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>
58 #define DEBUGP(fmt , a...)
61 #ifndef ARCH_SHF_SMALL
62 #define ARCH_SHF_SMALL 0
65 /* If this is set, the section belongs in the init part of the module */
66 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
68 /* List of modules, protected by module_mutex or preempt_disable
69 * (delete uses stop_machine/add uses RCU list operations). */
70 static DEFINE_MUTEX(module_mutex);
71 static LIST_HEAD(modules);
73 /* Waiting for a module to finish initializing? */
74 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
76 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
78 /* Bounds of module allocation, for speeding __module_text_address */
79 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
81 int register_module_notifier(struct notifier_block * nb)
83 return blocking_notifier_chain_register(&module_notify_list, nb);
85 EXPORT_SYMBOL(register_module_notifier);
87 int unregister_module_notifier(struct notifier_block * nb)
89 return blocking_notifier_chain_unregister(&module_notify_list, nb);
91 EXPORT_SYMBOL(unregister_module_notifier);
93 /* We require a truly strong try_module_get(): 0 means failure due to
94 ongoing or failed initialization etc. */
95 static inline int strong_try_module_get(struct module *mod)
97 if (mod && mod->state == MODULE_STATE_COMING)
99 if (try_module_get(mod))
105 static inline void add_taint_module(struct module *mod, unsigned flag)
108 mod->taints |= (1U << flag);
112 * A thread that wants to hold a reference to a module only while it
113 * is running can call this to safely exit. nfsd and lockd use this.
115 void __module_put_and_exit(struct module *mod, long code)
120 EXPORT_SYMBOL(__module_put_and_exit);
122 /* Find a module section: 0 means not found. */
123 static unsigned int find_sec(Elf_Ehdr *hdr,
125 const char *secstrings,
130 for (i = 1; i < hdr->e_shnum; i++)
131 /* Alloc bit cleared means "ignore it." */
132 if ((sechdrs[i].sh_flags & SHF_ALLOC)
133 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
138 /* Find a module section, or NULL. */
139 static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
140 const char *secstrings, const char *name)
142 /* Section 0 has sh_addr 0. */
143 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
146 /* Find a module section, or NULL. Fill in number of "objects" in section. */
147 static void *section_objs(Elf_Ehdr *hdr,
149 const char *secstrings,
154 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
156 /* Section 0 has sh_addr 0 and sh_size 0. */
157 *num = sechdrs[sec].sh_size / object_size;
158 return (void *)sechdrs[sec].sh_addr;
161 /* Provided by the linker */
162 extern const struct kernel_symbol __start___ksymtab[];
163 extern const struct kernel_symbol __stop___ksymtab[];
164 extern const struct kernel_symbol __start___ksymtab_gpl[];
165 extern const struct kernel_symbol __stop___ksymtab_gpl[];
166 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
167 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
168 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
169 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
170 extern const unsigned long __start___kcrctab[];
171 extern const unsigned long __start___kcrctab_gpl[];
172 extern const unsigned long __start___kcrctab_gpl_future[];
173 #ifdef CONFIG_UNUSED_SYMBOLS
174 extern const struct kernel_symbol __start___ksymtab_unused[];
175 extern const struct kernel_symbol __stop___ksymtab_unused[];
176 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
177 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
178 extern const unsigned long __start___kcrctab_unused[];
179 extern const unsigned long __start___kcrctab_unused_gpl[];
182 #ifndef CONFIG_MODVERSIONS
183 #define symversion(base, idx) NULL
185 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
189 const struct kernel_symbol *start, *stop;
190 const unsigned long *crcs;
199 static bool each_symbol_in_section(const struct symsearch *arr,
200 unsigned int arrsize,
201 struct module *owner,
202 bool (*fn)(const struct symsearch *syms,
203 struct module *owner,
204 unsigned int symnum, void *data),
209 for (j = 0; j < arrsize; j++) {
210 for (i = 0; i < arr[j].stop - arr[j].start; i++)
211 if (fn(&arr[j], owner, i, data))
218 /* Returns true as soon as fn returns true, otherwise false. */
219 static bool each_symbol(bool (*fn)(const struct symsearch *arr,
220 struct module *owner,
221 unsigned int symnum, 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))
276 struct find_symbol_arg {
283 struct module *owner;
284 const unsigned long *crc;
288 static bool find_symbol_in_section(const struct symsearch *syms,
289 struct module *owner,
290 unsigned int symnum, void *data)
292 struct find_symbol_arg *fsa = data;
294 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
298 if (syms->licence == GPL_ONLY)
300 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
301 printk(KERN_WARNING "Symbol %s is being used "
302 "by a non-GPL module, which will not "
303 "be allowed in the future\n", fsa->name);
304 printk(KERN_WARNING "Please see the file "
305 "Documentation/feature-removal-schedule.txt "
306 "in the kernel source tree for more details.\n");
310 #ifdef CONFIG_UNUSED_SYMBOLS
311 if (syms->unused && fsa->warn) {
312 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
313 "however this module is using it.\n", fsa->name);
315 "This symbol will go away in the future.\n");
317 "Please evalute if this is the right api to use and if "
318 "it really is, submit a report the linux kernel "
319 "mailinglist together with submitting your code for "
325 fsa->crc = symversion(syms->crcs, symnum);
326 fsa->value = syms->start[symnum].value;
330 /* Find a symbol, return value, (optional) crc and (optional) module
332 static unsigned long find_symbol(const char *name,
333 struct module **owner,
334 const unsigned long **crc,
338 struct find_symbol_arg fsa;
344 if (each_symbol(find_symbol_in_section, &fsa)) {
352 DEBUGP("Failed to find symbol %s\n", name);
356 /* Search for module by name: must hold module_mutex. */
357 static struct module *find_module(const char *name)
361 list_for_each_entry(mod, &modules, list) {
362 if (strcmp(mod->name, name) == 0)
369 /* Number of blocks used and allocated. */
370 static unsigned int pcpu_num_used, pcpu_num_allocated;
371 /* Size of each block. -ve means used. */
372 static int *pcpu_size;
374 static int split_block(unsigned int i, unsigned short size)
376 /* Reallocation required? */
377 if (pcpu_num_used + 1 > pcpu_num_allocated) {
380 new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
385 pcpu_num_allocated *= 2;
389 /* Insert a new subblock */
390 memmove(&pcpu_size[i+1], &pcpu_size[i],
391 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
394 pcpu_size[i+1] -= size;
399 static inline unsigned int block_size(int val)
406 static void *percpu_modalloc(unsigned long size, unsigned long align,
413 if (align > PAGE_SIZE) {
414 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
415 name, align, PAGE_SIZE);
419 ptr = __per_cpu_start;
420 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
421 /* Extra for alignment requirement. */
422 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
423 BUG_ON(i == 0 && extra != 0);
425 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
428 /* Transfer extra to previous block. */
429 if (pcpu_size[i-1] < 0)
430 pcpu_size[i-1] -= extra;
432 pcpu_size[i-1] += extra;
433 pcpu_size[i] -= extra;
436 /* Split block if warranted */
437 if (pcpu_size[i] - size > sizeof(unsigned long))
438 if (!split_block(i, size))
442 pcpu_size[i] = -pcpu_size[i];
446 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
451 static void percpu_modfree(void *freeme)
454 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
456 /* First entry is core kernel percpu data. */
457 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
459 pcpu_size[i] = -pcpu_size[i];
466 /* Merge with previous? */
