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19#include <linux/export.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/file.h>
25#include <linux/fs.h>
26#include <linux/sysfs.h>
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/vmalloc.h>
30#include <linux/elf.h>
31#include <linux/proc_fs.h>
32#include <linux/security.h>
33#include <linux/seq_file.h>
34#include <linux/syscalls.h>
35#include <linux/fcntl.h>
36#include <linux/rcupdate.h>
37#include <linux/capability.h>
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>
44#include <linux/sched.h>
45#include <linux/stop_machine.h>
46#include <linux/device.h>
47#include <linux/string.h>
48#include <linux/mutex.h>
49#include <linux/rculist.h>
50#include <asm/uaccess.h>
51#include <asm/cacheflush.h>
52#include <asm/mmu_context.h>
53#include <linux/license.h>
54#include <asm/sections.h>
55#include <linux/tracepoint.h>
56#include <linux/ftrace.h>
57#include <linux/async.h>
58#include <linux/percpu.h>
59#include <linux/kmemleak.h>
60#include <linux/jump_label.h>
61#include <linux/pfn.h>
62#include <linux/bsearch.h>
63#include <linux/fips.h>
64#include <uapi/linux/module.h>
65#include "module-internal.h"
66
67#define CREATE_TRACE_POINTS
68#include <trace/events/module.h>
69
70#ifndef ARCH_SHF_SMALL
71#define ARCH_SHF_SMALL 0
72#endif
73
74
75
76
77
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
85
86
87
88
89#define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
90 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
91 PFN_DOWN((unsigned long)BASE) + 1) \
92 : (0UL))
93
94
95#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
96
97
98
99
100
101
102
103DEFINE_MUTEX(module_mutex);
104EXPORT_SYMBOL_GPL(module_mutex);
105static LIST_HEAD(modules);
106#ifdef CONFIG_KGDB_KDB
107struct list_head *kdb_modules = &modules;
108#endif
109
110#ifdef CONFIG_MODULE_SIG
111#ifdef CONFIG_MODULE_SIG_FORCE
112static bool sig_enforce = true;
113#else
114static bool sig_enforce = false;
115
116static int param_set_bool_enable_only(const char *val,
117 const struct kernel_param *kp)
118{
119 int err;
120 bool test;
121 struct kernel_param dummy_kp = *kp;
122
123 dummy_kp.arg = &test;
124
125 err = param_set_bool(val, &dummy_kp);
126 if (err)
127 return err;
128
129
130 if (!test && sig_enforce)
131 return -EROFS;
132
133 if (test)
134 sig_enforce = true;
135 return 0;
136}
137
138static const struct kernel_param_ops param_ops_bool_enable_only = {
139 .flags = KERNEL_PARAM_FL_NOARG,
140 .set = param_set_bool_enable_only,
141 .get = param_get_bool,
142};
143#define param_check_bool_enable_only param_check_bool
144
145module_param(sig_enforce, bool_enable_only, 0644);
146#endif
147#endif
148
149
150int modules_disabled = 0;
151core_param(nomodule, modules_disabled, bint, 0);
152
153
154static DECLARE_WAIT_QUEUE_HEAD(module_wq);
155
156static BLOCKING_NOTIFIER_HEAD(module_notify_list);
157
158
159
160static unsigned long module_addr_min = -1UL, module_addr_max = 0;
161
162int register_module_notifier(struct notifier_block * nb)
163{
164 return blocking_notifier_chain_register(&module_notify_list, nb);
165}
166EXPORT_SYMBOL(register_module_notifier);
167
168int unregister_module_notifier(struct notifier_block * nb)
169{
170 return blocking_notifier_chain_unregister(&module_notify_list, nb);
171}
172EXPORT_SYMBOL(unregister_module_notifier);
173
174struct load_info {
175 Elf_Ehdr *hdr;
176 unsigned long len;
177 Elf_Shdr *sechdrs;
178 char *secstrings, *strtab;
179 unsigned long symoffs, stroffs;
180 struct _ddebug *debug;
181 unsigned int num_debug;
182 bool sig_ok;
183 struct {
184 unsigned int sym, str, mod, vers, info, pcpu;
185 } index;
186};
187
188
189
190static inline int strong_try_module_get(struct module *mod)
191{
192 BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
193 if (mod && mod->state == MODULE_STATE_COMING)
194 return -EBUSY;
195 if (try_module_get(mod))
196 return 0;
197 else
198 return -ENOENT;
199}
200
201static inline void add_taint_module(struct module *mod, unsigned flag,
202 enum lockdep_ok lockdep_ok)
203{
204 add_taint(flag, lockdep_ok);
205 mod->taints |= (1U << flag);
206}
207
208
209
210
211
212void __module_put_and_exit(struct module *mod, long code)
213{
214 module_put(mod);
215 do_exit(code);
216}
217EXPORT_SYMBOL(__module_put_and_exit);
218
219
220static unsigned int find_sec(const struct load_info *info, const char *name)
221{
222 unsigned int i;
223
224 for (i = 1; i < info->hdr->e_shnum; i++) {
225 Elf_Shdr *shdr = &info->sechdrs[i];
226
227 if ((shdr->sh_flags & SHF_ALLOC)
228 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
229 return i;
230 }
231 return 0;
232}
233
234
235static void *section_addr(const struct load_info *info, const char *name)
236{
237
238 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
239}
240
241
242static void *section_objs(const struct load_info *info,
243 const char *name,
244 size_t object_size,
245 unsigned int *num)
246{
247 unsigned int sec = find_sec(info, name);
248
249
250 *num = info->sechdrs[sec].sh_size / object_size;
251 return (void *)info->sechdrs[sec].sh_addr;
252}
253
254
255extern const struct kernel_symbol __start___ksymtab[];
256extern const struct kernel_symbol __stop___ksymtab[];
257extern const struct kernel_symbol __start___ksymtab_gpl[];
258extern const struct kernel_symbol __stop___ksymtab_gpl[];
259extern const struct kernel_symbol __start___ksymtab_gpl_future[];
260extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
261extern const unsigned long __start___kcrctab[];
262extern const unsigned long __start___kcrctab_gpl[];
263extern const unsigned long __start___kcrctab_gpl_future[];
264#ifdef CONFIG_UNUSED_SYMBOLS
265extern const struct kernel_symbol __start___ksymtab_unused[];
266extern const struct kernel_symbol __stop___ksymtab_unused[];
267extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
268extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
269extern const unsigned long __start___kcrctab_unused[];
270extern const unsigned long __start___kcrctab_unused_gpl[];
271#endif
272
273#ifndef CONFIG_MODVERSIONS
274#define symversion(base, idx) NULL
275#else
276#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
277#endif
278
279static bool each_symbol_in_section(const struct symsearch *arr,
280 unsigned int arrsize,
281 struct module *owner,
282 bool (*fn)(const struct symsearch *syms,
283 struct module *owner,
284 void *data),
285 void *data)
286{
287 unsigned int j;
288
289 for (j = 0; j < arrsize; j++) {
290 if (fn(&arr[j], owner, data))
291 return true;
292 }
293
294 return false;
295}
296
297
298bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
299 struct module *owner,
300 void *data),
301 void *data)
302{
303 struct module *mod;
304 static const struct symsearch arr[] = {
305 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
306 NOT_GPL_ONLY, false },
307 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
308 __start___kcrctab_gpl,
309 GPL_ONLY, false },
310 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
311 __start___kcrctab_gpl_future,
312 WILL_BE_GPL_ONLY, false },
313#ifdef CONFIG_UNUSED_SYMBOLS
314 { __start___ksymtab_unused, __stop___ksymtab_unused,
315 __start___kcrctab_unused,
316 NOT_GPL_ONLY, true },
317 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
318 __start___kcrctab_unused_gpl,
319 GPL_ONLY, true },
320#endif
321 };
322
323 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
324 return true;
325
326 list_for_each_entry_rcu(mod, &modules, list) {
327 struct symsearch arr[] = {
328 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
329 NOT_GPL_ONLY, false },
330 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
331 mod->gpl_crcs,
332 GPL_ONLY, false },
333 { mod->gpl_future_syms,
334 mod->gpl_future_syms + mod->num_gpl_future_syms,
335 mod->gpl_future_crcs,
336 WILL_BE_GPL_ONLY, false },
337#ifdef CONFIG_UNUSED_SYMBOLS
338 { mod->unused_syms,
339 mod->unused_syms + mod->num_unused_syms,
340 mod->unused_crcs,
341 NOT_GPL_ONLY, true },
342 { mod->unused_gpl_syms,
343 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
344 mod->unused_gpl_crcs,
345 GPL_ONLY, true },
346#endif
347 };
348
349 if (mod->state == MODULE_STATE_UNFORMED)
350 continue;
351
352 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
353 return true;
354 }
355 return false;
356}
357EXPORT_SYMBOL_GPL(each_symbol_section);
358
359struct find_symbol_arg {
360
361 const char *name;
362 bool gplok;
363 bool warn;
364
365
366 struct module *owner;
367 const unsigned long *crc;
368 const struct kernel_symbol *sym;
369};
370
371static bool check_symbol(const struct symsearch *syms,
372 struct module *owner,
373 unsigned int symnum, void *data)
374{
375 struct find_symbol_arg *fsa = data;
376
377 if (!fsa->gplok) {
378 if (syms->licence == GPL_ONLY)
379 return false;
380 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
381 printk(KERN_WARNING "Symbol %s is being used "
382 "by a non-GPL module, which will not "
383 "be allowed in the future\n", fsa->name);
384 }
385 }
386
387#ifdef CONFIG_UNUSED_SYMBOLS
388 if (syms->unused && fsa->warn) {
389 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
390 "however this module is using it.\n", fsa->name);
391 printk(KERN_WARNING
392 "This symbol will go away in the future.\n");
393 printk(KERN_WARNING
394 "Please evalute if this is the right api to use and if "
395 "it really is, submit a report the linux kernel "
396 "mailinglist together with submitting your code for "
397 "inclusion.\n");
398 }
399#endif
400
401 fsa->owner = owner;
402 fsa->crc = symversion(syms->crcs, symnum);
403 fsa->sym = &syms->start[symnum];
404 return true;
405}
406
407static int cmp_name(const void *va, const void *vb)
408{
409 const char *a;
410 const struct kernel_symbol *b;
411 a = va; b = vb;
412 return strcmp(a, b->name);
413}
414
415static bool find_symbol_in_section(const struct symsearch *syms,
416 struct module *owner,
417 void *data)
418{
419 struct find_symbol_arg *fsa = data;
420 struct kernel_symbol *sym;
421
422 sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
423 sizeof(struct kernel_symbol), cmp_name);
424
425 if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
426 return true;
427
428 return false;
429}
430
431
432
433const struct kernel_symbol *find_symbol(const char *name,
434 struct module **owner,
435 const unsigned long **crc,
436 bool gplok,
437 bool warn)
438{
439 struct find_symbol_arg fsa;
440
441 fsa.name = name;
442 fsa.gplok = gplok;
443 fsa.warn = warn;
444
445 if (each_symbol_section(find_symbol_in_section, &fsa)) {
446 if (owner)
447 *owner = fsa.owner;
448 if (crc)
449 *crc = fsa.crc;
450 return fsa.sym;
451 }
452
453 pr_debug("Failed to find symbol %s\n", name);
454 return NULL;
455}
456EXPORT_SYMBOL_GPL(find_symbol);
457
458
459static struct module *find_module_all(const char *name, size_t len,
460 bool even_unformed)
461{
462 struct module *mod;
463
464 list_for_each_entry(mod, &modules, list) {
465 if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
466 continue;
467 if (strlen(mod->name) == len && !memcmp(mod->name, name, len))
468 return mod;
469 }
470 return NULL;
471}
472
473struct module *find_module(const char *name)
474{
475 return find_module_all(name, strlen(name), false);
476}
477EXPORT_SYMBOL_GPL(find_module);
478
479#ifdef CONFIG_SMP
480
481static inline void __percpu *mod_percpu(struct module *mod)
