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/unwind.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <linux/license.h>
51 #include <asm/sections.h>
52 #include <linux/tracepoint.h>
53 #include <linux/ftrace.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 if (mutex_lock_interruptible(&module_mutex) != 0)
763 mod = find_module(name);
769 if (!list_empty(&mod->modules_which_use_me)) {
770 /* Other modules depend on us: get rid of them first. */
775 /* Doing init or already dying? */
776 if (mod->state != MODULE_STATE_LIVE) {
777 /* FIXME: if (force), slam module count and wake up
779 DEBUGP("%s already dying\n", mod->name);
784 /* If it has an init func, it must have an exit func to unload */
785 if (mod->init && !mod->exit) {
786 forced = try_force_unload(flags);
788 /* This module can't be removed */
794 /* Set this up before setting mod->state */
795 mod->waiter = current;
797 /* Stop the machine so refcounts can't move and disable module. */
798 ret = try_stop_module(mod, flags, &forced);
802 /* Never wait if forced. */
803 if (!forced && module_refcount(mod) != 0)
804 wait_for_zero_refcount(mod);
806 mutex_unlock(&module_mutex);
807 /* Final destruction now noone is using it. */
808 if (mod->exit != NULL)
810 blocking_notifier_call_chain(&module_notify_list,
811 MODULE_STATE_GOING, mod);
812 mutex_lock(&module_mutex);
813 /* Store the name of the last unloaded module for diagnostic purposes */
814 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
815 unregister_dynamic_debug_module(mod->name);
819 mutex_unlock(&module_mutex);
823 static inline void print_unload_info(struct seq_file *m, struct module *mod)
825 struct module_use *use;
826 int printed_something = 0;
828 seq_printf(m, " %u ", module_refcount(mod));
830 /* Always include a trailing , so userspace can differentiate
831 between this and the old multi-field proc format. */
832 list_for_each_entry(use, &mod->modules_which_use_me, list) {
833 printed_something = 1;
834 seq_printf(m, "%s,", use->module_which_uses->name);
837 if (mod->init != NULL && mod->exit == NULL) {
838 printed_something = 1;
839 seq_printf(m, "[permanent],");
842 if (!printed_something)
846 void __symbol_put(const char *symbol)
848 struct module *owner;
851 if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false)))
856 EXPORT_SYMBOL(__symbol_put);
858 void symbol_put_addr(void *addr)
860 struct module *modaddr;
862 if (core_kernel_text((unsigned long)addr))
865 if (!(modaddr = module_text_address((unsigned long)addr)))
869 EXPORT_SYMBOL_GPL(symbol_put_addr);
871 static ssize_t show_refcnt(struct module_attribute *mattr,
872 struct module *mod, char *buffer)
874 return sprintf(buffer, "%u\n", module_refcount(mod));
877 static struct module_attribute refcnt = {
878 .attr = { .name = "refcnt", .mode = 0444 },
882 void module_put(struct module *module)
885 unsigned int cpu = get_cpu();
886 local_dec(&module->ref[cpu].count);
887 /* Maybe they're waiting for us to drop reference? */
888 if (unlikely(!module_is_live(module)))
889 wake_up_process(module->waiter);
893 EXPORT_SYMBOL(module_put);
895 #else /* !CONFIG_MODULE_UNLOAD */
896 static inline void print_unload_info(struct seq_file *m, struct module *mod)
898 /* We don't know the usage count, or what modules are using. */
899 seq_printf(m, " - -");
902 static inline void module_unload_free(struct module *mod)
906 static inline int use_module(struct module *a, struct module *b)
908 return strong_try_module_get(b) == 0;
911 static inline void module_unload_init(struct module *mod)
914 #endif /* CONFIG_MODULE_UNLOAD */
916 static ssize_t show_initstate(struct module_attribute *mattr,
917 struct module *mod, char *buffer)
919 const char *state = "unknown";
921 switch (mod->state) {
922 case MODULE_STATE_LIVE:
925 case MODULE_STATE_COMING:
928 case MODULE_STATE_GOING:
932 return sprintf(buffer, "%s\n", state);
935 static struct module_attribute initstate = {
936 .attr = { .name = "initstate", .mode = 0444 },
937 .show = show_initstate,
940 static struct module_attribute *modinfo_attrs[] = {
944 #ifdef CONFIG_MODULE_UNLOAD
950 static const char vermagic[] = VERMAGIC_STRING;
952 static int try_to_force_load(struct module *mod, const char *symname)
954 #ifdef CONFIG_MODULE_FORCE_LOAD
955 if (!test_taint(TAINT_FORCED_MODULE))
956 printk("%s: no version for \"%s\" found: kernel tainted.\n",
958 add_taint_module(mod, TAINT_FORCED_MODULE);
965 #ifdef CONFIG_MODVERSIONS
966 static int check_version(Elf_Shdr *sechdrs,
967 unsigned int versindex,
970 const unsigned long *crc)
972 unsigned int i, num_versions;
973 struct modversion_info *versions;
975 /* Exporting module didn't supply crcs? OK, we're already tainted. */
979 /* No versions at all? modprobe --force does this. */
981 return try_to_force_load(mod, symname) == 0;
983 versions = (void *) sechdrs[versindex].sh_addr;
