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)->incs = 0;
526 per_cpu_ptr(mod->refptr, cpu)->decs = 0;
529 /* Hold reference count during initialization. */
530 __this_cpu_write(mod->refptr->incs, 1);
531 /* Backwards compatibility macros put refcount during init. */
532 mod->waiter = current;
535 /* modules using other modules */
538 struct list_head list;
539 struct module *module_which_uses;
542 /* Does a already use b? */
543 static int already_uses(struct module *a, struct module *b)
545 struct module_use *use;
547 list_for_each_entry(use, &b->modules_which_use_me, list) {
548 if (use->module_which_uses == a) {
549 DEBUGP("%s uses %s!\n", a->name, b->name);
553 DEBUGP("%s does not use %s!\n", a->name, b->name);
557 /* Module a uses b */
558 int use_module(struct module *a, struct module *b)
560 struct module_use *use;
563 if (b == NULL || already_uses(a, b)) return 1;
565 /* If we're interrupted or time out, we fail. */
566 if (wait_event_interruptible_timeout(
567 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
569 printk("%s: gave up waiting for init of module %s.\n",
574 /* If strong_try_module_get() returned a different error, we fail. */
578 DEBUGP("Allocating new usage for %s.\n", a->name);
579 use = kmalloc(sizeof(*use), GFP_ATOMIC);
581 printk("%s: out of memory loading\n", a->name);
586 use->module_which_uses = a;
587 list_add(&use->list, &b->modules_which_use_me);
588 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
591 EXPORT_SYMBOL_GPL(use_module);
593 /* Clear the unload stuff of the module. */
594 static void module_unload_free(struct module *mod)
598 list_for_each_entry(i, &modules, list) {
599 struct module_use *use;
601 list_for_each_entry(use, &i->modules_which_use_me, list) {
602 if (use->module_which_uses == mod) {
603 DEBUGP("%s unusing %s\n", mod->name, i->name);
605 list_del(&use->list);
607 sysfs_remove_link(i->holders_dir, mod->name);
608 /* There can be at most one match. */
615 #ifdef CONFIG_MODULE_FORCE_UNLOAD
616 static inline int try_force_unload(unsigned int flags)
618 int ret = (flags & O_TRUNC);
620 add_taint(TAINT_FORCED_RMMOD);
624 static inline int try_force_unload(unsigned int flags)
628 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
637 /* Whole machine is stopped with interrupts off when this runs. */
638 static int __try_stop_module(void *_sref)
640 struct stopref *sref = _sref;
642 /* If it's not unused, quit unless we're forcing. */
643 if (module_refcount(sref->mod) != 0) {
644 if (!(*sref->forced = try_force_unload(sref->flags)))
648 /* Mark it as dying. */
649 sref->mod->state = MODULE_STATE_GOING;
653 static int try_stop_module(struct module *mod, int flags, int *forced)
655 if (flags & O_NONBLOCK) {
656 struct stopref sref = { mod, flags, forced };
658 return stop_machine(__try_stop_module, &sref, NULL);
660 /* We don't need to stop the machine for this. */
661 mod->state = MODULE_STATE_GOING;
667 unsigned int module_refcount(struct module *mod)
669 unsigned int incs = 0, decs = 0;
672 for_each_possible_cpu(cpu)
673 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
675 * ensure the incs are added up after the decs.
676 * module_put ensures incs are visible before decs with smp_wmb.
678 * This 2-count scheme avoids the situation where the refcount
679 * for CPU0 is read, then CPU0 increments the module refcount,
680 * then CPU1 drops that refcount, then the refcount for CPU1 is
681 * read. We would record a decrement but not its corresponding
682 * increment so we would see a low count (disaster).
684 * Rare situation? But module_refcount can be preempted, and we
685 * might be tallying up 4096+ CPUs. So it is not impossible.
688 for_each_possible_cpu(cpu)
689 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
692 EXPORT_SYMBOL(module_refcount);
694 /* This exists whether we can unload or not */
695 static void free_module(struct module *mod);
697 static void wait_for_zero_refcount(struct module *mod)
699 /* Since we might sleep for some time, release the mutex first */
700 mutex_unlock(&module_mutex);
702 DEBUGP("Looking at refcount...\n");
703 set_current_state(TASK_UNINTERRUPTIBLE);
704 if (module_refcount(mod) == 0)
708 current->state = TASK_RUNNING;
709 mutex_lock(&module_mutex);
712 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
716 char name[MODULE_NAME_LEN];
719 if (!capable(CAP_SYS_MODULE) || modules_disabled)
722 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
724 name[MODULE_NAME_LEN-1] = '\0';
726 /* Create stop_machine threads since free_module relies on
727 * a non-failing stop_machine call. */
728 ret = stop_machine_create();
732 if (mutex_lock_interruptible(&module_mutex) != 0) {
737 mod = find_module(name);
743 if (!list_empty(&mod->modules_which_use_me)) {
744 /* Other modules depend on us: get rid of them first. */
749 /* Doing init or already dying? */
750 if (mod->state != MODULE_STATE_LIVE) {
751 /* FIXME: if (force), slam module count and wake up
753 DEBUGP("%s already dying\n", mod->name);
758 /* If it has an init func, it must have an exit func to unload */
759 if (mod->init && !mod->exit) {
760 forced = try_force_unload(flags);
762 /* This module can't be removed */
768 /* Set this up before setting mod->state */
769 mod->waiter = current;
771 /* Stop the machine so refcounts can't move and disable module. */
772 ret = try_stop_module(mod, flags, &forced);
776 /* Never wait if forced. */
777 if (!forced && module_refcount(mod) != 0)
778 wait_for_zero_refcount(mod);
780 mutex_unlock(&module_mutex);
781 /* Final destruction now noone is using it. */
782 if (mod->exit != NULL)
784 blocking_notifier_call_chain(&module_notify_list,
785 MODULE_STATE_GOING, mod);
786 async_synchronize_full();
787 mutex_lock(&module_mutex);
788 /* Store the name of the last unloaded module for diagnostic purposes */
789 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
790 ddebug_remove_module(mod->name);
794 mutex_unlock(&module_mutex);
796 stop_machine_destroy();
800 static inline void print_unload_info(struct seq_file *m, struct module *mod)
802 struct module_use *use;
803 int printed_something = 0;
805 seq_printf(m, " %u ", module_refcount(mod));
807 /* Always include a trailing , so userspace can differentiate
808 between this and the old multi-field proc format. */
809 list_for_each_entry(use, &mod->modules_which_use_me, list) {
810 printed_something = 1;
811 seq_printf(m, "%s,", use->module_which_uses->name);
814 if (mod->init != NULL && mod->exit == NULL) {
815 printed_something = 1;
816 seq_printf(m, "[permanent],");
819 if (!printed_something)
823 void __symbol_put(const char *symbol)
825 struct module *owner;
828 if (!find_symbol(symbol, &owner, NULL, true, false))
833 EXPORT_SYMBOL(__symbol_put);
835 /* Note this assumes addr is a function, which it currently always is. */
836 void symbol_put_addr(void *addr)
838 struct module *modaddr;
839 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
841 if (core_kernel_text(a))
844 /* module_text_address is safe here: we're supposed to have reference
845 * to module from symbol_get, so it can't go away. */
846 modaddr = __module_text_address(a);
850 EXPORT_SYMBOL_GPL(symbol_put_addr);
852 static ssize_t show_refcnt(struct module_attribute *mattr,
853 struct module *mod, char *buffer)
855 return sprintf(buffer, "%u\n", module_refcount(mod));
858 static struct module_attribute refcnt = {
859 .attr = { .name = "refcnt", .mode = 0444 },
863 void module_put(struct module *module)
