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 inline void __percpu *mod_percpu(struct module *mod)
378 static int percpu_modalloc(struct module *mod,
379 unsigned long size, unsigned long align)
381 if (align > PAGE_SIZE) {
382 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
383 mod->name, align, PAGE_SIZE);
387 mod->percpu = __alloc_reserved_percpu(size, align);
390 "Could not allocate %lu bytes percpu data\n", size);
393 mod->percpu_size = size;
397 static void percpu_modfree(struct module *mod)
399 free_percpu(mod->percpu);
402 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
404 const char *secstrings)
406 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
409 static void percpu_modcopy(struct module *mod,
410 const void *from, unsigned long size)
414 for_each_possible_cpu(cpu)
415 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
418 #else /* ... !CONFIG_SMP */
420 static inline void __percpu *mod_percpu(struct module *mod)
424 static inline int percpu_modalloc(struct module *mod,
425 unsigned long size, unsigned long align)
429 static inline void percpu_modfree(struct module *mod)
432 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
434 const char *secstrings)
438 static inline void percpu_modcopy(struct module *mod,
439 const void *from, unsigned long size)
441 /* pcpusec should be 0, and size of that section should be 0. */
445 #endif /* CONFIG_SMP */
447 #define MODINFO_ATTR(field) \
448 static void setup_modinfo_##field(struct module *mod, const char *s) \
450 mod->field = kstrdup(s, GFP_KERNEL); \
452 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
453 struct module *mod, char *buffer) \
455 return sprintf(buffer, "%s\n", mod->field); \
457 static int modinfo_##field##_exists(struct module *mod) \
459 return mod->field != NULL; \
461 static void free_modinfo_##field(struct module *mod) \
466 static struct module_attribute modinfo_##field = { \
467 .attr = { .name = __stringify(field), .mode = 0444 }, \
468 .show = show_modinfo_##field, \
469 .setup = setup_modinfo_##field, \
470 .test = modinfo_##field##_exists, \
471 .free = free_modinfo_##field, \
474 MODINFO_ATTR(version);
475 MODINFO_ATTR(srcversion);
477 static char last_unloaded_module[MODULE_NAME_LEN+1];
479 #ifdef CONFIG_MODULE_UNLOAD
480 /* Init the unload section of the module. */
481 static void module_unload_init(struct module *mod)
485 INIT_LIST_HEAD(&mod->modules_which_use_me);
486 for_each_possible_cpu(cpu)
487 per_cpu_ptr(mod->refptr, cpu)->count = 0;
489 /* Hold reference count during initialization. */
490 __this_cpu_write(mod->refptr->count, 1);
491 /* Backwards compatibility macros put refcount during init. */
492 mod->waiter = current;
495 /* modules using other modules */
498 struct list_head list;
499 struct module *module_which_uses;
502 /* Does a already use b? */
503 static int already_uses(struct module *a, struct module *b)
505 struct module_use *use;
507 list_for_each_entry(use, &b->modules_which_use_me, list) {
508 if (use->module_which_uses == a) {
509 DEBUGP("%s uses %s!\n", a->name, b->name);
513 DEBUGP("%s does not use %s!\n", a->name, b->name);
517 /* Module a uses b */
518 int use_module(struct module *a, struct module *b)
520 struct module_use *use;
523 if (b == NULL || already_uses(a, b)) return 1;
525 /* If we're interrupted or time out, we fail. */
526 if (wait_event_interruptible_timeout(
527 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
529 printk("%s: gave up waiting for init of module %s.\n",
534 /* If strong_try_module_get() returned a different error, we fail. */
538 DEBUGP("Allocating new usage for %s.\n", a->name);
539 use = kmalloc(sizeof(*use), GFP_ATOMIC);
541 printk("%s: out of memory loading\n", a->name);
546 use->module_which_uses = a;
547 list_add(&use->list, &b->modules_which_use_me);
548 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
551 EXPORT_SYMBOL_GPL(use_module);
553 /* Clear the unload stuff of the module. */
554 static void module_unload_free(struct module *mod)
558 list_for_each_entry(i, &modules, list) {
559 struct module_use *use;
561 list_for_each_entry(use, &i->modules_which_use_me, list) {
562 if (use->module_which_uses == mod) {
563 DEBUGP("%s unusing %s\n", mod->name, i->name);
565 list_del(&use->list);
567 sysfs_remove_link(i->holders_dir, mod->name);
568 /* There can be at most one match. */
575 #ifdef CONFIG_MODULE_FORCE_UNLOAD
576 static inline int try_force_unload(unsigned int flags)
578 int ret = (flags & O_TRUNC);
580 add_taint(TAINT_FORCED_RMMOD);
584 static inline int try_force_unload(unsigned int flags)
588 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
597 /* Whole machine is stopped with interrupts off when this runs. */
598 static int __try_stop_module(void *_sref)
600 struct stopref *sref = _sref;
602 /* If it's not unused, quit unless we're forcing. */
603 if (module_refcount(sref->mod) != 0) {
604 if (!(*sref->forced = try_force_unload(sref->flags)))
608 /* Mark it as dying. */
609 sref->mod->state = MODULE_STATE_GOING;
613 static int try_stop_module(struct module *mod, int flags, int *forced)
615 if (flags & O_NONBLOCK) {
616 struct stopref sref = { mod, flags, forced };
618 return stop_machine(__try_stop_module, &sref, NULL);
620 /* We don't need to stop the machine for this. */
621 mod->state = MODULE_STATE_GOING;
627 unsigned int module_refcount(struct module *mod)
629 unsigned int total = 0;
632 for_each_possible_cpu(cpu)
633 total += per_cpu_ptr(mod->refptr, cpu)->count;
636 EXPORT_SYMBOL(module_refcount);
638 /* This exists whether we can unload or not */
639 static void free_module(struct module *mod);
641 static void wait_for_zero_refcount(struct module *mod)
643 /* Since we might sleep for some time, release the mutex first */
644 mutex_unlock(&module_mutex);
646 DEBUGP("Looking at refcount...\n");
647 set_current_state(TASK_UNINTERRUPTIBLE);
648 if (module_refcount(mod) == 0)
652 current->state = TASK_RUNNING;
653 mutex_lock(&module_mutex);
656 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
660 char name[MODULE_NAME_LEN];
663 if (!capable(CAP_SYS_MODULE) || modules_disabled)
666 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
668 name[MODULE_NAME_LEN-1] = '\0';
670 /* Create stop_machine threads since free_module relies on
671 * a non-failing stop_machine call. */
672 ret = stop_machine_create();
676 if (mutex_lock_interruptible(&module_mutex) != 0) {
681 mod = find_module(name);
687 if (!list_empty(&mod->modules_which_use_me)) {
