_module[MODULE_NAME_LEN+1];
763
03e88ae1 764#ifdef CONFIG_MODULE_UNLOAD
eb0c5377
SR
765
766EXPORT_TRACEPOINT_SYMBOL(module_get);
767
e513cc1c
MH
768/* MODULE_REF_BASE is the base reference count by kmodule loader. */
769#define MODULE_REF_BASE 1
770
1da177e4 771/* Init the unload section of the module. */
9f85a4bb 772static int module_unload_init(struct module *mod)
1da177e4 773{
e513cc1c
MH
774 /*
775 * Initialize reference counter to MODULE_REF_BASE.
776 * refcnt == 0 means module is going.
777 */
778 atomic_set(&mod->refcnt, MODULE_REF_BASE);
9f85a4bb 779
2c02dfe7
LT
780 INIT_LIST_HEAD(&mod->source_list);
781 INIT_LIST_HEAD(&mod->target_list);
e1783a24 782
1da177e4 783 /* Hold reference count during initialization. */
e513cc1c 784 atomic_inc(&mod->refcnt);
9f85a4bb
RR
785
786 return 0;
1da177e4
LT
787}
788
1da177e4
LT
789/* Does a already use b? */
790static int already_uses(struct module *a, struct module *b)
791{
792 struct module_use *use;
793
2c02dfe7
LT
794 list_for_each_entry(use, &b->source_list, source_list) {
795 if (use->source == a) {
5e124169 796 pr_debug("%s uses %s!\n", a->name, b->name);
1da177e4
LT
797 return 1;
798 }
799 }
5e124169 800 pr_debug("%s does not use %s!\n", a->name, b->name);
1da177e4
LT
801 return 0;
802}
803
2c02dfe7
LT
804/*
805 * Module a uses b
806 * - we add 'a' as a "source", 'b' as a "target" of module use
807 * - the module_use is added to the list of 'b' sources (so
808 * 'b' can walk the list to see who sourced them), and of 'a'
809 * targets (so 'a' can see what modules it targets).
810 */
811static int add_module_usage(struct module *a, struct module *b)
812{
2c02dfe7
LT
813 struct module_use *use;
814
5e124169 815 pr_debug("Allocating new usage for %s.\n", a->name);
2c02dfe7
LT
816 use = kmalloc(sizeof(*use), GFP_ATOMIC);
817 if (!use) {
bddb12b3 818 pr_warn("%s: out of memory loading\n", a->name);
2c02dfe7
LT
819 return -ENOMEM;
820 }
821
822 use->source = a;
823 use->target = b;
824 list_add(&use->source_list, &b->source_list);
825 list_add(&use->target_list, &a->target_list);
2c02dfe7
LT
826 return 0;
827}
828
75676500 829/* Module a uses b: caller needs module_mutex() */
9bea7f23 830int ref_module(struct module *a, struct module *b)
1da177e4 831{
c8e21ced 832 int err;
270a6c4c 833
9bea7f23 834 if (b == NULL || already_uses(a, b))
218ce735 835 return 0;
218ce735 836
9bea7f23
RR
837 /* If module isn't available, we fail. */
838 err = strong_try_module_get(b);
c9a3ba55 839 if (err)
9bea7f23 840 return err;
1da177e4 841
2c02dfe7
LT
842 err = add_module_usage(a, b);
843 if (err) {
1da177e4 844 module_put(b);
9bea7f23 845 return err;
1da177e4 846 }
9bea7f23 847 return 0;
1da177e4 848}
9bea7f23 849EXPORT_SYMBOL_GPL(ref_module);
1da177e4
LT
850
851/* Clear the unload stuff of the module. */
852static void module_unload_free(struct module *mod)
853{
2c02dfe7 854 struct module_use *use, *tmp;
1da177e4 855
75676500 856 mutex_lock(&module_mutex);
2c02dfe7
LT
857 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
858 struct module *i = use->target;
5e124169 859 pr_debug("%s unusing %s\n", mod->name, i->name);
2c02dfe7
LT
860 module_put(i);
861 list_del(&use->source_list);
862 list_del(&use->target_list);
863 kfree(use);
1da177e4 864 }
75676500 865 mutex_unlock(&module_mutex);
1da177e4
LT
866}
867
868#ifdef CONFIG_MODULE_FORCE_UNLOAD
fb169793 869static inline int try_force_unload(unsigned int flags)
1da177e4
LT
870{
871 int ret = (flags & O_TRUNC);
872 if (ret)
373d4d09 873 add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE);
1da177e4
LT
874 return ret;
875}
876#else
fb169793 877static inline int try_force_unload(unsigned int flags)
1da177e4
LT
878{
879 return 0;
880}
881#endif /* CONFIG_MODULE_FORCE_UNLOAD */
882
e513cc1c
MH
883/* Try to release refcount of module, 0 means success. */
884static int try_release_module_ref(struct module *mod)
1da177e4 885{
e513cc1c 886 int ret;
1da177e4 887
e513cc1c
MH
888 /* Try to decrement refcnt which we set at loading */
889 ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt);
890 BUG_ON(ret < 0);
891 if (ret)
892 /* Someone can put this right now, recover with checking */
893 ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0);
1da177e4 894
e513cc1c
MH
895 return ret;
896}
1da177e4 897
e513cc1c
MH
898static int try_stop_module(struct module *mod, int flags, int *forced)
899{
da39ba5e 900 /* If it's not unused, quit unless we're forcing. */
e513cc1c
MH
901 if (try_release_module_ref(mod) != 0) {
902 *forced = try_force_unload(flags);
903 if (!(*forced))
1da177e4
LT
904 return -EWOULDBLOCK;
905 }
906
907 /* Mark it as dying. */
e513cc1c 908 mod->state = MODULE_STATE_GOING;
1da177e4 909
e513cc1c 910 return 0;
1da177e4
LT
911}
912
d5db139a
RR
913/**
914 * module_refcount - return the refcount or -1 if unloading
915 *
916 * @mod: the module we're checking
917 *
918 * Returns:
919 * -1 if the module is in the process of unloading
920 * otherwise the number of references in the kernel to the module
921 */
922int module_refcount(struct module *mod)
1da177e4 923{
d5db139a 924 return atomic_read(&mod->refcnt) - MODULE_REF_BASE;
1da177e4
LT
925}
926EXPORT_SYMBOL(module_refcount);
927
928/* This exists whether we can unload or not */
929static void free_module(struct module *mod);
930
17da2bd9
HC
931SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
932 unsigned int, flags)
1da177e4
LT
933{
934 struct module *mod;
dfff0a06 935 char name[MODULE_NAME_LEN];
1da177e4
LT
936 int ret, forced = 0;
937
3d43321b 938 if (!capable(CAP_SYS_MODULE) || modules_disabled)
dfff0a06
GKH
939 return -EPERM;
940
941 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
942 return -EFAULT;
943 name[MODULE_NAME_LEN-1] = '\0';
944
3fc1f1e2
TH
945 if (mutex_lock_interruptible(&module_mutex) != 0)
946 return -EINTR;
1da177e4
LT
947
948 mod = find_module(name);
949 if (!mod) {
950 ret = -ENOENT;
951 goto out;
952 }
953
2c02dfe7 954 if (!list_empty(&mod->source_list)) {
1da177e4
LT
955 /* Other modules depend on us: get rid of them first. */
956 ret = -EWOULDBLOCK;
957 goto out;
958 }
959
960 /* Doing init or already dying? */
961 if (mod->state != MODULE_STATE_LIVE) {
3f2b9c9c 962 /* FIXME: if (force), slam module count damn the torpedoes */
5e124169 963 pr_debug("%s already dying\n", mod->name);
1da177e4
LT
964 ret = -EBUSY;
965 goto out;
966 }
967
968 /* If it has an init func, it must have an exit func to unload */
af49d924 969 if (mod->init && !mod->exit) {
fb169793 970 forced = try_force_unload(flags);
1da177e4
LT
971 if (!forced) {
972 /* This module can't be removed */
973 ret = -EBUSY;
974 goto out;
975 }
976 }
977
1da177e4
LT
978 /* Stop the machine so refcounts can't move and disable module. */
979 ret = try_stop_module(mod, flags, &forced);
980 if (ret != 0)
981 goto out;
982
df4b565e 983 mutex_unlock(&module_mutex);
25985edc 984 /* Final destruction now no one is using it. */
df4b565e 985 if (mod->exit != NULL)
1da177e4 986 mod->exit();
df4b565e
PO
987 blocking_notifier_call_chain(&module_notify_list,
988 MODULE_STATE_GOING, mod);
7e545d6e 989 klp_module_going(mod);
7dcd182b
JY
990 ftrace_release_mod(mod);
991
22a9d645 992 async_synchronize_full();
75676500 993
e14af7ee 994 /* Store the name of the last unloaded module for diagnostic purposes */
efa5345e 995 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
1da177e4 996
75676500
RR
997 free_module(mod);
998 return 0;
999out:
6389a385 1000 mutex_unlock(&module_mutex);
1da177e4
LT
1001 return ret;
1002}
1003
d1e99d7a 1004static inline void print_unload_info(struct seq_file *m, struct module *mod)
1da177e4
LT
1005{
1006 struct module_use *use;
1007 int printed_something = 0;
1008
d5db139a 1009 seq_printf(m, " %i ", module_refcount(mod));
1da177e4 1010
6da0b565
IA
1011 /*
1012 * Always include a trailing , so userspace can differentiate
1013 * between this and the old multi-field proc format.
1014 */
2c02dfe7 1015 list_for_each_entry(use, &mod->source_list, source_list) {
1da177e4 1016 printed_something = 1;
2c02dfe7 1017 seq_printf(m, "%s,", use->source->name);
1da177e4
LT
1018 }
1019
1da177e4
LT
1020 if (mod->init != NULL && mod->exit == NULL) {
1021 printed_something = 1;
6da0b565 1022 seq_puts(m, "[permanent],");
1da177e4
LT
1023 }
1024
1025 if (!printed_something)
6da0b565 1026 seq_puts(m, "-");
1da177e4
LT
1027}
1028
1029void __symbol_put(const char *symbol)
1030{
1031 struct module *owner;
1da177e4 1032
24da1cbf 1033 preempt_disable();
414fd31b 1034 if (!find_symbol(symbol, &owner, NULL, true, false))
1da177e4
LT
1035 BUG();
1036 module_put(owner);
24da1cbf 1037 preempt_enable();
1da177e4
LT
1038}
1039EXPORT_SYMBOL(__symbol_put);
1040
7d1d16e4 1041/* Note this assumes addr is a function, which it currently always is. */
1da177e4
LT
1042void symbol_put_addr(void *addr)
1043{
5e376613 1044 struct module *modaddr;
7d1d16e4 1045 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
1da177e4 1046
7d1d16e4 1047 if (core_kernel_text(a))
5e376613 1048 return;
1da177e4 1049
275d7d44
PZ
1050 /*
1051 * Even though we hold a reference on the module; we still need to
1052 * disable preemption in order to safely traverse the data structure.
1053 */
1054 preempt_disable();
7d1d16e4 1055 modaddr = __module_text_address(a);
a6e6abd5 1056 BUG_ON(!modaddr);
5e376613 1057 module_put(modaddr);
275d7d44 1058 preempt_enable();
1da177e4
LT
1059}
1060EXPORT_SYMBOL_GPL(symbol_put_addr);
1061
1062static ssize_t show_refcnt(struct module_attribute *mattr,
4befb026 1063 struct module_kobject *mk, char *buffer)
1da177e4 1064{
d5db139a 1065 return sprintf(buffer, "%i\n", module_refcount(mk->mod));
1da177e4
LT
1066}
1067
cca3e707
KS
1068static struct module_attribute modinfo_refcnt =
1069 __ATTR(refcnt, 0444, show_refcnt, NULL);
1da177e4 1070
d53799be
SR
1071void __module_get(struct module *module)
1072{
1073 if (module) {
1074 preempt_disable();
2f35c41f 1075 atomic_inc(&module->refcnt);
d53799be
SR
1076 trace_module_get(module, _RET_IP_);
1077 preempt_enable();
1078 }
1079}
1080EXPORT_SYMBOL(__module_get);
1081
1082bool try_module_get(struct module *module)
1083{
1084 bool ret = true;
1085
1086 if (module) {
1087 preempt_disable();
e513cc1c
MH
1088 /* Note: here, we can fail to get a reference */
1089 if (likely(module_is_live(module) &&
1090 atomic_inc_not_zero(&module->refcnt) != 0))
d53799be 1091 trace_module_get(module, _RET_IP_);
e513cc1c 1092 else
d53799be
SR
1093 ret = false;
1094
1095 preempt_enable();
1096 }
1097 return ret;
1098}
1099EXPORT_SYMBOL(try_module_get);
1100
f6a57033
AV
1101void module_put(struct module *module)
1102{
e513cc1c
MH
1103 int ret;
1104
f6a57033 1105 if (module) {
e1783a24 1106 preempt_disable();
e513cc1c
MH
1107 ret = atomic_dec_if_positive(&module->refcnt);
1108 WARN_ON(ret < 0); /* Failed to put refcount */
ae832d1e 1109 trace_module_put(module, _RET_IP_);
e1783a24 1110 preempt_enable();
f6a57033
AV
1111 }
1112}
1113EXPORT_SYMBOL(module_put);
1114
1da177e4 1115#else /* !CONFIG_MODULE_UNLOAD */
d1e99d7a 1116static inline void print_unload_info(struct seq_file *m, struct module *mod)
1da177e4
LT
1117{
1118 /* We don't know the usage count, or what modules are using. */
6da0b565 1119 seq_puts(m, " - -");
1da177e4
LT
1120}
1121
1122static inline void module_unload_free(struct module *mod)
1123{
1124}
1125
9bea7f23 1126int ref_module(struct module *a, struct module *b)
1da177e4 1127{
9bea7f23 1128 return strong_try_module_get(b);
1da177e4 1129}
9bea7f23 1130EXPORT_SYMBOL_GPL(ref_module);
1da177e4 1131
9f85a4bb 1132static inline int module_unload_init(struct module *mod)
1da177e4 1133{
9f85a4bb 1134 return 0;
1da177e4
LT
1135}
1136#endif /* CONFIG_MODULE_UNLOAD */
1137
53999bf3
KW
1138static size_t module_flags_taint(struct module *mod, char *buf)
1139{
1140 size_t l = 0;
1141
1142 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
1143 buf[l++] = 'P';
1144 if (mod->taints & (1 << TAINT_OOT_MODULE))
1145 buf[l++] = 'O';
1146 if (mod->taints & (1 << TAINT_FORCED_MODULE))
1147 buf[l++] = 'F';
1148 if (mod->taints & (1 << TAINT_CRAP))
1149 buf[l++] = 'C';
66cc69e3 1150 if (mod->taints & (1 << TAINT_UNSIGNED_MODULE))
57673c2b 1151 buf[l++] = 'E';
2992ef29
JP
1152 if (mod->taints & (1 << TAINT_LIVEPATCH))
1153 buf[l++] = 'K';
53999bf3
KW
1154 /*
1155 * TAINT_FORCED_RMMOD: could be added.
8c90487c 1156 * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
53999bf3
KW
1157 * apply to modules.
