2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
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.
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.
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
19 #include <linux/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/init.h>
22 #include <linux/kallsyms.h>
23 #include <linux/sysfs.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27 #include <linux/elf.h>
28 #include <linux/seq_file.h>
29 #include <linux/syscalls.h>
30 #include <linux/fcntl.h>
31 #include <linux/rcupdate.h>
32 #include <linux/capability.h>
33 #include <linux/cpu.h>
34 #include <linux/moduleparam.h>
35 #include <linux/errno.h>
36 #include <linux/err.h>
37 #include <linux/vermagic.h>
38 #include <linux/notifier.h>
39 #include <linux/sched.h>
40 #include <linux/stop_machine.h>
41 #include <linux/device.h>
42 #include <linux/string.h>
43 #include <linux/mutex.h>
44 #include <linux/unwind.h>
45 #include <asm/uaccess.h>
46 #include <asm/cacheflush.h>
47 #include <linux/license.h>
48 #include <asm/sections.h>
49 #include <linux/tracepoint.h>
50 #include <linux/ftrace.h>
55 #define DEBUGP(fmt , a...)
58 #ifndef ARCH_SHF_SMALL
59 #define ARCH_SHF_SMALL 0
62 /* If this is set, the section belongs in the init part of the module */
63 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
65 /* List of modules, protected by module_mutex or preempt_disable
66 * (add/delete uses stop_machine). */
67 static DEFINE_MUTEX(module_mutex);
68 static LIST_HEAD(modules);
70 /* Waiting for a module to finish initializing? */
71 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
73 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
75 /* Bounds of module allocation, for speeding __module_text_address */
76 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
78 int register_module_notifier(struct notifier_block * nb)
80 return blocking_notifier_chain_register(&module_notify_list, nb);
82 EXPORT_SYMBOL(register_module_notifier);
84 int unregister_module_notifier(struct notifier_block * nb)
86 return blocking_notifier_chain_unregister(&module_notify_list, nb);
88 EXPORT_SYMBOL(unregister_module_notifier);
90 /* We require a truly strong try_module_get(): 0 means failure due to
91 ongoing or failed initialization etc. */
92 static inline int strong_try_module_get(struct module *mod)
94 if (mod && mod->state == MODULE_STATE_COMING)
96 if (try_module_get(mod))
102 static inline void add_taint_module(struct module *mod, unsigned flag)
109 * A thread that wants to hold a reference to a module only while it
110 * is running can call this to safely exit. nfsd and lockd use this.
112 void __module_put_and_exit(struct module *mod, long code)
117 EXPORT_SYMBOL(__module_put_and_exit);
119 /* Find a module section: 0 means not found. */
120 static unsigned int find_sec(Elf_Ehdr *hdr,
122 const char *secstrings,
127 for (i = 1; i < hdr->e_shnum; i++)
128 /* Alloc bit cleared means "ignore it." */
129 if ((sechdrs[i].sh_flags & SHF_ALLOC)
130 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
135 /* Provided by the linker */
136 extern const struct kernel_symbol __start___ksymtab[];
137 extern const struct kernel_symbol __stop___ksymtab[];
138 extern const struct kernel_symbol __start___ksymtab_gpl[];
139 extern const struct kernel_symbol __stop___ksymtab_gpl[];
140 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
141 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
142 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
143 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
144 extern const unsigned long __start___kcrctab[];
145 extern const unsigned long __start___kcrctab_gpl[];
146 extern const unsigned long __start___kcrctab_gpl_future[];
147 #ifdef CONFIG_UNUSED_SYMBOLS
148 extern const struct kernel_symbol __start___ksymtab_unused[];
149 extern const struct kernel_symbol __stop___ksymtab_unused[];
150 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
151 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
152 extern const unsigned long __start___kcrctab_unused[];
153 extern const unsigned long __start___kcrctab_unused_gpl[];
156 #ifndef CONFIG_MODVERSIONS
157 #define symversion(base, idx) NULL
159 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
163 const struct kernel_symbol *start, *stop;
164 const unsigned long *crcs;
173 static bool each_symbol_in_section(const struct symsearch *arr,
174 unsigned int arrsize,
175 struct module *owner,
176 bool (*fn)(const struct symsearch *syms,
177 struct module *owner,
178 unsigned int symnum, void *data),
183 for (j = 0; j < arrsize; j++) {
184 for (i = 0; i < arr[j].stop - arr[j].start; i++)
185 if (fn(&arr[j], owner, i, data))
192 /* Returns true as soon as fn returns true, otherwise false. */
193 static bool each_symbol(bool (*fn)(const struct symsearch *arr,
194 struct module *owner,
195 unsigned int symnum, void *data),
199 const struct symsearch arr[] = {
200 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
201 NOT_GPL_ONLY, false },
202 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
203 __start___kcrctab_gpl,
205 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
206 __start___kcrctab_gpl_future,
207 WILL_BE_GPL_ONLY, false },
208 #ifdef CONFIG_UNUSED_SYMBOLS
209 { __start___ksymtab_unused, __stop___ksymtab_unused,
210 __start___kcrctab_unused,
211 NOT_GPL_ONLY, true },
212 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
213 __start___kcrctab_unused_gpl,
218 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
221 list_for_each_entry(mod, &modules, list) {
222 struct symsearch arr[] = {
223 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
224 NOT_GPL_ONLY, false },
225 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
228 { mod->gpl_future_syms,
229 mod->gpl_future_syms + mod->num_gpl_future_syms,
230 mod->gpl_future_crcs,
231 WILL_BE_GPL_ONLY, false },
232 #ifdef CONFIG_UNUSED_SYMBOLS
234 mod->unused_syms + mod->num_unused_syms,
236 NOT_GPL_ONLY, true },
237 { mod->unused_gpl_syms,
238 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
239 mod->unused_gpl_crcs,
244 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
250 struct find_symbol_arg {
257 struct module *owner;
258 const unsigned long *crc;
262 static bool find_symbol_in_section(const struct symsearch *syms,
263 struct module *owner,
264 unsigned int symnum, void *data)
266 struct find_symbol_arg *fsa = data;
268 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
272 if (syms->licence == GPL_ONLY)
274 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
275 printk(KERN_WARNING "Symbol %s is being used "
276 "by a non-GPL module, which will not "
277 "be allowed in the future\n", fsa->name);
278 printk(KERN_WARNING "Please see the file "
279 "Documentation/feature-removal-schedule.txt "
280 "in the kernel source tree for more details.\n");
284 #ifdef CONFIG_UNUSED_SYMBOLS
285 if (syms->unused && fsa->warn) {
286 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
287 "however this module is using it.\n", fsa->name);
289 "This symbol will go away in the future.\n");
291 "Please evalute if this is the right api to use and if "
292 "it really is, submit a report the linux kernel "
293 "mailinglist together with submitting your code for "
299 fsa->crc = symversion(syms->crcs, symnum);
300 fsa->value = syms->start[symnum].value;
304 /* Find a symbol, return value, (optional) crc and (optional) module
306 static unsigned long find_symbol(const char *name,
307 struct module **owner,
308 const unsigned long **crc,
312 struct find_symbol_arg fsa;
318 if (each_symbol(find_symbol_in_section, &fsa)) {
326 DEBUGP("Failed to find symbol %s\n", name);
330 /* Search for module by name: must hold module_mutex. */
331 static struct module *find_module(const char *name)
335 list_for_each_entry(mod, &modules, list) {
336 if (strcmp(mod->name, name) == 0)
343 /* Number of blocks used and allocated. */
344 static unsigned int pcpu_num_used, pcpu_num_allocated;
345 /* Size of each block. -ve means used. */
346 static int *pcpu_size;
348 static int split_block(unsigned int i, unsigned short size)
350 /* Reallocation required? */
351 if (pcpu_num_used + 1 > pcpu_num_allocated) {
354 new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
359 pcpu_num_allocated *= 2;
363 /* Insert a new subblock */
364 memmove(&pcpu_size[i+1], &pcpu_size[i],
365 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