867 smp_wmb(); /* see comment in module_refcount */
868 __this_cpu_inc(module->refptr->decs);
870 trace_module_put(module, _RET_IP_,
871 __this_cpu_read(module->refptr->decs));
872 /* Maybe they're waiting for us to drop reference? */
873 if (unlikely(!module_is_live(module)))
874 wake_up_process(module->waiter);
878 EXPORT_SYMBOL(module_put);
880 #else /* !CONFIG_MODULE_UNLOAD */
881 static inline void print_unload_info(struct seq_file *m, struct module *mod)
883 /* We don't know the usage count, or what modules are using. */
884 seq_printf(m, " - -");
887 static inline void module_unload_free(struct module *mod)
891 int use_module(struct module *a, struct module *b)
893 return strong_try_module_get(b) == 0;
895 EXPORT_SYMBOL_GPL(use_module);
897 static inline void module_unload_init(struct module *mod)
900 #endif /* CONFIG_MODULE_UNLOAD */
902 static ssize_t show_initstate(struct module_attribute *mattr,
903 struct module *mod, char *buffer)
905 const char *state = "unknown";
907 switch (mod->state) {
908 case MODULE_STATE_LIVE:
911 case MODULE_STATE_COMING:
914 case MODULE_STATE_GOING:
918 return sprintf(buffer, "%s\n", state);
921 static struct module_attribute initstate = {
922 .attr = { .name = "initstate", .mode = 0444 },
923 .show = show_initstate,
926 static struct module_attribute *modinfo_attrs[] = {
930 #ifdef CONFIG_MODULE_UNLOAD
936 static const char vermagic[] = VERMAGIC_STRING;
938 static int try_to_force_load(struct module *mod, const char *reason)
940 #ifdef CONFIG_MODULE_FORCE_LOAD
941 if (!test_taint(TAINT_FORCED_MODULE))
942 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
944 add_taint_module(mod, TAINT_FORCED_MODULE);
951 #ifdef CONFIG_MODVERSIONS
952 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
953 static unsigned long maybe_relocated(unsigned long crc,
954 const struct module *crc_owner)
956 #ifdef ARCH_RELOCATES_KCRCTAB
957 if (crc_owner == NULL)
958 return crc - (unsigned long)reloc_start;
963 static int check_version(Elf_Shdr *sechdrs,
964 unsigned int versindex,
967 const unsigned long *crc,
968 const struct module *crc_owner)
970 unsigned int i, num_versions;
971 struct modversion_info *versions;
973 /* Exporting module didn't supply crcs? OK, we're already tainted. */
977 /* No versions at all? modprobe --force does this. */
979 return try_to_force_load(mod, symname) == 0;
981 versions = (void *) sechdrs[versindex].sh_addr;
982 num_versions = sechdrs[versindex].sh_size
983 / sizeof(struct modversion_info);
985 for (i = 0; i < num_versions; i++) {
986 if (strcmp(versions[i].name, symname) != 0)
989 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
991 DEBUGP("Found checksum %lX vs module %lX\n",
992 maybe_relocated(*crc, crc_owner), versions[i].crc);
996 printk(KERN_WARNING "%s: no symbol version for %s\n",
1001 printk("%s: disagrees about version of symbol %s\n",
1002 mod->name, symname);
1006 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1007 unsigned int versindex,
1010 const unsigned long *crc;
1012 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
1015 return check_version(sechdrs, versindex, "module_layout", mod, crc,
1019 /* First part is kernel version, which we ignore if module has crcs. */
1020 static inline int same_magic(const char *amagic, const char *bmagic,
1024 amagic += strcspn(amagic, " ");
1025 bmagic += strcspn(bmagic, " ");
1027 return strcmp(amagic, bmagic) == 0;
1030 static inline int check_version(Elf_Shdr *sechdrs,
1031 unsigned int versindex,
1032 const char *symname,
1034 const unsigned long *crc,
1035 const struct module *crc_owner)
1040 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1041 unsigned int versindex,
1047 static inline int same_magic(const char *amagic, const char *bmagic,
1050 return strcmp(amagic, bmagic) == 0;
1052 #endif /* CONFIG_MODVERSIONS */
1054 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1055 Must be holding module_mutex. */
1056 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
1057 unsigned int versindex,
1061 struct module *owner;
1062 const struct kernel_symbol *sym;
1063 const unsigned long *crc;
1065 sym = find_symbol(name, &owner, &crc,
1066 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1067 /* use_module can fail due to OOM,
1068 or module initialization or unloading */
1070 if (!check_version(sechdrs, versindex, name, mod, crc, owner)
1071 || !use_module(mod, owner))
1078 * /sys/module/foo/sections stuff
1079 * J. Corbet <corbet@lwn.net>
1081 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1083 static inline bool sect_empty(const Elf_Shdr *sect)
1085 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1088 struct module_sect_attr
1090 struct module_attribute mattr;
1092 unsigned long address;
1095 struct module_sect_attrs
1097 struct attribute_group grp;
1098 unsigned int nsections;
1099 struct module_sect_attr attrs[0];
1102 static ssize_t module_sect_show(struct module_attribute *mattr,
1103 struct module *mod, char *buf)
1105 struct module_sect_attr *sattr =
1106 container_of(mattr, struct module_sect_attr, mattr);
1107 return sprintf(buf, "0x%lx\n", sattr->address);
1110 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1112 unsigned int section;
1114 for (section = 0; section < sect_attrs->nsections; section++)
1115 kfree(sect_attrs->attrs[section].name);
1119 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1120 char *secstrings, Elf_Shdr *sechdrs)
1122 unsigned int nloaded = 0, i, size[2];
1123 struct module_sect_attrs *sect_attrs;
1124 struct module_sect_attr *sattr;
1125 struct attribute **gattr;
1127 /* Count loaded sections and allocate structures */
1128 for (i = 0; i < nsect; i++)
1129 if (!sect_empty(&sechdrs[i]))
1131 size[0] = ALIGN(sizeof(*sect_attrs)
1132 + nloaded * sizeof(sect_attrs->attrs[0]),
1133 sizeof(sect_attrs->grp.attrs[0]));
1134 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1135 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1136 if (sect_attrs == NULL)
1139 /* Setup section attributes. */
1140 sect_attrs->grp.name = "sections";
1141 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1143 sect_attrs->nsections = 0;
1144 sattr = §_attrs->attrs[0];
1145 gattr = §_attrs->grp.attrs[0];
1146 for (i = 0; i < nsect; i++) {
1147 if (sect_empty(&sechdrs[i]))
1149 sattr->address = sechdrs[i].sh_addr;
1150 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1152 if (sattr->name == NULL)
1154 sect_attrs->nsections++;
1155 sysfs_attr_init(&sattr->mattr.attr);
1156 sattr->mattr.show = module_sect_show;
1157 sattr->mattr.store = NULL;
1158 sattr->mattr.attr.name = sattr->name;
1159 sattr->mattr.attr.mode = S_IRUGO;
1160 *(gattr++) = &(sattr++)->mattr.attr;
1164 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1167 mod->sect_attrs = sect_attrs;
1170 free_sect_attrs(sect_attrs);
1173 static void remove_sect_attrs(struct module *mod)
1175 if (mod->sect_attrs) {
1176 sysfs_remove_group(&mod->mkobj.kobj,
1177 &mod->sect_attrs->grp);
1178 /* We are positive that no one is using any sect attrs
1179 * at this point. Deallocate immediately. */
1180 free_sect_attrs(mod->sect_attrs);
1181 mod->sect_attrs = NULL;
1186 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1189 struct module_notes_attrs {
1190 struct kobject *dir;
1192 struct bin_attribute attrs[0];
1195 static ssize_t module_notes_read(struct kobject *kobj,
1196 struct bin_attribute *bin_attr,
1197 char *buf, loff_t pos, size_t count)
1200 * The caller checked the pos and count against our size.
