1 /* Rewritten by Rusty Russell, on the backs of many others...
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/config.h>
20 #include <linux/module.h>
21 #include <linux/moduleloader.h>
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/vmalloc.h>
25 #include <linux/elf.h>
26 #include <linux/seq_file.h>
27 #include <linux/syscalls.h>
28 #include <linux/fcntl.h>
29 #include <linux/rcupdate.h>
30 #include <linux/cpu.h>
31 #include <linux/moduleparam.h>
32 #include <linux/errno.h>
33 #include <linux/err.h>
34 #include <linux/vermagic.h>
35 #include <linux/notifier.h>
36 #include <linux/stop_machine.h>
37 #include <asm/uaccess.h>
38 #include <asm/semaphore.h>
39 #include <asm/cacheflush.h>
44 #define DEBUGP(fmt , a...)
47 #ifndef ARCH_SHF_SMALL
48 #define ARCH_SHF_SMALL 0
51 /* If this is set, the section belongs in the init part of the module */
52 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
54 #define symbol_is(literal, string) \
55 (strcmp(MODULE_SYMBOL_PREFIX literal, (string)) == 0)
57 /* Protects module list */
58 static spinlock_t modlist_lock = SPIN_LOCK_UNLOCKED;
60 /* List of modules, protected by module_mutex AND modlist_lock */
61 static DECLARE_MUTEX(module_mutex);
62 static LIST_HEAD(modules);
64 static DECLARE_MUTEX(notify_mutex);
65 static struct notifier_block * module_notify_list;
67 int register_module_notifier(struct notifier_block * nb)
71 err = notifier_chain_register(&module_notify_list, nb);
75 EXPORT_SYMBOL(register_module_notifier);
77 int unregister_module_notifier(struct notifier_block * nb)
81 err = notifier_chain_unregister(&module_notify_list, nb);
85 EXPORT_SYMBOL(unregister_module_notifier);
87 /* We require a truly strong try_module_get() */
88 static inline int strong_try_module_get(struct module *mod)
90 if (mod && mod->state == MODULE_STATE_COMING)
92 return try_module_get(mod);
95 /* Stub function for modules which don't have an initfn */
100 EXPORT_SYMBOL(init_module);
102 /* A thread that wants to hold a reference to a module only while it
103 * is running can call ths to safely exit.
104 * nfsd and lockd use this.
106 void __module_put_and_exit(struct module *mod, long code)
111 EXPORT_SYMBOL(__module_put_and_exit);
113 /* Find a module section: 0 means not found. */
114 static unsigned int find_sec(Elf_Ehdr *hdr,
116 const char *secstrings,
121 for (i = 1; i < hdr->e_shnum; i++)
122 /* Alloc bit cleared means "ignore it." */
123 if ((sechdrs[i].sh_flags & SHF_ALLOC)
124 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
129 /* Provided by the linker */
130 extern const struct kernel_symbol __start___ksymtab[];
131 extern const struct kernel_symbol __stop___ksymtab[];
132 extern const struct kernel_symbol __start___ksymtab_gpl[];
133 extern const struct kernel_symbol __stop___ksymtab_gpl[];
134 extern const unsigned long __start___kcrctab[];
135 extern const unsigned long __start___kcrctab_gpl[];
137 #ifndef CONFIG_MODVERSIONS
138 #define symversion(base, idx) NULL
140 #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL)
143 /* Find a symbol, return value, crc and module which owns it */
144 static unsigned long __find_symbol(const char *name,
145 struct module **owner,
146 const unsigned long **crc,
152 /* Core kernel first. */
154 for (i = 0; __start___ksymtab+i < __stop___ksymtab; i++) {
155 if (strcmp(__start___ksymtab[i].name, name) == 0) {
156 *crc = symversion(__start___kcrctab, i);
157 return __start___ksymtab[i].value;
161 for (i = 0; __start___ksymtab_gpl+i<__stop___ksymtab_gpl; i++)
162 if (strcmp(__start___ksymtab_gpl[i].name, name) == 0) {
163 *crc = symversion(__start___kcrctab_gpl, i);
164 return __start___ksymtab_gpl[i].value;
168 /* Now try modules. */
169 list_for_each_entry(mod, &modules, list) {
171 for (i = 0; i < mod->num_syms; i++)
172 if (strcmp(mod->syms[i].name, name) == 0) {
173 *crc = symversion(mod->crcs, i);
174 return mod->syms[i].value;
178 for (i = 0; i < mod->num_gpl_syms; i++) {
179 if (strcmp(mod->gpl_syms[i].name, name) == 0) {
180 *crc = symversion(mod->gpl_crcs, i);
181 return mod->gpl_syms[i].value;
186 DEBUGP("Failed to find symbol %s\n", name);
190 /* Find a symbol in this elf symbol table */
191 static unsigned long find_local_symbol(Elf_Shdr *sechdrs,
192 unsigned int symindex,
197 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
199 /* Search (defined) internal symbols first. */
200 for (i = 1; i < sechdrs[symindex].sh_size/sizeof(*sym); i++) {
201 if (sym[i].st_shndx != SHN_UNDEF
202 && strcmp(name, strtab + sym[i].st_name) == 0)
203 return sym[i].st_value;
208 /* Search for module by name: must hold module_mutex. */
209 static struct module *find_module(const char *name)
213 list_for_each_entry(mod, &modules, list) {
214 if (strcmp(mod->name, name) == 0)
221 /* Number of blocks used and allocated. */
222 static unsigned int pcpu_num_used, pcpu_num_allocated;
223 /* Size of each block. -ve means used. */
224 static int *pcpu_size;
226 static int split_block(unsigned int i, unsigned short size)
228 /* Reallocation required? */
229 if (pcpu_num_used + 1 > pcpu_num_allocated) {
230 int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2,
235 memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated);
236 pcpu_num_allocated *= 2;
241 /* Insert a new subblock */
242 memmove(&pcpu_size[i+1], &pcpu_size[i],
243 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
246 pcpu_size[i+1] -= size;
251 static inline unsigned int block_size(int val)
258 /* Created by linker magic */
259 extern char __per_cpu_start[], __per_cpu_end[];
261 static void *percpu_modalloc(unsigned long size, unsigned long align)
267 BUG_ON(align > SMP_CACHE_BYTES);
269 ptr = __per_cpu_start;
270 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
271 /* Extra for alignment requirement. */
272 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
273 BUG_ON(i == 0 && extra != 0);
275 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
278 /* Transfer extra to previous block. */
279 if (pcpu_size[i-1] < 0)
280 pcpu_size[i-1] -= extra;