984 num_versions = sechdrs[versindex].sh_size
985 / sizeof(struct modversion_info);
987 for (i = 0; i < num_versions; i++) {
988 if (strcmp(versions[i].name, symname) != 0)
991 if (versions[i].crc == *crc)
993 DEBUGP("Found checksum %lX vs module %lX\n",
994 *crc, versions[i].crc);
998 printk(KERN_WARNING "%s: no symbol version for %s\n",
1003 printk("%s: disagrees about version of symbol %s\n",
1004 mod->name, symname);
1008 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1009 unsigned int versindex,
1012 const unsigned long *crc;
1014 if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false)))
1016 return check_version(sechdrs, versindex, "struct_module", mod, crc);
1019 /* First part is kernel version, which we ignore if module has crcs. */
1020 static inline int same_magic(const char *amagic, const char *bmagic,
1024 amagic += strcspn(amagic, " ");
1025 bmagic += strcspn(bmagic, " ");
1027 return strcmp(amagic, bmagic) == 0;
1030 static inline int check_version(Elf_Shdr *sechdrs,
1031 unsigned int versindex,
1032 const char *symname,
1034 const unsigned long *crc)
1039 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1040 unsigned int versindex,
1046 static inline int same_magic(const char *amagic, const char *bmagic,
1049 return strcmp(amagic, bmagic) == 0;
1051 #endif /* CONFIG_MODVERSIONS */
1053 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1054 Must be holding module_mutex. */
1055 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
1056 unsigned int versindex,
1060 struct module *owner;
1062 const unsigned long *crc;
1064 ret = find_symbol(name, &owner, &crc,
1065 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1066 if (!IS_ERR_VALUE(ret)) {
1067 /* use_module can fail due to OOM,
1068 or module initialization or unloading */
1069 if (!check_version(sechdrs, versindex, name, mod, crc) ||
1070 !use_module(mod, owner))
1077 * /sys/module/foo/sections stuff
1078 * J. Corbet <corbet@lwn.net>
1080 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1081 struct module_sect_attr
1083 struct module_attribute mattr;
1085 unsigned long address;
1088 struct module_sect_attrs
1090 struct attribute_group grp;
1091 unsigned int nsections;
1092 struct module_sect_attr attrs[0];
1095 static ssize_t module_sect_show(struct module_attribute *mattr,
1096 struct module *mod, char *buf)
1098 struct module_sect_attr *sattr =
1099 container_of(mattr, struct module_sect_attr, mattr);
1100 return sprintf(buf, "0x%lx\n", sattr->address);
1103 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1105 unsigned int section;
1107 for (section = 0; section < sect_attrs->nsections; section++)
1108 kfree(sect_attrs->attrs[section].name);
1112 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1113 char *secstrings, Elf_Shdr *sechdrs)
1115 unsigned int nloaded = 0, i, size[2];
1116 struct module_sect_attrs *sect_attrs;
1117 struct module_sect_attr *sattr;
1118 struct attribute **gattr;
1120 /* Count loaded sections and allocate structures */
1121 for (i = 0; i < nsect; i++)
1122 if (sechdrs[i].sh_flags & SHF_ALLOC)
1124 size[0] = ALIGN(sizeof(*sect_attrs)
1125 + nloaded * sizeof(sect_attrs->attrs[0]),
1126 sizeof(sect_attrs->grp.attrs[0]));
1127 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1128 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1129 if (sect_attrs == NULL)
1132 /* Setup section attributes. */
1133 sect_attrs->grp.name = "sections";
1134 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1136 sect_attrs->nsections = 0;
1137 sattr = §_attrs->attrs[0];
1138 gattr = §_attrs->grp.attrs[0];
1139 for (i = 0; i < nsect; i++) {
1140 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1142 sattr->address = sechdrs[i].sh_addr;
1143 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1145 if (sattr->name == NULL)
1147 sect_attrs->nsections++;
1148 sattr->mattr.show = module_sect_show;
1149 sattr->mattr.store = NULL;
1150 sattr->mattr.attr.name = sattr->name;
1151 sattr->mattr.attr.mode = S_IRUGO;
1152 *(gattr++) = &(sattr++)->mattr.attr;
1156 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1159 mod->sect_attrs = sect_attrs;
1162 free_sect_attrs(sect_attrs);
1165 static void remove_sect_attrs(struct module *mod)
1167 if (mod->sect_attrs) {
1168 sysfs_remove_group(&mod->mkobj.kobj,
1169 &mod->sect_attrs->grp);
1170 /* We are positive that no one is using any sect attrs
1171 * at this point. Deallocate immediately. */
1172 free_sect_attrs(mod->sect_attrs);
1173 mod->sect_attrs = NULL;
1178 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1181 struct module_notes_attrs {
1182 struct kobject *dir;
1184 struct bin_attribute attrs[0];
1187 static ssize_t module_notes_read(struct kobject *kobj,
1188 struct bin_attribute *bin_attr,
1189 char *buf, loff_t pos, size_t count)
1192 * The caller checked the pos and count against our size.