482{
483 return mod->percpu;
484}
485
486static int percpu_modalloc(struct module *mod, struct load_info *info)
487{
488 Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu];
489 unsigned long align = pcpusec->sh_addralign;
490
491 if (!pcpusec->sh_size)
492 return 0;
493
494 if (align > PAGE_SIZE) {
495 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
496 mod->name, align, PAGE_SIZE);
497 align = PAGE_SIZE;
498 }
499
500 mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align);
501 if (!mod->percpu) {
502 printk(KERN_WARNING
503 "%s: Could not allocate %lu bytes percpu data\n",
504 mod->name, (unsigned long)pcpusec->sh_size);
505 return -ENOMEM;
506 }
507 mod->percpu_size = pcpusec->sh_size;
508 return 0;
509}
510
511static void percpu_modfree(struct module *mod)
512{
513 free_percpu(mod->percpu);
514}
515
516static unsigned int find_pcpusec(struct load_info *info)
517{
518 return find_sec(info, ".data..percpu");
519}
520
521static void percpu_modcopy(struct module *mod,
522 const void *from, unsigned long size)
523{
524 int cpu;
525
526 for_each_possible_cpu(cpu)
527 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
528}
529
530
531
532
533
534
535
536
537
538
539bool is_module_percpu_address(unsigned long addr)
540{
541 struct module *mod;
542 unsigned int cpu;
543
544 preempt_disable();
545
546 list_for_each_entry_rcu(mod, &modules, list) {
547 if (mod->state == MODULE_STATE_UNFORMED)
548 continue;
549 if (!mod->percpu_size)
550 continue;
551 for_each_possible_cpu(cpu) {
552 void *start = per_cpu_ptr(mod->percpu, cpu);
553
554 if ((void *)addr >= start &&
555 (void *)addr < start + mod->percpu_size) {
556 preempt_enable();
557 return true;
558 }
559 }
560 }
561
562 preempt_enable();
563 return false;
564}
565
566#else
567
568static inline void __percpu *mod_percpu(struct module *mod)
569{
570 return NULL;
571}
572static int percpu_modalloc(struct module *mod, struct load_info *info)
573{
574
575 if (info->sechdrs[info->index.pcpu].sh_size != 0)
576 return -ENOMEM;
577 return 0;
578}
579static inline void percpu_modfree(struct module *mod)
580{
581}
582static unsigned int find_pcpusec(struct load_info *info)
583{
584 return 0;
585}
586static inline void percpu_modcopy(struct module *mod,
587 const void *from, unsigned long size)
588{
589
590 BUG_ON(size != 0);
591}
592bool is_module_percpu_address(unsigned long addr)
593{
594 return false;
595}
596
597#endif
598
599#define MODINFO_ATTR(field) \
600static void setup_modinfo_##field(struct module *mod, const char *s) \
601{ \
602 mod->field = kstrdup(s, GFP_KERNEL); \
603} \
604static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
605 struct module_kobject *mk, char *buffer) \
606{ \
607 return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
608} \
609static int modinfo_##field##_exists(struct module *mod) \
610{ \
611 return mod->field != NULL; \
612} \
613static void free_modinfo_##field(struct module *mod) \
614{ \
615 kfree(mod->field); \
616 mod->field = NULL; \
617} \
618static struct module_attribute modinfo_##field = { \
619 .attr = { .name = __stringify(field), .mode = 0444 }, \
620 .show = show_modinfo_##field, \
621 .setup = setup_modinfo_##field, \
622 .test = modinfo_##field##_exists, \
623 .free = free_modinfo_##field, \
624};
625
626MODINFO_ATTR(version);
627MODINFO_ATTR(srcversion);
628
629static char last_unloaded_module[MODULE_NAME_LEN+1];
630
631#ifdef CONFIG_MODULE_UNLOAD
632
633EXPORT_TRACEPOINT_SYMBOL(module_get);
634
635
636static int module_unload_init(struct module *mod)
637{
638 mod->refptr = alloc_percpu(struct module_ref);
639 if (!mod->refptr)
640 return -ENOMEM;
641
642 INIT_LIST_HEAD(&mod->source_list);
643 INIT_LIST_HEAD(&mod->target_list);
644
645
646 __this_cpu_write(mod->refptr->incs, 1);
647
648 mod->waiter = current;
649
650 return 0;
651}
652
653
654static int already_uses(struct module *a, struct module *b)
655{
656 struct module_use *use;
657
658 list_for_each_entry(use, &b->source_list, source_list) {
659 if (use->source == a) {
660 pr_debug("%s uses %s!\n", a->name, b->name);
661 return 1;
662 }
663 }
664 pr_debug("%s does not use %s!\n", a->name, b->name);
665 return 0;
666}
667
668
669
670
671
672
673
674
675static int add_module_usage(struct module *a, struct module *b)
676{
677 struct module_use *use;
678
679 pr_debug("Allocating new usage for %s.\n", a->name);
680 use = kmalloc(sizeof(*use), GFP_ATOMIC);
681 if (!use) {
682 printk(KERN_WARNING "%s: out of memory loading\n", a->name);
683 return -ENOMEM;
684 }
685
686 use->source = a;
687 use->target = b;
688 list_add(&use->source_list, &b->source_list);
689 list_add(&use->target_list, &a->target_list);
690 return 0;
691}
692
693
694int ref_module(struct module *a, struct module *b)
695{
696 int err;
697
698 if (b == NULL || already_uses(a, b))
699 return 0;
700
701
702 err = strong_try_module_get(b);
703 if (err)
704 return err;
705
706 err = add_module_usage(a, b);
707 if (err) {
708 module_put(b);
709 return err;
710 }
711 return 0;
712}
713EXPORT_SYMBOL_GPL(ref_module);
714
715
716static void module_unload_free(struct module *mod)
717{
718 struct module_use *use, *tmp;
719
720 mutex_lock(&module_mutex);
721 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
722 struct module *i = use->target;
723 pr_debug("%s unusing %s\n", mod->name, i->name);
724 module_put(i);
725 list_del(&use->source_list);
726 list_del(&use->target_list);
727 kfree(use);
728 }
729 mutex_unlock(&module_mutex);
730
731 free_percpu(mod->refptr);
732}
733
734#ifdef CONFIG_MODULE_FORCE_UNLOAD
735static inline int try_force_unload(unsigned int flags)
736{
737 int ret = (flags & O_TRUNC);
738 if (ret)
739 add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE);
740 return ret;
741}
742#else
743static inline int try_force_unload(unsigned int flags)
744{
745 return 0;
746}
747#endif
748
749struct stopref
750{
751 struct module *mod;
752 int flags;
753 int *forced;
754};
755
756
757static int __try_stop_module(void *_sref)
758{
759 struct stopref *sref = _sref;
760
761
762 if (module_refcount(sref->mod) != 0) {
763 if (!(*sref->forced = try_force_unload(sref->flags)))
764 return -EWOULDBLOCK;
765 }
766
767
768 sref->mod->state = MODULE_STATE_GOING;
769 return 0;
770}
771
772static int try_stop_module(struct module *mod, int flags, int *forced)
773{
774 if (flags & O_NONBLOCK) {
775 struct stopref sref = { mod, flags, forced };
776
777 return stop_machine(__try_stop_module, &sref, NULL);
778 } else {
779
780 mod->state = MODULE_STATE_GOING;
781 synchronize_sched();
782 return 0;
783 }
784}
785
786unsigned long module_refcount(struct module *mod)
787{
788 unsigned long incs = 0, decs = 0;
789 int cpu;
790
791 for_each_possible_cpu(cpu)
792 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
793
794
795
796
797
798
799
800
801
802
803
804
805
806 smp_rmb();
807 for_each_possible_cpu(cpu)
808 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
809 return incs - decs;
810}
811EXPORT_SYMBOL(module_refcount);
812
813
814static void free_module(struct module *mod);
815
816static void wait_for_zero_refcount(struct module *mod)
817{
818
819 mutex_unlock(&module_mutex);
820 for (;;) {
821 pr_debug("Looking at refcount...\n");
822 set_current_state(TASK_UNINTERRUPTIBLE);
823 if (module_refcount(mod) == 0)
824 break;
825 schedule();
826 }
827 current->state = TASK_RUNNING;
828 mutex_lock(&module_mutex);
829}
830
831SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
832 unsigned int, flags)
833{
834 struct module *mod;
835 char name[MODULE_NAME_LEN];
836 int ret, forced = 0;
837
838 if (!capable(CAP_SYS_MODULE) || modules_disabled)
839 return -EPERM;
840
841 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
842 return -EFAULT;
843 name[MODULE_NAME_LEN-1] = '\0';
844
845 if (mutex_lock_interruptible(&module_mutex) != 0)
846 return -EINTR;
847
848 mod = find_module(name);
849 if (!mod) {
850 ret = -ENOENT;
851 goto out;
852 }
853
854 if (!list_empty(&mod->source_list)) {
855
856 ret = -EWOULDBLOCK;
857 goto out;
858 }
859
860
861 if (mod->state != MODULE_STATE_LIVE) {
862
863
864 pr_debug("%s already dying\n", mod->name);
865 ret = -EBUSY;
866 goto out;
867 }
868
869
870 if (mod->init && !mod->exit) {
871 forced = try_force_unload(flags);
872 if (!forced) {
873
874 ret = -EBUSY;
875 goto out;
876 }
877 }
878
879
880 mod->waiter = current;
881
882
883 ret = try_stop_module(mod, flags, &forced);
884 if (ret != 0)
885 goto out;
886
887
888 if (!forced && module_refcount(mod) != 0)
889 wait_for_zero_refcount(mod);
890
891 mutex_unlock(&module_mutex);
892
893 if (mod->exit != NULL)
894 mod->exit();
895 blocking_notifier_call_chain(&module_notify_list,
896 MODULE_STATE_GOING, mod);
897 async_synchronize_full();
898
899
900 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
901
902 free_module(mod);
903 return 0;
904out:
905 mutex_unlock(&module_mutex);
906 return ret;
907}
908
909static inline void print_unload_info(struct seq_file *m, struct module *mod)
910{
911 struct module_use *use;
912 int printed_something = 0;
913
914 seq_printf(m, " %lu ", module_refcount(mod));
915
916
917
918 list_for_each_entry(use, &mod->source_list, source_list) {
919 printed_something = 1;
920 seq_printf(m, "%s,", use->source->name);
921 }
922
923 if (mod->init != NULL && mod->exit == NULL) {
924 printed_something = 1;
925 seq_printf(m, "[permanent],");
926 }
927
928 if (!printed_something)
929 seq_printf(m, "-");
930}
931
932void __symbol_put(const char *symbol)
933{
934 struct module *owner;
935
936 preempt_disable();
937 if (!find_symbol(symbol, &owner, NULL, true, false))
938 BUG();
939 module_put(owner);
940 preempt_enable();
941}
942EXPORT_SYMBOL(__symbol_put);
943
944
945void symbol_put_addr(void *addr)
946{
947 struct module *modaddr;
948 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
949
950 if (core_kernel_text(a))
951 return;
952
953
954
955 modaddr = __module_text_address(a);
956 BUG_ON(!modaddr);
957 module_put(modaddr);
958}
959EXPORT_SYMBOL_GPL(symbol_put_addr);
960
961static ssize_t show_refcnt(struct module_attribute *mattr,
962 struct module_kobject *mk, char *buffer)
963{
964 return sprintf(buffer, "%lu\n", module_refcount(mk->mod));
965}
966
967static struct module_attribute modinfo_refcnt =
968 __ATTR(refcnt, 0444, show_refcnt, NULL);
969
970void __module_get(struct module *module)
971{
972 if (module) {
973 preempt_disable();
974 __this_cpu_inc(module->refptr->incs);
975 trace_module_get(module, _RET_IP_);
976 preempt_enable();
977 }
978}
979EXPORT_SYMBOL(__module_get);
980
981bool try_module_get(struct module *module)
982{
983 bool ret = true;
984
985 if (module) {
986 preempt_disable();
987
988 if (likely(module_is_live(module))) {
989 __this_cpu_inc(module->refptr->incs);
990 trace_module_get(module, _RET_IP_);
991 } else
992 ret = false;
993
994 preempt_enable();
995 }
996 return ret;
997}
998EXPORT_SYMBOL(try_module_get);
999
1000void module_put(struct module *module)
1001{
1002 if (module) {
1003 preempt_disable();
1004 smp_wmb();
1005 __this_cpu_inc(module->refptr->decs);
1006
1007 trace_module_put(module, _RET_IP_);
1008
1009 if (unlikely(!module_is_live(module)))
1010 wake_up_process(module->waiter);
1011 preempt_enable();
1012 }
1013}
1014EXPORT_SYMBOL(module_put);
1015
1016#else
1017static inline void print_unload_info(struct seq_file *m, struct module *mod)
1018{
1019
1020 seq_printf(m, " - -");
