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/ftrace_event.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
25 #include <linux/sysfs.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/elf.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/syscalls.h>
33 #include <linux/fcntl.h>
34 #include <linux/rcupdate.h>
35 #include <linux/capability.h>
36 #include <linux/cpu.h>
37 #include <linux/moduleparam.h>
38 #include <linux/errno.h>
39 #include <linux/err.h>
40 #include <linux/vermagic.h>
41 #include <linux/notifier.h>
42 #include <linux/sched.h>
43 #include <linux/stop_machine.h>
44 #include <linux/device.h>
45 #include <linux/string.h>
46 #include <linux/mutex.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <asm/mmu_context.h>
51 #include <linux/license.h>
52 #include <asm/sections.h>
53 #include <linux/tracepoint.h>
54 #include <linux/ftrace.h>
55 #include <linux/async.h>
56 #include <linux/percpu.h>
57 #include <linux/kmemleak.h>
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/module.h>
62 EXPORT_TRACEPOINT_SYMBOL(module_get);
67 #define DEBUGP(fmt , a...)
70 #ifndef ARCH_SHF_SMALL
71 #define ARCH_SHF_SMALL 0
74 /* If this is set, the section belongs in the init part of the module */
75 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
77 /* List of modules, protected by module_mutex or preempt_disable
78 * (delete uses stop_machine/add uses RCU list operations). */
79 DEFINE_MUTEX(module_mutex);
80 EXPORT_SYMBOL_GPL(module_mutex);
81 static LIST_HEAD(modules);
83 /* Block module loading/unloading? */
84 int modules_disabled = 0;
86 /* Waiting for a module to finish initializing? */
87 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
89 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
91 /* Bounds of module allocation, for speeding __module_address */
92 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
94 int register_module_notifier(struct notifier_block * nb)
96 return blocking_notifier_chain_register(&module_notify_list, nb);
98 EXPORT_SYMBOL(register_module_notifier);
100 int unregister_module_notifier(struct notifier_block * nb)
102 return blocking_notifier_chain_unregister(&module_notify_list, nb);
104 EXPORT_SYMBOL(unregister_module_notifier);
106 /* We require a truly strong try_module_get(): 0 means failure due to
107 ongoing or failed initialization etc. */
108 static inline int strong_try_module_get(struct module *mod)
110 if (mod && mod->state == MODULE_STATE_COMING)
112 if (try_module_get(mod))
118 static inline void add_taint_module(struct module *mod, unsigned flag)
121 mod->taints |= (1U << flag);
125 * A thread that wants to hold a reference to a module only while it
126 * is running can call this to safely exit. nfsd and lockd use this.
128 void __module_put_and_exit(struct module *mod, long code)
133 EXPORT_SYMBOL(__module_put_and_exit);
135 /* Find a module section: 0 means not found. */
136 static unsigned int find_sec(Elf_Ehdr *hdr,
138 const char *secstrings,
143 for (i = 1; i < hdr->e_shnum; i++)
144 /* Alloc bit cleared means "ignore it." */
145 if ((sechdrs[i].sh_flags & SHF_ALLOC)
146 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
151 /* Find a module section, or NULL. */
152 static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
153 const char *secstrings, const char *name)
155 /* Section 0 has sh_addr 0. */
156 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
159 /* Find a module section, or NULL. Fill in number of "objects" in section. */
160 static void *section_objs(Elf_Ehdr *hdr,
162 const char *secstrings,
167 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
169 /* Section 0 has sh_addr 0 and sh_size 0. */
170 *num = sechdrs[sec].sh_size / object_size;
171 return (void *)sechdrs[sec].sh_addr;
174 /* Provided by the linker */
175 extern const struct kernel_symbol __start___ksymtab[];
176 extern const struct kernel_symbol __stop___ksymtab[];
177 extern const struct kernel_symbol __start___ksymtab_gpl[];
178 extern const struct kernel_symbol __stop___ksymtab_gpl[];
179 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
180 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
181 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
182 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
183 extern const unsigned long __start___kcrctab[];
184 extern const unsigned long __start___kcrctab_gpl[];
185 extern const unsigned long __start___kcrctab_gpl_future[];
186 #ifdef CONFIG_UNUSED_SYMBOLS
187 extern const struct kernel_symbol __start___ksymtab_unused[];
188 extern const struct kernel_symbol __stop___ksymtab_unused[];
189 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
190 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
191 extern const unsigned long __start___kcrctab_unused[];
192 extern const unsigned long __start___kcrctab_unused_gpl[];
195 #ifndef CONFIG_MODVERSIONS
196 #define symversion(base, idx) NULL
198 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
201 static bool each_symbol_in_section(const struct symsearch *arr,
202 unsigned int arrsize,
203 struct module *owner,
204 bool (*fn)(const struct symsearch *syms,
205 struct module *owner,
206 unsigned int symnum, void *data),
211 for (j = 0; j < arrsize; j++) {
212 for (i = 0; i < arr[j].stop - arr[j].start; i++)
213 if (fn(&arr[j], owner, i, data))
220 /* Returns true as soon as fn returns true, otherwise false. */
221 bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
222 unsigned int symnum, void *data), void *data)
225 const struct symsearch arr[] = {
226 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
227 NOT_GPL_ONLY, false },
228 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
229 __start___kcrctab_gpl,
231 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
232 __start___kcrctab_gpl_future,
233 WILL_BE_GPL_ONLY, false },
234 #ifdef CONFIG_UNUSED_SYMBOLS
235 { __start___ksymtab_unused, __stop___ksymtab_unused,
236 __start___kcrctab_unused,
237 NOT_GPL_ONLY, true },
238 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
239 __start___kcrctab_unused_gpl,
244 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
247 list_for_each_entry_rcu(mod, &modules, list) {
248 struct symsearch arr[] = {
249 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
250 NOT_GPL_ONLY, false },
251 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
254 { mod->gpl_future_syms,
255 mod->gpl_future_syms + mod->num_gpl_future_syms,
256 mod->gpl_future_crcs,
257 WILL_BE_GPL_ONLY, false },
258 #ifdef CONFIG_UNUSED_SYMBOLS
260 mod->unused_syms + mod->num_unused_syms,
262 NOT_GPL_ONLY, true },
263 { mod->unused_gpl_syms,
264 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
265 mod->unused_gpl_crcs,
270 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
275 EXPORT_SYMBOL_GPL(each_symbol);
277 struct find_symbol_arg {
284 struct module *owner;
285 const unsigned long *crc;
286 const struct kernel_symbol *sym;
289 static bool find_symbol_in_section(const struct symsearch *syms,
290 struct module *owner,
291 unsigned int symnum, void *data)
293 struct find_symbol_arg *fsa = data;
295 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
299 if (syms->licence == GPL_ONLY)
301 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
302 printk(KERN_WARNING "Symbol %s is being used "
303 "by a non-GPL module, which will not "
304 "be allowed in the future\n", fsa->name);
305 printk(KERN_WARNING "Please see the file "
306 "Documentation/feature-removal-schedule.txt "
307 "in the kernel source tree for more details.\n");
311 #ifdef CONFIG_UNUSED_SYMBOLS
312 if (syms->unused && fsa->warn) {
313 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
314 "however this module is using it.\n", fsa->name);
316 "This symbol will go away in the future.\n");
318 "Please evalute if this is the right api to use and if "
319 "it really is, submit a report the linux kernel "
320 "mailinglist together with submitting your code for "
326 fsa->crc = symversion(syms->crcs, symnum);
327 fsa->sym = &syms->start[symnum];
331 /* Find a symbol and return it, along with, (optional) crc and
332 * (optional) module which owns it */
333 const struct kernel_symbol *find_symbol(const char *name,
334 struct module **owner,
335 const unsigned long **crc,
