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 __this_cpu_read(module->refptr->count));
805 /* Maybe they're waiting for us to drop reference? */
806 if (unlikely(!module_is_live(module)))
807 wake_up_process(module->waiter);
811 EXPORT_SYMBOL(module_put);
813 #else /* !CONFIG_MODULE_UNLOAD */
814 static inline void print_unload_info(struct seq_file *m, struct module *mod)
816 /* We don't know the usage count, or what modules are using. */
817 seq_printf(m, " - -");
820 static inline void module_unload_free(struct module *mod)
824 int use_module(struct module *a, struct module *b)
826 return strong_try_module_get(b) == 0;
828 EXPORT_SYMBOL_GPL(use_module);
830 static inline void module_unload_init(struct module *mod)
833 #endif /* CONFIG_MODULE_UNLOAD */
835 static ssize_t show_initstate(struct module_attribute *mattr,
836 struct module *mod, char *buffer)
838 const char *state = "unknown";
840 switch (mod->state) {
841 case MODULE_STATE_LIVE:
844 case MODULE_STATE_COMING:
847 case MODULE_STATE_GOING:
851 return sprintf(buffer, "%s\n", state);
854 static struct module_attribute initstate = {
855 .attr = { .name = "initstate", .mode = 0444 },
856 .show = show_initstate,
859 static struct module_attribute *modinfo_attrs[] = {
863 #ifdef CONFIG_MODULE_UNLOAD
869 static const char vermagic[] = VERMAGIC_STRING;
871 static int try_to_force_load(struct module *mod, const char *reason)
873 #ifdef CONFIG_MODULE_FORCE_LOAD
874 if (!test_taint(TAINT_FORCED_MODULE))
875 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
877 add_taint_module(mod, TAINT_FORCED_MODULE);
884 #ifdef CONFIG_MODVERSIONS
885 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
886 static unsigned long maybe_relocated(unsigned long crc,
887 const struct module *crc_owner)
889 #ifdef ARCH_RELOCATES_KCRCTAB
890 if (crc_owner == NULL)
891 return crc - (unsigned long)reloc_start;
896 static int check_version(Elf_Shdr *sechdrs,
897 unsigned int versindex,
900 const unsigned long *crc,
901 const struct module *crc_owner)
903 unsigned int i, num_versions;
904 struct modversion_info *versions;
906 /* Exporting module didn't supply crcs? OK, we're already tainted. */
910 /* No versions at all? modprobe --force does this. */
912 return try_to_force_load(mod, symname) == 0;
914 versions = (void *) sechdrs[versindex].sh_addr;
915 num_versions = sechdrs[versindex].sh_size
916 / sizeof(struct modversion_info);
918 for (i = 0; i < num_versions; i++) {
919 if (strcmp(versions[i].name, symname) != 0)
922 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
924 DEBUGP("Found checksum %lX vs module %lX\n",
925 maybe_relocated(*crc, crc_owner), versions[i].crc);
929 printk(KERN_WARNING "%s: no symbol version for %s\n",
934 printk("%s: disagrees about version of symbol %s\n",
939 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
940 unsigned int versindex,
943 const unsigned long *crc;
945 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
948 return check_version(sechdrs, versindex, "module_layout", mod, crc,
952 /* First part is kernel version, which we ignore if module has crcs. */
953 static inline int same_magic(const char *amagic, const char *bmagic,
957 amagic += strcspn(amagic, " ");
958 bmagic += strcspn(bmagic, " ");
960 return strcmp(amagic, bmagic) == 0;
963 static inline int check_version(Elf_Shdr *sechdrs,
964 unsigned int versindex,
967 const unsigned long *crc,
968 const struct module *crc_owner)
973 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
974 unsigned int versindex,
980 static inline int same_magic(const char *amagic, const char *bmagic,
983 return strcmp(amagic, bmagic) == 0;
985 #endif /* CONFIG_MODVERSIONS */
987 /* Resolve a symbol for this module. I.e. if we find one, record usage.
988 Must be holding module_mutex. */
989 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
990 unsigned int versindex,
994 struct module *owner;
995 const struct kernel_symbol *sym;
996 const unsigned long *crc;
998 sym = find_symbol(name, &owner, &crc,
999 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1000 /* use_module can fail due to OOM,
1001 or module initialization or unloading */
1003 if (!check_version(sechdrs, versindex, name, mod, crc, owner)
1004 || !use_module(mod, owner))
1011 * /sys/module/foo/sections stuff
1012 * J. Corbet <corbet@lwn.net>
1014 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1015 struct module_sect_attr
1017 struct module_attribute mattr;
1019 unsigned long address;
1022 struct module_sect_attrs
1024 struct attribute_group grp;
1025 unsigned int nsections;
1026 struct module_sect_attr attrs[0];
1029 static ssize_t module_sect_show(struct module_attribute *mattr,
1030 struct module *mod, char *buf)
1032 struct module_sect_attr *sattr =
1033 container_of(mattr, struct module_sect_attr, mattr);
1034 return sprintf(buf, "0x%lx\n", sattr->address);
1037 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1039 unsigned int section;
1041 for (section = 0; section < sect_attrs->nsections; section++)
1042 kfree(sect_attrs->attrs[section].name);
1046 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1047 char *secstrings, Elf_Shdr *sechdrs)
1049 unsigned int nloaded = 0, i, size[2];
1050 struct module_sect_attrs *sect_attrs;
1051 struct module_sect_attr *sattr;
1052 struct attribute **gattr;
1054 /* Count loaded sections and allocate structures */
1055 for (i = 0; i < nsect; i++)
1056 if (sechdrs[i].sh_flags & SHF_ALLOC
1057 && sechdrs[i].sh_size)
1059 size[0] = ALIGN(sizeof(*sect_attrs)
1060 + nloaded * sizeof(sect_attrs->attrs[0]),
1061 sizeof(sect_attrs->grp.attrs[0]));
1062 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1063 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1064 if (sect_attrs == NULL)
1067 /* Setup section attributes. */
1068 sect_attrs->grp.name = "sections";
1069 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1071 sect_attrs->nsections = 0;
1072 sattr = §_attrs->attrs[0];
1073 gattr = §_attrs->grp.attrs[0];
1074 for (i = 0; i < nsect; i++) {
1075 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1077 if (!sechdrs[i].sh_size)
1079 sattr->address = sechdrs[i].sh_addr;
1080 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1082 if (sattr->name == NULL)
1084 sect_attrs->nsections++;
1085 sattr->mattr.show = module_sect_show;
1086 sattr->mattr.store = NULL;
1087 sattr->mattr.attr.name = sattr->name;
1088 sattr->mattr.attr.mode = S_IRUGO;
1089 *(gattr++) = &(sattr++)->mattr.attr;
1093 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1096 mod->sect_attrs = sect_attrs;
1099 free_sect_attrs(sect_attrs);
1102 static void remove_sect_attrs(struct module *mod)
1104 if (mod->sect_attrs) {
1105 sysfs_remove_group(&mod->mkobj.kobj,
1106 &mod->sect_attrs->grp);
1107 /* We are positive that no one is using any sect attrs
1108 * at this point. Deallocate immediately. */
1109 free_sect_attrs(mod->sect_attrs);
1110 mod->sect_attrs = NULL;
1115 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1118 struct module_notes_attrs {
1119 struct kobject *dir;
1121 struct bin_attribute attrs[0];
1124 static ssize_t module_notes_read(struct kobject *kobj,
1125 struct bin_attribute *bin_attr,
1126 char *buf, loff_t pos, size_t count)
1129 * The caller checked the pos and count against our size.
