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);
419 * is_module_percpu_address - test whether address is from module static percpu
420 * @addr: address to test
422 * Test whether @addr belongs to module static percpu area.
425 * %true if @addr is from module static percpu area
427 bool is_module_percpu_address(unsigned long addr)
434 list_for_each_entry_rcu(mod, &modules, list) {
435 if (!mod->percpu_size)
437 for_each_possible_cpu(cpu) {
438 void *start = per_cpu_ptr(mod->percpu, cpu);
440 if ((void *)addr >= start &&
441 (void *)addr < start + mod->percpu_size) {
452 #else /* ... !CONFIG_SMP */
454 static inline void __percpu *mod_percpu(struct module *mod)
458 static inline int percpu_modalloc(struct module *mod,
459 unsigned long size, unsigned long align)
463 static inline void percpu_modfree(struct module *mod)
466 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
468 const char *secstrings)
472 static inline void percpu_modcopy(struct module *mod,
473 const void *from, unsigned long size)
475 /* pcpusec should be 0, and size of that section should be 0. */
478 bool is_module_percpu_address(unsigned long addr)
483 #endif /* CONFIG_SMP */
485 #define MODINFO_ATTR(field) \
486 static void setup_modinfo_##field(struct module *mod, const char *s) \
488 mod->field = kstrdup(s, GFP_KERNEL); \
490 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
491 struct module *mod, char *buffer) \
493 return sprintf(buffer, "%s\n", mod->field); \
495 static int modinfo_##field##_exists(struct module *mod) \
497 return mod->field != NULL; \
499 static void free_modinfo_##field(struct module *mod) \
504 static struct module_attribute modinfo_##field = { \
505 .attr = { .name = __stringify(field), .mode = 0444 }, \
506 .show = show_modinfo_##field, \
507 .setup = setup_modinfo_##field, \
508 .test = modinfo_##field##_exists, \
509 .free = free_modinfo_##field, \
512 MODINFO_ATTR(version);
513 MODINFO_ATTR(srcversion);
515 static char last_unloaded_module[MODULE_NAME_LEN+1];
517 #ifdef CONFIG_MODULE_UNLOAD
518 /* Init the unload section of the module. */
519 static void module_unload_init(struct module *mod)
523 INIT_LIST_HEAD(&mod->modules_which_use_me);
524 for_each_possible_cpu(cpu)
525 per_cpu_ptr(mod->refptr, cpu)->count = 0;
527 /* Hold reference count during initialization. */
528 __this_cpu_write(mod->refptr->count, 1);
529 /* Backwards compatibility macros put refcount during init. */
530 mod->waiter = current;
533 /* modules using other modules */
536 struct list_head list;
537 struct module *module_which_uses;
540 /* Does a already use b? */
541 static int already_uses(struct module *a, struct module *b)
543 struct module_use *use;
545 list_for_each_entry(use, &b->modules_which_use_me, list) {
546 if (use->module_which_uses == a) {
547 DEBUGP("%s uses %s!\n", a->name, b->name);
551 DEBUGP("%s does not use %s!\n", a->name, b->name);
555 /* Module a uses b */
556 int use_module(struct module *a, struct module *b)
558 struct module_use *use;
561 if (b == NULL || already_uses(a, b)) return 1;
563 /* If we're interrupted or time out, we fail. */
564 if (wait_event_interruptible_timeout(
565 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
567 printk("%s: gave up waiting for init of module %s.\n",
572 /* If strong_try_module_get() returned a different error, we fail. */
576 DEBUGP("Allocating new usage for %s.\n", a->name);
577 use = kmalloc(sizeof(*use), GFP_ATOMIC);
579 printk("%s: out of memory loading\n", a->name);
584 use->module_which_uses = a;
585 list_add(&use->list, &b->modules_which_use_me);
586 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
589 EXPORT_SYMBOL_GPL(use_module);
591 /* Clear the unload stuff of the module. */
592 static void module_unload_free(struct module *mod)
596 list_for_each_entry(i, &modules, list) {
597 struct module_use *use;
599 list_for_each_entry(use, &i->modules_which_use_me, list) {
600 if (use->module_which_uses == mod) {
601 DEBUGP("%s unusing %s\n", mod->name, i->name);
603 list_del(&use->list);
605 sysfs_remove_link(i->holders_dir, mod->name);
606 /* There can be at most one match. */
613 #ifdef CONFIG_MODULE_FORCE_UNLOAD
614 static inline int try_force_unload(unsigned int flags)
616 int ret = (flags & O_TRUNC);
618 add_taint(TAINT_FORCED_RMMOD);
622 static inline int try_force_unload(unsigned int flags)
626 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
635 /* Whole machine is stopped with interrupts off when this runs. */
636 static int __try_stop_module(void *_sref)
638 struct stopref *sref = _sref;
640 /* If it's not unused, quit unless we're forcing. */
641 if (module_refcount(sref->mod) != 0) {
642 if (!(*sref->forced = try_force_unload(sref->flags)))
646 /* Mark it as dying. */
647 sref->mod->state = MODULE_STATE_GOING;
651 static int try_stop_module(struct module *mod, int flags, int *forced)
653 if (flags & O_NONBLOCK) {
654 struct stopref sref = { mod, flags, forced };
656 return stop_machine(__try_stop_module, &sref, NULL);
658 /* We don't need to stop the machine for this. */
659 mod->state = MODULE_STATE_GOING;
665 unsigned int module_refcount(struct module *mod)
667 unsigned int total = 0;
670 for_each_possible_cpu(cpu)
671 total += per_cpu_ptr(mod->refptr, cpu)->count;
674 EXPORT_SYMBOL(module_refcount);
676 /* This exists whether we can unload or not */
677 static void free_module(struct module *mod);
679 static void wait_for_zero_refcount(struct module *mod)
681 /* Since we might sleep for some time, release the mutex first */
682 mutex_unlock(&module_mutex);
684 DEBUGP("Looking at refcount...\n");
685 set_current_state(TASK_UNINTERRUPTIBLE);
686 if (module_refcount(mod) == 0)
690 current->state = TASK_RUNNING;
691 mutex_lock(&module_mutex);
694 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
698 char name[MODULE_NAME_LEN];
701 if (!capable(CAP_SYS_MODULE) || modules_disabled)
704 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
706 name[MODULE_NAME_LEN-1] = '\0';
708 /* Create stop_machine threads since free_module relies on
709 * a non-failing stop_machine call. */
710 ret = stop_machine_create();
714 if (mutex_lock_interruptible(&module_mutex) != 0) {
719 mod = find_module(name);
725 if (!list_empty(&mod->modules_which_use_me)) {
726 /* Other modules depend on us: get rid of them first. */
731 /* Doing init or already dying? */
732 if (mod->state != MODULE_STATE_LIVE) {
733 /* FIXME: if (force), slam module count and wake up
735 DEBUGP("%s already dying\n", mod->name);
740 /* If it has an init func, it must have an exit func to unload */
741 if (mod->init && !mod->exit) {
742 forced = try_force_unload(flags);
744 /* This module can't be removed */
750 /* Set this up before setting mod->state */
751 mod->waiter = current;
753 /* Stop the machine so refcounts can't move and disable module. */
754 ret = try_stop_module(mod, flags, &forced);
758 /* Never wait if forced. */
759 if (!forced && module_refcount(mod) != 0)
760 wait_for_zero_refcount(mod);
762 mutex_unlock(&module_mutex);
763 /* Final destruction now noone is using it. */
764 if (mod->exit != NULL)
766 blocking_notifier_call_chain(&module_notify_list,
767 MODULE_STATE_GOING, mod);
768 async_synchronize_full();
769 mutex_lock(&module_mutex);
770 /* Store the name of the last unloaded module for diagnostic purposes */
771 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
772 ddebug_remove_module(mod->name);
776 mutex_unlock(&module_mutex);
778 stop_machine_destroy();