339 struct find_symbol_arg fsa;
345 if (each_symbol(find_symbol_in_section, &fsa)) {
353 DEBUGP("Failed to find symbol %s\n", name);
356 EXPORT_SYMBOL_GPL(find_symbol);
358 /* Search for module by name: must hold module_mutex. */
359 struct module *find_module(const char *name)
363 list_for_each_entry(mod, &modules, list) {
364 if (strcmp(mod->name, name) == 0)
369 EXPORT_SYMBOL_GPL(find_module);
373 static void *percpu_modalloc(unsigned long size, unsigned long align,
378 if (align > PAGE_SIZE) {
379 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
380 name, align, PAGE_SIZE);
384 ptr = __alloc_reserved_percpu(size, align);
387 "Could not allocate %lu bytes percpu data\n", size);
391 static void percpu_modfree(void *freeme)
396 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
398 const char *secstrings)
400 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
403 static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
407 for_each_possible_cpu(cpu)
408 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
411 #else /* ... !CONFIG_SMP */
413 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
418 static inline void percpu_modfree(void *pcpuptr)
422 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
424 const char *secstrings)
428 static inline void percpu_modcopy(void *pcpudst, const void *src,
431 /* pcpusec should be 0, and size of that section should be 0. */
435 #endif /* CONFIG_SMP */
437 #define MODINFO_ATTR(field) \
438 static void setup_modinfo_##field(struct module *mod, const char *s) \
440 mod->field = kstrdup(s, GFP_KERNEL); \
442 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
443 struct module *mod, char *buffer) \
445 return sprintf(buffer, "%s\n", mod->field); \
447 static int modinfo_##field##_exists(struct module *mod) \
449 return mod->field != NULL; \
451 static void free_modinfo_##field(struct module *mod) \
456 static struct module_attribute modinfo_##field = { \
457 .attr = { .name = __stringify(field), .mode = 0444 }, \
458 .show = show_modinfo_##field, \
459 .setup = setup_modinfo_##field, \
460 .test = modinfo_##field##_exists, \
461 .free = free_modinfo_##field, \
464 MODINFO_ATTR(version);
465 MODINFO_ATTR(srcversion);
467 static char last_unloaded_module[MODULE_NAME_LEN+1];
469 #ifdef CONFIG_MODULE_UNLOAD
470 /* Init the unload section of the module. */
471 static void module_unload_init(struct module *mod)
475 INIT_LIST_HEAD(&mod->modules_which_use_me);
476 for_each_possible_cpu(cpu)
477 per_cpu_ptr(mod->refptr, cpu)->count = 0;
479 /* Hold reference count during initialization. */
480 __this_cpu_write(mod->refptr->count, 1);
481 /* Backwards compatibility macros put refcount during init. */
482 mod->waiter = current;
485 /* modules using other modules */
488 struct list_head list;
489 struct module *module_which_uses;
492 /* Does a already use b? */
493 static int already_uses(struct module *a, struct module *b)
495 struct module_use *use;
497 list_for_each_entry(use, &b->modules_which_use_me, list) {
498 if (use->module_which_uses == a) {
499 DEBUGP("%s uses %s!\n", a->name, b->name);
503 DEBUGP("%s does not use %s!\n", a->name, b->name);
507 /* Module a uses b */
508 int use_module(struct module *a, struct module *b)
510 struct module_use *use;
513 if (b == NULL || already_uses(a, b)) return 1;
515 /* If we're interrupted or time out, we fail. */
516 if (wait_event_interruptible_timeout(
517 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
519 printk("%s: gave up waiting for init of module %s.\n",
524 /* If strong_try_module_get() returned a different error, we fail. */
528 DEBUGP("Allocating new usage for %s.\n", a->name);
529 use = kmalloc(sizeof(*use), GFP_ATOMIC);
531 printk("%s: out of memory loading\n", a->name);
536 use->module_which_uses = a;
537 list_add(&use->list, &b->modules_which_use_me);
538 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
541 EXPORT_SYMBOL_GPL(use_module);
543 /* Clear the unload stuff of the module. */
544 static void module_unload_free(struct module *mod)
548 list_for_each_entry(i, &modules, list) {
549 struct module_use *use;
551 list_for_each_entry(use, &i->modules_which_use_me, list) {
552 if (use->module_which_uses == mod) {
553 DEBUGP("%s unusing %s\n", mod->name, i->name);
555 list_del(&use->list);
557 sysfs_remove_link(i->holders_dir, mod->name);
558 /* There can be at most one match. */
565 #ifdef CONFIG_MODULE_FORCE_UNLOAD
566 static inline int try_force_unload(unsigned int flags)
568 int ret = (flags & O_TRUNC);
570 add_taint(TAINT_FORCED_RMMOD);
574 static inline int try_force_unload(unsigned int flags)
578 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
587 /* Whole machine is stopped with interrupts off when this runs. */
588 static int __try_stop_module(void *_sref)
590 struct stopref *sref = _sref;
592 /* If it's not unused, quit unless we're forcing. */
593 if (module_refcount(sref->mod) != 0) {
594 if (!(*sref->forced = try_force_unload(sref->flags)))
598 /* Mark it as dying. */
599 sref->mod->state = MODULE_STATE_GOING;
603 static int try_stop_module(struct module *mod, int flags, int *forced)
605 if (flags & O_NONBLOCK) {
606 struct stopref sref = { mod, flags, forced };
608 return stop_machine(__try_stop_module, &sref, NULL);
610 /* We don't need to stop the machine for this. */
611 mod->state = MODULE_STATE_GOING;
617 unsigned int module_refcount(struct module *mod)
619 unsigned int total = 0;
622 for_each_possible_cpu(cpu)
623 total += per_cpu_ptr(mod->refptr, cpu)->count;
626 EXPORT_SYMBOL(module_refcount);
628 /* This exists whether we can unload or not */
629 static void free_module(struct module *mod);
631 static void wait_for_zero_refcount(struct module *mod)
633 /* Since we might sleep for some time, release the mutex first */
634 mutex_unlock(&module_mutex);
636 DEBUGP("Looking at refcount...\n");
637 set_current_state(TASK_UNINTERRUPTIBLE);
638 if (module_refcount(mod) == 0)
642 current->state = TASK_RUNNING;
643 mutex_lock(&module_mutex);
646 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
650 char name[MODULE_NAME_LEN];
653 if (!capable(CAP_SYS_MODULE) || modules_disabled)
656 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
658 name[MODULE_NAME_LEN-1] = '\0';
660 /* Create stop_machine threads since free_module relies on
661 * a non-failing stop_machine call. */
662 ret = stop_machine_create();
666 if (mutex_lock_interruptible(&module_mutex) != 0) {
671 mod = find_module(name);
677 if (!list_empty(&mod->modules_which_use_me)) {
678 /* Other modules depend on us: get rid of them first. */
683 /* Doing init or already dying? */
684 if (mod->state != MODULE_STATE_LIVE) {
685 /* FIXME: if (force), slam module count and wake up
687 DEBUGP("%s already dying\n", mod->name);
692 /* If it has an init func, it must have an exit func to unload */
693 if (mod->init && !mod->exit) {
694 forced = try_force_unload(flags);
696 /* This module can't be removed */
702 /* Set this up before setting mod->state */
703 mod->waiter = current;
705 /* Stop the machine so refcounts can't move and disable module. */
706 ret = try_stop_module(mod, flags, &forced);
710 /* Never wait if forced. */
711 if (!forced && module_refcount(mod) != 0)
712 wait_for_zero_refcount(mod);
714 mutex_unlock(&module_mutex);
715 /* Final destruction now noone is using it. */
716 if (mod->exit != NULL)
718 blocking_notifier_call_chain(&module_notify_list,
719 MODULE_STATE_GOING, mod);
720 async_synchronize_full();
721 mutex_lock(&module_mutex);
722 /* Store the name of the last unloaded module for diagnostic purposes */
723 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
724 ddebug_remove_module(mod->name);
728 mutex_unlock(&module_mutex);
730 stop_machine_destroy();
734 static inline void print_unload_info(struct seq_file *m, struct module *mod)
736 struct module_use *use;
737 int printed_something = 0;
739 seq_printf(m, " %u ", module_refcount(mod));
741 /* Always include a trailing , so userspace can differentiate
742 between this and the old multi-field proc format. */
743 list_for_each_entry(use, &mod->modules_which_use_me, list) {
744 printed_something = 1;
745 seq_printf(m, "%s,", use->module_which_uses->name);
748 if (mod->init != NULL && mod->exit == NULL) {
749 printed_something = 1;
750 seq_printf(m, "[permanent],");