1158 */
1159 return l;
1160}
1161
1f71740a 1162static ssize_t show_initstate(struct module_attribute *mattr,
4befb026 1163 struct module_kobject *mk, char *buffer)
1f71740a
KS
1164{
1165 const char *state = "unknown";
1166
4befb026 1167 switch (mk->mod->state) {
1f71740a
KS
1168 case MODULE_STATE_LIVE:
1169 state = "live";
1170 break;
1171 case MODULE_STATE_COMING:
1172 state = "coming";
1173 break;
1174 case MODULE_STATE_GOING:
1175 state = "going";
1176 break;
0d21b0e3
RR
1177 default:
1178 BUG();
1f71740a
KS
1179 }
1180 return sprintf(buffer, "%s\n", state);
1181}
1182
cca3e707
KS
1183static struct module_attribute modinfo_initstate =
1184 __ATTR(initstate, 0444, show_initstate, NULL);
1f71740a 1185
88bfa324
KS
1186static ssize_t store_uevent(struct module_attribute *mattr,
1187 struct module_kobject *mk,
1188 const char *buffer, size_t count)
1189{
1190 enum kobject_action action;
1191
1192 if (kobject_action_type(buffer, count, &action) == 0)
1193 kobject_uevent(&mk->kobj, action);
1194 return count;
1195}
1196
cca3e707
KS
1197struct module_attribute module_uevent =
1198 __ATTR(uevent, 0200, NULL, store_uevent);
1199
1200static ssize_t show_coresize(struct module_attribute *mattr,
1201 struct module_kobject *mk, char *buffer)
1202{
7523e4dc 1203 return sprintf(buffer, "%u\n", mk->mod->core_layout.size);
cca3e707
KS
1204}
1205
1206static struct module_attribute modinfo_coresize =
1207 __ATTR(coresize, 0444, show_coresize, NULL);
1208
1209static ssize_t show_initsize(struct module_attribute *mattr,
1210 struct module_kobject *mk, char *buffer)
1211{
7523e4dc 1212 return sprintf(buffer, "%u\n", mk->mod->init_layout.size);
cca3e707
KS
1213}
1214
1215static struct module_attribute modinfo_initsize =
1216 __ATTR(initsize, 0444, show_initsize, NULL);
1217
1218static ssize_t show_taint(struct module_attribute *mattr,
1219 struct module_kobject *mk, char *buffer)
1220{
1221 size_t l;
1222
1223 l = module_flags_taint(mk->mod, buffer);
1224 buffer[l++] = '\n';
1225 return l;
1226}
1227
1228static struct module_attribute modinfo_taint =
1229 __ATTR(taint, 0444, show_taint, NULL);
88bfa324 1230
03e88ae1 1231static struct module_attribute *modinfo_attrs[] = {
cca3e707 1232 &module_uevent,
03e88ae1
GKH
1233 &modinfo_version,
1234 &modinfo_srcversion,
cca3e707
KS
1235 &modinfo_initstate,
1236 &modinfo_coresize,
1237 &modinfo_initsize,
1238 &modinfo_taint,
03e88ae1 1239#ifdef CONFIG_MODULE_UNLOAD
cca3e707 1240 &modinfo_refcnt,
03e88ae1
GKH
1241#endif
1242 NULL,
1243};
1244
1da177e4
LT
1245static const char vermagic[] = VERMAGIC_STRING;
1246
c6e665c8 1247static int try_to_force_load(struct module *mod, const char *reason)
826e4506
LT
1248{
1249#ifdef CONFIG_MODULE_FORCE_LOAD
25ddbb18 1250 if (!test_taint(TAINT_FORCED_MODULE))
bddb12b3 1251 pr_warn("%s: %s: kernel tainted.\n", mod->name, reason);
373d4d09 1252 add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE);
826e4506
LT
1253 return 0;
1254#else
1255 return -ENOEXEC;
1256#endif
1257}
1258
1da177e4 1259#ifdef CONFIG_MODVERSIONS
d4703aef
RR
1260/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1261static unsigned long maybe_relocated(unsigned long crc,
1262 const struct module *crc_owner)
1263{
1264#ifdef ARCH_RELOCATES_KCRCTAB
1265 if (crc_owner == NULL)
1266 return crc - (unsigned long)reloc_start;
1267#endif
1268 return crc;
1269}
1270
1da177e4
LT
1271static int check_version(Elf_Shdr *sechdrs,
1272 unsigned int versindex,
1273 const char *symname,
6da0b565 1274 struct module *mod,
d4703aef
RR
1275 const unsigned long *crc,
1276 const struct module *crc_owner)
1da177e4
LT
1277{
1278 unsigned int i, num_versions;
1279 struct modversion_info *versions;
1280
1281 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1282 if (!crc)
1283 return 1;
1284
a5dd6970
RR
1285 /* No versions at all? modprobe --force does this. */
1286 if (versindex == 0)
1287 return try_to_force_load(mod, symname) == 0;
1288
1da177e4
LT
1289 versions = (void *) sechdrs[versindex].sh_addr;
1290 num_versions = sechdrs[versindex].sh_size
1291 / sizeof(struct modversion_info);
1292
1293 for (i = 0; i < num_versions; i++) {
1294 if (strcmp(versions[i].name, symname) != 0)
1295 continue;
1296
d4703aef 1297 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
1da177e4 1298 return 1;
5e124169 1299 pr_debug("Found checksum %lX vs module %lX\n",
d4703aef 1300 maybe_relocated(*crc, crc_owner), versions[i].crc);
826e4506 1301 goto bad_version;
1da177e4 1302 }
826e4506 1303
bddb12b3 1304 pr_warn("%s: no symbol version for %s\n", mod->name, symname);
a5dd6970 1305 return 0;
826e4506
LT
1306
1307bad_version:
6da0b565 1308 pr_warn("%s: disagrees about version of symbol %s\n",
826e4506
LT
1309 mod->name, symname);
1310 return 0;
1da177e4
LT
1311}
1312
1313static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1314 unsigned int versindex,
1315 struct module *mod)
1316{
1317 const unsigned long *crc;
1da177e4 1318
926a59b1
PZ
1319 /*
1320 * Since this should be found in kernel (which can't be removed), no
1321 * locking is necessary -- use preempt_disable() to placate lockdep.
1322 */
1323 preempt_disable();
b92021b0 1324 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL,
926a59b1
PZ
1325 &crc, true, false)) {
1326 preempt_enable();
1da177e4 1327 BUG();
926a59b1
PZ
1328 }
1329 preempt_enable();
a4b6a77b
JH
1330 return check_version(sechdrs, versindex,
1331 VMLINUX_SYMBOL_STR(module_layout), mod, crc,
d4703aef 1332 NULL);
1da177e4
LT
1333}
1334
91e37a79
RR
1335/* First part is kernel version, which we ignore if module has crcs. */
1336static inline int same_magic(const char *amagic, const char *bmagic,
1337 bool has_crcs)
1da177e4 1338{
91e37a79
RR
1339 if (has_crcs) {
1340 amagic += strcspn(amagic, " ");
1341 bmagic += strcspn(bmagic, " ");
1342 }
1da177e4
LT
1343 return strcmp(amagic, bmagic) == 0;
1344}
1345#else
1346static inline int check_version(Elf_Shdr *sechdrs,
1347 unsigned int versindex,
1348 const char *symname,
6da0b565 1349 struct module *mod,
d4703aef
RR
1350 const unsigned long *crc,
1351 const struct module *crc_owner)
1da177e4
LT
1352{
1353 return 1;
1354}
1355
1356static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1357 unsigned int versindex,
1358 struct module *mod)
1359{
1360 return 1;
1361}
1362
91e37a79
RR
1363static inline int same_magic(const char *amagic, const char *bmagic,
1364 bool has_crcs)
1da177e4
LT
1365{
1366 return strcmp(amagic, bmagic) == 0;
1367}
1368#endif /* CONFIG_MODVERSIONS */
1369
75676500 1370/* Resolve a symbol for this module. I.e. if we find one, record usage. */
49668688
RR
1371static const struct kernel_symbol *resolve_symbol(struct module *mod,
1372 const struct load_info *info,
414fd31b 1373 const char *name,
9bea7f23 1374 char ownername[])
1da177e4
LT
1375{
1376 struct module *owner;
414fd31b 1377 const struct kernel_symbol *sym;
1da177e4 1378 const unsigned long *crc;
9bea7f23 1379 int err;
1da177e4 1380
d64810f5
PZ
1381 /*
1382 * The module_mutex should not be a heavily contended lock;
1383 * if we get the occasional sleep here, we'll go an extra iteration
1384 * in the wait_event_interruptible(), which is harmless.
1385 */
1386 sched_annotate_sleep();
75676500 1387 mutex_lock(&module_mutex);
414fd31b 1388 sym = find_symbol(name, &owner, &crc,
25ddbb18 1389 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
9bea7f23
RR
1390 if (!sym)
1391 goto unlock;
1392
49668688
RR
1393 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1394 owner)) {
9bea7f23
RR
1395 sym = ERR_PTR(-EINVAL);
1396 goto getname;
1da177e4 1397 }
9bea7f23
RR
1398
1399 err = ref_module(mod, owner);
1400 if (err) {
1401 sym = ERR_PTR(err);
1402 goto getname;
1403 }
1404
1405getname:
1406 /* We must make copy under the lock if we failed to get ref. */
1407 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1408unlock:
75676500 1409 mutex_unlock(&module_mutex);
218ce735 1410 return sym;
1da177e4
LT
1411}
1412
49668688
RR
1413static const struct kernel_symbol *
1414resolve_symbol_wait(struct module *mod,
1415 const struct load_info *info,
1416 const char *name)
9bea7f23
RR
1417{
1418 const struct kernel_symbol *ksym;
49668688 1419 char owner[MODULE_NAME_LEN];
9bea7f23
RR
1420
1421 if (wait_event_interruptible_timeout(module_wq,
49668688
RR
1422 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1423 || PTR_ERR(ksym) != -EBUSY,
9bea7f23 1424 30 * HZ) <= 0) {
bddb12b3
AM
1425 pr_warn("%s: gave up waiting for init of module %s.\n",
1426 mod->name, owner);
9bea7f23
RR
1427 }
1428 return ksym;
1429}
1430
1da177e4
LT
1431/*
1432 * /sys/module/foo/sections stuff
1433 * J. Corbet <corbet@lwn.net>
1434 */
8f6d0378 1435#ifdef CONFIG_SYSFS
10b465aa 1436
8f6d0378 1437#ifdef CONFIG_KALLSYMS
10b465aa
BH
1438static inline bool sect_empty(const Elf_Shdr *sect)
1439{
1440 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1441}
1442
6da0b565 1443struct module_sect_attr {
a58730c4
RR
1444 struct module_attribute mattr;
1445 char *name;
1446 unsigned long address;
1447};
1448
6da0b565 1449struct module_sect_attrs {
a58730c4
RR
1450 struct attribute_group grp;
1451 unsigned int nsections;
1452 struct module_sect_attr attrs[0];
1453};
1454
1da177e4 1455static ssize_t module_sect_show(struct module_attribute *mattr,
4befb026 1456 struct module_kobject *mk, char *buf)
1da177e4
LT
1457{
1458 struct module_sect_attr *sattr =
1459 container_of(mattr, struct module_sect_attr, mattr);
9f36e2c4 1460 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
1da177e4
LT
1461}
1462
04b1db9f
IN
1463static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1464{
a58730c4 1465 unsigned int section;
04b1db9f
IN
1466
1467 for (section = 0; section < sect_attrs->nsections; section++)
1468 kfree(sect_attrs->attrs[section].name);
1469 kfree(sect_attrs);
1470}
1471
8f6d0378 1472static void add_sect_attrs(struct module *mod, const struct load_info *info)
1da177e4
LT
1473{
1474 unsigned int nloaded = 0, i, size[2];
1475 struct module_sect_attrs *sect_attrs;
1476 struct module_sect_attr *sattr;
1477 struct attribute **gattr;
22a8bdeb 1478
1da177e4 1479 /* Count loaded sections and allocate structures */
8f6d0378
RR
1480 for (i = 0; i < info->hdr->e_shnum; i++)
1481 if (!sect_empty(&info->sechdrs[i]))
1da177e4
LT
1482 nloaded++;
1483 size[0] = ALIGN(sizeof(*sect_attrs)
1484 + nloaded * sizeof(sect_attrs->attrs[0]),
1485 sizeof(sect_attrs->grp.attrs[0]));
1486 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
04b1db9f
IN
1487 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1488 if (sect_attrs == NULL)
1da177e4
LT
1489 return;
1490
1491 /* Setup section attributes. */
1492 sect_attrs->grp.name = "sections";
1493 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1494
04b1db9f 1495 sect_attrs->nsections = 0;
1da177e4
LT
1496 sattr = &sect_attrs->attrs[0];
1497 gattr = &sect_attrs->grp.attrs[0];
8f6d0378
RR
1498 for (i = 0; i < info->hdr->e_shnum; i++) {
1499 Elf_Shdr *sec = &info->sechdrs[i];
1500 if (sect_empty(sec))
35dead42 1501 continue;
8f6d0378
RR
1502 sattr->address = sec->sh_addr;
1503 sattr->name = kstrdup(info->secstrings + sec->sh_name,
04b1db9f
IN
1504 GFP_KERNEL);
1505 if (sattr->name == NULL)
1506 goto out;
1507 sect_attrs->nsections++;
361795b1 1508 sysfs_attr_init(&sattr->mattr.attr);
1da177e4
LT
1509 sattr->mattr.show = module_sect_show;
1510 sattr->mattr.store = NULL;
1511 sattr->mattr.attr.name = sattr->name;
1da177e4
LT
1512 sattr->mattr.attr.mode = S_IRUGO;
1513 *(gattr++) = &(sattr++)->mattr.attr;
1514 }
1515 *gattr = NULL;
1516
1517 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1518 goto out;
1519
1520 mod->sect_attrs = sect_attrs;
1521 return;
1522 out:
04b1db9f 1523 free_sect_attrs(sect_attrs);
1da177e4
LT
1524}
1525
1526static void remove_sect_attrs(struct module *mod)
1527{
1528 if (mod->sect_attrs) {
1529 sysfs_remove_group(&mod->mkobj.kobj,
1530 &mod->sect_attrs->grp);
1531 /* We are positive that no one is using any sect attrs
1532 * at this point. Deallocate immediately. */
04b1db9f 1533 free_sect_attrs(mod->sect_attrs);
1da177e4
LT
1534 mod->sect_attrs = NULL;
1535 }
1536}
1537
6d760133
RM
1538/*
1539 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1540 */
1541
1542struct module_notes_attrs {
1543 struct kobject *dir;
1544 unsigned int notes;
1545 struct bin_attribute attrs[0];
1546};
1547
2c3c8bea 1548static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
6d760133
RM
1549 struct bin_attribute *bin_attr,
1550 char *buf, loff_t pos, size_t count)
1551{
1552 /*
1553 * The caller checked the pos and count against our size.