282 pcpu_size[i-1] += extra;
283 pcpu_size[i] -= extra;
286 /* Split block if warranted */
287 if (pcpu_size[i] - size > sizeof(unsigned long))
288 if (!split_block(i, size))
292 pcpu_size[i] = -pcpu_size[i];
296 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
301 static void percpu_modfree(void *freeme)
304 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
306 /* First entry is core kernel percpu data. */
307 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
309 pcpu_size[i] = -pcpu_size[i];
316 /* Merge with previous? */
317 if (pcpu_size[i-1] >= 0) {
318 pcpu_size[i-1] += pcpu_size[i];
320 memmove(&pcpu_size[i], &pcpu_size[i+1],
321 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
324 /* Merge with next? */
325 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
326 pcpu_size[i] += pcpu_size[i+1];
328 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
329 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
333 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
335 const char *secstrings)
337 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
340 static int percpu_modinit(void)
343 pcpu_num_allocated = 2;
344 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
346 /* Static in-kernel percpu data (used). */
347 pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES);
349 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
350 if (pcpu_size[1] < 0) {
351 printk(KERN_ERR "No per-cpu room for modules.\n");
357 __initcall(percpu_modinit);
358 #else /* ... !CONFIG_SMP */
359 static inline void *percpu_modalloc(unsigned long size, unsigned long align)
363 static inline void percpu_modfree(void *pcpuptr)
367 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
369 const char *secstrings)
373 static inline void percpu_modcopy(void *pcpudst, const void *src,
376 /* pcpusec should be 0, and size of that section should be 0. */
379 #endif /* CONFIG_SMP */
381 static int add_attribute(struct module *mod, struct kernel_param *kp)
383 struct module_attribute *a;
386 a = &mod->mkobj->attr[mod->mkobj->num_attributes];
387 a->attr.name = (char *)kp->name;
389 a->attr.mode = kp->perm;
391 retval = sysfs_create_file(&mod->mkobj->kobj, &a->attr);
393 mod->mkobj->num_attributes++;
397 #ifdef CONFIG_MODULE_UNLOAD
398 /* Init the unload section of the module. */
399 static void module_unload_init(struct module *mod)
403 INIT_LIST_HEAD(&mod->modules_which_use_me);
404 for (i = 0; i < NR_CPUS; i++)
405 local_set(&mod->ref[i].count, 0);
406 /* Hold reference count during initialization. */
407 local_set(&mod->ref[smp_processor_id()].count, 1);
408 /* Backwards compatibility macros put refcount during init. */
409 mod->waiter = current;
412 /* modules using other modules */
415 struct list_head list;
416 struct module *module_which_uses;
419 /* Does a already use b? */
420 static int already_uses(struct module *a, struct module *b)
422 struct module_use *use;
424 list_for_each_entry(use, &b->modules_which_use_me, list) {
425 if (use->module_which_uses == a) {
426 DEBUGP("%s uses %s!\n", a->name, b->name);
430 DEBUGP("%s does not use %s!\n", a->name, b->name);
434 /* Module a uses b */
435 static int use_module(struct module *a, struct module *b)
437 struct module_use *use;
438 if (b == NULL || already_uses(a, b)) return 1;
440 if (!strong_try_module_get(b))
443 DEBUGP("Allocating new usage for %s.\n", a->name);
444 use = kmalloc(sizeof(*use), GFP_ATOMIC);
446 printk("%s: out of memory loading\n", a->name);
451 use->module_which_uses = a;
452 list_add(&use->list, &b->modules_which_use_me);
456 /* Clear the unload stuff of the module. */
457 static void module_unload_free(struct module *mod)
461 list_for_each_entry(i, &modules, list) {
462 struct module_use *use;
464 list_for_each_entry(use, &i->modules_which_use_me, list) {
465 if (use->module_which_uses == mod) {
466 DEBUGP("%s unusing %s\n", mod->name, i->name);
468 list_del(&use->list);
470 /* There can be at most one match. */
477 #ifdef CONFIG_MODULE_FORCE_UNLOAD
478 static inline int try_force(unsigned int flags)
480 int ret = (flags & O_TRUNC);
482 tainted |= TAINT_FORCED_MODULE;
486 static inline int try_force(unsigned int flags)
490 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
499 /* Whole machine is stopped with interrupts off when this runs. */
500 static inline int __try_stop_module(void *_sref)
502 struct stopref *sref = _sref;
504 /* If it's not unused, quit unless we are told to block. */
505 if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
506 if (!(*sref->forced = try_force(sref->flags)))
510 /* Mark it as dying. */
511 sref->mod->state = MODULE_STATE_GOING;
515 static int try_stop_module(struct module *mod, int flags, int *forced)
517 struct stopref sref = { mod, flags, forced };
519 return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
522 unsigned int module_refcount(struct module *mod)
524 unsigned int i, total = 0;
526 for (i = 0; i < NR_CPUS; i++)
527 total += local_read(&mod->ref[i].count);
530 EXPORT_SYMBOL(module_refcount);
532 /* This exists whether we can unload or not */
533 static void free_module(struct module *mod);
535 /* Stub function for modules which don't have an exitfn */
536 void cleanup_module(void)
539 EXPORT_SYMBOL(cleanup_module);
541 static void wait_for_zero_refcount(struct module *mod)
543 /* Since we might sleep for some time, drop the semaphore first */
546 DEBUGP("Looking at refcount...\n");
547 set_current_state(TASK_UNINTERRUPTIBLE);
548 if (module_refcount(mod) == 0)
552 current->state = TASK_RUNNING;
557 sys_delete_module(const char __user *name_user, unsigned int flags)
560 char name[MODULE_NAME_LEN];
563 if (!capable(CAP_SYS_MODULE))
566 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
568 name[MODULE_NAME_LEN-1] = '\0';
570 if (down_interruptible(&module_mutex) != 0)
573 mod = find_module(name);
579 if (!list_empty(&mod->modules_which_use_me)) {
580 /* Other modules depend on us: get rid of them first. */
585 /* Doing init or already dying? */
586 if (mod->state != MODULE_STATE_LIVE) {
