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1/*
2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
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*/
19#include <linux/module.h>
20#include <linux/moduleloader.h>
21#include <linux/ftrace_event.h>
22#include <linux/init.h>
23#include <linux/kallsyms.h>
24#include <linux/fs.h>
25#include <linux/sysfs.h>
26#include <linux/kernel.h>
27#include <linux/slab.h>
28#include <linux/vmalloc.h>
29#include <linux/elf.h>
30#include <linux/proc_fs.h>
31#include <linux/seq_file.h>
32#include <linux/syscalls.h>
33#include <linux/fcntl.h>
34#include <linux/rcupdate.h>
35#include <linux/capability.h>
36#include <linux/cpu.h>
37#include <linux/moduleparam.h>
38#include <linux/errno.h>
39#include <linux/err.h>
40#include <linux/vermagic.h>
41#include <linux/notifier.h>
42#include <linux/sched.h>
43#include <linux/stop_machine.h>
44#include <linux/device.h>
45#include <linux/string.h>
46#include <linux/mutex.h>
47#include <linux/rculist.h>
48#include <asm/uaccess.h>
49#include <asm/cacheflush.h>
50#include <asm/mmu_context.h>
51#include <linux/license.h>
52#include <asm/sections.h>
53#include <linux/tracepoint.h>
54#include <linux/ftrace.h>
55#include <linux/async.h>
56#include <linux/percpu.h>
57#include <linux/kmemleak.h>
58
59#define CREATE_TRACE_POINTS
60#include <trace/events/module.h>
61
62EXPORT_TRACEPOINT_SYMBOL(module_get);
63
64#if 0
65#define DEBUGP printk
66#else
67#define DEBUGP(fmt , a...)
68#endif
69
70#ifndef ARCH_SHF_SMALL
71#define ARCH_SHF_SMALL 0
72#endif
73
74/* If this is set, the section belongs in the init part of the module */
75#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
76
77/* List of modules, protected by module_mutex or preempt_disable
78 * (delete uses stop_machine/add uses RCU list operations). */
79DEFINE_MUTEX(module_mutex);
80EXPORT_SYMBOL_GPL(module_mutex);
81static LIST_HEAD(modules);
82
83/* Block module loading/unloading? */
84int modules_disabled = 0;
85
86/* Waiting for a module to finish initializing? */
87static DECLARE_WAIT_QUEUE_HEAD(module_wq);
88
89static BLOCKING_NOTIFIER_HEAD(module_notify_list);
90
91/* Bounds of module allocation, for speeding __module_address */
92static unsigned long module_addr_min = -1UL, module_addr_max = 0;
93
94int register_module_notifier(struct notifier_block * nb)
95{
96 return blocking_notifier_chain_register(&module_notify_list, nb);
97}
98EXPORT_SYMBOL(register_module_notifier);
99
100int unregister_module_notifier(struct notifier_block * nb)
101{
102 return blocking_notifier_chain_unregister(&module_notify_list, nb);
103}
104EXPORT_SYMBOL(unregister_module_notifier);
105
106/* We require a truly strong try_module_get(): 0 means failure due to
107 ongoing or failed initialization etc. */
108static inline int strong_try_module_get(struct module *mod)
109{
110 if (mod && mod->state == MODULE_STATE_COMING)
111 return -EBUSY;
112 if (try_module_get(mod))
113 return 0;
114 else
115 return -ENOENT;
116}
117
118static inline void add_taint_module(struct module *mod, unsigned flag)
119{
120 add_taint(flag);
121 mod->taints |= (1U << flag);
122}
123
124/*
125 * A thread that wants to hold a reference to a module only while it
126 * is running can call this to safely exit. nfsd and lockd use this.
127 */
128void __module_put_and_exit(struct module *mod, long code)
129{
130 module_put(mod);
131 do_exit(code);
132}
133EXPORT_SYMBOL(__module_put_and_exit);
134
135/* Find a module section: 0 means not found. */
136static unsigned int find_sec(Elf_Ehdr *hdr,
137 Elf_Shdr *sechdrs,
138 const char *secstrings,
139 const char *name)
140{
141 unsigned int i;
142
143 for (i = 1; i < hdr->e_shnum; i++)
144 /* Alloc bit cleared means "ignore it." */
145 if ((sechdrs[i].sh_flags & SHF_ALLOC)
146 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
147 return i;
148 return 0;
149}
150
151/* Find a module section, or NULL. */
152static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
153 const char *secstrings, const char *name)
154{
155 /* Section 0 has sh_addr 0. */
156 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
157}
158
159/* Find a module section, or NULL. Fill in number of "objects" in section. */
160static void *section_objs(Elf_Ehdr *hdr,
161 Elf_Shdr *sechdrs,
162 const char *secstrings,
163 const char *name,
164 size_t object_size,
165 unsigned int *num)
166{
167 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
168
169 /* Section 0 has sh_addr 0 and sh_size 0. */
170 *num = sechdrs[sec].sh_size / object_size;
171 return (void *)sechdrs[sec].sh_addr;
172}
173
174/* Provided by the linker */
175extern const struct kernel_symbol __start___ksymtab[];
176extern const struct kernel_symbol __stop___ksymtab[];
177extern const struct kernel_symbol __start___ksymtab_gpl[];
178extern const struct kernel_symbol __stop___ksymtab_gpl[];
179extern const struct kernel_symbol __start___ksymtab_gpl_future[];
180extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
181extern const struct kernel_symbol __start___ksymtab_gpl_future[];
182extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
183extern const unsigned long __start___kcrctab[];
184extern const unsigned long __start___kcrctab_gpl[];
185extern const unsigned long __start___kcrctab_gpl_future[];
186#ifdef CONFIG_UNUSED_SYMBOLS
187extern const struct kernel_symbol __start___ksymtab_unused[];
188extern const struct kernel_symbol __stop___ksymtab_unused[];
189extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
190extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
191extern const unsigned long __start___kcrctab_unused[];
192extern const unsigned long __start___kcrctab_unused_gpl[];
193#endif
194
195#ifndef CONFIG_MODVERSIONS
196#define symversion(base, idx) NULL
197#else
198#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
199#endif
200
201static bool each_symbol_in_section(const struct symsearch *arr,
202 unsigned int arrsize,
203 struct module *owner,
204 bool (*fn)(const struct symsearch *syms,
205 struct module *owner,
206 unsigned int symnum, void *data),
207 void *data)
208{
209 unsigned int i, j;
210
211 for (j = 0; j < arrsize; j++) {
212 for (i = 0; i < arr[j].stop - arr[j].start; i++)
213 if (fn(&arr[j], owner, i, data))
214 return true;
215 }
216
217 return false;
218}
219
220/* Returns true as soon as fn returns true, otherwise false. */
221bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
222 unsigned int symnum, void *data), void *data)
223{
224 struct module *mod;
225 const struct symsearch arr[] = {
226 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
227 NOT_GPL_ONLY, false },
228 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
229 __start___kcrctab_gpl,
230 GPL_ONLY, false },
231 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
232 __start___kcrctab_gpl_future,
233 WILL_BE_GPL_ONLY, false },
234#ifdef CONFIG_UNUSED_SYMBOLS
235 { __start___ksymtab_unused, __stop___ksymtab_unused,
236 __start___kcrctab_unused,
237 NOT_GPL_ONLY, true },
238 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
239 __start___kcrctab_unused_gpl,
240 GPL_ONLY, true },
241#endif
242 };
243
244 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
245 return true;
246
247 list_for_each_entry_rcu(mod, &modules, list) {
248 struct symsearch arr[] = {
249 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
250 NOT_GPL_ONLY, false },
251 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
252 mod->gpl_crcs,
253 GPL_ONLY, false },
254 { mod->gpl_future_syms,
255 mod->gpl_future_syms + mod->num_gpl_future_syms,
256 mod->gpl_future_crcs,
257 WILL_BE_GPL_ONLY, false },
258#ifdef CONFIG_UNUSED_SYMBOLS
259 { mod->unused_syms,
260 mod->unused_syms + mod->num_unused_syms,
261 mod->unused_crcs,
262 NOT_GPL_ONLY, true },
263 { mod->unused_gpl_syms,
264 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
265 mod->unused_gpl_crcs,
266 GPL_ONLY, true },
267#endif
268 };
269
270 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
271 return true;
272 }
273 return false;
274}
275EXPORT_SYMBOL_GPL(each_symbol);
276
277struct find_symbol_arg {
278 /* Input */
279 const char *name;
280 bool gplok;
281 bool warn;
282
283 /* Output */
284 struct module *owner;
285 const unsigned long *crc;
286 const struct kernel_symbol *sym;
287};
288
289static bool find_symbol_in_section(const struct symsearch *syms,
290 struct module *owner,
291 unsigned int symnum, void *data)
292{
293 struct find_symbol_arg *fsa = data;
294
295 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
296 return false;
297
298 if (!fsa->gplok) {
299 if (syms->licence == GPL_ONLY)
300 return false;
301 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
302 printk(KERN_WARNING "Symbol %s is being used "
303 "by a non-GPL module, which will not "
304 "be allowed in the future\n", fsa->name);
305 printk(KERN_WARNING "Please see the file "
306 "Documentation/feature-removal-schedule.txt "
307 "in the kernel source tree for more details.\n");
308 }
309 }
310
311#ifdef CONFIG_UNUSED_SYMBOLS
312 if (syms->unused && fsa->warn) {
313 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
314 "however this module is using it.\n", fsa->name);
315 printk(KERN_WARNING
316 "This symbol will go away in the future.\n");
317 printk(KERN_WARNING
318 "Please evalute if this is the right api to use and if "
319 "it really is, submit a report the linux kernel "
320 "mailinglist together with submitting your code for "
321 "inclusion.\n");
322 }
323#endif
324
325 fsa->owner = owner;
326 fsa->crc = symversion(syms->crcs, symnum);
327 fsa->sym = &syms->start[symnum];
328 return true;
329}
330
331/* Find a symbol and return it, along with, (optional) crc and
332 * (optional) module which owns it */
333const struct kernel_symbol *find_symbol(const char *name,
334 struct module **owner,
335 const unsigned long **crc,
336 bool gplok,
337 bool warn)
338{
339 struct find_symbol_arg fsa;
340
341 fsa.name = name;
342 fsa.gplok = gplok;
343 fsa.warn = warn;
344
345 if (each_symbol(find_symbol_in_section, &fsa)) {
346 if (owner)
347 *owner = fsa.owner;
348 if (crc)
349 *crc = fsa.crc;
350 return fsa.sym;
351 }
352
353 DEBUGP("Failed to find symbol %s\n", name);
354 return NULL;
355}
356EXPORT_SYMBOL_GPL(find_symbol);