467 if (pcpu_size[i-1] >= 0) {
468 pcpu_size[i-1] += pcpu_size[i];
470 memmove(&pcpu_size[i], &pcpu_size[i+1],
471 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
474 /* Merge with next? */
475 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
476 pcpu_size[i] += pcpu_size[i+1];
478 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
479 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
483 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
485 const char *secstrings)
487 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
490 static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
494 for_each_possible_cpu(cpu)
495 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
498 static int percpu_modinit(void)
501 pcpu_num_allocated = 2;
502 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
504 /* Static in-kernel percpu data (used). */
505 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
507 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
508 if (pcpu_size[1] < 0) {
509 printk(KERN_ERR "No per-cpu room for modules.\n");
515 __initcall(percpu_modinit);
516 #else /* ... !CONFIG_SMP */
517 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
522 static inline void percpu_modfree(void *pcpuptr)
526 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
528 const char *secstrings)
532 static inline void percpu_modcopy(void *pcpudst, const void *src,
535 /* pcpusec should be 0, and size of that section should be 0. */
538 #endif /* CONFIG_SMP */
540 #define MODINFO_ATTR(field) \
541 static void setup_modinfo_##field(struct module *mod, const char *s) \
543 mod->field = kstrdup(s, GFP_KERNEL); \
545 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
546 struct module *mod, char *buffer) \
548 return sprintf(buffer, "%s\n", mod->field); \
550 static int modinfo_##field##_exists(struct module *mod) \
552 return mod->field != NULL; \
554 static void free_modinfo_##field(struct module *mod) \
559 static struct module_attribute modinfo_##field = { \
560 .attr = { .name = __stringify(field), .mode = 0444 }, \
561 .show = show_modinfo_##field, \
562 .setup = setup_modinfo_##field, \
563 .test = modinfo_##field##_exists, \
564 .free = free_modinfo_##field, \
567 MODINFO_ATTR(version);
568 MODINFO_ATTR(srcversion);
570 static char last_unloaded_module[MODULE_NAME_LEN+1];
572 #ifdef CONFIG_MODULE_UNLOAD
573 /* Init the unload section of the module. */
574 static void module_unload_init(struct module *mod)
578 INIT_LIST_HEAD(&mod->modules_which_use_me);
579 for (i = 0; i < NR_CPUS; i++)
580 local_set(&mod->ref[i].count, 0);
581 /* Hold reference count during initialization. */
582 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
583 /* Backwards compatibility macros put refcount during init. */
584 mod->waiter = current;
587 /* modules using other modules */
590 struct list_head list;
591 struct module *module_which_uses;
594 /* Does a already use b? */
595 static int already_uses(struct module *a, struct module *b)
597 struct module_use *use;
599 list_for_each_entry(use, &b->modules_which_use_me, list) {
600 if (use->module_which_uses == a) {
601 DEBUGP("%s uses %s!\n", a->name, b->name);
605 DEBUGP("%s does not use %s!\n", a->name, b->name);
609 /* Module a uses b */
610 static int use_module(struct module *a, struct module *b)
612 struct module_use *use;
615 if (b == NULL || already_uses(a, b)) return 1;
617 /* If we're interrupted or time out, we fail. */
618 if (wait_event_interruptible_timeout(
619 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
621 printk("%s: gave up waiting for init of module %s.\n",
626 /* If strong_try_module_get() returned a different error, we fail. */
630 DEBUGP("Allocating new usage for %s.\n", a->name);
631 use = kmalloc(sizeof(*use), GFP_ATOMIC);
633 printk("%s: out of memory loading\n", a->name);
638 use->module_which_uses = a;
639 list_add(&use->list, &b->modules_which_use_me);
640 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
644 /* Clear the unload stuff of the module. */
645 static void module_unload_free(struct module *mod)
649 list_for_each_entry(i, &modules, list) {
650 struct module_use *use;
652 list_for_each_entry(use, &i->modules_which_use_me, list) {
653 if (use->module_which_uses == mod) {
654 DEBUGP("%s unusing %s\n", mod->name, i->name);
656 list_del(&use->list);
658 sysfs_remove_link(i->holders_dir, mod->name);
659 /* There can be at most one match. */
666 #ifdef CONFIG_MODULE_FORCE_UNLOAD
667 static inline int try_force_unload(unsigned int flags)
669 int ret = (flags & O_TRUNC);
671 add_taint(TAINT_FORCED_RMMOD);
675 static inline int try_force_unload(unsigned int flags)
679 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
688 /* Whole machine is stopped with interrupts off when this runs. */
689 static int __try_stop_module(void *_sref)
691 struct stopref *sref = _sref;
693 /* If it's not unused, quit unless we're forcing. */
694 if (module_refcount(sref->mod) != 0) {
695 if (!(*sref->forced = try_force_unload(sref->flags)))
699 /* Mark it as dying. */
700 sref->mod->state = MODULE_STATE_GOING;
704 static int try_stop_module(struct module *mod, int flags, int *forced)
706 if (flags & O_NONBLOCK) {
707 struct stopref sref = { mod, flags, forced };
709 return stop_machine(__try_stop_module, &sref, NULL);
711 /* We don't need to stop the machine for this. */
712 mod->state = MODULE_STATE_GOING;
718 unsigned int module_refcount(struct module *mod)
720 unsigned int i, total = 0;
722 for (i = 0; i < NR_CPUS; i++)
723 total += local_read(&mod->ref[i].count);
726 EXPORT_SYMBOL(module_refcount);
728 /* This exists whether we can unload or not */
729 static void free_module(struct module *mod);
731 static void wait_for_zero_refcount(struct module *mod)
733 /* Since we might sleep for some time, release the mutex first */
734 mutex_unlock(&module_mutex);
736 DEBUGP("Looking at refcount...\n");
737 set_current_state(TASK_UNINTERRUPTIBLE);
738 if (module_refcount(mod) == 0)
742 current->state = TASK_RUNNING;
743 mutex_lock(&module_mutex);
747 sys_delete_module(const char __user *name_user, unsigned int flags)
750 char name[MODULE_NAME_LEN];
753 if (!capable(CAP_SYS_MODULE))
756 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
758 name[MODULE_NAME_LEN-1] = '\0';
760 /* Create stop_machine threads since free_module relies on
761 * a non-failing stop_machine call. */
762 ret = stop_machine_create();
766 if (mutex_lock_interruptible(&module_mutex) != 0) {
771 mod = find_module(name);
777 if (!list_empty(&mod->modules_which_use_me)) {
778 /* Other modules depend on us: get rid of them first. */
783 /* Doing init or already dying? */
784 if (mod->state != MODULE_STATE_LIVE) {
785 /* FIXME: if (force), slam module count and wake up
787 DEBUGP("%s already dying\n", mod->name);
792 /* If it has an init func, it must have an exit func to unload */
793 if (mod->init && !mod->exit) {
794 forced = try_force_unload(flags);
796 /* This module can't be removed */
802 /* Set this up before setting mod->state */
803 mod->waiter = current;
805 /* Stop the machine so refcounts can't move and disable module. */
806 ret = try_stop_module(mod, flags, &forced);
810 /* Never wait if forced. */
811 if (!forced && module_refcount(mod) != 0)
812 wait_for_zero_refcount(mod);
814 mutex_unlock(&module_mutex);
815 /* Final destruction now noone is using it. */
816 if (mod->exit != NULL)
818 blocking_notifier_call_chain(&module_notify_list,
819 MODULE_STATE_GOING, mod);
820 async_synchronize_full();
821 mutex_lock(&module_mutex);
822 /* Store the name of the last unloaded module for diagnostic purposes */
823 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
824 unregister_dynamic_debug_module(mod->name);
828 mutex_unlock(&module_mutex);
830 stop_machine_destroy();
834 static inline void print_unload_info(struct seq_file *m, struct module *mod)
836 struct module_use *use;
837 int printed_something = 0;
839 seq_printf(m, " %u ", module_refcount(mod));