1021}
1022
1023static inline void module_unload_free(struct module *mod)
1024{
1025}
1026
1027int ref_module(struct module *a, struct module *b)
1028{
1029 return strong_try_module_get(b);
1030}
1031EXPORT_SYMBOL_GPL(ref_module);
1032
1033static inline int module_unload_init(struct module *mod)
1034{
1035 return 0;
1036}
1037#endif
1038
1039static size_t module_flags_taint(struct module *mod, char *buf)
1040{
1041 size_t l = 0;
1042
1043 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
1044 buf[l++] = 'P';
1045 if (mod->taints & (1 << TAINT_OOT_MODULE))
1046 buf[l++] = 'O';
1047 if (mod->taints & (1 << TAINT_FORCED_MODULE))
1048 buf[l++] = 'F';
1049 if (mod->taints & (1 << TAINT_CRAP))
1050 buf[l++] = 'C';
1051
1052
1053
1054
1055
1056 return l;
1057}
1058
1059static ssize_t show_initstate(struct module_attribute *mattr,
1060 struct module_kobject *mk, char *buffer)
1061{
1062 const char *state = "unknown";
1063
1064 switch (mk->mod->state) {
1065 case MODULE_STATE_LIVE:
1066 state = "live";
1067 break;
1068 case MODULE_STATE_COMING:
1069 state = "coming";
1070 break;
1071 case MODULE_STATE_GOING:
1072 state = "going";
1073 break;
1074 default:
1075 BUG();
1076 }
1077 return sprintf(buffer, "%s\n", state);
1078}
1079
1080static struct module_attribute modinfo_initstate =
1081 __ATTR(initstate, 0444, show_initstate, NULL);
1082
1083static ssize_t store_uevent(struct module_attribute *mattr,
1084 struct module_kobject *mk,
1085 const char *buffer, size_t count)
1086{
1087 enum kobject_action action;
1088
1089 if (kobject_action_type(buffer, count, &action) == 0)
1090 kobject_uevent(&mk->kobj, action);
1091 return count;
1092}
1093
1094struct module_attribute module_uevent =
1095 __ATTR(uevent, 0200, NULL, store_uevent);
1096
1097static ssize_t show_coresize(struct module_attribute *mattr,
1098 struct module_kobject *mk, char *buffer)
1099{
1100 return sprintf(buffer, "%u\n", mk->mod->core_size);
1101}
1102
1103static struct module_attribute modinfo_coresize =
1104 __ATTR(coresize, 0444, show_coresize, NULL);
1105
1106static ssize_t show_initsize(struct module_attribute *mattr,
1107 struct module_kobject *mk, char *buffer)
1108{
1109 return sprintf(buffer, "%u\n", mk->mod->init_size);
1110}
1111
1112static struct module_attribute modinfo_initsize =
1113 __ATTR(initsize, 0444, show_initsize, NULL);
1114
1115static ssize_t show_taint(struct module_attribute *mattr,
1116 struct module_kobject *mk, char *buffer)
1117{
1118 size_t l;
1119
1120 l = module_flags_taint(mk->mod, buffer);
1121 buffer[l++] = '\n';
1122 return l;
1123}
1124
1125static struct module_attribute modinfo_taint =
1126 __ATTR(taint, 0444, show_taint, NULL);
1127
1128static struct module_attribute *modinfo_attrs[] = {
1129 &module_uevent,
1130 &modinfo_version,
1131 &modinfo_srcversion,
1132 &modinfo_initstate,
1133 &modinfo_coresize,
1134 &modinfo_initsize,
1135 &modinfo_taint,
1136#ifdef CONFIG_MODULE_UNLOAD
1137 &modinfo_refcnt,
1138#endif
1139 NULL,
1140};
1141
1142static const char vermagic[] = VERMAGIC_STRING;
1143
1144static int try_to_force_load(struct module *mod, const char *reason)
1145{
1146#ifdef CONFIG_MODULE_FORCE_LOAD
1147 if (!test_taint(TAINT_FORCED_MODULE))
1148 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
1149 mod->name, reason);
1150 add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE);
1151 return 0;
1152#else
1153 return -ENOEXEC;
1154#endif
1155}
1156
1157#ifdef CONFIG_MODVERSIONS
1158
1159static unsigned long maybe_relocated(unsigned long crc,
1160 const struct module *crc_owner)
1161{
1162#ifdef ARCH_RELOCATES_KCRCTAB
1163 if (crc_owner == NULL)
1164 return crc - (unsigned long)reloc_start;
1165#endif
1166 return crc;
1167}
1168
1169static int check_version(Elf_Shdr *sechdrs,
1170 unsigned int versindex,
1171 const char *symname,
1172 struct module *mod,
1173 const unsigned long *crc,
1174 const struct module *crc_owner)
1175{
1176 unsigned int i, num_versions;
1177 struct modversion_info *versions;
1178
1179
1180 if (!crc)
1181 return 1;
1182
1183
1184 if (versindex == 0)
1185 return try_to_force_load(mod, symname) == 0;
1186
1187 versions = (void *) sechdrs[versindex].sh_addr;
1188 num_versions = sechdrs[versindex].sh_size
1189 / sizeof(struct modversion_info);
1190
1191 for (i = 0; i < num_versions; i++) {
1192 if (strcmp(versions[i].name, symname) != 0)
1193 continue;
1194
1195 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
1196 return 1;
1197 pr_debug("Found checksum %lX vs module %lX\n",
1198 maybe_relocated(*crc, crc_owner), versions[i].crc);
1199 goto bad_version;
1200 }
1201
1202 printk(KERN_WARNING "%s: no symbol version for %s\n",
1203 mod->name, symname);
1204 return 0;
1205
1206bad_version:
1207 printk("%s: disagrees about version of symbol %s\n",
1208 mod->name, symname);
1209 return 0;
1210}
1211
1212static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1213 unsigned int versindex,
1214 struct module *mod)
1215{
1216 const unsigned long *crc;
1217
1218
1219
1220 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL,
1221 &crc, true, false))
1222 BUG();
1223 return check_version(sechdrs, versindex,
1224 VMLINUX_SYMBOL_STR(module_layout), mod, crc,
1225 NULL);
1226}
1227
1228
1229static inline int same_magic(const char *amagic, const char *bmagic,
1230 bool has_crcs)
1231{
1232 if (has_crcs) {
1233 amagic += strcspn(amagic, " ");
1234 bmagic += strcspn(bmagic, " ");
1235 }
1236 return strcmp(amagic, bmagic) == 0;
1237}
1238#else
1239static inline int check_version(Elf_Shdr *sechdrs,
1240 unsigned int versindex,
1241 const char *symname,
1242 struct module *mod,
1243 const unsigned long *crc,
1244 const struct module *crc_owner)
1245{
1246 return 1;
1247}
1248
1249static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1250 unsigned int versindex,
1251 struct module *mod)
1252{
1253 return 1;
1254}
1255
1256static inline int same_magic(const char *amagic, const char *bmagic,
1257 bool has_crcs)
1258{
1259 return strcmp(amagic, bmagic) == 0;
1260}
1261#endif
1262
1263
1264static const struct kernel_symbol *resolve_symbol(struct module *mod,
1265 const struct load_info *info,
1266 const char *name,
1267 char ownername[])
1268{
1269 struct module *owner;
1270 const struct kernel_symbol *sym;
1271 const unsigned long *crc;
1272 int err;
1273
1274 mutex_lock(&module_mutex);
1275 sym = find_symbol(name, &owner, &crc,
1276 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1277 if (!sym)
1278 goto unlock;
1279
1280 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1281 owner)) {
1282 sym = ERR_PTR(-EINVAL);
1283 goto getname;
1284 }
1285
1286 err = ref_module(mod, owner);
1287 if (err) {
1288 sym = ERR_PTR(err);
1289 goto getname;
1290 }
1291
1292getname:
1293
1294 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1295unlock:
1296 mutex_unlock(&module_mutex);
1297 return sym;
1298}
1299
1300static const struct kernel_symbol *
1301resolve_symbol_wait(struct module *mod,
1302 const struct load_info *info,
1303 const char *name)
1304{
1305 const struct kernel_symbol *ksym;
1306 char owner[MODULE_NAME_LEN];
1307
1308 if (wait_event_interruptible_timeout(module_wq,
1309 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1310 || PTR_ERR(ksym) != -EBUSY,
1311 30 * HZ) <= 0) {
1312 printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
1313 mod->name, owner);
1314 }
1315 return ksym;
1316}
1317
1318
1319
1320
1321
1322#ifdef CONFIG_SYSFS
1323
1324#ifdef CONFIG_KALLSYMS
1325static inline bool sect_empty(const Elf_Shdr *sect)
1326{
1327 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1328}
1329
1330struct module_sect_attr
1331{
1332 struct module_attribute mattr;
1333 char *name;
1334 unsigned long address;
1335};
1336
1337struct module_sect_attrs
1338{
1339 struct attribute_group grp;
1340 unsigned int nsections;
1341 struct module_sect_attr attrs[0];
1342};
1343
1344static ssize_t module_sect_show(struct module_attribute *mattr,
1345 struct module_kobject *mk, char *buf)
1346{
1347 struct module_sect_attr *sattr =
1348 container_of(mattr, struct module_sect_attr, mattr);
1349 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
1350}
1351
1352static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1353{
1354 unsigned int section;
1355
1356 for (section = 0; section < sect_attrs->nsections; section++)
1357 kfree(sect_attrs->attrs[section].name);
1358 kfree(sect_attrs);
1359}
1360
1361static void add_sect_attrs(struct module *mod, const struct load_info *info)
1362{
1363 unsigned int nloaded = 0, i, size[2];
1364 struct module_sect_attrs *sect_attrs;
1365 struct module_sect_attr *sattr;
1366 struct attribute **gattr;
1367
1368
1369 for (i = 0; i < info->hdr->e_shnum; i++)
1370 if (!sect_empty(&info->sechdrs[i]))
1371 nloaded++;
1372 size[0] = ALIGN(sizeof(*sect_attrs)
1373 + nloaded * sizeof(sect_attrs->attrs[0]),
1374 sizeof(sect_attrs->grp.attrs[0]));
1375 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1376 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1377 if (sect_attrs == NULL)
1378 return;
1379
1380
1381 sect_attrs->grp.name = "sections";
1382 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1383
1384 sect_attrs->nsections = 0;
1385 sattr = §_attrs->attrs[0];
1386 gattr = §_attrs->grp.attrs[0];
1387 for (i = 0; i < info->hdr->e_shnum; i++) {
1388 Elf_Shdr *sec = &info->sechdrs[i];
1389 if (sect_empty(sec))
1390 continue;
1391 sattr->address = sec->sh_addr;
1392 sattr->name = kstrdup(info->secstrings + sec->sh_name,
1393 GFP_KERNEL);
1394 if (sattr->name == NULL)
1395 goto out;
1396 sect_attrs->nsections++;
1397 sysfs_attr_init(&sattr->mattr.attr);
1398 sattr->mattr.show = module_sect_show;
1399 sattr->mattr.store = NULL;
1400 sattr->mattr.attr.name = sattr->name;
1401 sattr->mattr.attr.mode = S_IRUGO;
1402 *(gattr++) = &(sattr++)->mattr.attr;
1403 }
1404 *gattr = NULL;
1405
1406 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1407 goto out;
1408
1409 mod->sect_attrs = sect_attrs;
1410 return;
1411 out:
1412 free_sect_attrs(sect_attrs);
1413}
1414
1415static void remove_sect_attrs(struct module *mod)
1416{
1417 if (mod->sect_attrs) {
1418 sysfs_remove_group(&mod->mkobj.kobj,
1419 &mod->sect_attrs->grp);
1420
1421
1422 free_sect_attrs(mod->sect_attrs);
1423 mod->sect_attrs = NULL;
1424 }
1425}
1426
1427
1428
1429
1430
1431struct module_notes_attrs {
1432 struct kobject *dir;
1433 unsigned int notes;
1434 struct bin_attribute attrs[0];
1435};
1436
1437static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
1438 struct bin_attribute *bin_attr,
1439 char *buf, loff_t pos, size_t count)
1440{
1441
1442
1443
1444 memcpy(buf, bin_attr->private + pos, count);
1445 return count;
1446}
1447
1448static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1449 unsigned int i)
1450{
1451 if (notes_attrs->dir) {
1452 while (i-- > 0)
1453 sysfs_remove_bin_file(notes_attrs->dir,
1454 ¬es_attrs->attrs[i]);
1455 kobject_put(notes_attrs->dir);
1456 }
1457 kfree(notes_attrs);
1458}
1459
1460static void add_notes_attrs(struct module *mod, const struct load_info *info)
1461{
1462 unsigned int notes, loaded, i;
1463 struct module_notes_attrs *notes_attrs;
1464 struct bin_attribute *nattr;
1465
1466
1467 if (!mod->sect_attrs)
1468 return;
1469
1470
1471 notes = 0;
1472 for (i = 0; i < info->hdr->e_shnum; i++)
1473 if (!sect_empty(&info->sechdrs[i]) &&
1474 (info->sechdrs[i].sh_type == SHT_NOTE))
1475 ++notes;
1476