1194 memcpy(buf, bin_attr->private + pos, count);
1198 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1201 if (notes_attrs->dir) {
1203 sysfs_remove_bin_file(notes_attrs->dir,
1204 ¬es_attrs->attrs[i]);
1205 kobject_put(notes_attrs->dir);
1210 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1211 char *secstrings, Elf_Shdr *sechdrs)
1213 unsigned int notes, loaded, i;
1214 struct module_notes_attrs *notes_attrs;
1215 struct bin_attribute *nattr;
1217 /* Count notes sections and allocate structures. */
1219 for (i = 0; i < nsect; i++)
1220 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1221 (sechdrs[i].sh_type == SHT_NOTE))
1227 notes_attrs = kzalloc(sizeof(*notes_attrs)
1228 + notes * sizeof(notes_attrs->attrs[0]),
1230 if (notes_attrs == NULL)
1233 notes_attrs->notes = notes;
1234 nattr = ¬es_attrs->attrs[0];
1235 for (loaded = i = 0; i < nsect; ++i) {
1236 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1238 if (sechdrs[i].sh_type == SHT_NOTE) {
1239 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1240 nattr->attr.mode = S_IRUGO;
1241 nattr->size = sechdrs[i].sh_size;
1242 nattr->private = (void *) sechdrs[i].sh_addr;
1243 nattr->read = module_notes_read;
1249 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1250 if (!notes_attrs->dir)
1253 for (i = 0; i < notes; ++i)
1254 if (sysfs_create_bin_file(notes_attrs->dir,
1255 ¬es_attrs->attrs[i]))
1258 mod->notes_attrs = notes_attrs;
1262 free_notes_attrs(notes_attrs, i);
1265 static void remove_notes_attrs(struct module *mod)
1267 if (mod->notes_attrs)
1268 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1273 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1274 char *sectstrings, Elf_Shdr *sechdrs)
1278 static inline void remove_sect_attrs(struct module *mod)
1282 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1283 char *sectstrings, Elf_Shdr *sechdrs)
1287 static inline void remove_notes_attrs(struct module *mod)
1293 int module_add_modinfo_attrs(struct module *mod)
1295 struct module_attribute *attr;
1296 struct module_attribute *temp_attr;
1300 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1301 (ARRAY_SIZE(modinfo_attrs) + 1)),
1303 if (!mod->modinfo_attrs)
1306 temp_attr = mod->modinfo_attrs;
1307 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1309 (attr->test && attr->test(mod))) {
1310 memcpy(temp_attr, attr, sizeof(*temp_attr));
1311 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1318 void module_remove_modinfo_attrs(struct module *mod)
1320 struct module_attribute *attr;
1323 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1324 /* pick a field to test for end of list */
1325 if (!attr->attr.name)
1327 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1331 kfree(mod->modinfo_attrs);
1334 int mod_sysfs_init(struct module *mod)
1337 struct kobject *kobj;
1339 if (!module_sysfs_initialized) {
1340 printk(KERN_ERR "%s: module sysfs not initialized\n",
1346 kobj = kset_find_obj(module_kset, mod->name);
1348 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1354 mod->mkobj.mod = mod;
1356 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1357 mod->mkobj.kobj.kset = module_kset;
1358 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1361 kobject_put(&mod->mkobj.kobj);
1363 /* delay uevent until full sysfs population */
1368 int mod_sysfs_setup(struct module *mod,
1369 struct kernel_param *kparam,
1370 unsigned int num_params)
1374 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1375 if (!mod->holders_dir) {
1380 err = module_param_sysfs_setup(mod, kparam, num_params);
1382 goto out_unreg_holders;
1384 err = module_add_modinfo_attrs(mod);
1386 goto out_unreg_param;
1388 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1392 module_param_sysfs_remove(mod);
1394 kobject_put(mod->holders_dir);
1396 kobject_put(&mod->mkobj.kobj);
1400 static void mod_sysfs_fini(struct module *mod)
1402 kobject_put(&mod->mkobj.kobj);
1405 #else /* CONFIG_SYSFS */
1407 static void mod_sysfs_fini(struct module *mod)
1411 #endif /* CONFIG_SYSFS */
1413 static void mod_kobject_remove(struct module *mod)
1415 module_remove_modinfo_attrs(mod);
1416 module_param_sysfs_remove(mod);
1417 kobject_put(mod->mkobj.drivers_dir);
1418 kobject_put(mod->holders_dir);
1419 mod_sysfs_fini(mod);
1423 * unlink the module with the whole machine is stopped with interrupts off
1424 * - this defends against kallsyms not taking locks
1426 static int __unlink_module(void *_mod)
1428 struct module *mod = _mod;
1429 list_del(&mod->list);
1433 /* Free a module, remove from lists, etc (must hold module_mutex). */
1434 static void free_module(struct module *mod)
1436 /* Delete from various lists */
1437 stop_machine(__unlink_module, mod, NULL);
1438 remove_notes_attrs(mod);
1439 remove_sect_attrs(mod);
1440 mod_kobject_remove(mod);
1442 unwind_remove_table(mod->unwind_info, 0);
1444 /* Arch-specific cleanup. */
1445 module_arch_cleanup(mod);
1447 /* Module unload stuff */
1448 module_unload_free(mod);
1450 /* release any pointers to mcount in this module */
1451 ftrace_release(mod->module_core, mod->core_size);
1453 /* This may be NULL, but that's OK */
1454 module_free(mod, mod->module_init);
1457 percpu_modfree(mod->percpu);
1459 /* Free lock-classes: */
1460 lockdep_free_key_range(mod->module_core, mod->core_size);
1462 /* Finally, free the core (containing the module structure) */
1463 module_free(mod, mod->module_core);
1466 void *__symbol_get(const char *symbol)
1468 struct module *owner;
1469 unsigned long value;
1472 value = find_symbol(symbol, &owner, NULL, true, true);
1473 if (IS_ERR_VALUE(value))
1475 else if (strong_try_module_get(owner))
1479 return (void *)value;
1481 EXPORT_SYMBOL_GPL(__symbol_get);
1484 * Ensure that an exported symbol [global namespace] does not already exist
1485 * in the kernel or in some other module's exported symbol table.