1202 memcpy(buf, bin_attr->private + pos, count);
1206 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1209 if (notes_attrs->dir) {
1211 sysfs_remove_bin_file(notes_attrs->dir,
1212 ¬es_attrs->attrs[i]);
1213 kobject_put(notes_attrs->dir);
1218 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1219 char *secstrings, Elf_Shdr *sechdrs)
1221 unsigned int notes, loaded, i;
1222 struct module_notes_attrs *notes_attrs;
1223 struct bin_attribute *nattr;
1225 /* failed to create section attributes, so can't create notes */
1226 if (!mod->sect_attrs)
1229 /* Count notes sections and allocate structures. */
1231 for (i = 0; i < nsect; i++)
1232 if (!sect_empty(&sechdrs[i]) &&
1233 (sechdrs[i].sh_type == SHT_NOTE))
1239 notes_attrs = kzalloc(sizeof(*notes_attrs)
1240 + notes * sizeof(notes_attrs->attrs[0]),
1242 if (notes_attrs == NULL)
1245 notes_attrs->notes = notes;
1246 nattr = ¬es_attrs->attrs[0];
1247 for (loaded = i = 0; i < nsect; ++i) {
1248 if (sect_empty(&sechdrs[i]))
1250 if (sechdrs[i].sh_type == SHT_NOTE) {
1251 sysfs_bin_attr_init(nattr);
1252 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1253 nattr->attr.mode = S_IRUGO;
1254 nattr->size = sechdrs[i].sh_size;
1255 nattr->private = (void *) sechdrs[i].sh_addr;
1256 nattr->read = module_notes_read;
1262 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1263 if (!notes_attrs->dir)
1266 for (i = 0; i < notes; ++i)
1267 if (sysfs_create_bin_file(notes_attrs->dir,
1268 ¬es_attrs->attrs[i]))
1271 mod->notes_attrs = notes_attrs;
1275 free_notes_attrs(notes_attrs, i);
1278 static void remove_notes_attrs(struct module *mod)
1280 if (mod->notes_attrs)
1281 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1286 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1287 char *sectstrings, Elf_Shdr *sechdrs)
1291 static inline void remove_sect_attrs(struct module *mod)
1295 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1296 char *sectstrings, Elf_Shdr *sechdrs)
1300 static inline void remove_notes_attrs(struct module *mod)
1306 int module_add_modinfo_attrs(struct module *mod)
1308 struct module_attribute *attr;
1309 struct module_attribute *temp_attr;
1313 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1314 (ARRAY_SIZE(modinfo_attrs) + 1)),
1316 if (!mod->modinfo_attrs)
1319 temp_attr = mod->modinfo_attrs;
1320 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1322 (attr->test && attr->test(mod))) {
1323 memcpy(temp_attr, attr, sizeof(*temp_attr));
1324 sysfs_attr_init(&temp_attr->attr);
1325 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1332 void module_remove_modinfo_attrs(struct module *mod)
1334 struct module_attribute *attr;
1337 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1338 /* pick a field to test for end of list */
1339 if (!attr->attr.name)
1341 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1345 kfree(mod->modinfo_attrs);
1348 int mod_sysfs_init(struct module *mod)
1351 struct kobject *kobj;
1353 if (!module_sysfs_initialized) {
1354 printk(KERN_ERR "%s: module sysfs not initialized\n",
1360 kobj = kset_find_obj(module_kset, mod->name);
1362 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1368 mod->mkobj.mod = mod;
1370 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1371 mod->mkobj.kobj.kset = module_kset;
1372 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1375 kobject_put(&mod->mkobj.kobj);
1377 /* delay uevent until full sysfs population */
1382 int mod_sysfs_setup(struct module *mod,
1383 struct kernel_param *kparam,
1384 unsigned int num_params)
1388 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1389 if (!mod->holders_dir) {
1394 err = module_param_sysfs_setup(mod, kparam, num_params);
1396 goto out_unreg_holders;
1398 err = module_add_modinfo_attrs(mod);
1400 goto out_unreg_param;
1402 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1406 module_param_sysfs_remove(mod);
1408 kobject_put(mod->holders_dir);
1410 kobject_put(&mod->mkobj.kobj);
1414 static void mod_sysfs_fini(struct module *mod)
1416 kobject_put(&mod->mkobj.kobj);
1419 #else /* CONFIG_SYSFS */
1421 static void mod_sysfs_fini(struct module *mod)
1425 #endif /* CONFIG_SYSFS */
1427 static void mod_kobject_remove(struct module *mod)
1429 module_remove_modinfo_attrs(mod);
1430 module_param_sysfs_remove(mod);
1431 kobject_put(mod->mkobj.drivers_dir);
1432 kobject_put(mod->holders_dir);
1433 mod_sysfs_fini(mod);
1437 * unlink the module with the whole machine is stopped with interrupts off
1438 * - this defends against kallsyms not taking locks
1440 static int __unlink_module(void *_mod)
1442 struct module *mod = _mod;
1443 list_del(&mod->list);
1447 /* Free a module, remove from lists, etc (must hold module_mutex). */
1448 static void free_module(struct module *mod)
1450 trace_module_free(mod);
1452 /* Delete from various lists */
1453 stop_machine(__unlink_module, mod, NULL);
1454 remove_notes_attrs(mod);
1455 remove_sect_attrs(mod);
1456 mod_kobject_remove(mod);
1458 /* Arch-specific cleanup. */
1459 module_arch_cleanup(mod);
1461 /* Module unload stuff */
1462 module_unload_free(mod);
1464 /* Free any allocated parameters. */
1465 destroy_params(mod->kp, mod->num_kp);
1467 /* This may be NULL, but that's OK */
1468 module_free(mod, mod->module_init);
1470 percpu_modfree(mod);
1471 #if defined(CONFIG_MODULE_UNLOAD)
1473 free_percpu(mod->refptr);
1475 /* Free lock-classes: */
1476 lockdep_free_key_range(mod->module_core, mod->core_size);
1478 /* Finally, free the core (containing the module structure) */
1479 module_free(mod, mod->module_core);
1482 update_protections(current->mm);
1486 void *__symbol_get(const char *symbol)
1488 struct module *owner;
1489 const struct kernel_symbol *sym;
1492 sym = find_symbol(symbol, &owner, NULL, true, true);
1493 if (sym && strong_try_module_get(owner))
1497 return sym ? (void *)sym->value : NULL;
1499 EXPORT_SYMBOL_GPL(__symbol_get);
1502 * Ensure that an exported symbol [global namespace] does not already exist
1503 * in the kernel or in some other module's exported symbol table.
