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/init.h>
22 #include <linux/kallsyms.h>
24 #include <linux/sysfs.h>
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/elf.h>
29 #include <linux/proc_fs.h>
30 #include <linux/seq_file.h>
31 #include <linux/syscalls.h>
32 #include <linux/fcntl.h>
33 #include <linux/rcupdate.h>
34 #include <linux/capability.h>
35 #include <linux/cpu.h>
36 #include <linux/moduleparam.h>
37 #include <linux/errno.h>
38 #include <linux/err.h>
39 #include <linux/vermagic.h>
40 #include <linux/notifier.h>
41 #include <linux/sched.h>
42 #include <linux/stop_machine.h>
43 #include <linux/device.h>
44 #include <linux/string.h>
45 #include <linux/mutex.h>
46 #include <linux/rculist.h>
47 #include <asm/uaccess.h>
48 #include <asm/cacheflush.h>
49 #include <linux/license.h>
50 #include <asm/sections.h>
51 #include <linux/tracepoint.h>
52 #include <linux/ftrace.h>
53 #include <linux/async.h>
54 #include <linux/percpu.h>
59 #define DEBUGP(fmt , a...)
62 #ifndef ARCH_SHF_SMALL
63 #define ARCH_SHF_SMALL 0
66 /* If this is set, the section belongs in the init part of the module */
67 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
69 /* List of modules, protected by module_mutex or preempt_disable
70 * (delete uses stop_machine/add uses RCU list operations). */
71 DEFINE_MUTEX(module_mutex);
72 EXPORT_SYMBOL_GPL(module_mutex);
73 static LIST_HEAD(modules);
75 /* Waiting for a module to finish initializing? */
76 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
78 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
80 /* Bounds of module allocation, for speeding __module_address */
81 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
83 int register_module_notifier(struct notifier_block * nb)
85 return blocking_notifier_chain_register(&module_notify_list, nb);
87 EXPORT_SYMBOL(register_module_notifier);
89 int unregister_module_notifier(struct notifier_block * nb)
91 return blocking_notifier_chain_unregister(&module_notify_list, nb);
93 EXPORT_SYMBOL(unregister_module_notifier);
95 /* We require a truly strong try_module_get(): 0 means failure due to
96 ongoing or failed initialization etc. */
97 static inline int strong_try_module_get(struct module *mod)
99 if (mod && mod->state == MODULE_STATE_COMING)
101 if (try_module_get(mod))
107 static inline void add_taint_module(struct module *mod, unsigned flag)
110 mod->taints |= (1U << flag);
114 * A thread that wants to hold a reference to a module only while it
115 * is running can call this to safely exit. nfsd and lockd use this.
117 void __module_put_and_exit(struct module *mod, long code)
122 EXPORT_SYMBOL(__module_put_and_exit);
124 /* Find a module section: 0 means not found. */
125 static unsigned int find_sec(Elf_Ehdr *hdr,
127 const char *secstrings,
132 for (i = 1; i < hdr->e_shnum; i++)
133 /* Alloc bit cleared means "ignore it." */
134 if ((sechdrs[i].sh_flags & SHF_ALLOC)
135 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
140 /* Find a module section, or NULL. */
141 static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
142 const char *secstrings, const char *name)
144 /* Section 0 has sh_addr 0. */
145 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
148 /* Find a module section, or NULL. Fill in number of "objects" in section. */
149 static void *section_objs(Elf_Ehdr *hdr,
151 const char *secstrings,
156 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
158 /* Section 0 has sh_addr 0 and sh_size 0. */
159 *num = sechdrs[sec].sh_size / object_size;
160 return (void *)sechdrs[sec].sh_addr;
163 /* Provided by the linker */
164 extern const struct kernel_symbol __start___ksymtab[];
165 extern const struct kernel_symbol __stop___ksymtab[];
166 extern const struct kernel_symbol __start___ksymtab_gpl[];
167 extern const struct kernel_symbol __stop___ksymtab_gpl[];
168 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
169 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
170 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
171 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
172 extern const unsigned long __start___kcrctab[];
173 extern const unsigned long __start___kcrctab_gpl[];
174 extern const unsigned long __start___kcrctab_gpl_future[];
175 #ifdef CONFIG_UNUSED_SYMBOLS
176 extern const struct kernel_symbol __start___ksymtab_unused[];
177 extern const struct kernel_symbol __stop___ksymtab_unused[];
178 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
179 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
180 extern const unsigned long __start___kcrctab_unused[];
181 extern const unsigned long __start___kcrctab_unused_gpl[];
184 #ifndef CONFIG_MODVERSIONS
185 #define symversion(base, idx) NULL
187 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
190 static bool each_symbol_in_section(const struct symsearch *arr,
191 unsigned int arrsize,
192 struct module *owner,
193 bool (*fn)(const struct symsearch *syms,
194 struct module *owner,
195 unsigned int symnum, void *data),
200 for (j = 0; j < arrsize; j++) {
201 for (i = 0; i < arr[j].stop - arr[j].start; i++)
202 if (fn(&arr[j], owner, i, data))
209 /* Returns true as soon as fn returns true, otherwise false. */
210 bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
211 unsigned int symnum, void *data), void *data)
214 const struct symsearch arr[] = {
215 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
216 NOT_GPL_ONLY, false },
217 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
218 __start___kcrctab_gpl,
220 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
221 __start___kcrctab_gpl_future,
222 WILL_BE_GPL_ONLY, false },
223 #ifdef CONFIG_UNUSED_SYMBOLS
224 { __start___ksymtab_unused, __stop___ksymtab_unused,
225 __start___kcrctab_unused,
226 NOT_GPL_ONLY, true },
227 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
228 __start___kcrctab_unused_gpl,
233 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
236 list_for_each_entry_rcu(mod, &modules, list) {
237 struct symsearch arr[] = {
238 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
239 NOT_GPL_ONLY, false },
240 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
243 { mod->gpl_future_syms,
244 mod->gpl_future_syms + mod->num_gpl_future_syms,
245 mod->gpl_future_crcs,
246 WILL_BE_GPL_ONLY, false },
247 #ifdef CONFIG_UNUSED_SYMBOLS
249 mod->unused_syms + mod->num_unused_syms,
251 NOT_GPL_ONLY, true },
252 { mod->unused_gpl_syms,
253 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
254 mod->unused_gpl_crcs,
259 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
264 EXPORT_SYMBOL_GPL(each_symbol);
266 struct find_symbol_arg {
273 struct module *owner;
274 const unsigned long *crc;
275 const struct kernel_symbol *sym;
278 static bool find_symbol_in_section(const struct symsearch *syms,
279 struct module *owner,
280 unsigned int symnum, void *data)
282 struct find_symbol_arg *fsa = data;
284 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
288 if (syms->licence == GPL_ONLY)
290 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
291 printk(KERN_WARNING "Symbol %s is being used "
292 "by a non-GPL module, which will not "
293 "be allowed in the future\n", fsa->name);
294 printk(KERN_WARNING "Please see the file "
295 "Documentation/feature-removal-schedule.txt "
296 "in the kernel source tree for more details.\n");
300 #ifdef CONFIG_UNUSED_SYMBOLS
301 if (syms->unused && fsa->warn) {
302 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
303 "however this module is using it.\n", fsa->name);
305 "This symbol will go away in the future.\n");
307 "Please evalute if this is the right api to use and if "
308 "it really is, submit a report the linux kernel "
309 "mailinglist together with submitting your code for "
315 fsa->crc = symversion(syms->crcs, symnum);
316 fsa->sym = &syms->start[symnum];
320 /* Find a symbol and return it, along with, (optional) crc and
321 * (optional) module which owns it */
322 const struct kernel_symbol *find_symbol(const char *name,
323 struct module **owner,
324 const unsigned long **crc,
328 struct find_symbol_arg fsa;
334 if (each_symbol(find_symbol_in_section, &fsa)) {
342 DEBUGP("Failed to find symbol %s\n", name);