753 if (!printed_something)
757 void __symbol_put(const char *symbol)
759 struct module *owner;
762 if (!find_symbol(symbol, &owner, NULL, true, false))
767 EXPORT_SYMBOL(__symbol_put);
769 /* Note this assumes addr is a function, which it currently always is. */
770 void symbol_put_addr(void *addr)
772 struct module *modaddr;
773 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
775 if (core_kernel_text(a))
778 /* module_text_address is safe here: we're supposed to have reference
779 * to module from symbol_get, so it can't go away. */
780 modaddr = __module_text_address(a);
784 EXPORT_SYMBOL_GPL(symbol_put_addr);
786 static ssize_t show_refcnt(struct module_attribute *mattr,
787 struct module *mod, char *buffer)
789 return sprintf(buffer, "%u\n", module_refcount(mod));
792 static struct module_attribute refcnt = {
793 .attr = { .name = "refcnt", .mode = 0444 },
797 void module_put(struct module *module)
801 __this_cpu_dec(module->refptr->count);
803 trace_module_put(module, _RET_IP_);
804 /* Maybe they're waiting for us to drop reference? */
805 if (unlikely(!module_is_live(module)))
806 wake_up_process(module->waiter);
810 EXPORT_SYMBOL(module_put);
812 #else /* !CONFIG_MODULE_UNLOAD */
813 static inline void print_unload_info(struct seq_file *m, struct module *mod)
815 /* We don't know the usage count, or what modules are using. */
816 seq_printf(m, " - -");
819 static inline void module_unload_free(struct module *mod)
823 int use_module(struct module *a, struct module *b)
825 return strong_try_module_get(b) == 0;
827 EXPORT_SYMBOL_GPL(use_module);
829 static inline void module_unload_init(struct module *mod)
832 #endif /* CONFIG_MODULE_UNLOAD */
834 static ssize_t show_initstate(struct module_attribute *mattr,
835 struct module *mod, char *buffer)
837 const char *state = "unknown";
839 switch (mod->state) {
840 case MODULE_STATE_LIVE:
843 case MODULE_STATE_COMING:
846 case MODULE_STATE_GOING:
850 return sprintf(buffer, "%s\n", state);
853 static struct module_attribute initstate = {
854 .attr = { .name = "initstate", .mode = 0444 },
855 .show = show_initstate,
858 static struct module_attribute *modinfo_attrs[] = {
862 #ifdef CONFIG_MODULE_UNLOAD
868 static const char vermagic[] = VERMAGIC_STRING;
870 static int try_to_force_load(struct module *mod, const char *reason)
872 #ifdef CONFIG_MODULE_FORCE_LOAD
873 if (!test_taint(TAINT_FORCED_MODULE))
874 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
876 add_taint_module(mod, TAINT_FORCED_MODULE);
883 #ifdef CONFIG_MODVERSIONS
884 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
885 static unsigned long maybe_relocated(unsigned long crc,
886 const struct module *crc_owner)
888 #ifdef ARCH_RELOCATES_KCRCTAB
889 if (crc_owner == NULL)
890 return crc - (unsigned long)reloc_start;
895 static int check_version(Elf_Shdr *sechdrs,
896 unsigned int versindex,
899 const unsigned long *crc,
900 const struct module *crc_owner)
902 unsigned int i, num_versions;
903 struct modversion_info *versions;
905 /* Exporting module didn't supply crcs? OK, we're already tainted. */
909 /* No versions at all? modprobe --force does this. */
911 return try_to_force_load(mod, symname) == 0;
913 versions = (void *) sechdrs[versindex].sh_addr;
914 num_versions = sechdrs[versindex].sh_size
915 / sizeof(struct modversion_info);
917 for (i = 0; i < num_versions; i++) {
918 if (strcmp(versions[i].name, symname) != 0)
921 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
923 DEBUGP("Found checksum %lX vs module %lX\n",
924 maybe_relocated(*crc, crc_owner), versions[i].crc);
928 printk(KERN_WARNING "%s: no symbol version for %s\n",
933 printk("%s: disagrees about version of symbol %s\n",
938 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
939 unsigned int versindex,
942 const unsigned long *crc;
944 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
947 return check_version(sechdrs, versindex, "module_layout", mod, crc,
951 /* First part is kernel version, which we ignore if module has crcs. */
952 static inline int same_magic(const char *amagic, const char *bmagic,
956 amagic += strcspn(amagic, " ");
957 bmagic += strcspn(bmagic, " ");
959 return strcmp(amagic, bmagic) == 0;
962 static inline int check_version(Elf_Shdr *sechdrs,
963 unsigned int versindex,
966 const unsigned long *crc,
967 const struct module *crc_owner)
972 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
973 unsigned int versindex,
979 static inline int same_magic(const char *amagic, const char *bmagic,
982 return strcmp(amagic, bmagic) == 0;
984 #endif /* CONFIG_MODVERSIONS */
986 /* Resolve a symbol for this module. I.e. if we find one, record usage.
987 Must be holding module_mutex. */
988 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
989 unsigned int versindex,
993 struct module *owner;
994 const struct kernel_symbol *sym;
995 const unsigned long *crc;
997 sym = find_symbol(name, &owner, &crc,
998 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
999 /* use_module can fail due to OOM,
1000 or module initialization or unloading */
1002 if (!check_version(sechdrs, versindex, name, mod, crc, owner)
1003 || !use_module(mod, owner))
1010 * /sys/module/foo/sections stuff
1011 * J. Corbet <corbet@lwn.net>
1013 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1015 static inline bool sect_empty(const Elf_Shdr *sect)
1017 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1020 struct module_sect_attr
1022 struct module_attribute mattr;
1024 unsigned long address;
1027 struct module_sect_attrs
1029 struct attribute_group grp;
1030 unsigned int nsections;
1031 struct module_sect_attr attrs[0];
1034 static ssize_t module_sect_show(struct module_attribute *mattr,
1035 struct module *mod, char *buf)
1037 struct module_sect_attr *sattr =
1038 container_of(mattr, struct module_sect_attr, mattr);
1039 return sprintf(buf, "0x%lx\n", sattr->address);
1042 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1044 unsigned int section;
1046 for (section = 0; section < sect_attrs->nsections; section++)
1047 kfree(sect_attrs->attrs[section].name);
1051 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1052 char *secstrings, Elf_Shdr *sechdrs)
1054 unsigned int nloaded = 0, i, size[2];
1055 struct module_sect_attrs *sect_attrs;
1056 struct module_sect_attr *sattr;
1057 struct attribute **gattr;
1059 /* Count loaded sections and allocate structures */
1060 for (i = 0; i < nsect; i++)
1061 if (!sect_empty(&sechdrs[i]))
1063 size[0] = ALIGN(sizeof(*sect_attrs)
1064 + nloaded * sizeof(sect_attrs->attrs[0]),
1065 sizeof(sect_attrs->grp.attrs[0]));
1066 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1067 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1068 if (sect_attrs == NULL)
1071 /* Setup section attributes. */
1072 sect_attrs->grp.name = "sections";
1073 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1075 sect_attrs->nsections = 0;
1076 sattr = §_attrs->attrs[0];
1077 gattr = §_attrs->grp.attrs[0];
1078 for (i = 0; i < nsect; i++) {
1079 if (sect_empty(&sechdrs[i]))
1081 sattr->address = sechdrs[i].sh_addr;
1082 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1084 if (sattr->name == NULL)
1086 sect_attrs->nsections++;
1087 sysfs_attr_init(&sattr->mattr.attr);
1088 sattr->mattr.show = module_sect_show;
1089 sattr->mattr.store = NULL;
1090 sattr->mattr.attr.name = sattr->name;
1091 sattr->mattr.attr.mode = S_IRUGO;
1092 *(gattr++) = &(sattr++)->mattr.attr;
1096 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1099 mod->sect_attrs = sect_attrs;
1102 free_sect_attrs(sect_attrs);
1105 static void remove_sect_attrs(struct module *mod)
1107 if (mod->sect_attrs) {
1108 sysfs_remove_group(&mod->mkobj.kobj,
1109 &mod->sect_attrs->grp);
1110 /* We are positive that no one is using any sect attrs
1111 * at this point. Deallocate immediately. */
1112 free_sect_attrs(mod->sect_attrs);
1113 mod->sect_attrs = NULL;
1118 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1121 struct module_notes_attrs {
1122 struct kobject *dir;
1124 struct bin_attribute attrs[0];
1127 static ssize_t module_notes_read(struct kobject *kobj,
1128 struct bin_attribute *bin_attr,
1129 char *buf, loff_t pos, size_t count)
1132 * The caller checked the pos and count against our size.