782 static inline void print_unload_info(struct seq_file *m, struct module *mod)
784 struct module_use *use;
785 int printed_something = 0;
787 seq_printf(m, " %u ", module_refcount(mod));
789 /* Always include a trailing , so userspace can differentiate
790 between this and the old multi-field proc format. */
791 list_for_each_entry(use, &mod->modules_which_use_me, list) {
792 printed_something = 1;
793 seq_printf(m, "%s,", use->module_which_uses->name);
796 if (mod->init != NULL && mod->exit == NULL) {
797 printed_something = 1;
798 seq_printf(m, "[permanent],");
801 if (!printed_something)
805 void __symbol_put(const char *symbol)
807 struct module *owner;
810 if (!find_symbol(symbol, &owner, NULL, true, false))
815 EXPORT_SYMBOL(__symbol_put);
817 /* Note this assumes addr is a function, which it currently always is. */
818 void symbol_put_addr(void *addr)
820 struct module *modaddr;
821 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
823 if (core_kernel_text(a))
826 /* module_text_address is safe here: we're supposed to have reference
827 * to module from symbol_get, so it can't go away. */
828 modaddr = __module_text_address(a);
832 EXPORT_SYMBOL_GPL(symbol_put_addr);
834 static ssize_t show_refcnt(struct module_attribute *mattr,
835 struct module *mod, char *buffer)
837 return sprintf(buffer, "%u\n", module_refcount(mod));
840 static struct module_attribute refcnt = {
841 .attr = { .name = "refcnt", .mode = 0444 },
845 void module_put(struct module *module)
849 __this_cpu_dec(module->refptr->count);
851 trace_module_put(module, _RET_IP_,
852 __this_cpu_read(module->refptr->count));
853 /* Maybe they're waiting for us to drop reference? */
854 if (unlikely(!module_is_live(module)))
855 wake_up_process(module->waiter);
859 EXPORT_SYMBOL(module_put);
861 #else /* !CONFIG_MODULE_UNLOAD */
862 static inline void print_unload_info(struct seq_file *m, struct module *mod)
864 /* We don't know the usage count, or what modules are using. */
865 seq_printf(m, " - -");
868 static inline void module_unload_free(struct module *mod)
872 int use_module(struct module *a, struct module *b)
874 return strong_try_module_get(b) == 0;
876 EXPORT_SYMBOL_GPL(use_module);
878 static inline void module_unload_init(struct module *mod)
881 #endif /* CONFIG_MODULE_UNLOAD */
883 static ssize_t show_initstate(struct module_attribute *mattr,
884 struct module *mod, char *buffer)
886 const char *state = "unknown";
888 switch (mod->state) {
889 case MODULE_STATE_LIVE:
892 case MODULE_STATE_COMING:
895 case MODULE_STATE_GOING:
899 return sprintf(buffer, "%s\n", state);
902 static struct module_attribute initstate = {
903 .attr = { .name = "initstate", .mode = 0444 },
904 .show = show_initstate,
907 static struct module_attribute *modinfo_attrs[] = {
911 #ifdef CONFIG_MODULE_UNLOAD
917 static const char vermagic[] = VERMAGIC_STRING;
919 static int try_to_force_load(struct module *mod, const char *reason)
921 #ifdef CONFIG_MODULE_FORCE_LOAD
922 if (!test_taint(TAINT_FORCED_MODULE))
923 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
925 add_taint_module(mod, TAINT_FORCED_MODULE);
932 #ifdef CONFIG_MODVERSIONS
933 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
934 static unsigned long maybe_relocated(unsigned long crc,
935 const struct module *crc_owner)
937 #ifdef ARCH_RELOCATES_KCRCTAB
938 if (crc_owner == NULL)
939 return crc - (unsigned long)reloc_start;
944 static int check_version(Elf_Shdr *sechdrs,
945 unsigned int versindex,
948 const unsigned long *crc,
949 const struct module *crc_owner)
951 unsigned int i, num_versions;
952 struct modversion_info *versions;
954 /* Exporting module didn't supply crcs? OK, we're already tainted. */
958 /* No versions at all? modprobe --force does this. */
960 return try_to_force_load(mod, symname) == 0;
962 versions = (void *) sechdrs[versindex].sh_addr;
963 num_versions = sechdrs[versindex].sh_size
964 / sizeof(struct modversion_info);
966 for (i = 0; i < num_versions; i++) {
967 if (strcmp(versions[i].name, symname) != 0)
970 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
972 DEBUGP("Found checksum %lX vs module %lX\n",
973 maybe_relocated(*crc, crc_owner), versions[i].crc);
977 printk(KERN_WARNING "%s: no symbol version for %s\n",
982 printk("%s: disagrees about version of symbol %s\n",
987 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
988 unsigned int versindex,
991 const unsigned long *crc;
993 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
996 return check_version(sechdrs, versindex, "module_layout", mod, crc,
1000 /* First part is kernel version, which we ignore if module has crcs. */
1001 static inline int same_magic(const char *amagic, const char *bmagic,
1005 amagic += strcspn(amagic, " ");
1006 bmagic += strcspn(bmagic, " ");
1008 return strcmp(amagic, bmagic) == 0;
1011 static inline int check_version(Elf_Shdr *sechdrs,
1012 unsigned int versindex,
1013 const char *symname,
1015 const unsigned long *crc,
1016 const struct module *crc_owner)
1021 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1022 unsigned int versindex,
1028 static inline int same_magic(const char *amagic, const char *bmagic,
1031 return strcmp(amagic, bmagic) == 0;
1033 #endif /* CONFIG_MODVERSIONS */
1035 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1036 Must be holding module_mutex. */
1037 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
1038 unsigned int versindex,
1042 struct module *owner;
1043 const struct kernel_symbol *sym;
1044 const unsigned long *crc;
1046 sym = find_symbol(name, &owner, &crc,
1047 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1048 /* use_module can fail due to OOM,
1049 or module initialization or unloading */
1051 if (!check_version(sechdrs, versindex, name, mod, crc, owner)
1052 || !use_module(mod, owner))
1059 * /sys/module/foo/sections stuff
1060 * J. Corbet <corbet@lwn.net>
1062 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1064 static inline bool sect_empty(const Elf_Shdr *sect)
1066 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1069 struct module_sect_attr
1071 struct module_attribute mattr;
1073 unsigned long address;
1076 struct module_sect_attrs
1078 struct attribute_group grp;
1079 unsigned int nsections;
1080 struct module_sect_attr attrs[0];
1083 static ssize_t module_sect_show(struct module_attribute *mattr,
1084 struct module *mod, char *buf)
1086 struct module_sect_attr *sattr =
1087 container_of(mattr, struct module_sect_attr, mattr);
1088 return sprintf(buf, "0x%lx\n", sattr->address);
1091 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1093 unsigned int section;
1095 for (section = 0; section < sect_attrs->nsections; section++)
1096 kfree(sect_attrs->attrs[section].name);
1100 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1101 char *secstrings, Elf_Shdr *sechdrs)
1103 unsigned int nloaded = 0, i, size[2];
1104 struct module_sect_attrs *sect_attrs;
1105 struct module_sect_attr *sattr;
1106 struct attribute **gattr;
1108 /* Count loaded sections and allocate structures */
1109 for (i = 0; i < nsect; i++)
1110 if (!sect_empty(&sechdrs[i]))
1112 size[0] = ALIGN(sizeof(*sect_attrs)
1113 + nloaded * sizeof(sect_attrs->attrs[0]),
1114 sizeof(sect_attrs->grp.attrs[0]));
1115 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1116 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1117 if (sect_attrs == NULL)
1120 /* Setup section attributes. */
1121 sect_attrs->grp.name = "sections";