688 /* Other modules depend on us: get rid of them first. */
693 /* Doing init or already dying? */
694 if (mod->state != MODULE_STATE_LIVE) {
695 /* FIXME: if (force), slam module count and wake up
697 DEBUGP("%s already dying\n", mod->name);
702 /* If it has an init func, it must have an exit func to unload */
703 if (mod->init && !mod->exit) {
704 forced = try_force_unload(flags);
706 /* This module can't be removed */
712 /* Set this up before setting mod->state */
713 mod->waiter = current;
715 /* Stop the machine so refcounts can't move and disable module. */
716 ret = try_stop_module(mod, flags, &forced);
720 /* Never wait if forced. */
721 if (!forced && module_refcount(mod) != 0)
722 wait_for_zero_refcount(mod);
724 mutex_unlock(&module_mutex);
725 /* Final destruction now noone is using it. */
726 if (mod->exit != NULL)
728 blocking_notifier_call_chain(&module_notify_list,
729 MODULE_STATE_GOING, mod);
730 async_synchronize_full();
731 mutex_lock(&module_mutex);
732 /* Store the name of the last unloaded module for diagnostic purposes */
733 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
734 ddebug_remove_module(mod->name);
738 mutex_unlock(&module_mutex);
740 stop_machine_destroy();
744 static inline void print_unload_info(struct seq_file *m, struct module *mod)
746 struct module_use *use;
747 int printed_something = 0;
749 seq_printf(m, " %u ", module_refcount(mod));
751 /* Always include a trailing , so userspace can differentiate
752 between this and the old multi-field proc format. */
753 list_for_each_entry(use, &mod->modules_which_use_me, list) {
754 printed_something = 1;
755 seq_printf(m, "%s,", use->module_which_uses->name);
758 if (mod->init != NULL && mod->exit == NULL) {
759 printed_something = 1;
760 seq_printf(m, "[permanent],");
763 if (!printed_something)
767 void __symbol_put(const char *symbol)
769 struct module *owner;
772 if (!find_symbol(symbol, &owner, NULL, true, false))
777 EXPORT_SYMBOL(__symbol_put);
779 /* Note this assumes addr is a function, which it currently always is. */
780 void symbol_put_addr(void *addr)
782 struct module *modaddr;
783 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
785 if (core_kernel_text(a))
788 /* module_text_address is safe here: we're supposed to have reference
789 * to module from symbol_get, so it can't go away. */
790 modaddr = __module_text_address(a);
794 EXPORT_SYMBOL_GPL(symbol_put_addr);
796 static ssize_t show_refcnt(struct module_attribute *mattr,
797 struct module *mod, char *buffer)
799 return sprintf(buffer, "%u\n", module_refcount(mod));
802 static struct module_attribute refcnt = {
803 .attr = { .name = "refcnt", .mode = 0444 },
807 void module_put(struct module *module)
811 __this_cpu_dec(module->refptr->count);
813 trace_module_put(module, _RET_IP_,
814 __this_cpu_read(module->refptr->count));
815 /* Maybe they're waiting for us to drop reference? */
816 if (unlikely(!module_is_live(module)))
817 wake_up_process(module->waiter);
821 EXPORT_SYMBOL(module_put);
823 #else /* !CONFIG_MODULE_UNLOAD */
824 static inline void print_unload_info(struct seq_file *m, struct module *mod)
826 /* We don't know the usage count, or what modules are using. */
827 seq_printf(m, " - -");
830 static inline void module_unload_free(struct module *mod)
834 int use_module(struct module *a, struct module *b)
836 return strong_try_module_get(b) == 0;
838 EXPORT_SYMBOL_GPL(use_module);
840 static inline void module_unload_init(struct module *mod)
843 #endif /* CONFIG_MODULE_UNLOAD */
845 static ssize_t show_initstate(struct module_attribute *mattr,
846 struct module *mod, char *buffer)
848 const char *state = "unknown";
850 switch (mod->state) {
851 case MODULE_STATE_LIVE:
854 case MODULE_STATE_COMING:
857 case MODULE_STATE_GOING:
861 return sprintf(buffer, "%s\n", state);
864 static struct module_attribute initstate = {
865 .attr = { .name = "initstate", .mode = 0444 },
866 .show = show_initstate,
869 static struct module_attribute *modinfo_attrs[] = {
873 #ifdef CONFIG_MODULE_UNLOAD
879 static const char vermagic[] = VERMAGIC_STRING;
881 static int try_to_force_load(struct module *mod, const char *reason)
883 #ifdef CONFIG_MODULE_FORCE_LOAD
884 if (!test_taint(TAINT_FORCED_MODULE))
885 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
887 add_taint_module(mod, TAINT_FORCED_MODULE);
894 #ifdef CONFIG_MODVERSIONS
895 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
896 static unsigned long maybe_relocated(unsigned long crc,
897 const struct module *crc_owner)
899 #ifdef ARCH_RELOCATES_KCRCTAB
900 if (crc_owner == NULL)
901 return crc - (unsigned long)reloc_start;
906 static int check_version(Elf_Shdr *sechdrs,
907 unsigned int versindex,
910 const unsigned long *crc,
911 const struct module *crc_owner)
913 unsigned int i, num_versions;
914 struct modversion_info *versions;
916 /* Exporting module didn't supply crcs? OK, we're already tainted. */
920 /* No versions at all? modprobe --force does this. */
922 return try_to_force_load(mod, symname) == 0;
924 versions = (void *) sechdrs[versindex].sh_addr;
925 num_versions = sechdrs[versindex].sh_size
926 / sizeof(struct modversion_info);
928 for (i = 0; i < num_versions; i++) {
929 if (strcmp(versions[i].name, symname) != 0)
932 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
934 DEBUGP("Found checksum %lX vs module %lX\n",
935 maybe_relocated(*crc, crc_owner), versions[i].crc);
939 printk(KERN_WARNING "%s: no symbol version for %s\n",
944 printk("%s: disagrees about version of symbol %s\n",
949 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
950 unsigned int versindex,
953 const unsigned long *crc;
955 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
958 return check_version(sechdrs, versindex, "module_layout", mod, crc,
962 /* First part is kernel version, which we ignore if module has crcs. */
963 static inline int same_magic(const char *amagic, const char *bmagic,
967 amagic += strcspn(amagic, " ");
968 bmagic += strcspn(bmagic, " ");
970 return strcmp(amagic, bmagic) == 0;
973 static inline int check_version(Elf_Shdr *sechdrs,
974 unsigned int versindex,
977 const unsigned long *crc,
978 const struct module *crc_owner)
983 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
984 unsigned int versindex,
990 static inline int same_magic(const char *amagic, const char *bmagic,
993 return strcmp(amagic, bmagic) == 0;
995 #endif /* CONFIG_MODVERSIONS */
997 /* Resolve a symbol for this module. I.e. if we find one, record usage.