1554 */
1555 memcpy(buf, bin_attr->private + pos, count);
1556 return count;
1557}
1558
1559static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1560 unsigned int i)
1561{
1562 if (notes_attrs->dir) {
1563 while (i-- > 0)
1564 sysfs_remove_bin_file(notes_attrs->dir,
1565 &notes_attrs->attrs[i]);
e9432093 1566 kobject_put(notes_attrs->dir);
6d760133
RM
1567 }
1568 kfree(notes_attrs);
1569}
1570
8f6d0378 1571static void add_notes_attrs(struct module *mod, const struct load_info *info)
6d760133
RM
1572{
1573 unsigned int notes, loaded, i;
1574 struct module_notes_attrs *notes_attrs;
1575 struct bin_attribute *nattr;
1576
ea6bff36
IM
1577 /* failed to create section attributes, so can't create notes */
1578 if (!mod->sect_attrs)
1579 return;
1580
6d760133
RM
1581 /* Count notes sections and allocate structures. */
1582 notes = 0;
8f6d0378
RR
1583 for (i = 0; i < info->hdr->e_shnum; i++)
1584 if (!sect_empty(&info->sechdrs[i]) &&
1585 (info->sechdrs[i].sh_type == SHT_NOTE))
6d760133
RM
1586 ++notes;
1587
1588 if (notes == 0)
1589 return;
1590
1591 notes_attrs = kzalloc(sizeof(*notes_attrs)
1592 + notes * sizeof(notes_attrs->attrs[0]),
1593 GFP_KERNEL);
1594 if (notes_attrs == NULL)
1595 return;
1596
1597 notes_attrs->notes = notes;
1598 nattr = &notes_attrs->attrs[0];
8f6d0378
RR
1599 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1600 if (sect_empty(&info->sechdrs[i]))
6d760133 1601 continue;
8f6d0378 1602 if (info->sechdrs[i].sh_type == SHT_NOTE) {
361795b1 1603 sysfs_bin_attr_init(nattr);
6d760133
RM
1604 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1605 nattr->attr.mode = S_IRUGO;
8f6d0378
RR
1606 nattr->size = info->sechdrs[i].sh_size;
1607 nattr->private = (void *) info->sechdrs[i].sh_addr;
6d760133
RM
1608 nattr->read = module_notes_read;
1609 ++nattr;
1610 }
1611 ++loaded;
1612 }
1613
4ff6abff 1614 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
6d760133
RM
1615 if (!notes_attrs->dir)
1616 goto out;
1617
1618 for (i = 0; i < notes; ++i)
1619 if (sysfs_create_bin_file(notes_attrs->dir,
1620 &notes_attrs->attrs[i]))
1621 goto out;
1622
1623 mod->notes_attrs = notes_attrs;
1624 return;
1625
1626 out:
1627 free_notes_attrs(notes_attrs, i);
1628}
1629
1630static void remove_notes_attrs(struct module *mod)
1631{
1632 if (mod->notes_attrs)
1633 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1634}
1635
1da177e4 1636#else
04b1db9f 1637
8f6d0378
RR
1638static inline void add_sect_attrs(struct module *mod,
1639 const struct load_info *info)
1da177e4
LT
1640{
1641}
1642
1643static inline void remove_sect_attrs(struct module *mod)
1644{
1645}
6d760133 1646
8f6d0378
RR
1647static inline void add_notes_attrs(struct module *mod,
1648 const struct load_info *info)
6d760133
RM
1649{
1650}
1651
1652static inline void remove_notes_attrs(struct module *mod)
1653{
1654}
8f6d0378 1655#endif /* CONFIG_KALLSYMS */
1da177e4 1656
80a3d1bb
RR
1657static void add_usage_links(struct module *mod)
1658{
1659#ifdef CONFIG_MODULE_UNLOAD
1660 struct module_use *use;
1661 int nowarn;
1662
75676500 1663 mutex_lock(&module_mutex);
80a3d1bb
RR
1664 list_for_each_entry(use, &mod->target_list, target_list) {
1665 nowarn = sysfs_create_link(use->target->holders_dir,
1666 &mod->mkobj.kobj, mod->name);
1667 }
75676500 1668 mutex_unlock(&module_mutex);
80a3d1bb
RR
1669#endif
1670}
1671
1672static void del_usage_links(struct module *mod)
1673{
1674#ifdef CONFIG_MODULE_UNLOAD
1675 struct module_use *use;
1676
75676500 1677 mutex_lock(&module_mutex);
80a3d1bb
RR
1678 list_for_each_entry(use, &mod->target_list, target_list)
1679 sysfs_remove_link(use->target->holders_dir, mod->name);
75676500 1680 mutex_unlock(&module_mutex);
80a3d1bb
RR
1681#endif
1682}
1683
6407ebb2 1684static int module_add_modinfo_attrs(struct module *mod)
c988d2b2
MD
1685{
1686 struct module_attribute *attr;
03e88ae1 1687 struct module_attribute *temp_attr;
c988d2b2
MD
1688 int error = 0;
1689 int i;
1690
03e88ae1
GKH
1691 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1692 (ARRAY_SIZE(modinfo_attrs) + 1)),
1693 GFP_KERNEL);
1694 if (!mod->modinfo_attrs)
1695 return -ENOMEM;
1696
1697 temp_attr = mod->modinfo_attrs;
c988d2b2 1698 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
c75b590d 1699 if (!attr->test || attr->test(mod)) {
03e88ae1 1700 memcpy(temp_attr, attr, sizeof(*temp_attr));
361795b1 1701 sysfs_attr_init(&temp_attr->attr);
6da0b565
IA
1702 error = sysfs_create_file(&mod->mkobj.kobj,
1703 &temp_attr->attr);
03e88ae1
GKH
1704 ++temp_attr;
1705 }
c988d2b2
MD
1706 }
1707 return error;
1708}
1709
6407ebb2 1710static void module_remove_modinfo_attrs(struct module *mod)
c988d2b2
MD
1711{
1712 struct module_attribute *attr;
1713 int i;
1714
03e88ae1
GKH
1715 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1716 /* pick a field to test for end of list */
1717 if (!attr->attr.name)
1718 break;
6da0b565 1719 sysfs_remove_file(&mod->mkobj.kobj, &attr->attr);
03e88ae1
GKH
1720 if (attr->free)
1721 attr->free(mod);
c988d2b2 1722 }
03e88ae1 1723 kfree(mod->modinfo_attrs);
c988d2b2 1724}
1da177e4 1725
942e4431
LZ
1726static void mod_kobject_put(struct module *mod)
1727{
1728 DECLARE_COMPLETION_ONSTACK(c);
1729 mod->mkobj.kobj_completion = &c;
1730 kobject_put(&mod->mkobj.kobj);
1731 wait_for_completion(&c);
1732}
1733
6407ebb2 1734static int mod_sysfs_init(struct module *mod)
1da177e4
LT
1735{
1736 int err;
6494a93d 1737 struct kobject *kobj;
1da177e4 1738
823bccfc 1739 if (!module_sysfs_initialized) {
bddb12b3 1740 pr_err("%s: module sysfs not initialized\n", mod->name);
1cc5f714
ES
1741 err = -EINVAL;
1742 goto out;
1743 }
6494a93d
GKH
1744
1745 kobj = kset_find_obj(module_kset, mod->name);
1746 if (kobj) {
bddb12b3 1747 pr_err("%s: module is already loaded\n", mod->name);
6494a93d
GKH
1748 kobject_put(kobj);
1749 err = -EINVAL;
1750 goto out;
1751 }
1752
1da177e4 1753 mod->mkobj.mod = mod;
e17e0f51 1754
ac3c8141
GKH
1755 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1756 mod->mkobj.kobj.kset = module_kset;
1757 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1758 "%s", mod->name);
1759 if (err)
942e4431 1760 mod_kobject_put(mod);
270a6c4c 1761
97c146ef 1762 /* delay uevent until full sysfs population */
270a6c4c
KS
1763out:
1764 return err;
1765}
1766
6407ebb2 1767static int mod_sysfs_setup(struct module *mod,
8f6d0378 1768 const struct load_info *info,
270a6c4c
KS
1769 struct kernel_param *kparam,
1770 unsigned int num_params)
1771{
1772 int err;
1773
80a3d1bb
RR
1774 err = mod_sysfs_init(mod);
1775 if (err)
1776 goto out;
1777
4ff6abff 1778 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
240936e1
AM
1779 if (!mod->holders_dir) {
1780 err = -ENOMEM;
270a6c4c 1781 goto out_unreg;
240936e1 1782 }
270a6c4c 1783
1da177e4
LT
1784 err = module_param_sysfs_setup(mod, kparam, num_params);
1785 if (err)
270a6c4c 1786 goto out_unreg_holders;
1da177e4 1787
c988d2b2
MD
1788 err = module_add_modinfo_attrs(mod);
1789 if (err)
e17e0f51 1790 goto out_unreg_param;
c988d2b2 1791
80a3d1bb 1792 add_usage_links(mod);
8f6d0378
RR
1793 add_sect_attrs(mod, info);
1794 add_notes_attrs(mod, info);
80a3d1bb 1795
e17e0f51 1796 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1da177e4
LT
1797 return 0;
1798
e17e0f51
KS
1799out_unreg_param:
1800 module_param_sysfs_remove(mod);
270a6c4c 1801out_unreg_holders:
78a2d906 1802 kobject_put(mod->holders_dir);
270a6c4c 1803out_unreg:
942e4431 1804 mod_kobject_put(mod);
80a3d1bb 1805out:
1da177e4
LT
1806 return err;
1807}
34e4e2fe
DL
1808
1809static void mod_sysfs_fini(struct module *mod)
1810{
8f6d0378
RR
1811 remove_notes_attrs(mod);
1812 remove_sect_attrs(mod);
942e4431 1813 mod_kobject_put(mod);
34e4e2fe
DL
1814}
1815
cf2fde7b
RR
1816static void init_param_lock(struct module *mod)
1817{
1818 mutex_init(&mod->param_lock);
1819}
8f6d0378 1820#else /* !CONFIG_SYSFS */
34e4e2fe 1821
8f6d0378
RR
1822static int mod_sysfs_setup(struct module *mod,
1823 const struct load_info *info,
6407ebb2
RR
1824 struct kernel_param *kparam,
1825 unsigned int num_params)
1826{
1827 return 0;
1828}
1829
34e4e2fe
DL
1830static void mod_sysfs_fini(struct module *mod)
1831{
1832}
1833
36b0360d
RR
1834static void module_remove_modinfo_attrs(struct module *mod)
1835{
1836}
1837
80a3d1bb
RR
1838static void del_usage_links(struct module *mod)
1839{
1840}
1841
cf2fde7b
RR
1842static void init_param_lock(struct module *mod)
1843{
1844}
34e4e2fe 1845#endif /* CONFIG_SYSFS */
1da177e4 1846
36b0360d 1847static void mod_sysfs_teardown(struct module *mod)
1da177e4 1848{
80a3d1bb 1849 del_usage_links(mod);
c988d2b2 1850 module_remove_modinfo_attrs(mod);
1da177e4 1851 module_param_sysfs_remove(mod);
78a2d906
GKH
1852 kobject_put(mod->mkobj.drivers_dir);
1853 kobject_put(mod->holders_dir);
34e4e2fe 1854 mod_sysfs_fini(mod);
1da177e4
LT
1855}
1856
84e1c6bb 1857#ifdef CONFIG_DEBUG_SET_MODULE_RONX
1858/*
1859 * LKM RO/NX protection: protect module's text/ro-data
1860 * from modification and any data from execution.
85c898db
RR
1861 *
1862 * General layout of module is:
444d13ff
JY
1863 * [text] [read-only-data] [ro-after-init] [writable data]
1864 * text_size -----^ ^ ^ ^
1865 * ro_size ------------------------| | |
1866 * ro_after_init_size -----------------------------| |
1867 * size -----------------------------------------------------------|
85c898db
RR
1868 *
1869 * These values are always page-aligned (as is base)
84e1c6bb 1870 */
85c898db
RR
1871static void frob_text(const struct module_layout *layout,
1872 int (*set_memory)(unsigned long start, int num_pages))
84e1c6bb 1873{
85c898db
RR
1874 BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1));
1875 BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1));
1876 set_memory((unsigned long)layout->base,
1877 layout->text_size >> PAGE_SHIFT);
84e1c6bb 1878}
84e1c6bb 1879
85c898db
RR
1880static void frob_rodata(const struct module_layout *layout,
1881 int (*set_memory)(unsigned long start, int num_pages))
84e1c6bb 1882{
85c898db
RR
1883 BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1));
1884 BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1));
1885 BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1));
1886 set_memory((unsigned long)layout->base + layout->text_size,
1887 (layout->ro_size - layout->text_size) >> PAGE_SHIFT);
84e1c6bb 1888}
1889
444d13ff
JY
1890static void frob_ro_after_init(const struct module_layout *layout,
1891 int (*set_memory)(unsigned long start, int num_pages))
1892{
1893 BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1));
1894 BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1));
1895 BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1));
1896 set_memory((unsigned long)layout->base + layout->ro_size,
1897 (layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT);
1898}
1899
85c898db
RR
1900static void frob_writable_data(const struct module_layout *layout,
1901 int (*set_memory)(unsigned long start, int num_pages))
84e1c6bb 1902{
85c898db 1903 BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1));
444d13ff 1904 BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1));
85c898db 1905 BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1));
444d13ff
JY
1906 set_memory((unsigned long)layout->base + layout->ro_after_init_size,
1907 (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT);
84e1c6bb 1908}
84e1c6bb 1909
85c898db
RR
1910/* livepatching wants to disable read-only so it can frob module. */
1911void module_disable_ro(const struct module *mod)
20ef10c1 1912{
85c898db
RR
1913 frob_text(&mod->core_layout, set_memory_rw);
1914 frob_rodata(&mod->core_layout, set_memory_rw);
444d13ff 1915 frob_ro_after_init(&mod->core_layout, set_memory_rw);
85c898db
RR
1916 frob_text(&mod->init_layout, set_memory_rw);
1917 frob_rodata(&mod->init_layout, set_memory_rw);
20ef10c1 1918}
84e1c6bb 1919
444d13ff 1920void module_enable_ro(const struct module *mod, bool after_init)
01526ed0 1921{
85c898db
RR
1922 frob_text(&mod->core_layout, set_memory_ro);
1923 frob_rodata(&mod->core_layout, set_memory_ro);
1924 frob_text(&mod->init_layout, set_memory_ro);
1925 frob_rodata(&mod->init_layout, set_memory_ro);
444d13ff
JY
1926
1927 if (after_init)
1928 frob_ro_after_init(&mod->core_layout, set_memory_ro);
84e1c6bb 1929}
1930
85c898db 1931static void module_enable_nx(const struct module *mod)
01526ed0 1932{
85c898db 1933 frob_rodata(&mod->core_layout, set_memory_nx);
444d13ff 1934 frob_ro_after_init(&mod->core_layout, set_memory_nx);
85c898db
RR
1935 frob_writable_data(&mod->core_layout, set_memory_nx);
1936 frob_rodata(&mod->init_layout, set_memory_nx);
1937 frob_writable_data(&mod->init_layout, set_memory_nx);
01526ed0
JG
1938}
1939
85c898db 1940static void module_disable_nx(const struct module *mod)
01526ed0 1941{
85c898db 1942 frob_rodata(&mod->core_layout, set_memory_x);
444d13ff 1943 frob_ro_after_init(&mod->core_layout, set_memory_x);
85c898db
RR
1944 frob_writable_data(&mod->core_layout, set_memory_x);
1945 frob_rodata(&mod->init_layout, set_memory_x);
1946 frob_writable_data(&mod->init_layout, set_memory_x);
84e1c6bb 1947}
1948
1949/* Iterate through all modules and set each module's text as RW */
5d05c708 1950void set_all_modules_text_rw(void)
84e1c6bb 1951{
1952 struct module *mod;
1953
1954 mutex_lock(&module_mutex);
1955 list_for_each_entry_rcu(mod, &modules, list) {
0d21b0e3
RR
1956 if (mod->state == MODULE_STATE_UNFORMED)
1957 continue;
85c898db
RR
1958
1959 frob_text(&mod->core_layout, set_memory_rw);
1960 frob_text(&mod->init_layout, set_memory_rw);
84e1c6bb 1961 }
1962 mutex_unlock(&module_mutex);
1963}
1964
1965/* Iterate through all modules and set each module's text as RO */
5d05c708 1966void set_all_modules_text_ro(void)
84e1c6bb 1967{
1968 struct module *mod;
1969
1970 mutex_lock(&module_mutex);
1971 list_for_each_entry_rcu(mod, &modules, list) {
0d21b0e3
RR
1972 if (mod->state == MODULE_STATE_UNFORMED)
1973 continue;
85c898db
RR
1974
1975 frob_text(&mod->core_layout, set_memory_ro);
1976 frob_text(&mod->init_layout, set_memory_ro);
84e1c6bb 1977 }
1978 mutex_unlock(&module_mutex);
1979}
85c898db
RR
1980
1981static void disable_ro_nx(const struct module_layout *layout)
1982{
1983 frob_text(layout, set_memory_rw);
1984 frob_rodata(layout, set_memory_rw);
1985 frob_rodata(layout, set_memory_x);
444d13ff
JY
1986 frob_ro_after_init(layout, set_memory_rw);
1987 frob_ro_after_init(layout, set_memory_x);
85c898db
RR
1988 frob_writable_data(layout, set_memory_x);
1989}
1990
84e1c6bb 1991#else
85c898db
RR
1992static void disable_ro_nx(const struct module_layout *layout) { }
1993static void module_enable_nx(const struct module *mod) { }
1994static void module_disable_nx(const struct module *mod) { }
84e1c6bb 1995#endif
1996
1ce15ef4
JY
1997#ifdef CONFIG_LIVEPATCH
1998/*
1999 * Persist Elf information about a module. Copy the Elf header,
2000 * section header table, section string table, and symtab section
2001 * index from info to mod->klp_info.
2002 */
2003static int copy_module_elf(struct module *mod, struct load_info *info)
2004{
2005 unsigned int size, symndx;
2006 int ret;
2007
2008 size = sizeof(*mod->klp_info);
2009 mod->klp_info = kmalloc(size, GFP_KERNEL);
2010 if (mod->klp_info == NULL)
2011 return -ENOMEM;
2012
2013 /* Elf header */
2014 size = sizeof(mod->klp_info->hdr);
2015 memcpy(&mod->klp_info->hdr, info->hdr, size);
2016
2017 /* Elf section header table */
2018 size = sizeof(*info->sechdrs) * info->hdr->e_shnum;
2019 mod->klp_info->sechdrs = kmalloc(size, GFP_KERNEL);
2020 if (mod->klp_info->sechdrs == NULL) {
2021 ret = -ENOMEM;
2022 goto free_info;
2023 }
2024 memcpy(mod->klp_info->sechdrs, info->sechdrs, size);
2025
2026 /* Elf section name string table */
2027 size = info->sechdrs[info->hdr->e_shstrndx].sh_size;
2028 mod->klp_info->secstrings = kmalloc(size, GFP_KERNEL);
2029 if (mod->klp_info->secstrings == NULL) {
2030 ret = -ENOMEM;
2031 goto free_sechdrs;
2032 }
2033 memcpy(mod->klp_info->secstrings, info->secstrings, size);
2034
2035 /* Elf symbol section index */
2036 symndx = info->index.sym;
2037 mod->klp_info->symndx = symndx;
2038
2039 /*
2040 * For livepatch modules, core_kallsyms.symtab is a complete
2041 * copy of the original symbol table. Adjust sh_addr to point
2042 * to core_kallsyms.symtab since the copy of the symtab in module
2043 * init memory is freed at the end of do_init_module().