1477 if (notes == 0)
1478 return;
1479
1480 notes_attrs = kzalloc(sizeof(*notes_attrs)
1481 + notes * sizeof(notes_attrs->attrs[0]),
1482 GFP_KERNEL);
1483 if (notes_attrs == NULL)
1484 return;
1485
1486 notes_attrs->notes = notes;
1487 nattr = ¬es_attrs->attrs[0];
1488 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1489 if (sect_empty(&info->sechdrs[i]))
1490 continue;
1491 if (info->sechdrs[i].sh_type == SHT_NOTE) {
1492 sysfs_bin_attr_init(nattr);
1493 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1494 nattr->attr.mode = S_IRUGO;
1495 nattr->size = info->sechdrs[i].sh_size;
1496 nattr->private = (void *) info->sechdrs[i].sh_addr;
1497 nattr->read = module_notes_read;
1498 ++nattr;
1499 }
1500 ++loaded;
1501 }
1502
1503 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1504 if (!notes_attrs->dir)
1505 goto out;
1506
1507 for (i = 0; i < notes; ++i)
1508 if (sysfs_create_bin_file(notes_attrs->dir,
1509 ¬es_attrs->attrs[i]))
1510 goto out;
1511
1512 mod->notes_attrs = notes_attrs;
1513 return;
1514
1515 out:
1516 free_notes_attrs(notes_attrs, i);
1517}
1518
1519static void remove_notes_attrs(struct module *mod)
1520{
1521 if (mod->notes_attrs)
1522 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1523}
1524
1525#else
1526
1527static inline void add_sect_attrs(struct module *mod,
1528 const struct load_info *info)
1529{
1530}
1531
1532static inline void remove_sect_attrs(struct module *mod)
1533{
1534}
1535
1536static inline void add_notes_attrs(struct module *mod,
1537 const struct load_info *info)
1538{
1539}
1540
1541static inline void remove_notes_attrs(struct module *mod)
1542{
1543}
1544#endif
1545
1546static void add_usage_links(struct module *mod)
1547{
1548#ifdef CONFIG_MODULE_UNLOAD
1549 struct module_use *use;
1550 int nowarn;
1551
1552 mutex_lock(&module_mutex);
1553 list_for_each_entry(use, &mod->target_list, target_list) {
1554 nowarn = sysfs_create_link(use->target->holders_dir,
1555 &mod->mkobj.kobj, mod->name);
1556 }
1557 mutex_unlock(&module_mutex);
1558#endif
1559}
1560
1561static void del_usage_links(struct module *mod)
1562{
1563#ifdef CONFIG_MODULE_UNLOAD
1564 struct module_use *use;
1565
1566 mutex_lock(&module_mutex);
1567 list_for_each_entry(use, &mod->target_list, target_list)
1568 sysfs_remove_link(use->target->holders_dir, mod->name);
1569 mutex_unlock(&module_mutex);
1570#endif
1571}
1572
1573static int module_add_modinfo_attrs(struct module *mod)
1574{
1575 struct module_attribute *attr;
1576 struct module_attribute *temp_attr;
1577 int error = 0;
1578 int i;
1579
1580 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1581 (ARRAY_SIZE(modinfo_attrs) + 1)),
1582 GFP_KERNEL);
1583 if (!mod->modinfo_attrs)
1584 return -ENOMEM;
1585
1586 temp_attr = mod->modinfo_attrs;
1587 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1588 if (!attr->test ||
1589 (attr->test && attr->test(mod))) {
1590 memcpy(temp_attr, attr, sizeof(*temp_attr));
1591 sysfs_attr_init(&temp_attr->attr);
1592 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1593 ++temp_attr;
1594 }
1595 }
1596 return error;
1597}
1598
1599static void module_remove_modinfo_attrs(struct module *mod)
1600{
1601 struct module_attribute *attr;
1602 int i;
1603
1604 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1605
1606 if (!attr->attr.name)
1607 break;
1608 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1609 if (attr->free)
1610 attr->free(mod);
1611 }
1612 kfree(mod->modinfo_attrs);
1613}
1614
1615static void mod_kobject_put(struct module *mod)
1616{
1617 DECLARE_COMPLETION_ONSTACK(c);
1618 mod->mkobj.kobj_completion = &c;
1619 kobject_put(&mod->mkobj.kobj);
1620 wait_for_completion(&c);
1621}
1622
1623static int mod_sysfs_init(struct module *mod)
1624{
1625 int err;
1626 struct kobject *kobj;
1627
1628 if (!module_sysfs_initialized) {
1629 printk(KERN_ERR "%s: module sysfs not initialized\n",
1630 mod->name);
1631 err = -EINVAL;
1632 goto out;
1633 }
1634
1635 kobj = kset_find_obj(module_kset, mod->name);
1636 if (kobj) {
1637 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1638 kobject_put(kobj);
1639 err = -EINVAL;
1640 goto out;
1641 }
1642
1643 mod->mkobj.mod = mod;
1644
1645 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1646 mod->mkobj.kobj.kset = module_kset;
1647 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1648 "%s", mod->name);
1649 if (err)
1650 mod_kobject_put(mod);
1651
1652
1653out:
1654 return err;
1655}
1656
1657static int mod_sysfs_setup(struct module *mod,
1658 const struct load_info *info,
1659 struct kernel_param *kparam,
1660 unsigned int num_params)
1661{
1662 int err;
1663
1664 err = mod_sysfs_init(mod);
1665 if (err)
1666 goto out;
1667
1668 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1669 if (!mod->holders_dir) {
1670 err = -ENOMEM;
1671 goto out_unreg;
1672 }
1673
1674 err = module_param_sysfs_setup(mod, kparam, num_params);
1675 if (err)
1676 goto out_unreg_holders;
1677
1678 err = module_add_modinfo_attrs(mod);
1679 if (err)
1680 goto out_unreg_param;
1681
1682 add_usage_links(mod);
1683 add_sect_attrs(mod, info);
1684 add_notes_attrs(mod, info);
1685
1686 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1687 return 0;
1688
1689out_unreg_param:
1690 module_param_sysfs_remove(mod);
1691out_unreg_holders:
1692 kobject_put(mod->holders_dir);
1693out_unreg:
1694 mod_kobject_put(mod);
1695out:
1696 return err;
1697}
1698
1699static void mod_sysfs_fini(struct module *mod)
1700{
1701 remove_notes_attrs(mod);
1702 remove_sect_attrs(mod);
1703 mod_kobject_put(mod);
1704}
1705
1706#else
1707
1708static int mod_sysfs_setup(struct module *mod,
1709 const struct load_info *info,
1710 struct kernel_param *kparam,
1711 unsigned int num_params)
1712{
1713 return 0;
1714}
1715
1716static void mod_sysfs_fini(struct module *mod)
1717{
1718}
1719
1720static void module_remove_modinfo_attrs(struct module *mod)
1721{
1722}
1723
1724static void del_usage_links(struct module *mod)
1725{
1726}
1727
1728#endif
1729
1730static void mod_sysfs_teardown(struct module *mod)
1731{
1732 del_usage_links(mod);
1733 module_remove_modinfo_attrs(mod);
1734 module_param_sysfs_remove(mod);
1735 kobject_put(mod->mkobj.drivers_dir);
1736 kobject_put(mod->holders_dir);
1737 mod_sysfs_fini(mod);
1738}
1739
1740
1741
1742
1743
1744static int __unlink_module(void *_mod)
1745{
1746 struct module *mod = _mod;
1747 list_del(&mod->list);
1748 module_bug_cleanup(mod);
1749 return 0;
1750}
1751
1752#ifdef CONFIG_DEBUG_SET_MODULE_RONX
1753
1754
1755
1756
1757void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages))
1758{
1759 unsigned long begin_pfn = PFN_DOWN((unsigned long)start);
1760 unsigned long end_pfn = PFN_DOWN((unsigned long)end);
1761
1762 if (end_pfn > begin_pfn)
1763 set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1764}
1765
1766static void set_section_ro_nx(void *base,
1767 unsigned long text_size,
1768 unsigned long ro_size,
1769 unsigned long total_size)
1770{
1771
1772 unsigned long begin_pfn;
1773 unsigned long end_pfn;
1774
1775
1776
1777
1778
1779
1780 if (ro_size > 0)
1781 set_page_attributes(base, base + ro_size, set_memory_ro);
1782
1783
1784
1785
1786
1787
1788 if (total_size > text_size) {
1789 begin_pfn = PFN_UP((unsigned long)base + text_size);
1790 end_pfn = PFN_UP((unsigned long)base + total_size);
1791 if (end_pfn > begin_pfn)
1792 set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1793 }
1794}
1795
1796static void unset_module_core_ro_nx(struct module *mod)
1797{
1798 set_page_attributes(mod->module_core + mod->core_text_size,
1799 mod->module_core + mod->core_size,
1800 set_memory_x);
1801 set_page_attributes(mod->module_core,
1802 mod->module_core + mod->core_ro_size,
1803 set_memory_rw);
1804}
1805
1806static void unset_module_init_ro_nx(struct module *mod)
1807{
1808 set_page_attributes(mod->module_init + mod->init_text_size,
1809 mod->module_init + mod->init_size,
1810 set_memory_x);
1811 set_page_attributes(mod->module_init,
1812 mod->module_init + mod->init_ro_size,
1813 set_memory_rw);
1814}
1815
1816
1817void set_all_modules_text_rw(void)
1818{
1819 struct module *mod;
1820
1821 mutex_lock(&module_mutex);
1822 list_for_each_entry_rcu(mod, &modules, list) {
1823 if (mod->state == MODULE_STATE_UNFORMED)
1824 continue;
1825 if ((mod->module_core) && (mod->core_text_size)) {
1826 set_page_attributes(mod->module_core,
1827 mod->module_core + mod->core_text_size,
1828 set_memory_rw);
1829 }
1830 if ((mod->module_init) && (mod->init_text_size)) {
1831 set_page_attributes(mod->module_init,
1832 mod->module_init + mod->init_text_size,
1833 set_memory_rw);
1834 }
1835 }
1836 mutex_unlock(&module_mutex);
1837}
1838
1839
1840void set_all_modules_text_ro(void)
1841{
1842 struct module *mod;
1843
1844 mutex_lock(&module_mutex);
1845 list_for_each_entry_rcu(mod, &modules, list) {
1846 if (mod->state == MODULE_STATE_UNFORMED)
1847 continue;
1848 if ((mod->module_core) && (mod->core_text_size)) {
1849 set_page_attributes(mod->module_core,
1850 mod->module_core + mod->core_text_size,
1851 set_memory_ro);
1852 }
1853 if ((mod->module_init) && (mod->init_text_size)) {
1854 set_page_attributes(mod->module_init,
1855 mod->module_init + mod->init_text_size,
1856 set_memory_ro);
1857 }
1858 }
1859 mutex_unlock(&module_mutex);
1860}
1861#else
1862static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
1863static void unset_module_core_ro_nx(struct module *mod) { }
1864static void unset_module_init_ro_nx(struct module *mod) { }
1865#endif
1866
1867void __weak module_free(struct module *mod, void *module_region)
1868{
1869 vfree(module_region);
1870}
1871
1872void __weak module_arch_cleanup(struct module *mod)
1873{
1874}
1875
1876
1877static void free_module(struct module *mod)
1878{
1879 trace_module_free(mod);
1880
1881 mod_sysfs_teardown(mod);
1882
1883
1884
1885 mod->state = MODULE_STATE_UNFORMED;
1886
1887
1888 ddebug_remove_module(mod->name);
1889
1890
1891 module_arch_cleanup(mod);
1892
1893
1894 module_unload_free(mod);
1895
1896
1897 destroy_params(mod->kp, mod->num_kp);
1898
1899
1900 mutex_lock(&module_mutex);
1901 stop_machine(__unlink_module, mod, NULL);
1902 mutex_unlock(&module_mutex);
1903
1904
1905 unset_module_init_ro_nx(mod);
1906 module_free(mod, mod->module_init);
1907 kfree(mod->args);
1908 percpu_modfree(mod);
1909
1910
1911 lockdep_free_key_range(mod->module_core, mod->core_size);
1912
1913
1914 unset_module_core_ro_nx(mod);
1915 module_free(mod, mod->module_core);
1916
1917#ifdef CONFIG_MPU
1918 update_protections(current->mm);
1919#endif
1920}
1921
1922void *__symbol_get(const char *symbol)
1923{
1924 struct module *owner;
1925 const struct kernel_symbol *sym;
1926
1927 preempt_disable();
1928 sym = find_symbol(symbol, &owner, NULL, true, true);
1929 if (sym && strong_try_module_get(owner))
1930 sym = NULL;
1931 preempt_enable();
1932
1933 return sym ? (void *)sym->value : NULL;
1934}
1935EXPORT_SYMBOL_GPL(__symbol_get);
1936
1937
1938
1939
1940
1941
1942
1943static int verify_export_symbols(struct module *mod)
1944{
1945 unsigned int i;
1946 struct module *owner;
1947 const struct kernel_symbol *s;
1948 struct {
1949 const struct kernel_symbol *sym;
1950 unsigned int num;
1951 } arr[] = {
1952 { mod->syms, mod->num_syms },
1953 { mod->gpl_syms, mod->num_gpl_syms },
1954 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1955#ifdef CONFIG_UNUSED_SYMBOLS