587 /* FIXME: if (force), slam module count and wake up
589 DEBUGP("%s already dying\n", mod->name);
594 /* If it has an init func, it must have an exit func to unload */
595 if ((mod->init != init_module && mod->exit == cleanup_module)
597 forced = try_force(flags);
599 /* This module can't be removed */
605 /* Set this up before setting mod->state */
606 mod->waiter = current;
608 /* Stop the machine so refcounts can't move and disable module. */
609 ret = try_stop_module(mod, flags, &forced);
611 /* Never wait if forced. */
612 if (!forced && module_refcount(mod) != 0)
613 wait_for_zero_refcount(mod);
615 /* Final destruction now noone is using it. */
626 static void print_unload_info(struct seq_file *m, struct module *mod)
628 struct module_use *use;
629 int printed_something = 0;
631 seq_printf(m, " %u ", module_refcount(mod));
633 /* Always include a trailing , so userspace can differentiate
634 between this and the old multi-field proc format. */
635 list_for_each_entry(use, &mod->modules_which_use_me, list) {
636 printed_something = 1;
637 seq_printf(m, "%s,", use->module_which_uses->name);
641 printed_something = 1;
642 seq_printf(m, "[unsafe],");
645 if (mod->init != init_module && mod->exit == cleanup_module) {
646 printed_something = 1;
647 seq_printf(m, "[permanent],");
650 if (!printed_something)
654 void __symbol_put(const char *symbol)
656 struct module *owner;
658 const unsigned long *crc;
660 spin_lock_irqsave(&modlist_lock, flags);
661 if (!__find_symbol(symbol, &owner, &crc, 1))
664 spin_unlock_irqrestore(&modlist_lock, flags);
666 EXPORT_SYMBOL(__symbol_put);
668 void symbol_put_addr(void *addr)
672 spin_lock_irqsave(&modlist_lock, flags);
673 if (!kernel_text_address((unsigned long)addr))
676 module_put(module_text_address((unsigned long)addr));
677 spin_unlock_irqrestore(&modlist_lock, flags);
679 EXPORT_SYMBOL_GPL(symbol_put_addr);
681 static int refcnt_get_fn(char *buffer, struct kernel_param *kp)
683 struct module *mod = container_of(kp, struct module, refcnt_param);
685 /* sysfs holds one reference. */
686 return sprintf(buffer, "%u", module_refcount(mod)-1);
689 static inline int sysfs_unload_setup(struct module *mod)
691 mod->refcnt_param.name = "refcnt";
692 mod->refcnt_param.perm = 0444;
693 mod->refcnt_param.get = refcnt_get_fn;
695 return add_attribute(mod, &mod->refcnt_param);
698 #else /* !CONFIG_MODULE_UNLOAD */
699 static void print_unload_info(struct seq_file *m, struct module *mod)
701 /* We don't know the usage count, or what modules are using. */
702 seq_printf(m, " - -");
705 static inline void module_unload_free(struct module *mod)
709 static inline int use_module(struct module *a, struct module *b)
711 return strong_try_module_get(b);
714 static inline void module_unload_init(struct module *mod)
719 sys_delete_module(const char __user *name_user, unsigned int flags)
724 static inline int sysfs_unload_setup(struct module *mod)
728 #endif /* CONFIG_MODULE_UNLOAD */
730 #ifdef CONFIG_OBSOLETE_MODPARM
731 static int param_set_byte(const char *val, struct kernel_param *kp)
736 if (!val) return -EINVAL;
737 l = simple_strtol(val, &endp, 0);
738 if (endp == val || *endp || ((char)l != l))
740 *((char *)kp->arg) = l;
744 /* Bounds checking done below */
745 static int obsparm_copy_string(const char *val, struct kernel_param *kp)
747 strcpy(kp->arg, val);
751 int set_obsolete(const char *val, struct kernel_param *kp)
753 unsigned int min, max;
754 unsigned int size, maxsize;
758 struct obsolete_modparm *obsparm = kp->arg;
761 printk(KERN_ERR "Parameter %s needs an argument\n", kp->name);
765 /* type is: [min[-max]]{b,h,i,l,s} */
767 min = simple_strtol(p, &endp, 10);
768 if (endp == obsparm->type)
770 else if (*endp == '-') {
772 max = simple_strtol(p, &endp, 10);
777 return param_array(kp->name, val, min, max, obsparm->addr,
778 1, param_set_byte, &dummy);
780 return param_array(kp->name, val, min, max, obsparm->addr,
781 sizeof(short), param_set_short, &dummy);
783 return param_array(kp->name, val, min, max, obsparm->addr,
784 sizeof(int), param_set_int, &dummy);
786 return param_array(kp->name, val, min, max, obsparm->addr,
787 sizeof(long), param_set_long, &dummy);
789 return param_array(kp->name, val, min, max, obsparm->addr,
790 sizeof(char *), param_set_charp, &dummy);
793 /* Undocumented: 1-5c50 means 1-5 strings of up to 49 chars,
794 and the decl is "char xxx[5][50];" */
796 maxsize = simple_strtol(p, &endp, 10);
797 /* We check lengths here (yes, this is a hack). */
799 while (p[size = strcspn(p, ",")]) {
806 return param_array(kp->name, val, min, max, obsparm->addr,
807 maxsize, obsparm_copy_string, &dummy);
809 printk(KERN_ERR "Unknown obsolete parameter type %s\n", obsparm->type);
813 "Parameter %s doesn't fit in %u chars.\n", kp->name, maxsize);
817 static int obsolete_params(const char *name,
819 struct obsolete_modparm obsparm[],
822 unsigned int symindex,
825 struct kernel_param *kp;
829 kp = kmalloc(sizeof(kp[0]) * num, GFP_KERNEL);
833 for (i = 0; i < num; i++) {
834 char sym_name[128 + sizeof(MODULE_SYMBOL_PREFIX)];
836 snprintf(sym_name, sizeof(sym_name), "%s%s",
837 MODULE_SYMBOL_PREFIX, obsparm[i].name);
839 kp[i].name = obsparm[i].name;
841 kp[i].set = set_obsolete;
844 = (void *)find_local_symbol(sechdrs, symindex, strtab,
846 if (!obsparm[i].addr) {
847 printk("%s: falsely claims to have parameter %s\n",
848 name, obsparm[i].name);
852 kp[i].arg = &obsparm[i];
855 ret = parse_args(name, args, kp, num, NULL);
861 static int obsolete_params(const char *name,
863 struct obsolete_modparm obsparm[],
866 unsigned int symindex,
870 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
874 #endif /* CONFIG_OBSOLETE_MODPARM */
876 static const char vermagic[] = VERMAGIC_STRING;
878 #ifdef CONFIG_MODVERSIONS
879 static int check_version(Elf_Shdr *sechdrs,
880 unsigned int versindex,
883 const unsigned long *crc)
885 unsigned int i, num_versions;
886 struct modversion_info *versions;
888 /* Exporting module didn't supply crcs? OK, we're already tainted. */