357
358/* Search for module by name: must hold module_mutex. */
359struct module *find_module(const char *name)
360{
361 struct module *mod;
362
363 list_for_each_entry(mod, &modules, list) {
364 if (strcmp(mod->name, name) == 0)
365 return mod;
366 }
367 return NULL;
368}
369EXPORT_SYMBOL_GPL(find_module);
370
371#ifdef CONFIG_SMP
372
373static void *percpu_modalloc(unsigned long size, unsigned long align,
374 const char *name)
375{
376 void *ptr;
377
378 if (align > PAGE_SIZE) {
379 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
380 name, align, PAGE_SIZE);
381 align = PAGE_SIZE;
382 }
383
384 ptr = __alloc_reserved_percpu(size, align);
385 if (!ptr)
386 printk(KERN_WARNING
387 "Could not allocate %lu bytes percpu data\n", size);
388 return ptr;
389}
390
391static void percpu_modfree(void *freeme)
392{
393 free_percpu(freeme);
394}
395
396static unsigned int find_pcpusec(Elf_Ehdr *hdr,
397 Elf_Shdr *sechdrs,
398 const char *secstrings)
399{
400 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
401}
402
403static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
404{
405 int cpu;
406
407 for_each_possible_cpu(cpu)
408 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
409}
410
411#else /* ... !CONFIG_SMP */
412
413static inline void *percpu_modalloc(unsigned long size, unsigned long align,
414 const char *name)
415{
416 return NULL;
417}
418static inline void percpu_modfree(void *pcpuptr)
419{
420 BUG();
421}
422static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
423 Elf_Shdr *sechdrs,
424 const char *secstrings)
425{
426 return 0;
427}
428static inline void percpu_modcopy(void *pcpudst, const void *src,
429 unsigned long size)
430{
431 /* pcpusec should be 0, and size of that section should be 0. */
432 BUG_ON(size != 0);
433}
434
435#endif /* CONFIG_SMP */
436
437#define MODINFO_ATTR(field) \
438static void setup_modinfo_##field(struct module *mod, const char *s) \
439{ \
440 mod->field = kstrdup(s, GFP_KERNEL); \
441} \
442static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
443 struct module *mod, char *buffer) \
444{ \
445 return sprintf(buffer, "%s\n", mod->field); \
446} \
447static int modinfo_##field##_exists(struct module *mod) \
448{ \
449 return mod->field != NULL; \
450} \
451static void free_modinfo_##field(struct module *mod) \
452{ \
453 kfree(mod->field); \
454 mod->field = NULL; \
455} \
456static struct module_attribute modinfo_##field = { \
457 .attr = { .name = __stringify(field), .mode = 0444 }, \
458 .show = show_modinfo_##field, \
459 .setup = setup_modinfo_##field, \
460 .test = modinfo_##field##_exists, \
461 .free = free_modinfo_##field, \
462};
463
464MODINFO_ATTR(version);
465MODINFO_ATTR(srcversion);
466
467static char last_unloaded_module[MODULE_NAME_LEN+1];
468
469#ifdef CONFIG_MODULE_UNLOAD
470/* Init the unload section of the module. */
471static void module_unload_init(struct module *mod)
472{
473 int cpu;
474
475 INIT_LIST_HEAD(&mod->modules_which_use_me);
476 for_each_possible_cpu(cpu)
477 local_set(__module_ref_addr(mod, cpu), 0);
478 /* Hold reference count during initialization. */
479 local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1);
480 /* Backwards compatibility macros put refcount during init. */
481 mod->waiter = current;
482}
483
484/* modules using other modules */
485struct module_use
486{
487 struct list_head list;
488 struct module *module_which_uses;
489};
490
491/* Does a already use b? */
492static int already_uses(struct module *a, struct module *b)
493{
494 struct module_use *use;
495
496 list_for_each_entry(use, &b->modules_which_use_me, list) {
497 if (use->module_which_uses == a) {
498 DEBUGP("%s uses %s!\n", a->name, b->name);
499 return 1;
500 }
501 }
502 DEBUGP("%s does not use %s!\n", a->name, b->name);
503 return 0;
504}
505
506/* Module a uses b */
507int use_module(struct module *a, struct module *b)
508{
509 struct module_use *use;
510 int no_warn, err;
511
512 if (b == NULL || already_uses(a, b)) return 1;
513
514 /* If we're interrupted or time out, we fail. */
515 if (wait_event_interruptible_timeout(
516 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
517 30 * HZ) <= 0) {
518 printk("%s: gave up waiting for init of module %s.\n",
519 a->name, b->name);
520 return 0;
521 }
522
523 /* If strong_try_module_get() returned a different error, we fail. */
524 if (err)
525 return 0;
526
527 DEBUGP("Allocating new usage for %s.\n", a->name);
528 use = kmalloc(sizeof(*use), GFP_ATOMIC);
529 if (!use) {
530 printk("%s: out of memory loading\n", a->name);
531 module_put(b);
532 return 0;
533 }
534
535 use->module_which_uses = a;
536 list_add(&use->list, &b->modules_which_use_me);
537 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
538 return 1;
539}
540EXPORT_SYMBOL_GPL(use_module);
541
542/* Clear the unload stuff of the module. */
543static void module_unload_free(struct module *mod)
544{
545 struct module *i;
546
547 list_for_each_entry(i, &modules, list) {
548 struct module_use *use;
549
550 list_for_each_entry(use, &i->modules_which_use_me, list) {
551 if (use->module_which_uses == mod) {
552 DEBUGP("%s unusing %s\n", mod->name, i->name);
553 module_put(i);
554 list_del(&use->list);
555 kfree(use);
556 sysfs_remove_link(i->holders_dir, mod->name);
557 /* There can be at most one match. */
558 break;
559 }
560 }
561 }
562}
563
564#ifdef CONFIG_MODULE_FORCE_UNLOAD
565static inline int try_force_unload(unsigned int flags)
566{
567 int ret = (flags & O_TRUNC);
568 if (ret)
569 add_taint(TAINT_FORCED_RMMOD);
570 return ret;
571}
572#else
573static inline int try_force_unload(unsigned int flags)
574{
575 return 0;
576}
577#endif /* CONFIG_MODULE_FORCE_UNLOAD */
578
579struct stopref
580{
581 struct module *mod;
582 int flags;
583 int *forced;
584};
585
586/* Whole machine is stopped with interrupts off when this runs. */
587static int __try_stop_module(void *_sref)
588{
589 struct stopref *sref = _sref;
590
591 /* If it's not unused, quit unless we're forcing. */
592 if (module_refcount(sref->mod) != 0) {
593 if (!(*sref->forced = try_force_unload(sref->flags)))
594 return -EWOULDBLOCK;
595 }
596
597 /* Mark it as dying. */
598 sref->mod->state = MODULE_STATE_GOING;
599 return 0;
600}
601
602static int try_stop_module(struct module *mod, int flags, int *forced)
603{
604 if (flags & O_NONBLOCK) {
605 struct stopref sref = { mod, flags, forced };
606
607 return stop_machine(__try_stop_module, &sref, NULL);
608 } else {
609 /* We don't need to stop the machine for this. */
610 mod->state = MODULE_STATE_GOING;
611 synchronize_sched();
612 return 0;
613 }
614}
615
616unsigned int module_refcount(struct module *mod)
617{
618 unsigned int total = 0;
619 int cpu;
620
621 for_each_possible_cpu(cpu)
622 total += local_read(__module_ref_addr(mod, cpu));
623 return total;
624}
625EXPORT_SYMBOL(module_refcount);
626
627/* This exists whether we can unload or not */
628static void free_module(struct module *mod);
629
630static void wait_for_zero_refcount(struct module *mod)
631{
632 /* Since we might sleep for some time, release the mutex first */
633 mutex_unlock(&module_mutex);
634 for (;;) {
635 DEBUGP("Looking at refcount...\n");
636 set_current_state(TASK_UNINTERRUPTIBLE);
637 if (module_refcount(mod) == 0)
638 break;
639 schedule();
640 }
641 current->state = TASK_RUNNING;
642 mutex_lock(&module_mutex);
643}
644
645SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
646 unsigned int, flags)
647{
648 struct module *mod;
649 char name[MODULE_NAME_LEN];
650 int ret, forced = 0;
651
652 if (!capable(CAP_SYS_MODULE) || modules_disabled)
653 return -EPERM;
654
655 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
656 return -EFAULT;
657 name[MODULE_NAME_LEN-1] = '\0';
658
659 /* Create stop_machine threads since free_module relies on
660 * a non-failing stop_machine call. */
661 ret = stop_machine_create();
662 if (ret)
663 return ret;
664
665 if (mutex_lock_interruptible(&module_mutex) != 0) {
666 ret = -EINTR;
667 goto out_stop;
668 }
669
670 mod = find_module(name);
671 if (!mod) {
672 ret = -ENOENT;
673 goto out;
674 }
675
676 if (!list_empty(&mod->modules_which_use_me)) {
677 /* Other modules depend on us: get rid of them first. */
678 ret = -EWOULDBLOCK;
679 goto out;
680 }
681
682 /* Doing init or already dying? */
683 if (mod->state != MODULE_STATE_LIVE) {
684 /* FIXME: if (force), slam module count and wake up
685 waiter --RR */
686 DEBUGP("%s already dying\n", mod->name);
687 ret = -EBUSY;
688 goto out;
689 }
690
691 /* If it has an init func, it must have an exit func to unload */
692 if (mod->init && !mod->exit) {
693 forced = try_force_unload(flags);
694 if (!forced) {
695 /* This module can't be removed */
696 ret = -EBUSY;
697 goto out;
698 }
699 }
700
701 /* Set this up before setting mod->state */
702 mod->waiter = current;
703
704 /* Stop the machine so refcounts can't move and disable module. */
705 ret = try_stop_module(mod, flags, &forced);
706 if (ret != 0)
707 goto out;
708
709 /* Never wait if forced. */
710 if (!forced && module_refcount(mod) != 0)
711 wait_for_zero_refcount(mod);
712
713 mutex_unlock(&module_mutex);
714 /* Final destruction now noone is using it. */
715 if (mod->exit != NULL)
716 mod->exit();
717 blocking_notifier_call_chain(&module_notify_list,
718 MODULE_STATE_GOING, mod);
719 async_synchronize_full();
720 mutex_lock(&module_mutex);
721 /* Store the name of the last unloaded module for diagnostic purposes */
722 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
723 ddebug_remove_module(mod->name);
724 free_module(mod);
725
726 out:
727 mutex_unlock(&module_mutex);
728out_stop:
729 stop_machine_destroy();
730 return ret;
731}
732
733static inline void print_unload_info(struct seq_file *m, struct module *mod)
734{
735 struct module_use *use;
736 int printed_something = 0;
737
738 seq_printf(m, " %u ", module_refcount(mod));
739
740 /* Always include a trailing , so userspace can differentiate
741 between this and the old multi-field proc format. */
742 list_for_each_entry(use, &mod->modules_which_use_me, list) {
743 printed_something = 1;
744 seq_printf(m, "%s,", use->module_which_uses->name);
745 }
746
747 if (mod->init != NULL && mod->exit == NULL) {
748 printed_something = 1;