368 pcpu_size[i+1] -= size;
373 static inline unsigned int block_size(int val)
380 static void *percpu_modalloc(unsigned long size, unsigned long align,
387 if (align > PAGE_SIZE) {
388 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
389 name, align, PAGE_SIZE);
393 ptr = __per_cpu_start;
394 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
395 /* Extra for alignment requirement. */
396 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
397 BUG_ON(i == 0 && extra != 0);
399 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
402 /* Transfer extra to previous block. */
403 if (pcpu_size[i-1] < 0)
404 pcpu_size[i-1] -= extra;
406 pcpu_size[i-1] += extra;
407 pcpu_size[i] -= extra;
410 /* Split block if warranted */
411 if (pcpu_size[i] - size > sizeof(unsigned long))
412 if (!split_block(i, size))
416 pcpu_size[i] = -pcpu_size[i];
420 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
425 static void percpu_modfree(void *freeme)
428 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
430 /* First entry is core kernel percpu data. */
431 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
433 pcpu_size[i] = -pcpu_size[i];
440 /* Merge with previous? */
441 if (pcpu_size[i-1] >= 0) {
442 pcpu_size[i-1] += pcpu_size[i];
444 memmove(&pcpu_size[i], &pcpu_size[i+1],
445 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
448 /* Merge with next? */
449 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
450 pcpu_size[i] += pcpu_size[i+1];
452 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
453 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
457 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
459 const char *secstrings)
461 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
464 static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
468 for_each_possible_cpu(cpu)
469 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
472 static int percpu_modinit(void)
475 pcpu_num_allocated = 2;
476 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
478 /* Static in-kernel percpu data (used). */
479 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
481 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
482 if (pcpu_size[1] < 0) {
483 printk(KERN_ERR "No per-cpu room for modules.\n");
489 __initcall(percpu_modinit);
490 #else /* ... !CONFIG_SMP */
491 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
496 static inline void percpu_modfree(void *pcpuptr)
500 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
502 const char *secstrings)
506 static inline void percpu_modcopy(void *pcpudst, const void *src,
509 /* pcpusec should be 0, and size of that section should be 0. */
512 #endif /* CONFIG_SMP */
514 #define MODINFO_ATTR(field) \
515 static void setup_modinfo_##field(struct module *mod, const char *s) \
517 mod->field = kstrdup(s, GFP_KERNEL); \
519 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
520 struct module *mod, char *buffer) \
522 return sprintf(buffer, "%s\n", mod->field); \
524 static int modinfo_##field##_exists(struct module *mod) \
526 return mod->field != NULL; \
528 static void free_modinfo_##field(struct module *mod) \
533 static struct module_attribute modinfo_##field = { \
534 .attr = { .name = __stringify(field), .mode = 0444 }, \
535 .show = show_modinfo_##field, \
536 .setup = setup_modinfo_##field, \
537 .test = modinfo_##field##_exists, \
538 .free = free_modinfo_##field, \
541 MODINFO_ATTR(version);
542 MODINFO_ATTR(srcversion);
544 static char last_unloaded_module[MODULE_NAME_LEN+1];
546 #ifdef CONFIG_MODULE_UNLOAD
547 /* Init the unload section of the module. */
548 static void module_unload_init(struct module *mod)
552 INIT_LIST_HEAD(&mod->modules_which_use_me);
553 for (i = 0; i < NR_CPUS; i++)
554 local_set(&mod->ref[i].count, 0);
555 /* Hold reference count during initialization. */
556 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
557 /* Backwards compatibility macros put refcount during init. */
558 mod->waiter = current;
561 /* modules using other modules */
564 struct list_head list;
565 struct module *module_which_uses;
568 /* Does a already use b? */
569 static int already_uses(struct module *a, struct module *b)
571 struct module_use *use;
573 list_for_each_entry(use, &b->modules_which_use_me, list) {
574 if (use->module_which_uses == a) {
575 DEBUGP("%s uses %s!\n", a->name, b->name);
579 DEBUGP("%s does not use %s!\n", a->name, b->name);
583 /* Module a uses b */
584 static int use_module(struct module *a, struct module *b)
586 struct module_use *use;
589 if (b == NULL || already_uses(a, b)) return 1;
591 /* If we're interrupted or time out, we fail. */
592 if (wait_event_interruptible_timeout(
593 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
595 printk("%s: gave up waiting for init of module %s.\n",
600 /* If strong_try_module_get() returned a different error, we fail. */
604 DEBUGP("Allocating new usage for %s.\n", a->name);
605 use = kmalloc(sizeof(*use), GFP_ATOMIC);
607 printk("%s: out of memory loading\n", a->name);
612 use->module_which_uses = a;
613 list_add(&use->list, &b->modules_which_use_me);
614 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
618 /* Clear the unload stuff of the module. */
619 static void module_unload_free(struct module *mod)
623 list_for_each_entry(i, &modules, list) {
624 struct module_use *use;
626 list_for_each_entry(use, &i->modules_which_use_me, list) {
627 if (use->module_which_uses == mod) {
628 DEBUGP("%s unusing %s\n", mod->name, i->name);
630 list_del(&use->list);
632 sysfs_remove_link(i->holders_dir, mod->name);
633 /* There can be at most one match. */
640 #ifdef CONFIG_MODULE_FORCE_UNLOAD
641 static inline int try_force_unload(unsigned int flags)
643 int ret = (flags & O_TRUNC);
645 add_taint(TAINT_FORCED_RMMOD);
649 static inline int try_force_unload(unsigned int flags)
653 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
662 /* Whole machine is stopped with interrupts off when this runs. */
663 static int __try_stop_module(void *_sref)
665 struct stopref *sref = _sref;
667 /* If it's not unused, quit unless we're forcing. */
668 if (module_refcount(sref->mod) != 0) {
669 if (!(*sref->forced = try_force_unload(sref->flags)))
673 /* Mark it as dying. */
674 sref->mod->state = MODULE_STATE_GOING;
678 static int try_stop_module(struct module *mod, int flags, int *forced)
680 if (flags & O_NONBLOCK) {
681 struct stopref sref = { mod, flags, forced };
683 return stop_machine(__try_stop_module, &sref, NULL);
685 /* We don't need to stop the machine for this. */
686 mod->state = MODULE_STATE_GOING;
692 unsigned int module_refcount(struct module *mod)
694 unsigned int i, total = 0;
696 for (i = 0; i < NR_CPUS; i++)
697 total += local_read(&mod->ref[i].count);
700 EXPORT_SYMBOL(module_refcount);
702 /* This exists whether we can unload or not */
703 static void free_module(struct module *mod);
705 static void wait_for_zero_refcount(struct module *mod)
707 /* Since we might sleep for some time, release the mutex first */
708 mutex_unlock(&module_mutex);
710 DEBUGP("Looking at refcount...\n");
711 set_current_state(TASK_UNINTERRUPTIBLE);
712 if (module_refcount(mod) == 0)
716 current->state = TASK_RUNNING;
717 mutex_lock(&module_mutex);
721 sys_delete_module(const char __user *name_user, unsigned int flags)
724 char name[MODULE_NAME_LEN];
727 if (!capable(CAP_SYS_MODULE))
730 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
732 name[MODULE_NAME_LEN-1] = '\0';
734 if (mutex_lock_interruptible(&module_mutex) != 0)
737 mod = find_module(name);
743 if (!list_empty(&mod->modules_which_use_me)) {
744 /* Other modules depend on us: get rid of them first. */
749 /* Doing init or already dying? */
750 if (mod->state != MODULE_STATE_LIVE) {
751 /* FIXME: if (force), slam module count and wake up
753 DEBUGP("%s already dying\n", mod->name);
758 /* If it has an init func, it must have an exit func to unload */
759 if (mod->init && !mod->exit) {
760 forced = try_force_unload(flags);
762 /* This module can't be removed */
768 /* Set this up before setting mod->state */
769 mod->waiter = current;
771 /* Stop the machine so refcounts can't move and disable module. */
772 ret = try_stop_module(mod, flags, &forced);
776 /* Never wait if forced. */
777 if (!forced && module_refcount(mod) != 0)
778 wait_for_zero_refcount(mod);
780 mutex_unlock(&module_mutex);
781 /* Final destruction now noone is using it. */