1956 { mod->unused_syms, mod->num_unused_syms },
1957 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1958#endif
1959 };
1960
1961 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1962 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1963 if (find_symbol(s->name, &owner, NULL, true, false)) {
1964 printk(KERN_ERR
1965 "%s: exports duplicate symbol %s"
1966 " (owned by %s)\n",
1967 mod->name, s->name, module_name(owner));
1968 return -ENOEXEC;
1969 }
1970 }
1971 }
1972 return 0;
1973}
1974
1975
1976static int simplify_symbols(struct module *mod, const struct load_info *info)
1977{
1978 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1979 Elf_Sym *sym = (void *)symsec->sh_addr;
1980 unsigned long secbase;
1981 unsigned int i;
1982 int ret = 0;
1983 const struct kernel_symbol *ksym;
1984
1985 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1986 const char *name = info->strtab + sym[i].st_name;
1987
1988 switch (sym[i].st_shndx) {
1989 case SHN_COMMON:
1990
1991
1992 pr_debug("Common symbol: %s\n", name);
1993 printk("%s: please compile with -fno-common\n",
1994 mod->name);
1995 ret = -ENOEXEC;
1996 break;
1997
1998 case SHN_ABS:
1999
2000 pr_debug("Absolute symbol: 0x%08lx\n",
2001 (long)sym[i].st_value);
2002 break;
2003
2004 case SHN_UNDEF:
2005 ksym = resolve_symbol_wait(mod, info, name);
2006
2007 if (ksym && !IS_ERR(ksym)) {
2008 sym[i].st_value = ksym->value;
2009 break;
2010 }
2011
2012
2013 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
2014 break;
2015
2016 printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
2017 mod->name, name, PTR_ERR(ksym));
2018 ret = PTR_ERR(ksym) ?: -ENOENT;
2019 break;
2020
2021 default:
2022
2023 if (sym[i].st_shndx == info->index.pcpu)
2024 secbase = (unsigned long)mod_percpu(mod);
2025 else
2026 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
2027 sym[i].st_value += secbase;
2028 break;
2029 }
2030 }
2031
2032 return ret;
2033}
2034
2035static int apply_relocations(struct module *mod, const struct load_info *info)
2036{
2037 unsigned int i;
2038 int err = 0;
2039
2040
2041 for (i = 1; i < info->hdr->e_shnum; i++) {
2042 unsigned int infosec = info->sechdrs[i].sh_info;
2043
2044
2045 if (infosec >= info->hdr->e_shnum)
2046 continue;
2047
2048
2049 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
2050 continue;
2051
2052 if (info->sechdrs[i].sh_type == SHT_REL)
2053 err = apply_relocate(info->sechdrs, info->strtab,
2054 info->index.sym, i, mod);
2055 else if (info->sechdrs[i].sh_type == SHT_RELA)
2056 err = apply_relocate_add(info->sechdrs, info->strtab,
2057 info->index.sym, i, mod);
2058 if (err < 0)
2059 break;
2060 }
2061 return err;
2062}
2063
2064
2065unsigned int __weak arch_mod_section_prepend(struct module *mod,
2066 unsigned int section)
2067{
2068
2069 return 0;
2070}
2071
2072
2073static long get_offset(struct module *mod, unsigned int *size,
2074 Elf_Shdr *sechdr, unsigned int section)
2075{
2076 long ret;
2077
2078 *size += arch_mod_section_prepend(mod, section);
2079 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
2080 *size = ret + sechdr->sh_size;
2081 return ret;
2082}
2083
2084
2085
2086
2087
2088static void layout_sections(struct module *mod, struct load_info *info)
2089{
2090 static unsigned long const masks[][2] = {
2091
2092
2093
2094 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
2095 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
2096 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
2097 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
2098 };
2099 unsigned int m, i;
2100
2101 for (i = 0; i < info->hdr->e_shnum; i++)
2102 info->sechdrs[i].sh_entsize = ~0UL;
2103
2104 pr_debug("Core section allocation order:\n");
2105 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2106 for (i = 0; i < info->hdr->e_shnum; ++i) {
2107 Elf_Shdr *s = &info->sechdrs[i];
2108 const char *sname = info->secstrings + s->sh_name;
2109
2110 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2111 || (s->sh_flags & masks[m][1])
2112 || s->sh_entsize != ~0UL
2113 || strstarts(sname, ".init"))
2114 continue;
2115 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
2116 pr_debug("\t%s\n", sname);
2117 }
2118 switch (m) {
2119 case 0:
2120 mod->core_size = debug_align(mod->core_size);
2121 mod->core_text_size = mod->core_size;
2122 break;
2123 case 1:
2124 mod->core_size = debug_align(mod->core_size);
2125 mod->core_ro_size = mod->core_size;
2126 break;
2127 case 3:
2128 mod->core_size = debug_align(mod->core_size);
2129 break;
2130 }
2131 }
2132
2133 pr_debug("Init section allocation order:\n");
2134 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2135 for (i = 0; i < info->hdr->e_shnum; ++i) {
2136 Elf_Shdr *s = &info->sechdrs[i];
2137 const char *sname = info->secstrings + s->sh_name;
2138
2139 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2140 || (s->sh_flags & masks[m][1])
2141 || s->sh_entsize != ~0UL
2142 || !strstarts(sname, ".init"))
2143 continue;
2144 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
2145 | INIT_OFFSET_MASK);
2146 pr_debug("\t%s\n", sname);
2147 }
2148 switch (m) {
2149 case 0:
2150 mod->init_size = debug_align(mod->init_size);
2151 mod->init_text_size = mod->init_size;
2152 break;
2153 case 1:
2154 mod->init_size = debug_align(mod->init_size);
2155 mod->init_ro_size = mod->init_size;
2156 break;
2157 case 3:
2158 mod->init_size = debug_align(mod->init_size);
2159 break;
2160 }
2161 }
2162}
2163
2164static void set_license(struct module *mod, const char *license)
2165{
2166 if (!license)
2167 license = "unspecified";
2168
2169 if (!license_is_gpl_compatible(license)) {
2170 if (!test_taint(TAINT_PROPRIETARY_MODULE))
2171 printk(KERN_WARNING "%s: module license '%s' taints "
2172 "kernel.\n", mod->name, license);
2173 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2174 LOCKDEP_NOW_UNRELIABLE);
2175 }
2176}
2177
2178
2179static char *next_string(char *string, unsigned long *secsize)
2180{
2181
2182 while (string[0]) {
2183 string++;
2184 if ((*secsize)-- <= 1)
2185 return NULL;
2186 }
2187
2188
2189 while (!string[0]) {
2190 string++;
2191 if ((*secsize)-- <= 1)
2192 return NULL;
2193 }
2194 return string;
2195}
2196
2197static char *get_modinfo(struct load_info *info, const char *tag)
2198{
2199 char *p;
2200 unsigned int taglen = strlen(tag);
2201 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2202 unsigned long size = infosec->sh_size;
2203
2204 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
2205 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2206 return p + taglen + 1;
2207 }
2208 return NULL;
2209}
2210
2211static void setup_modinfo(struct module *mod, struct load_info *info)
2212{
2213 struct module_attribute *attr;
2214 int i;
2215
2216 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2217 if (attr->setup)
2218 attr->setup(mod, get_modinfo(info, attr->attr.name));
2219 }
2220}
2221
2222static void free_modinfo(struct module *mod)
2223{
2224 struct module_attribute *attr;
2225 int i;
2226
2227 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2228 if (attr->free)
2229 attr->free(mod);
2230 }
2231}
2232
2233#ifdef CONFIG_KALLSYMS
2234
2235
2236static const struct kernel_symbol *lookup_symbol(const char *name,
2237 const struct kernel_symbol *start,
2238 const struct kernel_symbol *stop)
2239{
2240 return bsearch(name, start, stop - start,
2241 sizeof(struct kernel_symbol), cmp_name);
2242}
2243
2244static int is_exported(const char *name, unsigned long value,
2245 const struct module *mod)
2246{
2247 const struct kernel_symbol *ks;
2248 if (!mod)
2249 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
2250 else
2251 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2252 return ks != NULL && ks->value == value;
2253}
2254
2255
2256static char elf_type(const Elf_Sym *sym, const struct load_info *info)
2257{
2258 const Elf_Shdr *sechdrs = info->sechdrs;
2259
2260 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
2261 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
2262 return 'v';
2263 else
2264 return 'w';
2265 }
2266 if (sym->st_shndx == SHN_UNDEF)
2267 return 'U';
2268 if (sym->st_shndx == SHN_ABS)
2269 return 'a';
2270 if (sym->st_shndx >= SHN_LORESERVE)
2271 return '?';
2272 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
2273 return 't';
2274 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
2275 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
2276 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
2277 return 'r';
2278 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2279 return 'g';
2280 else
2281 return 'd';
2282 }
2283 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
2284 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2285 return 's';
2286 else
2287 return 'b';
2288 }
2289 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2290 ".debug")) {
2291 return 'n';
2292 }
2293 return '?';
2294}
2295
2296static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
2297 unsigned int shnum)
2298{
2299 const Elf_Shdr *sec;
2300
2301 if (src->st_shndx == SHN_UNDEF
2302 || src->st_shndx >= shnum
2303 || !src->st_name)
2304 return false;
2305
2306 sec = sechdrs + src->st_shndx;
2307 if (!(sec->sh_flags & SHF_ALLOC)
2308#ifndef CONFIG_KALLSYMS_ALL
2309 || !(sec->sh_flags & SHF_EXECINSTR)
2310#endif
2311 || (sec->sh_entsize & INIT_OFFSET_MASK))
2312 return false;
2313
2314 return true;
2315}
2316
2317
2318
2319
2320
2321
2322
2323
2324static void layout_symtab(struct module *mod, struct load_info *info)
2325{
2326 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2327 Elf_Shdr *strsect = info->sechdrs + info->index.str;
2328 const Elf_Sym *src;
2329 unsigned int i, nsrc, ndst, strtab_size = 0;
2330
2331
2332 symsect->sh_flags |= SHF_ALLOC;
2333 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
2334 info->index.sym) | INIT_OFFSET_MASK;
2335 pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
2336
2337 src = (void *)info->hdr + symsect->sh_offset;
2338 nsrc = symsect->sh_size / sizeof(*src);
2339
2340
2341 for (ndst = i = 0; i < nsrc; i++) {
2342 if (i == 0 ||
2343 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2344 strtab_size += strlen(&info->strtab[src[i].st_name])+1;
2345 ndst++;
2346 }
2347 }
2348
2349
2350 info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
2351 info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
2352 mod->core_size += strtab_size;
2353
2354
2355 strsect->sh_flags |= SHF_ALLOC;
2356 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
2357 info->index.str) | INIT_OFFSET_MASK;
2358 pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
2359}
2360
2361static void add_kallsyms(struct module *mod, const struct load_info *info)
2362{
2363 unsigned int i, ndst;
2364 const Elf_Sym *src;
2365 Elf_Sym *dst;
2366 char *s;
2367 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
2368
2369 mod->symtab = (void *)symsec->sh_addr;
2370 mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
2371
2372 mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
2373
2374
2375 for (i = 0; i < mod->num_symtab; i++)
2376 mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
2377
2378 mod->core_symtab = dst = mod->module_core + info->symoffs;
2379 mod->core_strtab = s = mod->module_core + info->stroffs;
2380 src = mod->symtab;
2381 for (ndst = i = 0; i < mod->num_symtab; i++) {
2382 if (i == 0 ||