2044 */
2045 mod->klp_info->sechdrs[symndx].sh_addr = \
2046 (unsigned long) mod->core_kallsyms.symtab;
2047
2048 return 0;
2049
2050free_sechdrs:
2051 kfree(mod->klp_info->sechdrs);
2052free_info:
2053 kfree(mod->klp_info);
2054 return ret;
2055}
2056
2057static void free_module_elf(struct module *mod)
2058{
2059 kfree(mod->klp_info->sechdrs);
2060 kfree(mod->klp_info->secstrings);
2061 kfree(mod->klp_info);
2062}
2063#else /* !CONFIG_LIVEPATCH */
2064static int copy_module_elf(struct module *mod, struct load_info *info)
2065{
2066 return 0;
2067}
2068
2069static void free_module_elf(struct module *mod)
2070{
2071}
2072#endif /* CONFIG_LIVEPATCH */
2073
be1f221c 2074void __weak module_memfree(void *module_region)
74e08fcf
JB
2075{
2076 vfree(module_region);
2077}
2078
2079void __weak module_arch_cleanup(struct module *mod)
2080{
2081}
2082
d453cded
RR
2083void __weak module_arch_freeing_init(struct module *mod)
2084{
2085}
2086
75676500 2087/* Free a module, remove from lists, etc. */
1da177e4
LT
2088static void free_module(struct module *mod)
2089{
7ead8b83
LZ
2090 trace_module_free(mod);
2091
36b0360d 2092 mod_sysfs_teardown(mod);
1da177e4 2093
944a1fa0
RR
2094 /* We leave it in list to prevent duplicate loads, but make sure
2095 * that noone uses it while it's being deconstructed. */
d3051b48 2096 mutex_lock(&module_mutex);
944a1fa0 2097 mod->state = MODULE_STATE_UNFORMED;
d3051b48 2098 mutex_unlock(&module_mutex);
944a1fa0 2099
b82bab4b
JB
2100 /* Remove dynamic debug info */
2101 ddebug_remove_module(mod->name);
2102
1da177e4
LT
2103 /* Arch-specific cleanup. */
2104 module_arch_cleanup(mod);
2105
2106 /* Module unload stuff */
2107 module_unload_free(mod);
2108
e180a6b7
RR
2109 /* Free any allocated parameters. */
2110 destroy_params(mod->kp, mod->num_kp);
2111
1ce15ef4
JY
2112 if (is_livepatch_module(mod))
2113 free_module_elf(mod);
2114
944a1fa0
RR
2115 /* Now we can delete it from the lists */
2116 mutex_lock(&module_mutex);
461e34ae
MH
2117 /* Unlink carefully: kallsyms could be walking list. */
2118 list_del_rcu(&mod->list);
93c2e105 2119 mod_tree_remove(mod);
0286b5ea 2120 /* Remove this module from bug list, this uses list_del_rcu */
461e34ae 2121 module_bug_cleanup(mod);
0be964be
PZ
2122 /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */
2123 synchronize_sched();
944a1fa0
RR
2124 mutex_unlock(&module_mutex);
2125
85c898db
RR
2126 /* This may be empty, but that's OK */
2127 disable_ro_nx(&mod->init_layout);
d453cded 2128 module_arch_freeing_init(mod);
7523e4dc 2129 module_memfree(mod->init_layout.base);
1da177e4 2130 kfree(mod->args);
259354de 2131 percpu_modfree(mod);
9f85a4bb 2132
35a9393c 2133 /* Free lock-classes; relies on the preceding sync_rcu(). */
7523e4dc 2134 lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size);
fbb9ce95 2135
1da177e4 2136 /* Finally, free the core (containing the module structure) */
85c898db 2137 disable_ro_nx(&mod->core_layout);
7523e4dc 2138 module_memfree(mod->core_layout.base);
eb8cdec4
BS
2139
2140#ifdef CONFIG_MPU
2141 update_protections(current->mm);
2142#endif
1da177e4
LT
2143}
2144
2145void *__symbol_get(const char *symbol)
2146{
2147 struct module *owner;
414fd31b 2148 const struct kernel_symbol *sym;
1da177e4 2149
24da1cbf 2150 preempt_disable();
414fd31b
TA
2151 sym = find_symbol(symbol, &owner, NULL, true, true);
2152 if (sym && strong_try_module_get(owner))
2153 sym = NULL;
24da1cbf 2154 preempt_enable();
1da177e4 2155
414fd31b 2156 return sym ? (void *)sym->value : NULL;
1da177e4
LT
2157}
2158EXPORT_SYMBOL_GPL(__symbol_get);
2159
eea8b54d
AN
2160/*
2161 * Ensure that an exported symbol [global namespace] does not already exist
02a3e59a 2162 * in the kernel or in some other module's exported symbol table.
be593f4c
RR
2163 *
2164 * You must hold the module_mutex.
eea8b54d
AN
2165 */
2166static int verify_export_symbols(struct module *mod)
2167{
b211104d 2168 unsigned int i;
eea8b54d 2169 struct module *owner;
b211104d
RR
2170 const struct kernel_symbol *s;
2171 struct {
2172 const struct kernel_symbol *sym;
2173 unsigned int num;
2174 } arr[] = {
2175 { mod->syms, mod->num_syms },
2176 { mod->gpl_syms, mod->num_gpl_syms },
2177 { mod->gpl_future_syms, mod->num_gpl_future_syms },
f7f5b675 2178#ifdef CONFIG_UNUSED_SYMBOLS
b211104d
RR
2179 { mod->unused_syms, mod->num_unused_syms },
2180 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
f7f5b675 2181#endif
b211104d 2182 };
eea8b54d 2183
b211104d
RR
2184 for (i = 0; i < ARRAY_SIZE(arr); i++) {
2185 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
be593f4c 2186 if (find_symbol(s->name, &owner, NULL, true, false)) {
bddb12b3 2187 pr_err("%s: exports duplicate symbol %s"
b211104d
RR
2188 " (owned by %s)\n",
2189 mod->name, s->name, module_name(owner));
2190 return -ENOEXEC;
2191 }
eea8b54d 2192 }
b211104d
RR
2193 }
2194 return 0;
eea8b54d
AN
2195}
2196
9a4b9708 2197/* Change all symbols so that st_value encodes the pointer directly. */
49668688
RR
2198static int simplify_symbols(struct module *mod, const struct load_info *info)
2199{
2200 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
2201 Elf_Sym *sym = (void *)symsec->sh_addr;
1da177e4 2202 unsigned long secbase;
49668688 2203 unsigned int i;
1da177e4 2204 int ret = 0;
414fd31b 2205 const struct kernel_symbol *ksym;
1da177e4 2206
49668688
RR
2207 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
2208 const char *name = info->strtab + sym[i].st_name;
2209
1da177e4
LT
2210 switch (sym[i].st_shndx) {
2211 case SHN_COMMON:
80375980
JM
2212 /* Ignore common symbols */
2213 if (!strncmp(name, "__gnu_lto", 9))
2214 break;
2215
1da177e4
LT
2216 /* We compiled with -fno-common. These are not
2217 supposed to happen. */
5e124169 2218 pr_debug("Common symbol: %s\n", name);
6da0b565 2219 pr_warn("%s: please compile with -fno-common\n",
1da177e4
LT
2220 mod->name);
2221 ret = -ENOEXEC;
2222 break;
2223
2224 case SHN_ABS:
2225 /* Don't need to do anything */
5e124169 2226 pr_debug("Absolute symbol: 0x%08lx\n",
1da177e4
LT
2227 (long)sym[i].st_value);
2228 break;
2229
1ce15ef4
JY
2230 case SHN_LIVEPATCH:
2231 /* Livepatch symbols are resolved by livepatch */
2232 break;
2233
1da177e4 2234 case SHN_UNDEF:
49668688 2235 ksym = resolve_symbol_wait(mod, info, name);
1da177e4 2236 /* Ok if resolved. */
9bea7f23 2237 if (ksym && !IS_ERR(ksym)) {
414fd31b 2238 sym[i].st_value = ksym->value;
1da177e4 2239 break;
414fd31b
TA
2240 }
2241
1da177e4 2242 /* Ok if weak. */
9bea7f23 2243 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1da177e4
LT
2244 break;
2245
bddb12b3
AM
2246 pr_warn("%s: Unknown symbol %s (err %li)\n",
2247 mod->name, name, PTR_ERR(ksym));
9bea7f23 2248 ret = PTR_ERR(ksym) ?: -ENOENT;
1da177e4
LT
2249 break;
2250
2251 default:
2252 /* Divert to percpu allocation if a percpu var. */
49668688 2253 if (sym[i].st_shndx == info->index.pcpu)
259354de 2254 secbase = (unsigned long)mod_percpu(mod);
1da177e4 2255 else
49668688 2256 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
1da177e4
LT
2257 sym[i].st_value += secbase;
2258 break;
2259 }
2260 }
2261
2262 return ret;
2263}
2264
49668688 2265static int apply_relocations(struct module *mod, const struct load_info *info)
22e268eb
RR
2266{
2267 unsigned int i;
2268 int err = 0;
2269
2270 /* Now do relocations. */
49668688
RR
2271 for (i = 1; i < info->hdr->e_shnum; i++) {
2272 unsigned int infosec = info->sechdrs[i].sh_info;
22e268eb
RR
2273
2274 /* Not a valid relocation section? */
49668688 2275 if (infosec >= info->hdr->e_shnum)
22e268eb
RR
2276 continue;
2277
2278 /* Don't bother with non-allocated sections */
49668688 2279 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
22e268eb
RR
2280 continue;
2281
1ce15ef4
JY
2282 /* Livepatch relocation sections are applied by livepatch */
2283 if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH)
2284 continue;
2285
49668688
RR
2286 if (info->sechdrs[i].sh_type == SHT_REL)
2287 err = apply_relocate(info->sechdrs, info->strtab,
2288 info->index.sym, i, mod);
2289 else if (info->sechdrs[i].sh_type == SHT_RELA)
2290 err = apply_relocate_add(info->sechdrs, info->strtab,
2291 info->index.sym, i, mod);
22e268eb
RR
2292 if (err < 0)
2293 break;
2294 }
2295 return err;
2296}
2297
088af9a6
HD
2298/* Additional bytes needed by arch in front of individual sections */
2299unsigned int __weak arch_mod_section_prepend(struct module *mod,
2300 unsigned int section)
2301{
2302 /* default implementation just returns zero */
2303 return 0;
2304}
2305
1da177e4 2306/* Update size with this section: return offset. */
088af9a6
HD
2307static long get_offset(struct module *mod, unsigned int *size,
2308 Elf_Shdr *sechdr, unsigned int section)
1da177e4
LT
2309{
2310 long ret;
2311
088af9a6 2312 *size += arch_mod_section_prepend(mod, section);
1da177e4
LT
2313 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
2314 *size = ret + sechdr->sh_size;
2315 return ret;
2316}
2317
2318/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2319 might -- code, read-only data, read-write data, small data. Tally
2320 sizes, and place the offsets into sh_entsize fields: high bit means it
2321 belongs in init. */
49668688 2322static void layout_sections(struct module *mod, struct load_info *info)
1da177e4
LT
2323{
2324 static unsigned long const masks[][2] = {
2325 /* NOTE: all executable code must be the first section
2326 * in this array; otherwise modify the text_size
2327 * finder in the two loops below */
2328 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
2329 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
444d13ff 2330 { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL },
1da177e4
LT
2331 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
2332 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
2333 };
2334 unsigned int m, i;
2335
49668688
RR
2336 for (i = 0; i < info->hdr->e_shnum; i++)
2337 info->sechdrs[i].sh_entsize = ~0UL;
1da177e4 2338
5e124169 2339 pr_debug("Core section allocation order:\n");
1da177e4 2340 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
49668688
RR
2341 for (i = 0; i < info->hdr->e_shnum; ++i) {
2342 Elf_Shdr *s = &info->sechdrs[i];
2343 const char *sname = info->secstrings + s->sh_name;
1da177e4
LT
2344
2345 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2346 || (s->sh_flags & masks[m][1])
2347 || s->sh_entsize != ~0UL
49668688 2348 || strstarts(sname, ".init"))
1da177e4 2349 continue;
7523e4dc 2350 s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i);
5e124169 2351 pr_debug("\t%s\n", sname);
1da177e4 2352 }
84e1c6bb 2353 switch (m) {
2354 case 0: /* executable */
7523e4dc
RR
2355 mod->core_layout.size = debug_align(mod->core_layout.size);
2356 mod->core_layout.text_size = mod->core_layout.size;
84e1c6bb 2357 break;
2358 case 1: /* RO: text and ro-data */
7523e4dc
RR
2359 mod->core_layout.size = debug_align(mod->core_layout.size);
2360 mod->core_layout.ro_size = mod->core_layout.size;
84e1c6bb 2361 break;
444d13ff
JY
2362 case 2: /* RO after init */
2363 mod->core_layout.size = debug_align(mod->core_layout.size);
2364 mod->core_layout.ro_after_init_size = mod->core_layout.size;
2365 break;
2366 case 4: /* whole core */
7523e4dc 2367 mod->core_layout.size = debug_align(mod->core_layout.size);
84e1c6bb 2368 break;
2369 }
1da177e4
LT
2370 }
2371
5e124169 2372 pr_debug("Init section allocation order:\n");
1da177e4 2373 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
49668688
RR
2374 for (i = 0; i < info->hdr->e_shnum; ++i) {
2375 Elf_Shdr *s = &info->sechdrs[i];
2376 const char *sname = info->secstrings + s->sh_name;
1da177e4
LT
2377
2378 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2379 || (s->sh_flags & masks[m][1])
2380 || s->sh_entsize != ~0UL
49668688 2381 || !strstarts(sname, ".init"))
1da177e4 2382 continue;
7523e4dc 2383 s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i)
1da177e4 2384 | INIT_OFFSET_MASK);
5e124169 2385 pr_debug("\t%s\n", sname);
1da177e4 2386 }
84e1c6bb 2387 switch (m) {
2388 case 0: /* executable */
7523e4dc
RR
2389 mod->init_layout.size = debug_align(mod->init_layout.size);
2390 mod->init_layout.text_size = mod->init_layout.size;
84e1c6bb 2391 break;
2392 case 1: /* RO: text and ro-data */
7523e4dc
RR
2393 mod->init_layout.size = debug_align(mod->init_layout.size);
2394 mod->init_layout.ro_size = mod->init_layout.size;
84e1c6bb 2395 break;
444d13ff
JY
2396 case 2:
2397 /*
2398 * RO after init doesn't apply to init_layout (only
2399 * core_layout), so it just takes the value of ro_size.
2400 */
2401 mod->init_layout.ro_after_init_size = mod->init_layout.ro_size;
2402 break;
2403 case 4: /* whole init */
7523e4dc 2404 mod->init_layout.size = debug_align(mod->init_layout.size);
84e1c6bb 2405 break;
2406 }
1da177e4
LT
2407 }
2408}
2409
1da177e4
LT
2410static void set_license(struct module *mod, const char *license)
2411{
2412 if (!license)
2413 license = "unspecified";
2414
fa3ba2e8 2415 if (!license_is_gpl_compatible(license)) {
25ddbb18 2416 if (!test_taint(TAINT_PROPRIETARY_MODULE))
bddb12b3
AM
2417 pr_warn("%s: module license '%s' taints kernel.\n",
2418 mod->name, license);
373d4d09
RR
2419 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2420 LOCKDEP_NOW_UNRELIABLE);
1da177e4
LT
2421 }
2422}
2423
2424/* Parse tag=value strings from .modinfo section */
2425static char *next_string(char *string, unsigned long *secsize)
2426{
2427 /* Skip non-zero chars */
2428 while (string[0]) {
2429 string++;
2430 if ((*secsize)-- <= 1)
2431 return NULL;
2432 }
2433
2434 /* Skip any zero padding. */
2435 while (!string[0]) {
2436 string++;
2437 if ((*secsize)-- <= 1)
2438 return NULL;
2439 }
2440 return string;
2441}
2442
49668688 2443static char *get_modinfo(struct load_info *info, const char *tag)
1da177e4
LT
2444{
2445 char *p;
2446 unsigned int taglen = strlen(tag);
49668688
RR
2447 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2448 unsigned long size = infosec->sh_size;
1da177e4 2449
49668688 2450 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
1da177e4
LT
2451 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2452 return p + taglen + 1;
2453 }
2454 return NULL;
2455}
2456
49668688 2457static void setup_modinfo(struct module *mod, struct load_info *info)
c988d2b2
MD
2458{
2459 struct module_attribute *attr;
2460 int i;
2461
2462 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2463 if (attr->setup)
49668688 2464 attr->setup(mod, get_modinfo(info, attr->attr.name));
c988d2b2
MD
2465 }
2466}
c988d2b2 2467
a263f776
RR
2468static void free_modinfo(struct module *mod)
2469{
2470 struct module_attribute *attr;
2471 int i;
2472
2473 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2474 if (attr->free)
2475 attr->free(mod);
2476 }
2477}
2478
1da177e4 2479#ifdef CONFIG_KALLSYMS
15bba37d
WC
2480
2481/* lookup symbol in given range of kernel_symbols */
2482static const struct kernel_symbol *lookup_symbol(const char *name,
2483 const struct kernel_symbol *start,
2484 const struct kernel_symbol *stop)
2485{
9d63487f
AIB
2486 return bsearch(name, start, stop - start,
2487 sizeof(struct kernel_symbol), cmp_name);
15bba37d
WC
2488}
2489
ca4787b7
TA
2490static int is_exported(const char *name, unsigned long value,
2491 const struct module *mod)
1da177e4 2492{
ca4787b7
TA
2493 const struct kernel_symbol *ks;
2494 if (!mod)
2495 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
3fd6805f 2496 else
ca4787b7
TA
2497 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2498 return ks != NULL && ks->value == value;
1da177e4
LT
2499}
2500
2501/* As per nm */
eded41c1 2502static char elf_type(const Elf_Sym *sym, const struct load_info *info)
1da177e4 2503{
eded41c1
RR
2504 const Elf_Shdr *sechdrs = info->sechdrs;
2505
1da177e4
LT
2506 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
2507 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
2508 return 'v';
2509 else
2510 return 'w';
2511 }
2512 if (sym->st_shndx == SHN_UNDEF)
2513 return 'U';
e0224418 2514 if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu)
1da177e4
LT
2515 return 'a';
2516 if (sym->st_shndx >= SHN_LORESERVE)
2517 return '?';
2518 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
2519 return 't';
2520 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
2521 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
2522 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
2523 return 'r';
2524 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2525 return 'g';
2526 else
2527 return 'd';
2528 }
2529 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
2530 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2531 return 's';
2532 else
2533 return 'b';
2534 }
eded41c1
RR
2535 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2536 ".debug")) {
1da177e4 2537 return 'n';
eded41c1 2538 }
1da177e4
LT
2539 return '?';
2540}
2541
4a496226 2542static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
e0224418 2543 unsigned int shnum, unsigned int pcpundx)
4a496226
JB
2544{
2545 const Elf_Shdr *sec;
2546
2547 if (src->st_shndx == SHN_UNDEF
2548 || src->st_shndx >= shnum
2549 || !src->st_name)
2550 return false;
2551
e0224418
MB
2552#ifdef CONFIG_KALLSYMS_ALL
2553 if (src->st_shndx == pcpundx)
2554 return true;
2555#endif
2556
4a496226
JB
2557 sec = sechdrs + src->st_shndx;
2558 if (!(sec->sh_flags & SHF_ALLOC)
2559#ifndef CONFIG_KALLSYMS_ALL
2560 || !(sec->sh_flags & SHF_EXECINSTR)
2561#endif
2562 || (sec->sh_entsize & INIT_OFFSET_MASK))
2563 return false;
2564
2565 return true;
2566}
2567
48fd1188
KC
2568/*
2569 * We only allocate and copy the strings needed by the parts of symtab
2570 * we keep. This is simple, but has the effect of making multiple
2571 * copies of duplicates. We could be more sophisticated, see
2572 * linux-kernel thread starting with
2573 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2574 */
49668688 2575static void layout_symtab(struct module *mod, struct load_info *info)
4a496226 2576{
49668688
RR
2577 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2578 Elf_Shdr *strsect = info->sechdrs + info->index.str;
4a496226 2579 const Elf_Sym *src;
54523ec7 2580 unsigned int i, nsrc, ndst, strtab_size = 0;
4a496226
JB
2581
2582 /* Put symbol section at end of init part of module. */
2583 symsect->sh_flags |= SHF_ALLOC;
7523e4dc 2584 symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect,
49668688 2585 info->index.sym) | INIT_OFFSET_MASK;
5e124169 2586 pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
4a496226 2587
49668688 2588 src = (void *)info->hdr + symsect->sh_offset;
4a496226 2589 nsrc = symsect->sh_size / sizeof(*src);
70b1e916 2590
48fd1188 2591 /* Compute total space required for the core symbols' strtab. */
59ef28b1 2592 for (ndst = i = 0; i < nsrc; i++) {
1ce15ef4 2593 if (i == 0 || is_livepatch_module(mod) ||
e0224418
MB
2594 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum,
2595 info->index.pcpu)) {
59ef28b1 2596 strtab_size += strlen(&info->strtab[src[i].st_name])+1;
48fd1188 2597 ndst++;
554bdfe5 2598 }
59ef28b1 2599 }
4a496226
JB
2600
2601 /* Append room for core symbols at end of core part. */
7523e4dc
RR
2602 info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1);
2603 info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym);
2604 mod->core_layout.size += strtab_size;
2605 mod->core_layout.size = debug_align(mod->core_layout.size);
4a496226 2606
554bdfe5
JB
2607 /* Put string table section at end of init part of module. */
2608 strsect->sh_flags |= SHF_ALLOC;
7523e4dc 2609 strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect,
49668688 2610 info->index.str) | INIT_OFFSET_MASK;
5e124169 2611 pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
8244062e
RR
2612
2613 /* We'll tack temporary mod_kallsyms on the end. */
2614 mod->init_layout.size = ALIGN(mod->init_layout.size,
2615 __alignof__(struct mod_kallsyms));
2616 info->mod_kallsyms_init_off = mod->init_layout.size;
2617 mod->init_layout.size += sizeof(struct mod_kallsyms);
2618 mod->init_layout.size = debug_align(mod->init_layout.size);
4a496226
JB
2619}
2620
8244062e
RR
2621/*
2622 * We use the full symtab and strtab which layout_symtab arranged to
2623 * be appended to the init section. Later we switch to the cut-down
2624 * core-only ones.