782 if (mod->exit != NULL)
784 blocking_notifier_call_chain(&module_notify_list,
785 MODULE_STATE_GOING, mod);
786 mutex_lock(&module_mutex);
787 /* Store the name of the last unloaded module for diagnostic purposes */
788 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
792 mutex_unlock(&module_mutex);
796 static void print_unload_info(struct seq_file *m, struct module *mod)
798 struct module_use *use;
799 int printed_something = 0;
801 seq_printf(m, " %u ", module_refcount(mod));
803 /* Always include a trailing , so userspace can differentiate
804 between this and the old multi-field proc format. */
805 list_for_each_entry(use, &mod->modules_which_use_me, list) {
806 printed_something = 1;
807 seq_printf(m, "%s,", use->module_which_uses->name);
810 if (mod->init != NULL && mod->exit == NULL) {
811 printed_something = 1;
812 seq_printf(m, "[permanent],");
815 if (!printed_something)
819 void __symbol_put(const char *symbol)
821 struct module *owner;
824 if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false)))
829 EXPORT_SYMBOL(__symbol_put);
831 void symbol_put_addr(void *addr)
833 struct module *modaddr;
835 if (core_kernel_text((unsigned long)addr))
838 if (!(modaddr = module_text_address((unsigned long)addr)))
842 EXPORT_SYMBOL_GPL(symbol_put_addr);
844 static ssize_t show_refcnt(struct module_attribute *mattr,
845 struct module *mod, char *buffer)
847 return sprintf(buffer, "%u\n", module_refcount(mod));
850 static struct module_attribute refcnt = {
851 .attr = { .name = "refcnt", .mode = 0444 },
855 void module_put(struct module *module)
858 unsigned int cpu = get_cpu();
859 local_dec(&module->ref[cpu].count);
860 /* Maybe they're waiting for us to drop reference? */
861 if (unlikely(!module_is_live(module)))
862 wake_up_process(module->waiter);
866 EXPORT_SYMBOL(module_put);
868 #else /* !CONFIG_MODULE_UNLOAD */
869 static void print_unload_info(struct seq_file *m, struct module *mod)
871 /* We don't know the usage count, or what modules are using. */
872 seq_printf(m, " - -");
875 static inline void module_unload_free(struct module *mod)
879 static inline int use_module(struct module *a, struct module *b)
881 return strong_try_module_get(b) == 0;
884 static inline void module_unload_init(struct module *mod)
887 #endif /* CONFIG_MODULE_UNLOAD */
889 static ssize_t show_initstate(struct module_attribute *mattr,
890 struct module *mod, char *buffer)
892 const char *state = "unknown";
894 switch (mod->state) {
895 case MODULE_STATE_LIVE:
898 case MODULE_STATE_COMING:
901 case MODULE_STATE_GOING:
905 return sprintf(buffer, "%s\n", state);
908 static struct module_attribute initstate = {
909 .attr = { .name = "initstate", .mode = 0444 },
910 .show = show_initstate,
913 static struct module_attribute *modinfo_attrs[] = {
917 #ifdef CONFIG_MODULE_UNLOAD
923 static const char vermagic[] = VERMAGIC_STRING;
925 static int try_to_force_load(struct module *mod, const char *symname)
927 #ifdef CONFIG_MODULE_FORCE_LOAD
928 if (!(tainted & TAINT_FORCED_MODULE))
929 printk("%s: no version for \"%s\" found: kernel tainted.\n",
931 add_taint_module(mod, TAINT_FORCED_MODULE);
938 #ifdef CONFIG_MODVERSIONS
939 static int check_version(Elf_Shdr *sechdrs,
940 unsigned int versindex,
943 const unsigned long *crc)
945 unsigned int i, num_versions;
946 struct modversion_info *versions;
948 /* Exporting module didn't supply crcs? OK, we're already tainted. */
952 /* No versions at all? modprobe --force does this. */
954 return try_to_force_load(mod, symname) == 0;
956 versions = (void *) sechdrs[versindex].sh_addr;
957 num_versions = sechdrs[versindex].sh_size
958 / sizeof(struct modversion_info);
960 for (i = 0; i < num_versions; i++) {
961 if (strcmp(versions[i].name, symname) != 0)
964 if (versions[i].crc == *crc)
966 DEBUGP("Found checksum %lX vs module %lX\n",
967 *crc, versions[i].crc);
971 printk(KERN_WARNING "%s: no symbol version for %s\n",
976 printk("%s: disagrees about version of symbol %s\n",
981 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
982 unsigned int versindex,
985 const unsigned long *crc;
987 if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false)))
989 return check_version(sechdrs, versindex, "struct_module", mod, crc);
992 /* First part is kernel version, which we ignore if module has crcs. */
993 static inline int same_magic(const char *amagic, const char *bmagic,
997 amagic += strcspn(amagic, " ");
998 bmagic += strcspn(bmagic, " ");
1000 return strcmp(amagic, bmagic) == 0;
1003 static inline int check_version(Elf_Shdr *sechdrs,
1004 unsigned int versindex,
1005 const char *symname,
1007 const unsigned long *crc)
1012 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1013 unsigned int versindex,
1019 static inline int same_magic(const char *amagic, const char *bmagic,
1022 return strcmp(amagic, bmagic) == 0;
1024 #endif /* CONFIG_MODVERSIONS */
1026 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1027 Must be holding module_mutex. */
1028 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
1029 unsigned int versindex,
1033 struct module *owner;
1035 const unsigned long *crc;
1037 ret = find_symbol(name, &owner, &crc,
1038 !(mod->taints & TAINT_PROPRIETARY_MODULE), true);
1039 if (!IS_ERR_VALUE(ret)) {
1040 /* use_module can fail due to OOM,
1041 or module initialization or unloading */
1042 if (!check_version(sechdrs, versindex, name, mod, crc) ||
1043 !use_module(mod, owner))
1050 * /sys/module/foo/sections stuff
1051 * J. Corbet <corbet@lwn.net>
1053 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1054 struct module_sect_attr
1056 struct module_attribute mattr;
1058 unsigned long address;
1061 struct module_sect_attrs
1063 struct attribute_group grp;
1064 unsigned int nsections;
1065 struct module_sect_attr attrs[0];
1068 static ssize_t module_sect_show(struct module_attribute *mattr,
1069 struct module *mod, char *buf)
1071 struct module_sect_attr *sattr =
1072 container_of(mattr, struct module_sect_attr, mattr);
1073 return sprintf(buf, "0x%lx\n", sattr->address);
1076 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1078 unsigned int section;
1080 for (section = 0; section < sect_attrs->nsections; section++)
1081 kfree(sect_attrs->attrs[section].name);
1085 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1086 char *secstrings, Elf_Shdr *sechdrs)
1088 unsigned int nloaded = 0, i, size[2];
1089 struct module_sect_attrs *sect_attrs;
1090 struct module_sect_attr *sattr;
1091 struct attribute **gattr;
1093 /* Count loaded sections and allocate structures */
1094 for (i = 0; i < nsect; i++)
1095 if (sechdrs[i].sh_flags & SHF_ALLOC)
1097 size[0] = ALIGN(sizeof(*sect_attrs)
1098 + nloaded * sizeof(sect_attrs->attrs[0]),
1099 sizeof(sect_attrs->grp.attrs[0]));
1100 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1101 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1102 if (sect_attrs == NULL)
1105 /* Setup section attributes. */
1106 sect_attrs->grp.name = "sections";
1107 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1109 sect_attrs->nsections = 0;
1110 sattr = §_attrs->attrs[0];
1111 gattr = §_attrs->grp.attrs[0];
1112 for (i = 0; i < nsect; i++) {
1113 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1115 sattr->address = sechdrs[i].sh_addr;
1116 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1118 if (sattr->name == NULL)
1120 sect_attrs->nsections++;
1121 sattr->mattr.show = module_sect_show;
1122 sattr->mattr.store = NULL;
1123 sattr->mattr.attr.name = sattr->name;
1124 sattr->mattr.attr.mode = S_IRUGO;
1125 *(gattr++) = &(sattr++)->mattr.attr;
1129 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1132 mod->sect_attrs = sect_attrs;
1135 free_sect_attrs(sect_attrs);
1138 static void remove_sect_attrs(struct module *mod)
1140 if (mod->sect_attrs) {
1141 sysfs_remove_group(&mod->mkobj.kobj,
1142 &mod->sect_attrs->grp);
1143 /* We are positive that no one is using any sect attrs
1144 * at this point. Deallocate immediately. */
1145 free_sect_attrs(mod->sect_attrs);
1146 mod->sect_attrs = NULL;
1151 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1154 struct module_notes_attrs {
1155 struct kobject *dir;
1157 struct bin_attribute attrs[0];
1160 static ssize_t module_notes_read(struct kobject *kobj,
1161 struct bin_attribute *bin_attr,
1162 char *buf, loff_t pos, size_t count)
1165 * The caller checked the pos and count against our size.