841 /* Always include a trailing , so userspace can differentiate
842 between this and the old multi-field proc format. */
843 list_for_each_entry(use, &mod->modules_which_use_me, list) {
844 printed_something = 1;
845 seq_printf(m, "%s,", use->module_which_uses->name);
848 if (mod->init != NULL && mod->exit == NULL) {
849 printed_something = 1;
850 seq_printf(m, "[permanent],");
853 if (!printed_something)
857 void __symbol_put(const char *symbol)
859 struct module *owner;
862 if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false)))
867 EXPORT_SYMBOL(__symbol_put);
869 void symbol_put_addr(void *addr)
871 struct module *modaddr;
873 if (core_kernel_text((unsigned long)addr))
876 if (!(modaddr = module_text_address((unsigned long)addr)))
880 EXPORT_SYMBOL_GPL(symbol_put_addr);
882 static ssize_t show_refcnt(struct module_attribute *mattr,
883 struct module *mod, char *buffer)
885 return sprintf(buffer, "%u\n", module_refcount(mod));
888 static struct module_attribute refcnt = {
889 .attr = { .name = "refcnt", .mode = 0444 },
893 void module_put(struct module *module)
896 unsigned int cpu = get_cpu();
897 local_dec(&module->ref[cpu].count);
898 /* Maybe they're waiting for us to drop reference? */
899 if (unlikely(!module_is_live(module)))
900 wake_up_process(module->waiter);
904 EXPORT_SYMBOL(module_put);
906 #else /* !CONFIG_MODULE_UNLOAD */
907 static inline void print_unload_info(struct seq_file *m, struct module *mod)
909 /* We don't know the usage count, or what modules are using. */
910 seq_printf(m, " - -");
913 static inline void module_unload_free(struct module *mod)
917 static inline int use_module(struct module *a, struct module *b)
919 return strong_try_module_get(b) == 0;
922 static inline void module_unload_init(struct module *mod)
925 #endif /* CONFIG_MODULE_UNLOAD */
927 static ssize_t show_initstate(struct module_attribute *mattr,
928 struct module *mod, char *buffer)
930 const char *state = "unknown";
932 switch (mod->state) {
933 case MODULE_STATE_LIVE:
936 case MODULE_STATE_COMING:
939 case MODULE_STATE_GOING:
943 return sprintf(buffer, "%s\n", state);
946 static struct module_attribute initstate = {
947 .attr = { .name = "initstate", .mode = 0444 },
948 .show = show_initstate,
951 static struct module_attribute *modinfo_attrs[] = {
955 #ifdef CONFIG_MODULE_UNLOAD
961 static const char vermagic[] = VERMAGIC_STRING;
963 static int try_to_force_load(struct module *mod, const char *symname)
965 #ifdef CONFIG_MODULE_FORCE_LOAD
966 if (!test_taint(TAINT_FORCED_MODULE))
967 printk("%s: no version for \"%s\" found: kernel tainted.\n",
969 add_taint_module(mod, TAINT_FORCED_MODULE);
976 #ifdef CONFIG_MODVERSIONS
977 static int check_version(Elf_Shdr *sechdrs,
978 unsigned int versindex,
981 const unsigned long *crc)
983 unsigned int i, num_versions;
984 struct modversion_info *versions;
986 /* Exporting module didn't supply crcs? OK, we're already tainted. */
990 /* No versions at all? modprobe --force does this. */
992 return try_to_force_load(mod, symname) == 0;
994 versions = (void *) sechdrs[versindex].sh_addr;
995 num_versions = sechdrs[versindex].sh_size
996 / sizeof(struct modversion_info);
998 for (i = 0; i < num_versions; i++) {
999 if (strcmp(versions[i].name, symname) != 0)
1002 if (versions[i].crc == *crc)
1004 DEBUGP("Found checksum %lX vs module %lX\n",
1005 *crc, versions[i].crc);
1009 printk(KERN_WARNING "%s: no symbol version for %s\n",
1010 mod->name, symname);
1014 printk("%s: disagrees about version of symbol %s\n",
1015 mod->name, symname);
1019 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1020 unsigned int versindex,
1023 const unsigned long *crc;
1025 if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false)))
1027 return check_version(sechdrs, versindex, "struct_module", mod, crc);
1030 /* First part is kernel version, which we ignore if module has crcs. */
1031 static inline int same_magic(const char *amagic, const char *bmagic,
1035 amagic += strcspn(amagic, " ");
1036 bmagic += strcspn(bmagic, " ");
1038 return strcmp(amagic, bmagic) == 0;
1041 static inline int check_version(Elf_Shdr *sechdrs,
1042 unsigned int versindex,
1043 const char *symname,
1045 const unsigned long *crc)
1050 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1051 unsigned int versindex,
1057 static inline int same_magic(const char *amagic, const char *bmagic,
1060 return strcmp(amagic, bmagic) == 0;
1062 #endif /* CONFIG_MODVERSIONS */
1064 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1065 Must be holding module_mutex. */
1066 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
1067 unsigned int versindex,
1071 struct module *owner;
1073 const unsigned long *crc;
1075 ret = find_symbol(name, &owner, &crc,
1076 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1077 if (!IS_ERR_VALUE(ret)) {
1078 /* use_module can fail due to OOM,
1079 or module initialization or unloading */
1080 if (!check_version(sechdrs, versindex, name, mod, crc) ||
1081 !use_module(mod, owner))
1088 * /sys/module/foo/sections stuff
1089 * J. Corbet <corbet@lwn.net>
1091 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1092 struct module_sect_attr
1094 struct module_attribute mattr;
1096 unsigned long address;
1099 struct module_sect_attrs
1101 struct attribute_group grp;
1102 unsigned int nsections;
1103 struct module_sect_attr attrs[0];
1106 static ssize_t module_sect_show(struct module_attribute *mattr,
1107 struct module *mod, char *buf)
1109 struct module_sect_attr *sattr =
1110 container_of(mattr, struct module_sect_attr, mattr);
1111 return sprintf(buf, "0x%lx\n", sattr->address);
1114 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1116 unsigned int section;
1118 for (section = 0; section < sect_attrs->nsections; section++)
1119 kfree(sect_attrs->attrs[section].name);
1123 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1124 char *secstrings, Elf_Shdr *sechdrs)
1126 unsigned int nloaded = 0, i, size[2];
1127 struct module_sect_attrs *sect_attrs;
1128 struct module_sect_attr *sattr;
1129 struct attribute **gattr;
1131 /* Count loaded sections and allocate structures */
1132 for (i = 0; i < nsect; i++)
1133 if (sechdrs[i].sh_flags & SHF_ALLOC)
1135 size[0] = ALIGN(sizeof(*sect_attrs)
1136 + nloaded * sizeof(sect_attrs->attrs[0]),
1137 sizeof(sect_attrs->grp.attrs[0]));
1138 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1139 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1140 if (sect_attrs == NULL)
1143 /* Setup section attributes. */
1144 sect_attrs->grp.name = "sections";
1145 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1147 sect_attrs->nsections = 0;
1148 sattr = §_attrs->attrs[0];
1149 gattr = §_attrs->grp.attrs[0];
1150 for (i = 0; i < nsect; i++) {
1151 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1153 sattr->address = sechdrs[i].sh_addr;
1154 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1156 if (sattr->name == NULL)
1158 sect_attrs->nsections++;
1159 sattr->mattr.show = module_sect_show;
1160 sattr->mattr.store = NULL;
1161 sattr->mattr.attr.name = sattr->name;
1162 sattr->mattr.attr.mode = S_IRUGO;
1163 *(gattr++) = &(sattr++)->mattr.attr;
1167 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1170 mod->sect_attrs = sect_attrs;
1173 free_sect_attrs(sect_attrs);
1176 static void remove_sect_attrs(struct module *mod)
1178 if (mod->sect_attrs) {
1179 sysfs_remove_group(&mod->mkobj.kobj,
1180 &mod->sect_attrs->grp);
1181 /* We are positive that no one is using any sect attrs
1182 * at this point. Deallocate immediately. */
1183 free_sect_attrs(mod->sect_attrs);
1184 mod->sect_attrs = NULL;
1189 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1192 struct module_notes_attrs {
1193 struct kobject *dir;
1195 struct bin_attribute attrs[0];
1198 static ssize_t module_notes_read(struct kobject *kobj,
1199 struct bin_attribute *bin_attr,
1200 char *buf, loff_t pos, size_t count)
1203 * The caller checked the pos and count against our size.