2383 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2384 dst[ndst] = src[i];
2385 dst[ndst++].st_name = s - mod->core_strtab;
2386 s += strlcpy(s, &mod->strtab[src[i].st_name],
2387 KSYM_NAME_LEN) + 1;
2388 }
2389 }
2390 mod->core_num_syms = ndst;
2391}
2392#else
2393static inline void layout_symtab(struct module *mod, struct load_info *info)
2394{
2395}
2396
2397static void add_kallsyms(struct module *mod, const struct load_info *info)
2398{
2399}
2400#endif
2401
2402static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
2403{
2404 if (!debug)
2405 return;
2406#ifdef CONFIG_DYNAMIC_DEBUG
2407 if (ddebug_add_module(debug, num, debug->modname))
2408 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2409 debug->modname);
2410#endif
2411}
2412
2413static void dynamic_debug_remove(struct _ddebug *debug)
2414{
2415 if (debug)
2416 ddebug_remove_module(debug->modname);
2417}
2418
2419void * __weak module_alloc(unsigned long size)
2420{
2421 return vmalloc_exec(size);
2422}
2423
2424static void *module_alloc_update_bounds(unsigned long size)
2425{
2426 void *ret = module_alloc(size);
2427
2428 if (ret) {
2429 mutex_lock(&module_mutex);
2430
2431 if ((unsigned long)ret < module_addr_min)
2432 module_addr_min = (unsigned long)ret;
2433 if ((unsigned long)ret + size > module_addr_max)
2434 module_addr_max = (unsigned long)ret + size;
2435 mutex_unlock(&module_mutex);
2436 }
2437 return ret;
2438}
2439
2440#ifdef CONFIG_DEBUG_KMEMLEAK
2441static void kmemleak_load_module(const struct module *mod,
2442 const struct load_info *info)
2443{
2444 unsigned int i;
2445
2446
2447 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
2448
2449 for (i = 1; i < info->hdr->e_shnum; i++) {
2450
2451 if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) ||
2452 !(info->sechdrs[i].sh_flags & SHF_WRITE) ||
2453 (info->sechdrs[i].sh_flags & SHF_EXECINSTR))
2454 continue;
2455
2456 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2457 info->sechdrs[i].sh_size, GFP_KERNEL);
2458 }
2459}
2460#else
2461static inline void kmemleak_load_module(const struct module *mod,
2462 const struct load_info *info)
2463{
2464}
2465#endif
2466
2467#ifdef CONFIG_MODULE_SIG
2468static int module_sig_check(struct load_info *info)
2469{
2470 int err = -ENOKEY;
2471 const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
2472 const void *mod = info->hdr;
2473
2474 if (info->len > markerlen &&
2475 memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) {
2476
2477 info->len -= markerlen;
2478 err = mod_verify_sig(mod, &info->len);
2479 }
2480
2481 if (!err) {
2482 info->sig_ok = true;
2483 return 0;
2484 }
2485
2486
2487 if (err < 0 && fips_enabled)
2488 panic("Module verification failed with error %d in FIPS mode\n",
2489 err);
2490 if (err == -ENOKEY && !sig_enforce)
2491 err = 0;
2492
2493 return err;
2494}
2495#else
2496static int module_sig_check(struct load_info *info)
2497{
2498 return 0;
2499}
2500#endif
2501
2502
2503static int elf_header_check(struct load_info *info)
2504{
2505 if (info->len < sizeof(*(info->hdr)))
2506 return -ENOEXEC;
2507
2508 if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0
2509 || info->hdr->e_type != ET_REL
2510 || !elf_check_arch(info->hdr)
2511 || info->hdr->e_shentsize != sizeof(Elf_Shdr))
2512 return -ENOEXEC;
2513
2514 if (info->hdr->e_shoff >= info->len
2515 || (info->hdr->e_shnum * sizeof(Elf_Shdr) >
2516 info->len - info->hdr->e_shoff))
2517 return -ENOEXEC;
2518
2519 return 0;
2520}
2521
2522
2523static int copy_module_from_user(const void __user *umod, unsigned long len,
2524 struct load_info *info)
2525{
2526 int err;
2527
2528 info->len = len;
2529 if (info->len < sizeof(*(info->hdr)))
2530 return -ENOEXEC;
2531
2532 err = security_kernel_module_from_file(NULL);
2533 if (err)
2534 return err;
2535
2536
2537 info->hdr = vmalloc(info->len);
2538 if (!info->hdr)
2539 return -ENOMEM;
2540
2541 if (copy_from_user(info->hdr, umod, info->len) != 0) {
2542 vfree(info->hdr);
2543 return -EFAULT;
2544 }
2545
2546 return 0;
2547}
2548
2549
2550static int copy_module_from_fd(int fd, struct load_info *info)
2551{
2552 struct fd f = fdget(fd);
2553 int err;
2554 struct kstat stat;
2555 loff_t pos;
2556 ssize_t bytes = 0;
2557
2558 if (!f.file)
2559 return -ENOEXEC;
2560
2561 err = security_kernel_module_from_file(f.file);
2562 if (err)
2563 goto out;
2564
2565 err = vfs_getattr(&f.file->f_path, &stat);
2566 if (err)
2567 goto out;
2568
2569 if (stat.size > INT_MAX) {
2570 err = -EFBIG;
2571 goto out;
2572 }
2573
2574
2575 if (stat.size == 0) {
2576 err = -EINVAL;
2577 goto out;
2578 }
2579
2580 info->hdr = vmalloc(stat.size);
2581 if (!info->hdr) {
2582 err = -ENOMEM;
2583 goto out;
2584 }
2585
2586 pos = 0;
2587 while (pos < stat.size) {
2588 bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos,
2589 stat.size - pos);
2590 if (bytes < 0) {
2591 vfree(info->hdr);
2592 err = bytes;
2593 goto out;
2594 }
2595 if (bytes == 0)
2596 break;
2597 pos += bytes;
2598 }
2599 info->len = pos;
2600
2601out:
2602 fdput(f);
2603 return err;
2604}
2605
2606static void free_copy(struct load_info *info)
2607{
2608 vfree(info->hdr);
2609}
2610
2611static int rewrite_section_headers(struct load_info *info, int flags)
2612{
2613 unsigned int i;
2614
2615
2616 info->sechdrs[0].sh_addr = 0;
2617
2618 for (i = 1; i < info->hdr->e_shnum; i++) {
2619 Elf_Shdr *shdr = &info->sechdrs[i];
2620 if (shdr->sh_type != SHT_NOBITS
2621 && info->len < shdr->sh_offset + shdr->sh_size) {
2622 printk(KERN_ERR "Module len %lu truncated\n",
2623 info->len);
2624 return -ENOEXEC;
2625 }
2626
2627
2628
2629 shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
2630
2631#ifndef CONFIG_MODULE_UNLOAD
2632
2633 if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
2634 shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
2635#endif
2636 }
2637
2638
2639 if (flags & MODULE_INIT_IGNORE_MODVERSIONS)
2640 info->index.vers = 0;
2641 else
2642 info->index.vers = find_sec(info, "__versions");
2643 info->index.info = find_sec(info, ".modinfo");
2644 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2645 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
2646 return 0;
2647}
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657static struct module *setup_load_info(struct load_info *info, int flags)
2658{
2659 unsigned int i;
2660 int err;
2661 struct module *mod;
2662
2663
2664 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
2665 info->secstrings = (void *)info->hdr
2666 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
2667
2668 err = rewrite_section_headers(info, flags);
2669 if (err)
2670 return ERR_PTR(err);
2671
2672
2673 for (i = 1; i < info->hdr->e_shnum; i++) {
2674 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2675 info->index.sym = i;
2676 info->index.str = info->sechdrs[i].sh_link;
2677 info->strtab = (char *)info->hdr
2678 + info->sechdrs[info->index.str].sh_offset;
2679 break;
2680 }
2681 }
2682
2683 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
2684 if (!info->index.mod) {
2685 printk(KERN_WARNING "No module found in object\n");
2686 return ERR_PTR(-ENOEXEC);
2687 }
2688
2689 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2690
2691 if (info->index.sym == 0) {
2692 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2693 mod->name);
2694 return ERR_PTR(-ENOEXEC);
2695 }
2696
2697 info->index.pcpu = find_pcpusec(info);
2698
2699
2700 if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
2701 return ERR_PTR(-ENOEXEC);
2702
2703 return mod;
2704}
2705
2706static int check_modinfo(struct module *mod, struct load_info *info, int flags)
2707{
2708 const char *modmagic = get_modinfo(info, "vermagic");
2709 int err;
2710
2711 if (flags & MODULE_INIT_IGNORE_VERMAGIC)
2712 modmagic = NULL;
2713
2714
2715 if (!modmagic) {
2716 err = try_to_force_load(mod, "bad vermagic");
2717 if (err)
2718 return err;
2719 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
2720 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2721 mod->name, modmagic, vermagic);
2722 return -ENOEXEC;
2723 }
2724
2725 if (!get_modinfo(info, "intree"))
2726 add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK);
2727
2728 if (get_modinfo(info, "staging")) {
2729 add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK);
2730 printk(KERN_WARNING "%s: module is from the staging directory,"
2731 " the quality is unknown, you have been warned.\n",
2732 mod->name);
2733 }
2734
2735
2736 set_license(mod, get_modinfo(info, "license"));
2737
2738 return 0;
2739}
2740
2741static void find_module_sections(struct module *mod, struct load_info *info)
2742{
2743 mod->kp = section_objs(info, "__param",
2744 sizeof(*mod->kp), &mod->num_kp);
2745 mod->syms = section_objs(info, "__ksymtab",
2746 sizeof(*mod->syms), &mod->num_syms);
2747 mod->crcs = section_addr(info, "__kcrctab");
2748 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
2749 sizeof(*mod->gpl_syms),
2750 &mod->num_gpl_syms);
2751 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2752 mod->gpl_future_syms = section_objs(info,
2753 "__ksymtab_gpl_future",
2754 sizeof(*mod->gpl_future_syms),
2755 &mod->num_gpl_future_syms);
2756 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
2757
2758#ifdef CONFIG_UNUSED_SYMBOLS
2759 mod->unused_syms = section_objs(info, "__ksymtab_unused",
2760 sizeof(*mod->unused_syms),
2761 &mod->num_unused_syms);
2762 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
2763 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
2764 sizeof(*mod->unused_gpl_syms),
2765 &mod->num_unused_gpl_syms);
2766 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
2767#endif
2768#ifdef CONFIG_CONSTRUCTORS
2769 mod->ctors = section_objs(info, ".ctors",
2770 sizeof(*mod->ctors), &mod->num_ctors);
2771#endif
2772
2773#ifdef CONFIG_TRACEPOINTS
2774 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
2775 sizeof(*mod->tracepoints_ptrs),
2776 &mod->num_tracepoints);
2777#endif
2778#ifdef HAVE_JUMP_LABEL
2779 mod->jump_entries = section_objs(info, "__jump_table",
2780 sizeof(*mod->jump_entries),
2781 &mod->num_jump_entries);
2782#endif
2783#ifdef CONFIG_EVENT_TRACING
2784 mod->trace_events = section_objs(info, "_ftrace_events",
2785 sizeof(*mod->trace_events),
2786 &mod->num_trace_events);
2787#endif
2788#ifdef CONFIG_TRACING
2789 mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
2790 sizeof(*mod->trace_bprintk_fmt_start),
2791 &mod->num_trace_bprintk_fmt);
2792#endif
2793#ifdef CONFIG_FTRACE_MCOUNT_RECORD
2794
2795 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
2796 sizeof(*mod->ftrace_callsites),
2797 &mod->num_ftrace_callsites);
2798#endif
2799
2800 mod->extable = section_objs(info, "__ex_table",
2801 sizeof(*mod->extable), &mod->num_exentries);
2802
2803 if (section_addr(info, "__obsparm"))
2804 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2805 mod->name);
2806
2807 info->debug = section_objs(info, "__verbose",
2808 sizeof(*info->debug), &info->num_debug);
2809}
2810
2811static int move_module(struct module *mod, struct load_info *info)
2812{
2813 int i;
2814 void *ptr;
2815
2816
2817 ptr = module_alloc_update_bounds(mod->core_size);
2818
2819
2820
2821
2822
2823 kmemleak_not_leak(ptr);
2824 if (!ptr)
2825 return -ENOMEM;
2826
2827 memset(ptr, 0, mod->core_size);
2828 mod->module_core = ptr;
2829
2830 if (mod->init_size) {
2831 ptr = module_alloc_update_bounds(mod->init_size);
2832
2833
2834
2835
2836
2837
2838 kmemleak_ignore(ptr);