1167 memcpy(buf, bin_attr->private + pos, count);
1171 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1174 if (notes_attrs->dir) {
1176 sysfs_remove_bin_file(notes_attrs->dir,
1177 ¬es_attrs->attrs[i]);
1178 kobject_del(notes_attrs->dir);
1183 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1184 char *secstrings, Elf_Shdr *sechdrs)
1186 unsigned int notes, loaded, i;
1187 struct module_notes_attrs *notes_attrs;
1188 struct bin_attribute *nattr;
1190 /* Count notes sections and allocate structures. */
1192 for (i = 0; i < nsect; i++)
1193 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1194 (sechdrs[i].sh_type == SHT_NOTE))
1200 notes_attrs = kzalloc(sizeof(*notes_attrs)
1201 + notes * sizeof(notes_attrs->attrs[0]),
1203 if (notes_attrs == NULL)
1206 notes_attrs->notes = notes;
1207 nattr = ¬es_attrs->attrs[0];
1208 for (loaded = i = 0; i < nsect; ++i) {
1209 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1211 if (sechdrs[i].sh_type == SHT_NOTE) {
1212 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1213 nattr->attr.mode = S_IRUGO;
1214 nattr->size = sechdrs[i].sh_size;
1215 nattr->private = (void *) sechdrs[i].sh_addr;
1216 nattr->read = module_notes_read;
1222 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1223 if (!notes_attrs->dir)
1226 for (i = 0; i < notes; ++i)
1227 if (sysfs_create_bin_file(notes_attrs->dir,
1228 ¬es_attrs->attrs[i]))
1231 mod->notes_attrs = notes_attrs;
1235 free_notes_attrs(notes_attrs, i);
1238 static void remove_notes_attrs(struct module *mod)
1240 if (mod->notes_attrs)
1241 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1246 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1247 char *sectstrings, Elf_Shdr *sechdrs)
1251 static inline void remove_sect_attrs(struct module *mod)
1255 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1256 char *sectstrings, Elf_Shdr *sechdrs)
1260 static inline void remove_notes_attrs(struct module *mod)
1266 int module_add_modinfo_attrs(struct module *mod)
1268 struct module_attribute *attr;
1269 struct module_attribute *temp_attr;
1273 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1274 (ARRAY_SIZE(modinfo_attrs) + 1)),
1276 if (!mod->modinfo_attrs)
1279 temp_attr = mod->modinfo_attrs;
1280 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1282 (attr->test && attr->test(mod))) {
1283 memcpy(temp_attr, attr, sizeof(*temp_attr));
1284 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1291 void module_remove_modinfo_attrs(struct module *mod)
1293 struct module_attribute *attr;
1296 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1297 /* pick a field to test for end of list */
1298 if (!attr->attr.name)
1300 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1304 kfree(mod->modinfo_attrs);
1307 int mod_sysfs_init(struct module *mod)
1310 struct kobject *kobj;
1312 if (!module_sysfs_initialized) {
1313 printk(KERN_ERR "%s: module sysfs not initialized\n",
1319 kobj = kset_find_obj(module_kset, mod->name);
1321 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1327 mod->mkobj.mod = mod;
1329 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1330 mod->mkobj.kobj.kset = module_kset;
1331 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1334 kobject_put(&mod->mkobj.kobj);
1336 /* delay uevent until full sysfs population */
1341 int mod_sysfs_setup(struct module *mod,
1342 struct kernel_param *kparam,
1343 unsigned int num_params)
1347 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1348 if (!mod->holders_dir) {
1353 err = module_param_sysfs_setup(mod, kparam, num_params);
1355 goto out_unreg_holders;
1357 err = module_add_modinfo_attrs(mod);
1359 goto out_unreg_param;
1361 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1365 module_param_sysfs_remove(mod);
1367 kobject_put(mod->holders_dir);
1369 kobject_put(&mod->mkobj.kobj);
1373 static void mod_sysfs_fini(struct module *mod)
1375 kobject_put(&mod->mkobj.kobj);
1378 #else /* CONFIG_SYSFS */
1380 static void mod_sysfs_fini(struct module *mod)
1384 #endif /* CONFIG_SYSFS */
1386 static void mod_kobject_remove(struct module *mod)
1388 module_remove_modinfo_attrs(mod);
1389 module_param_sysfs_remove(mod);
1390 kobject_put(mod->mkobj.drivers_dir);
1391 kobject_put(mod->holders_dir);
1392 mod_sysfs_fini(mod);
1396 * link the module with the whole machine is stopped with interrupts off
1397 * - this defends against kallsyms not taking locks
1399 static int __link_module(void *_mod)
1401 struct module *mod = _mod;
1402 list_add(&mod->list, &modules);
1407 * unlink the module with the whole machine is stopped with interrupts off
1408 * - this defends against kallsyms not taking locks
1410 static int __unlink_module(void *_mod)
1412 struct module *mod = _mod;
1413 list_del(&mod->list);
1417 /* Free a module, remove from lists, etc (must hold module_mutex). */
1418 static void free_module(struct module *mod)
1420 /* Delete from various lists */
1421 stop_machine(__unlink_module, mod, NULL);
1422 remove_notes_attrs(mod);
1423 remove_sect_attrs(mod);
1424 mod_kobject_remove(mod);
1426 unwind_remove_table(mod->unwind_info, 0);
1428 /* Arch-specific cleanup. */
1429 module_arch_cleanup(mod);
1431 /* Module unload stuff */
1432 module_unload_free(mod);
1434 /* release any pointers to mcount in this module */
1435 ftrace_release(mod->module_core, mod->core_size);
1437 /* This may be NULL, but that's OK */
1438 module_free(mod, mod->module_init);
1441 percpu_modfree(mod->percpu);
1443 /* Free lock-classes: */
1444 lockdep_free_key_range(mod->module_core, mod->core_size);
1446 /* Finally, free the core (containing the module structure) */
1447 module_free(mod, mod->module_core);
1450 void *__symbol_get(const char *symbol)
1452 struct module *owner;
1453 unsigned long value;
1456 value = find_symbol(symbol, &owner, NULL, true, true);
1457 if (IS_ERR_VALUE(value))
1459 else if (strong_try_module_get(owner))
1463 return (void *)value;
1465 EXPORT_SYMBOL_GPL(__symbol_get);
1468 * Ensure that an exported symbol [global namespace] does not already exist
1469 * in the kernel or in some other module's exported symbol table.