892 versions = (void *) sechdrs[versindex].sh_addr;
893 num_versions = sechdrs[versindex].sh_size
894 / sizeof(struct modversion_info);
896 for (i = 0; i < num_versions; i++) {
897 if (strcmp(versions[i].name, symname) != 0)
900 if (versions[i].crc == *crc)
902 printk("%s: disagrees about version of symbol %s\n",
904 DEBUGP("Found checksum %lX vs module %lX\n",
905 *crc, versions[i].crc);
908 /* Not in module's version table. OK, but that taints the kernel. */
909 if (!(tainted & TAINT_FORCED_MODULE)) {
910 printk("%s: no version for \"%s\" found: kernel tainted.\n",
912 tainted |= TAINT_FORCED_MODULE;
917 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
918 unsigned int versindex,
921 const unsigned long *crc;
922 struct module *owner;
924 if (!__find_symbol("struct_module", &owner, &crc, 1))
926 return check_version(sechdrs, versindex, "struct_module", mod,
930 /* First part is kernel version, which we ignore. */
931 static inline int same_magic(const char *amagic, const char *bmagic)
933 amagic += strcspn(amagic, " ");
934 bmagic += strcspn(bmagic, " ");
935 return strcmp(amagic, bmagic) == 0;
938 static inline int check_version(Elf_Shdr *sechdrs,
939 unsigned int versindex,
942 const unsigned long *crc)
947 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
948 unsigned int versindex,
954 static inline int same_magic(const char *amagic, const char *bmagic)
956 return strcmp(amagic, bmagic) == 0;
958 #endif /* CONFIG_MODVERSIONS */
960 /* Resolve a symbol for this module. I.e. if we find one, record usage.
961 Must be holding module_mutex. */
962 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
963 unsigned int versindex,
967 struct module *owner;
969 const unsigned long *crc;
971 spin_lock_irq(&modlist_lock);
972 ret = __find_symbol(name, &owner, &crc, mod->license_gplok);
974 /* use_module can fail due to OOM, or module unloading */
975 if (!check_version(sechdrs, versindex, name, mod, crc) ||
976 !use_module(mod, owner))
979 spin_unlock_irq(&modlist_lock);
983 #define to_module_attr(n) container_of(n, struct module_attribute, attr);
985 static ssize_t module_attr_show(struct kobject *kobj,
986 struct attribute *attr,
990 struct module_attribute *attribute = to_module_attr(attr);
992 if (!attribute->param->get)
995 count = attribute->param->get(buf, attribute->param);
1003 /* sysfs always hands a nul-terminated string in buf. We rely on that. */
1004 static ssize_t module_attr_store(struct kobject *kobj,
1005 struct attribute *attr,
1006 const char *buf, size_t len)
1009 struct module_attribute *attribute = to_module_attr(attr);
1011 if (!attribute->param->set)
1014 err = attribute->param->set(buf, attribute->param);
1020 static struct sysfs_ops module_sysfs_ops = {
1021 .show = module_attr_show,
1022 .store = module_attr_store,
1025 static void module_kobj_release(struct kobject *kobj)
1027 kfree(container_of(kobj, struct module_kobject, kobj));
1030 static struct kobj_type module_ktype = {
1031 .sysfs_ops = &module_sysfs_ops,
1032 .release = &module_kobj_release,
1034 static decl_subsys(module, &module_ktype, NULL);
1036 static int mod_sysfs_setup(struct module *mod,
1037 struct kernel_param *kparam,
1038 unsigned int num_params)
1043 /* We overallocate: not every param is in sysfs, and maybe no refcnt */
1044 mod->mkobj = kmalloc(sizeof(*mod->mkobj)
1045 + sizeof(mod->mkobj->attr[0]) * (num_params+1),
1050 memset(&mod->mkobj->kobj, 0, sizeof(mod->mkobj->kobj));
1051 err = kobject_set_name(&mod->mkobj->kobj, mod->name);
1054 kobj_set_kset_s(mod->mkobj, module_subsys);
1055 err = kobject_register(&mod->mkobj->kobj);
1059 mod->mkobj->num_attributes = 0;
1061 for (i = 0; i < num_params; i++) {
1062 if (kparam[i].perm) {
1063 err = add_attribute(mod, &kparam[i]);
1068 err = sysfs_unload_setup(mod);
1074 for (i = 0; i < mod->mkobj->num_attributes; i++)
1075 sysfs_remove_file(&mod->mkobj->kobj,&mod->mkobj->attr[i].attr);
1076 /* Calls module_kobj_release */
1077 kobject_unregister(&mod->mkobj->kobj);
1084 static void mod_kobject_remove(struct module *mod)
1087 for (i = 0; i < mod->mkobj->num_attributes; i++)
1088 sysfs_remove_file(&mod->mkobj->kobj,&mod->mkobj->attr[i].attr);
1089 /* Calls module_kobj_release */
1090 kobject_unregister(&mod->mkobj->kobj);
1093 /* Free a module, remove from lists, etc (must hold module mutex). */
1094 static void free_module(struct module *mod)
1096 /* Delete from various lists */
1097 spin_lock_irq(&modlist_lock);
1098 list_del(&mod->list);
1099 spin_unlock_irq(&modlist_lock);
1101 mod_kobject_remove(mod);
1103 /* Arch-specific cleanup. */
1104 module_arch_cleanup(mod);
1106 /* Module unload stuff */
1107 module_unload_free(mod);
1109 /* This may be NULL, but that's OK */
1110 module_free(mod, mod->module_init);
1113 percpu_modfree(mod->percpu);
1115 /* Finally, free the core (containing the module structure) */
1116 module_free(mod, mod->module_core);
1119 void *__symbol_get(const char *symbol)
1121 struct module *owner;
1122 unsigned long value, flags;
1123 const unsigned long *crc;
1125 spin_lock_irqsave(&modlist_lock, flags);
1126 value = __find_symbol(symbol, &owner, &crc, 1);
1127 if (value && !strong_try_module_get(owner))
1129 spin_unlock_irqrestore(&modlist_lock, flags);
1131 return (void *)value;
1133 EXPORT_SYMBOL_GPL(__symbol_get);
1135 /* Change all symbols so that sh_value encodes the pointer directly. */
1136 static int simplify_symbols(Elf_Shdr *sechdrs,
1137 unsigned int symindex,
1139 unsigned int versindex,
1140 unsigned int pcpuindex,
1143 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1144 unsigned long secbase;
1145 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1148 for (i = 1; i < n; i++) {
1149 switch (sym[i].st_shndx) {
1151 /* We compiled with -fno-common. These are not
1152 supposed to happen. */
1153 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1154 printk("%s: please compile with -fno-common\n",
1160 /* Don't need to do anything */
1161 DEBUGP("Absolute symbol: 0x%08lx\n",
1162 (long)sym[i].st_value);
1167 = resolve_symbol(sechdrs, versindex,