345 EXPORT_SYMBOL_GPL(find_symbol);
347 /* Search for module by name: must hold module_mutex. */
348 struct module *find_module(const char *name)
352 list_for_each_entry(mod, &modules, list) {
353 if (strcmp(mod->name, name) == 0)
358 EXPORT_SYMBOL_GPL(find_module);
362 #ifdef CONFIG_HAVE_DYNAMIC_PER_CPU_AREA
364 static void *percpu_modalloc(unsigned long size, unsigned long align,
369 if (align > PAGE_SIZE) {
370 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
371 name, align, PAGE_SIZE);
375 ptr = __alloc_reserved_percpu(size, align);
378 "Could not allocate %lu bytes percpu data\n", size);
382 static void percpu_modfree(void *freeme)
387 #else /* ... !CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
389 /* Number of blocks used and allocated. */
390 static unsigned int pcpu_num_used, pcpu_num_allocated;
391 /* Size of each block. -ve means used. */
392 static int *pcpu_size;
394 static int split_block(unsigned int i, unsigned short size)
396 /* Reallocation required? */
397 if (pcpu_num_used + 1 > pcpu_num_allocated) {
400 new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
405 pcpu_num_allocated *= 2;
409 /* Insert a new subblock */
410 memmove(&pcpu_size[i+1], &pcpu_size[i],
411 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
414 pcpu_size[i+1] -= size;
419 static inline unsigned int block_size(int val)
426 static void *percpu_modalloc(unsigned long size, unsigned long align,
433 if (align > PAGE_SIZE) {
434 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
435 name, align, PAGE_SIZE);
439 ptr = __per_cpu_start;
440 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
441 /* Extra for alignment requirement. */
442 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
443 BUG_ON(i == 0 && extra != 0);
445 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
448 /* Transfer extra to previous block. */
449 if (pcpu_size[i-1] < 0)
450 pcpu_size[i-1] -= extra;
452 pcpu_size[i-1] += extra;
453 pcpu_size[i] -= extra;
456 /* Split block if warranted */
457 if (pcpu_size[i] - size > sizeof(unsigned long))
458 if (!split_block(i, size))
462 pcpu_size[i] = -pcpu_size[i];
466 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
471 static void percpu_modfree(void *freeme)
474 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
476 /* First entry is core kernel percpu data. */
477 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
479 pcpu_size[i] = -pcpu_size[i];
486 /* Merge with previous? */
487 if (pcpu_size[i-1] >= 0) {
488 pcpu_size[i-1] += pcpu_size[i];
490 memmove(&pcpu_size[i], &pcpu_size[i+1],
491 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
494 /* Merge with next? */
495 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
496 pcpu_size[i] += pcpu_size[i+1];
498 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
499 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
503 static int percpu_modinit(void)
506 pcpu_num_allocated = 2;
507 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
509 /* Static in-kernel percpu data (used). */
510 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
512 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
513 if (pcpu_size[1] < 0) {
514 printk(KERN_ERR "No per-cpu room for modules.\n");
520 __initcall(percpu_modinit);
522 #endif /* CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
524 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
526 const char *secstrings)
528 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
531 static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
535 for_each_possible_cpu(cpu)
536 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
539 #else /* ... !CONFIG_SMP */
541 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
546 static inline void percpu_modfree(void *pcpuptr)
550 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
552 const char *secstrings)
556 static inline void percpu_modcopy(void *pcpudst, const void *src,
559 /* pcpusec should be 0, and size of that section should be 0. */
563 #endif /* CONFIG_SMP */
565 #define MODINFO_ATTR(field) \
566 static void setup_modinfo_##field(struct module *mod, const char *s) \
568 mod->field = kstrdup(s, GFP_KERNEL); \
570 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
571 struct module *mod, char *buffer) \
573 return sprintf(buffer, "%s\n", mod->field); \
575 static int modinfo_##field##_exists(struct module *mod) \
577 return mod->field != NULL; \
579 static void free_modinfo_##field(struct module *mod) \
584 static struct module_attribute modinfo_##field = { \
585 .attr = { .name = __stringify(field), .mode = 0444 }, \
586 .show = show_modinfo_##field, \
587 .setup = setup_modinfo_##field, \
588 .test = modinfo_##field##_exists, \
589 .free = free_modinfo_##field, \
592 MODINFO_ATTR(version);
593 MODINFO_ATTR(srcversion);
595 static char last_unloaded_module[MODULE_NAME_LEN+1];
597 #ifdef CONFIG_MODULE_UNLOAD
598 /* Init the unload section of the module. */
599 static void module_unload_init(struct module *mod)
603 INIT_LIST_HEAD(&mod->modules_which_use_me);
604 for_each_possible_cpu(cpu)
605 local_set(__module_ref_addr(mod, cpu), 0);
606 /* Hold reference count during initialization. */
607 local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1);
608 /* Backwards compatibility macros put refcount during init. */
609 mod->waiter = current;
612 /* modules using other modules */
615 struct list_head list;
616 struct module *module_which_uses;
619 /* Does a already use b? */
620 static int already_uses(struct module *a, struct module *b)
622 struct module_use *use;
624 list_for_each_entry(use, &b->modules_which_use_me, list) {
625 if (use->module_which_uses == a) {
626 DEBUGP("%s uses %s!\n", a->name, b->name);
630 DEBUGP("%s does not use %s!\n", a->name, b->name);
634 /* Module a uses b */
635 int use_module(struct module *a, struct module *b)
637 struct module_use *use;
640 if (b == NULL || already_uses(a, b)) return 1;
642 /* If we're interrupted or time out, we fail. */
643 if (wait_event_interruptible_timeout(
644 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
646 printk("%s: gave up waiting for init of module %s.\n",
651 /* If strong_try_module_get() returned a different error, we fail. */
655 DEBUGP("Allocating new usage for %s.\n", a->name);
656 use = kmalloc(sizeof(*use), GFP_ATOMIC);
658 printk("%s: out of memory loading\n", a->name);
663 use->module_which_uses = a;
664 list_add(&use->list, &b->modules_which_use_me);
665 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
668 EXPORT_SYMBOL_GPL(use_module);
670 /* Clear the unload stuff of the module. */
671 static void module_unload_free(struct module *mod)
675 list_for_each_entry(i, &modules, list) {
676 struct module_use *use;
678 list_for_each_entry(use, &i->modules_which_use_me, list) {
679 if (use->module_which_uses == mod) {
680 DEBUGP("%s unusing %s\n", mod->name, i->name);
682 list_del(&use->list);
684 sysfs_remove_link(i->holders_dir, mod->name);
685 /* There can be at most one match. */
692 #ifdef CONFIG_MODULE_FORCE_UNLOAD
693 static inline int try_force_unload(unsigned int flags)
695 int ret = (flags & O_TRUNC);
697 add_taint(TAINT_FORCED_RMMOD);
701 static inline int try_force_unload(unsigned int flags)
705 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
714 /* Whole machine is stopped with interrupts off when this runs. */
715 static int __try_stop_module(void *_sref)
717 struct stopref *sref = _sref;
719 /* If it's not unused, quit unless we're forcing. */
720 if (module_refcount(sref->mod) != 0) {
721 if (!(*sref->forced = try_force_unload(sref->flags)))
725 /* Mark it as dying. */
726 sref->mod->state = MODULE_STATE_GOING;
730 static int try_stop_module(struct module *mod, int flags, int *forced)
732 if (flags & O_NONBLOCK) {
733 struct stopref sref = { mod, flags, forced };
735 return stop_machine(__try_stop_module, &sref, NULL);
737 /* We don't need to stop the machine for this. */
738 mod->state = MODULE_STATE_GOING;
744 unsigned int module_refcount(struct module *mod)
746 unsigned int total = 0;
749 for_each_possible_cpu(cpu)
750 total += local_read(__module_ref_addr(mod, cpu));
753 EXPORT_SYMBOL(module_refcount);
755 /* This exists whether we can unload or not */