2625 */
811d66a0 2626static void add_kallsyms(struct module *mod, const struct load_info *info)
1da177e4 2627{
4a496226
JB
2628 unsigned int i, ndst;
2629 const Elf_Sym *src;
2630 Elf_Sym *dst;
554bdfe5 2631 char *s;
eded41c1 2632 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1da177e4 2633
8244062e
RR
2634 /* Set up to point into init section. */
2635 mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off;
2636
2637 mod->kallsyms->symtab = (void *)symsec->sh_addr;
2638 mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
511ca6ae 2639 /* Make sure we get permanent strtab: don't use info->strtab. */
8244062e 2640 mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
1da177e4
LT
2641
2642 /* Set types up while we still have access to sections. */
8244062e
RR
2643 for (i = 0; i < mod->kallsyms->num_symtab; i++)
2644 mod->kallsyms->symtab[i].st_info
2645 = elf_type(&mod->kallsyms->symtab[i], info);
2646
2647 /* Now populate the cut down core kallsyms for after init. */
2648 mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs;
2649 mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs;
2650 src = mod->kallsyms->symtab;
2651 for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) {
1ce15ef4 2652 if (i == 0 || is_livepatch_module(mod) ||
e0224418
MB
2653 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum,
2654 info->index.pcpu)) {
59ef28b1 2655 dst[ndst] = src[i];
8244062e
RR
2656 dst[ndst++].st_name = s - mod->core_kallsyms.strtab;
2657 s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name],
59ef28b1
RR
2658 KSYM_NAME_LEN) + 1;
2659 }
4a496226 2660 }
8244062e 2661 mod->core_kallsyms.num_symtab = ndst;
1da177e4
LT
2662}
2663#else
49668688 2664static inline void layout_symtab(struct module *mod, struct load_info *info)
4a496226
JB
2665{
2666}
3ae91c21 2667
abbce906 2668static void add_kallsyms(struct module *mod, const struct load_info *info)
1da177e4
LT
2669{
2670}
2671#endif /* CONFIG_KALLSYMS */
2672
e9d376f0 2673static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
346e15be 2674{
811d66a0
RR
2675 if (!debug)
2676 return;
e9d376f0
JB
2677#ifdef CONFIG_DYNAMIC_DEBUG
2678 if (ddebug_add_module(debug, num, debug->modname))
bddb12b3
AM
2679 pr_err("dynamic debug error adding module: %s\n",
2680 debug->modname);
e9d376f0 2681#endif
5e458cc0 2682}
346e15be 2683
ff49d74a
YS
2684static void dynamic_debug_remove(struct _ddebug *debug)
2685{
2686 if (debug)
2687 ddebug_remove_module(debug->modname);
2688}
2689
74e08fcf
JB
2690void * __weak module_alloc(unsigned long size)
2691{
82fab442 2692 return vmalloc_exec(size);
74e08fcf
JB
2693}
2694
4f2294b6 2695#ifdef CONFIG_DEBUG_KMEMLEAK
49668688
RR
2696static void kmemleak_load_module(const struct module *mod,
2697 const struct load_info *info)
4f2294b6
CM
2698{
2699 unsigned int i;
2700
2701 /* only scan the sections containing data */
c017b4be 2702 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
4f2294b6 2703
49668688 2704 for (i = 1; i < info->hdr->e_shnum; i++) {
06c9494c
SR
2705 /* Scan all writable sections that's not executable */
2706 if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) ||
2707 !(info->sechdrs[i].sh_flags & SHF_WRITE) ||
2708 (info->sechdrs[i].sh_flags & SHF_EXECINSTR))
4f2294b6
CM
2709 continue;
2710
49668688
RR
2711 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2712 info->sechdrs[i].sh_size, GFP_KERNEL);
4f2294b6
CM
2713 }
2714}
2715#else
49668688
RR
2716static inline void kmemleak_load_module(const struct module *mod,
2717 const struct load_info *info)
4f2294b6
CM
2718{
2719}
2720#endif
2721
106a4ee2 2722#ifdef CONFIG_MODULE_SIG
bca014ca 2723static int module_sig_check(struct load_info *info, int flags)
106a4ee2
RR
2724{
2725 int err = -ENOKEY;
34e1169d
KC
2726 const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
2727 const void *mod = info->hdr;
caabe240 2728
bca014ca
BH
2729 /*
2730 * Require flags == 0, as a module with version information
2731 * removed is no longer the module that was signed
2732 */
2733 if (flags == 0 &&
2734 info->len > markerlen &&
34e1169d 2735 memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) {
caabe240 2736 /* We truncate the module to discard the signature */
34e1169d
KC
2737 info->len -= markerlen;
2738 err = mod_verify_sig(mod, &info->len);
106a4ee2
RR
2739 }
2740
2741 if (!err) {
2742 info->sig_ok = true;
2743 return 0;
2744 }
2745
2746 /* Not having a signature is only an error if we're strict. */
2747 if (err == -ENOKEY && !sig_enforce)
2748 err = 0;
2749
2750 return err;
2751}
2752#else /* !CONFIG_MODULE_SIG */
bca014ca 2753static int module_sig_check(struct load_info *info, int flags)
106a4ee2
RR
2754{
2755 return 0;
2756}
2757#endif /* !CONFIG_MODULE_SIG */
2758
34e1169d
KC
2759/* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2760static int elf_header_check(struct load_info *info)
40dd2560 2761{
34e1169d
KC
2762 if (info->len < sizeof(*(info->hdr)))
2763 return -ENOEXEC;
2764
2765 if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0
2766 || info->hdr->e_type != ET_REL
2767 || !elf_check_arch(info->hdr)
2768 || info->hdr->e_shentsize != sizeof(Elf_Shdr))
2769 return -ENOEXEC;
2770
2771 if (info->hdr->e_shoff >= info->len
2772 || (info->hdr->e_shnum * sizeof(Elf_Shdr) >
2773 info->len - info->hdr->e_shoff))
2774 return -ENOEXEC;
40dd2560 2775
34e1169d
KC
2776 return 0;
2777}
2778
3afe9f84
LT
2779#define COPY_CHUNK_SIZE (16*PAGE_SIZE)
2780
2781static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len)
2782{
2783 do {
2784 unsigned long n = min(len, COPY_CHUNK_SIZE);
2785
2786 if (copy_from_user(dst, usrc, n) != 0)
2787 return -EFAULT;
2788 cond_resched();
2789 dst += n;
2790 usrc += n;
2791 len -= n;
2792 } while (len);
2793 return 0;
2794}
2795
1ce15ef4 2796#ifdef CONFIG_LIVEPATCH
2992ef29 2797static int check_modinfo_livepatch(struct module *mod, struct load_info *info)
1ce15ef4 2798{
2992ef29
JP
2799 if (get_modinfo(info, "livepatch")) {
2800 mod->klp = true;
2801 add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK);
2802 }
1ce15ef4
JY
2803
2804 return 0;
2805}
2806#else /* !CONFIG_LIVEPATCH */
2992ef29 2807static int check_modinfo_livepatch(struct module *mod, struct load_info *info)
1ce15ef4
JY
2808{
2809 if (get_modinfo(info, "livepatch")) {
2810 pr_err("%s: module is marked as livepatch module, but livepatch support is disabled",
2811 mod->name);
2812 return -ENOEXEC;
2813 }
2814
2815 return 0;
2816}
2817#endif /* CONFIG_LIVEPATCH */
2818
34e1169d
KC
2819/* Sets info->hdr and info->len. */
2820static int copy_module_from_user(const void __user *umod, unsigned long len,
2821 struct load_info *info)
40dd2560
RR
2822{
2823 int err;
40dd2560 2824
34e1169d
KC
2825 info->len = len;
2826 if (info->len < sizeof(*(info->hdr)))
40dd2560
RR
2827 return -ENOEXEC;
2828
a1db7420 2829 err = security_kernel_read_file(NULL, READING_MODULE);
2e72d51b
KC
2830 if (err)
2831 return err;
2832
40dd2560 2833 /* Suck in entire file: we'll want most of it. */
cc9e605d
KS
2834 info->hdr = __vmalloc(info->len,
2835 GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN, PAGE_KERNEL);
34e1169d 2836 if (!info->hdr)
40dd2560
RR
2837 return -ENOMEM;
2838
3afe9f84 2839 if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) {
34e1169d
KC
2840 vfree(info->hdr);
2841 return -EFAULT;
40dd2560
RR
2842 }
2843
34e1169d
KC
2844 return 0;
2845}
2846
d913188c
RR
2847static void free_copy(struct load_info *info)
2848{
d913188c
RR
2849 vfree(info->hdr);
2850}
2851
2f3238ae 2852static int rewrite_section_headers(struct load_info *info, int flags)
8b5f61a7
RR
2853{
2854 unsigned int i;
2855
2856 /* This should always be true, but let's be sure. */
2857 info->sechdrs[0].sh_addr = 0;
2858
2859 for (i = 1; i < info->hdr->e_shnum; i++) {
2860 Elf_Shdr *shdr = &info->sechdrs[i];
2861 if (shdr->sh_type != SHT_NOBITS
2862 && info->len < shdr->sh_offset + shdr->sh_size) {
bddb12b3 2863 pr_err("Module len %lu truncated\n", info->len);
8b5f61a7
RR
2864 return -ENOEXEC;
2865 }
2866
2867 /* Mark all sections sh_addr with their address in the
2868 temporary image. */
2869 shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
2870
2871#ifndef CONFIG_MODULE_UNLOAD
2872 /* Don't load .exit sections */
2873 if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
2874 shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
2875#endif
8b5f61a7 2876 }
d6df72a0
RR
2877
2878 /* Track but don't keep modinfo and version sections. */
2f3238ae
RR
2879 if (flags & MODULE_INIT_IGNORE_MODVERSIONS)
2880 info->index.vers = 0; /* Pretend no __versions section! */
2881 else
2882 info->index.vers = find_sec(info, "__versions");
49668688 2883 info->index.info = find_sec(info, ".modinfo");
d6df72a0
RR
2884 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2885 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
8b5f61a7
RR
2886 return 0;
2887}
2888
3264d3f9
LT
2889/*
2890 * Set up our basic convenience variables (pointers to section headers,
2891 * search for module section index etc), and do some basic section
2892 * verification.
2893 *
2894 * Return the temporary module pointer (we'll replace it with the final
2895 * one when we move the module sections around).
2896 */
2f3238ae 2897static struct module *setup_load_info(struct load_info *info, int flags)
3264d3f9
LT
2898{
2899 unsigned int i;
8b5f61a7 2900 int err;
3264d3f9
LT
2901 struct module *mod;
2902
2903 /* Set up the convenience variables */
2904 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
8b5f61a7
RR
2905 info->secstrings = (void *)info->hdr
2906 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
3264d3f9 2907
2f3238ae 2908 err = rewrite_section_headers(info, flags);
8b5f61a7
RR
2909 if (err)
2910 return ERR_PTR(err);
3264d3f9 2911
8b5f61a7
RR
2912 /* Find internal symbols and strings. */
2913 for (i = 1; i < info->hdr->e_shnum; i++) {
3264d3f9
LT
2914 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2915 info->index.sym = i;
2916 info->index.str = info->sechdrs[i].sh_link;
8b5f61a7
RR
2917 info->strtab = (char *)info->hdr
2918 + info->sechdrs[info->index.str].sh_offset;
2919 break;
3264d3f9 2920 }
3264d3f9
LT
2921 }
2922
49668688 2923 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
3264d3f9 2924 if (!info->index.mod) {
bddb12b3 2925 pr_warn("No module found in object\n");
3264d3f9
LT
2926 return ERR_PTR(-ENOEXEC);
2927 }
2928 /* This is temporary: point mod into copy of data. */
2929 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2930
2931 if (info->index.sym == 0) {
bddb12b3 2932 pr_warn("%s: module has no symbols (stripped?)\n", mod->name);
3264d3f9
LT
2933 return ERR_PTR(-ENOEXEC);
2934 }
2935
49668688 2936 info->index.pcpu = find_pcpusec(info);
3264d3f9 2937
3264d3f9
LT
2938 /* Check module struct version now, before we try to use module. */
2939 if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
2940 return ERR_PTR(-ENOEXEC);
2941
2942 return mod;
3264d3f9
LT
2943}
2944
2f3238ae 2945static int check_modinfo(struct module *mod, struct load_info *info, int flags)
40dd2560 2946{
49668688 2947 const char *modmagic = get_modinfo(info, "vermagic");
40dd2560
RR
2948 int err;
2949
2f3238ae
RR
2950 if (flags & MODULE_INIT_IGNORE_VERMAGIC)
2951 modmagic = NULL;
2952
40dd2560
RR
2953 /* This is allowed: modprobe --force will invalidate it. */
2954 if (!modmagic) {
2955 err = try_to_force_load(mod, "bad vermagic");
2956 if (err)
2957 return err;
49668688 2958 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
bddb12b3 2959 pr_err("%s: version magic '%s' should be '%s'\n",
40dd2560
RR
2960 mod->name, modmagic, vermagic);
2961 return -ENOEXEC;
2962 }
2963
3205c36c
LP
2964 if (!get_modinfo(info, "intree")) {
2965 if (!test_taint(TAINT_OOT_MODULE))
2966 pr_warn("%s: loading out-of-tree module taints kernel.\n",
2967 mod->name);
373d4d09 2968 add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK);
3205c36c 2969 }
2449b8ba 2970
49668688 2971 if (get_modinfo(info, "staging")) {
373d4d09 2972 add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK);
bddb12b3
AM
2973 pr_warn("%s: module is from the staging directory, the quality "
2974 "is unknown, you have been warned.\n", mod->name);
40dd2560 2975 }
22e268eb 2976
2992ef29 2977 err = check_modinfo_livepatch(mod, info);
1ce15ef4
JY
2978 if (err)
2979 return err;
2980
22e268eb 2981 /* Set up license info based on the info section */
49668688 2982 set_license(mod, get_modinfo(info, "license"));
22e268eb 2983
40dd2560
RR
2984 return 0;
2985}
2986
eb3057df 2987static int find_module_sections(struct module *mod, struct load_info *info)
f91a13bb 2988{
49668688 2989 mod->kp = section_objs(info, "__param",
f91a13bb 2990 sizeof(*mod->kp), &mod->num_kp);
49668688 2991 mod->syms = section_objs(info, "__ksymtab",
f91a13bb 2992 sizeof(*mod->syms), &mod->num_syms);
49668688
RR
2993 mod->crcs = section_addr(info, "__kcrctab");
2994 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
f91a13bb
LT
2995 sizeof(*mod->gpl_syms),
2996 &mod->num_gpl_syms);
49668688
RR
2997 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2998 mod->gpl_future_syms = section_objs(info,
f91a13bb
LT
2999 "__ksymtab_gpl_future",
3000 sizeof(*mod->gpl_future_syms),
3001 &mod->num_gpl_future_syms);
49668688 3002 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
f91a13bb
LT
3003
3004#ifdef CONFIG_UNUSED_SYMBOLS
49668688 3005 mod->unused_syms = section_objs(info, "__ksymtab_unused",
f91a13bb
LT
3006 sizeof(*mod->unused_syms),
3007 &mod->num_unused_syms);
49668688
RR
3008 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
3009 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
f91a13bb
LT
3010 sizeof(*mod->unused_gpl_syms),
3011 &mod->num_unused_gpl_syms);
49668688 3012 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
f91a13bb
LT
3013#endif
3014#ifdef CONFIG_CONSTRUCTORS
49668688 3015 mod->ctors = section_objs(info, ".ctors",
f91a13bb 3016 sizeof(*mod->ctors), &mod->num_ctors);
eb3057df
FH
3017 if (!mod->ctors)
3018 mod->ctors = section_objs(info, ".init_array",
3019 sizeof(*mod->ctors), &mod->num_ctors);
3020 else if (find_sec(info, ".init_array")) {
3021 /*
3022 * This shouldn't happen with same compiler and binutils
3023 * building all parts of the module.