1487 static int verify_export_symbols(struct module *mod)
1490 struct module *owner;
1491 const struct kernel_symbol *s;
1493 const struct kernel_symbol *sym;
1496 { mod->syms, mod->num_syms },
1497 { mod->gpl_syms, mod->num_gpl_syms },
1498 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1499 #ifdef CONFIG_UNUSED_SYMBOLS
1500 { mod->unused_syms, mod->num_unused_syms },
1501 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1505 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1506 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1507 if (!IS_ERR_VALUE(find_symbol(s->name, &owner,
1508 NULL, true, false))) {
1510 "%s: exports duplicate symbol %s"
1512 mod->name, s->name, module_name(owner));
1520 /* Change all symbols so that st_value encodes the pointer directly. */
1521 static int simplify_symbols(Elf_Shdr *sechdrs,
1522 unsigned int symindex,
1524 unsigned int versindex,
1525 unsigned int pcpuindex,
1528 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1529 unsigned long secbase;
1530 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1533 for (i = 1; i < n; i++) {
1534 switch (sym[i].st_shndx) {
1536 /* We compiled with -fno-common. These are not
1537 supposed to happen. */
1538 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1539 printk("%s: please compile with -fno-common\n",
1545 /* Don't need to do anything */
1546 DEBUGP("Absolute symbol: 0x%08lx\n",
1547 (long)sym[i].st_value);
1552 = resolve_symbol(sechdrs, versindex,
1553 strtab + sym[i].st_name, mod);
1555 /* Ok if resolved. */
1556 if (!IS_ERR_VALUE(sym[i].st_value))
1559 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1562 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1563 mod->name, strtab + sym[i].st_name);
1568 /* Divert to percpu allocation if a percpu var. */
1569 if (sym[i].st_shndx == pcpuindex)
1570 secbase = (unsigned long)mod->percpu;
1572 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1573 sym[i].st_value += secbase;
1581 /* Additional bytes needed by arch in front of individual sections */
1582 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1583 unsigned int section)
1585 /* default implementation just returns zero */
1589 /* Update size with this section: return offset. */
1590 static long get_offset(struct module *mod, unsigned int *size,
1591 Elf_Shdr *sechdr, unsigned int section)
1595 *size += arch_mod_section_prepend(mod, section);
1596 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1597 *size = ret + sechdr->sh_size;
1601 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1602 might -- code, read-only data, read-write data, small data. Tally
1603 sizes, and place the offsets into sh_entsize fields: high bit means it
1605 static void layout_sections(struct module *mod,
1606 const Elf_Ehdr *hdr,
1608 const char *secstrings)
1610 static unsigned long const masks[][2] = {
1611 /* NOTE: all executable code must be the first section
1612 * in this array; otherwise modify the text_size
1613 * finder in the two loops below */
1614 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1615 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1616 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1617 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1621 for (i = 0; i < hdr->e_shnum; i++)
1622 sechdrs[i].sh_entsize = ~0UL;
1624 DEBUGP("Core section allocation order:\n");
1625 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1626 for (i = 0; i < hdr->e_shnum; ++i) {
1627 Elf_Shdr *s = &sechdrs[i];
1629 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1630 || (s->sh_flags & masks[m][1])
1631 || s->sh_entsize != ~0UL
1632 || strncmp(secstrings + s->sh_name,
1635 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1636 DEBUGP("\t%s\n", secstrings + s->sh_name);
1639 mod->core_text_size = mod->core_size;
1642 DEBUGP("Init section allocation order:\n");
1643 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1644 for (i = 0; i < hdr->e_shnum; ++i) {
1645 Elf_Shdr *s = &sechdrs[i];
1647 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1648 || (s->sh_flags & masks[m][1])
1649 || s->sh_entsize != ~0UL
1650 || strncmp(secstrings + s->sh_name,
1653 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1654 | INIT_OFFSET_MASK);
1655 DEBUGP("\t%s\n", secstrings + s->sh_name);
1658 mod->init_text_size = mod->init_size;
1662 static void set_license(struct module *mod, const char *license)
1665 license = "unspecified";
1667 if (!license_is_gpl_compatible(license)) {
1668 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1669 printk(KERN_WARNING "%s: module license '%s' taints "
1670 "kernel.\n", mod->name, license);
1671 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1675 /* Parse tag=value strings from .modinfo section */
1676 static char *next_string(char *string, unsigned long *secsize)
1678 /* Skip non-zero chars */
1681 if ((*secsize)-- <= 1)
1685 /* Skip any zero padding. */
1686 while (!string[0]) {
1688 if ((*secsize)-- <= 1)
1694 static char *get_modinfo(Elf_Shdr *sechdrs,
1699 unsigned int taglen = strlen(tag);
1700 unsigned long size = sechdrs[info].sh_size;
1702 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1703 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1704 return p + taglen + 1;
1709 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1710 unsigned int infoindex)
1712 struct module_attribute *attr;
1715 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1718 get_modinfo(sechdrs,
1724 #ifdef CONFIG_KALLSYMS
1726 /* lookup symbol in given range of kernel_symbols */
1727 static const struct kernel_symbol *lookup_symbol(const char *name,
1728 const struct kernel_symbol *start,
1729 const struct kernel_symbol *stop)
1731 const struct kernel_symbol *ks = start;
1732 for (; ks < stop; ks++)
1733 if (strcmp(ks->name, name) == 0)
1738 static int is_exported(const char *name, unsigned long value,
1739 const struct module *mod)
1741 const struct kernel_symbol *ks;
1743 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1745 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1746 return ks != NULL && ks->value == value;
1750 static char elf_type(const Elf_Sym *sym,
1752 const char *secstrings,
1755 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1756 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1761 if (sym->st_shndx == SHN_UNDEF)
1763 if (sym->st_shndx == SHN_ABS)
1765 if (sym->st_shndx >= SHN_LORESERVE)
1767 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1769 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1770 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1771 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1773 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1778 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1779 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1784 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1785 ".debug", strlen(".debug")) == 0)
1790 static void add_kallsyms(struct module *mod,
1792 unsigned int symindex,
1793 unsigned int strindex,
1794 const char *secstrings)
1798 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1799 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1800 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1802 /* Set types up while we still have access to sections. */