1134 memcpy(buf, bin_attr->private + pos, count);
1138 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1141 if (notes_attrs->dir) {
1143 sysfs_remove_bin_file(notes_attrs->dir,
1144 ¬es_attrs->attrs[i]);
1145 kobject_put(notes_attrs->dir);
1150 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1151 char *secstrings, Elf_Shdr *sechdrs)
1153 unsigned int notes, loaded, i;
1154 struct module_notes_attrs *notes_attrs;
1155 struct bin_attribute *nattr;
1157 /* failed to create section attributes, so can't create notes */
1158 if (!mod->sect_attrs)
1161 /* Count notes sections and allocate structures. */
1163 for (i = 0; i < nsect; i++)
1164 if (!sect_empty(&sechdrs[i]) &&
1165 (sechdrs[i].sh_type == SHT_NOTE))
1171 notes_attrs = kzalloc(sizeof(*notes_attrs)
1172 + notes * sizeof(notes_attrs->attrs[0]),
1174 if (notes_attrs == NULL)
1177 notes_attrs->notes = notes;
1178 nattr = ¬es_attrs->attrs[0];
1179 for (loaded = i = 0; i < nsect; ++i) {
1180 if (sect_empty(&sechdrs[i]))
1182 if (sechdrs[i].sh_type == SHT_NOTE) {
1183 sysfs_bin_attr_init(nattr);
1184 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1185 nattr->attr.mode = S_IRUGO;
1186 nattr->size = sechdrs[i].sh_size;
1187 nattr->private = (void *) sechdrs[i].sh_addr;
1188 nattr->read = module_notes_read;
1194 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1195 if (!notes_attrs->dir)
1198 for (i = 0; i < notes; ++i)
1199 if (sysfs_create_bin_file(notes_attrs->dir,
1200 ¬es_attrs->attrs[i]))
1203 mod->notes_attrs = notes_attrs;
1207 free_notes_attrs(notes_attrs, i);
1210 static void remove_notes_attrs(struct module *mod)
1212 if (mod->notes_attrs)
1213 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1218 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1219 char *sectstrings, Elf_Shdr *sechdrs)
1223 static inline void remove_sect_attrs(struct module *mod)
1227 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1228 char *sectstrings, Elf_Shdr *sechdrs)
1232 static inline void remove_notes_attrs(struct module *mod)
1238 int module_add_modinfo_attrs(struct module *mod)
1240 struct module_attribute *attr;
1241 struct module_attribute *temp_attr;
1245 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1246 (ARRAY_SIZE(modinfo_attrs) + 1)),
1248 if (!mod->modinfo_attrs)
1251 temp_attr = mod->modinfo_attrs;
1252 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1254 (attr->test && attr->test(mod))) {
1255 memcpy(temp_attr, attr, sizeof(*temp_attr));
1256 sysfs_attr_init(&temp_attr->attr);
1257 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1264 void module_remove_modinfo_attrs(struct module *mod)
1266 struct module_attribute *attr;
1269 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1270 /* pick a field to test for end of list */
1271 if (!attr->attr.name)
1273 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1277 kfree(mod->modinfo_attrs);
1280 int mod_sysfs_init(struct module *mod)
1283 struct kobject *kobj;
1285 if (!module_sysfs_initialized) {
1286 printk(KERN_ERR "%s: module sysfs not initialized\n",
1292 kobj = kset_find_obj(module_kset, mod->name);
1294 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1300 mod->mkobj.mod = mod;
1302 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1303 mod->mkobj.kobj.kset = module_kset;
1304 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1307 kobject_put(&mod->mkobj.kobj);
1309 /* delay uevent until full sysfs population */
1314 int mod_sysfs_setup(struct module *mod,
1315 struct kernel_param *kparam,
1316 unsigned int num_params)
1320 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1321 if (!mod->holders_dir) {
1326 err = module_param_sysfs_setup(mod, kparam, num_params);
1328 goto out_unreg_holders;
1330 err = module_add_modinfo_attrs(mod);
1332 goto out_unreg_param;
1334 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1338 module_param_sysfs_remove(mod);
1340 kobject_put(mod->holders_dir);
1342 kobject_put(&mod->mkobj.kobj);
1346 static void mod_sysfs_fini(struct module *mod)
1348 kobject_put(&mod->mkobj.kobj);
1351 #else /* CONFIG_SYSFS */
1353 static void mod_sysfs_fini(struct module *mod)
1357 #endif /* CONFIG_SYSFS */
1359 static void mod_kobject_remove(struct module *mod)
1361 module_remove_modinfo_attrs(mod);
1362 module_param_sysfs_remove(mod);
1363 kobject_put(mod->mkobj.drivers_dir);
1364 kobject_put(mod->holders_dir);
1365 mod_sysfs_fini(mod);
1369 * unlink the module with the whole machine is stopped with interrupts off
1370 * - this defends against kallsyms not taking locks
1372 static int __unlink_module(void *_mod)
1374 struct module *mod = _mod;
1375 list_del(&mod->list);
1379 /* Free a module, remove from lists, etc (must hold module_mutex). */
1380 static void free_module(struct module *mod)
1382 trace_module_free(mod);
1384 /* Delete from various lists */
1385 stop_machine(__unlink_module, mod, NULL);
1386 remove_notes_attrs(mod);
1387 remove_sect_attrs(mod);
1388 mod_kobject_remove(mod);
1390 /* Arch-specific cleanup. */
1391 module_arch_cleanup(mod);
1393 /* Module unload stuff */
1394 module_unload_free(mod);
1396 /* Free any allocated parameters. */
1397 destroy_params(mod->kp, mod->num_kp);
1399 /* This may be NULL, but that's OK */
1400 module_free(mod, mod->module_init);
1403 percpu_modfree(mod->percpu);
1404 #if defined(CONFIG_MODULE_UNLOAD)
1406 free_percpu(mod->refptr);
1408 /* Free lock-classes: */
1409 lockdep_free_key_range(mod->module_core, mod->core_size);
1411 /* Finally, free the core (containing the module structure) */
1412 module_free(mod, mod->module_core);
1415 update_protections(current->mm);
1419 void *__symbol_get(const char *symbol)
1421 struct module *owner;
1422 const struct kernel_symbol *sym;
1425 sym = find_symbol(symbol, &owner, NULL, true, true);
1426 if (sym && strong_try_module_get(owner))
1430 return sym ? (void *)sym->value : NULL;
1432 EXPORT_SYMBOL_GPL(__symbol_get);
1435 * Ensure that an exported symbol [global namespace] does not already exist
1436 * in the kernel or in some other module's exported symbol table.