1205 memcpy(buf, bin_attr->private + pos, count);
1209 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1212 if (notes_attrs->dir) {
1214 sysfs_remove_bin_file(notes_attrs->dir,
1215 ¬es_attrs->attrs[i]);
1216 kobject_put(notes_attrs->dir);
1221 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1222 char *secstrings, Elf_Shdr *sechdrs)
1224 unsigned int notes, loaded, i;
1225 struct module_notes_attrs *notes_attrs;
1226 struct bin_attribute *nattr;
1228 /* Count notes sections and allocate structures. */
1230 for (i = 0; i < nsect; i++)
1231 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1232 (sechdrs[i].sh_type == SHT_NOTE))
1238 notes_attrs = kzalloc(sizeof(*notes_attrs)
1239 + notes * sizeof(notes_attrs->attrs[0]),
1241 if (notes_attrs == NULL)
1244 notes_attrs->notes = notes;
1245 nattr = ¬es_attrs->attrs[0];
1246 for (loaded = i = 0; i < nsect; ++i) {
1247 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1249 if (sechdrs[i].sh_type == SHT_NOTE) {
1250 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1251 nattr->attr.mode = S_IRUGO;
1252 nattr->size = sechdrs[i].sh_size;
1253 nattr->private = (void *) sechdrs[i].sh_addr;
1254 nattr->read = module_notes_read;
1260 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1261 if (!notes_attrs->dir)
1264 for (i = 0; i < notes; ++i)
1265 if (sysfs_create_bin_file(notes_attrs->dir,
1266 ¬es_attrs->attrs[i]))
1269 mod->notes_attrs = notes_attrs;
1273 free_notes_attrs(notes_attrs, i);
1276 static void remove_notes_attrs(struct module *mod)
1278 if (mod->notes_attrs)
1279 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1284 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1285 char *sectstrings, Elf_Shdr *sechdrs)
1289 static inline void remove_sect_attrs(struct module *mod)
1293 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1294 char *sectstrings, Elf_Shdr *sechdrs)
1298 static inline void remove_notes_attrs(struct module *mod)
1304 int module_add_modinfo_attrs(struct module *mod)
1306 struct module_attribute *attr;
1307 struct module_attribute *temp_attr;
1311 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1312 (ARRAY_SIZE(modinfo_attrs) + 1)),
1314 if (!mod->modinfo_attrs)
1317 temp_attr = mod->modinfo_attrs;
1318 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1320 (attr->test && attr->test(mod))) {
1321 memcpy(temp_attr, attr, sizeof(*temp_attr));
1322 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1329 void module_remove_modinfo_attrs(struct module *mod)
1331 struct module_attribute *attr;
1334 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1335 /* pick a field to test for end of list */
1336 if (!attr->attr.name)
1338 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1342 kfree(mod->modinfo_attrs);
1345 int mod_sysfs_init(struct module *mod)
1348 struct kobject *kobj;
1350 if (!module_sysfs_initialized) {
1351 printk(KERN_ERR "%s: module sysfs not initialized\n",
1357 kobj = kset_find_obj(module_kset, mod->name);
1359 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1365 mod->mkobj.mod = mod;
1367 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1368 mod->mkobj.kobj.kset = module_kset;
1369 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1372 kobject_put(&mod->mkobj.kobj);
1374 /* delay uevent until full sysfs population */
1379 int mod_sysfs_setup(struct module *mod,
1380 struct kernel_param *kparam,
1381 unsigned int num_params)
1385 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1386 if (!mod->holders_dir) {
1391 err = module_param_sysfs_setup(mod, kparam, num_params);
1393 goto out_unreg_holders;
1395 err = module_add_modinfo_attrs(mod);
1397 goto out_unreg_param;
1399 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1403 module_param_sysfs_remove(mod);
1405 kobject_put(mod->holders_dir);
1407 kobject_put(&mod->mkobj.kobj);
1411 static void mod_sysfs_fini(struct module *mod)
1413 kobject_put(&mod->mkobj.kobj);
1416 #else /* CONFIG_SYSFS */
1418 static void mod_sysfs_fini(struct module *mod)
1422 #endif /* CONFIG_SYSFS */
1424 static void mod_kobject_remove(struct module *mod)
1426 module_remove_modinfo_attrs(mod);
1427 module_param_sysfs_remove(mod);
1428 kobject_put(mod->mkobj.drivers_dir);
1429 kobject_put(mod->holders_dir);
1430 mod_sysfs_fini(mod);
1434 * unlink the module with the whole machine is stopped with interrupts off
1435 * - this defends against kallsyms not taking locks
1437 static int __unlink_module(void *_mod)
1439 struct module *mod = _mod;
1440 list_del(&mod->list);
1444 /* Free a module, remove from lists, etc (must hold module_mutex). */
1445 static void free_module(struct module *mod)
1447 /* Delete from various lists */
1448 stop_machine(__unlink_module, mod, NULL);
1449 remove_notes_attrs(mod);
1450 remove_sect_attrs(mod);
1451 mod_kobject_remove(mod);
1453 /* Arch-specific cleanup. */
1454 module_arch_cleanup(mod);
1456 /* Module unload stuff */
1457 module_unload_free(mod);
1459 /* release any pointers to mcount in this module */
1460 ftrace_release(mod->module_core, mod->core_size);
1462 /* This may be NULL, but that's OK */
1463 module_free(mod, mod->module_init);
1466 percpu_modfree(mod->percpu);
1468 /* Free lock-classes: */
1469 lockdep_free_key_range(mod->module_core, mod->core_size);
1471 /* Finally, free the core (containing the module structure) */
1472 module_free(mod, mod->module_core);
1475 void *__symbol_get(const char *symbol)
1477 struct module *owner;
1478 unsigned long value;
1481 value = find_symbol(symbol, &owner, NULL, true, true);
1482 if (IS_ERR_VALUE(value))
1484 else if (strong_try_module_get(owner))
1488 return (void *)value;
1490 EXPORT_SYMBOL_GPL(__symbol_get);
1493 * Ensure that an exported symbol [global namespace] does not already exist
1494 * in the kernel or in some other module's exported symbol table.