998 Must be holding module_mutex. */
999 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
1000 unsigned int versindex,
1004 struct module *owner;
1005 const struct kernel_symbol *sym;
1006 const unsigned long *crc;
1008 sym = find_symbol(name, &owner, &crc,
1009 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1010 /* use_module can fail due to OOM,
1011 or module initialization or unloading */
1013 if (!check_version(sechdrs, versindex, name, mod, crc, owner)
1014 || !use_module(mod, owner))
1021 * /sys/module/foo/sections stuff
1022 * J. Corbet <corbet@lwn.net>
1024 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1026 static inline bool sect_empty(const Elf_Shdr *sect)
1028 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1031 struct module_sect_attr
1033 struct module_attribute mattr;
1035 unsigned long address;
1038 struct module_sect_attrs
1040 struct attribute_group grp;
1041 unsigned int nsections;
1042 struct module_sect_attr attrs[0];
1045 static ssize_t module_sect_show(struct module_attribute *mattr,
1046 struct module *mod, char *buf)
1048 struct module_sect_attr *sattr =
1049 container_of(mattr, struct module_sect_attr, mattr);
1050 return sprintf(buf, "0x%lx\n", sattr->address);
1053 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1055 unsigned int section;
1057 for (section = 0; section < sect_attrs->nsections; section++)
1058 kfree(sect_attrs->attrs[section].name);
1062 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1063 char *secstrings, Elf_Shdr *sechdrs)
1065 unsigned int nloaded = 0, i, size[2];
1066 struct module_sect_attrs *sect_attrs;
1067 struct module_sect_attr *sattr;
1068 struct attribute **gattr;
1070 /* Count loaded sections and allocate structures */
1071 for (i = 0; i < nsect; i++)
1072 if (!sect_empty(&sechdrs[i]))
1074 size[0] = ALIGN(sizeof(*sect_attrs)
1075 + nloaded * sizeof(sect_attrs->attrs[0]),
1076 sizeof(sect_attrs->grp.attrs[0]));
1077 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1078 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1079 if (sect_attrs == NULL)
1082 /* Setup section attributes. */
1083 sect_attrs->grp.name = "sections";
1084 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1086 sect_attrs->nsections = 0;
1087 sattr = §_attrs->attrs[0];
1088 gattr = §_attrs->grp.attrs[0];
1089 for (i = 0; i < nsect; i++) {
1090 if (sect_empty(&sechdrs[i]))
1092 sattr->address = sechdrs[i].sh_addr;
1093 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1095 if (sattr->name == NULL)
1097 sect_attrs->nsections++;
1098 sysfs_attr_init(&sattr->mattr.attr);
1099 sattr->mattr.show = module_sect_show;
1100 sattr->mattr.store = NULL;
1101 sattr->mattr.attr.name = sattr->name;
1102 sattr->mattr.attr.mode = S_IRUGO;
1103 *(gattr++) = &(sattr++)->mattr.attr;
1107 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1110 mod->sect_attrs = sect_attrs;
1113 free_sect_attrs(sect_attrs);
1116 static void remove_sect_attrs(struct module *mod)
1118 if (mod->sect_attrs) {
1119 sysfs_remove_group(&mod->mkobj.kobj,
1120 &mod->sect_attrs->grp);
1121 /* We are positive that no one is using any sect attrs
1122 * at this point. Deallocate immediately. */
1123 free_sect_attrs(mod->sect_attrs);
1124 mod->sect_attrs = NULL;
1129 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1132 struct module_notes_attrs {
1133 struct kobject *dir;
1135 struct bin_attribute attrs[0];
1138 static ssize_t module_notes_read(struct kobject *kobj,
1139 struct bin_attribute *bin_attr,
1140 char *buf, loff_t pos, size_t count)
1143 * The caller checked the pos and count against our size.
1145 memcpy(buf, bin_attr->private + pos, count);
1149 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1152 if (notes_attrs->dir) {
1154 sysfs_remove_bin_file(notes_attrs->dir,
1155 ¬es_attrs->attrs[i]);
1156 kobject_put(notes_attrs->dir);
1161 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1162 char *secstrings, Elf_Shdr *sechdrs)
1164 unsigned int notes, loaded, i;
1165 struct module_notes_attrs *notes_attrs;
1166 struct bin_attribute *nattr;
1168 /* failed to create section attributes, so can't create notes */
1169 if (!mod->sect_attrs)
1172 /* Count notes sections and allocate structures. */
1174 for (i = 0; i < nsect; i++)
1175 if (!sect_empty(&sechdrs[i]) &&
1176 (sechdrs[i].sh_type == SHT_NOTE))
1182 notes_attrs = kzalloc(sizeof(*notes_attrs)
1183 + notes * sizeof(notes_attrs->attrs[0]),
1185 if (notes_attrs == NULL)
1188 notes_attrs->notes = notes;
1189 nattr = ¬es_attrs->attrs[0];
1190 for (loaded = i = 0; i < nsect; ++i) {
1191 if (sect_empty(&sechdrs[i]))
1193 if (sechdrs[i].sh_type == SHT_NOTE) {
1194 sysfs_bin_attr_init(nattr);
1195 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1196 nattr->attr.mode = S_IRUGO;
1197 nattr->size = sechdrs[i].sh_size;
1198 nattr->private = (void *) sechdrs[i].sh_addr;
1199 nattr->read = module_notes_read;
1205 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1206 if (!notes_attrs->dir)
1209 for (i = 0; i < notes; ++i)
1210 if (sysfs_create_bin_file(notes_attrs->dir,
1211 ¬es_attrs->attrs[i]))
1214 mod->notes_attrs = notes_attrs;
1218 free_notes_attrs(notes_attrs, i);
1221 static void remove_notes_attrs(struct module *mod)
1223 if (mod->notes_attrs)
1224 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1229 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1230 char *sectstrings, Elf_Shdr *sechdrs)
1234 static inline void remove_sect_attrs(struct module *mod)
1238 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1239 char *sectstrings, Elf_Shdr *sechdrs)
1243 static inline void remove_notes_attrs(struct module *mod)
1249 int module_add_modinfo_attrs(struct module *mod)
1251 struct module_attribute *attr;
1252 struct module_attribute *temp_attr;
1256 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1257 (ARRAY_SIZE(modinfo_attrs) + 1)),
1259 if (!mod->modinfo_attrs)
1262 temp_attr = mod->modinfo_attrs;
1263 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1265 (attr->test && attr->test(mod))) {
1266 memcpy(temp_attr, attr, sizeof(*temp_attr));
1267 sysfs_attr_init(&temp_attr->attr);
1268 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1275 void module_remove_modinfo_attrs(struct module *mod)
1277 struct module_attribute *attr;
1280 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1281 /* pick a field to test for end of list */
1282 if (!attr->attr.name)
1284 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1288 kfree(mod->modinfo_attrs);
1291 int mod_sysfs_init(struct module *mod)
1294 struct kobject *kobj;
1296 if (!module_sysfs_initialized) {
1297 printk(KERN_ERR "%s: module sysfs not initialized\n",
1303 kobj = kset_find_obj(module_kset, mod->name);
1305 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1311 mod->mkobj.mod = mod;
1313 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1314 mod->mkobj.kobj.kset = module_kset;
1315 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1318 kobject_put(&mod->mkobj.kobj);
1320 /* delay uevent until full sysfs population */
1325 int mod_sysfs_setup(struct module *mod,
1326 struct kernel_param *kparam,
1327 unsigned int num_params)
1331 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1332 if (!mod->holders_dir) {
1337 err = module_param_sysfs_setup(mod, kparam, num_params);
1339 goto out_unreg_holders;
1341 err = module_add_modinfo_attrs(mod);
1343 goto out_unreg_param;
1345 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1349 module_param_sysfs_remove(mod);
1351 kobject_put(mod->holders_dir);
1353 kobject_put(&mod->mkobj.kobj);
1357 static void mod_sysfs_fini(struct module *mod)
1359 kobject_put(&mod->mkobj.kobj);
1362 #else /* CONFIG_SYSFS */
1364 static void mod_sysfs_fini(struct module *mod)
1368 #endif /* CONFIG_SYSFS */
1370 static void mod_kobject_remove(struct module *mod)
1372 module_remove_modinfo_attrs(mod);
1373 module_param_sysfs_remove(mod);
1374 kobject_put(mod->mkobj.drivers_dir);
1375 kobject_put(mod->holders_dir);
1376 mod_sysfs_fini(mod);
1380 * unlink the module with the whole machine is stopped with interrupts off
1381 * - this defends against kallsyms not taking locks
1383 static int __unlink_module(void *_mod)
1385 struct module *mod = _mod;
1386 list_del(&mod->list);
1390 /* Free a module, remove from lists, etc (must hold module_mutex). */
1391 static void free_module(struct module *mod)
1393 trace_module_free(mod);
1395 /* Delete from various lists */
1396 stop_machine(__unlink_module, mod, NULL);
1397 remove_notes_attrs(mod);
1398 remove_sect_attrs(mod);
1399 mod_kobject_remove(mod);
1401 /* Arch-specific cleanup. */
1402 module_arch_cleanup(mod);
1404 /* Module unload stuff */
1405 module_unload_free(mod);
1407 /* Free any allocated parameters. */
1408 destroy_params(mod->kp, mod->num_kp);
1410 /* This may be NULL, but that's OK */
1411 module_free(mod, mod->module_init);
1413 percpu_modfree(mod);
1414 #if defined(CONFIG_MODULE_UNLOAD)
1416 free_percpu(mod->refptr);
1418 /* Free lock-classes: */
1419 lockdep_free_key_range(mod->module_core, mod->core_size);
1421 /* Finally, free the core (containing the module structure) */
1422 module_free(mod, mod->module_core);
1425 update_protections(current->mm);
1429 void *__symbol_get(const char *symbol)
1431 struct module *owner;
1432 const struct kernel_symbol *sym;
1435 sym = find_symbol(symbol, &owner, NULL, true, true);
1436 if (sym && strong_try_module_get(owner))
1440 return sym ? (void *)sym->value : NULL;
1442 EXPORT_SYMBOL_GPL(__symbol_get);
1445 * Ensure that an exported symbol [global namespace] does not already exist
1446 * in the kernel or in some other module's exported symbol table.