1122 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1124 sect_attrs->nsections = 0;
1125 sattr = §_attrs->attrs[0];
1126 gattr = §_attrs->grp.attrs[0];
1127 for (i = 0; i < nsect; i++) {
1128 if (sect_empty(&sechdrs[i]))
1130 sattr->address = sechdrs[i].sh_addr;
1131 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1133 if (sattr->name == NULL)
1135 sect_attrs->nsections++;
1136 sysfs_attr_init(&sattr->mattr.attr);
1137 sattr->mattr.show = module_sect_show;
1138 sattr->mattr.store = NULL;
1139 sattr->mattr.attr.name = sattr->name;
1140 sattr->mattr.attr.mode = S_IRUGO;
1141 *(gattr++) = &(sattr++)->mattr.attr;
1145 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1148 mod->sect_attrs = sect_attrs;
1151 free_sect_attrs(sect_attrs);
1154 static void remove_sect_attrs(struct module *mod)
1156 if (mod->sect_attrs) {
1157 sysfs_remove_group(&mod->mkobj.kobj,
1158 &mod->sect_attrs->grp);
1159 /* We are positive that no one is using any sect attrs
1160 * at this point. Deallocate immediately. */
1161 free_sect_attrs(mod->sect_attrs);
1162 mod->sect_attrs = NULL;
1167 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1170 struct module_notes_attrs {
1171 struct kobject *dir;
1173 struct bin_attribute attrs[0];
1176 static ssize_t module_notes_read(struct kobject *kobj,
1177 struct bin_attribute *bin_attr,
1178 char *buf, loff_t pos, size_t count)
1181 * The caller checked the pos and count against our size.
1183 memcpy(buf, bin_attr->private + pos, count);
1187 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1190 if (notes_attrs->dir) {
1192 sysfs_remove_bin_file(notes_attrs->dir,
1193 ¬es_attrs->attrs[i]);
1194 kobject_put(notes_attrs->dir);
1199 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1200 char *secstrings, Elf_Shdr *sechdrs)
1202 unsigned int notes, loaded, i;
1203 struct module_notes_attrs *notes_attrs;
1204 struct bin_attribute *nattr;
1206 /* failed to create section attributes, so can't create notes */
1207 if (!mod->sect_attrs)
1210 /* Count notes sections and allocate structures. */
1212 for (i = 0; i < nsect; i++)
1213 if (!sect_empty(&sechdrs[i]) &&
1214 (sechdrs[i].sh_type == SHT_NOTE))
1220 notes_attrs = kzalloc(sizeof(*notes_attrs)
1221 + notes * sizeof(notes_attrs->attrs[0]),
1223 if (notes_attrs == NULL)
1226 notes_attrs->notes = notes;
1227 nattr = ¬es_attrs->attrs[0];
1228 for (loaded = i = 0; i < nsect; ++i) {
1229 if (sect_empty(&sechdrs[i]))
1231 if (sechdrs[i].sh_type == SHT_NOTE) {
1232 sysfs_bin_attr_init(nattr);
1233 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1234 nattr->attr.mode = S_IRUGO;
1235 nattr->size = sechdrs[i].sh_size;
1236 nattr->private = (void *) sechdrs[i].sh_addr;
1237 nattr->read = module_notes_read;
1243 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1244 if (!notes_attrs->dir)
1247 for (i = 0; i < notes; ++i)
1248 if (sysfs_create_bin_file(notes_attrs->dir,
1249 ¬es_attrs->attrs[i]))
1252 mod->notes_attrs = notes_attrs;
1256 free_notes_attrs(notes_attrs, i);
1259 static void remove_notes_attrs(struct module *mod)
1261 if (mod->notes_attrs)
1262 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1267 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1268 char *sectstrings, Elf_Shdr *sechdrs)
1272 static inline void remove_sect_attrs(struct module *mod)
1276 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1277 char *sectstrings, Elf_Shdr *sechdrs)
1281 static inline void remove_notes_attrs(struct module *mod)
1287 int module_add_modinfo_attrs(struct module *mod)
1289 struct module_attribute *attr;
1290 struct module_attribute *temp_attr;
1294 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1295 (ARRAY_SIZE(modinfo_attrs) + 1)),
1297 if (!mod->modinfo_attrs)
1300 temp_attr = mod->modinfo_attrs;
1301 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1303 (attr->test && attr->test(mod))) {
1304 memcpy(temp_attr, attr, sizeof(*temp_attr));
1305 sysfs_attr_init(&temp_attr->attr);
1306 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1313 void module_remove_modinfo_attrs(struct module *mod)
1315 struct module_attribute *attr;
1318 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1319 /* pick a field to test for end of list */
1320 if (!attr->attr.name)
1322 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1326 kfree(mod->modinfo_attrs);
1329 int mod_sysfs_init(struct module *mod)
1332 struct kobject *kobj;
1334 if (!module_sysfs_initialized) {
1335 printk(KERN_ERR "%s: module sysfs not initialized\n",
1341 kobj = kset_find_obj(module_kset, mod->name);
1343 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1349 mod->mkobj.mod = mod;
1351 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1352 mod->mkobj.kobj.kset = module_kset;
1353 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1356 kobject_put(&mod->mkobj.kobj);
1358 /* delay uevent until full sysfs population */
1363 int mod_sysfs_setup(struct module *mod,
1364 struct kernel_param *kparam,
1365 unsigned int num_params)
1369 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1370 if (!mod->holders_dir) {
1375 err = module_param_sysfs_setup(mod, kparam, num_params);
1377 goto out_unreg_holders;
1379 err = module_add_modinfo_attrs(mod);
1381 goto out_unreg_param;
1383 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1387 module_param_sysfs_remove(mod);
1389 kobject_put(mod->holders_dir);
1391 kobject_put(&mod->mkobj.kobj);
1395 static void mod_sysfs_fini(struct module *mod)
1397 kobject_put(&mod->mkobj.kobj);
1400 #else /* CONFIG_SYSFS */
1402 static void mod_sysfs_fini(struct module *mod)
1406 #endif /* CONFIG_SYSFS */
1408 static void mod_kobject_remove(struct module *mod)
1410 module_remove_modinfo_attrs(mod);
1411 module_param_sysfs_remove(mod);
1412 kobject_put(mod->mkobj.drivers_dir);
1413 kobject_put(mod->holders_dir);
1414 mod_sysfs_fini(mod);
1418 * unlink the module with the whole machine is stopped with interrupts off
1419 * - this defends against kallsyms not taking locks
1421 static int __unlink_module(void *_mod)
1423 struct module *mod = _mod;
1424 list_del(&mod->list);
1428 /* Free a module, remove from lists, etc (must hold module_mutex). */
1429 static void free_module(struct module *mod)
1431 trace_module_free(mod);
1433 /* Delete from various lists */
1434 stop_machine(__unlink_module, mod, NULL);
1435 remove_notes_attrs(mod);
1436 remove_sect_attrs(mod);
1437 mod_kobject_remove(mod);
1439 /* Arch-specific cleanup. */
1440 module_arch_cleanup(mod);
1442 /* Module unload stuff */
1443 module_unload_free(mod);
1445 /* Free any allocated parameters. */
1446 destroy_params(mod->kp, mod->num_kp);
1448 /* This may be NULL, but that's OK */
1449 module_free(mod, mod->module_init);
1451 percpu_modfree(mod);
1452 #if defined(CONFIG_MODULE_UNLOAD)
1454 free_percpu(mod->refptr);
1456 /* Free lock-classes: */
1457 lockdep_free_key_range(mod->module_core, mod->core_size);
1459 /* Finally, free the core (containing the module structure) */
1460 module_free(mod, mod->module_core);
1463 update_protections(current->mm);
1467 void *__symbol_get(const char *symbol)
1469 struct module *owner;
1470 const struct kernel_symbol *sym;
1473 sym = find_symbol(symbol, &owner, NULL, true, true);
1474 if (sym && strong_try_module_get(owner))
1478 return sym ? (void *)sym->value : NULL;
1480 EXPORT_SYMBOL_GPL(__symbol_get);
1483 * Ensure that an exported symbol [global namespace] does not already exist
1484 * in the kernel or in some other module's exported symbol table.