1496 static int verify_export_symbols(struct module *mod)
1499 struct module *owner;
1500 const struct kernel_symbol *s;
1502 const struct kernel_symbol *sym;
1505 { mod->syms, mod->num_syms },
1506 { mod->gpl_syms, mod->num_gpl_syms },
1507 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1508 #ifdef CONFIG_UNUSED_SYMBOLS
1509 { mod->unused_syms, mod->num_unused_syms },
1510 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1514 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1515 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1516 if (!IS_ERR_VALUE(find_symbol(s->name, &owner,
1517 NULL, true, false))) {
1519 "%s: exports duplicate symbol %s"
1521 mod->name, s->name, module_name(owner));
1529 /* Change all symbols so that st_value encodes the pointer directly. */
1530 static int simplify_symbols(Elf_Shdr *sechdrs,
1531 unsigned int symindex,
1533 unsigned int versindex,
1534 unsigned int pcpuindex,
1537 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1538 unsigned long secbase;
1539 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1542 for (i = 1; i < n; i++) {
1543 switch (sym[i].st_shndx) {
1545 /* We compiled with -fno-common. These are not
1546 supposed to happen. */
1547 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1548 printk("%s: please compile with -fno-common\n",
1554 /* Don't need to do anything */
1555 DEBUGP("Absolute symbol: 0x%08lx\n",
1556 (long)sym[i].st_value);
1561 = resolve_symbol(sechdrs, versindex,
1562 strtab + sym[i].st_name, mod);
1564 /* Ok if resolved. */
1565 if (!IS_ERR_VALUE(sym[i].st_value))
1568 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1571 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1572 mod->name, strtab + sym[i].st_name);
1577 /* Divert to percpu allocation if a percpu var. */
1578 if (sym[i].st_shndx == pcpuindex)
1579 secbase = (unsigned long)mod->percpu;
1581 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1582 sym[i].st_value += secbase;
1590 /* Additional bytes needed by arch in front of individual sections */
1591 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1592 unsigned int section)
1594 /* default implementation just returns zero */
1598 /* Update size with this section: return offset. */
1599 static long get_offset(struct module *mod, unsigned int *size,
1600 Elf_Shdr *sechdr, unsigned int section)
1604 *size += arch_mod_section_prepend(mod, section);
1605 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1606 *size = ret + sechdr->sh_size;
1610 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1611 might -- code, read-only data, read-write data, small data. Tally
1612 sizes, and place the offsets into sh_entsize fields: high bit means it
1614 static void layout_sections(struct module *mod,
1615 const Elf_Ehdr *hdr,
1617 const char *secstrings)
1619 static unsigned long const masks[][2] = {
1620 /* NOTE: all executable code must be the first section
1621 * in this array; otherwise modify the text_size
1622 * finder in the two loops below */
1623 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1624 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1625 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1626 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1630 for (i = 0; i < hdr->e_shnum; i++)
1631 sechdrs[i].sh_entsize = ~0UL;
1633 DEBUGP("Core section allocation order:\n");
1634 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1635 for (i = 0; i < hdr->e_shnum; ++i) {
1636 Elf_Shdr *s = &sechdrs[i];
1638 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1639 || (s->sh_flags & masks[m][1])
1640 || s->sh_entsize != ~0UL
1641 || strncmp(secstrings + s->sh_name,
1644 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1645 DEBUGP("\t%s\n", secstrings + s->sh_name);
1648 mod->core_text_size = mod->core_size;
1651 DEBUGP("Init section allocation order:\n");
1652 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1653 for (i = 0; i < hdr->e_shnum; ++i) {
1654 Elf_Shdr *s = &sechdrs[i];
1656 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1657 || (s->sh_flags & masks[m][1])
1658 || s->sh_entsize != ~0UL
1659 || strncmp(secstrings + s->sh_name,
1662 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1663 | INIT_OFFSET_MASK);
1664 DEBUGP("\t%s\n", secstrings + s->sh_name);
1667 mod->init_text_size = mod->init_size;
1671 static void set_license(struct module *mod, const char *license)
1674 license = "unspecified";
1676 if (!license_is_gpl_compatible(license)) {
1677 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1678 printk(KERN_WARNING "%s: module license '%s' taints "
1679 "kernel.\n", mod->name, license);
1680 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1684 /* Parse tag=value strings from .modinfo section */
1685 static char *next_string(char *string, unsigned long *secsize)
1687 /* Skip non-zero chars */
1690 if ((*secsize)-- <= 1)
1694 /* Skip any zero padding. */
1695 while (!string[0]) {
1697 if ((*secsize)-- <= 1)
1703 static char *get_modinfo(Elf_Shdr *sechdrs,
1708 unsigned int taglen = strlen(tag);
1709 unsigned long size = sechdrs[info].sh_size;
1711 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1712 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1713 return p + taglen + 1;
1718 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1719 unsigned int infoindex)
1721 struct module_attribute *attr;
1724 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1727 get_modinfo(sechdrs,
1733 #ifdef CONFIG_KALLSYMS
1735 /* lookup symbol in given range of kernel_symbols */
1736 static const struct kernel_symbol *lookup_symbol(const char *name,
1737 const struct kernel_symbol *start,
1738 const struct kernel_symbol *stop)
1740 const struct kernel_symbol *ks = start;
1741 for (; ks < stop; ks++)
1742 if (strcmp(ks->name, name) == 0)
1747 static int is_exported(const char *name, unsigned long value,
1748 const struct module *mod)
1750 const struct kernel_symbol *ks;
1752 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1754 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1755 return ks != NULL && ks->value == value;
1759 static char elf_type(const Elf_Sym *sym,
1761 const char *secstrings,
1764 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1765 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1770 if (sym->st_shndx == SHN_UNDEF)
1772 if (sym->st_shndx == SHN_ABS)
1774 if (sym->st_shndx >= SHN_LORESERVE)
1776 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1778 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1779 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1780 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1782 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1787 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1788 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1793 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1794 ".debug", strlen(".debug")) == 0)
1799 static void add_kallsyms(struct module *mod,
1801 unsigned int symindex,
1802 unsigned int strindex,
1803 const char *secstrings)
1807 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1808 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1809 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1811 /* Set types up while we still have access to sections. */
1812 for (i = 0; i < mod->num_symtab; i++)
1813 mod->symtab[i].st_info
1814 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1817 static inline void add_kallsyms(struct module *mod,
1819 unsigned int symindex,
1820 unsigned int strindex,
1821 const char *secstrings)
1824 #endif /* CONFIG_KALLSYMS */
1826 static void dynamic_printk_setup(struct mod_debug *debug, unsigned int num)
1828 #ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
1831 for (i = 0; i < num; i++) {
1832 register_dynamic_debug_module(debug[i].modname,
1834 debug[i].logical_modname,
1835 debug[i].flag_names,
1836 debug[i].hash, debug[i].hash2);
1838 #endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
1841 static void *module_alloc_update_bounds(unsigned long size)
1843 void *ret = module_alloc(size);
1846 /* Update module bounds. */
1847 if ((unsigned long)ret < module_addr_min)
1848 module_addr_min = (unsigned long)ret;
1849 if ((unsigned long)ret + size > module_addr_max)
1850 module_addr_max = (unsigned long)ret + size;
1855 /* Allocate and load the module: note that size of section 0 is always
1856 zero, and we rely on this for optional sections. */
1857 static noinline struct module *load_module(void __user *umod,
1859 const char __user *uargs)
1863 char *secstrings, *args, *modmagic, *strtab = NULL;
1866 unsigned int symindex = 0;
1867 unsigned int strindex = 0;
1868 unsigned int modindex, versindex, infoindex, pcpuindex;
1869 unsigned int num_kp, num_mcount;
1870 struct kernel_param *kp;
1873 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1874 unsigned long *mseg;
1875 mm_segment_t old_fs;
1877 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1879 if (len < sizeof(*hdr))
1880 return ERR_PTR(-ENOEXEC);
1882 /* Suck in entire file: we'll want most of it. */
1883 /* vmalloc barfs on "unusual" numbers. Check here */
1884 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1885 return ERR_PTR(-ENOMEM);