756 static void free_module(struct module *mod);
758 static void wait_for_zero_refcount(struct module *mod)
760 /* Since we might sleep for some time, release the mutex first */
761 mutex_unlock(&module_mutex);
763 DEBUGP("Looking at refcount...\n");
764 set_current_state(TASK_UNINTERRUPTIBLE);
765 if (module_refcount(mod) == 0)
769 current->state = TASK_RUNNING;
770 mutex_lock(&module_mutex);
773 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
777 char name[MODULE_NAME_LEN];
780 if (!capable(CAP_SYS_MODULE))
783 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
785 name[MODULE_NAME_LEN-1] = '\0';
787 /* Create stop_machine threads since free_module relies on
788 * a non-failing stop_machine call. */
789 ret = stop_machine_create();
793 if (mutex_lock_interruptible(&module_mutex) != 0) {
798 mod = find_module(name);
804 if (!list_empty(&mod->modules_which_use_me)) {
805 /* Other modules depend on us: get rid of them first. */
810 /* Doing init or already dying? */
811 if (mod->state != MODULE_STATE_LIVE) {
812 /* FIXME: if (force), slam module count and wake up
814 DEBUGP("%s already dying\n", mod->name);
819 /* If it has an init func, it must have an exit func to unload */
820 if (mod->init && !mod->exit) {
821 forced = try_force_unload(flags);
823 /* This module can't be removed */
829 /* Set this up before setting mod->state */
830 mod->waiter = current;
832 /* Stop the machine so refcounts can't move and disable module. */
833 ret = try_stop_module(mod, flags, &forced);
837 /* Never wait if forced. */
838 if (!forced && module_refcount(mod) != 0)
839 wait_for_zero_refcount(mod);
841 mutex_unlock(&module_mutex);
842 /* Final destruction now noone is using it. */
843 if (mod->exit != NULL)
845 blocking_notifier_call_chain(&module_notify_list,
846 MODULE_STATE_GOING, mod);
847 async_synchronize_full();
848 mutex_lock(&module_mutex);
849 /* Store the name of the last unloaded module for diagnostic purposes */
850 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
851 ddebug_remove_module(mod->name);
855 mutex_unlock(&module_mutex);
857 stop_machine_destroy();
861 static inline void print_unload_info(struct seq_file *m, struct module *mod)
863 struct module_use *use;
864 int printed_something = 0;
866 seq_printf(m, " %u ", module_refcount(mod));
868 /* Always include a trailing , so userspace can differentiate
869 between this and the old multi-field proc format. */
870 list_for_each_entry(use, &mod->modules_which_use_me, list) {
871 printed_something = 1;
872 seq_printf(m, "%s,", use->module_which_uses->name);
875 if (mod->init != NULL && mod->exit == NULL) {
876 printed_something = 1;
877 seq_printf(m, "[permanent],");
880 if (!printed_something)
884 void __symbol_put(const char *symbol)
886 struct module *owner;
889 if (!find_symbol(symbol, &owner, NULL, true, false))
894 EXPORT_SYMBOL(__symbol_put);
896 void symbol_put_addr(void *addr)
898 struct module *modaddr;
900 if (core_kernel_text((unsigned long)addr))
903 /* module_text_address is safe here: we're supposed to have reference
904 * to module from symbol_get, so it can't go away. */
905 modaddr = __module_text_address((unsigned long)addr);
909 EXPORT_SYMBOL_GPL(symbol_put_addr);
911 static ssize_t show_refcnt(struct module_attribute *mattr,
912 struct module *mod, char *buffer)
914 return sprintf(buffer, "%u\n", module_refcount(mod));
917 static struct module_attribute refcnt = {
918 .attr = { .name = "refcnt", .mode = 0444 },
922 void module_put(struct module *module)
925 unsigned int cpu = get_cpu();
926 local_dec(__module_ref_addr(module, cpu));
927 /* Maybe they're waiting for us to drop reference? */
928 if (unlikely(!module_is_live(module)))
929 wake_up_process(module->waiter);
933 EXPORT_SYMBOL(module_put);
935 #else /* !CONFIG_MODULE_UNLOAD */
936 static inline void print_unload_info(struct seq_file *m, struct module *mod)
938 /* We don't know the usage count, or what modules are using. */
939 seq_printf(m, " - -");
942 static inline void module_unload_free(struct module *mod)
946 int use_module(struct module *a, struct module *b)
948 return strong_try_module_get(b) == 0;
950 EXPORT_SYMBOL_GPL(use_module);
952 static inline void module_unload_init(struct module *mod)
955 #endif /* CONFIG_MODULE_UNLOAD */
957 static ssize_t show_initstate(struct module_attribute *mattr,
958 struct module *mod, char *buffer)
960 const char *state = "unknown";
962 switch (mod->state) {
963 case MODULE_STATE_LIVE:
966 case MODULE_STATE_COMING:
969 case MODULE_STATE_GOING:
973 return sprintf(buffer, "%s\n", state);
976 static struct module_attribute initstate = {
977 .attr = { .name = "initstate", .mode = 0444 },
978 .show = show_initstate,
981 static struct module_attribute *modinfo_attrs[] = {
985 #ifdef CONFIG_MODULE_UNLOAD
991 static const char vermagic[] = VERMAGIC_STRING;
993 static int try_to_force_load(struct module *mod, const char *reason)
995 #ifdef CONFIG_MODULE_FORCE_LOAD
996 if (!test_taint(TAINT_FORCED_MODULE))
997 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
999 add_taint_module(mod, TAINT_FORCED_MODULE);
1006 #ifdef CONFIG_MODVERSIONS
1007 static int check_version(Elf_Shdr *sechdrs,
1008 unsigned int versindex,
1009 const char *symname,
1011 const unsigned long *crc)
1013 unsigned int i, num_versions;
1014 struct modversion_info *versions;
1016 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1020 /* No versions at all? modprobe --force does this. */
1022 return try_to_force_load(mod, symname) == 0;
1024 versions = (void *) sechdrs[versindex].sh_addr;
1025 num_versions = sechdrs[versindex].sh_size
1026 / sizeof(struct modversion_info);
1028 for (i = 0; i < num_versions; i++) {
1029 if (strcmp(versions[i].name, symname) != 0)
1032 if (versions[i].crc == *crc)
1034 DEBUGP("Found checksum %lX vs module %lX\n",
1035 *crc, versions[i].crc);
1039 printk(KERN_WARNING "%s: no symbol version for %s\n",
1040 mod->name, symname);
1044 printk("%s: disagrees about version of symbol %s\n",
1045 mod->name, symname);
1049 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1050 unsigned int versindex,
1053 const unsigned long *crc;
1055 if (!find_symbol("module_layout", NULL, &crc, true, false))
1057 return check_version(sechdrs, versindex, "module_layout", mod, crc);
1060 /* First part is kernel version, which we ignore if module has crcs. */
1061 static inline int same_magic(const char *amagic, const char *bmagic,
1065 amagic += strcspn(amagic, " ");
1066 bmagic += strcspn(bmagic, " ");
1068 return strcmp(amagic, bmagic) == 0;
1071 static inline int check_version(Elf_Shdr *sechdrs,
1072 unsigned int versindex,
1073 const char *symname,
1075 const unsigned long *crc)
1080 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1081 unsigned int versindex,
1087 static inline int same_magic(const char *amagic, const char *bmagic,
1090 return strcmp(amagic, bmagic) == 0;
1092 #endif /* CONFIG_MODVERSIONS */
1094 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1095 Must be holding module_mutex. */
1096 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
1097 unsigned int versindex,
1101 struct module *owner;
1102 const struct kernel_symbol *sym;
1103 const unsigned long *crc;
1105 sym = find_symbol(name, &owner, &crc,
1106 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1107 /* use_module can fail due to OOM,
1108 or module initialization or unloading */
1110 if (!check_version(sechdrs, versindex, name, mod, crc) ||
1111 !use_module(mod, owner))
1118 * /sys/module/foo/sections stuff
1119 * J. Corbet <corbet@lwn.net>
1121 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1122 struct module_sect_attr
1124 struct module_attribute mattr;
1126 unsigned long address;
1129 struct module_sect_attrs
1131 struct attribute_group grp;
1132 unsigned int nsections;
1133 struct module_sect_attr attrs[0];
1136 static ssize_t module_sect_show(struct module_attribute *mattr,
1137 struct module *mod, char *buf)
1139 struct module_sect_attr *sattr =
1140 container_of(mattr, struct module_sect_attr, mattr);
1141 return sprintf(buf, "0x%lx\n", sattr->address);
1144 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1146 unsigned int section;
1148 for (section = 0; section < sect_attrs->nsections; section++)