1448 static int verify_export_symbols(struct module *mod)
1451 struct module *owner;
1452 const struct kernel_symbol *s;
1454 const struct kernel_symbol *sym;
1457 { mod->syms, mod->num_syms },
1458 { mod->gpl_syms, mod->num_gpl_syms },
1459 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1460 #ifdef CONFIG_UNUSED_SYMBOLS
1461 { mod->unused_syms, mod->num_unused_syms },
1462 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1466 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1467 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1468 if (find_symbol(s->name, &owner, NULL, true, false)) {
1470 "%s: exports duplicate symbol %s"
1472 mod->name, s->name, module_name(owner));
1480 /* Change all symbols so that st_value encodes the pointer directly. */
1481 static int simplify_symbols(Elf_Shdr *sechdrs,
1482 unsigned int symindex,
1484 unsigned int versindex,
1485 unsigned int pcpuindex,
1488 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1489 unsigned long secbase;
1490 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1492 const struct kernel_symbol *ksym;
1494 for (i = 1; i < n; i++) {
1495 switch (sym[i].st_shndx) {
1497 /* We compiled with -fno-common. These are not
1498 supposed to happen. */
1499 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1500 printk("%s: please compile with -fno-common\n",
1506 /* Don't need to do anything */
1507 DEBUGP("Absolute symbol: 0x%08lx\n",
1508 (long)sym[i].st_value);
1512 ksym = resolve_symbol(sechdrs, versindex,
1513 strtab + sym[i].st_name, mod);
1514 /* Ok if resolved. */
1516 sym[i].st_value = ksym->value;
1521 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1524 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1525 mod->name, strtab + sym[i].st_name);
1530 /* Divert to percpu allocation if a percpu var. */
1531 if (sym[i].st_shndx == pcpuindex)
1532 secbase = (unsigned long)mod_percpu(mod);
1534 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1535 sym[i].st_value += secbase;
1543 /* Additional bytes needed by arch in front of individual sections */
1544 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1545 unsigned int section)
1547 /* default implementation just returns zero */
1551 /* Update size with this section: return offset. */
1552 static long get_offset(struct module *mod, unsigned int *size,
1553 Elf_Shdr *sechdr, unsigned int section)
1557 *size += arch_mod_section_prepend(mod, section);
1558 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1559 *size = ret + sechdr->sh_size;
1563 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1564 might -- code, read-only data, read-write data, small data. Tally
1565 sizes, and place the offsets into sh_entsize fields: high bit means it
1567 static void layout_sections(struct module *mod,
1568 const Elf_Ehdr *hdr,
1570 const char *secstrings)
1572 static unsigned long const masks[][2] = {
1573 /* NOTE: all executable code must be the first section
1574 * in this array; otherwise modify the text_size
1575 * finder in the two loops below */
1576 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1577 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1578 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1579 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1583 for (i = 0; i < hdr->e_shnum; i++)
1584 sechdrs[i].sh_entsize = ~0UL;
1586 DEBUGP("Core section allocation order:\n");
1587 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1588 for (i = 0; i < hdr->e_shnum; ++i) {
1589 Elf_Shdr *s = &sechdrs[i];
1591 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1592 || (s->sh_flags & masks[m][1])
1593 || s->sh_entsize != ~0UL
1594 || strstarts(secstrings + s->sh_name, ".init"))
1596 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1597 DEBUGP("\t%s\n", secstrings + s->sh_name);
1600 mod->core_text_size = mod->core_size;
1603 DEBUGP("Init section allocation order:\n");
1604 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1605 for (i = 0; i < hdr->e_shnum; ++i) {
1606 Elf_Shdr *s = &sechdrs[i];
1608 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1609 || (s->sh_flags & masks[m][1])
1610 || s->sh_entsize != ~0UL
1611 || !strstarts(secstrings + s->sh_name, ".init"))
1613 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1614 | INIT_OFFSET_MASK);
1615 DEBUGP("\t%s\n", secstrings + s->sh_name);
1618 mod->init_text_size = mod->init_size;
1622 static void set_license(struct module *mod, const char *license)
1625 license = "unspecified";
1627 if (!license_is_gpl_compatible(license)) {
1628 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1629 printk(KERN_WARNING "%s: module license '%s' taints "
1630 "kernel.\n", mod->name, license);
1631 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1635 /* Parse tag=value strings from .modinfo section */
1636 static char *next_string(char *string, unsigned long *secsize)
1638 /* Skip non-zero chars */
1641 if ((*secsize)-- <= 1)
1645 /* Skip any zero padding. */
1646 while (!string[0]) {
1648 if ((*secsize)-- <= 1)
1654 static char *get_modinfo(Elf_Shdr *sechdrs,
1659 unsigned int taglen = strlen(tag);
1660 unsigned long size = sechdrs[info].sh_size;
1662 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1663 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1664 return p + taglen + 1;
1669 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1670 unsigned int infoindex)
1672 struct module_attribute *attr;
1675 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1678 get_modinfo(sechdrs,
1684 static void free_modinfo(struct module *mod)
1686 struct module_attribute *attr;
1689 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1695 #ifdef CONFIG_KALLSYMS
1697 /* lookup symbol in given range of kernel_symbols */
1698 static const struct kernel_symbol *lookup_symbol(const char *name,
1699 const struct kernel_symbol *start,
1700 const struct kernel_symbol *stop)
1702 const struct kernel_symbol *ks = start;
1703 for (; ks < stop; ks++)
1704 if (strcmp(ks->name, name) == 0)
1709 static int is_exported(const char *name, unsigned long value,
1710 const struct module *mod)
1712 const struct kernel_symbol *ks;
1714 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1716 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1717 return ks != NULL && ks->value == value;
1721 static char elf_type(const Elf_Sym *sym,
1723 const char *secstrings,
1726 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1727 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1732 if (sym->st_shndx == SHN_UNDEF)
1734 if (sym->st_shndx == SHN_ABS)
1736 if (sym->st_shndx >= SHN_LORESERVE)
1738 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1740 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1741 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1742 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1744 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1749 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1750 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1755 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1760 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1763 const Elf_Shdr *sec;
1765 if (src->st_shndx == SHN_UNDEF
1766 || src->st_shndx >= shnum
1770 sec = sechdrs + src->st_shndx;
1771 if (!(sec->sh_flags & SHF_ALLOC)
1772 #ifndef CONFIG_KALLSYMS_ALL
1773 || !(sec->sh_flags & SHF_EXECINSTR)
1775 || (sec->sh_entsize & INIT_OFFSET_MASK))
1781 static unsigned long layout_symtab(struct module *mod,
1783 unsigned int symindex,
1784 unsigned int strindex,
1785 const Elf_Ehdr *hdr,
1786 const char *secstrings,
1787 unsigned long *pstroffs,
1788 unsigned long *strmap)
1790 unsigned long symoffs;
1791 Elf_Shdr *symsect = sechdrs + symindex;
1792 Elf_Shdr *strsect = sechdrs + strindex;
1795 unsigned int i, nsrc, ndst;
1797 /* Put symbol section at end of init part of module. */
1798 symsect->sh_flags |= SHF_ALLOC;
1799 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1800 symindex) | INIT_OFFSET_MASK;
1801 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1803 src = (void *)hdr + symsect->sh_offset;
1804 nsrc = symsect->sh_size / sizeof(*src);
1805 strtab = (void *)hdr + strsect->sh_offset;
1806 for (ndst = i = 1; i < nsrc; ++i, ++src)
1807 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1808 unsigned int j = src->st_name;