1168 strtab + sym[i].st_name, mod);
1170 /* Ok if resolved. */
1171 if (sym[i].st_value != 0)
1174 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1177 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1178 mod->name, strtab + sym[i].st_name);
1183 /* Divert to percpu allocation if a percpu var. */
1184 if (sym[i].st_shndx == pcpuindex)
1185 secbase = (unsigned long)mod->percpu;
1187 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1188 sym[i].st_value += secbase;
1196 /* Update size with this section: return offset. */
1197 static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
1201 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1202 *size = ret + sechdr->sh_size;
1206 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1207 might -- code, read-only data, read-write data, small data. Tally
1208 sizes, and place the offsets into sh_entsize fields: high bit means it
1210 static void layout_sections(struct module *mod,
1211 const Elf_Ehdr *hdr,
1213 const char *secstrings)
1215 static unsigned long const masks[][2] = {
1216 /* NOTE: all executable code must be the first section
1217 * in this array; otherwise modify the text_size
1218 * finder in the two loops below */
1219 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1220 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1221 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1222 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1226 for (i = 0; i < hdr->e_shnum; i++)
1227 sechdrs[i].sh_entsize = ~0UL;
1229 DEBUGP("Core section allocation order:\n");
1230 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1231 for (i = 0; i < hdr->e_shnum; ++i) {
1232 Elf_Shdr *s = &sechdrs[i];
1234 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1235 || (s->sh_flags & masks[m][1])
1236 || s->sh_entsize != ~0UL
1237 || strncmp(secstrings + s->sh_name,
1240 s->sh_entsize = get_offset(&mod->core_size, s);
1241 DEBUGP("\t%s\n", secstrings + s->sh_name);
1244 mod->core_text_size = mod->core_size;
1247 DEBUGP("Init section allocation order:\n");
1248 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1249 for (i = 0; i < hdr->e_shnum; ++i) {
1250 Elf_Shdr *s = &sechdrs[i];
1252 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1253 || (s->sh_flags & masks[m][1])
1254 || s->sh_entsize != ~0UL
1255 || strncmp(secstrings + s->sh_name,
1258 s->sh_entsize = (get_offset(&mod->init_size, s)
1259 | INIT_OFFSET_MASK);
1260 DEBUGP("\t%s\n", secstrings + s->sh_name);
1263 mod->init_text_size = mod->init_size;
1267 static inline int license_is_gpl_compatible(const char *license)
1269 return (strcmp(license, "GPL") == 0
1270 || strcmp(license, "GPL v2") == 0
1271 || strcmp(license, "GPL and additional rights") == 0
1272 || strcmp(license, "Dual BSD/GPL") == 0
1273 || strcmp(license, "Dual MPL/GPL") == 0);
1276 static void set_license(struct module *mod, const char *license)
1279 license = "unspecified";
1281 mod->license_gplok = license_is_gpl_compatible(license);
1282 if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) {
1283 printk(KERN_WARNING "%s: module license '%s' taints kernel.\n",
1284 mod->name, license);
1285 tainted |= TAINT_PROPRIETARY_MODULE;
1289 /* Parse tag=value strings from .modinfo section */
1290 static char *next_string(char *string, unsigned long *secsize)
1292 /* Skip non-zero chars */
1295 if ((*secsize)-- <= 1)
1299 /* Skip any zero padding. */
1300 while (!string[0]) {
1302 if ((*secsize)-- <= 1)
1308 static char *get_modinfo(Elf_Shdr *sechdrs,
1313 unsigned int taglen = strlen(tag);
1314 unsigned long size = sechdrs[info].sh_size;
1316 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1317 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1318 return p + taglen + 1;
1323 #ifdef CONFIG_KALLSYMS
1324 int is_exported(const char *name, const struct module *mod)
1329 for (i = 0; __start___ksymtab+i < __stop___ksymtab; i++)
1330 if (strcmp(__start___ksymtab[i].name, name) == 0)
1334 for (i = 0; i < mod->num_syms; i++)
1335 if (strcmp(mod->syms[i].name, name) == 0)
1341 static char elf_type(const Elf_Sym *sym,
1343 const char *secstrings,
1346 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1347 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1352 if (sym->st_shndx == SHN_UNDEF)
1354 if (sym->st_shndx == SHN_ABS)
1356 if (sym->st_shndx >= SHN_LORESERVE)
1358 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1360 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1361 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1362 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1364 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1369 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1370 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1375 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1376 ".debug", strlen(".debug")) == 0)
1381 static void add_kallsyms(struct module *mod,
1383 unsigned int symindex,
1384 unsigned int strindex,
1385 const char *secstrings)
1389 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1390 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1391 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1393 /* Set types up while we still have access to sections. */
1394 for (i = 0; i < mod->num_symtab; i++)
1395 mod->symtab[i].st_info
1396 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1399 static inline void add_kallsyms(struct module *mod,
1401 unsigned int symindex,
1402 unsigned int strindex,
1403 const char *secstrings)
1406 #endif /* CONFIG_KALLSYMS */
1408 /* Allocate and load the module: note that size of section 0 is always
1409 zero, and we rely on this for optional sections. */
1410 static struct module *load_module(void __user *umod,
1412 const char __user *uargs)
1416 char *secstrings, *args, *modmagic, *strtab = NULL;
1417 unsigned int i, symindex = 0, strindex = 0, setupindex, exindex,
1418 exportindex, modindex, obsparmindex, infoindex, gplindex,
1419 crcindex, gplcrcindex, versindex, pcpuindex;