1887 /* Create stop_machine threads since the error path relies on
1888 * a non-failing stop_machine call. */
1889 err = stop_machine_create();
1893 if (copy_from_user(hdr, umod, len) != 0) {
1898 /* Sanity checks against insmoding binaries or wrong arch,
1899 weird elf version */
1900 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1901 || hdr->e_type != ET_REL
1902 || !elf_check_arch(hdr)
1903 || hdr->e_shentsize != sizeof(*sechdrs)) {
1908 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1911 /* Convenience variables */
1912 sechdrs = (void *)hdr + hdr->e_shoff;
1913 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1914 sechdrs[0].sh_addr = 0;
1916 for (i = 1; i < hdr->e_shnum; i++) {
1917 if (sechdrs[i].sh_type != SHT_NOBITS
1918 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1921 /* Mark all sections sh_addr with their address in the
1923 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1925 /* Internal symbols and strings. */
1926 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1928 strindex = sechdrs[i].sh_link;
1929 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1931 #ifndef CONFIG_MODULE_UNLOAD
1932 /* Don't load .exit sections */
1933 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1934 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1938 modindex = find_sec(hdr, sechdrs, secstrings,
1939 ".gnu.linkonce.this_module");
1941 printk(KERN_WARNING "No module found in object\n");
1945 /* This is temporary: point mod into copy of data. */
1946 mod = (void *)sechdrs[modindex].sh_addr;
1948 if (symindex == 0) {
1949 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1955 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1956 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1957 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1959 /* Don't keep modinfo and version sections. */
1960 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1961 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1962 #ifdef CONFIG_KALLSYMS
1963 /* Keep symbol and string tables for decoding later. */
1964 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1965 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1968 /* Check module struct version now, before we try to use module. */
1969 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1974 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1975 /* This is allowed: modprobe --force will invalidate it. */
1977 err = try_to_force_load(mod, "magic");
1980 } else if (!same_magic(modmagic, vermagic, versindex)) {
1981 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1982 mod->name, modmagic, vermagic);
1987 staging = get_modinfo(sechdrs, infoindex, "staging");
1989 add_taint_module(mod, TAINT_CRAP);
1990 printk(KERN_WARNING "%s: module is from the staging directory,"
1991 " the quality is unknown, you have been warned.\n",
1995 /* Now copy in args */
1996 args = strndup_user(uargs, ~0UL >> 1);
1998 err = PTR_ERR(args);
2002 if (find_module(mod->name)) {
2007 mod->state = MODULE_STATE_COMING;
2009 /* Allow arches to frob section contents and sizes. */
2010 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2015 /* We have a special allocation for this section. */
2016 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2017 sechdrs[pcpuindex].sh_addralign,
2023 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2024 mod->percpu = percpu;
2027 /* Determine total sizes, and put offsets in sh_entsize. For now
2028 this is done generically; there doesn't appear to be any
2029 special cases for the architectures. */
2030 layout_sections(mod, hdr, sechdrs, secstrings);
2032 /* Do the allocs. */
2033 ptr = module_alloc_update_bounds(mod->core_size);
2038 memset(ptr, 0, mod->core_size);
2039 mod->module_core = ptr;
2041 ptr = module_alloc_update_bounds(mod->init_size);
2042 if (!ptr && mod->init_size) {
2046 memset(ptr, 0, mod->init_size);
2047 mod->module_init = ptr;
2049 /* Transfer each section which specifies SHF_ALLOC */
2050 DEBUGP("final section addresses:\n");
2051 for (i = 0; i < hdr->e_shnum; i++) {
2054 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2057 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2058 dest = mod->module_init
2059 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2061 dest = mod->module_core + sechdrs[i].sh_entsize;
2063 if (sechdrs[i].sh_type != SHT_NOBITS)
2064 memcpy(dest, (void *)sechdrs[i].sh_addr,
2065 sechdrs[i].sh_size);
2066 /* Update sh_addr to point to copy in image. */
2067 sechdrs[i].sh_addr = (unsigned long)dest;
2068 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2070 /* Module has been moved. */
2071 mod = (void *)sechdrs[modindex].sh_addr;
2073 /* Now we've moved module, initialize linked lists, etc. */
2074 module_unload_init(mod);
2076 /* add kobject, so we can reference it. */
2077 err = mod_sysfs_init(mod);
2081 /* Set up license info based on the info section */
2082 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2085 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2086 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2087 * using GPL-only symbols it needs.
2089 if (strcmp(mod->name, "ndiswrapper") == 0)
2090 add_taint(TAINT_PROPRIETARY_MODULE);
2092 /* driverloader was caught wrongly pretending to be under GPL */
2093 if (strcmp(mod->name, "driverloader") == 0)
2094 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2096 /* Set up MODINFO_ATTR fields */
2097 setup_modinfo(mod, sechdrs, infoindex);
2099 /* Fix up syms, so that st_value is a pointer to location. */
2100 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2105 /* Now we've got everything in the final locations, we can
2106 * find optional sections. */
2107 kp = section_objs(hdr, sechdrs, secstrings, "__param", sizeof(*kp),
2109 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2110 sizeof(*mod->syms), &mod->num_syms);
2111 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2112 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2113 sizeof(*mod->gpl_syms),
2114 &mod->num_gpl_syms);
2115 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2116 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2117 "__ksymtab_gpl_future",
2118 sizeof(*mod->gpl_future_syms),
2119 &mod->num_gpl_future_syms);
2120 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2121 "__kcrctab_gpl_future");
2123 #ifdef CONFIG_UNUSED_SYMBOLS
2124 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2126 sizeof(*mod->unused_syms),
2127 &mod->num_unused_syms);
2128 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2129 "__kcrctab_unused");
2130 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2131 "__ksymtab_unused_gpl",
2132 sizeof(*mod->unused_gpl_syms),
2133 &mod->num_unused_gpl_syms);
2134 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2135 "__kcrctab_unused_gpl");
2138 #ifdef CONFIG_MARKERS
2139 mod->markers = section_objs(hdr, sechdrs, secstrings, "__markers",
2140 sizeof(*mod->markers), &mod->num_markers);
2142 #ifdef CONFIG_TRACEPOINTS
2143 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2145 sizeof(*mod->tracepoints),
2146 &mod->num_tracepoints);
2149 #ifdef CONFIG_MODVERSIONS
2150 if ((mod->num_syms && !mod->crcs)
2151 || (mod->num_gpl_syms && !mod->gpl_crcs)
2152 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2153 #ifdef CONFIG_UNUSED_SYMBOLS
2154 || (mod->num_unused_syms && !mod->unused_crcs)
2155 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2158 printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name);
2159 err = try_to_force_load(mod, "nocrc");
2165 /* Now do relocations. */
2166 for (i = 1; i < hdr->e_shnum; i++) {
2167 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2168 unsigned int info = sechdrs[i].sh_info;
2170 /* Not a valid relocation section? */
2171 if (info >= hdr->e_shnum)
2174 /* Don't bother with non-allocated sections */
2175 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2178 if (sechdrs[i].sh_type == SHT_REL)
2179 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2180 else if (sechdrs[i].sh_type == SHT_RELA)
2181 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2187 /* Find duplicate symbols */
2188 err = verify_export_symbols(mod);
2192 /* Set up and sort exception table */
2193 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2194 sizeof(*mod->extable), &mod->num_exentries);
2195 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2197 /* Finally, copy percpu area over. */
2198 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2199 sechdrs[pcpuindex].sh_size);
2201 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
2204 struct mod_debug *debug;
2205 unsigned int num_debug;
2207 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2208 sizeof(*debug), &num_debug);
2209 dynamic_printk_setup(debug, num_debug);
2212 /* sechdrs[0].sh_size is always zero */
2213 mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc",
2214 sizeof(*mseg), &num_mcount);
2215 ftrace_init_module(mod, mseg, mseg + num_mcount);
2217 err = module_finalize(hdr, sechdrs, mod);
2221 /* flush the icache in correct context */
2226 * Flush the instruction cache, since we've played with text.