1810 while(!__test_and_set_bit(j, strmap) && strtab[j])
1815 /* Append room for core symbols at end of core part. */
1816 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1817 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1819 /* Put string table section at end of init part of module. */
1820 strsect->sh_flags |= SHF_ALLOC;
1821 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1822 strindex) | INIT_OFFSET_MASK;
1823 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1825 /* Append room for core symbols' strings at end of core part. */
1826 *pstroffs = mod->core_size;
1827 __set_bit(0, strmap);
1828 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1833 static void add_kallsyms(struct module *mod,
1836 unsigned int symindex,
1837 unsigned int strindex,
1838 unsigned long symoffs,
1839 unsigned long stroffs,
1840 const char *secstrings,
1841 unsigned long *strmap)
1843 unsigned int i, ndst;
1848 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1849 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1850 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1852 /* Set types up while we still have access to sections. */
1853 for (i = 0; i < mod->num_symtab; i++)
1854 mod->symtab[i].st_info
1855 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1857 mod->core_symtab = dst = mod->module_core + symoffs;
1860 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1861 if (!is_core_symbol(src, sechdrs, shnum))
1864 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
1867 mod->core_num_syms = ndst;
1869 mod->core_strtab = s = mod->module_core + stroffs;
1870 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1871 if (test_bit(i, strmap))
1872 *++s = mod->strtab[i];
1875 static inline unsigned long layout_symtab(struct module *mod,
1877 unsigned int symindex,
1878 unsigned int strindex,
1879 const Elf_Ehdr *hdr,
1880 const char *secstrings,
1881 unsigned long *pstroffs,
1882 unsigned long *strmap)
1887 static inline void add_kallsyms(struct module *mod,
1890 unsigned int symindex,
1891 unsigned int strindex,
1892 unsigned long symoffs,
1893 unsigned long stroffs,
1894 const char *secstrings,
1895 const unsigned long *strmap)
1898 #endif /* CONFIG_KALLSYMS */
1900 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1902 #ifdef CONFIG_DYNAMIC_DEBUG
1903 if (ddebug_add_module(debug, num, debug->modname))
1904 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1909 static void *module_alloc_update_bounds(unsigned long size)
1911 void *ret = module_alloc(size);
1914 /* Update module bounds. */
1915 if ((unsigned long)ret < module_addr_min)
1916 module_addr_min = (unsigned long)ret;
1917 if ((unsigned long)ret + size > module_addr_max)
1918 module_addr_max = (unsigned long)ret + size;
1923 #ifdef CONFIG_DEBUG_KMEMLEAK
1924 static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1925 Elf_Shdr *sechdrs, char *secstrings)
1929 /* only scan the sections containing data */
1930 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
1932 for (i = 1; i < hdr->e_shnum; i++) {
1933 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1935 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
1936 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
1939 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
1940 sechdrs[i].sh_size, GFP_KERNEL);
1944 static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1945 Elf_Shdr *sechdrs, char *secstrings)
1950 /* Allocate and load the module: note that size of section 0 is always
1951 zero, and we rely on this for optional sections. */
1952 static noinline struct module *load_module(void __user *umod,
1954 const char __user *uargs)
1958 char *secstrings, *args, *modmagic, *strtab = NULL;
1961 unsigned int symindex = 0;
1962 unsigned int strindex = 0;
1963 unsigned int modindex, versindex, infoindex, pcpuindex;
1966 void *ptr = NULL; /* Stops spurious gcc warning */
1967 unsigned long symoffs, stroffs, *strmap;
1969 mm_segment_t old_fs;
1971 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1973 if (len < sizeof(*hdr))
1974 return ERR_PTR(-ENOEXEC);
1976 /* Suck in entire file: we'll want most of it. */
1977 /* vmalloc barfs on "unusual" numbers. Check here */
1978 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1979 return ERR_PTR(-ENOMEM);
1981 if (copy_from_user(hdr, umod, len) != 0) {
1986 /* Sanity checks against insmoding binaries or wrong arch,
1987 weird elf version */
1988 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1989 || hdr->e_type != ET_REL
1990 || !elf_check_arch(hdr)
1991 || hdr->e_shentsize != sizeof(*sechdrs)) {
1996 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1999 /* Convenience variables */
2000 sechdrs = (void *)hdr + hdr->e_shoff;
2001 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
2002 sechdrs[0].sh_addr = 0;
2004 for (i = 1; i < hdr->e_shnum; i++) {
2005 if (sechdrs[i].sh_type != SHT_NOBITS
2006 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
2009 /* Mark all sections sh_addr with their address in the
2011 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
2013 /* Internal symbols and strings. */
2014 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2016 strindex = sechdrs[i].sh_link;
2017 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2019 #ifndef CONFIG_MODULE_UNLOAD
2020 /* Don't load .exit sections */
2021 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
2022 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2026 modindex = find_sec(hdr, sechdrs, secstrings,
2027 ".gnu.linkonce.this_module");
2029 printk(KERN_WARNING "No module found in object\n");
2033 /* This is temporary: point mod into copy of data. */
2034 mod = (void *)sechdrs[modindex].sh_addr;
2036 if (symindex == 0) {
2037 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2043 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2044 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2045 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2047 /* Don't keep modinfo and version sections. */
2048 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2049 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2051 /* Check module struct version now, before we try to use module. */
2052 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2057 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2058 /* This is allowed: modprobe --force will invalidate it. */
2060 err = try_to_force_load(mod, "bad vermagic");
2063 } else if (!same_magic(modmagic, vermagic, versindex)) {
2064 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2065 mod->name, modmagic, vermagic);
2070 staging = get_modinfo(sechdrs, infoindex, "staging");
2072 add_taint_module(mod, TAINT_CRAP);
2073 printk(KERN_WARNING "%s: module is from the staging directory,"
2074 " the quality is unknown, you have been warned.\n",
2078 /* Now copy in args */
2079 args = strndup_user(uargs, ~0UL >> 1);
2081 err = PTR_ERR(args);
2085 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2086 * sizeof(long), GFP_KERNEL);
2092 if (find_module(mod->name)) {
2097 mod->state = MODULE_STATE_COMING;
2099 /* Allow arches to frob section contents and sizes. */
2100 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2105 /* We have a special allocation for this section. */
2106 err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size,
2107 sechdrs[pcpuindex].sh_addralign);
2110 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2113 /* Determine total sizes, and put offsets in sh_entsize. For now
2114 this is done generically; there doesn't appear to be any
2115 special cases for the architectures. */
2116 layout_sections(mod, hdr, sechdrs, secstrings);
2117 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2118 secstrings, &stroffs, strmap);
2120 /* Do the allocs. */
2121 ptr = module_alloc_update_bounds(mod->core_size);
2123 * The pointer to this block is stored in the module structure
2124 * which is inside the block. Just mark it as not being a
2127 kmemleak_not_leak(ptr);
2132 memset(ptr, 0, mod->core_size);
2133 mod->module_core = ptr;
2135 ptr = module_alloc_update_bounds(mod->init_size);
2137 * The pointer to this block is stored in the module structure
2138 * which is inside the block. This block doesn't need to be
2139 * scanned as it contains data and code that will be freed
2140 * after the module is initialized.