1131 memcpy(buf, bin_attr->private + pos, count);
1135 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1138 if (notes_attrs->dir) {
1140 sysfs_remove_bin_file(notes_attrs->dir,
1141 ¬es_attrs->attrs[i]);
1142 kobject_put(notes_attrs->dir);
1147 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1148 char *secstrings, Elf_Shdr *sechdrs)
1150 unsigned int notes, loaded, i;
1151 struct module_notes_attrs *notes_attrs;
1152 struct bin_attribute *nattr;
1154 /* failed to create section attributes, so can't create notes */
1155 if (!mod->sect_attrs)
1158 /* Count notes sections and allocate structures. */
1160 for (i = 0; i < nsect; i++)
1161 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1162 (sechdrs[i].sh_type == SHT_NOTE))
1168 notes_attrs = kzalloc(sizeof(*notes_attrs)
1169 + notes * sizeof(notes_attrs->attrs[0]),
1171 if (notes_attrs == NULL)
1174 notes_attrs->notes = notes;
1175 nattr = ¬es_attrs->attrs[0];
1176 for (loaded = i = 0; i < nsect; ++i) {
1177 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1179 if (sechdrs[i].sh_type == SHT_NOTE) {
1180 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1181 nattr->attr.mode = S_IRUGO;
1182 nattr->size = sechdrs[i].sh_size;
1183 nattr->private = (void *) sechdrs[i].sh_addr;
1184 nattr->read = module_notes_read;
1190 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1191 if (!notes_attrs->dir)
1194 for (i = 0; i < notes; ++i)
1195 if (sysfs_create_bin_file(notes_attrs->dir,
1196 ¬es_attrs->attrs[i]))
1199 mod->notes_attrs = notes_attrs;
1203 free_notes_attrs(notes_attrs, i);
1206 static void remove_notes_attrs(struct module *mod)
1208 if (mod->notes_attrs)
1209 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1214 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1215 char *sectstrings, Elf_Shdr *sechdrs)
1219 static inline void remove_sect_attrs(struct module *mod)
1223 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1224 char *sectstrings, Elf_Shdr *sechdrs)
1228 static inline void remove_notes_attrs(struct module *mod)
1234 int module_add_modinfo_attrs(struct module *mod)
1236 struct module_attribute *attr;
1237 struct module_attribute *temp_attr;
1241 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1242 (ARRAY_SIZE(modinfo_attrs) + 1)),
1244 if (!mod->modinfo_attrs)
1247 temp_attr = mod->modinfo_attrs;
1248 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1250 (attr->test && attr->test(mod))) {
1251 memcpy(temp_attr, attr, sizeof(*temp_attr));
1252 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1259 void module_remove_modinfo_attrs(struct module *mod)
1261 struct module_attribute *attr;
1264 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1265 /* pick a field to test for end of list */
1266 if (!attr->attr.name)
1268 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1272 kfree(mod->modinfo_attrs);
1275 int mod_sysfs_init(struct module *mod)
1278 struct kobject *kobj;
1280 if (!module_sysfs_initialized) {
1281 printk(KERN_ERR "%s: module sysfs not initialized\n",
1287 kobj = kset_find_obj(module_kset, mod->name);
1289 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1295 mod->mkobj.mod = mod;
1297 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1298 mod->mkobj.kobj.kset = module_kset;
1299 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1302 kobject_put(&mod->mkobj.kobj);
1304 /* delay uevent until full sysfs population */
1309 int mod_sysfs_setup(struct module *mod,
1310 struct kernel_param *kparam,
1311 unsigned int num_params)
1315 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1316 if (!mod->holders_dir) {
1321 err = module_param_sysfs_setup(mod, kparam, num_params);
1323 goto out_unreg_holders;
1325 err = module_add_modinfo_attrs(mod);
1327 goto out_unreg_param;
1329 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1333 module_param_sysfs_remove(mod);
1335 kobject_put(mod->holders_dir);
1337 kobject_put(&mod->mkobj.kobj);
1341 static void mod_sysfs_fini(struct module *mod)
1343 kobject_put(&mod->mkobj.kobj);
1346 #else /* CONFIG_SYSFS */
1348 static void mod_sysfs_fini(struct module *mod)
1352 #endif /* CONFIG_SYSFS */
1354 static void mod_kobject_remove(struct module *mod)
1356 module_remove_modinfo_attrs(mod);
1357 module_param_sysfs_remove(mod);
1358 kobject_put(mod->mkobj.drivers_dir);
1359 kobject_put(mod->holders_dir);
1360 mod_sysfs_fini(mod);
1364 * unlink the module with the whole machine is stopped with interrupts off
1365 * - this defends against kallsyms not taking locks
1367 static int __unlink_module(void *_mod)
1369 struct module *mod = _mod;
1370 list_del(&mod->list);
1374 /* Free a module, remove from lists, etc (must hold module_mutex). */
1375 static void free_module(struct module *mod)
1377 trace_module_free(mod);
1379 /* Delete from various lists */
1380 stop_machine(__unlink_module, mod, NULL);
1381 remove_notes_attrs(mod);
1382 remove_sect_attrs(mod);
1383 mod_kobject_remove(mod);
1385 /* Arch-specific cleanup. */
1386 module_arch_cleanup(mod);
1388 /* Module unload stuff */
1389 module_unload_free(mod);
1391 /* Free any allocated parameters. */
1392 destroy_params(mod->kp, mod->num_kp);
1394 /* This may be NULL, but that's OK */
1395 module_free(mod, mod->module_init);
1398 percpu_modfree(mod->percpu);
1399 #if defined(CONFIG_MODULE_UNLOAD)
1401 free_percpu(mod->refptr);
1403 /* Free lock-classes: */
1404 lockdep_free_key_range(mod->module_core, mod->core_size);
1406 /* Finally, free the core (containing the module structure) */
1407 module_free(mod, mod->module_core);
1410 update_protections(current->mm);
1414 void *__symbol_get(const char *symbol)
1416 struct module *owner;
1417 const struct kernel_symbol *sym;
1420 sym = find_symbol(symbol, &owner, NULL, true, true);
1421 if (sym && strong_try_module_get(owner))
1425 return sym ? (void *)sym->value : NULL;
1427 EXPORT_SYMBOL_GPL(__symbol_get);
1430 * Ensure that an exported symbol [global namespace] does not already exist
1431 * in the kernel or in some other module's exported symbol table.