1505 static int verify_export_symbols(struct module *mod)
1508 struct module *owner;
1509 const struct kernel_symbol *s;
1511 const struct kernel_symbol *sym;
1514 { mod->syms, mod->num_syms },
1515 { mod->gpl_syms, mod->num_gpl_syms },
1516 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1517 #ifdef CONFIG_UNUSED_SYMBOLS
1518 { mod->unused_syms, mod->num_unused_syms },
1519 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1523 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1524 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1525 if (find_symbol(s->name, &owner, NULL, true, false)) {
1527 "%s: exports duplicate symbol %s"
1529 mod->name, s->name, module_name(owner));
1537 /* Change all symbols so that st_value encodes the pointer directly. */
1538 static int simplify_symbols(Elf_Shdr *sechdrs,
1539 unsigned int symindex,
1541 unsigned int versindex,
1542 unsigned int pcpuindex,
1545 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1546 unsigned long secbase;
1547 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1549 const struct kernel_symbol *ksym;
1551 for (i = 1; i < n; i++) {
1552 switch (sym[i].st_shndx) {
1554 /* We compiled with -fno-common. These are not
1555 supposed to happen. */
1556 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1557 printk("%s: please compile with -fno-common\n",
1563 /* Don't need to do anything */
1564 DEBUGP("Absolute symbol: 0x%08lx\n",
1565 (long)sym[i].st_value);
1569 ksym = resolve_symbol(sechdrs, versindex,
1570 strtab + sym[i].st_name, mod);
1571 /* Ok if resolved. */
1573 sym[i].st_value = ksym->value;
1578 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1581 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1582 mod->name, strtab + sym[i].st_name);
1587 /* Divert to percpu allocation if a percpu var. */
1588 if (sym[i].st_shndx == pcpuindex)
1589 secbase = (unsigned long)mod_percpu(mod);
1591 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1592 sym[i].st_value += secbase;
1600 /* Additional bytes needed by arch in front of individual sections */
1601 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1602 unsigned int section)
1604 /* default implementation just returns zero */
1608 /* Update size with this section: return offset. */
1609 static long get_offset(struct module *mod, unsigned int *size,
1610 Elf_Shdr *sechdr, unsigned int section)
1614 *size += arch_mod_section_prepend(mod, section);
1615 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1616 *size = ret + sechdr->sh_size;
1620 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1621 might -- code, read-only data, read-write data, small data. Tally
1622 sizes, and place the offsets into sh_entsize fields: high bit means it
1624 static void layout_sections(struct module *mod,
1625 const Elf_Ehdr *hdr,
1627 const char *secstrings)
1629 static unsigned long const masks[][2] = {
1630 /* NOTE: all executable code must be the first section
1631 * in this array; otherwise modify the text_size
1632 * finder in the two loops below */
1633 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1634 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1635 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1636 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1640 for (i = 0; i < hdr->e_shnum; i++)
1641 sechdrs[i].sh_entsize = ~0UL;
1643 DEBUGP("Core section allocation order:\n");
1644 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1645 for (i = 0; i < hdr->e_shnum; ++i) {
1646 Elf_Shdr *s = &sechdrs[i];
1648 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1649 || (s->sh_flags & masks[m][1])
1650 || s->sh_entsize != ~0UL
1651 || strstarts(secstrings + s->sh_name, ".init"))
1653 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1654 DEBUGP("\t%s\n", secstrings + s->sh_name);
1657 mod->core_text_size = mod->core_size;
1660 DEBUGP("Init section allocation order:\n");
1661 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1662 for (i = 0; i < hdr->e_shnum; ++i) {
1663 Elf_Shdr *s = &sechdrs[i];
1665 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1666 || (s->sh_flags & masks[m][1])
1667 || s->sh_entsize != ~0UL
1668 || !strstarts(secstrings + s->sh_name, ".init"))
1670 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1671 | INIT_OFFSET_MASK);
1672 DEBUGP("\t%s\n", secstrings + s->sh_name);
1675 mod->init_text_size = mod->init_size;
1679 static void set_license(struct module *mod, const char *license)
1682 license = "unspecified";
1684 if (!license_is_gpl_compatible(license)) {
1685 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1686 printk(KERN_WARNING "%s: module license '%s' taints "
1687 "kernel.\n", mod->name, license);
1688 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1692 /* Parse tag=value strings from .modinfo section */
1693 static char *next_string(char *string, unsigned long *secsize)
1695 /* Skip non-zero chars */
1698 if ((*secsize)-- <= 1)
1702 /* Skip any zero padding. */
1703 while (!string[0]) {
1705 if ((*secsize)-- <= 1)
1711 static char *get_modinfo(Elf_Shdr *sechdrs,
1716 unsigned int taglen = strlen(tag);
1717 unsigned long size = sechdrs[info].sh_size;
1719 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1720 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1721 return p + taglen + 1;
1726 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1727 unsigned int infoindex)
1729 struct module_attribute *attr;
1732 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1735 get_modinfo(sechdrs,
1741 static void free_modinfo(struct module *mod)
1743 struct module_attribute *attr;
1746 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1752 #ifdef CONFIG_KALLSYMS
1754 /* lookup symbol in given range of kernel_symbols */
1755 static const struct kernel_symbol *lookup_symbol(const char *name,
1756 const struct kernel_symbol *start,
1757 const struct kernel_symbol *stop)
1759 const struct kernel_symbol *ks = start;
1760 for (; ks < stop; ks++)
1761 if (strcmp(ks->name, name) == 0)
1766 static int is_exported(const char *name, unsigned long value,
1767 const struct module *mod)
1769 const struct kernel_symbol *ks;
1771 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1773 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1774 return ks != NULL && ks->value == value;
1778 static char elf_type(const Elf_Sym *sym,
1780 const char *secstrings,
1783 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1784 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1789 if (sym->st_shndx == SHN_UNDEF)
1791 if (sym->st_shndx == SHN_ABS)
1793 if (sym->st_shndx >= SHN_LORESERVE)
1795 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1797 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1798 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1799 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1801 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1806 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1807 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1812 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1817 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1820 const Elf_Shdr *sec;
1822 if (src->st_shndx == SHN_UNDEF
1823 || src->st_shndx >= shnum
1827 sec = sechdrs + src->st_shndx;
1828 if (!(sec->sh_flags & SHF_ALLOC)
1829 #ifndef CONFIG_KALLSYMS_ALL
1830 || !(sec->sh_flags & SHF_EXECINSTR)
1832 || (sec->sh_entsize & INIT_OFFSET_MASK))
1838 static unsigned long layout_symtab(struct module *mod,
1840 unsigned int symindex,
1841 unsigned int strindex,
1842 const Elf_Ehdr *hdr,
1843 const char *secstrings,
1844 unsigned long *pstroffs,
1845 unsigned long *strmap)
1847 unsigned long symoffs;
1848 Elf_Shdr *symsect = sechdrs + symindex;
1849 Elf_Shdr *strsect = sechdrs + strindex;
1852 unsigned int i, nsrc, ndst;
1854 /* Put symbol section at end of init part of module. */
1855 symsect->sh_flags |= SHF_ALLOC;
1856 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1857 symindex) | INIT_OFFSET_MASK;
1858 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1860 src = (void *)hdr + symsect->sh_offset;
1861 nsrc = symsect->sh_size / sizeof(*src);
1862 strtab = (void *)hdr + strsect->sh_offset;
1863 for (ndst = i = 1; i < nsrc; ++i, ++src)
1864 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1865 unsigned int j = src->st_name;