1423 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1424 struct exception_table_entry *extable;
1426 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1428 if (len < sizeof(*hdr))
1429 return ERR_PTR(-ENOEXEC);
1431 /* Suck in entire file: we'll want most of it. */
1432 /* vmalloc barfs on "unusual" numbers. Check here */
1433 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1434 return ERR_PTR(-ENOMEM);
1435 if (copy_from_user(hdr, umod, len) != 0) {
1440 /* Sanity checks against insmoding binaries or wrong arch,
1441 weird elf version */
1442 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
1443 || hdr->e_type != ET_REL
1444 || !elf_check_arch(hdr)
1445 || hdr->e_shentsize != sizeof(*sechdrs)) {
1450 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1453 /* Convenience variables */
1454 sechdrs = (void *)hdr + hdr->e_shoff;
1455 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1456 sechdrs[0].sh_addr = 0;
1458 /* And these should exist, but gcc whinges if we don't init them */
1459 symindex = strindex = 0;
1461 for (i = 1; i < hdr->e_shnum; i++) {
1462 if (sechdrs[i].sh_type != SHT_NOBITS
1463 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1466 /* Mark all sections sh_addr with their address in the
1468 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1470 /* Internal symbols and strings. */
1471 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1473 strindex = sechdrs[i].sh_link;
1474 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1476 #ifndef CONFIG_MODULE_UNLOAD
1477 /* Don't load .exit sections */
1478 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1479 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1483 modindex = find_sec(hdr, sechdrs, secstrings,
1484 ".gnu.linkonce.this_module");
1486 printk(KERN_WARNING "No module found in object\n");
1490 mod = (void *)sechdrs[modindex].sh_addr;
1492 /* Optional sections */
1493 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1494 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1495 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1496 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1497 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1498 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1499 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1500 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1501 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1502 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1504 /* Don't keep modinfo section */
1505 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1506 #ifdef CONFIG_KALLSYMS
1507 /* Keep symbol and string tables for decoding later. */
1508 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1509 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1512 /* Check module struct version now, before we try to use module. */
1513 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1518 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1519 /* This is allowed: modprobe --force will invalidate it. */
1521 tainted |= TAINT_FORCED_MODULE;
1522 printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
1524 } else if (!same_magic(modmagic, vermagic)) {
1525 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1526 mod->name, modmagic, vermagic);
1531 /* Now copy in args */
1532 arglen = strlen_user(uargs);
1537 args = kmalloc(arglen, GFP_KERNEL);
1542 if (copy_from_user(args, uargs, arglen) != 0) {
1547 if (find_module(mod->name)) {
1552 mod->state = MODULE_STATE_COMING;
1554 /* Allow arches to frob section contents and sizes. */
1555 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1560 /* We have a special allocation for this section. */
1561 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1562 sechdrs[pcpuindex].sh_addralign);
1567 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1568 mod->percpu = percpu;
1571 /* Determine total sizes, and put offsets in sh_entsize. For now
1572 this is done generically; there doesn't appear to be any
1573 special cases for the architectures. */
1574 layout_sections(mod, hdr, sechdrs, secstrings);
1576 /* Do the allocs. */
1577 ptr = module_alloc(mod->core_size);
1582 memset(ptr, 0, mod->core_size);
1583 mod->module_core = ptr;
1585 ptr = module_alloc(mod->init_size);
1586 if (!ptr && mod->init_size) {
1590 memset(ptr, 0, mod->init_size);
1591 mod->module_init = ptr;
1593 /* Transfer each section which specifies SHF_ALLOC */
1594 DEBUGP("final section addresses:\n");
1595 for (i = 0; i < hdr->e_shnum; i++) {
1598 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1601 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
1602 dest = mod->module_init
1603 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
1605 dest = mod->module_core + sechdrs[i].sh_entsize;
1607 if (sechdrs[i].sh_type != SHT_NOBITS)
1608 memcpy(dest, (void *)sechdrs[i].sh_addr,
1609 sechdrs[i].sh_size);
1610 /* Update sh_addr to point to copy in image. */
1611 sechdrs[i].sh_addr = (unsigned long)dest;
1612 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
1614 /* Module has been moved. */
1615 mod = (void *)sechdrs[modindex].sh_addr;
1617 /* Now we've moved module, initialize linked lists, etc. */
1618 module_unload_init(mod);
1620 /* Set up license info based on the info section */
1621 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
1623 /* Fix up syms, so that st_value is a pointer to location. */
1624 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
1629 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
1630 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
1631 mod->syms = (void *)sechdrs[exportindex].sh_addr;
1633 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
1634 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
1635 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
1637 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
1639 #ifdef CONFIG_MODVERSIONS
1640 if ((mod->num_syms && !crcindex) ||
1641 (mod->num_gpl_syms && !gplcrcindex)) {
1642 printk(KERN_WARNING "%s: No versions for exported symbols."