1803 for (i = 0; i < mod->num_symtab; i++)
1804 mod->symtab[i].st_info
1805 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1808 static inline void add_kallsyms(struct module *mod,
1810 unsigned int symindex,
1811 unsigned int strindex,
1812 const char *secstrings)
1815 #endif /* CONFIG_KALLSYMS */
1817 static void dynamic_printk_setup(struct mod_debug *debug, unsigned int num)
1819 #ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
1822 for (i = 0; i < num; i++) {
1823 register_dynamic_debug_module(debug[i].modname,
1825 debug[i].logical_modname,
1826 debug[i].flag_names,
1827 debug[i].hash, debug[i].hash2);
1829 #endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
1832 static void *module_alloc_update_bounds(unsigned long size)
1834 void *ret = module_alloc(size);
1837 /* Update module bounds. */
1838 if ((unsigned long)ret < module_addr_min)
1839 module_addr_min = (unsigned long)ret;
1840 if ((unsigned long)ret + size > module_addr_max)
1841 module_addr_max = (unsigned long)ret + size;
1846 /* Allocate and load the module: note that size of section 0 is always
1847 zero, and we rely on this for optional sections. */
1848 static noinline struct module *load_module(void __user *umod,
1850 const char __user *uargs)
1854 char *secstrings, *args, *modmagic, *strtab = NULL;
1857 unsigned int symindex = 0;
1858 unsigned int strindex = 0;
1859 unsigned int modindex, versindex, infoindex, pcpuindex;
1860 unsigned int unwindex = 0;
1861 unsigned int num_kp, num_mcount;
1862 struct kernel_param *kp;
1865 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1866 unsigned long *mseg;
1867 mm_segment_t old_fs;
1869 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1871 if (len < sizeof(*hdr))
1872 return ERR_PTR(-ENOEXEC);
1874 /* Suck in entire file: we'll want most of it. */
1875 /* vmalloc barfs on "unusual" numbers. Check here */
1876 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1877 return ERR_PTR(-ENOMEM);
1878 if (copy_from_user(hdr, umod, len) != 0) {
1883 /* Sanity checks against insmoding binaries or wrong arch,
1884 weird elf version */
1885 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1886 || hdr->e_type != ET_REL
1887 || !elf_check_arch(hdr)
1888 || hdr->e_shentsize != sizeof(*sechdrs)) {
1893 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1896 /* Convenience variables */
1897 sechdrs = (void *)hdr + hdr->e_shoff;
1898 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1899 sechdrs[0].sh_addr = 0;
1901 for (i = 1; i < hdr->e_shnum; i++) {
1902 if (sechdrs[i].sh_type != SHT_NOBITS
1903 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1906 /* Mark all sections sh_addr with their address in the
1908 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1910 /* Internal symbols and strings. */
1911 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1913 strindex = sechdrs[i].sh_link;
1914 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1916 #ifndef CONFIG_MODULE_UNLOAD
1917 /* Don't load .exit sections */
1918 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1919 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1923 modindex = find_sec(hdr, sechdrs, secstrings,
1924 ".gnu.linkonce.this_module");
1926 printk(KERN_WARNING "No module found in object\n");
1930 /* This is temporary: point mod into copy of data. */
1931 mod = (void *)sechdrs[modindex].sh_addr;
1933 if (symindex == 0) {
1934 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1940 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1941 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1942 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1943 #ifdef ARCH_UNWIND_SECTION_NAME
1944 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1947 /* Don't keep modinfo and version sections. */
1948 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1949 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1950 #ifdef CONFIG_KALLSYMS
1951 /* Keep symbol and string tables for decoding later. */
1952 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1953 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1956 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
1958 /* Check module struct version now, before we try to use module. */
1959 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1964 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1965 /* This is allowed: modprobe --force will invalidate it. */
1967 err = try_to_force_load(mod, "magic");
1970 } else if (!same_magic(modmagic, vermagic, versindex)) {
1971 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1972 mod->name, modmagic, vermagic);
1977 staging = get_modinfo(sechdrs, infoindex, "staging");
1979 add_taint_module(mod, TAINT_CRAP);
1980 printk(KERN_WARNING "%s: module is from the staging directory,"
1981 " the quality is unknown, you have been warned.\n",
1985 /* Now copy in args */
1986 args = strndup_user(uargs, ~0UL >> 1);
1988 err = PTR_ERR(args);
1992 if (find_module(mod->name)) {
1997 mod->state = MODULE_STATE_COMING;
1999 /* Allow arches to frob section contents and sizes. */
2000 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2005 /* We have a special allocation for this section. */
2006 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2007 sechdrs[pcpuindex].sh_addralign,
2013 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2014 mod->percpu = percpu;
2017 /* Determine total sizes, and put offsets in sh_entsize. For now
2018 this is done generically; there doesn't appear to be any
2019 special cases for the architectures. */
2020 layout_sections(mod, hdr, sechdrs, secstrings);
2022 /* Do the allocs. */
2023 ptr = module_alloc_update_bounds(mod->core_size);
2028 memset(ptr, 0, mod->core_size);
2029 mod->module_core = ptr;
2031 ptr = module_alloc_update_bounds(mod->init_size);
2032 if (!ptr && mod->init_size) {
2036 memset(ptr, 0, mod->init_size);
2037 mod->module_init = ptr;
2039 /* Transfer each section which specifies SHF_ALLOC */
2040 DEBUGP("final section addresses:\n");
2041 for (i = 0; i < hdr->e_shnum; i++) {
2044 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2047 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2048 dest = mod->module_init
2049 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2051 dest = mod->module_core + sechdrs[i].sh_entsize;
2053 if (sechdrs[i].sh_type != SHT_NOBITS)
2054 memcpy(dest, (void *)sechdrs[i].sh_addr,
2055 sechdrs[i].sh_size);
2056 /* Update sh_addr to point to copy in image. */
2057 sechdrs[i].sh_addr = (unsigned long)dest;
2058 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2060 /* Module has been moved. */
2061 mod = (void *)sechdrs[modindex].sh_addr;
2063 /* Now we've moved module, initialize linked lists, etc. */
2064 module_unload_init(mod);
2066 /* add kobject, so we can reference it. */
2067 err = mod_sysfs_init(mod);
2071 /* Set up license info based on the info section */
2072 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2075 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2076 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2077 * using GPL-only symbols it needs.