1433 static int verify_export_symbols(struct module *mod)
1436 struct module *owner;
1437 const struct kernel_symbol *s;
1439 const struct kernel_symbol *sym;
1442 { mod->syms, mod->num_syms },
1443 { mod->gpl_syms, mod->num_gpl_syms },
1444 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1445 #ifdef CONFIG_UNUSED_SYMBOLS
1446 { mod->unused_syms, mod->num_unused_syms },
1447 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1451 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1452 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1453 if (find_symbol(s->name, &owner, NULL, true, false)) {
1455 "%s: exports duplicate symbol %s"
1457 mod->name, s->name, module_name(owner));
1465 /* Change all symbols so that st_value encodes the pointer directly. */
1466 static int simplify_symbols(Elf_Shdr *sechdrs,
1467 unsigned int symindex,
1469 unsigned int versindex,
1470 unsigned int pcpuindex,
1473 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1474 unsigned long secbase;
1475 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1477 const struct kernel_symbol *ksym;
1479 for (i = 1; i < n; i++) {
1480 switch (sym[i].st_shndx) {
1482 /* We compiled with -fno-common. These are not
1483 supposed to happen. */
1484 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1485 printk("%s: please compile with -fno-common\n",
1491 /* Don't need to do anything */
1492 DEBUGP("Absolute symbol: 0x%08lx\n",
1493 (long)sym[i].st_value);
1497 ksym = resolve_symbol(sechdrs, versindex,
1498 strtab + sym[i].st_name, mod);
1499 /* Ok if resolved. */
1501 sym[i].st_value = ksym->value;
1506 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1509 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1510 mod->name, strtab + sym[i].st_name);
1515 /* Divert to percpu allocation if a percpu var. */
1516 if (sym[i].st_shndx == pcpuindex)
1517 secbase = (unsigned long)mod->percpu;
1519 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1520 sym[i].st_value += secbase;
1528 /* Additional bytes needed by arch in front of individual sections */
1529 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1530 unsigned int section)
1532 /* default implementation just returns zero */
1536 /* Update size with this section: return offset. */
1537 static long get_offset(struct module *mod, unsigned int *size,
1538 Elf_Shdr *sechdr, unsigned int section)
1542 *size += arch_mod_section_prepend(mod, section);
1543 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1544 *size = ret + sechdr->sh_size;
1548 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1549 might -- code, read-only data, read-write data, small data. Tally
1550 sizes, and place the offsets into sh_entsize fields: high bit means it
1552 static void layout_sections(struct module *mod,
1553 const Elf_Ehdr *hdr,
1555 const char *secstrings)
1557 static unsigned long const masks[][2] = {
1558 /* NOTE: all executable code must be the first section
1559 * in this array; otherwise modify the text_size
1560 * finder in the two loops below */
1561 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1562 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1563 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1564 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1568 for (i = 0; i < hdr->e_shnum; i++)
1569 sechdrs[i].sh_entsize = ~0UL;
1571 DEBUGP("Core section allocation order:\n");
1572 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1573 for (i = 0; i < hdr->e_shnum; ++i) {
1574 Elf_Shdr *s = &sechdrs[i];
1576 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1577 || (s->sh_flags & masks[m][1])
1578 || s->sh_entsize != ~0UL
1579 || strstarts(secstrings + s->sh_name, ".init"))
1581 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1582 DEBUGP("\t%s\n", secstrings + s->sh_name);
1585 mod->core_text_size = mod->core_size;
1588 DEBUGP("Init section allocation order:\n");
1589 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1590 for (i = 0; i < hdr->e_shnum; ++i) {
1591 Elf_Shdr *s = &sechdrs[i];
1593 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1594 || (s->sh_flags & masks[m][1])
1595 || s->sh_entsize != ~0UL
1596 || !strstarts(secstrings + s->sh_name, ".init"))
1598 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1599 | INIT_OFFSET_MASK);
1600 DEBUGP("\t%s\n", secstrings + s->sh_name);
1603 mod->init_text_size = mod->init_size;
1607 static void set_license(struct module *mod, const char *license)
1610 license = "unspecified";
1612 if (!license_is_gpl_compatible(license)) {
1613 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1614 printk(KERN_WARNING "%s: module license '%s' taints "
1615 "kernel.\n", mod->name, license);
1616 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1620 /* Parse tag=value strings from .modinfo section */
1621 static char *next_string(char *string, unsigned long *secsize)
1623 /* Skip non-zero chars */
1626 if ((*secsize)-- <= 1)
1630 /* Skip any zero padding. */
1631 while (!string[0]) {
1633 if ((*secsize)-- <= 1)
1639 static char *get_modinfo(Elf_Shdr *sechdrs,
1644 unsigned int taglen = strlen(tag);
1645 unsigned long size = sechdrs[info].sh_size;
1647 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1648 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1649 return p + taglen + 1;
1654 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1655 unsigned int infoindex)
1657 struct module_attribute *attr;
1660 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1663 get_modinfo(sechdrs,
1669 static void free_modinfo(struct module *mod)
1671 struct module_attribute *attr;
1674 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1680 #ifdef CONFIG_KALLSYMS
1682 /* lookup symbol in given range of kernel_symbols */
1683 static const struct kernel_symbol *lookup_symbol(const char *name,
1684 const struct kernel_symbol *start,
1685 const struct kernel_symbol *stop)
1687 const struct kernel_symbol *ks = start;
1688 for (; ks < stop; ks++)
1689 if (strcmp(ks->name, name) == 0)
1694 static int is_exported(const char *name, unsigned long value,