749 seq_printf(m, "[permanent],");
750 }
751
752 if (!printed_something)
753 seq_printf(m, "-");
754}
755
756void __symbol_put(const char *symbol)
757{
758 struct module *owner;
759
760 preempt_disable();
761 if (!find_symbol(symbol, &owner, NULL, true, false))
762 BUG();
763 module_put(owner);
764 preempt_enable();
765}
766EXPORT_SYMBOL(__symbol_put);
767
768/* Note this assumes addr is a function, which it currently always is. */
769void symbol_put_addr(void *addr)
770{
771 struct module *modaddr;
772 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
773
774 if (core_kernel_text(a))
775 return;
776
777 /* module_text_address is safe here: we're supposed to have reference
778 * to module from symbol_get, so it can't go away. */
779 modaddr = __module_text_address(a);
780 BUG_ON(!modaddr);
781 module_put(modaddr);
782}
783EXPORT_SYMBOL_GPL(symbol_put_addr);
784
785static ssize_t show_refcnt(struct module_attribute *mattr,
786 struct module *mod, char *buffer)
787{
788 return sprintf(buffer, "%u\n", module_refcount(mod));
789}
790
791static struct module_attribute refcnt = {
792 .attr = { .name = "refcnt", .mode = 0444 },
793 .show = show_refcnt,
794};
795
796void module_put(struct module *module)
797{
798 if (module) {
799 unsigned int cpu = get_cpu();
800 local_dec(__module_ref_addr(module, cpu));
801 trace_module_put(module, _RET_IP_,
802 local_read(__module_ref_addr(module, cpu)));
803 /* Maybe they're waiting for us to drop reference? */
804 if (unlikely(!module_is_live(module)))
805 wake_up_process(module->waiter);
806 put_cpu();
807 }
808}
809EXPORT_SYMBOL(module_put);
810
811#else /* !CONFIG_MODULE_UNLOAD */
812static inline void print_unload_info(struct seq_file *m, struct module *mod)
813{
814 /* We don't know the usage count, or what modules are using. */
815 seq_printf(m, " - -");
816}
817
818static inline void module_unload_free(struct module *mod)
819{
820}
821
822int use_module(struct module *a, struct module *b)
823{
824 return strong_try_module_get(b) == 0;
825}
826EXPORT_SYMBOL_GPL(use_module);
827
828static inline void module_unload_init(struct module *mod)
829{
830}
831#endif /* CONFIG_MODULE_UNLOAD */
832
833static ssize_t show_initstate(struct module_attribute *mattr,
834 struct module *mod, char *buffer)
835{
836 const char *state = "unknown";
837
838 switch (mod->state) {
839 case MODULE_STATE_LIVE:
840 state = "live";
841 break;
842 case MODULE_STATE_COMING:
843 state = "coming";
844 break;
845 case MODULE_STATE_GOING:
846 state = "going";
847 break;
848 }
849 return sprintf(buffer, "%s\n", state);
850}
851
852static struct module_attribute initstate = {
853 .attr = { .name = "initstate", .mode = 0444 },
854 .show = show_initstate,
855};
856
857static struct module_attribute *modinfo_attrs[] = {
858 &modinfo_version,
859 &modinfo_srcversion,
860 &initstate,
861#ifdef CONFIG_MODULE_UNLOAD
862 &refcnt,
863#endif
864 NULL,
865};
866
867static const char vermagic[] = VERMAGIC_STRING;
868
869static int try_to_force_load(struct module *mod, const char *reason)
870{
871#ifdef CONFIG_MODULE_FORCE_LOAD
872 if (!test_taint(TAINT_FORCED_MODULE))
873 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
874 mod->name, reason);
875 add_taint_module(mod, TAINT_FORCED_MODULE);
876 return 0;
877#else
878 return -ENOEXEC;
879#endif
880}
881
882#ifdef CONFIG_MODVERSIONS
883/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
884static unsigned long maybe_relocated(unsigned long crc,
885 const struct module *crc_owner)
886{
887#ifdef ARCH_RELOCATES_KCRCTAB
888 if (crc_owner == NULL)
889 return crc - (unsigned long)reloc_start;
890#endif
891 return crc;
892}
893
894static int check_version(Elf_Shdr *sechdrs,
895 unsigned int versindex,
896 const char *symname,
897 struct module *mod,
898 const unsigned long *crc,
899 const struct module *crc_owner)
900{
901 unsigned int i, num_versions;
902 struct modversion_info *versions;
903
904 /* Exporting module didn't supply crcs? OK, we're already tainted. */
905 if (!crc)
906 return 1;
907
908 /* No versions at all? modprobe --force does this. */
909 if (versindex == 0)
910 return try_to_force_load(mod, symname) == 0;
911
912 versions = (void *) sechdrs[versindex].sh_addr;
913 num_versions = sechdrs[versindex].sh_size
914 / sizeof(struct modversion_info);
915
916 for (i = 0; i < num_versions; i++) {
917 if (strcmp(versions[i].name, symname) != 0)
918 continue;
919
920 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
921 return 1;
922 DEBUGP("Found checksum %lX vs module %lX\n",
923 maybe_relocated(*crc, crc_owner), versions[i].crc);
924 goto bad_version;
925 }
926
927 printk(KERN_WARNING "%s: no symbol version for %s\n",
928 mod->name, symname);
929 return 0;
930
931bad_version:
932 printk("%s: disagrees about version of symbol %s\n",
933 mod->name, symname);
934 return 0;
935}
936
937static inline int check_modstruct_version(Elf_Shdr *sechdrs,
938 unsigned int versindex,
939 struct module *mod)
940{
941 const unsigned long *crc;
942
943 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
944 &crc, true, false))
945 BUG();
946 return check_version(sechdrs, versindex, "module_layout", mod, crc,
947 NULL);
948}
949
950/* First part is kernel version, which we ignore if module has crcs. */
951static inline int same_magic(const char *amagic, const char *bmagic,
952 bool has_crcs)
953{
954 if (has_crcs) {
955 amagic += strcspn(amagic, " ");
956 bmagic += strcspn(bmagic, " ");
957 }
958 return strcmp(amagic, bmagic) == 0;
959}
960#else
961static inline int check_version(Elf_Shdr *sechdrs,
962 unsigned int versindex,
963 const char *symname,
964 struct module *mod,
965 const unsigned long *crc,
966 const struct module *crc_owner)
967{
968 return 1;
969}
970
971static inline int check_modstruct_version(Elf_Shdr *sechdrs,
972 unsigned int versindex,
973 struct module *mod)
974{
975 return 1;
976}
977
978static inline int same_magic(const char *amagic, const char *bmagic,
979 bool has_crcs)
980{
981 return strcmp(amagic, bmagic) == 0;
982}
983#endif /* CONFIG_MODVERSIONS */
984
985/* Resolve a symbol for this module. I.e. if we find one, record usage.
986 Must be holding module_mutex. */
987static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
988 unsigned int versindex,
989 const char *name,
990 struct module *mod)
991{
992 struct module *owner;
993 const struct kernel_symbol *sym;
994 const unsigned long *crc;
995
996 sym = find_symbol(name, &owner, &crc,
997 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
998 /* use_module can fail due to OOM,
999 or module initialization or unloading */
1000 if (sym) {
1001 if (!check_version(sechdrs, versindex, name, mod, crc, owner)
1002 || !use_module(mod, owner))
1003 sym = NULL;
1004 }
1005 return sym;
1006}
1007
1008/*
1009 * /sys/module/foo/sections stuff
1010 * J. Corbet <corbet@lwn.net>
1011 */
1012#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1013
1014static inline bool sect_empty(const Elf_Shdr *sect)
1015{
1016 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1017}
1018
1019struct module_sect_attr
1020{
1021 struct module_attribute mattr;
1022 char *name;
1023 unsigned long address;
1024};
1025
1026struct module_sect_attrs
1027{
1028 struct attribute_group grp;
1029 unsigned int nsections;
1030 struct module_sect_attr attrs[0];
1031};
1032
1033static ssize_t module_sect_show(struct module_attribute *mattr,
1034 struct module *mod, char *buf)
1035{
1036 struct module_sect_attr *sattr =
1037 container_of(mattr, struct module_sect_attr, mattr);
1038 return sprintf(buf, "0x%lx\n", sattr->address);
1039}
1040
1041static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1042{
1043 unsigned int section;
1044
1045 for (section = 0; section < sect_attrs->nsections; section++)
1046 kfree(sect_attrs->attrs[section].name);
1047 kfree(sect_attrs);
1048}
1049
1050static void add_sect_attrs(struct module *mod, unsigned int nsect,
1051 char *secstrings, Elf_Shdr *sechdrs)
1052{
1053 unsigned int nloaded = 0, i, size[2];
1054 struct module_sect_attrs *sect_attrs;
1055 struct module_sect_attr *sattr;
1056 struct attribute **gattr;
1057
1058 /* Count loaded sections and allocate structures */
1059 for (i = 0; i < nsect; i++)
1060 if (!sect_empty(&sechdrs[i]))
1061 nloaded++;
1062 size[0] = ALIGN(sizeof(*sect_attrs)
1063 + nloaded * sizeof(sect_attrs->attrs[0]),
1064 sizeof(sect_attrs->grp.attrs[0]));
1065 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1066 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1067 if (sect_attrs == NULL)
1068 return;
1069
1070 /* Setup section attributes. */
1071 sect_attrs->grp.name = "sections";
1072 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1073
1074 sect_attrs->nsections = 0;
1075 sattr = &sect_attrs->attrs[0];
1076 gattr = &sect_attrs->grp.attrs[0];
1077 for (i = 0; i < nsect; i++) {
1078 if (sect_empty(&sechdrs[i]))
1079 continue;
1080 sattr->address = sechdrs[i].sh_addr;
1081 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1082 GFP_KERNEL);
1083 if (sattr->name == NULL)
1084 goto out;
1085 sect_attrs->nsections++;
1086 sattr->mattr.show = module_sect_show;
1087 sattr->mattr.store = NULL;
1088 sattr->mattr.attr.name = sattr->name;
1089 sattr->mattr.attr.mode = S_IRUGO;
1090 *(gattr++) = &(sattr++)->mattr.attr;
1091 }
1092 *gattr = NULL;
1093
1094 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1095 goto out;
1096
1097 mod->sect_attrs = sect_attrs;
1098 return;
1099 out:
1100 free_sect_attrs(sect_attrs);
1101}
1102
1103static void remove_sect_attrs(struct module *mod)
1104{
1105 if (mod->sect_attrs) {
1106 sysfs_remove_group(&mod->mkobj.kobj,
1107 &mod->sect_attrs->grp);
1108 /* We are positive that no one is using any sect attrs
1109 * at this point. Deallocate immediately. */
1110 free_sect_attrs(mod->sect_attrs);
1111 mod->sect_attrs = NULL;
1112 }
1113}
1114
1115/*
1116 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1117 */
1118
1119struct module_notes_attrs {
1120 struct kobject *dir;
1121 unsigned int notes;
1122 struct bin_attribute attrs[0];
1123};
1124
1125static ssize_t module_notes_read(struct kobject *kobj,
1126 struct bin_attribute *bin_attr,
1127 char *buf, loff_t pos, size_t count)
1128{
1129 /*
1130 * The caller checked the pos and count against our size.