1867 while(!__test_and_set_bit(j, strmap) && strtab[j])
1872 /* Append room for core symbols at end of core part. */
1873 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1874 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1876 /* Put string table section at end of init part of module. */
1877 strsect->sh_flags |= SHF_ALLOC;
1878 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1879 strindex) | INIT_OFFSET_MASK;
1880 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1882 /* Append room for core symbols' strings at end of core part. */
1883 *pstroffs = mod->core_size;
1884 __set_bit(0, strmap);
1885 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1890 static void add_kallsyms(struct module *mod,
1893 unsigned int symindex,
1894 unsigned int strindex,
1895 unsigned long symoffs,
1896 unsigned long stroffs,
1897 const char *secstrings,
1898 unsigned long *strmap)
1900 unsigned int i, ndst;
1905 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1906 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1907 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1909 /* Set types up while we still have access to sections. */
1910 for (i = 0; i < mod->num_symtab; i++)
1911 mod->symtab[i].st_info
1912 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1914 mod->core_symtab = dst = mod->module_core + symoffs;
1917 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1918 if (!is_core_symbol(src, sechdrs, shnum))
1921 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
1924 mod->core_num_syms = ndst;
1926 mod->core_strtab = s = mod->module_core + stroffs;
1927 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1928 if (test_bit(i, strmap))
1929 *++s = mod->strtab[i];
1932 static inline unsigned long layout_symtab(struct module *mod,
1934 unsigned int symindex,
1935 unsigned int strindex,
1936 const Elf_Ehdr *hdr,
1937 const char *secstrings,
1938 unsigned long *pstroffs,
1939 unsigned long *strmap)
1944 static inline void add_kallsyms(struct module *mod,
1947 unsigned int symindex,
1948 unsigned int strindex,
1949 unsigned long symoffs,
1950 unsigned long stroffs,
1951 const char *secstrings,
1952 const unsigned long *strmap)
1955 #endif /* CONFIG_KALLSYMS */
1957 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1959 #ifdef CONFIG_DYNAMIC_DEBUG
1960 if (ddebug_add_module(debug, num, debug->modname))
1961 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1966 static void *module_alloc_update_bounds(unsigned long size)
1968 void *ret = module_alloc(size);
1971 /* Update module bounds. */
1972 if ((unsigned long)ret < module_addr_min)
1973 module_addr_min = (unsigned long)ret;
1974 if ((unsigned long)ret + size > module_addr_max)
1975 module_addr_max = (unsigned long)ret + size;
1980 #ifdef CONFIG_DEBUG_KMEMLEAK
1981 static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1982 Elf_Shdr *sechdrs, char *secstrings)
1986 /* only scan the sections containing data */
1987 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
1989 for (i = 1; i < hdr->e_shnum; i++) {
1990 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1992 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
1993 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
1996 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
1997 sechdrs[i].sh_size, GFP_KERNEL);
2001 static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
2002 Elf_Shdr *sechdrs, char *secstrings)
2007 /* Allocate and load the module: note that size of section 0 is always
2008 zero, and we rely on this for optional sections. */
2009 static noinline struct module *load_module(void __user *umod,
2011 const char __user *uargs)
2015 char *secstrings, *args, *modmagic, *strtab = NULL;
2018 unsigned int symindex = 0;
2019 unsigned int strindex = 0;
2020 unsigned int modindex, versindex, infoindex, pcpuindex;
2023 void *ptr = NULL; /* Stops spurious gcc warning */
2024 unsigned long symoffs, stroffs, *strmap;
2026 mm_segment_t old_fs;
2028 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2030 if (len < sizeof(*hdr))
2031 return ERR_PTR(-ENOEXEC);
2033 /* Suck in entire file: we'll want most of it. */
2034 /* vmalloc barfs on "unusual" numbers. Check here */
2035 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
2036 return ERR_PTR(-ENOMEM);
2038 if (copy_from_user(hdr, umod, len) != 0) {
2043 /* Sanity checks against insmoding binaries or wrong arch,
2044 weird elf version */
2045 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
2046 || hdr->e_type != ET_REL
2047 || !elf_check_arch(hdr)
2048 || hdr->e_shentsize != sizeof(*sechdrs)) {
2053 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
2056 /* Convenience variables */
2057 sechdrs = (void *)hdr + hdr->e_shoff;
2058 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
2059 sechdrs[0].sh_addr = 0;
2061 for (i = 1; i < hdr->e_shnum; i++) {
2062 if (sechdrs[i].sh_type != SHT_NOBITS
2063 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
2066 /* Mark all sections sh_addr with their address in the
2068 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
2070 /* Internal symbols and strings. */
2071 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2073 strindex = sechdrs[i].sh_link;
2074 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2076 #ifndef CONFIG_MODULE_UNLOAD
2077 /* Don't load .exit sections */
2078 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
2079 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2083 modindex = find_sec(hdr, sechdrs, secstrings,
2084 ".gnu.linkonce.this_module");
2086 printk(KERN_WARNING "No module found in object\n");
2090 /* This is temporary: point mod into copy of data. */
2091 mod = (void *)sechdrs[modindex].sh_addr;
2093 if (symindex == 0) {
2094 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2100 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2101 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2102 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2104 /* Don't keep modinfo and version sections. */
2105 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2106 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2108 /* Check module struct version now, before we try to use module. */
2109 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2114 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2115 /* This is allowed: modprobe --force will invalidate it. */
2117 err = try_to_force_load(mod, "bad vermagic");
2120 } else if (!same_magic(modmagic, vermagic, versindex)) {
2121 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2122 mod->name, modmagic, vermagic);
2127 staging = get_modinfo(sechdrs, infoindex, "staging");
2129 add_taint_module(mod, TAINT_CRAP);
2130 printk(KERN_WARNING "%s: module is from the staging directory,"
2131 " the quality is unknown, you have been warned.\n",
2135 /* Now copy in args */
2136 args = strndup_user(uargs, ~0UL >> 1);
2138 err = PTR_ERR(args);
2142 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2143 * sizeof(long), GFP_KERNEL);
2149 if (find_module(mod->name)) {
2154 mod->state = MODULE_STATE_COMING;
2156 /* Allow arches to frob section contents and sizes. */
2157 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2162 /* We have a special allocation for this section. */
2163 err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size,
2164 sechdrs[pcpuindex].sh_addralign);
2167 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2170 /* Determine total sizes, and put offsets in sh_entsize. For now
2171 this is done generically; there doesn't appear to be any
2172 special cases for the architectures. */
2173 layout_sections(mod, hdr, sechdrs, secstrings);
2174 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2175 secstrings, &stroffs, strmap);
2177 /* Do the allocs. */
2178 ptr = module_alloc_update_bounds(mod->core_size);
2180 * The pointer to this block is stored in the module structure
2181 * which is inside the block. Just mark it as not being a
2184 kmemleak_not_leak(ptr);
2189 memset(ptr, 0, mod->core_size);
2190 mod->module_core = ptr;
2192 ptr = module_alloc_update_bounds(mod->init_size);
2194 * The pointer to this block is stored in the module structure
2195 * which is inside the block. This block doesn't need to be
2196 * scanned as it contains data and code that will be freed
2197 * after the module is initialized.