2079 if (strcmp(mod->name, "ndiswrapper") == 0)
2080 add_taint(TAINT_PROPRIETARY_MODULE);
2082 /* driverloader was caught wrongly pretending to be under GPL */
2083 if (strcmp(mod->name, "driverloader") == 0)
2084 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2086 /* Set up MODINFO_ATTR fields */
2087 setup_modinfo(mod, sechdrs, infoindex);
2089 /* Fix up syms, so that st_value is a pointer to location. */
2090 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2095 /* Now we've got everything in the final locations, we can
2096 * find optional sections. */
2097 kp = section_objs(hdr, sechdrs, secstrings, "__param", sizeof(*kp),
2099 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2100 sizeof(*mod->syms), &mod->num_syms);
2101 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2102 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2103 sizeof(*mod->gpl_syms),
2104 &mod->num_gpl_syms);
2105 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2106 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2107 "__ksymtab_gpl_future",
2108 sizeof(*mod->gpl_future_syms),
2109 &mod->num_gpl_future_syms);
2110 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2111 "__kcrctab_gpl_future");
2113 #ifdef CONFIG_UNUSED_SYMBOLS
2114 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2116 sizeof(*mod->unused_syms),
2117 &mod->num_unused_syms);
2118 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2119 "__kcrctab_unused");
2120 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2121 "__ksymtab_unused_gpl",
2122 sizeof(*mod->unused_gpl_syms),
2123 &mod->num_unused_gpl_syms);
2124 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2125 "__kcrctab_unused_gpl");
2128 #ifdef CONFIG_MARKERS
2129 mod->markers = section_objs(hdr, sechdrs, secstrings, "__markers",
2130 sizeof(*mod->markers), &mod->num_markers);
2132 #ifdef CONFIG_TRACEPOINTS
2133 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2135 sizeof(*mod->tracepoints),
2136 &mod->num_tracepoints);
2139 #ifdef CONFIG_MODVERSIONS
2140 if ((mod->num_syms && !mod->crcs)
2141 || (mod->num_gpl_syms && !mod->gpl_crcs)
2142 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2143 #ifdef CONFIG_UNUSED_SYMBOLS
2144 || (mod->num_unused_syms && !mod->unused_crcs)
2145 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2148 printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name);
2149 err = try_to_force_load(mod, "nocrc");
2155 /* Now do relocations. */
2156 for (i = 1; i < hdr->e_shnum; i++) {
2157 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2158 unsigned int info = sechdrs[i].sh_info;
2160 /* Not a valid relocation section? */
2161 if (info >= hdr->e_shnum)
2164 /* Don't bother with non-allocated sections */
2165 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2168 if (sechdrs[i].sh_type == SHT_REL)
2169 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2170 else if (sechdrs[i].sh_type == SHT_RELA)
2171 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2177 /* Find duplicate symbols */
2178 err = verify_export_symbols(mod);
2182 /* Set up and sort exception table */
2183 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2184 sizeof(*mod->extable), &mod->num_exentries);
2185 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2187 /* Finally, copy percpu area over. */
2188 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2189 sechdrs[pcpuindex].sh_size);
2191 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
2194 struct mod_debug *debug;
2195 unsigned int num_debug;
2197 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2198 sizeof(*debug), &num_debug);
2199 dynamic_printk_setup(debug, num_debug);
2202 /* sechdrs[0].sh_size is always zero */
2203 mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc",
2204 sizeof(*mseg), &num_mcount);
2205 ftrace_init_module(mod, mseg, mseg + num_mcount);
2207 err = module_finalize(hdr, sechdrs, mod);
2211 /* flush the icache in correct context */
2216 * Flush the instruction cache, since we've played with text.
2217 * Do it before processing of module parameters, so the module
2218 * can provide parameter accessor functions of its own.
2220 if (mod->module_init)
2221 flush_icache_range((unsigned long)mod->module_init,
2222 (unsigned long)mod->module_init
2224 flush_icache_range((unsigned long)mod->module_core,
2225 (unsigned long)mod->module_core + mod->core_size);
2230 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2231 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2234 /* Now sew it into the lists so we can get lockdep and oops
2235 * info during argument parsing. Noone should access us, since
2236 * strong_try_module_get() will fail.
2237 * lockdep/oops can run asynchronous, so use the RCU list insertion
2238 * function to insert in a way safe to concurrent readers.
2239 * The mutex protects against concurrent writers.