1695 const struct module *mod)
1697 const struct kernel_symbol *ks;
1699 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1701 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1702 return ks != NULL && ks->value == value;
1706 static char elf_type(const Elf_Sym *sym,
1708 const char *secstrings,
1711 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1712 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1717 if (sym->st_shndx == SHN_UNDEF)
1719 if (sym->st_shndx == SHN_ABS)
1721 if (sym->st_shndx >= SHN_LORESERVE)
1723 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1725 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1726 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1727 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1729 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1734 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1735 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1740 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1745 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1748 const Elf_Shdr *sec;
1750 if (src->st_shndx == SHN_UNDEF
1751 || src->st_shndx >= shnum
1755 sec = sechdrs + src->st_shndx;
1756 if (!(sec->sh_flags & SHF_ALLOC)
1757 #ifndef CONFIG_KALLSYMS_ALL
1758 || !(sec->sh_flags & SHF_EXECINSTR)
1760 || (sec->sh_entsize & INIT_OFFSET_MASK))
1766 static unsigned long layout_symtab(struct module *mod,
1768 unsigned int symindex,
1769 unsigned int strindex,
1770 const Elf_Ehdr *hdr,
1771 const char *secstrings,
1772 unsigned long *pstroffs,
1773 unsigned long *strmap)
1775 unsigned long symoffs;
1776 Elf_Shdr *symsect = sechdrs + symindex;
1777 Elf_Shdr *strsect = sechdrs + strindex;
1780 unsigned int i, nsrc, ndst;
1782 /* Put symbol section at end of init part of module. */
1783 symsect->sh_flags |= SHF_ALLOC;
1784 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1785 symindex) | INIT_OFFSET_MASK;
1786 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1788 src = (void *)hdr + symsect->sh_offset;
1789 nsrc = symsect->sh_size / sizeof(*src);
1790 strtab = (void *)hdr + strsect->sh_offset;
1791 for (ndst = i = 1; i < nsrc; ++i, ++src)
1792 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1793 unsigned int j = src->st_name;
1795 while(!__test_and_set_bit(j, strmap) && strtab[j])
1800 /* Append room for core symbols at end of core part. */
1801 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1802 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1804 /* Put string table section at end of init part of module. */
1805 strsect->sh_flags |= SHF_ALLOC;
1806 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1807 strindex) | INIT_OFFSET_MASK;
1808 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1810 /* Append room for core symbols' strings at end of core part. */
1811 *pstroffs = mod->core_size;
1812 __set_bit(0, strmap);
1813 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1818 static void add_kallsyms(struct module *mod,
1821 unsigned int symindex,
1822 unsigned int strindex,
1823 unsigned long symoffs,
1824 unsigned long stroffs,
1825 const char *secstrings,
1826 unsigned long *strmap)
1828 unsigned int i, ndst;
1833 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1834 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1835 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1837 /* Set types up while we still have access to sections. */
1838 for (i = 0; i < mod->num_symtab; i++)
1839 mod->symtab[i].st_info
1840 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1842 mod->core_symtab = dst = mod->module_core + symoffs;
1845 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1846 if (!is_core_symbol(src, sechdrs, shnum))
1849 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
1852 mod->core_num_syms = ndst;
1854 mod->core_strtab = s = mod->module_core + stroffs;
1855 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1856 if (test_bit(i, strmap))
1857 *++s = mod->strtab[i];
1860 static inline unsigned long layout_symtab(struct module *mod,
1862 unsigned int symindex,
1863 unsigned int strindex,
1864 const Elf_Ehdr *hdr,
1865 const char *secstrings,
1866 unsigned long *pstroffs,
1867 unsigned long *strmap)
1872 static inline void add_kallsyms(struct module *mod,
1875 unsigned int symindex,
1876 unsigned int strindex,
1877 unsigned long symoffs,
1878 unsigned long stroffs,
1879 const char *secstrings,
1880 const unsigned long *strmap)
1883 #endif /* CONFIG_KALLSYMS */
1885 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1887 #ifdef CONFIG_DYNAMIC_DEBUG
1888 if (ddebug_add_module(debug, num, debug->modname))
1889 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1894 static void *module_alloc_update_bounds(unsigned long size)
1896 void *ret = module_alloc(size);
1899 /* Update module bounds. */
1900 if ((unsigned long)ret < module_addr_min)
1901 module_addr_min = (unsigned long)ret;
1902 if ((unsigned long)ret + size > module_addr_max)
1903 module_addr_max = (unsigned long)ret + size;
1908 #ifdef CONFIG_DEBUG_KMEMLEAK
1909 static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1910 Elf_Shdr *sechdrs, char *secstrings)
1914 /* only scan the sections containing data */
1915 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
1917 for (i = 1; i < hdr->e_shnum; i++) {
1918 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1920 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
1921 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
1924 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
1925 sechdrs[i].sh_size, GFP_KERNEL);
1929 static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1930 Elf_Shdr *sechdrs, char *secstrings)
1935 /* Allocate and load the module: note that size of section 0 is always
1936 zero, and we rely on this for optional sections. */
1937 static noinline struct module *load_module(void __user *umod,
1939 const char __user *uargs)
1943 char *secstrings, *args, *modmagic, *strtab = NULL;
1946 unsigned int symindex = 0;
1947 unsigned int strindex = 0;