1149 kfree(sect_attrs->attrs[section].name);
1153 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1154 char *secstrings, Elf_Shdr *sechdrs)
1156 unsigned int nloaded = 0, i, size[2];
1157 struct module_sect_attrs *sect_attrs;
1158 struct module_sect_attr *sattr;
1159 struct attribute **gattr;
1161 /* Count loaded sections and allocate structures */
1162 for (i = 0; i < nsect; i++)
1163 if (sechdrs[i].sh_flags & SHF_ALLOC)
1165 size[0] = ALIGN(sizeof(*sect_attrs)
1166 + nloaded * sizeof(sect_attrs->attrs[0]),
1167 sizeof(sect_attrs->grp.attrs[0]));
1168 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1169 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1170 if (sect_attrs == NULL)
1173 /* Setup section attributes. */
1174 sect_attrs->grp.name = "sections";
1175 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1177 sect_attrs->nsections = 0;
1178 sattr = §_attrs->attrs[0];
1179 gattr = §_attrs->grp.attrs[0];
1180 for (i = 0; i < nsect; i++) {
1181 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1183 sattr->address = sechdrs[i].sh_addr;
1184 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1186 if (sattr->name == NULL)
1188 sect_attrs->nsections++;
1189 sattr->mattr.show = module_sect_show;
1190 sattr->mattr.store = NULL;
1191 sattr->mattr.attr.name = sattr->name;
1192 sattr->mattr.attr.mode = S_IRUGO;
1193 *(gattr++) = &(sattr++)->mattr.attr;
1197 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1200 mod->sect_attrs = sect_attrs;
1203 free_sect_attrs(sect_attrs);
1206 static void remove_sect_attrs(struct module *mod)
1208 if (mod->sect_attrs) {
1209 sysfs_remove_group(&mod->mkobj.kobj,
1210 &mod->sect_attrs->grp);
1211 /* We are positive that no one is using any sect attrs
1212 * at this point. Deallocate immediately. */
1213 free_sect_attrs(mod->sect_attrs);
1214 mod->sect_attrs = NULL;
1219 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1222 struct module_notes_attrs {
1223 struct kobject *dir;
1225 struct bin_attribute attrs[0];
1228 static ssize_t module_notes_read(struct kobject *kobj,
1229 struct bin_attribute *bin_attr,
1230 char *buf, loff_t pos, size_t count)
1233 * The caller checked the pos and count against our size.
1235 memcpy(buf, bin_attr->private + pos, count);
1239 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1242 if (notes_attrs->dir) {
1244 sysfs_remove_bin_file(notes_attrs->dir,
1245 ¬es_attrs->attrs[i]);
1246 kobject_put(notes_attrs->dir);
1251 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1252 char *secstrings, Elf_Shdr *sechdrs)
1254 unsigned int notes, loaded, i;
1255 struct module_notes_attrs *notes_attrs;
1256 struct bin_attribute *nattr;
1258 /* Count notes sections and allocate structures. */
1260 for (i = 0; i < nsect; i++)
1261 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1262 (sechdrs[i].sh_type == SHT_NOTE))
1268 notes_attrs = kzalloc(sizeof(*notes_attrs)
1269 + notes * sizeof(notes_attrs->attrs[0]),
1271 if (notes_attrs == NULL)
1274 notes_attrs->notes = notes;
1275 nattr = ¬es_attrs->attrs[0];
1276 for (loaded = i = 0; i < nsect; ++i) {
1277 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1279 if (sechdrs[i].sh_type == SHT_NOTE) {
1280 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1281 nattr->attr.mode = S_IRUGO;
1282 nattr->size = sechdrs[i].sh_size;
1283 nattr->private = (void *) sechdrs[i].sh_addr;
1284 nattr->read = module_notes_read;
1290 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1291 if (!notes_attrs->dir)
1294 for (i = 0; i < notes; ++i)
1295 if (sysfs_create_bin_file(notes_attrs->dir,
1296 ¬es_attrs->attrs[i]))
1299 mod->notes_attrs = notes_attrs;
1303 free_notes_attrs(notes_attrs, i);
1306 static void remove_notes_attrs(struct module *mod)
1308 if (mod->notes_attrs)
1309 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1314 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1315 char *sectstrings, Elf_Shdr *sechdrs)
1319 static inline void remove_sect_attrs(struct module *mod)
1323 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1324 char *sectstrings, Elf_Shdr *sechdrs)
1328 static inline void remove_notes_attrs(struct module *mod)
1334 int module_add_modinfo_attrs(struct module *mod)
1336 struct module_attribute *attr;
1337 struct module_attribute *temp_attr;
1341 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1342 (ARRAY_SIZE(modinfo_attrs) + 1)),
1344 if (!mod->modinfo_attrs)
1347 temp_attr = mod->modinfo_attrs;
1348 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1350 (attr->test && attr->test(mod))) {
1351 memcpy(temp_attr, attr, sizeof(*temp_attr));
1352 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1359 void module_remove_modinfo_attrs(struct module *mod)
1361 struct module_attribute *attr;
1364 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1365 /* pick a field to test for end of list */
1366 if (!attr->attr.name)
1368 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1372 kfree(mod->modinfo_attrs);
1375 int mod_sysfs_init(struct module *mod)
1378 struct kobject *kobj;
1380 if (!module_sysfs_initialized) {
1381 printk(KERN_ERR "%s: module sysfs not initialized\n",
1387 kobj = kset_find_obj(module_kset, mod->name);
1389 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1395 mod->mkobj.mod = mod;
1397 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1398 mod->mkobj.kobj.kset = module_kset;
1399 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1402 kobject_put(&mod->mkobj.kobj);
1404 /* delay uevent until full sysfs population */
1409 int mod_sysfs_setup(struct module *mod,
1410 struct kernel_param *kparam,
1411 unsigned int num_params)
1415 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1416 if (!mod->holders_dir) {
1421 err = module_param_sysfs_setup(mod, kparam, num_params);
1423 goto out_unreg_holders;
1425 err = module_add_modinfo_attrs(mod);
1427 goto out_unreg_param;
1429 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1433 module_param_sysfs_remove(mod);
1435 kobject_put(mod->holders_dir);
1437 kobject_put(&mod->mkobj.kobj);
1441 static void mod_sysfs_fini(struct module *mod)
1443 kobject_put(&mod->mkobj.kobj);
1446 #else /* CONFIG_SYSFS */
1448 static void mod_sysfs_fini(struct module *mod)
1452 #endif /* CONFIG_SYSFS */
1454 static void mod_kobject_remove(struct module *mod)
1456 module_remove_modinfo_attrs(mod);
1457 module_param_sysfs_remove(mod);
1458 kobject_put(mod->mkobj.drivers_dir);
1459 kobject_put(mod->holders_dir);
1460 mod_sysfs_fini(mod);
1464 * unlink the module with the whole machine is stopped with interrupts off
1465 * - this defends against kallsyms not taking locks
1467 static int __unlink_module(void *_mod)
1469 struct module *mod = _mod;
1470 list_del(&mod->list);
1474 /* Free a module, remove from lists, etc (must hold module_mutex). */
1475 static void free_module(struct module *mod)
1477 /* Delete from various lists */
1478 stop_machine(__unlink_module, mod, NULL);
1479 remove_notes_attrs(mod);
1480 remove_sect_attrs(mod);
1481 mod_kobject_remove(mod);
1483 /* Arch-specific cleanup. */
1484 module_arch_cleanup(mod);
1486 /* Module unload stuff */
1487 module_unload_free(mod);
1489 /* Free any allocated parameters. */
1490 destroy_params(mod->kp, mod->num_kp);
1492 /* release any pointers to mcount in this module */
1493 ftrace_release(mod->module_core, mod->core_size);
1495 /* This may be NULL, but that's OK */
1496 module_free(mod, mod->module_init);
1499 percpu_modfree(mod->percpu);
1500 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
1502 percpu_modfree(mod->refptr);
1504 /* Free lock-classes: */
1505 lockdep_free_key_range(mod->module_core, mod->core_size);
1507 /* Finally, free the core (containing the module structure) */
1508 module_free(mod, mod->module_core);
1511 void *__symbol_get(const char *symbol)
1513 struct module *owner;
1514 const struct kernel_symbol *sym;
1517 sym = find_symbol(symbol, &owner, NULL, true, true);
1518 if (sym && strong_try_module_get(owner))
1522 return sym ? (void *)sym->value : NULL;
1524 EXPORT_SYMBOL_GPL(__symbol_get);
1527 * Ensure that an exported symbol [global namespace] does not already exist
1528 * in the kernel or in some other module's exported symbol table.