2839 if (!ptr) {
2840 module_free(mod, mod->module_core);
2841 return -ENOMEM;
2842 }
2843 memset(ptr, 0, mod->init_size);
2844 mod->module_init = ptr;
2845 } else
2846 mod->module_init = NULL;
2847
2848
2849 pr_debug("final section addresses:\n");
2850 for (i = 0; i < info->hdr->e_shnum; i++) {
2851 void *dest;
2852 Elf_Shdr *shdr = &info->sechdrs[i];
2853
2854 if (!(shdr->sh_flags & SHF_ALLOC))
2855 continue;
2856
2857 if (shdr->sh_entsize & INIT_OFFSET_MASK)
2858 dest = mod->module_init
2859 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
2860 else
2861 dest = mod->module_core + shdr->sh_entsize;
2862
2863 if (shdr->sh_type != SHT_NOBITS)
2864 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
2865
2866 shdr->sh_addr = (unsigned long)dest;
2867 pr_debug("\t0x%lx %s\n",
2868 (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
2869 }
2870
2871 return 0;
2872}
2873
2874static int check_module_license_and_versions(struct module *mod)
2875{
2876
2877
2878
2879
2880
2881 if (strcmp(mod->name, "ndiswrapper") == 0)
2882 add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE);
2883
2884
2885 if (strcmp(mod->name, "driverloader") == 0)
2886 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2887 LOCKDEP_NOW_UNRELIABLE);
2888
2889
2890 if (strcmp(mod->name, "lve") == 0)
2891 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2892 LOCKDEP_NOW_UNRELIABLE);
2893
2894#ifdef CONFIG_MODVERSIONS
2895 if ((mod->num_syms && !mod->crcs)
2896 || (mod->num_gpl_syms && !mod->gpl_crcs)
2897 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2898#ifdef CONFIG_UNUSED_SYMBOLS
2899 || (mod->num_unused_syms && !mod->unused_crcs)
2900 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2901#endif
2902 ) {
2903 return try_to_force_load(mod,
2904 "no versions for exported symbols");
2905 }
2906#endif
2907 return 0;
2908}
2909
2910static void flush_module_icache(const struct module *mod)
2911{
2912 mm_segment_t old_fs;
2913
2914
2915 old_fs = get_fs();
2916 set_fs(KERNEL_DS);
2917
2918
2919
2920
2921
2922
2923 if (mod->module_init)
2924 flush_icache_range((unsigned long)mod->module_init,
2925 (unsigned long)mod->module_init
2926 + mod->init_size);
2927 flush_icache_range((unsigned long)mod->module_core,
2928 (unsigned long)mod->module_core + mod->core_size);
2929
2930 set_fs(old_fs);
2931}
2932
2933int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
2934 Elf_Shdr *sechdrs,
2935 char *secstrings,
2936 struct module *mod)
2937{
2938 return 0;
2939}
2940
2941static struct module *layout_and_allocate(struct load_info *info, int flags)
2942{
2943
2944 struct module *mod;
2945 int err;
2946
2947 mod = setup_load_info(info, flags);
2948 if (IS_ERR(mod))
2949 return mod;
2950
2951 err = check_modinfo(mod, info, flags);
2952 if (err)
2953 return ERR_PTR(err);
2954
2955
2956 err = module_frob_arch_sections(info->hdr, info->sechdrs,
2957 info->secstrings, mod);
2958 if (err < 0)
2959 return ERR_PTR(err);
2960
2961
2962 info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC;
2963
2964
2965
2966
2967 layout_sections(mod, info);
2968 layout_symtab(mod, info);
2969
2970
2971 err = move_module(mod, info);
2972 if (err)
2973 return ERR_PTR(err);
2974
2975
2976 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2977 kmemleak_load_module(mod, info);
2978 return mod;
2979}
2980
2981
2982static void module_deallocate(struct module *mod, struct load_info *info)
2983{
2984 percpu_modfree(mod);
2985 module_free(mod, mod->module_init);
2986 module_free(mod, mod->module_core);
2987}
2988
2989int __weak module_finalize(const Elf_Ehdr *hdr,
2990 const Elf_Shdr *sechdrs,
2991 struct module *me)
2992{
2993 return 0;
2994}
2995
2996static int post_relocation(struct module *mod, const struct load_info *info)
2997{
2998
2999 sort_extable(mod->extable, mod->extable + mod->num_exentries);
3000
3001
3002 percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
3003 info->sechdrs[info->index.pcpu].sh_size);
3004
3005
3006 add_kallsyms(mod, info);
3007
3008
3009 return module_finalize(info->hdr, info->sechdrs, mod);
3010}
3011
3012
3013static bool finished_loading(const char *name)
3014{
3015 struct module *mod;
3016 bool ret;
3017
3018 mutex_lock(&module_mutex);
3019 mod = find_module_all(name, strlen(name), true);
3020 ret = !mod || mod->state == MODULE_STATE_LIVE
3021 || mod->state == MODULE_STATE_GOING;
3022 mutex_unlock(&module_mutex);
3023
3024 return ret;
3025}
3026
3027
3028static void do_mod_ctors(struct module *mod)
3029{
3030#ifdef CONFIG_CONSTRUCTORS
3031 unsigned long i;
3032
3033 for (i = 0; i < mod->num_ctors; i++)
3034 mod->ctors[i]();
3035#endif
3036}
3037
3038
3039static int do_init_module(struct module *mod)
3040{
3041 int ret = 0;
3042
3043
3044
3045
3046
3047 current->flags &= ~PF_USED_ASYNC;
3048
3049 blocking_notifier_call_chain(&module_notify_list,
3050 MODULE_STATE_COMING, mod);
3051
3052
3053 set_section_ro_nx(mod->module_core,
3054 mod->core_text_size,
3055 mod->core_ro_size,
3056 mod->core_size);
3057
3058
3059 set_section_ro_nx(mod->module_init,
3060 mod->init_text_size,
3061 mod->init_ro_size,
3062 mod->init_size);
3063
3064 do_mod_ctors(mod);
3065
3066 if (mod->init != NULL)
3067 ret = do_one_initcall(mod->init);
3068 if (ret < 0) {
3069
3070
3071 mod->state = MODULE_STATE_GOING;
3072 synchronize_sched();
3073 module_put(mod);
3074 blocking_notifier_call_chain(&module_notify_list,
3075 MODULE_STATE_GOING, mod);
3076 free_module(mod);
3077 wake_up_all(&module_wq);
3078 return ret;
3079 }
3080 if (ret > 0) {
3081 printk(KERN_WARNING
3082"%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3083"%s: loading module anyway...\n",
3084 __func__, mod->name, ret,
3085 __func__);
3086 dump_stack();
3087 }
3088
3089
3090 mod->state = MODULE_STATE_LIVE;
3091 blocking_notifier_call_chain(&module_notify_list,
3092 MODULE_STATE_LIVE, mod);
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111 if (current->flags & PF_USED_ASYNC)
3112 async_synchronize_full();
3113
3114 mutex_lock(&module_mutex);
3115
3116 module_put(mod);
3117 trim_init_extable(mod);
3118#ifdef CONFIG_KALLSYMS
3119 mod->num_symtab = mod->core_num_syms;
3120 mod->symtab = mod->core_symtab;
3121 mod->strtab = mod->core_strtab;
3122#endif
3123 unset_module_init_ro_nx(mod);
3124 module_free(mod, mod->module_init);
3125 mod->module_init = NULL;
3126 mod->init_size = 0;
3127 mod->init_ro_size = 0;
3128 mod->init_text_size = 0;
3129 mutex_unlock(&module_mutex);
3130 wake_up_all(&module_wq);
3131
3132 return 0;
3133}
3134
3135static int may_init_module(void)
3136{
3137 if (!capable(CAP_SYS_MODULE) || modules_disabled)
3138 return -EPERM;
3139
3140 return 0;
3141}
3142
3143
3144
3145
3146
3147
3148static int add_unformed_module(struct module *mod)
3149{
3150 int err;
3151 struct module *old;
3152
3153 mod->state = MODULE_STATE_UNFORMED;
3154
3155again:
3156 mutex_lock(&module_mutex);
3157 old = find_module_all(mod->name, strlen(mod->name), true);
3158 if (old != NULL) {
3159 if (old->state == MODULE_STATE_COMING
3160 || old->state == MODULE_STATE_UNFORMED) {
3161
3162 mutex_unlock(&module_mutex);
3163 err = wait_event_interruptible(module_wq,
3164 finished_loading(mod->name));
3165 if (err)
3166 goto out_unlocked;
3167 goto again;
3168 }
3169 err = -EEXIST;
3170 goto out;
3171 }
3172 list_add_rcu(&mod->list, &modules);
3173 err = 0;
3174
3175out:
3176 mutex_unlock(&module_mutex);
3177out_unlocked:
3178 return err;
3179}
3180
3181static int complete_formation(struct module *mod, struct load_info *info)
3182{
3183 int err;
3184
3185 mutex_lock(&module_mutex);
3186
3187
3188 err = verify_export_symbols(mod);
3189 if (err < 0)
3190 goto out;
3191
3192
3193 module_bug_finalize(info->hdr, info->sechdrs, mod);
3194
3195
3196
3197 mod->state = MODULE_STATE_COMING;
3198
3199out:
3200 mutex_unlock(&module_mutex);
3201 return err;
3202}
3203
3204static int unknown_module_param_cb(char *param, char *val, const char *modname)
3205{
3206
3207 int ret = ddebug_dyndbg_module_param_cb(param, val, modname);
3208 if (ret != 0) {
3209 printk(KERN_WARNING "%s: unknown parameter '%s' ignored\n",
3210 modname, param);
3211 }
3212 return 0;
3213}
3214
3215
3216
3217static int load_module(struct load_info *info, const char __user *uargs,
3218 int flags)
3219{
3220 struct module *mod;
3221 long err;
3222
3223 err = module_sig_check(info);
3224 if (err)
3225 goto free_copy;
3226
3227 err = elf_header_check(info);
3228 if (err)
3229 goto free_copy;
3230
3231
3232 mod = layout_and_allocate(info, flags);
3233 if (IS_ERR(mod)) {
3234 err = PTR_ERR(mod);
3235 goto free_copy;
3236 }
3237
3238
3239 err = add_unformed_module(mod);
3240 if (err)
3241 goto free_module;
3242
3243#ifdef CONFIG_MODULE_SIG
3244 mod->sig_ok = info->sig_ok;
3245 if (!mod->sig_ok) {
3246 printk_once(KERN_NOTICE
3247 "%s: module verification failed: signature and/or"
3248 " required key missing - tainting kernel\n",
3249 mod->name);
3250 add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_STILL_OK);
3251 }
3252#endif
3253
3254
3255 err = percpu_modalloc(mod, info);
3256 if (err)
3257 goto unlink_mod;
3258
3259
3260 err = module_unload_init(mod);
3261 if (err)
3262 goto unlink_mod;
3263
3264
3265
3266 find_module_sections(mod, info);
3267
3268 err = check_module_license_and_versions(mod);
3269 if (err)
3270 goto free_unload;
3271
3272
3273 setup_modinfo(mod, info);
3274
3275
3276 err = simplify_symbols(mod, info);
3277 if (err < 0)
3278 goto free_modinfo;
3279
3280 err = apply_relocations(mod, info);
3281 if (err < 0)
3282 goto free_modinfo;
3283
3284 err = post_relocation(mod, info);
3285 if (err < 0)
3286 goto free_modinfo;
3287
3288 flush_module_icache(mod);
3289
3290
3291 mod->args = strndup_user(uargs, ~0UL >> 1);
3292 if (IS_ERR(mod->args)) {
3293 err = PTR_ERR(mod->args);
3294 goto free_arch_cleanup;
3295 }
3296
3297 dynamic_debug_setup(info->debug, info->num_debug);
3298
3299
3300 err = complete_formation(mod, info);
3301 if (err)
3302 goto ddebug_cleanup;
3303
3304
3305 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
3306 -32768, 32767, unknown_module_param_cb);
3307 if (err < 0)
3308 goto bug_cleanup;
3309
3310
3311 err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
3312 if (err < 0)
3313 goto bug_cleanup;
3314
3315
3316 free_copy(info);
3317
3318
3319 trace_module_load(mod);
3320
3321 return do_init_module(mod);
3322
3323 bug_cleanup:
3324
3325 mutex_lock(&module_mutex);
3326 module_bug_cleanup(mod);
3327 mutex_unlock(&module_mutex);
3328 ddebug_cleanup:
3329 dynamic_debug_remove(info->debug);
3330 synchronize_sched();
3331 kfree(mod->args);
3332 free_arch_cleanup:
3333 module_arch_cleanup(mod);
3334 free_modinfo:
3335 free_modinfo(mod);
3336 free_unload:
3337 module_unload_free(mod);
3338 unlink_mod:
3339 mutex_lock(&module_mutex);
3340
3341 list_del_rcu(&mod->list);
3342 wake_up_all(&module_wq);
3343 mutex_unlock(&module_mutex);
3344 free_module:
3345 module_deallocate(mod, info);
3346 free_copy:
3347 free_copy(info);
3348 return err;
3349}
3350
3351SYSCALL_DEFINE3(init_module, void __user *, umod,
3352 unsigned long, len, const char __user *, uargs)
3353{
3354 int err;
3355 struct load_info info = { };
3356
3357 err = may_init_module();
3358 if (err)
3359 return err;
3360
3361 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3362 umod, len, uargs);
3363
3364 err = copy_module_from_user(umod, len, &info);
3365 if (err)
3366 return err;