3024 */
6da0b565 3025 pr_warn("%s: has both .ctors and .init_array.\n",
eb3057df
FH
3026 mod->name);
3027 return -EINVAL;
3028 }
f91a13bb
LT
3029#endif
3030
3031#ifdef CONFIG_TRACEPOINTS
65498646
MD
3032 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
3033 sizeof(*mod->tracepoints_ptrs),
3034 &mod->num_tracepoints);
f91a13bb 3035#endif
bf5438fc
JB
3036#ifdef HAVE_JUMP_LABEL
3037 mod->jump_entries = section_objs(info, "__jump_table",
3038 sizeof(*mod->jump_entries),
3039 &mod->num_jump_entries);
3040#endif
f91a13bb 3041#ifdef CONFIG_EVENT_TRACING
49668688 3042 mod->trace_events = section_objs(info, "_ftrace_events",
f91a13bb
LT
3043 sizeof(*mod->trace_events),
3044 &mod->num_trace_events);
3673b8e4
SRRH
3045 mod->trace_enums = section_objs(info, "_ftrace_enum_map",
3046 sizeof(*mod->trace_enums),
3047 &mod->num_trace_enums);
f91a13bb 3048#endif
13b9b6e7
SR
3049#ifdef CONFIG_TRACING
3050 mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
3051 sizeof(*mod->trace_bprintk_fmt_start),
3052 &mod->num_trace_bprintk_fmt);
13b9b6e7 3053#endif
f91a13bb
LT
3054#ifdef CONFIG_FTRACE_MCOUNT_RECORD
3055 /* sechdrs[0].sh_size is always zero */
49668688 3056 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
f91a13bb
LT
3057 sizeof(*mod->ftrace_callsites),
3058 &mod->num_ftrace_callsites);
3059#endif
22e268eb 3060
811d66a0
RR
3061 mod->extable = section_objs(info, "__ex_table",
3062 sizeof(*mod->extable), &mod->num_exentries);
3063
49668688 3064 if (section_addr(info, "__obsparm"))
bddb12b3 3065 pr_warn("%s: Ignoring obsolete parameters\n", mod->name);
811d66a0
RR
3066
3067 info->debug = section_objs(info, "__verbose",
3068 sizeof(*info->debug), &info->num_debug);
eb3057df
FH
3069
3070 return 0;
f91a13bb
LT
3071}
3072
49668688 3073static int move_module(struct module *mod, struct load_info *info)
65b8a9b4
LT
3074{
3075 int i;
3076 void *ptr;
3077
3078 /* Do the allocs. */
7523e4dc 3079 ptr = module_alloc(mod->core_layout.size);
65b8a9b4
LT
3080 /*
3081 * The pointer to this block is stored in the module structure
3082 * which is inside the block. Just mark it as not being a
3083 * leak.
3084 */
3085 kmemleak_not_leak(ptr);
3086 if (!ptr)
d913188c 3087 return -ENOMEM;
65b8a9b4 3088
7523e4dc
RR
3089 memset(ptr, 0, mod->core_layout.size);
3090 mod->core_layout.base = ptr;
65b8a9b4 3091
7523e4dc
RR
3092 if (mod->init_layout.size) {
3093 ptr = module_alloc(mod->init_layout.size);
82fab442
RR
3094 /*
3095 * The pointer to this block is stored in the module structure
3096 * which is inside the block. This block doesn't need to be
3097 * scanned as it contains data and code that will be freed
3098 * after the module is initialized.
3099 */
3100 kmemleak_ignore(ptr);
3101 if (!ptr) {
7523e4dc 3102 module_memfree(mod->core_layout.base);
82fab442
RR
3103 return -ENOMEM;
3104 }
7523e4dc
RR
3105 memset(ptr, 0, mod->init_layout.size);
3106 mod->init_layout.base = ptr;
82fab442 3107 } else
7523e4dc 3108 mod->init_layout.base = NULL;
65b8a9b4
LT
3109
3110 /* Transfer each section which specifies SHF_ALLOC */
5e124169 3111 pr_debug("final section addresses:\n");
49668688 3112 for (i = 0; i < info->hdr->e_shnum; i++) {
65b8a9b4 3113 void *dest;
49668688 3114 Elf_Shdr *shdr = &info->sechdrs[i];
65b8a9b4 3115
49668688 3116 if (!(shdr->sh_flags & SHF_ALLOC))
65b8a9b4
LT
3117 continue;
3118
49668688 3119 if (shdr->sh_entsize & INIT_OFFSET_MASK)
7523e4dc 3120 dest = mod->init_layout.base
49668688 3121 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
65b8a9b4 3122 else
7523e4dc 3123 dest = mod->core_layout.base + shdr->sh_entsize;
65b8a9b4 3124
49668688
RR
3125 if (shdr->sh_type != SHT_NOBITS)
3126 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
65b8a9b4 3127 /* Update sh_addr to point to copy in image. */
49668688 3128 shdr->sh_addr = (unsigned long)dest;
5e124169
JC
3129 pr_debug("\t0x%lx %s\n",
3130 (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
65b8a9b4 3131 }
d913188c
RR
3132
3133 return 0;
65b8a9b4
LT
3134}
3135
49668688 3136static int check_module_license_and_versions(struct module *mod)
22e268eb 3137{
3205c36c
LP
3138 int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE);
3139
22e268eb
RR
3140 /*
3141 * ndiswrapper is under GPL by itself, but loads proprietary modules.
3142 * Don't use add_taint_module(), as it would prevent ndiswrapper from
3143 * using GPL-only symbols it needs.
3144 */
3145 if (strcmp(mod->name, "ndiswrapper") == 0)
373d4d09 3146 add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE);
22e268eb
RR
3147
3148 /* driverloader was caught wrongly pretending to be under GPL */
3149 if (strcmp(mod->name, "driverloader") == 0)
373d4d09
RR
3150 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
3151 LOCKDEP_NOW_UNRELIABLE);
22e268eb 3152
c99af375
MG
3153 /* lve claims to be GPL but upstream won't provide source */
3154 if (strcmp(mod->name, "lve") == 0)
373d4d09
RR
3155 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
3156 LOCKDEP_NOW_UNRELIABLE);
c99af375 3157
3205c36c
LP
3158 if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE))
3159 pr_warn("%s: module license taints kernel.\n", mod->name);
3160
22e268eb
RR
3161#ifdef CONFIG_MODVERSIONS
3162 if ((mod->num_syms && !mod->crcs)
3163 || (mod->num_gpl_syms && !mod->gpl_crcs)
3164 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
3165#ifdef CONFIG_UNUSED_SYMBOLS
3166 || (mod->num_unused_syms && !mod->unused_crcs)
3167 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
3168#endif
3169 ) {
3170 return try_to_force_load(mod,
3171 "no versions for exported symbols");
3172 }
3173#endif
3174 return 0;
3175}
3176
3177static void flush_module_icache(const struct module *mod)
3178{
3179 mm_segment_t old_fs;
3180
3181 /* flush the icache in correct context */
3182 old_fs = get_fs();
3183 set_fs(KERNEL_DS);
3184
3185 /*
3186 * Flush the instruction cache, since we've played with text.
3187 * Do it before processing of module parameters, so the module
3188 * can provide parameter accessor functions of its own.
3189 */
7523e4dc
RR
3190 if (mod->init_layout.base)
3191 flush_icache_range((unsigned long)mod->init_layout.base,
3192 (unsigned long)mod->init_layout.base
3193 + mod->init_layout.size);
3194 flush_icache_range((unsigned long)mod->core_layout.base,
3195 (unsigned long)mod->core_layout.base + mod->core_layout.size);
22e268eb
RR
3196
3197 set_fs(old_fs);
3198}
3199
74e08fcf
JB
3200int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
3201 Elf_Shdr *sechdrs,
3202 char *secstrings,
3203 struct module *mod)
3204{
3205 return 0;
3206}
3207
be7de5f9
PB
3208/* module_blacklist is a comma-separated list of module names */
3209static char *module_blacklist;
3210static bool blacklisted(char *module_name)
3211{
3212 const char *p;
3213 size_t len;
3214
3215 if (!module_blacklist)
3216 return false;
3217
3218 for (p = module_blacklist; *p; p += len) {
3219 len = strcspn(p, ",");
3220 if (strlen(module_name) == len && !memcmp(module_name, p, len))
3221 return true;
3222 if (p[len] == ',')
3223 len++;
3224 }
3225 return false;
3226}
3227core_param(module_blacklist, module_blacklist, charp, 0400);
3228
2f3238ae 3229static struct module *layout_and_allocate(struct load_info *info, int flags)
1da177e4 3230{
d913188c 3231 /* Module within temporary copy. */
1da177e4 3232 struct module *mod;
444d13ff 3233 unsigned int ndx;
d913188c 3234 int err;
3ae91c21 3235
2f3238ae 3236 mod = setup_load_info(info, flags);
d913188c
RR
3237 if (IS_ERR(mod))
3238 return mod;
1da177e4 3239
be7de5f9
PB
3240 if (blacklisted(mod->name))
3241 return ERR_PTR(-EPERM);
3242
2f3238ae 3243 err = check_modinfo(mod, info, flags);
40dd2560
RR
3244 if (err)
3245 return ERR_PTR(err);
1da177e4 3246
1da177e4 3247 /* Allow arches to frob section contents and sizes. */
49668688
RR
3248 err = module_frob_arch_sections(info->hdr, info->sechdrs,
3249 info->secstrings, mod);
1da177e4 3250 if (err < 0)
8d8022e8 3251 return ERR_PTR(err);
1da177e4 3252
8d8022e8
RR
3253 /* We will do a special allocation for per-cpu sections later. */
3254 info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC;
1da177e4 3255
444d13ff
JY
3256 /*
3257 * Mark ro_after_init section with SHF_RO_AFTER_INIT so that
3258 * layout_sections() can put it in the right place.
3259 * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set.
3260 */
3261 ndx = find_sec(info, ".data..ro_after_init");
3262 if (ndx)
3263 info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT;
3264
1da177e4
LT
3265 /* Determine total sizes, and put offsets in sh_entsize. For now
3266 this is done generically; there doesn't appear to be any
3267 special cases for the architectures. */
49668688 3268 layout_sections(mod, info);
49668688 3269 layout_symtab(mod, info);
1da177e4 3270
65b8a9b4 3271 /* Allocate and move to the final place */
49668688 3272 err = move_module(mod, info);
d913188c 3273 if (err)
8d8022e8 3274 return ERR_PTR(err);
d913188c
RR
3275
3276 /* Module has been copied to its final place now: return it. */
3277 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
49668688 3278 kmemleak_load_module(mod, info);
d913188c 3279 return mod;
d913188c
RR
3280}
3281
3282/* mod is no longer valid after this! */
3283static void module_deallocate(struct module *mod, struct load_info *info)
3284{
d913188c 3285 percpu_modfree(mod);
d453cded 3286 module_arch_freeing_init(mod);
7523e4dc
RR
3287 module_memfree(mod->init_layout.base);
3288 module_memfree(mod->core_layout.base);
d913188c
RR
3289}
3290
74e08fcf
JB
3291int __weak module_finalize(const Elf_Ehdr *hdr,
3292 const Elf_Shdr *sechdrs,
3293 struct module *me)
3294{
3295 return 0;
3296}
3297
811d66a0
RR
3298static int post_relocation(struct module *mod, const struct load_info *info)
3299{
51f3d0f4 3300 /* Sort exception table now relocations are done. */
811d66a0
RR
3301 sort_extable(mod->extable, mod->extable + mod->num_exentries);
3302
3303 /* Copy relocated percpu area over. */
3304 percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
3305 info->sechdrs[info->index.pcpu].sh_size);
3306
51f3d0f4 3307 /* Setup kallsyms-specific fields. */
811d66a0
RR
3308 add_kallsyms(mod, info);
3309
3310 /* Arch-specific module finalizing. */
3311 return module_finalize(info->hdr, info->sechdrs, mod);
3312}
3313
9bb9c3be
RR
3314/* Is this module of this name done loading? No locks held. */
3315static bool finished_loading(const char *name)
3316{
3317 struct module *mod;
3318 bool ret;
3319
9cc019b8
PZ
3320 /*
3321 * The module_mutex should not be a heavily contended lock;
3322 * if we get the occasional sleep here, we'll go an extra iteration
3323 * in the wait_event_interruptible(), which is harmless.
3324 */
3325 sched_annotate_sleep();
9bb9c3be 3326 mutex_lock(&module_mutex);
4f6de4d5 3327 mod = find_module_all(name, strlen(name), true);
0d21b0e3
RR
3328 ret = !mod || mod->state == MODULE_STATE_LIVE
3329 || mod->state == MODULE_STATE_GOING;
9bb9c3be
RR
3330 mutex_unlock(&module_mutex);
3331
3332 return ret;
3333}
3334
34e1169d
KC
3335/* Call module constructors. */
3336static void do_mod_ctors(struct module *mod)
3337{
3338#ifdef CONFIG_CONSTRUCTORS
3339 unsigned long i;
3340
3341 for (i = 0; i < mod->num_ctors; i++)
3342 mod->ctors[i]();
3343#endif
3344}
3345
c7496379
RR
3346/* For freeing module_init on success, in case kallsyms traversing */
3347struct mod_initfree {
3348 struct rcu_head rcu;
3349 void *module_init;
3350};
3351
3352static void do_free_init(struct rcu_head *head)
3353{
3354 struct mod_initfree *m = container_of(head, struct mod_initfree, rcu);
3355 module_memfree(m->module_init);
3356 kfree(m);
3357}
3358
be02a186
JK
3359/*
3360 * This is where the real work happens.
3361 *
3362 * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb
3363 * helper command 'lx-symbols'.
3364 */
3365static noinline int do_init_module(struct module *mod)
34e1169d
KC
3366{
3367 int ret = 0;
c7496379
RR
3368 struct mod_initfree *freeinit;
3369
3370 freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL);
3371 if (!freeinit) {
3372 ret = -ENOMEM;
3373 goto fail;
3374 }
7523e4dc 3375 freeinit->module_init = mod->init_layout.base;
34e1169d 3376
774a1221
TH
3377 /*
3378 * We want to find out whether @mod uses async during init. Clear
3379 * PF_USED_ASYNC. async_schedule*() will set it.
3380 */
3381 current->flags &= ~PF_USED_ASYNC;
3382
34e1169d
KC
3383 do_mod_ctors(mod);
3384 /* Start the module */
3385 if (mod->init != NULL)
3386 ret = do_one_initcall(mod->init);
3387 if (ret < 0) {
c7496379 3388 goto fail_free_freeinit;
34e1169d
KC
3389 }
3390 if (ret > 0) {
bddb12b3
AM
3391 pr_warn("%s: '%s'->init suspiciously returned %d, it should "
3392 "follow 0/-E convention\n"
3393 "%s: loading module anyway...\n",
3394 __func__, mod->name, ret, __func__);
34e1169d
KC
3395 dump_stack();
3396 }
3397
3398 /* Now it's a first class citizen! */
3399 mod->state = MODULE_STATE_LIVE;
3400 blocking_notifier_call_chain(&module_notify_list,
3401 MODULE_STATE_LIVE, mod);
3402
774a1221
TH
3403 /*
3404 * We need to finish all async code before the module init sequence
3405 * is done. This has potential to deadlock. For example, a newly
3406 * detected block device can trigger request_module() of the
3407 * default iosched from async probing task. Once userland helper
3408 * reaches here, async_synchronize_full() will wait on the async
3409 * task waiting on request_module() and deadlock.
3410 *
3411 * This deadlock is avoided by perfomring async_synchronize_full()
3412 * iff module init queued any async jobs. This isn't a full
3413 * solution as it will deadlock the same if module loading from
3414 * async jobs nests more than once; however, due to the various
3415 * constraints, this hack seems to be the best option for now.
3416 * Please refer to the following thread for details.