1530 static int verify_export_symbols(struct module *mod)
1533 struct module *owner;
1534 const struct kernel_symbol *s;
1536 const struct kernel_symbol *sym;
1539 { mod->syms, mod->num_syms },
1540 { mod->gpl_syms, mod->num_gpl_syms },
1541 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1542 #ifdef CONFIG_UNUSED_SYMBOLS
1543 { mod->unused_syms, mod->num_unused_syms },
1544 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1548 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1549 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1550 if (find_symbol(s->name, &owner, NULL, true, false)) {
1552 "%s: exports duplicate symbol %s"
1554 mod->name, s->name, module_name(owner));
1562 /* Change all symbols so that st_value encodes the pointer directly. */
1563 static int simplify_symbols(Elf_Shdr *sechdrs,
1564 unsigned int symindex,
1566 unsigned int versindex,
1567 unsigned int pcpuindex,
1570 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1571 unsigned long secbase;
1572 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1574 const struct kernel_symbol *ksym;
1576 for (i = 1; i < n; i++) {
1577 switch (sym[i].st_shndx) {
1579 /* We compiled with -fno-common. These are not
1580 supposed to happen. */
1581 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1582 printk("%s: please compile with -fno-common\n",
1588 /* Don't need to do anything */
1589 DEBUGP("Absolute symbol: 0x%08lx\n",
1590 (long)sym[i].st_value);
1594 ksym = resolve_symbol(sechdrs, versindex,
1595 strtab + sym[i].st_name, mod);
1596 /* Ok if resolved. */
1598 sym[i].st_value = ksym->value;
1603 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1606 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1607 mod->name, strtab + sym[i].st_name);
1612 /* Divert to percpu allocation if a percpu var. */
1613 if (sym[i].st_shndx == pcpuindex)
1614 secbase = (unsigned long)mod->percpu;
1616 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1617 sym[i].st_value += secbase;
1625 /* Additional bytes needed by arch in front of individual sections */
1626 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1627 unsigned int section)
1629 /* default implementation just returns zero */
1633 /* Update size with this section: return offset. */
1634 static long get_offset(struct module *mod, unsigned int *size,
1635 Elf_Shdr *sechdr, unsigned int section)
1639 *size += arch_mod_section_prepend(mod, section);
1640 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1641 *size = ret + sechdr->sh_size;
1645 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1646 might -- code, read-only data, read-write data, small data. Tally
1647 sizes, and place the offsets into sh_entsize fields: high bit means it
1649 static void layout_sections(struct module *mod,
1650 const Elf_Ehdr *hdr,
1652 const char *secstrings)
1654 static unsigned long const masks[][2] = {
1655 /* NOTE: all executable code must be the first section
1656 * in this array; otherwise modify the text_size
1657 * finder in the two loops below */
1658 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1659 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1660 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1661 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1665 for (i = 0; i < hdr->e_shnum; i++)
1666 sechdrs[i].sh_entsize = ~0UL;
1668 DEBUGP("Core section allocation order:\n");
1669 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1670 for (i = 0; i < hdr->e_shnum; ++i) {
1671 Elf_Shdr *s = &sechdrs[i];
1673 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1674 || (s->sh_flags & masks[m][1])
1675 || s->sh_entsize != ~0UL
1676 || strncmp(secstrings + s->sh_name,
1679 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1680 DEBUGP("\t%s\n", secstrings + s->sh_name);
1683 mod->core_text_size = mod->core_size;
1686 DEBUGP("Init section allocation order:\n");
1687 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1688 for (i = 0; i < hdr->e_shnum; ++i) {
1689 Elf_Shdr *s = &sechdrs[i];
1691 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1692 || (s->sh_flags & masks[m][1])
1693 || s->sh_entsize != ~0UL
1694 || strncmp(secstrings + s->sh_name,
1697 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1698 | INIT_OFFSET_MASK);
1699 DEBUGP("\t%s\n", secstrings + s->sh_name);
1702 mod->init_text_size = mod->init_size;
1706 static void set_license(struct module *mod, const char *license)
1709 license = "unspecified";
1711 if (!license_is_gpl_compatible(license)) {
1712 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1713 printk(KERN_WARNING "%s: module license '%s' taints "
1714 "kernel.\n", mod->name, license);
1715 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1719 /* Parse tag=value strings from .modinfo section */
1720 static char *next_string(char *string, unsigned long *secsize)
1722 /* Skip non-zero chars */
1725 if ((*secsize)-- <= 1)
1729 /* Skip any zero padding. */
1730 while (!string[0]) {
1732 if ((*secsize)-- <= 1)
1738 static char *get_modinfo(Elf_Shdr *sechdrs,
1743 unsigned int taglen = strlen(tag);
1744 unsigned long size = sechdrs[info].sh_size;
1746 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1747 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1748 return p + taglen + 1;
1753 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1754 unsigned int infoindex)
1756 struct module_attribute *attr;
1759 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1762 get_modinfo(sechdrs,
1768 #ifdef CONFIG_KALLSYMS
1770 /* lookup symbol in given range of kernel_symbols */
1771 static const struct kernel_symbol *lookup_symbol(const char *name,
1772 const struct kernel_symbol *start,
1773 const struct kernel_symbol *stop)
1775 const struct kernel_symbol *ks = start;
1776 for (; ks < stop; ks++)
1777 if (strcmp(ks->name, name) == 0)
1782 static int is_exported(const char *name, unsigned long value,
1783 const struct module *mod)
1785 const struct kernel_symbol *ks;
1787 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1789 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1790 return ks != NULL && ks->value == value;
1794 static char elf_type(const Elf_Sym *sym,
1796 const char *secstrings,
1799 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1800 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1805 if (sym->st_shndx == SHN_UNDEF)
1807 if (sym->st_shndx == SHN_ABS)
1809 if (sym->st_shndx >= SHN_LORESERVE)
1811 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1813 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1814 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1815 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1817 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1822 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1823 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1828 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1829 ".debug", strlen(".debug")) == 0)
1834 static void add_kallsyms(struct module *mod,
1836 unsigned int symindex,
1837 unsigned int strindex,
1838 const char *secstrings)
1842 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1843 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1844 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1846 /* Set types up while we still have access to sections. */
1847 for (i = 0; i < mod->num_symtab; i++)
1848 mod->symtab[i].st_info
1849 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1852 static inline void add_kallsyms(struct module *mod,
1854 unsigned int symindex,
1855 unsigned int strindex,
1856 const char *secstrings)
1859 #endif /* CONFIG_KALLSYMS */
1861 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1863 #ifdef CONFIG_DYNAMIC_DEBUG
1864 if (ddebug_add_module(debug, num, debug->modname))
1865 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1870 static void *module_alloc_update_bounds(unsigned long size)
1872 void *ret = module_alloc(size);
1875 /* Update module bounds. */
1876 if ((unsigned long)ret < module_addr_min)
1877 module_addr_min = (unsigned long)ret;
1878 if ((unsigned long)ret + size > module_addr_max)
1879 module_addr_max = (unsigned long)ret + size;
1884 /* Allocate and load the module: note that size of section 0 is always
1885 zero, and we rely on this for optional sections. */
1886 static noinline struct module *load_module(void __user *umod,
1888 const char __user *uargs)
1892 char *secstrings, *args, *modmagic, *strtab = NULL;
1895 unsigned int symindex = 0;
1896 unsigned int strindex = 0;
1897 unsigned int modindex, versindex, infoindex, pcpuindex;
1898 unsigned int num_mcount;
1901 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1902 unsigned long *mseg;
1903 mm_segment_t old_fs;
1905 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1907 if (len < sizeof(*hdr))
1908 return ERR_PTR(-ENOEXEC);
1910 /* Suck in entire file: we'll want most of it. */
1911 /* vmalloc barfs on "unusual" numbers. Check here */
1912 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1913 return ERR_PTR(-ENOMEM);
1915 if (copy_from_user(hdr, umod, len) != 0) {
1920 /* Sanity checks against insmoding binaries or wrong arch,
1921 weird elf version */