1131 */
1132 memcpy(buf, bin_attr->private + pos, count);
1133 return count;
1134}
1135
1136static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1137 unsigned int i)
1138{
1139 if (notes_attrs->dir) {
1140 while (i-- > 0)
1141 sysfs_remove_bin_file(notes_attrs->dir,
1142 &notes_attrs->attrs[i]);
1143 kobject_put(notes_attrs->dir);
1144 }
1145 kfree(notes_attrs);
1146}
1147
1148static void add_notes_attrs(struct module *mod, unsigned int nsect,
1149 char *secstrings, Elf_Shdr *sechdrs)
1150{
1151 unsigned int notes, loaded, i;
1152 struct module_notes_attrs *notes_attrs;
1153 struct bin_attribute *nattr;
1154
1155 /* failed to create section attributes, so can't create notes */
1156 if (!mod->sect_attrs)
1157 return;
1158
1159 /* Count notes sections and allocate structures. */
1160 notes = 0;
1161 for (i = 0; i < nsect; i++)
1162 if (!sect_empty(&sechdrs[i]) &&
1163 (sechdrs[i].sh_type == SHT_NOTE))
1164 ++notes;
1165
1166 if (notes == 0)
1167 return;
1168
1169 notes_attrs = kzalloc(sizeof(*notes_attrs)
1170 + notes * sizeof(notes_attrs->attrs[0]),
1171 GFP_KERNEL);
1172 if (notes_attrs == NULL)
1173 return;
1174
1175 notes_attrs->notes = notes;
1176 nattr = &notes_attrs->attrs[0];
1177 for (loaded = i = 0; i < nsect; ++i) {
1178 if (sect_empty(&sechdrs[i]))
1179 continue;
1180 if (sechdrs[i].sh_type == SHT_NOTE) {
1181 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1182 nattr->attr.mode = S_IRUGO;
1183 nattr->size = sechdrs[i].sh_size;
1184 nattr->private = (void *) sechdrs[i].sh_addr;
1185 nattr->read = module_notes_read;
1186 ++nattr;
1187 }
1188 ++loaded;
1189 }
1190
1191 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1192 if (!notes_attrs->dir)
1193 goto out;
1194
1195 for (i = 0; i < notes; ++i)
1196 if (sysfs_create_bin_file(notes_attrs->dir,
1197 &notes_attrs->attrs[i]))
1198 goto out;
1199
1200 mod->notes_attrs = notes_attrs;
1201 return;
1202
1203 out:
1204 free_notes_attrs(notes_attrs, i);
1205}
1206
1207static void remove_notes_attrs(struct module *mod)
1208{
1209 if (mod->notes_attrs)
1210 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1211}
1212
1213#else
1214
1215static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1216 char *sectstrings, Elf_Shdr *sechdrs)
1217{
1218}
1219
1220static inline void remove_sect_attrs(struct module *mod)
1221{
1222}
1223
1224static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1225 char *sectstrings, Elf_Shdr *sechdrs)
1226{
1227}
1228
1229static inline void remove_notes_attrs(struct module *mod)
1230{
1231}
1232#endif
1233
1234#ifdef CONFIG_SYSFS
1235int module_add_modinfo_attrs(struct module *mod)
1236{
1237 struct module_attribute *attr;
1238 struct module_attribute *temp_attr;
1239 int error = 0;
1240 int i;
1241
1242 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1243 (ARRAY_SIZE(modinfo_attrs) + 1)),
1244 GFP_KERNEL);
1245 if (!mod->modinfo_attrs)
1246 return -ENOMEM;
1247
1248 temp_attr = mod->modinfo_attrs;
1249 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1250 if (!attr->test ||
1251 (attr->test && attr->test(mod))) {
1252 memcpy(temp_attr, attr, sizeof(*temp_attr));
1253 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1254 ++temp_attr;
1255 }
1256 }
1257 return error;
1258}
1259
1260void module_remove_modinfo_attrs(struct module *mod)
1261{
1262 struct module_attribute *attr;
1263 int i;
1264
1265 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1266 /* pick a field to test for end of list */
1267 if (!attr->attr.name)
1268 break;
1269 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1270 if (attr->free)
1271 attr->free(mod);
1272 }
1273 kfree(mod->modinfo_attrs);
1274}
1275
1276int mod_sysfs_init(struct module *mod)
1277{
1278 int err;
1279 struct kobject *kobj;
1280
1281 if (!module_sysfs_initialized) {
1282 printk(KERN_ERR "%s: module sysfs not initialized\n",
1283 mod->name);
1284 err = -EINVAL;
1285 goto out;
1286 }
1287
1288 kobj = kset_find_obj(module_kset, mod->name);
1289 if (kobj) {
1290 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1291 kobject_put(kobj);
1292 err = -EINVAL;
1293 goto out;
1294 }
1295
1296 mod->mkobj.mod = mod;
1297
1298 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1299 mod->mkobj.kobj.kset = module_kset;
1300 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1301 "%s", mod->name);
1302 if (err)
1303 kobject_put(&mod->mkobj.kobj);
1304
1305 /* delay uevent until full sysfs population */
1306out:
1307 return err;
1308}
1309
1310int mod_sysfs_setup(struct module *mod,
1311 struct kernel_param *kparam,
1312 unsigned int num_params)
1313{
1314 int err;
1315
1316 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1317 if (!mod->holders_dir) {
1318 err = -ENOMEM;
1319 goto out_unreg;
1320 }
1321
1322 err = module_param_sysfs_setup(mod, kparam, num_params);
1323 if (err)
1324 goto out_unreg_holders;
1325
1326 err = module_add_modinfo_attrs(mod);
1327 if (err)
1328 goto out_unreg_param;
1329
1330 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1331 return 0;
1332
1333out_unreg_param:
1334 module_param_sysfs_remove(mod);
1335out_unreg_holders:
1336 kobject_put(mod->holders_dir);
1337out_unreg:
1338 kobject_put(&mod->mkobj.kobj);
1339 return err;
1340}
1341
1342static void mod_sysfs_fini(struct module *mod)
1343{
1344 kobject_put(&mod->mkobj.kobj);
1345}
1346
1347#else /* CONFIG_SYSFS */
1348
1349static void mod_sysfs_fini(struct module *mod)
1350{
1351}
1352
1353#endif /* CONFIG_SYSFS */
1354
1355static void mod_kobject_remove(struct module *mod)
1356{
1357 module_remove_modinfo_attrs(mod);
1358 module_param_sysfs_remove(mod);
1359 kobject_put(mod->mkobj.drivers_dir);
1360 kobject_put(mod->holders_dir);
1361 mod_sysfs_fini(mod);
1362}
1363
1364/*
1365 * unlink the module with the whole machine is stopped with interrupts off
1366 * - this defends against kallsyms not taking locks
1367 */
1368static int __unlink_module(void *_mod)
1369{
1370 struct module *mod = _mod;
1371 list_del(&mod->list);
1372 return 0;
1373}
1374
1375/* Free a module, remove from lists, etc (must hold module_mutex). */
1376static void free_module(struct module *mod)
1377{
1378 trace_module_free(mod);
1379
1380 /* Delete from various lists */
1381 stop_machine(__unlink_module, mod, NULL);
1382 remove_notes_attrs(mod);
1383 remove_sect_attrs(mod);
1384 mod_kobject_remove(mod);
1385
1386 /* Arch-specific cleanup. */
1387 module_arch_cleanup(mod);
1388
1389 /* Module unload stuff */
1390 module_unload_free(mod);
1391
1392 /* Free any allocated parameters. */
1393 destroy_params(mod->kp, mod->num_kp);
1394
1395 /* This may be NULL, but that's OK */
1396 module_free(mod, mod->module_init);
1397 kfree(mod->args);
1398 if (mod->percpu)
1399 percpu_modfree(mod->percpu);
1400#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
1401 if (mod->refptr)
1402 percpu_modfree(mod->refptr);
1403#endif
1404 /* Free lock-classes: */
1405 lockdep_free_key_range(mod->module_core, mod->core_size);
1406
1407 /* Finally, free the core (containing the module structure) */
1408 module_free(mod, mod->module_core);
1409
1410#ifdef CONFIG_MPU
1411 update_protections(current->mm);
1412#endif
1413}
1414
1415void *__symbol_get(const char *symbol)
1416{
1417 struct module *owner;
1418 const struct kernel_symbol *sym;
1419
1420 preempt_disable();
1421 sym = find_symbol(symbol, &owner, NULL, true, true);
1422 if (sym && strong_try_module_get(owner))
1423 sym = NULL;
1424 preempt_enable();
1425
1426 return sym ? (void *)sym->value : NULL;
1427}
1428EXPORT_SYMBOL_GPL(__symbol_get);
1429
1430/*
1431 * Ensure that an exported symbol [global namespace] does not already exist
1432 * in the kernel or in some other module's exported symbol table.