3417 *
3418 * http://thread.gmane.org/gmane.linux.kernel/1420814
3419 */
f2411da7 3420 if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC))
774a1221 3421 async_synchronize_full();
34e1169d
KC
3422
3423 mutex_lock(&module_mutex);
3424 /* Drop initial reference. */
3425 module_put(mod);
3426 trim_init_extable(mod);
3427#ifdef CONFIG_KALLSYMS
8244062e
RR
3428 /* Switch to core kallsyms now init is done: kallsyms may be walking! */
3429 rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms);
34e1169d 3430#endif
444d13ff 3431 module_enable_ro(mod, true);
93c2e105 3432 mod_tree_remove_init(mod);
85c898db 3433 disable_ro_nx(&mod->init_layout);
d453cded 3434 module_arch_freeing_init(mod);
7523e4dc
RR
3435 mod->init_layout.base = NULL;
3436 mod->init_layout.size = 0;
3437 mod->init_layout.ro_size = 0;
444d13ff 3438 mod->init_layout.ro_after_init_size = 0;
7523e4dc 3439 mod->init_layout.text_size = 0;
c7496379
RR
3440 /*
3441 * We want to free module_init, but be aware that kallsyms may be
0be964be
PZ
3442 * walking this with preempt disabled. In all the failure paths, we
3443 * call synchronize_sched(), but we don't want to slow down the success
3444 * path, so use actual RCU here.
c7496379 3445 */
0be964be 3446 call_rcu_sched(&freeinit->rcu, do_free_init);
34e1169d
KC
3447 mutex_unlock(&module_mutex);
3448 wake_up_all(&module_wq);
3449
3450 return 0;
c7496379
RR
3451
3452fail_free_freeinit:
3453 kfree(freeinit);
3454fail:
3455 /* Try to protect us from buggy refcounters. */
3456 mod->state = MODULE_STATE_GOING;
3457 synchronize_sched();
3458 module_put(mod);
3459 blocking_notifier_call_chain(&module_notify_list,
3460 MODULE_STATE_GOING, mod);
7e545d6e 3461 klp_module_going(mod);
7dcd182b 3462 ftrace_release_mod(mod);
c7496379
RR
3463 free_module(mod);
3464 wake_up_all(&module_wq);
3465 return ret;
34e1169d
KC
3466}
3467
3468static int may_init_module(void)
3469{
3470 if (!capable(CAP_SYS_MODULE) || modules_disabled)
3471 return -EPERM;
3472
3473 return 0;
3474}
3475
a3535c7e
RR
3476/*
3477 * We try to place it in the list now to make sure it's unique before
3478 * we dedicate too many resources. In particular, temporary percpu
3479 * memory exhaustion.
3480 */
3481static int add_unformed_module(struct module *mod)
3482{
3483 int err;
3484 struct module *old;
3485
3486 mod->state = MODULE_STATE_UNFORMED;
3487
3488again:
3489 mutex_lock(&module_mutex);
4f6de4d5
MK
3490 old = find_module_all(mod->name, strlen(mod->name), true);
3491 if (old != NULL) {
a3535c7e
RR
3492 if (old->state == MODULE_STATE_COMING
3493 || old->state == MODULE_STATE_UNFORMED) {
3494 /* Wait in case it fails to load. */
3495 mutex_unlock(&module_mutex);
9cc019b8
PZ
3496 err = wait_event_interruptible(module_wq,
3497 finished_loading(mod->name));
a3535c7e
RR
3498 if (err)
3499 goto out_unlocked;
3500 goto again;
3501 }
3502 err = -EEXIST;
3503 goto out;
3504 }
4f666546 3505 mod_update_bounds(mod);
a3535c7e 3506 list_add_rcu(&mod->list, &modules);
93c2e105 3507 mod_tree_insert(mod);
a3535c7e
RR
3508 err = 0;
3509
3510out:
3511 mutex_unlock(&module_mutex);
3512out_unlocked:
3513 return err;
3514}
3515
3516static int complete_formation(struct module *mod, struct load_info *info)
3517{
3518 int err;
3519
3520 mutex_lock(&module_mutex);
3521
3522 /* Find duplicate symbols (must be called under lock). */
3523 err = verify_export_symbols(mod);
3524 if (err < 0)
3525 goto out;
3526
3527 /* This relies on module_mutex for list integrity. */
3528 module_bug_finalize(info->hdr, info->sechdrs, mod);
3529
444d13ff 3530 module_enable_ro(mod, false);
85c898db 3531 module_enable_nx(mod);
4982223e 3532
a3535c7e
RR
3533 /* Mark state as coming so strong_try_module_get() ignores us,
3534 * but kallsyms etc. can see us. */
3535 mod->state = MODULE_STATE_COMING;
4982223e
RR
3536 mutex_unlock(&module_mutex);
3537
4982223e 3538 return 0;
a3535c7e
RR
3539
3540out:
3541 mutex_unlock(&module_mutex);
3542 return err;
3543}
3544
4c973d16
JY
3545static int prepare_coming_module(struct module *mod)
3546{
7e545d6e
JY
3547 int err;
3548
4c973d16 3549 ftrace_module_enable(mod);
7e545d6e
JY
3550 err = klp_module_coming(mod);
3551 if (err)
3552 return err;
3553
4c973d16
JY
3554 blocking_notifier_call_chain(&module_notify_list,
3555 MODULE_STATE_COMING, mod);
3556 return 0;
3557}
3558
ecc86170
LR
3559static int unknown_module_param_cb(char *param, char *val, const char *modname,
3560 void *arg)
54041d8a 3561{
f2411da7
LR
3562 struct module *mod = arg;
3563 int ret;
3564
3565 if (strcmp(param, "async_probe") == 0) {
3566 mod->async_probe_requested = true;
3567 return 0;
3568 }
3569
6da0b565 3570 /* Check for magic 'dyndbg' arg */
f2411da7 3571 ret = ddebug_dyndbg_module_param_cb(param, val, modname);
bddb12b3
AM
3572 if (ret != 0)
3573 pr_warn("%s: unknown parameter '%s' ignored\n", modname, param);
54041d8a
RR
3574 return 0;
3575}
3576
d913188c
RR
3577/* Allocate and load the module: note that size of section 0 is always
3578 zero, and we rely on this for optional sections. */
2f3238ae
RR
3579static int load_module(struct load_info *info, const char __user *uargs,
3580 int flags)
d913188c 3581{
a3535c7e 3582 struct module *mod;
d913188c 3583 long err;
51e158c1 3584 char *after_dashes;
d913188c 3585
bca014ca 3586 err = module_sig_check(info, flags);
34e1169d
KC
3587 if (err)
3588 goto free_copy;
d913188c 3589
34e1169d 3590 err = elf_header_check(info);
d913188c 3591 if (err)
34e1169d 3592 goto free_copy;
d913188c
RR
3593
3594 /* Figure out module layout, and allocate all the memory. */
2f3238ae 3595 mod = layout_and_allocate(info, flags);
65b8a9b4
LT
3596 if (IS_ERR(mod)) {
3597 err = PTR_ERR(mod);
d913188c 3598 goto free_copy;
1da177e4 3599 }
1da177e4 3600
a3535c7e
RR
3601 /* Reserve our place in the list. */
3602 err = add_unformed_module(mod);
3603 if (err)
1fb9341a 3604 goto free_module;
1fb9341a 3605
106a4ee2 3606#ifdef CONFIG_MODULE_SIG
34e1169d 3607 mod->sig_ok = info->sig_ok;
64748a2c 3608 if (!mod->sig_ok) {
bddb12b3 3609 pr_notice_once("%s: module verification failed: signature "
ab92ebbb 3610 "and/or required key missing - tainting "
bddb12b3 3611 "kernel\n", mod->name);
66cc69e3 3612 add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK);
64748a2c 3613 }
106a4ee2
RR
3614#endif
3615
8d8022e8 3616 /* To avoid stressing percpu allocator, do this once we're unique. */
9eb76d77 3617 err = percpu_modalloc(mod, info);
8d8022e8
RR
3618 if (err)
3619 goto unlink_mod;
3620
49668688 3621 /* Now module is in final location, initialize linked lists, etc. */
9f85a4bb
RR
3622 err = module_unload_init(mod);
3623 if (err)
1fb9341a 3624 goto unlink_mod;
1da177e4 3625
cf2fde7b 3626 init_param_lock(mod);
b51d23e4 3627
22e268eb
RR
3628 /* Now we've got everything in the final locations, we can
3629 * find optional sections. */
eb3057df
FH
3630 err = find_module_sections(mod, info);
3631 if (err)
3632 goto free_unload;
9b37ccfc 3633
49668688 3634 err = check_module_license_and_versions(mod);
22e268eb
RR
3635 if (err)
3636 goto free_unload;
9841d61d 3637
c988d2b2 3638 /* Set up MODINFO_ATTR fields */
34e1169d 3639 setup_modinfo(mod, info);
c988d2b2 3640
1da177e4 3641 /* Fix up syms, so that st_value is a pointer to location. */
34e1169d 3642 err = simplify_symbols(mod, info);
1da177e4 3643 if (err < 0)
d913188c 3644 goto free_modinfo;
1da177e4 3645
34e1169d 3646 err = apply_relocations(mod, info);
22e268eb 3647 if (err < 0)
d913188c 3648 goto free_modinfo;
1da177e4 3649
34e1169d 3650 err = post_relocation(mod, info);
1da177e4 3651 if (err < 0)
d913188c 3652 goto free_modinfo;
1da177e4 3653
22e268eb 3654 flush_module_icache(mod);
378bac82 3655
6526c534
RR
3656 /* Now copy in args */
3657 mod->args = strndup_user(uargs, ~0UL >> 1);
3658 if (IS_ERR(mod->args)) {
3659 err = PTR_ERR(mod->args);
3660 goto free_arch_cleanup;
3661 }
8d3b33f6 3662
34e1169d 3663 dynamic_debug_setup(info->debug, info->num_debug);
ff49d74a 3664
a949ae56
SRRH
3665 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3666 ftrace_module_init(mod);
3667
a3535c7e
RR
3668 /* Finally it's fully formed, ready to start executing. */
3669 err = complete_formation(mod, info);
3670 if (err)
1fb9341a 3671 goto ddebug_cleanup;
be593f4c 3672
4c973d16
JY
3673 err = prepare_coming_module(mod);
3674 if (err)
3675 goto bug_cleanup;
3676
51f3d0f4 3677 /* Module is ready to execute: parsing args may do that. */
51e158c1 3678 after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
4355efbd 3679 -32768, 32767, mod,
ecc86170 3680 unknown_module_param_cb);
51e158c1
RR
3681 if (IS_ERR(after_dashes)) {
3682 err = PTR_ERR(after_dashes);
4c973d16 3683 goto coming_cleanup;
51e158c1
RR
3684 } else if (after_dashes) {
3685 pr_warn("%s: parameters '%s' after `--' ignored\n",
3686 mod->name, after_dashes);
3687 }
1da177e4 3688
51f3d0f4 3689 /* Link in to syfs. */
34e1169d 3690 err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
1da177e4 3691 if (err < 0)
4c973d16 3692 goto coming_cleanup;
80a3d1bb 3693
1ce15ef4
JY
3694 if (is_livepatch_module(mod)) {
3695 err = copy_module_elf(mod, info);
3696 if (err < 0)
3697 goto sysfs_cleanup;
3698 }
3699
48fd1188 3700 /* Get rid of temporary copy. */
34e1169d 3701 free_copy(info);
1da177e4
LT
3702
3703 /* Done! */
51f3d0f4 3704 trace_module_load(mod);
34e1169d
KC
3705
3706 return do_init_module(mod);
1da177e4 3707
1ce15ef4
JY
3708 sysfs_cleanup:
3709 mod_sysfs_teardown(mod);
4c973d16
JY
3710 coming_cleanup:
3711 blocking_notifier_call_chain(&module_notify_list,
3712 MODULE_STATE_GOING, mod);
7e545d6e 3713 klp_module_going(mod);
1fb9341a
RR
3714 bug_cleanup:
3715 /* module_bug_cleanup needs module_mutex protection */
75676500 3716 mutex_lock(&module_mutex);
5336377d 3717 module_bug_cleanup(mod);
ee61abb3 3718 mutex_unlock(&module_mutex);
ff7e0055
AL
3719
3720 /* we can't deallocate the module until we clear memory protection */
85c898db
RR
3721 module_disable_ro(mod);
3722 module_disable_nx(mod);
ff7e0055 3723
a3535c7e 3724 ddebug_cleanup:
1fb9341a 3725 dynamic_debug_remove(info->debug);
e91defa2 3726 synchronize_sched();
6526c534
RR
3727 kfree(mod->args);
3728 free_arch_cleanup:
1da177e4 3729 module_arch_cleanup(mod);
d913188c 3730 free_modinfo:
a263f776 3731 free_modinfo(mod);
22e268eb 3732 free_unload:
1da177e4 3733 module_unload_free(mod);
1fb9341a
RR
3734 unlink_mod:
3735 mutex_lock(&module_mutex);
3736 /* Unlink carefully: kallsyms could be walking list. */
3737 list_del_rcu(&mod->list);
758556bd 3738 mod_tree_remove(mod);
1fb9341a 3739 wake_up_all(&module_wq);
0be964be
PZ
3740 /* Wait for RCU-sched synchronizing before releasing mod->list. */
3741 synchronize_sched();
1fb9341a 3742 mutex_unlock(&module_mutex);
d913188c 3743 free_module:
049fb9bd
SRRH
3744 /*
3745 * Ftrace needs to clean up what it initialized.
3746 * This does nothing if ftrace_module_init() wasn't called,
3747 * but it must be called outside of module_mutex.
3748 */
3749 ftrace_release_mod(mod);
35a9393c 3750 /* Free lock-classes; relies on the preceding sync_rcu() */
7523e4dc 3751 lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size);
35a9393c 3752
34e1169d 3753 module_deallocate(mod, info);
d913188c 3754 free_copy:
34e1169d
KC
3755 free_copy(info);
3756 return err;
b99b87f7
PO
3757}
3758
17da2bd9
HC
3759SYSCALL_DEFINE3(init_module, void __user *, umod,
3760 unsigned long, len, const char __user *, uargs)
1da177e4 3761{
34e1169d
KC
3762 int err;
3763 struct load_info info = { };
1da177e4 3764
34e1169d
KC
3765 err = may_init_module();
3766 if (err)
3767 return err;
1da177e4 3768
34e1169d
KC
3769 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3770 umod, len, uargs);
1da177e4 3771
34e1169d
KC
3772 err = copy_module_from_user(umod, len, &info);
3773 if (err)
3774 return err;
1da177e4 3775
2f3238ae 3776 return load_module(&info, uargs, 0);
34e1169d 3777}
94462ad3 3778
2f3238ae 3779SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
34e1169d 3780{
34e1169d 3781 struct load_info info = { };
a1db7420
MZ
3782 loff_t size;
3783 void *hdr;
3784 int err;
94462ad3 3785
34e1169d
KC
3786 err = may_init_module();
3787 if (err)
3788 return err;
1da177e4 3789
2f3238ae 3790 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags);
6c5db22d 3791
2f3238ae
RR
3792 if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS
3793 |MODULE_INIT_IGNORE_VERMAGIC))
3794 return -EINVAL;
d6de2c80 3795
a1db7420
MZ
3796 err = kernel_read_file_from_fd(fd, &hdr, &size, INT_MAX,
3797 READING_MODULE);
34e1169d
KC
3798 if (err)
3799 return err;
a1db7420
MZ
3800 info.hdr = hdr;
3801 info.len = size;
1da177e4 3802
2f3238ae 3803 return load_module(&info, uargs, flags);
1da177e4
LT
3804}
3805
3806static inline int within(unsigned long addr, void *start, unsigned long size)
3807{
3808 return ((void *)addr >= start && (void *)addr < start + size);
3809}
3810
3811#ifdef CONFIG_KALLSYMS
3812/*
3813 * This ignores the intensely annoying "mapping symbols" found
3814 * in ARM ELF files: $a, $t and $d.