1922 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1923 || hdr->e_type != ET_REL
1924 || !elf_check_arch(hdr)
1925 || hdr->e_shentsize != sizeof(*sechdrs)) {
1930 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1933 /* Convenience variables */
1934 sechdrs = (void *)hdr + hdr->e_shoff;
1935 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1936 sechdrs[0].sh_addr = 0;
1938 for (i = 1; i < hdr->e_shnum; i++) {
1939 if (sechdrs[i].sh_type != SHT_NOBITS
1940 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1943 /* Mark all sections sh_addr with their address in the
1945 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1947 /* Internal symbols and strings. */
1948 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1950 strindex = sechdrs[i].sh_link;
1951 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1953 #ifndef CONFIG_MODULE_UNLOAD
1954 /* Don't load .exit sections */
1955 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1956 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1958 /* Don't keep __versions around; it's just for loading. */
1959 if (strcmp(secstrings + sechdrs[i].sh_name, "__versions") == 0)
1960 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1963 modindex = find_sec(hdr, sechdrs, secstrings,
1964 ".gnu.linkonce.this_module");
1966 printk(KERN_WARNING "No module found in object\n");
1970 /* This is temporary: point mod into copy of data. */
1971 mod = (void *)sechdrs[modindex].sh_addr;
1973 if (symindex == 0) {
1974 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1980 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1981 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1982 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1984 /* Don't keep modinfo and version sections. */
1985 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1986 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1987 #ifdef CONFIG_KALLSYMS
1988 /* Keep symbol and string tables for decoding later. */
1989 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1990 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1993 /* Check module struct version now, before we try to use module. */
1994 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1999 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2000 /* This is allowed: modprobe --force will invalidate it. */
2002 err = try_to_force_load(mod, "bad vermagic");
2005 } else if (!same_magic(modmagic, vermagic, versindex)) {
2006 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2007 mod->name, modmagic, vermagic);
2012 staging = get_modinfo(sechdrs, infoindex, "staging");
2014 add_taint_module(mod, TAINT_CRAP);
2015 printk(KERN_WARNING "%s: module is from the staging directory,"
2016 " the quality is unknown, you have been warned.\n",
2020 /* Now copy in args */
2021 args = strndup_user(uargs, ~0UL >> 1);
2023 err = PTR_ERR(args);
2027 if (find_module(mod->name)) {
2032 mod->state = MODULE_STATE_COMING;
2034 /* Allow arches to frob section contents and sizes. */
2035 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2040 /* We have a special allocation for this section. */
2041 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2042 sechdrs[pcpuindex].sh_addralign,
2048 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2049 mod->percpu = percpu;
2052 /* Determine total sizes, and put offsets in sh_entsize. For now
2053 this is done generically; there doesn't appear to be any
2054 special cases for the architectures. */
2055 layout_sections(mod, hdr, sechdrs, secstrings);
2057 /* Do the allocs. */
2058 ptr = module_alloc_update_bounds(mod->core_size);
2063 memset(ptr, 0, mod->core_size);
2064 mod->module_core = ptr;
2066 ptr = module_alloc_update_bounds(mod->init_size);
2067 if (!ptr && mod->init_size) {
2071 memset(ptr, 0, mod->init_size);
2072 mod->module_init = ptr;
2074 /* Transfer each section which specifies SHF_ALLOC */
2075 DEBUGP("final section addresses:\n");
2076 for (i = 0; i < hdr->e_shnum; i++) {
2079 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2082 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2083 dest = mod->module_init
2084 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2086 dest = mod->module_core + sechdrs[i].sh_entsize;
2088 if (sechdrs[i].sh_type != SHT_NOBITS)
2089 memcpy(dest, (void *)sechdrs[i].sh_addr,
2090 sechdrs[i].sh_size);
2091 /* Update sh_addr to point to copy in image. */
2092 sechdrs[i].sh_addr = (unsigned long)dest;
2093 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2095 /* Module has been moved. */
2096 mod = (void *)sechdrs[modindex].sh_addr;
2098 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2099 mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
2106 /* Now we've moved module, initialize linked lists, etc. */
2107 module_unload_init(mod);
2109 /* add kobject, so we can reference it. */
2110 err = mod_sysfs_init(mod);
2114 /* Set up license info based on the info section */
2115 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2118 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2119 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2120 * using GPL-only symbols it needs.
2122 if (strcmp(mod->name, "ndiswrapper") == 0)
2123 add_taint(TAINT_PROPRIETARY_MODULE);
2125 /* driverloader was caught wrongly pretending to be under GPL */
2126 if (strcmp(mod->name, "driverloader") == 0)
2127 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2129 /* Set up MODINFO_ATTR fields */
2130 setup_modinfo(mod, sechdrs, infoindex);
2132 /* Fix up syms, so that st_value is a pointer to location. */
2133 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2138 /* Now we've got everything in the final locations, we can
2139 * find optional sections. */
2140 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2141 sizeof(*mod->kp), &mod->num_kp);
2142 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2143 sizeof(*mod->syms), &mod->num_syms);
2144 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2145 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2146 sizeof(*mod->gpl_syms),
2147 &mod->num_gpl_syms);
2148 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2149 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2150 "__ksymtab_gpl_future",
2151 sizeof(*mod->gpl_future_syms),
2152 &mod->num_gpl_future_syms);
2153 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2154 "__kcrctab_gpl_future");
2156 #ifdef CONFIG_UNUSED_SYMBOLS
2157 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2159 sizeof(*mod->unused_syms),
2160 &mod->num_unused_syms);
2161 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2162 "__kcrctab_unused");
2163 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2164 "__ksymtab_unused_gpl",
2165 sizeof(*mod->unused_gpl_syms),
2166 &mod->num_unused_gpl_syms);
2167 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2168 "__kcrctab_unused_gpl");
2171 #ifdef CONFIG_MARKERS
2172 mod->markers = section_objs(hdr, sechdrs, secstrings, "__markers",
2173 sizeof(*mod->markers), &mod->num_markers);
2175 #ifdef CONFIG_TRACEPOINTS
2176 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2178 sizeof(*mod->tracepoints),
2179 &mod->num_tracepoints);
2182 #ifdef CONFIG_MODVERSIONS
2183 if ((mod->num_syms && !mod->crcs)
2184 || (mod->num_gpl_syms && !mod->gpl_crcs)
2185 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2186 #ifdef CONFIG_UNUSED_SYMBOLS
2187 || (mod->num_unused_syms && !mod->unused_crcs)
2188 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2191 err = try_to_force_load(mod,
2192 "no versions for exported symbols");
2198 /* Now do relocations. */
2199 for (i = 1; i < hdr->e_shnum; i++) {
2200 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2201 unsigned int info = sechdrs[i].sh_info;
2203 /* Not a valid relocation section? */
2204 if (info >= hdr->e_shnum)
2207 /* Don't bother with non-allocated sections */
2208 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2211 if (sechdrs[i].sh_type == SHT_REL)
2212 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2213 else if (sechdrs[i].sh_type == SHT_RELA)
2214 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2220 /* Find duplicate symbols */
2221 err = verify_export_symbols(mod);
2225 /* Set up and sort exception table */
2226 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2227 sizeof(*mod->extable), &mod->num_exentries);
2228 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2230 /* Finally, copy percpu area over. */
2231 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2232 sechdrs[pcpuindex].sh_size);
2234 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
2237 struct _ddebug *debug;
2238 unsigned int num_debug;
2240 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2241 sizeof(*debug), &num_debug);
2243 dynamic_debug_setup(debug, num_debug);
2246 /* sechdrs[0].sh_size is always zero */
2247 mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc",
2248 sizeof(*mseg), &num_mcount);
2249 ftrace_init_module(mod, mseg, mseg + num_mcount);
2251 err = module_finalize(hdr, sechdrs, mod);
2255 /* flush the icache in correct context */
2260 * Flush the instruction cache, since we've played with text.