3367
3368 return load_module(&info, uargs, 0);
3369}
3370
3371SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
3372{
3373 int err;
3374 struct load_info info = { };
3375
3376 err = may_init_module();
3377 if (err)
3378 return err;
3379
3380 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags);
3381
3382 if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS
3383 |MODULE_INIT_IGNORE_VERMAGIC))
3384 return -EINVAL;
3385
3386 err = copy_module_from_fd(fd, &info);
3387 if (err)
3388 return err;
3389
3390 return load_module(&info, uargs, flags);
3391}
3392
3393static inline int within(unsigned long addr, void *start, unsigned long size)
3394{
3395 return ((void *)addr >= start && (void *)addr < start + size);
3396}
3397
3398#ifdef CONFIG_KALLSYMS
3399
3400
3401
3402
3403static inline int is_arm_mapping_symbol(const char *str)
3404{
3405 return str[0] == '$' && strchr("atd", str[1])
3406 && (str[2] == '\0' || str[2] == '.');
3407}
3408
3409static const char *get_ksymbol(struct module *mod,
3410 unsigned long addr,
3411 unsigned long *size,
3412 unsigned long *offset)
3413{
3414 unsigned int i, best = 0;
3415 unsigned long nextval;
3416
3417
3418 if (within_module_init(addr, mod))
3419 nextval = (unsigned long)mod->module_init+mod->init_text_size;
3420 else
3421 nextval = (unsigned long)mod->module_core+mod->core_text_size;
3422
3423
3424
3425 for (i = 1; i < mod->num_symtab; i++) {
3426 if (mod->symtab[i].st_shndx == SHN_UNDEF)
3427 continue;
3428
3429
3430
3431 if (mod->symtab[i].st_value <= addr
3432 && mod->symtab[i].st_value > mod->symtab[best].st_value
3433 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3434 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3435 best = i;
3436 if (mod->symtab[i].st_value > addr
3437 && mod->symtab[i].st_value < nextval
3438 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3439 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3440 nextval = mod->symtab[i].st_value;
3441 }
3442
3443 if (!best)
3444 return NULL;
3445
3446 if (size)
3447 *size = nextval - mod->symtab[best].st_value;
3448 if (offset)
3449 *offset = addr - mod->symtab[best].st_value;
3450 return mod->strtab + mod->symtab[best].st_name;
3451}
3452
3453
3454
3455const char *module_address_lookup(unsigned long addr,
3456 unsigned long *size,
3457 unsigned long *offset,
3458 char **modname,
3459 char *namebuf)
3460{
3461 struct module *mod;
3462 const char *ret = NULL;
3463
3464 preempt_disable();
3465 list_for_each_entry_rcu(mod, &modules, list) {
3466 if (mod->state == MODULE_STATE_UNFORMED)
3467 continue;
3468 if (within_module_init(addr, mod) ||
3469 within_module_core(addr, mod)) {
3470 if (modname)
3471 *modname = mod->name;
3472 ret = get_ksymbol(mod, addr, size, offset);
3473 break;
3474 }
3475 }
3476
3477 if (ret) {
3478 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
3479 ret = namebuf;
3480 }
3481 preempt_enable();
3482 return ret;
3483}
3484
3485int lookup_module_symbol_name(unsigned long addr, char *symname)
3486{
3487 struct module *mod;
3488
3489 preempt_disable();
3490 list_for_each_entry_rcu(mod, &modules, list) {
3491 if (mod->state == MODULE_STATE_UNFORMED)
3492 continue;
3493 if (within_module_init(addr, mod) ||
3494 within_module_core(addr, mod)) {
3495 const char *sym;
3496
3497 sym = get_ksymbol(mod, addr, NULL, NULL);
3498 if (!sym)
3499 goto out;
3500 strlcpy(symname, sym, KSYM_NAME_LEN);
3501 preempt_enable();
3502 return 0;
3503 }
3504 }
3505out:
3506 preempt_enable();
3507 return -ERANGE;
3508}
3509
3510int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
3511 unsigned long *offset, char *modname, char *name)
3512{
3513 struct module *mod;
3514
3515 preempt_disable();
3516 list_for_each_entry_rcu(mod, &modules, list) {
3517 if (mod->state == MODULE_STATE_UNFORMED)
3518 continue;
3519 if (within_module_init(addr, mod) ||
3520 within_module_core(addr, mod)) {
3521 const char *sym;
3522
3523 sym = get_ksymbol(mod, addr, size, offset);
3524 if (!sym)
3525 goto out;
3526 if (modname)
3527 strlcpy(modname, mod->name, MODULE_NAME_LEN);
3528 if (name)
3529 strlcpy(name, sym, KSYM_NAME_LEN);
3530 preempt_enable();
3531 return 0;
3532 }
3533 }
3534out:
3535 preempt_enable();
3536 return -ERANGE;
3537}
3538
3539int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3540 char *name, char *module_name, int *exported)
3541{
3542 struct module *mod;
3543
3544 preempt_disable();
3545 list_for_each_entry_rcu(mod, &modules, list) {
3546 if (mod->state == MODULE_STATE_UNFORMED)
3547 continue;
3548 if (symnum < mod->num_symtab) {
3549 *value = mod->symtab[symnum].st_value;
3550 *type = mod->symtab[symnum].st_info;
3551 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
3552 KSYM_NAME_LEN);
3553 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
3554 *exported = is_exported(name, *value, mod);
3555 preempt_enable();
3556 return 0;
3557 }
3558 symnum -= mod->num_symtab;
3559 }
3560 preempt_enable();
3561 return -ERANGE;
3562}
3563
3564static unsigned long mod_find_symname(struct module *mod, const char *name)
3565{
3566 unsigned int i;
3567
3568 for (i = 0; i < mod->num_symtab; i++)
3569 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
3570 mod->symtab[i].st_info != 'U')
3571 return mod->symtab[i].st_value;
3572 return 0;
3573}
3574
3575
3576unsigned long module_kallsyms_lookup_name(const char *name)
3577{
3578 struct module *mod;
3579 char *colon;
3580 unsigned long ret = 0;
3581
3582
3583 preempt_disable();
3584 if ((colon = strchr(name, ':')) != NULL) {
3585 if ((mod = find_module_all(name, colon - name, false)) != NULL)
3586 ret = mod_find_symname(mod, colon+1);
3587 } else {
3588 list_for_each_entry_rcu(mod, &modules, list) {
3589 if (mod->state == MODULE_STATE_UNFORMED)
3590 continue;
3591 if ((ret = mod_find_symname(mod, name)) != 0)
3592 break;
3593 }
3594 }
3595 preempt_enable();
3596 return ret;
3597}
3598
3599int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
3600 struct module *, unsigned long),
3601 void *data)
3602{
3603 struct module *mod;
3604 unsigned int i;
3605 int ret;
3606
3607 list_for_each_entry(mod, &modules, list) {
3608 if (mod->state == MODULE_STATE_UNFORMED)
3609 continue;
3610 for (i = 0; i < mod->num_symtab; i++) {
3611 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
3612 mod, mod->symtab[i].st_value);
3613 if (ret != 0)
3614 return ret;
3615 }
3616 }
3617 return 0;
3618}
3619#endif
3620
3621static char *module_flags(struct module *mod, char *buf)
3622{
3623 int bx = 0;
3624
3625 BUG_ON(mod->state == MODULE_STATE_UNFORMED);
3626 if (mod->taints ||
3627 mod->state == MODULE_STATE_GOING ||
3628 mod->state == MODULE_STATE_COMING) {
3629 buf[bx++] = '(';
3630 bx += module_flags_taint(mod, buf + bx);
3631
3632 if (mod->state == MODULE_STATE_GOING)
3633 buf[bx++] = '-';
3634
3635 if (mod->state == MODULE_STATE_COMING)
3636 buf[bx++] = '+';
3637 buf[bx++] = ')';
3638 }
3639 buf[bx] = '\0';
3640
3641 return buf;
3642}
3643
3644#ifdef CONFIG_PROC_FS
3645
3646static void *m_start(struct seq_file *m, loff_t *pos)
3647{
3648 mutex_lock(&module_mutex);
3649 return seq_list_start(&modules, *pos);
3650}
3651
3652static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3653{
3654 return seq_list_next(p, &modules, pos);
3655}
3656
3657static void m_stop(struct seq_file *m, void *p)
3658{
3659 mutex_unlock(&module_mutex);
3660}
3661
3662static int m_show(struct seq_file *m, void *p)
3663{
3664 struct module *mod = list_entry(p, struct module, list);
3665 char buf[8];
3666
3667
3668 if (mod->state == MODULE_STATE_UNFORMED)
3669 return 0;
3670
3671 seq_printf(m, "%s %u",
3672 mod->name, mod->init_size + mod->core_size);
3673 print_unload_info(m, mod);
3674
3675
3676 seq_printf(m, " %s",
3677 mod->state == MODULE_STATE_GOING ? "Unloading":
3678 mod->state == MODULE_STATE_COMING ? "Loading":
3679 "Live");
3680
3681 seq_printf(m, " 0x%pK", mod->module_core);
3682
3683
3684 if (mod->taints)
3685 seq_printf(m, " %s", module_flags(mod, buf));
3686
3687 seq_printf(m, "\n");
3688 return 0;
3689}
3690
3691
3692
3693
3694
3695
3696static const struct seq_operations modules_op = {
3697 .start = m_start,
3698 .next = m_next,
3699 .stop = m_stop,
3700 .show = m_show
3701};
3702
3703static int modules_open(struct inode *inode, struct file *file)
3704{
3705 return seq_open(file, &modules_op);
3706}
3707
3708static const struct file_operations proc_modules_operations = {
3709 .open = modules_open,
3710 .read = seq_read,
3711 .llseek = seq_lseek,
3712 .release = seq_release,
3713};
3714
3715static int __init proc_modules_init(void)
3716{
3717 proc_create("modules", 0, NULL, &proc_modules_operations);
3718 return 0;
3719}
3720module_init(proc_modules_init);
3721#endif
3722
3723
3724const struct exception_table_entry *search_module_extables(unsigned long addr)
3725{
3726 const struct exception_table_entry *e = NULL;
3727 struct module *mod;
3728
3729 preempt_disable();
3730 list_for_each_entry_rcu(mod, &modules, list) {
3731 if (mod->state == MODULE_STATE_UNFORMED)
3732 continue;
3733 if (mod->num_exentries == 0)
3734 continue;
3735
3736 e = search_extable(mod->extable,
3737 mod->extable + mod->num_exentries - 1,
3738 addr);
3739 if (e)
3740 break;
3741 }
3742 preempt_enable();
3743
3744
3745
3746 return e;
3747}
3748
3749
3750
3751
3752
3753
3754
3755
3756bool is_module_address(unsigned long addr)
3757{
3758 bool ret;
3759
3760 preempt_disable();
3761 ret = __module_address(addr) != NULL;
3762 preempt_enable();
3763
3764 return ret;
3765}
3766
3767
3768
3769
3770
3771
3772
3773
3774struct module *__module_address(unsigned long addr)
3775{
3776 struct module *mod;
3777
3778 if (addr < module_addr_min || addr > module_addr_max)
3779 return NULL;
3780
3781 list_for_each_entry_rcu(mod, &modules, list) {
3782 if (mod->state == MODULE_STATE_UNFORMED)
3783 continue;
3784 if (within_module_core(addr, mod)
3785 || within_module_init(addr, mod))
3786 return mod;
3787 }
3788 return NULL;
3789}
3790EXPORT_SYMBOL_GPL(__module_address);
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800bool is_module_text_address(unsigned long addr)
3801{
3802 bool ret;
3803
3804 preempt_disable();
3805 ret = __module_text_address(addr) != NULL;
3806 preempt_enable();
3807
3808 return ret;
3809}
3810
3811
3812
3813
3814
3815
3816
3817
3818struct module *__module_text_address(unsigned long addr)
3819{
3820 struct module *mod = __module_address(addr);
3821 if (mod) {
3822
3823 if (!within(addr, mod->module_init, mod->init_text_size)
3824 && !within(addr, mod->module_core, mod->core_text_size))
3825 mod = NULL;
3826 }
3827 return mod;
3828}
3829EXPORT_SYMBOL_GPL(__module_text_address);
3830
3831
3832void print_modules(void)
3833{
3834 struct module *mod;
3835 char buf[8];
3836
3837 printk(KERN_DEFAULT "Modules linked in:");
3838
3839 preempt_disable();
3840 list_for_each_entry_rcu(mod, &modules, list) {
3841 if (mod->state == MODULE_STATE_UNFORMED)
3842 continue;
3843 printk(" %s%s", mod->name, module_flags(mod, buf));
3844 }
3845 preempt_enable();
3846 if (last_unloaded_module[0])
3847 printk(" [last unloaded: %s]", last_unloaded_module);
3848 printk("\n");
3849}
3850
3851#ifdef CONFIG_MODVERSIONS
3852
3853
3854void module_layout(struct module *mod,
3855 struct modversion_info *ver,
3856 struct kernel_param *kp,
3857 struct kernel_symbol *ks,
3858 struct tracepoint * const *tp)
3859{
3860}
3861EXPORT_SYMBOL(module_layout);
3862#endif
3863