1471 static int verify_export_symbols(struct module *mod)
1474 struct module *owner;
1475 const struct kernel_symbol *s;
1477 const struct kernel_symbol *sym;
1480 { mod->syms, mod->num_syms },
1481 { mod->gpl_syms, mod->num_gpl_syms },
1482 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1483 #ifdef CONFIG_UNUSED_SYMBOLS
1484 { mod->unused_syms, mod->num_unused_syms },
1485 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1489 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1490 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1491 if (!IS_ERR_VALUE(find_symbol(s->name, &owner,
1492 NULL, true, false))) {
1494 "%s: exports duplicate symbol %s"
1496 mod->name, s->name, module_name(owner));
1504 /* Change all symbols so that st_value encodes the pointer directly. */
1505 static int simplify_symbols(Elf_Shdr *sechdrs,
1506 unsigned int symindex,
1508 unsigned int versindex,
1509 unsigned int pcpuindex,
1512 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1513 unsigned long secbase;
1514 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1517 for (i = 1; i < n; i++) {
1518 switch (sym[i].st_shndx) {
1520 /* We compiled with -fno-common. These are not
1521 supposed to happen. */
1522 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1523 printk("%s: please compile with -fno-common\n",
1529 /* Don't need to do anything */
1530 DEBUGP("Absolute symbol: 0x%08lx\n",
1531 (long)sym[i].st_value);
1536 = resolve_symbol(sechdrs, versindex,
1537 strtab + sym[i].st_name, mod);
1539 /* Ok if resolved. */
1540 if (!IS_ERR_VALUE(sym[i].st_value))
1543 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1546 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1547 mod->name, strtab + sym[i].st_name);
1552 /* Divert to percpu allocation if a percpu var. */
1553 if (sym[i].st_shndx == pcpuindex)
1554 secbase = (unsigned long)mod->percpu;
1556 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1557 sym[i].st_value += secbase;
1565 /* Update size with this section: return offset. */
1566 static long get_offset(unsigned int *size, Elf_Shdr *sechdr)
1570 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1571 *size = ret + sechdr->sh_size;
1575 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1576 might -- code, read-only data, read-write data, small data. Tally
1577 sizes, and place the offsets into sh_entsize fields: high bit means it
1579 static void layout_sections(struct module *mod,
1580 const Elf_Ehdr *hdr,
1582 const char *secstrings)
1584 static unsigned long const masks[][2] = {
1585 /* NOTE: all executable code must be the first section
1586 * in this array; otherwise modify the text_size
1587 * finder in the two loops below */
1588 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1589 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1590 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1591 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1595 for (i = 0; i < hdr->e_shnum; i++)
1596 sechdrs[i].sh_entsize = ~0UL;
1598 DEBUGP("Core section allocation order:\n");
1599 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1600 for (i = 0; i < hdr->e_shnum; ++i) {
1601 Elf_Shdr *s = &sechdrs[i];
1603 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1604 || (s->sh_flags & masks[m][1])
1605 || s->sh_entsize != ~0UL
1606 || strncmp(secstrings + s->sh_name,
1609 s->sh_entsize = get_offset(&mod->core_size, s);
1610 DEBUGP("\t%s\n", secstrings + s->sh_name);
1613 mod->core_text_size = mod->core_size;
1616 DEBUGP("Init section allocation order:\n");
1617 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1618 for (i = 0; i < hdr->e_shnum; ++i) {
1619 Elf_Shdr *s = &sechdrs[i];
1621 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1622 || (s->sh_flags & masks[m][1])
1623 || s->sh_entsize != ~0UL
1624 || strncmp(secstrings + s->sh_name,
1627 s->sh_entsize = (get_offset(&mod->init_size, s)
1628 | INIT_OFFSET_MASK);
1629 DEBUGP("\t%s\n", secstrings + s->sh_name);
1632 mod->init_text_size = mod->init_size;
1636 static void set_license(struct module *mod, const char *license)
1639 license = "unspecified";
1641 if (!license_is_gpl_compatible(license)) {
1642 if (!(tainted & TAINT_PROPRIETARY_MODULE))
1643 printk(KERN_WARNING "%s: module license '%s' taints "
1644 "kernel.\n", mod->name, license);
1645 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1649 /* Parse tag=value strings from .modinfo section */
1650 static char *next_string(char *string, unsigned long *secsize)
1652 /* Skip non-zero chars */
1655 if ((*secsize)-- <= 1)
1659 /* Skip any zero padding. */
1660 while (!string[0]) {
1662 if ((*secsize)-- <= 1)
1668 static char *get_modinfo(Elf_Shdr *sechdrs,
1673 unsigned int taglen = strlen(tag);
1674 unsigned long size = sechdrs[info].sh_size;
1676 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1677 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1678 return p + taglen + 1;
1683 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1684 unsigned int infoindex)
1686 struct module_attribute *attr;
1689 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1692 get_modinfo(sechdrs,
1698 #ifdef CONFIG_KALLSYMS
1700 /* lookup symbol in given range of kernel_symbols */
1701 static const struct kernel_symbol *lookup_symbol(const char *name,
1702 const struct kernel_symbol *start,
1703 const struct kernel_symbol *stop)
1705 const struct kernel_symbol *ks = start;
1706 for (; ks < stop; ks++)
1707 if (strcmp(ks->name, name) == 0)
1712 static int is_exported(const char *name, const struct module *mod)
1714 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1717 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
1724 static char elf_type(const Elf_Sym *sym,
1726 const char *secstrings,
1729 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1730 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1735 if (sym->st_shndx == SHN_UNDEF)
1737 if (sym->st_shndx == SHN_ABS)
1739 if (sym->st_shndx >= SHN_LORESERVE)
1741 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1743 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1744 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1745 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1747 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1752 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1753 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1758 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1759 ".debug", strlen(".debug")) == 0)
1764 static void add_kallsyms(struct module *mod,
1766 unsigned int symindex,
1767 unsigned int strindex,
1768 const char *secstrings)
1772 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1773 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1774 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1776 /* Set types up while we still have access to sections. */
1777 for (i = 0; i < mod->num_symtab; i++)
1778 mod->symtab[i].st_info
1779 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1782 static inline void add_kallsyms(struct module *mod,
1784 unsigned int symindex,
1785 unsigned int strindex,
1786 const char *secstrings)
1789 #endif /* CONFIG_KALLSYMS */
1791 static void *module_alloc_update_bounds(unsigned long size)
1793 void *ret = module_alloc(size);
1796 /* Update module bounds. */
1797 if ((unsigned long)ret < module_addr_min)
1798 module_addr_min = (unsigned long)ret;