2241 list_add_rcu(&mod->list, &modules);
2243 err = parse_args(mod->name, mod->args, kp, num_kp, NULL);
2247 err = mod_sysfs_setup(mod, kp, num_kp);
2250 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2251 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2253 /* Size of section 0 is 0, so this works well if no unwind info. */
2254 mod->unwind_info = unwind_add_table(mod,
2255 (void *)sechdrs[unwindex].sh_addr,
2256 sechdrs[unwindex].sh_size);
2258 /* Get rid of temporary copy */
2265 stop_machine(__unlink_module, mod, NULL);
2266 module_arch_cleanup(mod);
2268 kobject_del(&mod->mkobj.kobj);
2269 kobject_put(&mod->mkobj.kobj);
2270 ftrace_release(mod->module_core, mod->core_size);
2272 module_unload_free(mod);
2273 module_free(mod, mod->module_init);
2275 module_free(mod, mod->module_core);
2278 percpu_modfree(percpu);
2283 return ERR_PTR(err);
2286 printk(KERN_ERR "Module len %lu truncated\n", len);
2291 /* This is where the real work happens */
2293 sys_init_module(void __user *umod,
2295 const char __user *uargs)
2300 /* Must have permission */
2301 if (!capable(CAP_SYS_MODULE))
2304 /* Only one module load at a time, please */
2305 if (mutex_lock_interruptible(&module_mutex) != 0)
2308 /* Do all the hard work */
2309 mod = load_module(umod, len, uargs);
2311 mutex_unlock(&module_mutex);
2312 return PTR_ERR(mod);
2315 /* Drop lock so they can recurse */
2316 mutex_unlock(&module_mutex);
2318 blocking_notifier_call_chain(&module_notify_list,
2319 MODULE_STATE_COMING, mod);
2321 /* Start the module */
2322 if (mod->init != NULL)
2323 ret = do_one_initcall(mod->init);
2325 /* Init routine failed: abort. Try to protect us from
2326 buggy refcounters. */
2327 mod->state = MODULE_STATE_GOING;
2328 synchronize_sched();
2330 blocking_notifier_call_chain(&module_notify_list,
2331 MODULE_STATE_GOING, mod);
2332 mutex_lock(&module_mutex);
2334 mutex_unlock(&module_mutex);
2335 wake_up(&module_wq);
2339 printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, "
2340 "it should follow 0/-E convention\n"
2341 KERN_WARNING "%s: loading module anyway...\n",
2342 __func__, mod->name, ret,
2347 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2348 mod->state = MODULE_STATE_LIVE;
2349 wake_up(&module_wq);
2351 mutex_lock(&module_mutex);
2352 /* Drop initial reference. */
2354 unwind_remove_table(mod->unwind_info, 1);
2355 module_free(mod, mod->module_init);
2356 mod->module_init = NULL;
2358 mod->init_text_size = 0;
2359 mutex_unlock(&module_mutex);
2364 static inline int within(unsigned long addr, void *start, unsigned long size)
2366 return ((void *)addr >= start && (void *)addr < start + size);
2369 #ifdef CONFIG_KALLSYMS
2371 * This ignores the intensely annoying "mapping symbols" found
2372 * in ARM ELF files: $a, $t and $d.
2374 static inline int is_arm_mapping_symbol(const char *str)
2376 return str[0] == '$' && strchr("atd", str[1])
2377 && (str[2] == '\0' || str[2] == '.');
2380 static const char *get_ksymbol(struct module *mod,
2382 unsigned long *size,
2383 unsigned long *offset)
2385 unsigned int i, best = 0;
2386 unsigned long nextval;
2388 /* At worse, next value is at end of module */
2389 if (within(addr, mod->module_init, mod->init_size))
2390 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2392 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2394 /* Scan for closest preceeding symbol, and next symbol. (ELF
2395 starts real symbols at 1). */
2396 for (i = 1; i < mod->num_symtab; i++) {
2397 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2400 /* We ignore unnamed symbols: they're uninformative
2401 * and inserted at a whim. */
2402 if (mod->symtab[i].st_value <= addr
2403 && mod->symtab[i].st_value > mod->symtab[best].st_value
2404 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2405 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2407 if (mod->symtab[i].st_value > addr
2408 && mod->symtab[i].st_value < nextval
2409 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2410 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2411 nextval = mod->symtab[i].st_value;
2418 *size = nextval - mod->symtab[best].st_value;
2420 *offset = addr - mod->symtab[best].st_value;
2421 return mod->strtab + mod->symtab[best].st_name;
2424 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2425 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2426 const char *module_address_lookup(unsigned long addr,
2427 unsigned long *size,
2428 unsigned long *offset,
2433 const char *ret = NULL;
2436 list_for_each_entry_rcu(mod, &modules, list) {
2437 if (within(addr, mod->module_init, mod->init_size)
2438 || within(addr, mod->module_core, mod->core_size)) {
2440 *modname = mod->name;
2441 ret = get_ksymbol(mod, addr, size, offset);
2445 /* Make a copy in here where it's safe */
2447 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2454 int lookup_module_symbol_name(unsigned long addr, char *symname)
2459 list_for_each_entry_rcu(mod, &modules, list) {
2460 if (within(addr, mod->module_init, mod->init_size) ||
2461 within(addr, mod->module_core, mod->core_size)) {
2464 sym = get_ksymbol(mod, addr, NULL, NULL);
2467 strlcpy(symname, sym, KSYM_NAME_LEN);
2477 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2478 unsigned long *offset, char *modname, char *name)
2483 list_for_each_entry_rcu(mod, &modules, list) {
2484 if (within(addr, mod->module_init, mod->init_size) ||
2485 within(addr, mod->module_core, mod->core_size)) {
2488 sym = get_ksymbol(mod, addr, size, offset);
2492 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2494 strlcpy(name, sym, KSYM_NAME_LEN);
2504 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2505 char *name, char *module_name, int *exported)
2510 list_for_each_entry_rcu(mod, &modules, list) {
2511 if (symnum < mod->num_symtab) {
2512 *value = mod->symtab[symnum].st_value;
2513 *type = mod->symtab[symnum].st_info;
2514 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2516 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2517 *exported = is_exported(name, *value, mod);
2521 symnum -= mod->num_symtab;
2527 static unsigned long mod_find_symname(struct module *mod, const char *name)
2531 for (i = 0; i < mod->num_symtab; i++)
2532 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2533 mod->symtab[i].st_info != 'U')
2534 return mod->symtab[i].st_value;
2538 /* Look for this name: can be of form module:name. */
2539 unsigned long module_kallsyms_lookup_name(const char *name)
2543 unsigned long ret = 0;
2545 /* Don't lock: we're in enough trouble already. */
2547 if ((colon = strchr(name, ':')) != NULL) {
2549 if ((mod = find_module(name)) != NULL)
2550 ret = mod_find_symname(mod, colon+1);
2553 list_for_each_entry_rcu(mod, &modules, list)
2554 if ((ret = mod_find_symname(mod, name)) != 0)
2560 #endif /* CONFIG_KALLSYMS */
2562 static char *module_flags(struct module *mod, char *buf)
2567 mod->state == MODULE_STATE_GOING ||
2568 mod->state == MODULE_STATE_COMING) {
2570 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2572 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2574 if (mod->taints & (1 << TAINT_CRAP))
2577 * TAINT_FORCED_RMMOD: could be added.