2199 kmemleak_ignore(ptr);
2200 if (!ptr && mod->init_size) {
2204 memset(ptr, 0, mod->init_size);
2205 mod->module_init = ptr;
2207 /* Transfer each section which specifies SHF_ALLOC */
2208 DEBUGP("final section addresses:\n");
2209 for (i = 0; i < hdr->e_shnum; i++) {
2212 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2215 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2216 dest = mod->module_init
2217 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2219 dest = mod->module_core + sechdrs[i].sh_entsize;
2221 if (sechdrs[i].sh_type != SHT_NOBITS)
2222 memcpy(dest, (void *)sechdrs[i].sh_addr,
2223 sechdrs[i].sh_size);
2224 /* Update sh_addr to point to copy in image. */
2225 sechdrs[i].sh_addr = (unsigned long)dest;
2226 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2228 /* Module has been moved. */
2229 mod = (void *)sechdrs[modindex].sh_addr;
2230 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2232 #if defined(CONFIG_MODULE_UNLOAD)
2233 mod->refptr = alloc_percpu(struct module_ref);
2239 /* Now we've moved module, initialize linked lists, etc. */
2240 module_unload_init(mod);
2242 /* add kobject, so we can reference it. */
2243 err = mod_sysfs_init(mod);
2247 /* Set up license info based on the info section */
2248 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2251 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2252 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2253 * using GPL-only symbols it needs.
2255 if (strcmp(mod->name, "ndiswrapper") == 0)
2256 add_taint(TAINT_PROPRIETARY_MODULE);
2258 /* driverloader was caught wrongly pretending to be under GPL */
2259 if (strcmp(mod->name, "driverloader") == 0)
2260 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2262 /* Set up MODINFO_ATTR fields */
2263 setup_modinfo(mod, sechdrs, infoindex);
2265 /* Fix up syms, so that st_value is a pointer to location. */
2266 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2271 /* Now we've got everything in the final locations, we can
2272 * find optional sections. */
2273 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2274 sizeof(*mod->kp), &mod->num_kp);
2275 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2276 sizeof(*mod->syms), &mod->num_syms);
2277 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2278 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2279 sizeof(*mod->gpl_syms),
2280 &mod->num_gpl_syms);
2281 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2282 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2283 "__ksymtab_gpl_future",
2284 sizeof(*mod->gpl_future_syms),
2285 &mod->num_gpl_future_syms);
2286 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2287 "__kcrctab_gpl_future");
2289 #ifdef CONFIG_UNUSED_SYMBOLS
2290 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2292 sizeof(*mod->unused_syms),
2293 &mod->num_unused_syms);
2294 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2295 "__kcrctab_unused");
2296 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2297 "__ksymtab_unused_gpl",
2298 sizeof(*mod->unused_gpl_syms),
2299 &mod->num_unused_gpl_syms);
2300 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2301 "__kcrctab_unused_gpl");
2303 #ifdef CONFIG_CONSTRUCTORS
2304 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2305 sizeof(*mod->ctors), &mod->num_ctors);
2308 #ifdef CONFIG_TRACEPOINTS
2309 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2311 sizeof(*mod->tracepoints),
2312 &mod->num_tracepoints);
2314 #ifdef CONFIG_EVENT_TRACING
2315 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2317 sizeof(*mod->trace_events),
2318 &mod->num_trace_events);
2320 * This section contains pointers to allocated objects in the trace
2321 * code and not scanning it leads to false positives.
2323 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2324 mod->num_trace_events, GFP_KERNEL);
2326 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2327 /* sechdrs[0].sh_size is always zero */
2328 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2330 sizeof(*mod->ftrace_callsites),
2331 &mod->num_ftrace_callsites);
2333 #ifdef CONFIG_MODVERSIONS
2334 if ((mod->num_syms && !mod->crcs)
2335 || (mod->num_gpl_syms && !mod->gpl_crcs)
2336 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2337 #ifdef CONFIG_UNUSED_SYMBOLS
2338 || (mod->num_unused_syms && !mod->unused_crcs)
2339 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2342 err = try_to_force_load(mod,
2343 "no versions for exported symbols");
2349 /* Now do relocations. */
2350 for (i = 1; i < hdr->e_shnum; i++) {
2351 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2352 unsigned int info = sechdrs[i].sh_info;
2354 /* Not a valid relocation section? */
2355 if (info >= hdr->e_shnum)
2358 /* Don't bother with non-allocated sections */
2359 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2362 if (sechdrs[i].sh_type == SHT_REL)
2363 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2364 else if (sechdrs[i].sh_type == SHT_RELA)
2365 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2371 /* Find duplicate symbols */
2372 err = verify_export_symbols(mod);
2376 /* Set up and sort exception table */
2377 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2378 sizeof(*mod->extable), &mod->num_exentries);
2379 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2381 /* Finally, copy percpu area over. */
2382 percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr,
2383 sechdrs[pcpuindex].sh_size);
2385 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2386 symoffs, stroffs, secstrings, strmap);
2391 struct _ddebug *debug;
2392 unsigned int num_debug;
2394 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2395 sizeof(*debug), &num_debug);
2397 dynamic_debug_setup(debug, num_debug);
2400 err = module_finalize(hdr, sechdrs, mod);
2404 /* flush the icache in correct context */
2409 * Flush the instruction cache, since we've played with text.
2410 * Do it before processing of module parameters, so the module
2411 * can provide parameter accessor functions of its own.
2413 if (mod->module_init)
2414 flush_icache_range((unsigned long)mod->module_init,
2415 (unsigned long)mod->module_init
2417 flush_icache_range((unsigned long)mod->module_core,
2418 (unsigned long)mod->module_core + mod->core_size);
2423 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2424 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2427 /* Now sew it into the lists so we can get lockdep and oops
2428 * info during argument parsing. Noone should access us, since
2429 * strong_try_module_get() will fail.