1486 static int verify_export_symbols(struct module *mod)
1489 struct module *owner;
1490 const struct kernel_symbol *s;
1492 const struct kernel_symbol *sym;
1495 { mod->syms, mod->num_syms },
1496 { mod->gpl_syms, mod->num_gpl_syms },
1497 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1498 #ifdef CONFIG_UNUSED_SYMBOLS
1499 { mod->unused_syms, mod->num_unused_syms },
1500 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1504 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1505 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1506 if (find_symbol(s->name, &owner, NULL, true, false)) {
1508 "%s: exports duplicate symbol %s"
1510 mod->name, s->name, module_name(owner));
1518 /* Change all symbols so that st_value encodes the pointer directly. */
1519 static int simplify_symbols(Elf_Shdr *sechdrs,
1520 unsigned int symindex,
1522 unsigned int versindex,
1523 unsigned int pcpuindex,
1526 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1527 unsigned long secbase;
1528 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1530 const struct kernel_symbol *ksym;
1532 for (i = 1; i < n; i++) {
1533 switch (sym[i].st_shndx) {
1535 /* We compiled with -fno-common. These are not
1536 supposed to happen. */
1537 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1538 printk("%s: please compile with -fno-common\n",
1544 /* Don't need to do anything */
1545 DEBUGP("Absolute symbol: 0x%08lx\n",
1546 (long)sym[i].st_value);
1550 ksym = resolve_symbol(sechdrs, versindex,
1551 strtab + sym[i].st_name, mod);
1552 /* Ok if resolved. */
1554 sym[i].st_value = ksym->value;
1559 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1562 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1563 mod->name, strtab + sym[i].st_name);
1568 /* Divert to percpu allocation if a percpu var. */
1569 if (sym[i].st_shndx == pcpuindex)
1570 secbase = (unsigned long)mod_percpu(mod);
1572 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1573 sym[i].st_value += secbase;
1581 /* Additional bytes needed by arch in front of individual sections */
1582 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1583 unsigned int section)
1585 /* default implementation just returns zero */
1589 /* Update size with this section: return offset. */
1590 static long get_offset(struct module *mod, unsigned int *size,
1591 Elf_Shdr *sechdr, unsigned int section)
1595 *size += arch_mod_section_prepend(mod, section);
1596 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1597 *size = ret + sechdr->sh_size;
1601 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1602 might -- code, read-only data, read-write data, small data. Tally
1603 sizes, and place the offsets into sh_entsize fields: high bit means it
1605 static void layout_sections(struct module *mod,
1606 const Elf_Ehdr *hdr,
1608 const char *secstrings)
1610 static unsigned long const masks[][2] = {
1611 /* NOTE: all executable code must be the first section
1612 * in this array; otherwise modify the text_size
1613 * finder in the two loops below */
1614 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1615 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1616 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1617 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1621 for (i = 0; i < hdr->e_shnum; i++)
1622 sechdrs[i].sh_entsize = ~0UL;
1624 DEBUGP("Core section allocation order:\n");
1625 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1626 for (i = 0; i < hdr->e_shnum; ++i) {
1627 Elf_Shdr *s = &sechdrs[i];
1629 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1630 || (s->sh_flags & masks[m][1])
1631 || s->sh_entsize != ~0UL
1632 || strstarts(secstrings + s->sh_name, ".init"))
1634 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1635 DEBUGP("\t%s\n", secstrings + s->sh_name);
1638 mod->core_text_size = mod->core_size;
1641 DEBUGP("Init section allocation order:\n");
1642 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1643 for (i = 0; i < hdr->e_shnum; ++i) {
1644 Elf_Shdr *s = &sechdrs[i];
1646 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1647 || (s->sh_flags & masks[m][1])
1648 || s->sh_entsize != ~0UL
1649 || !strstarts(secstrings + s->sh_name, ".init"))
1651 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1652 | INIT_OFFSET_MASK);
1653 DEBUGP("\t%s\n", secstrings + s->sh_name);
1656 mod->init_text_size = mod->init_size;
1660 static void set_license(struct module *mod, const char *license)
1663 license = "unspecified";
1665 if (!license_is_gpl_compatible(license)) {
1666 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1667 printk(KERN_WARNING "%s: module license '%s' taints "
1668 "kernel.\n", mod->name, license);
1669 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1673 /* Parse tag=value strings from .modinfo section */
1674 static char *next_string(char *string, unsigned long *secsize)
1676 /* Skip non-zero chars */
1679 if ((*secsize)-- <= 1)
1683 /* Skip any zero padding. */
1684 while (!string[0]) {
1686 if ((*secsize)-- <= 1)
1692 static char *get_modinfo(Elf_Shdr *sechdrs,
1697 unsigned int taglen = strlen(tag);
1698 unsigned long size = sechdrs[info].sh_size;
1700 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1701 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1702 return p + taglen + 1;
1707 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1708 unsigned int infoindex)
1710 struct module_attribute *attr;
1713 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1716 get_modinfo(sechdrs,
1722 static void free_modinfo(struct module *mod)
1724 struct module_attribute *attr;
1727 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1733 #ifdef CONFIG_KALLSYMS
1735 /* lookup symbol in given range of kernel_symbols */
1736 static const struct kernel_symbol *lookup_symbol(const char *name,
1737 const struct kernel_symbol *start,
1738 const struct kernel_symbol *stop)
1740 const struct kernel_symbol *ks = start;
1741 for (; ks < stop; ks++)
1742 if (strcmp(ks->name, name) == 0)
1747 static int is_exported(const char *name, unsigned long value,
1748 const struct module *mod)
1750 const struct kernel_symbol *ks;
1752 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1754 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1755 return ks != NULL && ks->value == value;
1759 static char elf_type(const Elf_Sym *sym,
1761 const char *secstrings,
1764 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1765 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1770 if (sym->st_shndx == SHN_UNDEF)
1772 if (sym->st_shndx == SHN_ABS)
1774 if (sym->st_shndx >= SHN_LORESERVE)
1776 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1778 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1779 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1780 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1782 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1787 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1788 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1793 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1798 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1801 const Elf_Shdr *sec;
1803 if (src->st_shndx == SHN_UNDEF
1804 || src->st_shndx >= shnum
1808 sec = sechdrs + src->st_shndx;
1809 if (!(sec->sh_flags & SHF_ALLOC)
1810 #ifndef CONFIG_KALLSYMS_ALL
1811 || !(sec->sh_flags & SHF_EXECINSTR)
1813 || (sec->sh_entsize & INIT_OFFSET_MASK))
1819 static unsigned long layout_symtab(struct module *mod,
1821 unsigned int symindex,
1822 unsigned int strindex,
1823 const Elf_Ehdr *hdr,
1824 const char *secstrings,
1825 unsigned long *pstroffs,
1826 unsigned long *strmap)
1828 unsigned long symoffs;
1829 Elf_Shdr *symsect = sechdrs + symindex;
1830 Elf_Shdr *strsect = sechdrs + strindex;
1833 unsigned int i, nsrc, ndst;
1835 /* Put symbol section at end of init part of module. */
1836 symsect->sh_flags |= SHF_ALLOC;
1837 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1838 symindex) | INIT_OFFSET_MASK;
1839 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1841 src = (void *)hdr + symsect->sh_offset;
1842 nsrc = symsect->sh_size / sizeof(*src);
1843 strtab = (void *)hdr + strsect->sh_offset;
1844 for (ndst = i = 1; i < nsrc; ++i, ++src)
1845 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1846 unsigned int j = src->st_name;