2227 * Do it before processing of module parameters, so the module
2228 * can provide parameter accessor functions of its own.
2230 if (mod->module_init)
2231 flush_icache_range((unsigned long)mod->module_init,
2232 (unsigned long)mod->module_init
2234 flush_icache_range((unsigned long)mod->module_core,
2235 (unsigned long)mod->module_core + mod->core_size);
2240 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2241 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2244 /* Now sew it into the lists so we can get lockdep and oops
2245 * info during argument parsing. Noone should access us, since
2246 * strong_try_module_get() will fail.
2247 * lockdep/oops can run asynchronous, so use the RCU list insertion
2248 * function to insert in a way safe to concurrent readers.
2249 * The mutex protects against concurrent writers.
2251 list_add_rcu(&mod->list, &modules);
2253 err = parse_args(mod->name, mod->args, kp, num_kp, NULL);
2257 err = mod_sysfs_setup(mod, kp, num_kp);
2260 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2261 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2263 /* Get rid of temporary copy */
2266 stop_machine_destroy();
2271 stop_machine(__unlink_module, mod, NULL);
2272 module_arch_cleanup(mod);
2274 kobject_del(&mod->mkobj.kobj);
2275 kobject_put(&mod->mkobj.kobj);
2276 ftrace_release(mod->module_core, mod->core_size);
2278 module_unload_free(mod);
2279 module_free(mod, mod->module_init);
2281 module_free(mod, mod->module_core);
2284 percpu_modfree(percpu);
2289 stop_machine_destroy();
2290 return ERR_PTR(err);
2293 printk(KERN_ERR "Module len %lu truncated\n", len);
2298 /* This is where the real work happens */
2300 sys_init_module(void __user *umod,
2302 const char __user *uargs)
2307 /* Must have permission */
2308 if (!capable(CAP_SYS_MODULE))
2311 /* Only one module load at a time, please */
2312 if (mutex_lock_interruptible(&module_mutex) != 0)
2315 /* Do all the hard work */
2316 mod = load_module(umod, len, uargs);
2318 mutex_unlock(&module_mutex);
2319 return PTR_ERR(mod);
2322 /* Drop lock so they can recurse */
2323 mutex_unlock(&module_mutex);
2325 blocking_notifier_call_chain(&module_notify_list,
2326 MODULE_STATE_COMING, mod);
2328 /* Start the module */
2329 if (mod->init != NULL)
2330 ret = do_one_initcall(mod->init);
2332 /* Init routine failed: abort. Try to protect us from
2333 buggy refcounters. */
2334 mod->state = MODULE_STATE_GOING;
2335 synchronize_sched();
2337 blocking_notifier_call_chain(&module_notify_list,
2338 MODULE_STATE_GOING, mod);
2339 mutex_lock(&module_mutex);
2341 mutex_unlock(&module_mutex);
2342 wake_up(&module_wq);
2346 printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, "
2347 "it should follow 0/-E convention\n"
2348 KERN_WARNING "%s: loading module anyway...\n",
2349 __func__, mod->name, ret,
2354 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2355 mod->state = MODULE_STATE_LIVE;
2356 wake_up(&module_wq);
2357 blocking_notifier_call_chain(&module_notify_list,
2358 MODULE_STATE_LIVE, mod);
2360 mutex_lock(&module_mutex);
2361 /* Drop initial reference. */
2363 module_free(mod, mod->module_init);
2364 mod->module_init = NULL;
2366 mod->init_text_size = 0;
2367 mutex_unlock(&module_mutex);
2372 static inline int within(unsigned long addr, void *start, unsigned long size)
2374 return ((void *)addr >= start && (void *)addr < start + size);
2377 #ifdef CONFIG_KALLSYMS
2379 * This ignores the intensely annoying "mapping symbols" found
2380 * in ARM ELF files: $a, $t and $d.