2142 kmemleak_ignore(ptr);
2143 if (!ptr && mod->init_size) {
2147 memset(ptr, 0, mod->init_size);
2148 mod->module_init = ptr;
2150 /* Transfer each section which specifies SHF_ALLOC */
2151 DEBUGP("final section addresses:\n");
2152 for (i = 0; i < hdr->e_shnum; i++) {
2155 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2158 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2159 dest = mod->module_init
2160 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2162 dest = mod->module_core + sechdrs[i].sh_entsize;
2164 if (sechdrs[i].sh_type != SHT_NOBITS)
2165 memcpy(dest, (void *)sechdrs[i].sh_addr,
2166 sechdrs[i].sh_size);
2167 /* Update sh_addr to point to copy in image. */
2168 sechdrs[i].sh_addr = (unsigned long)dest;
2169 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2171 /* Module has been moved. */
2172 mod = (void *)sechdrs[modindex].sh_addr;
2173 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2175 #if defined(CONFIG_MODULE_UNLOAD)
2176 mod->refptr = alloc_percpu(struct module_ref);
2182 /* Now we've moved module, initialize linked lists, etc. */
2183 module_unload_init(mod);
2185 /* add kobject, so we can reference it. */
2186 err = mod_sysfs_init(mod);
2190 /* Set up license info based on the info section */
2191 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2194 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2195 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2196 * using GPL-only symbols it needs.
2198 if (strcmp(mod->name, "ndiswrapper") == 0)
2199 add_taint(TAINT_PROPRIETARY_MODULE);
2201 /* driverloader was caught wrongly pretending to be under GPL */
2202 if (strcmp(mod->name, "driverloader") == 0)
2203 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2205 /* Set up MODINFO_ATTR fields */
2206 setup_modinfo(mod, sechdrs, infoindex);
2208 /* Fix up syms, so that st_value is a pointer to location. */
2209 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2214 /* Now we've got everything in the final locations, we can
2215 * find optional sections. */
2216 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2217 sizeof(*mod->kp), &mod->num_kp);
2218 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2219 sizeof(*mod->syms), &mod->num_syms);
2220 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2221 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2222 sizeof(*mod->gpl_syms),
2223 &mod->num_gpl_syms);
2224 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2225 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2226 "__ksymtab_gpl_future",
2227 sizeof(*mod->gpl_future_syms),
2228 &mod->num_gpl_future_syms);
2229 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2230 "__kcrctab_gpl_future");
2232 #ifdef CONFIG_UNUSED_SYMBOLS
2233 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2235 sizeof(*mod->unused_syms),
2236 &mod->num_unused_syms);
2237 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2238 "__kcrctab_unused");
2239 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2240 "__ksymtab_unused_gpl",
2241 sizeof(*mod->unused_gpl_syms),
2242 &mod->num_unused_gpl_syms);
2243 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2244 "__kcrctab_unused_gpl");
2246 #ifdef CONFIG_CONSTRUCTORS
2247 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2248 sizeof(*mod->ctors), &mod->num_ctors);
2251 #ifdef CONFIG_TRACEPOINTS
2252 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2254 sizeof(*mod->tracepoints),
2255 &mod->num_tracepoints);
2257 #ifdef CONFIG_EVENT_TRACING
2258 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2260 sizeof(*mod->trace_events),
2261 &mod->num_trace_events);
2263 * This section contains pointers to allocated objects in the trace
2264 * code and not scanning it leads to false positives.
2266 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2267 mod->num_trace_events, GFP_KERNEL);
2269 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2270 /* sechdrs[0].sh_size is always zero */
2271 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2273 sizeof(*mod->ftrace_callsites),
2274 &mod->num_ftrace_callsites);
2276 #ifdef CONFIG_MODVERSIONS
2277 if ((mod->num_syms && !mod->crcs)
2278 || (mod->num_gpl_syms && !mod->gpl_crcs)
2279 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2280 #ifdef CONFIG_UNUSED_SYMBOLS
2281 || (mod->num_unused_syms && !mod->unused_crcs)
2282 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2285 err = try_to_force_load(mod,
2286 "no versions for exported symbols");
2292 /* Now do relocations. */
2293 for (i = 1; i < hdr->e_shnum; i++) {
2294 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2295 unsigned int info = sechdrs[i].sh_info;
2297 /* Not a valid relocation section? */
2298 if (info >= hdr->e_shnum)
2301 /* Don't bother with non-allocated sections */
2302 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2305 if (sechdrs[i].sh_type == SHT_REL)
2306 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2307 else if (sechdrs[i].sh_type == SHT_RELA)
2308 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2314 /* Find duplicate symbols */
2315 err = verify_export_symbols(mod);
2319 /* Set up and sort exception table */
2320 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2321 sizeof(*mod->extable), &mod->num_exentries);
2322 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2324 /* Finally, copy percpu area over. */
2325 percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr,
2326 sechdrs[pcpuindex].sh_size);
2328 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2329 symoffs, stroffs, secstrings, strmap);
2334 struct _ddebug *debug;
2335 unsigned int num_debug;
2337 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2338 sizeof(*debug), &num_debug);
2340 dynamic_debug_setup(debug, num_debug);
2343 err = module_finalize(hdr, sechdrs, mod);
2347 /* flush the icache in correct context */
2352 * Flush the instruction cache, since we've played with text.
2353 * Do it before processing of module parameters, so the module
2354 * can provide parameter accessor functions of its own.