1433 */
1434static int verify_export_symbols(struct module *mod)
1435{
1436 unsigned int i;
1437 struct module *owner;
1438 const struct kernel_symbol *s;
1439 struct {
1440 const struct kernel_symbol *sym;
1441 unsigned int num;
1442 } arr[] = {
1443 { mod->syms, mod->num_syms },
1444 { mod->gpl_syms, mod->num_gpl_syms },
1445 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1446#ifdef CONFIG_UNUSED_SYMBOLS
1447 { mod->unused_syms, mod->num_unused_syms },
1448 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1449#endif
1450 };
1451
1452 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1453 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1454 if (find_symbol(s->name, &owner, NULL, true, false)) {
1455 printk(KERN_ERR
1456 "%s: exports duplicate symbol %s"
1457 " (owned by %s)\n",
1458 mod->name, s->name, module_name(owner));
1459 return -ENOEXEC;
1460 }
1461 }
1462 }
1463 return 0;
1464}
1465
1466/* Change all symbols so that st_value encodes the pointer directly. */
1467static int simplify_symbols(Elf_Shdr *sechdrs,
1468 unsigned int symindex,
1469 const char *strtab,
1470 unsigned int versindex,
1471 unsigned int pcpuindex,
1472 struct module *mod)
1473{
1474 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1475 unsigned long secbase;
1476 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1477 int ret = 0;
1478 const struct kernel_symbol *ksym;
1479
1480 for (i = 1; i < n; i++) {
1481 switch (sym[i].st_shndx) {
1482 case SHN_COMMON:
1483 /* We compiled with -fno-common. These are not
1484 supposed to happen. */
1485 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1486 printk("%s: please compile with -fno-common\n",
1487 mod->name);
1488 ret = -ENOEXEC;
1489 break;
1490
1491 case SHN_ABS:
1492 /* Don't need to do anything */
1493 DEBUGP("Absolute symbol: 0x%08lx\n",
1494 (long)sym[i].st_value);
1495 break;
1496
1497 case SHN_UNDEF:
1498 ksym = resolve_symbol(sechdrs, versindex,
1499 strtab + sym[i].st_name, mod);
1500 /* Ok if resolved. */
1501 if (ksym) {
1502 sym[i].st_value = ksym->value;
1503 break;
1504 }
1505
1506 /* Ok if weak. */
1507 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1508 break;
1509
1510 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1511 mod->name, strtab + sym[i].st_name);
1512 ret = -ENOENT;
1513 break;
1514
1515 default:
1516 /* Divert to percpu allocation if a percpu var. */
1517 if (sym[i].st_shndx == pcpuindex)
1518 secbase = (unsigned long)mod->percpu;
1519 else
1520 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1521 sym[i].st_value += secbase;
1522 break;
1523 }
1524 }
1525
1526 return ret;
1527}
1528
1529/* Additional bytes needed by arch in front of individual sections */
1530unsigned int __weak arch_mod_section_prepend(struct module *mod,
1531 unsigned int section)
1532{
1533 /* default implementation just returns zero */
1534 return 0;
1535}
1536
1537/* Update size with this section: return offset. */
1538static long get_offset(struct module *mod, unsigned int *size,
1539 Elf_Shdr *sechdr, unsigned int section)
1540{
1541 long ret;
1542
1543 *size += arch_mod_section_prepend(mod, section);
1544 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1545 *size = ret + sechdr->sh_size;
1546 return ret;
1547}
1548
1549/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1550 might -- code, read-only data, read-write data, small data. Tally
1551 sizes, and place the offsets into sh_entsize fields: high bit means it
1552 belongs in init. */
1553static void layout_sections(struct module *mod,
1554 const Elf_Ehdr *hdr,
1555 Elf_Shdr *sechdrs,
1556 const char *secstrings)
1557{
1558 static unsigned long const masks[][2] = {
1559 /* NOTE: all executable code must be the first section
1560 * in this array; otherwise modify the text_size
1561 * finder in the two loops below */
1562 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1563 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1564 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1565 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1566 };
1567 unsigned int m, i;
1568
1569 for (i = 0; i < hdr->e_shnum; i++)
1570 sechdrs[i].sh_entsize = ~0UL;
1571
1572 DEBUGP("Core section allocation order:\n");
1573 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1574 for (i = 0; i < hdr->e_shnum; ++i) {
1575 Elf_Shdr *s = &sechdrs[i];
1576
1577 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1578 || (s->sh_flags & masks[m][1])
1579 || s->sh_entsize != ~0UL
1580 || strstarts(secstrings + s->sh_name, ".init"))
1581 continue;
1582 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1583 DEBUGP("\t%s\n", secstrings + s->sh_name);
1584 }
1585 if (m == 0)
1586 mod->core_text_size = mod->core_size;
1587 }
1588
1589 DEBUGP("Init section allocation order:\n");
1590 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1591 for (i = 0; i < hdr->e_shnum; ++i) {
1592 Elf_Shdr *s = &sechdrs[i];
1593
1594 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1595 || (s->sh_flags & masks[m][1])
1596 || s->sh_entsize != ~0UL
1597 || !strstarts(secstrings + s->sh_name, ".init"))
1598 continue;
1599 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1600 | INIT_OFFSET_MASK);
1601 DEBUGP("\t%s\n", secstrings + s->sh_name);
1602 }
1603 if (m == 0)
1604 mod->init_text_size = mod->init_size;
1605 }
1606}
1607
1608static void set_license(struct module *mod, const char *license)
1609{
1610 if (!license)
1611 license = "unspecified";
1612
1613 if (!license_is_gpl_compatible(license)) {
1614 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1615 printk(KERN_WARNING "%s: module license '%s' taints "
1616 "kernel.\n", mod->name, license);
1617 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1618 }
1619}
1620
1621/* Parse tag=value strings from .modinfo section */
1622static char *next_string(char *string, unsigned long *secsize)
1623{
1624 /* Skip non-zero chars */
1625 while (string[0]) {
1626 string++;
1627 if ((*secsize)-- <= 1)
1628 return NULL;
1629 }
1630
1631 /* Skip any zero padding. */
1632 while (!string[0]) {
1633 string++;
1634 if ((*secsize)-- <= 1)
1635 return NULL;
1636 }
1637 return string;
1638}
1639
1640static char *get_modinfo(Elf_Shdr *sechdrs,
1641 unsigned int info,
1642 const char *tag)
1643{
1644 char *p;
1645 unsigned int taglen = strlen(tag);
1646 unsigned long size = sechdrs[info].sh_size;
1647
1648 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1649 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1650 return p + taglen + 1;
1651 }
1652 return NULL;
1653}
1654
1655static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1656 unsigned int infoindex)
1657{
1658 struct module_attribute *attr;
1659 int i;
1660
1661 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1662 if (attr->setup)
1663 attr->setup(mod,
1664 get_modinfo(sechdrs,
1665 infoindex,
1666 attr->attr.name));
1667 }
1668}
1669
1670static void free_modinfo(struct module *mod)
1671{
1672 struct module_attribute *attr;
1673 int i;
1674
1675 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1676 if (attr->free)
1677 attr->free(mod);
1678 }
1679}
1680
1681#ifdef CONFIG_KALLSYMS
1682
1683/* lookup symbol in given range of kernel_symbols */
1684static const struct kernel_symbol *lookup_symbol(const char *name,
1685 const struct kernel_symbol *start,
1686 const struct kernel_symbol *stop)
1687{
1688 const struct kernel_symbol *ks = start;
1689 for (; ks < stop; ks++)
1690 if (strcmp(ks->name, name) == 0)
1691 return ks;
1692 return NULL;
1693}
1694
1695static int is_exported(const char *name, unsigned long value,
1696 const struct module *mod)
1697{
1698 const struct kernel_symbol *ks;
1699 if (!mod)
1700 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1701 else
1702 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1703 return ks != NULL && ks->value == value;
1704}
1705
1706/* As per nm */
1707static char elf_type(const Elf_Sym *sym,
1708 Elf_Shdr *sechdrs,
1709 const char *secstrings,
1710 struct module *mod)
1711{
1712 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1713 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1714 return 'v';
1715 else
1716 return 'w';
1717 }
1718 if (sym->st_shndx == SHN_UNDEF)
1719 return 'U';
1720 if (sym->st_shndx == SHN_ABS)
1721 return 'a';
1722 if (sym->st_shndx >= SHN_LORESERVE)
1723 return '?';
1724 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1725 return 't';
1726 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1727 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1728 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1729 return 'r';
1730 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1731 return 'g';
1732 else
1733 return 'd';
1734 }
1735 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1736 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1737 return 's';
1738 else
1739 return 'b';
1740 }
1741 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1742 return 'n';
1743 return '?';
1744}
1745
1746static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1747 unsigned int shnum)
1748{
1749 const Elf_Shdr *sec;
1750
1751 if (src->st_shndx == SHN_UNDEF
1752 || src->st_shndx >= shnum
1753 || !src->st_name)
1754 return false;
1755
1756 sec = sechdrs + src->st_shndx;
1757 if (!(sec->sh_flags & SHF_ALLOC)
1758#ifndef CONFIG_KALLSYMS_ALL
1759 || !(sec->sh_flags & SHF_EXECINSTR)
1760#endif
1761 || (sec->sh_entsize & INIT_OFFSET_MASK))
1762 return false;
1763
1764 return true;
1765}
1766
1767static unsigned long layout_symtab(struct module *mod,
1768 Elf_Shdr *sechdrs,
1769 unsigned int symindex,
1770 unsigned int strindex,
1771 const Elf_Ehdr *hdr,
1772 const char *secstrings,
1773 unsigned long *pstroffs,
1774 unsigned long *strmap)
1775{
1776 unsigned long symoffs;
1777 Elf_Shdr *symsect = sechdrs + symindex;
1778 Elf_Shdr *strsect = sechdrs + strindex;
1779 const Elf_Sym *src;
1780 const char *strtab;
1781 unsigned int i, nsrc, ndst;
1782
1783 /* Put symbol section at end of init part of module. */
1784 symsect->sh_flags |= SHF_ALLOC;
1785 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1786 symindex) | INIT_OFFSET_MASK;
1787 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1788
1789 src = (void *)hdr + symsect->sh_offset;
1790 nsrc = symsect->sh_size / sizeof(*src);
1791 strtab = (void *)hdr + strsect->sh_offset;
1792 for (ndst = i = 1; i < nsrc; ++i, ++src)
1793 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1794 unsigned int j = src->st_name;
1795
1796 while(!__test_and_set_bit(j, strmap) && strtab[j])
1797 ++j;
1798 ++ndst;
1799 }
1800
1801 /* Append room for core symbols at end of core part. */
1802 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1803 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1804
1805 /* Put string table section at end of init part of module. */
1806 strsect->sh_flags |= SHF_ALLOC;
1807 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1808 strindex) | INIT_OFFSET_MASK;
1809 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1810
1811 /* Append room for core symbols' strings at end of core part. */
1812 *pstroffs = mod->core_size;
1813 __set_bit(0, strmap);
1814 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1815
1816 return symoffs;
1817}
1818
1819static void add_kallsyms(struct module *mod,
1820 Elf_Shdr *sechdrs,
1821 unsigned int shnum,
1822 unsigned int symindex,
1823 unsigned int strindex,
1824 unsigned long symoffs,
1825 unsigned long stroffs,
1826 const char *secstrings,
1827 unsigned long *strmap)
1828{
1829 unsigned int i, ndst;
1830 const Elf_Sym *src;
1831 Elf_Sym *dst;
1832 char *s;
1833
1834 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1835 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1836 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1837
1838 /* Set types up while we still have access to sections. */
1839 for (i = 0; i < mod->num_symtab; i++)
1840 mod->symtab[i].st_info
1841 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1842
1843 mod->core_symtab = dst = mod->module_core + symoffs;
1844 src = mod->symtab;
1845 *dst = *src;
1846 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1847 if (!is_core_symbol(src, sechdrs, shnum))
1848 continue;
1849 dst[ndst] = *src;
1850 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
1851 ++ndst;
1852 }
1853 mod->core_num_syms = ndst;
1854
1855 mod->core_strtab = s = mod->module_core + stroffs;
1856 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1857 if (test_bit(i, strmap))
1858 *++s = mod->strtab[i];
1859}
1860#else