1948 unsigned int modindex, versindex, infoindex, pcpuindex;
1951 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1952 unsigned long symoffs, stroffs, *strmap;
1954 mm_segment_t old_fs;
1956 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1958 if (len < sizeof(*hdr))
1959 return ERR_PTR(-ENOEXEC);
1961 /* Suck in entire file: we'll want most of it. */
1962 /* vmalloc barfs on "unusual" numbers. Check here */
1963 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1964 return ERR_PTR(-ENOMEM);
1966 if (copy_from_user(hdr, umod, len) != 0) {
1971 /* Sanity checks against insmoding binaries or wrong arch,
1972 weird elf version */
1973 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1974 || hdr->e_type != ET_REL
1975 || !elf_check_arch(hdr)
1976 || hdr->e_shentsize != sizeof(*sechdrs)) {
1981 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1984 /* Convenience variables */
1985 sechdrs = (void *)hdr + hdr->e_shoff;
1986 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1987 sechdrs[0].sh_addr = 0;
1989 for (i = 1; i < hdr->e_shnum; i++) {
1990 if (sechdrs[i].sh_type != SHT_NOBITS
1991 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1994 /* Mark all sections sh_addr with their address in the
1996 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1998 /* Internal symbols and strings. */
1999 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2001 strindex = sechdrs[i].sh_link;
2002 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2004 #ifndef CONFIG_MODULE_UNLOAD
2005 /* Don't load .exit sections */
2006 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
2007 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2011 modindex = find_sec(hdr, sechdrs, secstrings,
2012 ".gnu.linkonce.this_module");
2014 printk(KERN_WARNING "No module found in object\n");
2018 /* This is temporary: point mod into copy of data. */
2019 mod = (void *)sechdrs[modindex].sh_addr;
2021 if (symindex == 0) {
2022 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2028 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2029 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2030 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2032 /* Don't keep modinfo and version sections. */
2033 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2034 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2036 /* Check module struct version now, before we try to use module. */
2037 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2042 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2043 /* This is allowed: modprobe --force will invalidate it. */
2045 err = try_to_force_load(mod, "bad vermagic");
2048 } else if (!same_magic(modmagic, vermagic, versindex)) {
2049 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2050 mod->name, modmagic, vermagic);
2055 staging = get_modinfo(sechdrs, infoindex, "staging");
2057 add_taint_module(mod, TAINT_CRAP);
2058 printk(KERN_WARNING "%s: module is from the staging directory,"
2059 " the quality is unknown, you have been warned.\n",
2063 /* Now copy in args */
2064 args = strndup_user(uargs, ~0UL >> 1);
2066 err = PTR_ERR(args);
2070 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2071 * sizeof(long), GFP_KERNEL);
2077 if (find_module(mod->name)) {
2082 mod->state = MODULE_STATE_COMING;
2084 /* Allow arches to frob section contents and sizes. */
2085 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2090 /* We have a special allocation for this section. */
2091 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2092 sechdrs[pcpuindex].sh_addralign,
2098 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2099 mod->percpu = percpu;
2102 /* Determine total sizes, and put offsets in sh_entsize. For now
2103 this is done generically; there doesn't appear to be any
2104 special cases for the architectures. */
2105 layout_sections(mod, hdr, sechdrs, secstrings);
2106 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2107 secstrings, &stroffs, strmap);
2109 /* Do the allocs. */
2110 ptr = module_alloc_update_bounds(mod->core_size);
2112 * The pointer to this block is stored in the module structure
2113 * which is inside the block. Just mark it as not being a
2116 kmemleak_not_leak(ptr);
2121 memset(ptr, 0, mod->core_size);
2122 mod->module_core = ptr;
2124 ptr = module_alloc_update_bounds(mod->init_size);
2126 * The pointer to this block is stored in the module structure
2127 * which is inside the block. This block doesn't need to be
2128 * scanned as it contains data and code that will be freed
2129 * after the module is initialized.
2131 kmemleak_ignore(ptr);
2132 if (!ptr && mod->init_size) {
2136 memset(ptr, 0, mod->init_size);
2137 mod->module_init = ptr;
2139 /* Transfer each section which specifies SHF_ALLOC */
2140 DEBUGP("final section addresses:\n");
2141 for (i = 0; i < hdr->e_shnum; i++) {
2144 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2147 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2148 dest = mod->module_init
2149 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2151 dest = mod->module_core + sechdrs[i].sh_entsize;
2153 if (sechdrs[i].sh_type != SHT_NOBITS)
2154 memcpy(dest, (void *)sechdrs[i].sh_addr,
2155 sechdrs[i].sh_size);
2156 /* Update sh_addr to point to copy in image. */
2157 sechdrs[i].sh_addr = (unsigned long)dest;
2158 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2160 /* Module has been moved. */
2161 mod = (void *)sechdrs[modindex].sh_addr;
2162 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2164 #if defined(CONFIG_MODULE_UNLOAD)
2165 mod->refptr = alloc_percpu(struct module_ref);
2171 /* Now we've moved module, initialize linked lists, etc. */
2172 module_unload_init(mod);
2174 /* add kobject, so we can reference it. */
2175 err = mod_sysfs_init(mod);
2179 /* Set up license info based on the info section */
2180 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2183 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2184 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2185 * using GPL-only symbols it needs.