1848 while(!__test_and_set_bit(j, strmap) && strtab[j])
1853 /* Append room for core symbols at end of core part. */
1854 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1855 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1857 /* Put string table section at end of init part of module. */
1858 strsect->sh_flags |= SHF_ALLOC;
1859 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1860 strindex) | INIT_OFFSET_MASK;
1861 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1863 /* Append room for core symbols' strings at end of core part. */
1864 *pstroffs = mod->core_size;
1865 __set_bit(0, strmap);
1866 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1871 static void add_kallsyms(struct module *mod,
1874 unsigned int symindex,
1875 unsigned int strindex,
1876 unsigned long symoffs,
1877 unsigned long stroffs,
1878 const char *secstrings,
1879 unsigned long *strmap)
1881 unsigned int i, ndst;
1886 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1887 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1888 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1890 /* Set types up while we still have access to sections. */
1891 for (i = 0; i < mod->num_symtab; i++)
1892 mod->symtab[i].st_info
1893 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1895 mod->core_symtab = dst = mod->module_core + symoffs;
1898 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1899 if (!is_core_symbol(src, sechdrs, shnum))
1902 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
1905 mod->core_num_syms = ndst;
1907 mod->core_strtab = s = mod->module_core + stroffs;
1908 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1909 if (test_bit(i, strmap))
1910 *++s = mod->strtab[i];
1913 static inline unsigned long layout_symtab(struct module *mod,
1915 unsigned int symindex,
1916 unsigned int strindex,
1917 const Elf_Ehdr *hdr,
1918 const char *secstrings,
1919 unsigned long *pstroffs,
1920 unsigned long *strmap)
1925 static inline void add_kallsyms(struct module *mod,
1928 unsigned int symindex,
1929 unsigned int strindex,
1930 unsigned long symoffs,
1931 unsigned long stroffs,
1932 const char *secstrings,
1933 const unsigned long *strmap)
1936 #endif /* CONFIG_KALLSYMS */
1938 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1940 #ifdef CONFIG_DYNAMIC_DEBUG
1941 if (ddebug_add_module(debug, num, debug->modname))
1942 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1947 static void *module_alloc_update_bounds(unsigned long size)
1949 void *ret = module_alloc(size);
1952 /* Update module bounds. */
1953 if ((unsigned long)ret < module_addr_min)
1954 module_addr_min = (unsigned long)ret;
1955 if ((unsigned long)ret + size > module_addr_max)
1956 module_addr_max = (unsigned long)ret + size;
1961 #ifdef CONFIG_DEBUG_KMEMLEAK
1962 static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1963 Elf_Shdr *sechdrs, char *secstrings)
1967 /* only scan the sections containing data */
1968 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
1970 for (i = 1; i < hdr->e_shnum; i++) {
1971 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1973 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
1974 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
1977 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
1978 sechdrs[i].sh_size, GFP_KERNEL);
1982 static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1983 Elf_Shdr *sechdrs, char *secstrings)
1988 /* Allocate and load the module: note that size of section 0 is always
1989 zero, and we rely on this for optional sections. */
1990 static noinline struct module *load_module(void __user *umod,
1992 const char __user *uargs)
1996 char *secstrings, *args, *modmagic, *strtab = NULL;
1999 unsigned int symindex = 0;
2000 unsigned int strindex = 0;
2001 unsigned int modindex, versindex, infoindex, pcpuindex;
2004 void *ptr = NULL; /* Stops spurious gcc warning */
2005 unsigned long symoffs, stroffs, *strmap;
2007 mm_segment_t old_fs;
2009 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2011 if (len < sizeof(*hdr))
2012 return ERR_PTR(-ENOEXEC);
2014 /* Suck in entire file: we'll want most of it. */
2015 /* vmalloc barfs on "unusual" numbers. Check here */
2016 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
2017 return ERR_PTR(-ENOMEM);
2019 if (copy_from_user(hdr, umod, len) != 0) {
2024 /* Sanity checks against insmoding binaries or wrong arch,
2025 weird elf version */
2026 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
2027 || hdr->e_type != ET_REL
2028 || !elf_check_arch(hdr)
2029 || hdr->e_shentsize != sizeof(*sechdrs)) {
2034 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
2037 /* Convenience variables */
2038 sechdrs = (void *)hdr + hdr->e_shoff;
2039 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
2040 sechdrs[0].sh_addr = 0;
2042 for (i = 1; i < hdr->e_shnum; i++) {
2043 if (sechdrs[i].sh_type != SHT_NOBITS
2044 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
2047 /* Mark all sections sh_addr with their address in the
2049 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
2051 /* Internal symbols and strings. */
2052 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2054 strindex = sechdrs[i].sh_link;
2055 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2057 #ifndef CONFIG_MODULE_UNLOAD
2058 /* Don't load .exit sections */
2059 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
2060 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2064 modindex = find_sec(hdr, sechdrs, secstrings,
2065 ".gnu.linkonce.this_module");
2067 printk(KERN_WARNING "No module found in object\n");
2071 /* This is temporary: point mod into copy of data. */
2072 mod = (void *)sechdrs[modindex].sh_addr;
2074 if (symindex == 0) {
2075 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2081 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2082 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2083 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2085 /* Don't keep modinfo and version sections. */
2086 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2087 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2089 /* Check module struct version now, before we try to use module. */
2090 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2095 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2096 /* This is allowed: modprobe --force will invalidate it. */
2098 err = try_to_force_load(mod, "bad vermagic");
2101 } else if (!same_magic(modmagic, vermagic, versindex)) {
2102 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2103 mod->name, modmagic, vermagic);
2108 staging = get_modinfo(sechdrs, infoindex, "staging");
2110 add_taint_module(mod, TAINT_CRAP);
2111 printk(KERN_WARNING "%s: module is from the staging directory,"
2112 " the quality is unknown, you have been warned.\n",
2116 /* Now copy in args */
2117 args = strndup_user(uargs, ~0UL >> 1);
2119 err = PTR_ERR(args);
2123 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2124 * sizeof(long), GFP_KERNEL);
2130 if (find_module(mod->name)) {
2135 mod->state = MODULE_STATE_COMING;
2137 /* Allow arches to frob section contents and sizes. */
2138 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2143 /* We have a special allocation for this section. */
2144 err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size,
2145 sechdrs[pcpuindex].sh_addralign);
2148 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2151 /* Determine total sizes, and put offsets in sh_entsize. For now
2152 this is done generically; there doesn't appear to be any
2153 special cases for the architectures. */
2154 layout_sections(mod, hdr, sechdrs, secstrings);
2155 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2156 secstrings, &stroffs, strmap);
2158 /* Do the allocs. */
2159 ptr = module_alloc_update_bounds(mod->core_size);
2161 * The pointer to this block is stored in the module structure
2162 * which is inside the block. Just mark it as not being a
2165 kmemleak_not_leak(ptr);
2170 memset(ptr, 0, mod->core_size);
2171 mod->module_core = ptr;
2173 ptr = module_alloc_update_bounds(mod->init_size);
2175 * The pointer to this block is stored in the module structure
2176 * which is inside the block. This block doesn't need to be
2177 * scanned as it contains data and code that will be freed
2178 * after the module is initialized.