1861static inline unsigned long layout_symtab(struct module *mod,
1862 Elf_Shdr *sechdrs,
1863 unsigned int symindex,
1864 unsigned int strindex,
1865 const Elf_Ehdr *hdr,
1866 const char *secstrings,
1867 unsigned long *pstroffs,
1868 unsigned long *strmap)
1869{
1870 return 0;
1871}
1872
1873static inline void add_kallsyms(struct module *mod,
1874 Elf_Shdr *sechdrs,
1875 unsigned int shnum,
1876 unsigned int symindex,
1877 unsigned int strindex,
1878 unsigned long symoffs,
1879 unsigned long stroffs,
1880 const char *secstrings,
1881 const unsigned long *strmap)
1882{
1883}
1884#endif /* CONFIG_KALLSYMS */
1885
1886static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1887{
1888#ifdef CONFIG_DYNAMIC_DEBUG
1889 if (ddebug_add_module(debug, num, debug->modname))
1890 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1891 debug->modname);
1892#endif
1893}
1894
1895static void *module_alloc_update_bounds(unsigned long size)
1896{
1897 void *ret = module_alloc(size);
1898
1899 if (ret) {
1900 /* Update module bounds. */
1901 if ((unsigned long)ret < module_addr_min)
1902 module_addr_min = (unsigned long)ret;
1903 if ((unsigned long)ret + size > module_addr_max)
1904 module_addr_max = (unsigned long)ret + size;
1905 }
1906 return ret;
1907}
1908
1909#ifdef CONFIG_DEBUG_KMEMLEAK
1910static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1911 Elf_Shdr *sechdrs, char *secstrings)
1912{
1913 unsigned int i;
1914
1915 /* only scan the sections containing data */
1916 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
1917
1918 for (i = 1; i < hdr->e_shnum; i++) {
1919 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1920 continue;
1921 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
1922 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
1923 continue;
1924
1925 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
1926 sechdrs[i].sh_size, GFP_KERNEL);
1927 }
1928}
1929#else
1930static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1931 Elf_Shdr *sechdrs, char *secstrings)
1932{
1933}
1934#endif
1935
1936/* Allocate and load the module: note that size of section 0 is always
1937 zero, and we rely on this for optional sections. */
1938static noinline struct module *load_module(void __user *umod,
1939 unsigned long len,
1940 const char __user *uargs)
1941{
1942 Elf_Ehdr *hdr;
1943 Elf_Shdr *sechdrs;
1944 char *secstrings, *args, *modmagic, *strtab = NULL;
1945 char *staging;
1946 unsigned int i;
1947 unsigned int symindex = 0;
1948 unsigned int strindex = 0;
1949 unsigned int modindex, versindex, infoindex, pcpuindex;
1950 struct module *mod;
1951 long err = 0;
1952 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1953 unsigned long symoffs, stroffs, *strmap;
1954
1955 mm_segment_t old_fs;
1956
1957 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1958 umod, len, uargs);
1959 if (len < sizeof(*hdr))
1960 return ERR_PTR(-ENOEXEC);
1961
1962 /* Suck in entire file: we'll want most of it. */
1963 /* vmalloc barfs on "unusual" numbers. Check here */
1964 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1965 return ERR_PTR(-ENOMEM);
1966
1967 if (copy_from_user(hdr, umod, len) != 0) {
1968 err = -EFAULT;
1969 goto free_hdr;
1970 }
1971
1972 /* Sanity checks against insmoding binaries or wrong arch,
1973 weird elf version */
1974 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1975 || hdr->e_type != ET_REL
1976 || !elf_check_arch(hdr)
1977 || hdr->e_shentsize != sizeof(*sechdrs)) {
1978 err = -ENOEXEC;
1979 goto free_hdr;
1980 }
1981
1982 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1983 goto truncated;
1984
1985 /* Convenience variables */
1986 sechdrs = (void *)hdr + hdr->e_shoff;
1987 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1988 sechdrs[0].sh_addr = 0;
1989
1990 for (i = 1; i < hdr->e_shnum; i++) {
1991 if (sechdrs[i].sh_type != SHT_NOBITS
1992 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1993 goto truncated;
1994
1995 /* Mark all sections sh_addr with their address in the
1996 temporary image. */
1997 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1998
1999 /* Internal symbols and strings. */
2000 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2001 symindex = i;
2002 strindex = sechdrs[i].sh_link;
2003 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2004 }
2005#ifndef CONFIG_MODULE_UNLOAD
2006 /* Don't load .exit sections */
2007 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
2008 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2009#endif
2010 }
2011
2012 modindex = find_sec(hdr, sechdrs, secstrings,
2013 ".gnu.linkonce.this_module");
2014 if (!modindex) {
2015 printk(KERN_WARNING "No module found in object\n");
2016 err = -ENOEXEC;
2017 goto free_hdr;
2018 }
2019 /* This is temporary: point mod into copy of data. */
2020 mod = (void *)sechdrs[modindex].sh_addr;
2021
2022 if (symindex == 0) {
2023 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2024 mod->name);
2025 err = -ENOEXEC;
2026 goto free_hdr;
2027 }
2028
2029 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2030 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2031 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2032
2033 /* Don't keep modinfo and version sections. */
2034 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2035 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2036
2037 /* Check module struct version now, before we try to use module. */
2038 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2039 err = -ENOEXEC;
2040 goto free_hdr;
2041 }
2042
2043 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2044 /* This is allowed: modprobe --force will invalidate it. */
2045 if (!modmagic) {
2046 err = try_to_force_load(mod, "bad vermagic");
2047 if (err)
2048 goto free_hdr;
2049 } else if (!same_magic(modmagic, vermagic, versindex)) {
2050 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2051 mod->name, modmagic, vermagic);
2052 err = -ENOEXEC;
2053 goto free_hdr;
2054 }
2055
2056 staging = get_modinfo(sechdrs, infoindex, "staging");
2057 if (staging) {
2058 add_taint_module(mod, TAINT_CRAP);
2059 printk(KERN_WARNING "%s: module is from the staging directory,"
2060 " the quality is unknown, you have been warned.\n",
2061 mod->name);
2062 }
2063
2064 /* Now copy in args */
2065 args = strndup_user(uargs, ~0UL >> 1);
2066 if (IS_ERR(args)) {
2067 err = PTR_ERR(args);
2068 goto free_hdr;
2069 }
2070
2071 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2072 * sizeof(long), GFP_KERNEL);
2073 if (!strmap) {
2074 err = -ENOMEM;
2075 goto free_mod;
2076 }
2077
2078 if (find_module(mod->name)) {
2079 err = -EEXIST;
2080 goto free_mod;
2081 }
2082
2083 mod->state = MODULE_STATE_COMING;
2084
2085 /* Allow arches to frob section contents and sizes. */
2086 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2087 if (err < 0)
2088 goto free_mod;
2089
2090 if (pcpuindex) {
2091 /* We have a special allocation for this section. */
2092 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2093 sechdrs[pcpuindex].sh_addralign,
2094 mod->name);
2095 if (!percpu) {
2096 err = -ENOMEM;
2097 goto free_mod;
2098 }
2099 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2100 mod->percpu = percpu;
2101 }
2102
2103 /* Determine total sizes, and put offsets in sh_entsize. For now
2104 this is done generically; there doesn't appear to be any
2105 special cases for the architectures. */
2106 layout_sections(mod, hdr, sechdrs, secstrings);
2107 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2108 secstrings, &stroffs, strmap);
2109
2110 /* Do the allocs. */
2111 ptr = module_alloc_update_bounds(mod->core_size);
2112 /*
2113 * The pointer to this block is stored in the module structure
2114 * which is inside the block. Just mark it as not being a
2115 * leak.
2116 */
2117 kmemleak_not_leak(ptr);
2118 if (!ptr) {
2119 err = -ENOMEM;
2120 goto free_percpu;
2121 }
2122 memset(ptr, 0, mod->core_size);
2123 mod->module_core = ptr;
2124
2125 ptr = module_alloc_update_bounds(mod->init_size);
2126 /*
2127 * The pointer to this block is stored in the module structure
2128 * which is inside the block. This block doesn't need to be
2129 * scanned as it contains data and code that will be freed
2130 * after the module is initialized.
2131 */
2132 kmemleak_ignore(ptr);
2133 if (!ptr && mod->init_size) {
2134 err = -ENOMEM;
2135 goto free_core;
2136 }
2137 memset(ptr, 0, mod->init_size);
2138 mod->module_init = ptr;
2139
2140 /* Transfer each section which specifies SHF_ALLOC */
2141 DEBUGP("final section addresses:\n");
2142 for (i = 0; i < hdr->e_shnum; i++) {
2143 void *dest;
2144
2145 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2146 continue;
2147
2148 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2149 dest = mod->module_init
2150 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2151 else
2152 dest = mod->module_core + sechdrs[i].sh_entsize;
2153
2154 if (sechdrs[i].sh_type != SHT_NOBITS)
2155 memcpy(dest, (void *)sechdrs[i].sh_addr,
2156 sechdrs[i].sh_size);
2157 /* Update sh_addr to point to copy in image. */
2158 sechdrs[i].sh_addr = (unsigned long)dest;
2159 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2160 }
2161 /* Module has been moved. */
2162 mod = (void *)sechdrs[modindex].sh_addr;
2163 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2164
2165#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2166 mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
2167 mod->name);
2168 if (!mod->refptr) {
2169 err = -ENOMEM;
2170 goto free_init;
2171 }
2172#endif
2173 /* Now we've moved module, initialize linked lists, etc. */
2174 module_unload_init(mod);
2175
2176 /* add kobject, so we can reference it. */
2177 err = mod_sysfs_init(mod);
2178 if (err)
2179 goto free_unload;
2180
2181 /* Set up license info based on the info section */
2182 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2183
2184 /*
2185 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2186 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2187 * using GPL-only symbols it needs.
2188 */
2189 if (strcmp(mod->name, "ndiswrapper") == 0)
2190 add_taint(TAINT_PROPRIETARY_MODULE);
2191
2192 /* driverloader was caught wrongly pretending to be under GPL */
2193 if (strcmp(mod->name, "driverloader") == 0)
2194 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2195
2196 /* Set up MODINFO_ATTR fields */
2197 setup_modinfo(mod, sechdrs, infoindex);
2198
2199 /* Fix up syms, so that st_value is a pointer to location. */
2200 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2201 mod);
2202 if (err < 0)
2203 goto cleanup;
2204
2205 /* Now we've got everything in the final locations, we can
2206 * find optional sections. */
2207 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2208 sizeof(*mod->kp), &mod->num_kp);
2209 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2210 sizeof(*mod->syms), &mod->num_syms);
2211 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2212 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2213 sizeof(*mod->gpl_syms),
2214 &mod->num_gpl_syms);
2215 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2216 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2217 "__ksymtab_gpl_future",
2218 sizeof(*mod->gpl_future_syms),
2219 &mod->num_gpl_future_syms);
2220 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2221 "__kcrctab_gpl_future");
2222
2223#ifdef CONFIG_UNUSED_SYMBOLS
2224 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2225 "__ksymtab_unused",
2226 sizeof(*mod->unused_syms),
2227 &mod->num_unused_syms);
2228 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2229 "__kcrctab_unused");
2230 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2231 "__ksymtab_unused_gpl",
2232 sizeof(*mod->unused_gpl_syms),
2233 &mod->num_unused_gpl_syms);
2234 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2235 "__kcrctab_unused_gpl");
2236#endif
2237#ifdef CONFIG_CONSTRUCTORS
2238 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2239 sizeof(*mod->ctors), &mod->num_ctors);
2240#endif
2241
2242#ifdef CONFIG_TRACEPOINTS
2243 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2244 "__tracepoints",
2245 sizeof(*mod->tracepoints),
2246 &mod->num_tracepoints);
2247#endif
2248#ifdef CONFIG_EVENT_TRACING
2249 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2250 "_ftrace_events",
2251 sizeof(*mod->trace_events),
2252 &mod->num_trace_events);
2253 /*
2254 * This section contains pointers to allocated objects in the trace
2255 * code and not scanning it leads to false positives.