2187 if (strcmp(mod->name, "ndiswrapper") == 0)
2188 add_taint(TAINT_PROPRIETARY_MODULE);
2190 /* driverloader was caught wrongly pretending to be under GPL */
2191 if (strcmp(mod->name, "driverloader") == 0)
2192 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2194 /* Set up MODINFO_ATTR fields */
2195 setup_modinfo(mod, sechdrs, infoindex);
2197 /* Fix up syms, so that st_value is a pointer to location. */
2198 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2203 /* Now we've got everything in the final locations, we can
2204 * find optional sections. */
2205 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2206 sizeof(*mod->kp), &mod->num_kp);
2207 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2208 sizeof(*mod->syms), &mod->num_syms);
2209 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2210 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2211 sizeof(*mod->gpl_syms),
2212 &mod->num_gpl_syms);
2213 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2214 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2215 "__ksymtab_gpl_future",
2216 sizeof(*mod->gpl_future_syms),
2217 &mod->num_gpl_future_syms);
2218 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2219 "__kcrctab_gpl_future");
2221 #ifdef CONFIG_UNUSED_SYMBOLS
2222 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2224 sizeof(*mod->unused_syms),
2225 &mod->num_unused_syms);
2226 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2227 "__kcrctab_unused");
2228 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2229 "__ksymtab_unused_gpl",
2230 sizeof(*mod->unused_gpl_syms),
2231 &mod->num_unused_gpl_syms);
2232 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2233 "__kcrctab_unused_gpl");
2235 #ifdef CONFIG_CONSTRUCTORS
2236 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2237 sizeof(*mod->ctors), &mod->num_ctors);
2240 #ifdef CONFIG_TRACEPOINTS
2241 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2243 sizeof(*mod->tracepoints),
2244 &mod->num_tracepoints);
2246 #ifdef CONFIG_EVENT_TRACING
2247 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2249 sizeof(*mod->trace_events),
2250 &mod->num_trace_events);
2252 * This section contains pointers to allocated objects in the trace
2253 * code and not scanning it leads to false positives.
2255 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2256 mod->num_trace_events, GFP_KERNEL);
2258 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2259 /* sechdrs[0].sh_size is always zero */
2260 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2262 sizeof(*mod->ftrace_callsites),
2263 &mod->num_ftrace_callsites);
2265 #ifdef CONFIG_MODVERSIONS
2266 if ((mod->num_syms && !mod->crcs)
2267 || (mod->num_gpl_syms && !mod->gpl_crcs)
2268 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2269 #ifdef CONFIG_UNUSED_SYMBOLS
2270 || (mod->num_unused_syms && !mod->unused_crcs)
2271 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2274 err = try_to_force_load(mod,
2275 "no versions for exported symbols");
2281 /* Now do relocations. */
2282 for (i = 1; i < hdr->e_shnum; i++) {
2283 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2284 unsigned int info = sechdrs[i].sh_info;
2286 /* Not a valid relocation section? */
2287 if (info >= hdr->e_shnum)
2290 /* Don't bother with non-allocated sections */
2291 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2294 if (sechdrs[i].sh_type == SHT_REL)
2295 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2296 else if (sechdrs[i].sh_type == SHT_RELA)
2297 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2303 /* Find duplicate symbols */
2304 err = verify_export_symbols(mod);
2308 /* Set up and sort exception table */
2309 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2310 sizeof(*mod->extable), &mod->num_exentries);
2311 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2313 /* Finally, copy percpu area over. */
2314 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2315 sechdrs[pcpuindex].sh_size);
2317 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2318 symoffs, stroffs, secstrings, strmap);
2323 struct _ddebug *debug;
2324 unsigned int num_debug;
2326 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2327 sizeof(*debug), &num_debug);
2329 dynamic_debug_setup(debug, num_debug);
2332 err = module_finalize(hdr, sechdrs, mod);
2336 /* flush the icache in correct context */
2341 * Flush the instruction cache, since we've played with text.
2342 * Do it before processing of module parameters, so the module
2343 * can provide parameter accessor functions of its own.
2345 if (mod->module_init)
2346 flush_icache_range((unsigned long)mod->module_init,
2347 (unsigned long)mod->module_init
2349 flush_icache_range((unsigned long)mod->module_core,
2350 (unsigned long)mod->module_core + mod->core_size);
2355 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2356 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2359 /* Now sew it into the lists so we can get lockdep and oops
2360 * info during argument parsing. Noone should access us, since
2361 * strong_try_module_get() will fail.
2362 * lockdep/oops can run asynchronous, so use the RCU list insertion
2363 * function to insert in a way safe to concurrent readers.
2364 * The mutex protects against concurrent writers.
2366 list_add_rcu(&mod->list, &modules);
2368 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2372 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2375 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2376 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2378 /* Get rid of temporary copy */
2381 trace_module_load(mod);
2387 /* Unlink carefully: kallsyms could be walking list. */
2388 list_del_rcu(&mod->list);
2389 synchronize_sched();
2390 module_arch_cleanup(mod);
2393 kobject_del(&mod->mkobj.kobj);
2394 kobject_put(&mod->mkobj.kobj);
2396 module_unload_free(mod);
2397 #if defined(CONFIG_MODULE_UNLOAD)
2398 free_percpu(mod->refptr);
2401 module_free(mod, mod->module_init);
2403 module_free(mod, mod->module_core);
2404 /* mod will be freed with core. Don't access it beyond this line! */
2407 percpu_modfree(percpu);
2413 return ERR_PTR(err);
2416 printk(KERN_ERR "Module len %lu truncated\n", len);
2421 /* Call module constructors. */
2422 static void do_mod_ctors(struct module *mod)
2424 #ifdef CONFIG_CONSTRUCTORS
2427 for (i = 0; i < mod->num_ctors; i++)
2432 /* This is where the real work happens */
2433 SYSCALL_DEFINE3(init_module, void __user *, umod,
2434 unsigned long, len, const char __user *, uargs)
2439 /* Must have permission */
2440 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2443 /* Only one module load at a time, please */
2444 if (mutex_lock_interruptible(&module_mutex) != 0)
2447 /* Do all the hard work */
2448 mod = load_module(umod, len, uargs);
2450 mutex_unlock(&module_mutex);
2451 return PTR_ERR(mod);
2454 /* Drop lock so they can recurse */
2455 mutex_unlock(&module_mutex);
2457 blocking_notifier_call_chain(&module_notify_list,
2458 MODULE_STATE_COMING, mod);
2461 /* Start the module */
2462 if (mod->init != NULL)
2463 ret = do_one_initcall(mod->init);
2465 /* Init routine failed: abort. Try to protect us from
2466 buggy refcounters. */
2467 mod->state = MODULE_STATE_GOING;
2468 synchronize_sched();
2470 blocking_notifier_call_chain(&module_notify_list,
2471 MODULE_STATE_GOING, mod);
2472 mutex_lock(&module_mutex);
2474 mutex_unlock(&module_mutex);
2475 wake_up(&module_wq);
2480 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2481 "%s: loading module anyway...\n",
2482 __func__, mod->name, ret,
2487 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2488 mod->state = MODULE_STATE_LIVE;
2489 wake_up(&module_wq);
2490 blocking_notifier_call_chain(&module_notify_list,
2491 MODULE_STATE_LIVE, mod);
2493 /* We need to finish all async code before the module init sequence is done */
2494 async_synchronize_full();
2496 mutex_lock(&module_mutex);
2497 /* Drop initial reference. */
2499 trim_init_extable(mod);
2500 #ifdef CONFIG_KALLSYMS
2501 mod->num_symtab = mod->core_num_syms;
2502 mod->symtab = mod->core_symtab;
2503 mod->strtab = mod->core_strtab;
2505 module_free(mod, mod->module_init);
2506 mod->module_init = NULL;
2508 mod->init_text_size = 0;
2509 mutex_unlock(&module_mutex);
2514 static inline int within(unsigned long addr, void *start, unsigned long size)
2516 return ((void *)addr >= start && (void *)addr < start + size);
2519 #ifdef CONFIG_KALLSYMS
2521 * This ignores the intensely annoying "mapping symbols" found
2522 * in ARM ELF files: $a, $t and $d.