1438 static int verify_export_symbols(struct module *mod)
1441 struct module *owner;
1442 const struct kernel_symbol *s;
1444 const struct kernel_symbol *sym;
1447 { mod->syms, mod->num_syms },
1448 { mod->gpl_syms, mod->num_gpl_syms },
1449 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1450 #ifdef CONFIG_UNUSED_SYMBOLS
1451 { mod->unused_syms, mod->num_unused_syms },
1452 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1456 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1457 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1458 if (find_symbol(s->name, &owner, NULL, true, false)) {
1460 "%s: exports duplicate symbol %s"
1462 mod->name, s->name, module_name(owner));
1470 /* Change all symbols so that st_value encodes the pointer directly. */
1471 static int simplify_symbols(Elf_Shdr *sechdrs,
1472 unsigned int symindex,
1474 unsigned int versindex,
1475 unsigned int pcpuindex,
1478 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1479 unsigned long secbase;
1480 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1482 const struct kernel_symbol *ksym;
1484 for (i = 1; i < n; i++) {
1485 switch (sym[i].st_shndx) {
1487 /* We compiled with -fno-common. These are not
1488 supposed to happen. */
1489 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1490 printk("%s: please compile with -fno-common\n",
1496 /* Don't need to do anything */
1497 DEBUGP("Absolute symbol: 0x%08lx\n",
1498 (long)sym[i].st_value);
1502 ksym = resolve_symbol(sechdrs, versindex,
1503 strtab + sym[i].st_name, mod);
1504 /* Ok if resolved. */
1506 sym[i].st_value = ksym->value;
1511 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1514 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1515 mod->name, strtab + sym[i].st_name);
1520 /* Divert to percpu allocation if a percpu var. */
1521 if (sym[i].st_shndx == pcpuindex)
1522 secbase = (unsigned long)mod->percpu;
1524 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1525 sym[i].st_value += secbase;
1533 /* Additional bytes needed by arch in front of individual sections */
1534 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1535 unsigned int section)
1537 /* default implementation just returns zero */
1541 /* Update size with this section: return offset. */
1542 static long get_offset(struct module *mod, unsigned int *size,
1543 Elf_Shdr *sechdr, unsigned int section)
1547 *size += arch_mod_section_prepend(mod, section);
1548 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1549 *size = ret + sechdr->sh_size;
1553 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1554 might -- code, read-only data, read-write data, small data. Tally
1555 sizes, and place the offsets into sh_entsize fields: high bit means it
1557 static void layout_sections(struct module *mod,
1558 const Elf_Ehdr *hdr,
1560 const char *secstrings)
1562 static unsigned long const masks[][2] = {
1563 /* NOTE: all executable code must be the first section
1564 * in this array; otherwise modify the text_size
1565 * finder in the two loops below */
1566 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1567 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1568 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1569 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1573 for (i = 0; i < hdr->e_shnum; i++)
1574 sechdrs[i].sh_entsize = ~0UL;
1576 DEBUGP("Core section allocation order:\n");
1577 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1578 for (i = 0; i < hdr->e_shnum; ++i) {
1579 Elf_Shdr *s = &sechdrs[i];
1581 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1582 || (s->sh_flags & masks[m][1])
1583 || s->sh_entsize != ~0UL
1584 || strstarts(secstrings + s->sh_name, ".init"))
1586 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1587 DEBUGP("\t%s\n", secstrings + s->sh_name);
1590 mod->core_text_size = mod->core_size;
1593 DEBUGP("Init section allocation order:\n");
1594 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1595 for (i = 0; i < hdr->e_shnum; ++i) {
1596 Elf_Shdr *s = &sechdrs[i];
1598 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1599 || (s->sh_flags & masks[m][1])
1600 || s->sh_entsize != ~0UL
1601 || !strstarts(secstrings + s->sh_name, ".init"))
1603 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1604 | INIT_OFFSET_MASK);
1605 DEBUGP("\t%s\n", secstrings + s->sh_name);
1608 mod->init_text_size = mod->init_size;
1612 static void set_license(struct module *mod, const char *license)
1615 license = "unspecified";
1617 if (!license_is_gpl_compatible(license)) {
1618 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1619 printk(KERN_WARNING "%s: module license '%s' taints "
1620 "kernel.\n", mod->name, license);
1621 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1625 /* Parse tag=value strings from .modinfo section */
1626 static char *next_string(char *string, unsigned long *secsize)
1628 /* Skip non-zero chars */
1631 if ((*secsize)-- <= 1)
1635 /* Skip any zero padding. */
1636 while (!string[0]) {
1638 if ((*secsize)-- <= 1)
1644 static char *get_modinfo(Elf_Shdr *sechdrs,
1649 unsigned int taglen = strlen(tag);
1650 unsigned long size = sechdrs[info].sh_size;
1652 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1653 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1654 return p + taglen + 1;
1659 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1660 unsigned int infoindex)
1662 struct module_attribute *attr;
1665 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1668 get_modinfo(sechdrs,
1674 static void free_modinfo(struct module *mod)
1676 struct module_attribute *attr;
1679 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1685 #ifdef CONFIG_KALLSYMS
1687 /* lookup symbol in given range of kernel_symbols */
1688 static const struct kernel_symbol *lookup_symbol(const char *name,
1689 const struct kernel_symbol *start,
1690 const struct kernel_symbol *stop)
1692 const struct kernel_symbol *ks = start;
1693 for (; ks < stop; ks++)
1694 if (strcmp(ks->name, name) == 0)
1699 static int is_exported(const char *name, unsigned long value,
1700 const struct module *mod)
1702 const struct kernel_symbol *ks;
1704 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1706 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1707 return ks != NULL && ks->value == value;
1711 static char elf_type(const Elf_Sym *sym,
1713 const char *secstrings,
1716 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1717 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1722 if (sym->st_shndx == SHN_UNDEF)
1724 if (sym->st_shndx == SHN_ABS)
1726 if (sym->st_shndx >= SHN_LORESERVE)
1728 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1730 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1731 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1732 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1734 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1739 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1740 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1745 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1750 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1753 const Elf_Shdr *sec;
1755 if (src->st_shndx == SHN_UNDEF
1756 || src->st_shndx >= shnum
1760 sec = sechdrs + src->st_shndx;
1761 if (!(sec->sh_flags & SHF_ALLOC)
1762 #ifndef CONFIG_KALLSYMS_ALL
1763 || !(sec->sh_flags & SHF_EXECINSTR)
1765 || (sec->sh_entsize & INIT_OFFSET_MASK))
1771 static unsigned long layout_symtab(struct module *mod,
1773 unsigned int symindex,
1774 unsigned int strindex,
1775 const Elf_Ehdr *hdr,
1776 const char *secstrings,
1777 unsigned long *pstroffs,
1778 unsigned long *strmap)
1780 unsigned long symoffs;
1781 Elf_Shdr *symsect = sechdrs + symindex;
1782 Elf_Shdr *strsect = sechdrs + strindex;
1785 unsigned int i, nsrc, ndst;
1787 /* Put symbol section at end of init part of module. */
1788 symsect->sh_flags |= SHF_ALLOC;
1789 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1790 symindex) | INIT_OFFSET_MASK;
1791 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1793 src = (void *)hdr + symsect->sh_offset;
1794 nsrc = symsect->sh_size / sizeof(*src);
1795 strtab = (void *)hdr + strsect->sh_offset;
1796 for (ndst = i = 1; i < nsrc; ++i, ++src)
1797 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1798 unsigned int j = src->st_name;
1800 while(!__test_and_set_bit(j, strmap) && strtab[j])
1805 /* Append room for core symbols at end of core part. */
1806 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1807 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1809 /* Put string table section at end of init part of module. */
1810 strsect->sh_flags |= SHF_ALLOC;
1811 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1812 strindex) | INIT_OFFSET_MASK;
1813 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1815 /* Append room for core symbols' strings at end of core part. */
1816 *pstroffs = mod->core_size;
1817 __set_bit(0, strmap);
1818 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1823 static void add_kallsyms(struct module *mod,
1826 unsigned int symindex,
1827 unsigned int strindex,
1828 unsigned long symoffs,
1829 unsigned long stroffs,
1830 const char *secstrings,
1831 unsigned long *strmap)
1833 unsigned int i, ndst;
1838 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1839 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1840 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1842 /* Set types up while we still have access to sections. */
1843 for (i = 0; i < mod->num_symtab; i++)
1844 mod->symtab[i].st_info
1845 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1847 mod->core_symtab = dst = mod->module_core + symoffs;
1850 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1851 if (!is_core_symbol(src, sechdrs, shnum))
1854 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
1857 mod->core_num_syms = ndst;
1859 mod->core_strtab = s = mod->module_core + stroffs;
1860 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1861 if (test_bit(i, strmap))
1862 *++s = mod->strtab[i];
1865 static inline unsigned long layout_symtab(struct module *mod,
1867 unsigned int symindex,
1868 unsigned int strindex,
1869 const Elf_Ehdr *hdr,
1870 const char *secstrings,