2256 */
2257 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2258 mod->num_trace_events, GFP_KERNEL);
2259#endif
2260#ifdef CONFIG_FTRACE_MCOUNT_RECORD
2261 /* sechdrs[0].sh_size is always zero */
2262 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2263 "__mcount_loc",
2264 sizeof(*mod->ftrace_callsites),
2265 &mod->num_ftrace_callsites);
2266#endif
2267#ifdef CONFIG_MODVERSIONS
2268 if ((mod->num_syms && !mod->crcs)
2269 || (mod->num_gpl_syms && !mod->gpl_crcs)
2270 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2271#ifdef CONFIG_UNUSED_SYMBOLS
2272 || (mod->num_unused_syms && !mod->unused_crcs)
2273 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2274#endif
2275 ) {
2276 err = try_to_force_load(mod,
2277 "no versions for exported symbols");
2278 if (err)
2279 goto cleanup;
2280 }
2281#endif
2282
2283 /* Now do relocations. */
2284 for (i = 1; i < hdr->e_shnum; i++) {
2285 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2286 unsigned int info = sechdrs[i].sh_info;
2287
2288 /* Not a valid relocation section? */
2289 if (info >= hdr->e_shnum)
2290 continue;
2291
2292 /* Don't bother with non-allocated sections */
2293 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2294 continue;
2295
2296 if (sechdrs[i].sh_type == SHT_REL)
2297 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2298 else if (sechdrs[i].sh_type == SHT_RELA)
2299 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2300 mod);
2301 if (err < 0)
2302 goto cleanup;
2303 }
2304
2305 /* Find duplicate symbols */
2306 err = verify_export_symbols(mod);
2307 if (err < 0)
2308 goto cleanup;
2309
2310 /* Set up and sort exception table */
2311 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2312 sizeof(*mod->extable), &mod->num_exentries);
2313 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2314
2315 /* Finally, copy percpu area over. */
2316 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2317 sechdrs[pcpuindex].sh_size);
2318
2319 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2320 symoffs, stroffs, secstrings, strmap);
2321 kfree(strmap);
2322 strmap = NULL;
2323
2324 if (!mod->taints) {
2325 struct _ddebug *debug;
2326 unsigned int num_debug;
2327
2328 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2329 sizeof(*debug), &num_debug);
2330 if (debug)
2331 dynamic_debug_setup(debug, num_debug);
2332 }
2333
2334 err = module_finalize(hdr, sechdrs, mod);
2335 if (err < 0)
2336 goto cleanup;
2337
2338 /* flush the icache in correct context */
2339 old_fs = get_fs();
2340 set_fs(KERNEL_DS);
2341
2342 /*
2343 * Flush the instruction cache, since we've played with text.
2344 * Do it before processing of module parameters, so the module
2345 * can provide parameter accessor functions of its own.
2346 */
2347 if (mod->module_init)
2348 flush_icache_range((unsigned long)mod->module_init,
2349 (unsigned long)mod->module_init
2350 + mod->init_size);
2351 flush_icache_range((unsigned long)mod->module_core,
2352 (unsigned long)mod->module_core + mod->core_size);
2353
2354 set_fs(old_fs);
2355
2356 mod->args = args;
2357 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2358 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2359 mod->name);
2360
2361 /* Now sew it into the lists so we can get lockdep and oops
2362 * info during argument parsing. Noone should access us, since
2363 * strong_try_module_get() will fail.
2364 * lockdep/oops can run asynchronous, so use the RCU list insertion
2365 * function to insert in a way safe to concurrent readers.
2366 * The mutex protects against concurrent writers.
2367 */
2368 list_add_rcu(&mod->list, &modules);
2369
2370 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2371 if (err < 0)
2372 goto unlink;
2373
2374 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2375 if (err < 0)
2376 goto unlink;
2377 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2378 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2379
2380 /* Get rid of temporary copy */
2381 vfree(hdr);
2382
2383 trace_module_load(mod);
2384
2385 /* Done! */
2386 return mod;
2387
2388 unlink:
2389 /* Unlink carefully: kallsyms could be walking list. */
2390 list_del_rcu(&mod->list);
2391 synchronize_sched();
2392 module_arch_cleanup(mod);
2393 cleanup:
2394 free_modinfo(mod);
2395 kobject_del(&mod->mkobj.kobj);
2396 kobject_put(&mod->mkobj.kobj);
2397 free_unload:
2398 module_unload_free(mod);
2399#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2400 percpu_modfree(mod->refptr);
2401 free_init:
2402#endif
2403 module_free(mod, mod->module_init);
2404 free_core:
2405 module_free(mod, mod->module_core);
2406 /* mod will be freed with core. Don't access it beyond this line! */
2407 free_percpu:
2408 if (percpu)
2409 percpu_modfree(percpu);
2410 free_mod:
2411 kfree(args);
2412 kfree(strmap);
2413 free_hdr:
2414 vfree(hdr);
2415 return ERR_PTR(err);
2416
2417 truncated:
2418 printk(KERN_ERR "Module len %lu truncated\n", len);
2419 err = -ENOEXEC;
2420 goto free_hdr;
2421}
2422
2423/* Call module constructors. */
2424static void do_mod_ctors(struct module *mod)
2425{
2426#ifdef CONFIG_CONSTRUCTORS
2427 unsigned long i;
2428
2429 for (i = 0; i < mod->num_ctors; i++)
2430 mod->ctors[i]();
2431#endif
2432}
2433
2434/* This is where the real work happens */
2435SYSCALL_DEFINE3(init_module, void __user *, umod,
2436 unsigned long, len, const char __user *, uargs)
2437{
2438 struct module *mod;
2439 int ret = 0;
2440
2441 /* Must have permission */
2442 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2443 return -EPERM;
2444
2445 /* Only one module load at a time, please */
2446 if (mutex_lock_interruptible(&module_mutex) != 0)
2447 return -EINTR;
2448
2449 /* Do all the hard work */
2450 mod = load_module(umod, len, uargs);
2451 if (IS_ERR(mod)) {
2452 mutex_unlock(&module_mutex);
2453 return PTR_ERR(mod);
2454 }
2455
2456 /* Drop lock so they can recurse */
2457 mutex_unlock(&module_mutex);
2458
2459 blocking_notifier_call_chain(&module_notify_list,
2460 MODULE_STATE_COMING, mod);
2461
2462 do_mod_ctors(mod);
2463 /* Start the module */
2464 if (mod->init != NULL)
2465 ret = do_one_initcall(mod->init);
2466 if (ret < 0) {
2467 /* Init routine failed: abort. Try to protect us from
2468 buggy refcounters. */
2469 mod->state = MODULE_STATE_GOING;
2470 synchronize_sched();
2471 module_put(mod);
2472 blocking_notifier_call_chain(&module_notify_list,
2473 MODULE_STATE_GOING, mod);
2474 mutex_lock(&module_mutex);
2475 free_module(mod);
2476 mutex_unlock(&module_mutex);
2477 wake_up(&module_wq);
2478 return ret;
2479 }
2480 if (ret > 0) {
2481 printk(KERN_WARNING
2482"%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2483"%s: loading module anyway...\n",
2484 __func__, mod->name, ret,
2485 __func__);
2486 dump_stack();
2487 }
2488
2489 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2490 mod->state = MODULE_STATE_LIVE;
2491 wake_up(&module_wq);
2492 blocking_notifier_call_chain(&module_notify_list,
2493 MODULE_STATE_LIVE, mod);
2494
2495 /* We need to finish all async code before the module init sequence is done */
2496 async_synchronize_full();
2497
2498 mutex_lock(&module_mutex);
2499 /* Drop initial reference. */
2500 module_put(mod);
2501 trim_init_extable(mod);
2502#ifdef CONFIG_KALLSYMS
2503 mod->num_symtab = mod->core_num_syms;
2504 mod->symtab = mod->core_symtab;
2505 mod->strtab = mod->core_strtab;
2506#endif
2507 module_free(mod, mod->module_init);
2508 mod->module_init = NULL;
2509 mod->init_size = 0;
2510 mod->init_text_size = 0;
2511 mutex_unlock(&module_mutex);
2512
2513 return 0;
2514}
2515
2516static inline int within(unsigned long addr, void *start, unsigned long size)
2517{
2518 return ((void *)addr >= start && (void *)addr < start + size);
2519}
2520
2521#ifdef CONFIG_KALLSYMS
2522/*
2523 * This ignores the intensely annoying "mapping symbols" found
2524 * in ARM ELF files: $a, $t and $d.
2525 */
2526static inline int is_arm_mapping_symbol(const char *str)
2527{
2528 return str[0] == '$' && strchr("atd", str[1])
2529 && (str[2] == '\0' || str[2] == '.');
2530}
2531
2532static const char *get_ksymbol(struct module *mod,
2533 unsigned long addr,
2534 unsigned long *size,
2535 unsigned long *offset)
2536{
2537 unsigned int i, best = 0;
2538 unsigned long nextval;
2539
2540 /* At worse, next value is at end of module */
2541 if (within_module_init(addr, mod))
2542 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2543 else
2544 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2545
2546 /* Scan for closest preceeding symbol, and next symbol. (ELF
2547 starts real symbols at 1). */
2548 for (i = 1; i < mod->num_symtab; i++) {
2549 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2550 continue;
2551
2552 /* We ignore unnamed symbols: they're uninformative
2553 * and inserted at a whim. */
2554 if (mod->symtab[i].st_value <= addr
2555 && mod->symtab[i].st_value > mod->symtab[best].st_value
2556 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2557 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2558 best = i;
2559 if (mod->symtab[i].st_value > addr
2560 && mod->symtab[i].st_value < nextval
2561 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2562 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2563 nextval = mod->symtab[i].st_value;
2564 }
2565
2566 if (!best)
2567 return NULL;
2568
2569 if (size)
2570 *size = nextval - mod->symtab[best].st_value;
2571 if (offset)
2572 *offset = addr - mod->symtab[best].st_value;
2573 return mod->strtab + mod->symtab[best].st_name;
2574}
2575
2576/* For kallsyms to ask for address resolution. NULL means not found. Careful
2577 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2578const char *module_address_lookup(unsigned long addr,
2579 unsigned long *size,
2580 unsigned long *offset,
2581 char **modname,
2582 char *namebuf)
2583{
2584 struct module *mod;
2585 const char *ret = NULL;
2586
2587 preempt_disable();
2588 list_for_each_entry_rcu(mod, &modules, list) {
2589 if (within_module_init(addr, mod) ||
2590 within_module_core(addr, mod)) {
2591 if (modname)
2592 *modname = mod->name;
2593 ret = get_ksymbol(mod, addr, size, offset);
2594 break;
2595 }
2596 }
2597 /* Make a copy in here where it's safe */
2598 if (ret) {
2599 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2600 ret = namebuf;
2601 }
2602 preempt_enable();
2603 return ret;
2604}
2605
2606int lookup_module_symbol_name(unsigned long addr, char *symname)
2607{
2608 struct module *mod;
2609
2610 preempt_disable();
2611 list_for_each_entry_rcu(mod, &modules, list) {
2612 if (within_module_init(addr, mod) ||
2613 within_module_core(addr, mod)) {
2614 const char *sym;
2615
2616 sym = get_ksymbol(mod, addr, NULL, NULL);
2617 if (!sym)
2618 goto out;
2619 strlcpy(symname, sym, KSYM_NAME_LEN);
2620 preempt_enable();
2621 return 0;
2622 }
2623 }
2624out:
2625 preempt_enable();
2626 return -ERANGE;
2627}
2628
2629int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2630 unsigned long *offset, char *modname, char *name)
2631{
2632 struct module *mod;
2633
2634 preempt_disable();
2635 list_for_each_entry_rcu(mod, &modules, list) {
2636 if (within_module_init(addr, mod) ||
2637 within_module_core(addr, mod)) {
2638 const char *sym;
2639
2640 sym = get_ksymbol(mod, addr, size, offset);
2641 if (!sym)
2642 goto out;
2643 if (modname)
2644 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2645 if (name)
2646 strlcpy(name, sym, KSYM_NAME_LEN);
2647 preempt_enable();
2648 return 0;
2649 }
2650 }
2651out:
2652 preempt_enable();
2653 return -ERANGE;
2654}
2655
2656int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2657 char *name, char *module_name, int *exported)
2658{
2659 struct module *mod;
2660
2661 preempt_disable();
2662 list_for_each_entry_rcu(mod, &modules, list) {
2663 if (symnum < mod->num_symtab) {
2664 *value = mod->symtab[symnum].st_value;
2665 *type = mod->symtab[symnum].st_info;
2666 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2667 KSYM_NAME_LEN);
2668 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2669 *exported = is_exported(name, *value, mod);
2670 preempt_enable();
2671 return 0;
2672 }
2673 symnum -= mod->num_symtab;
2674 }
2675 preempt_enable();
2676 return -ERANGE;
2677}
2678
2679static unsigned long mod_find_symname(struct module *mod, const char *name)
2680{
2681 unsigned int i;
2682
2683 for (i = 0; i < mod->num_symtab; i++)
2684 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2685 mod->symtab[i].st_info != 'U')
2686 return mod->symtab[i].st_value;
2687 return 0;
2688}
2689
2690/* Look for this name: can be of form module:name. */
2691unsigned long module_kallsyms_lookup_name(const char *name)
2692{
2693 struct module *mod;
2694 char *colon;
2695 unsigned long ret = 0;
2696
2697 /* Don't lock: we're in enough trouble already. */
2698 preempt_disable();
2699 if ((colon = strchr(name, ':')) != NULL) {
2700 *colon = '\0';
2701 if ((mod = find_module(name)) != NULL)
2702 ret = mod_find_symname(mod, colon+1);
2703 *colon = ':';
2704 } else {
2705 list_for_each_entry_rcu(mod, &modules, list)
2706 if ((ret = mod_find_symname(mod, name)) != 0)
2707 break;
2708 }
2709 preempt_enable();
2710 return ret;
2711}
2712
2713int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2714 struct module *, unsigned long),
2715 void *data)
2716{
2717 struct module *mod;
2718 unsigned int i;
2719 int ret;
2720
2721 list_for_each_entry(mod, &modules, list) {
2722 for (i = 0; i < mod->num_symtab; i++) {
2723 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2724 mod, mod->symtab[i].st_value);
2725 if (ret != 0)
2726 return ret;
2727 }
2728 }
2729 return 0;
2730}
2731#endif /* CONFIG_KALLSYMS */
2732
2733static char *module_flags(struct module *mod, char *buf)
2734{
2735 int bx = 0;
2736
2737 if (mod->taints ||
2738 mod->state == MODULE_STATE_GOING ||
2739 mod->state == MODULE_STATE_COMING) {
2740 buf[bx++] = '(';
2741 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2742 buf[bx++] = 'P';
2743 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2744 buf[bx++] = 'F';
2745 if (mod->taints & (1 << TAINT_CRAP))
2746 buf[bx++] = 'C';
2747 /*
2748 * TAINT_FORCED_RMMOD: could be added.