2578 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2582 /* Show a - for module-is-being-unloaded */
2583 if (mod->state == MODULE_STATE_GOING)
2585 /* Show a + for module-is-being-loaded */
2586 if (mod->state == MODULE_STATE_COMING)
2595 #ifdef CONFIG_PROC_FS
2596 /* Called by the /proc file system to return a list of modules. */
2597 static void *m_start(struct seq_file *m, loff_t *pos)
2599 mutex_lock(&module_mutex);
2600 return seq_list_start(&modules, *pos);
2603 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2605 return seq_list_next(p, &modules, pos);
2608 static void m_stop(struct seq_file *m, void *p)
2610 mutex_unlock(&module_mutex);
2613 static int m_show(struct seq_file *m, void *p)
2615 struct module *mod = list_entry(p, struct module, list);
2618 seq_printf(m, "%s %u",
2619 mod->name, mod->init_size + mod->core_size);
2620 print_unload_info(m, mod);
2622 /* Informative for users. */
2623 seq_printf(m, " %s",
2624 mod->state == MODULE_STATE_GOING ? "Unloading":
2625 mod->state == MODULE_STATE_COMING ? "Loading":
2627 /* Used by oprofile and other similar tools. */
2628 seq_printf(m, " 0x%p", mod->module_core);
2632 seq_printf(m, " %s", module_flags(mod, buf));
2634 seq_printf(m, "\n");
2638 /* Format: modulename size refcount deps address
2640 Where refcount is a number or -, and deps is a comma-separated list
2643 static const struct seq_operations modules_op = {
2650 static int modules_open(struct inode *inode, struct file *file)
2652 return seq_open(file, &modules_op);
2655 static const struct file_operations proc_modules_operations = {
2656 .open = modules_open,
2658 .llseek = seq_lseek,
2659 .release = seq_release,
2662 static int __init proc_modules_init(void)
2664 proc_create("modules", 0, NULL, &proc_modules_operations);
2667 module_init(proc_modules_init);
2670 /* Given an address, look for it in the module exception tables. */
2671 const struct exception_table_entry *search_module_extables(unsigned long addr)
2673 const struct exception_table_entry *e = NULL;
2677 list_for_each_entry_rcu(mod, &modules, list) {
2678 if (mod->num_exentries == 0)
2681 e = search_extable(mod->extable,
2682 mod->extable + mod->num_exentries - 1,
2689 /* Now, if we found one, we are running inside it now, hence
2690 we cannot unload the module, hence no refcnt needed. */
2695 * Is this a valid module address?
2697 int is_module_address(unsigned long addr)
2703 list_for_each_entry_rcu(mod, &modules, list) {
2704 if (within(addr, mod->module_core, mod->core_size)) {
2716 /* Is this a valid kernel address? */
2717 __notrace_funcgraph struct module *__module_text_address(unsigned long addr)
2721 if (addr < module_addr_min || addr > module_addr_max)
2724 list_for_each_entry_rcu(mod, &modules, list)
2725 if (within(addr, mod->module_init, mod->init_text_size)
2726 || within(addr, mod->module_core, mod->core_text_size))
2731 struct module *module_text_address(unsigned long addr)
2736 mod = __module_text_address(addr);
2742 /* Don't grab lock, we're oopsing. */
2743 void print_modules(void)
2748 printk("Modules linked in:");
2749 /* Most callers should already have preempt disabled, but make sure */
2751 list_for_each_entry_rcu(mod, &modules, list)
2752 printk(" %s%s", mod->name, module_flags(mod, buf));
2754 if (last_unloaded_module[0])
2755 printk(" [last unloaded: %s]", last_unloaded_module);
2759 #ifdef CONFIG_MODVERSIONS
2760 /* Generate the signature for struct module here, too, for modversions. */
2761 void struct_module(struct module *mod) { return; }
2762 EXPORT_SYMBOL(struct_module);
2765 #ifdef CONFIG_MARKERS
2766 void module_update_markers(void)
2770 mutex_lock(&module_mutex);
2771 list_for_each_entry(mod, &modules, list)
2773 marker_update_probe_range(mod->markers,
2774 mod->markers + mod->num_markers);
2775 mutex_unlock(&module_mutex);
2779 #ifdef CONFIG_TRACEPOINTS
2780 void module_update_tracepoints(void)
2784 mutex_lock(&module_mutex);
2785 list_for_each_entry(mod, &modules, list)
2787 tracepoint_update_probe_range(mod->tracepoints,
2788 mod->tracepoints + mod->num_tracepoints);
2789 mutex_unlock(&module_mutex);
2793 * Returns 0 if current not found.
2794 * Returns 1 if current found.
2796 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2798 struct module *iter_mod;
2801 mutex_lock(&module_mutex);
2802 list_for_each_entry(iter_mod, &modules, list) {
2803 if (!iter_mod->taints) {
2805 * Sorted module list
2807 if (iter_mod < iter->module)
2809 else if (iter_mod > iter->module)
2810 iter->tracepoint = NULL;
2811 found = tracepoint_get_iter_range(&iter->tracepoint,
2812 iter_mod->tracepoints,
2813 iter_mod->tracepoints
2814 + iter_mod->num_tracepoints);
2816 iter->module = iter_mod;
2821 mutex_unlock(&module_mutex);