2261 * Do it before processing of module parameters, so the module
2262 * can provide parameter accessor functions of its own.
2264 if (mod->module_init)
2265 flush_icache_range((unsigned long)mod->module_init,
2266 (unsigned long)mod->module_init
2268 flush_icache_range((unsigned long)mod->module_core,
2269 (unsigned long)mod->module_core + mod->core_size);
2274 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2275 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2278 /* Now sew it into the lists so we can get lockdep and oops
2279 * info during argument parsing. Noone should access us, since
2280 * strong_try_module_get() will fail.
2281 * lockdep/oops can run asynchronous, so use the RCU list insertion
2282 * function to insert in a way safe to concurrent readers.
2283 * The mutex protects against concurrent writers.
2285 list_add_rcu(&mod->list, &modules);
2287 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2291 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2294 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2295 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2297 /* Get rid of temporary copy */
2304 /* Unlink carefully: kallsyms could be walking list. */
2305 list_del_rcu(&mod->list);
2306 synchronize_sched();
2307 module_arch_cleanup(mod);
2309 kobject_del(&mod->mkobj.kobj);
2310 kobject_put(&mod->mkobj.kobj);
2311 ftrace_release(mod->module_core, mod->core_size);
2313 module_unload_free(mod);
2314 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2316 percpu_modfree(mod->refptr);
2318 module_free(mod, mod->module_init);
2320 module_free(mod, mod->module_core);
2321 /* mod will be freed with core. Don't access it beyond this line! */
2324 percpu_modfree(percpu);
2329 return ERR_PTR(err);
2332 printk(KERN_ERR "Module len %lu truncated\n", len);
2337 /* This is where the real work happens */
2338 SYSCALL_DEFINE3(init_module, void __user *, umod,
2339 unsigned long, len, const char __user *, uargs)
2344 /* Must have permission */
2345 if (!capable(CAP_SYS_MODULE))
2348 /* Only one module load at a time, please */
2349 if (mutex_lock_interruptible(&module_mutex) != 0)
2352 /* Do all the hard work */
2353 mod = load_module(umod, len, uargs);
2355 mutex_unlock(&module_mutex);
2356 return PTR_ERR(mod);
2359 /* Drop lock so they can recurse */
2360 mutex_unlock(&module_mutex);
2362 blocking_notifier_call_chain(&module_notify_list,
2363 MODULE_STATE_COMING, mod);
2365 /* Start the module */
2366 if (mod->init != NULL)
2367 ret = do_one_initcall(mod->init);
2369 /* Init routine failed: abort. Try to protect us from
2370 buggy refcounters. */
2371 mod->state = MODULE_STATE_GOING;
2372 synchronize_sched();
2374 blocking_notifier_call_chain(&module_notify_list,
2375 MODULE_STATE_GOING, mod);
2376 mutex_lock(&module_mutex);
2378 mutex_unlock(&module_mutex);
2379 wake_up(&module_wq);
2383 printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, "
2384 "it should follow 0/-E convention\n"
2385 KERN_WARNING "%s: loading module anyway...\n",
2386 __func__, mod->name, ret,
2391 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2392 mod->state = MODULE_STATE_LIVE;
2393 wake_up(&module_wq);
2394 blocking_notifier_call_chain(&module_notify_list,
2395 MODULE_STATE_LIVE, mod);
2397 mutex_lock(&module_mutex);
2398 /* Drop initial reference. */
2400 module_free(mod, mod->module_init);
2401 mod->module_init = NULL;
2403 mod->init_text_size = 0;
2404 mutex_unlock(&module_mutex);
2409 static inline int within(unsigned long addr, void *start, unsigned long size)
2411 return ((void *)addr >= start && (void *)addr < start + size);
2414 #ifdef CONFIG_KALLSYMS
2416 * This ignores the intensely annoying "mapping symbols" found
2417 * in ARM ELF files: $a, $t and $d.
2419 static inline int is_arm_mapping_symbol(const char *str)
2421 return str[0] == '$' && strchr("atd", str[1])
2422 && (str[2] == '\0' || str[2] == '.');
2425 static const char *get_ksymbol(struct module *mod,
2427 unsigned long *size,
2428 unsigned long *offset)
2430 unsigned int i, best = 0;
2431 unsigned long nextval;
2433 /* At worse, next value is at end of module */
2434 if (within_module_init(addr, mod))
2435 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2437 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2439 /* Scan for closest preceeding symbol, and next symbol. (ELF
2440 starts real symbols at 1). */
2441 for (i = 1; i < mod->num_symtab; i++) {
2442 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2445 /* We ignore unnamed symbols: they're uninformative
2446 * and inserted at a whim. */
2447 if (mod->symtab[i].st_value <= addr
2448 && mod->symtab[i].st_value > mod->symtab[best].st_value
2449 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2450 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2452 if (mod->symtab[i].st_value > addr
2453 && mod->symtab[i].st_value < nextval
2454 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2455 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2456 nextval = mod->symtab[i].st_value;
2463 *size = nextval - mod->symtab[best].st_value;
2465 *offset = addr - mod->symtab[best].st_value;
2466 return mod->strtab + mod->symtab[best].st_name;
2469 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2470 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2471 const char *module_address_lookup(unsigned long addr,
2472 unsigned long *size,
2473 unsigned long *offset,
2478 const char *ret = NULL;
2481 list_for_each_entry_rcu(mod, &modules, list) {
2482 if (within_module_init(addr, mod) ||
2483 within_module_core(addr, mod)) {
2485 *modname = mod->name;
2486 ret = get_ksymbol(mod, addr, size, offset);
2490 /* Make a copy in here where it's safe */
2492 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2499 int lookup_module_symbol_name(unsigned long addr, char *symname)
2504 list_for_each_entry_rcu(mod, &modules, list) {
2505 if (within_module_init(addr, mod) ||
2506 within_module_core(addr, mod)) {
2509 sym = get_ksymbol(mod, addr, NULL, NULL);
2512 strlcpy(symname, sym, KSYM_NAME_LEN);
2522 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2523 unsigned long *offset, char *modname, char *name)
2528 list_for_each_entry_rcu(mod, &modules, list) {
2529 if (within_module_init(addr, mod) ||
2530 within_module_core(addr, mod)) {
2533 sym = get_ksymbol(mod, addr, size, offset);
2537 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2539 strlcpy(name, sym, KSYM_NAME_LEN);
2549 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2550 char *name, char *module_name, int *exported)
2555 list_for_each_entry_rcu(mod, &modules, list) {
2556 if (symnum < mod->num_symtab) {
2557 *value = mod->symtab[symnum].st_value;
2558 *type = mod->symtab[symnum].st_info;
2559 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2561 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2562 *exported = is_exported(name, *value, mod);
2566 symnum -= mod->num_symtab;
2572 static unsigned long mod_find_symname(struct module *mod, const char *name)
2576 for (i = 0; i < mod->num_symtab; i++)
2577 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2578 mod->symtab[i].st_info != 'U')
2579 return mod->symtab[i].st_value;
2583 /* Look for this name: can be of form module:name. */
2584 unsigned long module_kallsyms_lookup_name(const char *name)
2588 unsigned long ret = 0;
2590 /* Don't lock: we're in enough trouble already. */
2592 if ((colon = strchr(name, ':')) != NULL) {
2594 if ((mod = find_module(name)) != NULL)
2595 ret = mod_find_symname(mod, colon+1);
2598 list_for_each_entry_rcu(mod, &modules, list)
2599 if ((ret = mod_find_symname(mod, name)) != 0)
2606 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2607 struct module *, unsigned long),
2614 list_for_each_entry(mod, &modules, list) {
2615 for (i = 0; i < mod->num_symtab; i++) {
2616 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2617 mod, mod->symtab[i].st_value);
2624 #endif /* CONFIG_KALLSYMS */
2626 static char *module_flags(struct module *mod, char *buf)
2631 mod->state == MODULE_STATE_GOING ||
2632 mod->state == MODULE_STATE_COMING) {
2634 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2636 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2638 if (mod->taints & (1 << TAINT_CRAP))
2641 * TAINT_FORCED_RMMOD: could be added.