2749 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2750 * apply to modules.
2751 */
2752
2753 /* Show a - for module-is-being-unloaded */
2754 if (mod->state == MODULE_STATE_GOING)
2755 buf[bx++] = '-';
2756 /* Show a + for module-is-being-loaded */
2757 if (mod->state == MODULE_STATE_COMING)
2758 buf[bx++] = '+';
2759 buf[bx++] = ')';
2760 }
2761 buf[bx] = '\0';
2762
2763 return buf;
2764}
2765
2766#ifdef CONFIG_PROC_FS
2767/* Called by the /proc file system to return a list of modules. */
2768static void *m_start(struct seq_file *m, loff_t *pos)
2769{
2770 mutex_lock(&module_mutex);
2771 return seq_list_start(&modules, *pos);
2772}
2773
2774static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2775{
2776 return seq_list_next(p, &modules, pos);
2777}
2778
2779static void m_stop(struct seq_file *m, void *p)
2780{
2781 mutex_unlock(&module_mutex);
2782}
2783
2784static int m_show(struct seq_file *m, void *p)
2785{
2786 struct module *mod = list_entry(p, struct module, list);
2787 char buf[8];
2788
2789 seq_printf(m, "%s %u",
2790 mod->name, mod->init_size + mod->core_size);
2791 print_unload_info(m, mod);
2792
2793 /* Informative for users. */
2794 seq_printf(m, " %s",
2795 mod->state == MODULE_STATE_GOING ? "Unloading":
2796 mod->state == MODULE_STATE_COMING ? "Loading":
2797 "Live");
2798 /* Used by oprofile and other similar tools. */
2799 seq_printf(m, " 0x%p", mod->module_core);
2800
2801 /* Taints info */
2802 if (mod->taints)
2803 seq_printf(m, " %s", module_flags(mod, buf));
2804
2805 seq_printf(m, "\n");
2806 return 0;
2807}
2808
2809/* Format: modulename size refcount deps address
2810
2811 Where refcount is a number or -, and deps is a comma-separated list
2812 of depends or -.
2813*/
2814static const struct seq_operations modules_op = {
2815 .start = m_start,
2816 .next = m_next,
2817 .stop = m_stop,
2818 .show = m_show
2819};
2820
2821static int modules_open(struct inode *inode, struct file *file)
2822{
2823 return seq_open(file, &modules_op);
2824}
2825
2826static const struct file_operations proc_modules_operations = {
2827 .open = modules_open,
2828 .read = seq_read,
2829 .llseek = seq_lseek,
2830 .release = seq_release,
2831};
2832
2833static int __init proc_modules_init(void)
2834{
2835 proc_create("modules", 0, NULL, &proc_modules_operations);
2836 return 0;
2837}
2838module_init(proc_modules_init);
2839#endif
2840
2841/* Given an address, look for it in the module exception tables. */
2842const struct exception_table_entry *search_module_extables(unsigned long addr)
2843{
2844 const struct exception_table_entry *e = NULL;
2845 struct module *mod;
2846
2847 preempt_disable();
2848 list_for_each_entry_rcu(mod, &modules, list) {
2849 if (mod->num_exentries == 0)
2850 continue;
2851
2852 e = search_extable(mod->extable,
2853 mod->extable + mod->num_exentries - 1,
2854 addr);
2855 if (e)
2856 break;
2857 }
2858 preempt_enable();
2859
2860 /* Now, if we found one, we are running inside it now, hence
2861 we cannot unload the module, hence no refcnt needed. */
2862 return e;
2863}
2864
2865/*
2866 * is_module_address - is this address inside a module?
2867 * @addr: the address to check.
2868 *
2869 * See is_module_text_address() if you simply want to see if the address
2870 * is code (not data).
2871 */
2872bool is_module_address(unsigned long addr)
2873{
2874 bool ret;
2875
2876 preempt_disable();
2877 ret = __module_address(addr) != NULL;
2878 preempt_enable();
2879
2880 return ret;
2881}
2882
2883/*
2884 * __module_address - get the module which contains an address.
2885 * @addr: the address.
2886 *
2887 * Must be called with preempt disabled or module mutex held so that
2888 * module doesn't get freed during this.
2889 */
2890struct module *__module_address(unsigned long addr)
2891{
2892 struct module *mod;
2893
2894 if (addr < module_addr_min || addr > module_addr_max)
2895 return NULL;
2896
2897 list_for_each_entry_rcu(mod, &modules, list)
2898 if (within_module_core(addr, mod)
2899 || within_module_init(addr, mod))
2900 return mod;
2901 return NULL;
2902}
2903EXPORT_SYMBOL_GPL(__module_address);
2904
2905/*
2906 * is_module_text_address - is this address inside module code?
2907 * @addr: the address to check.
2908 *
2909 * See is_module_address() if you simply want to see if the address is
2910 * anywhere in a module. See kernel_text_address() for testing if an
2911 * address corresponds to kernel or module code.
2912 */
2913bool is_module_text_address(unsigned long addr)
2914{
2915 bool ret;
2916
2917 preempt_disable();
2918 ret = __module_text_address(addr) != NULL;
2919 preempt_enable();
2920
2921 return ret;
2922}
2923
2924/*
2925 * __module_text_address - get the module whose code contains an address.
2926 * @addr: the address.
2927 *
2928 * Must be called with preempt disabled or module mutex held so that
2929 * module doesn't get freed during this.
2930 */
2931struct module *__module_text_address(unsigned long addr)
2932{
2933 struct module *mod = __module_address(addr);
2934 if (mod) {
2935 /* Make sure it's within the text section. */
2936 if (!within(addr, mod->module_init, mod->init_text_size)
2937 && !within(addr, mod->module_core, mod->core_text_size))
2938 mod = NULL;
2939 }
2940 return mod;
2941}
2942EXPORT_SYMBOL_GPL(__module_text_address);
2943
2944/* Don't grab lock, we're oopsing. */
2945void print_modules(void)
2946{
2947 struct module *mod;
2948 char buf[8];
2949
2950 printk(KERN_DEFAULT "Modules linked in:");
2951 /* Most callers should already have preempt disabled, but make sure */
2952 preempt_disable();
2953 list_for_each_entry_rcu(mod, &modules, list)
2954 printk(" %s%s", mod->name, module_flags(mod, buf));
2955 preempt_enable();
2956 if (last_unloaded_module[0])
2957 printk(" [last unloaded: %s]", last_unloaded_module);
2958 printk("\n");
2959}
2960
2961#ifdef CONFIG_MODVERSIONS
2962/* Generate the signature for all relevant module structures here.
2963 * If these change, we don't want to try to parse the module. */
2964void module_layout(struct module *mod,
2965 struct modversion_info *ver,
2966 struct kernel_param *kp,
2967 struct kernel_symbol *ks,
2968 struct tracepoint *tp)
2969{
2970}
2971EXPORT_SYMBOL(module_layout);
2972#endif
2973
2974#ifdef CONFIG_TRACEPOINTS
2975void module_update_tracepoints(void)
2976{
2977 struct module *mod;
2978
2979 mutex_lock(&module_mutex);
2980 list_for_each_entry(mod, &modules, list)
2981 if (!mod->taints)
2982 tracepoint_update_probe_range(mod->tracepoints,
2983 mod->tracepoints + mod->num_tracepoints);
2984 mutex_unlock(&module_mutex);
2985}
2986
2987/*
2988 * Returns 0 if current not found.
2989 * Returns 1 if current found.
2990 */
2991int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2992{
2993 struct module *iter_mod;
2994 int found = 0;
2995
2996 mutex_lock(&module_mutex);
2997 list_for_each_entry(iter_mod, &modules, list) {
2998 if (!iter_mod->taints) {
2999 /*
3000 * Sorted module list
3001 */
3002 if (iter_mod < iter->module)
3003 continue;
3004 else if (iter_mod > iter->module)
3005 iter->tracepoint = NULL;
3006 found = tracepoint_get_iter_range(&iter->tracepoint,
3007 iter_mod->tracepoints,
3008 iter_mod->tracepoints
3009 + iter_mod->num_tracepoints);
3010 if (found) {
3011 iter->module = iter_mod;
3012 break;
3013 }
3014 }
3015 }
3016 mutex_unlock(&module_mutex);
3017 return found;
3018}
3019#endif
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