1799 if ((unsigned long)ret + size > module_addr_max)
1800 module_addr_max = (unsigned long)ret + size;
1805 /* Allocate and load the module: note that size of section 0 is always
1806 zero, and we rely on this for optional sections. */
1807 static noinline struct module *load_module(void __user *umod,
1809 const char __user *uargs)
1813 char *secstrings, *args, *modmagic, *strtab = NULL;
1815 unsigned int symindex = 0;
1816 unsigned int strindex = 0;
1817 unsigned int setupindex;
1818 unsigned int exindex;
1819 unsigned int exportindex;
1820 unsigned int modindex;
1821 unsigned int obsparmindex;
1822 unsigned int infoindex;
1823 unsigned int gplindex;
1824 unsigned int crcindex;
1825 unsigned int gplcrcindex;
1826 unsigned int versindex;
1827 unsigned int pcpuindex;
1828 unsigned int gplfutureindex;
1829 unsigned int gplfuturecrcindex;
1830 unsigned int unwindex = 0;
1831 #ifdef CONFIG_UNUSED_SYMBOLS
1832 unsigned int unusedindex;
1833 unsigned int unusedcrcindex;
1834 unsigned int unusedgplindex;
1835 unsigned int unusedgplcrcindex;
1837 unsigned int markersindex;
1838 unsigned int markersstringsindex;
1839 unsigned int tracepointsindex;
1840 unsigned int tracepointsstringsindex;
1841 unsigned int mcountindex;
1844 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1846 struct exception_table_entry *extable;
1847 mm_segment_t old_fs;
1849 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1851 if (len < sizeof(*hdr))
1852 return ERR_PTR(-ENOEXEC);
1854 /* Suck in entire file: we'll want most of it. */
1855 /* vmalloc barfs on "unusual" numbers. Check here */
1856 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1857 return ERR_PTR(-ENOMEM);
1858 if (copy_from_user(hdr, umod, len) != 0) {
1863 /* Sanity checks against insmoding binaries or wrong arch,
1864 weird elf version */
1865 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1866 || hdr->e_type != ET_REL
1867 || !elf_check_arch(hdr)
1868 || hdr->e_shentsize != sizeof(*sechdrs)) {
1873 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1876 /* Convenience variables */
1877 sechdrs = (void *)hdr + hdr->e_shoff;
1878 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1879 sechdrs[0].sh_addr = 0;
1881 for (i = 1; i < hdr->e_shnum; i++) {
1882 if (sechdrs[i].sh_type != SHT_NOBITS
1883 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1886 /* Mark all sections sh_addr with their address in the
1888 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1890 /* Internal symbols and strings. */
1891 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1893 strindex = sechdrs[i].sh_link;
1894 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1896 #ifndef CONFIG_MODULE_UNLOAD
1897 /* Don't load .exit sections */
1898 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1899 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1903 modindex = find_sec(hdr, sechdrs, secstrings,
1904 ".gnu.linkonce.this_module");
1906 printk(KERN_WARNING "No module found in object\n");
1910 mod = (void *)sechdrs[modindex].sh_addr;
1912 if (symindex == 0) {
1913 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1919 /* Optional sections */
1920 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1921 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1922 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
1923 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1924 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1925 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
1926 #ifdef CONFIG_UNUSED_SYMBOLS
1927 unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
1928 unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
1929 unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
1930 unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
1932 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1933 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1934 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1935 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1936 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1937 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1938 #ifdef ARCH_UNWIND_SECTION_NAME
1939 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1942 /* Don't keep modinfo and version sections. */
1943 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1944 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1945 #ifdef CONFIG_KALLSYMS
1946 /* Keep symbol and string tables for decoding later. */
1947 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1948 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1951 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
1953 /* Check module struct version now, before we try to use module. */
1954 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1959 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1960 /* This is allowed: modprobe --force will invalidate it. */
1962 err = try_to_force_load(mod, "magic");
1965 } else if (!same_magic(modmagic, vermagic, versindex)) {
1966 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1967 mod->name, modmagic, vermagic);
1972 /* Now copy in args */
1973 args = strndup_user(uargs, ~0UL >> 1);
1975 err = PTR_ERR(args);
1979 if (find_module(mod->name)) {
1984 mod->state = MODULE_STATE_COMING;
1986 /* Allow arches to frob section contents and sizes. */
1987 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1992 /* We have a special allocation for this section. */
1993 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1994 sechdrs[pcpuindex].sh_addralign,
2000 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2001 mod->percpu = percpu;
2004 /* Determine total sizes, and put offsets in sh_entsize. For now
2005 this is done generically; there doesn't appear to be any
2006 special cases for the architectures. */
2007 layout_sections(mod, hdr, sechdrs, secstrings);
2009 /* Do the allocs. */
2010 ptr = module_alloc_update_bounds(mod->core_size);
2015 memset(ptr, 0, mod->core_size);
2016 mod->module_core = ptr;
2018 ptr = module_alloc_update_bounds(mod->init_size);
2019 if (!ptr && mod->init_size) {
2023 memset(ptr, 0, mod->init_size);
2024 mod->module_init = ptr;
2026 /* Transfer each section which specifies SHF_ALLOC */
2027 DEBUGP("final section addresses:\n");
2028 for (i = 0; i < hdr->e_shnum; i++) {
2031 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2034 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2035 dest = mod->module_init
2036 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2038 dest = mod->module_core + sechdrs[i].sh_entsize;
2040 if (sechdrs[i].sh_type != SHT_NOBITS)
2041 memcpy(dest, (void *)sechdrs[i].sh_addr,
2042 sechdrs[i].sh_size);
2043 /* Update sh_addr to point to copy in image. */
2044 sechdrs[i].sh_addr = (unsigned long)dest;
2045 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2047 /* Module has been moved. */
2048 mod = (void *)sechdrs[modindex].sh_addr;
2050 /* Now we've moved module, initialize linked lists, etc. */
2051 module_unload_init(mod);
2053 /* add kobject, so we can reference it. */
2054 err = mod_sysfs_init(mod);
2058 /* Set up license info based on the info section */
2059 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2062 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2063 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2064 * using GPL-only symbols it needs.