2430 * lockdep/oops can run asynchronous, so use the RCU list insertion
2431 * function to insert in a way safe to concurrent readers.
2432 * The mutex protects against concurrent writers.
2434 list_add_rcu(&mod->list, &modules);
2436 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2440 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2443 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2444 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2446 /* Get rid of temporary copy */
2449 trace_module_load(mod);
2455 /* Unlink carefully: kallsyms could be walking list. */
2456 list_del_rcu(&mod->list);
2457 synchronize_sched();
2458 module_arch_cleanup(mod);
2461 kobject_del(&mod->mkobj.kobj);
2462 kobject_put(&mod->mkobj.kobj);
2464 module_unload_free(mod);
2465 #if defined(CONFIG_MODULE_UNLOAD)
2466 free_percpu(mod->refptr);
2469 module_free(mod, mod->module_init);
2471 module_free(mod, mod->module_core);
2472 /* mod will be freed with core. Don't access it beyond this line! */
2474 percpu_modfree(mod);
2480 return ERR_PTR(err);
2483 printk(KERN_ERR "Module len %lu truncated\n", len);
2488 /* Call module constructors. */
2489 static void do_mod_ctors(struct module *mod)
2491 #ifdef CONFIG_CONSTRUCTORS
2494 for (i = 0; i < mod->num_ctors; i++)
2499 /* This is where the real work happens */
2500 SYSCALL_DEFINE3(init_module, void __user *, umod,
2501 unsigned long, len, const char __user *, uargs)
2506 /* Must have permission */
2507 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2510 /* Only one module load at a time, please */
2511 if (mutex_lock_interruptible(&module_mutex) != 0)
2514 /* Do all the hard work */
2515 mod = load_module(umod, len, uargs);
2517 mutex_unlock(&module_mutex);
2518 return PTR_ERR(mod);
2521 /* Drop lock so they can recurse */
2522 mutex_unlock(&module_mutex);
2524 blocking_notifier_call_chain(&module_notify_list,
2525 MODULE_STATE_COMING, mod);
2528 /* Start the module */
2529 if (mod->init != NULL)
2530 ret = do_one_initcall(mod->init);
2532 /* Init routine failed: abort. Try to protect us from
2533 buggy refcounters. */
2534 mod->state = MODULE_STATE_GOING;
2535 synchronize_sched();
2537 blocking_notifier_call_chain(&module_notify_list,
2538 MODULE_STATE_GOING, mod);
2539 mutex_lock(&module_mutex);
2541 mutex_unlock(&module_mutex);
2542 wake_up(&module_wq);
2547 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2548 "%s: loading module anyway...\n",
2549 __func__, mod->name, ret,
2554 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2555 mod->state = MODULE_STATE_LIVE;
2556 wake_up(&module_wq);
2557 blocking_notifier_call_chain(&module_notify_list,
2558 MODULE_STATE_LIVE, mod);
2560 /* We need to finish all async code before the module init sequence is done */
2561 async_synchronize_full();
2563 mutex_lock(&module_mutex);
2564 /* Drop initial reference. */
2566 trim_init_extable(mod);
2567 #ifdef CONFIG_KALLSYMS
2568 mod->num_symtab = mod->core_num_syms;
2569 mod->symtab = mod->core_symtab;
2570 mod->strtab = mod->core_strtab;
2572 module_free(mod, mod->module_init);
2573 mod->module_init = NULL;
2575 mod->init_text_size = 0;
2576 mutex_unlock(&module_mutex);
2581 static inline int within(unsigned long addr, void *start, unsigned long size)
2583 return ((void *)addr >= start && (void *)addr < start + size);
2586 #ifdef CONFIG_KALLSYMS
2588 * This ignores the intensely annoying "mapping symbols" found
2589 * in ARM ELF files: $a, $t and $d.
2591 static inline int is_arm_mapping_symbol(const char *str)
2593 return str[0] == '$' && strchr("atd", str[1])
2594 && (str[2] == '\0' || str[2] == '.');
2597 static const char *get_ksymbol(struct module *mod,
2599 unsigned long *size,
2600 unsigned long *offset)
2602 unsigned int i, best = 0;
2603 unsigned long nextval;
2605 /* At worse, next value is at end of module */
2606 if (within_module_init(addr, mod))
2607 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2609 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2611 /* Scan for closest preceeding symbol, and next symbol. (ELF
2612 starts real symbols at 1). */
2613 for (i = 1; i < mod->num_symtab; i++) {
2614 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2617 /* We ignore unnamed symbols: they're uninformative
2618 * and inserted at a whim. */
2619 if (mod->symtab[i].st_value <= addr
2620 && mod->symtab[i].st_value > mod->symtab[best].st_value
2621 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2622 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2624 if (mod->symtab[i].st_value > addr
2625 && mod->symtab[i].st_value < nextval
2626 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2627 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2628 nextval = mod->symtab[i].st_value;
2635 *size = nextval - mod->symtab[best].st_value;
2637 *offset = addr - mod->symtab[best].st_value;
2638 return mod->strtab + mod->symtab[best].st_name;
2641 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2642 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2643 const char *module_address_lookup(unsigned long addr,
2644 unsigned long *size,
2645 unsigned long *offset,
2650 const char *ret = NULL;
2653 list_for_each_entry_rcu(mod, &modules, list) {
2654 if (within_module_init(addr, mod) ||
2655 within_module_core(addr, mod)) {
2657 *modname = mod->name;
2658 ret = get_ksymbol(mod, addr, size, offset);
2662 /* Make a copy in here where it's safe */
2664 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2671 int lookup_module_symbol_name(unsigned long addr, char *symname)
2676 list_for_each_entry_rcu(mod, &modules, list) {
2677 if (within_module_init(addr, mod) ||
2678 within_module_core(addr, mod)) {
2681 sym = get_ksymbol(mod, addr, NULL, NULL);
2684 strlcpy(symname, sym, KSYM_NAME_LEN);
2694 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2695 unsigned long *offset, char *modname, char *name)
2700 list_for_each_entry_rcu(mod, &modules, list) {
2701 if (within_module_init(addr, mod) ||
2702 within_module_core(addr, mod)) {
2705 sym = get_ksymbol(mod, addr, size, offset);
2709 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2711 strlcpy(name, sym, KSYM_NAME_LEN);
2721 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2722 char *name, char *module_name, int *exported)
2727 list_for_each_entry_rcu(mod, &modules, list) {
2728 if (symnum < mod->num_symtab) {
2729 *value = mod->symtab[symnum].st_value;
2730 *type = mod->symtab[symnum].st_info;
2731 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2733 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2734 *exported = is_exported(name, *value, mod);
2738 symnum -= mod->num_symtab;
2744 static unsigned long mod_find_symname(struct module *mod, const char *name)
2748 for (i = 0; i < mod->num_symtab; i++)
2749 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2750 mod->symtab[i].st_info != 'U')
2751 return mod->symtab[i].st_value;
2755 /* Look for this name: can be of form module:name. */
2756 unsigned long module_kallsyms_lookup_name(const char *name)
2760 unsigned long ret = 0;
2762 /* Don't lock: we're in enough trouble already. */
2764 if ((colon = strchr(name, ':')) != NULL) {
2766 if ((mod = find_module(name)) != NULL)
2767 ret = mod_find_symname(mod, colon+1);
2770 list_for_each_entry_rcu(mod, &modules, list)
2771 if ((ret = mod_find_symname(mod, name)) != 0)
2778 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2779 struct module *, unsigned long),
2786 list_for_each_entry(mod, &modules, list) {
2787 for (i = 0; i < mod->num_symtab; i++) {
2788 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2789 mod, mod->symtab[i].st_value);
2796 #endif /* CONFIG_KALLSYMS */
2798 static char *module_flags(struct module *mod, char *buf)
2803 mod->state == MODULE_STATE_GOING ||
2804 mod->state == MODULE_STATE_COMING) {
2806 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2808 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2810 if (mod->taints & (1 << TAINT_CRAP))
2813 * TAINT_FORCED_RMMOD: could be added.