1643 " Tainting kernel.\n", mod->name);
1644 tainted |= TAINT_FORCED_MODULE;
1648 /* Now do relocations. */
1649 for (i = 1; i < hdr->e_shnum; i++) {
1650 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1651 unsigned int info = sechdrs[i].sh_info;
1653 /* Not a valid relocation section? */
1654 if (info >= hdr->e_shnum)
1657 /* Don't bother with non-allocated sections */
1658 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
1661 if (sechdrs[i].sh_type == SHT_REL)
1662 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
1663 else if (sechdrs[i].sh_type == SHT_RELA)
1664 err = apply_relocate_add(sechdrs, strtab, symindex, i,
1670 /* Set up and sort exception table */
1671 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
1672 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
1673 sort_extable(extable, extable + mod->num_exentries);
1675 /* Finally, copy percpu area over. */
1676 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
1677 sechdrs[pcpuindex].sh_size);
1679 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
1681 err = module_finalize(hdr, sechdrs, mod);
1687 err = obsolete_params(mod->name, mod->args,
1688 (struct obsolete_modparm *)
1689 sechdrs[obsparmindex].sh_addr,
1690 sechdrs[obsparmindex].sh_size
1691 / sizeof(struct obsolete_modparm),
1693 (char *)sechdrs[strindex].sh_addr);
1695 printk(KERN_WARNING "%s: Ignoring new-style "
1696 "parameters in presence of obsolete ones\n",
1699 /* Size of section 0 is 0, so this works well if no params */
1700 err = parse_args(mod->name, mod->args,
1701 (struct kernel_param *)
1702 sechdrs[setupindex].sh_addr,
1703 sechdrs[setupindex].sh_size
1704 / sizeof(struct kernel_param),
1707 err = mod_sysfs_setup(mod,
1708 (struct kernel_param *)
1709 sechdrs[setupindex].sh_addr,
1710 sechdrs[setupindex].sh_size
1711 / sizeof(struct kernel_param));
1715 /* Get rid of temporary copy */
1722 module_arch_cleanup(mod);
1724 module_unload_free(mod);
1725 module_free(mod, mod->module_init);
1727 module_free(mod, mod->module_core);
1730 percpu_modfree(percpu);
1735 if (err < 0) return ERR_PTR(err);
1739 printk(KERN_ERR "Module len %lu truncated\n", len);
1744 /* This is where the real work happens */
1746 sys_init_module(void __user *umod,
1748 const char __user *uargs)
1753 /* Must have permission */
1754 if (!capable(CAP_SYS_MODULE))
1757 /* Only one module load at a time, please */
1758 if (down_interruptible(&module_mutex) != 0)
1761 /* Do all the hard work */
1762 mod = load_module(umod, len, uargs);
1765 return PTR_ERR(mod);
1768 /* Flush the instruction cache, since we've played with text */
1769 if (mod->module_init)
1770 flush_icache_range((unsigned long)mod->module_init,
1771 (unsigned long)mod->module_init
1773 flush_icache_range((unsigned long)mod->module_core,
1774 (unsigned long)mod->module_core + mod->core_size);
1776 /* Now sew it into the lists. They won't access us, since
1777 strong_try_module_get() will fail. */
1778 spin_lock_irq(&modlist_lock);
1779 list_add(&mod->list, &modules);
1780 spin_unlock_irq(&modlist_lock);
1782 /* Drop lock so they can recurse */
1785 down(¬ify_mutex);
1786 notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod);
1789 /* Start the module */
1792 /* Init routine failed: abort. Try to protect us from
1793 buggy refcounters. */
1794 mod->state = MODULE_STATE_GOING;
1795 synchronize_kernel();
1797 printk(KERN_ERR "%s: module is now stuck!\n",
1801 down(&module_mutex);
1808 /* Now it's a first class citizen! */
1809 down(&module_mutex);
1810 mod->state = MODULE_STATE_LIVE;
1811 /* Drop initial reference. */
1813 module_free(mod, mod->module_init);
1814 mod->module_init = NULL;
1816 mod->init_text_size = 0;
1822 static inline int within(unsigned long addr, void *start, unsigned long size)
1824 return ((void *)addr >= start && (void *)addr < start + size);
1827 #ifdef CONFIG_KALLSYMS
1828 static const char *get_ksymbol(struct module *mod,
1830 unsigned long *size,
1831 unsigned long *offset)
1833 unsigned int i, best = 0;
1834 unsigned long nextval;
1836 /* At worse, next value is at end of module */
1837 if (within(addr, mod->module_init, mod->init_size))
1838 nextval = (unsigned long)mod->module_init+mod->init_text_size;
1840 nextval = (unsigned long)mod->module_core+mod->core_text_size;
1842 /* Scan for closest preceeding symbol, and next symbol. (ELF
1843 starts real symbols at 1). */
1844 for (i = 1; i < mod->num_symtab; i++) {
1845 if (mod->symtab[i].st_shndx == SHN_UNDEF)
1848 /* We ignore unnamed symbols: they're uninformative
1849 * and inserted at a whim. */
1850 if (mod->symtab[i].st_value <= addr
1851 && mod->symtab[i].st_value > mod->symtab[best].st_value
1852 && *(mod->strtab + mod->symtab[i].st_name) != '\0' )
1854 if (mod->symtab[i].st_value > addr
1855 && mod->symtab[i].st_value < nextval
1856 && *(mod->strtab + mod->symtab[i].st_name) != '\0')
1857 nextval = mod->symtab[i].st_value;
1863 *size = nextval - mod->symtab[best].st_value;
1864 *offset = addr - mod->symtab[best].st_value;
1865 return mod->strtab + mod->symtab[best].st_name;
1868 /* For kallsyms to ask for address resolution. NULL means not found.