2356 if (mod->module_init)
2357 flush_icache_range((unsigned long)mod->module_init,
2358 (unsigned long)mod->module_init
2360 flush_icache_range((unsigned long)mod->module_core,
2361 (unsigned long)mod->module_core + mod->core_size);
2366 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2367 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2370 /* Now sew it into the lists so we can get lockdep and oops
2371 * info during argument parsing. Noone should access us, since
2372 * strong_try_module_get() will fail.
2373 * lockdep/oops can run asynchronous, so use the RCU list insertion
2374 * function to insert in a way safe to concurrent readers.
2375 * The mutex protects against concurrent writers.
2377 list_add_rcu(&mod->list, &modules);
2379 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2383 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2386 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2387 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2389 /* Get rid of temporary copy */
2392 trace_module_load(mod);
2398 /* Unlink carefully: kallsyms could be walking list. */
2399 list_del_rcu(&mod->list);
2400 synchronize_sched();
2401 module_arch_cleanup(mod);
2404 kobject_del(&mod->mkobj.kobj);
2405 kobject_put(&mod->mkobj.kobj);
2407 module_unload_free(mod);
2408 #if defined(CONFIG_MODULE_UNLOAD)
2409 free_percpu(mod->refptr);
2412 module_free(mod, mod->module_init);
2414 module_free(mod, mod->module_core);
2415 /* mod will be freed with core. Don't access it beyond this line! */
2417 percpu_modfree(mod);
2423 return ERR_PTR(err);
2426 printk(KERN_ERR "Module len %lu truncated\n", len);
2431 /* Call module constructors. */
2432 static void do_mod_ctors(struct module *mod)
2434 #ifdef CONFIG_CONSTRUCTORS
2437 for (i = 0; i < mod->num_ctors; i++)
2442 /* This is where the real work happens */
2443 SYSCALL_DEFINE3(init_module, void __user *, umod,
2444 unsigned long, len, const char __user *, uargs)
2449 /* Must have permission */
2450 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2453 /* Only one module load at a time, please */
2454 if (mutex_lock_interruptible(&module_mutex) != 0)
2457 /* Do all the hard work */
2458 mod = load_module(umod, len, uargs);
2460 mutex_unlock(&module_mutex);
2461 return PTR_ERR(mod);
2464 /* Drop lock so they can recurse */
2465 mutex_unlock(&module_mutex);
2467 blocking_notifier_call_chain(&module_notify_list,
2468 MODULE_STATE_COMING, mod);
2471 /* Start the module */
2472 if (mod->init != NULL)
2473 ret = do_one_initcall(mod->init);
2475 /* Init routine failed: abort. Try to protect us from
2476 buggy refcounters. */
2477 mod->state = MODULE_STATE_GOING;
2478 synchronize_sched();
2480 blocking_notifier_call_chain(&module_notify_list,
2481 MODULE_STATE_GOING, mod);
2482 mutex_lock(&module_mutex);
2484 mutex_unlock(&module_mutex);
2485 wake_up(&module_wq);
2490 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2491 "%s: loading module anyway...\n",
2492 __func__, mod->name, ret,
2497 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2498 mod->state = MODULE_STATE_LIVE;
2499 wake_up(&module_wq);
2500 blocking_notifier_call_chain(&module_notify_list,
2501 MODULE_STATE_LIVE, mod);
2503 /* We need to finish all async code before the module init sequence is done */
2504 async_synchronize_full();
2506 mutex_lock(&module_mutex);
2507 /* Drop initial reference. */
2509 trim_init_extable(mod);
2510 #ifdef CONFIG_KALLSYMS
2511 mod->num_symtab = mod->core_num_syms;
2512 mod->symtab = mod->core_symtab;
2513 mod->strtab = mod->core_strtab;
2515 module_free(mod, mod->module_init);
2516 mod->module_init = NULL;
2518 mod->init_text_size = 0;
2519 mutex_unlock(&module_mutex);
2524 static inline int within(unsigned long addr, void *start, unsigned long size)
2526 return ((void *)addr >= start && (void *)addr < start + size);
2529 #ifdef CONFIG_KALLSYMS
2531 * This ignores the intensely annoying "mapping symbols" found
2532 * in ARM ELF files: $a, $t and $d.
2534 static inline int is_arm_mapping_symbol(const char *str)
2536 return str[0] == '$' && strchr("atd", str[1])
2537 && (str[2] == '\0' || str[2] == '.');
2540 static const char *get_ksymbol(struct module *mod,
2542 unsigned long *size,
2543 unsigned long *offset)
2545 unsigned int i, best = 0;
2546 unsigned long nextval;
2548 /* At worse, next value is at end of module */
2549 if (within_module_init(addr, mod))
2550 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2552 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2554 /* Scan for closest preceeding symbol, and next symbol. (ELF
2555 starts real symbols at 1). */
2556 for (i = 1; i < mod->num_symtab; i++) {
2557 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2560 /* We ignore unnamed symbols: they're uninformative
2561 * and inserted at a whim. */
2562 if (mod->symtab[i].st_value <= addr
2563 && mod->symtab[i].st_value > mod->symtab[best].st_value
2564 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2565 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2567 if (mod->symtab[i].st_value > addr
2568 && mod->symtab[i].st_value < nextval
2569 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2570 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2571 nextval = mod->symtab[i].st_value;
2578 *size = nextval - mod->symtab[best].st_value;
2580 *offset = addr - mod->symtab[best].st_value;
2581 return mod->strtab + mod->symtab[best].st_name;
2584 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2585 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2586 const char *module_address_lookup(unsigned long addr,
2587 unsigned long *size,
2588 unsigned long *offset,
2593 const char *ret = NULL;
2596 list_for_each_entry_rcu(mod, &modules, list) {
2597 if (within_module_init(addr, mod) ||
2598 within_module_core(addr, mod)) {
2600 *modname = mod->name;
2601 ret = get_ksymbol(mod, addr, size, offset);
2605 /* Make a copy in here where it's safe */
2607 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2614 int lookup_module_symbol_name(unsigned long addr, char *symname)
2619 list_for_each_entry_rcu(mod, &modules, list) {
2620 if (within_module_init(addr, mod) ||
2621 within_module_core(addr, mod)) {
2624 sym = get_ksymbol(mod, addr, NULL, NULL);
2627 strlcpy(symname, sym, KSYM_NAME_LEN);
2637 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2638 unsigned long *offset, char *modname, char *name)
2643 list_for_each_entry_rcu(mod, &modules, list) {
2644 if (within_module_init(addr, mod) ||
2645 within_module_core(addr, mod)) {
2648 sym = get_ksymbol(mod, addr, size, offset);
2652 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2654 strlcpy(name, sym, KSYM_NAME_LEN);
2664 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2665 char *name, char *module_name, int *exported)
2670 list_for_each_entry_rcu(mod, &modules, list) {
2671 if (symnum < mod->num_symtab) {
2672 *value = mod->symtab[symnum].st_value;
2673 *type = mod->symtab[symnum].st_info;
2674 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2676 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2677 *exported = is_exported(name, *value, mod);
2681 symnum -= mod->num_symtab;
2687 static unsigned long mod_find_symname(struct module *mod, const char *name)
2691 for (i = 0; i < mod->num_symtab; i++)
2692 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2693 mod->symtab[i].st_info != 'U')
2694 return mod->symtab[i].st_value;
2698 /* Look for this name: can be of form module:name. */
2699 unsigned long module_kallsyms_lookup_name(const char *name)
2703 unsigned long ret = 0;
2705 /* Don't lock: we're in enough trouble already. */
2707 if ((colon = strchr(name, ':')) != NULL) {
2709 if ((mod = find_module(name)) != NULL)
2710 ret = mod_find_symname(mod, colon+1);
2713 list_for_each_entry_rcu(mod, &modules, list)
2714 if ((ret = mod_find_symname(mod, name)) != 0)
2721 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2722 struct module *, unsigned long),
2729 list_for_each_entry(mod, &modules, list) {
2730 for (i = 0; i < mod->num_symtab; i++) {
2731 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2732 mod, mod->symtab[i].st_value);
2739 #endif /* CONFIG_KALLSYMS */
2741 static char *module_flags(struct module *mod, char *buf)
2746 mod->state == MODULE_STATE_GOING ||
2747 mod->state == MODULE_STATE_COMING) {
2749 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2751 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2753 if (mod->taints & (1 << TAINT_CRAP))
2756 * TAINT_FORCED_RMMOD: could be added.