2642 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2646 /* Show a - for module-is-being-unloaded */
2647 if (mod->state == MODULE_STATE_GOING)
2649 /* Show a + for module-is-being-loaded */
2650 if (mod->state == MODULE_STATE_COMING)
2659 #ifdef CONFIG_PROC_FS
2660 /* Called by the /proc file system to return a list of modules. */
2661 static void *m_start(struct seq_file *m, loff_t *pos)
2663 mutex_lock(&module_mutex);
2664 return seq_list_start(&modules, *pos);
2667 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2669 return seq_list_next(p, &modules, pos);
2672 static void m_stop(struct seq_file *m, void *p)
2674 mutex_unlock(&module_mutex);
2677 static int m_show(struct seq_file *m, void *p)
2679 struct module *mod = list_entry(p, struct module, list);
2682 seq_printf(m, "%s %u",
2683 mod->name, mod->init_size + mod->core_size);
2684 print_unload_info(m, mod);
2686 /* Informative for users. */
2687 seq_printf(m, " %s",
2688 mod->state == MODULE_STATE_GOING ? "Unloading":
2689 mod->state == MODULE_STATE_COMING ? "Loading":
2691 /* Used by oprofile and other similar tools. */
2692 seq_printf(m, " 0x%p", mod->module_core);
2696 seq_printf(m, " %s", module_flags(mod, buf));
2698 seq_printf(m, "\n");
2702 /* Format: modulename size refcount deps address
2704 Where refcount is a number or -, and deps is a comma-separated list
2707 static const struct seq_operations modules_op = {
2714 static int modules_open(struct inode *inode, struct file *file)
2716 return seq_open(file, &modules_op);
2719 static const struct file_operations proc_modules_operations = {
2720 .open = modules_open,
2722 .llseek = seq_lseek,
2723 .release = seq_release,
2726 static int __init proc_modules_init(void)
2728 proc_create("modules", 0, NULL, &proc_modules_operations);
2731 module_init(proc_modules_init);
2734 /* Given an address, look for it in the module exception tables. */
2735 const struct exception_table_entry *search_module_extables(unsigned long addr)
2737 const struct exception_table_entry *e = NULL;
2741 list_for_each_entry_rcu(mod, &modules, list) {
2742 if (mod->num_exentries == 0)
2745 e = search_extable(mod->extable,
2746 mod->extable + mod->num_exentries - 1,
2753 /* Now, if we found one, we are running inside it now, hence
2754 we cannot unload the module, hence no refcnt needed. */
2759 * is_module_address - is this address inside a module?
2760 * @addr: the address to check.
2762 * See is_module_text_address() if you simply want to see if the address
2763 * is code (not data).
2765 bool is_module_address(unsigned long addr)
2770 ret = __module_address(addr) != NULL;
2777 * __module_address - get the module which contains an address.
2778 * @addr: the address.
2780 * Must be called with preempt disabled or module mutex held so that
2781 * module doesn't get freed during this.
2783 __notrace_funcgraph struct module *__module_address(unsigned long addr)
2787 if (addr < module_addr_min || addr > module_addr_max)
2790 list_for_each_entry_rcu(mod, &modules, list)
2791 if (within_module_core(addr, mod)
2792 || within_module_init(addr, mod))
2796 EXPORT_SYMBOL_GPL(__module_address);
2799 * is_module_text_address - is this address inside module code?
2800 * @addr: the address to check.
2802 * See is_module_address() if you simply want to see if the address is
2803 * anywhere in a module. See kernel_text_address() for testing if an
2804 * address corresponds to kernel or module code.
2806 bool is_module_text_address(unsigned long addr)
2811 ret = __module_text_address(addr) != NULL;
2818 * __module_text_address - get the module whose code contains an address.
2819 * @addr: the address.
2821 * Must be called with preempt disabled or module mutex held so that
2822 * module doesn't get freed during this.
2824 struct module *__module_text_address(unsigned long addr)
2826 struct module *mod = __module_address(addr);
2828 /* Make sure it's within the text section. */
2829 if (!within(addr, mod->module_init, mod->init_text_size)
2830 && !within(addr, mod->module_core, mod->core_text_size))
2835 EXPORT_SYMBOL_GPL(__module_text_address);
2837 /* Don't grab lock, we're oopsing. */
2838 void print_modules(void)
2843 printk("Modules linked in:");
2844 /* Most callers should already have preempt disabled, but make sure */
2846 list_for_each_entry_rcu(mod, &modules, list)
2847 printk(" %s%s", mod->name, module_flags(mod, buf));
2849 if (last_unloaded_module[0])
2850 printk(" [last unloaded: %s]", last_unloaded_module);
2854 #ifdef CONFIG_MODVERSIONS
2855 /* Generate the signature for all relevant module structures here.
2856 * If these change, we don't want to try to parse the module. */
2857 void module_layout(struct module *mod,
2858 struct modversion_info *ver,
2859 struct kernel_param *kp,
2860 struct kernel_symbol *ks,
2861 struct marker *marker,
2862 struct tracepoint *tp)
2865 EXPORT_SYMBOL(module_layout);
2868 #ifdef CONFIG_MARKERS
2869 void module_update_markers(void)
2873 mutex_lock(&module_mutex);
2874 list_for_each_entry(mod, &modules, list)
2876 marker_update_probe_range(mod->markers,
2877 mod->markers + mod->num_markers);
2878 mutex_unlock(&module_mutex);
2882 #ifdef CONFIG_TRACEPOINTS
2883 void module_update_tracepoints(void)
2887 mutex_lock(&module_mutex);
2888 list_for_each_entry(mod, &modules, list)
2890 tracepoint_update_probe_range(mod->tracepoints,
2891 mod->tracepoints + mod->num_tracepoints);
2892 mutex_unlock(&module_mutex);
2896 * Returns 0 if current not found.
2897 * Returns 1 if current found.
2899 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2901 struct module *iter_mod;
2904 mutex_lock(&module_mutex);
2905 list_for_each_entry(iter_mod, &modules, list) {
2906 if (!iter_mod->taints) {
2908 * Sorted module list
2910 if (iter_mod < iter->module)
2912 else if (iter_mod > iter->module)
2913 iter->tracepoint = NULL;
2914 found = tracepoint_get_iter_range(&iter->tracepoint,
2915 iter_mod->tracepoints,
2916 iter_mod->tracepoints
2917 + iter_mod->num_tracepoints);
2919 iter->module = iter_mod;
2924 mutex_unlock(&module_mutex);