2180 kmemleak_ignore(ptr);
2181 if (!ptr && mod->init_size) {
2185 memset(ptr, 0, mod->init_size);
2186 mod->module_init = ptr;
2188 /* Transfer each section which specifies SHF_ALLOC */
2189 DEBUGP("final section addresses:\n");
2190 for (i = 0; i < hdr->e_shnum; i++) {
2193 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2196 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2197 dest = mod->module_init
2198 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2200 dest = mod->module_core + sechdrs[i].sh_entsize;
2202 if (sechdrs[i].sh_type != SHT_NOBITS)
2203 memcpy(dest, (void *)sechdrs[i].sh_addr,
2204 sechdrs[i].sh_size);
2205 /* Update sh_addr to point to copy in image. */
2206 sechdrs[i].sh_addr = (unsigned long)dest;
2207 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2209 /* Module has been moved. */
2210 mod = (void *)sechdrs[modindex].sh_addr;
2211 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2213 #if defined(CONFIG_MODULE_UNLOAD)
2214 mod->refptr = alloc_percpu(struct module_ref);
2220 /* Now we've moved module, initialize linked lists, etc. */
2221 module_unload_init(mod);
2223 /* add kobject, so we can reference it. */
2224 err = mod_sysfs_init(mod);
2228 /* Set up license info based on the info section */
2229 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2232 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2233 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2234 * using GPL-only symbols it needs.
2236 if (strcmp(mod->name, "ndiswrapper") == 0)
2237 add_taint(TAINT_PROPRIETARY_MODULE);
2239 /* driverloader was caught wrongly pretending to be under GPL */
2240 if (strcmp(mod->name, "driverloader") == 0)
2241 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2243 /* Set up MODINFO_ATTR fields */
2244 setup_modinfo(mod, sechdrs, infoindex);
2246 /* Fix up syms, so that st_value is a pointer to location. */
2247 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2252 /* Now we've got everything in the final locations, we can
2253 * find optional sections. */
2254 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2255 sizeof(*mod->kp), &mod->num_kp);
2256 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2257 sizeof(*mod->syms), &mod->num_syms);
2258 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2259 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2260 sizeof(*mod->gpl_syms),
2261 &mod->num_gpl_syms);
2262 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2263 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2264 "__ksymtab_gpl_future",
2265 sizeof(*mod->gpl_future_syms),
2266 &mod->num_gpl_future_syms);
2267 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2268 "__kcrctab_gpl_future");
2270 #ifdef CONFIG_UNUSED_SYMBOLS
2271 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2273 sizeof(*mod->unused_syms),
2274 &mod->num_unused_syms);
2275 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2276 "__kcrctab_unused");
2277 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2278 "__ksymtab_unused_gpl",
2279 sizeof(*mod->unused_gpl_syms),
2280 &mod->num_unused_gpl_syms);
2281 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2282 "__kcrctab_unused_gpl");
2284 #ifdef CONFIG_CONSTRUCTORS
2285 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2286 sizeof(*mod->ctors), &mod->num_ctors);
2289 #ifdef CONFIG_TRACEPOINTS
2290 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2292 sizeof(*mod->tracepoints),
2293 &mod->num_tracepoints);
2295 #ifdef CONFIG_EVENT_TRACING
2296 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2298 sizeof(*mod->trace_events),
2299 &mod->num_trace_events);
2301 * This section contains pointers to allocated objects in the trace
2302 * code and not scanning it leads to false positives.
2304 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2305 mod->num_trace_events, GFP_KERNEL);
2307 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2308 /* sechdrs[0].sh_size is always zero */
2309 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2311 sizeof(*mod->ftrace_callsites),
2312 &mod->num_ftrace_callsites);
2314 #ifdef CONFIG_MODVERSIONS
2315 if ((mod->num_syms && !mod->crcs)
2316 || (mod->num_gpl_syms && !mod->gpl_crcs)
2317 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2318 #ifdef CONFIG_UNUSED_SYMBOLS
2319 || (mod->num_unused_syms && !mod->unused_crcs)
2320 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2323 err = try_to_force_load(mod,
2324 "no versions for exported symbols");
2330 /* Now do relocations. */
2331 for (i = 1; i < hdr->e_shnum; i++) {
2332 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2333 unsigned int info = sechdrs[i].sh_info;
2335 /* Not a valid relocation section? */
2336 if (info >= hdr->e_shnum)
2339 /* Don't bother with non-allocated sections */
2340 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2343 if (sechdrs[i].sh_type == SHT_REL)
2344 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2345 else if (sechdrs[i].sh_type == SHT_RELA)
2346 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2352 /* Find duplicate symbols */
2353 err = verify_export_symbols(mod);
2357 /* Set up and sort exception table */
2358 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2359 sizeof(*mod->extable), &mod->num_exentries);
2360 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2362 /* Finally, copy percpu area over. */
2363 percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr,
2364 sechdrs[pcpuindex].sh_size);
2366 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2367 symoffs, stroffs, secstrings, strmap);
2372 struct _ddebug *debug;
2373 unsigned int num_debug;
2375 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2376 sizeof(*debug), &num_debug);
2378 dynamic_debug_setup(debug, num_debug);
2381 err = module_finalize(hdr, sechdrs, mod);
2385 /* flush the icache in correct context */
2390 * Flush the instruction cache, since we've played with text.
2391 * Do it before processing of module parameters, so the module
2392 * can provide parameter accessor functions of its own.