2382 static inline int is_arm_mapping_symbol(const char *str)
2384 return str[0] == '$' && strchr("atd", str[1])
2385 && (str[2] == '\0' || str[2] == '.');
2388 static const char *get_ksymbol(struct module *mod,
2390 unsigned long *size,
2391 unsigned long *offset)
2393 unsigned int i, best = 0;
2394 unsigned long nextval;
2396 /* At worse, next value is at end of module */
2397 if (within_module_init(addr, mod))
2398 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2400 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2402 /* Scan for closest preceeding symbol, and next symbol. (ELF
2403 starts real symbols at 1). */
2404 for (i = 1; i < mod->num_symtab; i++) {
2405 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2408 /* We ignore unnamed symbols: they're uninformative
2409 * and inserted at a whim. */
2410 if (mod->symtab[i].st_value <= addr
2411 && mod->symtab[i].st_value > mod->symtab[best].st_value
2412 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2413 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2415 if (mod->symtab[i].st_value > addr
2416 && mod->symtab[i].st_value < nextval
2417 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2418 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2419 nextval = mod->symtab[i].st_value;
2426 *size = nextval - mod->symtab[best].st_value;
2428 *offset = addr - mod->symtab[best].st_value;
2429 return mod->strtab + mod->symtab[best].st_name;
2432 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2433 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2434 const char *module_address_lookup(unsigned long addr,
2435 unsigned long *size,
2436 unsigned long *offset,
2441 const char *ret = NULL;
2444 list_for_each_entry_rcu(mod, &modules, list) {
2445 if (within_module_init(addr, mod) ||
2446 within_module_core(addr, mod)) {
2448 *modname = mod->name;
2449 ret = get_ksymbol(mod, addr, size, offset);
2453 /* Make a copy in here where it's safe */
2455 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2462 int lookup_module_symbol_name(unsigned long addr, char *symname)
2467 list_for_each_entry_rcu(mod, &modules, list) {
2468 if (within_module_init(addr, mod) ||
2469 within_module_core(addr, mod)) {
2472 sym = get_ksymbol(mod, addr, NULL, NULL);
2475 strlcpy(symname, sym, KSYM_NAME_LEN);
2485 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2486 unsigned long *offset, char *modname, char *name)
2491 list_for_each_entry_rcu(mod, &modules, list) {
2492 if (within_module_init(addr, mod) ||
2493 within_module_core(addr, mod)) {
2496 sym = get_ksymbol(mod, addr, size, offset);
2500 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2502 strlcpy(name, sym, KSYM_NAME_LEN);
2512 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2513 char *name, char *module_name, int *exported)
2518 list_for_each_entry_rcu(mod, &modules, list) {
2519 if (symnum < mod->num_symtab) {
2520 *value = mod->symtab[symnum].st_value;
2521 *type = mod->symtab[symnum].st_info;
2522 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2524 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2525 *exported = is_exported(name, *value, mod);
2529 symnum -= mod->num_symtab;
2535 static unsigned long mod_find_symname(struct module *mod, const char *name)
2539 for (i = 0; i < mod->num_symtab; i++)
2540 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2541 mod->symtab[i].st_info != 'U')
2542 return mod->symtab[i].st_value;
2546 /* Look for this name: can be of form module:name. */
2547 unsigned long module_kallsyms_lookup_name(const char *name)
2551 unsigned long ret = 0;
2553 /* Don't lock: we're in enough trouble already. */
2555 if ((colon = strchr(name, ':')) != NULL) {
2557 if ((mod = find_module(name)) != NULL)
2558 ret = mod_find_symname(mod, colon+1);
2561 list_for_each_entry_rcu(mod, &modules, list)
2562 if ((ret = mod_find_symname(mod, name)) != 0)
2568 #endif /* CONFIG_KALLSYMS */
2570 static char *module_flags(struct module *mod, char *buf)
2575 mod->state == MODULE_STATE_GOING ||
2576 mod->state == MODULE_STATE_COMING) {
2578 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2580 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2582 if (mod->taints & (1 << TAINT_CRAP))
2585 * TAINT_FORCED_RMMOD: could be added.
2586 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2590 /* Show a - for module-is-being-unloaded */
2591 if (mod->state == MODULE_STATE_GOING)
2593 /* Show a + for module-is-being-loaded */
2594 if (mod->state == MODULE_STATE_COMING)
2603 #ifdef CONFIG_PROC_FS
2604 /* Called by the /proc file system to return a list of modules. */
2605 static void *m_start(struct seq_file *m, loff_t *pos)
2607 mutex_lock(&module_mutex);
2608 return seq_list_start(&modules, *pos);
2611 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2613 return seq_list_next(p, &modules, pos);
2616 static void m_stop(struct seq_file *m, void *p)
2618 mutex_unlock(&module_mutex);
2621 static int m_show(struct seq_file *m, void *p)
2623 struct module *mod = list_entry(p, struct module, list);
2626 seq_printf(m, "%s %u",
2627 mod->name, mod->init_size + mod->core_size);
2628 print_unload_info(m, mod);
2630 /* Informative for users. */
2631 seq_printf(m, " %s",
2632 mod->state == MODULE_STATE_GOING ? "Unloading":
2633 mod->state == MODULE_STATE_COMING ? "Loading":
2635 /* Used by oprofile and other similar tools. */
2636 seq_printf(m, " 0x%p", mod->module_core);
2640 seq_printf(m, " %s", module_flags(mod, buf));
2642 seq_printf(m, "\n");
2646 /* Format: modulename size refcount deps address
2648 Where refcount is a number or -, and deps is a comma-separated list
2651 static const struct seq_operations modules_op = {
2658 static int modules_open(struct inode *inode, struct file *file)
2660 return seq_open(file, &modules_op);
2663 static const struct file_operations proc_modules_operations = {
2664 .open = modules_open,
2666 .llseek = seq_lseek,
2667 .release = seq_release,
2670 static int __init proc_modules_init(void)
2672 proc_create("modules", 0, NULL, &proc_modules_operations);
2675 module_init(proc_modules_init);
2678 /* Given an address, look for it in the module exception tables. */
2679 const struct exception_table_entry *search_module_extables(unsigned long addr)
2681 const struct exception_table_entry *e = NULL;
2685 list_for_each_entry_rcu(mod, &modules, list) {
2686 if (mod->num_exentries == 0)
2689 e = search_extable(mod->extable,
2690 mod->extable + mod->num_exentries - 1,
2697 /* Now, if we found one, we are running inside it now, hence
2698 we cannot unload the module, hence no refcnt needed. */
2703 * Is this a valid module address?
2705 int is_module_address(unsigned long addr)
2711 list_for_each_entry_rcu(mod, &modules, list) {
2712 if (within_module_core(addr, mod)) {
2724 /* Is this a valid kernel address? */
2725 __notrace_funcgraph struct module *__module_text_address(unsigned long addr)
2729 if (addr < module_addr_min || addr > module_addr_max)
2732 list_for_each_entry_rcu(mod, &modules, list)
2733 if (within(addr, mod->module_init, mod->init_text_size)
2734 || within(addr, mod->module_core, mod->core_text_size))
2739 struct module *module_text_address(unsigned long addr)
2744 mod = __module_text_address(addr);
2750 /* Don't grab lock, we're oopsing. */
2751 void print_modules(void)
2756 printk("Modules linked in:");
2757 /* Most callers should already have preempt disabled, but make sure */
2759 list_for_each_entry_rcu(mod, &modules, list)
2760 printk(" %s%s", mod->name, module_flags(mod, buf));
2762 if (last_unloaded_module[0])
2763 printk(" [last unloaded: %s]", last_unloaded_module);
2767 #ifdef CONFIG_MODVERSIONS
2768 /* Generate the signature for struct module here, too, for modversions. */
2769 void struct_module(struct module *mod) { return; }
2770 EXPORT_SYMBOL(struct_module);
2773 #ifdef CONFIG_MARKERS
2774 void module_update_markers(void)
2778 mutex_lock(&module_mutex);
2779 list_for_each_entry(mod, &modules, list)
2781 marker_update_probe_range(mod->markers,
2782 mod->markers + mod->num_markers);
2783 mutex_unlock(&module_mutex);
2787 #ifdef CONFIG_TRACEPOINTS
2788 void module_update_tracepoints(void)
2792 mutex_lock(&module_mutex);
2793 list_for_each_entry(mod, &modules, list)
2795 tracepoint_update_probe_range(mod->tracepoints,
2796 mod->tracepoints + mod->num_tracepoints);
2797 mutex_unlock(&module_mutex);
2801 * Returns 0 if current not found.
2802 * Returns 1 if current found.
2804 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2806 struct module *iter_mod;
2809 mutex_lock(&module_mutex);
2810 list_for_each_entry(iter_mod, &modules, list) {
2811 if (!iter_mod->taints) {
2813 * Sorted module list
2815 if (iter_mod < iter->module)
2817 else if (iter_mod > iter->module)
2818 iter->tracepoint = NULL;
2819 found = tracepoint_get_iter_range(&iter->tracepoint,
2820 iter_mod->tracepoints,
2821 iter_mod->tracepoints
2822 + iter_mod->num_tracepoints);
2824 iter->module = iter_mod;
2829 mutex_unlock(&module_mutex);