1871 unsigned long *pstroffs,
1872 unsigned long *strmap)
1877 static inline void add_kallsyms(struct module *mod,
1880 unsigned int symindex,
1881 unsigned int strindex,
1882 unsigned long symoffs,
1883 unsigned long stroffs,
1884 const char *secstrings,
1885 const unsigned long *strmap)
1888 #endif /* CONFIG_KALLSYMS */
1890 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1892 #ifdef CONFIG_DYNAMIC_DEBUG
1893 if (ddebug_add_module(debug, num, debug->modname))
1894 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1899 static void *module_alloc_update_bounds(unsigned long size)
1901 void *ret = module_alloc(size);
1904 /* Update module bounds. */
1905 if ((unsigned long)ret < module_addr_min)
1906 module_addr_min = (unsigned long)ret;
1907 if ((unsigned long)ret + size > module_addr_max)
1908 module_addr_max = (unsigned long)ret + size;
1913 #ifdef CONFIG_DEBUG_KMEMLEAK
1914 static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1915 Elf_Shdr *sechdrs, char *secstrings)
1919 /* only scan the sections containing data */
1920 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
1922 for (i = 1; i < hdr->e_shnum; i++) {
1923 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1925 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
1926 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
1929 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
1930 sechdrs[i].sh_size, GFP_KERNEL);
1934 static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1935 Elf_Shdr *sechdrs, char *secstrings)
1940 /* Allocate and load the module: note that size of section 0 is always
1941 zero, and we rely on this for optional sections. */
1942 static noinline struct module *load_module(void __user *umod,
1944 const char __user *uargs)
1948 char *secstrings, *args, *modmagic, *strtab = NULL;
1951 unsigned int symindex = 0;
1952 unsigned int strindex = 0;
1953 unsigned int modindex, versindex, infoindex, pcpuindex;
1956 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1957 unsigned long symoffs, stroffs, *strmap;
1959 mm_segment_t old_fs;
1961 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1963 if (len < sizeof(*hdr))
1964 return ERR_PTR(-ENOEXEC);
1966 /* Suck in entire file: we'll want most of it. */
1967 /* vmalloc barfs on "unusual" numbers. Check here */
1968 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1969 return ERR_PTR(-ENOMEM);
1971 if (copy_from_user(hdr, umod, len) != 0) {
1976 /* Sanity checks against insmoding binaries or wrong arch,
1977 weird elf version */
1978 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1979 || hdr->e_type != ET_REL
1980 || !elf_check_arch(hdr)
1981 || hdr->e_shentsize != sizeof(*sechdrs)) {
1986 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1989 /* Convenience variables */
1990 sechdrs = (void *)hdr + hdr->e_shoff;
1991 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1992 sechdrs[0].sh_addr = 0;
1994 for (i = 1; i < hdr->e_shnum; i++) {
1995 if (sechdrs[i].sh_type != SHT_NOBITS
1996 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1999 /* Mark all sections sh_addr with their address in the
2001 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
2003 /* Internal symbols and strings. */
2004 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2006 strindex = sechdrs[i].sh_link;
2007 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2009 #ifndef CONFIG_MODULE_UNLOAD
2010 /* Don't load .exit sections */
2011 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
2012 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2016 modindex = find_sec(hdr, sechdrs, secstrings,
2017 ".gnu.linkonce.this_module");
2019 printk(KERN_WARNING "No module found in object\n");
2023 /* This is temporary: point mod into copy of data. */
2024 mod = (void *)sechdrs[modindex].sh_addr;
2026 if (symindex == 0) {
2027 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2033 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2034 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2035 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2037 /* Don't keep modinfo and version sections. */
2038 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2039 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2041 /* Check module struct version now, before we try to use module. */
2042 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2047 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2048 /* This is allowed: modprobe --force will invalidate it. */
2050 err = try_to_force_load(mod, "bad vermagic");
2053 } else if (!same_magic(modmagic, vermagic, versindex)) {
2054 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2055 mod->name, modmagic, vermagic);
2060 staging = get_modinfo(sechdrs, infoindex, "staging");
2062 add_taint_module(mod, TAINT_CRAP);
2063 printk(KERN_WARNING "%s: module is from the staging directory,"
2064 " the quality is unknown, you have been warned.\n",
2068 /* Now copy in args */
2069 args = strndup_user(uargs, ~0UL >> 1);
2071 err = PTR_ERR(args);
2075 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2076 * sizeof(long), GFP_KERNEL);
2082 if (find_module(mod->name)) {
2087 mod->state = MODULE_STATE_COMING;
2089 /* Allow arches to frob section contents and sizes. */
2090 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2095 /* We have a special allocation for this section. */
2096 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2097 sechdrs[pcpuindex].sh_addralign,
2103 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2104 mod->percpu = percpu;
2107 /* Determine total sizes, and put offsets in sh_entsize. For now
2108 this is done generically; there doesn't appear to be any
2109 special cases for the architectures. */
2110 layout_sections(mod, hdr, sechdrs, secstrings);
2111 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2112 secstrings, &stroffs, strmap);
2114 /* Do the allocs. */
2115 ptr = module_alloc_update_bounds(mod->core_size);
2117 * The pointer to this block is stored in the module structure
2118 * which is inside the block. Just mark it as not being a
2121 kmemleak_not_leak(ptr);
2126 memset(ptr, 0, mod->core_size);
2127 mod->module_core = ptr;
2129 ptr = module_alloc_update_bounds(mod->init_size);
2131 * The pointer to this block is stored in the module structure
2132 * which is inside the block. This block doesn't need to be
2133 * scanned as it contains data and code that will be freed
2134 * after the module is initialized.
2136 kmemleak_ignore(ptr);
2137 if (!ptr && mod->init_size) {
2141 memset(ptr, 0, mod->init_size);
2142 mod->module_init = ptr;
2144 /* Transfer each section which specifies SHF_ALLOC */
2145 DEBUGP("final section addresses:\n");
2146 for (i = 0; i < hdr->e_shnum; i++) {
2149 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2152 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2153 dest = mod->module_init
2154 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2156 dest = mod->module_core + sechdrs[i].sh_entsize;
2158 if (sechdrs[i].sh_type != SHT_NOBITS)
2159 memcpy(dest, (void *)sechdrs[i].sh_addr,
2160 sechdrs[i].sh_size);
2161 /* Update sh_addr to point to copy in image. */
2162 sechdrs[i].sh_addr = (unsigned long)dest;
2163 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2165 /* Module has been moved. */
2166 mod = (void *)sechdrs[modindex].sh_addr;
2167 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2169 #if defined(CONFIG_MODULE_UNLOAD)
2170 mod->refptr = alloc_percpu(struct module_ref);
2176 /* Now we've moved module, initialize linked lists, etc. */
2177 module_unload_init(mod);
2179 /* add kobject, so we can reference it. */
2180 err = mod_sysfs_init(mod);
2184 /* Set up license info based on the info section */
2185 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2188 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2189 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2190 * using GPL-only symbols it needs.
2192 if (strcmp(mod->name, "ndiswrapper") == 0)
2193 add_taint(TAINT_PROPRIETARY_MODULE);
2195 /* driverloader was caught wrongly pretending to be under GPL */
2196 if (strcmp(mod->name, "driverloader") == 0)
2197 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2199 /* Set up MODINFO_ATTR fields */
2200 setup_modinfo(mod, sechdrs, infoindex);
2202 /* Fix up syms, so that st_value is a pointer to location. */
2203 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2208 /* Now we've got everything in the final locations, we can
2209 * find optional sections. */
2210 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2211 sizeof(*mod->kp), &mod->num_kp);
2212 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2213 sizeof(*mod->syms), &mod->num_syms);
2214 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2215 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2216 sizeof(*mod->gpl_syms),
2217 &mod->num_gpl_syms);
2218 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2219 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2220 "__ksymtab_gpl_future",
2221 sizeof(*mod->gpl_future_syms),
2222 &mod->num_gpl_future_syms);
2223 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2224 "__kcrctab_gpl_future");
2226 #ifdef CONFIG_UNUSED_SYMBOLS
2227 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2229 sizeof(*mod->unused_syms),
2230 &mod->num_unused_syms);
2231 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2232 "__kcrctab_unused");
2233 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2234 "__ksymtab_unused_gpl",
2235 sizeof(*mod->unused_gpl_syms),
2236 &mod->num_unused_gpl_syms);
2237 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2238 "__kcrctab_unused_gpl");
2240 #ifdef CONFIG_CONSTRUCTORS
2241 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2242 sizeof(*mod->ctors), &mod->num_ctors);
2245 #ifdef CONFIG_TRACEPOINTS
2246 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2248 sizeof(*mod->tracepoints),
2249 &mod->num_tracepoints);
2251 #ifdef CONFIG_EVENT_TRACING
2252 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2254 sizeof(*mod->trace_events),
2255 &mod->num_trace_events);
2257 * This section contains pointers to allocated objects in the trace
2258 * code and not scanning it leads to false positives.