2394 if (mod->module_init)
2395 flush_icache_range((unsigned long)mod->module_init,
2396 (unsigned long)mod->module_init
2398 flush_icache_range((unsigned long)mod->module_core,
2399 (unsigned long)mod->module_core + mod->core_size);
2404 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2405 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2408 /* Now sew it into the lists so we can get lockdep and oops
2409 * info during argument parsing. Noone should access us, since
2410 * strong_try_module_get() will fail.
2411 * lockdep/oops can run asynchronous, so use the RCU list insertion
2412 * function to insert in a way safe to concurrent readers.
2413 * The mutex protects against concurrent writers.
2415 list_add_rcu(&mod->list, &modules);
2417 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2421 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2424 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2425 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2427 /* Get rid of temporary copy */
2430 trace_module_load(mod);
2436 /* Unlink carefully: kallsyms could be walking list. */
2437 list_del_rcu(&mod->list);
2438 synchronize_sched();
2439 module_arch_cleanup(mod);
2442 kobject_del(&mod->mkobj.kobj);
2443 kobject_put(&mod->mkobj.kobj);
2445 module_unload_free(mod);
2446 #if defined(CONFIG_MODULE_UNLOAD)
2447 free_percpu(mod->refptr);
2450 module_free(mod, mod->module_init);
2452 module_free(mod, mod->module_core);
2453 /* mod will be freed with core. Don't access it beyond this line! */
2455 percpu_modfree(mod);
2461 return ERR_PTR(err);
2464 printk(KERN_ERR "Module len %lu truncated\n", len);
2469 /* Call module constructors. */
2470 static void do_mod_ctors(struct module *mod)
2472 #ifdef CONFIG_CONSTRUCTORS
2475 for (i = 0; i < mod->num_ctors; i++)
2480 /* This is where the real work happens */
2481 SYSCALL_DEFINE3(init_module, void __user *, umod,
2482 unsigned long, len, const char __user *, uargs)
2487 /* Must have permission */
2488 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2491 /* Only one module load at a time, please */
2492 if (mutex_lock_interruptible(&module_mutex) != 0)
2495 /* Do all the hard work */
2496 mod = load_module(umod, len, uargs);
2498 mutex_unlock(&module_mutex);
2499 return PTR_ERR(mod);
2502 /* Drop lock so they can recurse */
2503 mutex_unlock(&module_mutex);
2505 blocking_notifier_call_chain(&module_notify_list,
2506 MODULE_STATE_COMING, mod);
2509 /* Start the module */
2510 if (mod->init != NULL)
2511 ret = do_one_initcall(mod->init);
2513 /* Init routine failed: abort. Try to protect us from
2514 buggy refcounters. */
2515 mod->state = MODULE_STATE_GOING;
2516 synchronize_sched();
2518 blocking_notifier_call_chain(&module_notify_list,
2519 MODULE_STATE_GOING, mod);
2520 mutex_lock(&module_mutex);
2522 mutex_unlock(&module_mutex);
2523 wake_up(&module_wq);
2528 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2529 "%s: loading module anyway...\n",
2530 __func__, mod->name, ret,
2535 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2536 mod->state = MODULE_STATE_LIVE;
2537 wake_up(&module_wq);
2538 blocking_notifier_call_chain(&module_notify_list,
2539 MODULE_STATE_LIVE, mod);
2541 /* We need to finish all async code before the module init sequence is done */
2542 async_synchronize_full();
2544 mutex_lock(&module_mutex);
2545 /* Drop initial reference. */
2547 trim_init_extable(mod);
2548 #ifdef CONFIG_KALLSYMS
2549 mod->num_symtab = mod->core_num_syms;
2550 mod->symtab = mod->core_symtab;
2551 mod->strtab = mod->core_strtab;
2553 module_free(mod, mod->module_init);
2554 mod->module_init = NULL;
2556 mod->init_text_size = 0;
2557 mutex_unlock(&module_mutex);
2562 static inline int within(unsigned long addr, void *start, unsigned long size)
2564 return ((void *)addr >= start && (void *)addr < start + size);
2567 #ifdef CONFIG_KALLSYMS
2569 * This ignores the intensely annoying "mapping symbols" found
2570 * in ARM ELF files: $a, $t and $d.
2572 static inline int is_arm_mapping_symbol(const char *str)
2574 return str[0] == '$' && strchr("atd", str[1])
2575 && (str[2] == '\0' || str[2] == '.');
2578 static const char *get_ksymbol(struct module *mod,
2580 unsigned long *size,
2581 unsigned long *offset)
2583 unsigned int i, best = 0;
2584 unsigned long nextval;
2586 /* At worse, next value is at end of module */
2587 if (within_module_init(addr, mod))
2588 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2590 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2592 /* Scan for closest preceeding symbol, and next symbol. (ELF
2593 starts real symbols at 1). */
2594 for (i = 1; i < mod->num_symtab; i++) {
2595 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2598 /* We ignore unnamed symbols: they're uninformative
2599 * and inserted at a whim. */
2600 if (mod->symtab[i].st_value <= addr
2601 && mod->symtab[i].st_value > mod->symtab[best].st_value
2602 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2603 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2605 if (mod->symtab[i].st_value > addr
2606 && mod->symtab[i].st_value < nextval
2607 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2608 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2609 nextval = mod->symtab[i].st_value;
2616 *size = nextval - mod->symtab[best].st_value;
2618 *offset = addr - mod->symtab[best].st_value;
2619 return mod->strtab + mod->symtab[best].st_name;
2622 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2623 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2624 const char *module_address_lookup(unsigned long addr,
2625 unsigned long *size,
2626 unsigned long *offset,
2631 const char *ret = NULL;
2634 list_for_each_entry_rcu(mod, &modules, list) {
2635 if (within_module_init(addr, mod) ||
2636 within_module_core(addr, mod)) {
2638 *modname = mod->name;
2639 ret = get_ksymbol(mod, addr, size, offset);
2643 /* Make a copy in here where it's safe */
2645 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2652 int lookup_module_symbol_name(unsigned long addr, char *symname)
2657 list_for_each_entry_rcu(mod, &modules, list) {
2658 if (within_module_init(addr, mod) ||
2659 within_module_core(addr, mod)) {
2662 sym = get_ksymbol(mod, addr, NULL, NULL);
2665 strlcpy(symname, sym, KSYM_NAME_LEN);
2675 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2676 unsigned long *offset, char *modname, char *name)
2681 list_for_each_entry_rcu(mod, &modules, list) {
2682 if (within_module_init(addr, mod) ||
2683 within_module_core(addr, mod)) {
2686 sym = get_ksymbol(mod, addr, size, offset);
2690 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2692 strlcpy(name, sym, KSYM_NAME_LEN);
2702 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2703 char *name, char *module_name, int *exported)
2708 list_for_each_entry_rcu(mod, &modules, list) {
2709 if (symnum < mod->num_symtab) {
2710 *value = mod->symtab[symnum].st_value;
2711 *type = mod->symtab[symnum].st_info;
2712 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2714 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2715 *exported = is_exported(name, *value, mod);
2719 symnum -= mod->num_symtab;
2725 static unsigned long mod_find_symname(struct module *mod, const char *name)
2729 for (i = 0; i < mod->num_symtab; i++)
2730 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2731 mod->symtab[i].st_info != 'U')
2732 return mod->symtab[i].st_value;
2736 /* Look for this name: can be of form module:name. */
2737 unsigned long module_kallsyms_lookup_name(const char *name)
2741 unsigned long ret = 0;
2743 /* Don't lock: we're in enough trouble already. */
2745 if ((colon = strchr(name, ':')) != NULL) {
2747 if ((mod = find_module(name)) != NULL)
2748 ret = mod_find_symname(mod, colon+1);
2751 list_for_each_entry_rcu(mod, &modules, list)
2752 if ((ret = mod_find_symname(mod, name)) != 0)
2759 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2760 struct module *, unsigned long),
2767 list_for_each_entry(mod, &modules, list) {
2768 for (i = 0; i < mod->num_symtab; i++) {
2769 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2770 mod, mod->symtab[i].st_value);
2777 #endif /* CONFIG_KALLSYMS */
2779 static char *module_flags(struct module *mod, char *buf)
2784 mod->state == MODULE_STATE_GOING ||
2785 mod->state == MODULE_STATE_COMING) {
2787 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2789 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2791 if (mod->taints & (1 << TAINT_CRAP))
2794 * TAINT_FORCED_RMMOD: could be added.