2757 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2761 /* Show a - for module-is-being-unloaded */
2762 if (mod->state == MODULE_STATE_GOING)
2764 /* Show a + for module-is-being-loaded */
2765 if (mod->state == MODULE_STATE_COMING)
2774 #ifdef CONFIG_PROC_FS
2775 /* Called by the /proc file system to return a list of modules. */
2776 static void *m_start(struct seq_file *m, loff_t *pos)
2778 mutex_lock(&module_mutex);
2779 return seq_list_start(&modules, *pos);
2782 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2784 return seq_list_next(p, &modules, pos);
2787 static void m_stop(struct seq_file *m, void *p)
2789 mutex_unlock(&module_mutex);
2792 static int m_show(struct seq_file *m, void *p)
2794 struct module *mod = list_entry(p, struct module, list);
2797 seq_printf(m, "%s %u",
2798 mod->name, mod->init_size + mod->core_size);
2799 print_unload_info(m, mod);
2801 /* Informative for users. */
2802 seq_printf(m, " %s",
2803 mod->state == MODULE_STATE_GOING ? "Unloading":
2804 mod->state == MODULE_STATE_COMING ? "Loading":
2806 /* Used by oprofile and other similar tools. */
2807 seq_printf(m, " 0x%p", mod->module_core);
2811 seq_printf(m, " %s", module_flags(mod, buf));
2813 seq_printf(m, "\n");
2817 /* Format: modulename size refcount deps address
2819 Where refcount is a number or -, and deps is a comma-separated list
2822 static const struct seq_operations modules_op = {
2829 static int modules_open(struct inode *inode, struct file *file)
2831 return seq_open(file, &modules_op);
2834 static const struct file_operations proc_modules_operations = {
2835 .open = modules_open,
2837 .llseek = seq_lseek,
2838 .release = seq_release,
2841 static int __init proc_modules_init(void)
2843 proc_create("modules", 0, NULL, &proc_modules_operations);
2846 module_init(proc_modules_init);
2849 /* Given an address, look for it in the module exception tables. */
2850 const struct exception_table_entry *search_module_extables(unsigned long addr)
2852 const struct exception_table_entry *e = NULL;
2856 list_for_each_entry_rcu(mod, &modules, list) {
2857 if (mod->num_exentries == 0)
2860 e = search_extable(mod->extable,
2861 mod->extable + mod->num_exentries - 1,
2868 /* Now, if we found one, we are running inside it now, hence
2869 we cannot unload the module, hence no refcnt needed. */
2874 * is_module_address - is this address inside a module?
2875 * @addr: the address to check.
2877 * See is_module_text_address() if you simply want to see if the address
2878 * is code (not data).
2880 bool is_module_address(unsigned long addr)
2885 ret = __module_address(addr) != NULL;
2892 * __module_address - get the module which contains an address.
2893 * @addr: the address.
2895 * Must be called with preempt disabled or module mutex held so that
2896 * module doesn't get freed during this.
2898 struct module *__module_address(unsigned long addr)
2902 if (addr < module_addr_min || addr > module_addr_max)
2905 list_for_each_entry_rcu(mod, &modules, list)
2906 if (within_module_core(addr, mod)
2907 || within_module_init(addr, mod))
2911 EXPORT_SYMBOL_GPL(__module_address);
2914 * is_module_text_address - is this address inside module code?
2915 * @addr: the address to check.
2917 * See is_module_address() if you simply want to see if the address is
2918 * anywhere in a module. See kernel_text_address() for testing if an
2919 * address corresponds to kernel or module code.
2921 bool is_module_text_address(unsigned long addr)
2926 ret = __module_text_address(addr) != NULL;
2933 * __module_text_address - get the module whose code contains an address.
2934 * @addr: the address.
2936 * Must be called with preempt disabled or module mutex held so that
2937 * module doesn't get freed during this.
2939 struct module *__module_text_address(unsigned long addr)
2941 struct module *mod = __module_address(addr);
2943 /* Make sure it's within the text section. */
2944 if (!within(addr, mod->module_init, mod->init_text_size)
2945 && !within(addr, mod->module_core, mod->core_text_size))
2950 EXPORT_SYMBOL_GPL(__module_text_address);
2952 /* Don't grab lock, we're oopsing. */
2953 void print_modules(void)
2958 printk(KERN_DEFAULT "Modules linked in:");
2959 /* Most callers should already have preempt disabled, but make sure */
2961 list_for_each_entry_rcu(mod, &modules, list)
2962 printk(" %s%s", mod->name, module_flags(mod, buf));
2964 if (last_unloaded_module[0])
2965 printk(" [last unloaded: %s]", last_unloaded_module);
2969 #ifdef CONFIG_MODVERSIONS
2970 /* Generate the signature for all relevant module structures here.
2971 * If these change, we don't want to try to parse the module. */
2972 void module_layout(struct module *mod,
2973 struct modversion_info *ver,
2974 struct kernel_param *kp,
2975 struct kernel_symbol *ks,
2976 struct tracepoint *tp)
2979 EXPORT_SYMBOL(module_layout);
2982 #ifdef CONFIG_TRACEPOINTS
2983 void module_update_tracepoints(void)
2987 mutex_lock(&module_mutex);
2988 list_for_each_entry(mod, &modules, list)
2990 tracepoint_update_probe_range(mod->tracepoints,
2991 mod->tracepoints + mod->num_tracepoints);
2992 mutex_unlock(&module_mutex);
2996 * Returns 0 if current not found.
2997 * Returns 1 if current found.
2999 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
3001 struct module *iter_mod;
3004 mutex_lock(&module_mutex);
3005 list_for_each_entry(iter_mod, &modules, list) {
3006 if (!iter_mod->taints) {
3008 * Sorted module list
3010 if (iter_mod < iter->module)
3012 else if (iter_mod > iter->module)
3013 iter->tracepoint = NULL;
3014 found = tracepoint_get_iter_range(&iter->tracepoint,
3015 iter_mod->tracepoints,
3016 iter_mod->tracepoints
3017 + iter_mod->num_tracepoints);
3019 iter->module = iter_mod;
3024 mutex_unlock(&module_mutex);