3815 */
3816static inline int is_arm_mapping_symbol(const char *str)
3817{
2e3a10a1
RK
3818 if (str[0] == '.' && str[1] == 'L')
3819 return true;
6c34f1f5 3820 return str[0] == '$' && strchr("axtd", str[1])
1da177e4
LT
3821 && (str[2] == '\0' || str[2] == '.');
3822}
3823
8244062e 3824static const char *symname(struct mod_kallsyms *kallsyms, unsigned int symnum)
2e7bac53 3825{
8244062e 3826 return kallsyms->strtab + kallsyms->symtab[symnum].st_name;
2e7bac53
RR
3827}
3828
1da177e4
LT
3829static const char *get_ksymbol(struct module *mod,
3830 unsigned long addr,
3831 unsigned long *size,
3832 unsigned long *offset)
3833{
3834 unsigned int i, best = 0;
3835 unsigned long nextval;
8244062e 3836 struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms);
1da177e4
LT
3837
3838 /* At worse, next value is at end of module */
a06f6211 3839 if (within_module_init(addr, mod))
7523e4dc 3840 nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size;
22a8bdeb 3841 else
7523e4dc 3842 nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size;
1da177e4 3843
25985edc 3844 /* Scan for closest preceding symbol, and next symbol. (ELF
22a8bdeb 3845 starts real symbols at 1). */
8244062e
RR
3846 for (i = 1; i < kallsyms->num_symtab; i++) {
3847 if (kallsyms->symtab[i].st_shndx == SHN_UNDEF)
1da177e4
LT
3848 continue;
3849
3850 /* We ignore unnamed symbols: they're uninformative
3851 * and inserted at a whim. */
8244062e
RR
3852 if (*symname(kallsyms, i) == '\0'
3853 || is_arm_mapping_symbol(symname(kallsyms, i)))
2e7bac53
RR
3854 continue;
3855
8244062e
RR
3856 if (kallsyms->symtab[i].st_value <= addr
3857 && kallsyms->symtab[i].st_value > kallsyms->symtab[best].st_value)
1da177e4 3858 best = i;
8244062e
RR
3859 if (kallsyms->symtab[i].st_value > addr
3860 && kallsyms->symtab[i].st_value < nextval)
3861 nextval = kallsyms->symtab[i].st_value;
1da177e4
LT
3862 }
3863
3864 if (!best)
3865 return NULL;
3866
ffb45122 3867 if (size)
8244062e 3868 *size = nextval - kallsyms->symtab[best].st_value;
ffb45122 3869 if (offset)
8244062e
RR
3870 *offset = addr - kallsyms->symtab[best].st_value;
3871 return symname(kallsyms, best);
1da177e4
LT
3872}
3873
6dd06c9f
RR
3874/* For kallsyms to ask for address resolution. NULL means not found. Careful
3875 * not to lock to avoid deadlock on oopses, simply disable preemption. */
92dfc9dc 3876const char *module_address_lookup(unsigned long addr,
6dd06c9f
RR
3877 unsigned long *size,
3878 unsigned long *offset,
3879 char **modname,
3880 char *namebuf)
1da177e4 3881{
cb2a5205 3882 const char *ret = NULL;
b7df4d1b 3883 struct module *mod;
1da177e4 3884
cb2a5205 3885 preempt_disable();
b7df4d1b
PZ
3886 mod = __module_address(addr);
3887 if (mod) {
3888 if (modname)
3889 *modname = mod->name;
3890 ret = get_ksymbol(mod, addr, size, offset);
1da177e4 3891 }
6dd06c9f
RR
3892 /* Make a copy in here where it's safe */
3893 if (ret) {
3894 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
3895 ret = namebuf;
3896 }
cb2a5205 3897 preempt_enable();
b7df4d1b 3898
92dfc9dc 3899 return ret;
1da177e4
LT
3900}
3901
9d65cb4a
AD
3902int lookup_module_symbol_name(unsigned long addr, char *symname)
3903{
3904 struct module *mod;
3905
cb2a5205 3906 preempt_disable();
d72b3751 3907 list_for_each_entry_rcu(mod, &modules, list) {
0d21b0e3
RR
3908 if (mod->state == MODULE_STATE_UNFORMED)
3909 continue;
9b20a352 3910 if (within_module(addr, mod)) {
9d65cb4a
AD
3911 const char *sym;
3912
3913 sym = get_ksymbol(mod, addr, NULL, NULL);
3914 if (!sym)
3915 goto out;
9281acea 3916 strlcpy(symname, sym, KSYM_NAME_LEN);
cb2a5205 3917 preempt_enable();
9d65cb4a
AD
3918 return 0;
3919 }
3920 }
3921out:
cb2a5205 3922 preempt_enable();
9d65cb4a
AD
3923 return -ERANGE;
3924}
3925
a5c43dae
AD
3926int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
3927 unsigned long *offset, char *modname, char *name)
3928{
3929 struct module *mod;
3930
cb2a5205 3931 preempt_disable();
d72b3751 3932 list_for_each_entry_rcu(mod, &modules, list) {
0d21b0e3
RR
3933 if (mod->state == MODULE_STATE_UNFORMED)
3934 continue;
9b20a352 3935 if (within_module(addr, mod)) {
a5c43dae
AD
3936 const char *sym;
3937
3938 sym = get_ksymbol(mod, addr, size, offset);
3939 if (!sym)
3940 goto out;
3941 if (modname)
9281acea 3942 strlcpy(modname, mod->name, MODULE_NAME_LEN);
a5c43dae 3943 if (name)
9281acea 3944 strlcpy(name, sym, KSYM_NAME_LEN);
cb2a5205 3945 preempt_enable();
a5c43dae
AD
3946 return 0;
3947 }
3948 }
3949out:
cb2a5205 3950 preempt_enable();
a5c43dae
AD
3951 return -ERANGE;
3952}
3953
ea07890a
AD
3954int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3955 char *name, char *module_name, int *exported)
1da177e4
LT
3956{
3957 struct module *mod;
3958
cb2a5205 3959 preempt_disable();
d72b3751 3960 list_for_each_entry_rcu(mod, &modules, list) {
8244062e
RR
3961 struct mod_kallsyms *kallsyms;
3962
0d21b0e3
RR
3963 if (mod->state == MODULE_STATE_UNFORMED)
3964 continue;
8244062e
RR
3965 kallsyms = rcu_dereference_sched(mod->kallsyms);
3966 if (symnum < kallsyms->num_symtab) {
3967 *value = kallsyms->symtab[symnum].st_value;
3968 *type = kallsyms->symtab[symnum].st_info;
3969 strlcpy(name, symname(kallsyms, symnum), KSYM_NAME_LEN);
9281acea 3970 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
ca4787b7 3971 *exported = is_exported(name, *value, mod);
cb2a5205 3972 preempt_enable();
ea07890a 3973 return 0;
1da177e4 3974 }
8244062e 3975 symnum -= kallsyms->num_symtab;
1da177e4 3976 }
cb2a5205 3977 preempt_enable();
ea07890a 3978 return -ERANGE;
1da177e4
LT
3979}
3980
3981static unsigned long mod_find_symname(struct module *mod, const char *name)
3982{
3983 unsigned int i;
8244062e 3984 struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms);
1da177e4 3985
8244062e
RR
3986 for (i = 0; i < kallsyms->num_symtab; i++)
3987 if (strcmp(name, symname(kallsyms, i)) == 0 &&
3988 kallsyms->symtab[i].st_info != 'U')
3989 return kallsyms->symtab[i].st_value;
1da177e4
LT
3990 return 0;
3991}
3992
3993/* Look for this name: can be of form module:name. */
3994unsigned long module_kallsyms_lookup_name(const char *name)
3995{
3996 struct module *mod;
3997 char *colon;
3998 unsigned long ret = 0;
3999
4000 /* Don't lock: we're in enough trouble already. */
cb2a5205 4001 preempt_disable();
1da177e4 4002 if ((colon = strchr(name, ':')) != NULL) {
4f6de4d5 4003 if ((mod = find_module_all(name, colon - name, false)) != NULL)
1da177e4 4004 ret = mod_find_symname(mod, colon+1);
1da177e4 4005 } else {
0d21b0e3
RR
4006 list_for_each_entry_rcu(mod, &modules, list) {
4007 if (mod->state == MODULE_STATE_UNFORMED)
4008 continue;
1da177e4
LT
4009 if ((ret = mod_find_symname(mod, name)) != 0)
4010 break;
0d21b0e3 4011 }
1da177e4 4012 }
cb2a5205 4013 preempt_enable();
1da177e4
LT
4014 return ret;
4015}
75a66614
AK
4016
4017int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
4018 struct module *, unsigned long),
4019 void *data)
4020{
4021 struct module *mod;
4022 unsigned int i;
4023 int ret;
4024
0be964be
PZ
4025 module_assert_mutex();
4026
75a66614 4027 list_for_each_entry(mod, &modules, list) {
8244062e
RR
4028 /* We hold module_mutex: no need for rcu_dereference_sched */
4029 struct mod_kallsyms *kallsyms = mod->kallsyms;
4030
0d21b0e3
RR
4031 if (mod->state == MODULE_STATE_UNFORMED)
4032 continue;
8244062e
RR
4033 for (i = 0; i < kallsyms->num_symtab; i++) {
4034 ret = fn(data, symname(kallsyms, i),
4035 mod, kallsyms->symtab[i].st_value);
75a66614
AK
4036 if (ret != 0)
4037 return ret;
4038 }
4039 }
4040 return 0;
4041}
1da177e4
LT
4042#endif /* CONFIG_KALLSYMS */
4043
21aa9280 4044static char *module_flags(struct module *mod, char *buf)
fa3ba2e8
FM
4045{
4046 int bx = 0;
4047
0d21b0e3 4048 BUG_ON(mod->state == MODULE_STATE_UNFORMED);
21aa9280
AV
4049 if (mod->taints ||
4050 mod->state == MODULE_STATE_GOING ||
4051 mod->state == MODULE_STATE_COMING) {
fa3ba2e8 4052 buf[bx++] = '(';
cca3e707 4053 bx += module_flags_taint(mod, buf + bx);
21aa9280
AV
4054 /* Show a - for module-is-being-unloaded */
4055 if (mod->state == MODULE_STATE_GOING)
4056 buf[bx++] = '-';
4057 /* Show a + for module-is-being-loaded */
4058 if (mod->state == MODULE_STATE_COMING)
4059 buf[bx++] = '+';
fa3ba2e8
FM
4060 buf[bx++] = ')';
4061 }
4062 buf[bx] = '\0';
4063
4064 return buf;
4065}
4066
3b5d5c6b
AD
4067#ifdef CONFIG_PROC_FS
4068/* Called by the /proc file system to return a list of modules. */
4069static void *m_start(struct seq_file *m, loff_t *pos)
4070{
4071 mutex_lock(&module_mutex);
4072 return seq_list_start(&modules, *pos);
4073}
4074
4075static void *m_next(struct seq_file *m, void *p, loff_t *pos)
4076{
4077 return seq_list_next(p, &modules, pos);
4078}
4079
4080static void m_stop(struct seq_file *m, void *p)
4081{
4082 mutex_unlock(&module_mutex);
4083}
4084
1da177e4
LT
4085static int m_show(struct seq_file *m, void *p)
4086{
4087 struct module *mod = list_entry(p, struct module, list);
fa3ba2e8
FM
4088 char buf[8];
4089
0d21b0e3
RR
4090 /* We always ignore unformed modules. */
4091 if (mod->state == MODULE_STATE_UNFORMED)
4092 return 0;
4093
2f0f2a33 4094 seq_printf(m, "%s %u",
7523e4dc 4095 mod->name, mod->init_layout.size + mod->core_layout.size);
1da177e4
LT
4096 print_unload_info(m, mod);
4097
4098 /* Informative for users. */
4099 seq_printf(m, " %s",
6da0b565
IA
4100 mod->state == MODULE_STATE_GOING ? "Unloading" :
4101 mod->state == MODULE_STATE_COMING ? "Loading" :
1da177e4
LT
4102 "Live");
4103 /* Used by oprofile and other similar tools. */
7523e4dc 4104 seq_printf(m, " 0x%pK", mod->core_layout.base);
1da177e4 4105
fa3ba2e8
FM
4106 /* Taints info */
4107 if (mod->taints)
21aa9280 4108 seq_printf(m, " %s", module_flags(mod, buf));
fa3ba2e8 4109
6da0b565 4110 seq_puts(m, "\n");
1da177e4
LT
4111 return 0;
4112}
4113
4114/* Format: modulename size refcount deps address
4115
4116 Where refcount is a number or -, and deps is a comma-separated list
4117 of depends or -.
4118*/
3b5d5c6b 4119static const struct seq_operations modules_op = {
1da177e4
LT
4120 .start = m_start,
4121 .next = m_next,
4122 .stop = m_stop,
4123 .show = m_show
4124};
4125
3b5d5c6b
AD
4126static int modules_open(struct inode *inode, struct file *file)
4127{
4128 return seq_open(file, &modules_op);
4129}
4130
4131static const struct file_operations proc_modules_operations = {
4132 .open = modules_open,
4133 .read = seq_read,
4134 .llseek = seq_lseek,
4135 .release = seq_release,
4136};
4137
4138static int __init proc_modules_init(void)
4139{
4140 proc_create("modules", 0, NULL, &proc_modules_operations);
4141 return 0;
4142}
4143module_init(proc_modules_init);
4144#endif
4145
1da177e4
LT
4146/* Given an address, look for it in the module exception tables. */
4147const struct exception_table_entry *search_module_extables(unsigned long addr)
4148{
1da177e4
LT
4149 const struct exception_table_entry *e = NULL;
4150 struct module *mod;
4151
24da1cbf 4152 preempt_disable();
d72b3751 4153 list_for_each_entry_rcu(mod, &modules, list) {
0d21b0e3
RR
4154 if (mod->state == MODULE_STATE_UNFORMED)
4155 continue;
1da177e4
LT
4156 if (mod->num_exentries == 0)
4157 continue;
22a8bdeb 4158
1da177e4
LT
4159 e = search_extable(mod->extable,
4160 mod->extable + mod->num_exentries - 1,
4161 addr);
4162 if (e)
4163 break;
4164 }
24da1cbf 4165 preempt_enable();
1da177e4
LT
4166
4167 /* Now, if we found one, we are running inside it now, hence
22a8bdeb 4168 we cannot unload the module, hence no refcnt needed. */
1da177e4
LT
4169 return e;
4170}
4171
4d435f9d 4172/*
e610499e
RR
4173 * is_module_address - is this address inside a module?
4174 * @addr: the address to check.
4175 *
4176 * See is_module_text_address() if you simply want to see if the address
4177 * is code (not data).
4d435f9d 4178 */
e610499e 4179bool is_module_address(unsigned long addr)
4d435f9d 4180{
e610499e 4181 bool ret;
4d435f9d 4182
24da1cbf 4183 preempt_disable();
e610499e 4184 ret = __module_address(addr) != NULL;
24da1cbf 4185 preempt_enable();
4d435f9d 4186
e610499e 4187 return ret;
4d435f9d
IM
4188}
4189
e610499e
RR
4190/*
4191 * __module_address - get the module which contains an address.
4192 * @addr: the address.
4193 *
4194 * Must be called with preempt disabled or module mutex held so that
4195 * module doesn't get freed during this.
4196 */
714f83d5 4197struct module *__module_address(unsigned long addr)
1da177e4
LT
4198{
4199 struct module *mod;
4200
3a642e99
RR
4201 if (addr < module_addr_min || addr > module_addr_max)
4202 return NULL;
4203
0be964be
PZ
4204 module_assert_mutex_or_preempt();
4205
6c9692e2 4206 mod = mod_find(addr);
93c2e105
PZ
4207 if (mod) {
4208 BUG_ON(!within_module(addr, mod));
0d21b0e3 4209 if (mod->state == MODULE_STATE_UNFORMED)
93c2e105 4210 mod = NULL;
0d21b0e3 4211 }
93c2e105 4212 return mod;
1da177e4 4213}
c6b37801 4214EXPORT_SYMBOL_GPL(__module_address);
1da177e4 4215
e610499e
RR
4216/*
4217 * is_module_text_address - is this address inside module code?
4218 * @addr: the address to check.
4219 *
4220 * See is_module_address() if you simply want to see if the address is
4221 * anywhere in a module. See kernel_text_address() for testing if an
4222 * address corresponds to kernel or module code.
4223 */
4224bool is_module_text_address(unsigned long addr)
4225{
4226 bool ret;
4227
4228 preempt_disable();
4229 ret = __module_text_address(addr) != NULL;
4230 preempt_enable();
4231
4232 return ret;
4233}
4234
4235/*
4236 * __module_text_address - get the module whose code contains an address.
4237 * @addr: the address.
4238 *
4239 * Must be called with preempt disabled or module mutex held so that
4240 * module doesn't get freed during this.
4241 */
4242struct module *__module_text_address(unsigned long addr)
4243{
4244 struct module *mod = __module_address(addr);
4245 if (mod) {
4246 /* Make sure it's within the text section. */
7523e4dc
RR
4247 if (!within(addr, mod->init_layout.base, mod->init_layout.text_size)
4248 && !within(addr, mod->core_layout.base, mod->core_layout.text_size))
e610499e
RR
4249 mod = NULL;
4250 }
4251 return mod;
4252}
c6b37801 4253EXPORT_SYMBOL_GPL(__module_text_address);
e610499e 4254
1da177e4
LT
4255/* Don't grab lock, we're oopsing. */
4256void print_modules(void)
4257{
4258 struct module *mod;
2bc2d61a 4259 char buf[8];
1da177e4 4260
b231125a 4261 printk(KERN_DEFAULT "Modules linked in:");
d72b3751
AK
4262 /* Most callers should already have preempt disabled, but make sure */
4263 preempt_disable();
0d21b0e3
RR
4264 list_for_each_entry_rcu(mod, &modules, list) {
4265 if (mod->state == MODULE_STATE_UNFORMED)
4266 continue;
27bba4d6 4267 pr_cont(" %s%s", mod->name, module_flags(mod, buf));
0d21b0e3 4268 }
d72b3751 4269 preempt_enable();
e14af7ee 4270 if (last_unloaded_module[0])
27bba4d6
JS
4271 pr_cont(" [last unloaded: %s]", last_unloaded_module);
4272 pr_cont("\n");
1da177e4
LT
4273}
4274
1da177e4 4275#ifdef CONFIG_MODVERSIONS
8c8ef42a
RR
4276/* Generate the signature for all relevant module structures here.
4277 * If these change, we don't want to try to parse the module. */
4278void module_layout(struct module *mod,
4279 struct modversion_info *ver,
4280 struct kernel_param *kp,
4281 struct kernel_symbol *ks,
65498646 4282 struct tracepoint * const *tp)
8c8ef42a
RR
4283{
4284}
4285EXPORT_SYMBOL(module_layout);
1da177e4 4286#endif