2524 static inline int is_arm_mapping_symbol(const char *str)
2526 return str[0] == '$' && strchr("atd", str[1])
2527 && (str[2] == '\0' || str[2] == '.');
2530 static const char *get_ksymbol(struct module *mod,
2532 unsigned long *size,
2533 unsigned long *offset)
2535 unsigned int i, best = 0;
2536 unsigned long nextval;
2538 /* At worse, next value is at end of module */
2539 if (within_module_init(addr, mod))
2540 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2542 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2544 /* Scan for closest preceeding symbol, and next symbol. (ELF
2545 starts real symbols at 1). */
2546 for (i = 1; i < mod->num_symtab; i++) {
2547 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2550 /* We ignore unnamed symbols: they're uninformative
2551 * and inserted at a whim. */
2552 if (mod->symtab[i].st_value <= addr
2553 && mod->symtab[i].st_value > mod->symtab[best].st_value
2554 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2555 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2557 if (mod->symtab[i].st_value > addr
2558 && mod->symtab[i].st_value < nextval
2559 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2560 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2561 nextval = mod->symtab[i].st_value;
2568 *size = nextval - mod->symtab[best].st_value;
2570 *offset = addr - mod->symtab[best].st_value;
2571 return mod->strtab + mod->symtab[best].st_name;
2574 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2575 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2576 const char *module_address_lookup(unsigned long addr,
2577 unsigned long *size,
2578 unsigned long *offset,
2583 const char *ret = NULL;
2586 list_for_each_entry_rcu(mod, &modules, list) {
2587 if (within_module_init(addr, mod) ||
2588 within_module_core(addr, mod)) {
2590 *modname = mod->name;
2591 ret = get_ksymbol(mod, addr, size, offset);
2595 /* Make a copy in here where it's safe */
2597 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2604 int lookup_module_symbol_name(unsigned long addr, char *symname)
2609 list_for_each_entry_rcu(mod, &modules, list) {
2610 if (within_module_init(addr, mod) ||
2611 within_module_core(addr, mod)) {
2614 sym = get_ksymbol(mod, addr, NULL, NULL);
2617 strlcpy(symname, sym, KSYM_NAME_LEN);
2627 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2628 unsigned long *offset, char *modname, char *name)
2633 list_for_each_entry_rcu(mod, &modules, list) {
2634 if (within_module_init(addr, mod) ||
2635 within_module_core(addr, mod)) {
2638 sym = get_ksymbol(mod, addr, size, offset);
2642 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2644 strlcpy(name, sym, KSYM_NAME_LEN);
2654 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2655 char *name, char *module_name, int *exported)
2660 list_for_each_entry_rcu(mod, &modules, list) {
2661 if (symnum < mod->num_symtab) {
2662 *value = mod->symtab[symnum].st_value;
2663 *type = mod->symtab[symnum].st_info;
2664 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2666 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2667 *exported = is_exported(name, *value, mod);
2671 symnum -= mod->num_symtab;
2677 static unsigned long mod_find_symname(struct module *mod, const char *name)
2681 for (i = 0; i < mod->num_symtab; i++)
2682 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2683 mod->symtab[i].st_info != 'U')
2684 return mod->symtab[i].st_value;
2688 /* Look for this name: can be of form module:name. */
2689 unsigned long module_kallsyms_lookup_name(const char *name)
2693 unsigned long ret = 0;
2695 /* Don't lock: we're in enough trouble already. */
2697 if ((colon = strchr(name, ':')) != NULL) {
2699 if ((mod = find_module(name)) != NULL)
2700 ret = mod_find_symname(mod, colon+1);
2703 list_for_each_entry_rcu(mod, &modules, list)
2704 if ((ret = mod_find_symname(mod, name)) != 0)
2711 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2712 struct module *, unsigned long),
2719 list_for_each_entry(mod, &modules, list) {
2720 for (i = 0; i < mod->num_symtab; i++) {
2721 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2722 mod, mod->symtab[i].st_value);
2729 #endif /* CONFIG_KALLSYMS */
2731 static char *module_flags(struct module *mod, char *buf)
2736 mod->state == MODULE_STATE_GOING ||
2737 mod->state == MODULE_STATE_COMING) {
2739 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2741 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2743 if (mod->taints & (1 << TAINT_CRAP))
2746 * TAINT_FORCED_RMMOD: could be added.