2260 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2261 mod->num_trace_events, GFP_KERNEL);
2263 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2264 /* sechdrs[0].sh_size is always zero */
2265 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2267 sizeof(*mod->ftrace_callsites),
2268 &mod->num_ftrace_callsites);
2270 #ifdef CONFIG_MODVERSIONS
2271 if ((mod->num_syms && !mod->crcs)
2272 || (mod->num_gpl_syms && !mod->gpl_crcs)
2273 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2274 #ifdef CONFIG_UNUSED_SYMBOLS
2275 || (mod->num_unused_syms && !mod->unused_crcs)
2276 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2279 err = try_to_force_load(mod,
2280 "no versions for exported symbols");
2286 /* Now do relocations. */
2287 for (i = 1; i < hdr->e_shnum; i++) {
2288 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2289 unsigned int info = sechdrs[i].sh_info;
2291 /* Not a valid relocation section? */
2292 if (info >= hdr->e_shnum)
2295 /* Don't bother with non-allocated sections */
2296 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2299 if (sechdrs[i].sh_type == SHT_REL)
2300 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2301 else if (sechdrs[i].sh_type == SHT_RELA)
2302 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2308 /* Find duplicate symbols */
2309 err = verify_export_symbols(mod);
2313 /* Set up and sort exception table */
2314 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2315 sizeof(*mod->extable), &mod->num_exentries);
2316 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2318 /* Finally, copy percpu area over. */
2319 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2320 sechdrs[pcpuindex].sh_size);
2322 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2323 symoffs, stroffs, secstrings, strmap);
2328 struct _ddebug *debug;
2329 unsigned int num_debug;
2331 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2332 sizeof(*debug), &num_debug);
2334 dynamic_debug_setup(debug, num_debug);
2337 err = module_finalize(hdr, sechdrs, mod);
2341 /* flush the icache in correct context */
2346 * Flush the instruction cache, since we've played with text.
2347 * Do it before processing of module parameters, so the module
2348 * can provide parameter accessor functions of its own.
2350 if (mod->module_init)
2351 flush_icache_range((unsigned long)mod->module_init,
2352 (unsigned long)mod->module_init
2354 flush_icache_range((unsigned long)mod->module_core,
2355 (unsigned long)mod->module_core + mod->core_size);
2360 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2361 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2364 /* Now sew it into the lists so we can get lockdep and oops
2365 * info during argument parsing. Noone should access us, since
2366 * strong_try_module_get() will fail.
2367 * lockdep/oops can run asynchronous, so use the RCU list insertion
2368 * function to insert in a way safe to concurrent readers.
2369 * The mutex protects against concurrent writers.
2371 list_add_rcu(&mod->list, &modules);
2373 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2377 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2380 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2381 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2383 /* Get rid of temporary copy */
2386 trace_module_load(mod);
2392 /* Unlink carefully: kallsyms could be walking list. */
2393 list_del_rcu(&mod->list);
2394 synchronize_sched();
2395 module_arch_cleanup(mod);
2398 kobject_del(&mod->mkobj.kobj);
2399 kobject_put(&mod->mkobj.kobj);
2401 module_unload_free(mod);
2402 #if defined(CONFIG_MODULE_UNLOAD)
2403 free_percpu(mod->refptr);
2406 module_free(mod, mod->module_init);
2408 module_free(mod, mod->module_core);
2409 /* mod will be freed with core. Don't access it beyond this line! */
2412 percpu_modfree(percpu);
2418 return ERR_PTR(err);
2421 printk(KERN_ERR "Module len %lu truncated\n", len);
2426 /* Call module constructors. */
2427 static void do_mod_ctors(struct module *mod)
2429 #ifdef CONFIG_CONSTRUCTORS
2432 for (i = 0; i < mod->num_ctors; i++)
2437 /* This is where the real work happens */
2438 SYSCALL_DEFINE3(init_module, void __user *, umod,
2439 unsigned long, len, const char __user *, uargs)
2444 /* Must have permission */
2445 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2448 /* Only one module load at a time, please */
2449 if (mutex_lock_interruptible(&module_mutex) != 0)
2452 /* Do all the hard work */
2453 mod = load_module(umod, len, uargs);
2455 mutex_unlock(&module_mutex);
2456 return PTR_ERR(mod);
2459 /* Drop lock so they can recurse */
2460 mutex_unlock(&module_mutex);
2462 blocking_notifier_call_chain(&module_notify_list,
2463 MODULE_STATE_COMING, mod);
2466 /* Start the module */
2467 if (mod->init != NULL)
2468 ret = do_one_initcall(mod->init);
2470 /* Init routine failed: abort. Try to protect us from
2471 buggy refcounters. */
2472 mod->state = MODULE_STATE_GOING;
2473 synchronize_sched();
2475 blocking_notifier_call_chain(&module_notify_list,
2476 MODULE_STATE_GOING, mod);
2477 mutex_lock(&module_mutex);
2479 mutex_unlock(&module_mutex);
2480 wake_up(&module_wq);
2485 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2486 "%s: loading module anyway...\n",
2487 __func__, mod->name, ret,
2492 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2493 mod->state = MODULE_STATE_LIVE;
2494 wake_up(&module_wq);
2495 blocking_notifier_call_chain(&module_notify_list,
2496 MODULE_STATE_LIVE, mod);
2498 /* We need to finish all async code before the module init sequence is done */
2499 async_synchronize_full();
2501 mutex_lock(&module_mutex);
2502 /* Drop initial reference. */
2504 trim_init_extable(mod);
2505 #ifdef CONFIG_KALLSYMS
2506 mod->num_symtab = mod->core_num_syms;
2507 mod->symtab = mod->core_symtab;
2508 mod->strtab = mod->core_strtab;
2510 module_free(mod, mod->module_init);
2511 mod->module_init = NULL;
2513 mod->init_text_size = 0;
2514 mutex_unlock(&module_mutex);
2519 static inline int within(unsigned long addr, void *start, unsigned long size)
2521 return ((void *)addr >= start && (void *)addr < start + size);
2524 #ifdef CONFIG_KALLSYMS
2526 * This ignores the intensely annoying "mapping symbols" found
2527 * in ARM ELF files: $a, $t and $d.