2066 if (strcmp(mod->name, "ndiswrapper") == 0)
2067 add_taint(TAINT_PROPRIETARY_MODULE);
2069 /* driverloader was caught wrongly pretending to be under GPL */
2070 if (strcmp(mod->name, "driverloader") == 0)
2071 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2073 /* Set up MODINFO_ATTR fields */
2074 setup_modinfo(mod, sechdrs, infoindex);
2076 /* Fix up syms, so that st_value is a pointer to location. */
2077 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2082 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
2083 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
2084 mod->syms = (void *)sechdrs[exportindex].sh_addr;
2086 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
2087 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
2088 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
2090 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
2091 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
2092 sizeof(*mod->gpl_future_syms);
2093 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
2094 if (gplfuturecrcindex)
2095 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
2097 #ifdef CONFIG_UNUSED_SYMBOLS
2098 mod->num_unused_syms = sechdrs[unusedindex].sh_size /
2099 sizeof(*mod->unused_syms);
2100 mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
2101 sizeof(*mod->unused_gpl_syms);
2102 mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
2104 mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
2105 mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
2106 if (unusedgplcrcindex)
2107 mod->unused_gpl_crcs
2108 = (void *)sechdrs[unusedgplcrcindex].sh_addr;
2111 #ifdef CONFIG_MODVERSIONS
2112 if ((mod->num_syms && !crcindex)
2113 || (mod->num_gpl_syms && !gplcrcindex)
2114 || (mod->num_gpl_future_syms && !gplfuturecrcindex)
2115 #ifdef CONFIG_UNUSED_SYMBOLS
2116 || (mod->num_unused_syms && !unusedcrcindex)
2117 || (mod->num_unused_gpl_syms && !unusedgplcrcindex)
2120 printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name);
2121 err = try_to_force_load(mod, "nocrc");
2126 markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
2127 markersstringsindex = find_sec(hdr, sechdrs, secstrings,
2128 "__markers_strings");
2129 tracepointsindex = find_sec(hdr, sechdrs, secstrings, "__tracepoints");
2130 tracepointsstringsindex = find_sec(hdr, sechdrs, secstrings,
2131 "__tracepoints_strings");
2133 mcountindex = find_sec(hdr, sechdrs, secstrings,
2136 /* Now do relocations. */
2137 for (i = 1; i < hdr->e_shnum; i++) {
2138 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2139 unsigned int info = sechdrs[i].sh_info;
2141 /* Not a valid relocation section? */
2142 if (info >= hdr->e_shnum)
2145 /* Don't bother with non-allocated sections */
2146 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2149 if (sechdrs[i].sh_type == SHT_REL)
2150 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2151 else if (sechdrs[i].sh_type == SHT_RELA)
2152 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2157 #ifdef CONFIG_MARKERS
2158 mod->markers = (void *)sechdrs[markersindex].sh_addr;
2160 sechdrs[markersindex].sh_size / sizeof(*mod->markers);
2162 #ifdef CONFIG_TRACEPOINTS
2163 mod->tracepoints = (void *)sechdrs[tracepointsindex].sh_addr;
2164 mod->num_tracepoints =
2165 sechdrs[tracepointsindex].sh_size / sizeof(*mod->tracepoints);
2169 /* Find duplicate symbols */
2170 err = verify_export_symbols(mod);
2175 /* Set up and sort exception table */
2176 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
2177 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
2178 sort_extable(extable, extable + mod->num_exentries);
2180 /* Finally, copy percpu area over. */
2181 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2182 sechdrs[pcpuindex].sh_size);
2184 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
2187 #ifdef CONFIG_MARKERS
2188 marker_update_probe_range(mod->markers,
2189 mod->markers + mod->num_markers);
2191 #ifdef CONFIG_TRACEPOINTS
2192 tracepoint_update_probe_range(mod->tracepoints,
2193 mod->tracepoints + mod->num_tracepoints);
2197 /* sechdrs[0].sh_size is always zero */
2198 mseg = (void *)sechdrs[mcountindex].sh_addr;
2199 ftrace_init_module(mseg, mseg + sechdrs[mcountindex].sh_size);
2201 err = module_finalize(hdr, sechdrs, mod);
2205 /* flush the icache in correct context */
2210 * Flush the instruction cache, since we've played with text.
2211 * Do it before processing of module parameters, so the module
2212 * can provide parameter accessor functions of its own.
2214 if (mod->module_init)
2215 flush_icache_range((unsigned long)mod->module_init,
2216 (unsigned long)mod->module_init
2218 flush_icache_range((unsigned long)mod->module_core,
2219 (unsigned long)mod->module_core + mod->core_size);
2225 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2228 /* Now sew it into the lists so we can get lockdep and oops
2229 * info during argument parsing. Noone should access us, since
2230 * strong_try_module_get() will fail. */
2231 stop_machine(__link_module, mod, NULL);
2233 /* Size of section 0 is 0, so this works well if no params */
2234 err = parse_args(mod->name, mod->args,
2235 (struct kernel_param *)
2236 sechdrs[setupindex].sh_addr,
2237 sechdrs[setupindex].sh_size
2238 / sizeof(struct kernel_param),
2243 err = mod_sysfs_setup(mod,
2244 (struct kernel_param *)
2245 sechdrs[setupindex].sh_addr,
2246 sechdrs[setupindex].sh_size
2247 / sizeof(struct kernel_param));
2250 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2251 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2253 /* Size of section 0 is 0, so this works well if no unwind info. */
2254 mod->unwind_info = unwind_add_table(mod,
2255 (void *)sechdrs[unwindex].sh_addr,
2256 sechdrs[unwindex].sh_size);
2258 /* Get rid of temporary copy */
2265 stop_machine(__unlink_module, mod, NULL);
2266 module_arch_cleanup(mod);
2268 kobject_del(&mod->mkobj.kobj);
2269 kobject_put(&mod->mkobj.kobj);
2270 ftrace_release(mod->module_core, mod->core_size);
2272 module_unload_free(mod);
2273 module_free(mod, mod->module_init);
2275 module_free(mod, mod->module_core);
2278 percpu_modfree(percpu);
2283 return ERR_PTR(err);
2286 printk(KERN_ERR "Module len %lu truncated\n", len);
2291 /* This is where the real work happens */
2293 sys_init_module(void __user *umod,
2295 const char __user *uargs)
2300 /* Must have permission */
2301 if (!capable(CAP_SYS_MODULE))
2304 /* Only one module load at a time, please */
2305 if (mutex_lock_interruptible(&module_mutex) != 0)
2308 /* Do all the hard work */
2309 mod = load_module(umod, len, uargs);
2311 mutex_unlock(&module_mutex);
2312 return PTR_ERR(mod);
2315 /* Drop lock so they can recurse */
2316 mutex_unlock(&module_mutex);
2318 blocking_notifier_call_chain(&module_notify_list,
2319 MODULE_STATE_COMING, mod);
2321 /* Start the module */
2322 if (mod->init != NULL)
2323 ret = do_one_initcall(mod->init);
2325 /* Init routine failed: abort. Try to protect us from
2326 buggy refcounters. */
2327 mod->state = MODULE_STATE_GOING;
2328 synchronize_sched();
2330 blocking_notifier_call_chain(&module_notify_list,
2331 MODULE_STATE_GOING, mod);
2332 mutex_lock(&module_mutex);
2334 mutex_unlock(&module_mutex);
2335 wake_up(&module_wq);
2339 printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, "
2340 "it should follow 0/-E convention\n"
2341 KERN_WARNING "%s: loading module anyway...\n",
2342 __func__, mod->name, ret,
2347 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2348 mod->state = MODULE_STATE_LIVE;
2349 wake_up(&module_wq);
2351 mutex_lock(&module_mutex);
2352 /* Drop initial reference. */
2354 unwind_remove_table(mod->unwind_info, 1);
2355 module_free(mod, mod->module_init);
2356 mod->module_init = NULL;
2358 mod->init_text_size = 0;
2359 mutex_unlock(&module_mutex);
2364 static inline int within(unsigned long addr, void *start, unsigned long size)
2366 return ((void *)addr >= start && (void *)addr < start + size);
2369 #ifdef CONFIG_KALLSYMS
2371 * This ignores the intensely annoying "mapping symbols" found
2372 * in ARM ELF files: $a, $t and $d.