2747 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2751 /* Show a - for module-is-being-unloaded */
2752 if (mod->state == MODULE_STATE_GOING)
2754 /* Show a + for module-is-being-loaded */
2755 if (mod->state == MODULE_STATE_COMING)
2764 #ifdef CONFIG_PROC_FS
2765 /* Called by the /proc file system to return a list of modules. */
2766 static void *m_start(struct seq_file *m, loff_t *pos)
2768 mutex_lock(&module_mutex);
2769 return seq_list_start(&modules, *pos);
2772 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2774 return seq_list_next(p, &modules, pos);
2777 static void m_stop(struct seq_file *m, void *p)
2779 mutex_unlock(&module_mutex);
2782 static int m_show(struct seq_file *m, void *p)
2784 struct module *mod = list_entry(p, struct module, list);
2787 seq_printf(m, "%s %u",
2788 mod->name, mod->init_size + mod->core_size);
2789 print_unload_info(m, mod);
2791 /* Informative for users. */
2792 seq_printf(m, " %s",
2793 mod->state == MODULE_STATE_GOING ? "Unloading":
2794 mod->state == MODULE_STATE_COMING ? "Loading":
2796 /* Used by oprofile and other similar tools. */
2797 seq_printf(m, " 0x%p", mod->module_core);
2801 seq_printf(m, " %s", module_flags(mod, buf));
2803 seq_printf(m, "\n");
2807 /* Format: modulename size refcount deps address
2809 Where refcount is a number or -, and deps is a comma-separated list
2812 static const struct seq_operations modules_op = {
2819 static int modules_open(struct inode *inode, struct file *file)
2821 return seq_open(file, &modules_op);
2824 static const struct file_operations proc_modules_operations = {
2825 .open = modules_open,
2827 .llseek = seq_lseek,
2828 .release = seq_release,
2831 static int __init proc_modules_init(void)
2833 proc_create("modules", 0, NULL, &proc_modules_operations);
2836 module_init(proc_modules_init);
2839 /* Given an address, look for it in the module exception tables. */
2840 const struct exception_table_entry *search_module_extables(unsigned long addr)
2842 const struct exception_table_entry *e = NULL;
2846 list_for_each_entry_rcu(mod, &modules, list) {
2847 if (mod->num_exentries == 0)
2850 e = search_extable(mod->extable,
2851 mod->extable + mod->num_exentries - 1,
2858 /* Now, if we found one, we are running inside it now, hence
2859 we cannot unload the module, hence no refcnt needed. */
2864 * is_module_address - is this address inside a module?
2865 * @addr: the address to check.
2867 * See is_module_text_address() if you simply want to see if the address
2868 * is code (not data).
2870 bool is_module_address(unsigned long addr)
2875 ret = __module_address(addr) != NULL;
2882 * __module_address - get the module which contains an address.
2883 * @addr: the address.
2885 * Must be called with preempt disabled or module mutex held so that
2886 * module doesn't get freed during this.
2888 struct module *__module_address(unsigned long addr)
2892 if (addr < module_addr_min || addr > module_addr_max)
2895 list_for_each_entry_rcu(mod, &modules, list)
2896 if (within_module_core(addr, mod)
2897 || within_module_init(addr, mod))
2901 EXPORT_SYMBOL_GPL(__module_address);
2904 * is_module_text_address - is this address inside module code?
2905 * @addr: the address to check.
2907 * See is_module_address() if you simply want to see if the address is
2908 * anywhere in a module. See kernel_text_address() for testing if an
2909 * address corresponds to kernel or module code.
2911 bool is_module_text_address(unsigned long addr)
2916 ret = __module_text_address(addr) != NULL;
2923 * __module_text_address - get the module whose code contains an address.
2924 * @addr: the address.
2926 * Must be called with preempt disabled or module mutex held so that
2927 * module doesn't get freed during this.
2929 struct module *__module_text_address(unsigned long addr)
2931 struct module *mod = __module_address(addr);
2933 /* Make sure it's within the text section. */
2934 if (!within(addr, mod->module_init, mod->init_text_size)
2935 && !within(addr, mod->module_core, mod->core_text_size))
2940 EXPORT_SYMBOL_GPL(__module_text_address);
2942 /* Don't grab lock, we're oopsing. */
2943 void print_modules(void)
2948 printk(KERN_DEFAULT "Modules linked in:");
2949 /* Most callers should already have preempt disabled, but make sure */
2951 list_for_each_entry_rcu(mod, &modules, list)
2952 printk(" %s%s", mod->name, module_flags(mod, buf));
2954 if (last_unloaded_module[0])
2955 printk(" [last unloaded: %s]", last_unloaded_module);
2959 #ifdef CONFIG_MODVERSIONS
2960 /* Generate the signature for all relevant module structures here.
2961 * If these change, we don't want to try to parse the module. */
2962 void module_layout(struct module *mod,
2963 struct modversion_info *ver,
2964 struct kernel_param *kp,
2965 struct kernel_symbol *ks,
2966 struct tracepoint *tp)
2969 EXPORT_SYMBOL(module_layout);
2972 #ifdef CONFIG_TRACEPOINTS
2973 void module_update_tracepoints(void)
2977 mutex_lock(&module_mutex);
2978 list_for_each_entry(mod, &modules, list)
2980 tracepoint_update_probe_range(mod->tracepoints,
2981 mod->tracepoints + mod->num_tracepoints);
2982 mutex_unlock(&module_mutex);
2986 * Returns 0 if current not found.
2987 * Returns 1 if current found.
2989 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2991 struct module *iter_mod;
2994 mutex_lock(&module_mutex);
2995 list_for_each_entry(iter_mod, &modules, list) {
2996 if (!iter_mod->taints) {
2998 * Sorted module list
3000 if (iter_mod < iter->module)
3002 else if (iter_mod > iter->module)
3003 iter->tracepoint = NULL;
3004 found = tracepoint_get_iter_range(&iter->tracepoint,
3005 iter_mod->tracepoints,
3006 iter_mod->tracepoints
3007 + iter_mod->num_tracepoints);
3009 iter->module = iter_mod;
3014 mutex_unlock(&module_mutex);