2529 static inline int is_arm_mapping_symbol(const char *str)
2531 return str[0] == '$' && strchr("atd", str[1])
2532 && (str[2] == '\0' || str[2] == '.');
2535 static const char *get_ksymbol(struct module *mod,
2537 unsigned long *size,
2538 unsigned long *offset)
2540 unsigned int i, best = 0;
2541 unsigned long nextval;
2543 /* At worse, next value is at end of module */
2544 if (within_module_init(addr, mod))
2545 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2547 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2549 /* Scan for closest preceeding symbol, and next symbol. (ELF
2550 starts real symbols at 1). */
2551 for (i = 1; i < mod->num_symtab; i++) {
2552 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2555 /* We ignore unnamed symbols: they're uninformative
2556 * and inserted at a whim. */
2557 if (mod->symtab[i].st_value <= addr
2558 && mod->symtab[i].st_value > mod->symtab[best].st_value
2559 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2560 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2562 if (mod->symtab[i].st_value > addr
2563 && mod->symtab[i].st_value < nextval
2564 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2565 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2566 nextval = mod->symtab[i].st_value;
2573 *size = nextval - mod->symtab[best].st_value;
2575 *offset = addr - mod->symtab[best].st_value;
2576 return mod->strtab + mod->symtab[best].st_name;
2579 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2580 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2581 const char *module_address_lookup(unsigned long addr,
2582 unsigned long *size,
2583 unsigned long *offset,
2588 const char *ret = NULL;
2591 list_for_each_entry_rcu(mod, &modules, list) {
2592 if (within_module_init(addr, mod) ||
2593 within_module_core(addr, mod)) {
2595 *modname = mod->name;
2596 ret = get_ksymbol(mod, addr, size, offset);
2600 /* Make a copy in here where it's safe */
2602 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2609 int lookup_module_symbol_name(unsigned long addr, char *symname)
2614 list_for_each_entry_rcu(mod, &modules, list) {
2615 if (within_module_init(addr, mod) ||
2616 within_module_core(addr, mod)) {
2619 sym = get_ksymbol(mod, addr, NULL, NULL);
2622 strlcpy(symname, sym, KSYM_NAME_LEN);
2632 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2633 unsigned long *offset, char *modname, char *name)
2638 list_for_each_entry_rcu(mod, &modules, list) {
2639 if (within_module_init(addr, mod) ||
2640 within_module_core(addr, mod)) {
2643 sym = get_ksymbol(mod, addr, size, offset);
2647 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2649 strlcpy(name, sym, KSYM_NAME_LEN);
2659 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2660 char *name, char *module_name, int *exported)
2665 list_for_each_entry_rcu(mod, &modules, list) {
2666 if (symnum < mod->num_symtab) {
2667 *value = mod->symtab[symnum].st_value;
2668 *type = mod->symtab[symnum].st_info;
2669 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2671 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2672 *exported = is_exported(name, *value, mod);
2676 symnum -= mod->num_symtab;
2682 static unsigned long mod_find_symname(struct module *mod, const char *name)
2686 for (i = 0; i < mod->num_symtab; i++)
2687 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2688 mod->symtab[i].st_info != 'U')
2689 return mod->symtab[i].st_value;
2693 /* Look for this name: can be of form module:name. */
2694 unsigned long module_kallsyms_lookup_name(const char *name)
2698 unsigned long ret = 0;
2700 /* Don't lock: we're in enough trouble already. */
2702 if ((colon = strchr(name, ':')) != NULL) {
2704 if ((mod = find_module(name)) != NULL)
2705 ret = mod_find_symname(mod, colon+1);
2708 list_for_each_entry_rcu(mod, &modules, list)
2709 if ((ret = mod_find_symname(mod, name)) != 0)
2716 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2717 struct module *, unsigned long),
2724 list_for_each_entry(mod, &modules, list) {
2725 for (i = 0; i < mod->num_symtab; i++) {
2726 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2727 mod, mod->symtab[i].st_value);
2734 #endif /* CONFIG_KALLSYMS */
2736 static char *module_flags(struct module *mod, char *buf)
2741 mod->state == MODULE_STATE_GOING ||
2742 mod->state == MODULE_STATE_COMING) {
2744 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2746 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2748 if (mod->taints & (1 << TAINT_CRAP))
2751 * TAINT_FORCED_RMMOD: could be added.
2752 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2756 /* Show a - for module-is-being-unloaded */
2757 if (mod->state == MODULE_STATE_GOING)
2759 /* Show a + for module-is-being-loaded */
2760 if (mod->state == MODULE_STATE_COMING)
2769 #ifdef CONFIG_PROC_FS
2770 /* Called by the /proc file system to return a list of modules. */
2771 static void *m_start(struct seq_file *m, loff_t *pos)
2773 mutex_lock(&module_mutex);
2774 return seq_list_start(&modules, *pos);
2777 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2779 return seq_list_next(p, &modules, pos);
2782 static void m_stop(struct seq_file *m, void *p)
2784 mutex_unlock(&module_mutex);
2787 static int m_show(struct seq_file *m, void *p)
2789 struct module *mod = list_entry(p, struct module, list);
2792 seq_printf(m, "%s %u",
2793 mod->name, mod->init_size + mod->core_size);
2794 print_unload_info(m, mod);
2796 /* Informative for users. */
2797 seq_printf(m, " %s",
2798 mod->state == MODULE_STATE_GOING ? "Unloading":
2799 mod->state == MODULE_STATE_COMING ? "Loading":
2801 /* Used by oprofile and other similar tools. */
2802 seq_printf(m, " 0x%p", mod->module_core);
2806 seq_printf(m, " %s", module_flags(mod, buf));
2808 seq_printf(m, "\n");
2812 /* Format: modulename size refcount deps address
2814 Where refcount is a number or -, and deps is a comma-separated list
2817 static const struct seq_operations modules_op = {
2824 static int modules_open(struct inode *inode, struct file *file)
2826 return seq_open(file, &modules_op);
2829 static const struct file_operations proc_modules_operations = {
2830 .open = modules_open,
2832 .llseek = seq_lseek,
2833 .release = seq_release,
2836 static int __init proc_modules_init(void)
2838 proc_create("modules", 0, NULL, &proc_modules_operations);
2841 module_init(proc_modules_init);
2844 /* Given an address, look for it in the module exception tables. */
2845 const struct exception_table_entry *search_module_extables(unsigned long addr)
2847 const struct exception_table_entry *e = NULL;
2851 list_for_each_entry_rcu(mod, &modules, list) {
2852 if (mod->num_exentries == 0)
2855 e = search_extable(mod->extable,
2856 mod->extable + mod->num_exentries - 1,
2863 /* Now, if we found one, we are running inside it now, hence
2864 we cannot unload the module, hence no refcnt needed. */
2869 * is_module_address - is this address inside a module?
2870 * @addr: the address to check.
2872 * See is_module_text_address() if you simply want to see if the address
2873 * is code (not data).
2875 bool is_module_address(unsigned long addr)
2880 ret = __module_address(addr) != NULL;
2887 * __module_address - get the module which contains an address.
2888 * @addr: the address.
2890 * Must be called with preempt disabled or module mutex held so that
2891 * module doesn't get freed during this.
2893 struct module *__module_address(unsigned long addr)
2897 if (addr < module_addr_min || addr > module_addr_max)
2900 list_for_each_entry_rcu(mod, &modules, list)
2901 if (within_module_core(addr, mod)
2902 || within_module_init(addr, mod))
2906 EXPORT_SYMBOL_GPL(__module_address);
2909 * is_module_text_address - is this address inside module code?
2910 * @addr: the address to check.
2912 * See is_module_address() if you simply want to see if the address is
2913 * anywhere in a module. See kernel_text_address() for testing if an
2914 * address corresponds to kernel or module code.
2916 bool is_module_text_address(unsigned long addr)
2921 ret = __module_text_address(addr) != NULL;
2928 * __module_text_address - get the module whose code contains an address.
2929 * @addr: the address.
2931 * Must be called with preempt disabled or module mutex held so that
2932 * module doesn't get freed during this.
2934 struct module *__module_text_address(unsigned long addr)
2936 struct module *mod = __module_address(addr);
2938 /* Make sure it's within the text section. */
2939 if (!within(addr, mod->module_init, mod->init_text_size)
2940 && !within(addr, mod->module_core, mod->core_text_size))
2945 EXPORT_SYMBOL_GPL(__module_text_address);
2947 /* Don't grab lock, we're oopsing. */
2948 void print_modules(void)
2953 printk(KERN_DEFAULT "Modules linked in:");
2954 /* Most callers should already have preempt disabled, but make sure */
2956 list_for_each_entry_rcu(mod, &modules, list)
2957 printk(" %s%s", mod->name, module_flags(mod, buf));
2959 if (last_unloaded_module[0])
2960 printk(" [last unloaded: %s]", last_unloaded_module);
2964 #ifdef CONFIG_MODVERSIONS
2965 /* Generate the signature for all relevant module structures here.
2966 * If these change, we don't want to try to parse the module. */
2967 void module_layout(struct module *mod,
2968 struct modversion_info *ver,
2969 struct kernel_param *kp,
2970 struct kernel_symbol *ks,
2971 struct tracepoint *tp)
2974 EXPORT_SYMBOL(module_layout);
2977 #ifdef CONFIG_TRACEPOINTS
2978 void module_update_tracepoints(void)
2982 mutex_lock(&module_mutex);
2983 list_for_each_entry(mod, &modules, list)
2985 tracepoint_update_probe_range(mod->tracepoints,
2986 mod->tracepoints + mod->num_tracepoints);
2987 mutex_unlock(&module_mutex);
2991 * Returns 0 if current not found.
2992 * Returns 1 if current found.
2994 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2996 struct module *iter_mod;
2999 mutex_lock(&module_mutex);
3000 list_for_each_entry(iter_mod, &modules, list) {
3001 if (!iter_mod->taints) {
3003 * Sorted module list
3005 if (iter_mod < iter->module)
3007 else if (iter_mod > iter->module)
3008 iter->tracepoint = NULL;
3009 found = tracepoint_get_iter_range(&iter->tracepoint,
3010 iter_mod->tracepoints,
3011 iter_mod->tracepoints
3012 + iter_mod->num_tracepoints);
3014 iter->module = iter_mod;
3019 mutex_unlock(&module_mutex);