2374 static inline int is_arm_mapping_symbol(const char *str)
2376 return str[0] == '$' && strchr("atd", str[1])
2377 && (str[2] == '\0' || str[2] == '.');
2380 static const char *get_ksymbol(struct module *mod,
2382 unsigned long *size,
2383 unsigned long *offset)
2385 unsigned int i, best = 0;
2386 unsigned long nextval;
2388 /* At worse, next value is at end of module */
2389 if (within(addr, mod->module_init, mod->init_size))
2390 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2392 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2394 /* Scan for closest preceeding symbol, and next symbol. (ELF
2395 starts real symbols at 1). */
2396 for (i = 1; i < mod->num_symtab; i++) {
2397 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2400 /* We ignore unnamed symbols: they're uninformative
2401 * and inserted at a whim. */
2402 if (mod->symtab[i].st_value <= addr
2403 && mod->symtab[i].st_value > mod->symtab[best].st_value
2404 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2405 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2407 if (mod->symtab[i].st_value > addr
2408 && mod->symtab[i].st_value < nextval
2409 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2410 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2411 nextval = mod->symtab[i].st_value;
2418 *size = nextval - mod->symtab[best].st_value;
2420 *offset = addr - mod->symtab[best].st_value;
2421 return mod->strtab + mod->symtab[best].st_name;
2424 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2425 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2426 const char *module_address_lookup(unsigned long addr,
2427 unsigned long *size,
2428 unsigned long *offset,
2433 const char *ret = NULL;
2436 list_for_each_entry(mod, &modules, list) {
2437 if (within(addr, mod->module_init, mod->init_size)
2438 || within(addr, mod->module_core, mod->core_size)) {
2440 *modname = mod->name;
2441 ret = get_ksymbol(mod, addr, size, offset);
2445 /* Make a copy in here where it's safe */
2447 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2454 int lookup_module_symbol_name(unsigned long addr, char *symname)
2459 list_for_each_entry(mod, &modules, list) {
2460 if (within(addr, mod->module_init, mod->init_size) ||
2461 within(addr, mod->module_core, mod->core_size)) {
2464 sym = get_ksymbol(mod, addr, NULL, NULL);
2467 strlcpy(symname, sym, KSYM_NAME_LEN);
2477 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2478 unsigned long *offset, char *modname, char *name)
2483 list_for_each_entry(mod, &modules, list) {
2484 if (within(addr, mod->module_init, mod->init_size) ||
2485 within(addr, mod->module_core, mod->core_size)) {
2488 sym = get_ksymbol(mod, addr, size, offset);
2492 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2494 strlcpy(name, sym, KSYM_NAME_LEN);
2504 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2505 char *name, char *module_name, int *exported)
2510 list_for_each_entry(mod, &modules, list) {
2511 if (symnum < mod->num_symtab) {
2512 *value = mod->symtab[symnum].st_value;
2513 *type = mod->symtab[symnum].st_info;
2514 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2516 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2517 *exported = is_exported(name, mod);
2521 symnum -= mod->num_symtab;
2527 static unsigned long mod_find_symname(struct module *mod, const char *name)
2531 for (i = 0; i < mod->num_symtab; i++)
2532 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2533 mod->symtab[i].st_info != 'U')
2534 return mod->symtab[i].st_value;
2538 /* Look for this name: can be of form module:name. */
2539 unsigned long module_kallsyms_lookup_name(const char *name)
2543 unsigned long ret = 0;
2545 /* Don't lock: we're in enough trouble already. */
2547 if ((colon = strchr(name, ':')) != NULL) {
2549 if ((mod = find_module(name)) != NULL)
2550 ret = mod_find_symname(mod, colon+1);
2553 list_for_each_entry(mod, &modules, list)
2554 if ((ret = mod_find_symname(mod, name)) != 0)
2560 #endif /* CONFIG_KALLSYMS */
2562 /* Called by the /proc file system to return a list of modules. */
2563 static void *m_start(struct seq_file *m, loff_t *pos)
2565 mutex_lock(&module_mutex);
2566 return seq_list_start(&modules, *pos);
2569 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2571 return seq_list_next(p, &modules, pos);
2574 static void m_stop(struct seq_file *m, void *p)
2576 mutex_unlock(&module_mutex);
2579 static char *module_flags(struct module *mod, char *buf)
2584 mod->state == MODULE_STATE_GOING ||
2585 mod->state == MODULE_STATE_COMING) {
2587 if (mod->taints & TAINT_PROPRIETARY_MODULE)
2589 if (mod->taints & TAINT_FORCED_MODULE)
2592 * TAINT_FORCED_RMMOD: could be added.
2593 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2597 /* Show a - for module-is-being-unloaded */
2598 if (mod->state == MODULE_STATE_GOING)
2600 /* Show a + for module-is-being-loaded */
2601 if (mod->state == MODULE_STATE_COMING)
2610 static int m_show(struct seq_file *m, void *p)
2612 struct module *mod = list_entry(p, struct module, list);
2615 seq_printf(m, "%s %u",
2616 mod->name, mod->init_size + mod->core_size);
2617 print_unload_info(m, mod);
2619 /* Informative for users. */
2620 seq_printf(m, " %s",
2621 mod->state == MODULE_STATE_GOING ? "Unloading":
2622 mod->state == MODULE_STATE_COMING ? "Loading":
2624 /* Used by oprofile and other similar tools. */
2625 seq_printf(m, " 0x%p", mod->module_core);
2629 seq_printf(m, " %s", module_flags(mod, buf));
2631 seq_printf(m, "\n");
2635 /* Format: modulename size refcount deps address
2637 Where refcount is a number or -, and deps is a comma-separated list
2640 const struct seq_operations modules_op = {
2647 /* Given an address, look for it in the module exception tables. */
2648 const struct exception_table_entry *search_module_extables(unsigned long addr)
2650 const struct exception_table_entry *e = NULL;
2654 list_for_each_entry(mod, &modules, list) {
2655 if (mod->num_exentries == 0)
2658 e = search_extable(mod->extable,
2659 mod->extable + mod->num_exentries - 1,
2666 /* Now, if we found one, we are running inside it now, hence
2667 we cannot unload the module, hence no refcnt needed. */
2672 * Is this a valid module address?
2674 int is_module_address(unsigned long addr)
2680 list_for_each_entry(mod, &modules, list) {
2681 if (within(addr, mod->module_core, mod->core_size)) {
2693 /* Is this a valid kernel address? */
2694 struct module *__module_text_address(unsigned long addr)
2698 if (addr < module_addr_min || addr > module_addr_max)
2701 list_for_each_entry(mod, &modules, list)
2702 if (within(addr, mod->module_init, mod->init_text_size)
2703 || within(addr, mod->module_core, mod->core_text_size))
2708 struct module *module_text_address(unsigned long addr)
2713 mod = __module_text_address(addr);
2719 /* Don't grab lock, we're oopsing. */
2720 void print_modules(void)
2725 printk("Modules linked in:");
2726 list_for_each_entry(mod, &modules, list)
2727 printk(" %s%s", mod->name, module_flags(mod, buf));
2728 if (last_unloaded_module[0])
2729 printk(" [last unloaded: %s]", last_unloaded_module);
2733 #ifdef CONFIG_MODVERSIONS
2734 /* Generate the signature for struct module here, too, for modversions. */
2735 void struct_module(struct module *mod) { return; }
2736 EXPORT_SYMBOL(struct_module);
2739 #ifdef CONFIG_MARKERS
2740 void module_update_markers(void)
2744 mutex_lock(&module_mutex);
2745 list_for_each_entry(mod, &modules, list)
2747 marker_update_probe_range(mod->markers,
2748 mod->markers + mod->num_markers);
2749 mutex_unlock(&module_mutex);
2753 #ifdef CONFIG_TRACEPOINTS
2754 void module_update_tracepoints(void)
2758 mutex_lock(&module_mutex);
2759 list_for_each_entry(mod, &modules, list)
2761 tracepoint_update_probe_range(mod->tracepoints,
2762 mod->tracepoints + mod->num_tracepoints);
2763 mutex_unlock(&module_mutex);
2767 * Returns 0 if current not found.
2768 * Returns 1 if current found.
2770 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2772 struct module *iter_mod;
2775 mutex_lock(&module_mutex);
2776 list_for_each_entry(iter_mod, &modules, list) {
2777 if (!iter_mod->taints) {
2779 * Sorted module list
2781 if (iter_mod < iter->module)
2783 else if (iter_mod > iter->module)
2784 iter->tracepoint = NULL;
2785 found = tracepoint_get_iter_range(&iter->tracepoint,
2786 iter_mod->tracepoints,
2787 iter_mod->tracepoints
2788 + iter_mod->num_tracepoints);
2790 iter->module = iter_mod;
2795 mutex_unlock(&module_mutex);