2814 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2818 /* Show a - for module-is-being-unloaded */
2819 if (mod->state == MODULE_STATE_GOING)
2821 /* Show a + for module-is-being-loaded */
2822 if (mod->state == MODULE_STATE_COMING)
2831 #ifdef CONFIG_PROC_FS
2832 /* Called by the /proc file system to return a list of modules. */
2833 static void *m_start(struct seq_file *m, loff_t *pos)
2835 mutex_lock(&module_mutex);
2836 return seq_list_start(&modules, *pos);
2839 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2841 return seq_list_next(p, &modules, pos);
2844 static void m_stop(struct seq_file *m, void *p)
2846 mutex_unlock(&module_mutex);
2849 static int m_show(struct seq_file *m, void *p)
2851 struct module *mod = list_entry(p, struct module, list);
2854 seq_printf(m, "%s %u",
2855 mod->name, mod->init_size + mod->core_size);
2856 print_unload_info(m, mod);
2858 /* Informative for users. */
2859 seq_printf(m, " %s",
2860 mod->state == MODULE_STATE_GOING ? "Unloading":
2861 mod->state == MODULE_STATE_COMING ? "Loading":
2863 /* Used by oprofile and other similar tools. */
2864 seq_printf(m, " 0x%p", mod->module_core);
2868 seq_printf(m, " %s", module_flags(mod, buf));
2870 seq_printf(m, "\n");
2874 /* Format: modulename size refcount deps address
2876 Where refcount is a number or -, and deps is a comma-separated list
2879 static const struct seq_operations modules_op = {
2886 static int modules_open(struct inode *inode, struct file *file)
2888 return seq_open(file, &modules_op);
2891 static const struct file_operations proc_modules_operations = {
2892 .open = modules_open,
2894 .llseek = seq_lseek,
2895 .release = seq_release,
2898 static int __init proc_modules_init(void)
2900 proc_create("modules", 0, NULL, &proc_modules_operations);
2903 module_init(proc_modules_init);
2906 /* Given an address, look for it in the module exception tables. */
2907 const struct exception_table_entry *search_module_extables(unsigned long addr)
2909 const struct exception_table_entry *e = NULL;
2913 list_for_each_entry_rcu(mod, &modules, list) {
2914 if (mod->num_exentries == 0)
2917 e = search_extable(mod->extable,
2918 mod->extable + mod->num_exentries - 1,
2925 /* Now, if we found one, we are running inside it now, hence
2926 we cannot unload the module, hence no refcnt needed. */
2931 * is_module_address - is this address inside a module?
2932 * @addr: the address to check.
2934 * See is_module_text_address() if you simply want to see if the address
2935 * is code (not data).
2937 bool is_module_address(unsigned long addr)
2942 ret = __module_address(addr) != NULL;
2949 * __module_address - get the module which contains an address.
2950 * @addr: the address.
2952 * Must be called with preempt disabled or module mutex held so that
2953 * module doesn't get freed during this.
2955 struct module *__module_address(unsigned long addr)
2959 if (addr < module_addr_min || addr > module_addr_max)
2962 list_for_each_entry_rcu(mod, &modules, list)
2963 if (within_module_core(addr, mod)
2964 || within_module_init(addr, mod))
2968 EXPORT_SYMBOL_GPL(__module_address);
2971 * is_module_text_address - is this address inside module code?
2972 * @addr: the address to check.
2974 * See is_module_address() if you simply want to see if the address is
2975 * anywhere in a module. See kernel_text_address() for testing if an
2976 * address corresponds to kernel or module code.
2978 bool is_module_text_address(unsigned long addr)
2983 ret = __module_text_address(addr) != NULL;
2990 * __module_text_address - get the module whose code contains an address.
2991 * @addr: the address.
2993 * Must be called with preempt disabled or module mutex held so that
2994 * module doesn't get freed during this.
2996 struct module *__module_text_address(unsigned long addr)
2998 struct module *mod = __module_address(addr);
3000 /* Make sure it's within the text section. */
3001 if (!within(addr, mod->module_init, mod->init_text_size)
3002 && !within(addr, mod->module_core, mod->core_text_size))
3007 EXPORT_SYMBOL_GPL(__module_text_address);
3009 /* Don't grab lock, we're oopsing. */
3010 void print_modules(void)
3015 printk(KERN_DEFAULT "Modules linked in:");
3016 /* Most callers should already have preempt disabled, but make sure */
3018 list_for_each_entry_rcu(mod, &modules, list)
3019 printk(" %s%s", mod->name, module_flags(mod, buf));
3021 if (last_unloaded_module[0])
3022 printk(" [last unloaded: %s]", last_unloaded_module);
3026 #ifdef CONFIG_MODVERSIONS
3027 /* Generate the signature for all relevant module structures here.
3028 * If these change, we don't want to try to parse the module. */
3029 void module_layout(struct module *mod,
3030 struct modversion_info *ver,
3031 struct kernel_param *kp,
3032 struct kernel_symbol *ks,
3033 struct tracepoint *tp)
3036 EXPORT_SYMBOL(module_layout);
3039 #ifdef CONFIG_TRACEPOINTS
3040 void module_update_tracepoints(void)
3044 mutex_lock(&module_mutex);
3045 list_for_each_entry(mod, &modules, list)
3047 tracepoint_update_probe_range(mod->tracepoints,
3048 mod->tracepoints + mod->num_tracepoints);
3049 mutex_unlock(&module_mutex);
3053 * Returns 0 if current not found.
3054 * Returns 1 if current found.
3056 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
3058 struct module *iter_mod;
3061 mutex_lock(&module_mutex);
3062 list_for_each_entry(iter_mod, &modules, list) {
3063 if (!iter_mod->taints) {
3065 * Sorted module list
3067 if (iter_mod < iter->module)
3069 else if (iter_mod > iter->module)
3070 iter->tracepoint = NULL;
3071 found = tracepoint_get_iter_range(&iter->tracepoint,
3072 iter_mod->tracepoints,
3073 iter_mod->tracepoints
3074 + iter_mod->num_tracepoints);
3076 iter->module = iter_mod;
3081 mutex_unlock(&module_mutex);