1869 We don't lock, as this is used for oops resolution and races are a
1871 const char *module_address_lookup(unsigned long addr,
1872 unsigned long *size,
1873 unsigned long *offset,
1878 list_for_each_entry(mod, &modules, list) {
1879 if (within(addr, mod->module_init, mod->init_size)
1880 || within(addr, mod->module_core, mod->core_size)) {
1881 *modname = mod->name;
1882 return get_ksymbol(mod, addr, size, offset);
1888 struct module *module_get_kallsym(unsigned int symnum,
1889 unsigned long *value,
1895 down(&module_mutex);
1896 list_for_each_entry(mod, &modules, list) {
1897 if (symnum < mod->num_symtab) {
1898 *value = mod->symtab[symnum].st_value;
1899 *type = mod->symtab[symnum].st_info;
1901 mod->strtab + mod->symtab[symnum].st_name,
1906 symnum -= mod->num_symtab;
1912 static unsigned long mod_find_symname(struct module *mod, const char *name)
1916 for (i = 0; i < mod->num_symtab; i++)
1917 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0)
1918 return mod->symtab[i].st_value;
1922 /* Look for this name: can be of form module:name. */
1923 unsigned long module_kallsyms_lookup_name(const char *name)
1927 unsigned long ret = 0;
1929 /* Don't lock: we're in enough trouble already. */
1930 if ((colon = strchr(name, ':')) != NULL) {
1932 if ((mod = find_module(name)) != NULL)
1933 ret = mod_find_symname(mod, colon+1);
1936 list_for_each_entry(mod, &modules, list)
1937 if ((ret = mod_find_symname(mod, name)) != 0)
1942 #endif /* CONFIG_KALLSYMS */
1944 /* Called by the /proc file system to return a list of modules. */
1945 static void *m_start(struct seq_file *m, loff_t *pos)
1947 struct list_head *i;
1950 down(&module_mutex);
1951 list_for_each(i, &modules) {
1960 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
1962 struct list_head *i = p;
1964 if (i->next == &modules)
1969 static void m_stop(struct seq_file *m, void *p)
1974 static int m_show(struct seq_file *m, void *p)
1976 struct module *mod = list_entry(p, struct module, list);
1977 seq_printf(m, "%s %lu",
1978 mod->name, mod->init_size + mod->core_size);
1979 print_unload_info(m, mod);
1981 /* Informative for users. */
1982 seq_printf(m, " %s",
1983 mod->state == MODULE_STATE_GOING ? "Unloading":
1984 mod->state == MODULE_STATE_COMING ? "Loading":
1986 /* Used by oprofile and other similar tools. */
1987 seq_printf(m, " 0x%p", mod->module_core);
1989 seq_printf(m, "\n");
1993 /* Format: modulename size refcount deps address
1995 Where refcount is a number or -, and deps is a comma-separated list
1998 struct seq_operations modules_op = {
2005 /* Given an address, look for it in the module exception tables. */
2006 const struct exception_table_entry *search_module_extables(unsigned long addr)
2008 unsigned long flags;
2009 const struct exception_table_entry *e = NULL;
2012 spin_lock_irqsave(&modlist_lock, flags);
2013 list_for_each_entry(mod, &modules, list) {
2014 if (mod->num_exentries == 0)
2017 e = search_extable(mod->extable,
2018 mod->extable + mod->num_exentries - 1,
2023 spin_unlock_irqrestore(&modlist_lock, flags);
2025 /* Now, if we found one, we are running inside it now, hence
2026 we cannot unload the module, hence no refcnt needed. */
2030 /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
2031 struct module *module_text_address(unsigned long addr)
2035 list_for_each_entry(mod, &modules, list)
2036 if (within(addr, mod->module_init, mod->init_text_size)
2037 || within(addr, mod->module_core, mod->core_text_size))
2042 /* Don't grab lock, we're oopsing. */
2043 void print_modules(void)
2047 printk("Modules linked in:");
2048 list_for_each_entry(mod, &modules, list)
2049 printk(" %s", mod->name);
2053 #ifdef CONFIG_MODVERSIONS
2054 /* Generate the signature for struct module here, too, for modversions. */
2055 void struct_module(struct module *mod) { return; }
2056 EXPORT_SYMBOL(struct_module);
2059 static int __init modules_init(void)
2061 return subsystem_register(&module_subsys);
2063 __initcall(modules_init);