2795 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2799 /* Show a - for module-is-being-unloaded */
2800 if (mod->state == MODULE_STATE_GOING)
2802 /* Show a + for module-is-being-loaded */
2803 if (mod->state == MODULE_STATE_COMING)
2812 #ifdef CONFIG_PROC_FS
2813 /* Called by the /proc file system to return a list of modules. */
2814 static void *m_start(struct seq_file *m, loff_t *pos)
2816 mutex_lock(&module_mutex);
2817 return seq_list_start(&modules, *pos);
2820 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2822 return seq_list_next(p, &modules, pos);
2825 static void m_stop(struct seq_file *m, void *p)
2827 mutex_unlock(&module_mutex);
2830 static int m_show(struct seq_file *m, void *p)
2832 struct module *mod = list_entry(p, struct module, list);
2835 seq_printf(m, "%s %u",
2836 mod->name, mod->init_size + mod->core_size);
2837 print_unload_info(m, mod);
2839 /* Informative for users. */
2840 seq_printf(m, " %s",
2841 mod->state == MODULE_STATE_GOING ? "Unloading":
2842 mod->state == MODULE_STATE_COMING ? "Loading":
2844 /* Used by oprofile and other similar tools. */
2845 seq_printf(m, " 0x%p", mod->module_core);
2849 seq_printf(m, " %s", module_flags(mod, buf));
2851 seq_printf(m, "\n");
2855 /* Format: modulename size refcount deps address
2857 Where refcount is a number or -, and deps is a comma-separated list
2860 static const struct seq_operations modules_op = {
2867 static int modules_open(struct inode *inode, struct file *file)
2869 return seq_open(file, &modules_op);
2872 static const struct file_operations proc_modules_operations = {
2873 .open = modules_open,
2875 .llseek = seq_lseek,
2876 .release = seq_release,
2879 static int __init proc_modules_init(void)
2881 proc_create("modules", 0, NULL, &proc_modules_operations);
2884 module_init(proc_modules_init);
2887 /* Given an address, look for it in the module exception tables. */
2888 const struct exception_table_entry *search_module_extables(unsigned long addr)
2890 const struct exception_table_entry *e = NULL;
2894 list_for_each_entry_rcu(mod, &modules, list) {
2895 if (mod->num_exentries == 0)
2898 e = search_extable(mod->extable,
2899 mod->extable + mod->num_exentries - 1,
2906 /* Now, if we found one, we are running inside it now, hence
2907 we cannot unload the module, hence no refcnt needed. */
2912 * is_module_address - is this address inside a module?
2913 * @addr: the address to check.
2915 * See is_module_text_address() if you simply want to see if the address
2916 * is code (not data).
2918 bool is_module_address(unsigned long addr)
2923 ret = __module_address(addr) != NULL;
2930 * __module_address - get the module which contains an address.
2931 * @addr: the address.
2933 * Must be called with preempt disabled or module mutex held so that
2934 * module doesn't get freed during this.
2936 struct module *__module_address(unsigned long addr)
2940 if (addr < module_addr_min || addr > module_addr_max)
2943 list_for_each_entry_rcu(mod, &modules, list)
2944 if (within_module_core(addr, mod)
2945 || within_module_init(addr, mod))
2949 EXPORT_SYMBOL_GPL(__module_address);
2952 * is_module_text_address - is this address inside module code?
2953 * @addr: the address to check.
2955 * See is_module_address() if you simply want to see if the address is
2956 * anywhere in a module. See kernel_text_address() for testing if an
2957 * address corresponds to kernel or module code.
2959 bool is_module_text_address(unsigned long addr)
2964 ret = __module_text_address(addr) != NULL;
2971 * __module_text_address - get the module whose code contains an address.
2972 * @addr: the address.
2974 * Must be called with preempt disabled or module mutex held so that
2975 * module doesn't get freed during this.
2977 struct module *__module_text_address(unsigned long addr)
2979 struct module *mod = __module_address(addr);
2981 /* Make sure it's within the text section. */
2982 if (!within(addr, mod->module_init, mod->init_text_size)
2983 && !within(addr, mod->module_core, mod->core_text_size))
2988 EXPORT_SYMBOL_GPL(__module_text_address);
2990 /* Don't grab lock, we're oopsing. */
2991 void print_modules(void)
2996 printk(KERN_DEFAULT "Modules linked in:");
2997 /* Most callers should already have preempt disabled, but make sure */
2999 list_for_each_entry_rcu(mod, &modules, list)
3000 printk(" %s%s", mod->name, module_flags(mod, buf));
3002 if (last_unloaded_module[0])
3003 printk(" [last unloaded: %s]", last_unloaded_module);
3007 #ifdef CONFIG_MODVERSIONS
3008 /* Generate the signature for all relevant module structures here.
3009 * If these change, we don't want to try to parse the module. */
3010 void module_layout(struct module *mod,
3011 struct modversion_info *ver,
3012 struct kernel_param *kp,
3013 struct kernel_symbol *ks,
3014 struct tracepoint *tp)
3017 EXPORT_SYMBOL(module_layout);
3020 #ifdef CONFIG_TRACEPOINTS
3021 void module_update_tracepoints(void)
3025 mutex_lock(&module_mutex);
3026 list_for_each_entry(mod, &modules, list)
3028 tracepoint_update_probe_range(mod->tracepoints,
3029 mod->tracepoints + mod->num_tracepoints);
3030 mutex_unlock(&module_mutex);
3034 * Returns 0 if current not found.
3035 * Returns 1 if current found.
3037 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
3039 struct module *iter_mod;
3042 mutex_lock(&module_mutex);
3043 list_for_each_entry(iter_mod, &modules, list) {
3044 if (!iter_mod->taints) {
3046 * Sorted module list
3048 if (iter_mod < iter->module)
3050 else if (iter_mod > iter->module)
3051 iter->tracepoint = NULL;
3052 found = tracepoint_get_iter_range(&iter->tracepoint,
3053 iter_mod->tracepoints,
3054 iter_mod->tracepoints
3055 + iter_mod->num_tracepoints);
3057 iter->module = iter_mod;
3062 mutex_unlock(&module_mutex);